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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19 #include "translation-table.h"
  20 #include "soft-interface.h"
  21 #include "hard-interface.h"
  22 #include "send.h"
  23 #include "hash.h"
  24 #include "originator.h"
  25 #include "routing.h"
  26 #include "bridge_loop_avoidance.h"
  27
  28 #include <linux/crc32c.h>
  29
  30 /* hash class keys */
  31 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  32 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  33
  34 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
  35                                  unsigned short vid,
  36                                  struct batadv_orig_node *orig_node);
  37 static void batadv_tt_purge(struct work_struct *work);
  38 static void
  39 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  40 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  41                                  struct batadv_orig_node *orig_node,
  42                                  const unsigned char *addr,
  43                                  unsigned short vid, const char *message,
  44                                  bool roaming);
  45
  46 /* returns 1 if they are the same mac addr */
  47 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  48 {
  49         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  50                                          hash_entry);
  51
  52         return batadv_compare_eth(data1, data2);
  53 }
  54
  55 /**
  56  * batadv_choose_tt - return the index of the tt entry in the hash table
  57  * @data: pointer to the tt_common_entry object to map
  58  * @size: the size of the hash table
  59  *
  60  * Returns the hash index where the object represented by 'data' should be
  61  * stored at.
  62  */
  63 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
  64 {
  65         struct batadv_tt_common_entry *tt;
  66         uint32_t hash = 0;
  67
  68         tt = (struct batadv_tt_common_entry *)data;
  69         hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
  70         hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
  71
  72         hash += (hash << 3);
  73         hash ^= (hash >> 11);
  74         hash += (hash << 15);
  75
  76         return hash % size;
  77 }
  78
  79 /**
  80  * batadv_tt_hash_find - look for a client in the given hash table
  81  * @hash: the hash table to search
  82  * @addr: the mac address of the client to look for
  83  * @vid: VLAN identifier
  84  *
  85  * Returns a pointer to the tt_common struct belonging to the searched client if
  86  * found, NULL otherwise.
  87  */
  88 static struct batadv_tt_common_entry *
  89 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
  90                     unsigned short vid)
  91 {
  92         struct hlist_head *head;
  93         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
  94         uint32_t index;
  95
  96         if (!hash)
  97                 return NULL;
  98
  99         memcpy(to_search.addr, addr, ETH_ALEN);
 100         to_search.vid = vid;
 101
 102         index = batadv_choose_tt(&to_search, hash->size);
 103         head = &hash->table[index];
 104
 105         rcu_read_lock();
 106         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 107                 if (!batadv_compare_eth(tt, addr))
 108                         continue;
 109
 110                 if (tt->vid != vid)
 111                         continue;
 112
 113                 if (!atomic_inc_not_zero(&tt->refcount))
 114                         continue;
 115
 116                 tt_tmp = tt;
 117                 break;
 118         }
 119         rcu_read_unlock();
 120
 121         return tt_tmp;
 122 }
 123
 124 /**
 125  * batadv_tt_local_hash_find - search the local table for a given client
 126  * @bat_priv: the bat priv with all the soft interface information
 127  * @addr: the mac address of the client to look for
 128  * @vid: VLAN identifier
 129  *
 130  * Returns a pointer to the corresponding tt_local_entry struct if the client is
 131  * found, NULL otherwise.
 132  */
 133 static struct batadv_tt_local_entry *
 134 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 135                           unsigned short vid)
 136 {
 137         struct batadv_tt_common_entry *tt_common_entry;
 138         struct batadv_tt_local_entry *tt_local_entry = NULL;
 139
 140         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 141                                               vid);
 142         if (tt_common_entry)
 143                 tt_local_entry = container_of(tt_common_entry,
 144                                               struct batadv_tt_local_entry,
 145                                               common);
 146         return tt_local_entry;
 147 }
 148
 149 /**
 150  * batadv_tt_global_hash_find - search the global table for a given client
 151  * @bat_priv: the bat priv with all the soft interface information
 152  * @addr: the mac address of the client to look for
 153  * @vid: VLAN identifier
 154  *
 155  * Returns a pointer to the corresponding tt_global_entry struct if the client
 156  * is found, NULL otherwise.
 157  */
 158 static struct batadv_tt_global_entry *
 159 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 160                            unsigned short vid)
 161 {
 162         struct batadv_tt_common_entry *tt_common_entry;
 163         struct batadv_tt_global_entry *tt_global_entry = NULL;
 164
 165         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 166                                               vid);
 167         if (tt_common_entry)
 168                 tt_global_entry = container_of(tt_common_entry,
 169                                                struct batadv_tt_global_entry,
 170                                                common);
 171         return tt_global_entry;
 172 }
 173
 174 static void
 175 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 176 {
 177         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 178                 kfree_rcu(tt_local_entry, common.rcu);
 179 }
 180
 181 /**
 182  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
 183  *  tt_global_entry and possibly free it
 184  * @tt_global_entry: the object to free
 185  */
 186 static void
 187 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 188 {
 189         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 190                 batadv_tt_global_del_orig_list(tt_global_entry);
 191                 kfree_rcu(tt_global_entry, common.rcu);
 192         }
 193 }
 194
 195 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 196 {
 197         struct batadv_tt_orig_list_entry *orig_entry;
 198
 199         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 200
 201         /* We are in an rcu callback here, therefore we cannot use
 202          * batadv_orig_node_free_ref() and its call_rcu():
 203          * An rcu_barrier() wouldn't wait for that to finish
 204          */
 205         batadv_orig_node_free_ref_now(orig_entry->orig_node);
 206         kfree(orig_entry);
 207 }
 208
 209 /**
 210  * batadv_tt_local_size_mod - change the size by v of the local table identified
 211  *  by vid
 212  * @bat_priv: the bat priv with all the soft interface information
 213  * @vid: the VLAN identifier of the sub-table to change
 214  * @v: the amount to sum to the local table size
 215  */
 216 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 217                                      unsigned short vid, int v)
 218 {
 219         struct batadv_softif_vlan *vlan;
 220
 221         vlan = batadv_softif_vlan_get(bat_priv, vid);
 222         if (!vlan)
 223                 return;
 224
 225         atomic_add(v, &vlan->tt.num_entries);
 226
 227         batadv_softif_vlan_free_ref(vlan);
 228 }
 229
 230 /**
 231  * batadv_tt_local_size_inc - increase by one the local table size for the given
 232  *  vid
 233  * @bat_priv: the bat priv with all the soft interface information
 234  * @vid: the VLAN identifier
 235  */
 236 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 237                                      unsigned short vid)
 238 {
 239         batadv_tt_local_size_mod(bat_priv, vid, 1);
 240 }
 241
 242 /**
 243  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 244  *  vid
 245  * @bat_priv: the bat priv with all the soft interface information
 246  * @vid: the VLAN identifier
 247  */
 248 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 249                                      unsigned short vid)
 250 {
 251         batadv_tt_local_size_mod(bat_priv, vid, -1);
 252 }
 253
 254 /**
 255  * batadv_tt_global_size_mod - change the size by v of the local table
 256  *  identified by vid
 257  * @bat_priv: the bat priv with all the soft interface information
 258  * @vid: the VLAN identifier
 259  * @v: the amount to sum to the global table size
 260  */
 261 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 262                                       unsigned short vid, int v)
 263 {
 264         struct batadv_orig_node_vlan *vlan;
 265
 266         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 267         if (!vlan)
 268                 return;
 269
 270         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 271                 spin_lock_bh(&orig_node->vlan_list_lock);
 272                 list_del_rcu(&vlan->list);
 273                 spin_unlock_bh(&orig_node->vlan_list_lock);
 274                 batadv_orig_node_vlan_free_ref(vlan);
 275         }
 276
 277         batadv_orig_node_vlan_free_ref(vlan);
 278 }
 279
 280 /**
 281  * batadv_tt_global_size_inc - increase by one the global table size for the
 282  *  given vid
 283  * @orig_node: the originator which global table size has to be decreased
 284  * @vid: the vlan identifier
 285  */
 286 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 287                                       unsigned short vid)
 288 {
 289         batadv_tt_global_size_mod(orig_node, vid, 1);
 290 }
 291
 292 /**
 293  * batadv_tt_global_size_dec - decrease by one the global table size for the
 294  *  given vid
 295  * @orig_node: the originator which global table size has to be decreased
 296  * @vid: the vlan identifier
 297  */
 298 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 299                                       unsigned short vid)
 300 {
 301         batadv_tt_global_size_mod(orig_node, vid, -1);
 302 }
 303
 304 static void
 305 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 306 {
 307         if (!atomic_dec_and_test(&orig_entry->refcount))
 308                 return;
 309
 310         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 311 }
 312
 313 /**
 314  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 315  * @bat_priv: the bat priv with all the soft interface information
 316  * @tt_local_entry: the TT entry involved in the event
 317  * @event_flags: flags to store in the event structure
 318  */
 319 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 320                                   struct batadv_tt_local_entry *tt_local_entry,
 321                                   uint8_t event_flags)
 322 {
 323         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 324         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 325         uint8_t flags = common->flags | event_flags;
 326         bool event_removed = false;
 327         bool del_op_requested, del_op_entry;
 328
 329         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 330         if (!tt_change_node)
 331                 return;
 332
 333         tt_change_node->change.flags = flags;
 334         memset(tt_change_node->change.reserved, 0,
 335                sizeof(tt_change_node->change.reserved));
 336         memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
 337         tt_change_node->change.vid = htons(common->vid);
 338
 339         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 340
 341         /* check for ADD+DEL or DEL+ADD events */
 342         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 343         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 344                                  list) {
 345                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 346                         continue;
 347
 348                 /* DEL+ADD in the same orig interval have no effect and can be
 349                  * removed to avoid silly behaviour on the receiver side. The
 350                  * other way around (ADD+DEL) can happen in case of roaming of
 351                  * a client still in the NEW state. Roaming of NEW clients is
 352                  * now possible due to automatically recognition of "temporary"
 353                  * clients
 354                  */
 355                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 356                 if (!del_op_requested && del_op_entry)
 357                         goto del;
 358                 if (del_op_requested && !del_op_entry)
 359                         goto del;
 360
 361                 /* this is a second add in the same originator interval. It
 362                  * means that flags have been changed: update them!
 363                  */
 364                 if (!del_op_requested && !del_op_entry)
 365                         entry->change.flags = flags;
 366
 367                 continue;
 368 del:
 369                 list_del(&entry->list);
 370                 kfree(entry);
 371                 kfree(tt_change_node);
 372                 event_removed = true;
 373                 goto unlock;
 374         }
 375
 376         /* track the change in the OGMinterval list */
 377         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 378
 379 unlock:
 380         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 381
 382         if (event_removed)
 383                 atomic_dec(&bat_priv->tt.local_changes);
 384         else
 385                 atomic_inc(&bat_priv->tt.local_changes);
 386 }
 387
 388 /**
 389  * batadv_tt_len - compute length in bytes of given number of tt changes
 390  * @changes_num: number of tt changes
 391  *
 392  * Returns computed length in bytes.
 393  */
 394 static int batadv_tt_len(int changes_num)
 395 {
 396         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 397 }
 398
 399 /**
 400  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 401  * @tt_len: available space
 402  *
 403  * Returns the number of entries.
 404  */
 405 static uint16_t batadv_tt_entries(uint16_t tt_len)
 406 {
 407         return tt_len / batadv_tt_len(1);
 408 }
 409
 410 /**
 411  * batadv_tt_local_table_transmit_size - calculates the local translation table
 412  *  size when transmitted over the air
 413  * @bat_priv: the bat priv with all the soft interface information
 414  *
 415  * Returns local translation table size in bytes.
 416  */
 417 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 418 {
 419         uint16_t num_vlan = 0, tt_local_entries = 0;
 420         struct batadv_softif_vlan *vlan;
 421         int hdr_size;
 422
 423         rcu_read_lock();
 424         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 425                 num_vlan++;
 426                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 427         }
 428         rcu_read_unlock();
 429
 430         /* header size of tvlv encapsulated tt response payload */
 431         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 432         hdr_size += sizeof(struct batadv_tvlv_hdr);
 433         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 434         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 435
 436         return hdr_size + batadv_tt_len(tt_local_entries);
 437 }
 438
 439 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 440 {
 441         if (bat_priv->tt.local_hash)
 442                 return 0;
 443
 444         bat_priv->tt.local_hash = batadv_hash_new(1024);
 445
 446         if (!bat_priv->tt.local_hash)
 447                 return -ENOMEM;
 448
 449         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 450                                    &batadv_tt_local_hash_lock_class_key);
 451
 452         return 0;
 453 }
 454
 455 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 456                                   struct batadv_tt_global_entry *tt_global,
 457                                   const char *message)
 458 {
 459         batadv_dbg(BATADV_DBG_TT, bat_priv,
 460                    "Deleting global tt entry %pM (vid: %d): %s\n",
 461                    tt_global->common.addr,
 462                    BATADV_PRINT_VID(tt_global->common.vid), message);
 463
 464         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 465                            batadv_choose_tt, &tt_global->common);
 466         batadv_tt_global_entry_free_ref(tt_global);
 467 }
 468
 469 /**
 470  * batadv_tt_local_add - add a new client to the local table or update an
 471  *  existing client
 472  * @soft_iface: netdev struct of the mesh interface
 473  * @addr: the mac address of the client to add
 474  * @vid: VLAN identifier
 475  * @ifindex: index of the interface where the client is connected to (useful to
 476  *  identify wireless clients)
 477  * @mark: the value contained in the skb->mark field of the received packet (if
 478  *  any)
 479  *
 480  * Returns true if the client was successfully added, false otherwise.
