kernel/net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19 #include "translation-table.h"
  20 #include "soft-interface.h"
  21 #include "hard-interface.h"
  22 #include "send.h"
  23 #include "hash.h"
  24 #include "originator.h"
  25 #include "routing.h"
  26 #include "bridge_loop_avoidance.h"
  27 #include "multicast.h"
  28
  29 #include <linux/crc32c.h>
  30
  31 /* hash class keys */
  32 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  33 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  34
  35 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
  36                                  unsigned short vid,
  37                                  struct batadv_orig_node *orig_node);
  38 static void batadv_tt_purge(struct work_struct *work);
  39 static void
  40 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  41 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  42                                  struct batadv_orig_node *orig_node,
  43                                  const unsigned char *addr,
  44                                  unsigned short vid, const char *message,
  45                                  bool roaming);
  46
  47 /* returns 1 if they are the same mac addr */
  48 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  49 {
  50         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  51                                          hash_entry);
  52
  53         return batadv_compare_eth(data1, data2);
  54 }
  55
  56 /**
  57  * batadv_choose_tt - return the index of the tt entry in the hash table
  58  * @data: pointer to the tt_common_entry object to map
  59  * @size: the size of the hash table
  60  *
  61  * Returns the hash index where the object represented by 'data' should be
  62  * stored at.
  63  */
  64 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
  65 {
  66         struct batadv_tt_common_entry *tt;
  67         uint32_t hash = 0;
  68
  69         tt = (struct batadv_tt_common_entry *)data;
  70         hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
  71         hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
  72
  73         hash += (hash << 3);
  74         hash ^= (hash >> 11);
  75         hash += (hash << 15);
  76
  77         return hash % size;
  78 }
  79
  80 /**
  81  * batadv_tt_hash_find - look for a client in the given hash table
  82  * @hash: the hash table to search
  83  * @addr: the mac address of the client to look for
  84  * @vid: VLAN identifier
  85  *
  86  * Returns a pointer to the tt_common struct belonging to the searched client if
  87  * found, NULL otherwise.
  88  */
  89 static struct batadv_tt_common_entry *
  90 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
  91                     unsigned short vid)
  92 {
  93         struct hlist_head *head;
  94         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
  95         uint32_t index;
  96
  97         if (!hash)
  98                 return NULL;
  99
 100         ether_addr_copy(to_search.addr, addr);
 101         to_search.vid = vid;
 102
 103         index = batadv_choose_tt(&to_search, hash->size);
 104         head = &hash->table[index];
 105
 106         rcu_read_lock();
 107         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 108                 if (!batadv_compare_eth(tt, addr))
 109                         continue;
 110
 111                 if (tt->vid != vid)
 112                         continue;
 113
 114                 if (!atomic_inc_not_zero(&tt->refcount))
 115                         continue;
 116
 117                 tt_tmp = tt;
 118                 break;
 119         }
 120         rcu_read_unlock();
 121
 122         return tt_tmp;
 123 }
 124
 125 /**
 126  * batadv_tt_local_hash_find - search the local table for a given client
 127  * @bat_priv: the bat priv with all the soft interface information
 128  * @addr: the mac address of the client to look for
 129  * @vid: VLAN identifier
 130  *
 131  * Returns a pointer to the corresponding tt_local_entry struct if the client is
 132  * found, NULL otherwise.
 133  */
 134 static struct batadv_tt_local_entry *
 135 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 136                           unsigned short vid)
 137 {
 138         struct batadv_tt_common_entry *tt_common_entry;
 139         struct batadv_tt_local_entry *tt_local_entry = NULL;
 140
 141         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 142                                               vid);
 143         if (tt_common_entry)
 144                 tt_local_entry = container_of(tt_common_entry,
 145                                               struct batadv_tt_local_entry,
 146                                               common);
 147         return tt_local_entry;
 148 }
 149
 150 /**
 151  * batadv_tt_global_hash_find - search the global table for a given client
 152  * @bat_priv: the bat priv with all the soft interface information
 153  * @addr: the mac address of the client to look for
 154  * @vid: VLAN identifier
 155  *
 156  * Returns a pointer to the corresponding tt_global_entry struct if the client
 157  * is found, NULL otherwise.
 158  */
 159 static struct batadv_tt_global_entry *
 160 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 161                            unsigned short vid)
 162 {
 163         struct batadv_tt_common_entry *tt_common_entry;
 164         struct batadv_tt_global_entry *tt_global_entry = NULL;
 165
 166         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 167                                               vid);
 168         if (tt_common_entry)
 169                 tt_global_entry = container_of(tt_common_entry,
 170                                                struct batadv_tt_global_entry,
 171                                                common);
 172         return tt_global_entry;
 173 }
 174
 175 static void
 176 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 177 {
 178         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 179                 kfree_rcu(tt_local_entry, common.rcu);
 180 }
 181
 182 /**
 183  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
 184  *  tt_global_entry and possibly free it
 185  * @tt_global_entry: the object to free
 186  */
 187 static void
 188 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 189 {
 190         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 191                 batadv_tt_global_del_orig_list(tt_global_entry);
 192                 kfree_rcu(tt_global_entry, common.rcu);
 193         }
 194 }
 195
 196 /**
 197  * batadv_tt_global_hash_count - count the number of orig entries
 198  * @hash: hash table containing the tt entries
 199  * @addr: the mac address of the client to count entries for
 200  * @vid: VLAN identifier
 201  *
 202  * Return the number of originators advertising the given address/data
 203  * (excluding ourself).
 204  */
 205 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
 206                                 const uint8_t *addr, unsigned short vid)
 207 {
 208         struct batadv_tt_global_entry *tt_global_entry;
 209         int count;
 210
 211         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 212         if (!tt_global_entry)
 213                 return 0;
 214
 215         count = atomic_read(&tt_global_entry->orig_list_count);
 216         batadv_tt_global_entry_free_ref(tt_global_entry);
 217
 218         return count;
 219 }
 220
 221 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 222 {
 223         struct batadv_tt_orig_list_entry *orig_entry;
 224
 225         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 226
 227         /* We are in an rcu callback here, therefore we cannot use
 228          * batadv_orig_node_free_ref() and its call_rcu():
 229          * An rcu_barrier() wouldn't wait for that to finish
 230          */
 231         batadv_orig_node_free_ref_now(orig_entry->orig_node);
 232         kfree(orig_entry);
 233 }
 234
 235 /**
 236  * batadv_tt_local_size_mod - change the size by v of the local table identified
 237  *  by vid
 238  * @bat_priv: the bat priv with all the soft interface information
 239  * @vid: the VLAN identifier of the sub-table to change
 240  * @v: the amount to sum to the local table size
 241  */
 242 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 243                                      unsigned short vid, int v)
 244 {
 245         struct batadv_softif_vlan *vlan;
 246
 247         vlan = batadv_softif_vlan_get(bat_priv, vid);
 248         if (!vlan)
 249                 return;
 250
 251         atomic_add(v, &vlan->tt.num_entries);
 252
 253         batadv_softif_vlan_free_ref(vlan);
 254 }
 255
 256 /**
 257  * batadv_tt_local_size_inc - increase by one the local table size for the given
 258  *  vid
 259  * @bat_priv: the bat priv with all the soft interface information
 260  * @vid: the VLAN identifier
 261  */
 262 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 263                                      unsigned short vid)
 264 {
 265         batadv_tt_local_size_mod(bat_priv, vid, 1);
 266 }
 267
 268 /**
 269  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 270  *  vid
 271  * @bat_priv: the bat priv with all the soft interface information
 272  * @vid: the VLAN identifier
 273  */
 274 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 275                                      unsigned short vid)
 276 {
 277         batadv_tt_local_size_mod(bat_priv, vid, -1);
 278 }
 279
 280 /**
 281  * batadv_tt_global_size_mod - change the size by v of the local table
 282  *  identified by vid
 283  * @bat_priv: the bat priv with all the soft interface information
 284  * @vid: the VLAN identifier
 285  * @v: the amount to sum to the global table size
 286  */
 287 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 288                                       unsigned short vid, int v)
 289 {
 290         struct batadv_orig_node_vlan *vlan;
 291
 292         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 293         if (!vlan)
 294                 return;
 295
 296         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 297                 spin_lock_bh(&orig_node->vlan_list_lock);
 298                 list_del_rcu(&vlan->list);
 299                 spin_unlock_bh(&orig_node->vlan_list_lock);
 300                 batadv_orig_node_vlan_free_ref(vlan);
 301         }
 302
 303         batadv_orig_node_vlan_free_ref(vlan);
 304 }
 305
 306 /**
 307  * batadv_tt_global_size_inc - increase by one the global table size for the
 308  *  given vid
 309  * @orig_node: the originator which global table size has to be decreased
 310  * @vid: the vlan identifier
 311  */
 312 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 313                                       unsigned short vid)
 314 {
 315         batadv_tt_global_size_mod(orig_node, vid, 1);
 316 }
 317
 318 /**
 319  * batadv_tt_global_size_dec - decrease by one the global table size for the
 320  *  given vid
 321  * @orig_node: the originator which global table size has to be decreased
 322  * @vid: the vlan identifier
 323  */
 324 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 325                                       unsigned short vid)
 326 {
 327         batadv_tt_global_size_mod(orig_node, vid, -1);
 328 }
 329
 330 static void
 331 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 332 {
 333         if (!atomic_dec_and_test(&orig_entry->refcount))
 334                 return;
 335
 336         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 337 }
 338
 339 /**
 340  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 341  * @bat_priv: the bat priv with all the soft interface information
 342  * @tt_local_entry: the TT entry involved in the event
 343  * @event_flags: flags to store in the event structure
 344  */
 345 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 346                                   struct batadv_tt_local_entry *tt_local_entry,
 347                                   uint8_t event_flags)
 348 {
 349         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 350         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 351         uint8_t flags = common->flags | event_flags;
 352         bool event_removed = false;
 353         bool del_op_requested, del_op_entry;
 354
 355         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 356         if (!tt_change_node)
 357                 return;
 358
 359         tt_change_node->change.flags = flags;
 360         memset(tt_change_node->change.reserved, 0,
 361                sizeof(tt_change_node->change.reserved));
 362         ether_addr_copy(tt_change_node->change.addr, common->addr);
 363         tt_change_node->change.vid = htons(common->vid);
 364
 365         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 366
 367         /* check for ADD+DEL or DEL+ADD events */
 368         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 369         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 370                                  list) {
 371                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 372                         continue;
 373
 374                 /* DEL+ADD in the same orig interval have no effect and can be
 375                  * removed to avoid silly behaviour on the receiver side. The
 376                  * other way around (ADD+DEL) can happen in case of roaming of
 377                  * a client still in the NEW state. Roaming of NEW clients is
 378                  * now possible due to automatically recognition of "temporary"
 379                  * clients
 380                  */
 381                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 382                 if (!del_op_requested && del_op_entry)
 383                         goto del;
 384                 if (del_op_requested && !del_op_entry)
 385                         goto del;
 386
 387                 /* this is a second add in the same originator interval. It
 388                  * means that flags have been changed: update them!
 389                  */
 390                 if (!del_op_requested && !del_op_entry)
 391                         entry->change.flags = flags;
 392
 393                 continue;
 394 del:
 395                 list_del(&entry->list);
 396                 kfree(entry);
 397                 kfree(tt_change_node);
 398                 event_removed = true;
 399                 goto unlock;
 400         }
 401
 402         /* track the change in the OGMinterval list */
 403         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 404
 405 unlock:
 406         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 407
 408         if (event_removed)
 409                 atomic_dec(&bat_priv->tt.local_changes);
 410         else
 411                 atomic_inc(&bat_priv->tt.local_changes);
 412 }
 413
 414 /**
 415  * batadv_tt_len - compute length in bytes of given number of tt changes
 416  * @changes_num: number of tt changes
 417  *
 418  * Returns computed length in bytes.
 419  */
 420 static int batadv_tt_len(int changes_num)
 421 {
 422         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 423 }
 424
 425 /**
 426  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 427  * @tt_len: available space
 428  *
 429  * Returns the number of entries.
 430  */
 431 static uint16_t batadv_tt_entries(uint16_t tt_len)
 432 {
 433         return tt_len / batadv_tt_len(1);
 434 }
 435
 436 /**
 437  * batadv_tt_local_table_transmit_size - calculates the local translation table
 438  *  size when transmitted over the air
 439  * @bat_priv: the bat priv with all the soft interface information
 440  *
 441  * Returns local translation table size in bytes.
 442  */
 443 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 444 {
 445         uint16_t num_vlan = 0, tt_local_entries = 0;
 446         struct batadv_softif_vlan *vlan;
 447         int hdr_size;
 448
 449         rcu_read_lock();
 450         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 451                 num_vlan++;
 452                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 453         }
 454         rcu_read_unlock();
 455
 456         /* header size of tvlv encapsulated tt response payload */
 457         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 458         hdr_size += sizeof(struct batadv_tvlv_hdr);
 459         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 460         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 461
 462         return hdr_size + batadv_tt_len(tt_local_entries);
 463 }
 464
 465 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 466 {
 467         if (bat_priv->tt.local_hash)
 468                 return 0;
 469
 470         bat_priv->tt.local_hash = batadv_hash_new(1024);
 471
 472         if (!bat_priv->tt.local_hash)
 473                 return -ENOMEM;
 474
 475         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 476                                    &batadv_tt_local_hash_lock_class_key);
 477
 478         return 0;
 479 }
 480
 481 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 482                                   struct batadv_tt_global_entry *tt_global,
 483                                   const char *message)
 484 {
 485         batadv_dbg(BATADV_DBG_TT, bat_priv,
 486                    "Deleting global tt entry %pM (vid: %d): %s\n",
 487                    tt_global->common.addr,
 488                    BATADV_PRINT_VID(tt_global->common.vid), message);
 489
 490         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 491                            batadv_choose_tt, &tt_global->common);
 492         batadv_tt_global_entry_free_ref(tt_global);
 493 }
 494
 495 /**
 496  * batadv_tt_local_add - add a new client to the local table or update an
 497  *  existing client
 498  * @soft_iface: netdev struct of the mesh interface
 499  * @addr: the mac address of the client to add
 500  * @vid: VLAN identifier
 501  * @ifindex: index of the interface where the client is connected to (useful to
 502  *  identify wireless clients)
 503  * @mark: the value contained in the skb->mark field of the received packet (if
 504  *  any)
 505  *
 506  * Returns true if the client was successfully added, false otherwise.
