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         if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
 598                  addr, BATADV_PRINT_VID(vid))) {
 599                 kfree(tt_local);
 600                 tt_local = NULL;
 601                 goto out;
 602         }
 603
 604         batadv_dbg(BATADV_DBG_TT, bat_priv,
 605                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 606                    addr, BATADV_PRINT_VID(vid),
 607                    (uint8_t)atomic_read(&bat_priv->tt.vn));
 608
 609         ether_addr_copy(tt_local->common.addr, addr);
 610         /* The local entry has to be marked as NEW to avoid to send it in
 611          * a full table response going out before the next ttvn increment
 612          * (consistency check)
 613          */
 614         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 615         tt_local->common.vid = vid;
 616         if (batadv_is_wifi_netdev(in_dev))
 617                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 618         atomic_set(&tt_local->common.refcount, 2);
 619         tt_local->last_seen = jiffies;
 620         tt_local->common.added_at = tt_local->last_seen;
 621
 622         /* the batman interface mac and multicast addresses should never be
 623          * purged
 624          */
 625         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
 626             is_multicast_ether_addr(addr))
 627                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 628
 629         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 630                                      batadv_choose_tt, &tt_local->common,
 631                                      &tt_local->common.hash_entry);
 632
 633         if (unlikely(hash_added != 0)) {
 634                 /* remove the reference for the hash */
 635                 batadv_tt_local_entry_free_ref(tt_local);
 636                 batadv_softif_vlan_free_ref(vlan);
 637                 goto out;
 638         }
 639
 640 add_event:
 641         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 642
 643 check_roaming:
 644         /* Check whether it is a roaming, but don't do anything if the roaming
 645          * process has already been handled
 646          */
 647         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 648                 /* These node are probably going to update their tt table */
 649                 head = &tt_global->orig_list;
 650                 rcu_read_lock();
 651                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 652                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 653                                              tt_global->common.vid,
 654                                              orig_entry->orig_node);
 655                 }
 656                 rcu_read_unlock();
 657                 if (roamed_back) {
 658                         batadv_tt_global_free(bat_priv, tt_global,
 659                                               "Roaming canceled");
 660                         tt_global = NULL;
 661                 } else {
 662                         /* The global entry has to be marked as ROAMING and
 663                          * has to be kept for consistency purpose
 664                          */
 665                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 666                         tt_global->roam_at = jiffies;
 667                 }
 668         }
 669
 670         /* store the current remote flags before altering them. This helps
 671          * understanding is flags are changing or not
 672          */
 673         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 674
 675         if (batadv_is_wifi_netdev(in_dev))
 676                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 677         else
 678                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 679
 680         /* check the mark in the skb: if it's equal to the configured
 681          * isolation_mark, it means the packet is coming from an isolated
 682          * non-mesh client
 683          */
 684         match_mark = (mark & bat_priv->isolation_mark_mask);
 685         if (bat_priv->isolation_mark_mask &&
 686             match_mark == bat_priv->isolation_mark)
 687                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 688         else
 689                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 690
 691         /* if any "dynamic" flag has been modified, resend an ADD event for this
 692          * entry so that all the nodes can get the new flags
 693          */
 694         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 695                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 696
 697         ret = true;
 698 out:
 699         if (in_dev)
 700                 dev_put(in_dev);
 701         if (tt_local)
 702                 batadv_tt_local_entry_free_ref(tt_local);
 703         if (tt_global)
 704                 batadv_tt_global_entry_free_ref(tt_global);
 705         return ret;
 706 }
 707
 708 /**
 709  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 710  *  within a TT Response directed to another node
 711  * @orig_node: originator for which the TT data has to be prepared
 712  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 713  * @tt_change: uninitialised pointer to the address of the area where the TT
 714  *  changed can be stored
 715  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 716  *  function reserves the amount of space needed to send the entire global TT
 717  *  table. In case of success the value is updated with the real amount of
 718  *  reserved bytes
 719
 720  * Allocate the needed amount of memory for the entire TT TVLV and write its
 721  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 722  * objects, one per active VLAN served by the originator node.
 723  *
 724  * Return the size of the allocated buffer or 0 in case of failure.
 725  */
 726 static uint16_t
 727 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 728                                    struct batadv_tvlv_tt_data **tt_data,
 729                                    struct batadv_tvlv_tt_change **tt_change,
 730                                    int32_t *tt_len)
 731 {
 732         uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
 733         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 734         struct batadv_orig_node_vlan *vlan;
 735         uint8_t *tt_change_ptr;
 736
 737         rcu_read_lock();
 738         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 739                 num_vlan++;
 740                 num_entries += atomic_read(&vlan->tt.num_entries);
 741         }
 742
 743         change_offset = sizeof(**tt_data);
 744         change_offset += num_vlan * sizeof(*tt_vlan);
 745
 746         /* if tt_len is negative, allocate the space needed by the full table */
 747         if (*tt_len < 0)
 748                 *tt_len = batadv_tt_len(num_entries);
 749
 750         tvlv_len = *tt_len;
 751         tvlv_len += change_offset;
 752
 753         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 754         if (!*tt_data) {
 755                 *tt_len = 0;
 756                 goto out;
 757         }
 758
 759         (*tt_data)->flags = BATADV_NO_FLAGS;
 760         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 761         (*tt_data)->num_vlan = htons(num_vlan);
 762
 763         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 764         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 765                 tt_vlan->vid = htons(vlan->vid);
 766                 tt_vlan->crc = htonl(vlan->tt.crc);
 767
 768                 tt_vlan++;
 769         }
 770
 771         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 772         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 773
 774 out:
 775         rcu_read_unlock();
 776         return tvlv_len;
 777 }
 778
 779 /**
 780  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 781  *  node
 782  * @bat_priv: the bat priv with all the soft interface information
 783  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 784  * @tt_change: uninitialised pointer to the address of the area where the TT
 785  *  changes can be stored
 786  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 787  *  function reserves the amount of space needed to send the entire local TT
 788  *  table. In case of success the value is updated with the real amount of
 789  *  reserved bytes
 790  *
 791  * Allocate the needed amount of memory for the entire TT TVLV and write its
 792  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 793  * objects, one per active VLAN.
 794  *
 795  * Return the size of the allocated buffer or 0 in case of failure.
 796  */
 797 static uint16_t
 798 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 799                                   struct batadv_tvlv_tt_data **tt_data,
 800                                   struct batadv_tvlv_tt_change **tt_change,
 801                                   int32_t *tt_len)
 802 {
 803         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 804         struct batadv_softif_vlan *vlan;
 805         uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
 806         uint8_t *tt_change_ptr;
 807         int change_offset;
 808
 809         rcu_read_lock();
 810         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 811                 num_vlan++;
 812                 num_entries += atomic_read(&vlan->tt.num_entries);
 813         }
 814
 815         change_offset = sizeof(**tt_data);
 816         change_offset += num_vlan * sizeof(*tt_vlan);
 817
 818         /* if tt_len is negative, allocate the space needed by the full table */
 819         if (*tt_len < 0)
 820                 *tt_len = batadv_tt_len(num_entries);
 821
 822         tvlv_len = *tt_len;
 823         tvlv_len += change_offset;
 824
 825         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 826         if (!*tt_data) {
 827                 tvlv_len = 0;
 828                 goto out;
 829         }
 830
 831         (*tt_data)->flags = BATADV_NO_FLAGS;
 832         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 833         (*tt_data)->num_vlan = htons(num_vlan);
 834
 835         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 836         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 837                 tt_vlan->vid = htons(vlan->vid);
 838                 tt_vlan->crc = htonl(vlan->tt.crc);
 839
 840                 tt_vlan++;
 841         }
 842
 843         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 844         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 845
 846 out:
 847         rcu_read_unlock();
 848         return tvlv_len;
 849 }
 850
 851 /**
 852  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 853  *  after local tt changes have been committed
 854  * @bat_priv: the bat priv with all the soft interface information
 855  */
 856 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 857 {
 858         struct batadv_tt_change_node *entry, *safe;
 859         struct batadv_tvlv_tt_data *tt_data;
 860         struct batadv_tvlv_tt_change *tt_change;
 861         int tt_diff_len, tt_change_len = 0;
 862         int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
 863         uint16_t tvlv_len;
 864
 865         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 866         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 867
 868         /* if we have too many changes for one packet don't send any
 869          * and wait for the tt table request which will be fragmented
 870          */
 871         if (tt_diff_len > bat_priv->soft_iface->mtu)
 872                 tt_diff_len = 0;
 873
 874         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 875                                                      &tt_change, &tt_diff_len);
 876         if (!tvlv_len)
 877                 return;
 878
 879         tt_data->flags = BATADV_TT_OGM_DIFF;
 880
 881         if (tt_diff_len == 0)
 882                 goto container_register;
 883
 884         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 885         atomic_set(&bat_priv->tt.local_changes, 0);
 886
 887         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 888                                  list) {
 889                 if (tt_diff_entries_count < tt_diff_entries_num) {
 890                         memcpy(tt_change + tt_diff_entries_count,
 891                                &entry->change,
 892                                sizeof(struct batadv_tvlv_tt_change));
 893                         tt_diff_entries_count++;
 894                 }
 895                 list_del(&entry->list);
 896                 kfree(entry);
 897         }
 898         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 899
 900         /* Keep the buffer for possible tt_request */
 901         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 902         kfree(bat_priv->tt.last_changeset);
 903         bat_priv->tt.last_changeset_len = 0;
 904         bat_priv->tt.last_changeset = NULL;
 905         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 906         /* check whether this new OGM has no changes due to size problems */
 907         if (tt_diff_entries_count > 0) {
 908                 /* if kmalloc() fails we will reply with the full table
 909                  * instead of providing the diff
 910                  */
 911                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 912                 if (bat_priv->tt.last_changeset) {
 913                         memcpy(bat_priv->tt.last_changeset,
 914                                tt_change, tt_change_len);
 915                         bat_priv->tt.last_changeset_len = tt_diff_len;
 916                 }
 917         }
 918         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 919
 920 container_register:
 921         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 922                                        tvlv_len);
 923         kfree(tt_data);
 924 }
 925
 926 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 927 {
 928         struct net_device *net_dev = (struct net_device *)seq->private;
 929         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 930         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 931         struct batadv_tt_common_entry *tt_common_entry;
 932         struct batadv_tt_local_entry *tt_local;
 933         struct batadv_hard_iface *primary_if;
 934         struct batadv_softif_vlan *vlan;
 935         struct hlist_head *head;
 936         unsigned short vid;
 937         uint32_t i;
 938         int last_seen_secs;
 939         int last_seen_msecs;
 940         unsigned long last_seen_jiffies;
 941         bool no_purge;
 942         uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
 943
 944         primary_if = batadv_seq_print_text_primary_if_get(seq);
 945         if (!primary_if)
 946                 goto out;
 947
 948         seq_printf(seq,
 949                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 950                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
 951         seq_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
 952                    "Flags", "Last seen", "CRC");
 953
 954         for (i = 0; i < hash->size; i++) {
 955                 head = &hash->table[i];
 956
 957                 rcu_read_lock();
 958                 hlist_for_each_entry_rcu(tt_common_entry,
 959                                          head, hash_entry) {
 960                         tt_local = container_of(tt_common_entry,
 961                                                 struct batadv_tt_local_entry,
 962                                                 common);
 963                         vid = tt_common_entry->vid;
 964                         last_seen_jiffies = jiffies - tt_local->last_seen;
 965                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 966                         last_seen_secs = last_seen_msecs / 1000;
 967                         last_seen_msecs = last_seen_msecs % 1000;
 968
 969                         no_purge = tt_common_entry->flags & np_flag;
 970
 971                         vlan = batadv_softif_vlan_get(bat_priv, vid);
 972                         if (!vlan) {
 973                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
 974                                            BATADV_PRINT_VID(vid));
 975                                 continue;
 976                         }
 977
 978                         seq_printf(seq,
 979                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 980                                    tt_common_entry->addr,
 981                                    BATADV_PRINT_VID(tt_common_entry->vid),
 982                                    ((tt_common_entry->flags &
 983                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
 984                                    no_purge ? 'P' : '.',
 985                                    ((tt_common_entry->flags &
 986                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
 987                                    ((tt_common_entry->flags &