 481  */
 482 bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 483                          unsigned short vid, int ifindex, uint32_t mark)
 484 {
 485         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 486         struct batadv_tt_local_entry *tt_local;
 487         struct batadv_tt_global_entry *tt_global;
 488         struct net_device *in_dev = NULL;
 489         struct hlist_head *head;
 490         struct batadv_tt_orig_list_entry *orig_entry;
 491         int hash_added, table_size, packet_size_max;
 492         bool ret = false, roamed_back = false;
 493         uint8_t remote_flags;
 494         uint32_t match_mark;
 495
 496         if (ifindex != BATADV_NULL_IFINDEX)
 497                 in_dev = dev_get_by_index(&init_net, ifindex);
 498
 499         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 500         tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 501
 502         if (tt_local) {
 503                 tt_local->last_seen = jiffies;
 504                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 505                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 506                                    "Re-adding pending client %pM (vid: %d)\n",
 507                                    addr, BATADV_PRINT_VID(vid));
 508                         /* whatever the reason why the PENDING flag was set,
 509                          * this is a client which was enqueued to be removed in
 510                          * this orig_interval. Since it popped up again, the
 511                          * flag can be reset like it was never enqueued
 512                          */
 513                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 514                         goto add_event;
 515                 }
 516
 517                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 518                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 519                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 520                                    addr, BATADV_PRINT_VID(vid));
 521                         /* the ROAM flag is set because this client roamed away
 522                          * and the node got a roaming_advertisement message. Now
 523                          * that the client popped up again at its original
 524                          * location such flag can be unset
 525                          */
 526                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 527                         roamed_back = true;
 528                 }
 529                 goto check_roaming;
 530         }
 531
 532         /* Ignore the client if we cannot send it in a full table response. */
 533         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 534         table_size += batadv_tt_len(1);
 535         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 536         if (table_size > packet_size_max) {
 537                 net_ratelimited_function(batadv_info, soft_iface,
 538                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 539                                          table_size, packet_size_max, addr);
 540                 goto out;
 541         }
 542
 543         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
 544         if (!tt_local)
 545                 goto out;
 546
 547         batadv_dbg(BATADV_DBG_TT, bat_priv,
 548                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 549                    addr, BATADV_PRINT_VID(vid),
 550                    (uint8_t)atomic_read(&bat_priv->tt.vn));
 551
 552         memcpy(tt_local->common.addr, addr, ETH_ALEN);
 553         /* The local entry has to be marked as NEW to avoid to send it in
 554          * a full table response going out before the next ttvn increment
 555          * (consistency check)
 556          */
 557         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 558         tt_local->common.vid = vid;
 559         if (batadv_is_wifi_netdev(in_dev))
 560                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 561         atomic_set(&tt_local->common.refcount, 2);
 562         tt_local->last_seen = jiffies;
 563         tt_local->common.added_at = tt_local->last_seen;
 564
 565         /* the batman interface mac address should never be purged */
 566         if (batadv_compare_eth(addr, soft_iface->dev_addr))
 567                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 568
 569         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 570                                      batadv_choose_tt, &tt_local->common,
 571                                      &tt_local->common.hash_entry);
 572
 573         if (unlikely(hash_added != 0)) {
 574                 /* remove the reference for the hash */
 575                 batadv_tt_local_entry_free_ref(tt_local);
 576                 goto out;
 577         }
 578
 579 add_event:
 580         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 581
 582 check_roaming:
 583         /* Check whether it is a roaming, but don't do anything if the roaming
 584          * process has already been handled
 585          */
 586         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 587                 /* These node are probably going to update their tt table */
 588                 head = &tt_global->orig_list;
 589                 rcu_read_lock();
 590                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 591                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 592                                              tt_global->common.vid,
 593                                              orig_entry->orig_node);
 594                 }
 595                 rcu_read_unlock();
 596                 if (roamed_back) {
 597                         batadv_tt_global_free(bat_priv, tt_global,
 598                                               "Roaming canceled");
 599                         tt_global = NULL;
 600                 } else {
 601                         /* The global entry has to be marked as ROAMING and
 602                          * has to be kept for consistency purpose
 603                          */
 604                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 605                         tt_global->roam_at = jiffies;
 606                 }
 607         }
 608
 609         /* store the current remote flags before altering them. This helps
 610          * understanding is flags are changing or not
 611          */
 612         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 613
 614         if (batadv_is_wifi_netdev(in_dev))
 615                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 616         else
 617                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 618
 619         /* check the mark in the skb: if it's equal to the configured
 620          * isolation_mark, it means the packet is coming from an isolated
 621          * non-mesh client
 622          */
 623         match_mark = (mark & bat_priv->isolation_mark_mask);
 624         if (bat_priv->isolation_mark_mask &&
 625             match_mark == bat_priv->isolation_mark)
 626                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 627         else
 628                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 629
 630         /* if any "dynamic" flag has been modified, resend an ADD event for this
 631          * entry so that all the nodes can get the new flags
 632          */
 633         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 634                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 635
 636         ret = true;
 637 out:
 638         if (in_dev)
 639                 dev_put(in_dev);
 640         if (tt_local)
 641                 batadv_tt_local_entry_free_ref(tt_local);
 642         if (tt_global)
 643                 batadv_tt_global_entry_free_ref(tt_global);
 644         return ret;
 645 }
 646
 647 /**
 648  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 649  *  within a TT Response directed to another node
 650  * @orig_node: originator for which the TT data has to be prepared
 651  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 652  * @tt_change: uninitialised pointer to the address of the area where the TT
 653  *  changed can be stored
 654  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 655  *  function reserves the amount of space needed to send the entire global TT
 656  *  table. In case of success the value is updated with the real amount of
 657  *  reserved bytes
 658
 659  * Allocate the needed amount of memory for the entire TT TVLV and write its
 660  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 661  * objects, one per active VLAN served by the originator node.
 662  *
 663  * Return the size of the allocated buffer or 0 in case of failure.
 664  */
 665 static uint16_t
 666 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 667                                    struct batadv_tvlv_tt_data **tt_data,
 668                                    struct batadv_tvlv_tt_change **tt_change,
 669                                    int32_t *tt_len)
 670 {
 671         uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
 672         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 673         struct batadv_orig_node_vlan *vlan;
 674         uint8_t *tt_change_ptr;
 675
 676         rcu_read_lock();
 677         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 678                 num_vlan++;
 679                 num_entries += atomic_read(&vlan->tt.num_entries);
 680         }
 681
 682         change_offset = sizeof(**tt_data);
 683         change_offset += num_vlan * sizeof(*tt_vlan);
 684
 685         /* if tt_len is negative, allocate the space needed by the full table */
 686         if (*tt_len < 0)
 687                 *tt_len = batadv_tt_len(num_entries);
 688
 689         tvlv_len = *tt_len;
 690         tvlv_len += change_offset;
 691
 692         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 693         if (!*tt_data) {
 694                 *tt_len = 0;
 695                 goto out;
 696         }
 697
 698         (*tt_data)->flags = BATADV_NO_FLAGS;
 699         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 700         (*tt_data)->num_vlan = htons(num_vlan);
 701
 702         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 703         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 704                 tt_vlan->vid = htons(vlan->vid);
 705                 tt_vlan->crc = htonl(vlan->tt.crc);
 706
 707                 tt_vlan++;
 708         }
 709
 710         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 711         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 712
 713 out:
 714         rcu_read_unlock();
 715         return tvlv_len;
 716 }
 717
 718 /**
 719  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 720  *  node
 721  * @bat_priv: the bat priv with all the soft interface information
 722  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 723  * @tt_change: uninitialised pointer to the address of the area where the TT
 724  *  changes can be stored
 725  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 726  *  function reserves the amount of space needed to send the entire local TT
 727  *  table. In case of success the value is updated with the real amount of
 728  *  reserved bytes
 729  *
 730  * Allocate the needed amount of memory for the entire TT TVLV and write its
 731  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 732  * objects, one per active VLAN.
 733  *
 734  * Return the size of the allocated buffer or 0 in case of failure.
 735  */
 736 static uint16_t
 737 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 738                                   struct batadv_tvlv_tt_data **tt_data,
 739                                   struct batadv_tvlv_tt_change **tt_change,
 740                                   int32_t *tt_len)
 741 {
 742         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 743         struct batadv_softif_vlan *vlan;
 744         uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
 745         uint8_t *tt_change_ptr;
 746         int change_offset;
 747
 748         rcu_read_lock();
 749         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 750                 num_vlan++;
 751                 num_entries += atomic_read(&vlan->tt.num_entries);
 752         }
 753
 754         change_offset = sizeof(**tt_data);
 755         change_offset += num_vlan * sizeof(*tt_vlan);
 756
 757         /* if tt_len is negative, allocate the space needed by the full table */
 758         if (*tt_len < 0)
 759                 *tt_len = batadv_tt_len(num_entries);
 760
 761         tvlv_len = *tt_len;
 762         tvlv_len += change_offset;
 763
 764         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 765         if (!*tt_data) {
 766                 tvlv_len = 0;
 767                 goto out;
 768         }
 769
 770         (*tt_data)->flags = BATADV_NO_FLAGS;
 771         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 772         (*tt_data)->num_vlan = htons(num_vlan);
 773
 774         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 775         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 776                 tt_vlan->vid = htons(vlan->vid);
 777                 tt_vlan->crc = htonl(vlan->tt.crc);
 778
 779                 tt_vlan++;
 780         }
 781
 782         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 783         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 784
 785 out:
 786         rcu_read_unlock();
 787         return tvlv_len;
 788 }
 789
 790 /**
 791  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 792  *  after local tt changes have been committed
 793  * @bat_priv: the bat priv with all the soft interface information
 794  */
 795 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 796 {
 797         struct batadv_tt_change_node *entry, *safe;
 798         struct batadv_tvlv_tt_data *tt_data;
 799         struct batadv_tvlv_tt_change *tt_change;
 800         int tt_diff_len, tt_change_len = 0;
 801         int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
 802         uint16_t tvlv_len;
 803
 804         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 805         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 806
 807         /* if we have too many changes for one packet don't send any
 808          * and wait for the tt table request which will be fragmented
 809          */
 810         if (tt_diff_len > bat_priv->soft_iface->mtu)
 811                 tt_diff_len = 0;
 812
 813         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 814                                                      &tt_change, &tt_diff_len);
 815         if (!tvlv_len)
 816                 return;
 817
 818         tt_data->flags = BATADV_TT_OGM_DIFF;
 819
 820         if (tt_diff_len == 0)
 821                 goto container_register;
 822
 823         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 824         atomic_set(&bat_priv->tt.local_changes, 0);
 825
 826         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 827                                  list) {
 828                 if (tt_diff_entries_count < tt_diff_entries_num) {
 829                         memcpy(tt_change + tt_diff_entries_count,
 830                                &entry->change,
 831                                sizeof(struct batadv_tvlv_tt_change));
 832                         tt_diff_entries_count++;
 833                 }
 834                 list_del(&entry->list);
 835                 kfree(entry);
 836         }
 837         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 838
 839         /* Keep the buffer for possible tt_request */
 840         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 841         kfree(bat_priv->tt.last_changeset);
 842         bat_priv->tt.last_changeset_len = 0;
 843         bat_priv->tt.last_changeset = NULL;
 844         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 845         /* check whether this new OGM has no changes due to size problems */
 846         if (tt_diff_entries_count > 0) {
 847                 /* if kmalloc() fails we will reply with the full table
 848                  * instead of providing the diff
 849                  */
 850                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 851                 if (bat_priv->tt.last_changeset) {
 852                         memcpy(bat_priv->tt.last_changeset,
 853                                tt_change, tt_change_len);
 854                         bat_priv->tt.last_changeset_len = tt_diff_len;
 855                 }
 856         }
 857         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 858
 859 container_register:
 860         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 861                                        tvlv_len);
 862         kfree(tt_data);
 863 }
 864
 865 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 866 {
 867         struct net_device *net_dev = (struct net_device *)seq->private;
 868         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 869         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 870         struct batadv_tt_common_entry *tt_common_entry;
 871         struct batadv_tt_local_entry *tt_local;
 872         struct batadv_hard_iface *primary_if;
 873         struct batadv_softif_vlan *vlan;
 874         struct hlist_head *head;
 875         unsigned short vid;
 876         uint32_t i;
 877         int last_seen_secs;
 878         int last_seen_msecs;
 879         unsigned long last_seen_jiffies;
 880         bool no_purge;
 881         uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
 882
 883         primary_if = batadv_seq_print_text_primary_if_get(seq);
 884         if (!primary_if)
 885                 goto out;
 886
 887         seq_printf(seq,
 888                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 889                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
 890         seq_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
 891                    "Flags", "Last seen", "CRC");
 892
 893         for (i = 0; i < hash->size; i++) {
 894                 head = &hash->table[i];
 895
 896                 rcu_read_lock();
 897                 hlist_for_each_entry_rcu(tt_common_entry,
 898                                          head, hash_entry) {
 899                         tt_local = container_of(tt_common_entry,
 900                                                 struct batadv_tt_local_entry,
 901                                                 common);
 902                         vid = tt_common_entry->vid;
 903                         last_seen_jiffies = jiffies - tt_local->last_seen;
 904                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 905                         last_seen_secs = last_seen_msecs / 1000;
 906                         last_seen_msecs = last_seen_msecs % 1000;
 907
