1 /* Copyright (C) 2007-2013 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>
33 static struct lock_class_key batadv_tt_local_hash_lock_class_key
;
34 static struct lock_class_key batadv_tt_global_hash_lock_class_key
;
36 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
37 struct batadv_orig_node
*orig_node
);
38 static void batadv_tt_purge(struct work_struct
*work
);
40 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
);
41 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
42 struct batadv_orig_node
*orig_node
,
43 const unsigned char *addr
,
44 const char *message
, bool roaming
);
46 /* returns 1 if they are the same mac addr */
47 static int batadv_compare_tt(const struct hlist_node
*node
, const void *data2
)
49 const void *data1
= container_of(node
, struct batadv_tt_common_entry
,
52 return (memcmp(data1
, data2
, ETH_ALEN
) == 0 ? 1 : 0);
55 static struct batadv_tt_common_entry
*
56 batadv_tt_hash_find(struct batadv_hashtable
*hash
, const void *data
)
58 struct hlist_head
*head
;
59 struct batadv_tt_common_entry
*tt_common_entry
;
60 struct batadv_tt_common_entry
*tt_common_entry_tmp
= NULL
;
66 index
= batadv_choose_orig(data
, hash
->size
);
67 head
= &hash
->table
[index
];
70 hlist_for_each_entry_rcu(tt_common_entry
, head
, hash_entry
) {
71 if (!batadv_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 batadv_tt_local_entry
*
86 batadv_tt_local_hash_find(struct batadv_priv
*bat_priv
, const void *data
)
88 struct batadv_tt_common_entry
*tt_common_entry
;
89 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
91 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.local_hash
, data
);
93 tt_local_entry
= container_of(tt_common_entry
,
94 struct batadv_tt_local_entry
,
96 return tt_local_entry
;
99 static struct batadv_tt_global_entry
*
100 batadv_tt_global_hash_find(struct batadv_priv
*bat_priv
, const void *data
)
102 struct batadv_tt_common_entry
*tt_common_entry
;
103 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
105 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.global_hash
, data
);
107 tt_global_entry
= container_of(tt_common_entry
,
108 struct batadv_tt_global_entry
,
110 return tt_global_entry
;
114 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry
*tt_local_entry
)
116 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
117 kfree_rcu(tt_local_entry
, common
.rcu
);
120 static void batadv_tt_global_entry_free_rcu(struct rcu_head
*rcu
)
122 struct batadv_tt_common_entry
*tt_common_entry
;
123 struct batadv_tt_global_entry
*tt_global_entry
;
125 tt_common_entry
= container_of(rcu
, struct batadv_tt_common_entry
, rcu
);
126 tt_global_entry
= container_of(tt_common_entry
,
127 struct batadv_tt_global_entry
, common
);
129 kfree(tt_global_entry
);
133 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry
*tt_global_entry
)
135 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
136 batadv_tt_global_del_orig_list(tt_global_entry
);
137 call_rcu(&tt_global_entry
->common
.rcu
,
138 batadv_tt_global_entry_free_rcu
);
142 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
144 struct batadv_tt_orig_list_entry
*orig_entry
;
146 orig_entry
= container_of(rcu
, struct batadv_tt_orig_list_entry
, rcu
);
147 batadv_orig_node_free_ref(orig_entry
->orig_node
);
152 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry
*orig_entry
)
154 if (!atomic_dec_and_test(&orig_entry
->refcount
))
156 /* to avoid race conditions, immediately decrease the tt counter */
157 atomic_dec(&orig_entry
->orig_node
->tt_size
);
158 call_rcu(&orig_entry
->rcu
, batadv_tt_orig_list_entry_free_rcu
);
161 static void batadv_tt_local_event(struct batadv_priv
*bat_priv
,
162 const uint8_t *addr
, uint8_t flags
)
164 struct batadv_tt_change_node
*tt_change_node
, *entry
, *safe
;
165 bool event_removed
= false;
166 bool del_op_requested
, del_op_entry
;
168 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
173 tt_change_node
->change
.flags
= flags
;
174 memcpy(tt_change_node
->change
.addr
, addr
, ETH_ALEN
);
176 del_op_requested
= flags
& BATADV_TT_CLIENT_DEL
;
178 /* check for ADD+DEL or DEL+ADD events */
179 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
180 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
182 if (!batadv_compare_eth(entry
->change
.addr
, addr
))
185 /* DEL+ADD in the same orig interval have no effect and can be
186 * removed to avoid silly behaviour on the receiver side. The
187 * other way around (ADD+DEL) can happen in case of roaming of
188 * a client still in the NEW state. Roaming of NEW clients is
189 * now possible due to automatically recognition of "temporary"
192 del_op_entry
= entry
->change
.flags
& BATADV_TT_CLIENT_DEL
;
193 if (!del_op_requested
&& del_op_entry
)
195 if (del_op_requested
&& !del_op_entry
)
199 list_del(&entry
->list
);
201 kfree(tt_change_node
);
202 event_removed
= true;
206 /* track the change in the OGMinterval list */
207 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
210 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
213 atomic_dec(&bat_priv
->tt
.local_changes
);
215 atomic_inc(&bat_priv
->tt
.local_changes
);
218 int batadv_tt_len(int changes_num
)
220 return changes_num
* sizeof(struct batadv_tt_change
);
223 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
225 if (bat_priv
->tt
.local_hash
)
228 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
230 if (!bat_priv
->tt
.local_hash
)
233 batadv_hash_set_lock_class(bat_priv
->tt
.local_hash
,
234 &batadv_tt_local_hash_lock_class_key
);
239 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
240 struct batadv_tt_global_entry
*tt_global
,
243 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
244 "Deleting global tt entry %pM: %s\n",
245 tt_global
->common
.addr
, message
);
247 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
248 batadv_choose_orig
, tt_global
->common
.addr
);
249 batadv_tt_global_entry_free_ref(tt_global
);
252 void batadv_tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
255 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
256 struct batadv_tt_local_entry
*tt_local
;
257 struct batadv_tt_global_entry
*tt_global
;
258 struct hlist_head
*head
;
259 struct batadv_tt_orig_list_entry
*orig_entry
;
261 bool roamed_back
= false;
263 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
);
264 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
);
267 tt_local
->last_seen
= jiffies
;
268 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
269 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
270 "Re-adding pending client %pM\n", addr
);
271 /* whatever the reason why the PENDING flag was set,
272 * this is a client which was enqueued to be removed in
273 * this orig_interval. Since it popped up again, the
274 * flag can be reset like it was never enqueued
276 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
280 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
281 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
282 "Roaming client %pM came back to its original location\n",
284 /* the ROAM flag is set because this client roamed away
285 * and the node got a roaming_advertisement message. Now
286 * that the client popped up again at its original
287 * location such flag can be unset
289 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
295 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
299 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
300 "Creating new local tt entry: %pM (ttvn: %d)\n", addr
,
301 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
303 memcpy(tt_local
->common
.addr
, addr
, ETH_ALEN
);
304 /* The local entry has to be marked as NEW to avoid to send it in
305 * a full table response going out before the next ttvn increment
306 * (consistency check)
308 tt_local
->common
.flags
= BATADV_TT_CLIENT_NEW
;
309 if (batadv_is_wifi_iface(ifindex
))
310 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
311 atomic_set(&tt_local
->common
.refcount
, 2);
312 tt_local
->last_seen
= jiffies
;
313 tt_local
->common
.added_at
= tt_local
->last_seen
;
315 /* the batman interface mac address should never be purged */
316 if (batadv_compare_eth(addr
, soft_iface
->dev_addr
))
317 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NOPURGE
;
319 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
320 batadv_choose_orig
, &tt_local
->common
,
321 &tt_local
->common
.hash_entry
);
323 if (unlikely(hash_added
!= 0)) {
324 /* remove the reference for the hash */
325 batadv_tt_local_entry_free_ref(tt_local
);
330 batadv_tt_local_event(bat_priv
, addr
, tt_local
->common
.flags
);
333 /* Check whether it is a roaming, but don't do anything if the roaming
334 * process has already been handled
336 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
337 /* These node are probably going to update their tt table */
338 head
= &tt_global
->orig_list
;
340 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
341 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
342 orig_entry
->orig_node
);
346 batadv_tt_global_free(bat_priv
, tt_global
,
350 /* The global entry has to be marked as ROAMING and
351 * has to be kept for consistency purpose
353 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
354 tt_global
->roam_at
= jiffies
;
360 batadv_tt_local_entry_free_ref(tt_local
);
362 batadv_tt_global_entry_free_ref(tt_global
);
365 static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff
,
366 int *packet_buff_len
,
370 unsigned char *new_buff
;
372 new_buff
= kmalloc(new_packet_len
, GFP_ATOMIC
);
374 /* keep old buffer if kmalloc should fail */
376 memcpy(new_buff
, *packet_buff
, min_packet_len
);
378 *packet_buff
= new_buff
;
379 *packet_buff_len
= new_packet_len
;
