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 #include <net/net_namespace.h>
  47
  48 #include "bridge_loop_avoidance.h"
  49 #include "hard-interface.h"
  50 #include "hash.h"
  51 #include "multicast.h"
  52 #include "originator.h"
  53 #include "packet.h"
  54 #include "soft-interface.h"
  55
  56 /* hash class keys */
  57 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  58 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  59
  60 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
  61                                  unsigned short vid,
  62                                  struct batadv_orig_node *orig_node);
  63 static void batadv_tt_purge(struct work_struct *work);
  64 static void
  65 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  66 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  67                                  struct batadv_orig_node *orig_node,
  68                                  const unsigned char *addr,
  69                                  unsigned short vid, const char *message,
  70                                  bool roaming);
  71
  72 /**
  73  * batadv_compare_tt - check if two TT entries are the same
  74  * @node: the list element pointer of the first TT entry
  75  * @data2: pointer to the tt_common_entry of the second TT entry
  76  *
  77  * Compare the MAC address and the VLAN ID of the two TT entries and check if
  78  * they are the same TT client.
  79  * Return: 1 if the two TT clients are the same, 0 otherwise
  80  */
  81 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  82 {
  83         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  84                                          hash_entry);
  85         const struct batadv_tt_common_entry *tt1 = data1;
  86         const struct batadv_tt_common_entry *tt2 = data2;
  87
  88         return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
  89 }
  90
  91 /**
  92  * batadv_choose_tt - return the index of the tt entry in the hash table
  93  * @data: pointer to the tt_common_entry object to map
  94  * @size: the size of the hash table
  95  *
  96  * Return: the hash index where the object represented by 'data' should be
  97  * stored at.
  98  */
  99 static inline u32 batadv_choose_tt(const void *data, u32 size)
 100 {
 101         struct batadv_tt_common_entry *tt;
 102         u32 hash = 0;
 103
 104         tt = (struct batadv_tt_common_entry *)data;
 105         hash = jhash(&tt->addr, ETH_ALEN, hash);
 106         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
 107
 108         return hash % size;
 109 }
 110
 111 /**
 112  * batadv_tt_hash_find - look for a client in the given hash table
 113  * @hash: the hash table to search
 114  * @addr: the mac address of the client to look for
 115  * @vid: VLAN identifier
 116  *
 117  * Return: a pointer to the tt_common struct belonging to the searched client if
 118  * found, NULL otherwise.
 119  */
 120 static struct batadv_tt_common_entry *
 121 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
 122                     unsigned short vid)
 123 {
 124         struct hlist_head *head;
 125         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 126         u32 index;
 127
 128         if (!hash)
 129                 return NULL;
 130
 131         ether_addr_copy(to_search.addr, addr);
 132         to_search.vid = vid;
 133
 134         index = batadv_choose_tt(&to_search, hash->size);
 135         head = &hash->table[index];
 136
 137         rcu_read_lock();
 138         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 139                 if (!batadv_compare_eth(tt, addr))
 140                         continue;
 141
 142                 if (tt->vid != vid)
 143                         continue;
 144
 145                 if (!kref_get_unless_zero(&tt->refcount))
 146                         continue;
 147
 148                 tt_tmp = tt;
 149                 break;
 150         }
 151         rcu_read_unlock();
 152
 153         return tt_tmp;
 154 }
 155
 156 /**
 157  * batadv_tt_local_hash_find - search the local table for a given client
 158  * @bat_priv: the bat priv with all the soft interface information
 159  * @addr: the mac address of the client to look for
 160  * @vid: VLAN identifier
 161  *
 162  * Return: a pointer to the corresponding tt_local_entry struct if the client is
 163  * found, NULL otherwise.
 164  */
 165 static struct batadv_tt_local_entry *
 166 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 167                           unsigned short vid)
 168 {
 169         struct batadv_tt_common_entry *tt_common_entry;
 170         struct batadv_tt_local_entry *tt_local_entry = NULL;
 171
 172         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 173                                               vid);
 174         if (tt_common_entry)
 175                 tt_local_entry = container_of(tt_common_entry,
 176                                               struct batadv_tt_local_entry,
 177                                               common);
 178         return tt_local_entry;
 179 }
 180
 181 /**
 182  * batadv_tt_global_hash_find - search the global table for a given client
 183  * @bat_priv: the bat priv with all the soft interface information
 184  * @addr: the mac address of the client to look for
 185  * @vid: VLAN identifier
 186  *
 187  * Return: a pointer to the corresponding tt_global_entry struct if the client
 188  * is found, NULL otherwise.
 189  */
 190 static struct batadv_tt_global_entry *
 191 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 192                            unsigned short vid)
 193 {
 194         struct batadv_tt_common_entry *tt_common_entry;
 195         struct batadv_tt_global_entry *tt_global_entry = NULL;
 196
 197         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 198                                               vid);
 199         if (tt_common_entry)
 200                 tt_global_entry = container_of(tt_common_entry,
 201                                                struct batadv_tt_global_entry,
 202                                                common);
 203         return tt_global_entry;
 204 }
 205
 206 /**
 207  * batadv_tt_local_entry_release - release tt_local_entry from lists and queue
 208  *  for free after rcu grace period
 209  * @ref: kref pointer of the nc_node
 210  */
 211 static void batadv_tt_local_entry_release(struct kref *ref)
 212 {
 213         struct batadv_tt_local_entry *tt_local_entry;
 214
 215         tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
 216                                       common.refcount);
 217
 218         batadv_softif_vlan_put(tt_local_entry->vlan);
 219
 220         kfree_rcu(tt_local_entry, common.rcu);
 221 }
 222
 223 /**
 224  * batadv_tt_local_entry_put - decrement the tt_local_entry refcounter and
 225  *  possibly release it
 226  * @tt_local_entry: tt_local_entry to be free'd
 227  */
 228 static void
 229 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
 230 {
 231         kref_put(&tt_local_entry->common.refcount,
 232                  batadv_tt_local_entry_release);
 233 }
 234
 235 /**
 236  * batadv_tt_global_entry_release - release tt_global_entry from lists and queue
 237  *  for free after rcu grace period
 238  * @ref: kref pointer of the nc_node
 239  */
 240 static void batadv_tt_global_entry_release(struct kref *ref)
 241 {
 242         struct batadv_tt_global_entry *tt_global_entry;
 243
 244         tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
 245                                        common.refcount);
 246
 247         batadv_tt_global_del_orig_list(tt_global_entry);
 248         kfree_rcu(tt_global_entry, common.rcu);
 249 }
 250
 251 /**
 252  * batadv_tt_global_entry_put - decrement the tt_global_entry refcounter and
 253  *  possibly release it
 254  * @tt_global_entry: tt_global_entry to be free'd
 255  */
 256 static void
 257 batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
 258 {
 259         kref_put(&tt_global_entry->common.refcount,
 260                  batadv_tt_global_entry_release);
 261 }
 262
 263 /**
 264  * batadv_tt_global_hash_count - count the number of orig entries
 265  * @bat_priv: the bat priv with all the soft interface information
 266  * @addr: the mac address of the client to count entries for
 267  * @vid: VLAN identifier
 268  *
 269  * Return: the number of originators advertising the given address/data
 270  * (excluding ourself).
 271  */
 272 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
 273                                 const u8 *addr, unsigned short vid)
 274 {
 275         struct batadv_tt_global_entry *tt_global_entry;
 276         int count;
 277
 278         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 279         if (!tt_global_entry)
 280                 return 0;
 281
 282         count = atomic_read(&tt_global_entry->orig_list_count);
 283         batadv_tt_global_entry_put(tt_global_entry);
 284
 285         return count;
 286 }
 287
 288 /**
 289  * batadv_tt_local_size_mod - change the size by v of the local table identified
 290  *  by vid
 291  * @bat_priv: the bat priv with all the soft interface information
 292  * @vid: the VLAN identifier of the sub-table to change
 293  * @v: the amount to sum to the local table size
 294  */
 295 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 296                                      unsigned short vid, int v)
 297 {
 298         struct batadv_softif_vlan *vlan;
 299
 300         vlan = batadv_softif_vlan_get(bat_priv, vid);
 301         if (!vlan)
 302                 return;
 303
 304         atomic_add(v, &vlan->tt.num_entries);
 305
 306         batadv_softif_vlan_put(vlan);
 307 }
 308
 309 /**
 310  * batadv_tt_local_size_inc - increase by one the local table size for the given
 311  *  vid
 312  * @bat_priv: the bat priv with all the soft interface information
 313  * @vid: the VLAN identifier
 314  */
 315 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 316                                      unsigned short vid)
 317 {
 318         batadv_tt_local_size_mod(bat_priv, vid, 1);
 319 }
 320
 321 /**
 322  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 323  *  vid
 324  * @bat_priv: the bat priv with all the soft interface information
 325  * @vid: the VLAN identifier
 326  */
 327 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 328                                      unsigned short vid)
 329 {
 330         batadv_tt_local_size_mod(bat_priv, vid, -1);
 331 }
 332
 333 /**
 334  * batadv_tt_global_size_mod - change the size by v of the global table
 335  *  for orig_node identified by vid
 336  * @orig_node: the originator for which the table has to be modified
 337  * @vid: the VLAN identifier
 338  * @v: the amount to sum to the global table size
 339  */
 340 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 341                                       unsigned short vid, int v)
 342 {
 343         struct batadv_orig_node_vlan *vlan;
 344
 345         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 346         if (!vlan)
 347                 return;
 348
 349         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 350                 spin_lock_bh(&orig_node->vlan_list_lock);
 351                 if (!hlist_unhashed(&vlan->list)) {
 352                         hlist_del_init_rcu(&vlan->list);
 353                         batadv_orig_node_vlan_put(vlan);
 354                 }
 355                 spin_unlock_bh(&orig_node->vlan_list_lock);
 356         }
 357
 358         batadv_orig_node_vlan_put(vlan);
 359 }
 360
 361 /**
 362  * batadv_tt_global_size_inc - increase by one the global table size for the
 363  *  given vid
 364  * @orig_node: the originator which global table size has to be decreased
 365  * @vid: the vlan identifier
 366  */
 367 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 368                                       unsigned short vid)
 369 {
 370         batadv_tt_global_size_mod(orig_node, vid, 1);
 371 }
 372
 373 /**
 374  * batadv_tt_global_size_dec - decrease by one the global table size for the
 375  *  given vid
 376  * @orig_node: the originator which global table size has to be decreased
 377  * @vid: the vlan identifier
 378  */
 379 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 380                                       unsigned short vid)
 381 {
 382         batadv_tt_global_size_mod(orig_node, vid, -1);
 383 }
 384
 385 /**
 386  * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
 387  *  queue for free after rcu grace period
 388  * @ref: kref pointer of the tt orig entry
 389  */
 390 static void batadv_tt_orig_list_entry_release(struct kref *ref)
 391 {
 392         struct batadv_tt_orig_list_entry *orig_entry;
 393
 394         orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
 395                                   refcount);
 396
 397         batadv_orig_node_put(orig_entry->orig_node);
 398         kfree_rcu(orig_entry, rcu);
 399 }
 400
 401 /**
 402  * batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and
 403  *  possibly release it
 404  * @orig_entry: tt orig entry to be free'd
 405  */
 406 static void
 407 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
 408 {
 409         kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
 410 }
 411
 412 /**
 413  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 414  * @bat_priv: the bat priv with all the soft interface information
 415  * @tt_local_entry: the TT entry involved in the event
 416  * @event_flags: flags to store in the event structure
 417  */
 418 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 419                                   struct batadv_tt_local_entry *tt_local_entry,
 420                                   u8 event_flags)
 421 {
 422         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 423         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 424         u8 flags = common->flags | event_flags;
 425         bool event_removed = false;
 426         bool del_op_requested, del_op_entry;
 427
 428         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 429         if (!tt_change_node)
 430                 return;
 431
 432         tt_change_node->change.flags = flags;
 433         memset(tt_change_node->change.reserved, 0,
 434                sizeof(tt_change_node->change.reserved));
 435         ether_addr_copy(tt_change_node->change.addr, common->addr);
 436         tt_change_node->change.vid = htons(common->vid);
 437
 438         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 439
 440         /* check for ADD+DEL or DEL+ADD events */
 441         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 442         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 443                                  list) {
 444                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 445                         continue;
 446
 447                 /* DEL+ADD in the same orig interval have no effect and can be
 448                  * removed to avoid silly behaviour on the receiver side. The
 449                  * other way around (ADD+DEL) can happen in case of roaming of
 450                  * a client still in the NEW state. Roaming of NEW clients is
 451                  * now possible due to automatically recognition of "temporary"
 452                  * clients
 453                  */
 454                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 455                 if (!del_op_requested && del_op_entry)
 456                         goto del;
 457                 if (del_op_requested && !del_op_entry)
 458                         goto del;
 459
 460                 /* this is a second add in the same originator interval. It
 461                  * means that flags have been changed: update them!
