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, see <http://www.gnu.org/licenses/>.
19 #include "translation-table.h"
20 #include "soft-interface.h"
21 #include "hard-interface.h"
24 #include "originator.h"
26 #include "bridge_loop_avoidance.h"
28 #include <linux/crc32c.h>
31 static struct lock_class_key batadv_tt_local_hash_lock_class_key
;
32 static struct lock_class_key batadv_tt_global_hash_lock_class_key
;
34 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
36 struct batadv_orig_node
*orig_node
);
37 static void batadv_tt_purge(struct work_struct
*work
);
39 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
);
40 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
41 struct batadv_orig_node
*orig_node
,
42 const unsigned char *addr
,
43 unsigned short vid
, const char *message
,
46 /* returns 1 if they are the same mac addr */
47 static int batadv_compare_tt(const struct hlist_node
*node
, const void *data2
)
49 const void *data1
= container_of(node
, struct batadv_tt_common_entry
,
52 return batadv_compare_eth(data1
, data2
);
56 * batadv_choose_tt - return the index of the tt entry in the hash table
57 * @data: pointer to the tt_common_entry object to map
58 * @size: the size of the hash table
60 * Returns the hash index where the object represented by 'data' should be
63 static inline uint32_t batadv_choose_tt(const void *data
, uint32_t size
)
65 struct batadv_tt_common_entry
*tt
;
68 tt
= (struct batadv_tt_common_entry
*)data
;
69 hash
= batadv_hash_bytes(hash
, &tt
->addr
, ETH_ALEN
);
70 hash
= batadv_hash_bytes(hash
, &tt
->vid
, sizeof(tt
->vid
));
80 * batadv_tt_hash_find - look for a client in the given hash table
81 * @hash: the hash table to search
82 * @addr: the mac address of the client to look for
83 * @vid: VLAN identifier
85 * Returns a pointer to the tt_common struct belonging to the searched client if
86 * found, NULL otherwise.
88 static struct batadv_tt_common_entry
*
89 batadv_tt_hash_find(struct batadv_hashtable
*hash
, const uint8_t *addr
,
92 struct hlist_head
*head
;
93 struct batadv_tt_common_entry to_search
, *tt
, *tt_tmp
= NULL
;
99 memcpy(to_search
.addr
, addr
, ETH_ALEN
);
102 index
= batadv_choose_tt(&to_search
, hash
->size
);
103 head
= &hash
->table
[index
];
106 hlist_for_each_entry_rcu(tt
, head
, hash_entry
) {
107 if (!batadv_compare_eth(tt
, addr
))
113 if (!atomic_inc_not_zero(&tt
->refcount
))
125 * batadv_tt_local_hash_find - search the local table for a given client
126 * @bat_priv: the bat priv with all the soft interface information
127 * @addr: the mac address of the client to look for
128 * @vid: VLAN identifier
130 * Returns a pointer to the corresponding tt_local_entry struct if the client is
131 * found, NULL otherwise.
133 static struct batadv_tt_local_entry
*
134 batadv_tt_local_hash_find(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
137 struct batadv_tt_common_entry
*tt_common_entry
;
138 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
140 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.local_hash
, addr
,
143 tt_local_entry
= container_of(tt_common_entry
,
144 struct batadv_tt_local_entry
,
146 return tt_local_entry
;
150 * batadv_tt_global_hash_find - search the global table for a given client
151 * @bat_priv: the bat priv with all the soft interface information
152 * @addr: the mac address of the client to look for
153 * @vid: VLAN identifier
155 * Returns a pointer to the corresponding tt_global_entry struct if the client
156 * is found, NULL otherwise.
158 static struct batadv_tt_global_entry
*
159 batadv_tt_global_hash_find(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
162 struct batadv_tt_common_entry
*tt_common_entry
;
163 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
165 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.global_hash
, addr
,
168 tt_global_entry
= container_of(tt_common_entry
,
169 struct batadv_tt_global_entry
,
171 return tt_global_entry
;
175 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry
*tt_local_entry
)
177 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
178 kfree_rcu(tt_local_entry
, common
.rcu
);
182 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
183 * tt_global_entry and possibly free it
184 * @tt_global_entry: the object to free
187 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry
*tt_global_entry
)
189 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
190 batadv_tt_global_del_orig_list(tt_global_entry
);
191 kfree_rcu(tt_global_entry
, common
.rcu
);
195 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
197 struct batadv_tt_orig_list_entry
*orig_entry
;
199 orig_entry
= container_of(rcu
, struct batadv_tt_orig_list_entry
, rcu
);
201 /* We are in an rcu callback here, therefore we cannot use
202 * batadv_orig_node_free_ref() and its call_rcu():
203 * An rcu_barrier() wouldn't wait for that to finish
205 batadv_orig_node_free_ref_now(orig_entry
->orig_node
);
210 * batadv_tt_local_size_mod - change the size by v of the local table identified
212 * @bat_priv: the bat priv with all the soft interface information
213 * @vid: the VLAN identifier of the sub-table to change
214 * @v: the amount to sum to the local table size
216 static void batadv_tt_local_size_mod(struct batadv_priv
*bat_priv
,
217 unsigned short vid
, int v
)
219 struct batadv_softif_vlan
*vlan
;
221 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
225 atomic_add(v
, &vlan
->tt
.num_entries
);
227 batadv_softif_vlan_free_ref(vlan
);
231 * batadv_tt_local_size_inc - increase by one the local table size for the given
233 * @bat_priv: the bat priv with all the soft interface information
234 * @vid: the VLAN identifier
236 static void batadv_tt_local_size_inc(struct batadv_priv
*bat_priv
,
239 batadv_tt_local_size_mod(bat_priv
, vid
, 1);
243 * batadv_tt_local_size_dec - decrease by one the local table size for the given
245 * @bat_priv: the bat priv with all the soft interface information
246 * @vid: the VLAN identifier
248 static void batadv_tt_local_size_dec(struct batadv_priv
*bat_priv
,
251 batadv_tt_local_size_mod(bat_priv
, vid
, -1);
255 * batadv_tt_global_size_mod - change the size by v of the local table
257 * @bat_priv: the bat priv with all the soft interface information
258 * @vid: the VLAN identifier
259 * @v: the amount to sum to the global table size
261 static void batadv_tt_global_size_mod(struct batadv_orig_node
*orig_node
,
262 unsigned short vid
, int v
)
264 struct batadv_orig_node_vlan
*vlan
;
266 vlan
= batadv_orig_node_vlan_new(orig_node
, vid
);
270 if (atomic_add_return(v
, &vlan
->tt
.num_entries
) == 0) {
271 spin_lock_bh(&orig_node
->vlan_list_lock
);
272 list_del_rcu(&vlan
->list
);
273 spin_unlock_bh(&orig_node
->vlan_list_lock
);
274 batadv_orig_node_vlan_free_ref(vlan
);
277 batadv_orig_node_vlan_free_ref(vlan
);
281 * batadv_tt_global_size_inc - increase by one the global table size for the
283 * @orig_node: the originator which global table size has to be decreased
284 * @vid: the vlan identifier
286 static void batadv_tt_global_size_inc(struct batadv_orig_node
*orig_node
,
289 batadv_tt_global_size_mod(orig_node
, vid
, 1);
293 * batadv_tt_global_size_dec - decrease by one the global table size for the
295 * @orig_node: the originator which global table size has to be decreased
296 * @vid: the vlan identifier
298 static void batadv_tt_global_size_dec(struct batadv_orig_node
*orig_node
,
301 batadv_tt_global_size_mod(orig_node
, vid
, -1);
305 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry
*orig_entry
)
307 if (!atomic_dec_and_test(&orig_entry
->refcount
))
310 call_rcu(&orig_entry
->rcu
, batadv_tt_orig_list_entry_free_rcu
);
314 * batadv_tt_local_event - store a local TT event (ADD/DEL)
315 * @bat_priv: the bat priv with all the soft interface information
316 * @tt_local_entry: the TT entry involved in the event
317 * @event_flags: flags to store in the event structure
319 static void batadv_tt_local_event(struct batadv_priv
*bat_priv
,
320 struct batadv_tt_local_entry
*tt_local_entry
,
323 struct batadv_tt_change_node
*tt_change_node
, *entry
, *safe
;
324 struct batadv_tt_common_entry
*common
= &tt_local_entry
->common
;
325 uint8_t flags
= common
->flags
| event_flags
;
326 bool event_removed
= false;
327 bool del_op_requested
, del_op_entry
;
329 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
333 tt_change_node
->change
.flags
= flags
;
334 memset(tt_change_node
->change
.reserved
, 0,
335 sizeof(tt_change_node
->change
.reserved
));
336 memcpy(tt_change_node
->change
.addr
, common
->addr
, ETH_ALEN
);
337 tt_change_node
->change
.vid
= htons(common
->vid
);
339 del_op_requested
= flags
& BATADV_TT_CLIENT_DEL
;
341 /* check for ADD+DEL or DEL+ADD events */
342 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
343 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
345 if (!batadv_compare_eth(entry
->change
.addr
, common
->addr
))
348 /* DEL+ADD in the same orig interval have no effect and can be
349 * removed to avoid silly behaviour on the receiver side. The
350 * other way around (ADD+DEL) can happen in case of roaming of
351 * a client still in the NEW state. Roaming of NEW clients is
352 * now possible due to automatically recognition of "temporary"
355 del_op_entry
= entry
->change
.flags
& BATADV_TT_CLIENT_DEL
;
356 if (!del_op_requested
&& del_op_entry
)
358 if (del_op_requested
&& !del_op_entry
)
361 /* this is a second add in the same originator interval. It
362 * means that flags have been changed: update them!
364 if (!del_op_requested
&& !del_op_entry
)
365 entry
->change
.flags
= flags
;
369 list_del(&entry
->list
);
371 kfree(tt_change_node
);
372 event_removed
= true;
376 /* track the change in the OGMinterval list */
377 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
380 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
383 atomic_dec(&bat_priv
->tt
.local_changes
);
385 atomic_inc(&bat_priv
->tt
.local_changes
);
389 * batadv_tt_len - compute length in bytes of given number of tt changes
390 * @changes_num: number of tt changes
392 * Returns computed length in bytes.
394 static int batadv_tt_len(int changes_num
)
396 return changes_num
* sizeof(struct batadv_tvlv_tt_change
);
400 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
401 * @tt_len: available space
403 * Returns the number of entries.
405 static uint16_t batadv_tt_entries(uint16_t tt_len
)
407 return tt_len
/ batadv_tt_len(1);
411 * batadv_tt_local_table_transmit_size - calculates the local translation table
412 * size when transmitted over the air
413 * @bat_priv: the bat priv with all the soft interface information
415 * Returns local translation table size in bytes.
