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OpenCloudOS-Kernel/net/batman-adv/translation-table.c

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/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich, Antonio Quartulli
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#include "main.h"
#include "translation-table.h"
#include "soft-interface.h"
#include "hard-interface.h"
#include "send.h"
#include "hash.h"
#include "originator.h"
#include "routing.h"
#include "bridge_loop_avoidance.h"
#include <linux/crc16.h>
static void batadv_send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
struct orig_node *orig_node);
static void batadv_tt_purge(struct work_struct *work);
static void
batadv_tt_global_del_orig_list(struct tt_global_entry *tt_global_entry);
/* returns 1 if they are the same mac addr */
static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct tt_common_entry,
hash_entry);
return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}
static void batadv_tt_start_timer(struct bat_priv *bat_priv)
{
INIT_DELAYED_WORK(&bat_priv->tt_work, batadv_tt_purge);
queue_delayed_work(batadv_event_workqueue, &bat_priv->tt_work,
msecs_to_jiffies(5000));
}
static struct tt_common_entry *batadv_tt_hash_find(struct hashtable_t *hash,
const void *data)
{
struct hlist_head *head;
struct hlist_node *node;
struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL;
uint32_t index;
if (!hash)
return NULL;
index = batadv_choose_orig(data, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
if (!batadv_compare_eth(tt_common_entry, data))
continue;
if (!atomic_inc_not_zero(&tt_common_entry->refcount))
continue;
tt_common_entry_tmp = tt_common_entry;
break;
}
rcu_read_unlock();
return tt_common_entry_tmp;
}
static struct tt_local_entry *
batadv_tt_local_hash_find(struct bat_priv *bat_priv, const void *data)
{
struct tt_common_entry *tt_common_entry;
struct tt_local_entry *tt_local_entry = NULL;
tt_common_entry = batadv_tt_hash_find(bat_priv->tt_local_hash, data);
if (tt_common_entry)
tt_local_entry = container_of(tt_common_entry,
struct tt_local_entry, common);
return tt_local_entry;
}
static struct tt_global_entry *
batadv_tt_global_hash_find(struct bat_priv *bat_priv, const void *data)
{
struct tt_common_entry *tt_common_entry;
struct tt_global_entry *tt_global_entry = NULL;
tt_common_entry = batadv_tt_hash_find(bat_priv->tt_global_hash, data);
if (tt_common_entry)
tt_global_entry = container_of(tt_common_entry,
struct tt_global_entry, common);
return tt_global_entry;
}
static void
batadv_tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
{
if (atomic_dec_and_test(&tt_local_entry->common.refcount))
kfree_rcu(tt_local_entry, common.rcu);
}
static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
{
struct tt_common_entry *tt_common_entry;
struct tt_global_entry *tt_global_entry;
tt_common_entry = container_of(rcu, struct tt_common_entry, rcu);
tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
common);
kfree(tt_global_entry);
}
static void
batadv_tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
{
if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
batadv_tt_global_del_orig_list(tt_global_entry);
call_rcu(&tt_global_entry->common.rcu,
batadv_tt_global_entry_free_rcu);
}
}
static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
{
struct tt_orig_list_entry *orig_entry;
orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu);
batadv_orig_node_free_ref(orig_entry->orig_node);
kfree(orig_entry);
}
static void
batadv_tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry)
{
/* to avoid race conditions, immediately decrease the tt counter */
atomic_dec(&orig_entry->orig_node->tt_size);
call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
}
static void batadv_tt_local_event(struct bat_priv *bat_priv,
const uint8_t *addr, uint8_t flags)
{
struct tt_change_node *tt_change_node, *entry, *safe;
bool event_removed = false;
bool del_op_requested, del_op_entry;
tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
if (!tt_change_node)
return;
tt_change_node->change.flags = flags;
memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
del_op_requested = flags & TT_CLIENT_DEL;
/* check for ADD+DEL or DEL+ADD events */
spin_lock_bh(&bat_priv->tt_changes_list_lock);
