1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
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.
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.
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
21 #include "translation-table.h"
22 #include "soft-interface.h"
23 #include "hard-interface.h"
26 #include "originator.h"
28 #include "bridge_loop_avoidance.h"
30 #include <linux/crc16.h>
32 static void send_roam_adv(struct bat_priv
*bat_priv
, uint8_t *client
,
33 struct orig_node
*orig_node
);
34 static void tt_purge(struct work_struct
*work
);
35 static void tt_global_del_orig_list(struct tt_global_entry
*tt_global_entry
);
37 /* returns 1 if they are the same mac addr */
38 static int compare_tt(const struct hlist_node
*node
, const void *data2
)
40 const void *data1
= container_of(node
, struct tt_common_entry
,
43 return (memcmp(data1
, data2
, ETH_ALEN
) == 0 ? 1 : 0);
46 static void tt_start_timer(struct bat_priv
*bat_priv
)
48 INIT_DELAYED_WORK(&bat_priv
->tt_work
, tt_purge
);
49 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt_work
,
50 msecs_to_jiffies(5000));
53 static struct tt_common_entry
*tt_hash_find(struct hashtable_t
*hash
,
56 struct hlist_head
*head
;
57 struct hlist_node
*node
;
58 struct tt_common_entry
*tt_common_entry
, *tt_common_entry_tmp
= NULL
;
64 index
= choose_orig(data
, hash
->size
);
65 head
= &hash
->table
[index
];
68 hlist_for_each_entry_rcu(tt_common_entry
, node
, head
, hash_entry
) {
69 if (!compare_eth(tt_common_entry
, data
))
72 if (!atomic_inc_not_zero(&tt_common_entry
->refcount
))
75 tt_common_entry_tmp
= tt_common_entry
;
80 return tt_common_entry_tmp
;
83 static struct tt_local_entry
*tt_local_hash_find(struct bat_priv
*bat_priv
,
86 struct tt_common_entry
*tt_common_entry
;
87 struct tt_local_entry
*tt_local_entry
= NULL
;
89 tt_common_entry
= tt_hash_find(bat_priv
->tt_local_hash
, data
);
91 tt_local_entry
= container_of(tt_common_entry
,
92 struct tt_local_entry
, common
);
93 return tt_local_entry
;
96 static struct tt_global_entry
*tt_global_hash_find(struct bat_priv
*bat_priv
,
99 struct tt_common_entry
*tt_common_entry
;
100 struct tt_global_entry
*tt_global_entry
= NULL
;
102 tt_common_entry
= tt_hash_find(bat_priv
->tt_global_hash
, data
);
104 tt_global_entry
= container_of(tt_common_entry
,
105 struct tt_global_entry
, common
);
106 return tt_global_entry
;
110 static void tt_local_entry_free_ref(struct tt_local_entry
*tt_local_entry
)
112 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
113 kfree_rcu(tt_local_entry
, common
.rcu
);
116 static void tt_global_entry_free_rcu(struct rcu_head
*rcu
)
118 struct tt_common_entry
*tt_common_entry
;
119 struct tt_global_entry
*tt_global_entry
;
121 tt_common_entry
= container_of(rcu
, struct tt_common_entry
, rcu
);
122 tt_global_entry
= container_of(tt_common_entry
, struct tt_global_entry
,
125 kfree(tt_global_entry
);
128 static void tt_global_entry_free_ref(struct tt_global_entry
*tt_global_entry
)
130 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
131 tt_global_del_orig_list(tt_global_entry
);
132 call_rcu(&tt_global_entry
->common
.rcu
,
133 tt_global_entry_free_rcu
);
137 static void tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
139 struct tt_orig_list_entry
*orig_entry
;
141 orig_entry
= container_of(rcu
, struct tt_orig_list_entry
, rcu
);
142 atomic_dec(&orig_entry
->orig_node
->tt_size
);
143 batadv_orig_node_free_ref(orig_entry
->orig_node
);
147 static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry
*orig_entry
)
149 call_rcu(&orig_entry
->rcu
, tt_orig_list_entry_free_rcu
);
152 static void tt_local_event(struct bat_priv
*bat_priv
, const uint8_t *addr
,
155 struct tt_change_node
*tt_change_node
;
157 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
162 tt_change_node
->change
.flags
= flags
;
163 memcpy(tt_change_node
->change
.addr
, addr
, ETH_ALEN
);
165 spin_lock_bh(&bat_priv
->tt_changes_list_lock
);
166 /* track the change in the OGMinterval list */
167 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt_changes_list
);
168 atomic_inc(&bat_priv
->tt_local_changes
);
169 spin_unlock_bh(&bat_priv
->tt_changes_list_lock
);
171 atomic_set(&bat_priv
->tt_ogm_append_cnt
, 0);
174 int batadv_tt_len(int changes_num
)
176 return changes_num
* sizeof(struct tt_change
);
179 static int tt_local_init(struct bat_priv
*bat_priv
)
181 if (bat_priv
->tt_local_hash
)
184 bat_priv
->tt_local_hash
= batadv_hash_new(1024);
186 if (!bat_priv
->tt_local_hash
)
192 void batadv_tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
195 struct bat_priv
*bat_priv
= netdev_priv(soft_iface
);
196 struct tt_local_entry
*tt_local_entry
= NULL
;
197 struct tt_global_entry
*tt_global_entry
= NULL
;
198 struct hlist_head
*head
;
199 struct hlist_node
*node
;
200 struct tt_orig_list_entry
*orig_entry
;
203 tt_local_entry
= tt_local_hash_find(bat_priv
, addr
);
205 if (tt_local_entry
) {
206 tt_local_entry
->last_seen
= jiffies
;
207 /* possibly unset the TT_CLIENT_PENDING flag */
208 tt_local_entry
->common
.flags
&= ~TT_CLIENT_PENDING
;
212 tt_local_entry
= kmalloc(sizeof(*tt_local_entry
), GFP_ATOMIC
);
216 bat_dbg(DBG_TT
, bat_priv
,
217 "Creating new local tt entry: %pM (ttvn: %d)\n", addr
,
218 (uint8_t)atomic_read(&bat_priv
->ttvn
));
220 memcpy(tt_local_entry
->common
.addr
, addr
, ETH_ALEN
);
221 tt_local_entry
->common
