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, BATADV_IF_DEFAULT,
1409                                        best_router, BATADV_IF_DEFAULT) <= 0) {
1410                         batadv_neigh_node_free_ref(router);
1411                         continue;
1412                 }
1413
1414                 /* release the refcount for the "old" best */
1415                 if (best_router)
1416                         batadv_neigh_node_free_ref(best_router);
1417
1418                 best_entry = orig_entry;
1419                 best_router = router;
1420         }
1421
1422         if (best_router)
1423                 batadv_neigh_node_free_ref(best_router);
1424
1425         return best_entry;
1426 }
1427
1428 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1429  * for this global entry
1430  * @bat_priv: the bat priv with all the soft interface information
1431  * @tt_global_entry: global translation table entry to be printed
1432  * @seq: debugfs table seq_file struct
1433  *
1434  * This functon assumes the caller holds rcu_read_lock().
1435  */
1436 static void
1437 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1438                              struct batadv_tt_global_entry *tt_global_entry,
1439                              struct seq_file *seq)
1440 {
1441         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1442         struct batadv_tt_common_entry *tt_common_entry;
1443         struct batadv_orig_node_vlan *vlan;
1444         struct hlist_head *head;
1445         uint8_t last_ttvn;
1446         uint16_t flags;
1447
1448         tt_common_entry = &tt_global_entry->common;
1449         flags = tt_common_entry->flags;
1450
1451         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1452         if (best_entry) {
1453                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1454                                                  tt_common_entry->vid);
1455                 if (!vlan) {
1456                         seq_printf(seq,
1457                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1458                                    BATADV_PRINT_VID(tt_common_entry->vid),
1459                                    best_entry->orig_node->orig);
1460                         goto print_list;
1461                 }
1462
1463                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1464                 seq_printf(seq,
1465                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1466                            '*', tt_global_entry->common.addr,
1467                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1468                            best_entry->ttvn, best_entry->orig_node->orig,
1469                            last_ttvn, vlan->tt.crc,
1470                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1471                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1472                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1473                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1474
1475                 batadv_orig_node_vlan_free_ref(vlan);
1476         }
1477
1478 print_list:
1479         head = &tt_global_entry->orig_list;
1480
1481         hlist_for_each_entry_rcu(orig_entry, head, list) {
1482                 if (best_entry == orig_entry)
1483                         continue;
1484
1485                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1486                                                  tt_common_entry->vid);
1487                 if (!vlan) {
1488                         seq_printf(seq,
1489                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1490                                    BATADV_PRINT_VID(tt_common_entry->vid),
1491                                    orig_entry->orig_node->orig);
1492                         continue;
1493                 }
1494
1495                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1496                 seq_printf(seq,
1497                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1498                            '+', tt_global_entry->common.addr,
1499                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1500                            orig_entry->ttvn, orig_entry->orig_node->orig,
1501                            last_ttvn, vlan->tt.crc,
1502                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1503                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1504                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1505                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1506
1507                 batadv_orig_node_vlan_free_ref(vlan);
1508         }
1509 }
1510
1511 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1512 {
1513         struct net_device *net_dev = (struct net_device *)seq->private;
1514         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1515         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1516         struct batadv_tt_common_entry *tt_common_entry;
1517         struct batadv_tt_global_entry *tt_global;
1518         struct batadv_hard_iface *primary_if;
1519         struct hlist_head *head;
1520         uint32_t i;
1521
1522         primary_if = batadv_seq_print_text_primary_if_get(seq);
1523         if (!primary_if)
1524                 goto out;
1525
1526         seq_printf(seq,
1527                    "Globally announced TT entries received via the mesh %s\n",
1528                    net_dev->name);
1529         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1530                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1531                    "CRC", "Flags");
1532
1533         for (i = 0; i < hash->size; i++) {
1534                 head = &hash->table[i];
1535
1536                 rcu_read_lock();
1537                 hlist_for_each_entry_rcu(tt_common_entry,
1538                                          head, hash_entry) {
1539                         tt_global = container_of(tt_common_entry,
1540                                                  struct batadv_tt_global_entry,
1541                                                  common);
1542                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1543                 }
1544                 rcu_read_unlock();
1545         }
1546 out:
1547         if (primary_if)
1548                 batadv_hardif_free_ref(primary_if);
1549         return 0;
1550 }
1551
1552 /* deletes the orig list of a tt_global_entry */
1553 static void
1554 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1555 {
1556         struct hlist_head *head;
1557         struct hlist_node *safe;
1558         struct batadv_tt_orig_list_entry *orig_entry;
1559
1560         spin_lock_bh(&tt_global_entry->list_lock);
1561         head = &tt_global_entry->orig_list;
1562         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1563                 hlist_del_rcu(&orig_entry->list);
1564                 batadv_tt_global_size_dec(orig_entry->orig_node,
1565                                           tt_global_entry->common.vid);
1566                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1567         }
1568         spin_unlock_bh(&tt_global_entry->list_lock);
1569 }
1570
1571 static void
1572 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
1573                                 struct batadv_tt_global_entry *tt_global_entry,
1574                                 struct batadv_orig_node *orig_node,
1575                                 const char *message)
1576 {
1577         struct hlist_head *head;
1578         struct hlist_node *safe;
1579         struct batadv_tt_orig_list_entry *orig_entry;
1580         unsigned short vid;
1581
1582         spin_lock_bh(&tt_global_entry->list_lock);
1583         head = &tt_global_entry->orig_list;
1584         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1585                 if (orig_entry->orig_node == orig_node) {
1586                         vid = tt_global_entry->common.vid;
1587                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1588                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1589                                    orig_node->orig,
1590                                    tt_global_entry->common.addr,
1591                                    BATADV_PRINT_VID(vid), message);
1592                         hlist_del_rcu(&orig_entry->list);
1593                         batadv_tt_global_size_dec(orig_node,
1594                                                   tt_global_entry->common.vid);
1595                         batadv_tt_orig_list_entry_free_ref(orig_entry);
1596                 }
1597         }
1598         spin_unlock_bh(&tt_global_entry->list_lock);
1599 }
1600
1601 /* If the client is to be deleted, we check if it is the last origantor entry
1602  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1603  * timer, otherwise we simply remove the originator scheduled for deletion.
1604  */
1605 static void
1606 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1607                              struct batadv_tt_global_entry *tt_global_entry,
1608                              struct batadv_orig_node *orig_node,
1609                              const char *message)
1610 {
1611         bool last_entry = true;
1612         struct hlist_head *head;
1613         struct batadv_tt_orig_list_entry *orig_entry;
1614
1615         /* no local entry exists, case 1:
1616          * Check if this is the last one or if other entries exist.
1617          */
1618
1619         rcu_read_lock();
1620         head = &tt_global_entry->orig_list;
1621         hlist_for_each_entry_rcu(orig_entry, head, list) {
1622                 if (orig_entry->orig_node != orig_node) {
1623                         last_entry = false;
1624                         break;
1625                 }
1626         }
1627         rcu_read_unlock();
1628
1629         if (last_entry) {
1630                 /* its the last one, mark for roaming. */
1631                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1632                 tt_global_entry->roam_at = jiffies;
1633         } else
1634                 /* there is another entry, we can simply delete this
1635                  * one and can still use the other one.
1636                  */
1637                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1638                                                 orig_node, message);
1639 }
1640
1641 /**
1642  * batadv_tt_global_del - remove a client from the global table
1643  * @bat_priv: the bat priv with all the soft interface information
1644  * @orig_node: an originator serving this client
1645  * @addr: the mac address of the client
1646  * @vid: VLAN identifier
1647  * @message: a message explaining the reason for deleting the client to print
1648  *  for debugging purpose
1649  * @roaming: true if the deletion has been triggered by a roaming event
1650  */
1651 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1652                                  struct batadv_orig_node *orig_node,
1653                                  const unsigned char *addr, unsigned short vid,
1654                                  const char *message, bool roaming)
1655 {
1656         struct batadv_tt_global_entry *tt_global_entry;
1657         struct batadv_tt_local_entry *local_entry = NULL;
1658
1659         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1660         if (!tt_global_entry)
1661                 goto out;
1662
1663         if (!roaming) {
1664                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1665                                                 orig_node, message);
1666
1667                 if (hlist_empty(&tt_global_entry->orig_list))
1668                         batadv_tt_global_free(bat_priv, tt_global_entry,
1669                                               message);
1670
1671                 goto out;
1672         }
1673
1674         /* if we are deleting a global entry due to a roam
1675          * event, there are two possibilities:
1676          * 1) the client roamed from node A to node B => if there
1677          *    is only one originator left for this client, we mark
1678          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1679          *    wait for node B to claim it. In case of timeout
1680          *    the entry is purged.
