1 /* Copyright (C) 2007-2015 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/>.
18 #include "translation-table.h"
21 #include <linux/atomic.h>
22 #include <linux/bug.h>
23 #include <linux/byteorder/generic.h>
24 #include <linux/compiler.h>
25 #include <linux/crc32c.h>
26 #include <linux/errno.h>
27 #include <linux/etherdevice.h>
29 #include <linux/if_ether.h>
30 #include <linux/jhash.h>
31 #include <linux/jiffies.h>
32 #include <linux/kernel.h>
33 #include <linux/list.h>
34 #include <linux/lockdep.h>
35 #include <linux/netdevice.h>
36 #include <linux/rculist.h>
37 #include <linux/rcupdate.h>
38 #include <linux/seq_file.h>
39 #include <linux/slab.h>
40 #include <linux/spinlock.h>
41 #include <linux/stddef.h>
42 #include <linux/string.h>
43 #include <linux/workqueue.h>
44 #include <net/net_namespace.h>
46 #include "bridge_loop_avoidance.h"
47 #include "hard-interface.h"
49 #include "multicast.h"
50 #include "originator.h"
52 #include "soft-interface.h"
55 static struct lock_class_key batadv_tt_local_hash_lock_class_key
;
56 static struct lock_class_key batadv_tt_global_hash_lock_class_key
;
58 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
60 struct batadv_orig_node
*orig_node
);
61 static void batadv_tt_purge(struct work_struct
*work
);
63 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
);
64 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
65 struct batadv_orig_node
*orig_node
,
66 const unsigned char *addr
,
67 unsigned short vid
, const char *message
,
70 /* returns 1 if they are the same mac addr */
71 static int batadv_compare_tt(const struct hlist_node
*node
, const void *data2
)
73 const void *data1
= container_of(node
, struct batadv_tt_common_entry
,
76 return batadv_compare_eth(data1
, data2
);
80 * batadv_choose_tt - return the index of the tt entry in the hash table
81 * @data: pointer to the tt_common_entry object to map
82 * @size: the size of the hash table
84 * Returns the hash index where the object represented by 'data' should be
87 static inline uint32_t batadv_choose_tt(const void *data
, uint32_t size
)
89 struct batadv_tt_common_entry
*tt
;
92 tt
= (struct batadv_tt_common_entry
*)data
;
93 hash
= jhash(&tt
->addr
, ETH_ALEN
, hash
);
94 hash
= jhash(&tt
->vid
, sizeof(tt
->vid
), hash
);
100 * batadv_tt_hash_find - look for a client in the given hash table
101 * @hash: the hash table to search
102 * @addr: the mac address of the client to look for
103 * @vid: VLAN identifier
105 * Returns a pointer to the tt_common struct belonging to the searched client if
106 * found, NULL otherwise.
108 static struct batadv_tt_common_entry
*
109 batadv_tt_hash_find(struct batadv_hashtable
*hash
, const uint8_t *addr
,
112 struct hlist_head
*head
;
113 struct batadv_tt_common_entry to_search
, *tt
, *tt_tmp
= NULL
;
119 ether_addr_copy(to_search
.addr
, addr
);
122 index
= batadv_choose_tt(&to_search
, hash
->size
);
123 head
= &hash
->table
[index
];
126 hlist_for_each_entry_rcu(tt
, head
, hash_entry
) {
127 if (!batadv_compare_eth(tt
, addr
))
133 if (!atomic_inc_not_zero(&tt
->refcount
))
145 * batadv_tt_local_hash_find - search the local table for a given client
146 * @bat_priv: the bat priv with all the soft interface information
147 * @addr: the mac address of the client to look for
148 * @vid: VLAN identifier
150 * Returns a pointer to the corresponding tt_local_entry struct if the client is
151 * found, NULL otherwise.
153 static struct batadv_tt_local_entry
*
154 batadv_tt_local_hash_find(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
157 struct batadv_tt_common_entry
*tt_common_entry
;
158 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
160 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.local_hash
, addr
,
163 tt_local_entry
= container_of(tt_common_entry
,
164 struct batadv_tt_local_entry
,
166 return tt_local_entry
;
170 * batadv_tt_global_hash_find - search the global table for a given client
171 * @bat_priv: the bat priv with all the soft interface information
172 * @addr: the mac address of the client to look for
173 * @vid: VLAN identifier
175 * Returns a pointer to the corresponding tt_global_entry struct if the client
176 * is found, NULL otherwise.
178 static struct batadv_tt_global_entry
*
179 batadv_tt_global_hash_find(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
182 struct batadv_tt_common_entry
*tt_common_entry
;
183 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
185 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.global_hash
, addr
,
188 tt_global_entry
= container_of(tt_common_entry
,
189 struct batadv_tt_global_entry
,
191 return tt_global_entry
;
195 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry
*tt_local_entry
)
197 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
198 kfree_rcu(tt_local_entry
, common
.rcu
);
202 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
203 * tt_global_entry and possibly free it
204 * @tt_global_entry: the object to free
207 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry
*tt_global_entry
)
209 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
210 batadv_tt_global_del_orig_list(tt_global_entry
);
211 kfree_rcu(tt_global_entry
, common
.rcu
);
216 * batadv_tt_global_hash_count - count the number of orig entries
217 * @hash: hash table containing the tt entries
218 * @addr: the mac address of the client to count entries for
219 * @vid: VLAN identifier
221 * Return the number of originators advertising the given address/data
222 * (excluding ourself).
224 int batadv_tt_global_hash_count(struct batadv_priv
*bat_priv
,
225 const uint8_t *addr
, unsigned short vid
)
227 struct batadv_tt_global_entry
*tt_global_entry
;
230 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
231 if (!tt_global_entry
)
234 count
= atomic_read(&tt_global_entry
->orig_list_count
);
235 batadv_tt_global_entry_free_ref(tt_global_entry
);
240 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
242 struct batadv_tt_orig_list_entry
*orig_entry
;
244 orig_entry
= container_of(rcu
, struct batadv_tt_orig_list_entry
, rcu
);
246 /* We are in an rcu callback here, therefore we cannot use
247 * batadv_orig_node_free_ref() and its call_rcu():
248 * An rcu_barrier() wouldn't wait for that to finish
250 batadv_orig_node_free_ref_now(orig_entry
->orig_node
);
255 * batadv_tt_local_size_mod - change the size by v of the local table identified
257 * @bat_priv: the bat priv with all the soft interface information
258 * @vid: the VLAN identifier of the sub-table to change
259 * @v: the amount to sum to the local table size
261 static void batadv_tt_local_size_mod(struct batadv_priv
*bat_priv
,
262 unsigned short vid
, int v
)
264 struct batadv_softif_vlan
*vlan
;
266 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
270 atomic_add(v
, &vlan
->tt
.num_entries
);
272 batadv_softif_vlan_free_ref(vlan
);
276 * batadv_tt_local_size_inc - increase by one the local table size for the given
278 * @bat_priv: the bat priv with all the soft interface information
279 * @vid: the VLAN identifier
281 static void batadv_tt_local_size_inc(struct batadv_priv
*bat_priv
,
284 batadv_tt_local_size_mod(bat_priv
, vid
, 1);
288 * batadv_tt_local_size_dec - decrease by one the local table size for the given
290 * @bat_priv: the bat priv with all the soft interface information
291 * @vid: the VLAN identifier
293 static void batadv_tt_local_size_dec(struct batadv_priv
*bat_priv
,
296 batadv_tt_local_size_mod(bat_priv
, vid
, -1);
300 * batadv_tt_global_size_mod - change the size by v of the local table
302 * @bat_priv: the bat priv with all the soft interface information
303 * @vid: the VLAN identifier
304 * @v: the amount to sum to the global table size
306 static void batadv_tt_global_size_mod(struct batadv_orig_node
*orig_node
,
307 unsigned short vid
, int v
)
309 struct batadv_orig_node_vlan
*vlan
;
311 vlan
= batadv_orig_node_vlan_new(orig_node
, vid
);
315 if (atomic_add_return(v
, &vlan
->tt
.num_entries
) == 0) {
316 spin_lock_bh(&orig_node
->vlan_list_lock
);
317 list_del_rcu(&vlan
->list
);
318 spin_unlock_bh(&orig_node
->vlan_list_lock
);
319 batadv_orig_node_vlan_free_ref(vlan
);
322 batadv_orig_node_vlan_free_ref(vlan
);
326 * batadv_tt_global_size_inc - increase by one the global table size for the
328 * @orig_node: the originator which global table size has to be decreased
329 * @vid: the vlan identifier
331 static void batadv_tt_global_size_inc(struct batadv_orig_node
*orig_node
,
334 batadv_tt_global_size_mod(orig_node
, vid
, 1);
338 * batadv_tt_global_size_dec - decrease by one the global table size for the
340 * @orig_node: the originator which global table size has to be decreased
341 * @vid: the vlan identifier
343 static void batadv_tt_global_size_dec(struct batadv_orig_node
*orig_node
,
346 batadv_tt_global_size_mod(orig_node
, vid
, -1);
350 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry
*orig_entry
)
352 if (!atomic_dec_and_test(&orig_entry
->refcount
))
355 call_rcu(&orig_entry
->rcu
, batadv_tt_orig_list_entry_free_rcu
);
359 * batadv_tt_local_event - store a local TT event (ADD/DEL)
360 * @bat_priv: the bat priv with all the soft interface information
361 * @tt_local_entry: the TT entry involved in the event
362 * @event_flags: flags to store in the event structure
364 static void batadv_tt_local_event(struct batadv_priv
*bat_priv
,
365 struct batadv_tt_local_entry
*tt_local_entry
,
368 struct batadv_tt_change_node
*tt_change_node
, *entry
, *safe
;
369 struct batadv_tt_common_entry
*common
= &tt_local_entry
->common
;
370 uint8_t flags
= common
->flags
| event_flags
;
371 bool event_removed
= false;
372 bool del_op_requested
, del_op_entry
;
374 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
378 tt_change_node
->change
.flags
= flags
;
379 memset(tt_change_node
->change
.reserved
, 0,
380 sizeof(tt_change_node
->change
.reserved
));
381 ether_addr_copy(tt_change_node
->change
.addr
, common
->addr
);
382 tt_change_node
->change
.vid
= htons(common
->vid
);
384 del_op_requested
= flags
& BATADV_TT_CLIENT_DEL
;
386 /* check for ADD+DEL or DEL+ADD events */
387 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
388 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
390 if (!batadv_compare_eth(entry
->change
.addr
, common
->addr
))
393 /* DEL+ADD in the same orig interval have no effect and can be
394 * removed to avoid silly behaviour on the receiver side. The
395 * other way around (ADD+DEL) can happen in case of roaming of
396 * a client still in the NEW state. Roaming of NEW clients is
397 * now possible due to automatically recognition of "temporary"
400 del_op_entry
= entry
->change
.flags
& BATADV_TT_CLIENT_DEL
;
401 if (!del_op_requested
&& del_op_entry
)
403 if (del_op_requested
&& !del_op_entry
)
406 /* this is a second add in the same originator interval. It
407 * means that flags have been changed: update them!
409 if (!del_op_requested
&& !del_op_entry
)
410 entry
->change
.flags
= flags
;
414 list_del(&entry
->list
);
416 kfree(tt_change_node
);
417 event_removed
= true;
421 /* track the change in the OGMinterval list */
422 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
425 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
428 atomic_dec(&bat_priv
->tt
.local_changes
);
430 atomic_inc(&bat_priv
->tt
.local_changes
);
434 * batadv_tt_len - compute length in bytes of given number of tt changes
435 * @changes_num: number of tt changes
437 * Returns computed length in bytes.
439 static int batadv_tt_len(int changes_num
)
441 return changes_num
* sizeof(struct batadv_tvlv_tt_change
);
445 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
446 * @tt_len: available space
448 * Returns the number of entries.
450 static uint16_t batadv_tt_entries(uint16_t tt_len
)
452 return tt_len
/ batadv_tt_len(1);
456 * batadv_tt_local_table_transmit_size - calculates the local translation table
457 * size when transmitted over the air
458 * @bat_priv: the bat priv with all the soft interface information
460 * Returns local translation table size in bytes.
