net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "translation-table.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/bitops.h>
  23 #include <linux/bug.h>
  24 #include <linux/byteorder/generic.h>
  25 #include <linux/compiler.h>
  26 #include <linux/crc32c.h>
  27 #include <linux/errno.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/fs.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/jhash.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/kernel.h>
  34 #include <linux/list.h>
  35 #include <linux/lockdep.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/rculist.h>
  38 #include <linux/rcupdate.h>
  39 #include <linux/seq_file.h>
  40 #include <linux/slab.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/stddef.h>
  43 #include <linux/string.h>
  44 #include <linux/workqueue.h>
  45 #include <net/net_namespace.h>
  46
  47 #include "bridge_loop_avoidance.h"
  48 #include "hard-interface.h"
  49 #include "hash.h"
  50 #include "multicast.h"
  51 #include "originator.h"
  52 #include "packet.h"
  53 #include "soft-interface.h"
  54
  55 /* hash class keys */
  56 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  57 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  58
  59 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
  60                                  unsigned short vid,
  61                                  struct batadv_orig_node *orig_node);
  62 static void batadv_tt_purge(struct work_struct *work);
  63 static void
  64 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  65 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  66                                  struct batadv_orig_node *orig_node,
  67                                  const unsigned char *addr,
  68                                  unsigned short vid, const char *message,
  69                                  bool roaming);
  70
  71 /* returns 1 if they are the same mac addr and vid */
  72 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  73 {
  74         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  75                                          hash_entry);
  76         const struct batadv_tt_common_entry *tt1 = data1;
  77         const struct batadv_tt_common_entry *tt2 = data2;
  78
  79         return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
  80 }
  81
  82 /**
  83  * batadv_choose_tt - return the index of the tt entry in the hash table
  84  * @data: pointer to the tt_common_entry object to map
  85  * @size: the size of the hash table
  86  *
  87  * Returns the hash index where the object represented by 'data' should be
  88  * stored at.
  89  */
  90 static inline u32 batadv_choose_tt(const void *data, u32 size)
  91 {
  92         struct batadv_tt_common_entry *tt;
  93         u32 hash = 0;
  94
  95         tt = (struct batadv_tt_common_entry *)data;
  96         hash = jhash(&tt->addr, ETH_ALEN, hash);
  97         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
  98
  99         return hash % size;
 100 }
 101
 102 /**
 103  * batadv_tt_hash_find - look for a client in the given hash table
 104  * @hash: the hash table to search
 105  * @addr: the mac address of the client to look for
 106  * @vid: VLAN identifier
 107  *
 108  * Returns a pointer to the tt_common struct belonging to the searched client if
 109  * found, NULL otherwise.
 110  */
 111 static struct batadv_tt_common_entry *
 112 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
 113                     unsigned short vid)
 114 {
 115         struct hlist_head *head;
 116         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 117         u32 index;
 118
 119         if (!hash)
 120                 return NULL;
 121
 122         ether_addr_copy(to_search.addr, addr);
 123         to_search.vid = vid;
 124
 125         index = batadv_choose_tt(&to_search, hash->size);
 126         head = &hash->table[index];
 127
 128         rcu_read_lock();
 129         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 130                 if (!batadv_compare_eth(tt, addr))
 131                         continue;
 132
 133                 if (tt->vid != vid)
 134                         continue;
 135
 136                 if (!atomic_inc_not_zero(&tt->refcount))
 137                         continue;
 138
 139                 tt_tmp = tt;
 140                 break;
 141         }
 142         rcu_read_unlock();
 143
 144         return tt_tmp;
 145 }
 146
 147 /**
 148  * batadv_tt_local_hash_find - search the local table for a given client
 149  * @bat_priv: the bat priv with all the soft interface information
 150  * @addr: the mac address of the client to look for
 151  * @vid: VLAN identifier
 152  *
 153  * Returns a pointer to the corresponding tt_local_entry struct if the client is
 154  * found, NULL otherwise.
 155  */
 156 static struct batadv_tt_local_entry *
 157 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 158                           unsigned short vid)
 159 {
 160         struct batadv_tt_common_entry *tt_common_entry;
 161         struct batadv_tt_local_entry *tt_local_entry = NULL;
 162
 163         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 164                                               vid);
 165         if (tt_common_entry)
 166                 tt_local_entry = container_of(tt_common_entry,
 167                                               struct batadv_tt_local_entry,
 168                                               common);
 169         return tt_local_entry;
 170 }
 171
 172 /**
 173  * batadv_tt_global_hash_find - search the global table for a given client
 174  * @bat_priv: the bat priv with all the soft interface information
 175  * @addr: the mac address of the client to look for
 176  * @vid: VLAN identifier
 177  *
 178  * Returns a pointer to the corresponding tt_global_entry struct if the client
 179  * is found, NULL otherwise.
 180  */
 181 static struct batadv_tt_global_entry *
 182 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 183                            unsigned short vid)
 184 {
 185         struct batadv_tt_common_entry *tt_common_entry;
 186         struct batadv_tt_global_entry *tt_global_entry = NULL;
 187
 188         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 189                                               vid);
 190         if (tt_common_entry)
 191                 tt_global_entry = container_of(tt_common_entry,
 192                                                struct batadv_tt_global_entry,
 193                                                common);
 194         return tt_global_entry;
 195 }
 196
 197 static void
 198 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 199 {
 200         if (atomic_dec_and_test(&tt_local_entry->common.refcount)) {
 201                 batadv_softif_vlan_free_ref(tt_local_entry->vlan);
 202
 203                 kfree_rcu(tt_local_entry, common.rcu);
 204         }
 205 }
 206
 207 /**
 208  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
 209  *  tt_global_entry and possibly free it
 210  * @tt_global_entry: the object to free
 211  */
 212 static void
 213 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 214 {
 215         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 216                 batadv_tt_global_del_orig_list(tt_global_entry);
 217                 kfree_rcu(tt_global_entry, common.rcu);
 218         }
 219 }
 220
 221 /**
 222  * batadv_tt_global_hash_count - count the number of orig entries
 223  * @hash: hash table containing the tt entries
 224  * @addr: the mac address of the client to count entries for
 225  * @vid: VLAN identifier
 226  *
 227  * Return the number of originators advertising the given address/data
 228  * (excluding ourself).
 229  */
 230 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
 231                                 const u8 *addr, unsigned short vid)
 232 {
 233         struct batadv_tt_global_entry *tt_global_entry;
 234         int count;
 235
 236         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 237         if (!tt_global_entry)
 238                 return 0;
 239
 240         count = atomic_read(&tt_global_entry->orig_list_count);
 241         batadv_tt_global_entry_free_ref(tt_global_entry);
 242
 243         return count;
 244 }
 245
 246 /**
 247  * batadv_tt_local_size_mod - change the size by v of the local table identified
 248  *  by vid
 249  * @bat_priv: the bat priv with all the soft interface information
 250  * @vid: the VLAN identifier of the sub-table to change
 251  * @v: the amount to sum to the local table size
 252  */
 253 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 254                                      unsigned short vid, int v)
 255 {
 256         struct batadv_softif_vlan *vlan;
 257
 258         vlan = batadv_softif_vlan_get(bat_priv, vid);
 259         if (!vlan)
 260                 return;
 261
 262         atomic_add(v, &vlan->tt.num_entries);
 263
 264         batadv_softif_vlan_free_ref(vlan);
 265 }
 266
 267 /**
 268  * batadv_tt_local_size_inc - increase by one the local table size for the given
 269  *  vid
 270  * @bat_priv: the bat priv with all the soft interface information
 271  * @vid: the VLAN identifier
 272  */
 273 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 274                                      unsigned short vid)
 275 {
 276         batadv_tt_local_size_mod(bat_priv, vid, 1);
 277 }
 278
 279 /**
 280  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 281  *  vid
 282  * @bat_priv: the bat priv with all the soft interface information
 283  * @vid: the VLAN identifier
 284  */
 285 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 286                                      unsigned short vid)
 287 {
 288         batadv_tt_local_size_mod(bat_priv, vid, -1);
 289 }
 290
 291 /**
 292  * batadv_tt_global_size_mod - change the size by v of the local table
 293  *  identified by vid
 294  * @bat_priv: the bat priv with all the soft interface information
 295  * @vid: the VLAN identifier
 296  * @v: the amount to sum to the global table size
 297  */
 298 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 299                                       unsigned short vid, int v)
 300 {
 301         struct batadv_orig_node_vlan *vlan;
 302
 303         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 304         if (!vlan)
 305                 return;
 306
 307         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 308                 spin_lock_bh(&orig_node->vlan_list_lock);
 309                 if (!hlist_unhashed(&vlan->list)) {
 310                         hlist_del_init_rcu(&vlan->list);
 311                         batadv_orig_node_vlan_free_ref(vlan);
 312                 }
 313                 spin_unlock_bh(&orig_node->vlan_list_lock);
 314         }
 315
 316         batadv_orig_node_vlan_free_ref(vlan);
 317 }
 318
 319 /**
 320  * batadv_tt_global_size_inc - increase by one the global table size for the
 321  *  given vid
 322  * @orig_node: the originator which global table size has to be decreased
 323  * @vid: the vlan identifier
 324  */
 325 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 326                                       unsigned short vid)
 327 {
 328         batadv_tt_global_size_mod(orig_node, vid, 1);
 329 }
 330
 331 /**
 332  * batadv_tt_global_size_dec - decrease by one the global table size for the
 333  *  given vid
 334  * @orig_node: the originator which global table size has to be decreased
 335  * @vid: the vlan identifier
 336  */
 337 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 338                                       unsigned short vid)
 339 {
 340         batadv_tt_global_size_mod(orig_node, vid, -1);
 341 }
 342
 343 /**
 344  * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
 345  *  queue for free after rcu grace period
 346  * @orig_entry: tt orig entry to be free'd
 347  */
 348 static void
 349 batadv_tt_orig_list_entry_release(struct batadv_tt_orig_list_entry *orig_entry)
 350 {
 351         batadv_orig_node_free_ref(orig_entry->orig_node);
 352         kfree_rcu(orig_entry, rcu);
 353 }
 354
 355 static void
 356 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 357 {
 358         if (!atomic_dec_and_test(&orig_entry->refcount))
 359                 return;
 360
 361         batadv_tt_orig_list_entry_release(orig_entry);
 362 }
 363
 364 /**
 365  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 366  * @bat_priv: the bat priv with all the soft interface information
 367  * @tt_local_entry: the TT entry involved in the event
 368  * @event_flags: flags to store in the event structure
 369  */
 370 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 371                                   struct batadv_tt_local_entry *tt_local_entry,
 372                                   u8 event_flags)
 373 {
 374         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 375         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 376         u8 flags = common->flags | event_flags;
 377         bool event_removed = false;
 378         bool del_op_requested, del_op_entry;
 379
 380         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 381         if (!tt_change_node)
 382                 return;
 383
 384         tt_change_node->change.flags = flags;
 385         memset(tt_change_node->change.reserved, 0,
 386                sizeof(tt_change_node->change.reserved));
 387         ether_addr_copy(tt_change_node->change.addr, common->addr);
 388         tt_change_node->change.vid = htons(common->vid);
 389
 390         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 391
 392         /* check for ADD+DEL or DEL+ADD events */
 393         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 394         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 395                                  list) {
 396                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 397                         continue;
 398
 399                 /* DEL+ADD in the same orig interval have no effect and can be
 400                  * removed to avoid silly behaviour on the receiver side. The
 401                  * other way around (ADD+DEL) can happen in case of roaming of
 402                  * a client still in the NEW state. Roaming of NEW clients is
 403                  * now possible due to automatically recognition of "temporary"
 404                  * clients
 405                  */
 406                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 407                 if (!del_op_requested && del_op_entry)
 408                         goto del;
 409                 if (del_op_requested && !del_op_entry)
 410                         goto del;
 411
 412                 /* this is a second add in the same originator interval. It
 413                  * means that flags have been changed: update them!
 414                  */
 415                 if (!del_op_requested && !del_op_entry)
 416                         entry->change.flags = flags;
 417
 418                 continue;
 419 del:
 420                 list_del(&entry->list);
 421                 kfree(entry);
 422                 kfree(tt_change_node);
 423                 event_removed = true;
 424                 goto unlock;
 425         }
 426
 427         /* track the change in the OGMinterval list */
 428         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 429
 430 unlock:
 431         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 432
 433         if (event_removed)
 434                 atomic_dec(&bat_priv->tt.local_changes);
 435         else
 436                 atomic_inc(&bat_priv->tt.local_changes);
 437 }
 438
 439 /**
 440  * batadv_tt_len - compute length in bytes of given number of tt changes
 441  * @changes_num: number of tt changes
 442  *
 443  * Returns computed length in bytes.
 444  */
 445 static int batadv_tt_len(int changes_num)
 446 {
 447         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 448 }
 449
 450 /**
 451  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 452  * @tt_len: available space
 453  *
 454  * Returns the number of entries.
 455  */
 456 static u16 batadv_tt_entries(u16 tt_len)
 457 {
 458         return tt_len / batadv_tt_len(1);
 459 }
 460
 461 /**
 462  * batadv_tt_local_table_transmit_size - calculates the local translation table
 463  *  size when transmitted over the air
 464  * @bat_priv: the bat priv with all the soft interface information
 465  *
 466  * Returns local translation table size in bytes.
 467  */
 468 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 469 {
 470         u16 num_vlan = 0;
 471         u16 tt_local_entries = 0;
 472         struct batadv_softif_vlan *vlan;
 473         int hdr_size;
 474
 475         rcu_read_lock();
 476         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 477                 num_vlan++;
 478                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 479         }
 480         rcu_read_unlock();
 481
 482         /* header size of tvlv encapsulated tt response payload */
 483         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 484         hdr_size += sizeof(struct batadv_tvlv_hdr);
 485         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 486         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 487
 488         return hdr_size + batadv_tt_len(tt_local_entries);
 489 }
 490
 491 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 492 {
 493         if (bat_priv->tt.local_hash)
 494                 return 0;
 495
 496         bat_priv->tt.local_hash = batadv_hash_new(1024);
 497
 498         if (!bat_priv->tt.local_hash)
 499                 return -ENOMEM;
 500
 501         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 502                                    &batadv_tt_local_hash_lock_class_key);
 503
 504         return 0;
 505 }
 506
 507 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 508                                   struct batadv_tt_global_entry *tt_global,
 509                                   const char *message)
 510 {
 511         struct batadv_tt_global_entry *tt_removed_entry;
 512         struct hlist_node *tt_removed_node;
 513
 514         batadv_dbg(BATADV_DBG_TT, bat_priv,
 515                    "Deleting global tt entry %pM (vid: %d): %s\n",
 516                    tt_global->common.addr,
 517                    BATADV_PRINT_VID(tt_global->common.vid), message);
 518
 519         tt_removed_node = batadv_hash_remove(bat_priv->tt.global_hash,
 520                                              batadv_compare_tt,
 521                                              batadv_choose_tt,
 522                                              &tt_global->common);
 523         if (!tt_removed_node)
 524                 return;
 525
 526         /* drop reference of remove hash entry */
 527         tt_removed_entry = hlist_entry(tt_removed_node,
 528                                        struct batadv_tt_global_entry,
 529                                        common.hash_entry);
 530         batadv_tt_global_entry_free_ref(tt_removed_entry);
 531 }
 532
 533 /**
 534  * batadv_tt_local_add - add a new client to the local table or update an
 535  *  existing client
 536  * @soft_iface: netdev struct of the mesh interface
 537  * @addr: the mac address of the client to add
 538  * @vid: VLAN identifier
 539  * @ifindex: index of the interface where the client is connected to (useful to
 540  *  identify wireless clients)
 541  * @mark: the value contained in the skb->mark field of the received packet (if
 542  *  any)
 543  *
 544  * Returns true if the client was successfully added, false otherwise.