.flags
= NO_FLAGS
;
222 if (batadv_is_wifi_iface(ifindex
))
223 tt_local_entry
->common
.flags
|= TT_CLIENT_WIFI
;
224 atomic_set(&tt_local_entry
->common
.refcount
, 2);
225 tt_local_entry
->last_seen
= jiffies
;
227 /* the batman interface mac address should never be purged */
228 if (compare_eth(addr
, soft_iface
->dev_addr
))
229 tt_local_entry
->common
.flags
|= TT_CLIENT_NOPURGE
;
231 /* The local entry has to be marked as NEW to avoid to send it in
232 * a full table response going out before the next ttvn increment
233 * (consistency check)
235 tt_local_entry
->common
.flags
|= TT_CLIENT_NEW
;
237 hash_added
= hash_add(bat_priv
->tt_local_hash
, compare_tt
, choose_orig
,
238 &tt_local_entry
->common
,
239 &tt_local_entry
->common
.hash_entry
);
241 if (unlikely(hash_added
!= 0)) {
242 /* remove the reference for the hash */
243 tt_local_entry_free_ref(tt_local_entry
);
247 tt_local_event(bat_priv
, addr
, tt_local_entry
->common
.flags
);
249 /* remove address from global hash if present */
250 tt_global_entry
= tt_global_hash_find(bat_priv
, addr
);
252 /* Check whether it is a roaming! */
253 if (tt_global_entry
) {
254 /* These node are probably going to update their tt table */
255 head
= &tt_global_entry
->orig_list
;
257 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
258 orig_entry
->orig_node
->tt_poss_change
= true;
260 send_roam_adv(bat_priv
, tt_global_entry
->common
.addr
,
261 orig_entry
->orig_node
);
264 /* The global entry has to be marked as ROAMING and
265 * has to be kept for consistency purpose
267 tt_global_entry
->common
.flags
|= TT_CLIENT_ROAM
;
268 tt_global_entry
->roam_at
= jiffies
;
272 tt_local_entry_free_ref(tt_local_entry
);
274 tt_global_entry_free_ref(tt_global_entry
);
277 static void tt_realloc_packet_buff(unsigned char **packet_buff
,
278 int *packet_buff_len
, int min_packet_len
,
281 unsigned char *new_buff
;
283 new_buff
= kmalloc(new_packet_len
, GFP_ATOMIC
);
285 /* keep old buffer if kmalloc should fail */
287 memcpy(new_buff
, *packet_buff
, min_packet_len
);
289 *packet_buff
= new_buff
;
290 *packet_buff_len
= new_packet_len
;
294 static void tt_prepare_packet_buff(struct bat_priv
*bat_priv
,
295 unsigned char **packet_buff
,
296 int *packet_buff_len
, int min_packet_len
)
298 struct hard_iface
*primary_if
;
301 primary_if
= primary_if_get_selected(bat_priv
);
303 req_len
= min_packet_len
;
304 req_len
+= batadv_tt_len(atomic_read(&bat_priv
->tt_local_changes
));
306 /* if we have too many changes for one packet don't send any
307 * and wait for the tt table request which will be fragmented
309 if ((!primary_if
) || (req_len
> primary_if
->soft_iface
->mtu
))
310 req_len
= min_packet_len
;
312 tt_realloc_packet_buff(packet_buff
, packet_buff_len
,
313 min_packet_len
, req_len
);
316 hardif_free_ref(primary_if
);
319 static int tt_changes_fill_buff(struct bat_priv
*bat_priv
,
320 unsigned char **packet_buff
,
321 int *packet_buff_len
, int min_packet_len
)
323 struct tt_change_node
*entry
, *safe
;
324 int count
= 0, tot_changes
= 0, new_len
;
325 unsigned char *tt_buff
;
327 tt_prepare_packet_buff(bat_priv
, packet_buff
,
328 packet_buff_len
, min_packet_len
);
330 new_len
= *packet_buff_len
- min_packet_len
;
331 tt_buff
= *packet_buff
+ min_packet_len
;
334 tot_changes
= new_len
/ batadv_tt_len(1);
336 spin_lock_bh(&bat_priv
->tt_changes_list_lock
);
337 atomic_set(&bat_priv
->tt_local_changes
, 0);
339 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt_changes_list
,
341 if (count
< tot_changes
) {
342 memcpy(tt_buff
+ batadv_tt_len(count
),
343 &entry
->change
, sizeof(struct tt_change
));
346 list_del(&entry
->list
);
349 spin_unlock_bh(&bat_priv
->tt_changes_list_lock
);
351 /* Keep the buffer for possible tt_request */
352 spin_lock_bh(&bat_priv
->tt_buff_lock
);
353 kfree(bat_priv
->tt_buff
);
354 bat_priv
->tt_buff_len
= 0;
355 bat_priv
->tt_buff
= NULL
;
356 /* check whether this new OGM has no changes due to size problems */
358 /* if kmalloc() fails we will reply with the full table
359 * instead of providing the diff
361 bat_priv
->tt_buff
= kmalloc(new_len
, GFP_ATOMIC
);
362 if (bat_priv
->tt_buff
) {
363 memcpy(bat_priv
->tt_buff
, tt_buff
, new_len
);
364 bat_priv
->tt_buff_len
= new_len
;
367 spin_unlock_bh(&bat_priv
->tt_buff_lock
);
372 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
374 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
375 struct bat_priv
*bat_priv
= netdev_priv(net_dev
);
376 struct hashtable_t
*hash
= bat_priv
->tt_local_hash
;
377 struct tt_common_entry
*tt_common_entry
;
378 struct hard_iface
*primary_if
;
379 struct hlist_node
*node
;
380 struct hlist_head
*head
;
384 primary_if
= primary_if_get_selected(bat_priv
);
386 ret
= seq_printf(seq
,
387 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
392 if (primary_if
->if_status
!= IF_ACTIVE
) {
393 ret
= seq_printf(seq
,
394 "BATMAN mesh %s disabled - primary interface not active\n",
400 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
401 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->ttvn
));
403 for (i
= 0; i
< hash
->size
; i
++) {
404 head
= &hash
->table
[i
];
407 hlist_for_each_entry_rcu(tt_common_entry
, node
,
409 seq_printf(seq
, " * %pM [%c%c%c%c%c]\n",
410 tt_common_entry
->addr
,
411 (tt_common_entry
->flags
&
412 TT_CLIENT_ROAM
? 'R' : '.'),
413 (tt_common_entry
->flags
&
414 TT_CLIENT_NOPURGE
