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/cache.h>
  26 #include <linux/compiler.h>
  27 #include <linux/crc32c.h>
  28 #include <linux/errno.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/fs.h>
  31 #include <linux/if_ether.h>
  32 #include <linux/init.h>
  33 #include <linux/jhash.h>
  34 #include <linux/jiffies.h>
  35 #include <linux/kernel.h>
  36 #include <linux/kref.h>
  37 #include <linux/list.h>
  38 #include <linux/lockdep.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/netlink.h>
  41 #include <linux/rculist.h>
  42 #include <linux/rcupdate.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/slab.h>
  46 #include <linux/spinlock.h>
  47 #include <linux/stddef.h>
  48 #include <linux/string.h>
  49 #include <linux/workqueue.h>
  50 #include <net/genetlink.h>
  51 #include <net/netlink.h>
  52 #include <net/sock.h>
  53 #include <uapi/linux/batman_adv.h>
  54
  55 #include "bridge_loop_avoidance.h"
  56 #include "hard-interface.h"
  57 #include "hash.h"
  58 #include "log.h"
  59 #include "multicast.h"
  60 #include "netlink.h"
  61 #include "originator.h"
  62 #include "packet.h"
  63 #include "soft-interface.h"
  64 #include "tvlv.h"
  65
  66 static struct kmem_cache *batadv_tl_cache __read_mostly;
  67 static struct kmem_cache *batadv_tg_cache __read_mostly;
  68 static struct kmem_cache *batadv_tt_orig_cache __read_mostly;
  69 static struct kmem_cache *batadv_tt_change_cache __read_mostly;
  70 static struct kmem_cache *batadv_tt_req_cache __read_mostly;
  71 static struct kmem_cache *batadv_tt_roam_cache __read_mostly;
  72
  73 /* hash class keys */
  74 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  75 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  76
  77 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
  78                                  unsigned short vid,
  79                                  struct batadv_orig_node *orig_node);
  80 static void batadv_tt_purge(struct work_struct *work);
  81 static void
  82 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  83 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  84                                  struct batadv_orig_node *orig_node,
  85                                  const unsigned char *addr,
  86                                  unsigned short vid, const char *message,
  87                                  bool roaming);
  88
  89 /**
  90  * batadv_compare_tt - check if two TT entries are the same
  91  * @node: the list element pointer of the first TT entry
  92  * @data2: pointer to the tt_common_entry of the second TT entry
  93  *
  94  * Compare the MAC address and the VLAN ID of the two TT entries and check if
  95  * they are the same TT client.
  96  * Return: true if the two TT clients are the same, false otherwise
  97  */
  98 static bool batadv_compare_tt(const struct hlist_node *node, const void *data2)
  99 {
 100         const void *data1 = container_of(node, struct batadv_tt_common_entry,
 101                                          hash_entry);
 102         const struct batadv_tt_common_entry *tt1 = data1;
 103         const struct batadv_tt_common_entry *tt2 = data2;
 104
 105         return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
 106 }
 107
 108 /**
 109  * batadv_choose_tt - return the index of the tt entry in the hash table
 110  * @data: pointer to the tt_common_entry object to map
 111  * @size: the size of the hash table
 112  *
 113  * Return: the hash index where the object represented by 'data' should be
 114  * stored at.
 115  */
 116 static inline u32 batadv_choose_tt(const void *data, u32 size)
 117 {
 118         struct batadv_tt_common_entry *tt;
 119         u32 hash = 0;
 120
 121         tt = (struct batadv_tt_common_entry *)data;
 122         hash = jhash(&tt->addr, ETH_ALEN, hash);
 123         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
 124
 125         return hash % size;
 126 }
 127
 128 /**
 129  * batadv_tt_hash_find - look for a client in the given hash table
 130  * @hash: the hash table to search
 131  * @addr: the mac address of the client to look for
 132  * @vid: VLAN identifier
 133  *
 134  * Return: a pointer to the tt_common struct belonging to the searched client if
 135  * found, NULL otherwise.
 136  */
 137 static struct batadv_tt_common_entry *
 138 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
 139                     unsigned short vid)
 140 {
 141         struct hlist_head *head;
 142         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 143         u32 index;
 144
 145         if (!hash)
 146                 return NULL;
 147
 148         ether_addr_copy(to_search.addr, addr);
 149         to_search.vid = vid;
 150
 151         index = batadv_choose_tt(&to_search, hash->size);
 152         head = &hash->table[index];
 153
 154         rcu_read_lock();
 155         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 156                 if (!batadv_compare_eth(tt, addr))
 157                         continue;
 158
 159                 if (tt->vid != vid)
 160                         continue;
 161
 162                 if (!kref_get_unless_zero(&tt->refcount))
 163                         continue;
 164
 165                 tt_tmp = tt;
 166                 break;
 167         }
 168         rcu_read_unlock();
 169
 170         return tt_tmp;
 171 }
 172
 173 /**
 174  * batadv_tt_local_hash_find - search the local table for a given client
 175  * @bat_priv: the bat priv with all the soft interface information
 176  * @addr: the mac address of the client to look for
 177  * @vid: VLAN identifier
 178  *
 179  * Return: a pointer to the corresponding tt_local_entry struct if the client is
 180  * found, NULL otherwise.
 181  */
 182 static struct batadv_tt_local_entry *
 183 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 184                           unsigned short vid)
 185 {
 186         struct batadv_tt_common_entry *tt_common_entry;
 187         struct batadv_tt_local_entry *tt_local_entry = NULL;
 188
 189         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 190                                               vid);
 191         if (tt_common_entry)
 192                 tt_local_entry = container_of(tt_common_entry,
 193                                               struct batadv_tt_local_entry,
 194                                               common);
 195         return tt_local_entry;
 196 }
 197
 198 /**
 199  * batadv_tt_global_hash_find - search the global table for a given client
 200  * @bat_priv: the bat priv with all the soft interface information
 201  * @addr: the mac address of the client to look for
 202  * @vid: VLAN identifier
 203  *
 204  * Return: a pointer to the corresponding tt_global_entry struct if the client
 205  * is found, NULL otherwise.
 206  */
 207 static struct batadv_tt_global_entry *
 208 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 209                            unsigned short vid)
 210 {
 211         struct batadv_tt_common_entry *tt_common_entry;
 212         struct batadv_tt_global_entry *tt_global_entry = NULL;
 213
 214         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 215                                               vid);
 216         if (tt_common_entry)
 217                 tt_global_entry = container_of(tt_common_entry,
 218                                                struct batadv_tt_global_entry,
 219                                                common);
 220         return tt_global_entry;
 221 }
 222
 223 /**
 224  * batadv_tt_local_entry_free_rcu - free the tt_local_entry
 225  * @rcu: rcu pointer of the tt_local_entry
 226  */
 227 static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
 228 {
 229         struct batadv_tt_local_entry *tt_local_entry;
 230
 231         tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
 232                                       common.rcu);
 233
 234         kmem_cache_free(batadv_tl_cache, tt_local_entry);
 235 }
 236
 237 /**
 238  * batadv_tt_local_entry_release - release tt_local_entry from lists and queue
 239  *  for free after rcu grace period
 240  * @ref: kref pointer of the nc_node
 241  */
 242 static void batadv_tt_local_entry_release(struct kref *ref)
 243 {
 244         struct batadv_tt_local_entry *tt_local_entry;
 245
 246         tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
 247                                       common.refcount);
 248
 249         batadv_softif_vlan_put(tt_local_entry->vlan);
 250
 251         call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu);
 252 }
 253
 254 /**
 255  * batadv_tt_local_entry_put - decrement the tt_local_entry refcounter and
 256  *  possibly release it
 257  * @tt_local_entry: tt_local_entry to be free'd
 258  */
 259 static void
 260 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
 261 {
 262         kref_put(&tt_local_entry->common.refcount,
 263                  batadv_tt_local_entry_release);
 264 }
 265
 266 /**
 267  * batadv_tt_global_entry_free_rcu - free the tt_global_entry
 268  * @rcu: rcu pointer of the tt_global_entry
 269  */
 270 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
 271 {
 272         struct batadv_tt_global_entry *tt_global_entry;
 273
 274         tt_global_entry = container_of(rcu, struct batadv_tt_global_entry,
 275                                        common.rcu);
 276
 277         kmem_cache_free(batadv_tg_cache, tt_global_entry);
 278 }
 279
 280 /**
 281  * batadv_tt_global_entry_release - release tt_global_entry from lists and queue
 282  *  for free after rcu grace period
 283  * @ref: kref pointer of the nc_node
 284  */
 285 static void batadv_tt_global_entry_release(struct kref *ref)
 286 {
 287         struct batadv_tt_global_entry *tt_global_entry;
 288
 289         tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
 290                                        common.refcount);
 291
 292         batadv_tt_global_del_orig_list(tt_global_entry);
 293
 294         call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu);
 295 }
 296
 297 /**
 298  * batadv_tt_global_entry_put - decrement the tt_global_entry refcounter and
 299  *  possibly release it
 300  * @tt_global_entry: tt_global_entry to be free'd
 301  */
 302 static void
 303 batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
 304 {
 305         kref_put(&tt_global_entry->common.refcount,
 306                  batadv_tt_global_entry_release);
 307 }
 308
 309 /**
 310  * batadv_tt_global_hash_count - count the number of orig entries
 311  * @bat_priv: the bat priv with all the soft interface information
 312  * @addr: the mac address of the client to count entries for
 313  * @vid: VLAN identifier
 314  *
 315  * Return: the number of originators advertising the given address/data
 316  * (excluding ourself).
 317  */
 318 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
 319                                 const u8 *addr, unsigned short vid)
 320 {
 321         struct batadv_tt_global_entry *tt_global_entry;
 322         int count;
 323
 324         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 325         if (!tt_global_entry)
 326                 return 0;
 327
 328         count = atomic_read(&tt_global_entry->orig_list_count);
 329         batadv_tt_global_entry_put(tt_global_entry);
 330
 331         return count;
 332 }
 333
 334 /**
 335  * batadv_tt_local_size_mod - change the size by v of the local table identified
 336  *  by vid
 337  * @bat_priv: the bat priv with all the soft interface information
 338  * @vid: the VLAN identifier of the sub-table to change
 339  * @v: the amount to sum to the local table size
 340  */
 341 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 342                                      unsigned short vid, int v)
 343 {
 344         struct batadv_softif_vlan *vlan;
 345
 346         vlan = batadv_softif_vlan_get(bat_priv, vid);
 347         if (!vlan)
 348                 return;
 349
 350         atomic_add(v, &vlan->tt.num_entries);
 351
 352         batadv_softif_vlan_put(vlan);
 353 }
 354
 355 /**
 356  * batadv_tt_local_size_inc - increase by one the local table size for the given
 357  *  vid
 358  * @bat_priv: the bat priv with all the soft interface information
 359  * @vid: the VLAN identifier
 360  */
 361 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 362                                      unsigned short vid)
 363 {
 364         batadv_tt_local_size_mod(bat_priv, vid, 1);
 365 }
 366
 367 /**
 368  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 369  *  vid
 370  * @bat_priv: the bat priv with all the soft interface information
 371  * @vid: the VLAN identifier
 372  */
 373 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 374                                      unsigned short vid)
 375 {
 376         batadv_tt_local_size_mod(bat_priv, vid, -1);
 377 }
 378
 379 /**
 380  * batadv_tt_global_size_mod - change the size by v of the global table
 381  *  for orig_node identified by vid
 382  * @orig_node: the originator for which the table has to be modified
 383  * @vid: the VLAN identifier
 384  * @v: the amount to sum to the global table size
 385  */
 386 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 387                                       unsigned short vid, int v)
 388 {
 389         struct batadv_orig_node_vlan *vlan;
 390
 391         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 392         if (!vlan)
 393                 return;
 394
 395         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 396                 spin_lock_bh(&orig_node->vlan_list_lock);
 397                 if (!hlist_unhashed(&vlan->list)) {
 398                         hlist_del_init_rcu(&vlan->list);
 399                         batadv_orig_node_vlan_put(vlan);
 400                 }
 401                 spin_unlock_bh(&orig_node->vlan_list_lock);
 402         }
 403
 404         batadv_orig_node_vlan_put(vlan);
 405 }
 406
 407 /**
 408  * batadv_tt_global_size_inc - increase by one the global table size for the
 409  *  given vid
 410  * @orig_node: the originator which global table size has to be decreased
 411  * @vid: the vlan identifier
 412  */
 413 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 414                                       unsigned short vid)
 415 {
 416         batadv_tt_global_size_mod(orig_node, vid, 1);
 417 }
 418
 419 /**
 420  * batadv_tt_global_size_dec - decrease by one the global table size for the
 421  *  given vid
 422  * @orig_node: the originator which global table size has to be decreased
 423  * @vid: the vlan identifier
 424  */
 425 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 426                                       unsigned short vid)
 427 {
 428         batadv_tt_global_size_mod(orig_node, vid, -1);
 429 }
 430
 431 /**
 432  * batadv_tt_orig_list_entry_free_rcu - free the orig_entry
 433  * @rcu: rcu pointer of the orig_entry
 434  */
 435 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 436 {
 437         struct batadv_tt_orig_list_entry *orig_entry;
 438
 439         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 440
 441         kmem_cache_free(batadv_tt_orig_cache, orig_entry);
 442 }
 443
 444 /**
 445  * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
 446  *  queue for free after rcu grace period
 447  * @ref: kref pointer of the tt orig entry
 448  */
 449 static void batadv_tt_orig_list_entry_release(struct kref *ref)
 450 {
 451         struct batadv_tt_orig_list_entry *orig_entry;
 452
 453         orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
 454                                   refcount);
 455
 456         batadv_orig_node_put(orig_entry->orig_node);
 457         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 458 }
 459
 460 /**
 461  * batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and
 462  *  possibly release it
 463  * @orig_entry: tt orig entry to be free'd
 464  */
 465 static void
 466 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
 467 {
 468         kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
 469 }
 470
 471 /**
 472  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 473  * @bat_priv: the bat priv with all the soft interface information
 474  * @tt_local_entry: the TT entry involved in the event
 475  * @event_flags: flags to store in the event structure
 476  */
 477 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 478                                   struct batadv_tt_local_entry *tt_local_entry,
 479                                   u8 event_flags)
 480 {
 481         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 482         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 483         u8 flags = common->flags | event_flags;
 484         bool event_removed = false;
 485         bool del_op_requested, del_op_entry;
 486
 487         tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC);
 488         if (!tt_change_node)
 489                 return;
 490
 491         tt_change_node->change.flags = flags;
 492         memset(tt_change_node->change.reserved, 0,
 493                sizeof(tt_change_node->change.reserved));
 494         ether_addr_copy(tt_change_node->change.addr, common->addr);
 495         tt_change_node->change.vid = htons(common->vid);
 496
 497         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 498
 499         /* check for ADD+DEL or DEL+ADD events */
 500         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 501         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 502                                  list) {
 503                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 504                         continue;
 505
 506                 /* DEL+ADD in the same orig interval have no effect and can be
 507                  * removed to avoid silly behaviour on the receiver side. The
 508                  * other way around (ADD+DEL) can happen in case of roaming of
 509                  * a client still in the NEW state. Roaming of NEW clients is
 510                  * now possible due to automatically recognition of "temporary"
 511                  * clients
 512                  */
 513                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 514                 if (!del_op_requested && del_op_entry)
 515                         goto del;
 516                 if (del_op_requested && !del_op_entry)
 517                         goto del;
 518
 519                 /* this is a second add in the same originator interval. It
 520                  * means that flags have been changed: update them!
 521                  */
 522                 if (!del_op_requested && !del_op_entry)
 523                         entry->change.flags = flags;
 524
 525                 continue;
 526 del:
 527                 list_del(&entry->list);
 528                 kmem_cache_free(batadv_tt_change_cache, entry);
 529                 kmem_cache_free(batadv_tt_change_cache, tt_change_node);
 530                 event_removed = true;
 531                 goto unlock;
 532         }
 533
 534         /* track the change in the OGMinterval list */
 535         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 536
 537 unlock:
 538         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 539
 540         if (event_removed)
 541                 atomic_dec(&bat_priv->tt.local_changes);
 542         else
 543                 atomic_inc(&bat_priv->tt.local_changes);
 544 }
 545
 546 /**
 547  * batadv_tt_len - compute length in bytes of given number of tt changes
 548  * @changes_num: number of tt changes
 549  *
 550  * Return: computed length in bytes.
 551  */
 552 static int batadv_tt_len(int changes_num)
 553 {
 554         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 555 }
 556
 557 /**
 558  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 559  * @tt_len: available space
 560  *
 561  * Return: the number of entries.