 988                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
 989                                    ((tt_common_entry->flags &
 990                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
 991                                    ((tt_common_entry->flags &
 992                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
 993                                    no_purge ? 0 : last_seen_secs,
 994                                    no_purge ? 0 : last_seen_msecs,
 995                                    vlan->tt.crc);
 996
 997                         batadv_softif_vlan_free_ref(vlan);
 998                 }
 999                 rcu_read_unlock();
1000         }
1001 out:
1002         if (primary_if)
1003                 batadv_hardif_free_ref(primary_if);
1004         return 0;
1005 }
1006
1007 static void
1008 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1009                             struct batadv_tt_local_entry *tt_local_entry,
1010                             uint16_t flags, const char *message)
1011 {
1012         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1013
1014         /* The local client has to be marked as "pending to be removed" but has
1015          * to be kept in the table in order to send it in a full table
1016          * response issued before the net ttvn increment (consistency check)
1017          */
1018         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1019
1020         batadv_dbg(BATADV_DBG_TT, bat_priv,
1021                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1022                    tt_local_entry->common.addr,
1023                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1024 }
1025
1026 /**
1027  * batadv_tt_local_remove - logically remove an entry from the local table
1028  * @bat_priv: the bat priv with all the soft interface information
1029  * @addr: the MAC address of the client to remove
1030  * @vid: VLAN identifier
1031  * @message: message to append to the log on deletion
1032  * @roaming: true if the deletion is due to a roaming event
1033  *
1034  * Returns the flags assigned to the local entry before being deleted
1035  */
1036 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
1037                                 const uint8_t *addr, unsigned short vid,
1038                                 const char *message, bool roaming)
1039 {
1040         struct batadv_tt_local_entry *tt_local_entry;
1041         uint16_t flags, curr_flags = BATADV_NO_FLAGS;
1042         struct batadv_softif_vlan *vlan;
1043         void *tt_entry_exists;
1044
1045         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1046         if (!tt_local_entry)
1047                 goto out;
1048
1049         curr_flags = tt_local_entry->common.flags;
1050
1051         flags = BATADV_TT_CLIENT_DEL;
1052         /* if this global entry addition is due to a roaming, the node has to
1053          * mark the local entry as "roamed" in order to correctly reroute
1054          * packets later
1055          */
1056         if (roaming) {
1057                 flags |= BATADV_TT_CLIENT_ROAM;
1058                 /* mark the local client as ROAMed */
1059                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1060         }
1061
1062         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1063                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1064                                             message);
1065                 goto out;
1066         }
1067         /* if this client has been added right now, it is possible to
1068          * immediately purge it
1069          */
1070         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1071
1072         tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1073                                              batadv_compare_tt,
1074                                              batadv_choose_tt,
1075                                              &tt_local_entry->common);
1076         if (!tt_entry_exists)
1077                 goto out;
1078
1079         /* extra call to free the local tt entry */
1080         batadv_tt_local_entry_free_ref(tt_local_entry);
1081
1082         /* decrease the reference held for this vlan */
1083         vlan = batadv_softif_vlan_get(bat_priv, vid);
1084         if (!vlan)
1085                 goto out;
1086
1087         batadv_softif_vlan_free_ref(vlan);
1088         batadv_softif_vlan_free_ref(vlan);
1089
1090 out:
1091         if (tt_local_entry)
1092                 batadv_tt_local_entry_free_ref(tt_local_entry);
1093
1094         return curr_flags;
1095 }
1096
1097 /**
1098  * batadv_tt_local_purge_list - purge inactive tt local entries
1099  * @bat_priv: the bat priv with all the soft interface information
1100  * @head: pointer to the list containing the local tt entries
1101  * @timeout: parameter deciding whether a given tt local entry is considered
1102  *  inactive or not
1103  */
1104 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1105                                        struct hlist_head *head,
1106                                        int timeout)
1107 {
1108         struct batadv_tt_local_entry *tt_local_entry;
1109         struct batadv_tt_common_entry *tt_common_entry;
1110         struct hlist_node *node_tmp;
1111
1112         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1113                                   hash_entry) {
1114                 tt_local_entry = container_of(tt_common_entry,
1115                                               struct batadv_tt_local_entry,
1116                                               common);
1117                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1118                         continue;
1119
1120                 /* entry already marked for deletion */
1121                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1122                         continue;
1123
1124                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1125                         continue;
1126
1127                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1128                                             BATADV_TT_CLIENT_DEL, "timed out");
1129         }
1130 }
1131
1132 /**
1133  * batadv_tt_local_purge - purge inactive tt local entries
1134  * @bat_priv: the bat priv with all the soft interface information
1135  * @timeout: parameter deciding whether a given tt local entry is considered
1136  *  inactive or not
1137  */
1138 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1139                                   int timeout)
1140 {
1141         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1142         struct hlist_head *head;
1143         spinlock_t *list_lock; /* protects write access to the hash lists */
1144         uint32_t i;
1145
1146         for (i = 0; i < hash->size; i++) {
1147                 head = &hash->table[i];
1148                 list_lock = &hash->list_locks[i];
1149
1150                 spin_lock_bh(list_lock);
1151                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1152                 spin_unlock_bh(list_lock);
1153         }
1154 }
1155
1156 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1157 {
1158         struct batadv_hashtable *hash;
1159         spinlock_t *list_lock; /* protects write access to the hash lists */
1160         struct batadv_tt_common_entry *tt_common_entry;
1161         struct batadv_tt_local_entry *tt_local;
1162         struct batadv_softif_vlan *vlan;
1163         struct hlist_node *node_tmp;
1164         struct hlist_head *head;
1165         uint32_t i;
1166
1167         if (!bat_priv->tt.local_hash)
1168                 return;
1169
1170         hash = bat_priv->tt.local_hash;
1171
1172         for (i = 0; i < hash->size; i++) {
1173                 head = &hash->table[i];
1174                 list_lock = &hash->list_locks[i];
1175
1176                 spin_lock_bh(list_lock);
1177                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1178                                           head, hash_entry) {
1179                         hlist_del_rcu(&tt_common_entry->hash_entry);
1180                         tt_local = container_of(tt_common_entry,
1181                                                 struct batadv_tt_local_entry,
1182                                                 common);
1183
1184                         /* decrease the reference held for this vlan */
1185                         vlan = batadv_softif_vlan_get(bat_priv,
1186                                                       tt_common_entry->vid);
1187                         if (vlan) {
1188                                 batadv_softif_vlan_free_ref(vlan);
1189                                 batadv_softif_vlan_free_ref(vlan);
1190                         }
1191
1192                         batadv_tt_local_entry_free_ref(tt_local);
1193                 }
1194                 spin_unlock_bh(list_lock);
1195         }
1196
1197         batadv_hash_destroy(hash);
1198
1199         bat_priv->tt.local_hash = NULL;
1200 }
1201
1202 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1203 {
1204         if (bat_priv->tt.global_hash)
1205                 return 0;
1206
1207         bat_priv->tt.global_hash = batadv_hash_new(1024);
1208
1209         if (!bat_priv->tt.global_hash)
1210                 return -ENOMEM;
1211
1212         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1213                                    &batadv_tt_global_hash_lock_class_key);
1214
1215         return 0;
1216 }
1217
1218 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1219 {
1220         struct batadv_tt_change_node *entry, *safe;
1221
1222         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1223
1224         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1225                                  list) {
1226                 list_del(&entry->list);
1227                 kfree(entry);
1228         }
1229
1230         atomic_set(&bat_priv->tt.local_changes, 0);
1231         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1232 }
1233
1234 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1235  * batadv_tt_global_entry list
1236  *
1237  * returns it with an increased refcounter, NULL if not found
1238  */
1239 static struct batadv_tt_orig_list_entry *
1240 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1241                                  const struct batadv_orig_node *orig_node)
1242 {
1243         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1244         const struct hlist_head *head;
1245
1246         rcu_read_lock();
1247         head = &entry->orig_list;
1248         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1249                 if (tmp_orig_entry->orig_node != orig_node)
1250                         continue;
1251                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1252                         continue;
1253
1254                 orig_entry = tmp_orig_entry;
1255                 break;
1256         }
1257         rcu_read_unlock();
1258
1259         return orig_entry;
1260 }
1261
1262 /* find out if an orig_node is already in the list of a tt_global_entry.
1263  * returns true if found, false otherwise
1264  */
1265 static bool
1266 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1267                                 const struct batadv_orig_node *orig_node)
1268 {
1269         struct batadv_tt_orig_list_entry *orig_entry;
1270         bool found = false;
1271
1272         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1273         if (orig_entry) {
1274                 found = true;
1275                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1276         }
1277
1278         return found;
1279 }
1280
1281 static void
1282 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1283                                 struct batadv_orig_node *orig_node, int ttvn)
1284 {
1285         struct batadv_tt_orig_list_entry *orig_entry;
1286
1287         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1288         if (orig_entry) {
1289                 /* refresh the ttvn: the current value could be a bogus one that
1290                  * was added during a "temporary client detection"
1291                  */
1292                 orig_entry->ttvn = ttvn;
1293                 goto out;
1294         }
1295
1296         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1297         if (!orig_entry)
1298                 goto out;
1299
1300         INIT_HLIST_NODE(&orig_entry->list);
1301         atomic_inc(&orig_node->refcount);
1302         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1303         orig_entry->orig_node = orig_node;
1304         orig_entry->ttvn = ttvn;
1305         atomic_set(&orig_entry->refcount, 2);
1306
1307         spin_lock_bh(&tt_global->list_lock);
1308         hlist_add_head_rcu(&orig_entry->list,
1309                            &tt_global->orig_list);
1310         spin_unlock_bh(&tt_global->list_lock);
1311         atomic_inc(&tt_global->orig_list_count);
1312
1313 out:
1314         if (orig_entry)
1315                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1316 }
1317
1318 /**
1319  * batadv_tt_global_add - add a new TT global entry or update an existing one
1320  * @bat_priv: the bat priv with all the soft interface information
1321  * @orig_node: the originator announcing the client
1322  * @tt_addr: the mac address of the non-mesh client
1323  * @vid: VLAN identifier
1324  * @flags: TT flags that have to be set for this non-mesh client
1325  * @ttvn: the tt version number ever announcing this non-mesh client
1326  *
1327  * Add a new TT global entry for the given originator. If the entry already
1328  * exists add a new reference to the given originator (a global entry can have
1329  * references to multiple originators) and adjust the flags attribute to reflect
1330  * the function argument.
1331  * If a TT local entry exists for this non-mesh client remove it.
1332  *
1333  * The caller must hold orig_node refcount.
1334  *
1335  * Return true if the new entry has been added, false otherwise
1336  */
1337 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1338                                  struct batadv_orig_node *orig_node,
1339                                  const unsigned char *tt_addr,
1340                                  unsigned short vid, uint16_t flags,
1341                                  uint8_t ttvn)
1342 {
1343         struct batadv_tt_global_entry *tt_global_entry;
1344         struct batadv_tt_local_entry *tt_local_entry;
1345         bool ret = false;
1346         int hash_added;
1347         struct batadv_tt_common_entry *common;
1348         uint16_t local_flags;
1349
1350         /* ignore global entries from backbone nodes */
1351         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1352                 return true;
1353
1354         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1355         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1356
1357         /* if the node already has a local client for this entry, it has to wait
1358          * for a roaming advertisement instead of manually messing up the global
1359          * table
1360          */
1361         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1362             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1363                 goto out;
1364
1365         if (!tt_global_entry) {
1366                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1367                 if (!tt_global_entry)
1368                         goto out;
1369
1370                 common = &tt_global_entry->common;
1371                 ether_addr_copy(common->addr, tt_addr);
1372                 common->vid = vid;
1373
1374                 common->flags = flags;
1375                 tt_global_entry->roam_at = 0;
1376                 /* node must store current time in case of roaming. This is
1377                  * needed to purge this entry out on timeout (if nobody claims
1378                  * it)
1379                  */
1380                 if (flags & BATADV_TT_CLIENT_ROAM)
1381                         tt_global_entry->roam_at = jiffies;
1382                 atomic_set(&common->refcount, 2);
1383                 common->added_at = jiffies;
1384
1385                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1386                 atomic_set(&tt_global_entry->orig_list_count, 0);
1387                 spin_lock_init(&tt_global_entry->list_lock);
1388
1389                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1390                                              batadv_compare_tt,
1391                                              batadv_choose_tt, common,
1392                                              &common->hash_entry);
1393
1394                 if (unlikely(hash_added != 0)) {
1395                         /* remove the reference for the hash */
1396                         batadv_tt_global_entry_free_ref(tt_global_entry);
1397                         goto out_remove;
1398                 }
1399         } else {
1400                 common = &tt_global_entry->common;
1401                 /* If there is already a global entry, we can use this one for
1402                  * our processing.
