1 /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #include "translation-table.h"
20 #include "soft-interface.h"
21 #include "hard-interface.h"
24 #include "originator.h"
26 #include "bridge_loop_avoidance.h"
27 #include "multicast.h"
29 #include <linux/crc32c.h>
32 static struct lock_class_key batadv_tt_local_hash_lock_class_key
;
33 static struct lock_class_key batadv_tt_global_hash_lock_class_key
;
35 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
37 struct batadv_orig_node
*orig_node
);
38 static void batadv_tt_purge(struct work_struct
*work
);
40 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
);
41 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
42 struct batadv_orig_node
*orig_node
,
43 const unsigned char *addr
,
44 unsigned short vid
, const char *message
,
47 /* returns 1 if they are the same mac addr */
48 static int batadv_compare_tt(const struct hlist_node
*node
, const void *data2
)
50 const void *data1
= container_of(node
, struct batadv_tt_common_entry
,
53 return batadv_compare_eth(data1
, data2
);
57 * batadv_choose_tt - return the index of the tt entry in the hash table
58 * @data: pointer to the tt_common_entry object to map
59 * @size: the size of the hash table
61 * Returns the hash index where the object represented by 'data' should be
64 static inline uint32_t batadv_choose_tt(const void *data
, uint32_t size
)
66 struct batadv_tt_common_entry
*tt
;
69 tt
= (struct batadv_tt_common_entry
*)data
;
70 hash
= batadv_hash_bytes(hash
, &tt
->addr
, ETH_ALEN
);
71 hash
= batadv_hash_bytes(hash
, &tt
->vid
, sizeof(tt
->vid
));
81 * batadv_tt_hash_find - look for a client in the given hash table
82 * @hash: the hash table to search
83 * @addr: the mac address of the client to look for
84 * @vid: VLAN identifier
86 * Returns a pointer to the tt_common struct belonging to the searched client if
87 * found, NULL otherwise.
89 static struct batadv_tt_common_entry
*
90 batadv_tt_hash_find(struct batadv_hashtable
*hash
, const uint8_t *addr
,
93 struct hlist_head
*head
;
94 struct batadv_tt_common_entry to_search
, *tt
, *tt_tmp
= NULL
;
100 ether_addr_copy(to_search
.addr
, addr
);
103 index
= batadv_choose_tt(&to_search
, hash
->size
);
104 head
= &hash
->table
[index
];
107 hlist_for_each_entry_rcu(tt
, head
, hash_entry
) {
108 if (!batadv_compare_eth(tt
, addr
))
114 if (!atomic_inc_not_zero(&tt
->refcount
))
126 * batadv_tt_local_hash_find - search the local table for a given client
127 * @bat_priv: the bat priv with all the soft interface information
128 * @addr: the mac address of the client to look for
129 * @vid: VLAN identifier
131 * Returns a pointer to the corresponding tt_local_entry struct if the client is
132 * found, NULL otherwise.
134 static struct batadv_tt_local_entry
*
135 batadv_tt_local_hash_find(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
138 struct batadv_tt_common_entry
*tt_common_entry
;
139 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
141 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.local_hash
, addr
,
144 tt_local_entry
= container_of(tt_common_entry
,
145 struct batadv_tt_local_entry
,
147 return tt_local_entry
;
151 * batadv_tt_global_hash_find - search the global table for a given client
152 * @bat_priv: the bat priv with all the soft interface information
153 * @addr: the mac address of the client to look for
154 * @vid: VLAN identifier
156 * Returns a pointer to the corresponding tt_global_entry struct if the client
157 * is found, NULL otherwise.
159 static struct batadv_tt_global_entry
*
160 batadv_tt_global_hash_find(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
163 struct batadv_tt_common_entry
*tt_common_entry
;
164 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
166 tt_common_entry
= batadv_tt_hash_find(bat_priv
->tt
.global_hash
, addr
,
169 tt_global_entry
= container_of(tt_common_entry
,
170 struct batadv_tt_global_entry
,
172 return tt_global_entry
;
176 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry
*tt_local_entry
)
178 if (atomic_dec_and_test(&tt_local_entry
->common
.refcount
))
179 kfree_rcu(tt_local_entry
, common
.rcu
);
183 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
184 * tt_global_entry and possibly free it
185 * @tt_global_entry: the object to free
188 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry
*tt_global_entry
)
190 if (atomic_dec_and_test(&tt_global_entry
->common
.refcount
)) {
191 batadv_tt_global_del_orig_list(tt_global_entry
);
192 kfree_rcu(tt_global_entry
, common
.rcu
);
196 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head
*rcu
)
198 struct batadv_tt_orig_list_entry
*orig_entry
;
200 orig_entry
= container_of(rcu
, struct batadv_tt_orig_list_entry
, rcu
);
202 /* We are in an rcu callback here, therefore we cannot use
203 * batadv_orig_node_free_ref() and its call_rcu():
204 * An rcu_barrier() wouldn't wait for that to finish
206 batadv_orig_node_free_ref_now(orig_entry
->orig_node
);
211 * batadv_tt_local_size_mod - change the size by v of the local table identified
213 * @bat_priv: the bat priv with all the soft interface information
214 * @vid: the VLAN identifier of the sub-table to change
215 * @v: the amount to sum to the local table size
217 static void batadv_tt_local_size_mod(struct batadv_priv
*bat_priv
,
218 unsigned short vid
, int v
)
220 struct batadv_softif_vlan
*vlan
;
222 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
226 atomic_add(v
, &vlan
->tt
.num_entries
);
228 batadv_softif_vlan_free_ref(vlan
);
232 * batadv_tt_local_size_inc - increase by one the local table size for the given
234 * @bat_priv: the bat priv with all the soft interface information
235 * @vid: the VLAN identifier
237 static void batadv_tt_local_size_inc(struct batadv_priv
*bat_priv
,
240 batadv_tt_local_size_mod(bat_priv
, vid
, 1);
244 * batadv_tt_local_size_dec - decrease by one the local table size for the given
246 * @bat_priv: the bat priv with all the soft interface information
247 * @vid: the VLAN identifier
249 static void batadv_tt_local_size_dec(struct batadv_priv
*bat_priv
,
252 batadv_tt_local_size_mod(bat_priv
, vid
, -1);
256 * batadv_tt_global_size_mod - change the size by v of the local table
258 * @bat_priv: the bat priv with all the soft interface information
259 * @vid: the VLAN identifier
260 * @v: the amount to sum to the global table size
262 static void batadv_tt_global_size_mod(struct batadv_orig_node
*orig_node
,
263 unsigned short vid
, int v
)
265 struct batadv_orig_node_vlan
*vlan
;
267 vlan
= batadv_orig_node_vlan_new(orig_node
, vid
);
271 if (atomic_add_return(v
, &vlan
->tt
.num_entries
) == 0) {
272 spin_lock_bh(&orig_node
->vlan_list_lock
);
273 list_del_rcu(&vlan
->list
);
274 spin_unlock_bh(&orig_node
->vlan_list_lock
);
275 batadv_orig_node_vlan_free_ref(vlan
);
278 batadv_orig_node_vlan_free_ref(vlan
);
282 * batadv_tt_global_size_inc - increase by one the global table size for the
284 * @orig_node: the originator which global table size has to be decreased
285 * @vid: the vlan identifier
287 static void batadv_tt_global_size_inc(struct batadv_orig_node
*orig_node
,
290 batadv_tt_global_size_mod(orig_node
, vid
, 1);
294 * batadv_tt_global_size_dec - decrease by one the global table size for the
296 * @orig_node: the originator which global table size has to be decreased
297 * @vid: the vlan identifier
299 static void batadv_tt_global_size_dec(struct batadv_orig_node
*orig_node
,
302 batadv_tt_global_size_mod(orig_node
, vid
, -1);
306 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry
*orig_entry
)
308 if (!atomic_dec_and_test(&orig_entry
->refcount
))
311 call_rcu(&orig_entry
->rcu
, batadv_tt_orig_list_entry_free_rcu
);
315 * batadv_tt_local_event - store a local TT event (ADD/DEL)
316 * @bat_priv: the bat priv with all the soft interface information
317 * @tt_local_entry: the TT entry involved in the event
318 * @event_flags: flags to store in the event structure
320 static void batadv_tt_local_event(struct batadv_priv
*bat_priv
,
321 struct batadv_tt_local_entry
*tt_local_entry
,
324 struct batadv_tt_change_node
*tt_change_node
, *entry
, *safe
;
325 struct batadv_tt_common_entry
*common
= &tt_local_entry
->common
;
326 uint8_t flags
= common
->flags
| event_flags
;
327 bool event_removed
= false;
328 bool del_op_requested
, del_op_entry
;
330 tt_change_node
= kmalloc(sizeof(*tt_change_node
), GFP_ATOMIC
);
334 tt_change_node
->change
.flags
= flags
;
335 memset(tt_change_node
->change
.reserved
, 0,
336 sizeof(tt_change_node
->change
.reserved
));
337 ether_addr_copy(tt_change_node
->change
.addr
, common
->addr
);
338 tt_change_node
->change
.vid
= htons(common
->vid
);
340 del_op_requested
= flags
& BATADV_TT_CLIENT_DEL
;
342 /* check for ADD+DEL or DEL+ADD events */
343 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
344 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
346 if (!batadv_compare_eth(entry
->change
.addr
, common
->addr
))
349 /* DEL+ADD in the same orig interval have no effect and can be
350 * removed to avoid silly behaviour on the receiver side. The
351 * other way around (ADD+DEL) can happen in case of roaming of
352 * a client still in the NEW state. Roaming of NEW clients is
353 * now possible due to automatically recognition of "temporary"
356 del_op_entry
= entry
->change
.flags
& BATADV_TT_CLIENT_DEL
;
357 if (!del_op_requested
&& del_op_entry
)
359 if (del_op_requested
&& !del_op_entry
)
362 /* this is a second add in the same originator interval. It
363 * means that flags have been changed: update them!
365 if (!del_op_requested
&& !del_op_entry
)
366 entry
->change
.flags
= flags
;
370 list_del(&entry
->list
);
372 kfree(tt_change_node
);
373 event_removed
= true;
377 /* track the change in the OGMinterval list */
378 list_add_tail(&tt_change_node
->list
, &bat_priv
->tt
.changes_list
);
381 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
384 atomic_dec(&bat_priv
->tt
.local_changes
);
386 atomic_inc(&bat_priv
->tt
.local_changes
);
390 * batadv_tt_len - compute length in bytes of given number of tt changes
391 * @changes_num: number of tt changes
393 * Returns computed length in bytes.
395 static int batadv_tt_len(int changes_num
)
397 return changes_num
* sizeof(struct batadv_tvlv_tt_change
);
401 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
402 * @tt_len: available space
404 * Returns the number of entries.
406 static uint16_t batadv_tt_entries(uint16_t tt_len
)
408 return tt_len
/ batadv_tt_len(1);
412 * batadv_tt_local_table_transmit_size - calculates the local translation table
413 * size when transmitted over the air
414 * @bat_priv: the bat priv with all the soft interface information
416 * Returns local translation table size in bytes.
418 static int batadv_tt_local_table_transmit_size(struct batadv_priv
*bat_priv
)
420 uint16_t num_vlan
= 0, tt_local_entries
= 0;
421 struct batadv_softif_vlan
*vlan
;
425 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
427 tt_local_entries
+= atomic_read(&vlan
->tt
.num_entries
);
431 /* header size of tvlv encapsulated tt response payload */
432 hdr_size
= sizeof(struct batadv_unicast_tvlv_packet
);
433 hdr_size
+= sizeof(struct batadv_tvlv_hdr
);
434 hdr_size
+= sizeof(struct batadv_tvlv_tt_data
);
435 hdr_size
+= num_vlan
* sizeof(struct batadv_tvlv_tt_vlan_data
);
437 return hdr_size
+ batadv_tt_len(tt_local_entries
);
440 static int batadv_tt_local_init(struct batadv_priv
*bat_priv
)
442 if (bat_priv
->tt
.local_hash
)
445 bat_priv
->tt
.local_hash
= batadv_hash_new(1024);
447 if (!bat_priv
->tt
.local_hash
)
450 batadv_hash_set_lock_class(bat_priv
->tt
.local_hash
,
451 &batadv_tt_local_hash_lock_class_key
);
456 static void batadv_tt_global_free(struct batadv_priv
*bat_priv
,
457 struct batadv_tt_global_entry
*tt_global
,
460 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
461 "Deleting global tt entry %pM (vid: %d): %s\n",
462 tt_global
->common
.addr
,
463 BATADV_PRINT_VID(tt_global
->common
.vid
), message
);
465 batadv_hash_remove(bat_priv
->tt
.global_hash
, batadv_compare_tt
,
466 batadv_choose_tt
, &tt_global
->common
);
467 batadv_tt_global_entry_free_ref(tt_global
);
471 * batadv_tt_local_add - add a new client to the local table or update an
473 * @soft_iface: netdev struct of the mesh interface
474 * @addr: the mac address of the client to add
475 * @vid: VLAN identifier
476 * @ifindex: index of the interface where the client is connected to (useful to
477 * identify wireless clients)
478 * @mark: the value contained in the skb->mark field of the received packet (if
481 * Returns true if the client was successfully added, false otherwise.
