net/batman-adv/translation-table.c

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