 562  */
 563 static u16 batadv_tt_entries(u16 tt_len)
 564 {
 565         return tt_len / batadv_tt_len(1);
 566 }
 567
 568 /**
 569  * batadv_tt_local_table_transmit_size - calculates the local translation table
 570  *  size when transmitted over the air
 571  * @bat_priv: the bat priv with all the soft interface information
 572  *
 573  * Return: local translation table size in bytes.
 574  */
 575 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 576 {
 577         u16 num_vlan = 0;
 578         u16 tt_local_entries = 0;
 579         struct batadv_softif_vlan *vlan;
 580         int hdr_size;
 581
 582         rcu_read_lock();
 583         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 584                 num_vlan++;
 585                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 586         }
 587         rcu_read_unlock();
 588
 589         /* header size of tvlv encapsulated tt response payload */
 590         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 591         hdr_size += sizeof(struct batadv_tvlv_hdr);
 592         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 593         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 594
 595         return hdr_size + batadv_tt_len(tt_local_entries);
 596 }
 597
 598 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 599 {
 600         if (bat_priv->tt.local_hash)
 601                 return 0;
 602
 603         bat_priv->tt.local_hash = batadv_hash_new(1024);
 604
 605         if (!bat_priv->tt.local_hash)
 606                 return -ENOMEM;
 607
 608         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 609                                    &batadv_tt_local_hash_lock_class_key);
 610
 611         return 0;
 612 }
 613
 614 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 615                                   struct batadv_tt_global_entry *tt_global,
 616                                   const char *message)
 617 {
 618         batadv_dbg(BATADV_DBG_TT, bat_priv,
 619                    "Deleting global tt entry %pM (vid: %d): %s\n",
 620                    tt_global->common.addr,
 621                    BATADV_PRINT_VID(tt_global->common.vid), message);
 622
 623         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 624                            batadv_choose_tt, &tt_global->common);
 625         batadv_tt_global_entry_put(tt_global);
 626 }
 627
 628 /**
 629  * batadv_tt_local_add - add a new client to the local table or update an
 630  *  existing client
 631  * @soft_iface: netdev struct of the mesh interface
 632  * @addr: the mac address of the client to add
 633  * @vid: VLAN identifier
 634  * @ifindex: index of the interface where the client is connected to (useful to
 635  *  identify wireless clients)
 636  * @mark: the value contained in the skb->mark field of the received packet (if
 637  *  any)
 638  *
 639  * Return: true if the client was successfully added, false otherwise.
 640  */
 641 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
 642                          unsigned short vid, int ifindex, u32 mark)
 643 {
 644         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 645         struct batadv_tt_local_entry *tt_local;
 646         struct batadv_tt_global_entry *tt_global = NULL;
 647         struct net *net = dev_net(soft_iface);
 648         struct batadv_softif_vlan *vlan;
 649         struct net_device *in_dev = NULL;
 650         struct hlist_head *head;
 651         struct batadv_tt_orig_list_entry *orig_entry;
 652         int hash_added, table_size, packet_size_max;
 653         bool ret = false;
 654         bool roamed_back = false;
 655         u8 remote_flags;
 656         u32 match_mark;
 657
 658         if (ifindex != BATADV_NULL_IFINDEX)
 659                 in_dev = dev_get_by_index(net, ifindex);
 660
 661         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 662
 663         if (!is_multicast_ether_addr(addr))
 664                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 665
 666         if (tt_local) {
 667                 tt_local->last_seen = jiffies;
 668                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 669                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 670                                    "Re-adding pending client %pM (vid: %d)\n",
 671                                    addr, BATADV_PRINT_VID(vid));
 672                         /* whatever the reason why the PENDING flag was set,
 673                          * this is a client which was enqueued to be removed in
 674                          * this orig_interval. Since it popped up again, the
 675                          * flag can be reset like it was never enqueued
 676                          */
 677                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 678                         goto add_event;
 679                 }
 680
 681                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 682                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 683                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 684                                    addr, BATADV_PRINT_VID(vid));
 685                         /* the ROAM flag is set because this client roamed away
 686                          * and the node got a roaming_advertisement message. Now
 687                          * that the client popped up again at its original
 688                          * location such flag can be unset
 689                          */
 690                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 691                         roamed_back = true;
 692                 }
 693                 goto check_roaming;
 694         }
 695
 696         /* Ignore the client if we cannot send it in a full table response. */
 697         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 698         table_size += batadv_tt_len(1);
 699         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 700         if (table_size > packet_size_max) {
 701                 net_ratelimited_function(batadv_info, soft_iface,
 702                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 703                                          table_size, packet_size_max, addr);
 704                 goto out;
 705         }
 706
 707         tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
 708         if (!tt_local)
 709                 goto out;
 710
 711         /* increase the refcounter of the related vlan */
 712         vlan = batadv_softif_vlan_get(bat_priv, vid);
 713         if (!vlan) {
 714                 net_ratelimited_function(batadv_info, soft_iface,
 715                                          "adding TT local entry %pM to non-existent VLAN %d\n",
 716                                          addr, BATADV_PRINT_VID(vid));
 717                 kmem_cache_free(batadv_tl_cache, tt_local);
 718                 tt_local = NULL;
 719                 goto out;
 720         }
 721
 722         batadv_dbg(BATADV_DBG_TT, bat_priv,
 723                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 724                    addr, BATADV_PRINT_VID(vid),
 725                    (u8)atomic_read(&bat_priv->tt.vn));
 726
 727         ether_addr_copy(tt_local->common.addr, addr);
 728         /* The local entry has to be marked as NEW to avoid to send it in
 729          * a full table response going out before the next ttvn increment
 730          * (consistency check)
 731          */
 732         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 733         tt_local->common.vid = vid;
 734         if (batadv_is_wifi_netdev(in_dev))
 735                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 736         kref_init(&tt_local->common.refcount);
 737         tt_local->last_seen = jiffies;
 738         tt_local->common.added_at = tt_local->last_seen;
 739         tt_local->vlan = vlan;
 740
 741         /* the batman interface mac and multicast addresses should never be
 742          * purged
 743          */
 744         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
 745             is_multicast_ether_addr(addr))
 746                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 747
 748         kref_get(&tt_local->common.refcount);
 749         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 750                                      batadv_choose_tt, &tt_local->common,
 751                                      &tt_local->common.hash_entry);
 752
 753         if (unlikely(hash_added != 0)) {
 754                 /* remove the reference for the hash */
 755                 batadv_tt_local_entry_put(tt_local);
 756                 goto out;
 757         }
 758
 759 add_event:
 760         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 761
 762 check_roaming:
 763         /* Check whether it is a roaming, but don't do anything if the roaming
 764          * process has already been handled
 765          */
 766         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 767                 /* These node are probably going to update their tt table */
 768                 head = &tt_global->orig_list;
 769                 rcu_read_lock();
 770                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 771                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 772                                              tt_global->common.vid,
 773                                              orig_entry->orig_node);
 774                 }
 775                 rcu_read_unlock();
 776                 if (roamed_back) {
 777                         batadv_tt_global_free(bat_priv, tt_global,
 778                                               "Roaming canceled");
 779                         tt_global = NULL;
 780                 } else {
 781                         /* The global entry has to be marked as ROAMING and
 782                          * has to be kept for consistency purpose
 783                          */
 784                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 785                         tt_global->roam_at = jiffies;
 786                 }
 787         }
 788
 789         /* store the current remote flags before altering them. This helps
 790          * understanding is flags are changing or not
 791          */
 792         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 793
 794         if (batadv_is_wifi_netdev(in_dev))
 795                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 796         else
 797                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 798
 799         /* check the mark in the skb: if it's equal to the configured
 800          * isolation_mark, it means the packet is coming from an isolated
 801          * non-mesh client
 802          */
 803         match_mark = (mark & bat_priv->isolation_mark_mask);
 804         if (bat_priv->isolation_mark_mask &&
 805             match_mark == bat_priv->isolation_mark)
 806                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 807         else
 808                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 809
 810         /* if any "dynamic" flag has been modified, resend an ADD event for this
 811          * entry so that all the nodes can get the new flags
 812          */
 813         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 814                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 815
 816         ret = true;
 817 out:
 818         if (in_dev)
 819                 dev_put(in_dev);
 820         if (tt_local)
 821                 batadv_tt_local_entry_put(tt_local);
 822         if (tt_global)
 823                 batadv_tt_global_entry_put(tt_global);
 824         return ret;
 825 }
 826
 827 /**
 828  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 829  *  within a TT Response directed to another node
 830  * @orig_node: originator for which the TT data has to be prepared
 831  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 832  * @tt_change: uninitialised pointer to the address of the area where the TT
 833  *  changed can be stored
 834  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 835  *  function reserves the amount of space needed to send the entire global TT
 836  *  table. In case of success the value is updated with the real amount of
 837  *  reserved bytes
 838  * Allocate the needed amount of memory for the entire TT TVLV and write its
 839  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 840  * objects, one per active VLAN served by the originator node.
 841  *
 842  * Return: the size of the allocated buffer or 0 in case of failure.
 843  */
 844 static u16
 845 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 846                                    struct batadv_tvlv_tt_data **tt_data,
 847                                    struct batadv_tvlv_tt_change **tt_change,
 848                                    s32 *tt_len)
 849 {
 850         u16 num_vlan = 0;
 851         u16 num_entries = 0;
 852         u16 change_offset;
 853         u16 tvlv_len;
 854         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 855         struct batadv_orig_node_vlan *vlan;
 856         u8 *tt_change_ptr;
 857
 858         rcu_read_lock();
 859         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 860                 num_vlan++;
 861                 num_entries += atomic_read(&vlan->tt.num_entries);
 862         }
 863
 864         change_offset = sizeof(**tt_data);
 865         change_offset += num_vlan * sizeof(*tt_vlan);
 866
 867         /* if tt_len is negative, allocate the space needed by the full table */
 868         if (*tt_len < 0)
 869                 *tt_len = batadv_tt_len(num_entries);
 870
 871         tvlv_len = *tt_len;
 872         tvlv_len += change_offset;
 873
 874         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 875         if (!*tt_data) {
 876                 *tt_len = 0;
 877                 goto out;
 878         }
 879
 880         (*tt_data)->flags = BATADV_NO_FLAGS;
 881         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 882         (*tt_data)->num_vlan = htons(num_vlan);
 883
 884         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 885         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 886                 tt_vlan->vid = htons(vlan->vid);
 887                 tt_vlan->crc = htonl(vlan->tt.crc);
 888
 889                 tt_vlan++;
 890         }
 891
 892         tt_change_ptr = (u8 *)*tt_data + change_offset;
 893         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 894
 895 out:
 896         rcu_read_unlock();
 897         return tvlv_len;
 898 }
 899
 900 /**
 901  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 902  *  node
 903  * @bat_priv: the bat priv with all the soft interface information
 904  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 905  * @tt_change: uninitialised pointer to the address of the area where the TT
 906  *  changes can be stored
 907  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 908  *  function reserves the amount of space needed to send the entire local TT
 909  *  table. In case of success the value is updated with the real amount of
 910  *  reserved bytes
 911  *
 912  * Allocate the needed amount of memory for the entire TT TVLV and write its
 913  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 914  * objects, one per active VLAN.
 915  *
 916  * Return: the size of the allocated buffer or 0 in case of failure.
 917  */
 918 static u16
 919 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 920                                   struct batadv_tvlv_tt_data **tt_data,
 921                                   struct batadv_tvlv_tt_change **tt_change,
 922                                   s32 *tt_len)
 923 {
 924         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 925         struct batadv_softif_vlan *vlan;
 926         u16 num_vlan = 0;
 927         u16 num_entries = 0;
 928         u16 tvlv_len;
 929         u8 *tt_change_ptr;
 930         int change_offset;
 931
 932         rcu_read_lock();
 933         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 934                 num_vlan++;
 935                 num_entries += atomic_read(&vlan->tt.num_entries);
 936         }
 937
 938         change_offset = sizeof(**tt_data);
 939         change_offset += num_vlan * sizeof(*tt_vlan);
 940
 941         /* if tt_len is negative, allocate the space needed by the full table */
 942         if (*tt_len < 0)
 943                 *tt_len = batadv_tt_len(num_entries);
 944
 945         tvlv_len = *tt_len;
 946         tvlv_len += change_offset;
 947
 948         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 949         if (!*tt_data) {
 950                 tvlv_len = 0;
 951                 goto out;
 952         }
 953
 954         (*tt_data)->flags = BATADV_NO_FLAGS;
 955         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 956         (*tt_data)->num_vlan = htons(num_vlan);
 957
 958         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 959         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 960                 tt_vlan->vid = htons(vlan->vid);
 961                 tt_vlan->crc = htonl(vlan->tt.crc);
 962
 963                 tt_vlan++;
 964         }
 965
 966         tt_change_ptr = (u8 *)*tt_data + change_offset;
 967         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 968
 969 out:
 970         rcu_read_unlock();
 971         return tvlv_len;
 972 }
 973
 974 /**
 975  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 976  *  after local tt changes have been committed
 977  * @bat_priv: the bat priv with all the soft interface information
 978  */
 979 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 980 {
 981         struct batadv_tt_change_node *entry, *safe;
 982         struct batadv_tvlv_tt_data *tt_data;
 983         struct batadv_tvlv_tt_change *tt_change;
 984         int tt_diff_len, tt_change_len = 0;
 985         int tt_diff_entries_num = 0;
 986         int tt_diff_entries_count = 0;
 987         u16 tvlv_len;
 988
 989         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 990         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 991
 992         /* if we have too many changes for one packet don't send any
 993          * and wait for the tt table request which will be fragmented
 994          */
 995         if (tt_diff_len > bat_priv->soft_iface->mtu)
 996                 tt_diff_len = 0;
 997
 998         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 999                                                      &tt_change, &tt_diff_len);
1000         if (!tvlv_len)
1001                 return;
1002
1003         tt_data->flags = BATADV_TT_OGM_DIFF;
1004
1005         if (tt_diff_len == 0)
1006                 goto container_register;
1007
1008         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1009         atomic_set(&bat_priv->tt.local_changes, 0);
1010
1011         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1012                                  list) {
1013                 if (tt_diff_entries_count < tt_diff_entries_num) {
1014                         memcpy(tt_change + tt_diff_entries_count,
1015                                &entry->change,
1016                                sizeof(struct batadv_tvlv_tt_change));
1017                         tt_diff_entries_count++;
1018                 }
1019                 list_del(&entry->list);
1020                 kmem_cache_free(batadv_tt_change_cache, entry);
1021         }
1022         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1023
1024         /* Keep the buffer for possible tt_request */
1025         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1026         kfree(bat_priv->tt.last_changeset);
1027         bat_priv->tt.last_changeset_len = 0;
1028         bat_priv->tt.last_changeset = NULL;
1029         tt_change_len = batadv_tt_len(tt_diff_entries_count);
1030         /* check whether this new OGM has no changes due to size problems */
1031         if (tt_diff_entries_count > 0) {
1032                 /* if kmalloc() fails we will reply with the full table
1033                  * instead of providing the diff
1034                  */
1035                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
1036                 if (bat_priv->tt.last_changeset) {
1037                         memcpy(bat_priv->tt.last_changeset,
1038                                tt_change, tt_change_len);
1039                         bat_priv->tt.last_changeset_len = tt_diff_len;
1040                 }
1041         }
1042         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1043
1044 container_register:
1045         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
1046                                        tvlv_len);
1047         kfree(tt_data);
1048 }
1049
1050 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1051 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
1052 {
1053         struct net_device *net_dev = (struct net_device *)seq->private;
1054         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1055         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1056         struct batadv_tt_common_entry *tt_common_entry;
1057         struct batadv_tt_local_entry *tt_local;
1058         struct batadv_hard_iface *primary_if;
1059         struct hlist_head *head;
1060         u32 i;
1061         int last_seen_secs;
1062         int last_seen_msecs;
1063         unsigned long last_seen_jiffies;
1064         bool no_purge;
1065         u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
1066
1067         primary_if = batadv_seq_print_text_primary_if_get(seq);
1068         if (!primary_if)
1069                 goto out;
1070
1071         seq_printf(seq,
1072                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
1073                    net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
1074         seq_puts(seq,
1075                  "       Client         VID Flags    Last seen (CRC       )\n");
1076
1077         for (i = 0; i < hash->size; i++) {
1078                 head = &hash->table[i];
1079
1080                 rcu_read_lock();
1081                 hlist_for_each_entry_rcu(tt_common_entry,
1082                                          head, hash_entry) {
1083                         tt_local = container_of(tt_common_entry,
1084                                                 struct batadv_tt_local_entry,
1085                                                 common);
1086                         last_seen_jiffies = jiffies - tt_local->last_seen;
1087                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1088                         last_seen_secs = last_seen_msecs / 1000;
1089                         last_seen_msecs = last_seen_msecs % 1000;
1090
1091                         no_purge = tt_common_entry->flags & np_flag;
1092                         seq_printf(seq,
1093                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