 545  */
 546 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
 547                          unsigned short vid, int ifindex, u32 mark)
 548 {
 549         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 550         struct batadv_tt_local_entry *tt_local;
 551         struct batadv_tt_global_entry *tt_global = NULL;
 552         struct batadv_softif_vlan *vlan;
 553         struct net_device *in_dev = NULL;
 554         struct hlist_head *head;
 555         struct batadv_tt_orig_list_entry *orig_entry;
 556         int hash_added, table_size, packet_size_max;
 557         bool ret = false;
 558         bool roamed_back = false;
 559         u8 remote_flags;
 560         u32 match_mark;
 561
 562         if (ifindex != BATADV_NULL_IFINDEX)
 563                 in_dev = dev_get_by_index(&init_net, ifindex);
 564
 565         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 566
 567         if (!is_multicast_ether_addr(addr))
 568                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 569
 570         if (tt_local) {
 571                 tt_local->last_seen = jiffies;
 572                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 573                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 574                                    "Re-adding pending client %pM (vid: %d)\n",
 575                                    addr, BATADV_PRINT_VID(vid));
 576                         /* whatever the reason why the PENDING flag was set,
 577                          * this is a client which was enqueued to be removed in
 578                          * this orig_interval. Since it popped up again, the
 579                          * flag can be reset like it was never enqueued
 580                          */
 581                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 582                         goto add_event;
 583                 }
 584
 585                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 586                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 587                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 588                                    addr, BATADV_PRINT_VID(vid));
 589                         /* the ROAM flag is set because this client roamed away
 590                          * and the node got a roaming_advertisement message. Now
 591                          * that the client popped up again at its original
 592                          * location such flag can be unset
 593                          */
 594                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 595                         roamed_back = true;
 596                 }
 597                 goto check_roaming;
 598         }
 599
 600         /* Ignore the client if we cannot send it in a full table response. */
 601         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 602         table_size += batadv_tt_len(1);
 603         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 604         if (table_size > packet_size_max) {
 605                 net_ratelimited_function(batadv_info, soft_iface,
 606                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 607                                          table_size, packet_size_max, addr);
 608                 goto out;
 609         }
 610
 611         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
 612         if (!tt_local)
 613                 goto out;
 614
 615         /* increase the refcounter of the related vlan */
 616         vlan = batadv_softif_vlan_get(bat_priv, vid);
 617         if (!vlan) {
 618                 net_ratelimited_function(batadv_info, soft_iface,
 619                                          "adding TT local entry %pM to non-existent VLAN %d\n",
 620                                          addr, BATADV_PRINT_VID(vid));
 621                 kfree(tt_local);
 622                 tt_local = NULL;
 623                 goto out;
 624         }
 625
 626         batadv_dbg(BATADV_DBG_TT, bat_priv,
 627                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 628                    addr, BATADV_PRINT_VID(vid),
 629                    (u8)atomic_read(&bat_priv->tt.vn));
 630
 631         ether_addr_copy(tt_local->common.addr, addr);
 632         /* The local entry has to be marked as NEW to avoid to send it in
 633          * a full table response going out before the next ttvn increment
 634          * (consistency check)
 635          */
 636         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 637         tt_local->common.vid = vid;
 638         if (batadv_is_wifi_netdev(in_dev))
 639                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 640         atomic_set(&tt_local->common.refcount, 2);
 641         tt_local->last_seen = jiffies;
 642         tt_local->common.added_at = tt_local->last_seen;
 643
 644         /* the batman interface mac and multicast addresses should never be
 645          * purged
 646          */
 647         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
 648             is_multicast_ether_addr(addr))
 649                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 650
 651         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 652                                      batadv_choose_tt, &tt_local->common,
 653                                      &tt_local->common.hash_entry);
 654
 655         if (unlikely(hash_added != 0)) {
 656                 /* remove the reference for the hash */
 657                 batadv_tt_local_entry_free_ref(tt_local);
 658                 goto out;
 659         }
 660
 661 add_event:
 662         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 663
 664 check_roaming:
 665         /* Check whether it is a roaming, but don't do anything if the roaming
 666          * process has already been handled
 667          */
 668         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 669                 /* These node are probably going to update their tt table */
 670                 head = &tt_global->orig_list;
 671                 rcu_read_lock();
 672                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 673                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 674                                              tt_global->common.vid,
 675                                              orig_entry->orig_node);
 676                 }
 677                 rcu_read_unlock();
 678                 if (roamed_back) {
 679                         batadv_tt_global_free(bat_priv, tt_global,
 680                                               "Roaming canceled");
 681                         tt_global = NULL;
 682                 } else {
 683                         /* The global entry has to be marked as ROAMING and
 684                          * has to be kept for consistency purpose
 685                          */
 686                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 687                         tt_global->roam_at = jiffies;
 688                 }
 689         }
 690
 691         /* store the current remote flags before altering them. This helps
 692          * understanding is flags are changing or not
 693          */
 694         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 695
 696         if (batadv_is_wifi_netdev(in_dev))
 697                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 698         else
 699                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 700
 701         /* check the mark in the skb: if it's equal to the configured
 702          * isolation_mark, it means the packet is coming from an isolated
 703          * non-mesh client
 704          */
 705         match_mark = (mark & bat_priv->isolation_mark_mask);
 706         if (bat_priv->isolation_mark_mask &&
 707             match_mark == bat_priv->isolation_mark)
 708                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 709         else
 710                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 711
 712         /* if any "dynamic" flag has been modified, resend an ADD event for this
 713          * entry so that all the nodes can get the new flags
 714          */
 715         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 716                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 717
 718         ret = true;
 719 out:
 720         if (in_dev)
 721                 dev_put(in_dev);
 722         if (tt_local)
 723                 batadv_tt_local_entry_free_ref(tt_local);
 724         if (tt_global)
 725                 batadv_tt_global_entry_free_ref(tt_global);
 726         return ret;
 727 }
 728
 729 /**
 730  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 731  *  within a TT Response directed to another node
 732  * @orig_node: originator for which the TT data has to be prepared
 733  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 734  * @tt_change: uninitialised pointer to the address of the area where the TT
 735  *  changed can be stored
 736  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 737  *  function reserves the amount of space needed to send the entire global TT
 738  *  table. In case of success the value is updated with the real amount of
 739  *  reserved bytes
 740
 741  * Allocate the needed amount of memory for the entire TT TVLV and write its
 742  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 743  * objects, one per active VLAN served by the originator node.
 744  *
 745  * Return the size of the allocated buffer or 0 in case of failure.
 746  */
 747 static u16
 748 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 749                                    struct batadv_tvlv_tt_data **tt_data,
 750                                    struct batadv_tvlv_tt_change **tt_change,
 751                                    s32 *tt_len)
 752 {
 753         u16 num_vlan = 0;
 754         u16 num_entries = 0;
 755         u16 change_offset;
 756         u16 tvlv_len;
 757         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 758         struct batadv_orig_node_vlan *vlan;
 759         u8 *tt_change_ptr;
 760
 761         spin_lock_bh(&orig_node->vlan_list_lock);
 762         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 763                 num_vlan++;
 764                 num_entries += atomic_read(&vlan->tt.num_entries);
 765         }
 766
 767         change_offset = sizeof(**tt_data);
 768         change_offset += num_vlan * sizeof(*tt_vlan);
 769
 770         /* if tt_len is negative, allocate the space needed by the full table */
 771         if (*tt_len < 0)
 772                 *tt_len = batadv_tt_len(num_entries);
 773
 774         tvlv_len = *tt_len;
 775         tvlv_len += change_offset;
 776
 777         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 778         if (!*tt_data) {
 779                 *tt_len = 0;
 780                 goto out;
 781         }
 782
 783         (*tt_data)->flags = BATADV_NO_FLAGS;
 784         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 785         (*tt_data)->num_vlan = htons(num_vlan);
 786
 787         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 788         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 789                 tt_vlan->vid = htons(vlan->vid);
 790                 tt_vlan->crc = htonl(vlan->tt.crc);
 791
 792                 tt_vlan++;
 793         }
 794
 795         tt_change_ptr = (u8 *)*tt_data + change_offset;
 796         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 797
 798 out:
 799         spin_unlock_bh(&orig_node->vlan_list_lock);
 800         return tvlv_len;
 801 }
 802
 803 /**
 804  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 805  *  node
 806  * @bat_priv: the bat priv with all the soft interface information
 807  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 808  * @tt_change: uninitialised pointer to the address of the area where the TT
 809  *  changes can be stored
 810  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 811  *  function reserves the amount of space needed to send the entire local TT
 812  *  table. In case of success the value is updated with the real amount of
 813  *  reserved bytes
 814  *
 815  * Allocate the needed amount of memory for the entire TT TVLV and write its
 816  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 817  * objects, one per active VLAN.
 818  *
 819  * Return the size of the allocated buffer or 0 in case of failure.
 820  */
 821 static u16
 822 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 823                                   struct batadv_tvlv_tt_data **tt_data,
 824                                   struct batadv_tvlv_tt_change **tt_change,
 825                                   s32 *tt_len)
 826 {
 827         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 828         struct batadv_softif_vlan *vlan;
 829         u16 num_vlan = 0;
 830         u16 vlan_entries = 0;
 831         u16 total_entries = 0;
 832         u16 tvlv_len;
 833         u8 *tt_change_ptr;
 834         int change_offset;
 835
 836         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
 837         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 838                 vlan_entries = atomic_read(&vlan->tt.num_entries);
 839                 if (vlan_entries < 1)
 840                         continue;
 841
 842                 num_vlan++;
 843                 total_entries += vlan_entries;
 844         }
 845
 846         change_offset = sizeof(**tt_data);
 847         change_offset += num_vlan * sizeof(*tt_vlan);
 848
 849         /* if tt_len is negative, allocate the space needed by the full table */
 850         if (*tt_len < 0)
 851                 *tt_len = batadv_tt_len(total_entries);
 852
 853         tvlv_len = *tt_len;
 854         tvlv_len += change_offset;
 855
 856         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 857         if (!*tt_data) {
 858                 tvlv_len = 0;
 859                 goto out;
 860         }
 861
 862         (*tt_data)->flags = BATADV_NO_FLAGS;
 863         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 864         (*tt_data)->num_vlan = htons(num_vlan);
 865
 866         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 867         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 868                 vlan_entries = atomic_read(&vlan->tt.num_entries);
 869                 if (vlan_entries < 1)
 870                         continue;
 871
 872                 tt_vlan->vid = htons(vlan->vid);
 873                 tt_vlan->crc = htonl(vlan->tt.crc);
 874                 tt_vlan->reserved = 0;
 875
 876                 tt_vlan++;
 877         }
 878
 879         tt_change_ptr = (u8 *)*tt_data + change_offset;
 880         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 881
 882 out:
 883         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
 884         return tvlv_len;
 885 }
 886
 887 /**
 888  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 889  *  after local tt changes have been committed
 890  * @bat_priv: the bat priv with all the soft interface information
 891  */
 892 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 893 {
 894         struct batadv_tt_change_node *entry, *safe;
 895         struct batadv_tvlv_tt_data *tt_data;
 896         struct batadv_tvlv_tt_change *tt_change;
 897         int tt_diff_len, tt_change_len = 0;
 898         int tt_diff_entries_num = 0;
 899         int tt_diff_entries_count = 0;
 900         u16 tvlv_len;
 901
 902         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 903         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 904
 905         /* if we have too many changes for one packet don't send any
 906          * and wait for the tt table request which will be fragmented
 907          */
 908         if (tt_diff_len > bat_priv->soft_iface->mtu)
 909                 tt_diff_len = 0;
 910
 911         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 912                                                      &tt_change, &tt_diff_len);
 913         if (!tvlv_len)
 914                 return;
 915
 916         tt_data->flags = BATADV_TT_OGM_DIFF;
 917
 918         if (tt_diff_len == 0)
 919                 goto container_register;
 920
 921         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 922         atomic_set(&bat_priv->tt.local_changes, 0);
 923
 924         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 925                                  list) {
 926                 if (tt_diff_entries_count < tt_diff_entries_num) {
 927                         memcpy(tt_change + tt_diff_entries_count,
 928                                &entry->change,
 929                                sizeof(struct batadv_tvlv_tt_change));
 930                         tt_diff_entries_count++;
 931                 }
 932                 list_del(&entry->list);
 933                 kfree(entry);
 934         }
 935         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 936
 937         /* Keep the buffer for possible tt_request */
 938         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 939         kfree(bat_priv->tt.last_changeset);
 940         bat_priv->tt.last_changeset_len = 0;
 941         bat_priv->tt.last_changeset = NULL;
 942         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 943         /* check whether this new OGM has no changes due to size problems */
 944         if (tt_diff_entries_count > 0) {
 945                 /* if kmalloc() fails we will reply with the full table
 946                  * instead of providing the diff
 947                  */
 948                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 949                 if (bat_priv->tt.last_changeset) {
 950                         memcpy(bat_priv->tt.last_changeset,
 951                                tt_change, tt_change_len);
 952                         bat_priv->tt.last_changeset_len = tt_diff_len;
 953                 }
 954         }
 955         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 956
 957 container_register:
 958         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 959                                        tvlv_len);
 960         kfree(tt_data);
 961 }
 962
 963 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 964 {
 965         struct net_device *net_dev = (struct net_device *)seq->private;
 966         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 967         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 968         struct batadv_tt_common_entry *tt_common_entry;
 969         struct batadv_tt_local_entry *tt_local;
 970         struct batadv_hard_iface *primary_if;
 971         struct hlist_head *head;
 972         unsigned short vid;
 973         u32 i;
 974         int last_seen_secs;
 975         int last_seen_msecs;
 976         unsigned long last_seen_jiffies;
 977         bool no_purge;
 978         u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
 979
 980         primary_if = batadv_seq_print_text_primary_if_get(seq);
 981         if (!primary_if)
 982                 goto out;
 983
 984         seq_printf(seq,
 985                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 986                    net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
 987         seq_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
 988                    "Flags", "Last seen", "CRC");
 989
 990         for (i = 0; i < hash->size; i++) {
 991                 head = &hash->table[i];
 992
 993                 rcu_read_lock();
