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/crc32c.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
,
38 struct batadv_orig_node
*orig_node
);
39 static void batadv_tt_purge(struct work_struct
*work
);
41 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
);
42 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
43 struct batadv_orig_node
*orig_node
,
44 const unsigned char *addr
,
45 unsigned short vid
, const char *message
,
48 /* returns 1 if they are the same mac addr */
49 static int batadv_compare_tt(const struct hlist_node
*node
, const void *data2
)
51 const void *data1
= container_of(node
, struct batadv_tt_common_entry
,
54 return (memcmp(data1
, data2
, ETH_ALEN
) == 0 ? 1 : 0);
58 * batadv_choose_tt - return the index of the tt entry in the hash table
59 * @data: pointer to the tt_common_entry object to map
60 * @size: the size of the hash table
62 * Returns the hash index where the object represented by 'data' should be
65 static inline uint32_t batadv_choose_tt(const void *data
, uint32_t size
)
67 struct batadv_tt_common_entry
*tt
;
70 tt
= (struct batadv_tt_common_entry
*)data
;
71 hash
= batadv_hash_bytes(hash
, &tt
->addr
, ETH_ALEN
);
72 hash
= batadv_hash_bytes(hash
, &tt
->vid
, sizeof(tt
->vid
));
82 * batadv_tt_hash_find - look for a client in the given hash table
83 * @hash: the hash table to search
84 * @addr: the mac address of the client to look for
85 * @vid: VLAN identifier
87 * Returns a pointer to the tt_common struct belonging to the searched client if
88 * found, NULL otherwise.
90 static struct batadv_tt_common_entry
*
91 batadv_tt_hash_find(struct batadv_hashtable
*hash
, const uint8_t *addr
,
94 struct hlist_head
*head
;
95 struct batadv_tt_common_entry to_search
, *tt
, *tt_tmp
= NULL
;
101 memcpy(to_search
.addr
, addr
, ETH_ALEN
);
104 index
= batadv_choose_tt(&to_search
, hash
->size
);
105 head
= &hash
->table
[index
];
108 hlist_for_each_entry_rcu(tt
, head
, hash_entry
) {
109 if (!batadv_compare_eth(tt
, addr
))
115 if (!atomic_inc_not_zero(&tt
->refcount
))
127 * batadv_tt_local_hash_find - search the local table for a given client
128 * @bat_priv: the bat priv with all the soft interface information
129 * @addr: the mac address of the client to look for
130 * @vid: VLAN identifier
132 * Returns a pointer to the corresponding tt_local_entry struct if the client is
133 * found, NULL otherwise.
135 static struct batadv_tt_local_entry
*
136 batadv_tt_local_hash_find(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
139 struct batadv_tt_common_entry
*tt_common_entry
;
140 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
142 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.local_hash
, addr
,
145 tt_local_entry
= container_of(tt_common_entry
,
146 struct batadv_tt_local_entry
,
148 return tt_local_entry
;
152 * batadv_tt_global_hash_find - search the global table for a given client
153 * @bat_priv: the bat priv with all the soft interface information
154 * @addr: the mac address of the client to look for
155 * @vid: VLAN identifier
157 * Returns a pointer to the corresponding tt_global_entry struct if the client
158 * is found, NULL otherwise.
160 static struct batadv_tt_global_entry
*
161 batadv_tt_global_hash_find(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
164 struct batadv_tt_common_entry
*tt_common_entry
;
165 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
167 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.global_hash
, addr
,
170 tt_global_entry
= container_of(tt_common_entry
,
171 struct batadv_tt_global_entry
,
173 return tt_global_entry
;
177 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry
*tt_local_entry
)
179 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
180 kfree_rcu(tt_local_entry
, common
.rcu
);
184 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
185 * tt_global_entry and possibly free it
186 * @tt_global_entry: the object to free
189 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry
*tt_global_entry
)
191 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
192 batadv_tt_global_del_orig_list(tt_global_entry
);
193 kfree_rcu(tt_global_entry
, common
.rcu
);
197 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
199 struct batadv_tt_orig_list_entry
*orig_entry
;
201 orig_entry
= container_of(rcu
, struct batadv_tt_orig_list_entry
, rcu
);
203 /* We are in an rcu callback here, therefore we cannot use
204 * batadv_orig_node_free_ref() and its call_rcu():
205 * An rcu_barrier() wouldn't wait for that to finish
207 batadv_orig_node_free_ref_now(orig_entry
->orig_node
);
212 * batadv_tt_local_size_mod - change the size by v of the local table identified
214 * @bat_priv: the bat priv with all the soft interface information
215 * @vid: the VLAN identifier of the sub-table to change
216 * @v: the amount to sum to the local table size
218 static void batadv_tt_local_size_mod(struct batadv_priv
*bat_priv
,
219 unsigned short vid
, int v
)
221 struct batadv_softif_vlan
*vlan
;
223 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
227 atomic_add(v
, &vlan
->tt
.num_entries
);
229 batadv_softif_vlan_free_ref(vlan
);
233 * batadv_tt_local_size_inc - increase by one the local table size for the given
235 * @bat_priv: the bat priv with all the soft interface information
236 * @vid: the VLAN identifier
238 static void batadv_tt_local_size_inc(struct batadv_priv
*bat_priv
,
241 batadv_tt_local_size_mod(bat_priv
, vid
, 1);
245 * batadv_tt_local_size_dec - decrease by one the local table size for the given
247 * @bat_priv: the bat priv with all the soft interface information
248 * @vid: the VLAN identifier
250 static void batadv_tt_local_size_dec(struct batadv_priv
*bat_priv
,
253 batadv_tt_local_size_mod(bat_priv
, vid
, -1);
257 * batadv_tt_global_size_mod - change the size by v of the local table
259 * @bat_priv: the bat priv with all the soft interface information
260 * @vid: the VLAN identifier
261 * @v: the amount to sum to the global table size
263 static void batadv_tt_global_size_mod(struct batadv_orig_node
*orig_node
,
264 unsigned short vid
, int v
)
266 struct batadv_orig_node_vlan
*vlan
;
268 vlan
= batadv_orig_node_vlan_new(orig_node
, vid
);
272 if (atomic_add_return(v
, &vlan
->tt
.num_entries
) == 0) {
273 spin_lock_bh(&orig_node
->vlan_list_lock
);
274 list_del_rcu(&vlan
->list
);
275 spin_unlock_bh(&orig_node
->vlan_list_lock
);
276 batadv_orig_node_vlan_free_ref(vlan
);
279 batadv_orig_node_vlan_free_ref(vlan
);
283 * batadv_tt_global_size_inc - increase by one the global table size for the
285 * @orig_node: the originator which global table size has to be decreased
286 * @vid: the vlan identifier
288 static void batadv_tt_global_size_inc(struct batadv_orig_node
*orig_node
,
291 batadv_tt_global_size_mod(orig_node
, vid
, 1);
295 * batadv_tt_global_size_dec - decrease by one the global table size for the
297 * @orig_node: the originator which global table size has to be decreased
298 * @vid: the vlan identifier
300 static void batadv_tt_global_size_dec(struct batadv_orig_node
*orig_node
,
303 batadv_tt_global_size_mod(orig_node
, vid
, -1);
307 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry
*orig_entry
)
309 if (!atomic_dec_and_test(&orig_entry
->refcount
))
312 call_rcu(&orig_entry
->rcu
, batadv_tt_orig_list_entry_free_rcu
);
316 * batadv_tt_local_event - store a local TT event (ADD/DEL)
317 * @bat_priv: the bat priv with all the soft interface information
318 * @tt_local_entry: the TT entry involved in the event
319 * @event_flags: flags to store in the event structure
321 static void batadv_tt_local_event(struct batadv_priv
*bat_priv
,
322 struct batadv_tt_local_entry
*tt_local_entry
,
325 struct batadv_tt_change_node
*tt_change_node
, *entry
, *safe
;
326 struct batadv_tt_common_entry
*common
= &tt_local_entry
->common
;
327 uint8_t flags
= common
->flags
| event_flags
;
328 bool event_removed
= false;
329 bool del_op_requested
, del_op_entry
;
331 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
335 tt_change_node
->change
.flags
= flags
;
336 tt_change_node
->change
.reserved
= 0;
337 memcpy(tt_change_node
->change
.addr
, common
->addr
, ETH_ALEN
);
338 tt_change_node
->change
.vid
= htons(common
->vid
);
340 del_op_requested
= flags
& BATADV_TT_CLIENT_DEL
;
342 /* check for ADD+DEL or DEL+ADD events */
343 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
344 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
346 if (!batadv_compare_eth(entry
->change
.addr
, common
->addr
))
349 /* DEL+ADD in the same orig interval have no effect and can be
350 * removed to avoid silly behaviour on the receiver side. The
351 * other way around (ADD+DEL) can happen in case of roaming of
352 * a client still in the NEW state. Roaming of NEW clients is
353 * now possible due to automatically recognition of "temporary"
356 del_op_entry
= entry
->change
.flags
& BATADV_TT_CLIENT_DEL
;
357 if (!del_op_requested
&& del_op_entry
)
359 if (del_op_requested
&& !del_op_entry
)
363 list_del(&entry
->list
);
365 kfree(tt_change_node
);
366 event_removed
= true;
370 /* track the change in the OGMinterval list */
371 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
374 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
377 atomic_dec(&bat_priv
->tt
.local_changes
);
379 atomic_inc(&bat_priv
->tt
.local_changes
);
383 * batadv_tt_len - compute length in bytes of given number of tt changes
384 * @changes_num: number of tt changes
386 * Returns computed length in bytes.
388 static int batadv_tt_len(int changes_num
)
390 return changes_num
* sizeof(struct batadv_tvlv_tt_change
);
394 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
395 * @tt_len: available space
397 * Returns the number of entries.
