net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2013 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/crc32c.h>
  31
  32 /* hash class keys */
  33 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  34 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  35
  36 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
  37                                  unsigned short vid,
  38                                  struct batadv_orig_node *orig_node);
  39 static void batadv_tt_purge(struct work_struct *work);
  40 static void
  41 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  42 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  43                                  struct batadv_orig_node *orig_node,
  44                                  const unsigned char *addr,
  45                                  unsigned short vid, const char *message,
  46                                  bool roaming);
  47
  48 /* returns 1 if they are the same mac addr */
  49 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  50 {
  51         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  52                                          hash_entry);
  53
  54         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
  55 }
  56
  57 /**
  58  * batadv_choose_tt - return the index of the tt entry in the hash table
  59  * @data: pointer to the tt_common_entry object to map
  60  * @size: the size of the hash table
  61  *
  62  * Returns the hash index where the object represented by 'data' should be
  63  * stored at.
  64  */
  65 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
  66 {
  67         struct batadv_tt_common_entry *tt;
  68         uint32_t hash = 0;
  69
  70         tt = (struct batadv_tt_common_entry *)data;
  71         hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
  72         hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
  73
  74         hash += (hash << 3);
  75         hash ^= (hash >> 11);
  76         hash += (hash << 15);
  77
  78         return hash % size;
  79 }
  80
  81 /**
  82  * batadv_tt_hash_find - look for a client in the given hash table
  83  * @hash: the hash table to search
  84  * @addr: the mac address of the client to look for
  85  * @vid: VLAN identifier
  86  *
  87  * Returns a pointer to the tt_common struct belonging to the searched client if
  88  * found, NULL otherwise.
  89  */
  90 static struct batadv_tt_common_entry *
  91 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
  92                     unsigned short vid)
  93 {
  94         struct hlist_head *head;
  95         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
  96         uint32_t index;
  97
  98         if (!hash)
  99                 return NULL;
 100
 101         memcpy(to_search.addr, addr, ETH_ALEN);
 102         to_search.vid = vid;
 103
 104         index = batadv_choose_tt(&to_search, hash->size);
 105         head = &hash->table[index];
 106
 107         rcu_read_lock();
 108         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 109                 if (!batadv_compare_eth(tt, addr))
 110                         continue;
 111
 112                 if (tt->vid != vid)
 113                         continue;
 114
 115                 if (!atomic_inc_not_zero(&tt->refcount))
 116                         continue;
 117
 118                 tt_tmp = tt;
 119                 break;
 120         }
 121         rcu_read_unlock();
 122
 123         return tt_tmp;
 124 }
 125
 126 /**
 127  * batadv_tt_local_hash_find - search the local table for a given client
 128  * @bat_priv: the bat priv with all the soft interface information
 129  * @addr: the mac address of the client to look for
 130  * @vid: VLAN identifier
 131  *
 132  * Returns a pointer to the corresponding tt_local_entry struct if the client is
 133  * found, NULL otherwise.
 134  */
 135 static struct batadv_tt_local_entry *
 136 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 137                           unsigned short vid)
 138 {
 139         struct batadv_tt_common_entry *tt_common_entry;
 140         struct batadv_tt_local_entry *tt_local_entry = NULL;
 141
 142         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 143                                               vid);
 144         if (tt_common_entry)
 145                 tt_local_entry = container_of(tt_common_entry,
 146                                               struct batadv_tt_local_entry,
 147                                               common);
 148         return tt_local_entry;
 149 }
 150
 151 /**
 152  * batadv_tt_global_hash_find - search the global table for a given client
 153  * @bat_priv: the bat priv with all the soft interface information
 154  * @addr: the mac address of the client to look for
 155  * @vid: VLAN identifier
 156  *
 157  * Returns a pointer to the corresponding tt_global_entry struct if the client
 158  * is found, NULL otherwise.
 159  */
 160 static struct batadv_tt_global_entry *
 161 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 162                            unsigned short vid)
 163 {
 164         struct batadv_tt_common_entry *tt_common_entry;
 165         struct batadv_tt_global_entry *tt_global_entry = NULL;
 166
 167         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 168                                               vid);
 169         if (tt_common_entry)
 170                 tt_global_entry = container_of(tt_common_entry,
 171                                                struct batadv_tt_global_entry,
 172                                                common);
 173         return tt_global_entry;
 174 }
 175
 176 static void
 177 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 178 {
 179         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 180                 kfree_rcu(tt_local_entry, common.rcu);
 181 }
 182
 183 /**
 184  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
 185  *  tt_global_entry and possibly free it
 186  * @tt_global_entry: the object to free
 187  */
 188 static void
 189 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 190 {
 191         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 192                 batadv_tt_global_del_orig_list(tt_global_entry);
 193                 kfree_rcu(tt_global_entry, common.rcu);
 194         }
 195 }
 196
 197 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 198 {
 199         struct batadv_tt_orig_list_entry *orig_entry;
 200
 201         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 202
 203         /* We are in an rcu callback here, therefore we cannot use
 204          * batadv_orig_node_free_ref() and its call_rcu():
 205          * An rcu_barrier() wouldn't wait for that to finish
 206          */
 207         batadv_orig_node_free_ref_now(orig_entry->orig_node);
 208         kfree(orig_entry);
 209 }
 210
 211 /**
 212  * batadv_tt_local_size_mod - change the size by v of the local table identified
 213  *  by vid
 214  * @bat_priv: the bat priv with all the soft interface information
 215  * @vid: the VLAN identifier of the sub-table to change
 216  * @v: the amount to sum to the local table size
 217  */
 218 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 219                                      unsigned short vid, int v)
 220 {
 221         struct batadv_softif_vlan *vlan;
 222
 223         vlan = batadv_softif_vlan_get(bat_priv, vid);
 224         if (!vlan)
 225                 return;
 226
 227         atomic_add(v, &vlan->tt.num_entries);
 228
 229         batadv_softif_vlan_free_ref(vlan);
 230 }
 231
 232 /**
 233  * batadv_tt_local_size_inc - increase by one the local table size for the given
 234  *  vid
 235  * @bat_priv: the bat priv with all the soft interface information
 236  * @vid: the VLAN identifier
 237  */
 238 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 239                                      unsigned short vid)
 240 {
 241         batadv_tt_local_size_mod(bat_priv, vid, 1);
 242 }
 243
 244 /**
 245  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 246  *  vid
 247  * @bat_priv: the bat priv with all the soft interface information
 248  * @vid: the VLAN identifier
 249  */
 250 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 251                                      unsigned short vid)
 252 {
 253         batadv_tt_local_size_mod(bat_priv, vid, -1);
 254 }
 255
 256 /**
 257  * batadv_tt_global_size_mod - change the size by v of the local table
 258  *  identified by vid
 259  * @bat_priv: the bat priv with all the soft interface information
 260  * @vid: the VLAN identifier
 261  * @v: the amount to sum to the global table size
 262  */
 263 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 264                                       unsigned short vid, int v)
 265 {
 266         struct batadv_orig_node_vlan *vlan;
 267
 268         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 269         if (!vlan)
 270                 return;
 271
 272         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 273                 spin_lock_bh(&orig_node->vlan_list_lock);
 274                 list_del_rcu(&vlan->list);
 275                 spin_unlock_bh(&orig_node->vlan_list_lock);
 276                 batadv_orig_node_vlan_free_ref(vlan);
 277         }
 278
 279         batadv_orig_node_vlan_free_ref(vlan);
 280 }
 281
 282 /**
 283  * batadv_tt_global_size_inc - increase by one the global table size for the
 284  *  given vid
 285  * @orig_node: the originator which global table size has to be decreased
 286  * @vid: the vlan identifier
 287  */
 288 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 289                                       unsigned short vid)
 290 {
 291         batadv_tt_global_size_mod(orig_node, vid, 1);
 292 }
 293
 294 /**
 295  * batadv_tt_global_size_dec - decrease by one the global table size for the
 296  *  given vid
 297  * @orig_node: the originator which global table size has to be decreased
 298  * @vid: the vlan identifier
 299  */
 300 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 301                                       unsigned short vid)
 302 {
 303         batadv_tt_global_size_mod(orig_node, vid, -1);
 304 }
 305
 306 static void
 307 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 308 {
 309         if (!atomic_dec_and_test(&orig_entry->refcount))
 310                 return;
 311
 312         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 313 }
 314
 315 /**
 316  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 317  * @bat_priv: the bat priv with all the soft interface information
 318  * @tt_local_entry: the TT entry involved in the event
 319  * @event_flags: flags to store in the event structure
 320  */
 321 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 322                                   struct batadv_tt_local_entry *tt_local_entry,
 323                                   uint8_t event_flags)
 324 {
 325         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 326         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 327         uint8_t flags = common->flags | event_flags;
 328         bool event_removed = false;
 329         bool del_op_requested, del_op_entry;
 330
 331         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 332         if (!tt_change_node)
 333                 return;
 334
 335         tt_change_node->change.flags = flags;
 336         tt_change_node->change.reserved = 0;
 337         memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
 338         tt_change_node->change.vid = htons(common->vid);
 339
 340         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 341
 342         /* check for ADD+DEL or DEL+ADD events */
 343         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 344         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 345                                  list) {
 346                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 347                         continue;
 348
 349                 /* DEL+ADD in the same orig interval have no effect and can be
 350                  * removed to avoid silly behaviour on the receiver side. The
 351                  * other way around (ADD+DEL) can happen in case of roaming of
 352                  * a client still in the NEW state. Roaming of NEW clients is
 353                  * now possible due to automatically recognition of "temporary"
 354                  * clients
 355                  */
 356                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 357                 if (!del_op_requested && del_op_entry)
 358                         goto del;
 359                 if (del_op_requested && !del_op_entry)
 360                         goto del;
 361                 continue;
 362 del:
 363                 list_del(&entry->list);
 364                 kfree(entry);
 365                 kfree(tt_change_node);
 366                 event_removed = true;
 367                 goto unlock;
 368         }
 369
 370         /* track the change in the OGMinterval list */
 371         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 372
 373 unlock:
 374         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 375
 376         if (event_removed)
 377                 atomic_dec(&bat_priv->tt.local_changes);
 378         else
 379                 atomic_inc(&bat_priv->tt.local_changes);
 380 }
 381
 382 /**
 383  * batadv_tt_len - compute length in bytes of given number of tt changes
 384  * @changes_num: number of tt changes
 385  *
 386  * Returns computed length in bytes.
 387  */
 388 static int batadv_tt_len(int changes_num)
 389 {
 390         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 391 }
 392
 393 /**
 394  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 395  * @tt_len: available space
 396  *
 397  * Returns the number of entries.
 398  */
 399 static uint16_t batadv_tt_entries(uint16_t tt_len)
 400 {
 401         return tt_len / batadv_tt_len(1);
 402 }
 403
 404 /**
 405  * batadv_tt_local_table_transmit_size - calculates the local translation table
 406  *  size when transmitted over the air
 407  * @bat_priv: the bat priv with all the soft interface information
 408  *
 409  * Returns local translation table size in bytes.
 410  */
 411 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 412 {
 413         uint16_t num_vlan = 0, tt_local_entries = 0;
 414         struct batadv_softif_vlan *vlan;
 415         int hdr_size;
 416
 417         rcu_read_lock();
 418         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 419                 num_vlan++;
 420                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 421         }
 422         rcu_read_unlock();
 423
 424         /* header size of tvlv encapsulated tt response payload */
 425         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 426         hdr_size += sizeof(struct batadv_tvlv_hdr);
 427         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 428         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 429
 430         return hdr_size + batadv_tt_len(tt_local_entries);
 431 }
 432
 433 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 434 {
 435         if (bat_priv->tt.local_hash)
 436                 return 0;
 437
 438         bat_priv->tt.local_hash = batadv_hash_new(1024);
 439
 440         if (!bat_priv->tt.local_hash)
 441                 return -ENOMEM;
 442
 443         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 444                                    &batadv_tt_local_hash_lock_class_key);
 445
 446         return 0;
 447 }
 448
 449 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 450                                   struct batadv_tt_global_entry *tt_global,
 451                                   const char *message)
 452 {
 453         batadv_dbg(BATADV_DBG_TT, bat_priv,
 454                    "Deleting global tt entry %pM (vid: %d): %s\n",
 455                    tt_global->common.addr,
 456                    BATADV_PRINT_VID(tt_global->common.vid), message);
 457
 458         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 459                            batadv_choose_tt, &tt_global->common);
 460         batadv_tt_global_entry_free_ref(tt_global);
 461 }
 462
 463 /**
 464  * batadv_tt_local_add - add a new client to the local table or update an
 465  *  existing client
 466  * @soft_iface: netdev struct of the mesh interface
 467  * @addr: the mac address of the client to add
 468  * @vid: VLAN identifier
 469  * @ifindex: index of the interface where the client is connected to (useful to
 470  *  identify wireless clients)
 471  *
 472  * Returns true if the client was successfully added, false otherwise.