462 static int batadv_tt_local_table_transmit_size(struct batadv_priv
*bat_priv
)
464 uint16_t num_vlan
= 0, tt_local_entries
= 0;
465 struct batadv_softif_vlan
*vlan
;
469 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
471 tt_local_entries
+= atomic_read(&vlan
->tt
.num_entries
);
475 /* header size of tvlv encapsulated tt response payload */
476 hdr_size
= sizeof(struct batadv_unicast_tvlv_packet
);
477 hdr_size
+= sizeof(struct batadv_tvlv_hdr
);
478 hdr_size
+= sizeof(struct batadv_tvlv_tt_data
);
479 hdr_size
+= num_vlan
* sizeof(struct batadv_tvlv_tt_vlan_data
);
481 return hdr_size
+ batadv_tt_len(tt_local_entries
);
484 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
486 if (bat_priv
->tt
.local_hash
)
489 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
491 if (!bat_priv
->tt
.local_hash
)
494 batadv_hash_set_lock_class(bat_priv
->tt
.local_hash
,
495 &batadv_tt_local_hash_lock_class_key
);
500 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
501 struct batadv_tt_global_entry
*tt_global
,
504 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
505 "Deleting global tt entry %pM (vid: %d): %s\n",
506 tt_global
->common
.addr
,
507 BATADV_PRINT_VID(tt_global
->common
.vid
), message
);
509 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
510 batadv_choose_tt
, &tt_global
->common
);
511 batadv_tt_global_entry_free_ref(tt_global
);
515 * batadv_tt_local_add - add a new client to the local table or update an
517 * @soft_iface: netdev struct of the mesh interface
518 * @addr: the mac address of the client to add
519 * @vid: VLAN identifier
520 * @ifindex: index of the interface where the client is connected to (useful to
521 * identify wireless clients)
522 * @mark: the value contained in the skb->mark field of the received packet (if
525 * Returns true if the client was successfully added, false otherwise.
527 bool batadv_tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
528 unsigned short vid
, int ifindex
, uint32_t mark
)
530 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
531 struct batadv_tt_local_entry
*tt_local
;
532 struct batadv_tt_global_entry
*tt_global
= NULL
;
533 struct batadv_softif_vlan
*vlan
;
534 struct net_device
*in_dev
= NULL
;
535 struct hlist_head
*head
;
536 struct batadv_tt_orig_list_entry
*orig_entry
;
537 int hash_added
, table_size
, packet_size_max
;
538 bool ret
= false, roamed_back
= false;
539 uint8_t remote_flags
;
542 if (ifindex
!= BATADV_NULL_IFINDEX
)
543 in_dev
= dev_get_by_index(&init_net
, ifindex
);
545 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
547 if (!is_multicast_ether_addr(addr
))
548 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
551 tt_local
->last_seen
= jiffies
;
552 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
553 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
554 "Re-adding pending client %pM (vid: %d)\n",
555 addr
, BATADV_PRINT_VID(vid
));
556 /* whatever the reason why the PENDING flag was set,
557 * this is a client which was enqueued to be removed in
558 * this orig_interval. Since it popped up again, the
559 * flag can be reset like it was never enqueued
561 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
565 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
566 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
567 "Roaming client %pM (vid: %d) came back to its original location\n",
568 addr
, BATADV_PRINT_VID(vid
));
569 /* the ROAM flag is set because this client roamed away
570 * and the node got a roaming_advertisement message. Now
571 * that the client popped up again at its original
572 * location such flag can be unset
574 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
580 /* Ignore the client if we cannot send it in a full table response. */
581 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
582 table_size
+= batadv_tt_len(1);
583 packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
584 if (table_size
> packet_size_max
) {
585 net_ratelimited_function(batadv_info
, soft_iface
,
586 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
587 table_size
, packet_size_max
, addr
);
591 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
595 /* increase the refcounter of the related vlan */
596 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
598 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
599 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
600 addr
, BATADV_PRINT_VID(vid
),
601 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
603 ether_addr_copy(tt_local
->common
.addr
, addr
);
604 /* The local entry has to be marked as NEW to avoid to send it in
605 * a full table response going out before the next ttvn increment
606 * (consistency check)
608 tt_local
->common
.flags
= BATADV_TT_CLIENT_NEW
;
609 tt_local
->common
.vid
= vid
;
610 if (batadv_is_wifi_netdev(in_dev
))
611 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
612 atomic_set(&tt_local
->common
.refcount
, 2);
613 tt_local
->last_seen
= jiffies
;
614 tt_local
->common
.added_at
= tt_local
->last_seen
;
616 /* the batman interface mac and multicast addresses should never be
619 if (batadv_compare_eth(addr
, soft_iface
->dev_addr
) ||
620 is_multicast_ether_addr(addr
))
621 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NOPURGE
;
623 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
624 batadv_choose_tt
, &tt_local
->common
,
625 &tt_local
->common
.hash_entry
);
627 if (unlikely(hash_added
!= 0)) {
628 /* remove the reference for the hash */
629 batadv_tt_local_entry_free_ref(tt_local
);
630 batadv_softif_vlan_free_ref(vlan
);
635 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
638 /* Check whether it is a roaming, but don't do anything if the roaming
639 * process has already been handled
641 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
642 /* These node are probably going to update their tt table */
643 head
= &tt_global
->orig_list
;
645 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
646 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
647 tt_global
->common
.vid
,
648 orig_entry
->orig_node
);
652 batadv_tt_global_free(bat_priv
, tt_global
,
656 /* The global entry has to be marked as ROAMING and
657 * has to be kept for consistency purpose
659 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
660 tt_global
->roam_at
= jiffies
;
664 /* store the current remote flags before altering them. This helps
665 * understanding is flags are changing or not
667 remote_flags
= tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
;
669 if (batadv_is_wifi_netdev(in_dev
))
670 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
672 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_WIFI
;
674 /* check the mark in the skb: if it's equal to the configured
675 * isolation_mark, it means the packet is coming from an isolated
678 match_mark
= (mark
& bat_priv
->isolation_mark_mask
);
679 if (bat_priv
->isolation_mark_mask
&&
680 match_mark
== bat_priv
->isolation_mark
)
681 tt_local
->common
.flags
|= BATADV_TT_CLIENT_ISOLA
;
683 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ISOLA
;
685 /* if any "dynamic" flag has been modified, resend an ADD event for this
686 * entry so that all the nodes can get the new flags
688 if (remote_flags
^ (tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
))
689 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
696 batadv_tt_local_entry_free_ref(tt_local
);
698 batadv_tt_global_entry_free_ref(tt_global
);
703 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
704 * within a TT Response directed to another node
705 * @orig_node: originator for which the TT data has to be prepared
706 * @tt_data: uninitialised pointer to the address of the TVLV buffer
707 * @tt_change: uninitialised pointer to the address of the area where the TT
708 * changed can be stored
709 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
710 * function reserves the amount of space needed to send the entire global TT
711 * table. In case of success the value is updated with the real amount of
714 * Allocate the needed amount of memory for the entire TT TVLV and write its
715 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
716 * objects, one per active VLAN served by the originator node.
718 * Return the size of the allocated buffer or 0 in case of failure.
721 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node
*orig_node
,
722 struct batadv_tvlv_tt_data
**tt_data
,
723 struct batadv_tvlv_tt_change
**tt_change
,
726 uint16_t num_vlan
= 0, num_entries
= 0, change_offset
, tvlv_len
;
727 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
728 struct batadv_orig_node_vlan
*vlan
;
729 uint8_t *tt_change_ptr
;
732 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
734 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
737 change_offset
= sizeof(**tt_data
);
738 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
740 /* if tt_len is negative, allocate the space needed by the full table */
742 *tt_len
= batadv_tt_len(num_entries
);
745 tvlv_len
+= change_offset
;
747 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
753 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
754 (*tt_data
)->ttvn
= atomic_read(&orig_node
->last_ttvn
);
755 (*tt_data
)->num_vlan
= htons(num_vlan
);
757 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
758 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
759 tt_vlan
->vid
= htons(vlan
->vid
);
760 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
765 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
766 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
774 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
776 * @bat_priv: the bat priv with all the soft interface information
777 * @tt_data: uninitialised pointer to the address of the TVLV buffer
778 * @tt_change: uninitialised pointer to the address of the area where the TT
779 * changes can be stored
780 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
781 * function reserves the amount of space needed to send the entire local TT
782 * table. In case of success the value is updated with the real amount of
785 * Allocate the needed amount of memory for the entire TT TVLV and write its
786 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
787 * objects, one per active VLAN.
789 * Return the size of the allocated buffer or 0 in case of failure.
