net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2015 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 "translation-table.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/bug.h>
  23 #include <linux/byteorder/generic.h>
  24 #include <linux/compiler.h>
  25 #include <linux/crc32c.h>
  26 #include <linux/errno.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/fs.h>
  29 #include <linux/if_ether.h>
  30 #include <linux/jhash.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/kernel.h>
  33 #include <linux/list.h>
  34 #include <linux/lockdep.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/rculist.h>
  37 #include <linux/rcupdate.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/slab.h>
  40 #include <linux/spinlock.h>
  41 #include <linux/stddef.h>
  42 #include <linux/string.h>
  43 #include <linux/workqueue.h>
  44 #include <net/net_namespace.h>
  45
  46 #include "bridge_loop_avoidance.h"
  47 #include "hard-interface.h"
  48 #include "hash.h"
  49 #include "multicast.h"
  50 #include "originator.h"
  51 #include "packet.h"
  52 #include "soft-interface.h"
  53
  54 /* hash class keys */
  55 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  56 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  57
  58 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
  59                                  unsigned short vid,
  60                                  struct batadv_orig_node *orig_node);
  61 static void batadv_tt_purge(struct work_struct *work);
  62 static void
  63 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  64 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  65                                  struct batadv_orig_node *orig_node,
  66                                  const unsigned char *addr,
  67                                  unsigned short vid, const char *message,
  68                                  bool roaming);
  69
  70 /* returns 1 if they are the same mac addr */
  71 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  72 {
  73         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  74                                          hash_entry);
  75
  76         return batadv_compare_eth(data1, data2);
  77 }
  78
  79 /**
  80  * batadv_choose_tt - return the index of the tt entry in the hash table
  81  * @data: pointer to the tt_common_entry object to map
  82  * @size: the size of the hash table
  83  *
  84  * Returns the hash index where the object represented by 'data' should be
  85  * stored at.
  86  */
  87 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
  88 {
  89         struct batadv_tt_common_entry *tt;
  90         uint32_t hash = 0;
  91
  92         tt = (struct batadv_tt_common_entry *)data;
  93         hash = jhash(&tt->addr, ETH_ALEN, hash);
  94         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
  95
  96         return hash % size;
  97 }
  98
  99 /**
 100  * batadv_tt_hash_find - look for a client in the given hash table
 101  * @hash: the hash table to search
 102  * @addr: the mac address of the client to look for
 103  * @vid: VLAN identifier
 104  *
 105  * Returns a pointer to the tt_common struct belonging to the searched client if
 106  * found, NULL otherwise.
 107  */
 108 static struct batadv_tt_common_entry *
 109 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
 110                     unsigned short vid)
 111 {
 112         struct hlist_head *head;
 113         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 114         uint32_t index;
 115
 116         if (!hash)
 117                 return NULL;
 118
 119         ether_addr_copy(to_search.addr, addr);
 120         to_search.vid = vid;
 121
 122         index = batadv_choose_tt(&to_search, hash->size);
 123         head = &hash->table[index];
 124
 125         rcu_read_lock();
 126         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 127                 if (!batadv_compare_eth(tt, addr))
 128                         continue;
 129
 130                 if (tt->vid != vid)
 131                         continue;
 132
 133                 if (!atomic_inc_not_zero(&tt->refcount))
 134                         continue;
 135
 136                 tt_tmp = tt;
 137                 break;
 138         }
 139         rcu_read_unlock();
 140
 141         return tt_tmp;
 142 }
 143
 144 /**
 145  * batadv_tt_local_hash_find - search the local table for a given client
 146  * @bat_priv: the bat priv with all the soft interface information
 147  * @addr: the mac address of the client to look for
 148  * @vid: VLAN identifier
 149  *
 150  * Returns a pointer to the corresponding tt_local_entry struct if the client is
 151  * found, NULL otherwise.
 152  */
 153 static struct batadv_tt_local_entry *
 154 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 155                           unsigned short vid)
 156 {
 157         struct batadv_tt_common_entry *tt_common_entry;
 158         struct batadv_tt_local_entry *tt_local_entry = NULL;
 159
 160         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 161                                               vid);
 162         if (tt_common_entry)
 163                 tt_local_entry = container_of(tt_common_entry,
 164                                               struct batadv_tt_local_entry,
 165                                               common);
 166         return tt_local_entry;
 167 }
 168
 169 /**
 170  * batadv_tt_global_hash_find - search the global table for a given client
 171  * @bat_priv: the bat priv with all the soft interface information
 172  * @addr: the mac address of the client to look for
 173  * @vid: VLAN identifier
 174  *
 175  * Returns a pointer to the corresponding tt_global_entry struct if the client
 176  * is found, NULL otherwise.
 177  */
 178 static struct batadv_tt_global_entry *
 179 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 180                            unsigned short vid)
 181 {
 182         struct batadv_tt_common_entry *tt_common_entry;
 183         struct batadv_tt_global_entry *tt_global_entry = NULL;
 184
 185         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 186                                               vid);
 187         if (tt_common_entry)
 188                 tt_global_entry = container_of(tt_common_entry,
 189                                                struct batadv_tt_global_entry,
 190                                                common);
 191         return tt_global_entry;
 192 }
 193
 194 static void
 195 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 196 {
 197         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 198                 kfree_rcu(tt_local_entry, common.rcu);
 199 }
 200
 201 /**
 202  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
 203  *  tt_global_entry and possibly free it
 204  * @tt_global_entry: the object to free
 205  */
 206 static void
 207 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 208 {
 209         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 210                 batadv_tt_global_del_orig_list(tt_global_entry);
 211                 kfree_rcu(tt_global_entry, common.rcu);
 212         }
 213 }
 214
 215 /**
 216  * batadv_tt_global_hash_count - count the number of orig entries
 217  * @hash: hash table containing the tt entries
 218  * @addr: the mac address of the client to count entries for
 219  * @vid: VLAN identifier
 220  *
 221  * Return the number of originators advertising the given address/data
 222  * (excluding ourself).
 223  */
 224 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
 225                                 const uint8_t *addr, unsigned short vid)
 226 {
 227         struct batadv_tt_global_entry *tt_global_entry;
 228         int count;
 229
 230         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 231         if (!tt_global_entry)
 232                 return 0;
 233
 234         count = atomic_read(&tt_global_entry->orig_list_count);
 235         batadv_tt_global_entry_free_ref(tt_global_entry);
 236
 237         return count;
 238 }
 239
 240 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 241 {
 242         struct batadv_tt_orig_list_entry *orig_entry;
 243
 244         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 245
 246         /* We are in an rcu callback here, therefore we cannot use
 247          * batadv_orig_node_free_ref() and its call_rcu():
 248          * An rcu_barrier() wouldn't wait for that to finish
 249          */
 250         batadv_orig_node_free_ref_now(orig_entry->orig_node);
 251         kfree(orig_entry);
 252 }
 253
 254 /**
 255  * batadv_tt_local_size_mod - change the size by v of the local table identified
 256  *  by vid
 257  * @bat_priv: the bat priv with all the soft interface information
 258  * @vid: the VLAN identifier of the sub-table to change
 259  * @v: the amount to sum to the local table size
 260  */
 261 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 262                                      unsigned short vid, int v)
 263 {
 264         struct batadv_softif_vlan *vlan;
 265
 266         vlan = batadv_softif_vlan_get(bat_priv, vid);
 267         if (!vlan)
 268                 return;
 269
 270         atomic_add(v, &vlan->tt.num_entries);
 271
 272         batadv_softif_vlan_free_ref(vlan);
 273 }
 274
 275 /**
 276  * batadv_tt_local_size_inc - increase by one the local table size for the given
 277  *  vid
 278  * @bat_priv: the bat priv with all the soft interface information
 279  * @vid: the VLAN identifier
 280  */
 281 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 282                                      unsigned short vid)
 283 {
 284         batadv_tt_local_size_mod(bat_priv, vid, 1);
 285 }
 286
 287 /**
 288  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 289  *  vid
 290  * @bat_priv: the bat priv with all the soft interface information
 291  * @vid: the VLAN identifier
 292  */
 293 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 294                                      unsigned short vid)
 295 {
 296         batadv_tt_local_size_mod(bat_priv, vid, -1);
 297 }
 298
 299 /**
 300  * batadv_tt_global_size_mod - change the size by v of the local table
 301  *  identified by vid
 302  * @bat_priv: the bat priv with all the soft interface information
 303  * @vid: the VLAN identifier
 304  * @v: the amount to sum to the global table size
 305  */
 306 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 307                                       unsigned short vid, int v)
 308 {
 309         struct batadv_orig_node_vlan *vlan;
 310
 311         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 312         if (!vlan)
 313                 return;
 314
 315         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 316                 spin_lock_bh(&orig_node->vlan_list_lock);
 317                 list_del_rcu(&vlan->list);
 318                 spin_unlock_bh(&orig_node->vlan_list_lock);
 319                 batadv_orig_node_vlan_free_ref(vlan);
 320         }
 321
 322         batadv_orig_node_vlan_free_ref(vlan);
 323 }
 324
 325 /**
 326  * batadv_tt_global_size_inc - increase by one the global table size for the
 327  *  given vid
 328  * @orig_node: the originator which global table size has to be decreased
 329  * @vid: the vlan identifier
 330  */
 331 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 332                                       unsigned short vid)
 333 {
 334         batadv_tt_global_size_mod(orig_node, vid, 1);
 335 }
 336
 337 /**
 338  * batadv_tt_global_size_dec - decrease by one the global table size for the
 339  *  given vid
 340  * @orig_node: the originator which global table size has to be decreased
 341  * @vid: the vlan identifier
 342  */
 343 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 344                                       unsigned short vid)
 345 {
 346         batadv_tt_global_size_mod(orig_node, vid, -1);
 347 }
 348
 349 static void
 350 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 351 {
 352         if (!atomic_dec_and_test(&orig_entry->refcount))
 353                 return;
 354
 355         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 356 }
 357
 358 /**
 359  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 360  * @bat_priv: the bat priv with all the soft interface information
 361  * @tt_local_entry: the TT entry involved in the event
 362  * @event_flags: flags to store in the event structure
 363  */
 364 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 365                                   struct batadv_tt_local_entry *tt_local_entry,
 366                                   uint8_t event_flags)
 367 {
 368         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 369         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 370         uint8_t flags = common->flags | event_flags;
 371         bool event_removed = false;
 372         bool del_op_requested, del_op_entry;
 373
 374         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 375         if (!tt_change_node)
 376                 return;
 377
 378         tt_change_node->change.flags = flags;
 379         memset(tt_change_node->change.reserved, 0,
 380                sizeof(tt_change_node->change.reserved));
 381         ether_addr_copy(tt_change_node->change.addr, common->addr);
 382         tt_change_node->change.vid = htons(common->vid);
 383
 384         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 385
 386         /* check for ADD+DEL or DEL+ADD events */
 387         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 388         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 389                                  list) {
 390                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 391                         continue;
 392
 393                 /* DEL+ADD in the same orig interval have no effect and can be
 394                  * removed to avoid silly behaviour on the receiver side. The
 395                  * other way around (ADD+DEL) can happen in case of roaming of
 396                  * a client still in the NEW state. Roaming of NEW clients is
 397                  * now possible due to automatically recognition of "temporary"
 398                  * clients
 399                  */
 400                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 401                 if (!del_op_requested && del_op_entry)
 402                         goto del;
 403                 if (del_op_requested && !del_op_entry)
 404                         goto del;
 405
 406                 /* this is a second add in the same originator interval. It
 407                  * means that flags have been changed: update them!
 408                  */
 409                 if (!del_op_requested && !del_op_entry)
 410                         entry->change.flags = flags;
 411
 412                 continue;
 413 del:
 414                 list_del(&entry->list);
 415                 kfree(entry);
 416                 kfree(tt_change_node);
 417                 event_removed = true;
 418                 goto unlock;
 419         }
 420
 421         /* track the change in the OGMinterval list */
 422         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 423
 424 unlock:
 425         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 426
 427         if (event_removed)
 428                 atomic_dec(&bat_priv->tt.local_changes);
 429         else
 430                 atomic_inc(&bat_priv->tt.local_changes);
 431 }
 432
 433 /**
 434  * batadv_tt_len - compute length in bytes of given number of tt changes
 435  * @changes_num: number of tt changes
 436  *
 437  * Returns computed length in bytes.
 438  */
 439 static int batadv_tt_len(int changes_num)
 440 {
 441         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 442 }
 443
 444 /**
 445  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 446  * @tt_len: available space
 447  *
 448  * Returns the number of entries.
 449  */
 450 static uint16_t batadv_tt_entries(uint16_t tt_len)
 451 {
 452         return tt_len / batadv_tt_len(1);
 453 }
 454
 455 /**
 456  * batadv_tt_local_table_transmit_size - calculates the local translation table
 457  *  size when transmitted over the air
 458  * @bat_priv: the bat priv with all the soft interface information
 459  *
 460  * Returns local translation table size in bytes.
 461  */
 462 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 463 {
 464         uint16_t num_vlan = 0, tt_local_entries = 0;
 465         struct batadv_softif_vlan *vlan;
 466         int hdr_size;
 467
 468         rcu_read_lock();
 469         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 470                 num_vlan++;
 471                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 472         }
 473         rcu_read_unlock();
 474
 475         /* header size of tvlv encapsulated tt response payload */
 476         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 477         hdr_size += sizeof(struct batadv_tvlv_hdr);
 478         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 479         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 480
 481         return hdr_size + batadv_tt_len(tt_local_entries);
 482 }
 483
 484 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 485 {
 486         if (bat_priv->tt.local_hash)
 487                 return 0;
 488
 489         bat_priv->tt.local_hash = batadv_hash_new(1024);
 490
 491         if (!bat_priv->tt.local_hash)
 492                 return -ENOMEM;
 493
 494         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 495                                    &batadv_tt_local_hash_lock_class_key);
 496
 497         return 0;
 498 }
 499
 500 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 501                                   struct batadv_tt_global_entry *tt_global,
 502                                   const char *message)
 503 {
 504         batadv_dbg(BATADV_DBG_TT, bat_priv,
 505                    "Deleting global tt entry %pM (vid: %d): %s\n",
 506                    tt_global->common.addr,
 507                    BATADV_PRINT_VID(tt_global->common.vid), message);
 508
 509         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 510                            batadv_choose_tt, &tt_global->common);
 511         batadv_tt_global_entry_free_ref(tt_global);
 512 }
 513
 514 /**
 515  * batadv_tt_local_add - add a new client to the local table or update an
 516  *  existing client
 517  * @soft_iface: netdev struct of the mesh interface
 518  * @addr: the mac address of the client to add
 519  * @vid: VLAN identifier
 520  * @ifindex: index of the interface where the client is connected to (useful to
 521  *  identify wireless clients)
 522  * @mark: the value contained in the skb->mark field of the received packet (if
 523  *  any)
 524  *
 525  * Returns true if the client was successfully added, false otherwise.
