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 batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
33 struct batadv_orig_node
*orig_node
);
34 static void batadv_tt_purge(struct work_struct
*work
);
36 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
);
37 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
38 struct batadv_orig_node
*orig_node
,
39 const unsigned char *addr
,
40 const char *message
, bool roaming
);
42 /* returns 1 if they are the same mac addr */
43 static int batadv_compare_tt(const struct hlist_node
*node
, const void *data2
)
45 const void *data1
= container_of(node
, struct batadv_tt_common_entry
,
48 return (memcmp(data1
, data2
, ETH_ALEN
) == 0 ? 1 : 0);
51 static void batadv_tt_start_timer(struct batadv_priv
*bat_priv
)
53 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
54 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
55 msecs_to_jiffies(5000));
58 static struct batadv_tt_common_entry
*
59 batadv_tt_hash_find(struct batadv_hashtable
*hash
, const void *data
)
61 struct hlist_head
*head
;
62 struct hlist_node
*node
;
63 struct batadv_tt_common_entry
*tt_common_entry
;
64 struct batadv_tt_common_entry
*tt_common_entry_tmp
= NULL
;
70 index
= batadv_choose_orig(data
, hash
->size
);
71 head
= &hash
->table
[index
];
74 hlist_for_each_entry_rcu(tt_common_entry
, node
, head
, hash_entry
) {
75 if (!batadv_compare_eth(tt_common_entry
, data
))
78 if (!atomic_inc_not_zero(&tt_common_entry
->refcount
))
81 tt_common_entry_tmp
= tt_common_entry
;
86 return tt_common_entry_tmp
;
89 static struct batadv_tt_local_entry
*
90 batadv_tt_local_hash_find(struct batadv_priv
*bat_priv
, const void *data
)
92 struct batadv_tt_common_entry
*tt_common_entry
;
93 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
95 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.local_hash
, data
);
97 tt_local_entry
= container_of(tt_common_entry
,
98 struct batadv_tt_local_entry
,
100 return tt_local_entry
;
103 static struct batadv_tt_global_entry
*
104 batadv_tt_global_hash_find(struct batadv_priv
*bat_priv
, const void *data
)
106 struct batadv_tt_common_entry
*tt_common_entry
;
107 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
109 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.global_hash
, data
);
111 tt_global_entry
= container_of(tt_common_entry
,
112 struct batadv_tt_global_entry
,
114 return tt_global_entry
;
119 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry
*tt_local_entry
)
121 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
122 kfree_rcu(tt_local_entry
, common
.rcu
);
125 static void batadv_tt_global_entry_free_rcu(struct rcu_head
*rcu
)
127 struct batadv_tt_common_entry
*tt_common_entry
;
128 struct batadv_tt_global_entry
*tt_global_entry
;
130 tt_common_entry
= container_of(rcu
, struct batadv_tt_common_entry
, rcu
);
131 tt_global_entry
= container_of(tt_common_entry
,
132 struct batadv_tt_global_entry
, common
);
134 kfree(tt_global_entry
);
138 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry
*tt_global_entry
)
140 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
141 batadv_tt_global_del_orig_list(tt_global_entry
);
142 call_rcu(&tt_global_entry
->common
.rcu
,
143 batadv_tt_global_entry_free_rcu
);
147 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
149 struct batadv_tt_orig_list_entry
*orig_entry
;
151 orig_entry
= container_of(rcu
, struct batadv_tt_orig_list_entry
, rcu
);
152 batadv_orig_node_free_ref(orig_entry
->orig_node
);
157 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry
*orig_entry
)
159 if (!atomic_dec_and_test(&orig_entry
->refcount
))
161 /* to avoid race conditions, immediately decrease the tt counter */
162 atomic_dec(&orig_entry
->orig_node
->tt_size
);
163 call_rcu(&orig_entry
->rcu
, batadv_tt_orig_list_entry_free_rcu
);
166 static void batadv_tt_local_event(struct batadv_priv
*bat_priv
,
167 const uint8_t *addr
, uint8_t flags
)
169 struct batadv_tt_change_node
*tt_change_node
, *entry
, *safe
;
170 bool event_removed
= false;
171 bool del_op_requested
, del_op_entry
;
173 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
178 tt_change_node
->change
.flags
= flags
;
179 memcpy(tt_change_node
->change
.addr
, addr
, ETH_ALEN
);
181 del_op_requested
= flags
& BATADV_TT_CLIENT_DEL
;
183 /* check for ADD+DEL or DEL+ADD events */
184 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
185 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
187 if (!batadv_compare_eth(entry
->change
.addr
, addr
))
190 /* DEL+ADD in the same orig interval have no effect and can be
191 * removed to avoid silly behaviour on the receiver side. The
192 * other way around (ADD+DEL) can happen in case of roaming of
193 * a client still in the NEW state. Roaming of NEW clients is
194 * now possible due to automatically recognition of "temporary"
197 del_op_entry
= entry
->change
.flags
& BATADV_TT_CLIENT_DEL
;
198 if (!del_op_requested
&& del_op_entry
)
200 if (del_op_requested
&& !del_op_entry
)
204 list_del(&entry
->list
);
206 kfree(tt_change_node
);
207 event_removed
= true;
211 /* track the change in the OGMinterval list */
212 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
215 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
218 atomic_dec(&bat_priv
->tt
.local_changes
);
220 atomic_inc(&bat_priv
->tt
.local_changes
);
223 int batadv_tt_len(int changes_num
)
225 return changes_num
* sizeof(struct batadv_tt_change
);
228 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
230 if (bat_priv
->tt
.local_hash
)
233 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
235 if (!bat_priv
->tt
.local_hash
)
241 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
242 struct batadv_tt_global_entry
*tt_global
,
245 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
246 "Deleting global tt entry %pM: %s\n",
247 tt_global
->common
.addr
, message
);
249 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
250 batadv_choose_orig
, tt_global
->common
.addr
);
251 batadv_tt_global_entry_free_ref(tt_global
);
255 void batadv_tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
258 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
259 struct batadv_tt_local_entry
*tt_local
;
260 struct batadv_tt_global_entry
*tt_global
;
261 struct hlist_head
*head
;
262 struct hlist_node
*node
;
263 struct batadv_tt_orig_list_entry
*orig_entry
;
265 bool roamed_back
= false;
267 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
);
268 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
);
271 tt_local
->last_seen
= jiffies
;
272 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
273 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
274 "Re-adding pending client %pM\n", addr
);
275 /* whatever the reason why the PENDING flag was set,
276 * this is a client which was enqueued to be removed in
277 * this orig_interval. Since it popped up again, the
278 * flag can be reset like it was never enqueued
280 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
284 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
285 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
286 "Roaming client %pM came back to its original location\n",
288 /* the ROAM flag is set because this client roamed away
289 * and the node got a roaming_advertisement message. Now
290 * that the client popped up again at its original
291 * location such flag can be unset
293 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
299 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
303 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
304 "Creating new local tt entry: %pM (ttvn: %d)\n", addr
,
305 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
307 memcpy(tt_local
->common
.addr
, addr
, ETH_ALEN
);
308 tt_local
->common
.flags
= BATADV_NO_FLAGS
;
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 /* The local entry has to be marked as NEW to avoid to send it in
320 * a full table response going out before the next ttvn increment
321 * (consistency check)
323 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NEW
;
325 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
326 batadv_choose_orig
, &tt_local
->common
,
327 &tt_local
->common
.hash_entry
);
329 if (unlikely(hash_added
!= 0)) {
330 /* remove the reference for the hash */
331 batadv_tt_local_entry_free_ref(tt_local
);
336 batadv_tt_local_event(bat_priv
, addr
, tt_local
->common
.flags
);
339 /* Check whether it is a roaming, but don't do anything if the roaming
340 * process has already been handled
342 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
343 /* These node are probably going to update their tt table */
344 head
= &tt_global
->orig_list
;
346 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
347 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
348 orig_entry
->orig_node
);
352 batadv_tt_global_free(bat_priv
, tt_global
,
356 /* The global entry has to be marked as ROAMING and
357 * has to be kept for consistency purpose
359 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
360 tt_global
->roam_at
= jiffies
;
366 batadv_tt_local_entry_free_ref(tt_local
);
368 batadv_tt_global_entry_free_ref(tt_global
);
371 static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff
,
372 int *packet_buff_len
,
376 unsigned char *new_buff