 507  */
 508 bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 509                          unsigned short vid, int ifindex, uint32_t mark)
 510 {
 511         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 512         struct batadv_tt_local_entry *tt_local;
 513         struct batadv_tt_global_entry *tt_global = NULL;
 514         struct batadv_softif_vlan *vlan;
 515         struct net_device *in_dev = NULL;
 516         struct hlist_head *head;
 517         struct batadv_tt_orig_list_entry *orig_entry;
 518         int hash_added, table_size, packet_size_max;
 519         bool ret = false, roamed_back = false;
 520         uint8_t remote_flags;
 521         uint32_t match_mark;
 522
 523         if (ifindex != BATADV_NULL_IFINDEX)
 524                 in_dev = dev_get_by_index(&init_net, ifindex);
 525
 526         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 527
 528         if (!is_multicast_ether_addr(addr))
 529                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 530
 531         if (tt_local) {
 532                 tt_local->last_seen = jiffies;
 533                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 534                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 535                                    "Re-adding pending client %pM (vid: %d)\n",
 536                                    addr, BATADV_PRINT_VID(vid));
 537                         /* whatever the reason why the PENDING flag was set,
 538                          * this is a client which was enqueued to be removed in
 539                          * this orig_interval. Since it popped up again, the
 540                          * flag can be reset like it was never enqueued
 541                          */
 542                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 543                         goto add_event;
 544                 }
 545
 546                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 547                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 548                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 549                                    addr, BATADV_PRINT_VID(vid));
 550                         /* the ROAM flag is set because this client roamed away
 551                          * and the node got a roaming_advertisement message. Now
 552                          * that the client popped up again at its original
 553                          * location such flag can be unset
 554                          */
 555                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 556                         roamed_back = true;
 557                 }
 558                 goto check_roaming;
 559         }
 560
 561         /* Ignore the client if we cannot send it in a full table response. */
 562         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 563         table_size += batadv_tt_len(1);
 564         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 565         if (table_size > packet_size_max) {
 566                 net_ratelimited_function(batadv_info, soft_iface,
 567                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 568                                          table_size, packet_size_max, addr);
 569                 goto out;
 570         }
 571
 572         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
 573         if (!tt_local)
 574                 goto out;
 575
 576         /* increase the refcounter of the related vlan */
 577         vlan = batadv_softif_vlan_get(bat_priv, vid);
 578
 579         batadv_dbg(BATADV_DBG_TT, bat_priv,
 580                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 581                    addr, BATADV_PRINT_VID(vid),
 582                    (uint8_t)atomic_read(&bat_priv->tt.vn));
 583
 584         ether_addr_copy(tt_local->common.addr, addr);
 585         /* The local entry has to be marked as NEW to avoid to send it in
 586          * a full table response going out before the next ttvn increment
 587          * (consistency check)
 588          */
 589         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 590         tt_local->common.vid = vid;
 591         if (batadv_is_wifi_netdev(in_dev))
 592                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 593         atomic_set(&tt_local->common.refcount, 2);
 594         tt_local->last_seen = jiffies;
 595         tt_local->common.added_at = tt_local->last_seen;
 596
 597         /* the batman interface mac and multicast addresses should never be
 598          * purged
 599          */
 600         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
 601             is_multicast_ether_addr(addr))
 602                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 603
 604         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 605                                      batadv_choose_tt, &tt_local->common,
 606                                      &tt_local->common.hash_entry);
 607
 608         if (unlikely(hash_added != 0)) {
 609                 /* remove the reference for the hash */
 610                 batadv_tt_local_entry_free_ref(tt_local);
 611                 batadv_softif_vlan_free_ref(vlan);
 612                 goto out;
 613         }
 614
 615 add_event:
 616         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 617
 618 check_roaming:
 619         /* Check whether it is a roaming, but don't do anything if the roaming
 620          * process has already been handled
 621          */
 622         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 623                 /* These node are probably going to update their tt table */
 624                 head = &tt_global->orig_list;
 625                 rcu_read_lock();
 626                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 627                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 628                                              tt_global->common.vid,
 629                                              orig_entry->orig_node);
 630                 }
 631                 rcu_read_unlock();
 632                 if (roamed_back) {
 633                         batadv_tt_global_free(bat_priv, tt_global,
 634                                               "Roaming canceled");
 635                         tt_global = NULL;
 636                 } else {
 637                         /* The global entry has to be marked as ROAMING and
 638                          * has to be kept for consistency purpose
 639                          */
 640                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 641                         tt_global->roam_at = jiffies;
 642                 }
 643         }
 644
 645         /* store the current remote flags before altering them. This helps
 646          * understanding is flags are changing or not
 647          */
 648         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 649
 650         if (batadv_is_wifi_netdev(in_dev))
 651                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 652         else
 653                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 654
 655         /* check the mark in the skb: if it's equal to the configured
 656          * isolation_mark, it means the packet is coming from an isolated
 657          * non-mesh client
 658          */
 659         match_mark = (mark & bat_priv->isolation_mark_mask);
 660         if (bat_priv->isolation_mark_mask &&
 661             match_mark == bat_priv->isolation_mark)
 662                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 663         else
 664                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 665
 666         /* if any "dynamic" flag has been modified, resend an ADD event for this
 667          * entry so that all the nodes can get the new flags
 668          */
 669         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 670                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 671
 672         ret = true;
 673 out:
 674         if (in_dev)
 675                 dev_put(in_dev);
 676         if (tt_local)
 677                 batadv_tt_local_entry_free_ref(tt_local);
 678         if (tt_global)
 679                 batadv_tt_global_entry_free_ref(tt_global);
 680         return ret;
 681 }
 682
 683 /**
 684  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 685  *  within a TT Response directed to another node
 686  * @orig_node: originator for which the TT data has to be prepared
 687  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 688  * @tt_change: uninitialised pointer to the address of the area where the TT
 689  *  changed can be stored
 690  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 691  *  function reserves the amount of space needed to send the entire global TT
 692  *  table. In case of success the value is updated with the real amount of
 693  *  reserved bytes
 694
 695  * Allocate the needed amount of memory for the entire TT TVLV and write its
 696  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 697  * objects, one per active VLAN served by the originator node.
 698  *
 699  * Return the size of the allocated buffer or 0 in case of failure.
 700  */
 701 static uint16_t
 702 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 703                                    struct batadv_tvlv_tt_data **tt_data,
 704                                    struct batadv_tvlv_tt_change **tt_change,
 705                                    int32_t *tt_len)
 706 {
 707         uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
 708         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 709         struct batadv_orig_node_vlan *vlan;
 710         uint8_t *tt_change_ptr;
 711
 712         rcu_read_lock();
 713         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 714                 num_vlan++;
 715                 num_entries += atomic_read(&vlan->tt.num_entries);
 716         }
 717
 718         change_offset = sizeof(**tt_data);
 719         change_offset += num_vlan * sizeof(*tt_vlan);
 720
 721         /* if tt_len is negative, allocate the space needed by the full table */
 722         if (*tt_len < 0)
 723                 *tt_len = batadv_tt_len(num_entries);
 724
 725         tvlv_len = *tt_len;
 726         tvlv_len += change_offset;
 727
 728         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 729         if (!*tt_data) {
 730                 *tt_len = 0;
 731                 goto out;
 732         }
 733
 734         (*tt_data)->flags = BATADV_NO_FLAGS;
 735         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 736         (*tt_data)->num_vlan = htons(num_vlan);
 737
 738         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 739         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 740                 tt_vlan->vid = htons(vlan->vid);
 741                 tt_vlan->crc = htonl(vlan->tt.crc);
 742
 743                 tt_vlan++;
 744         }
 745
 746         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 747         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 748
 749 out:
 750         rcu_read_unlock();
 751         return tvlv_len;
 752 }
 753
 754 /**
 755  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 756  *  node
 757  * @bat_priv: the bat priv with all the soft interface information
 758  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 759  * @tt_change: uninitialised pointer to the address of the area where the TT
 760  *  changes can be stored
 761  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 762  *  function reserves the amount of space needed to send the entire local TT
 763  *  table. In case of success the value is updated with the real amount of
 764  *  reserved bytes
 765  *
 766  * Allocate the needed amount of memory for the entire TT TVLV and write its
 767  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 768  * objects, one per active VLAN.
 769  *
 770  * Return the size of the allocated buffer or 0 in case of failure.
 771  */
 772 static uint16_t
 773 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 774                                   struct batadv_tvlv_tt_data **tt_data,
 775                                   struct batadv_tvlv_tt_change **tt_change,
 776                                   int32_t *tt_len)
 777 {
 778         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 779         struct batadv_softif_vlan *vlan;
 780         uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
 781         uint8_t *tt_change_ptr;
 782         int change_offset;
 783
 784         rcu_read_lock();
 785         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 786                 num_vlan++;
 787                 num_entries += atomic_read(&vlan->tt.num_entries);
 788         }
 789
 790         change_offset = sizeof(**tt_data);
 791         change_offset += num_vlan * sizeof(*tt_vlan);
 792
 793         /* if tt_len is negative, allocate the space needed by the full table */
 794         if (*tt_len < 0)
 795                 *tt_len = batadv_tt_len(num_entries);
 796
 797         tvlv_len = *tt_len;
 798         tvlv_len += change_offset;
 799
 800         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 801         if (!*tt_data) {
 802                 tvlv_len = 0;
 803                 goto out;
 804         }
 805
 806         (*tt_data)->flags = BATADV_NO_FLAGS;
 807         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 808         (*tt_data)->num_vlan = htons(num_vlan);
 809
 810         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 811         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 812                 tt_vlan->vid = htons(vlan->vid);
 813                 tt_vlan->crc = htonl(vlan->tt.crc);
 814
 815                 tt_vlan++;
 816         }
 817
 818         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 819         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 820
 821 out:
 822         rcu_read_unlock();
 823         return tvlv_len;
 824 }
 825
 826 /**
 827  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 828  *  after local tt changes have been committed
 829  * @bat_priv: the bat priv with all the soft interface information
 830  */
 831 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 832 {
 833         struct batadv_tt_change_node *entry, *safe;
 834         struct batadv_tvlv_tt_data *tt_data;
 835         struct batadv_tvlv_tt_change *tt_change;
 836         int tt_diff_len, tt_change_len = 0;
 837         int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
 838         uint16_t tvlv_len;
 839
 840         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 841         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 842
 843         /* if we have too many changes for one packet don't send any
 844          * and wait for the tt table request which will be fragmented
 845          */
 846         if (tt_diff_len > bat_priv->soft_iface->mtu)
 847                 tt_diff_len = 0;
 848
 849         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 850                                                      &tt_change, &tt_diff_len);
 851         if (!tvlv_len)
 852                 return;
 853
 854         tt_data->flags = BATADV_TT_OGM_DIFF;
 855
 856         if (tt_diff_len == 0)
 857                 goto container_register;
 858
 859         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 860         atomic_set(&bat_priv->tt.local_changes, 0);
 861
 862         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 863                                  list) {
 864                 if (tt_diff_entries_count < tt_diff_entries_num) {
 865                         memcpy(tt_change + tt_diff_entries_count,
 866                                &entry->change,
 867                                sizeof(struct batadv_tvlv_tt_change));
 868                         tt_diff_entries_count++;
 869                 }
 870                 list_del(&entry->list);
 871                 kfree(entry);
 872         }
 873         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 874
 875         /* Keep the buffer for possible tt_request */
 876         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 877         kfree(bat_priv->tt.last_changeset);
 878         bat_priv->tt.last_changeset_len = 0;
 879         bat_priv->tt.last_changeset = NULL;
 880         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 881         /* check whether this new OGM has no changes due to size problems */
 882         if (tt_diff_entries_count > 0) {
 883                 /* if kmalloc() fails we will reply with the full table
 884                  * instead of providing the diff
 885                  */
 886                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 887                 if (bat_priv->tt.last_changeset) {
 888                         memcpy(bat_priv->tt.last_changeset,
 889                                tt_change, tt_change_len);
 890                         bat_priv->tt.last_changeset_len = tt_diff_len;
 891                 }
 892         }
 893         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 894
 895 container_register:
 896         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 897                                        tvlv_len);
 898         kfree(tt_data);
 899 }
 900
 901 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 902 {
 903         struct net_device *net_dev = (struct net_device *)seq->private;
 904         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 905         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 906         struct batadv_tt_common_entry *tt_common_entry;
 907         struct batadv_tt_local_entry *tt_local;
 908         struct batadv_hard_iface *primary_if;
 909         struct batadv_softif_vlan *vlan;
 910         struct hlist_head *head;
 911         unsigned short vid;
 912         uint32_t i;
 913         int last_seen_secs;
 914         int last_seen_msecs;
 915         unsigned long last_seen_jiffies;
 916         bool no_purge;
 917         uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
 918
 919         primary_if = batadv_seq_print_text_primary_if_get(seq);
 920         if (!primary_if)
 921                 goto out;
 922
 923         seq_printf(seq,
 924                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 925                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
 926         seq_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
 927                    "Flags", "Last seen", "CRC");
 928
 929         for (i = 0; i < hash->size; i++) {
 930                 head = &hash->table[i];
 931
 932                 rcu_read_lock();
 933                 hlist_for_each_entry_rcu(tt_common_entry,
 934                                          head, hash_entry) {
 935                         tt_local = container_of(tt_common_entry,
 936                                                 struct batadv_tt_local_entry,
 937                                                 common);
 938                         vid = tt_common_entry->vid;
 939                         last_seen_jiffies = jiffies - tt_local->last_seen;
 940                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 941                         last_seen_secs = last_seen_msecs / 1000;
 942                         last_seen_msecs = last_seen_msecs % 1000;
 943
 944                         no_purge = tt_common_entry->flags & np_flag;
 945
 946                         vlan = batadv_softif_vlan_get(bat_priv, vid);