 526  */
 527 bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 528                          unsigned short vid, int ifindex, uint32_t mark)
 529 {
 530         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 531         struct batadv_tt_local_entry *tt_local;
 532         struct batadv_tt_global_entry *tt_global = NULL;
 533         struct batadv_softif_vlan *vlan;
 534         struct net_device *in_dev = NULL;
 535         struct hlist_head *head;
 536         struct batadv_tt_orig_list_entry *orig_entry;
 537         int hash_added, table_size, packet_size_max;
 538         bool ret = false, roamed_back = false;
 539         uint8_t remote_flags;
 540         uint32_t match_mark;
 541
 542         if (ifindex != BATADV_NULL_IFINDEX)
 543                 in_dev = dev_get_by_index(&init_net, ifindex);
 544
 545         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 546
 547         if (!is_multicast_ether_addr(addr))
 548                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 549
 550         if (tt_local) {
 551                 tt_local->last_seen = jiffies;
 552                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 553                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 554                                    "Re-adding pending client %pM (vid: %d)\n",
 555                                    addr, BATADV_PRINT_VID(vid));
 556                         /* whatever the reason why the PENDING flag was set,
 557                          * this is a client which was enqueued to be removed in
 558                          * this orig_interval. Since it popped up again, the
 559                          * flag can be reset like it was never enqueued
 560                          */
 561                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 562                         goto add_event;
 563                 }
 564
 565                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 566                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 567                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 568                                    addr, BATADV_PRINT_VID(vid));
 569                         /* the ROAM flag is set because this client roamed away
 570                          * and the node got a roaming_advertisement message. Now
 571                          * that the client popped up again at its original
 572                          * location such flag can be unset
 573                          */
 574                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 575                         roamed_back = true;
 576                 }
 577                 goto check_roaming;
 578         }
 579
 580         /* Ignore the client if we cannot send it in a full table response. */
 581         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 582         table_size += batadv_tt_len(1);
 583         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 584         if (table_size > packet_size_max) {
 585                 net_ratelimited_function(batadv_info, soft_iface,
 586                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 587                                          table_size, packet_size_max, addr);
 588                 goto out;
 589         }
 590
 591         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
 592         if (!tt_local)
 593                 goto out;
 594
 595         /* increase the refcounter of the related vlan */
 596         vlan = batadv_softif_vlan_get(bat_priv, vid);
 597
 598         batadv_dbg(BATADV_DBG_TT, bat_priv,
 599                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 600                    addr, BATADV_PRINT_VID(vid),
 601                    (uint8_t)atomic_read(&bat_priv->tt.vn));
 602
 603         ether_addr_copy(tt_local->common.addr, addr);
 604         /* The local entry has to be marked as NEW to avoid to send it in
 605          * a full table response going out before the next ttvn increment
 606          * (consistency check)
 607          */
 608         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 609         tt_local->common.vid = vid;
 610         if (batadv_is_wifi_netdev(in_dev))
 611                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 612         atomic_set(&tt_local->common.refcount, 2);
 613         tt_local->last_seen = jiffies;
 614         tt_local->common.added_at = tt_local->last_seen;
 615
 616         /* the batman interface mac and multicast addresses should never be
 617          * purged
 618          */
 619         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
 620             is_multicast_ether_addr(addr))
 621                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 622
 623         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 624                                      batadv_choose_tt, &tt_local->common,
 625                                      &tt_local->common.hash_entry);
 626
 627         if (unlikely(hash_added != 0)) {
 628                 /* remove the reference for the hash */
 629                 batadv_tt_local_entry_free_ref(tt_local);
 630                 batadv_softif_vlan_free_ref(vlan);
 631                 goto out;
 632         }
 633
 634 add_event:
 635         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 636
 637 check_roaming:
 638         /* Check whether it is a roaming, but don't do anything if the roaming
 639          * process has already been handled
 640          */
 641         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 642                 /* These node are probably going to update their tt table */
 643                 head = &tt_global->orig_list;
 644                 rcu_read_lock();
 645                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 646                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 647                                              tt_global->common.vid,
 648                                              orig_entry->orig_node);
 649                 }
 650                 rcu_read_unlock();
 651                 if (roamed_back) {
 652                         batadv_tt_global_free(bat_priv, tt_global,
 653                                               "Roaming canceled");
 654                         tt_global = NULL;
 655                 } else {
 656                         /* The global entry has to be marked as ROAMING and
 657                          * has to be kept for consistency purpose
 658                          */
 659                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 660                         tt_global->roam_at = jiffies;
 661                 }
 662         }
 663
 664         /* store the current remote flags before altering them. This helps
 665          * understanding is flags are changing or not
 666          */
 667         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 668
 669         if (batadv_is_wifi_netdev(in_dev))
 670                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 671         else
 672                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 673
 674         /* check the mark in the skb: if it's equal to the configured
 675          * isolation_mark, it means the packet is coming from an isolated
 676          * non-mesh client
 677          */
 678         match_mark = (mark & bat_priv->isolation_mark_mask);
 679         if (bat_priv->isolation_mark_mask &&
 680             match_mark == bat_priv->isolation_mark)
 681                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 682         else
 683                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 684
 685         /* if any "dynamic" flag has been modified, resend an ADD event for this
 686          * entry so that all the nodes can get the new flags
 687          */
 688         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 689                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 690
 691         ret = true;
 692 out:
 693         if (in_dev)
 694                 dev_put(in_dev);
 695         if (tt_local)
 696                 batadv_tt_local_entry_free_ref(tt_local);
 697         if (tt_global)
 698                 batadv_tt_global_entry_free_ref(tt_global);
 699         return ret;
 700 }
 701
 702 /**
 703  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 704  *  within a TT Response directed to another node
 705  * @orig_node: originator for which the TT data has to be prepared
 706  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 707  * @tt_change: uninitialised pointer to the address of the area where the TT
 708  *  changed can be stored
 709  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 710  *  function reserves the amount of space needed to send the entire global TT
 711  *  table. In case of success the value is updated with the real amount of
 712  *  reserved bytes
 713
 714  * Allocate the needed amount of memory for the entire TT TVLV and write its
 715  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 716  * objects, one per active VLAN served by the originator node.
 717  *
 718  * Return the size of the allocated buffer or 0 in case of failure.
 719  */
 720 static uint16_t
 721 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 722                                    struct batadv_tvlv_tt_data **tt_data,
 723                                    struct batadv_tvlv_tt_change **tt_change,
 724                                    int32_t *tt_len)
 725 {
 726         uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
 727         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 728         struct batadv_orig_node_vlan *vlan;
 729         uint8_t *tt_change_ptr;
 730
 731         rcu_read_lock();
 732         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 733                 num_vlan++;
 734                 num_entries += atomic_read(&vlan->tt.num_entries);
 735         }
 736
 737         change_offset = sizeof(**tt_data);
 738         change_offset += num_vlan * sizeof(*tt_vlan);
 739
 740         /* if tt_len is negative, allocate the space needed by the full table */
 741         if (*tt_len < 0)
 742                 *tt_len = batadv_tt_len(num_entries);
 743
 744         tvlv_len = *tt_len;
 745         tvlv_len += change_offset;
 746
 747         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 748         if (!*tt_data) {
 749                 *tt_len = 0;
 750                 goto out;
 751         }
 752
 753         (*tt_data)->flags = BATADV_NO_FLAGS;
 754         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 755         (*tt_data)->num_vlan = htons(num_vlan);
 756
 757         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 758         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 759                 tt_vlan->vid = htons(vlan->vid);
 760                 tt_vlan->crc = htonl(vlan->tt.crc);
 761
 762                 tt_vlan++;
 763         }
 764
 765         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 766         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 767
 768 out:
 769         rcu_read_unlock();
 770         return tvlv_len;
 771 }
 772
 773 /**
 774  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 775  *  node
 776  * @bat_priv: the bat priv with all the soft interface information
 777  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 778  * @tt_change: uninitialised pointer to the address of the area where the TT
 779  *  changes can be stored
 780  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 781  *  function reserves the amount of space needed to send the entire local TT
 782  *  table. In case of success the value is updated with the real amount of
 783  *  reserved bytes
 784  *
 785  * Allocate the needed amount of memory for the entire TT TVLV and write its
 786  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 787  * objects, one per active VLAN.
 788  *
 789  * Return the size of the allocated buffer or 0 in case of failure.
 790  */
 791 static uint16_t
 792 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 793                                   struct batadv_tvlv_tt_data **tt_data,
 794                                   struct batadv_tvlv_tt_change **tt_change,
 795                                   int32_t *tt_len)
 796 {
 797         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 798         struct batadv_softif_vlan *vlan;
 799         uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
 800         uint8_t *tt_change_ptr;
 801         int change_offset;
 802
 803         rcu_read_lock();
 804         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 805                 num_vlan++;
 806                 num_entries += atomic_read(&vlan->tt.num_entries);
 807         }
 808
 809         change_offset = sizeof(**tt_data);
 810         change_offset += num_vlan * sizeof(*tt_vlan);
 811
 812         /* if tt_len is negative, allocate the space needed by the full table */
 813         if (*tt_len < 0)
 814                 *tt_len = batadv_tt_len(num_entries);
 815
 816         tvlv_len = *tt_len;
 817         tvlv_len += change_offset;
 818
 819         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 820         if (!*tt_data) {
 821                 tvlv_len = 0;
 822                 goto out;
 823         }
 824
 825         (*tt_data)->flags = BATADV_NO_FLAGS;
 826         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 827         (*tt_data)->num_vlan = htons(num_vlan);
 828
 829         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 830         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 831                 tt_vlan->vid = htons(vlan->vid);
 832                 tt_vlan->crc = htonl(vlan->tt.crc);
 833
 834                 tt_vlan++;
 835         }
 836
 837         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 838         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 839
 840 out:
 841         rcu_read_unlock();
 842         return tvlv_len;
 843 }
 844
 845 /**
 846  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 847  *  after local tt changes have been committed
 848  * @bat_priv: the bat priv with all the soft interface information
 849  */
 850 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 851 {
 852         struct batadv_tt_change_node *entry, *safe;
 853         struct batadv_tvlv_tt_data *tt_data;
 854         struct batadv_tvlv_tt_change *tt_change;
 855         int tt_diff_len, tt_change_len = 0;
 856         int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
 857         uint16_t tvlv_len;
 858
 859         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 860         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 861
 862         /* if we have too many changes for one packet don't send any
 863          * and wait for the tt table request which will be fragmented
 864          */
 865         if (tt_diff_len > bat_priv->soft_iface->mtu)
 866                 tt_diff_len = 0;
 867
 868         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 869                                                      &tt_change, &tt_diff_len);
 870         if (!tvlv_len)
 871                 return;
 872
 873         tt_data->flags = BATADV_TT_OGM_DIFF;
 874
 875         if (tt_diff_len == 0)
 876                 goto container_register;
 877
 878         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 879         atomic_set(&bat_priv->tt.local_changes, 0);
 880
 881         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 882                                  list) {
 883                 if (tt_diff_entries_count < tt_diff_entries_num) {
 884                         memcpy(tt_change + tt_diff_entries_count,
 885                                &entry->change,
 886                                sizeof(struct batadv_tvlv_tt_change));
 887                         tt_diff_entries_count++;
 888                 }
 889                 list_del(&entry->list);
 890                 kfree(entry);
 891         }
 892         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 893
 894         /* Keep the buffer for possible tt_request */
 895         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 896         kfree(bat_priv->tt.last_changeset);
 897         bat_priv->tt.last_changeset_len = 0;
 898         bat_priv->tt.last_changeset = NULL;
 899         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 900         /* check whether this new OGM has no changes due to size problems */
 901         if (tt_diff_entries_count > 0) {
 902                 /* if kmalloc() fails we will reply with the full table
 903                  * instead of providing the diff
 904                  */
 905                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 906                 if (bat_priv->tt.last_changeset) {
 907                         memcpy(bat_priv->tt.last_changeset,
 908                                tt_change, tt_change_len);
 909                         bat_priv->tt.last_changeset_len = tt_diff_len;
 910                 }
 911         }
 912         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 913
 914 container_register:
 915         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 916                                        tvlv_len);
 917         kfree(tt_data);
 918 }
 919
 920 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 921 {
 922         struct net_device *net_dev = (struct net_device *)seq->private;
 923         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 924         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 925         struct batadv_tt_common_entry *tt_common_entry;
 926         struct batadv_tt_local_entry *tt_local;
 927         struct batadv_hard_iface *primary_if;
 928         struct batadv_softif_vlan *vlan;
 929         struct hlist_head *head;
 930         unsigned short vid;
 931         uint32_t i;
 932         int last_seen_secs;
 933         int last_seen_msecs;
 934         unsigned long last_seen_jiffies;
 935         bool no_purge;
 936         uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
 937
 938         primary_if = batadv_seq_print_text_primary_if_get(seq);
 939         if (!primary_if)
 940                 goto out;
 941
 942         seq_printf(seq,
 943                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 944                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
 945         seq_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
 946                    "Flags", "Last seen", "CRC");
 947
