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
)
362 /* this is a second add in the same originator interval. It
363 * means that flags have been changed: update them!
365 if (!del_op_requested
&& !del_op_entry
)
366 entry
->change
.flags
= flags
;
370 list_del(&entry
->list
);
372 kfree(tt_change_node
);
373 event_removed
= true;
377 /* track the change in the OGMinterval list */
378 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
381 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
384 atomic_dec(&bat_priv
->tt
.local_changes
);
386 atomic_inc(&bat_priv
->tt
.local_changes
);
390 * batadv_tt_len - compute length in bytes of given number of tt changes
391 * @changes_num: number of tt changes
393 * Returns computed length in bytes.
395 static int batadv_tt_len(int changes_num
)
397 return changes_num
* sizeof(struct batadv_tvlv_tt_change
);
401 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
402 * @tt_len: available space
404 * Returns the number of entries.
406 static uint16_t batadv_tt_entries(uint16_t tt_len
)
408 return tt_len
/ batadv_tt_len(1);
412 * batadv_tt_local_table_transmit_size - calculates the local translation table
413 * size when transmitted over the air
414 * @bat_priv: the bat priv with all the soft interface information
416 * Returns local translation table size in bytes.
418 static int batadv_tt_local_table_transmit_size(struct batadv_priv
*bat_priv
)
420 uint16_t num_vlan
= 0, tt_local_entries
= 0;
421 struct batadv_softif_vlan
*vlan
;
425 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
427 tt_local_entries
+= atomic_read(&vlan
->tt
.num_entries
);
431 /* header size of tvlv encapsulated tt response payload */
432 hdr_size
= sizeof(struct batadv_unicast_tvlv_packet
);
433 hdr_size
+= sizeof(struct batadv_tvlv_hdr
);
434 hdr_size
+= sizeof(struct batadv_tvlv_tt_data
);
435 hdr_size
+= num_vlan
* sizeof(struct batadv_tvlv_tt_vlan_data
);
437 return hdr_size
+ batadv_tt_len(tt_local_entries
);
440 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
442 if (bat_priv
->tt
.local_hash
)
445 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
447 if (!bat_priv
->tt
.local_hash
)
450 batadv_hash_set_lock_class(bat_priv
->tt
.local_hash
,
451 &batadv_tt_local_hash_lock_class_key
);
456 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
457 struct batadv_tt_global_entry
*tt_global
,
460 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
461 "Deleting global tt entry %pM (vid: %d): %s\n",
462 tt_global
->common
.addr
,
463 BATADV_PRINT_VID(tt_global
->common
.vid
), message
);
465 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
466 batadv_choose_tt
, &tt_global
->common
);
467 batadv_tt_global_entry_free_ref(tt_global
);
471 * batadv_tt_local_add - add a new client to the local table or update an
473 * @soft_iface: netdev struct of the mesh interface
474 * @addr: the mac address of the client to add
475 * @vid: VLAN identifier
476 * @ifindex: index of the interface where the client is connected to (useful to
477 * identify wireless clients)
479 * Returns true if the client was successfully added, false otherwise.
481 bool batadv_tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
482 unsigned short vid
, int ifindex
)
484 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
485 struct batadv_tt_local_entry
*tt_local
;
486 struct batadv_tt_global_entry
*tt_global
;
487 struct net_device
*in_dev
= NULL
;
488 struct hlist_head
*head
;
489 struct batadv_tt_orig_list_entry
*orig_entry
;
490 int hash_added
, table_size
, packet_size_max
;
491 bool ret
= false, roamed_back
= false;
492 uint8_t remote_flags
;
494 if (ifindex
!= BATADV_NULL_IFINDEX
)
495 in_dev
= dev_get_by_index(&init_net
, ifindex
);
497 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
498 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
501 tt_local
->last_seen
= jiffies
;
502 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
503 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
504 "Re-adding pending client %pM (vid: %d)\n",
505 addr
, BATADV_PRINT_VID(vid
));
506 /* whatever the reason why the PENDING flag was set,
507 * this is a client which was enqueued to be removed in
508 * this orig_interval. Since it popped up again, the
509 * flag can be reset like it was never enqueued
511 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
515 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
516 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
517 "Roaming client %pM (vid: %d) came back to its original location\n",
518 addr
, BATADV_PRINT_VID(vid
));
519 /* the ROAM flag is set because this client roamed away
520 * and the node got a roaming_advertisement message. Now
521 * that the client popped up again at its original
522 * location such flag can be unset
524 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
530 /* Ignore the client if we cannot send it in a full table response. */
531 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
532 table_size
+= batadv_tt_len(1);
533 packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
534 if (table_size
> packet_size_max
) {
535 net_ratelimited_function(batadv_info
, soft_iface
,
536 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
537 table_size
, packet_size_max
, addr
);
541 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
545 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
546 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
547 addr
, BATADV_PRINT_VID(vid
),
548 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
550 memcpy(tt_local
->common
.addr
, addr
, ETH_ALEN
);
551 /* The local entry has to be marked as NEW to avoid to send it in
552 * a full table response going out before the next ttvn increment
553 * (consistency check)
555 tt_local
->common
.flags
= BATADV_TT_CLIENT_NEW
;
556 tt_local
->common
.vid
= vid
;
557 if (batadv_is_wifi_netdev(in_dev
))
558 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
559 atomic_set(&tt_local
->common
.refcount
, 2);
560 tt_local
->last_seen
= jiffies
;
561 tt_local
->common
.added_at
= tt_local
->last_seen
;
563 /* the batman interface mac address should never be purged */
564 if (batadv_compare_eth(addr
, soft_iface
->dev_addr
))
565 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NOPURGE
;
567 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
568 batadv_choose_tt
, &tt_local
->common
,
569 &tt_local
->common
.hash_entry
);
571 if (unlikely(hash_added
!= 0)) {
572 /* remove the reference for the hash */
573 batadv_tt_local_entry_free_ref(tt_local
);
578 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
581 /* Check whether it is a roaming, but don't do anything if the roaming
582 * process has already been handled
584 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
585 /* These node are probably going to update their tt table */
586 head
= &tt_global
->orig_list
;
588 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
589 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
590 tt_global
->common
.vid
,
591 orig_entry
->orig_node
);
595 batadv_tt_global_free(bat_priv
, tt_global
,
599 /* The global entry has to be marked as ROAMING and
600 * has to be kept for consistency purpose
602 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
603 tt_global
->roam_at
= jiffies
;
607 /* store the current remote flags before altering them. This helps
608 * understanding is flags are changing or not
610 remote_flags
= tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
;
612 if (batadv_is_wifi_netdev(in_dev
))
613 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
615 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_WIFI
;
617 /* if any "dynamic" flag has been modified, resend an ADD event for this
618 * entry so that all the nodes can get the new flags
620 if (remote_flags
^ (tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
))
621 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
628 batadv_tt_local_entry_free_ref(tt_local
);
630 batadv_tt_global_entry_free_ref(tt_global
);
635 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
636 * within a TT Response directed to another node
637 * @orig_node: originator for which the TT data has to be prepared
638 * @tt_data: uninitialised pointer to the address of the TVLV buffer
639 * @tt_change: uninitialised pointer to the address of the area where the TT
640 * changed can be stored
641 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
642 * function reserves the amount of space needed to send the entire global TT
643 * table. In case of success the value is updated with the real amount of
646 * Allocate the needed amount of memory for the entire TT TVLV and write its
647 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
648 * objects, one per active VLAN served by the originator node.
650 * Return the size of the allocated buffer or 0 in case of failure.
653 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node
*orig_node
,
654 struct batadv_tvlv_tt_data
**tt_data
,
655 struct batadv_tvlv_tt_change
**tt_change
,
658 uint16_t num_vlan
= 0, num_entries
= 0, change_offset
, tvlv_len
;
659 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
660 struct batadv_orig_node_vlan
*vlan
;
661 uint8_t *tt_change_ptr
;
664 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
666 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
669 change_offset
= sizeof(**tt_data
);
670 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
672 /* if tt_len is negative, allocate the space needed by the full table */
674 *tt_len
= batadv_tt_len(num_entries
);
677 tvlv_len
+= change_offset
;
679 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
685 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
686 (*tt_data
)->ttvn
= atomic_read(&orig_node
->last_ttvn
);
687 (*tt_data
)->num_vlan
= htons(num_vlan
);
689 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
690 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
691 tt_vlan
->vid
= htons(vlan
->vid
);
692 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
697 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
698 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
706 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
708 * @bat_priv: the bat priv with all the soft interface information
709 * @tt_data: uninitialised pointer to the address of the TVLV buffer
710 * @tt_change: uninitialised pointer to the address of the area where the TT
711 * changes can be stored
712 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
713 * function reserves the amount of space needed to send the entire local TT
714 * table. In case of success the value is updated with the real amount of
717 * Allocate the needed amount of memory for the entire TT TVLV and write its
718 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
719 * objects, one per active VLAN.
721 * Return the size of the allocated buffer or 0 in case of failure.