 947                         if (!vlan) {
 948                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
 949                                            BATADV_PRINT_VID(vid));
 950                                 continue;
 951                         }
 952
 953                         seq_printf(seq,
 954                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 955                                    tt_common_entry->addr,
 956                                    BATADV_PRINT_VID(tt_common_entry->vid),
 957                                    (tt_common_entry->flags &
 958                                     BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 959                                    no_purge ? 'P' : '.',
 960                                    (tt_common_entry->flags &
 961                                     BATADV_TT_CLIENT_NEW ? 'N' : '.'),
 962                                    (tt_common_entry->flags &
 963                                     BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
 964                                    (tt_common_entry->flags &
 965                                     BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 966                                    (tt_common_entry->flags &
 967                                     BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
 968                                    no_purge ? 0 : last_seen_secs,
 969                                    no_purge ? 0 : last_seen_msecs,
 970                                    vlan->tt.crc);
 971
 972                         batadv_softif_vlan_free_ref(vlan);
 973                 }
 974                 rcu_read_unlock();
 975         }
 976 out:
 977         if (primary_if)
 978                 batadv_hardif_free_ref(primary_if);
 979         return 0;
 980 }
 981
 982 static void
 983 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
 984                             struct batadv_tt_local_entry *tt_local_entry,
 985                             uint16_t flags, const char *message)
 986 {
 987         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
 988
 989         /* The local client has to be marked as "pending to be removed" but has
 990          * to be kept in the table in order to send it in a full table
 991          * response issued before the net ttvn increment (consistency check)
 992          */
 993         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
 994
 995         batadv_dbg(BATADV_DBG_TT, bat_priv,
 996                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
 997                    tt_local_entry->common.addr,
 998                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
 999 }
1000
1001 /**
1002  * batadv_tt_local_remove - logically remove an entry from the local table
1003  * @bat_priv: the bat priv with all the soft interface information
1004  * @addr: the MAC address of the client to remove
1005  * @vid: VLAN identifier
1006  * @message: message to append to the log on deletion
1007  * @roaming: true if the deletion is due to a roaming event
1008  *
1009  * Returns the flags assigned to the local entry before being deleted
1010  */
1011 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
1012                                 const uint8_t *addr, unsigned short vid,
1013                                 const char *message, bool roaming)
1014 {
1015         struct batadv_tt_local_entry *tt_local_entry;
1016         uint16_t flags, curr_flags = BATADV_NO_FLAGS;
1017         struct batadv_softif_vlan *vlan;
1018
1019         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1020         if (!tt_local_entry)
1021                 goto out;
1022
1023         curr_flags = tt_local_entry->common.flags;
1024
1025         flags = BATADV_TT_CLIENT_DEL;
1026         /* if this global entry addition is due to a roaming, the node has to
1027          * mark the local entry as "roamed" in order to correctly reroute
1028          * packets later
1029          */
1030         if (roaming) {
1031                 flags |= BATADV_TT_CLIENT_ROAM;
1032                 /* mark the local client as ROAMed */
1033                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1034         }
1035
1036         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1037                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1038                                             message);
1039                 goto out;
1040         }
1041         /* if this client has been added right now, it is possible to
1042          * immediately purge it
1043          */
1044         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1045         hlist_del_rcu(&tt_local_entry->common.hash_entry);
1046         batadv_tt_local_entry_free_ref(tt_local_entry);
1047
1048         /* decrease the reference held for this vlan */
1049         vlan = batadv_softif_vlan_get(bat_priv, vid);
1050         batadv_softif_vlan_free_ref(vlan);
1051         batadv_softif_vlan_free_ref(vlan);
1052
1053 out:
1054         if (tt_local_entry)
1055                 batadv_tt_local_entry_free_ref(tt_local_entry);
1056
1057         return curr_flags;
1058 }
1059
1060 /**
1061  * batadv_tt_local_purge_list - purge inactive tt local entries
1062  * @bat_priv: the bat priv with all the soft interface information
1063  * @head: pointer to the list containing the local tt entries
1064  * @timeout: parameter deciding whether a given tt local entry is considered
1065  *  inactive or not
1066  */
1067 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1068                                        struct hlist_head *head,
1069                                        int timeout)
1070 {
1071         struct batadv_tt_local_entry *tt_local_entry;
1072         struct batadv_tt_common_entry *tt_common_entry;
1073         struct hlist_node *node_tmp;
1074
1075         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1076                                   hash_entry) {
1077                 tt_local_entry = container_of(tt_common_entry,
1078                                               struct batadv_tt_local_entry,
1079                                               common);
1080                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1081                         continue;
1082
1083                 /* entry already marked for deletion */
1084                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1085                         continue;
1086
1087                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1088                         continue;
1089
1090                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1091                                             BATADV_TT_CLIENT_DEL, "timed out");
1092         }
1093 }
1094
1095 /**
1096  * batadv_tt_local_purge - purge inactive tt local entries
1097  * @bat_priv: the bat priv with all the soft interface information
1098  * @timeout: parameter deciding whether a given tt local entry is considered
1099  *  inactive or not
1100  */
1101 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1102                                   int timeout)
1103 {
1104         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1105         struct hlist_head *head;
1106         spinlock_t *list_lock; /* protects write access to the hash lists */
1107         uint32_t i;
1108
1109         for (i = 0; i < hash->size; i++) {
1110                 head = &hash->table[i];
1111                 list_lock = &hash->list_locks[i];
1112
1113                 spin_lock_bh(list_lock);
1114                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1115                 spin_unlock_bh(list_lock);
1116         }
1117 }
1118
1119 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1120 {
1121         struct batadv_hashtable *hash;
1122         spinlock_t *list_lock; /* protects write access to the hash lists */
1123         struct batadv_tt_common_entry *tt_common_entry;
1124         struct batadv_tt_local_entry *tt_local;
1125         struct batadv_softif_vlan *vlan;
1126         struct hlist_node *node_tmp;
1127         struct hlist_head *head;
1128         uint32_t i;
1129
1130         if (!bat_priv->tt.local_hash)
1131                 return;
1132
1133         hash = bat_priv->tt.local_hash;
1134
1135         for (i = 0; i < hash->size; i++) {
1136                 head = &hash->table[i];
1137                 list_lock = &hash->list_locks[i];
1138
1139                 spin_lock_bh(list_lock);
1140                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1141                                           head, hash_entry) {
1142                         hlist_del_rcu(&tt_common_entry->hash_entry);
1143                         tt_local = container_of(tt_common_entry,
1144                                                 struct batadv_tt_local_entry,
1145                                                 common);
1146
1147                         /* decrease the reference held for this vlan */
1148                         vlan = batadv_softif_vlan_get(bat_priv,
1149                                                       tt_common_entry->vid);
1150                         batadv_softif_vlan_free_ref(vlan);
1151                         batadv_softif_vlan_free_ref(vlan);
1152
1153                         batadv_tt_local_entry_free_ref(tt_local);
1154                 }
1155                 spin_unlock_bh(list_lock);
1156         }
1157
1158         batadv_hash_destroy(hash);
1159
1160         bat_priv->tt.local_hash = NULL;
1161 }
1162
1163 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1164 {
1165         if (bat_priv->tt.global_hash)
1166                 return 0;
1167
1168         bat_priv->tt.global_hash = batadv_hash_new(1024);
1169
1170         if (!bat_priv->tt.global_hash)
1171                 return -ENOMEM;
1172
1173         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1174                                    &batadv_tt_global_hash_lock_class_key);
1175
1176         return 0;
1177 }
1178
1179 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1180 {
1181         struct batadv_tt_change_node *entry, *safe;
1182
1183         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1184
1185         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1186                                  list) {
1187                 list_del(&entry->list);
1188                 kfree(entry);
1189         }
1190
1191         atomic_set(&bat_priv->tt.local_changes, 0);
1192         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1193 }
1194
1195 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1196  * batadv_tt_global_entry list
1197  *
1198  * returns it with an increased refcounter, NULL if not found
1199  */
1200 static struct batadv_tt_orig_list_entry *
1201 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1202                                  const struct batadv_orig_node *orig_node)
1203 {
1204         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1205         const struct hlist_head *head;
1206
1207         rcu_read_lock();
1208         head = &entry->orig_list;
1209         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1210                 if (tmp_orig_entry->orig_node != orig_node)
1211                         continue;
1212                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1213                         continue;
1214
1215                 orig_entry = tmp_orig_entry;
1216                 break;
1217         }
1218         rcu_read_unlock();
1219
1220         return orig_entry;
1221 }
1222
1223 /* find out if an orig_node is already in the list of a tt_global_entry.
1224  * returns true if found, false otherwise
1225  */
1226 static bool
1227 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1228                                 const struct batadv_orig_node *orig_node)
1229 {
1230         struct batadv_tt_orig_list_entry *orig_entry;
1231         bool found = false;
1232
1233         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1234         if (orig_entry) {
1235                 found = true;
1236                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1237         }
1238
1239         return found;
1240 }
1241
1242 static void
1243 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1244                                 struct batadv_orig_node *orig_node, int ttvn)
1245 {
1246         struct batadv_tt_orig_list_entry *orig_entry;
1247
1248         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1249         if (orig_entry) {
1250                 /* refresh the ttvn: the current value could be a bogus one that
1251                  * was added during a "temporary client detection"
1252                  */
1253                 orig_entry->ttvn = ttvn;
1254                 goto out;
1255         }
1256
1257         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1258         if (!orig_entry)
1259                 goto out;
1260
1261         INIT_HLIST_NODE(&orig_entry->list);
1262         atomic_inc(&orig_node->refcount);
1263         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1264         orig_entry->orig_node = orig_node;
1265         orig_entry->ttvn = ttvn;
1266         atomic_set(&orig_entry->refcount, 2);
1267
1268         spin_lock_bh(&tt_global->list_lock);
1269         hlist_add_head_rcu(&orig_entry->list,
1270                            &tt_global->orig_list);
1271         spin_unlock_bh(&tt_global->list_lock);
1272         atomic_inc(&tt_global->orig_list_count);
1273
1274 out:
1275         if (orig_entry)
1276                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1277 }
1278
1279 /**
1280  * batadv_tt_global_add - add a new TT global entry or update an existing one
1281  * @bat_priv: the bat priv with all the soft interface information
1282  * @orig_node: the originator announcing the client
1283  * @tt_addr: the mac address of the non-mesh client
1284  * @vid: VLAN identifier
1285  * @flags: TT flags that have to be set for this non-mesh client
1286  * @ttvn: the tt version number ever announcing this non-mesh client
1287  *
1288  * Add a new TT global entry for the given originator. If the entry already
1289  * exists add a new reference to the given originator (a global entry can have
1290  * references to multiple originators) and adjust the flags attribute to reflect
1291  * the function argument.
1292  * If a TT local entry exists for this non-mesh client remove it.
1293  *
1294  * The caller must hold orig_node refcount.
1295  *
1296  * Return true if the new entry has been added, false otherwise
1297  */
1298 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1299                                  struct batadv_orig_node *orig_node,
1300                                  const unsigned char *tt_addr,
1301                                  unsigned short vid, uint16_t flags,
1302                                  uint8_t ttvn)
1303 {
1304         struct batadv_tt_global_entry *tt_global_entry;
1305         struct batadv_tt_local_entry *tt_local_entry;
1306         bool ret = false;
1307         int hash_added;
1308         struct batadv_tt_common_entry *common;
1309         uint16_t local_flags;
1310
1311         /* ignore global entries from backbone nodes */
1312         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1313                 return true;
1314
1315         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1316         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1317
1318         /* if the node already has a local client for this entry, it has to wait
1319          * for a roaming advertisement instead of manually messing up the global
1320          * table
1321          */
1322         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1323             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1324                 goto out;
1325
1326         if (!tt_global_entry) {
1327                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1328                 if (!tt_global_entry)
1329                         goto out;
1330
1331                 common = &tt_global_entry->common;
1332                 ether_addr_copy(common->addr, tt_addr);
1333                 common->vid = vid;
1334
1335                 common->flags = flags;
1336                 tt_global_entry->roam_at = 0;
1337                 /* node must store current time in case of roaming. This is
1338                  * needed to purge this entry out on timeout (if nobody claims
1339                  * it)
1340                  */
1341                 if (flags & BATADV_TT_CLIENT_ROAM)
1342                         tt_global_entry->roam_at = jiffies;
1343                 atomic_set(&common->refcount, 2);
1344                 common->added_at = jiffies;
1345
1346                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1347                 atomic_set(&tt_global_entry->orig_list_count, 0);
1348                 spin_lock_init(&tt_global_entry->list_lock);
1349
1350                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1351                                              batadv_compare_tt,
1352                                              batadv_choose_tt, common,
1353                                              &common->hash_entry);
1354
1355                 if (unlikely(hash_added != 0)) {
1356                         /* remove the reference for the hash */
1357                         batadv_tt_global_entry_free_ref(tt_global_entry);
1358                         goto out_remove;
1359                 }
1360         } else {
1361                 common = &tt_global_entry->common;
1362                 /* If there is already a global entry, we can use this one for
1363                  * our processing.
1364                  * But if we are trying to add a temporary client then here are
1365                  * two options at this point:
1366                  * 1) the global client is not a temporary client: the global
1367                  *    client has to be left as it is, temporary information
1368                  *    should never override any already known client state
1369                  * 2) the global client is a temporary client: purge the
1370                  *    originator list and add the new one orig_entry
1371                  */
1372                 if (flags & BATADV_TT_CLIENT_TEMP) {
1373                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1374                                 goto out;
1375                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1376                                                             orig_node))
1377                                 goto out_remove;
1378                         batadv_tt_global_del_orig_list(tt_global_entry);
1379                         goto add_orig_entry;
1380                 }
1381
1382                 /* if the client was temporary added before receiving the first
1383                  * OGM announcing it, we have to clear the TEMP flag
1384                  */
1385                 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1386
1387                 /* the change can carry possible "attribute" flags like the
1388                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1389                  * client entry
1390                  */
1391                 tt_global_entry->common.flags |= flags;
1392
1393                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1394                  * one originator left in the list and we previously received a
1395                  * delete + roaming change for this originator.
