Pileus Git - ~andy/linux/blob - net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include "main.h"
  21 #include "translation-table.h"
  22 #include "soft-interface.h"
  23 #include "hard-interface.h"
  24 #include "send.h"
  25 #include "hash.h"
  26 #include "originator.h"
  27 #include "routing.h"
  28 #include "bridge_loop_avoidance.h"
  29
  30 #include <linux/crc32c.h>
  31
  32 /* hash class keys */
  33 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  34 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  35
  36 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
  37                                  unsigned short vid,
  38                                  struct batadv_orig_node *orig_node);
  39 static void batadv_tt_purge(struct work_struct *work);
  40 static void
  41 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  42 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  43                                  struct batadv_orig_node *orig_node,
  44                                  const unsigned char *addr,
  45                                  unsigned short vid, const char *message,
  46                                  bool roaming);
  47
  48 /* returns 1 if they are the same mac addr */
  49 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  50 {
  51         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  52                                          hash_entry);
  53
  54         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
  55 }
  56
  57 /**
  58  * batadv_choose_tt - return the index of the tt entry in the hash table
  59  * @data: pointer to the tt_common_entry object to map
  60  * @size: the size of the hash table
  61  *
  62  * Returns the hash index where the object represented by 'data' should be
  63  * stored at.
  64  */
  65 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
  66 {
  67         struct batadv_tt_common_entry *tt;
  68         uint32_t hash = 0;
  69
  70         tt = (struct batadv_tt_common_entry *)data;
  71         hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
  72         hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
  73
  74         hash += (hash << 3);
  75         hash ^= (hash >> 11);
  76         hash += (hash << 15);
  77
  78         return hash % size;
  79 }
  80
  81 /**
  82  * batadv_tt_hash_find - look for a client in the given hash table
  83  * @hash: the hash table to search
  84  * @addr: the mac address of the client to look for
  85  * @vid: VLAN identifier
  86  *
  87  * Returns a pointer to the tt_common struct belonging to the searched client if
  88  * found, NULL otherwise.
  89  */
  90 static struct batadv_tt_common_entry *
  91 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
  92                     unsigned short vid)
  93 {
  94         struct hlist_head *head;
  95         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
  96         uint32_t index;
  97
  98         if (!hash)
  99                 return NULL;
 100
 101         memcpy(to_search.addr, addr, ETH_ALEN);
 102         to_search.vid = vid;
 103
 104         index = batadv_choose_tt(&to_search, hash->size);
 105         head = &hash->table[index];
 106
 107         rcu_read_lock();
 108         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 109                 if (!batadv_compare_eth(tt, addr))
 110                         continue;
 111
 112                 if (tt->vid != vid)
 113                         continue;
 114
 115                 if (!atomic_inc_not_zero(&tt->refcount))
 116                         continue;
 117
 118                 tt_tmp = tt;
 119                 break;
 120         }
 121         rcu_read_unlock();
 122
 123         return tt_tmp;
 124 }
 125
 126 /**
 127  * batadv_tt_local_hash_find - search the local table for a given client
 128  * @bat_priv: the bat priv with all the soft interface information
 129  * @addr: the mac address of the client to look for
 130  * @vid: VLAN identifier
 131  *
 132  * Returns a pointer to the corresponding tt_local_entry struct if the client is
 133  * found, NULL otherwise.
 134  */
 135 static struct batadv_tt_local_entry *
 136 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 137                           unsigned short vid)
 138 {
 139         struct batadv_tt_common_entry *tt_common_entry;
 140         struct batadv_tt_local_entry *tt_local_entry = NULL;
 141
 142         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 143                                               vid);
 144         if (tt_common_entry)
 145                 tt_local_entry = container_of(tt_common_entry,
 146                                               struct batadv_tt_local_entry,
 147                                               common);
 148         return tt_local_entry;
 149 }
 150
 151 /**
 152  * batadv_tt_global_hash_find - search the global table for a given client
 153  * @bat_priv: the bat priv with all the soft interface information
 154  * @addr: the mac address of the client to look for
 155  * @vid: VLAN identifier
 156  *
 157  * Returns a pointer to the corresponding tt_global_entry struct if the client
 158  * is found, NULL otherwise.
 159  */
 160 static struct batadv_tt_global_entry *
 161 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 162                            unsigned short vid)
 163 {
 164         struct batadv_tt_common_entry *tt_common_entry;
 165         struct batadv_tt_global_entry *tt_global_entry = NULL;
 166
 167         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 168                                               vid);
 169         if (tt_common_entry)
 170                 tt_global_entry = container_of(tt_common_entry,
 171                                                struct batadv_tt_global_entry,
 172                                                common);
 173         return tt_global_entry;
 174 }
 175
 176 static void
 177 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 178 {
 179         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 180                 kfree_rcu(tt_local_entry, common.rcu);
 181 }
 182
 183 /**
 184  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
 185  *  tt_global_entry and possibly free it
 186  * @tt_global_entry: the object to free
 187  */
 188 static void
 189 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 190 {
 191         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 192                 batadv_tt_global_del_orig_list(tt_global_entry);
 193                 kfree_rcu(tt_global_entry, common.rcu);
 194         }
 195 }
 196
 197 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 198 {
 199         struct batadv_tt_orig_list_entry *orig_entry;
 200
 201         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 202
 203         /* We are in an rcu callback here, therefore we cannot use
 204          * batadv_orig_node_free_ref() and its call_rcu():
 205          * An rcu_barrier() wouldn't wait for that to finish
 206          */
 207         batadv_orig_node_free_ref_now(orig_entry->orig_node);
 208         kfree(orig_entry);
 209 }
 210
 211 /**
 212  * batadv_tt_local_size_mod - change the size by v of the local table identified
 213  *  by vid
 214  * @bat_priv: the bat priv with all the soft interface information
 215  * @vid: the VLAN identifier of the sub-table to change
 216  * @v: the amount to sum to the local table size
 217  */
 218 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 219                                      unsigned short vid, int v)
 220 {
 221         struct batadv_softif_vlan *vlan;
 222
 223         vlan = batadv_softif_vlan_get(bat_priv, vid);
 224         if (!vlan)
 225                 return;
 226
 227         atomic_add(v, &vlan->tt.num_entries);
 228
 229         batadv_softif_vlan_free_ref(vlan);
 230 }
 231
 232 /**
 233  * batadv_tt_local_size_inc - increase by one the local table size for the given
 234  *  vid
 235  * @bat_priv: the bat priv with all the soft interface information
 236  * @vid: the VLAN identifier
 237  */
 238 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 239                                      unsigned short vid)
 240 {
 241         batadv_tt_local_size_mod(bat_priv, vid, 1);
 242 }
 243
 244 /**
 245  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 246  *  vid
 247  * @bat_priv: the bat priv with all the soft interface information
 248  * @vid: the VLAN identifier
 249  */
 250 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 251                                      unsigned short vid)
 252 {
 253         batadv_tt_local_size_mod(bat_priv, vid, -1);
 254 }
 255
 256 /**
 257  * batadv_tt_global_size_mod - change the size by v of the local table
 258  *  identified by vid
 259  * @bat_priv: the bat priv with all the soft interface information
 260  * @vid: the VLAN identifier
 261  * @v: the amount to sum to the global table size
 262  */
 263 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 264                                       unsigned short vid, int v)
 265 {
 266         struct batadv_orig_node_vlan *vlan;
 267
 268         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 269         if (!vlan)
 270                 return;
 271
 272         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 273                 spin_lock_bh(&orig_node->vlan_list_lock);
 274                 list_del_rcu(&vlan->list);
 275                 spin_unlock_bh(&orig_node->vlan_list_lock);
 276                 batadv_orig_node_vlan_free_ref(vlan);
 277         }
 278
 279         batadv_orig_node_vlan_free_ref(vlan);
 280 }
 281
 282 /**
 283  * batadv_tt_global_size_inc - increase by one the global table size for the
 284  *  given vid
 285  * @orig_node: the originator which global table size has to be decreased
 286  * @vid: the vlan identifier
 287  */
 288 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 289                                       unsigned short vid)
 290 {
 291         batadv_tt_global_size_mod(orig_node, vid, 1);
 292 }
 293
 294 /**
 295  * batadv_tt_global_size_dec - decrease by one the global table size for the
 296  *  given vid
 297  * @orig_node: the originator which global table size has to be decreased
 298  * @vid: the vlan identifier
 299  */
 300 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 301                                       unsigned short vid)
 302 {
 303         batadv_tt_global_size_mod(orig_node, vid, -1);
 304 }
 305
 306 static void
 307 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 308 {
 309         if (!atomic_dec_and_test(&orig_entry->refcount))
 310                 return;
 311
 312         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 313 }
 314
 315 /**
 316  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 317  * @bat_priv: the bat priv with all the soft interface information
 318  * @tt_local_entry: the TT entry involved in the event
 319  * @event_flags: flags to store in the event structure
 320  */
 321 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 322                                   struct batadv_tt_local_entry *tt_local_entry,
 323                                   uint8_t event_flags)
 324 {
 325         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 326         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 327         uint8_t flags = common->flags | event_flags;
 328         bool event_removed = false;
 329         bool del_op_requested, del_op_entry;
 330
 331         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 332         if (!tt_change_node)
 333                 return;
 334
 335         tt_change_node->change.flags = flags;
 336         memset(tt_change_node->change.reserved, 0,
 337                sizeof(tt_change_node->change.reserved));
 338         memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
 339         tt_change_node->change.vid = htons(common->vid);
 340
 341         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 342
 343         /* check for ADD+DEL or DEL+ADD events */
 344         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 345         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 346                                  list) {
 347                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 348                         continue;
 349
 350                 /* DEL+ADD in the same orig interval have no effect and can be
 351                  * removed to avoid silly behaviour on the receiver side. The
 352                  * other way around (ADD+DEL) can happen in case of roaming of
 353                  * a client still in the NEW state. Roaming of NEW clients is
 354                  * now possible due to automatically recognition of "temporary"
 355                  * clients
 356                  */
 357                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 358                 if (!del_op_requested && del_op_entry)
 359                         goto del;
 360                 if (del_op_requested && !del_op_entry)
 361                         goto del;
 362
 363                 /* this is a second add in the same originator interval. It
 364                  * means that flags have been changed: update them!
 365                  */
 366                 if (!del_op_requested && !del_op_entry)
 367                         entry->change.flags = flags;
 368
 369                 continue;
 370 del:
 371                 list_del(&entry->list);
 372                 kfree(entry);
 373                 kfree(tt_change_node);
 374                 event_removed = true;
 375                 goto unlock;
 376         }
 377
 378         /* track the change in the OGMinterval list */
 379         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 380
 381 unlock:
 382         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 383
 384         if (event_removed)
 385                 atomic_dec(&bat_priv->tt.local_changes);
 386         else
 387                 atomic_inc(&bat_priv->tt.local_changes);
 388 }
 389
 390 /**
 391  * batadv_tt_len - compute length in bytes of given number of tt changes
 392  * @changes_num: number of tt changes
 393  *
 394  * Returns computed length in bytes.
 395  */
 396 static int batadv_tt_len(int changes_num)
 397 {
 398         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 399 }
 400
 401 /**
 402  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 403  * @tt_len: available space
 404  *
 405  * Returns the number of entries.
 406  */
 407 static uint16_t batadv_tt_entries(uint16_t tt_len)
 408 {
 409         return tt_len / batadv_tt_len(1);
 410 }
 411
 412 /**
 413  * batadv_tt_local_table_transmit_size - calculates the local translation table
 414  *  size when transmitted over the air
 415  * @bat_priv: the bat priv with all the soft interface information
 416  *
 417  * Returns local translation table size in bytes.