1681          *
1682          *    If there are other originators left, we directly delete
1683          *    the originator.
1684          * 2) the client roamed to us => we can directly delete
1685          *    the global entry, since it is useless now.
1686          */
1687         local_entry = batadv_tt_local_hash_find(bat_priv,
1688                                                 tt_global_entry->common.addr,
1689                                                 vid);
1690         if (local_entry) {
1691                 /* local entry exists, case 2: client roamed to us. */
1692                 batadv_tt_global_del_orig_list(tt_global_entry);
1693                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1694         } else
1695                 /* no local entry exists, case 1: check for roaming */
1696                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1697                                              orig_node, message);
1698
1699
1700 out:
1701         if (tt_global_entry)
1702                 batadv_tt_global_entry_free_ref(tt_global_entry);
1703         if (local_entry)
1704                 batadv_tt_local_entry_free_ref(local_entry);
1705 }
1706
1707 /**
1708  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1709  *  given originator matching the provided vid
1710  * @bat_priv: the bat priv with all the soft interface information
1711  * @orig_node: the originator owning the entries to remove
1712  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1713  *  removed
1714  * @message: debug message to print as "reason"
1715  */
1716 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1717                                struct batadv_orig_node *orig_node,
1718                                int32_t match_vid,
1719                                const char *message)
1720 {
1721         struct batadv_tt_global_entry *tt_global;
1722         struct batadv_tt_common_entry *tt_common_entry;
1723         uint32_t i;
1724         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1725         struct hlist_node *safe;
1726         struct hlist_head *head;
1727         spinlock_t *list_lock; /* protects write access to the hash lists */
1728         unsigned short vid;
1729
1730         if (!hash)
1731                 return;
1732
1733         for (i = 0; i < hash->size; i++) {
1734                 head = &hash->table[i];
1735                 list_lock = &hash->list_locks[i];
1736
1737                 spin_lock_bh(list_lock);
1738                 hlist_for_each_entry_safe(tt_common_entry, safe,
1739                                           head, hash_entry) {
1740                         /* remove only matching entries */
1741                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1742                                 continue;
1743
1744                         tt_global = container_of(tt_common_entry,
1745                                                  struct batadv_tt_global_entry,
1746                                                  common);
1747
1748                         batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1749                                                         orig_node, message);
1750
1751                         if (hlist_empty(&tt_global->orig_list)) {
1752                                 vid = tt_global->common.vid;
1753                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1754                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1755                                            tt_global->common.addr,
1756                                            BATADV_PRINT_VID(vid), message);
1757                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1758                                 batadv_tt_global_entry_free_ref(tt_global);
1759                         }
1760                 }
1761                 spin_unlock_bh(list_lock);
1762         }
1763         orig_node->tt_initialised = false;
1764 }
1765
1766 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1767                                       char **msg)
1768 {
1769         bool purge = false;
1770         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1771         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1772
1773         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1774             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1775                 purge = true;
1776                 *msg = "Roaming timeout\n";
1777         }
1778
1779         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1780             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1781                 purge = true;
1782                 *msg = "Temporary client timeout\n";
1783         }
1784
1785         return purge;
1786 }
1787
1788 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1789 {
1790         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1791         struct hlist_head *head;
1792         struct hlist_node *node_tmp;
1793         spinlock_t *list_lock; /* protects write access to the hash lists */
1794         uint32_t i;
1795         char *msg = NULL;
1796         struct batadv_tt_common_entry *tt_common;
1797         struct batadv_tt_global_entry *tt_global;
1798
1799         for (i = 0; i < hash->size; i++) {
1800                 head = &hash->table[i];
1801                 list_lock = &hash->list_locks[i];
1802
1803                 spin_lock_bh(list_lock);
1804                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1805                                           hash_entry) {
1806                         tt_global = container_of(tt_common,
1807                                                  struct batadv_tt_global_entry,
1808                                                  common);
1809
1810                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1811                                 continue;
1812
1813                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1814                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1815                                    tt_global->common.addr,
1816                                    BATADV_PRINT_VID(tt_global->common.vid),
1817                                    msg);
1818
1819                         hlist_del_rcu(&tt_common->hash_entry);
1820
1821                         batadv_tt_global_entry_free_ref(tt_global);
1822                 }
1823                 spin_unlock_bh(list_lock);
1824         }
1825 }
1826
1827 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1828 {
1829         struct batadv_hashtable *hash;
1830         spinlock_t *list_lock; /* protects write access to the hash lists */
1831         struct batadv_tt_common_entry *tt_common_entry;
1832         struct batadv_tt_global_entry *tt_global;
1833         struct hlist_node *node_tmp;
1834         struct hlist_head *head;
1835         uint32_t i;
1836
1837         if (!bat_priv->tt.global_hash)
1838                 return;
1839
1840         hash = bat_priv->tt.global_hash;
1841
1842         for (i = 0; i < hash->size; i++) {
1843                 head = &hash->table[i];
1844                 list_lock = &hash->list_locks[i];
1845
1846                 spin_lock_bh(list_lock);
1847                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1848                                           head, hash_entry) {
1849                         hlist_del_rcu(&tt_common_entry->hash_entry);
1850                         tt_global = container_of(tt_common_entry,
1851                                                  struct batadv_tt_global_entry,
1852                                                  common);
1853                         batadv_tt_global_entry_free_ref(tt_global);
1854                 }
1855                 spin_unlock_bh(list_lock);
1856         }
1857
1858         batadv_hash_destroy(hash);
1859
1860         bat_priv->tt.global_hash = NULL;
1861 }
1862
1863 static bool
1864 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1865                        struct batadv_tt_global_entry *tt_global_entry)
1866 {
1867         bool ret = false;
1868
1869         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1870             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1871                 ret = true;
1872
1873         /* check if the two clients are marked as isolated */
1874         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
1875             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
1876                 ret = true;
1877
1878         return ret;
1879 }
1880
1881 /**
1882  * batadv_transtable_search - get the mesh destination for a given client
1883  * @bat_priv: the bat priv with all the soft interface information
1884  * @src: mac address of the source client
1885  * @addr: mac address of the destination client
1886  * @vid: VLAN identifier
1887  *
1888  * Returns a pointer to the originator that was selected as destination in the
1889  * mesh for contacting the client 'addr', NULL otherwise.
1890  * In case of multiple originators serving the same client, the function returns
1891  * the best one (best in terms of metric towards the destination node).
1892  *
1893  * If the two clients are AP isolated the function returns NULL.
1894  */
1895 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1896                                                   const uint8_t *src,
1897                                                   const uint8_t *addr,
1898                                                   unsigned short vid)
1899 {
1900         struct batadv_tt_local_entry *tt_local_entry = NULL;
1901         struct batadv_tt_global_entry *tt_global_entry = NULL;
1902         struct batadv_orig_node *orig_node = NULL;
1903         struct batadv_tt_orig_list_entry *best_entry;
1904
1905         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
1906                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1907                 if (!tt_local_entry ||
1908                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1909                         goto out;
1910         }
1911
1912         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1913         if (!tt_global_entry)
1914                 goto out;
1915
1916         /* check whether the clients should not communicate due to AP
1917          * isolation
1918          */
1919         if (tt_local_entry &&
1920             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1921                 goto out;
1922
1923         rcu_read_lock();
1924         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1925         /* found anything? */
1926         if (best_entry)
1927                 orig_node = best_entry->orig_node;
1928         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1929                 orig_node = NULL;
1930         rcu_read_unlock();
1931
1932 out:
1933         if (tt_global_entry)
1934                 batadv_tt_global_entry_free_ref(tt_global_entry);
1935         if (tt_local_entry)
1936                 batadv_tt_local_entry_free_ref(tt_local_entry);
1937
1938         return orig_node;
1939 }
1940
1941 /**
1942  * batadv_tt_global_crc - calculates the checksum of the local table belonging
1943  *  to the given orig_node
1944  * @bat_priv: the bat priv with all the soft interface information
1945  * @orig_node: originator for which the CRC should be computed
1946  * @vid: VLAN identifier for which the CRC32 has to be computed
1947  *
1948  * This function computes the checksum for the global table corresponding to a
1949  * specific originator. In particular, the checksum is computed as follows: For
1950  * each client connected to the originator the CRC32C of the MAC address and the
1951  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1952  * together.