? 'P' : '.'),
415 (tt_common_entry
->flags
&
416 TT_CLIENT_NEW
? 'N' : '.'),
417 (tt_common_entry
->flags
&
418 TT_CLIENT_PENDING
? 'X' : '.'),
419 (tt_common_entry
->flags
&
420 TT_CLIENT_WIFI
? 'W' : '.'));
426 hardif_free_ref(primary_if
);
430 static void tt_local_set_pending(struct bat_priv
*bat_priv
,
431 struct tt_local_entry
*tt_local_entry
,
432 uint16_t flags
, const char *message
)
434 tt_local_event(bat_priv
, tt_local_entry
->common
.addr
,
435 tt_local_entry
->common
.flags
| flags
);
437 /* The local client has to be marked as "pending to be removed" but has
438 * to be kept in the table in order to send it in a full table
439 * 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 batadv_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 batadv_tt_global_add(struct bat_priv
*bat_priv
, struct orig_node
*orig_node
,
615 const unsigned char *tt_addr
, uint8_t ttvn
,
616 bool roaming
, bool wifi
)
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 batadv_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 batadv_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 batadv_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
*batadv_transtable_search(struct bat_priv
*bat_priv
,
1053 const uint8_t *addr
)
1055 struct tt_local_entry
*tt_local_entry
= NULL
;
1056 struct tt_global_entry
*tt_global_entry
= NULL
;
1057 struct orig_node
*orig_node
= NULL
;
1058 struct neigh_node
*router
= NULL
;
1059 struct hlist_head
*head
;
1060 struct hlist_node
*node
;
1061 struct tt_orig_list_entry
*orig_entry
;
1064 if (src
&& atomic_read(&bat_priv
->ap_isolation
)) {
1065 tt_local_entry
= tt_local_hash_find(bat_priv
, src
);
1066 if (!tt_local_entry
)
1070 tt_global_entry
= tt_global_hash_find(bat_priv
, addr
);
1071 if (!tt_global_entry
)
1074 /* check whether the clients should not communicate due to AP
1077 if (tt_local_entry
&& _is_ap_isolated(tt_local_entry
, tt_global_entry
))
1083 head
= &tt_global_entry
->orig_list
;
1084 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
1085 router
= batadv_orig_node_get_router(orig_entry
->orig_node
);
1089 if (router
->tq_avg
> best_tq
) {
1090 orig_node
= orig_entry
->orig_node
;
1091 best_tq
= router
->tq_avg
;
1093 batadv_neigh_node_free_ref(router
);
1095 /* found anything? */
1096 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1100 if (tt_global_entry
)
1101 tt_global_entry_free_ref(tt_global_entry
);
1103 tt_local_entry_free_ref(tt_local_entry
);
1108 /* Calculates the checksum of the local table of a given orig_node */
1109 static uint16_t tt_global_crc(struct bat_priv
*bat_priv
,
1110 struct orig_node
*orig_node
)
1112 uint16_t total
= 0, total_one
;
1113 struct hashtable_t
*hash
= bat_priv
->tt_global_hash
;
1114 struct tt_common_entry
*tt_common_entry
;
1115 struct tt_global_entry
*tt_global_entry
;
1116 struct hlist_node
*node
;
1117 struct hlist_head
*head
;
1121 for (i
= 0; i
< hash
->size
; i
++) {
1122 head
= &hash
->table
[i
];
1125 hlist_for_each_entry_rcu(tt_common_entry
, node
,
1127 tt_global_entry
= container_of(tt_common_entry
,
1128 struct tt_global_entry
,
1130 /* Roaming clients are in the global table for
1131 * consistency only. They don't have to be
1132 * taken into account while computing the
1135 if (tt_global_entry
->common
.flags
& TT_CLIENT_ROAM
)
1138 /* find out if this global entry is announced by this
1141 if (!tt_global_entry_has_orig(tt_global_entry
,
1146 for (j
= 0; j
< ETH_ALEN
; j
++)
1147 total_one
= crc16_byte(total_one
,
1148 tt_global_entry
->common
.addr
[j
]);
1157 /* Calculates the checksum of the local table */
1158 static uint16_t batadv_tt_local_crc(struct bat_priv
*bat_priv
)
1160 uint16_t total
= 0, total_one
;
1161 struct hashtable_t
*hash
= bat_priv
->tt_local_hash
;
1162 struct tt_common_entry
*tt_common_entry
;
1163 struct hlist_node
*node
;
1164 struct hlist_head
*head
;
1168 for (i
= 0; i
< hash
->size
; i
++) {
1169 head
= &hash
->table
[i
];
1172 hlist_for_each_entry_rcu(tt_common_entry
, node
,
1174 /* not yet committed clients have not to be taken into
1175 * account while computing the CRC
1177 if (tt_common_entry
->flags
& TT_CLIENT_NEW
)
1180 for (j
= 0; j
< ETH_ALEN
; j
++)
1181 total_one
= crc16_byte(total_one
,
1182 tt_common_entry
->addr
[j
]);
1191 static void tt_req_list_free(struct bat_priv
*bat_priv
)
1193 struct tt_req_node
*node
, *safe
;
1195 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1197 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_req_list
, list
) {
1198 list_del(&node
->list
);
1202 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1205 static void tt_save_orig_buffer(struct bat_priv
*bat_priv
,
1206 struct orig_node
*orig_node
,
1207 const unsigned char *tt_buff
,
1208 uint8_t tt_num_changes
)
1210 uint16_t tt_buff_len
= batadv_tt_len(tt_num_changes
);
1212 /* Replace the old buffer only if I received something in the
1213 * last OGM (the OGM could carry no changes)
1215 spin_lock_bh(&orig_node
->tt_buff_lock
);
1216 if (tt_buff_len
> 0) {
1217 kfree(orig_node
->tt_buff
);
1218 orig_node
->tt_buff_len
= 0;
1219 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
1220 if (orig_node
->tt_buff
) {
1221 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
1222 orig_node
->tt_buff_len
= tt_buff_len
;
1225 spin_unlock_bh(&orig_node
->tt_buff_lock
);
1228 static void tt_req_purge(struct bat_priv
*bat_priv
)