 418  */
 419 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 420 {
 421         uint16_t num_vlan = 0, tt_local_entries = 0;
 422         struct batadv_softif_vlan *vlan;
 423         int hdr_size;
 424
 425         rcu_read_lock();
 426         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 427                 num_vlan++;
 428                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 429         }
 430         rcu_read_unlock();
 431
 432         /* header size of tvlv encapsulated tt response payload */
 433         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 434         hdr_size += sizeof(struct batadv_tvlv_hdr);
 435         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 436         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 437
 438         return hdr_size + batadv_tt_len(tt_local_entries);
 439 }
 440
 441 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 442 {
 443         if (bat_priv->tt.local_hash)
 444                 return 0;
 445
 446         bat_priv->tt.local_hash = batadv_hash_new(1024);
 447
 448         if (!bat_priv->tt.local_hash)
 449                 return -ENOMEM;
 450
 451         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 452                                    &batadv_tt_local_hash_lock_class_key);
 453
 454         return 0;
 455 }
 456
 457 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 458                                   struct batadv_tt_global_entry *tt_global,
 459                                   const char *message)
 460 {
 461         batadv_dbg(BATADV_DBG_TT, bat_priv,
 462                    "Deleting global tt entry %pM (vid: %d): %s\n",
 463                    tt_global->common.addr,
 464                    BATADV_PRINT_VID(tt_global->common.vid), message);
 465
 466         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 467                            batadv_choose_tt, &tt_global->common);
 468         batadv_tt_global_entry_free_ref(tt_global);
 469 }
 470
 471 /**
 472  * batadv_tt_local_add - add a new client to the local table or update an
 473  *  existing client
 474  * @soft_iface: netdev struct of the mesh interface
 475  * @addr: the mac address of the client to add
 476  * @vid: VLAN identifier
 477  * @ifindex: index of the interface where the client is connected to (useful to
 478  *  identify wireless clients)
 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)
 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
 495         if (ifindex != BATADV_NULL_IFINDEX)
 496                 in_dev = dev_get_by_index(&init_net, ifindex);
 497
 498         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 499         tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 500
 501         if (tt_local) {
 502                 tt_local->last_seen = jiffies;
 503                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 504                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 505                                    "Re-adding pending client %pM (vid: %d)\n",
 506                                    addr, BATADV_PRINT_VID(vid));
 507                         /* whatever the reason why the PENDING flag was set,
 508                          * this is a client which was enqueued to be removed in
 509                          * this orig_interval. Since it popped up again, the
 510                          * flag can be reset like it was never enqueued
 511                          */
 512                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 513                         goto add_event;
 514                 }
 515
 516                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 517                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 518                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 519                                    addr, BATADV_PRINT_VID(vid));
 520                         /* the ROAM flag is set because this client roamed away
 521                          * and the node got a roaming_advertisement message. Now
 522                          * that the client popped up again at its original
 523                          * location such flag can be unset
 524                          */
 525                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 526                         roamed_back = true;
 527                 }
 528                 goto check_roaming;
 529         }
 530
 531         /* Ignore the client if we cannot send it in a full table response. */
 532         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 533         table_size += batadv_tt_len(1);
 534         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 535         if (table_size > packet_size_max) {
 536                 net_ratelimited_function(batadv_info, soft_iface,
 537                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 538                                          table_size, packet_size_max, addr);
 539                 goto out;
 540         }
 541
 542         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
 543         if (!tt_local)
 544                 goto out;
 545
 546         batadv_dbg(BATADV_DBG_TT, bat_priv,
 547                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 548                    addr, BATADV_PRINT_VID(vid),
 549                    (uint8_t)atomic_read(&bat_priv->tt.vn));
 550
 551         memcpy(tt_local->common.addr, addr, ETH_ALEN);
 552         /* The local entry has to be marked as NEW to avoid to send it in
 553          * a full table response going out before the next ttvn increment
 554          * (consistency check)
 555          */
 556         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 557         tt_local->common.vid = vid;
 558         if (batadv_is_wifi_netdev(in_dev))
 559                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 560         atomic_set(&tt_local->common.refcount, 2);
 561         tt_local->last_seen = jiffies;
 562         tt_local->common.added_at = tt_local->last_seen;
 563
 564         /* the batman interface mac address should never be purged */
 565         if (batadv_compare_eth(addr, soft_iface->dev_addr))
 566                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 567
 568         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 569                                      batadv_choose_tt, &tt_local->common,
 570                                      &tt_local->common.hash_entry);
 571
 572         if (unlikely(hash_added != 0)) {
 573                 /* remove the reference for the hash */
 574                 batadv_tt_local_entry_free_ref(tt_local);
 575                 goto out;
 576         }
 577
 578 add_event:
 579         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 580
 581 check_roaming:
 582         /* Check whether it is a roaming, but don't do anything if the roaming
 583          * process has already been handled
 584          */
 585         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 586                 /* These node are probably going to update their tt table */
 587                 head = &tt_global->orig_list;
 588                 rcu_read_lock();
 589                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 590                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 591                                              tt_global->common.vid,
 592                                              orig_entry->orig_node);
 593                 }
 594                 rcu_read_unlock();
 595                 if (roamed_back) {
 596                         batadv_tt_global_free(bat_priv, tt_global,
 597                                               "Roaming canceled");
 598                         tt_global = NULL;
 599                 } else {
 600                         /* The global entry has to be marked as ROAMING and
 601                          * has to be kept for consistency purpose
 602                          */
 603                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 604                         tt_global->roam_at = jiffies;
 605                 }
 606         }
 607
 608         /* store the current remote flags before altering them. This helps
 609          * understanding is flags are changing or not
 610          */
 611         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 612
 613         if (batadv_is_wifi_netdev(in_dev))
 614                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 615         else
 616                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 617
 618         /* if any "dynamic" flag has been modified, resend an ADD event for this
 619          * entry so that all the nodes can get the new flags
 620          */
 621         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 622                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 623
 624         ret = true;
 625 out:
 626         if (in_dev)
 627                 dev_put(in_dev);
 628         if (tt_local)
 629                 batadv_tt_local_entry_free_ref(tt_local);
 630         if (tt_global)
 631                 batadv_tt_global_entry_free_ref(tt_global);
 632         return ret;
 633 }
 634
 635 /**
 636  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 637  *  within a TT Response directed to another node
 638  * @orig_node: originator for which the TT data has to be prepared
 639  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 640  * @tt_change: uninitialised pointer to the address of the area where the TT
 641  *  changed can be stored
 642  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 643  *  function reserves the amount of space needed to send the entire global TT
 644  *  table. In case of success the value is updated with the real amount of
 645  *  reserved bytes
 646
 647  * Allocate the needed amount of memory for the entire TT TVLV and write its
 648  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 649  * objects, one per active VLAN served by the originator node.
 650  *
 651  * Return the size of the allocated buffer or 0 in case of failure.
 652  */
 653 static uint16_t
 654 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 655                                    struct batadv_tvlv_tt_data **tt_data,
 656                                    struct batadv_tvlv_tt_change **tt_change,
 657                                    int32_t *tt_len)
 658 {
 659         uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
 660         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 661         struct batadv_orig_node_vlan *vlan;
 662         uint8_t *tt_change_ptr;
 663
 664         rcu_read_lock();
 665         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 666                 num_vlan++;
 667                 num_entries += atomic_read(&vlan->tt.num_entries);
 668         }
 669
 670         change_offset = sizeof(**tt_data);
 671         change_offset += num_vlan * sizeof(*tt_vlan);
 672
 673         /* if tt_len is negative, allocate the space needed by the full table */
 674         if (*tt_len < 0)
 675                 *tt_len = batadv_tt_len(num_entries);
 676
 677         tvlv_len = *tt_len;
 678         tvlv_len += change_offset;
 679
 680         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 681         if (!*tt_data) {
 682                 *tt_len = 0;
 683                 goto out;
 684         }
 685
 686         (*tt_data)->flags = BATADV_NO_FLAGS;
 687         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 688         (*tt_data)->num_vlan = htons(num_vlan);
 689
 690         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 691         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 692                 tt_vlan->vid = htons(vlan->vid);
 693                 tt_vlan->crc = htonl(vlan->tt.crc);
 694
 695                 tt_vlan++;
 696         }
 697
 698         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 699         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 700
 701 out:
 702         rcu_read_unlock();
 703         return tvlv_len;
 704 }
 705
 706 /**
 707  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 708  *  node
 709  * @bat_priv: the bat priv with all the soft interface information
 710  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 711  * @tt_change: uninitialised pointer to the address of the area where the TT
 712  *  changes can be stored
 713  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 714  *  function reserves the amount of space needed to send the entire local TT
 715  *  table. In case of success the value is updated with the real amount of
 716  *  reserved bytes
 717  *
 718  * Allocate the needed amount of memory for the entire TT TVLV and write its
 719  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 720  * objects, one per active VLAN.
 721  *
 722  * Return the size of the allocated buffer or 0 in case of failure.
 723  */
 724 static uint16_t
 725 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 726                                   struct batadv_tvlv_tt_data **tt_data,
 727                                   struct batadv_tvlv_tt_change **tt_change,
 728                                   int32_t *tt_len)
 729 {
 730         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 731         struct batadv_softif_vlan *vlan;
 732         uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
 733         uint8_t *tt_change_ptr;
 734         int change_offset;
 735
 736         rcu_read_lock();
 737         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 738                 num_vlan++;
 739                 num_entries += atomic_read(&vlan->tt.num_entries);
 740         }
 741
 742         change_offset = sizeof(**tt_data);
 743         change_offset += num_vlan * sizeof(*tt_vlan);
 744
 745         /* if tt_len is negative, allocate the space needed by the full table */
 746         if (*tt_len < 0)
 747                 *tt_len = batadv_tt_len(num_entries);
 748
 749         tvlv_len = *tt_len;
 750         tvlv_len += change_offset;
 751
 752         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 753         if (!*tt_data) {
 754                 tvlv_len = 0;
 755                 goto out;
 756         }
 757
 758         (*tt_data)->flags = BATADV_NO_FLAGS;
 759         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 760         (*tt_data)->num_vlan = htons(num_vlan);
 761
 762         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 763         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 764                 tt_vlan->vid = htons(vlan->vid);
 765                 tt_vlan->crc = htonl(vlan->tt.crc);
 766
 767                 tt_vlan++;
 768         }
 769
 770         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 771         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 772
 773 out:
 774         rcu_read_unlock();
 775         return tvlv_len;
 776 }
 777
 778 /**
 779  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 780  *  after local tt changes have been committed
 781  * @bat_priv: the bat priv with all the soft interface information
 782  */
 783 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 784 {
 785         struct batadv_tt_change_node *entry, *safe;
 786         struct batadv_tvlv_tt_data *tt_data;
 787         struct batadv_tvlv_tt_change *tt_change;
 788         int tt_diff_len, tt_change_len = 0;
 789         int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
 790         uint16_t tvlv_len;
 791
 792         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 793         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 794
 795         /* if we have too many changes for one packet don't send any
 796          * and wait for the tt table request which will be fragmented
 797          */
 798         if (tt_diff_len > bat_priv->soft_iface->mtu)
 799                 tt_diff_len = 0;
 800
 801         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 802                                                      &tt_change, &tt_diff_len);
 803         if (!tvlv_len)
 804                 return;
 805
 806         tt_data->flags = BATADV_TT_OGM_DIFF;
 807
 808         if (tt_diff_len == 0)
 809                 goto container_register;
 810
 811         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 812         atomic_set(&bat_priv->tt.local_changes, 0);
 813
 814         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 815                                  list) {
 816                 if (tt_diff_entries_count < tt_diff_entries_num) {
 817                         memcpy(tt_change + tt_diff_entries_count,
 818                                &entry->change,
 819                                sizeof(struct batadv_tvlv_tt_change));
 820                         tt_diff_entries_count++;
 821                 }
 822                 list_del(&entry->list);
 823                 kfree(entry);
 824         }
 825         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 826
 827         /* Keep the buffer for possible tt_request */
 828         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 829         kfree(bat_priv->tt.last_changeset);
 830         bat_priv->tt.last_changeset_len = 0;
 831         bat_priv->tt.last_changeset = NULL;
 832         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 833         /* check whether this new OGM has no changes due to size problems */
 834         if (tt_diff_entries_count > 0) {
 835                 /* if kmalloc() fails we will reply with the full table
 836                  * instead of providing the diff
 837                  */
 838                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 839                 if (bat_priv->tt.last_changeset) {
 840                         memcpy(bat_priv->tt.last_changeset,
 841                                tt_change, tt_change_len);
 842                         bat_priv->tt.last_changeset_len = tt_diff_len;
 843                 }
 844         }
 845         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 846
 847 container_register:
 848         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 849                                        tvlv_len);
 850         kfree(tt_data);
 851 }
 852
 853 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 854 {
 855         struct net_device *net_dev = (struct net_device *)seq->private;
 856         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 857         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 858         struct batadv_tt_common_entry *tt_common_entry;
 859         struct batadv_tt_local_entry *tt_local;
 860         struct batadv_hard_iface *primary_if;
 861         struct batadv_softif_vlan *vlan;
 862         struct hlist_head *head;
 863         unsigned short vid;
 864         uint32_t i;
 865         int last_seen_secs;
 866         int last_seen_msecs;
 867         unsigned long last_seen_jiffies;
 868         bool no_purge;
 869         uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
 870
 871         primary_if = batadv_seq_print_text_primary_if_get(seq);
 872         if (!primary_if)
 873                 goto out;
 874
 875         seq_printf(seq,
 876                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 877                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
 878         seq_printf(seq, "       %-13s  %s %-7s %-9s (%-10s)\n", "Client", "VID",
 879                    "Flags", "Last seen", "CRC");
 880
 881         for (i = 0; i < hash->size; i++) {
 882                 head = &hash->table[i];
 883
 884                 rcu_read_lock();
 885                 hlist_for_each_entry_rcu(tt_common_entry,
 886                                          head, hash_entry) {
 887                         tt_local = container_of(tt_common_entry,
 888                                                 struct batadv_tt_local_entry,
 889                                                 common);
 890                         vid = tt_common_entry->vid;
 891                         last_seen_jiffies = jiffies - tt_local->last_seen;
 892                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 893                         last_seen_secs = last_seen_msecs / 1000;
 894                         last_seen_msecs = last_seen_msecs % 1000;