1403                  * But if we are trying to add a temporary client then here are
1404                  * two options at this point:
1405                  * 1) the global client is not a temporary client: the global
1406                  *    client has to be left as it is, temporary information
1407                  *    should never override any already known client state
1408                  * 2) the global client is a temporary client: purge the
1409                  *    originator list and add the new one orig_entry
1410                  */
1411                 if (flags & BATADV_TT_CLIENT_TEMP) {
1412                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1413                                 goto out;
1414                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1415                                                             orig_node))
1416                                 goto out_remove;
1417                         batadv_tt_global_del_orig_list(tt_global_entry);
1418                         goto add_orig_entry;
1419                 }
1420
1421                 /* if the client was temporary added before receiving the first
1422                  * OGM announcing it, we have to clear the TEMP flag
1423                  */
1424                 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1425
1426                 /* the change can carry possible "attribute" flags like the
1427                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1428                  * client entry
1429                  */
1430                 tt_global_entry->common.flags |= flags;
1431
1432                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1433                  * one originator left in the list and we previously received a
1434                  * delete + roaming change for this originator.
1435                  *
1436                  * We should first delete the old originator before adding the
1437                  * new one.
1438                  */
1439                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1440                         batadv_tt_global_del_orig_list(tt_global_entry);
1441                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1442                         tt_global_entry->roam_at = 0;
1443                 }
1444         }
1445 add_orig_entry:
1446         /* add the new orig_entry (if needed) or update it */
1447         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1448
1449         batadv_dbg(BATADV_DBG_TT, bat_priv,
1450                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1451                    common->addr, BATADV_PRINT_VID(common->vid),
1452                    orig_node->orig);
1453         ret = true;
1454
1455 out_remove:
1456         /* Do not remove multicast addresses from the local hash on
1457          * global additions
1458          */
1459         if (is_multicast_ether_addr(tt_addr))
1460                 goto out;
1461
1462         /* remove address from local hash if present */
1463         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1464                                              "global tt received",
1465                                              flags & BATADV_TT_CLIENT_ROAM);
1466         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1467
1468         if (!(flags & BATADV_TT_CLIENT_ROAM))
1469                 /* this is a normal global add. Therefore the client is not in a
1470                  * roaming state anymore.
1471                  */
1472                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1473
1474 out:
1475         if (tt_global_entry)
1476                 batadv_tt_global_entry_free_ref(tt_global_entry);
1477         if (tt_local_entry)
1478                 batadv_tt_local_entry_free_ref(tt_local_entry);
1479         return ret;
1480 }
1481
1482 /**
1483  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1484  * @bat_priv: the bat priv with all the soft interface information
1485  * @tt_global_entry: global translation table entry to be analyzed
1486  *
1487  * This functon assumes the caller holds rcu_read_lock().
1488  * Returns best originator list entry or NULL on errors.
1489  */
1490 static struct batadv_tt_orig_list_entry *
1491 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1492                             struct batadv_tt_global_entry *tt_global_entry)
1493 {
1494         struct batadv_neigh_node *router, *best_router = NULL;
1495         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1496         struct hlist_head *head;
1497         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1498
1499         head = &tt_global_entry->orig_list;
1500         hlist_for_each_entry_rcu(orig_entry, head, list) {
1501                 router = batadv_orig_router_get(orig_entry->orig_node,
1502                                                 BATADV_IF_DEFAULT);
1503                 if (!router)
1504                         continue;
1505
1506                 if (best_router &&
1507                     bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1508                                        best_router, BATADV_IF_DEFAULT) <= 0) {
1509                         batadv_neigh_node_free_ref(router);
1510                         continue;
1511                 }
1512
1513                 /* release the refcount for the "old" best */
1514                 if (best_router)
1515                         batadv_neigh_node_free_ref(best_router);
1516
1517                 best_entry = orig_entry;
1518                 best_router = router;
1519         }
1520
1521         if (best_router)
1522                 batadv_neigh_node_free_ref(best_router);
1523
1524         return best_entry;
1525 }
1526
1527 /**
1528  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1529  *  for this global entry
1530  * @bat_priv: the bat priv with all the soft interface information
1531  * @tt_global_entry: global translation table entry to be printed
1532  * @seq: debugfs table seq_file struct
1533  *
1534  * This functon assumes the caller holds rcu_read_lock().
1535  */
1536 static void
1537 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1538                              struct batadv_tt_global_entry *tt_global_entry,
1539                              struct seq_file *seq)
1540 {
1541         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1542         struct batadv_tt_common_entry *tt_common_entry;
1543         struct batadv_orig_node_vlan *vlan;
1544         struct hlist_head *head;
1545         uint8_t last_ttvn;
1546         uint16_t flags;
1547
1548         tt_common_entry = &tt_global_entry->common;
1549         flags = tt_common_entry->flags;
1550
1551         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1552         if (best_entry) {
1553                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1554                                                  tt_common_entry->vid);
1555                 if (!vlan) {
1556                         seq_printf(seq,
1557                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1558                                    BATADV_PRINT_VID(tt_common_entry->vid),
1559                                    best_entry->orig_node->orig);
1560                         goto print_list;
1561                 }
1562
1563                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1564                 seq_printf(seq,
1565                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1566                            '*', tt_global_entry->common.addr,
1567                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1568                            best_entry->ttvn, best_entry->orig_node->orig,
1569                            last_ttvn, vlan->tt.crc,
1570                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1571                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1572                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1573                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1574
1575                 batadv_orig_node_vlan_free_ref(vlan);
1576         }
1577
1578 print_list:
1579         head = &tt_global_entry->orig_list;
1580
1581         hlist_for_each_entry_rcu(orig_entry, head, list) {
1582                 if (best_entry == orig_entry)
1583                         continue;
1584
1585                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1586                                                  tt_common_entry->vid);
1587                 if (!vlan) {
1588                         seq_printf(seq,
1589                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1590                                    BATADV_PRINT_VID(tt_common_entry->vid),
1591                                    orig_entry->orig_node->orig);
1592                         continue;
1593                 }
1594
1595                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1596                 seq_printf(seq,
1597                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1598                            '+', tt_global_entry->common.addr,
1599                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1600                            orig_entry->ttvn, orig_entry->orig_node->orig,
1601                            last_ttvn, vlan->tt.crc,
1602                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1603                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1604                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1605                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1606
1607                 batadv_orig_node_vlan_free_ref(vlan);
1608         }
1609 }
1610
1611 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1612 {
1613         struct net_device *net_dev = (struct net_device *)seq->private;
1614         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1615         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1616         struct batadv_tt_common_entry *tt_common_entry;
1617         struct batadv_tt_global_entry *tt_global;
1618         struct batadv_hard_iface *primary_if;
1619         struct hlist_head *head;
1620         uint32_t i;
1621
1622         primary_if = batadv_seq_print_text_primary_if_get(seq);
1623         if (!primary_if)
1624                 goto out;
1625
1626         seq_printf(seq,
1627                    "Globally announced TT entries received via the mesh %s\n",
1628                    net_dev->name);
1629         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1630                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1631                    "CRC", "Flags");
1632
1633         for (i = 0; i < hash->size; i++) {
1634                 head = &hash->table[i];
1635
1636                 rcu_read_lock();
1637                 hlist_for_each_entry_rcu(tt_common_entry,
1638                                          head, hash_entry) {
1639                         tt_global = container_of(tt_common_entry,
1640                                                  struct batadv_tt_global_entry,
1641                                                  common);
1642                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1643                 }
1644                 rcu_read_unlock();
1645         }
1646 out:
1647         if (primary_if)
1648                 batadv_hardif_free_ref(primary_if);
1649         return 0;
1650 }
1651
1652 /**
1653  * batadv_tt_global_del_orig_entry - remove and free an orig_entry
1654  * @tt_global_entry: the global entry to remove the orig_entry from
1655  * @orig_entry: the orig entry to remove and free
1656  *
1657  * Remove an orig_entry from its list in the given tt_global_entry and
1658  * free this orig_entry afterwards.
1659  */
1660 static void
1661 batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1662                                 struct batadv_tt_orig_list_entry *orig_entry)
1663 {
1664         batadv_tt_global_size_dec(orig_entry->orig_node,
1665                                   tt_global_entry->common.vid);
1666         atomic_dec(&tt_global_entry->orig_list_count);
1667         hlist_del_rcu(&orig_entry->list);
1668         batadv_tt_orig_list_entry_free_ref(orig_entry);
1669 }
1670
1671 /* deletes the orig list of a tt_global_entry */
1672 static void
1673 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1674 {
1675         struct hlist_head *head;
1676         struct hlist_node *safe;
1677         struct batadv_tt_orig_list_entry *orig_entry;
1678
1679         spin_lock_bh(&tt_global_entry->list_lock);
1680         head = &tt_global_entry->orig_list;
1681         hlist_for_each_entry_safe(orig_entry, safe, head, list)
1682                 batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1683         spin_unlock_bh(&tt_global_entry->list_lock);
1684 }
1685
1686 /**
1687  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1688  * @bat_priv: the bat priv with all the soft interface information
1689  * @tt_global_entry: the global entry to remove the orig_node from
1690  * @orig_node: the originator announcing the client
1691  * @message: message to append to the log on deletion
1692  *
1693  * Remove the given orig_node and its according orig_entry from the given
1694  * global tt entry.
1695  */
1696 static void
1697 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1698                                struct batadv_tt_global_entry *tt_global_entry,
1699                                struct batadv_orig_node *orig_node,
1700                                const char *message)
1701 {
1702         struct hlist_head *head;
1703         struct hlist_node *safe;
1704         struct batadv_tt_orig_list_entry *orig_entry;
1705         unsigned short vid;
1706
1707         spin_lock_bh(&tt_global_entry->list_lock);
1708         head = &tt_global_entry->orig_list;
1709         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1710                 if (orig_entry->orig_node == orig_node) {
1711                         vid = tt_global_entry->common.vid;
1712                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1713                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1714                                    orig_node->orig,
1715                                    tt_global_entry->common.addr,
1716                                    BATADV_PRINT_VID(vid), message);
1717                         batadv_tt_global_del_orig_entry(tt_global_entry,
1718                                                         orig_entry);
1719                 }
1720         }
1721         spin_unlock_bh(&tt_global_entry->list_lock);
1722 }
1723
1724 /* If the client is to be deleted, we check if it is the last origantor entry
1725  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1726  * timer, otherwise we simply remove the originator scheduled for deletion.
1727  */
1728 static void
1729 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1730                              struct batadv_tt_global_entry *tt_global_entry,
1731                              struct batadv_orig_node *orig_node,
1732                              const char *message)
1733 {
1734         bool last_entry = true;
1735         struct hlist_head *head;
1736         struct batadv_tt_orig_list_entry *orig_entry;
1737
1738         /* no local entry exists, case 1:
1739          * Check if this is the last one or if other entries exist.