 908                         no_purge = tt_common_entry->flags & np_flag;
 909
 910                         vlan = batadv_softif_vlan_get(bat_priv, vid);
 911                         if (!vlan) {
 912                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
 913                                            BATADV_PRINT_VID(vid));
 914                                 continue;
 915                         }
 916
 917                         seq_printf(seq,
 918                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 919                                    tt_common_entry->addr,
 920                                    BATADV_PRINT_VID(tt_common_entry->vid),
 921                                    (tt_common_entry->flags &
 922                                     BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 923                                    no_purge ? 'P' : '.',
 924                                    (tt_common_entry->flags &
 925                                     BATADV_TT_CLIENT_NEW ? 'N' : '.'),
 926                                    (tt_common_entry->flags &
 927                                     BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
 928                                    (tt_common_entry->flags &
 929                                     BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 930                                    (tt_common_entry->flags &
 931                                     BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
 932                                    no_purge ? 0 : last_seen_secs,
 933                                    no_purge ? 0 : last_seen_msecs,
 934                                    vlan->tt.crc);
 935
 936                         batadv_softif_vlan_free_ref(vlan);
 937                 }
 938                 rcu_read_unlock();
 939         }
 940 out:
 941         if (primary_if)
 942                 batadv_hardif_free_ref(primary_if);
 943         return 0;
 944 }
 945
 946 static void
 947 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
 948                             struct batadv_tt_local_entry *tt_local_entry,
 949                             uint16_t flags, const char *message)
 950 {
 951         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
 952
 953         /* The local client has to be marked as "pending to be removed" but has
 954          * to be kept in the table in order to send it in a full table
 955          * response issued before the net ttvn increment (consistency check)
 956          */
 957         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
 958
 959         batadv_dbg(BATADV_DBG_TT, bat_priv,
 960                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
 961                    tt_local_entry->common.addr,
 962                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
 963 }
 964
 965 /**
 966  * batadv_tt_local_remove - logically remove an entry from the local table
 967  * @bat_priv: the bat priv with all the soft interface information
 968  * @addr: the MAC address of the client to remove
 969  * @vid: VLAN identifier
 970  * @message: message to append to the log on deletion
 971  * @roaming: true if the deletion is due to a roaming event
 972  *
 973  * Returns the flags assigned to the local entry before being deleted
 974  */
 975 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
 976                                 const uint8_t *addr, unsigned short vid,
 977                                 const char *message, bool roaming)
 978 {
 979         struct batadv_tt_local_entry *tt_local_entry;
 980         uint16_t flags, curr_flags = BATADV_NO_FLAGS;
 981
 982         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
 983         if (!tt_local_entry)
 984                 goto out;
 985
 986         curr_flags = tt_local_entry->common.flags;
 987
 988         flags = BATADV_TT_CLIENT_DEL;
 989         /* if this global entry addition is due to a roaming, the node has to
 990          * mark the local entry as "roamed" in order to correctly reroute
 991          * packets later
 992          */
 993         if (roaming) {
 994                 flags |= BATADV_TT_CLIENT_ROAM;
 995                 /* mark the local client as ROAMed */
 996                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
 997         }
 998
 999         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1000                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1001                                             message);
1002                 goto out;
1003         }
1004         /* if this client has been added right now, it is possible to
1005          * immediately purge it
1006          */
1007         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1008         hlist_del_rcu(&tt_local_entry->common.hash_entry);
1009         batadv_tt_local_entry_free_ref(tt_local_entry);
1010
1011 out:
1012         if (tt_local_entry)
1013                 batadv_tt_local_entry_free_ref(tt_local_entry);
1014
1015         return curr_flags;
1016 }
1017
1018 /**
1019  * batadv_tt_local_purge_list - purge inactive tt local entries
1020  * @bat_priv: the bat priv with all the soft interface information
1021  * @head: pointer to the list containing the local tt entries
1022  * @timeout: parameter deciding whether a given tt local entry is considered
1023  *  inactive or not
1024  */
1025 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1026                                        struct hlist_head *head,
1027                                        int timeout)
1028 {
1029         struct batadv_tt_local_entry *tt_local_entry;
1030         struct batadv_tt_common_entry *tt_common_entry;
1031         struct hlist_node *node_tmp;
1032
1033         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1034                                   hash_entry) {
1035                 tt_local_entry = container_of(tt_common_entry,
1036                                               struct batadv_tt_local_entry,
1037                                               common);
1038                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1039                         continue;
1040
1041                 /* entry already marked for deletion */
1042                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1043                         continue;
1044
1045                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1046                         continue;
1047
1048                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1049                                             BATADV_TT_CLIENT_DEL, "timed out");
1050         }
1051 }
1052
1053 /**
1054  * batadv_tt_local_purge - purge inactive tt local entries
1055  * @bat_priv: the bat priv with all the soft interface information
1056  * @timeout: parameter deciding whether a given tt local entry is considered
1057  *  inactive or not
1058  */
1059 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1060                                   int timeout)
1061 {
1062         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1063         struct hlist_head *head;
1064         spinlock_t *list_lock; /* protects write access to the hash lists */
1065         uint32_t i;
1066
1067         for (i = 0; i < hash->size; i++) {
1068                 head = &hash->table[i];
1069                 list_lock = &hash->list_locks[i];
1070
1071                 spin_lock_bh(list_lock);
1072                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1073                 spin_unlock_bh(list_lock);
1074         }
1075 }
1076
1077 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1078 {
1079         struct batadv_hashtable *hash;
1080         spinlock_t *list_lock; /* protects write access to the hash lists */
1081         struct batadv_tt_common_entry *tt_common_entry;
1082         struct batadv_tt_local_entry *tt_local;
1083         struct hlist_node *node_tmp;
1084         struct hlist_head *head;
1085         uint32_t i;
1086
1087         if (!bat_priv->tt.local_hash)
1088                 return;
1089
1090         hash = bat_priv->tt.local_hash;
1091
1092         for (i = 0; i < hash->size; i++) {
1093                 head = &hash->table[i];
1094                 list_lock = &hash->list_locks[i];
1095
1096                 spin_lock_bh(list_lock);
1097                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1098                                           head, hash_entry) {
1099                         hlist_del_rcu(&tt_common_entry->hash_entry);
1100                         tt_local = container_of(tt_common_entry,
1101                                                 struct batadv_tt_local_entry,
1102                                                 common);
1103                         batadv_tt_local_entry_free_ref(tt_local);
1104                 }
1105                 spin_unlock_bh(list_lock);
1106         }
1107
1108         batadv_hash_destroy(hash);
1109
1110         bat_priv->tt.local_hash = NULL;
1111 }
1112
1113 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1114 {
1115         if (bat_priv->tt.global_hash)
1116                 return 0;
1117
1118         bat_priv->tt.global_hash = batadv_hash_new(1024);
1119
1120         if (!bat_priv->tt.global_hash)
1121                 return -ENOMEM;
1122
1123         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1124                                    &batadv_tt_global_hash_lock_class_key);
1125
1126         return 0;
1127 }
1128
1129 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1130 {
1131         struct batadv_tt_change_node *entry, *safe;
1132
1133         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1134
1135         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1136                                  list) {
1137                 list_del(&entry->list);
1138                 kfree(entry);
1139         }
1140
1141         atomic_set(&bat_priv->tt.local_changes, 0);
1142         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1143 }
1144
1145 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1146  * batadv_tt_global_entry list
1147  *
1148  * returns it with an increased refcounter, NULL if not found
1149  */
1150 static struct batadv_tt_orig_list_entry *
1151 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1152                                  const struct batadv_orig_node *orig_node)
1153 {
1154         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1155         const struct hlist_head *head;
1156
1157         rcu_read_lock();
1158         head = &entry->orig_list;
1159         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1160                 if (tmp_orig_entry->orig_node != orig_node)
1161                         continue;
1162                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1163                         continue;
1164
1165                 orig_entry = tmp_orig_entry;
1166                 break;
1167         }
1168         rcu_read_unlock();
1169
1170         return orig_entry;
1171 }
1172
1173 /* find out if an orig_node is already in the list of a tt_global_entry.
1174  * returns true if found, false otherwise
1175  */
1176 static bool
1177 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1178                                 const struct batadv_orig_node *orig_node)
1179 {
1180         struct batadv_tt_orig_list_entry *orig_entry;
1181         bool found = false;
1182
1183         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1184         if (orig_entry) {
1185                 found = true;
1186                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1187         }
1188
1189         return found;
1190 }
1191
1192 static void
1193 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1194                                 struct batadv_orig_node *orig_node, int ttvn)
1195 {
1196         struct batadv_tt_orig_list_entry *orig_entry;
1197
1198         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1199         if (orig_entry) {
1200                 /* refresh the ttvn: the current value could be a bogus one that
1201                  * was added during a "temporary client detection"
1202                  */
1203                 orig_entry->ttvn = ttvn;
1204                 goto out;
1205         }
1206
1207         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1208         if (!orig_entry)
1209                 goto out;
1210
1211         INIT_HLIST_NODE(&orig_entry->list);
1212         atomic_inc(&orig_node->refcount);
1213         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1214         orig_entry->orig_node = orig_node;
1215         orig_entry->ttvn = ttvn;
1216         atomic_set(&orig_entry->refcount, 2);
1217
1218         spin_lock_bh(&tt_global->list_lock);
1219         hlist_add_head_rcu(&orig_entry->list,
1220                            &tt_global->orig_list);
1221         spin_unlock_bh(&tt_global->list_lock);
1222 out:
1223         if (orig_entry)
1224                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1225 }
1226
1227 /**
1228  * batadv_tt_global_add - add a new TT global entry or update an existing one
1229  * @bat_priv: the bat priv with all the soft interface information
1230  * @orig_node: the originator announcing the client
1231  * @tt_addr: the mac address of the non-mesh client
1232  * @vid: VLAN identifier
1233  * @flags: TT flags that have to be set for this non-mesh client
1234  * @ttvn: the tt version number ever announcing this non-mesh client
1235  *
1236  * Add a new TT global entry for the given originator. If the entry already
1237  * exists add a new reference to the given originator (a global entry can have
1238  * references to multiple originators) and adjust the flags attribute to reflect
1239  * the function argument.
1240  * If a TT local entry exists for this non-mesh client remove it.
1241  *
1242  * The caller must hold orig_node refcount.
1243  *
1244  * Return true if the new entry has been added, false otherwise
1245  */
1246 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1247                                  struct batadv_orig_node *orig_node,
1248                                  const unsigned char *tt_addr,
1249                                  unsigned short vid, uint16_t flags,
1250                                  uint8_t ttvn)
1251 {
1252         struct batadv_tt_global_entry *tt_global_entry;
1253         struct batadv_tt_local_entry *tt_local_entry;
1254         bool ret = false;
1255         int hash_added;
1256         struct batadv_tt_common_entry *common;
1257         uint16_t local_flags;
1258
1259         /* ignore global entries from backbone nodes */
1260         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1261                 return true;
1262
1263         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1264         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1265
1266         /* if the node already has a local client for this entry, it has to wait
1267          * for a roaming advertisement instead of manually messing up the global
1268          * table
1269          */
1270         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1271             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1272                 goto out;
1273
1274         if (!tt_global_entry) {
1275                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1276                 if (!tt_global_entry)
1277                         goto out;
1278
1279                 common = &tt_global_entry->common;
1280                 memcpy(common->addr, tt_addr, ETH_ALEN);
1281                 common->vid = vid;
1282
1283                 common->flags = flags;
1284                 tt_global_entry->roam_at = 0;
1285                 /* node must store current time in case of roaming. This is
1286                  * needed to purge this entry out on timeout (if nobody claims
1287                  * it)
1288                  */
1289                 if (flags & BATADV_TT_CLIENT_ROAM)
1290                         tt_global_entry->roam_at = jiffies;
1291                 atomic_set(&common->refcount, 2);
1292                 common->added_at = jiffies;
1293
1294                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1295                 spin_lock_init(&tt_global_entry->list_lock);
1296
1297                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1298                                              batadv_compare_tt,
1299                                              batadv_choose_tt, common,
1300                                              &common->hash_entry);
1301
1302                 if (unlikely(hash_added != 0)) {
1303                         /* remove the reference for the hash */
1304                         batadv_tt_global_entry_free_ref(tt_global_entry);
1305                         goto out_remove;
1306                 }
1307         } else {
1308                 common = &tt_global_entry->common;
1309                 /* If there is already a global entry, we can use this one for
1310                  * our processing.
1311                  * But if we are trying to add a temporary client then here are
1312                  * two options at this point:
1313                  * 1) the global client is not a temporary client: the global
1314                  *    client has to be left as it is, temporary information
1315                  *    should never override any already known client state
1316                  * 2) the global client is a temporary client: purge the
1317                  *    originator list and add the new one orig_entry
1318                  */
1319                 if (flags & BATADV_TT_CLIENT_TEMP) {
1320                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1321                                 goto out;
1322                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1323                                                             orig_node))
1324                                 goto out_remove;
1325                         batadv_tt_global_del_orig_list(tt_global_entry);
1326                         goto add_orig_entry;
1327                 }
1328
1329                 /* if the client was temporary added before receiving the first
1330                  * OGM announcing it, we have to clear the TEMP flag
1331                  */
1332                 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1333
1334                 /* the change can carry possible "attribute" flags like the
1335                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1336                  * client entry
1337                  */
1338                 tt_global_entry->common.flags |= flags;
1339
1340                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1341                  * one originator left in the list and we previously received a
1342                  * delete + roaming change for this originator.
1343                  *
1344                  * We should first delete the old originator before adding the
1345                  * new one.
