net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2016  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/bitops.h>
  23 #include <linux/bug.h>
  24 #include <linux/byteorder/generic.h>
  25 #include <linux/cache.h>
  26 #include <linux/compiler.h>
  27 #include <linux/crc32c.h>
  28 #include <linux/errno.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/fs.h>
  31 #include <linux/if_ether.h>
  32 #include <linux/init.h>
  33 #include <linux/jhash.h>
  34 #include <linux/jiffies.h>
  35 #include <linux/kernel.h>
  36 #include <linux/kref.h>
  37 #include <linux/list.h>
  38 #include <linux/lockdep.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/netlink.h>
  41 #include <linux/rculist.h>
  42 #include <linux/rcupdate.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/slab.h>
  46 #include <linux/spinlock.h>
  47 #include <linux/stddef.h>
  48 #include <linux/string.h>
  49 #include <linux/workqueue.h>
  50 #include <net/genetlink.h>
  51 #include <net/netlink.h>
  52 #include <net/sock.h>
  53 #include <uapi/linux/batman_adv.h>
  54
  55 #include "bridge_loop_avoidance.h"
  56 #include "hard-interface.h"
  57 #include "hash.h"
  58 #include "log.h"
  59 #include "multicast.h"
  60 #include "netlink.h"
  61 #include "originator.h"
  62 #include "packet.h"
  63 #include "soft-interface.h"
  64 #include "tvlv.h"
  65
  66 static struct kmem_cache *batadv_tl_cache __read_mostly;
  67 static struct kmem_cache *batadv_tg_cache __read_mostly;
  68 static struct kmem_cache *batadv_tt_orig_cache __read_mostly;
  69 static struct kmem_cache *batadv_tt_change_cache __read_mostly;
  70 static struct kmem_cache *batadv_tt_req_cache __read_mostly;
  71 static struct kmem_cache *batadv_tt_roam_cache __read_mostly;
  72
  73 /* hash class keys */
  74 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  75 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  76
  77 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
  78                                  unsigned short vid,
  79                                  struct batadv_orig_node *orig_node);
  80 static void batadv_tt_purge(struct work_struct *work);
  81 static void
  82 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  83 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  84                                  struct batadv_orig_node *orig_node,
  85                                  const unsigned char *addr,
  86                                  unsigned short vid, const char *message,
  87                                  bool roaming);
  88
  89 /**
  90  * batadv_compare_tt - check if two TT entries are the same
  91  * @node: the list element pointer of the first TT entry
  92  * @data2: pointer to the tt_common_entry of the second TT entry
  93  *
  94  * Compare the MAC address and the VLAN ID of the two TT entries and check if
  95  * they are the same TT client.
  96  * Return: true if the two TT clients are the same, false otherwise
  97  */
  98 static bool batadv_compare_tt(const struct hlist_node *node, const void *data2)
  99 {
 100         const void *data1 = container_of(node, struct batadv_tt_common_entry,
 101                                          hash_entry);
 102         const struct batadv_tt_common_entry *tt1 = data1;
 103         const struct batadv_tt_common_entry *tt2 = data2;
 104
 105         return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
 106 }
 107
 108 /**
 109  * batadv_choose_tt - return the index of the tt entry in the hash table
 110  * @data: pointer to the tt_common_entry object to map
 111  * @size: the size of the hash table
 112  *
 113  * Return: the hash index where the object represented by 'data' should be
 114  * stored at.
 115  */
 116 static inline u32 batadv_choose_tt(const void *data, u32 size)
 117 {
 118         struct batadv_tt_common_entry *tt;
 119         u32 hash = 0;
 120
 121         tt = (struct batadv_tt_common_entry *)data;
 122         hash = jhash(&tt->addr, ETH_ALEN, hash);
 123         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
 124
 125         return hash % size;
 126 }
 127
 128 /**
 129  * batadv_tt_hash_find - look for a client in the given hash table
 130  * @hash: the hash table to search
 131  * @addr: the mac address of the client to look for
 132  * @vid: VLAN identifier
 133  *
 134  * Return: a pointer to the tt_common struct belonging to the searched client if
 135  * found, NULL otherwise.
 136  */
 137 static struct batadv_tt_common_entry *
 138 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
 139                     unsigned short vid)
 140 {
 141         struct hlist_head *head;
 142         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 143         u32 index;
 144
 145         if (!hash)
 146                 return NULL;
 147
 148         ether_addr_copy(to_search.addr, addr);
 149         to_search.vid = vid;
 150
 151         index = batadv_choose_tt(&to_search, hash->size);
 152         head = &hash->table[index];
 153
 154         rcu_read_lock();
 155         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 156                 if (!batadv_compare_eth(tt, addr))
 157                         continue;
 158
 159                 if (tt->vid != vid)
 160                         continue;
 161
 162                 if (!kref_get_unless_zero(&tt->refcount))
 163                         continue;
 164
 165                 tt_tmp = tt;
 166                 break;
 167         }
 168         rcu_read_unlock();
 169
 170         return tt_tmp;
 171 }
 172
 173 /**
 174  * batadv_tt_local_hash_find - search the local table for a given client
 175  * @bat_priv: the bat priv with all the soft interface information
 176  * @addr: the mac address of the client to look for
 177  * @vid: VLAN identifier
 178  *
 179  * Return: a pointer to the corresponding tt_local_entry struct if the client is
 180  * found, NULL otherwise.
 181  */
 182 static struct batadv_tt_local_entry *
 183 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 184                           unsigned short vid)
 185 {
 186         struct batadv_tt_common_entry *tt_common_entry;
 187         struct batadv_tt_local_entry *tt_local_entry = NULL;
 188
 189         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 190                                               vid);
 191         if (tt_common_entry)
 192                 tt_local_entry = container_of(tt_common_entry,
 193                                               struct batadv_tt_local_entry,
 194                                               common);
 195         return tt_local_entry;
 196 }
 197
 198 /**
 199  * batadv_tt_global_hash_find - search the global table for a given client
 200  * @bat_priv: the bat priv with all the soft interface information
 201  * @addr: the mac address of the client to look for
 202  * @vid: VLAN identifier
 203  *
 204  * Return: a pointer to the corresponding tt_global_entry struct if the client
 205  * is found, NULL otherwise.
 206  */
 207 static struct batadv_tt_global_entry *
 208 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 209                            unsigned short vid)
 210 {
 211         struct batadv_tt_common_entry *tt_common_entry;
 212         struct batadv_tt_global_entry *tt_global_entry = NULL;
 213
 214         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 215                                               vid);
 216         if (tt_common_entry)
 217                 tt_global_entry = container_of(tt_common_entry,
 218                                                struct batadv_tt_global_entry,
 219                                                common);
 220         return tt_global_entry;
 221 }
 222
 223 /**
 224  * batadv_tt_local_entry_free_rcu - free the tt_local_entry
 225  * @rcu: rcu pointer of the tt_local_entry
 226  */
 227 static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
 228 {
 229         struct batadv_tt_local_entry *tt_local_entry;
 230
 231         tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
 232                                       common.rcu);
 233
 234         kmem_cache_free(batadv_tl_cache, tt_local_entry);
 235 }
 236
 237 /**
 238  * batadv_tt_local_entry_release - release tt_local_entry from lists and queue
 239  *  for free after rcu grace period
 240  * @ref: kref pointer of the nc_node
 241  */
 242 static void batadv_tt_local_entry_release(struct kref *ref)
 243 {
 244         struct batadv_tt_local_entry *tt_local_entry;
 245
 246         tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
 247                                       common.refcount);
 248
 249         batadv_softif_vlan_put(tt_local_entry->vlan);
 250
 251         call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu);
 252 }
 253
 254 /**
 255  * batadv_tt_local_entry_put - decrement the tt_local_entry refcounter and
 256  *  possibly release it
 257  * @tt_local_entry: tt_local_entry to be free'd
 258  */
 259 static void
 260 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
 261 {
 262         kref_put(&tt_local_entry->common.refcount,
 263                  batadv_tt_local_entry_release);
 264 }
 265
 266 /**
 267  * batadv_tt_global_entry_free_rcu - free the tt_global_entry
 268  * @rcu: rcu pointer of the tt_global_entry
 269  */
 270 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
 271 {
 272         struct batadv_tt_global_entry *tt_global_entry;
 273
 274         tt_global_entry = container_of(rcu, struct batadv_tt_global_entry,
 275                                        common.rcu);
 276
 277         kmem_cache_free(batadv_tg_cache, tt_global_entry);
 278 }
 279
 280 /**
 281  * batadv_tt_global_entry_release - release tt_global_entry from lists and queue
 282  *  for free after rcu grace period
 283  * @ref: kref pointer of the nc_node
 284  */
 285 static void batadv_tt_global_entry_release(struct kref *ref)
 286 {
 287         struct batadv_tt_global_entry *tt_global_entry;
 288
 289         tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
 290                                        common.refcount);
 291
 292         batadv_tt_global_del_orig_list(tt_global_entry);
 293
 294         call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu);
 295 }
 296
 297 /**
 298  * batadv_tt_global_entry_put - decrement the tt_global_entry refcounter and
 299  *  possibly release it
 300  * @tt_global_entry: tt_global_entry to be free'd
 301  */
 302 static void
 303 batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
 304 {
 305         kref_put(&tt_global_entry->common.refcount,
 306                  batadv_tt_global_entry_release);
 307 }
 308
 309 /**
 310  * batadv_tt_global_hash_count - count the number of orig entries
 311  * @bat_priv: the bat priv with all the soft interface information
 312  * @addr: the mac address of the client to count entries for
 313  * @vid: VLAN identifier
 314  *
 315  * Return: the number of originators advertising the given address/data
 316  * (excluding ourself).
 317  */
 318 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
 319                                 const u8 *addr, unsigned short vid)
 320 {
 321         struct batadv_tt_global_entry *tt_global_entry;
 322         int count;
 323
 324         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 325         if (!tt_global_entry)
 326                 return 0;
 327
 328         count = atomic_read(&tt_global_entry->orig_list_count);
 329         batadv_tt_global_entry_put(tt_global_entry);
 330
 331         return count;
 332 }
 333
 334 /**
 335  * batadv_tt_local_size_mod - change the size by v of the local table identified
 336  *  by vid
 337  * @bat_priv: the bat priv with all the soft interface information
 338  * @vid: the VLAN identifier of the sub-table to change
 339  * @v: the amount to sum to the local table size
 340  */
 341 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 342                                      unsigned short vid, int v)
 343 {
 344         struct batadv_softif_vlan *vlan;
 345
 346         vlan = batadv_softif_vlan_get(bat_priv, vid);
 347         if (!vlan)
 348                 return;
 349
 350         atomic_add(v, &vlan->tt.num_entries);
 351
 352         batadv_softif_vlan_put(vlan);
 353 }
 354
 355 /**
 356  * batadv_tt_local_size_inc - increase by one the local table size for the given
 357  *  vid
 358  * @bat_priv: the bat priv with all the soft interface information
 359  * @vid: the VLAN identifier
 360  */
 361 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 362                                      unsigned short vid)
 363 {
 364         batadv_tt_local_size_mod(bat_priv, vid, 1);
 365 }
 366
 367 /**
 368  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 369  *  vid
 370  * @bat_priv: the bat priv with all the soft interface information
 371  * @vid: the VLAN identifier
 372  */
 373 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 374                                      unsigned short vid)
 375 {
 376         batadv_tt_local_size_mod(bat_priv, vid, -1);
 377 }
 378
 379 /**
 380  * batadv_tt_global_size_mod - change the size by v of the global table
 381  *  for orig_node identified by vid
 382  * @orig_node: the originator for which the table has to be modified
 383  * @vid: the VLAN identifier
 384  * @v: the amount to sum to the global table size
 385  */
 386 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 387                                       unsigned short vid, int v)
 388 {
 389         struct batadv_orig_node_vlan *vlan;
 390
 391         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 392         if (!vlan)
 393                 return;
 394
 395         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 396                 spin_lock_bh(&orig_node->vlan_list_lock);
 397                 if (!hlist_unhashed(&vlan->list)) {
 398                         hlist_del_init_rcu(&vlan->list);
 399                         batadv_orig_node_vlan_put(vlan);
 400                 }
 401                 spin_unlock_bh(&orig_node->vlan_list_lock);
 402         }
 403
 404         batadv_orig_node_vlan_put(vlan);
 405 }
 406
 407 /**
 408  * batadv_tt_global_size_inc - increase by one the global table size for the
 409  *  given vid
 410  * @orig_node: the originator which global table size has to be decreased
 411  * @vid: the vlan identifier
 412  */
 413 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 414                                       unsigned short vid)
 415 {
 416         batadv_tt_global_size_mod(orig_node, vid, 1);
 417 }
 418
 419 /**
 420  * batadv_tt_global_size_dec - decrease by one the global table size for the
 421  *  given vid
 422  * @orig_node: the originator which global table size has to be decreased
 423  * @vid: the vlan identifier
 424  */
 425 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 426                                       unsigned short vid)
 427 {
 428         batadv_tt_global_size_mod(orig_node, vid, -1);
 429 }
 430
 431 /**
 432  * batadv_tt_orig_list_entry_free_rcu - free the orig_entry
 433  * @rcu: rcu pointer of the orig_entry
 434  */
 435 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 436 {
 437         struct batadv_tt_orig_list_entry *orig_entry;
 438
 439         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 440
 441         kmem_cache_free(batadv_tt_orig_cache, orig_entry);
 442 }
 443
 444 /**
 445  * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
 446  *  queue for free after rcu grace period
 447  * @ref: kref pointer of the tt orig entry
 448  */
 449 static void batadv_tt_orig_list_entry_release(struct kref *ref)
 450 {
 451         struct batadv_tt_orig_list_entry *orig_entry;
 452
 453         orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
 454                                   refcount);
 455
 456         batadv_orig_node_put(orig_entry->orig_node);
 457         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 458 }
 459
 460 /**
 461  * batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and
 462  *  possibly release it
 463  * @orig_entry: tt orig entry to be free'd
 464  */
 465 static void
 466 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
 467 {
 468         kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
 469 }
 470
 471 /**
 472  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 473  * @bat_priv: the bat priv with all the soft interface information
 474  * @tt_local_entry: the TT entry involved in the event
 475  * @event_flags: flags to store in the event structure
 476  */
 477 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 478                                   struct batadv_tt_local_entry *tt_local_entry,
 479                                   u8 event_flags)
 480 {
 481         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 482         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 483         u8 flags = common->flags | event_flags;
 484         bool event_removed = false;
 485         bool del_op_requested, del_op_entry;
 486
 487         tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC);
 488         if (!tt_change_node)
 489                 return;
 490
 491         tt_change_node->change.flags = flags;
 492         memset(tt_change_node->change.reserved, 0,
 493                sizeof(tt_change_node->change.reserved));
 494         ether_addr_copy(tt_change_node->change.addr, common->addr);
 495         tt_change_node->change.vid = htons(common->vid);
 496
 497         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 498
 499         /* check for ADD+DEL or DEL+ADD events */
 500         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 501         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 502                                  list) {
 503                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 504                         continue;
 505
 506                 /* DEL+ADD in the same orig interval have no effect and can be
 507                  * removed to avoid silly behaviour on the receiver side. The
 508                  * other way around (ADD+DEL) can happen in case of roaming of
 509                  * a client still in the NEW state. Roaming of NEW clients is
 510                  * now possible due to automatically recognition of "temporary"
 511                  * clients
 512                  */
 513                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 514                 if (!del_op_requested && del_op_entry)
 515                         goto del;
 516                 if (del_op_requested && !del_op_entry)
 517                         goto del;
 518
 519                 /* this is a second add in the same originator interval. It
 520                  * means that flags have been changed: update them!
 521                  */
 522                 if (!del_op_requested && !del_op_entry)
 523                         entry->change.flags = flags;
 524
 525                 continue;
 526 del:
 527                 list_del(&entry->list);
 528                 kmem_cache_free(batadv_tt_change_cache, entry);
 529                 kmem_cache_free(batadv_tt_change_cache, tt_change_node);
 530                 event_removed = true;
 531                 goto unlock;
 532         }
 533
 534         /* track the change in the OGMinterval list */
 535         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 536
 537 unlock:
 538         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 539
 540         if (event_removed)
 541                 atomic_dec(&bat_priv->tt.local_changes);
 542         else
 543                 atomic_inc(&bat_priv->tt.local_changes);
 544 }
 545
 546 /**
 547  * batadv_tt_len - compute length in bytes of given number of tt changes
 548  * @changes_num: number of tt changes
 549  *
 550  * Return: computed length in bytes.
 551  */
 552 static int batadv_tt_len(int changes_num)
 553 {
 554         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 555 }
 556
 557 /**
 558  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 559  * @tt_len: available space
 560  *
 561  * Return: the number of entries.