1953  *
1954  * The idea behind is that CRC32C should be used as much as possible in order to
1955  * produce a unique hash of the table, but since the order which is used to feed
1956  * the CRC32C function affects the result and since every node in the network
1957  * probably sorts the clients differently, the hash function cannot be directly
1958  * computed over the entire table. Hence the CRC32C is used only on
1959  * the single client entry, while all the results are then xor'ed together
1960  * because the XOR operation can combine them all while trying to reduce the
1961  * noise as much as possible.
1962  *
1963  * Returns the checksum of the global table of a given originator.
1964  */
1965 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1966                                      struct batadv_orig_node *orig_node,
1967                                      unsigned short vid)
1968 {
1969         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1970         struct batadv_tt_common_entry *tt_common;
1971         struct batadv_tt_global_entry *tt_global;
1972         struct hlist_head *head;
1973         uint32_t i, crc_tmp, crc = 0;
1974         uint8_t flags;
1975
1976         for (i = 0; i < hash->size; i++) {
1977                 head = &hash->table[i];
1978
1979                 rcu_read_lock();
1980                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1981                         tt_global = container_of(tt_common,
1982                                                  struct batadv_tt_global_entry,
1983                                                  common);
1984                         /* compute the CRC only for entries belonging to the
1985                          * VLAN identified by the vid passed as parameter
1986                          */
1987                         if (tt_common->vid != vid)
1988                                 continue;
1989
1990                         /* Roaming clients are in the global table for
1991                          * consistency only. They don't have to be
1992                          * taken into account while computing the
1993                          * global crc
1994                          */
1995                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
1996                                 continue;
1997                         /* Temporary clients have not been announced yet, so
1998                          * they have to be skipped while computing the global
1999                          * crc
2000                          */
2001                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2002                                 continue;
2003
2004                         /* find out if this global entry is announced by this
2005                          * originator
2006                          */
2007                         if (!batadv_tt_global_entry_has_orig(tt_global,
2008                                                              orig_node))
2009                                 continue;
2010
2011                         crc_tmp = crc32c(0, &tt_common->vid,
2012                                          sizeof(tt_common->vid));
2013
2014                         /* compute the CRC on flags that have to be kept in sync
2015                          * among nodes
2016                          */
2017                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2018                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2019
2020                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2021                 }
2022                 rcu_read_unlock();
2023         }
2024
2025         return crc;
2026 }
2027
2028 /**
2029  * batadv_tt_local_crc - calculates the checksum of the local table
2030  * @bat_priv: the bat priv with all the soft interface information
2031  * @vid: VLAN identifier for which the CRC32 has to be computed
2032  *
2033  * For details about the computation, please refer to the documentation for
2034  * batadv_tt_global_crc().
2035  *
2036  * Returns the checksum of the local table
2037  */
2038 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2039                                     unsigned short vid)
2040 {
2041         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2042         struct batadv_tt_common_entry *tt_common;
2043         struct hlist_head *head;
2044         uint32_t i, crc_tmp, crc = 0;
2045         uint8_t flags;
2046
2047         for (i = 0; i < hash->size; i++) {
2048                 head = &hash->table[i];
2049
2050                 rcu_read_lock();
2051                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2052                         /* compute the CRC only for entries belonging to the
2053                          * VLAN identified by vid
2054                          */
2055                         if (tt_common->vid != vid)
2056                                 continue;
2057
2058                         /* not yet committed clients have not to be taken into
2059                          * account while computing the CRC
2060                          */
2061                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2062                                 continue;
2063
2064                         crc_tmp = crc32c(0, &tt_common->vid,
2065                                          sizeof(tt_common->vid));
2066
2067                         /* compute the CRC on flags that have to be kept in sync
2068                          * among nodes
2069                          */
2070                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2071                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2072
2073                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2074                 }
2075                 rcu_read_unlock();
2076         }
2077
2078         return crc;
2079 }
2080
2081 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2082 {
2083         struct batadv_tt_req_node *node, *safe;
2084
2085         spin_lock_bh(&bat_priv->tt.req_list_lock);
2086
2087         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2088                 list_del(&node->list);
2089                 kfree(node);
2090         }
2091
2092         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2093 }
2094
2095 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2096                                        struct batadv_orig_node *orig_node,
2097                                        const void *tt_buff,
2098                                        uint16_t tt_buff_len)
2099 {
2100         /* Replace the old buffer only if I received something in the
2101          * last OGM (the OGM could carry no changes)
2102          */
2103         spin_lock_bh(&orig_node->tt_buff_lock);
2104         if (tt_buff_len > 0) {
2105                 kfree(orig_node->tt_buff);
2106                 orig_node->tt_buff_len = 0;
2107                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2108                 if (orig_node->tt_buff) {
2109                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2110                         orig_node->tt_buff_len = tt_buff_len;
2111                 }
2112         }
2113         spin_unlock_bh(&orig_node->tt_buff_lock);
2114 }
2115
2116 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2117 {
2118         struct batadv_tt_req_node *node, *safe;
2119
2120         spin_lock_bh(&bat_priv->tt.req_list_lock);
2121         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2122                 if (batadv_has_timed_out(node->issued_at,
2123                                          BATADV_TT_REQUEST_TIMEOUT)) {
2124                         list_del(&node->list);
2125                         kfree(node);
2126                 }
2127         }
2128         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2129 }
2130
2131 /* returns the pointer to the new tt_req_node struct if no request
2132  * has already been issued for this orig_node, NULL otherwise
2133  */
2134 static struct batadv_tt_req_node *
2135 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2136                        struct batadv_orig_node *orig_node)
2137 {
2138         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2139
2140         spin_lock_bh(&bat_priv->tt.req_list_lock);
2141         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2142                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2143                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2144                                           BATADV_TT_REQUEST_TIMEOUT))
2145                         goto unlock;
2146         }
2147
2148         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2149         if (!tt_req_node)
2150                 goto unlock;
2151
2152         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
2153         tt_req_node->issued_at = jiffies;
2154
2155         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2156 unlock:
2157         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2158         return tt_req_node;
2159 }
2160
2161 /**
2162  * batadv_tt_local_valid - verify that given tt entry is a valid one
2163  * @entry_ptr: to be checked local tt entry
2164  * @data_ptr: not used but definition required to satisfy the callback prototype
2165  *
2166  * Returns 1 if the entry is a valid, 0 otherwise.