1094                                    tt_common_entry->addr,
1095                                    BATADV_PRINT_VID(tt_common_entry->vid),
1096                                    ((tt_common_entry->flags &
1097                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1098                                    no_purge ? 'P' : '.',
1099                                    ((tt_common_entry->flags &
1100                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1101                                    ((tt_common_entry->flags &
1102                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1103                                    ((tt_common_entry->flags &
1104                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1105                                    ((tt_common_entry->flags &
1106                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1107                                    no_purge ? 0 : last_seen_secs,
1108                                    no_purge ? 0 : last_seen_msecs,
1109                                    tt_local->vlan->tt.crc);
1110                 }
1111                 rcu_read_unlock();
1112         }
1113 out:
1114         if (primary_if)
1115                 batadv_hardif_put(primary_if);
1116         return 0;
1117 }
1118 #endif
1119
1120 /**
1121  * batadv_tt_local_dump_entry - Dump one TT local entry into a message
1122  * @msg :Netlink message to dump into
1123  * @portid: Port making netlink request
1124  * @seq: Sequence number of netlink message
1125  * @bat_priv: The bat priv with all the soft interface information
1126  * @common: tt local & tt global common data
1127  *
1128  * Return: Error code, or 0 on success
1129  */
1130 static int
1131 batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
1132                            struct batadv_priv *bat_priv,
1133                            struct batadv_tt_common_entry *common)
1134 {
1135         void *hdr;
1136         struct batadv_softif_vlan *vlan;
1137         struct batadv_tt_local_entry *local;
1138         unsigned int last_seen_msecs;
1139         u32 crc;
1140
1141         local = container_of(common, struct batadv_tt_local_entry, common);
1142         last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);
1143
1144         vlan = batadv_softif_vlan_get(bat_priv, common->vid);
1145         if (!vlan)
1146                 return 0;
1147
1148         crc = vlan->tt.crc;
1149
1150         batadv_softif_vlan_put(vlan);
1151
1152         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
1153                           NLM_F_MULTI,
1154                           BATADV_CMD_GET_TRANSTABLE_LOCAL);
1155         if (!hdr)
1156                 return -ENOBUFS;
1157
1158         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
1159             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
1160             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
1161             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
1162                 goto nla_put_failure;
1163
1164         if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
1165             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
1166                 goto nla_put_failure;
1167
1168         genlmsg_end(msg, hdr);
1169         return 0;
1170
1171  nla_put_failure:
1172         genlmsg_cancel(msg, hdr);
1173         return -EMSGSIZE;
1174 }
1175
1176 /**
1177  * batadv_tt_local_dump_bucket - Dump one TT local bucket into a message
1178  * @msg: Netlink message to dump into
1179  * @portid: Port making netlink request
1180  * @seq: Sequence number of netlink message
1181  * @bat_priv: The bat priv with all the soft interface information
1182  * @head: Pointer to the list containing the local tt entries
1183  * @idx_s: Number of entries to skip
1184  *
1185  * Return: Error code, or 0 on success
1186  */
1187 static int
1188 batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
1189                             struct batadv_priv *bat_priv,
1190                             struct hlist_head *head, int *idx_s)
1191 {
1192         struct batadv_tt_common_entry *common;
1193         int idx = 0;
1194
1195         rcu_read_lock();
1196         hlist_for_each_entry_rcu(common, head, hash_entry) {
1197                 if (idx++ < *idx_s)
1198                         continue;
1199
1200                 if (batadv_tt_local_dump_entry(msg, portid, seq, bat_priv,
1201                                                common)) {
1202                         rcu_read_unlock();
1203                         *idx_s = idx - 1;
1204                         return -EMSGSIZE;
1205                 }
1206         }
1207         rcu_read_unlock();
1208
1209         *idx_s = 0;
1210         return 0;
1211 }
1212
1213 /**
1214  * batadv_tt_local_dump - Dump TT local entries into a message
1215  * @msg: Netlink message to dump into
1216  * @cb: Parameters from query
1217  *
1218  * Return: Error code, or 0 on success
1219  */
1220 int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
1221 {
1222         struct net *net = sock_net(cb->skb->sk);
1223         struct net_device *soft_iface;
1224         struct batadv_priv *bat_priv;
1225         struct batadv_hard_iface *primary_if = NULL;
1226         struct batadv_hashtable *hash;
1227         struct hlist_head *head;
1228         int ret;
1229         int ifindex;
1230         int bucket = cb->args[0];
1231         int idx = cb->args[1];
1232         int portid = NETLINK_CB(cb->skb).portid;
1233
1234         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
1235         if (!ifindex)
1236                 return -EINVAL;
1237
1238         soft_iface = dev_get_by_index(net, ifindex);
1239         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
1240                 ret = -ENODEV;
1241                 goto out;
1242         }
1243
1244         bat_priv = netdev_priv(soft_iface);
1245
1246         primary_if = batadv_primary_if_get_selected(bat_priv);
1247         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
1248                 ret = -ENOENT;
1249                 goto out;
1250         }
1251
1252         hash = bat_priv->tt.local_hash;
1253
1254         while (bucket < hash->size) {
1255                 head = &hash->table[bucket];
1256
1257                 if (batadv_tt_local_dump_bucket(msg, portid, cb->nlh->nlmsg_seq,
1258                                                 bat_priv, head, &idx))
1259                         break;
1260
1261                 bucket++;
1262         }
1263
1264         ret = msg->len;
1265
1266  out:
1267         if (primary_if)
1268                 batadv_hardif_put(primary_if);
1269         if (soft_iface)
1270                 dev_put(soft_iface);
1271
1272         cb->args[0] = bucket;
1273         cb->args[1] = idx;
1274
1275         return ret;
1276 }
1277
1278 static void
1279 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1280                             struct batadv_tt_local_entry *tt_local_entry,
1281                             u16 flags, const char *message)
1282 {
1283         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1284
1285         /* The local client has to be marked as "pending to be removed" but has
1286          * to be kept in the table in order to send it in a full table
1287          * response issued before the net ttvn increment (consistency check)
1288          */
1289         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1290
1291         batadv_dbg(BATADV_DBG_TT, bat_priv,
1292                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1293                    tt_local_entry->common.addr,
1294                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1295 }
1296
1297 /**
1298  * batadv_tt_local_remove - logically remove an entry from the local table
1299  * @bat_priv: the bat priv with all the soft interface information
1300  * @addr: the MAC address of the client to remove
1301  * @vid: VLAN identifier
1302  * @message: message to append to the log on deletion
1303  * @roaming: true if the deletion is due to a roaming event
1304  *
1305  * Return: the flags assigned to the local entry before being deleted
1306  */
1307 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1308                            unsigned short vid, const char *message,
1309                            bool roaming)
1310 {
1311         struct batadv_tt_local_entry *tt_local_entry;
1312         u16 flags, curr_flags = BATADV_NO_FLAGS;
1313         void *tt_entry_exists;
1314
1315         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1316         if (!tt_local_entry)
1317                 goto out;
1318
1319         curr_flags = tt_local_entry->common.flags;
1320
1321         flags = BATADV_TT_CLIENT_DEL;
1322         /* if this global entry addition is due to a roaming, the node has to
1323          * mark the local entry as "roamed" in order to correctly reroute
1324          * packets later
1325          */
1326         if (roaming) {
1327                 flags |= BATADV_TT_CLIENT_ROAM;
1328                 /* mark the local client as ROAMed */
1329                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1330         }
1331
1332         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1333                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1334                                             message);
1335                 goto out;
1336         }
1337         /* if this client has been added right now, it is possible to
1338          * immediately purge it
1339          */
1340         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1341
1342         tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1343                                              batadv_compare_tt,
1344                                              batadv_choose_tt,
1345                                              &tt_local_entry->common);
1346         if (!tt_entry_exists)
1347                 goto out;
1348
1349         /* extra call to free the local tt entry */
1350         batadv_tt_local_entry_put(tt_local_entry);
1351
1352 out:
1353         if (tt_local_entry)
1354                 batadv_tt_local_entry_put(tt_local_entry);
1355
1356         return curr_flags;
1357 }
1358
1359 /**
1360  * batadv_tt_local_purge_list - purge inactive tt local entries
1361  * @bat_priv: the bat priv with all the soft interface information
1362  * @head: pointer to the list containing the local tt entries
1363  * @timeout: parameter deciding whether a given tt local entry is considered
1364  *  inactive or not
1365  */
1366 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1367                                        struct hlist_head *head,
1368                                        int timeout)
1369 {
1370         struct batadv_tt_local_entry *tt_local_entry;
1371         struct batadv_tt_common_entry *tt_common_entry;
1372         struct hlist_node *node_tmp;
1373
1374         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1375                                   hash_entry) {
1376                 tt_local_entry = container_of(tt_common_entry,
1377                                               struct batadv_tt_local_entry,
1378                                               common);
1379                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1380                         continue;
1381
1382                 /* entry already marked for deletion */
1383                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1384                         continue;
1385
1386                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1387                         continue;
1388
1389                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1390                                             BATADV_TT_CLIENT_DEL, "timed out");
1391         }
1392 }
1393
1394 /**
1395  * batadv_tt_local_purge - purge inactive tt local entries
1396  * @bat_priv: the bat priv with all the soft interface information
1397  * @timeout: parameter deciding whether a given tt local entry is considered
1398  *  inactive or not
1399  */
1400 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1401                                   int timeout)
1402 {
1403         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1404         struct hlist_head *head;
1405         spinlock_t *list_lock; /* protects write access to the hash lists */
1406         u32 i;
1407
1408         for (i = 0; i < hash->size; i++) {
1409                 head = &hash->table[i];
1410                 list_lock = &hash->list_locks[i];
1411
1412                 spin_lock_bh(list_lock);
1413                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1414                 spin_unlock_bh(list_lock);
1415         }
1416 }
1417
1418 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1419 {
1420         struct batadv_hashtable *hash;
1421         spinlock_t *list_lock; /* protects write access to the hash lists */
1422         struct batadv_tt_common_entry *tt_common_entry;
1423         struct batadv_tt_local_entry *tt_local;
1424         struct hlist_node *node_tmp;
1425         struct hlist_head *head;
1426         u32 i;
1427
1428         if (!bat_priv->tt.local_hash)
1429                 return;
1430
1431         hash = bat_priv->tt.local_hash;
1432
1433         for (i = 0; i < hash->size; i++) {
1434                 head = &hash->table[i];
1435                 list_lock = &hash->list_locks[i];
1436
1437                 spin_lock_bh(list_lock);
1438                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1439                                           head, hash_entry) {
1440                         hlist_del_rcu(&tt_common_entry->hash_entry);
1441                         tt_local = container_of(tt_common_entry,
1442                                                 struct batadv_tt_local_entry,
1443                                                 common);
1444
1445                         batadv_tt_local_entry_put(tt_local);
1446                 }
1447                 spin_unlock_bh(list_lock);
1448         }
1449
1450         batadv_hash_destroy(hash);
1451
1452         bat_priv->tt.local_hash = NULL;
1453 }
1454
1455 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1456 {
1457         if (bat_priv->tt.global_hash)
1458                 return 0;
1459
1460         bat_priv->tt.global_hash = batadv_hash_new(1024);
1461
1462         if (!bat_priv->tt.global_hash)
1463                 return -ENOMEM;
1464
1465         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1466                                    &batadv_tt_global_hash_lock_class_key);
1467
1468         return 0;
1469 }
1470
1471 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1472 {
1473         struct batadv_tt_change_node *entry, *safe;
1474
1475         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1476
1477         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1478                                  list) {
1479                 list_del(&entry->list);
1480                 kmem_cache_free(batadv_tt_change_cache, entry);
1481         }
1482
1483         atomic_set(&bat_priv->tt.local_changes, 0);
1484         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1485 }
1486
1487 /**
1488  * batadv_tt_global_orig_entry_find - find a TT orig_list_entry
1489  * @entry: the TT global entry where the orig_list_entry has to be
1490  *  extracted from
1491  * @orig_node: the originator for which the orig_list_entry has to be found
1492  *
1493  * retrieve the orig_tt_list_entry belonging to orig_node from the
1494  * batadv_tt_global_entry list
1495  *
1496  * Return: it with an increased refcounter, NULL if not found
1497  */
1498 static struct batadv_tt_orig_list_entry *
1499 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1500                                  const struct batadv_orig_node *orig_node)
1501 {
1502         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1503         const struct hlist_head *head;
1504
1505         rcu_read_lock();
1506         head = &entry->orig_list;
1507         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1508                 if (tmp_orig_entry->orig_node != orig_node)
1509                         continue;
1510                 if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
1511                         continue;
1512
1513                 orig_entry = tmp_orig_entry;
1514                 break;
1515         }
1516         rcu_read_unlock();
1517
1518         return orig_entry;
1519 }
1520
1521 /**
1522  * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
1523  *  by a given originator
1524  * @entry: the TT global entry to check
1525  * @orig_node: the originator to search in the list
1526  *
1527  * find out if an orig_node is already in the list of a tt_global_entry.
1528  *
1529  * Return: true if found, false otherwise
1530  */
1531 static bool
1532 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1533                                 const struct batadv_orig_node *orig_node)
1534 {
1535         struct batadv_tt_orig_list_entry *orig_entry;
1536         bool found = false;
1537
1538         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1539         if (orig_entry) {
1540                 found = true;
1541                 batadv_tt_orig_list_entry_put(orig_entry);
1542         }
1543
1544         return found;
1545 }
1546
1547 static void
1548 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1549                                 struct batadv_orig_node *orig_node, int ttvn)
1550 {
1551         struct batadv_tt_orig_list_entry *orig_entry;
1552
1553         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1554         if (orig_entry) {
1555                 /* refresh the ttvn: the current value could be a bogus one that
1556                  * was added during a "temporary client detection"
1557                  */
1558                 orig_entry->ttvn = ttvn;
1559                 goto out;
1560         }
1561
1562         orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
1563         if (!orig_entry)
1564                 goto out;
1565
1566         INIT_HLIST_NODE(&orig_entry->list);
1567         kref_get(&orig_node->refcount);
1568         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1569         orig_entry->orig_node = orig_node;
1570         orig_entry->ttvn = ttvn;
1571         kref_init(&orig_entry->refcount);
1572
1573         spin_lock_bh(&tt_global->list_lock);
1574         kref_get(&orig_entry->refcount);
1575         hlist_add_head_rcu(&orig_entry->list,
1576                            &tt_global->orig_list);
1577         spin_unlock_bh(&tt_global->list_lock);
1578         atomic_inc(&tt_global->orig_list_count);
1579
1580 out:
1581         if (orig_entry)
1582                 batadv_tt_orig_list_entry_put(orig_entry);
1583 }
1584
1585 /**
1586  * batadv_tt_global_add - add a new TT global entry or update an existing one
1587  * @bat_priv: the bat priv with all the soft interface information
1588  * @orig_node: the originator announcing the client
1589  * @tt_addr: the mac address of the non-mesh client
1590  * @vid: VLAN identifier
1591  * @flags: TT flags that have to be set for this non-mesh client
1592  * @ttvn: the tt version number ever announcing this non-mesh client
1593  *
1594  * Add a new TT global entry for the given originator. If the entry already
1595  * exists add a new reference to the given originator (a global entry can have
1596  * references to multiple originators) and adjust the flags attribute to reflect
1597  * the function argument.
1598  * If a TT local entry exists for this non-mesh client remove it.
1599  *
1600  * The caller must hold orig_node refcount.
1601  *
1602  * Return: true if the new entry has been added, false otherwise
1603  */
1604 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1605                                  struct batadv_orig_node *orig_node,
1606                                  const unsigned char *tt_addr,
1607                                  unsigned short vid, u16 flags, u8 ttvn)
1608 {
1609         struct batadv_tt_global_entry *tt_global_entry;
1610         struct batadv_tt_local_entry *tt_local_entry;
1611         bool ret = false;
1612         int hash_added;
1613         struct batadv_tt_common_entry *common;
1614         u16 local_flags;
1615
1616         /* ignore global entries from backbone nodes */
1617         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1618                 return true;
1619
1620         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1621         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1622
1623         /* if the node already has a local client for this entry, it has to wait
1624          * for a roaming advertisement instead of manually messing up the global
1625          * table
1626          */
1627         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1628             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1629                 goto out;
1630
1631         if (!tt_global_entry) {
1632                 tt_global_entry = kmem_cache_zalloc(batadv_tg_cache,
1633                                                     GFP_ATOMIC);
1634                 if (!tt_global_entry)
1635                         goto out;
1636
1637                 common = &tt_global_entry->common;
1638                 ether_addr_copy(common->addr, tt_addr);
1639                 common->vid = vid;
1640
1641                 common->flags = flags;
1642                 tt_global_entry->roam_at = 0;
1643                 /* node must store current time in case of roaming. This is
1644                  * needed to purge this entry out on timeout (if nobody claims
1645                  * it)
1646                  */
1647                 if (flags & BATADV_TT_CLIENT_ROAM)
1648                         tt_global_entry->roam_at = jiffies;
1649                 kref_init(&common->refcount);
1650                 common->added_at = jiffies;
1651
1652                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1653                 atomic_set(&tt_global_entry->orig_list_count, 0);
1654                 spin_lock_init(&tt_global_entry->list_lock);
1655
1656                 kref_get(&common->refcount);
1657                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1658                                              batadv_compare_tt,
1659                                              batadv_choose_tt, common,
1660                                              &common->hash_entry);
1661
1662                 if (unlikely(hash_added != 0)) {
1663                         /* remove the reference for the hash */
1664                         batadv_tt_global_entry_put(tt_global_entry);
1665                         goto out_remove;
1666                 }
1667         } else {
1668                 common = &tt_global_entry->common;
1669                 /* If there is already a global entry, we can use this one for
1670                  * our processing.
