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 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
, vid
);
1157 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
, vid
);
1159 /* if the node already has a local client for this entry, it has to wait
1160 * for a roaming advertisement instead of manually messing up the global
1163 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
1164 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
1167 if (!tt_global_entry
) {
1168 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
1169 if (!tt_global_entry
)
1172 common
= &tt_global_entry
->common
;
1173 memcpy(common
->addr
, tt_addr
, ETH_ALEN
);
1176 common
->flags
= flags
;
1177 tt_global_entry
->roam_at
= 0;
1178 /* node must store current time in case of roaming. This is
1179 * needed to purge this entry out on timeout (if nobody claims
1182 if (flags
& BATADV_TT_CLIENT_ROAM
)
1183 tt_global_entry
->roam_at
= jiffies
;
1184 atomic_set(&common
->refcount
, 2);
1185 common
->added_at
= jiffies
;
1187 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
1188 spin_lock_init(&tt_global_entry
->list_lock
);
1190 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
1192 batadv_choose_tt
, common
,
1193 &common
->hash_entry
);
1195 if (unlikely(hash_added
!= 0)) {
1196 /* remove the reference for the hash */
1197 batadv_tt_global_entry_free_ref(tt_global_entry
);
1201 common
= &tt_global_entry
->common
;
1202 /* If there is already a global entry, we can use this one for
1204 * But if we are trying to add a temporary client then here are
1205 * two options at this point:
1206 * 1) the global client is not a temporary client: the global
1207 * client has to be left as it is, temporary information
1208 * should never override any already known client state
1209 * 2) the global client is a temporary client: purge the
1210 * originator list and add the new one orig_entry
1212 if (flags
& BATADV_TT_CLIENT_TEMP
) {
1213 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
1215 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
1218 batadv_tt_global_del_orig_list(tt_global_entry
);
1219 goto add_orig_entry
;
1222 /* if the client was temporary added before receiving the first
1223 * OGM announcing it, we have to clear the TEMP flag
1225 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
1227 /* the change can carry possible "attribute" flags like the
1228 * TT_CLIENT_WIFI, therefore they have to be copied in the
1231 tt_global_entry
->common
.flags
|= flags
;
1233 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1234 * one originator left in the list and we previously received a
1235 * delete + roaming change for this originator.
1237 * We should first delete the old originator before adding the
1240 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
1241 batadv_tt_global_del_orig_list(tt_global_entry
);
1242 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
1243 tt_global_entry
->roam_at
= 0;
1247 /* add the new orig_entry (if needed) or update it */
1248 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
1250 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1251 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1252 common
->addr
, BATADV_PRINT_VID(common
->vid
),
1258 /* remove address from local hash if present */
1259 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
, vid
,
1260 "global tt received",
1261 flags
& BATADV_TT_CLIENT_ROAM
);
1262 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
1264 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
1265 /* this is a normal global add. Therefore the client is not in a
1266 * roaming state anymore.
1268 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
1271 if (tt_global_entry
)
1272 batadv_tt_global_entry_free_ref(tt_global_entry
);
1274 batadv_tt_local_entry_free_ref(tt_local_entry
);
1278 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
1279 * @tt_global_entry: global translation table entry to be analyzed
1281 * This functon assumes the caller holds rcu_read_lock().
1282 * Returns best originator list entry or NULL on errors.
1284 static struct batadv_tt_orig_list_entry
*
1285 batadv_transtable_best_orig(struct batadv_tt_global_entry
*tt_global_entry
)
1287 struct batadv_neigh_node
*router
= NULL
;
1288 struct hlist_head
*head
;
1289 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
1292 head
= &tt_global_entry
->orig_list
;
1293 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1294 router
= batadv_orig_node_get_router(orig_entry
->orig_node
);
1298 if (router
->tq_avg
> best_tq
) {
1299 best_entry
= orig_entry
;
1300 best_tq
= router
->tq_avg
;
1303 batadv_neigh_node_free_ref(router
);
1309 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1310 * for this global entry
1311 * @tt_global_entry: global translation table entry to be printed
1312 * @seq: debugfs table seq_file struct
1314 * This functon assumes the caller holds rcu_read_lock().
1317 batadv_tt_global_print_entry(struct batadv_tt_global_entry
*tt_global_entry
,
1318 struct seq_file
*seq
)
1320 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
1321 struct batadv_tt_common_entry
*tt_common_entry
;
1322 struct batadv_orig_node_vlan
*vlan
;
1323 struct hlist_head
*head
;
1327 tt_common_entry
= &tt_global_entry
->common
;
1328 flags
= tt_common_entry
->flags
;
1330 best_entry
= batadv_transtable_best_orig(tt_global_entry
);
1332 vlan
= batadv_orig_node_vlan_get(best_entry
->orig_node
,
1333 tt_common_entry
->vid
);
1336 " * Cannot retrieve VLAN %d for originator %pM\n",
1337 BATADV_PRINT_VID(tt_common_entry
->vid
),
1338 best_entry
->orig_node
->orig
);
1342 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
1344 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n",
1345 '*', tt_global_entry
->common
.addr
,
1346 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1347 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
1348 last_ttvn
, vlan
->tt
.crc
,
1349 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1350 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1351 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1353 batadv_orig_node_vlan_free_ref(vlan
);
1357 head
= &tt_global_entry
->orig_list
;
1359 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1360 if (best_entry
== orig_entry
)
1363 vlan
= batadv_orig_node_vlan_get(orig_entry
->orig_node
,
1364 tt_common_entry
->vid
);
1367 " + Cannot retrieve VLAN %d for originator %pM\n",
1368 BATADV_PRINT_VID(tt_common_entry
->vid
),
1369 orig_entry
->orig_node
->orig
);
1373 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
1375 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n",
1376 '+', tt_global_entry
->common
.addr
,
1377 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1378 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1379 last_ttvn
, vlan
->tt
.crc
,
1380 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1381 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1382 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1384 batadv_orig_node_vlan_free_ref(vlan
);
1388 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1390 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1391 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1392 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1393 struct batadv_tt_common_entry
*tt_common_entry
;
1394 struct batadv_tt_global_entry
*tt_global
;
1395 struct batadv_hard_iface
*primary_if
;
1396 struct hlist_head
*head
;
1399 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1404 "Globally announced TT entries received via the mesh %s\n",
1406 seq_printf(seq
, " %-13s %s %s %-15s %s (%-10s) %s\n",
1407 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1410 for (i
= 0; i
< hash
->size
; i
++) {
1411 head
= &hash
->table
[i
];
1414 hlist_for_each_entry_rcu(tt_common_entry
,
1416 tt_global
= container_of(tt_common_entry
,
1417 struct batadv_tt_global_entry
,
1419 batadv_tt_global_print_entry(tt_global
, seq
);
1425 batadv_hardif_free_ref(primary_if
);
1429 /* deletes the orig list of a tt_global_entry */
1431 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1433 struct hlist_head
*head
;
1434 struct hlist_node
*safe
;
1435 struct batadv_tt_orig_list_entry
*orig_entry
;
1437 spin_lock_bh(&tt_global_entry
->list_lock
);
1438 head
= &tt_global_entry
->orig_list
;
1439 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1440 hlist_del_rcu(&orig_entry
->list
);
1441 batadv_tt_global_size_dec(orig_entry
->orig_node
,
1442 tt_global_entry
->common
.vid
);
1443 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1445 spin_unlock_bh(&tt_global_entry
->list_lock
);
1449 batadv_tt_global_del_orig_entry(struct batadv_priv
*bat_priv
,
1450 struct batadv_tt_global_entry
*tt_global_entry
,
1451 struct batadv_orig_node
*orig_node
,
1452 const char *message
)
1454 struct hlist_head
*head
;
1455 struct hlist_node
*safe
;
1456 struct batadv_tt_orig_list_entry
*orig_entry
;
1459 spin_lock_bh(&tt_global_entry
->list_lock
);
1460 head
= &tt_global_entry
->orig_list
;
1461 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1462 if (orig_entry
->orig_node
== orig_node
) {
1463 vid
= tt_global_entry
->common
.vid
;
1464 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1465 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1467 tt_global_entry
->common
.addr
,
1468 BATADV_PRINT_VID(vid
), message
);
1469 hlist_del_rcu(&orig_entry
->list
);
1470 batadv_tt_global_size_dec(orig_node
,
1471 tt_global_entry
->common
.vid
);
1472 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1475 spin_unlock_bh(&tt_global_entry
->list_lock
);
1478 /* If the client is to be deleted, we check if it is the last origantor entry
1479 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1480 * timer, otherwise we simply remove the originator scheduled for deletion.