 462                  */
 463                 if (!del_op_requested && !del_op_entry)
 464                         entry->change.flags = flags;
 465
 466                 continue;
 467 del:
 468                 list_del(&entry->list);
 469                 kfree(entry);
 470                 kfree(tt_change_node);
 471                 event_removed = true;
 472                 goto unlock;
 473         }
 474
 475         /* track the change in the OGMinterval list */
 476         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 477
 478 unlock:
 479         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 480
 481         if (event_removed)
 482                 atomic_dec(&bat_priv->tt.local_changes);
 483         else
 484                 atomic_inc(&bat_priv->tt.local_changes);
 485 }
 486
 487 /**
 488  * batadv_tt_len - compute length in bytes of given number of tt changes
 489  * @changes_num: number of tt changes
 490  *
 491  * Return: computed length in bytes.
 492  */
 493 static int batadv_tt_len(int changes_num)
 494 {
 495         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 496 }
 497
 498 /**
 499  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 500  * @tt_len: available space
 501  *
 502  * Return: the number of entries.
 503  */
 504 static u16 batadv_tt_entries(u16 tt_len)
 505 {
 506         return tt_len / batadv_tt_len(1);
 507 }
 508
 509 /**
 510  * batadv_tt_local_table_transmit_size - calculates the local translation table
 511  *  size when transmitted over the air
 512  * @bat_priv: the bat priv with all the soft interface information
 513  *
 514  * Return: local translation table size in bytes.
 515  */
 516 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 517 {
 518         u16 num_vlan = 0;
 519         u16 tt_local_entries = 0;
 520         struct batadv_softif_vlan *vlan;
 521         int hdr_size;
 522
 523         rcu_read_lock();
 524         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 525                 num_vlan++;
 526                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 527         }
 528         rcu_read_unlock();
 529
 530         /* header size of tvlv encapsulated tt response payload */
 531         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 532         hdr_size += sizeof(struct batadv_tvlv_hdr);
 533         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 534         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 535
 536         return hdr_size + batadv_tt_len(tt_local_entries);
 537 }
 538
 539 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 540 {
 541         if (bat_priv->tt.local_hash)
 542                 return 0;
 543
 544         bat_priv->tt.local_hash = batadv_hash_new(1024);
 545
 546         if (!bat_priv->tt.local_hash)
 547                 return -ENOMEM;
 548
 549         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 550                                    &batadv_tt_local_hash_lock_class_key);
 551
 552         return 0;
 553 }
 554
 555 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 556                                   struct batadv_tt_global_entry *tt_global,
 557                                   const char *message)
 558 {
 559         batadv_dbg(BATADV_DBG_TT, bat_priv,
 560                    "Deleting global tt entry %pM (vid: %d): %s\n",
 561                    tt_global->common.addr,
 562                    BATADV_PRINT_VID(tt_global->common.vid), message);
 563
 564         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 565                            batadv_choose_tt, &tt_global->common);
 566         batadv_tt_global_entry_put(tt_global);
 567 }
 568
 569 /**
 570  * batadv_tt_local_add - add a new client to the local table or update an
 571  *  existing client
 572  * @soft_iface: netdev struct of the mesh interface
 573  * @addr: the mac address of the client to add
 574  * @vid: VLAN identifier
 575  * @ifindex: index of the interface where the client is connected to (useful to
 576  *  identify wireless clients)
 577  * @mark: the value contained in the skb->mark field of the received packet (if
 578  *  any)
 579  *
 580  * Return: true if the client was successfully added, false otherwise.
 581  */
 582 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
 583                          unsigned short vid, int ifindex, u32 mark)
 584 {
 585         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 586         struct batadv_tt_local_entry *tt_local;
 587         struct batadv_tt_global_entry *tt_global = NULL;
 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(&init_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_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
1014                    "Flags", "Last seen", "CRC");
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_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1684                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1685                    "CRC", "Flags");
1686
1687         for (i = 0; i < hash->size; i++) {
1688                 head = &hash->table[i];
1689
1690                 rcu_read_lock();
1691                 hlist_for_each_entry_rcu(tt_common_entry,
1692                                          head, hash_entry) {
1693                         tt_global = container_of(tt_common_entry,
1694                                                  struct batadv_tt_global_entry,
1695                                                  common);
1696                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1697                 }
1698                 rcu_read_unlock();
1699         }
1700 out:
1701         if (primary_if)
1702                 batadv_hardif_put(primary_if);
1703         return 0;
1704 }
1705
1706 /**
1707  * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1708  * @tt_global_entry: the global entry to remove the orig_entry from
1709  * @orig_entry: the orig entry to remove and free
1710  *
1711  * Remove an orig_entry from its list in the given tt_global_entry and
1712  * free this orig_entry afterwards.
1713  *
1714  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1715  * part of a list.
1716  */
1717 static void
1718 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1719                                  struct batadv_tt_orig_list_entry *orig_entry)
1720 {
1721         lockdep_assert_held(&tt_global_entry->list_lock);
1722
1723         batadv_tt_global_size_dec(orig_entry->orig_node,
1724                                   tt_global_entry->common.vid);
1725         atomic_dec(&tt_global_entry->orig_list_count);
1726         /* requires holding tt_global_entry->list_lock and orig_entry->list
1727          * being part of a list
1728          */
1729         hlist_del_rcu(&orig_entry->list);
1730         batadv_tt_orig_list_entry_put(orig_entry);
1731 }
1732
1733 /* deletes the orig list of a tt_global_entry */
1734 static void
1735 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1736 {
1737         struct hlist_head *head;
1738         struct hlist_node *safe;
1739         struct batadv_tt_orig_list_entry *orig_entry;
1740
1741         spin_lock_bh(&tt_global_entry->list_lock);
1742         head = &tt_global_entry->orig_list;
1743         hlist_for_each_entry_safe(orig_entry, safe, head, list)
1744                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1745         spin_unlock_bh(&tt_global_entry->list_lock);
1746 }
1747
1748 /**
1749  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1750  * @bat_priv: the bat priv with all the soft interface information
1751  * @tt_global_entry: the global entry to remove the orig_node from
1752  * @orig_node: the originator announcing the client
1753  * @message: message to append to the log on deletion
1754  *
1755  * Remove the given orig_node and its according orig_entry from the given
1756  * global tt entry.
1757  */
1758 static void
1759 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1760                                struct batadv_tt_global_entry *tt_global_entry,
1761                                struct batadv_orig_node *orig_node,
1762                                const char *message)
1763 {
1764         struct hlist_head *head;
1765         struct hlist_node *safe;
1766         struct batadv_tt_orig_list_entry *orig_entry;
1767         unsigned short vid;
1768
1769         spin_lock_bh(&tt_global_entry->list_lock);
1770         head = &tt_global_entry->orig_list;
1771         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1772                 if (orig_entry->orig_node == orig_node) {
1773                         vid = tt_global_entry->common.vid;
1774                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1775                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1776                                    orig_node->orig,
1777                                    tt_global_entry->common.addr,
1778                                    BATADV_PRINT_VID(vid), message);
1779                         _batadv_tt_global_del_orig_entry(tt_global_entry,
1780                                                          orig_entry);
1781                 }
1782         }
1783         spin_unlock_bh(&tt_global_entry->list_lock);
1784 }
1785
1786 /* If the client is to be deleted, we check if it is the last origantor entry
1787  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1788  * timer, otherwise we simply remove the originator scheduled for deletion.