1346                  */
1347                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1348                         batadv_tt_global_del_orig_list(tt_global_entry);
1349                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1350                         tt_global_entry->roam_at = 0;
1351                 }
1352         }
1353 add_orig_entry:
1354         /* add the new orig_entry (if needed) or update it */
1355         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1356
1357         batadv_dbg(BATADV_DBG_TT, bat_priv,
1358                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1359                    common->addr, BATADV_PRINT_VID(common->vid),
1360                    orig_node->orig);
1361         ret = true;
1362
1363 out_remove:
1364
1365         /* remove address from local hash if present */
1366         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1367                                              "global tt received",
1368                                              flags & BATADV_TT_CLIENT_ROAM);
1369         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1370
1371         if (!(flags & BATADV_TT_CLIENT_ROAM))
1372                 /* this is a normal global add. Therefore the client is not in a
1373                  * roaming state anymore.
1374                  */
1375                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1376
1377 out:
1378         if (tt_global_entry)
1379                 batadv_tt_global_entry_free_ref(tt_global_entry);
1380         if (tt_local_entry)
1381                 batadv_tt_local_entry_free_ref(tt_local_entry);
1382         return ret;
1383 }
1384
1385 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
1386  * @bat_priv: the bat priv with all the soft interface information
1387  * @tt_global_entry: global translation table entry to be analyzed
1388  *
1389  * This functon assumes the caller holds rcu_read_lock().
1390  * Returns best originator list entry or NULL on errors.
1391  */
1392 static struct batadv_tt_orig_list_entry *
1393 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1394                             struct batadv_tt_global_entry *tt_global_entry)
1395 {
1396         struct batadv_neigh_node *router, *best_router = NULL;
1397         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1398         struct hlist_head *head;
1399         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1400
1401         head = &tt_global_entry->orig_list;
1402         hlist_for_each_entry_rcu(orig_entry, head, list) {
1403                 router = batadv_orig_node_get_router(orig_entry->orig_node);
1404                 if (!router)
1405                         continue;
1406
1407                 if (best_router &&
1408                     bao->bat_neigh_cmp(router, best_router) <= 0) {
1409                         batadv_neigh_node_free_ref(router);
1410                         continue;
1411                 }
1412
1413                 /* release the refcount for the "old" best */
1414                 if (best_router)
1415                         batadv_neigh_node_free_ref(best_router);
1416
1417                 best_entry = orig_entry;
1418                 best_router = router;
1419         }
1420
1421         if (best_router)
1422                 batadv_neigh_node_free_ref(best_router);
1423
1424         return best_entry;
1425 }
1426
1427 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1428  * for this global entry
1429  * @bat_priv: the bat priv with all the soft interface information
1430  * @tt_global_entry: global translation table entry to be printed
1431  * @seq: debugfs table seq_file struct
1432  *
1433  * This functon assumes the caller holds rcu_read_lock().
1434  */
1435 static void
1436 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1437                              struct batadv_tt_global_entry *tt_global_entry,
1438                              struct seq_file *seq)
1439 {
1440         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1441         struct batadv_tt_common_entry *tt_common_entry;
1442         struct batadv_orig_node_vlan *vlan;
1443         struct hlist_head *head;
1444         uint8_t last_ttvn;
1445         uint16_t flags;
1446
1447         tt_common_entry = &tt_global_entry->common;
1448         flags = tt_common_entry->flags;
1449
1450         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1451         if (best_entry) {
1452                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1453                                                  tt_common_entry->vid);
1454                 if (!vlan) {
1455                         seq_printf(seq,
1456                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1457                                    BATADV_PRINT_VID(tt_common_entry->vid),
1458                                    best_entry->orig_node->orig);
1459                         goto print_list;
1460                 }
1461
1462                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1463                 seq_printf(seq,
1464                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1465                            '*', tt_global_entry->common.addr,
1466                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1467                            best_entry->ttvn, best_entry->orig_node->orig,
1468                            last_ttvn, vlan->tt.crc,
1469                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1470                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1471                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1472                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1473
1474                 batadv_orig_node_vlan_free_ref(vlan);
1475         }
1476
1477 print_list:
1478         head = &tt_global_entry->orig_list;
1479
1480         hlist_for_each_entry_rcu(orig_entry, head, list) {
1481                 if (best_entry == orig_entry)
1482                         continue;
1483
1484                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1485                                                  tt_common_entry->vid);
1486                 if (!vlan) {
1487                         seq_printf(seq,
1488                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1489                                    BATADV_PRINT_VID(tt_common_entry->vid),
1490                                    orig_entry->orig_node->orig);
1491                         continue;
1492                 }
1493
1494                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1495                 seq_printf(seq,
1496                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1497                            '+', tt_global_entry->common.addr,
1498                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1499                            orig_entry->ttvn, orig_entry->orig_node->orig,
1500                            last_ttvn, vlan->tt.crc,
1501                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1502                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1503                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1504                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1505
1506                 batadv_orig_node_vlan_free_ref(vlan);
1507         }
1508 }
1509
1510 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1511 {
1512         struct net_device *net_dev = (struct net_device *)seq->private;
1513         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1514         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1515         struct batadv_tt_common_entry *tt_common_entry;
1516         struct batadv_tt_global_entry *tt_global;
1517         struct batadv_hard_iface *primary_if;
1518         struct hlist_head *head;
1519         uint32_t i;
1520
1521         primary_if = batadv_seq_print_text_primary_if_get(seq);
1522         if (!primary_if)
1523                 goto out;
1524
1525         seq_printf(seq,
1526                    "Globally announced TT entries received via the mesh %s\n",
1527                    net_dev->name);
1528         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1529                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1530                    "CRC", "Flags");
1531
1532         for (i = 0; i < hash->size; i++) {
1533                 head = &hash->table[i];
1534
1535                 rcu_read_lock();
1536                 hlist_for_each_entry_rcu(tt_common_entry,
1537                                          head, hash_entry) {
1538                         tt_global = container_of(tt_common_entry,
1539                                                  struct batadv_tt_global_entry,
1540                                                  common);
1541                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1542                 }
1543                 rcu_read_unlock();
1544         }
1545 out:
1546         if (primary_if)
1547                 batadv_hardif_free_ref(primary_if);
1548         return 0;
1549 }
1550
1551 /* deletes the orig list of a tt_global_entry */
1552 static void
1553 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1554 {
1555         struct hlist_head *head;
1556         struct hlist_node *safe;
1557         struct batadv_tt_orig_list_entry *orig_entry;
1558
1559         spin_lock_bh(&tt_global_entry->list_lock);
1560         head = &tt_global_entry->orig_list;
1561         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1562                 hlist_del_rcu(&orig_entry->list);
1563                 batadv_tt_global_size_dec(orig_entry->orig_node,
1564                                           tt_global_entry->common.vid);
1565                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1566         }
1567         spin_unlock_bh(&tt_global_entry->list_lock);
1568 }
1569
1570 static void
1571 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
1572                                 struct batadv_tt_global_entry *tt_global_entry,
1573                                 struct batadv_orig_node *orig_node,
1574                                 const char *message)
1575 {
1576         struct hlist_head *head;
1577         struct hlist_node *safe;
1578         struct batadv_tt_orig_list_entry *orig_entry;
1579         unsigned short vid;
1580
1581         spin_lock_bh(&tt_global_entry->list_lock);
1582         head = &tt_global_entry->orig_list;
1583         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1584                 if (orig_entry->orig_node == orig_node) {
1585                         vid = tt_global_entry->common.vid;
1586                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1587                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1588                                    orig_node->orig,
1589                                    tt_global_entry->common.addr,
1590                                    BATADV_PRINT_VID(vid), message);
1591                         hlist_del_rcu(&orig_entry->list);
1592                         batadv_tt_global_size_dec(orig_node,
1593                                                   tt_global_entry->common.vid);
1594                         batadv_tt_orig_list_entry_free_ref(orig_entry);
1595                 }
1596         }
1597         spin_unlock_bh(&tt_global_entry->list_lock);
1598 }
1599
1600 /* If the client is to be deleted, we check if it is the last origantor entry
1601  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1602  * timer, otherwise we simply remove the originator scheduled for deletion.
1603  */
1604 static void
1605 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1606                              struct batadv_tt_global_entry *tt_global_entry,
1607                              struct batadv_orig_node *orig_node,
1608                              const char *message)
1609 {
1610         bool last_entry = true;
1611         struct hlist_head *head;
1612         struct batadv_tt_orig_list_entry *orig_entry;
1613
1614         /* no local entry exists, case 1:
1615          * Check if this is the last one or if other entries exist.
1616          */
1617
1618         rcu_read_lock();
1619         head = &tt_global_entry->orig_list;
1620         hlist_for_each_entry_rcu(orig_entry, head, list) {
1621                 if (orig_entry->orig_node != orig_node) {
1622                         last_entry = false;
1623                         break;
1624                 }
1625         }
1626         rcu_read_unlock();
1627
1628         if (last_entry) {
1629                 /* its the last one, mark for roaming. */
1630                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1631                 tt_global_entry->roam_at = jiffies;
1632         } else
1633                 /* there is another entry, we can simply delete this
1634                  * one and can still use the other one.
1635                  */
1636                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1637                                                 orig_node, message);
1638 }
1639
1640 /**
1641  * batadv_tt_global_del - remove a client from the global table
1642  * @bat_priv: the bat priv with all the soft interface information
1643  * @orig_node: an originator serving this client
1644  * @addr: the mac address of the client
1645  * @vid: VLAN identifier
1646  * @message: a message explaining the reason for deleting the client to print
1647  *  for debugging purpose
1648  * @roaming: true if the deletion has been triggered by a roaming event
1649  */
1650 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1651                                  struct batadv_orig_node *orig_node,
1652                                  const unsigned char *addr, unsigned short vid,
1653                                  const char *message, bool roaming)
1654 {
1655         struct batadv_tt_global_entry *tt_global_entry;
1656         struct batadv_tt_local_entry *local_entry = NULL;
1657
1658         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1659         if (!tt_global_entry)
1660                 goto out;
1661
1662         if (!roaming) {
1663                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1664                                                 orig_node, message);
1665
1666                 if (hlist_empty(&tt_global_entry->orig_list))
1667                         batadv_tt_global_free(bat_priv, tt_global_entry,
1668                                               message);
1669
1670                 goto out;
1671         }
1672
1673         /* if we are deleting a global entry due to a roam
1674          * event, there are two possibilities:
1675          * 1) the client roamed from node A to node B => if there
1676          *    is only one originator left for this client, we mark
1677          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1678          *    wait for node B to claim it. In case of timeout
1679          *    the entry is purged.
1680          *
1681          *    If there are other originators left, we directly delete
1682          *    the originator.
1683          * 2) the client roamed to us => we can directly delete
1684          *    the global entry, since it is useless now.