1230 struct tt_req_node
*node
, *safe
;
1232 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1233 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_req_list
, list
) {
1234 if (has_timed_out(node
->issued_at
, TT_REQUEST_TIMEOUT
)) {
1235 list_del(&node
->list
);
1239 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1242 /* returns the pointer to the new tt_req_node struct if no request
1243 * has already been issued for this orig_node, NULL otherwise
1245 static struct tt_req_node
*new_tt_req_node(struct bat_priv
*bat_priv
,
1246 struct orig_node
*orig_node
)
1248 struct tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
1250 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1251 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt_req_list
, list
) {
1252 if (compare_eth(tt_req_node_tmp
, orig_node
) &&
1253 !has_timed_out(tt_req_node_tmp
->issued_at
,
1254 TT_REQUEST_TIMEOUT
))
1258 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
1262 memcpy(tt_req_node
->addr
, orig_node
->orig
, ETH_ALEN
);
1263 tt_req_node
->issued_at
= jiffies
;
1265 list_add(&tt_req_node
->list
, &bat_priv
->tt_req_list
);
1267 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1271 /* data_ptr is useless here, but has to be kept to respect the prototype */
1272 static int tt_local_valid_entry(const void *entry_ptr
, const void *data_ptr
)
1274 const struct tt_common_entry
*tt_common_entry
= entry_ptr
;
1276 if (tt_common_entry
->flags
& TT_CLIENT_NEW
)
1281 static int tt_global_valid_entry(const void *entry_ptr
, const void *data_ptr
)
1283 const struct tt_common_entry
*tt_common_entry
= entry_ptr
;
1284 const struct tt_global_entry
*tt_global_entry
;
1285 const struct orig_node
*orig_node
= data_ptr
;
1287 if (tt_common_entry
->flags
& TT_CLIENT_ROAM
)
1290 tt_global_entry
= container_of(tt_common_entry
, struct tt_global_entry
,
1293 return tt_global_entry_has_orig(tt_global_entry
, orig_node
);
1296 static struct sk_buff
*tt_response_fill_table(uint16_t tt_len
, uint8_t ttvn
,
1297 struct hashtable_t
*hash
,
1298 struct hard_iface
*primary_if
,
1299 int (*valid_cb
)(const void *,
1303 struct tt_common_entry
*tt_common_entry
;
1304 struct tt_query_packet
*tt_response
;
1305 struct tt_change
*tt_change
;
1306 struct hlist_node
*node
;
1307 struct hlist_head
*head
;
1308 struct sk_buff
*skb
= NULL
;
1309 uint16_t tt_tot
, tt_count
;
1310 ssize_t tt_query_size
= sizeof(struct tt_query_packet
);
1313 if (tt_query_size
+ tt_len
> primary_if
->soft_iface
->mtu
) {
1314 tt_len
= primary_if
->soft_iface
->mtu
- tt_query_size
;
1315 tt_len
-= tt_len
% sizeof(struct tt_change
);
1317 tt_tot
= tt_len
/ sizeof(struct tt_change
);
1319 skb
= dev_alloc_skb(tt_query_size
+ tt_len
+ ETH_HLEN
);
1323 skb_reserve(skb
, ETH_HLEN
);
1324 tt_response
= (struct tt_query_packet
*)skb_put(skb
,
1325 tt_query_size
+ tt_len
);
1326 tt_response
->ttvn
= ttvn
;
1328 tt_change
= (struct tt_change
*)(skb
->data
+ tt_query_size
);
1332 for (i
= 0; i
< hash
->size
; i
++) {
1333 head
= &hash
->table
[i
];
1335 hlist_for_each_entry_rcu(tt_common_entry
, node
,
1337 if (tt_count
== tt_tot
)
1340 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
1343 memcpy(tt_change
->addr
, tt_common_entry
->addr
,
1345 tt_change
->flags
= NO_FLAGS
;
1353 /* store in the message the number of entries we have successfully
1356 tt_response
->tt_data
= htons(tt_count
);
1362 static int send_tt_request(struct bat_priv
*bat_priv
,
1363 struct orig_node
*dst_orig_node
,
1364 uint8_t ttvn
, uint16_t tt_crc
, bool full_table
)
1366 struct sk_buff
*skb
= NULL
;
1367 struct tt_query_packet
*tt_request
;
1368 struct neigh_node
*neigh_node
= NULL
;
1369 struct hard_iface
*primary_if
;
1370 struct tt_req_node
*tt_req_node
= NULL
;
1373 primary_if
= primary_if_get_selected(bat_priv
);
1377 /* The new tt_req will be issued only if I'm not waiting for a
1378 * reply from the same orig_node yet
1380 tt_req_node
= new_tt_req_node(bat_priv
, dst_orig_node
);
1384 skb
= dev_alloc_skb(sizeof(struct tt_query_packet
) + ETH_HLEN
);
1388 skb_reserve(skb
, ETH_HLEN
);
1390 tt_request
= (struct tt_query_packet
*)skb_put(skb
,
1391 sizeof(struct tt_query_packet
));
1393 tt_request
->header
.packet_type
= BAT_TT_QUERY
;
1394 tt_request
->header
.version
= COMPAT_VERSION
;
1395 memcpy(tt_request
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1396 memcpy(tt_request
->dst
, dst_orig_node
->orig
, ETH_ALEN
);
1397 tt_request
->header
.ttl
= TTL
;
1398 tt_request
->ttvn
= ttvn
;
1399 tt_request
->tt_data
= htons(tt_crc
);
1400 tt_request
->flags
= TT_REQUEST
;
1403 tt_request
->flags
|= TT_FULL_TABLE
;
1405 neigh_node
= batadv_orig_node_get_router(dst_orig_node
);
1409 bat_dbg(DBG_TT
, bat_priv
,
1410 "Sending TT_REQUEST to %pM via %pM [%c]\n",
1411 dst_orig_node
->orig
, neigh_node
->addr
,
1412 (full_table
? 'F' : '.'));
1414 batadv_inc_counter(bat_priv
, BAT_CNT_TT_REQUEST_TX
);
1416 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
1421 batadv_neigh_node_free_ref(neigh_node
);
1423 hardif_free_ref(primary_if
);
1426 if (ret
&& tt_req_node
) {
1427 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1428 list_del(&tt_req_node
->list
);
1429 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1435 static bool send_other_tt_response(struct bat_priv
*bat_priv
,
1436 struct tt_query_packet
*tt_request
)
1438 struct orig_node
*req_dst_orig_node