483 bool batadv_tt_local_add(struct net_device
*soft_iface
, const uint8_t *addr
,
484 unsigned short vid
, int ifindex
, uint32_t mark
)
486 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
487 struct batadv_tt_local_entry
*tt_local
;
488 struct batadv_tt_global_entry
*tt_global
= NULL
;
489 struct net_device
*in_dev
= NULL
;
490 struct hlist_head
*head
;
491 struct batadv_tt_orig_list_entry
*orig_entry
;
492 int hash_added
, table_size
, packet_size_max
;
493 bool ret
= false, roamed_back
= false;
494 uint8_t remote_flags
;
497 if (ifindex
!= BATADV_NULL_IFINDEX
)
498 in_dev
= dev_get_by_index(&init_net
, ifindex
);
500 tt_local
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
502 if (!is_multicast_ether_addr(addr
))
503 tt_global
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
506 tt_local
->last_seen
= jiffies
;
507 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_PENDING
) {
508 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
509 "Re-adding pending client %pM (vid: %d)\n",
510 addr
, BATADV_PRINT_VID(vid
));
511 /* whatever the reason why the PENDING flag was set,
512 * this is a client which was enqueued to be removed in
513 * this orig_interval. Since it popped up again, the
514 * flag can be reset like it was never enqueued
516 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_PENDING
;
520 if (tt_local
->common
.flags
& BATADV_TT_CLIENT_ROAM
) {
521 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
522 "Roaming client %pM (vid: %d) came back to its original location\n",
523 addr
, BATADV_PRINT_VID(vid
));
524 /* the ROAM flag is set because this client roamed away
525 * and the node got a roaming_advertisement message. Now
526 * that the client popped up again at its original
527 * location such flag can be unset
529 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
535 /* Ignore the client if we cannot send it in a full table response. */
536 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
537 table_size
+= batadv_tt_len(1);
538 packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
539 if (table_size
> packet_size_max
) {
540 net_ratelimited_function(batadv_info
, soft_iface
,
541 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
542 table_size
, packet_size_max
, addr
);
546 tt_local
= kmalloc(sizeof(*tt_local
), GFP_ATOMIC
);
550 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
551 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
552 addr
, BATADV_PRINT_VID(vid
),
553 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
555 ether_addr_copy(tt_local
->common
.addr
, addr
);
556 /* The local entry has to be marked as NEW to avoid to send it in
557 * a full table response going out before the next ttvn increment
558 * (consistency check)
560 tt_local
->common
.flags
= BATADV_TT_CLIENT_NEW
;
561 tt_local
->common
.vid
= vid
;
562 if (batadv_is_wifi_netdev(in_dev
))
563 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
564 atomic_set(&tt_local
->common
.refcount
, 2);
565 tt_local
->last_seen
= jiffies
;
566 tt_local
->common
.added_at
= tt_local
->last_seen
;
568 /* the batman interface mac and multicast addresses should never be
571 if (batadv_compare_eth(addr
, soft_iface
->dev_addr
) ||
572 is_multicast_ether_addr(addr
))
573 tt_local
->common
.flags
|= BATADV_TT_CLIENT_NOPURGE
;
575 hash_added
= batadv_hash_add(bat_priv
->tt
.local_hash
, batadv_compare_tt
,
576 batadv_choose_tt
, &tt_local
->common
,
577 &tt_local
->common
.hash_entry
);
579 if (unlikely(hash_added
!= 0)) {
580 /* remove the reference for the hash */
581 batadv_tt_local_entry_free_ref(tt_local
);
586 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
589 /* Check whether it is a roaming, but don't do anything if the roaming
590 * process has already been handled
592 if (tt_global
&& !(tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
)) {
593 /* These node are probably going to update their tt table */
594 head
= &tt_global
->orig_list
;
596 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
597 batadv_send_roam_adv(bat_priv
, tt_global
->common
.addr
,
598 tt_global
->common
.vid
,
599 orig_entry
->orig_node
);
603 batadv_tt_global_free(bat_priv
, tt_global
,
607 /* The global entry has to be marked as ROAMING and
608 * has to be kept for consistency purpose
610 tt_global
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
611 tt_global
->roam_at
= jiffies
;
615 /* store the current remote flags before altering them. This helps
616 * understanding is flags are changing or not
618 remote_flags
= tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
;
620 if (batadv_is_wifi_netdev(in_dev
))
621 tt_local
->common
.flags
|= BATADV_TT_CLIENT_WIFI
;
623 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_WIFI
;
625 /* check the mark in the skb: if it's equal to the configured
626 * isolation_mark, it means the packet is coming from an isolated
629 match_mark
= (mark
& bat_priv
->isolation_mark_mask
);
630 if (bat_priv
->isolation_mark_mask
&&
631 match_mark
== bat_priv
->isolation_mark
)
632 tt_local
->common
.flags
|= BATADV_TT_CLIENT_ISOLA
;
634 tt_local
->common
.flags
&= ~BATADV_TT_CLIENT_ISOLA
;
636 /* if any "dynamic" flag has been modified, resend an ADD event for this
637 * entry so that all the nodes can get the new flags
639 if (remote_flags
^ (tt_local
->common
.flags
& BATADV_TT_REMOTE_MASK
))
640 batadv_tt_local_event(bat_priv
, tt_local
, BATADV_NO_FLAGS
);
647 batadv_tt_local_entry_free_ref(tt_local
);
649 batadv_tt_global_entry_free_ref(tt_global
);
654 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
655 * within a TT Response directed to another node
656 * @orig_node: originator for which the TT data has to be prepared
657 * @tt_data: uninitialised pointer to the address of the TVLV buffer
658 * @tt_change: uninitialised pointer to the address of the area where the TT
659 * changed can be stored
660 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
661 * function reserves the amount of space needed to send the entire global TT
662 * table. In case of success the value is updated with the real amount of
665 * Allocate the needed amount of memory for the entire TT TVLV and write its
666 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
667 * objects, one per active VLAN served by the originator node.
669 * Return the size of the allocated buffer or 0 in case of failure.
672 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node
*orig_node
,
673 struct batadv_tvlv_tt_data
**tt_data
,
674 struct batadv_tvlv_tt_change
**tt_change
,
677 uint16_t num_vlan
= 0, num_entries
= 0, change_offset
, tvlv_len
;
678 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
679 struct batadv_orig_node_vlan
*vlan
;
680 uint8_t *tt_change_ptr
;
683 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
685 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
688 change_offset
= sizeof(**tt_data
);
689 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
691 /* if tt_len is negative, allocate the space needed by the full table */
693 *tt_len
= batadv_tt_len(num_entries
);
696 tvlv_len
+= change_offset
;
698 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
704 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
705 (*tt_data
)->ttvn
= atomic_read(&orig_node
->last_ttvn
);
706 (*tt_data
)->num_vlan
= htons(num_vlan
);
708 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
709 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
710 tt_vlan
->vid
= htons(vlan
->vid
);
711 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
716 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
717 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
725 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
727 * @bat_priv: the bat priv with all the soft interface information
728 * @tt_data: uninitialised pointer to the address of the TVLV buffer
729 * @tt_change: uninitialised pointer to the address of the area where the TT
730 * changes can be stored
731 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
732 * function reserves the amount of space needed to send the entire local TT
733 * table. In case of success the value is updated with the real amount of
736 * Allocate the needed amount of memory for the entire TT TVLV and write its
737 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
738 * objects, one per active VLAN.
740 * Return the size of the allocated buffer or 0 in case of failure.
743 batadv_tt_prepare_tvlv_local_data(struct batadv_priv
*bat_priv
,
744 struct batadv_tvlv_tt_data
**tt_data
,
745 struct batadv_tvlv_tt_change
**tt_change
,
748 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
749 struct batadv_softif_vlan
*vlan
;
750 uint16_t num_vlan
= 0, num_entries
= 0, tvlv_len
;
751 uint8_t *tt_change_ptr
;
755 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
757 num_entries
+= atomic_read(&vlan
->tt
.num_entries
);
760 change_offset
= sizeof(**tt_data
);
761 change_offset
+= num_vlan
* sizeof(*tt_vlan
);
763 /* if tt_len is negative, allocate the space needed by the full table */
765 *tt_len
= batadv_tt_len(num_entries
);
768 tvlv_len
+= change_offset
;
770 *tt_data
= kmalloc(tvlv_len
, GFP_ATOMIC
);
776 (*tt_data
)->flags
= BATADV_NO_FLAGS
;
777 (*tt_data
)->ttvn
= atomic_read(&bat_priv
->tt
.vn
);
778 (*tt_data
)->num_vlan
= htons(num_vlan
);
780 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(*tt_data
+ 1);
781 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
782 tt_vlan
->vid
= htons(vlan
->vid
);
783 tt_vlan
->crc
= htonl(vlan
->tt
.crc
);
788 tt_change_ptr
= (uint8_t *)*tt_data
+ change_offset
;
789 *tt_change
= (struct batadv_tvlv_tt_change
*)tt_change_ptr
;
797 * batadv_tt_tvlv_container_update - update the translation table tvlv container
798 * after local tt changes have been committed
799 * @bat_priv: the bat priv with all the soft interface information
801 static void batadv_tt_tvlv_container_update(struct batadv_priv
*bat_priv
)
803 struct batadv_tt_change_node
*entry
, *safe
;
804 struct batadv_tvlv_tt_data
*tt_data
;
805 struct batadv_tvlv_tt_change
*tt_change
;
806 int tt_diff_len
, tt_change_len
= 0;
807 int tt_diff_entries_num
= 0, tt_diff_entries_count
= 0;
810 tt_diff_entries_num
= atomic_read(&bat_priv
->tt
.local_changes
);
811 tt_diff_len
= batadv_tt_len(tt_diff_entries_num
);
813 /* if we have too many changes for one packet don't send any
814 * and wait for the tt table request which will be fragmented
816 if (tt_diff_len
> bat_priv
->soft_iface
->mtu
)
819 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
, &tt_data
,
820 &tt_change
, &tt_diff_len
);
824 tt_data
->flags
= BATADV_TT_OGM_DIFF
;
826 if (tt_diff_len
== 0)
827 goto container_register
;
829 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
830 atomic_set(&bat_priv
->tt
.local_changes
, 0);
832 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
834 if (tt_diff_entries_count
< tt_diff_entries_num
) {
835 memcpy(tt_change
+ tt_diff_entries_count
,
837 sizeof(struct batadv_tvlv_tt_change
));
838 tt_diff_entries_count
++;
840 list_del(&entry
->list
);
843 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
845 /* Keep the buffer for possible tt_request */
846 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
847 kfree(bat_priv
->tt
.last_changeset
);
848 bat_priv
->tt
.last_changeset_len
= 0;
849 bat_priv
->tt
.last_changeset
= NULL
;
850 tt_change_len
= batadv_tt_len(tt_diff_entries_count
);
851 /* check whether this new OGM has no changes due to size problems */
852 if (tt_diff_entries_count
> 0) {
853 /* if kmalloc() fails we will reply with the full table
854 * instead of providing the diff
856 bat_priv
->tt
.last_changeset
= kzalloc(tt_diff_len
, GFP_ATOMIC
);
857 if (bat_priv
->tt
.last_changeset
) {
858 memcpy(bat_priv
->tt
.last_changeset
,
859 tt_change
, tt_change_len
);
860 bat_priv
->tt
.last_changeset_len
= tt_diff_len
;
863 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
866 batadv_tvlv_container_register(bat_priv
, BATADV_TVLV_TT
, 1, tt_data
,
871 int batadv_tt_local_seq_print_text(struct seq_file
*seq
, void *offset
)
873 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
874 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
875 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
876 struct batadv_tt_common_entry
*tt_common_entry
;
877 struct batadv_tt_local_entry
*tt_local
;
878 struct batadv_hard_iface
*primary_if
;
879 struct batadv_softif_vlan
*vlan
;
880 struct hlist_head
*head
;
885 unsigned long last_seen_jiffies
;
887 uint16_t np_flag
= BATADV_TT_CLIENT_NOPURGE
;
889 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
894 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
895 net_dev
->name
, (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
896 seq_printf(seq
, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
897 "Flags", "Last seen", "CRC");
899 for (i
= 0; i
< hash
->size
; i
++) {
900 head
= &hash
->table
[i
];
903 hlist_for_each_entry_rcu(tt_common_entry
,
905 tt_local
= container_of(tt_common_entry
,
906 struct batadv_tt_local_entry
,
908 vid
= tt_common_entry
->vid
;
909 last_seen_jiffies
= jiffies
- tt_local
->last_seen
;
910 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
911 last_seen_secs
= last_seen_msecs
/ 1000;
912 last_seen_msecs
= last_seen_msecs
% 1000;
914 no_purge
= tt_common_entry
->flags
& np_flag
;
916 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
918 seq_printf(seq
, "Cannot retrieve VLAN %d\n",
919 BATADV_PRINT_VID(vid
));
924 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
925 tt_common_entry
->addr
,
926 BATADV_PRINT_VID(tt_common_entry
->vid
),
927 (tt_common_entry
->flags
&
928 BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
929 no_purge
? 'P' : '.',
930 (tt_common_entry
->flags
&
931 BATADV_TT_CLIENT_NEW