417 static int batadv_tt_local_table_transmit_size(struct batadv_priv
*bat_priv
)
419 uint16_t num_vlan
= 0, tt_local_entries
= 0;
420 struct batadv_softif_vlan
*vlan
;
424 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
426 tt_local_entries
+= atomic_read(&vlan
->tt
.num_entries
);
430 /* header size of tvlv encapsulated tt response payload */
431 hdr_size
= sizeof(struct batadv_unicast_tvlv_packet
);
432 hdr_size
+= sizeof(struct batadv_tvlv_hdr
);
433 hdr_size
+= sizeof(struct batadv_tvlv_tt_data
);
434 hdr_size
+= num_vlan
* sizeof(struct batadv_tvlv_tt_vlan_data
);
436 return hdr_size
+ batadv_tt_len(tt_local_entries
);
439 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
441 if (bat_priv
->tt
.local_hash
)
444 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
446 if (!bat_priv
->tt
.local_hash
)
449 batadv_hash_set_lock_class(bat_priv
->tt
.local_hash
,
450 &batadv_tt_local_hash_lock_class_key
);
455 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
456 struct batadv_tt_global_entry
*tt_global
,
459 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
460 "Deleting global tt entry %pM (vid: %d): %s\n",
461 tt_global
->common
.addr
,
462 BATADV_PRINT_VID(tt_global
->common
.vid
), message
);
464 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
465 batadv_choose_tt
, &tt_global
->common
);
466 batadv_tt_global_entry_free_ref(tt_global
);
470 * batadv_tt_local_add - add a new client to the local table or update an
472 * @soft_iface: netdev struct of the mesh interface
473 * @addr: the mac address of the client to add
474 * @vid: VLAN identifier
475 * @ifindex: index of the interface where the client is connected to (useful to
476 * identify wireless clients)
477 * @mark: the value contained in the skb->mark field of the received packet (if
480 * Returns true if the client was successfully added, false otherwise.
482 bool batadv_tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
483 unsigned short vid
, int ifindex
, uint32_t mark
)
485 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
486 struct batadv_tt_local_entry
*tt_local
;
487 struct batadv_tt_global_entry
*tt_global
;
488 struct net_device
*in_dev
= NULL
;
489 struct hlist_head
*head
;
490 struct batadv_tt_orig_list_entry
*orig_entry
;
491 int hash_added
, table_size
, packet_size_max
;
492 bool ret
= false, roamed_back
= false;
493 uint8_t remote_flags
;
496 if (ifindex
!= BATADV_NULL_IFINDEX
)
497 in_dev
= dev_get_by_index(&init_net
, ifindex
);
499 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
500 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
503 tt_local
->last_seen
= jiffies
;
504 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
505 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
506 "Re-adding pending client %pM (vid: %d)\n",
507 addr
, BATADV_PRINT_VID(vid
));
508 /* whatever the reason why the PENDING flag was set,
509 * this is a client which was enqueued to be removed in
510 * this orig_interval. Since it popped up again, the
511 * flag can be reset like it was never enqueued
513 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
517 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
518 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
519 "Roaming client %pM (vid: %d) came back to its original location\n",
520 addr
, BATADV_PRINT_VID(vid
));
521 /* the ROAM flag is set because this client roamed away
522 * and the node got a roaming_advertisement message. Now
523 * that the client popped up again at its original
524 * location such flag can be unset
526 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
532 /* Ignore the client if we cannot send it in a full table response. */
533 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
534 table_size
+= batadv_tt_len(1);
535 packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
536 if (table_size
> packet_size_max
) {
537 net_ratelimited_function(batadv_info
, soft_iface
,
538 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
539 table_size
, packet_size_max
, addr
);
543 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
547 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
548 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
549 addr
, BATADV_PRINT_VID(vid
),
550 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
552 memcpy(tt_local
->common
.addr
, addr
, ETH_ALEN
);
553 /* The local entry has to be marked as NEW to avoid to send it in
554 * a full table response going out before the next ttvn increment
555 * (consistency check)
557 tt_local
->common
.flags
= BATADV_TT_CLIENT_NEW
;
558 tt_local
->common
.vid
= vid
;
559 if (batadv_is_wifi_netdev(in_dev
))
560 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
561 atomic_set(&tt_local
->common
.refcount
, 2);
562 tt_local
->last_seen
= jiffies
;
563 tt_local
->common
.added_at
= tt_local
->last_seen
;
565 /* the batman interface mac address should never be purged */
566 if (batadv_compare_eth(addr
, soft_iface
->dev_addr
))
567 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NOPURGE
;
569 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
570 batadv_choose_tt
, &tt_local
->common
,
571 &tt_local
->common
.hash_entry
);
573 if (unlikely(hash_added
!= 0)) {
574 /* remove the reference for the hash */
575 batadv_tt_local_entry_free_ref(tt_local
);
580 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
583 /* Check whether it is a roaming, but don't do anything if the roaming
584 * process has already been handled
586 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
587 /* These node are probably going to update their tt table */
588 head
= &tt_global
->orig_list
;
590 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
591 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
592 tt_global
->common
.vid
,
593 orig_entry
->orig_node
);
597 batadv_tt_global_free(bat_priv
, tt_global
,
601 /* The global entry has to be marked as ROAMING and
602 * has to be kept for consistency purpose
604 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
605 tt_global
->roam_at
= jiffies
;
609 /* store the current remote flags before altering them. This helps
610 * understanding is flags are changing or not
612 remote_flags
= tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
;
614 if (batadv_is_wifi_netdev(in_dev
))
615 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
617 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_WIFI
;
619 /* check the mark in the skb: if it's equal to the configured
620 * isolation_mark, it means the packet is coming from an isolated
623 match_mark
= (mark
& bat_priv
->isolation_mark_mask
);
624 if (bat_priv
->isolation_mark_mask
&&
625 match_mark
== bat_priv
->isolation_mark
)
626 tt_local
->common
.flags
|= BATADV_TT_CLIENT_ISOLA
;
628 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ISOLA
;
630 /* if any "dynamic" flag has been modified, resend an ADD event for this
631 * entry so that all the nodes can get the new flags
633 if (remote_flags
^ (tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
))
634 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
641 batadv_tt_local_entry_free_ref(tt_local
);
643 batadv_tt_global_entry_free_ref(tt_global
);
648 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
649 * within a TT Response directed to another node
650 * @orig_node: originator for which the TT data has to be prepared
651 * @tt_data: uninitialised pointer to the address of the TVLV buffer
652 * @tt_change: uninitialised pointer to the address of the area where the TT
653 * changed can be stored
654 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
655 * function reserves the amount of space needed to send the entire global TT
656 * table. In case of success the value is updated with the real amount of
659 * Allocate the needed amount of memory for the entire TT TVLV and write its
660 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
661 * objects, one per active VLAN served by the originator node.
663 * Return the size of the allocated buffer or 0 in case of failure.
666 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node
*orig_node
,
667 struct batadv_tvlv_tt_data
**tt_data
,
668 struct batadv_tvlv_tt_change
**tt_change
,
671 uint16_t num_vlan
= 0, num_entries
= 0, change_offset
, tvlv_len
;
672 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
673 struct batadv_orig_node_vlan
*vlan
;
674 uint8_t *tt_change_ptr
;
677 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
679 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
682 change_offset
= sizeof(**tt_data
);
683 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
685 /* if tt_len is negative, allocate the space needed by the full table */
687 *tt_len
= batadv_tt_len(num_entries
);
690 tvlv_len
+= change_offset
;
692 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
698 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
699 (*tt_data
)->ttvn
= atomic_read(&orig_node
->last_ttvn
);
700 (*tt_data
)->num_vlan
= htons(num_vlan
);
702 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
703 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
704 tt_vlan
->vid
= htons(vlan
->vid
);
705 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
710 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
711 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
719 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
721 * @bat_priv: the bat priv with all the soft interface information
722 * @tt_data: uninitialised pointer to the address of the TVLV buffer
723 * @tt_change: uninitialised pointer to the address of the area where the TT
724 * changes can be stored
725 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
726 * function reserves the amount of space needed to send the entire local TT
727 * table. In case of success the value is updated with the real amount of
730 * Allocate the needed amount of memory for the entire TT TVLV and write its
731 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
732 * objects, one per active VLAN.
734 * Return the size of the allocated buffer or 0 in case of failure.
737 batadv_tt_prepare_tvlv_local_data(struct batadv_priv
*bat_priv
,
738 struct batadv_tvlv_tt_data
**tt_data
,
739 struct batadv_tvlv_tt_change
**tt_change
,
742 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
743 struct batadv_softif_vlan
*vlan
;
744 uint16_t num_vlan
= 0, num_entries
= 0, tvlv_len
;
745 uint8_t *tt_change_ptr
;
749 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
751 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
754 change_offset
= sizeof(**tt_data
);
755 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
757 /* if tt_len is negative, allocate the space needed by the full table */
759 *tt_len
= batadv_tt_len(num_entries
);
762 tvlv_len
+= change_offset
;
764 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
770 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
771 (*tt_data
)->ttvn
= atomic_read(&bat_priv
->tt
.vn
);
772 (*tt_data
)->num_vlan
= htons(num_vlan
);
774 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
775 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
776 tt_vlan
->vid
= htons(vlan
->vid
);
777 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
782 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
783 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
791 * batadv_tt_tvlv_container_update - update the translation table tvlv container
792 * after local tt changes have been committed
793 * @bat_priv: the bat priv with all the soft interface information
795 static void batadv_tt_tvlv_container_update(struct batadv_priv
*bat_priv
)
797 struct batadv_tt_change_node
*entry
, *safe
;
798 struct batadv_tvlv_tt_data
*tt_data
;
799 struct batadv_tvlv_tt_change
*tt_change
;
800 int tt_diff_len
, tt_change_len
= 0;
801 int tt_diff_entries_num
= 0, tt_diff_entries_count
= 0;
804 tt_diff_entries_num
= atomic_read(&bat_priv
->tt
.local_changes
);
805 tt_diff_len
= batadv_tt_len(tt_diff_entries_num
);
807 /* if we have too many changes for one packet don't send any
808 * and wait for the tt table request which will be fragmented
810 if (tt_diff_len
> bat_priv
->soft_iface
->mtu
)
813 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
, &tt_data
,
814 &tt_change
, &tt_diff_len
);
818 tt_data
->flags
= BATADV_TT_OGM_DIFF
;
820 if (tt_diff_len
== 0)
821 goto container_register
;
823 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
824 atomic_set(&bat_priv
->tt
.local_changes
, 0);
826 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
828 if (tt_diff_entries_count
< tt_diff_entries_num
) {
829 memcpy(tt_change
+ tt_diff_entries_count
,
831 sizeof(struct batadv_tvlv_tt_change
));
832 tt_diff_entries_count
++;
834 list_del(&entry
->list
);
837 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
839 /* Keep the buffer for possible tt_request */
840 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
841 kfree(bat_priv
->tt
.last_changeset
);
842 bat_priv
->tt
.last_changeset_len
= 0;
843 bat_priv
->tt
.last_changeset
= NULL
;
844 tt_change_len
= batadv_tt_len(tt_diff_entries_count
);
845 /* check whether this new OGM has no changes due to size problems */
846 if (tt_diff_entries_count
> 0) {
847 /* if kmalloc() fails we will reply with the full table
848 * instead of providing the diff
850 bat_priv
->tt
.last_changeset
= kzalloc(tt_diff_len
, GFP_ATOMIC
);
851 if (bat_priv
->tt
.last_changeset
) {
852 memcpy(bat_priv
->tt
.last_changeset
,
853 tt_change
, tt_change_len
);
854 bat_priv
->tt
.last_changeset_len
= tt_diff_len
;
857 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
860 batadv_tvlv_container_register(bat_priv
, BATADV_TVLV_TT