 473  */
 474 bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 475                          unsigned short vid, int ifindex)
 476 {
 477         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 478         struct batadv_tt_local_entry *tt_local;
 479         struct batadv_tt_global_entry *tt_global;
 480         struct net_device *in_dev = NULL;
 481         struct hlist_head *head;
 482         struct batadv_tt_orig_list_entry *orig_entry;
 483         int hash_added, table_size, packet_size_max;
 484         bool ret = false, roamed_back = false;
 485
 486         if (ifindex != BATADV_NULL_IFINDEX)
 487                 in_dev = dev_get_by_index(&init_net, ifindex);
 488
 489         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 490         tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 491
 492         if (tt_local) {
 493                 tt_local->last_seen = jiffies;
 494                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 495                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 496                                    "Re-adding pending client %pM (vid: %d)\n",
 497                                    addr, BATADV_PRINT_VID(vid));
 498                         /* whatever the reason why the PENDING flag was set,
 499                          * this is a client which was enqueued to be removed in
 500                          * this orig_interval. Since it popped up again, the
 501                          * flag can be reset like it was never enqueued
 502                          */
 503                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 504                         goto add_event;
 505                 }
 506
 507                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 508                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 509                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 510                                    addr, BATADV_PRINT_VID(vid));
 511                         /* the ROAM flag is set because this client roamed away
 512                          * and the node got a roaming_advertisement message. Now
 513                          * that the client popped up again at its original
 514                          * location such flag can be unset
 515                          */
 516                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 517                         roamed_back = true;
 518                 }
 519                 goto check_roaming;
 520         }
 521
 522         /* Ignore the client if we cannot send it in a full table response. */
 523         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 524         table_size += batadv_tt_len(1);
 525         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 526         if (table_size > packet_size_max) {
 527                 net_ratelimited_function(batadv_info, soft_iface,
 528                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 529                                          table_size, packet_size_max, addr);
 530                 goto out;
 531         }
 532
 533         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
 534         if (!tt_local)
 535                 goto out;
 536
 537         batadv_dbg(BATADV_DBG_TT, bat_priv,
 538                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 539                    addr, BATADV_PRINT_VID(vid),
 540                    (uint8_t)atomic_read(&bat_priv->tt.vn));
 541
 542         memcpy(tt_local->common.addr, addr, ETH_ALEN);
 543         /* The local entry has to be marked as NEW to avoid to send it in
 544          * a full table response going out before the next ttvn increment
 545          * (consistency check)
 546          */
 547         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 548         tt_local->common.vid = vid;
 549         if (batadv_is_wifi_netdev(in_dev))
 550                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 551         atomic_set(&tt_local->common.refcount, 2);
 552         tt_local->last_seen = jiffies;
 553         tt_local->common.added_at = tt_local->last_seen;
 554
 555         /* the batman interface mac address should never be purged */
 556         if (batadv_compare_eth(addr, soft_iface->dev_addr))
 557                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 558
 559         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 560                                      batadv_choose_tt, &tt_local->common,
 561                                      &tt_local->common.hash_entry);
 562
 563         if (unlikely(hash_added != 0)) {
 564                 /* remove the reference for the hash */
 565                 batadv_tt_local_entry_free_ref(tt_local);
 566                 goto out;
 567         }
 568
 569 add_event:
 570         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 571
 572 check_roaming:
 573         /* Check whether it is a roaming, but don't do anything if the roaming
 574          * process has already been handled
 575          */
 576         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 577                 /* These node are probably going to update their tt table */
 578                 head = &tt_global->orig_list;
 579                 rcu_read_lock();
 580                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 581                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 582                                              tt_global->common.vid,
 583                                              orig_entry->orig_node);
 584                 }
 585                 rcu_read_unlock();
 586                 if (roamed_back) {
 587                         batadv_tt_global_free(bat_priv, tt_global,
 588                                               "Roaming canceled");
 589                         tt_global = NULL;
 590                 } else {
 591                         /* The global entry has to be marked as ROAMING and
 592                          * has to be kept for consistency purpose
 593                          */
 594                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 595                         tt_global->roam_at = jiffies;
 596                 }
 597         }
 598
 599         ret = true;
 600
 601 out:
 602         if (in_dev)
 603                 dev_put(in_dev);
 604         if (tt_local)
 605                 batadv_tt_local_entry_free_ref(tt_local);
 606         if (tt_global)
 607                 batadv_tt_global_entry_free_ref(tt_global);
 608         return ret;
 609 }
 610
 611 /**
 612  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 613  *  within a TT Response directed to another node
 614  * @orig_node: originator for which the TT data has to be prepared
 615  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 616  * @tt_change: uninitialised pointer to the address of the area where the TT
 617  *  changed can be stored
 618  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 619  *  function reserves the amount of space needed to send the entire global TT
 620  *  table. In case of success the value is updated with the real amount of
 621  *  reserved bytes
 622
 623  * Allocate the needed amount of memory for the entire TT TVLV and write its
 624  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 625  * objects, one per active VLAN served by the originator node.
 626  *
 627  * Return the size of the allocated buffer or 0 in case of failure.
 628  */
 629 static uint16_t
 630 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 631                                    struct batadv_tvlv_tt_data **tt_data,
 632                                    struct batadv_tvlv_tt_change **tt_change,
 633                                    int32_t *tt_len)
 634 {
 635         uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
 636         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 637         struct batadv_orig_node_vlan *vlan;
 638         uint8_t *tt_change_ptr;
 639
 640         rcu_read_lock();
 641         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 642                 num_vlan++;
 643                 num_entries += atomic_read(&vlan->tt.num_entries);
 644         }
 645
 646         change_offset = sizeof(**tt_data);
 647         change_offset += num_vlan * sizeof(*tt_vlan);
 648
 649         /* if tt_len is negative, allocate the space needed by the full table */
 650         if (*tt_len < 0)
 651                 *tt_len = batadv_tt_len(num_entries);
 652
 653         tvlv_len = *tt_len;
 654         tvlv_len += change_offset;
 655
 656         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 657         if (!*tt_data) {
 658                 *tt_len = 0;
 659                 goto out;
 660         }
 661
 662         (*tt_data)->flags = BATADV_NO_FLAGS;
 663         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 664         (*tt_data)->num_vlan = htons(num_vlan);
 665
 666         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 667         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 668                 tt_vlan->vid = htons(vlan->vid);
 669                 tt_vlan->crc = htonl(vlan->tt.crc);
 670
 671                 tt_vlan++;
 672         }
 673
 674         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 675         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 676
 677 out:
 678         rcu_read_unlock();
 679         return tvlv_len;
 680 }
 681
 682 /**
 683  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 684  *  node
 685  * @bat_priv: the bat priv with all the soft interface information
 686  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 687  * @tt_change: uninitialised pointer to the address of the area where the TT
 688  *  changes can be stored
 689  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 690  *  function reserves the amount of space needed to send the entire local TT
 691  *  table. In case of success the value is updated with the real amount of
 692  *  reserved bytes
 693  *
 694  * Allocate the needed amount of memory for the entire TT TVLV and write its
 695  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 696  * objects, one per active VLAN.
 697  *
 698  * Return the size of the allocated buffer or 0 in case of failure.
 699  */
 700 static uint16_t
 701 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 702                                   struct batadv_tvlv_tt_data **tt_data,
 703                                   struct batadv_tvlv_tt_change **tt_change,
 704                                   int32_t *tt_len)
 705 {
 706         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 707         struct batadv_softif_vlan *vlan;
 708         uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
 709         uint8_t *tt_change_ptr;
 710         int change_offset;
 711
 712         rcu_read_lock();
 713         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 714                 num_vlan++;
 715                 num_entries += atomic_read(&vlan->tt.num_entries);
 716         }
 717
 718         change_offset = sizeof(**tt_data);
 719         change_offset += num_vlan * sizeof(*tt_vlan);
 720
 721         /* if tt_len is negative, allocate the space needed by the full table */
 722         if (*tt_len < 0)
 723                 *tt_len = batadv_tt_len(num_entries);
 724
 725         tvlv_len = *tt_len;
 726         tvlv_len += change_offset;
 727
 728         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 729         if (!*tt_data) {
 730                 tvlv_len = 0;
 731                 goto out;
 732         }
 733
 734         (*tt_data)->flags = BATADV_NO_FLAGS;
 735         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 736         (*tt_data)->num_vlan = htons(num_vlan);
 737
 738         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 739         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 740                 tt_vlan->vid = htons(vlan->vid);
 741                 tt_vlan->crc = htonl(vlan->tt.crc);
 742
 743                 tt_vlan++;
 744         }
 745
 746         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 747         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 748
 749 out:
 750         rcu_read_unlock();
 751         return tvlv_len;
 752 }
 753
 754 /**
 755  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 756  *  after local tt changes have been committed
 757  * @bat_priv: the bat priv with all the soft interface information
 758  */
 759 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 760 {
 761         struct batadv_tt_change_node *entry, *safe;
 762         struct batadv_tvlv_tt_data *tt_data;
 763         struct batadv_tvlv_tt_change *tt_change;
 764         int tt_diff_len, tt_change_len = 0;
 765         int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
 766         uint16_t tvlv_len;
 767
 768         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 769         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 770
 771         /* if we have too many changes for one packet don't send any
 772          * and wait for the tt table request which will be fragmented
 773          */
 774         if (tt_diff_len > bat_priv->soft_iface->mtu)
 775                 tt_diff_len = 0;
 776
 777         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 778                                                      &tt_change, &tt_diff_len);
 779         if (!tvlv_len)
 780                 return;
 781
 782         tt_data->flags = BATADV_TT_OGM_DIFF;
 783
 784         if (tt_diff_len == 0)
 785                 goto container_register;
 786
 787         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 788         atomic_set(&bat_priv->tt.local_changes, 0);
 789
 790         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 791                                  list) {
 792                 if (tt_diff_entries_count < tt_diff_entries_num) {
 793                         memcpy(tt_change + tt_diff_entries_count,
 794                                &entry->change,
 795                                sizeof(struct batadv_tvlv_tt_change));
 796                         tt_diff_entries_count++;
 797                 }
 798                 list_del(&entry->list);
 799                 kfree(entry);
 800         }
 801         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 802
 803         /* Keep the buffer for possible tt_request */
 804         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 805         kfree(bat_priv->tt.last_changeset);
 806         bat_priv->tt.last_changeset_len = 0;
 807         bat_priv->tt.last_changeset = NULL;
 808         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 809         /* check whether this new OGM has no changes due to size problems */
 810         if (tt_diff_entries_count > 0) {
 811                 /* if kmalloc() fails we will reply with the full table
 812                  * instead of providing the diff
 813                  */
 814                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 815                 if (bat_priv->tt.last_changeset) {
 816                         memcpy(bat_priv->tt.last_changeset,
 817                                tt_change, tt_change_len);
 818                         bat_priv->tt.last_changeset_len = tt_diff_len;
 819                 }
 820         }
 821         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 822
 823 container_register:
 824         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 825                                        tvlv_len);
 826         kfree(tt_data);
 827 }
 828
 829 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 830 {
 831         struct net_device *net_dev = (struct net_device *)seq->private;
 832         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 833         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 834         struct batadv_tt_common_entry *tt_common_entry;
 835         struct batadv_tt_local_entry *tt_local;
 836         struct batadv_hard_iface *primary_if;
 837         struct batadv_softif_vlan *vlan;
 838         struct hlist_head *head;
 839         unsigned short vid;
 840         uint32_t i;
 841         int last_seen_secs;
 842         int last_seen_msecs;
 843         unsigned long last_seen_jiffies;
 844         bool no_purge;
 845         uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
 846
 847         primary_if = batadv_seq_print_text_primary_if_get(seq);
 848         if (!primary_if)
 849                 goto out;
 850
 851         seq_printf(seq,
 852                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 853                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
 854         seq_printf(seq, "       %-13s  %s %-7s %-9s (%-10s)\n", "Client", "VID",
 855                    "Flags", "Last seen", "CRC");
 856
 857         for (i = 0; i < hash->size; i++) {
 858                 head = &hash->table[i];
 859
 860                 rcu_read_lock();
 861                 hlist_for_each_entry_rcu(tt_common_entry,
 862                                          head, hash_entry) {
 863                         tt_local = container_of(tt_common_entry,
 864                                                 struct batadv_tt_local_entry,
 865                                                 common);
 866                         vid = tt_common_entry->vid;
 867                         last_seen_jiffies = jiffies - tt_local->last_seen;
 868                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 869                         last_seen_secs = last_seen_msecs / 1000;
 870                         last_seen_msecs = last_seen_msecs % 1000;
 871
 872                         no_purge = tt_common_entry->flags & np_flag;
 873
 874                         vlan = batadv_softif_vlan_get(bat_priv, vid);
 875                         if (!vlan) {
 876                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
 877                                            BATADV_PRINT_VID(vid));
 878                                 continue;
 879                         }
 880
 881                         seq_printf(seq,
 882                                    " * %pM %4i [%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 883                                    tt_common_entry->addr,
 884                                    BATADV_PRINT_VID(tt_common_entry->vid),
 885                                    (tt_common_entry->flags &
 886                                     BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 887                                    no_purge ? 'P' : '.',
 888                                    (tt_common_entry->flags &
 889                                     BATADV_TT_CLIENT_NEW ? 'N' : '.'),
 890                                    (tt_common_entry->flags &
 891                                     BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
 892                                    (tt_common_entry->flags &