 562  */
 563 static u16 batadv_tt_entries(u16 tt_len)
 564 {
 565         return tt_len / batadv_tt_len(1);
 566 }
 567
 568 /**
 569  * batadv_tt_local_table_transmit_size - calculates the local translation table
 570  *  size when transmitted over the air
 571  * @bat_priv: the bat priv with all the soft interface information
 572  *
 573  * Return: local translation table size in bytes.
 574  */
 575 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 576 {
 577         u16 num_vlan = 0;
 578         u16 tt_local_entries = 0;
 579         struct batadv_softif_vlan *vlan;
 580         int hdr_size;
 581
 582         rcu_read_lock();
 583         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 584                 num_vlan++;
 585                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 586         }
 587         rcu_read_unlock();
 588
 589         /* header size of tvlv encapsulated tt response payload */
 590         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 591         hdr_size += sizeof(struct batadv_tvlv_hdr);
 592         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 593         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 594
 595         return hdr_size + batadv_tt_len(tt_local_entries);
 596 }
 597
 598 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 599 {
 600         if (bat_priv->tt.local_hash)
 601                 return 0;
 602
 603         bat_priv->tt.local_hash = batadv_hash_new(1024);
 604
 605         if (!bat_priv->tt.local_hash)
 606                 return -ENOMEM;
 607
 608         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 609                                    &batadv_tt_local_hash_lock_class_key);
 610
 611         return 0;
 612 }
 613
 614 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 615                                   struct batadv_tt_global_entry *tt_global,
 616                                   const char *message)
 617 {
 618         batadv_dbg(BATADV_DBG_TT, bat_priv,
 619                    "Deleting global tt entry %pM (vid: %d): %s\n",
 620                    tt_global->common.addr,
 621                    BATADV_PRINT_VID(tt_global->common.vid), message);
 622
 623         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 624                            batadv_choose_tt, &tt_global->common);
 625         batadv_tt_global_entry_put(tt_global);
 626 }
 627
 628 /**
 629  * batadv_tt_local_add - add a new client to the local table or update an
 630  *  existing client
 631  * @soft_iface: netdev struct of the mesh interface
 632  * @addr: the mac address of the client to add
 633  * @vid: VLAN identifier
 634  * @ifindex: index of the interface where the client is connected to (useful to
 635  *  identify wireless clients)
 636  * @mark: the value contained in the skb->mark field of the received packet (if
 637  *  any)
 638  *
 639  * Return: true if the client was successfully added, false otherwise.
 640  */
 641 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
 642                          unsigned short vid, int ifindex, u32 mark)
 643 {
 644         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 645         struct batadv_tt_local_entry *tt_local;
 646         struct batadv_tt_global_entry *tt_global = NULL;
 647         struct net *net = dev_net(soft_iface);
 648         struct batadv_softif_vlan *vlan;
 649         struct net_device *in_dev = NULL;
 650         struct hlist_head *head;
 651         struct batadv_tt_orig_list_entry *orig_entry;
 652         int hash_added, table_size, packet_size_max;
 653         bool ret = false;
 654         bool roamed_back = false;
 655         u8 remote_flags;
 656         u32 match_mark;
 657
 658         if (ifindex != BATADV_NULL_IFINDEX)
 659                 in_dev = dev_get_by_index(net, ifindex);
 660
 661         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 662
 663         if (!is_multicast_ether_addr(addr))
 664                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 665
 666         if (tt_local) {
 667                 tt_local->last_seen = jiffies;
 668                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 669                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 670                                    "Re-adding pending client %pM (vid: %d)\n",
 671                                    addr, BATADV_PRINT_VID(vid));
 672                         /* whatever the reason why the PENDING flag was set,
 673                          * this is a client which was enqueued to be removed in
 674                          * this orig_interval. Since it popped up again, the
 675                          * flag can be reset like it was never enqueued
 676                          */
 677                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 678                         goto add_event;
 679                 }
 680
 681                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 682                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 683                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 684                                    addr, BATADV_PRINT_VID(vid));
 685                         /* the ROAM flag is set because this client roamed away
 686                          * and the node got a roaming_advertisement message. Now
 687                          * that the client popped up again at its original
 688                          * location such flag can be unset
 689                          */
 690                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 691                         roamed_back = true;
 692                 }
 693                 goto check_roaming;
 694         }
 695
 696         /* Ignore the client if we cannot send it in a full table response. */
 697         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 698         table_size += batadv_tt_len(1);
 699         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 700         if (table_size > packet_size_max) {
 701                 net_ratelimited_function(batadv_info, soft_iface,
 702                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 703                                          table_size, packet_size_max, addr);
 704                 goto out;
 705         }
 706
 707         tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
 708         if (!tt_local)
 709                 goto out;
 710
 711         /* increase the refcounter of the related vlan */
 712         vlan = batadv_softif_vlan_get(bat_priv, vid);
 713         if (!vlan) {
 714                 net_ratelimited_function(batadv_info, soft_iface,
 715                                          "adding TT local entry %pM to non-existent VLAN %d\n",
 716                                          addr, BATADV_PRINT_VID(vid));
 717                 kmem_cache_free(batadv_tl_cache, tt_local);
 718                 tt_local = NULL;
 719                 goto out;
 720         }
 721
 722         batadv_dbg(BATADV_DBG_TT, bat_priv,
 723                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 724                    addr, BATADV_PRINT_VID(vid),
 725                    (u8)atomic_read(&bat_priv->tt.vn));
 726
 727         ether_addr_copy(tt_local->common.addr, addr);
 728         /* The local entry has to be marked as NEW to avoid to send it in
 729          * a full table response going out before the next ttvn increment
 730          * (consistency check)
 731          */
 732         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 733         tt_local->common.vid = vid;
 734         if (batadv_is_wifi_netdev(in_dev))
 735                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 736         kref_init(&tt_local->common.refcount);
 737         kref_get(&tt_local->common.refcount);
 738         tt_local->last_seen = jiffies;
 739         tt_local->common.added_at = tt_local->last_seen;
 740         tt_local->vlan = vlan;
 741
 742         /* the batman interface mac and multicast addresses should never be
 743          * purged
 744          */
 745         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
 746             is_multicast_ether_addr(addr))
 747                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 748
 749         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 750                                      batadv_choose_tt, &tt_local->common,
 751                                      &tt_local->common.hash_entry);
 752
 753         if (unlikely(hash_added != 0)) {
 754                 /* remove the reference for the hash */
 755                 batadv_tt_local_entry_put(tt_local);
 756                 goto out;
 757         }
 758
 759 add_event:
 760         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 761
 762 check_roaming:
 763         /* Check whether it is a roaming, but don't do anything if the roaming
 764          * process has already been handled
 765          */
 766         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 767                 /* These node are probably going to update their tt table */
 768                 head = &tt_global->orig_list;
 769                 rcu_read_lock();
 770                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 771                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 772                                              tt_global->common.vid,
 773                                              orig_entry->orig_node);
 774                 }
 775                 rcu_read_unlock();
 776                 if (roamed_back) {
 777                         batadv_tt_global_free(bat_priv, tt_global,
 778                                               "Roaming canceled");
 779                         tt_global = NULL;
 780                 } else {
 781                         /* The global entry has to be marked as ROAMING and
 782                          * has to be kept for consistency purpose
 783                          */
 784                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 785                         tt_global->roam_at = jiffies;
 786                 }
 787         }
 788
 789         /* store the current remote flags before altering them. This helps
 790          * understanding is flags are changing or not
 791          */
 792         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 793
 794         if (batadv_is_wifi_netdev(in_dev))
 795                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 796         else
 797                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 798
 799         /* check the mark in the skb: if it's equal to the configured
 800          * isolation_mark, it means the packet is coming from an isolated
 801          * non-mesh client
 802          */
 803         match_mark = (mark & bat_priv->isolation_mark_mask);
 804         if (bat_priv->isolation_mark_mask &&
 805             match_mark == bat_priv->isolation_mark)
 806                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 807         else
 808                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 809
 810         /* if any "dynamic" flag has been modified, resend an ADD event for this
 811          * entry so that all the nodes can get the new flags
 812          */
 813         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 814                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 815
 816         ret = true;
 817 out:
 818         if (in_dev)
 819                 dev_put(in_dev);
 820         if (tt_local)
 821                 batadv_tt_local_entry_put(tt_local);
 822         if (tt_global)
 823                 batadv_tt_global_entry_put(tt_global);
 824         return ret;
 825 }
 826
 827 /**
 828  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 829  *  within a TT Response directed to another node
 830  * @orig_node: originator for which the TT data has to be prepared
 831  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 832  * @tt_change: uninitialised pointer to the address of the area where the TT
 833  *  changed can be stored
 834  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 835  *  function reserves the amount of space needed to send the entire global TT
 836  *  table. In case of success the value is updated with the real amount of
 837  *  reserved bytes
 838  * Allocate the needed amount of memory for the entire TT TVLV and write its
 839  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 840  * objects, one per active VLAN served by the originator node.
 841  *
 842  * Return: the size of the allocated buffer or 0 in case of failure.
 843  */
 844 static u16
 845 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 846                                    struct batadv_tvlv_tt_data **tt_data,
 847                                    struct batadv_tvlv_tt_change **tt_change,
 848                                    s32 *tt_len)
 849 {
 850         u16 num_vlan = 0;
 851         u16 num_entries = 0;
 852         u16 change_offset;
 853         u16 tvlv_len;
 854         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 855         struct batadv_orig_node_vlan *vlan;
 856         u8 *tt_change_ptr;
 857
 858         rcu_read_lock();
 859         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 860                 num_vlan++;
 861                 num_entries += atomic_read(&vlan->tt.num_entries);
 862         }
 863
 864         change_offset = sizeof(**tt_data);
 865         change_offset += num_vlan * sizeof(*tt_vlan);
 866
 867         /* if tt_len is negative, allocate the space needed by the full table */
 868         if (*tt_len < 0)
 869                 *tt_len = batadv_tt_len(num_entries);
 870
 871         tvlv_len = *tt_len;
 872         tvlv_len += change_offset;
 873
 874         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 875         if (!*tt_data) {
 876                 *tt_len = 0;
 877                 goto out;
 878         }
 879
 880         (*tt_data)->flags = BATADV_NO_FLAGS;
 881         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 882         (*tt_data)->num_vlan = htons(num_vlan);
 883
 884         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 885         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 886                 tt_vlan->vid = htons(vlan->vid);
 887                 tt_vlan->crc = htonl(vlan->tt.crc);
 888
 889                 tt_vlan++;
 890         }
 891
 892         tt_change_ptr = (u8 *)*tt_data + change_offset;
 893         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 894
 895 out:
 896         rcu_read_unlock();
 897         return tvlv_len;
 898 }
 899
 900 /**
 901  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 902  *  node
 903  * @bat_priv: the bat priv with all the soft interface information
 904  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 905  * @tt_change: uninitialised pointer to the address of the area where the TT
 906  *  changes can be stored
 907  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 908  *  function reserves the amount of space needed to send the entire local TT
 909  *  table. In case of success the value is updated with the real amount of
 910  *  reserved bytes
 911  *
 912  * Allocate the needed amount of memory for the entire TT TVLV and write its
 913  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 914  * objects, one per active VLAN.
 915  *
 916  * Return: the size of the allocated buffer or 0 in case of failure.
 917  */
 918 static u16
 919 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 920                                   struct batadv_tvlv_tt_data **tt_data,
 921                                   struct batadv_tvlv_tt_change **tt_change,
 922                                   s32 *tt_len)
 923 {
 924         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 925         struct batadv_softif_vlan *vlan;
 926         u16 num_vlan = 0;
 927         u16 num_entries = 0;
 928         u16 tvlv_len;
 929         u8 *tt_change_ptr;
 930         int change_offset;
 931
 932         rcu_read_lock();
 933         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 934                 num_vlan++;
 935                 num_entries += atomic_read(&vlan->tt.num_entries);
 936         }
 937
 938         change_offset = sizeof(**tt_data);
 939         change_offset += num_vlan * sizeof(*tt_vlan);
 940
 941         /* if tt_len is negative, allocate the space needed by the full table */
 942         if (*tt_len < 0)
 943                 *tt_len = batadv_tt_len(num_entries);
 944
 945         tvlv_len = *tt_len;
 946         tvlv_len += change_offset;
 947
 948         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 949         if (!*tt_data) {
 950                 tvlv_len = 0;
 951                 goto out;
 952         }
 953
 954         (*tt_data)->flags = BATADV_NO_FLAGS;
 955         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 956         (*tt_data)->num_vlan = htons(num_vlan);
 957
 958         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 959         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 960                 tt_vlan->vid = htons(vlan->vid);
 961                 tt_vlan->crc = htonl(vlan->tt.crc);
 962
 963                 tt_vlan++;
 964         }
 965
 966         tt_change_ptr = (u8 *)*tt_data + change_offset;
 967         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 968
 969 out:
 970         rcu_read_unlock();
 971         return tvlv_len;
 972 }
 973
 974 /**
 975  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 976  *  after local tt changes have been committed
 977  * @bat_priv: the bat priv with all the soft interface information
 978  */
 979 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 980 {
 981         struct batadv_tt_change_node *entry, *safe;
 982         struct batadv_tvlv_tt_data *tt_data;
 983         struct batadv_tvlv_tt_change *tt_change;
 984         int tt_diff_len, tt_change_len = 0;
 985         int tt_diff_entries_num = 0;
 986         int tt_diff_entries_count = 0;
 987         u16 tvlv_len;
 988
 989         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 990         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 991
 992         /* if we have too many changes for one packet don't send any
 993          * and wait for the tt table request which will be fragmented
 994          */
 995         if (tt_diff_len > bat_priv->soft_iface->mtu)
 996                 tt_diff_len = 0;
 997
 998         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 999                                                      &tt_change, &tt_diff_len);
1000         if (!tvlv_len)
1001                 return;
1002
1003         tt_data->flags = BATADV_TT_OGM_DIFF;
1004
1005         if (tt_diff_len == 0)
1006                 goto container_register;
1007
1008         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1009         atomic_set(&bat_priv->tt.local_changes, 0);
1010
1011         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1012                                  list) {
1013                 if (tt_diff_entries_count < tt_diff_entries_num) {
1014                         memcpy(tt_change + tt_diff_entries_count,
1015                                &entry->change,
1016                                sizeof(struct batadv_tvlv_tt_change));
1017                         tt_diff_entries_count++;
1018                 }
1019                 list_del(&entry->list);
1020                 kmem_cache_free(batadv_tt_change_cache, entry);
1021         }
1022         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1023
1024         /* Keep the buffer for possible tt_request */
1025         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1026         kfree(bat_priv->tt.last_changeset);
1027         bat_priv->tt.last_changeset_len = 0;
1028         bat_priv->tt.last_changeset = NULL;
1029         tt_change_len = batadv_tt_len(tt_diff_entries_count);
1030         /* check whether this new OGM has no changes due to size problems */
1031         if (tt_diff_entries_count > 0) {
1032                 /* if kmalloc() fails we will reply with the full table
1033                  * instead of providing the diff
1034                  */
1035                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
1036                 if (bat_priv->tt.last_changeset) {
1037                         memcpy(bat_priv->tt.last_changeset,
1038                                tt_change, tt_change_len);
1039                         bat_priv->tt.last_changeset_len = tt_diff_len;
1040                 }
1041         }
1042         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1043
1044 container_register:
1045         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
1046                                        tvlv_len);
1047         kfree(tt_data);
1048 }
1049
1050 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
1051 {
1052         struct net_device *net_dev = (struct net_device *)seq->private;
1053         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1054         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1055         struct batadv_tt_common_entry *tt_common_entry;
1056         struct batadv_tt_local_entry *tt_local;
1057         struct batadv_hard_iface *primary_if;
1058         struct hlist_head *head;
1059         u32 i;
1060         int last_seen_secs;
1061         int last_seen_msecs;
1062         unsigned long last_seen_jiffies;
1063         bool no_purge;
1064         u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
1065
1066         primary_if = batadv_seq_print_text_primary_if_get(seq);
1067         if (!primary_if)
1068                 goto out;
1069
1070         seq_printf(seq,
1071                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
1072                    net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
1073         seq_puts(seq,
1074                  "       Client         VID Flags    Last seen (CRC       )\n");
1075
1076         for (i = 0; i < hash->size; i++) {
1077                 head = &hash->table[i];
1078
1079                 rcu_read_lock();
1080                 hlist_for_each_entry_rcu(tt_common_entry,
1081                                          head, hash_entry) {
1082                         tt_local = container_of(tt_common_entry,
1083                                                 struct batadv_tt_local_entry,
1084                                                 common);
1085                         last_seen_jiffies = jiffies - tt_local->last_seen;
1086                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1087                         last_seen_secs = last_seen_msecs / 1000;
1088                         last_seen_msecs = last_seen_msecs % 1000;
1089
1090                         no_purge = tt_common_entry->flags & np_flag;
1091                         seq_printf(seq,
1092                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