 948         for (i = 0; i < hash->size; i++) {
 949                 head = &hash->table[i];
 950
 951                 rcu_read_lock();
 952                 hlist_for_each_entry_rcu(tt_common_entry,
 953                                          head, hash_entry) {
 954                         tt_local = container_of(tt_common_entry,
 955                                                 struct batadv_tt_local_entry,
 956                                                 common);
 957                         vid = tt_common_entry->vid;
 958                         last_seen_jiffies = jiffies - tt_local->last_seen;
 959                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 960                         last_seen_secs = last_seen_msecs / 1000;
 961                         last_seen_msecs = last_seen_msecs % 1000;
 962
 963                         no_purge = tt_common_entry->flags & np_flag;
 964
 965                         vlan = batadv_softif_vlan_get(bat_priv, vid);
 966                         if (!vlan) {
 967                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
 968                                            BATADV_PRINT_VID(vid));
 969                                 continue;
 970                         }
 971
 972                         seq_printf(seq,
 973                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 974                                    tt_common_entry->addr,
 975                                    BATADV_PRINT_VID(tt_common_entry->vid),
 976                                    ((tt_common_entry->flags &
 977                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
 978                                    no_purge ? 'P' : '.',
 979                                    ((tt_common_entry->flags &
 980                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
 981                                    ((tt_common_entry->flags &
 982                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
 983                                    ((tt_common_entry->flags &
 984                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
 985                                    ((tt_common_entry->flags &
 986                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
 987                                    no_purge ? 0 : last_seen_secs,
 988                                    no_purge ? 0 : last_seen_msecs,
 989                                    vlan->tt.crc);
 990
 991                         batadv_softif_vlan_free_ref(vlan);
 992                 }
 993                 rcu_read_unlock();
 994         }
 995 out:
 996         if (primary_if)
 997                 batadv_hardif_free_ref(primary_if);
 998         return 0;
 999 }
1000
1001 static void
1002 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1003                             struct batadv_tt_local_entry *tt_local_entry,
1004                             uint16_t flags, const char *message)
1005 {
1006         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1007
1008         /* The local client has to be marked as "pending to be removed" but has
1009          * to be kept in the table in order to send it in a full table
1010          * response issued before the net ttvn increment (consistency check)
1011          */
1012         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1013
1014         batadv_dbg(BATADV_DBG_TT, bat_priv,
1015                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1016                    tt_local_entry->common.addr,
1017                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1018 }
1019
1020 /**
1021  * batadv_tt_local_remove - logically remove an entry from the local table
1022  * @bat_priv: the bat priv with all the soft interface information
1023  * @addr: the MAC address of the client to remove
1024  * @vid: VLAN identifier
1025  * @message: message to append to the log on deletion
1026  * @roaming: true if the deletion is due to a roaming event
1027  *
1028  * Returns the flags assigned to the local entry before being deleted
1029  */
1030 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
1031                                 const uint8_t *addr, unsigned short vid,
1032                                 const char *message, bool roaming)
1033 {
1034         struct batadv_tt_local_entry *tt_local_entry;
1035         uint16_t flags, curr_flags = BATADV_NO_FLAGS;
1036         struct batadv_softif_vlan *vlan;
1037
1038         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1039         if (!tt_local_entry)
1040                 goto out;
1041
1042         curr_flags = tt_local_entry->common.flags;
1043
1044         flags = BATADV_TT_CLIENT_DEL;
1045         /* if this global entry addition is due to a roaming, the node has to
1046          * mark the local entry as "roamed" in order to correctly reroute
1047          * packets later
1048          */
1049         if (roaming) {
1050                 flags |= BATADV_TT_CLIENT_ROAM;
1051                 /* mark the local client as ROAMed */
1052                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1053         }
1054
1055         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1056                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1057                                             message);
1058                 goto out;
1059         }
1060         /* if this client has been added right now, it is possible to
1061          * immediately purge it
1062          */
1063         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1064         hlist_del_rcu(&tt_local_entry->common.hash_entry);
1065         batadv_tt_local_entry_free_ref(tt_local_entry);
1066
1067         /* decrease the reference held for this vlan */
1068         vlan = batadv_softif_vlan_get(bat_priv, vid);
1069         batadv_softif_vlan_free_ref(vlan);
1070         batadv_softif_vlan_free_ref(vlan);
1071
1072 out:
1073         if (tt_local_entry)
1074                 batadv_tt_local_entry_free_ref(tt_local_entry);
1075
1076         return curr_flags;
1077 }
1078
1079 /**
1080  * batadv_tt_local_purge_list - purge inactive tt local entries
1081  * @bat_priv: the bat priv with all the soft interface information
1082  * @head: pointer to the list containing the local tt entries
1083  * @timeout: parameter deciding whether a given tt local entry is considered
1084  *  inactive or not
1085  */
1086 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1087                                        struct hlist_head *head,
1088                                        int timeout)
1089 {
1090         struct batadv_tt_local_entry *tt_local_entry;
1091         struct batadv_tt_common_entry *tt_common_entry;
1092         struct hlist_node *node_tmp;
1093
1094         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1095                                   hash_entry) {
1096                 tt_local_entry = container_of(tt_common_entry,
1097                                               struct batadv_tt_local_entry,
1098                                               common);
1099                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1100                         continue;
1101
1102                 /* entry already marked for deletion */
1103                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1104                         continue;
1105
1106                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1107                         continue;
1108
1109                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1110                                             BATADV_TT_CLIENT_DEL, "timed out");
1111         }
1112 }
1113
1114 /**
1115  * batadv_tt_local_purge - purge inactive tt local entries
1116  * @bat_priv: the bat priv with all the soft interface information
1117  * @timeout: parameter deciding whether a given tt local entry is considered
1118  *  inactive or not
1119  */
1120 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1121                                   int timeout)
1122 {
1123         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1124         struct hlist_head *head;
1125         spinlock_t *list_lock; /* protects write access to the hash lists */
1126         uint32_t i;
1127
1128         for (i = 0; i < hash->size; i++) {
1129                 head = &hash->table[i];
1130                 list_lock = &hash->list_locks[i];
1131
1132                 spin_lock_bh(list_lock);
1133                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1134                 spin_unlock_bh(list_lock);
1135         }
1136 }
1137
1138 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1139 {
1140         struct batadv_hashtable *hash;
1141         spinlock_t *list_lock; /* protects write access to the hash lists */
1142         struct batadv_tt_common_entry *tt_common_entry;
1143         struct batadv_tt_local_entry *tt_local;
1144         struct batadv_softif_vlan *vlan;
1145         struct hlist_node *node_tmp;
1146         struct hlist_head *head;
1147         uint32_t i;
1148
1149         if (!bat_priv->tt.local_hash)
1150                 return;
1151
1152         hash = bat_priv->tt.local_hash;
1153
1154         for (i = 0; i < hash->size; i++) {
1155                 head = &hash->table[i];
1156                 list_lock = &hash->list_locks[i];
1157
1158                 spin_lock_bh(list_lock);
1159                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1160                                           head, hash_entry) {
1161                         hlist_del_rcu(&tt_common_entry->hash_entry);
1162                         tt_local = container_of(tt_common_entry,
1163                                                 struct batadv_tt_local_entry,
1164                                                 common);
1165
1166                         /* decrease the reference held for this vlan */
1167                         vlan = batadv_softif_vlan_get(bat_priv,
1168                                                       tt_common_entry->vid);
1169                         batadv_softif_vlan_free_ref(vlan);
1170                         batadv_softif_vlan_free_ref(vlan);
1171
1172                         batadv_tt_local_entry_free_ref(tt_local);
1173                 }
1174                 spin_unlock_bh(list_lock);
1175         }
1176
1177         batadv_hash_destroy(hash);
1178
1179         bat_priv->tt.local_hash = NULL;
1180 }
1181
1182 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1183 {
1184         if (bat_priv->tt.global_hash)
1185                 return 0;
1186
1187         bat_priv->tt.global_hash = batadv_hash_new(1024);
1188
1189         if (!bat_priv->tt.global_hash)
1190                 return -ENOMEM;
1191
1192         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1193                                    &batadv_tt_global_hash_lock_class_key);
1194
1195         return 0;
1196 }
1197
1198 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1199 {
1200         struct batadv_tt_change_node *entry, *safe;
1201
1202         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1203
1204         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1205                                  list) {
1206                 list_del(&entry->list);
1207                 kfree(entry);
1208         }
1209
1210         atomic_set(&bat_priv->tt.local_changes, 0);
1211         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1212 }
1213
1214 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1215  * batadv_tt_global_entry list
1216  *
1217  * returns it with an increased refcounter, NULL if not found
1218  */
1219 static struct batadv_tt_orig_list_entry *
1220 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1221                                  const struct batadv_orig_node *orig_node)
1222 {
1223         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1224         const struct hlist_head *head;
1225
1226         rcu_read_lock();
1227         head = &entry->orig_list;
1228         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1229                 if (tmp_orig_entry->orig_node != orig_node)
1230                         continue;
1231                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1232                         continue;
1233
1234                 orig_entry = tmp_orig_entry;
1235                 break;
1236         }
1237         rcu_read_unlock();
1238
1239         return orig_entry;
1240 }
1241
1242 /* find out if an orig_node is already in the list of a tt_global_entry.
1243  * returns true if found, false otherwise
1244  */
1245 static bool
1246 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1247                                 const struct batadv_orig_node *orig_node)
1248 {
1249         struct batadv_tt_orig_list_entry *orig_entry;
1250         bool found = false;
1251
1252         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1253         if (orig_entry) {
1254                 found = true;
1255                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1256         }
1257
1258         return found;
1259 }
1260
1261 static void
1262 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1263                                 struct batadv_orig_node *orig_node, int ttvn)
1264 {
1265         struct batadv_tt_orig_list_entry *orig_entry;
1266
1267         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1268         if (orig_entry) {
1269                 /* refresh the ttvn: the current value could be a bogus one that
1270                  * was added during a "temporary client detection"
1271                  */
1272                 orig_entry->ttvn = ttvn;
1273                 goto out;
1274         }
1275
1276         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1277         if (!orig_entry)
1278                 goto out;
1279
1280         INIT_HLIST_NODE(&orig_entry->list);
1281         atomic_inc(&orig_node->refcount);
1282         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1283         orig_entry->orig_node = orig_node;
1284         orig_entry->ttvn = ttvn;
1285         atomic_set(&orig_entry->refcount, 2);
1286
1287         spin_lock_bh(&tt_global->list_lock);
1288         hlist_add_head_rcu(&orig_entry->list,
1289                            &tt_global->orig_list);
1290         spin_unlock_bh(&tt_global->list_lock);
1291         atomic_inc(&tt_global->orig_list_count);
1292
1293 out:
1294         if (orig_entry)
1295                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1296 }
1297
1298 /**
1299  * batadv_tt_global_add - add a new TT global entry or update an existing one
1300  * @bat_priv: the bat priv with all the soft interface information
1301  * @orig_node: the originator announcing the client
1302  * @tt_addr: the mac address of the non-mesh client
1303  * @vid: VLAN identifier
1304  * @flags: TT flags that have to be set for this non-mesh client
1305  * @ttvn: the tt version number ever announcing this non-mesh client
1306  *
1307  * Add a new TT global entry for the given originator. If the entry already
1308  * exists add a new reference to the given originator (a global entry can have
1309  * references to multiple originators) and adjust the flags attribute to reflect
1310  * the function argument.
1311  * If a TT local entry exists for this non-mesh client remove it.
1312  *
1313  * The caller must hold orig_node refcount.
1314  *
1315  * Return true if the new entry has been added, false otherwise
1316  */
1317 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1318                                  struct batadv_orig_node *orig_node,
1319                                  const unsigned char *tt_addr,
1320                                  unsigned short vid, uint16_t flags,
1321                                  uint8_t ttvn)
1322 {
1323         struct batadv_tt_global_entry *tt_global_entry;
1324         struct batadv_tt_local_entry *tt_local_entry;
1325         bool ret = false;
1326         int hash_added;
1327         struct batadv_tt_common_entry *common;
1328         uint16_t local_flags;
1329
1330         /* ignore global entries from backbone nodes */
1331         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1332                 return true;
1333
1334         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1335         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1336
1337         /* if the node already has a local client for this entry, it has to wait
1338          * for a roaming advertisement instead of manually messing up the global
1339          * table
1340          */
1341         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1342             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1343                 goto out;
1344
1345         if (!tt_global_entry) {
1346                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1347                 if (!tt_global_entry)
1348                         goto out;
1349
1350                 common = &tt_global_entry->common;
1351                 ether_addr_copy(common->addr, tt_addr);
1352                 common->vid = vid;
1353
1354                 common->flags = flags;
1355                 tt_global_entry->roam_at = 0;
1356                 /* node must store current time in case of roaming. This is
1357                  * needed to purge this entry out on timeout (if nobody claims
1358                  * it)
1359                  */
1360                 if (flags & BATADV_TT_CLIENT_ROAM)
1361                         tt_global_entry->roam_at = jiffies;
1362                 atomic_set(&common->refcount, 2);
1363                 common->added_at = jiffies;
1364
1365                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1366                 atomic_set(&tt_global_entry->orig_list_count, 0);
1367                 spin_lock_init(&tt_global_entry->list_lock);
1368
1369                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1370                                              batadv_compare_tt,
1371                                              batadv_choose_tt, common,
1372                                              &common->hash_entry);
1373
1374                 if (unlikely(hash_added != 0)) {
1375                         /* remove the reference for the hash */
1376                         batadv_tt_global_entry_free_ref(tt_global_entry);
1377                         goto out_remove;
1378                 }
1379         } else {
1380                 common = &tt_global_entry->common;
1381                 /* If there is already a global entry, we can use this one for
1382                  * our processing.