 895
 896                         no_purge = tt_common_entry->flags & np_flag;
 897
 898                         vlan = batadv_softif_vlan_get(bat_priv, vid);
 899                         if (!vlan) {
 900                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
 901                                            BATADV_PRINT_VID(vid));
 902                                 continue;
 903                         }
 904
 905                         seq_printf(seq,
 906                                    " * %pM %4i [%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 907                                    tt_common_entry->addr,
 908                                    BATADV_PRINT_VID(tt_common_entry->vid),
 909                                    (tt_common_entry->flags &
 910                                     BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 911                                    no_purge ? 'P' : '.',
 912                                    (tt_common_entry->flags &
 913                                     BATADV_TT_CLIENT_NEW ? 'N' : '.'),
 914                                    (tt_common_entry->flags &
 915                                     BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
 916                                    (tt_common_entry->flags &
 917                                     BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 918                                    no_purge ? 0 : last_seen_secs,
 919                                    no_purge ? 0 : last_seen_msecs,
 920                                    vlan->tt.crc);
 921
 922                         batadv_softif_vlan_free_ref(vlan);
 923                 }
 924                 rcu_read_unlock();
 925         }
 926 out:
 927         if (primary_if)
 928                 batadv_hardif_free_ref(primary_if);
 929         return 0;
 930 }
 931
 932 static void
 933 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
 934                             struct batadv_tt_local_entry *tt_local_entry,
 935                             uint16_t flags, const char *message)
 936 {
 937         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
 938
 939         /* The local client has to be marked as "pending to be removed" but has
 940          * to be kept in the table in order to send it in a full table
 941          * response issued before the net ttvn increment (consistency check)
 942          */
 943         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
 944
 945         batadv_dbg(BATADV_DBG_TT, bat_priv,
 946                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
 947                    tt_local_entry->common.addr,
 948                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
 949 }
 950
 951 /**
 952  * batadv_tt_local_remove - logically remove an entry from the local table
 953  * @bat_priv: the bat priv with all the soft interface information
 954  * @addr: the MAC address of the client to remove
 955  * @vid: VLAN identifier
 956  * @message: message to append to the log on deletion
 957  * @roaming: true if the deletion is due to a roaming event
 958  *
 959  * Returns the flags assigned to the local entry before being deleted
 960  */
 961 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
 962                                 const uint8_t *addr, unsigned short vid,
 963                                 const char *message, bool roaming)
 964 {
 965         struct batadv_tt_local_entry *tt_local_entry;
 966         uint16_t flags, curr_flags = BATADV_NO_FLAGS;
 967
 968         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
 969         if (!tt_local_entry)
 970                 goto out;
 971
 972         curr_flags = tt_local_entry->common.flags;
 973
 974         flags = BATADV_TT_CLIENT_DEL;
 975         /* if this global entry addition is due to a roaming, the node has to
 976          * mark the local entry as "roamed" in order to correctly reroute
 977          * packets later
 978          */
 979         if (roaming) {
 980                 flags |= BATADV_TT_CLIENT_ROAM;
 981                 /* mark the local client as ROAMed */
 982                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
 983         }
 984
 985         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
 986                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
 987                                             message);
 988                 goto out;
 989         }
 990         /* if this client has been added right now, it is possible to
 991          * immediately purge it
 992          */
 993         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
 994         hlist_del_rcu(&tt_local_entry->common.hash_entry);
 995         batadv_tt_local_entry_free_ref(tt_local_entry);
 996
 997 out:
 998         if (tt_local_entry)
 999                 batadv_tt_local_entry_free_ref(tt_local_entry);
1000
1001         return curr_flags;
1002 }
1003
1004 /**
1005  * batadv_tt_local_purge_list - purge inactive tt local entries
1006  * @bat_priv: the bat priv with all the soft interface information
1007  * @head: pointer to the list containing the local tt entries
1008  * @timeout: parameter deciding whether a given tt local entry is considered
1009  *  inactive or not
1010  */
1011 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1012                                        struct hlist_head *head,
1013                                        int timeout)
1014 {
1015         struct batadv_tt_local_entry *tt_local_entry;
1016         struct batadv_tt_common_entry *tt_common_entry;
1017         struct hlist_node *node_tmp;
1018
1019         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1020                                   hash_entry) {
1021                 tt_local_entry = container_of(tt_common_entry,
1022                                               struct batadv_tt_local_entry,
1023                                               common);
1024                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1025                         continue;
1026
1027                 /* entry already marked for deletion */
1028                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1029                         continue;
1030
1031                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1032                         continue;
1033
1034                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1035                                             BATADV_TT_CLIENT_DEL, "timed out");
1036         }
1037 }
1038
1039 /**
1040  * batadv_tt_local_purge - purge inactive tt local entries
1041  * @bat_priv: the bat priv with all the soft interface information
1042  * @timeout: parameter deciding whether a given tt local entry is considered
1043  *  inactive or not
1044  */
1045 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1046                                   int timeout)
1047 {
1048         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1049         struct hlist_head *head;
1050         spinlock_t *list_lock; /* protects write access to the hash lists */
1051         uint32_t i;
1052
1053         for (i = 0; i < hash->size; i++) {
1054                 head = &hash->table[i];
1055                 list_lock = &hash->list_locks[i];
1056
1057                 spin_lock_bh(list_lock);
1058                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1059                 spin_unlock_bh(list_lock);
1060         }
1061 }
1062
1063 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1064 {
1065         struct batadv_hashtable *hash;
1066         spinlock_t *list_lock; /* protects write access to the hash lists */
1067         struct batadv_tt_common_entry *tt_common_entry;
1068         struct batadv_tt_local_entry *tt_local;
1069         struct hlist_node *node_tmp;
1070         struct hlist_head *head;
1071         uint32_t i;
1072
1073         if (!bat_priv->tt.local_hash)
1074                 return;
1075
1076         hash = bat_priv->tt.local_hash;
1077
1078         for (i = 0; i < hash->size; i++) {
1079                 head = &hash->table[i];
1080                 list_lock = &hash->list_locks[i];
1081
1082                 spin_lock_bh(list_lock);
1083                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1084                                           head, hash_entry) {
1085                         hlist_del_rcu(&tt_common_entry->hash_entry);
1086                         tt_local = container_of(tt_common_entry,
1087                                                 struct batadv_tt_local_entry,
1088                                                 common);
1089                         batadv_tt_local_entry_free_ref(tt_local);
1090                 }
1091                 spin_unlock_bh(list_lock);
1092         }
1093
1094         batadv_hash_destroy(hash);
1095
1096         bat_priv->tt.local_hash = NULL;
1097 }
1098
1099 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1100 {
1101         if (bat_priv->tt.global_hash)
1102                 return 0;
1103
1104         bat_priv->tt.global_hash = batadv_hash_new(1024);
1105
1106         if (!bat_priv->tt.global_hash)
1107                 return -ENOMEM;
1108
1109         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1110                                    &batadv_tt_global_hash_lock_class_key);
1111
1112         return 0;
1113 }
1114
1115 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1116 {
1117         struct batadv_tt_change_node *entry, *safe;
1118
1119         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1120
1121         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1122                                  list) {
1123                 list_del(&entry->list);
1124                 kfree(entry);
1125         }
1126
1127         atomic_set(&bat_priv->tt.local_changes, 0);
1128         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1129 }
1130
1131 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1132  * batadv_tt_global_entry list
1133  *
1134  * returns it with an increased refcounter, NULL if not found
1135  */
1136 static struct batadv_tt_orig_list_entry *
1137 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1138                                  const struct batadv_orig_node *orig_node)
1139 {
1140         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1141         const struct hlist_head *head;
1142
1143         rcu_read_lock();
1144         head = &entry->orig_list;
1145         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1146                 if (tmp_orig_entry->orig_node != orig_node)
1147                         continue;
1148                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1149                         continue;
1150
1151                 orig_entry = tmp_orig_entry;
1152                 break;
1153         }
1154         rcu_read_unlock();
1155
1156         return orig_entry;
1157 }
1158
1159 /* find out if an orig_node is already in the list of a tt_global_entry.
1160  * returns true if found, false otherwise
1161  */
1162 static bool
1163 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1164                                 const struct batadv_orig_node *orig_node)
1165 {
1166         struct batadv_tt_orig_list_entry *orig_entry;
1167         bool found = false;
1168
1169         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1170         if (orig_entry) {
1171                 found = true;
1172                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1173         }
1174
1175         return found;
1176 }
1177
1178 static void
1179 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1180                                 struct batadv_orig_node *orig_node, int ttvn)
1181 {
1182         struct batadv_tt_orig_list_entry *orig_entry;
1183
1184         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1185         if (orig_entry) {
1186                 /* refresh the ttvn: the current value could be a bogus one that
1187                  * was added during a "temporary client detection"
1188                  */
1189                 orig_entry->ttvn = ttvn;
1190                 goto out;
1191         }
1192
1193         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1194         if (!orig_entry)
1195                 goto out;
1196
1197         INIT_HLIST_NODE(&orig_entry->list);
1198         atomic_inc(&orig_node->refcount);
1199         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1200         orig_entry->orig_node = orig_node;
1201         orig_entry->ttvn = ttvn;
1202         atomic_set(&orig_entry->refcount, 2);
1203
1204         spin_lock_bh(&tt_global->list_lock);
1205         hlist_add_head_rcu(&orig_entry->list,
1206                            &tt_global->orig_list);
1207         spin_unlock_bh(&tt_global->list_lock);
1208 out:
1209         if (orig_entry)
1210                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1211 }
1212
1213 /**
1214  * batadv_tt_global_add - add a new TT global entry or update an existing one
1215  * @bat_priv: the bat priv with all the soft interface information
1216  * @orig_node: the originator announcing the client
1217  * @tt_addr: the mac address of the non-mesh client
1218  * @vid: VLAN identifier
1219  * @flags: TT flags that have to be set for this non-mesh client
1220  * @ttvn: the tt version number ever announcing this non-mesh client
1221  *
1222  * Add a new TT global entry for the given originator. If the entry already
1223  * exists add a new reference to the given originator (a global entry can have
1224  * references to multiple originators) and adjust the flags attribute to reflect
1225  * the function argument.
1226  * If a TT local entry exists for this non-mesh client remove it.
1227  *
1228  * The caller must hold orig_node refcount.
1229  *
1230  * Return true if the new entry has been added, false otherwise
1231  */
1232 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1233                                  struct batadv_orig_node *orig_node,
1234                                  const unsigned char *tt_addr,
1235                                  unsigned short vid, uint16_t flags,
1236                                  uint8_t ttvn)
1237 {
1238         struct batadv_tt_global_entry *tt_global_entry;
1239         struct batadv_tt_local_entry *tt_local_entry;
1240         bool ret = false;
1241         int hash_added;
1242         struct batadv_tt_common_entry *common;
1243         uint16_t local_flags;
1244
1245         /* ignore global entries from backbone nodes */
1246         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1247                 return true;
1248
1249         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1250         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1251
1252         /* if the node already has a local client for this entry, it has to wait
1253          * for a roaming advertisement instead of manually messing up the global
1254          * table
1255          */
1256         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1257             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1258                 goto out;
1259
1260         if (!tt_global_entry) {
1261                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1262                 if (!tt_global_entry)
1263                         goto out;
1264
1265                 common = &tt_global_entry->common;
1266                 memcpy(common->addr, tt_addr, ETH_ALEN);
1267                 common->vid = vid;
1268
1269                 common->flags = flags;
1270                 tt_global_entry->roam_at = 0;
1271                 /* node must store current time in case of roaming. This is
1272                  * needed to purge this entry out on timeout (if nobody claims
1273                  * it)
1274                  */
1275                 if (flags & BATADV_TT_CLIENT_ROAM)
1276                         tt_global_entry->roam_at = jiffies;
1277                 atomic_set(&common->refcount, 2);
1278                 common->added_at = jiffies;
1279
1280                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1281                 spin_lock_init(&tt_global_entry->list_lock);
1282
1283                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1284                                              batadv_compare_tt,
1285                                              batadv_choose_tt, common,
1286                                              &common->hash_entry);
1287
1288                 if (unlikely(hash_added != 0)) {
1289                         /* remove the reference for the hash */
1290                         batadv_tt_global_entry_free_ref(tt_global_entry);
1291                         goto out_remove;
1292                 }
1293         } else {
1294                 common = &tt_global_entry->common;
1295                 /* If there is already a global entry, we can use this one for
1296                  * our processing.
1297                  * But if we are trying to add a temporary client then here are
1298                  * two options at this point:
1299                  * 1) the global client is not a temporary client: the global
1300                  *    client has to be left as it is, temporary information
1301                  *    should never override any already known client state
1302                  * 2) the global client is a temporary client: purge the
1303                  *    originator list and add the new one orig_entry
1304                  */
1305                 if (flags & BATADV_TT_CLIENT_TEMP) {
1306                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1307                                 goto out;
1308                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1309                                                             orig_node))
1310                                 goto out_remove;
1311                         batadv_tt_global_del_orig_list(tt_global_entry);
1312                         goto add_orig_entry;
1313                 }
1314
1315                 /* if the client was temporary added before receiving the first
1316                  * OGM announcing it, we have to clear the TEMP flag
1317                  */
1318                 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1319
1320                 /* the change can carry possible "attribute" flags like the
1321                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1322                  * client entry
1323                  */
1324                 tt_global_entry->common.flags |= flags;
1325
1326                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1327                  * one originator left in the list and we previously received a
1328                  * delete + roaming change for this originator.
1329                  *
1330                  * We should first delete the old originator before adding the
1331                  * new one.
1332                  */
1333                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1334                         batadv_tt_global_del_orig_list(tt_global_entry);
1335                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1336                         tt_global_entry->roam_at = 0;
1337                 }
1338         }
1339 add_orig_entry:
1340         /* add the new orig_entry (if needed) or update it */
1341         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1342
1343         batadv_dbg(BATADV_DBG_TT, bat_priv,
1344                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1345                    common->addr, BATADV_PRINT_VID(common->vid),
1346                    orig_node->orig);
1347         ret = true;
1348
1349 out_remove:
1350
1351         /* remove address from local hash if present */
1352         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1353                                              "global tt received",
1354                                              flags & BATADV_TT_CLIENT_ROAM);
1355         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1356
1357         if (!(flags & BATADV_TT_CLIENT_ROAM))
1358                 /* this is a normal global add. Therefore the client is not in a
1359                  * roaming state anymore.