792 batadv_tt_prepare_tvlv_local_data(struct batadv_priv
*bat_priv
,
793 struct batadv_tvlv_tt_data
**tt_data
,
794 struct batadv_tvlv_tt_change
**tt_change
,
797 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
798 struct batadv_softif_vlan
*vlan
;
799 uint16_t num_vlan
= 0, num_entries
= 0, tvlv_len
;
800 uint8_t *tt_change_ptr
;
804 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
806 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
809 change_offset
= sizeof(**tt_data
);
810 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
812 /* if tt_len is negative, allocate the space needed by the full table */
814 *tt_len
= batadv_tt_len(num_entries
);
817 tvlv_len
+= change_offset
;
819 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
825 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
826 (*tt_data
)->ttvn
= atomic_read(&bat_priv
->tt
.vn
);
827 (*tt_data
)->num_vlan
= htons(num_vlan
);
829 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
830 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
831 tt_vlan
->vid
= htons(vlan
->vid
);
832 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
837 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
838 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
846 * batadv_tt_tvlv_container_update - update the translation table tvlv container
847 * after local tt changes have been committed
848 * @bat_priv: the bat priv with all the soft interface information
850 static void batadv_tt_tvlv_container_update(struct batadv_priv
*bat_priv
)
852 struct batadv_tt_change_node
*entry
, *safe
;
853 struct batadv_tvlv_tt_data
*tt_data
;
854 struct batadv_tvlv_tt_change
*tt_change
;
855 int tt_diff_len
, tt_change_len
= 0;
856 int tt_diff_entries_num
= 0, tt_diff_entries_count
= 0;
859 tt_diff_entries_num
= atomic_read(&bat_priv
->tt
.local_changes
);
860 tt_diff_len
= batadv_tt_len(tt_diff_entries_num
);
862 /* if we have too many changes for one packet don't send any
863 * and wait for the tt table request which will be fragmented
865 if (tt_diff_len
> bat_priv
->soft_iface
->mtu
)
868 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
, &tt_data
,
869 &tt_change
, &tt_diff_len
);
873 tt_data
->flags
= BATADV_TT_OGM_DIFF
;
875 if (tt_diff_len
== 0)
876 goto container_register
;
878 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
879 atomic_set(&bat_priv
->tt
.local_changes
, 0);
881 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
883 if (tt_diff_entries_count
< tt_diff_entries_num
) {
884 memcpy(tt_change
+ tt_diff_entries_count
,
886 sizeof(struct batadv_tvlv_tt_change
));
887 tt_diff_entries_count
++;
889 list_del(&entry
->list
);
892 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
894 /* Keep the buffer for possible tt_request */
895 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
896 kfree(bat_priv
->tt
.last_changeset
);
897 bat_priv
->tt
.last_changeset_len
= 0;
898 bat_priv
->tt
.last_changeset
= NULL
;
899 tt_change_len
= batadv_tt_len(tt_diff_entries_count
);
900 /* check whether this new OGM has no changes due to size problems */
901 if (tt_diff_entries_count
> 0) {
902 /* if kmalloc() fails we will reply with the full table
903 * instead of providing the diff
905 bat_priv
->tt
.last_changeset
= kzalloc(tt_diff_len
, GFP_ATOMIC
);
906 if (bat_priv
->tt
.last_changeset
) {
907 memcpy(bat_priv
->tt
.last_changeset
,
908 tt_change
, tt_change_len
);
909 bat_priv
->tt
.last_changeset_len
= tt_diff_len
;
912 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
915 batadv_tvlv_container_register(bat_priv
, BATADV_TVLV_TT
, 1, tt_data
,
920 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
922 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
923 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
924 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
925 struct batadv_tt_common_entry
*tt_common_entry
;
926 struct batadv_tt_local_entry
*tt_local
;
927 struct batadv_hard_iface
*primary_if
;
928 struct batadv_softif_vlan
*vlan
;
929 struct hlist_head
*head
;
934 unsigned long last_seen_jiffies
;
936 uint16_t np_flag
= BATADV_TT_CLIENT_NOPURGE
;
938 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
943 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
944 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
945 seq_printf(seq
, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
946 "Flags", "Last seen", "CRC");
948 for (i
= 0; i
< hash
->size
; i
++) {
949 head
= &hash
->table
[i
];
952 hlist_for_each_entry_rcu(tt_common_entry
,
954 tt_local
= container_of(tt_common_entry
,
955 struct batadv_tt_local_entry
,
957 vid
= tt_common_entry
->vid
;
958 last_seen_jiffies
= jiffies
- tt_local
->last_seen
;
959 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
960 last_seen_secs
= last_seen_msecs
/ 1000;
961 last_seen_msecs
= last_seen_msecs
% 1000;
963 no_purge
= tt_common_entry
->flags
& np_flag
;
965 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
967 seq_printf(seq
, "Cannot retrieve VLAN %d\n",
968 BATADV_PRINT_VID(vid
));
973 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
974 tt_common_entry
->addr
,
975 BATADV_PRINT_VID(tt_common_entry
->vid
),
976 ((tt_common_entry
->flags
&
977 BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
978 no_purge
? 'P' : '.',
979 ((tt_common_entry
->flags
&
980 BATADV_TT_CLIENT_NEW
) ? 'N' : '.'),
981 ((tt_common_entry
->flags
&
982 BATADV_TT_CLIENT_PENDING
) ? 'X' : '.'),
983 ((tt_common_entry
->flags
&
984 BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
985 ((tt_common_entry
->flags
&
986 BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
987 no_purge
? 0 : last_seen_secs
,
988 no_purge
? 0 : last_seen_msecs
,
991 batadv_softif_vlan_free_ref(vlan
);
997 batadv_hardif_free_ref(primary_if
);
1002 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
1003 struct batadv_tt_local_entry
*tt_local_entry
,
1004 uint16_t flags
, const char *message
)
1006 batadv_tt_local_event(bat_priv
, tt_local_entry
, flags
);
1008 /* The local client has to be marked as "pending to be removed" but has
1009 * to be kept in the table in order to send it in a full table
1010 * response issued before the net ttvn increment (consistency check)
1012 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
1014 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1015 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1016 tt_local_entry
->common
.addr
,
1017 BATADV_PRINT_VID(tt_local_entry
->common
.vid
), message
);
1021 * batadv_tt_local_remove - logically remove an entry from the local table
1022 * @bat_priv: the bat priv with all the soft interface information
1023 * @addr: the MAC address of the client to remove
1024 * @vid: VLAN identifier
1025 * @message: message to append to the log on deletion
1026 * @roaming: true if the deletion is due to a roaming event
1028 * Returns the flags assigned to the local entry before being deleted
1030 uint16_t batadv_tt_local_remove(struct batadv_priv
*bat_priv
,
1031 const uint8_t *addr
, unsigned short vid
,
1032 const char *message
, bool roaming
)
1034 struct batadv_tt_local_entry
*tt_local_entry
;
1035 uint16_t flags
, curr_flags
= BATADV_NO_FLAGS
;
1036 struct batadv_softif_vlan
*vlan
;
1038 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
1039 if (!tt_local_entry
)
1042 curr_flags
= tt_local_entry
->common
.flags
;
1044 flags
= BATADV_TT_CLIENT_DEL
;
1045 /* if this global entry addition is due to a roaming, the node has to
1046 * mark the local entry as "roamed" in order to correctly reroute
1050 flags
|= BATADV_TT_CLIENT_ROAM
;
1051 /* mark the local client as ROAMed */
1052 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1055 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
1056 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
1060 /* if this client has been added right now, it is possible to
1061 * immediately purge it
1063 batadv_tt_local_event(bat_priv
, tt_local_entry
, BATADV_TT_CLIENT_DEL
);
1064 hlist_del_rcu(&tt_local_entry
->common
.hash_entry
);
1065 batadv_tt_local_entry_free_ref(tt_local_entry
);
1067 /* decrease the reference held for this vlan */
1068 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1069 batadv_softif_vlan_free_ref(vlan
);
1070 batadv_softif_vlan_free_ref(vlan
);
1074 batadv_tt_local_entry_free_ref(tt_local_entry
);
1080 * batadv_tt_local_purge_list - purge inactive tt local entries
1081 * @bat_priv: the bat priv with all the soft interface information
1082 * @head: pointer to the list containing the local tt entries
1083 * @timeout: parameter deciding whether a given tt local entry is considered
1086 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
1087 struct hlist_head
*head
,
1090 struct batadv_tt_local_entry
*tt_local_entry
;
1091 struct batadv_tt_common_entry
*tt_common_entry
;
1092 struct hlist_node
*node_tmp
;
1094 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
, head
,
1096 tt_local_entry
= container_of(tt_common_entry
,
1097 struct batadv_tt_local_entry
,
1099 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
1102 /* entry already marked for deletion */
1103 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
1106 if (!batadv_has_timed_out(tt_local_entry
->last_seen
, timeout
))
1109 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
1110 BATADV_TT_CLIENT_DEL
, "timed out");
1115 * batadv_tt_local_purge - purge inactive tt local entries
1116 * @bat_priv: the bat priv with all the soft interface information
1117 * @timeout: parameter deciding whether a given tt local entry is considered
1120 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
,
1123 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1124 struct hlist_head
*head
;
1125 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1128 for (i
= 0; i
< hash
->size
; i
++) {
1129 head
= &hash
->table
[i
];
1130 list_lock
= &hash
->list_locks
[i
];
1132 spin_lock_bh(list_lock
);
1133 batadv_tt_local_purge_list(bat_priv
, head
, timeout
);
1134 spin_unlock_bh(list_lock
);
1138 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
1140 struct batadv_hashtable
*hash
;
1141 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1142 struct batadv_tt_common_entry
*tt_common_entry
;
1143 struct batadv_tt_local_entry
*tt_local
;
1144 struct batadv_softif_vlan
*vlan
;
1145 struct hlist_node
*node_tmp
;
1146 struct hlist_head
*head
;
1149 if (!bat_priv
->tt
.local_hash
)
1152 hash
= bat_priv
->tt
.local_hash
;
1154 for (i
= 0; i
< hash
->size
; i
++) {
1155 head
= &hash
->table
[i
];
1156 list_lock
= &hash
->list_locks
[i
];
1158 spin_lock_bh(list_lock
);
1159 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1161 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1162 tt_local
= container_of(tt_common_entry
,
1163 struct batadv_tt_local_entry
,
1166 /* decrease the reference held for this vlan */
1167 vlan
= batadv_softif_vlan_get(bat_priv
,
1168 tt_common_entry
->vid
);
1169 batadv_softif_vlan_free_ref(vlan
);
1170 batadv_softif_vlan_free_ref(vlan
);
1172 batadv_tt_local_entry_free_ref(tt_local
);
1174 spin_unlock_bh(list_lock
);
1177 batadv_hash_destroy(hash
);
1179 bat_priv
->tt
.local_hash
= NULL
;
1182 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
1184 if (bat_priv
->tt
.global_hash
)
1187 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
1189 if (!bat_priv
->tt
.global_hash
)
1192 batadv_hash_set_lock_class(bat_priv
->tt
.global_hash
,
1193 &batadv_tt_global_hash_lock_class_key
);
1198 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
1200 struct batadv_tt_change_node
*entry
, *safe
;
1202 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
1204 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
1206 list_del(&entry
->list
);
1210 atomic_set(&bat_priv
->tt
.local_changes
, 0);
1211 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
1214 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1215 * batadv_tt_global_entry list
1217 * returns it with an increased refcounter, NULL if not found
1219 static struct batadv_tt_orig_list_entry
*
1220 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
1221 const struct batadv_orig_node
*orig_node
)
1223 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
1224 const struct hlist_head
*head
;
1227 head
= &entry
->orig_list
;
1228 hlist_for_each_entry_rcu(tmp_orig_entry
, head
, list
) {
1229 if (tmp_orig_entry
->orig_node
!= orig_node
)
1231 if (!atomic_inc_not_zero(&tmp_orig_entry
->refcount
))
1234 orig_entry
= tmp_orig_entry
;
1242 /* find out if an orig_node is already in the list of a tt_global_entry.
1243 * returns true if found, false otherwise
1246 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
1247 const struct batadv_orig_node
*orig_node
)
1249 struct batadv_tt_orig_list_entry
*orig_entry
;
1252 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
1255 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1262 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
1263 struct batadv_orig_node
*orig_node
, int ttvn
)
1265 struct batadv_tt_orig_list_entry
*orig_entry
;
1267 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
1269 /* refresh the ttvn: the current value could be a bogus one that
1270 * was added during a "temporary client detection"
1272 orig_entry
->ttvn
= ttvn
;
1276 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
1280 INIT_HLIST_NODE(&orig_entry
->list
);
1281 atomic_inc(&orig_node
->refcount
);
1282 batadv_tt_global_size_inc(orig_node
, tt_global
->common
.vid
);
1283 orig_entry
->orig_node
= orig_node
;
1284 orig_entry
->ttvn
= ttvn
;
1285 atomic_set(&orig_entry
->refcount
, 2);
1287 spin_lock_bh(&tt_global
->list_lock
);
1288 hlist_add_head_rcu(&orig_entry
->list
,
1289 &tt_global
->orig_list
);
1290 spin_unlock_bh(&tt_global
->list_lock
);
1291 atomic_inc(&tt_global
->orig_list_count
);
1295 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1299 * batadv_tt_global_add - add a new TT global entry or update an existing one
1300 * @bat_priv: the bat priv with all the soft interface information
1301 * @orig_node: the originator announcing the client
1302 * @tt_addr: the mac address of the non-mesh client
1303 * @vid: VLAN identifier
1304 * @flags: TT flags that have to be set for this non-mesh client
1305 * @ttvn: the tt version number ever announcing this non-mesh client
1307 * Add a new TT global entry for the given originator. If the entry already
1308 * exists add a new reference to the given originator (a global entry can have
1309 * references to multiple originators) and adjust the flags attribute to reflect
1310 * the function argument.
1311 * If a TT local entry exists for this non-mesh client remove it.
1313 * The caller must hold orig_node refcount.