399 static uint16_t batadv_tt_entries(uint16_t tt_len
)
401 return tt_len
/ batadv_tt_len(1);
404 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
406 if (bat_priv
->tt
.local_hash
)
409 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
411 if (!bat_priv
->tt
.local_hash
)
414 batadv_hash_set_lock_class(bat_priv
->tt
.local_hash
,
415 &batadv_tt_local_hash_lock_class_key
);
420 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
421 struct batadv_tt_global_entry
*tt_global
,
424 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
425 "Deleting global tt entry %pM (vid: %d): %s\n",
426 tt_global
->common
.addr
,
427 BATADV_PRINT_VID(tt_global
->common
.vid
), message
);
429 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
430 batadv_choose_tt
, &tt_global
->common
);
431 batadv_tt_global_entry_free_ref(tt_global
);
435 * batadv_tt_local_add - add a new client to the local table or update an
437 * @soft_iface: netdev struct of the mesh interface
438 * @addr: the mac address of the client to add
439 * @vid: VLAN identifier
440 * @ifindex: index of the interface where the client is connected to (useful to
441 * identify wireless clients)
443 void batadv_tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
444 unsigned short vid
, int ifindex
)
446 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
447 struct batadv_tt_local_entry
*tt_local
;
448 struct batadv_tt_global_entry
*tt_global
;
449 struct hlist_head
*head
;
450 struct batadv_tt_orig_list_entry
*orig_entry
;
452 bool roamed_back
= false;
454 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
455 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
458 tt_local
->last_seen
= jiffies
;
459 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
460 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
461 "Re-adding pending client %pM (vid: %d)\n",
462 addr
, BATADV_PRINT_VID(vid
));
463 /* whatever the reason why the PENDING flag was set,
464 * this is a client which was enqueued to be removed in
465 * this orig_interval. Since it popped up again, the
466 * flag can be reset like it was never enqueued
468 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
472 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
473 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
474 "Roaming client %pM (vid: %d) came back to its original location\n",
475 addr
, BATADV_PRINT_VID(vid
));
476 /* the ROAM flag is set because this client roamed away
477 * and the node got a roaming_advertisement message. Now
478 * that the client popped up again at its original
479 * location such flag can be unset
481 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
487 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
491 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
492 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
493 addr
, BATADV_PRINT_VID(vid
),
494 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
496 memcpy(tt_local
->common
.addr
, addr
, ETH_ALEN
);
497 /* The local entry has to be marked as NEW to avoid to send it in
498 * a full table response going out before the next ttvn increment
499 * (consistency check)
501 tt_local
->common
.flags
= BATADV_TT_CLIENT_NEW
;
502 tt_local
->common
.vid
= vid
;
503 if (batadv_is_wifi_iface(ifindex
))
504 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
505 atomic_set(&tt_local
->common
.refcount
, 2);
506 tt_local
->last_seen
= jiffies
;
507 tt_local
->common
.added_at
= tt_local
->last_seen
;
509 /* the batman interface mac address should never be purged */
510 if (batadv_compare_eth(addr
, soft_iface
->dev_addr
))
511 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NOPURGE
;
513 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
514 batadv_choose_tt
, &tt_local
->common
,
515 &tt_local
->common
.hash_entry
);
517 if (unlikely(hash_added
!= 0)) {
518 /* remove the reference for the hash */
519 batadv_tt_local_entry_free_ref(tt_local
);
524 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
527 /* Check whether it is a roaming, but don't do anything if the roaming
528 * process has already been handled
530 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
531 /* These node are probably going to update their tt table */
532 head
= &tt_global
->orig_list
;
534 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
535 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
536 tt_global
->common
.vid
,
537 orig_entry
->orig_node
);
541 batadv_tt_global_free(bat_priv
, tt_global
,
545 /* The global entry has to be marked as ROAMING and
546 * has to be kept for consistency purpose
548 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
549 tt_global
->roam_at
= jiffies
;
555 batadv_tt_local_entry_free_ref(tt_local
);
557 batadv_tt_global_entry_free_ref(tt_global
);
561 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
562 * within a TT Response directed to another node
563 * @orig_node: originator for which the TT data has to be prepared
564 * @tt_data: uninitialised pointer to the address of the TVLV buffer
565 * @tt_change: uninitialised pointer to the address of the area where the TT
566 * changed can be stored
567 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
568 * function reserves the amount of space needed to send the entire global TT
569 * table. In case of success the value is updated with the real amount of
572 * Allocate the needed amount of memory for the entire TT TVLV and write its
573 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
574 * objects, one per active VLAN served by the originator node.
576 * Return the size of the allocated buffer or 0 in case of failure.
579 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node
*orig_node
,
580 struct batadv_tvlv_tt_data
**tt_data
,
581 struct batadv_tvlv_tt_change
**tt_change
,
584 uint16_t num_vlan
= 0, num_entries
= 0, change_offset
, tvlv_len
;
585 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
586 struct batadv_orig_node_vlan
*vlan
;
587 uint8_t *tt_change_ptr
;
590 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
592 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
595 change_offset
= sizeof(**tt_data
);
596 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
598 /* if tt_len is negative, allocate the space needed by the full table */
600 *tt_len
= batadv_tt_len(num_entries
);
603 tvlv_len
+= change_offset
;
605 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
611 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
612 (*tt_data
)->ttvn
= atomic_read(&orig_node
->last_ttvn
);
613 (*tt_data
)->num_vlan
= htons(num_vlan
);
615 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
616 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
617 tt_vlan
->vid
= htons(vlan
->vid
);
618 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
623 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
624 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
632 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
634 * @bat_priv: the bat priv with all the soft interface information
635 * @tt_data: uninitialised pointer to the address of the TVLV buffer
636 * @tt_change: uninitialised pointer to the address of the area where the TT
637 * changes can be stored
638 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
639 * function reserves the amount of space needed to send the entire local TT
640 * table. In case of success the value is updated with the real amount of
643 * Allocate the needed amount of memory for the entire TT TVLV and write its
644 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
645 * objects, one per active VLAN.
647 * Return the size of the allocated buffer or 0 in case of failure.
650 batadv_tt_prepare_tvlv_local_data(struct batadv_priv
*bat_priv
,
651 struct batadv_tvlv_tt_data
**tt_data
,
652 struct batadv_tvlv_tt_change
**tt_change
,
655 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
656 struct batadv_softif_vlan
*vlan
;
657 uint16_t num_vlan
= 0, num_entries
= 0, tvlv_len
;
658 uint8_t *tt_change_ptr
;
662 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
664 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
667 change_offset
= sizeof(**tt_data
);
668 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
670 /* if tt_len is negative, allocate the space needed by the full table */
672 *tt_len
= batadv_tt_len(num_entries
);
675 tvlv_len
+= change_offset
;
677 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
683 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
684 (*tt_data
)->ttvn
= atomic_read(&bat_priv
->tt
.vn
);
685 (*tt_data
)->num_vlan
= htons(num_vlan
);
687 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
688 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
689 tt_vlan
->vid
= htons(vlan
->vid
);
690 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
695 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
696 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
704 * batadv_tt_tvlv_container_update - update the translation table tvlv container
705 * after local tt changes have been committed
706 * @bat_priv: the bat priv with all the soft interface information
708 static void batadv_tt_tvlv_container_update(struct batadv_priv
*bat_priv
)
710 struct batadv_tt_change_node
*entry
, *safe
;
711 struct batadv_tvlv_tt_data
*tt_data
;
712 struct batadv_tvlv_tt_change
*tt_change
;
713 int tt_diff_len
, tt_change_len
= 0;
714 int tt_diff_entries_num
= 0, tt_diff_entries_count
= 0;
717 tt_diff_entries_num
= atomic_read(&bat_priv
->tt
.local_changes
);
718 tt_diff_len
= batadv_tt_len(tt_diff_entries_num
);
720 /* if we have too many changes for one packet don't send any
721 * and wait for the tt table request which will be fragmented
723 if (tt_diff_len
> bat_priv
->soft_iface
->mtu
)
726 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
, &tt_data
,
727 &tt_change
, &tt_diff_len
);
731 tt_data
->flags
= BATADV_TT_OGM_DIFF
;
733 if (tt_diff_len
== 0)
734 goto container_register
;
736 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
737 atomic_set(&bat_priv
->tt
.local_changes
, 0);
739 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
741 if (tt_diff_entries_count
< tt_diff_entries_num
) {
742 memcpy(tt_change
+ tt_diff_entries_count
,
744 sizeof(struct batadv_tvlv_tt_change
));
745 tt_diff_entries_count
++;
747 list_del(&entry
->list
);
750 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
752 /* Keep the buffer for possible tt_request */
753 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
754 kfree(bat_priv
->tt
.last_changeset
);
755 bat_priv
->tt
.last_changeset_len
= 0;
756 bat_priv
->tt
.last_changeset
= NULL
;
757 tt_change_len
= batadv_tt_len(tt_diff_entries_count
);
758 /* check whether this new OGM has no changes due to size problems */
759 if (tt_diff_entries_count
> 0) {
760 /* if kmalloc() fails we will reply with the full table
761 * instead of providing the diff
763 bat_priv
->tt
.last_changeset
= kzalloc(tt_diff_len
, GFP_ATOMIC
);
764 if (bat_priv
->tt
.last_changeset
) {
765 memcpy(bat_priv
->tt
.last_changeset
,
766 tt_change
, tt_change_len
);
767 bat_priv
->tt
.last_changeset_len
= tt_diff_len
;
770 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
773 batadv_tvlv_container_register(bat_priv
, BATADV_TVLV_TT
, 1, tt_data
,
778 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
780 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
781 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
782 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
783 struct batadv_tt_common_entry
*tt_common_entry
;
784 struct batadv_tt_local_entry
*tt_local
;
785 struct batadv_hard_iface
*primary_if
;
786 struct batadv_softif_vlan
*vlan
;
787 struct hlist_head
*head
;
792 unsigned long last_seen_jiffies
;
794 uint16_t np_flag
= BATADV_TT_CLIENT_NOPURGE
;
796 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
801 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
802 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
803 seq_printf(seq
, " %-13s %s %-7s %-9s (%-10s)\n", "Client", "VID",
804 "Flags", "Last seen", "CRC");
806 for (i
= 0; i
< hash
->size
; i
++) {
807 head
= &hash
->table
[i
];
810 hlist_for_each_entry_rcu(tt_common_entry
,
812 tt_local
= container_of(tt_common_entry
,
813 struct batadv_tt_local_entry
,
815 vid
= tt_common_entry
->vid
;
816 last_seen_jiffies
= jiffies
- tt_local
->last_seen
;
817 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
818 last_seen_secs
= last_seen_msecs
/ 1000;
819 last_seen_msecs
= last_seen_msecs
% 1000;
821 no_purge
= tt_common_entry
->flags
& np_flag
;
823 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
825 seq_printf(seq
