1 /* Copyright (C) 2007-2016 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/kref.h>
35 #include <linux/list.h>
36 #include <linux/lockdep.h>
37 #include <linux/netdevice.h>
38 #include <linux/rculist.h>
39 #include <linux/rcupdate.h>
40 #include <linux/seq_file.h>
41 #include <linux/slab.h>
42 #include <linux/spinlock.h>
43 #include <linux/stddef.h>
44 #include <linux/string.h>
45 #include <linux/workqueue.h>
46 #include <net/net_namespace.h>
48 #include "bridge_loop_avoidance.h"
49 #include "hard-interface.h"
51 #include "multicast.h"
52 #include "originator.h"
54 #include "soft-interface.h"
57 static struct lock_class_key batadv_tt_local_hash_lock_class_key
;
58 static struct lock_class_key batadv_tt_global_hash_lock_class_key
;
60 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, u8
*client
,
62 struct batadv_orig_node
*orig_node
);
63 static void batadv_tt_purge(struct work_struct
*work
);
65 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
);
66 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
67 struct batadv_orig_node
*orig_node
,
68 const unsigned char *addr
,
69 unsigned short vid
, const char *message
,
73 * batadv_compare_tt - check if two TT entries are the same
74 * @node: the list element pointer of the first TT entry
75 * @data2: pointer to the tt_common_entry of the second TT entry
77 * Compare the MAC address and the VLAN ID of the two TT entries and check if
78 * they are the same TT client.
79 * Return: 1 if the two TT clients are the same, 0 otherwise
81 static int batadv_compare_tt(const struct hlist_node
*node
, const void *data2
)
83 const void *data1
= container_of(node
, struct batadv_tt_common_entry
,
85 const struct batadv_tt_common_entry
*tt1
= data1
;
86 const struct batadv_tt_common_entry
*tt2
= data2
;
88 return (tt1
->vid
== tt2
->vid
) && batadv_compare_eth(data1
, data2
);
92 * batadv_choose_tt - return the index of the tt entry in the hash table
93 * @data: pointer to the tt_common_entry object to map
94 * @size: the size of the hash table
96 * Return: the hash index where the object represented by 'data' should be
99 static inline u32
batadv_choose_tt(const void *data
, u32 size
)
101 struct batadv_tt_common_entry
*tt
;
104 tt
= (struct batadv_tt_common_entry
*)data
;
105 hash
= jhash(&tt
->addr
, ETH_ALEN
, hash
);
106 hash
= jhash(&tt
->vid
, sizeof(tt
->vid
), hash
);
112 * batadv_tt_hash_find - look for a client in the given hash table
113 * @hash: the hash table to search
114 * @addr: the mac address of the client to look for
115 * @vid: VLAN identifier
117 * Return: a pointer to the tt_common struct belonging to the searched client if
118 * found, NULL otherwise.
120 static struct batadv_tt_common_entry
*
121 batadv_tt_hash_find(struct batadv_hashtable
*hash
, const u8
*addr
,
124 struct hlist_head
*head
;
125 struct batadv_tt_common_entry to_search
, *tt
, *tt_tmp
= NULL
;
131 ether_addr_copy(to_search
.addr
, addr
);
134 index
= batadv_choose_tt(&to_search
, hash
->size
);
135 head
= &hash
->table
[index
];
138 hlist_for_each_entry_rcu(tt
, head
, hash_entry
) {
139 if (!batadv_compare_eth(tt
, addr
))
145 if (!kref_get_unless_zero(&tt
->refcount
))
157 * batadv_tt_local_hash_find - search the local table for a given client
158 * @bat_priv: the bat priv with all the soft interface information
159 * @addr: the mac address of the client to look for
160 * @vid: VLAN identifier
162 * Return: a pointer to the corresponding tt_local_entry struct if the client is
163 * found, NULL otherwise.
165 static struct batadv_tt_local_entry
*
166 batadv_tt_local_hash_find(struct batadv_priv
*bat_priv
, const u8
*addr
,
169 struct batadv_tt_common_entry
*tt_common_entry
;
170 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
172 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.local_hash
, addr
,
175 tt_local_entry
= container_of(tt_common_entry
,
176 struct batadv_tt_local_entry
,
178 return tt_local_entry
;
182 * batadv_tt_global_hash_find - search the global table for a given client
183 * @bat_priv: the bat priv with all the soft interface information
184 * @addr: the mac address of the client to look for
185 * @vid: VLAN identifier
187 * Return: a pointer to the corresponding tt_global_entry struct if the client
188 * is found, NULL otherwise.
190 static struct batadv_tt_global_entry
*
191 batadv_tt_global_hash_find(struct batadv_priv
*bat_priv
, const u8
*addr
,
194 struct batadv_tt_common_entry
*tt_common_entry
;
195 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
197 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.global_hash
, addr
,
200 tt_global_entry
= container_of(tt_common_entry
,
201 struct batadv_tt_global_entry
,
203 return tt_global_entry
;
207 * batadv_tt_local_entry_release - release tt_local_entry from lists and queue
208 * for free after rcu grace period
209 * @ref: kref pointer of the nc_node
211 static void batadv_tt_local_entry_release(struct kref
*ref
)
213 struct batadv_tt_local_entry
*tt_local_entry
;
215 tt_local_entry
= container_of(ref
, struct batadv_tt_local_entry
,
218 kfree_rcu(tt_local_entry
, common
.rcu
);
222 * batadv_tt_local_entry_free_ref - decrement the tt_local_entry refcounter and
223 * possibly release it
224 * @tt_local_entry: tt_local_entry to be free'd
227 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry
*tt_local_entry
)
229 kref_put(&tt_local_entry
->common
.refcount
,
230 batadv_tt_local_entry_release
);
234 * batadv_tt_global_entry_release - release tt_global_entry from lists and queue
235 * for free after rcu grace period
236 * @ref: kref pointer of the nc_node
238 static void batadv_tt_global_entry_release(struct kref
*ref
)
240 struct batadv_tt_global_entry
*tt_global_entry
;
242 tt_global_entry
= container_of(ref
, struct batadv_tt_global_entry
,
245 batadv_tt_global_del_orig_list(tt_global_entry
);
246 kfree_rcu(tt_global_entry
, common
.rcu
);
250 * batadv_tt_global_entry_free_ref - decrement the tt_global_entry refcounter
251 * and possibly release it
252 * @tt_global_entry: tt_global_entry to be free'd
255 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry
*tt_global_entry
)
257 kref_put(&tt_global_entry
->common
.refcount
,
258 batadv_tt_global_entry_release
);
262 * batadv_tt_global_hash_count - count the number of orig entries
263 * @bat_priv: the bat priv with all the soft interface information
264 * @addr: the mac address of the client to count entries for
265 * @vid: VLAN identifier
267 * Return: the number of originators advertising the given address/data
268 * (excluding ourself).
270 int batadv_tt_global_hash_count(struct batadv_priv
*bat_priv
,
271 const u8
*addr
, unsigned short vid
)
273 struct batadv_tt_global_entry
*tt_global_entry
;
276 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
277 if (!tt_global_entry
)
280 count
= atomic_read(&tt_global_entry
->orig_list_count
);
281 batadv_tt_global_entry_free_ref(tt_global_entry
);
287 * batadv_tt_local_size_mod - change the size by v of the local table identified
289 * @bat_priv: the bat priv with all the soft interface information
290 * @vid: the VLAN identifier of the sub-table to change
291 * @v: the amount to sum to the local table size
293 static void batadv_tt_local_size_mod(struct batadv_priv
*bat_priv
,
294 unsigned short vid
, int v
)
296 struct batadv_softif_vlan
*vlan
;
298 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
302 atomic_add(v
, &vlan
->tt
.num_entries
);
304 batadv_softif_vlan_free_ref(vlan
);
308 * batadv_tt_local_size_inc - increase by one the local table size for the given
310 * @bat_priv: the bat priv with all the soft interface information
311 * @vid: the VLAN identifier
313 static void batadv_tt_local_size_inc(struct batadv_priv
*bat_priv
,
316 batadv_tt_local_size_mod(bat_priv
, vid
, 1);
320 * batadv_tt_local_size_dec - decrease by one the local table size for the given
322 * @bat_priv: the bat priv with all the soft interface information
323 * @vid: the VLAN identifier
325 static void batadv_tt_local_size_dec(struct batadv_priv
*bat_priv
,
328 batadv_tt_local_size_mod(bat_priv
, vid
, -1);
332 * batadv_tt_global_size_mod - change the size by v of the global table
333 * for orig_node identified by vid
334 * @orig_node: the originator for which the table has to be modified
335 * @vid: the VLAN identifier
336 * @v: the amount to sum to the global table size
338 static void batadv_tt_global_size_mod(struct batadv_orig_node
*orig_node
,
339 unsigned short vid
, int v
)
341 struct batadv_orig_node_vlan
*vlan
;
343 vlan
= batadv_orig_node_vlan_new(orig_node
, vid
);
347 if (atomic_add_return(v
, &vlan
->tt
.num_entries
) == 0) {
348 spin_lock_bh(&orig_node
->vlan_list_lock
);
349 hlist_del_init_rcu(&vlan
->list
);
350 spin_unlock_bh(&orig_node
->vlan_list_lock
);
351 batadv_orig_node_vlan_free_ref(vlan
);
354 batadv_orig_node_vlan_free_ref(vlan
);
358 * batadv_tt_global_size_inc - increase by one the global table size for the
360 * @orig_node: the originator which global table size has to be decreased
361 * @vid: the vlan identifier
363 static void batadv_tt_global_size_inc(struct batadv_orig_node
*orig_node
,
366 batadv_tt_global_size_mod(orig_node
, vid
, 1);
370 * batadv_tt_global_size_dec - decrease by one the global table size for the
372 * @orig_node: the originator which global table size has to be decreased
373 * @vid: the vlan identifier
375 static void batadv_tt_global_size_dec(struct batadv_orig_node
*orig_node
,
378 batadv_tt_global_size_mod(orig_node
, vid
, -1);
382 * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
383 * queue for free after rcu grace period
384 * @ref: kref pointer of the tt orig entry
386 static void batadv_tt_orig_list_entry_release(struct kref
*ref
)
388 struct batadv_tt_orig_list_entry
*orig_entry
;
390 orig_entry
= container_of(ref
, struct batadv_tt_orig_list_entry
,
393 batadv_orig_node_free_ref(orig_entry
->orig_node
);
394 kfree_rcu(orig_entry
, rcu
);
398 * batadv_tt_orig_list_entry_free_ref - decrement the tt orig entry refcounter
399 * and possibly release it
400 * @orig_entry: tt orig entry to be free'd
403 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry
*orig_entry
)
405 kref_put(&orig_entry
->refcount
, batadv_tt_orig_list_entry_release
);
409 * batadv_tt_local_event - store a local TT event (ADD/DEL)
410 * @bat_priv: the bat priv with all the soft interface information
411 * @tt_local_entry: the TT entry involved in the event
412 * @event_flags: flags to store in the event structure
414 static void batadv_tt_local_event(struct batadv_priv
*bat_priv
,
415 struct batadv_tt_local_entry
*tt_local_entry
,
418 struct batadv_tt_change_node
*tt_change_node
, *entry
, *safe
;
419 struct batadv_tt_common_entry
*common
= &tt_local_entry
->common
;
420 u8 flags
= common
->flags
| event_flags
;
421 bool event_removed
= false;
422 bool del_op_requested
, del_op_entry
;
424 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
428 tt_change_node
->change
.flags
= flags
;
429 memset(tt_change_node
->change
.reserved
, 0,
430 sizeof(tt_change_node
->change
.reserved
));
431 ether_addr_copy(tt_change_node
->change
.addr
, common
->addr
);
432 tt_change_node
->change
.vid
= htons(common
->vid
);
434 del_op_requested
= flags
& BATADV_TT_CLIENT_DEL
;
436 /* check for ADD+DEL or DEL+ADD events */
437 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
438 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
440 if (!batadv_compare_eth(entry
->change
.addr
, common
->addr
))
443 /* DEL+ADD in the same orig interval have no effect and can be
444 * removed to avoid silly behaviour on the receiver side. The
445 * other way around (ADD+DEL) can happen in case of roaming of
446 * a client still in the NEW state. Roaming of NEW clients is
447 * now possible due to automatically recognition of "temporary"
450 del_op_entry
= entry
->change
.flags
& BATADV_TT_CLIENT_DEL
;
451 if (!del_op_requested
&& del_op_entry
)
453 if (del_op_requested
&& !del_op_entry
)
456 /* this is a second add in the same originator interval. It
457 * means that flags have been changed: update them!