383 static void batadv_tt_prepare_packet_buff(struct batadv_priv
*bat_priv
,
384 unsigned char **packet_buff
,
385 int *packet_buff_len
,
388 struct batadv_hard_iface
*primary_if
;
391 primary_if
= batadv_primary_if_get_selected(bat_priv
);
393 req_len
= min_packet_len
;
394 req_len
+= batadv_tt_len(atomic_read(&bat_priv
->tt
.local_changes
));
396 /* if we have too many changes for one packet don't send any
397 * and wait for the tt table request which will be fragmented
399 if ((!primary_if
) || (req_len
> primary_if
->soft_iface
->mtu
))
400 req_len
= min_packet_len
;
402 batadv_tt_realloc_packet_buff(packet_buff
, packet_buff_len
,
403 min_packet_len
, req_len
);
406 batadv_hardif_free_ref(primary_if
);
409 static int batadv_tt_changes_fill_buff(struct batadv_priv
*bat_priv
,
410 unsigned char **packet_buff
,
411 int *packet_buff_len
,
414 struct batadv_tt_change_node
*entry
, *safe
;
415 int count
= 0, tot_changes
= 0, new_len
;
416 unsigned char *tt_buff
;
418 batadv_tt_prepare_packet_buff(bat_priv
, packet_buff
,
419 packet_buff_len
, min_packet_len
);
421 new_len
= *packet_buff_len
- min_packet_len
;
422 tt_buff
= *packet_buff
+ min_packet_len
;
425 tot_changes
= new_len
/ batadv_tt_len(1);
427 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
428 atomic_set(&bat_priv
->tt
.local_changes
, 0);
430 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
432 if (count
< tot_changes
) {
433 memcpy(tt_buff
+ batadv_tt_len(count
),
434 &entry
->change
, sizeof(struct batadv_tt_change
));
437 list_del(&entry
->list
);
440 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
442 /* Keep the buffer for possible tt_request */
443 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
444 kfree(bat_priv
->tt
.last_changeset
);
445 bat_priv
->tt
.last_changeset_len
= 0;
446 bat_priv
->tt
.last_changeset
= NULL
;
447 /* check whether this new OGM has no changes due to size problems */
449 /* if kmalloc() fails we will reply with the full table
450 * instead of providing the diff
452 bat_priv
->tt
.last_changeset
= kmalloc(new_len
, GFP_ATOMIC
);
453 if (bat_priv
->tt
.last_changeset
) {
454 memcpy(bat_priv
->tt
.last_changeset
, tt_buff
, new_len
);
455 bat_priv
->tt
.last_changeset_len
= new_len
;
458 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
463 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
465 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
466 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
467 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
468 struct batadv_tt_common_entry
*tt_common_entry
;
469 struct batadv_tt_local_entry
*tt_local
;
470 struct batadv_hard_iface
*primary_if
;
471 struct hlist_head
*head
;
475 unsigned long last_seen_jiffies
;
477 uint16_t np_flag
= BATADV_TT_CLIENT_NOPURGE
;
479 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
484 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.4x):\n",
485 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->tt
.vn
),
486 bat_priv
->tt
.local_crc
);
487 seq_printf(seq
, " %-13s %-7s %-10s\n", "Client", "Flags",
490 for (i
= 0; i
< hash
->size
; i
++) {
491 head
= &hash
->table
[i
];
494 hlist_for_each_entry_rcu(tt_common_entry
,
496 tt_local
= container_of(tt_common_entry
,
497 struct batadv_tt_local_entry
,
499 last_seen_jiffies
= jiffies
- tt_local
->last_seen
;
500 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
501 last_seen_secs
= last_seen_msecs
/ 1000;
502 last_seen_msecs
= last_seen_msecs
% 1000;
504 no_purge
= tt_common_entry
->flags
& np_flag
;
506 seq_printf(seq
, " * %pM [%c%c%c%c%c] %3u.%03u\n",
507 tt_common_entry
->addr
,
508 (tt_common_entry
->flags
&
509 BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
510 no_purge
? 'P' : '.',
511 (tt_common_entry
->flags
&
512 BATADV_TT_CLIENT_NEW
? 'N' : '.'),
513 (tt_common_entry
->flags
&
514 BATADV_TT_CLIENT_PENDING
? 'X' : '.'),
515 (tt_common_entry
->flags
&
516 BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
517 no_purge
? 0 : last_seen_secs
,
518 no_purge
? 0 : last_seen_msecs
);
524 batadv_hardif_free_ref(primary_if
);
529 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
530 struct batadv_tt_local_entry
*tt_local_entry
,
531 uint16_t flags
, const char *message
)
533 batadv_tt_local_event(bat_priv
, tt_local_entry
->common
.addr
,
534 tt_local_entry
->common
.flags
| flags
);
536 /* The local client has to be marked as "pending to be removed" but has
537 * to be kept in the table in order to send it in a full table
538 * response issued before the net ttvn increment (consistency check)
540 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
542 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
543 "Local tt entry (%pM) pending to be removed: %s\n",
544 tt_local_entry
->common
.addr
, message
);
548 * batadv_tt_local_remove - logically remove an entry from the local table
549 * @bat_priv: the bat priv with all the soft interface information
550 * @addr: the MAC address of the client to remove
551 * @message: message to append to the log on deletion
552 * @roaming: true if the deletion is due to a roaming event
554 * Returns the flags assigned to the local entry before being deleted
556 uint16_t batadv_tt_local_remove(struct batadv_priv
*bat_priv
,
557 const uint8_t *addr
, const char *message
,
560 struct batadv_tt_local_entry
*tt_local_entry
;
561 uint16_t flags
, curr_flags
= BATADV_NO_FLAGS
;
563 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
);
567 curr_flags
= tt_local_entry
->common
.flags
;
569 flags
= BATADV_TT_CLIENT_DEL
;
570 /* if this global entry addition is due to a roaming, the node has to
571 * mark the local entry as "roamed" in order to correctly reroute
575 flags
|= BATADV_TT_CLIENT_ROAM
;
576 /* mark the local client as ROAMed */
577 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
580 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
581 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
585 /* if this client has been added right now, it is possible to
586 * immediately purge it
588 batadv_tt_local_event(bat_priv
, tt_local_entry
->common
.addr
,
589 curr_flags
| BATADV_TT_CLIENT_DEL
);
590 hlist_del_rcu(&tt_local_entry
->common
.hash_entry
);
591 batadv_tt_local_entry_free_ref(tt_local_entry
);
595 batadv_tt_local_entry_free_ref(tt_local_entry
);
600 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
601 struct hlist_head
*head
)
603 struct batadv_tt_local_entry
*tt_local_entry
;
604 struct batadv_tt_common_entry
*tt_common_entry
;
605 struct hlist_node
*node_tmp
;
607 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
, head
,
609 tt_local_entry
= container_of(tt_common_entry
,
610 struct batadv_tt_local_entry
,
612 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
615 /* entry already marked for deletion */
616 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
619 if (!batadv_has_timed_out(tt_local_entry
->last_seen
,
620 BATADV_TT_LOCAL_TIMEOUT
))
623 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
624 BATADV_TT_CLIENT_DEL
, "timed out");
628 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
)
630 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
631 struct hlist_head
*head
;
632 spinlock_t
*list_lock
; /* protects write access to the hash lists */
635 for (i
= 0; i
< hash
->size
; i
++) {
636 head
= &hash
->table
[i
];
637 list_lock
= &hash
->list_locks
[i
];
639 spin_lock_bh(list_lock
);
640 batadv_tt_local_purge_list(bat_priv
, head
);
641 spin_unlock_bh(list_lock
);
645 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
647 struct batadv_hashtable
*hash
;
648 spinlock_t
*list_lock
; /* protects write access to the hash lists */
649 struct batadv_tt_common_entry
*tt_common_entry
;
650 struct batadv_tt_local_entry
*tt_local
;
651 struct hlist_node
*node_tmp
;
652 struct hlist_head
*head
;
655 if (!bat_priv
->tt
.local_hash
)
658 hash
= bat_priv
->tt
.local_hash
;
660 for (i
= 0; i
< hash
->size
; i
++) {
661 head
= &hash
->table
[i
];
662 list_lock
= &hash
->list_locks
[i
];
664 spin_lock_bh(list_lock
);
665 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
667 hlist_del_rcu(&tt_common_entry
->hash_entry
);
668 tt_local
= container_of(tt_common_entry
,
669 struct batadv_tt_local_entry
,
671 batadv_tt_local_entry_free_ref(tt_local
);
673 spin_unlock_bh(list_lock
);
676 batadv_hash_destroy(hash
);
678 bat_priv
->tt
.local_hash
= NULL
;
681 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
683 if (bat_priv
->tt
.global_hash
)
686 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
688 if (!bat_priv
->tt
.global_hash
)
691 batadv_hash_set_lock_class(bat_priv
->tt
.global_hash
,
692 &batadv_tt_global_hash_lock_class_key
);
697 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
699 struct batadv_tt_change_node
*entry
, *safe
;
701 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
703 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
705 list_del(&entry
->list
);
709 atomic_set(&bat_priv
->tt
.local_changes
, 0);
710 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
713 /* retrieves the orig_tt_list_entry belonging to orig_node from the
714 * batadv_tt_global_entry list
716 * returns it with an increased refcounter, NULL if not found
718 static struct batadv_tt_orig_list_entry
*
719 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
720 const struct batadv_orig_node
*orig_node
)
722 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
723 const struct hlist_head
*head
;
726 head
= &entry
->orig_list
;
727 hlist_for_each_entry_rcu(tmp_orig_entry
, head
, list
) {
728 if (tmp_orig_entry
->orig_node
!= orig_node
)
730 if (!atomic_inc_not_zero(&tmp_orig_entry
->refcount
))
733 orig_entry
= tmp_orig_entry
;
741 /* find out if an orig_node is already in the list of a tt_global_entry.
