net/batman-adv/translation-table.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2007-2018  B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "translation-table.h"
  20 #include "main.h"
  21
  22 #include <linux/atomic.h>
  23 #include <linux/bitops.h>
  24 #include <linux/build_bug.h>
  25 #include <linux/byteorder/generic.h>
  26 #include <linux/cache.h>
  27 #include <linux/compiler.h>
  28 #include <linux/crc32c.h>
  29 #include <linux/errno.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/gfp.h>
  32 #include <linux/if_ether.h>
  33 #include <linux/init.h>
  34 #include <linux/jhash.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kref.h>
  38 #include <linux/list.h>
  39 #include <linux/lockdep.h>
  40 #include <linux/net.h>
  41 #include <linux/netdevice.h>
  42 #include <linux/netlink.h>
  43 #include <linux/rculist.h>
  44 #include <linux/rcupdate.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/skbuff.h>
  47 #include <linux/slab.h>
  48 #include <linux/spinlock.h>
  49 #include <linux/stddef.h>
  50 #include <linux/string.h>
  51 #include <linux/workqueue.h>
  52 #include <net/genetlink.h>
  53 #include <net/netlink.h>
  54 #include <net/sock.h>
  55 #include <uapi/linux/batadv_packet.h>
  56 #include <uapi/linux/batman_adv.h>
  57
  58 #include "bridge_loop_avoidance.h"
  59 #include "hard-interface.h"
  60 #include "hash.h"
  61 #include "log.h"
  62 #include "netlink.h"
  63 #include "originator.h"
  64 #include "soft-interface.h"
  65 #include "tvlv.h"
  66
  67 static struct kmem_cache *batadv_tl_cache __read_mostly;
  68 static struct kmem_cache *batadv_tg_cache __read_mostly;
  69 static struct kmem_cache *batadv_tt_orig_cache __read_mostly;
  70 static struct kmem_cache *batadv_tt_change_cache __read_mostly;
  71 static struct kmem_cache *batadv_tt_req_cache __read_mostly;
  72 static struct kmem_cache *batadv_tt_roam_cache __read_mostly;
  73
  74 /* hash class keys */
  75 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  76 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  77
  78 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
  79                                  unsigned short vid,
  80                                  struct batadv_orig_node *orig_node);
  81 static void batadv_tt_purge(struct work_struct *work);
  82 static void
  83 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  84 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  85                                  struct batadv_orig_node *orig_node,
  86                                  const unsigned char *addr,
  87                                  unsigned short vid, const char *message,
  88                                  bool roaming);
  89
  90 /**
  91  * batadv_compare_tt() - check if two TT entries are the same
  92  * @node: the list element pointer of the first TT entry
  93  * @data2: pointer to the tt_common_entry of the second TT entry
  94  *
  95  * Compare the MAC address and the VLAN ID of the two TT entries and check if
  96  * they are the same TT client.
  97  * Return: true if the two TT clients are the same, false otherwise
  98  */
  99 static bool batadv_compare_tt(const struct hlist_node *node, const void *data2)
 100 {
 101         const void *data1 = container_of(node, struct batadv_tt_common_entry,
 102                                          hash_entry);
 103         const struct batadv_tt_common_entry *tt1 = data1;
 104         const struct batadv_tt_common_entry *tt2 = data2;
 105
 106         return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
 107 }
 108
 109 /**
 110  * batadv_choose_tt() - return the index of the tt entry in the hash table
 111  * @data: pointer to the tt_common_entry object to map
 112  * @size: the size of the hash table
 113  *
 114  * Return: the hash index where the object represented by 'data' should be
 115  * stored at.
 116  */
 117 static inline u32 batadv_choose_tt(const void *data, u32 size)
 118 {
 119         struct batadv_tt_common_entry *tt;
 120         u32 hash = 0;
 121
 122         tt = (struct batadv_tt_common_entry *)data;
 123         hash = jhash(&tt->addr, ETH_ALEN, hash);
 124         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
 125
 126         return hash % size;
 127 }
 128
 129 /**
 130  * batadv_tt_hash_find() - look for a client in the given hash table
 131  * @hash: the hash table to search
 132  * @addr: the mac address of the client to look for
 133  * @vid: VLAN identifier
 134  *
 135  * Return: a pointer to the tt_common struct belonging to the searched client if
 136  * found, NULL otherwise.
 137  */
 138 static struct batadv_tt_common_entry *
 139 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
 140                     unsigned short vid)
 141 {
 142         struct hlist_head *head;
 143         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 144         u32 index;
 145
 146         if (!hash)
 147                 return NULL;
 148
 149         ether_addr_copy(to_search.addr, addr);
 150         to_search.vid = vid;
 151
 152         index = batadv_choose_tt(&to_search, hash->size);
 153         head = &hash->table[index];
 154
 155         rcu_read_lock();
 156         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 157                 if (!batadv_compare_eth(tt, addr))
 158                         continue;
 159
 160                 if (tt->vid != vid)
 161                         continue;
 162
 163                 if (!kref_get_unless_zero(&tt->refcount))
 164                         continue;
 165
 166                 tt_tmp = tt;
 167                 break;
 168         }
 169         rcu_read_unlock();
 170
 171         return tt_tmp;
 172 }
 173
 174 /**
 175  * batadv_tt_local_hash_find() - search the local table for a given client
 176  * @bat_priv: the bat priv with all the soft interface information
 177  * @addr: the mac address of the client to look for
 178  * @vid: VLAN identifier
 179  *
 180  * Return: a pointer to the corresponding tt_local_entry struct if the client is
 181  * found, NULL otherwise.
 182  */
 183 static struct batadv_tt_local_entry *
 184 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 185                           unsigned short vid)
 186 {
 187         struct batadv_tt_common_entry *tt_common_entry;
 188         struct batadv_tt_local_entry *tt_local_entry = NULL;
 189
 190         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 191                                               vid);
 192         if (tt_common_entry)
 193                 tt_local_entry = container_of(tt_common_entry,
 194                                               struct batadv_tt_local_entry,
 195                                               common);
 196         return tt_local_entry;
 197 }
 198
 199 /**
 200  * batadv_tt_global_hash_find() - search the global table for a given client
 201  * @bat_priv: the bat priv with all the soft interface information
 202  * @addr: the mac address of the client to look for
 203  * @vid: VLAN identifier
 204  *
 205  * Return: a pointer to the corresponding tt_global_entry struct if the client
 206  * is found, NULL otherwise.
 207  */
 208 static struct batadv_tt_global_entry *
 209 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 210                            unsigned short vid)
 211 {
 212         struct batadv_tt_common_entry *tt_common_entry;
 213         struct batadv_tt_global_entry *tt_global_entry = NULL;
 214
 215         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 216                                               vid);
 217         if (tt_common_entry)
 218                 tt_global_entry = container_of(tt_common_entry,
 219                                                struct batadv_tt_global_entry,
 220                                                common);
 221         return tt_global_entry;
 222 }
 223
 224 /**
 225  * batadv_tt_local_entry_free_rcu() - free the tt_local_entry
 226  * @rcu: rcu pointer of the tt_local_entry
 227  */
 228 static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
 229 {
 230         struct batadv_tt_local_entry *tt_local_entry;
 231
 232         tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
 233                                       common.rcu);
 234
 235         kmem_cache_free(batadv_tl_cache, tt_local_entry);
 236 }
 237
 238 /**
 239  * batadv_tt_local_entry_release() - release tt_local_entry from lists and queue
 240  *  for free after rcu grace period
 241  * @ref: kref pointer of the nc_node
 242  */
 243 static void batadv_tt_local_entry_release(struct kref *ref)
 244 {
 245         struct batadv_tt_local_entry *tt_local_entry;
 246
 247         tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
 248                                       common.refcount);
 249
 250         batadv_softif_vlan_put(tt_local_entry->vlan);
 251
 252         call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu);
 253 }
 254
 255 /**
 256  * batadv_tt_local_entry_put() - decrement the tt_local_entry refcounter and
 257  *  possibly release it
 258  * @tt_local_entry: tt_local_entry to be free'd
 259  */
 260 static void
 261 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
 262 {
 263         kref_put(&tt_local_entry->common.refcount,
 264                  batadv_tt_local_entry_release);
 265 }
 266
 267 /**
 268  * batadv_tt_global_entry_free_rcu() - free the tt_global_entry
 269  * @rcu: rcu pointer of the tt_global_entry
 270  */
 271 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
 272 {
 273         struct batadv_tt_global_entry *tt_global_entry;
 274
 275         tt_global_entry = container_of(rcu, struct batadv_tt_global_entry,
 276                                        common.rcu);
 277
 278         kmem_cache_free(batadv_tg_cache, tt_global_entry);
 279 }
 280
 281 /**
 282  * batadv_tt_global_entry_release() - release tt_global_entry from lists and
 283  *  queue for free after rcu grace period
 284  * @ref: kref pointer of the nc_node
 285  */
 286 static void batadv_tt_global_entry_release(struct kref *ref)
 287 {
 288         struct batadv_tt_global_entry *tt_global_entry;
 289
 290         tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
 291                                        common.refcount);
 292
 293         batadv_tt_global_del_orig_list(tt_global_entry);
 294
 295         call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu);
 296 }
 297
 298 /**
 299  * batadv_tt_global_entry_put() - decrement the tt_global_entry refcounter and
 300  *  possibly release it
 301  * @tt_global_entry: tt_global_entry to be free'd
 302  */
 303 static void
 304 batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
 305 {
 306         kref_put(&tt_global_entry->common.refcount,
 307                  batadv_tt_global_entry_release);
 308 }
 309
 310 /**
 311  * batadv_tt_global_hash_count() - count the number of orig entries
 312  * @bat_priv: the bat priv with all the soft interface information
 313  * @addr: the mac address of the client to count entries for
 314  * @vid: VLAN identifier
 315  *
 316  * Return: the number of originators advertising the given address/data
 317  * (excluding ourself).
 318  */
 319 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
 320                                 const u8 *addr, unsigned short vid)
 321 {
 322         struct batadv_tt_global_entry *tt_global_entry;
 323         int count;
 324
 325         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 326         if (!tt_global_entry)
 327                 return 0;
 328
 329         count = atomic_read(&tt_global_entry->orig_list_count);
 330         batadv_tt_global_entry_put(tt_global_entry);
 331
 332         return count;
 333 }
 334
 335 /**
 336  * batadv_tt_local_size_mod() - change the size by v of the local table
 337  *  identified by vid
 338  * @bat_priv: the bat priv with all the soft interface information
 339  * @vid: the VLAN identifier of the sub-table to change
 340  * @v: the amount to sum to the local table size
 341  */
 342 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 343                                      unsigned short vid, int v)
 344 {
 345         struct batadv_softif_vlan *vlan;
 346
 347         vlan = batadv_softif_vlan_get(bat_priv, vid);
 348         if (!vlan)
 349                 return;
 350
 351         atomic_add(v, &vlan->tt.num_entries);
 352
 353         batadv_softif_vlan_put(vlan);
 354 }
 355
 356 /**
 357  * batadv_tt_local_size_inc() - increase by one the local table size for the
 358  *  given vid
 359  * @bat_priv: the bat priv with all the soft interface information
 360  * @vid: the VLAN identifier
 361  */
 362 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 363                                      unsigned short vid)
 364 {
 365         batadv_tt_local_size_mod(bat_priv, vid, 1);
 366 }
 367
 368 /**
 369  * batadv_tt_local_size_dec() - decrease by one the local table size for the
 370  *  given vid
 371  * @bat_priv: the bat priv with all the soft interface information
 372  * @vid: the VLAN identifier
 373  */
 374 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 375                                      unsigned short vid)
 376 {
 377         batadv_tt_local_size_mod(bat_priv, vid, -1);
 378 }
 379
 380 /**
 381  * batadv_tt_global_size_mod() - change the size by v of the global table
 382  *  for orig_node identified by vid
 383  * @orig_node: the originator for which the table has to be modified
 384  * @vid: the VLAN identifier
 385  * @v: the amount to sum to the global table size
 386  */
 387 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 388                                       unsigned short vid, int v)
 389 {
 390         struct batadv_orig_node_vlan *vlan;
 391
 392         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 393         if (!vlan)
 394                 return;
 395
 396         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 397                 spin_lock_bh(&orig_node->vlan_list_lock);
 398                 if (!hlist_unhashed(&vlan->list)) {
 399                         hlist_del_init_rcu(&vlan->list);
 400                         batadv_orig_node_vlan_put(vlan);
 401                 }
 402                 spin_unlock_bh(&orig_node->vlan_list_lock);
 403         }
 404
 405         batadv_orig_node_vlan_put(vlan);
 406 }
 407
 408 /**
 409  * batadv_tt_global_size_inc() - increase by one the global table size for the
 410  *  given vid
 411  * @orig_node: the originator which global table size has to be decreased
 412  * @vid: the vlan identifier
 413  */
 414 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 415                                       unsigned short vid)
 416 {
 417         batadv_tt_global_size_mod(orig_node, vid, 1);
 418 }
 419
 420 /**
 421  * batadv_tt_global_size_dec() - decrease by one the global table size for the
 422  *  given vid
 423  * @orig_node: the originator which global table size has to be decreased
 424  * @vid: the vlan identifier
 425  */
 426 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 427                                       unsigned short vid)
 428 {
 429         batadv_tt_global_size_mod(orig_node, vid, -1);
 430 }
 431
 432 /**
 433  * batadv_tt_orig_list_entry_free_rcu() - free the orig_entry
 434  * @rcu: rcu pointer of the orig_entry
 435  */
 436 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 437 {
 438         struct batadv_tt_orig_list_entry *orig_entry;
 439
 440         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 441
 442         kmem_cache_free(batadv_tt_orig_cache, orig_entry);
 443 }
 444
 445 /**
 446  * batadv_tt_orig_list_entry_release() - release tt orig entry from lists and
 447  *  queue for free after rcu grace period
 448  * @ref: kref pointer of the tt orig entry
 449  */
 450 static void batadv_tt_orig_list_entry_release(struct kref *ref)
 451 {
 452         struct batadv_tt_orig_list_entry *orig_entry;
 453
 454         orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
 455                                   refcount);
 456
 457         batadv_orig_node_put(orig_entry->orig_node);
 458         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 459 }
 460
 461 /**
 462  * batadv_tt_orig_list_entry_put() - decrement the tt orig entry refcounter and
 463  *  possibly release it
 464  * @orig_entry: tt orig entry to be free'd
 465  */
 466 static void
 467 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
 468 {
 469         kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
 470 }
 471
 472 /**
 473  * batadv_tt_local_event() - store a local TT event (ADD/DEL)
 474  * @bat_priv: the bat priv with all the soft interface information
 475  * @tt_local_entry: the TT entry involved in the event
 476  * @event_flags: flags to store in the event structure
 477  */
 478 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 479                                   struct batadv_tt_local_entry *tt_local_entry,
 480                                   u8 event_flags)
 481 {
 482         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 483         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 484         u8 flags = common->flags | event_flags;
 485         bool event_removed = false;
 486         bool del_op_requested, del_op_entry;
 487
 488         tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC);
 489         if (!tt_change_node)
 490                 return;
 491
 492         tt_change_node->change.flags = flags;
 493         memset(tt_change_node->change.reserved, 0,
 494                sizeof(tt_change_node->change.reserved));
 495         ether_addr_copy(tt_change_node->change.addr, common->addr);
 496         tt_change_node->change.vid = htons(common->vid);
 497
 498         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 499
 500         /* check for ADD+DEL or DEL+ADD events */
 501         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 502         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 503                                  list) {
 504                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 505                         continue;
 506
 507                 /* DEL+ADD in the same orig interval have no effect and can be
 508                  * removed to avoid silly behaviour on the receiver side. The
 509                  * other way around (ADD+DEL) can happen in case of roaming of
 510                  * a client still in the NEW state. Roaming of NEW clients is
 511                  * now possible due to automatically recognition of "temporary"
 512                  * clients
 513                  */
 514                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 515                 if (!del_op_requested && del_op_entry)
 516                         goto del;
 517                 if (del_op_requested && !del_op_entry)
 518                         goto del;
 519
 520                 /* this is a second add in the same originator interval. It
 521                  * means that flags have been changed: update them!
 522                  */
 523                 if (!del_op_requested && !del_op_entry)
 524                         entry->change.flags = flags;
 525
 526                 continue;
 527 del:
 528                 list_del(&entry->list);
 529                 kmem_cache_free(batadv_tt_change_cache, entry);
 530                 kmem_cache_free(batadv_tt_change_cache, tt_change_node);
 531                 event_removed = true;
 532                 goto unlock;
 533         }
 534
 535         /* track the change in the OGMinterval list */
 536         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 537
 538 unlock:
 539         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 540
 541         if (event_removed)
 542                 atomic_dec(&bat_priv->tt.local_changes);
 543         else
 544                 atomic_inc(&bat_priv->tt.local_changes);
 545 }
 546
 547 /**
 548  * batadv_tt_len() - compute length in bytes of given number of tt changes
 549  * @changes_num: number of tt changes
 550  *
 551  * Return: computed length in bytes.
 552  */
 553 static int batadv_tt_len(int changes_num)
 554 {
 555         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 556 }
 557
 558 /**
 559  * batadv_tt_entries() - compute the number of entries fitting in tt_len bytes
 560  * @tt_len: available space
 561  *
 562  * Return: the number of entries.
 563  */
 564 static u16 batadv_tt_entries(u16 tt_len)
 565 {
 566         return tt_len / batadv_tt_len(1);
 567 }
 568
 569 /**
 570  * batadv_tt_local_table_transmit_size() - calculates the local translation
 571  *  table size when transmitted over the air
 572  * @bat_priv: the bat priv with all the soft interface information
 573  *
 574  * Return: local translation table size in bytes.