, "Cannot retrieve VLAN %d\n",
826 BATADV_PRINT_VID(vid
));
831 " * %pM %4i [%c%c%c%c%c] %3u.%03u (%#.8x)\n",
832 tt_common_entry
->addr
,
833 BATADV_PRINT_VID(tt_common_entry
->vid
),
834 (tt_common_entry
->flags
&
835 BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
836 no_purge
? 'P' : '.',
837 (tt_common_entry
->flags
&
838 BATADV_TT_CLIENT_NEW
? 'N' : '.'),
839 (tt_common_entry
->flags
&
840 BATADV_TT_CLIENT_PENDING
? 'X' : '.'),
841 (tt_common_entry
->flags
&
842 BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
843 no_purge
? 0 : last_seen_secs
,
844 no_purge
? 0 : last_seen_msecs
,
847 batadv_softif_vlan_free_ref(vlan
);
853 batadv_hardif_free_ref(primary_if
);
858 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
859 struct batadv_tt_local_entry
*tt_local_entry
,
860 uint16_t flags
, const char *message
)
862 batadv_tt_local_event(bat_priv
, tt_local_entry
, flags
);
864 /* The local client has to be marked as "pending to be removed" but has
865 * to be kept in the table in order to send it in a full table
866 * response issued before the net ttvn increment (consistency check)
868 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
870 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
871 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
872 tt_local_entry
->common
.addr
,
873 BATADV_PRINT_VID(tt_local_entry
->common
.vid
), message
);
877 * batadv_tt_local_remove - logically remove an entry from the local table
878 * @bat_priv: the bat priv with all the soft interface information
879 * @addr: the MAC address of the client to remove
880 * @vid: VLAN identifier
881 * @message: message to append to the log on deletion
882 * @roaming: true if the deletion is due to a roaming event
884 * Returns the flags assigned to the local entry before being deleted
886 uint16_t batadv_tt_local_remove(struct batadv_priv
*bat_priv
,
887 const uint8_t *addr
, unsigned short vid
,
888 const char *message
, bool roaming
)
890 struct batadv_tt_local_entry
*tt_local_entry
;
891 uint16_t flags
, curr_flags
= BATADV_NO_FLAGS
;
893 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
897 curr_flags
= tt_local_entry
->common
.flags
;
899 flags
= BATADV_TT_CLIENT_DEL
;
900 /* if this global entry addition is due to a roaming, the node has to
901 * mark the local entry as "roamed" in order to correctly reroute
905 flags
|= BATADV_TT_CLIENT_ROAM
;
906 /* mark the local client as ROAMed */
907 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
910 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
911 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
915 /* if this client has been added right now, it is possible to
916 * immediately purge it
918 batadv_tt_local_event(bat_priv
, tt_local_entry
, BATADV_TT_CLIENT_DEL
);
919 hlist_del_rcu(&tt_local_entry
->common
.hash_entry
);
920 batadv_tt_local_entry_free_ref(tt_local_entry
);
924 batadv_tt_local_entry_free_ref(tt_local_entry
);
929 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
930 struct hlist_head
*head
)
932 struct batadv_tt_local_entry
*tt_local_entry
;
933 struct batadv_tt_common_entry
*tt_common_entry
;
934 struct hlist_node
*node_tmp
;
936 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
, head
,
938 tt_local_entry
= container_of(tt_common_entry
,
939 struct batadv_tt_local_entry
,
941 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
944 /* entry already marked for deletion */
945 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
948 if (!batadv_has_timed_out(tt_local_entry
->last_seen
,
949 BATADV_TT_LOCAL_TIMEOUT
))
952 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
953 BATADV_TT_CLIENT_DEL
, "timed out");
957 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
)
959 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
960 struct hlist_head
*head
;
961 spinlock_t
*list_lock
; /* protects write access to the hash lists */
964 for (i
= 0; i
< hash
->size
; i
++) {
965 head
= &hash
->table
[i
];
966 list_lock
= &hash
->list_locks
[i
];
968 spin_lock_bh(list_lock
);
969 batadv_tt_local_purge_list(bat_priv
, head
);
970 spin_unlock_bh(list_lock
);
974 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
976 struct batadv_hashtable
*hash
;
977 spinlock_t
*list_lock
; /* protects write access to the hash lists */
978 struct batadv_tt_common_entry
*tt_common_entry
;
979 struct batadv_tt_local_entry
*tt_local
;
980 struct hlist_node
*node_tmp
;
981 struct hlist_head
*head
;
984 if (!bat_priv
->tt
.local_hash
)
987 hash
= bat_priv
->tt
.local_hash
;
989 for (i
= 0; i
< hash
->size
; i
++) {
990 head
= &hash
->table
[i
];
991 list_lock
= &hash
->list_locks
[i
];
993 spin_lock_bh(list_lock
);
994 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
996 hlist_del_rcu(&tt_common_entry
->hash_entry
);
997 tt_local
= container_of(tt_common_entry
,
998 struct batadv_tt_local_entry
,
1000 batadv_tt_local_entry_free_ref(tt_local
);
1002 spin_unlock_bh(list_lock
);
1005 batadv_hash_destroy(hash
);
1007 bat_priv
->tt
.local_hash
= NULL
;
1010 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
1012 if (bat_priv
->tt
.global_hash
)
1015 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
1017 if (!bat_priv
->tt
.global_hash
)
1020 batadv_hash_set_lock_class(bat_priv
->tt
.global_hash
,
1021 &batadv_tt_global_hash_lock_class_key
);
1026 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
1028 struct batadv_tt_change_node
*entry
, *safe
;
1030 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
1032 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
1034 list_del(&entry
->list
);
1038 atomic_set(&bat_priv
->tt
.local_changes
, 0);
1039 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
1042 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1043 * batadv_tt_global_entry list
1045 * returns it with an increased refcounter, NULL if not found
1047 static struct batadv_tt_orig_list_entry
*
1048 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
1049 const struct batadv_orig_node
*orig_node
)
1051 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
1052 const struct hlist_head
*head
;
1055 head
= &entry
->orig_list
;
1056 hlist_for_each_entry_rcu(tmp_orig_entry
, head
, list
) {
1057 if (tmp_orig_entry
->orig_node
!= orig_node
)
1059 if (!atomic_inc_not_zero(&tmp_orig_entry
->refcount
))
1062 orig_entry
= tmp_orig_entry
;
1070 /* find out if an orig_node is already in the list of a tt_global_entry.
1071 * returns true if found, false otherwise
1074 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
1075 const struct batadv_orig_node
*orig_node
)
1077 struct batadv_tt_orig_list_entry
*orig_entry
;
1080 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
1083 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1090 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
1091 struct batadv_orig_node
*orig_node
, int ttvn
)
1093 struct batadv_tt_orig_list_entry
*orig_entry
;
1095 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
1097 /* refresh the ttvn: the current value could be a bogus one that
1098 * was added during a "temporary client detection"
1100 orig_entry
->ttvn
= ttvn
;
1104 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
1108 INIT_HLIST_NODE(&orig_entry
->list
);
1109 atomic_inc(&orig_node
->refcount
);
1110 batadv_tt_global_size_inc(orig_node
, tt_global
->common
.vid
);
1111 orig_entry
->orig_node
= orig_node
;
1112 orig_entry
->ttvn
= ttvn
;
1113 atomic_set(&orig_entry
->refcount
, 2);
1115 spin_lock_bh(&tt_global
->list_lock
);
1116 hlist_add_head_rcu(&orig_entry
->list
,
1117 &tt_global
->orig_list
);
1118 spin_unlock_bh(&tt_global
->list_lock
);
1121 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1125 * batadv_tt_global_add - add a new TT global entry or update an existing one
1126 * @bat_priv: the bat priv with all the soft interface information
1127 * @orig_node: the originator announcing the client
1128 * @tt_addr: the mac address of the non-mesh client
1129 * @vid: VLAN identifier
1130 * @flags: TT flags that have to be set for this non-mesh client
1131 * @ttvn: the tt version number ever announcing this non-mesh client
1133 * Add a new TT global entry for the given originator. If the entry already
1134 * exists add a new reference to the given originator (a global entry can have
1135 * references to multiple originators) and adjust the flags attribute to reflect
1136 * the function argument.
1137 * If a TT local entry exists for this non-mesh client remove it.
1139 * The caller must hold orig_node refcount.
1141 * Return true if the new entry has been added, false otherwise
1143 static bool batadv_tt_global_add(struct batadv_priv
*bat_priv
,
1144 struct batadv_orig_node
*orig_node
,
1145 const unsigned char *tt_addr
,
1146 unsigned short vid
, uint16_t flags
,
1149 struct batadv_tt_global_entry
*tt_global_entry
;
1150 struct batadv_tt_local_entry
*tt_local_entry
;
1153 struct batadv_tt_common_entry
*common
;
1154 uint16_t local_flags
;
1156 /* ignore global entries from backbone nodes */
1157 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
, vid
))
1160 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
, vid
);
1161 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
, vid
);
1163 /* if the node already has a local client for this entry, it has to wait
1164 * for a roaming advertisement instead of manually messing up the global
1167 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
1168 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
1171 if (!tt_global_entry
) {
1172 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
1173 if (!tt_global_entry
)
1176 common
= &tt_global_entry
->common
;
1177 memcpy(common
->addr
, tt_addr
, ETH_ALEN
);
1180 common
->flags
= flags
;
1181 tt_global_entry
->roam_at
= 0;
1182 /* node must store current time in case of roaming. This is
1183 * needed to purge this entry out on timeout (if nobody claims
1186 if (flags
& BATADV_TT_CLIENT_ROAM
)
1187 tt_global_entry
->roam_at
= jiffies
;
1188 atomic_set(&common
->refcount
, 2);
1189 common
->added_at
= jiffies
;
1191 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
1192 spin_lock_init(&tt_global_entry
->list_lock
);
1194 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
1196 batadv_choose_tt
, common
,
1197 &common
->hash_entry
);
1199 if (unlikely(hash_added
!= 0)) {
1200 /* remove the reference for the hash */
1201 batadv_tt_global_entry_free_ref(tt_global_entry
);
1205 common
= &tt_global_entry
->common
;
1206 /* If there is already a global entry, we can use this one for
1208 * But if we are trying to add a temporary client then here are
1209 * two options at this point:
1210 * 1) the global client is not a temporary client: the global
1211 * client has to be left as it is, temporary information
1212 * should never override any already known client state
1213 * 2) the global client is a temporary client: purge the
1214 * originator list and add the new one orig_entry
1216 if (flags
& BATADV_TT_CLIENT_TEMP
) {
1217 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
1219 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
1222 batadv_tt_global_del_orig_list(tt_global_entry
);
1223 goto add_orig_entry
;
1226 /* if the client was temporary added before receiving the first
1227 * OGM announcing it, we have to clear the TEMP flag
1229 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
1231 /* the change can carry possible "attribute" flags like the
1232 * TT_CLIENT_WIFI, therefore they have to be copied in the
1235 tt_global_entry
->common
.flags
|= flags
;
1237 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1238 * one originator left in the list and we previously received a
1239 * delete + roaming change for this originator.
1241 * We should first delete the old originator before adding the
1244 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
1245 batadv_tt_global_del_orig_list(tt_global_entry
);
1246 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
1247 tt_global_entry
->roam_at
= 0;
1251 /* add the new orig_entry (if needed) or update it */
1252 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
1254 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1255 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1256 common
->addr
, BATADV_PRINT_VID(common
->vid
),
1262 /* remove address from local hash if present */
1263 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
, vid
,
1264 "global tt received",
1265 flags
& BATADV_TT_CLIENT_ROAM
);
1266 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
1268 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
1269 /* this is a normal global add. Therefore the client is not in a
1270 * roaming state anymore.