1789  */
1790 static void
1791 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1792                              struct batadv_tt_global_entry *tt_global_entry,
1793                              struct batadv_orig_node *orig_node,
1794                              const char *message)
1795 {
1796         bool last_entry = true;
1797         struct hlist_head *head;
1798         struct batadv_tt_orig_list_entry *orig_entry;
1799
1800         /* no local entry exists, case 1:
1801          * Check if this is the last one or if other entries exist.
1802          */
1803
1804         rcu_read_lock();
1805         head = &tt_global_entry->orig_list;
1806         hlist_for_each_entry_rcu(orig_entry, head, list) {
1807                 if (orig_entry->orig_node != orig_node) {
1808                         last_entry = false;
1809                         break;
1810                 }
1811         }
1812         rcu_read_unlock();
1813
1814         if (last_entry) {
1815                 /* its the last one, mark for roaming. */
1816                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1817                 tt_global_entry->roam_at = jiffies;
1818         } else
1819                 /* there is another entry, we can simply delete this
1820                  * one and can still use the other one.
1821                  */
1822                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1823                                                orig_node, message);
1824 }
1825
1826 /**
1827  * batadv_tt_global_del - remove a client from the global table
1828  * @bat_priv: the bat priv with all the soft interface information
1829  * @orig_node: an originator serving this client
1830  * @addr: the mac address of the client
1831  * @vid: VLAN identifier
1832  * @message: a message explaining the reason for deleting the client to print
1833  *  for debugging purpose
1834  * @roaming: true if the deletion has been triggered by a roaming event
1835  */
1836 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1837                                  struct batadv_orig_node *orig_node,
1838                                  const unsigned char *addr, unsigned short vid,
1839                                  const char *message, bool roaming)
1840 {
1841         struct batadv_tt_global_entry *tt_global_entry;
1842         struct batadv_tt_local_entry *local_entry = NULL;
1843
1844         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1845         if (!tt_global_entry)
1846                 goto out;
1847
1848         if (!roaming) {
1849                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1850                                                orig_node, message);
1851
1852                 if (hlist_empty(&tt_global_entry->orig_list))
1853                         batadv_tt_global_free(bat_priv, tt_global_entry,
1854                                               message);
1855
1856                 goto out;
1857         }
1858
1859         /* if we are deleting a global entry due to a roam
1860          * event, there are two possibilities:
1861          * 1) the client roamed from node A to node B => if there
1862          *    is only one originator left for this client, we mark
1863          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1864          *    wait for node B to claim it. In case of timeout
1865          *    the entry is purged.
1866          *
1867          *    If there are other originators left, we directly delete
1868          *    the originator.
1869          * 2) the client roamed to us => we can directly delete
1870          *    the global entry, since it is useless now.
1871          */
1872         local_entry = batadv_tt_local_hash_find(bat_priv,
1873                                                 tt_global_entry->common.addr,
1874                                                 vid);
1875         if (local_entry) {
1876                 /* local entry exists, case 2: client roamed to us. */
1877                 batadv_tt_global_del_orig_list(tt_global_entry);
1878                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1879         } else
1880                 /* no local entry exists, case 1: check for roaming */
1881                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1882                                              orig_node, message);
1883
1884 out:
1885         if (tt_global_entry)
1886                 batadv_tt_global_entry_put(tt_global_entry);
1887         if (local_entry)
1888                 batadv_tt_local_entry_put(local_entry);
1889 }
1890
1891 /**
1892  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1893  *  given originator matching the provided vid
1894  * @bat_priv: the bat priv with all the soft interface information
1895  * @orig_node: the originator owning the entries to remove
1896  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1897  *  removed
1898  * @message: debug message to print as "reason"
1899  */
1900 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1901                                struct batadv_orig_node *orig_node,
1902                                s32 match_vid,
1903                                const char *message)
1904 {
1905         struct batadv_tt_global_entry *tt_global;
1906         struct batadv_tt_common_entry *tt_common_entry;
1907         u32 i;
1908         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1909         struct hlist_node *safe;
1910         struct hlist_head *head;
1911         spinlock_t *list_lock; /* protects write access to the hash lists */
1912         unsigned short vid;
1913
1914         if (!hash)
1915                 return;
1916
1917         for (i = 0; i < hash->size; i++) {
1918                 head = &hash->table[i];
1919                 list_lock = &hash->list_locks[i];
1920
1921                 spin_lock_bh(list_lock);
1922                 hlist_for_each_entry_safe(tt_common_entry, safe,
1923                                           head, hash_entry) {
1924                         /* remove only matching entries */
1925                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1926                                 continue;
1927
1928                         tt_global = container_of(tt_common_entry,
1929                                                  struct batadv_tt_global_entry,
1930                                                  common);
1931
1932                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
1933                                                        orig_node, message);
1934
1935                         if (hlist_empty(&tt_global->orig_list)) {
1936                                 vid = tt_global->common.vid;
1937                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1938                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1939                                            tt_global->common.addr,
1940                                            BATADV_PRINT_VID(vid), message);
1941                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1942                                 batadv_tt_global_entry_put(tt_global);
1943                         }
1944                 }
1945                 spin_unlock_bh(list_lock);
1946         }
1947         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1948 }
1949
1950 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1951                                       char **msg)
1952 {
1953         bool purge = false;
1954         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1955         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1956
1957         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1958             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1959                 purge = true;
1960                 *msg = "Roaming timeout\n";
1961         }
1962
1963         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1964             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1965                 purge = true;
1966                 *msg = "Temporary client timeout\n";
1967         }
1968
1969         return purge;
1970 }
1971
1972 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1973 {
1974         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1975         struct hlist_head *head;
1976         struct hlist_node *node_tmp;
1977         spinlock_t *list_lock; /* protects write access to the hash lists */
1978         u32 i;
1979         char *msg = NULL;
1980         struct batadv_tt_common_entry *tt_common;
1981         struct batadv_tt_global_entry *tt_global;
1982
1983         for (i = 0; i < hash->size; i++) {
1984                 head = &hash->table[i];
1985                 list_lock = &hash->list_locks[i];
1986
1987                 spin_lock_bh(list_lock);
1988                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1989                                           hash_entry) {
1990                         tt_global = container_of(tt_common,
1991                                                  struct batadv_tt_global_entry,
1992                                                  common);
1993
1994                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1995                                 continue;
1996
1997                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1998                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1999                                    tt_global->common.addr,
2000                                    BATADV_PRINT_VID(tt_global->common.vid),
2001                                    msg);
2002
2003                         hlist_del_rcu(&tt_common->hash_entry);
2004
2005                         batadv_tt_global_entry_put(tt_global);
2006                 }
2007                 spin_unlock_bh(list_lock);
2008         }
2009 }
2010
2011 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2012 {
2013         struct batadv_hashtable *hash;
2014         spinlock_t *list_lock; /* protects write access to the hash lists */
2015         struct batadv_tt_common_entry *tt_common_entry;
2016         struct batadv_tt_global_entry *tt_global;
2017         struct hlist_node *node_tmp;
2018         struct hlist_head *head;
2019         u32 i;
2020
2021         if (!bat_priv->tt.global_hash)
2022                 return;
2023
2024         hash = bat_priv->tt.global_hash;
2025
2026         for (i = 0; i < hash->size; i++) {
2027                 head = &hash->table[i];
2028                 list_lock = &hash->list_locks[i];
2029
2030                 spin_lock_bh(list_lock);
2031                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2032                                           head, hash_entry) {
2033                         hlist_del_rcu(&tt_common_entry->hash_entry);
2034                         tt_global = container_of(tt_common_entry,
2035                                                  struct batadv_tt_global_entry,
2036                                                  common);
2037                         batadv_tt_global_entry_put(tt_global);
2038                 }
2039                 spin_unlock_bh(list_lock);
2040         }
2041
2042         batadv_hash_destroy(hash);
2043
2044         bat_priv->tt.global_hash = NULL;
2045 }
2046
2047 static bool
2048 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2049                        struct batadv_tt_global_entry *tt_global_entry)
2050 {
2051         bool ret = false;
2052
2053         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2054             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2055                 ret = true;
2056
2057         /* check if the two clients are marked as isolated */
2058         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2059             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2060                 ret = true;
2061
2062         return ret;
2063 }
2064
2065 /**
2066  * batadv_transtable_search - get the mesh destination for a given client
2067  * @bat_priv: the bat priv with all the soft interface information
2068  * @src: mac address of the source client
2069  * @addr: mac address of the destination client
2070  * @vid: VLAN identifier
2071  *
2072  * Return: a pointer to the originator that was selected as destination in the
2073  * mesh for contacting the client 'addr', NULL otherwise.
2074  * In case of multiple originators serving the same client, the function returns
2075  * the best one (best in terms of metric towards the destination node).
2076  *
2077  * If the two clients are AP isolated the function returns NULL.
2078  */
2079 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2080                                                   const u8 *src,
2081                                                   const u8 *addr,
2082                                                   unsigned short vid)
2083 {
2084         struct batadv_tt_local_entry *tt_local_entry = NULL;
2085         struct batadv_tt_global_entry *tt_global_entry = NULL;
2086         struct batadv_orig_node *orig_node = NULL;
2087         struct batadv_tt_orig_list_entry *best_entry;
2088
2089         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2090                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2091                 if (!tt_local_entry ||
2092                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2093                         goto out;
2094         }
2095
2096         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2097         if (!tt_global_entry)
2098                 goto out;
2099
2100         /* check whether the clients should not communicate due to AP
2101          * isolation
2102          */
2103         if (tt_local_entry &&
2104             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2105                 goto out;
2106
2107         rcu_read_lock();
2108         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2109         /* found anything? */
2110         if (best_entry)
2111                 orig_node = best_entry->orig_node;
2112         if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2113                 orig_node = NULL;
2114         rcu_read_unlock();
2115
2116 out:
2117         if (tt_global_entry)
2118                 batadv_tt_global_entry_put(tt_global_entry);
2119         if (tt_local_entry)
2120                 batadv_tt_local_entry_put(tt_local_entry);
2121
2122         return orig_node;
2123 }
2124
2125 /**
2126  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2127  *  to the given orig_node
2128  * @bat_priv: the bat priv with all the soft interface information
2129  * @orig_node: originator for which the CRC should be computed
2130  * @vid: VLAN identifier for which the CRC32 has to be computed
2131  *
2132  * This function computes the checksum for the global table corresponding to a
2133  * specific originator. In particular, the checksum is computed as follows: For
2134  * each client connected to the originator the CRC32C of the MAC address and the
2135  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2136  * together.