;
378 new_buff
= kmalloc(new_packet_len
, GFP_ATOMIC
);
380 /* keep old buffer if kmalloc should fail */
382 memcpy(new_buff
, *packet_buff
, min_packet_len
);
384 *packet_buff
= new_buff
;
385 *packet_buff_len
= new_packet_len
;
389 static void batadv_tt_prepare_packet_buff(struct batadv_priv
*bat_priv
,
390 unsigned char **packet_buff
,
391 int *packet_buff_len
,
394 struct batadv_hard_iface
*primary_if
;
397 primary_if
= batadv_primary_if_get_selected(bat_priv
);
399 req_len
= min_packet_len
;
400 req_len
+= batadv_tt_len(atomic_read(&bat_priv
->tt
.local_changes
));
402 /* if we have too many changes for one packet don't send any
403 * and wait for the tt table request which will be fragmented
405 if ((!primary_if
) || (req_len
> primary_if
->soft_iface
->mtu
))
406 req_len
= min_packet_len
;
408 batadv_tt_realloc_packet_buff(packet_buff
, packet_buff_len
,
409 min_packet_len
, req_len
);
412 batadv_hardif_free_ref(primary_if
);
415 static int batadv_tt_changes_fill_buff(struct batadv_priv
*bat_priv
,
416 unsigned char **packet_buff
,
417 int *packet_buff_len
,
420 struct batadv_tt_change_node
*entry
, *safe
;
421 int count
= 0, tot_changes
= 0, new_len
;
422 unsigned char *tt_buff
;
424 batadv_tt_prepare_packet_buff(bat_priv
, packet_buff
,
425 packet_buff_len
, min_packet_len
);
427 new_len
= *packet_buff_len
- min_packet_len
;
428 tt_buff
= *packet_buff
+ min_packet_len
;
431 tot_changes
= new_len
/ batadv_tt_len(1);
433 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
434 atomic_set(&bat_priv
->tt
.local_changes
, 0);
436 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
438 if (count
< tot_changes
) {
439 memcpy(tt_buff
+ batadv_tt_len(count
),
440 &entry
->change
, sizeof(struct batadv_tt_change
));
443 list_del(&entry
->list
);
446 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
448 /* Keep the buffer for possible tt_request */
449 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
450 kfree(bat_priv
->tt
.last_changeset
);
451 bat_priv
->tt
.last_changeset_len
= 0;
452 bat_priv
->tt
.last_changeset
= NULL
;
453 /* check whether this new OGM has no changes due to size problems */
455 /* if kmalloc() fails we will reply with the full table
456 * instead of providing the diff
458 bat_priv
->tt
.last_changeset
= kmalloc(new_len
, GFP_ATOMIC
);
459 if (bat_priv
->tt
.last_changeset
) {
460 memcpy(bat_priv
->tt
.last_changeset
, tt_buff
, new_len
);
461 bat_priv
->tt
.last_changeset_len
= new_len
;
464 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
469 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
471 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
472 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
473 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
474 struct batadv_tt_common_entry
*tt_common_entry
;
475 struct batadv_hard_iface
*primary_if
;
476 struct hlist_node
*node
;
477 struct hlist_head
*head
;
480 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
485 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
486 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
488 for (i
= 0; i
< hash
->size
; i
++) {
489 head
= &hash
->table
[i
];
492 hlist_for_each_entry_rcu(tt_common_entry
, node
,
494 seq_printf(seq
, " * %pM [%c%c%c%c%c]\n",
495 tt_common_entry
->addr
,
496 (tt_common_entry
->flags
&
497 BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
498 (tt_common_entry
->flags
&
499 BATADV_TT_CLIENT_NOPURGE
? 'P' : '.'),
500 (tt_common_entry
->flags
&
501 BATADV_TT_CLIENT_NEW
? 'N' : '.'),
502 (tt_common_entry
->flags
&
503 BATADV_TT_CLIENT_PENDING
? 'X' : '.'),
504 (tt_common_entry
->flags
&
505 BATADV_TT_CLIENT_WIFI
? 'W' : '.'));
511 batadv_hardif_free_ref(primary_if
);
516 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
517 struct batadv_tt_local_entry
*tt_local_entry
,
518 uint16_t flags
, const char *message
)
520 batadv_tt_local_event(bat_priv
, tt_local_entry
->common
.addr
,
521 tt_local_entry
->common
.flags
| flags
);
523 /* The local client has to be marked as "pending to be removed" but has
524 * to be kept in the table in order to send it in a full table
525 * response issued before the net ttvn increment (consistency check)
527 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
529 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
530 "Local tt entry (%pM) pending to be removed: %s\n",
531 tt_local_entry
->common
.addr
, message
);
535 * batadv_tt_local_remove - logically remove an entry from the local table
536 * @bat_priv: the bat priv with all the soft interface information
537 * @addr: the MAC address of the client to remove
538 * @message: message to append to the log on deletion
539 * @roaming: true if the deletion is due to a roaming event
541 * Returns the flags assigned to the local entry before being deleted
543 uint16_t batadv_tt_local_remove(struct batadv_priv
*bat_priv
,
544 const uint8_t *addr
, const char *message
,
547 struct batadv_tt_local_entry
*tt_local_entry
;
548 uint16_t flags
, curr_flags
= BATADV_NO_FLAGS
;
550 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
);
554 curr_flags
= tt_local_entry
->common
.flags
;
556 flags
= BATADV_TT_CLIENT_DEL
;
557 /* if this global entry addition is due to a roaming, the node has to
558 * mark the local entry as "roamed" in order to correctly reroute
562 flags
|= BATADV_TT_CLIENT_ROAM
;
563 /* mark the local client as ROAMed */
564 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
567 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
568 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
572 /* if this client has been added right now, it is possible to
573 * immediately purge it
575 batadv_tt_local_event(bat_priv
, tt_local_entry
->common
.addr
,
576 curr_flags
| BATADV_TT_CLIENT_DEL
);
577 hlist_del_rcu(&tt_local_entry
->common
.hash_entry
);
578 batadv_tt_local_entry_free_ref(tt_local_entry
);
582 batadv_tt_local_entry_free_ref(tt_local_entry
);
587 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
588 struct hlist_head
*head
)
590 struct batadv_tt_local_entry
*tt_local_entry
;
591 struct batadv_tt_common_entry
*tt_common_entry
;
592 struct hlist_node
*node
, *node_tmp
;
594 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
, head
,
596 tt_local_entry
= container_of(tt_common_entry
,
597 struct batadv_tt_local_entry
,
599 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
602 /* entry already marked for deletion */
603 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
606 if (!batadv_has_timed_out(tt_local_entry
->last_seen
,
607 BATADV_TT_LOCAL_TIMEOUT
))
610 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
611 BATADV_TT_CLIENT_DEL
, "timed out");
615 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
)
617 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
618 struct hlist_head
*head
;
619 spinlock_t
*list_lock
; /* protects write access to the hash lists */
622 for (i
= 0; i
< hash
->size
; i
++) {
623 head
= &hash
->table
[i
];
624 list_lock
= &hash
->list_locks
[i
];
626 spin_lock_bh(list_lock
);
627 batadv_tt_local_purge_list(bat_priv
, head
);
628 spin_unlock_bh(list_lock
);
633 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
635 struct batadv_hashtable
*hash
;
636 spinlock_t
*list_lock
; /* protects write access to the hash lists */
637 struct batadv_tt_common_entry
*tt_common_entry
;
638 struct batadv_tt_local_entry
*tt_local
;
639 struct hlist_node
*node
, *node_tmp
;
640 struct hlist_head
*head
;
643 if (!bat_priv
->tt
.local_hash
)
646 hash
= bat_priv
->tt
.local_hash
;
648 for (i
= 0; i
< hash
->size
; i
++) {
649 head
= &hash
->table
[i
];
650 list_lock
= &hash
->list_locks
[i
];
652 spin_lock_bh(list_lock
);
653 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
,
656 tt_local
= container_of(tt_common_entry
,
657 struct batadv_tt_local_entry
,
659 batadv_tt_local_entry_free_ref(tt_local
);
661 spin_unlock_bh(list_lock
);
664 batadv_hash_destroy(hash
);
666 bat_priv
->tt
.local_hash
= NULL
;
669 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
671 if (bat_priv
->tt
.global_hash
)
674 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
676 if (!bat_priv
->tt
.global_hash
)
682 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
684 struct batadv_tt_change_node
*entry
, *safe
;
686 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
688 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
690 list_del(&entry
->list
);
694 atomic_set(&bat_priv
->tt
.local_changes
, 0);
695 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
698 /* retrieves the orig_tt_list_entry belonging to orig_node from the
699 * batadv_tt_global_entry list
701 * returns it with an increased refcounter, NULL if not found
703 static struct batadv_tt_orig_list_entry
*
704 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
705 const struct batadv_orig_node
*orig_node
)
707 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
708 const struct hlist_head
*head
;
709 struct hlist_node
*node
;
712 head
= &entry
->orig_list
;
713 hlist_for_each_entry_rcu(tmp_orig_entry
, node
, head
, list
) {
714 if (tmp_orig_entry
->orig_node
!= orig_node
)
716 if (!atomic_inc_not_zero(&tmp_orig_entry
->refcount
))
719 orig_entry
= tmp_orig_entry
;
727 /* find out if an orig_node is already in the list of a tt_global_entry.