1315 * Return true if the new entry has been added, false otherwise
1317 static bool batadv_tt_global_add(struct batadv_priv
*bat_priv
,
1318 struct batadv_orig_node
*orig_node
,
1319 const unsigned char *tt_addr
,
1320 unsigned short vid
, uint16_t flags
,
1323 struct batadv_tt_global_entry
*tt_global_entry
;
1324 struct batadv_tt_local_entry
*tt_local_entry
;
1327 struct batadv_tt_common_entry
*common
;
1328 uint16_t local_flags
;
1330 /* ignore global entries from backbone nodes */
1331 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
, vid
))
1334 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
, vid
);
1335 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
, vid
);
1337 /* if the node already has a local client for this entry, it has to wait
1338 * for a roaming advertisement instead of manually messing up the global
1341 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
1342 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
1345 if (!tt_global_entry
) {
1346 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
1347 if (!tt_global_entry
)
1350 common
= &tt_global_entry
->common
;
1351 ether_addr_copy(common
->addr
, tt_addr
);
1354 common
->flags
= flags
;
1355 tt_global_entry
->roam_at
= 0;
1356 /* node must store current time in case of roaming. This is
1357 * needed to purge this entry out on timeout (if nobody claims
1360 if (flags
& BATADV_TT_CLIENT_ROAM
)
1361 tt_global_entry
->roam_at
= jiffies
;
1362 atomic_set(&common
->refcount
, 2);
1363 common
->added_at
= jiffies
;
1365 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
1366 atomic_set(&tt_global_entry
->orig_list_count
, 0);
1367 spin_lock_init(&tt_global_entry
->list_lock
);
1369 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
1371 batadv_choose_tt
, common
,
1372 &common
->hash_entry
);
1374 if (unlikely(hash_added
!= 0)) {
1375 /* remove the reference for the hash */
1376 batadv_tt_global_entry_free_ref(tt_global_entry
);
1380 common
= &tt_global_entry
->common
;
1381 /* If there is already a global entry, we can use this one for
1383 * But if we are trying to add a temporary client then here are
1384 * two options at this point:
1385 * 1) the global client is not a temporary client: the global
1386 * client has to be left as it is, temporary information
1387 * should never override any already known client state
1388 * 2) the global client is a temporary client: purge the
1389 * originator list and add the new one orig_entry
1391 if (flags
& BATADV_TT_CLIENT_TEMP
) {
1392 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
1394 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
1397 batadv_tt_global_del_orig_list(tt_global_entry
);
1398 goto add_orig_entry
;
1401 /* if the client was temporary added before receiving the first
1402 * OGM announcing it, we have to clear the TEMP flag
1404 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
1406 /* the change can carry possible "attribute" flags like the
1407 * TT_CLIENT_WIFI, therefore they have to be copied in the
1410 tt_global_entry
->common
.flags
|= flags
;
1412 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1413 * one originator left in the list and we previously received a
1414 * delete + roaming change for this originator.
1416 * We should first delete the old originator before adding the
1419 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
1420 batadv_tt_global_del_orig_list(tt_global_entry
);
1421 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
1422 tt_global_entry
->roam_at
= 0;
1426 /* add the new orig_entry (if needed) or update it */
1427 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
1429 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1430 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1431 common
->addr
, BATADV_PRINT_VID(common
->vid
),
1436 /* Do not remove multicast addresses from the local hash on
1439 if (is_multicast_ether_addr(tt_addr
))
1442 /* remove address from local hash if present */
1443 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
, vid
,
1444 "global tt received",
1445 flags
& BATADV_TT_CLIENT_ROAM
);
1446 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
1448 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
1449 /* this is a normal global add. Therefore the client is not in a
1450 * roaming state anymore.
1452 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
1455 if (tt_global_entry
)
1456 batadv_tt_global_entry_free_ref(tt_global_entry
);
1458 batadv_tt_local_entry_free_ref(tt_local_entry
);
1463 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1464 * @bat_priv: the bat priv with all the soft interface information
1465 * @tt_global_entry: global translation table entry to be analyzed
1467 * This functon assumes the caller holds rcu_read_lock().
1468 * Returns best originator list entry or NULL on errors.
1470 static struct batadv_tt_orig_list_entry
*
1471 batadv_transtable_best_orig(struct batadv_priv
*bat_priv
,
1472 struct batadv_tt_global_entry
*tt_global_entry
)
1474 struct batadv_neigh_node
*router
, *best_router
= NULL
;
1475 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
1476 struct hlist_head
*head
;
1477 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
1479 head
= &tt_global_entry
->orig_list
;
1480 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1481 router
= batadv_orig_router_get(orig_entry
->orig_node
,
1487 bao
->bat_neigh_cmp(router
, BATADV_IF_DEFAULT
,
1488 best_router
, BATADV_IF_DEFAULT
) <= 0) {
1489 batadv_neigh_node_free_ref(router
);
1493 /* release the refcount for the "old" best */
1495 batadv_neigh_node_free_ref(best_router
);
1497 best_entry
= orig_entry
;
1498 best_router
= router
;
1502 batadv_neigh_node_free_ref(best_router
);
1508 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1509 * for this global entry
1510 * @bat_priv: the bat priv with all the soft interface information
1511 * @tt_global_entry: global translation table entry to be printed
1512 * @seq: debugfs table seq_file struct
1514 * This functon assumes the caller holds rcu_read_lock().
1517 batadv_tt_global_print_entry(struct batadv_priv
*bat_priv
,
1518 struct batadv_tt_global_entry
*tt_global_entry
,
1519 struct seq_file
*seq
)
1521 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
1522 struct batadv_tt_common_entry
*tt_common_entry
;
1523 struct batadv_orig_node_vlan
*vlan
;
1524 struct hlist_head
*head
;
1528 tt_common_entry
= &tt_global_entry
->common
;
1529 flags
= tt_common_entry
->flags
;
1531 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1533 vlan
= batadv_orig_node_vlan_get(best_entry
->orig_node
,
1534 tt_common_entry
->vid
);
1537 " * Cannot retrieve VLAN %d for originator %pM\n",
1538 BATADV_PRINT_VID(tt_common_entry
->vid
),
1539 best_entry
->orig_node
->orig
);
1543 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
1545 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1546 '*', tt_global_entry
->common
.addr
,
1547 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1548 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
1549 last_ttvn
, vlan
->tt
.crc
,
1550 ((flags
& BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
1551 ((flags
& BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
1552 ((flags
& BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
1553 ((flags
& BATADV_TT_CLIENT_TEMP
) ? 'T' : '.'));
1555 batadv_orig_node_vlan_free_ref(vlan
);
1559 head
= &tt_global_entry
->orig_list
;
1561 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1562 if (best_entry
== orig_entry
)
1565 vlan
= batadv_orig_node_vlan_get(orig_entry
->orig_node
,
1566 tt_common_entry
->vid
);
1569 " + Cannot retrieve VLAN %d for originator %pM\n",
1570 BATADV_PRINT_VID(tt_common_entry
->vid
),
1571 orig_entry
->orig_node
->orig
);
1575 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
1577 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1578 '+', tt_global_entry
->common
.addr
,
1579 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1580 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1581 last_ttvn
, vlan
->tt
.crc
,
1582 ((flags
& BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
1583 ((flags
& BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
1584 ((flags
& BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
1585 ((flags
& BATADV_TT_CLIENT_TEMP
) ? 'T' : '.'));
1587 batadv_orig_node_vlan_free_ref(vlan
);
1591 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1593 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1594 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1595 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1596 struct batadv_tt_common_entry
*tt_common_entry
;
1597 struct batadv_tt_global_entry
*tt_global
;
1598 struct batadv_hard_iface
*primary_if
;
1599 struct hlist_head
*head
;
1602 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1607 "Globally announced TT entries received via the mesh %s\n",
1609 seq_printf(seq
, " %-13s %s %s %-15s %s (%-10s) %s\n",
1610 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1613 for (i
= 0; i
< hash
->size
; i
++) {
1614 head
= &hash
->table
[i
];
1617 hlist_for_each_entry_rcu(tt_common_entry
,
1619 tt_global
= container_of(tt_common_entry
,
1620 struct batadv_tt_global_entry
,
1622 batadv_tt_global_print_entry(bat_priv
, tt_global
, seq
);
1628 batadv_hardif_free_ref(primary_if
);
1633 * batadv_tt_global_del_orig_entry - remove and free an orig_entry
1634 * @tt_global_entry: the global entry to remove the orig_entry from
1635 * @orig_entry: the orig entry to remove and free
1637 * Remove an orig_entry from its list in the given tt_global_entry and
1638 * free this orig_entry afterwards.
1641 batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry
*tt_global_entry
,
1642 struct batadv_tt_orig_list_entry
*orig_entry
)
1644 batadv_tt_global_size_dec(orig_entry
->orig_node
,
1645 tt_global_entry
->common
.vid
);
1646 atomic_dec(&tt_global_entry
->orig_list_count
);
1647 hlist_del_rcu(&orig_entry
->list
);
1648 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1651 /* deletes the orig list of a tt_global_entry */
1653 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1655 struct hlist_head
*head
;
1656 struct hlist_node
*safe
;
1657 struct batadv_tt_orig_list_entry
*orig_entry
;
1659 spin_lock_bh(&tt_global_entry
->list_lock
);
1660 head
= &tt_global_entry
->orig_list
;
1661 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
)
1662 batadv_tt_global_del_orig_entry(tt_global_entry
, orig_entry
);
1663 spin_unlock_bh(&tt_global_entry
->list_lock
);
1667 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1668 * @bat_priv: the bat priv with all the soft interface information
1669 * @tt_global_entry: the global entry to remove the orig_node from
1670 * @orig_node: the originator announcing the client
1671 * @message: message to append to the log on deletion
1673 * Remove the given orig_node and its according orig_entry from the given
1677 batadv_tt_global_del_orig_node(struct batadv_priv
*bat_priv
,
1678 struct batadv_tt_global_entry
*tt_global_entry
,
1679 struct batadv_orig_node
*orig_node
,
1680 const char *message
)
1682 struct hlist_head
*head
;
1683 struct hlist_node
*safe
;
1684 struct batadv_tt_orig_list_entry
*orig_entry
;
1687 spin_lock_bh(&tt_global_entry
->list_lock
);
1688 head
= &tt_global_entry
->orig_list
;
1689 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1690 if (orig_entry
->orig_node
== orig_node
) {
1691 vid
= tt_global_entry
->common
.vid
;
1692 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1693 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1695 tt_global_entry
->common
.addr
,
1696 BATADV_PRINT_VID(vid
), message
);
1697 batadv_tt_global_del_orig_entry(tt_global_entry
,
1701 spin_unlock_bh(&tt_global_entry
->list_lock
);
1704 /* If the client is to be deleted, we check if it is the last origantor entry
1705 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1706 * timer, otherwise we simply remove the originator scheduled for deletion.
1709 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1710 struct batadv_tt_global_entry
*tt_global_entry
,
1711 struct batadv_orig_node
*orig_node
,
1712 const char *message
)
1714 bool last_entry
= true;
1715 struct hlist_head
*head
;
1716 struct batadv_tt_orig_list_entry
*orig_entry
;
1718 /* no local entry exists, case 1:
1719 * Check if this is the last one or if other entries exist.
1723 head
= &tt_global_entry
->orig_list
;
1724 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1725 if (orig_entry
->orig_node
!= orig_node
) {
1733 /* its the last one, mark for roaming. */
1734 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1735 tt_global_entry
->roam_at
= jiffies
;
1737 /* there is another entry, we can simply delete this
1738 * one and can still use the other one.
1740 batadv_tt_global_del_orig_node(bat_priv
, tt_global_entry
,
1741 orig_node
, message
);
1745 * batadv_tt_global_del - remove a client from the global table
1746 * @bat_priv: the bat priv with all the soft interface information
1747 * @orig_node: an originator serving this client
1748 * @addr: the mac address of the client
1749 * @vid: VLAN identifier
1750 * @message: a message explaining the reason for deleting the client to print
1751 * for debugging purpose
1752 * @roaming: true if the deletion has been triggered by a roaming event
1754 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1755 struct batadv_orig_node
*orig_node
,
1756 const unsigned char *addr
, unsigned short vid
,
1757 const char *message
, bool roaming
)
1759 struct batadv_tt_global_entry
*tt_global_entry
;
1760 struct batadv_tt_local_entry
*local_entry
= NULL
;
1762 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1763 if (!tt_global_entry
)
1767 batadv_tt_global_del_orig_node(bat_priv
, tt_global_entry
,
1768 orig_node
, message
);
1770 if (hlist_empty(&tt_global_entry
->orig_list
))
1771 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1777 /* if we are deleting a global entry due to a roam
1778 * event, there are two possibilities:
1779 * 1) the client roamed from node A to node B => if there
1780 * is only one originator left for this client, we mark
1781 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1782 * wait for node B to claim it. In case of timeout
1783 * the entry is purged.
1785 * If there are other originators left, we directly delete
1787 * 2) the client roamed to us => we can directly delete
1788 * the global entry, since it is useless now.