1483 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1484 struct batadv_tt_global_entry
*tt_global_entry
,
1485 struct batadv_orig_node
*orig_node
,
1486 const char *message
)
1488 bool last_entry
= true;
1489 struct hlist_head
*head
;
1490 struct batadv_tt_orig_list_entry
*orig_entry
;
1492 /* no local entry exists, case 1:
1493 * Check if this is the last one or if other entries exist.
1497 head
= &tt_global_entry
->orig_list
;
1498 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1499 if (orig_entry
->orig_node
!= orig_node
) {
1507 /* its the last one, mark for roaming. */
1508 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1509 tt_global_entry
->roam_at
= jiffies
;
1511 /* there is another entry, we can simply delete this
1512 * one and can still use the other one.
1514 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1515 orig_node
, message
);
1519 * batadv_tt_global_del - remove a client from the global table
1520 * @bat_priv: the bat priv with all the soft interface information
1521 * @orig_node: an originator serving this client
1522 * @addr: the mac address of the client
1523 * @vid: VLAN identifier
1524 * @message: a message explaining the reason for deleting the client to print
1525 * for debugging purpose
1526 * @roaming: true if the deletion has been triggered by a roaming event
1528 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1529 struct batadv_orig_node
*orig_node
,
1530 const unsigned char *addr
, unsigned short vid
,
1531 const char *message
, bool roaming
)
1533 struct batadv_tt_global_entry
*tt_global_entry
;
1534 struct batadv_tt_local_entry
*local_entry
= NULL
;
1536 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1537 if (!tt_global_entry
)
1541 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1542 orig_node
, message
);
1544 if (hlist_empty(&tt_global_entry
->orig_list
))
1545 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1551 /* if we are deleting a global entry due to a roam
1552 * event, there are two possibilities:
1553 * 1) the client roamed from node A to node B => if there
1554 * is only one originator left for this client, we mark
1555 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1556 * wait for node B to claim it. In case of timeout
1557 * the entry is purged.
1559 * If there are other originators left, we directly delete
1561 * 2) the client roamed to us => we can directly delete
1562 * the global entry, since it is useless now.
1564 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1565 tt_global_entry
->common
.addr
,
1568 /* local entry exists, case 2: client roamed to us. */
1569 batadv_tt_global_del_orig_list(tt_global_entry
);
1570 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1572 /* no local entry exists, case 1: check for roaming */
1573 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1574 orig_node
, message
);
1578 if (tt_global_entry
)
1579 batadv_tt_global_entry_free_ref(tt_global_entry
);
1581 batadv_tt_local_entry_free_ref(local_entry
);
1584 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1585 struct batadv_orig_node
*orig_node
,
1586 const char *message
)
1588 struct batadv_tt_global_entry
*tt_global
;
1589 struct batadv_tt_common_entry
*tt_common_entry
;
1591 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1592 struct hlist_node
*safe
;
1593 struct hlist_head
*head
;
1594 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1600 for (i
= 0; i
< hash
->size
; i
++) {
1601 head
= &hash
->table
[i
];
1602 list_lock
= &hash
->list_locks
[i
];
1604 spin_lock_bh(list_lock
);
1605 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1607 tt_global
= container_of(tt_common_entry
,
1608 struct batadv_tt_global_entry
,
1611 batadv_tt_global_del_orig_entry(bat_priv
, tt_global
,
1612 orig_node
, message
);
1614 if (hlist_empty(&tt_global
->orig_list
)) {
1615 vid
= tt_global
->common
.vid
;
1616 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1617 "Deleting global tt entry %pM (vid: %d): %s\n",
1618 tt_global
->common
.addr
,
1619 BATADV_PRINT_VID(vid
), message
);
1620 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1621 batadv_tt_global_entry_free_ref(tt_global
);
1624 spin_unlock_bh(list_lock
);
1626 orig_node
->tt_initialised
= false;
1629 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1633 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1634 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1636 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1637 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1639 *msg
= "Roaming timeout\n";
1642 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1643 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1645 *msg
= "Temporary client timeout\n";
1651 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1653 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1654 struct hlist_head
*head
;
1655 struct hlist_node
*node_tmp
;
1656 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1659 struct batadv_tt_common_entry
*tt_common
;
1660 struct batadv_tt_global_entry
*tt_global
;
1662 for (i
= 0; i
< hash
->size
; i
++) {
1663 head
= &hash
->table
[i
];
1664 list_lock
= &hash
->list_locks
[i
];
1666 spin_lock_bh(list_lock
);
1667 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
1669 tt_global
= container_of(tt_common
,
1670 struct batadv_tt_global_entry
,
1673 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1676 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1677 "Deleting global tt entry %pM (vid: %d): %s\n",
1678 tt_global
->common
.addr
,
1679 BATADV_PRINT_VID(tt_global
->common
.vid
),
1682 hlist_del_rcu(&tt_common
->hash_entry
);
1684 batadv_tt_global_entry_free_ref(tt_global
);
1686 spin_unlock_bh(list_lock
);
1690 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1692 struct batadv_hashtable
*hash
;
1693 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1694 struct batadv_tt_common_entry
*tt_common_entry
;
1695 struct batadv_tt_global_entry
*tt_global
;
1696 struct hlist_node
*node_tmp
;
1697 struct hlist_head
*head
;
1700 if (!bat_priv
->tt
.global_hash
)
1703 hash
= bat_priv
->tt
.global_hash
;
1705 for (i
= 0; i
< hash
->size
; i
++) {
1706 head
= &hash
->table
[i
];
1707 list_lock
= &hash
->list_locks
[i
];
1709 spin_lock_bh(list_lock
);
1710 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1712 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1713 tt_global
= container_of(tt_common_entry
,
1714 struct batadv_tt_global_entry
,
1716 batadv_tt_global_entry_free_ref(tt_global
);
1718 spin_unlock_bh(list_lock
);
1721 batadv_hash_destroy(hash
);
1723 bat_priv
->tt
.global_hash
= NULL
;
1727 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
1728 struct batadv_tt_global_entry
*tt_global_entry
)
1732 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
1733 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
1740 * batadv_transtable_search - get the mesh destination for a given client
1741 * @bat_priv: the bat priv with all the soft interface information
1742 * @src: mac address of the source client
1743 * @addr: mac address of the destination client
1744 * @vid: VLAN identifier
1746 * Returns a pointer to the originator that was selected as destination in the
1747 * mesh for contacting the client 'addr', NULL otherwise.