1396                  *
1397                  * We should first delete the old originator before adding the
1398                  * new one.
1399                  */
1400                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1401                         batadv_tt_global_del_orig_list(tt_global_entry);
1402                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1403                         tt_global_entry->roam_at = 0;
1404                 }
1405         }
1406 add_orig_entry:
1407         /* add the new orig_entry (if needed) or update it */
1408         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1409
1410         batadv_dbg(BATADV_DBG_TT, bat_priv,
1411                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1412                    common->addr, BATADV_PRINT_VID(common->vid),
1413                    orig_node->orig);
1414         ret = true;
1415
1416 out_remove:
1417         /* Do not remove multicast addresses from the local hash on
1418          * global additions
1419          */
1420         if (is_multicast_ether_addr(tt_addr))
1421                 goto out;
1422
1423         /* remove address from local hash if present */
1424         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1425                                              "global tt received",
1426                                              flags & BATADV_TT_CLIENT_ROAM);
1427         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1428
1429         if (!(flags & BATADV_TT_CLIENT_ROAM))
1430                 /* this is a normal global add. Therefore the client is not in a
1431                  * roaming state anymore.
1432                  */
1433                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1434
1435 out:
1436         if (tt_global_entry)
1437                 batadv_tt_global_entry_free_ref(tt_global_entry);
1438         if (tt_local_entry)
1439                 batadv_tt_local_entry_free_ref(tt_local_entry);
1440         return ret;
1441 }
1442
1443 /**
1444  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1445  * @bat_priv: the bat priv with all the soft interface information
1446  * @tt_global_entry: global translation table entry to be analyzed
1447  *
1448  * This functon assumes the caller holds rcu_read_lock().
1449  * Returns best originator list entry or NULL on errors.
1450  */
1451 static struct batadv_tt_orig_list_entry *
1452 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1453                             struct batadv_tt_global_entry *tt_global_entry)
1454 {
1455         struct batadv_neigh_node *router, *best_router = NULL;
1456         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1457         struct hlist_head *head;
1458         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1459
1460         head = &tt_global_entry->orig_list;
1461         hlist_for_each_entry_rcu(orig_entry, head, list) {
1462                 router = batadv_orig_router_get(orig_entry->orig_node,
1463                                                 BATADV_IF_DEFAULT);
1464                 if (!router)
1465                         continue;
1466
1467                 if (best_router &&
1468                     bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1469                                        best_router, BATADV_IF_DEFAULT) <= 0) {
1470                         batadv_neigh_node_free_ref(router);
1471                         continue;
1472                 }
1473
1474                 /* release the refcount for the "old" best */
1475                 if (best_router)
1476                         batadv_neigh_node_free_ref(best_router);
1477
1478                 best_entry = orig_entry;
1479                 best_router = router;
1480         }
1481
1482         if (best_router)
1483                 batadv_neigh_node_free_ref(best_router);
1484
1485         return best_entry;
1486 }
1487
1488 /**
1489  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1490  *  for this global entry
1491  * @bat_priv: the bat priv with all the soft interface information
1492  * @tt_global_entry: global translation table entry to be printed
1493  * @seq: debugfs table seq_file struct
1494  *
1495  * This functon assumes the caller holds rcu_read_lock().
1496  */
1497 static void
1498 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1499                              struct batadv_tt_global_entry *tt_global_entry,
1500                              struct seq_file *seq)
1501 {
1502         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1503         struct batadv_tt_common_entry *tt_common_entry;
1504         struct batadv_orig_node_vlan *vlan;
1505         struct hlist_head *head;
1506         uint8_t last_ttvn;
1507         uint16_t flags;
1508
1509         tt_common_entry = &tt_global_entry->common;
1510         flags = tt_common_entry->flags;
1511
1512         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1513         if (best_entry) {
1514                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1515                                                  tt_common_entry->vid);
1516                 if (!vlan) {
1517                         seq_printf(seq,
1518                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1519                                    BATADV_PRINT_VID(tt_common_entry->vid),
1520                                    best_entry->orig_node->orig);
1521                         goto print_list;
1522                 }
1523
1524                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1525                 seq_printf(seq,
1526                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1527                            '*', tt_global_entry->common.addr,
1528                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1529                            best_entry->ttvn, best_entry->orig_node->orig,
1530                            last_ttvn, vlan->tt.crc,
1531                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1532                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1533                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1534                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1535
1536                 batadv_orig_node_vlan_free_ref(vlan);
1537         }
1538
1539 print_list:
1540         head = &tt_global_entry->orig_list;
1541
1542         hlist_for_each_entry_rcu(orig_entry, head, list) {
1543                 if (best_entry == orig_entry)
1544                         continue;
1545
1546                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1547                                                  tt_common_entry->vid);
1548                 if (!vlan) {
1549                         seq_printf(seq,
1550                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1551                                    BATADV_PRINT_VID(tt_common_entry->vid),
1552                                    orig_entry->orig_node->orig);
1553                         continue;
1554                 }
1555
1556                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1557                 seq_printf(seq,
1558                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1559                            '+', tt_global_entry->common.addr,
1560                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1561                            orig_entry->ttvn, orig_entry->orig_node->orig,
1562                            last_ttvn, vlan->tt.crc,
1563                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1564                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1565                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1566                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1567
1568                 batadv_orig_node_vlan_free_ref(vlan);
1569         }
1570 }
1571
1572 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1573 {
1574         struct net_device *net_dev = (struct net_device *)seq->private;
1575         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1576         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1577         struct batadv_tt_common_entry *tt_common_entry;
1578         struct batadv_tt_global_entry *tt_global;
1579         struct batadv_hard_iface *primary_if;
1580         struct hlist_head *head;
1581         uint32_t i;
1582
1583         primary_if = batadv_seq_print_text_primary_if_get(seq);
1584         if (!primary_if)
1585                 goto out;
1586
1587         seq_printf(seq,
1588                    "Globally announced TT entries received via the mesh %s\n",
1589                    net_dev->name);
1590         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1591                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1592                    "CRC", "Flags");
1593
1594         for (i = 0; i < hash->size; i++) {
1595                 head = &hash->table[i];
1596
1597                 rcu_read_lock();
1598                 hlist_for_each_entry_rcu(tt_common_entry,
1599                                          head, hash_entry) {
1600                         tt_global = container_of(tt_common_entry,
1601                                                  struct batadv_tt_global_entry,
1602                                                  common);
1603                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1604                 }
1605                 rcu_read_unlock();
1606         }
1607 out:
1608         if (primary_if)
1609                 batadv_hardif_free_ref(primary_if);
1610         return 0;
1611 }
1612
1613 /**
1614  * batadv_tt_global_del_orig_entry - remove and free an orig_entry
1615  * @tt_global_entry: the global entry to remove the orig_entry from
1616  * @orig_entry: the orig entry to remove and free
1617  *
1618  * Remove an orig_entry from its list in the given tt_global_entry and
1619  * free this orig_entry afterwards.
1620  */
1621 static void
1622 batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1623                                 struct batadv_tt_orig_list_entry *orig_entry)
1624 {
1625         batadv_tt_global_size_dec(orig_entry->orig_node,
1626                                   tt_global_entry->common.vid);
1627         atomic_dec(&tt_global_entry->orig_list_count);
1628         hlist_del_rcu(&orig_entry->list);
1629         batadv_tt_orig_list_entry_free_ref(orig_entry);
1630 }
1631
1632 /* deletes the orig list of a tt_global_entry */
1633 static void
1634 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1635 {
1636         struct hlist_head *head;
1637         struct hlist_node *safe;
1638         struct batadv_tt_orig_list_entry *orig_entry;
1639
1640         spin_lock_bh(&tt_global_entry->list_lock);
1641         head = &tt_global_entry->orig_list;
1642         hlist_for_each_entry_safe(orig_entry, safe, head, list)
1643                 batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1644         spin_unlock_bh(&tt_global_entry->list_lock);
1645 }
1646
1647 /**
1648  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1649  * @bat_priv: the bat priv with all the soft interface information
1650  * @tt_global_entry: the global entry to remove the orig_node from
1651  * @orig_node: the originator announcing the client
1652  * @message: message to append to the log on deletion
1653  *
1654  * Remove the given orig_node and its according orig_entry from the given
1655  * global tt entry.
1656  */
1657 static void
1658 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1659                                struct batadv_tt_global_entry *tt_global_entry,
1660                                struct batadv_orig_node *orig_node,
1661                                const char *message)
1662 {
1663         struct hlist_head *head;
1664         struct hlist_node *safe;
1665         struct batadv_tt_orig_list_entry *orig_entry;
1666         unsigned short vid;
1667
1668         spin_lock_bh(&tt_global_entry->list_lock);
1669         head = &tt_global_entry->orig_list;
1670         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1671                 if (orig_entry->orig_node == orig_node) {
1672                         vid = tt_global_entry->common.vid;
1673                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1674                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1675                                    orig_node->orig,
1676                                    tt_global_entry->common.addr,
1677                                    BATADV_PRINT_VID(vid), message);
1678                         batadv_tt_global_del_orig_entry(tt_global_entry,
1679                                                         orig_entry);
1680                 }
1681         }
1682         spin_unlock_bh(&tt_global_entry->list_lock);
1683 }
1684
1685 /* If the client is to be deleted, we check if it is the last origantor entry
1686  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1687  * timer, otherwise we simply remove the originator scheduled for deletion.
1688  */
1689 static void
1690 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1691                              struct batadv_tt_global_entry *tt_global_entry,
1692                              struct batadv_orig_node *orig_node,
1693                              const char *message)
1694 {
1695         bool last_entry = true;
1696         struct hlist_head *head;
1697         struct batadv_tt_orig_list_entry *orig_entry;
1698
1699         /* no local entry exists, case 1:
1700          * Check if this is the last one or if other entries exist.
1701          */
1702
1703         rcu_read_lock();
1704         head = &tt_global_entry->orig_list;
1705         hlist_for_each_entry_rcu(orig_entry, head, list) {
1706                 if (orig_entry->orig_node != orig_node) {
1707                         last_entry = false;
1708                         break;
1709                 }
1710         }
1711         rcu_read_unlock();
1712
1713         if (last_entry) {
1714                 /* its the last one, mark for roaming. */
1715                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1716                 tt_global_entry->roam_at = jiffies;
1717         } else
1718                 /* there is another entry, we can simply delete this
1719                  * one and can still use the other one.
1720                  */
1721                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1722                                                orig_node, message);
1723 }
1724
1725 /**
1726  * batadv_tt_global_del - remove a client from the global table
1727  * @bat_priv: the bat priv with all the soft interface information
1728  * @orig_node: an originator serving this client
1729  * @addr: the mac address of the client
1730  * @vid: VLAN identifier
1731  * @message: a message explaining the reason for deleting the client to print
1732  *  for debugging purpose
1733  * @roaming: true if the deletion has been triggered by a roaming event
1734  */
1735 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1736                                  struct batadv_orig_node *orig_node,
1737                                  const unsigned char *addr, unsigned short vid,
1738                                  const char *message, bool roaming)
1739 {
1740         struct batadv_tt_global_entry *tt_global_entry;
1741         struct batadv_tt_local_entry *local_entry = NULL;
1742
1743         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1744         if (!tt_global_entry)
1745                 goto out;
1746
1747         if (!roaming) {
1748                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1749                                                orig_node, message);
1750
1751                 if (hlist_empty(&tt_global_entry->orig_list))
1752                         batadv_tt_global_free(bat_priv, tt_global_entry,
1753                                               message);
1754
1755                 goto out;
1756         }
1757
1758         /* if we are deleting a global entry due to a roam
1759          * event, there are two possibilities:
1760          * 1) the client roamed from node A to node B => if there
1761          *    is only one originator left for this client, we mark
1762          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1763          *    wait for node B to claim it. In case of timeout
1764          *    the entry is purged.
1765          *
1766          *    If there are other originators left, we directly delete
1767          *    the originator.
1768          * 2) the client roamed to us => we can directly delete
1769          *    the global entry, since it is useless now.