? 'N' : '.'),
932 (tt_common_entry
->flags
&
933 BATADV_TT_CLIENT_PENDING
? 'X' : '.'),
934 (tt_common_entry
->flags
&
935 BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
936 (tt_common_entry
->flags
&
937 BATADV_TT_CLIENT_ISOLA
? 'I' : '.'),
938 no_purge
? 0 : last_seen_secs
,
939 no_purge
? 0 : last_seen_msecs
,
942 batadv_softif_vlan_free_ref(vlan
);
948 batadv_hardif_free_ref(primary_if
);
953 batadv_tt_local_set_pending(struct batadv_priv
*bat_priv
,
954 struct batadv_tt_local_entry
*tt_local_entry
,
955 uint16_t flags
, const char *message
)
957 batadv_tt_local_event(bat_priv
, tt_local_entry
, flags
);
959 /* The local client has to be marked as "pending to be removed" but has
960 * to be kept in the table in order to send it in a full table
961 * response issued before the net ttvn increment (consistency check)
963 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_PENDING
;
965 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
966 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
967 tt_local_entry
->common
.addr
,
968 BATADV_PRINT_VID(tt_local_entry
->common
.vid
), message
);
972 * batadv_tt_local_remove - logically remove an entry from the local table
973 * @bat_priv: the bat priv with all the soft interface information
974 * @addr: the MAC address of the client to remove
975 * @vid: VLAN identifier
976 * @message: message to append to the log on deletion
977 * @roaming: true if the deletion is due to a roaming event
979 * Returns the flags assigned to the local entry before being deleted
981 uint16_t batadv_tt_local_remove(struct batadv_priv
*bat_priv
,
982 const uint8_t *addr
, unsigned short vid
,
983 const char *message
, bool roaming
)
985 struct batadv_tt_local_entry
*tt_local_entry
;
986 uint16_t flags
, curr_flags
= BATADV_NO_FLAGS
;
988 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
992 curr_flags
= tt_local_entry
->common
.flags
;
994 flags
= BATADV_TT_CLIENT_DEL
;
995 /* if this global entry addition is due to a roaming, the node has to
996 * mark the local entry as "roamed" in order to correctly reroute
1000 flags
|= BATADV_TT_CLIENT_ROAM
;
1001 /* mark the local client as ROAMed */
1002 tt_local_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1005 if (!(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
)) {
1006 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
, flags
,
1010 /* if this client has been added right now, it is possible to
1011 * immediately purge it
1013 batadv_tt_local_event(bat_priv
, tt_local_entry
, BATADV_TT_CLIENT_DEL
);
1014 hlist_del_rcu(&tt_local_entry
->common
.hash_entry
);
1015 batadv_tt_local_entry_free_ref(tt_local_entry
);
1019 batadv_tt_local_entry_free_ref(tt_local_entry
);
1025 * batadv_tt_local_purge_list - purge inactive tt local entries
1026 * @bat_priv: the bat priv with all the soft interface information
1027 * @head: pointer to the list containing the local tt entries
1028 * @timeout: parameter deciding whether a given tt local entry is considered
1031 static void batadv_tt_local_purge_list(struct batadv_priv
*bat_priv
,
1032 struct hlist_head
*head
,
1035 struct batadv_tt_local_entry
*tt_local_entry
;
1036 struct batadv_tt_common_entry
*tt_common_entry
;
1037 struct hlist_node
*node_tmp
;
1039 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
, head
,
1041 tt_local_entry
= container_of(tt_common_entry
,
1042 struct batadv_tt_local_entry
,
1044 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NOPURGE
)
1047 /* entry already marked for deletion */
1048 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
)
1051 if (!batadv_has_timed_out(tt_local_entry
->last_seen
, timeout
))
1054 batadv_tt_local_set_pending(bat_priv
, tt_local_entry
,
1055 BATADV_TT_CLIENT_DEL
, "timed out");
1060 * batadv_tt_local_purge - purge inactive tt local entries
1061 * @bat_priv: the bat priv with all the soft interface information
1062 * @timeout: parameter deciding whether a given tt local entry is considered
1065 static void batadv_tt_local_purge(struct batadv_priv
*bat_priv
,
1068 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
1069 struct hlist_head
*head
;
1070 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1073 for (i
= 0; i
< hash
->size
; i
++) {
1074 head
= &hash
->table
[i
];
1075 list_lock
= &hash
->list_locks
[i
];
1077 spin_lock_bh(list_lock
);
1078 batadv_tt_local_purge_list(bat_priv
, head
, timeout
);
1079 spin_unlock_bh(list_lock
);
1083 static void batadv_tt_local_table_free(struct batadv_priv
*bat_priv
)
1085 struct batadv_hashtable
*hash
;
1086 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1087 struct batadv_tt_common_entry
*tt_common_entry
;
1088 struct batadv_tt_local_entry
*tt_local
;
1089 struct hlist_node
*node_tmp
;
1090 struct hlist_head
*head
;
1093 if (!bat_priv
->tt
.local_hash
)
1096 hash
= bat_priv
->tt
.local_hash
;
1098 for (i
= 0; i
< hash
->size
; i
++) {
1099 head
= &hash
->table
[i
];
1100 list_lock
= &hash
->list_locks
[i
];
1102 spin_lock_bh(list_lock
);
1103 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1105 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1106 tt_local
= container_of(tt_common_entry
,
1107 struct batadv_tt_local_entry
,
1109 batadv_tt_local_entry_free_ref(tt_local
);
1111 spin_unlock_bh(list_lock
);
1114 batadv_hash_destroy(hash
);
1116 bat_priv
->tt
.local_hash
= NULL
;
1119 static int batadv_tt_global_init(struct batadv_priv
*bat_priv
)
1121 if (bat_priv
->tt
.global_hash
)
1124 bat_priv
->tt
.global_hash
= batadv_hash_new(1024);
1126 if (!bat_priv
->tt
.global_hash
)
1129 batadv_hash_set_lock_class(bat_priv
->tt
.global_hash
,
1130 &batadv_tt_global_hash_lock_class_key
);
1135 static void batadv_tt_changes_list_free(struct batadv_priv
*bat_priv
)
1137 struct batadv_tt_change_node
*entry
, *safe
;
1139 spin_lock_bh(&bat_priv
->tt
.changes_list_lock
);
1141 list_for_each_entry_safe(entry
, safe
, &bat_priv
->tt
.changes_list
,
1143 list_del(&entry
->list
);
1147 atomic_set(&bat_priv
->tt
.local_changes
, 0);
1148 spin_unlock_bh(&bat_priv
->tt
.changes_list_lock
);
1151 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1152 * batadv_tt_global_entry list
1154 * returns it with an increased refcounter, NULL if not found
1156 static struct batadv_tt_orig_list_entry
*
1157 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry
*entry
,
1158 const struct batadv_orig_node
*orig_node
)
1160 struct batadv_tt_orig_list_entry
*tmp_orig_entry
, *orig_entry
= NULL
;
1161 const struct hlist_head
*head
;
1164 head
= &entry
->orig_list
;
1165 hlist_for_each_entry_rcu(tmp_orig_entry
, head
, list
) {
1166 if (tmp_orig_entry
->orig_node
!= orig_node
)
1168 if (!atomic_inc_not_zero(&tmp_orig_entry
->refcount
))
1171 orig_entry
= tmp_orig_entry
;
1179 /* find out if an orig_node is already in the list of a tt_global_entry.
1180 * returns true if found, false otherwise
1183 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry
*entry
,
1184 const struct batadv_orig_node
*orig_node
)
1186 struct batadv_tt_orig_list_entry
*orig_entry
;
1189 orig_entry
= batadv_tt_global_orig_entry_find(entry
, orig_node
);
1192 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1199 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry
*tt_global
,
1200 struct batadv_orig_node
*orig_node
, int ttvn
)
1202 struct batadv_tt_orig_list_entry
*orig_entry
;
1204 orig_entry
= batadv_tt_global_orig_entry_find(tt_global
, orig_node
);
1206 /* refresh the ttvn: the current value could be a bogus one that
1207 * was added during a "temporary client detection"
1209 orig_entry
->ttvn
= ttvn
;
1213 orig_entry
= kzalloc(sizeof(*orig_entry
), GFP_ATOMIC
);
1217 INIT_HLIST_NODE(&orig_entry
->list
);
1218 atomic_inc(&orig_node
->refcount
);
1219 batadv_tt_global_size_inc(orig_node
, tt_global
->common
.vid
);
1220 orig_entry
->orig_node
= orig_node
;
1221 orig_entry
->ttvn
= ttvn
;
1222 atomic_set(&orig_entry
->refcount
, 2);
1224 spin_lock_bh(&tt_global
->list_lock
);
1225 hlist_add_head_rcu(&orig_entry
->list
,
1226 &tt_global
->orig_list
);
1227 spin_unlock_bh(&tt_global
->list_lock
);
1230 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1234 * batadv_tt_global_add - add a new TT global entry or update an existing one
1235 * @bat_priv: the bat priv with all the soft interface information
1236 * @orig_node: the originator announcing the client
1237 * @tt_addr: the mac address of the non-mesh client
1238 * @vid: VLAN identifier
1239 * @flags: TT flags that have to be set for this non-mesh client
1240 * @ttvn: the tt version number ever announcing this non-mesh client
1242 * Add a new TT global entry for the given originator. If the entry already
1243 * exists add a new reference to the given originator (a global entry can have
1244 * references to multiple originators) and adjust the flags attribute to reflect
1245 * the function argument.
1246 * If a TT local entry exists for this non-mesh client remove it.
1248 * The caller must hold orig_node refcount.
1250 * Return true if the new entry has been added, false otherwise
1252 static bool batadv_tt_global_add(struct batadv_priv
*bat_priv
,
1253 struct batadv_orig_node
*orig_node
,
1254 const unsigned char *tt_addr
,
1255 unsigned short vid
, uint16_t flags
,
1258 struct batadv_tt_global_entry
*tt_global_entry
;
1259 struct batadv_tt_local_entry
*tt_local_entry
;
1262 struct batadv_tt_common_entry
*common
;
1263 uint16_t local_flags
;
1265 /* ignore global entries from backbone nodes */
1266 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
, vid
))
1269 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, tt_addr
, vid
);
1270 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, tt_addr
, vid
);
1272 /* if the node already has a local client for this entry, it has to wait
1273 * for a roaming advertisement instead of manually messing up the global
1276 if ((flags
& BATADV_TT_CLIENT_TEMP
) && tt_local_entry
&&
1277 !(tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_NEW
))
1280 if (!tt_global_entry
) {
1281 tt_global_entry
= kzalloc(sizeof(*tt_global_entry
), GFP_ATOMIC
);
1282 if (!tt_global_entry
)
1285 common
= &tt_global_entry
->common
;
1286 ether_addr_copy(common
->addr
, tt_addr
);
1289 common
->flags
= flags
;
1290 tt_global_entry
->roam_at
= 0;
1291 /* node must store current time in case of roaming. This is
1292 * needed to purge this entry out on timeout (if nobody claims
1295 if (flags
& BATADV_TT_CLIENT_ROAM
)
1296 tt_global_entry
->roam_at
= jiffies
;
1297 atomic_set(&common
->refcount
, 2);
1298 common
->added_at
= jiffies
;
1300 INIT_HLIST_HEAD(&tt_global_entry
->orig_list
);
1301 spin_lock_init(&tt_global_entry
->list_lock
);
1303 hash_added
= batadv_hash_add(bat_priv
->tt
.global_hash
,
1305 batadv_choose_tt
, common
,
1306 &common
->hash_entry
);
1308 if (unlikely(hash_added
!= 0)) {
1309 /* remove the reference for the hash */
1310 batadv_tt_global_entry_free_ref(tt_global_entry
);
1314 common
= &tt_global_entry
->common
;
1315 /* If there is already a global entry, we can use this one for
1317 * But if we are trying to add a temporary client then here are
1318 * two options at this point:
1319 * 1) the global client is not a temporary client: the global
1320 * client has to be left as it is, temporary information
1321 * should never override any already known client state
1322 * 2) the global client is a temporary client: purge the
1323 * originator list and add the new one orig_entry
1325 if (flags
& BATADV_TT_CLIENT_TEMP
) {
1326 if (!(common
->flags
& BATADV_TT_CLIENT_TEMP
))
1328 if (batadv_tt_global_entry_has_orig(tt_global_entry
,
1331 batadv_tt_global_del_orig_list(tt_global_entry
);
1332 goto add_orig_entry
;
1335 /* if the client was temporary added before receiving the first
1336 * OGM announcing it, we have to clear the TEMP flag
1338 common
->flags
&= ~BATADV_TT_CLIENT_TEMP
;
1340 /* the change can carry possible "attribute" flags like the
1341 * TT_CLIENT_WIFI, therefore they have to be copied in the
1344 tt_global_entry
->common
.flags
|= flags
;
1346 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1347 * one originator left in the list and we previously received a
1348 * delete + roaming change for this originator.
1350 * We should first delete the old originator before adding the
1353 if (common
->flags
& BATADV_TT_CLIENT_ROAM
) {
1354 batadv_tt_global_del_orig_list(tt_global_entry
);
1355 common
->flags
&= ~BATADV_TT_CLIENT_ROAM
;
1356 tt_global_entry
->roam_at
= 0;
1360 /* add the new orig_entry (if needed) or update it */
1361 batadv_tt_global_orig_entry_add(tt_global_entry
, orig_node
, ttvn
);
1363 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1364 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1365 common
->addr
, BATADV_PRINT_VID(common
->vid
),
1370 /* Do not remove multicast addresses from the local hash on
1373 if (is_multicast_ether_addr(tt_addr
))
1376 /* remove address from local hash if present */
1377 local_flags
= batadv_tt_local_remove(bat_priv
, tt_addr
, vid
,
1378 "global tt received",
1379 flags
& BATADV_TT_CLIENT_ROAM
);
1380 tt_global_entry
->common
.flags
|= local_flags
& BATADV_TT_CLIENT_WIFI
;
1382 if (!(flags
& BATADV_TT_CLIENT_ROAM
))
1383 /* this is a normal global add. Therefore the client is not in a
1384 * roaming state anymore.
1386 tt_global_entry
->common
.flags
&= ~BATADV_TT_CLIENT_ROAM
;
1389 if (tt_global_entry
)
1390 batadv_tt_global_entry_free_ref(tt_global_entry
);
1392 batadv_tt_local_entry_free_ref(tt_local_entry
);
1397 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1398 * @bat_priv: the bat priv with all the soft interface information
1399 * @tt_global_entry: global translation table entry to be analyzed
1401 * This functon assumes the caller holds rcu_read_lock().
1402 * Returns best originator list entry or NULL on errors.