 994                 hlist_for_each_entry_rcu(tt_common_entry,
 995                                          head, hash_entry) {
 996                         tt_local = container_of(tt_common_entry,
 997                                                 struct batadv_tt_local_entry,
 998                                                 common);
 999                         vid = tt_common_entry->vid;
1000                         last_seen_jiffies = jiffies - tt_local->last_seen;
1001                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1002                         last_seen_secs = last_seen_msecs / 1000;
1003                         last_seen_msecs = last_seen_msecs % 1000;
1004
1005                         no_purge = tt_common_entry->flags & np_flag;
1006
1007                         seq_printf(seq,
1008                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
1009                                    tt_common_entry->addr,
1010                                    BATADV_PRINT_VID(tt_common_entry->vid),
1011                                    ((tt_common_entry->flags &
1012                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1013                                    no_purge ? 'P' : '.',
1014                                    ((tt_common_entry->flags &
1015                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1016                                    ((tt_common_entry->flags &
1017                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1018                                    ((tt_common_entry->flags &
1019                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1020                                    ((tt_common_entry->flags &
1021                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1022                                    no_purge ? 0 : last_seen_secs,
1023                                    no_purge ? 0 : last_seen_msecs,
1024                                    tt_local->vlan->tt.crc);
1025                 }
1026                 rcu_read_unlock();
1027         }
1028 out:
1029         if (primary_if)
1030                 batadv_hardif_free_ref(primary_if);
1031         return 0;
1032 }
1033
1034 static void
1035 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1036                             struct batadv_tt_local_entry *tt_local_entry,
1037                             u16 flags, const char *message)
1038 {
1039         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1040
1041         /* The local client has to be marked as "pending to be removed" but has
1042          * to be kept in the table in order to send it in a full table
1043          * response issued before the net ttvn increment (consistency check)
1044          */
1045         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1046
1047         batadv_dbg(BATADV_DBG_TT, bat_priv,
1048                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1049                    tt_local_entry->common.addr,
1050                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1051 }
1052
1053 /**
1054  * batadv_tt_local_remove - logically remove an entry from the local table
1055  * @bat_priv: the bat priv with all the soft interface information
1056  * @addr: the MAC address of the client to remove
1057  * @vid: VLAN identifier
1058  * @message: message to append to the log on deletion
1059  * @roaming: true if the deletion is due to a roaming event
1060  *
1061  * Returns the flags assigned to the local entry before being deleted
1062  */
1063 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1064                            unsigned short vid, const char *message,
1065                            bool roaming)
1066 {
1067         struct batadv_tt_local_entry *tt_removed_entry;
1068         struct batadv_tt_local_entry *tt_local_entry;
1069         u16 flags, curr_flags = BATADV_NO_FLAGS;
1070         struct hlist_node *tt_removed_node;
1071
1072         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1073         if (!tt_local_entry)
1074                 goto out;
1075
1076         curr_flags = tt_local_entry->common.flags;
1077
1078         flags = BATADV_TT_CLIENT_DEL;
1079         /* if this global entry addition is due to a roaming, the node has to
1080          * mark the local entry as "roamed" in order to correctly reroute
1081          * packets later
1082          */
1083         if (roaming) {
1084                 flags |= BATADV_TT_CLIENT_ROAM;
1085                 /* mark the local client as ROAMed */
1086                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1087         }
1088
1089         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1090                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1091                                             message);
1092                 goto out;
1093         }
1094         /* if this client has been added right now, it is possible to
1095          * immediately purge it
1096          */
1097         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1098
1099         tt_removed_node = batadv_hash_remove(bat_priv->tt.local_hash,
1100                                              batadv_compare_tt,
1101                                              batadv_choose_tt,
1102                                              &tt_local_entry->common);
1103         if (!tt_removed_node)
1104                 goto out;
1105
1106         /* drop reference of remove hash entry */
1107         tt_removed_entry = hlist_entry(tt_removed_node,
1108                                        struct batadv_tt_local_entry,
1109                                        common.hash_entry);
1110         batadv_tt_local_entry_free_ref(tt_removed_entry);
1111
1112 out:
1113         if (tt_local_entry)
1114                 batadv_tt_local_entry_free_ref(tt_local_entry);
1115
1116         return curr_flags;
1117 }
1118
1119 /**
1120  * batadv_tt_local_purge_list - purge inactive tt local entries
1121  * @bat_priv: the bat priv with all the soft interface information
1122  * @head: pointer to the list containing the local tt entries
1123  * @timeout: parameter deciding whether a given tt local entry is considered
1124  *  inactive or not
1125  */
1126 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1127                                        struct hlist_head *head,
1128                                        int timeout)
1129 {
1130         struct batadv_tt_local_entry *tt_local_entry;
1131         struct batadv_tt_common_entry *tt_common_entry;
1132         struct hlist_node *node_tmp;
1133
1134         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1135                                   hash_entry) {
1136                 tt_local_entry = container_of(tt_common_entry,
1137                                               struct batadv_tt_local_entry,
1138                                               common);
1139                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1140                         continue;
1141
1142                 /* entry already marked for deletion */
1143                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1144                         continue;
1145
1146                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1147                         continue;
1148
1149                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1150                                             BATADV_TT_CLIENT_DEL, "timed out");
1151         }
1152 }
1153
1154 /**
1155  * batadv_tt_local_purge - purge inactive tt local entries
1156  * @bat_priv: the bat priv with all the soft interface information
1157  * @timeout: parameter deciding whether a given tt local entry is considered
1158  *  inactive or not
1159  */
1160 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1161                                   int timeout)
1162 {
1163         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1164         struct hlist_head *head;
1165         spinlock_t *list_lock; /* protects write access to the hash lists */
1166         u32 i;
1167
1168         for (i = 0; i < hash->size; i++) {
1169                 head = &hash->table[i];
1170                 list_lock = &hash->list_locks[i];
1171
1172                 spin_lock_bh(list_lock);
1173                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1174                 spin_unlock_bh(list_lock);
1175         }
1176 }
1177
1178 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1179 {
1180         struct batadv_hashtable *hash;
1181         spinlock_t *list_lock; /* protects write access to the hash lists */
1182         struct batadv_tt_common_entry *tt_common_entry;
1183         struct batadv_tt_local_entry *tt_local;
1184         struct hlist_node *node_tmp;
1185         struct hlist_head *head;
1186         u32 i;
1187
1188         if (!bat_priv->tt.local_hash)
1189                 return;
1190
1191         hash = bat_priv->tt.local_hash;
1192
1193         for (i = 0; i < hash->size; i++) {
1194                 head = &hash->table[i];
1195                 list_lock = &hash->list_locks[i];
1196
1197                 spin_lock_bh(list_lock);
1198                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1199                                           head, hash_entry) {
1200                         hlist_del_rcu(&tt_common_entry->hash_entry);
1201                         tt_local = container_of(tt_common_entry,
1202                                                 struct batadv_tt_local_entry,
1203                                                 common);
1204
1205                         batadv_tt_local_entry_free_ref(tt_local);
1206                 }
1207                 spin_unlock_bh(list_lock);
1208         }
1209
1210         batadv_hash_destroy(hash);
1211
1212         bat_priv->tt.local_hash = NULL;
1213 }
1214
1215 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1216 {
1217         if (bat_priv->tt.global_hash)
1218                 return 0;
1219
1220         bat_priv->tt.global_hash = batadv_hash_new(1024);
1221
1222         if (!bat_priv->tt.global_hash)
1223                 return -ENOMEM;
1224
1225         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1226                                    &batadv_tt_global_hash_lock_class_key);
1227
1228         return 0;
1229 }
1230
1231 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1232 {
1233         struct batadv_tt_change_node *entry, *safe;
1234
1235         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1236
1237         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1238                                  list) {
1239                 list_del(&entry->list);
1240                 kfree(entry);
1241         }
1242
1243         atomic_set(&bat_priv->tt.local_changes, 0);
1244         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1245 }
1246
1247 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1248  * batadv_tt_global_entry list
1249  *
1250  * returns it with an increased refcounter, NULL if not found
1251  */
1252 static struct batadv_tt_orig_list_entry *
1253 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1254                                  const struct batadv_orig_node *orig_node)
1255 {
1256         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1257         const struct hlist_head *head;
1258
1259         rcu_read_lock();
1260         head = &entry->orig_list;
1261         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1262                 if (tmp_orig_entry->orig_node != orig_node)
1263                         continue;
1264                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1265                         continue;
1266
1267                 orig_entry = tmp_orig_entry;
1268                 break;
1269         }
1270         rcu_read_unlock();
1271
1272         return orig_entry;
1273 }
1274
1275 /* find out if an orig_node is already in the list of a tt_global_entry.
1276  * returns true if found, false otherwise
1277  */
1278 static bool
1279 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1280                                 const struct batadv_orig_node *orig_node,
1281                                 u8 *flags)
1282 {
1283         struct batadv_tt_orig_list_entry *orig_entry;
1284         bool found = false;
1285
1286         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1287         if (orig_entry) {
1288                 found = true;
1289
1290                 if (flags)
1291                         *flags = orig_entry->flags;
1292
1293                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1294         }
1295
1296         return found;
1297 }
1298
1299 /**
1300  * batadv_tt_global_sync_flags - update TT sync flags
1301  * @tt_global: the TT global entry to update sync flags in
1302  *
1303  * Updates the sync flag bits in the tt_global flag attribute with a logical
1304  * OR of all sync flags from any of its TT orig entries.
1305  */
1306 static void
1307 batadv_tt_global_sync_flags(struct batadv_tt_global_entry *tt_global)
1308 {
1309         struct batadv_tt_orig_list_entry *orig_entry;
1310         const struct hlist_head *head;
1311         u16 flags = BATADV_NO_FLAGS;
1312
1313         rcu_read_lock();
1314         head = &tt_global->orig_list;
1315         hlist_for_each_entry_rcu(orig_entry, head, list)
1316                 flags |= orig_entry->flags;
1317         rcu_read_unlock();
1318
1319         flags |= tt_global->common.flags & (~BATADV_TT_SYNC_MASK);
1320         tt_global->common.flags = flags;
1321 }
1322
1323 /**
1324  * batadv_tt_global_orig_entry_add - add or update a TT orig entry
1325  * @tt_global: the TT global entry to add an orig entry in
1326  * @orig_node: the originator to add an orig entry for
1327  * @ttvn: translation table version number of this changeset
1328  * @flags: TT sync flags
1329  */
1330 static void
1331 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1332                                 struct batadv_orig_node *orig_node, int ttvn,
1333                                 u8 flags)
1334 {
1335         struct batadv_tt_orig_list_entry *orig_entry;
1336
1337         spin_lock_bh(&tt_global->list_lock);
1338
1339         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1340         if (orig_entry) {
1341                 /* refresh the ttvn: the current value could be a bogus one that
1342                  * was added during a "temporary client detection"
1343                  */
1344                 orig_entry->ttvn = ttvn;
1345                 orig_entry->flags = flags;
1346                 goto sync_flags;
1347         }
1348
1349         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1350         if (!orig_entry)
1351                 goto out;
1352
1353         INIT_HLIST_NODE(&orig_entry->list);
1354         atomic_inc(&orig_node->refcount);
1355         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1356         orig_entry->orig_node = orig_node;
1357         orig_entry->ttvn = ttvn;
1358         orig_entry->flags = flags;
1359         atomic_set(&orig_entry->refcount, 2);
1360
1361         hlist_add_head_rcu(&orig_entry->list,
1362                            &tt_global->orig_list);
1363         atomic_inc(&tt_global->orig_list_count);
1364
1365 sync_flags:
1366         batadv_tt_global_sync_flags(tt_global);
1367 out:
1368         if (orig_entry)
1369                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1370
1371         spin_unlock_bh(&tt_global->list_lock);
1372 }
1373
1374 /**
1375  * batadv_tt_global_add - add a new TT global entry or update an existing one
1376  * @bat_priv: the bat priv with all the soft interface information
1377  * @orig_node: the originator announcing the client
1378  * @tt_addr: the mac address of the non-mesh client
1379  * @vid: VLAN identifier
1380  * @flags: TT flags that have to be set for this non-mesh client
1381  * @ttvn: the tt version number ever announcing this non-mesh client
1382  *
1383  * Add a new TT global entry for the given originator. If the entry already
1384  * exists add a new reference to the given originator (a global entry can have
1385  * references to multiple originators) and adjust the flags attribute to reflect
1386  * the function argument.
1387  * If a TT local entry exists for this non-mesh client remove it.
1388  *
1389  * The caller must hold orig_node refcount.
1390  *
1391  * Return true if the new entry has been added, false otherwise
1392  */
1393 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1394                                  struct batadv_orig_node *orig_node,
1395                                  const unsigned char *tt_addr,
1396                                  unsigned short vid, u16 flags, u8 ttvn)
1397 {
1398         struct batadv_tt_global_entry *tt_global_entry;
1399         struct batadv_tt_local_entry *tt_local_entry;
1400         bool ret = false;
1401         int hash_added;
1402         struct batadv_tt_common_entry *common;
1403         u16 local_flags;
1404
1405         /* ignore global entries from backbone nodes */
1406         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1407                 return true;
1408
1409         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1410         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1411
1412         /* if the node already has a local client for this entry, it has to wait
1413          * for a roaming advertisement instead of manually messing up the global
1414          * table
1415          */
1416         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1417             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1418                 goto out;
1419
1420         if (!tt_global_entry) {
1421                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1422                 if (!tt_global_entry)
1423                         goto out;
1424
1425                 common = &tt_global_entry->common;
1426                 ether_addr_copy(common->addr, tt_addr);
1427                 common->vid = vid;
1428
1429                 if (!is_multicast_ether_addr(common->addr))
1430                         common->flags = flags & (~BATADV_TT_SYNC_MASK);
1431
1432                 tt_global_entry->roam_at = 0;
1433                 /* node must store current time in case of roaming. This is
1434                  * needed to purge this entry out on timeout (if nobody claims
1435                  * it)
1436                  */
1437                 if (flags & BATADV_TT_CLIENT_ROAM)
1438                         tt_global_entry->roam_at = jiffies;
1439                 atomic_set(&common->refcount, 2);
1440                 common->added_at = jiffies;
1441
1442                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1443                 atomic_set(&tt_global_entry->orig_list_count, 0);
1444                 spin_lock_init(&tt_global_entry->list_lock);
1445
1446                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1447                                              batadv_compare_tt,
1448                                              batadv_choose_tt, common,
1449                                              &common->hash_entry);
1450
1451                 if (unlikely(hash_added != 0)) {
1452                         /* remove the reference for the hash */
1453                         batadv_tt_global_entry_free_ref(tt_global_entry);
1454                         goto out_remove;
1455                 }
1456         } else {
1457                 common = &tt_global_entry->common;
1458                 /* If there is already a global entry, we can use this one for
1459                  * our processing.