459 if (!del_op_requested
&& !del_op_entry
)
460 entry
->change
.flags
= flags
;
464 list_del(&entry
->list
);
466 kfree(tt_change_node
);
467 event_removed
= true;
471 /* track the change in the OGMinterval list */
472 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
475 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
478 atomic_dec(&bat_priv
->tt
.local_changes
);
480 atomic_inc(&bat_priv
->tt
.local_changes
);
484 * batadv_tt_len - compute length in bytes of given number of tt changes
485 * @changes_num: number of tt changes
487 * Return: computed length in bytes.
489 static int batadv_tt_len(int changes_num
)
491 return changes_num
* sizeof(struct batadv_tvlv_tt_change
);
495 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
496 * @tt_len: available space
498 * Return: the number of entries.
500 static u16
batadv_tt_entries(u16 tt_len
)
502 return tt_len
/ batadv_tt_len(1);
506 * batadv_tt_local_table_transmit_size - calculates the local translation table
507 * size when transmitted over the air
508 * @bat_priv: the bat priv with all the soft interface information
510 * Return: local translation table size in bytes.
512 static int batadv_tt_local_table_transmit_size(struct batadv_priv
*bat_priv
)
515 u16 tt_local_entries
= 0;
516 struct batadv_softif_vlan
*vlan
;
520 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
522 tt_local_entries
+= atomic_read(&vlan
->tt
.num_entries
);
526 /* header size of tvlv encapsulated tt response payload */
527 hdr_size
= sizeof(struct batadv_unicast_tvlv_packet
);
528 hdr_size
+= sizeof(struct batadv_tvlv_hdr
);
529 hdr_size
+= sizeof(struct batadv_tvlv_tt_data
);
530 hdr_size
+= num_vlan
* sizeof(struct batadv_tvlv_tt_vlan_data
);
532 return hdr_size
+ batadv_tt_len(tt_local_entries
);
535 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
537 if (bat_priv
->tt
.local_hash
)
540 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
542 if (!bat_priv
->tt
.local_hash
)
545 batadv_hash_set_lock_class(bat_priv
->tt
.local_hash
,
546 &batadv_tt_local_hash_lock_class_key
);
551 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
552 struct batadv_tt_global_entry
*tt_global
,
555 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
556 "Deleting global tt entry %pM (vid: %d): %s\n",
557 tt_global
->common
.addr
,
558 BATADV_PRINT_VID(tt_global
->common
.vid
), message
);
560 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
561 batadv_choose_tt
, &tt_global
->common
);
562 batadv_tt_global_entry_free_ref(tt_global
);
566 * batadv_tt_local_add - add a new client to the local table or update an
568 * @soft_iface: netdev struct of the mesh interface
569 * @addr: the mac address of the client to add
570 * @vid: VLAN identifier
571 * @ifindex: index of the interface where the client is connected to (useful to
572 * identify wireless clients)
573 * @mark: the value contained in the skb->mark field of the received packet (if
576 * Return: true if the client was successfully added, false otherwise.
578 bool batadv_tt_local_add(struct net_device
*soft_iface
, const u8
*addr
,
579 unsigned short vid
, int ifindex
, u32 mark
)
581 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
582 struct batadv_tt_local_entry
*tt_local
;
583 struct batadv_tt_global_entry
*tt_global
= NULL
;
584 struct batadv_softif_vlan
*vlan
;
585 struct net_device
*in_dev
= NULL
;
586 struct hlist_head
*head
;
587 struct batadv_tt_orig_list_entry
*orig_entry
;
588 int hash_added
, table_size
, packet_size_max
;
590 bool roamed_back
= false;
594 if (ifindex
!= BATADV_NULL_IFINDEX
)
595 in_dev
= dev_get_by_index(&init_net
, ifindex
);
597 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
599 if (!is_multicast_ether_addr(addr
))
600 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
603 tt_local
->last_seen
= jiffies
;
604 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
605 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
606 "Re-adding pending client %pM (vid: %d)\n",
607 addr
, BATADV_PRINT_VID(vid
));
608 /* whatever the reason why the PENDING flag was set,
609 * this is a client which was enqueued to be removed in
610 * this orig_interval. Since it popped up again, the
611 * flag can be reset like it was never enqueued
613 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
617 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
618 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
619 "Roaming client %pM (vid: %d) came back to its original location\n",
620 addr
, BATADV_PRINT_VID(vid
));
621 /* the ROAM flag is set because this client roamed away
622 * and the node got a roaming_advertisement message. Now
623 * that the client popped up again at its original
624 * location such flag can be unset
626 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
632 /* Ignore the client if we cannot send it in a full table response. */
633 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
634 table_size
+= batadv_tt_len(1);
635 packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
636 if (table_size
> packet_size_max
) {
637 net_ratelimited_function(batadv_info
, soft_iface
,
638 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
639 table_size
, packet_size_max
, addr
);
643 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
647 /* increase the refcounter of the related vlan */
648 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
649 if (WARN(!vlan
, "adding TT local entry %pM to non-existent VLAN %d",
650 addr
, BATADV_PRINT_VID(vid
))) {
656 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
657 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
658 addr
, BATADV_PRINT_VID(vid
),
659 (u8
)atomic_read(&bat_priv
->tt
.vn
));
661 ether_addr_copy(tt_local
->common
.addr
, addr
);
662 /* The local entry has to be marked as NEW to avoid to send it in
663 * a full table response going out before the next ttvn increment
664 * (consistency check)
666 tt_local
->common
.flags
= BATADV_TT_CLIENT_NEW
;
667 tt_local
->common
.vid
= vid
;
668 if (batadv_is_wifi_netdev(in_dev
))
669 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
670 kref_init(&tt_local
->common
.refcount
);
671 kref_get(&tt_local
->common
.refcount
);
672 tt_local
->last_seen
= jiffies
;
673 tt_local
->common
.added_at
= tt_local
->last_seen
;
675 /* the batman interface mac and multicast addresses should never be
678 if (batadv_compare_eth(addr
, soft_iface
->dev_addr
) ||
679 is_multicast_ether_addr(addr
))
680 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NOPURGE
;
682 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
683 batadv_choose_tt
, &tt_local
->common
,
684 &tt_local
->common
.hash_entry
);
686 if (unlikely(hash_added
!= 0)) {
687 /* remove the reference for the hash */
688 batadv_tt_local_entry_free_ref(tt_local
);
689 batadv_softif_vlan_free_ref(vlan
);
694 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
697 /* Check whether it is a roaming, but don't do anything if the roaming
698 * process has already been handled
700 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
701 /* These node are probably going to update their tt table */
702 head
= &tt_global
->orig_list
;
704 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
705 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
706 tt_global
->common
.vid
,
707 orig_entry
->orig_node
);
711 batadv_tt_global_free(bat_priv
, tt_global
,
715 /* The global entry has to be marked as ROAMING and
716 * has to be kept for consistency purpose
718 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
719 tt_global
->roam_at
= jiffies
;
723 /* store the current remote flags before altering them. This helps
724 * understanding is flags are changing or not
726 remote_flags
= tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
;
728 if (batadv_is_wifi_netdev(in_dev
))
729 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
731 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_WIFI
;
733 /* check the mark in the skb: if it's equal to the configured
734 * isolation_mark, it means the packet is coming from an isolated
737 match_mark
= (mark
& bat_priv
->isolation_mark_mask
);
738 if (bat_priv
->isolation_mark_mask
&&
739 match_mark
== bat_priv
->isolation_mark
)
740 tt_local
->common
.flags
|= BATADV_TT_CLIENT_ISOLA
;
742 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ISOLA
;
744 /* if any "dynamic" flag has been modified, resend an ADD event for this
745 * entry so that all the nodes can get the new flags
747 if (remote_flags
^ (tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
))
748 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
755 batadv_tt_local_entry_free_ref(tt_local
);
757 batadv_tt_global_entry_free_ref(tt_global
);
762 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
763 * within a TT Response directed to another node
764 * @orig_node: originator for which the TT data has to be prepared
765 * @tt_data: uninitialised pointer to the address of the TVLV buffer
766 * @tt_change: uninitialised pointer to the address of the area where the TT
767 * changed can be stored
768 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
769 * function reserves the amount of space needed to send the entire global TT
770 * table. In case of success the value is updated with the real amount of
772 * Allocate the needed amount of memory for the entire TT TVLV and write its
773 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
774 * objects, one per active VLAN served by the originator node.
776 * Return: the size of the allocated buffer or 0 in case of failure.
779 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node
*orig_node
,
780 struct batadv_tvlv_tt_data
**tt_data
,
781 struct batadv_tvlv_tt_change
**tt_change
,
788 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
789 struct batadv_orig_node_vlan
*vlan
;
793 hlist_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
795 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
798 change_offset
= sizeof(**tt_data
);
799 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
801 /* if tt_len is negative, allocate the space needed by the full table */
803 *tt_len
= batadv_tt_len(num_entries
);
806 tvlv_len
+= change_offset
;
808 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
814 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
815 (*tt_data
)->ttvn
= atomic_read(&orig_node
->last_ttvn
);
816 (*tt_data
)->num_vlan
= htons(num_vlan
);
818 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
819 hlist_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
820 tt_vlan
->vid
= htons(vlan
->vid
);
821 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
826 tt_change_ptr
= (u8
*)*tt_data
+ change_offset
;
827 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
835 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
837 * @bat_priv: the bat priv with all the soft interface information
838 * @tt_data: uninitialised pointer to the address of the TVLV buffer
839 * @tt_change: uninitialised pointer to the address of the area where the TT
840 * changes can be stored
841 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
842 * function reserves the amount of space needed to send the entire local TT
843 * table. In case of success the value is updated with the real amount of
846 * Allocate the needed amount of memory for the entire TT TVLV and write its
847 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
848 * objects, one per active VLAN.
850 * Return: the size of the allocated buffer or 0 in case of failure.