1740          */
1741
1742         rcu_read_lock();
1743         head = &tt_global_entry->orig_list;
1744         hlist_for_each_entry_rcu(orig_entry, head, list) {
1745                 if (orig_entry->orig_node != orig_node) {
1746                         last_entry = false;
1747                         break;
1748                 }
1749         }
1750         rcu_read_unlock();
1751
1752         if (last_entry) {
1753                 /* its the last one, mark for roaming. */
1754                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1755                 tt_global_entry->roam_at = jiffies;
1756         } else
1757                 /* there is another entry, we can simply delete this
1758                  * one and can still use the other one.
1759                  */
1760                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1761                                                orig_node, message);
1762 }
1763
1764 /**
1765  * batadv_tt_global_del - remove a client from the global table
1766  * @bat_priv: the bat priv with all the soft interface information
1767  * @orig_node: an originator serving this client
1768  * @addr: the mac address of the client
1769  * @vid: VLAN identifier
1770  * @message: a message explaining the reason for deleting the client to print
1771  *  for debugging purpose
1772  * @roaming: true if the deletion has been triggered by a roaming event
1773  */
1774 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1775                                  struct batadv_orig_node *orig_node,
1776                                  const unsigned char *addr, unsigned short vid,
1777                                  const char *message, bool roaming)
1778 {
1779         struct batadv_tt_global_entry *tt_global_entry;
1780         struct batadv_tt_local_entry *local_entry = NULL;
1781
1782         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1783         if (!tt_global_entry)
1784                 goto out;
1785
1786         if (!roaming) {
1787                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1788                                                orig_node, message);
1789
1790                 if (hlist_empty(&tt_global_entry->orig_list))
1791                         batadv_tt_global_free(bat_priv, tt_global_entry,
1792                                               message);
1793
1794                 goto out;
1795         }
1796
1797         /* if we are deleting a global entry due to a roam
1798          * event, there are two possibilities:
1799          * 1) the client roamed from node A to node B => if there
1800          *    is only one originator left for this client, we mark
1801          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1802          *    wait for node B to claim it. In case of timeout
1803          *    the entry is purged.
1804          *
1805          *    If there are other originators left, we directly delete
1806          *    the originator.
1807          * 2) the client roamed to us => we can directly delete
1808          *    the global entry, since it is useless now.
1809          */
1810         local_entry = batadv_tt_local_hash_find(bat_priv,
1811                                                 tt_global_entry->common.addr,
1812                                                 vid);
1813         if (local_entry) {
1814                 /* local entry exists, case 2: client roamed to us. */
1815                 batadv_tt_global_del_orig_list(tt_global_entry);
1816                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1817         } else
1818                 /* no local entry exists, case 1: check for roaming */
1819                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1820                                              orig_node, message);
1821
1822 out:
1823         if (tt_global_entry)
1824                 batadv_tt_global_entry_free_ref(tt_global_entry);
1825         if (local_entry)
1826                 batadv_tt_local_entry_free_ref(local_entry);
1827 }
1828
1829 /**
1830  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1831  *  given originator matching the provided vid
1832  * @bat_priv: the bat priv with all the soft interface information
1833  * @orig_node: the originator owning the entries to remove
1834  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1835  *  removed
1836  * @message: debug message to print as "reason"
1837  */
1838 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1839                                struct batadv_orig_node *orig_node,
1840                                int32_t match_vid,
1841                                const char *message)
1842 {
1843         struct batadv_tt_global_entry *tt_global;
1844         struct batadv_tt_common_entry *tt_common_entry;
1845         uint32_t i;
1846         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1847         struct hlist_node *safe;
1848         struct hlist_head *head;
1849         spinlock_t *list_lock; /* protects write access to the hash lists */
1850         unsigned short vid;
1851
1852         if (!hash)
1853                 return;
1854
1855         for (i = 0; i < hash->size; i++) {
1856                 head = &hash->table[i];
1857                 list_lock = &hash->list_locks[i];
1858
1859                 spin_lock_bh(list_lock);
1860                 hlist_for_each_entry_safe(tt_common_entry, safe,
1861                                           head, hash_entry) {
1862                         /* remove only matching entries */
1863                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1864                                 continue;
1865
1866                         tt_global = container_of(tt_common_entry,
1867                                                  struct batadv_tt_global_entry,
1868                                                  common);
1869
1870                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
1871                                                        orig_node, message);
1872
1873                         if (hlist_empty(&tt_global->orig_list)) {
1874                                 vid = tt_global->common.vid;
1875                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1876                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1877                                            tt_global->common.addr,
1878                                            BATADV_PRINT_VID(vid), message);
1879                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1880                                 batadv_tt_global_entry_free_ref(tt_global);
1881                         }
1882                 }
1883                 spin_unlock_bh(list_lock);
1884         }
1885         orig_node->capa_initialized &= ~BATADV_ORIG_CAPA_HAS_TT;
1886 }
1887
1888 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1889                                       char **msg)
1890 {
1891         bool purge = false;
1892         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1893         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1894
1895         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1896             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1897                 purge = true;
1898                 *msg = "Roaming timeout\n";
1899         }
1900
1901         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1902             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1903                 purge = true;
1904                 *msg = "Temporary client timeout\n";
1905         }
1906
1907         return purge;
1908 }
1909
1910 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1911 {
1912         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1913         struct hlist_head *head;
1914         struct hlist_node *node_tmp;
1915         spinlock_t *list_lock; /* protects write access to the hash lists */
1916         uint32_t i;
1917         char *msg = NULL;
1918         struct batadv_tt_common_entry *tt_common;
1919         struct batadv_tt_global_entry *tt_global;
1920
1921         for (i = 0; i < hash->size; i++) {
1922                 head = &hash->table[i];
1923                 list_lock = &hash->list_locks[i];
1924
1925                 spin_lock_bh(list_lock);
1926                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1927                                           hash_entry) {
1928                         tt_global = container_of(tt_common,
1929                                                  struct batadv_tt_global_entry,
1930                                                  common);
1931
1932                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1933                                 continue;
1934
1935                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1936                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1937                                    tt_global->common.addr,
1938                                    BATADV_PRINT_VID(tt_global->common.vid),
1939                                    msg);
1940
1941                         hlist_del_rcu(&tt_common->hash_entry);
1942
1943                         batadv_tt_global_entry_free_ref(tt_global);
1944                 }
1945                 spin_unlock_bh(list_lock);
1946         }
1947 }
1948
1949 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1950 {
1951         struct batadv_hashtable *hash;
1952         spinlock_t *list_lock; /* protects write access to the hash lists */
1953         struct batadv_tt_common_entry *tt_common_entry;
1954         struct batadv_tt_global_entry *tt_global;
1955         struct hlist_node *node_tmp;
1956         struct hlist_head *head;
1957         uint32_t i;
1958
1959         if (!bat_priv->tt.global_hash)
1960                 return;
1961
1962         hash = bat_priv->tt.global_hash;
1963
1964         for (i = 0; i < hash->size; i++) {
1965                 head = &hash->table[i];
1966                 list_lock = &hash->list_locks[i];
1967
1968                 spin_lock_bh(list_lock);
1969                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1970                                           head, hash_entry) {
1971                         hlist_del_rcu(&tt_common_entry->hash_entry);
1972                         tt_global = container_of(tt_common_entry,
1973                                                  struct batadv_tt_global_entry,
1974                                                  common);
1975                         batadv_tt_global_entry_free_ref(tt_global);
1976                 }
1977                 spin_unlock_bh(list_lock);
1978         }
1979
1980         batadv_hash_destroy(hash);
1981
1982         bat_priv->tt.global_hash = NULL;
1983 }
1984
1985 static bool
1986 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1987                        struct batadv_tt_global_entry *tt_global_entry)
1988 {
1989         bool ret = false;
1990
1991         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1992             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1993                 ret = true;
1994
1995         /* check if the two clients are marked as isolated */
1996         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
1997             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
1998                 ret = true;
1999
2000         return ret;
2001 }
2002
2003 /**
2004  * batadv_transtable_search - get the mesh destination for a given client
2005  * @bat_priv: the bat priv with all the soft interface information
2006  * @src: mac address of the source client
2007  * @addr: mac address of the destination client
2008  * @vid: VLAN identifier
2009  *
2010  * Returns a pointer to the originator that was selected as destination in the
2011  * mesh for contacting the client 'addr', NULL otherwise.
2012  * In case of multiple originators serving the same client, the function returns
2013  * the best one (best in terms of metric towards the destination node).
2014  *
2015  * If the two clients are AP isolated the function returns NULL.
2016  */
2017 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2018                                                   const uint8_t *src,
2019                                                   const uint8_t *addr,
2020                                                   unsigned short vid)
2021 {
2022         struct batadv_tt_local_entry *tt_local_entry = NULL;
2023         struct batadv_tt_global_entry *tt_global_entry = NULL;
2024         struct batadv_orig_node *orig_node = NULL;
2025         struct batadv_tt_orig_list_entry *best_entry;
2026
2027         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2028                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2029                 if (!tt_local_entry ||
2030                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2031                         goto out;
2032         }
2033
2034         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2035         if (!tt_global_entry)
2036                 goto out;
2037
2038         /* check whether the clients should not communicate due to AP
2039          * isolation
2040          */
2041         if (tt_local_entry &&
2042             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2043                 goto out;
2044
2045         rcu_read_lock();
2046         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2047         /* found anything? */
2048         if (best_entry)
2049                 orig_node = best_entry->orig_node;
2050         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2051                 orig_node = NULL;
2052         rcu_read_unlock();
2053
2054 out:
2055         if (tt_global_entry)
2056                 batadv_tt_global_entry_free_ref(tt_global_entry);
2057         if (tt_local_entry)
2058                 batadv_tt_local_entry_free_ref(tt_local_entry);
2059
2060         return orig_node;
2061 }
2062
2063 /**
2064  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2065  *  to the given orig_node
2066  * @bat_priv: the bat priv with all the soft interface information
2067  * @orig_node: originator for which the CRC should be computed
2068  * @vid: VLAN identifier for which the CRC32 has to be computed
2069  *
2070  * This function computes the checksum for the global table corresponding to a
2071  * specific originator. In particular, the checksum is computed as follows: For
2072  * each client connected to the originator the CRC32C of the MAC address and the
2073  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2074  * together.
2075  *
2076  * The idea behind is that CRC32C should be used as much as possible in order to
2077  * produce a unique hash of the table, but since the order which is used to feed
2078  * the CRC32C function affects the result and since every node in the network
2079  * probably sorts the clients differently, the hash function cannot be directly
2080  * computed over the entire table. Hence the CRC32C is used only on
2081  * the single client entry, while all the results are then xor'ed together
2082  * because the XOR operation can combine them all while trying to reduce the
2083  * noise as much as possible.
2084  *
2085  * Returns the checksum of the global table of a given originator.
2086  */
2087 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
2088                                      struct batadv_orig_node *orig_node,
2089                                      unsigned short vid)
2090 {
2091         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2092         struct batadv_tt_common_entry *tt_common;
2093         struct batadv_tt_global_entry *tt_global;
2094         struct hlist_head *head;
2095         uint32_t i, crc_tmp, crc = 0;
2096         uint8_t flags;
2097         __be16 tmp_vid;
2098
2099         for (i = 0; i < hash->size; i++) {
2100                 head = &hash->table[i];
2101
2102                 rcu_read_lock();
2103                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2104                         tt_global = container_of(tt_common,
2105                                                  struct batadv_tt_global_entry,
2106                                                  common);
2107                         /* compute the CRC only for entries belonging to the
2108                          * VLAN identified by the vid passed as parameter
2109                          */
2110                         if (tt_common->vid != vid)
2111                                 continue;
2112
2113                         /* Roaming clients are in the global table for
2114                          * consistency only. They don't have to be
2115                          * taken into account while computing the
2116                          * global crc
2117                          */
2118                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2119                                 continue;
2120                         /* Temporary clients have not been announced yet, so
2121                          * they have to be skipped while computing the global
2122                          * crc
2123                          */
2124                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2125                                 continue;
2126
2127                         /* find out if this global entry is announced by this
2128                          * originator
2129                          */
2130                         if (!batadv_tt_global_entry_has_orig(tt_global,
2131                                                              orig_node))
2132                                 continue;
2133
2134                         /* use network order to read the VID: this ensures that
2135                          * every node reads the bytes in the same order.
