2 * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "translation-table.h"
24 #include "soft-interface.h"
25 #include "hard-interface.h"
28 #include "originator.h"
30 #include "bridge_loop_avoidance.h"
32 #include <linux/crc16.h>
34 static void send_roam_adv(struct bat_priv
*bat_priv
, uint8_t *client
,
35 struct orig_node
*orig_node
);
36 static void tt_purge(struct work_struct
*work
);
37 static void tt_global_del_orig_list(struct tt_global_entry
*tt_global_entry
);
39 /* returns 1 if they are the same mac addr */
40 static int compare_tt(const struct hlist_node
*node
, const void *data2
)
42 const void *data1
= container_of(node
, struct tt_common_entry
,
45 return (memcmp(data1
, data2
, ETH_ALEN
) == 0 ? 1 : 0);
48 static void tt_start_timer(struct bat_priv
*bat_priv
)
50 INIT_DELAYED_WORK(&bat_priv
->tt_work
, tt_purge
);
51 queue_delayed_work(bat_event_workqueue
, &bat_priv
->tt_work
,
52 msecs_to_jiffies(5000));
55 static struct tt_common_entry
*tt_hash_find(struct hashtable_t
*hash
,
58 struct hlist_head
*head
;
59 struct hlist_node
*node
;
60 struct tt_common_entry
*tt_common_entry
, *tt_common_entry_tmp
= NULL
;
66 index
= choose_orig(data
, hash
->size
);
67 head
= &hash
->table
[index
];
70 hlist_for_each_entry_rcu(tt_common_entry
, node
, head
, hash_entry
) {
71 if (!compare_eth(tt_common_entry
, data
))
74 if (!atomic_inc_not_zero(&tt_common_entry
->refcount
))
77 tt_common_entry_tmp
= tt_common_entry
;
82 return tt_common_entry_tmp
;
85 static struct tt_local_entry
*tt_local_hash_find(struct bat_priv
*bat_priv
,
88 struct tt_common_entry
*tt_common_entry
;
89 struct tt_local_entry
*tt_local_entry
= NULL
;
91 tt_common_entry
= tt_hash_find(bat_priv
->tt_local_hash
, data
);
93 tt_local_entry
= container_of(tt_common_entry
,
94 struct tt_local_entry
, common
);
95 return tt_local_entry
;
98 static struct tt_global_entry
*tt_global_hash_find(struct bat_priv
*bat_priv
,
101 struct tt_common_entry
*tt_common_entry
;
102 struct tt_global_entry
*tt_global_entry
= NULL
;
104 tt_common_entry
= tt_hash_find(bat_priv
->tt_global_hash
, data
);
106 tt_global_entry
= container_of(tt_common_entry
,
107 struct tt_global_entry
, common
);
108 return tt_global_entry
;
112 static void tt_local_entry_free_ref(struct tt_local_entry
*tt_local_entry
)
114 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
115 kfree_rcu(tt_local_entry
, common
.rcu
);
118 static void tt_global_entry_free_rcu(struct rcu_head
*rcu
)
120 struct tt_common_entry
*tt_common_entry
;
121 struct tt_global_entry
*tt_global_entry
;
123 tt_common_entry
= container_of(rcu
, struct tt_common_entry
, rcu
);
124 tt_global_entry
= container_of(tt_common_entry
, struct tt_global_entry
,
127 kfree(tt_global_entry
);
130 static void tt_global_entry_free_ref(struct tt_global_entry
*tt_global_entry
)
132 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
133 tt_global_del_orig_list(tt_global_entry
);
134 call_rcu(&tt_global_entry
->common
.rcu
,
135 tt_global_entry_free_rcu
);
139 static void tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
141 struct tt_orig_list_entry
*orig_entry
;
143 orig_entry
= container_of(rcu
, struct tt_orig_list_entry
, rcu
);
144 atomic_dec(&orig_entry
->orig_node
->tt_size
);
145 batadv_orig_node_free_ref(orig_entry
->orig_node
);
149 static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry
*orig_entry
)
151 call_rcu(&orig_entry
->rcu
, tt_orig_list_entry_free_rcu
);
154 static void tt_local_event(struct bat_priv
*bat_priv
, const uint8_t *addr
,
157 struct tt_change_node
*tt_change_node
;
159 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
164 tt_change_node
->change
.flags
= flags
;
165 memcpy(tt_change_node
->change
.addr
, addr
, ETH_ALEN
);
167 spin_lock_bh(&bat_priv
->tt_changes_list_lock
);
168 /* track the change in the OGMinterval list */
169 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt_changes_list
);
170 atomic_inc(&bat_priv
->tt_local_changes
);
171 spin_unlock_bh(&bat_priv
->tt_changes_list_lock
);
173 atomic_set(&bat_priv
->tt_ogm_append_cnt
, 0);
176 int tt_len(int changes_num
)
178 return changes_num
* sizeof(struct tt_change
);
181 static int tt_local_init(struct bat_priv
*bat_priv
)
183 if (bat_priv
->tt_local_hash
)
186 bat_priv
->tt_local_hash
= batadv_hash_new(1024);
188 if (!bat_priv
->tt_local_hash
)
194 void tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
197 struct bat_priv
*bat_priv
= netdev_priv(soft_iface
);
198 struct tt_local_entry
*tt_local_entry
= NULL
;
199 struct tt_global_entry
*tt_global_entry
= NULL
;
200 struct hlist_head
*head
;
201 struct hlist_node
*node
;
202 struct tt_orig_list_entry
*orig_entry
;
205 tt_local_entry
= tt_local_hash_find(bat_priv
, addr
);
207 if (tt_local_entry
) {
208 tt_local_entry
->last_seen
= jiffies
;
209 /* possibly unset the TT_CLIENT_PENDING flag */
210 tt_local_entry
->common
.flags
&= ~TT_CLIENT_PENDING
;
214 tt_local_entry
= kmalloc(sizeof(*tt_local_entry
), GFP_ATOMIC
);
218 bat_dbg(DBG_TT
, bat_priv
,
219 "Creating new local tt entry: %pM (ttvn: %d)\n", addr
,
220 (uint8_t)atomic_read(&bat_priv
->ttvn
));
222 memcpy(tt_local_entry
->common
.addr
, addr
, ETH_ALEN
);
223 tt_local_entry
->common
.flags
= NO_FLAGS
;
224 if (batadv_is_wifi_iface(ifindex
))
225 tt_local_entry
->common
.flags
|= TT_CLIENT_WIFI
;
226 atomic_set(&tt_local_entry
->common
.refcount
, 2);
227 tt_local_entry
->last_seen
= jiffies
;
229 /* the batman interface mac address should never be purged */
230 if (compare_eth(addr
, soft_iface
->dev_addr
))
231 tt_local_entry
->common
.flags
|= TT_CLIENT_NOPURGE
;
233 /* The local entry has to be marked as NEW to avoid to send it in
234 * a full table response going out before the next ttvn increment
235 * (consistency check) */
236 tt_local_entry
->common
.flags
|= TT_CLIENT_NEW
;
238 hash_added
= hash_add(bat_priv
->tt_local_hash
, compare_tt
, choose_orig
,
239 &tt_local_entry
->common
,
240 &tt_local_entry
->common
.hash_entry
);
242 if (unlikely(hash_added
!= 0)) {
243 /* remove the reference for the hash */
244 tt_local_entry_free_ref(tt_local_entry
);
248 tt_local_event(bat_priv
, addr
, tt_local_entry
->common
.flags
);
250 /* remove address from global hash if present */
251 tt_global_entry
= tt_global_hash_find(bat_priv
, addr
);
253 /* Check whether it is a roaming! */
254 if (tt_global_entry
) {
255 /* These node are probably going to update their tt table */
256 head
= &tt_global_entry
->orig_list
;
258 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
259 orig_entry
->orig_node
->tt_poss_change
= true;
261 send_roam_adv(bat_priv
, tt_global_entry
->common
.addr
,
262 orig_entry
->orig_node
);
265 /* The global entry has to be marked as ROAMING and
266 * has to be kept for consistency purpose
268 tt_global_entry
->common
.flags
|= TT_CLIENT_ROAM
;
269 tt_global_entry
->roam_at
= jiffies
;
273 tt_local_entry_free_ref(tt_local_entry
);
275 tt_global_entry_free_ref(tt_global_entry
);
278 static void tt_realloc_packet_buff(unsigned char **packet_buff
,
279 int *packet_buff_len
, int min_packet_len
,
282 unsigned char *new_buff
;
284 new_buff
= kmalloc(new_packet_len
, GFP_ATOMIC
);