742 * returns true if found, false otherwise
745 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
746 const struct batadv_orig_node
*orig_node
)
748 struct batadv_tt_orig_list_entry
*orig_entry
;
751 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
754 batadv_tt_orig_list_entry_free_ref(orig_entry
);
761 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
762 struct batadv_orig_node
*orig_node
, int ttvn
)
764 struct batadv_tt_orig_list_entry
*orig_entry
;
766 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
768 /* refresh the ttvn: the current value could be a bogus one that
769 * was added during a "temporary client detection"
771 orig_entry
->ttvn
= ttvn
;
775 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
779 INIT_HLIST_NODE(&orig_entry
->list
);
780 atomic_inc(&orig_node
->refcount
);
781 atomic_inc(&orig_node
->tt_size
);
782 orig_entry
->orig_node
= orig_node
;
783 orig_entry
->ttvn
= ttvn
;
784 atomic_set(&orig_entry
->refcount
, 2);
786 spin_lock_bh(&tt_global
->list_lock
);
787 hlist_add_head_rcu(&orig_entry
->list
,
788 &tt_global
->orig_list
);
789 spin_unlock_bh(&tt_global
->list_lock
);
792 batadv_tt_orig_list_entry_free_ref(orig_entry
);
795 /* caller must hold orig_node refcount */
796 int batadv_tt_global_add(struct batadv_priv
*bat_priv
,
797 struct batadv_orig_node
*orig_node
,
798 const unsigned char *tt_addr
, uint8_t flags
,
801 struct batadv_tt_global_entry
*tt_global_entry
;
802 struct batadv_tt_local_entry
*tt_local_entry
;
805 struct batadv_tt_common_entry
*common
;
806 uint16_t local_flags
;
808 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
);
809 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
);
811 /* if the node already has a local client for this entry, it has to wait
812 * for a roaming advertisement instead of manually messing up the global
815 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
816 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
819 if (!tt_global_entry
) {
820 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
821 if (!tt_global_entry
)
824 common
= &tt_global_entry
->common
;
825 memcpy(common
->addr
, tt_addr
, ETH_ALEN
);
827 common
->flags
= flags
;
828 tt_global_entry
->roam_at
= 0;
829 /* node must store current time in case of roaming. This is
830 * needed to purge this entry out on timeout (if nobody claims
833 if (flags
& BATADV_TT_CLIENT_ROAM
)
834 tt_global_entry
->roam_at
= jiffies
;
835 atomic_set(&common
->refcount
, 2);
836 common
->added_at
= jiffies
;
838 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
839 spin_lock_init(&tt_global_entry
->list_lock
);
841 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
843 batadv_choose_orig
, common
,
844 &common
->hash_entry
);
846 if (unlikely(hash_added
!= 0)) {
847 /* remove the reference for the hash */
848 batadv_tt_global_entry_free_ref(tt_global_entry
);
852 common
= &tt_global_entry
->common
;
853 /* If there is already a global entry, we can use this one for
855 * But if we are trying to add a temporary client then here are
856 * two options at this point:
857 * 1) the global client is not a temporary client: the global
858 * client has to be left as it is, temporary information
859 * should never override any already known client state
860 * 2) the global client is a temporary client: purge the
861 * originator list and add the new one orig_entry
863 if (flags
& BATADV_TT_CLIENT_TEMP
) {
864 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
866 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
869 batadv_tt_global_del_orig_list(tt_global_entry
);
873 /* if the client was temporary added before receiving the first
874 * OGM announcing it, we have to clear the TEMP flag
876 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
878 /* the change can carry possible "attribute" flags like the
879 * TT_CLIENT_WIFI, therefore they have to be copied in the
882 tt_global_entry
->common
.flags
|= flags
;
884 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
885 * one originator left in the list and we previously received a
886 * delete + roaming change for this originator.
888 * We should first delete the old originator before adding the
891 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
892 batadv_tt_global_del_orig_list(tt_global_entry
);
893 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
894 tt_global_entry
->roam_at
= 0;
898 /* add the new orig_entry (if needed) or update it */
899 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
901 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
902 "Creating new global tt entry: %pM (via %pM)\n",
903 common
->addr
, orig_node
->orig
);
908 /* remove address from local hash if present */
909 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
,
910 "global tt received",
911 !!(flags
& BATADV_TT_CLIENT_ROAM
));
912 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
914 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
915 /* this is a normal global add. Therefore the client is not in a
916 * roaming state anymore.
918 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
922 batadv_tt_global_entry_free_ref(tt_global_entry
);
924 batadv_tt_local_entry_free_ref(tt_local_entry
);
928 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
929 * @tt_global_entry: global translation table entry to be analyzed
931 * This functon assumes the caller holds rcu_read_lock().
932 * Returns best originator list entry or NULL on errors.
934 static struct batadv_tt_orig_list_entry
*
935 batadv_transtable_best_orig(struct batadv_tt_global_entry
*tt_global_entry
)
937 struct batadv_neigh_node
*router
= NULL
;
938 struct hlist_head
*head
;
939 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
942 head
= &tt_global_entry
->orig_list
;
943 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
944 router
= batadv_orig_node_get_router(orig_entry
->orig_node
);
948 if (router
->tq_avg
> best_tq
) {
949 best_entry
= orig_entry
;
950 best_tq
= router
->tq_avg
;
953 batadv_neigh_node_free_ref(router
);
959 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
960 * for this global entry
961 * @tt_global_entry: global translation table entry to be printed
962 * @seq: debugfs table seq_file struct
964 * This functon assumes the caller holds rcu_read_lock().