1685          */
1686         local_entry = batadv_tt_local_hash_find(bat_priv,
1687                                                 tt_global_entry->common.addr,
1688                                                 vid);
1689         if (local_entry) {
1690                 /* local entry exists, case 2: client roamed to us. */
1691                 batadv_tt_global_del_orig_list(tt_global_entry);
1692                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1693         } else
1694                 /* no local entry exists, case 1: check for roaming */
1695                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1696                                              orig_node, message);
1697
1698
1699 out:
1700         if (tt_global_entry)
1701                 batadv_tt_global_entry_free_ref(tt_global_entry);
1702         if (local_entry)
1703                 batadv_tt_local_entry_free_ref(local_entry);
1704 }
1705
1706 /**
1707  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1708  *  given originator matching the provided vid
1709  * @bat_priv: the bat priv with all the soft interface information
1710  * @orig_node: the originator owning the entries to remove
1711  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1712  *  removed
1713  * @message: debug message to print as "reason"
1714  */
1715 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1716                                struct batadv_orig_node *orig_node,
1717                                int32_t match_vid,
1718                                const char *message)
1719 {
1720         struct batadv_tt_global_entry *tt_global;
1721         struct batadv_tt_common_entry *tt_common_entry;
1722         uint32_t i;
1723         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1724         struct hlist_node *safe;
1725         struct hlist_head *head;
1726         spinlock_t *list_lock; /* protects write access to the hash lists */
1727         unsigned short vid;
1728
1729         if (!hash)
1730                 return;
1731
1732         for (i = 0; i < hash->size; i++) {
1733                 head = &hash->table[i];
1734                 list_lock = &hash->list_locks[i];
1735
1736                 spin_lock_bh(list_lock);
1737                 hlist_for_each_entry_safe(tt_common_entry, safe,
1738                                           head, hash_entry) {
1739                         /* remove only matching entries */
1740                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1741                                 continue;
1742
1743                         tt_global = container_of(tt_common_entry,
1744                                                  struct batadv_tt_global_entry,
1745                                                  common);
1746
1747                         batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1748                                                         orig_node, message);
1749
1750                         if (hlist_empty(&tt_global->orig_list)) {
1751                                 vid = tt_global->common.vid;
1752                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1753                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1754                                            tt_global->common.addr,
1755                                            BATADV_PRINT_VID(vid), message);
1756                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1757                                 batadv_tt_global_entry_free_ref(tt_global);
1758                         }
1759                 }
1760                 spin_unlock_bh(list_lock);
1761         }
1762         orig_node->tt_initialised = false;
1763 }
1764
1765 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1766                                       char **msg)
1767 {
1768         bool purge = false;
1769         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1770         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1771
1772         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1773             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1774                 purge = true;
1775                 *msg = "Roaming timeout\n";
1776         }
1777
1778         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1779             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1780                 purge = true;
1781                 *msg = "Temporary client timeout\n";
1782         }
1783
1784         return purge;
1785 }
1786
1787 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1788 {
1789         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1790         struct hlist_head *head;
1791         struct hlist_node *node_tmp;
1792         spinlock_t *list_lock; /* protects write access to the hash lists */
1793         uint32_t i;
1794         char *msg = NULL;
1795         struct batadv_tt_common_entry *tt_common;
1796         struct batadv_tt_global_entry *tt_global;
1797
1798         for (i = 0; i < hash->size; i++) {
1799                 head = &hash->table[i];
1800                 list_lock = &hash->list_locks[i];
1801
1802                 spin_lock_bh(list_lock);
1803                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1804                                           hash_entry) {
1805                         tt_global = container_of(tt_common,
1806                                                  struct batadv_tt_global_entry,
1807                                                  common);
1808
1809                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1810                                 continue;
1811
1812                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1813                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1814                                    tt_global->common.addr,
1815                                    BATADV_PRINT_VID(tt_global->common.vid),
1816                                    msg);
1817
1818                         hlist_del_rcu(&tt_common->hash_entry);
1819
1820                         batadv_tt_global_entry_free_ref(tt_global);
1821                 }
1822                 spin_unlock_bh(list_lock);
1823         }
1824 }
1825
1826 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1827 {
1828         struct batadv_hashtable *hash;
1829         spinlock_t *list_lock; /* protects write access to the hash lists */
1830         struct batadv_tt_common_entry *tt_common_entry;
1831         struct batadv_tt_global_entry *tt_global;
1832         struct hlist_node *node_tmp;
1833         struct hlist_head *head;
1834         uint32_t i;
1835
1836         if (!bat_priv->tt.global_hash)
1837                 return;
1838
1839         hash = bat_priv->tt.global_hash;
1840
1841         for (i = 0; i < hash->size; i++) {
1842                 head = &hash->table[i];
1843                 list_lock = &hash->list_locks[i];
1844
1845                 spin_lock_bh(list_lock);
1846                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1847                                           head, hash_entry) {
1848                         hlist_del_rcu(&tt_common_entry->hash_entry);
1849                         tt_global = container_of(tt_common_entry,
1850                                                  struct batadv_tt_global_entry,
1851                                                  common);
1852                         batadv_tt_global_entry_free_ref(tt_global);
1853                 }
1854                 spin_unlock_bh(list_lock);
1855         }
1856
1857         batadv_hash_destroy(hash);
1858
1859         bat_priv->tt.global_hash = NULL;
1860 }
1861
1862 static bool
1863 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1864                        struct batadv_tt_global_entry *tt_global_entry)
1865 {
1866         bool ret = false;
1867
1868         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1869             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1870                 ret = true;
1871
1872         /* check if the two clients are marked as isolated */
1873         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
1874             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
1875                 ret = true;
1876
1877         return ret;
1878 }
1879
1880 /**
1881  * batadv_transtable_search - get the mesh destination for a given client
1882  * @bat_priv: the bat priv with all the soft interface information
1883  * @src: mac address of the source client
1884  * @addr: mac address of the destination client
1885  * @vid: VLAN identifier
1886  *
1887  * Returns a pointer to the originator that was selected as destination in the
1888  * mesh for contacting the client 'addr', NULL otherwise.
1889  * In case of multiple originators serving the same client, the function returns
1890  * the best one (best in terms of metric towards the destination node).
1891  *
1892  * If the two clients are AP isolated the function returns NULL.
1893  */
1894 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1895                                                   const uint8_t *src,
1896                                                   const uint8_t *addr,
1897                                                   unsigned short vid)
1898 {
1899         struct batadv_tt_local_entry *tt_local_entry = NULL;
1900         struct batadv_tt_global_entry *tt_global_entry = NULL;
1901         struct batadv_orig_node *orig_node = NULL;
1902         struct batadv_tt_orig_list_entry *best_entry;
1903         bool ap_isolation_enabled = false;
1904         struct batadv_softif_vlan *vlan;
1905
1906         /* if the AP isolation is requested on a VLAN, then check for its
1907          * setting in the proper VLAN private data structure
1908          */
1909         vlan = batadv_softif_vlan_get(bat_priv, vid);
1910         if (vlan) {
1911                 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
1912                 batadv_softif_vlan_free_ref(vlan);
1913         }
1914
1915         if (src && ap_isolation_enabled) {
1916                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1917                 if (!tt_local_entry ||
1918                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1919                         goto out;
1920         }
1921
1922         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1923         if (!tt_global_entry)
1924                 goto out;
1925
1926         /* check whether the clients should not communicate due to AP
1927          * isolation
1928          */
1929         if (tt_local_entry &&
1930             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1931                 goto out;
1932
1933         rcu_read_lock();
1934         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1935         /* found anything? */
1936         if (best_entry)
1937                 orig_node = best_entry->orig_node;
1938         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1939                 orig_node = NULL;
1940         rcu_read_unlock();
1941
1942 out:
1943         if (tt_global_entry)
1944                 batadv_tt_global_entry_free_ref(tt_global_entry);
1945         if (tt_local_entry)
1946                 batadv_tt_local_entry_free_ref(tt_local_entry);
1947
1948         return orig_node;
1949 }
1950
1951 /**
1952  * batadv_tt_global_crc - calculates the checksum of the local table belonging
1953  *  to the given orig_node
1954  * @bat_priv: the bat priv with all the soft interface information
1955  * @orig_node: originator for which the CRC should be computed
1956  * @vid: VLAN identifier for which the CRC32 has to be computed
1957  *
1958  * This function computes the checksum for the global table corresponding to a
1959  * specific originator. In particular, the checksum is computed as follows: For
1960  * each client connected to the originator the CRC32C of the MAC address and the
1961  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1962  * together.
1963  *
1964  * The idea behind is that CRC32C should be used as much as possible in order to
1965  * produce a unique hash of the table, but since the order which is used to feed
1966  * the CRC32C function affects the result and since every node in the network
1967  * probably sorts the clients differently, the hash function cannot be directly
1968  * computed over the entire table. Hence the CRC32C is used only on
1969  * the single client entry, while all the results are then xor'ed together
1970  * because the XOR operation can combine them all while trying to reduce the
1971  * noise as much as possible.
1972  *
1973  * Returns the checksum of the global table of a given originator.
1974  */
1975 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1976                                      struct batadv_orig_node *orig_node,
1977                                      unsigned short vid)
1978 {
1979         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1980         struct batadv_tt_common_entry *tt_common;
1981         struct batadv_tt_global_entry *tt_global;
1982         struct hlist_head *head;
1983         uint32_t i, crc_tmp, crc = 0;
1984         uint8_t flags;
1985
1986         for (i = 0; i < hash->size; i++) {
1987                 head = &hash->table[i];
1988
1989                 rcu_read_lock();
1990                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1991                         tt_global = container_of(tt_common,
1992                                                  struct batadv_tt_global_entry,
1993                                                  common);
1994                         /* compute the CRC only for entries belonging to the
1995                          * VLAN identified by the vid passed as parameter
1996                          */
1997                         if (tt_common->vid != vid)
1998                                 continue;
1999
2000                         /* Roaming clients are in the global table for
2001                          * consistency only. They don't have to be
2002                          * taken into account while computing the
2003                          * global crc
2004                          */
2005                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2006                                 continue;
2007                         /* Temporary clients have not been announced yet, so
2008                          * they have to be skipped while computing the global
2009                          * crc
2010                          */
2011                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2012                                 continue;
2013
2014                         /* find out if this global entry is announced by this
2015                          * originator
2016                          */
2017                         if (!batadv_tt_global_entry_has_orig(tt_global,
2018                                                              orig_node))
2019                                 continue;
2020
2021                         crc_tmp = crc32c(0, &tt_common->vid,
2022                                          sizeof(tt_common->vid));
2023
2024                         /* compute the CRC on flags that have to be kept in sync
2025                          * among nodes
2026                          */
2027                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2028                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2029
2030                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2031                 }
2032                 rcu_read_unlock();
2033         }
2034
2035         return crc;
2036 }
2037
2038 /**
2039  * batadv_tt_local_crc - calculates the checksum of the local table
2040  * @bat_priv: the bat priv with all the soft interface information
2041  * @vid: VLAN identifier for which the CRC32 has to be computed
2042  *
2043  * For details about the computation, please refer to the documentation for
2044  * batadv_tt_global_crc().
2045  *
2046  * Returns the checksum of the local table
2047  */
2048 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2049                                     unsigned short vid)
2050 {
2051         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2052         struct batadv_tt_common_entry *tt_common;
2053         struct hlist_head *head;
2054         uint32_t i, crc_tmp, crc = 0;
2055         uint8_t flags;
2056
2057         for (i = 0; i < hash->size; i++) {
2058                 head = &hash->table[i];
2059
2060                 rcu_read_lock();
2061                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2062                         /* compute the CRC only for entries belonging to the
2063                          * VLAN identified by vid
2064                          */
2065                         if (tt_common->vid != vid)
2066                                 continue;
2067
2068                         /* not yet committed clients have not to be taken into
2069                          * account while computing the CRC
2070                          */
2071                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2072                                 continue;
2073
2074                         crc_tmp = crc32c(0, &tt_common->vid,
2075                                          sizeof(tt_common->vid));
2076
2077                         /* compute the CRC on flags that have to be kept in sync
2078                          * among nodes
2079                          */
2080                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2081                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2082
2083                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2084                 }
2085                 rcu_read_unlock();
2086         }
2087
2088         return crc;
2089 }
2090
2091 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2092 {
2093         struct batadv_tt_req_node *node, *safe;
2094
2095         spin_lock_bh(&bat_priv->tt.req_list_lock);
2096
2097         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2098                 list_del(&node->list);
2099                 kfree(node);
2100         }
2101
2102         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2103 }
2104
2105 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2106                                        struct batadv_orig_node *orig_node,
2107                                        const void *tt_buff,
2108                                        uint16_t tt_buff_len)
2109 {
2110         /* Replace the old buffer only if I received something in the
2111          * last OGM (the OGM could carry no changes)
2112          */
2113         spin_lock_bh(&orig_node->tt_buff_lock);
2114         if (tt_buff_len > 0) {
2115                 kfree(orig_node->tt_buff);
2116                 orig_node->tt_buff_len = 0;
2117                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2118                 if (orig_node->tt_buff) {
2119                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2120                         orig_node->tt_buff_len = tt_buff_len;
2121                 }
2122         }
2123         spin_unlock_bh(&orig_node->tt_buff_lock);
2124 }
2125
2126 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2127 {
2128         struct batadv_tt_req_node *node, *safe;
2129
2130         spin_lock_bh(&bat_priv->tt.req_list_lock);
2131         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2132                 if (batadv_has_timed_out(node->issued_at,
2133                                          BATADV_TT_REQUEST_TIMEOUT)) {
2134                         list_del(&node->list);
2135                         kfree(node);
2136                 }
2137         }
2138         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2139 }
2140
2141 /* returns the pointer to the new tt_req_node struct if no request
2142  * has already been issued for this orig_node, NULL otherwise
2143  */
2144 static struct batadv_tt_req_node *
2145 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2146                        struct batadv_orig_node *orig_node)
2147 {
2148         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2149
2150         spin_lock_bh(&bat_priv->tt.req_list_lock);
2151         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2152                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2153                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2154                                           BATADV_TT_REQUEST_TIMEOUT))
2155                         goto unlock;
2156         }
2157
2158         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2159         if (!tt_req_node)
2160                 goto unlock;
2161
2162         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
2163         tt_req_node->issued_at = jiffies;
2164
2165         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2166 unlock:
2167         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2168         return tt_req_node;
2169 }
2170
2171 /**
2172  * batadv_tt_local_valid - verify that given tt entry is a valid one
2173  * @entry_ptr: to be checked local tt entry
2174  * @data_ptr: not used but definition required to satisfy the callback prototype
2175  *
2176  * Returns 1 if the entry is a valid, 0 otherwise.
