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                 if (!is_multicast_ether_addr(common->addr))
1709                         common->flags = flags & (~BATADV_TT_SYNC_MASK);
1710
1711                 tt_global_entry->roam_at = 0;
1712                 /* node must store current time in case of roaming. This is
1713                  * needed to purge this entry out on timeout (if nobody claims
1714                  * it)
1715                  */
1716                 if (flags & BATADV_TT_CLIENT_ROAM)
1717                         tt_global_entry->roam_at = jiffies;
1718                 kref_init(&common->refcount);
1719                 common->added_at = jiffies;
1720
1721                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1722                 atomic_set(&tt_global_entry->orig_list_count, 0);
1723                 spin_lock_init(&tt_global_entry->list_lock);
1724
1725                 kref_get(&common->refcount);
1726                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1727                                              batadv_compare_tt,
1728                                              batadv_choose_tt, common,
1729                                              &common->hash_entry);
1730
1731                 if (unlikely(hash_added != 0)) {
1732                         /* remove the reference for the hash */
1733                         batadv_tt_global_entry_put(tt_global_entry);
1734                         goto out_remove;
1735                 }
1736         } else {
1737                 common = &tt_global_entry->common;
1738                 /* If there is already a global entry, we can use this one for
1739                  * our processing.
1740                  * But if we are trying to add a temporary client then here are
1741                  * two options at this point:
1742                  * 1) the global client is not a temporary client: the global
1743                  *    client has to be left as it is, temporary information
1744                  *    should never override any already known client state
1745                  * 2) the global client is a temporary client: purge the
1746                  *    originator list and add the new one orig_entry
1747                  */
1748                 if (flags & BATADV_TT_CLIENT_TEMP) {
1749                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1750                                 goto out;
1751                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1752                                                             orig_node, NULL))
1753                                 goto out_remove;
1754                         batadv_tt_global_del_orig_list(tt_global_entry);
1755                         goto add_orig_entry;
1756                 }
1757
1758                 /* if the client was temporary added before receiving the first
1759                  * OGM announcing it, we have to clear the TEMP flag. Also,
1760                  * remove the previous temporary orig node and re-add it
1761                  * if required. If the orig entry changed, the new one which
1762                  * is a non-temporary entry is preferred.
1763                  */
1764                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1765                         batadv_tt_global_del_orig_list(tt_global_entry);
1766                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1767                 }
1768
1769                 /* the change can carry possible "attribute" flags like the
1770                  * TT_CLIENT_TEMP, therefore they have to be copied in the
1771                  * client entry
1772                  */
1773                 if (!is_multicast_ether_addr(common->addr))
1774                         common->flags |= flags & (~BATADV_TT_SYNC_MASK);
1775
1776                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1777                  * one originator left in the list and we previously received a
1778                  * delete + roaming change for this originator.
1779                  *
1780                  * We should first delete the old originator before adding the
1781                  * new one.
1782                  */
1783                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1784                         batadv_tt_global_del_orig_list(tt_global_entry);
1785                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1786                         tt_global_entry->roam_at = 0;
1787                 }
1788         }
1789 add_orig_entry:
1790         /* add the new orig_entry (if needed) or update it */
1791         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn,
1792                                         flags & BATADV_TT_SYNC_MASK);
1793
1794         batadv_dbg(BATADV_DBG_TT, bat_priv,
1795                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1796                    common->addr, batadv_print_vid(common->vid),
1797                    orig_node->orig);
1798         ret = true;
1799
1800 out_remove:
1801         /* Do not remove multicast addresses from the local hash on
1802          * global additions
1803          */
1804         if (is_multicast_ether_addr(tt_addr))
1805                 goto out;
1806
1807         /* remove address from local hash if present */
1808         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1809                                              "global tt received",
1810                                              flags & BATADV_TT_CLIENT_ROAM);
1811         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1812
1813         if (!(flags & BATADV_TT_CLIENT_ROAM))
1814                 /* this is a normal global add. Therefore the client is not in a
1815                  * roaming state anymore.
1816                  */
1817                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1818
1819 out:
1820         if (tt_global_entry)
1821                 batadv_tt_global_entry_put(tt_global_entry);
1822         if (tt_local_entry)
1823                 batadv_tt_local_entry_put(tt_local_entry);
1824         return ret;
1825 }
1826
1827 /**
1828  * batadv_transtable_best_orig() - Get best originator list entry from tt entry
1829  * @bat_priv: the bat priv with all the soft interface information
1830  * @tt_global_entry: global translation table entry to be analyzed
1831  *
1832  * This functon assumes the caller holds rcu_read_lock().
1833  * Return: best originator list entry or NULL on errors.
1834  */
1835 static struct batadv_tt_orig_list_entry *
1836 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1837                             struct batadv_tt_global_entry *tt_global_entry)
1838 {
1839         struct batadv_neigh_node *router, *best_router = NULL;
1840         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1841         struct hlist_head *head;
1842         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1843
1844         head = &tt_global_entry->orig_list;
1845         hlist_for_each_entry_rcu(orig_entry, head, list) {
1846                 router = batadv_orig_router_get(orig_entry->orig_node,
1847                                                 BATADV_IF_DEFAULT);
1848                 if (!router)
1849                         continue;
1850
1851                 if (best_router &&
1852                     bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
1853                                    BATADV_IF_DEFAULT) <= 0) {
1854                         batadv_neigh_node_put(router);
1855                         continue;
1856                 }
1857
1858                 /* release the refcount for the "old" best */
1859                 if (best_router)
1860                         batadv_neigh_node_put(best_router);
1861
1862                 best_entry = orig_entry;
1863                 best_router = router;
1864         }
1865
1866         if (best_router)
1867                 batadv_neigh_node_put(best_router);
1868
1869         return best_entry;
1870 }
1871
1872 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1873 /**
1874  * batadv_tt_global_print_entry() - print all orig nodes who announce the
1875  *  address for this global entry
1876  * @bat_priv: the bat priv with all the soft interface information
1877  * @tt_global_entry: global translation table entry to be printed
1878  * @seq: debugfs table seq_file struct
1879  *
1880  * This functon assumes the caller holds rcu_read_lock().
1881  */
1882 static void
1883 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1884                              struct batadv_tt_global_entry *tt_global_entry,
1885                              struct seq_file *seq)
1886 {
1887         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1888         struct batadv_tt_common_entry *tt_common_entry;
1889         struct batadv_orig_node_vlan *vlan;
1890         struct hlist_head *head;
1891         u8 last_ttvn;
1892         u16 flags;
1893
1894         tt_common_entry = &tt_global_entry->common;
1895         flags = tt_common_entry->flags;
1896
1897         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1898         if (best_entry) {
1899                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1900                                                  tt_common_entry->vid);
1901                 if (!vlan) {
1902                         seq_printf(seq,
1903                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1904                                    batadv_print_vid(tt_common_entry->vid),
1905                                    best_entry->orig_node->orig);
1906                         goto print_list;
1907                 }
1908
1909                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1910                 seq_printf(seq,
1911                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1912                            '*', tt_global_entry->common.addr,
1913                            batadv_print_vid(tt_global_entry->common.vid),
1914                            best_entry->ttvn, best_entry->orig_node->orig,
1915                            last_ttvn, vlan->tt.crc,
1916                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1917                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1918                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1919                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1920
1921                 batadv_orig_node_vlan_put(vlan);
1922         }
1923
1924 print_list:
1925         head = &tt_global_entry->orig_list;
1926
1927         hlist_for_each_entry_rcu(orig_entry, head, list) {
1928                 if (best_entry == orig_entry)
1929                         continue;
1930
1931                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1932                                                  tt_common_entry->vid);
1933                 if (!vlan) {
1934                         seq_printf(seq,
1935                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1936                                    batadv_print_vid(tt_common_entry->vid),
1937                                    orig_entry->orig_node->orig);
1938                         continue;
1939                 }
1940
1941                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1942                 seq_printf(seq,
1943                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1944                            '+', tt_global_entry->common.addr,
1945                            batadv_print_vid(tt_global_entry->common.vid),
1946                            orig_entry->ttvn, orig_entry->orig_node->orig,
1947                            last_ttvn, vlan->tt.crc,
1948                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1949                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1950                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1951                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1952
1953                 batadv_orig_node_vlan_put(vlan);
1954         }
1955 }
1956
1957 /**
1958  * batadv_tt_global_seq_print_text() - Print the global tt table in a seq file
1959  * @seq: seq file to print on
1960  * @offset: not used
1961  *
1962  * Return: always 0
1963  */
1964 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1965 {
1966         struct net_device *net_dev = (struct net_device *)seq->private;
1967         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1968         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1969         struct batadv_tt_common_entry *tt_common_entry;
1970         struct batadv_tt_global_entry *tt_global;
1971         struct batadv_hard_iface *primary_if;
1972         struct hlist_head *head;
1973         u32 i;
1974
1975         primary_if = batadv_seq_print_text_primary_if_get(seq);
1976         if (!primary_if)
1977                 goto out;
1978
1979         seq_printf(seq,
1980                    "Globally announced TT entries received via the mesh %s\n",
1981                    net_dev->name);
1982         seq_puts(seq,
1983                  "       Client         VID  (TTVN)       Originator      (Curr TTVN) (CRC       ) Flags\n");
1984
1985         for (i = 0; i < hash->size; i++) {
1986                 head = &hash->table[i];
1987
1988                 rcu_read_lock();
1989                 hlist_for_each_entry_rcu(tt_common_entry,
1990                                          head, hash_entry) {
1991                         tt_global = container_of(tt_common_entry,
1992                                                  struct batadv_tt_global_entry,
1993                                                  common);
1994                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1995                 }
1996                 rcu_read_unlock();
1997         }
1998 out:
1999         if (primary_if)
2000                 batadv_hardif_put(primary_if);
2001         return 0;
2002 }
2003 #endif
2004
2005 /**
2006  * batadv_tt_global_dump_subentry() - Dump all TT local entries into a message
2007  * @msg: Netlink message to dump into
2008  * @portid: Port making netlink request
2009  * @seq: Sequence number of netlink message
2010  * @common: tt local & tt global common data
2011  * @orig: Originator node announcing a non-mesh client
2012  * @best: Is the best originator for the TT entry
2013  *
2014  * Return: Error code, or 0 on success
2015  */
2016 static int
2017 batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
2018                                struct batadv_tt_common_entry *common,
2019                                struct batadv_tt_orig_list_entry *orig,
2020                                bool best)
2021 {
2022         u16 flags = (common->flags & (~BATADV_TT_SYNC_MASK)) | orig->flags;
2023         void *hdr;
2024         struct batadv_orig_node_vlan *vlan;
2025         u8 last_ttvn;
2026         u32 crc;
2027
2028         vlan = batadv_orig_node_vlan_get(orig->orig_node,
2029                                          common->vid);
2030         if (!vlan)
2031                 return 0;
2032
2033         crc = vlan->tt.crc;
2034
2035         batadv_orig_node_vlan_put(vlan);
2036
2037         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2038                           NLM_F_MULTI,
2039                           BATADV_CMD_GET_TRANSTABLE_GLOBAL);
2040         if (!hdr)
2041                 return -ENOBUFS;
2042
2043         last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
2044
2045         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
2046             nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2047                     orig->orig_node->orig) ||
2048             nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
2049             nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
2050             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
2051             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
2052             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, flags))
2053                 goto nla_put_failure;
2054
2055         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
2056                 goto nla_put_failure;
2057
2058         genlmsg_end(msg, hdr);
2059         return 0;
2060
2061  nla_put_failure:
2062         genlmsg_cancel(msg, hdr);
2063         return -EMSGSIZE;
2064 }
2065
2066 /**
2067  * batadv_tt_global_dump_entry() - Dump one TT global entry into a message
2068  * @msg: Netlink message to dump into
2069  * @portid: Port making netlink request
2070  * @seq: Sequence number of netlink message
2071  * @bat_priv: The bat priv with all the soft interface information
2072  * @common: tt local & tt global common data
2073  * @sub_s: Number of entries to skip
2074  *
2075  * This function assumes the caller holds rcu_read_lock().