1272 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
1275 if (tt_global_entry
)
1276 batadv_tt_global_entry_free_ref(tt_global_entry
);
1278 batadv_tt_local_entry_free_ref(tt_local_entry
);
1282 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
1283 * @bat_priv: the bat priv with all the soft interface information
1284 * @tt_global_entry: global translation table entry to be analyzed
1286 * This functon assumes the caller holds rcu_read_lock().
1287 * Returns best originator list entry or NULL on errors.
1289 static struct batadv_tt_orig_list_entry
*
1290 batadv_transtable_best_orig(struct batadv_priv
*bat_priv
,
1291 struct batadv_tt_global_entry
*tt_global_entry
)
1293 struct batadv_neigh_node
*router
, *best_router
= NULL
;
1294 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
1295 struct hlist_head
*head
;
1296 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
1298 head
= &tt_global_entry
->orig_list
;
1299 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1300 router
= batadv_orig_node_get_router(orig_entry
->orig_node
);
1305 bao
->bat_neigh_cmp(router
, best_router
) <= 0) {
1306 batadv_neigh_node_free_ref(router
);
1310 /* release the refcount for the "old" best */
1312 batadv_neigh_node_free_ref(best_router
);
1314 best_entry
= orig_entry
;
1315 best_router
= router
;
1319 batadv_neigh_node_free_ref(best_router
);
1324 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1325 * for this global entry
1326 * @bat_priv: the bat priv with all the soft interface information
1327 * @tt_global_entry: global translation table entry to be printed
1328 * @seq: debugfs table seq_file struct
1330 * This functon assumes the caller holds rcu_read_lock().
1333 batadv_tt_global_print_entry(struct batadv_priv
*bat_priv
,
1334 struct batadv_tt_global_entry
*tt_global_entry
,
1335 struct seq_file
*seq
)
1337 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
1338 struct batadv_tt_common_entry
*tt_common_entry
;
1339 struct batadv_orig_node_vlan
*vlan
;
1340 struct hlist_head
*head
;
1344 tt_common_entry
= &tt_global_entry
->common
;
1345 flags
= tt_common_entry
->flags
;
1347 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1349 vlan
= batadv_orig_node_vlan_get(best_entry
->orig_node
,
1350 tt_common_entry
->vid
);
1353 " * Cannot retrieve VLAN %d for originator %pM\n",
1354 BATADV_PRINT_VID(tt_common_entry
->vid
),
1355 best_entry
->orig_node
->orig
);
1359 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
1361 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n",
1362 '*', tt_global_entry
->common
.addr
,
1363 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1364 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
1365 last_ttvn
, vlan
->tt
.crc
,
1366 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1367 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1368 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1370 batadv_orig_node_vlan_free_ref(vlan
);
1374 head
= &tt_global_entry
->orig_list
;
1376 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1377 if (best_entry
== orig_entry
)
1380 vlan
= batadv_orig_node_vlan_get(orig_entry
->orig_node
,
1381 tt_common_entry
->vid
);
1384 " + Cannot retrieve VLAN %d for originator %pM\n",
1385 BATADV_PRINT_VID(tt_common_entry
->vid
),
1386 orig_entry
->orig_node
->orig
);
1390 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
1392 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n",
1393 '+', tt_global_entry
->common
.addr
,
1394 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1395 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1396 last_ttvn
, vlan
->tt
.crc
,
1397 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1398 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1399 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1401 batadv_orig_node_vlan_free_ref(vlan
);
1405 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1407 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1408 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1409 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1410 struct batadv_tt_common_entry
*tt_common_entry
;
1411 struct batadv_tt_global_entry
*tt_global
;
1412 struct batadv_hard_iface
*primary_if
;
1413 struct hlist_head
*head
;
1416 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1421 "Globally announced TT entries received via the mesh %s\n",
1423 seq_printf(seq
, " %-13s %s %s %-15s %s (%-10s) %s\n",
1424 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1427 for (i
= 0; i
< hash
->size
; i
++) {
1428 head
= &hash
->table
[i
];
1431 hlist_for_each_entry_rcu(tt_common_entry
,
1433 tt_global
= container_of(tt_common_entry
,
1434 struct batadv_tt_global_entry
,
1436 batadv_tt_global_print_entry(bat_priv
, tt_global
, seq
);
1442 batadv_hardif_free_ref(primary_if
);
1446 /* deletes the orig list of a tt_global_entry */
1448 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1450 struct hlist_head
*head
;
1451 struct hlist_node
*safe
;
1452 struct batadv_tt_orig_list_entry
*orig_entry
;
1454 spin_lock_bh(&tt_global_entry
->list_lock
);
1455 head
= &tt_global_entry
->orig_list
;
1456 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1457 hlist_del_rcu(&orig_entry
->list
);
1458 batadv_tt_global_size_dec(orig_entry
->orig_node
,
1459 tt_global_entry
->common
.vid
);
1460 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1462 spin_unlock_bh(&tt_global_entry
->list_lock
);
1466 batadv_tt_global_del_orig_entry(struct batadv_priv
*bat_priv
,
1467 struct batadv_tt_global_entry
*tt_global_entry
,
1468 struct batadv_orig_node
*orig_node
,
1469 const char *message
)
1471 struct hlist_head
*head
;
1472 struct hlist_node
*safe
;
1473 struct batadv_tt_orig_list_entry
*orig_entry
;
1476 spin_lock_bh(&tt_global_entry
->list_lock
);
1477 head
= &tt_global_entry
->orig_list
;
1478 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1479 if (orig_entry
->orig_node
== orig_node
) {
1480 vid
= tt_global_entry
->common
.vid
;
1481 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1482 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1484 tt_global_entry
->common
.addr
,
1485 BATADV_PRINT_VID(vid
), message
);
1486 hlist_del_rcu(&orig_entry
->list
);
1487 batadv_tt_global_size_dec(orig_node
,
1488 tt_global_entry
->common
.vid
);
1489 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1492 spin_unlock_bh(&tt_global_entry
->list_lock
);
1495 /* If the client is to be deleted, we check if it is the last origantor entry
1496 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1497 * timer, otherwise we simply remove the originator scheduled for deletion.
1500 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1501 struct batadv_tt_global_entry
*tt_global_entry
,
1502 struct batadv_orig_node
*orig_node
,
1503 const char *message
)
1505 bool last_entry
= true;
1506 struct hlist_head
*head
;
1507 struct batadv_tt_orig_list_entry
*orig_entry
;
1509 /* no local entry exists, case 1:
1510 * Check if this is the last one or if other entries exist.
1514 head
= &tt_global_entry
->orig_list
;
1515 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1516 if (orig_entry
->orig_node
!= orig_node
) {
1524 /* its the last one, mark for roaming. */
1525 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1526 tt_global_entry
->roam_at
= jiffies
;
1528 /* there is another entry, we can simply delete this
1529 * one and can still use the other one.
1531 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1532 orig_node
, message
);
1536 * batadv_tt_global_del - remove a client from the global table
1537 * @bat_priv: the bat priv with all the soft interface information
1538 * @orig_node: an originator serving this client
1539 * @addr: the mac address of the client
1540 * @vid: VLAN identifier
1541 * @message: a message explaining the reason for deleting the client to print
1542 * for debugging purpose
1543 * @roaming: true if the deletion has been triggered by a roaming event
1545 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1546 struct batadv_orig_node
*orig_node
,
1547 const unsigned char *addr
, unsigned short vid
,
1548 const char *message
, bool roaming
)
1550 struct batadv_tt_global_entry
*tt_global_entry
;
1551 struct batadv_tt_local_entry
*local_entry
= NULL
;
1553 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1554 if (!tt_global_entry
)
1558 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1559 orig_node
, message
);
1561 if (hlist_empty(&tt_global_entry
->orig_list
))
1562 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1568 /* if we are deleting a global entry due to a roam
1569 * event, there are two possibilities:
1570 * 1) the client roamed from node A to node B => if there
1571 * is only one originator left for this client, we mark
1572 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1573 * wait for node B to claim it. In case of timeout
1574 * the entry is purged.
1576 * If there are other originators left, we directly delete
1578 * 2) the client roamed to us => we can directly delete
1579 * the global entry, since it is useless now.
1581 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1582 tt_global_entry
->common
.addr
,
1585 /* local entry exists, case 2: client roamed to us. */
1586 batadv_tt_global_del_orig_list(tt_global_entry
);
1587 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1589 /* no local entry exists, case 1: check for roaming */
1590 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1591 orig_node
, message
);
1595 if (tt_global_entry
)
1596 batadv_tt_global_entry_free_ref(tt_global_entry
);
1598 batadv_tt_local_entry_free_ref(local_entry
);
1602 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1603 * given originator matching the provided vid
1604 * @bat_priv: the bat priv with all the soft interface information
1605 * @orig_node: the originator owning the entries to remove
1606 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1608 * @message: debug message to print as "reason"
1610 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1611 struct batadv_orig_node
*orig_node
,
1613 const char *message
)
1615 struct batadv_tt_global_entry
*tt_global
;
1616 struct batadv_tt_common_entry
*tt_common_entry
;
1618 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1619 struct hlist_node
*safe
;
1620 struct hlist_head
*head
;
1621 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1627 for (i
= 0; i
< hash
->size
; i
++) {
1628 head
= &hash
->table
[i
];
1629 list_lock
= &hash
->list_locks
[i
];
1631 spin_lock_bh(list_lock
);
1632 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1634 /* remove only matching entries */
1635 if (match_vid
>= 0 && tt_common_entry
->vid
!= match_vid
)
1638 tt_global
= container_of(tt_common_entry
,
1639 struct batadv_tt_global_entry
,
1642 batadv_tt_global_del_orig_entry(bat_priv
, tt_global
,
1643 orig_node
, message
);
1645 if (hlist_empty(&tt_global
->orig_list
)) {
1646 vid
= tt_global
->common
.vid
;
1647 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1648 "Deleting global tt entry %pM (vid: %d): %s\n",
1649 tt_global
->common
.addr
,
1650 BATADV_PRINT_VID(vid
), message
);
1651 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1652 batadv_tt_global_entry_free_ref(tt_global
);
1655 spin_unlock_bh(list_lock
);
1657 orig_node
->tt_initialised
= false;
1660 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1664 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1665 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1667 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1668 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1670 *msg
= "Roaming timeout\n";
1673 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1674 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1676 *msg
= "Temporary client timeout\n";
1682 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1684 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1685 struct hlist_head
*head
;
1686 struct hlist_node
*node_tmp
;
1687 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1690 struct batadv_tt_common_entry
*tt_common
;
1691 struct batadv_tt_global_entry
*tt_global
;
1693 for (i
= 0; i
< hash
->size
; i
++) {
1694 head
= &hash
->table
[i
];
1695 list_lock
= &hash
->list_locks
[i
];
1697 spin_lock_bh(list_lock
);
1698 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
1700 tt_global
= container_of(tt_common
,
1701 struct batadv_tt_global_entry
,
1704 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1707 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1708 "Deleting global tt entry %pM (vid: %d): %s\n",
1709 tt_global
->common
.addr
,
1710 BATADV_PRINT_VID(tt_global
->common
.vid
),
1713 hlist_del_rcu(&tt_common
->hash_entry
);
1715 batadv_tt_global_entry_free_ref(tt_global
);
1717 spin_unlock_bh(list_lock
);
1721 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1723 struct batadv_hashtable
*hash
;
1724 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1725 struct batadv_tt_common_entry
*tt_common_entry
;
1726 struct batadv_tt_global_entry
*tt_global
;
1727 struct hlist_node
*node_tmp
;
1728 struct hlist_head
*head
;
1731 if (!bat_priv
->tt
.global_hash
)
1734 hash
= bat_priv
->tt
.global_hash
;
1736 for (i
= 0; i
< hash
->size
; i
++) {
1737 head
= &hash
->table
[i
];
1738 list_lock
= &hash
->list_locks
[i
];
1740 spin_lock_bh(list_lock
);
1741 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1743 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1744 tt_global
= container_of(tt_common_entry
,
1745 struct batadv_tt_global_entry
,
1747 batadv_tt_global_entry_free_ref(tt_global
);
1749 spin_unlock_bh(list_lock
);
1752 batadv_hash_destroy(hash
);
1754 bat_priv
->tt
.global_hash
= NULL
;
1758 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
1759 struct batadv_tt_global_entry
*tt_global_entry
)
1763 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
1764 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
1771 * batadv_transtable_search - get the mesh destination for a given client
1772 * @bat_priv: the bat priv with all the soft interface information
1773 * @src: mac address of the source client
1774 * @addr: mac address of the destination client
1775 * @vid: VLAN identifier
1777 * Returns a pointer to the originator that was selected as destination in the
1778 * mesh for contacting the client 'addr', NULL otherwise.
