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batman-adv: roaming handling mechanism redesign
[linux-2.6-block.git] / net / batman-adv / translation-table.c
CommitLineData
9cfc7bd6 1/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
c6c8fea2 2 *
35c133a0 3 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
c6c8fea2
SE		 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, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
c6c8fea2
SE		 18 */
19
20#include "main.h"
21#include "translation-table.h"
22#include "soft-interface.h"
32ae9b22 23#include "hard-interface.h"
a73105b8 24#include "send.h"
c6c8fea2
SE		 25#include "hash.h"
26#include "originator.h"
a73105b8 27#include "routing.h"
20ff9d59 28#include "bridge_loop_avoidance.h"
c6c8fea2 29
a73105b8
AQ		 30#include <linux/crc16.h>
31
56303d34
SE		 32static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
33 struct batadv_orig_node *orig_node);
a513088d
SE		 34static void batadv_tt_purge(struct work_struct *work);
35static void
56303d34 36batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
30cfd02b
AQ		 37static void batadv_tt_global_del(struct batadv_priv *bat_priv,
38 struct batadv_orig_node *orig_node,
39 const unsigned char *addr,
40 const char *message, bool roaming);
c6c8fea2 41
7aadf889 42/* returns 1 if they are the same mac addr */
a513088d 43static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
7aadf889 44{
56303d34 45 const void *data1 = container_of(node, struct batadv_tt_common_entry,
747e4221 46 hash_entry);
7aadf889
ML		 47
48 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
49}
50
56303d34 51static void batadv_tt_start_timer(struct batadv_priv *bat_priv)
c6c8fea2 52{
807736f6
SE		 53 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
54 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
a73105b8 55 msecs_to_jiffies(5000));
c6c8fea2
SE		 56}
57
56303d34 58static struct batadv_tt_common_entry *
5bf74e9c 59batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data)
7aadf889 60{
7aadf889
ML		 61 struct hlist_head *head;
62 struct hlist_node *node;
56303d34
SE		 63 struct batadv_tt_common_entry *tt_common_entry;
64 struct batadv_tt_common_entry *tt_common_entry_tmp = NULL;
c90681b8 65 uint32_t index;
7aadf889
ML		 66
67 if (!hash)
68 return NULL;
69
da641193 70 index = batadv_choose_orig(data, hash->size);
7aadf889
ML		 71 head = &hash->table[index];
72
73 rcu_read_lock();
48100bac 74 hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
1eda58bf 75 if (!batadv_compare_eth(tt_common_entry, data))
7aadf889
ML		 76 continue;
77
48100bac 78 if (!atomic_inc_not_zero(&tt_common_entry->refcount))
7683fdc1
AQ		 79 continue;
80
48100bac 81 tt_common_entry_tmp = tt_common_entry;
7aadf889
ML		 82 break;
83 }
84 rcu_read_unlock();
85
48100bac 86 return tt_common_entry_tmp;
7aadf889
ML		 87}
88
56303d34
SE		 89static struct batadv_tt_local_entry *
90batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data)
7aadf889 91{
56303d34
SE		 92 struct batadv_tt_common_entry *tt_common_entry;
93 struct batadv_tt_local_entry *tt_local_entry = NULL;
7aadf889 94
807736f6 95 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data);
48100bac
AQ		 96 if (tt_common_entry)
97 tt_local_entry = container_of(tt_common_entry,
56303d34
SE		 98 struct batadv_tt_local_entry,
99 common);
48100bac
AQ		 100 return tt_local_entry;
101}
7aadf889 102
56303d34
SE		 103static struct batadv_tt_global_entry *
104batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data)
48100bac 105{
56303d34
SE		 106 struct batadv_tt_common_entry *tt_common_entry;
107 struct batadv_tt_global_entry *tt_global_entry = NULL;
7683fdc1 108
807736f6 109 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data);
48100bac
AQ		 110 if (tt_common_entry)
111 tt_global_entry = container_of(tt_common_entry,
56303d34
SE		 112 struct batadv_tt_global_entry,
113 common);
48100bac 114 return tt_global_entry;
7aadf889 115
7aadf889
ML		 116}
117
a513088d 118static void
56303d34 119batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
7683fdc1 120{
48100bac
AQ		 121 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
122 kfree_rcu(tt_local_entry, common.rcu);
7683fdc1
AQ		 123}
124
a513088d 125static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
531027fc 126{
56303d34
SE		 127 struct batadv_tt_common_entry *tt_common_entry;
128 struct batadv_tt_global_entry *tt_global_entry;
531027fc 129
56303d34
SE		 130 tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu);
131 tt_global_entry = container_of(tt_common_entry,
132 struct batadv_tt_global_entry, common);
531027fc 133
531027fc
SW		 134 kfree(tt_global_entry);
135}
136
a513088d 137static void
56303d34 138batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
7683fdc1 139{
db08e6e5 140 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
a513088d 141 batadv_tt_global_del_orig_list(tt_global_entry);
48100bac 142 call_rcu(&tt_global_entry->common.rcu,
a513088d 143 batadv_tt_global_entry_free_rcu);
db08e6e5
SW		 144 }
145}
146
a513088d 147static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
db08e6e5 148{
56303d34 149 struct batadv_tt_orig_list_entry *orig_entry;
db08e6e5 150
56303d34 151 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
7d211efc 152 batadv_orig_node_free_ref(orig_entry->orig_node);
db08e6e5
SW		 153 kfree(orig_entry);
154}
155
a513088d 156static void
56303d34 157batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
db08e6e5 158{
d657e621
AQ		 159 if (!atomic_dec_and_test(&orig_entry->refcount))
160 return;
29cb99de
AQ		 161 /* to avoid race conditions, immediately decrease the tt counter */
162 atomic_dec(&orig_entry->orig_node->tt_size);
a513088d 163 call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
7683fdc1
AQ		 164}
165
56303d34 166static void batadv_tt_local_event(struct batadv_priv *bat_priv,
a513088d 167 const uint8_t *addr, uint8_t flags)
a73105b8 168{
56303d34 169 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
3b643de5
AQ		 170 bool event_removed = false;
171 bool del_op_requested, del_op_entry;
a73105b8
AQ		 172
173 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
174
175 if (!tt_change_node)
176 return;
177
ff66c975 178 tt_change_node->change.flags = flags;
a73105b8
AQ		 179 memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
180
acd34afa 181 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
3b643de5
AQ		 182
183 /* check for ADD+DEL or DEL+ADD events */
807736f6
SE		 184 spin_lock_bh(&bat_priv->tt.changes_list_lock);
185 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
3b643de5
AQ		 186 list) {
187 if (!batadv_compare_eth(entry->change.addr, addr))
188 continue;
189
190 /* DEL+ADD in the same orig interval have no effect and can be
191 * removed to avoid silly behaviour on the receiver side. The
192 * other way around (ADD+DEL) can happen in case of roaming of
193 * a client still in the NEW state. Roaming of NEW clients is
194 * now possible due to automatically recognition of "temporary"
195 * clients
196 */
acd34afa 197 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
3b643de5
AQ		 198 if (!del_op_requested && del_op_entry)
199 goto del;
200 if (del_op_requested && !del_op_entry)
201 goto del;
202 continue;
203del:
204 list_del(&entry->list);
205 kfree(entry);
155e4e12 206 kfree(tt_change_node);
3b643de5
AQ		 207 event_removed = true;
208 goto unlock;
209 }
210
a73105b8 211 /* track the change in the OGMinterval list */
807736f6 212 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
3b643de5
AQ		 213
214unlock:
807736f6 215 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
a73105b8 216
3b643de5 217 if (event_removed)
807736f6 218 atomic_dec(&bat_priv->tt.local_changes);
3b643de5 219 else
807736f6 220 atomic_inc(&bat_priv->tt.local_changes);
a73105b8
AQ		 221}
222
08c36d3e 223int batadv_tt_len(int changes_num)
a73105b8 224{
96412690 225 return changes_num * sizeof(struct batadv_tt_change);
a73105b8
AQ		 226}
227
56303d34 228static int batadv_tt_local_init(struct batadv_priv *bat_priv)
c6c8fea2 229{
807736f6 230 if (bat_priv->tt.local_hash)
5346c35e 231 return 0;
c6c8fea2 232
807736f6 233 bat_priv->tt.local_hash = batadv_hash_new(1024);
c6c8fea2 234
807736f6 235 if (!bat_priv->tt.local_hash)
5346c35e 236 return -ENOMEM;
c6c8fea2 237
5346c35e 238 return 0;
c6c8fea2
SE		 239}
240
068ee6e2
AQ		 241static void batadv_tt_global_free(struct batadv_priv *bat_priv,
242 struct batadv_tt_global_entry *tt_global,
243 const char *message)
244{
245 batadv_dbg(BATADV_DBG_TT, bat_priv,
246 "Deleting global tt entry %pM: %s\n",
247 tt_global->common.addr, message);
248
249 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
250 batadv_choose_orig, tt_global->common.addr);
251 batadv_tt_global_entry_free_ref(tt_global);
252
253}
254
08c36d3e
SE		 255void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
256 int ifindex)
c6c8fea2 257{
56303d34 258 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
47c94655
AQ		 259 struct batadv_tt_local_entry *tt_local = NULL;
260 struct batadv_tt_global_entry *tt_global = NULL;
db08e6e5
SW		 261 struct hlist_head *head;
262 struct hlist_node *node;
56303d34 263 struct batadv_tt_orig_list_entry *orig_entry;
80b3f58c 264 int hash_added;
068ee6e2 265 bool roamed_back = false;
c6c8fea2 266
47c94655 267 tt_local = batadv_tt_local_hash_find(bat_priv, addr);
068ee6e2 268 tt_global = batadv_tt_global_hash_find(bat_priv, addr);
c6c8fea2 269
47c94655
AQ		 270 if (tt_local) {
271 tt_local->last_seen = jiffies;
068ee6e2
AQ		 272 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
273 batadv_dbg(BATADV_DBG_TT, bat_priv,
274 "Re-adding pending client %pM\n", addr);
275 /* whatever the reason why the PENDING flag was set,
276 * this is a client which was enqueued to be removed in
277 * this orig_interval. Since it popped up again, the
278 * flag can be reset like it was never enqueued
279 */
280 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
281 goto add_event;
282 }
283
284 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
285 batadv_dbg(BATADV_DBG_TT, bat_priv,
286 "Roaming client %pM came back to its original location\n",
287 addr);
288 /* the ROAM flag is set because this client roamed away
289 * and the node got a roaming_advertisement message. Now
290 * that the client popped up again at its original
291 * location such flag can be unset
292 */
293 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
294 roamed_back = true;
295 }
296 goto check_roaming;
c6c8fea2
SE		 297 }
298
47c94655
AQ		 299 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
300 if (!tt_local)
7683fdc1 301 goto out;
a73105b8 302
39c75a51 303 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf 304 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
807736f6 305 (uint8_t)atomic_read(&bat_priv->tt.vn));
c6c8fea2 306
47c94655
AQ		 307 memcpy(tt_local->common.addr, addr, ETH_ALEN);
308 tt_local->common.flags = BATADV_NO_FLAGS;
9563877e 309 if (batadv_is_wifi_iface(ifindex))
47c94655
AQ		 310 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
311 atomic_set(&tt_local->common.refcount, 2);
312 tt_local->last_seen = jiffies;
313 tt_local->common.added_at = tt_local->last_seen;
c6c8fea2
SE		 314
315 /* the batman interface mac address should never be purged */
1eda58bf 316 if (batadv_compare_eth(addr, soft_iface->dev_addr))
47c94655 317 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
c6c8fea2 318
c40ed2bf
AQ		 319 /* The local entry has to be marked as NEW to avoid to send it in
320 * a full table response going out before the next ttvn increment
9cfc7bd6
SE		 321 * (consistency check)
322 */
47c94655 323 tt_local->common.flags |= BATADV_TT_CLIENT_NEW;
c40ed2bf 324
807736f6 325 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
47c94655
AQ		 326 batadv_choose_orig, &tt_local->common,
327 &tt_local->common.hash_entry);
80b3f58c
SW		 328
329 if (unlikely(hash_added != 0)) {
330 /* remove the reference for the hash */
47c94655 331 batadv_tt_local_entry_free_ref(tt_local);
80b3f58c
SW		 332 goto out;
333 }
334
068ee6e2 335add_event:
47c94655 336 batadv_tt_local_event(bat_priv, addr, tt_local->common.flags);
ff66c975 337
068ee6e2
AQ		 338check_roaming:
339 /* Check whether it is a roaming, but don't do anything if the roaming
340 * process has already been handled
341 */
342 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
db08e6e5 343 /* These node are probably going to update their tt table */
47c94655 344 head = &tt_global->orig_list;
db08e6e5
SW		 345 rcu_read_lock();
346 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
47c94655 347 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
a513088d 348 orig_entry->orig_node);
db08e6e5
SW		 349 }
350 rcu_read_unlock();
068ee6e2
AQ		 351 if (roamed_back) {
352 batadv_tt_global_free(bat_priv, tt_global,
353 "Roaming canceled");
354 tt_global = NULL;
355 } else {
356 /* The global entry has to be marked as ROAMING and
357 * has to be kept for consistency purpose
358 */
359 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
