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staging: rtl8192u: fix spaces in array indexing in r8192U_core.c
[linux-2.6.git] / net / batman-adv / translation-table.c
blob9e87485758455743984bf51bf783c7bf61cee348
1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
2 *
3 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
18 */
19
20 #include "main.h"
21 #include "translation-table.h"
22 #include "soft-interface.h"
23 #include "hard-interface.h"
24 #include "send.h"
25 #include "hash.h"
26 #include "originator.h"
27 #include "routing.h"
28 #include "bridge_loop_avoidance.h"
29
30 #include <linux/crc16.h>
31
32 /* hash class keys */
33 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
34 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
35
36 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
37 struct batadv_orig_node *orig_node);
38 static void batadv_tt_purge(struct work_struct *work);
39 static void
40 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
41 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
42 struct batadv_orig_node *orig_node,
43 const unsigned char *addr,
44 const char *message, bool roaming);
45
46 /* returns 1 if they are the same mac addr */
47 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
48 {
49 const void *data1 = container_of(node, struct batadv_tt_common_entry,
50 hash_entry);
51
52 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
53 }
54
55 static struct batadv_tt_common_entry *
56 batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data)
57 {
58 struct hlist_head *head;
59 struct batadv_tt_common_entry *tt_common_entry;
60 struct batadv_tt_common_entry *tt_common_entry_tmp = NULL;
61 uint32_t index;
62
63 if (!hash)
64 return NULL;
65
66 index = batadv_choose_orig(data, hash->size);
67 head = &hash->table[index];
68
69 rcu_read_lock();
70 hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) {
71 if (!batadv_compare_eth(tt_common_entry, data))
72 continue;
73
74 if (!atomic_inc_not_zero(&tt_common_entry->refcount))
75 continue;
76
77 tt_common_entry_tmp = tt_common_entry;
78 break;
79 }
80 rcu_read_unlock();
81
82 return tt_common_entry_tmp;
83 }
84
85 static struct batadv_tt_local_entry *
86 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data)
87 {
88 struct batadv_tt_common_entry *tt_common_entry;
89 struct batadv_tt_local_entry *tt_local_entry = NULL;
90
91 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data);
92 if (tt_common_entry)
93 tt_local_entry = container_of(tt_common_entry,
94 struct batadv_tt_local_entry,
95 common);
96 return tt_local_entry;
97 }
98
99 static struct batadv_tt_global_entry *
100 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data)
101 {
102 struct batadv_tt_common_entry *tt_common_entry;
103 struct batadv_tt_global_entry *tt_global_entry = NULL;
104
105 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data);
106 if (tt_common_entry)
107 tt_global_entry = container_of(tt_common_entry,
108 struct batadv_tt_global_entry,
109 common);
110 return tt_global_entry;
111 }
112
113 static void
114 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
115 {
116 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
117 kfree_rcu(tt_local_entry, common.rcu);
118 }
119
120 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
121 {
122 struct batadv_tt_common_entry *tt_common_entry;
123 struct batadv_tt_global_entry *tt_global_entry;
124
125 tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu);
126 tt_global_entry = container_of(tt_common_entry,
127 struct batadv_tt_global_entry, common);
128
129 kfree(tt_global_entry);
130 }
131
132 static void
133 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
134 {
135 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
136 batadv_tt_global_del_orig_list(tt_global_entry);
137 call_rcu(&tt_global_entry->common.rcu,
138 batadv_tt_global_entry_free_rcu);
139 }
140 }
141
142 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
143 {
144 struct batadv_tt_orig_list_entry *orig_entry;
145
146 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
147
148 /* We are in an rcu callback here, therefore we cannot use
149 * batadv_orig_node_free_ref() and its call_rcu():
150 * An rcu_barrier() wouldn't wait for that to finish
151 */
152 batadv_orig_node_free_ref_now(orig_entry->orig_node);
153 kfree(orig_entry);
154 }
155
156 static void
157 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
158 {
159 if (!atomic_dec_and_test(&orig_entry->refcount))
160 return;
161 /* to avoid race conditions, immediately decrease the tt counter */
162 atomic_dec(&orig_entry->orig_node->tt_size);
163 call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
164 }
165
166 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
167 const uint8_t *addr, uint8_t flags)
168 {
169 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
170 bool event_removed = false;
171 bool del_op_requested, del_op_entry;
172
173 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
174
175 if (!tt_change_node)
176 return;
177
178 tt_change_node->change.flags = flags;
179 memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
180
181 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
182
183 /* check for ADD+DEL or DEL+ADD events */
184 spin_lock_bh(&bat_priv->tt.changes_list_lock);
185 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
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 */
197 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
198 if (!del_op_requested && del_op_entry)
199 goto del;
200 if (del_op_requested && !del_op_entry)
201 goto del;
202 continue;
203 del:
204 list_del(&entry->list);
205 kfree(entry);
206 kfree(tt_change_node);
207 event_removed = true;
208 goto unlock;
209 }
210
211 /* track the change in the OGMinterval list */
212 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
213
214 unlock:
215 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
216
217 if (event_removed)
218 atomic_dec(&bat_priv->tt.local_changes);
219 else
220 atomic_inc(&bat_priv->tt.local_changes);
221 }
222
223 int batadv_tt_len(int changes_num)
224 {
225 return changes_num * sizeof(struct batadv_tt_change);
226 }
227
228 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
229 {
230 if (bat_priv->tt.local_hash)
231 return 0;
232
233 bat_priv->tt.local_hash = batadv_hash_new(1024);
234
235 if (!bat_priv->tt.local_hash)
236 return -ENOMEM;
237
238 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
239 &batadv_tt_local_hash_lock_class_key);
240
241 return 0;
242 }
243
244 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
245 struct batadv_tt_global_entry *tt_global,
246 const char *message)
247 {
248 batadv_dbg(BATADV_DBG_TT, bat_priv,
249 "Deleting global tt entry %pM: %s\n",
250 tt_global->common.addr, message);
251
252 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
253 batadv_choose_orig, tt_global->common.addr);
254 batadv_tt_global_entry_free_ref(tt_global);
255 }
256
257 void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
258 int ifindex)
259 {
260 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
261 struct batadv_tt_local_entry *tt_local;
262 struct batadv_tt_global_entry *tt_global;
263 struct hlist_head *head;
264 struct batadv_tt_orig_list_entry *orig_entry;
265 int hash_added;
266 bool roamed_back = false;
267
268 tt_local = batadv_tt_local_hash_find(bat_priv, addr);
269 tt_global = batadv_tt_global_hash_find(bat_priv, addr);
270
271 if (tt_local) {
272 tt_local->last_seen = jiffies;
273 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
274 batadv_dbg(BATADV_DBG_TT, bat_priv,
275 "Re-adding pending client %pM\n", addr);
276 /* whatever the reason why the PENDING flag was set,
277 * this is a client which was enqueued to be removed in
278 * this orig_interval. Since it popped up again, the
279 * flag can be reset like it was never enqueued
280 */
281 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
282 goto add_event;
283 }
284
285 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
286 batadv_dbg(BATADV_DBG_TT, bat_priv,
287 "Roaming client %pM came back to its original location\n",
288 addr);
289 /* the ROAM flag is set because this client roamed away
290 * and the node got a roaming_advertisement message. Now
291 * that the client popped up again at its original
292 * location such flag can be unset
293 */
294 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
295 roamed_back = true;
296 }
297 goto check_roaming;
298 }
299
300 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
301 if (!tt_local)
302 goto out;
303
304 batadv_dbg(BATADV_DBG_TT, bat_priv,
305 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
306 (uint8_t)atomic_read(&bat_priv->tt.vn));
307
308 memcpy(tt_local->common.addr, addr, ETH_ALEN);
309 /* The local entry has to be marked as NEW to avoid to send it in
310 * a full table response going out before the next ttvn increment
311 * (consistency check)
312 */
313 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
314 if (batadv_is_wifi_iface(ifindex))
315 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
316 atomic_set(&tt_local->common.refcount, 2);
317 tt_local->last_seen = jiffies;
318 tt_local->common.added_at = tt_local->last_seen;
319
320 /* the batman interface mac address should never be purged */
321 if (batadv_compare_eth(addr, soft_iface->dev_addr))
322 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
323
324 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
325 batadv_choose_orig, &tt_local->common,
326 &tt_local->common.hash_entry);
327
328 if (unlikely(hash_added != 0)) {
329 /* remove the reference for the hash */
330 batadv_tt_local_entry_free_ref(tt_local);
331 goto out;
332 }
333
334 add_event:
335 batadv_tt_local_event(bat_priv, addr, tt_local->common.flags);
336
337 check_roaming:
338 /* Check whether it is a roaming, but don't do anything if the roaming
339 * process has already been handled
340 */
341 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
342 /* These node are probably going to update their tt table */
343 head = &tt_global->orig_list;
344 rcu_read_lock();
345 hlist_for_each_entry_rcu(orig_entry, head, list) {
346 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
347 orig_entry->orig_node);
348 }
349 rcu_read_unlock();
350 if (roamed_back) {
351 batadv_tt_global_free(bat_priv, tt_global,
352 "Roaming canceled");
353 tt_global = NULL;
354 } else {
355 /* The global entry has to be marked as ROAMING and
356 * has to be kept for consistency purpose
357 */
358 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
359 tt_global->roam_at = jiffies;
360 }
361 }
362
363 out:
364 if (tt_local)
365 batadv_tt_local_entry_free_ref(tt_local);
366 if (tt_global)
367 batadv_tt_global_entry_free_ref(tt_global);
368 }
369
370 static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff,
371 int *packet_buff_len,
372 int min_packet_len,
373 int new_packet_len)
374 {
375 unsigned char *new_buff;
376
377 new_buff = kmalloc(new_packet_len, GFP_ATOMIC);
378