2137  *
2138  * The idea behind is that CRC32C should be used as much as possible in order to
2139  * produce a unique hash of the table, but since the order which is used to feed
2140  * the CRC32C function affects the result and since every node in the network
2141  * probably sorts the clients differently, the hash function cannot be directly
2142  * computed over the entire table. Hence the CRC32C is used only on
2143  * the single client entry, while all the results are then xor'ed together
2144  * because the XOR operation can combine them all while trying to reduce the
2145  * noise as much as possible.
2146  *
2147  * Return: the checksum of the global table of a given originator.
2148  */
2149 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2150                                 struct batadv_orig_node *orig_node,
2151                                 unsigned short vid)
2152 {
2153         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2154         struct batadv_tt_common_entry *tt_common;
2155         struct batadv_tt_global_entry *tt_global;
2156         struct hlist_head *head;
2157         u32 i, crc_tmp, crc = 0;
2158         u8 flags;
2159         __be16 tmp_vid;
2160
2161         for (i = 0; i < hash->size; i++) {
2162                 head = &hash->table[i];
2163
2164                 rcu_read_lock();
2165                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2166                         tt_global = container_of(tt_common,
2167                                                  struct batadv_tt_global_entry,
2168                                                  common);
2169                         /* compute the CRC only for entries belonging to the
2170                          * VLAN identified by the vid passed as parameter
2171                          */
2172                         if (tt_common->vid != vid)
2173                                 continue;
2174
2175                         /* Roaming clients are in the global table for
2176                          * consistency only. They don't have to be
2177                          * taken into account while computing the
2178                          * global crc
2179                          */
2180                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2181                                 continue;
2182                         /* Temporary clients have not been announced yet, so
2183                          * they have to be skipped while computing the global
2184                          * crc
2185                          */
2186                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2187                                 continue;
2188
2189                         /* find out if this global entry is announced by this
2190                          * originator
2191                          */
2192                         if (!batadv_tt_global_entry_has_orig(tt_global,
2193                                                              orig_node))
2194                                 continue;
2195
2196                         /* use network order to read the VID: this ensures that
2197                          * every node reads the bytes in the same order.
2198                          */
2199                         tmp_vid = htons(tt_common->vid);
2200                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2201
2202                         /* compute the CRC on flags that have to be kept in sync
2203                          * among nodes
2204                          */
2205                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2206                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2207
2208                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2209                 }
2210                 rcu_read_unlock();
2211         }
2212
2213         return crc;
2214 }
2215
2216 /**
2217  * batadv_tt_local_crc - calculates the checksum of the local table
2218  * @bat_priv: the bat priv with all the soft interface information
2219  * @vid: VLAN identifier for which the CRC32 has to be computed
2220  *
2221  * For details about the computation, please refer to the documentation for
2222  * batadv_tt_global_crc().
2223  *
2224  * Return: the checksum of the local table
2225  */
2226 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2227                                unsigned short vid)
2228 {
2229         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2230         struct batadv_tt_common_entry *tt_common;
2231         struct hlist_head *head;
2232         u32 i, crc_tmp, crc = 0;
2233         u8 flags;
2234         __be16 tmp_vid;
2235
2236         for (i = 0; i < hash->size; i++) {
2237                 head = &hash->table[i];
2238
2239                 rcu_read_lock();
2240                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2241                         /* compute the CRC only for entries belonging to the
2242                          * VLAN identified by vid
2243                          */
2244                         if (tt_common->vid != vid)
2245                                 continue;
2246
2247                         /* not yet committed clients have not to be taken into
2248                          * account while computing the CRC
2249                          */
2250                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2251                                 continue;
2252
2253                         /* use network order to read the VID: this ensures that
2254                          * every node reads the bytes in the same order.
2255                          */
2256                         tmp_vid = htons(tt_common->vid);
2257                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2258
2259                         /* compute the CRC on flags that have to be kept in sync
2260                          * among nodes
2261                          */
2262                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2263                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2264
2265                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2266                 }
2267                 rcu_read_unlock();
2268         }
2269
2270         return crc;
2271 }
2272
2273 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2274 {
2275         struct batadv_tt_req_node *node;
2276         struct hlist_node *safe;
2277
2278         spin_lock_bh(&bat_priv->tt.req_list_lock);
2279
2280         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2281                 hlist_del_init(&node->list);
2282                 kfree(node);
2283         }
2284
2285         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2286 }
2287
2288 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2289                                        struct batadv_orig_node *orig_node,
2290                                        const void *tt_buff,
2291                                        u16 tt_buff_len)
2292 {
2293         /* Replace the old buffer only if I received something in the
2294          * last OGM (the OGM could carry no changes)
2295          */
2296         spin_lock_bh(&orig_node->tt_buff_lock);
2297         if (tt_buff_len > 0) {
2298                 kfree(orig_node->tt_buff);
2299                 orig_node->tt_buff_len = 0;
2300                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2301                 if (orig_node->tt_buff) {
2302                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2303                         orig_node->tt_buff_len = tt_buff_len;
2304                 }
2305         }
2306         spin_unlock_bh(&orig_node->tt_buff_lock);
2307 }
2308
2309 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2310 {
2311         struct batadv_tt_req_node *node;
2312         struct hlist_node *safe;
2313
2314         spin_lock_bh(&bat_priv->tt.req_list_lock);
2315         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2316                 if (batadv_has_timed_out(node->issued_at,
2317                                          BATADV_TT_REQUEST_TIMEOUT)) {
2318                         hlist_del_init(&node->list);
2319                         kfree(node);
2320                 }
2321         }
2322         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2323 }
2324
2325 /**
2326  * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2327  * @bat_priv: the bat priv with all the soft interface information
2328  * @orig_node: orig node this request is being issued for
2329  *
2330  * Return: the pointer to the new tt_req_node struct if no request
2331  * has already been issued for this orig_node, NULL otherwise.
2332  */
2333 static struct batadv_tt_req_node *
2334 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2335                        struct batadv_orig_node *orig_node)
2336 {
2337         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2338
2339         spin_lock_bh(&bat_priv->tt.req_list_lock);
2340         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2341                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2342                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2343                                           BATADV_TT_REQUEST_TIMEOUT))
2344                         goto unlock;
2345         }
2346
2347         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2348         if (!tt_req_node)
2349                 goto unlock;
2350
2351         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2352         tt_req_node->issued_at = jiffies;
2353
2354         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2355 unlock:
2356         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2357         return tt_req_node;
2358 }
2359
2360 /**
2361  * batadv_tt_local_valid - verify that given tt entry is a valid one
2362  * @entry_ptr: to be checked local tt entry
2363  * @data_ptr: not used but definition required to satisfy the callback prototype
2364  *
2365  * Return: 1 if the entry is a valid, 0 otherwise.
2366  */
2367 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2368 {
2369         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2370
2371         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2372                 return 0;
2373         return 1;
2374 }
2375
2376 static int batadv_tt_global_valid(const void *entry_ptr,
2377                                   const void *data_ptr)
2378 {
2379         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2380         const struct batadv_tt_global_entry *tt_global_entry;
2381         const struct batadv_orig_node *orig_node = data_ptr;
2382
2383         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2384             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2385                 return 0;
2386
2387         tt_global_entry = container_of(tt_common_entry,
2388                                        struct batadv_tt_global_entry,
2389                                        common);
2390
2391         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2392 }
2393
2394 /**
2395  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2396  *  specified tt hash
2397  * @bat_priv: the bat priv with all the soft interface information
2398  * @hash: hash table containing the tt entries
2399  * @tt_len: expected tvlv tt data buffer length in number of bytes
2400  * @tvlv_buff: pointer to the buffer to fill with the TT data
2401  * @valid_cb: function to filter tt change entries
2402  * @cb_data: data passed to the filter function as argument
2403  */
2404 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2405                                     struct batadv_hashtable *hash,
2406                                     void *tvlv_buff, u16 tt_len,
2407                                     int (*valid_cb)(const void *, const void *),
2408                                     void *cb_data)
2409 {
2410         struct batadv_tt_common_entry *tt_common_entry;
2411         struct batadv_tvlv_tt_change *tt_change;
2412         struct hlist_head *head;
2413         u16 tt_tot, tt_num_entries = 0;
2414         u32 i;
2415
2416         tt_tot = batadv_tt_entries(tt_len);
2417         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2418
2419         rcu_read_lock();
2420         for (i = 0; i < hash->size; i++) {
2421                 head = &hash->table[i];
2422
2423                 hlist_for_each_entry_rcu(tt_common_entry,
2424                                          head, hash_entry) {
2425                         if (tt_tot == tt_num_entries)
2426                                 break;
2427
2428                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2429                                 continue;
2430
2431                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2432                         tt_change->flags = tt_common_entry->flags;
2433                         tt_change->vid = htons(tt_common_entry->vid);
2434                         memset(tt_change->reserved, 0,
2435                                sizeof(tt_change->reserved));
2436
2437                         tt_num_entries++;
2438                         tt_change++;
2439                 }
2440         }
2441         rcu_read_unlock();
2442 }
2443
2444 /**
2445  * batadv_tt_global_check_crc - check if all the CRCs are correct
2446  * @orig_node: originator for which the CRCs have to be checked
2447  * @tt_vlan: pointer to the first tvlv VLAN entry
2448  * @num_vlan: number of tvlv VLAN entries
2449  *
2450  * Return: true if all the received CRCs match the locally stored ones, false
2451  * otherwise
2452  */
2453 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2454                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2455                                        u16 num_vlan)
2456 {
2457         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2458         struct batadv_orig_node_vlan *vlan;
2459         int i, orig_num_vlan;
2460         u32 crc;
2461
2462         /* check if each received CRC matches the locally stored one */
2463         for (i = 0; i < num_vlan; i++) {
2464                 tt_vlan_tmp = tt_vlan + i;
2465
2466                 /* if orig_node is a backbone node for this VLAN, don't check
2467                  * the CRC as we ignore all the global entries over it
2468                  */
2469                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2470                                                    orig_node->orig,
2471                                                    ntohs(tt_vlan_tmp->vid)))
2472                         continue;
2473
2474                 vlan = batadv_orig_node_vlan_get(orig_node,
2475                                                  ntohs(tt_vlan_tmp->vid));
2476                 if (!vlan)
2477                         return false;
2478
2479                 crc = vlan->tt.crc;
2480                 batadv_orig_node_vlan_put(vlan);
2481
2482                 if (crc != ntohl(tt_vlan_tmp->crc))
2483                         return false;
2484         }
2485
2486         /* check if any excess VLANs exist locally for the originator
2487          * which are not mentioned in the TVLV from the originator.