 575  */
 576 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 577 {
 578         u16 num_vlan = 0;
 579         u16 tt_local_entries = 0;
 580         struct batadv_softif_vlan *vlan;
 581         int hdr_size;
 582
 583         rcu_read_lock();
 584         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 585                 num_vlan++;
 586                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 587         }
 588         rcu_read_unlock();
 589
 590         /* header size of tvlv encapsulated tt response payload */
 591         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 592         hdr_size += sizeof(struct batadv_tvlv_hdr);
 593         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 594         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 595
 596         return hdr_size + batadv_tt_len(tt_local_entries);
 597 }
 598
 599 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 600 {
 601         if (bat_priv->tt.local_hash)
 602                 return 0;
 603
 604         bat_priv->tt.local_hash = batadv_hash_new(1024);
 605
 606         if (!bat_priv->tt.local_hash)
 607                 return -ENOMEM;
 608
 609         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 610                                    &batadv_tt_local_hash_lock_class_key);
 611
 612         return 0;
 613 }
 614
 615 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 616                                   struct batadv_tt_global_entry *tt_global,
 617                                   const char *message)
 618 {
 619         batadv_dbg(BATADV_DBG_TT, bat_priv,
 620                    "Deleting global tt entry %pM (vid: %d): %s\n",
 621                    tt_global->common.addr,
 622                    batadv_print_vid(tt_global->common.vid), message);
 623
 624         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 625                            batadv_choose_tt, &tt_global->common);
 626         batadv_tt_global_entry_put(tt_global);
 627 }
 628
 629 /**
 630  * batadv_tt_local_add() - add a new client to the local table or update an
 631  *  existing client
 632  * @soft_iface: netdev struct of the mesh interface
 633  * @addr: the mac address of the client to add
 634  * @vid: VLAN identifier
 635  * @ifindex: index of the interface where the client is connected to (useful to
 636  *  identify wireless clients)
 637  * @mark: the value contained in the skb->mark field of the received packet (if
 638  *  any)
 639  *
 640  * Return: true if the client was successfully added, false otherwise.
 641  */
 642 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
 643                          unsigned short vid, int ifindex, u32 mark)
 644 {
 645         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 646         struct batadv_tt_local_entry *tt_local;
 647         struct batadv_tt_global_entry *tt_global = NULL;
 648         struct net *net = dev_net(soft_iface);
 649         struct batadv_softif_vlan *vlan;
 650         struct net_device *in_dev = NULL;
 651         struct batadv_hard_iface *in_hardif = NULL;
 652         struct hlist_head *head;
 653         struct batadv_tt_orig_list_entry *orig_entry;
 654         int hash_added, table_size, packet_size_max;
 655         bool ret = false;
 656         bool roamed_back = false;
 657         u8 remote_flags;
 658         u32 match_mark;
 659
 660         if (ifindex != BATADV_NULL_IFINDEX)
 661                 in_dev = dev_get_by_index(net, ifindex);
 662
 663         if (in_dev)
 664                 in_hardif = batadv_hardif_get_by_netdev(in_dev);
 665
 666         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 667
 668         if (!is_multicast_ether_addr(addr))
 669                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 670
 671         if (tt_local) {
 672                 tt_local->last_seen = jiffies;
 673                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 674                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 675                                    "Re-adding pending client %pM (vid: %d)\n",
 676                                    addr, batadv_print_vid(vid));
 677                         /* whatever the reason why the PENDING flag was set,
 678                          * this is a client which was enqueued to be removed in
 679                          * this orig_interval. Since it popped up again, the
 680                          * flag can be reset like it was never enqueued
 681                          */
 682                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 683                         goto add_event;
 684                 }
 685
 686                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 687                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 688                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 689                                    addr, batadv_print_vid(vid));
 690                         /* the ROAM flag is set because this client roamed away
 691                          * and the node got a roaming_advertisement message. Now
 692                          * that the client popped up again at its original
 693                          * location such flag can be unset
 694                          */
 695                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 696                         roamed_back = true;
 697                 }
 698                 goto check_roaming;
 699         }
 700
 701         /* Ignore the client if we cannot send it in a full table response. */
 702         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 703         table_size += batadv_tt_len(1);
 704         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 705         if (table_size > packet_size_max) {
 706                 net_ratelimited_function(batadv_info, soft_iface,
 707                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 708                                          table_size, packet_size_max, addr);
 709                 goto out;
 710         }
 711
 712         tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
 713         if (!tt_local)
 714                 goto out;
 715
 716         /* increase the refcounter of the related vlan */
 717         vlan = batadv_softif_vlan_get(bat_priv, vid);
 718         if (!vlan) {
 719                 net_ratelimited_function(batadv_info, soft_iface,
 720                                          "adding TT local entry %pM to non-existent VLAN %d\n",
 721                                          addr, batadv_print_vid(vid));
 722                 kmem_cache_free(batadv_tl_cache, tt_local);
 723                 tt_local = NULL;
 724                 goto out;
 725         }
 726
 727         batadv_dbg(BATADV_DBG_TT, bat_priv,
 728                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 729                    addr, batadv_print_vid(vid),
 730                    (u8)atomic_read(&bat_priv->tt.vn));
 731
 732         ether_addr_copy(tt_local->common.addr, addr);
 733         /* The local entry has to be marked as NEW to avoid to send it in
 734          * a full table response going out before the next ttvn increment
 735          * (consistency check)
 736          */
 737         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 738         tt_local->common.vid = vid;
 739         if (batadv_is_wifi_hardif(in_hardif))
 740                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 741         kref_init(&tt_local->common.refcount);
 742         tt_local->last_seen = jiffies;
 743         tt_local->common.added_at = tt_local->last_seen;
 744         tt_local->vlan = vlan;
 745
 746         /* the batman interface mac and multicast addresses should never be
 747          * purged
 748          */
 749         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
 750             is_multicast_ether_addr(addr))
 751                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 752
 753         kref_get(&tt_local->common.refcount);
 754         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 755                                      batadv_choose_tt, &tt_local->common,
 756                                      &tt_local->common.hash_entry);
 757
 758         if (unlikely(hash_added != 0)) {
 759                 /* remove the reference for the hash */
 760                 batadv_tt_local_entry_put(tt_local);
 761                 goto out;
 762         }
 763
 764 add_event:
 765         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 766
 767 check_roaming:
 768         /* Check whether it is a roaming, but don't do anything if the roaming
 769          * process has already been handled
 770          */
 771         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 772                 /* These node are probably going to update their tt table */
 773                 head = &tt_global->orig_list;
 774                 rcu_read_lock();
 775                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 776                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 777                                              tt_global->common.vid,
 778                                              orig_entry->orig_node);
 779                 }
 780                 rcu_read_unlock();
 781                 if (roamed_back) {
 782                         batadv_tt_global_free(bat_priv, tt_global,
 783                                               "Roaming canceled");
 784                         tt_global = NULL;
 785                 } else {
 786                         /* The global entry has to be marked as ROAMING and
 787                          * has to be kept for consistency purpose
 788                          */
 789                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 790                         tt_global->roam_at = jiffies;
 791                 }
 792         }
 793
 794         /* store the current remote flags before altering them. This helps
 795          * understanding is flags are changing or not
 796          */
 797         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 798
 799         if (batadv_is_wifi_hardif(in_hardif))
 800                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 801         else
 802                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 803
 804         /* check the mark in the skb: if it's equal to the configured
 805          * isolation_mark, it means the packet is coming from an isolated
 806          * non-mesh client
 807          */
 808         match_mark = (mark & bat_priv->isolation_mark_mask);
 809         if (bat_priv->isolation_mark_mask &&
 810             match_mark == bat_priv->isolation_mark)
 811                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 812         else
 813                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 814
 815         /* if any "dynamic" flag has been modified, resend an ADD event for this
 816          * entry so that all the nodes can get the new flags
 817          */
 818         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 819                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 820
 821         ret = true;
 822 out:
 823         if (in_hardif)
 824                 batadv_hardif_put(in_hardif);
 825         if (in_dev)
 826                 dev_put(in_dev);
 827         if (tt_local)
 828                 batadv_tt_local_entry_put(tt_local);
 829         if (tt_global)
 830                 batadv_tt_global_entry_put(tt_global);
 831         return ret;
 832 }
 833
 834 /**
 835  * batadv_tt_prepare_tvlv_global_data() - prepare the TVLV TT header to send
 836  *  within a TT Response directed to another node
 837  * @orig_node: originator for which the TT data has to be prepared
 838  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 839  * @tt_change: uninitialised pointer to the address of the area where the TT
 840  *  changed can be stored
 841  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 842  *  function reserves the amount of space needed to send the entire global TT
 843  *  table. In case of success the value is updated with the real amount of
 844  *  reserved bytes
 845  * Allocate the needed amount of memory for the entire TT TVLV and write its
 846  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 847  * objects, one per active VLAN served by the originator node.
 848  *
 849  * Return: the size of the allocated buffer or 0 in case of failure.
 850  */
 851 static u16
 852 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 853                                    struct batadv_tvlv_tt_data **tt_data,
 854                                    struct batadv_tvlv_tt_change **tt_change,
 855                                    s32 *tt_len)
 856 {
 857         u16 num_vlan = 0;
 858         u16 num_entries = 0;
 859         u16 change_offset;
 860         u16 tvlv_len;
 861         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 862         struct batadv_orig_node_vlan *vlan;
 863         u8 *tt_change_ptr;
 864
 865         spin_lock_bh(&orig_node->vlan_list_lock);
 866         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 867                 num_vlan++;
 868                 num_entries += atomic_read(&vlan->tt.num_entries);
 869         }
 870
 871         change_offset = sizeof(**tt_data);
 872         change_offset += num_vlan * sizeof(*tt_vlan);
 873
 874         /* if tt_len is negative, allocate the space needed by the full table */
 875         if (*tt_len < 0)
 876                 *tt_len = batadv_tt_len(num_entries);
 877
 878         tvlv_len = *tt_len;
 879         tvlv_len += change_offset;
 880
 881         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 882         if (!*tt_data) {
 883                 *tt_len = 0;
 884                 goto out;
 885         }
 886
 887         (*tt_data)->flags = BATADV_NO_FLAGS;
 888         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 889         (*tt_data)->num_vlan = htons(num_vlan);
 890
 891         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 892         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 893                 tt_vlan->vid = htons(vlan->vid);
 894                 tt_vlan->crc = htonl(vlan->tt.crc);
 895
 896                 tt_vlan++;
 897         }
 898
 899         tt_change_ptr = (u8 *)*tt_data + change_offset;
 900         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 901
 902 out:
 903         spin_unlock_bh(&orig_node->vlan_list_lock);
 904         return tvlv_len;
 905 }
 906
 907 /**
 908  * batadv_tt_prepare_tvlv_local_data() - allocate and prepare the TT TVLV for
 909  *  this node
 910  * @bat_priv: the bat priv with all the soft interface information
 911  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 912  * @tt_change: uninitialised pointer to the address of the area where the TT
 913  *  changes can be stored
 914  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 915  *  function reserves the amount of space needed to send the entire local TT
 916  *  table. In case of success the value is updated with the real amount of
 917  *  reserved bytes
 918  *
 919  * Allocate the needed amount of memory for the entire TT TVLV and write its
 920  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 921  * objects, one per active VLAN.
 922  *
 923  * Return: the size of the allocated buffer or 0 in case of failure.
 924  */
 925 static u16
 926 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 927                                   struct batadv_tvlv_tt_data **tt_data,
 928                                   struct batadv_tvlv_tt_change **tt_change,
 929                                   s32 *tt_len)
 930 {
 931         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 932         struct batadv_softif_vlan *vlan;
 933         u16 num_vlan = 0;
 934         u16 vlan_entries = 0;
 935         u16 total_entries = 0;
 936         u16 tvlv_len;
 937         u8 *tt_change_ptr;
 938         int change_offset;
 939
 940         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 941         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 942                 vlan_entries = atomic_read(&vlan->tt.num_entries);
 943                 if (vlan_entries < 1)
 944                         continue;
 945
 946                 num_vlan++;
 947                 total_entries += vlan_entries;
 948         }
 949
 950         change_offset = sizeof(**tt_data);
 951         change_offset += num_vlan * sizeof(*tt_vlan);
 952
 953         /* if tt_len is negative, allocate the space needed by the full table */
 954         if (*tt_len < 0)
 955                 *tt_len = batadv_tt_len(total_entries);
 956
 957         tvlv_len = *tt_len;
 958         tvlv_len += change_offset;
 959
 960         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 961         if (!*tt_data) {
 962                 tvlv_len = 0;
 963                 goto out;
 964         }
 965
 966         (*tt_data)->flags = BATADV_NO_FLAGS;
 967         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 968         (*tt_data)->num_vlan = htons(num_vlan);
 969
 970         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 971         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 972                 vlan_entries = atomic_read(&vlan->tt.num_entries);
 973                 if (vlan_entries < 1)
 974                         continue;
 975
 976                 tt_vlan->vid = htons(vlan->vid);
 977                 tt_vlan->crc = htonl(vlan->tt.crc);
 978
 979                 tt_vlan++;
 980         }
 981
 982         tt_change_ptr = (u8 *)*tt_data + change_offset;
 983         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 984
 985 out:
 986         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 987         return tvlv_len;
 988 }
 989
 990 /**
 991  * batadv_tt_tvlv_container_update() - update the translation table tvlv
 992  *  container after local tt changes have been committed
 993  * @bat_priv: the bat priv with all the soft interface information
 994  */
 995 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 996 {
 997         struct batadv_tt_change_node *entry, *safe;
 998         struct batadv_tvlv_tt_data *tt_data;
 999         struct batadv_tvlv_tt_change *tt_change;
1000         int tt_diff_len, tt_change_len = 0;
1001         int tt_diff_entries_num = 0;
1002         int tt_diff_entries_count = 0;
1003         u16 tvlv_len;
1004
1005         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
1006         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
1007
1008         /* if we have too many changes for one packet don't send any
1009          * and wait for the tt table request which will be fragmented
1010          */
1011         if (tt_diff_len > bat_priv->soft_iface->mtu)
1012                 tt_diff_len = 0;
1013
1014         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
1015                                                      &tt_change, &tt_diff_len);
1016         if (!tvlv_len)
1017                 return;
1018
1019         tt_data->flags = BATADV_TT_OGM_DIFF;
1020
1021         if (tt_diff_len == 0)
1022                 goto container_register;
1023
1024         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1025         atomic_set(&bat_priv->tt.local_changes, 0);
1026
1027         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1028                                  list) {
1029                 if (tt_diff_entries_count < tt_diff_entries_num) {
1030                         memcpy(tt_change + tt_diff_entries_count,
1031                                &entry->change,
1032                                sizeof(struct batadv_tvlv_tt_change));
1033                         tt_diff_entries_count++;
1034                 }
1035                 list_del(&entry->list);
1036                 kmem_cache_free(batadv_tt_change_cache, entry);
1037         }
1038         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1039
1040         /* Keep the buffer for possible tt_request */
1041         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1042         kfree(bat_priv->tt.last_changeset);
1043         bat_priv->tt.last_changeset_len = 0;
1044         bat_priv->tt.last_changeset = NULL;
1045         tt_change_len = batadv_tt_len(tt_diff_entries_count);
1046         /* check whether this new OGM has no changes due to size problems */
1047         if (tt_diff_entries_count > 0) {
1048                 /* if kmalloc() fails we will reply with the full table
1049                  * instead of providing the diff
1050                  */
1051                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
1052                 if (bat_priv->tt.last_changeset) {
1053                         memcpy(bat_priv->tt.last_changeset,
1054                                tt_change, tt_change_len);
1055                         bat_priv->tt.last_changeset_len = tt_diff_len;
1056                 }
1057         }
1058         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1059
1060 container_register:
1061         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
1062                                        tvlv_len);
1063         kfree(tt_data);
1064 }
1065
1066 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1067
1068 /**
1069  * batadv_tt_local_seq_print_text() - Print the local tt table in a seq file
1070  * @seq: seq file to print on
1071  * @offset: not used
1072  *
1073  * Return: always 0
1074  */
1075 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
1076 {
1077         struct net_device *net_dev = (struct net_device *)seq->private;
1078         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1079         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1080         struct batadv_tt_common_entry *tt_common_entry;
1081         struct batadv_tt_local_entry *tt_local;
1082         struct batadv_hard_iface *primary_if;
1083         struct hlist_head *head;
1084         u32 i;
1085         int last_seen_secs;
1086         int last_seen_msecs;
1087         unsigned long last_seen_jiffies;
1088         bool no_purge;
1089         u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
1090
1091         primary_if = batadv_seq_print_text_primary_if_get(seq);
1092         if (!primary_if)
1093                 goto out;
1094
1095         seq_printf(seq,
1096                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
1097                    net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
