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