1790 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1791 tt_global_entry
->common
.addr
,
1794 /* local entry exists, case 2: client roamed to us. */
1795 batadv_tt_global_del_orig_list(tt_global_entry
);
1796 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1798 /* no local entry exists, case 1: check for roaming */
1799 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1800 orig_node
, message
);
1803 if (tt_global_entry
)
1804 batadv_tt_global_entry_free_ref(tt_global_entry
);
1806 batadv_tt_local_entry_free_ref(local_entry
);
1810 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1811 * given originator matching the provided vid
1812 * @bat_priv: the bat priv with all the soft interface information
1813 * @orig_node: the originator owning the entries to remove
1814 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1816 * @message: debug message to print as "reason"
1818 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1819 struct batadv_orig_node
*orig_node
,
1821 const char *message
)
1823 struct batadv_tt_global_entry
*tt_global
;
1824 struct batadv_tt_common_entry
*tt_common_entry
;
1826 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1827 struct hlist_node
*safe
;
1828 struct hlist_head
*head
;
1829 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1835 for (i
= 0; i
< hash
->size
; i
++) {
1836 head
= &hash
->table
[i
];
1837 list_lock
= &hash
->list_locks
[i
];
1839 spin_lock_bh(list_lock
);
1840 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1842 /* remove only matching entries */
1843 if (match_vid
>= 0 && tt_common_entry
->vid
!= match_vid
)
1846 tt_global
= container_of(tt_common_entry
,
1847 struct batadv_tt_global_entry
,
1850 batadv_tt_global_del_orig_node(bat_priv
, tt_global
,
1851 orig_node
, message
);
1853 if (hlist_empty(&tt_global
->orig_list
)) {
1854 vid
= tt_global
->common
.vid
;
1855 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1856 "Deleting global tt entry %pM (vid: %d): %s\n",
1857 tt_global
->common
.addr
,
1858 BATADV_PRINT_VID(vid
), message
);
1859 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1860 batadv_tt_global_entry_free_ref(tt_global
);
1863 spin_unlock_bh(list_lock
);
1865 orig_node
->capa_initialized
&= ~BATADV_ORIG_CAPA_HAS_TT
;
1868 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1872 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1873 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1875 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1876 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1878 *msg
= "Roaming timeout\n";
1881 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1882 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1884 *msg
= "Temporary client timeout\n";
1890 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1892 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1893 struct hlist_head
*head
;
1894 struct hlist_node
*node_tmp
;
1895 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1898 struct batadv_tt_common_entry
*tt_common
;
1899 struct batadv_tt_global_entry
*tt_global
;
1901 for (i
= 0; i
< hash
->size
; i
++) {
1902 head
= &hash
->table
[i
];
1903 list_lock
= &hash
->list_locks
[i
];
1905 spin_lock_bh(list_lock
);
1906 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
1908 tt_global
= container_of(tt_common
,
1909 struct batadv_tt_global_entry
,
1912 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1915 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1916 "Deleting global tt entry %pM (vid: %d): %s\n",
1917 tt_global
->common
.addr
,
1918 BATADV_PRINT_VID(tt_global
->common
.vid
),
1921 hlist_del_rcu(&tt_common
->hash_entry
);
1923 batadv_tt_global_entry_free_ref(tt_global
);
1925 spin_unlock_bh(list_lock
);
1929 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1931 struct batadv_hashtable
*hash
;
1932 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1933 struct batadv_tt_common_entry
*tt_common_entry
;
1934 struct batadv_tt_global_entry
*tt_global
;
1935 struct hlist_node
*node_tmp
;
1936 struct hlist_head
*head
;
1939 if (!bat_priv
->tt
.global_hash
)
1942 hash
= bat_priv
->tt
.global_hash
;
1944 for (i
= 0; i
< hash
->size
; i
++) {
1945 head
= &hash
->table
[i
];
1946 list_lock
= &hash
->list_locks
[i
];
1948 spin_lock_bh(list_lock
);
1949 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1951 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1952 tt_global
= container_of(tt_common_entry
,
1953 struct batadv_tt_global_entry
,
1955 batadv_tt_global_entry_free_ref(tt_global
);
1957 spin_unlock_bh(list_lock
);
1960 batadv_hash_destroy(hash
);
1962 bat_priv
->tt
.global_hash
= NULL
;
1966 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
1967 struct batadv_tt_global_entry
*tt_global_entry
)
1971 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
1972 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
1975 /* check if the two clients are marked as isolated */
1976 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
&&
1977 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
)
1984 * batadv_transtable_search - get the mesh destination for a given client
1985 * @bat_priv: the bat priv with all the soft interface information
1986 * @src: mac address of the source client
1987 * @addr: mac address of the destination client
1988 * @vid: VLAN identifier
1990 * Returns a pointer to the originator that was selected as destination in the
1991 * mesh for contacting the client 'addr', NULL otherwise.
1992 * In case of multiple originators serving the same client, the function returns
1993 * the best one (best in terms of metric towards the destination node).
1995 * If the two clients are AP isolated the function returns NULL.
1997 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
1999 const uint8_t *addr
,
2002 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
2003 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
2004 struct batadv_orig_node
*orig_node
= NULL
;
2005 struct batadv_tt_orig_list_entry
*best_entry
;
2007 if (src
&& batadv_vlan_ap_isola_get(bat_priv
, vid
)) {
2008 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
, vid
);
2009 if (!tt_local_entry
||
2010 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
2014 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
2015 if (!tt_global_entry
)
2018 /* check whether the clients should not communicate due to AP
2021 if (tt_local_entry
&&
2022 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
2026 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
2027 /* found anything? */
2029 orig_node
= best_entry
->orig_node
;
2030 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
2035 if (tt_global_entry
)
2036 batadv_tt_global_entry_free_ref(tt_global_entry
);
2038 batadv_tt_local_entry_free_ref(tt_local_entry
);
2044 * batadv_tt_global_crc - calculates the checksum of the local table belonging
2045 * to the given orig_node
2046 * @bat_priv: the bat priv with all the soft interface information
2047 * @orig_node: originator for which the CRC should be computed
2048 * @vid: VLAN identifier for which the CRC32 has to be computed
2050 * This function computes the checksum for the global table corresponding to a
2051 * specific originator. In particular, the checksum is computed as follows: For
2052 * each client connected to the originator the CRC32C of the MAC address and the
2053 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2056 * The idea behind is that CRC32C should be used as much as possible in order to
2057 * produce a unique hash of the table, but since the order which is used to feed
2058 * the CRC32C function affects the result and since every node in the network
2059 * probably sorts the clients differently, the hash function cannot be directly
2060 * computed over the entire table. Hence the CRC32C is used only on
2061 * the single client entry, while all the results are then xor'ed together
2062 * because the XOR operation can combine them all while trying to reduce the
2063 * noise as much as possible.
2065 * Returns the checksum of the global table of a given originator.
2067 static uint32_t batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
2068 struct batadv_orig_node
*orig_node
,
2071 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
2072 struct batadv_tt_common_entry
*tt_common
;
2073 struct batadv_tt_global_entry
*tt_global
;
2074 struct hlist_head
*head
;
2075 uint32_t i
, crc_tmp
, crc
= 0;
2079 for (i
= 0; i
< hash
->size
; i
++) {
2080 head
= &hash
->table
[i
];
2083 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2084 tt_global
= container_of(tt_common
,
2085 struct batadv_tt_global_entry
,
2087 /* compute the CRC only for entries belonging to the
2088 * VLAN identified by the vid passed as parameter
2090 if (tt_common
->vid
!= vid
)
2093 /* Roaming clients are in the global table for
2094 * consistency only. They don't have to be
2095 * taken into account while computing the
2098 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
2100 /* Temporary clients have not been announced yet, so
2101 * they have to be skipped while computing the global
2104 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
2107 /* find out if this global entry is announced by this
2110 if (!batadv_tt_global_entry_has_orig(tt_global
,
2114 /* use network order to read the VID: this ensures that
2115 * every node reads the bytes in the same order.
2117 tmp_vid
= htons(tt_common
->vid
);
2118 crc_tmp
= crc32c(0, &tmp_vid
, sizeof(tmp_vid
));
2120 /* compute the CRC on flags that have to be kept in sync
2123 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2124 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2126 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2135 * batadv_tt_local_crc - calculates the checksum of the local table
2136 * @bat_priv: the bat priv with all the soft interface information
2137 * @vid: VLAN identifier for which the CRC32 has to be computed
2139 * For details about the computation, please refer to the documentation for
2140 * batadv_tt_global_crc().
2142 * Returns the checksum of the local table
2144 static uint32_t batadv_tt_local_crc(struct batadv_priv
*bat_priv
,
2147 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2148 struct batadv_tt_common_entry
*tt_common
;
2149 struct hlist_head
*head
;
2150 uint32_t i
, crc_tmp
, crc
= 0;
2154 for (i
= 0; i
< hash
->size
; i
++) {
2155 head
= &hash
->table
[i
];
2158 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2159 /* compute the CRC only for entries belonging to the
2160 * VLAN identified by vid
2162 if (tt_common
->vid
!= vid
)
2165 /* not yet committed clients have not to be taken into
2166 * account while computing the CRC
2168 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
2171 /* use network order to read the VID: this ensures that
2172 * every node reads the bytes in the same order.
2174 tmp_vid
= htons(tt_common
->vid
);
2175 crc_tmp
= crc32c(0, &tmp_vid
, sizeof(tmp_vid
));
2177 /* compute the CRC on flags that have to be kept in sync
2180 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2181 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2183 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2191 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
2193 struct batadv_tt_req_node
*node
, *safe
;
2195 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2197 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2198 list_del(&node
->list
);
2202 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2205 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
2206 struct batadv_orig_node
*orig_node
,
2207 const void *tt_buff
,
2208 uint16_t tt_buff_len
)
2210 /* Replace the old buffer only if I received something in the
2211 * last OGM (the OGM could carry no changes)
2213 spin_lock_bh(&orig_node
->tt_buff_lock
);
2214 if (tt_buff_len
> 0) {
2215 kfree(orig_node
->tt_buff
);
2216 orig_node
->tt_buff_len
= 0;
2217 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
2218 if (orig_node
->tt_buff
) {
2219 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
2220 orig_node
->tt_buff_len
= tt_buff_len
;
2223 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2226 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
2228 struct batadv_tt_req_node
*node
, *safe
;
2230 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2231 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2232 if (batadv_has_timed_out(node
->issued_at
,
2233 BATADV_TT_REQUEST_TIMEOUT
)) {
2234 list_del(&node
->list
);
2238 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2241 /* returns the pointer to the new tt_req_node struct if no request
2242 * has already been issued for this orig_node, NULL otherwise
2244 static struct batadv_tt_req_node
*
2245 batadv_new_tt_req_node(struct batadv_priv
*bat_priv
,
2246 struct batadv_orig_node
*orig_node
)
2248 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
2250 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2251 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
2252 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
2253 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
2254 BATADV_TT_REQUEST_TIMEOUT
))
2258 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
2262 ether_addr_copy(tt_req_node
->addr
, orig_node
->orig
);
2263 tt_req_node
->issued_at
= jiffies
;
2265 list_add(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
2267 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2272 * batadv_tt_local_valid - verify that given tt entry is a valid one
2273 * @entry_ptr: to be checked local tt entry
2274 * @data_ptr: not used but definition required to satisfy the callback prototype
2276 * Returns 1 if the entry is a valid, 0 otherwise.