2136                          */
2137                         tmp_vid = htons(tt_common->vid);
2138                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2139
2140                         /* compute the CRC on flags that have to be kept in sync
2141                          * among nodes
2142                          */
2143                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2144                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2145
2146                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2147                 }
2148                 rcu_read_unlock();
2149         }
2150
2151         return crc;
2152 }
2153
2154 /**
2155  * batadv_tt_local_crc - calculates the checksum of the local table
2156  * @bat_priv: the bat priv with all the soft interface information
2157  * @vid: VLAN identifier for which the CRC32 has to be computed
2158  *
2159  * For details about the computation, please refer to the documentation for
2160  * batadv_tt_global_crc().
2161  *
2162  * Returns the checksum of the local table
2163  */
2164 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2165                                     unsigned short vid)
2166 {
2167         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2168         struct batadv_tt_common_entry *tt_common;
2169         struct hlist_head *head;
2170         uint32_t i, crc_tmp, crc = 0;
2171         uint8_t flags;
2172         __be16 tmp_vid;
2173
2174         for (i = 0; i < hash->size; i++) {
2175                 head = &hash->table[i];
2176
2177                 rcu_read_lock();
2178                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2179                         /* compute the CRC only for entries belonging to the
2180                          * VLAN identified by vid
2181                          */
2182                         if (tt_common->vid != vid)
2183                                 continue;
2184
2185                         /* not yet committed clients have not to be taken into
2186                          * account while computing the CRC
2187                          */
2188                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2189                                 continue;
2190
2191                         /* use network order to read the VID: this ensures that
2192                          * every node reads the bytes in the same order.
2193                          */
2194                         tmp_vid = htons(tt_common->vid);
2195                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2196
2197                         /* compute the CRC on flags that have to be kept in sync
2198                          * among nodes
2199                          */
2200                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2201                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2202
2203                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2204                 }
2205                 rcu_read_unlock();
2206         }
2207
2208         return crc;
2209 }
2210
2211 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2212 {
2213         struct batadv_tt_req_node *node, *safe;
2214
2215         spin_lock_bh(&bat_priv->tt.req_list_lock);
2216
2217         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2218                 list_del(&node->list);
2219                 kfree(node);
2220         }
2221
2222         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2223 }
2224
2225 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2226                                        struct batadv_orig_node *orig_node,
2227                                        const void *tt_buff,
2228                                        uint16_t tt_buff_len)
2229 {
2230         /* Replace the old buffer only if I received something in the
2231          * last OGM (the OGM could carry no changes)
2232          */
2233         spin_lock_bh(&orig_node->tt_buff_lock);
2234         if (tt_buff_len > 0) {
2235                 kfree(orig_node->tt_buff);
2236                 orig_node->tt_buff_len = 0;
2237                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2238                 if (orig_node->tt_buff) {
2239                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2240                         orig_node->tt_buff_len = tt_buff_len;
2241                 }
2242         }
2243         spin_unlock_bh(&orig_node->tt_buff_lock);
2244 }
2245
2246 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2247 {
2248         struct batadv_tt_req_node *node, *safe;
2249
2250         spin_lock_bh(&bat_priv->tt.req_list_lock);
2251         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2252                 if (batadv_has_timed_out(node->issued_at,
2253                                          BATADV_TT_REQUEST_TIMEOUT)) {
2254                         list_del(&node->list);
2255                         kfree(node);
2256                 }
2257         }
2258         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2259 }
2260
2261 /* returns the pointer to the new tt_req_node struct if no request
2262  * has already been issued for this orig_node, NULL otherwise
2263  */
2264 static struct batadv_tt_req_node *
2265 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2266                        struct batadv_orig_node *orig_node)
2267 {
2268         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2269
2270         spin_lock_bh(&bat_priv->tt.req_list_lock);
2271         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2272                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2273                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2274                                           BATADV_TT_REQUEST_TIMEOUT))
2275                         goto unlock;
2276         }
2277
2278         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2279         if (!tt_req_node)
2280                 goto unlock;
2281
2282         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2283         tt_req_node->issued_at = jiffies;
2284
2285         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2286 unlock:
2287         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2288         return tt_req_node;
2289 }
2290
2291 /**
2292  * batadv_tt_local_valid - verify that given tt entry is a valid one
2293  * @entry_ptr: to be checked local tt entry
2294  * @data_ptr: not used but definition required to satisfy the callback prototype
2295  *
2296  * Returns 1 if the entry is a valid, 0 otherwise.
2297  */
2298 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2299 {
2300         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2301
2302         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2303                 return 0;
2304         return 1;
2305 }
2306
2307 static int batadv_tt_global_valid(const void *entry_ptr,
2308                                   const void *data_ptr)
2309 {
2310         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2311         const struct batadv_tt_global_entry *tt_global_entry;
2312         const struct batadv_orig_node *orig_node = data_ptr;
2313
2314         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2315             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2316                 return 0;
2317
2318         tt_global_entry = container_of(tt_common_entry,
2319                                        struct batadv_tt_global_entry,
2320                                        common);
2321
2322         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2323 }
2324
2325 /**
2326  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2327  *  specified tt hash
2328  * @bat_priv: the bat priv with all the soft interface information
2329  * @hash: hash table containing the tt entries
2330  * @tt_len: expected tvlv tt data buffer length in number of bytes
2331  * @tvlv_buff: pointer to the buffer to fill with the TT data
2332  * @valid_cb: function to filter tt change entries
2333  * @cb_data: data passed to the filter function as argument
2334  */
2335 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2336                                     struct batadv_hashtable *hash,
2337                                     void *tvlv_buff, uint16_t tt_len,
2338                                     int (*valid_cb)(const void *, const void *),
2339                                     void *cb_data)
2340 {
2341         struct batadv_tt_common_entry *tt_common_entry;
2342         struct batadv_tvlv_tt_change *tt_change;
2343         struct hlist_head *head;
2344         uint16_t tt_tot, tt_num_entries = 0;
2345         uint32_t i;
2346
2347         tt_tot = batadv_tt_entries(tt_len);
2348         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2349
2350         rcu_read_lock();
2351         for (i = 0; i < hash->size; i++) {
2352                 head = &hash->table[i];
2353
2354                 hlist_for_each_entry_rcu(tt_common_entry,
2355                                          head, hash_entry) {
2356                         if (tt_tot == tt_num_entries)
2357                                 break;
2358
2359                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2360                                 continue;
2361
2362                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2363                         tt_change->flags = tt_common_entry->flags;
2364                         tt_change->vid = htons(tt_common_entry->vid);
2365                         memset(tt_change->reserved, 0,
2366                                sizeof(tt_change->reserved));
2367
2368                         tt_num_entries++;
2369                         tt_change++;
2370                 }
2371         }
2372         rcu_read_unlock();
2373 }
2374
2375 /**
2376  * batadv_tt_global_check_crc - check if all the CRCs are correct
2377  * @orig_node: originator for which the CRCs have to be checked
2378  * @tt_vlan: pointer to the first tvlv VLAN entry
2379  * @num_vlan: number of tvlv VLAN entries
2380  * @create: if true, create VLAN objects if not found
2381  *
2382  * Return true if all the received CRCs match the locally stored ones, false
2383  * otherwise
2384  */
2385 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2386                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2387                                        uint16_t num_vlan)
2388 {
2389         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2390         struct batadv_orig_node_vlan *vlan;
2391         uint32_t crc;
2392         int i;
2393
2394         /* check if each received CRC matches the locally stored one */
2395         for (i = 0; i < num_vlan; i++) {
2396                 tt_vlan_tmp = tt_vlan + i;
2397
2398                 /* if orig_node is a backbone node for this VLAN, don't check
2399                  * the CRC as we ignore all the global entries over it
2400                  */
2401                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2402                                                    orig_node->orig,
2403                                                    ntohs(tt_vlan_tmp->vid)))
2404                         continue;
2405
2406                 vlan = batadv_orig_node_vlan_get(orig_node,
2407                                                  ntohs(tt_vlan_tmp->vid));
2408                 if (!vlan)
2409                         return false;
2410
2411                 crc = vlan->tt.crc;
2412                 batadv_orig_node_vlan_free_ref(vlan);
2413
2414                 if (crc != ntohl(tt_vlan_tmp->crc))
2415                         return false;
2416         }
2417
2418         return true;
2419 }
2420
2421 /**
2422  * batadv_tt_local_update_crc - update all the local CRCs
2423  * @bat_priv: the bat priv with all the soft interface information
2424  */
2425 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2426 {
2427         struct batadv_softif_vlan *vlan;
2428
2429         /* recompute the global CRC for each VLAN */
2430         rcu_read_lock();
2431         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2432                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2433         }
2434         rcu_read_unlock();
2435 }
2436
2437 /**
2438  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2439  * @bat_priv: the bat priv with all the soft interface information
2440  * @orig_node: the orig_node for which the CRCs have to be updated
2441  */
2442 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2443                                         struct batadv_orig_node *orig_node)
2444 {
2445         struct batadv_orig_node_vlan *vlan;
2446         uint32_t crc;
2447
2448         /* recompute the global CRC for each VLAN */
2449         rcu_read_lock();
2450         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2451                 /* if orig_node is a backbone node for this VLAN, don't compute
2452                  * the CRC as we ignore all the global entries over it
2453                  */
2454                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2455                                                    vlan->vid))
2456                         continue;
2457
2458                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2459                 vlan->tt.crc = crc;
2460         }
2461         rcu_read_unlock();
2462 }
2463
2464 /**
2465  * batadv_send_tt_request - send a TT Request message to a given node
2466  * @bat_priv: the bat priv with all the soft interface information
2467  * @dst_orig_node: the destination of the message
2468  * @ttvn: the version number that the source of the message is looking for
2469  * @tt_vlan: pointer to the first tvlv VLAN object to request
2470  * @num_vlan: number of tvlv VLAN entries
2471  * @full_table: ask for the entire translation table if true, while only for the
2472  *  last TT diff otherwise
2473  */
2474 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2475                                   struct batadv_orig_node *dst_orig_node,
2476                                   uint8_t ttvn,
2477                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2478                                   uint16_t num_vlan, bool full_table)
2479 {
2480         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2481         struct batadv_tt_req_node *tt_req_node = NULL;
2482         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2483         struct batadv_hard_iface *primary_if;
2484         bool ret = false;
2485         int i, size;
2486
2487         primary_if = batadv_primary_if_get_selected(bat_priv);
2488         if (!primary_if)
2489                 goto out;
2490
2491         /* The new tt_req will be issued only if I'm not waiting for a
2492          * reply from the same orig_node yet
2493          */
2494         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2495         if (!tt_req_node)
2496                 goto out;
2497
2498         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2499         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2500         if (!tvlv_tt_data)
2501                 goto out;
2502
2503         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2504         tvlv_tt_data->ttvn = ttvn;
2505         tvlv_tt_data->num_vlan = htons(num_vlan);
2506
2507         /* send all the CRCs within the request. This is needed by intermediate
2508          * nodes to ensure they have the correct table before replying
2509          */
2510         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2511         for (i = 0; i < num_vlan; i++) {
2512                 tt_vlan_req->vid = tt_vlan->vid;
2513                 tt_vlan_req->crc = tt_vlan->crc;
2514
2515                 tt_vlan_req++;
2516                 tt_vlan++;
2517         }
2518
2519         if (full_table)
2520                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2521
2522         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2523                    dst_orig_node->orig, full_table ? 'F' : '.');
2524
2525         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2526         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2527                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2528                                  tvlv_tt_data, size);
2529         ret = true;
2530
2531 out:
2532         if (primary_if)
2533                 batadv_hardif_free_ref(primary_if);
2534         if (ret && tt_req_node) {
2535                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2536                 list_del(&tt_req_node->list);
2537                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2538                 kfree(tt_req_node);
2539         }
2540         kfree(tvlv_tt_data);
2541         return ret;
2542 }
2543
2544 /**
2545  * batadv_send_other_tt_response - send reply to tt request concerning another
2546  *  node's translation table
2547  * @bat_priv: the bat priv with all the soft interface information
2548  * @tt_data: tt data containing the tt request information
2549  * @req_src: mac address of tt request sender
2550  * @req_dst: mac address of tt request recipient
2551  *
2552  * Returns true if tt request reply was sent, false otherwise.