1748 * In case of multiple originators serving the same client, the function returns
1749 * the best one (best in terms of metric towards the destination node).
1751 * If the two clients are AP isolated the function returns NULL.
1753 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
1755 const uint8_t *addr
,
1758 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
1759 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
1760 struct batadv_orig_node
*orig_node
= NULL
;
1761 struct batadv_tt_orig_list_entry
*best_entry
;
1762 bool ap_isolation_enabled
= false;
1763 struct batadv_softif_vlan
*vlan
;
1765 /* if the AP isolation is requested on a VLAN, then check for its
1766 * setting in the proper VLAN private data structure
1768 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1770 ap_isolation_enabled
= atomic_read(&vlan
->ap_isolation
);
1771 batadv_softif_vlan_free_ref(vlan
);
1774 if (src
&& ap_isolation_enabled
) {
1775 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
, vid
);
1776 if (!tt_local_entry
||
1777 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
1781 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1782 if (!tt_global_entry
)
1785 /* check whether the clients should not communicate due to AP
1788 if (tt_local_entry
&&
1789 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
1793 best_entry
= batadv_transtable_best_orig(tt_global_entry
);
1794 /* found anything? */
1796 orig_node
= best_entry
->orig_node
;
1797 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1802 if (tt_global_entry
)
1803 batadv_tt_global_entry_free_ref(tt_global_entry
);
1805 batadv_tt_local_entry_free_ref(tt_local_entry
);
1811 * batadv_tt_global_crc - calculates the checksum of the local table belonging
1812 * to the given orig_node
1813 * @bat_priv: the bat priv with all the soft interface information
1814 * @orig_node: originator for which the CRC should be computed
1815 * @vid: VLAN identifier for which the CRC32 has to be computed
1817 * This function computes the checksum for the global table corresponding to a
1818 * specific originator. In particular, the checksum is computed as follows: For
1819 * each client connected to the originator the CRC32C of the MAC address and the
1820 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1823 * The idea behind is that CRC32C should be used as much as possible in order to
1824 * produce a unique hash of the table, but since the order which is used to feed
1825 * the CRC32C function affects the result and since every node in the network
1826 * probably sorts the clients differently, the hash function cannot be directly
1827 * computed over the entire table. Hence the CRC32C is used only on
1828 * the single client entry, while all the results are then xor'ed together
1829 * because the XOR operation can combine them all while trying to reduce the
1830 * noise as much as possible.
1832 * Returns the checksum of the global table of a given originator.
1834 static uint32_t batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
1835 struct batadv_orig_node
*orig_node
,
1838 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1839 struct batadv_tt_common_entry
*tt_common
;
1840 struct batadv_tt_global_entry
*tt_global
;
1841 struct hlist_head
*head
;
1842 uint32_t i
, crc_tmp
, crc
= 0;
1844 for (i
= 0; i
< hash
->size
; i
++) {
1845 head
= &hash
->table
[i
];
1848 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1849 tt_global
= container_of(tt_common
,
1850 struct batadv_tt_global_entry
,
1852 /* compute the CRC only for entries belonging to the
1853 * VLAN identified by the vid passed as parameter
1855 if (tt_common
->vid
!= vid
)
1858 /* Roaming clients are in the global table for
1859 * consistency only. They don't have to be
1860 * taken into account while computing the
1863 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
1865 /* Temporary clients have not been announced yet, so
1866 * they have to be skipped while computing the global
1869 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
1872 /* find out if this global entry is announced by this
1875 if (!batadv_tt_global_entry_has_orig(tt_global
,
1879 crc_tmp
= crc32c(0, &tt_common
->vid
,
1880 sizeof(tt_common
->vid
));
1881 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
1890 * batadv_tt_local_crc - calculates the checksum of the local table
1891 * @bat_priv: the bat priv with all the soft interface information
1892 * @vid: VLAN identifier for which the CRC32 has to be computed
1894 * For details about the computation, please refer to the documentation for
1895 * batadv_tt_global_crc().
1897 * Returns the checksum of the local table
1899 static uint32_t batadv_tt_local_crc(struct batadv_priv
*bat_priv
,
1902 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1903 struct batadv_tt_common_entry
*tt_common
;
1904 struct hlist_head
*head
;
1905 uint32_t i
, crc_tmp
, crc
= 0;
1907 for (i
= 0; i
< hash
->size
; i
++) {
1908 head
= &hash
->table
[i
];
1911 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1912 /* compute the CRC only for entries belonging to the
1913 * VLAN identified by vid
1915 if (tt_common
->vid
!= vid
)
1918 /* not yet committed clients have not to be taken into
1919 * account while computing the CRC
1921 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
1924 crc_tmp
= crc32c(0, &tt_common
->vid
,
1925 sizeof(tt_common
->vid
));
1926 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
1934 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
1936 struct batadv_tt_req_node
*node
, *safe
;
1938 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1940 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
1941 list_del(&node
->list
);
1945 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1948 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
1949 struct batadv_orig_node
*orig_node
,
1950 const void *tt_buff
,
1951 uint16_t tt_buff_len
)
1953 /* Replace the old buffer only if I received something in the
1954 * last OGM (the OGM could carry no changes)
1956 spin_lock_bh(&orig_node
->tt_buff_lock
);
1957 if (tt_buff_len
> 0) {
1958 kfree(orig_node
->tt_buff
);
1959 orig_node
->tt_buff_len
= 0;
1960 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
1961 if (orig_node
->tt_buff
) {
1962 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
1963 orig_node
->tt_buff_len
= tt_buff_len
;
1966 spin_unlock_bh(&orig_node
->tt_buff_lock
);
1969 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
1971 struct batadv_tt_req_node
*node
, *safe
;
1973 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1974 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
1975 if (batadv_has_timed_out(node
->issued_at
,
1976 BATADV_TT_REQUEST_TIMEOUT
)) {
1977 list_del(&node
->list
);
1981 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
1984 /* returns the pointer to the new tt_req_node struct if no request
1985 * has already been issued for this orig_node, NULL otherwise
1987 static struct batadv_tt_req_node
*
1988 batadv_new_tt_req_node(struct batadv_priv
*bat_priv
,
1989 struct batadv_orig_node
*orig_node
)
1991 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
1993 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
1994 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
1995 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
1996 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
1997 BATADV_TT_REQUEST_TIMEOUT
))
2001 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
2005 memcpy(tt_req_node
->addr
, orig_node
->orig
, ETH_ALEN
);
2006 tt_req_node
->issued_at
= jiffies
;
2008 list_add(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
2010 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2015 * batadv_tt_local_valid - verify that given tt entry is a valid one
2016 * @entry_ptr: to be checked local tt entry
2017 * @data_ptr: not used but definition required to satisfy the callback prototype
2019 * Returns 1 if the entry is a valid, 0 otherwise.