1779 * In case of multiple originators serving the same client, the function returns
1780 * the best one (best in terms of metric towards the destination node).
1782 * If the two clients are AP isolated the function returns NULL.
1784 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
1786 const uint8_t *addr
,
1789 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
1790 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
1791 struct batadv_orig_node
*orig_node
= NULL
;
1792 struct batadv_tt_orig_list_entry
*best_entry
;
1793 bool ap_isolation_enabled
= false;
1794 struct batadv_softif_vlan
*vlan
;
1796 /* if the AP isolation is requested on a VLAN, then check for its
1797 * setting in the proper VLAN private data structure
1799 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1801 ap_isolation_enabled
= atomic_read(&vlan
->ap_isolation
);
1802 batadv_softif_vlan_free_ref(vlan
);
1805 if (src
&& ap_isolation_enabled
) {
1806 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
, vid
);
1807 if (!tt_local_entry
||
1808 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
1812 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1813 if (!tt_global_entry
)
1816 /* check whether the clients should not communicate due to AP
1819 if (tt_local_entry
&&
1820 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
1824 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1825 /* found anything? */
1827 orig_node
= best_entry
->orig_node
;
1828 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1833 if (tt_global_entry
)
1834 batadv_tt_global_entry_free_ref(tt_global_entry
);
1836 batadv_tt_local_entry_free_ref(tt_local_entry
);
1842 * batadv_tt_global_crc - calculates the checksum of the local table belonging
1843 * to the given orig_node
1844 * @bat_priv: the bat priv with all the soft interface information
1845 * @orig_node: originator for which the CRC should be computed
1846 * @vid: VLAN identifier for which the CRC32 has to be computed
1848 * This function computes the checksum for the global table corresponding to a
1849 * specific originator. In particular, the checksum is computed as follows: For
1850 * each client connected to the originator the CRC32C of the MAC address and the
1851 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1854 * The idea behind is that CRC32C should be used as much as possible in order to
1855 * produce a unique hash of the table, but since the order which is used to feed
1856 * the CRC32C function affects the result and since every node in the network
1857 * probably sorts the clients differently, the hash function cannot be directly
1858 * computed over the entire table. Hence the CRC32C is used only on
1859 * the single client entry, while all the results are then xor'ed together
1860 * because the XOR operation can combine them all while trying to reduce the
1861 * noise as much as possible.
1863 * Returns the checksum of the global table of a given originator.
1865 static uint32_t batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
1866 struct batadv_orig_node
*orig_node
,
1869 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1870 struct batadv_tt_common_entry
*tt_common
;
1871 struct batadv_tt_global_entry
*tt_global
;
1872 struct hlist_head
*head
;
1873 uint32_t i
, crc_tmp
, crc
= 0;
1875 for (i
= 0; i
< hash
->size
; i
++) {
1876 head
= &hash
->table
[i
];
1879 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1880 tt_global
= container_of(tt_common
,
1881 struct batadv_tt_global_entry
,
1883 /* compute the CRC only for entries belonging to the
1884 * VLAN identified by the vid passed as parameter
1886 if (tt_common
->vid
!= vid
)
1889 /* Roaming clients are in the global table for
1890 * consistency only. They don't have to be
1891 * taken into account while computing the
1894 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
1896 /* Temporary clients have not been announced yet, so
1897 * they have to be skipped while computing the global
1900 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
1903 /* find out if this global entry is announced by this
1906 if (!batadv_tt_global_entry_has_orig(tt_global
,
1910 crc_tmp
= crc32c(0, &tt_common
->vid
,
1911 sizeof(tt_common
->vid
));
1912 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
1921 * batadv_tt_local_crc - calculates the checksum of the local table
1922 * @bat_priv: the bat priv with all the soft interface information
1923 * @vid: VLAN identifier for which the CRC32 has to be computed
1925 * For details about the computation, please refer to the documentation for
1926 * batadv_tt_global_crc().
1928 * Returns the checksum of the local table
1930 static uint32_t batadv_tt_local_crc(struct batadv_priv
*bat_priv
,
1933 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1934 struct batadv_tt_common_entry
*tt_common
;
1935 struct hlist_head
*head
;
1936 uint32_t i
, crc_tmp
, crc
= 0;
1938 for (i
= 0; i
< hash
->size
; i
++) {
1939 head
= &hash
->table
[i
];
1942 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1943 /* compute the CRC only for entries belonging to the
1944 * VLAN identified by vid
1946 if (tt_common
->vid
!= vid
)
1949 /* not yet committed clients have not to be taken into
1950 * account while computing the CRC
1952 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
1955 crc_tmp
= crc32c(0, &tt_common
->vid
,
1956 sizeof(tt_common
->vid
));
1957 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
1965 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
1967 struct batadv_tt_req_node
*node
, *safe
;
1969 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1971 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
1972 list_del(&node
->list
);
1976 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1979 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
1980 struct batadv_orig_node
*orig_node
,
1981 const void *tt_buff
,
1982 uint16_t tt_buff_len
)
1984 /* Replace the old buffer only if I received something in the
1985 * last OGM (the OGM could carry no changes)
1987 spin_lock_bh(&orig_node
->tt_buff_lock
);
1988 if (tt_buff_len
> 0) {
1989 kfree(orig_node
->tt_buff
);
1990 orig_node
->tt_buff_len
= 0;
1991 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
1992 if (orig_node
->tt_buff
) {
1993 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
1994 orig_node
->tt_buff_len
= tt_buff_len
;
1997 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2000 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
2002 struct batadv_tt_req_node
*node
, *safe
;
2004 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2005 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2006 if (batadv_has_timed_out(node
->issued_at
,
2007 BATADV_TT_REQUEST_TIMEOUT
)) {
2008 list_del(&node
->list
);
2012 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2015 /* returns the pointer to the new tt_req_node struct if no request
2016 * has already been issued for this orig_node, NULL otherwise
2018 static struct batadv_tt_req_node
*
2019 batadv_new_tt_req_node(struct batadv_priv
*bat_priv
,
2020 struct batadv_orig_node
*orig_node
)
2022 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
2024 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2025 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
2026 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
2027 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
2028 BATADV_TT_REQUEST_TIMEOUT
))
2032 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
2036 memcpy(tt_req_node
->addr
, orig_node
->orig
, ETH_ALEN
);
2037 tt_req_node
->issued_at
= jiffies
;
2039 list_add(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
2041 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2046 * batadv_tt_local_valid - verify that given tt entry is a valid one
2047 * @entry_ptr: to be checked local tt entry
2048 * @data_ptr: not used but definition required to satisfy the callback prototype
2050 * Returns 1 if the entry is a valid, 0 otherwise.
