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/bitops.h>
23 #include <linux/bug.h>
24 #include <linux/byteorder/generic.h>
25 #include <linux/compiler.h>
26 #include <linux/crc32c.h>
27 #include <linux/errno.h>
28 #include <linux/etherdevice.h>
30 #include <linux/if_ether.h>
31 #include <linux/jhash.h>
32 #include <linux/jiffies.h>
33 #include <linux/kernel.h>
34 #include <linux/list.h>
35 #include <linux/lockdep.h>
36 #include <linux/netdevice.h>
37 #include <linux/rculist.h>
38 #include <linux/rcupdate.h>
39 #include <linux/seq_file.h>
40 #include <linux/slab.h>
41 #include <linux/spinlock.h>
42 #include <linux/stddef.h>
43 #include <linux/string.h>
44 #include <linux/workqueue.h>
45 #include <net/net_namespace.h>
47 #include "bridge_loop_avoidance.h"
48 #include "hard-interface.h"
50 #include "multicast.h"
51 #include "originator.h"
53 #include "soft-interface.h"
56 static struct lock_class_key batadv_tt_local_hash_lock_class_key
;
57 static struct lock_class_key batadv_tt_global_hash_lock_class_key
;
59 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, u8
*client
,
61 struct batadv_orig_node
*orig_node
);
62 static void batadv_tt_purge(struct work_struct
*work
);
64 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
);
65 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
66 struct batadv_orig_node
*orig_node
,
67 const unsigned char *addr
,
68 unsigned short vid
, const char *message
,
71 /* returns 1 if they are the same mac addr */
72 static int batadv_compare_tt(const struct hlist_node
*node
, const void *data2
)
74 const void *data1
= container_of(node
, struct batadv_tt_common_entry
,
77 return batadv_compare_eth(data1
, data2
);
81 * batadv_choose_tt - return the index of the tt entry in the hash table
82 * @data: pointer to the tt_common_entry object to map
83 * @size: the size of the hash table
85 * Returns the hash index where the object represented by 'data' should be
88 static inline u32
batadv_choose_tt(const void *data
, u32 size
)
90 struct batadv_tt_common_entry
*tt
;
93 tt
= (struct batadv_tt_common_entry
*)data
;
94 hash
= jhash(&tt
->addr
, ETH_ALEN
, hash
);
95 hash
= jhash(&tt
->vid
, sizeof(tt
->vid
), hash
);
101 * batadv_tt_hash_find - look for a client in the given hash table
102 * @hash: the hash table to search
103 * @addr: the mac address of the client to look for
104 * @vid: VLAN identifier
106 * Returns a pointer to the tt_common struct belonging to the searched client if
107 * found, NULL otherwise.
109 static struct batadv_tt_common_entry
*
110 batadv_tt_hash_find(struct batadv_hashtable
*hash
, const u8
*addr
,
113 struct hlist_head
*head
;
114 struct batadv_tt_common_entry to_search
, *tt
, *tt_tmp
= NULL
;
120 ether_addr_copy(to_search
.addr
, addr
);
123 index
= batadv_choose_tt(&to_search
, hash
->size
);
124 head
= &hash
->table
[index
];
127 hlist_for_each_entry_rcu(tt
, head
, hash_entry
) {
128 if (!batadv_compare_eth(tt
, addr
))
134 if (!atomic_inc_not_zero(&tt
->refcount
))
146 * batadv_tt_local_hash_find - search the local table for a given client
147 * @bat_priv: the bat priv with all the soft interface information
148 * @addr: the mac address of the client to look for
149 * @vid: VLAN identifier
151 * Returns a pointer to the corresponding tt_local_entry struct if the client is
152 * found, NULL otherwise.
154 static struct batadv_tt_local_entry
*
155 batadv_tt_local_hash_find(struct batadv_priv
*bat_priv
, const u8
*addr
,
158 struct batadv_tt_common_entry
*tt_common_entry
;
159 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
161 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.local_hash
, addr
,
164 tt_local_entry
= container_of(tt_common_entry
,
165 struct batadv_tt_local_entry
,
167 return tt_local_entry
;
171 * batadv_tt_global_hash_find - search the global table for a given client
172 * @bat_priv: the bat priv with all the soft interface information
173 * @addr: the mac address of the client to look for
174 * @vid: VLAN identifier
176 * Returns a pointer to the corresponding tt_global_entry struct if the client
177 * is found, NULL otherwise.
179 static struct batadv_tt_global_entry
*
180 batadv_tt_global_hash_find(struct batadv_priv
*bat_priv
, const u8
*addr
,
183 struct batadv_tt_common_entry
*tt_common_entry
;
184 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
186 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.global_hash
, addr
,
189 tt_global_entry
= container_of(tt_common_entry
,
190 struct batadv_tt_global_entry
,
192 return tt_global_entry
;
196 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry
*tt_local_entry
)
198 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
199 kfree_rcu(tt_local_entry
, common
.rcu
);
203 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
204 * tt_global_entry and possibly free it
205 * @tt_global_entry: the object to free
208 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry
*tt_global_entry
)
210 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
211 batadv_tt_global_del_orig_list(tt_global_entry
);
212 kfree_rcu(tt_global_entry
, common
.rcu
);
217 * batadv_tt_global_hash_count - count the number of orig entries
218 * @hash: hash table containing the tt entries
219 * @addr: the mac address of the client to count entries for
220 * @vid: VLAN identifier
222 * Return the number of originators advertising the given address/data
223 * (excluding ourself).
225 int batadv_tt_global_hash_count(struct batadv_priv
*bat_priv
,
226 const u8
*addr
, unsigned short vid
)
228 struct batadv_tt_global_entry
*tt_global_entry
;
231 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
232 if (!tt_global_entry
)
235 count
= atomic_read(&tt_global_entry
->orig_list_count
);
236 batadv_tt_global_entry_free_ref(tt_global_entry
);
241 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
243 struct batadv_tt_orig_list_entry
*orig_entry
;
245 orig_entry
= container_of(rcu
, struct batadv_tt_orig_list_entry
, rcu
);
247 /* We are in an rcu callback here, therefore we cannot use
248 * batadv_orig_node_free_ref() and its call_rcu():
249 * An rcu_barrier() wouldn't wait for that to finish
251 batadv_orig_node_free_ref_now(orig_entry
->orig_node
);
256 * batadv_tt_local_size_mod - change the size by v of the local table identified
258 * @bat_priv: the bat priv with all the soft interface information
259 * @vid: the VLAN identifier of the sub-table to change
260 * @v: the amount to sum to the local table size
262 static void batadv_tt_local_size_mod(struct batadv_priv
*bat_priv
,
263 unsigned short vid
, int v
)
265 struct batadv_softif_vlan
*vlan
;
267 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
271 atomic_add(v
, &vlan
->tt
.num_entries
);
273 batadv_softif_vlan_free_ref(vlan
);
277 * batadv_tt_local_size_inc - increase by one the local table size for the given
279 * @bat_priv: the bat priv with all the soft interface information
280 * @vid: the VLAN identifier
282 static void batadv_tt_local_size_inc(struct batadv_priv
*bat_priv
,
285 batadv_tt_local_size_mod(bat_priv
, vid
, 1);
289 * batadv_tt_local_size_dec - decrease by one the local table size for the given
291 * @bat_priv: the bat priv with all the soft interface information
292 * @vid: the VLAN identifier
294 static void batadv_tt_local_size_dec(struct batadv_priv
*bat_priv
,
297 batadv_tt_local_size_mod(bat_priv
, vid
, -1);
301 * batadv_tt_global_size_mod - change the size by v of the local table
303 * @bat_priv: the bat priv with all the soft interface information
304 * @vid: the VLAN identifier
305 * @v: the amount to sum to the global table size
307 static void batadv_tt_global_size_mod(struct batadv_orig_node
*orig_node
,
308 unsigned short vid
, int v
)
310 struct batadv_orig_node_vlan
*vlan
;
312 vlan
= batadv_orig_node_vlan_new(orig_node
, vid
);
316 if (atomic_add_return(v
, &vlan
->tt
.num_entries
) == 0) {
317 spin_lock_bh(&orig_node
->vlan_list_lock
);
318 hlist_del_init_rcu(&vlan
->list
);
319 spin_unlock_bh(&orig_node
->vlan_list_lock
);
320 batadv_orig_node_vlan_free_ref(vlan
);
323 batadv_orig_node_vlan_free_ref(vlan
);
327 * batadv_tt_global_size_inc - increase by one the global table size for the
329 * @orig_node: the originator which global table size has to be decreased
330 * @vid: the vlan identifier
332 static void batadv_tt_global_size_inc(struct batadv_orig_node
*orig_node
,
335 batadv_tt_global_size_mod(orig_node
, vid
, 1);
339 * batadv_tt_global_size_dec - decrease by one the global table size for the
341 * @orig_node: the originator which global table size has to be decreased
342 * @vid: the vlan identifier
344 static void batadv_tt_global_size_dec(struct batadv_orig_node
*orig_node
,
347 batadv_tt_global_size_mod(orig_node
, vid
, -1);
351 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry
*orig_entry
)
353 if (!atomic_dec_and_test(&orig_entry
->refcount
))
356 call_rcu(&orig_entry
->rcu
, batadv_tt_orig_list_entry_free_rcu
);
360 * batadv_tt_local_event - store a local TT event (ADD/DEL)
361 * @bat_priv: the bat priv with all the soft interface information
362 * @tt_local_entry: the TT entry involved in the event
363 * @event_flags: flags to store in the event structure
365 static void batadv_tt_local_event(struct batadv_priv
*bat_priv
,
366 struct batadv_tt_local_entry
*tt_local_entry
,
369 struct batadv_tt_change_node
*tt_change_node
, *entry
, *safe
;
370 struct batadv_tt_common_entry
*common
= &tt_local_entry
->common
;
371 u8 flags
= common
->flags
| event_flags
;
372 bool event_removed
= false;
373 bool del_op_requested
, del_op_entry
;
375 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
379 tt_change_node
->change
.flags
= flags
;
380 memset(tt_change_node
->change
.reserved
, 0,
381 sizeof(tt_change_node
->change
.reserved
));
382 ether_addr_copy(tt_change_node
->change
.addr
, common
->addr
);
383 tt_change_node
->change
.vid
= htons(common
->vid
);
385 del_op_requested
= flags
& BATADV_TT_CLIENT_DEL
;
387 /* check for ADD+DEL or DEL+ADD events */
388 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
389 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
391 if (!batadv_compare_eth(entry
->change
.addr
, common
->addr
))
394 /* DEL+ADD in the same orig interval have no effect and can be
395 * removed to avoid silly behaviour on the receiver side. The
396 * other way around (ADD+DEL) can happen in case of roaming of
397 * a client still in the NEW state. Roaming of NEW clients is
398 * now possible due to automatically recognition of "temporary"
401 del_op_entry
= entry
->change
.flags
& BATADV_TT_CLIENT_DEL
;
402 if (!del_op_requested
&& del_op_entry
)
404 if (del_op_requested
&& !del_op_entry
)
407 /* this is a second add in the same originator interval. It
408 * means that flags have been changed: update them!
410 if (!del_op_requested
&& !del_op_entry
)
411 entry
->change
.flags
= flags
;
415 list_del(&entry
->list
);
417 kfree(tt_change_node
);
418 event_removed
= true;
422 /* track the change in the OGMinterval list */
423 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
426 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
429 atomic_dec(&bat_priv
->tt
.local_changes
);
431 atomic_inc(&bat_priv
->tt
.local_changes
);
435 * batadv_tt_len - compute length in bytes of given number of tt changes
436 * @changes_num: number of tt changes
438 * Returns computed length in bytes.
440 static int batadv_tt_len(int changes_num
)
442 return changes_num
* sizeof(struct batadv_tvlv_tt_change
);
446 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
447 * @tt_len: available space
449 * Returns the number of entries.
451 static u16
batadv_tt_entries(u16 tt_len
)
453 return tt_len
/ batadv_tt_len(1);
457 * batadv_tt_local_table_transmit_size - calculates the local translation table
458 * size when transmitted over the air
459 * @bat_priv: the bat priv with all the soft interface information
461 * Returns local translation table size in bytes.