1460                  * But if we are trying to add a temporary client then here are
1461                  * two options at this point:
1462                  * 1) the global client is not a temporary client: the global
1463                  *    client has to be left as it is, temporary information
1464                  *    should never override any already known client state
1465                  * 2) the global client is a temporary client: purge the
1466                  *    originator list and add the new one orig_entry
1467                  */
1468                 if (flags & BATADV_TT_CLIENT_TEMP) {
1469                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1470                                 goto out;
1471                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1472                                                             orig_node, NULL))
1473                                 goto out_remove;
1474                         batadv_tt_global_del_orig_list(tt_global_entry);
1475                         goto add_orig_entry;
1476                 }
1477
1478                 /* if the client was temporary added before receiving the first
1479                  * OGM announcing it, we have to clear the TEMP flag. Also,
1480                  * remove the previous temporary orig node and re-add it
1481                  * if required. If the orig entry changed, the new one which
1482                  * is a non-temporary entry is preferred.
1483                  */
1484                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1485                         batadv_tt_global_del_orig_list(tt_global_entry);
1486                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1487                 }
1488
1489                 /* the change can carry possible "attribute" flags like the
1490                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1491                  * client entry
1492                  */
1493                 if (!is_multicast_ether_addr(common->addr))
1494                         tt_global_entry->common.flags |= flags & (~BATADV_TT_SYNC_MASK);
1495
1496                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1497                  * one originator left in the list and we previously received a
1498                  * delete + roaming change for this originator.
1499                  *
1500                  * We should first delete the old originator before adding the
1501                  * new one.
1502                  */
1503                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1504                         batadv_tt_global_del_orig_list(tt_global_entry);
1505                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1506                         tt_global_entry->roam_at = 0;
1507                 }
1508         }
1509 add_orig_entry:
1510         /* add the new orig_entry (if needed) or update it */
1511         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn,
1512                                         flags & BATADV_TT_SYNC_MASK);
1513
1514         batadv_dbg(BATADV_DBG_TT, bat_priv,
1515                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1516                    common->addr, BATADV_PRINT_VID(common->vid),
1517                    orig_node->orig);
1518         ret = true;
1519
1520 out_remove:
1521         /* Do not remove multicast addresses from the local hash on
1522          * global additions
1523          */
1524         if (is_multicast_ether_addr(tt_addr))
1525                 goto out;
1526
1527         /* remove address from local hash if present */
1528         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1529                                              "global tt received",
1530                                              flags & BATADV_TT_CLIENT_ROAM);
1531         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1532
1533         if (!(flags & BATADV_TT_CLIENT_ROAM))
1534                 /* this is a normal global add. Therefore the client is not in a
1535                  * roaming state anymore.
1536                  */
1537                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1538
1539 out:
1540         if (tt_global_entry)
1541                 batadv_tt_global_entry_free_ref(tt_global_entry);
1542         if (tt_local_entry)
1543                 batadv_tt_local_entry_free_ref(tt_local_entry);
1544         return ret;
1545 }
1546
1547 /**
1548  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1549  * @bat_priv: the bat priv with all the soft interface information
1550  * @tt_global_entry: global translation table entry to be analyzed
1551  *
1552  * This functon assumes the caller holds rcu_read_lock().
1553  * Returns best originator list entry or NULL on errors.
1554  */
1555 static struct batadv_tt_orig_list_entry *
1556 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1557                             struct batadv_tt_global_entry *tt_global_entry)
1558 {
1559         struct batadv_neigh_node *router, *best_router = NULL;
1560         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1561         struct hlist_head *head;
1562         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1563
1564         head = &tt_global_entry->orig_list;
1565         hlist_for_each_entry_rcu(orig_entry, head, list) {
1566                 router = batadv_orig_router_get(orig_entry->orig_node,
1567                                                 BATADV_IF_DEFAULT);
1568                 if (!router)
1569                         continue;
1570
1571                 if (best_router &&
1572                     bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1573                                        best_router, BATADV_IF_DEFAULT) <= 0) {
1574                         batadv_neigh_node_free_ref(router);
1575                         continue;
1576                 }
1577
1578                 /* release the refcount for the "old" best */
1579                 if (best_router)
1580                         batadv_neigh_node_free_ref(best_router);
1581
1582                 best_entry = orig_entry;
1583                 best_router = router;
1584         }
1585
1586         if (best_router)
1587                 batadv_neigh_node_free_ref(best_router);
1588
1589         return best_entry;
1590 }
1591
1592 /**
1593  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1594  *  for this global entry
1595  * @bat_priv: the bat priv with all the soft interface information
1596  * @tt_global_entry: global translation table entry to be printed
1597  * @seq: debugfs table seq_file struct
1598  *
1599  * This functon assumes the caller holds rcu_read_lock().
1600  */
1601 static void
1602 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1603                              struct batadv_tt_global_entry *tt_global_entry,
1604                              struct seq_file *seq)
1605 {
1606         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1607         struct batadv_tt_common_entry *tt_common_entry;
1608         struct batadv_orig_node_vlan *vlan;
1609         struct hlist_head *head;
1610         u8 last_ttvn;
1611         u16 flags;
1612
1613         tt_common_entry = &tt_global_entry->common;
1614         flags = tt_common_entry->flags;
1615
1616         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1617         if (best_entry) {
1618                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1619                                                  tt_common_entry->vid);
1620                 if (!vlan) {
1621                         seq_printf(seq,
1622                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1623                                    BATADV_PRINT_VID(tt_common_entry->vid),
1624                                    best_entry->orig_node->orig);
1625                         goto print_list;
1626                 }
1627
1628                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1629                 seq_printf(seq,
1630                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1631                            '*', tt_global_entry->common.addr,
1632                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1633                            best_entry->ttvn, best_entry->orig_node->orig,
1634                            last_ttvn, vlan->tt.crc,
1635                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1636                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1637                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1638                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1639
1640                 batadv_orig_node_vlan_free_ref(vlan);
1641         }
1642
1643 print_list:
1644         head = &tt_global_entry->orig_list;
1645
1646         hlist_for_each_entry_rcu(orig_entry, head, list) {
1647                 if (best_entry == orig_entry)
1648                         continue;
1649
1650                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1651                                                  tt_common_entry->vid);
1652                 if (!vlan) {
1653                         seq_printf(seq,
1654                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1655                                    BATADV_PRINT_VID(tt_common_entry->vid),
1656                                    orig_entry->orig_node->orig);
1657                         continue;
1658                 }
1659
1660                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1661                 seq_printf(seq,
1662                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1663                            '+', tt_global_entry->common.addr,
1664                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1665                            orig_entry->ttvn, orig_entry->orig_node->orig,
1666                            last_ttvn, vlan->tt.crc,
1667                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1668                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1669                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1670                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1671
1672                 batadv_orig_node_vlan_free_ref(vlan);
1673         }
1674 }
1675
1676 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1677 {
1678         struct net_device *net_dev = (struct net_device *)seq->private;
1679         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1680         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1681         struct batadv_tt_common_entry *tt_common_entry;
1682         struct batadv_tt_global_entry *tt_global;
1683         struct batadv_hard_iface *primary_if;
1684         struct hlist_head *head;
1685         u32 i;
1686
1687         primary_if = batadv_seq_print_text_primary_if_get(seq);
1688         if (!primary_if)
1689                 goto out;
1690
1691         seq_printf(seq,
1692                    "Globally announced TT entries received via the mesh %s\n",
1693                    net_dev->name);
1694         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1695                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1696                    "CRC", "Flags");
1697
1698         for (i = 0; i < hash->size; i++) {
1699                 head = &hash->table[i];
1700
1701                 rcu_read_lock();
1702                 hlist_for_each_entry_rcu(tt_common_entry,
1703                                          head, hash_entry) {
1704                         tt_global = container_of(tt_common_entry,
1705                                                  struct batadv_tt_global_entry,
1706                                                  common);
1707                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1708                 }
1709                 rcu_read_unlock();
1710         }
1711 out:
1712         if (primary_if)
1713                 batadv_hardif_free_ref(primary_if);
1714         return 0;
1715 }
1716
1717 /**
1718  * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1719  * @tt_global_entry: the global entry to remove the orig_entry from
1720  * @orig_entry: the orig entry to remove and free
1721  *
1722  * Remove an orig_entry from its list in the given tt_global_entry and
1723  * free this orig_entry afterwards.
1724  *
1725  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1726  * part of a list.
1727  */
1728 static void
1729 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1730                                  struct batadv_tt_orig_list_entry *orig_entry)
1731 {
1732         lockdep_assert_held(&tt_global_entry->list_lock);
1733
1734         batadv_tt_global_size_dec(orig_entry->orig_node,
1735                                   tt_global_entry->common.vid);
1736         atomic_dec(&tt_global_entry->orig_list_count);
1737         /* requires holding tt_global_entry->list_lock and orig_entry->list
1738          * being part of a list
1739          */
1740         hlist_del_rcu(&orig_entry->list);
1741         batadv_tt_orig_list_entry_free_ref(orig_entry);
1742 }
1743
1744 /* deletes the orig list of a tt_global_entry */
1745 static void
1746 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1747 {
1748         struct hlist_head *head;
1749         struct hlist_node *safe;
1750         struct batadv_tt_orig_list_entry *orig_entry;
1751
1752         spin_lock_bh(&tt_global_entry->list_lock);
1753         head = &tt_global_entry->orig_list;
1754         hlist_for_each_entry_safe(orig_entry, safe, head, list)
1755                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1756         spin_unlock_bh(&tt_global_entry->list_lock);
1757 }
1758
1759 /**
1760  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1761  * @bat_priv: the bat priv with all the soft interface information
1762  * @tt_global_entry: the global entry to remove the orig_node from
1763  * @orig_node: the originator announcing the client
1764  * @message: message to append to the log on deletion
1765  *
1766  * Remove the given orig_node and its according orig_entry from the given
1767  * global tt entry.
1768  */
1769 static void
1770 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1771                                struct batadv_tt_global_entry *tt_global_entry,
1772                                struct batadv_orig_node *orig_node,
1773                                const char *message)
1774 {
1775         struct hlist_head *head;
1776         struct hlist_node *safe;
1777         struct batadv_tt_orig_list_entry *orig_entry;
1778         unsigned short vid;
1779
1780         spin_lock_bh(&tt_global_entry->list_lock);
1781         head = &tt_global_entry->orig_list;
1782         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1783                 if (orig_entry->orig_node == orig_node) {
1784                         vid = tt_global_entry->common.vid;
1785                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1786                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1787                                    orig_node->orig,
1788                                    tt_global_entry->common.addr,
1789                                    BATADV_PRINT_VID(vid), message);
1790                         _batadv_tt_global_del_orig_entry(tt_global_entry,
1791                                                          orig_entry);
1792                 }
1793         }
1794         spin_unlock_bh(&tt_global_entry->list_lock);
1795 }
1796
1797 /* If the client is to be deleted, we check if it is the last origantor entry
1798  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1799  * timer, otherwise we simply remove the originator scheduled for deletion.
1800  */
1801 static void
1802 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1803                              struct batadv_tt_global_entry *tt_global_entry,
1804                              struct batadv_orig_node *orig_node,
1805                              const char *message)
1806 {
1807         bool last_entry = true;
1808         struct hlist_head *head;
1809         struct batadv_tt_orig_list_entry *orig_entry;
1810
1811         /* no local entry exists, case 1:
1812          * Check if this is the last one or if other entries exist.
1813          */
1814
1815         rcu_read_lock();
1816         head = &tt_global_entry->orig_list;
1817         hlist_for_each_entry_rcu(orig_entry, head, list) {
1818                 if (orig_entry->orig_node != orig_node) {
1819                         last_entry = false;
1820                         break;
1821                 }
1822         }
1823         rcu_read_unlock();
1824
1825         if (last_entry) {
1826                 /* its the last one, mark for roaming. */
1827                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1828                 tt_global_entry->roam_at = jiffies;
1829         } else
1830                 /* there is another entry, we can simply delete this
1831                  * one and can still use the other one.
1832                  */
1833                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1834                                                orig_node, message);
1835 }
1836
1837 /**
1838  * batadv_tt_global_del - remove a client from the global table
1839  * @bat_priv: the bat priv with all the soft interface information
1840  * @orig_node: an originator serving this client
1841  * @addr: the mac address of the client
1842  * @vid: VLAN identifier
1843  * @message: a message explaining the reason for deleting the client to print
1844  *  for debugging purpose
1845  * @roaming: true if the deletion has been triggered by a roaming event
1846  */
1847 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1848                                  struct batadv_orig_node *orig_node,
1849                                  const unsigned char *addr, unsigned short vid,
1850                                  const char *message, bool roaming)
1851 {
1852         struct batadv_tt_global_entry *tt_global_entry;
1853         struct batadv_tt_local_entry *local_entry = NULL;
1854
1855         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1856         if (!tt_global_entry)
1857                 goto out;
1858
1859         if (!roaming) {
1860                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1861                                                orig_node, message);
1862
1863                 if (hlist_empty(&tt_global_entry->orig_list))
1864                         batadv_tt_global_free(bat_priv, tt_global_entry,
1865                                               message);
1866
1867                 goto out;
1868         }
1869
1870         /* if we are deleting a global entry due to a roam
1871          * event, there are two possibilities:
1872          * 1) the client roamed from node A to node B => if there
1873          *    is only one originator left for this client, we mark
1874          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1875          *    wait for node B to claim it. In case of timeout
1876          *    the entry is purged.
1877          *
1878          *    If there are other originators left, we directly delete
1879          *    the originator.
1880          * 2) the client roamed to us => we can directly delete
1881          *    the global entry, since it is useless now.