1671                  * But if we are trying to add a temporary client then here are
1672                  * two options at this point:
1673                  * 1) the global client is not a temporary client: the global
1674                  *    client has to be left as it is, temporary information
1675                  *    should never override any already known client state
1676                  * 2) the global client is a temporary client: purge the
1677                  *    originator list and add the new one orig_entry
1678                  */
1679                 if (flags & BATADV_TT_CLIENT_TEMP) {
1680                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1681                                 goto out;
1682                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1683                                                             orig_node))
1684                                 goto out_remove;
1685                         batadv_tt_global_del_orig_list(tt_global_entry);
1686                         goto add_orig_entry;
1687                 }
1688
1689                 /* if the client was temporary added before receiving the first
1690                  * OGM announcing it, we have to clear the TEMP flag. Also,
1691                  * remove the previous temporary orig node and re-add it
1692                  * if required. If the orig entry changed, the new one which
1693                  * is a non-temporary entry is preferred.
1694                  */
1695                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1696                         batadv_tt_global_del_orig_list(tt_global_entry);
1697                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1698                 }
1699
1700                 /* the change can carry possible "attribute" flags like the
1701                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1702                  * client entry
1703                  */
1704                 common->flags |= flags;
1705
1706                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1707                  * one originator left in the list and we previously received a
1708                  * delete + roaming change for this originator.
1709                  *
1710                  * We should first delete the old originator before adding the
1711                  * new one.
1712                  */
1713                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1714                         batadv_tt_global_del_orig_list(tt_global_entry);
1715                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1716                         tt_global_entry->roam_at = 0;
1717                 }
1718         }
1719 add_orig_entry:
1720         /* add the new orig_entry (if needed) or update it */
1721         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1722
1723         batadv_dbg(BATADV_DBG_TT, bat_priv,
1724                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1725                    common->addr, BATADV_PRINT_VID(common->vid),
1726                    orig_node->orig);
1727         ret = true;
1728
1729 out_remove:
1730         /* Do not remove multicast addresses from the local hash on
1731          * global additions
1732          */
1733         if (is_multicast_ether_addr(tt_addr))
1734                 goto out;
1735
1736         /* remove address from local hash if present */
1737         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1738                                              "global tt received",
1739                                              flags & BATADV_TT_CLIENT_ROAM);
1740         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1741
1742         if (!(flags & BATADV_TT_CLIENT_ROAM))
1743                 /* this is a normal global add. Therefore the client is not in a
1744                  * roaming state anymore.
1745                  */
1746                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1747
1748 out:
1749         if (tt_global_entry)
1750                 batadv_tt_global_entry_put(tt_global_entry);
1751         if (tt_local_entry)
1752                 batadv_tt_local_entry_put(tt_local_entry);
1753         return ret;
1754 }
1755
1756 /**
1757  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1758  * @bat_priv: the bat priv with all the soft interface information
1759  * @tt_global_entry: global translation table entry to be analyzed
1760  *
1761  * This functon assumes the caller holds rcu_read_lock().
1762  * Return: best originator list entry or NULL on errors.
1763  */
1764 static struct batadv_tt_orig_list_entry *
1765 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1766                             struct batadv_tt_global_entry *tt_global_entry)
1767 {
1768         struct batadv_neigh_node *router, *best_router = NULL;
1769         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1770         struct hlist_head *head;
1771         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1772
1773         head = &tt_global_entry->orig_list;
1774         hlist_for_each_entry_rcu(orig_entry, head, list) {
1775                 router = batadv_orig_router_get(orig_entry->orig_node,
1776                                                 BATADV_IF_DEFAULT);
1777                 if (!router)
1778                         continue;
1779
1780                 if (best_router &&
1781                     bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
1782                                    BATADV_IF_DEFAULT) <= 0) {
1783                         batadv_neigh_node_put(router);
1784                         continue;
1785                 }
1786
1787                 /* release the refcount for the "old" best */
1788                 if (best_router)
1789                         batadv_neigh_node_put(best_router);
1790
1791                 best_entry = orig_entry;
1792                 best_router = router;
1793         }
1794
1795         if (best_router)
1796                 batadv_neigh_node_put(best_router);
1797
1798         return best_entry;
1799 }
1800
1801 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1802 /**
1803  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1804  *  for this global entry
1805  * @bat_priv: the bat priv with all the soft interface information
1806  * @tt_global_entry: global translation table entry to be printed
1807  * @seq: debugfs table seq_file struct
1808  *
1809  * This functon assumes the caller holds rcu_read_lock().
1810  */
1811 static void
1812 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1813                              struct batadv_tt_global_entry *tt_global_entry,
1814                              struct seq_file *seq)
1815 {
1816         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1817         struct batadv_tt_common_entry *tt_common_entry;
1818         struct batadv_orig_node_vlan *vlan;
1819         struct hlist_head *head;
1820         u8 last_ttvn;
1821         u16 flags;
1822
1823         tt_common_entry = &tt_global_entry->common;
1824         flags = tt_common_entry->flags;
1825
1826         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1827         if (best_entry) {
1828                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1829                                                  tt_common_entry->vid);
1830                 if (!vlan) {
1831                         seq_printf(seq,
1832                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1833                                    BATADV_PRINT_VID(tt_common_entry->vid),
1834                                    best_entry->orig_node->orig);
1835                         goto print_list;
1836                 }
1837
1838                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1839                 seq_printf(seq,
1840                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1841                            '*', tt_global_entry->common.addr,
1842                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1843                            best_entry->ttvn, best_entry->orig_node->orig,
1844                            last_ttvn, vlan->tt.crc,
1845                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1846                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1847                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1848                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1849
1850                 batadv_orig_node_vlan_put(vlan);
1851         }
1852
1853 print_list:
1854         head = &tt_global_entry->orig_list;
1855
1856         hlist_for_each_entry_rcu(orig_entry, head, list) {
1857                 if (best_entry == orig_entry)
1858                         continue;
1859
1860                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1861                                                  tt_common_entry->vid);
1862                 if (!vlan) {
1863                         seq_printf(seq,
1864                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1865                                    BATADV_PRINT_VID(tt_common_entry->vid),
1866                                    orig_entry->orig_node->orig);
1867                         continue;
1868                 }
1869
1870                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1871                 seq_printf(seq,
1872                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1873                            '+', tt_global_entry->common.addr,
1874                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1875                            orig_entry->ttvn, orig_entry->orig_node->orig,
1876                            last_ttvn, vlan->tt.crc,
1877                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1878                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1879                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1880                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1881
1882                 batadv_orig_node_vlan_put(vlan);
1883         }
1884 }
1885
1886 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1887 {
1888         struct net_device *net_dev = (struct net_device *)seq->private;
1889         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1890         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1891         struct batadv_tt_common_entry *tt_common_entry;
1892         struct batadv_tt_global_entry *tt_global;
1893         struct batadv_hard_iface *primary_if;
1894         struct hlist_head *head;
1895         u32 i;
1896
1897         primary_if = batadv_seq_print_text_primary_if_get(seq);
1898         if (!primary_if)
1899                 goto out;
1900
1901         seq_printf(seq,
1902                    "Globally announced TT entries received via the mesh %s\n",
1903                    net_dev->name);
1904         seq_puts(seq,
1905                  "       Client         VID  (TTVN)       Originator      (Curr TTVN) (CRC       ) Flags\n");
1906
1907         for (i = 0; i < hash->size; i++) {
1908                 head = &hash->table[i];
1909
1910                 rcu_read_lock();
1911                 hlist_for_each_entry_rcu(tt_common_entry,
1912                                          head, hash_entry) {
1913                         tt_global = container_of(tt_common_entry,
1914                                                  struct batadv_tt_global_entry,
1915                                                  common);
1916                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1917                 }
1918                 rcu_read_unlock();
1919         }
1920 out:
1921         if (primary_if)
1922                 batadv_hardif_put(primary_if);
1923         return 0;
1924 }
1925 #endif
1926
1927 /**
1928  * batadv_tt_global_dump_subentry - Dump all TT local entries into a message
1929  * @msg: Netlink message to dump into
1930  * @portid: Port making netlink request
1931  * @seq: Sequence number of netlink message
1932  * @common: tt local & tt global common data
1933  * @orig: Originator node announcing a non-mesh client
1934  * @best: Is the best originator for the TT entry
1935  *
1936  * Return: Error code, or 0 on success
1937  */
1938 static int
1939 batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
1940                                struct batadv_tt_common_entry *common,
1941                                struct batadv_tt_orig_list_entry *orig,
1942                                bool best)
1943 {
1944         void *hdr;
1945         struct batadv_orig_node_vlan *vlan;
1946         u8 last_ttvn;
1947         u32 crc;
1948
1949         vlan = batadv_orig_node_vlan_get(orig->orig_node,
1950                                          common->vid);
1951         if (!vlan)
1952                 return 0;
1953
1954         crc = vlan->tt.crc;
1955
1956         batadv_orig_node_vlan_put(vlan);
1957
1958         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
1959                           NLM_F_MULTI,
1960                           BATADV_CMD_GET_TRANSTABLE_GLOBAL);
1961         if (!hdr)
1962                 return -ENOBUFS;
1963
1964         last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
1965
1966         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
1967             nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
1968                     orig->orig_node->orig) ||
1969             nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
1970             nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
1971             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
1972             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
1973             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
1974                 goto nla_put_failure;
1975
1976         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
1977                 goto nla_put_failure;
1978
1979         genlmsg_end(msg, hdr);
1980         return 0;
1981
1982  nla_put_failure:
1983         genlmsg_cancel(msg, hdr);
1984         return -EMSGSIZE;
1985 }
1986
1987 /**
1988  * batadv_tt_global_dump_entry - Dump one TT global entry into a message
1989  * @msg: Netlink message to dump into
1990  * @portid: Port making netlink request
1991  * @seq: Sequence number of netlink message
1992  * @bat_priv: The bat priv with all the soft interface information
1993  * @common: tt local & tt global common data
1994  * @sub_s: Number of entries to skip
1995  *
1996  * This function assumes the caller holds rcu_read_lock().
1997  *
1998  * Return: Error code, or 0 on success
1999  */
2000 static int
2001 batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2002                             struct batadv_priv *bat_priv,
2003                             struct batadv_tt_common_entry *common, int *sub_s)
2004 {
2005         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
2006         struct batadv_tt_global_entry *global;
2007         struct hlist_head *head;
2008         int sub = 0;
2009         bool best;
2010
2011         global = container_of(common, struct batadv_tt_global_entry, common);
2012         best_entry = batadv_transtable_best_orig(bat_priv, global);
2013         head = &global->orig_list;
2014
2015         hlist_for_each_entry_rcu(orig_entry, head, list) {
2016                 if (sub++ < *sub_s)
2017                         continue;
2018
2019                 best = (orig_entry == best_entry);
2020
2021                 if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
2022                                                    orig_entry, best)) {
2023                         *sub_s = sub - 1;
2024                         return -EMSGSIZE;
2025                 }
2026         }
2027
2028         *sub_s = 0;
2029         return 0;
2030 }
2031
2032 /**
2033  * batadv_tt_global_dump_bucket - Dump one TT local bucket into a message
2034  * @msg: Netlink message to dump into
2035  * @portid: Port making netlink request
2036  * @seq: Sequence number of netlink message
2037  * @bat_priv: The bat priv with all the soft interface information
2038  * @head: Pointer to the list containing the global tt entries
2039  * @idx_s: Number of entries to skip
2040  * @sub: Number of entries to skip
2041  *
2042  * Return: Error code, or 0 on success
2043  */
2044 static int
2045 batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2046                              struct batadv_priv *bat_priv,
2047                              struct hlist_head *head, int *idx_s, int *sub)
2048 {
2049         struct batadv_tt_common_entry *common;
2050         int idx = 0;
2051
2052         rcu_read_lock();
2053         hlist_for_each_entry_rcu(common, head, hash_entry) {
2054                 if (idx++ < *idx_s)
2055                         continue;
2056
2057                 if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
2058                                                 common, sub)) {
2059                         rcu_read_unlock();
2060                         *idx_s = idx - 1;
2061                         return -EMSGSIZE;
2062                 }
2063         }
2064         rcu_read_unlock();
2065
2066         *idx_s = 0;
2067         *sub = 0;
2068         return 0;
2069 }
2070
2071 /**
2072  * batadv_tt_global_dump -  Dump TT global entries into a message
2073  * @msg: Netlink message to dump into
2074  * @cb: Parameters from query
2075  *
2076  * Return: Error code, or length of message on success
2077  */
2078 int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
2079 {
2080         struct net *net = sock_net(cb->skb->sk);
2081         struct net_device *soft_iface;
2082         struct batadv_priv *bat_priv;
2083         struct batadv_hard_iface *primary_if = NULL;
2084         struct batadv_hashtable *hash;
2085         struct hlist_head *head;
2086         int ret;
2087         int ifindex;
2088         int bucket = cb->args[0];
2089         int idx = cb->args[1];
2090         int sub = cb->args[2];
2091         int portid = NETLINK_CB(cb->skb).portid;
2092
2093         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
2094         if (!ifindex)
2095                 return -EINVAL;
2096
2097         soft_iface = dev_get_by_index(net, ifindex);
2098         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2099                 ret = -ENODEV;
2100                 goto out;
2101         }
2102
2103         bat_priv = netdev_priv(soft_iface);
2104
2105         primary_if = batadv_primary_if_get_selected(bat_priv);
2106         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2107                 ret = -ENOENT;
2108                 goto out;
2109         }
2110
2111         hash = bat_priv->tt.global_hash;
2112
2113         while (bucket < hash->size) {
2114                 head = &hash->table[bucket];
2115
2116                 if (batadv_tt_global_dump_bucket(msg, portid,
2117                                                  cb->nlh->nlmsg_seq, bat_priv,
2118                                                  head, &idx, &sub))
2119                         break;
2120
2121                 bucket++;
2122         }
2123
2124         ret = msg->len;
2125
2126  out:
2127         if (primary_if)
2128                 batadv_hardif_put(primary_if);
2129         if (soft_iface)
2130                 dev_put(soft_iface);
2131
2132         cb->args[0] = bucket;
2133         cb->args[1] = idx;
2134         cb->args[2] = sub;
2135
2136         return ret;
2137 }
2138
2139 /**
2140  * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
2141  * @tt_global_entry: the global entry to remove the orig_entry from
2142  * @orig_entry: the orig entry to remove and free
2143  *
2144  * Remove an orig_entry from its list in the given tt_global_entry and
2145  * free this orig_entry afterwards.
2146  *
2147  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
2148  * part of a list.
2149  */
2150 static void
2151 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
2152                                  struct batadv_tt_orig_list_entry *orig_entry)
2153 {
2154         lockdep_assert_held(&tt_global_entry->list_lock);
2155
2156         batadv_tt_global_size_dec(orig_entry->orig_node,
2157                                   tt_global_entry->common.vid);
2158         atomic_dec(&tt_global_entry->orig_list_count);
2159         /* requires holding tt_global_entry->list_lock and orig_entry->list
2160          * being part of a list
2161          */
2162         hlist_del_rcu(&orig_entry->list);
2163         batadv_tt_orig_list_entry_put(orig_entry);
2164 }
2165
2166 /* deletes the orig list of a tt_global_entry */
2167 static void
2168 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
2169 {
2170         struct hlist_head *head;
2171         struct hlist_node *safe;
2172         struct batadv_tt_orig_list_entry *orig_entry;
2173
2174         spin_lock_bh(&tt_global_entry->list_lock);
2175         head = &tt_global_entry->orig_list;
2176         hlist_for_each_entry_safe(orig_entry, safe, head, list)
2177                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
2178         spin_unlock_bh(&tt_global_entry->list_lock);
2179 }
2180
2181 /**
2182  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
2183  * @bat_priv: the bat priv with all the soft interface information
2184  * @tt_global_entry: the global entry to remove the orig_node from
2185  * @orig_node: the originator announcing the client
2186  * @message: message to append to the log on deletion
2187  *
2188  * Remove the given orig_node and its according orig_entry from the given
2189  * global tt entry.