360 tt_global->roam_at = jiffies;
361 }
7683fdc1 362 }
068ee6e2 363
7683fdc1 364out:
47c94655
AQ		 365 if (tt_local)
366 batadv_tt_local_entry_free_ref(tt_local);
367 if (tt_global)
368 batadv_tt_global_entry_free_ref(tt_global);
c6c8fea2
SE		 369}
370
a513088d
SE		 371static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff,
372 int *packet_buff_len,
373 int min_packet_len,
374 int new_packet_len)
be9aa4c1
ML		 375{
376 unsigned char *new_buff;
377
378 new_buff = kmalloc(new_packet_len, GFP_ATOMIC);
379
380 /* keep old buffer if kmalloc should fail */
381 if (new_buff) {
382 memcpy(new_buff, *packet_buff, min_packet_len);
383 kfree(*packet_buff);
384 *packet_buff = new_buff;
385 *packet_buff_len = new_packet_len;
386 }
387}
388
56303d34 389static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv,
a513088d
SE		 390 unsigned char **packet_buff,
391 int *packet_buff_len,
392 int min_packet_len)
be9aa4c1 393{
56303d34 394 struct batadv_hard_iface *primary_if;
be9aa4c1
ML		 395 int req_len;
396
e5d89254 397 primary_if = batadv_primary_if_get_selected(bat_priv);
be9aa4c1
ML		 398
399 req_len = min_packet_len;
807736f6 400 req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
be9aa4c1
ML		 401
402 /* if we have too many changes for one packet don't send any
403 * and wait for the tt table request which will be fragmented
404 */
405 if ((!primary_if) || (req_len > primary_if->soft_iface->mtu))
406 req_len = min_packet_len;
407
a513088d
SE		 408 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
409 min_packet_len, req_len);
be9aa4c1
ML		 410
411 if (primary_if)
e5d89254 412 batadv_hardif_free_ref(primary_if);
be9aa4c1
ML		 413}
414
56303d34 415static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv,
a513088d
SE		 416 unsigned char **packet_buff,
417 int *packet_buff_len,
418 int min_packet_len)
c6c8fea2 419{
56303d34 420 struct batadv_tt_change_node *entry, *safe;
be9aa4c1
ML		 421 int count = 0, tot_changes = 0, new_len;
422 unsigned char *tt_buff;
423
a513088d
SE		 424 batadv_tt_prepare_packet_buff(bat_priv, packet_buff,
425 packet_buff_len, min_packet_len);
c6c8fea2 426
be9aa4c1
ML		 427 new_len = *packet_buff_len - min_packet_len;
428 tt_buff = *packet_buff + min_packet_len;
429
430 if (new_len > 0)
08c36d3e 431 tot_changes = new_len / batadv_tt_len(1);
c6c8fea2 432
807736f6
SE		 433 spin_lock_bh(&bat_priv->tt.changes_list_lock);
434 atomic_set(&bat_priv->tt.local_changes, 0);
c6c8fea2 435
807736f6 436 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
7c64fd98 437 list) {
a73105b8 438 if (count < tot_changes) {
08c36d3e 439 memcpy(tt_buff + batadv_tt_len(count),
96412690 440 &entry->change, sizeof(struct batadv_tt_change));
c6c8fea2
SE		 441 count++;
442 }
a73105b8
AQ		 443 list_del(&entry->list);
444 kfree(entry);
c6c8fea2 445 }
807736f6 446 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
a73105b8
AQ		 447
448 /* Keep the buffer for possible tt_request */
807736f6
SE		 449 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
450 kfree(bat_priv->tt.last_changeset);
451 bat_priv->tt.last_changeset_len = 0;
452 bat_priv->tt.last_changeset = NULL;
be9aa4c1
ML		 453 /* check whether this new OGM has no changes due to size problems */
454 if (new_len > 0) {
455 /* if kmalloc() fails we will reply with the full table
a73105b8
AQ		 456 * instead of providing the diff
457 */
807736f6
SE		 458 bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC);
459 if (bat_priv->tt.last_changeset) {
460 memcpy(bat_priv->tt.last_changeset, tt_buff, new_len);
461 bat_priv->tt.last_changeset_len = new_len;
a73105b8
AQ		 462 }
463 }
807736f6 464 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
c6c8fea2 465
08ad76ec 466 return count;
c6c8fea2
SE		 467}
468
08c36d3e 469int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
c6c8fea2
SE		 470{
471 struct net_device *net_dev = (struct net_device *)seq->private;
56303d34 472 struct batadv_priv *bat_priv = netdev_priv(net_dev);
807736f6 473 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
56303d34
SE		 474 struct batadv_tt_common_entry *tt_common_entry;
475 struct batadv_hard_iface *primary_if;
7aadf889 476 struct hlist_node *node;
c6c8fea2 477 struct hlist_head *head;
c90681b8 478 uint32_t i;
c6c8fea2 479
30da63a6
ML		 480 primary_if = batadv_seq_print_text_primary_if_get(seq);
481 if (!primary_if)
32ae9b22 482 goto out;
c6c8fea2 483
86ceb360
SE		 484 seq_printf(seq,
485 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
807736f6 486 net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
c6c8fea2 487
c6c8fea2
SE		 488 for (i = 0; i < hash->size; i++) {
489 head = &hash->table[i];
490
7aadf889 491 rcu_read_lock();
48100bac 492 hlist_for_each_entry_rcu(tt_common_entry, node,
7aadf889 493 head, hash_entry) {
d099c2c5 494 seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
7c64fd98
SE		 495 tt_common_entry->addr,
496 (tt_common_entry->flags &
acd34afa 497 BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
7c64fd98 498 (tt_common_entry->flags &
acd34afa 499 BATADV_TT_CLIENT_NOPURGE ? 'P' : '.'),
7c64fd98 500 (tt_common_entry->flags &
acd34afa 501 BATADV_TT_CLIENT_NEW ? 'N' : '.'),
7c64fd98 502 (tt_common_entry->flags &
acd34afa 503 BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
7c64fd98 504 (tt_common_entry->flags &
acd34afa 505 BATADV_TT_CLIENT_WIFI ? 'W' : '.'));
c6c8fea2 506 }
7aadf889 507 rcu_read_unlock();
c6c8fea2 508 }
32ae9b22
ML		 509out:
510 if (primary_if)
e5d89254 511 batadv_hardif_free_ref(primary_if);
30da63a6 512 return 0;
c6c8fea2
SE		 513}
514
56303d34
SE		 515static void
516batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
517 struct batadv_tt_local_entry *tt_local_entry,
518 uint16_t flags, const char *message)
c6c8fea2 519{
a513088d
SE		 520 batadv_tt_local_event(bat_priv, tt_local_entry->common.addr,
521 tt_local_entry->common.flags | flags);
a73105b8 522
015758d0
AQ		 523 /* The local client has to be marked as "pending to be removed" but has
524 * to be kept in the table in order to send it in a full table
9cfc7bd6
SE		 525 * response issued before the net ttvn increment (consistency check)
526 */
acd34afa 527 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
c566dbbe 528
39c75a51 529 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 530 "Local tt entry (%pM) pending to be removed: %s\n",
531 tt_local_entry->common.addr, message);
c6c8fea2
SE		 532}
533
7f91d06c
AQ		 534/**
535 * batadv_tt_local_remove - logically remove an entry from the local table
536 * @bat_priv: the bat priv with all the soft interface information
537 * @addr: the MAC address of the client to remove
538 * @message: message to append to the log on deletion
539 * @roaming: true if the deletion is due to a roaming event
540 *
541 * Returns the flags assigned to the local entry before being deleted
542 */
543uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
544 const uint8_t *addr, const char *message,
545 bool roaming)
c6c8fea2 546{
56303d34 547 struct batadv_tt_local_entry *tt_local_entry = NULL;
7f91d06c 548 uint16_t flags, curr_flags = BATADV_NO_FLAGS;
c6c8fea2 549
a513088d 550 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
7683fdc1
AQ		 551 if (!tt_local_entry)
552 goto out;
553
7f91d06c
AQ		 554 curr_flags = tt_local_entry->common.flags;
555
acd34afa 556 flags = BATADV_TT_CLIENT_DEL;
068ee6e2
AQ		 557 /* if this global entry addition is due to a roaming, the node has to
558 * mark the local entry as "roamed" in order to correctly reroute
559 * packets later
560 */
7c1fd91d 561 if (roaming) {
acd34afa 562 flags |= BATADV_TT_CLIENT_ROAM;
7c1fd91d
AQ		 563 /* mark the local client as ROAMed */
564 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
565 }
42d0b044 566
068ee6e2
AQ		 567 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
568 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
569 message);
570 goto out;
571 }
572 /* if this client has been added right now, it is possible to
573 * immediately purge it
574 */
575 batadv_tt_local_event(bat_priv, tt_local_entry->common.addr,
576 curr_flags | BATADV_TT_CLIENT_DEL);
577 hlist_del_rcu(&tt_local_entry->common.hash_entry);
578 batadv_tt_local_entry_free_ref(tt_local_entry);
7f91d06c 579
7683fdc1
AQ		 580out:
581 if (tt_local_entry)
a513088d 582 batadv_tt_local_entry_free_ref(tt_local_entry);
7f91d06c
AQ		 583
584 return curr_flags;
c6c8fea2
SE		 585}
586
56303d34 587static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
acd34afa 588 struct hlist_head *head)
c6c8fea2 589{
56303d34
SE		 590 struct batadv_tt_local_entry *tt_local_entry;
591 struct batadv_tt_common_entry *tt_common_entry;
7aadf889 592 struct hlist_node *node, *node_tmp;
acd34afa
SE		 593
594 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head,
595 hash_entry) {
596 tt_local_entry = container_of(tt_common_entry,
56303d34
SE		 597 struct batadv_tt_local_entry,
598 common);
acd34afa
SE		 599 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
600 continue;
601
602 /* entry already marked for deletion */
603 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
604 continue;
605
606 if (!batadv_has_timed_out(tt_local_entry->last_seen,
607 BATADV_TT_LOCAL_TIMEOUT))
608 continue;
609
610 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
611 BATADV_TT_CLIENT_DEL, "timed out");
612 }
613}
614
56303d34 615static void batadv_tt_local_purge(struct batadv_priv *bat_priv)
acd34afa 616{
807736f6 617 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
c6c8fea2 618 struct hlist_head *head;
7683fdc1 619 spinlock_t *list_lock; /* protects write access to the hash lists */
c90681b8 620 uint32_t i;
c6c8fea2 621
c6c8fea2
SE		 622 for (i = 0; i < hash->size; i++) {
623 head = &hash->table[i];
7683fdc1 624 list_lock = &hash->list_locks[i];
c6c8fea2 625
7683fdc1 626 spin_lock_bh(list_lock);
acd34afa 627 batadv_tt_local_purge_list(bat_priv, head);
7683fdc1 628 spin_unlock_bh(list_lock);
c6c8fea2
SE		 629 }
630
c6c8fea2
SE		 631}
632
56303d34 633static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
c6c8fea2 634{
5bf74e9c 635 struct batadv_hashtable *hash;
a73105b8 636 spinlock_t *list_lock; /* protects write access to the hash lists */
56303d34
SE		 637 struct batadv_tt_common_entry *tt_common_entry;
638 struct batadv_tt_local_entry *tt_local;
7683fdc1
AQ		 639 struct hlist_node *node, *node_tmp;
640 struct hlist_head *head;
c90681b8 641 uint32_t i;
a73105b8 642
807736f6 643 if (!bat_priv->tt.local_hash)
c6c8fea2
SE		 644 return;
645
807736f6 646 hash = bat_priv->tt.local_hash;
a73105b8
AQ		 647
648 for (i = 0; i < hash->size; i++) {
649 head = &hash->table[i];
650 list_lock = &hash->list_locks[i];
651
652 spin_lock_bh(list_lock);
48100bac 653 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
a73105b8
AQ		 654 head, hash_entry) {
655 hlist_del_rcu(node);
56303d34
SE		 656 tt_local = container_of(tt_common_entry,
657 struct batadv_tt_local_entry,
658 common);
659 batadv_tt_local_entry_free_ref(tt_local);
a73105b8
AQ		 660 }
661 spin_unlock_bh(list_lock);
662 }
663
1a8eaf07 664 batadv_hash_destroy(hash);
a73105b8 665
807736f6 666 bat_priv->tt.local_hash = NULL;
c6c8fea2
SE		 667}
668
56303d34 669static int batadv_tt_global_init(struct batadv_priv *bat_priv)
c6c8fea2 670{
807736f6 671 if (bat_priv->tt.global_hash)
5346c35e 672 return 0;
c6c8fea2 673
807736f6 674 bat_priv->tt.global_hash = batadv_hash_new(1024);
c6c8fea2 675
807736f6 676 if (!bat_priv->tt.global_hash)
5346c35e 677 return -ENOMEM;
c6c8fea2 678
5346c35e 679 return 0;
c6c8fea2
SE		 680}
681
56303d34 682static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
c6c8fea2 683{
56303d34 684 struct batadv_tt_change_node *entry, *safe;
c6c8fea2 685
807736f6 686 spin_lock_bh(&bat_priv->tt.changes_list_lock);
c6c8fea2 687
807736f6 688 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
a73105b8
AQ		 689 list) {
690 list_del(&entry->list);
691 kfree(entry);
692 }
c6c8fea2 693
807736f6
SE		 694 atomic_set(&bat_priv->tt.local_changes, 0);
695 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
a73105b8 696}
c6c8fea2 697
d657e621
AQ		 698/* retrieves the orig_tt_list_entry belonging to orig_node from the
699 * batadv_tt_global_entry list
700 *
701 * returns it with an increased refcounter, NULL if not found
db08e6e5 702 */
d657e621
AQ		 703static struct batadv_tt_orig_list_entry *
704batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
705 const struct batadv_orig_node *orig_node)
db08e6e5 706{
d657e621 707 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
db08e6e5
SW		 708 const struct hlist_head *head;
709 struct hlist_node *node;
db08e6e5
SW		 710
711 rcu_read_lock();
712 head = &entry->orig_list;
713 hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
d657e621
AQ		 714 if (tmp_orig_entry->orig_node != orig_node)
715 continue;
716 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
717 continue;
718
719 orig_entry = tmp_orig_entry;
720 break;
db08e6e5
SW		 721 }
722 rcu_read_unlock();
d657e621
AQ		 723
724 return orig_entry;
725}
726
727/* find out if an orig_node is already in the list of a tt_global_entry.