1093                                    tt_common_entry->addr,
1094                                    BATADV_PRINT_VID(tt_common_entry->vid),
1095                                    ((tt_common_entry->flags &
1096                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1097                                    no_purge ? 'P' : '.',
1098                                    ((tt_common_entry->flags &
1099                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1100                                    ((tt_common_entry->flags &
1101                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1102                                    ((tt_common_entry->flags &
1103                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1104                                    ((tt_common_entry->flags &
1105                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1106                                    no_purge ? 0 : last_seen_secs,
1107                                    no_purge ? 0 : last_seen_msecs,
1108                                    tt_local->vlan->tt.crc);
1109                 }
1110                 rcu_read_unlock();
1111         }
1112 out:
1113         if (primary_if)
1114                 batadv_hardif_put(primary_if);
1115         return 0;
1116 }
1117
1118 /**
1119  * batadv_tt_local_dump_entry - Dump one TT local entry into a message
1120  * @msg :Netlink message to dump into
1121  * @portid: Port making netlink request
1122  * @seq: Sequence number of netlink message
1123  * @bat_priv: The bat priv with all the soft interface information
1124  * @common: tt local & tt global common data
1125  *
1126  * Return: Error code, or 0 on success
1127  */
1128 static int
1129 batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
1130                            struct batadv_priv *bat_priv,
1131                            struct batadv_tt_common_entry *common)
1132 {
1133         void *hdr;
1134         struct batadv_softif_vlan *vlan;
1135         struct batadv_tt_local_entry *local;
1136         unsigned int last_seen_msecs;
1137         u32 crc;
1138
1139         local = container_of(common, struct batadv_tt_local_entry, common);
1140         last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);
1141
1142         vlan = batadv_softif_vlan_get(bat_priv, common->vid);
1143         if (!vlan)
1144                 return 0;
1145
1146         crc = vlan->tt.crc;
1147
1148         batadv_softif_vlan_put(vlan);
1149
1150         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
1151                           NLM_F_MULTI,
1152                           BATADV_CMD_GET_TRANSTABLE_LOCAL);
1153         if (!hdr)
1154                 return -ENOBUFS;
1155
1156         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
1157             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
1158             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
1159             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
1160                 goto nla_put_failure;
1161
1162         if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
1163             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
1164                 goto nla_put_failure;
1165
1166         genlmsg_end(msg, hdr);
1167         return 0;
1168
1169  nla_put_failure:
1170         genlmsg_cancel(msg, hdr);
1171         return -EMSGSIZE;
1172 }
1173
1174 /**
1175  * batadv_tt_local_dump_bucket - Dump one TT local bucket into a message
1176  * @msg: Netlink message to dump into
1177  * @portid: Port making netlink request
1178  * @seq: Sequence number of netlink message
1179  * @bat_priv: The bat priv with all the soft interface information
1180  * @head: Pointer to the list containing the local tt entries
1181  * @idx_s: Number of entries to skip
1182  *
1183  * Return: Error code, or 0 on success
1184  */
1185 static int
1186 batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
1187                             struct batadv_priv *bat_priv,
1188                             struct hlist_head *head, int *idx_s)
1189 {
1190         struct batadv_tt_common_entry *common;
1191         int idx = 0;
1192
1193         rcu_read_lock();
1194         hlist_for_each_entry_rcu(common, head, hash_entry) {
1195                 if (idx++ < *idx_s)
1196                         continue;
1197
1198                 if (batadv_tt_local_dump_entry(msg, portid, seq, bat_priv,
1199                                                common)) {
1200                         rcu_read_unlock();
1201                         *idx_s = idx - 1;
1202                         return -EMSGSIZE;
1203                 }
1204         }
1205         rcu_read_unlock();
1206
1207         *idx_s = 0;
1208         return 0;
1209 }
1210
1211 /**
1212  * batadv_tt_local_dump - Dump TT local entries into a message
1213  * @msg: Netlink message to dump into
1214  * @cb: Parameters from query
1215  *
1216  * Return: Error code, or 0 on success
1217  */
1218 int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
1219 {
1220         struct net *net = sock_net(cb->skb->sk);
1221         struct net_device *soft_iface;
1222         struct batadv_priv *bat_priv;
1223         struct batadv_hard_iface *primary_if = NULL;
1224         struct batadv_hashtable *hash;
1225         struct hlist_head *head;
1226         int ret;
1227         int ifindex;
1228         int bucket = cb->args[0];
1229         int idx = cb->args[1];
1230         int portid = NETLINK_CB(cb->skb).portid;
1231
1232         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
1233         if (!ifindex)
1234                 return -EINVAL;
1235
1236         soft_iface = dev_get_by_index(net, ifindex);
1237         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
1238                 ret = -ENODEV;
1239                 goto out;
1240         }
1241
1242         bat_priv = netdev_priv(soft_iface);
1243
1244         primary_if = batadv_primary_if_get_selected(bat_priv);
1245         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
1246                 ret = -ENOENT;
1247                 goto out;
1248         }
1249
1250         hash = bat_priv->tt.local_hash;
1251
1252         while (bucket < hash->size) {
1253                 head = &hash->table[bucket];
1254
1255                 if (batadv_tt_local_dump_bucket(msg, portid, cb->nlh->nlmsg_seq,
1256                                                 bat_priv, head, &idx))
1257                         break;
1258
1259                 bucket++;
1260         }
1261
1262         ret = msg->len;
1263
1264  out:
1265         if (primary_if)
1266                 batadv_hardif_put(primary_if);
1267         if (soft_iface)
1268                 dev_put(soft_iface);
1269
1270         cb->args[0] = bucket;
1271         cb->args[1] = idx;
1272
1273         return ret;
1274 }
1275
1276 static void
1277 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1278                             struct batadv_tt_local_entry *tt_local_entry,
1279                             u16 flags, const char *message)
1280 {
1281         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1282
1283         /* The local client has to be marked as "pending to be removed" but has
1284          * to be kept in the table in order to send it in a full table
1285          * response issued before the net ttvn increment (consistency check)
1286          */
1287         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1288
1289         batadv_dbg(BATADV_DBG_TT, bat_priv,
1290                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1291                    tt_local_entry->common.addr,
1292                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1293 }
1294
1295 /**
1296  * batadv_tt_local_remove - logically remove an entry from the local table
1297  * @bat_priv: the bat priv with all the soft interface information
1298  * @addr: the MAC address of the client to remove
1299  * @vid: VLAN identifier
1300  * @message: message to append to the log on deletion
1301  * @roaming: true if the deletion is due to a roaming event
1302  *
1303  * Return: the flags assigned to the local entry before being deleted
1304  */
1305 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1306                            unsigned short vid, const char *message,
1307                            bool roaming)
1308 {
1309         struct batadv_tt_local_entry *tt_local_entry;
1310         u16 flags, curr_flags = BATADV_NO_FLAGS;
1311         void *tt_entry_exists;
1312
1313         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1314         if (!tt_local_entry)
1315                 goto out;
1316
1317         curr_flags = tt_local_entry->common.flags;
1318
1319         flags = BATADV_TT_CLIENT_DEL;
1320         /* if this global entry addition is due to a roaming, the node has to
1321          * mark the local entry as "roamed" in order to correctly reroute
1322          * packets later
1323          */
1324         if (roaming) {
1325                 flags |= BATADV_TT_CLIENT_ROAM;
1326                 /* mark the local client as ROAMed */
1327                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1328         }
1329
1330         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1331                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1332                                             message);
1333                 goto out;
1334         }
1335         /* if this client has been added right now, it is possible to
1336          * immediately purge it
1337          */
1338         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1339
1340         tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1341                                              batadv_compare_tt,
1342                                              batadv_choose_tt,
1343                                              &tt_local_entry->common);
1344         if (!tt_entry_exists)
1345                 goto out;
1346
1347         /* extra call to free the local tt entry */
1348         batadv_tt_local_entry_put(tt_local_entry);
1349
1350 out:
1351         if (tt_local_entry)
1352                 batadv_tt_local_entry_put(tt_local_entry);
1353
1354         return curr_flags;
1355 }
1356
1357 /**
1358  * batadv_tt_local_purge_list - purge inactive tt local entries
1359  * @bat_priv: the bat priv with all the soft interface information
1360  * @head: pointer to the list containing the local tt entries
1361  * @timeout: parameter deciding whether a given tt local entry is considered
1362  *  inactive or not
1363  */
1364 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1365                                        struct hlist_head *head,
1366                                        int timeout)
1367 {
1368         struct batadv_tt_local_entry *tt_local_entry;
1369         struct batadv_tt_common_entry *tt_common_entry;
1370         struct hlist_node *node_tmp;
1371
1372         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1373                                   hash_entry) {
1374                 tt_local_entry = container_of(tt_common_entry,
1375                                               struct batadv_tt_local_entry,
1376                                               common);
1377                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1378                         continue;
1379
1380                 /* entry already marked for deletion */
1381                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1382                         continue;
1383
1384                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1385                         continue;
1386
1387                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1388                                             BATADV_TT_CLIENT_DEL, "timed out");
1389         }
1390 }
1391
1392 /**
1393  * batadv_tt_local_purge - purge inactive tt local entries
1394  * @bat_priv: the bat priv with all the soft interface information
1395  * @timeout: parameter deciding whether a given tt local entry is considered
1396  *  inactive or not
1397  */
1398 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1399                                   int timeout)
1400 {
1401         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1402         struct hlist_head *head;
1403         spinlock_t *list_lock; /* protects write access to the hash lists */
1404         u32 i;
1405
1406         for (i = 0; i < hash->size; i++) {
1407                 head = &hash->table[i];
1408                 list_lock = &hash->list_locks[i];
1409
1410                 spin_lock_bh(list_lock);
1411                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1412                 spin_unlock_bh(list_lock);
1413         }
1414 }
1415
1416 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1417 {
1418         struct batadv_hashtable *hash;
1419         spinlock_t *list_lock; /* protects write access to the hash lists */
1420         struct batadv_tt_common_entry *tt_common_entry;
1421         struct batadv_tt_local_entry *tt_local;
1422         struct hlist_node *node_tmp;
1423         struct hlist_head *head;
1424         u32 i;
1425
1426         if (!bat_priv->tt.local_hash)
1427                 return;
1428
1429         hash = bat_priv->tt.local_hash;
1430
1431         for (i = 0; i < hash->size; i++) {
1432                 head = &hash->table[i];
1433                 list_lock = &hash->list_locks[i];
1434
1435                 spin_lock_bh(list_lock);
1436                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1437                                           head, hash_entry) {
1438                         hlist_del_rcu(&tt_common_entry->hash_entry);
1439                         tt_local = container_of(tt_common_entry,
1440                                                 struct batadv_tt_local_entry,
1441                                                 common);
1442
1443                         batadv_tt_local_entry_put(tt_local);
1444                 }
1445                 spin_unlock_bh(list_lock);
1446         }
1447
1448         batadv_hash_destroy(hash);
1449
1450         bat_priv->tt.local_hash = NULL;
1451 }
1452
1453 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1454 {
1455         if (bat_priv->tt.global_hash)
1456                 return 0;
1457
1458         bat_priv->tt.global_hash = batadv_hash_new(1024);
1459
1460         if (!bat_priv->tt.global_hash)
1461                 return -ENOMEM;
1462
1463         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1464                                    &batadv_tt_global_hash_lock_class_key);
1465
1466         return 0;
1467 }
1468
1469 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1470 {
1471         struct batadv_tt_change_node *entry, *safe;
1472
1473         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1474
1475         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1476                                  list) {
1477                 list_del(&entry->list);
1478                 kmem_cache_free(batadv_tt_change_cache, entry);
1479         }
1480
1481         atomic_set(&bat_priv->tt.local_changes, 0);
1482         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1483 }
1484
1485 /**
1486  * batadv_tt_global_orig_entry_find - find a TT orig_list_entry
1487  * @entry: the TT global entry where the orig_list_entry has to be
1488  *  extracted from
1489  * @orig_node: the originator for which the orig_list_entry has to be found
1490  *
1491  * retrieve the orig_tt_list_entry belonging to orig_node from the
1492  * batadv_tt_global_entry list
1493  *
1494  * Return: it with an increased refcounter, NULL if not found
1495  */
1496 static struct batadv_tt_orig_list_entry *
1497 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1498                                  const struct batadv_orig_node *orig_node)
1499 {
1500         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1501         const struct hlist_head *head;
1502
1503         rcu_read_lock();
1504         head = &entry->orig_list;
1505         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1506                 if (tmp_orig_entry->orig_node != orig_node)
1507                         continue;
1508                 if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
1509                         continue;
1510
1511                 orig_entry = tmp_orig_entry;
1512                 break;
1513         }
1514         rcu_read_unlock();
1515
1516         return orig_entry;
1517 }
1518
1519 /**
1520  * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
1521  *  by a given originator
1522  * @entry: the TT global entry to check
1523  * @orig_node: the originator to search in the list
1524  *
1525  * find out if an orig_node is already in the list of a tt_global_entry.
1526  *
1527  * Return: true if found, false otherwise
1528  */
1529 static bool
1530 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1531                                 const struct batadv_orig_node *orig_node)
1532 {
1533         struct batadv_tt_orig_list_entry *orig_entry;
1534         bool found = false;
1535
1536         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1537         if (orig_entry) {
1538                 found = true;
1539                 batadv_tt_orig_list_entry_put(orig_entry);
1540         }
1541
1542         return found;
1543 }
1544
1545 static void
1546 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1547                                 struct batadv_orig_node *orig_node, int ttvn)
1548 {
1549         struct batadv_tt_orig_list_entry *orig_entry;
1550
1551         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1552         if (orig_entry) {
1553                 /* refresh the ttvn: the current value could be a bogus one that
1554                  * was added during a "temporary client detection"
1555                  */
1556                 orig_entry->ttvn = ttvn;
1557                 goto out;
1558         }
1559
1560         orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
1561         if (!orig_entry)
1562                 goto out;
1563
1564         INIT_HLIST_NODE(&orig_entry->list);
1565         kref_get(&orig_node->refcount);
1566         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1567         orig_entry->orig_node = orig_node;
1568         orig_entry->ttvn = ttvn;
1569         kref_init(&orig_entry->refcount);
1570         kref_get(&orig_entry->refcount);
1571
1572         spin_lock_bh(&tt_global->list_lock);
1573         hlist_add_head_rcu(&orig_entry->list,
1574                            &tt_global->orig_list);
1575         spin_unlock_bh(&tt_global->list_lock);
1576         atomic_inc(&tt_global->orig_list_count);
1577
1578 out:
1579         if (orig_entry)
1580                 batadv_tt_orig_list_entry_put(orig_entry);
1581 }
1582
1583 /**
1584  * batadv_tt_global_add - add a new TT global entry or update an existing one
1585  * @bat_priv: the bat priv with all the soft interface information
1586  * @orig_node: the originator announcing the client
1587  * @tt_addr: the mac address of the non-mesh client
1588  * @vid: VLAN identifier
1589  * @flags: TT flags that have to be set for this non-mesh client
1590  * @ttvn: the tt version number ever announcing this non-mesh client
1591  *
1592  * Add a new TT global entry for the given originator. If the entry already
1593  * exists add a new reference to the given originator (a global entry can have
1594  * references to multiple originators) and adjust the flags attribute to reflect
1595  * the function argument.
1596  * If a TT local entry exists for this non-mesh client remove it.
1597  *
1598  * The caller must hold orig_node refcount.
1599  *
1600  * Return: true if the new entry has been added, false otherwise
1601  */
1602 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1603                                  struct batadv_orig_node *orig_node,
1604                                  const unsigned char *tt_addr,
1605                                  unsigned short vid, u16 flags, u8 ttvn)
1606 {
1607         struct batadv_tt_global_entry *tt_global_entry;
1608         struct batadv_tt_local_entry *tt_local_entry;
1609         bool ret = false;
1610         int hash_added;
1611         struct batadv_tt_common_entry *common;
1612         u16 local_flags;
1613
1614         /* ignore global entries from backbone nodes */
1615         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1616                 return true;
1617
1618         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1619         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1620
1621         /* if the node already has a local client for this entry, it has to wait
1622          * for a roaming advertisement instead of manually messing up the global
1623          * table
1624          */
1625         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1626             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1627                 goto out;
1628
1629         if (!tt_global_entry) {
1630                 tt_global_entry = kmem_cache_zalloc(batadv_tg_cache,
1631                                                     GFP_ATOMIC);
1632                 if (!tt_global_entry)
1633                         goto out;
1634
1635                 common = &tt_global_entry->common;
1636                 ether_addr_copy(common->addr, tt_addr);
1637                 common->vid = vid;
1638
1639                 common->flags = flags;
1640                 tt_global_entry->roam_at = 0;
1641                 /* node must store current time in case of roaming. This is
1642                  * needed to purge this entry out on timeout (if nobody claims
1643                  * it)
1644                  */
1645                 if (flags & BATADV_TT_CLIENT_ROAM)
1646                         tt_global_entry->roam_at = jiffies;
1647                 kref_init(&common->refcount);
1648                 kref_get(&common->refcount);
1649                 common->added_at = jiffies;
1650
1651                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1652                 atomic_set(&tt_global_entry->orig_list_count, 0);
1653                 spin_lock_init(&tt_global_entry->list_lock);
1654
1655                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1656                                              batadv_compare_tt,
1657                                              batadv_choose_tt, common,
1658                                              &common->hash_entry);
1659
1660                 if (unlikely(hash_added != 0)) {
1661                         /* remove the reference for the hash */
1662                         batadv_tt_global_entry_put(tt_global_entry);
1663                         goto out_remove;
1664                 }
1665         } else {
1666                 common = &tt_global_entry->common;
1667                 /* If there is already a global entry, we can use this one for
1668                  * our processing.