728 * returns true if found, false otherwise
731 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
732 const struct batadv_orig_node
*orig_node
)
734 struct batadv_tt_orig_list_entry
*orig_entry
;
737 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
740 batadv_tt_orig_list_entry_free_ref(orig_entry
);
747 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
748 struct batadv_orig_node
*orig_node
, int ttvn
)
750 struct batadv_tt_orig_list_entry
*orig_entry
;
752 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
754 /* refresh the ttvn: the current value could be a bogus one that
755 * was added during a "temporary client detection"
757 orig_entry
->ttvn
= ttvn
;
761 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
765 INIT_HLIST_NODE(&orig_entry
->list
);
766 atomic_inc(&orig_node
->refcount
);
767 atomic_inc(&orig_node
->tt_size
);
768 orig_entry
->orig_node
= orig_node
;
769 orig_entry
->ttvn
= ttvn
;
770 atomic_set(&orig_entry
->refcount
, 2);
772 spin_lock_bh(&tt_global
->list_lock
);
773 hlist_add_head_rcu(&orig_entry
->list
,
774 &tt_global
->orig_list
);
775 spin_unlock_bh(&tt_global
->list_lock
);
778 batadv_tt_orig_list_entry_free_ref(orig_entry
);
781 /* caller must hold orig_node refcount */
782 int batadv_tt_global_add(struct batadv_priv
*bat_priv
,
783 struct batadv_orig_node
*orig_node
,
784 const unsigned char *tt_addr
, uint8_t flags
,
787 struct batadv_tt_global_entry
*tt_global_entry
;
788 struct batadv_tt_local_entry
*tt_local_entry
;
791 struct batadv_tt_common_entry
*common
;
792 uint16_t local_flags
;
794 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
);
795 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
);
797 /* if the node already has a local client for this entry, it has to wait
798 * for a roaming advertisement instead of manually messing up the global
801 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
802 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
805 if (!tt_global_entry
) {
806 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
807 if (!tt_global_entry
)
810 common
= &tt_global_entry
->common
;
811 memcpy(common
->addr
, tt_addr
, ETH_ALEN
);
813 common
->flags
= flags
;
814 tt_global_entry
->roam_at
= 0;
815 /* node must store current time in case of roaming. This is
816 * needed to purge this entry out on timeout (if nobody claims
819 if (flags
& BATADV_TT_CLIENT_ROAM
)
820 tt_global_entry
->roam_at
= jiffies
;
821 atomic_set(&common
->refcount
, 2);
822 common
->added_at
= jiffies
;
824 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
825 spin_lock_init(&tt_global_entry
->list_lock
);
827 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
829 batadv_choose_orig
, common
,
830 &common
->hash_entry
);
832 if (unlikely(hash_added
!= 0)) {
833 /* remove the reference for the hash */
834 batadv_tt_global_entry_free_ref(tt_global_entry
);
838 common
= &tt_global_entry
->common
;
839 /* If there is already a global entry, we can use this one for
841 * But if we are trying to add a temporary client then here are
842 * two options at this point:
843 * 1) the global client is not a temporary client: the global
844 * client has to be left as it is, temporary information
845 * should never override any already known client state
846 * 2) the global client is a temporary client: purge the
847 * originator list and add the new one orig_entry
849 if (flags
& BATADV_TT_CLIENT_TEMP
) {
850 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
852 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
855 batadv_tt_global_del_orig_list(tt_global_entry
);
859 /* if the client was temporary added before receiving the first
860 * OGM announcing it, we have to clear the TEMP flag
862 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
864 /* the change can carry possible "attribute" flags like the
865 * TT_CLIENT_WIFI, therefore they have to be copied in the
868 tt_global_entry
->common
.flags
|= flags
;
870 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
871 * one originator left in the list and we previously received a
872 * delete + roaming change for this originator.
874 * We should first delete the old originator before adding the
877 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
878 batadv_tt_global_del_orig_list(tt_global_entry
);
879 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
880 tt_global_entry
->roam_at
= 0;
884 /* add the new orig_entry (if needed) or update it */
885 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
887 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
888 "Creating new global tt entry: %pM (via %pM)\n",
889 common
->addr
, orig_node
->orig
);
894 /* remove address from local hash if present */
895 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
,
896 "global tt received",
897 !!(flags
& BATADV_TT_CLIENT_ROAM
));
898 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
900 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
901 /* this is a normal global add. Therefore the client is not in a
902 * roaming state anymore.
904 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
908 batadv_tt_global_entry_free_ref(tt_global_entry
);
910 batadv_tt_local_entry_free_ref(tt_local_entry
);
914 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
915 * @tt_global_entry: global translation table entry to be analyzed
917 * This functon assumes the caller holds rcu_read_lock().
918 * Returns best originator list entry or NULL on errors.
920 static struct batadv_tt_orig_list_entry
*
921 batadv_transtable_best_orig(struct batadv_tt_global_entry
*tt_global_entry
)
923 struct batadv_neigh_node
*router
= NULL
;
924 struct hlist_head
*head
;
925 struct hlist_node
*node
;
926 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
929 head
= &tt_global_entry
->orig_list
;
930 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
931 router
= batadv_orig_node_get_router(orig_entry
->orig_node
);
935 if (router
->tq_avg
> best_tq
) {
936 best_entry
= orig_entry
;
937 best_tq
= router
->tq_avg
;
940 batadv_neigh_node_free_ref(router
);
946 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
947 * for this global entry
948 * @tt_global_entry: global translation table entry to be printed
949 * @seq: debugfs table seq_file struct
951 * This functon assumes the caller holds rcu_read_lock().