2076  *
2077  * Return: Error code, or 0 on success
2078  */
2079 static int
2080 batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2081                             struct batadv_priv *bat_priv,
2082                             struct batadv_tt_common_entry *common, int *sub_s)
2083 {
2084         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
2085         struct batadv_tt_global_entry *global;
2086         struct hlist_head *head;
2087         int sub = 0;
2088         bool best;
2089
2090         global = container_of(common, struct batadv_tt_global_entry, common);
2091         best_entry = batadv_transtable_best_orig(bat_priv, global);
2092         head = &global->orig_list;
2093
2094         hlist_for_each_entry_rcu(orig_entry, head, list) {
2095                 if (sub++ < *sub_s)
2096                         continue;
2097
2098                 best = (orig_entry == best_entry);
2099
2100                 if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
2101                                                    orig_entry, best)) {
2102                         *sub_s = sub - 1;
2103                         return -EMSGSIZE;
2104                 }
2105         }
2106
2107         *sub_s = 0;
2108         return 0;
2109 }
2110
2111 /**
2112  * batadv_tt_global_dump_bucket() - Dump one TT local bucket into a message
2113  * @msg: Netlink message to dump into
2114  * @portid: Port making netlink request
2115  * @seq: Sequence number of netlink message
2116  * @bat_priv: The bat priv with all the soft interface information
2117  * @head: Pointer to the list containing the global tt entries
2118  * @idx_s: Number of entries to skip
2119  * @sub: Number of entries to skip
2120  *
2121  * Return: Error code, or 0 on success
2122  */
2123 static int
2124 batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2125                              struct batadv_priv *bat_priv,
2126                              struct hlist_head *head, int *idx_s, int *sub)
2127 {
2128         struct batadv_tt_common_entry *common;
2129         int idx = 0;
2130
2131         rcu_read_lock();
2132         hlist_for_each_entry_rcu(common, head, hash_entry) {
2133                 if (idx++ < *idx_s)
2134                         continue;
2135
2136                 if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
2137                                                 common, sub)) {
2138                         rcu_read_unlock();
2139                         *idx_s = idx - 1;
2140                         return -EMSGSIZE;
2141                 }
2142         }
2143         rcu_read_unlock();
2144
2145         *idx_s = 0;
2146         *sub = 0;
2147         return 0;
2148 }
2149
2150 /**
2151  * batadv_tt_global_dump() -  Dump TT global entries into a message
2152  * @msg: Netlink message to dump into
2153  * @cb: Parameters from query
2154  *
2155  * Return: Error code, or length of message on success
2156  */
2157 int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
2158 {
2159         struct net *net = sock_net(cb->skb->sk);
2160         struct net_device *soft_iface;
2161         struct batadv_priv *bat_priv;
2162         struct batadv_hard_iface *primary_if = NULL;
2163         struct batadv_hashtable *hash;
2164         struct hlist_head *head;
2165         int ret;
2166         int ifindex;
2167         int bucket = cb->args[0];
2168         int idx = cb->args[1];
2169         int sub = cb->args[2];
2170         int portid = NETLINK_CB(cb->skb).portid;
2171
2172         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
2173         if (!ifindex)
2174                 return -EINVAL;
2175
2176         soft_iface = dev_get_by_index(net, ifindex);
2177         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2178                 ret = -ENODEV;
2179                 goto out;
2180         }
2181
2182         bat_priv = netdev_priv(soft_iface);
2183
2184         primary_if = batadv_primary_if_get_selected(bat_priv);
2185         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2186                 ret = -ENOENT;
2187                 goto out;
2188         }
2189
2190         hash = bat_priv->tt.global_hash;
2191
2192         while (bucket < hash->size) {
2193                 head = &hash->table[bucket];
2194
2195                 if (batadv_tt_global_dump_bucket(msg, portid,
2196                                                  cb->nlh->nlmsg_seq, bat_priv,
2197                                                  head, &idx, &sub))
2198                         break;
2199
2200                 bucket++;
2201         }
2202
2203         ret = msg->len;
2204
2205  out:
2206         if (primary_if)
2207                 batadv_hardif_put(primary_if);
2208         if (soft_iface)
2209                 dev_put(soft_iface);
2210
2211         cb->args[0] = bucket;
2212         cb->args[1] = idx;
2213         cb->args[2] = sub;
2214
2215         return ret;
2216 }
2217
2218 /**
2219  * _batadv_tt_global_del_orig_entry() - remove and free an orig_entry
2220  * @tt_global_entry: the global entry to remove the orig_entry from
2221  * @orig_entry: the orig entry to remove and free
2222  *
2223  * Remove an orig_entry from its list in the given tt_global_entry and
2224  * free this orig_entry afterwards.
2225  *
2226  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
2227  * part of a list.
2228  */
2229 static void
2230 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
2231                                  struct batadv_tt_orig_list_entry *orig_entry)
2232 {
2233         lockdep_assert_held(&tt_global_entry->list_lock);
2234
2235         batadv_tt_global_size_dec(orig_entry->orig_node,
2236                                   tt_global_entry->common.vid);
2237         atomic_dec(&tt_global_entry->orig_list_count);
2238         /* requires holding tt_global_entry->list_lock and orig_entry->list
2239          * being part of a list
2240          */
2241         hlist_del_rcu(&orig_entry->list);
2242         batadv_tt_orig_list_entry_put(orig_entry);
2243 }
2244
2245 /* deletes the orig list of a tt_global_entry */
2246 static void
2247 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
2248 {
2249         struct hlist_head *head;
2250         struct hlist_node *safe;
2251         struct batadv_tt_orig_list_entry *orig_entry;
2252
2253         spin_lock_bh(&tt_global_entry->list_lock);
2254         head = &tt_global_entry->orig_list;
2255         hlist_for_each_entry_safe(orig_entry, safe, head, list)
2256                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
2257         spin_unlock_bh(&tt_global_entry->list_lock);
2258 }
2259
2260 /**
2261  * batadv_tt_global_del_orig_node() - remove orig_node from a global tt entry
2262  * @bat_priv: the bat priv with all the soft interface information
2263  * @tt_global_entry: the global entry to remove the orig_node from
2264  * @orig_node: the originator announcing the client
2265  * @message: message to append to the log on deletion
2266  *
2267  * Remove the given orig_node and its according orig_entry from the given
2268  * global tt entry.
2269  */
2270 static void
2271 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
2272                                struct batadv_tt_global_entry *tt_global_entry,
2273                                struct batadv_orig_node *orig_node,
2274                                const char *message)
2275 {
2276         struct hlist_head *head;
2277         struct hlist_node *safe;
2278         struct batadv_tt_orig_list_entry *orig_entry;
2279         unsigned short vid;
2280
2281         spin_lock_bh(&tt_global_entry->list_lock);
2282         head = &tt_global_entry->orig_list;
2283         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
2284                 if (orig_entry->orig_node == orig_node) {
2285                         vid = tt_global_entry->common.vid;
2286                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2287                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
2288                                    orig_node->orig,
2289                                    tt_global_entry->common.addr,
2290                                    batadv_print_vid(vid), message);
2291                         _batadv_tt_global_del_orig_entry(tt_global_entry,
2292                                                          orig_entry);
2293                 }
2294         }
2295         spin_unlock_bh(&tt_global_entry->list_lock);
2296 }
2297
2298 /* If the client is to be deleted, we check if it is the last origantor entry
2299  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
2300  * timer, otherwise we simply remove the originator scheduled for deletion.
2301  */
2302 static void
2303 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
2304                              struct batadv_tt_global_entry *tt_global_entry,
2305                              struct batadv_orig_node *orig_node,
2306                              const char *message)
2307 {
2308         bool last_entry = true;
2309         struct hlist_head *head;
2310         struct batadv_tt_orig_list_entry *orig_entry;
2311
2312         /* no local entry exists, case 1:
2313          * Check if this is the last one or if other entries exist.
2314          */
2315
2316         rcu_read_lock();
2317         head = &tt_global_entry->orig_list;
2318         hlist_for_each_entry_rcu(orig_entry, head, list) {
2319                 if (orig_entry->orig_node != orig_node) {
2320                         last_entry = false;
2321                         break;
2322                 }
2323         }
2324         rcu_read_unlock();
2325
2326         if (last_entry) {
2327                 /* its the last one, mark for roaming. */
2328                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
2329                 tt_global_entry->roam_at = jiffies;
2330         } else {
2331                 /* there is another entry, we can simply delete this
2332                  * one and can still use the other one.
2333                  */
2334                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2335                                                orig_node, message);
2336         }
2337 }
2338
2339 /**
2340  * batadv_tt_global_del() - remove a client from the global table
2341  * @bat_priv: the bat priv with all the soft interface information
2342  * @orig_node: an originator serving this client
2343  * @addr: the mac address of the client
2344  * @vid: VLAN identifier
2345  * @message: a message explaining the reason for deleting the client to print
2346  *  for debugging purpose
2347  * @roaming: true if the deletion has been triggered by a roaming event
2348  */
2349 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
2350                                  struct batadv_orig_node *orig_node,
2351                                  const unsigned char *addr, unsigned short vid,
2352                                  const char *message, bool roaming)
2353 {
2354         struct batadv_tt_global_entry *tt_global_entry;
2355         struct batadv_tt_local_entry *local_entry = NULL;
2356
2357         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2358         if (!tt_global_entry)
2359                 goto out;
2360
2361         if (!roaming) {
2362                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2363                                                orig_node, message);
2364
2365                 if (hlist_empty(&tt_global_entry->orig_list))
2366                         batadv_tt_global_free(bat_priv, tt_global_entry,
2367                                               message);
2368
2369                 goto out;
2370         }
2371
2372         /* if we are deleting a global entry due to a roam
2373          * event, there are two possibilities:
2374          * 1) the client roamed from node A to node B => if there
2375          *    is only one originator left for this client, we mark
2376          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
2377          *    wait for node B to claim it. In case of timeout
2378          *    the entry is purged.
2379          *
2380          *    If there are other originators left, we directly delete
2381          *    the originator.
2382          * 2) the client roamed to us => we can directly delete
2383          *    the global entry, since it is useless now.