853 batadv_tt_prepare_tvlv_local_data(struct batadv_priv
*bat_priv
,
854 struct batadv_tvlv_tt_data
**tt_data
,
855 struct batadv_tvlv_tt_change
**tt_change
,
858 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
859 struct batadv_softif_vlan
*vlan
;
867 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
869 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
872 change_offset
= sizeof(**tt_data
);
873 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
875 /* if tt_len is negative, allocate the space needed by the full table */
877 *tt_len
= batadv_tt_len(num_entries
);
880 tvlv_len
+= change_offset
;
882 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
888 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
889 (*tt_data
)->ttvn
= atomic_read(&bat_priv
->tt
.vn
);
890 (*tt_data
)->num_vlan
= htons(num_vlan
);
892 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
893 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
894 tt_vlan
->vid
= htons(vlan
->vid
);
895 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
900 tt_change_ptr
= (u8
*)*tt_data
+ change_offset
;
901 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
909 * batadv_tt_tvlv_container_update - update the translation table tvlv container
910 * after local tt changes have been committed
911 * @bat_priv: the bat priv with all the soft interface information
913 static void batadv_tt_tvlv_container_update(struct batadv_priv
*bat_priv
)
915 struct batadv_tt_change_node
*entry
, *safe
;
916 struct batadv_tvlv_tt_data
*tt_data
;
917 struct batadv_tvlv_tt_change
*tt_change
;
918 int tt_diff_len
, tt_change_len
= 0;
919 int tt_diff_entries_num
= 0;
920 int tt_diff_entries_count
= 0;
923 tt_diff_entries_num
= atomic_read(&bat_priv
->tt
.local_changes
);
924 tt_diff_len
= batadv_tt_len(tt_diff_entries_num
);
926 /* if we have too many changes for one packet don't send any
927 * and wait for the tt table request which will be fragmented
929 if (tt_diff_len
> bat_priv
->soft_iface
->mtu
)
932 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
, &tt_data
,
933 &tt_change
, &tt_diff_len
);
937 tt_data
->flags
= BATADV_TT_OGM_DIFF
;
939 if (tt_diff_len
== 0)
940 goto container_register
;
942 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
943 atomic_set(&bat_priv
->tt
.local_changes
, 0);
945 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
947 if (tt_diff_entries_count
< tt_diff_entries_num
) {
948 memcpy(tt_change
+ tt_diff_entries_count
,
950 sizeof(struct batadv_tvlv_tt_change
));
951 tt_diff_entries_count
++;
953 list_del(&entry
->list
);
956 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
958 /* Keep the buffer for possible tt_request */
959 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
960 kfree(bat_priv
->tt
.last_changeset
);
961 bat_priv
->tt
.last_changeset_len
= 0;
962 bat_priv
->tt
.last_changeset
= NULL
;
963 tt_change_len
= batadv_tt_len(tt_diff_entries_count
);
964 /* check whether this new OGM has no changes due to size problems */
965 if (tt_diff_entries_count
> 0) {
966 /* if kmalloc() fails we will reply with the full table
967 * instead of providing the diff
969 bat_priv
->tt
.last_changeset
= kzalloc(tt_diff_len
, GFP_ATOMIC
);
970 if (bat_priv
->tt
.last_changeset
) {
971 memcpy(bat_priv
->tt
.last_changeset
,
972 tt_change
, tt_change_len
);
973 bat_priv
->tt
.last_changeset_len
= tt_diff_len
;
976 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
979 batadv_tvlv_container_register(bat_priv
, BATADV_TVLV_TT
, 1, tt_data
,
984 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
986 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
987 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
988 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
989 struct batadv_tt_common_entry
*tt_common_entry
;
990 struct batadv_tt_local_entry
*tt_local
;
991 struct batadv_hard_iface
*primary_if
;
992 struct batadv_softif_vlan
*vlan
;
993 struct hlist_head
*head
;
998 unsigned long last_seen_jiffies
;
1000 u16 np_flag
= BATADV_TT_CLIENT_NOPURGE
;
1002 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1007 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
1008 net_dev
->name
, (u8
)atomic_read(&bat_priv
->tt
.vn
));
1009 seq_printf(seq
, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
1010 "Flags", "Last seen", "CRC");
1012 for (i
= 0; i
< hash
->size
; i
++) {
1013 head
= &hash
->table
[i
];
1016 hlist_for_each_entry_rcu(tt_common_entry
,
1018 tt_local
= container_of(tt_common_entry
,
1019 struct batadv_tt_local_entry
,
1021 vid
= tt_common_entry
->vid
;
1022 last_seen_jiffies
= jiffies
- tt_local
->last_seen
;
1023 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
1024 last_seen_secs
= last_seen_msecs
/ 1000;
1025 last_seen_msecs
= last_seen_msecs
% 1000;
1027 no_purge
= tt_common_entry
->flags
& np_flag
;
1029 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1031 seq_printf(seq
, "Cannot retrieve VLAN %d\n",
1032 BATADV_PRINT_VID(vid
));
1037 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
1038 tt_common_entry
->addr
,
1039 BATADV_PRINT_VID(tt_common_entry
->vid
),
1040 ((tt_common_entry
->flags
&
1041 BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
1042 no_purge
? 'P' : '.',
1043 ((tt_common_entry
->flags
&
1044 BATADV_TT_CLIENT_NEW
) ? 'N' : '.'),
1045 ((tt_common_entry
->flags
&
1046 BATADV_TT_CLIENT_PENDING
) ? 'X' : '.'),
1047 ((tt_common_entry
->flags
&
1048 BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
1049 ((tt_common_entry
->flags
&
1050 BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
1051 no_purge
? 0 : last_seen_secs
,
1052 no_purge
? 0 : last_seen_msecs
,
1055 batadv_softif_vlan_free_ref(vlan
);
1061 batadv_hardif_free_ref(primary_if
);
1066 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
1067 struct batadv_tt_local_entry
*tt_local_entry
,
1068 u16 flags
, const char *message
)
1070 batadv_tt_local_event(bat_priv
, tt_local_entry
, flags
);
1072 /* The local client has to be marked as "pending to be removed" but has
1073 * to be kept in the table in order to send it in a full table
1074 * response issued before the net ttvn increment (consistency check)
1076 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
1078 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1079 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1080 tt_local_entry
->common
.addr
,
1081 BATADV_PRINT_VID(tt_local_entry
->common
.vid
), message
);
1085 * batadv_tt_local_remove - logically remove an entry from the local table
1086 * @bat_priv: the bat priv with all the soft interface information
1087 * @addr: the MAC address of the client to remove
1088 * @vid: VLAN identifier
1089 * @message: message to append to the log on deletion
1090 * @roaming: true if the deletion is due to a roaming event
1092 * Return: the flags assigned to the local entry before being deleted
1094 u16
batadv_tt_local_remove(struct batadv_priv
*bat_priv
, const u8
*addr
,
1095 unsigned short vid
, const char *message
,
1098 struct batadv_tt_local_entry
*tt_local_entry
;
1099 u16 flags
, curr_flags
= BATADV_NO_FLAGS
;
1100 struct batadv_softif_vlan
*vlan
;
1101 void *tt_entry_exists
;
1103 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
1104 if (!tt_local_entry
)
1107 curr_flags
= tt_local_entry
->common
.flags
;
1109 flags
= BATADV_TT_CLIENT_DEL
;
1110 /* if this global entry addition is due to a roaming, the node has to
1111 * mark the local entry as "roamed" in order to correctly reroute
1115 flags
|= BATADV_TT_CLIENT_ROAM
;
1116 /* mark the local client as ROAMed */
1117 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1120 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
1121 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
1125 /* if this client has been added right now, it is possible to
1126 * immediately purge it
1128 batadv_tt_local_event(bat_priv
, tt_local_entry
, BATADV_TT_CLIENT_DEL
);
1130 tt_entry_exists
= batadv_hash_remove(bat_priv
->tt
.local_hash
,
1133 &tt_local_entry
->common
);
1134 if (!tt_entry_exists
)
1137 /* extra call to free the local tt entry */
1138 batadv_tt_local_entry_free_ref(tt_local_entry
);
1140 /* decrease the reference held for this vlan */
1141 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1145 batadv_softif_vlan_free_ref(vlan
);
1146 batadv_softif_vlan_free_ref(vlan
);
1150 batadv_tt_local_entry_free_ref(tt_local_entry
);
1156 * batadv_tt_local_purge_list - purge inactive tt local entries
1157 * @bat_priv: the bat priv with all the soft interface information
1158 * @head: pointer to the list containing the local tt entries
1159 * @timeout: parameter deciding whether a given tt local entry is considered
1162 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
1163 struct hlist_head
*head
,
1166 struct batadv_tt_local_entry
*tt_local_entry
;
1167 struct batadv_tt_common_entry
*tt_common_entry
;
1168 struct hlist_node
*node_tmp
;
1170 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
, head
,
1172 tt_local_entry
= container_of(tt_common_entry
,
1173 struct batadv_tt_local_entry
,
1175 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
1178 /* entry already marked for deletion */
1179 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
1182 if (!batadv_has_timed_out(tt_local_entry
->last_seen
, timeout
))
1185 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
1186 BATADV_TT_CLIENT_DEL
, "timed out");
1191 * batadv_tt_local_purge - purge inactive tt local entries
1192 * @bat_priv: the bat priv with all the soft interface information
1193 * @timeout: parameter deciding whether a given tt local entry is considered
1196 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
,
1199 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1200 struct hlist_head
*head
;
1201 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1204 for (i
= 0; i
< hash
->size
; i
++) {
1205 head
= &hash
->table
[i
];
1206 list_lock
= &hash
->list_locks
[i
];
1208 spin_lock_bh(list_lock
);
1209 batadv_tt_local_purge_list(bat_priv
, head
, timeout
);
1210 spin_unlock_bh(list_lock
);
1214 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
1216 struct batadv_hashtable
*hash
;
1217 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1218 struct batadv_tt_common_entry
*tt_common_entry
;
1219 struct batadv_tt_local_entry
*tt_local
;
1220 struct batadv_softif_vlan
*vlan
;
1221 struct hlist_node
*node_tmp
;
1222 struct hlist_head
*head
;
1225 if (!bat_priv
->tt
.local_hash
)
1228 hash
= bat_priv
->tt
.local_hash
;
1230 for (i
= 0; i
< hash
->size
; i
++) {
1231 head
= &hash
->table
[i
];
1232 list_lock
= &hash
->list_locks
[i
];
1234 spin_lock_bh(list_lock
);
1235 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1237 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1238 tt_local
= container_of(tt_common_entry
,
1239 struct batadv_tt_local_entry
,
1242 /* decrease the reference held for this vlan */
1243 vlan
= batadv_softif_vlan_get(bat_priv
,
1244 tt_common_entry
->vid
);
1246 batadv_softif_vlan_free_ref(vlan
);
1247 batadv_softif_vlan_free_ref(vlan
);
1250 batadv_tt_local_entry_free_ref(tt_local
);
1252 spin_unlock_bh(list_lock
);
1255 batadv_hash_destroy(hash
);
1257 bat_priv
->tt
.local_hash
= NULL
;
1260 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
1262 if (bat_priv
->tt
.global_hash
)
1265 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
1267 if (!bat_priv
->tt
.global_hash
)
1270 batadv_hash_set_lock_class(bat_priv
->tt
.global_hash
,
1271 &batadv_tt_global_hash_lock_class_key
);
1276 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
1278 struct batadv_tt_change_node
*entry
, *safe
;
1280 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
1282 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
1284 list_del(&entry
->list
);
1288 atomic_set(&bat_priv
->tt
.local_changes
, 0);
1289 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
1293 * batadv_tt_global_orig_entry_find - find a TT orig_list_entry
1294 * @entry: the TT global entry where the orig_list_entry has to be
1296 * @orig_node: the originator for which the orig_list_entry has to be found
1298 * retrieve the orig_tt_list_entry belonging to orig_node from the
1299 * batadv_tt_global_entry list
1301 * Return: it with an increased refcounter, NULL if not found
1303 static struct batadv_tt_orig_list_entry
*
1304 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
1305 const struct batadv_orig_node
*orig_node
)
1307 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
1308 const struct hlist_head
*head
;
1311 head
= &entry
->orig_list
;
1312 hlist_for_each_entry_rcu(tmp_orig_entry
, head
, list
) {
1313 if (tmp_orig_entry
->orig_node
!= orig_node
)
1315 if (!kref_get_unless_zero(&tmp_orig_entry
->refcount
))
1318 orig_entry
= tmp_orig_entry
;
1327 * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
1328 * by a given originator
1329 * @entry: the TT global entry to check
1330 * @orig_node: the originator to search in the list
1332 * find out if an orig_node is already in the list of a tt_global_entry.
1334 * Return: true if found, false otherwise
1337 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
1338 const struct batadv_orig_node
*orig_node
)
1340 struct batadv_tt_orig_list_entry
*orig_entry
;
1343 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
1346 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1353 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
1354 struct batadv_orig_node
*orig_node
, int ttvn
)
1356 struct batadv_tt_orig_list_entry
*orig_entry
;
1358 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
1360 /* refresh the ttvn: the current value could be a bogus one that
1361 * was added during a "temporary client detection"
1363 orig_entry
->ttvn
= ttvn
;
1367 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
1371 INIT_HLIST_NODE(&orig_entry
->list
);
1372 kref_get(&orig_node
->refcount
);
1373 batadv_tt_global_size_inc(orig_node
, tt_global
->common
.vid
);
1374 orig_entry
->orig_node
= orig_node
;
1375 orig_entry
->ttvn
= ttvn
;
1376 kref_init(&orig_entry
->refcount
);
1377 kref_get(&orig_entry
->refcount
);
1379 spin_lock_bh(&tt_global
->list_lock
);
1380 hlist_add_head_rcu(&orig_entry
->list
,
1381 &tt_global
->orig_list
);
1382 spin_unlock_bh(&tt_global
->list_lock
);
1383 atomic_inc(&tt_global
->orig_list_count
);
1387 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1391 * batadv_tt_global_add - add a new TT global entry or update an existing one
1392 * @bat_priv: the bat priv with all the soft interface information
1393 * @orig_node: the originator announcing the client
1394 * @tt_addr: the mac address of the non-mesh client
1395 * @vid: VLAN identifier
1396 * @flags: TT flags that have to be set for this non-mesh client
1397 * @ttvn: the tt version number ever announcing this non-mesh client
1399 * Add a new TT global entry for the given originator. If the entry already
1400 * exists add a new reference to the given originator (a global entry can have
1401 * references to multiple originators) and adjust the flags attribute to reflect
1402 * the function argument.
1403 * If a TT local entry exists for this non-mesh client remove it.
1405 * The caller must hold orig_node refcount.