724 batadv_tt_prepare_tvlv_local_data(struct batadv_priv
*bat_priv
,
725 struct batadv_tvlv_tt_data
**tt_data
,
726 struct batadv_tvlv_tt_change
**tt_change
,
729 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
730 struct batadv_softif_vlan
*vlan
;
731 uint16_t num_vlan
= 0, num_entries
= 0, tvlv_len
;
732 uint8_t *tt_change_ptr
;
736 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
738 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
741 change_offset
= sizeof(**tt_data
);
742 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
744 /* if tt_len is negative, allocate the space needed by the full table */
746 *tt_len
= batadv_tt_len(num_entries
);
749 tvlv_len
+= change_offset
;
751 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
757 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
758 (*tt_data
)->ttvn
= atomic_read(&bat_priv
->tt
.vn
);
759 (*tt_data
)->num_vlan
= htons(num_vlan
);
761 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
762 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
763 tt_vlan
->vid
= htons(vlan
->vid
);
764 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
769 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
770 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
778 * batadv_tt_tvlv_container_update - update the translation table tvlv container
779 * after local tt changes have been committed
780 * @bat_priv: the bat priv with all the soft interface information
782 static void batadv_tt_tvlv_container_update(struct batadv_priv
*bat_priv
)
784 struct batadv_tt_change_node
*entry
, *safe
;
785 struct batadv_tvlv_tt_data
*tt_data
;
786 struct batadv_tvlv_tt_change
*tt_change
;
787 int tt_diff_len
, tt_change_len
= 0;
788 int tt_diff_entries_num
= 0, tt_diff_entries_count
= 0;
791 tt_diff_entries_num
= atomic_read(&bat_priv
->tt
.local_changes
);
792 tt_diff_len
= batadv_tt_len(tt_diff_entries_num
);
794 /* if we have too many changes for one packet don't send any
795 * and wait for the tt table request which will be fragmented
797 if (tt_diff_len
> bat_priv
->soft_iface
->mtu
)
800 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
, &tt_data
,
801 &tt_change
, &tt_diff_len
);
805 tt_data
->flags
= BATADV_TT_OGM_DIFF
;
807 if (tt_diff_len
== 0)
808 goto container_register
;
810 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
811 atomic_set(&bat_priv
->tt
.local_changes
, 0);
813 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
815 if (tt_diff_entries_count
< tt_diff_entries_num
) {
816 memcpy(tt_change
+ tt_diff_entries_count
,
818 sizeof(struct batadv_tvlv_tt_change
));
819 tt_diff_entries_count
++;
821 list_del(&entry
->list
);
824 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
826 /* Keep the buffer for possible tt_request */
827 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
828 kfree(bat_priv
->tt
.last_changeset
);
829 bat_priv
->tt
.last_changeset_len
= 0;
830 bat_priv
->tt
.last_changeset
= NULL
;
831 tt_change_len
= batadv_tt_len(tt_diff_entries_count
);
832 /* check whether this new OGM has no changes due to size problems */
833 if (tt_diff_entries_count
> 0) {
834 /* if kmalloc() fails we will reply with the full table
835 * instead of providing the diff
837 bat_priv
->tt
.last_changeset
= kzalloc(tt_diff_len
, GFP_ATOMIC
);
838 if (bat_priv
->tt
.last_changeset
) {
839 memcpy(bat_priv
->tt
.last_changeset
,
840 tt_change
, tt_change_len
);
841 bat_priv
->tt
.last_changeset_len
= tt_diff_len
;
844 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
847 batadv_tvlv_container_register(bat_priv
, BATADV_TVLV_TT
, 1, tt_data
,
852 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
854 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
855 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
856 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
857 struct batadv_tt_common_entry
*tt_common_entry
;
858 struct batadv_tt_local_entry
*tt_local
;
859 struct batadv_hard_iface
*primary_if
;
860 struct batadv_softif_vlan
*vlan
;
861 struct hlist_head
*head
;
866 unsigned long last_seen_jiffies
;
868 uint16_t np_flag
= BATADV_TT_CLIENT_NOPURGE
;
870 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
875 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
876 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
877 seq_printf(seq
, " %-13s %s %-7s %-9s (%-10s)\n", "Client", "VID",
878 "Flags", "Last seen", "CRC");
880 for (i
= 0; i
< hash
->size
; i
++) {
881 head
= &hash
->table
[i
];
884 hlist_for_each_entry_rcu(tt_common_entry
,
886 tt_local
= container_of(tt_common_entry
,
887 struct batadv_tt_local_entry
,
889 vid
= tt_common_entry
->vid
;
890 last_seen_jiffies
= jiffies
- tt_local
->last_seen
;
891 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
892 last_seen_secs
= last_seen_msecs
/ 1000;
893 last_seen_msecs
= last_seen_msecs
% 1000;
895 no_purge
= tt_common_entry
->flags
& np_flag
;
897 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
899 seq_printf(seq
, "Cannot retrieve VLAN %d\n",
900 BATADV_PRINT_VID(vid
));
905 " * %pM %4i [%c%c%c%c%c] %3u.%03u (%#.8x)\n",
906 tt_common_entry
->addr
,
907 BATADV_PRINT_VID(tt_common_entry
->vid
),
908 (tt_common_entry
->flags
&
909 BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
910 no_purge
? 'P' : '.',
911 (tt_common_entry
->flags
&
912 BATADV_TT_CLIENT_NEW
? 'N' : '.'),
913 (tt_common_entry
->flags
&
914 BATADV_TT_CLIENT_PENDING
? 'X' : '.'),
915 (tt_common_entry
->flags
&
916 BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
917 no_purge
? 0 : last_seen_secs
,
918 no_purge
? 0 : last_seen_msecs
,
921 batadv_softif_vlan_free_ref(vlan
);
927 batadv_hardif_free_ref(primary_if
);
932 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
933 struct batadv_tt_local_entry
*tt_local_entry
,
934 uint16_t flags
, const char *message
)
936 batadv_tt_local_event(bat_priv
, tt_local_entry
, flags
);
938 /* The local client has to be marked as "pending to be removed" but has
939 * to be kept in the table in order to send it in a full table
940 * response issued before the net ttvn increment (consistency check)
942 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
944 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
945 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
946 tt_local_entry
->common
.addr
,
947 BATADV_PRINT_VID(tt_local_entry
->common
.vid
), message
);
951 * batadv_tt_local_remove - logically remove an entry from the local table
952 * @bat_priv: the bat priv with all the soft interface information
953 * @addr: the MAC address of the client to remove
954 * @vid: VLAN identifier
955 * @message: message to append to the log on deletion
956 * @roaming: true if the deletion is due to a roaming event
958 * Returns the flags assigned to the local entry before being deleted
960 uint16_t batadv_tt_local_remove(struct batadv_priv
*bat_priv
,
961 const uint8_t *addr
, unsigned short vid
,
962 const char *message
, bool roaming
)
964 struct batadv_tt_local_entry
*tt_local_entry
;
965 uint16_t flags
, curr_flags
= BATADV_NO_FLAGS
;
967 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
971 curr_flags
= tt_local_entry
->common
.flags
;
973 flags
= BATADV_TT_CLIENT_DEL
;
974 /* if this global entry addition is due to a roaming, the node has to
975 * mark the local entry as "roamed" in order to correctly reroute
979 flags
|= BATADV_TT_CLIENT_ROAM
;
980 /* mark the local client as ROAMed */
981 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
984 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
985 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
989 /* if this client has been added right now, it is possible to
990 * immediately purge it
992 batadv_tt_local_event(bat_priv
, tt_local_entry
, BATADV_TT_CLIENT_DEL
);
993 hlist_del_rcu(&tt_local_entry
->common
.hash_entry
);
994 batadv_tt_local_entry_free_ref(tt_local_entry
);
998 batadv_tt_local_entry_free_ref(tt_local_entry
);
1004 * batadv_tt_local_purge_list - purge inactive tt local entries
1005 * @bat_priv: the bat priv with all the soft interface information
1006 * @head: pointer to the list containing the local tt entries
1007 * @timeout: parameter deciding whether a given tt local entry is considered
1010 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
1011 struct hlist_head
*head
,
1014 struct batadv_tt_local_entry
*tt_local_entry
;
1015 struct batadv_tt_common_entry
*tt_common_entry
;
1016 struct hlist_node
*node_tmp
;
1018 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
, head
,
1020 tt_local_entry
= container_of(tt_common_entry
,
1021 struct batadv_tt_local_entry
,
1023 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
1026 /* entry already marked for deletion */
1027 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
1030 if (!batadv_has_timed_out(tt_local_entry
->last_seen
, timeout
))
1033 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
1034 BATADV_TT_CLIENT_DEL
, "timed out");
1039 * batadv_tt_local_purge - purge inactive tt local entries
1040 * @bat_priv: the bat priv with all the soft interface information
1041 * @timeout: parameter deciding whether a given tt local entry is considered
1044 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
,
1047 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1048 struct hlist_head
*head
;
1049 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1052 for (i
= 0; i
< hash
->size
; i
++) {
1053 head
= &hash
->table
[i
];
1054 list_lock
= &hash
->list_locks
[i
];
1056 spin_lock_bh(list_lock
);
1057 batadv_tt_local_purge_list(bat_priv
, head
, timeout
);
1058 spin_unlock_bh(list_lock
);
1062 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
1064 struct batadv_hashtable
*hash
;
1065 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1066 struct batadv_tt_common_entry
*tt_common_entry
;
1067 struct batadv_tt_local_entry
*tt_local
;
1068 struct hlist_node
*node_tmp
;
1069 struct hlist_head
*head
;
1072 if (!bat_priv
->tt
.local_hash
)
1075 hash
= bat_priv
->tt
.local_hash
;
1077 for (i
= 0; i
< hash
->size
; i
++) {
1078 head
= &hash
->table
[i
];
1079 list_lock
= &hash
->list_locks
[i
];
1081 spin_lock_bh(list_lock
);
1082 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1084 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1085 tt_local
= container_of(tt_common_entry
,
1086 struct batadv_tt_local_entry
,
1088 batadv_tt_local_entry_free_ref(tt_local
);
1090 spin_unlock_bh(list_lock
);
1093 batadv_hash_destroy(hash
);
1095 bat_priv
->tt
.local_hash
= NULL
;
1098 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
1100 if (bat_priv
->tt
.global_hash
)
1103 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
1105 if (!bat_priv
->tt
.global_hash
)
1108 batadv_hash_set_lock_class(bat_priv
->tt
.global_hash
,
1109 &batadv_tt_global_hash_lock_class_key
);
1114 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
1116 struct batadv_tt_change_node
*entry
, *safe
;
1118 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
1120 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
1122 list_del(&entry
->list
);
1126 atomic_set(&bat_priv
->tt
.local_changes
, 0);
1127 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
1130 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1131 * batadv_tt_global_entry list
1133 * returns it with an increased refcounter, NULL if not found
1135 static struct batadv_tt_orig_list_entry
*
1136 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
1137 const struct batadv_orig_node
*orig_node
)
1139 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
1140 const struct hlist_head
*head
;
1143 head
= &entry
->orig_list
;
1144 hlist_for_each_entry_rcu(tmp_orig_entry
, head
, list
) {
1145 if (tmp_orig_entry
->orig_node
!= orig_node
)
1147 if (!atomic_inc_not_zero(&tmp_orig_entry
->refcount
))
1150 orig_entry
= tmp_orig_entry
;
1158 /* find out if an orig_node is already in the list of a tt_global_entry.