2052 static int batadv_tt_local_valid(const void *entry_ptr
, const void *data_ptr
)
2054 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2056 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
2061 static int batadv_tt_global_valid(const void *entry_ptr
,
2062 const void *data_ptr
)
2064 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2065 const struct batadv_tt_global_entry
*tt_global_entry
;
2066 const struct batadv_orig_node
*orig_node
= data_ptr
;
2068 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
2069 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
2072 tt_global_entry
= container_of(tt_common_entry
,
2073 struct batadv_tt_global_entry
,
2076 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
2080 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2082 * @bat_priv: the bat priv with all the soft interface information
2083 * @hash: hash table containing the tt entries
2084 * @tt_len: expected tvlv tt data buffer length in number of bytes
2085 * @tvlv_buff: pointer to the buffer to fill with the TT data
2086 * @valid_cb: function to filter tt change entries
2087 * @cb_data: data passed to the filter function as argument
2089 static void batadv_tt_tvlv_generate(struct batadv_priv
*bat_priv
,
2090 struct batadv_hashtable
*hash
,
2091 void *tvlv_buff
, uint16_t tt_len
,
2092 int (*valid_cb
)(const void *, const void *),
2095 struct batadv_tt_common_entry
*tt_common_entry
;
2096 struct batadv_tvlv_tt_change
*tt_change
;
2097 struct hlist_head
*head
;
2098 uint16_t tt_tot
, tt_num_entries
= 0;
2101 tt_tot
= batadv_tt_entries(tt_len
);
2102 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_buff
;
2105 for (i
= 0; i
< hash
->size
; i
++) {
2106 head
= &hash
->table
[i
];
2108 hlist_for_each_entry_rcu(tt_common_entry
,
2110 if (tt_tot
== tt_num_entries
)
2113 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
2116 memcpy(tt_change
->addr
, tt_common_entry
->addr
,
2118 tt_change
->flags
= tt_common_entry
->flags
;
2119 tt_change
->vid
= htons(tt_common_entry
->vid
);
2120 tt_change
->reserved
= 0;
2130 * batadv_tt_global_check_crc - check if all the CRCs are correct
2131 * @orig_node: originator for which the CRCs have to be checked
2132 * @tt_vlan: pointer to the first tvlv VLAN entry
2133 * @num_vlan: number of tvlv VLAN entries
2134 * @create: if true, create VLAN objects if not found
2136 * Return true if all the received CRCs match the locally stored ones, false
2139 static bool batadv_tt_global_check_crc(struct batadv_orig_node
*orig_node
,
2140 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2143 struct batadv_tvlv_tt_vlan_data
*tt_vlan_tmp
;
2144 struct batadv_orig_node_vlan
*vlan
;
2147 /* check if each received CRC matches the locally stored one */
2148 for (i
= 0; i
< num_vlan
; i
++) {
2149 tt_vlan_tmp
= tt_vlan
+ i
;
2151 /* if orig_node is a backbone node for this VLAN, don't check
2152 * the CRC as we ignore all the global entries over it
2154 if (batadv_bla_is_backbone_gw_orig(orig_node
->bat_priv
,
2156 ntohs(tt_vlan_tmp
->vid
)))
2159 vlan
= batadv_orig_node_vlan_get(orig_node
,
2160 ntohs(tt_vlan_tmp
->vid
));
2164 if (vlan
->tt
.crc
!= ntohl(tt_vlan_tmp
->crc
))
2172 * batadv_tt_local_update_crc - update all the local CRCs
2173 * @bat_priv: the bat priv with all the soft interface information
2175 static void batadv_tt_local_update_crc(struct batadv_priv
*bat_priv
)
2177 struct batadv_softif_vlan
*vlan
;
2179 /* recompute the global CRC for each VLAN */
2181 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
2182 vlan
->tt
.crc
= batadv_tt_local_crc(bat_priv
, vlan
->vid
);
2188 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2189 * @bat_priv: the bat priv with all the soft interface information
2190 * @orig_node: the orig_node for which the CRCs have to be updated
2192 static void batadv_tt_global_update_crc(struct batadv_priv
*bat_priv
,
2193 struct batadv_orig_node
*orig_node
)
2195 struct batadv_orig_node_vlan
*vlan
;
2198 /* recompute the global CRC for each VLAN */
2200 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
2201 /* if orig_node is a backbone node for this VLAN, don't compute
2202 * the CRC as we ignore all the global entries over it
2204 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
,
2208 crc
= batadv_tt_global_crc(bat_priv
, orig_node
, vlan
->vid
);
2215 * batadv_send_tt_request - send a TT Request message to a given node
2216 * @bat_priv: the bat priv with all the soft interface information
2217 * @dst_orig_node: the destination of the message
2218 * @ttvn: the version number that the source of the message is looking for
2219 * @tt_vlan: pointer to the first tvlv VLAN object to request
2220 * @num_vlan: number of tvlv VLAN entries
2221 * @full_table: ask for the entire translation table if true, while only for the
2222 * last TT diff otherwise
2224 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
2225 struct batadv_orig_node
*dst_orig_node
,
2227 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2228 uint16_t num_vlan
, bool full_table
)
2230 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2231 struct batadv_tt_req_node
*tt_req_node
= NULL
;
2232 struct batadv_tvlv_tt_vlan_data
*tt_vlan_req
;
2233 struct batadv_hard_iface
*primary_if
;
2237 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2241 /* The new tt_req will be issued only if I'm not waiting for a
2242 * reply from the same orig_node yet
2244 tt_req_node
= batadv_new_tt_req_node(bat_priv
, dst_orig_node
);
2248 size
= sizeof(*tvlv_tt_data
) + sizeof(*tt_vlan_req
) * num_vlan
;
2249 tvlv_tt_data
= kzalloc(size
, GFP_ATOMIC
);
2253 tvlv_tt_data
->flags
= BATADV_TT_REQUEST
;
2254 tvlv_tt_data
->ttvn
= ttvn
;
2255 tvlv_tt_data
->num_vlan
= htons(num_vlan
);
2257 /* send all the CRCs within the request. This is needed by intermediate
2258 * nodes to ensure they have the correct table before replying
2260 tt_vlan_req
= (struct batadv_tvlv_tt_vlan_data
*)(tvlv_tt_data
+ 1);
2261 for (i
= 0; i
< num_vlan
; i
++) {
2262 tt_vlan_req
->vid
= tt_vlan
->vid
;
2263 tt_vlan_req
->crc
= tt_vlan
->crc
;
2270 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2272 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
2273 dst_orig_node
->orig
, full_table
? 'F' : '.');
2275 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
2276 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2277 dst_orig_node
->orig
, BATADV_TVLV_TT
, 1,
2278 tvlv_tt_data
, size
);
2283 batadv_hardif_free_ref(primary_if
);
2284 if (ret
&& tt_req_node
) {
2285 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2286 list_del(&tt_req_node
->list
);
2287 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2290 kfree(tvlv_tt_data
);
2295 * batadv_send_other_tt_response - send reply to tt request concerning another
2296 * node's translation table
2297 * @bat_priv: the bat priv with all the soft interface information
2298 * @tt_data: tt data containing the tt request information
2299 * @req_src: mac address of tt request sender
2300 * @req_dst: mac address of tt request recipient
2302 * Returns true if tt request reply was sent, false otherwise.
2304 static bool batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
2305 struct batadv_tvlv_tt_data
*tt_data
,
2306 uint8_t *req_src
, uint8_t *req_dst
)
2308 struct batadv_orig_node
*req_dst_orig_node
;
2309 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
2310 struct batadv_tvlv_tt_change
*tt_change
;
2311 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2312 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
2313 bool ret
= false, full_table
;
2314 uint8_t orig_ttvn
, req_ttvn
;
2318 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2319 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2320 req_src
, tt_data
->ttvn
, req_dst
,
2321 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2323 /* Let's get the orig node of the REAL destination */
2324 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_dst
);
2325 if (!req_dst_orig_node
)
2328 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2329 if (!res_dst_orig_node
)
2332 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
2333 req_ttvn
= tt_data
->ttvn
;
2335 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
2336 /* this node doesn't have the requested data */
2337 if (orig_ttvn
!= req_ttvn
||
2338 !batadv_tt_global_check_crc(req_dst_orig_node
, tt_vlan
,
2339 ntohs(tt_data
->num_vlan
)))
2342 /* If the full table has been explicitly requested */
2343 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
||
2344 !req_dst_orig_node
->tt_buff
)
2349 /* TT fragmentation hasn't been implemented yet, so send as many
2350 * TT entries fit a single packet as possible only
2353 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
2354 tt_len
= req_dst_orig_node
->tt_buff_len
;
2356 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2363 /* Copy the last orig_node's OGM buffer */
2364 memcpy(tt_change
, req_dst_orig_node
->tt_buff
,
2365 req_dst_orig_node
->tt_buff_len
);
2366 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2368 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2369 * in the initial part
2372 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2379 /* fill the rest of the tvlv with the real TT entries */
2380 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.global_hash
,
2382 batadv_tt_global_valid
,
2386 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2387 tvlv_tt_data
->ttvn
= req_ttvn
;
2390 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2392 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2393 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2394 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
,
2395 full_table
? 'F' : '.', req_ttvn
);
2397 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2399 batadv_tvlv_unicast_send(bat_priv
, req_dst_orig_node
->orig
,
2400 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2407 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2410 if (res_dst_orig_node
)
2411 batadv_orig_node_free_ref(res_dst_orig_node
);
2412 if (req_dst_orig_node
)
2413 batadv_orig_node_free_ref(req_dst_orig_node
);
2414 kfree(tvlv_tt_data
);
2419 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2421 * @bat_priv: the bat priv with all the soft interface information
2422 * @tt_data: tt data containing the tt request information
2423 * @req_src: mac address of tt request sender
2425 * Returns true if tt request reply was sent, false otherwise.
2427 static bool batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
2428 struct batadv_tvlv_tt_data
*tt_data
,
2431 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2432 struct batadv_hard_iface
*primary_if
= NULL
;
2433 struct batadv_tvlv_tt_change
*tt_change
;
2434 struct batadv_orig_node
*orig_node
;
2435 uint8_t my_ttvn
, req_ttvn
;
2440 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2441 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2442 req_src
, tt_data
->ttvn
,
2443 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2445 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2447 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2448 req_ttvn
= tt_data
->ttvn
;
2450 orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2454 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2458 /* If the full table has been explicitly requested or the gap
2459 * is too big send the whole local translation table
2461 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
2462 !bat_priv
->tt
.last_changeset
)
2467 /* TT fragmentation hasn't been implemented yet, so send as many
2468 * TT entries fit a single packet as possible only
2471 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
2473 tt_len
= bat_priv
->tt
.last_changeset_len
;
2474 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2481 /* Copy the last orig_node's OGM buffer */
2482 memcpy(tt_change
, bat_priv
->tt
.last_changeset
,
2483 bat_priv
->tt
.last_changeset_len
);
2484 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2486 req_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2488 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2489 * in the initial part
2492 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2499 /* fill the rest of the tvlv with the real TT entries */
2500 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.local_hash
,
2502 batadv_tt_local_valid
, NULL
);
2505 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2506 tvlv_tt_data
->ttvn
= req_ttvn
;
2509 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2511 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2512 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2513 orig_node
->orig
, full_table
? 'F' : '.', req_ttvn
);
2515 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2517 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2518 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2524 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2526 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2528 batadv_orig_node_free_ref(orig_node
);
2530 batadv_hardif_free_ref(primary_if
);
2531 kfree(tvlv_tt_data
);
2532 /* The packet was for this host, so it doesn't need to be re-routed */
2537 * batadv_send_tt_response - send reply to tt request
2538 * @bat_priv: the bat priv with all the soft interface information
2539 * @tt_data: tt data containing the tt request information
2540 * @req_src: mac address of tt request sender
2541 * @req_dst: mac address of tt request recipient
2543 * Returns true if tt request reply was sent, false otherwise.