954 batadv_tt_global_print_entry(struct batadv_tt_global_entry
*tt_global_entry
,
955 struct seq_file
*seq
)
957 struct hlist_head
*head
;
958 struct hlist_node
*node
;
959 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
960 struct batadv_tt_common_entry
*tt_common_entry
;
964 tt_common_entry
= &tt_global_entry
->common
;
965 flags
= tt_common_entry
->flags
;
967 best_entry
= batadv_transtable_best_orig(tt_global_entry
);
969 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
970 seq_printf(seq
, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n",
971 '*', tt_global_entry
->common
.addr
,
972 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
974 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
975 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
976 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
979 head
= &tt_global_entry
->orig_list
;
981 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
982 if (best_entry
== orig_entry
)
985 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
986 seq_printf(seq
, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n",
987 '+', tt_global_entry
->common
.addr
,
988 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
990 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
991 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
992 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
996 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
998 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
999 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1000 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1001 struct batadv_tt_common_entry
*tt_common_entry
;
1002 struct batadv_tt_global_entry
*tt_global
;
1003 struct batadv_hard_iface
*primary_if
;
1004 struct hlist_node
*node
;
1005 struct hlist_head
*head
;
1008 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1013 "Globally announced TT entries received via the mesh %s\n",
1015 seq_printf(seq
, " %-13s %s %-15s %s %s\n",
1016 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
1018 for (i
= 0; i
< hash
->size
; i
++) {
1019 head
= &hash
->table
[i
];
1022 hlist_for_each_entry_rcu(tt_common_entry
, node
,
1024 tt_global
= container_of(tt_common_entry
,
1025 struct batadv_tt_global_entry
,
1027 batadv_tt_global_print_entry(tt_global
, seq
);
1033 batadv_hardif_free_ref(primary_if
);
1037 /* deletes the orig list of a tt_global_entry */
1039 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1041 struct hlist_head
*head
;
1042 struct hlist_node
*node
, *safe
;
1043 struct batadv_tt_orig_list_entry
*orig_entry
;
1045 spin_lock_bh(&tt_global_entry
->list_lock
);
1046 head
= &tt_global_entry
->orig_list
;
1047 hlist_for_each_entry_safe(orig_entry
, node
, safe
, head
, list
) {
1048 hlist_del_rcu(node
);
1049 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1051 spin_unlock_bh(&tt_global_entry
->list_lock
);
1056 batadv_tt_global_del_orig_entry(struct batadv_priv
*bat_priv
,
1057 struct batadv_tt_global_entry
*tt_global_entry
,
1058 struct batadv_orig_node
*orig_node
,
1059 const char *message
)
1061 struct hlist_head
*head
;
1062 struct hlist_node
*node
, *safe
;
1063 struct batadv_tt_orig_list_entry
*orig_entry
;
1065 spin_lock_bh(&tt_global_entry
->list_lock
);
1066 head
= &tt_global_entry
->orig_list
;
1067 hlist_for_each_entry_safe(orig_entry
, node
, safe
, head
, list
) {
1068 if (orig_entry
->orig_node
== orig_node
) {
1069 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1070 "Deleting %pM from global tt entry %pM: %s\n",
1072 tt_global_entry
->common
.addr
, message
);
1073 hlist_del_rcu(node
);
1074 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1077 spin_unlock_bh(&tt_global_entry
->list_lock
);
1080 /* If the client is to be deleted, we check if it is the last origantor entry
1081 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1082 * timer, otherwise we simply remove the originator scheduled for deletion.
1085 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1086 struct batadv_tt_global_entry
*tt_global_entry
,
1087 struct batadv_orig_node
*orig_node
,
1088 const char *message
)
1090 bool last_entry
= true;
1091 struct hlist_head
*head
;
1092 struct hlist_node
*node
;
1093 struct batadv_tt_orig_list_entry
*orig_entry
;
1095 /* no local entry exists, case 1:
1096 * Check if this is the last one or if other entries exist.
1100 head
= &tt_global_entry
->orig_list
;
1101 hlist_for_each_entry_rcu(orig_entry
, node
, head
, list
) {
1102 if (orig_entry
->orig_node
!= orig_node
) {
1110 /* its the last one, mark for roaming. */
1111 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1112 tt_global_entry
->roam_at
= jiffies
;
1114 /* there is another entry, we can simply delete this
1115 * one and can still use the other one.
1117 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1118 orig_node
, message
);
1123 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1124 struct batadv_orig_node
*orig_node
,
1125 const unsigned char *addr
,
1126 const char *message
, bool roaming
)
1128 struct batadv_tt_global_entry
*tt_global_entry
;
1129 struct batadv_tt_local_entry
*local_entry
= NULL
;
1131 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
);
1132 if (!tt_global_entry
)
1136 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1137 orig_node
, message
);
1139 if (hlist_empty(&tt_global_entry
->orig_list
))
1140 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1146 /* if we are deleting a global entry due to a roam
1147 * event, there are two possibilities:
1148 * 1) the client roamed from node A to node B => if there
1149 * is only one originator left for this client, we mark
1150 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1151 * wait for node B to claim it. In case of timeout
1152 * the entry is purged.
1154 * If there are other originators left, we directly delete
1156 * 2) the client roamed to us => we can directly delete
1157 * the global entry, since it is useless now.
1159 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1160 tt_global_entry
->common
.addr
);
1162 /* local entry exists, case 2: client roamed to us. */
1163 batadv_tt_global_del_orig_list(tt_global_entry
);
1164 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1166 /* no local entry exists, case 1: check for roaming */
1167 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1168 orig_node
, message
);
1172 if (tt_global_entry
)
1173 batadv_tt_global_entry_free_ref(tt_global_entry
);
1175 batadv_tt_local_entry_free_ref(local_entry
);
1178 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1179 struct batadv_orig_node
*orig_node
,
1180 const char *message
)
1182 struct batadv_tt_global_entry
*tt_global
;
1183 struct batadv_tt_common_entry
*tt_common_entry
;
1185 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1186 struct hlist_node
*node
, *safe
;
1187 struct hlist_head
*head
;
1188 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1193 for (i
= 0; i
< hash
->size
; i
++) {
1194 head
= &hash
->table
[i
];
1195 list_lock
= &hash
->list_locks
[i
];
1197 spin_lock_bh(list_lock
);
1198 hlist_for_each_entry_safe(tt_common_entry
, node
, safe
,
1200 tt_global
= container_of(tt_common_entry
,
1201 struct batadv_tt_global_entry
,
1204 batadv_tt_global_del_orig_entry(bat_priv
, tt_global
,
1205 orig_node
, message
);
1207 if (hlist_empty(&tt_global
->orig_list
)) {
1208 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1209 "Deleting global tt entry %pM: %s\n",
1210 tt_global
->common
.addr
, message
);
1211 hlist_del_rcu(node
);
1212 batadv_tt_global_entry_free_ref(tt_global
);
1215 spin_unlock_bh(list_lock
);
1217 orig_node
->tt_initialised
= false;
1220 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1224 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1225 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1227 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1228 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1230 *msg
= "Roaming timeout\n";
1233 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1234 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1236 *msg
= "Temporary client timeout\n";
1242 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1244 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1245 struct hlist_head
*head
;
1246 struct hlist_node
*node
, *node_tmp
;
1247 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1250 struct batadv_tt_common_entry
*tt_common
;
1251 struct batadv_tt_global_entry
*tt_global
;
1253 for (i
= 0; i
< hash
->size
; i
++) {
1254 head
= &hash
->table
[i
];
1255 list_lock
= &hash
->list_locks
[i
];
1257 spin_lock_bh(list_lock
);
1258 hlist_for_each_entry_safe(tt_common
, node
, node_tmp
, head
,
1260 tt_global
= container_of(tt_common
,