= NULL
, *res_dst_orig_node
= NULL
;
1439 struct neigh_node
*neigh_node
= NULL
;
1440 struct hard_iface
*primary_if
= NULL
;
1441 uint8_t orig_ttvn
, req_ttvn
, ttvn
;
1443 unsigned char *tt_buff
;
1445 uint16_t tt_len
, tt_tot
;
1446 struct sk_buff
*skb
= NULL
;
1447 struct tt_query_packet
*tt_response
;
1449 bat_dbg(DBG_TT
, bat_priv
,
1450 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1451 tt_request
->src
, tt_request
->ttvn
, tt_request
->dst
,
1452 (tt_request
->flags
& TT_FULL_TABLE
? 'F' : '.'));
1454 /* Let's get the orig node of the REAL destination */
1455 req_dst_orig_node
= orig_hash_find(bat_priv
, tt_request
->dst
);
1456 if (!req_dst_orig_node
)
1459 res_dst_orig_node
= orig_hash_find(bat_priv
, tt_request
->src
);
1460 if (!res_dst_orig_node
)
1463 neigh_node
= batadv_orig_node_get_router(res_dst_orig_node
);
1467 primary_if
= primary_if_get_selected(bat_priv
);
1471 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
1472 req_ttvn
= tt_request
->ttvn
;
1474 /* I don't have the requested data */
1475 if (orig_ttvn
!= req_ttvn
||
1476 tt_request
->tt_data
!= htons(req_dst_orig_node
->tt_crc
))
1479 /* If the full table has been explicitly requested */
1480 if (tt_request
->flags
& TT_FULL_TABLE
||
1481 !req_dst_orig_node
->tt_buff
)
1486 /* In this version, fragmentation is not implemented, then
1487 * I'll send only one packet with as much TT entries as I can
1490 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
1491 tt_len
= req_dst_orig_node
->tt_buff_len
;
1492 tt_tot
= tt_len
/ sizeof(struct tt_change
);
1494 skb
= dev_alloc_skb(sizeof(struct tt_query_packet
) +
1499 skb_reserve(skb
, ETH_HLEN
);
1500 tt_response
= (struct tt_query_packet
*)skb_put(skb
,
1501 sizeof(struct tt_query_packet
) + tt_len
);
1502 tt_response
->ttvn
= req_ttvn
;
1503 tt_response
->tt_data
= htons(tt_tot
);
1505 tt_buff
= skb
->data
+ sizeof(struct tt_query_packet
);
1506 /* Copy the last orig_node's OGM buffer */
1507 memcpy(tt_buff
, req_dst_orig_node
->tt_buff
,
1508 req_dst_orig_node
->tt_buff_len
);
1510 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
1512 tt_len
= (uint16_t)atomic_read(&req_dst_orig_node
->tt_size
) *
1513 sizeof(struct tt_change
);
1514 ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
1516 skb
= tt_response_fill_table(tt_len
, ttvn
,
1517 bat_priv
->tt_global_hash
,
1518 primary_if
, tt_global_valid_entry
,
1523 tt_response
= (struct tt_query_packet
*)skb
->data
;
1526 tt_response
->header
.packet_type
= BAT_TT_QUERY
;
1527 tt_response
->header
.version
= COMPAT_VERSION
;
1528 tt_response
->header
.ttl
= TTL
;
1529 memcpy(tt_response
->src
, req_dst_orig_node
->orig
, ETH_ALEN
);
1530 memcpy(tt_response
->dst
, tt_request
->src
, ETH_ALEN
);
1531 tt_response
->flags
= TT_RESPONSE
;
1534 tt_response
->flags
|= TT_FULL_TABLE
;
1536 bat_dbg(DBG_TT
, bat_priv
,
1537 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1538 res_dst_orig_node
->orig
, neigh_node
->addr
,
1539 req_dst_orig_node
->orig
, req_ttvn
);
1541 batadv_inc_counter(bat_priv
, BAT_CNT_TT_RESPONSE_TX
);
1543 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
1548 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
1551 if (res_dst_orig_node
)
1552 batadv_orig_node_free_ref(res_dst_orig_node
);
1553 if (req_dst_orig_node
)
1554 batadv_orig_node_free_ref(req_dst_orig_node
);
1556 batadv_neigh_node_free_ref(neigh_node
);
1558 hardif_free_ref(primary_if
);
1564 static bool send_my_tt_response(struct bat_priv
*bat_priv
,
1565 struct tt_query_packet
*tt_request
)
1567 struct orig_node
*orig_node
= NULL
;
1568 struct neigh_node
*neigh_node
= NULL
;
1569 struct hard_iface
*primary_if
= NULL
;
1570 uint8_t my_ttvn
, req_ttvn
, ttvn
;
1572 unsigned char *tt_buff
;
1574 uint16_t tt_len
, tt_tot
;
1575 struct sk_buff
*skb
= NULL
;
1576 struct tt_query_packet
*tt_response
;
1578 bat_dbg(DBG_TT
, bat_priv
,
1579 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1580 tt_request
->src
, tt_request
->ttvn
,
1581 (tt_request
->flags
& TT_FULL_TABLE
? 'F' : '.'));
1584 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->ttvn
);
1585 req_ttvn
= tt_request
->ttvn
;
1587 orig_node
= orig_hash_find(bat_priv
, tt_request
->src
);
1591 neigh_node
= batadv_orig_node_get_router(orig_node
);
1595 primary_if
= primary_if_get_selected(bat_priv
);
1599 /* If the full table has been explicitly requested or the gap
1600 * is too big send the whole local translation table
1602 if (tt_request
->flags
& TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
1608 /* In this version, fragmentation is not implemented, then
1609 * I'll send only one packet with as much TT entries as I can
1612 spin_lock_bh(&bat_priv
->tt_buff_lock
);
1613 tt_len
= bat_priv
->tt_buff_len
;
1614 tt_tot
= tt_len
/ sizeof(struct tt_change
);
1616 skb
= dev_alloc_skb(sizeof(struct tt_query_packet
) +
1621 skb_reserve(skb
, ETH_HLEN
);
1622 tt_response
= (struct tt_query_packet
*)skb_put(skb
,
1623 sizeof(struct tt_query_packet
) + tt_len
);
1624 tt_response
->ttvn
= req_ttvn
;
1625 tt_response
->tt_data
= htons(tt_tot
);
1627 tt_buff
= skb
->data
+ sizeof(struct tt_query_packet
);
1628 memcpy(tt_buff
, bat_priv
->tt_buff
,
1629 bat_priv
->tt_buff_len
);
1630 spin_unlock_bh(&bat_priv
->tt_buff_lock
);
1632 tt_len
= (uint16_t)atomic_read(&bat_priv
->num_local_tt
) *
1633 sizeof(struct tt_change
);
1634 ttvn