, 1, tt_data
,
865 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
867 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
868 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
869 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
870 struct batadv_tt_common_entry
*tt_common_entry
;
871 struct batadv_tt_local_entry
*tt_local
;
872 struct batadv_hard_iface
*primary_if
;
873 struct batadv_softif_vlan
*vlan
;
874 struct hlist_head
*head
;
879 unsigned long last_seen_jiffies
;
881 uint16_t np_flag
= BATADV_TT_CLIENT_NOPURGE
;
883 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
888 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
889 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
890 seq_printf(seq
, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
891 "Flags", "Last seen", "CRC");
893 for (i
= 0; i
< hash
->size
; i
++) {
894 head
= &hash
->table
[i
];
897 hlist_for_each_entry_rcu(tt_common_entry
,
899 tt_local
= container_of(tt_common_entry
,
900 struct batadv_tt_local_entry
,
902 vid
= tt_common_entry
->vid
;
903 last_seen_jiffies
= jiffies
- tt_local
->last_seen
;
904 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
905 last_seen_secs
= last_seen_msecs
/ 1000;
906 last_seen_msecs
= last_seen_msecs
% 1000;
908 no_purge
= tt_common_entry
->flags
& np_flag
;
910 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
912 seq_printf(seq
, "Cannot retrieve VLAN %d\n",
913 BATADV_PRINT_VID(vid
));
918 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
919 tt_common_entry
->addr
,
920 BATADV_PRINT_VID(tt_common_entry
->vid
),
921 (tt_common_entry
->flags
&
922 BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
923 no_purge
? 'P' : '.',
924 (tt_common_entry
->flags
&
925 BATADV_TT_CLIENT_NEW
? 'N' : '.'),
926 (tt_common_entry
->flags
&
927 BATADV_TT_CLIENT_PENDING
? 'X' : '.'),
928 (tt_common_entry
->flags
&
929 BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
930 (tt_common_entry
->flags
&
931 BATADV_TT_CLIENT_ISOLA
? 'I' : '.'),
932 no_purge
? 0 : last_seen_secs
,
933 no_purge
? 0 : last_seen_msecs
,
936 batadv_softif_vlan_free_ref(vlan
);
942 batadv_hardif_free_ref(primary_if
);
947 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
948 struct batadv_tt_local_entry
*tt_local_entry
,
949 uint16_t flags
, const char *message
)
951 batadv_tt_local_event(bat_priv
, tt_local_entry
, flags
);
953 /* The local client has to be marked as "pending to be removed" but has
954 * to be kept in the table in order to send it in a full table
955 * response issued before the net ttvn increment (consistency check)
957 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
959 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
960 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
961 tt_local_entry
->common
.addr
,
962 BATADV_PRINT_VID(tt_local_entry
->common
.vid
), message
);
966 * batadv_tt_local_remove - logically remove an entry from the local table
967 * @bat_priv: the bat priv with all the soft interface information
968 * @addr: the MAC address of the client to remove
969 * @vid: VLAN identifier
970 * @message: message to append to the log on deletion
971 * @roaming: true if the deletion is due to a roaming event
973 * Returns the flags assigned to the local entry before being deleted
975 uint16_t batadv_tt_local_remove(struct batadv_priv
*bat_priv
,
976 const uint8_t *addr
, unsigned short vid
,
977 const char *message
, bool roaming
)
979 struct batadv_tt_local_entry
*tt_local_entry
;
980 uint16_t flags
, curr_flags
= BATADV_NO_FLAGS
;
982 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
986 curr_flags
= tt_local_entry
->common
.flags
;
988 flags
= BATADV_TT_CLIENT_DEL
;
989 /* if this global entry addition is due to a roaming, the node has to
990 * mark the local entry as "roamed" in order to correctly reroute
994 flags
|= BATADV_TT_CLIENT_ROAM
;
995 /* mark the local client as ROAMed */
996 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
999 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
1000 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
1004 /* if this client has been added right now, it is possible to
1005 * immediately purge it
1007 batadv_tt_local_event(bat_priv
, tt_local_entry
, BATADV_TT_CLIENT_DEL
);
1008 hlist_del_rcu(&tt_local_entry
->common
.hash_entry
);
1009 batadv_tt_local_entry_free_ref(tt_local_entry
);
1013 batadv_tt_local_entry_free_ref(tt_local_entry
);
1019 * batadv_tt_local_purge_list - purge inactive tt local entries
1020 * @bat_priv: the bat priv with all the soft interface information
1021 * @head: pointer to the list containing the local tt entries
1022 * @timeout: parameter deciding whether a given tt local entry is considered
1025 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
1026 struct hlist_head
*head
,
1029 struct batadv_tt_local_entry
*tt_local_entry
;
1030 struct batadv_tt_common_entry
*tt_common_entry
;
1031 struct hlist_node
*node_tmp
;
1033 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
, head
,
1035 tt_local_entry
= container_of(tt_common_entry
,
1036 struct batadv_tt_local_entry
,
1038 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
1041 /* entry already marked for deletion */
1042 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
1045 if (!batadv_has_timed_out(tt_local_entry
->last_seen
, timeout
))
1048 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
1049 BATADV_TT_CLIENT_DEL
, "timed out");
1054 * batadv_tt_local_purge - purge inactive tt local entries
1055 * @bat_priv: the bat priv with all the soft interface information
1056 * @timeout: parameter deciding whether a given tt local entry is considered
1059 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
,
1062 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1063 struct hlist_head
*head
;
1064 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1067 for (i
= 0; i
< hash
->size
; i
++) {
1068 head
= &hash
->table
[i
];
1069 list_lock
= &hash
->list_locks
[i
];
1071 spin_lock_bh(list_lock
);
1072 batadv_tt_local_purge_list(bat_priv
, head
, timeout
);
1073 spin_unlock_bh(list_lock
);
1077 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
1079 struct batadv_hashtable
*hash
;
1080 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1081 struct batadv_tt_common_entry
*tt_common_entry
;
1082 struct batadv_tt_local_entry
*tt_local
;
1083 struct hlist_node
*node_tmp
;
1084 struct hlist_head
*head
;
1087 if (!bat_priv
->tt
.local_hash
)
1090 hash
= bat_priv
->tt
.local_hash
;
1092 for (i
= 0; i
< hash
->size
; i
++) {
1093 head
= &hash
->table
[i
];
1094 list_lock
= &hash
->list_locks
[i
];
1096 spin_lock_bh(list_lock
);
1097 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1099 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1100 tt_local
= container_of(tt_common_entry
,
1101 struct batadv_tt_local_entry
,
1103 batadv_tt_local_entry_free_ref(tt_local
);
1105 spin_unlock_bh(list_lock
);
1108 batadv_hash_destroy(hash
);
1110 bat_priv
->tt
.local_hash
= NULL
;
1113 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
1115 if (bat_priv
->tt
.global_hash
)
1118 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
1120 if (!bat_priv
->tt
.global_hash
)
1123 batadv_hash_set_lock_class(bat_priv
->tt
.global_hash
,
1124 &batadv_tt_global_hash_lock_class_key
);
1129 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
1131 struct batadv_tt_change_node
*entry
, *safe
;
1133 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
1135 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
1137 list_del(&entry
->list
);
1141 atomic_set(&bat_priv
->tt
.local_changes
, 0);
1142 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
1145 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1146 * batadv_tt_global_entry list
1148 * returns it with an increased refcounter, NULL if not found
1150 static struct batadv_tt_orig_list_entry
*
1151 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
1152 const struct batadv_orig_node
*orig_node
)
1154 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
1155 const struct hlist_head
*head
;
1158 head
= &entry
->orig_list
;
1159 hlist_for_each_entry_rcu(tmp_orig_entry
, head
, list
) {
1160 if (tmp_orig_entry
->orig_node
!= orig_node
)
1162 if (!atomic_inc_not_zero(&tmp_orig_entry
->refcount
))
1165 orig_entry
= tmp_orig_entry
;
1173 /* find out if an orig_node is already in the list of a tt_global_entry.
1174 * returns true if found, false otherwise
1177 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
1178 const struct batadv_orig_node
*orig_node
)
1180 struct batadv_tt_orig_list_entry
*orig_entry
;
1183 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
1186 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1193 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
1194 struct batadv_orig_node
*orig_node
, int ttvn
)
1196 struct batadv_tt_orig_list_entry
*orig_entry
;
1198 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
1200 /* refresh the ttvn: the current value could be a bogus one that
1201 * was added during a "temporary client detection"
1203 orig_entry
->ttvn
= ttvn
;
1207 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
1211 INIT_HLIST_NODE(&orig_entry
->list
);
1212 atomic_inc(&orig_node
->refcount
);
1213 batadv_tt_global_size_inc(orig_node
, tt_global
->common
.vid
);
1214 orig_entry
->orig_node
= orig_node
;
1215 orig_entry
->ttvn
= ttvn
;
1216 atomic_set(&orig_entry
->refcount
, 2);
1218 spin_lock_bh(&tt_global
->list_lock
);
1219 hlist_add_head_rcu(&orig_entry
->list
,
1220 &tt_global
->orig_list
);
1221 spin_unlock_bh(&tt_global
->list_lock
);
1224 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1228 * batadv_tt_global_add - add a new TT global entry or update an existing one
1229 * @bat_priv: the bat priv with all the soft interface information
1230 * @orig_node: the originator announcing the client
1231 * @tt_addr: the mac address of the non-mesh client
1232 * @vid: VLAN identifier
1233 * @flags: TT flags that have to be set for this non-mesh client
1234 * @ttvn: the tt version number ever announcing this non-mesh client
1236 * Add a new TT global entry for the given originator. If the entry already
1237 * exists add a new reference to the given originator (a global entry can have
1238 * references to multiple originators) and adjust the flags attribute to reflect
1239 * the function argument.
1240 * If a TT local entry exists for this non-mesh client remove it.
1242 * The caller must hold orig_node refcount.
1244 * Return true if the new entry has been added, false otherwise
1246 static bool batadv_tt_global_add(struct batadv_priv
*bat_priv
,
1247 struct batadv_orig_node
*orig_node
,
1248 const unsigned char *tt_addr
,
1249 unsigned short vid
, uint16_t flags
,
1252 struct batadv_tt_global_entry
*tt_global_entry
;
1253 struct batadv_tt_local_entry
*tt_local_entry
;
1256 struct batadv_tt_common_entry
*common
;
1257 uint16_t local_flags
;
1259 /* ignore global entries from backbone nodes */
1260 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
, vid
))
1263 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
, vid
);
1264 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
, vid
);
1266 /* if the node already has a local client for this entry, it has to wait
1267 * for a roaming advertisement instead of manually messing up the global
1270 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
1271 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
1274 if (!tt_global_entry
) {
1275 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
1276 if (!tt_global_entry
)
1279 common
= &tt_global_entry
->common
;
1280 memcpy(common
->addr
, tt_addr
, ETH_ALEN
);
1283 common
->flags
= flags
;
1284 tt_global_entry
->roam_at
= 0;
1285 /* node must store current time in case of roaming. This is
1286 * needed to purge this entry out on timeout (if nobody claims
1289 if (flags
& BATADV_TT_CLIENT_ROAM
)
1290 tt_global_entry
->roam_at
= jiffies
;
1291 atomic_set(&common
->refcount
, 2);
1292 common
->added_at
= jiffies
;
1294 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
1295 spin_lock_init(&tt_global_entry
->list_lock
);
1297 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
1299 batadv_choose_tt
, common
,
1300 &common
->hash_entry
);
1302 if (unlikely(hash_added
!= 0)) {
1303 /* remove the reference for the hash */
1304 batadv_tt_global_entry_free_ref(tt_global_entry
);
1308 common
= &tt_global_entry
->common
;
1309 /* If there is already a global entry, we can use this one for
1311 * But if we are trying to add a temporary client then here are
1312 * two options at this point:
1313 * 1) the global client is not a temporary client: the global
1314 * client has to be left as it is, temporary information
1315 * should never override any already known client state
1316 * 2) the global client is a temporary client: purge the
1317 * originator list and add the new one orig_entry
1319 if (flags
& BATADV_TT_CLIENT_TEMP
) {
1320 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
1322 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
1325 batadv_tt_global_del_orig_list(tt_global_entry
);
1326 goto add_orig_entry
;
1329 /* if the client was temporary added before receiving the first
1330 * OGM announcing it, we have to clear the TEMP flag
1332 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
1334 /* the change can carry possible "attribute" flags like the
1335 * TT_CLIENT_WIFI, therefore they have to be copied in the
1338 tt_global_entry
->common
.flags
|= flags
;
1340 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1341 * one originator left in the list and we previously received a
1342 * delete + roaming change for this originator.