286 /* keep old buffer if kmalloc should fail */
288 memcpy(new_buff
, *packet_buff
, min_packet_len
);
290 *packet_buff
= new_buff
;
291 *packet_buff_len
= new_packet_len
;
295 static void tt_prepare_packet_buff(struct bat_priv
*bat_priv
,
296 unsigned char **packet_buff
,
297 int *packet_buff_len
, int min_packet_len
)
299 struct hard_iface
*primary_if
;
302 primary_if
= primary_if_get_selected(bat_priv
);
304 req_len
= min_packet_len
;
305 req_len
+= tt_len(atomic_read(&bat_priv
->tt_local_changes
));
307 /* if we have too many changes for one packet don't send any
308 * and wait for the tt table request which will be fragmented
310 if ((!primary_if
) || (req_len
> primary_if
->soft_iface
->mtu
))
311 req_len
= min_packet_len
;
313 tt_realloc_packet_buff(packet_buff
, packet_buff_len
,
314 min_packet_len
, req_len
);
317 hardif_free_ref(primary_if
);
320 static int tt_changes_fill_buff(struct bat_priv
*bat_priv
,
321 unsigned char **packet_buff
,
322 int *packet_buff_len
, int min_packet_len
)
324 struct tt_change_node
*entry
, *safe
;
325 int count
= 0, tot_changes
= 0, new_len
;
326 unsigned char *tt_buff
;
328 tt_prepare_packet_buff(bat_priv
, packet_buff
,
329 packet_buff_len
, min_packet_len
);
331 new_len
= *packet_buff_len
- min_packet_len
;
332 tt_buff
= *packet_buff
+ min_packet_len
;
335 tot_changes
= new_len
/ tt_len(1);
337 spin_lock_bh(&bat_priv
->tt_changes_list_lock
);
338 atomic_set(&bat_priv
->tt_local_changes
, 0);
340 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt_changes_list
,
342 if (count
< tot_changes
) {
343 memcpy(tt_buff
+ tt_len(count
),
344 &entry
->change
, sizeof(struct tt_change
));
347 list_del(&entry
->list
);
350 spin_unlock_bh(&bat_priv
->tt_changes_list_lock
);
352 /* Keep the buffer for possible tt_request */
353 spin_lock_bh(&bat_priv
->tt_buff_lock
);
354 kfree(bat_priv
->tt_buff
);
355 bat_priv
->tt_buff_len
= 0;
356 bat_priv
->tt_buff
= NULL
;
357 /* check whether this new OGM has no changes due to size problems */
359 /* if kmalloc() fails we will reply with the full table
360 * instead of providing the diff
362 bat_priv
->tt_buff
= kmalloc(new_len
, GFP_ATOMIC
);
363 if (bat_priv
->tt_buff
) {
364 memcpy(bat_priv
->tt_buff
, tt_buff
, new_len
);
365 bat_priv
->tt_buff_len
= new_len
;
368 spin_unlock_bh(&bat_priv
->tt_buff_lock
);
373 int tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
375 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
376 struct bat_priv
*bat_priv
= netdev_priv(net_dev
);
377 struct hashtable_t
*hash
= bat_priv
->tt_local_hash
;
378 struct tt_common_entry
*tt_common_entry
;
379 struct hard_iface
*primary_if
;
380 struct hlist_node
*node
;
381 struct hlist_head
*head
;
385 primary_if
= primary_if_get_selected(bat_priv
);
387 ret
= seq_printf(seq
,
388 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
393 if (primary_if
->if_status
!= IF_ACTIVE
) {
394 ret
= seq_printf(seq
,
395 "BATMAN mesh %s disabled - primary interface not active\n",
401 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
402 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->ttvn
));
404 for (i
= 0; i
< hash
->size
; i
++) {
405 head
= &hash
->table
[i
];
408 hlist_for_each_entry_rcu(tt_common_entry
, node
,
410 seq_printf(seq
, " * %pM [%c%c%c%c%c]\n",
411 tt_common_entry
->addr
,
412 (tt_common_entry
->flags
&
413 TT_CLIENT_ROAM
? 'R' : '.'),
414 (tt_common_entry
->flags
&
415 TT_CLIENT_NOPURGE
? 'P' : '.'),
416 (tt_common_entry
->flags
&
417 TT_CLIENT_NEW
? 'N' : '.'),
418 (tt_common_entry
->flags
&
419 TT_CLIENT_PENDING
? 'X' : '.'),
420 (tt_common_entry
->flags
&
421 TT_CLIENT_WIFI
? 'W' : '.'));
427 hardif_free_ref(primary_if
);
431 static void tt_local_set_pending(struct bat_priv
*bat_priv
,
432 struct tt_local_entry
*tt_local_entry
,
433 uint16_t flags
, const char *message
)
435 tt_local_event(bat_priv
, tt_local_entry
->common
.addr
,
436 tt_local_entry
->common
.flags
| flags
);
438 /* The local client has to be marked as "pending to be removed" but has
439 * to be kept in the table in order to send it in a full table
440 * response issued before the net ttvn increment (consistency check) */
441 tt_local_entry
->common
.flags
|= TT_CLIENT_PENDING
;
443 bat_dbg(DBG_TT
, bat_priv
,
444 "Local tt entry (%pM) pending to be removed: %s\n",
445 tt_local_entry
->common
.addr
, message
);
448 void tt_local_remove(struct bat_priv
*bat_priv
, const uint8_t *addr
,
449 const char *message
, bool roaming
)
451 struct tt_local_entry
*tt_local_entry
= NULL
;
453 tt_local_entry
= tt_local_hash_find(bat_priv
, addr
);
457 tt_local_set_pending(bat_priv
, tt_local_entry
, TT_CLIENT_DEL
|
458 (roaming
? TT_CLIENT_ROAM
: NO_FLAGS
), message
);
461 tt_local_entry_free_ref(tt_local_entry
);
464 static void tt_local_purge(struct bat_priv
*bat_priv
)
466 struct hashtable_t
*hash
= bat_priv
->tt_local_hash
;
467 struct tt_local_entry
*tt_local_entry
;
468 struct tt_common_entry
*tt_common_entry
;
469 struct hlist_node
*node
, *node_tmp
;
470 struct hlist_head
*head
;
471 spinlock_t
*list_lock
; /* protects write access to the hash lists */
474 for (i
= 0; i
< hash
->size
; i
++) {
475 head
= &hash
->table
[i
];
476 list_lock
= &hash
->list_locks
[i
];
478 spin_lock_bh(list_lock
);
479 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
,
481 tt_local_entry
= container_of(tt_common_entry
,
482 struct tt_local_entry
,
484 if (tt_local_entry
->common
.flags
& TT_CLIENT_NOPURGE
)
487 /* entry already marked for deletion */
488 if (tt_local_entry
->common
.flags
& TT_CLIENT_PENDING
)
491 if (!has_timed_out(tt_local_entry
->last_seen
,
495 tt_local_set_pending(bat_priv
, tt_local_entry
,
496 TT_CLIENT_DEL
, "timed out");
498 spin_unlock_bh(list_lock
);
503 static void tt_local_table_free(struct bat_priv
*bat_priv
)
505 struct hashtable_t
*hash
;
506 spinlock_t
*list_lock
; /* protects write access to the hash lists */
507 struct tt_common_entry
*tt_common_entry
;
508 struct tt_local_entry
*tt_local_entry
;
509 struct hlist_node
*node
, *node_tmp
;
510 struct hlist_head
*head
;
513 if (!bat_priv
->tt_local_hash
)
516 hash
= bat_priv
->tt_local_hash
;
518 for (i
= 0; i
< hash
->size
; i
++) {
519 head
= &hash
->table
[i
];
520 list_lock
= &hash
->list_locks
[i
];
522 spin_lock_bh(list_lock
);
523 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
,
526 tt_local_entry
= container_of(tt_common_entry
,
527 struct tt_local_entry
,
529 tt_local_entry_free_ref(tt_local_entry
);
531 spin_unlock_bh(list_lock
);
534 batadv_hash_destroy(hash
);
536 bat_priv
->tt_local_hash
= NULL
;
539 static int tt_global_init(struct bat_priv
*bat_priv
)
541 if (bat_priv
->tt_global_hash
)
544 bat_priv
->tt_global_hash
= batadv_hash_new(1024);
546 if (!bat_priv
->tt_global_hash
)
552 static void tt_changes_list_free(struct bat_priv
*bat_priv
)
554 struct tt_change_node
*entry
, *safe
;
556 spin_lock_bh(&bat_priv
->tt_changes_list_lock
);
558 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt_changes_list
,
560 list_del(&entry
->list
);
564 atomic_set(&bat_priv
->tt_local_changes
, 0);
565 spin_unlock_bh(&bat_priv
->tt_changes_list_lock
);
568 /* find out if an orig_node is already in the list of a tt_global_entry.