2190  */
2191 static void
2192 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
2193                                struct batadv_tt_global_entry *tt_global_entry,
2194                                struct batadv_orig_node *orig_node,
2195                                const char *message)
2196 {
2197         struct hlist_head *head;
2198         struct hlist_node *safe;
2199         struct batadv_tt_orig_list_entry *orig_entry;
2200         unsigned short vid;
2201
2202         spin_lock_bh(&tt_global_entry->list_lock);
2203         head = &tt_global_entry->orig_list;
2204         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
2205                 if (orig_entry->orig_node == orig_node) {
2206                         vid = tt_global_entry->common.vid;
2207                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2208                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
2209                                    orig_node->orig,
2210                                    tt_global_entry->common.addr,
2211                                    BATADV_PRINT_VID(vid), message);
2212                         _batadv_tt_global_del_orig_entry(tt_global_entry,
2213                                                          orig_entry);
2214                 }
2215         }
2216         spin_unlock_bh(&tt_global_entry->list_lock);
2217 }
2218
2219 /* If the client is to be deleted, we check if it is the last origantor entry
2220  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
2221  * timer, otherwise we simply remove the originator scheduled for deletion.
2222  */
2223 static void
2224 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
2225                              struct batadv_tt_global_entry *tt_global_entry,
2226                              struct batadv_orig_node *orig_node,
2227                              const char *message)
2228 {
2229         bool last_entry = true;
2230         struct hlist_head *head;
2231         struct batadv_tt_orig_list_entry *orig_entry;
2232
2233         /* no local entry exists, case 1:
2234          * Check if this is the last one or if other entries exist.
2235          */
2236
2237         rcu_read_lock();
2238         head = &tt_global_entry->orig_list;
2239         hlist_for_each_entry_rcu(orig_entry, head, list) {
2240                 if (orig_entry->orig_node != orig_node) {
2241                         last_entry = false;
2242                         break;
2243                 }
2244         }
2245         rcu_read_unlock();
2246
2247         if (last_entry) {
2248                 /* its the last one, mark for roaming. */
2249                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
2250                 tt_global_entry->roam_at = jiffies;
2251         } else
2252                 /* there is another entry, we can simply delete this
2253                  * one and can still use the other one.
2254                  */
2255                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2256                                                orig_node, message);
2257 }
2258
2259 /**
2260  * batadv_tt_global_del - remove a client from the global table
2261  * @bat_priv: the bat priv with all the soft interface information
2262  * @orig_node: an originator serving this client
2263  * @addr: the mac address of the client
2264  * @vid: VLAN identifier
2265  * @message: a message explaining the reason for deleting the client to print
2266  *  for debugging purpose
2267  * @roaming: true if the deletion has been triggered by a roaming event
2268  */
2269 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
2270                                  struct batadv_orig_node *orig_node,
2271                                  const unsigned char *addr, unsigned short vid,
2272                                  const char *message, bool roaming)
2273 {
2274         struct batadv_tt_global_entry *tt_global_entry;
2275         struct batadv_tt_local_entry *local_entry = NULL;
2276
2277         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2278         if (!tt_global_entry)
2279                 goto out;
2280
2281         if (!roaming) {
2282                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2283                                                orig_node, message);
2284
2285                 if (hlist_empty(&tt_global_entry->orig_list))
2286                         batadv_tt_global_free(bat_priv, tt_global_entry,
2287                                               message);
2288
2289                 goto out;
2290         }
2291
2292         /* if we are deleting a global entry due to a roam
2293          * event, there are two possibilities:
2294          * 1) the client roamed from node A to node B => if there
2295          *    is only one originator left for this client, we mark
2296          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
2297          *    wait for node B to claim it. In case of timeout
2298          *    the entry is purged.
2299          *
2300          *    If there are other originators left, we directly delete
2301          *    the originator.
2302          * 2) the client roamed to us => we can directly delete
2303          *    the global entry, since it is useless now.
2304          */
2305         local_entry = batadv_tt_local_hash_find(bat_priv,
2306                                                 tt_global_entry->common.addr,
2307                                                 vid);
2308         if (local_entry) {
2309                 /* local entry exists, case 2: client roamed to us. */
2310                 batadv_tt_global_del_orig_list(tt_global_entry);
2311                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
2312         } else
2313                 /* no local entry exists, case 1: check for roaming */
2314                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
2315                                              orig_node, message);
2316
2317 out:
2318         if (tt_global_entry)
2319                 batadv_tt_global_entry_put(tt_global_entry);
2320         if (local_entry)
2321                 batadv_tt_local_entry_put(local_entry);
2322 }
2323
2324 /**
2325  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
2326  *  given originator matching the provided vid
2327  * @bat_priv: the bat priv with all the soft interface information
2328  * @orig_node: the originator owning the entries to remove
2329  * @match_vid: the VLAN identifier to match. If negative all the entries will be
2330  *  removed
2331  * @message: debug message to print as "reason"
2332  */
2333 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
2334                                struct batadv_orig_node *orig_node,
2335                                s32 match_vid,
2336                                const char *message)
2337 {
2338         struct batadv_tt_global_entry *tt_global;
2339         struct batadv_tt_common_entry *tt_common_entry;
2340         u32 i;
2341         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2342         struct hlist_node *safe;
2343         struct hlist_head *head;
2344         spinlock_t *list_lock; /* protects write access to the hash lists */
2345         unsigned short vid;
2346
2347         if (!hash)
2348                 return;
2349
2350         for (i = 0; i < hash->size; i++) {
2351                 head = &hash->table[i];
2352                 list_lock = &hash->list_locks[i];
2353
2354                 spin_lock_bh(list_lock);
2355                 hlist_for_each_entry_safe(tt_common_entry, safe,
2356                                           head, hash_entry) {
2357                         /* remove only matching entries */
2358                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
2359                                 continue;
2360
2361                         tt_global = container_of(tt_common_entry,
2362                                                  struct batadv_tt_global_entry,
2363                                                  common);
2364
2365                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
2366                                                        orig_node, message);
2367
2368                         if (hlist_empty(&tt_global->orig_list)) {
2369                                 vid = tt_global->common.vid;
2370                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
2371                                            "Deleting global tt entry %pM (vid: %d): %s\n",
2372                                            tt_global->common.addr,
2373                                            BATADV_PRINT_VID(vid), message);
2374                                 hlist_del_rcu(&tt_common_entry->hash_entry);
2375                                 batadv_tt_global_entry_put(tt_global);
2376                         }
2377                 }
2378                 spin_unlock_bh(list_lock);
2379         }
2380         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2381 }
2382
2383 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
2384                                       char **msg)
2385 {
2386         bool purge = false;
2387         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
2388         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
2389
2390         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
2391             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
2392                 purge = true;
2393                 *msg = "Roaming timeout\n";
2394         }
2395
2396         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
2397             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
2398                 purge = true;
2399                 *msg = "Temporary client timeout\n";
2400         }
2401
2402         return purge;
2403 }
2404
2405 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
2406 {
2407         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2408         struct hlist_head *head;
2409         struct hlist_node *node_tmp;
2410         spinlock_t *list_lock; /* protects write access to the hash lists */
2411         u32 i;
2412         char *msg = NULL;
2413         struct batadv_tt_common_entry *tt_common;
2414         struct batadv_tt_global_entry *tt_global;
2415
2416         for (i = 0; i < hash->size; i++) {
2417                 head = &hash->table[i];
2418                 list_lock = &hash->list_locks[i];
2419
2420                 spin_lock_bh(list_lock);
2421                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2422                                           hash_entry) {
2423                         tt_global = container_of(tt_common,
2424                                                  struct batadv_tt_global_entry,
2425                                                  common);
2426
2427                         if (!batadv_tt_global_to_purge(tt_global, &msg))
2428                                 continue;
2429
2430                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2431                                    "Deleting global tt entry %pM (vid: %d): %s\n",
2432                                    tt_global->common.addr,
2433                                    BATADV_PRINT_VID(tt_global->common.vid),
2434                                    msg);
2435
2436                         hlist_del_rcu(&tt_common->hash_entry);
2437
2438                         batadv_tt_global_entry_put(tt_global);
2439                 }
2440                 spin_unlock_bh(list_lock);
2441         }
2442 }
2443
2444 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2445 {
2446         struct batadv_hashtable *hash;
2447         spinlock_t *list_lock; /* protects write access to the hash lists */
2448         struct batadv_tt_common_entry *tt_common_entry;
2449         struct batadv_tt_global_entry *tt_global;
2450         struct hlist_node *node_tmp;
2451         struct hlist_head *head;
2452         u32 i;
2453
2454         if (!bat_priv->tt.global_hash)
2455                 return;
2456
2457         hash = bat_priv->tt.global_hash;
2458
2459         for (i = 0; i < hash->size; i++) {
2460                 head = &hash->table[i];
2461                 list_lock = &hash->list_locks[i];
2462
2463                 spin_lock_bh(list_lock);
2464                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2465                                           head, hash_entry) {
2466                         hlist_del_rcu(&tt_common_entry->hash_entry);
2467                         tt_global = container_of(tt_common_entry,
2468                                                  struct batadv_tt_global_entry,
2469                                                  common);
2470                         batadv_tt_global_entry_put(tt_global);
2471                 }
2472                 spin_unlock_bh(list_lock);
2473         }
2474
2475         batadv_hash_destroy(hash);
2476
2477         bat_priv->tt.global_hash = NULL;
2478 }
2479
2480 static bool
2481 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2482                        struct batadv_tt_global_entry *tt_global_entry)
2483 {
2484         bool ret = false;
2485
2486         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2487             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2488                 ret = true;
2489
2490         /* check if the two clients are marked as isolated */
2491         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2492             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2493                 ret = true;
2494
2495         return ret;
2496 }
2497
2498 /**
2499  * batadv_transtable_search - get the mesh destination for a given client
2500  * @bat_priv: the bat priv with all the soft interface information
2501  * @src: mac address of the source client
2502  * @addr: mac address of the destination client
2503  * @vid: VLAN identifier
2504  *
2505  * Return: a pointer to the originator that was selected as destination in the
2506  * mesh for contacting the client 'addr', NULL otherwise.
2507  * In case of multiple originators serving the same client, the function returns
2508  * the best one (best in terms of metric towards the destination node).
2509  *
2510  * If the two clients are AP isolated the function returns NULL.
2511  */
2512 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2513                                                   const u8 *src,
2514                                                   const u8 *addr,
2515                                                   unsigned short vid)
2516 {
2517         struct batadv_tt_local_entry *tt_local_entry = NULL;
2518         struct batadv_tt_global_entry *tt_global_entry = NULL;
2519         struct batadv_orig_node *orig_node = NULL;
2520         struct batadv_tt_orig_list_entry *best_entry;
2521
2522         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2523                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2524                 if (!tt_local_entry ||
2525                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2526                         goto out;
2527         }
2528
2529         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2530         if (!tt_global_entry)
2531                 goto out;
2532
2533         /* check whether the clients should not communicate due to AP
2534          * isolation
2535          */
2536         if (tt_local_entry &&
2537             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2538                 goto out;
2539
2540         rcu_read_lock();
2541         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2542         /* found anything? */
2543         if (best_entry)
2544                 orig_node = best_entry->orig_node;
2545         if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2546                 orig_node = NULL;
2547         rcu_read_unlock();
2548
2549 out:
2550         if (tt_global_entry)
2551                 batadv_tt_global_entry_put(tt_global_entry);
2552         if (tt_local_entry)
2553                 batadv_tt_local_entry_put(tt_local_entry);
2554
2555         return orig_node;
2556 }
2557
2558 /**
2559  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2560  *  to the given orig_node
2561  * @bat_priv: the bat priv with all the soft interface information
2562  * @orig_node: originator for which the CRC should be computed
2563  * @vid: VLAN identifier for which the CRC32 has to be computed
2564  *
2565  * This function computes the checksum for the global table corresponding to a
2566  * specific originator. In particular, the checksum is computed as follows: For
2567  * each client connected to the originator the CRC32C of the MAC address and the
2568  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2569  * together.
2570  *
2571  * The idea behind is that CRC32C should be used as much as possible in order to
2572  * produce a unique hash of the table, but since the order which is used to feed
2573  * the CRC32C function affects the result and since every node in the network
2574  * probably sorts the clients differently, the hash function cannot be directly
2575  * computed over the entire table. Hence the CRC32C is used only on
2576  * the single client entry, while all the results are then xor'ed together
2577  * because the XOR operation can combine them all while trying to reduce the
2578  * noise as much as possible.
2579  *
2580  * Return: the checksum of the global table of a given originator.
2581  */
2582 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2583                                 struct batadv_orig_node *orig_node,
2584                                 unsigned short vid)
2585 {
2586         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2587         struct batadv_tt_common_entry *tt_common;
2588         struct batadv_tt_global_entry *tt_global;
2589         struct hlist_head *head;
2590         u32 i, crc_tmp, crc = 0;
2591         u8 flags;
2592         __be16 tmp_vid;
2593
2594         for (i = 0; i < hash->size; i++) {
2595                 head = &hash->table[i];
2596
2597                 rcu_read_lock();
2598                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2599                         tt_global = container_of(tt_common,
2600                                                  struct batadv_tt_global_entry,
2601                                                  common);
2602                         /* compute the CRC only for entries belonging to the
2603                          * VLAN identified by the vid passed as parameter
2604                          */
2605                         if (tt_common->vid != vid)
2606                                 continue;
2607
2608                         /* Roaming clients are in the global table for
2609                          * consistency only. They don't have to be
2610                          * taken into account while computing the
2611                          * global crc
2612                          */
2613                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2614                                 continue;
2615                         /* Temporary clients have not been announced yet, so
2616                          * they have to be skipped while computing the global
2617                          * crc
2618                          */
2619                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2620                                 continue;
2621
2622                         /* find out if this global entry is announced by this
2623                          * originator
2624                          */
2625                         if (!batadv_tt_global_entry_has_orig(tt_global,
2626                                                              orig_node))
2627                                 continue;
2628
2629                         /* use network order to read the VID: this ensures that
2630                          * every node reads the bytes in the same order.
2631                          */
2632                         tmp_vid = htons(tt_common->vid);
2633                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2634
2635                         /* compute the CRC on flags that have to be kept in sync
2636                          * among nodes
2637                          */
2638                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2639                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2640
2641                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2642                 }
2643                 rcu_read_unlock();
2644         }
2645
2646         return crc;
2647 }
2648
2649 /**
2650  * batadv_tt_local_crc - calculates the checksum of the local table
2651  * @bat_priv: the bat priv with all the soft interface information
2652  * @vid: VLAN identifier for which the CRC32 has to be computed
2653  *
2654  * For details about the computation, please refer to the documentation for
2655  * batadv_tt_global_crc().
2656  *
2657  * Return: the checksum of the local table
2658  */
2659 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2660                                unsigned short vid)
2661 {
2662         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2663         struct batadv_tt_common_entry *tt_common;
2664         struct hlist_head *head;
2665         u32 i, crc_tmp, crc = 0;
2666         u8 flags;
2667         __be16 tmp_vid;
2668
2669         for (i = 0; i < hash->size; i++) {
2670                 head = &hash->table[i];
2671
2672                 rcu_read_lock();
2673                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2674                         /* compute the CRC only for entries belonging to the
2675                          * VLAN identified by vid
2676                          */
2677                         if (tt_common->vid != vid)
2678                                 continue;
2679
2680                         /* not yet committed clients have not to be taken into
2681                          * account while computing the CRC
2682                          */
2683                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2684                                 continue;
2685
2686                         /* use network order to read the VID: this ensures that
2687                          * every node reads the bytes in the same order.