1344 * We should first delete the old originator before adding the
1347 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
1348 batadv_tt_global_del_orig_list(tt_global_entry
);
1349 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
1350 tt_global_entry
->roam_at
= 0;
1354 /* add the new orig_entry (if needed) or update it */
1355 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
1357 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1358 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1359 common
->addr
, BATADV_PRINT_VID(common
->vid
),
1365 /* remove address from local hash if present */
1366 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
, vid
,
1367 "global tt received",
1368 flags
& BATADV_TT_CLIENT_ROAM
);
1369 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
1371 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
1372 /* this is a normal global add. Therefore the client is not in a
1373 * roaming state anymore.
1375 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
1378 if (tt_global_entry
)
1379 batadv_tt_global_entry_free_ref(tt_global_entry
);
1381 batadv_tt_local_entry_free_ref(tt_local_entry
);
1385 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
1386 * @bat_priv: the bat priv with all the soft interface information
1387 * @tt_global_entry: global translation table entry to be analyzed
1389 * This functon assumes the caller holds rcu_read_lock().
1390 * Returns best originator list entry or NULL on errors.
1392 static struct batadv_tt_orig_list_entry
*
1393 batadv_transtable_best_orig(struct batadv_priv
*bat_priv
,
1394 struct batadv_tt_global_entry
*tt_global_entry
)
1396 struct batadv_neigh_node
*router
, *best_router
= NULL
;
1397 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
1398 struct hlist_head
*head
;
1399 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
1401 head
= &tt_global_entry
->orig_list
;
1402 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1403 router
= batadv_orig_router_get(orig_entry
->orig_node
,
1409 bao
->bat_neigh_cmp(router
, BATADV_IF_DEFAULT
,
1410 best_router
, BATADV_IF_DEFAULT
) <= 0) {
1411 batadv_neigh_node_free_ref(router
);
1415 /* release the refcount for the "old" best */
1417 batadv_neigh_node_free_ref(best_router
);
1419 best_entry
= orig_entry
;
1420 best_router
= router
;
1424 batadv_neigh_node_free_ref(best_router
);
1429 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1430 * for this global entry
1431 * @bat_priv: the bat priv with all the soft interface information
1432 * @tt_global_entry: global translation table entry to be printed
1433 * @seq: debugfs table seq_file struct
1435 * This functon assumes the caller holds rcu_read_lock().
1438 batadv_tt_global_print_entry(struct batadv_priv
*bat_priv
,
1439 struct batadv_tt_global_entry
*tt_global_entry
,
1440 struct seq_file
*seq
)
1442 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
1443 struct batadv_tt_common_entry
*tt_common_entry
;
1444 struct batadv_orig_node_vlan
*vlan
;
1445 struct hlist_head
*head
;
1449 tt_common_entry
= &tt_global_entry
->common
;
1450 flags
= tt_common_entry
->flags
;
1452 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1454 vlan
= batadv_orig_node_vlan_get(best_entry
->orig_node
,
1455 tt_common_entry
->vid
);
1458 " * Cannot retrieve VLAN %d for originator %pM\n",
1459 BATADV_PRINT_VID(tt_common_entry
->vid
),
1460 best_entry
->orig_node
->orig
);
1464 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
1466 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1467 '*', tt_global_entry
->common
.addr
,
1468 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1469 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
1470 last_ttvn
, vlan
->tt
.crc
,
1471 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1472 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1473 (flags
& BATADV_TT_CLIENT_ISOLA
? 'I' : '.'),
1474 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1476 batadv_orig_node_vlan_free_ref(vlan
);
1480 head
= &tt_global_entry
->orig_list
;
1482 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1483 if (best_entry
== orig_entry
)
1486 vlan
= batadv_orig_node_vlan_get(orig_entry
->orig_node
,
1487 tt_common_entry
->vid
);
1490 " + Cannot retrieve VLAN %d for originator %pM\n",
1491 BATADV_PRINT_VID(tt_common_entry
->vid
),
1492 orig_entry
->orig_node
->orig
);
1496 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
1498 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1499 '+', tt_global_entry
->common
.addr
,
1500 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1501 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1502 last_ttvn
, vlan
->tt
.crc
,
1503 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1504 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1505 (flags
& BATADV_TT_CLIENT_ISOLA
? 'I' : '.'),
1506 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1508 batadv_orig_node_vlan_free_ref(vlan
);
1512 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1514 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1515 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1516 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1517 struct batadv_tt_common_entry
*tt_common_entry
;
1518 struct batadv_tt_global_entry
*tt_global
;
1519 struct batadv_hard_iface
*primary_if
;
1520 struct hlist_head
*head
;
1523 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1528 "Globally announced TT entries received via the mesh %s\n",
1530 seq_printf(seq
, " %-13s %s %s %-15s %s (%-10s) %s\n",
1531 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1534 for (i
= 0; i
< hash
->size
; i
++) {
1535 head
= &hash
->table
[i
];
1538 hlist_for_each_entry_rcu(tt_common_entry
,
1540 tt_global
= container_of(tt_common_entry
,
1541 struct batadv_tt_global_entry
,
1543 batadv_tt_global_print_entry(bat_priv
, tt_global
, seq
);
1549 batadv_hardif_free_ref(primary_if
);
1553 /* deletes the orig list of a tt_global_entry */
1555 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1557 struct hlist_head
*head
;
1558 struct hlist_node
*safe
;
1559 struct batadv_tt_orig_list_entry
*orig_entry
;
1561 spin_lock_bh(&tt_global_entry
->list_lock
);
1562 head
= &tt_global_entry
->orig_list
;
1563 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1564 hlist_del_rcu(&orig_entry
->list
);
1565 batadv_tt_global_size_dec(orig_entry
->orig_node
,
1566 tt_global_entry
->common
.vid
);
1567 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1569 spin_unlock_bh(&tt_global_entry
->list_lock
);
1573 batadv_tt_global_del_orig_entry(struct batadv_priv
*bat_priv
,
1574 struct batadv_tt_global_entry
*tt_global_entry
,
1575 struct batadv_orig_node
*orig_node
,
1576 const char *message
)
1578 struct hlist_head
*head
;
1579 struct hlist_node
*safe
;
1580 struct batadv_tt_orig_list_entry
*orig_entry
;
1583 spin_lock_bh(&tt_global_entry
->list_lock
);
1584 head
= &tt_global_entry
->orig_list
;
1585 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1586 if (orig_entry
->orig_node
== orig_node
) {
1587 vid
= tt_global_entry
->common
.vid
;
1588 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1589 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1591 tt_global_entry
->common
.addr
,
1592 BATADV_PRINT_VID(vid
), message
);
1593 hlist_del_rcu(&orig_entry
->list
);
1594 batadv_tt_global_size_dec(orig_node
,
1595 tt_global_entry
->common
.vid
);
1596 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1599 spin_unlock_bh(&tt_global_entry
->list_lock
);
1602 /* If the client is to be deleted, we check if it is the last origantor entry
1603 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1604 * timer, otherwise we simply remove the originator scheduled for deletion.
1607 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1608 struct batadv_tt_global_entry
*tt_global_entry
,
1609 struct batadv_orig_node
*orig_node
,
1610 const char *message
)
1612 bool last_entry
= true;
1613 struct hlist_head
*head
;
1614 struct batadv_tt_orig_list_entry
*orig_entry
;
1616 /* no local entry exists, case 1:
1617 * Check if this is the last one or if other entries exist.
1621 head
= &tt_global_entry
->orig_list
;
1622 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1623 if (orig_entry
->orig_node
!= orig_node
) {
1631 /* its the last one, mark for roaming. */
1632 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1633 tt_global_entry
->roam_at
= jiffies
;
1635 /* there is another entry, we can simply delete this
1636 * one and can still use the other one.
1638 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1639 orig_node
, message
);
1643 * batadv_tt_global_del - remove a client from the global table
1644 * @bat_priv: the bat priv with all the soft interface information
1645 * @orig_node: an originator serving this client
1646 * @addr: the mac address of the client
1647 * @vid: VLAN identifier
1648 * @message: a message explaining the reason for deleting the client to print
1649 * for debugging purpose
1650 * @roaming: true if the deletion has been triggered by a roaming event
1652 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1653 struct batadv_orig_node
*orig_node
,
1654 const unsigned char *addr
, unsigned short vid
,
1655 const char *message
, bool roaming
)
1657 struct batadv_tt_global_entry
*tt_global_entry
;
1658 struct batadv_tt_local_entry
*local_entry
= NULL
;
1660 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1661 if (!tt_global_entry
)
1665 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1666 orig_node
, message
);
1668 if (hlist_empty(&tt_global_entry
->orig_list
))
1669 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1675 /* if we are deleting a global entry due to a roam
1676 * event, there are two possibilities:
1677 * 1) the client roamed from node A to node B => if there
1678 * is only one originator left for this client, we mark
1679 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1680 * wait for node B to claim it. In case of timeout
1681 * the entry is purged.
1683 * If there are other originators left, we directly delete
1685 * 2) the client roamed to us => we can directly delete
1686 * the global entry, since it is useless now.