1159 * returns true if found, false otherwise
1162 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
1163 const struct batadv_orig_node
*orig_node
)
1165 struct batadv_tt_orig_list_entry
*orig_entry
;
1168 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
1171 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1178 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
1179 struct batadv_orig_node
*orig_node
, int ttvn
)
1181 struct batadv_tt_orig_list_entry
*orig_entry
;
1183 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
1185 /* refresh the ttvn: the current value could be a bogus one that
1186 * was added during a "temporary client detection"
1188 orig_entry
->ttvn
= ttvn
;
1192 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
1196 INIT_HLIST_NODE(&orig_entry
->list
);
1197 atomic_inc(&orig_node
->refcount
);
1198 batadv_tt_global_size_inc(orig_node
, tt_global
->common
.vid
);
1199 orig_entry
->orig_node
= orig_node
;
1200 orig_entry
->ttvn
= ttvn
;
1201 atomic_set(&orig_entry
->refcount
, 2);
1203 spin_lock_bh(&tt_global
->list_lock
);
1204 hlist_add_head_rcu(&orig_entry
->list
,
1205 &tt_global
->orig_list
);
1206 spin_unlock_bh(&tt_global
->list_lock
);
1209 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1213 * batadv_tt_global_add - add a new TT global entry or update an existing one
1214 * @bat_priv: the bat priv with all the soft interface information
1215 * @orig_node: the originator announcing the client
1216 * @tt_addr: the mac address of the non-mesh client
1217 * @vid: VLAN identifier
1218 * @flags: TT flags that have to be set for this non-mesh client
1219 * @ttvn: the tt version number ever announcing this non-mesh client
1221 * Add a new TT global entry for the given originator. If the entry already
1222 * exists add a new reference to the given originator (a global entry can have
1223 * references to multiple originators) and adjust the flags attribute to reflect
1224 * the function argument.
1225 * If a TT local entry exists for this non-mesh client remove it.
1227 * The caller must hold orig_node refcount.
1229 * Return true if the new entry has been added, false otherwise
1231 static bool batadv_tt_global_add(struct batadv_priv
*bat_priv
,
1232 struct batadv_orig_node
*orig_node
,
1233 const unsigned char *tt_addr
,
1234 unsigned short vid
, uint16_t flags
,
1237 struct batadv_tt_global_entry
*tt_global_entry
;
1238 struct batadv_tt_local_entry
*tt_local_entry
;
1241 struct batadv_tt_common_entry
*common
;
1242 uint16_t local_flags
;
1244 /* ignore global entries from backbone nodes */
1245 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
, vid
))
1248 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
, vid
);
1249 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
, vid
);
1251 /* if the node already has a local client for this entry, it has to wait
1252 * for a roaming advertisement instead of manually messing up the global
1255 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
1256 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
1259 if (!tt_global_entry
) {
1260 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
1261 if (!tt_global_entry
)
1264 common
= &tt_global_entry
->common
;
1265 memcpy(common
->addr
, tt_addr
, ETH_ALEN
);
1268 common
->flags
= flags
;
1269 tt_global_entry
->roam_at
= 0;
1270 /* node must store current time in case of roaming. This is
1271 * needed to purge this entry out on timeout (if nobody claims
1274 if (flags
& BATADV_TT_CLIENT_ROAM
)
1275 tt_global_entry
->roam_at
= jiffies
;
1276 atomic_set(&common
->refcount
, 2);
1277 common
->added_at
= jiffies
;
1279 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
1280 spin_lock_init(&tt_global_entry
->list_lock
);
1282 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
1284 batadv_choose_tt
, common
,
1285 &common
->hash_entry
);
1287 if (unlikely(hash_added
!= 0)) {
1288 /* remove the reference for the hash */
1289 batadv_tt_global_entry_free_ref(tt_global_entry
);
1293 common
= &tt_global_entry
->common
;
1294 /* If there is already a global entry, we can use this one for
1296 * But if we are trying to add a temporary client then here are
1297 * two options at this point:
1298 * 1) the global client is not a temporary client: the global
1299 * client has to be left as it is, temporary information
1300 * should never override any already known client state
1301 * 2) the global client is a temporary client: purge the
1302 * originator list and add the new one orig_entry
1304 if (flags
& BATADV_TT_CLIENT_TEMP
) {
1305 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
1307 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
1310 batadv_tt_global_del_orig_list(tt_global_entry
);
1311 goto add_orig_entry
;
1314 /* if the client was temporary added before receiving the first
1315 * OGM announcing it, we have to clear the TEMP flag
1317 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
1319 /* the change can carry possible "attribute" flags like the
1320 * TT_CLIENT_WIFI, therefore they have to be copied in the
1323 tt_global_entry
->common
.flags
|= flags
;
1325 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1326 * one originator left in the list and we previously received a
1327 * delete + roaming change for this originator.
1329 * We should first delete the old originator before adding the
1332 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
1333 batadv_tt_global_del_orig_list(tt_global_entry
);
1334 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
1335 tt_global_entry
->roam_at
= 0;
1339 /* add the new orig_entry (if needed) or update it */
1340 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
1342 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1343 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1344 common
->addr
, BATADV_PRINT_VID(common
->vid
),
1350 /* remove address from local hash if present */
1351 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
, vid
,
1352 "global tt received",
1353 flags
& BATADV_TT_CLIENT_ROAM
);
1354 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
1356 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
1357 /* this is a normal global add. Therefore the client is not in a
1358 * roaming state anymore.
1360 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
1363 if (tt_global_entry
)
1364 batadv_tt_global_entry_free_ref(tt_global_entry
);
1366 batadv_tt_local_entry_free_ref(tt_local_entry
);
1370 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
1371 * @bat_priv: the bat priv with all the soft interface information
1372 * @tt_global_entry: global translation table entry to be analyzed
1374 * This functon assumes the caller holds rcu_read_lock().
1375 * Returns best originator list entry or NULL on errors.
1377 static struct batadv_tt_orig_list_entry
*
1378 batadv_transtable_best_orig(struct batadv_priv
*bat_priv
,
1379 struct batadv_tt_global_entry
*tt_global_entry
)
1381 struct batadv_neigh_node
*router
, *best_router
= NULL
;
1382 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
1383 struct hlist_head
*head
;
1384 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
1386 head
= &tt_global_entry
->orig_list
;
1387 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1388 router
= batadv_orig_node_get_router(orig_entry
->orig_node
);
1393 bao
->bat_neigh_cmp(router
, best_router
) <= 0) {
1394 batadv_neigh_node_free_ref(router
);
1398 /* release the refcount for the "old" best */
1400 batadv_neigh_node_free_ref(best_router
);
1402 best_entry
= orig_entry
;
1403 best_router
= router
;
1407 batadv_neigh_node_free_ref(best_router
);
1412 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1413 * for this global entry
1414 * @bat_priv: the bat priv with all the soft interface information
1415 * @tt_global_entry: global translation table entry to be printed
1416 * @seq: debugfs table seq_file struct
1418 * This functon assumes the caller holds rcu_read_lock().
1421 batadv_tt_global_print_entry(struct batadv_priv
*bat_priv
,
1422 struct batadv_tt_global_entry
*tt_global_entry
,
1423 struct seq_file
*seq
)
1425 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
1426 struct batadv_tt_common_entry
*tt_common_entry
;
1427 struct batadv_orig_node_vlan
*vlan
;
1428 struct hlist_head
*head
;
1432 tt_common_entry
= &tt_global_entry
->common
;
1433 flags
= tt_common_entry
->flags
;
1435 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1437 vlan
= batadv_orig_node_vlan_get(best_entry
->orig_node
,
1438 tt_common_entry
->vid
);
1441 " * Cannot retrieve VLAN %d for originator %pM\n",
1442 BATADV_PRINT_VID(tt_common_entry
->vid
),
1443 best_entry
->orig_node
->orig
);
1447 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
1449 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n",
1450 '*', tt_global_entry
->common
.addr
,
1451 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1452 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
1453 last_ttvn
, vlan
->tt
.crc
,
1454 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1455 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1456 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1458 batadv_orig_node_vlan_free_ref(vlan
);
1462 head
= &tt_global_entry
->orig_list
;
1464 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1465 if (best_entry
== orig_entry
)
1468 vlan
= batadv_orig_node_vlan_get(orig_entry
->orig_node
,
1469 tt_common_entry
->vid
);
1472 " + Cannot retrieve VLAN %d for originator %pM\n",
1473 BATADV_PRINT_VID(tt_common_entry
->vid
),
1474 orig_entry
->orig_node
->orig
);
1478 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
1480 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n",
1481 '+', tt_global_entry
->common
.addr
,
1482 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1483 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1484 last_ttvn
, vlan
->tt
.crc
,
1485 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1486 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1487 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1489 batadv_orig_node_vlan_free_ref(vlan
);
1493 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1495 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1496 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1497 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1498 struct batadv_tt_common_entry
*tt_common_entry
;
1499 struct batadv_tt_global_entry
*tt_global
;
1500 struct batadv_hard_iface
*primary_if
;
1501 struct hlist_head
*head
;
1504 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1509 "Globally announced TT entries received via the mesh %s\n",
1511 seq_printf(seq
, " %-13s %s %s %-15s %s (%-10s) %s\n",
1512 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1515 for (i
= 0; i
< hash
->size
; i
++) {
1516 head
= &hash
->table
[i
];
1519 hlist_for_each_entry_rcu(tt_common_entry
,
1521 tt_global
= container_of(tt_common_entry
,
1522 struct batadv_tt_global_entry
,
1524 batadv_tt_global_print_entry(bat_priv
, tt_global
, seq
);
1530 batadv_hardif_free_ref(primary_if
);
1534 /* deletes the orig list of a tt_global_entry */
1536 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1538 struct hlist_head
*head
;
1539 struct hlist_node
*safe
;
1540 struct batadv_tt_orig_list_entry
*orig_entry
;
1542 spin_lock_bh(&tt_global_entry
->list_lock
);
1543 head
= &tt_global_entry
->orig_list
;
1544 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1545 hlist_del_rcu(&orig_entry
->list
);
1546 batadv_tt_global_size_dec(orig_entry
->orig_node
,
1547 tt_global_entry
->common
.vid
);
1548 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1550 spin_unlock_bh(&tt_global_entry
->list_lock
);
1554 batadv_tt_global_del_orig_entry(struct batadv_priv
*bat_priv
,
1555 struct batadv_tt_global_entry
*tt_global_entry
,
1556 struct batadv_orig_node
*orig_node
,
1557 const char *message
)
1559 struct hlist_head
*head
;
1560 struct hlist_node
*safe
;
1561 struct batadv_tt_orig_list_entry
*orig_entry
;
1564 spin_lock_bh(&tt_global_entry
->list_lock
);
1565 head
= &tt_global_entry
->orig_list
;
1566 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1567 if (orig_entry
->orig_node
== orig_node
) {
1568 vid
= tt_global_entry
->common
.vid
;
1569 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1570 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1572 tt_global_entry
->common
.addr
,
1573 BATADV_PRINT_VID(vid
), message
);
1574 hlist_del_rcu(&orig_entry
->list
);
1575 batadv_tt_global_size_dec(orig_node
,
1576 tt_global_entry
->common
.vid
);
1577 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1580 spin_unlock_bh(&tt_global_entry
->list_lock
);
1583 /* If the client is to be deleted, we check if it is the last origantor entry
1584 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1585 * timer, otherwise we simply remove the originator scheduled for deletion.