1882          */
1883         local_entry = batadv_tt_local_hash_find(bat_priv,
1884                                                 tt_global_entry->common.addr,
1885                                                 vid);
1886         if (local_entry) {
1887                 /* local entry exists, case 2: client roamed to us. */
1888                 batadv_tt_global_del_orig_list(tt_global_entry);
1889                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1890         } else
1891                 /* no local entry exists, case 1: check for roaming */
1892                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1893                                              orig_node, message);
1894
1895 out:
1896         if (tt_global_entry)
1897                 batadv_tt_global_entry_free_ref(tt_global_entry);
1898         if (local_entry)
1899                 batadv_tt_local_entry_free_ref(local_entry);
1900 }
1901
1902 /**
1903  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1904  *  given originator matching the provided vid
1905  * @bat_priv: the bat priv with all the soft interface information
1906  * @orig_node: the originator owning the entries to remove
1907  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1908  *  removed
1909  * @message: debug message to print as "reason"
1910  */
1911 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1912                                struct batadv_orig_node *orig_node,
1913                                s32 match_vid,
1914                                const char *message)
1915 {
1916         struct batadv_tt_global_entry *tt_global;
1917         struct batadv_tt_common_entry *tt_common_entry;
1918         u32 i;
1919         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1920         struct hlist_node *safe;
1921         struct hlist_head *head;
1922         spinlock_t *list_lock; /* protects write access to the hash lists */
1923         unsigned short vid;
1924
1925         if (!hash)
1926                 return;
1927
1928         for (i = 0; i < hash->size; i++) {
1929                 head = &hash->table[i];
1930                 list_lock = &hash->list_locks[i];
1931
1932                 spin_lock_bh(list_lock);
1933                 hlist_for_each_entry_safe(tt_common_entry, safe,
1934                                           head, hash_entry) {
1935                         /* remove only matching entries */
1936                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1937                                 continue;
1938
1939                         tt_global = container_of(tt_common_entry,
1940                                                  struct batadv_tt_global_entry,
1941                                                  common);
1942
1943                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
1944                                                        orig_node, message);
1945
1946                         if (hlist_empty(&tt_global->orig_list)) {
1947                                 vid = tt_global->common.vid;
1948                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1949                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1950                                            tt_global->common.addr,
1951                                            BATADV_PRINT_VID(vid), message);
1952                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1953                                 batadv_tt_global_entry_free_ref(tt_global);
1954                         }
1955                 }
1956                 spin_unlock_bh(list_lock);
1957         }
1958         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1959 }
1960
1961 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1962                                       char **msg)
1963 {
1964         bool purge = false;
1965         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1966         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1967
1968         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1969             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1970                 purge = true;
1971                 *msg = "Roaming timeout\n";
1972         }
1973
1974         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1975             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1976                 purge = true;
1977                 *msg = "Temporary client timeout\n";
1978         }
1979
1980         return purge;
1981 }
1982
1983 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1984 {
1985         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1986         struct hlist_head *head;
1987         struct hlist_node *node_tmp;
1988         spinlock_t *list_lock; /* protects write access to the hash lists */
1989         u32 i;
1990         char *msg = NULL;
1991         struct batadv_tt_common_entry *tt_common;
1992         struct batadv_tt_global_entry *tt_global;
1993
1994         for (i = 0; i < hash->size; i++) {
1995                 head = &hash->table[i];
1996                 list_lock = &hash->list_locks[i];
1997
1998                 spin_lock_bh(list_lock);
1999                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2000                                           hash_entry) {
2001                         tt_global = container_of(tt_common,
2002                                                  struct batadv_tt_global_entry,
2003                                                  common);
2004
2005                         if (!batadv_tt_global_to_purge(tt_global, &msg))
2006                                 continue;
2007
2008                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2009                                    "Deleting global tt entry %pM (vid: %d): %s\n",
2010                                    tt_global->common.addr,
2011                                    BATADV_PRINT_VID(tt_global->common.vid),
2012                                    msg);
2013
2014                         hlist_del_rcu(&tt_common->hash_entry);
2015
2016                         batadv_tt_global_entry_free_ref(tt_global);
2017                 }
2018                 spin_unlock_bh(list_lock);
2019         }
2020 }
2021
2022 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2023 {
2024         struct batadv_hashtable *hash;
2025         spinlock_t *list_lock; /* protects write access to the hash lists */
2026         struct batadv_tt_common_entry *tt_common_entry;
2027         struct batadv_tt_global_entry *tt_global;
2028         struct hlist_node *node_tmp;
2029         struct hlist_head *head;
2030         u32 i;
2031
2032         if (!bat_priv->tt.global_hash)
2033                 return;
2034
2035         hash = bat_priv->tt.global_hash;
2036
2037         for (i = 0; i < hash->size; i++) {
2038                 head = &hash->table[i];
2039                 list_lock = &hash->list_locks[i];
2040
2041                 spin_lock_bh(list_lock);
2042                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2043                                           head, hash_entry) {
2044                         hlist_del_rcu(&tt_common_entry->hash_entry);
2045                         tt_global = container_of(tt_common_entry,
2046                                                  struct batadv_tt_global_entry,
2047                                                  common);
2048                         batadv_tt_global_entry_free_ref(tt_global);
2049                 }
2050                 spin_unlock_bh(list_lock);
2051         }
2052
2053         batadv_hash_destroy(hash);
2054
2055         bat_priv->tt.global_hash = NULL;
2056 }
2057
2058 static bool
2059 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2060                        struct batadv_tt_global_entry *tt_global_entry)
2061 {
2062         bool ret = false;
2063
2064         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2065             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2066                 ret = true;
2067
2068         /* check if the two clients are marked as isolated */
2069         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2070             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2071                 ret = true;
2072
2073         return ret;
2074 }
2075
2076 /**
2077  * batadv_transtable_search - get the mesh destination for a given client
2078  * @bat_priv: the bat priv with all the soft interface information
2079  * @src: mac address of the source client
2080  * @addr: mac address of the destination client
2081  * @vid: VLAN identifier
2082  *
2083  * Returns a pointer to the originator that was selected as destination in the
2084  * mesh for contacting the client 'addr', NULL otherwise.
2085  * In case of multiple originators serving the same client, the function returns
2086  * the best one (best in terms of metric towards the destination node).
2087  *
2088  * If the two clients are AP isolated the function returns NULL.
2089  */
2090 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2091                                                   const u8 *src,
2092                                                   const u8 *addr,
2093                                                   unsigned short vid)
2094 {
2095         struct batadv_tt_local_entry *tt_local_entry = NULL;
2096         struct batadv_tt_global_entry *tt_global_entry = NULL;
2097         struct batadv_orig_node *orig_node = NULL;
2098         struct batadv_tt_orig_list_entry *best_entry;
2099
2100         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2101                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2102                 if (!tt_local_entry ||
2103                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2104                         goto out;
2105         }
2106
2107         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2108         if (!tt_global_entry)
2109                 goto out;
2110
2111         /* check whether the clients should not communicate due to AP
2112          * isolation
2113          */
2114         if (tt_local_entry &&
2115             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2116                 goto out;
2117
2118         rcu_read_lock();
2119         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2120         /* found anything? */
2121         if (best_entry)
2122                 orig_node = best_entry->orig_node;
2123         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2124                 orig_node = NULL;
2125         rcu_read_unlock();
2126
2127 out:
2128         if (tt_global_entry)
2129                 batadv_tt_global_entry_free_ref(tt_global_entry);
2130         if (tt_local_entry)
2131                 batadv_tt_local_entry_free_ref(tt_local_entry);
2132
2133         return orig_node;
2134 }
2135
2136 /**
2137  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2138  *  to the given orig_node
2139  * @bat_priv: the bat priv with all the soft interface information
2140  * @orig_node: originator for which the CRC should be computed
2141  * @vid: VLAN identifier for which the CRC32 has to be computed
2142  *
2143  * This function computes the checksum for the global table corresponding to a
2144  * specific originator. In particular, the checksum is computed as follows: For
2145  * each client connected to the originator the CRC32C of the MAC address and the
2146  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2147  * together.
2148  *
2149  * The idea behind is that CRC32C should be used as much as possible in order to
2150  * produce a unique hash of the table, but since the order which is used to feed
2151  * the CRC32C function affects the result and since every node in the network
2152  * probably sorts the clients differently, the hash function cannot be directly
2153  * computed over the entire table. Hence the CRC32C is used only on
2154  * the single client entry, while all the results are then xor'ed together
2155  * because the XOR operation can combine them all while trying to reduce the
2156  * noise as much as possible.
2157  *
2158  * Returns the checksum of the global table of a given originator.
2159  */
2160 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2161                                 struct batadv_orig_node *orig_node,
2162                                 unsigned short vid)
2163 {
2164         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2165         struct batadv_tt_orig_list_entry *tt_orig;
2166         struct batadv_tt_common_entry *tt_common;
2167         struct batadv_tt_global_entry *tt_global;
2168         struct hlist_head *head;
2169         u32 i, crc_tmp, crc = 0;
2170         u8 flags;
2171         __be16 tmp_vid;
2172
2173         for (i = 0; i < hash->size; i++) {
2174                 head = &hash->table[i];
2175
2176                 rcu_read_lock();
2177                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2178                         tt_global = container_of(tt_common,
2179                                                  struct batadv_tt_global_entry,
2180                                                  common);
2181                         /* compute the CRC only for entries belonging to the
2182                          * VLAN identified by the vid passed as parameter
2183                          */
2184                         if (tt_common->vid != vid)
2185                                 continue;
2186
2187                         /* Roaming clients are in the global table for
2188                          * consistency only. They don't have to be
2189                          * taken into account while computing the
2190                          * global crc
2191                          */
2192                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2193                                 continue;
2194                         /* Temporary clients have not been announced yet, so
2195                          * they have to be skipped while computing the global
2196                          * crc
2197                          */
2198                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2199                                 continue;
2200
2201                         /* find out if this global entry is announced by this
2202                          * originator
2203                          */
2204                         tt_orig = batadv_tt_global_orig_entry_find(tt_global,
2205                                                                    orig_node);
2206                         if (!tt_orig)
2207                                 continue;
2208
2209                         /* use network order to read the VID: this ensures that
2210                          * every node reads the bytes in the same order.
2211                          */
2212                         tmp_vid = htons(tt_common->vid);
2213                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2214
2215                         /* compute the CRC on flags that have to be kept in sync
2216                          * among nodes
2217                          */
2218                         flags = tt_orig->flags;
2219                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2220
2221                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2222
2223                         batadv_tt_orig_list_entry_free_ref(tt_orig);
2224                 }
2225                 rcu_read_unlock();
2226         }
2227
2228         return crc;
2229 }
2230
2231 /**
2232  * batadv_tt_local_crc - calculates the checksum of the local table
2233  * @bat_priv: the bat priv with all the soft interface information
2234  * @vid: VLAN identifier for which the CRC32 has to be computed
2235  *
2236  * For details about the computation, please refer to the documentation for
2237  * batadv_tt_global_crc().
2238  *
2239  * Returns the checksum of the local table
2240  */
2241 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2242                                unsigned short vid)
2243 {
2244         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2245         struct batadv_tt_common_entry *tt_common;
2246         struct hlist_head *head;
2247         u32 i, crc_tmp, crc = 0;
2248         u8 flags;
2249         __be16 tmp_vid;
2250
2251         for (i = 0; i < hash->size; i++) {
2252                 head = &hash->table[i];
2253
2254                 rcu_read_lock();
2255                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2256                         /* compute the CRC only for entries belonging to the
2257                          * VLAN identified by vid
2258                          */
2259                         if (tt_common->vid != vid)
2260                                 continue;
2261
2262                         /* not yet committed clients have not to be taken into
2263                          * account while computing the CRC
2264                          */
2265                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2266                                 continue;
2267
2268                         /* use network order to read the VID: this ensures that
2269                          * every node reads the bytes in the same order.
2270                          */
2271                         tmp_vid = htons(tt_common->vid);
2272                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2273
2274                         /* compute the CRC on flags that have to be kept in sync
2275                          * among nodes
2276                          */
2277                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2278                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2279
2280                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2281                 }
2282                 rcu_read_unlock();
2283         }
2284
2285         return crc;
2286 }
2287
2288 /**
2289  * batadv_tt_req_node_release - free tt_req node entry
2290  * @ref: kref pointer of the tt req_node entry
2291  */
2292 static void batadv_tt_req_node_release(struct kref *ref)
2293 {
2294         struct batadv_tt_req_node *tt_req_node;
2295
2296         tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2297
2298         kfree(tt_req_node);
2299 }
2300
2301 /**
2302  * batadv_tt_req_node_put - decrement the tt_req_node refcounter and
2303  *  possibly release it
2304  * @tt_req_node: tt_req_node to be free'd
2305  */
2306 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2307 {
2308         kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2309 }
2310
2311 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2312 {
2313         struct batadv_tt_req_node *node;
2314         struct hlist_node *safe;
2315
2316         spin_lock_bh(&bat_priv->tt.req_list_lock);
2317
2318         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2319                 hlist_del_init(&node->list);
2320                 batadv_tt_req_node_put(node);
2321         }
2322
2323         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2324 }
2325
2326 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2327                                        struct batadv_orig_node *orig_node,
2328                                        const void *tt_buff,
2329                                        u16 tt_buff_len)
2330 {
2331         /* Replace the old buffer only if I received something in the
2332          * last OGM (the OGM could carry no changes)
2333          */
2334         spin_lock_bh(&orig_node->tt_buff_lock);
2335         if (tt_buff_len > 0) {
2336                 kfree(orig_node->tt_buff);
2337                 orig_node->tt_buff_len = 0;
2338                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2339                 if (orig_node->tt_buff) {
2340                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2341                         orig_node->tt_buff_len = tt_buff_len;
2342                 }
2343         }
2344         spin_unlock_bh(&orig_node->tt_buff_lock);
2345 }
2346
2347 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2348 {
2349         struct batadv_tt_req_node *node;
2350         struct hlist_node *safe;
2351
2352         spin_lock_bh(&bat_priv->tt.req_list_lock);
2353         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2354                 if (batadv_has_timed_out(node->issued_at,
2355                                          BATADV_TT_REQUEST_TIMEOUT)) {
2356                         hlist_del_init(&node->list);
2357                         batadv_tt_req_node_put(node);
2358                 }
2359         }
2360         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2361 }
2362
2363 /**
2364  * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2365  * @bat_priv: the bat priv with all the soft interface information
2366  * @orig_node: orig node this request is being issued for
2367  *
2368  * Returns the pointer to the new tt_req_node struct if no request
2369  * has already been issued for this orig_node, NULL otherwise.