2553  */
2554 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2555                                           struct batadv_tvlv_tt_data *tt_data,
2556                                           uint8_t *req_src, uint8_t *req_dst)
2557 {
2558         struct batadv_orig_node *req_dst_orig_node;
2559         struct batadv_orig_node *res_dst_orig_node = NULL;
2560         struct batadv_tvlv_tt_change *tt_change;
2561         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2562         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2563         bool ret = false, full_table;
2564         uint8_t orig_ttvn, req_ttvn;
2565         uint16_t tvlv_len;
2566         int32_t tt_len;
2567
2568         batadv_dbg(BATADV_DBG_TT, bat_priv,
2569                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2570                    req_src, tt_data->ttvn, req_dst,
2571                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2572
2573         /* Let's get the orig node of the REAL destination */
2574         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2575         if (!req_dst_orig_node)
2576                 goto out;
2577
2578         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2579         if (!res_dst_orig_node)
2580                 goto out;
2581
2582         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2583         req_ttvn = tt_data->ttvn;
2584
2585         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2586         /* this node doesn't have the requested data */
2587         if (orig_ttvn != req_ttvn ||
2588             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2589                                         ntohs(tt_data->num_vlan)))
2590                 goto out;
2591
2592         /* If the full table has been explicitly requested */
2593         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2594             !req_dst_orig_node->tt_buff)
2595                 full_table = true;
2596         else
2597                 full_table = false;
2598
2599         /* TT fragmentation hasn't been implemented yet, so send as many
2600          * TT entries fit a single packet as possible only
2601          */
2602         if (!full_table) {
2603                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2604                 tt_len = req_dst_orig_node->tt_buff_len;
2605
2606                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2607                                                               &tvlv_tt_data,
2608                                                               &tt_change,
2609                                                               &tt_len);
2610                 if (!tt_len)
2611                         goto unlock;
2612
2613                 /* Copy the last orig_node's OGM buffer */
2614                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2615                        req_dst_orig_node->tt_buff_len);
2616                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2617         } else {
2618                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2619                  * in the initial part
2620                  */
2621                 tt_len = -1;
2622                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2623                                                               &tvlv_tt_data,
2624                                                               &tt_change,
2625                                                               &tt_len);
2626                 if (!tt_len)
2627                         goto out;
2628
2629                 /* fill the rest of the tvlv with the real TT entries */
2630                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2631                                         tt_change, tt_len,
2632                                         batadv_tt_global_valid,
2633                                         req_dst_orig_node);
2634         }
2635
2636         /* Don't send the response, if larger than fragmented packet. */
2637         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2638         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2639                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2640                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2641                                          res_dst_orig_node->orig);
2642                 goto out;
2643         }
2644
2645         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2646         tvlv_tt_data->ttvn = req_ttvn;
2647
2648         if (full_table)
2649                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2650
2651         batadv_dbg(BATADV_DBG_TT, bat_priv,
2652                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2653                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2654                    full_table ? 'F' : '.', req_ttvn);
2655
2656         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2657
2658         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2659                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2660                                  tvlv_len);
2661
2662         ret = true;
2663         goto out;
2664
2665 unlock:
2666         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2667
2668 out:
2669         if (res_dst_orig_node)
2670                 batadv_orig_node_free_ref(res_dst_orig_node);
2671         if (req_dst_orig_node)
2672                 batadv_orig_node_free_ref(req_dst_orig_node);
2673         kfree(tvlv_tt_data);
2674         return ret;
2675 }
2676
2677 /**
2678  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2679  *  translation table
2680  * @bat_priv: the bat priv with all the soft interface information
2681  * @tt_data: tt data containing the tt request information
2682  * @req_src: mac address of tt request sender
2683  *
2684  * Returns true if tt request reply was sent, false otherwise.
2685  */
2686 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2687                                        struct batadv_tvlv_tt_data *tt_data,
2688                                        uint8_t *req_src)
2689 {
2690         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2691         struct batadv_hard_iface *primary_if = NULL;
2692         struct batadv_tvlv_tt_change *tt_change;
2693         struct batadv_orig_node *orig_node;
2694         uint8_t my_ttvn, req_ttvn;
2695         uint16_t tvlv_len;
2696         bool full_table;
2697         int32_t tt_len;
2698
2699         batadv_dbg(BATADV_DBG_TT, bat_priv,
2700                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2701                    req_src, tt_data->ttvn,
2702                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2703
2704         spin_lock_bh(&bat_priv->tt.commit_lock);
2705
2706         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2707         req_ttvn = tt_data->ttvn;
2708
2709         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2710         if (!orig_node)
2711                 goto out;
2712
2713         primary_if = batadv_primary_if_get_selected(bat_priv);
2714         if (!primary_if)
2715                 goto out;
2716
2717         /* If the full table has been explicitly requested or the gap
2718          * is too big send the whole local translation table
2719          */
2720         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2721             !bat_priv->tt.last_changeset)
2722                 full_table = true;
2723         else
2724                 full_table = false;
2725
2726         /* TT fragmentation hasn't been implemented yet, so send as many
2727          * TT entries fit a single packet as possible only
2728          */
2729         if (!full_table) {
2730                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2731
2732                 tt_len = bat_priv->tt.last_changeset_len;
2733                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2734                                                              &tvlv_tt_data,
2735                                                              &tt_change,
2736                                                              &tt_len);
2737                 if (!tt_len)
2738                         goto unlock;
2739
2740                 /* Copy the last orig_node's OGM buffer */
2741                 memcpy(tt_change, bat_priv->tt.last_changeset,
2742                        bat_priv->tt.last_changeset_len);
2743                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2744         } else {
2745                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2746
2747                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2748                  * in the initial part
2749                  */
2750                 tt_len = -1;
2751                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2752                                                              &tvlv_tt_data,
2753                                                              &tt_change,
2754                                                              &tt_len);
2755                 if (!tt_len)
2756                         goto out;
2757
2758                 /* fill the rest of the tvlv with the real TT entries */
2759                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2760                                         tt_change, tt_len,
2761                                         batadv_tt_local_valid, NULL);
2762         }
2763
2764         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2765         tvlv_tt_data->ttvn = req_ttvn;
2766
2767         if (full_table)
2768                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2769
2770         batadv_dbg(BATADV_DBG_TT, bat_priv,
2771                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2772                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2773
2774         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2775
2776         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2777                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2778                                  tvlv_len);
2779
2780         goto out;
2781
2782 unlock:
2783         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2784 out:
2785         spin_unlock_bh(&bat_priv->tt.commit_lock);
2786         if (orig_node)
2787                 batadv_orig_node_free_ref(orig_node);
2788         if (primary_if)
2789                 batadv_hardif_free_ref(primary_if);
2790         kfree(tvlv_tt_data);
2791         /* The packet was for this host, so it doesn't need to be re-routed */
2792         return true;
2793 }
2794
2795 /**
2796  * batadv_send_tt_response - send reply to tt request
2797  * @bat_priv: the bat priv with all the soft interface information
2798  * @tt_data: tt data containing the tt request information
2799  * @req_src: mac address of tt request sender
2800  * @req_dst: mac address of tt request recipient
2801  *
2802  * Returns true if tt request reply was sent, false otherwise.
2803  */
2804 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2805                                     struct batadv_tvlv_tt_data *tt_data,
2806                                     uint8_t *req_src, uint8_t *req_dst)
2807 {
2808         if (batadv_is_my_mac(bat_priv, req_dst))
2809                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2810         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2811                                              req_dst);
2812 }
2813
2814 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2815                                       struct batadv_orig_node *orig_node,
2816                                       struct batadv_tvlv_tt_change *tt_change,
2817                                       uint16_t tt_num_changes, uint8_t ttvn)
2818 {
2819         int i;
2820         int roams;
2821
2822         for (i = 0; i < tt_num_changes; i++) {
2823                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2824                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2825                         batadv_tt_global_del(bat_priv, orig_node,
2826                                              (tt_change + i)->addr,
2827                                              ntohs((tt_change + i)->vid),
2828                                              "tt removed by changes",
2829                                              roams);
2830                 } else {
2831                         if (!batadv_tt_global_add(bat_priv, orig_node,
2832                                                   (tt_change + i)->addr,
2833                                                   ntohs((tt_change + i)->vid),
2834                                                   (tt_change + i)->flags, ttvn))
2835                                 /* In case of problem while storing a
2836                                  * global_entry, we stop the updating
2837                                  * procedure without committing the
2838                                  * ttvn change. This will avoid to send
2839                                  * corrupted data on tt_request
2840                                  */
2841                                 return;
2842                 }
2843         }
2844         orig_node->capa_initialized |= BATADV_ORIG_CAPA_HAS_TT;
2845 }
2846
2847 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2848                                   struct batadv_tvlv_tt_change *tt_change,
2849                                   uint8_t ttvn, uint8_t *resp_src,
2850                                   uint16_t num_entries)
2851 {
2852         struct batadv_orig_node *orig_node;
2853
2854         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2855         if (!orig_node)
2856                 goto out;
2857
2858         /* Purge the old table first.. */
2859         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2860                                   "Received full table");
2861
2862         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2863                                   ttvn);
2864
2865         spin_lock_bh(&orig_node->tt_buff_lock);
2866         kfree(orig_node->tt_buff);
2867         orig_node->tt_buff_len = 0;
2868         orig_node->tt_buff = NULL;
2869         spin_unlock_bh(&orig_node->tt_buff_lock);
2870
2871         atomic_set(&orig_node->last_ttvn, ttvn);
2872
2873 out:
2874         if (orig_node)
2875                 batadv_orig_node_free_ref(orig_node);
2876 }
2877
2878 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2879                                      struct batadv_orig_node *orig_node,
2880                                      uint16_t tt_num_changes, uint8_t ttvn,
2881                                      struct batadv_tvlv_tt_change *tt_change)
2882 {
2883         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2884                                   tt_num_changes, ttvn);
2885
2886         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2887                                    batadv_tt_len(tt_num_changes));
2888         atomic_set(&orig_node->last_ttvn, ttvn);
2889 }
2890
2891 /**
2892  * batadv_is_my_client - check if a client is served by the local node
2893  * @bat_priv: the bat priv with all the soft interface information
2894  * @addr: the mac address of the client to check
2895  * @vid: VLAN identifier
2896  *
2897  * Returns true if the client is served by this node, false otherwise.