2021 static int batadv_tt_local_valid(const void *entry_ptr
, const void *data_ptr
)
2023 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2025 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
2030 static int batadv_tt_global_valid(const void *entry_ptr
,
2031 const void *data_ptr
)
2033 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2034 const struct batadv_tt_global_entry
*tt_global_entry
;
2035 const struct batadv_orig_node
*orig_node
= data_ptr
;
2037 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
2038 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
2041 tt_global_entry
= container_of(tt_common_entry
,
2042 struct batadv_tt_global_entry
,
2045 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
2049 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2051 * @bat_priv: the bat priv with all the soft interface information
2052 * @hash: hash table containing the tt entries
2053 * @tt_len: expected tvlv tt data buffer length in number of bytes
2054 * @tvlv_buff: pointer to the buffer to fill with the TT data
2055 * @valid_cb: function to filter tt change entries
2056 * @cb_data: data passed to the filter function as argument
2058 static void batadv_tt_tvlv_generate(struct batadv_priv
*bat_priv
,
2059 struct batadv_hashtable
*hash
,
2060 void *tvlv_buff
, uint16_t tt_len
,
2061 int (*valid_cb
)(const void *, const void *),
2064 struct batadv_tt_common_entry
*tt_common_entry
;
2065 struct batadv_tvlv_tt_change
*tt_change
;
2066 struct hlist_head
*head
;
2067 uint16_t tt_tot
, tt_num_entries
= 0;
2070 tt_tot
= batadv_tt_entries(tt_len
);
2071 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_buff
;
2074 for (i
= 0; i
< hash
->size
; i
++) {
2075 head
= &hash
->table
[i
];
2077 hlist_for_each_entry_rcu(tt_common_entry
,
2079 if (tt_tot
== tt_num_entries
)
2082 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
2085 memcpy(tt_change
->addr
, tt_common_entry
->addr
,
2087 tt_change
->flags
= tt_common_entry
->flags
;
2088 tt_change
->vid
= htons(tt_common_entry
->vid
);
2089 tt_change
->reserved
= 0;
2099 * batadv_tt_global_check_crc - check if all the CRCs are correct
2100 * @orig_node: originator for which the CRCs have to be checked
2101 * @tt_vlan: pointer to the first tvlv VLAN entry
2102 * @num_vlan: number of tvlv VLAN entries
2103 * @create: if true, create VLAN objects if not found
2105 * Return true if all the received CRCs match the locally stored ones, false
2108 static bool batadv_tt_global_check_crc(struct batadv_orig_node
*orig_node
,
2109 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2112 struct batadv_tvlv_tt_vlan_data
*tt_vlan_tmp
;
2113 struct batadv_orig_node_vlan
*vlan
;
2116 /* check if each received CRC matches the locally stored one */
2117 for (i
= 0; i
< num_vlan
; i
++) {
2118 tt_vlan_tmp
= tt_vlan
+ i
;
2120 /* if orig_node is a backbone node for this VLAN, don't check
2121 * the CRC as we ignore all the global entries over it
2123 if (batadv_bla_is_backbone_gw_orig(orig_node
->bat_priv
,
2127 vlan
= batadv_orig_node_vlan_get(orig_node
,
2128 ntohs(tt_vlan_tmp
->vid
));
2132 if (vlan
->tt
.crc
!= ntohl(tt_vlan_tmp
->crc
))
2140 * batadv_tt_local_update_crc - update all the local CRCs
2141 * @bat_priv: the bat priv with all the soft interface information
2143 static void batadv_tt_local_update_crc(struct batadv_priv
*bat_priv
)
2145 struct batadv_softif_vlan
*vlan
;
2147 /* recompute the global CRC for each VLAN */
2149 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
2150 vlan
->tt
.crc
= batadv_tt_local_crc(bat_priv
, vlan
->vid
);
2156 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2157 * @bat_priv: the bat priv with all the soft interface information
2158 * @orig_node: the orig_node for which the CRCs have to be updated
2160 static void batadv_tt_global_update_crc(struct batadv_priv
*bat_priv
,
2161 struct batadv_orig_node
*orig_node
)
2163 struct batadv_orig_node_vlan
*vlan
;
2166 /* recompute the global CRC for each VLAN */
2168 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
2169 /* if orig_node is a backbone node for this VLAN, don't compute
2170 * the CRC as we ignore all the global entries over it
2172 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
2175 crc
= batadv_tt_global_crc(bat_priv
, orig_node
, vlan
->vid
);
2182 * batadv_send_tt_request - send a TT Request message to a given node
2183 * @bat_priv: the bat priv with all the soft interface information
2184 * @dst_orig_node: the destination of the message
2185 * @ttvn: the version number that the source of the message is looking for
2186 * @tt_vlan: pointer to the first tvlv VLAN object to request
2187 * @num_vlan: number of tvlv VLAN entries
2188 * @full_table: ask for the entire translation table if true, while only for the
2189 * last TT diff otherwise
2191 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
2192 struct batadv_orig_node
*dst_orig_node
,
2194 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2195 uint16_t num_vlan
, bool full_table
)
2197 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2198 struct batadv_tt_req_node
*tt_req_node
= NULL
;
2199 struct batadv_tvlv_tt_vlan_data
*tt_vlan_req
;
2200 struct batadv_hard_iface
*primary_if
;
2204 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2208 /* The new tt_req will be issued only if I'm not waiting for a
2209 * reply from the same orig_node yet
2211 tt_req_node
= batadv_new_tt_req_node(bat_priv
, dst_orig_node
);
2215 size
= sizeof(*tvlv_tt_data
) + sizeof(*tt_vlan_req
) * num_vlan
;
2216 tvlv_tt_data
= kzalloc(size
, GFP_ATOMIC
);
2220 tvlv_tt_data
->flags
= BATADV_TT_REQUEST
;
2221 tvlv_tt_data
->ttvn
= ttvn
;
2222 tvlv_tt_data
->num_vlan
= htons(num_vlan
);
2224 /* send all the CRCs within the request. This is needed by intermediate
2225 * nodes to ensure they have the correct table before replying
2227 tt_vlan_req
= (struct batadv_tvlv_tt_vlan_data
*)(tvlv_tt_data
+ 1);
2228 for (i
= 0; i
< num_vlan
; i
++) {
2229 tt_vlan_req
->vid
= tt_vlan
->vid
;
2230 tt_vlan_req
->crc
= tt_vlan
->crc
;
2237 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2239 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
2240 dst_orig_node
->orig
, full_table
? 'F' : '.');
2242 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
2243 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2244 dst_orig_node
->orig
, BATADV_TVLV_TT
, 1,
2245 tvlv_tt_data
, size
);
2250 batadv_hardif_free_ref(primary_if
);
2251 if (ret
&& tt_req_node
) {
2252 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2253 list_del(&tt_req_node
->list
);
2254 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2257 kfree(tvlv_tt_data
);
2262 * batadv_send_other_tt_response - send reply to tt request concerning another
2263 * node's translation table
2264 * @bat_priv: the bat priv with all the soft interface information
2265 * @tt_data: tt data containing the tt request information
2266 * @req_src: mac address of tt request sender
2267 * @req_dst: mac address of tt request recipient
2269 * Returns true if tt request reply was sent, false otherwise.