list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
list) {
if (!batadv_compare_eth(entry->change.addr, addr))
continue;
/* DEL+ADD in the same orig interval have no effect and can be
* removed to avoid silly behaviour on the receiver side. The
* other way around (ADD+DEL) can happen in case of roaming of
* a client still in the NEW state. Roaming of NEW clients is
* now possible due to automatically recognition of "temporary"
* clients
*/
del_op_entry = entry->change.flags & TT_CLIENT_DEL;
if (!del_op_requested && del_op_entry)
goto del;
if (del_op_requested && !del_op_entry)
goto del;
continue;
del:
list_del(&entry->list);
kfree(entry);
event_removed = true;
goto unlock;
}
/* track the change in the OGMinterval list */
list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
unlock:
spin_unlock_bh(&bat_priv->tt_changes_list_lock);
if (event_removed)
atomic_dec(&bat_priv->tt_local_changes);
else
atomic_inc(&bat_priv->tt_local_changes);
}
int batadv_tt_len(int changes_num)
{
return changes_num * sizeof(struct tt_change);
}
static int batadv_tt_local_init(struct bat_priv *bat_priv)
{
if (bat_priv->tt_local_hash)
return 0;
bat_priv->tt_local_hash = batadv_hash_new(1024);
if (!bat_priv->tt_local_hash)
return -ENOMEM;
return 0;
}
void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
int ifindex)
{
struct bat_priv *bat_priv = netdev_priv(soft_iface);
struct tt_local_entry *tt_local_entry = NULL;
struct tt_global_entry *tt_global_entry = NULL;
struct hlist_head *head;
struct hlist_node *node;
struct tt_orig_list_entry *orig_entry;
int hash_added;
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
if (tt_local_entry) {
tt_local_entry->last_seen = jiffies;
/* possibly unset the TT_CLIENT_PENDING flag */
tt_local_entry->common.flags &= ~TT_CLIENT_PENDING;
goto out;
}
tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
if (!tt_local_entry)
goto out;
batadv_dbg(DBG_TT, bat_priv,
"Creating new local tt entry: %pM (ttvn: %d)\n", addr,
(uint8_t)atomic_read(&bat_priv->ttvn));
memcpy(tt_local_entry->common.addr, addr, ETH_ALEN);
tt_local_entry->common.flags = BATADV_NO_FLAGS;
if (batadv_is_wifi_iface(ifindex))
tt_local_entry->common.flags |= TT_CLIENT_WIFI;
atomic_set(&tt_local_entry->common.refcount, 2);
tt_local_entry->last_seen = jiffies;
/* the batman interface mac address should never be purged */
if (batadv_compare_eth(addr, soft_iface->dev_addr))
tt_local_entry->common.flags |= TT_CLIENT_NOPURGE;
/* The local entry has to be marked as NEW to avoid to send it in
* a full table response going out before the next ttvn increment
* (consistency check)
*/
tt_local_entry->common.flags |= TT_CLIENT_NEW;
hash_added = batadv_hash_add(bat_priv->tt_local_hash, batadv_compare_tt,
batadv_choose_orig,
&tt_local_entry->common,
&tt_local_entry->common.hash_entry);
if (unlikely(hash_added != 0)) {
/* remove the reference for the hash */
batadv_tt_local_entry_free_ref(tt_local_entry);
goto out;
}
batadv_tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
/* remove address from global hash if present */
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
/* Check whether it is a roaming! */
if (tt_global_entry) {
/* These node are probably going to update their tt table */
head = &tt_global_entry->orig_list;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
orig_entry->orig_node->tt_poss_change = true;
batadv_send_roam_adv(bat_priv,
tt_global_entry->common.addr,
orig_entry->orig_node);
}
rcu_read_unlock();
/* The global entry has to be marked as ROAMING and
* has to be kept for consistency purpose
*/
tt_global_entry->common.flags |= TT_CLIENT_ROAM;
tt_global_entry->roam_at = jiffies;
}
out:
if (tt_local_entry)
batadv_tt_local_entry_free_ref(tt_local_entry);
if (tt_global_entry)
batadv_tt_global_entry_free_ref(tt_global_entry);
}
static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len,
int new_packet_len)
{
unsigned char *new_buff;
new_buff = kmalloc(new_packet_len, GFP_ATOMIC);
/* keep old buffer if kmalloc should fail */
if (new_buff) {
memcpy(new_buff, *packet_buff, min_packet_len);
kfree(*packet_buff);
*packet_buff = new_buff;
*packet_buff_len = new_packet_len;
}
}
static void batadv_tt_prepare_packet_buff(struct bat_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len)
{
struct hard_iface *primary_if;
int req_len;
