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