2384          */
2385         local_entry = batadv_tt_local_hash_find(bat_priv,
2386                                                 tt_global_entry->common.addr,
2387                                                 vid);
2388         if (local_entry) {
2389                 /* local entry exists, case 2: client roamed to us. */
2390                 batadv_tt_global_del_orig_list(tt_global_entry);
2391                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
2392         } else {
2393                 /* no local entry exists, case 1: check for roaming */
2394                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
2395                                              orig_node, message);
2396         }
2397
2398 out:
2399         if (tt_global_entry)
2400                 batadv_tt_global_entry_put(tt_global_entry);
2401         if (local_entry)
2402                 batadv_tt_local_entry_put(local_entry);
2403 }
2404
2405 /**
2406  * batadv_tt_global_del_orig() - remove all the TT global entries belonging to
2407  *  the given originator matching the provided vid
2408  * @bat_priv: the bat priv with all the soft interface information
2409  * @orig_node: the originator owning the entries to remove
2410  * @match_vid: the VLAN identifier to match. If negative all the entries will be
2411  *  removed
2412  * @message: debug message to print as "reason"
2413  */
2414 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
2415                                struct batadv_orig_node *orig_node,
2416                                s32 match_vid,
2417                                const char *message)
2418 {
2419         struct batadv_tt_global_entry *tt_global;
2420         struct batadv_tt_common_entry *tt_common_entry;
2421         u32 i;
2422         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2423         struct hlist_node *safe;
2424         struct hlist_head *head;
2425         spinlock_t *list_lock; /* protects write access to the hash lists */
2426         unsigned short vid;
2427
2428         if (!hash)
2429                 return;
2430
2431         for (i = 0; i < hash->size; i++) {
2432                 head = &hash->table[i];
2433                 list_lock = &hash->list_locks[i];
2434
2435                 spin_lock_bh(list_lock);
2436                 hlist_for_each_entry_safe(tt_common_entry, safe,
2437                                           head, hash_entry) {
2438                         /* remove only matching entries */
2439                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
2440                                 continue;
2441
2442                         tt_global = container_of(tt_common_entry,
2443                                                  struct batadv_tt_global_entry,
2444                                                  common);
2445
2446                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
2447                                                        orig_node, message);
2448
2449                         if (hlist_empty(&tt_global->orig_list)) {
2450                                 vid = tt_global->common.vid;
2451                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
2452                                            "Deleting global tt entry %pM (vid: %d): %s\n",
2453                                            tt_global->common.addr,
2454                                            batadv_print_vid(vid), message);
2455                                 hlist_del_rcu(&tt_common_entry->hash_entry);
2456                                 batadv_tt_global_entry_put(tt_global);
2457                         }
2458                 }
2459                 spin_unlock_bh(list_lock);
2460         }
2461         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2462 }
2463
2464 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
2465                                       char **msg)
2466 {
2467         bool purge = false;
2468         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
2469         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
2470
2471         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
2472             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
2473                 purge = true;
2474                 *msg = "Roaming timeout\n";
2475         }
2476
2477         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
2478             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
2479                 purge = true;
2480                 *msg = "Temporary client timeout\n";
2481         }
2482
2483         return purge;
2484 }
2485
2486 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
2487 {
2488         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2489         struct hlist_head *head;
2490         struct hlist_node *node_tmp;
2491         spinlock_t *list_lock; /* protects write access to the hash lists */
2492         u32 i;
2493         char *msg = NULL;
2494         struct batadv_tt_common_entry *tt_common;
2495         struct batadv_tt_global_entry *tt_global;
2496
2497         for (i = 0; i < hash->size; i++) {
2498                 head = &hash->table[i];
2499                 list_lock = &hash->list_locks[i];
2500
2501                 spin_lock_bh(list_lock);
2502                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2503                                           hash_entry) {
2504                         tt_global = container_of(tt_common,
2505                                                  struct batadv_tt_global_entry,
2506                                                  common);
2507
2508                         if (!batadv_tt_global_to_purge(tt_global, &msg))
2509                                 continue;
2510
2511                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2512                                    "Deleting global tt entry %pM (vid: %d): %s\n",
2513                                    tt_global->common.addr,
2514                                    batadv_print_vid(tt_global->common.vid),
2515                                    msg);
2516
2517                         hlist_del_rcu(&tt_common->hash_entry);
2518
2519                         batadv_tt_global_entry_put(tt_global);
2520                 }
2521                 spin_unlock_bh(list_lock);
2522         }
2523 }
2524
2525 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2526 {
2527         struct batadv_hashtable *hash;
2528         spinlock_t *list_lock; /* protects write access to the hash lists */
2529         struct batadv_tt_common_entry *tt_common_entry;
2530         struct batadv_tt_global_entry *tt_global;
2531         struct hlist_node *node_tmp;
2532         struct hlist_head *head;
2533         u32 i;
2534
2535         if (!bat_priv->tt.global_hash)
2536                 return;
2537
2538         hash = bat_priv->tt.global_hash;
2539
2540         for (i = 0; i < hash->size; i++) {
2541                 head = &hash->table[i];
2542                 list_lock = &hash->list_locks[i];
2543
2544                 spin_lock_bh(list_lock);
2545                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2546                                           head, hash_entry) {
2547                         hlist_del_rcu(&tt_common_entry->hash_entry);
2548                         tt_global = container_of(tt_common_entry,
2549                                                  struct batadv_tt_global_entry,
2550                                                  common);
2551                         batadv_tt_global_entry_put(tt_global);
2552                 }
2553                 spin_unlock_bh(list_lock);
2554         }
2555
2556         batadv_hash_destroy(hash);
2557
2558         bat_priv->tt.global_hash = NULL;
2559 }
2560
2561 static bool
2562 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2563                        struct batadv_tt_global_entry *tt_global_entry)
2564 {
2565         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2566             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2567                 return true;
2568
2569         /* check if the two clients are marked as isolated */
2570         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2571             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2572                 return true;
2573
2574         return false;
2575 }
2576
2577 /**
2578  * batadv_transtable_search() - get the mesh destination for a given client
2579  * @bat_priv: the bat priv with all the soft interface information
2580  * @src: mac address of the source client
2581  * @addr: mac address of the destination client
2582  * @vid: VLAN identifier
2583  *
2584  * Return: a pointer to the originator that was selected as destination in the
2585  * mesh for contacting the client 'addr', NULL otherwise.
2586  * In case of multiple originators serving the same client, the function returns
2587  * the best one (best in terms of metric towards the destination node).
2588  *
2589  * If the two clients are AP isolated the function returns NULL.
2590  */
2591 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2592                                                   const u8 *src,
2593                                                   const u8 *addr,
2594                                                   unsigned short vid)
2595 {
2596         struct batadv_tt_local_entry *tt_local_entry = NULL;
2597         struct batadv_tt_global_entry *tt_global_entry = NULL;
2598         struct batadv_orig_node *orig_node = NULL;
2599         struct batadv_tt_orig_list_entry *best_entry;
2600
2601         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2602                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2603                 if (!tt_local_entry ||
2604                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2605                         goto out;
2606         }
2607
2608         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2609         if (!tt_global_entry)
2610                 goto out;
2611
2612         /* check whether the clients should not communicate due to AP
2613          * isolation
2614          */
2615         if (tt_local_entry &&
2616             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2617                 goto out;
2618
2619         rcu_read_lock();
2620         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2621         /* found anything? */
2622         if (best_entry)
2623                 orig_node = best_entry->orig_node;
2624         if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2625                 orig_node = NULL;
2626         rcu_read_unlock();
2627
2628 out:
2629         if (tt_global_entry)
2630                 batadv_tt_global_entry_put(tt_global_entry);
2631         if (tt_local_entry)
2632                 batadv_tt_local_entry_put(tt_local_entry);
2633
2634         return orig_node;
2635 }
2636
2637 /**
2638  * batadv_tt_global_crc() - calculates the checksum of the local table belonging
2639  *  to the given orig_node
2640  * @bat_priv: the bat priv with all the soft interface information
2641  * @orig_node: originator for which the CRC should be computed
2642  * @vid: VLAN identifier for which the CRC32 has to be computed
2643  *
2644  * This function computes the checksum for the global table corresponding to a
2645  * specific originator. In particular, the checksum is computed as follows: For
2646  * each client connected to the originator the CRC32C of the MAC address and the
2647  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2648  * together.
2649  *
2650  * The idea behind is that CRC32C should be used as much as possible in order to
2651  * produce a unique hash of the table, but since the order which is used to feed
2652  * the CRC32C function affects the result and since every node in the network
2653  * probably sorts the clients differently, the hash function cannot be directly
2654  * computed over the entire table. Hence the CRC32C is used only on
2655  * the single client entry, while all the results are then xor'ed together
2656  * because the XOR operation can combine them all while trying to reduce the
2657  * noise as much as possible.
2658  *
2659  * Return: the checksum of the global table of a given originator.
2660  */
2661 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2662                                 struct batadv_orig_node *orig_node,
2663                                 unsigned short vid)
2664 {
2665         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2666         struct batadv_tt_orig_list_entry *tt_orig;
2667         struct batadv_tt_common_entry *tt_common;
2668         struct batadv_tt_global_entry *tt_global;
2669         struct hlist_head *head;
2670         u32 i, crc_tmp, crc = 0;
2671         u8 flags;
2672         __be16 tmp_vid;
2673
2674         for (i = 0; i < hash->size; i++) {
2675                 head = &hash->table[i];
2676
2677                 rcu_read_lock();
2678                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2679                         tt_global = container_of(tt_common,
2680                                                  struct batadv_tt_global_entry,
2681                                                  common);
2682                         /* compute the CRC only for entries belonging to the
2683                          * VLAN identified by the vid passed as parameter
2684                          */
2685                         if (tt_common->vid != vid)
2686                                 continue;
2687
2688                         /* Roaming clients are in the global table for
2689                          * consistency only. They don't have to be
2690                          * taken into account while computing the
2691                          * global crc
2692                          */
2693                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2694                                 continue;
2695                         /* Temporary clients have not been announced yet, so
2696                          * they have to be skipped while computing the global
2697                          * crc
2698                          */
2699                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2700                                 continue;
2701
2702                         /* find out if this global entry is announced by this
2703                          * originator
2704                          */
2705                         tt_orig = batadv_tt_global_orig_entry_find(tt_global,
2706                                                                    orig_node);
2707                         if (!tt_orig)
2708                                 continue;
2709
2710                         /* use network order to read the VID: this ensures that
2711                          * every node reads the bytes in the same order.
2712                          */
2713                         tmp_vid = htons(tt_common->vid);
2714                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2715
2716                         /* compute the CRC on flags that have to be kept in sync
2717                          * among nodes
2718                          */
2719                         flags = tt_orig->flags;
2720                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2721
2722                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2723
2724                         batadv_tt_orig_list_entry_put(tt_orig);
2725                 }
2726                 rcu_read_unlock();
2727         }
2728
2729         return crc;
2730 }
2731
2732 /**
2733  * batadv_tt_local_crc() - calculates the checksum of the local table
2734  * @bat_priv: the bat priv with all the soft interface information
2735  * @vid: VLAN identifier for which the CRC32 has to be computed
2736  *
2737  * For details about the computation, please refer to the documentation for
2738  * batadv_tt_global_crc().