728 * returns true if found, false otherwise
729 */
730static bool
731batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
732 const struct batadv_orig_node *orig_node)
733{
734 struct batadv_tt_orig_list_entry *orig_entry;
735 bool found = false;
736
737 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
738 if (orig_entry) {
739 found = true;
740 batadv_tt_orig_list_entry_free_ref(orig_entry);
741 }
742
db08e6e5
SW		 743 return found;
744}
745
a513088d 746static void
d657e621 747batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
56303d34 748 struct batadv_orig_node *orig_node, int ttvn)
db08e6e5 749{
56303d34 750 struct batadv_tt_orig_list_entry *orig_entry;
db08e6e5 751
d657e621 752 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
30cfd02b
AQ		 753 if (orig_entry) {
754 /* refresh the ttvn: the current value could be a bogus one that
755 * was added during a "temporary client detection"
756 */
757 orig_entry->ttvn = ttvn;
d657e621 758 goto out;
30cfd02b 759 }
d657e621 760
db08e6e5
SW		 761 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
762 if (!orig_entry)
d657e621 763 goto out;
db08e6e5
SW		 764
765 INIT_HLIST_NODE(&orig_entry->list);
766 atomic_inc(&orig_node->refcount);
767 atomic_inc(&orig_node->tt_size);
768 orig_entry->orig_node = orig_node;
769 orig_entry->ttvn = ttvn;
d657e621 770 atomic_set(&orig_entry->refcount, 2);
db08e6e5 771
d657e621 772 spin_lock_bh(&tt_global->list_lock);
db08e6e5 773 hlist_add_head_rcu(&orig_entry->list,
d657e621
AQ		 774 &tt_global->orig_list);
775 spin_unlock_bh(&tt_global->list_lock);
776out:
777 if (orig_entry)
778 batadv_tt_orig_list_entry_free_ref(orig_entry);
db08e6e5
SW		 779}
780
a73105b8 781/* caller must hold orig_node refcount */
56303d34
SE		 782int batadv_tt_global_add(struct batadv_priv *bat_priv,
783 struct batadv_orig_node *orig_node,
d4f44692
AQ		 784 const unsigned char *tt_addr, uint8_t flags,
785 uint8_t ttvn)
a73105b8 786{
56303d34 787 struct batadv_tt_global_entry *tt_global_entry = NULL;
068ee6e2 788 struct batadv_tt_local_entry *tt_local_entry = NULL;
7683fdc1 789 int ret = 0;
80b3f58c 790 int hash_added;
56303d34 791 struct batadv_tt_common_entry *common;
7f91d06c 792 uint16_t local_flags;
c6c8fea2 793
a513088d 794 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr);
068ee6e2
AQ		 795 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr);
796
797 /* if the node already has a local client for this entry, it has to wait
798 * for a roaming advertisement instead of manually messing up the global
799 * table
800 */
801 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
802 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
803 goto out;
a73105b8
AQ		 804
805 if (!tt_global_entry) {
d4f44692 806 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
a73105b8 807 if (!tt_global_entry)
7683fdc1
AQ		 808 goto out;
809
c0a55929
SE		 810 common = &tt_global_entry->common;
811 memcpy(common->addr, tt_addr, ETH_ALEN);
db08e6e5 812
d4f44692 813 common->flags = flags;
cc47f66e 814 tt_global_entry->roam_at = 0;
fdf79320
AQ		 815 /* node must store current time in case of roaming. This is
816 * needed to purge this entry out on timeout (if nobody claims
817 * it)
818 */
819 if (flags & BATADV_TT_CLIENT_ROAM)
820 tt_global_entry->roam_at = jiffies;
c0a55929 821 atomic_set(&common->refcount, 2);
30cfd02b 822 common->added_at = jiffies;
db08e6e5
SW		 823
824 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
825 spin_lock_init(&tt_global_entry->list_lock);
7683fdc1 826
807736f6 827 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
a513088d
SE		 828 batadv_compare_tt,
829 batadv_choose_orig, common,
830 &common->hash_entry);
80b3f58c
SW		 831
832 if (unlikely(hash_added != 0)) {
833 /* remove the reference for the hash */
a513088d 834 batadv_tt_global_entry_free_ref(tt_global_entry);
80b3f58c
SW		 835 goto out_remove;
836 }
a73105b8 837 } else {
068ee6e2 838 common = &tt_global_entry->common;
30cfd02b
AQ		 839 /* If there is already a global entry, we can use this one for
840 * our processing.
068ee6e2
AQ		 841 * But if we are trying to add a temporary client then here are
842 * two options at this point:
843 * 1) the global client is not a temporary client: the global
844 * client has to be left as it is, temporary information
845 * should never override any already known client state
846 * 2) the global client is a temporary client: purge the
847 * originator list and add the new one orig_entry
30cfd02b 848 */
068ee6e2
AQ		 849 if (flags & BATADV_TT_CLIENT_TEMP) {
850 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
851 goto out;
852 if (batadv_tt_global_entry_has_orig(tt_global_entry,
853 orig_node))
854 goto out_remove;
855 batadv_tt_global_del_orig_list(tt_global_entry);
856 goto add_orig_entry;
857 }
30cfd02b
AQ		 858
859 /* if the client was temporary added before receiving the first
860 * OGM announcing it, we have to clear the TEMP flag
861 */
068ee6e2 862 common->flags &= ~BATADV_TT_CLIENT_TEMP;
db08e6e5 863
acd34afa
SE		 864 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
865 * one originator left in the list and we previously received a
db08e6e5
SW		 866 * delete + roaming change for this originator.
867 *
868 * We should first delete the old originator before adding the
869 * new one.
870 */
068ee6e2 871 if (common->flags & BATADV_TT_CLIENT_ROAM) {
a513088d 872 batadv_tt_global_del_orig_list(tt_global_entry);
068ee6e2 873 common->flags &= ~BATADV_TT_CLIENT_ROAM;
db08e6e5 874 tt_global_entry->roam_at = 0;
a73105b8
AQ		 875 }
876 }
068ee6e2 877add_orig_entry:
30cfd02b 878 /* add the new orig_entry (if needed) or update it */
d657e621 879 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
c6c8fea2 880
39c75a51 881 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf 882 "Creating new global tt entry: %pM (via %pM)\n",
068ee6e2 883 common->addr, orig_node->orig);
c10dba05 884 ret = 1;
c6c8fea2 885
80b3f58c 886out_remove:
7f91d06c 887
a73105b8 888 /* remove address from local hash if present */
7f91d06c
AQ		 889 local_flags = batadv_tt_local_remove(bat_priv, tt_addr,
890 "global tt received",
068ee6e2 891 !!(flags & BATADV_TT_CLIENT_ROAM));
7f91d06c
AQ		 892 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
893
068ee6e2
AQ		 894 if (!(flags & BATADV_TT_CLIENT_ROAM))
895 /* this is a normal global add. Therefore the client is not in a
896 * roaming state anymore.
897 */
898 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
899
7683fdc1
AQ		 900out:
901 if (tt_global_entry)
a513088d 902 batadv_tt_global_entry_free_ref(tt_global_entry);
068ee6e2
AQ		 903 if (tt_local_entry)
904 batadv_tt_local_entry_free_ref(tt_local_entry);
7683fdc1 905 return ret;
c6c8fea2
SE		 906}
907
db08e6e5
SW		 908/* print all orig nodes who announce the address for this global entry.
909 * it is assumed that the caller holds rcu_read_lock();
910 */
a513088d 911static void
56303d34 912batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry,
a513088d 913 struct seq_file *seq)
db08e6e5
SW		 914{
915 struct hlist_head *head;
916 struct hlist_node *node;
56303d34
SE		 917 struct batadv_tt_orig_list_entry *orig_entry;
918 struct batadv_tt_common_entry *tt_common_entry;
db08e6e5
SW		 919 uint16_t flags;
920 uint8_t last_ttvn;
921
922 tt_common_entry = &tt_global_entry->common;
923
924 head = &tt_global_entry->orig_list;
925
926 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
927 flags = tt_common_entry->flags;
928 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
30cfd02b 929 seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c%c]\n",
db08e6e5
SW		 930 tt_global_entry->common.addr, orig_entry->ttvn,
931 orig_entry->orig_node->orig, last_ttvn,
acd34afa 932 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
30cfd02b
AQ		 933 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
934 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
db08e6e5
SW		 935 }
936}
937
08c36d3e 938int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
c6c8fea2
SE		 939{
940 struct net_device *net_dev = (struct net_device *)seq->private;
56303d34 941 struct batadv_priv *bat_priv = netdev_priv(net_dev);
807736f6 942 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
56303d34
SE		 943 struct batadv_tt_common_entry *tt_common_entry;
944 struct batadv_tt_global_entry *tt_global;
945 struct batadv_hard_iface *primary_if;
7aadf889 946 struct hlist_node *node;
c6c8fea2 947 struct hlist_head *head;
c90681b8 948 uint32_t i;
c6c8fea2 949
30da63a6
ML		 950 primary_if = batadv_seq_print_text_primary_if_get(seq);
951 if (!primary_if)
32ae9b22 952 goto out;
c6c8fea2 953
2dafb49d
AQ		 954 seq_printf(seq,
955 "Globally announced TT entries received via the mesh %s\n",
c6c8fea2 956 net_dev->name);
df6edb9e
AQ		 957 seq_printf(seq, " %-13s %s %-15s %s %s\n",
958 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
c6c8fea2 959
c6c8fea2
SE		 960 for (i = 0; i < hash->size; i++) {
961 head = &hash->table[i];
962
7aadf889 963 rcu_read_lock();
48100bac 964 hlist_for_each_entry_rcu(tt_common_entry, node,
7aadf889 965 head, hash_entry) {
56303d34
SE		 966 tt_global = container_of(tt_common_entry,
967 struct batadv_tt_global_entry,
968 common);
969 batadv_tt_global_print_entry(tt_global, seq);
c6c8fea2 970 }
7aadf889 971 rcu_read_unlock();
c6c8fea2 972 }
32ae9b22
ML		 973out:
974 if (primary_if)
e5d89254 975 batadv_hardif_free_ref(primary_if);
30da63a6 976 return 0;
c6c8fea2
SE		 977}
978
db08e6e5 979/* deletes the orig list of a tt_global_entry */
a513088d 980static void
56303d34 981batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
c6c8fea2 982{
db08e6e5
SW		 983 struct hlist_head *head;
984 struct hlist_node *node, *safe;
56303d34 985 struct batadv_tt_orig_list_entry *orig_entry;
a73105b8 986
db08e6e5
SW		 987 spin_lock_bh(&tt_global_entry->list_lock);
988 head = &tt_global_entry->orig_list;
989 hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
990 hlist_del_rcu(node);
a513088d 991 batadv_tt_orig_list_entry_free_ref(orig_entry);
db08e6e5
SW		 992 }
993 spin_unlock_bh(&tt_global_entry->list_lock);
c6c8fea2 994
db08e6e5
SW		 995}
996
a513088d 997static void
56303d34
SE		 998batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
999 struct batadv_tt_global_entry *tt_global_entry,
1000 struct batadv_orig_node *orig_node,
a513088d 1001 const char *message)
db08e6e5
SW		 1002{
1003 struct hlist_head *head;
1004 struct hlist_node *node, *safe;
56303d34 1005 struct batadv_tt_orig_list_entry *orig_entry;
db08e6e5
SW		 1006
1007 spin_lock_bh(&tt_global_entry->list_lock);
1008 head = &tt_global_entry->orig_list;
1009 hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
1010 if (orig_entry->orig_node == orig_node) {
39c75a51 1011 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 1012 "Deleting %pM from global tt entry %pM: %s\n",
1013 orig_node->orig,
1014 tt_global_entry->common.addr, message);
db08e6e5 1015 hlist_del_rcu(node);
a513088d 1016 batadv_tt_orig_list_entry_free_ref(orig_entry);
db08e6e5
SW		 1017 }
1018 }
1019 spin_unlock_bh(&tt_global_entry->list_lock);
1020}
1021
db08e6e5 1022/* If the client is to be deleted, we check if it is the last origantor entry
acd34afa
SE		 1023 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1024 * timer, otherwise we simply remove the originator scheduled for deletion.