2545 static bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
2546 struct batadv_tvlv_tt_data
*tt_data
,
2547 uint8_t *req_src
, uint8_t *req_dst
)
2549 if (batadv_is_my_mac(bat_priv
, req_dst
))
2550 return batadv_send_my_tt_response(bat_priv
, tt_data
, req_src
);
2552 return batadv_send_other_tt_response(bat_priv
, tt_data
,
2556 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2557 struct batadv_orig_node
*orig_node
,
2558 struct batadv_tvlv_tt_change
*tt_change
,
2559 uint16_t tt_num_changes
, uint8_t ttvn
)
2564 for (i
= 0; i
< tt_num_changes
; i
++) {
2565 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
2566 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
2567 batadv_tt_global_del(bat_priv
, orig_node
,
2568 (tt_change
+ i
)->addr
,
2569 ntohs((tt_change
+ i
)->vid
),
2570 "tt removed by changes",
2573 if (!batadv_tt_global_add(bat_priv
, orig_node
,
2574 (tt_change
+ i
)->addr
,
2575 ntohs((tt_change
+ i
)->vid
),
2576 (tt_change
+ i
)->flags
, ttvn
))
2577 /* In case of problem while storing a
2578 * global_entry, we stop the updating
2579 * procedure without committing the
2580 * ttvn change. This will avoid to send
2581 * corrupted data on tt_request
2586 orig_node
->tt_initialised
= true;
2589 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
2590 struct batadv_tvlv_tt_change
*tt_change
,
2591 uint8_t ttvn
, uint8_t *resp_src
,
2592 uint16_t num_entries
)
2594 struct batadv_orig_node
*orig_node
;
2596 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2600 /* Purge the old table first.. */
2601 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
2602 "Received full table");
2604 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
, num_entries
,
2607 spin_lock_bh(&orig_node
->tt_buff_lock
);
2608 kfree(orig_node
->tt_buff
);
2609 orig_node
->tt_buff_len
= 0;
2610 orig_node
->tt_buff
= NULL
;
2611 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2613 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2617 batadv_orig_node_free_ref(orig_node
);
2620 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2621 struct batadv_orig_node
*orig_node
,
2622 uint16_t tt_num_changes
, uint8_t ttvn
,
2623 struct batadv_tvlv_tt_change
*tt_change
)
2625 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2626 tt_num_changes
, ttvn
);
2628 batadv_tt_save_orig_buffer(bat_priv
, orig_node
, tt_change
,
2629 batadv_tt_len(tt_num_changes
));
2630 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2634 * batadv_is_my_client - check if a client is served by the local node
2635 * @bat_priv: the bat priv with all the soft interface information
2636 * @addr: the mac adress of the client to check
2637 * @vid: VLAN identifier
2639 * Returns true if the client is served by this node, false otherwise.
2641 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
2644 struct batadv_tt_local_entry
*tt_local_entry
;
2647 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
2648 if (!tt_local_entry
)
2650 /* Check if the client has been logically deleted (but is kept for
2651 * consistency purpose)
2653 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2654 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2659 batadv_tt_local_entry_free_ref(tt_local_entry
);
2664 * batadv_handle_tt_response - process incoming tt reply
2665 * @bat_priv: the bat priv with all the soft interface information
2666 * @tt_data: tt data containing the tt request information
2667 * @resp_src: mac address of tt reply sender
2668 * @num_entries: number of tt change entries appended to the tt data
2670 static void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2671 struct batadv_tvlv_tt_data
*tt_data
,
2672 uint8_t *resp_src
, uint16_t num_entries
)
2674 struct batadv_tt_req_node
*node
, *safe
;
2675 struct batadv_orig_node
*orig_node
= NULL
;
2676 struct batadv_tvlv_tt_change
*tt_change
;
2677 uint8_t *tvlv_ptr
= (uint8_t *)tt_data
;
2678 uint16_t change_offset
;
2680 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2681 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2682 resp_src
, tt_data
->ttvn
, num_entries
,
2683 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2685 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2689 spin_lock_bh(&orig_node
->tt_lock
);
2691 change_offset
= sizeof(struct batadv_tvlv_tt_vlan_data
);
2692 change_offset
*= ntohs(tt_data
->num_vlan
);
2693 change_offset
+= sizeof(*tt_data
);
2694 tvlv_ptr
+= change_offset
;
2696 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_ptr
;
2697 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
) {
2698 batadv_tt_fill_gtable(bat_priv
, tt_change
, tt_data
->ttvn
,
2699 resp_src
, num_entries
);
2701 batadv_tt_update_changes(bat_priv
, orig_node
, num_entries
,
2702 tt_data
->ttvn
, tt_change
);
2705 /* Recalculate the CRC for this orig_node and store it */
2706 batadv_tt_global_update_crc(bat_priv
, orig_node
);
2708 spin_unlock_bh(&orig_node
->tt_lock
);
2710 /* Delete the tt_req_node from pending tt_requests list */
2711 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2712 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2713 if (!batadv_compare_eth(node
->addr
, resp_src
))
2715 list_del(&node
->list
);
2719 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2722 batadv_orig_node_free_ref(orig_node
);
2725 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
2727 struct batadv_tt_roam_node
*node
, *safe
;
2729 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2731 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2732 list_del(&node
->list
);
2736 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2739 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
2741 struct batadv_tt_roam_node
*node
, *safe
;
2743 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2744 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2745 if (!batadv_has_timed_out(node
->first_time
,
2746 BATADV_ROAMING_MAX_TIME
))
2749 list_del(&node
->list
);
2752 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2755 /* This function checks whether the client already reached the
2756 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2759 * returns true if the ROAMING_ADV can be sent, false otherwise
2761 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
,
2764 struct batadv_tt_roam_node
*tt_roam_node
;
2767 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2768 /* The new tt_req will be issued only if I'm not waiting for a
2769 * reply from the same orig_node yet
2771 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
2772 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
2775 if (batadv_has_timed_out(tt_roam_node
->first_time
,
2776 BATADV_ROAMING_MAX_TIME
))
2779 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
2780 /* Sorry, you roamed too many times! */
2787 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
2791 tt_roam_node
->first_time
= jiffies
;
2792 atomic_set(&tt_roam_node
->counter
,
2793 BATADV_ROAMING_MAX_COUNT
- 1);
2794 memcpy(tt_roam_node
->addr
, client
, ETH_ALEN
);
2796 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
2801 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2806 * batadv_send_roam_adv - send a roaming advertisement message
2807 * @bat_priv: the bat priv with all the soft interface information
2808 * @client: mac address of the roaming client
2809 * @vid: VLAN identifier
2810 * @orig_node: message destination
2812 * Send a ROAMING_ADV message to the node which was previously serving this
2813 * client. This is done to inform the node that from now on all traffic destined
2814 * for this particular roamed client has to be forwarded to the sender of the
2817 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
2819 struct batadv_orig_node
*orig_node
)
2821 struct batadv_hard_iface
*primary_if
;
2822 struct batadv_tvlv_roam_adv tvlv_roam
;
2824 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2828 /* before going on we have to check whether the client has
2829 * already roamed to us too many times
2831 if (!batadv_tt_check_roam_count(bat_priv
, client
))
2834 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2835 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2836 orig_node
->orig
, client
, BATADV_PRINT_VID(vid
));
2838 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
2840 memcpy(tvlv_roam
.client
, client
, sizeof(tvlv_roam
.client
));
2841 tvlv_roam
.vid
= htons(vid
);
2843 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2844 orig_node
->orig
, BATADV_TVLV_ROAM
, 1,
2845 &tvlv_roam
, sizeof(tvlv_roam
));
2849 batadv_hardif_free_ref(primary_if
);
2852 static void batadv_tt_purge(struct work_struct
*work
)
2854 struct delayed_work
*delayed_work
;
2855 struct batadv_priv_tt
*priv_tt
;
2856 struct batadv_priv
*bat_priv
;
2858 delayed_work
= container_of(work
, struct delayed_work
, work
);
2859 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
2860 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
2862 batadv_tt_local_purge(bat_priv
);
2863 batadv_tt_global_purge(bat_priv
);
2864 batadv_tt_req_purge(bat_priv
);
2865 batadv_tt_roam_purge(bat_priv
);
2867 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
2868 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
2871 void batadv_tt_free(struct batadv_priv
*bat_priv
)
2873 batadv_tvlv_container_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
2874 batadv_tvlv_handler_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
2876 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
2878 batadv_tt_local_table_free(bat_priv
);
2879 batadv_tt_global_table_free(bat_priv
);
2880 batadv_tt_req_list_free(bat_priv
);
2881 batadv_tt_changes_list_free(bat_priv
);
2882 batadv_tt_roam_list_free(bat_priv
);
2884 kfree(bat_priv
->tt
.last_changeset
);
2888 * batadv_tt_local_set_flags - set or unset the specified flags on the local
2889 * table and possibly count them in the TT size
2890 * @bat_priv: the bat priv with all the soft interface information
2891 * @flags: the flag to switch
2892 * @enable: whether to set or unset the flag
2893 * @count: whether to increase the TT size by the number of changed entries
2895 static void batadv_tt_local_set_flags(struct batadv_priv
*bat_priv
,
2896 uint16_t flags
, bool enable
, bool count
)
2898 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2899 struct batadv_tt_common_entry
*tt_common_entry
;
2900 uint16_t changed_num
= 0;
2901 struct hlist_head
*head
;
2907 for (i
= 0; i
< hash
->size
; i
++) {
2908 head
= &hash
->table
[i
];
2911 hlist_for_each_entry_rcu(tt_common_entry
,
2914 if ((tt_common_entry
->flags
& flags
) == flags
)
2916 tt_common_entry
->flags
|= flags
;
2918 if (!(tt_common_entry
->flags
& flags
))
2920 tt_common_entry
->flags
&= ~flags
;
2927 batadv_tt_local_size_inc(bat_priv
,
2928 tt_common_entry
->vid
);
2934 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
2935 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
2937 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2938 struct batadv_tt_common_entry
*tt_common
;
2939 struct batadv_tt_local_entry
*tt_local
;
2940 struct hlist_node
*node_tmp
;
2941 struct hlist_head
*head
;
2942 spinlock_t
*list_lock
; /* protects write access to the hash lists */
2948 for (i
= 0; i
< hash
->size
; i
++) {
2949 head
= &hash
->table
[i
];
2950 list_lock
= &hash
->list_locks
[i
];
2952 spin_lock_bh(list_lock
);
2953 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
2955 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
2958 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2959 "Deleting local tt entry (%pM, vid: %d): pending\n",
2961 BATADV_PRINT_VID(tt_common
->vid
));
2963 batadv_tt_local_size_dec(bat_priv
, tt_common
->vid
);
2964 hlist_del_rcu(&tt_common
->hash_entry
);
2965 tt_local
= container_of(tt_common
,
2966 struct batadv_tt_local_entry
,
2968 batadv_tt_local_entry_free_ref(tt_local
);
2970 spin_unlock_bh(list_lock
);
2975 * batadv_tt_local_commit_changes - commit all pending local tt changes which
2976 * have been queued in the time since the last commit
2977 * @bat_priv: the bat priv with all the soft interface information
2979 void batadv_tt_local_commit_changes(struct batadv_priv