1588 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1589 struct batadv_tt_global_entry
*tt_global_entry
,
1590 struct batadv_orig_node
*orig_node
,
1591 const char *message
)
1593 bool last_entry
= true;
1594 struct hlist_head
*head
;
1595 struct batadv_tt_orig_list_entry
*orig_entry
;
1597 /* no local entry exists, case 1:
1598 * Check if this is the last one or if other entries exist.
1602 head
= &tt_global_entry
->orig_list
;
1603 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1604 if (orig_entry
->orig_node
!= orig_node
) {
1612 /* its the last one, mark for roaming. */
1613 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1614 tt_global_entry
->roam_at
= jiffies
;
1616 /* there is another entry, we can simply delete this
1617 * one and can still use the other one.
1619 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1620 orig_node
, message
);
1624 * batadv_tt_global_del - remove a client from the global table
1625 * @bat_priv: the bat priv with all the soft interface information
1626 * @orig_node: an originator serving this client
1627 * @addr: the mac address of the client
1628 * @vid: VLAN identifier
1629 * @message: a message explaining the reason for deleting the client to print
1630 * for debugging purpose
1631 * @roaming: true if the deletion has been triggered by a roaming event
1633 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1634 struct batadv_orig_node
*orig_node
,
1635 const unsigned char *addr
, unsigned short vid
,
1636 const char *message
, bool roaming
)
1638 struct batadv_tt_global_entry
*tt_global_entry
;
1639 struct batadv_tt_local_entry
*local_entry
= NULL
;
1641 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1642 if (!tt_global_entry
)
1646 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1647 orig_node
, message
);
1649 if (hlist_empty(&tt_global_entry
->orig_list
))
1650 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1656 /* if we are deleting a global entry due to a roam
1657 * event, there are two possibilities:
1658 * 1) the client roamed from node A to node B => if there
1659 * is only one originator left for this client, we mark
1660 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1661 * wait for node B to claim it. In case of timeout
1662 * the entry is purged.
1664 * If there are other originators left, we directly delete
1666 * 2) the client roamed to us => we can directly delete
1667 * the global entry, since it is useless now.
1669 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1670 tt_global_entry
->common
.addr
,
1673 /* local entry exists, case 2: client roamed to us. */
1674 batadv_tt_global_del_orig_list(tt_global_entry
);
1675 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1677 /* no local entry exists, case 1: check for roaming */
1678 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1679 orig_node
, message
);
1683 if (tt_global_entry
)
1684 batadv_tt_global_entry_free_ref(tt_global_entry
);
1686 batadv_tt_local_entry_free_ref(local_entry
);
1690 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1691 * given originator matching the provided vid
1692 * @bat_priv: the bat priv with all the soft interface information
1693 * @orig_node: the originator owning the entries to remove
1694 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1696 * @message: debug message to print as "reason"
1698 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1699 struct batadv_orig_node
*orig_node
,
1701 const char *message
)
1703 struct batadv_tt_global_entry
*tt_global
;
1704 struct batadv_tt_common_entry
*tt_common_entry
;
1706 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1707 struct hlist_node
*safe
;
1708 struct hlist_head
*head
;
1709 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1715 for (i
= 0; i
< hash
->size
; i
++) {
1716 head
= &hash
->table
[i
];
1717 list_lock
= &hash
->list_locks
[i
];
1719 spin_lock_bh(list_lock
);
1720 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1722 /* remove only matching entries */
1723 if (match_vid
>= 0 && tt_common_entry
->vid
!= match_vid
)
1726 tt_global
= container_of(tt_common_entry
,
1727 struct batadv_tt_global_entry
,
1730 batadv_tt_global_del_orig_entry(bat_priv
, tt_global
,
1731 orig_node
, message
);
1733 if (hlist_empty(&tt_global
->orig_list
)) {
1734 vid
= tt_global
->common
.vid
;
1735 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1736 "Deleting global tt entry %pM (vid: %d): %s\n",
1737 tt_global
->common
.addr
,
1738 BATADV_PRINT_VID(vid
), message
);
1739 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1740 batadv_tt_global_entry_free_ref(tt_global
);
1743 spin_unlock_bh(list_lock
);
1745 orig_node
->tt_initialised
= false;
1748 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1752 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1753 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1755 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1756 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1758 *msg
= "Roaming timeout\n";
1761 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1762 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1764 *msg
= "Temporary client timeout\n";
1770 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1772 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1773 struct hlist_head
*head
;
1774 struct hlist_node
*node_tmp
;
1775 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1778 struct batadv_tt_common_entry
*tt_common
;
1779 struct batadv_tt_global_entry
*tt_global
;
1781 for (i
= 0; i
< hash
->size
; i
++) {
1782 head
= &hash
->table
[i
];
1783 list_lock
= &hash
->list_locks
[i
];
1785 spin_lock_bh(list_lock
);
1786 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
1788 tt_global
= container_of(tt_common
,
1789 struct batadv_tt_global_entry
,
1792 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1795 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1796 "Deleting global tt entry %pM (vid: %d): %s\n",
1797 tt_global
->common
.addr
,
1798 BATADV_PRINT_VID(tt_global
->common
.vid
),
1801 hlist_del_rcu(&tt_common
->hash_entry
);
1803 batadv_tt_global_entry_free_ref(tt_global
);
1805 spin_unlock_bh(list_lock
);
1809 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1811 struct batadv_hashtable
*hash
;
1812 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1813 struct batadv_tt_common_entry
*tt_common_entry
;
1814 struct batadv_tt_global_entry
*tt_global
;
1815 struct hlist_node
*node_tmp
;
1816 struct hlist_head
*head
;
1819 if (!bat_priv
->tt
.global_hash
)
1822 hash
= bat_priv
->tt
.global_hash
;
1824 for (i
= 0; i
< hash
->size
; i
++) {
1825 head
= &hash
->table
[i
];
1826 list_lock
= &hash
->list_locks
[i
];
1828 spin_lock_bh(list_lock
);
1829 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1831 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1832 tt_global
= container_of(tt_common_entry
,
1833 struct batadv_tt_global_entry
,
1835 batadv_tt_global_entry_free_ref(tt_global
);
1837 spin_unlock_bh(list_lock
);
1840 batadv_hash_destroy(hash
);
1842 bat_priv
->tt
.global_hash
= NULL
;
1846 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
1847 struct batadv_tt_global_entry
*tt_global_entry
)
1851 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
1852 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
1859 * batadv_transtable_search - get the mesh destination for a given client
1860 * @bat_priv: the bat priv with all the soft interface information
1861 * @src: mac address of the source client
1862 * @addr: mac address of the destination client
1863 * @vid: VLAN identifier
1865 * Returns a pointer to the originator that was selected as destination in the
1866 * mesh for contacting the client 'addr', NULL otherwise.
1867 * In case of multiple originators serving the same client, the function returns
1868 * the best one (best in terms of metric towards the destination node).
1870 * If the two clients are AP isolated the function returns NULL.
1872 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
1874 const uint8_t *addr
,
1877 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
1878 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
1879 struct batadv_orig_node
*orig_node
= NULL
;
1880 struct batadv_tt_orig_list_entry
*best_entry
;
1881 bool ap_isolation_enabled
= false;
1882 struct batadv_softif_vlan
*vlan
;
1884 /* if the AP isolation is requested on a VLAN, then check for its
1885 * setting in the proper VLAN private data structure
1887 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1889 ap_isolation_enabled
= atomic_read(&vlan
->ap_isolation
);
1890 batadv_softif_vlan_free_ref(vlan
);
1893 if (src
&& ap_isolation_enabled
) {
1894 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
, vid
);
1895 if (!tt_local_entry
||
1896 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
1900 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1901 if (!tt_global_entry
)
1904 /* check whether the clients should not communicate due to AP
1907 if (tt_local_entry
&&
1908 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
1912 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1913 /* found anything? */
1915 orig_node
= best_entry
->orig_node
;
1916 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1921 if (tt_global_entry
)
1922 batadv_tt_global_entry_free_ref(tt_global_entry
);
1924 batadv_tt_local_entry_free_ref(tt_local_entry
);
1930 * batadv_tt_global_crc - calculates the checksum of the local table belonging
1931 * to the given orig_node
1932 * @bat_priv: the bat priv with all the soft interface information
1933 * @orig_node: originator for which the CRC should be computed
1934 * @vid: VLAN identifier for which the CRC32 has to be computed
1936 * This function computes the checksum for the global table corresponding to a
1937 * specific originator. In particular, the checksum is computed as follows: For
1938 * each client connected to the originator the CRC32C of the MAC address and the
1939 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1942 * The idea behind is that CRC32C should be used as much as possible in order to
1943 * produce a unique hash of the table, but since the order which is used to feed
1944 * the CRC32C function affects the result and since every node in the network
1945 * probably sorts the clients differently, the hash function cannot be directly
1946 * computed over the entire table. Hence the CRC32C is used only on
1947 * the single client entry, while all the results are then xor'ed together
1948 * because the XOR operation can combine them all while trying to reduce the
1949 * noise as much as possible.
