net/batman-adv/translation-table.c

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