1360                  */
1361                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1362
1363 out:
1364         if (tt_global_entry)
1365                 batadv_tt_global_entry_free_ref(tt_global_entry);
1366         if (tt_local_entry)
1367                 batadv_tt_local_entry_free_ref(tt_local_entry);
1368         return ret;
1369 }
1370
1371 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
1372  * @bat_priv: the bat priv with all the soft interface information
1373  * @tt_global_entry: global translation table entry to be analyzed
1374  *
1375  * This functon assumes the caller holds rcu_read_lock().
1376  * Returns best originator list entry or NULL on errors.
1377  */
1378 static struct batadv_tt_orig_list_entry *
1379 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1380                             struct batadv_tt_global_entry *tt_global_entry)
1381 {
1382         struct batadv_neigh_node *router, *best_router = NULL;
1383         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1384         struct hlist_head *head;
1385         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1386
1387         head = &tt_global_entry->orig_list;
1388         hlist_for_each_entry_rcu(orig_entry, head, list) {
1389                 router = batadv_orig_node_get_router(orig_entry->orig_node);
1390                 if (!router)
1391                         continue;
1392
1393                 if (best_router &&
1394                     bao->bat_neigh_cmp(router, best_router) <= 0) {
1395                         batadv_neigh_node_free_ref(router);
1396                         continue;
1397                 }
1398
1399                 /* release the refcount for the "old" best */
1400                 if (best_router)
1401                         batadv_neigh_node_free_ref(best_router);
1402
1403                 best_entry = orig_entry;
1404                 best_router = router;
1405         }
1406
1407         if (best_router)
1408                 batadv_neigh_node_free_ref(best_router);
1409
1410         return best_entry;
1411 }
1412
1413 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1414  * for this global entry
1415  * @bat_priv: the bat priv with all the soft interface information
1416  * @tt_global_entry: global translation table entry to be printed
1417  * @seq: debugfs table seq_file struct
1418  *
1419  * This functon assumes the caller holds rcu_read_lock().
1420  */
1421 static void
1422 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1423                              struct batadv_tt_global_entry *tt_global_entry,
1424                              struct seq_file *seq)
1425 {
1426         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1427         struct batadv_tt_common_entry *tt_common_entry;
1428         struct batadv_orig_node_vlan *vlan;
1429         struct hlist_head *head;
1430         uint8_t last_ttvn;
1431         uint16_t flags;
1432
1433         tt_common_entry = &tt_global_entry->common;
1434         flags = tt_common_entry->flags;
1435
1436         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1437         if (best_entry) {
1438                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1439                                                  tt_common_entry->vid);
1440                 if (!vlan) {
1441                         seq_printf(seq,
1442                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1443                                    BATADV_PRINT_VID(tt_common_entry->vid),
1444                                    best_entry->orig_node->orig);
1445                         goto print_list;
1446                 }
1447
1448                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1449                 seq_printf(seq,
1450                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c]\n",
1451                            '*', tt_global_entry->common.addr,
1452                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1453                            best_entry->ttvn, best_entry->orig_node->orig,
1454                            last_ttvn, vlan->tt.crc,
1455                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1456                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1457                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1458
1459                 batadv_orig_node_vlan_free_ref(vlan);
1460         }
1461
1462 print_list:
1463         head = &tt_global_entry->orig_list;
1464
1465         hlist_for_each_entry_rcu(orig_entry, head, list) {
1466                 if (best_entry == orig_entry)
1467                         continue;
1468
1469                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1470                                                  tt_common_entry->vid);
1471                 if (!vlan) {
1472                         seq_printf(seq,
1473                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1474                                    BATADV_PRINT_VID(tt_common_entry->vid),
1475                                    orig_entry->orig_node->orig);
1476                         continue;
1477                 }
1478
1479                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1480                 seq_printf(seq,
1481                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c]\n",
1482                            '+', tt_global_entry->common.addr,
1483                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1484                            orig_entry->ttvn, orig_entry->orig_node->orig,
1485                            last_ttvn, vlan->tt.crc,
1486                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1487                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1488                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1489
1490                 batadv_orig_node_vlan_free_ref(vlan);
1491         }
1492 }
1493
1494 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1495 {
1496         struct net_device *net_dev = (struct net_device *)seq->private;
1497         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1498         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1499         struct batadv_tt_common_entry *tt_common_entry;
1500         struct batadv_tt_global_entry *tt_global;
1501         struct batadv_hard_iface *primary_if;
1502         struct hlist_head *head;
1503         uint32_t i;
1504
1505         primary_if = batadv_seq_print_text_primary_if_get(seq);
1506         if (!primary_if)
1507                 goto out;
1508
1509         seq_printf(seq,
1510                    "Globally announced TT entries received via the mesh %s\n",
1511                    net_dev->name);
1512         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1513                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1514                    "CRC", "Flags");
1515
1516         for (i = 0; i < hash->size; i++) {
1517                 head = &hash->table[i];
1518
1519                 rcu_read_lock();
1520                 hlist_for_each_entry_rcu(tt_common_entry,
1521                                          head, hash_entry) {
1522                         tt_global = container_of(tt_common_entry,
1523                                                  struct batadv_tt_global_entry,
1524                                                  common);
1525                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1526                 }
1527                 rcu_read_unlock();
1528         }
1529 out:
1530         if (primary_if)
1531                 batadv_hardif_free_ref(primary_if);
1532         return 0;
1533 }
1534
1535 /* deletes the orig list of a tt_global_entry */
1536 static void
1537 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1538 {
1539         struct hlist_head *head;
1540         struct hlist_node *safe;
1541         struct batadv_tt_orig_list_entry *orig_entry;
1542
1543         spin_lock_bh(&tt_global_entry->list_lock);
1544         head = &tt_global_entry->orig_list;
1545         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1546                 hlist_del_rcu(&orig_entry->list);
1547                 batadv_tt_global_size_dec(orig_entry->orig_node,
1548                                           tt_global_entry->common.vid);
1549                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1550         }
1551         spin_unlock_bh(&tt_global_entry->list_lock);
1552 }
1553
1554 static void
1555 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
1556                                 struct batadv_tt_global_entry *tt_global_entry,
1557                                 struct batadv_orig_node *orig_node,
1558                                 const char *message)
1559 {
1560         struct hlist_head *head;
1561         struct hlist_node *safe;
1562         struct batadv_tt_orig_list_entry *orig_entry;
1563         unsigned short vid;
1564
1565         spin_lock_bh(&tt_global_entry->list_lock);
1566         head = &tt_global_entry->orig_list;
1567         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1568                 if (orig_entry->orig_node == orig_node) {
1569                         vid = tt_global_entry->common.vid;
1570                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1571                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1572                                    orig_node->orig,
1573                                    tt_global_entry->common.addr,
1574                                    BATADV_PRINT_VID(vid), message);
1575                         hlist_del_rcu(&orig_entry->list);
1576                         batadv_tt_global_size_dec(orig_node,
1577                                                   tt_global_entry->common.vid);
1578                         batadv_tt_orig_list_entry_free_ref(orig_entry);
1579                 }
1580         }
1581         spin_unlock_bh(&tt_global_entry->list_lock);
1582 }
1583
1584 /* If the client is to be deleted, we check if it is the last origantor entry
1585  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1586  * timer, otherwise we simply remove the originator scheduled for deletion.
1587  */
1588 static void
1589 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1590                              struct batadv_tt_global_entry *tt_global_entry,
1591                              struct batadv_orig_node *orig_node,
1592                              const char *message)
1593 {
1594         bool last_entry = true;
1595         struct hlist_head *head;
1596         struct batadv_tt_orig_list_entry *orig_entry;
1597
1598         /* no local entry exists, case 1:
1599          * Check if this is the last one or if other entries exist.
1600          */
1601
1602         rcu_read_lock();
1603         head = &tt_global_entry->orig_list;
1604         hlist_for_each_entry_rcu(orig_entry, head, list) {
1605                 if (orig_entry->orig_node != orig_node) {
1606                         last_entry = false;
1607                         break;
1608                 }
1609         }
1610         rcu_read_unlock();
1611
1612         if (last_entry) {
1613                 /* its the last one, mark for roaming. */
1614                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1615                 tt_global_entry->roam_at = jiffies;
1616         } else
1617                 /* there is another entry, we can simply delete this
1618                  * one and can still use the other one.
1619                  */
1620                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1621                                                 orig_node, message);
1622 }
1623
1624 /**
1625  * batadv_tt_global_del - remove a client from the global table
1626  * @bat_priv: the bat priv with all the soft interface information
1627  * @orig_node: an originator serving this client
1628  * @addr: the mac address of the client
1629  * @vid: VLAN identifier
1630  * @message: a message explaining the reason for deleting the client to print
1631  *  for debugging purpose
1632  * @roaming: true if the deletion has been triggered by a roaming event
1633  */
1634 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1635                                  struct batadv_orig_node *orig_node,
1636                                  const unsigned char *addr, unsigned short vid,
1637                                  const char *message, bool roaming)
1638 {
1639         struct batadv_tt_global_entry *tt_global_entry;
1640         struct batadv_tt_local_entry *local_entry = NULL;
1641
1642         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1643         if (!tt_global_entry)
1644                 goto out;
1645
1646         if (!roaming) {
1647                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1648                                                 orig_node, message);
1649
1650                 if (hlist_empty(&tt_global_entry->orig_list))
1651                         batadv_tt_global_free(bat_priv, tt_global_entry,
1652                                               message);
1653
1654                 goto out;
1655         }
1656
1657         /* if we are deleting a global entry due to a roam
1658          * event, there are two possibilities:
1659          * 1) the client roamed from node A to node B => if there
1660          *    is only one originator left for this client, we mark
1661          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1662          *    wait for node B to claim it. In case of timeout
1663          *    the entry is purged.
1664          *
1665          *    If there are other originators left, we directly delete
1666          *    the originator.
1667          * 2) the client roamed to us => we can directly delete
1668          *    the global entry, since it is useless now.
1669          */
1670         local_entry = batadv_tt_local_hash_find(bat_priv,
1671                                                 tt_global_entry->common.addr,
1672                                                 vid);
1673         if (local_entry) {
1674                 /* local entry exists, case 2: client roamed to us. */
1675                 batadv_tt_global_del_orig_list(tt_global_entry);
1676                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1677         } else
1678                 /* no local entry exists, case 1: check for roaming */
1679                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1680                                              orig_node, message);
1681
1682
1683 out:
1684         if (tt_global_entry)
1685                 batadv_tt_global_entry_free_ref(tt_global_entry);
1686         if (local_entry)
1687                 batadv_tt_local_entry_free_ref(local_entry);
1688 }
1689
1690 /**
1691  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1692  *  given originator matching the provided vid
1693  * @bat_priv: the bat priv with all the soft interface information
1694  * @orig_node: the originator owning the entries to remove
1695  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1696  *  removed
1697  * @message: debug message to print as "reason"
1698  */
1699 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1700                                struct batadv_orig_node *orig_node,
1701                                int32_t match_vid,
1702                                const char *message)
1703 {
1704         struct batadv_tt_global_entry *tt_global;
1705         struct batadv_tt_common_entry *tt_common_entry;
1706         uint32_t i;
1707         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1708         struct hlist_node *safe;
1709         struct hlist_head *head;
1710         spinlock_t *list_lock; /* protects write access to the hash lists */
1711         unsigned short vid;
1712
1713         if (!hash)
1714                 return;
1715
1716         for (i = 0; i < hash->size; i++) {
1717                 head = &hash->table[i];
1718                 list_lock = &hash->list_locks[i];
1719
1720                 spin_lock_bh(list_lock);
1721                 hlist_for_each_entry_safe(tt_common_entry, safe,
1722                                           head, hash_entry) {
1723                         /* remove only matching entries */
1724                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1725                                 continue;
1726
1727                         tt_global = container_of(tt_common_entry,
1728                                                  struct batadv_tt_global_entry,
1729                                                  common);
1730
1731                         batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1732                                                         orig_node, message);
1733
1734                         if (hlist_empty(&tt_global->orig_list)) {
1735                                 vid = tt_global->common.vid;
1736                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1737                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1738                                            tt_global->common.addr,
1739                                            BATADV_PRINT_VID(vid), message);
1740                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1741                                 batadv_tt_global_entry_free_ref(tt_global);
1742                         }
1743                 }
1744                 spin_unlock_bh(list_lock);
1745         }
1746         orig_node->tt_initialised = false;
1747 }
1748
1749 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1750                                       char **msg)
1751 {
1752         bool purge = false;
1753         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1754         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1755
1756         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1757             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1758                 purge = true;
1759                 *msg = "Roaming timeout\n";
1760         }
1761
1762         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1763             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1764                 purge = true;
1765                 *msg = "Temporary client timeout\n";
1766         }
1767
1768         return purge;
1769 }
1770
1771 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1772 {
1773         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1774         struct hlist_head *head;
1775         struct hlist_node *node_tmp;
1776         spinlock_t *list_lock; /* protects write access to the hash lists */
1777         uint32_t i;
1778         char *msg = NULL;
1779         struct batadv_tt_common_entry *tt_common;
1780         struct batadv_tt_global_entry *tt_global;
1781
1782         for (i = 0; i < hash->size; i++) {
1783                 head = &hash->table[i];
1784                 list_lock = &hash->list_locks[i];
1785
1786                 spin_lock_bh(list_lock);
1787                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1788                                           hash_entry) {
1789                         tt_global = container_of(tt_common,
1790                                                  struct batadv_tt_global_entry,
1791                                                  common);
1792
1793                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1794                                 continue;
1795
1796                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1797                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1798                                    tt_global->common.addr,
1799                                    BATADV_PRINT_VID(tt_global->common.vid),
1800                                    msg);
1801
1802                         hlist_del_rcu(&tt_common->hash_entry);
1803
1804                         batadv_tt_global_entry_free_ref(tt_global);
1805                 }
1806                 spin_unlock_bh(list_lock);
1807         }
1808 }
1809
1810 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1811 {
1812         struct batadv_hashtable *hash;
1813         spinlock_t *list_lock; /* protects write access to the hash lists */
1814         struct batadv_tt_common_entry *tt_common_entry;
1815         struct batadv_tt_global_entry *tt_global;
1816         struct hlist_node *node_tmp;
1817         struct hlist_head *head;
1818         uint32_t i;
1819
1820         if (!bat_priv->tt.global_hash)
1821                 return;
1822
1823         hash = bat_priv->tt.global_hash;
1824
1825         for (i = 0; i < hash->size; i++) {
1826                 head = &hash->table[i];
1827                 list_lock = &hash->list_locks[i];
1828
1829                 spin_lock_bh(list_lock);
1830                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1831                                           head, hash_entry) {
1832                         hlist_del_rcu(&tt_common_entry->hash_entry);
1833                         tt_global = container_of(tt_common_entry,
1834                                                  struct batadv_tt_global_entry,
1835                                                  common);
1836                         batadv_tt_global_entry_free_ref(tt_global);
1837                 }
1838                 spin_unlock_bh(list_lock);
1839         }
1840
1841         batadv_hash_destroy(hash);
1842
1843         bat_priv->tt.global_hash = NULL;
1844 }
1845
1846 static bool
1847 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1848                        struct batadv_tt_global_entry *tt_global_entry)
1849 {
1850         bool ret = false;
1851
1852         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1853             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1854                 ret = true;
1855
1856         return ret;
1857 }
1858
1859 /**
1860  * batadv_transtable_search - get the mesh destination for a given client
1861  * @bat_priv: the bat priv with all the soft interface information
1862  * @src: mac address of the source client
1863  * @addr: mac address of the destination client
1864  * @vid: VLAN identifier
1865  *
1866  * Returns a pointer to the originator that was selected as destination in the
1867  * mesh for contacting the client 'addr', NULL otherwise.