2167  */
2168 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2169 {
2170         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2171
2172         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2173                 return 0;
2174         return 1;
2175 }
2176
2177 static int batadv_tt_global_valid(const void *entry_ptr,
2178                                   const void *data_ptr)
2179 {
2180         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2181         const struct batadv_tt_global_entry *tt_global_entry;
2182         const struct batadv_orig_node *orig_node = data_ptr;
2183
2184         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2185             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2186                 return 0;
2187
2188         tt_global_entry = container_of(tt_common_entry,
2189                                        struct batadv_tt_global_entry,
2190                                        common);
2191
2192         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2193 }
2194
2195 /**
2196  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2197  *  specified tt hash
2198  * @bat_priv: the bat priv with all the soft interface information
2199  * @hash: hash table containing the tt entries
2200  * @tt_len: expected tvlv tt data buffer length in number of bytes
2201  * @tvlv_buff: pointer to the buffer to fill with the TT data
2202  * @valid_cb: function to filter tt change entries
2203  * @cb_data: data passed to the filter function as argument
2204  */
2205 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2206                                     struct batadv_hashtable *hash,
2207                                     void *tvlv_buff, uint16_t tt_len,
2208                                     int (*valid_cb)(const void *, const void *),
2209                                     void *cb_data)
2210 {
2211         struct batadv_tt_common_entry *tt_common_entry;
2212         struct batadv_tvlv_tt_change *tt_change;
2213         struct hlist_head *head;
2214         uint16_t tt_tot, tt_num_entries = 0;
2215         uint32_t i;
2216
2217         tt_tot = batadv_tt_entries(tt_len);
2218         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2219
2220         rcu_read_lock();
2221         for (i = 0; i < hash->size; i++) {
2222                 head = &hash->table[i];
2223
2224                 hlist_for_each_entry_rcu(tt_common_entry,
2225                                          head, hash_entry) {
2226                         if (tt_tot == tt_num_entries)
2227                                 break;
2228
2229                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2230                                 continue;
2231
2232                         memcpy(tt_change->addr, tt_common_entry->addr,
2233                                ETH_ALEN);
2234                         tt_change->flags = tt_common_entry->flags;
2235                         tt_change->vid = htons(tt_common_entry->vid);
2236                         memset(tt_change->reserved, 0,
2237                                sizeof(tt_change->reserved));
2238
2239                         tt_num_entries++;
2240                         tt_change++;
2241                 }
2242         }
2243         rcu_read_unlock();
2244 }
2245
2246 /**
2247  * batadv_tt_global_check_crc - check if all the CRCs are correct
2248  * @orig_node: originator for which the CRCs have to be checked
2249  * @tt_vlan: pointer to the first tvlv VLAN entry
2250  * @num_vlan: number of tvlv VLAN entries
2251  * @create: if true, create VLAN objects if not found
2252  *
2253  * Return true if all the received CRCs match the locally stored ones, false
2254  * otherwise
2255  */
2256 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2257                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2258                                        uint16_t num_vlan)
2259 {
2260         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2261         struct batadv_orig_node_vlan *vlan;
2262         int i;
2263
2264         /* check if each received CRC matches the locally stored one */
2265         for (i = 0; i < num_vlan; i++) {
2266                 tt_vlan_tmp = tt_vlan + i;
2267
2268                 /* if orig_node is a backbone node for this VLAN, don't check
2269                  * the CRC as we ignore all the global entries over it
2270                  */
2271                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2272                                                    orig_node->orig,
2273                                                    ntohs(tt_vlan_tmp->vid)))
2274                         continue;
2275
2276                 vlan = batadv_orig_node_vlan_get(orig_node,
2277                                                  ntohs(tt_vlan_tmp->vid));
2278                 if (!vlan)
2279                         return false;
2280
2281                 if (vlan->tt.crc != ntohl(tt_vlan_tmp->crc))
2282                         return false;
2283         }
2284
2285         return true;
2286 }
2287
2288 /**
2289  * batadv_tt_local_update_crc - update all the local CRCs
2290  * @bat_priv: the bat priv with all the soft interface information
2291  */
2292 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2293 {
2294         struct batadv_softif_vlan *vlan;
2295
2296         /* recompute the global CRC for each VLAN */
2297         rcu_read_lock();
2298         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2299                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2300         }
2301         rcu_read_unlock();
2302 }
2303
2304 /**
2305  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2306  * @bat_priv: the bat priv with all the soft interface information
2307  * @orig_node: the orig_node for which the CRCs have to be updated
2308  */
2309 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2310                                         struct batadv_orig_node *orig_node)
2311 {
2312         struct batadv_orig_node_vlan *vlan;
2313         uint32_t crc;
2314
2315         /* recompute the global CRC for each VLAN */
2316         rcu_read_lock();
2317         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2318                 /* if orig_node is a backbone node for this VLAN, don't compute
2319                  * the CRC as we ignore all the global entries over it
2320                  */
2321                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2322                                                    vlan->vid))
2323                         continue;
2324
2325                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2326                 vlan->tt.crc = crc;
2327         }
2328         rcu_read_unlock();
2329 }
2330
2331 /**
2332  * batadv_send_tt_request - send a TT Request message to a given node
2333  * @bat_priv: the bat priv with all the soft interface information
2334  * @dst_orig_node: the destination of the message
2335  * @ttvn: the version number that the source of the message is looking for
2336  * @tt_vlan: pointer to the first tvlv VLAN object to request
2337  * @num_vlan: number of tvlv VLAN entries
2338  * @full_table: ask for the entire translation table if true, while only for the
2339  *  last TT diff otherwise
2340  */
2341 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2342                                   struct batadv_orig_node *dst_orig_node,
2343                                   uint8_t ttvn,
2344                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2345                                   uint16_t num_vlan, bool full_table)
2346 {
2347         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2348         struct batadv_tt_req_node *tt_req_node = NULL;
2349         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2350         struct batadv_hard_iface *primary_if;
2351         bool ret = false;
2352         int i, size;
2353
2354         primary_if = batadv_primary_if_get_selected(bat_priv);
2355         if (!primary_if)
2356                 goto out;
2357
2358         /* The new tt_req will be issued only if I'm not waiting for a
2359          * reply from the same orig_node yet
2360          */
2361         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2362         if (!tt_req_node)
2363                 goto out;
2364
2365         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2366         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2367         if (!tvlv_tt_data)
2368                 goto out;
2369
2370         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2371         tvlv_tt_data->ttvn = ttvn;
2372         tvlv_tt_data->num_vlan = htons(num_vlan);
2373
2374         /* send all the CRCs within the request. This is needed by intermediate
2375          * nodes to ensure they have the correct table before replying
2376          */
2377         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2378         for (i = 0; i < num_vlan; i++) {
2379                 tt_vlan_req->vid = tt_vlan->vid;
2380                 tt_vlan_req->crc = tt_vlan->crc;
2381
2382                 tt_vlan_req++;
2383                 tt_vlan++;
2384         }
2385
2386         if (full_table)
2387                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2388
2389         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2390                    dst_orig_node->orig, full_table ? 'F' : '.');
2391
2392         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2393         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2394                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2395                                  tvlv_tt_data, size);
2396         ret = true;
2397
2398 out:
2399         if (primary_if)
2400                 batadv_hardif_free_ref(primary_if);
2401         if (ret && tt_req_node) {
2402                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2403                 list_del(&tt_req_node->list);
2404                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2405                 kfree(tt_req_node);
2406         }
2407         kfree(tvlv_tt_data);
2408         return ret;
2409 }
2410
2411 /**
2412  * batadv_send_other_tt_response - send reply to tt request concerning another
2413  *  node's translation table
2414  * @bat_priv: the bat priv with all the soft interface information
2415  * @tt_data: tt data containing the tt request information
2416  * @req_src: mac address of tt request sender
2417  * @req_dst: mac address of tt request recipient
2418  *
2419  * Returns true if tt request reply was sent, false otherwise.
2420  */
2421 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2422                                           struct batadv_tvlv_tt_data *tt_data,
2423                                           uint8_t *req_src, uint8_t *req_dst)
2424 {
2425         struct batadv_orig_node *req_dst_orig_node;
2426         struct batadv_orig_node *res_dst_orig_node = NULL;
2427         struct batadv_tvlv_tt_change *tt_change;
2428         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2429         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2430         bool ret = false, full_table;
2431         uint8_t orig_ttvn, req_ttvn;
2432         uint16_t tvlv_len;
2433         int32_t tt_len;
2434
2435         batadv_dbg(BATADV_DBG_TT, bat_priv,
2436                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2437                    req_src, tt_data->ttvn, req_dst,
2438                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2439
2440         /* Let's get the orig node of the REAL destination */
2441         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2442         if (!req_dst_orig_node)
2443                 goto out;
2444
2445         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2446         if (!res_dst_orig_node)
2447                 goto out;
2448
2449         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2450         req_ttvn = tt_data->ttvn;
2451
2452         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2453         /* this node doesn't have the requested data */
2454         if (orig_ttvn != req_ttvn ||
2455             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2456                                         ntohs(tt_data->num_vlan)))
2457                 goto out;
2458
2459         /* If the full table has been explicitly requested */
2460         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2461             !req_dst_orig_node->tt_buff)
2462                 full_table = true;
2463         else
2464                 full_table = false;
2465
2466         /* TT fragmentation hasn't been implemented yet, so send as many
2467          * TT entries fit a single packet as possible only
2468          */
2469         if (!full_table) {
2470                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2471                 tt_len = req_dst_orig_node->tt_buff_len;
2472
2473                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2474                                                               &tvlv_tt_data,
2475                                                               &tt_change,
2476                                                               &tt_len);
2477                 if (!tt_len)
2478                         goto unlock;
2479
2480                 /* Copy the last orig_node's OGM buffer */
2481                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2482                        req_dst_orig_node->tt_buff_len);
2483                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2484         } else {
2485                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2486                  * in the initial part
2487                  */
2488                 tt_len = -1;
2489                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2490                                                               &tvlv_tt_data,
2491                                                               &tt_change,
2492                                                               &tt_len);
2493                 if (!tt_len)
2494                         goto out;
2495
2496                 /* fill the rest of the tvlv with the real TT entries */
2497                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2498                                         tt_change, tt_len,
2499                                         batadv_tt_global_valid,
2500                                         req_dst_orig_node);
2501         }
2502
2503         /* Don't send the response, if larger than fragmented packet. */
2504         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2505         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2506                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2507                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2508                                          res_dst_orig_node->orig);
2509                 goto out;
2510         }
2511
2512         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2513         tvlv_tt_data->ttvn = req_ttvn;
2514
2515         if (full_table)
2516                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2517
2518         batadv_dbg(BATADV_DBG_TT, bat_priv,
2519                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2520                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2521                    full_table ? 'F' : '.', req_ttvn);
2522
2523         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2524
2525         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2526                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2527                                  tvlv_len);
2528
2529         ret = true;
2530         goto out;
2531
2532 unlock:
2533         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2534
2535 out:
2536         if (res_dst_orig_node)
2537                 batadv_orig_node_free_ref(res_dst_orig_node);
2538         if (req_dst_orig_node)
2539                 batadv_orig_node_free_ref(req_dst_orig_node);
2540         kfree(tvlv_tt_data);
2541         return ret;
2542 }
2543
2544 /**
2545  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2546  *  translation table
2547  * @bat_priv: the bat priv with all the soft interface information
2548  * @tt_data: tt data containing the tt request information
2549  * @req_src: mac address of tt request sender
2550  *
2551  * Returns true if tt request reply was sent, false otherwise.