primary_if = batadv_primary_if_get_selected(bat_priv);
req_len = min_packet_len;
req_len += batadv_tt_len(atomic_read(&bat_priv->tt_local_changes));
/* if we have too many changes for one packet don't send any
* and wait for the tt table request which will be fragmented
*/
if ((!primary_if) || (req_len > primary_if->soft_iface->mtu))
req_len = min_packet_len;
batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
min_packet_len, req_len);
if (primary_if)
batadv_hardif_free_ref(primary_if);
}
static int batadv_tt_changes_fill_buff(struct bat_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len)
{
struct tt_change_node *entry, *safe;
int count = 0, tot_changes = 0, new_len;
unsigned char *tt_buff;
batadv_tt_prepare_packet_buff(bat_priv, packet_buff,
packet_buff_len, min_packet_len);
new_len = *packet_buff_len - min_packet_len;
tt_buff = *packet_buff + min_packet_len;
if (new_len > 0)
tot_changes = new_len / batadv_tt_len(1);
spin_lock_bh(&bat_priv->tt_changes_list_lock);
atomic_set(&bat_priv->tt_local_changes, 0);
list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
list) {
if (count < tot_changes) {
memcpy(tt_buff + batadv_tt_len(count),
&entry->change, sizeof(struct tt_change));
count++;
}
list_del(&entry->list);
kfree(entry);
}
spin_unlock_bh(&bat_priv->tt_changes_list_lock);
/* Keep the buffer for possible tt_request */
spin_lock_bh(&bat_priv->tt_buff_lock);
kfree(bat_priv->tt_buff);
bat_priv->tt_buff_len = 0;
bat_priv->tt_buff = NULL;
/* check whether this new OGM has no changes due to size problems */
if (new_len > 0) {
/* if kmalloc() fails we will reply with the full table
* instead of providing the diff
*/
bat_priv->tt_buff = kmalloc(new_len, GFP_ATOMIC);
if (bat_priv->tt_buff) {
memcpy(bat_priv->tt_buff, tt_buff, new_len);
bat_priv->tt_buff_len = new_len;
}
}
spin_unlock_bh(&bat_priv->tt_buff_lock);
return count;
}
int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct bat_priv *bat_priv = netdev_priv(net_dev);
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct tt_common_entry *tt_common_entry;
struct hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
uint32_t i;
int ret = 0;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if) {
ret = seq_printf(seq,
"BATMAN mesh %s disabled - please specify interfaces to enable it\n",
net_dev->name);
goto out;
}
if (primary_if->if_status != IF_ACTIVE) {
ret = seq_printf(seq,
"BATMAN mesh %s disabled - primary interface not active\n",
net_dev->name);
goto out;
}
seq_printf(seq,
"Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node,
head, hash_entry) {
seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
tt_common_entry->addr,
(tt_common_entry->flags &
TT_CLIENT_ROAM ? 'R' : '.'),
(tt_common_entry->flags &
TT_CLIENT_NOPURGE ? 'P' : '.'),
(tt_common_entry->flags &
TT_CLIENT_NEW ? 'N' : '.'),
(tt_common_entry->flags &
TT_CLIENT_PENDING ? 'X' : '.'),
(tt_common_entry->flags &
TT_CLIENT_WIFI ? 'W' : '.'));
}
rcu_read_unlock();
}
out:
if (primary_if)
batadv_hardif_free_ref(primary_if);
return ret;
}
static void batadv_tt_local_set_pending(struct bat_priv *bat_priv,
struct tt_local_entry *tt_local_entry,
uint16_t flags, const char *message)
{
batadv_tt_local_event(bat_priv, tt_local_entry->common.addr,
tt_local_entry->common.flags | flags);
/* The local client has to be marked as "pending to be removed" but has
* to be kept in the table in order to send it in a full table
* response issued before the net ttvn increment (consistency check)
*/
tt_local_entry->common.flags |= TT_CLIENT_PENDING;
batadv_dbg(DBG_TT, bat_priv,
"Local tt entry (%pM) pending to be removed: %s\n",
tt_local_entry->common.addr, message);
}
void batadv_tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
const char *message, bool roaming)
{
struct tt_local_entry *tt_local_entry = NULL;
uint16_t flags;
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
if (!tt_local_entry)
goto out;
flags = TT_CLIENT_DEL;
if (roaming)
flags |= TT_CLIENT_ROAM;
batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, message);
out:
if (tt_local_entry)
batadv_tt_local_entry_free_ref(tt_local_entry);
}
static void batadv_tt_local_purge(struct bat_priv *bat_priv)
{
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct tt_local_entry *tt_local_entry;
struct tt_common_entry *tt_common_entry;