1669                  * But if we are trying to add a temporary client then here are
1670                  * two options at this point:
1671                  * 1) the global client is not a temporary client: the global
1672                  *    client has to be left as it is, temporary information
1673                  *    should never override any already known client state
1674                  * 2) the global client is a temporary client: purge the
1675                  *    originator list and add the new one orig_entry
1676                  */
1677                 if (flags & BATADV_TT_CLIENT_TEMP) {
1678                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1679                                 goto out;
1680                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1681                                                             orig_node))
1682                                 goto out_remove;
1683                         batadv_tt_global_del_orig_list(tt_global_entry);
1684                         goto add_orig_entry;
1685                 }
1686
1687                 /* if the client was temporary added before receiving the first
1688                  * OGM announcing it, we have to clear the TEMP flag. Also,
1689                  * remove the previous temporary orig node and re-add it
1690                  * if required. If the orig entry changed, the new one which
1691                  * is a non-temporary entry is preferred.
1692                  */
1693                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1694                         batadv_tt_global_del_orig_list(tt_global_entry);
1695                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1696                 }
1697
1698                 /* the change can carry possible "attribute" flags like the
1699                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1700                  * client entry
1701                  */
1702                 common->flags |= flags;
1703
1704                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1705                  * one originator left in the list and we previously received a
1706                  * delete + roaming change for this originator.
1707                  *
1708                  * We should first delete the old originator before adding the
1709                  * new one.
1710                  */
1711                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1712                         batadv_tt_global_del_orig_list(tt_global_entry);
1713                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1714                         tt_global_entry->roam_at = 0;
1715                 }
1716         }
1717 add_orig_entry:
1718         /* add the new orig_entry (if needed) or update it */
1719         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1720
1721         batadv_dbg(BATADV_DBG_TT, bat_priv,
1722                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1723                    common->addr, BATADV_PRINT_VID(common->vid),
1724                    orig_node->orig);
1725         ret = true;
1726
1727 out_remove:
1728         /* Do not remove multicast addresses from the local hash on
1729          * global additions
1730          */
1731         if (is_multicast_ether_addr(tt_addr))
1732                 goto out;
1733
1734         /* remove address from local hash if present */
1735         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1736                                              "global tt received",
1737                                              flags & BATADV_TT_CLIENT_ROAM);
1738         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1739
1740         if (!(flags & BATADV_TT_CLIENT_ROAM))
1741                 /* this is a normal global add. Therefore the client is not in a
1742                  * roaming state anymore.
1743                  */
1744                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1745
1746 out:
1747         if (tt_global_entry)
1748                 batadv_tt_global_entry_put(tt_global_entry);
1749         if (tt_local_entry)
1750                 batadv_tt_local_entry_put(tt_local_entry);
1751         return ret;
1752 }
1753
1754 /**
1755  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1756  * @bat_priv: the bat priv with all the soft interface information
1757  * @tt_global_entry: global translation table entry to be analyzed
1758  *
1759  * This functon assumes the caller holds rcu_read_lock().
1760  * Return: best originator list entry or NULL on errors.
1761  */
1762 static struct batadv_tt_orig_list_entry *
1763 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1764                             struct batadv_tt_global_entry *tt_global_entry)
1765 {
1766         struct batadv_neigh_node *router, *best_router = NULL;
1767         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1768         struct hlist_head *head;
1769         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1770
1771         head = &tt_global_entry->orig_list;
1772         hlist_for_each_entry_rcu(orig_entry, head, list) {
1773                 router = batadv_orig_router_get(orig_entry->orig_node,
1774                                                 BATADV_IF_DEFAULT);
1775                 if (!router)
1776                         continue;
1777
1778                 if (best_router &&
1779                     bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
1780                                    BATADV_IF_DEFAULT) <= 0) {
1781                         batadv_neigh_node_put(router);
1782                         continue;
1783                 }
1784
1785                 /* release the refcount for the "old" best */
1786                 if (best_router)
1787                         batadv_neigh_node_put(best_router);
1788
1789                 best_entry = orig_entry;
1790                 best_router = router;
1791         }
1792
1793         if (best_router)
1794                 batadv_neigh_node_put(best_router);
1795
1796         return best_entry;
1797 }
1798
1799 /**
1800  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1801  *  for this global entry
1802  * @bat_priv: the bat priv with all the soft interface information
1803  * @tt_global_entry: global translation table entry to be printed
1804  * @seq: debugfs table seq_file struct
1805  *
1806  * This functon assumes the caller holds rcu_read_lock().
1807  */
1808 static void
1809 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1810                              struct batadv_tt_global_entry *tt_global_entry,
1811                              struct seq_file *seq)
1812 {
1813         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1814         struct batadv_tt_common_entry *tt_common_entry;
1815         struct batadv_orig_node_vlan *vlan;
1816         struct hlist_head *head;
1817         u8 last_ttvn;
1818         u16 flags;
1819
1820         tt_common_entry = &tt_global_entry->common;
1821         flags = tt_common_entry->flags;
1822
1823         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1824         if (best_entry) {
1825                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1826                                                  tt_common_entry->vid);
1827                 if (!vlan) {
1828                         seq_printf(seq,
1829                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1830                                    BATADV_PRINT_VID(tt_common_entry->vid),
1831                                    best_entry->orig_node->orig);
1832                         goto print_list;
1833                 }
1834
1835                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1836                 seq_printf(seq,
1837                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1838                            '*', tt_global_entry->common.addr,
1839                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1840                            best_entry->ttvn, best_entry->orig_node->orig,
1841                            last_ttvn, vlan->tt.crc,
1842                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1843                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1844                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1845                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1846
1847                 batadv_orig_node_vlan_put(vlan);
1848         }
1849
1850 print_list:
1851         head = &tt_global_entry->orig_list;
1852
1853         hlist_for_each_entry_rcu(orig_entry, head, list) {
1854                 if (best_entry == orig_entry)
1855                         continue;
1856
1857                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1858                                                  tt_common_entry->vid);
1859                 if (!vlan) {
1860                         seq_printf(seq,
1861                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1862                                    BATADV_PRINT_VID(tt_common_entry->vid),
1863                                    orig_entry->orig_node->orig);
1864                         continue;
1865                 }
1866
1867                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1868                 seq_printf(seq,
1869                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1870                            '+', tt_global_entry->common.addr,
1871                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1872                            orig_entry->ttvn, orig_entry->orig_node->orig,
1873                            last_ttvn, vlan->tt.crc,
1874                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1875                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1876                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1877                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1878
1879                 batadv_orig_node_vlan_put(vlan);
1880         }
1881 }
1882
1883 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1884 {
1885         struct net_device *net_dev = (struct net_device *)seq->private;
1886         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1887         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1888         struct batadv_tt_common_entry *tt_common_entry;
1889         struct batadv_tt_global_entry *tt_global;
1890         struct batadv_hard_iface *primary_if;
1891         struct hlist_head *head;
1892         u32 i;
1893
1894         primary_if = batadv_seq_print_text_primary_if_get(seq);
1895         if (!primary_if)
1896                 goto out;
1897
1898         seq_printf(seq,
1899                    "Globally announced TT entries received via the mesh %s\n",
1900                    net_dev->name);
1901         seq_puts(seq,
1902                  "       Client         VID  (TTVN)       Originator      (Curr TTVN) (CRC       ) Flags\n");
1903
1904         for (i = 0; i < hash->size; i++) {
1905                 head = &hash->table[i];
1906
1907                 rcu_read_lock();
1908                 hlist_for_each_entry_rcu(tt_common_entry,
1909                                          head, hash_entry) {
1910                         tt_global = container_of(tt_common_entry,
1911                                                  struct batadv_tt_global_entry,
1912                                                  common);
1913                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1914                 }
1915                 rcu_read_unlock();
1916         }
1917 out:
1918         if (primary_if)
1919                 batadv_hardif_put(primary_if);
1920         return 0;
1921 }
1922
1923 /**
1924  * batadv_tt_global_dump_subentry - Dump all TT local entries into a message
1925  * @msg: Netlink message to dump into
1926  * @portid: Port making netlink request
1927  * @seq: Sequence number of netlink message
1928  * @common: tt local & tt global common data
1929  * @orig: Originator node announcing a non-mesh client
1930  * @best: Is the best originator for the TT entry
1931  *
1932  * Return: Error code, or 0 on success
1933  */
1934 static int
1935 batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
1936                                struct batadv_tt_common_entry *common,
1937                                struct batadv_tt_orig_list_entry *orig,
1938                                bool best)
1939 {
1940         void *hdr;
1941         struct batadv_orig_node_vlan *vlan;
1942         u8 last_ttvn;
1943         u32 crc;
1944
1945         vlan = batadv_orig_node_vlan_get(orig->orig_node,
1946                                          common->vid);
1947         if (!vlan)
1948                 return 0;
1949
1950         crc = vlan->tt.crc;
1951
1952         batadv_orig_node_vlan_put(vlan);
1953
1954         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
1955                           NLM_F_MULTI,
1956                           BATADV_CMD_GET_TRANSTABLE_GLOBAL);
1957         if (!hdr)
1958                 return -ENOBUFS;
1959
1960         last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
1961
1962         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
1963             nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
1964                     orig->orig_node->orig) ||
1965             nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
1966             nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
1967             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
1968             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
1969             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
1970                 goto nla_put_failure;
1971
1972         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
1973                 goto nla_put_failure;
1974
1975         genlmsg_end(msg, hdr);
1976         return 0;
1977
1978  nla_put_failure:
1979         genlmsg_cancel(msg, hdr);
1980         return -EMSGSIZE;
1981 }
1982
1983 /**
1984  * batadv_tt_global_dump_entry - Dump one TT global entry into a message
1985  * @msg: Netlink message to dump into
1986  * @portid: Port making netlink request
1987  * @seq: Sequence number of netlink message
1988  * @bat_priv: The bat priv with all the soft interface information
1989  * @common: tt local & tt global common data
1990  * @sub_s: Number of entries to skip
1991  *
1992  * This function assumes the caller holds rcu_read_lock().
1993  *
1994  * Return: Error code, or 0 on success
1995  */
1996 static int
1997 batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
1998                             struct batadv_priv *bat_priv,
1999                             struct batadv_tt_common_entry *common, int *sub_s)
2000 {
2001         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
2002         struct batadv_tt_global_entry *global;
2003         struct hlist_head *head;
2004         int sub = 0;
2005         bool best;
2006
2007         global = container_of(common, struct batadv_tt_global_entry, common);
2008         best_entry = batadv_transtable_best_orig(bat_priv, global);
2009         head = &global->orig_list;
2010
2011         hlist_for_each_entry_rcu(orig_entry, head, list) {
2012                 if (sub++ < *sub_s)
2013                         continue;
2014
2015                 best = (orig_entry == best_entry);
2016
2017                 if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
2018                                                    orig_entry, best)) {
2019                         *sub_s = sub - 1;
2020                         return -EMSGSIZE;
2021                 }
2022         }
2023
2024         *sub_s = 0;
2025         return 0;
2026 }
2027
2028 /**
2029  * batadv_tt_global_dump_bucket - Dump one TT local bucket into a message
2030  * @msg: Netlink message to dump into
2031  * @portid: Port making netlink request
2032  * @seq: Sequence number of netlink message
2033  * @bat_priv: The bat priv with all the soft interface information
2034  * @head: Pointer to the list containing the global tt entries
2035  * @idx_s: Number of entries to skip
2036  * @sub: Number of entries to skip
2037  *
2038  * Return: Error code, or 0 on success
2039  */
2040 static int
2041 batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2042                              struct batadv_priv *bat_priv,
2043                              struct hlist_head *head, int *idx_s, int *sub)
2044 {
2045         struct batadv_tt_common_entry *common;
2046         int idx = 0;
2047
2048         rcu_read_lock();
2049         hlist_for_each_entry_rcu(common, head, hash_entry) {
2050                 if (idx++ < *idx_s)
2051                         continue;
2052
2053                 if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
2054                                                 common, sub)) {
2055                         rcu_read_unlock();
2056                         *idx_s = idx - 1;
2057                         return -EMSGSIZE;
2058                 }
2059         }
2060         rcu_read_unlock();
2061
2062         *idx_s = 0;
2063         *sub = 0;
2064         return 0;
2065 }
2066
2067 /**
2068  * batadv_tt_global_dump -  Dump TT global entries into a message
2069  * @msg: Netlink message to dump into
2070  * @cb: Parameters from query
2071  *
2072  * Return: Error code, or length of message on success
2073  */
2074 int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
2075 {
2076         struct net *net = sock_net(cb->skb->sk);
2077         struct net_device *soft_iface;
2078         struct batadv_priv *bat_priv;
2079         struct batadv_hard_iface *primary_if = NULL;
2080         struct batadv_hashtable *hash;
2081         struct hlist_head *head;
2082         int ret;
2083         int ifindex;
2084         int bucket = cb->args[0];
2085         int idx = cb->args[1];
2086         int sub = cb->args[2];
2087         int portid = NETLINK_CB(cb->skb).portid;
2088
2089         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
2090         if (!ifindex)
2091                 return -EINVAL;
2092
2093         soft_iface = dev_get_by_index(net, ifindex);
2094         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2095                 ret = -ENODEV;
2096                 goto out;
2097         }
2098
2099         bat_priv = netdev_priv(soft_iface);
2100
2101         primary_if = batadv_primary_if_get_selected(bat_priv);
2102         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2103                 ret = -ENOENT;
2104                 goto out;
2105         }
2106
2107         hash = bat_priv->tt.global_hash;
2108
2109         while (bucket < hash->size) {
2110                 head = &hash->table[bucket];
2111
2112                 if (batadv_tt_global_dump_bucket(msg, portid,
2113                                                  cb->nlh->nlmsg_seq, bat_priv,
2114                                                  head, &idx, &sub))
2115                         break;
2116
2117                 bucket++;
2118         }
2119
2120         ret = msg->len;
2121
2122  out:
2123         if (primary_if)
2124                 batadv_hardif_put(primary_if);
2125         if (soft_iface)
2126                 dev_put(soft_iface);
2127
2128         cb->args[0] = bucket;
2129         cb->args[1] = idx;
2130         cb->args[2] = sub;
2131
2132         return ret;
2133 }
2134
2135 /**
2136  * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
2137  * @tt_global_entry: the global entry to remove the orig_entry from
2138  * @orig_entry: the orig entry to remove and free
2139  *
2140  * Remove an orig_entry from its list in the given tt_global_entry and
2141  * free this orig_entry afterwards.
2142  *
2143  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
2144  * part of a list.
2145  */
2146 static void
2147 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
2148                                  struct batadv_tt_orig_list_entry *orig_entry)
2149 {
2150         lockdep_assert_held(&tt_global_entry->list_lock);
2151
2152         batadv_tt_global_size_dec(orig_entry->orig_node,
2153                                   tt_global_entry->common.vid);
2154         atomic_dec(&tt_global_entry->orig_list_count);
2155         /* requires holding tt_global_entry->list_lock and orig_entry->list
2156          * being part of a list
2157          */
2158         hlist_del_rcu(&orig_entry->list);
2159         batadv_tt_orig_list_entry_put(orig_entry);
2160 }
2161
2162 /* deletes the orig list of a tt_global_entry */
2163 static void
2164 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
2165 {
2166         struct hlist_head *head;
2167         struct hlist_node *safe;
2168         struct batadv_tt_orig_list_entry *orig_entry;
2169
2170         spin_lock_bh(&tt_global_entry->list_lock);
2171         head = &tt_global_entry->orig_list;
2172         hlist_for_each_entry_safe(orig_entry, safe, head, list)
2173                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
2174         spin_unlock_bh(&tt_global_entry->list_lock);
2175 }
2176
2177 /**
2178  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
2179  * @bat_priv: the bat priv with all the soft interface information
2180  * @tt_global_entry: the global entry to remove the orig_node from
2181  * @orig_node: the originator announcing the client
2182  * @message: message to append to the log on deletion
2183  *
2184  * Remove the given orig_node and its according orig_entry from the given
2185  * global tt entry.