463 static int batadv_tt_local_table_transmit_size(struct batadv_priv
*bat_priv
)
466 u16 tt_local_entries
= 0;
467 struct batadv_softif_vlan
*vlan
;
471 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
473 tt_local_entries
+= atomic_read(&vlan
->tt
.num_entries
);
477 /* header size of tvlv encapsulated tt response payload */
478 hdr_size
= sizeof(struct batadv_unicast_tvlv_packet
);
479 hdr_size
+= sizeof(struct batadv_tvlv_hdr
);
480 hdr_size
+= sizeof(struct batadv_tvlv_tt_data
);
481 hdr_size
+= num_vlan
* sizeof(struct batadv_tvlv_tt_vlan_data
);
483 return hdr_size
+ batadv_tt_len(tt_local_entries
);
486 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
488 if (bat_priv
->tt
.local_hash
)
491 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
493 if (!bat_priv
->tt
.local_hash
)
496 batadv_hash_set_lock_class(bat_priv
->tt
.local_hash
,
497 &batadv_tt_local_hash_lock_class_key
);
502 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
503 struct batadv_tt_global_entry
*tt_global
,
506 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
507 "Deleting global tt entry %pM (vid: %d): %s\n",
508 tt_global
->common
.addr
,
509 BATADV_PRINT_VID(tt_global
->common
.vid
), message
);
511 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
512 batadv_choose_tt
, &tt_global
->common
);
513 batadv_tt_global_entry_free_ref(tt_global
);
517 * batadv_tt_local_add - add a new client to the local table or update an
519 * @soft_iface: netdev struct of the mesh interface
520 * @addr: the mac address of the client to add
521 * @vid: VLAN identifier
522 * @ifindex: index of the interface where the client is connected to (useful to
523 * identify wireless clients)
524 * @mark: the value contained in the skb->mark field of the received packet (if
527 * Returns true if the client was successfully added, false otherwise.
529 bool batadv_tt_local_add(struct net_device
*soft_iface
, const u8
*addr
,
530 unsigned short vid
, int ifindex
, u32 mark
)
532 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
533 struct batadv_tt_local_entry
*tt_local
;
534 struct batadv_tt_global_entry
*tt_global
= NULL
;
535 struct batadv_softif_vlan
*vlan
;
536 struct net_device
*in_dev
= NULL
;
537 struct hlist_head
*head
;
538 struct batadv_tt_orig_list_entry
*orig_entry
;
539 int hash_added
, table_size
, packet_size_max
;
541 bool roamed_back
= false;
545 if (ifindex
!= BATADV_NULL_IFINDEX
)
546 in_dev
= dev_get_by_index(&init_net
, ifindex
);
548 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
550 if (!is_multicast_ether_addr(addr
))
551 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
554 tt_local
->last_seen
= jiffies
;
555 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
556 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
557 "Re-adding pending client %pM (vid: %d)\n",
558 addr
, BATADV_PRINT_VID(vid
));
559 /* whatever the reason why the PENDING flag was set,
560 * this is a client which was enqueued to be removed in
561 * this orig_interval. Since it popped up again, the
562 * flag can be reset like it was never enqueued
564 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
568 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
569 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
570 "Roaming client %pM (vid: %d) came back to its original location\n",
571 addr
, BATADV_PRINT_VID(vid
));
572 /* the ROAM flag is set because this client roamed away
573 * and the node got a roaming_advertisement message. Now
574 * that the client popped up again at its original
575 * location such flag can be unset
577 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
583 /* Ignore the client if we cannot send it in a full table response. */
584 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
585 table_size
+= batadv_tt_len(1);
586 packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
587 if (table_size
> packet_size_max
) {
588 net_ratelimited_function(batadv_info
, soft_iface
,
589 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
590 table_size
, packet_size_max
, addr
);
594 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
598 /* increase the refcounter of the related vlan */
599 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
600 if (WARN(!vlan
, "adding TT local entry %pM to non-existent VLAN %d",
601 addr
, BATADV_PRINT_VID(vid
))) {
607 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
608 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
609 addr
, BATADV_PRINT_VID(vid
),
610 (u8
)atomic_read(&bat_priv
->tt
.vn
));
612 ether_addr_copy(tt_local
->common
.addr
, addr
);
613 /* The local entry has to be marked as NEW to avoid to send it in
614 * a full table response going out before the next ttvn increment
615 * (consistency check)
617 tt_local
->common
.flags
= BATADV_TT_CLIENT_NEW
;
618 tt_local
->common
.vid
= vid
;
619 if (batadv_is_wifi_netdev(in_dev
))
620 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
621 atomic_set(&tt_local
->common
.refcount
, 2);
622 tt_local
->last_seen
= jiffies
;
623 tt_local
->common
.added_at
= tt_local
->last_seen
;
625 /* the batman interface mac and multicast addresses should never be
628 if (batadv_compare_eth(addr
, soft_iface
->dev_addr
) ||
629 is_multicast_ether_addr(addr
))
630 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NOPURGE
;
632 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
633 batadv_choose_tt
, &tt_local
->common
,
634 &tt_local
->common
.hash_entry
);
636 if (unlikely(hash_added
!= 0)) {
637 /* remove the reference for the hash */
638 batadv_tt_local_entry_free_ref(tt_local
);
639 batadv_softif_vlan_free_ref(vlan
);
644 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
647 /* Check whether it is a roaming, but don't do anything if the roaming
648 * process has already been handled
650 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
651 /* These node are probably going to update their tt table */
652 head
= &tt_global
->orig_list
;
654 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
655 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
656 tt_global
->common
.vid
,
657 orig_entry
->orig_node
);
661 batadv_tt_global_free(bat_priv
, tt_global
,
665 /* The global entry has to be marked as ROAMING and
666 * has to be kept for consistency purpose
668 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
669 tt_global
->roam_at
= jiffies
;
673 /* store the current remote flags before altering them. This helps
674 * understanding is flags are changing or not
676 remote_flags
= tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
;
678 if (batadv_is_wifi_netdev(in_dev
))
679 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
681 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_WIFI
;
683 /* check the mark in the skb: if it's equal to the configured
684 * isolation_mark, it means the packet is coming from an isolated
687 match_mark
= (mark
& bat_priv
->isolation_mark_mask
);
688 if (bat_priv
->isolation_mark_mask
&&
689 match_mark
== bat_priv
->isolation_mark
)
690 tt_local
->common
.flags
|= BATADV_TT_CLIENT_ISOLA
;
692 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ISOLA
;
694 /* if any "dynamic" flag has been modified, resend an ADD event for this
695 * entry so that all the nodes can get the new flags
697 if (remote_flags
^ (tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
))
698 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
705 batadv_tt_local_entry_free_ref(tt_local
);
707 batadv_tt_global_entry_free_ref(tt_global
);
712 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
713 * within a TT Response directed to another node
714 * @orig_node: originator for which the TT data has to be prepared
715 * @tt_data: uninitialised pointer to the address of the TVLV buffer
716 * @tt_change: uninitialised pointer to the address of the area where the TT
717 * changed can be stored
718 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
719 * function reserves the amount of space needed to send the entire global TT
720 * table. In case of success the value is updated with the real amount of
723 * Allocate the needed amount of memory for the entire TT TVLV and write its
724 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
725 * objects, one per active VLAN served by the originator node.
727 * Return the size of the allocated buffer or 0 in case of failure.
730 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node
*orig_node
,
731 struct batadv_tvlv_tt_data
**tt_data
,
732 struct batadv_tvlv_tt_change
**tt_change
,
739 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
740 struct batadv_orig_node_vlan
*vlan
;
744 hlist_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
746 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
749 change_offset
= sizeof(**tt_data
);
750 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
752 /* if tt_len is negative, allocate the space needed by the full table */
754 *tt_len
= batadv_tt_len(num_entries
);
757 tvlv_len
+= change_offset
;
759 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
765 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
766 (*tt_data
)->ttvn
= atomic_read(&orig_node
->last_ttvn
);
767 (*tt_data
)->num_vlan
= htons(num_vlan
);
769 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
770 hlist_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
771 tt_vlan
->vid
= htons(vlan
->vid
);
772 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
777 tt_change_ptr
= (u8
*)*tt_data
+ change_offset
;
778 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
786 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
788 * @bat_priv: the bat priv with all the soft interface information
789 * @tt_data: uninitialised pointer to the address of the TVLV buffer
790 * @tt_change: uninitialised pointer to the address of the area where the TT
791 * changes can be stored
792 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
793 * function reserves the amount of space needed to send the entire local TT
794 * table. In case of success the value is updated with the real amount of
797 * Allocate the needed amount of memory for the entire TT TVLV and write its
798 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
799 * objects, one per active VLAN.
801 * Return the size of the allocated buffer or 0 in case of failure.