2488          */
2489         rcu_read_lock();
2490         orig_num_vlan = 0;
2491         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2492                 orig_num_vlan++;
2493         rcu_read_unlock();
2494
2495         if (orig_num_vlan > num_vlan)
2496                 return false;
2497
2498         return true;
2499 }
2500
2501 /**
2502  * batadv_tt_local_update_crc - update all the local CRCs
2503  * @bat_priv: the bat priv with all the soft interface information
2504  */
2505 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2506 {
2507         struct batadv_softif_vlan *vlan;
2508
2509         /* recompute the global CRC for each VLAN */
2510         rcu_read_lock();
2511         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2512                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2513         }
2514         rcu_read_unlock();
2515 }
2516
2517 /**
2518  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2519  * @bat_priv: the bat priv with all the soft interface information
2520  * @orig_node: the orig_node for which the CRCs have to be updated
2521  */
2522 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2523                                         struct batadv_orig_node *orig_node)
2524 {
2525         struct batadv_orig_node_vlan *vlan;
2526         u32 crc;
2527
2528         /* recompute the global CRC for each VLAN */
2529         rcu_read_lock();
2530         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2531                 /* if orig_node is a backbone node for this VLAN, don't compute
2532                  * the CRC as we ignore all the global entries over it
2533                  */
2534                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2535                                                    vlan->vid))
2536                         continue;
2537
2538                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2539                 vlan->tt.crc = crc;
2540         }
2541         rcu_read_unlock();
2542 }
2543
2544 /**
2545  * batadv_send_tt_request - send a TT Request message to a given node
2546  * @bat_priv: the bat priv with all the soft interface information
2547  * @dst_orig_node: the destination of the message
2548  * @ttvn: the version number that the source of the message is looking for
2549  * @tt_vlan: pointer to the first tvlv VLAN object to request
2550  * @num_vlan: number of tvlv VLAN entries
2551  * @full_table: ask for the entire translation table if true, while only for the
2552  *  last TT diff otherwise
2553  *
2554  * Return: true if the TT Request was sent, false otherwise
2555  */
2556 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2557                                   struct batadv_orig_node *dst_orig_node,
2558                                   u8 ttvn,
2559                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2560                                   u16 num_vlan, bool full_table)
2561 {
2562         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2563         struct batadv_tt_req_node *tt_req_node = NULL;
2564         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2565         struct batadv_hard_iface *primary_if;
2566         bool ret = false;
2567         int i, size;
2568
2569         primary_if = batadv_primary_if_get_selected(bat_priv);
2570         if (!primary_if)
2571                 goto out;
2572
2573         /* The new tt_req will be issued only if I'm not waiting for a
2574          * reply from the same orig_node yet
2575          */
2576         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2577         if (!tt_req_node)
2578                 goto out;
2579
2580         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2581         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2582         if (!tvlv_tt_data)
2583                 goto out;
2584
2585         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2586         tvlv_tt_data->ttvn = ttvn;
2587         tvlv_tt_data->num_vlan = htons(num_vlan);
2588
2589         /* send all the CRCs within the request. This is needed by intermediate
2590          * nodes to ensure they have the correct table before replying
2591          */
2592         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2593         for (i = 0; i < num_vlan; i++) {
2594                 tt_vlan_req->vid = tt_vlan->vid;
2595                 tt_vlan_req->crc = tt_vlan->crc;
2596
2597                 tt_vlan_req++;
2598                 tt_vlan++;
2599         }
2600
2601         if (full_table)
2602                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2603
2604         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2605                    dst_orig_node->orig, full_table ? 'F' : '.');
2606
2607         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2608         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2609                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2610                                  tvlv_tt_data, size);
2611         ret = true;
2612
2613 out:
2614         if (primary_if)
2615                 batadv_hardif_put(primary_if);
2616         if (ret && tt_req_node) {
2617                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2618                 /* hlist_del_init() verifies tt_req_node still is in the list */
2619                 hlist_del_init(&tt_req_node->list);
2620                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2621                 kfree(tt_req_node);
2622         }
2623         kfree(tvlv_tt_data);
2624         return ret;
2625 }
2626
2627 /**
2628  * batadv_send_other_tt_response - send reply to tt request concerning another
2629  *  node's translation table
2630  * @bat_priv: the bat priv with all the soft interface information
2631  * @tt_data: tt data containing the tt request information
2632  * @req_src: mac address of tt request sender
2633  * @req_dst: mac address of tt request recipient
2634  *
2635  * Return: true if tt request reply was sent, false otherwise.
2636  */
2637 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2638                                           struct batadv_tvlv_tt_data *tt_data,
2639                                           u8 *req_src, u8 *req_dst)
2640 {
2641         struct batadv_orig_node *req_dst_orig_node;
2642         struct batadv_orig_node *res_dst_orig_node = NULL;
2643         struct batadv_tvlv_tt_change *tt_change;
2644         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2645         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2646         bool ret = false, full_table;
2647         u8 orig_ttvn, req_ttvn;
2648         u16 tvlv_len;
2649         s32 tt_len;
2650
2651         batadv_dbg(BATADV_DBG_TT, bat_priv,
2652                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2653                    req_src, tt_data->ttvn, req_dst,
2654                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2655
2656         /* Let's get the orig node of the REAL destination */
2657         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2658         if (!req_dst_orig_node)
2659                 goto out;
2660
2661         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2662         if (!res_dst_orig_node)
2663                 goto out;
2664
2665         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2666         req_ttvn = tt_data->ttvn;
2667
2668         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2669         /* this node doesn't have the requested data */
2670         if (orig_ttvn != req_ttvn ||
2671             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2672                                         ntohs(tt_data->num_vlan)))
2673                 goto out;
2674
2675         /* If the full table has been explicitly requested */
2676         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2677             !req_dst_orig_node->tt_buff)
2678                 full_table = true;
2679         else
2680                 full_table = false;
2681
2682         /* TT fragmentation hasn't been implemented yet, so send as many
2683          * TT entries fit a single packet as possible only
2684          */
2685         if (!full_table) {
2686                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2687                 tt_len = req_dst_orig_node->tt_buff_len;
2688
2689                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2690                                                               &tvlv_tt_data,
2691                                                               &tt_change,
2692                                                               &tt_len);
2693                 if (!tt_len)
2694                         goto unlock;
2695
2696                 /* Copy the last orig_node's OGM buffer */
2697                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2698                        req_dst_orig_node->tt_buff_len);
2699                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2700         } else {
2701                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2702                  * in the initial part
2703                  */
2704                 tt_len = -1;
2705                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2706                                                               &tvlv_tt_data,
2707                                                               &tt_change,
2708                                                               &tt_len);
2709                 if (!tt_len)
2710                         goto out;
2711
2712                 /* fill the rest of the tvlv with the real TT entries */
2713                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2714                                         tt_change, tt_len,
2715                                         batadv_tt_global_valid,
2716                                         req_dst_orig_node);
2717         }
2718
2719         /* Don't send the response, if larger than fragmented packet. */
2720         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2721         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2722                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2723                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2724                                          res_dst_orig_node->orig);
2725                 goto out;
2726         }
2727
2728         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2729         tvlv_tt_data->ttvn = req_ttvn;
2730
2731         if (full_table)
2732                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2733
2734         batadv_dbg(BATADV_DBG_TT, bat_priv,
2735                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2736                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2737                    full_table ? 'F' : '.', req_ttvn);
2738
2739         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2740
2741         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2742                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2743                                  tvlv_len);
2744
2745         ret = true;
2746         goto out;
2747
2748 unlock:
2749         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2750
2751 out:
2752         if (res_dst_orig_node)
2753                 batadv_orig_node_put(res_dst_orig_node);
2754         if (req_dst_orig_node)
2755                 batadv_orig_node_put(req_dst_orig_node);
2756         kfree(tvlv_tt_data);
2757         return ret;
2758 }
2759
2760 /**
2761  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2762  *  translation table
2763  * @bat_priv: the bat priv with all the soft interface information
2764  * @tt_data: tt data containing the tt request information
2765  * @req_src: mac address of tt request sender
2766  *
2767  * Return: true if tt request reply was sent, false otherwise.