1261 struct batadv_tt_global_entry
,
1264 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1267 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1268 "Deleting global tt entry (%pM): %s\n",
1269 tt_global
->common
.addr
, msg
);
1271 hlist_del_rcu(node
);
1273 batadv_tt_global_entry_free_ref(tt_global
);
1275 spin_unlock_bh(list_lock
);
1279 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1281 struct batadv_hashtable
*hash
;
1282 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1283 struct batadv_tt_common_entry
*tt_common_entry
;
1284 struct batadv_tt_global_entry
*tt_global
;
1285 struct hlist_node
*node
, *node_tmp
;
1286 struct hlist_head
*head
;
1289 if (!bat_priv
->tt
.global_hash
)
1292 hash
= bat_priv
->tt
.global_hash
;
1294 for (i
= 0; i
< hash
->size
; i
++) {
1295 head
= &hash
->table
[i
];
1296 list_lock
= &hash
->list_locks
[i
];
1298 spin_lock_bh(list_lock
);
1299 hlist_for_each_entry_safe(tt_common_entry
, node
, node_tmp
,
1301 hlist_del_rcu(node
);
1302 tt_global
= container_of(tt_common_entry
,
1303 struct batadv_tt_global_entry
,
1305 batadv_tt_global_entry_free_ref(tt_global
);
1307 spin_unlock_bh(list_lock
);
1310 batadv_hash_destroy(hash
);
1312 bat_priv
->tt
.global_hash
= NULL
;
1316 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
1317 struct batadv_tt_global_entry
*tt_global_entry
)
1321 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
1322 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
1328 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
1330 const uint8_t *addr
)
1332 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
1333 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
1334 struct batadv_orig_node
*orig_node
= NULL
;
1335 struct batadv_tt_orig_list_entry
*best_entry
;
1337 if (src
&& atomic_read(&bat_priv
->ap_isolation
)) {
1338 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
);
1339 if (!tt_local_entry
||
1340 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
1344 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
);
1345 if (!tt_global_entry
)
1348 /* check whether the clients should not communicate due to AP
1351 if (tt_local_entry
&&
1352 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
1356 best_entry
= batadv_transtable_best_orig(tt_global_entry
);
1357 /* found anything? */
1359 orig_node
= best_entry
->orig_node
;
1360 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1365 if (tt_global_entry
)
1366 batadv_tt_global_entry_free_ref(tt_global_entry
);
1368 batadv_tt_local_entry_free_ref(tt_local_entry
);
1373 /* Calculates the checksum of the local table of a given orig_node */
1374 static uint16_t batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
1375 struct batadv_orig_node
*orig_node
)
1377 uint16_t total
= 0, total_one
;
1378 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1379 struct batadv_tt_common_entry
*tt_common
;
1380 struct batadv_tt_global_entry
*tt_global
;
1381 struct hlist_node
*node
;
1382 struct hlist_head
*head
;
1386 for (i
= 0; i
< hash
->size
; i
++) {
1387 head
= &hash
->table
[i
];
1390 hlist_for_each_entry_rcu(tt_common
, node
, head
, hash_entry
) {
1391 tt_global
= container_of(tt_common
,
1392 struct batadv_tt_global_entry
,
1394 /* Roaming clients are in the global table for
1395 * consistency only. They don't have to be
1396 * taken into account while computing the
1399 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
1401 /* Temporary clients have not been announced yet, so
1402 * they have to be skipped while computing the global
1405 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
1408 /* find out if this global entry is announced by this
1411 if (!batadv_tt_global_entry_has_orig(tt_global
,
1416 for (j
= 0; j
< ETH_ALEN
; j
++)
1417 total_one
= crc16_byte(total_one
,
1418 tt_common
->addr
[j
]);
1427 /* Calculates the checksum of the local table */
1428 static uint16_t batadv_tt_local_crc(struct batadv_priv
*bat_priv
)
1430 uint16_t total
= 0, total_one
;
1431 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1432 struct batadv_tt_common_entry
*tt_common
;
1433 struct hlist_node
*node
;
1434 struct hlist_head
*head
;
1438 for (i
= 0; i
< hash
->size
; i
++) {
1439 head
= &hash
->table
[i
];
1442 hlist_for_each_entry_rcu(tt_common
, node
, head
, hash_entry
) {
1443 /* not yet committed clients have not to be taken into
1444 * account while computing the CRC
1446 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
1449 for (j
= 0; j
< ETH_ALEN
; j
++)
1450 total_one
= crc16_byte(total_one
,
1451 tt_common
->addr
[j
]);
1460 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
1462 struct batadv_tt_req_node
*node
, *safe
;
1464 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1466 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
1467 list_del(&node
->list
);
1471 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1474 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
1475 struct batadv_orig_node
*orig_node
,
1476 const unsigned char *tt_buff
,
1477 uint8_t tt_num_changes
)
1479 uint16_t tt_buff_len
= batadv_tt_len(tt_num_changes
);
1481 /* Replace the old buffer only if I received something in the
1482 * last OGM (the OGM could carry no changes)
1484 spin_lock_bh(&orig_node
->tt_buff_lock
);
1485 if (tt_buff_len
> 0) {
1486 kfree(orig_node
->tt_buff
);
1487 orig_node
->tt_buff_len
= 0;
1488 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
1489 if (orig_node
->tt_buff
) {
1490 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
1491 orig_node
->tt_buff_len
= tt_buff_len
;
1494 spin_unlock_bh(&orig_node
->tt_buff_lock
);
1497 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
1499 struct batadv_tt_req_node
*node
, *safe
;
1501 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1502 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
1503 if (batadv_has_timed_out(node
->issued_at
,
1504 BATADV_TT_REQUEST_TIMEOUT
)) {
1505 list_del(&node
->list
);
1509 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1512 /* returns the pointer to the new tt_req_node struct if no request
1513 * has already been issued for this orig_node, NULL otherwise
1515 static struct batadv_tt_req_node
*
1516 batadv_new_tt_req_node(struct batadv_priv
*bat_priv
,
1517 struct batadv_orig_node
*orig_node
)
1519 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
1521 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1522 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
1523 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
1524 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
1525 BATADV_TT_REQUEST_TIMEOUT
))
1529 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
1533 memcpy(tt_req_node
->addr
, orig_node
->orig
, ETH_ALEN
);
1534 tt_req_node
->issued_at
= jiffies
;
1536 list_add(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
1538 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1542 /* data_ptr is useless here, but has to be kept to respect the prototype */
1543 static int batadv_tt_local_valid_entry(const void *entry_ptr
,
1544 const void *data_ptr
)
1546 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
1548 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
1553 static int batadv_tt_global_valid(const void *entry_ptr
,
1554 const void *data_ptr
)
1556 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
1557 const struct batadv_tt_global_entry
*tt_global_entry
;
1558 const struct batadv_orig_node
*orig_node
= data_ptr
;
1560 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
1561 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
1564 tt_global_entry
= container_of(tt_common_entry
,
1565 struct batadv_tt_global_entry
,
1568 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
1571 static struct sk_buff
*
1572 batadv_tt_response_fill_table(uint16_t tt_len
, uint8_t ttvn
,
1573 struct batadv_hashtable
*hash
,
1574 struct batadv_hard_iface
*primary_if
,
1575 int (*valid_cb
)(const void *, const void *),
1578 struct batadv_tt_common_entry
*tt_common_entry
;
1579 struct batadv_tt_query_packet
*tt_response
;
1580 struct batadv_tt_change
*tt_change
;
1581 struct hlist_node
*node
;
1582 struct hlist_head
*head
;
1583 struct sk_buff
*skb
= NULL
;
1584 uint16_t tt_tot
, tt_count
;
1585 ssize_t tt_query_size
= sizeof(struct batadv_tt_query_packet
);
1589 if (tt_query_size
+ tt_len
> primary_if
->soft_iface
->mtu
) {
1590 tt_len
= primary_if
->soft_iface
->mtu
- tt_query_size
;
1591 tt_len
-= tt_len
% sizeof(struct batadv_tt_change
);
1593 tt_tot
= tt_len
/ sizeof(struct batadv_tt_change
);
1595 len
= tt_query_size
+ tt_len
;
1596 skb
= dev_alloc_skb(len
+ ETH_HLEN
+ NET_IP_ALIGN
);
1600 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
1601 tt_response
= (struct batadv_tt_query_packet
*)skb_put(skb