2552  */
2553 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2554                                        struct batadv_tvlv_tt_data *tt_data,
2555                                        uint8_t *req_src)
2556 {
2557         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2558         struct batadv_hard_iface *primary_if = NULL;
2559         struct batadv_tvlv_tt_change *tt_change;
2560         struct batadv_orig_node *orig_node;
2561         uint8_t my_ttvn, req_ttvn;
2562         uint16_t tvlv_len;
2563         bool full_table;
2564         int32_t tt_len;
2565
2566         batadv_dbg(BATADV_DBG_TT, bat_priv,
2567                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2568                    req_src, tt_data->ttvn,
2569                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2570
2571         spin_lock_bh(&bat_priv->tt.commit_lock);
2572
2573         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2574         req_ttvn = tt_data->ttvn;
2575
2576         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2577         if (!orig_node)
2578                 goto out;
2579
2580         primary_if = batadv_primary_if_get_selected(bat_priv);
2581         if (!primary_if)
2582                 goto out;
2583
2584         /* If the full table has been explicitly requested or the gap
2585          * is too big send the whole local translation table
2586          */
2587         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2588             !bat_priv->tt.last_changeset)
2589                 full_table = true;
2590         else
2591                 full_table = false;
2592
2593         /* TT fragmentation hasn't been implemented yet, so send as many
2594          * TT entries fit a single packet as possible only
2595          */
2596         if (!full_table) {
2597                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2598
2599                 tt_len = bat_priv->tt.last_changeset_len;
2600                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2601                                                              &tvlv_tt_data,
2602                                                              &tt_change,
2603                                                              &tt_len);
2604                 if (!tt_len)
2605                         goto unlock;
2606
2607                 /* Copy the last orig_node's OGM buffer */
2608                 memcpy(tt_change, bat_priv->tt.last_changeset,
2609                        bat_priv->tt.last_changeset_len);
2610                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2611         } else {
2612                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2613
2614                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2615                  * in the initial part
2616                  */
2617                 tt_len = -1;
2618                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2619                                                              &tvlv_tt_data,
2620                                                              &tt_change,
2621                                                              &tt_len);
2622                 if (!tt_len)
2623                         goto out;
2624
2625                 /* fill the rest of the tvlv with the real TT entries */
2626                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2627                                         tt_change, tt_len,
2628                                         batadv_tt_local_valid, NULL);
2629         }
2630
2631         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2632         tvlv_tt_data->ttvn = req_ttvn;
2633
2634         if (full_table)
2635                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2636
2637         batadv_dbg(BATADV_DBG_TT, bat_priv,
2638                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2639                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2640
2641         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2642
2643         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2644                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2645                                  tvlv_len);
2646
2647         goto out;
2648
2649 unlock:
2650         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2651 out:
2652         spin_unlock_bh(&bat_priv->tt.commit_lock);
2653         if (orig_node)
2654                 batadv_orig_node_free_ref(orig_node);
2655         if (primary_if)
2656                 batadv_hardif_free_ref(primary_if);
2657         kfree(tvlv_tt_data);
2658         /* The packet was for this host, so it doesn't need to be re-routed */
2659         return true;
2660 }
2661
2662 /**
2663  * batadv_send_tt_response - send reply to tt request
2664  * @bat_priv: the bat priv with all the soft interface information
2665  * @tt_data: tt data containing the tt request information
2666  * @req_src: mac address of tt request sender
2667  * @req_dst: mac address of tt request recipient
2668  *
2669  * Returns true if tt request reply was sent, false otherwise.
2670  */
2671 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2672                                     struct batadv_tvlv_tt_data *tt_data,
2673                                     uint8_t *req_src, uint8_t *req_dst)
2674 {
2675         if (batadv_is_my_mac(bat_priv, req_dst))
2676                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2677         else
2678                 return batadv_send_other_tt_response(bat_priv, tt_data,
2679                                                      req_src, req_dst);
2680 }
2681
2682 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2683                                       struct batadv_orig_node *orig_node,
2684                                       struct batadv_tvlv_tt_change *tt_change,
2685                                       uint16_t tt_num_changes, uint8_t ttvn)
2686 {
2687         int i;
2688         int roams;
2689
2690         for (i = 0; i < tt_num_changes; i++) {
2691                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2692                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2693                         batadv_tt_global_del(bat_priv, orig_node,
2694                                              (tt_change + i)->addr,
2695                                              ntohs((tt_change + i)->vid),
2696                                              "tt removed by changes",
2697                                              roams);
2698                 } else {
2699                         if (!batadv_tt_global_add(bat_priv, orig_node,
2700                                                   (tt_change + i)->addr,
2701                                                   ntohs((tt_change + i)->vid),
2702                                                   (tt_change + i)->flags, ttvn))
2703                                 /* In case of problem while storing a
2704                                  * global_entry, we stop the updating
2705                                  * procedure without committing the
2706                                  * ttvn change. This will avoid to send
2707                                  * corrupted data on tt_request
2708                                  */
2709                                 return;
2710                 }
2711         }
2712         orig_node->tt_initialised = true;
2713 }
2714
2715 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2716                                   struct batadv_tvlv_tt_change *tt_change,
2717                                   uint8_t ttvn, uint8_t *resp_src,
2718                                   uint16_t num_entries)
2719 {
2720         struct batadv_orig_node *orig_node;
2721
2722         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2723         if (!orig_node)
2724                 goto out;
2725
2726         /* Purge the old table first.. */
2727         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2728                                   "Received full table");
2729
2730         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2731                                   ttvn);
2732
2733         spin_lock_bh(&orig_node->tt_buff_lock);
2734         kfree(orig_node->tt_buff);
2735         orig_node->tt_buff_len = 0;
2736         orig_node->tt_buff = NULL;
2737         spin_unlock_bh(&orig_node->tt_buff_lock);
2738
2739         atomic_set(&orig_node->last_ttvn, ttvn);
2740
2741 out:
2742         if (orig_node)
2743                 batadv_orig_node_free_ref(orig_node);
2744 }
2745
2746 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2747                                      struct batadv_orig_node *orig_node,
2748                                      uint16_t tt_num_changes, uint8_t ttvn,
2749                                      struct batadv_tvlv_tt_change *tt_change)
2750 {
2751         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2752                                   tt_num_changes, ttvn);
2753
2754         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2755                                    batadv_tt_len(tt_num_changes));
2756         atomic_set(&orig_node->last_ttvn, ttvn);
2757 }
2758
2759 /**
2760  * batadv_is_my_client - check if a client is served by the local node
2761  * @bat_priv: the bat priv with all the soft interface information
2762  * @addr: the mac adress of the client to check
2763  * @vid: VLAN identifier
2764  *
2765  * Returns true if the client is served by this node, false otherwise.