1770          */
1771         local_entry = batadv_tt_local_hash_find(bat_priv,
1772                                                 tt_global_entry->common.addr,
1773                                                 vid);
1774         if (local_entry) {
1775                 /* local entry exists, case 2: client roamed to us. */
1776                 batadv_tt_global_del_orig_list(tt_global_entry);
1777                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1778         } else
1779                 /* no local entry exists, case 1: check for roaming */
1780                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1781                                              orig_node, message);
1782
1783 out:
1784         if (tt_global_entry)
1785                 batadv_tt_global_entry_free_ref(tt_global_entry);
1786         if (local_entry)
1787                 batadv_tt_local_entry_free_ref(local_entry);
1788 }
1789
1790 /**
1791  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1792  *  given originator matching the provided vid
1793  * @bat_priv: the bat priv with all the soft interface information
1794  * @orig_node: the originator owning the entries to remove
1795  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1796  *  removed
1797  * @message: debug message to print as "reason"
1798  */
1799 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1800                                struct batadv_orig_node *orig_node,
1801                                int32_t match_vid,
1802                                const char *message)
1803 {
1804         struct batadv_tt_global_entry *tt_global;
1805         struct batadv_tt_common_entry *tt_common_entry;
1806         uint32_t i;
1807         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1808         struct hlist_node *safe;
1809         struct hlist_head *head;
1810         spinlock_t *list_lock; /* protects write access to the hash lists */
1811         unsigned short vid;
1812
1813         if (!hash)
1814                 return;
1815
1816         for (i = 0; i < hash->size; i++) {
1817                 head = &hash->table[i];
1818                 list_lock = &hash->list_locks[i];
1819
1820                 spin_lock_bh(list_lock);
1821                 hlist_for_each_entry_safe(tt_common_entry, safe,
1822                                           head, hash_entry) {
1823                         /* remove only matching entries */
1824                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1825                                 continue;
1826
1827                         tt_global = container_of(tt_common_entry,
1828                                                  struct batadv_tt_global_entry,
1829                                                  common);
1830
1831                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
1832                                                        orig_node, message);
1833
1834                         if (hlist_empty(&tt_global->orig_list)) {
1835                                 vid = tt_global->common.vid;
1836                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1837                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1838                                            tt_global->common.addr,
1839                                            BATADV_PRINT_VID(vid), message);
1840                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1841                                 batadv_tt_global_entry_free_ref(tt_global);
1842                         }
1843                 }
1844                 spin_unlock_bh(list_lock);
1845         }
1846         orig_node->capa_initialized &= ~BATADV_ORIG_CAPA_HAS_TT;
1847 }
1848
1849 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1850                                       char **msg)
1851 {
1852         bool purge = false;
1853         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1854         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1855
1856         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1857             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1858                 purge = true;
1859                 *msg = "Roaming timeout\n";
1860         }
1861
1862         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1863             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1864                 purge = true;
1865                 *msg = "Temporary client timeout\n";
1866         }
1867
1868         return purge;
1869 }
1870
1871 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1872 {
1873         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1874         struct hlist_head *head;
1875         struct hlist_node *node_tmp;
1876         spinlock_t *list_lock; /* protects write access to the hash lists */
1877         uint32_t i;
1878         char *msg = NULL;
1879         struct batadv_tt_common_entry *tt_common;
1880         struct batadv_tt_global_entry *tt_global;
1881
1882         for (i = 0; i < hash->size; i++) {
1883                 head = &hash->table[i];
1884                 list_lock = &hash->list_locks[i];
1885
1886                 spin_lock_bh(list_lock);
1887                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1888                                           hash_entry) {
1889                         tt_global = container_of(tt_common,
1890                                                  struct batadv_tt_global_entry,
1891                                                  common);
1892
1893                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1894                                 continue;
1895
1896                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1897                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1898                                    tt_global->common.addr,
1899                                    BATADV_PRINT_VID(tt_global->common.vid),
1900                                    msg);
1901
1902                         hlist_del_rcu(&tt_common->hash_entry);
1903
1904                         batadv_tt_global_entry_free_ref(tt_global);
1905                 }
1906                 spin_unlock_bh(list_lock);
1907         }
1908 }
1909
1910 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1911 {
1912         struct batadv_hashtable *hash;
1913         spinlock_t *list_lock; /* protects write access to the hash lists */
1914         struct batadv_tt_common_entry *tt_common_entry;
1915         struct batadv_tt_global_entry *tt_global;
1916         struct hlist_node *node_tmp;
1917         struct hlist_head *head;
1918         uint32_t i;
1919
1920         if (!bat_priv->tt.global_hash)
1921                 return;
1922
1923         hash = bat_priv->tt.global_hash;
1924
1925         for (i = 0; i < hash->size; i++) {
1926                 head = &hash->table[i];
1927                 list_lock = &hash->list_locks[i];
1928
1929                 spin_lock_bh(list_lock);
1930                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1931                                           head, hash_entry) {
1932                         hlist_del_rcu(&tt_common_entry->hash_entry);
1933                         tt_global = container_of(tt_common_entry,
1934                                                  struct batadv_tt_global_entry,
1935                                                  common);
1936                         batadv_tt_global_entry_free_ref(tt_global);
1937                 }
1938                 spin_unlock_bh(list_lock);
1939         }
1940
1941         batadv_hash_destroy(hash);
1942
1943         bat_priv->tt.global_hash = NULL;
1944 }
1945
1946 static bool
1947 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1948                        struct batadv_tt_global_entry *tt_global_entry)
1949 {
1950         bool ret = false;
1951
1952         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1953             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1954                 ret = true;
1955
1956         /* check if the two clients are marked as isolated */
1957         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
1958             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
1959                 ret = true;
1960
1961         return ret;
1962 }
1963
1964 /**
1965  * batadv_transtable_search - get the mesh destination for a given client
1966  * @bat_priv: the bat priv with all the soft interface information
1967  * @src: mac address of the source client
1968  * @addr: mac address of the destination client
1969  * @vid: VLAN identifier
1970  *
1971  * Returns a pointer to the originator that was selected as destination in the
1972  * mesh for contacting the client 'addr', NULL otherwise.
1973  * In case of multiple originators serving the same client, the function returns
1974  * the best one (best in terms of metric towards the destination node).
1975  *
1976  * If the two clients are AP isolated the function returns NULL.
1977  */
1978 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1979                                                   const uint8_t *src,
1980                                                   const uint8_t *addr,
1981                                                   unsigned short vid)
1982 {
1983         struct batadv_tt_local_entry *tt_local_entry = NULL;
1984         struct batadv_tt_global_entry *tt_global_entry = NULL;
1985         struct batadv_orig_node *orig_node = NULL;
1986         struct batadv_tt_orig_list_entry *best_entry;
1987
1988         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
1989                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1990                 if (!tt_local_entry ||
1991                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1992                         goto out;
1993         }
1994
1995         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1996         if (!tt_global_entry)
1997                 goto out;
1998
1999         /* check whether the clients should not communicate due to AP
2000          * isolation
2001          */
2002         if (tt_local_entry &&
2003             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2004                 goto out;
2005
2006         rcu_read_lock();
2007         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2008         /* found anything? */
2009         if (best_entry)
2010                 orig_node = best_entry->orig_node;
2011         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2012                 orig_node = NULL;
2013         rcu_read_unlock();
2014
2015 out:
2016         if (tt_global_entry)
2017                 batadv_tt_global_entry_free_ref(tt_global_entry);
2018         if (tt_local_entry)
2019                 batadv_tt_local_entry_free_ref(tt_local_entry);
2020
2021         return orig_node;
2022 }
2023
2024 /**
2025  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2026  *  to the given orig_node
2027  * @bat_priv: the bat priv with all the soft interface information
2028  * @orig_node: originator for which the CRC should be computed
2029  * @vid: VLAN identifier for which the CRC32 has to be computed
2030  *
2031  * This function computes the checksum for the global table corresponding to a
2032  * specific originator. In particular, the checksum is computed as follows: For
2033  * each client connected to the originator the CRC32C of the MAC address and the
2034  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2035  * together.
2036  *
2037  * The idea behind is that CRC32C should be used as much as possible in order to
2038  * produce a unique hash of the table, but since the order which is used to feed
2039  * the CRC32C function affects the result and since every node in the network
2040  * probably sorts the clients differently, the hash function cannot be directly
2041  * computed over the entire table. Hence the CRC32C is used only on
2042  * the single client entry, while all the results are then xor'ed together
2043  * because the XOR operation can combine them all while trying to reduce the
2044  * noise as much as possible.
2045  *
2046  * Returns the checksum of the global table of a given originator.
2047  */
2048 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
2049                                      struct batadv_orig_node *orig_node,
2050                                      unsigned short vid)
2051 {
2052         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2053         struct batadv_tt_common_entry *tt_common;
2054         struct batadv_tt_global_entry *tt_global;
2055         struct hlist_head *head;
2056         uint32_t i, crc_tmp, crc = 0;
2057         uint8_t flags;
2058         __be16 tmp_vid;
2059
2060         for (i = 0; i < hash->size; i++) {
2061                 head = &hash->table[i];
2062
2063                 rcu_read_lock();
2064                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2065                         tt_global = container_of(tt_common,
2066                                                  struct batadv_tt_global_entry,
2067                                                  common);
2068                         /* compute the CRC only for entries belonging to the
2069                          * VLAN identified by the vid passed as parameter
2070                          */
2071                         if (tt_common->vid != vid)
2072                                 continue;
2073
2074                         /* Roaming clients are in the global table for
2075                          * consistency only. They don't have to be
2076                          * taken into account while computing the
2077                          * global crc
2078                          */
2079                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2080                                 continue;
2081                         /* Temporary clients have not been announced yet, so
2082                          * they have to be skipped while computing the global
2083                          * crc
2084                          */
2085                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2086                                 continue;
2087
2088                         /* find out if this global entry is announced by this
2089                          * originator
2090                          */
2091                         if (!batadv_tt_global_entry_has_orig(tt_global,
2092                                                              orig_node))
2093                                 continue;
2094
2095                         /* use network order to read the VID: this ensures that
2096                          * every node reads the bytes in the same order.
2097                          */
2098                         tmp_vid = htons(tt_common->vid);
2099                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2100
2101                         /* compute the CRC on flags that have to be kept in sync
2102                          * among nodes
2103                          */
2104                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2105                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2106
2107                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2108                 }
2109                 rcu_read_unlock();
2110         }
2111
2112         return crc;
2113 }
2114
2115 /**
2116  * batadv_tt_local_crc - calculates the checksum of the local table
2117  * @bat_priv: the bat priv with all the soft interface information
2118  * @vid: VLAN identifier for which the CRC32 has to be computed
2119  *
2120  * For details about the computation, please refer to the documentation for
2121  * batadv_tt_global_crc().
2122  *
2123  * Returns the checksum of the local table
2124  */
2125 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2126                                     unsigned short vid)
2127 {
2128         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2129         struct batadv_tt_common_entry *tt_common;
2130         struct hlist_head *head;
2131         uint32_t i, crc_tmp, crc = 0;
2132         uint8_t flags;
2133         __be16 tmp_vid;
2134
2135         for (i = 0; i < hash->size; i++) {
2136                 head = &hash->table[i];
2137
2138                 rcu_read_lock();
2139                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2140                         /* compute the CRC only for entries belonging to the
2141                          * VLAN identified by vid
2142                          */
2143                         if (tt_common->vid != vid)
2144                                 continue;
2145
2146                         /* not yet committed clients have not to be taken into
2147                          * account while computing the CRC
2148                          */
2149                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2150                                 continue;
2151
2152                         /* use network order to read the VID: this ensures that
2153                          * every node reads the bytes in the same order.
2154                          */
2155                         tmp_vid = htons(tt_common->vid);
2156                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2157
2158                         /* compute the CRC on flags that have to be kept in sync
2159                          * among nodes
2160                          */
2161                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2162                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2163
2164                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2165                 }
2166                 rcu_read_unlock();
2167         }
2168
2169         return crc;
2170 }
2171
2172 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2173 {
2174         struct batadv_tt_req_node *node, *safe;
2175
2176         spin_lock_bh(&bat_priv->tt.req_list_lock);
2177
2178         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2179                 list_del(&node->list);
2180                 kfree(node);
2181         }
2182
2183         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2184 }
2185
2186 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2187                                        struct batadv_orig_node *orig_node,
2188                                        const void *tt_buff,
2189                                        uint16_t tt_buff_len)
2190 {
2191         /* Replace the old buffer only if I received something in the
2192          * last OGM (the OGM could carry no changes)
2193          */
2194         spin_lock_bh(&orig_node->tt_buff_lock);
2195         if (tt_buff_len > 0) {
2196                 kfree(orig_node->tt_buff);
2197                 orig_node->tt_buff_len = 0;
2198                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2199                 if (orig_node->tt_buff) {
2200                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2201                         orig_node->tt_buff_len = tt_buff_len;
2202                 }
2203         }
2204         spin_unlock_bh(&orig_node->tt_buff_lock);
2205 }
2206
2207 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2208 {
2209         struct batadv_tt_req_node *node, *safe;
2210
2211         spin_lock_bh(&bat_priv->tt.req_list_lock);
2212         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2213                 if (batadv_has_timed_out(node->issued_at,
2214                                          BATADV_TT_REQUEST_TIMEOUT)) {
2215                         list_del(&node->list);
2216                         kfree(node);
2217                 }
2218         }
2219         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2220 }
2221
2222 /* returns the pointer to the new tt_req_node struct if no request
2223  * has already been issued for this orig_node, NULL otherwise
2224  */
2225 static struct batadv_tt_req_node *
2226 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2227                        struct batadv_orig_node *orig_node)
2228 {
2229         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2230
2231         spin_lock_bh(&bat_priv->tt.req_list_lock);
2232         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2233                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2234                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2235                                           BATADV_TT_REQUEST_TIMEOUT))
2236                         goto unlock;
2237         }
2238
2239         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2240         if (!tt_req_node)
2241                 goto unlock;
2242
2243         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2244         tt_req_node->issued_at = jiffies;
2245
2246         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2247 unlock:
2248         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2249         return tt_req_node;
2250 }
2251
2252 /**
2253  * batadv_tt_local_valid - verify that given tt entry is a valid one
2254  * @entry_ptr: to be checked local tt entry
2255  * @data_ptr: not used but definition required to satisfy the callback prototype
2256  *
2257  * Returns 1 if the entry is a valid, 0 otherwise.