 893                                     BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 894                                    no_purge ? 0 : last_seen_secs,
 895                                    no_purge ? 0 : last_seen_msecs,
 896                                    vlan->tt.crc);
 897
 898                         batadv_softif_vlan_free_ref(vlan);
 899                 }
 900                 rcu_read_unlock();
 901         }
 902 out:
 903         if (primary_if)
 904                 batadv_hardif_free_ref(primary_if);
 905         return 0;
 906 }
 907
 908 static void
 909 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
 910                             struct batadv_tt_local_entry *tt_local_entry,
 911                             uint16_t flags, const char *message)
 912 {
 913         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
 914
 915         /* The local client has to be marked as "pending to be removed" but has
 916          * to be kept in the table in order to send it in a full table
 917          * response issued before the net ttvn increment (consistency check)
 918          */
 919         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
 920
 921         batadv_dbg(BATADV_DBG_TT, bat_priv,
 922                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
 923                    tt_local_entry->common.addr,
 924                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
 925 }
 926
 927 /**
 928  * batadv_tt_local_remove - logically remove an entry from the local table
 929  * @bat_priv: the bat priv with all the soft interface information
 930  * @addr: the MAC address of the client to remove
 931  * @vid: VLAN identifier
 932  * @message: message to append to the log on deletion
 933  * @roaming: true if the deletion is due to a roaming event
 934  *
 935  * Returns the flags assigned to the local entry before being deleted
 936  */
 937 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
 938                                 const uint8_t *addr, unsigned short vid,
 939                                 const char *message, bool roaming)
 940 {
 941         struct batadv_tt_local_entry *tt_local_entry;
 942         uint16_t flags, curr_flags = BATADV_NO_FLAGS;
 943
 944         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
 945         if (!tt_local_entry)
 946                 goto out;
 947
 948         curr_flags = tt_local_entry->common.flags;
 949
 950         flags = BATADV_TT_CLIENT_DEL;
 951         /* if this global entry addition is due to a roaming, the node has to
 952          * mark the local entry as "roamed" in order to correctly reroute
 953          * packets later
 954          */
 955         if (roaming) {
 956                 flags |= BATADV_TT_CLIENT_ROAM;
 957                 /* mark the local client as ROAMed */
 958                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
 959         }
 960
 961         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
 962                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
 963                                             message);
 964                 goto out;
 965         }
 966         /* if this client has been added right now, it is possible to
 967          * immediately purge it
 968          */
 969         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
 970         hlist_del_rcu(&tt_local_entry->common.hash_entry);
 971         batadv_tt_local_entry_free_ref(tt_local_entry);
 972
 973 out:
 974         if (tt_local_entry)
 975                 batadv_tt_local_entry_free_ref(tt_local_entry);
 976
 977         return curr_flags;
 978 }
 979
 980 /**
 981  * batadv_tt_local_purge_list - purge inactive tt local entries
 982  * @bat_priv: the bat priv with all the soft interface information
 983  * @head: pointer to the list containing the local tt entries
 984  * @timeout: parameter deciding whether a given tt local entry is considered
 985  *  inactive or not
 986  */
 987 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
 988                                        struct hlist_head *head,
 989                                        int timeout)
 990 {
 991         struct batadv_tt_local_entry *tt_local_entry;
 992         struct batadv_tt_common_entry *tt_common_entry;
 993         struct hlist_node *node_tmp;
 994
 995         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
 996                                   hash_entry) {
 997                 tt_local_entry = container_of(tt_common_entry,
 998                                               struct batadv_tt_local_entry,
 999                                               common);
1000                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1001                         continue;
1002
1003                 /* entry already marked for deletion */
1004                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1005                         continue;
1006
1007                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1008                         continue;
1009
1010                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1011                                             BATADV_TT_CLIENT_DEL, "timed out");
1012         }
1013 }
1014
1015 /**
1016  * batadv_tt_local_purge - purge inactive tt local entries
1017  * @bat_priv: the bat priv with all the soft interface information
1018  * @timeout: parameter deciding whether a given tt local entry is considered
1019  *  inactive or not
1020  */
1021 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1022                                   int timeout)
1023 {
1024         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1025         struct hlist_head *head;
1026         spinlock_t *list_lock; /* protects write access to the hash lists */
1027         uint32_t i;
1028
1029         for (i = 0; i < hash->size; i++) {
1030                 head = &hash->table[i];
1031                 list_lock = &hash->list_locks[i];
1032
1033                 spin_lock_bh(list_lock);
1034                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1035                 spin_unlock_bh(list_lock);
1036         }
1037 }
1038
1039 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1040 {
1041         struct batadv_hashtable *hash;
1042         spinlock_t *list_lock; /* protects write access to the hash lists */
1043         struct batadv_tt_common_entry *tt_common_entry;
1044         struct batadv_tt_local_entry *tt_local;
1045         struct hlist_node *node_tmp;
1046         struct hlist_head *head;
1047         uint32_t i;
1048
1049         if (!bat_priv->tt.local_hash)
1050                 return;
1051
1052         hash = bat_priv->tt.local_hash;
1053
1054         for (i = 0; i < hash->size; i++) {
1055                 head = &hash->table[i];
1056                 list_lock = &hash->list_locks[i];
1057
1058                 spin_lock_bh(list_lock);
1059                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1060                                           head, hash_entry) {
1061                         hlist_del_rcu(&tt_common_entry->hash_entry);
1062                         tt_local = container_of(tt_common_entry,
1063                                                 struct batadv_tt_local_entry,
1064                                                 common);
1065                         batadv_tt_local_entry_free_ref(tt_local);
1066                 }
1067                 spin_unlock_bh(list_lock);
1068         }
1069
1070         batadv_hash_destroy(hash);
1071
1072         bat_priv->tt.local_hash = NULL;
1073 }
1074
1075 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1076 {
1077         if (bat_priv->tt.global_hash)
1078                 return 0;
1079
1080         bat_priv->tt.global_hash = batadv_hash_new(1024);
1081
1082         if (!bat_priv->tt.global_hash)
1083                 return -ENOMEM;
1084
1085         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1086                                    &batadv_tt_global_hash_lock_class_key);
1087
1088         return 0;
1089 }
1090
1091 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1092 {
1093         struct batadv_tt_change_node *entry, *safe;
1094
1095         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1096
1097         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1098                                  list) {
1099                 list_del(&entry->list);
1100                 kfree(entry);
1101         }
1102
1103         atomic_set(&bat_priv->tt.local_changes, 0);
1104         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1105 }
1106
1107 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1108  * batadv_tt_global_entry list
1109  *
1110  * returns it with an increased refcounter, NULL if not found
1111  */
1112 static struct batadv_tt_orig_list_entry *
1113 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1114                                  const struct batadv_orig_node *orig_node)
1115 {
1116         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1117         const struct hlist_head *head;
1118
1119         rcu_read_lock();
1120         head = &entry->orig_list;
1121         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1122                 if (tmp_orig_entry->orig_node != orig_node)
1123                         continue;
1124                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1125                         continue;
1126
1127                 orig_entry = tmp_orig_entry;
1128                 break;
1129         }
1130         rcu_read_unlock();
1131
1132         return orig_entry;
1133 }
1134
1135 /* find out if an orig_node is already in the list of a tt_global_entry.
1136  * returns true if found, false otherwise
1137  */
1138 static bool
1139 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1140                                 const struct batadv_orig_node *orig_node)
1141 {
1142         struct batadv_tt_orig_list_entry *orig_entry;
1143         bool found = false;
1144
1145         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1146         if (orig_entry) {
1147                 found = true;
1148                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1149         }
1150
1151         return found;
1152 }
1153
1154 static void
1155 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1156                                 struct batadv_orig_node *orig_node, int ttvn)
1157 {
1158         struct batadv_tt_orig_list_entry *orig_entry;
1159
1160         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1161         if (orig_entry) {
1162                 /* refresh the ttvn: the current value could be a bogus one that
1163                  * was added during a "temporary client detection"
1164                  */
1165                 orig_entry->ttvn = ttvn;
1166                 goto out;
1167         }
1168
1169         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1170         if (!orig_entry)
1171                 goto out;
1172
1173         INIT_HLIST_NODE(&orig_entry->list);
1174         atomic_inc(&orig_node->refcount);
1175         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1176         orig_entry->orig_node = orig_node;
1177         orig_entry->ttvn = ttvn;
1178         atomic_set(&orig_entry->refcount, 2);
1179
1180         spin_lock_bh(&tt_global->list_lock);
1181         hlist_add_head_rcu(&orig_entry->list,
1182                            &tt_global->orig_list);
1183         spin_unlock_bh(&tt_global->list_lock);
1184 out:
1185         if (orig_entry)
1186                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1187 }
1188
1189 /**
1190  * batadv_tt_global_add - add a new TT global entry or update an existing one
1191  * @bat_priv: the bat priv with all the soft interface information
1192  * @orig_node: the originator announcing the client
1193  * @tt_addr: the mac address of the non-mesh client
1194  * @vid: VLAN identifier
1195  * @flags: TT flags that have to be set for this non-mesh client
1196  * @ttvn: the tt version number ever announcing this non-mesh client
1197  *
1198  * Add a new TT global entry for the given originator. If the entry already
1199  * exists add a new reference to the given originator (a global entry can have
1200  * references to multiple originators) and adjust the flags attribute to reflect
1201  * the function argument.
1202  * If a TT local entry exists for this non-mesh client remove it.
1203  *
1204  * The caller must hold orig_node refcount.
1205  *
1206  * Return true if the new entry has been added, false otherwise
1207  */
1208 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1209                                  struct batadv_orig_node *orig_node,
1210                                  const unsigned char *tt_addr,
1211                                  unsigned short vid, uint16_t flags,
1212                                  uint8_t ttvn)
1213 {
1214         struct batadv_tt_global_entry *tt_global_entry;
1215         struct batadv_tt_local_entry *tt_local_entry;
1216         bool ret = false;
1217         int hash_added;
1218         struct batadv_tt_common_entry *common;
1219         uint16_t local_flags;
1220
1221         /* ignore global entries from backbone nodes */
1222         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1223                 return true;
1224
1225         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1226         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1227
1228         /* if the node already has a local client for this entry, it has to wait
1229          * for a roaming advertisement instead of manually messing up the global
1230          * table
1231          */
1232         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1233             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1234                 goto out;
1235
1236         if (!tt_global_entry) {
1237                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1238                 if (!tt_global_entry)
1239                         goto out;
1240
1241                 common = &tt_global_entry->common;
1242                 memcpy(common->addr, tt_addr, ETH_ALEN);
1243                 common->vid = vid;
1244
1245                 common->flags = flags;
1246                 tt_global_entry->roam_at = 0;
1247                 /* node must store current time in case of roaming. This is
1248                  * needed to purge this entry out on timeout (if nobody claims
1249                  * it)
1250                  */
1251                 if (flags & BATADV_TT_CLIENT_ROAM)
1252                         tt_global_entry->roam_at = jiffies;
1253                 atomic_set(&common->refcount, 2);
1254                 common->added_at = jiffies;
1255
1256                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1257                 spin_lock_init(&tt_global_entry->list_lock);
1258
1259                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1260                                              batadv_compare_tt,
1261                                              batadv_choose_tt, common,
1262                                              &common->hash_entry);
1263
1264                 if (unlikely(hash_added != 0)) {
1265                         /* remove the reference for the hash */
1266                         batadv_tt_global_entry_free_ref(tt_global_entry);
1267                         goto out_remove;
1268                 }
1269         } else {
1270                 common = &tt_global_entry->common;
1271                 /* If there is already a global entry, we can use this one for
1272                  * our processing.
1273                  * But if we are trying to add a temporary client then here are
1274                  * two options at this point:
1275                  * 1) the global client is not a temporary client: the global
1276                  *    client has to be left as it is, temporary information
1277                  *    should never override any already known client state
1278                  * 2) the global client is a temporary client: purge the
1279                  *    originator list and add the new one orig_entry
1280                  */
1281                 if (flags & BATADV_TT_CLIENT_TEMP) {
1282                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1283                                 goto out;
1284                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1285                                                             orig_node))
1286                                 goto out_remove;
1287                         batadv_tt_global_del_orig_list(tt_global_entry);
1288                         goto add_orig_entry;
1289                 }
1290
1291                 /* if the client was temporary added before receiving the first
1292                  * OGM announcing it, we have to clear the TEMP flag
1293                  */
1294                 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1295
1296                 /* the change can carry possible "attribute" flags like the
1297                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1298                  * client entry
1299                  */
1300                 tt_global_entry->common.flags |= flags;
1301
1302                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1303                  * one originator left in the list and we previously received a
1304                  * delete + roaming change for this originator.
1305                  *
1306                  * We should first delete the old originator before adding the
1307                  * new one.
1308                  */
1309                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1310                         batadv_tt_global_del_orig_list(tt_global_entry);
1311                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1312                         tt_global_entry->roam_at = 0;
1313                 }
1314         }
1315 add_orig_entry:
1316         /* add the new orig_entry (if needed) or update it */
1317         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1318
1319         batadv_dbg(BATADV_DBG_TT, bat_priv,
1320                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1321                    common->addr, BATADV_PRINT_VID(common->vid),
1322                    orig_node->orig);
1323         ret = true;
1324
1325 out_remove:
1326
1327         /* remove address from local hash if present */
1328         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1329                                              "global tt received",
1330                                              flags & BATADV_TT_CLIENT_ROAM);
1331         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1332
1333         if (!(flags & BATADV_TT_CLIENT_ROAM))
1334                 /* this is a normal global add. Therefore the client is not in a
1335                  * roaming state anymore.