struct hlist_node *node, *node_tmp;
struct hlist_head *head;
spinlock_t *list_lock; /* protects write access to the hash lists */
uint32_t i;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
head, hash_entry) {
tt_local_entry = container_of(tt_common_entry,
struct tt_local_entry,
common);
if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE)
continue;
/* entry already marked for deletion */
if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
continue;
if (!batadv_has_timed_out(tt_local_entry->last_seen,
BATADV_TT_LOCAL_TIMEOUT))
continue;
batadv_tt_local_set_pending(bat_priv, tt_local_entry,
TT_CLIENT_DEL, "timed out");
}
spin_unlock_bh(list_lock);
}
}
static void batadv_tt_local_table_free(struct bat_priv *bat_priv)
{
struct hashtable_t *hash;
spinlock_t *list_lock; /* protects write access to the hash lists */
struct tt_common_entry *tt_common_entry;
struct tt_local_entry *tt_local_entry;
struct hlist_node *node, *node_tmp;
struct hlist_head *head;
uint32_t i;
if (!bat_priv->tt_local_hash)
return;
hash = bat_priv->tt_local_hash;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
head, hash_entry) {
hlist_del_rcu(node);
tt_local_entry = container_of(tt_common_entry,
struct tt_local_entry,
common);
batadv_tt_local_entry_free_ref(tt_local_entry);
}
spin_unlock_bh(list_lock);
}
batadv_hash_destroy(hash);
bat_priv->tt_local_hash = NULL;
}
static int batadv_tt_global_init(struct bat_priv *bat_priv)
{
if (bat_priv->tt_global_hash)
return 0;
bat_priv->tt_global_hash = batadv_hash_new(1024);
if (!bat_priv->tt_global_hash)
return -ENOMEM;
return 0;
}
static void batadv_tt_changes_list_free(struct bat_priv *bat_priv)
{
struct tt_change_node *entry, *safe;
spin_lock_bh(&bat_priv->tt_changes_list_lock);
list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
list) {
list_del(&entry->list);
kfree(entry);
}
atomic_set(&bat_priv->tt_local_changes, 0);
spin_unlock_bh(&bat_priv->tt_changes_list_lock);
}
/* find out if an orig_node is already in the list of a tt_global_entry.
* returns 1 if found, 0 otherwise
*/
static bool batadv_tt_global_entry_has_orig(const struct tt_global_entry *entry,
const struct orig_node *orig_node)
{
struct tt_orig_list_entry *tmp_orig_entry;
const struct hlist_head *head;
struct hlist_node *node;
bool found = false;
rcu_read_lock();
head = &entry->orig_list;
hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
if (tmp_orig_entry->orig_node == orig_node) {
found = true;
break;
}
}
rcu_read_unlock();
return found;
}
static void
batadv_tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry,
struct orig_node *orig_node, int ttvn)
{
struct tt_orig_list_entry *orig_entry;
orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
if (!orig_entry)
return;
INIT_HLIST_NODE(&orig_entry->list);
atomic_inc(&orig_node->refcount);
atomic_inc(&orig_node->tt_size);
orig_entry->orig_node = orig_node;
orig_entry->ttvn = ttvn;
spin_lock_bh(&tt_global_entry->list_lock);
hlist_add_head_rcu(&orig_entry->list,
&tt_global_entry->orig_list);
spin_unlock_bh(&tt_global_entry->list_lock);
}
/* caller must hold orig_node refcount */
int batadv_tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
const unsigned char *tt_addr, uint8_t flags,
uint8_t ttvn)
{
struct tt_global_entry *tt_global_entry = NULL;
int ret = 0;
int hash_added;
struct tt_common_entry *common;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr);
if (!tt_global_entry) {
tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
if (!tt_global_entry)
goto out;
common = &tt_global_entry->common;
memcpy(common->addr, tt_addr, ETH_ALEN);
common->flags = flags;
tt_global_entry->roam_at = 0;
atomic_set(&common->refcount, 2);
INIT_HLIST_HEAD(&tt_global_entry->orig_list);
spin_lock_init(&tt_global_entry->list_lock);
hash_added = batadv_hash_add(bat_priv->tt_global_hash,
batadv_compare_tt,
batadv_choose_orig, common,
&common->hash_entry);
if (unlikely(hash_added != 0)) {
/* remove the reference for the hash */
batadv_tt_global_entry_free_ref(tt_global_entry);
goto out_remove;
}
batadv_tt_global_add_orig_entry(tt_global_entry, orig_node,
ttvn);
} else {
/* there is already a global entry, use this one. */
/* If there is the TT_CLIENT_ROAM flag set, there is only one
* originator left in the list and we previously received a
* delete + roaming change for this originator.