1951 * Returns the checksum of the global table of a given originator.
1953 static uint32_t batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
1954 struct batadv_orig_node
*orig_node
,
1957 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1958 struct batadv_tt_common_entry
*tt_common
;
1959 struct batadv_tt_global_entry
*tt_global
;
1960 struct hlist_head
*head
;
1961 uint32_t i
, crc_tmp
, crc
= 0;
1964 for (i
= 0; i
< hash
->size
; i
++) {
1965 head
= &hash
->table
[i
];
1968 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1969 tt_global
= container_of(tt_common
,
1970 struct batadv_tt_global_entry
,
1972 /* compute the CRC only for entries belonging to the
1973 * VLAN identified by the vid passed as parameter
1975 if (tt_common
->vid
!= vid
)
1978 /* Roaming clients are in the global table for
1979 * consistency only. They don't have to be
1980 * taken into account while computing the
1983 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
1985 /* Temporary clients have not been announced yet, so
1986 * they have to be skipped while computing the global
1989 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
1992 /* find out if this global entry is announced by this
1995 if (!batadv_tt_global_entry_has_orig(tt_global
,
1999 crc_tmp
= crc32c(0, &tt_common
->vid
,
2000 sizeof(tt_common
->vid
));
2002 /* compute the CRC on flags that have to be kept in sync
2005 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2006 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2008 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2017 * batadv_tt_local_crc - calculates the checksum of the local table
2018 * @bat_priv: the bat priv with all the soft interface information
2019 * @vid: VLAN identifier for which the CRC32 has to be computed
2021 * For details about the computation, please refer to the documentation for
2022 * batadv_tt_global_crc().
2024 * Returns the checksum of the local table
2026 static uint32_t batadv_tt_local_crc(struct batadv_priv
*bat_priv
,
2029 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2030 struct batadv_tt_common_entry
*tt_common
;
2031 struct hlist_head
*head
;
2032 uint32_t i
, crc_tmp
, crc
= 0;
2035 for (i
= 0; i
< hash
->size
; i
++) {
2036 head
= &hash
->table
[i
];
2039 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2040 /* compute the CRC only for entries belonging to the
2041 * VLAN identified by vid
2043 if (tt_common
->vid
!= vid
)
2046 /* not yet committed clients have not to be taken into
2047 * account while computing the CRC
2049 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
2052 crc_tmp
= crc32c(0, &tt_common
->vid
,
2053 sizeof(tt_common
->vid
));
2055 /* compute the CRC on flags that have to be kept in sync
2058 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2059 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2061 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2069 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
2071 struct batadv_tt_req_node
*node
, *safe
;
2073 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2075 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2076 list_del(&node
->list
);
2080 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2083 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
2084 struct batadv_orig_node
*orig_node
,
2085 const void *tt_buff
,
2086 uint16_t tt_buff_len
)
2088 /* Replace the old buffer only if I received something in the
2089 * last OGM (the OGM could carry no changes)
2091 spin_lock_bh(&orig_node
->tt_buff_lock
);
2092 if (tt_buff_len
> 0) {
2093 kfree(orig_node
->tt_buff
);
2094 orig_node
->tt_buff_len
= 0;
2095 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
2096 if (orig_node
->tt_buff
) {
2097 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
2098 orig_node
->tt_buff_len
= tt_buff_len
;
2101 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2104 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
2106 struct batadv_tt_req_node
*node
, *safe
;
2108 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2109 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2110 if (batadv_has_timed_out(node
->issued_at
,
2111 BATADV_TT_REQUEST_TIMEOUT
)) {
2112 list_del(&node
->list
);
2116 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2119 /* returns the pointer to the new tt_req_node struct if no request
2120 * has already been issued for this orig_node, NULL otherwise
2122 static struct batadv_tt_req_node
*
2123 batadv_new_tt_req_node(struct batadv_priv
*bat_priv
,
2124 struct batadv_orig_node
*orig_node
)
2126 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
2128 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2129 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
2130 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
2131 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
2132 BATADV_TT_REQUEST_TIMEOUT
))
2136 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
2140 memcpy(tt_req_node
->addr
, orig_node
->orig
, ETH_ALEN
);
2141 tt_req_node
->issued_at
= jiffies
;
2143 list_add(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
2145 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2150 * batadv_tt_local_valid - verify that given tt entry is a valid one
2151 * @entry_ptr: to be checked local tt entry
2152 * @data_ptr: not used but definition required to satisfy the callback prototype
2154 * Returns 1 if the entry is a valid, 0 otherwise.
2156 static int batadv_tt_local_valid(const void *entry_ptr
, const void *data_ptr
)
2158 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2160 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
2165 static int batadv_tt_global_valid(const void *entry_ptr
,
2166 const void *data_ptr
)
2168 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2169 const struct batadv_tt_global_entry
*tt_global_entry
;
2170 const struct batadv_orig_node
*orig_node
= data_ptr
;
2172 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
2173 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
2176 tt_global_entry
= container_of(tt_common_entry
,
2177 struct batadv_tt_global_entry
,
2180 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
2184 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2186 * @bat_priv: the bat priv with all the soft interface information
2187 * @hash: hash table containing the tt entries
2188 * @tt_len: expected tvlv tt data buffer length in number of bytes
2189 * @tvlv_buff: pointer to the buffer to fill with the TT data
2190 * @valid_cb: function to filter tt change entries
2191 * @cb_data: data passed to the filter function as argument
2193 static void batadv_tt_tvlv_generate(struct batadv_priv
*bat_priv
,
2194 struct batadv_hashtable
*hash
,
2195 void *tvlv_buff
, uint16_t tt_len
,
2196 int (*valid_cb
)(const void *, const void *),
2199 struct batadv_tt_common_entry
*tt_common_entry
;
2200 struct batadv_tvlv_tt_change
*tt_change
;
2201 struct hlist_head
*head
;
2202 uint16_t tt_tot
, tt_num_entries
= 0;
2205 tt_tot
= batadv_tt_entries(tt_len
);
2206 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_buff
;
2209 for (i
= 0; i
< hash
->size
; i
++) {
2210 head
= &hash
->table
[i
];
2212 hlist_for_each_entry_rcu(tt_common_entry
,
2214 if (tt_tot
== tt_num_entries
)
2217 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
2220 memcpy(tt_change
->addr
, tt_common_entry
->addr
,
2222 tt_change
->flags
= tt_common_entry
->flags
;
2223 tt_change
->vid
= htons(tt_common_entry
->vid
);
2224 tt_change
->reserved
= 0;
2234 * batadv_tt_global_check_crc - check if all the CRCs are correct
2235 * @orig_node: originator for which the CRCs have to be checked
2236 * @tt_vlan: pointer to the first tvlv VLAN entry
2237 * @num_vlan: number of tvlv VLAN entries
2238 * @create: if true, create VLAN objects if not found
2240 * Return true if all the received CRCs match the locally stored ones, false
2243 static bool batadv_tt_global_check_crc(struct batadv_orig_node
*orig_node
,
2244 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2247 struct batadv_tvlv_tt_vlan_data
*tt_vlan_tmp
;
2248 struct batadv_orig_node_vlan
*vlan
;
2251 /* check if each received CRC matches the locally stored one */
2252 for (i
= 0; i
< num_vlan
; i
++) {
2253 tt_vlan_tmp
= tt_vlan
+ i
;
2255 /* if orig_node is a backbone node for this VLAN, don't check
2256 * the CRC as we ignore all the global entries over it
2258 if (batadv_bla_is_backbone_gw_orig(orig_node
->bat_priv
,
2260 ntohs(tt_vlan_tmp
->vid
)))
2263 vlan
= batadv_orig_node_vlan_get(orig_node
,
2264 ntohs(tt_vlan_tmp
->vid
));
2268 if (vlan
->tt
.crc
!= ntohl(tt_vlan_tmp
->crc
))
2276 * batadv_tt_local_update_crc - update all the local CRCs
2277 * @bat_priv: the bat priv with all the soft interface information
2279 static void batadv_tt_local_update_crc(struct batadv_priv
*bat_priv
)
2281 struct batadv_softif_vlan
*vlan
;
2283 /* recompute the global CRC for each VLAN */
2285 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
2286 vlan
->tt
.crc
= batadv_tt_local_crc(bat_priv
, vlan
->vid
);
2292 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2293 * @bat_priv: the bat priv with all the soft interface information
2294 * @orig_node: the orig_node for which the CRCs have to be updated
2296 static void batadv_tt_global_update_crc(struct batadv_priv
*bat_priv
,
2297 struct batadv_orig_node
*orig_node
)
2299 struct batadv_orig_node_vlan
*vlan
;
2302 /* recompute the global CRC for each VLAN */
2304 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
2305 /* if orig_node is a backbone node for this VLAN, don't compute
2306 * the CRC as we ignore all the global entries over it
2308 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
,
2312 crc
= batadv_tt_global_crc(bat_priv
, orig_node
, vlan
->vid
);
2319 * batadv_send_tt_request - send a TT Request message to a given node
2320 * @bat_priv: the bat priv with all the soft interface information
2321 * @dst_orig_node: the destination of the message
2322 * @ttvn: the version number that the source of the message is looking for
2323 * @tt_vlan: pointer to the first tvlv VLAN object to request
2324 * @num_vlan: number of tvlv VLAN entries
2325 * @full_table: ask for the entire translation table if true, while only for the
2326 * last TT diff otherwise
2328 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
2329 struct batadv_orig_node
*dst_orig_node
,
2331 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2332 uint16_t num_vlan
, bool full_table
)
2334 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2335 struct batadv_tt_req_node
*tt_req_node
= NULL
;
2336 struct batadv_tvlv_tt_vlan_data
*tt_vlan_req
;
2337 struct batadv_hard_iface
*primary_if
;
2341 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2345 /* The new tt_req will be issued only if I'm not waiting for a
2346 * reply from the same orig_node yet
2348 tt_req_node
= batadv_new_tt_req_node(bat_priv
, dst_orig_node
);
2352 size
= sizeof(*tvlv_tt_data
) + sizeof(*tt_vlan_req
) * num_vlan
;
2353 tvlv_tt_data
= kzalloc(size
, GFP_ATOMIC
);
2357 tvlv_tt_data
->flags
= BATADV_TT_REQUEST
;
2358 tvlv_tt_data
->ttvn
= ttvn
;
2359 tvlv_tt_data
->num_vlan
= htons(num_vlan
);
2361 /* send all the CRCs within the request. This is needed by intermediate
2362 * nodes to ensure they have the correct table before replying
2364 tt_vlan_req
= (struct batadv_tvlv_tt_vlan_data
*)(tvlv_tt_data
+ 1);
2365 for (i
= 0; i
< num_vlan
; i
++) {
2366 tt_vlan_req
->vid
= tt_vlan
->vid
;
2367 tt_vlan_req
->crc
= tt_vlan
->crc
;
2374 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2376 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
2377 dst_orig_node
->orig
, full_table
? 'F' : '.');
2379 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
2380 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2381 dst_orig_node
->orig
, BATADV_TVLV_TT
, 1,
2382 tvlv_tt_data
, size
);
2387 batadv_hardif_free_ref(primary_if
);
2388 if (ret
&& tt_req_node
) {
2389 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2390 list_del(&tt_req_node
->list
);
2391 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2394 kfree(tvlv_tt_data
);
2399 * batadv_send_other_tt_response - send reply to tt request concerning another
2400 * node's translation table
2401 * @bat_priv: the bat priv with all the soft interface information
2402 * @tt_data: tt data containing the tt request information
2403 * @req_src: mac address of tt request sender
2404 * @req_dst: mac address of tt request recipient
2406 * Returns true if tt request reply was sent, false otherwise.