2898  */
2899 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2900                          unsigned short vid)
2901 {
2902         struct batadv_tt_local_entry *tt_local_entry;
2903         bool ret = false;
2904
2905         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2906         if (!tt_local_entry)
2907                 goto out;
2908         /* Check if the client has been logically deleted (but is kept for
2909          * consistency purpose)
2910          */
2911         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2912             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2913                 goto out;
2914         ret = true;
2915 out:
2916         if (tt_local_entry)
2917                 batadv_tt_local_entry_free_ref(tt_local_entry);
2918         return ret;
2919 }
2920
2921 /**
2922  * batadv_handle_tt_response - process incoming tt reply
2923  * @bat_priv: the bat priv with all the soft interface information
2924  * @tt_data: tt data containing the tt request information
2925  * @resp_src: mac address of tt reply sender
2926  * @num_entries: number of tt change entries appended to the tt data
2927  */
2928 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2929                                       struct batadv_tvlv_tt_data *tt_data,
2930                                       uint8_t *resp_src, uint16_t num_entries)
2931 {
2932         struct batadv_tt_req_node *node, *safe;
2933         struct batadv_orig_node *orig_node = NULL;
2934         struct batadv_tvlv_tt_change *tt_change;
2935         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2936         uint16_t change_offset;
2937
2938         batadv_dbg(BATADV_DBG_TT, bat_priv,
2939                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2940                    resp_src, tt_data->ttvn, num_entries,
2941                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2942
2943         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2944         if (!orig_node)
2945                 goto out;
2946
2947         spin_lock_bh(&orig_node->tt_lock);
2948
2949         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2950         change_offset *= ntohs(tt_data->num_vlan);
2951         change_offset += sizeof(*tt_data);
2952         tvlv_ptr += change_offset;
2953
2954         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2955         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2956                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2957                                       resp_src, num_entries);
2958         } else {
2959                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2960                                          tt_data->ttvn, tt_change);
2961         }
2962
2963         /* Recalculate the CRC for this orig_node and store it */
2964         batadv_tt_global_update_crc(bat_priv, orig_node);
2965
2966         spin_unlock_bh(&orig_node->tt_lock);
2967
2968         /* Delete the tt_req_node from pending tt_requests list */
2969         spin_lock_bh(&bat_priv->tt.req_list_lock);
2970         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2971                 if (!batadv_compare_eth(node->addr, resp_src))
2972                         continue;
2973                 list_del(&node->list);
2974                 kfree(node);
2975         }
2976
2977         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2978 out:
2979         if (orig_node)
2980                 batadv_orig_node_free_ref(orig_node);
2981 }
2982
2983 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2984 {
2985         struct batadv_tt_roam_node *node, *safe;
2986
2987         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2988
2989         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2990                 list_del(&node->list);
2991                 kfree(node);
2992         }
2993
2994         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2995 }
2996
2997 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2998 {
2999         struct batadv_tt_roam_node *node, *safe;
3000
3001         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3002         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3003                 if (!batadv_has_timed_out(node->first_time,
3004                                           BATADV_ROAMING_MAX_TIME))
3005                         continue;
3006
3007                 list_del(&node->list);
3008                 kfree(node);
3009         }
3010         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3011 }
3012
3013 /* This function checks whether the client already reached the
3014  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3015  * will not be sent.
3016  *
3017  * returns true if the ROAMING_ADV can be sent, false otherwise
3018  */
3019 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
3020                                        uint8_t *client)
3021 {
3022         struct batadv_tt_roam_node *tt_roam_node;
3023         bool ret = false;
3024
3025         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3026         /* The new tt_req will be issued only if I'm not waiting for a
3027          * reply from the same orig_node yet
3028          */
3029         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3030                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3031                         continue;
3032
3033                 if (batadv_has_timed_out(tt_roam_node->first_time,
3034                                          BATADV_ROAMING_MAX_TIME))
3035                         continue;
3036
3037                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3038                         /* Sorry, you roamed too many times! */
3039                         goto unlock;
3040                 ret = true;
3041                 break;
3042         }
3043
3044         if (!ret) {
3045                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3046                 if (!tt_roam_node)
3047                         goto unlock;
3048
3049                 tt_roam_node->first_time = jiffies;
3050                 atomic_set(&tt_roam_node->counter,
3051                            BATADV_ROAMING_MAX_COUNT - 1);
3052                 ether_addr_copy(tt_roam_node->addr, client);
3053
3054                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3055                 ret = true;
3056         }
3057
3058 unlock:
3059         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3060         return ret;
3061 }
3062
3063 /**
3064  * batadv_send_roam_adv - send a roaming advertisement message
3065  * @bat_priv: the bat priv with all the soft interface information
3066  * @client: mac address of the roaming client
3067  * @vid: VLAN identifier
3068  * @orig_node: message destination
3069  *
3070  * Send a ROAMING_ADV message to the node which was previously serving this
3071  * client. This is done to inform the node that from now on all traffic destined
3072  * for this particular roamed client has to be forwarded to the sender of the
3073  * roaming message.
3074  */
3075 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
3076                                  unsigned short vid,
3077                                  struct batadv_orig_node *orig_node)
3078 {
3079         struct batadv_hard_iface *primary_if;
3080         struct batadv_tvlv_roam_adv tvlv_roam;
3081
3082         primary_if = batadv_primary_if_get_selected(bat_priv);
3083         if (!primary_if)
3084                 goto out;
3085
3086         /* before going on we have to check whether the client has
3087          * already roamed to us too many times
3088          */
3089         if (!batadv_tt_check_roam_count(bat_priv, client))
3090                 goto out;
3091
3092         batadv_dbg(BATADV_DBG_TT, bat_priv,
3093                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3094                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3095
3096         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3097
3098         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3099         tvlv_roam.vid = htons(vid);
3100
3101         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3102                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3103                                  &tvlv_roam, sizeof(tvlv_roam));
3104
3105 out:
3106         if (primary_if)
3107                 batadv_hardif_free_ref(primary_if);
3108 }
3109
3110 static void batadv_tt_purge(struct work_struct *work)
3111 {
3112         struct delayed_work *delayed_work;
3113         struct batadv_priv_tt *priv_tt;
3114         struct batadv_priv *bat_priv;
3115
3116         delayed_work = container_of(work, struct delayed_work, work);
3117         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3118         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3119
3120         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3121         batadv_tt_global_purge(bat_priv);
3122         batadv_tt_req_purge(bat_priv);
3123         batadv_tt_roam_purge(bat_priv);
3124
3125         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3126                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3127 }
3128
3129 void batadv_tt_free(struct batadv_priv *bat_priv)
3130 {
3131         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3132         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3133
3134         cancel_delayed_work_sync(&bat_priv->tt.work);
3135
3136         batadv_tt_local_table_free(bat_priv);
3137         batadv_tt_global_table_free(bat_priv);
3138         batadv_tt_req_list_free(bat_priv);
3139         batadv_tt_changes_list_free(bat_priv);
3140         batadv_tt_roam_list_free(bat_priv);
3141
3142         kfree(bat_priv->tt.last_changeset);
3143 }
3144
3145 /**
3146  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3147  *  table and possibly count them in the TT size
3148  * @bat_priv: the bat priv with all the soft interface information
3149  * @flags: the flag to switch
3150  * @enable: whether to set or unset the flag
3151  * @count: whether to increase the TT size by the number of changed entries
3152  */
3153 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3154                                       uint16_t flags, bool enable, bool count)
3155 {
3156         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3157         struct batadv_tt_common_entry *tt_common_entry;
3158         uint16_t changed_num = 0;
3159         struct hlist_head *head;
3160         uint32_t i;
3161
3162         if (!hash)
3163                 return;
3164
3165         for (i = 0; i < hash->size; i++) {
3166                 head = &hash->table[i];
3167
3168                 rcu_read_lock();
3169                 hlist_for_each_entry_rcu(tt_common_entry,
3170                                          head, hash_entry) {
3171                         if (enable) {
3172                                 if ((tt_common_entry->flags & flags) == flags)
3173                                         continue;
3174                                 tt_common_entry->flags |= flags;
3175                         } else {
3176                                 if (!(tt_common_entry->flags & flags))
3177                                         continue;
3178                                 tt_common_entry->flags &= ~flags;
3179                         }
3180                         changed_num++;
3181
3182                         if (!count)
3183                                 continue;
3184
3185                         batadv_tt_local_size_inc(bat_priv,
3186                                                  tt_common_entry->vid);
3187                 }
3188                 rcu_read_unlock();
3189         }
3190 }
3191
3192 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3193 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3194 {
3195         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3196         struct batadv_tt_common_entry *tt_common;
3197         struct batadv_tt_local_entry *tt_local;
3198         struct batadv_softif_vlan *vlan;
3199         struct hlist_node *node_tmp;
3200         struct hlist_head *head;
3201         spinlock_t *list_lock; /* protects write access to the hash lists */
3202         uint32_t i;
3203
3204         if (!hash)
3205                 return;
3206
3207         for (i = 0; i < hash->size; i++) {
3208                 head = &hash->table[i];
3209                 list_lock = &hash->list_locks[i];
3210
3211                 spin_lock_bh(list_lock);
3212                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3213                                           hash_entry) {
3214                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3215                                 continue;
3216
3217                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3218                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3219                                    tt_common->addr,
3220                                    BATADV_PRINT_VID(tt_common->vid));
3221
3222                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3223                         hlist_del_rcu(&tt_common->hash_entry);
3224                         tt_local = container_of(tt_common,
3225                                                 struct batadv_tt_local_entry,
3226                                                 common);
3227
3228                         /* decrease the reference held for this vlan */
3229                         vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3230                         if (vlan) {
3231                                 batadv_softif_vlan_free_ref(vlan);
3232                                 batadv_softif_vlan_free_ref(vlan);
3233                         }
3234
3235                         batadv_tt_local_entry_free_ref(tt_local);
3236                 }
3237                 spin_unlock_bh(list_lock);
3238         }
3239 }
3240
3241 /**
3242  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3243  *  which have been queued in the time since the last commit
3244  * @bat_priv: the bat priv with all the soft interface information
3245  *
3246  * Caller must hold tt->commit_lock.
3247  */
3248 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3249 {
3250         /* Update multicast addresses in local translation table */
3251         batadv_mcast_mla_update(bat_priv);
3252
3253         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3254                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3255                         batadv_tt_tvlv_container_update(bat_priv);
3256                 return;
3257         }
3258
3259         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3260
3261         batadv_tt_local_purge_pending_clients(bat_priv);
3262         batadv_tt_local_update_crc(bat_priv);
3263
3264         /* Increment the TTVN only once per OGM interval */
3265         atomic_inc(&bat_priv->tt.vn);
3266         batadv_dbg(BATADV_DBG_TT, bat_priv,
3267                    "Local changes committed, updating to ttvn %u\n",
3268                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3269
3270         /* reset the sending counter */
3271         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3272         batadv_tt_tvlv_container_update(bat_priv);
3273 }
3274
3275 /**
3276  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3277  *  have been queued in the time since the last commit
3278  * @bat_priv: the bat priv with all the soft interface information
3279  */
3280 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3281 {
3282         spin_lock_bh(&bat_priv->tt.commit_lock);
3283         batadv_tt_local_commit_changes_nolock(bat_priv);
3284         spin_unlock_bh(&bat_priv->tt.commit_lock);
3285 }
3286
3287 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3288                            uint8_t *dst, unsigned short vid)
3289 {
3290         struct batadv_tt_local_entry *tt_local_entry = NULL;
3291         struct batadv_tt_global_entry *tt_global_entry = NULL;
3292         struct batadv_softif_vlan *vlan;
3293         bool ret = false;
3294
3295         vlan = batadv_softif_vlan_get(bat_priv, vid);
3296         if (!vlan || !atomic_read(&vlan->ap_isolation))
3297                 goto out;
3298
3299         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3300         if (!tt_local_entry)
3301                 goto out;
3302
3303         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3304         if (!tt_global_entry)
3305                 goto out;
3306
3307         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3308                 goto out;
3309
3310         ret = true;
3311
3312 out:
3313         if (vlan)
3314                 batadv_softif_vlan_free_ref(vlan);
3315         if (tt_global_entry)
3316                 batadv_tt_global_entry_free_ref(tt_global_entry);
3317         if (tt_local_entry)
3318                 batadv_tt_local_entry_free_ref(tt_local_entry);
3319         return ret;
3320 }
3321
3322 /**
3323  * batadv_tt_update_orig - update global translation table with new tt
3324  *  information received via ogms
3325  * @bat_priv: the bat priv with all the soft interface information
3326  * @orig: the orig_node of the ogm
3327  * @tt_vlan: pointer to the first tvlv VLAN entry
3328  * @tt_num_vlan: number of tvlv VLAN entries
3329  * @tt_change: pointer to the first entry in the TT buffer
3330  * @tt_num_changes: number of tt changes inside the tt buffer
3331  * @ttvn: translation table version number of this changeset
3332  * @tt_crc: crc32 checksum of orig node's translation table
3333  */
3334 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3335                                   struct batadv_orig_node *orig_node,
3336                                   const void *tt_buff, uint16_t tt_num_vlan,
3337                                   struct batadv_tvlv_tt_change *tt_change,
3338                                   uint16_t tt_num_changes, uint8_t ttvn)
3339 {
3340         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3341         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3342         bool full_table = true;
3343         bool has_tt_init;
3344
3345         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3346         has_tt_init = orig_node->capa_initialized & BATADV_ORIG_CAPA_HAS_TT;
3347
3348         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3349          * increased by one -> we can apply the attached changes
3350          */
3351         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3352                 /* the OGM could not contain the changes due to their size or
3353                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3354                  * times.