1404 static struct batadv_tt_orig_list_entry
*
1405 batadv_transtable_best_orig(struct batadv_priv
*bat_priv
,
1406 struct batadv_tt_global_entry
*tt_global_entry
)
1408 struct batadv_neigh_node
*router
, *best_router
= NULL
;
1409 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
1410 struct hlist_head
*head
;
1411 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
= NULL
;
1413 head
= &tt_global_entry
->orig_list
;
1414 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1415 router
= batadv_orig_router_get(orig_entry
->orig_node
,
1421 bao
->bat_neigh_cmp(router
, BATADV_IF_DEFAULT
,
1422 best_router
, BATADV_IF_DEFAULT
) <= 0) {
1423 batadv_neigh_node_free_ref(router
);
1427 /* release the refcount for the "old" best */
1429 batadv_neigh_node_free_ref(best_router
);
1431 best_entry
= orig_entry
;
1432 best_router
= router
;
1436 batadv_neigh_node_free_ref(best_router
);
1442 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1443 * for this global entry
1444 * @bat_priv: the bat priv with all the soft interface information
1445 * @tt_global_entry: global translation table entry to be printed
1446 * @seq: debugfs table seq_file struct
1448 * This functon assumes the caller holds rcu_read_lock().
1451 batadv_tt_global_print_entry(struct batadv_priv
*bat_priv
,
1452 struct batadv_tt_global_entry
*tt_global_entry
,
1453 struct seq_file
*seq
)
1455 struct batadv_tt_orig_list_entry
*orig_entry
, *best_entry
;
1456 struct batadv_tt_common_entry
*tt_common_entry
;
1457 struct batadv_orig_node_vlan
*vlan
;
1458 struct hlist_head
*head
;
1462 tt_common_entry
= &tt_global_entry
->common
;
1463 flags
= tt_common_entry
->flags
;
1465 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1467 vlan
= batadv_orig_node_vlan_get(best_entry
->orig_node
,
1468 tt_common_entry
->vid
);
1471 " * Cannot retrieve VLAN %d for originator %pM\n",
1472 BATADV_PRINT_VID(tt_common_entry
->vid
),
1473 best_entry
->orig_node
->orig
);
1477 last_ttvn
= atomic_read(&best_entry
->orig_node
->last_ttvn
);
1479 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1480 '*', tt_global_entry
->common
.addr
,
1481 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1482 best_entry
->ttvn
, best_entry
->orig_node
->orig
,
1483 last_ttvn
, vlan
->tt
.crc
,
1484 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1485 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1486 (flags
& BATADV_TT_CLIENT_ISOLA
? 'I' : '.'),
1487 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1489 batadv_orig_node_vlan_free_ref(vlan
);
1493 head
= &tt_global_entry
->orig_list
;
1495 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1496 if (best_entry
== orig_entry
)
1499 vlan
= batadv_orig_node_vlan_get(orig_entry
->orig_node
,
1500 tt_common_entry
->vid
);
1503 " + Cannot retrieve VLAN %d for originator %pM\n",
1504 BATADV_PRINT_VID(tt_common_entry
->vid
),
1505 orig_entry
->orig_node
->orig
);
1509 last_ttvn
= atomic_read(&orig_entry
->orig_node
->last_ttvn
);
1511 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1512 '+', tt_global_entry
->common
.addr
,
1513 BATADV_PRINT_VID(tt_global_entry
->common
.vid
),
1514 orig_entry
->ttvn
, orig_entry
->orig_node
->orig
,
1515 last_ttvn
, vlan
->tt
.crc
,
1516 (flags
& BATADV_TT_CLIENT_ROAM
? 'R' : '.'),
1517 (flags
& BATADV_TT_CLIENT_WIFI
? 'W' : '.'),
1518 (flags
& BATADV_TT_CLIENT_ISOLA
? 'I' : '.'),
1519 (flags
& BATADV_TT_CLIENT_TEMP
? 'T' : '.'));
1521 batadv_orig_node_vlan_free_ref(vlan
);
1525 int batadv_tt_global_seq_print_text(struct seq_file
*seq
, void *offset
)
1527 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1528 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1529 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1530 struct batadv_tt_common_entry
*tt_common_entry
;
1531 struct batadv_tt_global_entry
*tt_global
;
1532 struct batadv_hard_iface
*primary_if
;
1533 struct hlist_head
*head
;
1536 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1541 "Globally announced TT entries received via the mesh %s\n",
1543 seq_printf(seq
, " %-13s %s %s %-15s %s (%-10s) %s\n",
1544 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1547 for (i
= 0; i
< hash
->size
; i
++) {
1548 head
= &hash
->table
[i
];
1551 hlist_for_each_entry_rcu(tt_common_entry
,
1553 tt_global
= container_of(tt_common_entry
,
1554 struct batadv_tt_global_entry
,
1556 batadv_tt_global_print_entry(bat_priv
, tt_global
, seq
);
1562 batadv_hardif_free_ref(primary_if
);
1566 /* deletes the orig list of a tt_global_entry */
1568 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry
*tt_global_entry
)
1570 struct hlist_head
*head
;
1571 struct hlist_node
*safe
;
1572 struct batadv_tt_orig_list_entry
*orig_entry
;
1574 spin_lock_bh(&tt_global_entry
->list_lock
);
1575 head
= &tt_global_entry
->orig_list
;
1576 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1577 hlist_del_rcu(&orig_entry
->list
);
1578 batadv_tt_global_size_dec(orig_entry
->orig_node
,
1579 tt_global_entry
->common
.vid
);
1580 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1582 spin_unlock_bh(&tt_global_entry
->list_lock
);
1586 batadv_tt_global_del_orig_entry(struct batadv_priv
*bat_priv
,
1587 struct batadv_tt_global_entry
*tt_global_entry
,
1588 struct batadv_orig_node
*orig_node
,
1589 const char *message
)
1591 struct hlist_head
*head
;
1592 struct hlist_node
*safe
;
1593 struct batadv_tt_orig_list_entry
*orig_entry
;
1596 spin_lock_bh(&tt_global_entry
->list_lock
);
1597 head
= &tt_global_entry
->orig_list
;
1598 hlist_for_each_entry_safe(orig_entry
, safe
, head
, list
) {
1599 if (orig_entry
->orig_node
== orig_node
) {
1600 vid
= tt_global_entry
->common
.vid
;
1601 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1602 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1604 tt_global_entry
->common
.addr
,
1605 BATADV_PRINT_VID(vid
), message
);
1606 hlist_del_rcu(&orig_entry
->list
);
1607 batadv_tt_global_size_dec(orig_node
,
1608 tt_global_entry
->common
.vid
);
1609 batadv_tt_orig_list_entry_free_ref(orig_entry
);
1612 spin_unlock_bh(&tt_global_entry
->list_lock
);
1615 /* If the client is to be deleted, we check if it is the last origantor entry
1616 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1617 * timer, otherwise we simply remove the originator scheduled for deletion.
1620 batadv_tt_global_del_roaming(struct batadv_priv
*bat_priv
,
1621 struct batadv_tt_global_entry
*tt_global_entry
,
1622 struct batadv_orig_node
*orig_node
,
1623 const char *message
)
1625 bool last_entry
= true;
1626 struct hlist_head
*head
;
1627 struct batadv_tt_orig_list_entry
*orig_entry
;
1629 /* no local entry exists, case 1:
1630 * Check if this is the last one or if other entries exist.
1634 head
= &tt_global_entry
->orig_list
;
1635 hlist_for_each_entry_rcu(orig_entry
, head
, list
) {
1636 if (orig_entry
->orig_node
!= orig_node
) {
1644 /* its the last one, mark for roaming. */
1645 tt_global_entry
->common
.flags
|= BATADV_TT_CLIENT_ROAM
;
1646 tt_global_entry
->roam_at
= jiffies
;
1648 /* there is another entry, we can simply delete this
1649 * one and can still use the other one.
1651 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1652 orig_node
, message
);
1656 * batadv_tt_global_del - remove a client from the global table
1657 * @bat_priv: the bat priv with all the soft interface information
1658 * @orig_node: an originator serving this client
1659 * @addr: the mac address of the client
1660 * @vid: VLAN identifier
1661 * @message: a message explaining the reason for deleting the client to print
1662 * for debugging purpose
1663 * @roaming: true if the deletion has been triggered by a roaming event
1665 static void batadv_tt_global_del(struct batadv_priv
*bat_priv
,
1666 struct batadv_orig_node
*orig_node
,
1667 const unsigned char *addr
, unsigned short vid
,
1668 const char *message
, bool roaming
)
1670 struct batadv_tt_global_entry
*tt_global_entry
;
1671 struct batadv_tt_local_entry
*local_entry
= NULL
;
1673 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1674 if (!tt_global_entry
)
1678 batadv_tt_global_del_orig_entry(bat_priv
, tt_global_entry
,
1679 orig_node
, message
);
1681 if (hlist_empty(&tt_global_entry
->orig_list
))
1682 batadv_tt_global_free(bat_priv
, tt_global_entry
,
1688 /* if we are deleting a global entry due to a roam
1689 * event, there are two possibilities:
1690 * 1) the client roamed from node A to node B => if there
1691 * is only one originator left for this client, we mark
1692 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1693 * wait for node B to claim it. In case of timeout
1694 * the entry is purged.
1696 * If there are other originators left, we directly delete
1698 * 2) the client roamed to us => we can directly delete
1699 * the global entry, since it is useless now.
1701 local_entry
= batadv_tt_local_hash_find(bat_priv
,
1702 tt_global_entry
->common
.addr
,
1705 /* local entry exists, case 2: client roamed to us. */
1706 batadv_tt_global_del_orig_list(tt_global_entry
);
1707 batadv_tt_global_free(bat_priv
, tt_global_entry
, message
);
1709 /* no local entry exists, case 1: check for roaming */
1710 batadv_tt_global_del_roaming(bat_priv
, tt_global_entry
,
1711 orig_node
, message
);
1715 if (tt_global_entry
)
1716 batadv_tt_global_entry_free_ref(tt_global_entry
);
1718 batadv_tt_local_entry_free_ref(local_entry
);
1722 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1723 * given originator matching the provided vid
1724 * @bat_priv: the bat priv with all the soft interface information
1725 * @orig_node: the originator owning the entries to remove
1726 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1728 * @message: debug message to print as "reason"
1730 void batadv_tt_global_del_orig(struct batadv_priv
*bat_priv
,
1731 struct batadv_orig_node
*orig_node
,
1733 const char *message
)
1735 struct batadv_tt_global_entry
*tt_global
;
1736 struct batadv_tt_common_entry
*tt_common_entry
;
1738 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1739 struct hlist_node
*safe
;
1740 struct hlist_head
*head
;
1741 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1747 for (i
= 0; i
< hash
->size
; i
++) {
1748 head
= &hash
->table
[i
];
1749 list_lock
= &hash
->list_locks
[i
];
1751 spin_lock_bh(list_lock
);
1752 hlist_for_each_entry_safe(tt_common_entry
, safe
,
1754 /* remove only matching entries */
1755 if (match_vid
>= 0 && tt_common_entry
->vid
!= match_vid
)
1758 tt_global
= container_of(tt_common_entry
,
1759 struct batadv_tt_global_entry
,
1762 batadv_tt_global_del_orig_entry(bat_priv
, tt_global
,
1763 orig_node
, message
);
1765 if (hlist_empty(&tt_global
->orig_list
)) {
1766 vid
= tt_global
->common
.vid
;
1767 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1768 "Deleting global tt entry %pM (vid: %d): %s\n",
1769 tt_global
->common
.addr
,
1770 BATADV_PRINT_VID(vid
), message
);
1771 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1772 batadv_tt_global_entry_free_ref(tt_global
);
1775 spin_unlock_bh(list_lock
);
1777 orig_node
->capa_initialized
&= ~BATADV_ORIG_CAPA_HAS_TT
;
1780 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry
*tt_global
,
1784 unsigned long roam_timeout
= BATADV_TT_CLIENT_ROAM_TIMEOUT
;
1785 unsigned long temp_timeout
= BATADV_TT_CLIENT_TEMP_TIMEOUT
;
1787 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_ROAM
) &&
1788 batadv_has_timed_out(tt_global
->roam_at
, roam_timeout
)) {
1790 *msg
= "Roaming timeout\n";
1793 if ((tt_global
->common
.flags
& BATADV_TT_CLIENT_TEMP
) &&
1794 batadv_has_timed_out(tt_global
->common
.added_at
, temp_timeout
)) {
1796 *msg
= "Temporary client timeout\n";
1802 static void batadv_tt_global_purge(struct batadv_priv
*bat_priv
)
1804 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1805 struct hlist_head
*head
;
1806 struct hlist_node
*node_tmp
;
1807 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1810 struct batadv_tt_common_entry
*tt_common
;
1811 struct batadv_tt_global_entry
*tt_global
;
1813 for (i
= 0; i
< hash
->size
; i
++) {
1814 head
= &hash
->table
[i
];
1815 list_lock
= &hash
->list_locks
[i
];
1817 spin_lock_bh(list_lock
);
1818 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
1820 tt_global
= container_of(tt_common
,
1821 struct batadv_tt_global_entry
,
1824 if (!batadv_tt_global_to_purge(tt_global
, &msg
))
1827 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
1828 "Deleting global tt entry %pM (vid: %d): %s\n",
1829 tt_global
->common
.addr
,
1830 BATADV_PRINT_VID(tt_global
->common
.vid
),
1833 hlist_del_rcu(&tt_common
->hash_entry
);
1835 batadv_tt_global_entry_free_ref(tt_global
);
1837 spin_unlock_bh(list_lock
);
1841 static void batadv_tt_global_table_free(struct batadv_priv
*bat_priv
)
1843 struct batadv_hashtable
*hash
;
1844 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1845 struct batadv_tt_common_entry
*tt_common_entry
;
1846 struct batadv_tt_global_entry
*tt_global
;
1847 struct hlist_node
*node_tmp
;
1848 struct hlist_head
*head
;
1851 if (!bat_priv
->tt
.global_hash
)
1854 hash
= bat_priv
->tt
.global_hash
;
1856 for (i
= 0; i
< hash
->size
; i
++) {
1857 head
= &hash
->table
[i
];
1858 list_lock
= &hash
->list_locks
[i
];
1860 spin_lock_bh(list_lock
);
1861 hlist_for_each_entry_safe(tt_common_entry
, node_tmp
,
1863 hlist_del_rcu(&tt_common_entry
->hash_entry
);
1864 tt_global
= container_of(tt_common_entry
,
1865 struct batadv_tt_global_entry
,
1867 batadv_tt_global_entry_free_ref(tt_global
);
1869 spin_unlock_bh(list_lock
);
1872 batadv_hash_destroy(hash
);
1874 bat_priv
->tt
.global_hash
= NULL
;
1878 _batadv_is_ap_isolated(struct batadv_tt_local_entry
*tt_local_entry
,
1879 struct batadv_tt_global_entry
*tt_global_entry
)
1883 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
&&
1884 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_WIFI
)
1887 /* check if the two clients are marked as isolated */
1888 if (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
&&
1889 tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ISOLA
)
1896 * batadv_transtable_search - get the mesh destination for a given client
1897 * @bat_priv: the bat priv with all the soft interface information
1898 * @src: mac address of the source client
1899 * @addr: mac address of the destination client
1900 * @vid: VLAN identifier
1902 * Returns a pointer to the originator that was selected as destination in the
1903 * mesh for contacting the client 'addr', NULL otherwise.