569 * returns 1 if found, 0 otherwise
571 static bool tt_global_entry_has_orig(const struct tt_global_entry
*entry
,
572 const struct orig_node
*orig_node
)
574 struct tt_orig_list_entry
*tmp_orig_entry
;
575 const struct hlist_head
*head
;
576 struct hlist_node
*node
;
580 head
= &entry
->orig_list
;
581 hlist_for_each_entry_rcu(tmp_orig_entry
, node
, head
, list
) {
582 if (tmp_orig_entry
->orig_node
== orig_node
) {
591 static void tt_global_add_orig_entry(struct tt_global_entry
*tt_global_entry
,
592 struct orig_node
*orig_node
,
595 struct tt_orig_list_entry
*orig_entry
;
597 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
601 INIT_HLIST_NODE(&orig_entry
->list
);
602 atomic_inc(&orig_node
->refcount
);
603 atomic_inc(&orig_node
->tt_size
);
604 orig_entry
->orig_node
= orig_node
;
605 orig_entry
->ttvn
= ttvn
;
607 spin_lock_bh(&tt_global_entry
->list_lock
);
608 hlist_add_head_rcu(&orig_entry
->list
,
609 &tt_global_entry
->orig_list
);
610 spin_unlock_bh(&tt_global_entry
->list_lock
);
613 /* caller must hold orig_node refcount */
614 int tt_global_add(struct bat_priv
*bat_priv
, struct orig_node
*orig_node
,
615 const unsigned char *tt_addr
, uint8_t ttvn
, bool roaming
,
618 struct tt_global_entry
*tt_global_entry
= NULL
;
622 tt_global_entry
= tt_global_hash_find(bat_priv
, tt_addr
);
624 if (!tt_global_entry
) {
625 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
),
627 if (!tt_global_entry
)
630 memcpy(tt_global_entry
->common
.addr
, tt_addr
, ETH_ALEN
);
632 tt_global_entry
->common
.flags
= NO_FLAGS
;
633 tt_global_entry
->roam_at
= 0;
634 atomic_set(&tt_global_entry
->common
.refcount
, 2);
636 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
637 spin_lock_init(&tt_global_entry
->list_lock
);
639 hash_added
= hash_add(bat_priv
->tt_global_hash
, compare_tt
,
640 choose_orig
, &tt_global_entry
->common
,
641 &tt_global_entry
->common
.hash_entry
);
643 if (unlikely(hash_added
!= 0)) {
644 /* remove the reference for the hash */
645 tt_global_entry_free_ref(tt_global_entry
);
649 tt_global_add_orig_entry(tt_global_entry
, orig_node
, ttvn
);
651 /* there is already a global entry, use this one. */
653 /* If there is the TT_CLIENT_ROAM flag set, there is only one
654 * originator left in the list and we previously received a
655 * delete + roaming change for this originator.
657 * We should first delete the old originator before adding the
660 if (tt_global_entry
->common
.flags
& TT_CLIENT_ROAM
) {
661 tt_global_del_orig_list(tt_global_entry
);
662 tt_global_entry
->common
.flags
&= ~TT_CLIENT_ROAM
;
663 tt_global_entry
->roam_at
= 0;
666 if (!tt_global_entry_has_orig(tt_global_entry
, orig_node
))
667 tt_global_add_orig_entry(tt_global_entry
, orig_node
,
672 tt_global_entry
->common
.flags
|= TT_CLIENT_WIFI
;
674 bat_dbg(DBG_TT
, bat_priv
,
675 "Creating new global tt entry: %pM (via %pM)\n",
676 tt_global_entry
->common
.addr
, orig_node
->orig
);
679 /* remove address from local hash if present */
680 tt_local_remove(bat_priv
, tt_global_entry
->common
.addr
,
681 "global tt received", roaming
);
685 tt_global_entry_free_ref(tt_global_entry
);
689 /* print all orig nodes who announce the address for this global entry.
690 * it is assumed that the caller holds rcu_read_lock();
692 static void tt_global_print_entry(struct tt_global_entry
*tt_global_entry
,
693 struct seq_file
*seq
)
695 struct hlist_head
*head
;
696 struct hlist_node
*node
;
697 struct tt_orig_list_entry
*orig_entry
;
698 struct tt_common_entry
*tt_common_entry
;
702 tt_common_entry
= &tt_global_entry
->common
;
704 head
= &tt_global_entry
->orig_list
;
706 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
707 flags
= tt_common_entry
->flags
;
708 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
709 seq_printf(seq
, " * %pM (%3u) via %pM (%3u) [%c%c]\n",
710 tt_global_entry
->common
.addr
, orig_entry
->ttvn
,
711 orig_entry
->orig_node
->orig
, last_ttvn
,
712 (flags
& TT_CLIENT_ROAM
? 'R' : '.'),
713 (flags
& TT_CLIENT_WIFI
? 'W' : '.'));
717 int tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
719 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
720 struct bat_priv
*bat_priv
= netdev_priv(net_dev
);
721 struct hashtable_t
*hash
= bat_priv
->tt_global_hash
;
722 struct tt_common_entry
*tt_common_entry
;
723 struct tt_global_entry
*tt_global_entry
;
724 struct hard_iface
*primary_if
;
725 struct hlist_node
*node
;
726 struct hlist_head
*head
;
730 primary_if
= primary_if_get_selected(bat_priv
);
732 ret
= seq_printf(seq
,
733 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
738 if (primary_if
->if_status
!= IF_ACTIVE
) {
739 ret
= seq_printf(seq
,
740 "BATMAN mesh %s disabled - primary interface not active\n",
746 "Globally announced TT entries received via the mesh %s\n",
748 seq_printf(seq
, " %-13s %s %-15s %s %s\n",
749 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
751 for (i
= 0; i
< hash
->size
; i
++) {
752 head
= &hash
->table
[i
];
755 hlist_for_each_entry_rcu(tt_common_entry
, node
,
757 tt_global_entry
= container_of(tt_common_entry
,
758 struct tt_global_entry
,
760 tt_global_print_entry(tt_global_entry
, seq
);
766 hardif_free_ref(primary_if
);
770 /* deletes the orig list of a tt_global_entry */
771 static void tt_global_del_orig_list(struct tt_global_entry
*tt_global_entry
)
773 struct hlist_head
*head
;
774 struct hlist_node
*node
, *safe
;
775 struct tt_orig_list_entry
*orig_entry
;
777 spin_lock_bh(&tt_global_entry
->list_lock
);
778 head
= &tt_global_entry
->orig_list
;
779 hlist_for_each_entry_safe(orig_entry
, node
, safe
, head
, list
) {
781 tt_orig_list_entry_free_ref(orig_entry
);
783 spin_unlock_bh(&tt_global_entry
->list_lock
);
787 static void tt_global_del_orig_entry(struct bat_priv
*bat_priv
,
788 struct tt_global_entry
*tt_global_entry
,
789 struct orig_node
*orig_node
,
792 struct hlist_head
*head
;
793 struct hlist_node
*node
, *safe
;
794 struct tt_orig_list_entry
*orig_entry
;
796 spin_lock_bh(&tt_global_entry
->list_lock
);
797 head
= &tt_global_entry
->orig_list
;
798 hlist_for_each_entry_safe(orig_entry
, node
, safe
, head
, list
) {
799 if (orig_entry
->orig_node
== orig_node
) {
800 bat_dbg(DBG_TT
, bat_priv
,
801 "Deleting %pM from global tt entry %pM: %s\n",
802 orig_node
->orig
, tt_global_entry
->common
.addr
,
805 tt_orig_list_entry_free_ref(orig_entry
);
808 spin_unlock_bh(&tt_global_entry
->list_lock
);
811 static void tt_global_del_struct(struct bat_priv
*bat_priv
,
812 struct tt_global_entry
*tt_global_entry
,
815 bat_dbg(DBG_TT
, bat_priv
,
816 "Deleting global tt entry %pM: %s\n",
817 tt_global_entry
->common
.addr
, message
);
819 hash_remove(bat_priv
->tt_global_hash
, compare_tt
, choose_orig
,
820 tt_global_entry
->common
.addr
);
821 tt_global_entry_free_ref(tt_global_entry
);
825 /* If the client is to be deleted, we check if it is the last origantor entry
826 * within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer,
827 * otherwise we simply remove the originator scheduled for deletion.
829 static void tt_global_del_roaming(struct bat_priv
*bat_priv
,
830 struct tt_global_entry
*tt_global_entry
,
831 struct orig_node
*orig_node
,
834 bool last_entry
= true;
835 struct hlist_head
*head
;
836 struct hlist_node
*node
;
837 struct tt_orig_list_entry
*orig_entry
;
839 /* no local entry exists, case 1:
840 * Check if this is the last one or if other entries exist.
844 head
= &tt_global_entry
->orig_list
;
845 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
846 if (orig_entry
->orig_node
!= orig_node
) {
854 /* its the last one, mark for roaming. */
855 tt_global_entry
->common
.flags
|= TT_CLIENT_ROAM
;
856 tt_global_entry
->roam_at
= jiffies
;
858 /* there is another entry, we can simply delete this
859 * one and can still use the other one.