2271 static bool batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
2272 struct batadv_tvlv_tt_data
*tt_data
,
2273 uint8_t *req_src
, uint8_t *req_dst
)
2275 struct batadv_orig_node
*req_dst_orig_node
;
2276 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
2277 struct batadv_tvlv_tt_change
*tt_change
;
2278 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2279 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
2280 bool ret
= false, full_table
;
2281 uint8_t orig_ttvn
, req_ttvn
;
2285 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2286 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2287 req_src
, tt_data
->ttvn
, req_dst
,
2288 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2290 /* Let's get the orig node of the REAL destination */
2291 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_dst
);
2292 if (!req_dst_orig_node
)
2295 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2296 if (!res_dst_orig_node
)
2299 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
2300 req_ttvn
= tt_data
->ttvn
;
2302 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
2303 /* this node doesn't have the requested data */
2304 if (orig_ttvn
!= req_ttvn
||
2305 !batadv_tt_global_check_crc(req_dst_orig_node
, tt_vlan
,
2306 ntohs(tt_data
->num_vlan
)))
2309 /* If the full table has been explicitly requested */
2310 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
||
2311 !req_dst_orig_node
->tt_buff
)
2316 /* TT fragmentation hasn't been implemented yet, so send as many
2317 * TT entries fit a single packet as possible only
2320 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
2321 tt_len
= req_dst_orig_node
->tt_buff_len
;
2323 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2330 /* Copy the last orig_node's OGM buffer */
2331 memcpy(tt_change
, req_dst_orig_node
->tt_buff
,
2332 req_dst_orig_node
->tt_buff_len
);
2333 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2335 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2336 * in the initial part
2339 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2346 /* fill the rest of the tvlv with the real TT entries */
2347 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.global_hash
,
2349 batadv_tt_global_valid
,
2353 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2354 tvlv_tt_data
->ttvn
= req_ttvn
;
2357 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2359 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2360 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2361 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
,
2362 full_table
? 'F' : '.', req_ttvn
);
2364 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2366 batadv_tvlv_unicast_send(bat_priv
, req_dst_orig_node
->orig
,
2367 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2374 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2377 if (res_dst_orig_node
)
2378 batadv_orig_node_free_ref(res_dst_orig_node
);
2379 if (req_dst_orig_node
)
2380 batadv_orig_node_free_ref(req_dst_orig_node
);
2381 kfree(tvlv_tt_data
);
2386 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2388 * @bat_priv: the bat priv with all the soft interface information
2389 * @tt_data: tt data containing the tt request information
2390 * @req_src: mac address of tt request sender
2392 * Returns true if tt request reply was sent, false otherwise.
2394 static bool batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
2395 struct batadv_tvlv_tt_data
*tt_data
,
2398 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2399 struct batadv_hard_iface
*primary_if
= NULL
;
2400 struct batadv_tvlv_tt_change
*tt_change
;
2401 struct batadv_orig_node
*orig_node
;
2402 uint8_t my_ttvn
, req_ttvn
;
2407 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2408 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2409 req_src
, tt_data
->ttvn
,
2410 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2412 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2414 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2415 req_ttvn
= tt_data
->ttvn
;
2417 orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2421 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2425 /* If the full table has been explicitly requested or the gap
2426 * is too big send the whole local translation table
2428 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
2429 !bat_priv
->tt
.last_changeset
)
2434 /* TT fragmentation hasn't been implemented yet, so send as many
2435 * TT entries fit a single packet as possible only
2438 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
2440 tt_len
= bat_priv
->tt
.last_changeset_len
;
2441 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2448 /* Copy the last orig_node's OGM buffer */
2449 memcpy(tt_change
, bat_priv
->tt
.last_changeset
,
2450 bat_priv
->tt
.last_changeset_len
);
2451 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2453 req_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2455 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2456 * in the initial part
2459 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2466 /* fill the rest of the tvlv with the real TT entries */
2467 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.local_hash
,
2469 batadv_tt_local_valid
, NULL
);
2472 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2473 tvlv_tt_data
->ttvn
= req_ttvn
;
2476 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2478 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2479 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2480 orig_node
->orig
, full_table
? 'F' : '.', req_ttvn
);
2482 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2484 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2485 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2491 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2493 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2495 batadv_orig_node_free_ref(orig_node
);
2497 batadv_hardif_free_ref(primary_if
);
2498 kfree(tvlv_tt_data
);
2499 /* The packet was for this host, so it doesn't need to be re-routed */
2504 * batadv_send_tt_response - send reply to tt request
2505 * @bat_priv: the bat priv with all the soft interface information
2506 * @tt_data: tt data containing the tt request information
2507 * @req_src: mac address of tt request sender
2508 * @req_dst: mac address of tt request recipient
2510 * Returns true if tt request reply was sent, false otherwise.
2512 static bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
2513 struct batadv_tvlv_tt_data
*tt_data
,
2514 uint8_t *req_src
, uint8_t *req_dst
)
2516 if (batadv_is_my_mac(bat_priv
, req_dst
)) {
2517 /* don't answer backbone gws! */
2518 if (batadv_bla_is_backbone_gw_orig(bat_priv
, req_src
))
2521 return batadv_send_my_tt_response(bat_priv
, tt_data
, req_src
);
2523 return batadv_send_other_tt_response(bat_priv
, tt_data
,
2528 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2529 struct batadv_orig_node
*orig_node
,
2530 struct batadv_tvlv_tt_change
*tt_change
,
2531 uint16_t tt_num_changes
, uint8_t ttvn
)
2536 for (i
= 0; i
< tt_num_changes
; i
++) {
2537 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
2538 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
2539 batadv_tt_global_del(bat_priv
, orig_node
,
2540 (tt_change
+ i
)->addr
,
2541 ntohs((tt_change
+ i
)->vid
),
2542 "tt removed by changes",
2545 if (!batadv_tt_global_add(bat_priv
, orig_node
,
2546 (tt_change
+ i
)->addr
,
2547 ntohs((tt_change
+ i
)->vid
),
2548 (tt_change
+ i
)->flags
, ttvn
))
2549 /* In case of problem while storing a
2550 * global_entry, we stop the updating
2551 * procedure without committing the
2552 * ttvn change. This will avoid to send
2553 * corrupted data on tt_request
2558 orig_node
->tt_initialised
= true;
2561 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
2562 struct batadv_tvlv_tt_change
*tt_change
,
2563 uint8_t ttvn
, uint8_t *resp_src
,
2564 uint16_t num_entries
)
2566 struct batadv_orig_node
*orig_node
;
2568 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2572 /* Purge the old table first.. */
2573 batadv_tt_global_del_orig(bat_priv
, orig_node
, "Received full table");
2575 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
, num_entries
,
2578 spin_lock_bh(&orig_node
->tt_buff_lock
);
2579 kfree(orig_node
->tt_buff
);
2580 orig_node
->tt_buff_len
= 0;
2581 orig_node
->tt_buff
= NULL
;
2582 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2584 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2588 batadv_orig_node_free_ref(orig_node
);
2591 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2592 struct batadv_orig_node
*orig_node
,
2593 uint16_t tt_num_changes
, uint8_t ttvn
,
2594 struct batadv_tvlv_tt_change
*tt_change
)
2596 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2597 tt_num_changes
, ttvn
);
2599 batadv_tt_save_orig_buffer(bat_priv
, orig_node
, tt_change
,
2600 batadv_tt_len(tt_num_changes
));
2601 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2605 * batadv_is_my_client - check if a client is served by the local node
2606 * @bat_priv: the bat priv with all the soft interface information
2607 * @addr: the mac adress of the client to check
2608 * @vid: VLAN identifier
2610 * Returns true if the client is served by this node, false otherwise.