2408 static bool batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
2409 struct batadv_tvlv_tt_data
*tt_data
,
2410 uint8_t *req_src
, uint8_t *req_dst
)
2412 struct batadv_orig_node
*req_dst_orig_node
;
2413 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
2414 struct batadv_tvlv_tt_change
*tt_change
;
2415 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2416 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
2417 bool ret
= false, full_table
;
2418 uint8_t orig_ttvn
, req_ttvn
;
2422 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2423 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2424 req_src
, tt_data
->ttvn
, req_dst
,
2425 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2427 /* Let's get the orig node of the REAL destination */
2428 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_dst
);
2429 if (!req_dst_orig_node
)
2432 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2433 if (!res_dst_orig_node
)
2436 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
2437 req_ttvn
= tt_data
->ttvn
;
2439 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
2440 /* this node doesn't have the requested data */
2441 if (orig_ttvn
!= req_ttvn
||
2442 !batadv_tt_global_check_crc(req_dst_orig_node
, tt_vlan
,
2443 ntohs(tt_data
->num_vlan
)))
2446 /* If the full table has been explicitly requested */
2447 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
||
2448 !req_dst_orig_node
->tt_buff
)
2453 /* TT fragmentation hasn't been implemented yet, so send as many
2454 * TT entries fit a single packet as possible only
2457 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
2458 tt_len
= req_dst_orig_node
->tt_buff_len
;
2460 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2467 /* Copy the last orig_node's OGM buffer */
2468 memcpy(tt_change
, req_dst_orig_node
->tt_buff
,
2469 req_dst_orig_node
->tt_buff_len
);
2470 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2472 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2473 * in the initial part
2476 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2483 /* fill the rest of the tvlv with the real TT entries */
2484 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.global_hash
,
2486 batadv_tt_global_valid
,
2490 /* Don't send the response, if larger than fragmented packet. */
2491 tt_len
= sizeof(struct batadv_unicast_tvlv_packet
) + tvlv_len
;
2492 if (tt_len
> atomic_read(&bat_priv
->packet_size_max
)) {
2493 net_ratelimited_function(batadv_info
, bat_priv
->soft_iface
,
2494 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2495 res_dst_orig_node
->orig
);
2499 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2500 tvlv_tt_data
->ttvn
= req_ttvn
;
2503 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2505 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2506 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2507 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
,
2508 full_table
? 'F' : '.', req_ttvn
);
2510 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2512 batadv_tvlv_unicast_send(bat_priv
, req_dst_orig_node
->orig
,
2513 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2520 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2523 if (res_dst_orig_node
)
2524 batadv_orig_node_free_ref(res_dst_orig_node
);
2525 if (req_dst_orig_node
)
2526 batadv_orig_node_free_ref(req_dst_orig_node
);
2527 kfree(tvlv_tt_data
);
2532 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2534 * @bat_priv: the bat priv with all the soft interface information
2535 * @tt_data: tt data containing the tt request information
2536 * @req_src: mac address of tt request sender
2538 * Returns true if tt request reply was sent, false otherwise.
2540 static bool batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
2541 struct batadv_tvlv_tt_data
*tt_data
,
2544 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2545 struct batadv_hard_iface
*primary_if
= NULL
;
2546 struct batadv_tvlv_tt_change
*tt_change
;
2547 struct batadv_orig_node
*orig_node
;
2548 uint8_t my_ttvn
, req_ttvn
;
2553 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2554 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2555 req_src
, tt_data
->ttvn
,
2556 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2558 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2560 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2561 req_ttvn
= tt_data
->ttvn
;
2563 orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2567 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2571 /* If the full table has been explicitly requested or the gap
2572 * is too big send the whole local translation table
2574 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
2575 !bat_priv
->tt
.last_changeset
)
2580 /* TT fragmentation hasn't been implemented yet, so send as many
2581 * TT entries fit a single packet as possible only
2584 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
2586 tt_len
= bat_priv
->tt
.last_changeset_len
;
2587 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2594 /* Copy the last orig_node's OGM buffer */
2595 memcpy(tt_change
, bat_priv
->tt
.last_changeset
,
2596 bat_priv
->tt
.last_changeset_len
);
2597 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2599 req_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2601 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2602 * in the initial part
2605 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2612 /* fill the rest of the tvlv with the real TT entries */
2613 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.local_hash
,
2615 batadv_tt_local_valid
, NULL
);
2618 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2619 tvlv_tt_data
->ttvn
= req_ttvn
;
2622 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2624 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2625 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2626 orig_node
->orig
, full_table
? 'F' : '.', req_ttvn
);
2628 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2630 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2631 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2637 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2639 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2641 batadv_orig_node_free_ref(orig_node
);
2643 batadv_hardif_free_ref(primary_if
);
2644 kfree(tvlv_tt_data
);
2645 /* The packet was for this host, so it doesn't need to be re-routed */
2650 * batadv_send_tt_response - send reply to tt request
2651 * @bat_priv: the bat priv with all the soft interface information
2652 * @tt_data: tt data containing the tt request information
2653 * @req_src: mac address of tt request sender
2654 * @req_dst: mac address of tt request recipient
2656 * Returns true if tt request reply was sent, false otherwise.
2658 static bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
2659 struct batadv_tvlv_tt_data
*tt_data
,
2660 uint8_t *req_src
, uint8_t *req_dst
)
2662 if (batadv_is_my_mac(bat_priv
, req_dst
))
2663 return batadv_send_my_tt_response(bat_priv
, tt_data
, req_src
);
2665 return batadv_send_other_tt_response(bat_priv
, tt_data
,
2669 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2670 struct batadv_orig_node
*orig_node
,
2671 struct batadv_tvlv_tt_change
*tt_change
,
2672 uint16_t tt_num_changes
, uint8_t ttvn
)
2677 for (i
= 0; i
< tt_num_changes
; i
++) {
2678 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
2679 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
2680 batadv_tt_global_del(bat_priv
, orig_node
,
2681 (tt_change
+ i
)->addr
,
2682 ntohs((tt_change
+ i
)->vid
),
2683 "tt removed by changes",
2686 if (!batadv_tt_global_add(bat_priv
, orig_node
,
2687 (tt_change
+ i
)->addr
,
2688 ntohs((tt_change
+ i
)->vid
),
2689 (tt_change
+ i
)->flags
, ttvn
))
2690 /* In case of problem while storing a
2691 * global_entry, we stop the updating
2692 * procedure without committing the
2693 * ttvn change. This will avoid to send
2694 * corrupted data on tt_request
2699 orig_node
->tt_initialised
= true;
2702 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
2703 struct batadv_tvlv_tt_change
*tt_change
,
2704 uint8_t ttvn
, uint8_t *resp_src
,
2705 uint16_t num_entries
)
2707 struct batadv_orig_node
*orig_node
;
2709 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2713 /* Purge the old table first.. */
2714 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
2715 "Received full table");
2717 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
, num_entries
,
2720 spin_lock_bh(&orig_node
->tt_buff_lock
);
2721 kfree(orig_node
->tt_buff
);
2722 orig_node
->tt_buff_len
= 0;
2723 orig_node
->tt_buff
= NULL
;
2724 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2726 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2730 batadv_orig_node_free_ref(orig_node
);
2733 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2734 struct batadv_orig_node
*orig_node
,
2735 uint16_t tt_num_changes
, uint8_t ttvn
,
2736 struct batadv_tvlv_tt_change
*tt_change
)
2738 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2739 tt_num_changes
, ttvn
);
2741 batadv_tt_save_orig_buffer(bat_priv
, orig_node
, tt_change
,
2742 batadv_tt_len(tt_num_changes
));
2743 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2747 * batadv_is_my_client - check if a client is served by the local node
2748 * @bat_priv: the bat priv with all the soft interface information
2749 * @addr: the mac adress of the client to check
2750 * @vid: VLAN identifier
2752 * Returns true if the client is served by this node, false otherwise.