1336                  */
1337                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1338
1339 out:
1340         if (tt_global_entry)
1341                 batadv_tt_global_entry_free_ref(tt_global_entry);
1342         if (tt_local_entry)
1343                 batadv_tt_local_entry_free_ref(tt_local_entry);
1344         return ret;
1345 }
1346
1347 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
1348  * @bat_priv: the bat priv with all the soft interface information
1349  * @tt_global_entry: global translation table entry to be analyzed
1350  *
1351  * This functon assumes the caller holds rcu_read_lock().
1352  * Returns best originator list entry or NULL on errors.
1353  */
1354 static struct batadv_tt_orig_list_entry *
1355 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1356                             struct batadv_tt_global_entry *tt_global_entry)
1357 {
1358         struct batadv_neigh_node *router, *best_router = NULL;
1359         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1360         struct hlist_head *head;
1361         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1362
1363         head = &tt_global_entry->orig_list;
1364         hlist_for_each_entry_rcu(orig_entry, head, list) {
1365                 router = batadv_orig_node_get_router(orig_entry->orig_node);
1366                 if (!router)
1367                         continue;
1368
1369                 if (best_router &&
1370                     bao->bat_neigh_cmp(router, best_router) <= 0) {
1371                         batadv_neigh_node_free_ref(router);
1372                         continue;
1373                 }
1374
1375                 /* release the refcount for the "old" best */
1376                 if (best_router)
1377                         batadv_neigh_node_free_ref(best_router);
1378
1379                 best_entry = orig_entry;
1380                 best_router = router;
1381         }
1382
1383         if (best_router)
1384                 batadv_neigh_node_free_ref(best_router);
1385
1386         return best_entry;
1387 }
1388
1389 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1390  * for this global entry
1391  * @bat_priv: the bat priv with all the soft interface information
1392  * @tt_global_entry: global translation table entry to be printed
1393  * @seq: debugfs table seq_file struct
1394  *
1395  * This functon assumes the caller holds rcu_read_lock().
1396  */
1397 static void
1398 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1399                              struct batadv_tt_global_entry *tt_global_entry,
1400                              struct seq_file *seq)
1401 {
1402         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1403         struct batadv_tt_common_entry *tt_common_entry;
1404         struct batadv_orig_node_vlan *vlan;
1405         struct hlist_head *head;
1406         uint8_t last_ttvn;
1407         uint16_t flags;
1408
1409         tt_common_entry = &tt_global_entry->common;
1410         flags = tt_common_entry->flags;
1411
1412         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1413         if (best_entry) {
1414                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1415                                                  tt_common_entry->vid);
1416                 if (!vlan) {
1417                         seq_printf(seq,
1418                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1419                                    BATADV_PRINT_VID(tt_common_entry->vid),
1420                                    best_entry->orig_node->orig);
1421                         goto print_list;
1422                 }
1423
1424                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1425                 seq_printf(seq,
1426                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c]\n",
1427                            '*', tt_global_entry->common.addr,
1428                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1429                            best_entry->ttvn, best_entry->orig_node->orig,
1430                            last_ttvn, vlan->tt.crc,
1431                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1432                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1433                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1434
1435                 batadv_orig_node_vlan_free_ref(vlan);
1436         }
1437
1438 print_list:
1439         head = &tt_global_entry->orig_list;
1440
1441         hlist_for_each_entry_rcu(orig_entry, head, list) {
1442                 if (best_entry == orig_entry)
1443                         continue;
1444
1445                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1446                                                  tt_common_entry->vid);
1447                 if (!vlan) {
1448                         seq_printf(seq,
1449                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1450                                    BATADV_PRINT_VID(tt_common_entry->vid),
1451                                    orig_entry->orig_node->orig);
1452                         continue;
1453                 }
1454
1455                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1456                 seq_printf(seq,
1457                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c]\n",
1458                            '+', tt_global_entry->common.addr,
1459                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1460                            orig_entry->ttvn, orig_entry->orig_node->orig,
1461                            last_ttvn, vlan->tt.crc,
1462                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1463                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1464                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1465
1466                 batadv_orig_node_vlan_free_ref(vlan);
1467         }
1468 }
1469
1470 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1471 {
1472         struct net_device *net_dev = (struct net_device *)seq->private;
1473         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1474         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1475         struct batadv_tt_common_entry *tt_common_entry;
1476         struct batadv_tt_global_entry *tt_global;
1477         struct batadv_hard_iface *primary_if;
1478         struct hlist_head *head;
1479         uint32_t i;
1480
1481         primary_if = batadv_seq_print_text_primary_if_get(seq);
1482         if (!primary_if)
1483                 goto out;
1484
1485         seq_printf(seq,
1486                    "Globally announced TT entries received via the mesh %s\n",
1487                    net_dev->name);
1488         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1489                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1490                    "CRC", "Flags");
1491
1492         for (i = 0; i < hash->size; i++) {
1493                 head = &hash->table[i];
1494
1495                 rcu_read_lock();
1496                 hlist_for_each_entry_rcu(tt_common_entry,
1497                                          head, hash_entry) {
1498                         tt_global = container_of(tt_common_entry,
1499                                                  struct batadv_tt_global_entry,
1500                                                  common);
1501                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1502                 }
1503                 rcu_read_unlock();
1504         }
1505 out:
1506         if (primary_if)
1507                 batadv_hardif_free_ref(primary_if);
1508         return 0;
1509 }
1510
1511 /* deletes the orig list of a tt_global_entry */
1512 static void
1513 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1514 {
1515         struct hlist_head *head;
1516         struct hlist_node *safe;
1517         struct batadv_tt_orig_list_entry *orig_entry;
1518
1519         spin_lock_bh(&tt_global_entry->list_lock);
1520         head = &tt_global_entry->orig_list;
1521         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1522                 hlist_del_rcu(&orig_entry->list);
1523                 batadv_tt_global_size_dec(orig_entry->orig_node,
1524                                           tt_global_entry->common.vid);
1525                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1526         }
1527         spin_unlock_bh(&tt_global_entry->list_lock);
1528 }
1529
1530 static void
1531 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
1532                                 struct batadv_tt_global_entry *tt_global_entry,
1533                                 struct batadv_orig_node *orig_node,
1534                                 const char *message)
1535 {
1536         struct hlist_head *head;
1537         struct hlist_node *safe;
1538         struct batadv_tt_orig_list_entry *orig_entry;
1539         unsigned short vid;
1540
1541         spin_lock_bh(&tt_global_entry->list_lock);
1542         head = &tt_global_entry->orig_list;
1543         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1544                 if (orig_entry->orig_node == orig_node) {
1545                         vid = tt_global_entry->common.vid;
1546                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1547                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1548                                    orig_node->orig,
1549                                    tt_global_entry->common.addr,
1550                                    BATADV_PRINT_VID(vid), message);
1551                         hlist_del_rcu(&orig_entry->list);
1552                         batadv_tt_global_size_dec(orig_node,
1553                                                   tt_global_entry->common.vid);
1554                         batadv_tt_orig_list_entry_free_ref(orig_entry);
1555                 }
1556         }
1557         spin_unlock_bh(&tt_global_entry->list_lock);
1558 }
1559
1560 /* If the client is to be deleted, we check if it is the last origantor entry
1561  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1562  * timer, otherwise we simply remove the originator scheduled for deletion.
1563  */
1564 static void
1565 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1566                              struct batadv_tt_global_entry *tt_global_entry,
1567                              struct batadv_orig_node *orig_node,
1568                              const char *message)
1569 {
1570         bool last_entry = true;
1571         struct hlist_head *head;
1572         struct batadv_tt_orig_list_entry *orig_entry;
1573
1574         /* no local entry exists, case 1:
1575          * Check if this is the last one or if other entries exist.
1576          */
1577
1578         rcu_read_lock();
1579         head = &tt_global_entry->orig_list;
1580         hlist_for_each_entry_rcu(orig_entry, head, list) {
1581                 if (orig_entry->orig_node != orig_node) {
1582                         last_entry = false;
1583                         break;
1584                 }
1585         }
1586         rcu_read_unlock();
1587
1588         if (last_entry) {
1589                 /* its the last one, mark for roaming. */
1590                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1591                 tt_global_entry->roam_at = jiffies;
1592         } else
1593                 /* there is another entry, we can simply delete this
1594                  * one and can still use the other one.
1595                  */
1596                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1597                                                 orig_node, message);
1598 }
1599
1600 /**
1601  * batadv_tt_global_del - remove a client from the global table
1602  * @bat_priv: the bat priv with all the soft interface information
1603  * @orig_node: an originator serving this client
1604  * @addr: the mac address of the client
1605  * @vid: VLAN identifier
1606  * @message: a message explaining the reason for deleting the client to print
1607  *  for debugging purpose
1608  * @roaming: true if the deletion has been triggered by a roaming event
1609  */
1610 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1611                                  struct batadv_orig_node *orig_node,
1612                                  const unsigned char *addr, unsigned short vid,
1613                                  const char *message, bool roaming)
1614 {
1615         struct batadv_tt_global_entry *tt_global_entry;
1616         struct batadv_tt_local_entry *local_entry = NULL;
1617
1618         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1619         if (!tt_global_entry)
1620                 goto out;
1621
1622         if (!roaming) {
1623                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1624                                                 orig_node, message);
1625
1626                 if (hlist_empty(&tt_global_entry->orig_list))
1627                         batadv_tt_global_free(bat_priv, tt_global_entry,
1628                                               message);
1629
1630                 goto out;
1631         }
1632
1633         /* if we are deleting a global entry due to a roam
1634          * event, there are two possibilities:
1635          * 1) the client roamed from node A to node B => if there
1636          *    is only one originator left for this client, we mark
1637          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1638          *    wait for node B to claim it. In case of timeout
1639          *    the entry is purged.
1640          *
1641          *    If there are other originators left, we directly delete
1642          *    the originator.
1643          * 2) the client roamed to us => we can directly delete
1644          *    the global entry, since it is useless now.
1645          */
1646         local_entry = batadv_tt_local_hash_find(bat_priv,
1647                                                 tt_global_entry->common.addr,
1648                                                 vid);
1649         if (local_entry) {
1650                 /* local entry exists, case 2: client roamed to us. */
1651                 batadv_tt_global_del_orig_list(tt_global_entry);
1652                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1653         } else
1654                 /* no local entry exists, case 1: check for roaming */
1655                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1656                                              orig_node, message);
1657
1658
1659 out:
1660         if (tt_global_entry)
1661                 batadv_tt_global_entry_free_ref(tt_global_entry);
1662         if (local_entry)
1663                 batadv_tt_local_entry_free_ref(local_entry);
1664 }
1665
1666 /**
1667  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1668  *  given originator matching the provided vid
1669  * @bat_priv: the bat priv with all the soft interface information
1670  * @orig_node: the originator owning the entries to remove
1671  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1672  *  removed
1673  * @message: debug message to print as "reason"
1674  */
1675 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1676                                struct batadv_orig_node *orig_node,
1677                                int32_t match_vid,
1678                                const char *message)
1679 {
1680         struct batadv_tt_global_entry *tt_global;
1681         struct batadv_tt_common_entry *tt_common_entry;
1682         uint32_t i;
1683         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1684         struct hlist_node *safe;
1685         struct hlist_head *head;
1686         spinlock_t *list_lock; /* protects write access to the hash lists */
1687         unsigned short vid;
1688
1689         if (!hash)
1690                 return;
1691
1692         for (i = 0; i < hash->size; i++) {
1693                 head = &hash->table[i];
1694                 list_lock = &hash->list_locks[i];
1695
1696                 spin_lock_bh(list_lock);
1697                 hlist_for_each_entry_safe(tt_common_entry, safe,
1698                                           head, hash_entry) {
1699                         /* remove only matching entries */
1700                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1701                                 continue;
1702
1703                         tt_global = container_of(tt_common_entry,
1704                                                  struct batadv_tt_global_entry,
1705                                                  common);
1706
1707                         batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1708                                                         orig_node, message);
1709
1710                         if (hlist_empty(&tt_global->orig_list)) {
1711                                 vid = tt_global->common.vid;
1712                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1713                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1714                                            tt_global->common.addr,
1715                                            BATADV_PRINT_VID(vid), message);
1716                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1717                                 batadv_tt_global_entry_free_ref(tt_global);
1718                         }
1719                 }
1720                 spin_unlock_bh(list_lock);
1721         }
1722         orig_node->tt_initialised = false;
1723 }
1724
1725 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1726                                       char **msg)
1727 {
1728         bool purge = false;
1729         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1730         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1731
1732         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1733             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1734                 purge = true;
1735                 *msg = "Roaming timeout\n";
1736         }
1737
1738         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1739             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1740                 purge = true;
1741                 *msg = "Temporary client timeout\n";
1742         }
1743
1744         return purge;
1745 }
1746
1747 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1748 {
1749         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1750         struct hlist_head *head;
1751         struct hlist_node *node_tmp;
1752         spinlock_t *list_lock; /* protects write access to the hash lists */
1753         uint32_t i;
1754         char *msg = NULL;
1755         struct batadv_tt_common_entry *tt_common;
1756         struct batadv_tt_global_entry *tt_global;
1757
1758         for (i = 0; i < hash->size; i++) {
1759                 head = &hash->table[i];
1760                 list_lock = &hash->list_locks[i];
1761
1762                 spin_lock_bh(list_lock);
1763                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1764                                           hash_entry) {
1765                         tt_global = container_of(tt_common,
1766                                                  struct batadv_tt_global_entry,
1767                                                  common);
1768
1769                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1770                                 continue;
1771
1772                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1773                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1774                                    tt_global->common.addr,
1775                                    BATADV_PRINT_VID(tt_global->common.vid),
1776                                    msg);
1777
1778                         hlist_del_rcu(&tt_common->hash_entry);
1779
1780                         batadv_tt_global_entry_free_ref(tt_global);
1781                 }
1782                 spin_unlock_bh(list_lock);
1783         }
1784 }
1785
1786 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1787 {
1788         struct batadv_hashtable *hash;
1789         spinlock_t *list_lock; /* protects write access to the hash lists */
1790         struct batadv_tt_common_entry *tt_common_entry;
1791         struct batadv_tt_global_entry *tt_global;
1792         struct hlist_node *node_tmp;
1793         struct hlist_head *head;
1794         uint32_t i;
1795
1796         if (!bat_priv->tt.global_hash)
1797                 return;
1798
1799         hash = bat_priv->tt.global_hash;
1800
1801         for (i = 0; i < hash->size; i++) {
1802                 head = &hash->table[i];
1803                 list_lock = &hash->list_locks[i];
1804
1805                 spin_lock_bh(list_lock);
1806                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1807                                           head, hash_entry) {
1808                         hlist_del_rcu(&tt_common_entry->hash_entry);
1809                         tt_global = container_of(tt_common_entry,
1810                                                  struct batadv_tt_global_entry,
1811                                                  common);
1812                         batadv_tt_global_entry_free_ref(tt_global);
1813                 }
1814                 spin_unlock_bh(list_lock);
1815         }
1816
1817         batadv_hash_destroy(hash);
1818
1819         bat_priv->tt.global_hash = NULL;
1820 }
1821
1822 static bool
1823 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1824                        struct batadv_tt_global_entry *tt_global_entry)
1825 {
1826         bool ret = false;
1827
1828         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1829             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1830                 ret = true;
1831
1832         return ret;
1833 }
1834
1835 /**
1836  * batadv_transtable_search - get the mesh destination for a given client
1837  * @bat_priv: the bat priv with all the soft interface information
1838  * @src: mac address of the source client
1839  * @addr: mac address of the destination client
1840  * @vid: VLAN identifier
1841  *
1842  * Returns a pointer to the originator that was selected as destination in the
1843  * mesh for contacting the client 'addr', NULL otherwise.