1688 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1689 tt_global_entry
->common
.addr
,
1692 /* local entry exists, case 2: client roamed to us. */
1693 batadv_tt_global_del_orig_list(tt_global_entry
);
1694 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1696 /* no local entry exists, case 1: check for roaming */
1697 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1698 orig_node
, message
);
1702 if (tt_global_entry
)
1703 batadv_tt_global_entry_free_ref(tt_global_entry
);
1705 batadv_tt_local_entry_free_ref(local_entry
);
1709 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1710 * given originator matching the provided vid
1711 * @bat_priv: the bat priv with all the soft interface information
1712 * @orig_node: the originator owning the entries to remove
1713 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1715 * @message: debug message to print as "reason"
1717 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1718 struct batadv_orig_node
*orig_node
,
1720 const char *message
)
1722 struct batadv_tt_global_entry
*tt_global
;
1723 struct batadv_tt_common_entry
*tt_common_entry
;
1725 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1726 struct hlist_node
*safe
;
1727 struct hlist_head
*head
;
1728 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1734 for (i
= 0; i
< hash
->size
; i
++) {
1735 head
= &hash
->table
[i
];
1736 list_lock
= &hash
->list_locks
[i
];
1738 spin_lock_bh(list_lock
);
1739 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1741 /* remove only matching entries */
1742 if (match_vid
>= 0 && tt_common_entry
->vid
!= match_vid
)
1745 tt_global
= container_of(tt_common_entry
,
1746 struct batadv_tt_global_entry
,
1749 batadv_tt_global_del_orig_entry(bat_priv
, tt_global
,
1750 orig_node
, message
);
1752 if (hlist_empty(&tt_global
->orig_list
)) {
1753 vid
= tt_global
->common
.vid
;
1754 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1755 "Deleting global tt entry %pM (vid: %d): %s\n",
1756 tt_global
->common
.addr
,
1757 BATADV_PRINT_VID(vid
), message
);
1758 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1759 batadv_tt_global_entry_free_ref(tt_global
);
1762 spin_unlock_bh(list_lock
);
1764 orig_node
->tt_initialised
= false;
1767 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1771 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1772 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1774 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1775 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1777 *msg
= "Roaming timeout\n";
1780 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1781 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1783 *msg
= "Temporary client timeout\n";
1789 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1791 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1792 struct hlist_head
*head
;
1793 struct hlist_node
*node_tmp
;
1794 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1797 struct batadv_tt_common_entry
*tt_common
;
1798 struct batadv_tt_global_entry
*tt_global
;
1800 for (i
= 0; i
< hash
->size
; i
++) {
1801 head
= &hash
->table
[i
];
1802 list_lock
= &hash
->list_locks
[i
];
1804 spin_lock_bh(list_lock
);
1805 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
1807 tt_global
= container_of(tt_common
,
1808 struct batadv_tt_global_entry
,
1811 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1814 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1815 "Deleting global tt entry %pM (vid: %d): %s\n",
1816 tt_global
->common
.addr
,
1817 BATADV_PRINT_VID(tt_global
->common
.vid
),
1820 hlist_del_rcu(&tt_common
->hash_entry
);
1822 batadv_tt_global_entry_free_ref(tt_global
);
1824 spin_unlock_bh(list_lock
);
1828 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1830 struct batadv_hashtable
*hash
;
1831 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1832 struct batadv_tt_common_entry
*tt_common_entry
;
1833 struct batadv_tt_global_entry
*tt_global
;
1834 struct hlist_node
*node_tmp
;
1835 struct hlist_head
*head
;
1838 if (!bat_priv
->tt
.global_hash
)
1841 hash
= bat_priv
->tt
.global_hash
;
1843 for (i
= 0; i
< hash
->size
; i
++) {
1844 head
= &hash
->table
[i
];
1845 list_lock
= &hash
->list_locks
[i
];
1847 spin_lock_bh(list_lock
);
1848 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1850 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1851 tt_global
= container_of(tt_common_entry
,
1852 struct batadv_tt_global_entry
,
1854 batadv_tt_global_entry_free_ref(tt_global
);
1856 spin_unlock_bh(list_lock
);
1859 batadv_hash_destroy(hash
);
1861 bat_priv
->tt
.global_hash
= NULL
;
1865 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
1866 struct batadv_tt_global_entry
*tt_global_entry
)
1870 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
1871 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
1874 /* check if the two clients are marked as isolated */
1875 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
&&
1876 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
)
1883 * batadv_transtable_search - get the mesh destination for a given client
1884 * @bat_priv: the bat priv with all the soft interface information
1885 * @src: mac address of the source client
1886 * @addr: mac address of the destination client
1887 * @vid: VLAN identifier
1889 * Returns a pointer to the originator that was selected as destination in the
1890 * mesh for contacting the client 'addr', NULL otherwise.
1891 * In case of multiple originators serving the same client, the function returns
1892 * the best one (best in terms of metric towards the destination node).
1894 * If the two clients are AP isolated the function returns NULL.
1896 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
1898 const uint8_t *addr
,
1901 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
1902 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
1903 struct batadv_orig_node
*orig_node
= NULL
;
1904 struct batadv_tt_orig_list_entry
*best_entry
;
1906 if (src
&& batadv_vlan_ap_isola_get(bat_priv
, vid
)) {
1907 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
, vid
);
1908 if (!tt_local_entry
||
1909 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
1913 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1914 if (!tt_global_entry
)
1917 /* check whether the clients should not communicate due to AP
1920 if (tt_local_entry
&&
1921 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
1925 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1926 /* found anything? */
1928 orig_node
= best_entry
->orig_node
;
1929 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1934 if (tt_global_entry
)
1935 batadv_tt_global_entry_free_ref(tt_global_entry
);
1937 batadv_tt_local_entry_free_ref(tt_local_entry
);
1943 * batadv_tt_global_crc - calculates the checksum of the local table belonging
1944 * to the given orig_node
1945 * @bat_priv: the bat priv with all the soft interface information
1946 * @orig_node: originator for which the CRC should be computed
1947 * @vid: VLAN identifier for which the CRC32 has to be computed
1949 * This function computes the checksum for the global table corresponding to a
1950 * specific originator. In particular, the checksum is computed as follows: For
1951 * each client connected to the originator the CRC32C of the MAC address and the
1952 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1955 * The idea behind is that CRC32C should be used as much as possible in order to
1956 * produce a unique hash of the table, but since the order which is used to feed
1957 * the CRC32C function affects the result and since every node in the network
1958 * probably sorts the clients differently, the hash function cannot be directly
1959 * computed over the entire table. Hence the CRC32C is used only on
1960 * the single client entry, while all the results are then xor'ed together
1961 * because the XOR operation can combine them all while trying to reduce the
1962 * noise as much as possible.
1964 * Returns the checksum of the global table of a given originator.
1966 static uint32_t batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
1967 struct batadv_orig_node
*orig_node
,
1970 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1971 struct batadv_tt_common_entry
*tt_common
;
1972 struct batadv_tt_global_entry
*tt_global
;
1973 struct hlist_head
*head
;
1974 uint32_t i
, crc_tmp
, crc
= 0;
1977 for (i
= 0; i
< hash
->size
; i
++) {
1978 head
= &hash
->table
[i
];
1981 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1982 tt_global
= container_of(tt_common
,
1983 struct batadv_tt_global_entry
,
1985 /* compute the CRC only for entries belonging to the
1986 * VLAN identified by the vid passed as parameter
1988 if (tt_common
->vid
!= vid
)
1991 /* Roaming clients are in the global table for
1992 * consistency only. They don't have to be
1993 * taken into account while computing the
1996 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
1998 /* Temporary clients have not been announced yet, so
1999 * they have to be skipped while computing the global
2002 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
2005 /* find out if this global entry is announced by this
2008 if (!batadv_tt_global_entry_has_orig(tt_global
,
2012 crc_tmp
= crc32c(0, &tt_common
->vid
,
2013 sizeof(tt_common
->vid
));
2015 /* compute the CRC on flags that have to be kept in sync
2018 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2019 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2021 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2030 * batadv_tt_local_crc - calculates the checksum of the local table
2031 * @bat_priv: the bat priv with all the soft interface information
2032 * @vid: VLAN identifier for which the CRC32 has to be computed
2034 * For details about the computation, please refer to the documentation for
2035 * batadv_tt_global_crc().
2037 * Returns the checksum of the local table
2039 static uint32_t batadv_tt_local_crc(struct batadv_priv
*bat_priv
,
2042 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2043 struct batadv_tt_common_entry
*tt_common
;
2044 struct hlist_head
*head
;
2045 uint32_t i
, crc_tmp
, crc
= 0;
2048 for (i
= 0; i
< hash
->size
; i
++) {
2049 head
= &hash
->table
[i
];
2052 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2053 /* compute the CRC only for entries belonging to the
2054 * VLAN identified by vid
2056 if (tt_common
->vid
!= vid
)
2059 /* not yet committed clients have not to be taken into
2060 * account while computing the CRC
2062 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
2065 crc_tmp
= crc32c(0, &tt_common
->vid
,
2066 sizeof(tt_common
->vid
));
2068 /* compute the CRC on flags that have to be kept in sync
2071 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2072 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2074 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2082 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
2084 struct batadv_tt_req_node
*node
, *safe
;
2086 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2088 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2089 list_del(&node
->list
);
2093 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2096 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
2097 struct batadv_orig_node
*orig_node
,
2098 const void *tt_buff
,
2099 uint16_t tt_buff_len
)
2101 /* Replace the old buffer only if I received something in the
2102 * last OGM (the OGM could carry no changes)
2104 spin_lock_bh(&orig_node
->tt_buff_lock
);
2105 if (tt_buff_len
> 0) {
2106 kfree(orig_node
->tt_buff
);
2107 orig_node
->tt_buff_len
= 0;
2108 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
2109 if (orig_node
->tt_buff
) {
2110 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
2111 orig_node
->tt_buff_len
= tt_buff_len
;
2114 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2117 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
2119 struct batadv_tt_req_node
*node
, *safe
;
2121 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2122 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2123 if (batadv_has_timed_out(node
->issued_at
,
2124 BATADV_TT_REQUEST_TIMEOUT
)) {
2125 list_del(&node
->list
);
2129 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2132 /* returns the pointer to the new tt_req_node struct if no request
2133 * has already been issued for this orig_node, NULL otherwise
2135 static struct batadv_tt_req_node
*
2136 batadv_new_tt_req_node(struct batadv_priv
*bat_priv
,
2137 struct batadv_orig_node
*orig_node
)
2139 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
2141 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2142 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
2143 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
2144 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
2145 BATADV_TT_REQUEST_TIMEOUT
))
2149 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
2153 memcpy(tt_req_node
->addr
, orig_node
->orig
, ETH_ALEN
);
2154 tt_req_node
->issued_at
= jiffies
;
2156 list_add(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
2158 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2163 * batadv_tt_local_valid - verify that given tt entry is a valid one
2164 * @entry_ptr: to be checked local tt entry
2165 * @data_ptr: not used but definition required to satisfy the callback prototype
2167 * Returns 1 if the entry is a valid, 0 otherwise.