2766  */
2767 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2768                          unsigned short vid)
2769 {
2770         struct batadv_tt_local_entry *tt_local_entry;
2771         bool ret = false;
2772
2773         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2774         if (!tt_local_entry)
2775                 goto out;
2776         /* Check if the client has been logically deleted (but is kept for
2777          * consistency purpose)
2778          */
2779         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2780             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2781                 goto out;
2782         ret = true;
2783 out:
2784         if (tt_local_entry)
2785                 batadv_tt_local_entry_free_ref(tt_local_entry);
2786         return ret;
2787 }
2788
2789 /**
2790  * batadv_handle_tt_response - process incoming tt reply
2791  * @bat_priv: the bat priv with all the soft interface information
2792  * @tt_data: tt data containing the tt request information
2793  * @resp_src: mac address of tt reply sender
2794  * @num_entries: number of tt change entries appended to the tt data
2795  */
2796 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2797                                       struct batadv_tvlv_tt_data *tt_data,
2798                                       uint8_t *resp_src, uint16_t num_entries)
2799 {
2800         struct batadv_tt_req_node *node, *safe;
2801         struct batadv_orig_node *orig_node = NULL;
2802         struct batadv_tvlv_tt_change *tt_change;
2803         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2804         uint16_t change_offset;
2805
2806         batadv_dbg(BATADV_DBG_TT, bat_priv,
2807                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2808                    resp_src, tt_data->ttvn, num_entries,
2809                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2810
2811         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2812         if (!orig_node)
2813                 goto out;
2814
2815         spin_lock_bh(&orig_node->tt_lock);
2816
2817         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2818         change_offset *= ntohs(tt_data->num_vlan);
2819         change_offset += sizeof(*tt_data);
2820         tvlv_ptr += change_offset;
2821
2822         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2823         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2824                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2825                                       resp_src, num_entries);
2826         } else {
2827                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2828                                          tt_data->ttvn, tt_change);
2829         }
2830
2831         /* Recalculate the CRC for this orig_node and store it */
2832         batadv_tt_global_update_crc(bat_priv, orig_node);
2833
2834         spin_unlock_bh(&orig_node->tt_lock);
2835
2836         /* Delete the tt_req_node from pending tt_requests list */
2837         spin_lock_bh(&bat_priv->tt.req_list_lock);
2838         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2839                 if (!batadv_compare_eth(node->addr, resp_src))
2840                         continue;
2841                 list_del(&node->list);
2842                 kfree(node);
2843         }
2844
2845         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2846 out:
2847         if (orig_node)
2848                 batadv_orig_node_free_ref(orig_node);
2849 }
2850
2851 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2852 {
2853         struct batadv_tt_roam_node *node, *safe;
2854
2855         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2856
2857         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2858                 list_del(&node->list);
2859                 kfree(node);
2860         }
2861
2862         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2863 }
2864
2865 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2866 {
2867         struct batadv_tt_roam_node *node, *safe;
2868
2869         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2870         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2871                 if (!batadv_has_timed_out(node->first_time,
2872                                           BATADV_ROAMING_MAX_TIME))
2873                         continue;
2874
2875                 list_del(&node->list);
2876                 kfree(node);
2877         }
2878         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2879 }
2880
2881 /* This function checks whether the client already reached the
2882  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2883  * will not be sent.
2884  *
2885  * returns true if the ROAMING_ADV can be sent, false otherwise
2886  */
2887 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2888                                        uint8_t *client)
2889 {
2890         struct batadv_tt_roam_node *tt_roam_node;
2891         bool ret = false;
2892
2893         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2894         /* The new tt_req will be issued only if I'm not waiting for a
2895          * reply from the same orig_node yet
2896          */
2897         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2898                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2899                         continue;
2900
2901                 if (batadv_has_timed_out(tt_roam_node->first_time,
2902                                          BATADV_ROAMING_MAX_TIME))
2903                         continue;
2904
2905                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2906                         /* Sorry, you roamed too many times! */
2907                         goto unlock;
2908                 ret = true;
2909                 break;
2910         }
2911
2912         if (!ret) {
2913                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2914                 if (!tt_roam_node)
2915                         goto unlock;
2916
2917                 tt_roam_node->first_time = jiffies;
2918                 atomic_set(&tt_roam_node->counter,
2919                            BATADV_ROAMING_MAX_COUNT - 1);
2920                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2921
2922                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2923                 ret = true;
2924         }
2925
2926 unlock:
2927         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2928         return ret;
2929 }
2930
2931 /**
2932  * batadv_send_roam_adv - send a roaming advertisement message
2933  * @bat_priv: the bat priv with all the soft interface information
2934  * @client: mac address of the roaming client
2935  * @vid: VLAN identifier
2936  * @orig_node: message destination
2937  *
2938  * Send a ROAMING_ADV message to the node which was previously serving this
2939  * client. This is done to inform the node that from now on all traffic destined
2940  * for this particular roamed client has to be forwarded to the sender of the
2941  * roaming message.
2942  */
2943 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2944                                  unsigned short vid,
2945                                  struct batadv_orig_node *orig_node)
2946 {
2947         struct batadv_hard_iface *primary_if;
2948         struct batadv_tvlv_roam_adv tvlv_roam;
2949
2950         primary_if = batadv_primary_if_get_selected(bat_priv);
2951         if (!primary_if)
2952                 goto out;
2953
2954         /* before going on we have to check whether the client has
2955          * already roamed to us too many times
2956          */
2957         if (!batadv_tt_check_roam_count(bat_priv, client))
2958                 goto out;
2959
2960         batadv_dbg(BATADV_DBG_TT, bat_priv,
2961                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2962                    orig_node->orig, client, BATADV_PRINT_VID(vid));
2963
2964         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2965
2966         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
2967         tvlv_roam.vid = htons(vid);
2968
2969         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2970                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
2971                                  &tvlv_roam, sizeof(tvlv_roam));
2972
2973 out:
2974         if (primary_if)
2975                 batadv_hardif_free_ref(primary_if);
2976 }
2977
2978 static void batadv_tt_purge(struct work_struct *work)
2979 {
2980         struct delayed_work *delayed_work;
2981         struct batadv_priv_tt *priv_tt;
2982         struct batadv_priv *bat_priv;
2983
2984         delayed_work = container_of(work, struct delayed_work, work);
2985         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2986         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2987
2988         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
2989         batadv_tt_global_purge(bat_priv);
2990         batadv_tt_req_purge(bat_priv);
2991         batadv_tt_roam_purge(bat_priv);
2992
2993         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
2994                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
2995 }
2996
2997 void batadv_tt_free(struct batadv_priv *bat_priv)
2998 {
2999         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3000         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3001
3002         cancel_delayed_work_sync(&bat_priv->tt.work);
3003
3004         batadv_tt_local_table_free(bat_priv);
3005         batadv_tt_global_table_free(bat_priv);
3006         batadv_tt_req_list_free(bat_priv);
3007         batadv_tt_changes_list_free(bat_priv);
3008         batadv_tt_roam_list_free(bat_priv);
3009
3010         kfree(bat_priv->tt.last_changeset);
3011 }
3012
3013 /**
3014  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3015  *  table and possibly count them in the TT size
3016  * @bat_priv: the bat priv with all the soft interface information
3017  * @flags: the flag to switch
3018  * @enable: whether to set or unset the flag
3019  * @count: whether to increase the TT size by the number of changed entries
3020  */
3021 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3022                                       uint16_t flags, bool enable, bool count)
3023 {
3024         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3025         struct batadv_tt_common_entry *tt_common_entry;
3026         uint16_t changed_num = 0;
3027         struct hlist_head *head;
3028         uint32_t i;
3029
3030         if (!hash)
3031                 return;
3032
3033         for (i = 0; i < hash->size; i++) {
3034                 head = &hash->table[i];
3035
3036                 rcu_read_lock();
3037                 hlist_for_each_entry_rcu(tt_common_entry,
3038                                          head, hash_entry) {
3039                         if (enable) {
3040                                 if ((tt_common_entry->flags & flags) == flags)
3041                                         continue;
3042                                 tt_common_entry->flags |= flags;
3043                         } else {
3044                                 if (!(tt_common_entry->flags & flags))
3045                                         continue;
3046                                 tt_common_entry->flags &= ~flags;
3047                         }
3048                         changed_num++;
3049
3050                         if (!count)
3051                                 continue;
3052
3053                         batadv_tt_local_size_inc(bat_priv,
3054                                                  tt_common_entry->vid);
3055                 }
3056                 rcu_read_unlock();
3057         }
3058 }
3059
3060 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3061 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3062 {
3063         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3064         struct batadv_tt_common_entry *tt_common;
3065         struct batadv_tt_local_entry *tt_local;
3066         struct hlist_node *node_tmp;
3067         struct hlist_head *head;
3068         spinlock_t *list_lock; /* protects write access to the hash lists */
3069         uint32_t i;
3070
3071         if (!hash)
3072                 return;
3073
3074         for (i = 0; i < hash->size; i++) {
3075                 head = &hash->table[i];
3076                 list_lock = &hash->list_locks[i];
3077
3078                 spin_lock_bh(list_lock);
3079                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3080                                           hash_entry) {
3081                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3082                                 continue;
3083
3084                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3085                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3086                                    tt_common->addr,
3087                                    BATADV_PRINT_VID(tt_common->vid));
3088
3089                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3090                         hlist_del_rcu(&tt_common->hash_entry);
3091                         tt_local = container_of(tt_common,
3092                                                 struct batadv_tt_local_entry,
3093                                                 common);
3094                         batadv_tt_local_entry_free_ref(tt_local);
3095                 }
3096                 spin_unlock_bh(list_lock);
3097         }
3098 }
3099
3100 /**
3101  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3102  *  which have been queued in the time since the last commit
3103  * @bat_priv: the bat priv with all the soft interface information
3104  *
3105  * Caller must hold tt->commit_lock.