967 batadv_tt_global_print_entry(struct batadv_tt_global_entry
*tt_global_entry
,
968 struct seq_file
*seq
)
970 struct hlist_head
*head
;
971 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
972 struct batadv_tt_common_entry
*tt_common_entry
;
976 tt_common_entry
= &tt_global_entry
->common
;
977 flags
= tt_common_entry
->flags
;
979 best_entry
= batadv_transtable_best_orig(tt_global_entry
);
981 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
983 " %c %pM (%3u) via %pM (%3u) (%#.4x) [%c%c%c]\n",
984 '*', tt_global_entry
->common
.addr
,
985 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
986 last_ttvn
, best_entry
->orig_node
->tt_crc
,
987 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
988 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
989 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
992 head
= &tt_global_entry
->orig_list
;
994 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
995 if (best_entry
== orig_entry
)
998 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
999 seq_printf(seq
, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n",
1000 '+', tt_global_entry
->common
.addr
,
1001 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1003 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1004 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1005 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1009 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1011 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1012 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1013 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1014 struct batadv_tt_common_entry
*tt_common_entry
;
1015 struct batadv_tt_global_entry
*tt_global
;
1016 struct batadv_hard_iface
*primary_if
;
1017 struct hlist_head
*head
;
1020 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1025 "Globally announced TT entries received via the mesh %s\n",
1027 seq_printf(seq
, " %-13s %s %-15s %s (%-6s) %s\n",
1028 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "CRC",
1031 for (i
= 0; i
< hash
->size
; i
++) {
1032 head
= &hash
->table
[i
];
1035 hlist_for_each_entry_rcu(tt_common_entry
,
1037 tt_global
= container_of(tt_common_entry
,
1038 struct batadv_tt_global_entry
,
1040 batadv_tt_global_print_entry(tt_global
, seq
);
1046 batadv_hardif_free_ref(primary_if
);
1050 /* deletes the orig list of a tt_global_entry */
1052 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1054 struct hlist_head
*head
;
1055 struct hlist_node
*safe
;
1056 struct batadv_tt_orig_list_entry
*orig_entry
;
1058 spin_lock_bh(&tt_global_entry
->list_lock
);
1059 head
= &tt_global_entry
->orig_list
;
1060 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1061 hlist_del_rcu(&orig_entry
->list
);
1062 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1064 spin_unlock_bh(&tt_global_entry
->list_lock
);
1068 batadv_tt_global_del_orig_entry(struct batadv_priv
*bat_priv
,
1069 struct batadv_tt_global_entry
*tt_global_entry
,
1070 struct batadv_orig_node
*orig_node
,
1071 const char *message
)
1073 struct hlist_head
*head
;
1074 struct hlist_node
*safe
;
1075 struct batadv_tt_orig_list_entry
*orig_entry
;
1077 spin_lock_bh(&tt_global_entry
->list_lock
);
1078 head
= &tt_global_entry
->orig_list
;
1079 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1080 if (orig_entry
->orig_node
== orig_node
) {
1081 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1082 "Deleting %pM from global tt entry %pM: %s\n",
1084 tt_global_entry
->common
.addr
, message
);
1085 hlist_del_rcu(&orig_entry
->list
);
1086 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1089 spin_unlock_bh(&tt_global_entry
->list_lock
);
1092 /* If the client is to be deleted, we check if it is the last origantor entry
1093 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1094 * timer, otherwise we simply remove the originator scheduled for deletion.
1097 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1098 struct batadv_tt_global_entry
*tt_global_entry
,
1099 struct batadv_orig_node
*orig_node
,
1100 const char *message
)
1102 bool last_entry
= true;
1103 struct hlist_head
*head
;
1104 struct batadv_tt_orig_list_entry
*orig_entry
;
1106 /* no local entry exists, case 1:
1107 * Check if this is the last one or if other entries exist.
1111 head
= &tt_global_entry
->orig_list
;
1112 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1113 if (orig_entry
->orig_node
!= orig_node
) {
1121 /* its the last one, mark for roaming. */
1122 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1123 tt_global_entry
->roam_at
= jiffies
;
1125 /* there is another entry, we can simply delete this
1126 * one and can still use the other one.
1128 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1129 orig_node
, message
);
1134 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1135 struct batadv_orig_node
*orig_node
,
1136 const unsigned char *addr
,
1137 const char *message
, bool roaming
)
1139 struct batadv_tt_global_entry
*tt_global_entry
;
1140 struct batadv_tt_local_entry
*local_entry
= NULL
;
1142 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
);
1143 if (!tt_global_entry
)
1147 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1148 orig_node
, message
);
1150 if (hlist_empty(&tt_global_entry
->orig_list
))
1151 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1157 /* if we are deleting a global entry due to a roam
1158 * event, there are two possibilities:
1159 * 1) the client roamed from node A to node B => if there
1160 * is only one originator left for this client, we mark
1161 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1162 * wait for node B to claim it. In case of timeout
1163 * the entry is purged.
1165 * If there are other originators left, we directly delete
1167 * 2) the client roamed to us => we can directly delete
1168 * the global entry, since it is useless now.
1170 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1171 tt_global_entry
->common
.addr
);
1173 /* local entry exists, case 2: client roamed to us. */
1174 batadv_tt_global_del_orig_list(tt_global_entry
);
1175 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1177 /* no local entry exists, case 1: check for roaming */
1178 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1179 orig_node
, message
);
1183 if (tt_global_entry
)
1184 batadv_tt_global_entry_free_ref(tt_global_entry
);
1186 batadv_tt_local_entry_free_ref(local_entry
);
1189 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1190 struct batadv_orig_node
*orig_node
,
1191 const char *message
)
1193 struct batadv_tt_global_entry
*tt_global
;
1194 struct batadv_tt_common_entry
*tt_common_entry
;
1196 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1197 struct hlist_node
*safe
;
1198 struct hlist_head
*head
;
1199 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1204 for (i
= 0; i
< hash
->size
; i
++) {
1205 head
= &hash
->table
[i
];
1206 list_lock
= &hash
->list_locks
[i
];
1208 spin_lock_bh(list_lock
);
1209 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1211 tt_global
= container_of(tt_common_entry
,
1212 struct batadv_tt_global_entry
,
1215 batadv_tt_global_del_orig_entry(bat_priv
, tt_global
,
1216 orig_node
, message
);
1218 if (hlist_empty(&tt_global
->orig_list
)) {
1219 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1220 "Deleting global tt entry %pM: %s\n",
1221 tt_global
->common
.addr
, message
);
1222 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1223 batadv_tt_global_entry_free_ref(tt_global
);
1226 spin_unlock_bh(list_lock
);
1228 orig_node
->tt_initialised
= false;
1231 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1235 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1236 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1238 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1239 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1241 *msg
= "Roaming timeout\n";
1244 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1245 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1247 *msg
= "Temporary client timeout\n";
1253 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1255 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1256 struct hlist_head
*head
;
1257 struct hlist_node
*node_tmp
;
1258 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1261 struct batadv_tt_common_entry
*tt_common
;
1262 struct batadv_tt_global_entry
*tt_global
;
1264 for (i
= 0; i
< hash
->size
; i
++) {
1265 head
= &hash
->table
[i
];
1266 list_lock
= &hash
->list_locks
[i
];
1268 spin_lock_bh(list_lock
);
1269 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
1271 tt_global
= container_of(tt_common
,
1272 struct batadv_tt_global_entry
,