861 tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
867 static void tt_global_del(struct bat_priv
*bat_priv
,
868 struct orig_node
*orig_node
,
869 const unsigned char *addr
,
870 const char *message
, bool roaming
)
872 struct tt_global_entry
*tt_global_entry
= NULL
;
873 struct tt_local_entry
*tt_local_entry
= NULL
;
875 tt_global_entry
= tt_global_hash_find(bat_priv
, addr
);
876 if (!tt_global_entry
)
880 tt_global_del_orig_entry(bat_priv
, tt_global_entry
, orig_node
,
883 if (hlist_empty(&tt_global_entry
->orig_list
))
884 tt_global_del_struct(bat_priv
, tt_global_entry
,
890 /* if we are deleting a global entry due to a roam
891 * event, there are two possibilities:
892 * 1) the client roamed from node A to node B => if there
893 * is only one originator left for this client, we mark
894 * it with TT_CLIENT_ROAM, we start a timer and we
895 * wait for node B to claim it. In case of timeout
896 * the entry is purged.
898 * If there are other originators left, we directly delete
900 * 2) the client roamed to us => we can directly delete
901 * the global entry, since it is useless now. */
903 tt_local_entry
= tt_local_hash_find(bat_priv
,
904 tt_global_entry
->common
.addr
);
905 if (tt_local_entry
) {
906 /* local entry exists, case 2: client roamed to us. */
907 tt_global_del_orig_list(tt_global_entry
);
908 tt_global_del_struct(bat_priv
, tt_global_entry
, message
);
910 /* no local entry exists, case 1: check for roaming */
911 tt_global_del_roaming(bat_priv
, tt_global_entry
, orig_node
,
917 tt_global_entry_free_ref(tt_global_entry
);
919 tt_local_entry_free_ref(tt_local_entry
);
922 void tt_global_del_orig(struct bat_priv
*bat_priv
,
923 struct orig_node
*orig_node
, const char *message
)
925 struct tt_global_entry
*tt_global_entry
;
926 struct tt_common_entry
*tt_common_entry
;
928 struct hashtable_t
*hash
= bat_priv
->tt_global_hash
;
929 struct hlist_node
*node
, *safe
;
930 struct hlist_head
*head
;
931 spinlock_t
*list_lock
; /* protects write access to the hash lists */
936 for (i
= 0; i
< hash
->size
; i
++) {
937 head
= &hash
->table
[i
];
938 list_lock
= &hash
->list_locks
[i
];
940 spin_lock_bh(list_lock
);
941 hlist_for_each_entry_safe(tt_common_entry
, node
, safe
,
943 tt_global_entry
= container_of(tt_common_entry
,
944 struct tt_global_entry
,
947 tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
950 if (hlist_empty(&tt_global_entry
->orig_list
)) {
951 bat_dbg(DBG_TT
, bat_priv
,
952 "Deleting global tt entry %pM: %s\n",
953 tt_global_entry
->common
.addr
,
956 tt_global_entry_free_ref(tt_global_entry
);
959 spin_unlock_bh(list_lock
);
961 atomic_set(&orig_node
->tt_size
, 0);
962 orig_node
->tt_initialised
= false;
965 static void tt_global_roam_purge(struct bat_priv
*bat_priv
)
967 struct hashtable_t
*hash
= bat_priv
->tt_global_hash
;
968 struct tt_common_entry
*tt_common_entry
;
969 struct tt_global_entry
*tt_global_entry
;
970 struct hlist_node
*node
, *node_tmp
;
971 struct hlist_head
*head
;
972 spinlock_t
*list_lock
; /* protects write access to the hash lists */
975 for (i
= 0; i
< hash
->size
; i
++) {
976 head
= &hash
->table
[i
];
977 list_lock
= &hash
->list_locks
[i
];
979 spin_lock_bh(list_lock
);
980 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
,
982 tt_global_entry
= container_of(tt_common_entry
,
983 struct tt_global_entry
,
985 if (!(tt_global_entry
->common
.flags
& TT_CLIENT_ROAM
))
987 if (!has_timed_out(tt_global_entry
->roam_at
,
988 TT_CLIENT_ROAM_TIMEOUT
))
991 bat_dbg(DBG_TT
, bat_priv
,
992 "Deleting global tt entry (%pM): Roaming timeout\n",
993 tt_global_entry
->common
.addr
);
996 tt_global_entry_free_ref(tt_global_entry
);
998 spin_unlock_bh(list_lock
);
1003 static void tt_global_table_free(struct bat_priv
*bat_priv
)
1005 struct hashtable_t
*hash
;
1006 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1007 struct tt_common_entry
*tt_common_entry
;
1008 struct tt_global_entry
*tt_global_entry
;
1009 struct hlist_node
*node
, *node_tmp
;
1010 struct hlist_head
*head
;
1013 if (!bat_priv
->tt_global_hash
)
1016 hash
= bat_priv
->tt_global_hash
;
1018 for (i
= 0; i
< hash
->size
; i
++) {
1019 head
= &hash
->table
[i
];
1020 list_lock
= &hash
->list_locks
[i
];
1022 spin_lock_bh(list_lock
);
1023 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
,
1025 hlist_del_rcu(node
);
1026 tt_global_entry
= container_of(tt_common_entry
,
1027 struct tt_global_entry
,
1029 tt_global_entry_free_ref(tt_global_entry
);
1031 spin_unlock_bh(list_lock
);
1034 batadv_hash_destroy(hash
);
1036 bat_priv
->tt_global_hash
= NULL
;
1039 static bool _is_ap_isolated(struct tt_local_entry
*tt_local_entry
,
1040 struct tt_global_entry
*tt_global_entry
)
1044 if (tt_local_entry
->common
.flags
& TT_CLIENT_WIFI
&&
1045 tt_global_entry
->common
.flags
& TT_CLIENT_WIFI
)
1051 struct orig_node
*transtable_search(struct bat_priv
*bat_priv
,
1052 const uint8_t *src
, const uint8_t *addr
)
1054 struct tt_local_entry
*tt_local_entry
= NULL
;
1055 struct tt_global_entry
*tt_global_entry
= NULL
;
1056 struct orig_node
*orig_node
= NULL
;
1057 struct neigh_node
*router
= NULL
;
1058 struct hlist_head
*head
;
1059 struct hlist_node
*node
;
1060 struct tt_orig_list_entry
*orig_entry
;
1063 if (src
&& atomic_read(&bat_priv
->ap_isolation
)) {
1064 tt_local_entry
= tt_local_hash_find(bat_priv
, src
);
1065 if (!tt_local_entry
)
1069 tt_global_entry
= tt_global_hash_find(bat_priv
, addr
);
1070 if (!tt_global_entry
)
1073 /* check whether the clients should not communicate due to AP
1075 if (tt_local_entry
&& _is_ap_isolated(tt_local_entry
, tt_global_entry
))
1081 head
= &tt_global_entry
->orig_list
;
1082 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
1083 router
= batadv_orig_node_get_router(orig_entry
->orig_node
);
1087 if (router
->tq_avg
> best_tq
) {
1088 orig_node
= orig_entry
->orig_node
;
1089 best_tq
= router
->tq_avg
;
1091 batadv_neigh_node_free_ref(router
);
1093 /* found anything? */
1094 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1098 if (tt_global_entry
)
1099 tt_global_entry_free_ref(tt_global_entry
);
1101 tt_local_entry_free_ref(tt_local_entry
);
1106 /* Calculates the checksum of the local table of a given orig_node */
1107 static uint16_t tt_global_crc(struct bat_priv
*bat_priv
,
1108 struct orig_node
*orig_node
)
1110 uint16_t total
= 0, total_one
;
1111 struct hashtable_t
*hash
= bat_priv
->tt_global_hash
;
1112 struct tt_common_entry
*tt_common_entry
;
1113 struct tt_global_entry
*tt_global_entry
;
1114 struct hlist_node
*node
;
1115 struct hlist_head
*head
;
1119 for (i
= 0; i
< hash
->size
; i
++) {
1120 head
= &hash
->table
[i
];
1123 hlist_for_each_entry_rcu(tt_common_entry
, node
,
1125 tt_global_entry
= container_of(tt_common_entry
,
1126 struct tt_global_entry
,
1128 /* Roaming clients are in the global table for
1129 * consistency only. They don't have to be
1130 * taken into account while computing the
1133 if (tt_global_entry
->common
.flags
& TT_CLIENT_ROAM
)
1136 /* find out if this global entry is announced by this
1139 if (!tt_global_entry_has_orig(tt_global_entry
,
1144 for (j
= 0; j
< ETH_ALEN
; j
++)
1145 total_one
= crc16_byte(total_one
,
1146 tt_global_entry