*
* We should first delete the old originator before adding the
* new one.
*/
if (tt_global_entry->common.flags & TT_CLIENT_ROAM) {
batadv_tt_global_del_orig_list(tt_global_entry);
tt_global_entry->common.flags &= ~TT_CLIENT_ROAM;
tt_global_entry->roam_at = 0;
}
if (!batadv_tt_global_entry_has_orig(tt_global_entry,
orig_node))
batadv_tt_global_add_orig_entry(tt_global_entry,
orig_node, ttvn);
}
batadv_dbg(DBG_TT, bat_priv,
"Creating new global tt entry: %pM (via %pM)\n",
tt_global_entry->common.addr, orig_node->orig);
out_remove:
/* remove address from local hash if present */
batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr,
"global tt received", flags & TT_CLIENT_ROAM);
ret = 1;
out:
if (tt_global_entry)
batadv_tt_global_entry_free_ref(tt_global_entry);
return ret;
}
/* print all orig nodes who announce the address for this global entry.
* it is assumed that the caller holds rcu_read_lock();
*/
static void
batadv_tt_global_print_entry(struct tt_global_entry *tt_global_entry,
struct seq_file *seq)
{
struct hlist_head *head;
struct hlist_node *node;
struct tt_orig_list_entry *orig_entry;
struct tt_common_entry *tt_common_entry;
uint16_t flags;
uint8_t last_ttvn;
tt_common_entry = &tt_global_entry->common;
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
flags = tt_common_entry->flags;
last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n",
tt_global_entry->common.addr, orig_entry->ttvn,
orig_entry->orig_node->orig, last_ttvn,
(flags & TT_CLIENT_ROAM ? 'R' : '.'),
(flags & TT_CLIENT_WIFI ? 'W' : '.'));
}
}
int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct bat_priv *bat_priv = netdev_priv(net_dev);
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct tt_common_entry *tt_common_entry;
struct tt_global_entry *tt_global_entry;
struct hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
uint32_t i;
int ret = 0;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if) {
ret = seq_printf(seq,
"BATMAN mesh %s disabled - please specify interfaces to enable it\n",
net_dev->name);
goto out;
}
if (primary_if->if_status != IF_ACTIVE) {
ret = seq_printf(seq,
"BATMAN mesh %s disabled - primary interface not active\n",
net_dev->name);
goto out;
}
seq_printf(seq,
"Globally announced TT entries received via the mesh %s\n",
net_dev->name);
seq_printf(seq, " %-13s %s %-15s %s %s\n",
"Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node,
head, hash_entry) {
tt_global_entry = container_of(tt_common_entry,
struct tt_global_entry,
common);
batadv_tt_global_print_entry(tt_global_entry, seq);
}
rcu_read_unlock();
}
out:
if (primary_if)
batadv_hardif_free_ref(primary_if);
return ret;
}
/* deletes the orig list of a tt_global_entry */
static void
batadv_tt_global_del_orig_list(struct tt_global_entry *tt_global_entry)
{
struct hlist_head *head;
struct hlist_node *node, *safe;
struct tt_orig_list_entry *orig_entry;
spin_lock_bh(&tt_global_entry->list_lock);
head = &tt_global_entry->orig_list;
hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
hlist_del_rcu(node);
batadv_tt_orig_list_entry_free_ref(orig_entry);
}
spin_unlock_bh(&tt_global_entry->list_lock);
}
static void
batadv_tt_global_del_orig_entry(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
struct orig_node *orig_node,
const char *message)
{
struct hlist_head *head;
struct hlist_node *node, *safe;
struct tt_orig_list_entry *orig_entry;
spin_lock_bh(&tt_global_entry->list_lock);
head = &tt_global_entry->orig_list;
hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