*bat_priv
)
2981 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2983 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1) {
2984 if (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))
2985 batadv_tt_tvlv_container_update(bat_priv
);
2989 batadv_tt_local_set_flags(bat_priv
, BATADV_TT_CLIENT_NEW
, false, true);
2991 batadv_tt_local_purge_pending_clients(bat_priv
);
2992 batadv_tt_local_update_crc(bat_priv
);
2994 /* Increment the TTVN only once per OGM interval */
2995 atomic_inc(&bat_priv
->tt
.vn
);
2996 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2997 "Local changes committed, updating to ttvn %u\n",
2998 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
3000 /* reset the sending counter */
3001 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
3002 batadv_tt_tvlv_container_update(bat_priv
);
3005 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3008 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, uint8_t *src
,
3009 uint8_t *dst
, unsigned short vid
)
3011 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
3012 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
3013 struct batadv_softif_vlan
*vlan
;
3016 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
3017 if (!vlan
|| !atomic_read(&vlan
->ap_isolation
))
3020 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
, vid
);
3021 if (!tt_local_entry
)
3024 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
, vid
);
3025 if (!tt_global_entry
)
3028 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
3035 batadv_softif_vlan_free_ref(vlan
);
3036 if (tt_global_entry
)
3037 batadv_tt_global_entry_free_ref(tt_global_entry
);
3039 batadv_tt_local_entry_free_ref(tt_local_entry
);
3044 * batadv_tt_update_orig - update global translation table with new tt
3045 * information received via ogms
3046 * @bat_priv: the bat priv with all the soft interface information
3047 * @orig: the orig_node of the ogm
3048 * @tt_vlan: pointer to the first tvlv VLAN entry
3049 * @tt_num_vlan: number of tvlv VLAN entries
3050 * @tt_change: pointer to the first entry in the TT buffer
3051 * @tt_num_changes: number of tt changes inside the tt buffer
3052 * @ttvn: translation table version number of this changeset
3053 * @tt_crc: crc32 checksum of orig node's translation table
3055 static void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
3056 struct batadv_orig_node
*orig_node
,
3057 const void *tt_buff
, uint16_t tt_num_vlan
,
3058 struct batadv_tvlv_tt_change
*tt_change
,
3059 uint16_t tt_num_changes
, uint8_t ttvn
)
3061 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
3062 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3063 bool full_table
= true;
3065 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)tt_buff
;
3066 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3067 * increased by one -> we can apply the attached changes
3069 if ((!orig_node
->tt_initialised
&& ttvn
== 1) ||
3070 ttvn
- orig_ttvn
== 1) {
3071 /* the OGM could not contain the changes due to their size or
3072 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3074 * In this case send a tt request
3076 if (!tt_num_changes
) {
3081 spin_lock_bh(&orig_node
->tt_lock
);
3083 tt_change
= (struct batadv_tvlv_tt_change
*)tt_buff
;
3084 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
3087 /* Even if we received the precomputed crc with the OGM, we
3088 * prefer to recompute it to spot any possible inconsistency
3089 * in the global table
3091 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3093 spin_unlock_bh(&orig_node
->tt_lock
);
3095 /* The ttvn alone is not enough to guarantee consistency
3096 * because a single value could represent different states
3097 * (due to the wrap around). Thus a node has to check whether
3098 * the resulting table (after applying the changes) is still
3099 * consistent or not. E.g. a node could disconnect while its
3100 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3101 * checking the CRC value is mandatory to detect the
3104 if (!batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3108 /* if we missed more than one change or our tables are not
3109 * in sync anymore -> request fresh tt data
3111 if (!orig_node
->tt_initialised
|| ttvn
!= orig_ttvn
||
3112 !batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3115 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3116 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3117 orig_node
->orig
, ttvn
, orig_ttvn
,
3119 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
3120 tt_vlan
, tt_num_vlan
,
3128 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3129 * @bat_priv: the bat priv with all the soft interface information
3130 * @addr: the mac address of the client to check
3131 * @vid: VLAN identifier
3133 * Returns true if we know that the client has moved from its old originator
3134 * to another one. This entry is still kept for consistency purposes and will be
3135 * deleted later by a DEL or because of timeout
3137 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
3138 uint8_t *addr
, unsigned short vid
)
3140 struct batadv_tt_global_entry
*tt_global_entry
;
3143 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3144 if (!tt_global_entry
)
3147 ret
= tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3148 batadv_tt_global_entry_free_ref(tt_global_entry
);
3154 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3155 * @bat_priv: the bat priv with all the soft interface information
3156 * @addr: the mac address of the local client to query
3157 * @vid: VLAN identifier
3159 * Returns true if the local client is known to be roaming (it is not served by
3160 * this node anymore) or not. If yes, the client is still present in the table
3161 * to keep the latter consistent with the node TTVN
3163 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
3164 uint8_t *addr
, unsigned short vid
)
3166 struct batadv_tt_local_entry
*tt_local_entry
;
3169 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3170 if (!tt_local_entry
)
3173 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3174 batadv_tt_local_entry_free_ref(tt_local_entry
);
3179 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
3180 struct batadv_orig_node
*orig_node
,
3181 const unsigned char *addr
,
3186 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
, vid
,
3187 BATADV_TT_CLIENT_TEMP
,
3188 atomic_read(&orig_node
->last_ttvn
)))
3191 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3192 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3193 addr
, BATADV_PRINT_VID(vid
), orig_node
->orig
);
3200 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3201 * @bat_priv: the bat priv with all the soft interface information
3202 * @orig: the orig_node of the ogm
3203 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3204 * @tvlv_value: tvlv buffer containing the gateway data
3205 * @tvlv_value_len: tvlv buffer length
3207 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv
*bat_priv
,
3208 struct batadv_orig_node
*orig
,
3209 uint8_t flags
, void *tvlv_value
,
3210 uint16_t tvlv_value_len
)
3212 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3213 struct batadv_tvlv_tt_change
*tt_change
;
3214 struct batadv_tvlv_tt_data
*tt_data
;
3215 uint16_t num_entries
, num_vlan
;
3217 if (tvlv_value_len
< sizeof(*tt_data
))
3220 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3221 tvlv_value_len
-= sizeof(*tt_data
);
3223 num_vlan
= ntohs(tt_data
->num_vlan
);
3225 if (tvlv_value_len
< sizeof(*tt_vlan
) * num_vlan
)
3228 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
3229 tt_change
= (struct batadv_tvlv_tt_change
*)(tt_vlan
+ num_vlan
);
3230 tvlv_value_len
-= sizeof(*tt_vlan
) * num_vlan
;
3232 num_entries
= batadv_tt_entries(tvlv_value_len
);
3234 batadv_tt_update_orig(bat_priv
, orig
, tt_vlan
, num_vlan
, tt_change
,
3235 num_entries
, tt_data
->ttvn
);
3239 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3241 * @bat_priv: the bat priv with all the soft interface information
3242 * @src: mac address of tt tvlv sender
3243 * @dst: mac address of tt tvlv recipient
3244 * @tvlv_value: tvlv buffer containing the tt data
3245 * @tvlv_value_len: tvlv buffer length
3247 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3250 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3251 uint8_t *src
, uint8_t *dst
,
3253 uint16_t tvlv_value_len
)
3255 struct batadv_tvlv_tt_data
*tt_data
;
3256 uint16_t tt_vlan_len
, tt_num_entries
;
3260 if (tvlv_value_len
< sizeof(*tt_data
))
3261 return NET_RX_SUCCESS
;
3263 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3264 tvlv_value_len
-= sizeof(*tt_data
);
3266 tt_vlan_len
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3267 tt_vlan_len
*= ntohs(tt_data
->num_vlan
);
3269 if (tvlv_value_len
< tt_vlan_len
)
3270 return NET_RX_SUCCESS
;
3272 tvlv_value_len
-= tt_vlan_len
;
3273 tt_num_entries
= batadv_tt_entries(tvlv_value_len
);
3275 switch (tt_data
->flags
& BATADV_TT_DATA_TYPE_MASK
) {
3276 case BATADV_TT_REQUEST
:
3277 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
3279 /* If this node cannot provide a TT response the tt_request is
3282 ret
= batadv_send_tt_response(bat_priv
, tt_data
, src
, dst
);
3284 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3289 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3290 "Routing TT_REQUEST to %pM [%c]\n",
3292 /* tvlv API will re-route the packet */
3296 case BATADV_TT_RESPONSE
:
3297 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
3299 if (batadv_is_my_mac(bat_priv
, dst
)) {
3300 batadv_handle_tt_response(bat_priv
, tt_data
,
3301 src
, tt_num_entries
);
3302 return NET_RX_SUCCESS
;
3305 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3310 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3311 "Routing TT_RESPONSE to %pM [%c]\n", dst
, tt_flag
);
3313 /* tvlv API will re-route the packet */
3317 return NET_RX_SUCCESS
;
3321 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3322 * @bat_priv: the bat priv with all the soft interface information
3323 * @src: mac address of tt tvlv sender
3324 * @dst: mac address of tt tvlv recipient
3325 * @tvlv_value: tvlv buffer containing the tt data
3326 * @tvlv_value_len: tvlv buffer length
3328 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3331 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3332 uint8_t *src
, uint8_t *dst
,
3334 uint16_t tvlv_value_len
)
3336 struct batadv_tvlv_roam_adv
*roaming_adv
;
3337 struct batadv_orig_node
*orig_node
= NULL
;
3339 /* If this node is not the intended recipient of the
3340 * roaming advertisement the packet is forwarded
3341 * (the tvlv API will re-route the packet).
3343 if (!batadv_is_my_mac(bat_priv
, dst
))
3346 if (tvlv_value_len
< sizeof(*roaming_adv
))
3349 orig_node
= batadv_orig_hash_find(bat_priv
, src
);
3353 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
3354 roaming_adv
= (struct batadv_tvlv_roam_adv
*)tvlv_value
;
3356 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3357 "Received ROAMING_ADV from %pM (client %pM)\n",
3358 src
, roaming_adv
->client
);
3360 batadv_tt_global_add(bat_priv
, orig_node
, roaming_adv
->client
,
3361 ntohs(roaming_adv
->vid
), BATADV_TT_CLIENT_ROAM
,
3362 atomic_read(&orig_node
->last_ttvn
) + 1);
3366 batadv_orig_node_free_ref(orig_node
);
3367 return NET_RX_SUCCESS
;
3371 * batadv_tt_init - initialise the translation table internals
3372 * @bat_priv: the bat priv with all the soft interface information
3374 * Return 0 on success or negative error number in case of failure.
3376 int batadv_tt_init(struct batadv_priv
*bat_priv
)
3380 ret
= batadv_tt_local_init(bat_priv
);
3384 ret
= batadv_tt_global_init(bat_priv
);
3388 batadv_tvlv_handler_register(bat_priv
, batadv_tt_tvlv_ogm_handler_v1
,
3389 batadv_tt_tvlv_unicast_handler_v1
,
3390 BATADV_TVLV_TT
, 1, BATADV_NO_FLAGS
);
3392 batadv_tvlv_handler_register(bat_priv
, NULL
,
3393 batadv_roam_tvlv_unicast_handler_v1
,
3394 BATADV_TVLV_ROAM
, 1, BATADV_NO_FLAGS
);
3396 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
3397 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3398 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));