->common
.addr
[j
]);
1155 /* Calculates the checksum of the local table */
1156 static uint16_t batadv_tt_local_crc(struct bat_priv
*bat_priv
)
1158 uint16_t total
= 0, total_one
;
1159 struct hashtable_t
*hash
= bat_priv
->tt_local_hash
;
1160 struct tt_common_entry
*tt_common_entry
;
1161 struct hlist_node
*node
;
1162 struct hlist_head
*head
;
1166 for (i
= 0; i
< hash
->size
; i
++) {
1167 head
= &hash
->table
[i
];
1170 hlist_for_each_entry_rcu(tt_common_entry
, node
,
1172 /* not yet committed clients have not to be taken into
1173 * account while computing the CRC */
1174 if (tt_common_entry
->flags
& TT_CLIENT_NEW
)
1177 for (j
= 0; j
< ETH_ALEN
; j
++)
1178 total_one
= crc16_byte(total_one
,
1179 tt_common_entry
->addr
[j
]);
1188 static void tt_req_list_free(struct bat_priv
*bat_priv
)
1190 struct tt_req_node
*node
, *safe
;
1192 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1194 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_req_list
, list
) {
1195 list_del(&node
->list
);
1199 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1202 static void tt_save_orig_buffer(struct bat_priv
*bat_priv
,
1203 struct orig_node
*orig_node
,
1204 const unsigned char *tt_buff
,
1205 uint8_t tt_num_changes
)
1207 uint16_t tt_buff_len
= tt_len(tt_num_changes
);
1209 /* Replace the old buffer only if I received something in the
1210 * last OGM (the OGM could carry no changes) */
1211 spin_lock_bh(&orig_node
->tt_buff_lock
);
1212 if (tt_buff_len
> 0) {
1213 kfree(orig_node
->tt_buff
);
1214 orig_node
->tt_buff_len
= 0;
1215 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
1216 if (orig_node
->tt_buff
) {
1217 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
1218 orig_node
->tt_buff_len
= tt_buff_len
;
1221 spin_unlock_bh(&orig_node
->tt_buff_lock
);
1224 static void tt_req_purge(struct bat_priv
*bat_priv
)
1226 struct tt_req_node
*node
, *safe
;
1228 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1229 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_req_list
, list
) {
1230 if (has_timed_out(node
->issued_at
, TT_REQUEST_TIMEOUT
)) {
1231 list_del(&node
->list
);
1235 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1238 /* returns the pointer to the new tt_req_node struct if no request
1239 * has already been issued for this orig_node, NULL otherwise */
1240 static struct tt_req_node
*new_tt_req_node(struct bat_priv
*bat_priv
,
1241 struct orig_node
*orig_node
)
1243 struct tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
1245 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1246 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt_req_list
, list
) {
1247 if (compare_eth(tt_req_node_tmp
, orig_node
) &&
1248 !has_timed_out(tt_req_node_tmp
->issued_at
,
1249 TT_REQUEST_TIMEOUT
))
1253 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
1257 memcpy(tt_req_node
->addr
, orig_node
->orig
, ETH_ALEN
);
1258 tt_req_node
->issued_at
= jiffies
;
1260 list_add(&tt_req_node
->list
, &bat_priv
->tt_req_list
);
1262 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1266 /* data_ptr is useless here, but has to be kept to respect the prototype */
1267 static int tt_local_valid_entry(const void *entry_ptr
, const void *data_ptr
)
1269 const struct tt_common_entry
*tt_common_entry
= entry_ptr
;
1271 if (tt_common_entry
->flags
& TT_CLIENT_NEW
)
1276 static int tt_global_valid_entry(const void *entry_ptr
, const void *data_ptr
)
1278 const struct tt_common_entry
*tt_common_entry
= entry_ptr
;
1279 const struct tt_global_entry
*tt_global_entry
;
1280 const struct orig_node
*orig_node
= data_ptr
;
1282 if (tt_common_entry
->flags
& TT_CLIENT_ROAM
)
1285 tt_global_entry
= container_of(tt_common_entry
, struct tt_global_entry
,
1288 return tt_global_entry_has_orig(tt_global_entry
, orig_node
);
1291 static struct sk_buff
*tt_response_fill_table(uint16_t tt_len
, uint8_t ttvn
,
1292 struct hashtable_t
*hash
,
1293 struct hard_iface
*primary_if
,
1294 int (*valid_cb
)(const void *,
1298 struct tt_common_entry
*tt_common_entry
;
1299 struct tt_query_packet
*tt_response
;
1300 struct tt_change
*tt_change
;
1301 struct hlist_node
*node
;
1302 struct hlist_head
*head
;
1303 struct sk_buff
*skb
= NULL
;
1304 uint16_t tt_tot
, tt_count
;
1305 ssize_t tt_query_size
= sizeof(struct tt_query_packet
);
1308 if (tt_query_size
+ tt_len
> primary_if
->soft_iface
->mtu
) {
1309 tt_len
= primary_if
->soft_iface
->mtu
- tt_query_size
;
1310 tt_len
-= tt_len
% sizeof(struct tt_change
);
1312 tt_tot
= tt_len
/ sizeof(struct tt_change
);
1314 skb
= dev_alloc_skb(tt_query_size
+ tt_len
+ ETH_HLEN
);
1318 skb_reserve(skb
, ETH_HLEN
);
1319 tt_response
= (struct tt_query_packet
*)skb_put(skb
,
1320 tt_query_size
+ tt_len
);
1321 tt_response
->ttvn
= ttvn
;
1323 tt_change
= (struct tt_change
*)(skb
->data
+ tt_query_size
);
1327 for (i
= 0; i
< hash
->size
; i
++) {
1328 head
= &hash
->table
[i
];
1330 hlist_for_each_entry_rcu(tt_common_entry
, node
,
1332 if (tt_count
== tt_tot
)
1335 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
1338 memcpy(tt_change
->addr
, tt_common_entry
->addr
,
1340 tt_change
->flags
= NO_FLAGS
;
1348 /* store in the message the number of entries we have successfully
1350 tt_response
->tt_data
= htons(tt_count
);
1356 static int send_tt_request(struct bat_priv
*bat_priv
,
1357 struct orig_node
*dst_orig_node
,
1358 uint8_t ttvn
, uint16_t tt_crc
, bool full_table
)
1360 struct sk_buff
*skb
= NULL
;
1361 struct tt_query_packet
*tt_request
;
1362 struct neigh_node
*neigh_node
= NULL
;
1363 struct hard_iface
*primary_if
;
1364 struct tt_req_node
*tt_req_node
= NULL
;
1367 primary_if
= primary_if_get_selected(bat_priv
);
1371 /* The new tt_req will be issued only if I'm not waiting for a
1372 * reply from the same orig_node yet */
1373 tt_req_node
= new_tt_req_node(bat_priv
, dst_orig_node
);
1377 skb
= dev_alloc_skb(sizeof(struct tt_query_packet
) + ETH_HLEN
);
1381 skb_reserve(skb
, ETH_HLEN
);
1383 tt_request
= (struct tt_query_packet
*)skb_put(skb
,
1384 sizeof(struct tt_query_packet
));
1386 tt_request
->header
.packet_type
= BAT_TT_QUERY
;
1387 tt_request
->header
.version
= COMPAT_VERSION
;
1388 memcpy(tt_request
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1389 memcpy(tt_request
->dst
, dst_orig_node
->orig
, ETH_ALEN
);
1390 tt_request
->header
.ttl
= TTL
;
1391 tt_request
->ttvn
= ttvn
;
1392 tt_request
->tt_data
= htons(tt_crc
);
1393 tt_request
->flags
= TT_REQUEST
;
1396 tt_request
->flags
|= TT_FULL_TABLE
;
1398 neigh_node
= batadv_orig_node_get_router(dst_orig_node
);
1402 bat_dbg(DBG_TT
, bat_priv
,
1403 "Sending TT_REQUEST to %pM via %pM [%c]\n",
1404 dst_orig_node
->orig
, neigh_node
->addr
,
1405 (full_table
? 'F' : '.'));
1407 batadv_inc_counter(bat_priv
, BAT_CNT_TT_REQUEST_TX
);
1409 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
1414 batadv_neigh_node_free_ref(neigh_node
);
1416 hardif_free_ref(primary_if
);
1419 if (ret
&& tt_req_node
) {
1420 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1421 list_del(&tt_req_node
->list
);
1422 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1428 static bool send_other_tt_response(struct bat_priv
*bat_priv
,