2186  */
2187 static void
2188 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
2189                                struct batadv_tt_global_entry *tt_global_entry,
2190                                struct batadv_orig_node *orig_node,
2191                                const char *message)
2192 {
2193         struct hlist_head *head;
2194         struct hlist_node *safe;
2195         struct batadv_tt_orig_list_entry *orig_entry;
2196         unsigned short vid;
2197
2198         spin_lock_bh(&tt_global_entry->list_lock);
2199         head = &tt_global_entry->orig_list;
2200         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
2201                 if (orig_entry->orig_node == orig_node) {
2202                         vid = tt_global_entry->common.vid;
2203                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2204                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
2205                                    orig_node->orig,
2206                                    tt_global_entry->common.addr,
2207                                    BATADV_PRINT_VID(vid), message);
2208                         _batadv_tt_global_del_orig_entry(tt_global_entry,
2209                                                          orig_entry);
2210                 }
2211         }
2212         spin_unlock_bh(&tt_global_entry->list_lock);
2213 }
2214
2215 /* If the client is to be deleted, we check if it is the last origantor entry
2216  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
2217  * timer, otherwise we simply remove the originator scheduled for deletion.
2218  */
2219 static void
2220 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
2221                              struct batadv_tt_global_entry *tt_global_entry,
2222                              struct batadv_orig_node *orig_node,
2223                              const char *message)
2224 {
2225         bool last_entry = true;
2226         struct hlist_head *head;
2227         struct batadv_tt_orig_list_entry *orig_entry;
2228
2229         /* no local entry exists, case 1:
2230          * Check if this is the last one or if other entries exist.
2231          */
2232
2233         rcu_read_lock();
2234         head = &tt_global_entry->orig_list;
2235         hlist_for_each_entry_rcu(orig_entry, head, list) {
2236                 if (orig_entry->orig_node != orig_node) {
2237                         last_entry = false;
2238                         break;
2239                 }
2240         }
2241         rcu_read_unlock();
2242
2243         if (last_entry) {
2244                 /* its the last one, mark for roaming. */
2245                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
2246                 tt_global_entry->roam_at = jiffies;
2247         } else
2248                 /* there is another entry, we can simply delete this
2249                  * one and can still use the other one.
2250                  */
2251                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2252                                                orig_node, message);
2253 }
2254
2255 /**
2256  * batadv_tt_global_del - remove a client from the global table
2257  * @bat_priv: the bat priv with all the soft interface information
2258  * @orig_node: an originator serving this client
2259  * @addr: the mac address of the client
2260  * @vid: VLAN identifier
2261  * @message: a message explaining the reason for deleting the client to print
2262  *  for debugging purpose
2263  * @roaming: true if the deletion has been triggered by a roaming event
2264  */
2265 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
2266                                  struct batadv_orig_node *orig_node,
2267                                  const unsigned char *addr, unsigned short vid,
2268                                  const char *message, bool roaming)
2269 {
2270         struct batadv_tt_global_entry *tt_global_entry;
2271         struct batadv_tt_local_entry *local_entry = NULL;
2272
2273         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2274         if (!tt_global_entry)
2275                 goto out;
2276
2277         if (!roaming) {
2278                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2279                                                orig_node, message);
2280
2281                 if (hlist_empty(&tt_global_entry->orig_list))
2282                         batadv_tt_global_free(bat_priv, tt_global_entry,
2283                                               message);
2284
2285                 goto out;
2286         }
2287
2288         /* if we are deleting a global entry due to a roam
2289          * event, there are two possibilities:
2290          * 1) the client roamed from node A to node B => if there
2291          *    is only one originator left for this client, we mark
2292          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
2293          *    wait for node B to claim it. In case of timeout
2294          *    the entry is purged.
2295          *
2296          *    If there are other originators left, we directly delete
2297          *    the originator.
2298          * 2) the client roamed to us => we can directly delete
2299          *    the global entry, since it is useless now.
2300          */
2301         local_entry = batadv_tt_local_hash_find(bat_priv,
2302                                                 tt_global_entry->common.addr,
2303                                                 vid);
2304         if (local_entry) {
2305                 /* local entry exists, case 2: client roamed to us. */
2306                 batadv_tt_global_del_orig_list(tt_global_entry);
2307                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
2308         } else
2309                 /* no local entry exists, case 1: check for roaming */
2310                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
2311                                              orig_node, message);
2312
2313 out:
2314         if (tt_global_entry)
2315                 batadv_tt_global_entry_put(tt_global_entry);
2316         if (local_entry)
2317                 batadv_tt_local_entry_put(local_entry);
2318 }
2319
2320 /**
2321  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
2322  *  given originator matching the provided vid
2323  * @bat_priv: the bat priv with all the soft interface information
2324  * @orig_node: the originator owning the entries to remove
2325  * @match_vid: the VLAN identifier to match. If negative all the entries will be
2326  *  removed
2327  * @message: debug message to print as "reason"
2328  */
2329 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
2330                                struct batadv_orig_node *orig_node,
2331                                s32 match_vid,
2332                                const char *message)
2333 {
2334         struct batadv_tt_global_entry *tt_global;
2335         struct batadv_tt_common_entry *tt_common_entry;
2336         u32 i;
2337         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2338         struct hlist_node *safe;
2339         struct hlist_head *head;
2340         spinlock_t *list_lock; /* protects write access to the hash lists */
2341         unsigned short vid;
2342
2343         if (!hash)
2344                 return;
2345
2346         for (i = 0; i < hash->size; i++) {
2347                 head = &hash->table[i];
2348                 list_lock = &hash->list_locks[i];
2349
2350                 spin_lock_bh(list_lock);
2351                 hlist_for_each_entry_safe(tt_common_entry, safe,
2352                                           head, hash_entry) {
2353                         /* remove only matching entries */
2354                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
2355                                 continue;
2356
2357                         tt_global = container_of(tt_common_entry,
2358                                                  struct batadv_tt_global_entry,
2359                                                  common);
2360
2361                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
2362                                                        orig_node, message);
2363
2364                         if (hlist_empty(&tt_global->orig_list)) {
2365                                 vid = tt_global->common.vid;
2366                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
2367                                            "Deleting global tt entry %pM (vid: %d): %s\n",
2368                                            tt_global->common.addr,
2369                                            BATADV_PRINT_VID(vid), message);
2370                                 hlist_del_rcu(&tt_common_entry->hash_entry);
2371                                 batadv_tt_global_entry_put(tt_global);
2372                         }
2373                 }
2374                 spin_unlock_bh(list_lock);
2375         }
2376         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2377 }
2378
2379 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
2380                                       char **msg)
2381 {
2382         bool purge = false;
2383         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
2384         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
2385
2386         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
2387             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
2388                 purge = true;
2389                 *msg = "Roaming timeout\n";
2390         }
2391
2392         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
2393             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
2394                 purge = true;
2395                 *msg = "Temporary client timeout\n";
2396         }
2397
2398         return purge;
2399 }
2400
2401 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
2402 {
2403         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2404         struct hlist_head *head;
2405         struct hlist_node *node_tmp;
2406         spinlock_t *list_lock; /* protects write access to the hash lists */
2407         u32 i;
2408         char *msg = NULL;
2409         struct batadv_tt_common_entry *tt_common;
2410         struct batadv_tt_global_entry *tt_global;
2411
2412         for (i = 0; i < hash->size; i++) {
2413                 head = &hash->table[i];
2414                 list_lock = &hash->list_locks[i];
2415
2416                 spin_lock_bh(list_lock);
2417                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2418                                           hash_entry) {
2419                         tt_global = container_of(tt_common,
2420                                                  struct batadv_tt_global_entry,
2421                                                  common);
2422
2423                         if (!batadv_tt_global_to_purge(tt_global, &msg))
2424                                 continue;
2425
2426                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2427                                    "Deleting global tt entry %pM (vid: %d): %s\n",
2428                                    tt_global->common.addr,
2429                                    BATADV_PRINT_VID(tt_global->common.vid),
2430                                    msg);
2431
2432                         hlist_del_rcu(&tt_common->hash_entry);
2433
2434                         batadv_tt_global_entry_put(tt_global);
2435                 }
2436                 spin_unlock_bh(list_lock);
2437         }
2438 }
2439
2440 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2441 {
2442         struct batadv_hashtable *hash;
2443         spinlock_t *list_lock; /* protects write access to the hash lists */
2444         struct batadv_tt_common_entry *tt_common_entry;
2445         struct batadv_tt_global_entry *tt_global;
2446         struct hlist_node *node_tmp;
2447         struct hlist_head *head;
2448         u32 i;
2449
2450         if (!bat_priv->tt.global_hash)
2451                 return;
2452
2453         hash = bat_priv->tt.global_hash;
2454
2455         for (i = 0; i < hash->size; i++) {
2456                 head = &hash->table[i];
2457                 list_lock = &hash->list_locks[i];
2458
2459                 spin_lock_bh(list_lock);
2460                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2461                                           head, hash_entry) {
2462                         hlist_del_rcu(&tt_common_entry->hash_entry);
2463                         tt_global = container_of(tt_common_entry,
2464                                                  struct batadv_tt_global_entry,
2465                                                  common);
2466                         batadv_tt_global_entry_put(tt_global);
2467                 }
2468                 spin_unlock_bh(list_lock);
2469         }
2470
2471         batadv_hash_destroy(hash);
2472
2473         bat_priv->tt.global_hash = NULL;
2474 }
2475
2476 static bool
2477 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2478                        struct batadv_tt_global_entry *tt_global_entry)
2479 {
2480         bool ret = false;
2481
2482         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2483             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2484                 ret = true;
2485
2486         /* check if the two clients are marked as isolated */
2487         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2488             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2489                 ret = true;
2490
2491         return ret;
2492 }
2493
2494 /**
2495  * batadv_transtable_search - get the mesh destination for a given client
2496  * @bat_priv: the bat priv with all the soft interface information
2497  * @src: mac address of the source client
2498  * @addr: mac address of the destination client
2499  * @vid: VLAN identifier
2500  *
2501  * Return: a pointer to the originator that was selected as destination in the
2502  * mesh for contacting the client 'addr', NULL otherwise.
2503  * In case of multiple originators serving the same client, the function returns
2504  * the best one (best in terms of metric towards the destination node).
2505  *
2506  * If the two clients are AP isolated the function returns NULL.
2507  */
2508 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2509                                                   const u8 *src,
2510                                                   const u8 *addr,
2511                                                   unsigned short vid)
2512 {
2513         struct batadv_tt_local_entry *tt_local_entry = NULL;
2514         struct batadv_tt_global_entry *tt_global_entry = NULL;
2515         struct batadv_orig_node *orig_node = NULL;
2516         struct batadv_tt_orig_list_entry *best_entry;
2517
2518         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2519                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2520                 if (!tt_local_entry ||
2521                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2522                         goto out;
2523         }
2524
2525         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2526         if (!tt_global_entry)
2527                 goto out;
2528
2529         /* check whether the clients should not communicate due to AP
2530          * isolation
2531          */
2532         if (tt_local_entry &&
2533             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2534                 goto out;
2535
2536         rcu_read_lock();
2537         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2538         /* found anything? */
2539         if (best_entry)
2540                 orig_node = best_entry->orig_node;
2541         if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2542                 orig_node = NULL;
2543         rcu_read_unlock();
2544
2545 out:
2546         if (tt_global_entry)
2547                 batadv_tt_global_entry_put(tt_global_entry);
2548         if (tt_local_entry)
2549                 batadv_tt_local_entry_put(tt_local_entry);
2550
2551         return orig_node;
2552 }
2553
2554 /**
2555  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2556  *  to the given orig_node
2557  * @bat_priv: the bat priv with all the soft interface information
2558  * @orig_node: originator for which the CRC should be computed
2559  * @vid: VLAN identifier for which the CRC32 has to be computed
2560  *
2561  * This function computes the checksum for the global table corresponding to a
2562  * specific originator. In particular, the checksum is computed as follows: For
2563  * each client connected to the originator the CRC32C of the MAC address and the
2564  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2565  * together.
2566  *
2567  * The idea behind is that CRC32C should be used as much as possible in order to
2568  * produce a unique hash of the table, but since the order which is used to feed
2569  * the CRC32C function affects the result and since every node in the network
2570  * probably sorts the clients differently, the hash function cannot be directly
2571  * computed over the entire table. Hence the CRC32C is used only on
2572  * the single client entry, while all the results are then xor'ed together
2573  * because the XOR operation can combine them all while trying to reduce the
2574  * noise as much as possible.
2575  *
2576  * Return: the checksum of the global table of a given originator.
2577  */
2578 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2579                                 struct batadv_orig_node *orig_node,
2580                                 unsigned short vid)
2581 {
2582         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2583         struct batadv_tt_common_entry *tt_common;
2584         struct batadv_tt_global_entry *tt_global;
2585         struct hlist_head *head;
2586         u32 i, crc_tmp, crc = 0;
2587         u8 flags;
2588         __be16 tmp_vid;
2589
2590         for (i = 0; i < hash->size; i++) {
2591                 head = &hash->table[i];
2592
2593                 rcu_read_lock();
2594                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2595                         tt_global = container_of(tt_common,
2596                                                  struct batadv_tt_global_entry,
2597                                                  common);
2598                         /* compute the CRC only for entries belonging to the
2599                          * VLAN identified by the vid passed as parameter
2600                          */
2601                         if (tt_common->vid != vid)
2602                                 continue;
2603
2604                         /* Roaming clients are in the global table for
2605                          * consistency only. They don't have to be
2606                          * taken into account while computing the
2607                          * global crc
2608                          */
2609                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2610                                 continue;
2611                         /* Temporary clients have not been announced yet, so
2612                          * they have to be skipped while computing the global
2613                          * crc
2614                          */
2615                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2616                                 continue;
2617
2618                         /* find out if this global entry is announced by this
2619                          * originator
2620                          */
2621                         if (!batadv_tt_global_entry_has_orig(tt_global,
2622                                                              orig_node))
2623                                 continue;
2624
2625                         /* use network order to read the VID: this ensures that
2626                          * every node reads the bytes in the same order.
2627                          */
2628                         tmp_vid = htons(tt_common->vid);
2629                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2630
2631                         /* compute the CRC on flags that have to be kept in sync
2632                          * among nodes
2633                          */
2634                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2635                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2636
2637                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2638                 }
2639                 rcu_read_unlock();
2640         }
2641
2642         return crc;
2643 }
2644
2645 /**
2646  * batadv_tt_local_crc - calculates the checksum of the local table
2647  * @bat_priv: the bat priv with all the soft interface information
2648  * @vid: VLAN identifier for which the CRC32 has to be computed
2649  *
2650  * For details about the computation, please refer to the documentation for
2651  * batadv_tt_global_crc().
2652  *
2653  * Return: the checksum of the local table
2654  */
2655 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2656                                unsigned short vid)
2657 {
2658         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2659         struct batadv_tt_common_entry *tt_common;
2660         struct hlist_head *head;
2661         u32 i, crc_tmp, crc = 0;
2662         u8 flags;
2663         __be16 tmp_vid;
2664
2665         for (i = 0; i < hash->size; i++) {
2666                 head = &hash->table[i];
2667
2668                 rcu_read_lock();
2669                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2670                         /* compute the CRC only for entries belonging to the
2671                          * VLAN identified by vid
2672                          */
2673                         if (tt_common->vid != vid)
2674                                 continue;
2675
2676                         /* not yet committed clients have not to be taken into
2677                          * account while computing the CRC
2678                          */
2679                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2680                                 continue;
2681
2682                         /* use network order to read the VID: this ensures that
2683                          * every node reads the bytes in the same order.