2169 static int batadv_tt_local_valid(const void *entry_ptr
, const void *data_ptr
)
2171 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2173 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
2178 static int batadv_tt_global_valid(const void *entry_ptr
,
2179 const void *data_ptr
)
2181 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2182 const struct batadv_tt_global_entry
*tt_global_entry
;
2183 const struct batadv_orig_node
*orig_node
= data_ptr
;
2185 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
2186 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
2189 tt_global_entry
= container_of(tt_common_entry
,
2190 struct batadv_tt_global_entry
,
2193 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
2197 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2199 * @bat_priv: the bat priv with all the soft interface information
2200 * @hash: hash table containing the tt entries
2201 * @tt_len: expected tvlv tt data buffer length in number of bytes
2202 * @tvlv_buff: pointer to the buffer to fill with the TT data
2203 * @valid_cb: function to filter tt change entries
2204 * @cb_data: data passed to the filter function as argument
2206 static void batadv_tt_tvlv_generate(struct batadv_priv
*bat_priv
,
2207 struct batadv_hashtable
*hash
,
2208 void *tvlv_buff
, uint16_t tt_len
,
2209 int (*valid_cb
)(const void *, const void *),
2212 struct batadv_tt_common_entry
*tt_common_entry
;
2213 struct batadv_tvlv_tt_change
*tt_change
;
2214 struct hlist_head
*head
;
2215 uint16_t tt_tot
, tt_num_entries
= 0;
2218 tt_tot
= batadv_tt_entries(tt_len
);
2219 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_buff
;
2222 for (i
= 0; i
< hash
->size
; i
++) {
2223 head
= &hash
->table
[i
];
2225 hlist_for_each_entry_rcu(tt_common_entry
,
2227 if (tt_tot
== tt_num_entries
)
2230 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
2233 memcpy(tt_change
->addr
, tt_common_entry
->addr
,
2235 tt_change
->flags
= tt_common_entry
->flags
;
2236 tt_change
->vid
= htons(tt_common_entry
->vid
);
2237 memset(tt_change
->reserved
, 0,
2238 sizeof(tt_change
->reserved
));
2248 * batadv_tt_global_check_crc - check if all the CRCs are correct
2249 * @orig_node: originator for which the CRCs have to be checked
2250 * @tt_vlan: pointer to the first tvlv VLAN entry
2251 * @num_vlan: number of tvlv VLAN entries
2252 * @create: if true, create VLAN objects if not found
2254 * Return true if all the received CRCs match the locally stored ones, false
2257 static bool batadv_tt_global_check_crc(struct batadv_orig_node
*orig_node
,
2258 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2261 struct batadv_tvlv_tt_vlan_data
*tt_vlan_tmp
;
2262 struct batadv_orig_node_vlan
*vlan
;
2265 /* check if each received CRC matches the locally stored one */
2266 for (i
= 0; i
< num_vlan
; i
++) {
2267 tt_vlan_tmp
= tt_vlan
+ i
;
2269 /* if orig_node is a backbone node for this VLAN, don't check
2270 * the CRC as we ignore all the global entries over it
2272 if (batadv_bla_is_backbone_gw_orig(orig_node
->bat_priv
,
2274 ntohs(tt_vlan_tmp
->vid
)))
2277 vlan
= batadv_orig_node_vlan_get(orig_node
,
2278 ntohs(tt_vlan_tmp
->vid
));
2282 if (vlan
->tt
.crc
!= ntohl(tt_vlan_tmp
->crc
))
2290 * batadv_tt_local_update_crc - update all the local CRCs
2291 * @bat_priv: the bat priv with all the soft interface information
2293 static void batadv_tt_local_update_crc(struct batadv_priv
*bat_priv
)
2295 struct batadv_softif_vlan
*vlan
;
2297 /* recompute the global CRC for each VLAN */
2299 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
2300 vlan
->tt
.crc
= batadv_tt_local_crc(bat_priv
, vlan
->vid
);
2306 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2307 * @bat_priv: the bat priv with all the soft interface information
2308 * @orig_node: the orig_node for which the CRCs have to be updated
2310 static void batadv_tt_global_update_crc(struct batadv_priv
*bat_priv
,
2311 struct batadv_orig_node
*orig_node
)
2313 struct batadv_orig_node_vlan
*vlan
;
2316 /* recompute the global CRC for each VLAN */
2318 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
2319 /* if orig_node is a backbone node for this VLAN, don't compute
2320 * the CRC as we ignore all the global entries over it
2322 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
,
2326 crc
= batadv_tt_global_crc(bat_priv
, orig_node
, vlan
->vid
);
2333 * batadv_send_tt_request - send a TT Request message to a given node
2334 * @bat_priv: the bat priv with all the soft interface information
2335 * @dst_orig_node: the destination of the message
2336 * @ttvn: the version number that the source of the message is looking for
2337 * @tt_vlan: pointer to the first tvlv VLAN object to request
2338 * @num_vlan: number of tvlv VLAN entries
2339 * @full_table: ask for the entire translation table if true, while only for the
2340 * last TT diff otherwise
2342 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
2343 struct batadv_orig_node
*dst_orig_node
,
2345 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2346 uint16_t num_vlan
, bool full_table
)
2348 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2349 struct batadv_tt_req_node
*tt_req_node
= NULL
;
2350 struct batadv_tvlv_tt_vlan_data
*tt_vlan_req
;
2351 struct batadv_hard_iface
*primary_if
;
2355 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2359 /* The new tt_req will be issued only if I'm not waiting for a
2360 * reply from the same orig_node yet
2362 tt_req_node
= batadv_new_tt_req_node(bat_priv
, dst_orig_node
);
2366 size
= sizeof(*tvlv_tt_data
) + sizeof(*tt_vlan_req
) * num_vlan
;
2367 tvlv_tt_data
= kzalloc(size
, GFP_ATOMIC
);
2371 tvlv_tt_data
->flags
= BATADV_TT_REQUEST
;
2372 tvlv_tt_data
->ttvn
= ttvn
;
2373 tvlv_tt_data
->num_vlan
= htons(num_vlan
);
2375 /* send all the CRCs within the request. This is needed by intermediate
2376 * nodes to ensure they have the correct table before replying
2378 tt_vlan_req
= (struct batadv_tvlv_tt_vlan_data
*)(tvlv_tt_data
+ 1);
2379 for (i
= 0; i
< num_vlan
; i
++) {
2380 tt_vlan_req
->vid
= tt_vlan
->vid
;
2381 tt_vlan_req
->crc
= tt_vlan
->crc
;
2388 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2390 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
2391 dst_orig_node
->orig
, full_table
? 'F' : '.');
2393 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
2394 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2395 dst_orig_node
->orig
, BATADV_TVLV_TT
, 1,
2396 tvlv_tt_data
, size
);
2401 batadv_hardif_free_ref(primary_if
);
2402 if (ret
&& tt_req_node
) {
2403 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2404 list_del(&tt_req_node
->list
);
2405 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2408 kfree(tvlv_tt_data
);
2413 * batadv_send_other_tt_response - send reply to tt request concerning another
2414 * node's translation table
2415 * @bat_priv: the bat priv with all the soft interface information
2416 * @tt_data: tt data containing the tt request information
2417 * @req_src: mac address of tt request sender
2418 * @req_dst: mac address of tt request recipient
2420 * Returns true if tt request reply was sent, false otherwise.
2422 static bool batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
2423 struct batadv_tvlv_tt_data
*tt_data
,
2424 uint8_t *req_src
, uint8_t *req_dst
)
2426 struct batadv_orig_node
*req_dst_orig_node
;
2427 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
2428 struct batadv_tvlv_tt_change
*tt_change
;
2429 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2430 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
2431 bool ret
= false, full_table
;
2432 uint8_t orig_ttvn
, req_ttvn
;
2436 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2437 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2438 req_src
, tt_data
->ttvn
, req_dst
,
2439 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2441 /* Let's get the orig node of the REAL destination */
2442 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_dst
);
2443 if (!req_dst_orig_node
)
2446 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2447 if (!res_dst_orig_node
)
2450 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
2451 req_ttvn
= tt_data
->ttvn
;
2453 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
2454 /* this node doesn't have the requested data */
2455 if (orig_ttvn
!= req_ttvn
||
2456 !batadv_tt_global_check_crc(req_dst_orig_node
, tt_vlan
,
2457 ntohs(tt_data
->num_vlan
)))
2460 /* If the full table has been explicitly requested */
2461 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
||
2462 !req_dst_orig_node
->tt_buff
)
2467 /* TT fragmentation hasn't been implemented yet, so send as many
2468 * TT entries fit a single packet as possible only
2471 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
2472 tt_len
= req_dst_orig_node
->tt_buff_len
;
2474 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2481 /* Copy the last orig_node's OGM buffer */
2482 memcpy(tt_change
, req_dst_orig_node
->tt_buff
,
2483 req_dst_orig_node
->tt_buff_len
);
2484 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2486 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2487 * in the initial part
2490 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2497 /* fill the rest of the tvlv with the real TT entries */
2498 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.global_hash
,
2500 batadv_tt_global_valid
,
2504 /* Don't send the response, if larger than fragmented packet. */
2505 tt_len
= sizeof(struct batadv_unicast_tvlv_packet
) + tvlv_len
;
2506 if (tt_len
> atomic_read(&bat_priv
->packet_size_max
)) {
2507 net_ratelimited_function(batadv_info
, bat_priv
->soft_iface
,
2508 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2509 res_dst_orig_node
->orig
);
2513 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2514 tvlv_tt_data
->ttvn
= req_ttvn
;
2517 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2519 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2520 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2521 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
,
2522 full_table
? 'F' : '.', req_ttvn
);
2524 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2526 batadv_tvlv_unicast_send(bat_priv
, req_dst_orig_node
->orig
,
2527 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2534 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2537 if (res_dst_orig_node
)
2538 batadv_orig_node_free_ref(res_dst_orig_node
);
2539 if (req_dst_orig_node
)
2540 batadv_orig_node_free_ref(req_dst_orig_node
);
2541 kfree(tvlv_tt_data
);
2546 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2548 * @bat_priv: the bat priv with all the soft interface information
2549 * @tt_data: tt data containing the tt request information
2550 * @req_src: mac address of tt request sender
2552 * Returns true if tt request reply was sent, false otherwise.
2554 static bool batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
2555 struct batadv_tvlv_tt_data
*tt_data
,
2558 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2559 struct batadv_hard_iface
*primary_if
= NULL
;
2560 struct batadv_tvlv_tt_change
*tt_change
;
2561 struct batadv_orig_node
*orig_node
;
2562 uint8_t my_ttvn
, req_ttvn
;
2567 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2568 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2569 req_src
, tt_data
->ttvn
,
2570 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2572 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2574 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2575 req_ttvn
= tt_data
->ttvn
;
2577 orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2581 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2585 /* If the full table has been explicitly requested or the gap
2586 * is too big send the whole local translation table
2588 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
2589 !bat_priv
->tt
.last_changeset
)
2594 /* TT fragmentation hasn't been implemented yet, so send as many
2595 * TT entries fit a single packet as possible only
2598 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
2600 tt_len
= bat_priv
->tt
.last_changeset_len
;
2601 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2608 /* Copy the last orig_node's OGM buffer */
2609 memcpy(tt_change
, bat_priv
->tt
.last_changeset
,
2610 bat_priv
->tt
.last_changeset_len
);
2611 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2613 req_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2615 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2616 * in the initial part
2619 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2626 /* fill the rest of the tvlv with the real TT entries */
2627 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.local_hash
,
2629 batadv_tt_local_valid
, NULL
);
2632 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2633 tvlv_tt_data
->ttvn
= req_ttvn
;
2636 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2638 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2639 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2640 orig_node
->orig
, full_table
? 'F' : '.', req_ttvn
);
2642 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2644 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2645 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2651 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2653 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2655 batadv_orig_node_free_ref(orig_node
);
2657 batadv_hardif_free_ref(primary_if
);
2658 kfree(tvlv_tt_data
);
2659 /* The packet was for this host, so it doesn't need to be re-routed */
2664 * batadv_send_tt_response - send reply to tt request
2665 * @bat_priv: the bat priv with all the soft interface information
2666 * @tt_data: tt data containing the tt request information
2667 * @req_src: mac address of tt request sender
2668 * @req_dst: mac address of tt request recipient
2670 * Returns true if tt request reply was sent, false otherwise.