1407 * Return: true if the new entry has been added, false otherwise
1409 static bool batadv_tt_global_add(struct batadv_priv
*bat_priv
,
1410 struct batadv_orig_node
*orig_node
,
1411 const unsigned char *tt_addr
,
1412 unsigned short vid
, u16 flags
, u8 ttvn
)
1414 struct batadv_tt_global_entry
*tt_global_entry
;
1415 struct batadv_tt_local_entry
*tt_local_entry
;
1418 struct batadv_tt_common_entry
*common
;
1421 /* ignore global entries from backbone nodes */
1422 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
, vid
))
1425 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
, vid
);
1426 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
, vid
);
1428 /* if the node already has a local client for this entry, it has to wait
1429 * for a roaming advertisement instead of manually messing up the global
1432 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
1433 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
1436 if (!tt_global_entry
) {
1437 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
1438 if (!tt_global_entry
)
1441 common
= &tt_global_entry
->common
;
1442 ether_addr_copy(common
->addr
, tt_addr
);
1445 common
->flags
= flags
;
1446 tt_global_entry
->roam_at
= 0;
1447 /* node must store current time in case of roaming. This is
1448 * needed to purge this entry out on timeout (if nobody claims
1451 if (flags
& BATADV_TT_CLIENT_ROAM
)
1452 tt_global_entry
->roam_at
= jiffies
;
1453 kref_init(&common
->refcount
);
1454 kref_get(&common
->refcount
);
1455 common
->added_at
= jiffies
;
1457 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
1458 atomic_set(&tt_global_entry
->orig_list_count
, 0);
1459 spin_lock_init(&tt_global_entry
->list_lock
);
1461 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
1463 batadv_choose_tt
, common
,
1464 &common
->hash_entry
);
1466 if (unlikely(hash_added
!= 0)) {
1467 /* remove the reference for the hash */
1468 batadv_tt_global_entry_free_ref(tt_global_entry
);
1472 common
= &tt_global_entry
->common
;
1473 /* If there is already a global entry, we can use this one for
1475 * But if we are trying to add a temporary client then here are
1476 * two options at this point:
1477 * 1) the global client is not a temporary client: the global
1478 * client has to be left as it is, temporary information
1479 * should never override any already known client state
1480 * 2) the global client is a temporary client: purge the
1481 * originator list and add the new one orig_entry
1483 if (flags
& BATADV_TT_CLIENT_TEMP
) {
1484 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
1486 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
1489 batadv_tt_global_del_orig_list(tt_global_entry
);
1490 goto add_orig_entry
;
1493 /* if the client was temporary added before receiving the first
1494 * OGM announcing it, we have to clear the TEMP flag. Also,
1495 * remove the previous temporary orig node and re-add it
1496 * if required. If the orig entry changed, the new one which
1497 * is a non-temporary entry is preferred.
1499 if (common
->flags
& BATADV_TT_CLIENT_TEMP
) {
1500 batadv_tt_global_del_orig_list(tt_global_entry
);
1501 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
1504 /* the change can carry possible "attribute" flags like the
1505 * TT_CLIENT_WIFI, therefore they have to be copied in the
1508 common
->flags
|= flags
;
1510 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1511 * one originator left in the list and we previously received a
1512 * delete + roaming change for this originator.
1514 * We should first delete the old originator before adding the
1517 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
1518 batadv_tt_global_del_orig_list(tt_global_entry
);
1519 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
1520 tt_global_entry
->roam_at
= 0;
1524 /* add the new orig_entry (if needed) or update it */
1525 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
1527 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1528 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1529 common
->addr
, BATADV_PRINT_VID(common
->vid
),
1534 /* Do not remove multicast addresses from the local hash on
1537 if (is_multicast_ether_addr(tt_addr
))
1540 /* remove address from local hash if present */
1541 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
, vid
,
1542 "global tt received",
1543 flags
& BATADV_TT_CLIENT_ROAM
);
1544 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
1546 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
1547 /* this is a normal global add. Therefore the client is not in a
1548 * roaming state anymore.
1550 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
1553 if (tt_global_entry
)
1554 batadv_tt_global_entry_free_ref(tt_global_entry
);
1556 batadv_tt_local_entry_free_ref(tt_local_entry
);
1561 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1562 * @bat_priv: the bat priv with all the soft interface information
1563 * @tt_global_entry: global translation table entry to be analyzed
1565 * This functon assumes the caller holds rcu_read_lock().
1566 * Return: best originator list entry or NULL on errors.
1568 static struct batadv_tt_orig_list_entry
*
1569 batadv_transtable_best_orig(struct batadv_priv
*bat_priv
,
1570 struct batadv_tt_global_entry
*tt_global_entry
)
1572 struct batadv_neigh_node
*router
, *best_router
= NULL
;
1573 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
1574 struct hlist_head
*head
;
1575 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
1577 head
= &tt_global_entry
->orig_list
;
1578 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1579 router
= batadv_orig_router_get(orig_entry
->orig_node
,
1585 bao
->bat_neigh_cmp(router
, BATADV_IF_DEFAULT
,
1586 best_router
, BATADV_IF_DEFAULT
) <= 0) {
1587 batadv_neigh_node_free_ref(router
);
1591 /* release the refcount for the "old" best */
1593 batadv_neigh_node_free_ref(best_router
);
1595 best_entry
= orig_entry
;
1596 best_router
= router
;
1600 batadv_neigh_node_free_ref(best_router
);
1606 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1607 * for this global entry
1608 * @bat_priv: the bat priv with all the soft interface information
1609 * @tt_global_entry: global translation table entry to be printed
1610 * @seq: debugfs table seq_file struct
1612 * This functon assumes the caller holds rcu_read_lock().
1615 batadv_tt_global_print_entry(struct batadv_priv
*bat_priv
,
1616 struct batadv_tt_global_entry
*tt_global_entry
,
1617 struct seq_file
*seq
)
1619 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
1620 struct batadv_tt_common_entry
*tt_common_entry
;
1621 struct batadv_orig_node_vlan
*vlan
;
1622 struct hlist_head
*head
;
1626 tt_common_entry
= &tt_global_entry
->common
;
1627 flags
= tt_common_entry
->flags
;
1629 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1631 vlan
= batadv_orig_node_vlan_get(best_entry
->orig_node
,
1632 tt_common_entry
->vid
);
1635 " * Cannot retrieve VLAN %d for originator %pM\n",
1636 BATADV_PRINT_VID(tt_common_entry
->vid
),
1637 best_entry
->orig_node
->orig
);
1641 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
1643 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1644 '*', tt_global_entry
->common
.addr
,
1645 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1646 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
1647 last_ttvn
, vlan
->tt
.crc
,
1648 ((flags
& BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
1649 ((flags
& BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
1650 ((flags
& BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
1651 ((flags
& BATADV_TT_CLIENT_TEMP
) ? 'T' : '.'));
1653 batadv_orig_node_vlan_free_ref(vlan
);
1657 head
= &tt_global_entry
->orig_list
;
1659 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1660 if (best_entry
== orig_entry
)
1663 vlan
= batadv_orig_node_vlan_get(orig_entry
->orig_node
,
1664 tt_common_entry
->vid
);
1667 " + Cannot retrieve VLAN %d for originator %pM\n",
1668 BATADV_PRINT_VID(tt_common_entry
->vid
),
1669 orig_entry
->orig_node
->orig
);
1673 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
1675 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1676 '+', tt_global_entry
->common
.addr
,
1677 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1678 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1679 last_ttvn
, vlan
->tt
.crc
,
1680 ((flags
& BATADV_TT_CLIENT_ROAM
) ? 'R' : '.'),
1681 ((flags
& BATADV_TT_CLIENT_WIFI
) ? 'W' : '.'),
1682 ((flags
& BATADV_TT_CLIENT_ISOLA
) ? 'I' : '.'),
1683 ((flags
& BATADV_TT_CLIENT_TEMP
) ? 'T' : '.'));
1685 batadv_orig_node_vlan_free_ref(vlan
);
1689 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1691 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1692 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1693 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1694 struct batadv_tt_common_entry
*tt_common_entry
;
1695 struct batadv_tt_global_entry
*tt_global
;
1696 struct batadv_hard_iface
*primary_if
;
1697 struct hlist_head
*head
;
1700 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1705 "Globally announced TT entries received via the mesh %s\n",
1707 seq_printf(seq
, " %-13s %s %s %-15s %s (%-10s) %s\n",
1708 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1711 for (i
= 0; i
< hash
->size
; i
++) {
1712 head
= &hash
->table
[i
];
1715 hlist_for_each_entry_rcu(tt_common_entry
,
1717 tt_global
= container_of(tt_common_entry
,
1718 struct batadv_tt_global_entry
,
1720 batadv_tt_global_print_entry(bat_priv
, tt_global
, seq
);
1726 batadv_hardif_free_ref(primary_if
);
1731 * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1732 * @tt_global_entry: the global entry to remove the orig_entry from
1733 * @orig_entry: the orig entry to remove and free
1735 * Remove an orig_entry from its list in the given tt_global_entry and
1736 * free this orig_entry afterwards.
1738 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1742 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry
*tt_global_entry
,
1743 struct batadv_tt_orig_list_entry
*orig_entry
)
1745 lockdep_assert_held(&tt_global_entry
->list_lock
);
1747 batadv_tt_global_size_dec(orig_entry
->orig_node
,
1748 tt_global_entry
->common
.vid
);
1749 atomic_dec(&tt_global_entry
->orig_list_count
);
1750 /* requires holding tt_global_entry->list_lock and orig_entry->list
1751 * being part of a list
1753 hlist_del_rcu(&orig_entry
->list
);
1754 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1757 /* deletes the orig list of a tt_global_entry */
1759 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1761 struct hlist_head
*head
;
1762 struct hlist_node
*safe
;
1763 struct batadv_tt_orig_list_entry
*orig_entry
;
1765 spin_lock_bh(&tt_global_entry
->list_lock
);
1766 head
= &tt_global_entry
->orig_list
;
1767 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
)
1768 _batadv_tt_global_del_orig_entry(tt_global_entry
, orig_entry
);
1769 spin_unlock_bh(&tt_global_entry
->list_lock
);
1773 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1774 * @bat_priv: the bat priv with all the soft interface information
1775 * @tt_global_entry: the global entry to remove the orig_node from
1776 * @orig_node: the originator announcing the client
1777 * @message: message to append to the log on deletion
1779 * Remove the given orig_node and its according orig_entry from the given
1783 batadv_tt_global_del_orig_node(struct batadv_priv
*bat_priv
,
1784 struct batadv_tt_global_entry
*tt_global_entry
,
1785 struct batadv_orig_node
*orig_node
,
1786 const char *message
)
1788 struct hlist_head
*head
;
1789 struct hlist_node
*safe
;
1790 struct batadv_tt_orig_list_entry
*orig_entry
;
1793 spin_lock_bh(&tt_global_entry
->list_lock
);
1794 head
= &tt_global_entry
->orig_list
;
1795 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1796 if (orig_entry
->orig_node
== orig_node
) {
1797 vid
= tt_global_entry
->common
.vid
;
1798 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1799 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1801 tt_global_entry
->common
.addr
,
1802 BATADV_PRINT_VID(vid
), message
);
1803 _batadv_tt_global_del_orig_entry(tt_global_entry
,
1807 spin_unlock_bh(&tt_global_entry
->list_lock
);
1810 /* If the client is to be deleted, we check if it is the last origantor entry
1811 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1812 * timer, otherwise we simply remove the originator scheduled for deletion.
1815 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1816 struct batadv_tt_global_entry
*tt_global_entry
,
1817 struct batadv_orig_node
*orig_node
,
1818 const char *message
)
1820 bool last_entry
= true;
1821 struct hlist_head
*head
;
1822 struct batadv_tt_orig_list_entry
*orig_entry
;
1824 /* no local entry exists, case 1:
1825 * Check if this is the last one or if other entries exist.
1829 head
= &tt_global_entry
->orig_list
;
1830 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1831 if (orig_entry
->orig_node
!= orig_node
) {
1839 /* its the last one, mark for roaming. */
1840 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1841 tt_global_entry
->roam_at
= jiffies
;
1843 /* there is another entry, we can simply delete this
1844 * one and can still use the other one.
1846 batadv_tt_global_del_orig_node(bat_priv
, tt_global_entry
,
1847 orig_node
, message
);
1851 * batadv_tt_global_del - remove a client from the global table
1852 * @bat_priv: the bat priv with all the soft interface information
1853 * @orig_node: an originator serving this client
1854 * @addr: the mac address of the client
1855 * @vid: VLAN identifier
1856 * @message: a message explaining the reason for deleting the client to print
1857 * for debugging purpose
1858 * @roaming: true if the deletion has been triggered by a roaming event
1860 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1861 struct batadv_orig_node
*orig_node
,
1862 const unsigned char *addr
, unsigned short vid
,
1863 const char *message
, bool roaming
)
1865 struct batadv_tt_global_entry
*tt_global_entry
;
1866 struct batadv_tt_local_entry
*local_entry
= NULL
;
1868 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1869 if (!tt_global_entry
)
1873 batadv_tt_global_del_orig_node(bat_priv
, tt_global_entry
,
1874 orig_node
, message
);
1876 if (hlist_empty(&tt_global_entry
->orig_list
))
1877 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1883 /* if we are deleting a global entry due to a roam
1884 * event, there are two possibilities:
1885 * 1) the client roamed from node A to node B => if there
1886 * is only one originator left for this client, we mark
1887 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1888 * wait for node B to claim it. In case of timeout
1889 * the entry is purged.