2739  *
2740  * Return: the checksum of the local table
2741  */
2742 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2743                                unsigned short vid)
2744 {
2745         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2746         struct batadv_tt_common_entry *tt_common;
2747         struct hlist_head *head;
2748         u32 i, crc_tmp, crc = 0;
2749         u8 flags;
2750         __be16 tmp_vid;
2751
2752         for (i = 0; i < hash->size; i++) {
2753                 head = &hash->table[i];
2754
2755                 rcu_read_lock();
2756                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2757                         /* compute the CRC only for entries belonging to the
2758                          * VLAN identified by vid
2759                          */
2760                         if (tt_common->vid != vid)
2761                                 continue;
2762
2763                         /* not yet committed clients have not to be taken into
2764                          * account while computing the CRC
2765                          */
2766                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2767                                 continue;
2768
2769                         /* use network order to read the VID: this ensures that
2770                          * every node reads the bytes in the same order.
2771                          */
2772                         tmp_vid = htons(tt_common->vid);
2773                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2774
2775                         /* compute the CRC on flags that have to be kept in sync
2776                          * among nodes
2777                          */
2778                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2779                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2780
2781                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2782                 }
2783                 rcu_read_unlock();
2784         }
2785
2786         return crc;
2787 }
2788
2789 /**
2790  * batadv_tt_req_node_release() - free tt_req node entry
2791  * @ref: kref pointer of the tt req_node entry
2792  */
2793 static void batadv_tt_req_node_release(struct kref *ref)
2794 {
2795         struct batadv_tt_req_node *tt_req_node;
2796
2797         tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2798
2799         kmem_cache_free(batadv_tt_req_cache, tt_req_node);
2800 }
2801
2802 /**
2803  * batadv_tt_req_node_put() - decrement the tt_req_node refcounter and
2804  *  possibly release it
2805  * @tt_req_node: tt_req_node to be free'd
2806  */
2807 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2808 {
2809         kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2810 }
2811
2812 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2813 {
2814         struct batadv_tt_req_node *node;
2815         struct hlist_node *safe;
2816
2817         spin_lock_bh(&bat_priv->tt.req_list_lock);
2818
2819         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2820                 hlist_del_init(&node->list);
2821                 batadv_tt_req_node_put(node);
2822         }
2823
2824         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2825 }
2826
2827 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2828                                        struct batadv_orig_node *orig_node,
2829                                        const void *tt_buff,
2830                                        u16 tt_buff_len)
2831 {
2832         /* Replace the old buffer only if I received something in the
2833          * last OGM (the OGM could carry no changes)
2834          */
2835         spin_lock_bh(&orig_node->tt_buff_lock);
2836         if (tt_buff_len > 0) {
2837                 kfree(orig_node->tt_buff);
2838                 orig_node->tt_buff_len = 0;
2839                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2840                 if (orig_node->tt_buff) {
2841                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2842                         orig_node->tt_buff_len = tt_buff_len;
2843                 }
2844         }
2845         spin_unlock_bh(&orig_node->tt_buff_lock);
2846 }
2847
2848 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2849 {
2850         struct batadv_tt_req_node *node;
2851         struct hlist_node *safe;
2852
2853         spin_lock_bh(&bat_priv->tt.req_list_lock);
2854         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2855                 if (batadv_has_timed_out(node->issued_at,
2856                                          BATADV_TT_REQUEST_TIMEOUT)) {
2857                         hlist_del_init(&node->list);
2858                         batadv_tt_req_node_put(node);
2859                 }
2860         }
2861         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2862 }
2863
2864 /**
2865  * batadv_tt_req_node_new() - search and possibly create a tt_req_node object
2866  * @bat_priv: the bat priv with all the soft interface information
2867  * @orig_node: orig node this request is being issued for
2868  *
2869  * Return: the pointer to the new tt_req_node struct if no request
2870  * has already been issued for this orig_node, NULL otherwise.
2871  */
2872 static struct batadv_tt_req_node *
2873 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2874                        struct batadv_orig_node *orig_node)
2875 {
2876         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2877
2878         spin_lock_bh(&bat_priv->tt.req_list_lock);
2879         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2880                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2881                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2882                                           BATADV_TT_REQUEST_TIMEOUT))
2883                         goto unlock;
2884         }
2885
2886         tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
2887         if (!tt_req_node)
2888                 goto unlock;
2889
2890         kref_init(&tt_req_node->refcount);
2891         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2892         tt_req_node->issued_at = jiffies;
2893
2894         kref_get(&tt_req_node->refcount);
2895         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2896 unlock:
2897         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2898         return tt_req_node;
2899 }
2900
2901 /**
2902  * batadv_tt_local_valid() - verify local tt entry and get flags
2903  * @entry_ptr: to be checked local tt entry
2904  * @data_ptr: not used but definition required to satisfy the callback prototype
2905  * @flags: a pointer to store TT flags for this client to
2906  *
2907  * Checks the validity of the given local TT entry. If it is, then the provided
2908  * flags pointer is updated.
2909  *
2910  * Return: true if the entry is a valid, false otherwise.
2911  */
2912 static bool batadv_tt_local_valid(const void *entry_ptr,
2913                                   const void *data_ptr,
2914                                   u8 *flags)
2915 {
2916         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2917
2918         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2919                 return false;
2920
2921         if (flags)
2922                 *flags = tt_common_entry->flags;
2923
2924         return true;
2925 }
2926
2927 /**
2928  * batadv_tt_global_valid() - verify global tt entry and get flags
2929  * @entry_ptr: to be checked global tt entry
2930  * @data_ptr: an orig_node object (may be NULL)
2931  * @flags: a pointer to store TT flags for this client to
2932  *
2933  * Checks the validity of the given global TT entry. If it is, then the provided
2934  * flags pointer is updated either with the common (summed) TT flags if data_ptr
2935  * is NULL or the specific, per originator TT flags otherwise.
2936  *
2937  * Return: true if the entry is a valid, false otherwise.
2938  */
2939 static bool batadv_tt_global_valid(const void *entry_ptr,
2940                                    const void *data_ptr,
2941                                    u8 *flags)
2942 {
2943         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2944         const struct batadv_tt_global_entry *tt_global_entry;
2945         const struct batadv_orig_node *orig_node = data_ptr;
2946
2947         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2948             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2949                 return false;
2950
2951         tt_global_entry = container_of(tt_common_entry,
2952                                        struct batadv_tt_global_entry,
2953                                        common);
2954
2955         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node,
2956                                                flags);
2957 }
2958
2959 /**
2960  * batadv_tt_tvlv_generate() - fill the tvlv buff with the tt entries from the
2961  *  specified tt hash
2962  * @bat_priv: the bat priv with all the soft interface information
2963  * @hash: hash table containing the tt entries
2964  * @tt_len: expected tvlv tt data buffer length in number of bytes
2965  * @tvlv_buff: pointer to the buffer to fill with the TT data
2966  * @valid_cb: function to filter tt change entries and to return TT flags
2967  * @cb_data: data passed to the filter function as argument
2968  *
2969  * Fills the tvlv buff with the tt entries from the specified hash. If valid_cb
2970  * is not provided then this becomes a no-op.
2971  */
2972 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2973                                     struct batadv_hashtable *hash,
2974                                     void *tvlv_buff, u16 tt_len,
2975                                     bool (*valid_cb)(const void *,
2976                                                      const void *,
2977                                                      u8 *flags),
2978                                     void *cb_data)
2979 {
2980         struct batadv_tt_common_entry *tt_common_entry;
2981         struct batadv_tvlv_tt_change *tt_change;
2982         struct hlist_head *head;
2983         u16 tt_tot, tt_num_entries = 0;
2984         u8 flags;
2985         bool ret;
2986         u32 i;
2987
2988         tt_tot = batadv_tt_entries(tt_len);
2989         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2990
2991         if (!valid_cb)
2992                 return;
2993
2994         rcu_read_lock();
2995         for (i = 0; i < hash->size; i++) {
2996                 head = &hash->table[i];
2997
2998                 hlist_for_each_entry_rcu(tt_common_entry,
2999                                          head, hash_entry) {
3000                         if (tt_tot == tt_num_entries)
3001                                 break;
3002
3003                         ret = valid_cb(tt_common_entry, cb_data, &flags);
3004                         if (!ret)
3005                                 continue;
3006
3007                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
3008                         tt_change->flags = flags;
3009                         tt_change->vid = htons(tt_common_entry->vid);
3010                         memset(tt_change->reserved, 0,
3011                                sizeof(tt_change->reserved));
3012
3013                         tt_num_entries++;
3014                         tt_change++;
3015                 }
3016         }
3017         rcu_read_unlock();
3018 }
3019
3020 /**
3021  * batadv_tt_global_check_crc() - check if all the CRCs are correct
3022  * @orig_node: originator for which the CRCs have to be checked
3023  * @tt_vlan: pointer to the first tvlv VLAN entry
3024  * @num_vlan: number of tvlv VLAN entries
3025  *
3026  * Return: true if all the received CRCs match the locally stored ones, false
3027  * otherwise
3028  */
3029 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
3030                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
3031                                        u16 num_vlan)
3032 {
3033         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
3034         struct batadv_orig_node_vlan *vlan;
3035         int i, orig_num_vlan;
3036         u32 crc;
3037
3038         /* check if each received CRC matches the locally stored one */
3039         for (i = 0; i < num_vlan; i++) {
3040                 tt_vlan_tmp = tt_vlan + i;
3041
3042                 /* if orig_node is a backbone node for this VLAN, don't check
3043                  * the CRC as we ignore all the global entries over it
3044                  */
3045                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
3046                                                    orig_node->orig,
3047                                                    ntohs(tt_vlan_tmp->vid)))
3048                         continue;
3049
3050                 vlan = batadv_orig_node_vlan_get(orig_node,
3051                                                  ntohs(tt_vlan_tmp->vid));
3052                 if (!vlan)
3053                         return false;
3054
3055                 crc = vlan->tt.crc;
3056                 batadv_orig_node_vlan_put(vlan);
3057
3058                 if (crc != ntohl(tt_vlan_tmp->crc))
3059                         return false;
3060         }
3061
3062         /* check if any excess VLANs exist locally for the originator
3063          * which are not mentioned in the TVLV from the originator.