1868  * In case of multiple originators serving the same client, the function returns
1869  * the best one (best in terms of metric towards the destination node).
1870  *
1871  * If the two clients are AP isolated the function returns NULL.
1872  */
1873 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1874                                                   const uint8_t *src,
1875                                                   const uint8_t *addr,
1876                                                   unsigned short vid)
1877 {
1878         struct batadv_tt_local_entry *tt_local_entry = NULL;
1879         struct batadv_tt_global_entry *tt_global_entry = NULL;
1880         struct batadv_orig_node *orig_node = NULL;
1881         struct batadv_tt_orig_list_entry *best_entry;
1882         bool ap_isolation_enabled = false;
1883         struct batadv_softif_vlan *vlan;
1884
1885         /* if the AP isolation is requested on a VLAN, then check for its
1886          * setting in the proper VLAN private data structure
1887          */
1888         vlan = batadv_softif_vlan_get(bat_priv, vid);
1889         if (vlan) {
1890                 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
1891                 batadv_softif_vlan_free_ref(vlan);
1892         }
1893
1894         if (src && ap_isolation_enabled) {
1895                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1896                 if (!tt_local_entry ||
1897                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1898                         goto out;
1899         }
1900
1901         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1902         if (!tt_global_entry)
1903                 goto out;
1904
1905         /* check whether the clients should not communicate due to AP
1906          * isolation
1907          */
1908         if (tt_local_entry &&
1909             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1910                 goto out;
1911
1912         rcu_read_lock();
1913         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1914         /* found anything? */
1915         if (best_entry)
1916                 orig_node = best_entry->orig_node;
1917         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1918                 orig_node = NULL;
1919         rcu_read_unlock();
1920
1921 out:
1922         if (tt_global_entry)
1923                 batadv_tt_global_entry_free_ref(tt_global_entry);
1924         if (tt_local_entry)
1925                 batadv_tt_local_entry_free_ref(tt_local_entry);
1926
1927         return orig_node;
1928 }
1929
1930 /**
1931  * batadv_tt_global_crc - calculates the checksum of the local table belonging
1932  *  to the given orig_node
1933  * @bat_priv: the bat priv with all the soft interface information
1934  * @orig_node: originator for which the CRC should be computed
1935  * @vid: VLAN identifier for which the CRC32 has to be computed
1936  *
1937  * This function computes the checksum for the global table corresponding to a
1938  * specific originator. In particular, the checksum is computed as follows: For
1939  * each client connected to the originator the CRC32C of the MAC address and the
1940  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1941  * together.
1942  *
1943  * The idea behind is that CRC32C should be used as much as possible in order to
1944  * produce a unique hash of the table, but since the order which is used to feed
1945  * the CRC32C function affects the result and since every node in the network
1946  * probably sorts the clients differently, the hash function cannot be directly
1947  * computed over the entire table. Hence the CRC32C is used only on
1948  * the single client entry, while all the results are then xor'ed together
1949  * because the XOR operation can combine them all while trying to reduce the
1950  * noise as much as possible.
1951  *
1952  * Returns the checksum of the global table of a given originator.
1953  */
1954 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1955                                      struct batadv_orig_node *orig_node,
1956                                      unsigned short vid)
1957 {
1958         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1959         struct batadv_tt_common_entry *tt_common;
1960         struct batadv_tt_global_entry *tt_global;
1961         struct hlist_head *head;
1962         uint32_t i, crc_tmp, crc = 0;
1963         uint8_t flags;
1964
1965         for (i = 0; i < hash->size; i++) {
1966                 head = &hash->table[i];
1967
1968                 rcu_read_lock();
1969                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1970                         tt_global = container_of(tt_common,
1971                                                  struct batadv_tt_global_entry,
1972                                                  common);
1973                         /* compute the CRC only for entries belonging to the
1974                          * VLAN identified by the vid passed as parameter
1975                          */
1976                         if (tt_common->vid != vid)
1977                                 continue;
1978
1979                         /* Roaming clients are in the global table for
1980                          * consistency only. They don't have to be
1981                          * taken into account while computing the
1982                          * global crc
1983                          */
1984                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
1985                                 continue;
1986                         /* Temporary clients have not been announced yet, so
1987                          * they have to be skipped while computing the global
1988                          * crc
1989                          */
1990                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
1991                                 continue;
1992
1993                         /* find out if this global entry is announced by this
1994                          * originator
1995                          */
1996                         if (!batadv_tt_global_entry_has_orig(tt_global,
1997                                                              orig_node))
1998                                 continue;
1999
2000                         crc_tmp = crc32c(0, &tt_common->vid,
2001                                          sizeof(tt_common->vid));
2002
2003                         /* compute the CRC on flags that have to be kept in sync
2004                          * among nodes
2005                          */
2006                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2007                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2008
2009                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2010                 }
2011                 rcu_read_unlock();
2012         }
2013
2014         return crc;
2015 }
2016
2017 /**
2018  * batadv_tt_local_crc - calculates the checksum of the local table
2019  * @bat_priv: the bat priv with all the soft interface information
2020  * @vid: VLAN identifier for which the CRC32 has to be computed
2021  *
2022  * For details about the computation, please refer to the documentation for
2023  * batadv_tt_global_crc().
2024  *
2025  * Returns the checksum of the local table
2026  */
2027 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2028                                     unsigned short vid)
2029 {
2030         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2031         struct batadv_tt_common_entry *tt_common;
2032         struct hlist_head *head;
2033         uint32_t i, crc_tmp, crc = 0;
2034         uint8_t flags;
2035
2036         for (i = 0; i < hash->size; i++) {
2037                 head = &hash->table[i];
2038
2039                 rcu_read_lock();
2040                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2041                         /* compute the CRC only for entries belonging to the
2042                          * VLAN identified by vid
2043                          */
2044                         if (tt_common->vid != vid)
2045                                 continue;
2046
2047                         /* not yet committed clients have not to be taken into
2048                          * account while computing the CRC
2049                          */
2050                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2051                                 continue;
2052
2053                         crc_tmp = crc32c(0, &tt_common->vid,
2054                                          sizeof(tt_common->vid));
2055
2056                         /* compute the CRC on flags that have to be kept in sync
2057                          * among nodes
2058                          */
2059                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2060                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2061
2062                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2063                 }
2064                 rcu_read_unlock();
2065         }
2066
2067         return crc;
2068 }
2069
2070 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2071 {
2072         struct batadv_tt_req_node *node, *safe;
2073
2074         spin_lock_bh(&bat_priv->tt.req_list_lock);
2075
2076         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2077                 list_del(&node->list);
2078                 kfree(node);
2079         }
2080
2081         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2082 }
2083
2084 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2085                                        struct batadv_orig_node *orig_node,
2086                                        const void *tt_buff,
2087                                        uint16_t tt_buff_len)
2088 {
2089         /* Replace the old buffer only if I received something in the
2090          * last OGM (the OGM could carry no changes)
2091          */
2092         spin_lock_bh(&orig_node->tt_buff_lock);
2093         if (tt_buff_len > 0) {
2094                 kfree(orig_node->tt_buff);
2095                 orig_node->tt_buff_len = 0;
2096                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2097                 if (orig_node->tt_buff) {
2098                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2099                         orig_node->tt_buff_len = tt_buff_len;
2100                 }
2101         }
2102         spin_unlock_bh(&orig_node->tt_buff_lock);
2103 }
2104
2105 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2106 {
2107         struct batadv_tt_req_node *node, *safe;
2108
2109         spin_lock_bh(&bat_priv->tt.req_list_lock);
2110         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2111                 if (batadv_has_timed_out(node->issued_at,
2112                                          BATADV_TT_REQUEST_TIMEOUT)) {
2113                         list_del(&node->list);
2114                         kfree(node);
2115                 }
2116         }
2117         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2118 }
2119
2120 /* returns the pointer to the new tt_req_node struct if no request
2121  * has already been issued for this orig_node, NULL otherwise
2122  */
2123 static struct batadv_tt_req_node *
2124 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2125                        struct batadv_orig_node *orig_node)
2126 {
2127         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2128
2129         spin_lock_bh(&bat_priv->tt.req_list_lock);
2130         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2131                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2132                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2133                                           BATADV_TT_REQUEST_TIMEOUT))
2134                         goto unlock;
2135         }
2136
2137         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2138         if (!tt_req_node)
2139                 goto unlock;
2140
2141         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
2142         tt_req_node->issued_at = jiffies;
2143
2144         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2145 unlock:
2146         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2147         return tt_req_node;
2148 }
2149
2150 /**
2151  * batadv_tt_local_valid - verify that given tt entry is a valid one
2152  * @entry_ptr: to be checked local tt entry
2153  * @data_ptr: not used but definition required to satisfy the callback prototype
2154  *
2155  * Returns 1 if the entry is a valid, 0 otherwise.