1383                  * But if we are trying to add a temporary client then here are
1384                  * two options at this point:
1385                  * 1) the global client is not a temporary client: the global
1386                  *    client has to be left as it is, temporary information
1387                  *    should never override any already known client state
1388                  * 2) the global client is a temporary client: purge the
1389                  *    originator list and add the new one orig_entry
1390                  */
1391                 if (flags & BATADV_TT_CLIENT_TEMP) {
1392                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1393                                 goto out;
1394                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1395                                                             orig_node))
1396                                 goto out_remove;
1397                         batadv_tt_global_del_orig_list(tt_global_entry);
1398                         goto add_orig_entry;
1399                 }
1400
1401                 /* if the client was temporary added before receiving the first
1402                  * OGM announcing it, we have to clear the TEMP flag
1403                  */
1404                 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1405
1406                 /* the change can carry possible "attribute" flags like the
1407                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1408                  * client entry
1409                  */
1410                 tt_global_entry->common.flags |= flags;
1411
1412                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1413                  * one originator left in the list and we previously received a
1414                  * delete + roaming change for this originator.
1415                  *
1416                  * We should first delete the old originator before adding the
1417                  * new one.
1418                  */
1419                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1420                         batadv_tt_global_del_orig_list(tt_global_entry);
1421                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1422                         tt_global_entry->roam_at = 0;
1423                 }
1424         }
1425 add_orig_entry:
1426         /* add the new orig_entry (if needed) or update it */
1427         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1428
1429         batadv_dbg(BATADV_DBG_TT, bat_priv,
1430                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1431                    common->addr, BATADV_PRINT_VID(common->vid),
1432                    orig_node->orig);
1433         ret = true;
1434
1435 out_remove:
1436         /* Do not remove multicast addresses from the local hash on
1437          * global additions
1438          */
1439         if (is_multicast_ether_addr(tt_addr))
1440                 goto out;
1441
1442         /* remove address from local hash if present */
1443         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1444                                              "global tt received",
1445                                              flags & BATADV_TT_CLIENT_ROAM);
1446         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1447
1448         if (!(flags & BATADV_TT_CLIENT_ROAM))
1449                 /* this is a normal global add. Therefore the client is not in a
1450                  * roaming state anymore.
1451                  */
1452                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1453
1454 out:
1455         if (tt_global_entry)
1456                 batadv_tt_global_entry_free_ref(tt_global_entry);
1457         if (tt_local_entry)
1458                 batadv_tt_local_entry_free_ref(tt_local_entry);
1459         return ret;
1460 }
1461
1462 /**
1463  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1464  * @bat_priv: the bat priv with all the soft interface information
1465  * @tt_global_entry: global translation table entry to be analyzed
1466  *
1467  * This functon assumes the caller holds rcu_read_lock().
1468  * Returns best originator list entry or NULL on errors.
1469  */
1470 static struct batadv_tt_orig_list_entry *
1471 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1472                             struct batadv_tt_global_entry *tt_global_entry)
1473 {
1474         struct batadv_neigh_node *router, *best_router = NULL;
1475         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1476         struct hlist_head *head;
1477         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1478
1479         head = &tt_global_entry->orig_list;
1480         hlist_for_each_entry_rcu(orig_entry, head, list) {
1481                 router = batadv_orig_router_get(orig_entry->orig_node,
1482                                                 BATADV_IF_DEFAULT);
1483                 if (!router)
1484                         continue;
1485
1486                 if (best_router &&
1487                     bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1488                                        best_router, BATADV_IF_DEFAULT) <= 0) {
1489                         batadv_neigh_node_free_ref(router);
1490                         continue;
1491                 }
1492
1493                 /* release the refcount for the "old" best */
1494                 if (best_router)
1495                         batadv_neigh_node_free_ref(best_router);
1496
1497                 best_entry = orig_entry;
1498                 best_router = router;
1499         }
1500
1501         if (best_router)
1502                 batadv_neigh_node_free_ref(best_router);
1503
1504         return best_entry;
1505 }
1506
1507 /**
1508  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1509  *  for this global entry
1510  * @bat_priv: the bat priv with all the soft interface information
1511  * @tt_global_entry: global translation table entry to be printed
1512  * @seq: debugfs table seq_file struct
1513  *
1514  * This functon assumes the caller holds rcu_read_lock().
1515  */
1516 static void
1517 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1518                              struct batadv_tt_global_entry *tt_global_entry,
1519                              struct seq_file *seq)
1520 {
1521         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1522         struct batadv_tt_common_entry *tt_common_entry;
1523         struct batadv_orig_node_vlan *vlan;
1524         struct hlist_head *head;
1525         uint8_t last_ttvn;
1526         uint16_t flags;
1527
1528         tt_common_entry = &tt_global_entry->common;
1529         flags = tt_common_entry->flags;
1530
1531         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1532         if (best_entry) {
1533                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1534                                                  tt_common_entry->vid);
1535                 if (!vlan) {
1536                         seq_printf(seq,
1537                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1538                                    BATADV_PRINT_VID(tt_common_entry->vid),
1539                                    best_entry->orig_node->orig);
1540                         goto print_list;
1541                 }
1542
1543                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1544                 seq_printf(seq,
1545                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1546                            '*', tt_global_entry->common.addr,
1547                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1548                            best_entry->ttvn, best_entry->orig_node->orig,
1549                            last_ttvn, vlan->tt.crc,
1550                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1551                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1552                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1553                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1554
1555                 batadv_orig_node_vlan_free_ref(vlan);
1556         }
1557
1558 print_list:
1559         head = &tt_global_entry->orig_list;
1560
1561         hlist_for_each_entry_rcu(orig_entry, head, list) {
1562                 if (best_entry == orig_entry)
1563                         continue;
1564
1565                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1566                                                  tt_common_entry->vid);
1567                 if (!vlan) {
1568                         seq_printf(seq,
1569                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1570                                    BATADV_PRINT_VID(tt_common_entry->vid),
1571                                    orig_entry->orig_node->orig);
1572                         continue;
1573                 }
1574
1575                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1576                 seq_printf(seq,
1577                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1578                            '+', tt_global_entry->common.addr,
1579                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1580                            orig_entry->ttvn, orig_entry->orig_node->orig,
1581                            last_ttvn, vlan->tt.crc,
1582                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1583                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1584                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1585                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1586
1587                 batadv_orig_node_vlan_free_ref(vlan);
1588         }
1589 }
1590
1591 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1592 {
1593         struct net_device *net_dev = (struct net_device *)seq->private;
1594         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1595         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1596         struct batadv_tt_common_entry *tt_common_entry;
1597         struct batadv_tt_global_entry *tt_global;
1598         struct batadv_hard_iface *primary_if;
1599         struct hlist_head *head;
1600         uint32_t i;
1601
1602         primary_if = batadv_seq_print_text_primary_if_get(seq);
1603         if (!primary_if)
1604                 goto out;
1605
1606         seq_printf(seq,
1607                    "Globally announced TT entries received via the mesh %s\n",
1608                    net_dev->name);
1609         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1610                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1611                    "CRC", "Flags");
1612
1613         for (i = 0; i < hash->size; i++) {
1614                 head = &hash->table[i];
1615
1616                 rcu_read_lock();
1617                 hlist_for_each_entry_rcu(tt_common_entry,
1618                                          head, hash_entry) {
1619                         tt_global = container_of(tt_common_entry,
1620                                                  struct batadv_tt_global_entry,
1621                                                  common);
1622                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1623                 }
1624                 rcu_read_unlock();
1625         }
1626 out:
1627         if (primary_if)
1628                 batadv_hardif_free_ref(primary_if);
1629         return 0;
1630 }
1631
1632 /**
1633  * batadv_tt_global_del_orig_entry - remove and free an orig_entry
1634  * @tt_global_entry: the global entry to remove the orig_entry from
1635  * @orig_entry: the orig entry to remove and free
1636  *
1637  * Remove an orig_entry from its list in the given tt_global_entry and
1638  * free this orig_entry afterwards.
1639  */
1640 static void
1641 batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1642                                 struct batadv_tt_orig_list_entry *orig_entry)
1643 {
1644         batadv_tt_global_size_dec(orig_entry->orig_node,
1645                                   tt_global_entry->common.vid);
1646         atomic_dec(&tt_global_entry->orig_list_count);
1647         hlist_del_rcu(&orig_entry->list);
1648         batadv_tt_orig_list_entry_free_ref(orig_entry);
1649 }
1650
1651 /* deletes the orig list of a tt_global_entry */
1652 static void
1653 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1654 {
1655         struct hlist_head *head;
1656         struct hlist_node *safe;
1657         struct batadv_tt_orig_list_entry *orig_entry;
1658
1659         spin_lock_bh(&tt_global_entry->list_lock);
1660         head = &tt_global_entry->orig_list;
1661         hlist_for_each_entry_safe(orig_entry, safe, head, list)
1662                 batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1663         spin_unlock_bh(&tt_global_entry->list_lock);
1664 }
1665
1666 /**
1667  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1668  * @bat_priv: the bat priv with all the soft interface information
1669  * @tt_global_entry: the global entry to remove the orig_node from
1670  * @orig_node: the originator announcing the client
1671  * @message: message to append to the log on deletion
1672  *
1673  * Remove the given orig_node and its according orig_entry from the given
1674  * global tt entry.
1675  */
1676 static void
1677 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1678                                struct batadv_tt_global_entry *tt_global_entry,
1679                                struct batadv_orig_node *orig_node,
1680                                const char *message)
1681 {
1682         struct hlist_head *head;
1683         struct hlist_node *safe;
1684         struct batadv_tt_orig_list_entry *orig_entry;
1685         unsigned short vid;
1686
1687         spin_lock_bh(&tt_global_entry->list_lock);
1688         head = &tt_global_entry->orig_list;
1689         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1690                 if (orig_entry->orig_node == orig_node) {
1691                         vid = tt_global_entry->common.vid;
1692                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1693                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1694                                    orig_node->orig,
1695                                    tt_global_entry->common.addr,
1696                                    BATADV_PRINT_VID(vid), message);
1697                         batadv_tt_global_del_orig_entry(tt_global_entry,
1698                                                         orig_entry);
1699                 }
1700         }
1701         spin_unlock_bh(&tt_global_entry->list_lock);
1702 }
1703
1704 /* If the client is to be deleted, we check if it is the last origantor entry
1705  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1706  * timer, otherwise we simply remove the originator scheduled for deletion.
1707  */
1708 static void
1709 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1710                              struct batadv_tt_global_entry *tt_global_entry,
1711                              struct batadv_orig_node *orig_node,
1712                              const char *message)
1713 {
1714         bool last_entry = true;
1715         struct hlist_head *head;
1716         struct batadv_tt_orig_list_entry *orig_entry;
1717
1718         /* no local entry exists, case 1:
1719          * Check if this is the last one or if other entries exist.
1720          */
1721
1722         rcu_read_lock();
1723         head = &tt_global_entry->orig_list;
1724         hlist_for_each_entry_rcu(orig_entry, head, list) {
1725                 if (orig_entry->orig_node != orig_node) {
1726                         last_entry = false;
1727                         break;
1728                 }
1729         }
1730         rcu_read_unlock();
1731
1732         if (last_entry) {
1733                 /* its the last one, mark for roaming. */
1734                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1735                 tt_global_entry->roam_at = jiffies;
1736         } else
1737                 /* there is another entry, we can simply delete this
1738                  * one and can still use the other one.
1739                  */
1740                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1741                                                orig_node, message);
1742 }
1743
1744 /**
1745  * batadv_tt_global_del - remove a client from the global table
1746  * @bat_priv: the bat priv with all the soft interface information
1747  * @orig_node: an originator serving this client
1748  * @addr: the mac address of the client
1749  * @vid: VLAN identifier
1750  * @message: a message explaining the reason for deleting the client to print
1751  *  for debugging purpose
1752  * @roaming: true if the deletion has been triggered by a roaming event
1753  */
1754 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1755                                  struct batadv_orig_node *orig_node,
1756                                  const unsigned char *addr, unsigned short vid,
1757                                  const char *message, bool roaming)
1758 {
1759         struct batadv_tt_global_entry *tt_global_entry;
1760         struct batadv_tt_local_entry *local_entry = NULL;
1761
1762         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1763         if (!tt_global_entry)
1764                 goto out;
1765
1766         if (!roaming) {
1767                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1768                                                orig_node, message);
1769
1770                 if (hlist_empty(&tt_global_entry->orig_list))
1771                         batadv_tt_global_free(bat_priv, tt_global_entry,
1772                                               message);
1773
1774                 goto out;
1775         }
1776
1777         /* if we are deleting a global entry due to a roam
1778          * event, there are two possibilities:
1779          * 1) the client roamed from node A to node B => if there
1780          *    is only one originator left for this client, we mark
1781          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1782          *    wait for node B to claim it. In case of timeout
1783          *    the entry is purged.
1784          *
1785          *    If there are other originators left, we directly delete
1786          *    the originator.
1787          * 2) the client roamed to us => we can directly delete
1788          *    the global entry, since it is useless now.