379 /* keep old buffer if kmalloc should fail */
380 if (new_buff) {
381 memcpy(new_buff, *packet_buff, min_packet_len);
382 kfree(*packet_buff);
383 *packet_buff = new_buff;
384 *packet_buff_len = new_packet_len;
385 }
386 }
387
388 static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv,
389 unsigned char **packet_buff,
390 int *packet_buff_len,
391 int min_packet_len)
392 {
393 int req_len;
394
395 req_len = min_packet_len;
396 req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
397
398 /* if we have too many changes for one packet don't send any
399 * and wait for the tt table request which will be fragmented
400 */
401 if (req_len > bat_priv->soft_iface->mtu)
402 req_len = min_packet_len;
403
404 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
405 min_packet_len, req_len);
406 }
407
408 static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv,
409 unsigned char **packet_buff,
410 int *packet_buff_len,
411 int min_packet_len)
412 {
413 struct batadv_tt_change_node *entry, *safe;
414 int count = 0, tot_changes = 0, new_len;
415 unsigned char *tt_buff;
416
417 batadv_tt_prepare_packet_buff(bat_priv, packet_buff,
418 packet_buff_len, min_packet_len);
419
420 new_len = *packet_buff_len - min_packet_len;
421 tt_buff = *packet_buff + min_packet_len;
422
423 if (new_len > 0)
424 tot_changes = new_len / batadv_tt_len(1);
425
426 spin_lock_bh(&bat_priv->tt.changes_list_lock);
427 atomic_set(&bat_priv->tt.local_changes, 0);
428
429 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
430 list) {
431 if (count < tot_changes) {
432 memcpy(tt_buff + batadv_tt_len(count),
433 &entry->change, sizeof(struct batadv_tt_change));
434 count++;
435 }
436 list_del(&entry->list);
437 kfree(entry);
438 }
439 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
440
441 /* Keep the buffer for possible tt_request */
442 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
443 kfree(bat_priv->tt.last_changeset);
444 bat_priv->tt.last_changeset_len = 0;
445 bat_priv->tt.last_changeset = NULL;
446 /* check whether this new OGM has no changes due to size problems */
447 if (new_len > 0) {
448 /* if kmalloc() fails we will reply with the full table
449 * instead of providing the diff
450 */
451 bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC);
452 if (bat_priv->tt.last_changeset) {
453 memcpy(bat_priv->tt.last_changeset, tt_buff, new_len);
454 bat_priv->tt.last_changeset_len = new_len;
455 }
456 }
457 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
458
459 return count;
460 }
461
462 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
463 {
464 struct net_device *net_dev = (struct net_device *)seq->private;
465 struct batadv_priv *bat_priv = netdev_priv(net_dev);
466 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
467 struct batadv_tt_common_entry *tt_common_entry;
468 struct batadv_tt_local_entry *tt_local;
469 struct batadv_hard_iface *primary_if;
470 struct hlist_head *head;
471 uint32_t i;
472 int last_seen_secs;
473 int last_seen_msecs;
474 unsigned long last_seen_jiffies;
475 bool no_purge;
476 uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
477
478 primary_if = batadv_seq_print_text_primary_if_get(seq);
479 if (!primary_if)
480 goto out;
481
482 seq_printf(seq,
483 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.4x):\n",
484 net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn),
485 bat_priv->tt.local_crc);
486 seq_printf(seq, " %-13s %-7s %-10s\n", "Client", "Flags",
487 "Last seen");
488
489 for (i = 0; i < hash->size; i++) {
490 head = &hash->table[i];
491
492 rcu_read_lock();
493 hlist_for_each_entry_rcu(tt_common_entry,
494 head, hash_entry) {
495 tt_local = container_of(tt_common_entry,
496 struct batadv_tt_local_entry,
497 common);
498 last_seen_jiffies = jiffies - tt_local->last_seen;
499 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
500 last_seen_secs = last_seen_msecs / 1000;
501 last_seen_msecs = last_seen_msecs % 1000;
502
503 no_purge = tt_common_entry->flags & np_flag;
504
505 seq_printf(seq, " * %pM [%c%c%c%c%c] %3u.%03u\n",
506 tt_common_entry->addr,
507 (tt_common_entry->flags &
508 BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
509 no_purge ? 'P' : '.',
510 (tt_common_entry->flags &
511 BATADV_TT_CLIENT_NEW ? 'N' : '.'),
512 (tt_common_entry->flags &
513 BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
514 (tt_common_entry->flags &
515 BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
516 no_purge ? 0 : last_seen_secs,
517 no_purge ? 0 : last_seen_msecs);
518 }
519 rcu_read_unlock();
520 }
521 out:
522 if (primary_if)
523 batadv_hardif_free_ref(primary_if);
524 return 0;
525 }
526
527 static void
528 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
529 struct batadv_tt_local_entry *tt_local_entry,
530 uint16_t flags, const char *message)
531 {
532 batadv_tt_local_event(bat_priv, tt_local_entry->common.addr,
533 tt_local_entry->common.flags | flags);
534
535 /* The local client has to be marked as "pending to be removed" but has
536 * to be kept in the table in order to send it in a full table
537 * response issued before the net ttvn increment (consistency check)
538 */
539 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
540
541 batadv_dbg(BATADV_DBG_TT, bat_priv,
542 "Local tt entry (%pM) pending to be removed: %s\n",
543 tt_local_entry->common.addr, message);
544 }
545
546 /**
547 * batadv_tt_local_remove - logically remove an entry from the local table
548 * @bat_priv: the bat priv with all the soft interface information
549 * @addr: the MAC address of the client to remove
550 * @message: message to append to the log on deletion
551 * @roaming: true if the deletion is due to a roaming event
552 *
553 * Returns the flags assigned to the local entry before being deleted
554 */
555 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
556 const uint8_t *addr, const char *message,
557 bool roaming)
558 {
559 struct batadv_tt_local_entry *tt_local_entry;
560 uint16_t flags, curr_flags = BATADV_NO_FLAGS;
561
562 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
563 if (!tt_local_entry)
564 goto out;
565
566 curr_flags = tt_local_entry->common.flags;
567
568 flags = BATADV_TT_CLIENT_DEL;
569 /* if this global entry addition is due to a roaming, the node has to
570 * mark the local entry as "roamed" in order to correctly reroute
571 * packets later
572 */
573 if (roaming) {
574 flags |= BATADV_TT_CLIENT_ROAM;
575 /* mark the local client as ROAMed */
576 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
577 }
578
579 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
580 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
581 message);
582 goto out;
583 }
584 /* if this client has been added right now, it is possible to
585 * immediately purge it
586 */
587 batadv_tt_local_event(bat_priv, tt_local_entry->common.addr,
588 curr_flags | BATADV_TT_CLIENT_DEL);
589 hlist_del_rcu(&tt_local_entry->common.hash_entry);
590 batadv_tt_local_entry_free_ref(tt_local_entry);
591
592 out:
593 if (tt_local_entry)
594 batadv_tt_local_entry_free_ref(tt_local_entry);
595
596 return curr_flags;
597 }
598
599 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
600 struct hlist_head *head)
601 {
602 struct batadv_tt_local_entry *tt_local_entry;
603 struct batadv_tt_common_entry *tt_common_entry;
604 struct hlist_node *node_tmp;
605
606 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
607 hash_entry) {
608 tt_local_entry = container_of(tt_common_entry,
609 struct batadv_tt_local_entry,
610 common);
611 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
612 continue;
613
614 /* entry already marked for deletion */
615 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
616 continue;
617
618 if (!batadv_has_timed_out(tt_local_entry->last_seen,
619 BATADV_TT_LOCAL_TIMEOUT))
620 continue;
621
622 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
623 BATADV_TT_CLIENT_DEL, "timed out");
624 }
625 }
626
627 static void batadv_tt_local_purge(struct batadv_priv *bat_priv)
628 {
629 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
630 struct hlist_head *head;
631 spinlock_t *list_lock; /* protects write access to the hash lists */
632 uint32_t i;
633
634 for (i = 0; i < hash->size; i++) {
635 head = &hash->table[i];
636 list_lock = &hash->list_locks[i];
637
638 spin_lock_bh(list_lock);
639 batadv_tt_local_purge_list(bat_priv, head);
640 spin_unlock_bh(list_lock);
641 }
642 }
643
644 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
645 {
646 struct batadv_hashtable *hash;
647 spinlock_t *list_lock; /* protects write access to the hash lists */
648 struct batadv_tt_common_entry *tt_common_entry;
649 struct batadv_tt_local_entry *tt_local;
650 struct hlist_node *node_tmp;
651 struct hlist_head *head;
652 uint32_t i;
653
654 if (!bat_priv->tt.local_hash)
655 return;
656
657 hash = bat_priv->tt.local_hash;
658
659 for (i = 0; i < hash->size; i++) {
660 head = &hash->table[i];
661 list_lock = &hash->list_locks[i];
662
663 spin_lock_bh(list_lock);
664 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
665 head, hash_entry) {
666 hlist_del_rcu(&tt_common_entry->hash_entry);
667 tt_local = container_of(tt_common_entry,
668 struct batadv_tt_local_entry,
669 common);
670 batadv_tt_local_entry_free_ref(tt_local);
671 }
672 spin_unlock_bh(list_lock);
673 }
674
675 batadv_hash_destroy(hash);
676
677 bat_priv->tt.local_hash = NULL;
678 }
679
680 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
681 {
682 if (bat_priv->tt.global_hash)
683 return 0;
684
685 bat_priv->tt.global_hash = batadv_hash_new(1024);
686
687 if (!bat_priv->tt.global_hash)
688 return -ENOMEM;
689
690 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
691 &batadv_tt_global_hash_lock_class_key);
692
693 return 0;
694 }
695
696 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
697 {
698 struct batadv_tt_change_node *entry, *safe;
699
700 spin_lock_bh(&bat_priv->tt.changes_list_lock);
701
702 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
703 list) {
704 list_del(&entry->list);
705 kfree(entry);
706 }
707
708 atomic_set(&bat_priv->tt.local_changes, 0);
709 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
710 }
711
712 /* retrieves the orig_tt_list_entry belonging to orig_node from the
713 * batadv_tt_global_entry list
714 *
715 * returns it with an increased refcounter, NULL if not found
716 */
717 static struct batadv_tt_orig_list_entry *
718 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
719 const struct batadv_orig_node *orig_node)
720 {
721 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
722 const struct hlist_head *head;
723
724 rcu_read_lock();
725 head = &entry->orig_list;
726 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
727 if (tmp_orig_entry->orig_node != orig_node)
728 continue;
729 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
730 continue;
731
732 orig_entry = tmp_orig_entry;
733 break;
734 }
735 rcu_read_unlock();
736
737 return orig_entry;
738 }
739
740 /* find out if an orig_node is already in the list of a tt_global_entry.