2156  */
2157 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2158 {
2159         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2160
2161         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2162                 return 0;
2163         return 1;
2164 }
2165
2166 static int batadv_tt_global_valid(const void *entry_ptr,
2167                                   const void *data_ptr)
2168 {
2169         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2170         const struct batadv_tt_global_entry *tt_global_entry;
2171         const struct batadv_orig_node *orig_node = data_ptr;
2172
2173         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2174             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2175                 return 0;
2176
2177         tt_global_entry = container_of(tt_common_entry,
2178                                        struct batadv_tt_global_entry,
2179                                        common);
2180
2181         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2182 }
2183
2184 /**
2185  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2186  *  specified tt hash
2187  * @bat_priv: the bat priv with all the soft interface information
2188  * @hash: hash table containing the tt entries
2189  * @tt_len: expected tvlv tt data buffer length in number of bytes
2190  * @tvlv_buff: pointer to the buffer to fill with the TT data
2191  * @valid_cb: function to filter tt change entries
2192  * @cb_data: data passed to the filter function as argument
2193  */
2194 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2195                                     struct batadv_hashtable *hash,
2196                                     void *tvlv_buff, uint16_t tt_len,
2197                                     int (*valid_cb)(const void *, const void *),
2198                                     void *cb_data)
2199 {
2200         struct batadv_tt_common_entry *tt_common_entry;
2201         struct batadv_tvlv_tt_change *tt_change;
2202         struct hlist_head *head;
2203         uint16_t tt_tot, tt_num_entries = 0;
2204         uint32_t i;
2205
2206         tt_tot = batadv_tt_entries(tt_len);
2207         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2208
2209         rcu_read_lock();
2210         for (i = 0; i < hash->size; i++) {
2211                 head = &hash->table[i];
2212
2213                 hlist_for_each_entry_rcu(tt_common_entry,
2214                                          head, hash_entry) {
2215                         if (tt_tot == tt_num_entries)
2216                                 break;
2217
2218                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2219                                 continue;
2220
2221                         memcpy(tt_change->addr, tt_common_entry->addr,
2222                                ETH_ALEN);
2223                         tt_change->flags = tt_common_entry->flags;
2224                         tt_change->vid = htons(tt_common_entry->vid);
2225                         memset(tt_change->reserved, 0,
2226                                sizeof(tt_change->reserved));
2227
2228                         tt_num_entries++;
2229                         tt_change++;
2230                 }
2231         }
2232         rcu_read_unlock();
2233 }
2234
2235 /**
2236  * batadv_tt_global_check_crc - check if all the CRCs are correct
2237  * @orig_node: originator for which the CRCs have to be checked
2238  * @tt_vlan: pointer to the first tvlv VLAN entry
2239  * @num_vlan: number of tvlv VLAN entries
2240  * @create: if true, create VLAN objects if not found
2241  *
2242  * Return true if all the received CRCs match the locally stored ones, false
2243  * otherwise
2244  */
2245 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2246                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2247                                        uint16_t num_vlan)
2248 {
2249         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2250         struct batadv_orig_node_vlan *vlan;
2251         int i;
2252
2253         /* check if each received CRC matches the locally stored one */
2254         for (i = 0; i < num_vlan; i++) {
2255                 tt_vlan_tmp = tt_vlan + i;
2256
2257                 /* if orig_node is a backbone node for this VLAN, don't check
2258                  * the CRC as we ignore all the global entries over it
2259                  */
2260                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2261                                                    orig_node->orig,
2262                                                    ntohs(tt_vlan_tmp->vid)))
2263                         continue;
2264
2265                 vlan = batadv_orig_node_vlan_get(orig_node,
2266                                                  ntohs(tt_vlan_tmp->vid));
2267                 if (!vlan)
2268                         return false;
2269
2270                 if (vlan->tt.crc != ntohl(tt_vlan_tmp->crc))
2271                         return false;
2272         }
2273
2274         return true;
2275 }
2276
2277 /**
2278  * batadv_tt_local_update_crc - update all the local CRCs
2279  * @bat_priv: the bat priv with all the soft interface information
2280  */
2281 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2282 {
2283         struct batadv_softif_vlan *vlan;
2284
2285         /* recompute the global CRC for each VLAN */
2286         rcu_read_lock();
2287         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2288                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2289         }
2290         rcu_read_unlock();
2291 }
2292
2293 /**
2294  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2295  * @bat_priv: the bat priv with all the soft interface information
2296  * @orig_node: the orig_node for which the CRCs have to be updated
2297  */
2298 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2299                                         struct batadv_orig_node *orig_node)
2300 {
2301         struct batadv_orig_node_vlan *vlan;
2302         uint32_t crc;
2303
2304         /* recompute the global CRC for each VLAN */
2305         rcu_read_lock();
2306         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2307                 /* if orig_node is a backbone node for this VLAN, don't compute
2308                  * the CRC as we ignore all the global entries over it
2309                  */
2310                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2311                                                    vlan->vid))
2312                         continue;
2313
2314                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2315                 vlan->tt.crc = crc;
2316         }
2317         rcu_read_unlock();
2318 }
2319
2320 /**
2321  * batadv_send_tt_request - send a TT Request message to a given node
2322  * @bat_priv: the bat priv with all the soft interface information
2323  * @dst_orig_node: the destination of the message
2324  * @ttvn: the version number that the source of the message is looking for
2325  * @tt_vlan: pointer to the first tvlv VLAN object to request
2326  * @num_vlan: number of tvlv VLAN entries
2327  * @full_table: ask for the entire translation table if true, while only for the
2328  *  last TT diff otherwise
2329  */
2330 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2331                                   struct batadv_orig_node *dst_orig_node,
2332                                   uint8_t ttvn,
2333                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2334                                   uint16_t num_vlan, bool full_table)
2335 {
2336         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2337         struct batadv_tt_req_node *tt_req_node = NULL;
2338         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2339         struct batadv_hard_iface *primary_if;
2340         bool ret = false;
2341         int i, size;
2342
2343         primary_if = batadv_primary_if_get_selected(bat_priv);
2344         if (!primary_if)
2345                 goto out;
2346
2347         /* The new tt_req will be issued only if I'm not waiting for a
2348          * reply from the same orig_node yet
2349          */
2350         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2351         if (!tt_req_node)
2352                 goto out;
2353
2354         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2355         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2356         if (!tvlv_tt_data)
2357                 goto out;
2358
2359         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2360         tvlv_tt_data->ttvn = ttvn;
2361         tvlv_tt_data->num_vlan = htons(num_vlan);
2362
2363         /* send all the CRCs within the request. This is needed by intermediate
2364          * nodes to ensure they have the correct table before replying
2365          */
2366         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2367         for (i = 0; i < num_vlan; i++) {
2368                 tt_vlan_req->vid = tt_vlan->vid;
2369                 tt_vlan_req->crc = tt_vlan->crc;
2370
2371                 tt_vlan_req++;
2372                 tt_vlan++;
2373         }
2374
2375         if (full_table)
2376                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2377
2378         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2379                    dst_orig_node->orig, full_table ? 'F' : '.');
2380
2381         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2382         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2383                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2384                                  tvlv_tt_data, size);
2385         ret = true;
2386
2387 out:
2388         if (primary_if)
2389                 batadv_hardif_free_ref(primary_if);
2390         if (ret && tt_req_node) {
2391                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2392                 list_del(&tt_req_node->list);
2393                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2394                 kfree(tt_req_node);
2395         }
2396         kfree(tvlv_tt_data);
2397         return ret;
2398 }
2399
2400 /**
2401  * batadv_send_other_tt_response - send reply to tt request concerning another
2402  *  node's translation table
2403  * @bat_priv: the bat priv with all the soft interface information
2404  * @tt_data: tt data containing the tt request information
2405  * @req_src: mac address of tt request sender
2406  * @req_dst: mac address of tt request recipient
2407  *
2408  * Returns true if tt request reply was sent, false otherwise.
2409  */
2410 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2411                                           struct batadv_tvlv_tt_data *tt_data,
2412                                           uint8_t *req_src, uint8_t *req_dst)
2413 {
2414         struct batadv_orig_node *req_dst_orig_node;
2415         struct batadv_orig_node *res_dst_orig_node = NULL;
2416         struct batadv_tvlv_tt_change *tt_change;
2417         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2418         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2419         bool ret = false, full_table;
2420         uint8_t orig_ttvn, req_ttvn;
2421         uint16_t tvlv_len;
2422         int32_t tt_len;
2423
2424         batadv_dbg(BATADV_DBG_TT, bat_priv,
2425                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2426                    req_src, tt_data->ttvn, req_dst,
2427                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2428
2429         /* Let's get the orig node of the REAL destination */
2430         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2431         if (!req_dst_orig_node)
2432                 goto out;
2433
2434         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2435         if (!res_dst_orig_node)
2436                 goto out;
2437
2438         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2439         req_ttvn = tt_data->ttvn;
2440
2441         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2442         /* this node doesn't have the requested data */
2443         if (orig_ttvn != req_ttvn ||
2444             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2445                                         ntohs(tt_data->num_vlan)))
2446                 goto out;
2447
2448         /* If the full table has been explicitly requested */
2449         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2450             !req_dst_orig_node->tt_buff)
2451                 full_table = true;
2452         else
2453                 full_table = false;
2454
2455         /* TT fragmentation hasn't been implemented yet, so send as many
2456          * TT entries fit a single packet as possible only
2457          */
2458         if (!full_table) {
2459                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2460                 tt_len = req_dst_orig_node->tt_buff_len;
2461
2462                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2463                                                               &tvlv_tt_data,
2464                                                               &tt_change,
2465                                                               &tt_len);
2466                 if (!tt_len)
2467                         goto unlock;
2468
2469                 /* Copy the last orig_node's OGM buffer */
2470                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2471                        req_dst_orig_node->tt_buff_len);
2472                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2473         } else {
2474                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2475                  * in the initial part
2476                  */
2477                 tt_len = -1;
2478                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2479                                                               &tvlv_tt_data,
2480                                                               &tt_change,
2481                                                               &tt_len);
2482                 if (!tt_len)
2483                         goto out;
2484
2485                 /* fill the rest of the tvlv with the real TT entries */
2486                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2487                                         tt_change, tt_len,
2488                                         batadv_tt_global_valid,
2489                                         req_dst_orig_node);
2490         }
2491
2492         /* Don't send the response, if larger than fragmented packet. */
2493         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2494         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2495                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2496                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2497                                          res_dst_orig_node->orig);
2498                 goto out;
2499         }
2500
2501         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2502         tvlv_tt_data->ttvn = req_ttvn;
2503
2504         if (full_table)
2505                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2506
2507         batadv_dbg(BATADV_DBG_TT, bat_priv,
2508                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2509                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2510                    full_table ? 'F' : '.', req_ttvn);
2511
2512         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2513
2514         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2515                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2516                                  tvlv_len);
2517
2518         ret = true;
2519         goto out;
2520
2521 unlock:
2522         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2523
2524 out:
2525         if (res_dst_orig_node)
2526                 batadv_orig_node_free_ref(res_dst_orig_node);
2527         if (req_dst_orig_node)
2528                 batadv_orig_node_free_ref(req_dst_orig_node);
2529         kfree(tvlv_tt_data);
2530         return ret;
2531 }
2532
2533 /**
2534  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2535  *  translation table
2536  * @bat_priv: the bat priv with all the soft interface information
2537  * @tt_data: tt data containing the tt request information
2538  * @req_src: mac address of tt request sender
2539  *
2540  * Returns true if tt request reply was sent, false otherwise.
2541  */
2542 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2543                                        struct batadv_tvlv_tt_data *tt_data,
2544                                        uint8_t *req_src)
2545 {
2546         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2547         struct batadv_hard_iface *primary_if = NULL;
2548         struct batadv_tvlv_tt_change *tt_change;
2549         struct batadv_orig_node *orig_node;
2550         uint8_t my_ttvn, req_ttvn;
2551         uint16_t tvlv_len;
2552         bool full_table;
2553         int32_t tt_len;
2554
2555         batadv_dbg(BATADV_DBG_TT, bat_priv,
2556                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2557                    req_src, tt_data->ttvn,
2558                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2559
2560         spin_lock_bh(&bat_priv->tt.commit_lock);
2561
2562         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2563         req_ttvn = tt_data->ttvn;
2564
2565         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2566         if (!orig_node)
2567                 goto out;
2568
2569         primary_if = batadv_primary_if_get_selected(bat_priv);
2570         if (!primary_if)
2571                 goto out;
2572
2573         /* If the full table has been explicitly requested or the gap
2574          * is too big send the whole local translation table
2575          */
2576         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2577             !bat_priv->tt.last_changeset)
2578                 full_table = true;
2579         else
2580                 full_table = false;
2581
2582         /* TT fragmentation hasn't been implemented yet, so send as many
2583          * TT entries fit a single packet as possible only
2584          */
2585         if (!full_table) {
2586                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2587
2588                 tt_len = bat_priv->tt.last_changeset_len;
2589                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2590                                                              &tvlv_tt_data,
2591                                                              &tt_change,
2592                                                              &tt_len);
2593                 if (!tt_len)
2594                         goto unlock;
2595
2596                 /* Copy the last orig_node's OGM buffer */
2597                 memcpy(tt_change, bat_priv->tt.last_changeset,
2598                        bat_priv->tt.last_changeset_len);
2599                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2600         } else {
2601                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2602
2603                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2604                  * in the initial part
2605                  */
2606                 tt_len = -1;
2607                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2608                                                              &tvlv_tt_data,
2609                                                              &tt_change,
2610                                                              &tt_len);
2611                 if (!tt_len)
2612                         goto out;
2613
2614                 /* fill the rest of the tvlv with the real TT entries */
2615                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2616                                         tt_change, tt_len,
2617                                         batadv_tt_local_valid, NULL);
2618         }
2619
2620         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2621         tvlv_tt_data->ttvn = req_ttvn;
2622
2623         if (full_table)
2624                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2625
2626         batadv_dbg(BATADV_DBG_TT, bat_priv,
2627                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2628                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2629
2630         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2631
2632         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2633                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2634                                  tvlv_len);
2635
2636         goto out;
2637
2638 unlock:
2639         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2640 out:
2641         spin_unlock_bh(&bat_priv->tt.commit_lock);
2642         if (orig_node)
2643                 batadv_orig_node_free_ref(orig_node);
2644         if (primary_if)
2645                 batadv_hardif_free_ref(primary_if);
2646         kfree(tvlv_tt_data);
2647         /* The packet was for this host, so it doesn't need to be re-routed */
2648         return true;
2649 }
2650
2651 /**
2652  * batadv_send_tt_response - send reply to tt request
2653  * @bat_priv: the bat priv with all the soft interface information
2654  * @tt_data: tt data containing the tt request information
2655  * @req_src: mac address of tt request sender
2656  * @req_dst: mac address of tt request recipient
2657  *
2658  * Returns true if tt request reply was sent, false otherwise.