1904 * In case of multiple originators serving the same client, the function returns
1905 * the best one (best in terms of metric towards the destination node).
1907 * If the two clients are AP isolated the function returns NULL.
1909 struct batadv_orig_node
*batadv_transtable_search(struct batadv_priv
*bat_priv
,
1911 const uint8_t *addr
,
1914 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
1915 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
1916 struct batadv_orig_node
*orig_node
= NULL
;
1917 struct batadv_tt_orig_list_entry
*best_entry
;
1919 if (src
&& batadv_vlan_ap_isola_get(bat_priv
, vid
)) {
1920 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, src
, vid
);
1921 if (!tt_local_entry
||
1922 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
))
1926 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
1927 if (!tt_global_entry
)
1930 /* check whether the clients should not communicate due to AP
1933 if (tt_local_entry
&&
1934 _batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
1938 best_entry
= batadv_transtable_best_orig(bat_priv
, tt_global_entry
);
1939 /* found anything? */
1941 orig_node
= best_entry
->orig_node
;
1942 if (orig_node
&& !atomic_inc_not_zero(&orig_node
->refcount
))
1947 if (tt_global_entry
)
1948 batadv_tt_global_entry_free_ref(tt_global_entry
);
1950 batadv_tt_local_entry_free_ref(tt_local_entry
);
1956 * batadv_tt_global_crc - calculates the checksum of the local table belonging
1957 * to the given orig_node
1958 * @bat_priv: the bat priv with all the soft interface information
1959 * @orig_node: originator for which the CRC should be computed
1960 * @vid: VLAN identifier for which the CRC32 has to be computed
1962 * This function computes the checksum for the global table corresponding to a
1963 * specific originator. In particular, the checksum is computed as follows: For
1964 * each client connected to the originator the CRC32C of the MAC address and the
1965 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1968 * The idea behind is that CRC32C should be used as much as possible in order to
1969 * produce a unique hash of the table, but since the order which is used to feed
1970 * the CRC32C function affects the result and since every node in the network
1971 * probably sorts the clients differently, the hash function cannot be directly
1972 * computed over the entire table. Hence the CRC32C is used only on
1973 * the single client entry, while all the results are then xor'ed together
1974 * because the XOR operation can combine them all while trying to reduce the
1975 * noise as much as possible.
1977 * Returns the checksum of the global table of a given originator.
1979 static uint32_t batadv_tt_global_crc(struct batadv_priv
*bat_priv
,
1980 struct batadv_orig_node
*orig_node
,
1983 struct batadv_hashtable
*hash
= bat_priv
->tt
.global_hash
;
1984 struct batadv_tt_common_entry
*tt_common
;
1985 struct batadv_tt_global_entry
*tt_global
;
1986 struct hlist_head
*head
;
1987 uint32_t i
, crc_tmp
, crc
= 0;
1991 for (i
= 0; i
< hash
->size
; i
++) {
1992 head
= &hash
->table
[i
];
1995 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
1996 tt_global
= container_of(tt_common
,
1997 struct batadv_tt_global_entry
,
1999 /* compute the CRC only for entries belonging to the
2000 * VLAN identified by the vid passed as parameter
2002 if (tt_common
->vid
!= vid
)
2005 /* Roaming clients are in the global table for
2006 * consistency only. They don't have to be
2007 * taken into account while computing the
2010 if (tt_common
->flags
& BATADV_TT_CLIENT_ROAM
)
2012 /* Temporary clients have not been announced yet, so
2013 * they have to be skipped while computing the global
2016 if (tt_common
->flags
& BATADV_TT_CLIENT_TEMP
)
2019 /* find out if this global entry is announced by this
2022 if (!batadv_tt_global_entry_has_orig(tt_global
,
2026 /* use network order to read the VID: this ensures that
2027 * every node reads the bytes in the same order.
2029 tmp_vid
= htons(tt_common
->vid
);
2030 crc_tmp
= crc32c(0, &tmp_vid
, sizeof(tmp_vid
));
2032 /* compute the CRC on flags that have to be kept in sync
2035 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2036 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2038 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2047 * batadv_tt_local_crc - calculates the checksum of the local table
2048 * @bat_priv: the bat priv with all the soft interface information
2049 * @vid: VLAN identifier for which the CRC32 has to be computed
2051 * For details about the computation, please refer to the documentation for
2052 * batadv_tt_global_crc().
2054 * Returns the checksum of the local table
2056 static uint32_t batadv_tt_local_crc(struct batadv_priv
*bat_priv
,
2059 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
2060 struct batadv_tt_common_entry
*tt_common
;
2061 struct hlist_head
*head
;
2062 uint32_t i
, crc_tmp
, crc
= 0;
2066 for (i
= 0; i
< hash
->size
; i
++) {
2067 head
= &hash
->table
[i
];
2070 hlist_for_each_entry_rcu(tt_common
, head
, hash_entry
) {
2071 /* compute the CRC only for entries belonging to the
2072 * VLAN identified by vid
2074 if (tt_common
->vid
!= vid
)
2077 /* not yet committed clients have not to be taken into
2078 * account while computing the CRC
2080 if (tt_common
->flags
& BATADV_TT_CLIENT_NEW
)
2083 /* use network order to read the VID: this ensures that
2084 * every node reads the bytes in the same order.
2086 tmp_vid
= htons(tt_common
->vid
);
2087 crc_tmp
= crc32c(0, &tmp_vid
, sizeof(tmp_vid
));
2089 /* compute the CRC on flags that have to be kept in sync
2092 flags
= tt_common
->flags
& BATADV_TT_SYNC_MASK
;
2093 crc_tmp
= crc32c(crc_tmp
, &flags
, sizeof(flags
));
2095 crc
^= crc32c(crc_tmp
, tt_common
->addr
, ETH_ALEN
);
2103 static void batadv_tt_req_list_free(struct batadv_priv
*bat_priv
)
2105 struct batadv_tt_req_node
*node
, *safe
;
2107 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2109 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2110 list_del(&node
->list
);
2114 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2117 static void batadv_tt_save_orig_buffer(struct batadv_priv
*bat_priv
,
2118 struct batadv_orig_node
*orig_node
,
2119 const void *tt_buff
,
2120 uint16_t tt_buff_len
)
2122 /* Replace the old buffer only if I received something in the
2123 * last OGM (the OGM could carry no changes)
2125 spin_lock_bh(&orig_node
->tt_buff_lock
);
2126 if (tt_buff_len
> 0) {
2127 kfree(orig_node
->tt_buff
);
2128 orig_node
->tt_buff_len
= 0;
2129 orig_node
->tt_buff
= kmalloc(tt_buff_len
, GFP_ATOMIC
);
2130 if (orig_node
->tt_buff
) {
2131 memcpy(orig_node
->tt_buff
, tt_buff
, tt_buff_len
);
2132 orig_node
->tt_buff_len
= tt_buff_len
;
2135 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2138 static void batadv_tt_req_purge(struct batadv_priv
*bat_priv
)
2140 struct batadv_tt_req_node
*node
, *safe
;
2142 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2143 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2144 if (batadv_has_timed_out(node
->issued_at
,
2145 BATADV_TT_REQUEST_TIMEOUT
)) {
2146 list_del(&node
->list
);
2150 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2153 /* returns the pointer to the new tt_req_node struct if no request
2154 * has already been issued for this orig_node, NULL otherwise
2156 static struct batadv_tt_req_node
*
2157 batadv_new_tt_req_node(struct batadv_priv
*bat_priv
,
2158 struct batadv_orig_node
*orig_node
)
2160 struct batadv_tt_req_node
*tt_req_node_tmp
, *tt_req_node
= NULL
;
2162 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2163 list_for_each_entry(tt_req_node_tmp
, &bat_priv
->tt
.req_list
, list
) {
2164 if (batadv_compare_eth(tt_req_node_tmp
, orig_node
) &&
2165 !batadv_has_timed_out(tt_req_node_tmp
->issued_at
,
2166 BATADV_TT_REQUEST_TIMEOUT
))
2170 tt_req_node
= kmalloc(sizeof(*tt_req_node
), GFP_ATOMIC
);
2174 ether_addr_copy(tt_req_node
->addr
, orig_node
->orig
);
2175 tt_req_node
->issued_at
= jiffies
;
2177 list_add(&tt_req_node
->list
, &bat_priv
->tt
.req_list
);
2179 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2184 * batadv_tt_local_valid - verify that given tt entry is a valid one
2185 * @entry_ptr: to be checked local tt entry
2186 * @data_ptr: not used but definition required to satisfy the callback prototype
2188 * Returns 1 if the entry is a valid, 0 otherwise.