2768  */
2769 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2770                                        struct batadv_tvlv_tt_data *tt_data,
2771                                        u8 *req_src)
2772 {
2773         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2774         struct batadv_hard_iface *primary_if = NULL;
2775         struct batadv_tvlv_tt_change *tt_change;
2776         struct batadv_orig_node *orig_node;
2777         u8 my_ttvn, req_ttvn;
2778         u16 tvlv_len;
2779         bool full_table;
2780         s32 tt_len;
2781
2782         batadv_dbg(BATADV_DBG_TT, bat_priv,
2783                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2784                    req_src, tt_data->ttvn,
2785                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2786
2787         spin_lock_bh(&bat_priv->tt.commit_lock);
2788
2789         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2790         req_ttvn = tt_data->ttvn;
2791
2792         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2793         if (!orig_node)
2794                 goto out;
2795
2796         primary_if = batadv_primary_if_get_selected(bat_priv);
2797         if (!primary_if)
2798                 goto out;
2799
2800         /* If the full table has been explicitly requested or the gap
2801          * is too big send the whole local translation table
2802          */
2803         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2804             !bat_priv->tt.last_changeset)
2805                 full_table = true;
2806         else
2807                 full_table = false;
2808
2809         /* TT fragmentation hasn't been implemented yet, so send as many
2810          * TT entries fit a single packet as possible only
2811          */
2812         if (!full_table) {
2813                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2814
2815                 tt_len = bat_priv->tt.last_changeset_len;
2816                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2817                                                              &tvlv_tt_data,
2818                                                              &tt_change,
2819                                                              &tt_len);
2820                 if (!tt_len)
2821                         goto unlock;
2822
2823                 /* Copy the last orig_node's OGM buffer */
2824                 memcpy(tt_change, bat_priv->tt.last_changeset,
2825                        bat_priv->tt.last_changeset_len);
2826                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2827         } else {
2828                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2829
2830                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2831                  * in the initial part
2832                  */
2833                 tt_len = -1;
2834                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2835                                                              &tvlv_tt_data,
2836                                                              &tt_change,
2837                                                              &tt_len);
2838                 if (!tt_len)
2839                         goto out;
2840
2841                 /* fill the rest of the tvlv with the real TT entries */
2842                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2843                                         tt_change, tt_len,
2844                                         batadv_tt_local_valid, NULL);
2845         }
2846
2847         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2848         tvlv_tt_data->ttvn = req_ttvn;
2849
2850         if (full_table)
2851                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2852
2853         batadv_dbg(BATADV_DBG_TT, bat_priv,
2854                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2855                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2856
2857         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2858
2859         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2860                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2861                                  tvlv_len);
2862
2863         goto out;
2864
2865 unlock:
2866         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2867 out:
2868         spin_unlock_bh(&bat_priv->tt.commit_lock);
2869         if (orig_node)
2870                 batadv_orig_node_put(orig_node);
2871         if (primary_if)
2872                 batadv_hardif_put(primary_if);
2873         kfree(tvlv_tt_data);
2874         /* The packet was for this host, so it doesn't need to be re-routed */
2875         return true;
2876 }
2877
2878 /**
2879  * batadv_send_tt_response - send reply to tt request
2880  * @bat_priv: the bat priv with all the soft interface information
2881  * @tt_data: tt data containing the tt request information
2882  * @req_src: mac address of tt request sender
2883  * @req_dst: mac address of tt request recipient
2884  *
2885  * Return: true if tt request reply was sent, false otherwise.
2886  */
2887 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2888                                     struct batadv_tvlv_tt_data *tt_data,
2889                                     u8 *req_src, u8 *req_dst)
2890 {
2891         if (batadv_is_my_mac(bat_priv, req_dst))
2892                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2893         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2894                                              req_dst);
2895 }
2896
2897 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2898                                       struct batadv_orig_node *orig_node,
2899                                       struct batadv_tvlv_tt_change *tt_change,
2900                                       u16 tt_num_changes, u8 ttvn)
2901 {
2902         int i;
2903         int roams;
2904
2905         for (i = 0; i < tt_num_changes; i++) {
2906                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2907                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2908                         batadv_tt_global_del(bat_priv, orig_node,
2909                                              (tt_change + i)->addr,
2910                                              ntohs((tt_change + i)->vid),
2911                                              "tt removed by changes",
2912                                              roams);
2913                 } else {
2914                         if (!batadv_tt_global_add(bat_priv, orig_node,
2915                                                   (tt_change + i)->addr,
2916                                                   ntohs((tt_change + i)->vid),
2917                                                   (tt_change + i)->flags, ttvn))
2918                                 /* In case of problem while storing a
2919                                  * global_entry, we stop the updating
2920                                  * procedure without committing the
2921                                  * ttvn change. This will avoid to send
2922                                  * corrupted data on tt_request
2923                                  */
2924                                 return;
2925                 }
2926         }
2927         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2928 }
2929
2930 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2931                                   struct batadv_tvlv_tt_change *tt_change,
2932                                   u8 ttvn, u8 *resp_src,
2933                                   u16 num_entries)
2934 {
2935         struct batadv_orig_node *orig_node;
2936
2937         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2938         if (!orig_node)
2939                 goto out;
2940
2941         /* Purge the old table first.. */
2942         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2943                                   "Received full table");
2944
2945         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2946                                   ttvn);
2947
2948         spin_lock_bh(&orig_node->tt_buff_lock);
2949         kfree(orig_node->tt_buff);
2950         orig_node->tt_buff_len = 0;
2951         orig_node->tt_buff = NULL;
2952         spin_unlock_bh(&orig_node->tt_buff_lock);
2953
2954         atomic_set(&orig_node->last_ttvn, ttvn);
2955
2956 out:
2957         if (orig_node)
2958                 batadv_orig_node_put(orig_node);
2959 }
2960
2961 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2962                                      struct batadv_orig_node *orig_node,
2963                                      u16 tt_num_changes, u8 ttvn,
2964                                      struct batadv_tvlv_tt_change *tt_change)
2965 {
2966         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2967                                   tt_num_changes, ttvn);
2968
2969         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2970                                    batadv_tt_len(tt_num_changes));
2971         atomic_set(&orig_node->last_ttvn, ttvn);
2972 }
2973
2974 /**
2975  * batadv_is_my_client - check if a client is served by the local node
2976  * @bat_priv: the bat priv with all the soft interface information
2977  * @addr: the mac address of the client to check
2978  * @vid: VLAN identifier
2979  *
2980  * Return: true if the client is served by this node, false otherwise.
2981  */
2982 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
2983                          unsigned short vid)
2984 {
2985         struct batadv_tt_local_entry *tt_local_entry;
2986         bool ret = false;
2987
2988         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2989         if (!tt_local_entry)
2990                 goto out;
2991         /* Check if the client has been logically deleted (but is kept for
2992          * consistency purpose)
2993          */
2994         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2995             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2996                 goto out;
2997         ret = true;
2998 out:
2999         if (tt_local_entry)
3000                 batadv_tt_local_entry_put(tt_local_entry);
3001         return ret;
3002 }
3003
3004 /**
3005  * batadv_handle_tt_response - process incoming tt reply
3006  * @bat_priv: the bat priv with all the soft interface information
3007  * @tt_data: tt data containing the tt request information
3008  * @resp_src: mac address of tt reply sender
3009  * @num_entries: number of tt change entries appended to the tt data
3010  */
3011 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3012                                       struct batadv_tvlv_tt_data *tt_data,
3013                                       u8 *resp_src, u16 num_entries)
3014 {
3015         struct batadv_tt_req_node *node;
3016         struct hlist_node *safe;
3017         struct batadv_orig_node *orig_node = NULL;
3018         struct batadv_tvlv_tt_change *tt_change;
3019         u8 *tvlv_ptr = (u8 *)tt_data;
3020         u16 change_offset;
3021
3022         batadv_dbg(BATADV_DBG_TT, bat_priv,
3023                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3024                    resp_src, tt_data->ttvn, num_entries,
3025                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3026
3027         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3028         if (!orig_node)
3029                 goto out;
3030
3031         spin_lock_bh(&orig_node->tt_lock);
3032
3033         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3034         change_offset *= ntohs(tt_data->num_vlan);
3035         change_offset += sizeof(*tt_data);
3036         tvlv_ptr += change_offset;
3037
3038         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3039         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3040                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3041                                       resp_src, num_entries);
3042         } else {
3043                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3044                                          tt_data->ttvn, tt_change);
3045         }
3046
3047         /* Recalculate the CRC for this orig_node and store it */
3048         batadv_tt_global_update_crc(bat_priv, orig_node);
3049
3050         spin_unlock_bh(&orig_node->tt_lock);
3051
3052         /* Delete the tt_req_node from pending tt_requests list */
3053         spin_lock_bh(&bat_priv->tt.req_list_lock);
3054         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3055                 if (!batadv_compare_eth(node->addr, resp_src))
3056                         continue;
3057                 hlist_del_init(&node->list);
3058                 kfree(node);
3059         }
3060
3061         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3062 out:
3063         if (orig_node)
3064                 batadv_orig_node_put(orig_node);
3065 }
3066
3067 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3068 {
3069         struct batadv_tt_roam_node *node, *safe;
3070
3071         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3072
3073         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3074                 list_del(&node->list);
3075                 kfree(node);
3076         }
3077
3078         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3079 }
3080
3081 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3082 {
3083         struct batadv_tt_roam_node *node, *safe;
3084
3085         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3086         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3087                 if (!batadv_has_timed_out(node->first_time,
3088                                           BATADV_ROAMING_MAX_TIME))
3089                         continue;
3090
3091                 list_del(&node->list);
3092                 kfree(node);
3093         }
3094         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3095 }
3096
3097 /**
3098  * batadv_tt_check_roam_count - check if a client has roamed too frequently
3099  * @bat_priv: the bat priv with all the soft interface information
3100  * @client: mac address of the roaming client
3101  *
3102  * This function checks whether the client already reached the
3103  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3104  * will not be sent.
3105  *
3106  * Return: true if the ROAMING_ADV can be sent, false otherwise
3107  */
3108 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3109 {
3110         struct batadv_tt_roam_node *tt_roam_node;
3111         bool ret = false;
3112
3113         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3114         /* The new tt_req will be issued only if I'm not waiting for a
3115          * reply from the same orig_node yet
3116          */
3117         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3118                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3119                         continue;
3120
3121                 if (batadv_has_timed_out(tt_roam_node->first_time,
3122                                          BATADV_ROAMING_MAX_TIME))
3123                         continue;
3124
3125                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3126                         /* Sorry, you roamed too many times! */
3127                         goto unlock;
3128                 ret = true;
3129                 break;
3130         }
3131
3132         if (!ret) {
3133                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3134                 if (!tt_roam_node)
3135                         goto unlock;
3136
3137                 tt_roam_node->first_time = jiffies;
3138                 atomic_set(&tt_roam_node->counter,
3139                            BATADV_ROAMING_MAX_COUNT - 1);
3140                 ether_addr_copy(tt_roam_node->addr, client);
3141
3142                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3143                 ret = true;
3144         }
3145
3146 unlock:
3147         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3148         return ret;
3149 }
3150
3151 /**
3152  * batadv_send_roam_adv - send a roaming advertisement message
3153  * @bat_priv: the bat priv with all the soft interface information
3154  * @client: mac address of the roaming client
3155  * @vid: VLAN identifier
3156  * @orig_node: message destination
3157  *
3158  * Send a ROAMING_ADV message to the node which was previously serving this
3159  * client. This is done to inform the node that from now on all traffic destined
3160  * for this particular roamed client has to be forwarded to the sender of the
3161  * roaming message.