2672 static bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
2673 struct batadv_tvlv_tt_data
*tt_data
,
2674 uint8_t *req_src
, uint8_t *req_dst
)
2676 if (batadv_is_my_mac(bat_priv
, req_dst
))
2677 return batadv_send_my_tt_response(bat_priv
, tt_data
, req_src
);
2679 return batadv_send_other_tt_response(bat_priv
, tt_data
,
2683 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2684 struct batadv_orig_node
*orig_node
,
2685 struct batadv_tvlv_tt_change
*tt_change
,
2686 uint16_t tt_num_changes
, uint8_t ttvn
)
2691 for (i
= 0; i
< tt_num_changes
; i
++) {
2692 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
2693 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
2694 batadv_tt_global_del(bat_priv
, orig_node
,
2695 (tt_change
+ i
)->addr
,
2696 ntohs((tt_change
+ i
)->vid
),
2697 "tt removed by changes",
2700 if (!batadv_tt_global_add(bat_priv
, orig_node
,
2701 (tt_change
+ i
)->addr
,
2702 ntohs((tt_change
+ i
)->vid
),
2703 (tt_change
+ i
)->flags
, ttvn
))
2704 /* In case of problem while storing a
2705 * global_entry, we stop the updating
2706 * procedure without committing the
2707 * ttvn change. This will avoid to send
2708 * corrupted data on tt_request
2713 orig_node
->tt_initialised
= true;
2716 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
2717 struct batadv_tvlv_tt_change
*tt_change
,
2718 uint8_t ttvn
, uint8_t *resp_src
,
2719 uint16_t num_entries
)
2721 struct batadv_orig_node
*orig_node
;
2723 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2727 /* Purge the old table first.. */
2728 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
2729 "Received full table");
2731 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
, num_entries
,
2734 spin_lock_bh(&orig_node
->tt_buff_lock
);
2735 kfree(orig_node
->tt_buff
);
2736 orig_node
->tt_buff_len
= 0;
2737 orig_node
->tt_buff
= NULL
;
2738 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2740 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2744 batadv_orig_node_free_ref(orig_node
);
2747 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2748 struct batadv_orig_node
*orig_node
,
2749 uint16_t tt_num_changes
, uint8_t ttvn
,
2750 struct batadv_tvlv_tt_change
*tt_change
)
2752 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2753 tt_num_changes
, ttvn
);
2755 batadv_tt_save_orig_buffer(bat_priv
, orig_node
, tt_change
,
2756 batadv_tt_len(tt_num_changes
));
2757 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2761 * batadv_is_my_client - check if a client is served by the local node
2762 * @bat_priv: the bat priv with all the soft interface information
2763 * @addr: the mac adress of the client to check
2764 * @vid: VLAN identifier
2766 * Returns true if the client is served by this node, false otherwise.
2768 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
2771 struct batadv_tt_local_entry
*tt_local_entry
;
2774 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
2775 if (!tt_local_entry
)
2777 /* Check if the client has been logically deleted (but is kept for
2778 * consistency purpose)
2780 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2781 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2786 batadv_tt_local_entry_free_ref(tt_local_entry
);
2791 * batadv_handle_tt_response - process incoming tt reply
2792 * @bat_priv: the bat priv with all the soft interface information
2793 * @tt_data: tt data containing the tt request information
2794 * @resp_src: mac address of tt reply sender
2795 * @num_entries: number of tt change entries appended to the tt data
2797 static void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2798 struct batadv_tvlv_tt_data
*tt_data
,
2799 uint8_t *resp_src
, uint16_t num_entries
)
2801 struct batadv_tt_req_node
*node
, *safe
;
2802 struct batadv_orig_node
*orig_node
= NULL
;
2803 struct batadv_tvlv_tt_change
*tt_change
;
2804 uint8_t *tvlv_ptr
= (uint8_t *)tt_data
;
2805 uint16_t change_offset
;
2807 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2808 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2809 resp_src
, tt_data
->ttvn
, num_entries
,
2810 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2812 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2816 spin_lock_bh(&orig_node
->tt_lock
);
2818 change_offset
= sizeof(struct batadv_tvlv_tt_vlan_data
);
2819 change_offset
*= ntohs(tt_data
->num_vlan
);
2820 change_offset
+= sizeof(*tt_data
);
2821 tvlv_ptr
+= change_offset
;
2823 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_ptr
;
2824 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
) {
2825 batadv_tt_fill_gtable(bat_priv
, tt_change
, tt_data
->ttvn
,
2826 resp_src
, num_entries
);
2828 batadv_tt_update_changes(bat_priv
, orig_node
, num_entries
,
2829 tt_data
->ttvn
, tt_change
);
2832 /* Recalculate the CRC for this orig_node and store it */
2833 batadv_tt_global_update_crc(bat_priv
, orig_node
);
2835 spin_unlock_bh(&orig_node
->tt_lock
);
2837 /* Delete the tt_req_node from pending tt_requests list */
2838 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2839 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2840 if (!batadv_compare_eth(node
->addr
, resp_src
))
2842 list_del(&node
->list
);
2846 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2849 batadv_orig_node_free_ref(orig_node
);
2852 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
2854 struct batadv_tt_roam_node
*node
, *safe
;
2856 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2858 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2859 list_del(&node
->list
);
2863 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2866 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
2868 struct batadv_tt_roam_node
*node
, *safe
;
2870 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2871 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2872 if (!batadv_has_timed_out(node
->first_time
,
2873 BATADV_ROAMING_MAX_TIME
))
2876 list_del(&node
->list
);
2879 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2882 /* This function checks whether the client already reached the
2883 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2886 * returns true if the ROAMING_ADV can be sent, false otherwise
2888 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
,
2891 struct batadv_tt_roam_node
*tt_roam_node
;
2894 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2895 /* The new tt_req will be issued only if I'm not waiting for a
2896 * reply from the same orig_node yet
2898 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
2899 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
2902 if (batadv_has_timed_out(tt_roam_node
->first_time
,
2903 BATADV_ROAMING_MAX_TIME
))
2906 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
2907 /* Sorry, you roamed too many times! */
2914 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
2918 tt_roam_node
->first_time
= jiffies
;
2919 atomic_set(&tt_roam_node
->counter
,
2920 BATADV_ROAMING_MAX_COUNT
- 1);
2921 memcpy(tt_roam_node
->addr
, client
, ETH_ALEN
);
2923 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
2928 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2933 * batadv_send_roam_adv - send a roaming advertisement message
2934 * @bat_priv: the bat priv with all the soft interface information
2935 * @client: mac address of the roaming client
2936 * @vid: VLAN identifier
2937 * @orig_node: message destination
2939 * Send a ROAMING_ADV message to the node which was previously serving this
2940 * client. This is done to inform the node that from now on all traffic destined
2941 * for this particular roamed client has to be forwarded to the sender of the
2944 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
2946 struct batadv_orig_node
*orig_node
)
2948 struct batadv_hard_iface
*primary_if
;
2949 struct batadv_tvlv_roam_adv tvlv_roam
;
2951 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2955 /* before going on we have to check whether the client has
2956 * already roamed to us too many times
2958 if (!batadv_tt_check_roam_count(bat_priv
, client
))
2961 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2962 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2963 orig_node
->orig
, client
, BATADV_PRINT_VID(vid
));
2965 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
2967 memcpy(tvlv_roam
.client
, client
, sizeof(tvlv_roam
.client
));
2968 tvlv_roam
.vid
= htons(vid
);
2970 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2971 orig_node
->orig
, BATADV_TVLV_ROAM
, 1,
2972 &tvlv_roam
, sizeof(tvlv_roam
));
2976 batadv_hardif_free_ref(primary_if
);
2979 static void batadv_tt_purge(struct work_struct
*work
)
2981 struct delayed_work
*delayed_work
;
2982 struct batadv_priv_tt
*priv_tt
;
2983 struct batadv_priv
*bat_priv
;
2985 delayed_work
= container_of(work
, struct delayed_work
, work
);
2986 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
2987 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
2989 batadv_tt_local_purge(bat_priv
, BATADV_TT_LOCAL_TIMEOUT
);
2990 batadv_tt_global_purge(bat_priv
);
2991 batadv_tt_req_purge(bat_priv
);
2992 batadv_tt_roam_purge(bat_priv
);
2994 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
2995 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
2998 void batadv_tt_free(struct batadv_priv
*bat_priv
)
3000 batadv_tvlv_container_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3001 batadv_tvlv_handler_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3003 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
3005 batadv_tt_local_table_free(bat_priv
);
3006 batadv_tt_global_table_free(bat_priv
);
3007 batadv_tt_req_list_free(bat_priv
);
3008 batadv_tt_changes_list_free(bat_priv
);
3009 batadv_tt_roam_list_free(bat_priv
);
3011 kfree(bat_priv
->tt
.last_changeset
);
3015 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3016 * table and possibly count them in the TT size
3017 * @bat_priv: the bat priv with all the soft interface information
3018 * @flags: the flag to switch
3019 * @enable: whether to set or unset the flag
3020 * @count: whether to increase the TT size by the number of changed entries
3022 static void batadv_tt_local_set_flags(struct batadv_priv
*bat_priv
,
3023 uint16_t flags
, bool enable
, bool count
)
3025 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3026 struct batadv_tt_common_entry
*tt_common_entry
;
3027 uint16_t changed_num
= 0;
3028 struct hlist_head
*head
;
3034 for (i
= 0; i
< hash
->size
; i
++) {
3035 head
= &hash
->table
[i
];
3038 hlist_for_each_entry_rcu(tt_common_entry
,
3041 if ((tt_common_entry
->flags
& flags
) == flags
)
3043 tt_common_entry
->flags
|= flags
;
3045 if (!(tt_common_entry
->flags
& flags
))
3047 tt_common_entry
->flags
&= ~flags
;
3054 batadv_tt_local_size_inc(bat_priv
,
3055 tt_common_entry
->vid
);
3061 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3062 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
3064 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3065 struct batadv_tt_common_entry
*tt_common
;
3066 struct batadv_tt_local_entry
*tt_local
;
3067 struct hlist_node
*node_tmp
;
3068 struct hlist_head
*head
;
3069 spinlock_t
*list_lock
; /* protects write access to the hash lists */
3075 for (i
= 0; i
< hash
->size
; i
++) {
3076 head
= &hash
->table
[i
];
3077 list_lock
= &hash
->list_locks
[i
];
3079 spin_lock_bh(list_lock
);
3080 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
3082 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
3085 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3086 "Deleting local tt entry (%pM, vid: %d): pending\n",
3088 BATADV_PRINT_VID(tt_common
->vid
));
3090 batadv_tt_local_size_dec(bat_priv
, tt_common
->vid
);
3091 hlist_del_rcu(&tt_common
->hash_entry
);
3092 tt_local
= container_of(tt_common
,
3093 struct batadv_tt_local_entry
,
3095 batadv_tt_local_entry_free_ref(tt_local
);
3097 spin_unlock_bh(list_lock
);
3102 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3103 * which have been queued in the time since the last commit
3104 * @bat_priv: the bat priv with all the soft interface information
3106 * Caller must hold tt->commit_lock.