= (uint8_t)atomic_read(&bat_priv
->ttvn
);
1636 skb
= tt_response_fill_table(tt_len
, ttvn
,
1637 bat_priv
->tt_local_hash
,
1638 primary_if
, tt_local_valid_entry
,
1643 tt_response
= (struct tt_query_packet
*)skb
->data
;
1646 tt_response
->header
.packet_type
= BAT_TT_QUERY
;
1647 tt_response
->header
.version
= COMPAT_VERSION
;
1648 tt_response
->header
.ttl
= TTL
;
1649 memcpy(tt_response
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1650 memcpy(tt_response
->dst
, tt_request
->src
, ETH_ALEN
);
1651 tt_response
->flags
= TT_RESPONSE
;
1654 tt_response
->flags
|= TT_FULL_TABLE
;
1656 bat_dbg(DBG_TT
, bat_priv
,
1657 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1658 orig_node
->orig
, neigh_node
->addr
,
1659 (tt_response
->flags
& TT_FULL_TABLE
? 'F' : '.'));
1661 batadv_inc_counter(bat_priv
, BAT_CNT_TT_RESPONSE_TX
);
1663 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
1668 spin_unlock_bh(&bat_priv
->tt_buff_lock
);
1671 batadv_orig_node_free_ref(orig_node
);
1673 batadv_neigh_node_free_ref(neigh_node
);
1675 hardif_free_ref(primary_if
);
1678 /* This packet was for me, so it doesn't need to be re-routed */
1682 bool batadv_send_tt_response(struct bat_priv
*bat_priv
,
1683 struct tt_query_packet
*tt_request
)
1685 if (batadv_is_my_mac(tt_request
->dst
)) {
1686 /* don't answer backbone gws! */
1687 if (batadv_bla_is_backbone_gw_orig(bat_priv
, tt_request
->src
))
1690 return send_my_tt_response(bat_priv
, tt_request
);
1692 return send_other_tt_response(bat_priv
, tt_request
);
1696 static void _tt_update_changes(struct bat_priv
*bat_priv
,
1697 struct orig_node
*orig_node
,
1698 struct tt_change
*tt_change
,
1699 uint16_t tt_num_changes
, uint8_t ttvn
)
1704 for (i
= 0; i
< tt_num_changes
; i
++) {
1705 if ((tt_change
+ i
)->flags
& TT_CLIENT_DEL
) {
1706 tt_global_del(bat_priv
, orig_node
,
1707 (tt_change
+ i
)->addr
,
1708 "tt removed by changes",
1709 (tt_change
+ i
)->flags
& TT_CLIENT_ROAM
);
1711 is_wifi
= (tt_change
+ i
)->flags
& TT_CLIENT_WIFI
;
1712 if (!batadv_tt_global_add(bat_priv
, orig_node
,
1713 (tt_change
+ i
)->addr
, ttvn
,
1715 /* In case of problem while storing a
1716 * global_entry, we stop the updating
1717 * procedure without committing the
1718 * ttvn change. This will avoid to send
1719 * corrupted data on tt_request
1724 orig_node
->tt_initialised
= true;
1727 static void tt_fill_gtable(struct bat_priv
*bat_priv
,
1728 struct tt_query_packet
*tt_response
)
1730 struct orig_node
*orig_node
= NULL
;
1732 orig_node
= orig_hash_find(bat_priv
, tt_response
->src
);
1736 /* Purge the old table first.. */
1737 batadv_tt_global_del_orig(bat_priv
, orig_node
, "Received full table");
1739 _tt_update_changes(bat_priv
, orig_node
,
1740 (struct tt_change
*)(tt_response
+ 1),
1741 ntohs(tt_response
->tt_data
), tt_response
->ttvn
);
1743 spin_lock_bh(&orig_node
->tt_buff_lock
);
1744 kfree(orig_node
->tt_buff
);
1745 orig_node
->tt_buff_len
= 0;
1746 orig_node
->tt_buff
= NULL
;
1747 spin_unlock_bh(&orig_node
->tt_buff_lock
);
1749 atomic_set(&orig_node
->last_ttvn
, tt_response
->ttvn
);
1753 batadv_orig_node_free_ref(orig_node
);
1756 static void tt_update_changes(struct bat_priv
*bat_priv
,
1757 struct orig_node
*orig_node
,
1758 uint16_t tt_num_changes
, uint8_t ttvn
,
1759 struct tt_change
*tt_change
)
1761 _tt_update_changes(bat_priv
, orig_node
, tt_change
, tt_num_changes
,
1764 tt_save_orig_buffer(bat_priv
, orig_node
, (unsigned char *)tt_change
,
1766 atomic_set(&orig_node
->last_ttvn
, ttvn
);
1769 bool batadv_is_my_client(struct bat_priv
*bat_priv
, const uint8_t *addr
)
1771 struct tt_local_entry
*tt_local_entry
= NULL
;
1774 tt_local_entry
= tt_local_hash_find(bat_priv
, addr
);
1775 if (!tt_local_entry
)
1777 /* Check if the client has been logically deleted (but is kept for
1778 * consistency purpose)
1780 if (tt_local_entry
->common
.flags
& TT_CLIENT_PENDING
)
1785 tt_local_entry_free_ref(tt_local_entry
);
1789 void batadv_handle_tt_response(struct bat_priv
*bat_priv
,
1790 struct tt_query_packet
*tt_response
)
1792 struct tt_req_node
*node
, *safe
;
1793 struct orig_node
*orig_node
= NULL
;
1795 bat_dbg(DBG_TT
, bat_priv
,
1796 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
1797 tt_response
->src
, tt_response
->ttvn
,
1798 ntohs(tt_response
->tt_data
),
1799 (tt_response
->flags
& TT_FULL_TABLE
? 'F' : '.'));
1801 /* we should have never asked a backbone gw */
1802 if (batadv_bla_is_backbone_gw_orig(bat_priv
, tt_response
->src
))
1805 orig_node
= orig_hash_find(bat_priv
, tt_response
->src
);
1809 if (tt_response
->flags
& TT_FULL_TABLE
)
1810 tt_fill_gtable(bat_priv
, tt_response
);
1812 tt_update_changes(bat_priv
, orig_node
,
1813 ntohs(tt_response
->tt_data
),
1815 (struct tt_change
*)(tt_response
+ 1));
1817 /* Delete the tt_req_node from pending tt_requests list */
1818 spin_lock_bh(&bat_priv
->tt_req_list_lock
);
1819 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_req_list
, list
) {
1820 if (!compare_eth(node
->addr
, tt_response
->src
))
1822 list_del(&node
->list
);
1825 spin_unlock_bh(&bat_priv
->tt_req_list_lock
);
1827 /* Recalculate the CRC for this orig_node and store it */
1828 orig_node
->tt_crc
= tt_global_crc(bat_priv
, orig_node
);
1829 /* Roaming phase is over: tables are in sync again. I can
1832 orig_node
->tt_poss_change
= false;
1835 batadv_orig_node_free_ref(orig_node
);