1275 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1278 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1279 "Deleting global tt entry (%pM): %s\n",
1280 tt_global
->common
.addr
, msg
);
1282 hlist_del_rcu(&tt_common
->hash_entry
);
1284 batadv_tt_global_entry_free_ref(tt_global
);
1286 spin_unlock_bh(list_lock
);
1290 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1292 struct batadv_hashtable
*hash
;
1293 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1294 struct batadv_tt_common_entry
*tt_common_entry
;
1295 struct batadv_tt_global_entry
*tt_global
;
1296 struct hlist_node
*node_tmp
;
1297 struct hlist_head
*head
;
1300 if (!bat_priv
->tt
.global_hash
)
1303 hash
= bat_priv
->tt
.global_hash
;
1305 for (i
= 0; i
< hash
->size
; i
++) {
1306 head
= &hash
->table
[i
];
1307 list_lock
= &hash
->list_locks
[i
];
1309 spin_lock_bh(list_lock
);
1310 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1312 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1313 tt_global
= container_of(tt_common_entry
,
1314 struct batadv_tt_global_entry
,
1316 batadv_tt_global_entry_free_ref(tt_global
);
1318 spin_unlock_bh(list_lock
);
1321 batadv_hash_destroy(hash
);
1323 bat_priv
->tt
.global_hash
= NULL
;
1327 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
1328 struct batadv_tt_global_entry
*tt_global_entry
)
1332 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
1333 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
1339 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
1341 const uint8_t *addr
)
1343 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
1344 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
1345 struct batadv_orig_node
*orig_node
= NULL
;
1346 struct batadv_tt_orig_list_entry
*best_entry
;
1348 if (src
&& atomic_read(&bat_priv
->ap_isolation
)) {
1349 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
);
1350 if (!tt_local_entry
||
1351 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
1355 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
);
1356 if (!tt_global_entry
)
1359 /* check whether the clients should not communicate due to AP
1362 if (tt_local_entry
&&
1363 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
1367 best_entry
= batadv_transtable_best_orig(tt_global_entry
);
1368 /* found anything? */
1370 orig_node
= best_entry
->orig_node
;
1371 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1376 if (tt_global_entry
)
1377 batadv_tt_global_entry_free_ref(tt_global_entry
);
1379 batadv_tt_local_entry_free_ref(tt_local_entry
);
1384 /* Calculates the checksum of the local table of a given orig_node */
1385 static uint16_t batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
1386 struct batadv_orig_node
*orig_node
)
1388 uint16_t total
= 0, total_one
;
1389 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1390 struct batadv_tt_common_entry
*tt_common
;
1391 struct batadv_tt_global_entry
*tt_global
;
1392 struct hlist_head
*head
;
1396 for (i
= 0; i
< hash
->size
; i
++) {
1397 head
= &hash
->table
[i
];
1400 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1401 tt_global
= container_of(tt_common
,
1402 struct batadv_tt_global_entry
,
1404 /* Roaming clients are in the global table for
1405 * consistency only. They don't have to be
1406 * taken into account while computing the
1409 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
1411 /* Temporary clients have not been announced yet, so
1412 * they have to be skipped while computing the global
1415 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
1418 /* find out if this global entry is announced by this
1421 if (!batadv_tt_global_entry_has_orig(tt_global
,
1426 for (j
= 0; j
< ETH_ALEN
; j
++)
1427 total_one
= crc16_byte(total_one
,
1428 tt_common
->addr
[j
]);
1437 /* Calculates the checksum of the local table */
1438 static uint16_t batadv_tt_local_crc(struct batadv_priv
*bat_priv
)
1440 uint16_t total
= 0, total_one
;
1441 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1442 struct batadv_tt_common_entry
*tt_common
;
1443 struct hlist_head
*head
;
1447 for (i
= 0; i
< hash
->size
; i
++) {
1448 head
= &hash
->table
[i
];
1451 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1452 /* not yet committed clients have not to be taken into
1453 * account while computing the CRC
1455 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
1458 for (j
= 0; j
< ETH_ALEN
; j
++)
1459 total_one
= crc16_byte(total_one
,
1460 tt_common
->addr
[j
]);
1469 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
1471 struct batadv_tt_req_node
*node
, *safe
;
1473 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1475 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
1476 list_del(&node
->list
);
1480 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1483 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
1484 struct batadv_orig_node
*orig_node
,
1485 const unsigned char *tt_buff
,
1486 uint8_t tt_num_changes
)
1488 uint16_t tt_buff_len
= batadv_tt_len(tt_num_changes
);
1490 /* Replace the old buffer only if I received something in the
1491 * last OGM (the OGM could carry no changes)
1493 spin_lock_bh(&orig_node
->tt_buff_lock
);
1494 if (tt_buff_len
> 0) {
1495 kfree(orig_node
->tt_buff
);
1496 orig_node
->tt_buff_len
= 0;
1497 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
1498 if (orig_node
->tt_buff
) {
1499 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
1500 orig_node
->tt_buff_len
= tt_buff_len
;
1503 spin_unlock_bh(&orig_node
->tt_buff_lock
);
1506 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
1508 struct batadv_tt_req_node
*node
, *safe
;
1510 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1511 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
1512 if (batadv_has_timed_out(node
->issued_at
,
1513 BATADV_TT_REQUEST_TIMEOUT
)) {
1514 list_del(&node
->list
);
1518 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1521 /* returns the pointer to the new tt_req_node struct if no request
1522 * has already been issued for this orig_node, NULL otherwise
1524 static struct batadv_tt_req_node
*
1525 batadv_new_tt_req_node(struct batadv_priv
*bat_priv
,
1526 struct batadv_orig_node
*orig_node
)
1528 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
1530 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1531 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
1532 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
1533 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
1534 BATADV_TT_REQUEST_TIMEOUT
))
1538 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
1542 memcpy(tt_req_node
->addr
, orig_node
->orig
, ETH_ALEN
);
1543 tt_req_node
->issued_at
= jiffies
;
1545 list_add(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
1547 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1551 /* data_ptr is useless here, but has to be kept to respect the prototype */
1552 static int batadv_tt_local_valid_entry(const void *entry_ptr
,
1553 const void *data_ptr
)
1555 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
1557 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
1562 static int batadv_tt_global_valid(const void *entry_ptr
,
1563 const void *data_ptr
)
1565 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
1566 const struct batadv_tt_global_entry
*tt_global_entry
;
1567 const struct batadv_orig_node
*orig_node
= data_ptr
;
1569 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
1570 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
1573 tt_global_entry
= container_of(tt_common_entry
,
1574 struct batadv_tt_global_entry
,
1577 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
1580 static struct sk_buff
*
1581 batadv_tt_response_fill_table(uint16_t tt_len
, uint8_t ttvn
,
1582 struct batadv_hashtable
*hash
,
1583 struct batadv_hard_iface
*primary_if
,
1584 int (*valid_cb
)(const void *, const void *),
1587 struct batadv_tt_common_entry
*tt_common_entry
;
1588 struct batadv_tt_query_packet
*tt_response
;
1589 struct batadv_tt_change
*tt_change
;
1590 struct hlist_head
*head
;
1591 struct sk_buff
*skb
= NULL
;
1592 uint16_t tt_tot
, tt_count
;
1593 ssize_t tt_query_size
= sizeof(struct batadv_tt_query_packet
);
1597 if (tt_query_size
+ tt_len
> primary_if
->soft_iface
->mtu
) {
1598 tt_len
= primary_if
->soft_iface
->mtu
- tt_query_size
;
1599 tt_len
-= tt_len
% sizeof(struct batadv_tt_change
);
1601 tt_tot
= tt_len
/ sizeof(struct batadv_tt_change
);
1603 len
= tt_query_size
+ tt_len
;
1604 skb
= dev_alloc_skb(len
+ ETH_HLEN
+ NET_IP_ALIGN
);
1608 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
1609 tt_response
= (struct batadv_tt_query_packet
*)skb_put(skb
, len
);
1610 tt_response
->ttvn
= ttvn
;
1612 tt_change
= (struct batadv_tt_change
*)(skb
->data
+ tt_query_size
);
1616 for (i
= 0; i
< hash
->size
; i
++) {
1617 head
= &hash
->table
