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