2177  */
2178 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2179 {
2180         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2181
2182         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2183                 return 0;
2184         return 1;
2185 }
2186
2187 static int batadv_tt_global_valid(const void *entry_ptr,
2188                                   const void *data_ptr)
2189 {
2190         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2191         const struct batadv_tt_global_entry *tt_global_entry;
2192         const struct batadv_orig_node *orig_node = data_ptr;
2193
2194         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2195             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2196                 return 0;
2197
2198         tt_global_entry = container_of(tt_common_entry,
2199                                        struct batadv_tt_global_entry,
2200                                        common);
2201
2202         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2203 }
2204
2205 /**
2206  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2207  *  specified tt hash
2208  * @bat_priv: the bat priv with all the soft interface information
2209  * @hash: hash table containing the tt entries
2210  * @tt_len: expected tvlv tt data buffer length in number of bytes
2211  * @tvlv_buff: pointer to the buffer to fill with the TT data
2212  * @valid_cb: function to filter tt change entries
2213  * @cb_data: data passed to the filter function as argument
2214  */
2215 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2216                                     struct batadv_hashtable *hash,
2217                                     void *tvlv_buff, uint16_t tt_len,
2218                                     int (*valid_cb)(const void *, const void *),
2219                                     void *cb_data)
2220 {
2221         struct batadv_tt_common_entry *tt_common_entry;
2222         struct batadv_tvlv_tt_change *tt_change;
2223         struct hlist_head *head;
2224         uint16_t tt_tot, tt_num_entries = 0;
2225         uint32_t i;
2226
2227         tt_tot = batadv_tt_entries(tt_len);
2228         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2229
2230         rcu_read_lock();
2231         for (i = 0; i < hash->size; i++) {
2232                 head = &hash->table[i];
2233
2234                 hlist_for_each_entry_rcu(tt_common_entry,
2235                                          head, hash_entry) {
2236                         if (tt_tot == tt_num_entries)
2237                                 break;
2238
2239                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2240                                 continue;
2241
2242                         memcpy(tt_change->addr, tt_common_entry->addr,
2243                                ETH_ALEN);
2244                         tt_change->flags = tt_common_entry->flags;
2245                         tt_change->vid = htons(tt_common_entry->vid);
2246                         memset(tt_change->reserved, 0,
2247                                sizeof(tt_change->reserved));
2248
2249                         tt_num_entries++;
2250                         tt_change++;
2251                 }
2252         }
2253         rcu_read_unlock();
2254 }
2255
2256 /**
2257  * batadv_tt_global_check_crc - check if all the CRCs are correct
2258  * @orig_node: originator for which the CRCs have to be checked
2259  * @tt_vlan: pointer to the first tvlv VLAN entry
2260  * @num_vlan: number of tvlv VLAN entries
2261  * @create: if true, create VLAN objects if not found
2262  *
2263  * Return true if all the received CRCs match the locally stored ones, false
2264  * otherwise
2265  */
2266 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2267                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2268                                        uint16_t num_vlan)
2269 {
2270         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2271         struct batadv_orig_node_vlan *vlan;
2272         int i;
2273
2274         /* check if each received CRC matches the locally stored one */
2275         for (i = 0; i < num_vlan; i++) {
2276                 tt_vlan_tmp = tt_vlan + i;
2277
2278                 /* if orig_node is a backbone node for this VLAN, don't check
2279                  * the CRC as we ignore all the global entries over it
2280                  */
2281                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2282                                                    orig_node->orig,
2283                                                    ntohs(tt_vlan_tmp->vid)))
2284                         continue;
2285
2286                 vlan = batadv_orig_node_vlan_get(orig_node,
2287                                                  ntohs(tt_vlan_tmp->vid));
2288                 if (!vlan)
2289                         return false;
2290
2291                 if (vlan->tt.crc != ntohl(tt_vlan_tmp->crc))
2292                         return false;
2293         }
2294
2295         return true;
2296 }
2297
2298 /**
2299  * batadv_tt_local_update_crc - update all the local CRCs
2300  * @bat_priv: the bat priv with all the soft interface information
2301  */
2302 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2303 {
2304         struct batadv_softif_vlan *vlan;
2305
2306         /* recompute the global CRC for each VLAN */
2307         rcu_read_lock();
2308         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2309                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2310         }
2311         rcu_read_unlock();
2312 }
2313
2314 /**
2315  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2316  * @bat_priv: the bat priv with all the soft interface information
2317  * @orig_node: the orig_node for which the CRCs have to be updated
2318  */
2319 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2320                                         struct batadv_orig_node *orig_node)
2321 {
2322         struct batadv_orig_node_vlan *vlan;
2323         uint32_t crc;
2324
2325         /* recompute the global CRC for each VLAN */
2326         rcu_read_lock();
2327         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2328                 /* if orig_node is a backbone node for this VLAN, don't compute
2329                  * the CRC as we ignore all the global entries over it
2330                  */
2331                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2332                                                    vlan->vid))
2333                         continue;
2334
2335                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2336                 vlan->tt.crc = crc;
2337         }
2338         rcu_read_unlock();
2339 }
2340
2341 /**
2342  * batadv_send_tt_request - send a TT Request message to a given node
2343  * @bat_priv: the bat priv with all the soft interface information
2344  * @dst_orig_node: the destination of the message
2345  * @ttvn: the version number that the source of the message is looking for
2346  * @tt_vlan: pointer to the first tvlv VLAN object to request
2347  * @num_vlan: number of tvlv VLAN entries
2348  * @full_table: ask for the entire translation table if true, while only for the
2349  *  last TT diff otherwise
2350  */
2351 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2352                                   struct batadv_orig_node *dst_orig_node,
2353                                   uint8_t ttvn,
2354                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2355                                   uint16_t num_vlan, bool full_table)
2356 {
2357         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2358         struct batadv_tt_req_node *tt_req_node = NULL;
2359         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2360         struct batadv_hard_iface *primary_if;
2361         bool ret = false;
2362         int i, size;
2363
2364         primary_if = batadv_primary_if_get_selected(bat_priv);
2365         if (!primary_if)
2366                 goto out;
2367
2368         /* The new tt_req will be issued only if I'm not waiting for a
2369          * reply from the same orig_node yet
2370          */
2371         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2372         if (!tt_req_node)
2373                 goto out;
2374
2375         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2376         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2377         if (!tvlv_tt_data)
2378                 goto out;
2379
2380         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2381         tvlv_tt_data->ttvn = ttvn;
2382         tvlv_tt_data->num_vlan = htons(num_vlan);
2383
2384         /* send all the CRCs within the request. This is needed by intermediate
2385          * nodes to ensure they have the correct table before replying
2386          */
2387         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2388         for (i = 0; i < num_vlan; i++) {
2389                 tt_vlan_req->vid = tt_vlan->vid;
2390                 tt_vlan_req->crc = tt_vlan->crc;
2391
2392                 tt_vlan_req++;
2393                 tt_vlan++;
2394         }
2395
2396         if (full_table)
2397                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2398
2399         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2400                    dst_orig_node->orig, full_table ? 'F' : '.');
2401
2402         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2403         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2404                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2405                                  tvlv_tt_data, size);
2406         ret = true;
2407
2408 out:
2409         if (primary_if)
2410                 batadv_hardif_free_ref(primary_if);
2411         if (ret && tt_req_node) {
2412                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2413                 list_del(&tt_req_node->list);
2414                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2415                 kfree(tt_req_node);
2416         }
2417         kfree(tvlv_tt_data);
2418         return ret;
2419 }
2420
2421 /**
2422  * batadv_send_other_tt_response - send reply to tt request concerning another
2423  *  node's translation table
2424  * @bat_priv: the bat priv with all the soft interface information
2425  * @tt_data: tt data containing the tt request information
2426  * @req_src: mac address of tt request sender
2427  * @req_dst: mac address of tt request recipient
2428  *
2429  * Returns true if tt request reply was sent, false otherwise.
2430  */
2431 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2432                                           struct batadv_tvlv_tt_data *tt_data,
2433                                           uint8_t *req_src, uint8_t *req_dst)
2434 {
2435         struct batadv_orig_node *req_dst_orig_node;
2436         struct batadv_orig_node *res_dst_orig_node = NULL;
2437         struct batadv_tvlv_tt_change *tt_change;
2438         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2439         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2440         bool ret = false, full_table;
2441         uint8_t orig_ttvn, req_ttvn;
2442         uint16_t tvlv_len;
2443         int32_t tt_len;
2444
2445         batadv_dbg(BATADV_DBG_TT, bat_priv,
2446                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2447                    req_src, tt_data->ttvn, req_dst,
2448                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2449
2450         /* Let's get the orig node of the REAL destination */
2451         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2452         if (!req_dst_orig_node)
2453                 goto out;
2454
2455         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2456         if (!res_dst_orig_node)
2457                 goto out;
2458
2459         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2460         req_ttvn = tt_data->ttvn;
2461
2462         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2463         /* this node doesn't have the requested data */
2464         if (orig_ttvn != req_ttvn ||
2465             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2466                                         ntohs(tt_data->num_vlan)))
2467                 goto out;
2468
2469         /* If the full table has been explicitly requested */
2470         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2471             !req_dst_orig_node->tt_buff)
2472                 full_table = true;
2473         else
2474                 full_table = false;
2475
2476         /* TT fragmentation hasn't been implemented yet, so send as many
2477          * TT entries fit a single packet as possible only
2478          */
2479         if (!full_table) {
2480                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2481                 tt_len = req_dst_orig_node->tt_buff_len;
2482
2483                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2484                                                               &tvlv_tt_data,
2485                                                               &tt_change,
2486                                                               &tt_len);
2487                 if (!tt_len)
2488                         goto unlock;
2489
2490                 /* Copy the last orig_node's OGM buffer */
2491                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2492                        req_dst_orig_node->tt_buff_len);
2493                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2494         } else {
2495                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2496                  * in the initial part
2497                  */
2498                 tt_len = -1;
2499                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2500                                                               &tvlv_tt_data,
2501                                                               &tt_change,
2502                                                               &tt_len);
2503                 if (!tt_len)
2504                         goto out;
2505
2506                 /* fill the rest of the tvlv with the real TT entries */
2507                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2508                                         tt_change, tt_len,
2509                                         batadv_tt_global_valid,
2510                                         req_dst_orig_node);
2511         }
2512
2513         /* Don't send the response, if larger than fragmented packet. */
2514         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2515         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2516                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2517                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2518                                          res_dst_orig_node->orig);
2519                 goto out;
2520         }
2521
2522         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2523         tvlv_tt_data->ttvn = req_ttvn;
2524
2525         if (full_table)
2526                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2527
2528         batadv_dbg(BATADV_DBG_TT, bat_priv,
2529                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2530                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2531                    full_table ? 'F' : '.', req_ttvn);
2532
2533         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2534
2535         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2536                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2537                                  tvlv_len);
2538
2539         ret = true;
2540         goto out;
2541
2542 unlock:
2543         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2544
2545 out:
2546         if (res_dst_orig_node)
2547                 batadv_orig_node_free_ref(res_dst_orig_node);
2548         if (req_dst_orig_node)
2549                 batadv_orig_node_free_ref(req_dst_orig_node);
2550         kfree(tvlv_tt_data);
2551         return ret;
2552 }
2553
2554 /**
2555  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2556  *  translation table
2557  * @bat_priv: the bat priv with all the soft interface information
2558  * @tt_data: tt data containing the tt request information
2559  * @req_src: mac address of tt request sender
2560  *
2561  * Returns true if tt request reply was sent, false otherwise.
2562  */
2563 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2564                                        struct batadv_tvlv_tt_data *tt_data,
2565                                        uint8_t *req_src)
2566 {
2567         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2568         struct batadv_hard_iface *primary_if = NULL;
2569         struct batadv_tvlv_tt_change *tt_change;
2570         struct batadv_orig_node *orig_node;
2571         uint8_t my_ttvn, req_ttvn;
2572         uint16_t tvlv_len;
2573         bool full_table;
2574         int32_t tt_len;
2575
2576         batadv_dbg(BATADV_DBG_TT, bat_priv,
2577                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2578                    req_src, tt_data->ttvn,
2579                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2580
2581         spin_lock_bh(&bat_priv->tt.commit_lock);
2582
2583         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2584         req_ttvn = tt_data->ttvn;
2585
2586         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2587         if (!orig_node)
2588                 goto out;
2589
2590         primary_if = batadv_primary_if_get_selected(bat_priv);
2591         if (!primary_if)
2592                 goto out;
2593
2594         /* If the full table has been explicitly requested or the gap
2595          * is too big send the whole local translation table
2596          */
2597         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2598             !bat_priv->tt.last_changeset)
2599                 full_table = true;
2600         else
2601                 full_table = false;
2602
2603         /* TT fragmentation hasn't been implemented yet, so send as many
2604          * TT entries fit a single packet as possible only
2605          */
2606         if (!full_table) {
2607                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2608
2609                 tt_len = bat_priv->tt.last_changeset_len;
2610                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2611                                                              &tvlv_tt_data,
2612                                                              &tt_change,
2613                                                              &tt_len);
2614                 if (!tt_len)
2615                         goto unlock;
2616
2617                 /* Copy the last orig_node's OGM buffer */
2618                 memcpy(tt_change, bat_priv->tt.last_changeset,
2619                        bat_priv->tt.last_changeset_len);
2620                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2621         } else {
2622                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2623
2624                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2625                  * in the initial part
2626                  */
2627                 tt_len = -1;
2628                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2629                                                              &tvlv_tt_data,
2630                                                              &tt_change,
2631                                                              &tt_len);
2632                 if (!tt_len)
2633                         goto out;
2634
2635                 /* fill the rest of the tvlv with the real TT entries */
2636                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2637                                         tt_change, tt_len,
2638                                         batadv_tt_local_valid, NULL);
2639         }
2640
2641         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2642         tvlv_tt_data->ttvn = req_ttvn;
2643
2644         if (full_table)
2645                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2646
2647         batadv_dbg(BATADV_DBG_TT, bat_priv,
2648                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2649                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2650
2651         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2652
2653         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2654                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2655                                  tvlv_len);
2656
2657         goto out;
2658
2659 unlock:
2660         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2661 out:
2662         spin_unlock_bh(&bat_priv->tt.commit_lock);
2663         if (orig_node)
2664                 batadv_orig_node_free_ref(orig_node);
2665         if (primary_if)
2666                 batadv_hardif_free_ref(primary_if);
2667         kfree(tvlv_tt_data);
2668         /* The packet was for this host, so it doesn't need to be re-routed */
2669         return true;
2670 }
2671
2672 /**
2673  * batadv_send_tt_response - send reply to tt request
2674  * @bat_priv: the bat priv with all the soft interface information
2675  * @tt_data: tt data containing the tt request information
2676  * @req_src: mac address of tt request sender
2677  * @req_dst: mac address of tt request recipient
2678  *
2679  * Returns true if tt request reply was sent, false otherwise.