741 * returns true if found, false otherwise
742 */
743 static bool
744 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
745 const struct batadv_orig_node *orig_node)
746 {
747 struct batadv_tt_orig_list_entry *orig_entry;
748 bool found = false;
749
750 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
751 if (orig_entry) {
752 found = true;
753 batadv_tt_orig_list_entry_free_ref(orig_entry);
754 }
755
756 return found;
757 }
758
759 static void
760 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
761 struct batadv_orig_node *orig_node, int ttvn)
762 {
763 struct batadv_tt_orig_list_entry *orig_entry;
764
765 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
766 if (orig_entry) {
767 /* refresh the ttvn: the current value could be a bogus one that
768 * was added during a "temporary client detection"
769 */
770 orig_entry->ttvn = ttvn;
771 goto out;
772 }
773
774 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
775 if (!orig_entry)
776 goto out;
777
778 INIT_HLIST_NODE(&orig_entry->list);
779 atomic_inc(&orig_node->refcount);
780 atomic_inc(&orig_node->tt_size);
781 orig_entry->orig_node = orig_node;
782 orig_entry->ttvn = ttvn;
783 atomic_set(&orig_entry->refcount, 2);
784
785 spin_lock_bh(&tt_global->list_lock);
786 hlist_add_head_rcu(&orig_entry->list,
787 &tt_global->orig_list);
788 spin_unlock_bh(&tt_global->list_lock);
789 out:
790 if (orig_entry)
791 batadv_tt_orig_list_entry_free_ref(orig_entry);
792 }
793
794 /* caller must hold orig_node refcount */
795 int batadv_tt_global_add(struct batadv_priv *bat_priv,
796 struct batadv_orig_node *orig_node,
797 const unsigned char *tt_addr, uint8_t flags,
798 uint8_t ttvn)
799 {
800 struct batadv_tt_global_entry *tt_global_entry;
801 struct batadv_tt_local_entry *tt_local_entry;
802 int ret = 0;
803 int hash_added;
804 struct batadv_tt_common_entry *common;
805 uint16_t local_flags;
806
807 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr);
808 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr);
809
810 /* if the node already has a local client for this entry, it has to wait
811 * for a roaming advertisement instead of manually messing up the global
812 * table
813 */
814 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
815 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
816 goto out;
817
818 if (!tt_global_entry) {
819 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
820 if (!tt_global_entry)
821 goto out;
822
823 common = &tt_global_entry->common;
824 memcpy(common->addr, tt_addr, ETH_ALEN);
825
826 common->flags = flags;
827 tt_global_entry->roam_at = 0;
828 /* node must store current time in case of roaming. This is
829 * needed to purge this entry out on timeout (if nobody claims
830 * it)
831 */
832 if (flags & BATADV_TT_CLIENT_ROAM)
833 tt_global_entry->roam_at = jiffies;
834 atomic_set(&common->refcount, 2);
835 common->added_at = jiffies;
836
837 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
838 spin_lock_init(&tt_global_entry->list_lock);
839
840 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
841 batadv_compare_tt,
842 batadv_choose_orig, common,
843 &common->hash_entry);
844
845 if (unlikely(hash_added != 0)) {
846 /* remove the reference for the hash */
847 batadv_tt_global_entry_free_ref(tt_global_entry);
848 goto out_remove;
849 }
850 } else {
851 common = &tt_global_entry->common;
852 /* If there is already a global entry, we can use this one for
853 * our processing.
854 * But if we are trying to add a temporary client then here are
855 * two options at this point:
856 * 1) the global client is not a temporary client: the global
857 * client has to be left as it is, temporary information
858 * should never override any already known client state
859 * 2) the global client is a temporary client: purge the
860 * originator list and add the new one orig_entry
861 */
862 if (flags & BATADV_TT_CLIENT_TEMP) {
863 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
864 goto out;
865 if (batadv_tt_global_entry_has_orig(tt_global_entry,
866 orig_node))
867 goto out_remove;
868 batadv_tt_global_del_orig_list(tt_global_entry);
869 goto add_orig_entry;
870 }
871
872 /* if the client was temporary added before receiving the first
873 * OGM announcing it, we have to clear the TEMP flag
874 */
875 common->flags &= ~BATADV_TT_CLIENT_TEMP;
876
877 /* the change can carry possible "attribute" flags like the
878 * TT_CLIENT_WIFI, therefore they have to be copied in the
879 * client entry
880 */
881 tt_global_entry->common.flags |= flags;
882
883 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
884 * one originator left in the list and we previously received a
885 * delete + roaming change for this originator.
886 *
887 * We should first delete the old originator before adding the
888 * new one.
889 */
890 if (common->flags & BATADV_TT_CLIENT_ROAM) {
891 batadv_tt_global_del_orig_list(tt_global_entry);
892 common->flags &= ~BATADV_TT_CLIENT_ROAM;
893 tt_global_entry->roam_at = 0;
894 }
895 }
896 add_orig_entry:
897 /* add the new orig_entry (if needed) or update it */
898 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
899
900 batadv_dbg(BATADV_DBG_TT, bat_priv,
901 "Creating new global tt entry: %pM (via %pM)\n",
902 common->addr, orig_node->orig);
903 ret = 1;
904
905 out_remove:
906
907 /* remove address from local hash if present */
908 local_flags = batadv_tt_local_remove(bat_priv, tt_addr,
909 "global tt received",
910 flags & BATADV_TT_CLIENT_ROAM);
911 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
912
913 if (!(flags & BATADV_TT_CLIENT_ROAM))
914 /* this is a normal global add. Therefore the client is not in a
915 * roaming state anymore.
916 */
917 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
918
919 out:
920 if (tt_global_entry)
921 batadv_tt_global_entry_free_ref(tt_global_entry);
922 if (tt_local_entry)
923 batadv_tt_local_entry_free_ref(tt_local_entry);
924 return ret;
925 }
926
927 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
928 * @tt_global_entry: global translation table entry to be analyzed
929 *
930 * This functon assumes the caller holds rcu_read_lock().
931 * Returns best originator list entry or NULL on errors.
932 */
933 static struct batadv_tt_orig_list_entry *
934 batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry)
935 {
936 struct batadv_neigh_node *router = NULL;
937 struct hlist_head *head;
938 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
939 int best_tq = 0;
940
941 head = &tt_global_entry->orig_list;
942 hlist_for_each_entry_rcu(orig_entry, head, list) {
943 router = batadv_orig_node_get_router(orig_entry->orig_node);
944 if (!router)
945 continue;
946
947 if (router->tq_avg > best_tq) {
948 best_entry = orig_entry;
949 best_tq = router->tq_avg;
950 }
951
952 batadv_neigh_node_free_ref(router);
953 }
954
955 return best_entry;
956 }
957
958 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
959 * for this global entry
960 * @tt_global_entry: global translation table entry to be printed
961 * @seq: debugfs table seq_file struct
962 *
963 * This functon assumes the caller holds rcu_read_lock().