2659  */
2660 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2661                                     struct batadv_tvlv_tt_data *tt_data,
2662                                     uint8_t *req_src, uint8_t *req_dst)
2663 {
2664         if (batadv_is_my_mac(bat_priv, req_dst))
2665                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2666         else
2667                 return batadv_send_other_tt_response(bat_priv, tt_data,
2668                                                      req_src, req_dst);
2669 }
2670
2671 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2672                                       struct batadv_orig_node *orig_node,
2673                                       struct batadv_tvlv_tt_change *tt_change,
2674                                       uint16_t tt_num_changes, uint8_t ttvn)
2675 {
2676         int i;
2677         int roams;
2678
2679         for (i = 0; i < tt_num_changes; i++) {
2680                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2681                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2682                         batadv_tt_global_del(bat_priv, orig_node,
2683                                              (tt_change + i)->addr,
2684                                              ntohs((tt_change + i)->vid),
2685                                              "tt removed by changes",
2686                                              roams);
2687                 } else {
2688                         if (!batadv_tt_global_add(bat_priv, orig_node,
2689                                                   (tt_change + i)->addr,
2690                                                   ntohs((tt_change + i)->vid),
2691                                                   (tt_change + i)->flags, ttvn))
2692                                 /* In case of problem while storing a
2693                                  * global_entry, we stop the updating
2694                                  * procedure without committing the
2695                                  * ttvn change. This will avoid to send
2696                                  * corrupted data on tt_request
2697                                  */
2698                                 return;
2699                 }
2700         }
2701         orig_node->tt_initialised = true;
2702 }
2703
2704 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2705                                   struct batadv_tvlv_tt_change *tt_change,
2706                                   uint8_t ttvn, uint8_t *resp_src,
2707                                   uint16_t num_entries)
2708 {
2709         struct batadv_orig_node *orig_node;
2710
2711         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2712         if (!orig_node)
2713                 goto out;
2714
2715         /* Purge the old table first.. */
2716         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2717                                   "Received full table");
2718
2719         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2720                                   ttvn);
2721
2722         spin_lock_bh(&orig_node->tt_buff_lock);
2723         kfree(orig_node->tt_buff);
2724         orig_node->tt_buff_len = 0;
2725         orig_node->tt_buff = NULL;
2726         spin_unlock_bh(&orig_node->tt_buff_lock);
2727
2728         atomic_set(&orig_node->last_ttvn, ttvn);
2729
2730 out:
2731         if (orig_node)
2732                 batadv_orig_node_free_ref(orig_node);
2733 }
2734
2735 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2736                                      struct batadv_orig_node *orig_node,
2737                                      uint16_t tt_num_changes, uint8_t ttvn,
2738                                      struct batadv_tvlv_tt_change *tt_change)
2739 {
2740         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2741                                   tt_num_changes, ttvn);
2742
2743         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2744                                    batadv_tt_len(tt_num_changes));
2745         atomic_set(&orig_node->last_ttvn, ttvn);
2746 }
2747
2748 /**
2749  * batadv_is_my_client - check if a client is served by the local node
2750  * @bat_priv: the bat priv with all the soft interface information
2751  * @addr: the mac adress of the client to check
2752  * @vid: VLAN identifier
2753  *
2754  * Returns true if the client is served by this node, false otherwise.
2755  */
2756 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2757                          unsigned short vid)
2758 {
2759         struct batadv_tt_local_entry *tt_local_entry;
2760         bool ret = false;
2761
2762         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2763         if (!tt_local_entry)
2764                 goto out;
2765         /* Check if the client has been logically deleted (but is kept for
2766          * consistency purpose)
2767          */
2768         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2769             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2770                 goto out;
2771         ret = true;
2772 out:
2773         if (tt_local_entry)
2774                 batadv_tt_local_entry_free_ref(tt_local_entry);
2775         return ret;
2776 }
2777
2778 /**
2779  * batadv_handle_tt_response - process incoming tt reply
2780  * @bat_priv: the bat priv with all the soft interface information
2781  * @tt_data: tt data containing the tt request information
2782  * @resp_src: mac address of tt reply sender
2783  * @num_entries: number of tt change entries appended to the tt data
2784  */
2785 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2786                                       struct batadv_tvlv_tt_data *tt_data,
2787                                       uint8_t *resp_src, uint16_t num_entries)
2788 {
2789         struct batadv_tt_req_node *node, *safe;
2790         struct batadv_orig_node *orig_node = NULL;
2791         struct batadv_tvlv_tt_change *tt_change;
2792         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2793         uint16_t change_offset;
2794
2795         batadv_dbg(BATADV_DBG_TT, bat_priv,
2796                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2797                    resp_src, tt_data->ttvn, num_entries,
2798                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2799
2800         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2801         if (!orig_node)
2802                 goto out;
2803
2804         spin_lock_bh(&orig_node->tt_lock);
2805
2806         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2807         change_offset *= ntohs(tt_data->num_vlan);
2808         change_offset += sizeof(*tt_data);
2809         tvlv_ptr += change_offset;
2810
2811         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2812         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2813                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2814                                       resp_src, num_entries);
2815         } else {
2816                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2817                                          tt_data->ttvn, tt_change);
2818         }
2819
2820         /* Recalculate the CRC for this orig_node and store it */
2821         batadv_tt_global_update_crc(bat_priv, orig_node);
2822
2823         spin_unlock_bh(&orig_node->tt_lock);
2824
2825         /* Delete the tt_req_node from pending tt_requests list */
2826         spin_lock_bh(&bat_priv->tt.req_list_lock);
2827         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2828                 if (!batadv_compare_eth(node->addr, resp_src))
2829                         continue;
2830                 list_del(&node->list);
2831                 kfree(node);
2832         }
2833
2834         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2835 out:
2836         if (orig_node)
2837                 batadv_orig_node_free_ref(orig_node);
2838 }
2839
2840 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2841 {
2842         struct batadv_tt_roam_node *node, *safe;
2843
2844         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2845
2846         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2847                 list_del(&node->list);
2848                 kfree(node);
2849         }
2850
2851         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2852 }
2853
2854 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2855 {
2856         struct batadv_tt_roam_node *node, *safe;
2857
2858         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2859         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2860                 if (!batadv_has_timed_out(node->first_time,
2861                                           BATADV_ROAMING_MAX_TIME))
2862                         continue;
2863
2864                 list_del(&node->list);
2865                 kfree(node);
2866         }
2867         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2868 }
2869
2870 /* This function checks whether the client already reached the
2871  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2872  * will not be sent.
2873  *
2874  * returns true if the ROAMING_ADV can be sent, false otherwise
2875  */
2876 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2877                                        uint8_t *client)
2878 {
2879         struct batadv_tt_roam_node *tt_roam_node;
2880         bool ret = false;
2881
2882         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2883         /* The new tt_req will be issued only if I'm not waiting for a
2884          * reply from the same orig_node yet
2885          */
2886         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2887                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2888                         continue;
2889
2890                 if (batadv_has_timed_out(tt_roam_node->first_time,
2891                                          BATADV_ROAMING_MAX_TIME))
2892                         continue;
2893
2894                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2895                         /* Sorry, you roamed too many times! */
2896                         goto unlock;
2897                 ret = true;
2898                 break;
2899         }
2900
2901         if (!ret) {
2902                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2903                 if (!tt_roam_node)
2904                         goto unlock;
2905
2906                 tt_roam_node->first_time = jiffies;
2907                 atomic_set(&tt_roam_node->counter,
2908                            BATADV_ROAMING_MAX_COUNT - 1);
2909                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2910
2911                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2912                 ret = true;
2913         }
2914
2915 unlock:
2916         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2917         return ret;
2918 }
2919
2920 /**
2921  * batadv_send_roam_adv - send a roaming advertisement message
2922  * @bat_priv: the bat priv with all the soft interface information
2923  * @client: mac address of the roaming client
2924  * @vid: VLAN identifier
2925  * @orig_node: message destination
2926  *
2927  * Send a ROAMING_ADV message to the node which was previously serving this
2928  * client. This is done to inform the node that from now on all traffic destined
2929  * for this particular roamed client has to be forwarded to the sender of the
2930  * roaming message.
2931  */
2932 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2933                                  unsigned short vid,
2934                                  struct batadv_orig_node *orig_node)
2935 {
2936         struct batadv_hard_iface *primary_if;
2937         struct batadv_tvlv_roam_adv tvlv_roam;
2938
2939         primary_if = batadv_primary_if_get_selected(bat_priv);
2940         if (!primary_if)
2941                 goto out;
2942
2943         /* before going on we have to check whether the client has
2944          * already roamed to us too many times
2945          */
2946         if (!batadv_tt_check_roam_count(bat_priv, client))
2947                 goto out;
2948
2949         batadv_dbg(BATADV_DBG_TT, bat_priv,
2950                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2951                    orig_node->orig, client, BATADV_PRINT_VID(vid));
2952
2953         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2954
2955         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
2956         tvlv_roam.vid = htons(vid);
2957
2958         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2959                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
2960                                  &tvlv_roam, sizeof(tvlv_roam));
2961
2962 out:
2963         if (primary_if)
2964                 batadv_hardif_free_ref(primary_if);
2965 }
2966
2967 static void batadv_tt_purge(struct work_struct *work)
2968 {
2969         struct delayed_work *delayed_work;
2970         struct batadv_priv_tt *priv_tt;
2971         struct batadv_priv *bat_priv;
2972
2973         delayed_work = container_of(work, struct delayed_work, work);
2974         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2975         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2976
2977         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
2978         batadv_tt_global_purge(bat_priv);
2979         batadv_tt_req_purge(bat_priv);
2980         batadv_tt_roam_purge(bat_priv);
2981
2982         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
2983                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
2984 }
2985
2986 void batadv_tt_free(struct batadv_priv *bat_priv)
2987 {
2988         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
2989         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
2990
2991         cancel_delayed_work_sync(&bat_priv->tt.work);
2992
2993         batadv_tt_local_table_free(bat_priv);
2994         batadv_tt_global_table_free(bat_priv);
2995         batadv_tt_req_list_free(bat_priv);
2996         batadv_tt_changes_list_free(bat_priv);
2997         batadv_tt_roam_list_free(bat_priv);
2998
2999         kfree(bat_priv->tt.last_changeset);
3000 }
3001
3002 /**
3003  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3004  *  table and possibly count them in the TT size
3005  * @bat_priv: the bat priv with all the soft interface information
3006  * @flags: the flag to switch
3007  * @enable: whether to set or unset the flag
3008  * @count: whether to increase the TT size by the number of changed entries
3009  */
3010 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3011                                       uint16_t flags, bool enable, bool count)
3012 {
3013         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3014         struct batadv_tt_common_entry *tt_common_entry;
3015         uint16_t changed_num = 0;
3016         struct hlist_head *head;
3017         uint32_t i;
3018
3019         if (!hash)
3020                 return;
3021
3022         for (i = 0; i < hash->size; i++) {
3023                 head = &hash->table[i];
3024
3025                 rcu_read_lock();
3026                 hlist_for_each_entry_rcu(tt_common_entry,
3027                                          head, hash_entry) {
3028                         if (enable) {
3029                                 if ((tt_common_entry->flags & flags) == flags)
3030                                         continue;
3031                                 tt_common_entry->flags |= flags;
3032                         } else {
3033                                 if (!(tt_common_entry->flags & flags))
3034                                         continue;
3035                                 tt_common_entry->flags &= ~flags;
3036                         }
3037                         changed_num++;
3038
3039                         if (!count)
3040                                 continue;
3041
3042                         batadv_tt_local_size_inc(bat_priv,
3043                                                  tt_common_entry->vid);
3044                 }
3045                 rcu_read_unlock();
3046         }
3047 }
3048
3049 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3050 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3051 {
3052         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3053         struct batadv_tt_common_entry *tt_common;
3054         struct batadv_tt_local_entry *tt_local;
3055         struct hlist_node *node_tmp;
3056         struct hlist_head *head;
3057         spinlock_t *list_lock; /* protects write access to the hash lists */
3058         uint32_t i;
3059
3060         if (!hash)
3061                 return;
3062
3063         for (i = 0; i < hash->size; i++) {
3064                 head = &hash->table[i];
3065                 list_lock = &hash->list_locks[i];
3066
3067                 spin_lock_bh(list_lock);
3068                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3069                                           hash_entry) {
3070                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3071                                 continue;
3072
3073                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3074                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3075                                    tt_common->addr,
3076                                    BATADV_PRINT_VID(tt_common->vid));
3077
3078                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3079                         hlist_del_rcu(&tt_common->hash_entry);
3080                         tt_local = container_of(tt_common,
3081                                                 struct batadv_tt_local_entry,
3082                                                 common);
3083                         batadv_tt_local_entry_free_ref(tt_local);
3084                 }
3085                 spin_unlock_bh(list_lock);
3086         }
3087 }
3088
3089 /**
3090  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3091  *  which have been queued in the time since the last commit
3092  * @bat_priv: the bat priv with all the soft interface information
3093  *
3094  * Caller must hold tt->commit_lock.