2258  */
2259 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2260 {
2261         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2262
2263         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2264                 return 0;
2265         return 1;
2266 }
2267
2268 static int batadv_tt_global_valid(const void *entry_ptr,
2269                                   const void *data_ptr)
2270 {
2271         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2272         const struct batadv_tt_global_entry *tt_global_entry;
2273         const struct batadv_orig_node *orig_node = data_ptr;
2274
2275         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2276             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2277                 return 0;
2278
2279         tt_global_entry = container_of(tt_common_entry,
2280                                        struct batadv_tt_global_entry,
2281                                        common);
2282
2283         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2284 }
2285
2286 /**
2287  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2288  *  specified tt hash
2289  * @bat_priv: the bat priv with all the soft interface information
2290  * @hash: hash table containing the tt entries
2291  * @tt_len: expected tvlv tt data buffer length in number of bytes
2292  * @tvlv_buff: pointer to the buffer to fill with the TT data
2293  * @valid_cb: function to filter tt change entries
2294  * @cb_data: data passed to the filter function as argument
2295  */
2296 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2297                                     struct batadv_hashtable *hash,
2298                                     void *tvlv_buff, uint16_t tt_len,
2299                                     int (*valid_cb)(const void *, const void *),
2300                                     void *cb_data)
2301 {
2302         struct batadv_tt_common_entry *tt_common_entry;
2303         struct batadv_tvlv_tt_change *tt_change;
2304         struct hlist_head *head;
2305         uint16_t tt_tot, tt_num_entries = 0;
2306         uint32_t i;
2307
2308         tt_tot = batadv_tt_entries(tt_len);
2309         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2310
2311         rcu_read_lock();
2312         for (i = 0; i < hash->size; i++) {
2313                 head = &hash->table[i];
2314
2315                 hlist_for_each_entry_rcu(tt_common_entry,
2316                                          head, hash_entry) {
2317                         if (tt_tot == tt_num_entries)
2318                                 break;
2319
2320                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2321                                 continue;
2322
2323                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2324                         tt_change->flags = tt_common_entry->flags;
2325                         tt_change->vid = htons(tt_common_entry->vid);
2326                         memset(tt_change->reserved, 0,
2327                                sizeof(tt_change->reserved));
2328
2329                         tt_num_entries++;
2330                         tt_change++;
2331                 }
2332         }
2333         rcu_read_unlock();
2334 }
2335
2336 /**
2337  * batadv_tt_global_check_crc - check if all the CRCs are correct
2338  * @orig_node: originator for which the CRCs have to be checked
2339  * @tt_vlan: pointer to the first tvlv VLAN entry
2340  * @num_vlan: number of tvlv VLAN entries
2341  * @create: if true, create VLAN objects if not found
2342  *
2343  * Return true if all the received CRCs match the locally stored ones, false
2344  * otherwise
2345  */
2346 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2347                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2348                                        uint16_t num_vlan)
2349 {
2350         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2351         struct batadv_orig_node_vlan *vlan;
2352         uint32_t crc;
2353         int i;
2354
2355         /* check if each received CRC matches the locally stored one */
2356         for (i = 0; i < num_vlan; i++) {
2357                 tt_vlan_tmp = tt_vlan + i;
2358
2359                 /* if orig_node is a backbone node for this VLAN, don't check
2360                  * the CRC as we ignore all the global entries over it
2361                  */
2362                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2363                                                    orig_node->orig,
2364                                                    ntohs(tt_vlan_tmp->vid)))
2365                         continue;
2366
2367                 vlan = batadv_orig_node_vlan_get(orig_node,
2368                                                  ntohs(tt_vlan_tmp->vid));
2369                 if (!vlan)
2370                         return false;
2371
2372                 crc = vlan->tt.crc;
2373                 batadv_orig_node_vlan_free_ref(vlan);
2374
2375                 if (crc != ntohl(tt_vlan_tmp->crc))
2376                         return false;
2377         }
2378
2379         return true;
2380 }
2381
2382 /**
2383  * batadv_tt_local_update_crc - update all the local CRCs
2384  * @bat_priv: the bat priv with all the soft interface information
2385  */
2386 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2387 {
2388         struct batadv_softif_vlan *vlan;
2389
2390         /* recompute the global CRC for each VLAN */
2391         rcu_read_lock();
2392         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2393                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2394         }
2395         rcu_read_unlock();
2396 }
2397
2398 /**
2399  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2400  * @bat_priv: the bat priv with all the soft interface information
2401  * @orig_node: the orig_node for which the CRCs have to be updated
2402  */
2403 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2404                                         struct batadv_orig_node *orig_node)
2405 {
2406         struct batadv_orig_node_vlan *vlan;
2407         uint32_t crc;
2408
2409         /* recompute the global CRC for each VLAN */
2410         rcu_read_lock();
2411         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2412                 /* if orig_node is a backbone node for this VLAN, don't compute
2413                  * the CRC as we ignore all the global entries over it
2414                  */
2415                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2416                                                    vlan->vid))
2417                         continue;
2418
2419                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2420                 vlan->tt.crc = crc;
2421         }
2422         rcu_read_unlock();
2423 }
2424
2425 /**
2426  * batadv_send_tt_request - send a TT Request message to a given node
2427  * @bat_priv: the bat priv with all the soft interface information
2428  * @dst_orig_node: the destination of the message
2429  * @ttvn: the version number that the source of the message is looking for
2430  * @tt_vlan: pointer to the first tvlv VLAN object to request
2431  * @num_vlan: number of tvlv VLAN entries
2432  * @full_table: ask for the entire translation table if true, while only for the
2433  *  last TT diff otherwise
2434  */
2435 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2436                                   struct batadv_orig_node *dst_orig_node,
2437                                   uint8_t ttvn,
2438                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2439                                   uint16_t num_vlan, bool full_table)
2440 {
2441         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2442         struct batadv_tt_req_node *tt_req_node = NULL;
2443         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2444         struct batadv_hard_iface *primary_if;
2445         bool ret = false;
2446         int i, size;
2447
2448         primary_if = batadv_primary_if_get_selected(bat_priv);
2449         if (!primary_if)
2450                 goto out;
2451
2452         /* The new tt_req will be issued only if I'm not waiting for a
2453          * reply from the same orig_node yet
2454          */
2455         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2456         if (!tt_req_node)
2457                 goto out;
2458
2459         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2460         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2461         if (!tvlv_tt_data)
2462                 goto out;
2463
2464         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2465         tvlv_tt_data->ttvn = ttvn;
2466         tvlv_tt_data->num_vlan = htons(num_vlan);
2467
2468         /* send all the CRCs within the request. This is needed by intermediate
2469          * nodes to ensure they have the correct table before replying
2470          */
2471         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2472         for (i = 0; i < num_vlan; i++) {
2473                 tt_vlan_req->vid = tt_vlan->vid;
2474                 tt_vlan_req->crc = tt_vlan->crc;
2475
2476                 tt_vlan_req++;
2477                 tt_vlan++;
2478         }
2479
2480         if (full_table)
2481                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2482
2483         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2484                    dst_orig_node->orig, full_table ? 'F' : '.');
2485
2486         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2487         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2488                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2489                                  tvlv_tt_data, size);
2490         ret = true;
2491
2492 out:
2493         if (primary_if)
2494                 batadv_hardif_free_ref(primary_if);
2495         if (ret && tt_req_node) {
2496                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2497                 list_del(&tt_req_node->list);
2498                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2499                 kfree(tt_req_node);
2500         }
2501         kfree(tvlv_tt_data);
2502         return ret;
2503 }
2504
2505 /**
2506  * batadv_send_other_tt_response - send reply to tt request concerning another
2507  *  node's translation table
2508  * @bat_priv: the bat priv with all the soft interface information
2509  * @tt_data: tt data containing the tt request information
2510  * @req_src: mac address of tt request sender
2511  * @req_dst: mac address of tt request recipient
2512  *
2513  * Returns true if tt request reply was sent, false otherwise.
2514  */
2515 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2516                                           struct batadv_tvlv_tt_data *tt_data,
2517                                           uint8_t *req_src, uint8_t *req_dst)
2518 {
2519         struct batadv_orig_node *req_dst_orig_node;
2520         struct batadv_orig_node *res_dst_orig_node = NULL;
2521         struct batadv_tvlv_tt_change *tt_change;
2522         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2523         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2524         bool ret = false, full_table;
2525         uint8_t orig_ttvn, req_ttvn;
2526         uint16_t tvlv_len;
2527         int32_t tt_len;
2528
2529         batadv_dbg(BATADV_DBG_TT, bat_priv,
2530                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2531                    req_src, tt_data->ttvn, req_dst,
2532                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2533
2534         /* Let's get the orig node of the REAL destination */
2535         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2536         if (!req_dst_orig_node)
2537                 goto out;
2538
2539         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2540         if (!res_dst_orig_node)
2541                 goto out;
2542
2543         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2544         req_ttvn = tt_data->ttvn;
2545
2546         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2547         /* this node doesn't have the requested data */
2548         if (orig_ttvn != req_ttvn ||
2549             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2550                                         ntohs(tt_data->num_vlan)))
2551                 goto out;
2552
2553         /* If the full table has been explicitly requested */
2554         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2555             !req_dst_orig_node->tt_buff)
2556                 full_table = true;
2557         else
2558                 full_table = false;
2559
2560         /* TT fragmentation hasn't been implemented yet, so send as many
2561          * TT entries fit a single packet as possible only
2562          */
2563         if (!full_table) {
2564                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2565                 tt_len = req_dst_orig_node->tt_buff_len;
2566
2567                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2568                                                               &tvlv_tt_data,
2569                                                               &tt_change,
2570                                                               &tt_len);
2571                 if (!tt_len)
2572                         goto unlock;
2573
2574                 /* Copy the last orig_node's OGM buffer */
2575                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2576                        req_dst_orig_node->tt_buff_len);
2577                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2578         } else {
2579                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2580                  * in the initial part
2581                  */
2582                 tt_len = -1;
2583                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2584                                                               &tvlv_tt_data,
2585                                                               &tt_change,
2586                                                               &tt_len);
2587                 if (!tt_len)
2588                         goto out;
2589
2590                 /* fill the rest of the tvlv with the real TT entries */
2591                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2592                                         tt_change, tt_len,
2593                                         batadv_tt_global_valid,
2594                                         req_dst_orig_node);
2595         }
2596
2597         /* Don't send the response, if larger than fragmented packet. */
2598         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2599         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2600                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2601                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2602                                          res_dst_orig_node->orig);
2603                 goto out;
2604         }
2605
2606         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2607         tvlv_tt_data->ttvn = req_ttvn;
2608
2609         if (full_table)
2610                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2611
2612         batadv_dbg(BATADV_DBG_TT, bat_priv,
2613                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2614                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2615                    full_table ? 'F' : '.', req_ttvn);
2616
2617         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2618
2619         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2620                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2621                                  tvlv_len);
2622
2623         ret = true;
2624         goto out;
2625
2626 unlock:
2627         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2628
2629 out:
2630         if (res_dst_orig_node)
2631                 batadv_orig_node_free_ref(res_dst_orig_node);
2632         if (req_dst_orig_node)
2633                 batadv_orig_node_free_ref(req_dst_orig_node);
2634         kfree(tvlv_tt_data);
2635         return ret;
2636 }
2637
2638 /**
2639  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2640  *  translation table
2641  * @bat_priv: the bat priv with all the soft interface information
2642  * @tt_data: tt data containing the tt request information
2643  * @req_src: mac address of tt request sender
2644  *
2645  * Returns true if tt request reply was sent, false otherwise.
2646  */
2647 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2648                                        struct batadv_tvlv_tt_data *tt_data,
2649                                        uint8_t *req_src)
2650 {
2651         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2652         struct batadv_hard_iface *primary_if = NULL;
2653         struct batadv_tvlv_tt_change *tt_change;
2654         struct batadv_orig_node *orig_node;
2655         uint8_t my_ttvn, req_ttvn;
2656         uint16_t tvlv_len;
2657         bool full_table;
2658         int32_t tt_len;
2659
2660         batadv_dbg(BATADV_DBG_TT, bat_priv,
2661                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2662                    req_src, tt_data->ttvn,
2663                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2664
2665         spin_lock_bh(&bat_priv->tt.commit_lock);
2666
2667         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2668         req_ttvn = tt_data->ttvn;
2669
2670         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2671         if (!orig_node)
2672                 goto out;
2673
2674         primary_if = batadv_primary_if_get_selected(bat_priv);
2675         if (!primary_if)
2676                 goto out;
2677
2678         /* If the full table has been explicitly requested or the gap
2679          * is too big send the whole local translation table
2680          */
2681         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2682             !bat_priv->tt.last_changeset)
2683                 full_table = true;
2684         else
2685                 full_table = false;
2686
2687         /* TT fragmentation hasn't been implemented yet, so send as many
2688          * TT entries fit a single packet as possible only
2689          */
2690         if (!full_table) {
2691                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2692
2693                 tt_len = bat_priv->tt.last_changeset_len;
2694                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2695                                                              &tvlv_tt_data,
2696                                                              &tt_change,
2697                                                              &tt_len);
2698                 if (!tt_len)
2699                         goto unlock;
2700
2701                 /* Copy the last orig_node's OGM buffer */
2702                 memcpy(tt_change, bat_priv->tt.last_changeset,
2703                        bat_priv->tt.last_changeset_len);
2704                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2705         } else {
2706                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2707
2708                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2709                  * in the initial part
2710                  */
2711                 tt_len = -1;
2712                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2713                                                              &tvlv_tt_data,
2714                                                              &tt_change,
2715                                                              &tt_len);
2716                 if (!tt_len)
2717                         goto out;
2718
2719                 /* fill the rest of the tvlv with the real TT entries */
2720                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2721                                         tt_change, tt_len,
2722                                         batadv_tt_local_valid, NULL);
2723         }
2724
2725         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2726         tvlv_tt_data->ttvn = req_ttvn;
2727
2728         if (full_table)
2729                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2730
2731         batadv_dbg(BATADV_DBG_TT, bat_priv,
2732                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2733                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2734
2735         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2736
2737         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2738                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2739                                  tvlv_len);
2740
2741         goto out;
2742
2743 unlock:
2744         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2745 out:
2746         spin_unlock_bh(&bat_priv->tt.commit_lock);
2747         if (orig_node)
2748                 batadv_orig_node_free_ref(orig_node);
2749         if (primary_if)
2750                 batadv_hardif_free_ref(primary_if);
2751         kfree(tvlv_tt_data);
2752         /* The packet was for this host, so it doesn't need to be re-routed */
2753         return true;
2754 }
2755
2756 /**
2757  * batadv_send_tt_response - send reply to tt request
2758  * @bat_priv: the bat priv with all the soft interface information
2759  * @tt_data: tt data containing the tt request information
2760  * @req_src: mac address of tt request sender
2761  * @req_dst: mac address of tt request recipient
2762  *
2763  * Returns true if tt request reply was sent, false otherwise.