3064          */
3065         rcu_read_lock();
3066         orig_num_vlan = 0;
3067         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
3068                 orig_num_vlan++;
3069         rcu_read_unlock();
3070
3071         if (orig_num_vlan > num_vlan)
3072                 return false;
3073
3074         return true;
3075 }
3076
3077 /**
3078  * batadv_tt_local_update_crc() - update all the local CRCs
3079  * @bat_priv: the bat priv with all the soft interface information
3080  */
3081 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
3082 {
3083         struct batadv_softif_vlan *vlan;
3084
3085         /* recompute the global CRC for each VLAN */
3086         rcu_read_lock();
3087         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
3088                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
3089         }
3090         rcu_read_unlock();
3091 }
3092
3093 /**
3094  * batadv_tt_global_update_crc() - update all the global CRCs for this orig_node
3095  * @bat_priv: the bat priv with all the soft interface information
3096  * @orig_node: the orig_node for which the CRCs have to be updated
3097  */
3098 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
3099                                         struct batadv_orig_node *orig_node)
3100 {
3101         struct batadv_orig_node_vlan *vlan;
3102         u32 crc;
3103
3104         /* recompute the global CRC for each VLAN */
3105         rcu_read_lock();
3106         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
3107                 /* if orig_node is a backbone node for this VLAN, don't compute
3108                  * the CRC as we ignore all the global entries over it
3109                  */
3110                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
3111                                                    vlan->vid))
3112                         continue;
3113
3114                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
3115                 vlan->tt.crc = crc;
3116         }
3117         rcu_read_unlock();
3118 }
3119
3120 /**
3121  * batadv_send_tt_request() - send a TT Request message to a given node
3122  * @bat_priv: the bat priv with all the soft interface information
3123  * @dst_orig_node: the destination of the message
3124  * @ttvn: the version number that the source of the message is looking for
3125  * @tt_vlan: pointer to the first tvlv VLAN object to request
3126  * @num_vlan: number of tvlv VLAN entries
3127  * @full_table: ask for the entire translation table if true, while only for the
3128  *  last TT diff otherwise
3129  *
3130  * Return: true if the TT Request was sent, false otherwise
3131  */
3132 static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
3133                                    struct batadv_orig_node *dst_orig_node,
3134                                    u8 ttvn,
3135                                    struct batadv_tvlv_tt_vlan_data *tt_vlan,
3136                                    u16 num_vlan, bool full_table)
3137 {
3138         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3139         struct batadv_tt_req_node *tt_req_node = NULL;
3140         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
3141         struct batadv_hard_iface *primary_if;
3142         bool ret = false;
3143         int i, size;
3144
3145         primary_if = batadv_primary_if_get_selected(bat_priv);
3146         if (!primary_if)
3147                 goto out;
3148
3149         /* The new tt_req will be issued only if I'm not waiting for a
3150          * reply from the same orig_node yet
3151          */
3152         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
3153         if (!tt_req_node)
3154                 goto out;
3155
3156         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
3157         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
3158         if (!tvlv_tt_data)
3159                 goto out;
3160
3161         tvlv_tt_data->flags = BATADV_TT_REQUEST;
3162         tvlv_tt_data->ttvn = ttvn;
3163         tvlv_tt_data->num_vlan = htons(num_vlan);
3164
3165         /* send all the CRCs within the request. This is needed by intermediate
3166          * nodes to ensure they have the correct table before replying
3167          */
3168         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
3169         for (i = 0; i < num_vlan; i++) {
3170                 tt_vlan_req->vid = tt_vlan->vid;
3171                 tt_vlan_req->crc = tt_vlan->crc;
3172
3173                 tt_vlan_req++;
3174                 tt_vlan++;
3175         }
3176
3177         if (full_table)
3178                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3179
3180         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
3181                    dst_orig_node->orig, full_table ? 'F' : '.');
3182
3183         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
3184         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3185                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
3186                                  tvlv_tt_data, size);
3187         ret = true;
3188
3189 out:
3190         if (primary_if)
3191                 batadv_hardif_put(primary_if);
3192
3193         if (ret && tt_req_node) {
3194                 spin_lock_bh(&bat_priv->tt.req_list_lock);
3195                 if (!hlist_unhashed(&tt_req_node->list)) {
3196                         hlist_del_init(&tt_req_node->list);
3197                         batadv_tt_req_node_put(tt_req_node);
3198                 }
3199                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3200         }
3201
3202         if (tt_req_node)
3203                 batadv_tt_req_node_put(tt_req_node);
3204
3205         kfree(tvlv_tt_data);
3206         return ret;
3207 }
3208
3209 /**
3210  * batadv_send_other_tt_response() - send reply to tt request concerning another
3211  *  node's translation table
3212  * @bat_priv: the bat priv with all the soft interface information
3213  * @tt_data: tt data containing the tt request information
3214  * @req_src: mac address of tt request sender
3215  * @req_dst: mac address of tt request recipient
3216  *
3217  * Return: true if tt request reply was sent, false otherwise.
3218  */
3219 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
3220                                           struct batadv_tvlv_tt_data *tt_data,
3221                                           u8 *req_src, u8 *req_dst)
3222 {
3223         struct batadv_orig_node *req_dst_orig_node;
3224         struct batadv_orig_node *res_dst_orig_node = NULL;
3225         struct batadv_tvlv_tt_change *tt_change;
3226         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3227         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3228         bool ret = false, full_table;
3229         u8 orig_ttvn, req_ttvn;
3230         u16 tvlv_len;
3231         s32 tt_len;
3232
3233         batadv_dbg(BATADV_DBG_TT, bat_priv,
3234                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
3235                    req_src, tt_data->ttvn, req_dst,
3236                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3237
3238         /* Let's get the orig node of the REAL destination */
3239         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
3240         if (!req_dst_orig_node)
3241                 goto out;
3242
3243         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
3244         if (!res_dst_orig_node)
3245                 goto out;
3246
3247         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
3248         req_ttvn = tt_data->ttvn;
3249
3250         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3251         /* this node doesn't have the requested data */
3252         if (orig_ttvn != req_ttvn ||
3253             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
3254                                         ntohs(tt_data->num_vlan)))
3255                 goto out;
3256
3257         /* If the full table has been explicitly requested */
3258         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
3259             !req_dst_orig_node->tt_buff)
3260                 full_table = true;
3261         else
3262                 full_table = false;
3263
3264         /* TT fragmentation hasn't been implemented yet, so send as many
3265          * TT entries fit a single packet as possible only
3266          */
3267         if (!full_table) {
3268                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
3269                 tt_len = req_dst_orig_node->tt_buff_len;
3270
3271                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3272                                                               &tvlv_tt_data,
3273                                                               &tt_change,
3274                                                               &tt_len);
3275                 if (!tt_len)
3276                         goto unlock;
3277
3278                 /* Copy the last orig_node's OGM buffer */
3279                 memcpy(tt_change, req_dst_orig_node->tt_buff,
3280                        req_dst_orig_node->tt_buff_len);
3281                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3282         } else {
3283                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3284                  * in the initial part
3285                  */
3286                 tt_len = -1;
3287                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3288                                                               &tvlv_tt_data,
3289                                                               &tt_change,
3290                                                               &tt_len);
3291                 if (!tt_len)
3292                         goto out;
3293
3294                 /* fill the rest of the tvlv with the real TT entries */
3295                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
3296                                         tt_change, tt_len,
3297                                         batadv_tt_global_valid,
3298                                         req_dst_orig_node);
3299         }
3300
3301         /* Don't send the response, if larger than fragmented packet. */
3302         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
3303         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
3304                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
3305                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
3306                                          res_dst_orig_node->orig);
3307                 goto out;
3308         }
3309
3310         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3311         tvlv_tt_data->ttvn = req_ttvn;
3312
3313         if (full_table)
3314                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3315
3316         batadv_dbg(BATADV_DBG_TT, bat_priv,
3317                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
3318                    res_dst_orig_node->orig, req_dst_orig_node->orig,
3319                    full_table ? 'F' : '.', req_ttvn);
3320
3321         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3322
3323         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
3324                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3325                                  tvlv_len);
3326
3327         ret = true;
3328         goto out;
3329
3330 unlock:
3331         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3332
3333 out:
3334         if (res_dst_orig_node)
3335                 batadv_orig_node_put(res_dst_orig_node);
3336         if (req_dst_orig_node)
3337                 batadv_orig_node_put(req_dst_orig_node);
3338         kfree(tvlv_tt_data);
3339         return ret;
3340 }
3341
3342 /**
3343  * batadv_send_my_tt_response() - send reply to tt request concerning this
3344  *  node's translation table
3345  * @bat_priv: the bat priv with all the soft interface information
3346  * @tt_data: tt data containing the tt request information
3347  * @req_src: mac address of tt request sender
3348  *
3349  * Return: true if tt request reply was sent, false otherwise.
3350  */
3351 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
3352                                        struct batadv_tvlv_tt_data *tt_data,
3353                                        u8 *req_src)
3354 {
3355         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3356         struct batadv_hard_iface *primary_if = NULL;
3357         struct batadv_tvlv_tt_change *tt_change;
3358         struct batadv_orig_node *orig_node;
3359         u8 my_ttvn, req_ttvn;
3360         u16 tvlv_len;
3361         bool full_table;
3362         s32 tt_len;
3363
3364         batadv_dbg(BATADV_DBG_TT, bat_priv,
3365                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
3366                    req_src, tt_data->ttvn,
3367                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3368
3369         spin_lock_bh(&bat_priv->tt.commit_lock);
3370
3371         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3372         req_ttvn = tt_data->ttvn;
3373
3374         orig_node = batadv_orig_hash_find(bat_priv, req_src);
3375         if (!orig_node)
3376                 goto out;
3377
3378         primary_if = batadv_primary_if_get_selected(bat_priv);
3379         if (!primary_if)
3380                 goto out;
3381
3382         /* If the full table has been explicitly requested or the gap
3383          * is too big send the whole local translation table
3384          */
3385         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
3386             !bat_priv->tt.last_changeset)
3387                 full_table = true;
3388         else
3389                 full_table = false;
3390
3391         /* TT fragmentation hasn't been implemented yet, so send as many
3392          * TT entries fit a single packet as possible only
3393          */
3394         if (!full_table) {
3395                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
3396
3397                 tt_len = bat_priv->tt.last_changeset_len;
3398                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3399                                                              &tvlv_tt_data,
3400                                                              &tt_change,
3401                                                              &tt_len);
3402                 if (!tt_len || !tvlv_len)
3403                         goto unlock;
3404
3405                 /* Copy the last orig_node's OGM buffer */
3406                 memcpy(tt_change, bat_priv->tt.last_changeset,
3407                        bat_priv->tt.last_changeset_len);
3408                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3409         } else {
3410                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3411
3412                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3413                  * in the initial part
3414                  */
3415                 tt_len = -1;
3416                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3417                                                              &tvlv_tt_data,
3418                                                              &tt_change,
3419                                                              &tt_len);
3420                 if (!tt_len || !tvlv_len)
3421                         goto out;
3422
3423                 /* fill the rest of the tvlv with the real TT entries */
3424                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
3425                                         tt_change, tt_len,
3426                                         batadv_tt_local_valid, NULL);
3427         }
3428
3429         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3430         tvlv_tt_data->ttvn = req_ttvn;
3431
3432         if (full_table)
3433                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3434
3435         batadv_dbg(BATADV_DBG_TT, bat_priv,
3436                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
3437                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
3438
3439         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3440
3441         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3442                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3443                                  tvlv_len);
3444
3445         goto out;
3446
3447 unlock:
3448         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3449 out:
3450         spin_unlock_bh(&bat_priv->tt.commit_lock);
3451         if (orig_node)
3452                 batadv_orig_node_put(orig_node);
3453         if (primary_if)
3454                 batadv_hardif_put(primary_if);
3455         kfree(tvlv_tt_data);
3456         /* The packet was for this host, so it doesn't need to be re-routed */
3457         return true;
3458 }
3459
3460 /**
3461  * batadv_send_tt_response() - send reply to tt request
3462  * @bat_priv: the bat priv with all the soft interface information
3463  * @tt_data: tt data containing the tt request information
3464  * @req_src: mac address of tt request sender
3465  * @req_dst: mac address of tt request recipient
3466  *
3467  * Return: true if tt request reply was sent, false otherwise.