db08e6e5 1025 */
a513088d 1026static void
56303d34
SE		 1027batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1028 struct batadv_tt_global_entry *tt_global_entry,
1029 struct batadv_orig_node *orig_node,
1030 const char *message)
db08e6e5
SW		 1031{
1032 bool last_entry = true;
1033 struct hlist_head *head;
1034 struct hlist_node *node;
56303d34 1035 struct batadv_tt_orig_list_entry *orig_entry;
db08e6e5
SW		 1036
1037 /* no local entry exists, case 1:
1038 * Check if this is the last one or if other entries exist.
1039 */
1040
1041 rcu_read_lock();
1042 head = &tt_global_entry->orig_list;
1043 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
1044 if (orig_entry->orig_node != orig_node) {
1045 last_entry = false;
1046 break;
1047 }
1048 }
1049 rcu_read_unlock();
1050
1051 if (last_entry) {
1052 /* its the last one, mark for roaming. */
acd34afa 1053 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
db08e6e5
SW		 1054 tt_global_entry->roam_at = jiffies;
1055 } else
1056 /* there is another entry, we can simply delete this
1057 * one and can still use the other one.
1058 */
a513088d
SE		 1059 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1060 orig_node, message);
db08e6e5
SW		 1061}
1062
1063
1064
56303d34
SE		 1065static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1066 struct batadv_orig_node *orig_node,
a513088d
SE		 1067 const unsigned char *addr,
1068 const char *message, bool roaming)
a73105b8 1069{
56303d34
SE		 1070 struct batadv_tt_global_entry *tt_global_entry = NULL;
1071 struct batadv_tt_local_entry *local_entry = NULL;
a73105b8 1072
a513088d 1073 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
db08e6e5 1074 if (!tt_global_entry)
7683fdc1 1075 goto out;
a73105b8 1076
db08e6e5 1077 if (!roaming) {
a513088d
SE		 1078 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1079 orig_node, message);
db08e6e5
SW		 1080
1081 if (hlist_empty(&tt_global_entry->orig_list))
be73b488
AQ		 1082 batadv_tt_global_free(bat_priv, tt_global_entry,
1083 message);
db08e6e5
SW		 1084
1085 goto out;
1086 }
92f90f56
SE		 1087
1088 /* if we are deleting a global entry due to a roam
1089 * event, there are two possibilities:
db08e6e5
SW		 1090 * 1) the client roamed from node A to node B => if there
1091 * is only one originator left for this client, we mark
acd34afa 1092 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
92f90f56
SE		 1093 * wait for node B to claim it. In case of timeout
1094 * the entry is purged.
db08e6e5
SW		 1095 *
1096 * If there are other originators left, we directly delete
1097 * the originator.
92f90f56 1098 * 2) the client roamed to us => we can directly delete
9cfc7bd6
SE		 1099 * the global entry, since it is useless now.
1100 */
a513088d
SE		 1101 local_entry = batadv_tt_local_hash_find(bat_priv,
1102 tt_global_entry->common.addr);
1103 if (local_entry) {
db08e6e5 1104 /* local entry exists, case 2: client roamed to us. */
a513088d 1105 batadv_tt_global_del_orig_list(tt_global_entry);
be73b488 1106 batadv_tt_global_free(bat_priv, tt_global_entry, message);
db08e6e5
SW		 1107 } else
1108 /* no local entry exists, case 1: check for roaming */
a513088d
SE		 1109 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1110 orig_node, message);
92f90f56 1111
92f90f56 1112
cc47f66e 1113out:
7683fdc1 1114 if (tt_global_entry)
a513088d
SE		 1115 batadv_tt_global_entry_free_ref(tt_global_entry);
1116 if (local_entry)
1117 batadv_tt_local_entry_free_ref(local_entry);
a73105b8
AQ		 1118}
1119
56303d34
SE		 1120void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1121 struct batadv_orig_node *orig_node,
1122 const char *message)
c6c8fea2 1123{
56303d34
SE		 1124 struct batadv_tt_global_entry *tt_global;
1125 struct batadv_tt_common_entry *tt_common_entry;
c90681b8 1126 uint32_t i;
807736f6 1127 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
a73105b8
AQ		 1128 struct hlist_node *node, *safe;
1129 struct hlist_head *head;
7683fdc1 1130 spinlock_t *list_lock; /* protects write access to the hash lists */
c6c8fea2 1131
6e801494
SW		 1132 if (!hash)
1133 return;
1134
a73105b8
AQ		 1135 for (i = 0; i < hash->size; i++) {
1136 head = &hash->table[i];
7683fdc1 1137 list_lock = &hash->list_locks[i];
c6c8fea2 1138
7683fdc1 1139 spin_lock_bh(list_lock);
48100bac 1140 hlist_for_each_entry_safe(tt_common_entry, node, safe,
7c64fd98 1141 head, hash_entry) {
56303d34
SE		 1142 tt_global = container_of(tt_common_entry,
1143 struct batadv_tt_global_entry,
1144 common);
db08e6e5 1145
56303d34 1146 batadv_tt_global_del_orig_entry(bat_priv, tt_global,
a513088d 1147 orig_node, message);
db08e6e5 1148
56303d34 1149 if (hlist_empty(&tt_global->orig_list)) {
39c75a51 1150 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf 1151 "Deleting global tt entry %pM: %s\n",
56303d34 1152 tt_global->common.addr, message);
7683fdc1 1153 hlist_del_rcu(node);
56303d34 1154 batadv_tt_global_entry_free_ref(tt_global);
7683fdc1 1155 }
a73105b8 1156 }
7683fdc1 1157 spin_unlock_bh(list_lock);
c6c8fea2 1158 }
17071578 1159 orig_node->tt_initialised = false;
c6c8fea2
SE		 1160}
1161
30cfd02b
AQ		 1162static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1163 char **msg)
cc47f66e 1164{
30cfd02b
AQ		 1165 bool purge = false;
1166 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1167 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
42d0b044 1168
30cfd02b
AQ		 1169 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1170 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1171 purge = true;
1172 *msg = "Roaming timeout\n";
1173 }
42d0b044 1174
30cfd02b
AQ		 1175 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1176 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1177 purge = true;
1178 *msg = "Temporary client timeout\n";
42d0b044 1179 }
30cfd02b
AQ		 1180
1181 return purge;
42d0b044
SE		 1182}
1183
30cfd02b 1184static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
42d0b044 1185{
807736f6 1186 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
cc47f66e 1187 struct hlist_head *head;
30cfd02b 1188 struct hlist_node *node, *node_tmp;
7683fdc1 1189 spinlock_t *list_lock; /* protects write access to the hash lists */
c90681b8 1190 uint32_t i;
30cfd02b
AQ		 1191 char *msg = NULL;
1192 struct batadv_tt_common_entry *tt_common;
1193 struct batadv_tt_global_entry *tt_global;
cc47f66e 1194
cc47f66e
AQ		 1195 for (i = 0; i < hash->size; i++) {
1196 head = &hash->table[i];
7683fdc1 1197 list_lock = &hash->list_locks[i];
cc47f66e 1198
7683fdc1 1199 spin_lock_bh(list_lock);
30cfd02b
AQ		 1200 hlist_for_each_entry_safe(tt_common, node, node_tmp, head,
1201 hash_entry) {
1202 tt_global = container_of(tt_common,
1203 struct batadv_tt_global_entry,
1204 common);
1205
1206 if (!batadv_tt_global_to_purge(tt_global, &msg))
1207 continue;
1208
1209 batadv_dbg(BATADV_DBG_TT, bat_priv,
1210 "Deleting global tt entry (%pM): %s\n",
1211 tt_global->common.addr, msg);
1212
1213 hlist_del_rcu(node);
1214
1215 batadv_tt_global_entry_free_ref(tt_global);
1216 }
7683fdc1 1217 spin_unlock_bh(list_lock);
cc47f66e 1218 }
cc47f66e
AQ		 1219}
1220
56303d34 1221static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
c6c8fea2 1222{
5bf74e9c 1223 struct batadv_hashtable *hash;
7683fdc1 1224 spinlock_t *list_lock; /* protects write access to the hash lists */
56303d34
SE		 1225 struct batadv_tt_common_entry *tt_common_entry;
1226 struct batadv_tt_global_entry *tt_global;
7683fdc1
AQ		 1227 struct hlist_node *node, *node_tmp;
1228 struct hlist_head *head;
c90681b8 1229 uint32_t i;
7683fdc1 1230
807736f6 1231 if (!bat_priv->tt.global_hash)
c6c8fea2
SE		 1232 return;
1233
807736f6 1234 hash = bat_priv->tt.global_hash;
7683fdc1
AQ		 1235
1236 for (i = 0; i < hash->size; i++) {
1237 head = &hash->table[i];
1238 list_lock = &hash->list_locks[i];
1239
1240 spin_lock_bh(list_lock);
48100bac 1241 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
7683fdc1
AQ		 1242 head, hash_entry) {
1243 hlist_del_rcu(node);
56303d34
SE		 1244 tt_global = container_of(tt_common_entry,
1245 struct batadv_tt_global_entry,
1246 common);
1247 batadv_tt_global_entry_free_ref(tt_global);
7683fdc1
AQ		 1248 }
1249 spin_unlock_bh(list_lock);
1250 }
1251
1a8eaf07 1252 batadv_hash_destroy(hash);
7683fdc1 1253
807736f6 1254 bat_priv->tt.global_hash = NULL;
c6c8fea2
SE		 1255}
1256
56303d34
SE		 1257static bool
1258_batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1259 struct batadv_tt_global_entry *tt_global_entry)
59b699cd
AQ		 1260{
1261 bool ret = false;
1262
acd34afa
SE		 1263 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1264 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
59b699cd
AQ		 1265 ret = true;
1266
1267 return ret;
1268}
1269
56303d34
SE		 1270struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1271 const uint8_t *src,
1272 const uint8_t *addr)
c6c8fea2 1273{
56303d34
SE		 1274 struct batadv_tt_local_entry *tt_local_entry = NULL;
1275 struct batadv_tt_global_entry *tt_global_entry = NULL;
1276 struct batadv_orig_node *orig_node = NULL;
1277 struct batadv_neigh_node *router = NULL;
db08e6e5
SW		 1278 struct hlist_head *head;
1279 struct hlist_node *node;
56303d34 1280 struct batadv_tt_orig_list_entry *orig_entry;
db08e6e5 1281 int best_tq;
c6c8fea2 1282
3d393e47 1283 if (src && atomic_read(&bat_priv->ap_isolation)) {
a513088d 1284 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src);
068ee6e2
AQ		 1285 if (!tt_local_entry ||
1286 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
3d393e47
AQ		 1287 goto out;
1288 }
7aadf889 1289
a513088d 1290 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
2dafb49d 1291 if (!tt_global_entry)
7b36e8ee 1292 goto out;
7aadf889 1293
3d393e47 1294 /* check whether the clients should not communicate due to AP
9cfc7bd6
SE		 1295 * isolation
1296 */
a513088d
SE		 1297 if (tt_local_entry &&
1298 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3d393e47
AQ		 1299 goto out;
1300
db08e6e5 1301 best_tq = 0;
c6c8fea2 1302
db08e6e5
SW		 1303 rcu_read_lock();
1304 head = &tt_global_entry->orig_list;
1305 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
7d211efc 1306 router = batadv_orig_node_get_router(orig_entry->orig_node);
db08e6e5
SW		 1307 if (!router)
1308 continue;
c6c8fea2 1309
db08e6e5
SW		 1310 if (router->tq_avg > best_tq) {
1311 orig_node = orig_entry->orig_node;
1312 best_tq = router->tq_avg;
1313 }
7d211efc 1314 batadv_neigh_node_free_ref(router);
db08e6e5
SW		 1315 }
1316 /* found anything? */
1317 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1318 orig_node = NULL;
1319 rcu_read_unlock();
7b36e8ee 1320out:
3d393e47 1321 if (tt_global_entry)
a513088d 1322 batadv_tt_global_entry_free_ref(tt_global_entry);
3d393e47 1323 if (tt_local_entry)
a513088d 1324 batadv_tt_local_entry_free_ref(tt_local_entry);
3d393e47 1325
7b36e8ee 1326 return orig_node;
c6c8fea2 1327}
a73105b8
AQ		 1328
1329/* Calculates the checksum of the local table of a given orig_node */
56303d34
SE		 1330static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1331 struct batadv_orig_node *orig_node)
a73105b8
AQ		 1332{
1333 uint16_t total = 0, total_one;
807736f6 1334 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
56303d34
SE		 1335 struct batadv_tt_common_entry *tt_common;
1336 struct batadv_tt_global_entry *tt_global;
a73105b8