1844  * In case of multiple originators serving the same client, the function returns
1845  * the best one (best in terms of metric towards the destination node).
1846  *
1847  * If the two clients are AP isolated the function returns NULL.
1848  */
1849 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1850                                                   const uint8_t *src,
1851                                                   const uint8_t *addr,
1852                                                   unsigned short vid)
1853 {
1854         struct batadv_tt_local_entry *tt_local_entry = NULL;
1855         struct batadv_tt_global_entry *tt_global_entry = NULL;
1856         struct batadv_orig_node *orig_node = NULL;
1857         struct batadv_tt_orig_list_entry *best_entry;
1858         bool ap_isolation_enabled = false;
1859         struct batadv_softif_vlan *vlan;
1860
1861         /* if the AP isolation is requested on a VLAN, then check for its
1862          * setting in the proper VLAN private data structure
1863          */
1864         vlan = batadv_softif_vlan_get(bat_priv, vid);
1865         if (vlan) {
1866                 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
1867                 batadv_softif_vlan_free_ref(vlan);
1868         }
1869
1870         if (src && ap_isolation_enabled) {
1871                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1872                 if (!tt_local_entry ||
1873                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1874                         goto out;
1875         }
1876
1877         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1878         if (!tt_global_entry)
1879                 goto out;
1880
1881         /* check whether the clients should not communicate due to AP
1882          * isolation
1883          */
1884         if (tt_local_entry &&
1885             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1886                 goto out;
1887
1888         rcu_read_lock();
1889         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1890         /* found anything? */
1891         if (best_entry)
1892                 orig_node = best_entry->orig_node;
1893         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1894                 orig_node = NULL;
1895         rcu_read_unlock();
1896
1897 out:
1898         if (tt_global_entry)
1899                 batadv_tt_global_entry_free_ref(tt_global_entry);
1900         if (tt_local_entry)
1901                 batadv_tt_local_entry_free_ref(tt_local_entry);
1902
1903         return orig_node;
1904 }
1905
1906 /**
1907  * batadv_tt_global_crc - calculates the checksum of the local table belonging
1908  *  to the given orig_node
1909  * @bat_priv: the bat priv with all the soft interface information
1910  * @orig_node: originator for which the CRC should be computed
1911  * @vid: VLAN identifier for which the CRC32 has to be computed
1912  *
1913  * This function computes the checksum for the global table corresponding to a
1914  * specific originator. In particular, the checksum is computed as follows: For
1915  * each client connected to the originator the CRC32C of the MAC address and the
1916  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1917  * together.
1918  *
1919  * The idea behind is that CRC32C should be used as much as possible in order to
1920  * produce a unique hash of the table, but since the order which is used to feed
1921  * the CRC32C function affects the result and since every node in the network
1922  * probably sorts the clients differently, the hash function cannot be directly
1923  * computed over the entire table. Hence the CRC32C is used only on
1924  * the single client entry, while all the results are then xor'ed together
1925  * because the XOR operation can combine them all while trying to reduce the
1926  * noise as much as possible.
1927  *
1928  * Returns the checksum of the global table of a given originator.
1929  */
1930 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1931                                      struct batadv_orig_node *orig_node,
1932                                      unsigned short vid)
1933 {
1934         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1935         struct batadv_tt_common_entry *tt_common;
1936         struct batadv_tt_global_entry *tt_global;
1937         struct hlist_head *head;
1938         uint32_t i, crc_tmp, crc = 0;
1939
1940         for (i = 0; i < hash->size; i++) {
1941                 head = &hash->table[i];
1942
1943                 rcu_read_lock();
1944                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1945                         tt_global = container_of(tt_common,
1946                                                  struct batadv_tt_global_entry,
1947                                                  common);
1948                         /* compute the CRC only for entries belonging to the
1949                          * VLAN identified by the vid passed as parameter
1950                          */
1951                         if (tt_common->vid != vid)
1952                                 continue;
1953
1954                         /* Roaming clients are in the global table for
1955                          * consistency only. They don't have to be
1956                          * taken into account while computing the
1957                          * global crc
1958                          */
1959                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
1960                                 continue;
1961                         /* Temporary clients have not been announced yet, so
1962                          * they have to be skipped while computing the global
1963                          * crc
1964                          */
1965                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
1966                                 continue;
1967
1968                         /* find out if this global entry is announced by this
1969                          * originator
1970                          */
1971                         if (!batadv_tt_global_entry_has_orig(tt_global,
1972                                                              orig_node))
1973                                 continue;
1974
1975                         crc_tmp = crc32c(0, &tt_common->vid,
1976                                          sizeof(tt_common->vid));
1977                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
1978                 }
1979                 rcu_read_unlock();
1980         }
1981
1982         return crc;
1983 }
1984
1985 /**
1986  * batadv_tt_local_crc - calculates the checksum of the local table
1987  * @bat_priv: the bat priv with all the soft interface information
1988  * @vid: VLAN identifier for which the CRC32 has to be computed
1989  *
1990  * For details about the computation, please refer to the documentation for
1991  * batadv_tt_global_crc().
1992  *
1993  * Returns the checksum of the local table
1994  */
1995 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
1996                                     unsigned short vid)
1997 {
1998         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1999         struct batadv_tt_common_entry *tt_common;
2000         struct hlist_head *head;
2001         uint32_t i, crc_tmp, crc = 0;
2002
2003         for (i = 0; i < hash->size; i++) {
2004                 head = &hash->table[i];
2005
2006                 rcu_read_lock();
2007                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2008                         /* compute the CRC only for entries belonging to the
2009                          * VLAN identified by vid
2010                          */
2011                         if (tt_common->vid != vid)
2012                                 continue;
2013
2014                         /* not yet committed clients have not to be taken into
2015                          * account while computing the CRC
2016                          */
2017                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2018                                 continue;
2019
2020                         crc_tmp = crc32c(0, &tt_common->vid,
2021                                          sizeof(tt_common->vid));
2022                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2023                 }
2024                 rcu_read_unlock();
2025         }
2026
2027         return crc;
2028 }
2029
2030 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2031 {
2032         struct batadv_tt_req_node *node, *safe;
2033
2034         spin_lock_bh(&bat_priv->tt.req_list_lock);
2035
2036         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2037                 list_del(&node->list);
2038                 kfree(node);
2039         }
2040
2041         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2042 }
2043
2044 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2045                                        struct batadv_orig_node *orig_node,
2046                                        const void *tt_buff,
2047                                        uint16_t tt_buff_len)
2048 {
2049         /* Replace the old buffer only if I received something in the
2050          * last OGM (the OGM could carry no changes)
2051          */
2052         spin_lock_bh(&orig_node->tt_buff_lock);
2053         if (tt_buff_len > 0) {
2054                 kfree(orig_node->tt_buff);
2055                 orig_node->tt_buff_len = 0;
2056                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2057                 if (orig_node->tt_buff) {
2058                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2059                         orig_node->tt_buff_len = tt_buff_len;
2060                 }
2061         }
2062         spin_unlock_bh(&orig_node->tt_buff_lock);
2063 }
2064
2065 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2066 {
2067         struct batadv_tt_req_node *node, *safe;
2068
2069         spin_lock_bh(&bat_priv->tt.req_list_lock);
2070         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2071                 if (batadv_has_timed_out(node->issued_at,
2072                                          BATADV_TT_REQUEST_TIMEOUT)) {
2073                         list_del(&node->list);
2074                         kfree(node);
2075                 }
2076         }
2077         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2078 }
2079
2080 /* returns the pointer to the new tt_req_node struct if no request
2081  * has already been issued for this orig_node, NULL otherwise
2082  */
2083 static struct batadv_tt_req_node *
2084 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2085                        struct batadv_orig_node *orig_node)
2086 {
2087         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2088
2089         spin_lock_bh(&bat_priv->tt.req_list_lock);
2090         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2091                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2092                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2093                                           BATADV_TT_REQUEST_TIMEOUT))
2094                         goto unlock;
2095         }
2096
2097         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2098         if (!tt_req_node)
2099                 goto unlock;
2100
2101         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
2102         tt_req_node->issued_at = jiffies;
2103
2104         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2105 unlock:
2106         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2107         return tt_req_node;
2108 }
2109
2110 /**
2111  * batadv_tt_local_valid - verify that given tt entry is a valid one
2112  * @entry_ptr: to be checked local tt entry
2113  * @data_ptr: not used but definition required to satisfy the callback prototype
2114  *
2115  * Returns 1 if the entry is a valid, 0 otherwise.