2612 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
2615 struct batadv_tt_local_entry
*tt_local_entry
;
2618 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
2619 if (!tt_local_entry
)
2621 /* Check if the client has been logically deleted (but is kept for
2622 * consistency purpose)
2624 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2625 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2630 batadv_tt_local_entry_free_ref(tt_local_entry
);
2635 * batadv_handle_tt_response - process incoming tt reply
2636 * @bat_priv: the bat priv with all the soft interface information
2637 * @tt_data: tt data containing the tt request information
2638 * @resp_src: mac address of tt reply sender
2639 * @num_entries: number of tt change entries appended to the tt data
2641 static void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2642 struct batadv_tvlv_tt_data
*tt_data
,
2643 uint8_t *resp_src
, uint16_t num_entries
)
2645 struct batadv_tt_req_node
*node
, *safe
;
2646 struct batadv_orig_node
*orig_node
= NULL
;
2647 struct batadv_tvlv_tt_change
*tt_change
;
2648 uint8_t *tvlv_ptr
= (uint8_t *)tt_data
;
2649 uint16_t change_offset
;
2651 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2652 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2653 resp_src
, tt_data
->ttvn
, num_entries
,
2654 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2656 /* we should have never asked a backbone gw */
2657 if (batadv_bla_is_backbone_gw_orig(bat_priv
, resp_src
))
2660 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2664 spin_lock_bh(&orig_node
->tt_lock
);
2666 change_offset
= sizeof(struct batadv_tvlv_tt_vlan_data
);
2667 change_offset
*= ntohs(tt_data
->num_vlan
);
2668 change_offset
+= sizeof(*tt_data
);
2669 tvlv_ptr
+= change_offset
;
2671 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_ptr
;
2672 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
) {
2673 batadv_tt_fill_gtable(bat_priv
, tt_change
, tt_data
->ttvn
,
2674 resp_src
, num_entries
);
2676 batadv_tt_update_changes(bat_priv
, orig_node
, num_entries
,
2677 tt_data
->ttvn
, tt_change
);
2680 /* Recalculate the CRC for this orig_node and store it */
2681 batadv_tt_global_update_crc(bat_priv
, orig_node
);
2683 spin_unlock_bh(&orig_node
->tt_lock
);
2685 /* Delete the tt_req_node from pending tt_requests list */
2686 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2687 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2688 if (!batadv_compare_eth(node
->addr
, resp_src
))
2690 list_del(&node
->list
);
2694 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2697 batadv_orig_node_free_ref(orig_node
);
2700 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
2702 struct batadv_tt_roam_node
*node
, *safe
;
2704 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2706 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2707 list_del(&node
->list
);
2711 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2714 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
2716 struct batadv_tt_roam_node
*node
, *safe
;
2718 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2719 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2720 if (!batadv_has_timed_out(node
->first_time
,
2721 BATADV_ROAMING_MAX_TIME
))
2724 list_del(&node
->list
);
2727 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2730 /* This function checks whether the client already reached the
2731 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2734 * returns true if the ROAMING_ADV can be sent, false otherwise
2736 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
,
2739 struct batadv_tt_roam_node
*tt_roam_node
;
2742 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2743 /* The new tt_req will be issued only if I'm not waiting for a
2744 * reply from the same orig_node yet
2746 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
2747 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
2750 if (batadv_has_timed_out(tt_roam_node
->first_time
,
2751 BATADV_ROAMING_MAX_TIME
))
2754 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
2755 /* Sorry, you roamed too many times! */
2762 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
2766 tt_roam_node
->first_time
= jiffies
;
2767 atomic_set(&tt_roam_node
->counter
,
2768 BATADV_ROAMING_MAX_COUNT
- 1);
2769 memcpy(tt_roam_node
->addr
, client
, ETH_ALEN
);
2771 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
2776 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2781 * batadv_send_roam_adv - send a roaming advertisement message
2782 * @bat_priv: the bat priv with all the soft interface information
2783 * @client: mac address of the roaming client
2784 * @vid: VLAN identifier
2785 * @orig_node: message destination
2787 * Send a ROAMING_ADV message to the node which was previously serving this
2788 * client. This is done to inform the node that from now on all traffic destined
2789 * for this particular roamed client has to be forwarded to the sender of the
2792 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
2794 struct batadv_orig_node
*orig_node
)
2796 struct batadv_hard_iface
*primary_if
;
2797 struct batadv_tvlv_roam_adv tvlv_roam
;
2799 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2803 /* before going on we have to check whether the client has
2804 * already roamed to us too many times
2806 if (!batadv_tt_check_roam_count(bat_priv
, client
))
2809 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2810 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2811 orig_node
->orig
, client
, BATADV_PRINT_VID(vid
));
2813 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
2815 memcpy(tvlv_roam
.client
, client
, sizeof(tvlv_roam
.client
));
2816 tvlv_roam
.vid
= htons(vid
);
2818 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2819 orig_node
->orig
, BATADV_TVLV_ROAM
, 1,
2820 &tvlv_roam
, sizeof(tvlv_roam
));
2824 batadv_hardif_free_ref(primary_if
);
2827 static void batadv_tt_purge(struct work_struct
*work
)
2829 struct delayed_work
*delayed_work
;
2830 struct batadv_priv_tt
*priv_tt
;
2831 struct batadv_priv
*bat_priv
;
2833 delayed_work
= container_of(work
, struct delayed_work
, work
);
2834 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
2835 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
2837 batadv_tt_local_purge(bat_priv
);
2838 batadv_tt_global_purge(bat_priv
);
2839 batadv_tt_req_purge(bat_priv
);
2840 batadv_tt_roam_purge(bat_priv
);
2842 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
2843 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
2846 void batadv_tt_free(struct batadv_priv
*bat_priv
)
2848 batadv_tvlv_container_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
2849 batadv_tvlv_handler_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
2851 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
2853 batadv_tt_local_table_free(bat_priv
);
2854 batadv_tt_global_table_free(bat_priv
);
2855 batadv_tt_req_list_free(bat_priv
);
2856 batadv_tt_changes_list_free(bat_priv
);
2857 batadv_tt_roam_list_free(bat_priv
);
2859 kfree(bat_priv
->tt
.last_changeset
);
2863 * batadv_tt_local_set_flags - set or unset the specified flags on the local
2864 * table and possibly count them in the TT size
2865 * @bat_priv: the bat priv with all the soft interface information
2866 * @flags: the flag to switch
2867 * @enable: whether to set or unset the flag
2868 * @count: whether to increase the TT size by the number of changed entries