3468  */
3469 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
3470                                     struct batadv_tvlv_tt_data *tt_data,
3471                                     u8 *req_src, u8 *req_dst)
3472 {
3473         if (batadv_is_my_mac(bat_priv, req_dst))
3474                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
3475         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
3476                                              req_dst);
3477 }
3478
3479 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
3480                                       struct batadv_orig_node *orig_node,
3481                                       struct batadv_tvlv_tt_change *tt_change,
3482                                       u16 tt_num_changes, u8 ttvn)
3483 {
3484         int i;
3485         int roams;
3486
3487         for (i = 0; i < tt_num_changes; i++) {
3488                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
3489                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
3490                         batadv_tt_global_del(bat_priv, orig_node,
3491                                              (tt_change + i)->addr,
3492                                              ntohs((tt_change + i)->vid),
3493                                              "tt removed by changes",
3494                                              roams);
3495                 } else {
3496                         if (!batadv_tt_global_add(bat_priv, orig_node,
3497                                                   (tt_change + i)->addr,
3498                                                   ntohs((tt_change + i)->vid),
3499                                                   (tt_change + i)->flags, ttvn))
3500                                 /* In case of problem while storing a
3501                                  * global_entry, we stop the updating
3502                                  * procedure without committing the
3503                                  * ttvn change. This will avoid to send
3504                                  * corrupted data on tt_request
3505                                  */
3506                                 return;
3507                 }
3508         }
3509         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
3510 }
3511
3512 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
3513                                   struct batadv_tvlv_tt_change *tt_change,
3514                                   u8 ttvn, u8 *resp_src,
3515                                   u16 num_entries)
3516 {
3517         struct batadv_orig_node *orig_node;
3518
3519         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3520         if (!orig_node)
3521                 goto out;
3522
3523         /* Purge the old table first.. */
3524         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
3525                                   "Received full table");
3526
3527         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
3528                                   ttvn);
3529
3530         spin_lock_bh(&orig_node->tt_buff_lock);
3531         kfree(orig_node->tt_buff);
3532         orig_node->tt_buff_len = 0;
3533         orig_node->tt_buff = NULL;
3534         spin_unlock_bh(&orig_node->tt_buff_lock);
3535
3536         atomic_set(&orig_node->last_ttvn, ttvn);
3537
3538 out:
3539         if (orig_node)
3540                 batadv_orig_node_put(orig_node);
3541 }
3542
3543 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
3544                                      struct batadv_orig_node *orig_node,
3545                                      u16 tt_num_changes, u8 ttvn,
3546                                      struct batadv_tvlv_tt_change *tt_change)
3547 {
3548         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
3549                                   tt_num_changes, ttvn);
3550
3551         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3552                                    batadv_tt_len(tt_num_changes));
3553         atomic_set(&orig_node->last_ttvn, ttvn);
3554 }
3555
3556 /**
3557  * batadv_is_my_client() - check if a client is served by the local node
3558  * @bat_priv: the bat priv with all the soft interface information
3559  * @addr: the mac address of the client to check
3560  * @vid: VLAN identifier
3561  *
3562  * Return: true if the client is served by this node, false otherwise.
3563  */
3564 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3565                          unsigned short vid)
3566 {
3567         struct batadv_tt_local_entry *tt_local_entry;
3568         bool ret = false;
3569
3570         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3571         if (!tt_local_entry)
3572                 goto out;
3573         /* Check if the client has been logically deleted (but is kept for
3574          * consistency purpose)
3575          */
3576         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3577             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3578                 goto out;
3579         ret = true;
3580 out:
3581         if (tt_local_entry)
3582                 batadv_tt_local_entry_put(tt_local_entry);
3583         return ret;
3584 }
3585
3586 /**
3587  * batadv_handle_tt_response() - process incoming tt reply
3588  * @bat_priv: the bat priv with all the soft interface information
3589  * @tt_data: tt data containing the tt request information
3590  * @resp_src: mac address of tt reply sender
3591  * @num_entries: number of tt change entries appended to the tt data
3592  */
3593 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3594                                       struct batadv_tvlv_tt_data *tt_data,
3595                                       u8 *resp_src, u16 num_entries)
3596 {
3597         struct batadv_tt_req_node *node;
3598         struct hlist_node *safe;
3599         struct batadv_orig_node *orig_node = NULL;
3600         struct batadv_tvlv_tt_change *tt_change;
3601         u8 *tvlv_ptr = (u8 *)tt_data;
3602         u16 change_offset;
3603
3604         batadv_dbg(BATADV_DBG_TT, bat_priv,
3605                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3606                    resp_src, tt_data->ttvn, num_entries,
3607                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3608
3609         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3610         if (!orig_node)
3611                 goto out;
3612
3613         spin_lock_bh(&orig_node->tt_lock);
3614
3615         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3616         change_offset *= ntohs(tt_data->num_vlan);
3617         change_offset += sizeof(*tt_data);
3618         tvlv_ptr += change_offset;
3619
3620         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3621         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3622                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3623                                       resp_src, num_entries);
3624         } else {
3625                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3626                                          tt_data->ttvn, tt_change);
3627         }
3628
3629         /* Recalculate the CRC for this orig_node and store it */
3630         batadv_tt_global_update_crc(bat_priv, orig_node);
3631
3632         spin_unlock_bh(&orig_node->tt_lock);
3633
3634         /* Delete the tt_req_node from pending tt_requests list */
3635         spin_lock_bh(&bat_priv->tt.req_list_lock);
3636         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3637                 if (!batadv_compare_eth(node->addr, resp_src))
3638                         continue;
3639                 hlist_del_init(&node->list);
3640                 batadv_tt_req_node_put(node);
3641         }
3642
3643         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3644 out:
3645         if (orig_node)
3646                 batadv_orig_node_put(orig_node);
3647 }
3648
3649 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3650 {
3651         struct batadv_tt_roam_node *node, *safe;
3652
3653         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3654
3655         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3656                 list_del(&node->list);
3657                 kmem_cache_free(batadv_tt_roam_cache, node);
3658         }
3659
3660         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3661 }
3662
3663 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3664 {
3665         struct batadv_tt_roam_node *node, *safe;
3666
3667         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3668         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3669                 if (!batadv_has_timed_out(node->first_time,
3670                                           BATADV_ROAMING_MAX_TIME))
3671                         continue;
3672
3673                 list_del(&node->list);
3674                 kmem_cache_free(batadv_tt_roam_cache, node);
3675         }
3676         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3677 }
3678
3679 /**
3680  * batadv_tt_check_roam_count() - check if a client has roamed too frequently
3681  * @bat_priv: the bat priv with all the soft interface information
3682  * @client: mac address of the roaming client
3683  *
3684  * This function checks whether the client already reached the
3685  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3686  * will not be sent.
3687  *
3688  * Return: true if the ROAMING_ADV can be sent, false otherwise
3689  */
3690 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3691 {
3692         struct batadv_tt_roam_node *tt_roam_node;
3693         bool ret = false;
3694
3695         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3696         /* The new tt_req will be issued only if I'm not waiting for a
3697          * reply from the same orig_node yet
3698          */
3699         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3700                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3701                         continue;
3702
3703                 if (batadv_has_timed_out(tt_roam_node->first_time,
3704                                          BATADV_ROAMING_MAX_TIME))
3705                         continue;
3706
3707                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3708                         /* Sorry, you roamed too many times! */
3709                         goto unlock;
3710                 ret = true;
3711                 break;
3712         }
3713
3714         if (!ret) {
3715                 tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
3716                                                 GFP_ATOMIC);
3717                 if (!tt_roam_node)
3718                         goto unlock;
3719
3720                 tt_roam_node->first_time = jiffies;
3721                 atomic_set(&tt_roam_node->counter,
3722                            BATADV_ROAMING_MAX_COUNT - 1);
3723                 ether_addr_copy(tt_roam_node->addr, client);
3724
3725                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3726                 ret = true;
3727         }
3728
3729 unlock:
3730         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3731         return ret;
3732 }
3733
3734 /**
3735  * batadv_send_roam_adv() - send a roaming advertisement message
3736  * @bat_priv: the bat priv with all the soft interface information
3737  * @client: mac address of the roaming client
3738  * @vid: VLAN identifier
3739  * @orig_node: message destination
3740  *
3741  * Send a ROAMING_ADV message to the node which was previously serving this
3742  * client. This is done to inform the node that from now on all traffic destined
3743  * for this particular roamed client has to be forwarded to the sender of the
3744  * roaming message.
3745  */
3746 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3747                                  unsigned short vid,
3748                                  struct batadv_orig_node *orig_node)
3749 {
3750         struct batadv_hard_iface *primary_if;
3751         struct batadv_tvlv_roam_adv tvlv_roam;
3752
3753         primary_if = batadv_primary_if_get_selected(bat_priv);
3754         if (!primary_if)
3755                 goto out;
3756
3757         /* before going on we have to check whether the client has
3758          * already roamed to us too many times
3759          */
3760         if (!batadv_tt_check_roam_count(bat_priv, client))
3761                 goto out;
3762
3763         batadv_dbg(BATADV_DBG_TT, bat_priv,
3764                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3765                    orig_node->orig, client, batadv_print_vid(vid));
3766
3767         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3768
3769         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3770         tvlv_roam.vid = htons(vid);
3771
3772         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3773                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3774                                  &tvlv_roam, sizeof(tvlv_roam));
3775
3776 out:
3777         if (primary_if)
3778                 batadv_hardif_put(primary_if);
3779 }
3780
3781 static void batadv_tt_purge(struct work_struct *work)
3782 {
3783         struct delayed_work *delayed_work;
3784         struct batadv_priv_tt *priv_tt;
3785         struct batadv_priv *bat_priv;
3786
3787         delayed_work = to_delayed_work(work);
3788         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3789         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3790
3791         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3792         batadv_tt_global_purge(bat_priv);
3793         batadv_tt_req_purge(bat_priv);
3794         batadv_tt_roam_purge(bat_priv);
3795
3796         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3797                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3798 }
3799
3800 /**
3801  * batadv_tt_free() - Free translation table of soft interface
3802  * @bat_priv: the bat priv with all the soft interface information
3803  */
3804 void batadv_tt_free(struct batadv_priv *bat_priv)
3805 {
3806         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3807         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3808
3809         cancel_delayed_work_sync(&bat_priv->tt.work);
3810
3811         batadv_tt_local_table_free(bat_priv);
3812         batadv_tt_global_table_free(bat_priv);
3813         batadv_tt_req_list_free(bat_priv);
3814         batadv_tt_changes_list_free(bat_priv);
3815         batadv_tt_roam_list_free(bat_priv);
3816
3817         kfree(bat_priv->tt.last_changeset);
3818 }
3819
3820 /**
3821  * batadv_tt_local_set_flags() - set or unset the specified flags on the local
3822  *  table and possibly count them in the TT size
3823  * @bat_priv: the bat priv with all the soft interface information
3824  * @flags: the flag to switch
3825  * @enable: whether to set or unset the flag
3826  * @count: whether to increase the TT size by the number of changed entries
3827  */
3828 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3829                                       bool enable, bool count)
3830 {
3831         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3832         struct batadv_tt_common_entry *tt_common_entry;
3833         struct hlist_head *head;
3834         u32 i;
3835
3836         if (!hash)
3837                 return;
3838
3839         for (i = 0; i < hash->size; i++) {
3840                 head = &hash->table[i];
3841
3842                 rcu_read_lock();
3843                 hlist_for_each_entry_rcu(tt_common_entry,
3844                                          head, hash_entry) {
3845                         if (enable) {
3846                                 if ((tt_common_entry->flags & flags) == flags)
3847                                         continue;
3848                                 tt_common_entry->flags |= flags;
3849                         } else {
3850                                 if (!(tt_common_entry->flags & flags))
3851                                         continue;
3852                                 tt_common_entry->flags &= ~flags;
3853                         }
3854
3855                         if (!count)
3856                                 continue;
3857
3858                         batadv_tt_local_size_inc(bat_priv,
3859                                                  tt_common_entry->vid);
3860                 }
3861                 rcu_read_unlock();
3862         }
3863 }
3864
3865 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3866 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3867 {
3868         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3869         struct batadv_tt_common_entry *tt_common;
3870         struct batadv_tt_local_entry *tt_local;
3871         struct hlist_node *node_tmp;
3872         struct hlist_head *head;
3873         spinlock_t *list_lock; /* protects write access to the hash lists */
3874         u32 i;
3875
3876         if (!hash)
3877                 return;
3878
3879         for (i = 0; i < hash->size; i++) {
3880                 head = &hash->table[i];
3881                 list_lock = &hash->list_locks[i];
3882
3883                 spin_lock_bh(list_lock);
3884                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3885                                           hash_entry) {
3886                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3887                                 continue;
3888
3889                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3890                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3891                                    tt_common->addr,
3892                                    batadv_print_vid(tt_common->vid));
3893
3894                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3895                         hlist_del_rcu(&tt_common->hash_entry);
3896                         tt_local = container_of(tt_common,
3897                                                 struct batadv_tt_local_entry,
3898                                                 common);
3899
3900                         batadv_tt_local_entry_put(tt_local);
3901                 }
3902                 spin_unlock_bh(list_lock);
3903         }
3904 }
3905
3906 /**
3907  * batadv_tt_local_commit_changes_nolock() - commit all pending local tt changes
3908  *  which have been queued in the time since the last commit
3909  * @bat_priv: the bat priv with all the soft interface information
3910  *
3911  * Caller must hold tt->commit_lock.