804 batadv_tt_prepare_tvlv_local_data(struct batadv_priv
*bat_priv
,
805 struct batadv_tvlv_tt_data
**tt_data
,
806 struct batadv_tvlv_tt_change
**tt_change
,
809 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
810 struct batadv_softif_vlan
*vlan
;
818 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
820 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
823 change_offset
= sizeof(**tt_data
);
824 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
826 /* if tt_len is negative, allocate the space needed by the full table */
828 *tt_len
= batadv_tt_len(num_entries
);
831 tvlv_len
+= change_offset
;
833 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
839 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
840 (*tt_data
)->ttvn
= atomic_read(&bat_priv
->tt
.vn
);
841 (*tt_data
)->num_vlan
= htons(num_vlan
);
843 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
844 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
845 tt_vlan
->vid
= htons(vlan
->vid
);
846 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
851 tt_change_ptr
= (u8
*)*tt_data
+ change_offset
;
852 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
860 * batadv_tt_tvlv_container_update - update the translation table tvlv container
861 * after local tt changes have been committed
862 * @bat_priv: the bat priv with all the soft interface information
864 static void batadv_tt_tvlv_container_update(struct batadv_priv
*bat_priv
)
866 struct batadv_tt_change_node
*entry
, *safe
;
867 struct batadv_tvlv_tt_data
*tt_data
;
868 struct batadv_tvlv_tt_change
*tt_change
;
869 int tt_diff_len
, tt_change_len
= 0;
870 int tt_diff_entries_num
= 0;
871 int tt_diff_entries_count
= 0;
874 tt_diff_entries_num
= atomic_read(&bat_priv
->tt
.local_changes
);
875 tt_diff_len
= batadv_tt_len(tt_diff_entries_num
);
877 /* if we have too many changes for one packet don't send any
878 * and wait for the tt table request which will be fragmented
880 if (tt_diff_len
> bat_priv
->soft_iface
->mtu
)
883 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
, &tt_data
,
884 &tt_change
, &tt_diff_len
);
888 tt_data
->flags
= BATADV_TT_OGM_DIFF
;
890 if (tt_diff_len
== 0)
891 goto container_register
;
893 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
894 atomic_set(&bat_priv
->tt
.local_changes
, 0);
896 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
898 if (tt_diff_entries_count
< tt_diff_entries_num
) {
899 memcpy(tt_change
+ tt_diff_entries_count
,
901 sizeof(struct batadv_tvlv_tt_change
));
902 tt_diff_entries_count
++;
904 list_del(&entry
->list
);
907 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
909 /* Keep the buffer for possible tt_request */
910 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
911 kfree(bat_priv
->tt
.last_changeset
);
912 bat_priv
->tt
.last_changeset_len
= 0;
913 bat_priv
->tt
.last_changeset
= NULL
;
914 tt_change_len
= batadv_tt_len(tt_diff_entries_count
);
915 /* check whether this new OGM has no changes due to size problems */
916 if (tt_diff_entries_count
> 0) {
917 /* if kmalloc() fails we will reply with the full table
918 * instead of providing the diff
920 bat_priv
->tt
.last_changeset
= kzalloc(tt_diff_len
, GFP_ATOMIC
);
921 if (bat_priv
->tt
.last_changeset
) {
922 memcpy(bat_priv
->tt
.last_changeset
,
923 tt_change
, tt_change_len
);
924 bat_priv
->tt
.last_changeset_len
= tt_diff_len
;
927 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
930 batadv_tvlv_container_register(bat_priv
, BATADV_TVLV_TT
, 1, tt_data
,
935 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
937 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
938 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
939 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
940 struct batadv_tt_common_entry
*tt_common_entry
;
941 struct batadv_tt_local_entry
*tt_local
;
942 struct batadv_hard_iface
*primary_if
;
943 struct batadv_softif_vlan
*vlan
;
944 struct hlist_head
*head
;
949 unsigned long last_seen_jiffies
;
951 u16 np_flag
= BATADV_TT_CLIENT_NOPURGE
;
953 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
958 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
959 net_dev
->name
, (u8
)atomic_read(&bat_priv
->tt
.vn
));
960 seq_printf(seq
, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
961 "Flags", "Last seen", "CRC");
963 for (i
= 0; i
< hash
->size
; i
++) {
964 head
= &hash
->table
[i
];
967 hlist_for_each_entry_rcu(tt_common_entry
,
969 tt_local
= container_of(tt_common_entry
,
970 struct batadv_tt_local_entry
,
972 vid
= tt_common_entry
->vid
;
973 last_seen_jiffies
= jiffies
- tt_local
->last_seen
;
974 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
975 last_seen_secs
= last_seen_msecs
/ 1000;
976 last_seen_msecs
= last_seen_msecs
% 1000;
978 no_purge
= tt_common_entry
->flags
& np_flag
;
980 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
982 seq_printf(seq
, "Cannot retrieve VLAN %d\n",
983 BATADV_PRINT_VID(vid
));
988 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
989 tt_common_entry
->addr
,
990 BATADV_PRINT_VID(tt_common_entry
->vid
),
991 ((tt_common_entry
->flags
&
992 BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
993 no_purge
? 'P' : '.',
994 ((tt_common_entry
->flags
&
995 BATADV_TT_CLIENT_NEW
) ? 'N' : '.'),
996 ((tt_common_entry
->flags
&
997 BATADV_TT_CLIENT_PENDING
) ? 'X' : '.'),
998 ((tt_common_entry
->flags
&
999 BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
1000 ((tt_common_entry
->flags
&
1001 BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
1002 no_purge
? 0 : last_seen_secs
,
1003 no_purge
? 0 : last_seen_msecs
,
1006 batadv_softif_vlan_free_ref(vlan
);
1012 batadv_hardif_free_ref(primary_if
);
1017 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
1018 struct batadv_tt_local_entry
*tt_local_entry
,
1019 u16 flags
, const char *message
)
1021 batadv_tt_local_event(bat_priv
, tt_local_entry
, flags
);
1023 /* The local client has to be marked as "pending to be removed" but has
1024 * to be kept in the table in order to send it in a full table
1025 * response issued before the net ttvn increment (consistency check)
1027 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
1029 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1030 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1031 tt_local_entry
->common
.addr
,
1032 BATADV_PRINT_VID(tt_local_entry
->common
.vid
), message
);
1036 * batadv_tt_local_remove - logically remove an entry from the local table
1037 * @bat_priv: the bat priv with all the soft interface information
1038 * @addr: the MAC address of the client to remove
1039 * @vid: VLAN identifier
1040 * @message: message to append to the log on deletion
1041 * @roaming: true if the deletion is due to a roaming event
1043 * Returns the flags assigned to the local entry before being deleted
1045 u16
batadv_tt_local_remove(struct batadv_priv
*bat_priv
, const u8
*addr
,
1046 unsigned short vid
, const char *message
,
1049 struct batadv_tt_local_entry
*tt_local_entry
;
1050 u16 flags
, curr_flags
= BATADV_NO_FLAGS
;
1051 struct batadv_softif_vlan
*vlan
;
1052 void *tt_entry_exists
;
1054 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
1055 if (!tt_local_entry
)
1058 curr_flags
= tt_local_entry
->common
.flags
;
1060 flags
= BATADV_TT_CLIENT_DEL
;
1061 /* if this global entry addition is due to a roaming, the node has to
1062 * mark the local entry as "roamed" in order to correctly reroute
1066 flags
|= BATADV_TT_CLIENT_ROAM
;
1067 /* mark the local client as ROAMed */
1068 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1071 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
1072 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
1076 /* if this client has been added right now, it is possible to
1077 * immediately purge it
1079 batadv_tt_local_event(bat_priv
, tt_local_entry
, BATADV_TT_CLIENT_DEL
);
1081 tt_entry_exists
= batadv_hash_remove(bat_priv
->tt
.local_hash
,
1084 &tt_local_entry
->common
);
1085 if (!tt_entry_exists
)
1088 /* extra call to free the local tt entry */
1089 batadv_tt_local_entry_free_ref(tt_local_entry
);
1091 /* decrease the reference held for this vlan */
1092 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1096 batadv_softif_vlan_free_ref(vlan
);
1097 batadv_softif_vlan_free_ref(vlan
);
1101 batadv_tt_local_entry_free_ref(tt_local_entry
);
1107 * batadv_tt_local_purge_list - purge inactive tt local entries
1108 * @bat_priv: the bat priv with all the soft interface information
1109 * @head: pointer to the list containing the local tt entries
1110 * @timeout: parameter deciding whether a given tt local entry is considered
1113 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
1114 struct hlist_head
*head
,
1117 struct batadv_tt_local_entry
*tt_local_entry
;
1118 struct batadv_tt_common_entry
*tt_common_entry
;
1119 struct hlist_node
*node_tmp
;
1121 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
, head
,
1123 tt_local_entry
= container_of(tt_common_entry
,
1124 struct batadv_tt_local_entry
,
1126 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
1129 /* entry already marked for deletion */
1130 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
1133 if (!batadv_has_timed_out(tt_local_entry
->last_seen
, timeout
))
1136 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
1137 BATADV_TT_CLIENT_DEL
, "timed out");
1142 * batadv_tt_local_purge - purge inactive tt local entries
1143 * @bat_priv: the bat priv with all the soft interface information
1144 * @timeout: parameter deciding whether a given tt local entry is considered
1147 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
,
1150 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1151 struct hlist_head
*head
;
1152 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1155 for (i
= 0; i
< hash
->size
; i
++) {
1156 head
= &hash
->table
[i
];
1157 list_lock
= &hash
->list_locks
[i
];
1159 spin_lock_bh(list_lock
);
1160 batadv_tt_local_purge_list(bat_priv
, head
, timeout
);
1161 spin_unlock_bh(list_lock
);
1165 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
1167 struct batadv_hashtable
*hash
;
1168 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1169 struct batadv_tt_common_entry
*tt_common_entry
;
1170 struct batadv_tt_local_entry
*tt_local
;
1171 struct batadv_softif_vlan
*vlan
;
1172 struct hlist_node
*node_tmp
;
1173 struct hlist_head
*head
;
1176 if (!bat_priv
->tt
.local_hash
)
1179 hash
= bat_priv
->tt
.local_hash
;
1181 for (i
= 0; i
< hash
->size
; i
++) {
1182 head
= &hash
->table
[i
];
1183 list_lock
= &hash
->list_locks
[i
];
1185 spin_lock_bh(list_lock
);
1186 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1188 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1189 tt_local
= container_of(tt_common_entry
,
1190 struct batadv_tt_local_entry
,
1193 /* decrease the reference held for this vlan */
1194 vlan
= batadv_softif_vlan_get(bat_priv
,
1195 tt_common_entry
->vid
);
1197 batadv_softif_vlan_free_ref(vlan
);
1198 batadv_softif_vlan_free_ref(vlan
);
1201 batadv_tt_local_entry_free_ref(tt_local
);
1203 spin_unlock_bh(list_lock
);
1206 batadv_hash_destroy(hash
);
1208 bat_priv
->tt
.local_hash
= NULL
;
1211 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
1213 if (bat_priv
->tt
.global_hash
)
1216 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
1218 if (!bat_priv
->tt
.global_hash
)
1221 batadv_hash_set_lock_class(bat_priv
->tt
.global_hash
,
1222 &batadv_tt_global_hash_lock_class_key
);
1227 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
1229 struct batadv_tt_change_node
*entry
, *safe
;
1231 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
1233 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
1235 list_del(&entry
->list
);
1239 atomic_set(&bat_priv
->tt
.local_changes
, 0);
1240 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
1243 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1244 * batadv_tt_global_entry list
1246 * returns it with an increased refcounter, NULL if not found
1248 static struct batadv_tt_orig_list_entry
*
1249 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
1250 const struct batadv_orig_node
*orig_node
)
1252 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
1253 const struct hlist_head
*head
;
1256 head
= &entry
->orig_list
;
1257 hlist_for_each_entry_rcu(tmp_orig_entry
, head
, list
) {
1258 if (tmp_orig_entry
->orig_node
!= orig_node
)
1260 if (!atomic_inc_not_zero(&tmp_orig_entry
->refcount
))
1263 orig_entry
= tmp_orig_entry
;
1271 /* find out if an orig_node is already in the list of a tt_global_entry.
1272 * returns true if found, false otherwise
1275 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
1276 const struct batadv_orig_node
*orig_node
)
1278 struct batadv_tt_orig_list_entry
*orig_entry
;
1281 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
1284 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1291 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
1292 struct batadv_orig_node
*orig_node
, int ttvn
)
1294 struct batadv_tt_orig_list_entry
*orig_entry
;
1296 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
1298 /* refresh the ttvn: the current value could be a bogus one that
1299 * was added during a "temporary client detection"
1301 orig_entry
->ttvn
= ttvn
;
1305 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
1309 INIT_HLIST_NODE(&orig_entry
->list
);
1310 atomic_inc(&orig_node
->refcount
);
1311 batadv_tt_global_size_inc(orig_node
, tt_global
->common
.vid
);
1312 orig_entry
->orig_node
= orig_node
;
1313 orig_entry
->ttvn
= ttvn
;
1314 atomic_set(&orig_entry
->refcount
, 2);
1316 spin_lock_bh(&tt_global
->list_lock
);
1317 hlist_add_head_rcu(&orig_entry
->list
,
1318 &tt_global
->orig_list
);
1319 spin_unlock_bh(&tt_global
->list_lock
);
1320 atomic_inc(&tt_global
->orig_list_count
);
1324 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1328 * batadv_tt_global_add - add a new TT global entry or update an existing one
1329 * @bat_priv: the bat priv with all the soft interface information
1330 * @orig_node: the originator announcing the client
1331 * @tt_addr: the mac address of the non-mesh client
1332 * @vid: VLAN identifier
1333 * @flags: TT flags that have to be set for this non-mesh client
1334 * @ttvn: the tt version number ever announcing this non-mesh client
1336 * Add a new TT global entry for the given originator. If the entry already
1337 * exists add a new reference to the given originator (a global entry can have
1338 * references to multiple originators) and adjust the flags attribute to reflect
1339 * the function argument.
1340 * If a TT local entry exists for this non-mesh client remove it.
1342 * The caller must hold orig_node refcount.