1891 * If there are other originators left, we directly delete
1893 * 2) the client roamed to us => we can directly delete
1894 * the global entry, since it is useless now.
1896 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1897 tt_global_entry
->common
.addr
,
1900 /* local entry exists, case 2: client roamed to us. */
1901 batadv_tt_global_del_orig_list(tt_global_entry
);
1902 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1904 /* no local entry exists, case 1: check for roaming */
1905 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1906 orig_node
, message
);
1909 if (tt_global_entry
)
1910 batadv_tt_global_entry_free_ref(tt_global_entry
);
1912 batadv_tt_local_entry_free_ref(local_entry
);
1916 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1917 * given originator matching the provided vid
1918 * @bat_priv: the bat priv with all the soft interface information
1919 * @orig_node: the originator owning the entries to remove
1920 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1922 * @message: debug message to print as "reason"
1924 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1925 struct batadv_orig_node
*orig_node
,
1927 const char *message
)
1929 struct batadv_tt_global_entry
*tt_global
;
1930 struct batadv_tt_common_entry
*tt_common_entry
;
1932 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1933 struct hlist_node
*safe
;
1934 struct hlist_head
*head
;
1935 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1941 for (i
= 0; i
< hash
->size
; i
++) {
1942 head
= &hash
->table
[i
];
1943 list_lock
= &hash
->list_locks
[i
];
1945 spin_lock_bh(list_lock
);
1946 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1948 /* remove only matching entries */
1949 if (match_vid
>= 0 && tt_common_entry
->vid
!= match_vid
)
1952 tt_global
= container_of(tt_common_entry
,
1953 struct batadv_tt_global_entry
,
1956 batadv_tt_global_del_orig_node(bat_priv
, tt_global
,
1957 orig_node
, message
);
1959 if (hlist_empty(&tt_global
->orig_list
)) {
1960 vid
= tt_global
->common
.vid
;
1961 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1962 "Deleting global tt entry %pM (vid: %d): %s\n",
1963 tt_global
->common
.addr
,
1964 BATADV_PRINT_VID(vid
), message
);
1965 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1966 batadv_tt_global_entry_free_ref(tt_global
);
1969 spin_unlock_bh(list_lock
);
1971 clear_bit(BATADV_ORIG_CAPA_HAS_TT
, &orig_node
->capa_initialized
);
1974 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1978 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1979 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1981 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1982 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1984 *msg
= "Roaming timeout\n";
1987 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1988 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1990 *msg
= "Temporary client timeout\n";
1996 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1998 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1999 struct hlist_head
*head
;
2000 struct hlist_node
*node_tmp
;
2001 spinlock_t
*list_lock
; /* protects write access to the hash lists */
2004 struct batadv_tt_common_entry
*tt_common
;
2005 struct batadv_tt_global_entry
*tt_global
;
2007 for (i
= 0; i
< hash
->size
; i
++) {
2008 head
= &hash
->table
[i
];
2009 list_lock
= &hash
->list_locks
[i
];
2011 spin_lock_bh(list_lock
);
2012 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
2014 tt_global
= container_of(tt_common
,
2015 struct batadv_tt_global_entry
,
2018 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
2021 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2022 "Deleting global tt entry %pM (vid: %d): %s\n",
2023 tt_global
->common
.addr
,
2024 BATADV_PRINT_VID(tt_global
->common
.vid
),
2027 hlist_del_rcu(&tt_common
->hash_entry
);
2029 batadv_tt_global_entry_free_ref(tt_global
);
2031 spin_unlock_bh(list_lock
);
2035 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
2037 struct batadv_hashtable
*hash
;
2038 spinlock_t
*list_lock
; /* protects write access to the hash lists */
2039 struct batadv_tt_common_entry
*tt_common_entry
;
2040 struct batadv_tt_global_entry
*tt_global
;
2041 struct hlist_node
*node_tmp
;
2042 struct hlist_head
*head
;
2045 if (!bat_priv
->tt
.global_hash
)
2048 hash
= bat_priv
->tt
.global_hash
;
2050 for (i
= 0; i
< hash
->size
; i
++) {
2051 head
= &hash
->table
[i
];
2052 list_lock
= &hash
->list_locks
[i
];
2054 spin_lock_bh(list_lock
);
2055 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
2057 hlist_del_rcu(&tt_common_entry
->hash_entry
);
2058 tt_global
= container_of(tt_common_entry
,
2059 struct batadv_tt_global_entry
,
2061 batadv_tt_global_entry_free_ref(tt_global
);
2063 spin_unlock_bh(list_lock
);
2066 batadv_hash_destroy(hash
);
2068 bat_priv
->tt
.global_hash
= NULL
;
2072 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
2073 struct batadv_tt_global_entry
*tt_global_entry
)
2077 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
2078 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
2081 /* check if the two clients are marked as isolated */
2082 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
&&
2083 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
)
2090 * batadv_transtable_search - get the mesh destination for a given client
2091 * @bat_priv: the bat priv with all the soft interface information
2092 * @src: mac address of the source client
2093 * @addr: mac address of the destination client
2094 * @vid: VLAN identifier
2096 * Return: a pointer to the originator that was selected as destination in the
2097 * mesh for contacting the client 'addr', NULL otherwise.
2098 * In case of multiple originators serving the same client, the function returns
2099 * the best one (best in terms of metric towards the destination node).
2101 * If the two clients are AP isolated the function returns NULL.
2103 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
2108 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
2109 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
2110 struct batadv_orig_node
*orig_node
= NULL
;
2111 struct batadv_tt_orig_list_entry
*best_entry
;
2113 if (src
&& batadv_vlan_ap_isola_get(bat_priv
, vid
)) {
2114 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
, vid
);
2115 if (!tt_local_entry
||
2116 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
2120 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
2121 if (!tt_global_entry
)
2124 /* check whether the clients should not communicate due to AP
2127 if (tt_local_entry
&&
2128 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
2132 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
2133 /* found anything? */
2135 orig_node
= best_entry
->orig_node
;
2136 if (orig_node
&& !kref_get_unless_zero(&orig_node
->refcount
))
2141 if (tt_global_entry
)
2142 batadv_tt_global_entry_free_ref(tt_global_entry
);
2144 batadv_tt_local_entry_free_ref(tt_local_entry
);
2150 * batadv_tt_global_crc - calculates the checksum of the local table belonging
2151 * to the given orig_node
2152 * @bat_priv: the bat priv with all the soft interface information
2153 * @orig_node: originator for which the CRC should be computed
2154 * @vid: VLAN identifier for which the CRC32 has to be computed
2156 * This function computes the checksum for the global table corresponding to a
2157 * specific originator. In particular, the checksum is computed as follows: For
2158 * each client connected to the originator the CRC32C of the MAC address and the
2159 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2162 * The idea behind is that CRC32C should be used as much as possible in order to
2163 * produce a unique hash of the table, but since the order which is used to feed
2164 * the CRC32C function affects the result and since every node in the network
2165 * probably sorts the clients differently, the hash function cannot be directly
2166 * computed over the entire table. Hence the CRC32C is used only on
2167 * the single client entry, while all the results are then xor'ed together
2168 * because the XOR operation can combine them all while trying to reduce the
2169 * noise as much as possible.
2171 * Return: the checksum of the global table of a given originator.
2173 static u32
batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
2174 struct batadv_orig_node
*orig_node
,
2177 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
2178 struct batadv_tt_common_entry
*tt_common
;
2179 struct batadv_tt_global_entry
*tt_global
;
2180 struct hlist_head
*head
;
2181 u32 i
, crc_tmp
, crc
= 0;
2185 for (i
= 0; i
< hash
->size
; i
++) {
2186 head
= &hash
->table
[i
];
2189 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2190 tt_global
= container_of(tt_common
,
2191 struct batadv_tt_global_entry
,
2193 /* compute the CRC only for entries belonging to the
2194 * VLAN identified by the vid passed as parameter
2196 if (tt_common
->vid
!= vid
)
2199 /* Roaming clients are in the global table for
2200 * consistency only. They don't have to be
2201 * taken into account while computing the
2204 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
2206 /* Temporary clients have not been announced yet, so
2207 * they have to be skipped while computing the global
2210 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
2213 /* find out if this global entry is announced by this
2216 if (!batadv_tt_global_entry_has_orig(tt_global
,
2220 /* use network order to read the VID: this ensures that
2221 * every node reads the bytes in the same order.
2223 tmp_vid
= htons(tt_common
->vid
);
2224 crc_tmp
= crc32c(0, &tmp_vid
, sizeof(tmp_vid
));
2226 /* compute the CRC on flags that have to be kept in sync
2229 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2230 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2232 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2241 * batadv_tt_local_crc - calculates the checksum of the local table
2242 * @bat_priv: the bat priv with all the soft interface information
2243 * @vid: VLAN identifier for which the CRC32 has to be computed
2245 * For details about the computation, please refer to the documentation for
2246 * batadv_tt_global_crc().
2248 * Return: the checksum of the local table
2250 static u32
batadv_tt_local_crc(struct batadv_priv
*bat_priv
,
2253 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2254 struct batadv_tt_common_entry
*tt_common
;
2255 struct hlist_head
*head
;
2256 u32 i
, crc_tmp
, crc
= 0;
2260 for (i
= 0; i
< hash
->size
; i
++) {
2261 head
= &hash
->table
[i
];
2264 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2265 /* compute the CRC only for entries belonging to the
2266 * VLAN identified by vid
2268 if (tt_common
->vid
!= vid
)
2271 /* not yet committed clients have not to be taken into
2272 * account while computing the CRC
2274 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
2277 /* use network order to read the VID: this ensures that
2278 * every node reads the bytes in the same order.
2280 tmp_vid
= htons(tt_common
->vid
);
2281 crc_tmp
= crc32c(0, &tmp_vid
, sizeof(tmp_vid
));
2283 /* compute the CRC on flags that have to be kept in sync
2286 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2287 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2289 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2297 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
2299 struct batadv_tt_req_node
*node
;
2300 struct hlist_node
*safe
;
2302 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2304 hlist_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2305 hlist_del_init(&node
->list
);
2309 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2312 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
2313 struct batadv_orig_node
*orig_node
,
2314 const void *tt_buff
,
2317 /* Replace the old buffer only if I received something in the
2318 * last OGM (the OGM could carry no changes)
2320 spin_lock_bh(&orig_node
->tt_buff_lock
);
2321 if (tt_buff_len
> 0) {
2322 kfree(orig_node
->tt_buff
);
2323 orig_node
->tt_buff_len
= 0;
2324 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
2325 if (orig_node
->tt_buff
) {
2326 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
2327 orig_node
->tt_buff_len
= tt_buff_len
;
2330 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2333 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
2335 struct batadv_tt_req_node
*node
;
2336 struct hlist_node
*safe
;
2338 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2339 hlist_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2340 if (batadv_has_timed_out(node
->issued_at
,
2341 BATADV_TT_REQUEST_TIMEOUT
)) {
2342 hlist_del_init(&node
->list
);
2346 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2350 * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2351 * @bat_priv: the bat priv with all the soft interface information
2352 * @orig_node: orig node this request is being issued for
2354 * Return: the pointer to the new tt_req_node struct if no request
2355 * has already been issued for this orig_node, NULL otherwise.
2357 static struct batadv_tt_req_node
*
2358 batadv_tt_req_node_new(struct batadv_priv
*bat_priv
,
2359 struct batadv_orig_node
*orig_node
)
2361 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
2363 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2364 hlist_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
2365 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
2366 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
2367 BATADV_TT_REQUEST_TIMEOUT
))
2371 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
2375 ether_addr_copy(tt_req_node
->addr
, orig_node
->orig
);
2376 tt_req_node
->issued_at
= jiffies
;
2378 hlist_add_head(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
2380 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2385 * batadv_tt_local_valid - verify that given tt entry is a valid one
2386 * @entry_ptr: to be checked local tt entry
2387 * @data_ptr: not used but definition required to satisfy the callback prototype
2389 * Return: 1 if the entry is a valid, 0 otherwise.