2870 static void batadv_tt_local_set_flags(struct batadv_priv
*bat_priv
,
2871 uint16_t flags
, bool enable
, bool count
)
2873 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2874 struct batadv_tt_common_entry
*tt_common_entry
;
2875 uint16_t changed_num
= 0;
2876 struct hlist_head
*head
;
2882 for (i
= 0; i
< hash
->size
; i
++) {
2883 head
= &hash
->table
[i
];
2886 hlist_for_each_entry_rcu(tt_common_entry
,
2889 if ((tt_common_entry
->flags
& flags
) == flags
)
2891 tt_common_entry
->flags
|= flags
;
2893 if (!(tt_common_entry
->flags
& flags
))
2895 tt_common_entry
->flags
&= ~flags
;
2902 batadv_tt_local_size_inc(bat_priv
,
2903 tt_common_entry
->vid
);
2909 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
2910 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
2912 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2913 struct batadv_tt_common_entry
*tt_common
;
2914 struct batadv_tt_local_entry
*tt_local
;
2915 struct hlist_node
*node_tmp
;
2916 struct hlist_head
*head
;
2917 spinlock_t
*list_lock
; /* protects write access to the hash lists */
2923 for (i
= 0; i
< hash
->size
; i
++) {
2924 head
= &hash
->table
[i
];
2925 list_lock
= &hash
->list_locks
[i
];
2927 spin_lock_bh(list_lock
);
2928 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
2930 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
2933 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2934 "Deleting local tt entry (%pM, vid: %d): pending\n",
2936 BATADV_PRINT_VID(tt_common
->vid
));
2938 batadv_tt_local_size_dec(bat_priv
, tt_common
->vid
);
2939 hlist_del_rcu(&tt_common
->hash_entry
);
2940 tt_local
= container_of(tt_common
,
2941 struct batadv_tt_local_entry
,
2943 batadv_tt_local_entry_free_ref(tt_local
);
2945 spin_unlock_bh(list_lock
);
2950 * batadv_tt_local_commit_changes - commit all pending local tt changes which
2951 * have been queued in the time since the last commit
2952 * @bat_priv: the bat priv with all the soft interface information
2954 void batadv_tt_local_commit_changes(struct batadv_priv
*bat_priv
)
2956 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2958 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1) {
2959 if (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))
2960 batadv_tt_tvlv_container_update(bat_priv
);
2964 batadv_tt_local_set_flags(bat_priv
, BATADV_TT_CLIENT_NEW
, false, true);
2966 batadv_tt_local_purge_pending_clients(bat_priv
);
2967 batadv_tt_local_update_crc(bat_priv
);
2969 /* Increment the TTVN only once per OGM interval */
2970 atomic_inc(&bat_priv
->tt
.vn
);
2971 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2972 "Local changes committed, updating to ttvn %u\n",
2973 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
2975 /* reset the sending counter */
2976 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
2977 batadv_tt_tvlv_container_update(bat_priv
);
2980 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2983 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, uint8_t *src
,
2984 uint8_t *dst
, unsigned short vid
)
2986 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
2987 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
2988 struct batadv_softif_vlan
*vlan
;
2991 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
2992 if (!vlan
|| !atomic_read(&vlan
->ap_isolation
))
2995 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
, vid
);
2996 if (!tt_local_entry
)
2999 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
, vid
);
3000 if (!tt_global_entry
)
3003 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
3010 batadv_softif_vlan_free_ref(vlan
);
3011 if (tt_global_entry
)
3012 batadv_tt_global_entry_free_ref(tt_global_entry
);
3014 batadv_tt_local_entry_free_ref(tt_local_entry
);
3019 * batadv_tt_update_orig - update global translation table with new tt
3020 * information received via ogms
3021 * @bat_priv: the bat priv with all the soft interface information
3022 * @orig: the orig_node of the ogm
3023 * @tt_vlan: pointer to the first tvlv VLAN entry
3024 * @tt_num_vlan: number of tvlv VLAN entries
3025 * @tt_change: pointer to the first entry in the TT buffer
3026 * @tt_num_changes: number of tt changes inside the tt buffer
3027 * @ttvn: translation table version number of this changeset
3028 * @tt_crc: crc32 checksum of orig node's translation table
3030 static void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
3031 struct batadv_orig_node
*orig_node
,
3032 const void *tt_buff
, uint16_t tt_num_vlan
,
3033 struct batadv_tvlv_tt_change
*tt_change
,
3034 uint16_t tt_num_changes
, uint8_t ttvn
)
3036 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
3037 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3038 bool full_table
= true;
3040 /* don't care about a backbone gateways updates. */
3041 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
3044 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)tt_buff
;
3045 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3046 * increased by one -> we can apply the attached changes
3048 if ((!orig_node
->tt_initialised
&& ttvn
== 1) ||
3049 ttvn
- orig_ttvn
== 1) {
3050 /* the OGM could not contain the changes due to their size or
3051 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3053 * In this case send a tt request
3055 if (!tt_num_changes
) {
3060 spin_lock_bh(&orig_node
->tt_lock
);
3062 tt_change
= (struct batadv_tvlv_tt_change
*)tt_buff
;
3063 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
3066 /* Even if we received the precomputed crc with the OGM, we
3067 * prefer to recompute it to spot any possible inconsistency
3068 * in the global table
3070 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3072 spin_unlock_bh(&orig_node
->tt_lock
);
3074 /* The ttvn alone is not enough to guarantee consistency
3075 * because a single value could represent different states
3076 * (due to the wrap around). Thus a node has to check whether
3077 * the resulting table (after applying the changes) is still
3078 * consistent or not. E.g. a node could disconnect while its
3079 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3080 * checking the CRC value is mandatory to detect the
3083 if (!batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3087 /* if we missed more than one change or our tables are not
3088 * in sync anymore -> request fresh tt data
3090 if (!orig_node
->tt_initialised
|| ttvn
!= orig_ttvn
||
3091 !batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3094 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3095 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3096 orig_node
->orig
, ttvn
, orig_ttvn
,
3098 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
3099 tt_vlan
, tt_num_vlan
,
3107 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3108 * @bat_priv: the bat priv with all the soft interface information
3109 * @addr: the mac address of the client to check
3110 * @vid: VLAN identifier
3112 * Returns true if we know that the client has moved from its old originator
3113 * to another one. This entry is still kept for consistency purposes and will be
3114 * deleted later by a DEL or because of timeout
3116 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
3117 uint8_t *addr
, unsigned short vid
)
3119 struct batadv_tt_global_entry
*tt_global_entry
;
3122 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3123 if (!tt_global_entry
)