2684                          */
2685                         tmp_vid = htons(tt_common->vid);
2686                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2687
2688                         /* compute the CRC on flags that have to be kept in sync
2689                          * among nodes
2690                          */
2691                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2692                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2693
2694                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2695                 }
2696                 rcu_read_unlock();
2697         }
2698
2699         return crc;
2700 }
2701
2702 /**
2703  * batadv_tt_req_node_release - free tt_req node entry
2704  * @ref: kref pointer of the tt req_node entry
2705  */
2706 static void batadv_tt_req_node_release(struct kref *ref)
2707 {
2708         struct batadv_tt_req_node *tt_req_node;
2709
2710         tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2711
2712         kmem_cache_free(batadv_tt_req_cache, tt_req_node);
2713 }
2714
2715 /**
2716  * batadv_tt_req_node_put - decrement the tt_req_node refcounter and
2717  *  possibly release it
2718  * @tt_req_node: tt_req_node to be free'd
2719  */
2720 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2721 {
2722         kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2723 }
2724
2725 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2726 {
2727         struct batadv_tt_req_node *node;
2728         struct hlist_node *safe;
2729
2730         spin_lock_bh(&bat_priv->tt.req_list_lock);
2731
2732         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2733                 hlist_del_init(&node->list);
2734                 batadv_tt_req_node_put(node);
2735         }
2736
2737         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2738 }
2739
2740 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2741                                        struct batadv_orig_node *orig_node,
2742                                        const void *tt_buff,
2743                                        u16 tt_buff_len)
2744 {
2745         /* Replace the old buffer only if I received something in the
2746          * last OGM (the OGM could carry no changes)
2747          */
2748         spin_lock_bh(&orig_node->tt_buff_lock);
2749         if (tt_buff_len > 0) {
2750                 kfree(orig_node->tt_buff);
2751                 orig_node->tt_buff_len = 0;
2752                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2753                 if (orig_node->tt_buff) {
2754                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2755                         orig_node->tt_buff_len = tt_buff_len;
2756                 }
2757         }
2758         spin_unlock_bh(&orig_node->tt_buff_lock);
2759 }
2760
2761 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2762 {
2763         struct batadv_tt_req_node *node;
2764         struct hlist_node *safe;
2765
2766         spin_lock_bh(&bat_priv->tt.req_list_lock);
2767         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2768                 if (batadv_has_timed_out(node->issued_at,
2769                                          BATADV_TT_REQUEST_TIMEOUT)) {
2770                         hlist_del_init(&node->list);
2771                         batadv_tt_req_node_put(node);
2772                 }
2773         }
2774         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2775 }
2776
2777 /**
2778  * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2779  * @bat_priv: the bat priv with all the soft interface information
2780  * @orig_node: orig node this request is being issued for
2781  *
2782  * Return: the pointer to the new tt_req_node struct if no request
2783  * has already been issued for this orig_node, NULL otherwise.
2784  */
2785 static struct batadv_tt_req_node *
2786 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2787                        struct batadv_orig_node *orig_node)
2788 {
2789         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2790
2791         spin_lock_bh(&bat_priv->tt.req_list_lock);
2792         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2793                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2794                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2795                                           BATADV_TT_REQUEST_TIMEOUT))
2796                         goto unlock;
2797         }
2798
2799         tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
2800         if (!tt_req_node)
2801                 goto unlock;
2802
2803         kref_init(&tt_req_node->refcount);
2804         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2805         tt_req_node->issued_at = jiffies;
2806
2807         kref_get(&tt_req_node->refcount);
2808         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2809 unlock:
2810         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2811         return tt_req_node;
2812 }
2813
2814 /**
2815  * batadv_tt_local_valid - verify that given tt entry is a valid one
2816  * @entry_ptr: to be checked local tt entry
2817  * @data_ptr: not used but definition required to satisfy the callback prototype
2818  *
2819  * Return: true if the entry is a valid, false otherwise.
2820  */
2821 static bool batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2822 {
2823         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2824
2825         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2826                 return false;
2827         return true;
2828 }
2829
2830 static bool batadv_tt_global_valid(const void *entry_ptr,
2831                                    const void *data_ptr)
2832 {
2833         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2834         const struct batadv_tt_global_entry *tt_global_entry;
2835         const struct batadv_orig_node *orig_node = data_ptr;
2836
2837         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2838             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2839                 return false;
2840
2841         tt_global_entry = container_of(tt_common_entry,
2842                                        struct batadv_tt_global_entry,
2843                                        common);
2844
2845         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2846 }
2847
2848 /**
2849  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2850  *  specified tt hash
2851  * @bat_priv: the bat priv with all the soft interface information
2852  * @hash: hash table containing the tt entries
2853  * @tt_len: expected tvlv tt data buffer length in number of bytes
2854  * @tvlv_buff: pointer to the buffer to fill with the TT data
2855  * @valid_cb: function to filter tt change entries
2856  * @cb_data: data passed to the filter function as argument
2857  */
2858 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2859                                     struct batadv_hashtable *hash,
2860                                     void *tvlv_buff, u16 tt_len,
2861                                     bool (*valid_cb)(const void *,
2862                                                      const void *),
2863                                     void *cb_data)
2864 {
2865         struct batadv_tt_common_entry *tt_common_entry;
2866         struct batadv_tvlv_tt_change *tt_change;
2867         struct hlist_head *head;
2868         u16 tt_tot, tt_num_entries = 0;
2869         u32 i;
2870
2871         tt_tot = batadv_tt_entries(tt_len);
2872         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2873
2874         rcu_read_lock();
2875         for (i = 0; i < hash->size; i++) {
2876                 head = &hash->table[i];
2877
2878                 hlist_for_each_entry_rcu(tt_common_entry,
2879                                          head, hash_entry) {
2880                         if (tt_tot == tt_num_entries)
2881                                 break;
2882
2883                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2884                                 continue;
2885
2886                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2887                         tt_change->flags = tt_common_entry->flags;
2888                         tt_change->vid = htons(tt_common_entry->vid);
2889                         memset(tt_change->reserved, 0,
2890                                sizeof(tt_change->reserved));
2891
2892                         tt_num_entries++;
2893                         tt_change++;
2894                 }
2895         }
2896         rcu_read_unlock();
2897 }
2898
2899 /**
2900  * batadv_tt_global_check_crc - check if all the CRCs are correct
2901  * @orig_node: originator for which the CRCs have to be checked
2902  * @tt_vlan: pointer to the first tvlv VLAN entry
2903  * @num_vlan: number of tvlv VLAN entries
2904  *
2905  * Return: true if all the received CRCs match the locally stored ones, false
2906  * otherwise
2907  */
2908 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2909                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2910                                        u16 num_vlan)
2911 {
2912         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2913         struct batadv_orig_node_vlan *vlan;
2914         int i, orig_num_vlan;
2915         u32 crc;
2916
2917         /* check if each received CRC matches the locally stored one */
2918         for (i = 0; i < num_vlan; i++) {
2919                 tt_vlan_tmp = tt_vlan + i;
2920
2921                 /* if orig_node is a backbone node for this VLAN, don't check
2922                  * the CRC as we ignore all the global entries over it
2923                  */
2924                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2925                                                    orig_node->orig,
2926                                                    ntohs(tt_vlan_tmp->vid)))
2927                         continue;
2928
2929                 vlan = batadv_orig_node_vlan_get(orig_node,
2930                                                  ntohs(tt_vlan_tmp->vid));
2931                 if (!vlan)
2932                         return false;
2933
2934                 crc = vlan->tt.crc;
2935                 batadv_orig_node_vlan_put(vlan);
2936
2937                 if (crc != ntohl(tt_vlan_tmp->crc))
2938                         return false;
2939         }
2940
2941         /* check if any excess VLANs exist locally for the originator
2942          * which are not mentioned in the TVLV from the originator.
2943          */
2944         rcu_read_lock();
2945         orig_num_vlan = 0;
2946         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2947                 orig_num_vlan++;
2948         rcu_read_unlock();
2949
2950         if (orig_num_vlan > num_vlan)
2951                 return false;
2952
2953         return true;
2954 }
2955
2956 /**
2957  * batadv_tt_local_update_crc - update all the local CRCs
2958  * @bat_priv: the bat priv with all the soft interface information
2959  */
2960 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2961 {
2962         struct batadv_softif_vlan *vlan;
2963
2964         /* recompute the global CRC for each VLAN */
2965         rcu_read_lock();
2966         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2967                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2968         }
2969         rcu_read_unlock();
2970 }
2971
2972 /**
2973  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2974  * @bat_priv: the bat priv with all the soft interface information
2975  * @orig_node: the orig_node for which the CRCs have to be updated
2976  */
2977 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2978                                         struct batadv_orig_node *orig_node)
2979 {
2980         struct batadv_orig_node_vlan *vlan;
2981         u32 crc;
2982
2983         /* recompute the global CRC for each VLAN */
2984         rcu_read_lock();
2985         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2986                 /* if orig_node is a backbone node for this VLAN, don't compute
2987                  * the CRC as we ignore all the global entries over it
2988                  */
2989                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2990                                                    vlan->vid))
2991                         continue;
2992
2993                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2994                 vlan->tt.crc = crc;
2995         }
2996         rcu_read_unlock();
2997 }
2998
2999 /**
3000  * batadv_send_tt_request - send a TT Request message to a given node
3001  * @bat_priv: the bat priv with all the soft interface information
3002  * @dst_orig_node: the destination of the message
3003  * @ttvn: the version number that the source of the message is looking for
3004  * @tt_vlan: pointer to the first tvlv VLAN object to request
3005  * @num_vlan: number of tvlv VLAN entries
3006  * @full_table: ask for the entire translation table if true, while only for the
3007  *  last TT diff otherwise
3008  *
3009  * Return: true if the TT Request was sent, false otherwise
3010  */
3011 static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
3012                                    struct batadv_orig_node *dst_orig_node,
3013                                    u8 ttvn,
3014                                    struct batadv_tvlv_tt_vlan_data *tt_vlan,
3015                                    u16 num_vlan, bool full_table)
3016 {
3017         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3018         struct batadv_tt_req_node *tt_req_node = NULL;
3019         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
3020         struct batadv_hard_iface *primary_if;
3021         bool ret = false;
3022         int i, size;
3023
3024         primary_if = batadv_primary_if_get_selected(bat_priv);
3025         if (!primary_if)
3026                 goto out;
3027
3028         /* The new tt_req will be issued only if I'm not waiting for a
3029          * reply from the same orig_node yet
3030          */
3031         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
3032         if (!tt_req_node)
3033                 goto out;
3034
3035         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
3036         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
3037         if (!tvlv_tt_data)
3038                 goto out;
3039
3040         tvlv_tt_data->flags = BATADV_TT_REQUEST;
3041         tvlv_tt_data->ttvn = ttvn;
3042         tvlv_tt_data->num_vlan = htons(num_vlan);
3043
3044         /* send all the CRCs within the request. This is needed by intermediate
3045          * nodes to ensure they have the correct table before replying
3046          */
3047         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
3048         for (i = 0; i < num_vlan; i++) {
3049                 tt_vlan_req->vid = tt_vlan->vid;
3050                 tt_vlan_req->crc = tt_vlan->crc;
3051
3052                 tt_vlan_req++;
3053                 tt_vlan++;
3054         }
3055
3056         if (full_table)
3057                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3058
3059         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
3060                    dst_orig_node->orig, full_table ? 'F' : '.');
3061
3062         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
3063         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3064                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
3065                                  tvlv_tt_data, size);
3066         ret = true;
3067
3068 out:
3069         if (primary_if)
3070                 batadv_hardif_put(primary_if);
3071
3072         if (ret && tt_req_node) {
3073                 spin_lock_bh(&bat_priv->tt.req_list_lock);
3074                 if (!hlist_unhashed(&tt_req_node->list)) {
3075                         hlist_del_init(&tt_req_node->list);
3076                         batadv_tt_req_node_put(tt_req_node);
3077                 }
3078                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3079         }
3080
3081         if (tt_req_node)
3082                 batadv_tt_req_node_put(tt_req_node);
3083
3084         kfree(tvlv_tt_data);
3085         return ret;
3086 }
3087
3088 /**
3089  * batadv_send_other_tt_response - send reply to tt request concerning another
3090  *  node's translation table
3091  * @bat_priv: the bat priv with all the soft interface information
3092  * @tt_data: tt data containing the tt request information
3093  * @req_src: mac address of tt request sender
3094  * @req_dst: mac address of tt request recipient
3095  *
3096  * Return: true if tt request reply was sent, false otherwise.
3097  */
3098 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
3099                                           struct batadv_tvlv_tt_data *tt_data,
3100                                           u8 *req_src, u8 *req_dst)
3101 {
3102         struct batadv_orig_node *req_dst_orig_node;
3103         struct batadv_orig_node *res_dst_orig_node = NULL;
3104         struct batadv_tvlv_tt_change *tt_change;
3105         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3106         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3107         bool ret = false, full_table;
3108         u8 orig_ttvn, req_ttvn;
3109         u16 tvlv_len;
3110         s32 tt_len;
3111
3112         batadv_dbg(BATADV_DBG_TT, bat_priv,
3113                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
3114                    req_src, tt_data->ttvn, req_dst,
3115                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3116
3117         /* Let's get the orig node of the REAL destination */
3118         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
3119         if (!req_dst_orig_node)
3120                 goto out;
3121
3122         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
3123         if (!res_dst_orig_node)
3124                 goto out;
3125
3126         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
3127         req_ttvn = tt_data->ttvn;
3128
3129         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3130         /* this node doesn't have the requested data */
3131         if (orig_ttvn != req_ttvn ||
3132             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
3133                                         ntohs(tt_data->num_vlan)))
3134                 goto out;
3135
3136         /* If the full table has been explicitly requested */
3137         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
3138             !req_dst_orig_node->tt_buff)
3139                 full_table = true;
3140         else
3141                 full_table = false;
3142
3143         /* TT fragmentation hasn't been implemented yet, so send as many
3144          * TT entries fit a single packet as possible only
3145          */
3146         if (!full_table) {
3147                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
3148                 tt_len = req_dst_orig_node->tt_buff_len;
3149
3150                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3151                                                               &tvlv_tt_data,
3152                                                               &tt_change,
3153                                                               &tt_len);
3154                 if (!tt_len)
3155                         goto unlock;
3156
3157                 /* Copy the last orig_node's OGM buffer */
3158                 memcpy(tt_change, req_dst_orig_node->tt_buff,
3159                        req_dst_orig_node->tt_buff_len);
3160                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3161         } else {
3162                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3163                  * in the initial part
3164                  */
3165                 tt_len = -1;
3166                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3167                                                               &tvlv_tt_data,
3168                                                               &tt_change,
3169                                                               &tt_len);
3170                 if (!tt_len)
3171                         goto out;
3172
3173                 /* fill the rest of the tvlv with the real TT entries */
3174                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
3175                                         tt_change, tt_len,
3176                                         batadv_tt_global_valid,
3177                                         req_dst_orig_node);
3178         }
3179
3180         /* Don't send the response, if larger than fragmented packet. */
3181         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
3182         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
3183                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
3184                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
3185                                          res_dst_orig_node->orig);
3186                 goto out;
3187         }
3188
3189         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3190         tvlv_tt_data->ttvn = req_ttvn;
3191
3192         if (full_table)
3193                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3194
3195         batadv_dbg(BATADV_DBG_TT, bat_priv,
3196                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
3197                    res_dst_orig_node->orig, req_dst_orig_node->orig,
3198                    full_table ? 'F' : '.', req_ttvn);
3199
3200         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3201
3202         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
3203                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3204                                  tvlv_len);
3205
3206         ret = true;
3207         goto out;
3208
3209 unlock:
3210         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3211
3212 out:
3213         if (res_dst_orig_node)
3214                 batadv_orig_node_put(res_dst_orig_node);
3215         if (req_dst_orig_node)
3216                 batadv_orig_node_put(req_dst_orig_node);
3217         kfree(tvlv_tt_data);
3218         return ret;
3219 }
3220
3221 /**
3222  * batadv_send_my_tt_response - send reply to tt request concerning this node's
3223  *  translation table
3224  * @bat_priv: the bat priv with all the soft interface information
3225  * @tt_data: tt data containing the tt request information
3226  * @req_src: mac address of tt request sender
3227  *
3228  * Return: true if tt request reply was sent, false otherwise.