2190 static int batadv_tt_local_valid(const void *entry_ptr
, const void *data_ptr
)
2192 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2194 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_NEW
)
2199 static int batadv_tt_global_valid(const void *entry_ptr
,
2200 const void *data_ptr
)
2202 const struct batadv_tt_common_entry
*tt_common_entry
= entry_ptr
;
2203 const struct batadv_tt_global_entry
*tt_global_entry
;
2204 const struct batadv_orig_node
*orig_node
= data_ptr
;
2206 if (tt_common_entry
->flags
& BATADV_TT_CLIENT_ROAM
||
2207 tt_common_entry
->flags
& BATADV_TT_CLIENT_TEMP
)
2210 tt_global_entry
= container_of(tt_common_entry
,
2211 struct batadv_tt_global_entry
,
2214 return batadv_tt_global_entry_has_orig(tt_global_entry
, orig_node
);
2218 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2220 * @bat_priv: the bat priv with all the soft interface information
2221 * @hash: hash table containing the tt entries
2222 * @tt_len: expected tvlv tt data buffer length in number of bytes
2223 * @tvlv_buff: pointer to the buffer to fill with the TT data
2224 * @valid_cb: function to filter tt change entries
2225 * @cb_data: data passed to the filter function as argument
2227 static void batadv_tt_tvlv_generate(struct batadv_priv
*bat_priv
,
2228 struct batadv_hashtable
*hash
,
2229 void *tvlv_buff
, uint16_t tt_len
,
2230 int (*valid_cb
)(const void *, const void *),
2233 struct batadv_tt_common_entry
*tt_common_entry
;
2234 struct batadv_tvlv_tt_change
*tt_change
;
2235 struct hlist_head
*head
;
2236 uint16_t tt_tot
, tt_num_entries
= 0;
2239 tt_tot
= batadv_tt_entries(tt_len
);
2240 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_buff
;
2243 for (i
= 0; i
< hash
->size
; i
++) {
2244 head
= &hash
->table
[i
];
2246 hlist_for_each_entry_rcu(tt_common_entry
,
2248 if (tt_tot
== tt_num_entries
)
2251 if ((valid_cb
) && (!valid_cb(tt_common_entry
, cb_data
)))
2254 ether_addr_copy(tt_change
->addr
, tt_common_entry
->addr
);
2255 tt_change
->flags
= tt_common_entry
->flags
;
2256 tt_change
->vid
= htons(tt_common_entry
->vid
);
2257 memset(tt_change
->reserved
, 0,
2258 sizeof(tt_change
->reserved
));
2268 * batadv_tt_global_check_crc - check if all the CRCs are correct
2269 * @orig_node: originator for which the CRCs have to be checked
2270 * @tt_vlan: pointer to the first tvlv VLAN entry
2271 * @num_vlan: number of tvlv VLAN entries
2272 * @create: if true, create VLAN objects if not found
2274 * Return true if all the received CRCs match the locally stored ones, false
2277 static bool batadv_tt_global_check_crc(struct batadv_orig_node
*orig_node
,
2278 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2281 struct batadv_tvlv_tt_vlan_data
*tt_vlan_tmp
;
2282 struct batadv_orig_node_vlan
*vlan
;
2286 /* check if each received CRC matches the locally stored one */
2287 for (i
= 0; i
< num_vlan
; i
++) {
2288 tt_vlan_tmp
= tt_vlan
+ i
;
2290 /* if orig_node is a backbone node for this VLAN, don't check
2291 * the CRC as we ignore all the global entries over it
2293 if (batadv_bla_is_backbone_gw_orig(orig_node
->bat_priv
,
2295 ntohs(tt_vlan_tmp
->vid
)))
2298 vlan
= batadv_orig_node_vlan_get(orig_node
,
2299 ntohs(tt_vlan_tmp
->vid
));
2304 batadv_orig_node_vlan_free_ref(vlan
);
2306 if (crc
!= ntohl(tt_vlan_tmp
->crc
))
2314 * batadv_tt_local_update_crc - update all the local CRCs
2315 * @bat_priv: the bat priv with all the soft interface information
2317 static void batadv_tt_local_update_crc(struct batadv_priv
*bat_priv
)
2319 struct batadv_softif_vlan
*vlan
;
2321 /* recompute the global CRC for each VLAN */
2323 hlist_for_each_entry_rcu(vlan
, &bat_priv
->softif_vlan_list
, list
) {
2324 vlan
->tt
.crc
= batadv_tt_local_crc(bat_priv
, vlan
->vid
);
2330 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2331 * @bat_priv: the bat priv with all the soft interface information
2332 * @orig_node: the orig_node for which the CRCs have to be updated
2334 static void batadv_tt_global_update_crc(struct batadv_priv
*bat_priv
,
2335 struct batadv_orig_node
*orig_node
)
2337 struct batadv_orig_node_vlan
*vlan
;
2340 /* recompute the global CRC for each VLAN */
2342 list_for_each_entry_rcu(vlan
, &orig_node
->vlan_list
, list
) {
2343 /* if orig_node is a backbone node for this VLAN, don't compute
2344 * the CRC as we ignore all the global entries over it
2346 if (batadv_bla_is_backbone_gw_orig(bat_priv
, orig_node
->orig
,
2350 crc
= batadv_tt_global_crc(bat_priv
, orig_node
, vlan
->vid
);
2357 * batadv_send_tt_request - send a TT Request message to a given node
2358 * @bat_priv: the bat priv with all the soft interface information
2359 * @dst_orig_node: the destination of the message
2360 * @ttvn: the version number that the source of the message is looking for
2361 * @tt_vlan: pointer to the first tvlv VLAN object to request
2362 * @num_vlan: number of tvlv VLAN entries
2363 * @full_table: ask for the entire translation table if true, while only for the
2364 * last TT diff otherwise
2366 static int batadv_send_tt_request(struct batadv_priv
*bat_priv
,
2367 struct batadv_orig_node
*dst_orig_node
,
2369 struct batadv_tvlv_tt_vlan_data
*tt_vlan
,
2370 uint16_t num_vlan
, bool full_table
)
2372 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2373 struct batadv_tt_req_node
*tt_req_node
= NULL
;
2374 struct batadv_tvlv_tt_vlan_data
*tt_vlan_req
;
2375 struct batadv_hard_iface
*primary_if
;
2379 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2383 /* The new tt_req will be issued only if I'm not waiting for a
2384 * reply from the same orig_node yet
2386 tt_req_node
= batadv_new_tt_req_node(bat_priv
, dst_orig_node
);
2390 size
= sizeof(*tvlv_tt_data
) + sizeof(*tt_vlan_req
) * num_vlan
;
2391 tvlv_tt_data
= kzalloc(size
, GFP_ATOMIC
);
2395 tvlv_tt_data
->flags
= BATADV_TT_REQUEST
;
2396 tvlv_tt_data
->ttvn
= ttvn
;
2397 tvlv_tt_data
->num_vlan
= htons(num_vlan
);
2399 /* send all the CRCs within the request. This is needed by intermediate
2400 * nodes to ensure they have the correct table before replying
2402 tt_vlan_req
= (struct batadv_tvlv_tt_vlan_data
*)(tvlv_tt_data
+ 1);
2403 for (i
= 0; i
< num_vlan
; i
++) {
2404 tt_vlan_req
->vid
= tt_vlan
->vid
;
2405 tt_vlan_req
->crc
= tt_vlan
->crc
;
2412 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2414 batadv_dbg(BATADV_DBG_TT
, bat_priv
, "Sending TT_REQUEST to %pM [%c]\n",
2415 dst_orig_node
->orig
, full_table
? 'F' : '.');
2417 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_TX
);
2418 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2419 dst_orig_node
->orig
, BATADV_TVLV_TT
, 1,
2420 tvlv_tt_data
, size
);
2425 batadv_hardif_free_ref(primary_if
);
2426 if (ret
&& tt_req_node
) {
2427 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2428 list_del(&tt_req_node
->list
);
2429 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2432 kfree(tvlv_tt_data
);
2437 * batadv_send_other_tt_response - send reply to tt request concerning another
2438 * node's translation table
2439 * @bat_priv: the bat priv with all the soft interface information
2440 * @tt_data: tt data containing the tt request information
2441 * @req_src: mac address of tt request sender
2442 * @req_dst: mac address of tt request recipient
2444 * Returns true if tt request reply was sent, false otherwise.
2446 static bool batadv_send_other_tt_response(struct batadv_priv
*bat_priv
,
2447 struct batadv_tvlv_tt_data
*tt_data
,
2448 uint8_t *req_src
, uint8_t *req_dst
)
2450 struct batadv_orig_node
*req_dst_orig_node
;
2451 struct batadv_orig_node
*res_dst_orig_node
= NULL
;
2452 struct batadv_tvlv_tt_change
*tt_change
;
2453 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2454 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
2455 bool ret
= false, full_table
;
2456 uint8_t orig_ttvn
, req_ttvn
;
2460 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2461 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2462 req_src
, tt_data
->ttvn
, req_dst
,
2463 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2465 /* Let's get the orig node of the REAL destination */
2466 req_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_dst
);
2467 if (!req_dst_orig_node
)
2470 res_dst_orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2471 if (!res_dst_orig_node
)
2474 orig_ttvn
= (uint8_t)atomic_read(&req_dst_orig_node
->last_ttvn
);
2475 req_ttvn
= tt_data
->ttvn
;
2477 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
2478 /* this node doesn't have the requested data */
2479 if (orig_ttvn
!= req_ttvn
||
2480 !batadv_tt_global_check_crc(req_dst_orig_node
, tt_vlan
,
2481 ntohs(tt_data
->num_vlan
)))
2484 /* If the full table has been explicitly requested */
2485 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
||
2486 !req_dst_orig_node
->tt_buff
)
2491 /* TT fragmentation hasn't been implemented yet, so send as many
2492 * TT entries fit a single packet as possible only
2495 spin_lock_bh(&req_dst_orig_node
->tt_buff_lock
);
2496 tt_len
= req_dst_orig_node
->tt_buff_len
;
2498 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2505 /* Copy the last orig_node's OGM buffer */
2506 memcpy(tt_change
, req_dst_orig_node
->tt_buff
,
2507 req_dst_orig_node
->tt_buff_len
);
2508 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2510 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2511 * in the initial part
2514 tvlv_len
= batadv_tt_prepare_tvlv_global_data(req_dst_orig_node
,
2521 /* fill the rest of the tvlv with the real TT entries */
2522 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.global_hash
,
2524 batadv_tt_global_valid
,
2528 /* Don't send the response, if larger than fragmented packet. */
2529 tt_len
= sizeof(struct batadv_unicast_tvlv_packet
) + tvlv_len
;
2530 if (tt_len
> atomic_read(&bat_priv
->packet_size_max
)) {
2531 net_ratelimited_function(batadv_info
, bat_priv
->soft_iface
,
2532 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2533 res_dst_orig_node
->orig
);
2537 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2538 tvlv_tt_data
->ttvn
= req_ttvn
;
2541 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2543 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2544 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2545 res_dst_orig_node
->orig
, req_dst_orig_node
->orig
,
2546 full_table
? 'F' : '.', req_ttvn
);
2548 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2550 batadv_tvlv_unicast_send(bat_priv
, req_dst_orig_node
->orig
,
2551 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2558 spin_unlock_bh(&req_dst_orig_node
->tt_buff_lock
);
2561 if (res_dst_orig_node
)
2562 batadv_orig_node_free_ref(res_dst_orig_node
);
2563 if (req_dst_orig_node
)
2564 batadv_orig_node_free_ref(req_dst_orig_node
);
2565 kfree(tvlv_tt_data
);
2570 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2572 * @bat_priv: the bat priv with all the soft interface information
2573 * @tt_data: tt data containing the tt request information
2574 * @req_src: mac address of tt request sender
2576 * Returns true if tt request reply was sent, false otherwise.
2578 static bool batadv_send_my_tt_response(struct batadv_priv
*bat_priv
,
2579 struct batadv_tvlv_tt_data
*tt_data
,
2582 struct batadv_tvlv_tt_data
*tvlv_tt_data
= NULL
;
2583 struct batadv_hard_iface
*primary_if
= NULL
;
2584 struct batadv_tvlv_tt_change
*tt_change
;
2585 struct batadv_orig_node
*orig_node
;
2586 uint8_t my_ttvn
, req_ttvn
;
2591 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2592 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2593 req_src
, tt_data
->ttvn
,
2594 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2596 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
2598 my_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2599 req_ttvn
= tt_data
->ttvn
;
2601 orig_node
= batadv_orig_hash_find(bat_priv
, req_src
);
2605 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2609 /* If the full table has been explicitly requested or the gap
2610 * is too big send the whole local translation table
2612 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
|| my_ttvn
!= req_ttvn
||
2613 !bat_priv
->tt
.last_changeset
)
2618 /* TT fragmentation hasn't been implemented yet, so send as many
2619 * TT entries fit a single packet as possible only
2622 spin_lock_bh(&bat_priv
->tt
.last_changeset_lock
);
2624 tt_len
= bat_priv
->tt
.last_changeset_len
;
2625 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2632 /* Copy the last orig_node's OGM buffer */
2633 memcpy(tt_change
, bat_priv
->tt
.last_changeset
,
2634 bat_priv
->tt
.last_changeset_len
);
2635 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2637 req_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
2639 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2640 * in the initial part
2643 tvlv_len
= batadv_tt_prepare_tvlv_local_data(bat_priv
,
2650 /* fill the rest of the tvlv with the real TT entries */
2651 batadv_tt_tvlv_generate(bat_priv
, bat_priv
->tt
.local_hash
,
2653 batadv_tt_local_valid
, NULL
);
2656 tvlv_tt_data
->flags
= BATADV_TT_RESPONSE
;
2657 tvlv_tt_data
->ttvn
= req_ttvn
;
2660 tvlv_tt_data
->flags
|= BATADV_TT_FULL_TABLE
;
2662 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2663 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2664 orig_node
->orig
, full_table
? 'F' : '.', req_ttvn
);
2666 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_TX
);
2668 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2669 req_src
, BATADV_TVLV_TT
, 1, tvlv_tt_data
,
2675 spin_unlock_bh(&bat_priv
->tt
.last_changeset_lock
);
2677 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
2679 batadv_orig_node_free_ref(orig_node
);
2681 batadv_hardif_free_ref(primary_if
);
2682 kfree(tvlv_tt_data
);
2683 /* The packet was for this host, so it doesn't need to be re-routed */
2688 * batadv_send_tt_response - send reply to tt request
2689 * @bat_priv: the bat priv with all the soft interface information
2690 * @tt_data: tt data containing the tt request information
2691 * @req_src: mac address of tt request sender
2692 * @req_dst: mac address of tt request recipient
2694 * Returns true if tt request reply was sent, false otherwise.
2696 static bool batadv_send_tt_response(struct batadv_priv
*bat_priv
,
2697 struct batadv_tvlv_tt_data
*tt_data
,
2698 uint8_t *req_src
, uint8_t *req_dst
)
2700 if (batadv_is_my_mac(bat_priv
, req_dst
))
2701 return batadv_send_my_tt_response(bat_priv
, tt_data
, req_src
);
2703 return batadv_send_other_tt_response(bat_priv
, tt_data
,
2707 static void _batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2708 struct batadv_orig_node
*orig_node
,
2709 struct batadv_tvlv_tt_change
*tt_change
,
2710 uint16_t tt_num_changes
, uint8_t ttvn
)
2715 for (i
= 0; i
< tt_num_changes
; i
++) {
2716 if ((tt_change
+ i
)->flags
& BATADV_TT_CLIENT_DEL
) {
2717 roams
= (tt_change
+ i
)->flags
& BATADV_TT_CLIENT_ROAM
;
2718 batadv_tt_global_del(bat_priv
, orig_node
,
2719 (tt_change
+ i
)->addr
,
2720 ntohs((tt_change
+ i
)->vid
),
2721 "tt removed by changes",
2724 if (!batadv_tt_global_add(bat_priv
, orig_node
,
2725 (tt_change
+ i
)->addr
,
2726 ntohs((tt_change
+ i
)->vid
),
2727 (tt_change
+ i
)->flags
, ttvn
))
2728 /* In case of problem while storing a
2729 * global_entry, we stop the updating
2730 * procedure without committing the
2731 * ttvn change. This will avoid to send
2732 * corrupted data on tt_request
2737 orig_node
->capa_initialized
|= BATADV_ORIG_CAPA_HAS_TT
;
2740 static void batadv_tt_fill_gtable(struct batadv_priv
*bat_priv
,
2741 struct batadv_tvlv_tt_change
*tt_change
,
2742 uint8_t ttvn
, uint8_t *resp_src
,
2743 uint16_t num_entries
)
2745 struct batadv_orig_node
*orig_node
;
2747 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2751 /* Purge the old table first.. */
2752 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
2753 "Received full table");
2755 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
, num_entries
,
2758 spin_lock_bh(&orig_node
->tt_buff_lock
);
2759 kfree(orig_node
->tt_buff
);
2760 orig_node
->tt_buff_len
= 0;
2761 orig_node
->tt_buff
= NULL
;
2762 spin_unlock_bh(&orig_node
->tt_buff_lock
);
2764 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2768 batadv_orig_node_free_ref(orig_node
);
2771 static void batadv_tt_update_changes(struct batadv_priv
*bat_priv
,
2772 struct batadv_orig_node
*orig_node
,
2773 uint16_t tt_num_changes
, uint8_t ttvn
,
2774 struct batadv_tvlv_tt_change
*tt_change
)
2776 _batadv_tt_update_changes(bat_priv
, orig_node
, tt_change
,
2777 tt_num_changes
, ttvn
);
2779 batadv_tt_save_orig_buffer(bat_priv
, orig_node
, tt_change
,
2780 batadv_tt_len(tt_num_changes
));
2781 atomic_set(&orig_node
->last_ttvn
, ttvn
);
2785 * batadv_is_my_client - check if a client is served by the local node
2786 * @bat_priv: the bat priv with all the soft interface information
2787 * @addr: the mac adress of the client to check
2788 * @vid: VLAN identifier
2790 * Returns true if the client is served by this node, false otherwise.