, len
);
1602 tt_response
->ttvn
= ttvn
;
1604 tt_change
= (struct batadv_tt_change
*)(skb
->data
+ tt_query_size
);
1608 for (i
= 0; i
< hash
->size
; i
++) {
1609 head
= &hash
->table
[i
];
1611 hlist_for_each_entry_rcu(tt_common_entry
, node
,
1613 if (tt_count
== tt_tot
)
1616 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
1619 memcpy(tt_change
->addr
, tt_common_entry
->addr
,
1621 tt_change
->flags
= tt_common_entry
->flags
;
1629 /* store in the message the number of entries we have successfully
1632 tt_response
->tt_data
= htons(tt_count
);
1638 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
1639 struct batadv_orig_node
*dst_orig_node
,
1640 uint8_t ttvn
, uint16_t tt_crc
,
1643 struct sk_buff
*skb
= NULL
;
1644 struct batadv_tt_query_packet
*tt_request
;
1645 struct batadv_hard_iface
*primary_if
;
1646 struct batadv_tt_req_node
*tt_req_node
= NULL
;
1650 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1654 /* The new tt_req will be issued only if I'm not waiting for a
1655 * reply from the same orig_node yet
1657 tt_req_node
= batadv_new_tt_req_node(bat_priv
, dst_orig_node
);
1661 skb
= dev_alloc_skb(sizeof(*tt_request
) + ETH_HLEN
+ NET_IP_ALIGN
);
1665 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
1667 tt_req_len
= sizeof(*tt_request
);
1668 tt_request
= (struct batadv_tt_query_packet
*)skb_put(skb
, tt_req_len
);
1670 tt_request
->header
.packet_type
= BATADV_TT_QUERY
;
1671 tt_request
->header
.version
= BATADV_COMPAT_VERSION
;
1672 memcpy(tt_request
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1673 memcpy(tt_request
->dst
, dst_orig_node
->orig
, ETH_ALEN
);
1674 tt_request
->header
.ttl
= BATADV_TTL
;
1675 tt_request
->ttvn
= ttvn
;
1676 tt_request
->tt_data
= htons(tt_crc
);
1677 tt_request
->flags
= BATADV_TT_REQUEST
;
1680 tt_request
->flags
|= BATADV_TT_FULL_TABLE
;
1682 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
1683 dst_orig_node
->orig
, (full_table
? 'F' : '.'));
1685 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
1687 if (batadv_send_skb_to_orig(skb
, dst_orig_node
, NULL
))
1692 batadv_hardif_free_ref(primary_if
);
1695 if (ret
&& tt_req_node
) {
1696 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1697 list_del(&tt_req_node
->list
);
1698 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1705 batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
1706 struct batadv_tt_query_packet
*tt_request
)
1708 struct batadv_orig_node
*req_dst_orig_node
;
1709 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
1710 struct batadv_hard_iface
*primary_if
= NULL
;
1711 uint8_t orig_ttvn
, req_ttvn
, ttvn
;
1713 unsigned char *tt_buff
;
1715 uint16_t tt_len
, tt_tot
;
1716 struct sk_buff
*skb
= NULL
;
1717 struct batadv_tt_query_packet
*tt_response
;
1718 uint8_t *packet_pos
;
1721 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1722 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1723 tt_request
->src
, tt_request
->ttvn
, tt_request
->dst
,
1724 (tt_request
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
1726 /* Let's get the orig node of the REAL destination */
1727 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, tt_request
->dst
);
1728 if (!req_dst_orig_node
)
1731 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, tt_request
->src
);
1732 if (!res_dst_orig_node
)
1735 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1739 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
1740 req_ttvn
= tt_request
->ttvn
;
1742 /* I don't have the requested data */
1743 if (orig_ttvn
!= req_ttvn
||
1744 tt_request
->tt_data
!= htons(req_dst_orig_node
->tt_crc
))
1747 /* If the full table has been explicitly requested */
1748 if (tt_request
->flags
& BATADV_TT_FULL_TABLE
||
1749 !req_dst_orig_node
->tt_buff
)
1754 /* In this version, fragmentation is not implemented, then
1755 * I'll send only one packet with as much TT entries as I can
1758 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
1759 tt_len
= req_dst_orig_node
->tt_buff_len
;
1760 tt_tot
= tt_len
/ sizeof(struct batadv_tt_change
);
1762 len
= sizeof(*tt_response
) + tt_len
;
1763 skb
= dev_alloc_skb(len
+ ETH_HLEN
+ NET_IP_ALIGN
);
1767 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
1768 packet_pos
= skb_put(skb
, len
);
1769 tt_response
= (struct batadv_tt_query_packet
*)packet_pos
;
1770 tt_response
->ttvn
= req_ttvn
;
1771 tt_response
->tt_data
= htons(tt_tot
);
1773 tt_buff
= skb
->data
+ sizeof(*tt_response
);
1774 /* Copy the last orig_node's OGM buffer */
1775 memcpy(tt_buff
, req_dst_orig_node
->tt_buff
,
1776 req_dst_orig_node
->tt_buff_len
);
1778 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
1780 tt_len
= (uint16_t)atomic_read(&req_dst_orig_node
->tt_size
);
1781 tt_len
*= sizeof(struct batadv_tt_change
);
1782 ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
1784 skb
= batadv_tt_response_fill_table(tt_len
, ttvn
,
1785 bat_priv
->tt
.global_hash
,
1787 batadv_tt_global_valid
,
1792 tt_response
= (struct batadv_tt_query_packet
*)skb
->data
;
1795 tt_response
->header
.packet_type
= BATADV_TT_QUERY
;
1796 tt_response
->header
.version
= BATADV_COMPAT_VERSION
;
1797 tt_response
->header
.ttl
= BATADV_TTL
;
1798 memcpy(tt_response
->src
, req_dst_orig_node
->orig
, ETH_ALEN
);
1799 memcpy(tt_response
->dst
, tt_request
->src
, ETH_ALEN
);
1800 tt_response
->flags
= BATADV_TT_RESPONSE
;
1803 tt_response
->flags
|= BATADV_TT_FULL_TABLE
;
1805 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1806 "Sending TT_RESPONSE %pM for %pM (ttvn: %u)\n",
1807 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
, req_ttvn
);
1809 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
1811 if (batadv_send_skb_to_orig(skb
, res_dst_orig_node
, NULL
))
1816 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
1819 if (res_dst_orig_node
)
1820 batadv_orig_node_free_ref(res_dst_orig_node
);
1821 if (req_dst_orig_node
)
1822 batadv_orig_node_free_ref(req_dst_orig_node
);
1824 batadv_hardif_free_ref(primary_if
);
1832 batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
1833 struct batadv_tt_query_packet
*tt_request
)
1835 struct batadv_orig_node
*orig_node
;
1836 struct batadv_hard_iface
*primary_if
= NULL
;
1837 uint8_t my_ttvn
, req_ttvn
, ttvn
;
1839 unsigned char *tt_buff
;
1841 uint16_t tt_len
, tt_tot
;
1842 struct sk_buff
*skb
= NULL
;
1843 struct batadv_tt_query_packet
*tt_response
;
1844 uint8_t *packet_pos
;
1847 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1848 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1849 tt_request
->src
, tt_request
->ttvn
,
1850 (tt_request
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
1853 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
1854 req_ttvn
= tt_request
->ttvn
;
1856 orig_node
= batadv_orig_hash_find(bat_priv
, tt_request
->src
);
1860 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1864 /* If the full table has been explicitly requested or the gap
1865 * is too big send the whole local translation table
1867 if (tt_request
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
1868 !bat_priv
->tt
.last_changeset
)
1873 /* In this version, fragmentation is not implemented, then
1874 * I'll send only one packet with as much TT entries as I can
1877 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
1878 tt_len
= bat_priv
->tt
.last_changeset_len
;
1879 tt_tot
= tt_len
/ sizeof(struct batadv_tt_change
);
1881 len
= sizeof(*tt_response
) + tt_len
;
1882 skb
= dev_alloc_skb(len
+ ETH_HLEN
+ NET_IP_ALIGN
);
1886 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
1887 packet_pos
= skb_put(skb
, len
);
1888 tt_response
= (struct batadv_tt_query_packet
*)packet_pos
;
1889 tt_response
->ttvn
= req_ttvn
;
1890 tt_response
->tt_data
= htons(tt_tot
);
1892 tt_buff
= skb
->data
+ sizeof(*tt_response
);
1893 memcpy(tt_buff
, bat_priv
->tt
.last_changeset
,
1894 bat_priv
->tt
.last_changeset_len
);
1895 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
1897 tt_len
= (uint16_t)atomic_read(&bat_priv
->tt
.local_entry_num
);
1898 tt_len
*= sizeof(struct batadv_tt_change
);
1899 ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
1901 skb
= batadv_tt_response_fill_table(tt_len
, ttvn
,
1902 bat_priv
->tt
.local_hash
,
1904 batadv_tt_local_valid_entry
,
1909 tt_response
= (struct batadv_tt_query_packet
*)skb
->data
;
1912 tt_response
->header
.packet_type
= BATADV_TT_QUERY
;
1913 tt_response
->header
.version
= BATADV_COMPAT_VERSION
;
1914 tt_response
->header
.ttl
= BATADV_TTL
;
1915 memcpy(tt_response
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1916 memcpy(tt_response
->dst
, tt_request
->src
, ETH_ALEN
);
1917 tt_response
->flags
= BATADV_TT_RESPONSE
;
1920 tt_response
->flags
|= BATADV_TT_FULL_TABLE
;