2754 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
2757 struct batadv_tt_local_entry
*tt_local_entry
;
2760 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
2761 if (!tt_local_entry
)
2763 /* Check if the client has been logically deleted (but is kept for
2764 * consistency purpose)
2766 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2767 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2772 batadv_tt_local_entry_free_ref(tt_local_entry
);
2777 * batadv_handle_tt_response - process incoming tt reply
2778 * @bat_priv: the bat priv with all the soft interface information
2779 * @tt_data: tt data containing the tt request information
2780 * @resp_src: mac address of tt reply sender
2781 * @num_entries: number of tt change entries appended to the tt data
2783 static void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2784 struct batadv_tvlv_tt_data
*tt_data
,
2785 uint8_t *resp_src
, uint16_t num_entries
)
2787 struct batadv_tt_req_node
*node
, *safe
;
2788 struct batadv_orig_node
*orig_node
= NULL
;
2789 struct batadv_tvlv_tt_change
*tt_change
;
2790 uint8_t *tvlv_ptr
= (uint8_t *)tt_data
;
2791 uint16_t change_offset
;
2793 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2794 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2795 resp_src
, tt_data
->ttvn
, num_entries
,
2796 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2798 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2802 spin_lock_bh(&orig_node
->tt_lock
);
2804 change_offset
= sizeof(struct batadv_tvlv_tt_vlan_data
);
2805 change_offset
*= ntohs(tt_data
->num_vlan
);
2806 change_offset
+= sizeof(*tt_data
);
2807 tvlv_ptr
+= change_offset
;
2809 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_ptr
;
2810 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
) {
2811 batadv_tt_fill_gtable(bat_priv
, tt_change
, tt_data
->ttvn
,
2812 resp_src
, num_entries
);
2814 batadv_tt_update_changes(bat_priv
, orig_node
, num_entries
,
2815 tt_data
->ttvn
, tt_change
);
2818 /* Recalculate the CRC for this orig_node and store it */
2819 batadv_tt_global_update_crc(bat_priv
, orig_node
);
2821 spin_unlock_bh(&orig_node
->tt_lock
);
2823 /* Delete the tt_req_node from pending tt_requests list */
2824 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2825 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2826 if (!batadv_compare_eth(node
->addr
, resp_src
))
2828 list_del(&node
->list
);
2832 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2835 batadv_orig_node_free_ref(orig_node
);
2838 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
2840 struct batadv_tt_roam_node
*node
, *safe
;
2842 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2844 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2845 list_del(&node
->list
);
2849 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2852 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
2854 struct batadv_tt_roam_node
*node
, *safe
;
2856 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2857 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2858 if (!batadv_has_timed_out(node
->first_time
,
2859 BATADV_ROAMING_MAX_TIME
))
2862 list_del(&node
->list
);
2865 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2868 /* This function checks whether the client already reached the
2869 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2872 * returns true if the ROAMING_ADV can be sent, false otherwise
2874 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
,
2877 struct batadv_tt_roam_node
*tt_roam_node
;
2880 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2881 /* The new tt_req will be issued only if I'm not waiting for a
2882 * reply from the same orig_node yet
2884 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
2885 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
2888 if (batadv_has_timed_out(tt_roam_node
->first_time
,
2889 BATADV_ROAMING_MAX_TIME
))
2892 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
2893 /* Sorry, you roamed too many times! */
2900 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
2904 tt_roam_node
->first_time
= jiffies
;
2905 atomic_set(&tt_roam_node
->counter
,
2906 BATADV_ROAMING_MAX_COUNT
- 1);
2907 memcpy(tt_roam_node
->addr
, client
, ETH_ALEN
);
2909 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
2914 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2919 * batadv_send_roam_adv - send a roaming advertisement message
2920 * @bat_priv: the bat priv with all the soft interface information
2921 * @client: mac address of the roaming client
2922 * @vid: VLAN identifier
2923 * @orig_node: message destination
2925 * Send a ROAMING_ADV message to the node which was previously serving this
2926 * client. This is done to inform the node that from now on all traffic destined
2927 * for this particular roamed client has to be forwarded to the sender of the
2930 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
2932 struct batadv_orig_node
*orig_node
)
2934 struct batadv_hard_iface
*primary_if
;
2935 struct batadv_tvlv_roam_adv tvlv_roam
;
2937 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2941 /* before going on we have to check whether the client has
2942 * already roamed to us too many times
2944 if (!batadv_tt_check_roam_count(bat_priv
, client
))
2947 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2948 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2949 orig_node
->orig
, client
, BATADV_PRINT_VID(vid
));
2951 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
2953 memcpy(tvlv_roam
.client
, client
, sizeof(tvlv_roam
.client
));
2954 tvlv_roam
.vid
= htons(vid
);
2956 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2957 orig_node
->orig
, BATADV_TVLV_ROAM
, 1,
2958 &tvlv_roam
, sizeof(tvlv_roam
));
2962 batadv_hardif_free_ref(primary_if
);
2965 static void batadv_tt_purge(struct work_struct
*work
)
2967 struct delayed_work
*delayed_work
;
2968 struct batadv_priv_tt
*priv_tt
;
2969 struct batadv_priv
*bat_priv
;
2971 delayed_work
= container_of(work
, struct delayed_work
, work
);
2972 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
2973 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
2975 batadv_tt_local_purge(bat_priv
, BATADV_TT_LOCAL_TIMEOUT
);
2976 batadv_tt_global_purge(bat_priv
);
2977 batadv_tt_req_purge(bat_priv
);
2978 batadv_tt_roam_purge(bat_priv
);
2980 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
2981 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
2984 void batadv_tt_free(struct batadv_priv
*bat_priv
)
2986 batadv_tvlv_container_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
2987 batadv_tvlv_handler_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
2989 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
2991 batadv_tt_local_table_free(bat_priv
);
2992 batadv_tt_global_table_free(bat_priv
);
2993 batadv_tt_req_list_free(bat_priv
);
2994 batadv_tt_changes_list_free(bat_priv
);
2995 batadv_tt_roam_list_free(bat_priv
);
2997 kfree(bat_priv
->tt
.last_changeset
);
3001 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3002 * table and possibly count them in the TT size
3003 * @bat_priv: the bat priv with all the soft interface information
3004 * @flags: the flag to switch
3005 * @enable: whether to set or unset the flag
3006 * @count: whether to increase the TT size by the number of changed entries
3008 static void batadv_tt_local_set_flags(struct batadv_priv
*bat_priv
,
3009 uint16_t flags
, bool enable
, bool count
)
3011 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3012 struct batadv_tt_common_entry
*tt_common_entry
;
3013 uint16_t changed_num
= 0;
3014 struct hlist_head
*head
;
3020 for (i
= 0; i
< hash
->size
; i
++) {
3021 head
= &hash
->table
[i
];
3024 hlist_for_each_entry_rcu(tt_common_entry
,
3027 if ((tt_common_entry
->flags
& flags
) == flags
)
3029 tt_common_entry
->flags
|= flags
;
3031 if (!(tt_common_entry
->flags
& flags
))
3033 tt_common_entry
->flags
&= ~flags
;
3040 batadv_tt_local_size_inc(bat_priv
,
3041 tt_common_entry
->vid
);
3047 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3048 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
3050 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3051 struct batadv_tt_common_entry
*tt_common
;
3052 struct batadv_tt_local_entry
*tt_local
;
3053 struct hlist_node
*node_tmp
;
3054 struct hlist_head
*head
;
3055 spinlock_t
*list_lock
; /* protects write access to the hash lists */
3061 for (i
= 0; i
< hash
->size
; i
++) {
3062 head
= &hash
->table
[i
];
3063 list_lock
= &hash
->list_locks
[i
];
3065 spin_lock_bh(list_lock
);
3066 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
3068 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
3071 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3072 "Deleting local tt entry (%pM, vid: %d): pending\n",
3074 BATADV_PRINT_VID(tt_common
->vid
));
3076 batadv_tt_local_size_dec(bat_priv
, tt_common
->vid
);
3077 hlist_del_rcu(&tt_common
->hash_entry
);
3078 tt_local
= container_of(tt_common
,
3079 struct batadv_tt_local_entry
,
3081 batadv_tt_local_entry_free_ref(tt_local
);
3083 spin_unlock_bh(list_lock
);
3088 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3089 * which have been queued in the time since the last commit
3090 * @bat_priv: the bat priv with all the soft interface information
3092 * Caller must hold tt->commit_lock.