1098         seq_puts(seq,
1099                  "       Client         VID Flags    Last seen (CRC       )\n");
1100
1101         for (i = 0; i < hash->size; i++) {
1102                 head = &hash->table[i];
1103
1104                 rcu_read_lock();
1105                 hlist_for_each_entry_rcu(tt_common_entry,
1106                                          head, hash_entry) {
1107                         tt_local = container_of(tt_common_entry,
1108                                                 struct batadv_tt_local_entry,
1109                                                 common);
1110                         last_seen_jiffies = jiffies - tt_local->last_seen;
1111                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1112                         last_seen_secs = last_seen_msecs / 1000;
1113                         last_seen_msecs = last_seen_msecs % 1000;
1114
1115                         no_purge = tt_common_entry->flags & np_flag;
1116                         seq_printf(seq,
1117                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
1118                                    tt_common_entry->addr,
1119                                    batadv_print_vid(tt_common_entry->vid),
1120                                    ((tt_common_entry->flags &
1121                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1122                                    no_purge ? 'P' : '.',
1123                                    ((tt_common_entry->flags &
1124                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1125                                    ((tt_common_entry->flags &
1126                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1127                                    ((tt_common_entry->flags &
1128                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1129                                    ((tt_common_entry->flags &
1130                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1131                                    no_purge ? 0 : last_seen_secs,
1132                                    no_purge ? 0 : last_seen_msecs,
1133                                    tt_local->vlan->tt.crc);
1134                 }
1135                 rcu_read_unlock();
1136         }
1137 out:
1138         if (primary_if)
1139                 batadv_hardif_put(primary_if);
1140         return 0;
1141 }
1142 #endif
1143
1144 /**
1145  * batadv_tt_local_dump_entry() - Dump one TT local entry into a message
1146  * @msg :Netlink message to dump into
1147  * @portid: Port making netlink request
1148  * @seq: Sequence number of netlink message
1149  * @bat_priv: The bat priv with all the soft interface information
1150  * @common: tt local & tt global common data
1151  *
1152  * Return: Error code, or 0 on success
1153  */
1154 static int
1155 batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
1156                            struct batadv_priv *bat_priv,
1157                            struct batadv_tt_common_entry *common)
1158 {
1159         void *hdr;
1160         struct batadv_softif_vlan *vlan;
1161         struct batadv_tt_local_entry *local;
1162         unsigned int last_seen_msecs;
1163         u32 crc;
1164
1165         local = container_of(common, struct batadv_tt_local_entry, common);
1166         last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);
1167
1168         vlan = batadv_softif_vlan_get(bat_priv, common->vid);
1169         if (!vlan)
1170                 return 0;
1171
1172         crc = vlan->tt.crc;
1173
1174         batadv_softif_vlan_put(vlan);
1175
1176         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
1177                           NLM_F_MULTI,
1178                           BATADV_CMD_GET_TRANSTABLE_LOCAL);
1179         if (!hdr)
1180                 return -ENOBUFS;
1181
1182         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
1183             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
1184             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
1185             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
1186                 goto nla_put_failure;
1187
1188         if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
1189             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
1190                 goto nla_put_failure;
1191
1192         genlmsg_end(msg, hdr);
1193         return 0;
1194
1195  nla_put_failure:
1196         genlmsg_cancel(msg, hdr);
1197         return -EMSGSIZE;
1198 }
1199
1200 /**
1201  * batadv_tt_local_dump_bucket() - Dump one TT local bucket into a message
1202  * @msg: Netlink message to dump into
1203  * @portid: Port making netlink request
1204  * @seq: Sequence number of netlink message
1205  * @bat_priv: The bat priv with all the soft interface information
1206  * @head: Pointer to the list containing the local tt entries
1207  * @idx_s: Number of entries to skip
1208  *
1209  * Return: Error code, or 0 on success
1210  */
1211 static int
1212 batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
1213                             struct batadv_priv *bat_priv,
1214                             struct hlist_head *head, int *idx_s)
1215 {
1216         struct batadv_tt_common_entry *common;
1217         int idx = 0;
1218
1219         rcu_read_lock();
1220         hlist_for_each_entry_rcu(common, head, hash_entry) {
1221                 if (idx++ < *idx_s)
1222                         continue;
1223
1224                 if (batadv_tt_local_dump_entry(msg, portid, seq, bat_priv,
1225                                                common)) {
1226                         rcu_read_unlock();
1227                         *idx_s = idx - 1;
1228                         return -EMSGSIZE;
1229                 }
1230         }
1231         rcu_read_unlock();
1232
1233         *idx_s = 0;
1234         return 0;
1235 }
1236
1237 /**
1238  * batadv_tt_local_dump() - Dump TT local entries into a message
1239  * @msg: Netlink message to dump into
1240  * @cb: Parameters from query
1241  *
1242  * Return: Error code, or 0 on success
1243  */
1244 int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
1245 {
1246         struct net *net = sock_net(cb->skb->sk);
1247         struct net_device *soft_iface;
1248         struct batadv_priv *bat_priv;
1249         struct batadv_hard_iface *primary_if = NULL;
1250         struct batadv_hashtable *hash;
1251         struct hlist_head *head;
1252         int ret;
1253         int ifindex;
1254         int bucket = cb->args[0];
1255         int idx = cb->args[1];
1256         int portid = NETLINK_CB(cb->skb).portid;
1257
1258         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
1259         if (!ifindex)
1260                 return -EINVAL;
1261
1262         soft_iface = dev_get_by_index(net, ifindex);
1263         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
1264                 ret = -ENODEV;
1265                 goto out;
1266         }
1267
1268         bat_priv = netdev_priv(soft_iface);
1269
1270         primary_if = batadv_primary_if_get_selected(bat_priv);
1271         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
1272                 ret = -ENOENT;
1273                 goto out;
1274         }
1275
1276         hash = bat_priv->tt.local_hash;
1277
1278         while (bucket < hash->size) {
1279                 head = &hash->table[bucket];
1280
1281                 if (batadv_tt_local_dump_bucket(msg, portid, cb->nlh->nlmsg_seq,
1282                                                 bat_priv, head, &idx))
1283                         break;
1284
1285                 bucket++;
1286         }
1287
1288         ret = msg->len;
1289
1290  out:
1291         if (primary_if)
1292                 batadv_hardif_put(primary_if);
1293         if (soft_iface)
1294                 dev_put(soft_iface);
1295
1296         cb->args[0] = bucket;
1297         cb->args[1] = idx;
1298
1299         return ret;
1300 }
1301
1302 static void
1303 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1304                             struct batadv_tt_local_entry *tt_local_entry,
1305                             u16 flags, const char *message)
1306 {
1307         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1308
1309         /* The local client has to be marked as "pending to be removed" but has
1310          * to be kept in the table in order to send it in a full table
1311          * response issued before the net ttvn increment (consistency check)
1312          */
1313         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1314
1315         batadv_dbg(BATADV_DBG_TT, bat_priv,
1316                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1317                    tt_local_entry->common.addr,
1318                    batadv_print_vid(tt_local_entry->common.vid), message);
1319 }
1320
1321 /**
1322  * batadv_tt_local_remove() - logically remove an entry from the local table
1323  * @bat_priv: the bat priv with all the soft interface information
1324  * @addr: the MAC address of the client to remove
1325  * @vid: VLAN identifier
1326  * @message: message to append to the log on deletion
1327  * @roaming: true if the deletion is due to a roaming event
1328  *
1329  * Return: the flags assigned to the local entry before being deleted
1330  */
1331 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1332                            unsigned short vid, const char *message,
1333                            bool roaming)
1334 {
1335         struct batadv_tt_local_entry *tt_local_entry;
1336         u16 flags, curr_flags = BATADV_NO_FLAGS;
1337         void *tt_entry_exists;
1338
1339         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1340         if (!tt_local_entry)
1341                 goto out;
1342
1343         curr_flags = tt_local_entry->common.flags;
1344
1345         flags = BATADV_TT_CLIENT_DEL;
1346         /* if this global entry addition is due to a roaming, the node has to
1347          * mark the local entry as "roamed" in order to correctly reroute
1348          * packets later
1349          */
1350         if (roaming) {
1351                 flags |= BATADV_TT_CLIENT_ROAM;
1352                 /* mark the local client as ROAMed */
1353                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1354         }
1355
1356         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1357                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1358                                             message);
1359                 goto out;
1360         }
1361         /* if this client has been added right now, it is possible to
1362          * immediately purge it
1363          */
1364         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1365
1366         tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1367                                              batadv_compare_tt,
1368                                              batadv_choose_tt,
1369                                              &tt_local_entry->common);
1370         if (!tt_entry_exists)
1371                 goto out;
1372
1373         /* extra call to free the local tt entry */
1374         batadv_tt_local_entry_put(tt_local_entry);
1375
1376 out:
1377         if (tt_local_entry)
1378                 batadv_tt_local_entry_put(tt_local_entry);
1379
1380         return curr_flags;
1381 }
1382
1383 /**
1384  * batadv_tt_local_purge_list() - purge inactive tt local entries
1385  * @bat_priv: the bat priv with all the soft interface information
1386  * @head: pointer to the list containing the local tt entries
1387  * @timeout: parameter deciding whether a given tt local entry is considered
1388  *  inactive or not
1389  */
1390 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1391                                        struct hlist_head *head,
1392                                        int timeout)
1393 {
1394         struct batadv_tt_local_entry *tt_local_entry;
1395         struct batadv_tt_common_entry *tt_common_entry;
1396         struct hlist_node *node_tmp;
1397
1398         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1399                                   hash_entry) {
1400                 tt_local_entry = container_of(tt_common_entry,
1401                                               struct batadv_tt_local_entry,
1402                                               common);
1403                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1404                         continue;
1405
1406                 /* entry already marked for deletion */
1407                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1408                         continue;
1409
1410                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1411                         continue;
1412
1413                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1414                                             BATADV_TT_CLIENT_DEL, "timed out");
1415         }
1416 }
1417
1418 /**
1419  * batadv_tt_local_purge() - purge inactive tt local entries
1420  * @bat_priv: the bat priv with all the soft interface information
1421  * @timeout: parameter deciding whether a given tt local entry is considered
1422  *  inactive or not
1423  */
1424 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1425                                   int timeout)
1426 {
1427         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1428         struct hlist_head *head;
1429         spinlock_t *list_lock; /* protects write access to the hash lists */
1430         u32 i;
1431
1432         for (i = 0; i < hash->size; i++) {
1433                 head = &hash->table[i];
1434                 list_lock = &hash->list_locks[i];
1435
1436                 spin_lock_bh(list_lock);
1437                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1438                 spin_unlock_bh(list_lock);
1439         }
1440 }
1441
1442 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1443 {
1444         struct batadv_hashtable *hash;
1445         spinlock_t *list_lock; /* protects write access to the hash lists */
1446         struct batadv_tt_common_entry *tt_common_entry;
1447         struct batadv_tt_local_entry *tt_local;
1448         struct hlist_node *node_tmp;
1449         struct hlist_head *head;
1450         u32 i;
1451
1452         if (!bat_priv->tt.local_hash)
1453                 return;
1454
1455         hash = bat_priv->tt.local_hash;
1456
1457         for (i = 0; i < hash->size; i++) {
1458                 head = &hash->table[i];
1459                 list_lock = &hash->list_locks[i];
1460
1461                 spin_lock_bh(list_lock);
1462                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1463                                           head, hash_entry) {
1464                         hlist_del_rcu(&tt_common_entry->hash_entry);
1465                         tt_local = container_of(tt_common_entry,
1466                                                 struct batadv_tt_local_entry,
1467                                                 common);
1468
1469                         batadv_tt_local_entry_put(tt_local);
1470                 }
1471                 spin_unlock_bh(list_lock);
1472         }
1473
1474         batadv_hash_destroy(hash);
1475
1476         bat_priv->tt.local_hash = NULL;
1477 }
1478
1479 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1480 {
1481         if (bat_priv->tt.global_hash)
1482                 return 0;
1483
1484         bat_priv->tt.global_hash = batadv_hash_new(1024);
1485
1486         if (!bat_priv->tt.global_hash)
1487                 return -ENOMEM;
1488
1489         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1490                                    &batadv_tt_global_hash_lock_class_key);
1491
1492         return 0;
1493 }
1494
1495 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1496 {
1497         struct batadv_tt_change_node *entry, *safe;
1498
1499         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1500
1501         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1502                                  list) {
1503                 list_del(&entry->list);
1504                 kmem_cache_free(batadv_tt_change_cache, entry);
1505         }
1506
1507         atomic_set(&bat_priv->tt.local_changes, 0);
1508         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1509 }
1510
1511 /**
1512  * batadv_tt_global_orig_entry_find() - find a TT orig_list_entry
1513  * @entry: the TT global entry where the orig_list_entry has to be
1514  *  extracted from
1515  * @orig_node: the originator for which the orig_list_entry has to be found
1516  *
1517  * retrieve the orig_tt_list_entry belonging to orig_node from the
1518  * batadv_tt_global_entry list
1519  *
1520  * Return: it with an increased refcounter, NULL if not found
1521  */
1522 static struct batadv_tt_orig_list_entry *
1523 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1524                                  const struct batadv_orig_node *orig_node)
1525 {
1526         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1527         const struct hlist_head *head;
1528
1529         rcu_read_lock();
1530         head = &entry->orig_list;
1531         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1532                 if (tmp_orig_entry->orig_node != orig_node)
1533                         continue;
1534                 if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
1535                         continue;
1536
1537                 orig_entry = tmp_orig_entry;
1538                 break;
1539         }
1540         rcu_read_unlock();
1541
1542         return orig_entry;
1543 }
1544
1545 /**
1546  * batadv_tt_global_entry_has_orig() - check if a TT global entry is also
1547  *  handled by a given originator
1548  * @entry: the TT global entry to check
1549  * @orig_node: the originator to search in the list
1550  * @flags: a pointer to store TT flags for the given @entry received
1551  *  from @orig_node
1552  *
1553  * find out if an orig_node is already in the list of a tt_global_entry.
1554  *
1555  * Return: true if found, false otherwise
1556  */
1557 static bool
1558 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1559                                 const struct batadv_orig_node *orig_node,
1560                                 u8 *flags)
1561 {
1562         struct batadv_tt_orig_list_entry *orig_entry;
1563         bool found = false;
1564
1565         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1566         if (orig_entry) {
1567                 found = true;
1568
1569                 if (flags)
1570                         *flags = orig_entry->flags;
1571
1572                 batadv_tt_orig_list_entry_put(orig_entry);
1573         }
1574
1575         return found;
1576 }
1577
1578 /**
1579  * batadv_tt_global_sync_flags() - update TT sync flags
1580  * @tt_global: the TT global entry to update sync flags in
1581  *
1582  * Updates the sync flag bits in the tt_global flag attribute with a logical
1583  * OR of all sync flags from any of its TT orig entries.
1584  */
1585 static void
1586 batadv_tt_global_sync_flags(struct batadv_tt_global_entry *tt_global)
1587 {
1588         struct batadv_tt_orig_list_entry *orig_entry;
1589         const struct hlist_head *head;
1590         u16 flags = BATADV_NO_FLAGS;
1591
1592         rcu_read_lock();
1593         head = &tt_global->orig_list;
1594         hlist_for_each_entry_rcu(orig_entry, head, list)
1595                 flags |= orig_entry->flags;
1596         rcu_read_unlock();
1597
1598         flags |= tt_global->common.flags & (~BATADV_TT_SYNC_MASK);
1599         tt_global->common.flags = flags;
1600 }
1601
1602 /**
1603  * batadv_tt_global_orig_entry_add() - add or update a TT orig entry
1604  * @tt_global: the TT global entry to add an orig entry in
1605  * @orig_node: the originator to add an orig entry for
1606  * @ttvn: translation table version number of this changeset
1607  * @flags: TT sync flags
1608  */
1609 static void
1610 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1611                                 struct batadv_orig_node *orig_node, int ttvn,
1612                                 u8 flags)
1613 {
1614         struct batadv_tt_orig_list_entry *orig_entry;
1615
1616         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1617         if (orig_entry) {
1618                 /* refresh the ttvn: the current value could be a bogus one that
1619                  * was added during a "temporary client detection"
1620                  */
1621                 orig_entry->ttvn = ttvn;
1622                 orig_entry->flags = flags;
1623                 goto sync_flags;
1624         }
1625
1626         orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
1627         if (!orig_entry)
1628                 goto out;
1629
1630         INIT_HLIST_NODE(&orig_entry->list);
1631         kref_get(&orig_node->refcount);
1632         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1633         orig_entry->orig_node = orig_node;
1634         orig_entry->ttvn = ttvn;
1635         orig_entry->flags = flags;
1636         kref_init(&orig_entry->refcount);
1637
1638         spin_lock_bh(&tt_global->list_lock);
1639         kref_get(&orig_entry->refcount);
1640         hlist_add_head_rcu(&orig_entry->list,
1641                            &tt_global->orig_list);
1642         spin_unlock_bh(&tt_global->list_lock);
1643         atomic_inc(&tt_global->orig_list_count);
1644
1645 sync_flags:
1646         batadv_tt_global_sync_flags(tt_global);
1647 out:
1648         if (orig_entry)
1649                 batadv_tt_orig_list_entry_put(orig_entry);
1650 }
1651
1652 /**
1653  * batadv_tt_global_add() - add a new TT global entry or update an existing one
1654  * @bat_priv: the bat priv with all the soft interface information
1655  * @orig_node: the originator announcing the client
1656  * @tt_addr: the mac address of the non-mesh client
1657  * @vid: VLAN identifier
1658  * @flags: TT flags that have to be set for this non-mesh client
1659  * @ttvn: the tt version number ever announcing this non-mesh client
1660  *
1661  * Add a new TT global entry for the given originator. If the entry already
1662  * exists add a new reference to the given originator (a global entry can have
1663  * references to multiple originators) and adjust the flags attribute to reflect
1664  * the function argument.
1665  * If a TT local entry exists for this non-mesh client remove it.
1666  *
1667  * The caller must hold orig_node refcount.