1344 * Return true if the new entry has been added, false otherwise
1346 static bool batadv_tt_global_add(struct batadv_priv
*bat_priv
,
1347 struct batadv_orig_node
*orig_node
,
1348 const unsigned char *tt_addr
,
1349 unsigned short vid
, u16 flags
, u8 ttvn
)
1351 struct batadv_tt_global_entry
*tt_global_entry
;
1352 struct batadv_tt_local_entry
*tt_local_entry
;
1355 struct batadv_tt_common_entry
*common
;
1358 /* ignore global entries from backbone nodes */
1359 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
, vid
))
1362 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
, vid
);
1363 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
, vid
);
1365 /* if the node already has a local client for this entry, it has to wait
1366 * for a roaming advertisement instead of manually messing up the global
1369 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
1370 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
1373 if (!tt_global_entry
) {
1374 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
1375 if (!tt_global_entry
)
1378 common
= &tt_global_entry
->common
;
1379 ether_addr_copy(common
->addr
, tt_addr
);
1382 common
->flags
= flags
;
1383 tt_global_entry
->roam_at
= 0;
1384 /* node must store current time in case of roaming. This is
1385 * needed to purge this entry out on timeout (if nobody claims
1388 if (flags
& BATADV_TT_CLIENT_ROAM
)
1389 tt_global_entry
->roam_at
= jiffies
;
1390 atomic_set(&common
->refcount
, 2);
1391 common
->added_at
= jiffies
;
1393 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
1394 atomic_set(&tt_global_entry
->orig_list_count
, 0);
1395 spin_lock_init(&tt_global_entry
->list_lock
);
1397 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
1399 batadv_choose_tt
, common
,
1400 &common
->hash_entry
);
1402 if (unlikely(hash_added
!= 0)) {
1403 /* remove the reference for the hash */
1404 batadv_tt_global_entry_free_ref(tt_global_entry
);
1408 common
= &tt_global_entry
->common
;
1409 /* If there is already a global entry, we can use this one for
1411 * But if we are trying to add a temporary client then here are
1412 * two options at this point:
1413 * 1) the global client is not a temporary client: the global
1414 * client has to be left as it is, temporary information
1415 * should never override any already known client state
1416 * 2) the global client is a temporary client: purge the
1417 * originator list and add the new one orig_entry
1419 if (flags
& BATADV_TT_CLIENT_TEMP
) {
1420 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
1422 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
1425 batadv_tt_global_del_orig_list(tt_global_entry
);
1426 goto add_orig_entry
;
1429 /* if the client was temporary added before receiving the first
1430 * OGM announcing it, we have to clear the TEMP flag
1432 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
1434 /* the change can carry possible "attribute" flags like the
1435 * TT_CLIENT_WIFI, therefore they have to be copied in the
1438 tt_global_entry
->common
.flags
|= flags
;
1440 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1441 * one originator left in the list and we previously received a
1442 * delete + roaming change for this originator.
1444 * We should first delete the old originator before adding the
1447 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
1448 batadv_tt_global_del_orig_list(tt_global_entry
);
1449 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
1450 tt_global_entry
->roam_at
= 0;
1454 /* add the new orig_entry (if needed) or update it */
1455 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
1457 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1458 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1459 common
->addr
, BATADV_PRINT_VID(common
->vid
),
1464 /* Do not remove multicast addresses from the local hash on
1467 if (is_multicast_ether_addr(tt_addr
))
1470 /* remove address from local hash if present */
1471 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
, vid
,
1472 "global tt received",
1473 flags
& BATADV_TT_CLIENT_ROAM
);
1474 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
1476 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
1477 /* this is a normal global add. Therefore the client is not in a
1478 * roaming state anymore.
1480 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
1483 if (tt_global_entry
)
1484 batadv_tt_global_entry_free_ref(tt_global_entry
);
1486 batadv_tt_local_entry_free_ref(tt_local_entry
);
1491 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1492 * @bat_priv: the bat priv with all the soft interface information
1493 * @tt_global_entry: global translation table entry to be analyzed
1495 * This functon assumes the caller holds rcu_read_lock().
1496 * Returns best originator list entry or NULL on errors.
1498 static struct batadv_tt_orig_list_entry
*
1499 batadv_transtable_best_orig(struct batadv_priv
*bat_priv
,
1500 struct batadv_tt_global_entry
*tt_global_entry
)
1502 struct batadv_neigh_node
*router
, *best_router
= NULL
;
1503 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
1504 struct hlist_head
*head
;
1505 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
1507 head
= &tt_global_entry
->orig_list
;
1508 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1509 router
= batadv_orig_router_get(orig_entry
->orig_node
,
1515 bao
->bat_neigh_cmp(router
, BATADV_IF_DEFAULT
,
1516 best_router
, BATADV_IF_DEFAULT
) <= 0) {
1517 batadv_neigh_node_free_ref(router
);
1521 /* release the refcount for the "old" best */
1523 batadv_neigh_node_free_ref(best_router
);
1525 best_entry
= orig_entry
;
1526 best_router
= router
;
1530 batadv_neigh_node_free_ref(best_router
);
1536 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1537 * for this global entry
1538 * @bat_priv: the bat priv with all the soft interface information
1539 * @tt_global_entry: global translation table entry to be printed
1540 * @seq: debugfs table seq_file struct
1542 * This functon assumes the caller holds rcu_read_lock().
1545 batadv_tt_global_print_entry(struct batadv_priv
*bat_priv
,
1546 struct batadv_tt_global_entry
*tt_global_entry
,
1547 struct seq_file
*seq
)
1549 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
1550 struct batadv_tt_common_entry
*tt_common_entry
;
1551 struct batadv_orig_node_vlan
*vlan
;
1552 struct hlist_head
*head
;
1556 tt_common_entry
= &tt_global_entry
->common
;
1557 flags
= tt_common_entry
->flags
;
1559 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1561 vlan
= batadv_orig_node_vlan_get(best_entry
->orig_node
,
1562 tt_common_entry
->vid
);
1565 " * Cannot retrieve VLAN %d for originator %pM\n",
1566 BATADV_PRINT_VID(tt_common_entry
->vid
),
1567 best_entry
->orig_node
->orig
);
1571 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
1573 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1574 '*', tt_global_entry
->common
.addr
,
1575 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1576 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
1577 last_ttvn
, vlan
->tt
.crc
,
1578 ((flags
& BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
1579 ((flags
& BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
1580 ((flags
& BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
1581 ((flags
& BATADV_TT_CLIENT_TEMP
) ? 'T' : '.'));
1583 batadv_orig_node_vlan_free_ref(vlan
);
1587 head
= &tt_global_entry
->orig_list
;
1589 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1590 if (best_entry
== orig_entry
)
1593 vlan
= batadv_orig_node_vlan_get(orig_entry
->orig_node
,
1594 tt_common_entry
->vid
);
1597 " + Cannot retrieve VLAN %d for originator %pM\n",
1598 BATADV_PRINT_VID(tt_common_entry
->vid
),
1599 orig_entry
->orig_node
->orig
);
1603 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
1605 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1606 '+', tt_global_entry
->common
.addr
,
1607 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1608 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1609 last_ttvn
, vlan
->tt
.crc
,
1610 ((flags
& BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
1611 ((flags
& BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
1612 ((flags
& BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
1613 ((flags
& BATADV_TT_CLIENT_TEMP
) ? 'T' : '.'));
1615 batadv_orig_node_vlan_free_ref(vlan
);
1619 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1621 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1622 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1623 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1624 struct batadv_tt_common_entry
*tt_common_entry
;
1625 struct batadv_tt_global_entry
*tt_global
;
1626 struct batadv_hard_iface
*primary_if
;
1627 struct hlist_head
*head
;
1630 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1635 "Globally announced TT entries received via the mesh %s\n",
1637 seq_printf(seq
, " %-13s %s %s %-15s %s (%-10s) %s\n",
1638 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1641 for (i
= 0; i
< hash
->size
; i
++) {
1642 head
= &hash
->table
[i
];
1645 hlist_for_each_entry_rcu(tt_common_entry
,
1647 tt_global
= container_of(tt_common_entry
,
1648 struct batadv_tt_global_entry
,
1650 batadv_tt_global_print_entry(bat_priv
, tt_global
, seq
);
1656 batadv_hardif_free_ref(primary_if
);
1661 * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1662 * @tt_global_entry: the global entry to remove the orig_entry from
1663 * @orig_entry: the orig entry to remove and free
1665 * Remove an orig_entry from its list in the given tt_global_entry and
1666 * free this orig_entry afterwards.
1668 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1672 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry
*tt_global_entry
,
1673 struct batadv_tt_orig_list_entry
*orig_entry
)
1675 lockdep_assert_held(&tt_global_entry
->list_lock
);
1677 batadv_tt_global_size_dec(orig_entry
->orig_node
,
1678 tt_global_entry
->common
.vid
);
1679 atomic_dec(&tt_global_entry
->orig_list_count
);
1680 /* requires holding tt_global_entry->list_lock and orig_entry->list
1681 * being part of a list
1683 hlist_del_rcu(&orig_entry
->list
);
1684 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1687 /* deletes the orig list of a tt_global_entry */
1689 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1691 struct hlist_head
*head
;
1692 struct hlist_node
*safe
;
1693 struct batadv_tt_orig_list_entry
*orig_entry
;
1695 spin_lock_bh(&tt_global_entry
->list_lock
);
1696 head
= &tt_global_entry
->orig_list
;
1697 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
)
1698 _batadv_tt_global_del_orig_entry(tt_global_entry
, orig_entry
);
1699 spin_unlock_bh(&tt_global_entry
->list_lock
);
1703 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1704 * @bat_priv: the bat priv with all the soft interface information
1705 * @tt_global_entry: the global entry to remove the orig_node from
1706 * @orig_node: the originator announcing the client
1707 * @message: message to append to the log on deletion
1709 * Remove the given orig_node and its according orig_entry from the given
1713 batadv_tt_global_del_orig_node(struct batadv_priv
*bat_priv
,
1714 struct batadv_tt_global_entry
*tt_global_entry
,
1715 struct batadv_orig_node
*orig_node
,
1716 const char *message
)
1718 struct hlist_head
*head
;
1719 struct hlist_node
*safe
;
1720 struct batadv_tt_orig_list_entry
*orig_entry
;
1723 spin_lock_bh(&tt_global_entry
->list_lock
);
1724 head
= &tt_global_entry
->orig_list
;
1725 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1726 if (orig_entry
->orig_node
== orig_node
) {
1727 vid
= tt_global_entry
->common
.vid
;
1728 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1729 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1731 tt_global_entry
->common
.addr
,
1732 BATADV_PRINT_VID(vid
), message
);
1733 _batadv_tt_global_del_orig_entry(tt_global_entry
,
1737 spin_unlock_bh(&tt_global_entry
->list_lock
);
1740 /* If the client is to be deleted, we check if it is the last origantor entry
1741 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1742 * timer, otherwise we simply remove the originator scheduled for deletion.
1745 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1746 struct batadv_tt_global_entry
*tt_global_entry
,
1747 struct batadv_orig_node
*orig_node
,
1748 const char *message
)
1750 bool last_entry
= true;
1751 struct hlist_head
*head
;
1752 struct batadv_tt_orig_list_entry
*orig_entry
;
1754 /* no local entry exists, case 1:
1755 * Check if this is the last one or if other entries exist.
1759 head
= &tt_global_entry
->orig_list
;
1760 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1761 if (orig_entry
->orig_node
!= orig_node
) {
1769 /* its the last one, mark for roaming. */
1770 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1771 tt_global_entry
->roam_at
= jiffies
;
1773 /* there is another entry, we can simply delete this
1774 * one and can still use the other one.
1776 batadv_tt_global_del_orig_node(bat_priv
, tt_global_entry
,
1777 orig_node
, message
);
1781 * batadv_tt_global_del - remove a client from the global table
1782 * @bat_priv: the bat priv with all the soft interface information
1783 * @orig_node: an originator serving this client
1784 * @addr: the mac address of the client
1785 * @vid: VLAN identifier
1786 * @message: a message explaining the reason for deleting the client to print
1787 * for debugging purpose
1788 * @roaming: true if the deletion has been triggered by a roaming event
1790 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1791 struct batadv_orig_node
*orig_node
,
1792 const unsigned char *addr
, unsigned short vid
,
1793 const char *message
, bool roaming
)
1795 struct batadv_tt_global_entry
*tt_global_entry
;
1796 struct batadv_tt_local_entry
*local_entry
= NULL
;
1798 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1799 if (!tt_global_entry
)
1803 batadv_tt_global_del_orig_node(bat_priv
, tt_global_entry
,
1804 orig_node
, message
);
1806 if (hlist_empty(&tt_global_entry
->orig_list
))
1807 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1813 /* if we are deleting a global entry due to a roam
1814 * event, there are two possibilities:
1815 * 1) the client roamed from node A to node B => if there
1816 * is only one originator left for this client, we mark
1817 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1818 * wait for node B to claim it. In case of timeout
1819 * the entry is purged.
1821 * If there are other originators left, we directly delete
1823 * 2) the client roamed to us => we can directly delete
1824 * the global entry, since it is useless now.