2764  */
2765 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2766                                     struct batadv_tvlv_tt_data *tt_data,
2767                                     uint8_t *req_src, uint8_t *req_dst)
2768 {
2769         if (batadv_is_my_mac(bat_priv, req_dst))
2770                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2771         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2772                                              req_dst);
2773 }
2774
2775 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2776                                       struct batadv_orig_node *orig_node,
2777                                       struct batadv_tvlv_tt_change *tt_change,
2778                                       uint16_t tt_num_changes, uint8_t ttvn)
2779 {
2780         int i;
2781         int roams;
2782
2783         for (i = 0; i < tt_num_changes; i++) {
2784                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2785                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2786                         batadv_tt_global_del(bat_priv, orig_node,
2787                                              (tt_change + i)->addr,
2788                                              ntohs((tt_change + i)->vid),
2789                                              "tt removed by changes",
2790                                              roams);
2791                 } else {
2792                         if (!batadv_tt_global_add(bat_priv, orig_node,
2793                                                   (tt_change + i)->addr,
2794                                                   ntohs((tt_change + i)->vid),
2795                                                   (tt_change + i)->flags, ttvn))
2796                                 /* In case of problem while storing a
2797                                  * global_entry, we stop the updating
2798                                  * procedure without committing the
2799                                  * ttvn change. This will avoid to send
2800                                  * corrupted data on tt_request
2801                                  */
2802                                 return;
2803                 }
2804         }
2805         orig_node->capa_initialized |= BATADV_ORIG_CAPA_HAS_TT;
2806 }
2807
2808 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2809                                   struct batadv_tvlv_tt_change *tt_change,
2810                                   uint8_t ttvn, uint8_t *resp_src,
2811                                   uint16_t num_entries)
2812 {
2813         struct batadv_orig_node *orig_node;
2814
2815         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2816         if (!orig_node)
2817                 goto out;
2818
2819         /* Purge the old table first.. */
2820         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2821                                   "Received full table");
2822
2823         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2824                                   ttvn);
2825
2826         spin_lock_bh(&orig_node->tt_buff_lock);
2827         kfree(orig_node->tt_buff);
2828         orig_node->tt_buff_len = 0;
2829         orig_node->tt_buff = NULL;
2830         spin_unlock_bh(&orig_node->tt_buff_lock);
2831
2832         atomic_set(&orig_node->last_ttvn, ttvn);
2833
2834 out:
2835         if (orig_node)
2836                 batadv_orig_node_free_ref(orig_node);
2837 }
2838
2839 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2840                                      struct batadv_orig_node *orig_node,
2841                                      uint16_t tt_num_changes, uint8_t ttvn,
2842                                      struct batadv_tvlv_tt_change *tt_change)
2843 {
2844         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2845                                   tt_num_changes, ttvn);
2846
2847         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2848                                    batadv_tt_len(tt_num_changes));
2849         atomic_set(&orig_node->last_ttvn, ttvn);
2850 }
2851
2852 /**
2853  * batadv_is_my_client - check if a client is served by the local node
2854  * @bat_priv: the bat priv with all the soft interface information
2855  * @addr: the mac address of the client to check
2856  * @vid: VLAN identifier
2857  *
2858  * Returns true if the client is served by this node, false otherwise.
2859  */
2860 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2861                          unsigned short vid)
2862 {
2863         struct batadv_tt_local_entry *tt_local_entry;
2864         bool ret = false;
2865
2866         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2867         if (!tt_local_entry)
2868                 goto out;
2869         /* Check if the client has been logically deleted (but is kept for
2870          * consistency purpose)
2871          */
2872         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2873             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2874                 goto out;
2875         ret = true;
2876 out:
2877         if (tt_local_entry)
2878                 batadv_tt_local_entry_free_ref(tt_local_entry);
2879         return ret;
2880 }
2881
2882 /**
2883  * batadv_handle_tt_response - process incoming tt reply
2884  * @bat_priv: the bat priv with all the soft interface information
2885  * @tt_data: tt data containing the tt request information
2886  * @resp_src: mac address of tt reply sender
2887  * @num_entries: number of tt change entries appended to the tt data
2888  */
2889 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2890                                       struct batadv_tvlv_tt_data *tt_data,
2891                                       uint8_t *resp_src, uint16_t num_entries)
2892 {
2893         struct batadv_tt_req_node *node, *safe;
2894         struct batadv_orig_node *orig_node = NULL;
2895         struct batadv_tvlv_tt_change *tt_change;
2896         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2897         uint16_t change_offset;
2898
2899         batadv_dbg(BATADV_DBG_TT, bat_priv,
2900                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2901                    resp_src, tt_data->ttvn, num_entries,
2902                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2903
2904         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2905         if (!orig_node)
2906                 goto out;
2907
2908         spin_lock_bh(&orig_node->tt_lock);
2909
2910         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2911         change_offset *= ntohs(tt_data->num_vlan);
2912         change_offset += sizeof(*tt_data);
2913         tvlv_ptr += change_offset;
2914
2915         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2916         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2917                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2918                                       resp_src, num_entries);
2919         } else {
2920                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2921                                          tt_data->ttvn, tt_change);
2922         }
2923
2924         /* Recalculate the CRC for this orig_node and store it */
2925         batadv_tt_global_update_crc(bat_priv, orig_node);
2926
2927         spin_unlock_bh(&orig_node->tt_lock);
2928
2929         /* Delete the tt_req_node from pending tt_requests list */
2930         spin_lock_bh(&bat_priv->tt.req_list_lock);
2931         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2932                 if (!batadv_compare_eth(node->addr, resp_src))
2933                         continue;
2934                 list_del(&node->list);
2935                 kfree(node);
2936         }
2937
2938         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2939 out:
2940         if (orig_node)
2941                 batadv_orig_node_free_ref(orig_node);
2942 }
2943
2944 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2945 {
2946         struct batadv_tt_roam_node *node, *safe;
2947
2948         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2949
2950         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2951                 list_del(&node->list);
2952                 kfree(node);
2953         }
2954
2955         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2956 }
2957
2958 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2959 {
2960         struct batadv_tt_roam_node *node, *safe;
2961
2962         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2963         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2964                 if (!batadv_has_timed_out(node->first_time,
2965                                           BATADV_ROAMING_MAX_TIME))
2966                         continue;
2967
2968                 list_del(&node->list);
2969                 kfree(node);
2970         }
2971         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2972 }
2973
2974 /* This function checks whether the client already reached the
2975  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2976  * will not be sent.
2977  *
2978  * returns true if the ROAMING_ADV can be sent, false otherwise
2979  */
2980 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2981                                        uint8_t *client)
2982 {
2983         struct batadv_tt_roam_node *tt_roam_node;
2984         bool ret = false;
2985
2986         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2987         /* The new tt_req will be issued only if I'm not waiting for a
2988          * reply from the same orig_node yet
2989          */
2990         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2991                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2992                         continue;
2993
2994                 if (batadv_has_timed_out(tt_roam_node->first_time,
2995                                          BATADV_ROAMING_MAX_TIME))
2996                         continue;
2997
2998                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2999                         /* Sorry, you roamed too many times! */
3000                         goto unlock;
3001                 ret = true;
3002                 break;
3003         }
3004
3005         if (!ret) {
3006                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3007                 if (!tt_roam_node)
3008                         goto unlock;
3009
3010                 tt_roam_node->first_time = jiffies;
3011                 atomic_set(&tt_roam_node->counter,
3012                            BATADV_ROAMING_MAX_COUNT - 1);
3013                 ether_addr_copy(tt_roam_node->addr, client);
3014
3015                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3016                 ret = true;
3017         }
3018
3019 unlock:
3020         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3021         return ret;
3022 }
3023
3024 /**
3025  * batadv_send_roam_adv - send a roaming advertisement message
3026  * @bat_priv: the bat priv with all the soft interface information
3027  * @client: mac address of the roaming client
3028  * @vid: VLAN identifier
3029  * @orig_node: message destination
3030  *
3031  * Send a ROAMING_ADV message to the node which was previously serving this
3032  * client. This is done to inform the node that from now on all traffic destined
3033  * for this particular roamed client has to be forwarded to the sender of the
3034  * roaming message.
3035  */
3036 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
3037                                  unsigned short vid,
3038                                  struct batadv_orig_node *orig_node)
3039 {
3040         struct batadv_hard_iface *primary_if;
3041         struct batadv_tvlv_roam_adv tvlv_roam;
3042
3043         primary_if = batadv_primary_if_get_selected(bat_priv);
3044         if (!primary_if)
3045                 goto out;
3046
3047         /* before going on we have to check whether the client has
3048          * already roamed to us too many times
3049          */
3050         if (!batadv_tt_check_roam_count(bat_priv, client))
3051                 goto out;
3052
3053         batadv_dbg(BATADV_DBG_TT, bat_priv,
3054                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3055                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3056
3057         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3058
3059         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3060         tvlv_roam.vid = htons(vid);
3061
3062         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3063                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3064                                  &tvlv_roam, sizeof(tvlv_roam));
3065
3066 out:
3067         if (primary_if)
3068                 batadv_hardif_free_ref(primary_if);
3069 }
3070
3071 static void batadv_tt_purge(struct work_struct *work)
3072 {
3073         struct delayed_work *delayed_work;
3074         struct batadv_priv_tt *priv_tt;
3075         struct batadv_priv *bat_priv;
3076
3077         delayed_work = container_of(work, struct delayed_work, work);
3078         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3079         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3080
3081         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3082         batadv_tt_global_purge(bat_priv);
3083         batadv_tt_req_purge(bat_priv);
3084         batadv_tt_roam_purge(bat_priv);
3085
3086         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3087                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3088 }
3089
3090 void batadv_tt_free(struct batadv_priv *bat_priv)
3091 {
3092         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3093         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3094
3095         cancel_delayed_work_sync(&bat_priv->tt.work);
3096
3097         batadv_tt_local_table_free(bat_priv);
3098         batadv_tt_global_table_free(bat_priv);
3099         batadv_tt_req_list_free(bat_priv);
3100         batadv_tt_changes_list_free(bat_priv);
3101         batadv_tt_roam_list_free(bat_priv);
3102
3103         kfree(bat_priv->tt.last_changeset);
3104 }
3105
3106 /**
3107  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3108  *  table and possibly count them in the TT size
3109  * @bat_priv: the bat priv with all the soft interface information
3110  * @flags: the flag to switch
3111  * @enable: whether to set or unset the flag
3112  * @count: whether to increase the TT size by the number of changed entries
3113  */
3114 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3115                                       uint16_t flags, bool enable, bool count)
3116 {
3117         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3118         struct batadv_tt_common_entry *tt_common_entry;
3119         uint16_t changed_num = 0;
3120         struct hlist_head *head;
3121         uint32_t i;
3122
3123         if (!hash)
3124                 return;
3125
3126         for (i = 0; i < hash->size; i++) {
3127                 head = &hash->table[i];
3128
3129                 rcu_read_lock();
3130                 hlist_for_each_entry_rcu(tt_common_entry,
3131                                          head, hash_entry) {
3132                         if (enable) {
3133                                 if ((tt_common_entry->flags & flags) == flags)
3134                                         continue;
3135                                 tt_common_entry->flags |= flags;
3136                         } else {
3137                                 if (!(tt_common_entry->flags & flags))
3138                                         continue;
3139                                 tt_common_entry->flags &= ~flags;
3140                         }
3141                         changed_num++;
3142
3143                         if (!count)
3144                                 continue;
3145
3146                         batadv_tt_local_size_inc(bat_priv,
3147                                                  tt_common_entry->vid);
3148                 }
3149                 rcu_read_unlock();
3150         }
3151 }
3152
3153 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3154 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3155 {
3156         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3157         struct batadv_tt_common_entry *tt_common;
3158         struct batadv_tt_local_entry *tt_local;
3159         struct batadv_softif_vlan *vlan;
3160         struct hlist_node *node_tmp;
3161         struct hlist_head *head;
3162         spinlock_t *list_lock; /* protects write access to the hash lists */
3163         uint32_t i;
3164
3165         if (!hash)
3166                 return;
3167
3168         for (i = 0; i < hash->size; i++) {
3169                 head = &hash->table[i];
3170                 list_lock = &hash->list_locks[i];
3171
3172                 spin_lock_bh(list_lock);
3173                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3174                                           hash_entry) {
3175                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3176                                 continue;
3177
3178                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3179                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3180                                    tt_common->addr,
3181                                    BATADV_PRINT_VID(tt_common->vid));
3182
3183                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3184                         hlist_del_rcu(&tt_common->hash_entry);
3185                         tt_local = container_of(tt_common,
3186                                                 struct batadv_tt_local_entry,
3187                                                 common);
3188
3189                         /* decrease the reference held for this vlan */
3190                         vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3191                         batadv_softif_vlan_free_ref(vlan);
3192                         batadv_softif_vlan_free_ref(vlan);
3193
3194                         batadv_tt_local_entry_free_ref(tt_local);
3195                 }
3196                 spin_unlock_bh(list_lock);
3197         }
3198 }
3199
3200 /**
3201  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3202  *  which have been queued in the time since the last commit
3203  * @bat_priv: the bat priv with all the soft interface information
3204  *
3205  * Caller must hold tt->commit_lock.