1668  *
1669  * Return: true if the new entry has been added, false otherwise
1670  */
1671 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1672                                  struct batadv_orig_node *orig_node,
1673                                  const unsigned char *tt_addr,
1674                                  unsigned short vid, u16 flags, u8 ttvn)
1675 {
1676         struct batadv_tt_global_entry *tt_global_entry;
1677         struct batadv_tt_local_entry *tt_local_entry;
1678         bool ret = false;
1679         int hash_added;
1680         struct batadv_tt_common_entry *common;
1681         u16 local_flags;
1682
1683         /* ignore global entries from backbone nodes */
1684         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1685                 return true;
1686
1687         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1688         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1689
1690         /* if the node already has a local client for this entry, it has to wait
1691          * for a roaming advertisement instead of manually messing up the global
1692          * table
1693          */
1694         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1695             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1696                 goto out;
1697
1698         if (!tt_global_entry) {
1699                 tt_global_entry = kmem_cache_zalloc(batadv_tg_cache,
1700                                                     GFP_ATOMIC);
1701                 if (!tt_global_entry)
1702                         goto out;
1703
1704                 common = &tt_global_entry->common;
1705                 ether_addr_copy(common->addr, tt_addr);
1706                 common->vid = vid;
1707
1708                 common->flags = flags;
1709                 tt_global_entry->roam_at = 0;
1710                 /* node must store current time in case of roaming. This is
1711                  * needed to purge this entry out on timeout (if nobody claims
1712                  * it)
1713                  */
1714                 if (flags & BATADV_TT_CLIENT_ROAM)
1715                         tt_global_entry->roam_at = jiffies;
1716                 kref_init(&common->refcount);
1717                 common->added_at = jiffies;
1718
1719                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1720                 atomic_set(&tt_global_entry->orig_list_count, 0);
1721                 spin_lock_init(&tt_global_entry->list_lock);
1722
1723                 kref_get(&common->refcount);
1724                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1725                                              batadv_compare_tt,
1726                                              batadv_choose_tt, common,
1727                                              &common->hash_entry);
1728
1729                 if (unlikely(hash_added != 0)) {
1730                         /* remove the reference for the hash */
1731                         batadv_tt_global_entry_put(tt_global_entry);
1732                         goto out_remove;
1733                 }
1734         } else {
1735                 common = &tt_global_entry->common;
1736                 /* If there is already a global entry, we can use this one for
1737                  * our processing.
1738                  * But if we are trying to add a temporary client then here are
1739                  * two options at this point:
1740                  * 1) the global client is not a temporary client: the global
1741                  *    client has to be left as it is, temporary information
1742                  *    should never override any already known client state
1743                  * 2) the global client is a temporary client: purge the
1744                  *    originator list and add the new one orig_entry
1745                  */
1746                 if (flags & BATADV_TT_CLIENT_TEMP) {
1747                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1748                                 goto out;
1749                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1750                                                             orig_node, NULL))
1751                                 goto out_remove;
1752                         batadv_tt_global_del_orig_list(tt_global_entry);
1753                         goto add_orig_entry;
1754                 }
1755
1756                 /* if the client was temporary added before receiving the first
1757                  * OGM announcing it, we have to clear the TEMP flag. Also,
1758                  * remove the previous temporary orig node and re-add it
1759                  * if required. If the orig entry changed, the new one which
1760                  * is a non-temporary entry is preferred.
1761                  */
1762                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1763                         batadv_tt_global_del_orig_list(tt_global_entry);
1764                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1765                 }
1766
1767                 /* the change can carry possible "attribute" flags like the
1768                  * TT_CLIENT_TEMP, therefore they have to be copied in the
1769                  * client entry
1770                  */
1771                 common->flags |= flags & (~BATADV_TT_SYNC_MASK);
1772
1773                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1774                  * one originator left in the list and we previously received a
1775                  * delete + roaming change for this originator.
1776                  *
1777                  * We should first delete the old originator before adding the
1778                  * new one.
1779                  */
1780                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1781                         batadv_tt_global_del_orig_list(tt_global_entry);
1782                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1783                         tt_global_entry->roam_at = 0;
1784                 }
1785         }
1786 add_orig_entry:
1787         /* add the new orig_entry (if needed) or update it */
1788         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn,
1789                                         flags & BATADV_TT_SYNC_MASK);
1790
1791         batadv_dbg(BATADV_DBG_TT, bat_priv,
1792                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1793                    common->addr, batadv_print_vid(common->vid),
1794                    orig_node->orig);
1795         ret = true;
1796
1797 out_remove:
1798         /* Do not remove multicast addresses from the local hash on
1799          * global additions
1800          */
1801         if (is_multicast_ether_addr(tt_addr))
1802                 goto out;
1803
1804         /* remove address from local hash if present */
1805         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1806                                              "global tt received",
1807                                              flags & BATADV_TT_CLIENT_ROAM);
1808         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1809
1810         if (!(flags & BATADV_TT_CLIENT_ROAM))
1811                 /* this is a normal global add. Therefore the client is not in a
1812                  * roaming state anymore.
1813                  */
1814                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1815
1816 out:
1817         if (tt_global_entry)
1818                 batadv_tt_global_entry_put(tt_global_entry);
1819         if (tt_local_entry)
1820                 batadv_tt_local_entry_put(tt_local_entry);
1821         return ret;
1822 }
1823
1824 /**
1825  * batadv_transtable_best_orig() - Get best originator list entry from tt entry
1826  * @bat_priv: the bat priv with all the soft interface information
1827  * @tt_global_entry: global translation table entry to be analyzed
1828  *
1829  * This functon assumes the caller holds rcu_read_lock().
1830  * Return: best originator list entry or NULL on errors.
1831  */
1832 static struct batadv_tt_orig_list_entry *
1833 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1834                             struct batadv_tt_global_entry *tt_global_entry)
1835 {
1836         struct batadv_neigh_node *router, *best_router = NULL;
1837         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1838         struct hlist_head *head;
1839         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1840
1841         head = &tt_global_entry->orig_list;
1842         hlist_for_each_entry_rcu(orig_entry, head, list) {
1843                 router = batadv_orig_router_get(orig_entry->orig_node,
1844                                                 BATADV_IF_DEFAULT);
1845                 if (!router)
1846                         continue;
1847
1848                 if (best_router &&
1849                     bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
1850                                    BATADV_IF_DEFAULT) <= 0) {
1851                         batadv_neigh_node_put(router);
1852                         continue;
1853                 }
1854
1855                 /* release the refcount for the "old" best */
1856                 if (best_router)
1857                         batadv_neigh_node_put(best_router);
1858
1859                 best_entry = orig_entry;
1860                 best_router = router;
1861         }
1862
1863         if (best_router)
1864                 batadv_neigh_node_put(best_router);
1865
1866         return best_entry;
1867 }
1868
1869 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1870 /**
1871  * batadv_tt_global_print_entry() - print all orig nodes who announce the
1872  *  address for this global entry
1873  * @bat_priv: the bat priv with all the soft interface information
1874  * @tt_global_entry: global translation table entry to be printed
1875  * @seq: debugfs table seq_file struct
1876  *
1877  * This functon assumes the caller holds rcu_read_lock().
1878  */
1879 static void
1880 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1881                              struct batadv_tt_global_entry *tt_global_entry,
1882                              struct seq_file *seq)
1883 {
1884         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1885         struct batadv_tt_common_entry *tt_common_entry;
1886         struct batadv_orig_node_vlan *vlan;
1887         struct hlist_head *head;
1888         u8 last_ttvn;
1889         u16 flags;
1890
1891         tt_common_entry = &tt_global_entry->common;
1892         flags = tt_common_entry->flags;
1893
1894         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1895         if (best_entry) {
1896                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1897                                                  tt_common_entry->vid);
1898                 if (!vlan) {
1899                         seq_printf(seq,
1900                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1901                                    batadv_print_vid(tt_common_entry->vid),
1902                                    best_entry->orig_node->orig);
1903                         goto print_list;
1904                 }
1905
1906                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1907                 seq_printf(seq,
1908                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1909                            '*', tt_global_entry->common.addr,
1910                            batadv_print_vid(tt_global_entry->common.vid),
1911                            best_entry->ttvn, best_entry->orig_node->orig,
1912                            last_ttvn, vlan->tt.crc,
1913                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1914                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1915                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1916                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1917
1918                 batadv_orig_node_vlan_put(vlan);
1919         }
1920
1921 print_list:
1922         head = &tt_global_entry->orig_list;
1923
1924         hlist_for_each_entry_rcu(orig_entry, head, list) {
1925                 if (best_entry == orig_entry)
1926                         continue;
1927
1928                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1929                                                  tt_common_entry->vid);
1930                 if (!vlan) {
1931                         seq_printf(seq,
1932                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1933                                    batadv_print_vid(tt_common_entry->vid),
1934                                    orig_entry->orig_node->orig);
1935                         continue;
1936                 }
1937
1938                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1939                 seq_printf(seq,
1940                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1941                            '+', tt_global_entry->common.addr,
1942                            batadv_print_vid(tt_global_entry->common.vid),
1943                            orig_entry->ttvn, orig_entry->orig_node->orig,
1944                            last_ttvn, vlan->tt.crc,
1945                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1946                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1947                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1948                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1949
1950                 batadv_orig_node_vlan_put(vlan);
1951         }
1952 }
1953
1954 /**
1955  * batadv_tt_global_seq_print_text() - Print the global tt table in a seq file
1956  * @seq: seq file to print on
1957  * @offset: not used
1958  *
1959  * Return: always 0
1960  */
1961 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1962 {
1963         struct net_device *net_dev = (struct net_device *)seq->private;
1964         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1965         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1966         struct batadv_tt_common_entry *tt_common_entry;
1967         struct batadv_tt_global_entry *tt_global;
1968         struct batadv_hard_iface *primary_if;
1969         struct hlist_head *head;
1970         u32 i;
1971
1972         primary_if = batadv_seq_print_text_primary_if_get(seq);
1973         if (!primary_if)
1974                 goto out;
1975
1976         seq_printf(seq,
1977                    "Globally announced TT entries received via the mesh %s\n",
1978                    net_dev->name);
1979         seq_puts(seq,
1980                  "       Client         VID  (TTVN)       Originator      (Curr TTVN) (CRC       ) Flags\n");
1981
1982         for (i = 0; i < hash->size; i++) {
1983                 head = &hash->table[i];
1984
1985                 rcu_read_lock();
1986                 hlist_for_each_entry_rcu(tt_common_entry,
1987                                          head, hash_entry) {
1988                         tt_global = container_of(tt_common_entry,
1989                                                  struct batadv_tt_global_entry,
1990                                                  common);
1991                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1992                 }
1993                 rcu_read_unlock();
1994         }
1995 out:
1996         if (primary_if)
1997                 batadv_hardif_put(primary_if);
1998         return 0;
1999 }
2000 #endif
2001
2002 /**
2003  * batadv_tt_global_dump_subentry() - Dump all TT local entries into a message
2004  * @msg: Netlink message to dump into
2005  * @portid: Port making netlink request
2006  * @seq: Sequence number of netlink message
2007  * @common: tt local & tt global common data
2008  * @orig: Originator node announcing a non-mesh client
2009  * @best: Is the best originator for the TT entry
2010  *
2011  * Return: Error code, or 0 on success
2012  */
2013 static int
2014 batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
2015                                struct batadv_tt_common_entry *common,
2016                                struct batadv_tt_orig_list_entry *orig,
2017                                bool best)
2018 {
2019         u16 flags = (common->flags & (~BATADV_TT_SYNC_MASK)) | orig->flags;
2020         void *hdr;
2021         struct batadv_orig_node_vlan *vlan;
2022         u8 last_ttvn;
2023         u32 crc;
2024
2025         vlan = batadv_orig_node_vlan_get(orig->orig_node,
2026                                          common->vid);
2027         if (!vlan)
2028                 return 0;
2029
2030         crc = vlan->tt.crc;
2031
2032         batadv_orig_node_vlan_put(vlan);
2033
2034         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2035                           NLM_F_MULTI,
2036                           BATADV_CMD_GET_TRANSTABLE_GLOBAL);
2037         if (!hdr)
2038                 return -ENOBUFS;
2039
2040         last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
2041
2042         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
2043             nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2044                     orig->orig_node->orig) ||
2045             nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
2046             nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
2047             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
2048             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
2049             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, flags))
2050                 goto nla_put_failure;
2051
2052         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
2053                 goto nla_put_failure;
2054
2055         genlmsg_end(msg, hdr);
2056         return 0;
2057
2058  nla_put_failure:
2059         genlmsg_cancel(msg, hdr);
2060         return -EMSGSIZE;
2061 }
2062
2063 /**
2064  * batadv_tt_global_dump_entry() - Dump one TT global entry into a message
2065  * @msg: Netlink message to dump into
2066  * @portid: Port making netlink request
2067  * @seq: Sequence number of netlink message
2068  * @bat_priv: The bat priv with all the soft interface information
2069  * @common: tt local & tt global common data
2070  * @sub_s: Number of entries to skip
2071  *
2072  * This function assumes the caller holds rcu_read_lock().
2073  *
2074  * Return: Error code, or 0 on success
2075  */
2076 static int
2077 batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2078                             struct batadv_priv *bat_priv,
2079                             struct batadv_tt_common_entry *common, int *sub_s)
2080 {
2081         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
2082         struct batadv_tt_global_entry *global;
2083         struct hlist_head *head;
2084         int sub = 0;
2085         bool best;
2086
2087         global = container_of(common, struct batadv_tt_global_entry, common);
2088         best_entry = batadv_transtable_best_orig(bat_priv, global);
2089         head = &global->orig_list;
2090
2091         hlist_for_each_entry_rcu(orig_entry, head, list) {
2092                 if (sub++ < *sub_s)
2093                         continue;
2094
2095                 best = (orig_entry == best_entry);
2096
2097                 if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
2098                                                    orig_entry, best)) {
2099                         *sub_s = sub - 1;
2100                         return -EMSGSIZE;
2101                 }
2102         }
2103
2104         *sub_s = 0;
2105         return 0;
2106 }
2107
2108 /**
2109  * batadv_tt_global_dump_bucket() - Dump one TT local bucket into a message
2110  * @msg: Netlink message to dump into
2111  * @portid: Port making netlink request
2112  * @seq: Sequence number of netlink message
2113  * @bat_priv: The bat priv with all the soft interface information
2114  * @head: Pointer to the list containing the global tt entries
2115  * @idx_s: Number of entries to skip
2116  * @sub: Number of entries to skip
2117  *
2118  * Return: Error code, or 0 on success
2119  */
2120 static int
2121 batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2122                              struct batadv_priv *bat_priv,
2123                              struct hlist_head *head, int *idx_s, int *sub)
2124 {
2125         struct batadv_tt_common_entry *common;
2126         int idx = 0;
2127
2128         rcu_read_lock();
2129         hlist_for_each_entry_rcu(common, head, hash_entry) {
2130                 if (idx++ < *idx_s)
2131                         continue;
2132
2133                 if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
2134                                                 common, sub)) {
2135                         rcu_read_unlock();
2136                         *idx_s = idx - 1;
2137                         return -EMSGSIZE;
2138                 }
2139         }
2140         rcu_read_unlock();
2141
2142         *idx_s = 0;
2143         *sub = 0;
2144         return 0;
2145 }
2146
2147 /**
2148  * batadv_tt_global_dump() -  Dump TT global entries into a message
2149  * @msg: Netlink message to dump into
2150  * @cb: Parameters from query
2151  *
2152  * Return: Error code, or length of message on success
2153  */
2154 int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
2155 {
2156         struct net *net = sock_net(cb->skb->sk);
2157         struct net_device *soft_iface;
2158         struct batadv_priv *bat_priv;
2159         struct batadv_hard_iface *primary_if = NULL;
2160         struct batadv_hashtable *hash;
2161         struct hlist_head *head;
2162         int ret;
2163         int ifindex;
2164         int bucket = cb->args[0];
2165         int idx = cb->args[1];
2166         int sub = cb->args[2];
2167         int portid = NETLINK_CB(cb->skb).portid;
2168
2169         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
2170         if (!ifindex)
2171                 return -EINVAL;
2172
2173         soft_iface = dev_get_by_index(net, ifindex);
2174         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2175                 ret = -ENODEV;
2176                 goto out;
2177         }
2178
2179         bat_priv = netdev_priv(soft_iface);
2180
2181         primary_if = batadv_primary_if_get_selected(bat_priv);
2182         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2183                 ret = -ENOENT;
2184                 goto out;
2185         }
2186
2187         hash = bat_priv->tt.global_hash;
2188
2189         while (bucket < hash->size) {
2190                 head = &hash->table[bucket];
2191
2192                 if (batadv_tt_global_dump_bucket(msg, portid,
2193                                                  cb->nlh->nlmsg_seq, bat_priv,
2194                                                  head, &idx, &sub))
2195                         break;
2196
2197                 bucket++;
2198         }
2199
2200         ret = msg->len;
2201
2202  out:
2203         if (primary_if)
2204                 batadv_hardif_put(primary_if);
2205         if (soft_iface)
2206                 dev_put(soft_iface);
2207
2208         cb->args[0] = bucket;
2209         cb->args[1] = idx;
2210         cb->args[2] = sub;
2211
2212         return ret;
2213 }
2214
2215 /**
2216  * _batadv_tt_global_del_orig_entry() - remove and free an orig_entry
2217  * @tt_global_entry: the global entry to remove the orig_entry from
2218  * @orig_entry: the orig entry to remove and free
2219  *
2220  * Remove an orig_entry from its list in the given tt_global_entry and
2221  * free this orig_entry afterwards.
2222  *
2223  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
2224  * part of a list.
2225  */
2226 static void
2227 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
2228                                  struct batadv_tt_orig_list_entry *orig_entry)
2229 {
2230         lockdep_assert_held(&tt_global_entry->list_lock);
2231
2232         batadv_tt_global_size_dec(orig_entry->orig_node,
2233                                   tt_global_entry->common.vid);
2234         atomic_dec(&tt_global_entry->orig_list_count);
2235         /* requires holding tt_global_entry->list_lock and orig_entry->list
2236          * being part of a list
2237          */
2238         hlist_del_rcu(&orig_entry->list);
2239         batadv_tt_orig_list_entry_put(orig_entry);
2240 }
2241
2242 /* deletes the orig list of a tt_global_entry */
2243 static void
2244 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
2245 {
2246         struct hlist_head *head;
2247         struct hlist_node *safe;
2248         struct batadv_tt_orig_list_entry *orig_entry;
2249
2250         spin_lock_bh(&tt_global_entry->list_lock);
2251         head = &tt_global_entry->orig_list;
2252         hlist_for_each_entry_safe(orig_entry, safe, head, list)
2253                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
2254         spin_unlock_bh(&tt_global_entry->list_lock);
2255 }
2256
2257 /**
2258  * batadv_tt_global_del_orig_node() - remove orig_node from a global tt entry
2259  * @bat_priv: the bat priv with all the soft interface information
2260  * @tt_global_entry: the global entry to remove the orig_node from
2261  * @orig_node: the originator announcing the client
2262  * @message: message to append to the log on deletion
2263  *
2264  * Remove the given orig_node and its according orig_entry from the given
2265  * global tt entry.