2680  */
2681 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2682                                     struct batadv_tvlv_tt_data *tt_data,
2683                                     uint8_t *req_src, uint8_t *req_dst)
2684 {
2685         if (batadv_is_my_mac(bat_priv, req_dst))
2686                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2687         else
2688                 return batadv_send_other_tt_response(bat_priv, tt_data,
2689                                                      req_src, req_dst);
2690 }
2691
2692 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2693                                       struct batadv_orig_node *orig_node,
2694                                       struct batadv_tvlv_tt_change *tt_change,
2695                                       uint16_t tt_num_changes, uint8_t ttvn)
2696 {
2697         int i;
2698         int roams;
2699
2700         for (i = 0; i < tt_num_changes; i++) {
2701                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2702                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2703                         batadv_tt_global_del(bat_priv, orig_node,
2704                                              (tt_change + i)->addr,
2705                                              ntohs((tt_change + i)->vid),
2706                                              "tt removed by changes",
2707                                              roams);
2708                 } else {
2709                         if (!batadv_tt_global_add(bat_priv, orig_node,
2710                                                   (tt_change + i)->addr,
2711                                                   ntohs((tt_change + i)->vid),
2712                                                   (tt_change + i)->flags, ttvn))
2713                                 /* In case of problem while storing a
2714                                  * global_entry, we stop the updating
2715                                  * procedure without committing the
2716                                  * ttvn change. This will avoid to send
2717                                  * corrupted data on tt_request
2718                                  */
2719                                 return;
2720                 }
2721         }
2722         orig_node->tt_initialised = true;
2723 }
2724
2725 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2726                                   struct batadv_tvlv_tt_change *tt_change,
2727                                   uint8_t ttvn, uint8_t *resp_src,
2728                                   uint16_t num_entries)
2729 {
2730         struct batadv_orig_node *orig_node;
2731
2732         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2733         if (!orig_node)
2734                 goto out;
2735
2736         /* Purge the old table first.. */
2737         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2738                                   "Received full table");
2739
2740         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2741                                   ttvn);
2742
2743         spin_lock_bh(&orig_node->tt_buff_lock);
2744         kfree(orig_node->tt_buff);
2745         orig_node->tt_buff_len = 0;
2746         orig_node->tt_buff = NULL;
2747         spin_unlock_bh(&orig_node->tt_buff_lock);
2748
2749         atomic_set(&orig_node->last_ttvn, ttvn);
2750
2751 out:
2752         if (orig_node)
2753                 batadv_orig_node_free_ref(orig_node);
2754 }
2755
2756 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2757                                      struct batadv_orig_node *orig_node,
2758                                      uint16_t tt_num_changes, uint8_t ttvn,
2759                                      struct batadv_tvlv_tt_change *tt_change)
2760 {
2761         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2762                                   tt_num_changes, ttvn);
2763
2764         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2765                                    batadv_tt_len(tt_num_changes));
2766         atomic_set(&orig_node->last_ttvn, ttvn);
2767 }
2768
2769 /**
2770  * batadv_is_my_client - check if a client is served by the local node
2771  * @bat_priv: the bat priv with all the soft interface information
2772  * @addr: the mac adress of the client to check
2773  * @vid: VLAN identifier
2774  *
2775  * Returns true if the client is served by this node, false otherwise.
2776  */
2777 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2778                          unsigned short vid)
2779 {
2780         struct batadv_tt_local_entry *tt_local_entry;
2781         bool ret = false;
2782
2783         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2784         if (!tt_local_entry)
2785                 goto out;
2786         /* Check if the client has been logically deleted (but is kept for
2787          * consistency purpose)
2788          */
2789         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2790             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2791                 goto out;
2792         ret = true;
2793 out:
2794         if (tt_local_entry)
2795                 batadv_tt_local_entry_free_ref(tt_local_entry);
2796         return ret;
2797 }
2798
2799 /**
2800  * batadv_handle_tt_response - process incoming tt reply
2801  * @bat_priv: the bat priv with all the soft interface information
2802  * @tt_data: tt data containing the tt request information
2803  * @resp_src: mac address of tt reply sender
2804  * @num_entries: number of tt change entries appended to the tt data
2805  */
2806 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2807                                       struct batadv_tvlv_tt_data *tt_data,
2808                                       uint8_t *resp_src, uint16_t num_entries)
2809 {
2810         struct batadv_tt_req_node *node, *safe;
2811         struct batadv_orig_node *orig_node = NULL;
2812         struct batadv_tvlv_tt_change *tt_change;
2813         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2814         uint16_t change_offset;
2815
2816         batadv_dbg(BATADV_DBG_TT, bat_priv,
2817                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2818                    resp_src, tt_data->ttvn, num_entries,
2819                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2820
2821         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2822         if (!orig_node)
2823                 goto out;
2824
2825         spin_lock_bh(&orig_node->tt_lock);
2826
2827         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2828         change_offset *= ntohs(tt_data->num_vlan);
2829         change_offset += sizeof(*tt_data);
2830         tvlv_ptr += change_offset;
2831
2832         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2833         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2834                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2835                                       resp_src, num_entries);
2836         } else {
2837                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2838                                          tt_data->ttvn, tt_change);
2839         }
2840
2841         /* Recalculate the CRC for this orig_node and store it */
2842         batadv_tt_global_update_crc(bat_priv, orig_node);
2843
2844         spin_unlock_bh(&orig_node->tt_lock);
2845
2846         /* Delete the tt_req_node from pending tt_requests list */
2847         spin_lock_bh(&bat_priv->tt.req_list_lock);
2848         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2849                 if (!batadv_compare_eth(node->addr, resp_src))
2850                         continue;
2851                 list_del(&node->list);
2852                 kfree(node);
2853         }
2854
2855         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2856 out:
2857         if (orig_node)
2858                 batadv_orig_node_free_ref(orig_node);
2859 }
2860
2861 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2862 {
2863         struct batadv_tt_roam_node *node, *safe;
2864
2865         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2866
2867         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2868                 list_del(&node->list);
2869                 kfree(node);
2870         }
2871
2872         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2873 }
2874
2875 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2876 {
2877         struct batadv_tt_roam_node *node, *safe;
2878
2879         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2880         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2881                 if (!batadv_has_timed_out(node->first_time,
2882                                           BATADV_ROAMING_MAX_TIME))
2883                         continue;
2884
2885                 list_del(&node->list);
2886                 kfree(node);
2887         }
2888         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2889 }
2890
2891 /* This function checks whether the client already reached the
2892  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2893  * will not be sent.
2894  *
2895  * returns true if the ROAMING_ADV can be sent, false otherwise
2896  */
2897 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2898                                        uint8_t *client)
2899 {
2900         struct batadv_tt_roam_node *tt_roam_node;
2901         bool ret = false;
2902
2903         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2904         /* The new tt_req will be issued only if I'm not waiting for a
2905          * reply from the same orig_node yet
2906          */
2907         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2908                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2909                         continue;
2910
2911                 if (batadv_has_timed_out(tt_roam_node->first_time,
2912                                          BATADV_ROAMING_MAX_TIME))
2913                         continue;
2914
2915                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2916                         /* Sorry, you roamed too many times! */
2917                         goto unlock;
2918                 ret = true;
2919                 break;
2920         }
2921
2922         if (!ret) {
2923                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2924                 if (!tt_roam_node)
2925                         goto unlock;
2926
2927                 tt_roam_node->first_time = jiffies;
2928                 atomic_set(&tt_roam_node->counter,
2929                            BATADV_ROAMING_MAX_COUNT - 1);
2930                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2931
2932                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2933                 ret = true;
2934         }
2935
2936 unlock:
2937         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2938         return ret;
2939 }
2940
2941 /**
2942  * batadv_send_roam_adv - send a roaming advertisement message
2943  * @bat_priv: the bat priv with all the soft interface information
2944  * @client: mac address of the roaming client
2945  * @vid: VLAN identifier
2946  * @orig_node: message destination
2947  *
2948  * Send a ROAMING_ADV message to the node which was previously serving this
2949  * client. This is done to inform the node that from now on all traffic destined
2950  * for this particular roamed client has to be forwarded to the sender of the
2951  * roaming message.
2952  */
2953 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2954                                  unsigned short vid,
2955                                  struct batadv_orig_node *orig_node)
2956 {
2957         struct batadv_hard_iface *primary_if;
2958         struct batadv_tvlv_roam_adv tvlv_roam;
2959
2960         primary_if = batadv_primary_if_get_selected(bat_priv);
2961         if (!primary_if)
2962                 goto out;
2963
2964         /* before going on we have to check whether the client has
2965          * already roamed to us too many times
2966          */
2967         if (!batadv_tt_check_roam_count(bat_priv, client))
2968                 goto out;
2969
2970         batadv_dbg(BATADV_DBG_TT, bat_priv,
2971                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2972                    orig_node->orig, client, BATADV_PRINT_VID(vid));
2973
2974         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2975
2976         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
2977         tvlv_roam.vid = htons(vid);
2978
2979         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2980                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
2981                                  &tvlv_roam, sizeof(tvlv_roam));
2982
2983 out:
2984         if (primary_if)
2985                 batadv_hardif_free_ref(primary_if);
2986 }
2987
2988 static void batadv_tt_purge(struct work_struct *work)
2989 {
2990         struct delayed_work *delayed_work;
2991         struct batadv_priv_tt *priv_tt;
2992         struct batadv_priv *bat_priv;
2993
2994         delayed_work = container_of(work, struct delayed_work, work);
2995         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2996         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2997
2998         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
2999         batadv_tt_global_purge(bat_priv);
3000         batadv_tt_req_purge(bat_priv);
3001         batadv_tt_roam_purge(bat_priv);
3002
3003         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3004                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3005 }
3006
3007 void batadv_tt_free(struct batadv_priv *bat_priv)
3008 {
3009         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3010         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3011
3012         cancel_delayed_work_sync(&bat_priv->tt.work);
3013
3014         batadv_tt_local_table_free(bat_priv);
3015         batadv_tt_global_table_free(bat_priv);
3016         batadv_tt_req_list_free(bat_priv);
3017         batadv_tt_changes_list_free(bat_priv);
3018         batadv_tt_roam_list_free(bat_priv);
3019
3020         kfree(bat_priv->tt.last_changeset);
3021 }
3022
3023 /**
3024  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3025  *  table and possibly count them in the TT size
3026  * @bat_priv: the bat priv with all the soft interface information
3027  * @flags: the flag to switch
3028  * @enable: whether to set or unset the flag
3029  * @count: whether to increase the TT size by the number of changed entries
3030  */
3031 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3032                                       uint16_t flags, bool enable, bool count)
3033 {
3034         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3035         struct batadv_tt_common_entry *tt_common_entry;
3036         uint16_t changed_num = 0;
3037         struct hlist_head *head;
3038         uint32_t i;
3039
3040         if (!hash)
3041                 return;
3042
3043         for (i = 0; i < hash->size; i++) {
3044                 head = &hash->table[i];
3045
3046                 rcu_read_lock();
3047                 hlist_for_each_entry_rcu(tt_common_entry,
3048                                          head, hash_entry) {
3049                         if (enable) {
3050                                 if ((tt_common_entry->flags & flags) == flags)
3051                                         continue;
3052                                 tt_common_entry->flags |= flags;
3053                         } else {
3054                                 if (!(tt_common_entry->flags & flags))
3055                                         continue;
3056                                 tt_common_entry->flags &= ~flags;
3057                         }
3058                         changed_num++;
3059
3060                         if (!count)
3061                                 continue;
3062
3063                         batadv_tt_local_size_inc(bat_priv,
3064                                                  tt_common_entry->vid);
3065                 }
3066                 rcu_read_unlock();
3067         }
3068 }
3069
3070 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3071 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3072 {
3073         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3074         struct batadv_tt_common_entry *tt_common;
3075         struct batadv_tt_local_entry *tt_local;
3076         struct hlist_node *node_tmp;
3077         struct hlist_head *head;
3078         spinlock_t *list_lock; /* protects write access to the hash lists */
3079         uint32_t i;
3080
3081         if (!hash)
3082                 return;
3083
3084         for (i = 0; i < hash->size; i++) {
3085                 head = &hash->table[i];
3086                 list_lock = &hash->list_locks[i];
3087
3088                 spin_lock_bh(list_lock);
3089                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3090                                           hash_entry) {
3091                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3092                                 continue;
3093
3094                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3095                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3096                                    tt_common->addr,
3097                                    BATADV_PRINT_VID(tt_common->vid));
3098
3099                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3100                         hlist_del_rcu(&tt_common->hash_entry);
3101                         tt_local = container_of(tt_common,
3102                                                 struct batadv_tt_local_entry,
3103                                                 common);
3104                         batadv_tt_local_entry_free_ref(tt_local);
3105                 }
3106                 spin_unlock_bh(list_lock);
3107         }
3108 }
3109
3110 /**
3111  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3112  *  which have been queued in the time since the last commit
3113  * @bat_priv: the bat priv with all the soft interface information
3114  *
3115  * Caller must hold tt->commit_lock.