1838 int batadv_tt_init(struct bat_priv
*bat_priv
)
1842 ret
= tt_local_init(bat_priv
);
1846 ret
= tt_global_init(bat_priv
);
1850 tt_start_timer(bat_priv
);
1855 static void tt_roam_list_free(struct bat_priv
*bat_priv
)
1857 struct tt_roam_node
*node
, *safe
;
1859 spin_lock_bh(&bat_priv
->tt_roam_list_lock
);
1861 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_roam_list
, list
) {
1862 list_del(&node
->list
);
1866 spin_unlock_bh(&bat_priv
->tt_roam_list_lock
);
1869 static void tt_roam_purge(struct bat_priv
*bat_priv
)
1871 struct tt_roam_node
*node
, *safe
;
1873 spin_lock_bh(&bat_priv
->tt_roam_list_lock
);
1874 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt_roam_list
, list
) {
1875 if (!has_timed_out(node
->first_time
, ROAMING_MAX_TIME
))
1878 list_del(&node
->list
);
1881 spin_unlock_bh(&bat_priv
->tt_roam_list_lock
);
1884 /* This function checks whether the client already reached the
1885 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1888 * returns true if the ROAMING_ADV can be sent, false otherwise
1890 static bool tt_check_roam_count(struct bat_priv
*bat_priv
,
1893 struct tt_roam_node
*tt_roam_node
;
1896 spin_lock_bh(&bat_priv
->tt_roam_list_lock
);
1897 /* The new tt_req will be issued only if I'm not waiting for a
1898 * reply from the same orig_node yet
1900 list_for_each_entry(tt_roam_node
, &bat_priv
->tt_roam_list
, list
) {
1901 if (!compare_eth(tt_roam_node
->addr
, client
))
1904 if (has_timed_out(tt_roam_node
->first_time
, ROAMING_MAX_TIME
))
1907 if (!atomic_dec_not_zero(&tt_roam_node
->counter
))
1908 /* Sorry, you roamed too many times! */
1915 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
1919 tt_roam_node
->first_time
= jiffies
;
1920 atomic_set(&tt_roam_node
->counter
, ROAMING_MAX_COUNT
- 1);
1921 memcpy(tt_roam_node
->addr
, client
, ETH_ALEN
);
1923 list_add(&tt_roam_node
->list
, &bat_priv
->tt_roam_list
);
1928 spin_unlock_bh(&bat_priv
->tt_roam_list_lock
);
1932 static void send_roam_adv(struct bat_priv
*bat_priv
, uint8_t *client
,
1933 struct orig_node
*orig_node
)
1935 struct neigh_node
*neigh_node
= NULL
;
1936 struct sk_buff
*skb
= NULL
;
1937 struct roam_adv_packet
*roam_adv_packet
;
1939 struct hard_iface
*primary_if
;
1941 /* before going on we have to check whether the client has
1942 * already roamed to us too many times
1944 if (!tt_check_roam_count(bat_priv
, client
))
1947 skb
= dev_alloc_skb(sizeof(struct roam_adv_packet
) + ETH_HLEN
);
1951 skb_reserve(skb
, ETH_HLEN
);
1953 roam_adv_packet
= (struct roam_adv_packet
*)skb_put(skb
,
1954 sizeof(struct roam_adv_packet
));
1956 roam_adv_packet
->header
.packet_type
= BAT_ROAM_ADV
;
1957 roam_adv_packet
->header
.version
= COMPAT_VERSION
;
1958 roam_adv_packet
->header
.ttl
= TTL
;
1959 primary_if
= primary_if_get_selected(bat_priv
);
1962 memcpy(roam_adv_packet
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1963 hardif_free_ref(primary_if
);
1964 memcpy(roam_adv_packet
->dst
, orig_node
->orig
, ETH_ALEN
);
1965 memcpy(roam_adv_packet
->client
, client
, ETH_ALEN
);
1967 neigh_node
= batadv_orig_node_get_router(orig_node
);
1971 bat_dbg(DBG_TT
, bat_priv
,
1972 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1973 orig_node
->orig
, client
, neigh_node
->addr
);
1975 batadv_inc_counter(bat_priv
, BAT_CNT_TT_ROAM_ADV_TX
);
1977 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
1982 batadv_neigh_node_free_ref(neigh_node
);
1988 static void tt_purge(struct work_struct
*work
)
1990 struct delayed_work
*delayed_work
=
1991 container_of(work
, struct delayed_work
, work
);
1992 struct bat_priv
*bat_priv
=
1993 container_of(delayed_work
, struct bat_priv
, tt_work
);
1995 tt_local_purge(bat_priv
);
1996 tt_global_roam_purge(bat_priv
);
1997 tt_req_purge(bat_priv
);
1998 tt_roam_purge(bat_priv
);
2000 tt_start_timer(bat_priv
);
2003 void batadv_tt_free(struct bat_priv
*bat_priv
)
2005 cancel_delayed_work_sync(&bat_priv
->tt_work
);
2007 tt_local_table_free(bat_priv
);
2008 tt_global_table_free(bat_priv
);
2009 tt_req_list_free(bat_priv
);
2010 tt_changes_list_free(bat_priv
);
2011 tt_roam_list_free(bat_priv
);
2013 kfree(bat_priv
->tt_buff
);
2016 /* This function will enable or disable the specified flags for all the entries
2017 * in the given hash table and returns the number of modified entries
2019 static uint16_t tt_set_flags(struct hashtable_t
*hash
, uint16_t flags
,
2023 uint16_t changed_num
= 0;
2024 struct hlist_head
*head
;
2025 struct hlist_node
*node
;
2026 struct tt_common_entry
*tt_common_entry
;
2031 for (i
= 0; i
< hash
->size
; i
++) {
2032 head
= &hash
->table
[i
];
2035 hlist_for_each_entry_rcu(tt_common_entry
, node
,
2038 if ((tt_common_entry
->flags
& flags
) == flags
)
2040 tt_common_entry
->flags
|= flags
;
2042 if (!(tt_common_entry
->flags
& flags
))
2044 tt_common_entry
->flags
&= ~flags
;
2054 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
2055 static void tt_local_purge_pending_clients(struct bat_priv
*bat_priv
)
2057 struct hashtable_t
*hash
= bat_priv
->tt_local_hash
;
2058 struct tt_common_entry
*tt_common_entry
;
2059 struct tt_local_entry
*tt_local_entry
;
2060 struct hlist_node
*node
, *node_tmp
;
2061 struct hlist_head
*head
;
2062 spinlock_t
*list_lock
; /* protects write access to the hash lists */
2068 for (i
= 0; i
< hash
->size
; i
++) {
2069 head
= &hash
->table
[i
];
2070 list_lock
= &hash
->list_locks