3229  */
3230 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
3231                                        struct batadv_tvlv_tt_data *tt_data,
3232                                        u8 *req_src)
3233 {
3234         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3235         struct batadv_hard_iface *primary_if = NULL;
3236         struct batadv_tvlv_tt_change *tt_change;
3237         struct batadv_orig_node *orig_node;
3238         u8 my_ttvn, req_ttvn;
3239         u16 tvlv_len;
3240         bool full_table;
3241         s32 tt_len;
3242
3243         batadv_dbg(BATADV_DBG_TT, bat_priv,
3244                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
3245                    req_src, tt_data->ttvn,
3246                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3247
3248         spin_lock_bh(&bat_priv->tt.commit_lock);
3249
3250         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3251         req_ttvn = tt_data->ttvn;
3252
3253         orig_node = batadv_orig_hash_find(bat_priv, req_src);
3254         if (!orig_node)
3255                 goto out;
3256
3257         primary_if = batadv_primary_if_get_selected(bat_priv);
3258         if (!primary_if)
3259                 goto out;
3260
3261         /* If the full table has been explicitly requested or the gap
3262          * is too big send the whole local translation table
3263          */
3264         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
3265             !bat_priv->tt.last_changeset)
3266                 full_table = true;
3267         else
3268                 full_table = false;
3269
3270         /* TT fragmentation hasn't been implemented yet, so send as many
3271          * TT entries fit a single packet as possible only
3272          */
3273         if (!full_table) {
3274                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
3275
3276                 tt_len = bat_priv->tt.last_changeset_len;
3277                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3278                                                              &tvlv_tt_data,
3279                                                              &tt_change,
3280                                                              &tt_len);
3281                 if (!tt_len)
3282                         goto unlock;
3283
3284                 /* Copy the last orig_node's OGM buffer */
3285                 memcpy(tt_change, bat_priv->tt.last_changeset,
3286                        bat_priv->tt.last_changeset_len);
3287                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3288         } else {
3289                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3290
3291                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3292                  * in the initial part
3293                  */
3294                 tt_len = -1;
3295                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3296                                                              &tvlv_tt_data,
3297                                                              &tt_change,
3298                                                              &tt_len);
3299                 if (!tt_len)
3300                         goto out;
3301
3302                 /* fill the rest of the tvlv with the real TT entries */
3303                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
3304                                         tt_change, tt_len,
3305                                         batadv_tt_local_valid, NULL);
3306         }
3307
3308         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3309         tvlv_tt_data->ttvn = req_ttvn;
3310
3311         if (full_table)
3312                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3313
3314         batadv_dbg(BATADV_DBG_TT, bat_priv,
3315                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
3316                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
3317
3318         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3319
3320         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3321                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3322                                  tvlv_len);
3323
3324         goto out;
3325
3326 unlock:
3327         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3328 out:
3329         spin_unlock_bh(&bat_priv->tt.commit_lock);
3330         if (orig_node)
3331                 batadv_orig_node_put(orig_node);
3332         if (primary_if)
3333                 batadv_hardif_put(primary_if);
3334         kfree(tvlv_tt_data);
3335         /* The packet was for this host, so it doesn't need to be re-routed */
3336         return true;
3337 }
3338
3339 /**
3340  * batadv_send_tt_response - send reply to tt request
3341  * @bat_priv: the bat priv with all the soft interface information
3342  * @tt_data: tt data containing the tt request information
3343  * @req_src: mac address of tt request sender
3344  * @req_dst: mac address of tt request recipient
3345  *
3346  * Return: true if tt request reply was sent, false otherwise.
3347  */
3348 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
3349                                     struct batadv_tvlv_tt_data *tt_data,
3350                                     u8 *req_src, u8 *req_dst)
3351 {
3352         if (batadv_is_my_mac(bat_priv, req_dst))
3353                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
3354         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
3355                                              req_dst);
3356 }
3357
3358 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
3359                                       struct batadv_orig_node *orig_node,
3360                                       struct batadv_tvlv_tt_change *tt_change,
3361                                       u16 tt_num_changes, u8 ttvn)
3362 {
3363         int i;
3364         int roams;
3365
3366         for (i = 0; i < tt_num_changes; i++) {
3367                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
3368                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
3369                         batadv_tt_global_del(bat_priv, orig_node,
3370                                              (tt_change + i)->addr,
3371                                              ntohs((tt_change + i)->vid),
3372                                              "tt removed by changes",
3373                                              roams);
3374                 } else {
3375                         if (!batadv_tt_global_add(bat_priv, orig_node,
3376                                                   (tt_change + i)->addr,
3377                                                   ntohs((tt_change + i)->vid),
3378                                                   (tt_change + i)->flags, ttvn))
3379                                 /* In case of problem while storing a
3380                                  * global_entry, we stop the updating
3381                                  * procedure without committing the
3382                                  * ttvn change. This will avoid to send
3383                                  * corrupted data on tt_request
3384                                  */
3385                                 return;
3386                 }
3387         }
3388         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
3389 }
3390
3391 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
3392                                   struct batadv_tvlv_tt_change *tt_change,
3393                                   u8 ttvn, u8 *resp_src,
3394                                   u16 num_entries)
3395 {
3396         struct batadv_orig_node *orig_node;
3397
3398         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3399         if (!orig_node)
3400                 goto out;
3401
3402         /* Purge the old table first.. */
3403         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
3404                                   "Received full table");
3405
3406         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
3407                                   ttvn);
3408
3409         spin_lock_bh(&orig_node->tt_buff_lock);
3410         kfree(orig_node->tt_buff);
3411         orig_node->tt_buff_len = 0;
3412         orig_node->tt_buff = NULL;
3413         spin_unlock_bh(&orig_node->tt_buff_lock);
3414
3415         atomic_set(&orig_node->last_ttvn, ttvn);
3416
3417 out:
3418         if (orig_node)
3419                 batadv_orig_node_put(orig_node);
3420 }
3421
3422 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
3423                                      struct batadv_orig_node *orig_node,
3424                                      u16 tt_num_changes, u8 ttvn,
3425                                      struct batadv_tvlv_tt_change *tt_change)
3426 {
3427         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
3428                                   tt_num_changes, ttvn);
3429
3430         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3431                                    batadv_tt_len(tt_num_changes));
3432         atomic_set(&orig_node->last_ttvn, ttvn);
3433 }
3434
3435 /**
3436  * batadv_is_my_client - check if a client is served by the local node
3437  * @bat_priv: the bat priv with all the soft interface information
3438  * @addr: the mac address of the client to check
3439  * @vid: VLAN identifier
3440  *
3441  * Return: true if the client is served by this node, false otherwise.
3442  */
3443 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3444                          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         /* Check if the client has been logically deleted (but is kept for
3453          * consistency purpose)
3454          */
3455         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3456             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3457                 goto out;
3458         ret = true;
3459 out:
3460         if (tt_local_entry)
3461                 batadv_tt_local_entry_put(tt_local_entry);
3462         return ret;
3463 }
3464
3465 /**
3466  * batadv_handle_tt_response - process incoming tt reply
3467  * @bat_priv: the bat priv with all the soft interface information
3468  * @tt_data: tt data containing the tt request information
3469  * @resp_src: mac address of tt reply sender
3470  * @num_entries: number of tt change entries appended to the tt data
3471  */
3472 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3473                                       struct batadv_tvlv_tt_data *tt_data,
3474                                       u8 *resp_src, u16 num_entries)
3475 {
3476         struct batadv_tt_req_node *node;
3477         struct hlist_node *safe;
3478         struct batadv_orig_node *orig_node = NULL;
3479         struct batadv_tvlv_tt_change *tt_change;
3480         u8 *tvlv_ptr = (u8 *)tt_data;
3481         u16 change_offset;
3482
3483         batadv_dbg(BATADV_DBG_TT, bat_priv,
3484                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3485                    resp_src, tt_data->ttvn, num_entries,
3486                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3487
3488         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3489         if (!orig_node)
3490                 goto out;
3491
3492         spin_lock_bh(&orig_node->tt_lock);
3493
3494         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3495         change_offset *= ntohs(tt_data->num_vlan);
3496         change_offset += sizeof(*tt_data);
3497         tvlv_ptr += change_offset;
3498
3499         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3500         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3501                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3502                                       resp_src, num_entries);
3503         } else {
3504                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3505                                          tt_data->ttvn, tt_change);
3506         }
3507
3508         /* Recalculate the CRC for this orig_node and store it */
3509         batadv_tt_global_update_crc(bat_priv, orig_node);
3510
3511         spin_unlock_bh(&orig_node->tt_lock);
3512
3513         /* Delete the tt_req_node from pending tt_requests list */
3514         spin_lock_bh(&bat_priv->tt.req_list_lock);
3515         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3516                 if (!batadv_compare_eth(node->addr, resp_src))
3517                         continue;
3518                 hlist_del_init(&node->list);
3519                 batadv_tt_req_node_put(node);
3520         }
3521
3522         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3523 out:
3524         if (orig_node)
3525                 batadv_orig_node_put(orig_node);
3526 }
3527
3528 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3529 {
3530         struct batadv_tt_roam_node *node, *safe;
3531
3532         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3533
3534         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3535                 list_del(&node->list);
3536                 kmem_cache_free(batadv_tt_roam_cache, node);
3537         }
3538
3539         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3540 }
3541
3542 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3543 {
3544         struct batadv_tt_roam_node *node, *safe;
3545
3546         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3547         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3548                 if (!batadv_has_timed_out(node->first_time,
3549                                           BATADV_ROAMING_MAX_TIME))
3550                         continue;
3551
3552                 list_del(&node->list);
3553                 kmem_cache_free(batadv_tt_roam_cache, node);
3554         }
3555         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3556 }
3557
3558 /**
3559  * batadv_tt_check_roam_count - check if a client has roamed too frequently
3560  * @bat_priv: the bat priv with all the soft interface information
3561  * @client: mac address of the roaming client
3562  *
3563  * This function checks whether the client already reached the
3564  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3565  * will not be sent.
3566  *
3567  * Return: true if the ROAMING_ADV can be sent, false otherwise
3568  */
3569 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3570 {
3571         struct batadv_tt_roam_node *tt_roam_node;
3572         bool ret = false;
3573
3574         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3575         /* The new tt_req will be issued only if I'm not waiting for a
3576          * reply from the same orig_node yet
3577          */
3578         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3579                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3580                         continue;
3581
3582                 if (batadv_has_timed_out(tt_roam_node->first_time,
3583                                          BATADV_ROAMING_MAX_TIME))
3584                         continue;
3585
3586                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3587                         /* Sorry, you roamed too many times! */
3588                         goto unlock;
3589                 ret = true;
3590                 break;
3591         }
3592
3593         if (!ret) {
3594                 tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
3595                                                 GFP_ATOMIC);
3596                 if (!tt_roam_node)
3597                         goto unlock;
3598
3599                 tt_roam_node->first_time = jiffies;
3600                 atomic_set(&tt_roam_node->counter,
3601                            BATADV_ROAMING_MAX_COUNT - 1);
3602                 ether_addr_copy(tt_roam_node->addr, client);
3603
3604                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3605                 ret = true;
3606         }
3607
3608 unlock:
3609         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3610         return ret;
3611 }
3612
3613 /**
3614  * batadv_send_roam_adv - send a roaming advertisement message
3615  * @bat_priv: the bat priv with all the soft interface information
3616  * @client: mac address of the roaming client
3617  * @vid: VLAN identifier
3618  * @orig_node: message destination
3619  *
3620  * Send a ROAMING_ADV message to the node which was previously serving this
3621  * client. This is done to inform the node that from now on all traffic destined
3622  * for this particular roamed client has to be forwarded to the sender of the
3623  * roaming message.
3624  */
3625 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3626                                  unsigned short vid,
3627                                  struct batadv_orig_node *orig_node)
3628 {
3629         struct batadv_hard_iface *primary_if;
3630         struct batadv_tvlv_roam_adv tvlv_roam;
3631
3632         primary_if = batadv_primary_if_get_selected(bat_priv);
3633         if (!primary_if)
3634                 goto out;
3635
3636         /* before going on we have to check whether the client has
3637          * already roamed to us too many times
3638          */
3639         if (!batadv_tt_check_roam_count(bat_priv, client))
3640                 goto out;
3641
3642         batadv_dbg(BATADV_DBG_TT, bat_priv,
3643                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3644                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3645
3646         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3647
3648         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3649         tvlv_roam.vid = htons(vid);
3650
3651         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3652                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3653                                  &tvlv_roam, sizeof(tvlv_roam));
3654
3655 out:
3656         if (primary_if)
3657                 batadv_hardif_put(primary_if);
3658 }
3659
3660 static void batadv_tt_purge(struct work_struct *work)
3661 {
3662         struct delayed_work *delayed_work;
3663         struct batadv_priv_tt *priv_tt;
3664         struct batadv_priv *bat_priv;
3665
3666         delayed_work = to_delayed_work(work);
3667         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3668         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3669
3670         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3671         batadv_tt_global_purge(bat_priv);
3672         batadv_tt_req_purge(bat_priv);
3673         batadv_tt_roam_purge(bat_priv);
3674
3675         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3676                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3677 }
3678
3679 void batadv_tt_free(struct batadv_priv *bat_priv)
3680 {
3681         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3682         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3683
3684         cancel_delayed_work_sync(&bat_priv->tt.work);
3685
3686         batadv_tt_local_table_free(bat_priv);
3687         batadv_tt_global_table_free(bat_priv);
3688         batadv_tt_req_list_free(bat_priv);
3689         batadv_tt_changes_list_free(bat_priv);
3690         batadv_tt_roam_list_free(bat_priv);
3691
3692         kfree(bat_priv->tt.last_changeset);
3693 }
3694
3695 /**
3696  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3697  *  table and possibly count them in the TT size
3698  * @bat_priv: the bat priv with all the soft interface information
3699  * @flags: the flag to switch
3700  * @enable: whether to set or unset the flag
3701  * @count: whether to increase the TT size by the number of changed entries
3702  */
3703 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3704                                       bool enable, bool count)
3705 {
3706         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3707         struct batadv_tt_common_entry *tt_common_entry;
3708         u16 changed_num = 0;
3709         struct hlist_head *head;
3710         u32 i;
3711
3712         if (!hash)
3713                 return;
3714
3715         for (i = 0; i < hash->size; i++) {
3716                 head = &hash->table[i];
3717
3718                 rcu_read_lock();
3719                 hlist_for_each_entry_rcu(tt_common_entry,
3720                                          head, hash_entry) {
3721                         if (enable) {
3722                                 if ((tt_common_entry->flags & flags) == flags)
3723                                         continue;
3724                                 tt_common_entry->flags |= flags;
3725                         } else {
3726                                 if (!(tt_common_entry->flags & flags))
3727                                         continue;
3728                                 tt_common_entry->flags &= ~flags;
3729                         }
3730                         changed_num++;
3731
3732                         if (!count)
3733                                 continue;
3734
3735                         batadv_tt_local_size_inc(bat_priv,
3736                                                  tt_common_entry->vid);
3737                 }
3738                 rcu_read_unlock();
3739         }
3740 }
3741
3742 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3743 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3744 {
3745         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3746         struct batadv_tt_common_entry *tt_common;
3747         struct batadv_tt_local_entry *tt_local;
3748         struct hlist_node *node_tmp;
3749         struct hlist_head *head;
3750         spinlock_t *list_lock; /* protects write access to the hash lists */
3751         u32 i;
3752
3753         if (!hash)
3754                 return;
3755
3756         for (i = 0; i < hash->size; i++) {
3757                 head = &hash->table[i];
3758                 list_lock = &hash->list_locks[i];
3759
3760                 spin_lock_bh(list_lock);
3761                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3762                                           hash_entry) {
3763                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3764                                 continue;
3765
3766                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3767                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3768                                    tt_common->addr,
3769                                    BATADV_PRINT_VID(tt_common->vid));
3770
3771                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3772                         hlist_del_rcu(&tt_common->hash_entry);
3773                         tt_local = container_of(tt_common,
3774                                                 struct batadv_tt_local_entry,
3775                                                 common);
3776
3777                         batadv_tt_local_entry_put(tt_local);
3778                 }
3779                 spin_unlock_bh(list_lock);
3780         }
3781 }
3782
3783 /**
3784  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3785  *  which have been queued in the time since the last commit
3786  * @bat_priv: the bat priv with all the soft interface information
3787  *
3788  * Caller must hold tt->commit_lock.