AQ		 1337 struct hlist_node *node;
1338 struct hlist_head *head;
c90681b8
AQ		 1339 uint32_t i;
1340 int j;
a73105b8
AQ		 1341
1342 for (i = 0; i < hash->size; i++) {
1343 head = &hash->table[i];
1344
1345 rcu_read_lock();
acd34afa 1346 hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) {
56303d34
SE		 1347 tt_global = container_of(tt_common,
1348 struct batadv_tt_global_entry,
1349 common);
db08e6e5
SW		 1350 /* Roaming clients are in the global table for
1351 * consistency only. They don't have to be
1352 * taken into account while computing the
1353 * global crc
1354 */
acd34afa 1355 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
db08e6e5 1356 continue;
30cfd02b
AQ		 1357 /* Temporary clients have not been announced yet, so
1358 * they have to be skipped while computing the global
1359 * crc
1360 */
1361 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
1362 continue;
db08e6e5
SW		 1363
1364 /* find out if this global entry is announced by this
1365 * originator
1366 */
56303d34 1367 if (!batadv_tt_global_entry_has_orig(tt_global,
a513088d 1368 orig_node))
db08e6e5
SW		 1369 continue;
1370
1371 total_one = 0;
1372 for (j = 0; j < ETH_ALEN; j++)
1373 total_one = crc16_byte(total_one,
acd34afa 1374 tt_common->addr[j]);
db08e6e5 1375 total ^= total_one;
a73105b8
AQ		 1376 }
1377 rcu_read_unlock();
1378 }
1379
1380 return total;
1381}
1382
1383/* Calculates the checksum of the local table */
56303d34 1384static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv)
a73105b8
AQ		 1385{
1386 uint16_t total = 0, total_one;
807736f6 1387 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
56303d34 1388 struct batadv_tt_common_entry *tt_common;
a73105b8
AQ		 1389 struct hlist_node *node;
1390 struct hlist_head *head;
c90681b8
AQ		 1391 uint32_t i;
1392 int j;
a73105b8
AQ		 1393
1394 for (i = 0; i < hash->size; i++) {
1395 head = &hash->table[i];
1396
1397 rcu_read_lock();
acd34afa 1398 hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) {
058d0e26 1399 /* not yet committed clients have not to be taken into
9cfc7bd6
SE		 1400 * account while computing the CRC
1401 */
acd34afa 1402 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
058d0e26 1403 continue;
a73105b8
AQ		 1404 total_one = 0;
1405 for (j = 0; j < ETH_ALEN; j++)
1406 total_one = crc16_byte(total_one,
acd34afa 1407 tt_common->addr[j]);
a73105b8
AQ		 1408 total ^= total_one;
1409 }
a73105b8
AQ		 1410 rcu_read_unlock();
1411 }
1412
1413 return total;
1414}
1415
56303d34 1416static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
a73105b8 1417{
56303d34 1418 struct batadv_tt_req_node *node, *safe;
a73105b8 1419
807736f6 1420 spin_lock_bh(&bat_priv->tt.req_list_lock);
a73105b8 1421
807736f6 1422 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
a73105b8
AQ		 1423 list_del(&node->list);
1424 kfree(node);
1425 }
1426
807736f6 1427 spin_unlock_bh(&bat_priv->tt.req_list_lock);
a73105b8
AQ		 1428}
1429
56303d34
SE		 1430static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
1431 struct batadv_orig_node *orig_node,
a513088d
SE		 1432 const unsigned char *tt_buff,
1433 uint8_t tt_num_changes)
a73105b8 1434{
08c36d3e 1435 uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
a73105b8
AQ		 1436
1437 /* Replace the old buffer only if I received something in the
9cfc7bd6
SE		 1438 * last OGM (the OGM could carry no changes)
1439 */
a73105b8
AQ		 1440 spin_lock_bh(&orig_node->tt_buff_lock);
1441 if (tt_buff_len > 0) {
1442 kfree(orig_node->tt_buff);
1443 orig_node->tt_buff_len = 0;
1444 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
1445 if (orig_node->tt_buff) {
1446 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
1447 orig_node->tt_buff_len = tt_buff_len;
1448 }
1449 }
1450 spin_unlock_bh(&orig_node->tt_buff_lock);
1451}
1452
56303d34 1453static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
a73105b8 1454{
56303d34 1455 struct batadv_tt_req_node *node, *safe;
a73105b8 1456
807736f6
SE		 1457 spin_lock_bh(&bat_priv->tt.req_list_lock);
1458 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
42d0b044
SE		 1459 if (batadv_has_timed_out(node->issued_at,
1460 BATADV_TT_REQUEST_TIMEOUT)) {
a73105b8
AQ		 1461 list_del(&node->list);
1462 kfree(node);
1463 }
1464 }
807736f6 1465 spin_unlock_bh(&bat_priv->tt.req_list_lock);
a73105b8
AQ		 1466}
1467
1468/* returns the pointer to the new tt_req_node struct if no request
9cfc7bd6
SE		 1469 * has already been issued for this orig_node, NULL otherwise
1470 */
56303d34
SE		 1471static struct batadv_tt_req_node *
1472batadv_new_tt_req_node(struct batadv_priv *bat_priv,
1473 struct batadv_orig_node *orig_node)
a73105b8 1474{
56303d34 1475 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
a73105b8 1476
807736f6
SE		 1477 spin_lock_bh(&bat_priv->tt.req_list_lock);
1478 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
1eda58bf
SE		 1479 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
1480 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
42d0b044 1481 BATADV_TT_REQUEST_TIMEOUT))
a73105b8
AQ		 1482 goto unlock;
1483 }
1484
1485 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1486 if (!tt_req_node)
1487 goto unlock;
1488
1489 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1490 tt_req_node->issued_at = jiffies;
1491
807736f6 1492 list_add(&tt_req_node->list, &bat_priv->tt.req_list);
a73105b8 1493unlock:
807736f6 1494 spin_unlock_bh(&bat_priv->tt.req_list_lock);
a73105b8
AQ		 1495 return tt_req_node;
1496}
1497
058d0e26 1498/* data_ptr is useless here, but has to be kept to respect the prototype */
a513088d
SE		 1499static int batadv_tt_local_valid_entry(const void *entry_ptr,
1500 const void *data_ptr)
058d0e26 1501{
56303d34 1502 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
058d0e26 1503
acd34afa 1504 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
058d0e26
AQ		 1505 return 0;
1506 return 1;
1507}
1508
a513088d
SE		 1509static int batadv_tt_global_valid(const void *entry_ptr,
1510 const void *data_ptr)
a73105b8 1511{
56303d34
SE		 1512 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
1513 const struct batadv_tt_global_entry *tt_global_entry;
1514 const struct batadv_orig_node *orig_node = data_ptr;
a73105b8 1515
30cfd02b
AQ		 1516 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
1517 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
cc47f66e
AQ		 1518 return 0;
1519
56303d34
SE		 1520 tt_global_entry = container_of(tt_common_entry,
1521 struct batadv_tt_global_entry,
48100bac
AQ		 1522 common);
1523
a513088d 1524 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
a73105b8
AQ		 1525}
1526
a513088d
SE		 1527static struct sk_buff *
1528batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
5bf74e9c 1529 struct batadv_hashtable *hash,
56303d34 1530 struct batadv_hard_iface *primary_if,
a513088d
SE		 1531 int (*valid_cb)(const void *, const void *),
1532 void *cb_data)
a73105b8 1533{
56303d34 1534 struct batadv_tt_common_entry *tt_common_entry;
96412690
SE		 1535 struct batadv_tt_query_packet *tt_response;
1536 struct batadv_tt_change *tt_change;
a73105b8
AQ		 1537 struct hlist_node *node;
1538 struct hlist_head *head;
1539 struct sk_buff *skb = NULL;
1540 uint16_t tt_tot, tt_count;
96412690 1541 ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet);
c90681b8 1542 uint32_t i;
96412690 1543 size_t len;
a73105b8
AQ		 1544
1545 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1546 tt_len = primary_if->soft_iface->mtu - tt_query_size;
96412690 1547 tt_len -= tt_len % sizeof(struct batadv_tt_change);
a73105b8 1548 }
96412690 1549 tt_tot = tt_len / sizeof(struct batadv_tt_change);
a73105b8 1550
96412690 1551 len = tt_query_size + tt_len;
5b246574 1552 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN);
a73105b8
AQ		 1553 if (!skb)
1554 goto out;
1555
5b246574 1556 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
96412690 1557 tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len);
a73105b8 1558 tt_response->ttvn = ttvn;
a73105b8 1559
96412690 1560 tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size);
a73105b8
AQ		 1561 tt_count = 0;
1562
1563 rcu_read_lock();
1564 for (i = 0; i < hash->size; i++) {
1565 head = &hash->table[i];
1566
48100bac 1567 hlist_for_each_entry_rcu(tt_common_entry, node,
a73105b8
AQ		 1568 head, hash_entry) {
1569 if (tt_count == tt_tot)
1570 break;
1571
48100bac 1572 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
a73105b8
AQ		 1573 continue;
1574
48100bac
AQ		 1575 memcpy(tt_change->addr, tt_common_entry->addr,
1576 ETH_ALEN);
42d0b044 1577 tt_change->flags = BATADV_NO_FLAGS;
a73105b8
AQ		 1578
1579 tt_count++;
1580 tt_change++;
1581 }
1582 }
1583 rcu_read_unlock();
1584
9d852393 1585 /* store in the message the number of entries we have successfully
9cfc7bd6
SE		 1586 * copied
1587 */
9d852393
AQ		 1588 tt_response->tt_data = htons(tt_count);
1589
a73105b8
AQ		 1590out:
1591 return skb;
1592}
1593
56303d34
SE		 1594static int batadv_send_tt_request(struct batadv_priv *bat_priv,
1595 struct batadv_orig_node *dst_orig_node,
a513088d
SE		 1596 uint8_t ttvn, uint16_t tt_crc,
1597 bool full_table)
a73105b8
AQ		 1598{
1599 struct sk_buff *skb = NULL;
96412690 1600 struct batadv_tt_query_packet *tt_request;
56303d34
SE		 1601 struct batadv_neigh_node *neigh_node = NULL;
1602 struct batadv_hard_iface *primary_if;
1603 struct batadv_tt_req_node *tt_req_node = NULL;
a73105b8 1604 int ret = 1;
96412690 1605 size_t tt_req_len;
a73105b8 1606
e5d89254 1607 primary_if = batadv_primary_if_get_selected(bat_priv);
a73105b8
AQ		 1608 if (!primary_if)
1609 goto out;
1610
1611 /* The new tt_req will be issued only if I'm not waiting for a
9cfc7bd6
SE		 1612 * reply from the same orig_node yet
1613 */
a513088d 1614 tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
a73105b8
AQ		 1615 if (!tt_req_node)
1616 goto out;
1617
5b246574 1618 skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN + NET_IP_ALIGN);
a73105b8
AQ		 1619 if (!skb)
1620 goto out;
1621
5b246574 1622 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
a73105b8 1623
96412690
SE		 1624 tt_req_len = sizeof(*tt_request);
1625 tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len);
a73105b8 1626
acd34afa 1627 tt_request->header.packet_type = BATADV_TT_QUERY;
7e071c79 1628 tt_request->header.version = BATADV_COMPAT_VERSION;
a73105b8
AQ		 1629 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1630 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
42d0b044 1631 tt_request->header.ttl = BATADV_TTL;
a73105b8 1632 tt_request->ttvn = ttvn;
6d2003fc 1633 tt_request->tt_data = htons(tt_crc);
acd34afa 1634 tt_request->flags = BATADV_TT_REQUEST;
a73105b8
AQ		 1635
1636 if (full_table)
acd34afa 1637 tt_request->flags |= BATADV_TT_FULL_TABLE;
a73105b8 1638
7d211efc 1639 neigh_node = batadv_orig_node_get_router(dst_orig_node);
a73105b8
AQ		 1640 if (!neigh_node)
1641 goto out;
1642
39c75a51 1643 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 1644 "Sending TT_REQUEST to %pM via %pM [%c]\n",
1645 dst_orig_node->orig, neigh_node->addr,
1646 (full_table ? 'F' : '.'));
a73105b8 1647
d69909d2 1648 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
f8214865 1649
9455e34c 1650 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
a73105b8
AQ		 1651 ret = 0;
1652
1653out:
1654 if (neigh_node)