2116  */
2117 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2118 {
2119         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2120
2121         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2122                 return 0;
2123         return 1;
2124 }
2125
2126 static int batadv_tt_global_valid(const void *entry_ptr,
2127                                   const void *data_ptr)
2128 {
2129         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2130         const struct batadv_tt_global_entry *tt_global_entry;
2131         const struct batadv_orig_node *orig_node = data_ptr;
2132
2133         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2134             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2135                 return 0;
2136
2137         tt_global_entry = container_of(tt_common_entry,
2138                                        struct batadv_tt_global_entry,
2139                                        common);
2140
2141         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2142 }
2143
2144 /**
2145  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2146  *  specified tt hash
2147  * @bat_priv: the bat priv with all the soft interface information
2148  * @hash: hash table containing the tt entries
2149  * @tt_len: expected tvlv tt data buffer length in number of bytes
2150  * @tvlv_buff: pointer to the buffer to fill with the TT data
2151  * @valid_cb: function to filter tt change entries
2152  * @cb_data: data passed to the filter function as argument
2153  */
2154 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2155                                     struct batadv_hashtable *hash,
2156                                     void *tvlv_buff, uint16_t tt_len,
2157                                     int (*valid_cb)(const void *, const void *),
2158                                     void *cb_data)
2159 {
2160         struct batadv_tt_common_entry *tt_common_entry;
2161         struct batadv_tvlv_tt_change *tt_change;
2162         struct hlist_head *head;
2163         uint16_t tt_tot, tt_num_entries = 0;
2164         uint32_t i;
2165
2166         tt_tot = batadv_tt_entries(tt_len);
2167         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2168
2169         rcu_read_lock();
2170         for (i = 0; i < hash->size; i++) {
2171                 head = &hash->table[i];
2172
2173                 hlist_for_each_entry_rcu(tt_common_entry,
2174                                          head, hash_entry) {
2175                         if (tt_tot == tt_num_entries)
2176                                 break;
2177
2178                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2179                                 continue;
2180
2181                         memcpy(tt_change->addr, tt_common_entry->addr,
2182                                ETH_ALEN);
2183                         tt_change->flags = tt_common_entry->flags;
2184                         tt_change->vid = htons(tt_common_entry->vid);
2185                         tt_change->reserved = 0;
2186
2187                         tt_num_entries++;
2188                         tt_change++;
2189                 }
2190         }
2191         rcu_read_unlock();
2192 }
2193
2194 /**
2195  * batadv_tt_global_check_crc - check if all the CRCs are correct
2196  * @orig_node: originator for which the CRCs have to be checked
2197  * @tt_vlan: pointer to the first tvlv VLAN entry
2198  * @num_vlan: number of tvlv VLAN entries
2199  * @create: if true, create VLAN objects if not found
2200  *
2201  * Return true if all the received CRCs match the locally stored ones, false
2202  * otherwise
2203  */
2204 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2205                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2206                                        uint16_t num_vlan)
2207 {
2208         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2209         struct batadv_orig_node_vlan *vlan;
2210         int i;
2211
2212         /* check if each received CRC matches the locally stored one */
2213         for (i = 0; i < num_vlan; i++) {
2214                 tt_vlan_tmp = tt_vlan + i;
2215
2216                 /* if orig_node is a backbone node for this VLAN, don't check
2217                  * the CRC as we ignore all the global entries over it
2218                  */
2219                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2220                                                    orig_node->orig,
2221                                                    ntohs(tt_vlan_tmp->vid)))
2222                         continue;
2223
2224                 vlan = batadv_orig_node_vlan_get(orig_node,
2225                                                  ntohs(tt_vlan_tmp->vid));
2226                 if (!vlan)
2227                         return false;
2228
2229                 if (vlan->tt.crc != ntohl(tt_vlan_tmp->crc))
2230                         return false;
2231         }
2232
2233         return true;
2234 }
2235
2236 /**
2237  * batadv_tt_local_update_crc - update all the local CRCs
2238  * @bat_priv: the bat priv with all the soft interface information
2239  */
2240 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2241 {
2242         struct batadv_softif_vlan *vlan;
2243
2244         /* recompute the global CRC for each VLAN */
2245         rcu_read_lock();
2246         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2247                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2248         }
2249         rcu_read_unlock();
2250 }
2251
2252 /**
2253  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2254  * @bat_priv: the bat priv with all the soft interface information
2255  * @orig_node: the orig_node for which the CRCs have to be updated
2256  */
2257 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2258                                         struct batadv_orig_node *orig_node)
2259 {
2260         struct batadv_orig_node_vlan *vlan;
2261         uint32_t crc;
2262
2263         /* recompute the global CRC for each VLAN */
2264         rcu_read_lock();
2265         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2266                 /* if orig_node is a backbone node for this VLAN, don't compute
2267                  * the CRC as we ignore all the global entries over it
2268                  */
2269                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2270                                                    vlan->vid))
2271                         continue;
2272
2273                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2274                 vlan->tt.crc = crc;
2275         }
2276         rcu_read_unlock();
2277 }
2278
2279 /**
2280  * batadv_send_tt_request - send a TT Request message to a given node
2281  * @bat_priv: the bat priv with all the soft interface information
2282  * @dst_orig_node: the destination of the message
2283  * @ttvn: the version number that the source of the message is looking for
2284  * @tt_vlan: pointer to the first tvlv VLAN object to request
2285  * @num_vlan: number of tvlv VLAN entries
2286  * @full_table: ask for the entire translation table if true, while only for the
2287  *  last TT diff otherwise
2288  */
2289 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2290                                   struct batadv_orig_node *dst_orig_node,
2291                                   uint8_t ttvn,
2292                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2293                                   uint16_t num_vlan, bool full_table)
2294 {
2295         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2296         struct batadv_tt_req_node *tt_req_node = NULL;
2297         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2298         struct batadv_hard_iface *primary_if;
2299         bool ret = false;
2300         int i, size;
2301
2302         primary_if = batadv_primary_if_get_selected(bat_priv);
2303         if (!primary_if)
2304                 goto out;
2305
2306         /* The new tt_req will be issued only if I'm not waiting for a
2307          * reply from the same orig_node yet
2308          */
2309         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2310         if (!tt_req_node)
2311                 goto out;
2312
2313         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2314         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2315         if (!tvlv_tt_data)
2316                 goto out;
2317
2318         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2319         tvlv_tt_data->ttvn = ttvn;
2320         tvlv_tt_data->num_vlan = htons(num_vlan);
2321
2322         /* send all the CRCs within the request. This is needed by intermediate
2323          * nodes to ensure they have the correct table before replying
2324          */
2325         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2326         for (i = 0; i < num_vlan; i++) {
2327                 tt_vlan_req->vid = tt_vlan->vid;
2328                 tt_vlan_req->crc = tt_vlan->crc;
2329
2330                 tt_vlan_req++;
2331                 tt_vlan++;
2332         }
2333
2334         if (full_table)
2335                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2336
2337         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2338                    dst_orig_node->orig, full_table ? 'F' : '.');
2339
2340         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2341         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2342                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2343                                  tvlv_tt_data, size);
2344         ret = true;
2345
2346 out:
2347         if (primary_if)
2348                 batadv_hardif_free_ref(primary_if);
2349         if (ret && tt_req_node) {
2350                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2351                 list_del(&tt_req_node->list);
2352                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2353                 kfree(tt_req_node);
2354         }
2355         kfree(tvlv_tt_data);
2356         return ret;
2357 }
2358
2359 /**
2360  * batadv_send_other_tt_response - send reply to tt request concerning another
2361  *  node's translation table
2362  * @bat_priv: the bat priv with all the soft interface information
2363  * @tt_data: tt data containing the tt request information
2364  * @req_src: mac address of tt request sender
2365  * @req_dst: mac address of tt request recipient
2366  *
2367  * Returns true if tt request reply was sent, false otherwise.
2368  */
2369 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2370                                           struct batadv_tvlv_tt_data *tt_data,
2371                                           uint8_t *req_src, uint8_t *req_dst)
2372 {
2373         struct batadv_orig_node *req_dst_orig_node;
2374         struct batadv_orig_node *res_dst_orig_node = NULL;
2375         struct batadv_tvlv_tt_change *tt_change;
2376         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2377         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2378         bool ret = false, full_table;
2379         uint8_t orig_ttvn, req_ttvn;
2380         uint16_t tvlv_len;
2381         int32_t tt_len;
2382
2383         batadv_dbg(BATADV_DBG_TT, bat_priv,
2384                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2385                    req_src, tt_data->ttvn, req_dst,
2386                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2387
2388         /* Let's get the orig node of the REAL destination */
2389         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2390         if (!req_dst_orig_node)
2391                 goto out;
2392
2393         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2394         if (!res_dst_orig_node)
2395                 goto out;
2396
2397         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2398         req_ttvn = tt_data->ttvn;
2399
2400         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2401         /* this node doesn't have the requested data */
2402         if (orig_ttvn != req_ttvn ||
2403             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2404                                         ntohs(tt_data->num_vlan)))
2405                 goto out;
2406
2407         /* If the full table has been explicitly requested */
2408         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2409             !req_dst_orig_node->tt_buff)
2410                 full_table = true;
2411         else
2412                 full_table = false;
2413
2414         /* TT fragmentation hasn't been implemented yet, so send as many
2415          * TT entries fit a single packet as possible only
2416          */
2417         if (!full_table) {
2418                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2419                 tt_len = req_dst_orig_node->tt_buff_len;
2420
2421                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2422                                                               &tvlv_tt_data,
2423                                                               &tt_change,
2424                                                               &tt_len);
2425                 if (!tt_len)
2426                         goto unlock;
2427
2428                 /* Copy the last orig_node's OGM buffer */
2429                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2430                        req_dst_orig_node->tt_buff_len);
2431                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2432         } else {
2433                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2434                  * in the initial part
2435                  */
2436                 tt_len = -1;
2437                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2438                                                               &tvlv_tt_data,
2439                                                               &tt_change,
2440                                                               &tt_len);
2441                 if (!tt_len)
2442                         goto out;
2443
2444                 /* fill the rest of the tvlv with the real TT entries */
2445                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2446                                         tt_change, tt_len,
2447                                         batadv_tt_global_valid,
2448                                         req_dst_orig_node);
2449         }
2450
2451         /* Don't send the response, if larger than fragmented packet. */
2452         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2453         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2454                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2455                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2456                                          res_dst_orig_node->orig);
2457                 goto out;
2458         }
2459
2460         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2461         tvlv_tt_data->ttvn = req_ttvn;
2462
2463         if (full_table)
2464                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2465
2466         batadv_dbg(BATADV_DBG_TT, bat_priv,
2467                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2468                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2469                    full_table ? 'F' : '.', req_ttvn);
2470
2471         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2472
2473         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2474                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2475                                  tvlv_len);
2476
2477         ret = true;
2478         goto out;
2479
2480 unlock:
2481         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2482
2483 out:
2484         if (res_dst_orig_node)
2485                 batadv_orig_node_free_ref(res_dst_orig_node);
2486         if (req_dst_orig_node)
2487                 batadv_orig_node_free_ref(req_dst_orig_node);
2488         kfree(tvlv_tt_data);
2489         return ret;
2490 }
2491
2492 /**
2493  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2494  *  translation table
2495  * @bat_priv: the bat priv with all the soft interface information
2496  * @tt_data: tt data containing the tt request information
2497  * @req_src: mac address of tt request sender
2498  *
2499  * Returns true if tt request reply was sent, false otherwise.
2500  */
2501 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2502                                        struct batadv_tvlv_tt_data *tt_data,
2503                                        uint8_t *req_src)
2504 {
2505         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2506         struct batadv_hard_iface *primary_if = NULL;
2507         struct batadv_tvlv_tt_change *tt_change;
2508         struct batadv_orig_node *orig_node;
2509         uint8_t my_ttvn, req_ttvn;
2510         uint16_t tvlv_len;
2511         bool full_table;
2512         int32_t tt_len;
2513
2514         batadv_dbg(BATADV_DBG_TT, bat_priv,
2515                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2516                    req_src, tt_data->ttvn,
2517                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2518
2519         spin_lock_bh(&bat_priv->tt.commit_lock);
2520
2521         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2522         req_ttvn = tt_data->ttvn;
2523
2524         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2525         if (!orig_node)
2526                 goto out;
2527
2528         primary_if = batadv_primary_if_get_selected(bat_priv);
2529         if (!primary_if)
2530                 goto out;
2531
2532         /* If the full table has been explicitly requested or the gap
2533          * is too big send the whole local translation table
2534          */
2535         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2536             !bat_priv->tt.last_changeset)
2537                 full_table = true;
2538         else
2539                 full_table = false;
2540
2541         /* TT fragmentation hasn't been implemented yet, so send as many
2542          * TT entries fit a single packet as possible only
2543          */
2544         if (!full_table) {
2545                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2546
2547                 tt_len = bat_priv->tt.last_changeset_len;
2548                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2549                                                              &tvlv_tt_data,
2550                                                              &tt_change,
2551                                                              &tt_len);
2552                 if (!tt_len)
2553                         goto unlock;
2554
2555                 /* Copy the last orig_node's OGM buffer */
2556                 memcpy(tt_change, bat_priv->tt.last_changeset,
2557                        bat_priv->tt.last_changeset_len);
2558                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2559         } else {
2560                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2561
2562                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2563                  * in the initial part
2564                  */
2565                 tt_len = -1;
2566                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2567                                                              &tvlv_tt_data,
2568                                                              &tt_change,
2569                                                              &tt_len);
2570                 if (!tt_len)
2571                         goto out;
2572
2573                 /* fill the rest of the tvlv with the real TT entries */
2574                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2575                                         tt_change, tt_len,
2576                                         batadv_tt_local_valid, NULL);
2577         }
2578
2579         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2580         tvlv_tt_data->ttvn = req_ttvn;
2581
2582         if (full_table)
2583                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2584
2585         batadv_dbg(BATADV_DBG_TT, bat_priv,
2586                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2587                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2588
2589         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2590
2591         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2592                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2593                                  tvlv_len);
2594
2595         goto out;
2596
2597 unlock:
2598         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2599 out:
2600         spin_unlock_bh(&bat_priv->tt.commit_lock);
2601         if (orig_node)
2602                 batadv_orig_node_free_ref(orig_node);
2603         if (primary_if)
2604                 batadv_hardif_free_ref(primary_if);
2605         kfree(tvlv_tt_data);
2606         /* The packet was for this host, so it doesn't need to be re-routed */
2607         return true;
2608 }
2609
2610 /**
2611  * batadv_send_tt_response - send reply to tt request
2612  * @bat_priv: the bat priv with all the soft interface information
2613  * @tt_data: tt data containing the tt request information
2614  * @req_src: mac address of tt request sender
2615  * @req_dst: mac address of tt request recipient
2616  *
2617  * Returns true if tt request reply was sent, false otherwise.