2688                          */
2689                         tmp_vid = htons(tt_common->vid);
2690                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2691
2692                         /* compute the CRC on flags that have to be kept in sync
2693                          * among nodes
2694                          */
2695                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2696                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2697
2698                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2699                 }
2700                 rcu_read_unlock();
2701         }
2702
2703         return crc;
2704 }
2705
2706 /**
2707  * batadv_tt_req_node_release - free tt_req node entry
2708  * @ref: kref pointer of the tt req_node entry
2709  */
2710 static void batadv_tt_req_node_release(struct kref *ref)
2711 {
2712         struct batadv_tt_req_node *tt_req_node;
2713
2714         tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2715
2716         kmem_cache_free(batadv_tt_req_cache, tt_req_node);
2717 }
2718
2719 /**
2720  * batadv_tt_req_node_put - decrement the tt_req_node refcounter and
2721  *  possibly release it
2722  * @tt_req_node: tt_req_node to be free'd
2723  */
2724 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2725 {
2726         kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2727 }
2728
2729 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2730 {
2731         struct batadv_tt_req_node *node;
2732         struct hlist_node *safe;
2733
2734         spin_lock_bh(&bat_priv->tt.req_list_lock);
2735
2736         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2737                 hlist_del_init(&node->list);
2738                 batadv_tt_req_node_put(node);
2739         }
2740
2741         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2742 }
2743
2744 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2745                                        struct batadv_orig_node *orig_node,
2746                                        const void *tt_buff,
2747                                        u16 tt_buff_len)
2748 {
2749         /* Replace the old buffer only if I received something in the
2750          * last OGM (the OGM could carry no changes)
2751          */
2752         spin_lock_bh(&orig_node->tt_buff_lock);
2753         if (tt_buff_len > 0) {
2754                 kfree(orig_node->tt_buff);
2755                 orig_node->tt_buff_len = 0;
2756                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2757                 if (orig_node->tt_buff) {
2758                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2759                         orig_node->tt_buff_len = tt_buff_len;
2760                 }
2761         }
2762         spin_unlock_bh(&orig_node->tt_buff_lock);
2763 }
2764
2765 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2766 {
2767         struct batadv_tt_req_node *node;
2768         struct hlist_node *safe;
2769
2770         spin_lock_bh(&bat_priv->tt.req_list_lock);
2771         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2772                 if (batadv_has_timed_out(node->issued_at,
2773                                          BATADV_TT_REQUEST_TIMEOUT)) {
2774                         hlist_del_init(&node->list);
2775                         batadv_tt_req_node_put(node);
2776                 }
2777         }
2778         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2779 }
2780
2781 /**
2782  * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2783  * @bat_priv: the bat priv with all the soft interface information
2784  * @orig_node: orig node this request is being issued for
2785  *
2786  * Return: the pointer to the new tt_req_node struct if no request
2787  * has already been issued for this orig_node, NULL otherwise.
2788  */
2789 static struct batadv_tt_req_node *
2790 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2791                        struct batadv_orig_node *orig_node)
2792 {
2793         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2794
2795         spin_lock_bh(&bat_priv->tt.req_list_lock);
2796         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2797                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2798                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2799                                           BATADV_TT_REQUEST_TIMEOUT))
2800                         goto unlock;
2801         }
2802
2803         tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
2804         if (!tt_req_node)
2805                 goto unlock;
2806
2807         kref_init(&tt_req_node->refcount);
2808         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2809         tt_req_node->issued_at = jiffies;
2810
2811         kref_get(&tt_req_node->refcount);
2812         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2813 unlock:
2814         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2815         return tt_req_node;
2816 }
2817
2818 /**
2819  * batadv_tt_local_valid - verify that given tt entry is a valid one
2820  * @entry_ptr: to be checked local tt entry
2821  * @data_ptr: not used but definition required to satisfy the callback prototype
2822  *
2823  * Return: true if the entry is a valid, false otherwise.
2824  */
2825 static bool batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2826 {
2827         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2828
2829         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2830                 return false;
2831         return true;
2832 }
2833
2834 static bool batadv_tt_global_valid(const void *entry_ptr,
2835                                    const void *data_ptr)
2836 {
2837         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2838         const struct batadv_tt_global_entry *tt_global_entry;
2839         const struct batadv_orig_node *orig_node = data_ptr;
2840
2841         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2842             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2843                 return false;
2844
2845         tt_global_entry = container_of(tt_common_entry,
2846                                        struct batadv_tt_global_entry,
2847                                        common);
2848
2849         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2850 }
2851
2852 /**
2853  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2854  *  specified tt hash
2855  * @bat_priv: the bat priv with all the soft interface information
2856  * @hash: hash table containing the tt entries
2857  * @tt_len: expected tvlv tt data buffer length in number of bytes
2858  * @tvlv_buff: pointer to the buffer to fill with the TT data
2859  * @valid_cb: function to filter tt change entries
2860  * @cb_data: data passed to the filter function as argument
2861  */
2862 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2863                                     struct batadv_hashtable *hash,
2864                                     void *tvlv_buff, u16 tt_len,
2865                                     bool (*valid_cb)(const void *,
2866                                                      const void *),
2867                                     void *cb_data)
2868 {
2869         struct batadv_tt_common_entry *tt_common_entry;
2870         struct batadv_tvlv_tt_change *tt_change;
2871         struct hlist_head *head;
2872         u16 tt_tot, tt_num_entries = 0;
2873         u32 i;
2874
2875         tt_tot = batadv_tt_entries(tt_len);
2876         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2877
2878         rcu_read_lock();
2879         for (i = 0; i < hash->size; i++) {
2880                 head = &hash->table[i];
2881
2882                 hlist_for_each_entry_rcu(tt_common_entry,
2883                                          head, hash_entry) {
2884                         if (tt_tot == tt_num_entries)
2885                                 break;
2886
2887                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2888                                 continue;
2889
2890                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2891                         tt_change->flags = tt_common_entry->flags;
2892                         tt_change->vid = htons(tt_common_entry->vid);
2893                         memset(tt_change->reserved, 0,
2894                                sizeof(tt_change->reserved));
2895
2896                         tt_num_entries++;
2897                         tt_change++;
2898                 }
2899         }
2900         rcu_read_unlock();
2901 }
2902
2903 /**
2904  * batadv_tt_global_check_crc - check if all the CRCs are correct
2905  * @orig_node: originator for which the CRCs have to be checked
2906  * @tt_vlan: pointer to the first tvlv VLAN entry
2907  * @num_vlan: number of tvlv VLAN entries
2908  *
2909  * Return: true if all the received CRCs match the locally stored ones, false
2910  * otherwise
2911  */
2912 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2913                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2914                                        u16 num_vlan)
2915 {
2916         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2917         struct batadv_orig_node_vlan *vlan;
2918         int i, orig_num_vlan;
2919         u32 crc;
2920
2921         /* check if each received CRC matches the locally stored one */
2922         for (i = 0; i < num_vlan; i++) {
2923                 tt_vlan_tmp = tt_vlan + i;
2924
2925                 /* if orig_node is a backbone node for this VLAN, don't check
2926                  * the CRC as we ignore all the global entries over it
2927                  */
2928                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2929                                                    orig_node->orig,
2930                                                    ntohs(tt_vlan_tmp->vid)))
2931                         continue;
2932
2933                 vlan = batadv_orig_node_vlan_get(orig_node,
2934                                                  ntohs(tt_vlan_tmp->vid));
2935                 if (!vlan)
2936                         return false;
2937
2938                 crc = vlan->tt.crc;
2939                 batadv_orig_node_vlan_put(vlan);
2940
2941                 if (crc != ntohl(tt_vlan_tmp->crc))
2942                         return false;
2943         }
2944
2945         /* check if any excess VLANs exist locally for the originator
2946          * which are not mentioned in the TVLV from the originator.
2947          */
2948         rcu_read_lock();
2949         orig_num_vlan = 0;
2950         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2951                 orig_num_vlan++;
2952         rcu_read_unlock();
2953
2954         if (orig_num_vlan > num_vlan)
2955                 return false;
2956
2957         return true;
2958 }
2959
2960 /**
2961  * batadv_tt_local_update_crc - update all the local CRCs
2962  * @bat_priv: the bat priv with all the soft interface information
2963  */
2964 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2965 {
2966         struct batadv_softif_vlan *vlan;
2967
2968         /* recompute the global CRC for each VLAN */
2969         rcu_read_lock();
2970         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2971                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2972         }
2973         rcu_read_unlock();
2974 }
2975
2976 /**
2977  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2978  * @bat_priv: the bat priv with all the soft interface information
2979  * @orig_node: the orig_node for which the CRCs have to be updated
2980  */
2981 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2982                                         struct batadv_orig_node *orig_node)
2983 {
2984         struct batadv_orig_node_vlan *vlan;
2985         u32 crc;
2986
2987         /* recompute the global CRC for each VLAN */
2988         rcu_read_lock();
2989         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2990                 /* if orig_node is a backbone node for this VLAN, don't compute
2991                  * the CRC as we ignore all the global entries over it
2992                  */
2993                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2994                                                    vlan->vid))
2995                         continue;
2996
2997                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2998                 vlan->tt.crc = crc;
2999         }
3000         rcu_read_unlock();
3001 }
3002
3003 /**
3004  * batadv_send_tt_request - send a TT Request message to a given node
3005  * @bat_priv: the bat priv with all the soft interface information
3006  * @dst_orig_node: the destination of the message
3007  * @ttvn: the version number that the source of the message is looking for
3008  * @tt_vlan: pointer to the first tvlv VLAN object to request
3009  * @num_vlan: number of tvlv VLAN entries
3010  * @full_table: ask for the entire translation table if true, while only for the
3011  *  last TT diff otherwise
3012  *
3013  * Return: true if the TT Request was sent, false otherwise
3014  */
3015 static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
3016                                    struct batadv_orig_node *dst_orig_node,
3017                                    u8 ttvn,
3018                                    struct batadv_tvlv_tt_vlan_data *tt_vlan,
3019                                    u16 num_vlan, bool full_table)
3020 {
3021         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3022         struct batadv_tt_req_node *tt_req_node = NULL;
3023         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
3024         struct batadv_hard_iface *primary_if;
3025         bool ret = false;
3026         int i, size;
3027
3028         primary_if = batadv_primary_if_get_selected(bat_priv);
3029         if (!primary_if)
3030                 goto out;
3031
3032         /* The new tt_req will be issued only if I'm not waiting for a
3033          * reply from the same orig_node yet
3034          */
3035         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
3036         if (!tt_req_node)
3037                 goto out;
3038
3039         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
3040         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
3041         if (!tvlv_tt_data)
3042                 goto out;
3043
3044         tvlv_tt_data->flags = BATADV_TT_REQUEST;
3045         tvlv_tt_data->ttvn = ttvn;
3046         tvlv_tt_data->num_vlan = htons(num_vlan);
3047
3048         /* send all the CRCs within the request. This is needed by intermediate
3049          * nodes to ensure they have the correct table before replying
3050          */
3051         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
3052         for (i = 0; i < num_vlan; i++) {
3053                 tt_vlan_req->vid = tt_vlan->vid;
3054                 tt_vlan_req->crc = tt_vlan->crc;
3055
3056                 tt_vlan_req++;
3057                 tt_vlan++;
3058         }
3059
3060         if (full_table)
3061                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3062
3063         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
3064                    dst_orig_node->orig, full_table ? 'F' : '.');
3065
3066         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
3067         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3068                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
3069                                  tvlv_tt_data, size);
3070         ret = true;
3071
3072 out:
3073         if (primary_if)
3074                 batadv_hardif_put(primary_if);
3075
3076         if (ret && tt_req_node) {
3077                 spin_lock_bh(&bat_priv->tt.req_list_lock);
3078                 if (!hlist_unhashed(&tt_req_node->list)) {
3079                         hlist_del_init(&tt_req_node->list);
3080                         batadv_tt_req_node_put(tt_req_node);
3081                 }
3082                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3083         }
3084
3085         if (tt_req_node)
3086                 batadv_tt_req_node_put(tt_req_node);
3087
3088         kfree(tvlv_tt_data);
3089         return ret;
3090 }
3091
3092 /**
3093  * batadv_send_other_tt_response - send reply to tt request concerning another
3094  *  node's translation table
3095  * @bat_priv: the bat priv with all the soft interface information
3096  * @tt_data: tt data containing the tt request information
3097  * @req_src: mac address of tt request sender
3098  * @req_dst: mac address of tt request recipient
3099  *
3100  * Return: true if tt request reply was sent, false otherwise.
3101  */
3102 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
3103                                           struct batadv_tvlv_tt_data *tt_data,
3104                                           u8 *req_src, u8 *req_dst)
3105 {
3106         struct batadv_orig_node *req_dst_orig_node;
3107         struct batadv_orig_node *res_dst_orig_node = NULL;
3108         struct batadv_tvlv_tt_change *tt_change;
3109         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3110         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3111         bool ret = false, full_table;
3112         u8 orig_ttvn, req_ttvn;
3113         u16 tvlv_len;
3114         s32 tt_len;
3115
3116         batadv_dbg(BATADV_DBG_TT, bat_priv,
3117                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
3118                    req_src, tt_data->ttvn, req_dst,
3119                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3120
3121         /* Let's get the orig node of the REAL destination */
3122         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
3123         if (!req_dst_orig_node)
3124                 goto out;
3125
3126         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
3127         if (!res_dst_orig_node)
3128                 goto out;
3129
3130         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
3131         req_ttvn = tt_data->ttvn;
3132
3133         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3134         /* this node doesn't have the requested data */
3135         if (orig_ttvn != req_ttvn ||
3136             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
3137                                         ntohs(tt_data->num_vlan)))
3138                 goto out;
3139
3140         /* If the full table has been explicitly requested */
3141         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
3142             !req_dst_orig_node->tt_buff)
3143                 full_table = true;
3144         else
3145                 full_table = false;
3146
3147         /* TT fragmentation hasn't been implemented yet, so send as many
3148          * TT entries fit a single packet as possible only
3149          */
3150         if (!full_table) {
3151                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
3152                 tt_len = req_dst_orig_node->tt_buff_len;
3153
3154                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3155                                                               &tvlv_tt_data,
3156                                                               &tt_change,
3157                                                               &tt_len);
3158                 if (!tt_len)
3159                         goto unlock;
3160
3161                 /* Copy the last orig_node's OGM buffer */
3162                 memcpy(tt_change, req_dst_orig_node->tt_buff,
3163                        req_dst_orig_node->tt_buff_len);
3164                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3165         } else {
3166                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3167                  * in the initial part
3168                  */
3169                 tt_len = -1;
3170                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3171                                                               &tvlv_tt_data,
3172                                                               &tt_change,
3173                                                               &tt_len);
3174                 if (!tt_len)
3175                         goto out;
3176
3177                 /* fill the rest of the tvlv with the real TT entries */
3178                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
3179                                         tt_change, tt_len,
3180                                         batadv_tt_global_valid,
3181                                         req_dst_orig_node);
3182         }
3183
3184         /* Don't send the response, if larger than fragmented packet. */
3185         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
3186         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
3187                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
3188                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
3189                                          res_dst_orig_node->orig);
3190                 goto out;
3191         }
3192
3193         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3194         tvlv_tt_data->ttvn = req_ttvn;
3195
3196         if (full_table)
3197                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3198
3199         batadv_dbg(BATADV_DBG_TT, bat_priv,
3200                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
3201                    res_dst_orig_node->orig, req_dst_orig_node->orig,
3202                    full_table ? 'F' : '.', req_ttvn);
3203
3204         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3205
3206         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
3207                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3208                                  tvlv_len);
3209
3210         ret = true;
3211         goto out;
3212
3213 unlock:
3214         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3215
3216 out:
3217         if (res_dst_orig_node)
3218                 batadv_orig_node_put(res_dst_orig_node);
3219         if (req_dst_orig_node)
3220                 batadv_orig_node_put(req_dst_orig_node);
3221         kfree(tvlv_tt_data);
3222         return ret;
3223 }
3224
3225 /**
3226  * batadv_send_my_tt_response - send reply to tt request concerning this node's
3227  *  translation table
3228  * @bat_priv: the bat priv with all the soft interface information
3229  * @tt_data: tt data containing the tt request information
3230  * @req_src: mac address of tt request sender
3231  *
3232  * Return: true if tt request reply was sent, false otherwise.