2266  */
2267 static void
2268 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
2269                                struct batadv_tt_global_entry *tt_global_entry,
2270                                struct batadv_orig_node *orig_node,
2271                                const char *message)
2272 {
2273         struct hlist_head *head;
2274         struct hlist_node *safe;
2275         struct batadv_tt_orig_list_entry *orig_entry;
2276         unsigned short vid;
2277
2278         spin_lock_bh(&tt_global_entry->list_lock);
2279         head = &tt_global_entry->orig_list;
2280         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
2281                 if (orig_entry->orig_node == orig_node) {
2282                         vid = tt_global_entry->common.vid;
2283                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2284                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
2285                                    orig_node->orig,
2286                                    tt_global_entry->common.addr,
2287                                    batadv_print_vid(vid), message);
2288                         _batadv_tt_global_del_orig_entry(tt_global_entry,
2289                                                          orig_entry);
2290                 }
2291         }
2292         spin_unlock_bh(&tt_global_entry->list_lock);
2293 }
2294
2295 /* If the client is to be deleted, we check if it is the last origantor entry
2296  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
2297  * timer, otherwise we simply remove the originator scheduled for deletion.
2298  */
2299 static void
2300 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
2301                              struct batadv_tt_global_entry *tt_global_entry,
2302                              struct batadv_orig_node *orig_node,
2303                              const char *message)
2304 {
2305         bool last_entry = true;
2306         struct hlist_head *head;
2307         struct batadv_tt_orig_list_entry *orig_entry;
2308
2309         /* no local entry exists, case 1:
2310          * Check if this is the last one or if other entries exist.
2311          */
2312
2313         rcu_read_lock();
2314         head = &tt_global_entry->orig_list;
2315         hlist_for_each_entry_rcu(orig_entry, head, list) {
2316                 if (orig_entry->orig_node != orig_node) {
2317                         last_entry = false;
2318                         break;
2319                 }
2320         }
2321         rcu_read_unlock();
2322
2323         if (last_entry) {
2324                 /* its the last one, mark for roaming. */
2325                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
2326                 tt_global_entry->roam_at = jiffies;
2327         } else {
2328                 /* there is another entry, we can simply delete this
2329                  * one and can still use the other one.
2330                  */
2331                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2332                                                orig_node, message);
2333         }
2334 }
2335
2336 /**
2337  * batadv_tt_global_del() - remove a client from the global table
2338  * @bat_priv: the bat priv with all the soft interface information
2339  * @orig_node: an originator serving this client
2340  * @addr: the mac address of the client
2341  * @vid: VLAN identifier
2342  * @message: a message explaining the reason for deleting the client to print
2343  *  for debugging purpose
2344  * @roaming: true if the deletion has been triggered by a roaming event
2345  */
2346 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
2347                                  struct batadv_orig_node *orig_node,
2348                                  const unsigned char *addr, unsigned short vid,
2349                                  const char *message, bool roaming)
2350 {
2351         struct batadv_tt_global_entry *tt_global_entry;
2352         struct batadv_tt_local_entry *local_entry = NULL;
2353
2354         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2355         if (!tt_global_entry)
2356                 goto out;
2357
2358         if (!roaming) {
2359                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2360                                                orig_node, message);
2361
2362                 if (hlist_empty(&tt_global_entry->orig_list))
2363                         batadv_tt_global_free(bat_priv, tt_global_entry,
2364                                               message);
2365
2366                 goto out;
2367         }
2368
2369         /* if we are deleting a global entry due to a roam
2370          * event, there are two possibilities:
2371          * 1) the client roamed from node A to node B => if there
2372          *    is only one originator left for this client, we mark
2373          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
2374          *    wait for node B to claim it. In case of timeout
2375          *    the entry is purged.
2376          *
2377          *    If there are other originators left, we directly delete
2378          *    the originator.
2379          * 2) the client roamed to us => we can directly delete
2380          *    the global entry, since it is useless now.
2381          */
2382         local_entry = batadv_tt_local_hash_find(bat_priv,
2383                                                 tt_global_entry->common.addr,
2384                                                 vid);
2385         if (local_entry) {
2386                 /* local entry exists, case 2: client roamed to us. */
2387                 batadv_tt_global_del_orig_list(tt_global_entry);
2388                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
2389         } else {
2390                 /* no local entry exists, case 1: check for roaming */
2391                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
2392                                              orig_node, message);
2393         }
2394
2395 out:
2396         if (tt_global_entry)
2397                 batadv_tt_global_entry_put(tt_global_entry);
2398         if (local_entry)
2399                 batadv_tt_local_entry_put(local_entry);
2400 }
2401
2402 /**
2403  * batadv_tt_global_del_orig() - remove all the TT global entries belonging to
2404  *  the given originator matching the provided vid
2405  * @bat_priv: the bat priv with all the soft interface information
2406  * @orig_node: the originator owning the entries to remove
2407  * @match_vid: the VLAN identifier to match. If negative all the entries will be
2408  *  removed
2409  * @message: debug message to print as "reason"
2410  */
2411 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
2412                                struct batadv_orig_node *orig_node,
2413                                s32 match_vid,
2414                                const char *message)
2415 {
2416         struct batadv_tt_global_entry *tt_global;
2417         struct batadv_tt_common_entry *tt_common_entry;
2418         u32 i;
2419         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2420         struct hlist_node *safe;
2421         struct hlist_head *head;
2422         spinlock_t *list_lock; /* protects write access to the hash lists */
2423         unsigned short vid;
2424
2425         if (!hash)
2426                 return;
2427
2428         for (i = 0; i < hash->size; i++) {
2429                 head = &hash->table[i];
2430                 list_lock = &hash->list_locks[i];
2431
2432                 spin_lock_bh(list_lock);
2433                 hlist_for_each_entry_safe(tt_common_entry, safe,
2434                                           head, hash_entry) {
2435                         /* remove only matching entries */
2436                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
2437                                 continue;
2438
2439                         tt_global = container_of(tt_common_entry,
2440                                                  struct batadv_tt_global_entry,
2441                                                  common);
2442
2443                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
2444                                                        orig_node, message);
2445
2446                         if (hlist_empty(&tt_global->orig_list)) {
2447                                 vid = tt_global->common.vid;
2448                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
2449                                            "Deleting global tt entry %pM (vid: %d): %s\n",
2450                                            tt_global->common.addr,
2451                                            batadv_print_vid(vid), message);
2452                                 hlist_del_rcu(&tt_common_entry->hash_entry);
2453                                 batadv_tt_global_entry_put(tt_global);
2454                         }
2455                 }
2456                 spin_unlock_bh(list_lock);
2457         }
2458         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2459 }
2460
2461 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
2462                                       char **msg)
2463 {
2464         bool purge = false;
2465         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
2466         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
2467
2468         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
2469             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
2470                 purge = true;
2471                 *msg = "Roaming timeout\n";
2472         }
2473
2474         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
2475             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
2476                 purge = true;
2477                 *msg = "Temporary client timeout\n";
2478         }
2479
2480         return purge;
2481 }
2482
2483 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
2484 {
2485         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2486         struct hlist_head *head;
2487         struct hlist_node *node_tmp;
2488         spinlock_t *list_lock; /* protects write access to the hash lists */
2489         u32 i;
2490         char *msg = NULL;
2491         struct batadv_tt_common_entry *tt_common;
2492         struct batadv_tt_global_entry *tt_global;
2493
2494         for (i = 0; i < hash->size; i++) {
2495                 head = &hash->table[i];
2496                 list_lock = &hash->list_locks[i];
2497
2498                 spin_lock_bh(list_lock);
2499                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2500                                           hash_entry) {
2501                         tt_global = container_of(tt_common,
2502                                                  struct batadv_tt_global_entry,
2503                                                  common);
2504
2505                         if (!batadv_tt_global_to_purge(tt_global, &msg))
2506                                 continue;
2507
2508                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2509                                    "Deleting global tt entry %pM (vid: %d): %s\n",
2510                                    tt_global->common.addr,
2511                                    batadv_print_vid(tt_global->common.vid),
2512                                    msg);
2513
2514                         hlist_del_rcu(&tt_common->hash_entry);
2515
2516                         batadv_tt_global_entry_put(tt_global);
2517                 }
2518                 spin_unlock_bh(list_lock);
2519         }
2520 }
2521
2522 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2523 {
2524         struct batadv_hashtable *hash;
2525         spinlock_t *list_lock; /* protects write access to the hash lists */
2526         struct batadv_tt_common_entry *tt_common_entry;
2527         struct batadv_tt_global_entry *tt_global;
2528         struct hlist_node *node_tmp;
2529         struct hlist_head *head;
2530         u32 i;
2531
2532         if (!bat_priv->tt.global_hash)
2533                 return;
2534
2535         hash = bat_priv->tt.global_hash;
2536
2537         for (i = 0; i < hash->size; i++) {
2538                 head = &hash->table[i];
2539                 list_lock = &hash->list_locks[i];
2540
2541                 spin_lock_bh(list_lock);
2542                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2543                                           head, hash_entry) {
2544                         hlist_del_rcu(&tt_common_entry->hash_entry);
2545                         tt_global = container_of(tt_common_entry,
2546                                                  struct batadv_tt_global_entry,
2547                                                  common);
2548                         batadv_tt_global_entry_put(tt_global);
2549                 }
2550                 spin_unlock_bh(list_lock);
2551         }
2552
2553         batadv_hash_destroy(hash);
2554
2555         bat_priv->tt.global_hash = NULL;
2556 }
2557
2558 static bool
2559 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2560                        struct batadv_tt_global_entry *tt_global_entry)
2561 {
2562         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2563             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2564                 return true;
2565
2566         /* check if the two clients are marked as isolated */
2567         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2568             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2569                 return true;
2570
2571         return false;
2572 }
2573
2574 /**
2575  * batadv_transtable_search() - get the mesh destination for a given client
2576  * @bat_priv: the bat priv with all the soft interface information
2577  * @src: mac address of the source client
2578  * @addr: mac address of the destination client
2579  * @vid: VLAN identifier
2580  *
2581  * Return: a pointer to the originator that was selected as destination in the
2582  * mesh for contacting the client 'addr', NULL otherwise.
2583  * In case of multiple originators serving the same client, the function returns
2584  * the best one (best in terms of metric towards the destination node).
2585  *
2586  * If the two clients are AP isolated the function returns NULL.
2587  */
2588 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2589                                                   const u8 *src,
2590                                                   const u8 *addr,
2591                                                   unsigned short vid)
2592 {
2593         struct batadv_tt_local_entry *tt_local_entry = NULL;
2594         struct batadv_tt_global_entry *tt_global_entry = NULL;
2595         struct batadv_orig_node *orig_node = NULL;
2596         struct batadv_tt_orig_list_entry *best_entry;
2597
2598         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2599                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2600                 if (!tt_local_entry ||
2601                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2602                         goto out;
2603         }
2604
2605         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2606         if (!tt_global_entry)
2607                 goto out;
2608
2609         /* check whether the clients should not communicate due to AP
2610          * isolation
2611          */
2612         if (tt_local_entry &&
2613             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2614                 goto out;
2615
2616         rcu_read_lock();
2617         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2618         /* found anything? */
2619         if (best_entry)
2620                 orig_node = best_entry->orig_node;
2621         if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2622                 orig_node = NULL;
2623         rcu_read_unlock();
2624
2625 out:
2626         if (tt_global_entry)
2627                 batadv_tt_global_entry_put(tt_global_entry);
2628         if (tt_local_entry)
2629                 batadv_tt_local_entry_put(tt_local_entry);
2630
2631         return orig_node;
2632 }
2633
2634 /**
2635  * batadv_tt_global_crc() - calculates the checksum of the local table belonging
2636  *  to the given orig_node
2637  * @bat_priv: the bat priv with all the soft interface information
2638  * @orig_node: originator for which the CRC should be computed
2639  * @vid: VLAN identifier for which the CRC32 has to be computed
2640  *
2641  * This function computes the checksum for the global table corresponding to a
2642  * specific originator. In particular, the checksum is computed as follows: For
2643  * each client connected to the originator the CRC32C of the MAC address and the
2644  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2645  * together.
2646  *
2647  * The idea behind is that CRC32C should be used as much as possible in order to
2648  * produce a unique hash of the table, but since the order which is used to feed
2649  * the CRC32C function affects the result and since every node in the network
2650  * probably sorts the clients differently, the hash function cannot be directly
2651  * computed over the entire table. Hence the CRC32C is used only on
2652  * the single client entry, while all the results are then xor'ed together
2653  * because the XOR operation can combine them all while trying to reduce the
2654  * noise as much as possible.
2655  *
2656  * Return: the checksum of the global table of a given originator.
2657  */
2658 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2659                                 struct batadv_orig_node *orig_node,
2660                                 unsigned short vid)
2661 {
2662         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2663         struct batadv_tt_orig_list_entry *tt_orig;
2664         struct batadv_tt_common_entry *tt_common;
2665         struct batadv_tt_global_entry *tt_global;
2666         struct hlist_head *head;
2667         u32 i, crc_tmp, crc = 0;
2668         u8 flags;
2669         __be16 tmp_vid;
2670
2671         for (i = 0; i < hash->size; i++) {
2672                 head = &hash->table[i];
2673
2674                 rcu_read_lock();
2675                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2676                         tt_global = container_of(tt_common,
2677                                                  struct batadv_tt_global_entry,
2678                                                  common);
2679                         /* compute the CRC only for entries belonging to the
2680                          * VLAN identified by the vid passed as parameter
2681                          */
2682                         if (tt_common->vid != vid)
2683                                 continue;
2684
2685                         /* Roaming clients are in the global table for
2686                          * consistency only. They don't have to be
2687                          * taken into account while computing the
2688                          * global crc
2689                          */
2690                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2691                                 continue;
2692                         /* Temporary clients have not been announced yet, so
2693                          * they have to be skipped while computing the global
2694                          * crc
2695                          */
2696                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2697                                 continue;
2698
2699                         /* find out if this global entry is announced by this
2700                          * originator
2701                          */
2702                         tt_orig = batadv_tt_global_orig_entry_find(tt_global,
2703                                                                    orig_node);
2704                         if (!tt_orig)
2705                                 continue;
2706
2707                         /* use network order to read the VID: this ensures that
2708                          * every node reads the bytes in the same order.
2709                          */
2710                         tmp_vid = htons(tt_common->vid);
2711                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2712
2713                         /* compute the CRC on flags that have to be kept in sync
2714                          * among nodes
2715                          */
2716                         flags = tt_orig->flags;
2717                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2718
2719                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2720
2721                         batadv_tt_orig_list_entry_put(tt_orig);
2722                 }
2723                 rcu_read_unlock();
2724         }
2725
2726         return crc;
2727 }
2728
2729 /**
2730  * batadv_tt_local_crc() - calculates the checksum of the local table
2731  * @bat_priv: the bat priv with all the soft interface information
2732  * @vid: VLAN identifier for which the CRC32 has to be computed
2733  *
2734  * For details about the computation, please refer to the documentation for
2735  * batadv_tt_global_crc().
2736  *
2737  * Return: the checksum of the local table
2738  */
2739 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2740                                unsigned short vid)
2741 {
2742         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2743         struct batadv_tt_common_entry *tt_common;
2744         struct hlist_head *head;
2745         u32 i, crc_tmp, crc = 0;
2746         u8 flags;
2747         __be16 tmp_vid;
2748
2749         for (i = 0; i < hash->size; i++) {
2750                 head = &hash->table[i];
2751
2752                 rcu_read_lock();
2753                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2754                         /* compute the CRC only for entries belonging to the
2755                          * VLAN identified by vid
2756                          */
2757                         if (tt_common->vid != vid)
2758                                 continue;
2759
2760                         /* not yet committed clients have not to be taken into
2761                          * account while computing the CRC
2762                          */
2763                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2764                                 continue;
2765
2766                         /* use network order to read the VID: this ensures that
2767                          * every node reads the bytes in the same order.