1922 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1923 "Sending TT_RESPONSE to %pM [%c]\n",
1925 (tt_response
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
1927 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
1929 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
))
1934 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
1937 batadv_orig_node_free_ref(orig_node
);
1939 batadv_hardif_free_ref(primary_if
);
1942 /* This packet was for me, so it doesn't need to be re-routed */
1946 bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
1947 struct batadv_tt_query_packet
*tt_request
)
1949 if (batadv_is_my_mac(tt_request
->dst
)) {
1950 /* don't answer backbone gws! */
1951 if (batadv_bla_is_backbone_gw_orig(bat_priv
, tt_request
->src
))
1954 return batadv_send_my_tt_response(bat_priv
, tt_request
);
1956 return batadv_send_other_tt_response(bat_priv
, tt_request
);
1960 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
1961 struct batadv_orig_node
*orig_node
,
1962 struct batadv_tt_change
*tt_change
,
1963 uint16_t tt_num_changes
, uint8_t ttvn
)
1968 for (i
= 0; i
< tt_num_changes
; i
++) {
1969 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
1970 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
1971 batadv_tt_global_del(bat_priv
, orig_node
,
1972 (tt_change
+ i
)->addr
,
1973 "tt removed by changes",
1976 if (!batadv_tt_global_add(bat_priv
, orig_node
,
1977 (tt_change
+ i
)->addr
,
1978 (tt_change
+ i
)->flags
, ttvn
))
1979 /* In case of problem while storing a
1980 * global_entry, we stop the updating
1981 * procedure without committing the
1982 * ttvn change. This will avoid to send
1983 * corrupted data on tt_request
1988 orig_node
->tt_initialised
= true;
1991 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
1992 struct batadv_tt_query_packet
*tt_response
)
1994 struct batadv_orig_node
*orig_node
;
1996 orig_node
= batadv_orig_hash_find(bat_priv
, tt_response
->src
);
2000 /* Purge the old table first.. */
2001 batadv_tt_global_del_orig(bat_priv
, orig_node
, "Received full table");
2003 _batadv_tt_update_changes(bat_priv
, orig_node
,
2004 (struct batadv_tt_change
*)(tt_response
+ 1),
2005 ntohs(tt_response
->tt_data
),
2008 spin_lock_bh(&orig_node
->tt_buff_lock
);
2009 kfree(orig_node
->tt_buff
);
2010 orig_node
->tt_buff_len
= 0;
2011 orig_node
->tt_buff
= NULL
;
2012 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2014 atomic_set(&orig_node
->last_ttvn
, tt_response
->ttvn
);
2018 batadv_orig_node_free_ref(orig_node
);
2021 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2022 struct batadv_orig_node
*orig_node
,
2023 uint16_t tt_num_changes
, uint8_t ttvn
,
2024 struct batadv_tt_change
*tt_change
)
2026 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2027 tt_num_changes
, ttvn
);
2029 batadv_tt_save_orig_buffer(bat_priv
, orig_node
,
2030 (unsigned char *)tt_change
, tt_num_changes
);
2031 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2034 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const uint8_t *addr
)
2036 struct batadv_tt_local_entry
*tt_local_entry
;
2039 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
);
2040 if (!tt_local_entry
)
2042 /* Check if the client has been logically deleted (but is kept for
2043 * consistency purpose)
2045 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2046 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2051 batadv_tt_local_entry_free_ref(tt_local_entry
);
2055 void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2056 struct batadv_tt_query_packet
*tt_response
)
2058 struct batadv_tt_req_node
*node
, *safe
;
2059 struct batadv_orig_node
*orig_node
= NULL
;
2060 struct batadv_tt_change
*tt_change
;
2062 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2063 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2064 tt_response
->src
, tt_response
->ttvn
,
2065 ntohs(tt_response
->tt_data
),
2066 (tt_response
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2068 /* we should have never asked a backbone gw */
2069 if (batadv_bla_is_backbone_gw_orig(bat_priv
, tt_response
->src
))
2072 orig_node
= batadv_orig_hash_find(bat_priv
, tt_response
->src
);
2076 if (tt_response
->flags
& BATADV_TT_FULL_TABLE
) {
2077 batadv_tt_fill_gtable(bat_priv
, tt_response
);
2079 tt_change
= (struct batadv_tt_change
*)(tt_response
+ 1);
2080 batadv_tt_update_changes(bat_priv
, orig_node
,
2081 ntohs(tt_response
->tt_data
),
2082 tt_response
->ttvn
, tt_change
);
2085 /* Delete the tt_req_node from pending tt_requests list */
2086 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2087 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2088 if (!batadv_compare_eth(node
->addr
, tt_response
->src
))
2090 list_del(&node
->list
);
2093 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2095 /* Recalculate the CRC for this orig_node and store it */
2096 orig_node
->tt_crc
= batadv_tt_global_crc(bat_priv
, orig_node
);
2099 batadv_orig_node_free_ref(orig_node
);
2102 int batadv_tt_init(struct batadv_priv
*bat_priv
)
2106 ret
= batadv_tt_local_init(bat_priv
);
2110 ret
= batadv_tt_global_init(bat_priv
);
2114 batadv_tt_start_timer(bat_priv
);
2119 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
2121 struct batadv_tt_roam_node
*node
, *safe
;
2123 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2125 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2126 list_del(&node
->list
);
2130 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2133 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
2135 struct batadv_tt_roam_node
*node
, *safe
;
2137 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2138 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2139 if (!batadv_has_timed_out(node
->first_time
,
2140 BATADV_ROAMING_MAX_TIME
))
2143 list_del(&node
->list
);
2146 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2149 /* This function checks whether the client already reached the
2150 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2153 * returns true if the ROAMING_ADV can be sent, false otherwise
2155 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
,
2158 struct batadv_tt_roam_node
*tt_roam_node
;
2161 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2162 /* The new tt_req will be issued only if I'm not waiting for a
2163 * reply from the same orig_node yet
2165 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
2166 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
2169 if (batadv_has_timed_out(tt_roam_node
->first_time
,
2170 BATADV_ROAMING_MAX_TIME
))
2173 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
2174 /* Sorry, you roamed too many times! */
2181 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
2185 tt_roam_node
->first_time
= jiffies
;
2186 atomic_set(&tt_roam_node
->counter
,
2187 BATADV_ROAMING_MAX_COUNT
- 1);
2188 memcpy(tt_roam_node
->addr
, client
, ETH_ALEN
);
2190 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
2195 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2199 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
2200 struct batadv_orig_node
*orig_node
)
2202 struct sk_buff
*skb
= NULL
;
2203 struct batadv_roam_adv_packet
*roam_adv_packet
;
2205 struct batadv_hard_iface
*primary_if
;
2206 size_t len
= sizeof(*roam_adv_packet
);
2208 /* before going on we have to check whether the client has
2209 * already roamed to us too many times
2211 if (!batadv_tt_check_roam_count(bat_priv
, client
))
2214 skb
= dev_alloc_skb(sizeof(*roam_adv_packet
) + ETH_HLEN
+ NET_IP_ALIGN
);
2218 skb_reserve(skb
, ETH_HLEN
+ NET_IP_ALIGN
);
2220 roam_adv_packet
= (struct batadv_roam_adv_packet
*)skb_put(skb
, len
);
2222 roam_adv_packet
->header
.packet_type
= BATADV_ROAM_ADV
;
2223 roam_adv_packet
->header
.version
= BATADV_COMPAT_VERSION
;
2224 roam_adv_packet
->header
.ttl
= BATADV_TTL
;
2225 roam_adv_packet
->reserved
= 0;
2226 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2229 memcpy(roam_adv_packet
->src
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
2230 batadv_hardif_free_ref(primary_if
);
2231 memcpy(roam_adv_packet
->dst
, orig_node
->orig
, ETH_ALEN
);
2232 memcpy(roam_adv_packet
->client
, client
, ETH_ALEN
);
2234 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2235 "Sending ROAMING_ADV to %pM (client %pM)\n",
2236 orig_node
->orig
, client
);
2238 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
2240 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
))
2249 static void batadv_tt_purge(struct work_struct
*work
)
2251 struct delayed_work
*delayed_work
;
2252 struct batadv_priv_tt
*priv_tt
;
2253 struct batadv_priv
*bat_priv
;
2255 delayed_work
= container_of(work
, struct delayed_work
, work
);
2256 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
2257 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