2370  */
2371 static struct batadv_tt_req_node *
2372 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2373                        struct batadv_orig_node *orig_node)
2374 {
2375         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2376
2377         spin_lock_bh(&bat_priv->tt.req_list_lock);
2378         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2379                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2380                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2381                                           BATADV_TT_REQUEST_TIMEOUT))
2382                         goto unlock;
2383         }
2384
2385         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2386         if (!tt_req_node)
2387                 goto unlock;
2388
2389         kref_init(&tt_req_node->refcount);
2390         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2391         tt_req_node->issued_at = jiffies;
2392
2393         kref_get(&tt_req_node->refcount);
2394         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2395 unlock:
2396         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2397         return tt_req_node;
2398 }
2399
2400 /**
2401  * batadv_tt_local_valid - verify that given tt entry is a valid one
2402  * @entry_ptr: to be checked local tt entry
2403  * @data_ptr: not used but definition required to satisfy the callback prototype
2404  *
2405  * Returns 1 if the entry is a valid, 0 otherwise.
2406  */
2407 static int batadv_tt_local_valid(const void *entry_ptr,
2408                                  const void *data_ptr,
2409                                  u8 *flags)
2410 {
2411         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2412
2413         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2414                 return 0;
2415
2416         if (flags)
2417                 *flags = tt_common_entry->flags;
2418
2419         return 1;
2420 }
2421
2422 static int batadv_tt_global_valid(const void *entry_ptr,
2423                                   const void *data_ptr,
2424                                   u8 *flags)
2425 {
2426         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2427         const struct batadv_tt_global_entry *tt_global_entry;
2428         const struct batadv_orig_node *orig_node = data_ptr;
2429
2430         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2431             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2432                 return 0;
2433
2434         tt_global_entry = container_of(tt_common_entry,
2435                                        struct batadv_tt_global_entry,
2436                                        common);
2437
2438         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node,
2439                                                flags);
2440 }
2441
2442 /**
2443  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2444  *  specified tt hash
2445  * @bat_priv: the bat priv with all the soft interface information
2446  * @hash: hash table containing the tt entries
2447  * @tt_len: expected tvlv tt data buffer length in number of bytes
2448  * @tvlv_buff: pointer to the buffer to fill with the TT data
2449  * @valid_cb: function to filter tt change entries
2450  * @cb_data: data passed to the filter function as argument
2451  */
2452 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2453                                     struct batadv_hashtable *hash,
2454                                     void *tvlv_buff, u16 tt_len,
2455                                     int (*valid_cb)(const void *,
2456                                                     const void *,
2457                                                     u8 *flags),
2458                                     void *cb_data)
2459 {
2460         struct batadv_tt_common_entry *tt_common_entry;
2461         struct batadv_tvlv_tt_change *tt_change;
2462         struct hlist_head *head;
2463         u16 tt_tot, tt_num_entries = 0;
2464         u8 flags;
2465         bool ret;
2466         u32 i;
2467
2468         tt_tot = batadv_tt_entries(tt_len);
2469         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2470
2471         if (!valid_cb)
2472                 return;
2473
2474         rcu_read_lock();
2475         for (i = 0; i < hash->size; i++) {
2476                 head = &hash->table[i];
2477
2478                 hlist_for_each_entry_rcu(tt_common_entry,
2479                                          head, hash_entry) {
2480                         if (tt_tot == tt_num_entries)
2481                                 break;
2482
2483                         ret = valid_cb(tt_common_entry, cb_data, &flags);
2484                         if (!ret)
2485                                 continue;
2486
2487                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2488                         tt_change->flags = flags;
2489                         tt_change->vid = htons(tt_common_entry->vid);
2490                         memset(tt_change->reserved, 0,
2491                                sizeof(tt_change->reserved));
2492
2493                         tt_num_entries++;
2494                         tt_change++;
2495                 }
2496         }
2497         rcu_read_unlock();
2498 }
2499
2500 /**
2501  * batadv_tt_global_check_crc - check if all the CRCs are correct
2502  * @orig_node: originator for which the CRCs have to be checked
2503  * @tt_vlan: pointer to the first tvlv VLAN entry
2504  * @num_vlan: number of tvlv VLAN entries
2505  * @create: if true, create VLAN objects if not found
2506  *
2507  * Return true if all the received CRCs match the locally stored ones, false
2508  * otherwise
2509  */
2510 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2511                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2512                                        u16 num_vlan)
2513 {
2514         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2515         struct batadv_orig_node_vlan *vlan;
2516         u32 crc;
2517         int i;
2518
2519         /* check if each received CRC matches the locally stored one */
2520         for (i = 0; i < num_vlan; i++) {
2521                 tt_vlan_tmp = tt_vlan + i;
2522
2523                 /* if orig_node is a backbone node for this VLAN, don't check
2524                  * the CRC as we ignore all the global entries over it
2525                  */
2526                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2527                                                    orig_node->orig,
2528                                                    ntohs(tt_vlan_tmp->vid)))
2529                         continue;
2530
2531                 vlan = batadv_orig_node_vlan_get(orig_node,
2532                                                  ntohs(tt_vlan_tmp->vid));
2533                 if (!vlan)
2534                         return false;
2535
2536                 crc = vlan->tt.crc;
2537                 batadv_orig_node_vlan_free_ref(vlan);
2538
2539                 if (crc != ntohl(tt_vlan_tmp->crc))
2540                         return false;
2541         }
2542
2543         return true;
2544 }
2545
2546 /**
2547  * batadv_tt_local_update_crc - update all the local CRCs
2548  * @bat_priv: the bat priv with all the soft interface information
2549  */
2550 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2551 {
2552         struct batadv_softif_vlan *vlan;
2553
2554         /* recompute the global CRC for each VLAN */
2555         rcu_read_lock();
2556         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2557                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2558         }
2559         rcu_read_unlock();
2560 }
2561
2562 /**
2563  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2564  * @bat_priv: the bat priv with all the soft interface information
2565  * @orig_node: the orig_node for which the CRCs have to be updated
2566  */
2567 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2568                                         struct batadv_orig_node *orig_node)
2569 {
2570         struct batadv_orig_node_vlan *vlan;
2571         u32 crc;
2572
2573         /* recompute the global CRC for each VLAN */
2574         rcu_read_lock();
2575         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2576                 /* if orig_node is a backbone node for this VLAN, don't compute
2577                  * the CRC as we ignore all the global entries over it
2578                  */
2579                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2580                                                    vlan->vid))
2581                         continue;
2582
2583                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2584                 vlan->tt.crc = crc;
2585         }
2586         rcu_read_unlock();
2587 }
2588
2589 /**
2590  * batadv_send_tt_request - send a TT Request message to a given node
2591  * @bat_priv: the bat priv with all the soft interface information
2592  * @dst_orig_node: the destination of the message
2593  * @ttvn: the version number that the source of the message is looking for
2594  * @tt_vlan: pointer to the first tvlv VLAN object to request
2595  * @num_vlan: number of tvlv VLAN entries
2596  * @full_table: ask for the entire translation table if true, while only for the
2597  *  last TT diff otherwise
2598  */
2599 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2600                                   struct batadv_orig_node *dst_orig_node,
2601                                   u8 ttvn,
2602                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2603                                   u16 num_vlan, bool full_table)
2604 {
2605         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2606         struct batadv_tt_req_node *tt_req_node = NULL;
2607         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2608         struct batadv_hard_iface *primary_if;
2609         bool ret = false;
2610         int i, size;
2611
2612         primary_if = batadv_primary_if_get_selected(bat_priv);
2613         if (!primary_if)
2614                 goto out;
2615
2616         /* The new tt_req will be issued only if I'm not waiting for a
2617          * reply from the same orig_node yet
2618          */
2619         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2620         if (!tt_req_node)
2621                 goto out;
2622
2623         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2624         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2625         if (!tvlv_tt_data)
2626                 goto out;
2627
2628         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2629         tvlv_tt_data->ttvn = ttvn;
2630         tvlv_tt_data->num_vlan = htons(num_vlan);
2631
2632         /* send all the CRCs within the request. This is needed by intermediate
2633          * nodes to ensure they have the correct table before replying
2634          */
2635         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2636         for (i = 0; i < num_vlan; i++) {
2637                 tt_vlan_req->vid = tt_vlan->vid;
2638                 tt_vlan_req->crc = tt_vlan->crc;
2639
2640                 tt_vlan_req++;
2641                 tt_vlan++;
2642         }
2643
2644         if (full_table)
2645                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2646
2647         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2648                    dst_orig_node->orig, full_table ? 'F' : '.');
2649
2650         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2651         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2652                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2653                                  tvlv_tt_data, size);
2654         ret = true;
2655
2656 out:
2657         if (primary_if)
2658                 batadv_hardif_free_ref(primary_if);
2659
2660         if (ret && tt_req_node) {
2661                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2662                 if (!hlist_unhashed(&tt_req_node->list)) {
2663                         hlist_del_init(&tt_req_node->list);
2664                         batadv_tt_req_node_put(tt_req_node);
2665                 }
2666                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2667         }
2668
2669         if (tt_req_node)
2670                 batadv_tt_req_node_put(tt_req_node);
2671
2672         kfree(tvlv_tt_data);
2673         return ret;
2674 }
2675
2676 /**
2677  * batadv_send_other_tt_response - send reply to tt request concerning another
2678  *  node's translation table
2679  * @bat_priv: the bat priv with all the soft interface information
2680  * @tt_data: tt data containing the tt request information
2681  * @req_src: mac address of tt request sender
2682  * @req_dst: mac address of tt request recipient
2683  *
2684  * Returns true if tt request reply was sent, false otherwise.
2685  */
2686 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2687                                           struct batadv_tvlv_tt_data *tt_data,
2688                                           u8 *req_src, u8 *req_dst)
2689 {
2690         struct batadv_orig_node *req_dst_orig_node;
2691         struct batadv_orig_node *res_dst_orig_node = NULL;
2692         struct batadv_tvlv_tt_change *tt_change;
2693         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2694         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2695         bool ret = false, full_table;
2696         u8 orig_ttvn, req_ttvn;
2697         u16 tvlv_len;
2698         s32 tt_len;
2699
2700         batadv_dbg(BATADV_DBG_TT, bat_priv,
2701                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2702                    req_src, tt_data->ttvn, req_dst,
2703                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2704
2705         /* Let's get the orig node of the REAL destination */
2706         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2707         if (!req_dst_orig_node)
2708                 goto out;
2709
2710         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2711         if (!res_dst_orig_node)
2712                 goto out;
2713
2714         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2715         req_ttvn = tt_data->ttvn;
2716
2717         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2718         /* this node doesn't have the requested data */
2719         if (orig_ttvn != req_ttvn ||
2720             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2721                                         ntohs(tt_data->num_vlan)))
2722                 goto out;
2723
2724         /* If the full table has been explicitly requested */
2725         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2726             !req_dst_orig_node->tt_buff)
2727                 full_table = true;
2728         else
2729                 full_table = false;
2730
2731         /* TT fragmentation hasn't been implemented yet, so send as many
2732          * TT entries fit a single packet as possible only
2733          */
2734         if (!full_table) {
2735                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2736                 tt_len = req_dst_orig_node->tt_buff_len;
2737
2738                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2739                                                               &tvlv_tt_data,
2740                                                               &tt_change,
2741                                                               &tt_len);
2742                 if (!tt_len)
2743                         goto unlock;
2744
2745                 /* Copy the last orig_node's OGM buffer */
2746                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2747                        req_dst_orig_node->tt_buff_len);
2748                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2749         } else {
2750                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2751                  * in the initial part
2752                  */
2753                 tt_len = -1;
2754                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2755                                                               &tvlv_tt_data,
2756                                                               &tt_change,
2757                                                               &tt_len);
2758                 if (!tt_len)
2759                         goto out;
2760
2761                 /* fill the rest of the tvlv with the real TT entries */
2762                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2763                                         tt_change, tt_len,
2764                                         batadv_tt_global_valid,
2765                                         req_dst_orig_node);
2766         }
2767
2768         /* Don't send the response, if larger than fragmented packet. */
2769         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2770         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2771                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2772                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2773                                          res_dst_orig_node->orig);
2774                 goto out;
2775         }
2776
2777         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2778         tvlv_tt_data->ttvn = req_ttvn;
2779
2780         if (full_table)
2781                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2782
2783         batadv_dbg(BATADV_DBG_TT, bat_priv,
2784                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2785                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2786                    full_table ? 'F' : '.', req_ttvn);
2787
2788         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2789
2790         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2791                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2792                                  tvlv_len);
2793
2794         ret = true;
2795         goto out;
2796
2797 unlock:
2798         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2799
2800 out:
2801         if (res_dst_orig_node)
2802                 batadv_orig_node_free_ref(res_dst_orig_node);
2803         if (req_dst_orig_node)
2804                 batadv_orig_node_free_ref(req_dst_orig_node);
2805         kfree(tvlv_tt_data);
2806         return ret;
2807 }
2808
2809 /**
2810  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2811  *  translation table
2812  * @bat_priv: the bat priv with all the soft interface information
2813  * @tt_data: tt data containing the tt request information
2814  * @req_src: mac address of tt request sender
2815  *
2816  * Returns true if tt request reply was sent, false otherwise.
2817  */
2818 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2819                                        struct batadv_tvlv_tt_data *tt_data,
2820                                        u8 *req_src)
2821 {
2822         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2823         struct batadv_hard_iface *primary_if = NULL;
2824         struct batadv_tvlv_tt_change *tt_change;
2825         struct batadv_orig_node *orig_node;
2826         u8 my_ttvn, req_ttvn;
2827         u16 tvlv_len;
2828         bool full_table;
2829         s32 tt_len;
2830
2831         batadv_dbg(BATADV_DBG_TT, bat_priv,
2832                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2833                    req_src, tt_data->ttvn,
2834                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2835
2836         spin_lock_bh(&bat_priv->tt.commit_lock);
2837
2838         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2839         req_ttvn = tt_data->ttvn;
2840
2841         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2842         if (!orig_node)
2843                 goto out;
2844
2845         primary_if = batadv_primary_if_get_selected(bat_priv);
2846         if (!primary_if)
2847                 goto out;
2848
2849         /* If the full table has been explicitly requested or the gap
2850          * is too big send the whole local translation table
2851          */
2852         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2853             !bat_priv->tt.last_changeset)
2854                 full_table = true;
2855         else
2856                 full_table = false;
2857
2858         /* TT fragmentation hasn't been implemented yet, so send as many
2859          * TT entries fit a single packet as possible only
2860          */
2861         if (!full_table) {
2862                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2863
2864                 tt_len = bat_priv->tt.last_changeset_len;
2865                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2866                                                              &tvlv_tt_data,
2867                                                              &tt_change,
2868                                                              &tt_len);
2869                 if (!tt_len || !tvlv_len)
2870                         goto unlock;
2871
2872                 /* Copy the last orig_node's OGM buffer */
2873                 memcpy(tt_change, bat_priv->tt.last_changeset,
2874                        bat_priv->tt.last_changeset_len);
2875                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2876         } else {
2877                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2878
2879                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2880                  * in the initial part
2881                  */
2882                 tt_len = -1;
2883                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2884                                                              &tvlv_tt_data,
2885                                                              &tt_change,
2886                                                              &tt_len);
2887                 if (!tt_len || !tvlv_len)
2888                         goto out;
2889
2890                 /* fill the rest of the tvlv with the real TT entries */
2891                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2892                                         tt_change, tt_len,
2893                                         batadv_tt_local_valid, NULL);
2894         }
2895
2896         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2897         tvlv_tt_data->ttvn = req_ttvn;
2898
2899         if (full_table)
2900                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2901
2902         batadv_dbg(BATADV_DBG_TT, bat_priv,
2903                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2904                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2905
2906         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2907
2908         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2909                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2910                                  tvlv_len);
2911
2912         goto out;
2913
2914 unlock:
2915         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2916 out:
2917         spin_unlock_bh(&bat_priv->tt.commit_lock);
2918         if (orig_node)
2919                 batadv_orig_node_free_ref(orig_node);
2920         if (primary_if)
2921                 batadv_hardif_free_ref(primary_if);
2922         kfree(tvlv_tt_data);
2923         /* The packet was for this host, so it doesn't need to be re-routed */
2924         return true;
2925 }
2926
2927 /**
2928  * batadv_send_tt_response - send reply to tt request
2929  * @bat_priv: the bat priv with all the soft interface information
2930  * @tt_data: tt data containing the tt request information
2931  * @req_src: mac address of tt request sender
2932  * @req_dst: mac address of tt request recipient
2933  *
2934  * Returns true if tt request reply was sent, false otherwise.