2768                          */
2769                         tmp_vid = htons(tt_common->vid);
2770                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2771
2772                         /* compute the CRC on flags that have to be kept in sync
2773                          * among nodes
2774                          */
2775                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2776                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2777
2778                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2779                 }
2780                 rcu_read_unlock();
2781         }
2782
2783         return crc;
2784 }
2785
2786 /**
2787  * batadv_tt_req_node_release() - free tt_req node entry
2788  * @ref: kref pointer of the tt req_node entry
2789  */
2790 static void batadv_tt_req_node_release(struct kref *ref)
2791 {
2792         struct batadv_tt_req_node *tt_req_node;
2793
2794         tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2795
2796         kmem_cache_free(batadv_tt_req_cache, tt_req_node);
2797 }
2798
2799 /**
2800  * batadv_tt_req_node_put() - decrement the tt_req_node refcounter and
2801  *  possibly release it
2802  * @tt_req_node: tt_req_node to be free'd
2803  */
2804 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2805 {
2806         kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2807 }
2808
2809 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2810 {
2811         struct batadv_tt_req_node *node;
2812         struct hlist_node *safe;
2813
2814         spin_lock_bh(&bat_priv->tt.req_list_lock);
2815
2816         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2817                 hlist_del_init(&node->list);
2818                 batadv_tt_req_node_put(node);
2819         }
2820
2821         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2822 }
2823
2824 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2825                                        struct batadv_orig_node *orig_node,
2826                                        const void *tt_buff,
2827                                        u16 tt_buff_len)
2828 {
2829         /* Replace the old buffer only if I received something in the
2830          * last OGM (the OGM could carry no changes)
2831          */
2832         spin_lock_bh(&orig_node->tt_buff_lock);
2833         if (tt_buff_len > 0) {
2834                 kfree(orig_node->tt_buff);
2835                 orig_node->tt_buff_len = 0;
2836                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2837                 if (orig_node->tt_buff) {
2838                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2839                         orig_node->tt_buff_len = tt_buff_len;
2840                 }
2841         }
2842         spin_unlock_bh(&orig_node->tt_buff_lock);
2843 }
2844
2845 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2846 {
2847         struct batadv_tt_req_node *node;
2848         struct hlist_node *safe;
2849
2850         spin_lock_bh(&bat_priv->tt.req_list_lock);
2851         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2852                 if (batadv_has_timed_out(node->issued_at,
2853                                          BATADV_TT_REQUEST_TIMEOUT)) {
2854                         hlist_del_init(&node->list);
2855                         batadv_tt_req_node_put(node);
2856                 }
2857         }
2858         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2859 }
2860
2861 /**
2862  * batadv_tt_req_node_new() - search and possibly create a tt_req_node object
2863  * @bat_priv: the bat priv with all the soft interface information
2864  * @orig_node: orig node this request is being issued for
2865  *
2866  * Return: the pointer to the new tt_req_node struct if no request
2867  * has already been issued for this orig_node, NULL otherwise.
2868  */
2869 static struct batadv_tt_req_node *
2870 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2871                        struct batadv_orig_node *orig_node)
2872 {
2873         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2874
2875         spin_lock_bh(&bat_priv->tt.req_list_lock);
2876         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2877                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2878                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2879                                           BATADV_TT_REQUEST_TIMEOUT))
2880                         goto unlock;
2881         }
2882
2883         tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
2884         if (!tt_req_node)
2885                 goto unlock;
2886
2887         kref_init(&tt_req_node->refcount);
2888         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2889         tt_req_node->issued_at = jiffies;
2890
2891         kref_get(&tt_req_node->refcount);
2892         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2893 unlock:
2894         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2895         return tt_req_node;
2896 }
2897
2898 /**
2899  * batadv_tt_local_valid() - verify local tt entry and get flags
2900  * @entry_ptr: to be checked local tt entry
2901  * @data_ptr: not used but definition required to satisfy the callback prototype
2902  * @flags: a pointer to store TT flags for this client to
2903  *
2904  * Checks the validity of the given local TT entry. If it is, then the provided
2905  * flags pointer is updated.
2906  *
2907  * Return: true if the entry is a valid, false otherwise.
2908  */
2909 static bool batadv_tt_local_valid(const void *entry_ptr,
2910                                   const void *data_ptr,
2911                                   u8 *flags)
2912 {
2913         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2914
2915         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2916                 return false;
2917
2918         if (flags)
2919                 *flags = tt_common_entry->flags;
2920
2921         return true;
2922 }
2923
2924 /**
2925  * batadv_tt_global_valid() - verify global tt entry and get flags
2926  * @entry_ptr: to be checked global tt entry
2927  * @data_ptr: an orig_node object (may be NULL)
2928  * @flags: a pointer to store TT flags for this client to
2929  *
2930  * Checks the validity of the given global TT entry. If it is, then the provided
2931  * flags pointer is updated either with the common (summed) TT flags if data_ptr
2932  * is NULL or the specific, per originator TT flags otherwise.
2933  *
2934  * Return: true if the entry is a valid, false otherwise.
2935  */
2936 static bool batadv_tt_global_valid(const void *entry_ptr,
2937                                    const void *data_ptr,
2938                                    u8 *flags)
2939 {
2940         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2941         const struct batadv_tt_global_entry *tt_global_entry;
2942         const struct batadv_orig_node *orig_node = data_ptr;
2943
2944         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2945             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2946                 return false;
2947
2948         tt_global_entry = container_of(tt_common_entry,
2949                                        struct batadv_tt_global_entry,
2950                                        common);
2951
2952         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node,
2953                                                flags);
2954 }
2955
2956 /**
2957  * batadv_tt_tvlv_generate() - fill the tvlv buff with the tt entries from the
2958  *  specified tt hash
2959  * @bat_priv: the bat priv with all the soft interface information
2960  * @hash: hash table containing the tt entries
2961  * @tt_len: expected tvlv tt data buffer length in number of bytes
2962  * @tvlv_buff: pointer to the buffer to fill with the TT data
2963  * @valid_cb: function to filter tt change entries and to return TT flags
2964  * @cb_data: data passed to the filter function as argument
2965  *
2966  * Fills the tvlv buff with the tt entries from the specified hash. If valid_cb
2967  * is not provided then this becomes a no-op.
2968  */
2969 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2970                                     struct batadv_hashtable *hash,
2971                                     void *tvlv_buff, u16 tt_len,
2972                                     bool (*valid_cb)(const void *,
2973                                                      const void *,
2974                                                      u8 *flags),
2975                                     void *cb_data)
2976 {
2977         struct batadv_tt_common_entry *tt_common_entry;
2978         struct batadv_tvlv_tt_change *tt_change;
2979         struct hlist_head *head;
2980         u16 tt_tot, tt_num_entries = 0;
2981         u8 flags;
2982         bool ret;
2983         u32 i;
2984
2985         tt_tot = batadv_tt_entries(tt_len);
2986         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2987
2988         if (!valid_cb)
2989                 return;
2990
2991         rcu_read_lock();
2992         for (i = 0; i < hash->size; i++) {
2993                 head = &hash->table[i];
2994
2995                 hlist_for_each_entry_rcu(tt_common_entry,
2996                                          head, hash_entry) {
2997                         if (tt_tot == tt_num_entries)
2998                                 break;
2999
3000                         ret = valid_cb(tt_common_entry, cb_data, &flags);
3001                         if (!ret)
3002                                 continue;
3003
3004                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
3005                         tt_change->flags = flags;
3006                         tt_change->vid = htons(tt_common_entry->vid);
3007                         memset(tt_change->reserved, 0,
3008                                sizeof(tt_change->reserved));
3009
3010                         tt_num_entries++;
3011                         tt_change++;
3012                 }
3013         }
3014         rcu_read_unlock();
3015 }
3016
3017 /**
3018  * batadv_tt_global_check_crc() - check if all the CRCs are correct
3019  * @orig_node: originator for which the CRCs have to be checked
3020  * @tt_vlan: pointer to the first tvlv VLAN entry
3021  * @num_vlan: number of tvlv VLAN entries
3022  *
3023  * Return: true if all the received CRCs match the locally stored ones, false
3024  * otherwise
3025  */
3026 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
3027                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
3028                                        u16 num_vlan)
3029 {
3030         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
3031         struct batadv_orig_node_vlan *vlan;
3032         int i, orig_num_vlan;
3033         u32 crc;
3034
3035         /* check if each received CRC matches the locally stored one */
3036         for (i = 0; i < num_vlan; i++) {
3037                 tt_vlan_tmp = tt_vlan + i;
3038
3039                 /* if orig_node is a backbone node for this VLAN, don't check
3040                  * the CRC as we ignore all the global entries over it
3041                  */
3042                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
3043                                                    orig_node->orig,
3044                                                    ntohs(tt_vlan_tmp->vid)))
3045                         continue;
3046
3047                 vlan = batadv_orig_node_vlan_get(orig_node,
3048                                                  ntohs(tt_vlan_tmp->vid));
3049                 if (!vlan)
3050                         return false;
3051
3052                 crc = vlan->tt.crc;
3053                 batadv_orig_node_vlan_put(vlan);
3054
3055                 if (crc != ntohl(tt_vlan_tmp->crc))
3056                         return false;
3057         }
3058
3059         /* check if any excess VLANs exist locally for the originator
3060          * which are not mentioned in the TVLV from the originator.
3061          */
3062         rcu_read_lock();
3063         orig_num_vlan = 0;
3064         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
3065                 orig_num_vlan++;
3066         rcu_read_unlock();
3067
3068         if (orig_num_vlan > num_vlan)
3069                 return false;
3070
3071         return true;
3072 }
3073
3074 /**
3075  * batadv_tt_local_update_crc() - update all the local CRCs
3076  * @bat_priv: the bat priv with all the soft interface information
3077  */
3078 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
3079 {
3080         struct batadv_softif_vlan *vlan;
3081
3082         /* recompute the global CRC for each VLAN */
3083         rcu_read_lock();
3084         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
3085                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
3086         }
3087         rcu_read_unlock();
3088 }
3089
3090 /**
3091  * batadv_tt_global_update_crc() - update all the global CRCs for this orig_node
3092  * @bat_priv: the bat priv with all the soft interface information
3093  * @orig_node: the orig_node for which the CRCs have to be updated
3094  */
3095 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
3096                                         struct batadv_orig_node *orig_node)
3097 {
3098         struct batadv_orig_node_vlan *vlan;
3099         u32 crc;
3100
3101         /* recompute the global CRC for each VLAN */
3102         rcu_read_lock();
3103         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
3104                 /* if orig_node is a backbone node for this VLAN, don't compute
3105                  * the CRC as we ignore all the global entries over it
3106                  */
3107                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
3108                                                    vlan->vid))
3109                         continue;
3110
3111                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
3112                 vlan->tt.crc = crc;
3113         }
3114         rcu_read_unlock();
3115 }
3116
3117 /**
3118  * batadv_send_tt_request() - send a TT Request message to a given node
3119  * @bat_priv: the bat priv with all the soft interface information
3120  * @dst_orig_node: the destination of the message
3121  * @ttvn: the version number that the source of the message is looking for
3122  * @tt_vlan: pointer to the first tvlv VLAN object to request
3123  * @num_vlan: number of tvlv VLAN entries
3124  * @full_table: ask for the entire translation table if true, while only for the
3125  *  last TT diff otherwise
3126  *
3127  * Return: true if the TT Request was sent, false otherwise
3128  */
3129 static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
3130                                    struct batadv_orig_node *dst_orig_node,
3131                                    u8 ttvn,
3132                                    struct batadv_tvlv_tt_vlan_data *tt_vlan,
3133                                    u16 num_vlan, bool full_table)
3134 {
3135         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3136         struct batadv_tt_req_node *tt_req_node = NULL;
3137         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
3138         struct batadv_hard_iface *primary_if;
3139         bool ret = false;
3140         int i, size;
3141
3142         primary_if = batadv_primary_if_get_selected(bat_priv);
3143         if (!primary_if)
3144                 goto out;
3145
3146         /* The new tt_req will be issued only if I'm not waiting for a
3147          * reply from the same orig_node yet
3148          */
3149         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
3150         if (!tt_req_node)
3151                 goto out;
3152
3153         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
3154         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
3155         if (!tvlv_tt_data)
3156                 goto out;
3157
3158         tvlv_tt_data->flags = BATADV_TT_REQUEST;
3159         tvlv_tt_data->ttvn = ttvn;
3160         tvlv_tt_data->num_vlan = htons(num_vlan);
3161
3162         /* send all the CRCs within the request. This is needed by intermediate
3163          * nodes to ensure they have the correct table before replying
3164          */
3165         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
3166         for (i = 0; i < num_vlan; i++) {
3167                 tt_vlan_req->vid = tt_vlan->vid;
3168                 tt_vlan_req->crc = tt_vlan->crc;
3169
3170                 tt_vlan_req++;
3171                 tt_vlan++;
3172         }
3173
3174         if (full_table)
3175                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3176
3177         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
3178                    dst_orig_node->orig, full_table ? 'F' : '.');
3179
3180         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
3181         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3182                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
3183                                  tvlv_tt_data, size);
3184         ret = true;
3185
3186 out:
3187         if (primary_if)
3188                 batadv_hardif_put(primary_if);
3189
3190         if (ret && tt_req_node) {
3191                 spin_lock_bh(&bat_priv->tt.req_list_lock);
3192                 if (!hlist_unhashed(&tt_req_node->list)) {
3193                         hlist_del_init(&tt_req_node->list);
3194                         batadv_tt_req_node_put(tt_req_node);
3195                 }
3196                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3197         }
3198
3199         if (tt_req_node)
3200                 batadv_tt_req_node_put(tt_req_node);
3201
3202         kfree(tvlv_tt_data);
3203         return ret;
3204 }
3205
3206 /**
3207  * batadv_send_other_tt_response() - send reply to tt request concerning another
3208  *  node's translation table
3209  * @bat_priv: the bat priv with all the soft interface information
3210  * @tt_data: tt data containing the tt request information
3211  * @req_src: mac address of tt request sender
3212  * @req_dst: mac address of tt request recipient
3213  *
3214  * Return: true if tt request reply was sent, false otherwise.
3215  */
3216 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
3217                                           struct batadv_tvlv_tt_data *tt_data,
3218                                           u8 *req_src, u8 *req_dst)
3219 {
3220         struct batadv_orig_node *req_dst_orig_node;
3221         struct batadv_orig_node *res_dst_orig_node = NULL;
3222         struct batadv_tvlv_tt_change *tt_change;
3223         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3224         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3225         bool ret = false, full_table;
3226         u8 orig_ttvn, req_ttvn;
3227         u16 tvlv_len;
3228         s32 tt_len;
3229
3230         batadv_dbg(BATADV_DBG_TT, bat_priv,
3231                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
3232                    req_src, tt_data->ttvn, req_dst,
3233                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3234
3235         /* Let's get the orig node of the REAL destination */
3236         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
3237         if (!req_dst_orig_node)
3238                 goto out;
3239
3240         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
3241         if (!res_dst_orig_node)
3242                 goto out;
3243
3244         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
3245         req_ttvn = tt_data->ttvn;
3246
3247         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3248         /* this node doesn't have the requested data */
3249         if (orig_ttvn != req_ttvn ||
3250             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
3251                                         ntohs(tt_data->num_vlan)))
3252                 goto out;
3253
3254         /* If the full table has been explicitly requested */
3255         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
3256             !req_dst_orig_node->tt_buff)
3257                 full_table = true;
3258         else
3259                 full_table = false;
3260
3261         /* TT fragmentation hasn't been implemented yet, so send as many
3262          * TT entries fit a single packet as possible only
3263          */
3264         if (!full_table) {
3265                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
3266                 tt_len = req_dst_orig_node->tt_buff_len;
3267
3268                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3269                                                               &tvlv_tt_data,
3270                                                               &tt_change,
3271                                                               &tt_len);
3272                 if (!tt_len)
3273                         goto unlock;
3274
3275                 /* Copy the last orig_node's OGM buffer */
3276                 memcpy(tt_change, req_dst_orig_node->tt_buff,
3277                        req_dst_orig_node->tt_buff_len);
3278                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3279         } else {
3280                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3281                  * in the initial part
3282                  */
3283                 tt_len = -1;
3284                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3285                                                               &tvlv_tt_data,
3286                                                               &tt_change,
3287                                                               &tt_len);
3288                 if (!tt_len)
3289                         goto out;
3290
3291                 /* fill the rest of the tvlv with the real TT entries */
3292                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
3293                                         tt_change, tt_len,
3294                                         batadv_tt_global_valid,
3295                                         req_dst_orig_node);
3296         }
3297
3298         /* Don't send the response, if larger than fragmented packet. */
3299         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
3300         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
3301                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
3302                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
3303                                          res_dst_orig_node->orig);
3304                 goto out;
3305         }
3306
3307         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3308         tvlv_tt_data->ttvn = req_ttvn;
3309
3310         if (full_table)
3311                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3312
3313         batadv_dbg(BATADV_DBG_TT, bat_priv,
3314                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
3315                    res_dst_orig_node->orig, req_dst_orig_node->orig,
3316                    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, req_dst_orig_node->orig,
3321                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3322                                  tvlv_len);
3323
3324         ret = true;
3325         goto out;
3326
3327 unlock:
3328         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3329
3330 out:
3331         if (res_dst_orig_node)
3332                 batadv_orig_node_put(res_dst_orig_node);
3333         if (req_dst_orig_node)
3334                 batadv_orig_node_put(req_dst_orig_node);
3335         kfree(tvlv_tt_data);
3336         return ret;
3337 }
3338
3339 /**
3340  * batadv_send_my_tt_response() - send reply to tt request concerning this
3341  *  node's translation table
3342  * @bat_priv: the bat priv with all the soft interface information
3343  * @tt_data: tt data containing the tt request information
3344  * @req_src: mac address of tt request sender
3345  *
3346  * Return: true if tt request reply was sent, false otherwise.