3106  */
3107 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3108 {
3109         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3110                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3111                         batadv_tt_tvlv_container_update(bat_priv);
3112                 return;
3113         }
3114
3115         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3116
3117         batadv_tt_local_purge_pending_clients(bat_priv);
3118         batadv_tt_local_update_crc(bat_priv);
3119
3120         /* Increment the TTVN only once per OGM interval */
3121         atomic_inc(&bat_priv->tt.vn);
3122         batadv_dbg(BATADV_DBG_TT, bat_priv,
3123                    "Local changes committed, updating to ttvn %u\n",
3124                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3125
3126         /* reset the sending counter */
3127         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3128         batadv_tt_tvlv_container_update(bat_priv);
3129 }
3130
3131 /**
3132  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3133  *  have been queued in the time since the last commit
3134  * @bat_priv: the bat priv with all the soft interface information
3135  */
3136 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3137 {
3138         spin_lock_bh(&bat_priv->tt.commit_lock);
3139         batadv_tt_local_commit_changes_nolock(bat_priv);
3140         spin_unlock_bh(&bat_priv->tt.commit_lock);
3141 }
3142
3143 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3144                            uint8_t *dst, unsigned short vid)
3145 {
3146         struct batadv_tt_local_entry *tt_local_entry = NULL;
3147         struct batadv_tt_global_entry *tt_global_entry = NULL;
3148         struct batadv_softif_vlan *vlan;
3149         bool ret = false;
3150
3151         vlan = batadv_softif_vlan_get(bat_priv, vid);
3152         if (!vlan || !atomic_read(&vlan->ap_isolation))
3153                 goto out;
3154
3155         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3156         if (!tt_local_entry)
3157                 goto out;
3158
3159         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3160         if (!tt_global_entry)
3161                 goto out;
3162
3163         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3164                 goto out;
3165
3166         ret = true;
3167
3168 out:
3169         if (vlan)
3170                 batadv_softif_vlan_free_ref(vlan);
3171         if (tt_global_entry)
3172                 batadv_tt_global_entry_free_ref(tt_global_entry);
3173         if (tt_local_entry)
3174                 batadv_tt_local_entry_free_ref(tt_local_entry);
3175         return ret;
3176 }
3177
3178 /**
3179  * batadv_tt_update_orig - update global translation table with new tt
3180  *  information received via ogms
3181  * @bat_priv: the bat priv with all the soft interface information
3182  * @orig: the orig_node of the ogm
3183  * @tt_vlan: pointer to the first tvlv VLAN entry
3184  * @tt_num_vlan: number of tvlv VLAN entries
3185  * @tt_change: pointer to the first entry in the TT buffer
3186  * @tt_num_changes: number of tt changes inside the tt buffer
3187  * @ttvn: translation table version number of this changeset
3188  * @tt_crc: crc32 checksum of orig node's translation table
3189  */
3190 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3191                                   struct batadv_orig_node *orig_node,
3192                                   const void *tt_buff, uint16_t tt_num_vlan,
3193                                   struct batadv_tvlv_tt_change *tt_change,
3194                                   uint16_t tt_num_changes, uint8_t ttvn)
3195 {
3196         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3197         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3198         bool full_table = true;
3199
3200         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3201         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3202          * increased by one -> we can apply the attached changes
3203          */
3204         if ((!orig_node->tt_initialised && ttvn == 1) ||
3205             ttvn - orig_ttvn == 1) {
3206                 /* the OGM could not contain the changes due to their size or
3207                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3208                  * times.
3209                  * In this case send a tt request
3210                  */
3211                 if (!tt_num_changes) {
3212                         full_table = false;
3213                         goto request_table;
3214                 }
3215
3216                 spin_lock_bh(&orig_node->tt_lock);
3217
3218                 tt_change = (struct batadv_tvlv_tt_change *)tt_buff;
3219                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3220                                          ttvn, tt_change);
3221
3222                 /* Even if we received the precomputed crc with the OGM, we
3223                  * prefer to recompute it to spot any possible inconsistency
3224                  * in the global table
3225                  */
3226                 batadv_tt_global_update_crc(bat_priv, orig_node);
3227
3228                 spin_unlock_bh(&orig_node->tt_lock);
3229
3230                 /* The ttvn alone is not enough to guarantee consistency
3231                  * because a single value could represent different states
3232                  * (due to the wrap around). Thus a node has to check whether
3233                  * the resulting table (after applying the changes) is still
3234                  * consistent or not. E.g. a node could disconnect while its
3235                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3236                  * checking the CRC value is mandatory to detect the
3237                  * inconsistency
3238                  */
3239                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3240                                                 tt_num_vlan))
3241                         goto request_table;
3242         } else {
3243                 /* if we missed more than one change or our tables are not
3244                  * in sync anymore -> request fresh tt data
3245                  */
3246                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
3247                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3248                                                 tt_num_vlan)) {
3249 request_table:
3250                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3251                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3252                                    orig_node->orig, ttvn, orig_ttvn,
3253                                    tt_num_changes);
3254                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3255                                                tt_vlan, tt_num_vlan,
3256                                                full_table);
3257                         return;
3258                 }
3259         }
3260 }
3261
3262 /**
3263  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3264  * @bat_priv: the bat priv with all the soft interface information
3265  * @addr: the mac address of the client to check
3266  * @vid: VLAN identifier
3267  *
3268  * Returns true if we know that the client has moved from its old originator
3269  * to another one. This entry is still kept for consistency purposes and will be
3270  * deleted later by a DEL or because of timeout
3271  */
3272 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3273                                         uint8_t *addr, unsigned short vid)
3274 {
3275         struct batadv_tt_global_entry *tt_global_entry;
3276         bool ret = false;
3277
3278         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3279         if (!tt_global_entry)
3280                 goto out;
3281
3282         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3283         batadv_tt_global_entry_free_ref(tt_global_entry);
3284 out:
3285         return ret;
3286 }
3287
3288 /**
3289  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3290  * @bat_priv: the bat priv with all the soft interface information
3291  * @addr: the mac address of the local client to query
3292  * @vid: VLAN identifier
3293  *
3294  * Returns true if the local client is known to be roaming (it is not served by
3295  * this node anymore) or not. If yes, the client is still present in the table
3296  * to keep the latter consistent with the node TTVN
3297  */
3298 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3299                                        uint8_t *addr, unsigned short vid)
3300 {
3301         struct batadv_tt_local_entry *tt_local_entry;
3302         bool ret = false;
3303
3304         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3305         if (!tt_local_entry)
3306                 goto out;
3307
3308         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3309         batadv_tt_local_entry_free_ref(tt_local_entry);
3310 out:
3311         return ret;
3312 }
3313
3314 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3315                                           struct batadv_orig_node *orig_node,
3316                                           const unsigned char *addr,
3317                                           unsigned short vid)
3318 {
3319         bool ret = false;
3320
3321         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3322                                   BATADV_TT_CLIENT_TEMP,
3323                                   atomic_read(&orig_node->last_ttvn)))
3324                 goto out;
3325
3326         batadv_dbg(BATADV_DBG_TT, bat_priv,
3327                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3328                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3329         ret = true;
3330 out:
3331         return ret;
3332 }
3333
3334 /**
3335  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3336  *  maximum packet size that can be transported through the mesh
3337  * @soft_iface: netdev struct of the mesh interface
3338  *
3339  * Remove entries older than 'timeout' and half timeout if more entries need
3340  * to be removed.