2935  */
2936 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2937                                     struct batadv_tvlv_tt_data *tt_data,
2938                                     u8 *req_src, u8 *req_dst)
2939 {
2940         if (batadv_is_my_mac(bat_priv, req_dst))
2941                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2942         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2943                                              req_dst);
2944 }
2945
2946 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2947                                       struct batadv_orig_node *orig_node,
2948                                       struct batadv_tvlv_tt_change *tt_change,
2949                                       u16 tt_num_changes, u8 ttvn)
2950 {
2951         int i;
2952         int roams;
2953
2954         for (i = 0; i < tt_num_changes; i++) {
2955                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2956                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2957                         batadv_tt_global_del(bat_priv, orig_node,
2958                                              (tt_change + i)->addr,
2959                                              ntohs((tt_change + i)->vid),
2960                                              "tt removed by changes",
2961                                              roams);
2962                 } else {
2963                         if (!batadv_tt_global_add(bat_priv, orig_node,
2964                                                   (tt_change + i)->addr,
2965                                                   ntohs((tt_change + i)->vid),
2966                                                   (tt_change + i)->flags, ttvn))
2967                                 /* In case of problem while storing a
2968                                  * global_entry, we stop the updating
2969                                  * procedure without committing the
2970                                  * ttvn change. This will avoid to send
2971                                  * corrupted data on tt_request
2972                                  */
2973                                 return;
2974                 }
2975         }
2976         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2977 }
2978
2979 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2980                                   struct batadv_tvlv_tt_change *tt_change,
2981                                   u8 ttvn, u8 *resp_src,
2982                                   u16 num_entries)
2983 {
2984         struct batadv_orig_node *orig_node;
2985
2986         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2987         if (!orig_node)
2988                 goto out;
2989
2990         /* Purge the old table first.. */
2991         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2992                                   "Received full table");
2993
2994         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2995                                   ttvn);
2996
2997         spin_lock_bh(&orig_node->tt_buff_lock);
2998         kfree(orig_node->tt_buff);
2999         orig_node->tt_buff_len = 0;
3000         orig_node->tt_buff = NULL;
3001         spin_unlock_bh(&orig_node->tt_buff_lock);
3002
3003         atomic_set(&orig_node->last_ttvn, ttvn);
3004
3005 out:
3006         if (orig_node)
3007                 batadv_orig_node_free_ref(orig_node);
3008 }
3009
3010 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
3011                                      struct batadv_orig_node *orig_node,
3012                                      u16 tt_num_changes, u8 ttvn,
3013                                      struct batadv_tvlv_tt_change *tt_change)
3014 {
3015         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
3016                                   tt_num_changes, ttvn);
3017
3018         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3019                                    batadv_tt_len(tt_num_changes));
3020         atomic_set(&orig_node->last_ttvn, ttvn);
3021 }
3022
3023 /**
3024  * batadv_is_my_client - check if a client is served by the local node
3025  * @bat_priv: the bat priv with all the soft interface information
3026  * @addr: the mac address of the client to check
3027  * @vid: VLAN identifier
3028  *
3029  * Returns true if the client is served by this node, false otherwise.
3030  */
3031 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3032                          unsigned short vid)
3033 {
3034         struct batadv_tt_local_entry *tt_local_entry;
3035         bool ret = false;
3036
3037         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3038         if (!tt_local_entry)
3039                 goto out;
3040         /* Check if the client has been logically deleted (but is kept for
3041          * consistency purpose)
3042          */
3043         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3044             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3045                 goto out;
3046         ret = true;
3047 out:
3048         if (tt_local_entry)
3049                 batadv_tt_local_entry_free_ref(tt_local_entry);
3050         return ret;
3051 }
3052
3053 /**
3054  * batadv_handle_tt_response - process incoming tt reply
3055  * @bat_priv: the bat priv with all the soft interface information
3056  * @tt_data: tt data containing the tt request information
3057  * @resp_src: mac address of tt reply sender
3058  * @num_entries: number of tt change entries appended to the tt data
3059  */
3060 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3061                                       struct batadv_tvlv_tt_data *tt_data,
3062                                       u8 *resp_src, u16 num_entries)
3063 {
3064         struct batadv_tt_req_node *node;
3065         struct hlist_node *safe;
3066         struct batadv_orig_node *orig_node = NULL;
3067         struct batadv_tvlv_tt_change *tt_change;
3068         u8 *tvlv_ptr = (u8 *)tt_data;
3069         u16 change_offset;
3070
3071         batadv_dbg(BATADV_DBG_TT, bat_priv,
3072                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3073                    resp_src, tt_data->ttvn, num_entries,
3074                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3075
3076         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3077         if (!orig_node)
3078                 goto out;
3079
3080         spin_lock_bh(&orig_node->tt_lock);
3081
3082         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3083         change_offset *= ntohs(tt_data->num_vlan);
3084         change_offset += sizeof(*tt_data);
3085         tvlv_ptr += change_offset;
3086
3087         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3088         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3089                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3090                                       resp_src, num_entries);
3091         } else {
3092                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3093                                          tt_data->ttvn, tt_change);
3094         }
3095
3096         /* Recalculate the CRC for this orig_node and store it */
3097         batadv_tt_global_update_crc(bat_priv, orig_node);
3098
3099         spin_unlock_bh(&orig_node->tt_lock);
3100
3101         /* Delete the tt_req_node from pending tt_requests list */
3102         spin_lock_bh(&bat_priv->tt.req_list_lock);
3103         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3104                 if (!batadv_compare_eth(node->addr, resp_src))
3105                         continue;
3106                 hlist_del_init(&node->list);
3107                 batadv_tt_req_node_put(node);
3108         }
3109
3110         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3111 out:
3112         if (orig_node)
3113                 batadv_orig_node_free_ref(orig_node);
3114 }
3115
3116 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3117 {
3118         struct batadv_tt_roam_node *node, *safe;
3119
3120         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3121
3122         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3123                 list_del(&node->list);
3124                 kfree(node);
3125         }
3126
3127         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3128 }
3129
3130 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3131 {
3132         struct batadv_tt_roam_node *node, *safe;
3133
3134         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3135         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3136                 if (!batadv_has_timed_out(node->first_time,
3137                                           BATADV_ROAMING_MAX_TIME))
3138                         continue;
3139
3140                 list_del(&node->list);
3141                 kfree(node);
3142         }
3143         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3144 }
3145
3146 /* This function checks whether the client already reached the
3147  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3148  * will not be sent.
3149  *
3150  * returns true if the ROAMING_ADV can be sent, false otherwise
3151  */
3152 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3153 {
3154         struct batadv_tt_roam_node *tt_roam_node;
3155         bool ret = false;
3156
3157         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3158         /* The new tt_req will be issued only if I'm not waiting for a
3159          * reply from the same orig_node yet
3160          */
3161         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3162                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3163                         continue;
3164
3165                 if (batadv_has_timed_out(tt_roam_node->first_time,
3166                                          BATADV_ROAMING_MAX_TIME))
3167                         continue;
3168
3169                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3170                         /* Sorry, you roamed too many times! */
3171                         goto unlock;
3172                 ret = true;
3173                 break;
3174         }
3175
3176         if (!ret) {
3177                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3178                 if (!tt_roam_node)
3179                         goto unlock;
3180
3181                 tt_roam_node->first_time = jiffies;
3182                 atomic_set(&tt_roam_node->counter,
3183                            BATADV_ROAMING_MAX_COUNT - 1);
3184                 ether_addr_copy(tt_roam_node->addr, client);
3185
3186                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3187                 ret = true;
3188         }
3189
3190 unlock:
3191         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3192         return ret;
3193 }
3194
3195 /**
3196  * batadv_send_roam_adv - send a roaming advertisement message
3197  * @bat_priv: the bat priv with all the soft interface information
3198  * @client: mac address of the roaming client
3199  * @vid: VLAN identifier
3200  * @orig_node: message destination
3201  *
3202  * Send a ROAMING_ADV message to the node which was previously serving this
3203  * client. This is done to inform the node that from now on all traffic destined
3204  * for this particular roamed client has to be forwarded to the sender of the
3205  * roaming message.
3206  */
3207 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3208                                  unsigned short vid,
3209                                  struct batadv_orig_node *orig_node)
3210 {
3211         struct batadv_hard_iface *primary_if;
3212         struct batadv_tvlv_roam_adv tvlv_roam;
3213
3214         primary_if = batadv_primary_if_get_selected(bat_priv);
3215         if (!primary_if)
3216                 goto out;
3217
3218         /* before going on we have to check whether the client has
3219          * already roamed to us too many times
3220          */
3221         if (!batadv_tt_check_roam_count(bat_priv, client))
3222                 goto out;
3223
3224         batadv_dbg(BATADV_DBG_TT, bat_priv,
3225                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3226                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3227
3228         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3229
3230         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3231         tvlv_roam.vid = htons(vid);
3232
3233         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3234                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3235                                  &tvlv_roam, sizeof(tvlv_roam));
3236
3237 out:
3238         if (primary_if)
3239                 batadv_hardif_free_ref(primary_if);
3240 }
3241
3242 static void batadv_tt_purge(struct work_struct *work)
3243 {
3244         struct delayed_work *delayed_work;
3245         struct batadv_priv_tt *priv_tt;
3246         struct batadv_priv *bat_priv;
3247
3248         delayed_work = container_of(work, struct delayed_work, work);
3249         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3250         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3251
3252         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3253         batadv_tt_global_purge(bat_priv);
3254         batadv_tt_req_purge(bat_priv);
3255         batadv_tt_roam_purge(bat_priv);
3256
3257         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3258                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3259 }
3260
3261 void batadv_tt_free(struct batadv_priv *bat_priv)
3262 {
3263         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_ROAM, 1);
3264
3265         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3266         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3267
3268         cancel_delayed_work_sync(&bat_priv->tt.work);
3269
3270         batadv_tt_local_table_free(bat_priv);
3271         batadv_tt_global_table_free(bat_priv);
3272         batadv_tt_req_list_free(bat_priv);
3273         batadv_tt_changes_list_free(bat_priv);
3274         batadv_tt_roam_list_free(bat_priv);
3275
3276         kfree(bat_priv->tt.last_changeset);
3277 }
3278
3279 /**
3280  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3281  *  table and possibly count them in the TT size
3282  * @bat_priv: the bat priv with all the soft interface information
3283  * @flags: the flag to switch
3284  * @enable: whether to set or unset the flag
3285  * @count: whether to increase the TT size by the number of changed entries
3286  */
3287 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3288                                       bool enable, bool count)
3289 {
3290         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3291         struct batadv_tt_common_entry *tt_common_entry;
3292         u16 changed_num = 0;
3293         struct hlist_head *head;
3294         u32 i;
3295
3296         if (!hash)
3297                 return;
3298
3299         for (i = 0; i < hash->size; i++) {
3300                 head = &hash->table[i];
3301
3302                 rcu_read_lock();
3303                 hlist_for_each_entry_rcu(tt_common_entry,
3304                                          head, hash_entry) {
3305                         if (enable) {
3306                                 if ((tt_common_entry->flags & flags) == flags)
3307                                         continue;
3308                                 tt_common_entry->flags |= flags;
3309                         } else {
3310                                 if (!(tt_common_entry->flags & flags))
3311                                         continue;
3312                                 tt_common_entry->flags &= ~flags;
3313                         }
3314                         changed_num++;
3315
3316                         if (!count)
3317                                 continue;
3318
3319                         batadv_tt_local_size_inc(bat_priv,
3320                                                  tt_common_entry->vid);
3321                 }
3322                 rcu_read_unlock();
3323         }
3324 }
3325
3326 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3327 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3328 {
3329         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3330         struct batadv_tt_common_entry *tt_common;
3331         struct batadv_tt_local_entry *tt_local;
3332         struct hlist_node *node_tmp;
3333         struct hlist_head *head;
3334         spinlock_t *list_lock; /* protects write access to the hash lists */
3335         u32 i;
3336
3337         if (!hash)
3338                 return;
3339
3340         for (i = 0; i < hash->size; i++) {
3341                 head = &hash->table[i];
3342                 list_lock = &hash->list_locks[i];
3343
3344                 spin_lock_bh(list_lock);
3345                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3346                                           hash_entry) {
3347                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3348                                 continue;
3349
3350                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3351                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3352                                    tt_common->addr,
3353                                    BATADV_PRINT_VID(tt_common->vid));
3354
3355                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3356                         hlist_del_rcu(&tt_common->hash_entry);
3357                         tt_local = container_of(tt_common,
3358                                                 struct batadv_tt_local_entry,
3359                                                 common);
3360
3361                         batadv_tt_local_entry_free_ref(tt_local);
3362                 }
3363                 spin_unlock_bh(list_lock);
3364         }
3365 }
3366
3367 /**
3368  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3369  *  which have been queued in the time since the last commit
3370  * @bat_priv: the bat priv with all the soft interface information
3371  *
3372  * Caller must hold tt->commit_lock.