3162  */
3163 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3164                                  unsigned short vid,
3165                                  struct batadv_orig_node *orig_node)
3166 {
3167         struct batadv_hard_iface *primary_if;
3168         struct batadv_tvlv_roam_adv tvlv_roam;
3169
3170         primary_if = batadv_primary_if_get_selected(bat_priv);
3171         if (!primary_if)
3172                 goto out;
3173
3174         /* before going on we have to check whether the client has
3175          * already roamed to us too many times
3176          */
3177         if (!batadv_tt_check_roam_count(bat_priv, client))
3178                 goto out;
3179
3180         batadv_dbg(BATADV_DBG_TT, bat_priv,
3181                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3182                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3183
3184         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3185
3186         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3187         tvlv_roam.vid = htons(vid);
3188
3189         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3190                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3191                                  &tvlv_roam, sizeof(tvlv_roam));
3192
3193 out:
3194         if (primary_if)
3195                 batadv_hardif_put(primary_if);
3196 }
3197
3198 static void batadv_tt_purge(struct work_struct *work)
3199 {
3200         struct delayed_work *delayed_work;
3201         struct batadv_priv_tt *priv_tt;
3202         struct batadv_priv *bat_priv;
3203
3204         delayed_work = container_of(work, struct delayed_work, work);
3205         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3206         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3207
3208         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3209         batadv_tt_global_purge(bat_priv);
3210         batadv_tt_req_purge(bat_priv);
3211         batadv_tt_roam_purge(bat_priv);
3212
3213         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3214                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3215 }
3216
3217 void batadv_tt_free(struct batadv_priv *bat_priv)
3218 {
3219         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3220         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3221
3222         cancel_delayed_work_sync(&bat_priv->tt.work);
3223
3224         batadv_tt_local_table_free(bat_priv);
3225         batadv_tt_global_table_free(bat_priv);
3226         batadv_tt_req_list_free(bat_priv);
3227         batadv_tt_changes_list_free(bat_priv);
3228         batadv_tt_roam_list_free(bat_priv);
3229
3230         kfree(bat_priv->tt.last_changeset);
3231 }
3232
3233 /**
3234  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3235  *  table and possibly count them in the TT size
3236  * @bat_priv: the bat priv with all the soft interface information
3237  * @flags: the flag to switch
3238  * @enable: whether to set or unset the flag
3239  * @count: whether to increase the TT size by the number of changed entries
3240  */
3241 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3242                                       bool enable, bool count)
3243 {
3244         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3245         struct batadv_tt_common_entry *tt_common_entry;
3246         u16 changed_num = 0;
3247         struct hlist_head *head;
3248         u32 i;
3249
3250         if (!hash)
3251                 return;
3252
3253         for (i = 0; i < hash->size; i++) {
3254                 head = &hash->table[i];
3255
3256                 rcu_read_lock();
3257                 hlist_for_each_entry_rcu(tt_common_entry,
3258                                          head, hash_entry) {
3259                         if (enable) {
3260                                 if ((tt_common_entry->flags & flags) == flags)
3261                                         continue;
3262                                 tt_common_entry->flags |= flags;
3263                         } else {
3264                                 if (!(tt_common_entry->flags & flags))
3265                                         continue;
3266                                 tt_common_entry->flags &= ~flags;
3267                         }
3268                         changed_num++;
3269
3270                         if (!count)
3271                                 continue;
3272
3273                         batadv_tt_local_size_inc(bat_priv,
3274                                                  tt_common_entry->vid);
3275                 }
3276                 rcu_read_unlock();
3277         }
3278 }
3279
3280 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3281 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3282 {
3283         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3284         struct batadv_tt_common_entry *tt_common;
3285         struct batadv_tt_local_entry *tt_local;
3286         struct hlist_node *node_tmp;
3287         struct hlist_head *head;
3288         spinlock_t *list_lock; /* protects write access to the hash lists */
3289         u32 i;
3290
3291         if (!hash)
3292                 return;
3293
3294         for (i = 0; i < hash->size; i++) {
3295                 head = &hash->table[i];
3296                 list_lock = &hash->list_locks[i];
3297
3298                 spin_lock_bh(list_lock);
3299                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3300                                           hash_entry) {
3301                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3302                                 continue;
3303
3304                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3305                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3306                                    tt_common->addr,
3307                                    BATADV_PRINT_VID(tt_common->vid));
3308
3309                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3310                         hlist_del_rcu(&tt_common->hash_entry);
3311                         tt_local = container_of(tt_common,
3312                                                 struct batadv_tt_local_entry,
3313                                                 common);
3314
3315                         batadv_tt_local_entry_put(tt_local);
3316                 }
3317                 spin_unlock_bh(list_lock);
3318         }
3319 }
3320
3321 /**
3322  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3323  *  which have been queued in the time since the last commit
3324  * @bat_priv: the bat priv with all the soft interface information
3325  *
3326  * Caller must hold tt->commit_lock.
3327  */
3328 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3329 {
3330         lockdep_assert_held(&bat_priv->tt.commit_lock);
3331
3332         /* Update multicast addresses in local translation table */
3333         batadv_mcast_mla_update(bat_priv);
3334
3335         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3336                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3337                         batadv_tt_tvlv_container_update(bat_priv);
3338                 return;
3339         }
3340
3341         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3342
3343         batadv_tt_local_purge_pending_clients(bat_priv);
3344         batadv_tt_local_update_crc(bat_priv);
3345
3346         /* Increment the TTVN only once per OGM interval */
3347         atomic_inc(&bat_priv->tt.vn);
3348         batadv_dbg(BATADV_DBG_TT, bat_priv,
3349                    "Local changes committed, updating to ttvn %u\n",
3350                    (u8)atomic_read(&bat_priv->tt.vn));
3351
3352         /* reset the sending counter */
3353         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3354         batadv_tt_tvlv_container_update(bat_priv);
3355 }
3356
3357 /**
3358  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3359  *  have been queued in the time since the last commit
3360  * @bat_priv: the bat priv with all the soft interface information
3361  */
3362 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3363 {
3364         spin_lock_bh(&bat_priv->tt.commit_lock);
3365         batadv_tt_local_commit_changes_nolock(bat_priv);
3366         spin_unlock_bh(&bat_priv->tt.commit_lock);
3367 }
3368
3369 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3370                            unsigned short vid)
3371 {
3372         struct batadv_tt_local_entry *tt_local_entry = NULL;
3373         struct batadv_tt_global_entry *tt_global_entry = NULL;
3374         struct batadv_softif_vlan *vlan;
3375         bool ret = false;
3376
3377         vlan = batadv_softif_vlan_get(bat_priv, vid);
3378         if (!vlan)
3379                 return false;
3380
3381         if (!atomic_read(&vlan->ap_isolation))
3382                 goto out;
3383
3384         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3385         if (!tt_local_entry)
3386                 goto out;
3387
3388         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3389         if (!tt_global_entry)
3390                 goto out;
3391
3392         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3393                 goto out;
3394
3395         ret = true;
3396
3397 out:
3398         batadv_softif_vlan_put(vlan);
3399         if (tt_global_entry)
3400                 batadv_tt_global_entry_put(tt_global_entry);
3401         if (tt_local_entry)
3402                 batadv_tt_local_entry_put(tt_local_entry);
3403         return ret;
3404 }
3405
3406 /**
3407  * batadv_tt_update_orig - update global translation table with new tt
3408  *  information received via ogms
3409  * @bat_priv: the bat priv with all the soft interface information
3410  * @orig_node: the orig_node of the ogm
3411  * @tt_buff: pointer to the first tvlv VLAN entry
3412  * @tt_num_vlan: number of tvlv VLAN entries
3413  * @tt_change: pointer to the first entry in the TT buffer
3414  * @tt_num_changes: number of tt changes inside the tt buffer
3415  * @ttvn: translation table version number of this changeset
3416  */
3417 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3418                                   struct batadv_orig_node *orig_node,
3419                                   const void *tt_buff, u16 tt_num_vlan,
3420                                   struct batadv_tvlv_tt_change *tt_change,
3421                                   u16 tt_num_changes, u8 ttvn)
3422 {
3423         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3424         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3425         bool full_table = true;
3426         bool has_tt_init;
3427
3428         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3429         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3430                                &orig_node->capa_initialized);
3431
3432         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3433          * increased by one -> we can apply the attached changes
3434          */
3435         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3436                 /* the OGM could not contain the changes due to their size or
3437                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3438                  * times.