964 */
965 static void
966 batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry,
967 struct seq_file *seq)
968 {
969 struct hlist_head *head;
970 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
971 struct batadv_tt_common_entry *tt_common_entry;
972 uint16_t flags;
973 uint8_t last_ttvn;
974
975 tt_common_entry = &tt_global_entry->common;
976 flags = tt_common_entry->flags;
977
978 best_entry = batadv_transtable_best_orig(tt_global_entry);
979 if (best_entry) {
980 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
981 seq_printf(seq,
982 " %c %pM (%3u) via %pM (%3u) (%#.4x) [%c%c%c]\n",
983 '*', tt_global_entry->common.addr,
984 best_entry->ttvn, best_entry->orig_node->orig,
985 last_ttvn, best_entry->orig_node->tt_crc,
986 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
987 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
988 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
989 }
990
991 head = &tt_global_entry->orig_list;
992
993 hlist_for_each_entry_rcu(orig_entry, head, list) {
994 if (best_entry == orig_entry)
995 continue;
996
997 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
998 seq_printf(seq, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n",
999 '+', tt_global_entry->common.addr,
1000 orig_entry->ttvn, orig_entry->orig_node->orig,
1001 last_ttvn,
1002 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1003 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1004 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1005 }
1006 }
1007
1008 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1009 {
1010 struct net_device *net_dev = (struct net_device *)seq->private;
1011 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1012 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1013 struct batadv_tt_common_entry *tt_common_entry;
1014 struct batadv_tt_global_entry *tt_global;
1015 struct batadv_hard_iface *primary_if;
1016 struct hlist_head *head;
1017 uint32_t i;
1018
1019 primary_if = batadv_seq_print_text_primary_if_get(seq);
1020 if (!primary_if)
1021 goto out;
1022
1023 seq_printf(seq,
1024 "Globally announced TT entries received via the mesh %s\n",
1025 net_dev->name);
1026 seq_printf(seq, " %-13s %s %-15s %s (%-6s) %s\n",
1027 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "CRC",
1028 "Flags");
1029
1030 for (i = 0; i < hash->size; i++) {
1031 head = &hash->table[i];
1032
1033 rcu_read_lock();
1034 hlist_for_each_entry_rcu(tt_common_entry,
1035 head, hash_entry) {
1036 tt_global = container_of(tt_common_entry,
1037 struct batadv_tt_global_entry,
1038 common);
1039 batadv_tt_global_print_entry(tt_global, seq);
1040 }
1041 rcu_read_unlock();
1042 }
1043 out:
1044 if (primary_if)
1045 batadv_hardif_free_ref(primary_if);
1046 return 0;
1047 }
1048
1049 /* deletes the orig list of a tt_global_entry */
1050 static void
1051 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1052 {
1053 struct hlist_head *head;
1054 struct hlist_node *safe;
1055 struct batadv_tt_orig_list_entry *orig_entry;
1056
1057 spin_lock_bh(&tt_global_entry->list_lock);
1058 head = &tt_global_entry->orig_list;
1059 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1060 hlist_del_rcu(&orig_entry->list);
1061 batadv_tt_orig_list_entry_free_ref(orig_entry);
1062 }
1063 spin_unlock_bh(&tt_global_entry->list_lock);
1064 }
1065
1066 static void
1067 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
1068 struct batadv_tt_global_entry *tt_global_entry,
1069 struct batadv_orig_node *orig_node,
1070 const char *message)
1071 {
1072 struct hlist_head *head;
1073 struct hlist_node *safe;
1074 struct batadv_tt_orig_list_entry *orig_entry;
1075
1076 spin_lock_bh(&tt_global_entry->list_lock);
1077 head = &tt_global_entry->orig_list;
1078 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1079 if (orig_entry->orig_node == orig_node) {
1080 batadv_dbg(BATADV_DBG_TT, bat_priv,
1081 "Deleting %pM from global tt entry %pM: %s\n",
1082 orig_node->orig,
1083 tt_global_entry->common.addr, message);
1084 hlist_del_rcu(&orig_entry->list);
1085 batadv_tt_orig_list_entry_free_ref(orig_entry);
1086 }
1087 }
1088 spin_unlock_bh(&tt_global_entry->list_lock);
1089 }
1090
1091 /* If the client is to be deleted, we check if it is the last origantor entry
1092 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1093 * timer, otherwise we simply remove the originator scheduled for deletion.
1094 */
1095 static void
1096 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1097 struct batadv_tt_global_entry *tt_global_entry,
1098 struct batadv_orig_node *orig_node,
1099 const char *message)
1100 {
1101 bool last_entry = true;
1102 struct hlist_head *head;
1103 struct batadv_tt_orig_list_entry *orig_entry;
1104
1105 /* no local entry exists, case 1:
1106 * Check if this is the last one or if other entries exist.
1107 */
1108
1109 rcu_read_lock();
1110 head = &tt_global_entry->orig_list;
1111 hlist_for_each_entry_rcu(orig_entry, head, list) {
1112 if (orig_entry->orig_node != orig_node) {
1113 last_entry = false;
1114 break;
1115 }
1116 }
1117 rcu_read_unlock();
1118
1119 if (last_entry) {
1120 /* its the last one, mark for roaming. */
1121 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1122 tt_global_entry->roam_at = jiffies;
1123 } else
1124 /* there is another entry, we can simply delete this
1125 * one and can still use the other one.
1126 */
1127 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1128 orig_node, message);
1129 }
1130
1131
1132
1133 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1134 struct batadv_orig_node *orig_node,
1135 const unsigned char *addr,
1136 const char *message, bool roaming)
1137 {
1138 struct batadv_tt_global_entry *tt_global_entry;
1139 struct batadv_tt_local_entry *local_entry = NULL;
1140
1141 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
1142 if (!tt_global_entry)
1143 goto out;
1144
1145 if (!roaming) {
1146 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1147 orig_node, message);
1148
1149 if (hlist_empty(&tt_global_entry->orig_list))
1150 batadv_tt_global_free(bat_priv, tt_global_entry,
1151 message);
1152
1153 goto out;
1154 }
1155
1156 /* if we are deleting a global entry due to a roam
1157 * event, there are two possibilities:
1158 * 1) the client roamed from node A to node B => if there
1159 * is only one originator left for this client, we mark
1160 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1161 * wait for node B to claim it. In case of timeout
1162 * the entry is purged.
1163 *
1164 * If there are other originators left, we directly delete
1165 * the originator.
1166 * 2) the client roamed to us => we can directly delete
1167 * the global entry, since it is useless now.
1168 */
1169 local_entry = batadv_tt_local_hash_find(bat_priv,
1170 tt_global_entry->common.addr);
1171 if (local_entry) {
1172 /* local entry exists, case 2: client roamed to us. */
1173 batadv_tt_global_del_orig_list(tt_global_entry);
1174 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1175 } else
1176 /* no local entry exists, case 1: check for roaming */
1177 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1178 orig_node, message);
1179
1180
1181 out:
1182 if (tt_global_entry)
1183 batadv_tt_global_entry_free_ref(tt_global_entry);
1184 if (local_entry)
1185 batadv_tt_local_entry_free_ref(local_entry);
1186 }
1187
1188 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1189 struct batadv_orig_node *orig_node,
1190 const char *message)
1191 {
1192 struct batadv_tt_global_entry *tt_global;
1193 struct batadv_tt_common_entry *tt_common_entry;
1194 uint32_t i;
1195 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1196 struct hlist_node *safe;
1197 struct hlist_head *head;
1198 spinlock_t *list_lock; /* protects write access to the hash lists */
1199
1200 if (!hash)
1201 return;
1202
1203 for (i = 0; i < hash->size; i++) {
1204 head = &hash->table[i];
1205 list_lock = &hash->list_locks[i];
1206
1207 spin_lock_bh(list_lock);
1208 hlist_for_each_entry_safe(tt_common_entry, safe,
1209 head, hash_entry) {
1210 tt_global = container_of(tt_common_entry,
1211 struct batadv_tt_global_entry,
1212 common);
1213
1214 batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1215 orig_node, message);
1216
1217 if (hlist_empty(&tt_global->orig_list)) {
1218 batadv_dbg(BATADV_DBG_TT, bat_priv,
1219 "Deleting global tt entry %pM: %s\n",
1220 tt_global->common.addr, message);
1221 hlist_del_rcu(&tt_common_entry->hash_entry);
1222 batadv_tt_global_entry_free_ref(tt_global);
1223 }
1224 }
1225 spin_unlock_bh(list_lock);
1226 }
1227 orig_node->tt_initialised = false;
1228 }
1229
1230 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1231 char **msg)
1232 {
1233 bool purge = false;
1234 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1235 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1236
1237 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1238 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1239 purge = true;
1240 *msg = "Roaming timeout\n";
1241 }
1242
1243 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1244 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1245 purge = true;
1246 *msg = "Temporary client timeout\n";
1247 }
1248
1249 return purge;
1250 }
1251
1252 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1253 {
1254 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1255 struct hlist_head *head;
1256 struct hlist_node *node_tmp;
1257 spinlock_t *list_lock; /* protects write access to the hash lists */
1258 uint32_t i;
1259 char *msg = NULL;
1260 struct batadv_tt_common_entry *tt_common;
1261 struct batadv_tt_global_entry *tt_global;
1262
1263 for (i = 0; i < hash->size; i++) {
1264 head = &hash->table[i];
1265 list_lock = &hash->list_locks[i];
1266
1267 spin_lock_bh(list_lock);
1268 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1269 hash_entry) {
1270 tt_global = container_of(tt_common,
1271 struct batadv_tt_global_entry,
1272 common);
1273
1274 if (!batadv_tt_global_to_purge(tt_global, &msg))
1275 continue;
1276
1277 batadv_dbg(BATADV_DBG_TT, bat_priv,
1278 "Deleting global tt entry (%pM): %s\n",