1789          */
1790         local_entry = batadv_tt_local_hash_find(bat_priv,
1791                                                 tt_global_entry->common.addr,
1792                                                 vid);
1793         if (local_entry) {
1794                 /* local entry exists, case 2: client roamed to us. */
1795                 batadv_tt_global_del_orig_list(tt_global_entry);
1796                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1797         } else
1798                 /* no local entry exists, case 1: check for roaming */
1799                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1800                                              orig_node, message);
1801
1802 out:
1803         if (tt_global_entry)
1804                 batadv_tt_global_entry_free_ref(tt_global_entry);
1805         if (local_entry)
1806                 batadv_tt_local_entry_free_ref(local_entry);
1807 }
1808
1809 /**
1810  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1811  *  given originator matching the provided vid
1812  * @bat_priv: the bat priv with all the soft interface information
1813  * @orig_node: the originator owning the entries to remove
1814  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1815  *  removed
1816  * @message: debug message to print as "reason"
1817  */
1818 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1819                                struct batadv_orig_node *orig_node,
1820                                int32_t match_vid,
1821                                const char *message)
1822 {
1823         struct batadv_tt_global_entry *tt_global;
1824         struct batadv_tt_common_entry *tt_common_entry;
1825         uint32_t i;
1826         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1827         struct hlist_node *safe;
1828         struct hlist_head *head;
1829         spinlock_t *list_lock; /* protects write access to the hash lists */
1830         unsigned short vid;
1831
1832         if (!hash)
1833                 return;
1834
1835         for (i = 0; i < hash->size; i++) {
1836                 head = &hash->table[i];
1837                 list_lock = &hash->list_locks[i];
1838
1839                 spin_lock_bh(list_lock);
1840                 hlist_for_each_entry_safe(tt_common_entry, safe,
1841                                           head, hash_entry) {
1842                         /* remove only matching entries */
1843                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1844                                 continue;
1845
1846                         tt_global = container_of(tt_common_entry,
1847                                                  struct batadv_tt_global_entry,
1848                                                  common);
1849
1850                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
1851                                                        orig_node, message);
1852
1853                         if (hlist_empty(&tt_global->orig_list)) {
1854                                 vid = tt_global->common.vid;
1855                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1856                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1857                                            tt_global->common.addr,
1858                                            BATADV_PRINT_VID(vid), message);
1859                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1860                                 batadv_tt_global_entry_free_ref(tt_global);
1861                         }
1862                 }
1863                 spin_unlock_bh(list_lock);
1864         }
1865         orig_node->capa_initialized &= ~BATADV_ORIG_CAPA_HAS_TT;
1866 }
1867
1868 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1869                                       char **msg)
1870 {
1871         bool purge = false;
1872         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1873         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1874
1875         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1876             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1877                 purge = true;
1878                 *msg = "Roaming timeout\n";
1879         }
1880
1881         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1882             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1883                 purge = true;
1884                 *msg = "Temporary client timeout\n";
1885         }
1886
1887         return purge;
1888 }
1889
1890 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1891 {
1892         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1893         struct hlist_head *head;
1894         struct hlist_node *node_tmp;
1895         spinlock_t *list_lock; /* protects write access to the hash lists */
1896         uint32_t i;
1897         char *msg = NULL;
1898         struct batadv_tt_common_entry *tt_common;
1899         struct batadv_tt_global_entry *tt_global;
1900
1901         for (i = 0; i < hash->size; i++) {
1902                 head = &hash->table[i];
1903                 list_lock = &hash->list_locks[i];
1904
1905                 spin_lock_bh(list_lock);
1906                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1907                                           hash_entry) {
1908                         tt_global = container_of(tt_common,
1909                                                  struct batadv_tt_global_entry,
1910                                                  common);
1911
1912                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1913                                 continue;
1914
1915                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1916                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1917                                    tt_global->common.addr,
1918                                    BATADV_PRINT_VID(tt_global->common.vid),
1919                                    msg);
1920
1921                         hlist_del_rcu(&tt_common->hash_entry);
1922
1923                         batadv_tt_global_entry_free_ref(tt_global);
1924                 }
1925                 spin_unlock_bh(list_lock);
1926         }
1927 }
1928
1929 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1930 {
1931         struct batadv_hashtable *hash;
1932         spinlock_t *list_lock; /* protects write access to the hash lists */
1933         struct batadv_tt_common_entry *tt_common_entry;
1934         struct batadv_tt_global_entry *tt_global;
1935         struct hlist_node *node_tmp;
1936         struct hlist_head *head;
1937         uint32_t i;
1938
1939         if (!bat_priv->tt.global_hash)
1940                 return;
1941
1942         hash = bat_priv->tt.global_hash;
1943
1944         for (i = 0; i < hash->size; i++) {
1945                 head = &hash->table[i];
1946                 list_lock = &hash->list_locks[i];
1947
1948                 spin_lock_bh(list_lock);
1949                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1950                                           head, hash_entry) {
1951                         hlist_del_rcu(&tt_common_entry->hash_entry);
1952                         tt_global = container_of(tt_common_entry,
1953                                                  struct batadv_tt_global_entry,
1954                                                  common);
1955                         batadv_tt_global_entry_free_ref(tt_global);
1956                 }
1957                 spin_unlock_bh(list_lock);
1958         }
1959
1960         batadv_hash_destroy(hash);
1961
1962         bat_priv->tt.global_hash = NULL;
1963 }
1964
1965 static bool
1966 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1967                        struct batadv_tt_global_entry *tt_global_entry)
1968 {
1969         bool ret = false;
1970
1971         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1972             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1973                 ret = true;
1974
1975         /* check if the two clients are marked as isolated */
1976         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
1977             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
1978                 ret = true;
1979
1980         return ret;
1981 }
1982
1983 /**
1984  * batadv_transtable_search - get the mesh destination for a given client
1985  * @bat_priv: the bat priv with all the soft interface information
1986  * @src: mac address of the source client
1987  * @addr: mac address of the destination client
1988  * @vid: VLAN identifier
1989  *
1990  * Returns a pointer to the originator that was selected as destination in the
1991  * mesh for contacting the client 'addr', NULL otherwise.
1992  * In case of multiple originators serving the same client, the function returns
1993  * the best one (best in terms of metric towards the destination node).
1994  *
1995  * If the two clients are AP isolated the function returns NULL.
1996  */
1997 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1998                                                   const uint8_t *src,
1999                                                   const uint8_t *addr,
2000                                                   unsigned short vid)
2001 {
2002         struct batadv_tt_local_entry *tt_local_entry = NULL;
2003         struct batadv_tt_global_entry *tt_global_entry = NULL;
2004         struct batadv_orig_node *orig_node = NULL;
2005         struct batadv_tt_orig_list_entry *best_entry;
2006
2007         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2008                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2009                 if (!tt_local_entry ||
2010                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2011                         goto out;
2012         }
2013
2014         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2015         if (!tt_global_entry)
2016                 goto out;
2017
2018         /* check whether the clients should not communicate due to AP
2019          * isolation
2020          */
2021         if (tt_local_entry &&
2022             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2023                 goto out;
2024
2025         rcu_read_lock();
2026         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2027         /* found anything? */
2028         if (best_entry)
2029                 orig_node = best_entry->orig_node;
2030         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2031                 orig_node = NULL;
2032         rcu_read_unlock();
2033
2034 out:
2035         if (tt_global_entry)
2036                 batadv_tt_global_entry_free_ref(tt_global_entry);
2037         if (tt_local_entry)
2038                 batadv_tt_local_entry_free_ref(tt_local_entry);
2039
2040         return orig_node;
2041 }
2042
2043 /**
2044  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2045  *  to the given orig_node
2046  * @bat_priv: the bat priv with all the soft interface information
2047  * @orig_node: originator for which the CRC should be computed
2048  * @vid: VLAN identifier for which the CRC32 has to be computed
2049  *
2050  * This function computes the checksum for the global table corresponding to a
2051  * specific originator. In particular, the checksum is computed as follows: For
2052  * each client connected to the originator the CRC32C of the MAC address and the
2053  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2054  * together.
2055  *
2056  * The idea behind is that CRC32C should be used as much as possible in order to
2057  * produce a unique hash of the table, but since the order which is used to feed
2058  * the CRC32C function affects the result and since every node in the network
2059  * probably sorts the clients differently, the hash function cannot be directly
2060  * computed over the entire table. Hence the CRC32C is used only on
2061  * the single client entry, while all the results are then xor'ed together
2062  * because the XOR operation can combine them all while trying to reduce the
2063  * noise as much as possible.
2064  *
2065  * Returns the checksum of the global table of a given originator.
2066  */
2067 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
2068                                      struct batadv_orig_node *orig_node,
2069                                      unsigned short vid)
2070 {
2071         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2072         struct batadv_tt_common_entry *tt_common;
2073         struct batadv_tt_global_entry *tt_global;
2074         struct hlist_head *head;
2075         uint32_t i, crc_tmp, crc = 0;
2076         uint8_t flags;
2077         __be16 tmp_vid;
2078
2079         for (i = 0; i < hash->size; i++) {
2080                 head = &hash->table[i];
2081
2082                 rcu_read_lock();
2083                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2084                         tt_global = container_of(tt_common,
2085                                                  struct batadv_tt_global_entry,
2086                                                  common);
2087                         /* compute the CRC only for entries belonging to the
2088                          * VLAN identified by the vid passed as parameter
2089                          */
2090                         if (tt_common->vid != vid)
2091                                 continue;
2092
2093                         /* Roaming clients are in the global table for
2094                          * consistency only. They don't have to be
2095                          * taken into account while computing the
2096                          * global crc
2097                          */
2098                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2099                                 continue;
2100                         /* Temporary clients have not been announced yet, so
2101                          * they have to be skipped while computing the global
2102                          * crc
2103                          */
2104                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2105                                 continue;
2106
2107                         /* find out if this global entry is announced by this
2108                          * originator
2109                          */
2110                         if (!batadv_tt_global_entry_has_orig(tt_global,
2111                                                              orig_node))
2112                                 continue;
2113
2114                         /* use network order to read the VID: this ensures that
2115                          * every node reads the bytes in the same order.
2116                          */
2117                         tmp_vid = htons(tt_common->vid);
2118                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2119
2120                         /* compute the CRC on flags that have to be kept in sync
2121                          * among nodes
2122                          */
2123                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2124                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2125
2126                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2127                 }
2128                 rcu_read_unlock();
2129         }
2130
2131         return crc;
2132 }
2133
2134 /**
2135  * batadv_tt_local_crc - calculates the checksum of the local table
2136  * @bat_priv: the bat priv with all the soft interface information
2137  * @vid: VLAN identifier for which the CRC32 has to be computed
2138  *
2139  * For details about the computation, please refer to the documentation for
2140  * batadv_tt_global_crc().
2141  *
2142  * Returns the checksum of the local table
2143  */
2144 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2145                                     unsigned short vid)
2146 {
2147         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2148         struct batadv_tt_common_entry *tt_common;
2149         struct hlist_head *head;
2150         uint32_t i, crc_tmp, crc = 0;
2151         uint8_t flags;
2152         __be16 tmp_vid;
2153
2154         for (i = 0; i < hash->size; i++) {
2155                 head = &hash->table[i];
2156
2157                 rcu_read_lock();
2158                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2159                         /* compute the CRC only for entries belonging to the
2160                          * VLAN identified by vid
2161                          */
2162                         if (tt_common->vid != vid)
2163                                 continue;
2164
2165                         /* not yet committed clients have not to be taken into
2166                          * account while computing the CRC
2167                          */
2168                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2169                                 continue;
2170
2171                         /* use network order to read the VID: this ensures that
2172                          * every node reads the bytes in the same order.
2173                          */
2174                         tmp_vid = htons(tt_common->vid);
2175                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2176
2177                         /* compute the CRC on flags that have to be kept in sync
2178                          * among nodes
2179                          */
2180                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2181                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2182
2183                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2184                 }
2185                 rcu_read_unlock();
2186         }
2187
2188         return crc;
2189 }
2190
2191 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2192 {
2193         struct batadv_tt_req_node *node, *safe;
2194
2195         spin_lock_bh(&bat_priv->tt.req_list_lock);
2196
2197         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2198                 list_del(&node->list);
2199                 kfree(node);
2200         }
2201
2202         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2203 }
2204
2205 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2206                                        struct batadv_orig_node *orig_node,
2207                                        const void *tt_buff,
2208                                        uint16_t tt_buff_len)
2209 {
2210         /* Replace the old buffer only if I received something in the
2211          * last OGM (the OGM could carry no changes)
2212          */
2213         spin_lock_bh(&orig_node->tt_buff_lock);
2214         if (tt_buff_len > 0) {
2215                 kfree(orig_node->tt_buff);
2216                 orig_node->tt_buff_len = 0;
2217                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2218                 if (orig_node->tt_buff) {
2219                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2220                         orig_node->tt_buff_len = tt_buff_len;
2221                 }
2222         }
2223         spin_unlock_bh(&orig_node->tt_buff_lock);
2224 }
2225
2226 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2227 {
2228         struct batadv_tt_req_node *node, *safe;
2229
2230         spin_lock_bh(&bat_priv->tt.req_list_lock);
2231         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2232                 if (batadv_has_timed_out(node->issued_at,
2233                                          BATADV_TT_REQUEST_TIMEOUT)) {
2234                         list_del(&node->list);
2235                         kfree(node);
2236                 }
2237         }
2238         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2239 }
2240
2241 /* returns the pointer to the new tt_req_node struct if no request
2242  * has already been issued for this orig_node, NULL otherwise
2243  */
2244 static struct batadv_tt_req_node *
2245 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2246                        struct batadv_orig_node *orig_node)
2247 {
2248         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2249
2250         spin_lock_bh(&bat_priv->tt.req_list_lock);
2251         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2252                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2253                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2254                                           BATADV_TT_REQUEST_TIMEOUT))
2255                         goto unlock;
2256         }
2257
2258         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2259         if (!tt_req_node)
2260                 goto unlock;
2261
2262         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2263         tt_req_node->issued_at = jiffies;
2264
2265         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2266 unlock:
2267         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2268         return tt_req_node;
2269 }
2270
2271 /**
2272  * batadv_tt_local_valid - verify that given tt entry is a valid one
2273  * @entry_ptr: to be checked local tt entry
2274  * @data_ptr: not used but definition required to satisfy the callback prototype
2275  *
2276  * Returns 1 if the entry is a valid, 0 otherwise.