3094 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv
*bat_priv
)
3096 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1) {
3097 if (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))
3098 batadv_tt_tvlv_container_update(bat_priv
);
3102 batadv_tt_local_set_flags(bat_priv
, BATADV_TT_CLIENT_NEW
, false, true);
3104 batadv_tt_local_purge_pending_clients(bat_priv
);
3105 batadv_tt_local_update_crc(bat_priv
);
3107 /* Increment the TTVN only once per OGM interval */
3108 atomic_inc(&bat_priv
->tt
.vn
);
3109 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3110 "Local changes committed, updating to ttvn %u\n",
3111 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
3113 /* reset the sending counter */
3114 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
3115 batadv_tt_tvlv_container_update(bat_priv
);
3119 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3120 * have been queued in the time since the last commit
3121 * @bat_priv: the bat priv with all the soft interface information
3123 void batadv_tt_local_commit_changes(struct batadv_priv
*bat_priv
)
3125 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3126 batadv_tt_local_commit_changes_nolock(bat_priv
);
3127 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3130 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, uint8_t *src
,
3131 uint8_t *dst
, unsigned short vid
)
3133 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
3134 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
3135 struct batadv_softif_vlan
*vlan
;
3138 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
3139 if (!vlan
|| !atomic_read(&vlan
->ap_isolation
))
3142 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
, vid
);
3143 if (!tt_local_entry
)
3146 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
, vid
);
3147 if (!tt_global_entry
)
3150 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
3157 batadv_softif_vlan_free_ref(vlan
);
3158 if (tt_global_entry
)
3159 batadv_tt_global_entry_free_ref(tt_global_entry
);
3161 batadv_tt_local_entry_free_ref(tt_local_entry
);
3166 * batadv_tt_update_orig - update global translation table with new tt
3167 * information received via ogms
3168 * @bat_priv: the bat priv with all the soft interface information
3169 * @orig: the orig_node of the ogm
3170 * @tt_vlan: pointer to the first tvlv VLAN entry
3171 * @tt_num_vlan: number of tvlv VLAN entries
3172 * @tt_change: pointer to the first entry in the TT buffer
3173 * @tt_num_changes: number of tt changes inside the tt buffer
3174 * @ttvn: translation table version number of this changeset
3175 * @tt_crc: crc32 checksum of orig node's translation table
3177 static void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
3178 struct batadv_orig_node
*orig_node
,
3179 const void *tt_buff
, uint16_t tt_num_vlan
,
3180 struct batadv_tvlv_tt_change
*tt_change
,
3181 uint16_t tt_num_changes
, uint8_t ttvn
)
3183 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
3184 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3185 bool full_table
= true;
3187 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)tt_buff
;
3188 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3189 * increased by one -> we can apply the attached changes
3191 if ((!orig_node
->tt_initialised
&& ttvn
== 1) ||
3192 ttvn
- orig_ttvn
== 1) {
3193 /* the OGM could not contain the changes due to their size or
3194 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3196 * In this case send a tt request
3198 if (!tt_num_changes
) {
3203 spin_lock_bh(&orig_node
->tt_lock
);
3205 tt_change
= (struct batadv_tvlv_tt_change
*)tt_buff
;
3206 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
3209 /* Even if we received the precomputed crc with the OGM, we
3210 * prefer to recompute it to spot any possible inconsistency
3211 * in the global table
3213 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3215 spin_unlock_bh(&orig_node
->tt_lock
);
3217 /* The ttvn alone is not enough to guarantee consistency
3218 * because a single value could represent different states
3219 * (due to the wrap around). Thus a node has to check whether
3220 * the resulting table (after applying the changes) is still
3221 * consistent or not. E.g. a node could disconnect while its
3222 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3223 * checking the CRC value is mandatory to detect the
3226 if (!batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3230 /* if we missed more than one change or our tables are not
3231 * in sync anymore -> request fresh tt data
3233 if (!orig_node
->tt_initialised
|| ttvn
!= orig_ttvn
||
3234 !batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3237 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3238 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3239 orig_node
->orig
, ttvn
, orig_ttvn
,
3241 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
3242 tt_vlan
, tt_num_vlan
,
3250 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3251 * @bat_priv: the bat priv with all the soft interface information
3252 * @addr: the mac address of the client to check
3253 * @vid: VLAN identifier
3255 * Returns true if we know that the client has moved from its old originator
3256 * to another one. This entry is still kept for consistency purposes and will be
3257 * deleted later by a DEL or because of timeout
3259 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
3260 uint8_t *addr
, unsigned short vid
)
3262 struct batadv_tt_global_entry
*tt_global_entry
;
3265 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3266 if (!tt_global_entry
)
3269 ret
= tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3270 batadv_tt_global_entry_free_ref(tt_global_entry
);
3276 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3277 * @bat_priv: the bat priv with all the soft interface information
3278 * @addr: the mac address of the local client to query
3279 * @vid: VLAN identifier
3281 * Returns true if the local client is known to be roaming (it is not served by
3282 * this node anymore) or not. If yes, the client is still present in the table
3283 * to keep the latter consistent with the node TTVN
3285 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
3286 uint8_t *addr
, unsigned short vid
)
3288 struct batadv_tt_local_entry
*tt_local_entry
;
3291 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3292 if (!tt_local_entry
)
3295 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3296 batadv_tt_local_entry_free_ref(tt_local_entry
);
3301 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
3302 struct batadv_orig_node
*orig_node
,
3303 const unsigned char *addr
,
3308 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
, vid
,
3309 BATADV_TT_CLIENT_TEMP
,
3310 atomic_read(&orig_node
->last_ttvn
)))
3313 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3314 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3315 addr
, BATADV_PRINT_VID(vid
), orig_node
->orig
);
3322 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3323 * maximum packet size that can be transported through the mesh
3324 * @soft_iface: netdev struct of the mesh interface
3326 * Remove entries older than 'timeout' and half timeout if more entries need
3329 void batadv_tt_local_resize_to_mtu(struct net_device
*soft_iface
)
3331 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
3332 int packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
3333 int table_size
, timeout
= BATADV_TT_LOCAL_TIMEOUT
/ 2;
3334 bool reduced
= false;
3336 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3339 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
3340 if (packet_size_max
>= table_size
)
3343 batadv_tt_local_purge(bat_priv
, timeout
);
3344 batadv_tt_local_purge_pending_clients(bat_priv
);
3348 net_ratelimited_function(batadv_info
, soft_iface
,
3349 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3353 /* commit these changes immediately, to avoid synchronization problem
3357 batadv_tt_local_commit_changes_nolock(bat_priv
);
3359 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3363 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3364 * @bat_priv: the bat priv with all the soft interface information
3365 * @orig: the orig_node of the ogm
3366 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3367 * @tvlv_value: tvlv buffer containing the gateway data
3368 * @tvlv_value_len: tvlv buffer length
3370 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv
*bat_priv
,
3371 struct batadv_orig_node
*orig
,
3372 uint8_t flags
, void *tvlv_value
,
3373 uint16_t tvlv_value_len
)
3375 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3376 struct batadv_tvlv_tt_change
*tt_change
;
3377 struct batadv_tvlv_tt_data
*tt_data
;
3378 uint16_t num_entries
, num_vlan
;
3380 if (tvlv_value_len
< sizeof(*tt_data
))
3383 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3384 tvlv_value_len
-= sizeof(*tt_data
);
3386 num_vlan
= ntohs(tt_data
->num_vlan
);
3388 if (tvlv_value_len
< sizeof(*tt_vlan
) * num_vlan
)
3391 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
3392 tt_change
= (struct batadv_tvlv_tt_change
*)(tt_vlan
+ num_vlan
);
3393 tvlv_value_len
-= sizeof(*tt_vlan
) * num_vlan
;
3395 num_entries
= batadv_tt_entries(tvlv_value_len
);
3397 batadv_tt_update_orig(bat_priv
, orig
, tt_vlan
, num_vlan
, tt_change
,
3398 num_entries
, tt_data
->ttvn
);
3402 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3404 * @bat_priv: the bat priv with all the soft interface information
3405 * @src: mac address of tt tvlv sender
3406 * @dst: mac address of tt tvlv recipient
3407 * @tvlv_value: tvlv buffer containing the tt data
3408 * @tvlv_value_len: tvlv buffer length
3410 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3413 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3414 uint8_t *src
, uint8_t *dst
,
3416 uint16_t tvlv_value_len
)
3418 struct batadv_tvlv_tt_data
*tt_data
;
3419 uint16_t tt_vlan_len
, tt_num_entries
;
3423 if (tvlv_value_len
< sizeof(*tt_data
))
3424 return NET_RX_SUCCESS
;
3426 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3427 tvlv_value_len
-= sizeof(*tt_data
);
3429 tt_vlan_len
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3430 tt_vlan_len
*= ntohs(tt_data
->num_vlan
);
3432 if (tvlv_value_len
< tt_vlan_len
)
3433 return NET_RX_SUCCESS
;
3435 tvlv_value_len
-= tt_vlan_len
;
3436 tt_num_entries
= batadv_tt_entries(tvlv_value_len
);
3438 switch (tt_data
->flags
& BATADV_TT_DATA_TYPE_MASK
) {
3439 case BATADV_TT_REQUEST
:
3440 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
3442 /* If this node cannot provide a TT response the tt_request is
3445 ret
= batadv_send_tt_response(bat_priv
, tt_data
, src
, dst
);
3447 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3452 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3453 "Routing TT_REQUEST to %pM [%c]\n",
3455 /* tvlv API will re-route the packet */
3459 case BATADV_TT_RESPONSE
:
3460 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
3462 if (batadv_is_my_mac(bat_priv
, dst
)) {
3463 batadv_handle_tt_response(bat_priv
, tt_data
,
3464 src
, tt_num_entries
);
3465 return NET_RX_SUCCESS
;
3468 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3473 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3474 "Routing TT_RESPONSE to %pM [%c]\n", dst
, tt_flag
);
3476 /* tvlv API will re-route the packet */
3480 return NET_RX_SUCCESS
;
3484 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3485 * @bat_priv: the bat priv with all the soft interface information
3486 * @src: mac address of tt tvlv sender
3487 * @dst: mac address of tt tvlv recipient
3488 * @tvlv_value: tvlv buffer containing the tt data
3489 * @tvlv_value_len: tvlv buffer length
3491 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3494 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3495 uint8_t *src
, uint8_t *dst
,
3497 uint16_t tvlv_value_len
)
3499 struct batadv_tvlv_roam_adv
*roaming_adv
;
3500 struct batadv_orig_node
*orig_node
= NULL
;
3502 /* If this node is not the intended recipient of the
3503 * roaming advertisement the packet is forwarded
3504 * (the tvlv API will re-route the packet).
3506 if (!batadv_is_my_mac(bat_priv
, dst
))
3509 if (tvlv_value_len
< sizeof(*roaming_adv
))
3512 orig_node
= batadv_orig_hash_find(bat_priv
, src
);
3516 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
3517 roaming_adv
= (struct batadv_tvlv_roam_adv
*)tvlv_value
;
3519 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3520 "Received ROAMING_ADV from %pM (client %pM)\n",
3521 src
, roaming_adv
->client
);
3523 batadv_tt_global_add(bat_priv
, orig_node
, roaming_adv
->client
,
3524 ntohs(roaming_adv
->vid
), BATADV_TT_CLIENT_ROAM
,
3525 atomic_read(&orig_node
->last_ttvn
) + 1);
3529 batadv_orig_node_free_ref(orig_node
);
3530 return NET_RX_SUCCESS
;
3534 * batadv_tt_init - initialise the translation table internals
3535 * @bat_priv: the bat priv with all the soft interface information
3537 * Return 0 on success or negative error number in case of failure.
3539 int batadv_tt_init(struct batadv_priv
*bat_priv
)
3543 /* synchronized flags must be remote */
3544 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK
& BATADV_TT_REMOTE_MASK
));
3546 ret
= batadv_tt_local_init(bat_priv
);
3550 ret
= batadv_tt_global_init(bat_priv
);
3554 batadv_tvlv_handler_register(bat_priv
, batadv_tt_tvlv_ogm_handler_v1
,
3555 batadv_tt_tvlv_unicast_handler_v1
,
3556 BATADV_TVLV_TT
, 1, BATADV_NO_FLAGS
);
3558 batadv_tvlv_handler_register(bat_priv
, NULL
,
3559 batadv_roam_tvlv_unicast_handler_v1
,
3560 BATADV_TVLV_ROAM
, 1, BATADV_NO_FLAGS
);
3562 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
3563 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3564 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));