3108 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv
*bat_priv
)
3110 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1) {
3111 if (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))
3112 batadv_tt_tvlv_container_update(bat_priv
);
3116 batadv_tt_local_set_flags(bat_priv
, BATADV_TT_CLIENT_NEW
, false, true);
3118 batadv_tt_local_purge_pending_clients(bat_priv
);
3119 batadv_tt_local_update_crc(bat_priv
);
3121 /* Increment the TTVN only once per OGM interval */
3122 atomic_inc(&bat_priv
->tt
.vn
);
3123 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3124 "Local changes committed, updating to ttvn %u\n",
3125 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
3127 /* reset the sending counter */
3128 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
3129 batadv_tt_tvlv_container_update(bat_priv
);
3133 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3134 * have been queued in the time since the last commit
3135 * @bat_priv: the bat priv with all the soft interface information
3137 void batadv_tt_local_commit_changes(struct batadv_priv
*bat_priv
)
3139 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3140 batadv_tt_local_commit_changes_nolock(bat_priv
);
3141 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3144 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, uint8_t *src
,
3145 uint8_t *dst
, unsigned short vid
)
3147 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
3148 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
3149 struct batadv_softif_vlan
*vlan
;
3152 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
3153 if (!vlan
|| !atomic_read(&vlan
->ap_isolation
))
3156 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
, vid
);
3157 if (!tt_local_entry
)
3160 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
, vid
);
3161 if (!tt_global_entry
)
3164 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
3171 batadv_softif_vlan_free_ref(vlan
);
3172 if (tt_global_entry
)
3173 batadv_tt_global_entry_free_ref(tt_global_entry
);
3175 batadv_tt_local_entry_free_ref(tt_local_entry
);
3180 * batadv_tt_update_orig - update global translation table with new tt
3181 * information received via ogms
3182 * @bat_priv: the bat priv with all the soft interface information
3183 * @orig: the orig_node of the ogm
3184 * @tt_vlan: pointer to the first tvlv VLAN entry
3185 * @tt_num_vlan: number of tvlv VLAN entries
3186 * @tt_change: pointer to the first entry in the TT buffer
3187 * @tt_num_changes: number of tt changes inside the tt buffer
3188 * @ttvn: translation table version number of this changeset
3189 * @tt_crc: crc32 checksum of orig node's translation table
3191 static void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
3192 struct batadv_orig_node
*orig_node
,
3193 const void *tt_buff
, uint16_t tt_num_vlan
,
3194 struct batadv_tvlv_tt_change
*tt_change
,
3195 uint16_t tt_num_changes
, uint8_t ttvn
)
3197 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
3198 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3199 bool full_table
= true;
3201 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)tt_buff
;
3202 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3203 * increased by one -> we can apply the attached changes
3205 if ((!orig_node
->tt_initialised
&& ttvn
== 1) ||
3206 ttvn
- orig_ttvn
== 1) {
3207 /* the OGM could not contain the changes due to their size or
3208 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3210 * In this case send a tt request
3212 if (!tt_num_changes
) {
3217 spin_lock_bh(&orig_node
->tt_lock
);
3219 tt_change
= (struct batadv_tvlv_tt_change
*)tt_buff
;
3220 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
3223 /* Even if we received the precomputed crc with the OGM, we
3224 * prefer to recompute it to spot any possible inconsistency
3225 * in the global table
3227 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3229 spin_unlock_bh(&orig_node
->tt_lock
);
3231 /* The ttvn alone is not enough to guarantee consistency
3232 * because a single value could represent different states
3233 * (due to the wrap around). Thus a node has to check whether
3234 * the resulting table (after applying the changes) is still
3235 * consistent or not. E.g. a node could disconnect while its
3236 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3237 * checking the CRC value is mandatory to detect the
3240 if (!batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3244 /* if we missed more than one change or our tables are not
3245 * in sync anymore -> request fresh tt data
3247 if (!orig_node
->tt_initialised
|| ttvn
!= orig_ttvn
||
3248 !batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3251 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3252 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3253 orig_node
->orig
, ttvn
, orig_ttvn
,
3255 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
3256 tt_vlan
, tt_num_vlan
,
3264 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3265 * @bat_priv: the bat priv with all the soft interface information
3266 * @addr: the mac address of the client to check
3267 * @vid: VLAN identifier
3269 * Returns true if we know that the client has moved from its old originator
3270 * to another one. This entry is still kept for consistency purposes and will be
3271 * deleted later by a DEL or because of timeout
3273 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
3274 uint8_t *addr
, unsigned short vid
)
3276 struct batadv_tt_global_entry
*tt_global_entry
;
3279 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3280 if (!tt_global_entry
)
3283 ret
= tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3284 batadv_tt_global_entry_free_ref(tt_global_entry
);
3290 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3291 * @bat_priv: the bat priv with all the soft interface information
3292 * @addr: the mac address of the local client to query
3293 * @vid: VLAN identifier
3295 * Returns true if the local client is known to be roaming (it is not served by
3296 * this node anymore) or not. If yes, the client is still present in the table
3297 * to keep the latter consistent with the node TTVN
3299 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
3300 uint8_t *addr
, unsigned short vid
)
3302 struct batadv_tt_local_entry
*tt_local_entry
;
3305 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3306 if (!tt_local_entry
)
3309 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3310 batadv_tt_local_entry_free_ref(tt_local_entry
);
3315 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
3316 struct batadv_orig_node
*orig_node
,
3317 const unsigned char *addr
,
3322 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
, vid
,
3323 BATADV_TT_CLIENT_TEMP
,
3324 atomic_read(&orig_node
->last_ttvn
)))
3327 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3328 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3329 addr
, BATADV_PRINT_VID(vid
), orig_node
->orig
);
3336 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3337 * maximum packet size that can be transported through the mesh
3338 * @soft_iface: netdev struct of the mesh interface
3340 * Remove entries older than 'timeout' and half timeout if more entries need
3343 void batadv_tt_local_resize_to_mtu(struct net_device
*soft_iface
)
3345 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
3346 int packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
3347 int table_size
, timeout
= BATADV_TT_LOCAL_TIMEOUT
/ 2;
3348 bool reduced
= false;
3350 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3353 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
3354 if (packet_size_max
>= table_size
)
3357 batadv_tt_local_purge(bat_priv
, timeout
);
3358 batadv_tt_local_purge_pending_clients(bat_priv
);
3362 net_ratelimited_function(batadv_info
, soft_iface
,
3363 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3367 /* commit these changes immediately, to avoid synchronization problem
3371 batadv_tt_local_commit_changes_nolock(bat_priv
);
3373 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3377 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3378 * @bat_priv: the bat priv with all the soft interface information
3379 * @orig: the orig_node of the ogm
3380 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3381 * @tvlv_value: tvlv buffer containing the gateway data
3382 * @tvlv_value_len: tvlv buffer length
3384 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv
*bat_priv
,
3385 struct batadv_orig_node
*orig
,
3386 uint8_t flags
, void *tvlv_value
,
3387 uint16_t tvlv_value_len
)
3389 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3390 struct batadv_tvlv_tt_change
*tt_change
;
3391 struct batadv_tvlv_tt_data
*tt_data
;
3392 uint16_t num_entries
, num_vlan
;
3394 if (tvlv_value_len
< sizeof(*tt_data
))
3397 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3398 tvlv_value_len
-= sizeof(*tt_data
);
3400 num_vlan
= ntohs(tt_data
->num_vlan
);
3402 if (tvlv_value_len
< sizeof(*tt_vlan
) * num_vlan
)
3405 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
3406 tt_change
= (struct batadv_tvlv_tt_change
*)(tt_vlan
+ num_vlan
);
3407 tvlv_value_len
-= sizeof(*tt_vlan
) * num_vlan
;
3409 num_entries
= batadv_tt_entries(tvlv_value_len
);
3411 batadv_tt_update_orig(bat_priv
, orig
, tt_vlan
, num_vlan
, tt_change
,
3412 num_entries
, tt_data
->ttvn
);
3416 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3418 * @bat_priv: the bat priv with all the soft interface information
3419 * @src: mac address of tt tvlv sender
3420 * @dst: mac address of tt tvlv recipient
3421 * @tvlv_value: tvlv buffer containing the tt data
3422 * @tvlv_value_len: tvlv buffer length
3424 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3427 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3428 uint8_t *src
, uint8_t *dst
,
3430 uint16_t tvlv_value_len
)
3432 struct batadv_tvlv_tt_data
*tt_data
;
3433 uint16_t tt_vlan_len
, tt_num_entries
;
3437 if (tvlv_value_len
< sizeof(*tt_data
))
3438 return NET_RX_SUCCESS
;
3440 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3441 tvlv_value_len
-= sizeof(*tt_data
);
3443 tt_vlan_len
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3444 tt_vlan_len
*= ntohs(tt_data
->num_vlan
);
3446 if (tvlv_value_len
< tt_vlan_len
)
3447 return NET_RX_SUCCESS
;
3449 tvlv_value_len
-= tt_vlan_len
;
3450 tt_num_entries
= batadv_tt_entries(tvlv_value_len
);
3452 switch (tt_data
->flags
& BATADV_TT_DATA_TYPE_MASK
) {
3453 case BATADV_TT_REQUEST
:
3454 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
3456 /* If this node cannot provide a TT response the tt_request is
3459 ret
= batadv_send_tt_response(bat_priv
, tt_data
, src
, dst
);
3461 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3466 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3467 "Routing TT_REQUEST to %pM [%c]\n",
3469 /* tvlv API will re-route the packet */
3473 case BATADV_TT_RESPONSE
:
3474 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
3476 if (batadv_is_my_mac(bat_priv
, dst
)) {
3477 batadv_handle_tt_response(bat_priv
, tt_data
,
3478 src
, tt_num_entries
);
3479 return NET_RX_SUCCESS
;
3482 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3487 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3488 "Routing TT_RESPONSE to %pM [%c]\n", dst
, tt_flag
);
3490 /* tvlv API will re-route the packet */
3494 return NET_RX_SUCCESS
;
3498 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3499 * @bat_priv: the bat priv with all the soft interface information
3500 * @src: mac address of tt tvlv sender
3501 * @dst: mac address of tt tvlv recipient
3502 * @tvlv_value: tvlv buffer containing the tt data
3503 * @tvlv_value_len: tvlv buffer length
3505 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3508 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3509 uint8_t *src
, uint8_t *dst
,
3511 uint16_t tvlv_value_len
)
3513 struct batadv_tvlv_roam_adv
*roaming_adv
;
3514 struct batadv_orig_node
*orig_node
= NULL
;
3516 /* If this node is not the intended recipient of the
3517 * roaming advertisement the packet is forwarded
3518 * (the tvlv API will re-route the packet).
3520 if (!batadv_is_my_mac(bat_priv
, dst
))
3523 if (tvlv_value_len
< sizeof(*roaming_adv
))
3526 orig_node
= batadv_orig_hash_find(bat_priv
, src
);
3530 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
3531 roaming_adv
= (struct batadv_tvlv_roam_adv
*)tvlv_value
;
3533 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3534 "Received ROAMING_ADV from %pM (client %pM)\n",
3535 src
, roaming_adv
->client
);
3537 batadv_tt_global_add(bat_priv
, orig_node
, roaming_adv
->client
,
3538 ntohs(roaming_adv
->vid
), BATADV_TT_CLIENT_ROAM
,
3539 atomic_read(&orig_node
->last_ttvn
) + 1);
3543 batadv_orig_node_free_ref(orig_node
);
3544 return NET_RX_SUCCESS
;
3548 * batadv_tt_init - initialise the translation table internals
3549 * @bat_priv: the bat priv with all the soft interface information
3551 * Return 0 on success or negative error number in case of failure.
3553 int batadv_tt_init(struct batadv_priv
*bat_priv
)
3557 /* synchronized flags must be remote */
3558 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK
& BATADV_TT_REMOTE_MASK
));
3560 ret
= batadv_tt_local_init(bat_priv
);
3564 ret
= batadv_tt_global_init(bat_priv
);
3568 batadv_tvlv_handler_register(bat_priv
, batadv_tt_tvlv_ogm_handler_v1
,
3569 batadv_tt_tvlv_unicast_handler_v1
,
3570 BATADV_TVLV_TT
, 1, BATADV_NO_FLAGS
);
3572 batadv_tvlv_handler_register(bat_priv
, NULL
,
3573 batadv_roam_tvlv_unicast_handler_v1
,
3574 BATADV_TVLV_ROAM
, 1, BATADV_NO_FLAGS
);
3576 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
3577 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3578 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3584 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3585 * @bat_priv: the bat priv with all the soft interface information
3586 * @addr: the mac address of the client
3587 * @vid: the identifier of the VLAN where this client is connected
3589 * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3592 bool batadv_tt_global_is_isolated(struct batadv_priv
*bat_priv
,
3593 const uint8_t *addr
, unsigned short vid
)
3595 struct batadv_tt_global_entry
*tt
;
3598 tt
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3602 ret
= tt
->common
.flags
& BATADV_TT_CLIENT_ISOLA
;
3604 batadv_tt_global_entry_free_ref(tt
);