2792 bool batadv_is_my_client(struct batadv_priv
*bat_priv
, const uint8_t *addr
,
2795 struct batadv_tt_local_entry
*tt_local_entry
;
2798 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
2799 if (!tt_local_entry
)
2801 /* Check if the client has been logically deleted (but is kept for
2802 * consistency purpose)
2804 if ((tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_PENDING
) ||
2805 (tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
))
2810 batadv_tt_local_entry_free_ref(tt_local_entry
);
2815 * batadv_handle_tt_response - process incoming tt reply
2816 * @bat_priv: the bat priv with all the soft interface information
2817 * @tt_data: tt data containing the tt request information
2818 * @resp_src: mac address of tt reply sender
2819 * @num_entries: number of tt change entries appended to the tt data
2821 static void batadv_handle_tt_response(struct batadv_priv
*bat_priv
,
2822 struct batadv_tvlv_tt_data
*tt_data
,
2823 uint8_t *resp_src
, uint16_t num_entries
)
2825 struct batadv_tt_req_node
*node
, *safe
;
2826 struct batadv_orig_node
*orig_node
= NULL
;
2827 struct batadv_tvlv_tt_change
*tt_change
;
2828 uint8_t *tvlv_ptr
= (uint8_t *)tt_data
;
2829 uint16_t change_offset
;
2831 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2832 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2833 resp_src
, tt_data
->ttvn
, num_entries
,
2834 (tt_data
->flags
& BATADV_TT_FULL_TABLE
? 'F' : '.'));
2836 orig_node
= batadv_orig_hash_find(bat_priv
, resp_src
);
2840 spin_lock_bh(&orig_node
->tt_lock
);
2842 change_offset
= sizeof(struct batadv_tvlv_tt_vlan_data
);
2843 change_offset
*= ntohs(tt_data
->num_vlan
);
2844 change_offset
+= sizeof(*tt_data
);
2845 tvlv_ptr
+= change_offset
;
2847 tt_change
= (struct batadv_tvlv_tt_change
*)tvlv_ptr
;
2848 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
) {
2849 batadv_tt_fill_gtable(bat_priv
, tt_change
, tt_data
->ttvn
,
2850 resp_src
, num_entries
);
2852 batadv_tt_update_changes(bat_priv
, orig_node
, num_entries
,
2853 tt_data
->ttvn
, tt_change
);
2856 /* Recalculate the CRC for this orig_node and store it */
2857 batadv_tt_global_update_crc(bat_priv
, orig_node
);
2859 spin_unlock_bh(&orig_node
->tt_lock
);
2861 /* Delete the tt_req_node from pending tt_requests list */
2862 spin_lock_bh(&bat_priv
->tt
.req_list_lock
);
2863 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.req_list
, list
) {
2864 if (!batadv_compare_eth(node
->addr
, resp_src
))
2866 list_del(&node
->list
);
2870 spin_unlock_bh(&bat_priv
->tt
.req_list_lock
);
2873 batadv_orig_node_free_ref(orig_node
);
2876 static void batadv_tt_roam_list_free(struct batadv_priv
*bat_priv
)
2878 struct batadv_tt_roam_node
*node
, *safe
;
2880 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2882 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2883 list_del(&node
->list
);
2887 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2890 static void batadv_tt_roam_purge(struct batadv_priv
*bat_priv
)
2892 struct batadv_tt_roam_node
*node
, *safe
;
2894 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2895 list_for_each_entry_safe(node
, safe
, &bat_priv
->tt
.roam_list
, list
) {
2896 if (!batadv_has_timed_out(node
->first_time
,
2897 BATADV_ROAMING_MAX_TIME
))
2900 list_del(&node
->list
);
2903 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2906 /* This function checks whether the client already reached the
2907 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2910 * returns true if the ROAMING_ADV can be sent, false otherwise
2912 static bool batadv_tt_check_roam_count(struct batadv_priv
*bat_priv
,
2915 struct batadv_tt_roam_node
*tt_roam_node
;
2918 spin_lock_bh(&bat_priv
->tt
.roam_list_lock
);
2919 /* The new tt_req will be issued only if I'm not waiting for a
2920 * reply from the same orig_node yet
2922 list_for_each_entry(tt_roam_node
, &bat_priv
->tt
.roam_list
, list
) {
2923 if (!batadv_compare_eth(tt_roam_node
->addr
, client
))
2926 if (batadv_has_timed_out(tt_roam_node
->first_time
,
2927 BATADV_ROAMING_MAX_TIME
))
2930 if (!batadv_atomic_dec_not_zero(&tt_roam_node
->counter
))
2931 /* Sorry, you roamed too many times! */
2938 tt_roam_node
= kmalloc(sizeof(*tt_roam_node
), GFP_ATOMIC
);
2942 tt_roam_node
->first_time
= jiffies
;
2943 atomic_set(&tt_roam_node
->counter
,
2944 BATADV_ROAMING_MAX_COUNT
- 1);
2945 ether_addr_copy(tt_roam_node
->addr
, client
);
2947 list_add(&tt_roam_node
->list
, &bat_priv
->tt
.roam_list
);
2952 spin_unlock_bh(&bat_priv
->tt
.roam_list_lock
);
2957 * batadv_send_roam_adv - send a roaming advertisement message
2958 * @bat_priv: the bat priv with all the soft interface information
2959 * @client: mac address of the roaming client
2960 * @vid: VLAN identifier
2961 * @orig_node: message destination
2963 * Send a ROAMING_ADV message to the node which was previously serving this
2964 * client. This is done to inform the node that from now on all traffic destined
2965 * for this particular roamed client has to be forwarded to the sender of the
2968 static void batadv_send_roam_adv(struct batadv_priv
*bat_priv
, uint8_t *client
,
2970 struct batadv_orig_node
*orig_node
)
2972 struct batadv_hard_iface
*primary_if
;
2973 struct batadv_tvlv_roam_adv tvlv_roam
;
2975 primary_if
= batadv_primary_if_get_selected(bat_priv
);
2979 /* before going on we have to check whether the client has
2980 * already roamed to us too many times
2982 if (!batadv_tt_check_roam_count(bat_priv
, client
))
2985 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
2986 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2987 orig_node
->orig
, client
, BATADV_PRINT_VID(vid
));
2989 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_TX
);
2991 memcpy(tvlv_roam
.client
, client
, sizeof(tvlv_roam
.client
));
2992 tvlv_roam
.vid
= htons(vid
);
2994 batadv_tvlv_unicast_send(bat_priv
, primary_if
->net_dev
->dev_addr
,
2995 orig_node
->orig
, BATADV_TVLV_ROAM
, 1,
2996 &tvlv_roam
, sizeof(tvlv_roam
));
3000 batadv_hardif_free_ref(primary_if
);
3003 static void batadv_tt_purge(struct work_struct
*work
)
3005 struct delayed_work
*delayed_work
;
3006 struct batadv_priv_tt
*priv_tt
;
3007 struct batadv_priv
*bat_priv
;
3009 delayed_work
= container_of(work
, struct delayed_work
, work
);
3010 priv_tt
= container_of(delayed_work
, struct batadv_priv_tt
, work
);
3011 bat_priv
= container_of(priv_tt
, struct batadv_priv
, tt
);
3013 batadv_tt_local_purge(bat_priv
, BATADV_TT_LOCAL_TIMEOUT
);
3014 batadv_tt_global_purge(bat_priv
);
3015 batadv_tt_req_purge(bat_priv
);
3016 batadv_tt_roam_purge(bat_priv
);
3018 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3019 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3022 void batadv_tt_free(struct batadv_priv
*bat_priv
)
3024 batadv_tvlv_container_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3025 batadv_tvlv_handler_unregister(bat_priv
, BATADV_TVLV_TT
, 1);
3027 cancel_delayed_work_sync(&bat_priv
->tt
.work
);
3029 batadv_tt_local_table_free(bat_priv
);
3030 batadv_tt_global_table_free(bat_priv
);
3031 batadv_tt_req_list_free(bat_priv
);
3032 batadv_tt_changes_list_free(bat_priv
);
3033 batadv_tt_roam_list_free(bat_priv
);
3035 kfree(bat_priv
->tt
.last_changeset
);
3039 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3040 * table and possibly count them in the TT size
3041 * @bat_priv: the bat priv with all the soft interface information
3042 * @flags: the flag to switch
3043 * @enable: whether to set or unset the flag
3044 * @count: whether to increase the TT size by the number of changed entries
3046 static void batadv_tt_local_set_flags(struct batadv_priv
*bat_priv
,
3047 uint16_t flags
, bool enable
, bool count
)
3049 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3050 struct batadv_tt_common_entry
*tt_common_entry
;
3051 uint16_t changed_num
= 0;
3052 struct hlist_head
*head
;
3058 for (i
= 0; i
< hash
->size
; i
++) {
3059 head
= &hash
->table
[i
];
3062 hlist_for_each_entry_rcu(tt_common_entry
,
3065 if ((tt_common_entry
->flags
& flags
) == flags
)
3067 tt_common_entry
->flags
|= flags
;
3069 if (!(tt_common_entry
->flags
& flags
))
3071 tt_common_entry
->flags
&= ~flags
;
3078 batadv_tt_local_size_inc(bat_priv
,
3079 tt_common_entry
->vid
);
3085 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3086 static void batadv_tt_local_purge_pending_clients(struct batadv_priv
*bat_priv
)
3088 struct batadv_hashtable
*hash
= bat_priv
->tt
.local_hash
;
3089 struct batadv_tt_common_entry
*tt_common
;
3090 struct batadv_tt_local_entry
*tt_local
;
3091 struct hlist_node
*node_tmp
;
3092 struct hlist_head
*head
;
3093 spinlock_t
*list_lock
; /* protects write access to the hash lists */
3099 for (i
= 0; i
< hash
->size
; i
++) {
3100 head
= &hash
->table
[i
];
3101 list_lock
= &hash
->list_locks
[i
];
3103 spin_lock_bh(list_lock
);
3104 hlist_for_each_entry_safe(tt_common
, node_tmp
, head
,
3106 if (!(tt_common
->flags
& BATADV_TT_CLIENT_PENDING
))
3109 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3110 "Deleting local tt entry (%pM, vid: %d): pending\n",
3112 BATADV_PRINT_VID(tt_common
->vid
));
3114 batadv_tt_local_size_dec(bat_priv
, tt_common
->vid
);
3115 hlist_del_rcu(&tt_common
->hash_entry
);
3116 tt_local
= container_of(tt_common
,
3117 struct batadv_tt_local_entry
,
3119 batadv_tt_local_entry_free_ref(tt_local
);
3121 spin_unlock_bh(list_lock
);
3126 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3127 * which have been queued in the time since the last commit
3128 * @bat_priv: the bat priv with all the soft interface information
3130 * Caller must hold tt->commit_lock.