[i
];
1619 hlist_for_each_entry_rcu(tt_common_entry
,
1621 if (tt_count
== tt_tot
)
1624 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
1627 memcpy(tt_change
->addr
, tt_common_entry
->addr
,
1629 tt_change
->flags
= tt_common_entry
->flags
;
1637 /* store in the message the number of entries we have successfully
1640 tt_response
->tt_data
= htons(tt_count
);
1646 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
1647 struct batadv_orig_node
*dst_orig_node
,
1648 uint8_t ttvn
, uint16_t tt_crc
,
1651 struct sk_buff
*skb
= NULL
;
1652 struct batadv_tt_query_packet
*tt_request
;
1653 struct batadv_hard_iface
*primary_if
;
1654 struct batadv_tt_req_node
*tt_req_node
= NULL
;
1658 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1662 /* The new tt_req will be issued only if I'm not waiting for a
1663 * reply from the same orig_node yet
1665 tt_req_node
= batadv_new_tt_req_node(bat_priv
, dst_orig_node
);
1669 skb
= dev_alloc_skb(sizeof(*tt_request
) + ETH_HLEN
+ NET_IP_ALIGN
);
1673 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
1675 tt_req_len
= sizeof(*tt_request
);
1676 tt_request
= (struct batadv_tt_query_packet
*)skb_put(skb
, tt_req_len
);
1678 tt_request
->header
.packet_type
= BATADV_TT_QUERY
;
1679 tt_request
->header
.version
= BATADV_COMPAT_VERSION
;
1680 memcpy(tt_request
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1681 memcpy(tt_request
->dst
, dst_orig_node
->orig
, ETH_ALEN
);
1682 tt_request
->header
.ttl
= BATADV_TTL
;
1683 tt_request
->ttvn
= ttvn
;
1684 tt_request
->tt_data
= htons(tt_crc
);
1685 tt_request
->flags
= BATADV_TT_REQUEST
;
1688 tt_request
->flags
|= BATADV_TT_FULL_TABLE
;
1690 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
1691 dst_orig_node
->orig
, (full_table
? 'F' : '.'));
1693 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
1695 if (batadv_send_skb_to_orig(skb
, dst_orig_node
, NULL
))
1700 batadv_hardif_free_ref(primary_if
);
1703 if (ret
&& tt_req_node
) {
1704 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1705 list_del(&tt_req_node
->list
);
1706 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1713 batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
1714 struct batadv_tt_query_packet
*tt_request
)
1716 struct batadv_orig_node
*req_dst_orig_node
;
1717 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
1718 struct batadv_hard_iface
*primary_if
= NULL
;
1719 uint8_t orig_ttvn
, req_ttvn
, ttvn
;
1721 unsigned char *tt_buff
;
1723 uint16_t tt_len
, tt_tot
;
1724 struct sk_buff
*skb
= NULL
;
1725 struct batadv_tt_query_packet
*tt_response
;
1726 uint8_t *packet_pos
;
1729 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1730 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1731 tt_request
->src
, tt_request
->ttvn
, tt_request
->dst
,
1732 (tt_request
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
1734 /* Let's get the orig node of the REAL destination */
1735 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, tt_request
->dst
);
1736 if (!req_dst_orig_node
)
1739 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, tt_request
->src
);
1740 if (!res_dst_orig_node
)
1743 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1747 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
1748 req_ttvn
= tt_request
->ttvn
;
1750 /* I don't have the requested data */
1751 if (orig_ttvn
!= req_ttvn
||
1752 tt_request
->tt_data
!= htons(req_dst_orig_node
->tt_crc
))
1755 /* If the full table has been explicitly requested */
1756 if (tt_request
->flags
& BATADV_TT_FULL_TABLE
||
1757 !req_dst_orig_node
->tt_buff
)
1762 /* In this version, fragmentation is not implemented, then
1763 * I'll send only one packet with as much TT entries as I can
1766 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
1767 tt_len
= req_dst_orig_node
->tt_buff_len
;
1768 tt_tot
= tt_len
/ sizeof(struct batadv_tt_change
);
1770 len
= sizeof(*tt_response
) + tt_len
;
1771 skb
= dev_alloc_skb(len
+ ETH_HLEN
+ NET_IP_ALIGN
);
1775 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
1776 packet_pos
= skb_put(skb
, len
);
1777 tt_response
= (struct batadv_tt_query_packet
*)packet_pos
;
1778 tt_response
->ttvn
= req_ttvn
;
1779 tt_response
->tt_data
= htons(tt_tot
);
1781 tt_buff
= skb
->data
+ sizeof(*tt_response
);
1782 /* Copy the last orig_node's OGM buffer */
1783 memcpy(tt_buff
, req_dst_orig_node
->tt_buff
,
1784 req_dst_orig_node
->tt_buff_len
);
1786 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
1788 tt_len
= (uint16_t)atomic_read(&req_dst_orig_node
->tt_size
);
1789 tt_len
*= sizeof(struct batadv_tt_change
);
1790 ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
1792 skb
= batadv_tt_response_fill_table(tt_len
, ttvn
,
1793 bat_priv
->tt
.global_hash
,
1795 batadv_tt_global_valid
,
1800 tt_response
= (struct batadv_tt_query_packet
*)skb
->data
;
1803 tt_response
->header
.packet_type
= BATADV_TT_QUERY
;
1804 tt_response
->header
.version
= BATADV_COMPAT_VERSION
;
1805 tt_response
->header
.ttl
= BATADV_TTL
;
1806 memcpy(tt_response
->src
, req_dst_orig_node
->orig
, ETH_ALEN
);
1807 memcpy(tt_response
->dst
, tt_request
->src
, ETH_ALEN
);
1808 tt_response
->flags
= BATADV_TT_RESPONSE
;
1811 tt_response
->flags
|= BATADV_TT_FULL_TABLE
;
1813 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1814 "Sending TT_RESPONSE %pM for %pM (ttvn: %u)\n",
1815 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
, req_ttvn
);
1817 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
1819 if (batadv_send_skb_to_orig(skb
, res_dst_orig_node
, NULL
))
1824 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
1827 if (res_dst_orig_node
)
1828 batadv_orig_node_free_ref(res_dst_orig_node
);
1829 if (req_dst_orig_node
)
1830 batadv_orig_node_free_ref(req_dst_orig_node
);
1832 batadv_hardif_free_ref(primary_if
);
1839 batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
1840 struct batadv_tt_query_packet
*tt_request
)
1842 struct batadv_orig_node
*orig_node
;
1843 struct batadv_hard_iface
*primary_if
= NULL
;
1844 uint8_t my_ttvn
, req_ttvn
, ttvn
;
1846 unsigned char *tt_buff
;
1848 uint16_t tt_len
, tt_tot
;
1849 struct sk_buff
*skb
= NULL
;
1850 struct batadv_tt_query_packet
*tt_response
;
1851 uint8_t *packet_pos
;
1854 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1855 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1856 tt_request
->src
, tt_request
->ttvn
,
1857 (tt_request
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
1860 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
1861 req_ttvn
= tt_request
->ttvn
;
1863 orig_node
= batadv_orig_hash_find(bat_priv
, tt_request
->src
);
1867 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1871 /* If the full table has been explicitly requested or the gap
1872 * is too big send the whole local translation table
1874 if (tt_request
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
1875 !bat_priv
->tt
.last_changeset
)
1880 /* In this version, fragmentation is not implemented, then
1881 * I'll send only one packet with as much TT entries as I can
1884 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
1885 tt_len
= bat_priv
->tt
.last_changeset_len
;
1886 tt_tot
= tt_len
/ sizeof(struct batadv_tt_change
);
1888 len
= sizeof(*tt_response
) + tt_len
;
1889 skb
= dev_alloc_skb(len
+ ETH_HLEN
+ NET_IP_ALIGN
);
1893 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
1894 packet_pos
= skb_put(skb
, len
);
1895 tt_response
= (struct batadv_tt_query_packet
*)packet_pos
;
1896 tt_response
->ttvn
= req_ttvn
;
1897 tt_response
->tt_data
= htons(tt_tot
);
1899 tt_buff
= skb
->data
+ sizeof(*tt_response
);
1900 memcpy(tt_buff
, bat_priv
->tt
.last_changeset
,
1901 bat_priv
->tt
.last_changeset_len
);
1902 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
1904 tt_len
= (uint16_t)atomic_read(&bat_priv
->tt
.local_entry_num
);
1905 tt_len
*= sizeof(struct batadv_tt_change
);
1906 ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
1908 skb
= batadv_tt_response_fill_table(tt_len
, ttvn
,
1909 bat_priv
->tt
.local_hash
,
1911 batadv_tt_local_valid_entry
,
1916 tt_response
= (struct batadv_tt_query_packet
*)skb
->data
;
1919 tt_response
->header
.packet_type
= BATADV_TT_QUERY
;
1920 tt_response
->header
.version
= BATADV_COMPAT_VERSION
;
1921 tt_response
->header
.ttl
= BATADV_TTL
;
1922 memcpy(tt_response
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1923 memcpy(tt_response
->dst
, tt_request
->src
, ETH_ALEN
);
1924 tt_response
->flags
= BATADV_TT_RESPONSE
;
1927 tt_response
->flags
|= BATADV_TT_FULL_TABLE
;
1929 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1930 "Sending TT_RESPONSE to %pM [%c]\n",
1932 (tt_response
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
1934 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