3233  */
3234 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
3235                                        struct batadv_tvlv_tt_data *tt_data,
3236                                        u8 *req_src)
3237 {
3238         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3239         struct batadv_hard_iface *primary_if = NULL;
3240         struct batadv_tvlv_tt_change *tt_change;
3241         struct batadv_orig_node *orig_node;
3242         u8 my_ttvn, req_ttvn;
3243         u16 tvlv_len;
3244         bool full_table;
3245         s32 tt_len;
3246
3247         batadv_dbg(BATADV_DBG_TT, bat_priv,
3248                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
3249                    req_src, tt_data->ttvn,
3250                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3251
3252         spin_lock_bh(&bat_priv->tt.commit_lock);
3253
3254         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3255         req_ttvn = tt_data->ttvn;
3256
3257         orig_node = batadv_orig_hash_find(bat_priv, req_src);
3258         if (!orig_node)
3259                 goto out;
3260
3261         primary_if = batadv_primary_if_get_selected(bat_priv);
3262         if (!primary_if)
3263                 goto out;
3264
3265         /* If the full table has been explicitly requested or the gap
3266          * is too big send the whole local translation table
3267          */
3268         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
3269             !bat_priv->tt.last_changeset)
3270                 full_table = true;
3271         else
3272                 full_table = false;
3273
3274         /* TT fragmentation hasn't been implemented yet, so send as many
3275          * TT entries fit a single packet as possible only
3276          */
3277         if (!full_table) {
3278                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
3279
3280                 tt_len = bat_priv->tt.last_changeset_len;
3281                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3282                                                              &tvlv_tt_data,
3283                                                              &tt_change,
3284                                                              &tt_len);
3285                 if (!tt_len)
3286                         goto unlock;
3287
3288                 /* Copy the last orig_node's OGM buffer */
3289                 memcpy(tt_change, bat_priv->tt.last_changeset,
3290                        bat_priv->tt.last_changeset_len);
3291                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3292         } else {
3293                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3294
3295                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3296                  * in the initial part
3297                  */
3298                 tt_len = -1;
3299                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3300                                                              &tvlv_tt_data,
3301                                                              &tt_change,
3302                                                              &tt_len);
3303                 if (!tt_len)
3304                         goto out;
3305
3306                 /* fill the rest of the tvlv with the real TT entries */
3307                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
3308                                         tt_change, tt_len,
3309                                         batadv_tt_local_valid, NULL);
3310         }
3311
3312         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3313         tvlv_tt_data->ttvn = req_ttvn;
3314
3315         if (full_table)
3316                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3317
3318         batadv_dbg(BATADV_DBG_TT, bat_priv,
3319                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
3320                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
3321
3322         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3323
3324         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3325                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3326                                  tvlv_len);
3327
3328         goto out;
3329
3330 unlock:
3331         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3332 out:
3333         spin_unlock_bh(&bat_priv->tt.commit_lock);
3334         if (orig_node)
3335                 batadv_orig_node_put(orig_node);
3336         if (primary_if)
3337                 batadv_hardif_put(primary_if);
3338         kfree(tvlv_tt_data);
3339         /* The packet was for this host, so it doesn't need to be re-routed */
3340         return true;
3341 }
3342
3343 /**
3344  * batadv_send_tt_response - send reply to tt request
3345  * @bat_priv: the bat priv with all the soft interface information
3346  * @tt_data: tt data containing the tt request information
3347  * @req_src: mac address of tt request sender
3348  * @req_dst: mac address of tt request recipient
3349  *
3350  * Return: true if tt request reply was sent, false otherwise.
3351  */
3352 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
3353                                     struct batadv_tvlv_tt_data *tt_data,
3354                                     u8 *req_src, u8 *req_dst)
3355 {
3356         if (batadv_is_my_mac(bat_priv, req_dst))
3357                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
3358         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
3359                                              req_dst);
3360 }
3361
3362 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
3363                                       struct batadv_orig_node *orig_node,
3364                                       struct batadv_tvlv_tt_change *tt_change,
3365                                       u16 tt_num_changes, u8 ttvn)
3366 {
3367         int i;
3368         int roams;
3369
3370         for (i = 0; i < tt_num_changes; i++) {
3371                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
3372                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
3373                         batadv_tt_global_del(bat_priv, orig_node,
3374                                              (tt_change + i)->addr,
3375                                              ntohs((tt_change + i)->vid),
3376                                              "tt removed by changes",
3377                                              roams);
3378                 } else {
3379                         if (!batadv_tt_global_add(bat_priv, orig_node,
3380                                                   (tt_change + i)->addr,
3381                                                   ntohs((tt_change + i)->vid),
3382                                                   (tt_change + i)->flags, ttvn))
3383                                 /* In case of problem while storing a
3384                                  * global_entry, we stop the updating
3385                                  * procedure without committing the
3386                                  * ttvn change. This will avoid to send
3387                                  * corrupted data on tt_request
3388                                  */
3389                                 return;
3390                 }
3391         }
3392         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
3393 }
3394
3395 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
3396                                   struct batadv_tvlv_tt_change *tt_change,
3397                                   u8 ttvn, u8 *resp_src,
3398                                   u16 num_entries)
3399 {
3400         struct batadv_orig_node *orig_node;
3401
3402         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3403         if (!orig_node)
3404                 goto out;
3405
3406         /* Purge the old table first.. */
3407         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
3408                                   "Received full table");
3409
3410         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
3411                                   ttvn);
3412
3413         spin_lock_bh(&orig_node->tt_buff_lock);
3414         kfree(orig_node->tt_buff);
3415         orig_node->tt_buff_len = 0;
3416         orig_node->tt_buff = NULL;
3417         spin_unlock_bh(&orig_node->tt_buff_lock);
3418
3419         atomic_set(&orig_node->last_ttvn, ttvn);
3420
3421 out:
3422         if (orig_node)
3423                 batadv_orig_node_put(orig_node);
3424 }
3425
3426 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
3427                                      struct batadv_orig_node *orig_node,
3428                                      u16 tt_num_changes, u8 ttvn,
3429                                      struct batadv_tvlv_tt_change *tt_change)
3430 {
3431         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
3432                                   tt_num_changes, ttvn);
3433
3434         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3435                                    batadv_tt_len(tt_num_changes));
3436         atomic_set(&orig_node->last_ttvn, ttvn);
3437 }
3438
3439 /**
3440  * batadv_is_my_client - check if a client is served by the local node
3441  * @bat_priv: the bat priv with all the soft interface information
3442  * @addr: the mac address of the client to check
3443  * @vid: VLAN identifier
3444  *
3445  * Return: true if the client is served by this node, false otherwise.
3446  */
3447 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3448                          unsigned short vid)
3449 {
3450         struct batadv_tt_local_entry *tt_local_entry;
3451         bool ret = false;
3452
3453         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3454         if (!tt_local_entry)
3455                 goto out;
3456         /* Check if the client has been logically deleted (but is kept for
3457          * consistency purpose)
3458          */
3459         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3460             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3461                 goto out;
3462         ret = true;
3463 out:
3464         if (tt_local_entry)
3465                 batadv_tt_local_entry_put(tt_local_entry);
3466         return ret;
3467 }
3468
3469 /**
3470  * batadv_handle_tt_response - process incoming tt reply
3471  * @bat_priv: the bat priv with all the soft interface information
3472  * @tt_data: tt data containing the tt request information
3473  * @resp_src: mac address of tt reply sender
3474  * @num_entries: number of tt change entries appended to the tt data
3475  */
3476 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3477                                       struct batadv_tvlv_tt_data *tt_data,
3478                                       u8 *resp_src, u16 num_entries)
3479 {
3480         struct batadv_tt_req_node *node;
3481         struct hlist_node *safe;
3482         struct batadv_orig_node *orig_node = NULL;
3483         struct batadv_tvlv_tt_change *tt_change;
3484         u8 *tvlv_ptr = (u8 *)tt_data;
3485         u16 change_offset;
3486
3487         batadv_dbg(BATADV_DBG_TT, bat_priv,
3488                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3489                    resp_src, tt_data->ttvn, num_entries,
3490                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3491
3492         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3493         if (!orig_node)
3494                 goto out;
3495
3496         spin_lock_bh(&orig_node->tt_lock);
3497
3498         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3499         change_offset *= ntohs(tt_data->num_vlan);
3500         change_offset += sizeof(*tt_data);
3501         tvlv_ptr += change_offset;
3502
3503         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3504         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3505                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3506                                       resp_src, num_entries);
3507         } else {
3508                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3509                                          tt_data->ttvn, tt_change);
3510         }
3511
3512         /* Recalculate the CRC for this orig_node and store it */
3513         batadv_tt_global_update_crc(bat_priv, orig_node);
3514
3515         spin_unlock_bh(&orig_node->tt_lock);
3516
3517         /* Delete the tt_req_node from pending tt_requests list */
3518         spin_lock_bh(&bat_priv->tt.req_list_lock);
3519         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3520                 if (!batadv_compare_eth(node->addr, resp_src))
3521                         continue;
3522                 hlist_del_init(&node->list);
3523                 batadv_tt_req_node_put(node);
3524         }
3525
3526         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3527 out:
3528         if (orig_node)
3529                 batadv_orig_node_put(orig_node);
3530 }
3531
3532 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3533 {
3534         struct batadv_tt_roam_node *node, *safe;
3535
3536         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3537
3538         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3539                 list_del(&node->list);
3540                 kmem_cache_free(batadv_tt_roam_cache, node);
3541         }
3542
3543         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3544 }
3545
3546 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3547 {
3548         struct batadv_tt_roam_node *node, *safe;
3549
3550         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3551         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3552                 if (!batadv_has_timed_out(node->first_time,
3553                                           BATADV_ROAMING_MAX_TIME))
3554                         continue;
3555
3556                 list_del(&node->list);
3557                 kmem_cache_free(batadv_tt_roam_cache, node);
3558         }
3559         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3560 }
3561
3562 /**
3563  * batadv_tt_check_roam_count - check if a client has roamed too frequently
3564  * @bat_priv: the bat priv with all the soft interface information
3565  * @client: mac address of the roaming client
3566  *
3567  * This function checks whether the client already reached the
3568  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3569  * will not be sent.
3570  *
3571  * Return: true if the ROAMING_ADV can be sent, false otherwise
3572  */
3573 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3574 {
3575         struct batadv_tt_roam_node *tt_roam_node;
3576         bool ret = false;
3577
3578         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3579         /* The new tt_req will be issued only if I'm not waiting for a
3580          * reply from the same orig_node yet
3581          */
3582         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3583                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3584                         continue;
3585
3586                 if (batadv_has_timed_out(tt_roam_node->first_time,
3587                                          BATADV_ROAMING_MAX_TIME))
3588                         continue;
3589
3590                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3591                         /* Sorry, you roamed too many times! */
3592                         goto unlock;
3593                 ret = true;
3594                 break;
3595         }
3596
3597         if (!ret) {
3598                 tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
3599                                                 GFP_ATOMIC);
3600                 if (!tt_roam_node)
3601                         goto unlock;
3602
3603                 tt_roam_node->first_time = jiffies;
3604                 atomic_set(&tt_roam_node->counter,
3605                            BATADV_ROAMING_MAX_COUNT - 1);
3606                 ether_addr_copy(tt_roam_node->addr, client);
3607
3608                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3609                 ret = true;
3610         }
3611
3612 unlock:
3613         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3614         return ret;
3615 }
3616
3617 /**
3618  * batadv_send_roam_adv - send a roaming advertisement message
3619  * @bat_priv: the bat priv with all the soft interface information
3620  * @client: mac address of the roaming client
3621  * @vid: VLAN identifier
3622  * @orig_node: message destination
3623  *
3624  * Send a ROAMING_ADV message to the node which was previously serving this
3625  * client. This is done to inform the node that from now on all traffic destined
3626  * for this particular roamed client has to be forwarded to the sender of the
3627  * roaming message.
3628  */
3629 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3630                                  unsigned short vid,
3631                                  struct batadv_orig_node *orig_node)
3632 {
3633         struct batadv_hard_iface *primary_if;
3634         struct batadv_tvlv_roam_adv tvlv_roam;
3635
3636         primary_if = batadv_primary_if_get_selected(bat_priv);
3637         if (!primary_if)
3638                 goto out;
3639
3640         /* before going on we have to check whether the client has
3641          * already roamed to us too many times
3642          */
3643         if (!batadv_tt_check_roam_count(bat_priv, client))
3644                 goto out;
3645
3646         batadv_dbg(BATADV_DBG_TT, bat_priv,
3647                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3648                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3649
3650         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3651
3652         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3653         tvlv_roam.vid = htons(vid);
3654
3655         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3656                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3657                                  &tvlv_roam, sizeof(tvlv_roam));
3658
3659 out:
3660         if (primary_if)
3661                 batadv_hardif_put(primary_if);
3662 }
3663
3664 static void batadv_tt_purge(struct work_struct *work)
3665 {
3666         struct delayed_work *delayed_work;
3667         struct batadv_priv_tt *priv_tt;
3668         struct batadv_priv *bat_priv;
3669
3670         delayed_work = to_delayed_work(work);
3671         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3672         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3673
3674         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3675         batadv_tt_global_purge(bat_priv);
3676         batadv_tt_req_purge(bat_priv);
3677         batadv_tt_roam_purge(bat_priv);
3678
3679         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3680                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3681 }
3682
3683 void batadv_tt_free(struct batadv_priv *bat_priv)
3684 {
3685         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3686         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3687
3688         cancel_delayed_work_sync(&bat_priv->tt.work);
3689
3690         batadv_tt_local_table_free(bat_priv);
3691         batadv_tt_global_table_free(bat_priv);
3692         batadv_tt_req_list_free(bat_priv);
3693         batadv_tt_changes_list_free(bat_priv);
3694         batadv_tt_roam_list_free(bat_priv);
3695
3696         kfree(bat_priv->tt.last_changeset);
3697 }
3698
3699 /**
3700  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3701  *  table and possibly count them in the TT size
3702  * @bat_priv: the bat priv with all the soft interface information
3703  * @flags: the flag to switch
3704  * @enable: whether to set or unset the flag
3705  * @count: whether to increase the TT size by the number of changed entries
3706  */
3707 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3708                                       bool enable, bool count)
3709 {
3710         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3711         struct batadv_tt_common_entry *tt_common_entry;
3712         u16 changed_num = 0;
3713         struct hlist_head *head;
3714         u32 i;
3715
3716         if (!hash)
3717                 return;
3718
3719         for (i = 0; i < hash->size; i++) {
3720                 head = &hash->table[i];
3721
3722                 rcu_read_lock();
3723                 hlist_for_each_entry_rcu(tt_common_entry,
3724                                          head, hash_entry) {
3725                         if (enable) {
3726                                 if ((tt_common_entry->flags & flags) == flags)
3727                                         continue;
3728                                 tt_common_entry->flags |= flags;
3729                         } else {
3730                                 if (!(tt_common_entry->flags & flags))
3731                                         continue;
3732                                 tt_common_entry->flags &= ~flags;
3733                         }
3734                         changed_num++;
3735
3736                         if (!count)
3737                                 continue;
3738
3739                         batadv_tt_local_size_inc(bat_priv,
3740                                                  tt_common_entry->vid);
3741                 }
3742                 rcu_read_unlock();
3743         }
3744 }
3745
3746 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3747 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3748 {
3749         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3750         struct batadv_tt_common_entry *tt_common;
3751         struct batadv_tt_local_entry *tt_local;
3752         struct hlist_node *node_tmp;
3753         struct hlist_head *head;
3754         spinlock_t *list_lock; /* protects write access to the hash lists */
3755         u32 i;
3756
3757         if (!hash)
3758                 return;
3759
3760         for (i = 0; i < hash->size; i++) {
3761                 head = &hash->table[i];
3762                 list_lock = &hash->list_locks[i];
3763
3764                 spin_lock_bh(list_lock);
3765                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3766                                           hash_entry) {
3767                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3768                                 continue;
3769
3770                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3771                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3772                                    tt_common->addr,
3773                                    BATADV_PRINT_VID(tt_common->vid));
3774
3775                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3776                         hlist_del_rcu(&tt_common->hash_entry);
3777                         tt_local = container_of(tt_common,
3778                                                 struct batadv_tt_local_entry,
3779                                                 common);
3780
3781                         batadv_tt_local_entry_put(tt_local);
3782                 }
3783                 spin_unlock_bh(list_lock);
3784         }
3785 }
3786
3787 /**
3788  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3789  *  which have been queued in the time since the last commit
3790  * @bat_priv: the bat priv with all the soft interface information
3791  *
3792  * Caller must hold tt->commit_lock.