3347  */
3348 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
3349                                        struct batadv_tvlv_tt_data *tt_data,
3350                                        u8 *req_src)
3351 {
3352         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3353         struct batadv_hard_iface *primary_if = NULL;
3354         struct batadv_tvlv_tt_change *tt_change;
3355         struct batadv_orig_node *orig_node;
3356         u8 my_ttvn, req_ttvn;
3357         u16 tvlv_len;
3358         bool full_table;
3359         s32 tt_len;
3360
3361         batadv_dbg(BATADV_DBG_TT, bat_priv,
3362                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
3363                    req_src, tt_data->ttvn,
3364                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3365
3366         spin_lock_bh(&bat_priv->tt.commit_lock);
3367
3368         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3369         req_ttvn = tt_data->ttvn;
3370
3371         orig_node = batadv_orig_hash_find(bat_priv, req_src);
3372         if (!orig_node)
3373                 goto out;
3374
3375         primary_if = batadv_primary_if_get_selected(bat_priv);
3376         if (!primary_if)
3377                 goto out;
3378
3379         /* If the full table has been explicitly requested or the gap
3380          * is too big send the whole local translation table
3381          */
3382         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
3383             !bat_priv->tt.last_changeset)
3384                 full_table = true;
3385         else
3386                 full_table = false;
3387
3388         /* TT fragmentation hasn't been implemented yet, so send as many
3389          * TT entries fit a single packet as possible only
3390          */
3391         if (!full_table) {
3392                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
3393
3394                 tt_len = bat_priv->tt.last_changeset_len;
3395                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3396                                                              &tvlv_tt_data,
3397                                                              &tt_change,
3398                                                              &tt_len);
3399                 if (!tt_len || !tvlv_len)
3400                         goto unlock;
3401
3402                 /* Copy the last orig_node's OGM buffer */
3403                 memcpy(tt_change, bat_priv->tt.last_changeset,
3404                        bat_priv->tt.last_changeset_len);
3405                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3406         } else {
3407                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3408
3409                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3410                  * in the initial part
3411                  */
3412                 tt_len = -1;
3413                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3414                                                              &tvlv_tt_data,
3415                                                              &tt_change,
3416                                                              &tt_len);
3417                 if (!tt_len || !tvlv_len)
3418                         goto out;
3419
3420                 /* fill the rest of the tvlv with the real TT entries */
3421                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
3422                                         tt_change, tt_len,
3423                                         batadv_tt_local_valid, NULL);
3424         }
3425
3426         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3427         tvlv_tt_data->ttvn = req_ttvn;
3428
3429         if (full_table)
3430                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3431
3432         batadv_dbg(BATADV_DBG_TT, bat_priv,
3433                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
3434                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
3435
3436         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3437
3438         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3439                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3440                                  tvlv_len);
3441
3442         goto out;
3443
3444 unlock:
3445         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3446 out:
3447         spin_unlock_bh(&bat_priv->tt.commit_lock);
3448         if (orig_node)
3449                 batadv_orig_node_put(orig_node);
3450         if (primary_if)
3451                 batadv_hardif_put(primary_if);
3452         kfree(tvlv_tt_data);
3453         /* The packet was for this host, so it doesn't need to be re-routed */
3454         return true;
3455 }
3456
3457 /**
3458  * batadv_send_tt_response() - send reply to tt request
3459  * @bat_priv: the bat priv with all the soft interface information
3460  * @tt_data: tt data containing the tt request information
3461  * @req_src: mac address of tt request sender
3462  * @req_dst: mac address of tt request recipient
3463  *
3464  * Return: true if tt request reply was sent, false otherwise.
3465  */
3466 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
3467                                     struct batadv_tvlv_tt_data *tt_data,
3468                                     u8 *req_src, u8 *req_dst)
3469 {
3470         if (batadv_is_my_mac(bat_priv, req_dst))
3471                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
3472         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
3473                                              req_dst);
3474 }
3475
3476 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
3477                                       struct batadv_orig_node *orig_node,
3478                                       struct batadv_tvlv_tt_change *tt_change,
3479                                       u16 tt_num_changes, u8 ttvn)
3480 {
3481         int i;
3482         int roams;
3483
3484         for (i = 0; i < tt_num_changes; i++) {
3485                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
3486                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
3487                         batadv_tt_global_del(bat_priv, orig_node,
3488                                              (tt_change + i)->addr,
3489                                              ntohs((tt_change + i)->vid),
3490                                              "tt removed by changes",
3491                                              roams);
3492                 } else {
3493                         if (!batadv_tt_global_add(bat_priv, orig_node,
3494                                                   (tt_change + i)->addr,
3495                                                   ntohs((tt_change + i)->vid),
3496                                                   (tt_change + i)->flags, ttvn))
3497                                 /* In case of problem while storing a
3498                                  * global_entry, we stop the updating
3499                                  * procedure without committing the
3500                                  * ttvn change. This will avoid to send
3501                                  * corrupted data on tt_request
3502                                  */
3503                                 return;
3504                 }
3505         }
3506         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
3507 }
3508
3509 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
3510                                   struct batadv_tvlv_tt_change *tt_change,
3511                                   u8 ttvn, u8 *resp_src,
3512                                   u16 num_entries)
3513 {
3514         struct batadv_orig_node *orig_node;
3515
3516         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3517         if (!orig_node)
3518                 goto out;
3519
3520         /* Purge the old table first.. */
3521         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
3522                                   "Received full table");
3523
3524         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
3525                                   ttvn);
3526
3527         spin_lock_bh(&orig_node->tt_buff_lock);
3528         kfree(orig_node->tt_buff);
3529         orig_node->tt_buff_len = 0;
3530         orig_node->tt_buff = NULL;
3531         spin_unlock_bh(&orig_node->tt_buff_lock);
3532
3533         atomic_set(&orig_node->last_ttvn, ttvn);
3534
3535 out:
3536         if (orig_node)
3537                 batadv_orig_node_put(orig_node);
3538 }
3539
3540 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
3541                                      struct batadv_orig_node *orig_node,
3542                                      u16 tt_num_changes, u8 ttvn,
3543                                      struct batadv_tvlv_tt_change *tt_change)
3544 {
3545         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
3546                                   tt_num_changes, ttvn);
3547
3548         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3549                                    batadv_tt_len(tt_num_changes));
3550         atomic_set(&orig_node->last_ttvn, ttvn);
3551 }
3552
3553 /**
3554  * batadv_is_my_client() - check if a client is served by the local node
3555  * @bat_priv: the bat priv with all the soft interface information
3556  * @addr: the mac address of the client to check
3557  * @vid: VLAN identifier
3558  *
3559  * Return: true if the client is served by this node, false otherwise.
3560  */
3561 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3562                          unsigned short vid)
3563 {
3564         struct batadv_tt_local_entry *tt_local_entry;
3565         bool ret = false;
3566
3567         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3568         if (!tt_local_entry)
3569                 goto out;
3570         /* Check if the client has been logically deleted (but is kept for
3571          * consistency purpose)
3572          */
3573         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3574             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3575                 goto out;
3576         ret = true;
3577 out:
3578         if (tt_local_entry)
3579                 batadv_tt_local_entry_put(tt_local_entry);
3580         return ret;
3581 }
3582
3583 /**
3584  * batadv_handle_tt_response() - process incoming tt reply
3585  * @bat_priv: the bat priv with all the soft interface information
3586  * @tt_data: tt data containing the tt request information
3587  * @resp_src: mac address of tt reply sender
3588  * @num_entries: number of tt change entries appended to the tt data
3589  */
3590 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3591                                       struct batadv_tvlv_tt_data *tt_data,
3592                                       u8 *resp_src, u16 num_entries)
3593 {
3594         struct batadv_tt_req_node *node;
3595         struct hlist_node *safe;
3596         struct batadv_orig_node *orig_node = NULL;
3597         struct batadv_tvlv_tt_change *tt_change;
3598         u8 *tvlv_ptr = (u8 *)tt_data;
3599         u16 change_offset;
3600
3601         batadv_dbg(BATADV_DBG_TT, bat_priv,
3602                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3603                    resp_src, tt_data->ttvn, num_entries,
3604                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3605
3606         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3607         if (!orig_node)
3608                 goto out;
3609
3610         spin_lock_bh(&orig_node->tt_lock);
3611
3612         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3613         change_offset *= ntohs(tt_data->num_vlan);
3614         change_offset += sizeof(*tt_data);
3615         tvlv_ptr += change_offset;
3616
3617         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3618         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3619                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3620                                       resp_src, num_entries);
3621         } else {
3622                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3623                                          tt_data->ttvn, tt_change);
3624         }
3625
3626         /* Recalculate the CRC for this orig_node and store it */
3627         batadv_tt_global_update_crc(bat_priv, orig_node);
3628
3629         spin_unlock_bh(&orig_node->tt_lock);
3630
3631         /* Delete the tt_req_node from pending tt_requests list */
3632         spin_lock_bh(&bat_priv->tt.req_list_lock);
3633         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3634                 if (!batadv_compare_eth(node->addr, resp_src))
3635                         continue;
3636                 hlist_del_init(&node->list);
3637                 batadv_tt_req_node_put(node);
3638         }
3639
3640         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3641 out:
3642         if (orig_node)
3643                 batadv_orig_node_put(orig_node);
3644 }
3645
3646 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3647 {
3648         struct batadv_tt_roam_node *node, *safe;
3649
3650         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3651
3652         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3653                 list_del(&node->list);
3654                 kmem_cache_free(batadv_tt_roam_cache, node);
3655         }
3656
3657         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3658 }
3659
3660 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3661 {
3662         struct batadv_tt_roam_node *node, *safe;
3663
3664         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3665         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3666                 if (!batadv_has_timed_out(node->first_time,
3667                                           BATADV_ROAMING_MAX_TIME))
3668                         continue;
3669
3670                 list_del(&node->list);
3671                 kmem_cache_free(batadv_tt_roam_cache, node);
3672         }
3673         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3674 }
3675
3676 /**
3677  * batadv_tt_check_roam_count() - check if a client has roamed too frequently
3678  * @bat_priv: the bat priv with all the soft interface information
3679  * @client: mac address of the roaming client
3680  *
3681  * This function checks whether the client already reached the
3682  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3683  * will not be sent.
3684  *
3685  * Return: true if the ROAMING_ADV can be sent, false otherwise
3686  */
3687 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3688 {
3689         struct batadv_tt_roam_node *tt_roam_node;
3690         bool ret = false;
3691
3692         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3693         /* The new tt_req will be issued only if I'm not waiting for a
3694          * reply from the same orig_node yet
3695          */
3696         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3697                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3698                         continue;
3699
3700                 if (batadv_has_timed_out(tt_roam_node->first_time,
3701                                          BATADV_ROAMING_MAX_TIME))
3702                         continue;
3703
3704                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3705                         /* Sorry, you roamed too many times! */
3706                         goto unlock;
3707                 ret = true;
3708                 break;
3709         }
3710
3711         if (!ret) {
3712                 tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
3713                                                 GFP_ATOMIC);
3714                 if (!tt_roam_node)
3715                         goto unlock;
3716
3717                 tt_roam_node->first_time = jiffies;
3718                 atomic_set(&tt_roam_node->counter,
3719                            BATADV_ROAMING_MAX_COUNT - 1);
3720                 ether_addr_copy(tt_roam_node->addr, client);
3721
3722                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3723                 ret = true;
3724         }
3725
3726 unlock:
3727         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3728         return ret;
3729 }
3730
3731 /**
3732  * batadv_send_roam_adv() - send a roaming advertisement message
3733  * @bat_priv: the bat priv with all the soft interface information
3734  * @client: mac address of the roaming client
3735  * @vid: VLAN identifier
3736  * @orig_node: message destination
3737  *
3738  * Send a ROAMING_ADV message to the node which was previously serving this
3739  * client. This is done to inform the node that from now on all traffic destined
3740  * for this particular roamed client has to be forwarded to the sender of the
3741  * roaming message.
3742  */
3743 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3744                                  unsigned short vid,
3745                                  struct batadv_orig_node *orig_node)
3746 {
3747         struct batadv_hard_iface *primary_if;
3748         struct batadv_tvlv_roam_adv tvlv_roam;
3749
3750         primary_if = batadv_primary_if_get_selected(bat_priv);
3751         if (!primary_if)
3752                 goto out;
3753
3754         /* before going on we have to check whether the client has
3755          * already roamed to us too many times
3756          */
3757         if (!batadv_tt_check_roam_count(bat_priv, client))
3758                 goto out;
3759
3760         batadv_dbg(BATADV_DBG_TT, bat_priv,
3761                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3762                    orig_node->orig, client, batadv_print_vid(vid));
3763
3764         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3765
3766         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3767         tvlv_roam.vid = htons(vid);
3768
3769         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3770                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3771                                  &tvlv_roam, sizeof(tvlv_roam));
3772
3773 out:
3774         if (primary_if)
3775                 batadv_hardif_put(primary_if);
3776 }
3777
3778 static void batadv_tt_purge(struct work_struct *work)
3779 {
3780         struct delayed_work *delayed_work;
3781         struct batadv_priv_tt *priv_tt;
3782         struct batadv_priv *bat_priv;
3783
3784         delayed_work = to_delayed_work(work);
3785         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3786         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3787
3788         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3789         batadv_tt_global_purge(bat_priv);
3790         batadv_tt_req_purge(bat_priv);
3791         batadv_tt_roam_purge(bat_priv);
3792
3793         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3794                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3795 }
3796
3797 /**
3798  * batadv_tt_free() - Free translation table of soft interface
3799  * @bat_priv: the bat priv with all the soft interface information
3800  */
3801 void batadv_tt_free(struct batadv_priv *bat_priv)
3802 {
3803         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3804         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3805
3806         cancel_delayed_work_sync(&bat_priv->tt.work);
3807
3808         batadv_tt_local_table_free(bat_priv);
3809         batadv_tt_global_table_free(bat_priv);
3810         batadv_tt_req_list_free(bat_priv);
3811         batadv_tt_changes_list_free(bat_priv);
3812         batadv_tt_roam_list_free(bat_priv);
3813
3814         kfree(bat_priv->tt.last_changeset);
3815 }
3816
3817 /**
3818  * batadv_tt_local_set_flags() - set or unset the specified flags on the local
3819  *  table and possibly count them in the TT size
3820  * @bat_priv: the bat priv with all the soft interface information
3821  * @flags: the flag to switch
3822  * @enable: whether to set or unset the flag
3823  * @count: whether to increase the TT size by the number of changed entries
3824  */
3825 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3826                                       bool enable, bool count)
3827 {
3828         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3829         struct batadv_tt_common_entry *tt_common_entry;
3830         struct hlist_head *head;
3831         u32 i;
3832
3833         if (!hash)
3834                 return;
3835
3836         for (i = 0; i < hash->size; i++) {
3837                 head = &hash->table[i];
3838
3839                 rcu_read_lock();
3840                 hlist_for_each_entry_rcu(tt_common_entry,
3841                                          head, hash_entry) {
3842                         if (enable) {
3843                                 if ((tt_common_entry->flags & flags) == flags)
3844                                         continue;
3845                                 tt_common_entry->flags |= flags;
3846                         } else {
3847                                 if (!(tt_common_entry->flags & flags))
3848                                         continue;
3849                                 tt_common_entry->flags &= ~flags;
3850                         }
3851
3852                         if (!count)
3853                                 continue;
3854
3855                         batadv_tt_local_size_inc(bat_priv,
3856                                                  tt_common_entry->vid);
3857                 }
3858                 rcu_read_unlock();
3859         }
3860 }
3861
3862 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3863 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3864 {
3865         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3866         struct batadv_tt_common_entry *tt_common;
3867         struct batadv_tt_local_entry *tt_local;
3868         struct hlist_node *node_tmp;
3869         struct hlist_head *head;
3870         spinlock_t *list_lock; /* protects write access to the hash lists */
3871         u32 i;
3872
3873         if (!hash)
3874                 return;
3875
3876         for (i = 0; i < hash->size; i++) {
3877                 head = &hash->table[i];
3878                 list_lock = &hash->list_locks[i];
3879
3880                 spin_lock_bh(list_lock);
3881                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3882                                           hash_entry) {
3883                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3884                                 continue;
3885
3886                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3887                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3888                                    tt_common->addr,
3889                                    batadv_print_vid(tt_common->vid));
3890
3891                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3892                         hlist_del_rcu(&tt_common->hash_entry);
3893                         tt_local = container_of(tt_common,
3894                                                 struct batadv_tt_local_entry,
3895                                                 common);
3896
3897                         batadv_tt_local_entry_put(tt_local);
3898                 }
3899                 spin_unlock_bh(list_lock);
3900         }
3901 }
3902
3903 /**
3904  * batadv_tt_local_commit_changes_nolock() - commit all pending local tt changes
3905  *  which have been queued in the time since the last commit
3906  * @bat_priv: the bat priv with all the soft interface information
3907  *
3908  * Caller must hold tt->commit_lock.
3909  */
3910 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3911 {
3912         lockdep_assert_held(&bat_priv->tt.commit_lock);
3913
3914         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3915                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3916                         batadv_tt_tvlv_container_update(bat_priv);
3917                 return;
3918         }
3919
3920         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3921
3922         batadv_tt_local_purge_pending_clients(bat_priv);
3923         batadv_tt_local_update_crc(bat_priv);
3924
3925         /* Increment the TTVN only once per OGM interval */
3926         atomic_inc(&bat_priv->tt.vn);
3927         batadv_dbg(BATADV_DBG_TT, bat_priv,
3928                    "Local changes committed, updating to ttvn %u\n",
3929                    (u8)atomic_read(&bat_priv->tt.vn));
3930
3931         /* reset the sending counter */
3932         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3933         batadv_tt_tvlv_container_update(bat_priv);
3934 }
3935
3936 /**
3937  * batadv_tt_local_commit_changes() - commit all pending local tt changes which
3938  *  have been queued in the time since the last commit
3939  * @bat_priv: the bat priv with all the soft interface information
3940  */
3941 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3942 {
3943         spin_lock_bh(&bat_priv->tt.commit_lock);
3944         batadv_tt_local_commit_changes_nolock(bat_priv);
3945         spin_unlock_bh(&bat_priv->tt.commit_lock);
3946 }
3947
3948 /**
3949  * batadv_is_ap_isolated() - Check if packet from upper layer should be dropped
3950  * @bat_priv: the bat priv with all the soft interface information
3951  * @src: source mac address of packet
3952  * @dst: destination mac address of packet
3953  * @vid: vlan id of packet
3954  *
3955  * Return: true when src+dst(+vid) pair should be isolated, false otherwise
3956  */
3957 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3958                            unsigned short vid)
3959 {
3960         struct batadv_tt_local_entry *tt_local_entry;
3961         struct batadv_tt_global_entry *tt_global_entry;
3962         struct batadv_softif_vlan *vlan;
3963         bool ret = false;
3964
3965         vlan = batadv_softif_vlan_get(bat_priv, vid);
3966         if (!vlan)
3967                 return false;
3968
3969         if (!atomic_read(&vlan->ap_isolation))
3970                 goto vlan_put;
3971
3972         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3973         if (!tt_local_entry)
3974                 goto vlan_put;
3975
3976         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3977         if (!tt_global_entry)
3978                 goto local_entry_put;
3979
3980         if (_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3981                 ret = true;
3982
3983         batadv_tt_global_entry_put(tt_global_entry);
3984 local_entry_put:
3985         batadv_tt_local_entry_put(tt_local_entry);
3986 vlan_put:
3987         batadv_softif_vlan_put(vlan);
3988         return ret;
3989 }
3990
3991 /**
3992  * batadv_tt_update_orig() - update global translation table with new tt
3993  *  information received via ogms
3994  * @bat_priv: the bat priv with all the soft interface information
3995  * @orig_node: the orig_node of the ogm
3996  * @tt_buff: pointer to the first tvlv VLAN entry
3997  * @tt_num_vlan: number of tvlv VLAN entries
3998  * @tt_change: pointer to the first entry in the TT buffer
3999  * @tt_num_changes: number of tt changes inside the tt buffer
4000  * @ttvn: translation table version number of this changeset
4001  */
4002 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
4003                                   struct batadv_orig_node *orig_node,
4004                                   const void *tt_buff, u16 tt_num_vlan,
4005                                   struct batadv_tvlv_tt_change *tt_change,
4006                                   u16 tt_num_changes, u8 ttvn)
4007 {
4008         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
4009         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4010         bool full_table = true;
4011         bool has_tt_init;
4012
4013         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
4014         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
4015                                &orig_node->capa_initialized);
4016
4017         /* orig table not initialised AND first diff is in the OGM OR the ttvn
4018          * increased by one -> we can apply the attached changes
4019          */
4020         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
4021                 /* the OGM could not contain the changes due to their size or
4022                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
4023                  * times.