1826 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1827 tt_global_entry
->common
.addr
,
1830 /* local entry exists, case 2: client roamed to us. */
1831 batadv_tt_global_del_orig_list(tt_global_entry
);
1832 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1834 /* no local entry exists, case 1: check for roaming */
1835 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1836 orig_node
, message
);
1839 if (tt_global_entry
)
1840 batadv_tt_global_entry_free_ref(tt_global_entry
);
1842 batadv_tt_local_entry_free_ref(local_entry
);
1846 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1847 * given originator matching the provided vid
1848 * @bat_priv: the bat priv with all the soft interface information
1849 * @orig_node: the originator owning the entries to remove
1850 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1852 * @message: debug message to print as "reason"
1854 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1855 struct batadv_orig_node
*orig_node
,
1857 const char *message
)
1859 struct batadv_tt_global_entry
*tt_global
;
1860 struct batadv_tt_common_entry
*tt_common_entry
;
1862 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1863 struct hlist_node
*safe
;
1864 struct hlist_head
*head
;
1865 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1871 for (i
= 0; i
< hash
->size
; i
++) {
1872 head
= &hash
->table
[i
];
1873 list_lock
= &hash
->list_locks
[i
];
1875 spin_lock_bh(list_lock
);
1876 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1878 /* remove only matching entries */
1879 if (match_vid
>= 0 && tt_common_entry
->vid
!= match_vid
)
1882 tt_global
= container_of(tt_common_entry
,
1883 struct batadv_tt_global_entry
,
1886 batadv_tt_global_del_orig_node(bat_priv
, tt_global
,
1887 orig_node
, message
);
1889 if (hlist_empty(&tt_global
->orig_list
)) {
1890 vid
= tt_global
->common
.vid
;
1891 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1892 "Deleting global tt entry %pM (vid: %d): %s\n",
1893 tt_global
->common
.addr
,
1894 BATADV_PRINT_VID(vid
), message
);
1895 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1896 batadv_tt_global_entry_free_ref(tt_global
);
1899 spin_unlock_bh(list_lock
);
1901 clear_bit(BATADV_ORIG_CAPA_HAS_TT
, &orig_node
->capa_initialized
);
1904 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1908 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1909 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1911 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1912 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1914 *msg
= "Roaming timeout\n";
1917 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1918 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1920 *msg
= "Temporary client timeout\n";
1926 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1928 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1929 struct hlist_head
*head
;
1930 struct hlist_node
*node_tmp
;
1931 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1934 struct batadv_tt_common_entry
*tt_common
;
1935 struct batadv_tt_global_entry
*tt_global
;
1937 for (i
= 0; i
< hash
->size
; i
++) {
1938 head
= &hash
->table
[i
];
1939 list_lock
= &hash
->list_locks
[i
];
1941 spin_lock_bh(list_lock
);
1942 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
1944 tt_global
= container_of(tt_common
,
1945 struct batadv_tt_global_entry
,
1948 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1951 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1952 "Deleting global tt entry %pM (vid: %d): %s\n",
1953 tt_global
->common
.addr
,
1954 BATADV_PRINT_VID(tt_global
->common
.vid
),
1957 hlist_del_rcu(&tt_common
->hash_entry
);
1959 batadv_tt_global_entry_free_ref(tt_global
);
1961 spin_unlock_bh(list_lock
);
1965 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1967 struct batadv_hashtable
*hash
;
1968 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1969 struct batadv_tt_common_entry
*tt_common_entry
;
1970 struct batadv_tt_global_entry
*tt_global
;
1971 struct hlist_node
*node_tmp
;
1972 struct hlist_head
*head
;
1975 if (!bat_priv
->tt
.global_hash
)
1978 hash
= bat_priv
->tt
.global_hash
;
1980 for (i
= 0; i
< hash
->size
; i
++) {
1981 head
= &hash
->table
[i
];
1982 list_lock
= &hash
->list_locks
[i
];
1984 spin_lock_bh(list_lock
);
1985 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1987 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1988 tt_global
= container_of(tt_common_entry
,
1989 struct batadv_tt_global_entry
,
1991 batadv_tt_global_entry_free_ref(tt_global
);
1993 spin_unlock_bh(list_lock
);
1996 batadv_hash_destroy(hash
);
1998 bat_priv
->tt
.global_hash
= NULL
;
2002 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
2003 struct batadv_tt_global_entry
*tt_global_entry
)
2007 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
2008 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
2011 /* check if the two clients are marked as isolated */
2012 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
&&
2013 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
)
2020 * batadv_transtable_search - get the mesh destination for a given client
2021 * @bat_priv: the bat priv with all the soft interface information
2022 * @src: mac address of the source client
2023 * @addr: mac address of the destination client
2024 * @vid: VLAN identifier
2026 * Returns a pointer to the originator that was selected as destination in the
2027 * mesh for contacting the client 'addr', NULL otherwise.
2028 * In case of multiple originators serving the same client, the function returns
2029 * the best one (best in terms of metric towards the destination node).
2031 * If the two clients are AP isolated the function returns NULL.
2033 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
2038 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
2039 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
2040 struct batadv_orig_node
*orig_node
= NULL
;
2041 struct batadv_tt_orig_list_entry
*best_entry
;
2043 if (src
&& batadv_vlan_ap_isola_get(bat_priv
, vid
)) {
2044 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
, vid
);
2045 if (!tt_local_entry
||
2046 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
2050 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
2051 if (!tt_global_entry
)
2054 /* check whether the clients should not communicate due to AP
2057 if (tt_local_entry
&&
2058 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
2062 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
2063 /* found anything? */
2065 orig_node
= best_entry
->orig_node
;
2066 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
2071 if (tt_global_entry
)
2072 batadv_tt_global_entry_free_ref(tt_global_entry
);
2074 batadv_tt_local_entry_free_ref(tt_local_entry
);
2080 * batadv_tt_global_crc - calculates the checksum of the local table belonging
2081 * to the given orig_node
2082 * @bat_priv: the bat priv with all the soft interface information
2083 * @orig_node: originator for which the CRC should be computed
2084 * @vid: VLAN identifier for which the CRC32 has to be computed
2086 * This function computes the checksum for the global table corresponding to a
2087 * specific originator. In particular, the checksum is computed as follows: For
2088 * each client connected to the originator the CRC32C of the MAC address and the
2089 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2092 * The idea behind is that CRC32C should be used as much as possible in order to
2093 * produce a unique hash of the table, but since the order which is used to feed
2094 * the CRC32C function affects the result and since every node in the network
2095 * probably sorts the clients differently, the hash function cannot be directly
2096 * computed over the entire table. Hence the CRC32C is used only on
2097 * the single client entry, while all the results are then xor'ed together
2098 * because the XOR operation can combine them all while trying to reduce the
2099 * noise as much as possible.
2101 * Returns the checksum of the global table of a given originator.
2103 static u32
batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
2104 struct batadv_orig_node
*orig_node
,
2107 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
2108 struct batadv_tt_common_entry
*tt_common
;
2109 struct batadv_tt_global_entry
*tt_global
;
2110 struct hlist_head
*head
;
2111 u32 i
, crc_tmp
, crc
= 0;
2115 for (i
= 0; i
< hash
->size
; i
++) {
2116 head
= &hash
->table
[i
];
2119 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2120 tt_global
= container_of(tt_common
,
2121 struct batadv_tt_global_entry
,
2123 /* compute the CRC only for entries belonging to the
2124 * VLAN identified by the vid passed as parameter
2126 if (tt_common
->vid
!= vid
)
2129 /* Roaming clients are in the global table for
2130 * consistency only. They don't have to be
2131 * taken into account while computing the
2134 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
2136 /* Temporary clients have not been announced yet, so
2137 * they have to be skipped while computing the global
2140 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
2143 /* find out if this global entry is announced by this
2146 if (!batadv_tt_global_entry_has_orig(tt_global
,
2150 /* use network order to read the VID: this ensures that
2151 * every node reads the bytes in the same order.
2153 tmp_vid
= htons(tt_common
->vid
);
2154 crc_tmp
= crc32c(0, &tmp_vid
, sizeof(tmp_vid
));
2156 /* compute the CRC on flags that have to be kept in sync
2159 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2160 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2162 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2171 * batadv_tt_local_crc - calculates the checksum of the local table
2172 * @bat_priv: the bat priv with all the soft interface information
2173 * @vid: VLAN identifier for which the CRC32 has to be computed
2175 * For details about the computation, please refer to the documentation for
2176 * batadv_tt_global_crc().
2178 * Returns the checksum of the local table
2180 static u32
batadv_tt_local_crc(struct batadv_priv
*bat_priv
,
2183 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2184 struct batadv_tt_common_entry
*tt_common
;
2185 struct hlist_head
*head
;
2186 u32 i
, crc_tmp
, crc
= 0;
2190 for (i
= 0; i
< hash
->size
; i
++) {
2191 head
= &hash
->table
[i
];
2194 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2195 /* compute the CRC only for entries belonging to the
2196 * VLAN identified by vid
2198 if (tt_common
->vid
!= vid
)
2201 /* not yet committed clients have not to be taken into
2202 * account while computing the CRC
2204 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
2207 /* use network order to read the VID: this ensures that
2208 * every node reads the bytes in the same order.
2210 tmp_vid
= htons(tt_common
->vid
);
2211 crc_tmp
= crc32c(0, &tmp_vid
, sizeof(tmp_vid
));
2213 /* compute the CRC on flags that have to be kept in sync
2216 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2217 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2219 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2227 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
2229 struct batadv_tt_req_node
*node
;
2230 struct hlist_node
*safe
;
2232 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2234 hlist_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2235 hlist_del_init(&node
->list
);
2239 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2242 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
2243 struct batadv_orig_node
*orig_node
,
2244 const void *tt_buff
,
2247 /* Replace the old buffer only if I received something in the
2248 * last OGM (the OGM could carry no changes)
2250 spin_lock_bh(&orig_node
->tt_buff_lock
);
2251 if (tt_buff_len
> 0) {
2252 kfree(orig_node
->tt_buff
);
2253 orig_node
->tt_buff_len
= 0;
2254 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
2255 if (orig_node
->tt_buff
) {
2256 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
2257 orig_node
->tt_buff_len
= tt_buff_len
;
2260 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2263 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
2265 struct batadv_tt_req_node
*node
;
2266 struct hlist_node
*safe
;
2268 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2269 hlist_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2270 if (batadv_has_timed_out(node
->issued_at
,
2271 BATADV_TT_REQUEST_TIMEOUT
)) {
2272 hlist_del_init(&node
->list
);
2276 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2280 * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2281 * @bat_priv: the bat priv with all the soft interface information
2282 * @orig_node: orig node this request is being issued for
2284 * Returns the pointer to the new tt_req_node struct if no request
2285 * has already been issued for this orig_node, NULL otherwise.
2287 static struct batadv_tt_req_node
*
2288 batadv_tt_req_node_new(struct batadv_priv
*bat_priv
,
2289 struct batadv_orig_node
*orig_node
)
2291 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
2293 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2294 hlist_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
2295 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
2296 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
2297 BATADV_TT_REQUEST_TIMEOUT
))
2301 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
2305 ether_addr_copy(tt_req_node
->addr
, orig_node
->orig
);
2306 tt_req_node
->issued_at
= jiffies
;
2308 hlist_add_head(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
2310 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2315 * batadv_tt_local_valid - verify that given tt entry is a valid one
2316 * @entry_ptr: to be checked local tt entry
2317 * @data_ptr: not used but definition required to satisfy the callback prototype
2319 * Returns 1 if the entry is a valid, 0 otherwise.