3793  */
3794 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3795 {
3796         lockdep_assert_held(&bat_priv->tt.commit_lock);
3797
3798         /* Update multicast addresses in local translation table */
3799         batadv_mcast_mla_update(bat_priv);
3800
3801         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3802                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3803                         batadv_tt_tvlv_container_update(bat_priv);
3804                 return;
3805         }
3806
3807         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3808
3809         batadv_tt_local_purge_pending_clients(bat_priv);
3810         batadv_tt_local_update_crc(bat_priv);
3811
3812         /* Increment the TTVN only once per OGM interval */
3813         atomic_inc(&bat_priv->tt.vn);
3814         batadv_dbg(BATADV_DBG_TT, bat_priv,
3815                    "Local changes committed, updating to ttvn %u\n",
3816                    (u8)atomic_read(&bat_priv->tt.vn));
3817
3818         /* reset the sending counter */
3819         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3820         batadv_tt_tvlv_container_update(bat_priv);
3821 }
3822
3823 /**
3824  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3825  *  have been queued in the time since the last commit
3826  * @bat_priv: the bat priv with all the soft interface information
3827  */
3828 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3829 {
3830         spin_lock_bh(&bat_priv->tt.commit_lock);
3831         batadv_tt_local_commit_changes_nolock(bat_priv);
3832         spin_unlock_bh(&bat_priv->tt.commit_lock);
3833 }
3834
3835 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3836                            unsigned short vid)
3837 {
3838         struct batadv_tt_local_entry *tt_local_entry = NULL;
3839         struct batadv_tt_global_entry *tt_global_entry = NULL;
3840         struct batadv_softif_vlan *vlan;
3841         bool ret = false;
3842
3843         vlan = batadv_softif_vlan_get(bat_priv, vid);
3844         if (!vlan)
3845                 return false;
3846
3847         if (!atomic_read(&vlan->ap_isolation))
3848                 goto out;
3849
3850         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3851         if (!tt_local_entry)
3852                 goto out;
3853
3854         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3855         if (!tt_global_entry)
3856                 goto out;
3857
3858         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3859                 goto out;
3860
3861         ret = true;
3862
3863 out:
3864         batadv_softif_vlan_put(vlan);
3865         if (tt_global_entry)
3866                 batadv_tt_global_entry_put(tt_global_entry);
3867         if (tt_local_entry)
3868                 batadv_tt_local_entry_put(tt_local_entry);
3869         return ret;
3870 }
3871
3872 /**
3873  * batadv_tt_update_orig - update global translation table with new tt
3874  *  information received via ogms
3875  * @bat_priv: the bat priv with all the soft interface information
3876  * @orig_node: the orig_node of the ogm
3877  * @tt_buff: pointer to the first tvlv VLAN entry
3878  * @tt_num_vlan: number of tvlv VLAN entries
3879  * @tt_change: pointer to the first entry in the TT buffer
3880  * @tt_num_changes: number of tt changes inside the tt buffer
3881  * @ttvn: translation table version number of this changeset
3882  */
3883 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3884                                   struct batadv_orig_node *orig_node,
3885                                   const void *tt_buff, u16 tt_num_vlan,
3886                                   struct batadv_tvlv_tt_change *tt_change,
3887                                   u16 tt_num_changes, u8 ttvn)
3888 {
3889         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3890         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3891         bool full_table = true;
3892         bool has_tt_init;
3893
3894         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3895         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3896                                &orig_node->capa_initialized);
3897
3898         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3899          * increased by one -> we can apply the attached changes
3900          */
3901         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3902                 /* the OGM could not contain the changes due to their size or
3903                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3904                  * times.
3905                  * In this case send a tt request
3906                  */
3907                 if (!tt_num_changes) {
3908                         full_table = false;
3909                         goto request_table;
3910                 }
3911
3912                 spin_lock_bh(&orig_node->tt_lock);
3913
3914                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3915                                          ttvn, tt_change);
3916
3917                 /* Even if we received the precomputed crc with the OGM, we
3918                  * prefer to recompute it to spot any possible inconsistency
3919                  * in the global table
3920                  */
3921                 batadv_tt_global_update_crc(bat_priv, orig_node);
3922
3923                 spin_unlock_bh(&orig_node->tt_lock);
3924
3925                 /* The ttvn alone is not enough to guarantee consistency
3926                  * because a single value could represent different states
3927                  * (due to the wrap around). Thus a node has to check whether
3928                  * the resulting table (after applying the changes) is still
3929                  * consistent or not. E.g. a node could disconnect while its
3930                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3931                  * checking the CRC value is mandatory to detect the
3932                  * inconsistency
3933                  */
3934                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3935                                                 tt_num_vlan))
3936                         goto request_table;
3937         } else {
3938                 /* if we missed more than one change or our tables are not
3939                  * in sync anymore -> request fresh tt data
3940                  */
3941                 if (!has_tt_init || ttvn != orig_ttvn ||
3942                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3943                                                 tt_num_vlan)) {
3944 request_table:
3945                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3946                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3947                                    orig_node->orig, ttvn, orig_ttvn,
3948                                    tt_num_changes);
3949                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3950                                                tt_vlan, tt_num_vlan,
3951                                                full_table);
3952                         return;
3953                 }
3954         }
3955 }
3956
3957 /**
3958  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3959  * @bat_priv: the bat priv with all the soft interface information
3960  * @addr: the mac address of the client to check
3961  * @vid: VLAN identifier
3962  *
3963  * Return: true if we know that the client has moved from its old originator
3964  * to another one. This entry is still kept for consistency purposes and will be
3965  * deleted later by a DEL or because of timeout
3966  */
3967 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3968                                         u8 *addr, unsigned short vid)
3969 {
3970         struct batadv_tt_global_entry *tt_global_entry;
3971         bool ret = false;
3972
3973         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3974         if (!tt_global_entry)
3975                 goto out;
3976
3977         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3978         batadv_tt_global_entry_put(tt_global_entry);
3979 out:
3980         return ret;
3981 }
3982
3983 /**
3984  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3985  * @bat_priv: the bat priv with all the soft interface information
3986  * @addr: the mac address of the local client to query
3987  * @vid: VLAN identifier
3988  *
3989  * Return: true if the local client is known to be roaming (it is not served by
3990  * this node anymore) or not. If yes, the client is still present in the table
3991  * to keep the latter consistent with the node TTVN
3992  */
3993 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3994                                        u8 *addr, unsigned short vid)
3995 {
3996         struct batadv_tt_local_entry *tt_local_entry;
3997         bool ret = false;
3998
3999         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
4000         if (!tt_local_entry)
4001                 goto out;
4002
4003         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4004         batadv_tt_local_entry_put(tt_local_entry);
4005 out:
4006         return ret;
4007 }
4008
4009 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
4010                                           struct batadv_orig_node *orig_node,
4011                                           const unsigned char *addr,
4012                                           unsigned short vid)
4013 {
4014         bool ret = false;
4015
4016         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
4017                                   BATADV_TT_CLIENT_TEMP,
4018                                   atomic_read(&orig_node->last_ttvn)))
4019                 goto out;
4020
4021         batadv_dbg(BATADV_DBG_TT, bat_priv,
4022                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
4023                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
4024         ret = true;
4025 out:
4026         return ret;
4027 }
4028
4029 /**
4030  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
4031  *  maximum packet size that can be transported through the mesh
4032  * @soft_iface: netdev struct of the mesh interface
4033  *
4034  * Remove entries older than 'timeout' and half timeout if more entries need
4035  * to be removed.
4036  */
4037 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
4038 {
4039         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
4040         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
4041         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
4042         bool reduced = false;
4043
4044         spin_lock_bh(&bat_priv->tt.commit_lock);
4045
4046         while (true) {
4047                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
4048                 if (packet_size_max >= table_size)
4049                         break;
4050
4051                 batadv_tt_local_purge(bat_priv, timeout);
4052                 batadv_tt_local_purge_pending_clients(bat_priv);
4053
4054                 timeout /= 2;
4055                 reduced = true;
4056                 net_ratelimited_function(batadv_info, soft_iface,
4057                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
4058                                          packet_size_max);
4059         }
4060
4061         /* commit these changes immediately, to avoid synchronization problem
4062          * with the TTVN
4063          */
4064         if (reduced)
4065                 batadv_tt_local_commit_changes_nolock(bat_priv);
4066
4067         spin_unlock_bh(&bat_priv->tt.commit_lock);
4068 }
4069
4070 /**
4071  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
4072  * @bat_priv: the bat priv with all the soft interface information
4073  * @orig: the orig_node of the ogm
4074  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
4075  * @tvlv_value: tvlv buffer containing the gateway data
4076  * @tvlv_value_len: tvlv buffer length
4077  */
4078 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
4079                                           struct batadv_orig_node *orig,
4080                                           u8 flags, void *tvlv_value,
4081                                           u16 tvlv_value_len)
4082 {
4083         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4084         struct batadv_tvlv_tt_change *tt_change;
4085         struct batadv_tvlv_tt_data *tt_data;
4086         u16 num_entries, num_vlan;
4087
4088         if (tvlv_value_len < sizeof(*tt_data))
4089                 return;
4090
4091         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4092         tvlv_value_len -= sizeof(*tt_data);
4093
4094         num_vlan = ntohs(tt_data->num_vlan);
4095
4096         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
4097                 return;
4098
4099         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
4100         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
4101         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
4102
4103         num_entries = batadv_tt_entries(tvlv_value_len);
4104
4105         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
4106                               num_entries, tt_data->ttvn);
4107 }
4108
4109 /**
4110  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
4111  *  container
4112  * @bat_priv: the bat priv with all the soft interface information
4113  * @src: mac address of tt tvlv sender
4114  * @dst: mac address of tt tvlv recipient
4115  * @tvlv_value: tvlv buffer containing the tt data
4116  * @tvlv_value_len: tvlv buffer length
4117  *
4118  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
4119  * otherwise.
4120  */
4121 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4122                                              u8 *src, u8 *dst,
4123                                              void *tvlv_value,
4124                                              u16 tvlv_value_len)
4125 {
4126         struct batadv_tvlv_tt_data *tt_data;
4127         u16 tt_vlan_len, tt_num_entries;
4128         char tt_flag;
4129         bool ret;
4130
4131         if (tvlv_value_len < sizeof(*tt_data))
4132                 return NET_RX_SUCCESS;
4133
4134         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4135         tvlv_value_len -= sizeof(*tt_data);
4136
4137         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
4138         tt_vlan_len *= ntohs(tt_data->num_vlan);
4139
4140         if (tvlv_value_len < tt_vlan_len)
4141                 return NET_RX_SUCCESS;
4142
4143         tvlv_value_len -= tt_vlan_len;
4144         tt_num_entries = batadv_tt_entries(tvlv_value_len);
4145
4146         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
4147         case BATADV_TT_REQUEST:
4148                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
4149
4150                 /* If this node cannot provide a TT response the tt_request is
4151                  * forwarded
4152                  */
4153                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
4154                 if (!ret) {
4155                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
4156                                 tt_flag = 'F';
4157                         else
4158                                 tt_flag = '.';
4159
4160                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4161                                    "Routing TT_REQUEST to %pM [%c]\n",
4162                                    dst, tt_flag);
4163                         /* tvlv API will re-route the packet */
4164                         return NET_RX_DROP;
4165                 }
4166                 break;
4167         case BATADV_TT_RESPONSE:
4168                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
4169
4170                 if (batadv_is_my_mac(bat_priv, dst)) {
4171                         batadv_handle_tt_response(bat_priv, tt_data,
4172                                                   src, tt_num_entries);
4173                         return NET_RX_SUCCESS;
4174                 }
4175
4176                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
4177                         tt_flag =  'F';
4178                 else
4179                         tt_flag = '.';
4180
4181                 batadv_dbg(BATADV_DBG_TT, bat_priv,
4182                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
4183
4184                 /* tvlv API will re-route the packet */
4185                 return NET_RX_DROP;
4186         }
4187
4188         return NET_RX_SUCCESS;
4189 }
4190
4191 /**
4192  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
4193  * @bat_priv: the bat priv with all the soft interface information
4194  * @src: mac address of tt tvlv sender
4195  * @dst: mac address of tt tvlv recipient
4196  * @tvlv_value: tvlv buffer containing the tt data
4197  * @tvlv_value_len: tvlv buffer length
4198  *
4199  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
4200  * otherwise.
4201  */
4202 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4203                                                u8 *src, u8 *dst,
4204                                                void *tvlv_value,
4205                                                u16 tvlv_value_len)
4206 {
4207         struct batadv_tvlv_roam_adv *roaming_adv;
4208         struct batadv_orig_node *orig_node = NULL;
4209
4210         /* If this node is not the intended recipient of the
4211          * roaming advertisement the packet is forwarded
4212          * (the tvlv API will re-route the packet).
4213          */
4214         if (!batadv_is_my_mac(bat_priv, dst))
4215                 return NET_RX_DROP;
4216
4217         if (tvlv_value_len < sizeof(*roaming_adv))
4218                 goto out;
4219
4220         orig_node = batadv_orig_hash_find(bat_priv, src);
4221         if (!orig_node)
4222                 goto out;
4223
4224         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
4225         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
4226
4227         batadv_dbg(BATADV_DBG_TT, bat_priv,
4228                    "Received ROAMING_ADV from %pM (client %pM)\n",
4229                    src, roaming_adv->client);
4230
4231         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
4232                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
4233                              atomic_read(&orig_node->last_ttvn) + 1);
4234
4235 out:
4236         if (orig_node)
4237                 batadv_orig_node_put(orig_node);
4238         return NET_RX_SUCCESS;
4239 }
4240
4241 /**
4242  * batadv_tt_init - initialise the translation table internals
4243  * @bat_priv: the bat priv with all the soft interface information
4244  *
4245  * Return: 0 on success or negative error number in case of failure.
4246  */
4247 int batadv_tt_init(struct batadv_priv *bat_priv)
4248 {
4249         int ret;
4250
4251         /* synchronized flags must be remote */
4252         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
4253
4254         ret = batadv_tt_local_init(bat_priv);
4255         if (ret < 0)
4256                 return ret;
4257
4258         ret = batadv_tt_global_init(bat_priv);
4259         if (ret < 0)
4260                 return ret;
4261
4262         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
4263                                      batadv_tt_tvlv_unicast_handler_v1,
4264                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
4265
4266         batadv_tvlv_handler_register(bat_priv, NULL,
4267                                      batadv_roam_tvlv_unicast_handler_v1,
4268                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
4269
4270         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
4271         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
4272                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
4273
4274         return 1;
4275 }
4276
4277 /**
4278  * batadv_tt_global_is_isolated - check if a client is marked as isolated
4279  * @bat_priv: the bat priv with all the soft interface information
4280  * @addr: the mac address of the client
4281  * @vid: the identifier of the VLAN where this client is connected
4282  *
4283  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
4284  * otherwise
4285  */
4286 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
4287                                   const u8 *addr, unsigned short vid)
4288 {
4289         struct batadv_tt_global_entry *tt;
4290         bool ret;
4291
4292         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
4293         if (!tt)
4294                 return false;
4295
4296         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
4297
4298         batadv_tt_global_entry_put(tt);
4299
4300         return ret;
4301 }
4302
4303 /**
4304  * batadv_tt_cache_init - Initialize tt memory object cache
4305  *
4306  * Return: 0 on success or negative error number in case of failure.
4307  */
4308 int __init batadv_tt_cache_init(void)
4309 {
4310         size_t tl_size = sizeof(struct batadv_tt_local_entry);
4311         size_t tg_size = sizeof(struct batadv_tt_global_entry);
4312         size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
4313         size_t tt_change_size = sizeof(struct batadv_tt_change_node);
4314         size_t tt_req_size = sizeof(struct batadv_tt_req_node);
4315         size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);
4316
4317         batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
4318                                             SLAB_HWCACHE_ALIGN, NULL);
4319         if (!batadv_tl_cache)
4320                 return -ENOMEM;
4321
4322         batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
4323                                             SLAB_HWCACHE_ALIGN, NULL);
4324         if (!batadv_tg_cache)
4325                 goto err_tt_tl_destroy;
4326
4327         batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
4328                                                  tt_orig_size, 0,
4329                                                  SLAB_HWCACHE_ALIGN, NULL);
4330         if (!batadv_tt_orig_cache)
4331                 goto err_tt_tg_destroy;
4332
4333         batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
4334                                                    tt_change_size, 0,
4335                                                    SLAB_HWCACHE_ALIGN, NULL);
4336         if (!batadv_tt_change_cache)
4337                 goto err_tt_orig_destroy;
4338
4339         batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
4340                                                 tt_req_size, 0,
4341                                                 SLAB_HWCACHE_ALIGN, NULL);
4342         if (!batadv_tt_req_cache)
4343                 goto err_tt_change_destroy;
4344
4345         batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
4346                                                  tt_roam_size, 0,
4347                                                  SLAB_HWCACHE_ALIGN, NULL);
4348         if (!batadv_tt_roam_cache)
4349                 goto err_tt_req_destroy;
4350
4351         return 0;
4352
4353 err_tt_req_destroy:
4354         kmem_cache_destroy(batadv_tt_req_cache);
4355         batadv_tt_req_cache = NULL;
4356 err_tt_change_destroy:
4357         kmem_cache_destroy(batadv_tt_change_cache);
4358         batadv_tt_change_cache = NULL;
4359 err_tt_orig_destroy:
4360         kmem_cache_destroy(batadv_tt_orig_cache);
4361         batadv_tt_orig_cache = NULL;
4362 err_tt_tg_destroy:
4363         kmem_cache_destroy(batadv_tg_cache);
4364         batadv_tg_cache = NULL;
4365 err_tt_tl_destroy:
4366         kmem_cache_destroy(batadv_tl_cache);
4367         batadv_tl_cache = NULL;
4368
4369         return -ENOMEM;
4370 }
4371
4372 /**
4373  * batadv_tt_cache_destroy - Destroy tt memory object cache
4374  */
4375 void batadv_tt_cache_destroy(void)
4376 {
4377         kmem_cache_destroy(batadv_tl_cache);
4378         kmem_cache_destroy(batadv_tg_cache);
4379         kmem_cache_destroy(batadv_tt_orig_cache);
4380         kmem_cache_destroy(batadv_tt_change_cache);
4381         kmem_cache_destroy(batadv_tt_req_cache);
4382         kmem_cache_destroy(batadv_tt_roam_cache);
4383 }