3116  */
3117 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3118 {
3119         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3120                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3121                         batadv_tt_tvlv_container_update(bat_priv);
3122                 return;
3123         }
3124
3125         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3126
3127         batadv_tt_local_purge_pending_clients(bat_priv);
3128         batadv_tt_local_update_crc(bat_priv);
3129
3130         /* Increment the TTVN only once per OGM interval */
3131         atomic_inc(&bat_priv->tt.vn);
3132         batadv_dbg(BATADV_DBG_TT, bat_priv,
3133                    "Local changes committed, updating to ttvn %u\n",
3134                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3135
3136         /* reset the sending counter */
3137         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3138         batadv_tt_tvlv_container_update(bat_priv);
3139 }
3140
3141 /**
3142  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3143  *  have been queued in the time since the last commit
3144  * @bat_priv: the bat priv with all the soft interface information
3145  */
3146 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3147 {
3148         spin_lock_bh(&bat_priv->tt.commit_lock);
3149         batadv_tt_local_commit_changes_nolock(bat_priv);
3150         spin_unlock_bh(&bat_priv->tt.commit_lock);
3151 }
3152
3153 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3154                            uint8_t *dst, unsigned short vid)
3155 {
3156         struct batadv_tt_local_entry *tt_local_entry = NULL;
3157         struct batadv_tt_global_entry *tt_global_entry = NULL;
3158         struct batadv_softif_vlan *vlan;
3159         bool ret = false;
3160
3161         vlan = batadv_softif_vlan_get(bat_priv, vid);
3162         if (!vlan || !atomic_read(&vlan->ap_isolation))
3163                 goto out;
3164
3165         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3166         if (!tt_local_entry)
3167                 goto out;
3168
3169         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3170         if (!tt_global_entry)
3171                 goto out;
3172
3173         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3174                 goto out;
3175
3176         ret = true;
3177
3178 out:
3179         if (vlan)
3180                 batadv_softif_vlan_free_ref(vlan);
3181         if (tt_global_entry)
3182                 batadv_tt_global_entry_free_ref(tt_global_entry);
3183         if (tt_local_entry)
3184                 batadv_tt_local_entry_free_ref(tt_local_entry);
3185         return ret;
3186 }
3187
3188 /**
3189  * batadv_tt_update_orig - update global translation table with new tt
3190  *  information received via ogms
3191  * @bat_priv: the bat priv with all the soft interface information
3192  * @orig: the orig_node of the ogm
3193  * @tt_vlan: pointer to the first tvlv VLAN entry
3194  * @tt_num_vlan: number of tvlv VLAN entries
3195  * @tt_change: pointer to the first entry in the TT buffer
3196  * @tt_num_changes: number of tt changes inside the tt buffer
3197  * @ttvn: translation table version number of this changeset
3198  * @tt_crc: crc32 checksum of orig node's translation table
3199  */
3200 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3201                                   struct batadv_orig_node *orig_node,
3202                                   const void *tt_buff, uint16_t tt_num_vlan,
3203                                   struct batadv_tvlv_tt_change *tt_change,
3204                                   uint16_t tt_num_changes, uint8_t ttvn)
3205 {
3206         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3207         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3208         bool full_table = true;
3209
3210         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3211         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3212          * increased by one -> we can apply the attached changes
3213          */
3214         if ((!orig_node->tt_initialised && ttvn == 1) ||
3215             ttvn - orig_ttvn == 1) {
3216                 /* the OGM could not contain the changes due to their size or
3217                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3218                  * times.
3219                  * In this case send a tt request
3220                  */
3221                 if (!tt_num_changes) {
3222                         full_table = false;
3223                         goto request_table;
3224                 }
3225
3226                 spin_lock_bh(&orig_node->tt_lock);
3227
3228                 tt_change = (struct batadv_tvlv_tt_change *)tt_buff;
3229                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3230                                          ttvn, tt_change);
3231
3232                 /* Even if we received the precomputed crc with the OGM, we
3233                  * prefer to recompute it to spot any possible inconsistency
3234                  * in the global table
3235                  */
3236                 batadv_tt_global_update_crc(bat_priv, orig_node);
3237
3238                 spin_unlock_bh(&orig_node->tt_lock);
3239
3240                 /* The ttvn alone is not enough to guarantee consistency
3241                  * because a single value could represent different states
3242                  * (due to the wrap around). Thus a node has to check whether
3243                  * the resulting table (after applying the changes) is still
3244                  * consistent or not. E.g. a node could disconnect while its
3245                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3246                  * checking the CRC value is mandatory to detect the
3247                  * inconsistency
3248                  */
3249                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3250                                                 tt_num_vlan))
3251                         goto request_table;
3252         } else {
3253                 /* if we missed more than one change or our tables are not
3254                  * in sync anymore -> request fresh tt data
3255                  */
3256                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
3257                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3258                                                 tt_num_vlan)) {
3259 request_table:
3260                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3261                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3262                                    orig_node->orig, ttvn, orig_ttvn,
3263                                    tt_num_changes);
3264                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3265                                                tt_vlan, tt_num_vlan,
3266                                                full_table);
3267                         return;
3268                 }
3269         }
3270 }
3271
3272 /**
3273  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3274  * @bat_priv: the bat priv with all the soft interface information
3275  * @addr: the mac address of the client to check
3276  * @vid: VLAN identifier
3277  *
3278  * Returns true if we know that the client has moved from its old originator
3279  * to another one. This entry is still kept for consistency purposes and will be
3280  * deleted later by a DEL or because of timeout
3281  */
3282 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3283                                         uint8_t *addr, unsigned short vid)
3284 {
3285         struct batadv_tt_global_entry *tt_global_entry;
3286         bool ret = false;
3287
3288         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3289         if (!tt_global_entry)
3290                 goto out;
3291
3292         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3293         batadv_tt_global_entry_free_ref(tt_global_entry);
3294 out:
3295         return ret;
3296 }
3297
3298 /**
3299  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3300  * @bat_priv: the bat priv with all the soft interface information
3301  * @addr: the mac address of the local client to query
3302  * @vid: VLAN identifier
3303  *
3304  * Returns true if the local client is known to be roaming (it is not served by
3305  * this node anymore) or not. If yes, the client is still present in the table
3306  * to keep the latter consistent with the node TTVN
3307  */
3308 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3309                                        uint8_t *addr, unsigned short vid)
3310 {
3311         struct batadv_tt_local_entry *tt_local_entry;
3312         bool ret = false;
3313
3314         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3315         if (!tt_local_entry)
3316                 goto out;
3317
3318         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3319         batadv_tt_local_entry_free_ref(tt_local_entry);
3320 out:
3321         return ret;
3322 }
3323
3324 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3325                                           struct batadv_orig_node *orig_node,
3326                                           const unsigned char *addr,
3327                                           unsigned short vid)
3328 {
3329         bool ret = false;
3330
3331         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3332                                   BATADV_TT_CLIENT_TEMP,
3333                                   atomic_read(&orig_node->last_ttvn)))
3334                 goto out;
3335
3336         batadv_dbg(BATADV_DBG_TT, bat_priv,
3337                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3338                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3339         ret = true;
3340 out:
3341         return ret;
3342 }
3343
3344 /**
3345  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3346  *  maximum packet size that can be transported through the mesh
3347  * @soft_iface: netdev struct of the mesh interface
3348  *
3349  * Remove entries older than 'timeout' and half timeout if more entries need
3350  * to be removed.
3351  */
3352 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3353 {
3354         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3355         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3356         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3357         bool reduced = false;
3358
3359         spin_lock_bh(&bat_priv->tt.commit_lock);
3360
3361         while (true) {
3362                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3363                 if (packet_size_max >= table_size)
3364                         break;
3365
3366                 batadv_tt_local_purge(bat_priv, timeout);
3367                 batadv_tt_local_purge_pending_clients(bat_priv);
3368
3369                 timeout /= 2;
3370                 reduced = true;
3371                 net_ratelimited_function(batadv_info, soft_iface,
3372                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3373                                          packet_size_max);
3374         }
3375
3376         /* commit these changes immediately, to avoid synchronization problem
3377          * with the TTVN
3378          */
3379         if (reduced)
3380                 batadv_tt_local_commit_changes_nolock(bat_priv);
3381
3382         spin_unlock_bh(&bat_priv->tt.commit_lock);
3383 }
3384
3385 /**
3386  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3387  * @bat_priv: the bat priv with all the soft interface information
3388  * @orig: the orig_node of the ogm
3389  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3390  * @tvlv_value: tvlv buffer containing the gateway data
3391  * @tvlv_value_len: tvlv buffer length
3392  */
3393 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3394                                           struct batadv_orig_node *orig,
3395                                           uint8_t flags, void *tvlv_value,
3396                                           uint16_t tvlv_value_len)
3397 {
3398         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3399         struct batadv_tvlv_tt_change *tt_change;
3400         struct batadv_tvlv_tt_data *tt_data;
3401         uint16_t num_entries, num_vlan;
3402
3403         if (tvlv_value_len < sizeof(*tt_data))
3404                 return;
3405
3406         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3407         tvlv_value_len -= sizeof(*tt_data);
3408
3409         num_vlan = ntohs(tt_data->num_vlan);
3410
3411         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3412                 return;
3413
3414         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3415         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3416         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3417
3418         num_entries = batadv_tt_entries(tvlv_value_len);
3419
3420         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3421                               num_entries, tt_data->ttvn);
3422 }
3423
3424 /**
3425  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3426  *  container
3427  * @bat_priv: the bat priv with all the soft interface information
3428  * @src: mac address of tt tvlv sender
3429  * @dst: mac address of tt tvlv recipient
3430  * @tvlv_value: tvlv buffer containing the tt data
3431  * @tvlv_value_len: tvlv buffer length
3432  *
3433  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3434  * otherwise.
3435  */
3436 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3437                                              uint8_t *src, uint8_t *dst,
3438                                              void *tvlv_value,
3439                                              uint16_t tvlv_value_len)
3440 {
3441         struct batadv_tvlv_tt_data *tt_data;
3442         uint16_t tt_vlan_len, tt_num_entries;
3443         char tt_flag;
3444         bool ret;
3445
3446         if (tvlv_value_len < sizeof(*tt_data))
3447                 return NET_RX_SUCCESS;
3448
3449         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3450         tvlv_value_len -= sizeof(*tt_data);
3451
3452         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3453         tt_vlan_len *= ntohs(tt_data->num_vlan);
3454
3455         if (tvlv_value_len < tt_vlan_len)
3456                 return NET_RX_SUCCESS;
3457
3458         tvlv_value_len -= tt_vlan_len;
3459         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3460
3461         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3462         case BATADV_TT_REQUEST:
3463                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3464
3465                 /* If this node cannot provide a TT response the tt_request is
3466                  * forwarded
3467                  */
3468                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3469                 if (!ret) {
3470                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3471                                 tt_flag = 'F';
3472                         else
3473                                 tt_flag = '.';
3474
3475                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3476                                    "Routing TT_REQUEST to %pM [%c]\n",
3477                                    dst, tt_flag);
3478                         /* tvlv API will re-route the packet */
3479                         return NET_RX_DROP;
3480                 }
3481                 break;
3482         case BATADV_TT_RESPONSE:
3483                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3484
3485                 if (batadv_is_my_mac(bat_priv, dst)) {
3486                         batadv_handle_tt_response(bat_priv, tt_data,
3487                                                   src, tt_num_entries);
3488                         return NET_RX_SUCCESS;
3489                 }
3490
3491                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3492                         tt_flag =  'F';
3493                 else
3494                         tt_flag = '.';
3495
3496                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3497                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3498
3499                 /* tvlv API will re-route the packet */
3500                 return NET_RX_DROP;
3501         }
3502
3503         return NET_RX_SUCCESS;
3504 }
3505
3506 /**
3507  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3508  * @bat_priv: the bat priv with all the soft interface information
3509  * @src: mac address of tt tvlv sender
3510  * @dst: mac address of tt tvlv recipient
3511  * @tvlv_value: tvlv buffer containing the tt data
3512  * @tvlv_value_len: tvlv buffer length
3513  *
3514  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3515  * otherwise.
3516  */
3517 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3518                                                uint8_t *src, uint8_t *dst,
3519                                                void *tvlv_value,
3520                                                uint16_t tvlv_value_len)
3521 {
3522         struct batadv_tvlv_roam_adv *roaming_adv;
3523         struct batadv_orig_node *orig_node = NULL;
3524
3525         /* If this node is not the intended recipient of the
3526          * roaming advertisement the packet is forwarded
3527          * (the tvlv API will re-route the packet).
3528          */
3529         if (!batadv_is_my_mac(bat_priv, dst))
3530                 return NET_RX_DROP;
3531
3532         if (tvlv_value_len < sizeof(*roaming_adv))
3533                 goto out;
3534
3535         orig_node = batadv_orig_hash_find(bat_priv, src);
3536         if (!orig_node)
3537                 goto out;
3538
3539         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3540         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3541
3542         batadv_dbg(BATADV_DBG_TT, bat_priv,
3543                    "Received ROAMING_ADV from %pM (client %pM)\n",
3544                    src, roaming_adv->client);
3545
3546         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3547                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3548                              atomic_read(&orig_node->last_ttvn) + 1);
3549
3550 out:
3551         if (orig_node)
3552                 batadv_orig_node_free_ref(orig_node);
3553         return NET_RX_SUCCESS;
3554 }
3555
3556 /**
3557  * batadv_tt_init - initialise the translation table internals
3558  * @bat_priv: the bat priv with all the soft interface information
3559  *
3560  * Return 0 on success or negative error number in case of failure.
3561  */
3562 int batadv_tt_init(struct batadv_priv *bat_priv)
3563 {
3564         int ret;
3565
3566         /* synchronized flags must be remote */
3567         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3568
3569         ret = batadv_tt_local_init(bat_priv);
3570         if (ret < 0)
3571                 return ret;
3572
3573         ret = batadv_tt_global_init(bat_priv);
3574         if (ret < 0)
3575                 return ret;
3576
3577         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3578                                      batadv_tt_tvlv_unicast_handler_v1,
3579                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3580
3581         batadv_tvlv_handler_register(bat_priv, NULL,
3582                                      batadv_roam_tvlv_unicast_handler_v1,
3583                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3584
3585         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3586         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3587                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3588
3589         return 1;
3590 }