2278 static int batadv_tt_local_valid(const void *entry_ptr
, const void *data_ptr
)
2280 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2282 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
2287 static int batadv_tt_global_valid(const void *entry_ptr
,
2288 const void *data_ptr
)
2290 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2291 const struct batadv_tt_global_entry
*tt_global_entry
;
2292 const struct batadv_orig_node
*orig_node
= data_ptr
;
2294 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
2295 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
2298 tt_global_entry
= container_of(tt_common_entry
,
2299 struct batadv_tt_global_entry
,
2302 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
2306 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2308 * @bat_priv: the bat priv with all the soft interface information
2309 * @hash: hash table containing the tt entries
2310 * @tt_len: expected tvlv tt data buffer length in number of bytes
2311 * @tvlv_buff: pointer to the buffer to fill with the TT data
2312 * @valid_cb: function to filter tt change entries
2313 * @cb_data: data passed to the filter function as argument
2315 static void batadv_tt_tvlv_generate(struct batadv_priv
*bat_priv
,
2316 struct batadv_hashtable
*hash
,
2317 void *tvlv_buff
, uint16_t tt_len
,
2318 int (*valid_cb
)(const void *, const void *),
2321 struct batadv_tt_common_entry
*tt_common_entry
;
2322 struct batadv_tvlv_tt_change
*tt_change
;
2323 struct hlist_head
*head
;
2324 uint16_t tt_tot
, tt_num_entries
= 0;
2327 tt_tot
= batadv_tt_entries(tt_len
);
2328 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_buff
;
2331 for (i
= 0; i
< hash
->size
; i
++) {
2332 head
= &hash
->table
[i
];
2334 hlist_for_each_entry_rcu(tt_common_entry
,
2336 if (tt_tot
== tt_num_entries
)
2339 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
2342 ether_addr_copy(tt_change
->addr
, tt_common_entry
->addr
);
2343 tt_change
->flags
= tt_common_entry
->flags
;
2344 tt_change
->vid
= htons(tt_common_entry
->vid
);
2345 memset(tt_change
->reserved
, 0,
2346 sizeof(tt_change
->reserved
));
2356 * batadv_tt_global_check_crc - check if all the CRCs are correct
2357 * @orig_node: originator for which the CRCs have to be checked
2358 * @tt_vlan: pointer to the first tvlv VLAN entry
2359 * @num_vlan: number of tvlv VLAN entries
2360 * @create: if true, create VLAN objects if not found
2362 * Return true if all the received CRCs match the locally stored ones, false
2365 static bool batadv_tt_global_check_crc(struct batadv_orig_node
*orig_node
,
2366 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2369 struct batadv_tvlv_tt_vlan_data
*tt_vlan_tmp
;
2370 struct batadv_orig_node_vlan
*vlan
;
2374 /* check if each received CRC matches the locally stored one */
2375 for (i
= 0; i
< num_vlan
; i
++) {
2376 tt_vlan_tmp
= tt_vlan
+ i
;
2378 /* if orig_node is a backbone node for this VLAN, don't check
2379 * the CRC as we ignore all the global entries over it
2381 if (batadv_bla_is_backbone_gw_orig(orig_node
->bat_priv
,
2383 ntohs(tt_vlan_tmp
->vid
)))
2386 vlan
= batadv_orig_node_vlan_get(orig_node
,
2387 ntohs(tt_vlan_tmp
->vid
));
2392 batadv_orig_node_vlan_free_ref(vlan
);
2394 if (crc
!= ntohl(tt_vlan_tmp
->crc
))
2402 * batadv_tt_local_update_crc - update all the local CRCs
2403 * @bat_priv: the bat priv with all the soft interface information
2405 static void batadv_tt_local_update_crc(struct batadv_priv
*bat_priv
)
2407 struct batadv_softif_vlan
*vlan
;
2409 /* recompute the global CRC for each VLAN */
2411 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
2412 vlan
->tt
.crc
= batadv_tt_local_crc(bat_priv
, vlan
->vid
);
2418 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2419 * @bat_priv: the bat priv with all the soft interface information
2420 * @orig_node: the orig_node for which the CRCs have to be updated
2422 static void batadv_tt_global_update_crc(struct batadv_priv
*bat_priv
,
2423 struct batadv_orig_node
*orig_node
)
2425 struct batadv_orig_node_vlan
*vlan
;
2428 /* recompute the global CRC for each VLAN */
2430 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
2431 /* if orig_node is a backbone node for this VLAN, don't compute
2432 * the CRC as we ignore all the global entries over it
2434 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
,
2438 crc
= batadv_tt_global_crc(bat_priv
, orig_node
, vlan
->vid
);
2445 * batadv_send_tt_request - send a TT Request message to a given node
2446 * @bat_priv: the bat priv with all the soft interface information
2447 * @dst_orig_node: the destination of the message
2448 * @ttvn: the version number that the source of the message is looking for
2449 * @tt_vlan: pointer to the first tvlv VLAN object to request
2450 * @num_vlan: number of tvlv VLAN entries
2451 * @full_table: ask for the entire translation table if true, while only for the
2452 * last TT diff otherwise
2454 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
2455 struct batadv_orig_node
*dst_orig_node
,
2457 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2458 uint16_t num_vlan
, bool full_table
)
2460 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2461 struct batadv_tt_req_node
*tt_req_node
= NULL
;
2462 struct batadv_tvlv_tt_vlan_data
*tt_vlan_req
;
2463 struct batadv_hard_iface
*primary_if
;
2467 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2471 /* The new tt_req will be issued only if I'm not waiting for a
2472 * reply from the same orig_node yet
2474 tt_req_node
= batadv_new_tt_req_node(bat_priv
, dst_orig_node
);
2478 size
= sizeof(*tvlv_tt_data
) + sizeof(*tt_vlan_req
) * num_vlan
;
2479 tvlv_tt_data
= kzalloc(size
, GFP_ATOMIC
);
2483 tvlv_tt_data
->flags
= BATADV_TT_REQUEST
;
2484 tvlv_tt_data
->ttvn
= ttvn
;
2485 tvlv_tt_data
->num_vlan
= htons(num_vlan
);
2487 /* send all the CRCs within the request. This is needed by intermediate
2488 * nodes to ensure they have the correct table before replying
2490 tt_vlan_req
= (struct batadv_tvlv_tt_vlan_data
*)(tvlv_tt_data
+ 1);
2491 for (i
= 0; i
< num_vlan
; i
++) {
2492 tt_vlan_req
->vid
= tt_vlan
->vid
;
2493 tt_vlan_req
->crc
= tt_vlan
->crc
;
2500 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2502 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
2503 dst_orig_node
->orig
, full_table
? 'F' : '.');
2505 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
2506 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2507 dst_orig_node
->orig
, BATADV_TVLV_TT
, 1,
2508 tvlv_tt_data
, size
);
2513 batadv_hardif_free_ref(primary_if
);
2514 if (ret
&& tt_req_node
) {
2515 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2516 list_del(&tt_req_node
->list
);
2517 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2520 kfree(tvlv_tt_data
);
2525 * batadv_send_other_tt_response - send reply to tt request concerning another
2526 * node's translation table
2527 * @bat_priv: the bat priv with all the soft interface information
2528 * @tt_data: tt data containing the tt request information
2529 * @req_src: mac address of tt request sender
2530 * @req_dst: mac address of tt request recipient
2532 * Returns true if tt request reply was sent, false otherwise.
2534 static bool batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
2535 struct batadv_tvlv_tt_data
*tt_data
,
2536 uint8_t *req_src
, uint8_t *req_dst
)
2538 struct batadv_orig_node
*req_dst_orig_node
;
2539 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
2540 struct batadv_tvlv_tt_change
*tt_change
;
2541 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2542 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
2543 bool ret
= false, full_table
;
2544 uint8_t orig_ttvn
, req_ttvn
;
2548 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2549 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2550 req_src
, tt_data
->ttvn
, req_dst
,
2551 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
2553 /* Let's get the orig node of the REAL destination */
2554 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_dst
);
2555 if (!req_dst_orig_node
)
2558 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2559 if (!res_dst_orig_node
)
2562 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
2563 req_ttvn
= tt_data
->ttvn
;
2565 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
2566 /* this node doesn't have the requested data */
2567 if (orig_ttvn
!= req_ttvn
||
2568 !batadv_tt_global_check_crc(req_dst_orig_node
, tt_vlan
,
2569 ntohs(tt_data
->num_vlan
)))
2572 /* If the full table has been explicitly requested */
2573 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
||
2574 !req_dst_orig_node
->tt_buff
)
2579 /* TT fragmentation hasn't been implemented yet, so send as many
2580 * TT entries fit a single packet as possible only
2583 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
2584 tt_len
= req_dst_orig_node
->tt_buff_len
;
2586 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2593 /* Copy the last orig_node's OGM buffer */
2594 memcpy(tt_change
, req_dst_orig_node
->tt_buff
,
2595 req_dst_orig_node
->tt_buff_len
);
2596 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2598 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2599 * in the initial part
2602 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2609 /* fill the rest of the tvlv with the real TT entries */
2610 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.global_hash
,
2612 batadv_tt_global_valid
,
2616 /* Don't send the response, if larger than fragmented packet. */
2617 tt_len
= sizeof(struct batadv_unicast_tvlv_packet
) + tvlv_len
;
2618 if (tt_len
> atomic_read(&bat_priv
->packet_size_max
)) {
2619 net_ratelimited_function(batadv_info
, bat_priv
->soft_iface
,
2620 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2621 res_dst_orig_node
->orig
);
2625 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2626 tvlv_tt_data
->ttvn
= req_ttvn
;
2629 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2631 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2632 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2633 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
,
2634 full_table
? 'F' : '.', req_ttvn
);
2636 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2638 batadv_tvlv_unicast_send(bat_priv
, req_dst_orig_node
->orig
,
2639 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2646 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2649 if (res_dst_orig_node
)
2650 batadv_orig_node_free_ref(res_dst_orig_node
);
2651 if (req_dst_orig_node
)
2652 batadv_orig_node_free_ref(req_dst_orig_node
);
2653 kfree(tvlv_tt_data
);
2658 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2660 * @bat_priv: the bat priv with all the soft interface information
2661 * @tt_data: tt data containing the tt request information
2662 * @req_src: mac address of tt request sender
2664 * Returns true if tt request reply was sent, false otherwise.
2666 static bool batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
2667 struct batadv_tvlv_tt_data
*tt_data
,
2670 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2671 struct batadv_hard_iface
*primary_if
= NULL
;
2672 struct batadv_tvlv_tt_change
*tt_change
;
2673 struct batadv_orig_node
*orig_node
;
2674 uint8_t my_ttvn
, req_ttvn
;
2679 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2680 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2681 req_src
, tt_data
->ttvn
,
2682 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
2684 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2686 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2687 req_ttvn
= tt_data
->ttvn
;
2689 orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2693 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2697 /* If the full table has been explicitly requested or the gap
2698 * is too big send the whole local translation table
2700 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
2701 !bat_priv
->tt
.last_changeset
)
2706 /* TT fragmentation hasn't been implemented yet, so send as many
2707 * TT entries fit a single packet as possible only
2710 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
2712 tt_len
= bat_priv
->tt
.last_changeset_len
;
2713 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2720 /* Copy the last orig_node's OGM buffer */
2721 memcpy(tt_change
, bat_priv
->tt
.last_changeset
,
2722 bat_priv
->tt
.last_changeset_len
);
2723 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2725 req_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2727 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2728 * in the initial part
2731 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2738 /* fill the rest of the tvlv with the real TT entries */
2739 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.local_hash
,
2741 batadv_tt_local_valid
, NULL
);
2744 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2745 tvlv_tt_data
->ttvn
= req_ttvn
;
2748 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2750 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2751 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2752 orig_node
->orig
, full_table
? 'F' : '.', req_ttvn
);
2754 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2756 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2757 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2763 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2765 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2767 batadv_orig_node_free_ref(orig_node
);
2769 batadv_hardif_free_ref(primary_if
);
2770 kfree(tvlv_tt_data
);
2771 /* The packet was for this host, so it doesn't need to be re-routed */
2776 * batadv_send_tt_response - send reply to tt request
2777 * @bat_priv: the bat priv with all the soft interface information
2778 * @tt_data: tt data containing the tt request information
2779 * @req_src: mac address of tt request sender
2780 * @req_dst: mac address of tt request recipient
2782 * Returns true if tt request reply was sent, false otherwise.