2321 static int batadv_tt_local_valid(const void *entry_ptr
, const void *data_ptr
)
2323 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2325 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
2330 static int batadv_tt_global_valid(const void *entry_ptr
,
2331 const void *data_ptr
)
2333 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2334 const struct batadv_tt_global_entry
*tt_global_entry
;
2335 const struct batadv_orig_node
*orig_node
= data_ptr
;
2337 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
2338 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
2341 tt_global_entry
= container_of(tt_common_entry
,
2342 struct batadv_tt_global_entry
,
2345 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
2349 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2351 * @bat_priv: the bat priv with all the soft interface information
2352 * @hash: hash table containing the tt entries
2353 * @tt_len: expected tvlv tt data buffer length in number of bytes
2354 * @tvlv_buff: pointer to the buffer to fill with the TT data
2355 * @valid_cb: function to filter tt change entries
2356 * @cb_data: data passed to the filter function as argument
2358 static void batadv_tt_tvlv_generate(struct batadv_priv
*bat_priv
,
2359 struct batadv_hashtable
*hash
,
2360 void *tvlv_buff
, u16 tt_len
,
2361 int (*valid_cb
)(const void *, const void *),
2364 struct batadv_tt_common_entry
*tt_common_entry
;
2365 struct batadv_tvlv_tt_change
*tt_change
;
2366 struct hlist_head
*head
;
2367 u16 tt_tot
, tt_num_entries
= 0;
2370 tt_tot
= batadv_tt_entries(tt_len
);
2371 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_buff
;
2374 for (i
= 0; i
< hash
->size
; i
++) {
2375 head
= &hash
->table
[i
];
2377 hlist_for_each_entry_rcu(tt_common_entry
,
2379 if (tt_tot
== tt_num_entries
)
2382 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
2385 ether_addr_copy(tt_change
->addr
, tt_common_entry
->addr
);
2386 tt_change
->flags
= tt_common_entry
->flags
;
2387 tt_change
->vid
= htons(tt_common_entry
->vid
);
2388 memset(tt_change
->reserved
, 0,
2389 sizeof(tt_change
->reserved
));
2399 * batadv_tt_global_check_crc - check if all the CRCs are correct
2400 * @orig_node: originator for which the CRCs have to be checked
2401 * @tt_vlan: pointer to the first tvlv VLAN entry
2402 * @num_vlan: number of tvlv VLAN entries
2403 * @create: if true, create VLAN objects if not found
2405 * Return true if all the received CRCs match the locally stored ones, false
2408 static bool batadv_tt_global_check_crc(struct batadv_orig_node
*orig_node
,
2409 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2412 struct batadv_tvlv_tt_vlan_data
*tt_vlan_tmp
;
2413 struct batadv_orig_node_vlan
*vlan
;
2417 /* check if each received CRC matches the locally stored one */
2418 for (i
= 0; i
< num_vlan
; i
++) {
2419 tt_vlan_tmp
= tt_vlan
+ i
;
2421 /* if orig_node is a backbone node for this VLAN, don't check
2422 * the CRC as we ignore all the global entries over it
2424 if (batadv_bla_is_backbone_gw_orig(orig_node
->bat_priv
,
2426 ntohs(tt_vlan_tmp
->vid
)))
2429 vlan
= batadv_orig_node_vlan_get(orig_node
,
2430 ntohs(tt_vlan_tmp
->vid
));
2435 batadv_orig_node_vlan_free_ref(vlan
);
2437 if (crc
!= ntohl(tt_vlan_tmp
->crc
))
2445 * batadv_tt_local_update_crc - update all the local CRCs
2446 * @bat_priv: the bat priv with all the soft interface information
2448 static void batadv_tt_local_update_crc(struct batadv_priv
*bat_priv
)
2450 struct batadv_softif_vlan
*vlan
;
2452 /* recompute the global CRC for each VLAN */
2454 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
2455 vlan
->tt
.crc
= batadv_tt_local_crc(bat_priv
, vlan
->vid
);
2461 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2462 * @bat_priv: the bat priv with all the soft interface information
2463 * @orig_node: the orig_node for which the CRCs have to be updated
2465 static void batadv_tt_global_update_crc(struct batadv_priv
*bat_priv
,
2466 struct batadv_orig_node
*orig_node
)
2468 struct batadv_orig_node_vlan
*vlan
;
2471 /* recompute the global CRC for each VLAN */
2473 hlist_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
2474 /* if orig_node is a backbone node for this VLAN, don't compute
2475 * the CRC as we ignore all the global entries over it
2477 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
,
2481 crc
= batadv_tt_global_crc(bat_priv
, orig_node
, vlan
->vid
);
2488 * batadv_send_tt_request - send a TT Request message to a given node
2489 * @bat_priv: the bat priv with all the soft interface information
2490 * @dst_orig_node: the destination of the message
2491 * @ttvn: the version number that the source of the message is looking for
2492 * @tt_vlan: pointer to the first tvlv VLAN object to request
2493 * @num_vlan: number of tvlv VLAN entries
2494 * @full_table: ask for the entire translation table if true, while only for the
2495 * last TT diff otherwise
2497 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
2498 struct batadv_orig_node
*dst_orig_node
,
2500 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2501 u16 num_vlan
, bool full_table
)
2503 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2504 struct batadv_tt_req_node
*tt_req_node
= NULL
;
2505 struct batadv_tvlv_tt_vlan_data
*tt_vlan_req
;
2506 struct batadv_hard_iface
*primary_if
;
2510 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2514 /* The new tt_req will be issued only if I'm not waiting for a
2515 * reply from the same orig_node yet
2517 tt_req_node
= batadv_tt_req_node_new(bat_priv
, dst_orig_node
);
2521 size
= sizeof(*tvlv_tt_data
) + sizeof(*tt_vlan_req
) * num_vlan
;
2522 tvlv_tt_data
= kzalloc(size
, GFP_ATOMIC
);
2526 tvlv_tt_data
->flags
= BATADV_TT_REQUEST
;
2527 tvlv_tt_data
->ttvn
= ttvn
;
2528 tvlv_tt_data
->num_vlan
= htons(num_vlan
);
2530 /* send all the CRCs within the request. This is needed by intermediate
2531 * nodes to ensure they have the correct table before replying
2533 tt_vlan_req
= (struct batadv_tvlv_tt_vlan_data
*)(tvlv_tt_data
+ 1);
2534 for (i
= 0; i
< num_vlan
; i
++) {
2535 tt_vlan_req
->vid
= tt_vlan
->vid
;
2536 tt_vlan_req
->crc
= tt_vlan
->crc
;
2543 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2545 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
2546 dst_orig_node
->orig
, full_table
? 'F' : '.');
2548 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
2549 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2550 dst_orig_node
->orig
, BATADV_TVLV_TT
, 1,
2551 tvlv_tt_data
, size
);
2556 batadv_hardif_free_ref(primary_if
);
2557 if (ret
&& tt_req_node
) {
2558 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2559 /* hlist_del_init() verifies tt_req_node still is in the list */
2560 hlist_del_init(&tt_req_node
->list
);
2561 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2564 kfree(tvlv_tt_data
);
2569 * batadv_send_other_tt_response - send reply to tt request concerning another
2570 * node's translation table
2571 * @bat_priv: the bat priv with all the soft interface information
2572 * @tt_data: tt data containing the tt request information
2573 * @req_src: mac address of tt request sender
2574 * @req_dst: mac address of tt request recipient
2576 * Returns true if tt request reply was sent, false otherwise.
2578 static bool batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
2579 struct batadv_tvlv_tt_data
*tt_data
,
2580 u8
*req_src
, u8
*req_dst
)
2582 struct batadv_orig_node
*req_dst_orig_node
;
2583 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
2584 struct batadv_tvlv_tt_change
*tt_change
;
2585 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2586 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
2587 bool ret
= false, full_table
;
2588 u8 orig_ttvn
, req_ttvn
;
2592 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2593 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2594 req_src
, tt_data
->ttvn
, req_dst
,
2595 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
2597 /* Let's get the orig node of the REAL destination */
2598 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_dst
);
2599 if (!req_dst_orig_node
)
2602 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2603 if (!res_dst_orig_node
)
2606 orig_ttvn
= (u8
)atomic_read(&req_dst_orig_node
->last_ttvn
);
2607 req_ttvn
= tt_data
->ttvn
;
2609 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
2610 /* this node doesn't have the requested data */
2611 if (orig_ttvn
!= req_ttvn
||
2612 !batadv_tt_global_check_crc(req_dst_orig_node
, tt_vlan
,
2613 ntohs(tt_data
->num_vlan
)))
2616 /* If the full table has been explicitly requested */
2617 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
||
2618 !req_dst_orig_node
->tt_buff
)
2623 /* TT fragmentation hasn't been implemented yet, so send as many
2624 * TT entries fit a single packet as possible only
2627 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
2628 tt_len
= req_dst_orig_node
->tt_buff_len
;
2630 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2637 /* Copy the last orig_node's OGM buffer */
2638 memcpy(tt_change
, req_dst_orig_node
->tt_buff
,
2639 req_dst_orig_node
->tt_buff_len
);
2640 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2642 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2643 * in the initial part
2646 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2653 /* fill the rest of the tvlv with the real TT entries */
2654 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.global_hash
,
2656 batadv_tt_global_valid
,
2660 /* Don't send the response, if larger than fragmented packet. */
2661 tt_len
= sizeof(struct batadv_unicast_tvlv_packet
) + tvlv_len
;
2662 if (tt_len
> atomic_read(&bat_priv
->packet_size_max
)) {
2663 net_ratelimited_function(batadv_info
, bat_priv
->soft_iface
,
2664 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2665 res_dst_orig_node
->orig
);
2669 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2670 tvlv_tt_data
->ttvn
= req_ttvn
;
2673 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2675 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2676 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2677 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
,
2678 full_table
? 'F' : '.', req_ttvn
);
2680 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2682 batadv_tvlv_unicast_send(bat_priv
, req_dst_orig_node
->orig
,
2683 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2690 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2693 if (res_dst_orig_node
)
2694 batadv_orig_node_free_ref(res_dst_orig_node
);
2695 if (req_dst_orig_node
)
2696 batadv_orig_node_free_ref(req_dst_orig_node
);
2697 kfree(tvlv_tt_data
);
2702 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2704 * @bat_priv: the bat priv with all the soft interface information
2705 * @tt_data: tt data containing the tt request information
2706 * @req_src: mac address of tt request sender
2708 * Returns true if tt request reply was sent, false otherwise.
2710 static bool batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
2711 struct batadv_tvlv_tt_data
*tt_data
,
2714 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2715 struct batadv_hard_iface
*primary_if
= NULL
;
2716 struct batadv_tvlv_tt_change
*tt_change
;
2717 struct batadv_orig_node
*orig_node
;
2718 u8 my_ttvn
, req_ttvn
;
2723 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2724 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2725 req_src
, tt_data
->ttvn
,
2726 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
2728 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2730 my_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
2731 req_ttvn
= tt_data
->ttvn
;
2733 orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2737 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2741 /* If the full table has been explicitly requested or the gap
2742 * is too big send the whole local translation table
2744 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
2745 !bat_priv
->tt
.last_changeset
)
2750 /* TT fragmentation hasn't been implemented yet, so send as many
2751 * TT entries fit a single packet as possible only
2754 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
2756 tt_len
= bat_priv
->tt
.last_changeset_len
;
2757 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2764 /* Copy the last orig_node's OGM buffer */
2765 memcpy(tt_change
, bat_priv
->tt
.last_changeset
,
2766 bat_priv
->tt
.last_changeset_len
);
2767 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2769 req_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
2771 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2772 * in the initial part
2775 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2782 /* fill the rest of the tvlv with the real TT entries */
2783 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.local_hash
,
2785 batadv_tt_local_valid
, NULL
);
2788 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2789 tvlv_tt_data
->ttvn
= req_ttvn
;
2792 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2794 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2795 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2796 orig_node
->orig
, full_table
? 'F' : '.', req_ttvn
);
2798 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2800 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2801 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2807 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2809 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2811 batadv_orig_node_free_ref(orig_node
);
2813 batadv_hardif_free_ref(primary_if
);
2814 kfree(tvlv_tt_data
);
2815 /* The packet was for this host, so it doesn't need to be re-routed */
2820 * batadv_send_tt_response - send reply to tt request
2821 * @bat_priv: the bat priv with all the soft interface information
2822 * @tt_data: tt data containing the tt request information
2823 * @req_src: mac address of tt request sender
2824 * @req_dst: mac address of tt request recipient
2826 * Returns true if tt request reply was sent, false otherwise.