2391 static int batadv_tt_local_valid(const void *entry_ptr
, const void *data_ptr
)
2393 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2395 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
2400 static int batadv_tt_global_valid(const void *entry_ptr
,
2401 const void *data_ptr
)
2403 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2404 const struct batadv_tt_global_entry
*tt_global_entry
;
2405 const struct batadv_orig_node
*orig_node
= data_ptr
;
2407 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
2408 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
2411 tt_global_entry
= container_of(tt_common_entry
,
2412 struct batadv_tt_global_entry
,
2415 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
2419 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2421 * @bat_priv: the bat priv with all the soft interface information
2422 * @hash: hash table containing the tt entries
2423 * @tt_len: expected tvlv tt data buffer length in number of bytes
2424 * @tvlv_buff: pointer to the buffer to fill with the TT data
2425 * @valid_cb: function to filter tt change entries
2426 * @cb_data: data passed to the filter function as argument
2428 static void batadv_tt_tvlv_generate(struct batadv_priv
*bat_priv
,
2429 struct batadv_hashtable
*hash
,
2430 void *tvlv_buff
, u16 tt_len
,
2431 int (*valid_cb
)(const void *, const void *),
2434 struct batadv_tt_common_entry
*tt_common_entry
;
2435 struct batadv_tvlv_tt_change
*tt_change
;
2436 struct hlist_head
*head
;
2437 u16 tt_tot
, tt_num_entries
= 0;
2440 tt_tot
= batadv_tt_entries(tt_len
);
2441 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_buff
;
2444 for (i
= 0; i
< hash
->size
; i
++) {
2445 head
= &hash
->table
[i
];
2447 hlist_for_each_entry_rcu(tt_common_entry
,
2449 if (tt_tot
== tt_num_entries
)
2452 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
2455 ether_addr_copy(tt_change
->addr
, tt_common_entry
->addr
);
2456 tt_change
->flags
= tt_common_entry
->flags
;
2457 tt_change
->vid
= htons(tt_common_entry
->vid
);
2458 memset(tt_change
->reserved
, 0,
2459 sizeof(tt_change
->reserved
));
2469 * batadv_tt_global_check_crc - check if all the CRCs are correct
2470 * @orig_node: originator for which the CRCs have to be checked
2471 * @tt_vlan: pointer to the first tvlv VLAN entry
2472 * @num_vlan: number of tvlv VLAN entries
2474 * Return: true if all the received CRCs match the locally stored ones, false
2477 static bool batadv_tt_global_check_crc(struct batadv_orig_node
*orig_node
,
2478 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2481 struct batadv_tvlv_tt_vlan_data
*tt_vlan_tmp
;
2482 struct batadv_orig_node_vlan
*vlan
;
2483 int i
, orig_num_vlan
;
2486 /* check if each received CRC matches the locally stored one */
2487 for (i
= 0; i
< num_vlan
; i
++) {
2488 tt_vlan_tmp
= tt_vlan
+ i
;
2490 /* if orig_node is a backbone node for this VLAN, don't check
2491 * the CRC as we ignore all the global entries over it
2493 if (batadv_bla_is_backbone_gw_orig(orig_node
->bat_priv
,
2495 ntohs(tt_vlan_tmp
->vid
)))
2498 vlan
= batadv_orig_node_vlan_get(orig_node
,
2499 ntohs(tt_vlan_tmp
->vid
));
2504 batadv_orig_node_vlan_free_ref(vlan
);
2506 if (crc
!= ntohl(tt_vlan_tmp
->crc
))
2510 /* check if any excess VLANs exist locally for the originator
2511 * which are not mentioned in the TVLV from the originator.
2515 hlist_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
)
2519 if (orig_num_vlan
> num_vlan
)
2526 * batadv_tt_local_update_crc - update all the local CRCs
2527 * @bat_priv: the bat priv with all the soft interface information
2529 static void batadv_tt_local_update_crc(struct batadv_priv
*bat_priv
)
2531 struct batadv_softif_vlan
*vlan
;
2533 /* recompute the global CRC for each VLAN */
2535 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
2536 vlan
->tt
.crc
= batadv_tt_local_crc(bat_priv
, vlan
->vid
);
2542 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2543 * @bat_priv: the bat priv with all the soft interface information
2544 * @orig_node: the orig_node for which the CRCs have to be updated
2546 static void batadv_tt_global_update_crc(struct batadv_priv
*bat_priv
,
2547 struct batadv_orig_node
*orig_node
)
2549 struct batadv_orig_node_vlan
*vlan
;
2552 /* recompute the global CRC for each VLAN */
2554 hlist_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
2555 /* if orig_node is a backbone node for this VLAN, don't compute
2556 * the CRC as we ignore all the global entries over it
2558 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
,
2562 crc
= batadv_tt_global_crc(bat_priv
, orig_node
, vlan
->vid
);
2569 * batadv_send_tt_request - send a TT Request message to a given node
2570 * @bat_priv: the bat priv with all the soft interface information
2571 * @dst_orig_node: the destination of the message
2572 * @ttvn: the version number that the source of the message is looking for
2573 * @tt_vlan: pointer to the first tvlv VLAN object to request
2574 * @num_vlan: number of tvlv VLAN entries
2575 * @full_table: ask for the entire translation table if true, while only for the
2576 * last TT diff otherwise
2578 * Return: true if the TT Request was sent, false otherwise
2580 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
2581 struct batadv_orig_node
*dst_orig_node
,
2583 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2584 u16 num_vlan
, bool full_table
)
2586 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2587 struct batadv_tt_req_node
*tt_req_node
= NULL
;
2588 struct batadv_tvlv_tt_vlan_data
*tt_vlan_req
;
2589 struct batadv_hard_iface
*primary_if
;
2593 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2597 /* The new tt_req will be issued only if I'm not waiting for a
2598 * reply from the same orig_node yet
2600 tt_req_node
= batadv_tt_req_node_new(bat_priv
, dst_orig_node
);
2604 size
= sizeof(*tvlv_tt_data
) + sizeof(*tt_vlan_req
) * num_vlan
;
2605 tvlv_tt_data
= kzalloc(size
, GFP_ATOMIC
);
2609 tvlv_tt_data
->flags
= BATADV_TT_REQUEST
;
2610 tvlv_tt_data
->ttvn
= ttvn
;
2611 tvlv_tt_data
->num_vlan
= htons(num_vlan
);
2613 /* send all the CRCs within the request. This is needed by intermediate
2614 * nodes to ensure they have the correct table before replying
2616 tt_vlan_req
= (struct batadv_tvlv_tt_vlan_data
*)(tvlv_tt_data
+ 1);
2617 for (i
= 0; i
< num_vlan
; i
++) {
2618 tt_vlan_req
->vid
= tt_vlan
->vid
;
2619 tt_vlan_req
->crc
= tt_vlan
->crc
;
2626 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2628 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
2629 dst_orig_node
->orig
, full_table
? 'F' : '.');
2631 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
2632 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2633 dst_orig_node
->orig
, BATADV_TVLV_TT
, 1,
2634 tvlv_tt_data
, size
);
2639 batadv_hardif_free_ref(primary_if
);
2640 if (ret
&& tt_req_node
) {
2641 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2642 /* hlist_del_init() verifies tt_req_node still is in the list */
2643 hlist_del_init(&tt_req_node
->list
);
2644 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2647 kfree(tvlv_tt_data
);
2652 * batadv_send_other_tt_response - send reply to tt request concerning another
2653 * node's translation table
2654 * @bat_priv: the bat priv with all the soft interface information
2655 * @tt_data: tt data containing the tt request information
2656 * @req_src: mac address of tt request sender
2657 * @req_dst: mac address of tt request recipient
2659 * Return: true if tt request reply was sent, false otherwise.
2661 static bool batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
2662 struct batadv_tvlv_tt_data
*tt_data
,
2663 u8
*req_src
, u8
*req_dst
)
2665 struct batadv_orig_node
*req_dst_orig_node
;
2666 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
2667 struct batadv_tvlv_tt_change
*tt_change
;
2668 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2669 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
2670 bool ret
= false, full_table
;
2671 u8 orig_ttvn
, req_ttvn
;
2675 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2676 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2677 req_src
, tt_data
->ttvn
, req_dst
,
2678 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
2680 /* Let's get the orig node of the REAL destination */
2681 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_dst
);
2682 if (!req_dst_orig_node
)
2685 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2686 if (!res_dst_orig_node
)
2689 orig_ttvn
= (u8
)atomic_read(&req_dst_orig_node
->last_ttvn
);
2690 req_ttvn
= tt_data
->ttvn
;
2692 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
2693 /* this node doesn't have the requested data */
2694 if (orig_ttvn
!= req_ttvn
||
2695 !batadv_tt_global_check_crc(req_dst_orig_node
, tt_vlan
,
2696 ntohs(tt_data
->num_vlan
)))
2699 /* If the full table has been explicitly requested */
2700 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
||
2701 !req_dst_orig_node
->tt_buff
)
2706 /* TT fragmentation hasn't been implemented yet, so send as many
2707 * TT entries fit a single packet as possible only
2710 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
2711 tt_len
= req_dst_orig_node
->tt_buff_len
;
2713 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2720 /* Copy the last orig_node's OGM buffer */
2721 memcpy(tt_change
, req_dst_orig_node
->tt_buff
,
2722 req_dst_orig_node
->tt_buff_len
);
2723 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2725 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2726 * in the initial part
2729 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2736 /* fill the rest of the tvlv with the real TT entries */
2737 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.global_hash
,
2739 batadv_tt_global_valid
,
2743 /* Don't send the response, if larger than fragmented packet. */
2744 tt_len
= sizeof(struct batadv_unicast_tvlv_packet
) + tvlv_len
;
2745 if (tt_len
> atomic_read(&bat_priv
->packet_size_max
)) {
2746 net_ratelimited_function(batadv_info
, bat_priv
->soft_iface
,
2747 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2748 res_dst_orig_node
->orig
);
2752 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2753 tvlv_tt_data
->ttvn
= req_ttvn
;
2756 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2758 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2759 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2760 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
,
2761 full_table
? 'F' : '.', req_ttvn
);
2763 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2765 batadv_tvlv_unicast_send(bat_priv
, req_dst_orig_node
->orig
,
2766 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2773 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2776 if (res_dst_orig_node
)
2777 batadv_orig_node_free_ref(res_dst_orig_node
);
2778 if (req_dst_orig_node
)
2779 batadv_orig_node_free_ref(req_dst_orig_node
);
2780 kfree(tvlv_tt_data
);
2785 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2787 * @bat_priv: the bat priv with all the soft interface information
2788 * @tt_data: tt data containing the tt request information
2789 * @req_src: mac address of tt request sender
2791 * Return: true if tt request reply was sent, false otherwise.
2793 static bool batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
2794 struct batadv_tvlv_tt_data
*tt_data
,
2797 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2798 struct batadv_hard_iface
*primary_if
= NULL
;
2799 struct batadv_tvlv_tt_change
*tt_change
;
2800 struct batadv_orig_node
*orig_node
;
2801 u8 my_ttvn
, req_ttvn
;
2806 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2807 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2808 req_src
, tt_data
->ttvn
,
2809 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
2811 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2813 my_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
2814 req_ttvn
= tt_data
->ttvn
;
2816 orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2820 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2824 /* If the full table has been explicitly requested or the gap
2825 * is too big send the whole local translation table
2827 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
2828 !bat_priv
->tt
.last_changeset
)
2833 /* TT fragmentation hasn't been implemented yet, so send as many
2834 * TT entries fit a single packet as possible only
2837 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
2839 tt_len
= bat_priv
->tt
.last_changeset_len
;
2840 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2847 /* Copy the last orig_node's OGM buffer */
2848 memcpy(tt_change
, bat_priv
->tt
.last_changeset
,
2849 bat_priv
->tt
.last_changeset_len
);
2850 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2852 req_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
2854 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2855 * in the initial part
2858 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2865 /* fill the rest of the tvlv with the real TT entries */
2866 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.local_hash
,
2868 batadv_tt_local_valid
, NULL
);
2871 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2872 tvlv_tt_data
->ttvn
= req_ttvn
;
2875 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2877 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2878 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2879 orig_node
->orig
, full_table
? 'F' : '.', req_ttvn
);
2881 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2883 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2884 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2890 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2892 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2894 batadv_orig_node_free_ref(orig_node
);
2896 batadv_hardif_free_ref(primary_if
);
2897 kfree(tvlv_tt_data
);
2898 /* The packet was for this host, so it doesn't need to be re-routed */
2903 * batadv_send_tt_response - send reply to tt request
2904 * @bat_priv: the bat priv with all the soft interface information
2905 * @tt_data: tt data containing the tt request information
2906 * @req_src: mac address of tt request sender
2907 * @req_dst: mac address of tt request recipient
2909 * Return: true if tt request reply was sent, false otherwise.