2784 static bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
2785 struct batadv_tvlv_tt_data
*tt_data
,
2786 uint8_t *req_src
, uint8_t *req_dst
)
2788 if (batadv_is_my_mac(bat_priv
, req_dst
))
2789 return batadv_send_my_tt_response(bat_priv
, tt_data
, req_src
);
2790 return batadv_send_other_tt_response(bat_priv
, tt_data
, req_src
,
2794 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2795 struct batadv_orig_node
*orig_node
,
2796 struct batadv_tvlv_tt_change
*tt_change
,
2797 uint16_t tt_num_changes
, uint8_t ttvn
)
2802 for (i
= 0; i
< tt_num_changes
; i
++) {
2803 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
2804 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
2805 batadv_tt_global_del(bat_priv
, orig_node
,
2806 (tt_change
+ i
)->addr
,
2807 ntohs((tt_change
+ i
)->vid
),
2808 "tt removed by changes",
2811 if (!batadv_tt_global_add(bat_priv
, orig_node
,
2812 (tt_change
+ i
)->addr
,
2813 ntohs((tt_change
+ i
)->vid
),
2814 (tt_change
+ i
)->flags
, ttvn
))
2815 /* In case of problem while storing a
2816 * global_entry, we stop the updating
2817 * procedure without committing the
2818 * ttvn change. This will avoid to send
2819 * corrupted data on tt_request
2824 orig_node
->capa_initialized
|= BATADV_ORIG_CAPA_HAS_TT
;
2827 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
2828 struct batadv_tvlv_tt_change
*tt_change
,
2829 uint8_t ttvn
, uint8_t *resp_src
,
2830 uint16_t num_entries
)
2832 struct batadv_orig_node
*orig_node
;
2834 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2838 /* Purge the old table first.. */
2839 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
2840 "Received full table");
2842 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
, num_entries
,
2845 spin_lock_bh(&orig_node
->tt_buff_lock
);
2846 kfree(orig_node
->tt_buff
);
2847 orig_node
->tt_buff_len
= 0;
2848 orig_node
->tt_buff
= NULL
;
2849 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2851 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2855 batadv_orig_node_free_ref(orig_node
);
2858 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2859 struct batadv_orig_node
*orig_node
,
2860 uint16_t tt_num_changes
, uint8_t ttvn
,
2861 struct batadv_tvlv_tt_change
*tt_change
)
2863 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2864 tt_num_changes
, ttvn
);
2866 batadv_tt_save_orig_buffer(bat_priv
, orig_node
, tt_change
,
2867 batadv_tt_len(tt_num_changes
));
2868 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2872 * batadv_is_my_client - check if a client is served by the local node
2873 * @bat_priv: the bat priv with all the soft interface information
2874 * @addr: the mac address of the client to check
2875 * @vid: VLAN identifier
2877 * Returns true if the client is served by this node, false otherwise.
2879 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
2882 struct batadv_tt_local_entry
*tt_local_entry
;
2885 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
2886 if (!tt_local_entry
)
2888 /* Check if the client has been logically deleted (but is kept for
2889 * consistency purpose)
2891 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2892 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2897 batadv_tt_local_entry_free_ref(tt_local_entry
);
2902 * batadv_handle_tt_response - process incoming tt reply
2903 * @bat_priv: the bat priv with all the soft interface information
2904 * @tt_data: tt data containing the tt request information
2905 * @resp_src: mac address of tt reply sender
2906 * @num_entries: number of tt change entries appended to the tt data
2908 static void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2909 struct batadv_tvlv_tt_data
*tt_data
,
2910 uint8_t *resp_src
, uint16_t num_entries
)
2912 struct batadv_tt_req_node
*node
, *safe
;
2913 struct batadv_orig_node
*orig_node
= NULL
;
2914 struct batadv_tvlv_tt_change
*tt_change
;
2915 uint8_t *tvlv_ptr
= (uint8_t *)tt_data
;
2916 uint16_t change_offset
;
2918 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2919 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2920 resp_src
, tt_data
->ttvn
, num_entries
,
2921 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
2923 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2927 spin_lock_bh(&orig_node
->tt_lock
);
2929 change_offset
= sizeof(struct batadv_tvlv_tt_vlan_data
);
2930 change_offset
*= ntohs(tt_data
->num_vlan
);
2931 change_offset
+= sizeof(*tt_data
);
2932 tvlv_ptr
+= change_offset
;
2934 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_ptr
;
2935 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
) {
2936 batadv_tt_fill_gtable(bat_priv
, tt_change
, tt_data
->ttvn
,
2937 resp_src
, num_entries
);
2939 batadv_tt_update_changes(bat_priv
, orig_node
, num_entries
,
2940 tt_data
->ttvn
, tt_change
);
2943 /* Recalculate the CRC for this orig_node and store it */
2944 batadv_tt_global_update_crc(bat_priv
, orig_node
);
2946 spin_unlock_bh(&orig_node
->tt_lock
);
2948 /* Delete the tt_req_node from pending tt_requests list */
2949 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2950 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2951 if (!batadv_compare_eth(node
->addr
, resp_src
))
2953 list_del(&node
->list
);
2957 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2960 batadv_orig_node_free_ref(orig_node
);
2963 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
2965 struct batadv_tt_roam_node
*node
, *safe
;
2967 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2969 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2970 list_del(&node
->list
);
2974 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2977 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
2979 struct batadv_tt_roam_node
*node
, *safe
;
2981 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2982 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2983 if (!batadv_has_timed_out(node
->first_time
,
2984 BATADV_ROAMING_MAX_TIME
))
2987 list_del(&node
->list
);
2990 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2993 /* This function checks whether the client already reached the
2994 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2997 * returns true if the ROAMING_ADV can be sent, false otherwise
2999 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
,
3002 struct batadv_tt_roam_node
*tt_roam_node
;
3005 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
3006 /* The new tt_req will be issued only if I'm not waiting for a
3007 * reply from the same orig_node yet
3009 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
3010 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
3013 if (batadv_has_timed_out(tt_roam_node
->first_time
,
3014 BATADV_ROAMING_MAX_TIME
))
3017 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
3018 /* Sorry, you roamed too many times! */
3025 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
3029 tt_roam_node
->first_time
= jiffies
;
3030 atomic_set(&tt_roam_node
->counter
,
3031 BATADV_ROAMING_MAX_COUNT
- 1);
3032 ether_addr_copy(tt_roam_node
->addr
, client
);
3034 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
3039 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
3044 * batadv_send_roam_adv - send a roaming advertisement message
3045 * @bat_priv: the bat priv with all the soft interface information
3046 * @client: mac address of the roaming client
3047 * @vid: VLAN identifier
3048 * @orig_node: message destination
3050 * Send a ROAMING_ADV message to the node which was previously serving this
3051 * client. This is done to inform the node that from now on all traffic destined
3052 * for this particular roamed client has to be forwarded to the sender of the
3055 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
3057 struct batadv_orig_node
*orig_node
)
3059 struct batadv_hard_iface
*primary_if
;
3060 struct batadv_tvlv_roam_adv tvlv_roam
;
3062 primary_if
= batadv_primary_if_get_selected(bat_priv
);
3066 /* before going on we have to check whether the client has
3067 * already roamed to us too many times
3069 if (!batadv_tt_check_roam_count(bat_priv
, client
))
3072 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3073 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3074 orig_node
->orig
, client
, BATADV_PRINT_VID(vid
));
3076 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
3078 memcpy(tvlv_roam
.client
, client
, sizeof(tvlv_roam
.client
));
3079 tvlv_roam
.vid
= htons(vid
);
3081 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
3082 orig_node
->orig
, BATADV_TVLV_ROAM
, 1,
3083 &tvlv_roam
, sizeof(tvlv_roam
));
3087 batadv_hardif_free_ref(primary_if
);
3090 static void batadv_tt_purge(struct work_struct
*work
)
3092 struct delayed_work
*delayed_work
;
3093 struct batadv_priv_tt
*priv_tt
;
3094 struct batadv_priv
*bat_priv
;
3096 delayed_work
= container_of(work
, struct delayed_work
, work
);
3097 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
3098 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
3100 batadv_tt_local_purge(bat_priv
, BATADV_TT_LOCAL_TIMEOUT
);
3101 batadv_tt_global_purge(bat_priv
);
3102 batadv_tt_req_purge(bat_priv
);
3103 batadv_tt_roam_purge(bat_priv
);
3105 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3106 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3109 void batadv_tt_free(struct batadv_priv
*bat_priv
)
3111 batadv_tvlv_container_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3112 batadv_tvlv_handler_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3114 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
3116 batadv_tt_local_table_free(bat_priv
);
3117 batadv_tt_global_table_free(bat_priv
);
3118 batadv_tt_req_list_free(bat_priv
);
3119 batadv_tt_changes_list_free(bat_priv
);
3120 batadv_tt_roam_list_free(bat_priv
);
3122 kfree(bat_priv
->tt
.last_changeset
);
3126 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3127 * table and possibly count them in the TT size
3128 * @bat_priv: the bat priv with all the soft interface information
3129 * @flags: the flag to switch
3130 * @enable: whether to set or unset the flag
3131 * @count: whether to increase the TT size by the number of changed entries
3133 static void batadv_tt_local_set_flags(struct batadv_priv
*bat_priv
,
3134 uint16_t flags
, bool enable
, bool count
)
3136 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3137 struct batadv_tt_common_entry
*tt_common_entry
;
3138 uint16_t changed_num
= 0;
3139 struct hlist_head
*head
;
3145 for (i
= 0; i
< hash
->size
; i
++) {
3146 head
= &hash
->table
[i
];
3149 hlist_for_each_entry_rcu(tt_common_entry
,
3152 if ((tt_common_entry
->flags
& flags
) == flags
)
3154 tt_common_entry
->flags
|= flags
;
3156 if (!(tt_common_entry
->flags
& flags
))
3158 tt_common_entry
->flags
&= ~flags
;
3165 batadv_tt_local_size_inc(bat_priv
,
3166 tt_common_entry
->vid
);
3172 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3173 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
3175 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3176 struct batadv_tt_common_entry
*tt_common
;
3177 struct batadv_tt_local_entry
*tt_local
;
3178 struct batadv_softif_vlan
*vlan
;
3179 struct hlist_node
*node_tmp
;
3180 struct hlist_head
*head
;
3181 spinlock_t
*list_lock
; /* protects write access to the hash lists */
3187 for (i
= 0; i
< hash
->size
; i
++) {
3188 head
= &hash
->table
[i
];
3189 list_lock
= &hash
->list_locks
[i
];
3191 spin_lock_bh(list_lock
);
3192 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
3194 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
3197 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3198 "Deleting local tt entry (%pM, vid: %d): pending\n",
3200 BATADV_PRINT_VID(tt_common
->vid
));
3202 batadv_tt_local_size_dec(bat_priv
, tt_common
->vid
);
3203 hlist_del_rcu(&tt_common
->hash_entry
);
3204 tt_local
= container_of(tt_common
,
3205 struct batadv_tt_local_entry
,
3208 /* decrease the reference held for this vlan */
3209 vlan
= batadv_softif_vlan_get(bat_priv
, tt_common
->vid
);
3210 batadv_softif_vlan_free_ref(vlan
);
3211 batadv_softif_vlan_free_ref(vlan
);
3213 batadv_tt_local_entry_free_ref(tt_local
);
3215 spin_unlock_bh(list_lock
);
3220 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3221 * which have been queued in the time since the last commit
3222 * @bat_priv: the bat priv with all the soft interface information
3224 * Caller must hold tt->commit_lock.