3912  */
3913 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3914 {
3915         lockdep_assert_held(&bat_priv->tt.commit_lock);
3916
3917         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3918                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3919                         batadv_tt_tvlv_container_update(bat_priv);
3920                 return;
3921         }
3922
3923         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3924
3925         batadv_tt_local_purge_pending_clients(bat_priv);
3926         batadv_tt_local_update_crc(bat_priv);
3927
3928         /* Increment the TTVN only once per OGM interval */
3929         atomic_inc(&bat_priv->tt.vn);
3930         batadv_dbg(BATADV_DBG_TT, bat_priv,
3931                    "Local changes committed, updating to ttvn %u\n",
3932                    (u8)atomic_read(&bat_priv->tt.vn));
3933
3934         /* reset the sending counter */
3935         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3936         batadv_tt_tvlv_container_update(bat_priv);
3937 }
3938
3939 /**
3940  * batadv_tt_local_commit_changes() - commit all pending local tt changes which
3941  *  have been queued in the time since the last commit
3942  * @bat_priv: the bat priv with all the soft interface information
3943  */
3944 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3945 {
3946         spin_lock_bh(&bat_priv->tt.commit_lock);
3947         batadv_tt_local_commit_changes_nolock(bat_priv);
3948         spin_unlock_bh(&bat_priv->tt.commit_lock);
3949 }
3950
3951 /**
3952  * batadv_is_ap_isolated() - Check if packet from upper layer should be dropped
3953  * @bat_priv: the bat priv with all the soft interface information
3954  * @src: source mac address of packet
3955  * @dst: destination mac address of packet
3956  * @vid: vlan id of packet
3957  *
3958  * Return: true when src+dst(+vid) pair should be isolated, false otherwise
3959  */
3960 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3961                            unsigned short vid)
3962 {
3963         struct batadv_tt_local_entry *tt_local_entry;
3964         struct batadv_tt_global_entry *tt_global_entry;
3965         struct batadv_softif_vlan *vlan;
3966         bool ret = false;
3967
3968         vlan = batadv_softif_vlan_get(bat_priv, vid);
3969         if (!vlan)
3970                 return false;
3971
3972         if (!atomic_read(&vlan->ap_isolation))
3973                 goto vlan_put;
3974
3975         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3976         if (!tt_local_entry)
3977                 goto vlan_put;
3978
3979         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3980         if (!tt_global_entry)
3981                 goto local_entry_put;
3982
3983         if (_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3984                 ret = true;
3985
3986         batadv_tt_global_entry_put(tt_global_entry);
3987 local_entry_put:
3988         batadv_tt_local_entry_put(tt_local_entry);
3989 vlan_put:
3990         batadv_softif_vlan_put(vlan);
3991         return ret;
3992 }
3993
3994 /**
3995  * batadv_tt_update_orig() - update global translation table with new tt
3996  *  information received via ogms
3997  * @bat_priv: the bat priv with all the soft interface information
3998  * @orig_node: the orig_node of the ogm
3999  * @tt_buff: pointer to the first tvlv VLAN entry
4000  * @tt_num_vlan: number of tvlv VLAN entries
4001  * @tt_change: pointer to the first entry in the TT buffer
4002  * @tt_num_changes: number of tt changes inside the tt buffer
4003  * @ttvn: translation table version number of this changeset
4004  */
4005 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
4006                                   struct batadv_orig_node *orig_node,
4007                                   const void *tt_buff, u16 tt_num_vlan,
4008                                   struct batadv_tvlv_tt_change *tt_change,
4009                                   u16 tt_num_changes, u8 ttvn)
4010 {
4011         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
4012         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4013         bool full_table = true;
4014         bool has_tt_init;
4015
4016         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
4017         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
4018                                &orig_node->capa_initialized);
4019
4020         /* orig table not initialised AND first diff is in the OGM OR the ttvn
4021          * increased by one -> we can apply the attached changes
4022          */
4023         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
4024                 /* the OGM could not contain the changes due to their size or
4025                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
4026                  * times.
4027                  * In this case send a tt request
4028                  */
4029                 if (!tt_num_changes) {
4030                         full_table = false;
4031                         goto request_table;
4032                 }
4033
4034                 spin_lock_bh(&orig_node->tt_lock);
4035
4036                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
4037                                          ttvn, tt_change);
4038
4039                 /* Even if we received the precomputed crc with the OGM, we
4040                  * prefer to recompute it to spot any possible inconsistency
4041                  * in the global table
4042                  */
4043                 batadv_tt_global_update_crc(bat_priv, orig_node);
4044
4045                 spin_unlock_bh(&orig_node->tt_lock);
4046
4047                 /* The ttvn alone is not enough to guarantee consistency
4048                  * because a single value could represent different states
4049                  * (due to the wrap around). Thus a node has to check whether
4050                  * the resulting table (after applying the changes) is still
4051                  * consistent or not. E.g. a node could disconnect while its
4052                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
4053                  * checking the CRC value is mandatory to detect the
4054                  * inconsistency
4055                  */
4056                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
4057                                                 tt_num_vlan))
4058                         goto request_table;
4059         } else {
4060                 /* if we missed more than one change or our tables are not
4061                  * in sync anymore -> request fresh tt data
4062                  */
4063                 if (!has_tt_init || ttvn != orig_ttvn ||
4064                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
4065                                                 tt_num_vlan)) {
4066 request_table:
4067                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4068                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
4069                                    orig_node->orig, ttvn, orig_ttvn,
4070                                    tt_num_changes);
4071                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
4072                                                tt_vlan, tt_num_vlan,
4073                                                full_table);
4074                         return;
4075                 }
4076         }
4077 }
4078
4079 /**
4080  * batadv_tt_global_client_is_roaming() - check if a client is marked as roaming
4081  * @bat_priv: the bat priv with all the soft interface information
4082  * @addr: the mac address of the client to check
4083  * @vid: VLAN identifier
4084  *
4085  * Return: true if we know that the client has moved from its old originator
4086  * to another one. This entry is still kept for consistency purposes and will be
4087  * deleted later by a DEL or because of timeout
4088  */
4089 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
4090                                         u8 *addr, unsigned short vid)
4091 {
4092         struct batadv_tt_global_entry *tt_global_entry;
4093         bool ret = false;
4094
4095         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
4096         if (!tt_global_entry)
4097                 goto out;
4098
4099         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4100         batadv_tt_global_entry_put(tt_global_entry);
4101 out:
4102         return ret;
4103 }
4104
4105 /**
4106  * batadv_tt_local_client_is_roaming() - tells whether the client is roaming
4107  * @bat_priv: the bat priv with all the soft interface information
4108  * @addr: the mac address of the local client to query
4109  * @vid: VLAN identifier
4110  *
4111  * Return: true if the local client is known to be roaming (it is not served by
4112  * this node anymore) or not. If yes, the client is still present in the table
4113  * to keep the latter consistent with the node TTVN
4114  */
4115 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
4116                                        u8 *addr, unsigned short vid)
4117 {
4118         struct batadv_tt_local_entry *tt_local_entry;
4119         bool ret = false;
4120
4121         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
4122         if (!tt_local_entry)
4123                 goto out;
4124
4125         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4126         batadv_tt_local_entry_put(tt_local_entry);
4127 out:
4128         return ret;
4129 }
4130
4131 /**
4132  * batadv_tt_add_temporary_global_entry() - Add temporary entry to global TT
4133  * @bat_priv: the bat priv with all the soft interface information
4134  * @orig_node: orig node which the temporary entry should be associated with
4135  * @addr: mac address of the client
4136  * @vid: VLAN id of the new temporary global translation table
4137  *
4138  * Return: true when temporary tt entry could be added, false otherwise
4139  */
4140 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
4141                                           struct batadv_orig_node *orig_node,
4142                                           const unsigned char *addr,
4143                                           unsigned short vid)
4144 {
4145         /* ignore loop detect macs, they are not supposed to be in the tt local
4146          * data as well.
4147          */
4148         if (batadv_bla_is_loopdetect_mac(addr))
4149                 return false;
4150
4151         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
4152                                   BATADV_TT_CLIENT_TEMP,
4153                                   atomic_read(&orig_node->last_ttvn)))
4154                 return false;
4155
4156         batadv_dbg(BATADV_DBG_TT, bat_priv,
4157                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
4158                    addr, batadv_print_vid(vid), orig_node->orig);
4159
4160         return true;
4161 }
4162
4163 /**
4164  * batadv_tt_local_resize_to_mtu() - resize the local translation table fit the
4165  *  maximum packet size that can be transported through the mesh
4166  * @soft_iface: netdev struct of the mesh interface
4167  *
4168  * Remove entries older than 'timeout' and half timeout if more entries need
4169  * to be removed.