7d211efc 1655 batadv_neigh_node_free_ref(neigh_node);
a73105b8 1656 if (primary_if)
e5d89254 1657 batadv_hardif_free_ref(primary_if);
a73105b8
AQ		 1658 if (ret)
1659 kfree_skb(skb);
1660 if (ret && tt_req_node) {
807736f6 1661 spin_lock_bh(&bat_priv->tt.req_list_lock);
a73105b8 1662 list_del(&tt_req_node->list);
807736f6 1663 spin_unlock_bh(&bat_priv->tt.req_list_lock);
a73105b8
AQ		 1664 kfree(tt_req_node);
1665 }
1666 return ret;
1667}
1668
96412690 1669static bool
56303d34 1670batadv_send_other_tt_response(struct batadv_priv *bat_priv,
96412690 1671 struct batadv_tt_query_packet *tt_request)
a73105b8 1672{
56303d34
SE		 1673 struct batadv_orig_node *req_dst_orig_node = NULL;
1674 struct batadv_orig_node *res_dst_orig_node = NULL;
1675 struct batadv_neigh_node *neigh_node = NULL;
1676 struct batadv_hard_iface *primary_if = NULL;
a73105b8
AQ		 1677 uint8_t orig_ttvn, req_ttvn, ttvn;
1678 int ret = false;
1679 unsigned char *tt_buff;
1680 bool full_table;
1681 uint16_t tt_len, tt_tot;
1682 struct sk_buff *skb = NULL;
96412690 1683 struct batadv_tt_query_packet *tt_response;
c67893d1 1684 uint8_t *packet_pos;
96412690 1685 size_t len;
a73105b8 1686
39c75a51 1687 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 1688 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1689 tt_request->src, tt_request->ttvn, tt_request->dst,
acd34afa 1690 (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
a73105b8
AQ		 1691
1692 /* Let's get the orig node of the REAL destination */
da641193 1693 req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst);
a73105b8
AQ		 1694 if (!req_dst_orig_node)
1695 goto out;
1696
da641193 1697 res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
a73105b8
AQ		 1698 if (!res_dst_orig_node)
1699 goto out;
1700
7d211efc 1701 neigh_node = batadv_orig_node_get_router(res_dst_orig_node);
a73105b8
AQ		 1702 if (!neigh_node)
1703 goto out;
1704
e5d89254 1705 primary_if = batadv_primary_if_get_selected(bat_priv);
a73105b8
AQ		 1706 if (!primary_if)
1707 goto out;
1708
1709 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1710 req_ttvn = tt_request->ttvn;
1711
015758d0 1712 /* I don't have the requested data */
a73105b8 1713 if (orig_ttvn != req_ttvn ||
f25bd58a 1714 tt_request->tt_data != htons(req_dst_orig_node->tt_crc))
a73105b8
AQ		 1715 goto out;
1716
015758d0 1717 /* If the full table has been explicitly requested */
acd34afa 1718 if (tt_request->flags & BATADV_TT_FULL_TABLE ||
a73105b8
AQ		 1719 !req_dst_orig_node->tt_buff)
1720 full_table = true;
1721 else
1722 full_table = false;
1723
1724 /* In this version, fragmentation is not implemented, then
9cfc7bd6
SE		 1725 * I'll send only one packet with as much TT entries as I can
1726 */
a73105b8
AQ		 1727 if (!full_table) {
1728 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1729 tt_len = req_dst_orig_node->tt_buff_len;
96412690 1730 tt_tot = tt_len / sizeof(struct batadv_tt_change);
a73105b8 1731
96412690 1732 len = sizeof(*tt_response) + tt_len;
5b246574 1733 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN);
a73105b8
AQ		 1734 if (!skb)
1735 goto unlock;
1736
5b246574 1737 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
c67893d1
SE		 1738 packet_pos = skb_put(skb, len);
1739 tt_response = (struct batadv_tt_query_packet *)packet_pos;
a73105b8
AQ		 1740 tt_response->ttvn = req_ttvn;
1741 tt_response->tt_data = htons(tt_tot);
1742
96412690 1743 tt_buff = skb->data + sizeof(*tt_response);
a73105b8
AQ		 1744 /* Copy the last orig_node's OGM buffer */
1745 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1746 req_dst_orig_node->tt_buff_len);
1747
1748 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1749 } else {
96412690
SE		 1750 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size);
1751 tt_len *= sizeof(struct batadv_tt_change);
a73105b8
AQ		 1752 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1753
a513088d 1754 skb = batadv_tt_response_fill_table(tt_len, ttvn,
807736f6 1755 bat_priv->tt.global_hash,
a513088d
SE		 1756 primary_if,
1757 batadv_tt_global_valid,
1758 req_dst_orig_node);
a73105b8
AQ		 1759 if (!skb)
1760 goto out;
1761
96412690 1762 tt_response = (struct batadv_tt_query_packet *)skb->data;
a73105b8
AQ		 1763 }
1764
acd34afa 1765 tt_response->header.packet_type = BATADV_TT_QUERY;
7e071c79 1766 tt_response->header.version = BATADV_COMPAT_VERSION;
42d0b044 1767 tt_response->header.ttl = BATADV_TTL;
a73105b8
AQ		 1768 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1769 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
acd34afa 1770 tt_response->flags = BATADV_TT_RESPONSE;
a73105b8
AQ		 1771
1772 if (full_table)
acd34afa 1773 tt_response->flags |= BATADV_TT_FULL_TABLE;
a73105b8 1774
39c75a51 1775 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 1776 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1777 res_dst_orig_node->orig, neigh_node->addr,
1778 req_dst_orig_node->orig, req_ttvn);
a73105b8 1779
d69909d2 1780 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
f8214865 1781
9455e34c 1782 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
a73105b8
AQ		 1783 ret = true;
1784 goto out;
1785
1786unlock:
1787 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1788
1789out:
1790 if (res_dst_orig_node)
7d211efc 1791 batadv_orig_node_free_ref(res_dst_orig_node);
a73105b8 1792 if (req_dst_orig_node)
7d211efc 1793 batadv_orig_node_free_ref(req_dst_orig_node);
a73105b8 1794 if (neigh_node)
7d211efc 1795 batadv_neigh_node_free_ref(neigh_node);
a73105b8 1796 if (primary_if)
e5d89254 1797 batadv_hardif_free_ref(primary_if);
a73105b8
AQ		 1798 if (!ret)
1799 kfree_skb(skb);
1800 return ret;
1801
1802}
96412690
SE		 1803
1804static bool
56303d34 1805batadv_send_my_tt_response(struct batadv_priv *bat_priv,
96412690 1806 struct batadv_tt_query_packet *tt_request)
a73105b8 1807{
56303d34
SE		 1808 struct batadv_orig_node *orig_node = NULL;
1809 struct batadv_neigh_node *neigh_node = NULL;
1810 struct batadv_hard_iface *primary_if = NULL;
a73105b8
AQ		 1811 uint8_t my_ttvn, req_ttvn, ttvn;
1812 int ret = false;
1813 unsigned char *tt_buff;
1814 bool full_table;
1815 uint16_t tt_len, tt_tot;
1816 struct sk_buff *skb = NULL;
96412690 1817 struct batadv_tt_query_packet *tt_response;
c67893d1 1818 uint8_t *packet_pos;
96412690 1819 size_t len;
a73105b8 1820
39c75a51 1821 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 1822 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1823 tt_request->src, tt_request->ttvn,
acd34afa 1824 (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
a73105b8
AQ		 1825
1826
807736f6 1827 my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
a73105b8
AQ		 1828 req_ttvn = tt_request->ttvn;
1829
da641193 1830 orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
a73105b8
AQ		 1831 if (!orig_node)
1832 goto out;
1833
7d211efc 1834 neigh_node = batadv_orig_node_get_router(orig_node);
a73105b8
AQ		 1835 if (!neigh_node)
1836 goto out;
1837
e5d89254 1838 primary_if = batadv_primary_if_get_selected(bat_priv);
a73105b8
AQ		 1839 if (!primary_if)
1840 goto out;
1841
1842 /* If the full table has been explicitly requested or the gap
9cfc7bd6
SE		 1843 * is too big send the whole local translation table
1844 */
acd34afa 1845 if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
807736f6 1846 !bat_priv->tt.last_changeset)
a73105b8
AQ		 1847 full_table = true;
1848 else
1849 full_table = false;
1850
1851 /* In this version, fragmentation is not implemented, then
9cfc7bd6
SE		 1852 * I'll send only one packet with as much TT entries as I can
1853 */
a73105b8 1854 if (!full_table) {
807736f6
SE		 1855 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1856 tt_len = bat_priv->tt.last_changeset_len;
96412690 1857 tt_tot = tt_len / sizeof(struct batadv_tt_change);
a73105b8 1858
96412690 1859 len = sizeof(*tt_response) + tt_len;
5b246574 1860 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN);
a73105b8
AQ		 1861 if (!skb)
1862 goto unlock;
1863
5b246574 1864 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
c67893d1
SE		 1865 packet_pos = skb_put(skb, len);
1866 tt_response = (struct batadv_tt_query_packet *)packet_pos;
a73105b8
AQ		 1867 tt_response->ttvn = req_ttvn;
1868 tt_response->tt_data = htons(tt_tot);
1869
96412690 1870 tt_buff = skb->data + sizeof(*tt_response);
807736f6
SE		 1871 memcpy(tt_buff, bat_priv->tt.last_changeset,
1872 bat_priv->tt.last_changeset_len);
1873 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
a73105b8 1874 } else {
807736f6 1875 tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num);
96412690 1876 tt_len *= sizeof(struct batadv_tt_change);
807736f6 1877 ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
a73105b8 1878
a513088d 1879 skb = batadv_tt_response_fill_table(tt_len, ttvn,
807736f6 1880 bat_priv->tt.local_hash,
a513088d
SE		 1881 primary_if,
1882 batadv_tt_local_valid_entry,
1883 NULL);
a73105b8
AQ		 1884 if (!skb)
1885 goto out;
1886
96412690 1887 tt_response = (struct batadv_tt_query_packet *)skb->data;
a73105b8
AQ		 1888 }
1889
acd34afa 1890 tt_response->header.packet_type = BATADV_TT_QUERY;
7e071c79 1891 tt_response->header.version = BATADV_COMPAT_VERSION;
42d0b044 1892 tt_response->header.ttl = BATADV_TTL;
a73105b8
AQ		 1893 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1894 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
acd34afa 1895 tt_response->flags = BATADV_TT_RESPONSE;
a73105b8
AQ		 1896
1897 if (full_table)
acd34afa 1898 tt_response->flags |= BATADV_TT_FULL_TABLE;
a73105b8 1899
39c75a51 1900 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 1901 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1902 orig_node->orig, neigh_node->addr,
acd34afa 1903 (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
a73105b8 1904
d69909d2 1905 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
f8214865 1906
9455e34c 1907 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
a73105b8
AQ		 1908 ret = true;
1909 goto out;
1910
1911unlock:
807736f6 1912 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
a73105b8
AQ		 1913out:
1914 if (orig_node)
7d211efc 1915 batadv_orig_node_free_ref(orig_node);
a73105b8 1916 if (neigh_node)
7d211efc 1917 batadv_neigh_node_free_ref(neigh_node);
a73105b8 1918 if (primary_if)
e5d89254 1919 batadv_hardif_free_ref(primary_if);
a73105b8
AQ		 1920 if (!ret)
1921 kfree_skb(skb);
1922 /* This packet was for me, so it doesn't need to be re-routed */
1923 return true;
1924}
1925
56303d34 1926bool batadv_send_tt_response(struct batadv_priv *bat_priv,
96412690 1927 struct batadv_tt_query_packet *tt_request)
a73105b8 1928{
3193e8fd 1929 if (batadv_is_my_mac(tt_request->dst)) {
20ff9d59 1930 /* don't answer backbone gws! */
08adf151 1931 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src))
20ff9d59
SW		 1932 return true;
1933
a513088d 1934 return batadv_send_my_tt_response(bat_priv, tt_request);
20ff9d59 1935 } else {
a513088d 1936 return batadv_send_other_tt_response(bat_priv, tt_request);
20ff9d59 1937 }
a73105b8
AQ		 1938}
1939
56303d34
SE		 1940static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
1941 struct batadv_orig_node *orig_node,
96412690 1942 struct batadv_tt_change *tt_change,
a513088d 1943 uint16_t tt_num_changes, uint8_t ttvn)
a73105b8
AQ		 1944{
1945 int i;
a513088d 1946 int roams;