1279 tt_global->common.addr, msg);
1280
1281 hlist_del_rcu(&tt_common->hash_entry);
1282
1283 batadv_tt_global_entry_free_ref(tt_global);
1284 }
1285 spin_unlock_bh(list_lock);
1286 }
1287 }
1288
1289 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1290 {
1291 struct batadv_hashtable *hash;
1292 spinlock_t *list_lock; /* protects write access to the hash lists */
1293 struct batadv_tt_common_entry *tt_common_entry;
1294 struct batadv_tt_global_entry *tt_global;
1295 struct hlist_node *node_tmp;
1296 struct hlist_head *head;
1297 uint32_t i;
1298
1299 if (!bat_priv->tt.global_hash)
1300 return;
1301
1302 hash = bat_priv->tt.global_hash;
1303
1304 for (i = 0; i < hash->size; i++) {
1305 head = &hash->table[i];
1306 list_lock = &hash->list_locks[i];
1307
1308 spin_lock_bh(list_lock);
1309 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1310 head, hash_entry) {
1311 hlist_del_rcu(&tt_common_entry->hash_entry);
1312 tt_global = container_of(tt_common_entry,
1313 struct batadv_tt_global_entry,
1314 common);
1315 batadv_tt_global_entry_free_ref(tt_global);
1316 }
1317 spin_unlock_bh(list_lock);
1318 }
1319
1320 batadv_hash_destroy(hash);
1321
1322 bat_priv->tt.global_hash = NULL;
1323 }
1324
1325 static bool
1326 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1327 struct batadv_tt_global_entry *tt_global_entry)
1328 {
1329 bool ret = false;
1330
1331 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1332 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1333 ret = true;
1334
1335 return ret;
1336 }
1337
1338 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1339 const uint8_t *src,
1340 const uint8_t *addr)
1341 {
1342 struct batadv_tt_local_entry *tt_local_entry = NULL;
1343 struct batadv_tt_global_entry *tt_global_entry = NULL;
1344 struct batadv_orig_node *orig_node = NULL;
1345 struct batadv_tt_orig_list_entry *best_entry;
1346
1347 if (src && atomic_read(&bat_priv->ap_isolation)) {
1348 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src);
1349 if (!tt_local_entry ||
1350 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1351 goto out;
1352 }
1353
1354 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
1355 if (!tt_global_entry)
1356 goto out;
1357
1358 /* check whether the clients should not communicate due to AP
1359 * isolation
1360 */
1361 if (tt_local_entry &&
1362 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1363 goto out;
1364
1365 rcu_read_lock();
1366 best_entry = batadv_transtable_best_orig(tt_global_entry);
1367 /* found anything? */
1368 if (best_entry)
1369 orig_node = best_entry->orig_node;
1370 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1371 orig_node = NULL;
1372 rcu_read_unlock();
1373
1374 out:
1375 if (tt_global_entry)
1376 batadv_tt_global_entry_free_ref(tt_global_entry);
1377 if (tt_local_entry)
1378 batadv_tt_local_entry_free_ref(tt_local_entry);
1379
1380 return orig_node;
1381 }
1382
1383 /* Calculates the checksum of the local table of a given orig_node */
1384 static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1385 struct batadv_orig_node *orig_node)
1386 {
1387 uint16_t total = 0, total_one;
1388 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1389 struct batadv_tt_common_entry *tt_common;
1390 struct batadv_tt_global_entry *tt_global;
1391 struct hlist_head *head;
1392 uint32_t i;
1393 int j;
1394
1395 for (i = 0; i < hash->size; i++) {
1396 head = &hash->table[i];
1397
1398 rcu_read_lock();
1399 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1400 tt_global = container_of(tt_common,
1401 struct batadv_tt_global_entry,
1402 common);
1403 /* Roaming clients are in the global table for
1404 * consistency only. They don't have to be
1405 * taken into account while computing the
1406 * global crc
1407 */
1408 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
1409 continue;
1410 /* Temporary clients have not been announced yet, so
1411 * they have to be skipped while computing the global
1412 * crc
1413 */
1414 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
1415 continue;
1416
1417 /* find out if this global entry is announced by this
1418 * originator
1419 */
1420 if (!batadv_tt_global_entry_has_orig(tt_global,
1421 orig_node))
1422 continue;
1423
1424 total_one = 0;
1425 for (j = 0; j < ETH_ALEN; j++)
1426 total_one = crc16_byte(total_one,
1427 tt_common->addr[j]);
1428 total ^= total_one;
1429 }
1430 rcu_read_unlock();
1431 }
1432
1433 return total;
1434 }
1435
1436 /* Calculates the checksum of the local table */
1437 static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv)
1438 {
1439 uint16_t total = 0, total_one;
1440 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1441 struct batadv_tt_common_entry *tt_common;
1442 struct hlist_head *head;
1443 uint32_t i;
1444 int j;
1445
1446 for (i = 0; i < hash->size; i++) {
1447 head = &hash->table[i];
1448
1449 rcu_read_lock();
1450 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1451 /* not yet committed clients have not to be taken into
1452 * account while computing the CRC
1453 */
1454 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
1455 continue;
1456 total_one = 0;
1457 for (j = 0; j < ETH_ALEN; j++)
1458 total_one = crc16_byte(total_one,
1459 tt_common->addr[j]);
1460 total ^= total_one;
1461 }
1462 rcu_read_unlock();
1463 }
1464
1465 return total;
1466 }
1467
1468 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
1469 {
1470 struct batadv_tt_req_node *node, *safe;
1471
1472 spin_lock_bh(&bat_priv->tt.req_list_lock);
1473
1474 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1475 list_del(&node->list);
1476 kfree(node);
1477 }
1478
1479 spin_unlock_bh(&bat_priv->tt.req_list_lock);
1480 }
1481
1482 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
1483 struct batadv_orig_node *orig_node,
1484 const unsigned char *tt_buff,
1485 uint8_t tt_num_changes)
1486 {
1487 uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
1488
1489 /* Replace the old buffer only if I received something in the
1490 * last OGM (the OGM could carry no changes)
1491 */
1492 spin_lock_bh(&orig_node->tt_buff_lock);
1493 if (tt_buff_len > 0) {
1494 kfree(orig_node->tt_buff);
1495 orig_node->tt_buff_len = 0;
1496 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
1497 if (orig_node->tt_buff) {
1498 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
1499 orig_node->tt_buff_len = tt_buff_len;
1500 }
1501 }
1502 spin_unlock_bh(&orig_node->tt_buff_lock);
1503 }
1504
1505 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
1506 {
1507 struct batadv_tt_req_node *node, *safe;
1508
1509 spin_lock_bh(&bat_priv->tt.req_list_lock);
1510 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1511 if (batadv_has_timed_out(node->issued_at,
1512 BATADV_TT_REQUEST_TIMEOUT)) {
1513 list_del(&node->list);
1514 kfree(node);
1515 }
1516 }
1517 spin_unlock_bh(&bat_priv->tt.req_list_lock);
1518 }
1519
1520 /* returns the pointer to the new tt_req_node struct if no request
1521 * has already been issued for this orig_node, NULL otherwise
1522 */
1523 static struct batadv_tt_req_node *
1524 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
1525 struct batadv_orig_node *orig_node)
1526 {
1527 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
1528
1529 spin_lock_bh(&bat_priv->tt.req_list_lock);
1530 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
1531 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
1532 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
1533 BATADV_TT_REQUEST_TIMEOUT))
1534 goto unlock;
1535 }
1536
1537 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1538 if (!tt_req_node)
1539 goto unlock;
1540
1541 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1542 tt_req_node->issued_at = jiffies;
1543
1544 list_add(&tt_req_node->list, &bat_priv->tt.req_list);
1545 unlock:
1546 spin_unlock_bh(&bat_priv->tt.req_list_lock);
1547 return tt_req_node;
1548 }
1549
1550 /* data_ptr is useless here, but has to be kept to respect the prototype */
1551 static int batadv_tt_local_valid_entry(const void *entry_ptr,
1552 const void *data_ptr)
1553 {
1554 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
1555
1556 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
1557 return 0;
1558 return 1;
1559 }
1560
1561 static int batadv_tt_global_valid(const void *entry_ptr,
1562 const void *data_ptr)
1563 {
1564 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
1565 const struct batadv_tt_global_entry *tt_global_entry;
1566 const struct batadv_orig_node *orig_node = data_ptr;
1567
1568 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
1569 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
1570 return 0;
1571
1572 tt_global_entry = container_of(tt_common_entry,
1573 struct batadv_tt_global_entry,
1574 common);
1575
1576 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
1577 }
1578
1579 static struct sk_buff *
1580 batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1581 struct batadv_hashtable *hash,
1582 struct batadv_priv *bat_priv,
1583 int (*valid_cb)(const void *, const void *),
1584 void *cb_data)
1585 {
1586 struct batadv_tt_common_entry *tt_common_entry;
1587 struct batadv_tt_query_packet *tt_response;
1588 struct batadv_tt_change *tt_change;
1589 struct hlist_head *head;
1590 struct sk_buff *skb = NULL;
1591 uint16_t tt_tot, tt_count;
1592 ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet);
1593 uint32_t i;
1594 size_t len;
1595
1596 if (tt_query_size + tt_len > bat_priv->soft_iface->mtu) {
1597 tt_len = bat_priv->soft_iface->mtu - tt_query_size;
1598 tt_len -= tt_len % sizeof(struct batadv_tt_change);
1599 }
1600 tt_tot = tt_len / sizeof(struct batadv_tt_change);
1601
1602 len = tt_query_size + tt_len;
1603 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN);
1604 if (!skb)
1605 goto out;
1606
1607 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
1608 tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len);
1609 tt_response->ttvn = ttvn;
1610
1611 tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size);
1612 tt_count = 0;
1613
1614 rcu_read_lock();