2259 batadv_tt_local_purge(bat_priv
);
2260 batadv_tt_global_purge(bat_priv
);
2261 batadv_tt_req_purge(bat_priv
);
2262 batadv_tt_roam_purge(bat_priv
);
2264 batadv_tt_start_timer(bat_priv
);
2267 void batadv_tt_free(struct batadv_priv
*bat_priv
)
2269 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
2271 batadv_tt_local_table_free(bat_priv
);
2272 batadv_tt_global_table_free(bat_priv
);
2273 batadv_tt_req_list_free(bat_priv
);
2274 batadv_tt_changes_list_free(bat_priv
);
2275 batadv_tt_roam_list_free(bat_priv
);
2277 kfree(bat_priv
->tt
.last_changeset
);
2280 /* This function will enable or disable the specified flags for all the entries
2281 * in the given hash table and returns the number of modified entries
2283 static uint16_t batadv_tt_set_flags(struct batadv_hashtable
*hash
,
2284 uint16_t flags
, bool enable
)
2287 uint16_t changed_num
= 0;
2288 struct hlist_head
*head
;
2289 struct hlist_node
*node
;
2290 struct batadv_tt_common_entry
*tt_common_entry
;
2295 for (i
= 0; i
< hash
->size
; i
++) {
2296 head
= &hash
->table
[i
];
2299 hlist_for_each_entry_rcu(tt_common_entry
, node
,
2302 if ((tt_common_entry
->flags
& flags
) == flags
)
2304 tt_common_entry
->flags
|= flags
;
2306 if (!(tt_common_entry
->flags
& flags
))
2308 tt_common_entry
->flags
&= ~flags
;
2318 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
2319 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
2321 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2322 struct batadv_tt_common_entry
*tt_common
;
2323 struct batadv_tt_local_entry
*tt_local
;
2324 struct hlist_node
*node
, *node_tmp
;
2325 struct hlist_head
*head
;
2326 spinlock_t
*list_lock
; /* protects write access to the hash lists */
2332 for (i
= 0; i
< hash
->size
; i
++) {
2333 head
= &hash
->table
[i
];
2334 list_lock
= &hash
->list_locks
[i
];
2336 spin_lock_bh(list_lock
);
2337 hlist_for_each_entry_safe(tt_common
, node
, node_tmp
, head
,
2339 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
2342 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2343 "Deleting local tt entry (%pM): pending\n",
2346 atomic_dec(&bat_priv
->tt
.local_entry_num
);
2347 hlist_del_rcu(node
);
2348 tt_local
= container_of(tt_common
,
2349 struct batadv_tt_local_entry
,
2351 batadv_tt_local_entry_free_ref(tt_local
);
2353 spin_unlock_bh(list_lock
);
2358 static int batadv_tt_commit_changes(struct batadv_priv
*bat_priv
,
2359 unsigned char **packet_buff
,
2360 int *packet_buff_len
, int packet_min_len
)
2362 uint16_t changed_num
= 0;
2364 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1)
2367 changed_num
= batadv_tt_set_flags(bat_priv
->tt
.local_hash
,
2368 BATADV_TT_CLIENT_NEW
, false);
2370 /* all reset entries have to be counted as local entries */
2371 atomic_add(changed_num
, &bat_priv
->tt
.local_entry_num
);
2372 batadv_tt_local_purge_pending_clients(bat_priv
);
2373 bat_priv
->tt
.local_crc
= batadv_tt_local_crc(bat_priv
);
2375 /* Increment the TTVN only once per OGM interval */
2376 atomic_inc(&bat_priv
->tt
.vn
);
2377 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2378 "Local changes committed, updating to ttvn %u\n",
2379 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
2381 /* reset the sending counter */
2382 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
2384 return batadv_tt_changes_fill_buff(bat_priv
, packet_buff
,
2385 packet_buff_len
, packet_min_len
);
2388 /* when calling this function (hard_iface == primary_if) has to be true */
2389 int batadv_tt_append_diff(struct batadv_priv
*bat_priv
,
2390 unsigned char **packet_buff
, int *packet_buff_len
,
2395 /* if at least one change happened */
2396 tt_num_changes
= batadv_tt_commit_changes(bat_priv
, packet_buff
,
2400 /* if the changes have been sent often enough */
2401 if ((tt_num_changes
< 0) &&
2402 (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))) {
2403 batadv_tt_realloc_packet_buff(packet_buff
, packet_buff_len
,
2404 packet_min_len
, packet_min_len
);
2408 return tt_num_changes
;
2411 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, uint8_t *src
,
2414 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
2415 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
2418 if (!atomic_read(&bat_priv
->ap_isolation
))
2421 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
);
2422 if (!tt_local_entry
)
2425 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
);
2426 if (!tt_global_entry
)
2429 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
2435 if (tt_global_entry
)
2436 batadv_tt_global_entry_free_ref(tt_global_entry
);
2438 batadv_tt_local_entry_free_ref(tt_local_entry
);
2442 void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
2443 struct batadv_orig_node
*orig_node
,
2444 const unsigned char *tt_buff
, uint8_t tt_num_changes
,
2445 uint8_t ttvn
, uint16_t tt_crc
)
2447 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
2448 bool full_table
= true;
2449 struct batadv_tt_change
*tt_change
;
2451 /* don't care about a backbone gateways updates. */
2452 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
2455 /* orig table not initialised AND first diff is in the OGM OR the ttvn
2456 * increased by one -> we can apply the attached changes
2458 if ((!orig_node
->tt_initialised
&& ttvn
== 1) ||
2459 ttvn
- orig_ttvn
== 1) {
2460 /* the OGM could not contain the changes due to their size or
2461 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
2463 * In this case send a tt request
2465 if (!tt_num_changes
) {
2470 tt_change
= (struct batadv_tt_change
*)tt_buff
;
2471 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
2474 /* Even if we received the precomputed crc with the OGM, we
2475 * prefer to recompute it to spot any possible inconsistency
2476 * in the global table
2478 orig_node
->tt_crc
= batadv_tt_global_crc(bat_priv
, orig_node
);
2480 /* The ttvn alone is not enough to guarantee consistency
2481 * because a single value could represent different states
2482 * (due to the wrap around). Thus a node has to check whether
2483 * the resulting table (after applying the changes) is still
2484 * consistent or not. E.g. a node could disconnect while its
2485 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2486 * checking the CRC value is mandatory to detect the
2489 if (orig_node
->tt_crc
!= tt_crc
)
2492 /* if we missed more than one change or our tables are not
2493 * in sync anymore -> request fresh tt data
2495 if (!orig_node
->tt_initialised
|| ttvn
!= orig_ttvn
||
2496 orig_node
->tt_crc
!= tt_crc
) {
2498 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2499 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2500 orig_node
->orig
, ttvn
, orig_ttvn
, tt_crc
,
2501 orig_node
->tt_crc
, tt_num_changes
);
2502 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
2503 tt_crc
, full_table
);
2509 /* returns true whether we know that the client has moved from its old
2510 * originator to another one. This entry is kept is still kept for consistency
2513 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
2516 struct batadv_tt_global_entry
*tt_global_entry
;
2519 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
);
2520 if (!tt_global_entry
)
2523 ret
= !!(tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
);
2524 batadv_tt_global_entry_free_ref(tt_global_entry
);
2530 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
2531 * @bat_priv: the bat priv with all the soft interface information
2532 * @addr: the MAC address of the local client to query
2534 * Returns true if the local client is known to be roaming (it is not served by
2535 * this node anymore) or not. If yes, the client is still present in the table
2536 * to keep the latter consistent with the node TTVN
2538 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
2541 struct batadv_tt_local_entry
*tt_local_entry
;
2544 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
);
2545 if (!tt_local_entry
)
2548 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
2549 batadv_tt_local_entry_free_ref(tt_local_entry
);
2555 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
2556 struct batadv_orig_node
*orig_node
,
2557 const unsigned char *addr
)
2561 /* if the originator is a backbone node (meaning it belongs to the same
2562 * LAN of this node) the temporary client must not be added because to
2563 * reach such destination the node must use the LAN instead of the mesh
2565 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
2568 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
,
2569 BATADV_TT_CLIENT_TEMP
,
2570 atomic_read(&orig_node
->last_ttvn
)))
2573 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2574 "Added temporary global client (addr: %pM orig: %pM)\n",
2575 addr
, orig_node
->orig
);