2911 static bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
2912 struct batadv_tvlv_tt_data
*tt_data
,
2913 u8
*req_src
, u8
*req_dst
)
2915 if (batadv_is_my_mac(bat_priv
, req_dst
))
2916 return batadv_send_my_tt_response(bat_priv
, tt_data
, req_src
);
2917 return batadv_send_other_tt_response(bat_priv
, tt_data
, req_src
,
2921 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2922 struct batadv_orig_node
*orig_node
,
2923 struct batadv_tvlv_tt_change
*tt_change
,
2924 u16 tt_num_changes
, u8 ttvn
)
2929 for (i
= 0; i
< tt_num_changes
; i
++) {
2930 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
2931 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
2932 batadv_tt_global_del(bat_priv
, orig_node
,
2933 (tt_change
+ i
)->addr
,
2934 ntohs((tt_change
+ i
)->vid
),
2935 "tt removed by changes",
2938 if (!batadv_tt_global_add(bat_priv
, orig_node
,
2939 (tt_change
+ i
)->addr
,
2940 ntohs((tt_change
+ i
)->vid
),
2941 (tt_change
+ i
)->flags
, ttvn
))
2942 /* In case of problem while storing a
2943 * global_entry, we stop the updating
2944 * procedure without committing the
2945 * ttvn change. This will avoid to send
2946 * corrupted data on tt_request
2951 set_bit(BATADV_ORIG_CAPA_HAS_TT
, &orig_node
->capa_initialized
);
2954 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
2955 struct batadv_tvlv_tt_change
*tt_change
,
2956 u8 ttvn
, u8
*resp_src
,
2959 struct batadv_orig_node
*orig_node
;
2961 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2965 /* Purge the old table first.. */
2966 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
2967 "Received full table");
2969 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
, num_entries
,
2972 spin_lock_bh(&orig_node
->tt_buff_lock
);
2973 kfree(orig_node
->tt_buff
);
2974 orig_node
->tt_buff_len
= 0;
2975 orig_node
->tt_buff
= NULL
;
2976 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2978 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2982 batadv_orig_node_free_ref(orig_node
);
2985 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2986 struct batadv_orig_node
*orig_node
,
2987 u16 tt_num_changes
, u8 ttvn
,
2988 struct batadv_tvlv_tt_change
*tt_change
)
2990 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2991 tt_num_changes
, ttvn
);
2993 batadv_tt_save_orig_buffer(bat_priv
, orig_node
, tt_change
,
2994 batadv_tt_len(tt_num_changes
));
2995 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2999 * batadv_is_my_client - check if a client is served by the local node
3000 * @bat_priv: the bat priv with all the soft interface information
3001 * @addr: the mac address of the client to check
3002 * @vid: VLAN identifier
3004 * Return: true if the client is served by this node, false otherwise.
3006 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const u8
*addr
,
3009 struct batadv_tt_local_entry
*tt_local_entry
;
3012 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3013 if (!tt_local_entry
)
3015 /* Check if the client has been logically deleted (but is kept for
3016 * consistency purpose)
3018 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
3019 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
3024 batadv_tt_local_entry_free_ref(tt_local_entry
);
3029 * batadv_handle_tt_response - process incoming tt reply
3030 * @bat_priv: the bat priv with all the soft interface information
3031 * @tt_data: tt data containing the tt request information
3032 * @resp_src: mac address of tt reply sender
3033 * @num_entries: number of tt change entries appended to the tt data
3035 static void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
3036 struct batadv_tvlv_tt_data
*tt_data
,
3037 u8
*resp_src
, u16 num_entries
)
3039 struct batadv_tt_req_node
*node
;
3040 struct hlist_node
*safe
;
3041 struct batadv_orig_node
*orig_node
= NULL
;
3042 struct batadv_tvlv_tt_change
*tt_change
;
3043 u8
*tvlv_ptr
= (u8
*)tt_data
;
3046 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3047 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3048 resp_src
, tt_data
->ttvn
, num_entries
,
3049 ((tt_data
->flags
& BATADV_TT_FULL_TABLE
) ? 'F' : '.'));
3051 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
3055 spin_lock_bh(&orig_node
->tt_lock
);
3057 change_offset
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3058 change_offset
*= ntohs(tt_data
->num_vlan
);
3059 change_offset
+= sizeof(*tt_data
);
3060 tvlv_ptr
+= change_offset
;
3062 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_ptr
;
3063 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
) {
3064 batadv_tt_fill_gtable(bat_priv
, tt_change
, tt_data
->ttvn
,
3065 resp_src
, num_entries
);
3067 batadv_tt_update_changes(bat_priv
, orig_node
, num_entries
,
3068 tt_data
->ttvn
, tt_change
);
3071 /* Recalculate the CRC for this orig_node and store it */
3072 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3074 spin_unlock_bh(&orig_node
->tt_lock
);
3076 /* Delete the tt_req_node from pending tt_requests list */
3077 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
3078 hlist_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
3079 if (!batadv_compare_eth(node
->addr
, resp_src
))
3081 hlist_del_init(&node
->list
);
3085 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
3088 batadv_orig_node_free_ref(orig_node
);
3091 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
3093 struct batadv_tt_roam_node
*node
, *safe
;
3095 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
3097 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
3098 list_del(&node
->list
);
3102 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
3105 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
3107 struct batadv_tt_roam_node
*node
, *safe
;
3109 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
3110 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
3111 if (!batadv_has_timed_out(node
->first_time
,
3112 BATADV_ROAMING_MAX_TIME
))
3115 list_del(&node
->list
);
3118 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
3122 * batadv_tt_check_roam_count - check if a client has roamed too frequently
3123 * @bat_priv: the bat priv with all the soft interface information
3124 * @client: mac address of the roaming client
3126 * This function checks whether the client already reached the
3127 * maximum number of possible roaming phases. In this case the ROAMING_ADV
3130 * Return: true if the ROAMING_ADV can be sent, false otherwise
3132 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
, u8
*client
)
3134 struct batadv_tt_roam_node
*tt_roam_node
;
3137 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
3138 /* The new tt_req will be issued only if I'm not waiting for a
3139 * reply from the same orig_node yet
3141 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
3142 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
3145 if (batadv_has_timed_out(tt_roam_node
->first_time
,
3146 BATADV_ROAMING_MAX_TIME
))
3149 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
3150 /* Sorry, you roamed too many times! */
3157 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
3161 tt_roam_node
->first_time
= jiffies
;
3162 atomic_set(&tt_roam_node
->counter
,
3163 BATADV_ROAMING_MAX_COUNT
- 1);
3164 ether_addr_copy(tt_roam_node
->addr
, client
);
3166 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
3171 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
3176 * batadv_send_roam_adv - send a roaming advertisement message
3177 * @bat_priv: the bat priv with all the soft interface information
3178 * @client: mac address of the roaming client
3179 * @vid: VLAN identifier
3180 * @orig_node: message destination
3182 * Send a ROAMING_ADV message to the node which was previously serving this
3183 * client. This is done to inform the node that from now on all traffic destined
3184 * for this particular roamed client has to be forwarded to the sender of the
3187 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, u8
*client
,
3189 struct batadv_orig_node
*orig_node
)
3191 struct batadv_hard_iface
*primary_if
;
3192 struct batadv_tvlv_roam_adv tvlv_roam
;
3194 primary_if
= batadv_primary_if_get_selected(bat_priv
);
3198 /* before going on we have to check whether the client has
3199 * already roamed to us too many times
3201 if (!batadv_tt_check_roam_count(bat_priv
, client
))
3204 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3205 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3206 orig_node
->orig
, client
, BATADV_PRINT_VID(vid
));
3208 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
3210 memcpy(tvlv_roam
.client
, client
, sizeof(tvlv_roam
.client
));
3211 tvlv_roam
.vid
= htons(vid
);
3213 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
3214 orig_node
->orig
, BATADV_TVLV_ROAM
, 1,
3215 &tvlv_roam
, sizeof(tvlv_roam
));
3219 batadv_hardif_free_ref(primary_if
);
3222 static void batadv_tt_purge(struct work_struct
*work
)
3224 struct delayed_work
*delayed_work
;
3225 struct batadv_priv_tt
*priv_tt
;
3226 struct batadv_priv
*bat_priv
;
3228 delayed_work
= container_of(work
, struct delayed_work
, work
);
3229 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
3230 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
3232 batadv_tt_local_purge(bat_priv
, BATADV_TT_LOCAL_TIMEOUT
);
3233 batadv_tt_global_purge(bat_priv
);
3234 batadv_tt_req_purge(bat_priv
);
3235 batadv_tt_roam_purge(bat_priv
);
3237 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3238 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3241 void batadv_tt_free(struct batadv_priv
*bat_priv
)
3243 batadv_tvlv_container_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3244 batadv_tvlv_handler_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3246 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
3248 batadv_tt_local_table_free(bat_priv
);
3249 batadv_tt_global_table_free(bat_priv
);
3250 batadv_tt_req_list_free(bat_priv
);
3251 batadv_tt_changes_list_free(bat_priv
);
3252 batadv_tt_roam_list_free(bat_priv
);
3254 kfree(bat_priv
->tt
.last_changeset
);
3258 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3259 * table and possibly count them in the TT size
3260 * @bat_priv: the bat priv with all the soft interface information
3261 * @flags: the flag to switch
3262 * @enable: whether to set or unset the flag
3263 * @count: whether to increase the TT size by the number of changed entries
3265 static void batadv_tt_local_set_flags(struct batadv_priv
*bat_priv
, u16 flags
,
3266 bool enable
, bool count
)
3268 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3269 struct batadv_tt_common_entry
*tt_common_entry
;
3270 u16 changed_num
= 0;
3271 struct hlist_head
*head
;
3277 for (i
= 0; i
< hash
->size
; i
++) {
3278 head
= &hash
->table
[i
];
3281 hlist_for_each_entry_rcu(tt_common_entry
,
3284 if ((tt_common_entry
->flags
& flags
) == flags
)
3286 tt_common_entry
->flags
|= flags
;
3288 if (!(tt_common_entry
->flags
& flags
))
3290 tt_common_entry
->flags
&= ~flags
;
3297 batadv_tt_local_size_inc(bat_priv
,
3298 tt_common_entry
->vid
);
3304 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3305 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
3307 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3308 struct batadv_tt_common_entry
*tt_common
;
3309 struct batadv_tt_local_entry
*tt_local
;
3310 struct batadv_softif_vlan
*vlan
;
3311 struct hlist_node
*node_tmp
;
3312 struct hlist_head
*head
;
3313 spinlock_t
*list_lock
; /* protects write access to the hash lists */
3319 for (i
= 0; i
< hash
->size
; i
++) {
3320 head
= &hash
->table
[i
];
3321 list_lock
= &hash
->list_locks
[i
];
3323 spin_lock_bh(list_lock
);
3324 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
3326 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
3329 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3330 "Deleting local tt entry (%pM, vid: %d): pending\n",
3332 BATADV_PRINT_VID(tt_common
->vid
));
3334 batadv_tt_local_size_dec(bat_priv
, tt_common
->vid
);
3335 hlist_del_rcu(&tt_common
->hash_entry
);
3336 tt_local
= container_of(tt_common
,
3337 struct batadv_tt_local_entry
,
3340 /* decrease the reference held for this vlan */
3341 vlan
= batadv_softif_vlan_get(bat_priv
, tt_common
->vid
);
3343 batadv_softif_vlan_free_ref(vlan
);
3344 batadv_softif_vlan_free_ref(vlan
);
3347 batadv_tt_local_entry_free_ref(tt_local
);
3349 spin_unlock_bh(list_lock
);
3354 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3355 * which have been queued in the time since the last commit
3356 * @bat_priv: the bat priv with all the soft interface information
3358 * Caller must hold tt->commit_lock.