4170  */
4171 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
4172 {
4173         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
4174         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
4175         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
4176         bool reduced = false;
4177
4178         spin_lock_bh(&bat_priv->tt.commit_lock);
4179
4180         while (true) {
4181                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
4182                 if (packet_size_max >= table_size)
4183                         break;
4184
4185                 batadv_tt_local_purge(bat_priv, timeout);
4186                 batadv_tt_local_purge_pending_clients(bat_priv);
4187
4188                 timeout /= 2;
4189                 reduced = true;
4190                 net_ratelimited_function(batadv_info, soft_iface,
4191                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
4192                                          packet_size_max);
4193         }
4194
4195         /* commit these changes immediately, to avoid synchronization problem
4196          * with the TTVN
4197          */
4198         if (reduced)
4199                 batadv_tt_local_commit_changes_nolock(bat_priv);
4200
4201         spin_unlock_bh(&bat_priv->tt.commit_lock);
4202 }
4203
4204 /**
4205  * batadv_tt_tvlv_ogm_handler_v1() - process incoming tt tvlv container
4206  * @bat_priv: the bat priv with all the soft interface information
4207  * @orig: the orig_node of the ogm
4208  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
4209  * @tvlv_value: tvlv buffer containing the gateway data
4210  * @tvlv_value_len: tvlv buffer length
4211  */
4212 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
4213                                           struct batadv_orig_node *orig,
4214                                           u8 flags, void *tvlv_value,
4215                                           u16 tvlv_value_len)
4216 {
4217         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4218         struct batadv_tvlv_tt_change *tt_change;
4219         struct batadv_tvlv_tt_data *tt_data;
4220         u16 num_entries, num_vlan;
4221
4222         if (tvlv_value_len < sizeof(*tt_data))
4223                 return;
4224
4225         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4226         tvlv_value_len -= sizeof(*tt_data);
4227
4228         num_vlan = ntohs(tt_data->num_vlan);
4229
4230         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
4231                 return;
4232
4233         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
4234         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
4235         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
4236
4237         num_entries = batadv_tt_entries(tvlv_value_len);
4238
4239         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
4240                               num_entries, tt_data->ttvn);
4241 }
4242
4243 /**
4244  * batadv_tt_tvlv_unicast_handler_v1() - process incoming (unicast) tt tvlv
4245  *  container
4246  * @bat_priv: the bat priv with all the soft interface information
4247  * @src: mac address of tt tvlv sender
4248  * @dst: mac address of tt tvlv recipient
4249  * @tvlv_value: tvlv buffer containing the tt data
4250  * @tvlv_value_len: tvlv buffer length
4251  *
4252  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
4253  * otherwise.
4254  */
4255 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4256                                              u8 *src, u8 *dst,
4257                                              void *tvlv_value,
4258                                              u16 tvlv_value_len)
4259 {
4260         struct batadv_tvlv_tt_data *tt_data;
4261         u16 tt_vlan_len, tt_num_entries;
4262         char tt_flag;
4263         bool ret;
4264
4265         if (tvlv_value_len < sizeof(*tt_data))
4266                 return NET_RX_SUCCESS;
4267
4268         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4269         tvlv_value_len -= sizeof(*tt_data);
4270
4271         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
4272         tt_vlan_len *= ntohs(tt_data->num_vlan);
4273
4274         if (tvlv_value_len < tt_vlan_len)
4275                 return NET_RX_SUCCESS;
4276
4277         tvlv_value_len -= tt_vlan_len;
4278         tt_num_entries = batadv_tt_entries(tvlv_value_len);
4279
4280         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
4281         case BATADV_TT_REQUEST:
4282                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
4283
4284                 /* If this node cannot provide a TT response the tt_request is
4285                  * forwarded
4286                  */
4287                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
4288                 if (!ret) {
4289                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
4290                                 tt_flag = 'F';
4291                         else
4292                                 tt_flag = '.';
4293
4294                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4295                                    "Routing TT_REQUEST to %pM [%c]\n",
4296                                    dst, tt_flag);
4297                         /* tvlv API will re-route the packet */
4298                         return NET_RX_DROP;
4299                 }
4300                 break;
4301         case BATADV_TT_RESPONSE:
4302                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
4303
4304                 if (batadv_is_my_mac(bat_priv, dst)) {
4305                         batadv_handle_tt_response(bat_priv, tt_data,
4306                                                   src, tt_num_entries);
4307                         return NET_RX_SUCCESS;
4308                 }
4309
4310                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
4311                         tt_flag =  'F';
4312                 else
4313                         tt_flag = '.';
4314
4315                 batadv_dbg(BATADV_DBG_TT, bat_priv,
4316                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
4317
4318                 /* tvlv API will re-route the packet */
4319                 return NET_RX_DROP;
4320         }
4321
4322         return NET_RX_SUCCESS;
4323 }
4324
4325 /**
4326  * batadv_roam_tvlv_unicast_handler_v1() - process incoming tt roam tvlv
4327  *  container
4328  * @bat_priv: the bat priv with all the soft interface information
4329  * @src: mac address of tt tvlv sender
4330  * @dst: mac address of tt tvlv recipient
4331  * @tvlv_value: tvlv buffer containing the tt data
4332  * @tvlv_value_len: tvlv buffer length
4333  *
4334  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
4335  * otherwise.
4336  */
4337 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4338                                                u8 *src, u8 *dst,
4339                                                void *tvlv_value,
4340                                                u16 tvlv_value_len)
4341 {
4342         struct batadv_tvlv_roam_adv *roaming_adv;
4343         struct batadv_orig_node *orig_node = NULL;
4344
4345         /* If this node is not the intended recipient of the
4346          * roaming advertisement the packet is forwarded
4347          * (the tvlv API will re-route the packet).
4348          */
4349         if (!batadv_is_my_mac(bat_priv, dst))
4350                 return NET_RX_DROP;
4351
4352         if (tvlv_value_len < sizeof(*roaming_adv))
4353                 goto out;
4354
4355         orig_node = batadv_orig_hash_find(bat_priv, src);
4356         if (!orig_node)
4357                 goto out;
4358
4359         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
4360         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
4361
4362         batadv_dbg(BATADV_DBG_TT, bat_priv,
4363                    "Received ROAMING_ADV from %pM (client %pM)\n",
4364                    src, roaming_adv->client);
4365
4366         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
4367                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
4368                              atomic_read(&orig_node->last_ttvn) + 1);
4369
4370 out:
4371         if (orig_node)
4372                 batadv_orig_node_put(orig_node);
4373         return NET_RX_SUCCESS;
4374 }
4375
4376 /**
4377  * batadv_tt_init() - initialise the translation table internals
4378  * @bat_priv: the bat priv with all the soft interface information
4379  *
4380  * Return: 0 on success or negative error number in case of failure.
4381  */
4382 int batadv_tt_init(struct batadv_priv *bat_priv)
4383 {
4384         int ret;
4385
4386         /* synchronized flags must be remote */
4387         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
4388
4389         ret = batadv_tt_local_init(bat_priv);
4390         if (ret < 0)
4391                 return ret;
4392
4393         ret = batadv_tt_global_init(bat_priv);
4394         if (ret < 0)
4395                 return ret;
4396
4397         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
4398                                      batadv_tt_tvlv_unicast_handler_v1,
4399                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
4400
4401         batadv_tvlv_handler_register(bat_priv, NULL,
4402                                      batadv_roam_tvlv_unicast_handler_v1,
4403                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
4404
4405         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
4406         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
4407                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
4408
4409         return 1;
4410 }
4411
4412 /**
4413  * batadv_tt_global_is_isolated() - check if a client is marked as isolated
4414  * @bat_priv: the bat priv with all the soft interface information
4415  * @addr: the mac address of the client
4416  * @vid: the identifier of the VLAN where this client is connected
4417  *
4418  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
4419  * otherwise
4420  */
4421 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
4422                                   const u8 *addr, unsigned short vid)
4423 {
4424         struct batadv_tt_global_entry *tt;
4425         bool ret;
4426
4427         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
4428         if (!tt)
4429                 return false;
4430
4431         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
4432
4433         batadv_tt_global_entry_put(tt);
4434
4435         return ret;
4436 }
4437
4438 /**
4439  * batadv_tt_cache_init() - Initialize tt memory object cache
4440  *
4441  * Return: 0 on success or negative error number in case of failure.
4442  */
4443 int __init batadv_tt_cache_init(void)
4444 {
4445         size_t tl_size = sizeof(struct batadv_tt_local_entry);
4446         size_t tg_size = sizeof(struct batadv_tt_global_entry);
4447         size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
4448         size_t tt_change_size = sizeof(struct batadv_tt_change_node);
4449         size_t tt_req_size = sizeof(struct batadv_tt_req_node);
4450         size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);
4451
4452         batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
4453                                             SLAB_HWCACHE_ALIGN, NULL);
4454         if (!batadv_tl_cache)
4455                 return -ENOMEM;
4456
4457         batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
4458                                             SLAB_HWCACHE_ALIGN, NULL);
4459         if (!batadv_tg_cache)
4460                 goto err_tt_tl_destroy;
4461
4462         batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
4463                                                  tt_orig_size, 0,
4464                                                  SLAB_HWCACHE_ALIGN, NULL);
4465         if (!batadv_tt_orig_cache)
4466                 goto err_tt_tg_destroy;
4467
4468         batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
4469                                                    tt_change_size, 0,
4470                                                    SLAB_HWCACHE_ALIGN, NULL);
4471         if (!batadv_tt_change_cache)
4472                 goto err_tt_orig_destroy;
4473
4474         batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
4475                                                 tt_req_size, 0,
4476                                                 SLAB_HWCACHE_ALIGN, NULL);
4477         if (!batadv_tt_req_cache)
4478                 goto err_tt_change_destroy;
4479
4480         batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
4481                                                  tt_roam_size, 0,
4482                                                  SLAB_HWCACHE_ALIGN, NULL);
4483         if (!batadv_tt_roam_cache)
4484                 goto err_tt_req_destroy;
4485
4486         return 0;
4487
4488 err_tt_req_destroy:
4489         kmem_cache_destroy(batadv_tt_req_cache);
4490         batadv_tt_req_cache = NULL;
4491 err_tt_change_destroy:
4492         kmem_cache_destroy(batadv_tt_change_cache);
4493         batadv_tt_change_cache = NULL;
4494 err_tt_orig_destroy:
4495         kmem_cache_destroy(batadv_tt_orig_cache);
4496         batadv_tt_orig_cache = NULL;
4497 err_tt_tg_destroy:
4498         kmem_cache_destroy(batadv_tg_cache);
4499         batadv_tg_cache = NULL;
4500 err_tt_tl_destroy:
4501         kmem_cache_destroy(batadv_tl_cache);
4502         batadv_tl_cache = NULL;
4503
4504         return -ENOMEM;
4505 }
4506
4507 /**
4508  * batadv_tt_cache_destroy() - Destroy tt memory object cache
4509  */
4510 void batadv_tt_cache_destroy(void)
4511 {
4512         kmem_cache_destroy(batadv_tl_cache);
4513         kmem_cache_destroy(batadv_tg_cache);
4514         kmem_cache_destroy(batadv_tt_orig_cache);
4515         kmem_cache_destroy(batadv_tt_change_cache);
4516         kmem_cache_destroy(batadv_tt_req_cache);
4517         kmem_cache_destroy(batadv_tt_roam_cache);
4518 }