4024                  * In this case send a tt request
4025                  */
4026                 if (!tt_num_changes) {
4027                         full_table = false;
4028                         goto request_table;
4029                 }
4030
4031                 spin_lock_bh(&orig_node->tt_lock);
4032
4033                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
4034                                          ttvn, tt_change);
4035
4036                 /* Even if we received the precomputed crc with the OGM, we
4037                  * prefer to recompute it to spot any possible inconsistency
4038                  * in the global table
4039                  */
4040                 batadv_tt_global_update_crc(bat_priv, orig_node);
4041
4042                 spin_unlock_bh(&orig_node->tt_lock);
4043
4044                 /* The ttvn alone is not enough to guarantee consistency
4045                  * because a single value could represent different states
4046                  * (due to the wrap around). Thus a node has to check whether
4047                  * the resulting table (after applying the changes) is still
4048                  * consistent or not. E.g. a node could disconnect while its
4049                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
4050                  * checking the CRC value is mandatory to detect the
4051                  * inconsistency
4052                  */
4053                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
4054                                                 tt_num_vlan))
4055                         goto request_table;
4056         } else {
4057                 /* if we missed more than one change or our tables are not
4058                  * in sync anymore -> request fresh tt data
4059                  */
4060                 if (!has_tt_init || ttvn != orig_ttvn ||
4061                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
4062                                                 tt_num_vlan)) {
4063 request_table:
4064                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4065                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
4066                                    orig_node->orig, ttvn, orig_ttvn,
4067                                    tt_num_changes);
4068                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
4069                                                tt_vlan, tt_num_vlan,
4070                                                full_table);
4071                         return;
4072                 }
4073         }
4074 }
4075
4076 /**
4077  * batadv_tt_global_client_is_roaming() - check if a client is marked as roaming
4078  * @bat_priv: the bat priv with all the soft interface information
4079  * @addr: the mac address of the client to check
4080  * @vid: VLAN identifier
4081  *
4082  * Return: true if we know that the client has moved from its old originator
4083  * to another one. This entry is still kept for consistency purposes and will be
4084  * deleted later by a DEL or because of timeout
4085  */
4086 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
4087                                         u8 *addr, unsigned short vid)
4088 {
4089         struct batadv_tt_global_entry *tt_global_entry;
4090         bool ret = false;
4091
4092         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
4093         if (!tt_global_entry)
4094                 goto out;
4095
4096         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4097         batadv_tt_global_entry_put(tt_global_entry);
4098 out:
4099         return ret;
4100 }
4101
4102 /**
4103  * batadv_tt_local_client_is_roaming() - tells whether the client is roaming
4104  * @bat_priv: the bat priv with all the soft interface information
4105  * @addr: the mac address of the local client to query
4106  * @vid: VLAN identifier
4107  *
4108  * Return: true if the local client is known to be roaming (it is not served by
4109  * this node anymore) or not. If yes, the client is still present in the table
4110  * to keep the latter consistent with the node TTVN
4111  */
4112 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
4113                                        u8 *addr, unsigned short vid)
4114 {
4115         struct batadv_tt_local_entry *tt_local_entry;
4116         bool ret = false;
4117
4118         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
4119         if (!tt_local_entry)
4120                 goto out;
4121
4122         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4123         batadv_tt_local_entry_put(tt_local_entry);
4124 out:
4125         return ret;
4126 }
4127
4128 /**
4129  * batadv_tt_add_temporary_global_entry() - Add temporary entry to global TT
4130  * @bat_priv: the bat priv with all the soft interface information
4131  * @orig_node: orig node which the temporary entry should be associated with
4132  * @addr: mac address of the client
4133  * @vid: VLAN id of the new temporary global translation table
4134  *
4135  * Return: true when temporary tt entry could be added, false otherwise
4136  */
4137 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
4138                                           struct batadv_orig_node *orig_node,
4139                                           const unsigned char *addr,
4140                                           unsigned short vid)
4141 {
4142         /* ignore loop detect macs, they are not supposed to be in the tt local
4143          * data as well.
4144          */
4145         if (batadv_bla_is_loopdetect_mac(addr))
4146                 return false;
4147
4148         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
4149                                   BATADV_TT_CLIENT_TEMP,
4150                                   atomic_read(&orig_node->last_ttvn)))
4151                 return false;
4152
4153         batadv_dbg(BATADV_DBG_TT, bat_priv,
4154                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
4155                    addr, batadv_print_vid(vid), orig_node->orig);
4156
4157         return true;
4158 }
4159
4160 /**
4161  * batadv_tt_local_resize_to_mtu() - resize the local translation table fit the
4162  *  maximum packet size that can be transported through the mesh
4163  * @soft_iface: netdev struct of the mesh interface
4164  *
4165  * Remove entries older than 'timeout' and half timeout if more entries need
4166  * to be removed.
4167  */
4168 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
4169 {
4170         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
4171         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
4172         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
4173         bool reduced = false;
4174
4175         spin_lock_bh(&bat_priv->tt.commit_lock);
4176
4177         while (true) {
4178                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
4179                 if (packet_size_max >= table_size)
4180                         break;
4181
4182                 batadv_tt_local_purge(bat_priv, timeout);
4183                 batadv_tt_local_purge_pending_clients(bat_priv);
4184
4185                 timeout /= 2;
4186                 reduced = true;
4187                 net_ratelimited_function(batadv_info, soft_iface,
4188                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
4189                                          packet_size_max);
4190         }
4191
4192         /* commit these changes immediately, to avoid synchronization problem
4193          * with the TTVN
4194          */
4195         if (reduced)
4196                 batadv_tt_local_commit_changes_nolock(bat_priv);
4197
4198         spin_unlock_bh(&bat_priv->tt.commit_lock);
4199 }
4200
4201 /**
4202  * batadv_tt_tvlv_ogm_handler_v1() - process incoming tt tvlv container
4203  * @bat_priv: the bat priv with all the soft interface information
4204  * @orig: the orig_node of the ogm
4205  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
4206  * @tvlv_value: tvlv buffer containing the gateway data
4207  * @tvlv_value_len: tvlv buffer length
4208  */
4209 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
4210                                           struct batadv_orig_node *orig,
4211                                           u8 flags, void *tvlv_value,
4212                                           u16 tvlv_value_len)
4213 {
4214         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4215         struct batadv_tvlv_tt_change *tt_change;
4216         struct batadv_tvlv_tt_data *tt_data;
4217         u16 num_entries, num_vlan;
4218
4219         if (tvlv_value_len < sizeof(*tt_data))
4220                 return;
4221
4222         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4223         tvlv_value_len -= sizeof(*tt_data);
4224
4225         num_vlan = ntohs(tt_data->num_vlan);
4226
4227         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
4228                 return;
4229
4230         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
4231         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
4232         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
4233
4234         num_entries = batadv_tt_entries(tvlv_value_len);
4235
4236         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
4237                               num_entries, tt_data->ttvn);
4238 }
4239
4240 /**
4241  * batadv_tt_tvlv_unicast_handler_v1() - process incoming (unicast) tt tvlv
4242  *  container
4243  * @bat_priv: the bat priv with all the soft interface information
4244  * @src: mac address of tt tvlv sender
4245  * @dst: mac address of tt tvlv recipient
4246  * @tvlv_value: tvlv buffer containing the tt data
4247  * @tvlv_value_len: tvlv buffer length
4248  *
4249  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
4250  * otherwise.
4251  */
4252 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4253                                              u8 *src, u8 *dst,
4254                                              void *tvlv_value,
4255                                              u16 tvlv_value_len)
4256 {
4257         struct batadv_tvlv_tt_data *tt_data;
4258         u16 tt_vlan_len, tt_num_entries;
4259         char tt_flag;
4260         bool ret;
4261
4262         if (tvlv_value_len < sizeof(*tt_data))
4263                 return NET_RX_SUCCESS;
4264
4265         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4266         tvlv_value_len -= sizeof(*tt_data);
4267
4268         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
4269         tt_vlan_len *= ntohs(tt_data->num_vlan);
4270
4271         if (tvlv_value_len < tt_vlan_len)
4272                 return NET_RX_SUCCESS;
4273
4274         tvlv_value_len -= tt_vlan_len;
4275         tt_num_entries = batadv_tt_entries(tvlv_value_len);
4276
4277         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
4278         case BATADV_TT_REQUEST:
4279                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
4280
4281                 /* If this node cannot provide a TT response the tt_request is
4282                  * forwarded
4283                  */
4284                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
4285                 if (!ret) {
4286                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
4287                                 tt_flag = 'F';
4288                         else
4289                                 tt_flag = '.';
4290
4291                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4292                                    "Routing TT_REQUEST to %pM [%c]\n",
4293                                    dst, tt_flag);
4294                         /* tvlv API will re-route the packet */
4295                         return NET_RX_DROP;
4296                 }
4297                 break;
4298         case BATADV_TT_RESPONSE:
4299                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
4300
4301                 if (batadv_is_my_mac(bat_priv, dst)) {
4302                         batadv_handle_tt_response(bat_priv, tt_data,
4303                                                   src, tt_num_entries);
4304                         return NET_RX_SUCCESS;
4305                 }
4306
4307                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
4308                         tt_flag =  'F';
4309                 else
4310                         tt_flag = '.';
4311
4312                 batadv_dbg(BATADV_DBG_TT, bat_priv,
4313                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
4314
4315                 /* tvlv API will re-route the packet */
4316                 return NET_RX_DROP;
4317         }
4318
4319         return NET_RX_SUCCESS;
4320 }
4321
4322 /**
4323  * batadv_roam_tvlv_unicast_handler_v1() - process incoming tt roam tvlv
4324  *  container
4325  * @bat_priv: the bat priv with all the soft interface information
4326  * @src: mac address of tt tvlv sender
4327  * @dst: mac address of tt tvlv recipient
4328  * @tvlv_value: tvlv buffer containing the tt data
4329  * @tvlv_value_len: tvlv buffer length
4330  *
4331  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
4332  * otherwise.
4333  */
4334 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4335                                                u8 *src, u8 *dst,
4336                                                void *tvlv_value,
4337                                                u16 tvlv_value_len)
4338 {
4339         struct batadv_tvlv_roam_adv *roaming_adv;
4340         struct batadv_orig_node *orig_node = NULL;
4341
4342         /* If this node is not the intended recipient of the
4343          * roaming advertisement the packet is forwarded
4344          * (the tvlv API will re-route the packet).
4345          */
4346         if (!batadv_is_my_mac(bat_priv, dst))
4347                 return NET_RX_DROP;
4348
4349         if (tvlv_value_len < sizeof(*roaming_adv))
4350                 goto out;
4351
4352         orig_node = batadv_orig_hash_find(bat_priv, src);
4353         if (!orig_node)
4354                 goto out;
4355
4356         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
4357         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
4358
4359         batadv_dbg(BATADV_DBG_TT, bat_priv,
4360                    "Received ROAMING_ADV from %pM (client %pM)\n",
4361                    src, roaming_adv->client);
4362
4363         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
4364                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
4365                              atomic_read(&orig_node->last_ttvn) + 1);
4366
4367 out:
4368         if (orig_node)
4369                 batadv_orig_node_put(orig_node);
4370         return NET_RX_SUCCESS;
4371 }
4372
4373 /**
4374  * batadv_tt_init() - initialise the translation table internals
4375  * @bat_priv: the bat priv with all the soft interface information
4376  *
4377  * Return: 0 on success or negative error number in case of failure.
4378  */
4379 int batadv_tt_init(struct batadv_priv *bat_priv)
4380 {
4381         int ret;
4382
4383         /* synchronized flags must be remote */
4384         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
4385
4386         ret = batadv_tt_local_init(bat_priv);
4387         if (ret < 0)
4388                 return ret;
4389
4390         ret = batadv_tt_global_init(bat_priv);
4391         if (ret < 0)
4392                 return ret;
4393
4394         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
4395                                      batadv_tt_tvlv_unicast_handler_v1,
4396                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
4397
4398         batadv_tvlv_handler_register(bat_priv, NULL,
4399                                      batadv_roam_tvlv_unicast_handler_v1,
4400                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
4401
4402         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
4403         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
4404                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
4405
4406         return 1;
4407 }
4408
4409 /**
4410  * batadv_tt_global_is_isolated() - check if a client is marked as isolated
4411  * @bat_priv: the bat priv with all the soft interface information
4412  * @addr: the mac address of the client
4413  * @vid: the identifier of the VLAN where this client is connected
4414  *
4415  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
4416  * otherwise
4417  */
4418 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
4419                                   const u8 *addr, unsigned short vid)
4420 {
4421         struct batadv_tt_global_entry *tt;
4422         bool ret;
4423
4424         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
4425         if (!tt)
4426                 return false;
4427
4428         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
4429
4430         batadv_tt_global_entry_put(tt);
4431
4432         return ret;
4433 }
4434
4435 /**
4436  * batadv_tt_cache_init() - Initialize tt memory object cache
4437  *
4438  * Return: 0 on success or negative error number in case of failure.
4439  */
4440 int __init batadv_tt_cache_init(void)
4441 {
4442         size_t tl_size = sizeof(struct batadv_tt_local_entry);
4443         size_t tg_size = sizeof(struct batadv_tt_global_entry);
4444         size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
4445         size_t tt_change_size = sizeof(struct batadv_tt_change_node);
4446         size_t tt_req_size = sizeof(struct batadv_tt_req_node);
4447         size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);
4448
4449         batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
4450                                             SLAB_HWCACHE_ALIGN, NULL);
4451         if (!batadv_tl_cache)
4452                 return -ENOMEM;
4453
4454         batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
4455                                             SLAB_HWCACHE_ALIGN, NULL);
4456         if (!batadv_tg_cache)
4457                 goto err_tt_tl_destroy;
4458
4459         batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
4460                                                  tt_orig_size, 0,
4461                                                  SLAB_HWCACHE_ALIGN, NULL);
4462         if (!batadv_tt_orig_cache)
4463                 goto err_tt_tg_destroy;
4464
4465         batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
4466                                                    tt_change_size, 0,
4467                                                    SLAB_HWCACHE_ALIGN, NULL);
4468         if (!batadv_tt_change_cache)
4469                 goto err_tt_orig_destroy;
4470
4471         batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
4472                                                 tt_req_size, 0,
4473                                                 SLAB_HWCACHE_ALIGN, NULL);
4474         if (!batadv_tt_req_cache)
4475                 goto err_tt_change_destroy;
4476
4477         batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
4478                                                  tt_roam_size, 0,
4479                                                  SLAB_HWCACHE_ALIGN, NULL);
4480         if (!batadv_tt_roam_cache)
4481                 goto err_tt_req_destroy;
4482
4483         return 0;
4484
4485 err_tt_req_destroy:
4486         kmem_cache_destroy(batadv_tt_req_cache);
4487         batadv_tt_req_cache = NULL;
4488 err_tt_change_destroy:
4489         kmem_cache_destroy(batadv_tt_change_cache);
4490         batadv_tt_change_cache = NULL;
4491 err_tt_orig_destroy:
4492         kmem_cache_destroy(batadv_tt_orig_cache);
4493         batadv_tt_orig_cache = NULL;
4494 err_tt_tg_destroy:
4495         kmem_cache_destroy(batadv_tg_cache);
4496         batadv_tg_cache = NULL;
4497 err_tt_tl_destroy:
4498         kmem_cache_destroy(batadv_tl_cache);
4499         batadv_tl_cache = NULL;
4500
4501         return -ENOMEM;
4502 }
4503
4504 /**
4505  * batadv_tt_cache_destroy() - Destroy tt memory object cache
4506  */
4507 void batadv_tt_cache_destroy(void)
4508 {
4509         kmem_cache_destroy(batadv_tl_cache);
4510         kmem_cache_destroy(batadv_tg_cache);
4511         kmem_cache_destroy(batadv_tt_orig_cache);
4512         kmem_cache_destroy(batadv_tt_change_cache);
4513         kmem_cache_destroy(batadv_tt_req_cache);
4514         kmem_cache_destroy(batadv_tt_roam_cache);
4515 }