3360 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv
*bat_priv
)
3362 lockdep_assert_held(&bat_priv
->tt
.commit_lock
);
3364 /* Update multicast addresses in local translation table */
3365 batadv_mcast_mla_update(bat_priv
);
3367 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1) {
3368 if (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))
3369 batadv_tt_tvlv_container_update(bat_priv
);
3373 batadv_tt_local_set_flags(bat_priv
, BATADV_TT_CLIENT_NEW
, false, true);
3375 batadv_tt_local_purge_pending_clients(bat_priv
);
3376 batadv_tt_local_update_crc(bat_priv
);
3378 /* Increment the TTVN only once per OGM interval */
3379 atomic_inc(&bat_priv
->tt
.vn
);
3380 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3381 "Local changes committed, updating to ttvn %u\n",
3382 (u8
)atomic_read(&bat_priv
->tt
.vn
));
3384 /* reset the sending counter */
3385 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
3386 batadv_tt_tvlv_container_update(bat_priv
);
3390 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3391 * have been queued in the time since the last commit
3392 * @bat_priv: the bat priv with all the soft interface information
3394 void batadv_tt_local_commit_changes(struct batadv_priv
*bat_priv
)
3396 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3397 batadv_tt_local_commit_changes_nolock(bat_priv
);
3398 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3401 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, u8
*src
, u8
*dst
,
3404 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
3405 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
3406 struct batadv_softif_vlan
*vlan
;
3409 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
3413 if (!atomic_read(&vlan
->ap_isolation
))
3416 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
, vid
);
3417 if (!tt_local_entry
)
3420 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
, vid
);
3421 if (!tt_global_entry
)
3424 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
3430 batadv_softif_vlan_free_ref(vlan
);
3431 if (tt_global_entry
)
3432 batadv_tt_global_entry_free_ref(tt_global_entry
);
3434 batadv_tt_local_entry_free_ref(tt_local_entry
);
3439 * batadv_tt_update_orig - update global translation table with new tt
3440 * information received via ogms
3441 * @bat_priv: the bat priv with all the soft interface information
3442 * @orig_node: the orig_node of the ogm
3443 * @tt_buff: pointer to the first tvlv VLAN entry
3444 * @tt_num_vlan: number of tvlv VLAN entries
3445 * @tt_change: pointer to the first entry in the TT buffer
3446 * @tt_num_changes: number of tt changes inside the tt buffer
3447 * @ttvn: translation table version number of this changeset
3449 static void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
3450 struct batadv_orig_node
*orig_node
,
3451 const void *tt_buff
, u16 tt_num_vlan
,
3452 struct batadv_tvlv_tt_change
*tt_change
,
3453 u16 tt_num_changes
, u8 ttvn
)
3455 u8 orig_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
3456 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3457 bool full_table
= true;
3460 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)tt_buff
;
3461 has_tt_init
= test_bit(BATADV_ORIG_CAPA_HAS_TT
,
3462 &orig_node
->capa_initialized
);
3464 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3465 * increased by one -> we can apply the attached changes
3467 if ((!has_tt_init
&& ttvn
== 1) || ttvn
- orig_ttvn
== 1) {
3468 /* the OGM could not contain the changes due to their size or
3469 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3471 * In this case send a tt request
3473 if (!tt_num_changes
) {
3478 spin_lock_bh(&orig_node
->tt_lock
);
3480 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
3483 /* Even if we received the precomputed crc with the OGM, we
3484 * prefer to recompute it to spot any possible inconsistency
3485 * in the global table
3487 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3489 spin_unlock_bh(&orig_node
->tt_lock
);
3491 /* The ttvn alone is not enough to guarantee consistency
3492 * because a single value could represent different states
3493 * (due to the wrap around). Thus a node has to check whether
3494 * the resulting table (after applying the changes) is still
3495 * consistent or not. E.g. a node could disconnect while its
3496 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3497 * checking the CRC value is mandatory to detect the
3500 if (!batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3504 /* if we missed more than one change or our tables are not
3505 * in sync anymore -> request fresh tt data
3507 if (!has_tt_init
|| ttvn
!= orig_ttvn
||
3508 !batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3511 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3512 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3513 orig_node
->orig
, ttvn
, orig_ttvn
,
3515 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
3516 tt_vlan
, tt_num_vlan
,
3524 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3525 * @bat_priv: the bat priv with all the soft interface information
3526 * @addr: the mac address of the client to check
3527 * @vid: VLAN identifier
3529 * Return: true if we know that the client has moved from its old originator
3530 * to another one. This entry is still kept for consistency purposes and will be
3531 * deleted later by a DEL or because of timeout
3533 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
3534 u8
*addr
, unsigned short vid
)
3536 struct batadv_tt_global_entry
*tt_global_entry
;
3539 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3540 if (!tt_global_entry
)
3543 ret
= tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3544 batadv_tt_global_entry_free_ref(tt_global_entry
);
3550 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3551 * @bat_priv: the bat priv with all the soft interface information
3552 * @addr: the mac address of the local client to query
3553 * @vid: VLAN identifier
3555 * Return: true if the local client is known to be roaming (it is not served by
3556 * this node anymore) or not. If yes, the client is still present in the table
3557 * to keep the latter consistent with the node TTVN
3559 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
3560 u8
*addr
, unsigned short vid
)
3562 struct batadv_tt_local_entry
*tt_local_entry
;
3565 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3566 if (!tt_local_entry
)
3569 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3570 batadv_tt_local_entry_free_ref(tt_local_entry
);
3575 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
3576 struct batadv_orig_node
*orig_node
,
3577 const unsigned char *addr
,
3582 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
, vid
,
3583 BATADV_TT_CLIENT_TEMP
,
3584 atomic_read(&orig_node
->last_ttvn
)))
3587 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3588 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3589 addr
, BATADV_PRINT_VID(vid
), orig_node
->orig
);
3596 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3597 * maximum packet size that can be transported through the mesh
3598 * @soft_iface: netdev struct of the mesh interface
3600 * Remove entries older than 'timeout' and half timeout if more entries need
3603 void batadv_tt_local_resize_to_mtu(struct net_device
*soft_iface
)
3605 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
3606 int packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
3607 int table_size
, timeout
= BATADV_TT_LOCAL_TIMEOUT
/ 2;
3608 bool reduced
= false;
3610 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3613 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
3614 if (packet_size_max
>= table_size
)
3617 batadv_tt_local_purge(bat_priv
, timeout
);
3618 batadv_tt_local_purge_pending_clients(bat_priv
);
3622 net_ratelimited_function(batadv_info
, soft_iface
,
3623 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3627 /* commit these changes immediately, to avoid synchronization problem
3631 batadv_tt_local_commit_changes_nolock(bat_priv
);
3633 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3637 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3638 * @bat_priv: the bat priv with all the soft interface information
3639 * @orig: the orig_node of the ogm
3640 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3641 * @tvlv_value: tvlv buffer containing the gateway data
3642 * @tvlv_value_len: tvlv buffer length
3644 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv
*bat_priv
,
3645 struct batadv_orig_node
*orig
,
3646 u8 flags
, void *tvlv_value
,
3649 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3650 struct batadv_tvlv_tt_change
*tt_change
;
3651 struct batadv_tvlv_tt_data
*tt_data
;
3652 u16 num_entries
, num_vlan
;
3654 if (tvlv_value_len
< sizeof(*tt_data
))
3657 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3658 tvlv_value_len
-= sizeof(*tt_data
);
3660 num_vlan
= ntohs(tt_data
->num_vlan
);
3662 if (tvlv_value_len
< sizeof(*tt_vlan
) * num_vlan
)
3665 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
3666 tt_change
= (struct batadv_tvlv_tt_change
*)(tt_vlan
+ num_vlan
);
3667 tvlv_value_len
-= sizeof(*tt_vlan
) * num_vlan
;
3669 num_entries
= batadv_tt_entries(tvlv_value_len
);
3671 batadv_tt_update_orig(bat_priv
, orig
, tt_vlan
, num_vlan
, tt_change
,
3672 num_entries
, tt_data
->ttvn
);
3676 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3678 * @bat_priv: the bat priv with all the soft interface information
3679 * @src: mac address of tt tvlv sender
3680 * @dst: mac address of tt tvlv recipient
3681 * @tvlv_value: tvlv buffer containing the tt data
3682 * @tvlv_value_len: tvlv buffer length
3684 * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3687 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3692 struct batadv_tvlv_tt_data
*tt_data
;
3693 u16 tt_vlan_len
, tt_num_entries
;
3697 if (tvlv_value_len
< sizeof(*tt_data
))
3698 return NET_RX_SUCCESS
;
3700 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3701 tvlv_value_len
-= sizeof(*tt_data
);
3703 tt_vlan_len
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3704 tt_vlan_len
*= ntohs(tt_data
->num_vlan
);
3706 if (tvlv_value_len
< tt_vlan_len
)
3707 return NET_RX_SUCCESS
;
3709 tvlv_value_len
-= tt_vlan_len
;
3710 tt_num_entries
= batadv_tt_entries(tvlv_value_len
);
3712 switch (tt_data
->flags
& BATADV_TT_DATA_TYPE_MASK
) {
3713 case BATADV_TT_REQUEST
:
3714 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
3716 /* If this node cannot provide a TT response the tt_request is
3719 ret
= batadv_send_tt_response(bat_priv
, tt_data
, src
, dst
);
3721 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3726 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3727 "Routing TT_REQUEST to %pM [%c]\n",
3729 /* tvlv API will re-route the packet */
3733 case BATADV_TT_RESPONSE
:
3734 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
3736 if (batadv_is_my_mac(bat_priv
, dst
)) {
3737 batadv_handle_tt_response(bat_priv
, tt_data
,
3738 src
, tt_num_entries
);
3739 return NET_RX_SUCCESS
;
3742 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3747 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3748 "Routing TT_RESPONSE to %pM [%c]\n", dst
, tt_flag
);
3750 /* tvlv API will re-route the packet */
3754 return NET_RX_SUCCESS
;
3758 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3759 * @bat_priv: the bat priv with all the soft interface information
3760 * @src: mac address of tt tvlv sender
3761 * @dst: mac address of tt tvlv recipient
3762 * @tvlv_value: tvlv buffer containing the tt data
3763 * @tvlv_value_len: tvlv buffer length
3765 * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3768 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3773 struct batadv_tvlv_roam_adv
*roaming_adv
;
3774 struct batadv_orig_node
*orig_node
= NULL
;
3776 /* If this node is not the intended recipient of the
3777 * roaming advertisement the packet is forwarded
3778 * (the tvlv API will re-route the packet).
3780 if (!batadv_is_my_mac(bat_priv
, dst
))
3783 if (tvlv_value_len
< sizeof(*roaming_adv
))
3786 orig_node
= batadv_orig_hash_find(bat_priv
, src
);
3790 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
3791 roaming_adv
= (struct batadv_tvlv_roam_adv
*)tvlv_value
;
3793 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3794 "Received ROAMING_ADV from %pM (client %pM)\n",
3795 src
, roaming_adv
->client
);
3797 batadv_tt_global_add(bat_priv
, orig_node
, roaming_adv
->client
,
3798 ntohs(roaming_adv
->vid
), BATADV_TT_CLIENT_ROAM
,
3799 atomic_read(&orig_node
->last_ttvn
) + 1);
3803 batadv_orig_node_free_ref(orig_node
);
3804 return NET_RX_SUCCESS
;
3808 * batadv_tt_init - initialise the translation table internals
3809 * @bat_priv: the bat priv with all the soft interface information
3811 * Return: 0 on success or negative error number in case of failure.
3813 int batadv_tt_init(struct batadv_priv
*bat_priv
)
3817 /* synchronized flags must be remote */
3818 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK
& BATADV_TT_REMOTE_MASK
));
3820 ret
= batadv_tt_local_init(bat_priv
);
3824 ret
= batadv_tt_global_init(bat_priv
);
3828 batadv_tvlv_handler_register(bat_priv
, batadv_tt_tvlv_ogm_handler_v1
,
3829 batadv_tt_tvlv_unicast_handler_v1
,
3830 BATADV_TVLV_TT
, 1, BATADV_NO_FLAGS
);
3832 batadv_tvlv_handler_register(bat_priv
, NULL
,
3833 batadv_roam_tvlv_unicast_handler_v1
,
3834 BATADV_TVLV_ROAM
, 1, BATADV_NO_FLAGS
);
3836 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
3837 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3838 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3844 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3845 * @bat_priv: the bat priv with all the soft interface information
3846 * @addr: the mac address of the client
3847 * @vid: the identifier of the VLAN where this client is connected
3849 * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
3852 bool batadv_tt_global_is_isolated(struct batadv_priv
*bat_priv
,
3853 const u8
*addr
, unsigned short vid
)
3855 struct batadv_tt_global_entry
*tt
;
3858 tt
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3862 ret
= tt
->common
.flags
& BATADV_TT_CLIENT_ISOLA
;
3864 batadv_tt_global_entry_free_ref(tt
);