1615 for (i = 0; i < hash->size; i++) {
1616 head = &hash->table[i];
1617
1618 hlist_for_each_entry_rcu(tt_common_entry,
1619 head, hash_entry) {
1620 if (tt_count == tt_tot)
1621 break;
1622
1623 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
1624 continue;
1625
1626 memcpy(tt_change->addr, tt_common_entry->addr,
1627 ETH_ALEN);
1628 tt_change->flags = tt_common_entry->flags;
1629
1630 tt_count++;
1631 tt_change++;
1632 }
1633 }
1634 rcu_read_unlock();
1635
1636 /* store in the message the number of entries we have successfully
1637 * copied
1638 */
1639 tt_response->tt_data = htons(tt_count);
1640
1641 out:
1642 return skb;
1643 }
1644
1645 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
1646 struct batadv_orig_node *dst_orig_node,
1647 uint8_t ttvn, uint16_t tt_crc,
1648 bool full_table)
1649 {
1650 struct sk_buff *skb = NULL;
1651 struct batadv_tt_query_packet *tt_request;
1652 struct batadv_hard_iface *primary_if;
1653 struct batadv_tt_req_node *tt_req_node = NULL;
1654 int ret = 1;
1655 size_t tt_req_len;
1656
1657 primary_if = batadv_primary_if_get_selected(bat_priv);
1658 if (!primary_if)
1659 goto out;
1660
1661 /* The new tt_req will be issued only if I'm not waiting for a
1662 * reply from the same orig_node yet
1663 */
1664 tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
1665 if (!tt_req_node)
1666 goto out;
1667
1668 skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN + NET_IP_ALIGN);
1669 if (!skb)
1670 goto out;
1671
1672 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
1673
1674 tt_req_len = sizeof(*tt_request);
1675 tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len);
1676
1677 tt_request->header.packet_type = BATADV_TT_QUERY;
1678 tt_request->header.version = BATADV_COMPAT_VERSION;
1679 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1680 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1681 tt_request->header.ttl = BATADV_TTL;
1682 tt_request->ttvn = ttvn;
1683 tt_request->tt_data = htons(tt_crc);
1684 tt_request->flags = BATADV_TT_REQUEST;
1685
1686 if (full_table)
1687 tt_request->flags |= BATADV_TT_FULL_TABLE;
1688
1689 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
1690 dst_orig_node->orig, (full_table ? 'F' : '.'));
1691
1692 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
1693
1694 if (batadv_send_skb_to_orig(skb, dst_orig_node, NULL))
1695 ret = 0;
1696
1697 out:
1698 if (primary_if)
1699 batadv_hardif_free_ref(primary_if);
1700 if (ret)
1701 kfree_skb(skb);
1702 if (ret && tt_req_node) {
1703 spin_lock_bh(&bat_priv->tt.req_list_lock);
1704 list_del(&tt_req_node->list);
1705 spin_unlock_bh(&bat_priv->tt.req_list_lock);
1706 kfree(tt_req_node);
1707 }
1708 return ret;
1709 }
1710
1711 static bool
1712 batadv_send_other_tt_response(struct batadv_priv *bat_priv,
1713 struct batadv_tt_query_packet *tt_request)
1714 {
1715 struct batadv_orig_node *req_dst_orig_node;
1716 struct batadv_orig_node *res_dst_orig_node = NULL;
1717 uint8_t orig_ttvn, req_ttvn, ttvn;
1718 int ret = false;
1719 unsigned char *tt_buff;
1720 bool full_table;
1721 uint16_t tt_len, tt_tot;
1722 struct sk_buff *skb = NULL;
1723 struct batadv_tt_query_packet *tt_response;
1724 uint8_t *packet_pos;
1725 size_t len;
1726
1727 batadv_dbg(BATADV_DBG_TT, bat_priv,
1728 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1729 tt_request->src, tt_request->ttvn, tt_request->dst,
1730 (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1731
1732 /* Let's get the orig node of the REAL destination */
1733 req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst);
1734 if (!req_dst_orig_node)
1735 goto out;
1736
1737 res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
1738 if (!res_dst_orig_node)
1739 goto out;
1740
1741 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1742 req_ttvn = tt_request->ttvn;
1743
1744 /* I don't have the requested data */
1745 if (orig_ttvn != req_ttvn ||
1746 tt_request->tt_data != htons(req_dst_orig_node->tt_crc))
1747 goto out;
1748
1749 /* If the full table has been explicitly requested */
1750 if (tt_request->flags & BATADV_TT_FULL_TABLE ||
1751 !req_dst_orig_node->tt_buff)
1752 full_table = true;
1753 else
1754 full_table = false;
1755
1756 /* In this version, fragmentation is not implemented, then
1757 * I'll send only one packet with as much TT entries as I can
1758 */
1759 if (!full_table) {
1760 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1761 tt_len = req_dst_orig_node->tt_buff_len;
1762 tt_tot = tt_len / sizeof(struct batadv_tt_change);
1763
1764 len = sizeof(*tt_response) + tt_len;
1765 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN);
1766 if (!skb)
1767 goto unlock;
1768
1769 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
1770 packet_pos = skb_put(skb, len);
1771 tt_response = (struct batadv_tt_query_packet *)packet_pos;
1772 tt_response->ttvn = req_ttvn;
1773 tt_response->tt_data = htons(tt_tot);
1774
1775 tt_buff = skb->data + sizeof(*tt_response);
1776 /* Copy the last orig_node's OGM buffer */
1777 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1778 req_dst_orig_node->tt_buff_len);
1779
1780 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1781 } else {
1782 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size);
1783 tt_len *= sizeof(struct batadv_tt_change);
1784 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1785
1786 skb = batadv_tt_response_fill_table(tt_len, ttvn,
1787 bat_priv->tt.global_hash,
1788 bat_priv,
1789 batadv_tt_global_valid,
1790 req_dst_orig_node);
1791 if (!skb)
1792 goto out;
1793
1794 tt_response = (struct batadv_tt_query_packet *)skb->data;
1795 }
1796
1797 tt_response->header.packet_type = BATADV_TT_QUERY;
1798 tt_response->header.version = BATADV_COMPAT_VERSION;
1799 tt_response->header.ttl = BATADV_TTL;
1800 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1801 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1802 tt_response->flags = BATADV_TT_RESPONSE;
1803
1804 if (full_table)
1805 tt_response->flags |= BATADV_TT_FULL_TABLE;
1806
1807 batadv_dbg(BATADV_DBG_TT, bat_priv,
1808 "Sending TT_RESPONSE %pM for %pM (ttvn: %u)\n",
1809 res_dst_orig_node->orig, req_dst_orig_node->orig, req_ttvn);
1810
1811 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
1812
1813 if (batadv_send_skb_to_orig(skb, res_dst_orig_node, NULL))
1814 ret = true;
1815 goto out;
1816
1817 unlock:
1818 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1819
1820 out:
1821 if (res_dst_orig_node)
1822 batadv_orig_node_free_ref(res_dst_orig_node);
1823 if (req_dst_orig_node)
1824 batadv_orig_node_free_ref(req_dst_orig_node);
1825 if (!ret)
1826 kfree_skb(skb);
1827 return ret;
1828 }
1829
1830 static bool
1831 batadv_send_my_tt_response(struct batadv_priv *bat_priv,
1832 struct batadv_tt_query_packet *tt_request)
1833 {
1834 struct batadv_orig_node *orig_node;
1835 struct batadv_hard_iface *primary_if = NULL;
1836 uint8_t my_ttvn, req_ttvn, ttvn;
1837 int ret = false;
1838 unsigned char *tt_buff;
1839 bool full_table;
1840 uint16_t tt_len, tt_tot;
1841 struct sk_buff *skb = NULL;
1842 struct batadv_tt_query_packet *tt_response;
1843 uint8_t *packet_pos;
1844 size_t len;
1845
1846 batadv_dbg(BATADV_DBG_TT, bat_priv,
1847 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1848 tt_request->src, tt_request->ttvn,
1849 (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1850
1851
1852 my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
1853 req_ttvn = tt_request->ttvn;
1854
1855 orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
1856 if (!orig_node)
1857 goto out;
1858
1859 primary_if = batadv_primary_if_get_selected(bat_priv);
1860 if (!primary_if)
1861 goto out;
1862
1863 /* If the full table has been explicitly requested or the gap
1864 * is too big send the whole local translation table
1865 */
1866 if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
1867 !bat_priv->tt.last_changeset)
1868 full_table = true;
1869 else
1870 full_table = false;
1871
1872 /* In this version, fragmentation is not implemented, then
1873 * I'll send only one packet with as much TT entries as I can
1874 */
1875 if (!full_table) {
1876 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1877 tt_len = bat_priv->tt.last_changeset_len;
1878 tt_tot = tt_len / sizeof(struct batadv_tt_change);
1879
1880 len = sizeof(*tt_response) + tt_len;
1881 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN);
1882 if (!skb)
1883 goto unlock;
1884
1885 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
1886 packet_pos = skb_put(skb, len);
1887 tt_response = (struct batadv_tt_query_packet *)packet_pos;
1888 tt_response->ttvn = req_ttvn;
1889 tt_response->tt_data = htons(tt_tot);
1890
1891 tt_buff = skb->data + sizeof(*tt_response);
1892 memcpy(tt_buff, bat_priv->tt.last_changeset,
1893 bat_priv->tt.last_changeset_len);
1894 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1895 } else {
1896 tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num);
1897 tt_len *= sizeof(struct batadv_tt_change);
1898 ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
1899
1900 skb = batadv_tt_response_fill_table(tt_len, ttvn,
1901 bat_priv->tt.local_hash,
1902 bat_priv,
1903 batadv_tt_local_valid_entry,
1904 NULL);
1905 if (!skb)
1906 goto out;
1907
1908 tt_response = (struct batadv_tt_query_packet *)skb->data;
1909 }
1910
1911 tt_response->header.packet_type = BATADV_TT_QUERY;
1912 tt_response->header.version = BATADV_COMPAT_VERSION;
1913 tt_response->header.ttl = BATADV_TTL;
1914 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1915 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1916 tt_response->flags = BATADV_TT_RESPONSE;
1917
1918 if (full_table)
1919 tt_response->flags |= BATADV_TT_FULL_TABLE;
1920
1921 batadv_dbg(BATADV_DBG_TT, bat_priv,
1922 "Sending TT_RESPONSE to %pM [%c]\n",
1923 orig_node->orig,
1924 (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1925
1926 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
1927
1928 if (batadv_send_skb_to_orig(skb, orig_node, NULL))
1929 ret = true;
1930 goto out;
1931
1932 unlock:
1933 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1934 out:
1935 if (orig_node)
1936 batadv_orig_node_free_ref(orig_node);
1937 if (primary_if)
1938 batadv_hardif_free_ref(primary_if);
1939 if (!ret)
1940 kfree_skb(skb);
1941 /* This packet was for me, so it doesn't need to be re-routed */
1942 return true;
1943 }
1944
1945 bool batadv_send_tt_response(struct batadv_priv *bat_priv,
1946 struct batadv_tt_query_packet *tt_request)
1947 {
1948 if (batadv_is_my_mac(bat_priv, tt_request->dst)) {
1949 /* don't answer backbone gws! */
1950 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src))
1951 return true;
1952
1953 return batadv_send_my_tt_response(bat_priv, tt_request);
1954 } else {
1955 return batadv_send_other_tt_response(bat_priv, tt_request);
1956 }
1957 }
1958
1959 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
1960 struct batadv_orig_node *orig_node,
1961 struct batadv_tt_change *tt_change,
1962 uint16_t tt_num_changes, uint8_t ttvn)
1963 {
1964 int i;
1965 int roams;
1966
1967 for (i = 0; i < tt_num_changes; i++) {
1968 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
1969 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
1970 batadv_tt_global_del(bat_priv, orig_node,
1971 (tt_change + i)->addr,
1972 "tt removed by changes",
1973 roams);
1974 } else {
1975 if (!batadv_tt_global_add(bat_priv, orig_node,
1976 (tt_change + i)->addr,
1977 (tt_change + i)->flags, ttvn))
1978 /* In case of problem while storing a
1979 * global_entry, we stop the updating
1980 * procedure without committing the
1981 * ttvn change. This will avoid to send
1982 * corrupted data on tt_request
1983 */
1984 return;
1985 }
1986 }
1987 orig_node->tt_initialised = true;
1988 }
1989
1990 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
1991 struct batadv_tt_query_packet *tt_response)
1992 {
1993 struct batadv_orig_node *orig_node;
1994
1995 orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
1996 if (!orig_node)
1997 goto out;
1998
1999 /* Purge the old table first.. */
2000 batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table");
2001
2002 _batadv_tt_update_changes(bat_priv, orig_node,
2003 (struct batadv_tt_change *)(tt_response + 1),
2004 ntohs(tt_response->tt_data),
2005 tt_response->ttvn);
2006
2007 spin_lock_bh(&orig_node->tt_buff_lock);
2008 kfree(orig_node->tt_buff);
2009 orig_node->tt_buff_len = 0;
2010 orig_node->tt_buff = NULL;
2011 spin_unlock_bh(&orig_node->tt_buff_lock);
2012
2013 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
2014
2015 out:
2016 if (orig_node)
2017 batadv_orig_node_free_ref(orig_node);
2018 }
2019
2020 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2021 struct batadv_orig_node *orig_node,
2022 uint16_t tt_num_changes, uint8_t ttvn,
2023 struct batadv_tt_change *tt_change)
2024 {
2025 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2026 tt_num_changes, ttvn);
2027
2028 batadv_tt_save_orig_buffer(bat_priv, orig_node,
2029 (unsigned char *)tt_change, tt_num_changes);
2030 atomic_set(&orig_node->last_ttvn, ttvn);
2031 }
2032
2033 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr)
2034 {
2035 struct batadv_tt_local_entry *tt_local_entry;
2036 bool ret = false;
2037
2038 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
2039 if (!tt_local_entry)
2040 goto out;
2041 /* Check if the client has been logically deleted (but is kept for
2042 * consistency purpose)
2043 */
2044 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2045 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2046 goto out;
2047 ret = true;
2048 out:
2049 if (tt_local_entry)
2050 batadv_tt_local_entry_free_ref(tt_local_entry);
2051 return ret;
2052 }
2053
2054 void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2055 struct batadv_tt_query_packet *tt_response)
2056 {
2057 struct batadv_tt_req_node *node, *safe;
2058 struct batadv_orig_node *orig_node = NULL;
2059 struct batadv_tt_change *tt_change;
2060
2061 batadv_dbg(BATADV_DBG_TT, bat_priv,
2062 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2063 tt_response->src, tt_response->ttvn,
2064 ntohs(tt_response->tt_data),
2065 (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2066
2067 /* we should have never asked a backbone gw */
2068 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src))
2069 goto out;
2070
2071 orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
2072 if (!orig_node)
2073 goto out;
2074
2075 if (tt_response->flags & BATADV_TT_FULL_TABLE) {
2076 batadv_tt_fill_gtable(bat_priv, tt_response);
2077 } else {
2078 tt_change = (struct batadv_tt_change *)(tt_response + 1);
2079 batadv_tt_update_changes(bat_priv, orig_node,
2080 ntohs(tt_response->tt_data),
2081 tt_response->ttvn, tt_change);
2082 }
2083
2084 /* Delete the tt_req_node from pending tt_requests list */
2085 spin_lock_bh(&bat_priv->tt.req_list_lock);
2086 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2087 if (!batadv_compare_eth(node->addr, tt_response->src))
2088 continue;
2089 list_del(&node->list);
2090 kfree(node);
2091 }
2092 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2093
2094 /* Recalculate the CRC for this orig_node and store it */
2095 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
2096 out:
2097 if (orig_node)
2098 batadv_orig_node_free_ref(orig_node);
2099 }
2100
2101 int batadv_tt_init(struct batadv_priv *bat_priv)
2102 {
2103 int ret;
2104
2105 ret = batadv_tt_local_init(bat_priv);
2106 if (ret < 0)
2107 return ret;
2108
2109 ret = batadv_tt_global_init(bat_priv);
2110 if (ret < 0)
2111 return ret;
2112
2113 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
2114 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
2115 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
2116
2117 return 1;
2118 }
2119
2120 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2121 {
2122 struct batadv_tt_roam_node *node, *safe;
2123
2124 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2125
2126 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2127 list_del(&node->list);
2128 kfree(node);
2129 }
2130
2131 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2132 }
2133
2134 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2135 {
2136 struct batadv_tt_roam_node *node, *safe;
2137
2138 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2139 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2140 if (!batadv_has_timed_out(node->first_time,
2141 BATADV_ROAMING_MAX_TIME))
2142 continue;
2143
2144 list_del(&node->list);
2145 kfree(node);
2146 }
2147 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2148 }
2149
2150 /* This function checks whether the client already reached the
2151 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2152 * will not be sent.
2153 *
2154 * returns true if the ROAMING_ADV can be sent, false otherwise
2155 */
2156 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2157 uint8_t *client)
2158 {
2159 struct batadv_tt_roam_node *tt_roam_node;
2160 bool ret = false;
2161
2162 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2163 /* The new tt_req will be issued only if I'm not waiting for a
2164 * reply from the same orig_node yet
2165 */
2166 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2167 if (!batadv_compare_eth(tt_roam_node->addr, client))
2168 continue;
2169
2170 if (batadv_has_timed_out(tt_roam_node->first_time,
2171 BATADV_ROAMING_MAX_TIME))
2172 continue;
2173
2174 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2175 /* Sorry, you roamed too many times! */
2176 goto unlock;
2177 ret = true;
2178 break;
2179 }
2180
2181 if (!ret) {
2182 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2183 if (!tt_roam_node)
2184 goto unlock;
2185
2186 tt_roam_node->first_time = jiffies;
2187 atomic_set(&tt_roam_node->counter,
2188 BATADV_ROAMING_MAX_COUNT - 1);
2189 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2190
2191 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2192 ret = true;
2193 }
2194
2195 unlock:
2196 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2197 return ret;
2198 }
2199
2200 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2201 struct batadv_orig_node *orig_node)
2202 {
2203 struct sk_buff *skb = NULL;
2204 struct batadv_roam_adv_packet *roam_adv_packet;
2205 int ret = 1;
2206 struct batadv_hard_iface *primary_if;
2207 size_t len = sizeof(*roam_adv_packet);
2208
2209 /* before going on we have to check whether the client has
2210 * already roamed to us too many times
2211 */
2212 if (!batadv_tt_check_roam_count(bat_priv, client))
2213 goto out;
2214
2215 skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN + NET_IP_ALIGN);
2216 if (!skb)
2217 goto out;
2218
2219 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN);
2220
2221 roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len);
2222
2223 roam_adv_packet->header.packet_type = BATADV_ROAM_ADV;
2224 roam_adv_packet->header.version = BATADV_COMPAT_VERSION;
2225 roam_adv_packet->header.ttl = BATADV_TTL;
2226 roam_adv_packet->reserved = 0;
2227 primary_if = batadv_primary_if_get_selected(bat_priv);
2228 if (!primary_if)
2229 goto out;
2230 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
2231 batadv_hardif_free_ref(primary_if);
2232 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
2233 memcpy(roam_adv_packet->client, client, ETH_ALEN);
2234
2235 batadv_dbg(BATADV_DBG_TT, bat_priv,
2236 "Sending ROAMING_ADV to %pM (client %pM)\n",
2237 orig_node->orig, client);
2238
2239 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2240
2241 if (batadv_send_skb_to_orig(skb, orig_node, NULL))
2242 ret = 0;
2243
2244 out:
2245 if (ret && skb)
2246 kfree_skb(skb);
2247 return;
2248 }
2249
2250 static void batadv_tt_purge(struct work_struct *work)
2251 {
2252 struct delayed_work *delayed_work;
2253 struct batadv_priv_tt *priv_tt;
2254 struct batadv_priv *bat_priv;
2255
2256 delayed_work = container_of(work, struct delayed_work, work);
2257 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2258 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2259
2260 batadv_tt_local_purge(bat_priv);
2261 batadv_tt_global_purge(bat_priv);
2262 batadv_tt_req_purge(bat_priv);
2263 batadv_tt_roam_purge(bat_priv);