1429 struct tt_query_packet
*tt_request
)
1431 struct orig_node
*req_dst_orig_node
= NULL
, *res_dst_orig_node
= NULL
;
1432 struct neigh_node
*neigh_node
= NULL
;
1433 struct hard_iface
*primary_if
= NULL
;
1434 uint8_t orig_ttvn
, req_ttvn
, ttvn
;
1436 unsigned char *tt_buff
;
1438 uint16_t tt_len
, tt_tot
;
1439 struct sk_buff
*skb
= NULL
;
1440 struct tt_query_packet
*tt_response
;
1442 bat_dbg(DBG_TT
, bat_priv
,
1443 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1444 tt_request
->src
, tt_request
->ttvn
, tt_request
->dst
,
1445 (tt_request
->flags
& TT_FULL_TABLE
? 'F' : '.'));
1447 /* Let's get the orig node of the REAL destination */
1448 req_dst_orig_node
= orig_hash_find(bat_priv
, tt_request
->dst
);
1449 if (!req_dst_orig_node
)
1452 res_dst_orig_node
= orig_hash_find(bat_priv
, tt_request
->src
);
1453 if (!res_dst_orig_node
)
1456 neigh_node
= batadv_orig_node_get_router(res_dst_orig_node
);
1460 primary_if
= primary_if_get_selected(bat_priv
);
1464 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
1465 req_ttvn
= tt_request
->ttvn
;
1467 /* I don't have the requested data */
1468 if (orig_ttvn
!= req_ttvn
||
1469 tt_request
->tt_data
!= htons(req_dst_orig_node
->tt_crc
))
1472 /* If the full table has been explicitly requested */
1473 if (tt_request
->flags
& TT_FULL_TABLE
||
1474 !req_dst_orig_node
->tt_buff
)
1479 /* In this version, fragmentation is not implemented, then
1480 * I'll send only one packet with as much TT entries as I can */
1482 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
1483 tt_len
= req_dst_orig_node
->tt_buff_len
;
1484 tt_tot
= tt_len
/ sizeof(struct tt_change
);
1486 skb
= dev_alloc_skb(sizeof(struct tt_query_packet
) +
1491 skb_reserve(skb
, ETH_HLEN
);
1492 tt_response
= (struct tt_query_packet
*)skb_put(skb
,
1493 sizeof(struct tt_query_packet
) + tt_len
);
1494 tt_response
->ttvn
= req_ttvn
;
1495 tt_response
->tt_data
= htons(tt_tot
);
1497 tt_buff
= skb
->data
+ sizeof(struct tt_query_packet
);
1498 /* Copy the last orig_node's OGM buffer */
1499 memcpy(tt_buff
, req_dst_orig_node
->tt_buff
,
1500 req_dst_orig_node
->tt_buff_len
);
1502 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
1504 tt_len
= (uint16_t)atomic_read(&req_dst_orig_node
->tt_size
) *
1505 sizeof(struct tt_change
);
1506 ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
1508 skb
= tt_response_fill_table(tt_len
, ttvn
,
1509 bat_priv
->tt_global_hash
,
1510 primary_if
, tt_global_valid_entry
,
1515 tt_response
= (struct tt_query_packet
*)skb
->data
;
1518 tt_response
->header
.packet_type
= BAT_TT_QUERY
;
1519 tt_response
->header
.version
= COMPAT_VERSION
;
1520 tt_response
->header
.ttl
= TTL
;
1521 memcpy(tt_response
->src
, req_dst_orig_node
->orig
, ETH_ALEN
);
1522 memcpy(tt_response
->dst
, tt_request
->src
, ETH_ALEN
);
1523 tt_response
->flags
= TT_RESPONSE
;
1526 tt_response
->flags
|= TT_FULL_TABLE
;
1528 bat_dbg(DBG_TT
, bat_priv
,
1529 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1530 res_dst_orig_node
->orig
, neigh_node
->addr
,
1531 req_dst_orig_node
->orig
, req_ttvn
);
1533 batadv_inc_counter(bat_priv
, BAT_CNT_TT_RESPONSE_TX
);
1535 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
1540 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
1543 if (res_dst_orig_node
)
1544 batadv_orig_node_free_ref(res_dst_orig_node
);
1545 if (req_dst_orig_node
)
1546 batadv_orig_node_free_ref(req_dst_orig_node
);
1548 batadv_neigh_node_free_ref(neigh_node
);
1550 hardif_free_ref(primary_if
);
1556 static bool send_my_tt_response(struct bat_priv
*bat_priv
,
1557 struct tt_query_packet
*tt_request
)
1559 struct orig_node
*orig_node
= NULL
;
1560 struct neigh_node
*neigh_node
= NULL
;
1561 struct hard_iface
*primary_if
= NULL
;
1562 uint8_t my_ttvn
, req_ttvn
, ttvn
;
1564 unsigned char *tt_buff
;
1566 uint16_t tt_len
, tt_tot
;
1567 struct sk_buff
*skb
= NULL
;
1568 struct tt_query_packet
*tt_response
;
1570 bat_dbg(DBG_TT
, bat_priv
,
1571 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1572 tt_request
->src
, tt_request
->ttvn
,
1573 (tt_request
->flags
& TT_FULL_TABLE
? 'F' : '.'));
1576 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->ttvn
);
1577 req_ttvn
= tt_request
->ttvn
;
1579 orig_node
= orig_hash_find(bat_priv
, tt_request
->src
);
1583 neigh_node
= batadv_orig_node_get_router(orig_node
);
1587 primary_if
= primary_if_get_selected(bat_priv
);
1591 /* If the full table has been explicitly requested or the gap
1592 * is too big send the whole local translation table */
1593 if (tt_request
->flags
& TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
1599 /* In this version, fragmentation is not implemented, then
1600 * I'll send only one packet with as much TT entries as I can */
1602 spin_lock_bh(&bat_priv
->tt_buff_lock
);
1603 tt_len
= bat_priv
->tt_buff_len
;
1604 tt_tot
= tt_len
/ sizeof(struct tt_change
);
1606 skb
= dev_alloc_skb(sizeof(struct tt_query_packet
) +
1611 skb_reserve(skb
, ETH_HLEN
);
1612 tt_response
= (struct tt_query_packet
*)skb_put(skb
,
1613 sizeof(struct tt_query_packet
) + tt_len
);
1614 tt_response
->ttvn
= req_ttvn
;
1615 tt_response
->tt_data
= htons(tt_tot
);
1617 tt_buff
= skb
->data
+ sizeof(struct tt_query_packet
);
1618 memcpy(tt_buff
, bat_priv
->tt_buff
,
1619 bat_priv
->tt_buff_len
);
1620 spin_unlock_bh(&bat_priv
->tt_buff_lock
);
1622 tt_len
= (uint16_t)atomic_read(&bat_priv
->num_local_tt
) *
1623 sizeof(struct tt_change
);
1624 ttvn
= (uint8_t)atomic_read(&bat_priv
->ttvn
);
1626 skb
= tt_response_fill_table(tt_len
, ttvn
,
1627 bat_priv
->tt_local_hash
,
1628 primary_if
, tt_local_valid_entry
,
1633 tt_response
= (struct tt_query_packet
*)skb
->data
;
1636 tt_response
->header
.packet_type
= BAT_TT_QUERY
;
1637 tt_response
->header
.version
= COMPAT_VERSION
;
1638 tt_response
->header
.ttl
= TTL
;
1639 memcpy(tt_response
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1640 memcpy(tt_response
->dst
, tt_request
->src
, ETH_ALEN
);
1641 tt_response
->flags
= TT_RESPONSE
;
1644 tt_response
->flags
|= TT_FULL_TABLE
;
1646 bat_dbg(DBG_TT
, bat_priv
,
1647 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1648 orig_node
->orig
, neigh_node
->addr
,
1649 (tt_response
->flags
& TT_FULL_TABLE
? 'F' : '.'));
1651 batadv_inc_counter(bat_priv
, BAT_CNT_TT_RESPONSE_TX
);
1653 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
1658 spin_unlock_bh(&bat_priv
->tt_buff_lock
);
1661 batadv_orig_node_free_ref(orig_node
);
1663 batadv_neigh_node_free_ref(neigh_node
);
1665 hardif_free_ref(primary_if
);
1668 /* This packet was for me, so it doesn't need to be re-routed */
1672 bool send_tt_response(struct bat_priv
*bat_priv
,
1673 struct tt_query_packet
*tt_request
)
1675 if (is_my_mac(tt_request
->dst
)) {
1676 /* don't answer backbone gws! */
1677 if (batadv_bla_is_backbone_gw_orig(bat_priv
, tt_request
->src
))
1680 return send_my_tt_response(bat_priv
, tt_request
);
1682 return send_other_tt_response(bat_priv
, tt_request
);
1686 static void _tt_update_changes(struct bat_priv
*bat_priv
,
1687 struct orig_node
*orig_node
,
1688 struct tt_change
*tt_change
,
1689 uint16_t tt_num_changes
, uint8_t ttvn
)
1693 for (i
= 0; i
< tt_num_changes
; i