2828 static bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
2829 struct batadv_tvlv_tt_data
*tt_data
,
2830 u8
*req_src
, u8
*req_dst
)
2832 if (batadv_is_my_mac(bat_priv
, req_dst
))
2833 return batadv_send_my_tt_response(bat_priv
, tt_data
, req_src
);
2834 return batadv_send_other_tt_response(bat_priv
, tt_data
, req_src
,
2838 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2839 struct batadv_orig_node
*orig_node
,
2840 struct batadv_tvlv_tt_change
*tt_change
,
2841 u16 tt_num_changes
, u8 ttvn
)
2846 for (i
= 0; i
< tt_num_changes
; i
++) {
2847 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
2848 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
2849 batadv_tt_global_del(bat_priv
, orig_node
,
2850 (tt_change
+ i
)->addr
,
2851 ntohs((tt_change
+ i
)->vid
),
2852 "tt removed by changes",
2855 if (!batadv_tt_global_add(bat_priv
, orig_node
,
2856 (tt_change
+ i
)->addr
,
2857 ntohs((tt_change
+ i
)->vid
),
2858 (tt_change
+ i
)->flags
, ttvn
))
2859 /* In case of problem while storing a
2860 * global_entry, we stop the updating
2861 * procedure without committing the
2862 * ttvn change. This will avoid to send
2863 * corrupted data on tt_request
2868 set_bit(BATADV_ORIG_CAPA_HAS_TT
, &orig_node
->capa_initialized
);
2871 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
2872 struct batadv_tvlv_tt_change
*tt_change
,
2873 u8 ttvn
, u8
*resp_src
,
2876 struct batadv_orig_node
*orig_node
;
2878 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2882 /* Purge the old table first.. */
2883 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
2884 "Received full table");
2886 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
, num_entries
,
2889 spin_lock_bh(&orig_node
->tt_buff_lock
);
2890 kfree(orig_node
->tt_buff
);
2891 orig_node
->tt_buff_len
= 0;
2892 orig_node
->tt_buff
= NULL
;
2893 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2895 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2899 batadv_orig_node_free_ref(orig_node
);
2902 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2903 struct batadv_orig_node
*orig_node
,
2904 u16 tt_num_changes
, u8 ttvn
,
2905 struct batadv_tvlv_tt_change
*tt_change
)
2907 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2908 tt_num_changes
, ttvn
);
2910 batadv_tt_save_orig_buffer(bat_priv
, orig_node
, tt_change
,
2911 batadv_tt_len(tt_num_changes
));
2912 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2916 * batadv_is_my_client - check if a client is served by the local node
2917 * @bat_priv: the bat priv with all the soft interface information
2918 * @addr: the mac address of the client to check
2919 * @vid: VLAN identifier
2921 * Returns true if the client is served by this node, false otherwise.
2923 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const u8
*addr
,
2926 struct batadv_tt_local_entry
*tt_local_entry
;
2929 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
2930 if (!tt_local_entry
)
2932 /* Check if the client has been logically deleted (but is kept for
2933 * consistency purpose)
2935 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2936 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2941 batadv_tt_local_entry_free_ref(tt_local_entry
);
2946 * batadv_handle_tt_response - process incoming tt reply
2947 * @bat_priv: the bat priv with all the soft interface information
2948 * @tt_data: tt data containing the tt request information
2949 * @resp_src: mac address of tt reply sender
2950 * @num_entries: number of tt change entries appended to the tt data
2952 static void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2953 struct batadv_tvlv_tt_data
*tt_data
,
2954 u8
*resp_src
, u16 num_entries
)
2956 struct batadv_tt_req_node
*node
;
2957 struct hlist_node
*safe
;
2958 struct batadv_orig_node
*orig_node
= NULL
;
2959 struct batadv_tvlv_tt_change
*tt_change
;
2960 u8
*tvlv_ptr
= (u8
*)tt_data
;
2963 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2964 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2965 resp_src
, tt_data
->ttvn
, num_entries
,
2966 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
2968 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2972 spin_lock_bh(&orig_node
->tt_lock
);
2974 change_offset
= sizeof(struct batadv_tvlv_tt_vlan_data
);
2975 change_offset
*= ntohs(tt_data
->num_vlan
);
2976 change_offset
+= sizeof(*tt_data
);
2977 tvlv_ptr
+= change_offset
;
2979 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_ptr
;
2980 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
) {
2981 batadv_tt_fill_gtable(bat_priv
, tt_change
, tt_data
->ttvn
,
2982 resp_src
, num_entries
);
2984 batadv_tt_update_changes(bat_priv
, orig_node
, num_entries
,
2985 tt_data
->ttvn
, tt_change
);
2988 /* Recalculate the CRC for this orig_node and store it */
2989 batadv_tt_global_update_crc(bat_priv
, orig_node
);
2991 spin_unlock_bh(&orig_node
->tt_lock
);
2993 /* Delete the tt_req_node from pending tt_requests list */
2994 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2995 hlist_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2996 if (!batadv_compare_eth(node
->addr
, resp_src
))
2998 hlist_del_init(&node
->list
);
3002 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
3005 batadv_orig_node_free_ref(orig_node
);
3008 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
3010 struct batadv_tt_roam_node
*node
, *safe
;
3012 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
3014 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
3015 list_del(&node
->list
);
3019 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
3022 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
3024 struct batadv_tt_roam_node
*node
, *safe
;
3026 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
3027 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
3028 if (!batadv_has_timed_out(node
->first_time
,
3029 BATADV_ROAMING_MAX_TIME
))
3032 list_del(&node
->list
);
3035 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
3038 /* This function checks whether the client already reached the
3039 * maximum number of possible roaming phases. In this case the ROAMING_ADV
3042 * returns true if the ROAMING_ADV can be sent, false otherwise
3044 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
, u8
*client
)
3046 struct batadv_tt_roam_node
*tt_roam_node
;
3049 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
3050 /* The new tt_req will be issued only if I'm not waiting for a
3051 * reply from the same orig_node yet
3053 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
3054 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
3057 if (batadv_has_timed_out(tt_roam_node
->first_time
,
3058 BATADV_ROAMING_MAX_TIME
))
3061 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
3062 /* Sorry, you roamed too many times! */
3069 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
3073 tt_roam_node
->first_time
= jiffies
;
3074 atomic_set(&tt_roam_node
->counter
,
3075 BATADV_ROAMING_MAX_COUNT
- 1);
3076 ether_addr_copy(tt_roam_node
->addr
, client
);
3078 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
3083 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
3088 * batadv_send_roam_adv - send a roaming advertisement message
3089 * @bat_priv: the bat priv with all the soft interface information
3090 * @client: mac address of the roaming client
3091 * @vid: VLAN identifier
3092 * @orig_node: message destination
3094 * Send a ROAMING_ADV message to the node which was previously serving this
3095 * client. This is done to inform the node that from now on all traffic destined
3096 * for this particular roamed client has to be forwarded to the sender of the
3099 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, u8
*client
,
3101 struct batadv_orig_node
*orig_node
)
3103 struct batadv_hard_iface
*primary_if
;
3104 struct batadv_tvlv_roam_adv tvlv_roam
;
3106 primary_if
= batadv_primary_if_get_selected(bat_priv
);
3110 /* before going on we have to check whether the client has
3111 * already roamed to us too many times
3113 if (!batadv_tt_check_roam_count(bat_priv
, client
))
3116 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3117 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3118 orig_node
->orig
, client
, BATADV_PRINT_VID(vid
));
3120 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
3122 memcpy(tvlv_roam
.client
, client
, sizeof(tvlv_roam
.client
));
3123 tvlv_roam
.vid
= htons(vid
);
3125 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
3126 orig_node
->orig
, BATADV_TVLV_ROAM
, 1,
3127 &tvlv_roam
, sizeof(tvlv_roam
));
3131 batadv_hardif_free_ref(primary_if
);
3134 static void batadv_tt_purge(struct work_struct
*work
)
3136 struct delayed_work
*delayed_work
;
3137 struct batadv_priv_tt
*priv_tt
;
3138 struct batadv_priv
*bat_priv
;
3140 delayed_work
= container_of(work
, struct delayed_work
, work
);
3141 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
3142 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
3144 batadv_tt_local_purge(bat_priv
, BATADV_TT_LOCAL_TIMEOUT
);
3145 batadv_tt_global_purge(bat_priv
);
3146 batadv_tt_req_purge(bat_priv
);
3147 batadv_tt_roam_purge(bat_priv
);
3149 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3150 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3153 void batadv_tt_free(struct batadv_priv
*bat_priv
)
3155 batadv_tvlv_container_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3156 batadv_tvlv_handler_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3158 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
3160 batadv_tt_local_table_free(bat_priv
);
3161 batadv_tt_global_table_free(bat_priv
);
3162 batadv_tt_req_list_free(bat_priv
);
3163 batadv_tt_changes_list_free(bat_priv
);
3164 batadv_tt_roam_list_free(bat_priv
);
3166 kfree(bat_priv
->tt
.last_changeset
);
3170 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3171 * table and possibly count them in the TT size
3172 * @bat_priv: the bat priv with all the soft interface information
3173 * @flags: the flag to switch
3174 * @enable: whether to set or unset the flag
3175 * @count: whether to increase the TT size by the number of changed entries
3177 static void batadv_tt_local_set_flags(struct batadv_priv
*bat_priv
, u16 flags
,
3178 bool enable
, bool count
)
3180 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3181 struct batadv_tt_common_entry
*tt_common_entry
;
3182 u16 changed_num
= 0;
3183 struct hlist_head
*head
;
3189 for (i
= 0; i
< hash
->size
; i
++) {
3190 head
= &hash
->table
[i
];
3193 hlist_for_each_entry_rcu(tt_common_entry
,
3196 if ((tt_common_entry
->flags
& flags
) == flags
)
3198 tt_common_entry
->flags
|= flags
;
3200 if (!(tt_common_entry
->flags
& flags
))
3202 tt_common_entry
->flags
&= ~flags
;
3209 batadv_tt_local_size_inc(bat_priv
,
3210 tt_common_entry
->vid
);
3216 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3217 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
3219 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3220 struct batadv_tt_common_entry
*tt_common
;
3221 struct batadv_tt_local_entry
*tt_local
;
3222 struct batadv_softif_vlan
*vlan
;
3223 struct hlist_node
*node_tmp
;
3224 struct hlist_head
*head
;
3225 spinlock_t
*list_lock
; /* protects write access to the hash lists */
3231 for (i
= 0; i
< hash
->size
; i
++) {
3232 head
= &hash
->table
[i
];
3233 list_lock
= &hash
->list_locks
[i
];
3235 spin_lock_bh(list_lock
);
3236 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
3238 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
3241 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3242 "Deleting local tt entry (%pM, vid: %d): pending\n",
3244 BATADV_PRINT_VID(tt_common
->vid
));
3246 batadv_tt_local_size_dec(bat_priv
, tt_common
->vid
);
3247 hlist_del_rcu(&tt_common
->hash_entry
);
3248 tt_local
= container_of(tt_common
,
3249 struct batadv_tt_local_entry
,
3252 /* decrease the reference held for this vlan */
3253 vlan
= batadv_softif_vlan_get(bat_priv
, tt_common
->vid
);
3255 batadv_softif_vlan_free_ref(vlan
);
3256 batadv_softif_vlan_free_ref(vlan
);
3259 batadv_tt_local_entry_free_ref(tt_local
);
3261 spin_unlock_bh(list_lock
);
3266 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3267 * which have been queued in the time since the last commit
3268 * @bat_priv: the bat priv with all the soft interface information
3270 * Caller must hold tt->commit_lock.