1936 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
))
1941 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
1944 batadv_orig_node_free_ref(orig_node
);
1946 batadv_hardif_free_ref(primary_if
);
1949 /* This packet was for me, so it doesn't need to be re-routed */
1953 bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
1954 struct batadv_tt_query_packet
*tt_request
)
1956 if (batadv_is_my_mac(tt_request
->dst
)) {
1957 /* don't answer backbone gws! */
1958 if (batadv_bla_is_backbone_gw_orig(bat_priv
, tt_request
->src
))
1961 return batadv_send_my_tt_response(bat_priv
, tt_request
);
1963 return batadv_send_other_tt_response(bat_priv
, tt_request
);
1967 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
1968 struct batadv_orig_node
*orig_node
,
1969 struct batadv_tt_change
*tt_change
,
1970 uint16_t tt_num_changes
, uint8_t ttvn
)
1975 for (i
= 0; i
< tt_num_changes
; i
++) {
1976 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
1977 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
1978 batadv_tt_global_del(bat_priv
, orig_node
,
1979 (tt_change
+ i
)->addr
,
1980 "tt removed by changes",
1983 if (!batadv_tt_global_add(bat_priv
, orig_node
,
1984 (tt_change
+ i
)->addr
,
1985 (tt_change
+ i
)->flags
, ttvn
))
1986 /* In case of problem while storing a
1987 * global_entry, we stop the updating
1988 * procedure without committing the
1989 * ttvn change. This will avoid to send
1990 * corrupted data on tt_request
1995 orig_node
->tt_initialised
= true;
1998 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
1999 struct batadv_tt_query_packet
*tt_response
)
2001 struct batadv_orig_node
*orig_node
;
2003 orig_node
= batadv_orig_hash_find(bat_priv
, tt_response
->src
);
2007 /* Purge the old table first.. */
2008 batadv_tt_global_del_orig(bat_priv
, orig_node
, "Received full table");
2010 _batadv_tt_update_changes(bat_priv
, orig_node
,
2011 (struct batadv_tt_change
*)(tt_response
+ 1),
2012 ntohs(tt_response
->tt_data
),
2015 spin_lock_bh(&orig_node
->tt_buff_lock
);
2016 kfree(orig_node
->tt_buff
);
2017 orig_node
->tt_buff_len
= 0;
2018 orig_node
->tt_buff
= NULL
;
2019 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2021 atomic_set(&orig_node
->last_ttvn
, tt_response
->ttvn
);
2025 batadv_orig_node_free_ref(orig_node
);
2028 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2029 struct batadv_orig_node
*orig_node
,
2030 uint16_t tt_num_changes
, uint8_t ttvn
,
2031 struct batadv_tt_change
*tt_change
)
2033 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2034 tt_num_changes
, ttvn
);
2036 batadv_tt_save_orig_buffer(bat_priv
, orig_node
,
2037 (unsigned char *)tt_change
, tt_num_changes
);
2038 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2041 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const uint8_t *addr
)
2043 struct batadv_tt_local_entry
*tt_local_entry
;
2046 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
);
2047 if (!tt_local_entry
)
2049 /* Check if the client has been logically deleted (but is kept for
2050 * consistency purpose)
2052 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2053 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2058 batadv_tt_local_entry_free_ref(tt_local_entry
);
2062 void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2063 struct batadv_tt_query_packet
*tt_response
)
2065 struct batadv_tt_req_node
*node
, *safe
;
2066 struct batadv_orig_node
*orig_node
= NULL
;
2067 struct batadv_tt_change
*tt_change
;
2069 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2070 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2071 tt_response
->src
, tt_response
->ttvn
,
2072 ntohs(tt_response
->tt_data
),
2073 (tt_response
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2075 /* we should have never asked a backbone gw */
2076 if (batadv_bla_is_backbone_gw_orig(bat_priv
, tt_response
->src
))
2079 orig_node
= batadv_orig_hash_find(bat_priv
, tt_response
->src
);
2083 if (tt_response
->flags
& BATADV_TT_FULL_TABLE
) {
2084 batadv_tt_fill_gtable(bat_priv
, tt_response
);
2086 tt_change
= (struct batadv_tt_change
*)(tt_response
+ 1);
2087 batadv_tt_update_changes(bat_priv
, orig_node
,
2088 ntohs(tt_response
->tt_data
),
2089 tt_response
->ttvn
, tt_change
);
2092 /* Delete the tt_req_node from pending tt_requests list */
2093 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2094 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2095 if (!batadv_compare_eth(node
->addr
, tt_response
->src
))
2097 list_del(&node
->list
);
2100 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2102 /* Recalculate the CRC for this orig_node and store it */
2103 orig_node
->tt_crc
= batadv_tt_global_crc(bat_priv
, orig_node
);
2106 batadv_orig_node_free_ref(orig_node
);
2109 int batadv_tt_init(struct batadv_priv
*bat_priv
)
2113 ret
= batadv_tt_local_init(bat_priv
);
2117 ret
= batadv_tt_global_init(bat_priv
);
2121 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
2122 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
2123 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
2128 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
2130 struct batadv_tt_roam_node
*node
, *safe
;
2132 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2134 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2135 list_del(&node
->list
);
2139 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2142 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
2144 struct batadv_tt_roam_node
*node
, *safe
;
2146 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2147 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2148 if (!batadv_has_timed_out(node
->first_time
,
2149 BATADV_ROAMING_MAX_TIME
))
2152 list_del(&node
->list
);
2155 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2158 /* This function checks whether the client already reached the
2159 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2162 * returns true if the ROAMING_ADV can be sent, false otherwise
2164 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
,
2167 struct batadv_tt_roam_node
*tt_roam_node
;
2170 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2171 /* The new tt_req will be issued only if I'm not waiting for a
2172 * reply from the same orig_node yet
2174 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
2175 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
2178 if (batadv_has_timed_out(tt_roam_node
->first_time
,
2179 BATADV_ROAMING_MAX_TIME
))
2182 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
2183 /* Sorry, you roamed too many times! */
2190 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
2194 tt_roam_node
->first_time
= jiffies
;
2195 atomic_set(&tt_roam_node
->counter
,
2196 BATADV_ROAMING_MAX_COUNT
- 1);
2197 memcpy(tt_roam_node
->addr
, client
, ETH_ALEN
);
2199 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
2204 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2208 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
2209 struct batadv_orig_node
*orig_node
)
2211 struct sk_buff
*skb
= NULL
;
2212 struct batadv_roam_adv_packet
*roam_adv_packet
;
2214 struct batadv_hard_iface
*primary_if
;
2215 size_t len
= sizeof(*roam_adv_packet
);
2217 /* before going on we have to check whether the client has
2218 * already roamed to us too many times
2220 if (!batadv_tt_check_roam_count(bat_priv
, client
))
2223 skb
= dev_alloc_skb(sizeof(*roam_adv_packet
) + ETH_HLEN
+ NET_IP_ALIGN
);
2227 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
2229 roam_adv_packet
= (struct batadv_roam_adv_packet
*)skb_put(skb
, len
);
2231 roam_adv_packet
->header
.packet_type
= BATADV_ROAM_ADV
;
2232 roam_adv_packet
->header
.version
= BATADV_COMPAT_VERSION
;
2233 roam_adv_packet
->header
.ttl
= BATADV_TTL
;
2234 roam_adv_packet
->reserved
= 0;
2235 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2238 memcpy(roam_adv_packet
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
2239 batadv_hardif_free_ref(primary_if
);
2240 memcpy(roam_adv_packet
->dst
, orig_node
->orig
, ETH_ALEN
);
2241 memcpy(roam_adv_packet
->client
, client
, ETH_ALEN
);
2243 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2244 "Sending ROAMING_ADV to %pM (client %pM)\n",
2245 orig_node
->orig
, client
);
2247 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
2249 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
))
2258 static void batadv_tt_purge(struct work_struct
*work
)
2260 struct delayed_work
*delayed_work
;
2261 struct batadv_priv_tt
*priv_tt
;
2262 struct batadv_priv
*bat_priv
;
2264 delayed_work
= container_of(work
, struct delayed_work
, work
);
2265 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
2266 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
2268 batadv_tt_local_purge(bat_priv
);