3373  */
3374 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3375 {
3376         lockdep_assert_held(&bat_priv->tt.commit_lock);
3377
3378         /* Update multicast addresses in local translation table */
3379         batadv_mcast_mla_update(bat_priv);
3380
3381         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3382                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3383                         batadv_tt_tvlv_container_update(bat_priv);
3384                 return;
3385         }
3386
3387         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3388
3389         batadv_tt_local_purge_pending_clients(bat_priv);
3390         batadv_tt_local_update_crc(bat_priv);
3391
3392         /* Increment the TTVN only once per OGM interval */
3393         atomic_inc(&bat_priv->tt.vn);
3394         batadv_dbg(BATADV_DBG_TT, bat_priv,
3395                    "Local changes committed, updating to ttvn %u\n",
3396                    (u8)atomic_read(&bat_priv->tt.vn));
3397
3398         /* reset the sending counter */
3399         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3400         batadv_tt_tvlv_container_update(bat_priv);
3401 }
3402
3403 /**
3404  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3405  *  have been queued in the time since the last commit
3406  * @bat_priv: the bat priv with all the soft interface information
3407  */
3408 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3409 {
3410         spin_lock_bh(&bat_priv->tt.commit_lock);
3411         batadv_tt_local_commit_changes_nolock(bat_priv);
3412         spin_unlock_bh(&bat_priv->tt.commit_lock);
3413 }
3414
3415 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3416                            unsigned short vid)
3417 {
3418         struct batadv_tt_local_entry *tt_local_entry = NULL;
3419         struct batadv_tt_global_entry *tt_global_entry = NULL;
3420         struct batadv_softif_vlan *vlan;
3421         bool ret = false;
3422
3423         vlan = batadv_softif_vlan_get(bat_priv, vid);
3424         if (!vlan || !atomic_read(&vlan->ap_isolation))
3425                 goto out;
3426
3427         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3428         if (!tt_local_entry)
3429                 goto out;
3430
3431         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3432         if (!tt_global_entry)
3433                 goto out;
3434
3435         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3436                 goto out;
3437
3438         ret = true;
3439
3440 out:
3441         if (vlan)
3442                 batadv_softif_vlan_free_ref(vlan);
3443         if (tt_global_entry)
3444                 batadv_tt_global_entry_free_ref(tt_global_entry);
3445         if (tt_local_entry)
3446                 batadv_tt_local_entry_free_ref(tt_local_entry);
3447         return ret;
3448 }
3449
3450 /**
3451  * batadv_tt_update_orig - update global translation table with new tt
3452  *  information received via ogms
3453  * @bat_priv: the bat priv with all the soft interface information
3454  * @orig: the orig_node of the ogm
3455  * @tt_vlan: pointer to the first tvlv VLAN entry
3456  * @tt_num_vlan: number of tvlv VLAN entries
3457  * @tt_change: pointer to the first entry in the TT buffer
3458  * @tt_num_changes: number of tt changes inside the tt buffer
3459  * @ttvn: translation table version number of this changeset
3460  * @tt_crc: crc32 checksum of orig node's translation table
3461  */
3462 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3463                                   struct batadv_orig_node *orig_node,
3464                                   const void *tt_buff, u16 tt_num_vlan,
3465                                   struct batadv_tvlv_tt_change *tt_change,
3466                                   u16 tt_num_changes, u8 ttvn)
3467 {
3468         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3469         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3470         bool full_table = true;
3471         bool has_tt_init;
3472
3473         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3474         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3475                                &orig_node->capa_initialized);
3476
3477         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3478          * increased by one -> we can apply the attached changes
3479          */
3480         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3481                 /* the OGM could not contain the changes due to their size or
3482                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3483                  * times.
3484                  * In this case send a tt request
3485                  */
3486                 if (!tt_num_changes) {
3487                         full_table = false;
3488                         goto request_table;
3489                 }
3490
3491                 spin_lock_bh(&orig_node->tt_lock);
3492
3493                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3494                                          ttvn, tt_change);
3495
3496                 /* Even if we received the precomputed crc with the OGM, we
3497                  * prefer to recompute it to spot any possible inconsistency
3498                  * in the global table
3499                  */
3500                 batadv_tt_global_update_crc(bat_priv, orig_node);
3501
3502                 spin_unlock_bh(&orig_node->tt_lock);
3503
3504                 /* The ttvn alone is not enough to guarantee consistency
3505                  * because a single value could represent different states
3506                  * (due to the wrap around). Thus a node has to check whether
3507                  * the resulting table (after applying the changes) is still
3508                  * consistent or not. E.g. a node could disconnect while its
3509                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3510                  * checking the CRC value is mandatory to detect the
3511                  * inconsistency
3512                  */
3513                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3514                                                 tt_num_vlan))
3515                         goto request_table;
3516         } else {
3517                 /* if we missed more than one change or our tables are not
3518                  * in sync anymore -> request fresh tt data
3519                  */
3520                 if (!has_tt_init || ttvn != orig_ttvn ||
3521                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3522                                                 tt_num_vlan)) {
3523 request_table:
3524                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3525                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3526                                    orig_node->orig, ttvn, orig_ttvn,
3527                                    tt_num_changes);
3528                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3529                                                tt_vlan, tt_num_vlan,
3530                                                full_table);
3531                         return;
3532                 }
3533         }
3534 }
3535
3536 /**
3537  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3538  * @bat_priv: the bat priv with all the soft interface information
3539  * @addr: the mac address of the client to check
3540  * @vid: VLAN identifier
3541  *
3542  * Returns true if we know that the client has moved from its old originator
3543  * to another one. This entry is still kept for consistency purposes and will be
3544  * deleted later by a DEL or because of timeout
3545  */
3546 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3547                                         u8 *addr, unsigned short vid)
3548 {
3549         struct batadv_tt_global_entry *tt_global_entry;
3550         bool ret = false;
3551
3552         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3553         if (!tt_global_entry)
3554                 goto out;
3555
3556         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3557         batadv_tt_global_entry_free_ref(tt_global_entry);
3558 out:
3559         return ret;
3560 }
3561
3562 /**
3563  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3564  * @bat_priv: the bat priv with all the soft interface information
3565  * @addr: the mac address of the local client to query
3566  * @vid: VLAN identifier
3567  *
3568  * Returns true if the local client is known to be roaming (it is not served by
3569  * this node anymore) or not. If yes, the client is still present in the table
3570  * to keep the latter consistent with the node TTVN
3571  */
3572 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3573                                        u8 *addr, unsigned short vid)
3574 {
3575         struct batadv_tt_local_entry *tt_local_entry;
3576         bool ret = false;
3577
3578         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3579         if (!tt_local_entry)
3580                 goto out;
3581
3582         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3583         batadv_tt_local_entry_free_ref(tt_local_entry);
3584 out:
3585         return ret;
3586 }
3587
3588 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3589                                           struct batadv_orig_node *orig_node,
3590                                           const unsigned char *addr,
3591                                           unsigned short vid)
3592 {
3593         bool ret = false;
3594
3595         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3596                                   BATADV_TT_CLIENT_TEMP,
3597                                   atomic_read(&orig_node->last_ttvn)))
3598                 goto out;
3599
3600         batadv_dbg(BATADV_DBG_TT, bat_priv,
3601                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3602                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3603         ret = true;
3604 out:
3605         return ret;
3606 }
3607
3608 /**
3609  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3610  *  maximum packet size that can be transported through the mesh
3611  * @soft_iface: netdev struct of the mesh interface
3612  *
3613  * Remove entries older than 'timeout' and half timeout if more entries need
3614  * to be removed.
3615  */
3616 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3617 {
3618         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3619         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3620         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3621         bool reduced = false;
3622
3623         spin_lock_bh(&bat_priv->tt.commit_lock);
3624
3625         while (true) {
3626                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3627                 if (packet_size_max >= table_size)
3628                         break;
3629
3630                 batadv_tt_local_purge(bat_priv, timeout);
3631                 batadv_tt_local_purge_pending_clients(bat_priv);
3632
3633                 timeout /= 2;
3634                 reduced = true;
3635                 net_ratelimited_function(batadv_info, soft_iface,
3636                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3637                                          packet_size_max);
3638         }
3639
3640         /* commit these changes immediately, to avoid synchronization problem
3641          * with the TTVN
3642          */
3643         if (reduced)
3644                 batadv_tt_local_commit_changes_nolock(bat_priv);
3645
3646         spin_unlock_bh(&bat_priv->tt.commit_lock);
3647 }
3648
3649 /**
3650  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3651  * @bat_priv: the bat priv with all the soft interface information
3652  * @orig: the orig_node of the ogm
3653  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3654  * @tvlv_value: tvlv buffer containing the gateway data
3655  * @tvlv_value_len: tvlv buffer length
3656  */
3657 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3658                                           struct batadv_orig_node *orig,
3659                                           u8 flags, void *tvlv_value,
3660                                           u16 tvlv_value_len)
3661 {
3662         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3663         struct batadv_tvlv_tt_change *tt_change;
3664         struct batadv_tvlv_tt_data *tt_data;
3665         u16 num_entries, num_vlan;
3666
3667         if (tvlv_value_len < sizeof(*tt_data))
3668                 return;
3669
3670         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3671         tvlv_value_len -= sizeof(*tt_data);
3672
3673         num_vlan = ntohs(tt_data->num_vlan);
3674
3675         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3676                 return;
3677
3678         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3679         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3680         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3681
3682         num_entries = batadv_tt_entries(tvlv_value_len);
3683
3684         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3685                               num_entries, tt_data->ttvn);
3686 }
3687
3688 /**
3689  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3690  *  container
3691  * @bat_priv: the bat priv with all the soft interface information
3692  * @src: mac address of tt tvlv sender
3693  * @dst: mac address of tt tvlv recipient
3694  * @tvlv_value: tvlv buffer containing the tt data
3695  * @tvlv_value_len: tvlv buffer length
3696  *
3697  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3698  * otherwise.
3699  */
3700 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3701                                              u8 *src, u8 *dst,
3702                                              void *tvlv_value,
3703                                              u16 tvlv_value_len)
3704 {
3705         struct batadv_tvlv_tt_data *tt_data;
3706         u16 tt_vlan_len, tt_num_entries;
3707         char tt_flag;
3708         bool ret;
3709
3710         if (tvlv_value_len < sizeof(*tt_data))
3711                 return NET_RX_SUCCESS;
3712
3713         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3714         tvlv_value_len -= sizeof(*tt_data);
3715
3716         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3717         tt_vlan_len *= ntohs(tt_data->num_vlan);
3718
3719         if (tvlv_value_len < tt_vlan_len)
3720                 return NET_RX_SUCCESS;
3721
3722         tvlv_value_len -= tt_vlan_len;
3723         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3724
3725         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3726         case BATADV_TT_REQUEST:
3727                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3728
3729                 /* If this node cannot provide a TT response the tt_request is
3730                  * forwarded
3731                  */
3732                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3733                 if (!ret) {
3734                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3735                                 tt_flag = 'F';
3736                         else
3737                                 tt_flag = '.';
3738
3739                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3740                                    "Routing TT_REQUEST to %pM [%c]\n",
3741                                    dst, tt_flag);
3742                         /* tvlv API will re-route the packet */
3743                         return NET_RX_DROP;
3744                 }
3745                 break;
3746         case BATADV_TT_RESPONSE:
3747                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3748
3749                 if (batadv_is_my_mac(bat_priv, dst)) {
3750                         batadv_handle_tt_response(bat_priv, tt_data,
3751                                                   src, tt_num_entries);
3752                         return NET_RX_SUCCESS;
3753                 }
3754
3755                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3756                         tt_flag =  'F';
3757                 else
3758                         tt_flag = '.';
3759
3760                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3761                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3762
3763                 /* tvlv API will re-route the packet */
3764                 return NET_RX_DROP;
3765         }
3766
3767         return NET_RX_SUCCESS;
3768 }
3769
3770 /**
3771  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3772  * @bat_priv: the bat priv with all the soft interface information
3773  * @src: mac address of tt tvlv sender
3774  * @dst: mac address of tt tvlv recipient
3775  * @tvlv_value: tvlv buffer containing the tt data
3776  * @tvlv_value_len: tvlv buffer length
3777  *
3778  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3779  * otherwise.
3780  */
3781 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3782                                                u8 *src, u8 *dst,
3783                                                void *tvlv_value,
3784                                                u16 tvlv_value_len)
3785 {
3786         struct batadv_tvlv_roam_adv *roaming_adv;
3787         struct batadv_orig_node *orig_node = NULL;
3788
3789         /* If this node is not the intended recipient of the
3790          * roaming advertisement the packet is forwarded
3791          * (the tvlv API will re-route the packet).
3792          */
3793         if (!batadv_is_my_mac(bat_priv, dst))
3794                 return NET_RX_DROP;
3795
3796         if (tvlv_value_len < sizeof(*roaming_adv))
3797                 goto out;
3798
3799         orig_node = batadv_orig_hash_find(bat_priv, src);
3800         if (!orig_node)
3801                 goto out;
3802
3803         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3804         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3805
3806         batadv_dbg(BATADV_DBG_TT, bat_priv,
3807                    "Received ROAMING_ADV from %pM (client %pM)\n",
3808                    src, roaming_adv->client);
3809
3810         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3811                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3812                              atomic_read(&orig_node->last_ttvn) + 1);
3813
3814 out:
3815         if (orig_node)
3816                 batadv_orig_node_free_ref(orig_node);
3817         return NET_RX_SUCCESS;
3818 }
3819
3820 /**
3821  * batadv_tt_init - initialise the translation table internals
3822  * @bat_priv: the bat priv with all the soft interface information
3823  *
3824  * Return 0 on success or negative error number in case of failure.
3825  */
3826 int batadv_tt_init(struct batadv_priv *bat_priv)
3827 {
3828         int ret;
3829
3830         /* synchronized flags must be remote */
3831         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3832
3833         ret = batadv_tt_local_init(bat_priv);
3834         if (ret < 0)
3835                 return ret;
3836
3837         ret = batadv_tt_global_init(bat_priv);
3838         if (ret < 0) {
3839                 batadv_tt_local_table_free(bat_priv);
3840                 return ret;
3841         }
3842
3843         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3844                                      batadv_tt_tvlv_unicast_handler_v1,
3845                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3846
3847         batadv_tvlv_handler_register(bat_priv, NULL,
3848                                      batadv_roam_tvlv_unicast_handler_v1,
3849                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3850
3851         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3852         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3853                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3854
3855         return 1;
3856 }
3857
3858 /**
3859  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3860  * @bat_priv: the bat priv with all the soft interface information
3861  * @addr: the mac address of the client
3862  * @vid: the identifier of the VLAN where this client is connected
3863  *
3864  * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3865  * otherwise
3866  */
3867 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3868                                   const u8 *addr, unsigned short vid)
3869 {
3870         struct batadv_tt_global_entry *tt;
3871         bool ret;
3872
3873         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3874         if (!tt)
3875                 return false;
3876
3877         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3878
3879         batadv_tt_global_entry_free_ref(tt);
3880
3881         return ret;
3882 }