3272 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv
*bat_priv
)
3274 lockdep_assert_held(&bat_priv
->tt
.commit_lock
);
3276 /* Update multicast addresses in local translation table */
3277 batadv_mcast_mla_update(bat_priv
);
3279 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1) {
3280 if (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))
3281 batadv_tt_tvlv_container_update(bat_priv
);
3285 batadv_tt_local_set_flags(bat_priv
, BATADV_TT_CLIENT_NEW
, false, true);
3287 batadv_tt_local_purge_pending_clients(bat_priv
);
3288 batadv_tt_local_update_crc(bat_priv
);
3290 /* Increment the TTVN only once per OGM interval */
3291 atomic_inc(&bat_priv
->tt
.vn
);
3292 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3293 "Local changes committed, updating to ttvn %u\n",
3294 (u8
)atomic_read(&bat_priv
->tt
.vn
));
3296 /* reset the sending counter */
3297 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
3298 batadv_tt_tvlv_container_update(bat_priv
);
3302 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3303 * have been queued in the time since the last commit
3304 * @bat_priv: the bat priv with all the soft interface information
3306 void batadv_tt_local_commit_changes(struct batadv_priv
*bat_priv
)
3308 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3309 batadv_tt_local_commit_changes_nolock(bat_priv
);
3310 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3313 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, u8
*src
, u8
*dst
,
3316 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
3317 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
3318 struct batadv_softif_vlan
*vlan
;
3321 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
3322 if (!vlan
|| !atomic_read(&vlan
->ap_isolation
))
3325 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
, vid
);
3326 if (!tt_local_entry
)
3329 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
, vid
);
3330 if (!tt_global_entry
)
3333 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
3340 batadv_softif_vlan_free_ref(vlan
);
3341 if (tt_global_entry
)
3342 batadv_tt_global_entry_free_ref(tt_global_entry
);
3344 batadv_tt_local_entry_free_ref(tt_local_entry
);
3349 * batadv_tt_update_orig - update global translation table with new tt
3350 * information received via ogms
3351 * @bat_priv: the bat priv with all the soft interface information
3352 * @orig: the orig_node of the ogm
3353 * @tt_vlan: pointer to the first tvlv VLAN entry
3354 * @tt_num_vlan: number of tvlv VLAN entries
3355 * @tt_change: pointer to the first entry in the TT buffer
3356 * @tt_num_changes: number of tt changes inside the tt buffer
3357 * @ttvn: translation table version number of this changeset
3358 * @tt_crc: crc32 checksum of orig node's translation table
3360 static void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
3361 struct batadv_orig_node
*orig_node
,
3362 const void *tt_buff
, u16 tt_num_vlan
,
3363 struct batadv_tvlv_tt_change
*tt_change
,
3364 u16 tt_num_changes
, u8 ttvn
)
3366 u8 orig_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
3367 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3368 bool full_table
= true;
3371 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)tt_buff
;
3372 has_tt_init
= test_bit(BATADV_ORIG_CAPA_HAS_TT
,
3373 &orig_node
->capa_initialized
);
3375 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3376 * increased by one -> we can apply the attached changes
3378 if ((!has_tt_init
&& ttvn
== 1) || ttvn
- orig_ttvn
== 1) {
3379 /* the OGM could not contain the changes due to their size or
3380 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3382 * In this case send a tt request
3384 if (!tt_num_changes
) {
3389 spin_lock_bh(&orig_node
->tt_lock
);
3391 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
3394 /* Even if we received the precomputed crc with the OGM, we
3395 * prefer to recompute it to spot any possible inconsistency
3396 * in the global table
3398 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3400 spin_unlock_bh(&orig_node
->tt_lock
);
3402 /* The ttvn alone is not enough to guarantee consistency
3403 * because a single value could represent different states
3404 * (due to the wrap around). Thus a node has to check whether
3405 * the resulting table (after applying the changes) is still
3406 * consistent or not. E.g. a node could disconnect while its
3407 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3408 * checking the CRC value is mandatory to detect the
3411 if (!batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3415 /* if we missed more than one change or our tables are not
3416 * in sync anymore -> request fresh tt data
3418 if (!has_tt_init
|| ttvn
!= orig_ttvn
||
3419 !batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3422 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3423 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3424 orig_node
->orig
, ttvn
, orig_ttvn
,
3426 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
3427 tt_vlan
, tt_num_vlan
,
3435 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3436 * @bat_priv: the bat priv with all the soft interface information
3437 * @addr: the mac address of the client to check
3438 * @vid: VLAN identifier
3440 * Returns true if we know that the client has moved from its old originator
3441 * to another one. This entry is still kept for consistency purposes and will be
3442 * deleted later by a DEL or because of timeout
3444 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
3445 u8
*addr
, unsigned short vid
)
3447 struct batadv_tt_global_entry
*tt_global_entry
;
3450 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3451 if (!tt_global_entry
)
3454 ret
= tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3455 batadv_tt_global_entry_free_ref(tt_global_entry
);
3461 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3462 * @bat_priv: the bat priv with all the soft interface information
3463 * @addr: the mac address of the local client to query
3464 * @vid: VLAN identifier
3466 * Returns true if the local client is known to be roaming (it is not served by
3467 * this node anymore) or not. If yes, the client is still present in the table
3468 * to keep the latter consistent with the node TTVN
3470 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
3471 u8
*addr
, unsigned short vid
)
3473 struct batadv_tt_local_entry
*tt_local_entry
;
3476 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3477 if (!tt_local_entry
)
3480 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3481 batadv_tt_local_entry_free_ref(tt_local_entry
);
3486 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
3487 struct batadv_orig_node
*orig_node
,
3488 const unsigned char *addr
,
3493 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
, vid
,
3494 BATADV_TT_CLIENT_TEMP
,
3495 atomic_read(&orig_node
->last_ttvn
)))
3498 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3499 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3500 addr
, BATADV_PRINT_VID(vid
), orig_node
->orig
);
3507 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3508 * maximum packet size that can be transported through the mesh
3509 * @soft_iface: netdev struct of the mesh interface
3511 * Remove entries older than 'timeout' and half timeout if more entries need
3514 void batadv_tt_local_resize_to_mtu(struct net_device
*soft_iface
)
3516 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
3517 int packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
3518 int table_size
, timeout
= BATADV_TT_LOCAL_TIMEOUT
/ 2;
3519 bool reduced
= false;
3521 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3524 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
3525 if (packet_size_max
>= table_size
)
3528 batadv_tt_local_purge(bat_priv
, timeout
);
3529 batadv_tt_local_purge_pending_clients(bat_priv
);
3533 net_ratelimited_function(batadv_info
, soft_iface
,
3534 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3538 /* commit these changes immediately, to avoid synchronization problem
3542 batadv_tt_local_commit_changes_nolock(bat_priv
);
3544 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3548 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3549 * @bat_priv: the bat priv with all the soft interface information
3550 * @orig: the orig_node of the ogm
3551 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3552 * @tvlv_value: tvlv buffer containing the gateway data
3553 * @tvlv_value_len: tvlv buffer length
3555 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv
*bat_priv
,
3556 struct batadv_orig_node
*orig
,
3557 u8 flags
, void *tvlv_value
,
3560 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3561 struct batadv_tvlv_tt_change
*tt_change
;
3562 struct batadv_tvlv_tt_data
*tt_data
;
3563 u16 num_entries
, num_vlan
;
3565 if (tvlv_value_len
< sizeof(*tt_data
))
3568 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3569 tvlv_value_len
-= sizeof(*tt_data
);
3571 num_vlan
= ntohs(tt_data
->num_vlan
);
3573 if (tvlv_value_len
< sizeof(*tt_vlan
) * num_vlan
)
3576 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
3577 tt_change
= (struct batadv_tvlv_tt_change
*)(tt_vlan
+ num_vlan
);
3578 tvlv_value_len
-= sizeof(*tt_vlan
) * num_vlan
;
3580 num_entries
= batadv_tt_entries(tvlv_value_len
);
3582 batadv_tt_update_orig(bat_priv
, orig
, tt_vlan
, num_vlan
, tt_change
,
3583 num_entries
, tt_data
->ttvn
);
3587 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3589 * @bat_priv: the bat priv with all the soft interface information
3590 * @src: mac address of tt tvlv sender
3591 * @dst: mac address of tt tvlv recipient
3592 * @tvlv_value: tvlv buffer containing the tt data
3593 * @tvlv_value_len: tvlv buffer length
3595 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3598 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3603 struct batadv_tvlv_tt_data
*tt_data
;
3604 u16 tt_vlan_len
, tt_num_entries
;
3608 if (tvlv_value_len
< sizeof(*tt_data
))
3609 return NET_RX_SUCCESS
;
3611 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3612 tvlv_value_len
-= sizeof(*tt_data
);
3614 tt_vlan_len
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3615 tt_vlan_len
*= ntohs(tt_data
->num_vlan
);
3617 if (tvlv_value_len
< tt_vlan_len
)
3618 return NET_RX_SUCCESS
;
3620 tvlv_value_len
-= tt_vlan_len
;
3621 tt_num_entries
= batadv_tt_entries(tvlv_value_len
);
3623 switch (tt_data
->flags
& BATADV_TT_DATA_TYPE_MASK
) {
3624 case BATADV_TT_REQUEST
:
3625 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
3627 /* If this node cannot provide a TT response the tt_request is
3630 ret
= batadv_send_tt_response(bat_priv
, tt_data
, src
, dst
);
3632 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3637 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3638 "Routing TT_REQUEST to %pM [%c]\n",
3640 /* tvlv API will re-route the packet */
3644 case BATADV_TT_RESPONSE
:
3645 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
3647 if (batadv_is_my_mac(bat_priv
, dst
)) {
3648 batadv_handle_tt_response(bat_priv
, tt_data
,
3649 src
, tt_num_entries
);
3650 return NET_RX_SUCCESS
;
3653 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3658 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3659 "Routing TT_RESPONSE to %pM [%c]\n", dst
, tt_flag
);
3661 /* tvlv API will re-route the packet */
3665 return NET_RX_SUCCESS
;
3669 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3670 * @bat_priv: the bat priv with all the soft interface information
3671 * @src: mac address of tt tvlv sender
3672 * @dst: mac address of tt tvlv recipient
3673 * @tvlv_value: tvlv buffer containing the tt data
3674 * @tvlv_value_len: tvlv buffer length
3676 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3679 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3684 struct batadv_tvlv_roam_adv
*roaming_adv
;
3685 struct batadv_orig_node
*orig_node
= NULL
;
3687 /* If this node is not the intended recipient of the
3688 * roaming advertisement the packet is forwarded
3689 * (the tvlv API will re-route the packet).
3691 if (!batadv_is_my_mac(bat_priv
, dst
))
3694 if (tvlv_value_len
< sizeof(*roaming_adv
))
3697 orig_node
= batadv_orig_hash_find(bat_priv
, src
);
3701 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
3702 roaming_adv
= (struct batadv_tvlv_roam_adv
*)tvlv_value
;
3704 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3705 "Received ROAMING_ADV from %pM (client %pM)\n",
3706 src
, roaming_adv
->client
);
3708 batadv_tt_global_add(bat_priv
, orig_node
, roaming_adv
->client
,
3709 ntohs(roaming_adv
->vid
), BATADV_TT_CLIENT_ROAM
,
3710 atomic_read(&orig_node
->last_ttvn
) + 1);
3714 batadv_orig_node_free_ref(orig_node
);
3715 return NET_RX_SUCCESS
;
3719 * batadv_tt_init - initialise the translation table internals
3720 * @bat_priv: the bat priv with all the soft interface information
3722 * Return 0 on success or negative error number in case of failure.
3724 int batadv_tt_init(struct batadv_priv
*bat_priv
)
3728 /* synchronized flags must be remote */
3729 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK
& BATADV_TT_REMOTE_MASK
));
3731 ret
= batadv_tt_local_init(bat_priv
);
3735 ret
= batadv_tt_global_init(bat_priv
);
3739 batadv_tvlv_handler_register(bat_priv
, batadv_tt_tvlv_ogm_handler_v1
,
3740 batadv_tt_tvlv_unicast_handler_v1
,
3741 BATADV_TVLV_TT
, 1, BATADV_NO_FLAGS
);
3743 batadv_tvlv_handler_register(bat_priv
, NULL
,
3744 batadv_roam_tvlv_unicast_handler_v1
,
3745 BATADV_TVLV_ROAM
, 1, BATADV_NO_FLAGS
);
3747 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
3748 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3749 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3755 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3756 * @bat_priv: the bat priv with all the soft interface information
3757 * @addr: the mac address of the client
3758 * @vid: the identifier of the VLAN where this client is connected
3760 * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3763 bool batadv_tt_global_is_isolated(struct batadv_priv
*bat_priv
,
3764 const u8
*addr
, unsigned short vid
)
3766 struct batadv_tt_global_entry
*tt
;
3769 tt
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3773 ret
= tt
->common
.flags
& BATADV_TT_CLIENT_ISOLA
;
3775 batadv_tt_global_entry_free_ref(tt
);