a73105b8
AQ		 1947
1948 for (i = 0; i < tt_num_changes; i++) {
acd34afa
SE		 1949 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
1950 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
a513088d
SE		 1951 batadv_tt_global_del(bat_priv, orig_node,
1952 (tt_change + i)->addr,
d4f44692
AQ		 1953 "tt removed by changes",
1954 roams);
08c36d3e 1955 } else {
08c36d3e 1956 if (!batadv_tt_global_add(bat_priv, orig_node,
d4f44692
AQ		 1957 (tt_change + i)->addr,
1958 (tt_change + i)->flags, ttvn))
a73105b8
AQ		 1959 /* In case of problem while storing a
1960 * global_entry, we stop the updating
1961 * procedure without committing the
1962 * ttvn change. This will avoid to send
1963 * corrupted data on tt_request
1964 */
1965 return;
08c36d3e 1966 }
a73105b8 1967 }
17071578 1968 orig_node->tt_initialised = true;
a73105b8
AQ		 1969}
1970
56303d34 1971static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
96412690 1972 struct batadv_tt_query_packet *tt_response)
a73105b8 1973{
56303d34 1974 struct batadv_orig_node *orig_node = NULL;
a73105b8 1975
da641193 1976 orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
a73105b8
AQ		 1977 if (!orig_node)
1978 goto out;
1979
1980 /* Purge the old table first.. */
08c36d3e 1981 batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table");
a73105b8 1982
a513088d 1983 _batadv_tt_update_changes(bat_priv, orig_node,
96412690 1984 (struct batadv_tt_change *)(tt_response + 1),
a513088d
SE		 1985 ntohs(tt_response->tt_data),
1986 tt_response->ttvn);
a73105b8
AQ		 1987
1988 spin_lock_bh(&orig_node->tt_buff_lock);
1989 kfree(orig_node->tt_buff);
1990 orig_node->tt_buff_len = 0;
1991 orig_node->tt_buff = NULL;
1992 spin_unlock_bh(&orig_node->tt_buff_lock);
1993
1994 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1995
1996out:
1997 if (orig_node)
7d211efc 1998 batadv_orig_node_free_ref(orig_node);
a73105b8
AQ		 1999}
2000
56303d34
SE		 2001static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2002 struct batadv_orig_node *orig_node,
a513088d 2003 uint16_t tt_num_changes, uint8_t ttvn,
96412690 2004 struct batadv_tt_change *tt_change)
a73105b8 2005{
a513088d
SE		 2006 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2007 tt_num_changes, ttvn);
a73105b8 2008
a513088d
SE		 2009 batadv_tt_save_orig_buffer(bat_priv, orig_node,
2010 (unsigned char *)tt_change, tt_num_changes);
a73105b8
AQ		 2011 atomic_set(&orig_node->last_ttvn, ttvn);
2012}
2013
56303d34 2014bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr)
a73105b8 2015{
56303d34 2016 struct batadv_tt_local_entry *tt_local_entry = NULL;
7683fdc1 2017 bool ret = false;
a73105b8 2018
a513088d 2019 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
7683fdc1
AQ		 2020 if (!tt_local_entry)
2021 goto out;
058d0e26 2022 /* Check if the client has been logically deleted (but is kept for
9cfc7bd6
SE		 2023 * consistency purpose)
2024 */
7c1fd91d
AQ		 2025 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2026 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
058d0e26 2027 goto out;
7683fdc1
AQ		 2028 ret = true;
2029out:
a73105b8 2030 if (tt_local_entry)
a513088d 2031 batadv_tt_local_entry_free_ref(tt_local_entry);
7683fdc1 2032 return ret;
a73105b8
AQ		 2033}
2034
56303d34 2035void batadv_handle_tt_response(struct batadv_priv *bat_priv,
96412690 2036 struct batadv_tt_query_packet *tt_response)
a73105b8 2037{
56303d34
SE		 2038 struct batadv_tt_req_node *node, *safe;
2039 struct batadv_orig_node *orig_node = NULL;
96412690 2040 struct batadv_tt_change *tt_change;
a73105b8 2041
39c75a51 2042 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 2043 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2044 tt_response->src, tt_response->ttvn,
2045 ntohs(tt_response->tt_data),
acd34afa 2046 (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
a73105b8 2047
20ff9d59 2048 /* we should have never asked a backbone gw */
08adf151 2049 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src))
20ff9d59
SW		 2050 goto out;
2051
da641193 2052 orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
a73105b8
AQ		 2053 if (!orig_node)
2054 goto out;
2055
96412690 2056 if (tt_response->flags & BATADV_TT_FULL_TABLE) {
a513088d 2057 batadv_tt_fill_gtable(bat_priv, tt_response);
96412690
SE		 2058 } else {
2059 tt_change = (struct batadv_tt_change *)(tt_response + 1);
a513088d
SE		 2060 batadv_tt_update_changes(bat_priv, orig_node,
2061 ntohs(tt_response->tt_data),
96412690
SE		 2062 tt_response->ttvn, tt_change);
2063 }
a73105b8
AQ		 2064
2065 /* Delete the tt_req_node from pending tt_requests list */
807736f6
SE		 2066 spin_lock_bh(&bat_priv->tt.req_list_lock);
2067 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1eda58bf 2068 if (!batadv_compare_eth(node->addr, tt_response->src))
a73105b8
AQ		 2069 continue;
2070 list_del(&node->list);
2071 kfree(node);
2072 }
807736f6 2073 spin_unlock_bh(&bat_priv->tt.req_list_lock);
a73105b8
AQ		 2074
2075 /* Recalculate the CRC for this orig_node and store it */
a513088d 2076 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
a73105b8
AQ		 2077out:
2078 if (orig_node)
7d211efc 2079 batadv_orig_node_free_ref(orig_node);
a73105b8
AQ		 2080}
2081
56303d34 2082int batadv_tt_init(struct batadv_priv *bat_priv)
a73105b8 2083{
5346c35e 2084 int ret;
a73105b8 2085
a513088d 2086 ret = batadv_tt_local_init(bat_priv);
5346c35e
SE		 2087 if (ret < 0)
2088 return ret;
2089
a513088d 2090 ret = batadv_tt_global_init(bat_priv);
5346c35e
SE		 2091 if (ret < 0)
2092 return ret;
a73105b8 2093
a513088d 2094 batadv_tt_start_timer(bat_priv);
a73105b8
AQ		 2095
2096 return 1;
2097}
2098
56303d34 2099static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
a73105b8 2100{
56303d34 2101 struct batadv_tt_roam_node *node, *safe;
a73105b8 2102
807736f6 2103 spin_lock_bh(&bat_priv->tt.roam_list_lock);
a73105b8 2104
807736f6 2105 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
cc47f66e
AQ		 2106 list_del(&node->list);
2107 kfree(node);
2108 }
2109
807736f6 2110 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
cc47f66e
AQ		 2111}
2112
56303d34 2113static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
cc47f66e 2114{
56303d34 2115 struct batadv_tt_roam_node *node, *safe;
cc47f66e 2116
807736f6
SE		 2117 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2118 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
42d0b044
SE		 2119 if (!batadv_has_timed_out(node->first_time,
2120 BATADV_ROAMING_MAX_TIME))
cc47f66e
AQ		 2121 continue;
2122
2123 list_del(&node->list);
2124 kfree(node);
2125 }
807736f6 2126 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
cc47f66e
AQ		 2127}
2128
2129/* This function checks whether the client already reached the
2130 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2131 * will not be sent.
2132 *
9cfc7bd6
SE		 2133 * returns true if the ROAMING_ADV can be sent, false otherwise
2134 */
56303d34 2135static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
a513088d 2136 uint8_t *client)
cc47f66e 2137{
56303d34 2138 struct batadv_tt_roam_node *tt_roam_node;
cc47f66e
AQ		 2139 bool ret = false;
2140
807736f6 2141 spin_lock_bh(&bat_priv->tt.roam_list_lock);
cc47f66e 2142 /* The new tt_req will be issued only if I'm not waiting for a
9cfc7bd6
SE		 2143 * reply from the same orig_node yet
2144 */
807736f6 2145 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
1eda58bf 2146 if (!batadv_compare_eth(tt_roam_node->addr, client))
cc47f66e
AQ		 2147 continue;
2148
1eda58bf 2149 if (batadv_has_timed_out(tt_roam_node->first_time,
42d0b044 2150 BATADV_ROAMING_MAX_TIME))
cc47f66e
AQ		 2151 continue;
2152
3e34819e 2153 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
cc47f66e
AQ		 2154 /* Sorry, you roamed too many times! */
2155 goto unlock;
2156 ret = true;
2157 break;
2158 }
2159
2160 if (!ret) {
2161 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2162 if (!tt_roam_node)
2163 goto unlock;
2164
2165 tt_roam_node->first_time = jiffies;
42d0b044
SE		 2166 atomic_set(&tt_roam_node->counter,
2167 BATADV_ROAMING_MAX_COUNT - 1);
cc47f66e
AQ		 2168 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2169
807736f6 2170 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
cc47f66e
AQ		 2171 ret = true;
2172 }
2173
2174unlock:
807736f6 2175 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
cc47f66e
AQ		 2176 return ret;
2177}
2178
56303d34
SE		 2179static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2180 struct batadv_orig_node *orig_node)
cc47f66e 2181{
56303d34 2182 struct batadv_neigh_node *neigh_node = NULL;
cc47f66e 2183 struct sk_buff *skb = NULL;
96412690 2184 struct batadv_roam_adv_packet *roam_adv_packet;
cc47f66e 2185 int ret = 1;
56303d34 2186 struct batadv_hard_iface *primary_if;
96412690 2187 size_t len = sizeof(*roam_adv_packet);
cc47f66e
AQ		 2188
2189 /* before going on we have to check whether the client has
9cfc7bd6
SE		 2190 * already roamed to us too many times
2191 */
a513088d 2192 if (!batadv_tt_check_roam_count(bat_priv, client))
cc47f66e
AQ		 2193 goto out;
2194
5b246574 2195 skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN + NET_IP_ALIGN);
cc47f66e
AQ		 2196 if (!skb)
2197 goto out;
2198
5b246574 2199 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
cc47f66e 2200
96412690 2201 roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len);
cc47f66e 2202
acd34afa 2203 roam_adv_packet->header.packet_type = BATADV_ROAM_ADV;
7e071c79 2204 roam_adv_packet->header.version = BATADV_COMPAT_VERSION;
42d0b044 2205 roam_adv_packet->header.ttl = BATADV_TTL;
162d549c 2206 roam_adv_packet->reserved = 0;
e5d89254 2207 primary_if = batadv_primary_if_get_selected(bat_priv);
cc47f66e
AQ		 2208 if (!primary_if)
2209 goto out;
2210 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
e5d89254 2211 batadv_hardif_free_ref(primary_if);
cc47f66e
AQ		 2212 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
2213 memcpy(roam_adv_packet->client, client, ETH_ALEN);
2214
7d211efc 2215 neigh_node = batadv_orig_node_get_router(orig_node);
cc47f66e
AQ		 2216 if (!neigh_node)
2217 goto out;
2218
39c75a51 2219 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 2220 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
2221 orig_node->orig, client, neigh_node->addr);
cc47f66e 2222
d69909d2 2223 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
f8214865 2224
9455e34c 2225 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
cc47f66e
AQ		 2226 ret = 0;
2227
2228out:
2229 if (neigh_node)
7d211efc 2230 batadv_neigh_node_free_ref(neigh_node);
cc47f66e
AQ		 2231 if (ret)
2232 kfree_skb(skb);
2233 return;
a73105b8
AQ		 2234}
2235
a513088d 2236static void batadv_tt_purge(struct work_struct *work)
a73105b8 2237{
56303d34 2238 struct delayed_work *delayed_work;
807736f6 2239 struct batadv_priv_tt *priv_tt;
56303d34
SE		 2240 struct batadv_priv *bat_priv;
2241
2242 delayed_work = container_of(work, struct delayed_work, work);
807736f6
SE		 2243 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2244 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
a73105b8 2245
a513088d 2246 batadv_tt_local_purge(bat_priv);
30cfd02b 2247 batadv_tt_global_purge(bat_priv);
a513088d
SE		 2248 batadv_tt_req_purge(bat_priv);
2249 batadv_tt_roam_purge(bat_priv);
a73105b8 2250
a513088d 2251 batadv_tt_start_timer(bat_priv);