3095  */
3096 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3097 {
3098         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3099                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3100                         batadv_tt_tvlv_container_update(bat_priv);
3101                 return;
3102         }
3103
3104         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3105
3106         batadv_tt_local_purge_pending_clients(bat_priv);
3107         batadv_tt_local_update_crc(bat_priv);
3108
3109         /* Increment the TTVN only once per OGM interval */
3110         atomic_inc(&bat_priv->tt.vn);
3111         batadv_dbg(BATADV_DBG_TT, bat_priv,
3112                    "Local changes committed, updating to ttvn %u\n",
3113                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3114
3115         /* reset the sending counter */
3116         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3117         batadv_tt_tvlv_container_update(bat_priv);
3118 }
3119
3120 /**
3121  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3122  *  have been queued in the time since the last commit
3123  * @bat_priv: the bat priv with all the soft interface information
3124  */
3125 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3126 {
3127         spin_lock_bh(&bat_priv->tt.commit_lock);
3128         batadv_tt_local_commit_changes_nolock(bat_priv);
3129         spin_unlock_bh(&bat_priv->tt.commit_lock);
3130 }
3131
3132 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3133                            uint8_t *dst, unsigned short vid)
3134 {
3135         struct batadv_tt_local_entry *tt_local_entry = NULL;
3136         struct batadv_tt_global_entry *tt_global_entry = NULL;
3137         struct batadv_softif_vlan *vlan;
3138         bool ret = false;
3139
3140         vlan = batadv_softif_vlan_get(bat_priv, vid);
3141         if (!vlan || !atomic_read(&vlan->ap_isolation))
3142                 goto out;
3143
3144         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3145         if (!tt_local_entry)
3146                 goto out;
3147
3148         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3149         if (!tt_global_entry)
3150                 goto out;
3151
3152         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3153                 goto out;
3154
3155         ret = true;
3156
3157 out:
3158         if (vlan)
3159                 batadv_softif_vlan_free_ref(vlan);
3160         if (tt_global_entry)
3161                 batadv_tt_global_entry_free_ref(tt_global_entry);
3162         if (tt_local_entry)
3163                 batadv_tt_local_entry_free_ref(tt_local_entry);
3164         return ret;
3165 }
3166
3167 /**
3168  * batadv_tt_update_orig - update global translation table with new tt
3169  *  information received via ogms
3170  * @bat_priv: the bat priv with all the soft interface information
3171  * @orig: the orig_node of the ogm
3172  * @tt_vlan: pointer to the first tvlv VLAN entry
3173  * @tt_num_vlan: number of tvlv VLAN entries
3174  * @tt_change: pointer to the first entry in the TT buffer
3175  * @tt_num_changes: number of tt changes inside the tt buffer
3176  * @ttvn: translation table version number of this changeset
3177  * @tt_crc: crc32 checksum of orig node's translation table
3178  */
3179 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3180                                   struct batadv_orig_node *orig_node,
3181                                   const void *tt_buff, uint16_t tt_num_vlan,
3182                                   struct batadv_tvlv_tt_change *tt_change,
3183                                   uint16_t tt_num_changes, uint8_t ttvn)
3184 {
3185         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3186         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3187         bool full_table = true;
3188
3189         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3190         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3191          * increased by one -> we can apply the attached changes
3192          */
3193         if ((!orig_node->tt_initialised && ttvn == 1) ||
3194             ttvn - orig_ttvn == 1) {
3195                 /* the OGM could not contain the changes due to their size or
3196                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3197                  * times.
3198                  * In this case send a tt request
3199                  */
3200                 if (!tt_num_changes) {
3201                         full_table = false;
3202                         goto request_table;
3203                 }
3204
3205                 spin_lock_bh(&orig_node->tt_lock);
3206
3207                 tt_change = (struct batadv_tvlv_tt_change *)tt_buff;
3208                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3209                                          ttvn, tt_change);
3210
3211                 /* Even if we received the precomputed crc with the OGM, we
3212                  * prefer to recompute it to spot any possible inconsistency
3213                  * in the global table
3214                  */
3215                 batadv_tt_global_update_crc(bat_priv, orig_node);
3216
3217                 spin_unlock_bh(&orig_node->tt_lock);
3218
3219                 /* The ttvn alone is not enough to guarantee consistency
3220                  * because a single value could represent different states
3221                  * (due to the wrap around). Thus a node has to check whether
3222                  * the resulting table (after applying the changes) is still
3223                  * consistent or not. E.g. a node could disconnect while its
3224                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3225                  * checking the CRC value is mandatory to detect the
3226                  * inconsistency
3227                  */
3228                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3229                                                 tt_num_vlan))
3230                         goto request_table;
3231         } else {
3232                 /* if we missed more than one change or our tables are not
3233                  * in sync anymore -> request fresh tt data
3234                  */
3235                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
3236                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3237                                                 tt_num_vlan)) {
3238 request_table:
3239                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3240                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3241                                    orig_node->orig, ttvn, orig_ttvn,
3242                                    tt_num_changes);
3243                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3244                                                tt_vlan, tt_num_vlan,
3245                                                full_table);
3246                         return;
3247                 }
3248         }
3249 }
3250
3251 /**
3252  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3253  * @bat_priv: the bat priv with all the soft interface information
3254  * @addr: the mac address of the client to check
3255  * @vid: VLAN identifier
3256  *
3257  * Returns true if we know that the client has moved from its old originator
3258  * to another one. This entry is still kept for consistency purposes and will be
3259  * deleted later by a DEL or because of timeout
3260  */
3261 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3262                                         uint8_t *addr, unsigned short vid)
3263 {
3264         struct batadv_tt_global_entry *tt_global_entry;
3265         bool ret = false;
3266
3267         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3268         if (!tt_global_entry)
3269                 goto out;
3270
3271         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3272         batadv_tt_global_entry_free_ref(tt_global_entry);
3273 out:
3274         return ret;
3275 }
3276
3277 /**
3278  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3279  * @bat_priv: the bat priv with all the soft interface information
3280  * @addr: the mac address of the local client to query
3281  * @vid: VLAN identifier
3282  *
3283  * Returns true if the local client is known to be roaming (it is not served by
3284  * this node anymore) or not. If yes, the client is still present in the table
3285  * to keep the latter consistent with the node TTVN
3286  */
3287 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3288                                        uint8_t *addr, unsigned short vid)
3289 {
3290         struct batadv_tt_local_entry *tt_local_entry;
3291         bool ret = false;
3292
3293         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3294         if (!tt_local_entry)
3295                 goto out;
3296
3297         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3298         batadv_tt_local_entry_free_ref(tt_local_entry);
3299 out:
3300         return ret;
3301 }
3302
3303 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3304                                           struct batadv_orig_node *orig_node,
3305                                           const unsigned char *addr,
3306                                           unsigned short vid)
3307 {
3308         bool ret = false;
3309
3310         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3311                                   BATADV_TT_CLIENT_TEMP,
3312                                   atomic_read(&orig_node->last_ttvn)))
3313                 goto out;
3314
3315         batadv_dbg(BATADV_DBG_TT, bat_priv,
3316                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3317                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3318         ret = true;
3319 out:
3320         return ret;
3321 }
3322
3323 /**
3324  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3325  *  maximum packet size that can be transported through the mesh
3326  * @soft_iface: netdev struct of the mesh interface
3327  *
3328  * Remove entries older than 'timeout' and half timeout if more entries need
3329  * to be removed.
3330  */
3331 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3332 {
3333         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3334         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3335         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3336         bool reduced = false;
3337
3338         spin_lock_bh(&bat_priv->tt.commit_lock);
3339
3340         while (true) {
3341                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3342                 if (packet_size_max >= table_size)
3343                         break;
3344
3345                 batadv_tt_local_purge(bat_priv, timeout);
3346                 batadv_tt_local_purge_pending_clients(bat_priv);
3347
3348                 timeout /= 2;
3349                 reduced = true;
3350                 net_ratelimited_function(batadv_info, soft_iface,
3351                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3352                                          packet_size_max);
3353         }
3354
3355         /* commit these changes immediately, to avoid synchronization problem
3356          * with the TTVN
3357          */
3358         if (reduced)
3359                 batadv_tt_local_commit_changes_nolock(bat_priv);
3360
3361         spin_unlock_bh(&bat_priv->tt.commit_lock);
3362 }
3363
3364 /**
3365  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3366  * @bat_priv: the bat priv with all the soft interface information
3367  * @orig: the orig_node of the ogm
3368  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3369  * @tvlv_value: tvlv buffer containing the gateway data
3370  * @tvlv_value_len: tvlv buffer length
3371  */
3372 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3373                                           struct batadv_orig_node *orig,
3374                                           uint8_t flags, void *tvlv_value,
3375                                           uint16_t tvlv_value_len)
3376 {
3377         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3378         struct batadv_tvlv_tt_change *tt_change;
3379         struct batadv_tvlv_tt_data *tt_data;
3380         uint16_t num_entries, num_vlan;
3381
3382         if (tvlv_value_len < sizeof(*tt_data))
3383                 return;
3384
3385         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3386         tvlv_value_len -= sizeof(*tt_data);
3387
3388         num_vlan = ntohs(tt_data->num_vlan);
3389
3390         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3391                 return;
3392
3393         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3394         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3395         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3396
3397         num_entries = batadv_tt_entries(tvlv_value_len);
3398
3399         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3400                               num_entries, tt_data->ttvn);
3401 }
3402
3403 /**
3404  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3405  *  container
3406  * @bat_priv: the bat priv with all the soft interface information
3407  * @src: mac address of tt tvlv sender
3408  * @dst: mac address of tt tvlv recipient
3409  * @tvlv_value: tvlv buffer containing the tt data
3410  * @tvlv_value_len: tvlv buffer length
3411  *
3412  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3413  * otherwise.
3414  */
3415 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3416                                              uint8_t *src, uint8_t *dst,
3417                                              void *tvlv_value,
3418                                              uint16_t tvlv_value_len)
3419 {
3420         struct batadv_tvlv_tt_data *tt_data;
3421         uint16_t tt_vlan_len, tt_num_entries;
3422         char tt_flag;
3423         bool ret;
3424
3425         if (tvlv_value_len < sizeof(*tt_data))
3426                 return NET_RX_SUCCESS;
3427
3428         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3429         tvlv_value_len -= sizeof(*tt_data);
3430
3431         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3432         tt_vlan_len *= ntohs(tt_data->num_vlan);
3433
3434         if (tvlv_value_len < tt_vlan_len)
3435                 return NET_RX_SUCCESS;
3436
3437         tvlv_value_len -= tt_vlan_len;
3438         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3439
3440         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3441         case BATADV_TT_REQUEST:
3442                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3443
3444                 /* If this node cannot provide a TT response the tt_request is
3445                  * forwarded
3446                  */
3447                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3448                 if (!ret) {
3449                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3450                                 tt_flag = 'F';
3451                         else
3452                                 tt_flag = '.';
3453
3454                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3455                                    "Routing TT_REQUEST to %pM [%c]\n",
3456                                    dst, tt_flag);
3457                         /* tvlv API will re-route the packet */
3458                         return NET_RX_DROP;
3459                 }
3460                 break;
3461         case BATADV_TT_RESPONSE:
3462                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3463
3464                 if (batadv_is_my_mac(bat_priv, dst)) {
3465                         batadv_handle_tt_response(bat_priv, tt_data,
3466                                                   src, tt_num_entries);
3467                         return NET_RX_SUCCESS;
3468                 }
3469
3470                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3471                         tt_flag =  'F';
3472                 else
3473                         tt_flag = '.';
3474
3475                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3476                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3477
3478                 /* tvlv API will re-route the packet */
3479                 return NET_RX_DROP;
3480         }
3481
3482         return NET_RX_SUCCESS;
3483 }
3484
3485 /**
3486  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3487  * @bat_priv: the bat priv with all the soft interface information
3488  * @src: mac address of tt tvlv sender
3489  * @dst: mac address of tt tvlv recipient
3490  * @tvlv_value: tvlv buffer containing the tt data
3491  * @tvlv_value_len: tvlv buffer length
3492  *
3493  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3494  * otherwise.
3495  */
3496 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3497                                                uint8_t *src, uint8_t *dst,
3498                                                void *tvlv_value,
3499                                                uint16_t tvlv_value_len)
3500 {
3501         struct batadv_tvlv_roam_adv *roaming_adv;
3502         struct batadv_orig_node *orig_node = NULL;
3503
3504         /* If this node is not the intended recipient of the
3505          * roaming advertisement the packet is forwarded
3506          * (the tvlv API will re-route the packet).
3507          */
3508         if (!batadv_is_my_mac(bat_priv, dst))
3509                 return NET_RX_DROP;
3510
3511         if (tvlv_value_len < sizeof(*roaming_adv))
3512                 goto out;
3513
3514         orig_node = batadv_orig_hash_find(bat_priv, src);
3515         if (!orig_node)
3516                 goto out;
3517
3518         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3519         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3520
3521         batadv_dbg(BATADV_DBG_TT, bat_priv,
3522                    "Received ROAMING_ADV from %pM (client %pM)\n",
3523                    src, roaming_adv->client);
3524
3525         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3526                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3527                              atomic_read(&orig_node->last_ttvn) + 1);
3528
3529 out:
3530         if (orig_node)
3531                 batadv_orig_node_free_ref(orig_node);
3532         return NET_RX_SUCCESS;
3533 }
3534
3535 /**
3536  * batadv_tt_init - initialise the translation table internals
3537  * @bat_priv: the bat priv with all the soft interface information
3538  *
3539  * Return 0 on success or negative error number in case of failure.
3540  */
3541 int batadv_tt_init(struct batadv_priv *bat_priv)
3542 {
3543         int ret;
3544
3545         /* synchronized flags must be remote */
3546         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3547
3548         ret = batadv_tt_local_init(bat_priv);
3549         if (ret < 0)
3550                 return ret;
3551
3552         ret = batadv_tt_global_init(bat_priv);
3553         if (ret < 0)
3554                 return ret;
3555
3556         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3557                                      batadv_tt_tvlv_unicast_handler_v1,
3558                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3559
3560         batadv_tvlv_handler_register(bat_priv, NULL,
3561                                      batadv_roam_tvlv_unicast_handler_v1,
3562                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3563
3564         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3565         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3566                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3567
3568         return 1;
3569 }