3355                  * In this case send a tt request
3356                  */
3357                 if (!tt_num_changes) {
3358                         full_table = false;
3359                         goto request_table;
3360                 }
3361
3362                 spin_lock_bh(&orig_node->tt_lock);
3363
3364                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3365                                          ttvn, tt_change);
3366
3367                 /* Even if we received the precomputed crc with the OGM, we
3368                  * prefer to recompute it to spot any possible inconsistency
3369                  * in the global table
3370                  */
3371                 batadv_tt_global_update_crc(bat_priv, orig_node);
3372
3373                 spin_unlock_bh(&orig_node->tt_lock);
3374
3375                 /* The ttvn alone is not enough to guarantee consistency
3376                  * because a single value could represent different states
3377                  * (due to the wrap around). Thus a node has to check whether
3378                  * the resulting table (after applying the changes) is still
3379                  * consistent or not. E.g. a node could disconnect while its
3380                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3381                  * checking the CRC value is mandatory to detect the
3382                  * inconsistency
3383                  */
3384                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3385                                                 tt_num_vlan))
3386                         goto request_table;
3387         } else {
3388                 /* if we missed more than one change or our tables are not
3389                  * in sync anymore -> request fresh tt data
3390                  */
3391                 if (!has_tt_init || ttvn != orig_ttvn ||
3392                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3393                                                 tt_num_vlan)) {
3394 request_table:
3395                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3396                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3397                                    orig_node->orig, ttvn, orig_ttvn,
3398                                    tt_num_changes);
3399                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3400                                                tt_vlan, tt_num_vlan,
3401                                                full_table);
3402                         return;
3403                 }
3404         }
3405 }
3406
3407 /**
3408  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3409  * @bat_priv: the bat priv with all the soft interface information
3410  * @addr: the mac address of the client to check
3411  * @vid: VLAN identifier
3412  *
3413  * Returns true if we know that the client has moved from its old originator
3414  * to another one. This entry is still kept for consistency purposes and will be
3415  * deleted later by a DEL or because of timeout
3416  */
3417 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3418                                         uint8_t *addr, unsigned short vid)
3419 {
3420         struct batadv_tt_global_entry *tt_global_entry;
3421         bool ret = false;
3422
3423         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3424         if (!tt_global_entry)
3425                 goto out;
3426
3427         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3428         batadv_tt_global_entry_free_ref(tt_global_entry);
3429 out:
3430         return ret;
3431 }
3432
3433 /**
3434  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3435  * @bat_priv: the bat priv with all the soft interface information
3436  * @addr: the mac address of the local client to query
3437  * @vid: VLAN identifier
3438  *
3439  * Returns true if the local client is known to be roaming (it is not served by
3440  * this node anymore) or not. If yes, the client is still present in the table
3441  * to keep the latter consistent with the node TTVN
3442  */
3443 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3444                                        uint8_t *addr, unsigned short vid)
3445 {
3446         struct batadv_tt_local_entry *tt_local_entry;
3447         bool ret = false;
3448
3449         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3450         if (!tt_local_entry)
3451                 goto out;
3452
3453         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3454         batadv_tt_local_entry_free_ref(tt_local_entry);
3455 out:
3456         return ret;
3457 }
3458
3459 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3460                                           struct batadv_orig_node *orig_node,
3461                                           const unsigned char *addr,
3462                                           unsigned short vid)
3463 {
3464         bool ret = false;
3465
3466         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3467                                   BATADV_TT_CLIENT_TEMP,
3468                                   atomic_read(&orig_node->last_ttvn)))
3469                 goto out;
3470
3471         batadv_dbg(BATADV_DBG_TT, bat_priv,
3472                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3473                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3474         ret = true;
3475 out:
3476         return ret;
3477 }
3478
3479 /**
3480  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3481  *  maximum packet size that can be transported through the mesh
3482  * @soft_iface: netdev struct of the mesh interface
3483  *
3484  * Remove entries older than 'timeout' and half timeout if more entries need
3485  * to be removed.
3486  */
3487 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3488 {
3489         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3490         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3491         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3492         bool reduced = false;
3493
3494         spin_lock_bh(&bat_priv->tt.commit_lock);
3495
3496         while (true) {
3497                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3498                 if (packet_size_max >= table_size)
3499                         break;
3500
3501                 batadv_tt_local_purge(bat_priv, timeout);
3502                 batadv_tt_local_purge_pending_clients(bat_priv);
3503
3504                 timeout /= 2;
3505                 reduced = true;
3506                 net_ratelimited_function(batadv_info, soft_iface,
3507                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3508                                          packet_size_max);
3509         }
3510
3511         /* commit these changes immediately, to avoid synchronization problem
3512          * with the TTVN
3513          */
3514         if (reduced)
3515                 batadv_tt_local_commit_changes_nolock(bat_priv);
3516
3517         spin_unlock_bh(&bat_priv->tt.commit_lock);
3518 }
3519
3520 /**
3521  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3522  * @bat_priv: the bat priv with all the soft interface information
3523  * @orig: the orig_node of the ogm
3524  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3525  * @tvlv_value: tvlv buffer containing the gateway data
3526  * @tvlv_value_len: tvlv buffer length
3527  */
3528 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3529                                           struct batadv_orig_node *orig,
3530                                           uint8_t flags, void *tvlv_value,
3531                                           uint16_t tvlv_value_len)
3532 {
3533         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3534         struct batadv_tvlv_tt_change *tt_change;
3535         struct batadv_tvlv_tt_data *tt_data;
3536         uint16_t num_entries, num_vlan;
3537
3538         if (tvlv_value_len < sizeof(*tt_data))
3539                 return;
3540
3541         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3542         tvlv_value_len -= sizeof(*tt_data);
3543
3544         num_vlan = ntohs(tt_data->num_vlan);
3545
3546         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3547                 return;
3548
3549         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3550         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3551         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3552
3553         num_entries = batadv_tt_entries(tvlv_value_len);
3554
3555         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3556                               num_entries, tt_data->ttvn);
3557 }
3558
3559 /**
3560  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3561  *  container
3562  * @bat_priv: the bat priv with all the soft interface information
3563  * @src: mac address of tt tvlv sender
3564  * @dst: mac address of tt tvlv recipient
3565  * @tvlv_value: tvlv buffer containing the tt data
3566  * @tvlv_value_len: tvlv buffer length
3567  *
3568  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3569  * otherwise.
3570  */
3571 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3572                                              uint8_t *src, uint8_t *dst,
3573                                              void *tvlv_value,
3574                                              uint16_t tvlv_value_len)
3575 {
3576         struct batadv_tvlv_tt_data *tt_data;
3577         uint16_t tt_vlan_len, tt_num_entries;
3578         char tt_flag;
3579         bool ret;
3580
3581         if (tvlv_value_len < sizeof(*tt_data))
3582                 return NET_RX_SUCCESS;
3583
3584         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3585         tvlv_value_len -= sizeof(*tt_data);
3586
3587         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3588         tt_vlan_len *= ntohs(tt_data->num_vlan);
3589
3590         if (tvlv_value_len < tt_vlan_len)
3591                 return NET_RX_SUCCESS;
3592
3593         tvlv_value_len -= tt_vlan_len;
3594         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3595
3596         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3597         case BATADV_TT_REQUEST:
3598                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3599
3600                 /* If this node cannot provide a TT response the tt_request is
3601                  * forwarded
3602                  */
3603                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3604                 if (!ret) {
3605                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3606                                 tt_flag = 'F';
3607                         else
3608                                 tt_flag = '.';
3609
3610                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3611                                    "Routing TT_REQUEST to %pM [%c]\n",
3612                                    dst, tt_flag);
3613                         /* tvlv API will re-route the packet */
3614                         return NET_RX_DROP;
3615                 }
3616                 break;
3617         case BATADV_TT_RESPONSE:
3618                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3619
3620                 if (batadv_is_my_mac(bat_priv, dst)) {
3621                         batadv_handle_tt_response(bat_priv, tt_data,
3622                                                   src, tt_num_entries);
3623                         return NET_RX_SUCCESS;
3624                 }
3625
3626                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3627                         tt_flag =  'F';
3628                 else
3629                         tt_flag = '.';
3630
3631                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3632                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3633
3634                 /* tvlv API will re-route the packet */
3635                 return NET_RX_DROP;
3636         }
3637
3638         return NET_RX_SUCCESS;
3639 }
3640
3641 /**
3642  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3643  * @bat_priv: the bat priv with all the soft interface information
3644  * @src: mac address of tt tvlv sender
3645  * @dst: mac address of tt tvlv recipient
3646  * @tvlv_value: tvlv buffer containing the tt data
3647  * @tvlv_value_len: tvlv buffer length
3648  *
3649  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3650  * otherwise.
3651  */
3652 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3653                                                uint8_t *src, uint8_t *dst,
3654                                                void *tvlv_value,
3655                                                uint16_t tvlv_value_len)
3656 {
3657         struct batadv_tvlv_roam_adv *roaming_adv;
3658         struct batadv_orig_node *orig_node = NULL;
3659
3660         /* If this node is not the intended recipient of the
3661          * roaming advertisement the packet is forwarded
3662          * (the tvlv API will re-route the packet).
3663          */
3664         if (!batadv_is_my_mac(bat_priv, dst))
3665                 return NET_RX_DROP;
3666
3667         if (tvlv_value_len < sizeof(*roaming_adv))
3668                 goto out;
3669
3670         orig_node = batadv_orig_hash_find(bat_priv, src);
3671         if (!orig_node)
3672                 goto out;
3673
3674         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3675         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3676
3677         batadv_dbg(BATADV_DBG_TT, bat_priv,
3678                    "Received ROAMING_ADV from %pM (client %pM)\n",
3679                    src, roaming_adv->client);
3680
3681         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3682                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3683                              atomic_read(&orig_node->last_ttvn) + 1);
3684
3685 out:
3686         if (orig_node)
3687                 batadv_orig_node_free_ref(orig_node);
3688         return NET_RX_SUCCESS;
3689 }
3690
3691 /**
3692  * batadv_tt_init - initialise the translation table internals
3693  * @bat_priv: the bat priv with all the soft interface information
3694  *
3695  * Return 0 on success or negative error number in case of failure.
3696  */
3697 int batadv_tt_init(struct batadv_priv *bat_priv)
3698 {
3699         int ret;
3700
3701         /* synchronized flags must be remote */
3702         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3703
3704         ret = batadv_tt_local_init(bat_priv);
3705         if (ret < 0)
3706                 return ret;
3707
3708         ret = batadv_tt_global_init(bat_priv);
3709         if (ret < 0)
3710                 return ret;
3711
3712         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3713                                      batadv_tt_tvlv_unicast_handler_v1,
3714                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3715
3716         batadv_tvlv_handler_register(bat_priv, NULL,
3717                                      batadv_roam_tvlv_unicast_handler_v1,
3718                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3719
3720         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3721         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3722                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3723
3724         return 1;
3725 }
3726
3727 /**
3728  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3729  * @bat_priv: the bat priv with all the soft interface information
3730  * @addr: the mac address of the client
3731  * @vid: the identifier of the VLAN where this client is connected
3732  *
3733  * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3734  * otherwise
3735  */
3736 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3737                                   const uint8_t *addr, unsigned short vid)
3738 {
3739         struct batadv_tt_global_entry *tt;
3740         bool ret;
3741
3742         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3743         if (!tt)
3744                 return false;
3745
3746         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3747
3748         batadv_tt_global_entry_free_ref(tt);
3749
3750         return ret;
3751 }