3341  */
3342 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3343 {
3344         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3345         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3346         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3347         bool reduced = false;
3348
3349         spin_lock_bh(&bat_priv->tt.commit_lock);
3350
3351         while (true) {
3352                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3353                 if (packet_size_max >= table_size)
3354                         break;
3355
3356                 batadv_tt_local_purge(bat_priv, timeout);
3357                 batadv_tt_local_purge_pending_clients(bat_priv);
3358
3359                 timeout /= 2;
3360                 reduced = true;
3361                 net_ratelimited_function(batadv_info, soft_iface,
3362                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3363                                          packet_size_max);
3364         }
3365
3366         /* commit these changes immediately, to avoid synchronization problem
3367          * with the TTVN
3368          */
3369         if (reduced)
3370                 batadv_tt_local_commit_changes_nolock(bat_priv);
3371
3372         spin_unlock_bh(&bat_priv->tt.commit_lock);
3373 }
3374
3375 /**
3376  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3377  * @bat_priv: the bat priv with all the soft interface information
3378  * @orig: the orig_node of the ogm
3379  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3380  * @tvlv_value: tvlv buffer containing the gateway data
3381  * @tvlv_value_len: tvlv buffer length
3382  */
3383 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3384                                           struct batadv_orig_node *orig,
3385                                           uint8_t flags, void *tvlv_value,
3386                                           uint16_t tvlv_value_len)
3387 {
3388         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3389         struct batadv_tvlv_tt_change *tt_change;
3390         struct batadv_tvlv_tt_data *tt_data;
3391         uint16_t num_entries, num_vlan;
3392
3393         if (tvlv_value_len < sizeof(*tt_data))
3394                 return;
3395
3396         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3397         tvlv_value_len -= sizeof(*tt_data);
3398
3399         num_vlan = ntohs(tt_data->num_vlan);
3400
3401         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3402                 return;
3403
3404         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3405         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3406         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3407
3408         num_entries = batadv_tt_entries(tvlv_value_len);
3409
3410         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3411                               num_entries, tt_data->ttvn);
3412 }
3413
3414 /**
3415  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3416  *  container
3417  * @bat_priv: the bat priv with all the soft interface information
3418  * @src: mac address of tt tvlv sender
3419  * @dst: mac address of tt tvlv recipient
3420  * @tvlv_value: tvlv buffer containing the tt data
3421  * @tvlv_value_len: tvlv buffer length
3422  *
3423  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3424  * otherwise.
3425  */
3426 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3427                                              uint8_t *src, uint8_t *dst,
3428                                              void *tvlv_value,
3429                                              uint16_t tvlv_value_len)
3430 {
3431         struct batadv_tvlv_tt_data *tt_data;
3432         uint16_t tt_vlan_len, tt_num_entries;
3433         char tt_flag;
3434         bool ret;
3435
3436         if (tvlv_value_len < sizeof(*tt_data))
3437                 return NET_RX_SUCCESS;
3438
3439         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3440         tvlv_value_len -= sizeof(*tt_data);
3441
3442         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3443         tt_vlan_len *= ntohs(tt_data->num_vlan);
3444
3445         if (tvlv_value_len < tt_vlan_len)
3446                 return NET_RX_SUCCESS;
3447
3448         tvlv_value_len -= tt_vlan_len;
3449         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3450
3451         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3452         case BATADV_TT_REQUEST:
3453                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3454
3455                 /* If this node cannot provide a TT response the tt_request is
3456                  * forwarded
3457                  */
3458                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3459                 if (!ret) {
3460                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3461                                 tt_flag = 'F';
3462                         else
3463                                 tt_flag = '.';
3464
3465                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3466                                    "Routing TT_REQUEST to %pM [%c]\n",
3467                                    dst, tt_flag);
3468                         /* tvlv API will re-route the packet */
3469                         return NET_RX_DROP;
3470                 }
3471                 break;
3472         case BATADV_TT_RESPONSE:
3473                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3474
3475                 if (batadv_is_my_mac(bat_priv, dst)) {
3476                         batadv_handle_tt_response(bat_priv, tt_data,
3477                                                   src, tt_num_entries);
3478                         return NET_RX_SUCCESS;
3479                 }
3480
3481                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3482                         tt_flag =  'F';
3483                 else
3484                         tt_flag = '.';
3485
3486                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3487                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3488
3489                 /* tvlv API will re-route the packet */
3490                 return NET_RX_DROP;
3491         }
3492
3493         return NET_RX_SUCCESS;
3494 }
3495
3496 /**
3497  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3498  * @bat_priv: the bat priv with all the soft interface information
3499  * @src: mac address of tt tvlv sender
3500  * @dst: mac address of tt tvlv recipient
3501  * @tvlv_value: tvlv buffer containing the tt data
3502  * @tvlv_value_len: tvlv buffer length
3503  *
3504  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3505  * otherwise.
3506  */
3507 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3508                                                uint8_t *src, uint8_t *dst,
3509                                                void *tvlv_value,
3510                                                uint16_t tvlv_value_len)
3511 {
3512         struct batadv_tvlv_roam_adv *roaming_adv;
3513         struct batadv_orig_node *orig_node = NULL;
3514
3515         /* If this node is not the intended recipient of the
3516          * roaming advertisement the packet is forwarded
3517          * (the tvlv API will re-route the packet).
3518          */
3519         if (!batadv_is_my_mac(bat_priv, dst))
3520                 return NET_RX_DROP;
3521
3522         if (tvlv_value_len < sizeof(*roaming_adv))
3523                 goto out;
3524
3525         orig_node = batadv_orig_hash_find(bat_priv, src);
3526         if (!orig_node)
3527                 goto out;
3528
3529         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3530         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3531
3532         batadv_dbg(BATADV_DBG_TT, bat_priv,
3533                    "Received ROAMING_ADV from %pM (client %pM)\n",
3534                    src, roaming_adv->client);
3535
3536         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3537                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3538                              atomic_read(&orig_node->last_ttvn) + 1);
3539
3540 out:
3541         if (orig_node)
3542                 batadv_orig_node_free_ref(orig_node);
3543         return NET_RX_SUCCESS;
3544 }
3545
3546 /**
3547  * batadv_tt_init - initialise the translation table internals
3548  * @bat_priv: the bat priv with all the soft interface information
3549  *
3550  * Return 0 on success or negative error number in case of failure.
3551  */
3552 int batadv_tt_init(struct batadv_priv *bat_priv)
3553 {
3554         int ret;
3555
3556         /* synchronized flags must be remote */
3557         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3558
3559         ret = batadv_tt_local_init(bat_priv);
3560         if (ret < 0)
3561                 return ret;
3562
3563         ret = batadv_tt_global_init(bat_priv);
3564         if (ret < 0)
3565                 return ret;
3566
3567         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3568                                      batadv_tt_tvlv_unicast_handler_v1,
3569                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3570
3571         batadv_tvlv_handler_register(bat_priv, NULL,
3572                                      batadv_roam_tvlv_unicast_handler_v1,
3573                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3574
3575         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3576         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3577                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3578
3579         return 1;
3580 }
3581
3582 /**
3583  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3584  * @bat_priv: the bat priv with all the soft interface information
3585  * @addr: the mac address of the client
3586  * @vid: the identifier of the VLAN where this client is connected
3587  *
3588  * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3589  * otherwise
3590  */
3591 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3592                                   const uint8_t *addr, unsigned short vid)
3593 {
3594         struct batadv_tt_global_entry *tt;
3595         bool ret;
3596
3597         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3598         if (!tt)
3599                 return false;
3600
3601         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3602
3603         batadv_tt_global_entry_free_ref(tt);
3604
3605         return ret;
3606 }