3132 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv
*bat_priv
)
3134 /* Update multicast addresses in local translation table */
3135 batadv_mcast_mla_update(bat_priv
);
3137 if (atomic_read(&bat_priv
->tt
.local_changes
) < 1) {
3138 if (!batadv_atomic_dec_not_zero(&bat_priv
->tt
.ogm_append_cnt
))
3139 batadv_tt_tvlv_container_update(bat_priv
);
3143 batadv_tt_local_set_flags(bat_priv
, BATADV_TT_CLIENT_NEW
, false, true);
3145 batadv_tt_local_purge_pending_clients(bat_priv
);
3146 batadv_tt_local_update_crc(bat_priv
);
3148 /* Increment the TTVN only once per OGM interval */
3149 atomic_inc(&bat_priv
->tt
.vn
);
3150 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3151 "Local changes committed, updating to ttvn %u\n",
3152 (uint8_t)atomic_read(&bat_priv
->tt
.vn
));
3154 /* reset the sending counter */
3155 atomic_set(&bat_priv
->tt
.ogm_append_cnt
, BATADV_TT_OGM_APPEND_MAX
);
3156 batadv_tt_tvlv_container_update(bat_priv
);
3160 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3161 * have been queued in the time since the last commit
3162 * @bat_priv: the bat priv with all the soft interface information
3164 void batadv_tt_local_commit_changes(struct batadv_priv
*bat_priv
)
3166 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3167 batadv_tt_local_commit_changes_nolock(bat_priv
);
3168 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3171 bool batadv_is_ap_isolated(struct batadv_priv
*bat_priv
, uint8_t *src
,
3172 uint8_t *dst
, unsigned short vid
)
3174 struct batadv_tt_local_entry
*tt_local_entry
= NULL
;
3175 struct batadv_tt_global_entry
*tt_global_entry
= NULL
;
3176 struct batadv_softif_vlan
*vlan
;
3179 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
3180 if (!vlan
|| !atomic_read(&vlan
->ap_isolation
))
3183 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, dst
, vid
);
3184 if (!tt_local_entry
)
3187 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, src
, vid
);
3188 if (!tt_global_entry
)
3191 if (!_batadv_is_ap_isolated(tt_local_entry
, tt_global_entry
))
3198 batadv_softif_vlan_free_ref(vlan
);
3199 if (tt_global_entry
)
3200 batadv_tt_global_entry_free_ref(tt_global_entry
);
3202 batadv_tt_local_entry_free_ref(tt_local_entry
);
3207 * batadv_tt_update_orig - update global translation table with new tt
3208 * information received via ogms
3209 * @bat_priv: the bat priv with all the soft interface information
3210 * @orig: the orig_node of the ogm
3211 * @tt_vlan: pointer to the first tvlv VLAN entry
3212 * @tt_num_vlan: number of tvlv VLAN entries
3213 * @tt_change: pointer to the first entry in the TT buffer
3214 * @tt_num_changes: number of tt changes inside the tt buffer
3215 * @ttvn: translation table version number of this changeset
3216 * @tt_crc: crc32 checksum of orig node's translation table
3218 static void batadv_tt_update_orig(struct batadv_priv
*bat_priv
,
3219 struct batadv_orig_node
*orig_node
,
3220 const void *tt_buff
, uint16_t tt_num_vlan
,
3221 struct batadv_tvlv_tt_change
*tt_change
,
3222 uint16_t tt_num_changes
, uint8_t ttvn
)
3224 uint8_t orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
3225 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3226 bool full_table
= true;
3229 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)tt_buff
;
3230 has_tt_init
= orig_node
->capa_initialized
& BATADV_ORIG_CAPA_HAS_TT
;
3232 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3233 * increased by one -> we can apply the attached changes
3235 if ((!has_tt_init
&& ttvn
== 1) || ttvn
- orig_ttvn
== 1) {
3236 /* the OGM could not contain the changes due to their size or
3237 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3239 * In this case send a tt request
3241 if (!tt_num_changes
) {
3246 spin_lock_bh(&orig_node
->tt_lock
);
3248 batadv_tt_update_changes(bat_priv
, orig_node
, tt_num_changes
,
3251 /* Even if we received the precomputed crc with the OGM, we
3252 * prefer to recompute it to spot any possible inconsistency
3253 * in the global table
3255 batadv_tt_global_update_crc(bat_priv
, orig_node
);
3257 spin_unlock_bh(&orig_node
->tt_lock
);
3259 /* The ttvn alone is not enough to guarantee consistency
3260 * because a single value could represent different states
3261 * (due to the wrap around). Thus a node has to check whether
3262 * the resulting table (after applying the changes) is still
3263 * consistent or not. E.g. a node could disconnect while its
3264 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3265 * checking the CRC value is mandatory to detect the
3268 if (!batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3272 /* if we missed more than one change or our tables are not
3273 * in sync anymore -> request fresh tt data
3275 if (!has_tt_init
|| ttvn
!= orig_ttvn
||
3276 !batadv_tt_global_check_crc(orig_node
, tt_vlan
,
3279 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3280 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3281 orig_node
->orig
, ttvn
, orig_ttvn
,
3283 batadv_send_tt_request(bat_priv
, orig_node
, ttvn
,
3284 tt_vlan
, tt_num_vlan
,
3292 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3293 * @bat_priv: the bat priv with all the soft interface information
3294 * @addr: the mac address of the client to check
3295 * @vid: VLAN identifier
3297 * Returns true if we know that the client has moved from its old originator
3298 * to another one. This entry is still kept for consistency purposes and will be
3299 * deleted later by a DEL or because of timeout
3301 bool batadv_tt_global_client_is_roaming(struct batadv_priv
*bat_priv
,
3302 uint8_t *addr
, unsigned short vid
)
3304 struct batadv_tt_global_entry
*tt_global_entry
;
3307 tt_global_entry
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3308 if (!tt_global_entry
)
3311 ret
= tt_global_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3312 batadv_tt_global_entry_free_ref(tt_global_entry
);
3318 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3319 * @bat_priv: the bat priv with all the soft interface information
3320 * @addr: the mac address of the local client to query
3321 * @vid: VLAN identifier
3323 * Returns true if the local client is known to be roaming (it is not served by
3324 * this node anymore) or not. If yes, the client is still present in the table
3325 * to keep the latter consistent with the node TTVN
3327 bool batadv_tt_local_client_is_roaming(struct batadv_priv
*bat_priv
,
3328 uint8_t *addr
, unsigned short vid
)
3330 struct batadv_tt_local_entry
*tt_local_entry
;
3333 tt_local_entry
= batadv_tt_local_hash_find(bat_priv
, addr
, vid
);
3334 if (!tt_local_entry
)
3337 ret
= tt_local_entry
->common
.flags
& BATADV_TT_CLIENT_ROAM
;
3338 batadv_tt_local_entry_free_ref(tt_local_entry
);
3343 bool batadv_tt_add_temporary_global_entry(struct batadv_priv
*bat_priv
,
3344 struct batadv_orig_node
*orig_node
,
3345 const unsigned char *addr
,
3350 if (!batadv_tt_global_add(bat_priv
, orig_node
, addr
, vid
,
3351 BATADV_TT_CLIENT_TEMP
,
3352 atomic_read(&orig_node
->last_ttvn
)))
3355 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3356 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3357 addr
, BATADV_PRINT_VID(vid
), orig_node
->orig
);
3364 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3365 * maximum packet size that can be transported through the mesh
3366 * @soft_iface: netdev struct of the mesh interface
3368 * Remove entries older than 'timeout' and half timeout if more entries need
3371 void batadv_tt_local_resize_to_mtu(struct net_device
*soft_iface
)
3373 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
3374 int packet_size_max
= atomic_read(&bat_priv
->packet_size_max
);
3375 int table_size
, timeout
= BATADV_TT_LOCAL_TIMEOUT
/ 2;
3376 bool reduced
= false;
3378 spin_lock_bh(&bat_priv
->tt
.commit_lock
);
3381 table_size
= batadv_tt_local_table_transmit_size(bat_priv
);
3382 if (packet_size_max
>= table_size
)
3385 batadv_tt_local_purge(bat_priv
, timeout
);
3386 batadv_tt_local_purge_pending_clients(bat_priv
);
3390 net_ratelimited_function(batadv_info
, soft_iface
,
3391 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3395 /* commit these changes immediately, to avoid synchronization problem
3399 batadv_tt_local_commit_changes_nolock(bat_priv
);
3401 spin_unlock_bh(&bat_priv
->tt
.commit_lock
);
3405 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3406 * @bat_priv: the bat priv with all the soft interface information
3407 * @orig: the orig_node of the ogm
3408 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3409 * @tvlv_value: tvlv buffer containing the gateway data
3410 * @tvlv_value_len: tvlv buffer length
3412 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv
*bat_priv
,
3413 struct batadv_orig_node
*orig
,
3414 uint8_t flags
, void *tvlv_value
,
3415 uint16_t tvlv_value_len
)
3417 struct batadv_tvlv_tt_vlan_data
*tt_vlan
;
3418 struct batadv_tvlv_tt_change
*tt_change
;
3419 struct batadv_tvlv_tt_data
*tt_data
;
3420 uint16_t num_entries
, num_vlan
;
3422 if (tvlv_value_len
< sizeof(*tt_data
))
3425 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3426 tvlv_value_len
-= sizeof(*tt_data
);
3428 num_vlan
= ntohs(tt_data
->num_vlan
);
3430 if (tvlv_value_len
< sizeof(*tt_vlan
) * num_vlan
)
3433 tt_vlan
= (struct batadv_tvlv_tt_vlan_data
*)(tt_data
+ 1);
3434 tt_change
= (struct batadv_tvlv_tt_change
*)(tt_vlan
+ num_vlan
);
3435 tvlv_value_len
-= sizeof(*tt_vlan
) * num_vlan
;
3437 num_entries
= batadv_tt_entries(tvlv_value_len
);
3439 batadv_tt_update_orig(bat_priv
, orig
, tt_vlan
, num_vlan
, tt_change
,
3440 num_entries
, tt_data
->ttvn
);
3444 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3446 * @bat_priv: the bat priv with all the soft interface information
3447 * @src: mac address of tt tvlv sender
3448 * @dst: mac address of tt tvlv recipient
3449 * @tvlv_value: tvlv buffer containing the tt data
3450 * @tvlv_value_len: tvlv buffer length
3452 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3455 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3456 uint8_t *src
, uint8_t *dst
,
3458 uint16_t tvlv_value_len
)
3460 struct batadv_tvlv_tt_data
*tt_data
;
3461 uint16_t tt_vlan_len
, tt_num_entries
;
3465 if (tvlv_value_len
< sizeof(*tt_data
))
3466 return NET_RX_SUCCESS
;
3468 tt_data
= (struct batadv_tvlv_tt_data
*)tvlv_value
;
3469 tvlv_value_len
-= sizeof(*tt_data
);
3471 tt_vlan_len
= sizeof(struct batadv_tvlv_tt_vlan_data
);
3472 tt_vlan_len
*= ntohs(tt_data
->num_vlan
);
3474 if (tvlv_value_len
< tt_vlan_len
)
3475 return NET_RX_SUCCESS
;
3477 tvlv_value_len
-= tt_vlan_len
;
3478 tt_num_entries
= batadv_tt_entries(tvlv_value_len
);
3480 switch (tt_data
->flags
& BATADV_TT_DATA_TYPE_MASK
) {
3481 case BATADV_TT_REQUEST
:
3482 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
3484 /* If this node cannot provide a TT response the tt_request is
3487 ret
= batadv_send_tt_response(bat_priv
, tt_data
, src
, dst
);
3489 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3494 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3495 "Routing TT_REQUEST to %pM [%c]\n",
3497 /* tvlv API will re-route the packet */
3501 case BATADV_TT_RESPONSE
:
3502 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
3504 if (batadv_is_my_mac(bat_priv
, dst
)) {
3505 batadv_handle_tt_response(bat_priv
, tt_data
,
3506 src
, tt_num_entries
);
3507 return NET_RX_SUCCESS
;
3510 if (tt_data
->flags
& BATADV_TT_FULL_TABLE
)
3515 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3516 "Routing TT_RESPONSE to %pM [%c]\n", dst
, tt_flag
);
3518 /* tvlv API will re-route the packet */
3522 return NET_RX_SUCCESS
;
3526 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3527 * @bat_priv: the bat priv with all the soft interface information
3528 * @src: mac address of tt tvlv sender
3529 * @dst: mac address of tt tvlv recipient
3530 * @tvlv_value: tvlv buffer containing the tt data
3531 * @tvlv_value_len: tvlv buffer length
3533 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3536 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv
*bat_priv
,
3537 uint8_t *src
, uint8_t *dst
,
3539 uint16_t tvlv_value_len
)
3541 struct batadv_tvlv_roam_adv
*roaming_adv
;
3542 struct batadv_orig_node
*orig_node
= NULL
;
3544 /* If this node is not the intended recipient of the
3545 * roaming advertisement the packet is forwarded
3546 * (the tvlv API will re-route the packet).
3548 if (!batadv_is_my_mac(bat_priv
, dst
))
3551 if (tvlv_value_len
< sizeof(*roaming_adv
))
3554 orig_node
= batadv_orig_hash_find(bat_priv
, src
);
3558 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
3559 roaming_adv
= (struct batadv_tvlv_roam_adv
*)tvlv_value
;
3561 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
3562 "Received ROAMING_ADV from %pM (client %pM)\n",
3563 src
, roaming_adv
->client
);
3565 batadv_tt_global_add(bat_priv
, orig_node
, roaming_adv
->client
,
3566 ntohs(roaming_adv
->vid
), BATADV_TT_CLIENT_ROAM
,
3567 atomic_read(&orig_node
->last_ttvn
) + 1);
3571 batadv_orig_node_free_ref(orig_node
);
3572 return NET_RX_SUCCESS
;
3576 * batadv_tt_init - initialise the translation table internals
3577 * @bat_priv: the bat priv with all the soft interface information
3579 * Return 0 on success or negative error number in case of failure.
3581 int batadv_tt_init(struct batadv_priv
*bat_priv
)
3585 /* synchronized flags must be remote */
3586 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK
& BATADV_TT_REMOTE_MASK
));
3588 ret
= batadv_tt_local_init(bat_priv
);
3592 ret
= batadv_tt_global_init(bat_priv
);
3596 batadv_tvlv_handler_register(bat_priv
, batadv_tt_tvlv_ogm_handler_v1
,
3597 batadv_tt_tvlv_unicast_handler_v1
,
3598 BATADV_TVLV_TT
, 1, BATADV_NO_FLAGS
);
3600 batadv_tvlv_handler_register(bat_priv
, NULL
,
3601 batadv_roam_tvlv_unicast_handler_v1
,
3602 BATADV_TVLV_ROAM
, 1, BATADV_NO_FLAGS
);
3604 INIT_DELAYED_WORK(&bat_priv
->tt
.work
, batadv_tt_purge
);
3605 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->tt
.work
,
3606 msecs_to_jiffies(BATADV_TT_WORK_PERIOD
));
3612 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3613 * @bat_priv: the bat priv with all the soft interface information
3614 * @addr: the mac address of the client
3615 * @vid: the identifier of the VLAN where this client is connected
3617 * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3620 bool batadv_tt_global_is_isolated(struct batadv_priv
*bat_priv
,
3621 const uint8_t *addr
, unsigned short vid
)
3623 struct batadv_tt_global_entry
*tt
;
3626 tt
= batadv_tt_global_hash_find(bat_priv
, addr
, vid
);
3630 ret
= tt
->common
.flags
& BATADV_TT_CLIENT_ISOLA
;
3632 batadv_tt_global_entry_free_ref(tt
);