3126 ret
= tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3127 batadv_tt_global_entry_free_ref(tt_global_entry
);
3133 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3134 * @bat_priv: the bat priv with all the soft interface information
3135 * @addr: the mac address of the local client to query
3136 * @vid: VLAN identifier
3138 * Returns true if the local client is known to be roaming (it is not served by
3139 * this node anymore) or not. If yes, the client is still present in the table
3140 * to keep the latter consistent with the node TTVN
3142 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
3143 uint8_t *addr
, unsigned short vid
)
3145 struct batadv_tt_local_entry
*tt_local_entry
;
3148 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3149 if (!tt_local_entry
)
3152 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3153 batadv_tt_local_entry_free_ref(tt_local_entry
);
3158 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
3159 struct batadv_orig_node
*orig_node
,
3160 const unsigned char *addr
,
3165 /* if the originator is a backbone node (meaning it belongs to the same
3166 * LAN of this node) the temporary client must not be added because to
3167 * reach such destination the node must use the LAN instead of the mesh
3169 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
))
3172 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
, vid
,
3173 BATADV_TT_CLIENT_TEMP
,
3174 atomic_read(&orig_node
->last_ttvn
)))
3177 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3178 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3179 addr
, BATADV_PRINT_VID(vid
), orig_node
->orig
);
3186 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3187 * @bat_priv: the bat priv with all the soft interface information
3188 * @orig: the orig_node of the ogm
3189 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3190 * @tvlv_value: tvlv buffer containing the gateway data
3191 * @tvlv_value_len: tvlv buffer length
3193 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv
*bat_priv
,
3194 struct batadv_orig_node
*orig
,
3195 uint8_t flags
, void *tvlv_value
,
3196 uint16_t tvlv_value_len
)
3198 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3199 struct batadv_tvlv_tt_change
*tt_change
;
3200 struct batadv_tvlv_tt_data
*tt_data
;
3201 uint16_t num_entries
, num_vlan
;
3203 if (tvlv_value_len
< sizeof(*tt_data
))
3206 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3207 tvlv_value_len
-= sizeof(*tt_data
);
3209 num_vlan
= ntohs(tt_data
->num_vlan
);
3211 if (tvlv_value_len
< sizeof(*tt_vlan
) * num_vlan
)
3214 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
3215 tt_change
= (struct batadv_tvlv_tt_change
*)(tt_vlan
+ num_vlan
);
3216 tvlv_value_len
-= sizeof(*tt_vlan
) * num_vlan
;
3218 num_entries
= batadv_tt_entries(tvlv_value_len
);
3220 batadv_tt_update_orig(bat_priv
, orig
, tt_vlan
, num_vlan
, tt_change
,
3221 num_entries
, tt_data
->ttvn
);
3225 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3227 * @bat_priv: the bat priv with all the soft interface information
3228 * @src: mac address of tt tvlv sender
3229 * @dst: mac address of tt tvlv recipient
3230 * @tvlv_value: tvlv buffer containing the tt data
3231 * @tvlv_value_len: tvlv buffer length
3233 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3236 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3237 uint8_t *src
, uint8_t *dst
,
3239 uint16_t tvlv_value_len
)
3241 struct batadv_tvlv_tt_data
*tt_data
;
3242 uint16_t tt_vlan_len
, tt_num_entries
;
3246 if (tvlv_value_len
< sizeof(*tt_data
))
3247 return NET_RX_SUCCESS
;
3249 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3250 tvlv_value_len
-= sizeof(*tt_data
);
3252 tt_vlan_len
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3253 tt_vlan_len
*= ntohs(tt_data
->num_vlan
);
3255 if (tvlv_value_len
< tt_vlan_len
)
3256 return NET_RX_SUCCESS
;
3258 tvlv_value_len
-= tt_vlan_len
;
3259 tt_num_entries
= batadv_tt_entries(tvlv_value_len
);
3261 switch (tt_data
->flags
& BATADV_TT_DATA_TYPE_MASK
) {
3262 case BATADV_TT_REQUEST
:
3263 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
3265 /* If this node cannot provide a TT response the tt_request is
3268 ret
= batadv_send_tt_response(bat_priv
, tt_data
, src
, dst
);
3270 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3275 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3276 "Routing TT_REQUEST to %pM [%c]\n",
3278 /* tvlv API will re-route the packet */
3282 case BATADV_TT_RESPONSE
:
3283 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
3285 if (batadv_is_my_mac(bat_priv
, dst
)) {
3286 batadv_handle_tt_response(bat_priv
, tt_data
,
3287 src
, tt_num_entries
);
3288 return NET_RX_SUCCESS
;
3291 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3296 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3297 "Routing TT_RESPONSE to %pM [%c]\n", dst
, tt_flag
);
3299 /* tvlv API will re-route the packet */
3303 return NET_RX_SUCCESS
;
3307 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3308 * @bat_priv: the bat priv with all the soft interface information
3309 * @src: mac address of tt tvlv sender
3310 * @dst: mac address of tt tvlv recipient
3311 * @tvlv_value: tvlv buffer containing the tt data
3312 * @tvlv_value_len: tvlv buffer length
3314 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3317 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3318 uint8_t *src
, uint8_t *dst
,
3320 uint16_t tvlv_value_len
)
3322 struct batadv_tvlv_roam_adv
*roaming_adv
;
3323 struct batadv_orig_node
*orig_node
= NULL
;
3325 /* If this node is not the intended recipient of the
3326 * roaming advertisement the packet is forwarded
3327 * (the tvlv API will re-route the packet).
3329 if (!batadv_is_my_mac(bat_priv
, dst
))
3332 /* check if it is a backbone gateway. we don't accept
3333 * roaming advertisement from it, as it has the same
3334 * entries as we have.
3336 if (batadv_bla_is_backbone_gw_orig(bat_priv
, src
))
3339 if (tvlv_value_len
< sizeof(*roaming_adv
))
3342 orig_node
= batadv_orig_hash_find(bat_priv
, src
);
3346 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
3347 roaming_adv
= (struct batadv_tvlv_roam_adv
*)tvlv_value
;
3349 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3350 "Received ROAMING_ADV from %pM (client %pM)\n",
3351 src
, roaming_adv
->client
);
3353 batadv_tt_global_add(bat_priv
, orig_node
, roaming_adv
->client
,
3354 ntohs(roaming_adv
->vid
), BATADV_TT_CLIENT_ROAM
,
3355 atomic_read(&orig_node
->last_ttvn
) + 1);
3359 batadv_orig_node_free_ref(orig_node
);
3360 return NET_RX_SUCCESS
;
3364 * batadv_tt_init - initialise the translation table internals
3365 * @bat_priv: the bat priv with all the soft interface information
3367 * Return 0 on success or negative error number in case of failure.
3369 int batadv_tt_init(struct batadv_priv
*bat_priv
)
3373 ret
= batadv_tt_local_init(bat_priv
);
3377 ret
= batadv_tt_global_init(bat_priv
);
3381 batadv_tvlv_handler_register(bat_priv
, batadv_tt_tvlv_ogm_handler_v1
,
3382 batadv_tt_tvlv_unicast_handler_v1
,
3383 BATADV_TVLV_TT
, 1, BATADV_NO_FLAGS
);
3385 batadv_tvlv_handler_register(bat_priv
, NULL
,
3386 batadv_roam_tvlv_unicast_handler_v1
,
3387 BATADV_TVLV_ROAM
, 1, BATADV_NO_FLAGS
);
3389 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
3390 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3391 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));