2277  */
2278 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2279 {
2280         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2281
2282         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2283                 return 0;
2284         return 1;
2285 }
2286
2287 static int batadv_tt_global_valid(const void *entry_ptr,
2288                                   const void *data_ptr)
2289 {
2290         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2291         const struct batadv_tt_global_entry *tt_global_entry;
2292         const struct batadv_orig_node *orig_node = data_ptr;
2293
2294         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2295             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2296                 return 0;
2297
2298         tt_global_entry = container_of(tt_common_entry,
2299                                        struct batadv_tt_global_entry,
2300                                        common);
2301
2302         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2303 }
2304
2305 /**
2306  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2307  *  specified tt hash
2308  * @bat_priv: the bat priv with all the soft interface information
2309  * @hash: hash table containing the tt entries
2310  * @tt_len: expected tvlv tt data buffer length in number of bytes
2311  * @tvlv_buff: pointer to the buffer to fill with the TT data
2312  * @valid_cb: function to filter tt change entries
2313  * @cb_data: data passed to the filter function as argument
2314  */
2315 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2316                                     struct batadv_hashtable *hash,
2317                                     void *tvlv_buff, uint16_t tt_len,
2318                                     int (*valid_cb)(const void *, const void *),
2319                                     void *cb_data)
2320 {
2321         struct batadv_tt_common_entry *tt_common_entry;
2322         struct batadv_tvlv_tt_change *tt_change;
2323         struct hlist_head *head;
2324         uint16_t tt_tot, tt_num_entries = 0;
2325         uint32_t i;
2326
2327         tt_tot = batadv_tt_entries(tt_len);
2328         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2329
2330         rcu_read_lock();
2331         for (i = 0; i < hash->size; i++) {
2332                 head = &hash->table[i];
2333
2334                 hlist_for_each_entry_rcu(tt_common_entry,
2335                                          head, hash_entry) {
2336                         if (tt_tot == tt_num_entries)
2337                                 break;
2338
2339                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2340                                 continue;
2341
2342                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2343                         tt_change->flags = tt_common_entry->flags;
2344                         tt_change->vid = htons(tt_common_entry->vid);
2345                         memset(tt_change->reserved, 0,
2346                                sizeof(tt_change->reserved));
2347
2348                         tt_num_entries++;
2349                         tt_change++;
2350                 }
2351         }
2352         rcu_read_unlock();
2353 }
2354
2355 /**
2356  * batadv_tt_global_check_crc - check if all the CRCs are correct
2357  * @orig_node: originator for which the CRCs have to be checked
2358  * @tt_vlan: pointer to the first tvlv VLAN entry
2359  * @num_vlan: number of tvlv VLAN entries
2360  * @create: if true, create VLAN objects if not found
2361  *
2362  * Return true if all the received CRCs match the locally stored ones, false
2363  * otherwise
2364  */
2365 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2366                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2367                                        uint16_t num_vlan)
2368 {
2369         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2370         struct batadv_orig_node_vlan *vlan;
2371         uint32_t crc;
2372         int i;
2373
2374         /* check if each received CRC matches the locally stored one */
2375         for (i = 0; i < num_vlan; i++) {
2376                 tt_vlan_tmp = tt_vlan + i;
2377
2378                 /* if orig_node is a backbone node for this VLAN, don't check
2379                  * the CRC as we ignore all the global entries over it
2380                  */
2381                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2382                                                    orig_node->orig,
2383                                                    ntohs(tt_vlan_tmp->vid)))
2384                         continue;
2385
2386                 vlan = batadv_orig_node_vlan_get(orig_node,
2387                                                  ntohs(tt_vlan_tmp->vid));
2388                 if (!vlan)
2389                         return false;
2390
2391                 crc = vlan->tt.crc;
2392                 batadv_orig_node_vlan_free_ref(vlan);
2393
2394                 if (crc != ntohl(tt_vlan_tmp->crc))
2395                         return false;
2396         }
2397
2398         return true;
2399 }
2400
2401 /**
2402  * batadv_tt_local_update_crc - update all the local CRCs
2403  * @bat_priv: the bat priv with all the soft interface information
2404  */
2405 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2406 {
2407         struct batadv_softif_vlan *vlan;
2408
2409         /* recompute the global CRC for each VLAN */
2410         rcu_read_lock();
2411         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2412                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2413         }
2414         rcu_read_unlock();
2415 }
2416
2417 /**
2418  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2419  * @bat_priv: the bat priv with all the soft interface information
2420  * @orig_node: the orig_node for which the CRCs have to be updated
2421  */
2422 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2423                                         struct batadv_orig_node *orig_node)
2424 {
2425         struct batadv_orig_node_vlan *vlan;
2426         uint32_t crc;
2427
2428         /* recompute the global CRC for each VLAN */
2429         rcu_read_lock();
2430         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2431                 /* if orig_node is a backbone node for this VLAN, don't compute
2432                  * the CRC as we ignore all the global entries over it
2433                  */
2434                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2435                                                    vlan->vid))
2436                         continue;
2437
2438                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2439                 vlan->tt.crc = crc;
2440         }
2441         rcu_read_unlock();
2442 }
2443
2444 /**
2445  * batadv_send_tt_request - send a TT Request message to a given node
2446  * @bat_priv: the bat priv with all the soft interface information
2447  * @dst_orig_node: the destination of the message
2448  * @ttvn: the version number that the source of the message is looking for
2449  * @tt_vlan: pointer to the first tvlv VLAN object to request
2450  * @num_vlan: number of tvlv VLAN entries
2451  * @full_table: ask for the entire translation table if true, while only for the
2452  *  last TT diff otherwise
2453  */
2454 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2455                                   struct batadv_orig_node *dst_orig_node,
2456                                   uint8_t ttvn,
2457                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2458                                   uint16_t num_vlan, bool full_table)
2459 {
2460         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2461         struct batadv_tt_req_node *tt_req_node = NULL;
2462         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2463         struct batadv_hard_iface *primary_if;
2464         bool ret = false;
2465         int i, size;
2466
2467         primary_if = batadv_primary_if_get_selected(bat_priv);
2468         if (!primary_if)
2469                 goto out;
2470
2471         /* The new tt_req will be issued only if I'm not waiting for a
2472          * reply from the same orig_node yet
2473          */
2474         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2475         if (!tt_req_node)
2476                 goto out;
2477
2478         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2479         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2480         if (!tvlv_tt_data)
2481                 goto out;
2482
2483         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2484         tvlv_tt_data->ttvn = ttvn;
2485         tvlv_tt_data->num_vlan = htons(num_vlan);
2486
2487         /* send all the CRCs within the request. This is needed by intermediate
2488          * nodes to ensure they have the correct table before replying
2489          */
2490         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2491         for (i = 0; i < num_vlan; i++) {
2492                 tt_vlan_req->vid = tt_vlan->vid;
2493                 tt_vlan_req->crc = tt_vlan->crc;
2494
2495                 tt_vlan_req++;
2496                 tt_vlan++;
2497         }
2498
2499         if (full_table)
2500                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2501
2502         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2503                    dst_orig_node->orig, full_table ? 'F' : '.');
2504
2505         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2506         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2507                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2508                                  tvlv_tt_data, size);
2509         ret = true;
2510
2511 out:
2512         if (primary_if)
2513                 batadv_hardif_free_ref(primary_if);
2514         if (ret && tt_req_node) {
2515                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2516                 list_del(&tt_req_node->list);
2517                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2518                 kfree(tt_req_node);
2519         }
2520         kfree(tvlv_tt_data);
2521         return ret;
2522 }
2523
2524 /**
2525  * batadv_send_other_tt_response - send reply to tt request concerning another
2526  *  node's translation table
2527  * @bat_priv: the bat priv with all the soft interface information
2528  * @tt_data: tt data containing the tt request information
2529  * @req_src: mac address of tt request sender
2530  * @req_dst: mac address of tt request recipient
2531  *
2532  * Returns true if tt request reply was sent, false otherwise.
2533  */
2534 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2535                                           struct batadv_tvlv_tt_data *tt_data,
2536                                           uint8_t *req_src, uint8_t *req_dst)
2537 {
2538         struct batadv_orig_node *req_dst_orig_node;
2539         struct batadv_orig_node *res_dst_orig_node = NULL;
2540         struct batadv_tvlv_tt_change *tt_change;
2541         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2542         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2543         bool ret = false, full_table;
2544         uint8_t orig_ttvn, req_ttvn;
2545         uint16_t tvlv_len;
2546         int32_t tt_len;
2547
2548         batadv_dbg(BATADV_DBG_TT, bat_priv,
2549                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2550                    req_src, tt_data->ttvn, req_dst,
2551                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2552
2553         /* Let's get the orig node of the REAL destination */
2554         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2555         if (!req_dst_orig_node)
2556                 goto out;
2557
2558         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2559         if (!res_dst_orig_node)
2560                 goto out;
2561
2562         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2563         req_ttvn = tt_data->ttvn;
2564
2565         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2566         /* this node doesn't have the requested data */
2567         if (orig_ttvn != req_ttvn ||
2568             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2569                                         ntohs(tt_data->num_vlan)))
2570                 goto out;
2571
2572         /* If the full table has been explicitly requested */
2573         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2574             !req_dst_orig_node->tt_buff)
2575                 full_table = true;
2576         else
2577                 full_table = false;
2578
2579         /* TT fragmentation hasn't been implemented yet, so send as many
2580          * TT entries fit a single packet as possible only
2581          */
2582         if (!full_table) {
2583                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2584                 tt_len = req_dst_orig_node->tt_buff_len;
2585
2586                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2587                                                               &tvlv_tt_data,
2588                                                               &tt_change,
2589                                                               &tt_len);
2590                 if (!tt_len)
2591                         goto unlock;
2592
2593                 /* Copy the last orig_node's OGM buffer */
2594                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2595                        req_dst_orig_node->tt_buff_len);
2596                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2597         } else {
2598                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2599                  * in the initial part
2600                  */
2601                 tt_len = -1;
2602                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2603                                                               &tvlv_tt_data,
2604                                                               &tt_change,
2605                                                               &tt_len);
2606                 if (!tt_len)
2607                         goto out;
2608
2609                 /* fill the rest of the tvlv with the real TT entries */
2610                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2611                                         tt_change, tt_len,
2612                                         batadv_tt_global_valid,
2613                                         req_dst_orig_node);
2614         }
2615
2616         /* Don't send the response, if larger than fragmented packet. */
2617         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2618         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2619                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2620                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2621                                          res_dst_orig_node->orig);
2622                 goto out;
2623         }
2624
2625         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2626         tvlv_tt_data->ttvn = req_ttvn;
2627
2628         if (full_table)
2629                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2630
2631         batadv_dbg(BATADV_DBG_TT, bat_priv,
2632                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2633                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2634                    full_table ? 'F' : '.', req_ttvn);
2635
2636         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2637
2638         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2639                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2640                                  tvlv_len);
2641
2642         ret = true;
2643         goto out;
2644
2645 unlock:
2646         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2647
2648 out:
2649         if (res_dst_orig_node)
2650                 batadv_orig_node_free_ref(res_dst_orig_node);
2651         if (req_dst_orig_node)
2652                 batadv_orig_node_free_ref(req_dst_orig_node);
2653         kfree(tvlv_tt_data);
2654         return ret;
2655 }
2656
2657 /**
2658  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2659  *  translation table
2660  * @bat_priv: the bat priv with all the soft interface information
2661  * @tt_data: tt data containing the tt request information
2662  * @req_src: mac address of tt request sender
2663  *
2664  * Returns true if tt request reply was sent, false otherwise.
2665  */
2666 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2667                                        struct batadv_tvlv_tt_data *tt_data,
2668                                        uint8_t *req_src)
2669 {
2670         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2671         struct batadv_hard_iface *primary_if = NULL;
2672         struct batadv_tvlv_tt_change *tt_change;
2673         struct batadv_orig_node *orig_node;
2674         uint8_t my_ttvn, req_ttvn;
2675         uint16_t tvlv_len;
2676         bool full_table;
2677         int32_t tt_len;
2678
2679         batadv_dbg(BATADV_DBG_TT, bat_priv,
2680                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2681                    req_src, tt_data->ttvn,
2682                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2683
2684         spin_lock_bh(&bat_priv->tt.commit_lock);
2685
2686         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2687         req_ttvn = tt_data->ttvn;
2688
2689         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2690         if (!orig_node)
2691                 goto out;
2692
2693         primary_if = batadv_primary_if_get_selected(bat_priv);
2694         if (!primary_if)
2695                 goto out;
2696
2697         /* If the full table has been explicitly requested or the gap
2698          * is too big send the whole local translation table
2699          */
2700         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2701             !bat_priv->tt.last_changeset)
2702                 full_table = true;
2703         else
2704                 full_table = false;
2705
2706         /* TT fragmentation hasn't been implemented yet, so send as many
2707          * TT entries fit a single packet as possible only
2708          */
2709         if (!full_table) {
2710                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2711
2712                 tt_len = bat_priv->tt.last_changeset_len;
2713                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2714                                                              &tvlv_tt_data,
2715                                                              &tt_change,
2716                                                              &tt_len);
2717                 if (!tt_len)
2718                         goto unlock;
2719
2720                 /* Copy the last orig_node's OGM buffer */
2721                 memcpy(tt_change, bat_priv->tt.last_changeset,
2722                        bat_priv->tt.last_changeset_len);
2723                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2724         } else {
2725                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2726
2727                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2728                  * in the initial part
2729                  */
2730                 tt_len = -1;
2731                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2732                                                              &tvlv_tt_data,
2733                                                              &tt_change,
2734                                                              &tt_len);
2735                 if (!tt_len)
2736                         goto out;
2737
2738                 /* fill the rest of the tvlv with the real TT entries */
2739                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2740                                         tt_change, tt_len,
2741                                         batadv_tt_local_valid, NULL);
2742         }
2743
2744         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2745         tvlv_tt_data->ttvn = req_ttvn;
2746
2747         if (full_table)
2748                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2749
2750         batadv_dbg(BATADV_DBG_TT, bat_priv,
2751                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2752                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2753
2754         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2755
2756         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2757                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2758                                  tvlv_len);
2759
2760         goto out;
2761
2762 unlock:
2763         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2764 out:
2765         spin_unlock_bh(&bat_priv->tt.commit_lock);
2766         if (orig_node)
2767                 batadv_orig_node_free_ref(orig_node);
2768         if (primary_if)
2769                 batadv_hardif_free_ref(primary_if);
2770         kfree(tvlv_tt_data);
2771         /* The packet was for this host, so it doesn't need to be re-routed */
2772         return true;
2773 }
2774
2775 /**
2776  * batadv_send_tt_response - send reply to tt request
2777  * @bat_priv: the bat priv with all the soft interface information
2778  * @tt_data: tt data containing the tt request information
2779  * @req_src: mac address of tt request sender
2780  * @req_dst: mac address of tt request recipient
2781  *
2782  * Returns true if tt request reply was sent, false otherwise.