3226 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv
*bat_priv
)
3228 /* Update multicast addresses in local translation table */
3229 batadv_mcast_mla_update(bat_priv
);
3231 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1) {
3232 if (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))
3233 batadv_tt_tvlv_container_update(bat_priv
);
3237 batadv_tt_local_set_flags(bat_priv
, BATADV_TT_CLIENT_NEW
, false, true);
3239 batadv_tt_local_purge_pending_clients(bat_priv
);
3240 batadv_tt_local_update_crc(bat_priv
);
3242 /* Increment the TTVN only once per OGM interval */
3243 atomic_inc(&bat_priv
->tt
.vn
);
3244 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3245 "Local changes committed, updating to ttvn %u\n",
3246 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
3248 /* reset the sending counter */
3249 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
3250 batadv_tt_tvlv_container_update(bat_priv
);
3254 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3255 * have been queued in the time since the last commit
3256 * @bat_priv: the bat priv with all the soft interface information
3258 void batadv_tt_local_commit_changes(struct batadv_priv
*bat_priv
)
3260 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3261 batadv_tt_local_commit_changes_nolock(bat_priv
);
3262 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3265 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, uint8_t *src
,
3266 uint8_t *dst
, unsigned short vid
)
3268 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
3269 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
3270 struct batadv_softif_vlan
*vlan
;
3273 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
3274 if (!vlan
|| !atomic_read(&vlan
->ap_isolation
))
3277 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
, vid
);
3278 if (!tt_local_entry
)
3281 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
, vid
);
3282 if (!tt_global_entry
)
3285 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
3292 batadv_softif_vlan_free_ref(vlan
);
3293 if (tt_global_entry
)
3294 batadv_tt_global_entry_free_ref(tt_global_entry
);
3296 batadv_tt_local_entry_free_ref(tt_local_entry
);
3301 * batadv_tt_update_orig - update global translation table with new tt
3302 * information received via ogms
3303 * @bat_priv: the bat priv with all the soft interface information
3304 * @orig: the orig_node of the ogm
3305 * @tt_vlan: pointer to the first tvlv VLAN entry
3306 * @tt_num_vlan: number of tvlv VLAN entries
3307 * @tt_change: pointer to the first entry in the TT buffer
3308 * @tt_num_changes: number of tt changes inside the tt buffer
3309 * @ttvn: translation table version number of this changeset
3310 * @tt_crc: crc32 checksum of orig node's translation table
3312 static void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
3313 struct batadv_orig_node
*orig_node
,
3314 const void *tt_buff
, uint16_t tt_num_vlan
,
3315 struct batadv_tvlv_tt_change
*tt_change
,
3316 uint16_t tt_num_changes
, uint8_t ttvn
)
3318 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
3319 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3320 bool full_table
= true;
3323 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)tt_buff
;
3324 has_tt_init
= orig_node
->capa_initialized
& BATADV_ORIG_CAPA_HAS_TT
;
3326 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3327 * increased by one -> we can apply the attached changes
3329 if ((!has_tt_init
&& ttvn
== 1) || ttvn
- orig_ttvn
== 1) {
3330 /* the OGM could not contain the changes due to their size or
3331 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3333 * In this case send a tt request
3335 if (!tt_num_changes
) {
3340 spin_lock_bh(&orig_node
->tt_lock
);
3342 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
3345 /* Even if we received the precomputed crc with the OGM, we
3346 * prefer to recompute it to spot any possible inconsistency
3347 * in the global table
3349 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3351 spin_unlock_bh(&orig_node
->tt_lock
);
3353 /* The ttvn alone is not enough to guarantee consistency
3354 * because a single value could represent different states
3355 * (due to the wrap around). Thus a node has to check whether
3356 * the resulting table (after applying the changes) is still
3357 * consistent or not. E.g. a node could disconnect while its
3358 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3359 * checking the CRC value is mandatory to detect the
3362 if (!batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3366 /* if we missed more than one change or our tables are not
3367 * in sync anymore -> request fresh tt data
3369 if (!has_tt_init
|| ttvn
!= orig_ttvn
||
3370 !batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3373 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3374 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3375 orig_node
->orig
, ttvn
, orig_ttvn
,
3377 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
3378 tt_vlan
, tt_num_vlan
,
3386 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3387 * @bat_priv: the bat priv with all the soft interface information
3388 * @addr: the mac address of the client to check
3389 * @vid: VLAN identifier
3391 * Returns true if we know that the client has moved from its old originator
3392 * to another one. This entry is still kept for consistency purposes and will be
3393 * deleted later by a DEL or because of timeout
3395 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
3396 uint8_t *addr
, unsigned short vid
)
3398 struct batadv_tt_global_entry
*tt_global_entry
;
3401 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3402 if (!tt_global_entry
)
3405 ret
= tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3406 batadv_tt_global_entry_free_ref(tt_global_entry
);
3412 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3413 * @bat_priv: the bat priv with all the soft interface information
3414 * @addr: the mac address of the local client to query
3415 * @vid: VLAN identifier
3417 * Returns true if the local client is known to be roaming (it is not served by
3418 * this node anymore) or not. If yes, the client is still present in the table
3419 * to keep the latter consistent with the node TTVN
3421 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
3422 uint8_t *addr
, unsigned short vid
)
3424 struct batadv_tt_local_entry
*tt_local_entry
;
3427 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3428 if (!tt_local_entry
)
3431 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3432 batadv_tt_local_entry_free_ref(tt_local_entry
);
3437 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
3438 struct batadv_orig_node
*orig_node
,
3439 const unsigned char *addr
,
3444 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
, vid
,
3445 BATADV_TT_CLIENT_TEMP
,
3446 atomic_read(&orig_node
->last_ttvn
)))
3449 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3450 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3451 addr
, BATADV_PRINT_VID(vid
), orig_node
->orig
);
3458 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3459 * maximum packet size that can be transported through the mesh
3460 * @soft_iface: netdev struct of the mesh interface
3462 * Remove entries older than 'timeout' and half timeout if more entries need
3465 void batadv_tt_local_resize_to_mtu(struct net_device
*soft_iface
)
3467 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
3468 int packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
3469 int table_size
, timeout
= BATADV_TT_LOCAL_TIMEOUT
/ 2;
3470 bool reduced
= false;
3472 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3475 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
3476 if (packet_size_max
>= table_size
)
3479 batadv_tt_local_purge(bat_priv
, timeout
);
3480 batadv_tt_local_purge_pending_clients(bat_priv
);
3484 net_ratelimited_function(batadv_info
, soft_iface
,
3485 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3489 /* commit these changes immediately, to avoid synchronization problem
3493 batadv_tt_local_commit_changes_nolock(bat_priv
);
3495 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3499 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3500 * @bat_priv: the bat priv with all the soft interface information
3501 * @orig: the orig_node of the ogm
3502 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3503 * @tvlv_value: tvlv buffer containing the gateway data
3504 * @tvlv_value_len: tvlv buffer length
3506 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv
*bat_priv
,
3507 struct batadv_orig_node
*orig
,
3508 uint8_t flags
, void *tvlv_value
,
3509 uint16_t tvlv_value_len
)
3511 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3512 struct batadv_tvlv_tt_change
*tt_change
;
3513 struct batadv_tvlv_tt_data
*tt_data
;
3514 uint16_t num_entries
, num_vlan
;
3516 if (tvlv_value_len
< sizeof(*tt_data
))
3519 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3520 tvlv_value_len
-= sizeof(*tt_data
);
3522 num_vlan
= ntohs(tt_data
->num_vlan
);
3524 if (tvlv_value_len
< sizeof(*tt_vlan
) * num_vlan
)
3527 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
3528 tt_change
= (struct batadv_tvlv_tt_change
*)(tt_vlan
+ num_vlan
);
3529 tvlv_value_len
-= sizeof(*tt_vlan
) * num_vlan
;
3531 num_entries
= batadv_tt_entries(tvlv_value_len
);
3533 batadv_tt_update_orig(bat_priv
, orig
, tt_vlan
, num_vlan
, tt_change
,
3534 num_entries
, tt_data
->ttvn
);
3538 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3540 * @bat_priv: the bat priv with all the soft interface information
3541 * @src: mac address of tt tvlv sender
3542 * @dst: mac address of tt tvlv recipient
3543 * @tvlv_value: tvlv buffer containing the tt data
3544 * @tvlv_value_len: tvlv buffer length
3546 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3549 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3550 uint8_t *src
, uint8_t *dst
,
3552 uint16_t tvlv_value_len
)
3554 struct batadv_tvlv_tt_data
*tt_data
;
3555 uint16_t tt_vlan_len
, tt_num_entries
;
3559 if (tvlv_value_len
< sizeof(*tt_data
))
3560 return NET_RX_SUCCESS
;
3562 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3563 tvlv_value_len
-= sizeof(*tt_data
);
3565 tt_vlan_len
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3566 tt_vlan_len
*= ntohs(tt_data
->num_vlan
);
3568 if (tvlv_value_len
< tt_vlan_len
)
3569 return NET_RX_SUCCESS
;
3571 tvlv_value_len
-= tt_vlan_len
;
3572 tt_num_entries
= batadv_tt_entries(tvlv_value_len
);
3574 switch (tt_data
->flags
& BATADV_TT_DATA_TYPE_MASK
) {
3575 case BATADV_TT_REQUEST
:
3576 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
3578 /* If this node cannot provide a TT response the tt_request is
3581 ret
= batadv_send_tt_response(bat_priv
, tt_data
, src
, dst
);
3583 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3588 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3589 "Routing TT_REQUEST to %pM [%c]\n",
3591 /* tvlv API will re-route the packet */
3595 case BATADV_TT_RESPONSE
:
3596 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
3598 if (batadv_is_my_mac(bat_priv
, dst
)) {
3599 batadv_handle_tt_response(bat_priv
, tt_data
,
3600 src
, tt_num_entries
);
3601 return NET_RX_SUCCESS
;
3604 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3609 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3610 "Routing TT_RESPONSE to %pM [%c]\n", dst
, tt_flag
);
3612 /* tvlv API will re-route the packet */
3616 return NET_RX_SUCCESS
;
3620 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3621 * @bat_priv: the bat priv with all the soft interface information
3622 * @src: mac address of tt tvlv sender
3623 * @dst: mac address of tt tvlv recipient
3624 * @tvlv_value: tvlv buffer containing the tt data
3625 * @tvlv_value_len: tvlv buffer length
3627 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3630 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3631 uint8_t *src
, uint8_t *dst
,
3633 uint16_t tvlv_value_len
)
3635 struct batadv_tvlv_roam_adv
*roaming_adv
;
3636 struct batadv_orig_node
*orig_node
= NULL
;
3638 /* If this node is not the intended recipient of the
3639 * roaming advertisement the packet is forwarded
3640 * (the tvlv API will re-route the packet).
3642 if (!batadv_is_my_mac(bat_priv
, dst
))
3645 if (tvlv_value_len
< sizeof(*roaming_adv
))
3648 orig_node
= batadv_orig_hash_find(bat_priv
, src
);
3652 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
3653 roaming_adv
= (struct batadv_tvlv_roam_adv
*)tvlv_value
;
3655 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3656 "Received ROAMING_ADV from %pM (client %pM)\n",
3657 src
, roaming_adv
->client
);
3659 batadv_tt_global_add(bat_priv
, orig_node
, roaming_adv
->client
,
3660 ntohs(roaming_adv
->vid
), BATADV_TT_CLIENT_ROAM
,
3661 atomic_read(&orig_node
->last_ttvn
) + 1);
3665 batadv_orig_node_free_ref(orig_node
);
3666 return NET_RX_SUCCESS
;
3670 * batadv_tt_init - initialise the translation table internals
3671 * @bat_priv: the bat priv with all the soft interface information
3673 * Return 0 on success or negative error number in case of failure.
3675 int batadv_tt_init(struct batadv_priv
*bat_priv
)
3679 /* synchronized flags must be remote */
3680 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK
& BATADV_TT_REMOTE_MASK
));
3682 ret
= batadv_tt_local_init(bat_priv
);
3686 ret
= batadv_tt_global_init(bat_priv
);
3690 batadv_tvlv_handler_register(bat_priv
, batadv_tt_tvlv_ogm_handler_v1
,
3691 batadv_tt_tvlv_unicast_handler_v1
,
3692 BATADV_TVLV_TT
, 1, BATADV_NO_FLAGS
);
3694 batadv_tvlv_handler_register(bat_priv
, NULL
,
3695 batadv_roam_tvlv_unicast_handler_v1
,
3696 BATADV_TVLV_ROAM
, 1, BATADV_NO_FLAGS
);
3698 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
3699 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3700 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3706 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3707 * @bat_priv: the bat priv with all the soft interface information
3708 * @addr: the mac address of the client
3709 * @vid: the identifier of the VLAN where this client is connected
3711 * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3714 bool batadv_tt_global_is_isolated(struct batadv_priv
*bat_priv
,
3715 const uint8_t *addr
, unsigned short vid
)
3717 struct batadv_tt_global_entry
*tt
;
3720 tt
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3724 ret
= tt
->common
.flags
& BATADV_TT_CLIENT_ISOLA
;
3726 batadv_tt_global_entry_free_ref(tt
);