a73105b8 2252}
cc47f66e 2253
56303d34 2254void batadv_tt_free(struct batadv_priv *bat_priv)
cc47f66e 2255{
807736f6 2256 cancel_delayed_work_sync(&bat_priv->tt.work);
cc47f66e 2257
a513088d
SE		 2258 batadv_tt_local_table_free(bat_priv);
2259 batadv_tt_global_table_free(bat_priv);
2260 batadv_tt_req_list_free(bat_priv);
2261 batadv_tt_changes_list_free(bat_priv);
2262 batadv_tt_roam_list_free(bat_priv);
cc47f66e 2263
807736f6 2264 kfree(bat_priv->tt.last_changeset);
cc47f66e 2265}
058d0e26 2266
697f2531 2267/* This function will enable or disable the specified flags for all the entries
9cfc7bd6
SE		 2268 * in the given hash table and returns the number of modified entries
2269 */
5bf74e9c
SE		 2270static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash,
2271 uint16_t flags, bool enable)
058d0e26 2272{
c90681b8 2273 uint32_t i;
697f2531 2274 uint16_t changed_num = 0;
058d0e26
AQ		 2275 struct hlist_head *head;
2276 struct hlist_node *node;
56303d34 2277 struct batadv_tt_common_entry *tt_common_entry;
058d0e26
AQ		 2278
2279 if (!hash)
697f2531 2280 goto out;
058d0e26
AQ		 2281
2282 for (i = 0; i < hash->size; i++) {
2283 head = &hash->table[i];
2284
2285 rcu_read_lock();
48100bac 2286 hlist_for_each_entry_rcu(tt_common_entry, node,
058d0e26 2287 head, hash_entry) {
697f2531
AQ		 2288 if (enable) {
2289 if ((tt_common_entry->flags & flags) == flags)
2290 continue;
2291 tt_common_entry->flags |= flags;
2292 } else {
2293 if (!(tt_common_entry->flags & flags))
2294 continue;
2295 tt_common_entry->flags &= ~flags;
2296 }
2297 changed_num++;
058d0e26
AQ		 2298 }
2299 rcu_read_unlock();
2300 }
697f2531
AQ		 2301out:
2302 return changed_num;
058d0e26
AQ		 2303}
2304
acd34afa 2305/* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
56303d34 2306static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
058d0e26 2307{
807736f6 2308 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
56303d34
SE		 2309 struct batadv_tt_common_entry *tt_common;
2310 struct batadv_tt_local_entry *tt_local;
058d0e26
AQ		 2311 struct hlist_node *node, *node_tmp;
2312 struct hlist_head *head;
2313 spinlock_t *list_lock; /* protects write access to the hash lists */
c90681b8 2314 uint32_t i;
058d0e26
AQ		 2315
2316 if (!hash)
2317 return;
2318
2319 for (i = 0; i < hash->size; i++) {
2320 head = &hash->table[i];
2321 list_lock = &hash->list_locks[i];
2322
2323 spin_lock_bh(list_lock);
acd34afa
SE		 2324 hlist_for_each_entry_safe(tt_common, node, node_tmp, head,
2325 hash_entry) {
2326 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
058d0e26
AQ		 2327 continue;
2328
39c75a51 2329 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf 2330 "Deleting local tt entry (%pM): pending\n",
acd34afa 2331 tt_common->addr);
058d0e26 2332
807736f6 2333 atomic_dec(&bat_priv->tt.local_entry_num);
058d0e26 2334 hlist_del_rcu(node);
56303d34
SE		 2335 tt_local = container_of(tt_common,
2336 struct batadv_tt_local_entry,
2337 common);
2338 batadv_tt_local_entry_free_ref(tt_local);
058d0e26
AQ		 2339 }
2340 spin_unlock_bh(list_lock);
2341 }
2342
2343}
2344
56303d34 2345static int batadv_tt_commit_changes(struct batadv_priv *bat_priv,
a513088d
SE		 2346 unsigned char **packet_buff,
2347 int *packet_buff_len, int packet_min_len)
058d0e26 2348{
be9aa4c1
ML		 2349 uint16_t changed_num = 0;
2350
807736f6 2351 if (atomic_read(&bat_priv->tt.local_changes) < 1)
be9aa4c1
ML		 2352 return -ENOENT;
2353
807736f6 2354 changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash,
acd34afa 2355 BATADV_TT_CLIENT_NEW, false);
be9aa4c1
ML		 2356
2357 /* all reset entries have to be counted as local entries */
807736f6 2358 atomic_add(changed_num, &bat_priv->tt.local_entry_num);
a513088d 2359 batadv_tt_local_purge_pending_clients(bat_priv);
807736f6 2360 bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv);
058d0e26
AQ		 2361
2362 /* Increment the TTVN only once per OGM interval */
807736f6 2363 atomic_inc(&bat_priv->tt.vn);
39c75a51 2364 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf 2365 "Local changes committed, updating to ttvn %u\n",
807736f6 2366 (uint8_t)atomic_read(&bat_priv->tt.vn));
be9aa4c1
ML		 2367
2368 /* reset the sending counter */
807736f6 2369 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
be9aa4c1 2370
a513088d
SE		 2371 return batadv_tt_changes_fill_buff(bat_priv, packet_buff,
2372 packet_buff_len, packet_min_len);
be9aa4c1
ML		 2373}
2374
2375/* when calling this function (hard_iface == primary_if) has to be true */
56303d34 2376int batadv_tt_append_diff(struct batadv_priv *bat_priv,
be9aa4c1
ML		 2377 unsigned char **packet_buff, int *packet_buff_len,
2378 int packet_min_len)
2379{
2380 int tt_num_changes;
2381
2382 /* if at least one change happened */
a513088d
SE		 2383 tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff,
2384 packet_buff_len,
2385 packet_min_len);
be9aa4c1
ML		 2386
2387 /* if the changes have been sent often enough */
2388 if ((tt_num_changes < 0) &&
807736f6 2389 (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) {
a513088d
SE		 2390 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
2391 packet_min_len, packet_min_len);
be9aa4c1
ML		 2392 tt_num_changes = 0;
2393 }
2394
2395 return tt_num_changes;
058d0e26 2396}
59b699cd 2397
56303d34 2398bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
08c36d3e 2399 uint8_t *dst)
59b699cd 2400{
56303d34
SE		 2401 struct batadv_tt_local_entry *tt_local_entry = NULL;
2402 struct batadv_tt_global_entry *tt_global_entry = NULL;
5870adc6 2403 bool ret = false;
59b699cd
AQ		 2404
2405 if (!atomic_read(&bat_priv->ap_isolation))
5870adc6 2406 goto out;
59b699cd 2407
a513088d 2408 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst);
59b699cd
AQ		 2409 if (!tt_local_entry)
2410 goto out;
2411
a513088d 2412 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src);
59b699cd
AQ		 2413 if (!tt_global_entry)
2414 goto out;
2415
1f129fef 2416 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
59b699cd
AQ		 2417 goto out;
2418
5870adc6 2419 ret = true;
59b699cd
AQ		 2420
2421out:
2422 if (tt_global_entry)
a513088d 2423 batadv_tt_global_entry_free_ref(tt_global_entry);
59b699cd 2424 if (tt_local_entry)
a513088d 2425 batadv_tt_local_entry_free_ref(tt_local_entry);
59b699cd
AQ		 2426 return ret;
2427}
a943cac1 2428
56303d34
SE		 2429void batadv_tt_update_orig(struct batadv_priv *bat_priv,
2430 struct batadv_orig_node *orig_node,
08c36d3e
SE		 2431 const unsigned char *tt_buff, uint8_t tt_num_changes,
2432 uint8_t ttvn, uint16_t tt_crc)
a943cac1
ML		 2433{
2434 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
2435 bool full_table = true;
96412690 2436 struct batadv_tt_change *tt_change;
a943cac1 2437
20ff9d59 2438 /* don't care about a backbone gateways updates. */
08adf151 2439 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
20ff9d59
SW		 2440 return;
2441
17071578 2442 /* orig table not initialised AND first diff is in the OGM OR the ttvn
9cfc7bd6
SE		 2443 * increased by one -> we can apply the attached changes
2444 */
17071578
AQ		 2445 if ((!orig_node->tt_initialised && ttvn == 1) ||
2446 ttvn - orig_ttvn == 1) {
a943cac1 2447 /* the OGM could not contain the changes due to their size or
42d0b044
SE		 2448 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
2449 * times.
9cfc7bd6
SE		 2450 * In this case send a tt request
2451 */
a943cac1
ML		 2452 if (!tt_num_changes) {
2453 full_table = false;
2454 goto request_table;
2455 }
2456
96412690 2457 tt_change = (struct batadv_tt_change *)tt_buff;
a513088d 2458 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
96412690 2459 ttvn, tt_change);
a943cac1
ML		 2460
2461 /* Even if we received the precomputed crc with the OGM, we
2462 * prefer to recompute it to spot any possible inconsistency
9cfc7bd6
SE		 2463 * in the global table
2464 */
a513088d 2465 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
a943cac1
ML		 2466
2467 /* The ttvn alone is not enough to guarantee consistency
2468 * because a single value could represent different states
2469 * (due to the wrap around). Thus a node has to check whether
2470 * the resulting table (after applying the changes) is still
2471 * consistent or not. E.g. a node could disconnect while its
2472 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2473 * checking the CRC value is mandatory to detect the
9cfc7bd6
SE		 2474 * inconsistency
2475 */
a943cac1
ML		 2476 if (orig_node->tt_crc != tt_crc)
2477 goto request_table;
a943cac1
ML		 2478 } else {
2479 /* if we missed more than one change or our tables are not
9cfc7bd6
SE		 2480 * in sync anymore -> request fresh tt data
2481 */
17071578
AQ		 2482 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
2483 orig_node->tt_crc != tt_crc) {
a943cac1 2484request_table:
39c75a51 2485 batadv_dbg(BATADV_DBG_TT, bat_priv,
1eda58bf
SE		 2486 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2487 orig_node->orig, ttvn, orig_ttvn, tt_crc,
2488 orig_node->tt_crc, tt_num_changes);
a513088d
SE		 2489 batadv_send_tt_request(bat_priv, orig_node, ttvn,
2490 tt_crc, full_table);
a943cac1
ML		 2491 return;
2492 }
2493 }
2494}
3275e7cc
AQ		 2495
2496/* returns true whether we know that the client has moved from its old
2497 * originator to another one. This entry is kept is still kept for consistency
2498 * purposes
2499 */
56303d34 2500bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
08c36d3e 2501 uint8_t *addr)
3275e7cc 2502{
56303d34 2503 struct batadv_tt_global_entry *tt_global_entry;
3275e7cc
AQ		 2504 bool ret = false;
2505
a513088d 2506 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
3275e7cc
AQ		 2507 if (!tt_global_entry)
2508 goto out;
2509
9f9ff08d 2510 ret = !!(tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM);
a513088d 2511 batadv_tt_global_entry_free_ref(tt_global_entry);
3275e7cc
AQ		 2512out:
2513 return ret;
2514}
30cfd02b 2515
7c1fd91d
AQ		 2516/**
2517 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
2518 * @bat_priv: the bat priv with all the soft interface information
2519 * @addr: the MAC address of the local client to query
2520 *
2521 * Returns true if the local client is known to be roaming (it is not served by
2522 * this node anymore) or not. If yes, the client is still present in the table
2523 * to keep the latter consistent with the node TTVN
2524 */
2525bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
2526 uint8_t *addr)
2527{
2528 struct batadv_tt_local_entry *tt_local_entry;
2529 bool ret = false;
2530
2531 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
2532 if (!tt_local_entry)
2533 goto out;
2534
2535 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
2536 batadv_tt_local_entry_free_ref(tt_local_entry);
2537out:
2538 return ret;
2539
2540}
2541
30cfd02b
AQ		 2542bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
2543 struct batadv_orig_node *orig_node,
2544 const unsigned char *addr)
2545{
2546 bool ret = false;
2547
2548 if (!batadv_tt_global_add(bat_priv, orig_node, addr,
2549 BATADV_TT_CLIENT_TEMP,
2550 atomic_read(&orig_node->last_ttvn)))
2551 goto out;
2552
2553 batadv_dbg(BATADV_DBG_TT, bat_priv,
2554 "Added temporary global client (addr: %pM orig: %pM)\n",
2555 addr, orig_node->orig);
2556 ret = true;
2557out:
2558 return ret;
2559}
Linux 6.x block layer and io_uring tree(s)