2264
2265 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
2266 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
2267 }
2268
2269 void batadv_tt_free(struct batadv_priv *bat_priv)
2270 {
2271 cancel_delayed_work_sync(&bat_priv->tt.work);
2272
2273 batadv_tt_local_table_free(bat_priv);
2274 batadv_tt_global_table_free(bat_priv);
2275 batadv_tt_req_list_free(bat_priv);
2276 batadv_tt_changes_list_free(bat_priv);
2277 batadv_tt_roam_list_free(bat_priv);
2278
2279 kfree(bat_priv->tt.last_changeset);
2280 }
2281
2282 /* This function will enable or disable the specified flags for all the entries
2283 * in the given hash table and returns the number of modified entries
2284 */
2285 static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash,
2286 uint16_t flags, bool enable)
2287 {
2288 uint32_t i;
2289 uint16_t changed_num = 0;
2290 struct hlist_head *head;
2291 struct batadv_tt_common_entry *tt_common_entry;
2292
2293 if (!hash)
2294 goto out;
2295
2296 for (i = 0; i < hash->size; i++) {
2297 head = &hash->table[i];
2298
2299 rcu_read_lock();
2300 hlist_for_each_entry_rcu(tt_common_entry,
2301 head, hash_entry) {
2302 if (enable) {
2303 if ((tt_common_entry->flags & flags) == flags)
2304 continue;
2305 tt_common_entry->flags |= flags;
2306 } else {
2307 if (!(tt_common_entry->flags & flags))
2308 continue;
2309 tt_common_entry->flags &= ~flags;
2310 }
2311 changed_num++;
2312 }
2313 rcu_read_unlock();
2314 }
2315 out:
2316 return changed_num;
2317 }
2318
2319 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
2320 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
2321 {
2322 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2323 struct batadv_tt_common_entry *tt_common;
2324 struct batadv_tt_local_entry *tt_local;
2325 struct hlist_node *node_tmp;
2326 struct hlist_head *head;
2327 spinlock_t *list_lock; /* protects write access to the hash lists */
2328 uint32_t i;
2329
2330 if (!hash)
2331 return;
2332
2333 for (i = 0; i < hash->size; i++) {
2334 head = &hash->table[i];
2335 list_lock = &hash->list_locks[i];
2336
2337 spin_lock_bh(list_lock);
2338 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2339 hash_entry) {
2340 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
2341 continue;
2342
2343 batadv_dbg(BATADV_DBG_TT, bat_priv,
2344 "Deleting local tt entry (%pM): pending\n",
2345 tt_common->addr);
2346
2347 atomic_dec(&bat_priv->tt.local_entry_num);
2348 hlist_del_rcu(&tt_common->hash_entry);
2349 tt_local = container_of(tt_common,
2350 struct batadv_tt_local_entry,
2351 common);
2352 batadv_tt_local_entry_free_ref(tt_local);
2353 }
2354 spin_unlock_bh(list_lock);
2355 }
2356 }
2357
2358 static int batadv_tt_commit_changes(struct batadv_priv *bat_priv,
2359 unsigned char **packet_buff,
2360 int *packet_buff_len, int packet_min_len)
2361 {
2362 uint16_t changed_num = 0;
2363
2364 if (atomic_read(&bat_priv->tt.local_changes) < 1)
2365 return -ENOENT;
2366
2367 changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash,
2368 BATADV_TT_CLIENT_NEW, false);
2369
2370 /* all reset entries have to be counted as local entries */
2371 atomic_add(changed_num, &bat_priv->tt.local_entry_num);
2372 batadv_tt_local_purge_pending_clients(bat_priv);
2373 bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv);
2374
2375 /* Increment the TTVN only once per OGM interval */
2376 atomic_inc(&bat_priv->tt.vn);
2377 batadv_dbg(BATADV_DBG_TT, bat_priv,
2378 "Local changes committed, updating to ttvn %u\n",
2379 (uint8_t)atomic_read(&bat_priv->tt.vn));
2380
2381 /* reset the sending counter */
2382 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
2383
2384 return batadv_tt_changes_fill_buff(bat_priv, packet_buff,
2385 packet_buff_len, packet_min_len);
2386 }
2387
2388 /* when calling this function (hard_iface == primary_if) has to be true */
2389 int batadv_tt_append_diff(struct batadv_priv *bat_priv,
2390 unsigned char **packet_buff, int *packet_buff_len,
2391 int packet_min_len)
2392 {
2393 int tt_num_changes;
2394
2395 /* if at least one change happened */
2396 tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff,
2397 packet_buff_len,
2398 packet_min_len);
2399
2400 /* if the changes have been sent often enough */
2401 if ((tt_num_changes < 0) &&
2402 (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) {
2403 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
2404 packet_min_len, packet_min_len);
2405 tt_num_changes = 0;
2406 }
2407
2408 return tt_num_changes;
2409 }
2410
2411 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
2412 uint8_t *dst)
2413 {
2414 struct batadv_tt_local_entry *tt_local_entry = NULL;
2415 struct batadv_tt_global_entry *tt_global_entry = NULL;
2416 bool ret = false;
2417
2418 if (!atomic_read(&bat_priv->ap_isolation))
2419 goto out;
2420
2421 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst);
2422 if (!tt_local_entry)
2423 goto out;
2424
2425 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src);
2426 if (!tt_global_entry)
2427 goto out;
2428
2429 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2430 goto out;
2431
2432 ret = true;
2433
2434 out:
2435 if (tt_global_entry)
2436 batadv_tt_global_entry_free_ref(tt_global_entry);
2437 if (tt_local_entry)
2438 batadv_tt_local_entry_free_ref(tt_local_entry);
2439 return ret;
2440 }
2441
2442 void batadv_tt_update_orig(struct batadv_priv *bat_priv,
2443 struct batadv_orig_node *orig_node,
2444 const unsigned char *tt_buff, uint8_t tt_num_changes,
2445 uint8_t ttvn, uint16_t tt_crc)
2446 {
2447 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
2448 bool full_table = true;
2449 struct batadv_tt_change *tt_change;
2450
2451 /* don't care about a backbone gateways updates. */
2452 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2453 return;
2454
2455 /* orig table not initialised AND first diff is in the OGM OR the ttvn
2456 * increased by one -> we can apply the attached changes
2457 */
2458 if ((!orig_node->tt_initialised && ttvn == 1) ||
2459 ttvn - orig_ttvn == 1) {
2460 /* the OGM could not contain the changes due to their size or
2461 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
2462 * times.
2463 * In this case send a tt request
2464 */
2465 if (!tt_num_changes) {
2466 full_table = false;
2467 goto request_table;
2468 }
2469
2470 tt_change = (struct batadv_tt_change *)tt_buff;
2471 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
2472 ttvn, tt_change);
2473
2474 /* Even if we received the precomputed crc with the OGM, we
2475 * prefer to recompute it to spot any possible inconsistency
2476 * in the global table
2477 */
2478 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
2479
2480 /* The ttvn alone is not enough to guarantee consistency
2481 * because a single value could represent different states
2482 * (due to the wrap around). Thus a node has to check whether
2483 * the resulting table (after applying the changes) is still
2484 * consistent or not. E.g. a node could disconnect while its
2485 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2486 * checking the CRC value is mandatory to detect the
2487 * inconsistency
2488 */
2489 if (orig_node->tt_crc != tt_crc)
2490 goto request_table;
2491 } else {
2492 /* if we missed more than one change or our tables are not
2493 * in sync anymore -> request fresh tt data
2494 */
2495 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
2496 orig_node->tt_crc != tt_crc) {
2497 request_table:
2498 batadv_dbg(BATADV_DBG_TT, bat_priv,
2499 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %#.4x last_crc: %#.4x num_changes: %u)\n",
2500 orig_node->orig, ttvn, orig_ttvn, tt_crc,
2501 orig_node->tt_crc, tt_num_changes);
2502 batadv_send_tt_request(bat_priv, orig_node, ttvn,
2503 tt_crc, full_table);
2504 return;
2505 }
2506 }
2507 }
2508
2509 /* returns true whether we know that the client has moved from its old
2510 * originator to another one. This entry is kept is still kept for consistency
2511 * purposes
2512 */
2513 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
2514 uint8_t *addr)
2515 {
2516 struct batadv_tt_global_entry *tt_global_entry;
2517 bool ret = false;
2518
2519 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
2520 if (!tt_global_entry)
2521 goto out;
2522
2523 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
2524 batadv_tt_global_entry_free_ref(tt_global_entry);
2525 out:
2526 return ret;
2527 }
2528
2529 /**
2530 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
2531 * @bat_priv: the bat priv with all the soft interface information
2532 * @addr: the MAC address of the local client to query
2533 *
2534 * Returns true if the local client is known to be roaming (it is not served by
2535 * this node anymore) or not. If yes, the client is still present in the table
2536 * to keep the latter consistent with the node TTVN
2537 */
2538 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
2539 uint8_t *addr)
2540 {
2541 struct batadv_tt_local_entry *tt_local_entry;
2542 bool ret = false;
2543
2544 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
2545 if (!tt_local_entry)
2546 goto out;
2547
2548 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
2549 batadv_tt_local_entry_free_ref(tt_local_entry);
2550 out:
2551 return ret;
2552 }
2553
2554 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
2555 struct batadv_orig_node *orig_node,
2556 const unsigned char *addr)
2557 {
2558 bool ret = false;
2559
2560 /* if the originator is a backbone node (meaning it belongs to the same
2561 * LAN of this node) the temporary client must not be added because to
2562 * reach such destination the node must use the LAN instead of the mesh
2563 */
2564 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2565 goto out;
2566
2567 if (!batadv_tt_global_add(bat_priv, orig_node, addr,
2568 BATADV_TT_CLIENT_TEMP,
2569 atomic_read(&orig_node->last_ttvn)))
2570 goto out;
2571
2572 batadv_dbg(BATADV_DBG_TT, bat_priv,
2573 "Added temporary global client (addr: %pM orig: %pM)\n",
2574 addr, orig_node->orig);
2575 ret = true;
2576 out:
2577 return ret;
2578 }
Linus' kernel tree