++) {
1694 if ((tt_change
+ i
)->flags
& TT_CLIENT_DEL
)
1695 tt_global_del(bat_priv
, orig_node
,
1696 (tt_change
+ i
)->addr
,
1697 "tt removed by changes",
1698 (tt_change
+ i
)->flags
& TT_CLIENT_ROAM
);
1700 if (!tt_global_add(bat_priv
, orig_node
,
1701 (tt_change
+ i
)->addr
, ttvn
, false,
1702 (tt_change
+ i
)->flags
&
1704 /* In case of problem while storing a
1705 * global_entry, we stop the updating
1706 * procedure without committing the
1707 * ttvn change. This will avoid to send
1708 * corrupted data on tt_request
1712 orig_node
->tt_initialised
= true;
1715 static void tt_fill_gtable(struct bat_priv
*bat_priv
,
1716 struct tt_query_packet
*tt_response
)
1718 struct orig_node
*orig_node
= NULL
;
1720 orig_node
= orig_hash_find(bat_priv
, tt_response
->src
);
1724 /* Purge the old table first.. */
1725 tt_global_del_orig(bat_priv
, orig_node
, "Received full table");
1727 _tt_update_changes(bat_priv
, orig_node
,
1728 (struct tt_change
*)(tt_response
+ 1),
1729 ntohs(tt_response
->tt_data
), tt_response
->ttvn
);
1731 spin_lock_bh(&orig_node
->tt_buff_lock
);
1732 kfree(orig_node
->tt_buff
);
1733 orig_node
->tt_buff_len
= 0;
1734 orig_node
->tt_buff
= NULL
;
1735 spin_unlock_bh(&orig_node
->tt_buff_lock
);
1737 atomic_set(&orig_node
->last_ttvn
, tt_response
->ttvn
);
1741 batadv_orig_node_free_ref(orig_node
);
1744 static void tt_update_changes(struct bat_priv
*bat_priv
,
1745 struct orig_node
*orig_node
,
1746 uint16_t tt_num_changes
, uint8_t ttvn
,
1747 struct tt_change
*tt_change
)
1749 _tt_update_changes(bat_priv
, orig_node
, tt_change
, tt_num_changes
,
1752 tt_save_orig_buffer(bat_priv
, orig_node
, (unsigned char *)tt_change
,
1754 atomic_set(&orig_node
->last_ttvn
, ttvn
);
1757 bool is_my_client(struct bat_priv
*bat_priv
, const uint8_t *addr
)
1759 struct tt_local_entry
*tt_local_entry
= NULL
;
1762 tt_local_entry
= tt_local_hash_find(bat_priv
, addr
);
1763 if (!tt_local_entry
)
1765 /* Check if the client has been logically deleted (but is kept for
1766 * consistency purpose) */
1767 if (tt_local_entry
->common
.flags
& TT_CLIENT_PENDING
)
1772 tt_local_entry_free_ref(tt_local_entry
);
1776 void handle_tt_response(struct bat_priv
*bat_priv
,
1777 struct tt_query_packet
*tt_response
)
1779 struct tt_req_node
*node
, *safe
;
1780 struct orig_node
*orig_node
= NULL
;
1782 bat_dbg(DBG_TT
, bat_priv
,
1783 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
1784 tt_response
->src
, tt_response
->ttvn
,
1785 ntohs(tt_response
->tt_data
),
1786 (tt_response
->flags
& TT_FULL_TABLE
? 'F' : '.'));
1788 /* we should have never asked a backbone gw */
1789 if (batadv_bla_is_backbone_gw_orig(bat_priv
, tt_response
->src
))
1792 orig_node
= orig_hash_find(bat_priv
, tt_response
->src
);
1796 if (tt_response
->flags
& TT_FULL_TABLE
)
1797 tt_fill_gtable(bat_priv
, tt_response
);
1799 tt_update_changes(bat_priv
, orig_node
,
1800 ntohs(tt_response
->tt_data
),
1802 (struct tt_change
*)(tt_response
+ 1));
1804 /* Delete the tt_req_node from pending tt_requests list */
1805 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1806 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_req_list
, list
) {
1807 if (!compare_eth(node
->addr
, tt_response
->src
))
1809 list_del(&node
->list
);
1812 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1814 /* Recalculate the CRC for this orig_node and store it */
1815 orig_node
->tt_crc
= tt_global_crc(bat_priv
, orig_node
);
1816 /* Roaming phase is over: tables are in sync again. I can
1818 orig_node
->tt_poss_change
= false;
1821 batadv_orig_node_free_ref(orig_node
);
1824 int tt_init(struct bat_priv
*bat_priv
)
1828 ret
= tt_local_init(bat_priv
);
1832 ret
= tt_global_init(bat_priv
);
1836 tt_start_timer(bat_priv
);
1841 static void tt_roam_list_free(struct bat_priv
*bat_priv
)
1843 struct tt_roam_node
*node
, *safe
;
1845 spin_lock_bh(&bat_priv
->tt_roam_list_lock
);
1847 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_roam_list
, list
) {
1848 list_del(&node
->list
);
1852 spin_unlock_bh(&bat_priv
->tt_roam_list_lock
);
1855 static void tt_roam_purge(struct bat_priv
*bat_priv
)
1857 struct tt_roam_node
*node
, *safe
;
1859 spin_lock_bh(&bat_priv
->tt_roam_list_lock
);
1860 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_roam_list
, list
) {
1861 if (!has_timed_out(node
->first_time
, ROAMING_MAX_TIME
))
1864 list_del(&node
->list
);
1867 spin_unlock_bh(&bat_priv
->tt_roam_list_lock
);
1870 /* This function checks whether the client already reached the
1871 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1874 * returns true if the ROAMING_ADV can be sent, false otherwise */
1875 static bool tt_check_roam_count(struct bat_priv
*bat_priv
,
1878 struct tt_roam_node
*tt_roam_node
;
1881 spin_lock_bh(&bat_priv
->tt_roam_list_lock
);
1882 /* The new tt_req will be issued only if I'm not waiting for a
1883 * reply from the same orig_node yet */
1884 list_for_each_entry(tt_roam_node
, &bat_priv
->tt_roam_list
, list
) {
1885 if (!compare_eth(tt_roam_node
->addr
, client
))
1888 if (has_timed_out(tt_roam_node
->first_time
, ROAMING_MAX_TIME
))
1891 if (!atomic_dec_not_zero(&tt_roam_node
->counter
))
1892 /* Sorry, you roamed too many times! */
1899 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
1903 tt_roam_node
->first_time
= jiffies
;
1904 atomic_set(&tt_roam_node
->counter
, ROAMING_MAX_COUNT
- 1);
1905 memcpy(tt_roam_node
->addr
, client
, ETH_ALEN
);
1907 list_add(&tt_roam_node
->list
, &bat_priv
->tt_roam_list
);
1912 spin_unlock_bh(&bat_priv
->tt_roam_list_lock
);
1916 static void send_roam_adv(struct bat_priv
*bat_priv
, uint8_t *client
,
1917 struct orig_node
*orig_node
)
1919 struct neigh_node
*neigh_node
= NULL
;
1920 struct sk_buff
*skb
= NULL
;
1921 struct roam_adv_packet
*roam_adv_packet
;
1923 struct hard_iface
*primary_if
;
1925 /* before going on we have to check whether the client has
1926 * already roamed to us too many times */
1927 if (!tt_check_roam_count(bat_priv
, client
))
1930 skb
= dev_alloc_skb(sizeof(struct roam_adv_packet
) + ETH_HLEN
);
1934 skb_reserve(skb
, ETH_HLEN
);
1936 roam_adv_packet
= (struct roam_adv_packet
*)skb_put(skb
,
1937 sizeof(struct roam_adv_packet
));
1939 roam_adv_packet
->header
.packet_type
= BAT_ROAM_ADV
;
1940 roam_adv_packet
->header
.version
= COMPAT_VERSION
;
1941 roam_adv_packet
->header
.ttl
= TTL
;
1942 primary_if
= primary_if_get_selected(bat_priv
);
1945 memcpy(roam_adv_packet
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1946 hardif_free_ref(primary_if
);
1947 memcpy(roam_adv_packet
->dst
, orig_node
->orig
, ETH_ALEN
);
1948 memcpy(roam_adv_packet
->client
, client
, ETH_ALEN
);
1950 neigh_node
= batadv_orig_node_get_router(orig_node
);
1954 bat_dbg(DBG_TT
, bat_priv
,
1955 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1956 orig_node
->orig
, client
, neigh_node
->addr
);
1958 batadv_inc_counter(bat_priv
, BAT_CNT_TT_ROAM_ADV_TX
);
1960 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
1965 batadv_neigh_node_free_ref(neigh_node
);
1971 static void tt_purge(struct work_struct
*work
)
1973 struct delayed_work
*delayed_work
=
1974 container_of(work
, struct delayed_work
, work
);
1975 struct bat_priv