3206  */
3207 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3208 {
3209         /* Update multicast addresses in local translation table */
3210         batadv_mcast_mla_update(bat_priv);
3211
3212         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3213                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3214                         batadv_tt_tvlv_container_update(bat_priv);
3215                 return;
3216         }
3217
3218         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3219
3220         batadv_tt_local_purge_pending_clients(bat_priv);
3221         batadv_tt_local_update_crc(bat_priv);
3222
3223         /* Increment the TTVN only once per OGM interval */
3224         atomic_inc(&bat_priv->tt.vn);
3225         batadv_dbg(BATADV_DBG_TT, bat_priv,
3226                    "Local changes committed, updating to ttvn %u\n",
3227                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3228
3229         /* reset the sending counter */
3230         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3231         batadv_tt_tvlv_container_update(bat_priv);
3232 }
3233
3234 /**
3235  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3236  *  have been queued in the time since the last commit
3237  * @bat_priv: the bat priv with all the soft interface information
3238  */
3239 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3240 {
3241         spin_lock_bh(&bat_priv->tt.commit_lock);
3242         batadv_tt_local_commit_changes_nolock(bat_priv);
3243         spin_unlock_bh(&bat_priv->tt.commit_lock);
3244 }
3245
3246 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3247                            uint8_t *dst, unsigned short vid)
3248 {
3249         struct batadv_tt_local_entry *tt_local_entry = NULL;
3250         struct batadv_tt_global_entry *tt_global_entry = NULL;
3251         struct batadv_softif_vlan *vlan;
3252         bool ret = false;
3253
3254         vlan = batadv_softif_vlan_get(bat_priv, vid);
3255         if (!vlan || !atomic_read(&vlan->ap_isolation))
3256                 goto out;
3257
3258         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3259         if (!tt_local_entry)
3260                 goto out;
3261
3262         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3263         if (!tt_global_entry)
3264                 goto out;
3265
3266         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3267                 goto out;
3268
3269         ret = true;
3270
3271 out:
3272         if (vlan)
3273                 batadv_softif_vlan_free_ref(vlan);
3274         if (tt_global_entry)
3275                 batadv_tt_global_entry_free_ref(tt_global_entry);
3276         if (tt_local_entry)
3277                 batadv_tt_local_entry_free_ref(tt_local_entry);
3278         return ret;
3279 }
3280
3281 /**
3282  * batadv_tt_update_orig - update global translation table with new tt
3283  *  information received via ogms
3284  * @bat_priv: the bat priv with all the soft interface information
3285  * @orig: the orig_node of the ogm
3286  * @tt_vlan: pointer to the first tvlv VLAN entry
3287  * @tt_num_vlan: number of tvlv VLAN entries
3288  * @tt_change: pointer to the first entry in the TT buffer
3289  * @tt_num_changes: number of tt changes inside the tt buffer
3290  * @ttvn: translation table version number of this changeset
3291  * @tt_crc: crc32 checksum of orig node's translation table
3292  */
3293 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3294                                   struct batadv_orig_node *orig_node,
3295                                   const void *tt_buff, uint16_t tt_num_vlan,
3296                                   struct batadv_tvlv_tt_change *tt_change,
3297                                   uint16_t tt_num_changes, uint8_t ttvn)
3298 {
3299         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3300         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3301         bool full_table = true;
3302         bool has_tt_init;
3303
3304         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3305         has_tt_init = orig_node->capa_initialized & BATADV_ORIG_CAPA_HAS_TT;
3306
3307         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3308          * increased by one -> we can apply the attached changes
3309          */
3310         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3311                 /* the OGM could not contain the changes due to their size or
3312                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3313                  * times.
3314                  * In this case send a tt request
3315                  */
3316                 if (!tt_num_changes) {
3317                         full_table = false;
3318                         goto request_table;
3319                 }
3320
3321                 spin_lock_bh(&orig_node->tt_lock);
3322
3323                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3324                                          ttvn, tt_change);
3325
3326                 /* Even if we received the precomputed crc with the OGM, we
3327                  * prefer to recompute it to spot any possible inconsistency
3328                  * in the global table
3329                  */
3330                 batadv_tt_global_update_crc(bat_priv, orig_node);
3331
3332                 spin_unlock_bh(&orig_node->tt_lock);
3333
3334                 /* The ttvn alone is not enough to guarantee consistency
3335                  * because a single value could represent different states
3336                  * (due to the wrap around). Thus a node has to check whether
3337                  * the resulting table (after applying the changes) is still
3338                  * consistent or not. E.g. a node could disconnect while its
3339                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3340                  * checking the CRC value is mandatory to detect the
3341                  * inconsistency
3342                  */
3343                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3344                                                 tt_num_vlan))
3345                         goto request_table;
3346         } else {
3347                 /* if we missed more than one change or our tables are not
3348                  * in sync anymore -> request fresh tt data
3349                  */
3350                 if (!has_tt_init || ttvn != orig_ttvn ||
3351                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3352                                                 tt_num_vlan)) {
3353 request_table:
3354                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3355                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3356                                    orig_node->orig, ttvn, orig_ttvn,
3357                                    tt_num_changes);
3358                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3359                                                tt_vlan, tt_num_vlan,
3360                                                full_table);
3361                         return;
3362                 }
3363         }
3364 }
3365
3366 /**
3367  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3368  * @bat_priv: the bat priv with all the soft interface information
3369  * @addr: the mac address of the client to check
3370  * @vid: VLAN identifier
3371  *
3372  * Returns true if we know that the client has moved from its old originator
3373  * to another one. This entry is still kept for consistency purposes and will be
3374  * deleted later by a DEL or because of timeout
3375  */
3376 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3377                                         uint8_t *addr, unsigned short vid)
3378 {
3379         struct batadv_tt_global_entry *tt_global_entry;
3380         bool ret = false;
3381
3382         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3383         if (!tt_global_entry)
3384                 goto out;
3385
3386         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3387         batadv_tt_global_entry_free_ref(tt_global_entry);
3388 out:
3389         return ret;
3390 }
3391
3392 /**
3393  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3394  * @bat_priv: the bat priv with all the soft interface information
3395  * @addr: the mac address of the local client to query
3396  * @vid: VLAN identifier
3397  *
3398  * Returns true if the local client is known to be roaming (it is not served by
3399  * this node anymore) or not. If yes, the client is still present in the table
3400  * to keep the latter consistent with the node TTVN
3401  */
3402 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3403                                        uint8_t *addr, unsigned short vid)
3404 {
3405         struct batadv_tt_local_entry *tt_local_entry;
3406         bool ret = false;
3407
3408         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3409         if (!tt_local_entry)
3410                 goto out;
3411
3412         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3413         batadv_tt_local_entry_free_ref(tt_local_entry);
3414 out:
3415         return ret;
3416 }
3417
3418 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3419                                           struct batadv_orig_node *orig_node,
3420                                           const unsigned char *addr,
3421                                           unsigned short vid)
3422 {
3423         bool ret = false;
3424
3425         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3426                                   BATADV_TT_CLIENT_TEMP,
3427                                   atomic_read(&orig_node->last_ttvn)))
3428                 goto out;
3429
3430         batadv_dbg(BATADV_DBG_TT, bat_priv,
3431                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3432                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3433         ret = true;
3434 out:
3435         return ret;
3436 }
3437
3438 /**
3439  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3440  *  maximum packet size that can be transported through the mesh
3441  * @soft_iface: netdev struct of the mesh interface
3442  *
3443  * Remove entries older than 'timeout' and half timeout if more entries need
3444  * to be removed.
3445  */
3446 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3447 {
3448         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3449         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3450         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3451         bool reduced = false;
3452
3453         spin_lock_bh(&bat_priv->tt.commit_lock);
3454
3455         while (true) {
3456                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3457                 if (packet_size_max >= table_size)
3458                         break;
3459
3460                 batadv_tt_local_purge(bat_priv, timeout);
3461                 batadv_tt_local_purge_pending_clients(bat_priv);
3462
3463                 timeout /= 2;
3464                 reduced = true;
3465                 net_ratelimited_function(batadv_info, soft_iface,
3466                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3467                                          packet_size_max);
3468         }
3469
3470         /* commit these changes immediately, to avoid synchronization problem
3471          * with the TTVN
3472          */
3473         if (reduced)
3474                 batadv_tt_local_commit_changes_nolock(bat_priv);
3475
3476         spin_unlock_bh(&bat_priv->tt.commit_lock);
3477 }
3478
3479 /**
3480  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3481  * @bat_priv: the bat priv with all the soft interface information
3482  * @orig: the orig_node of the ogm
3483  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3484  * @tvlv_value: tvlv buffer containing the gateway data
3485  * @tvlv_value_len: tvlv buffer length
3486  */
3487 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3488                                           struct batadv_orig_node *orig,
3489                                           uint8_t flags, void *tvlv_value,
3490                                           uint16_t tvlv_value_len)
3491 {
3492         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3493         struct batadv_tvlv_tt_change *tt_change;
3494         struct batadv_tvlv_tt_data *tt_data;
3495         uint16_t num_entries, num_vlan;
3496
3497         if (tvlv_value_len < sizeof(*tt_data))
3498                 return;
3499
3500         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3501         tvlv_value_len -= sizeof(*tt_data);
3502
3503         num_vlan = ntohs(tt_data->num_vlan);
3504
3505         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3506                 return;
3507
3508         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3509         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3510         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3511
3512         num_entries = batadv_tt_entries(tvlv_value_len);
3513
3514         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3515                               num_entries, tt_data->ttvn);
3516 }
3517
3518 /**
3519  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3520  *  container
3521  * @bat_priv: the bat priv with all the soft interface information
3522  * @src: mac address of tt tvlv sender
3523  * @dst: mac address of tt tvlv recipient
3524  * @tvlv_value: tvlv buffer containing the tt data
3525  * @tvlv_value_len: tvlv buffer length
3526  *
3527  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3528  * otherwise.
3529  */
3530 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3531                                              uint8_t *src, uint8_t *dst,
3532                                              void *tvlv_value,
3533                                              uint16_t tvlv_value_len)
3534 {
3535         struct batadv_tvlv_tt_data *tt_data;
3536         uint16_t tt_vlan_len, tt_num_entries;
3537         char tt_flag;
3538         bool ret;
3539
3540         if (tvlv_value_len < sizeof(*tt_data))
3541                 return NET_RX_SUCCESS;
3542
3543         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3544         tvlv_value_len -= sizeof(*tt_data);
3545
3546         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3547         tt_vlan_len *= ntohs(tt_data->num_vlan);
3548
3549         if (tvlv_value_len < tt_vlan_len)
3550                 return NET_RX_SUCCESS;
3551
3552         tvlv_value_len -= tt_vlan_len;
3553         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3554
3555         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3556         case BATADV_TT_REQUEST:
3557                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3558
3559                 /* If this node cannot provide a TT response the tt_request is
3560                  * forwarded
3561                  */
3562                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3563                 if (!ret) {
3564                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3565                                 tt_flag = 'F';
3566                         else
3567                                 tt_flag = '.';
3568
3569                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3570                                    "Routing TT_REQUEST to %pM [%c]\n",
3571                                    dst, tt_flag);
3572                         /* tvlv API will re-route the packet */
3573                         return NET_RX_DROP;
3574                 }
3575                 break;
3576         case BATADV_TT_RESPONSE:
3577                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3578
3579                 if (batadv_is_my_mac(bat_priv, dst)) {
3580                         batadv_handle_tt_response(bat_priv, tt_data,
3581                                                   src, tt_num_entries);
3582                         return NET_RX_SUCCESS;
3583                 }
3584
3585                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3586                         tt_flag =  'F';
3587                 else
3588                         tt_flag = '.';
3589
3590                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3591                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3592
3593                 /* tvlv API will re-route the packet */
3594                 return NET_RX_DROP;
3595         }
3596
3597         return NET_RX_SUCCESS;
3598 }
3599
3600 /**
3601  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3602  * @bat_priv: the bat priv with all the soft interface information
3603  * @src: mac address of tt tvlv sender
3604  * @dst: mac address of tt tvlv recipient
3605  * @tvlv_value: tvlv buffer containing the tt data
3606  * @tvlv_value_len: tvlv buffer length
3607  *
3608  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3609  * otherwise.
3610  */
3611 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3612                                                uint8_t *src, uint8_t *dst,
3613                                                void *tvlv_value,
3614                                                uint16_t tvlv_value_len)
3615 {
3616         struct batadv_tvlv_roam_adv *roaming_adv;
3617         struct batadv_orig_node *orig_node = NULL;
3618
3619         /* If this node is not the intended recipient of the
3620          * roaming advertisement the packet is forwarded
3621          * (the tvlv API will re-route the packet).
3622          */
3623         if (!batadv_is_my_mac(bat_priv, dst))
3624                 return NET_RX_DROP;
3625
3626         if (tvlv_value_len < sizeof(*roaming_adv))
3627                 goto out;
3628
3629         orig_node = batadv_orig_hash_find(bat_priv, src);
3630         if (!orig_node)
3631                 goto out;
3632
3633         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3634         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3635
3636         batadv_dbg(BATADV_DBG_TT, bat_priv,
3637                    "Received ROAMING_ADV from %pM (client %pM)\n",
3638                    src, roaming_adv->client);
3639
3640         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3641                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3642                              atomic_read(&orig_node->last_ttvn) + 1);
3643
3644 out:
3645         if (orig_node)
3646                 batadv_orig_node_free_ref(orig_node);
3647         return NET_RX_SUCCESS;
3648 }
3649
3650 /**
3651  * batadv_tt_init - initialise the translation table internals
3652  * @bat_priv: the bat priv with all the soft interface information
3653  *
3654  * Return 0 on success or negative error number in case of failure.
3655  */
3656 int batadv_tt_init(struct batadv_priv *bat_priv)
3657 {
3658         int ret;
3659
3660         /* synchronized flags must be remote */
3661         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3662
3663         ret = batadv_tt_local_init(bat_priv);
3664         if (ret < 0)
3665                 return ret;
3666
3667         ret = batadv_tt_global_init(bat_priv);
3668         if (ret < 0)
3669                 return ret;
3670
3671         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3672                                      batadv_tt_tvlv_unicast_handler_v1,
3673                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3674
3675         batadv_tvlv_handler_register(bat_priv, NULL,
3676                                      batadv_roam_tvlv_unicast_handler_v1,
3677                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3678
3679         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3680         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3681                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3682
3683         return 1;
3684 }
3685
3686 /**
3687  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3688  * @bat_priv: the bat priv with all the soft interface information
3689  * @addr: the mac address of the client
3690  * @vid: the identifier of the VLAN where this client is connected
3691  *
3692  * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3693  * otherwise
3694  */
3695 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3696                                   const uint8_t *addr, unsigned short vid)
3697 {
3698         struct batadv_tt_global_entry *tt;
3699         bool ret;
3700
3701         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3702         if (!tt)
3703                 return false;
3704
3705         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3706
3707         batadv_tt_global_entry_free_ref(tt);
3708
3709         return ret;
3710 }