2618  */
2619 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2620                                     struct batadv_tvlv_tt_data *tt_data,
2621                                     uint8_t *req_src, uint8_t *req_dst)
2622 {
2623         if (batadv_is_my_mac(bat_priv, req_dst))
2624                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2625         else
2626                 return batadv_send_other_tt_response(bat_priv, tt_data,
2627                                                      req_src, req_dst);
2628 }
2629
2630 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2631                                       struct batadv_orig_node *orig_node,
2632                                       struct batadv_tvlv_tt_change *tt_change,
2633                                       uint16_t tt_num_changes, uint8_t ttvn)
2634 {
2635         int i;
2636         int roams;
2637
2638         for (i = 0; i < tt_num_changes; i++) {
2639                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2640                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2641                         batadv_tt_global_del(bat_priv, orig_node,
2642                                              (tt_change + i)->addr,
2643                                              ntohs((tt_change + i)->vid),
2644                                              "tt removed by changes",
2645                                              roams);
2646                 } else {
2647                         if (!batadv_tt_global_add(bat_priv, orig_node,
2648                                                   (tt_change + i)->addr,
2649                                                   ntohs((tt_change + i)->vid),
2650                                                   (tt_change + i)->flags, ttvn))
2651                                 /* In case of problem while storing a
2652                                  * global_entry, we stop the updating
2653                                  * procedure without committing the
2654                                  * ttvn change. This will avoid to send
2655                                  * corrupted data on tt_request
2656                                  */
2657                                 return;
2658                 }
2659         }
2660         orig_node->tt_initialised = true;
2661 }
2662
2663 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2664                                   struct batadv_tvlv_tt_change *tt_change,
2665                                   uint8_t ttvn, uint8_t *resp_src,
2666                                   uint16_t num_entries)
2667 {
2668         struct batadv_orig_node *orig_node;
2669
2670         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2671         if (!orig_node)
2672                 goto out;
2673
2674         /* Purge the old table first.. */
2675         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2676                                   "Received full table");
2677
2678         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2679                                   ttvn);
2680
2681         spin_lock_bh(&orig_node->tt_buff_lock);
2682         kfree(orig_node->tt_buff);
2683         orig_node->tt_buff_len = 0;
2684         orig_node->tt_buff = NULL;
2685         spin_unlock_bh(&orig_node->tt_buff_lock);
2686
2687         atomic_set(&orig_node->last_ttvn, ttvn);
2688
2689 out:
2690         if (orig_node)
2691                 batadv_orig_node_free_ref(orig_node);
2692 }
2693
2694 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2695                                      struct batadv_orig_node *orig_node,
2696                                      uint16_t tt_num_changes, uint8_t ttvn,
2697                                      struct batadv_tvlv_tt_change *tt_change)
2698 {
2699         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2700                                   tt_num_changes, ttvn);
2701
2702         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2703                                    batadv_tt_len(tt_num_changes));
2704         atomic_set(&orig_node->last_ttvn, ttvn);
2705 }
2706
2707 /**
2708  * batadv_is_my_client - check if a client is served by the local node
2709  * @bat_priv: the bat priv with all the soft interface information
2710  * @addr: the mac adress of the client to check
2711  * @vid: VLAN identifier
2712  *
2713  * Returns true if the client is served by this node, false otherwise.
2714  */
2715 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2716                          unsigned short vid)
2717 {
2718         struct batadv_tt_local_entry *tt_local_entry;
2719         bool ret = false;
2720
2721         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2722         if (!tt_local_entry)
2723                 goto out;
2724         /* Check if the client has been logically deleted (but is kept for
2725          * consistency purpose)
2726          */
2727         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2728             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2729                 goto out;
2730         ret = true;
2731 out:
2732         if (tt_local_entry)
2733                 batadv_tt_local_entry_free_ref(tt_local_entry);
2734         return ret;
2735 }
2736
2737 /**
2738  * batadv_handle_tt_response - process incoming tt reply
2739  * @bat_priv: the bat priv with all the soft interface information
2740  * @tt_data: tt data containing the tt request information
2741  * @resp_src: mac address of tt reply sender
2742  * @num_entries: number of tt change entries appended to the tt data
2743  */
2744 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2745                                       struct batadv_tvlv_tt_data *tt_data,
2746                                       uint8_t *resp_src, uint16_t num_entries)
2747 {
2748         struct batadv_tt_req_node *node, *safe;
2749         struct batadv_orig_node *orig_node = NULL;
2750         struct batadv_tvlv_tt_change *tt_change;
2751         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2752         uint16_t change_offset;
2753
2754         batadv_dbg(BATADV_DBG_TT, bat_priv,
2755                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2756                    resp_src, tt_data->ttvn, num_entries,
2757                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2758
2759         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2760         if (!orig_node)
2761                 goto out;
2762
2763         spin_lock_bh(&orig_node->tt_lock);
2764
2765         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2766         change_offset *= ntohs(tt_data->num_vlan);
2767         change_offset += sizeof(*tt_data);
2768         tvlv_ptr += change_offset;
2769
2770         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2771         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2772                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2773                                       resp_src, num_entries);
2774         } else {
2775                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2776                                          tt_data->ttvn, tt_change);
2777         }
2778
2779         /* Recalculate the CRC for this orig_node and store it */
2780         batadv_tt_global_update_crc(bat_priv, orig_node);
2781
2782         spin_unlock_bh(&orig_node->tt_lock);
2783
2784         /* Delete the tt_req_node from pending tt_requests list */
2785         spin_lock_bh(&bat_priv->tt.req_list_lock);
2786         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2787                 if (!batadv_compare_eth(node->addr, resp_src))
2788                         continue;
2789                 list_del(&node->list);
2790                 kfree(node);
2791         }
2792
2793         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2794 out:
2795         if (orig_node)
2796                 batadv_orig_node_free_ref(orig_node);
2797 }
2798
2799 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2800 {
2801         struct batadv_tt_roam_node *node, *safe;
2802
2803         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2804
2805         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2806                 list_del(&node->list);
2807                 kfree(node);
2808         }
2809
2810         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2811 }
2812
2813 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2814 {
2815         struct batadv_tt_roam_node *node, *safe;
2816
2817         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2818         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2819                 if (!batadv_has_timed_out(node->first_time,
2820                                           BATADV_ROAMING_MAX_TIME))
2821                         continue;
2822
2823                 list_del(&node->list);
2824                 kfree(node);
2825         }
2826         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2827 }
2828
2829 /* This function checks whether the client already reached the
2830  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2831  * will not be sent.
2832  *
2833  * returns true if the ROAMING_ADV can be sent, false otherwise
2834  */
2835 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2836                                        uint8_t *client)
2837 {
2838         struct batadv_tt_roam_node *tt_roam_node;
2839         bool ret = false;
2840
2841         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2842         /* The new tt_req will be issued only if I'm not waiting for a
2843          * reply from the same orig_node yet
2844          */
2845         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2846                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2847                         continue;
2848
2849                 if (batadv_has_timed_out(tt_roam_node->first_time,
2850                                          BATADV_ROAMING_MAX_TIME))
2851                         continue;
2852
2853                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2854                         /* Sorry, you roamed too many times! */
2855                         goto unlock;
2856                 ret = true;
2857                 break;
2858         }
2859
2860         if (!ret) {
2861                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2862                 if (!tt_roam_node)
2863                         goto unlock;
2864
2865                 tt_roam_node->first_time = jiffies;
2866                 atomic_set(&tt_roam_node->counter,
2867                            BATADV_ROAMING_MAX_COUNT - 1);
2868                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2869
2870                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2871                 ret = true;
2872         }
2873
2874 unlock:
2875         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2876         return ret;
2877 }
2878
2879 /**
2880  * batadv_send_roam_adv - send a roaming advertisement message
2881  * @bat_priv: the bat priv with all the soft interface information
2882  * @client: mac address of the roaming client
2883  * @vid: VLAN identifier
2884  * @orig_node: message destination
2885  *
2886  * Send a ROAMING_ADV message to the node which was previously serving this
2887  * client. This is done to inform the node that from now on all traffic destined
2888  * for this particular roamed client has to be forwarded to the sender of the
2889  * roaming message.
2890  */
2891 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2892                                  unsigned short vid,
2893                                  struct batadv_orig_node *orig_node)
2894 {
2895         struct batadv_hard_iface *primary_if;
2896         struct batadv_tvlv_roam_adv tvlv_roam;
2897
2898         primary_if = batadv_primary_if_get_selected(bat_priv);
2899         if (!primary_if)
2900                 goto out;
2901
2902         /* before going on we have to check whether the client has
2903          * already roamed to us too many times
2904          */
2905         if (!batadv_tt_check_roam_count(bat_priv, client))
2906                 goto out;
2907
2908         batadv_dbg(BATADV_DBG_TT, bat_priv,
2909                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2910                    orig_node->orig, client, BATADV_PRINT_VID(vid));
2911
2912         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2913
2914         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
2915         tvlv_roam.vid = htons(vid);
2916
2917         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2918                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
2919                                  &tvlv_roam, sizeof(tvlv_roam));
2920
2921 out:
2922         if (primary_if)
2923                 batadv_hardif_free_ref(primary_if);
2924 }
2925
2926 static void batadv_tt_purge(struct work_struct *work)
2927 {
2928         struct delayed_work *delayed_work;
2929         struct batadv_priv_tt *priv_tt;
2930         struct batadv_priv *bat_priv;
2931
2932         delayed_work = container_of(work, struct delayed_work, work);
2933         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2934         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2935
2936         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
2937         batadv_tt_global_purge(bat_priv);
2938         batadv_tt_req_purge(bat_priv);
2939         batadv_tt_roam_purge(bat_priv);
2940
2941         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
2942                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
2943 }
2944
2945 void batadv_tt_free(struct batadv_priv *bat_priv)
2946 {
2947         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
2948         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
2949
2950         cancel_delayed_work_sync(&bat_priv->tt.work);
2951
2952         batadv_tt_local_table_free(bat_priv);
2953         batadv_tt_global_table_free(bat_priv);
2954         batadv_tt_req_list_free(bat_priv);
2955         batadv_tt_changes_list_free(bat_priv);
2956         batadv_tt_roam_list_free(bat_priv);
2957
2958         kfree(bat_priv->tt.last_changeset);
2959 }
2960
2961 /**
2962  * batadv_tt_local_set_flags - set or unset the specified flags on the local
2963  *  table and possibly count them in the TT size
2964  * @bat_priv: the bat priv with all the soft interface information
2965  * @flags: the flag to switch
2966  * @enable: whether to set or unset the flag
2967  * @count: whether to increase the TT size by the number of changed entries
2968  */
2969 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
2970                                       uint16_t flags, bool enable, bool count)
2971 {
2972         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2973         struct batadv_tt_common_entry *tt_common_entry;
2974         uint16_t changed_num = 0;
2975         struct hlist_head *head;
2976         uint32_t i;
2977
2978         if (!hash)
2979                 return;
2980
2981         for (i = 0; i < hash->size; i++) {
2982                 head = &hash->table[i];
2983
2984                 rcu_read_lock();
2985                 hlist_for_each_entry_rcu(tt_common_entry,
2986                                          head, hash_entry) {
2987                         if (enable) {
2988                                 if ((tt_common_entry->flags & flags) == flags)
2989                                         continue;
2990                                 tt_common_entry->flags |= flags;
2991                         } else {
2992                                 if (!(tt_common_entry->flags & flags))
2993                                         continue;
2994                                 tt_common_entry->flags &= ~flags;
2995                         }
2996                         changed_num++;
2997
2998                         if (!count)
2999                                 continue;
3000
3001                         batadv_tt_local_size_inc(bat_priv,
3002                                                  tt_common_entry->vid);
3003                 }
3004                 rcu_read_unlock();
3005         }
3006 }
3007
3008 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3009 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3010 {
3011         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3012         struct batadv_tt_common_entry *tt_common;
3013         struct batadv_tt_local_entry *tt_local;
3014         struct hlist_node *node_tmp;
3015         struct hlist_head *head;
3016         spinlock_t *list_lock; /* protects write access to the hash lists */
3017         uint32_t i;
3018
3019         if (!hash)
3020                 return;
3021
3022         for (i = 0; i < hash->size; i++) {
3023                 head = &hash->table[i];
3024                 list_lock = &hash->list_locks[i];
3025
3026                 spin_lock_bh(list_lock);
3027                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3028                                           hash_entry) {
3029                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3030                                 continue;
3031
3032                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3033                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3034                                    tt_common->addr,
3035                                    BATADV_PRINT_VID(tt_common->vid));
3036
3037                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3038                         hlist_del_rcu(&tt_common->hash_entry);
3039                         tt_local = container_of(tt_common,
3040                                                 struct batadv_tt_local_entry,
3041                                                 common);
3042                         batadv_tt_local_entry_free_ref(tt_local);
3043                 }
3044                 spin_unlock_bh(list_lock);
3045         }
3046 }
3047
3048 /**
3049  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3050  *  which have been queued in the time since the last commit
3051  * @bat_priv: the bat priv with all the soft interface information
3052  *
3053  * Caller must hold tt->commit_lock.