[i
];
2072 spin_lock_bh(list_lock
);
2073 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
,
2075 if (!(tt_common_entry
->flags
& TT_CLIENT_PENDING
))
2078 bat_dbg(DBG_TT
, bat_priv
,
2079 "Deleting local tt entry (%pM): pending\n",
2080 tt_common_entry
->addr
);
2082 atomic_dec(&bat_priv
->num_local_tt
);
2083 hlist_del_rcu(node
);
2084 tt_local_entry
= container_of(tt_common_entry
,
2085 struct tt_local_entry
,
2087 tt_local_entry_free_ref(tt_local_entry
);
2089 spin_unlock_bh(list_lock
);
2094 static int tt_commit_changes(struct bat_priv
*bat_priv
,
2095 unsigned char **packet_buff
, int *packet_buff_len
,
2098 uint16_t changed_num
= 0;
2100 if (atomic_read(&bat_priv
->tt_local_changes
) < 1)
2103 changed_num
= tt_set_flags(bat_priv
->tt_local_hash
,
2104 TT_CLIENT_NEW
, false);
2106 /* all reset entries have to be counted as local entries */
2107 atomic_add(changed_num
, &bat_priv
->num_local_tt
);
2108 tt_local_purge_pending_clients(bat_priv
);
2109 bat_priv
->tt_crc
= batadv_tt_local_crc(bat_priv
);
2111 /* Increment the TTVN only once per OGM interval */
2112 atomic_inc(&bat_priv
->ttvn
);
2113 bat_dbg(DBG_TT
, bat_priv
, "Local changes committed, updating to ttvn %u\n",
2114 (uint8_t)atomic_read(&bat_priv
->ttvn
));
2115 bat_priv
->tt_poss_change
= false;
2117 /* reset the sending counter */
2118 atomic_set(&bat_priv
->tt_ogm_append_cnt
, TT_OGM_APPEND_MAX
);
2120 return tt_changes_fill_buff(bat_priv
, packet_buff
,
2121 packet_buff_len
, packet_min_len
);
2124 /* when calling this function (hard_iface == primary_if) has to be true */
2125 int batadv_tt_append_diff(struct bat_priv
*bat_priv
,
2126 unsigned char **packet_buff
, int *packet_buff_len
,
2131 /* if at least one change happened */
2132 tt_num_changes
= tt_commit_changes(bat_priv
, packet_buff
,
2133 packet_buff_len
, packet_min_len
);
2135 /* if the changes have been sent often enough */
2136 if ((tt_num_changes
< 0) &&
2137 (!atomic_dec_not_zero(&bat_priv
->tt_ogm_append_cnt
))) {
2138 tt_realloc_packet_buff(packet_buff
, packet_buff_len
,
2139 packet_min_len
, packet_min_len
);
2143 return tt_num_changes
;
2146 bool batadv_is_ap_isolated(struct bat_priv
*bat_priv
, uint8_t *src
,
2149 struct tt_local_entry
*tt_local_entry
= NULL
;
2150 struct tt_global_entry
*tt_global_entry
= NULL
;
2153 if (!atomic_read(&bat_priv
->ap_isolation
))
2156 tt_local_entry
= tt_local_hash_find(bat_priv
, dst
);
2157 if (!tt_local_entry
)
2160 tt_global_entry
= tt_global_hash_find(bat_priv
, src
);
2161 if (!tt_global_entry
)
2164 if (_is_ap_isolated(tt_local_entry
, tt_global_entry
))
2170 if (tt_global_entry
)
2171 tt_global_entry_free_ref(tt_global_entry
);
2173 tt_local_entry_free_ref(tt_local_entry
);
2177 void batadv_tt_update_orig(struct bat_priv
*bat_priv
,
2178 struct orig_node
*orig_node
,
2179 const unsigned char *tt_buff
, uint8_t tt_num_changes
,
2180 uint8_t ttvn
, uint16_t tt_crc
)
2182 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
2183 bool full_table
= true;
2185 /* don't care about a backbone gateways updates. */
2186 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
2189 /* orig table not initialised AND first diff is in the OGM OR the ttvn
2190 * increased by one -> we can apply the attached changes
2192 if ((!orig_node
->tt_initialised
&& ttvn
== 1) ||
2193 ttvn
- orig_ttvn
== 1) {
2194 /* the OGM could not contain the changes due to their size or
2195 * because they have already been sent TT_OGM_APPEND_MAX times.
2196 * In this case send a tt request
2198 if (!tt_num_changes
) {
2203 tt_update_changes(bat_priv
, orig_node
, tt_num_changes
, ttvn
,
2204 (struct tt_change
*)tt_buff
);
2206 /* Even if we received the precomputed crc with the OGM, we
2207 * prefer to recompute it to spot any possible inconsistency
2208 * in the global table
2210 orig_node
->tt_crc
= tt_global_crc(bat_priv
, orig_node
);
2212 /* The ttvn alone is not enough to guarantee consistency
2213 * because a single value could represent different states
2214 * (due to the wrap around). Thus a node has to check whether
2215 * the resulting table (after applying the changes) is still
2216 * consistent or not. E.g. a node could disconnect while its
2217 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2218 * checking the CRC value is mandatory to detect the
2221 if (orig_node
->tt_crc
!= tt_crc
)
2224 /* Roaming phase is over: tables are in sync again. I can
2227 orig_node
->tt_poss_change
= false;
2229 /* if we missed more than one change or our tables are not
2230 * in sync anymore -> request fresh tt data
2232 if (!orig_node
->tt_initialised
|| ttvn
!= orig_ttvn
||
2233 orig_node
->tt_crc
!= tt_crc
) {
2235 bat_dbg(DBG_TT
, bat_priv
,
2236 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2237 orig_node
->orig
, ttvn
, orig_ttvn
, tt_crc
,
2238 orig_node
->tt_crc
, tt_num_changes
);
2239 send_tt_request(bat_priv
, orig_node
, ttvn
, tt_crc
,
2246 /* returns true whether we know that the client has moved from its old
2247 * originator to another one. This entry is kept is still kept for consistency
2250 bool batadv_tt_global_client_is_roaming(struct bat_priv
*bat_priv
,
2253 struct tt_global_entry
*tt_global_entry
;
2256 tt_global_entry
= tt_global_hash_find(bat_priv
, addr
);
2257 if (!tt_global_entry
)
2260 ret
= tt_global_entry
->common
.flags
& TT_CLIENT_ROAM
;
2261 tt_global_entry_free_ref(tt_global_entry
);