3439                  * In this case send a tt request
3440                  */
3441                 if (!tt_num_changes) {
3442                         full_table = false;
3443                         goto request_table;
3444                 }
3445
3446                 spin_lock_bh(&orig_node->tt_lock);
3447
3448                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3449                                          ttvn, tt_change);
3450
3451                 /* Even if we received the precomputed crc with the OGM, we
3452                  * prefer to recompute it to spot any possible inconsistency
3453                  * in the global table
3454                  */
3455                 batadv_tt_global_update_crc(bat_priv, orig_node);
3456
3457                 spin_unlock_bh(&orig_node->tt_lock);
3458
3459                 /* The ttvn alone is not enough to guarantee consistency
3460                  * because a single value could represent different states
3461                  * (due to the wrap around). Thus a node has to check whether
3462                  * the resulting table (after applying the changes) is still
3463                  * consistent or not. E.g. a node could disconnect while its
3464                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3465                  * checking the CRC value is mandatory to detect the
3466                  * inconsistency
3467                  */
3468                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3469                                                 tt_num_vlan))
3470                         goto request_table;
3471         } else {
3472                 /* if we missed more than one change or our tables are not
3473                  * in sync anymore -> request fresh tt data
3474                  */
3475                 if (!has_tt_init || ttvn != orig_ttvn ||
3476                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3477                                                 tt_num_vlan)) {
3478 request_table:
3479                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3480                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3481                                    orig_node->orig, ttvn, orig_ttvn,
3482                                    tt_num_changes);
3483                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3484                                                tt_vlan, tt_num_vlan,
3485                                                full_table);
3486                         return;
3487                 }
3488         }
3489 }
3490
3491 /**
3492  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3493  * @bat_priv: the bat priv with all the soft interface information
3494  * @addr: the mac address of the client to check
3495  * @vid: VLAN identifier
3496  *
3497  * Return: true if we know that the client has moved from its old originator
3498  * to another one. This entry is still kept for consistency purposes and will be
3499  * deleted later by a DEL or because of timeout
3500  */
3501 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3502                                         u8 *addr, unsigned short vid)
3503 {
3504         struct batadv_tt_global_entry *tt_global_entry;
3505         bool ret = false;
3506
3507         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3508         if (!tt_global_entry)
3509                 goto out;
3510
3511         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3512         batadv_tt_global_entry_put(tt_global_entry);
3513 out:
3514         return ret;
3515 }
3516
3517 /**
3518  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3519  * @bat_priv: the bat priv with all the soft interface information
3520  * @addr: the mac address of the local client to query
3521  * @vid: VLAN identifier
3522  *
3523  * Return: true if the local client is known to be roaming (it is not served by
3524  * this node anymore) or not. If yes, the client is still present in the table
3525  * to keep the latter consistent with the node TTVN
3526  */
3527 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3528                                        u8 *addr, unsigned short vid)
3529 {
3530         struct batadv_tt_local_entry *tt_local_entry;
3531         bool ret = false;
3532
3533         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3534         if (!tt_local_entry)
3535                 goto out;
3536
3537         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3538         batadv_tt_local_entry_put(tt_local_entry);
3539 out:
3540         return ret;
3541 }
3542
3543 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3544                                           struct batadv_orig_node *orig_node,
3545                                           const unsigned char *addr,
3546                                           unsigned short vid)
3547 {
3548         bool ret = false;
3549
3550         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3551                                   BATADV_TT_CLIENT_TEMP,
3552                                   atomic_read(&orig_node->last_ttvn)))
3553                 goto out;
3554
3555         batadv_dbg(BATADV_DBG_TT, bat_priv,
3556                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3557                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3558         ret = true;
3559 out:
3560         return ret;
3561 }
3562
3563 /**
3564  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3565  *  maximum packet size that can be transported through the mesh
3566  * @soft_iface: netdev struct of the mesh interface
3567  *
3568  * Remove entries older than 'timeout' and half timeout if more entries need
3569  * to be removed.
3570  */
3571 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3572 {
3573         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3574         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3575         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3576         bool reduced = false;
3577
3578         spin_lock_bh(&bat_priv->tt.commit_lock);
3579
3580         while (true) {
3581                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3582                 if (packet_size_max >= table_size)
3583                         break;
3584
3585                 batadv_tt_local_purge(bat_priv, timeout);
3586                 batadv_tt_local_purge_pending_clients(bat_priv);
3587
3588                 timeout /= 2;
3589                 reduced = true;
3590                 net_ratelimited_function(batadv_info, soft_iface,
3591                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3592                                          packet_size_max);
3593         }
3594
3595         /* commit these changes immediately, to avoid synchronization problem
3596          * with the TTVN
3597          */
3598         if (reduced)
3599                 batadv_tt_local_commit_changes_nolock(bat_priv);
3600
3601         spin_unlock_bh(&bat_priv->tt.commit_lock);
3602 }
3603
3604 /**
3605  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3606  * @bat_priv: the bat priv with all the soft interface information
3607  * @orig: the orig_node of the ogm
3608  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3609  * @tvlv_value: tvlv buffer containing the gateway data
3610  * @tvlv_value_len: tvlv buffer length
3611  */
3612 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3613                                           struct batadv_orig_node *orig,
3614                                           u8 flags, void *tvlv_value,
3615                                           u16 tvlv_value_len)
3616 {
3617         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3618         struct batadv_tvlv_tt_change *tt_change;
3619         struct batadv_tvlv_tt_data *tt_data;
3620         u16 num_entries, num_vlan;
3621
3622         if (tvlv_value_len < sizeof(*tt_data))
3623                 return;
3624
3625         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3626         tvlv_value_len -= sizeof(*tt_data);
3627
3628         num_vlan = ntohs(tt_data->num_vlan);
3629
3630         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3631                 return;
3632
3633         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3634         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3635         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3636
3637         num_entries = batadv_tt_entries(tvlv_value_len);
3638
3639         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3640                               num_entries, tt_data->ttvn);
3641 }
3642
3643 /**
3644  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3645  *  container
3646  * @bat_priv: the bat priv with all the soft interface information
3647  * @src: mac address of tt tvlv sender
3648  * @dst: mac address of tt tvlv recipient
3649  * @tvlv_value: tvlv buffer containing the tt data
3650  * @tvlv_value_len: tvlv buffer length
3651  *
3652  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3653  * otherwise.
3654  */
3655 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3656                                              u8 *src, u8 *dst,
3657                                              void *tvlv_value,
3658                                              u16 tvlv_value_len)
3659 {
3660         struct batadv_tvlv_tt_data *tt_data;
3661         u16 tt_vlan_len, tt_num_entries;
3662         char tt_flag;
3663         bool ret;
3664
3665         if (tvlv_value_len < sizeof(*tt_data))
3666                 return NET_RX_SUCCESS;
3667
3668         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3669         tvlv_value_len -= sizeof(*tt_data);
3670
3671         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3672         tt_vlan_len *= ntohs(tt_data->num_vlan);
3673
3674         if (tvlv_value_len < tt_vlan_len)
3675                 return NET_RX_SUCCESS;
3676
3677         tvlv_value_len -= tt_vlan_len;
3678         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3679
3680         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3681         case BATADV_TT_REQUEST:
3682                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3683
3684                 /* If this node cannot provide a TT response the tt_request is
3685                  * forwarded
3686                  */
3687                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3688                 if (!ret) {
3689                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3690                                 tt_flag = 'F';
3691                         else
3692                                 tt_flag = '.';
3693
3694                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3695                                    "Routing TT_REQUEST to %pM [%c]\n",
3696                                    dst, tt_flag);
3697                         /* tvlv API will re-route the packet */
3698                         return NET_RX_DROP;
3699                 }
3700                 break;
3701         case BATADV_TT_RESPONSE:
3702                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3703
3704                 if (batadv_is_my_mac(bat_priv, dst)) {
3705                         batadv_handle_tt_response(bat_priv, tt_data,
3706                                                   src, tt_num_entries);
3707                         return NET_RX_SUCCESS;
3708                 }
3709
3710                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3711                         tt_flag =  'F';
3712                 else
3713                         tt_flag = '.';
3714
3715                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3716                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3717
3718                 /* tvlv API will re-route the packet */
3719                 return NET_RX_DROP;
3720         }
3721
3722         return NET_RX_SUCCESS;
3723 }
3724
3725 /**
3726  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3727  * @bat_priv: the bat priv with all the soft interface information
3728  * @src: mac address of tt tvlv sender
3729  * @dst: mac address of tt tvlv recipient
3730  * @tvlv_value: tvlv buffer containing the tt data
3731  * @tvlv_value_len: tvlv buffer length
3732  *
3733  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3734  * otherwise.
3735  */
3736 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3737                                                u8 *src, u8 *dst,
3738                                                void *tvlv_value,
3739                                                u16 tvlv_value_len)
3740 {
3741         struct batadv_tvlv_roam_adv *roaming_adv;
3742         struct batadv_orig_node *orig_node = NULL;
3743
3744         /* If this node is not the intended recipient of the
3745          * roaming advertisement the packet is forwarded
3746          * (the tvlv API will re-route the packet).
3747          */
3748         if (!batadv_is_my_mac(bat_priv, dst))
3749                 return NET_RX_DROP;
3750
3751         if (tvlv_value_len < sizeof(*roaming_adv))
3752                 goto out;
3753
3754         orig_node = batadv_orig_hash_find(bat_priv, src);
3755         if (!orig_node)
3756                 goto out;
3757
3758         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3759         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3760
3761         batadv_dbg(BATADV_DBG_TT, bat_priv,
3762                    "Received ROAMING_ADV from %pM (client %pM)\n",
3763                    src, roaming_adv->client);
3764
3765         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3766                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3767                              atomic_read(&orig_node->last_ttvn) + 1);
3768
3769 out:
3770         if (orig_node)
3771                 batadv_orig_node_put(orig_node);
3772         return NET_RX_SUCCESS;
3773 }
3774
3775 /**
3776  * batadv_tt_init - initialise the translation table internals
3777  * @bat_priv: the bat priv with all the soft interface information
3778  *
3779  * Return: 0 on success or negative error number in case of failure.
3780  */
3781 int batadv_tt_init(struct batadv_priv *bat_priv)
3782 {
3783         int ret;
3784
3785         /* synchronized flags must be remote */
3786         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3787
3788         ret = batadv_tt_local_init(bat_priv);
3789         if (ret < 0)
3790                 return ret;
3791
3792         ret = batadv_tt_global_init(bat_priv);
3793         if (ret < 0)
3794                 return ret;
3795
3796         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3797                                      batadv_tt_tvlv_unicast_handler_v1,
3798                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3799
3800         batadv_tvlv_handler_register(bat_priv, NULL,
3801                                      batadv_roam_tvlv_unicast_handler_v1,
3802                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3803
3804         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3805         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3806                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3807
3808         return 1;
3809 }
3810
3811 /**
3812  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3813  * @bat_priv: the bat priv with all the soft interface information
3814  * @addr: the mac address of the client
3815  * @vid: the identifier of the VLAN where this client is connected
3816  *
3817  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
3818  * otherwise
3819  */
3820 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3821                                   const u8 *addr, unsigned short vid)
3822 {
3823         struct batadv_tt_global_entry *tt;
3824         bool ret;
3825
3826         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3827         if (!tt)
3828                 return false;
3829
3830         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3831
3832         batadv_tt_global_entry_put(tt);
3833
3834         return ret;
3835 }