3054  */
3055 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3056 {
3057         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3058                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3059                         batadv_tt_tvlv_container_update(bat_priv);
3060                 return;
3061         }
3062
3063         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3064
3065         batadv_tt_local_purge_pending_clients(bat_priv);
3066         batadv_tt_local_update_crc(bat_priv);
3067
3068         /* Increment the TTVN only once per OGM interval */
3069         atomic_inc(&bat_priv->tt.vn);
3070         batadv_dbg(BATADV_DBG_TT, bat_priv,
3071                    "Local changes committed, updating to ttvn %u\n",
3072                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3073
3074         /* reset the sending counter */
3075         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3076         batadv_tt_tvlv_container_update(bat_priv);
3077 }
3078
3079 /**
3080  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3081  *  have been queued in the time since the last commit
3082  * @bat_priv: the bat priv with all the soft interface information
3083  */
3084 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3085 {
3086         spin_lock_bh(&bat_priv->tt.commit_lock);
3087         batadv_tt_local_commit_changes_nolock(bat_priv);
3088         spin_unlock_bh(&bat_priv->tt.commit_lock);
3089 }
3090
3091 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3092                            uint8_t *dst, unsigned short vid)
3093 {
3094         struct batadv_tt_local_entry *tt_local_entry = NULL;
3095         struct batadv_tt_global_entry *tt_global_entry = NULL;
3096         struct batadv_softif_vlan *vlan;
3097         bool ret = false;
3098
3099         vlan = batadv_softif_vlan_get(bat_priv, vid);
3100         if (!vlan || !atomic_read(&vlan->ap_isolation))
3101                 goto out;
3102
3103         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3104         if (!tt_local_entry)
3105                 goto out;
3106
3107         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3108         if (!tt_global_entry)
3109                 goto out;
3110
3111         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3112                 goto out;
3113
3114         ret = true;
3115
3116 out:
3117         if (vlan)
3118                 batadv_softif_vlan_free_ref(vlan);
3119         if (tt_global_entry)
3120                 batadv_tt_global_entry_free_ref(tt_global_entry);
3121         if (tt_local_entry)
3122                 batadv_tt_local_entry_free_ref(tt_local_entry);
3123         return ret;
3124 }
3125
3126 /**
3127  * batadv_tt_update_orig - update global translation table with new tt
3128  *  information received via ogms
3129  * @bat_priv: the bat priv with all the soft interface information
3130  * @orig: the orig_node of the ogm
3131  * @tt_vlan: pointer to the first tvlv VLAN entry
3132  * @tt_num_vlan: number of tvlv VLAN entries
3133  * @tt_change: pointer to the first entry in the TT buffer
3134  * @tt_num_changes: number of tt changes inside the tt buffer
3135  * @ttvn: translation table version number of this changeset
3136  * @tt_crc: crc32 checksum of orig node's translation table
3137  */
3138 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3139                                   struct batadv_orig_node *orig_node,
3140                                   const void *tt_buff, uint16_t tt_num_vlan,
3141                                   struct batadv_tvlv_tt_change *tt_change,
3142                                   uint16_t tt_num_changes, uint8_t ttvn)
3143 {
3144         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3145         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3146         bool full_table = true;
3147
3148         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3149         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3150          * increased by one -> we can apply the attached changes
3151          */
3152         if ((!orig_node->tt_initialised && ttvn == 1) ||
3153             ttvn - orig_ttvn == 1) {
3154                 /* the OGM could not contain the changes due to their size or
3155                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3156                  * times.
3157                  * In this case send a tt request
3158                  */
3159                 if (!tt_num_changes) {
3160                         full_table = false;
3161                         goto request_table;
3162                 }
3163
3164                 spin_lock_bh(&orig_node->tt_lock);
3165
3166                 tt_change = (struct batadv_tvlv_tt_change *)tt_buff;
3167                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3168                                          ttvn, tt_change);
3169
3170                 /* Even if we received the precomputed crc with the OGM, we
3171                  * prefer to recompute it to spot any possible inconsistency
3172                  * in the global table
3173                  */
3174                 batadv_tt_global_update_crc(bat_priv, orig_node);
3175
3176                 spin_unlock_bh(&orig_node->tt_lock);
3177
3178                 /* The ttvn alone is not enough to guarantee consistency
3179                  * because a single value could represent different states
3180                  * (due to the wrap around). Thus a node has to check whether
3181                  * the resulting table (after applying the changes) is still
3182                  * consistent or not. E.g. a node could disconnect while its
3183                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3184                  * checking the CRC value is mandatory to detect the
3185                  * inconsistency
3186                  */
3187                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3188                                                 tt_num_vlan))
3189                         goto request_table;
3190         } else {
3191                 /* if we missed more than one change or our tables are not
3192                  * in sync anymore -> request fresh tt data
3193                  */
3194                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
3195                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3196                                                 tt_num_vlan)) {
3197 request_table:
3198                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3199                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3200                                    orig_node->orig, ttvn, orig_ttvn,
3201                                    tt_num_changes);
3202                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3203                                                tt_vlan, tt_num_vlan,
3204                                                full_table);
3205                         return;
3206                 }
3207         }
3208 }
3209
3210 /**
3211  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3212  * @bat_priv: the bat priv with all the soft interface information
3213  * @addr: the mac address of the client to check
3214  * @vid: VLAN identifier
3215  *
3216  * Returns true if we know that the client has moved from its old originator
3217  * to another one. This entry is still kept for consistency purposes and will be
3218  * deleted later by a DEL or because of timeout
3219  */
3220 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3221                                         uint8_t *addr, unsigned short vid)
3222 {
3223         struct batadv_tt_global_entry *tt_global_entry;
3224         bool ret = false;
3225
3226         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3227         if (!tt_global_entry)
3228                 goto out;
3229
3230         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3231         batadv_tt_global_entry_free_ref(tt_global_entry);
3232 out:
3233         return ret;
3234 }
3235
3236 /**
3237  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3238  * @bat_priv: the bat priv with all the soft interface information
3239  * @addr: the mac address of the local client to query
3240  * @vid: VLAN identifier
3241  *
3242  * Returns true if the local client is known to be roaming (it is not served by
3243  * this node anymore) or not. If yes, the client is still present in the table
3244  * to keep the latter consistent with the node TTVN
3245  */
3246 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3247                                        uint8_t *addr, unsigned short vid)
3248 {
3249         struct batadv_tt_local_entry *tt_local_entry;
3250         bool ret = false;
3251
3252         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3253         if (!tt_local_entry)
3254                 goto out;
3255
3256         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3257         batadv_tt_local_entry_free_ref(tt_local_entry);
3258 out:
3259         return ret;
3260 }
3261
3262 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3263                                           struct batadv_orig_node *orig_node,
3264                                           const unsigned char *addr,
3265                                           unsigned short vid)
3266 {
3267         bool ret = false;
3268
3269         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3270                                   BATADV_TT_CLIENT_TEMP,
3271                                   atomic_read(&orig_node->last_ttvn)))
3272                 goto out;
3273
3274         batadv_dbg(BATADV_DBG_TT, bat_priv,
3275                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3276                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3277         ret = true;
3278 out:
3279         return ret;
3280 }
3281
3282 /**
3283  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3284  *  maximum packet size that can be transported through the mesh
3285  * @soft_iface: netdev struct of the mesh interface
3286  *
3287  * Remove entries older than 'timeout' and half timeout if more entries need
3288  * to be removed.
3289  */
3290 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3291 {
3292         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3293         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3294         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3295         bool reduced = false;
3296
3297         spin_lock_bh(&bat_priv->tt.commit_lock);
3298
3299         while (true) {
3300                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3301                 if (packet_size_max >= table_size)
3302                         break;
3303
3304                 batadv_tt_local_purge(bat_priv, timeout);
3305                 batadv_tt_local_purge_pending_clients(bat_priv);
3306
3307                 timeout /= 2;
3308                 reduced = true;
3309                 net_ratelimited_function(batadv_info, soft_iface,
3310                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3311                                          packet_size_max);
3312         }
3313
3314         /* commit these changes immediately, to avoid synchronization problem
3315          * with the TTVN
3316          */
3317         if (reduced)
3318                 batadv_tt_local_commit_changes_nolock(bat_priv);
3319
3320         spin_unlock_bh(&bat_priv->tt.commit_lock);
3321 }
3322
3323 /**
3324  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3325  * @bat_priv: the bat priv with all the soft interface information
3326  * @orig: the orig_node of the ogm
3327  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3328  * @tvlv_value: tvlv buffer containing the gateway data
3329  * @tvlv_value_len: tvlv buffer length
3330  */
3331 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3332                                           struct batadv_orig_node *orig,
3333                                           uint8_t flags, void *tvlv_value,
3334                                           uint16_t tvlv_value_len)
3335 {
3336         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3337         struct batadv_tvlv_tt_change *tt_change;
3338         struct batadv_tvlv_tt_data *tt_data;
3339         uint16_t num_entries, num_vlan;
3340
3341         if (tvlv_value_len < sizeof(*tt_data))
3342                 return;
3343
3344         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3345         tvlv_value_len -= sizeof(*tt_data);
3346
3347         num_vlan = ntohs(tt_data->num_vlan);
3348
3349         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3350                 return;
3351
3352         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3353         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3354         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3355
3356         num_entries = batadv_tt_entries(tvlv_value_len);
3357
3358         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3359                               num_entries, tt_data->ttvn);
3360 }
3361
3362 /**
3363  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3364  *  container
3365  * @bat_priv: the bat priv with all the soft interface information
3366  * @src: mac address of tt tvlv sender
3367  * @dst: mac address of tt tvlv recipient
3368  * @tvlv_value: tvlv buffer containing the tt data
3369  * @tvlv_value_len: tvlv buffer length
3370  *
3371  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3372  * otherwise.
3373  */
3374 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3375                                              uint8_t *src, uint8_t *dst,
3376                                              void *tvlv_value,
3377                                              uint16_t tvlv_value_len)
3378 {
3379         struct batadv_tvlv_tt_data *tt_data;
3380         uint16_t tt_vlan_len, tt_num_entries;
3381         char tt_flag;
3382         bool ret;
3383
3384         if (tvlv_value_len < sizeof(*tt_data))
3385                 return NET_RX_SUCCESS;
3386
3387         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3388         tvlv_value_len -= sizeof(*tt_data);
3389
3390         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3391         tt_vlan_len *= ntohs(tt_data->num_vlan);
3392
3393         if (tvlv_value_len < tt_vlan_len)
3394                 return NET_RX_SUCCESS;
3395
3396         tvlv_value_len -= tt_vlan_len;
3397         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3398
3399         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3400         case BATADV_TT_REQUEST:
3401                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3402
3403                 /* If this node cannot provide a TT response the tt_request is
3404                  * forwarded
3405                  */
3406                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3407                 if (!ret) {
3408                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3409                                 tt_flag = 'F';
3410                         else
3411                                 tt_flag = '.';
3412
3413                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3414                                    "Routing TT_REQUEST to %pM [%c]\n",
3415                                    dst, tt_flag);
3416                         /* tvlv API will re-route the packet */
3417                         return NET_RX_DROP;
3418                 }
3419                 break;
3420         case BATADV_TT_RESPONSE:
3421                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3422
3423                 if (batadv_is_my_mac(bat_priv, dst)) {
3424                         batadv_handle_tt_response(bat_priv, tt_data,
3425                                                   src, tt_num_entries);
3426                         return NET_RX_SUCCESS;
3427                 }
3428
3429                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3430                         tt_flag =  'F';
3431                 else
3432                         tt_flag = '.';
3433
3434                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3435                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3436
3437                 /* tvlv API will re-route the packet */
3438                 return NET_RX_DROP;
3439         }
3440
3441         return NET_RX_SUCCESS;
3442 }
3443
3444 /**
3445  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3446  * @bat_priv: the bat priv with all the soft interface information
3447  * @src: mac address of tt tvlv sender
3448  * @dst: mac address of tt tvlv recipient
3449  * @tvlv_value: tvlv buffer containing the tt data
3450  * @tvlv_value_len: tvlv buffer length
3451  *
3452  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3453  * otherwise.
3454  */
3455 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3456                                                uint8_t *src, uint8_t *dst,
3457                                                void *tvlv_value,
3458                                                uint16_t tvlv_value_len)
3459 {
3460         struct batadv_tvlv_roam_adv *roaming_adv;
3461         struct batadv_orig_node *orig_node = NULL;
3462
3463         /* If this node is not the intended recipient of the
3464          * roaming advertisement the packet is forwarded
3465          * (the tvlv API will re-route the packet).
3466          */
3467         if (!batadv_is_my_mac(bat_priv, dst))
3468                 return NET_RX_DROP;
3469
3470         if (tvlv_value_len < sizeof(*roaming_adv))
3471                 goto out;
3472
3473         orig_node = batadv_orig_hash_find(bat_priv, src);
3474         if (!orig_node)
3475                 goto out;
3476
3477         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3478         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3479
3480         batadv_dbg(BATADV_DBG_TT, bat_priv,
3481                    "Received ROAMING_ADV from %pM (client %pM)\n",
3482                    src, roaming_adv->client);
3483
3484         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3485                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3486                              atomic_read(&orig_node->last_ttvn) + 1);
3487
3488 out:
3489         if (orig_node)
3490                 batadv_orig_node_free_ref(orig_node);
3491         return NET_RX_SUCCESS;
3492 }
3493
3494 /**
3495  * batadv_tt_init - initialise the translation table internals
3496  * @bat_priv: the bat priv with all the soft interface information
3497  *
3498  * Return 0 on success or negative error number in case of failure.
3499  */
3500 int batadv_tt_init(struct batadv_priv *bat_priv)
3501 {
3502         int ret;
3503
3504         ret = batadv_tt_local_init(bat_priv);
3505         if (ret < 0)
3506                 return ret;
3507
3508         ret = batadv_tt_global_init(bat_priv);
3509         if (ret < 0)
3510                 return ret;
3511
3512         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3513                                      batadv_tt_tvlv_unicast_handler_v1,
3514                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3515
3516         batadv_tvlv_handler_register(bat_priv, NULL,
3517                                      batadv_roam_tvlv_unicast_handler_v1,
3518                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3519
3520         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3521         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3522                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3523
3524         return 1;
3525 }