2783  */
2784 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2785                                     struct batadv_tvlv_tt_data *tt_data,
2786                                     uint8_t *req_src, uint8_t *req_dst)
2787 {
2788         if (batadv_is_my_mac(bat_priv, req_dst))
2789                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2790         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2791                                              req_dst);
2792 }
2793
2794 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2795                                       struct batadv_orig_node *orig_node,
2796                                       struct batadv_tvlv_tt_change *tt_change,
2797                                       uint16_t tt_num_changes, uint8_t ttvn)
2798 {
2799         int i;
2800         int roams;
2801
2802         for (i = 0; i < tt_num_changes; i++) {
2803                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2804                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2805                         batadv_tt_global_del(bat_priv, orig_node,
2806                                              (tt_change + i)->addr,
2807                                              ntohs((tt_change + i)->vid),
2808                                              "tt removed by changes",
2809                                              roams);
2810                 } else {
2811                         if (!batadv_tt_global_add(bat_priv, orig_node,
2812                                                   (tt_change + i)->addr,
2813                                                   ntohs((tt_change + i)->vid),
2814                                                   (tt_change + i)->flags, ttvn))
2815                                 /* In case of problem while storing a
2816                                  * global_entry, we stop the updating
2817                                  * procedure without committing the
2818                                  * ttvn change. This will avoid to send
2819                                  * corrupted data on tt_request
2820                                  */
2821                                 return;
2822                 }
2823         }
2824         orig_node->capa_initialized |= BATADV_ORIG_CAPA_HAS_TT;
2825 }
2826
2827 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2828                                   struct batadv_tvlv_tt_change *tt_change,
2829                                   uint8_t ttvn, uint8_t *resp_src,
2830                                   uint16_t num_entries)
2831 {
2832         struct batadv_orig_node *orig_node;
2833
2834         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2835         if (!orig_node)
2836                 goto out;
2837
2838         /* Purge the old table first.. */
2839         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2840                                   "Received full table");
2841
2842         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2843                                   ttvn);
2844
2845         spin_lock_bh(&orig_node->tt_buff_lock);
2846         kfree(orig_node->tt_buff);
2847         orig_node->tt_buff_len = 0;
2848         orig_node->tt_buff = NULL;
2849         spin_unlock_bh(&orig_node->tt_buff_lock);
2850
2851         atomic_set(&orig_node->last_ttvn, ttvn);
2852
2853 out:
2854         if (orig_node)
2855                 batadv_orig_node_free_ref(orig_node);
2856 }
2857
2858 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2859                                      struct batadv_orig_node *orig_node,
2860                                      uint16_t tt_num_changes, uint8_t ttvn,
2861                                      struct batadv_tvlv_tt_change *tt_change)
2862 {
2863         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2864                                   tt_num_changes, ttvn);
2865
2866         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2867                                    batadv_tt_len(tt_num_changes));
2868         atomic_set(&orig_node->last_ttvn, ttvn);
2869 }
2870
2871 /**
2872  * batadv_is_my_client - check if a client is served by the local node
2873  * @bat_priv: the bat priv with all the soft interface information
2874  * @addr: the mac address of the client to check
2875  * @vid: VLAN identifier
2876  *
2877  * Returns true if the client is served by this node, false otherwise.
2878  */
2879 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2880                          unsigned short vid)
2881 {
2882         struct batadv_tt_local_entry *tt_local_entry;
2883         bool ret = false;
2884
2885         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2886         if (!tt_local_entry)
2887                 goto out;
2888         /* Check if the client has been logically deleted (but is kept for
2889          * consistency purpose)
2890          */
2891         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2892             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2893                 goto out;
2894         ret = true;
2895 out:
2896         if (tt_local_entry)
2897                 batadv_tt_local_entry_free_ref(tt_local_entry);
2898         return ret;
2899 }
2900
2901 /**
2902  * batadv_handle_tt_response - process incoming tt reply
2903  * @bat_priv: the bat priv with all the soft interface information
2904  * @tt_data: tt data containing the tt request information
2905  * @resp_src: mac address of tt reply sender
2906  * @num_entries: number of tt change entries appended to the tt data
2907  */
2908 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2909                                       struct batadv_tvlv_tt_data *tt_data,
2910                                       uint8_t *resp_src, uint16_t num_entries)
2911 {
2912         struct batadv_tt_req_node *node, *safe;
2913         struct batadv_orig_node *orig_node = NULL;
2914         struct batadv_tvlv_tt_change *tt_change;
2915         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2916         uint16_t change_offset;
2917
2918         batadv_dbg(BATADV_DBG_TT, bat_priv,
2919                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2920                    resp_src, tt_data->ttvn, num_entries,
2921                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2922
2923         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2924         if (!orig_node)
2925                 goto out;
2926
2927         spin_lock_bh(&orig_node->tt_lock);
2928
2929         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2930         change_offset *= ntohs(tt_data->num_vlan);
2931         change_offset += sizeof(*tt_data);
2932         tvlv_ptr += change_offset;
2933
2934         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2935         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2936                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2937                                       resp_src, num_entries);
2938         } else {
2939                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2940                                          tt_data->ttvn, tt_change);
2941         }
2942
2943         /* Recalculate the CRC for this orig_node and store it */
2944         batadv_tt_global_update_crc(bat_priv, orig_node);
2945
2946         spin_unlock_bh(&orig_node->tt_lock);
2947
2948         /* Delete the tt_req_node from pending tt_requests list */
2949         spin_lock_bh(&bat_priv->tt.req_list_lock);
2950         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2951                 if (!batadv_compare_eth(node->addr, resp_src))
2952                         continue;
2953                 list_del(&node->list);
2954                 kfree(node);
2955         }
2956
2957         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2958 out:
2959         if (orig_node)
2960                 batadv_orig_node_free_ref(orig_node);
2961 }
2962
2963 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2964 {
2965         struct batadv_tt_roam_node *node, *safe;
2966
2967         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2968
2969         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2970                 list_del(&node->list);
2971                 kfree(node);
2972         }
2973
2974         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2975 }
2976
2977 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2978 {
2979         struct batadv_tt_roam_node *node, *safe;
2980
2981         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2982         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2983                 if (!batadv_has_timed_out(node->first_time,
2984                                           BATADV_ROAMING_MAX_TIME))
2985                         continue;
2986
2987                 list_del(&node->list);
2988                 kfree(node);
2989         }
2990         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2991 }
2992
2993 /* This function checks whether the client already reached the
2994  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2995  * will not be sent.
2996  *
2997  * returns true if the ROAMING_ADV can be sent, false otherwise
2998  */
2999 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
3000                                        uint8_t *client)
3001 {
3002         struct batadv_tt_roam_node *tt_roam_node;
3003         bool ret = false;
3004
3005         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3006         /* The new tt_req will be issued only if I'm not waiting for a
3007          * reply from the same orig_node yet
3008          */
3009         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3010                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3011                         continue;
3012
3013                 if (batadv_has_timed_out(tt_roam_node->first_time,
3014                                          BATADV_ROAMING_MAX_TIME))
3015                         continue;
3016
3017                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3018                         /* Sorry, you roamed too many times! */
3019                         goto unlock;
3020                 ret = true;
3021                 break;
3022         }
3023
3024         if (!ret) {
3025                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3026                 if (!tt_roam_node)
3027                         goto unlock;
3028
3029                 tt_roam_node->first_time = jiffies;
3030                 atomic_set(&tt_roam_node->counter,
3031                            BATADV_ROAMING_MAX_COUNT - 1);
3032                 ether_addr_copy(tt_roam_node->addr, client);
3033
3034                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3035                 ret = true;
3036         }
3037
3038 unlock:
3039         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3040         return ret;
3041 }
3042
3043 /**
3044  * batadv_send_roam_adv - send a roaming advertisement message
3045  * @bat_priv: the bat priv with all the soft interface information
3046  * @client: mac address of the roaming client
3047  * @vid: VLAN identifier
3048  * @orig_node: message destination
3049  *
3050  * Send a ROAMING_ADV message to the node which was previously serving this
3051  * client. This is done to inform the node that from now on all traffic destined
3052  * for this particular roamed client has to be forwarded to the sender of the
3053  * roaming message.
3054  */
3055 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
3056                                  unsigned short vid,
3057                                  struct batadv_orig_node *orig_node)
3058 {
3059         struct batadv_hard_iface *primary_if;
3060         struct batadv_tvlv_roam_adv tvlv_roam;
3061
3062         primary_if = batadv_primary_if_get_selected(bat_priv);
3063         if (!primary_if)
3064                 goto out;
3065
3066         /* before going on we have to check whether the client has
3067          * already roamed to us too many times
3068          */
3069         if (!batadv_tt_check_roam_count(bat_priv, client))
3070                 goto out;
3071
3072         batadv_dbg(BATADV_DBG_TT, bat_priv,
3073                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3074                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3075
3076         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3077
3078         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3079         tvlv_roam.vid = htons(vid);
3080
3081         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3082                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3083                                  &tvlv_roam, sizeof(tvlv_roam));
3084
3085 out:
3086         if (primary_if)
3087                 batadv_hardif_free_ref(primary_if);
3088 }
3089
3090 static void batadv_tt_purge(struct work_struct *work)
3091 {
3092         struct delayed_work *delayed_work;
3093         struct batadv_priv_tt *priv_tt;
3094         struct batadv_priv *bat_priv;
3095
3096         delayed_work = container_of(work, struct delayed_work, work);
3097         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3098         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3099
3100         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3101         batadv_tt_global_purge(bat_priv);
3102         batadv_tt_req_purge(bat_priv);
3103         batadv_tt_roam_purge(bat_priv);
3104
3105         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3106                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3107 }
3108
3109 void batadv_tt_free(struct batadv_priv *bat_priv)
3110 {
3111         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3112         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3113
3114         cancel_delayed_work_sync(&bat_priv->tt.work);
3115
3116         batadv_tt_local_table_free(bat_priv);
3117         batadv_tt_global_table_free(bat_priv);
3118         batadv_tt_req_list_free(bat_priv);
3119         batadv_tt_changes_list_free(bat_priv);
3120         batadv_tt_roam_list_free(bat_priv);
3121
3122         kfree(bat_priv->tt.last_changeset);
3123 }
3124
3125 /**
3126  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3127  *  table and possibly count them in the TT size
3128  * @bat_priv: the bat priv with all the soft interface information
3129  * @flags: the flag to switch
3130  * @enable: whether to set or unset the flag
3131  * @count: whether to increase the TT size by the number of changed entries
3132  */
3133 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3134                                       uint16_t flags, bool enable, bool count)
3135 {
3136         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3137         struct batadv_tt_common_entry *tt_common_entry;
3138         uint16_t changed_num = 0;
3139         struct hlist_head *head;
3140         uint32_t i;
3141
3142         if (!hash)
3143                 return;
3144
3145         for (i = 0; i < hash->size; i++) {
3146                 head = &hash->table[i];
3147
3148                 rcu_read_lock();
3149                 hlist_for_each_entry_rcu(tt_common_entry,
3150                                          head, hash_entry) {
3151                         if (enable) {
3152                                 if ((tt_common_entry->flags & flags) == flags)
3153                                         continue;
3154                                 tt_common_entry->flags |= flags;
3155                         } else {
3156                                 if (!(tt_common_entry->flags & flags))
3157                                         continue;
3158                                 tt_common_entry->flags &= ~flags;
3159                         }
3160                         changed_num++;
3161
3162                         if (!count)
3163                                 continue;
3164
3165                         batadv_tt_local_size_inc(bat_priv,
3166                                                  tt_common_entry->vid);
3167                 }
3168                 rcu_read_unlock();
3169         }
3170 }
3171
3172 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3173 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3174 {
3175         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3176         struct batadv_tt_common_entry *tt_common;
3177         struct batadv_tt_local_entry *tt_local;
3178         struct batadv_softif_vlan *vlan;
3179         struct hlist_node *node_tmp;
3180         struct hlist_head *head;
3181         spinlock_t *list_lock; /* protects write access to the hash lists */
3182         uint32_t i;
3183
3184         if (!hash)
3185                 return;
3186
3187         for (i = 0; i < hash->size; i++) {
3188                 head = &hash->table[i];
3189                 list_lock = &hash->list_locks[i];
3190
3191                 spin_lock_bh(list_lock);
3192                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3193                                           hash_entry) {
3194                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3195                                 continue;
3196
3197                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3198                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3199                                    tt_common->addr,
3200                                    BATADV_PRINT_VID(tt_common->vid));
3201
3202                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3203                         hlist_del_rcu(&tt_common->hash_entry);
3204                         tt_local = container_of(tt_common,
3205                                                 struct batadv_tt_local_entry,
3206                                                 common);
3207
3208                         /* decrease the reference held for this vlan */
3209                         vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3210                         batadv_softif_vlan_free_ref(vlan);
3211                         batadv_softif_vlan_free_ref(vlan);
3212
3213                         batadv_tt_local_entry_free_ref(tt_local);
3214                 }
3215                 spin_unlock_bh(list_lock);
3216         }
3217 }
3218
3219 /**
3220  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3221  *  which have been queued in the time since the last commit
3222  * @bat_priv: the bat priv with all the soft interface information
3223  *
3224  * Caller must hold tt->commit_lock.