*bat_priv
=
1976 container_of(delayed_work
, struct bat_priv
, tt_work
);
1978 tt_local_purge(bat_priv
);
1979 tt_global_roam_purge(bat_priv
);
1980 tt_req_purge(bat_priv
);
1981 tt_roam_purge(bat_priv
);
1983 tt_start_timer(bat_priv
);
1986 void tt_free(struct bat_priv
*bat_priv
)
1988 cancel_delayed_work_sync(&bat_priv
->tt_work
);
1990 tt_local_table_free(bat_priv
);
1991 tt_global_table_free(bat_priv
);
1992 tt_req_list_free(bat_priv
);
1993 tt_changes_list_free(bat_priv
);
1994 tt_roam_list_free(bat_priv
);
1996 kfree(bat_priv
->tt_buff
);
1999 /* This function will enable or disable the specified flags for all the entries
2000 * in the given hash table and returns the number of modified entries */
2001 static uint16_t tt_set_flags(struct hashtable_t
*hash
, uint16_t flags
,
2005 uint16_t changed_num
= 0;
2006 struct hlist_head
*head
;
2007 struct hlist_node
*node
;
2008 struct tt_common_entry
*tt_common_entry
;
2013 for (i
= 0; i
< hash
->size
; i
++) {
2014 head
= &hash
->table
[i
];
2017 hlist_for_each_entry_rcu(tt_common_entry
, node
,
2020 if ((tt_common_entry
->flags
& flags
) == flags
)
2022 tt_common_entry
->flags
|= flags
;
2024 if (!(tt_common_entry
->flags
& flags
))
2026 tt_common_entry
->flags
&= ~flags
;
2036 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
2037 static void tt_local_purge_pending_clients(struct bat_priv
*bat_priv
)
2039 struct hashtable_t
*hash
= bat_priv
->tt_local_hash
;
2040 struct tt_common_entry
*tt_common_entry
;
2041 struct tt_local_entry
*tt_local_entry
;
2042 struct hlist_node
*node
, *node_tmp
;
2043 struct hlist_head
*head
;
2044 spinlock_t
*list_lock
; /* protects write access to the hash lists */
2050 for (i
= 0; i
< hash
->size
; i
++) {
2051 head
= &hash
->table
[i
];
2052 list_lock
= &hash
->list_locks
[i
];
2054 spin_lock_bh(list_lock
);
2055 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
,
2057 if (!(tt_common_entry
->flags
& TT_CLIENT_PENDING
))
2060 bat_dbg(DBG_TT
, bat_priv
,
2061 "Deleting local tt entry (%pM): pending\n",
2062 tt_common_entry
->addr
);
2064 atomic_dec(&bat_priv
->num_local_tt
);
2065 hlist_del_rcu(node
);
2066 tt_local_entry
= container_of(tt_common_entry
,
2067 struct tt_local_entry
,
2069 tt_local_entry_free_ref(tt_local_entry
);
2071 spin_unlock_bh(list_lock
);
2076 static int tt_commit_changes(struct bat_priv
*bat_priv
,
2077 unsigned char **packet_buff
, int *packet_buff_len
,
2080 uint16_t changed_num
= 0;
2082 if (atomic_read(&bat_priv
->tt_local_changes
) < 1)
2085 changed_num
= tt_set_flags(bat_priv
->tt_local_hash
,
2086 TT_CLIENT_NEW
, false);
2088 /* all reset entries have to be counted as local entries */
2089 atomic_add(changed_num
, &bat_priv
->num_local_tt
);
2090 tt_local_purge_pending_clients(bat_priv
);
2091 bat_priv
->tt_crc
= batadv_tt_local_crc(bat_priv
);
2093 /* Increment the TTVN only once per OGM interval */
2094 atomic_inc(&bat_priv
->ttvn
);
2095 bat_dbg(DBG_TT
, bat_priv
, "Local changes committed, updating to ttvn %u\n",
2096 (uint8_t)atomic_read(&bat_priv
->ttvn
));
2097 bat_priv
->tt_poss_change
= false;
2099 /* reset the sending counter */
2100 atomic_set(&bat_priv
->tt_ogm_append_cnt
, TT_OGM_APPEND_MAX
);
2102 return tt_changes_fill_buff(bat_priv
, packet_buff
,
2103 packet_buff_len
, packet_min_len
);
2106 /* when calling this function (hard_iface == primary_if) has to be true */
2107 int batadv_tt_append_diff(struct bat_priv
*bat_priv
,
2108 unsigned char **packet_buff
, int *packet_buff_len
,
2113 /* if at least one change happened */
2114 tt_num_changes
= tt_commit_changes(bat_priv
, packet_buff
,
2115 packet_buff_len
, packet_min_len
);
2117 /* if the changes have been sent often enough */
2118 if ((tt_num_changes
< 0) &&
2119 (!atomic_dec_not_zero(&bat_priv
->tt_ogm_append_cnt
))) {
2120 tt_realloc_packet_buff(packet_buff
, packet_buff_len
,
2121 packet_min_len
, packet_min_len
);
2125 return tt_num_changes
;
2128 bool is_ap_isolated(struct bat_priv
*bat_priv
, uint8_t *src
, uint8_t *dst
)
2130 struct tt_local_entry
*tt_local_entry
= NULL
;
2131 struct tt_global_entry
*tt_global_entry
= NULL
;
2134 if (!atomic_read(&bat_priv
->ap_isolation
))
2137 tt_local_entry
= tt_local_hash_find(bat_priv
, dst
);
2138 if (!tt_local_entry
)
2141 tt_global_entry
= tt_global_hash_find(bat_priv
, src
);
2142 if (!tt_global_entry
)
2145 if (_is_ap_isolated(tt_local_entry
, tt_global_entry
))
2151 if (tt_global_entry
)
2152 tt_global_entry_free_ref(tt_global_entry
);
2154 tt_local_entry_free_ref(tt_local_entry
);
2158 void tt_update_orig(struct bat_priv
*bat_priv
, struct orig_node
*orig_node
,
2159 const unsigned char *tt_buff
, uint8_t tt_num_changes
,
2160 uint8_t ttvn
, uint16_t tt_crc
)
2162 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
2163 bool full_table
= true;
2165 /* don't care about a backbone gateways updates. */
2166 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
2169 /* orig table not initialised AND first diff is in the OGM OR the ttvn
2170 * increased by one -> we can apply the attached changes */
2171 if ((!orig_node
->tt_initialised
&& ttvn
== 1) ||
2172 ttvn
- orig_ttvn
== 1) {
2173 /* the OGM could not contain the changes due to their size or
2174 * because they have already been sent TT_OGM_APPEND_MAX times.
2175 * In this case send a tt request */
2176 if (!tt_num_changes
) {
2181 tt_update_changes(bat_priv
, orig_node
, tt_num_changes
, ttvn
,
2182 (struct tt_change
*)tt_buff
);
2184 /* Even if we received the precomputed crc with the OGM, we
2185 * prefer to recompute it to spot any possible inconsistency
2186 * in the global table */
2187 orig_node
->tt_crc
= tt_global_crc(bat_priv
, orig_node
);
2189 /* The ttvn alone is not enough to guarantee consistency
2190 * because a single value could represent different states
2191 * (due to the wrap around). Thus a node has to check whether
2192 * the resulting table (after applying the changes) is still
2193 * consistent or not. E.g. a node could disconnect while its
2194 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2195 * checking the CRC value is mandatory to detect the
2197 if (orig_node
->tt_crc
!= tt_crc
)
2200 /* Roaming phase is over: tables are in sync again. I can
2202 orig_node
->tt_poss_change
= false;
2204 /* if we missed more than one change or our tables are not
2205 * in sync anymore -> request fresh tt data */
2207 if (!orig_node
->tt_initialised
|| ttvn
!= orig_ttvn
||
2208 orig_node
->tt_crc
!= tt_crc
) {
2210 bat_dbg(DBG_TT
, bat_priv
,
2211 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2212 orig_node
->orig
, ttvn
, orig_ttvn
, tt_crc
,
2213 orig_node
->tt_crc
, tt_num_changes
);
2214 send_tt_request(bat_priv
, orig_node
, ttvn
, tt_crc
,
2221 /* returns true whether we know that the client has moved from its old
2222 * originator to another one. This entry is kept is still kept for consistency
2225 bool tt_global_client_is_roaming(struct bat_priv
*bat_priv
, uint8_t *addr
)
2227 struct tt_global_entry
*tt_global_entry
;
2230 tt_global_entry
= tt_global_hash_find(bat_priv
, addr
);
2231 if (!tt_global_entry
)
2234 ret
= tt_global_entry
->common
.flags
& TT_CLIENT_ROAM
;
2235 tt_global_entry_free_ref(tt_global_entry
);