3789  */
3790 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3791 {
3792         lockdep_assert_held(&bat_priv->tt.commit_lock);
3793
3794         /* Update multicast addresses in local translation table */
3795         batadv_mcast_mla_update(bat_priv);
3796
3797         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3798                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3799                         batadv_tt_tvlv_container_update(bat_priv);
3800                 return;
3801         }
3802
3803         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3804
3805         batadv_tt_local_purge_pending_clients(bat_priv);
3806         batadv_tt_local_update_crc(bat_priv);
3807
3808         /* Increment the TTVN only once per OGM interval */
3809         atomic_inc(&bat_priv->tt.vn);
3810         batadv_dbg(BATADV_DBG_TT, bat_priv,
3811                    "Local changes committed, updating to ttvn %u\n",
3812                    (u8)atomic_read(&bat_priv->tt.vn));
3813
3814         /* reset the sending counter */
3815         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3816         batadv_tt_tvlv_container_update(bat_priv);
3817 }
3818
3819 /**
3820  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3821  *  have been queued in the time since the last commit
3822  * @bat_priv: the bat priv with all the soft interface information
3823  */
3824 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3825 {
3826         spin_lock_bh(&bat_priv->tt.commit_lock);
3827         batadv_tt_local_commit_changes_nolock(bat_priv);
3828         spin_unlock_bh(&bat_priv->tt.commit_lock);
3829 }
3830
3831 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3832                            unsigned short vid)
3833 {
3834         struct batadv_tt_local_entry *tt_local_entry = NULL;
3835         struct batadv_tt_global_entry *tt_global_entry = NULL;
3836         struct batadv_softif_vlan *vlan;
3837         bool ret = false;
3838
3839         vlan = batadv_softif_vlan_get(bat_priv, vid);
3840         if (!vlan)
3841                 return false;
3842
3843         if (!atomic_read(&vlan->ap_isolation))
3844                 goto out;
3845
3846         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3847         if (!tt_local_entry)
3848                 goto out;
3849
3850         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3851         if (!tt_global_entry)
3852                 goto out;
3853
3854         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3855                 goto out;
3856
3857         ret = true;
3858
3859 out:
3860         batadv_softif_vlan_put(vlan);
3861         if (tt_global_entry)
3862                 batadv_tt_global_entry_put(tt_global_entry);
3863         if (tt_local_entry)
3864                 batadv_tt_local_entry_put(tt_local_entry);
3865         return ret;
3866 }
3867
3868 /**
3869  * batadv_tt_update_orig - update global translation table with new tt
3870  *  information received via ogms
3871  * @bat_priv: the bat priv with all the soft interface information
3872  * @orig_node: the orig_node of the ogm
3873  * @tt_buff: pointer to the first tvlv VLAN entry
3874  * @tt_num_vlan: number of tvlv VLAN entries
3875  * @tt_change: pointer to the first entry in the TT buffer
3876  * @tt_num_changes: number of tt changes inside the tt buffer
3877  * @ttvn: translation table version number of this changeset
3878  */
3879 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3880                                   struct batadv_orig_node *orig_node,
3881                                   const void *tt_buff, u16 tt_num_vlan,
3882                                   struct batadv_tvlv_tt_change *tt_change,
3883                                   u16 tt_num_changes, u8 ttvn)
3884 {
3885         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3886         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3887         bool full_table = true;
3888         bool has_tt_init;
3889
3890         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3891         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3892                                &orig_node->capa_initialized);
3893
3894         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3895          * increased by one -> we can apply the attached changes
3896          */
3897         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3898                 /* the OGM could not contain the changes due to their size or
3899                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3900                  * times.
3901                  * In this case send a tt request
3902                  */
3903                 if (!tt_num_changes) {
3904                         full_table = false;
3905                         goto request_table;
3906                 }
3907
3908                 spin_lock_bh(&orig_node->tt_lock);
3909
3910                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3911                                          ttvn, tt_change);
3912
3913                 /* Even if we received the precomputed crc with the OGM, we
3914                  * prefer to recompute it to spot any possible inconsistency
3915                  * in the global table
3916                  */
3917                 batadv_tt_global_update_crc(bat_priv, orig_node);
3918
3919                 spin_unlock_bh(&orig_node->tt_lock);
3920
3921                 /* The ttvn alone is not enough to guarantee consistency
3922                  * because a single value could represent different states
3923                  * (due to the wrap around). Thus a node has to check whether
3924                  * the resulting table (after applying the changes) is still
3925                  * consistent or not. E.g. a node could disconnect while its
3926                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3927                  * checking the CRC value is mandatory to detect the
3928                  * inconsistency
3929                  */
3930                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3931                                                 tt_num_vlan))
3932                         goto request_table;
3933         } else {
3934                 /* if we missed more than one change or our tables are not
3935                  * in sync anymore -> request fresh tt data
3936                  */
3937                 if (!has_tt_init || ttvn != orig_ttvn ||
3938                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3939                                                 tt_num_vlan)) {
3940 request_table:
3941                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3942                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3943                                    orig_node->orig, ttvn, orig_ttvn,
3944                                    tt_num_changes);
3945                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3946                                                tt_vlan, tt_num_vlan,
3947                                                full_table);
3948                         return;
3949                 }
3950         }
3951 }
3952
3953 /**
3954  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3955  * @bat_priv: the bat priv with all the soft interface information
3956  * @addr: the mac address of the client to check
3957  * @vid: VLAN identifier
3958  *
3959  * Return: true if we know that the client has moved from its old originator
3960  * to another one. This entry is still kept for consistency purposes and will be
3961  * deleted later by a DEL or because of timeout
3962  */
3963 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3964                                         u8 *addr, unsigned short vid)
3965 {
3966         struct batadv_tt_global_entry *tt_global_entry;
3967         bool ret = false;
3968
3969         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3970         if (!tt_global_entry)
3971                 goto out;
3972
3973         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3974         batadv_tt_global_entry_put(tt_global_entry);
3975 out:
3976         return ret;
3977 }
3978
3979 /**
3980  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3981  * @bat_priv: the bat priv with all the soft interface information
3982  * @addr: the mac address of the local client to query
3983  * @vid: VLAN identifier
3984  *
3985  * Return: true if the local client is known to be roaming (it is not served by
3986  * this node anymore) or not. If yes, the client is still present in the table
3987  * to keep the latter consistent with the node TTVN
3988  */
3989 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3990                                        u8 *addr, unsigned short vid)
3991 {
3992         struct batadv_tt_local_entry *tt_local_entry;
3993         bool ret = false;
3994
3995         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3996         if (!tt_local_entry)
3997                 goto out;
3998
3999         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4000         batadv_tt_local_entry_put(tt_local_entry);
4001 out:
4002         return ret;
4003 }
4004
4005 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
4006                                           struct batadv_orig_node *orig_node,
4007                                           const unsigned char *addr,
4008                                           unsigned short vid)
4009 {
4010         bool ret = false;
4011
4012         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
4013                                   BATADV_TT_CLIENT_TEMP,
4014                                   atomic_read(&orig_node->last_ttvn)))
4015                 goto out;
4016
4017         batadv_dbg(BATADV_DBG_TT, bat_priv,
4018                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
4019                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
4020         ret = true;
4021 out:
4022         return ret;
4023 }
4024
4025 /**
4026  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
4027  *  maximum packet size that can be transported through the mesh
4028  * @soft_iface: netdev struct of the mesh interface
4029  *
4030  * Remove entries older than 'timeout' and half timeout if more entries need
4031  * to be removed.
4032  */
4033 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
4034 {
4035         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
4036         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
4037         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
4038         bool reduced = false;
4039
4040         spin_lock_bh(&bat_priv->tt.commit_lock);
4041
4042         while (true) {
4043                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
4044                 if (packet_size_max >= table_size)
4045                         break;
4046
4047                 batadv_tt_local_purge(bat_priv, timeout);
4048                 batadv_tt_local_purge_pending_clients(bat_priv);
4049
4050                 timeout /= 2;
4051                 reduced = true;
4052                 net_ratelimited_function(batadv_info, soft_iface,
4053                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
4054                                          packet_size_max);
4055         }
4056
4057         /* commit these changes immediately, to avoid synchronization problem
4058          * with the TTVN
4059          */
4060         if (reduced)
4061                 batadv_tt_local_commit_changes_nolock(bat_priv);
4062
4063         spin_unlock_bh(&bat_priv->tt.commit_lock);
4064 }
4065
4066 /**
4067  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
4068  * @bat_priv: the bat priv with all the soft interface information
4069  * @orig: the orig_node of the ogm
4070  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
4071  * @tvlv_value: tvlv buffer containing the gateway data
4072  * @tvlv_value_len: tvlv buffer length
4073  */
4074 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
4075                                           struct batadv_orig_node *orig,
4076                                           u8 flags, void *tvlv_value,
4077                                           u16 tvlv_value_len)
4078 {
4079         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4080         struct batadv_tvlv_tt_change *tt_change;
4081         struct batadv_tvlv_tt_data *tt_data;
4082         u16 num_entries, num_vlan;
4083
4084         if (tvlv_value_len < sizeof(*tt_data))
4085                 return;
4086
4087         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4088         tvlv_value_len -= sizeof(*tt_data);
4089
4090         num_vlan = ntohs(tt_data->num_vlan);
4091
4092         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
4093                 return;
4094
4095         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
4096         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
4097         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
4098
4099         num_entries = batadv_tt_entries(tvlv_value_len);
4100
4101         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
4102                               num_entries, tt_data->ttvn);
4103 }
4104
4105 /**
4106  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
4107  *  container
4108  * @bat_priv: the bat priv with all the soft interface information
4109  * @src: mac address of tt tvlv sender
4110  * @dst: mac address of tt tvlv recipient
4111  * @tvlv_value: tvlv buffer containing the tt data
4112  * @tvlv_value_len: tvlv buffer length
4113  *
4114  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
4115  * otherwise.
4116  */
4117 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4118                                              u8 *src, u8 *dst,
4119                                              void *tvlv_value,
4120                                              u16 tvlv_value_len)
4121 {
4122         struct batadv_tvlv_tt_data *tt_data;
4123         u16 tt_vlan_len, tt_num_entries;
4124         char tt_flag;
4125         bool ret;
4126
4127         if (tvlv_value_len < sizeof(*tt_data))
4128                 return NET_RX_SUCCESS;
4129
4130         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4131         tvlv_value_len -= sizeof(*tt_data);
4132
4133         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
4134         tt_vlan_len *= ntohs(tt_data->num_vlan);
4135
4136         if (tvlv_value_len < tt_vlan_len)
4137                 return NET_RX_SUCCESS;
4138
4139         tvlv_value_len -= tt_vlan_len;
4140         tt_num_entries = batadv_tt_entries(tvlv_value_len);
4141
4142         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
4143         case BATADV_TT_REQUEST:
4144                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
4145
4146                 /* If this node cannot provide a TT response the tt_request is
4147                  * forwarded
4148                  */
4149                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
4150                 if (!ret) {
4151                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
4152                                 tt_flag = 'F';
4153                         else
4154                                 tt_flag = '.';
4155
4156                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4157                                    "Routing TT_REQUEST to %pM [%c]\n",
4158                                    dst, tt_flag);
4159                         /* tvlv API will re-route the packet */
4160                         return NET_RX_DROP;
4161                 }
4162                 break;
4163         case BATADV_TT_RESPONSE:
4164                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
4165
4166                 if (batadv_is_my_mac(bat_priv, dst)) {
4167                         batadv_handle_tt_response(bat_priv, tt_data,
4168                                                   src, tt_num_entries);
4169                         return NET_RX_SUCCESS;
4170                 }
4171
4172                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
4173                         tt_flag =  'F';
4174                 else
4175                         tt_flag = '.';
4176
4177                 batadv_dbg(BATADV_DBG_TT, bat_priv,
4178                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
4179
4180                 /* tvlv API will re-route the packet */
4181                 return NET_RX_DROP;
4182         }
4183
4184         return NET_RX_SUCCESS;
4185 }
4186
4187 /**
4188  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
4189  * @bat_priv: the bat priv with all the soft interface information
4190  * @src: mac address of tt tvlv sender
4191  * @dst: mac address of tt tvlv recipient
4192  * @tvlv_value: tvlv buffer containing the tt data
4193  * @tvlv_value_len: tvlv buffer length
4194  *
4195  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
4196  * otherwise.
4197  */
4198 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4199                                                u8 *src, u8 *dst,
4200                                                void *tvlv_value,
4201                                                u16 tvlv_value_len)
4202 {
4203         struct batadv_tvlv_roam_adv *roaming_adv;
4204         struct batadv_orig_node *orig_node = NULL;
4205
4206         /* If this node is not the intended recipient of the
4207          * roaming advertisement the packet is forwarded
4208          * (the tvlv API will re-route the packet).
4209          */
4210         if (!batadv_is_my_mac(bat_priv, dst))
4211                 return NET_RX_DROP;
4212
4213         if (tvlv_value_len < sizeof(*roaming_adv))
4214                 goto out;
4215
4216         orig_node = batadv_orig_hash_find(bat_priv, src);
4217         if (!orig_node)
4218                 goto out;
4219
4220         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
4221         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
4222
4223         batadv_dbg(BATADV_DBG_TT, bat_priv,
4224                    "Received ROAMING_ADV from %pM (client %pM)\n",
4225                    src, roaming_adv->client);
4226
4227         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
4228                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
4229                              atomic_read(&orig_node->last_ttvn) + 1);
4230
4231 out:
4232         if (orig_node)
4233                 batadv_orig_node_put(orig_node);
4234         return NET_RX_SUCCESS;
4235 }
4236
4237 /**
4238  * batadv_tt_init - initialise the translation table internals
4239  * @bat_priv: the bat priv with all the soft interface information
4240  *
4241  * Return: 0 on success or negative error number in case of failure.
4242  */
4243 int batadv_tt_init(struct batadv_priv *bat_priv)
4244 {
4245         int ret;
4246
4247         /* synchronized flags must be remote */
4248         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
4249
4250         ret = batadv_tt_local_init(bat_priv);
4251         if (ret < 0)
4252                 return ret;
4253
4254         ret = batadv_tt_global_init(bat_priv);
4255         if (ret < 0)
4256                 return ret;
4257
4258         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
4259                                      batadv_tt_tvlv_unicast_handler_v1,
4260                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
4261
4262         batadv_tvlv_handler_register(bat_priv, NULL,
4263                                      batadv_roam_tvlv_unicast_handler_v1,
4264                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
4265
4266         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
4267         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
4268                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
4269
4270         return 1;
4271 }
4272
4273 /**
4274  * batadv_tt_global_is_isolated - check if a client is marked as isolated
4275  * @bat_priv: the bat priv with all the soft interface information
4276  * @addr: the mac address of the client
4277  * @vid: the identifier of the VLAN where this client is connected
4278  *
4279  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
4280  * otherwise
4281  */
4282 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
4283                                   const u8 *addr, unsigned short vid)
4284 {
4285         struct batadv_tt_global_entry *tt;
4286         bool ret;
4287
4288         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
4289         if (!tt)
4290                 return false;
4291
4292         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
4293
4294         batadv_tt_global_entry_put(tt);
4295
4296         return ret;
4297 }
4298
4299 /**
4300  * batadv_tt_cache_init - Initialize tt memory object cache
4301  *
4302  * Return: 0 on success or negative error number in case of failure.
4303  */
4304 int __init batadv_tt_cache_init(void)
4305 {
4306         size_t tl_size = sizeof(struct batadv_tt_local_entry);
4307         size_t tg_size = sizeof(struct batadv_tt_global_entry);
4308         size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
4309         size_t tt_change_size = sizeof(struct batadv_tt_change_node);
4310         size_t tt_req_size = sizeof(struct batadv_tt_req_node);
4311         size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);
4312
4313         batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
4314                                             SLAB_HWCACHE_ALIGN, NULL);
4315         if (!batadv_tl_cache)
4316                 return -ENOMEM;
4317
4318         batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
4319                                             SLAB_HWCACHE_ALIGN, NULL);
4320         if (!batadv_tg_cache)
4321                 goto err_tt_tl_destroy;
4322
4323         batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
4324                                                  tt_orig_size, 0,
4325                                                  SLAB_HWCACHE_ALIGN, NULL);
4326         if (!batadv_tt_orig_cache)
4327                 goto err_tt_tg_destroy;
4328
4329         batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
4330                                                    tt_change_size, 0,
4331                                                    SLAB_HWCACHE_ALIGN, NULL);
4332         if (!batadv_tt_change_cache)
4333                 goto err_tt_orig_destroy;
4334
4335         batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
4336                                                 tt_req_size, 0,
4337                                                 SLAB_HWCACHE_ALIGN, NULL);
4338         if (!batadv_tt_req_cache)
4339                 goto err_tt_change_destroy;
4340
4341         batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
4342                                                  tt_roam_size, 0,
4343                                                  SLAB_HWCACHE_ALIGN, NULL);
4344         if (!batadv_tt_roam_cache)
4345                 goto err_tt_req_destroy;
4346
4347         return 0;
4348
4349 err_tt_req_destroy:
4350         kmem_cache_destroy(batadv_tt_req_cache);
4351         batadv_tt_req_cache = NULL;
4352 err_tt_change_destroy:
4353         kmem_cache_destroy(batadv_tt_change_cache);
4354         batadv_tt_change_cache = NULL;
4355 err_tt_orig_destroy:
4356         kmem_cache_destroy(batadv_tt_orig_cache);
4357         batadv_tt_orig_cache = NULL;
4358 err_tt_tg_destroy:
4359         kmem_cache_destroy(batadv_tg_cache);
4360         batadv_tg_cache = NULL;
4361 err_tt_tl_destroy:
4362         kmem_cache_destroy(batadv_tl_cache);
4363         batadv_tl_cache = NULL;
4364
4365         return -ENOMEM;
4366 }
4367
4368 /**
4369  * batadv_tt_cache_destroy - Destroy tt memory object cache
4370  */
4371 void batadv_tt_cache_destroy(void)
4372 {
4373         kmem_cache_destroy(batadv_tl_cache);
4374         kmem_cache_destroy(batadv_tg_cache);
4375         kmem_cache_destroy(batadv_tt_orig_cache);
4376         kmem_cache_destroy(batadv_tt_change_cache);
4377         kmem_cache_destroy(batadv_tt_req_cache);
4378         kmem_cache_destroy(batadv_tt_roam_cache);
4379 }