3225  */
3226 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3227 {
3228         /* Update multicast addresses in local translation table */
3229         batadv_mcast_mla_update(bat_priv);
3230
3231         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3232                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3233                         batadv_tt_tvlv_container_update(bat_priv);
3234                 return;
3235         }
3236
3237         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3238
3239         batadv_tt_local_purge_pending_clients(bat_priv);
3240         batadv_tt_local_update_crc(bat_priv);
3241
3242         /* Increment the TTVN only once per OGM interval */
3243         atomic_inc(&bat_priv->tt.vn);
3244         batadv_dbg(BATADV_DBG_TT, bat_priv,
3245                    "Local changes committed, updating to ttvn %u\n",
3246                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3247
3248         /* reset the sending counter */
3249         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3250         batadv_tt_tvlv_container_update(bat_priv);
3251 }
3252
3253 /**
3254  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3255  *  have been queued in the time since the last commit
3256  * @bat_priv: the bat priv with all the soft interface information
3257  */
3258 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3259 {
3260         spin_lock_bh(&bat_priv->tt.commit_lock);
3261         batadv_tt_local_commit_changes_nolock(bat_priv);
3262         spin_unlock_bh(&bat_priv->tt.commit_lock);
3263 }
3264
3265 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3266                            uint8_t *dst, unsigned short vid)
3267 {
3268         struct batadv_tt_local_entry *tt_local_entry = NULL;
3269         struct batadv_tt_global_entry *tt_global_entry = NULL;
3270         struct batadv_softif_vlan *vlan;
3271         bool ret = false;
3272
3273         vlan = batadv_softif_vlan_get(bat_priv, vid);
3274         if (!vlan || !atomic_read(&vlan->ap_isolation))
3275                 goto out;
3276
3277         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3278         if (!tt_local_entry)
3279                 goto out;
3280
3281         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3282         if (!tt_global_entry)
3283                 goto out;
3284
3285         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3286                 goto out;
3287
3288         ret = true;
3289
3290 out:
3291         if (vlan)
3292                 batadv_softif_vlan_free_ref(vlan);
3293         if (tt_global_entry)
3294                 batadv_tt_global_entry_free_ref(tt_global_entry);
3295         if (tt_local_entry)
3296                 batadv_tt_local_entry_free_ref(tt_local_entry);
3297         return ret;
3298 }
3299
3300 /**
3301  * batadv_tt_update_orig - update global translation table with new tt
3302  *  information received via ogms
3303  * @bat_priv: the bat priv with all the soft interface information
3304  * @orig: the orig_node of the ogm
3305  * @tt_vlan: pointer to the first tvlv VLAN entry
3306  * @tt_num_vlan: number of tvlv VLAN entries
3307  * @tt_change: pointer to the first entry in the TT buffer
3308  * @tt_num_changes: number of tt changes inside the tt buffer
3309  * @ttvn: translation table version number of this changeset
3310  * @tt_crc: crc32 checksum of orig node's translation table
3311  */
3312 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3313                                   struct batadv_orig_node *orig_node,
3314                                   const void *tt_buff, uint16_t tt_num_vlan,
3315                                   struct batadv_tvlv_tt_change *tt_change,
3316                                   uint16_t tt_num_changes, uint8_t ttvn)
3317 {
3318         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3319         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3320         bool full_table = true;
3321         bool has_tt_init;
3322
3323         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3324         has_tt_init = orig_node->capa_initialized & BATADV_ORIG_CAPA_HAS_TT;
3325
3326         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3327          * increased by one -> we can apply the attached changes
3328          */
3329         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3330                 /* the OGM could not contain the changes due to their size or
3331                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3332                  * times.
3333                  * In this case send a tt request
3334                  */
3335                 if (!tt_num_changes) {
3336                         full_table = false;
3337                         goto request_table;
3338                 }
3339
3340                 spin_lock_bh(&orig_node->tt_lock);
3341
3342                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3343                                          ttvn, tt_change);
3344
3345                 /* Even if we received the precomputed crc with the OGM, we
3346                  * prefer to recompute it to spot any possible inconsistency
3347                  * in the global table
3348                  */
3349                 batadv_tt_global_update_crc(bat_priv, orig_node);
3350
3351                 spin_unlock_bh(&orig_node->tt_lock);
3352
3353                 /* The ttvn alone is not enough to guarantee consistency
3354                  * because a single value could represent different states
3355                  * (due to the wrap around). Thus a node has to check whether
3356                  * the resulting table (after applying the changes) is still
3357                  * consistent or not. E.g. a node could disconnect while its
3358                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3359                  * checking the CRC value is mandatory to detect the
3360                  * inconsistency
3361                  */
3362                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3363                                                 tt_num_vlan))
3364                         goto request_table;
3365         } else {
3366                 /* if we missed more than one change or our tables are not
3367                  * in sync anymore -> request fresh tt data
3368                  */
3369                 if (!has_tt_init || ttvn != orig_ttvn ||
3370                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3371                                                 tt_num_vlan)) {
3372 request_table:
3373                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3374                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3375                                    orig_node->orig, ttvn, orig_ttvn,
3376                                    tt_num_changes);
3377                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3378                                                tt_vlan, tt_num_vlan,
3379                                                full_table);
3380                         return;
3381                 }
3382         }
3383 }
3384
3385 /**
3386  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3387  * @bat_priv: the bat priv with all the soft interface information
3388  * @addr: the mac address of the client to check
3389  * @vid: VLAN identifier
3390  *
3391  * Returns true if we know that the client has moved from its old originator
3392  * to another one. This entry is still kept for consistency purposes and will be
3393  * deleted later by a DEL or because of timeout
3394  */
3395 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3396                                         uint8_t *addr, unsigned short vid)
3397 {
3398         struct batadv_tt_global_entry *tt_global_entry;
3399         bool ret = false;
3400
3401         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3402         if (!tt_global_entry)
3403                 goto out;
3404
3405         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3406         batadv_tt_global_entry_free_ref(tt_global_entry);
3407 out:
3408         return ret;
3409 }
3410
3411 /**
3412  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3413  * @bat_priv: the bat priv with all the soft interface information
3414  * @addr: the mac address of the local client to query
3415  * @vid: VLAN identifier
3416  *
3417  * Returns true if the local client is known to be roaming (it is not served by
3418  * this node anymore) or not. If yes, the client is still present in the table
3419  * to keep the latter consistent with the node TTVN
3420  */
3421 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3422                                        uint8_t *addr, unsigned short vid)
3423 {
3424         struct batadv_tt_local_entry *tt_local_entry;
3425         bool ret = false;
3426
3427         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3428         if (!tt_local_entry)
3429                 goto out;
3430
3431         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3432         batadv_tt_local_entry_free_ref(tt_local_entry);
3433 out:
3434         return ret;
3435 }
3436
3437 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3438                                           struct batadv_orig_node *orig_node,
3439                                           const unsigned char *addr,
3440                                           unsigned short vid)
3441 {
3442         bool ret = false;
3443
3444         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3445                                   BATADV_TT_CLIENT_TEMP,
3446                                   atomic_read(&orig_node->last_ttvn)))
3447                 goto out;
3448
3449         batadv_dbg(BATADV_DBG_TT, bat_priv,
3450                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3451                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3452         ret = true;
3453 out:
3454         return ret;
3455 }
3456
3457 /**
3458  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3459  *  maximum packet size that can be transported through the mesh
3460  * @soft_iface: netdev struct of the mesh interface
3461  *
3462  * Remove entries older than 'timeout' and half timeout if more entries need
3463  * to be removed.
3464  */
3465 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3466 {
3467         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3468         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3469         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3470         bool reduced = false;
3471
3472         spin_lock_bh(&bat_priv->tt.commit_lock);
3473
3474         while (true) {
3475                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3476                 if (packet_size_max >= table_size)
3477                         break;
3478
3479                 batadv_tt_local_purge(bat_priv, timeout);
3480                 batadv_tt_local_purge_pending_clients(bat_priv);
3481
3482                 timeout /= 2;
3483                 reduced = true;
3484                 net_ratelimited_function(batadv_info, soft_iface,
3485                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3486                                          packet_size_max);
3487         }
3488
3489         /* commit these changes immediately, to avoid synchronization problem
3490          * with the TTVN
3491          */
3492         if (reduced)
3493                 batadv_tt_local_commit_changes_nolock(bat_priv);
3494
3495         spin_unlock_bh(&bat_priv->tt.commit_lock);
3496 }
3497
3498 /**
3499  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3500  * @bat_priv: the bat priv with all the soft interface information
3501  * @orig: the orig_node of the ogm
3502  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3503  * @tvlv_value: tvlv buffer containing the gateway data
3504  * @tvlv_value_len: tvlv buffer length
3505  */
3506 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3507                                           struct batadv_orig_node *orig,
3508                                           uint8_t flags, void *tvlv_value,
3509                                           uint16_t tvlv_value_len)
3510 {
3511         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3512         struct batadv_tvlv_tt_change *tt_change;
3513         struct batadv_tvlv_tt_data *tt_data;
3514         uint16_t num_entries, num_vlan;
3515
3516         if (tvlv_value_len < sizeof(*tt_data))
3517                 return;
3518
3519         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3520         tvlv_value_len -= sizeof(*tt_data);
3521
3522         num_vlan = ntohs(tt_data->num_vlan);
3523
3524         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3525                 return;
3526
3527         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3528         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3529         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3530
3531         num_entries = batadv_tt_entries(tvlv_value_len);
3532
3533         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3534                               num_entries, tt_data->ttvn);
3535 }
3536
3537 /**
3538  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3539  *  container
3540  * @bat_priv: the bat priv with all the soft interface information
3541  * @src: mac address of tt tvlv sender
3542  * @dst: mac address of tt tvlv recipient
3543  * @tvlv_value: tvlv buffer containing the tt data
3544  * @tvlv_value_len: tvlv buffer length
3545  *
3546  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3547  * otherwise.
3548  */
3549 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3550                                              uint8_t *src, uint8_t *dst,
3551                                              void *tvlv_value,
3552                                              uint16_t tvlv_value_len)
3553 {
3554         struct batadv_tvlv_tt_data *tt_data;
3555         uint16_t tt_vlan_len, tt_num_entries;
3556         char tt_flag;
3557         bool ret;
3558
3559         if (tvlv_value_len < sizeof(*tt_data))
3560                 return NET_RX_SUCCESS;
3561
3562         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3563         tvlv_value_len -= sizeof(*tt_data);
3564
3565         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3566         tt_vlan_len *= ntohs(tt_data->num_vlan);
3567
3568         if (tvlv_value_len < tt_vlan_len)
3569                 return NET_RX_SUCCESS;
3570
3571         tvlv_value_len -= tt_vlan_len;
3572         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3573
3574         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3575         case BATADV_TT_REQUEST:
3576                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3577
3578                 /* If this node cannot provide a TT response the tt_request is
3579                  * forwarded
3580                  */
3581                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3582                 if (!ret) {
3583                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3584                                 tt_flag = 'F';
3585                         else
3586                                 tt_flag = '.';
3587
3588                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3589                                    "Routing TT_REQUEST to %pM [%c]\n",
3590                                    dst, tt_flag);
3591                         /* tvlv API will re-route the packet */
3592                         return NET_RX_DROP;
3593                 }
3594                 break;
3595         case BATADV_TT_RESPONSE:
3596                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3597
3598                 if (batadv_is_my_mac(bat_priv, dst)) {
3599                         batadv_handle_tt_response(bat_priv, tt_data,
3600                                                   src, tt_num_entries);
3601                         return NET_RX_SUCCESS;
3602                 }
3603
3604                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3605                         tt_flag =  'F';
3606                 else
3607                         tt_flag = '.';
3608
3609                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3610                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3611
3612                 /* tvlv API will re-route the packet */
3613                 return NET_RX_DROP;
3614         }
3615
3616         return NET_RX_SUCCESS;
3617 }
3618
3619 /**
3620  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3621  * @bat_priv: the bat priv with all the soft interface information
3622  * @src: mac address of tt tvlv sender
3623  * @dst: mac address of tt tvlv recipient
3624  * @tvlv_value: tvlv buffer containing the tt data
3625  * @tvlv_value_len: tvlv buffer length
3626  *
3627  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3628  * otherwise.
3629  */
3630 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3631                                                uint8_t *src, uint8_t *dst,
3632                                                void *tvlv_value,
3633                                                uint16_t tvlv_value_len)
3634 {
3635         struct batadv_tvlv_roam_adv *roaming_adv;
3636         struct batadv_orig_node *orig_node = NULL;
3637
3638         /* If this node is not the intended recipient of the
3639          * roaming advertisement the packet is forwarded
3640          * (the tvlv API will re-route the packet).
3641          */
3642         if (!batadv_is_my_mac(bat_priv, dst))
3643                 return NET_RX_DROP;
3644
3645         if (tvlv_value_len < sizeof(*roaming_adv))
3646                 goto out;
3647
3648         orig_node = batadv_orig_hash_find(bat_priv, src);
3649         if (!orig_node)
3650                 goto out;
3651
3652         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3653         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3654
3655         batadv_dbg(BATADV_DBG_TT, bat_priv,
3656                    "Received ROAMING_ADV from %pM (client %pM)\n",
3657                    src, roaming_adv->client);
3658
3659         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3660                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3661                              atomic_read(&orig_node->last_ttvn) + 1);
3662
3663 out:
3664         if (orig_node)
3665                 batadv_orig_node_free_ref(orig_node);
3666         return NET_RX_SUCCESS;
3667 }
3668
3669 /**
3670  * batadv_tt_init - initialise the translation table internals
3671  * @bat_priv: the bat priv with all the soft interface information
3672  *
3673  * Return 0 on success or negative error number in case of failure.
3674  */
3675 int batadv_tt_init(struct batadv_priv *bat_priv)
3676 {
3677         int ret;
3678
3679         /* synchronized flags must be remote */
3680         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3681
3682         ret = batadv_tt_local_init(bat_priv);
3683         if (ret < 0)
3684                 return ret;
3685
3686         ret = batadv_tt_global_init(bat_priv);
3687         if (ret < 0)
3688                 return ret;
3689
3690         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3691                                      batadv_tt_tvlv_unicast_handler_v1,
3692                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3693
3694         batadv_tvlv_handler_register(bat_priv, NULL,
3695                                      batadv_roam_tvlv_unicast_handler_v1,
3696                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3697
3698         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3699         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3700                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3701
3702         return 1;
3703 }
3704
3705 /**
3706  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3707  * @bat_priv: the bat priv with all the soft interface information
3708  * @addr: the mac address of the client
3709  * @vid: the identifier of the VLAN where this client is connected
3710  *
3711  * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3712  * otherwise
3713  */
3714 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3715                                   const uint8_t *addr, unsigned short vid)
3716 {
3717         struct batadv_tt_global_entry *tt;
3718         bool ret;
3719
3720         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3721         if (!tt)
3722                 return false;
3723
3724         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3725
3726         batadv_tt_global_entry_free_ref(tt);
3727
3728         return ret;
3729 }