2269 batadv_tt_global_purge(bat_priv
);
2270 batadv_tt_req_purge(bat_priv
);
2271 batadv_tt_roam_purge(bat_priv
);
2273 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
2274 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
2277 void batadv_tt_free(struct batadv_priv
*bat_priv
)
2279 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
2281 batadv_tt_local_table_free(bat_priv
);
2282 batadv_tt_global_table_free(bat_priv
);
2283 batadv_tt_req_list_free(bat_priv
);
2284 batadv_tt_changes_list_free(bat_priv
);
2285 batadv_tt_roam_list_free(bat_priv
);
2287 kfree(bat_priv
->tt
.last_changeset
);
2290 /* This function will enable or disable the specified flags for all the entries
2291 * in the given hash table and returns the number of modified entries
2293 static uint16_t batadv_tt_set_flags(struct batadv_hashtable
*hash
,
2294 uint16_t flags
, bool enable
)
2297 uint16_t changed_num
= 0;
2298 struct hlist_head
*head
;
2299 struct batadv_tt_common_entry
*tt_common_entry
;
2304 for (i
= 0; i
< hash
->size
; i
++) {
2305 head
= &hash
->table
[i
];
2308 hlist_for_each_entry_rcu(tt_common_entry
,
2311 if ((tt_common_entry
->flags
& flags
) == flags
)
2313 tt_common_entry
->flags
|= flags
;
2315 if (!(tt_common_entry
->flags
& flags
))
2317 tt_common_entry
->flags
&= ~flags
;
2327 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
2328 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
2330 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2331 struct batadv_tt_common_entry
*tt_common
;
2332 struct batadv_tt_local_entry
*tt_local
;
2333 struct hlist_node
*node_tmp
;
2334 struct hlist_head
*head
;
2335 spinlock_t
*list_lock
; /* protects write access to the hash lists */
2341 for (i
= 0; i
< hash
->size
; i
++) {
2342 head
= &hash
->table
[i
];
2343 list_lock
= &hash
->list_locks
[i
];
2345 spin_lock_bh(list_lock
);
2346 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
2348 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
2351 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2352 "Deleting local tt entry (%pM): pending\n",
2355 atomic_dec(&bat_priv
->tt
.local_entry_num
);
2356 hlist_del_rcu(&tt_common
->hash_entry
);
2357 tt_local
= container_of(tt_common
,
2358 struct batadv_tt_local_entry
,
2360 batadv_tt_local_entry_free_ref(tt_local
);
2362 spin_unlock_bh(list_lock
);
2366 static int batadv_tt_commit_changes(struct batadv_priv
*bat_priv
,
2367 unsigned char **packet_buff
,
2368 int *packet_buff_len
, int packet_min_len
)
2370 uint16_t changed_num
= 0;
2372 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1)
2375 changed_num
= batadv_tt_set_flags(bat_priv
->tt
.local_hash
,
2376 BATADV_TT_CLIENT_NEW
, false);
2378 /* all reset entries have to be counted as local entries */
2379 atomic_add(changed_num
, &bat_priv
->tt
.local_entry_num
);
2380 batadv_tt_local_purge_pending_clients(bat_priv
);
2381 bat_priv
->tt
.local_crc
= batadv_tt_local_crc(bat_priv
);
2383 /* Increment the TTVN only once per OGM interval */
2384 atomic_inc(&bat_priv
->tt
.vn
);
2385 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2386 "Local changes committed, updating to ttvn %u\n",
2387 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
2389 /* reset the sending counter */
2390 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
2392 return batadv_tt_changes_fill_buff(bat_priv
, packet_buff
,
2393 packet_buff_len
, packet_min_len
);
2396 /* when calling this function (hard_iface == primary_if) has to be true */
2397 int batadv_tt_append_diff(struct batadv_priv
*bat_priv
,
2398 unsigned char **packet_buff
, int *packet_buff_len
,
2403 /* if at least one change happened */
2404 tt_num_changes
= batadv_tt_commit_changes(bat_priv
, packet_buff
,
2408 /* if the changes have been sent often enough */
2409 if ((tt_num_changes
< 0) &&
2410 (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))) {
2411 batadv_tt_realloc_packet_buff(packet_buff
, packet_buff_len
,
2412 packet_min_len
, packet_min_len
);
2416 return tt_num_changes
;
2419 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, uint8_t *src
,
2422 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
2423 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
2426 if (!atomic_read(&bat_priv
->ap_isolation
))
2429 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
);
2430 if (!tt_local_entry
)
2433 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
);
2434 if (!tt_global_entry
)
2437 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
2443 if (tt_global_entry
)
2444 batadv_tt_global_entry_free_ref(tt_global_entry
);
2446 batadv_tt_local_entry_free_ref(tt_local_entry
);
2450 void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
2451 struct batadv_orig_node
*orig_node
,
2452 const unsigned char *tt_buff
, uint8_t tt_num_changes
,
2453 uint8_t ttvn
, uint16_t tt_crc
)
2455 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
2456 bool full_table
= true;
2457 struct batadv_tt_change
*tt_change
;
2459 /* don't care about a backbone gateways updates. */
2460 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
2463 /* orig table not initialised AND first diff is in the OGM OR the ttvn
2464 * increased by one -> we can apply the attached changes
2466 if ((!orig_node
->tt_initialised
&& ttvn
== 1) ||
2467 ttvn
- orig_ttvn
== 1) {
2468 /* the OGM could not contain the changes due to their size or
2469 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
2471 * In this case send a tt request
2473 if (!tt_num_changes
) {
2478 tt_change
= (struct batadv_tt_change
*)tt_buff
;
2479 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
2482 /* Even if we received the precomputed crc with the OGM, we
2483 * prefer to recompute it to spot any possible inconsistency
2484 * in the global table
2486 orig_node
->tt_crc
= batadv_tt_global_crc(bat_priv
, orig_node
);
2488 /* The ttvn alone is not enough to guarantee consistency
2489 * because a single value could represent different states
2490 * (due to the wrap around). Thus a node has to check whether
2491 * the resulting table (after applying the changes) is still
2492 * consistent or not. E.g. a node could disconnect while its
2493 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2494 * checking the CRC value is mandatory to detect the
2497 if (orig_node
->tt_crc
!= tt_crc
)
2500 /* if we missed more than one change or our tables are not
2501 * in sync anymore -> request fresh tt data
2503 if (!orig_node
->tt_initialised
|| ttvn
!= orig_ttvn
||
2504 orig_node
->tt_crc
!= tt_crc
) {
2506 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2507 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %#.4x last_crc: %#.4x num_changes: %u)\n",
2508 orig_node
->orig
, ttvn
, orig_ttvn
, tt_crc
,
2509 orig_node
->tt_crc
, tt_num_changes
);
2510 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
2511 tt_crc
, full_table
);
2517 /* returns true whether we know that the client has moved from its old
2518 * originator to another one. This entry is kept is still kept for consistency
2521 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
2524 struct batadv_tt_global_entry
*tt_global_entry
;
2527 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
);
2528 if (!tt_global_entry
)
2531 ret
= !!(tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
);
2532 batadv_tt_global_entry_free_ref(tt_global_entry
);
2538 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
2539 * @bat_priv: the bat priv with all the soft interface information
2540 * @addr: the MAC address of the local client to query
2542 * Returns true if the local client is known to be roaming (it is not served by
2543 * this node anymore) or not. If yes, the client is still present in the table
2544 * to keep the latter consistent with the node TTVN
2546 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
2549 struct batadv_tt_local_entry
*tt_local_entry
;
2552 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
);
2553 if (!tt_local_entry
)
2556 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
2557 batadv_tt_local_entry_free_ref(tt_local_entry
);
2562 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
2563 struct batadv_orig_node
*orig_node
,
2564 const unsigned char *addr
)
2568 /* if the originator is a backbone node (meaning it belongs to the same
2569 * LAN of this node) the temporary client must not be added because to
2570 * reach such destination the node must use the LAN instead of the mesh
2572 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
2575 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
,
2576 BATADV_TT_CLIENT_TEMP
,
2577 atomic_read(&orig_node
->last_ttvn
)))
2580 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2581 "Added temporary global client (addr: %pM orig: %pM)\n",
2582 addr
, orig_node
->orig
);