if (orig_entry->orig_node == orig_node) {
batadv_dbg(DBG_TT, bat_priv,
"Deleting %pM from global tt entry %pM: %s\n",
orig_node->orig,
tt_global_entry->common.addr, message);
hlist_del_rcu(node);
batadv_tt_orig_list_entry_free_ref(orig_entry);
}
}
spin_unlock_bh(&tt_global_entry->list_lock);
}
static void batadv_tt_global_del_struct(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
const char *message)
{
batadv_dbg(DBG_TT, bat_priv, "Deleting global tt entry %pM: %s\n",
tt_global_entry->common.addr, message);
batadv_hash_remove(bat_priv->tt_global_hash, batadv_compare_tt,
batadv_choose_orig, tt_global_entry->common.addr);
batadv_tt_global_entry_free_ref(tt_global_entry);
}
/* If the client is to be deleted, we check if it is the last origantor entry
* within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer,
* otherwise we simply remove the originator scheduled for deletion.
*/
static void
batadv_tt_global_del_roaming(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
struct orig_node *orig_node, const char *message)
{
bool last_entry = true;
struct hlist_head *head;
struct hlist_node *node;
struct tt_orig_list_entry *orig_entry;
/* no local entry exists, case 1:
* Check if this is the last one or if other entries exist.
*/
rcu_read_lock();
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
if (orig_entry->orig_node != orig_node) {
last_entry = false;
break;
}
}
rcu_read_unlock();
if (last_entry) {
/* its the last one, mark for roaming. */
tt_global_entry->common.flags |= TT_CLIENT_ROAM;
tt_global_entry->roam_at = jiffies;
} else
/* there is another entry, we can simply delete this
* one and can still use the other one.
*/
batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
orig_node, message);
}
static void batadv_tt_global_del(struct bat_priv *bat_priv,
struct orig_node *orig_node,
const unsigned char *addr,
const char *message, bool roaming)
{
struct tt_global_entry *tt_global_entry = NULL;
struct tt_local_entry *local_entry = NULL;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
if (!tt_global_entry)
goto out;
if (!roaming) {
batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
orig_node, message);
if (hlist_empty(&tt_global_entry->orig_list))
batadv_tt_global_del_struct(bat_priv, tt_global_entry,
message);
goto out;
}
/* if we are deleting a global entry due to a roam
* event, there are two possibilities:
* 1) the client roamed from node A to node B => if there
* is only one originator left for this client, we mark
* it with TT_CLIENT_ROAM, we start a timer and we
* wait for node B to claim it. In case of timeout
* the entry is purged.
*
* If there are other originators left, we directly delete
* the originator.
* 2) the client roamed to us => we can directly delete
* the global entry, since it is useless now.
*/
local_entry = batadv_tt_local_hash_find(bat_priv,
tt_global_entry->common.addr);
if (local_entry) {
/* local entry exists, case 2: client roamed to us. */
batadv_tt_global_del_orig_list(tt_global_entry);
batadv_tt_global_del_struct(bat_priv, tt_global_entry, message);
} else
/* no local entry exists, case 1: check for roaming */
batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
orig_node, message);
out:
if (tt_global_entry)
batadv_tt_global_entry_free_ref(tt_global_entry);
if (local_entry)
batadv_tt_local_entry_free_ref(local_entry);
}
void batadv_tt_global_del_orig(struct bat_priv *bat_priv,
struct orig_node *orig_node, const char *message)
{
struct tt_global_entry *global_entry;
struct tt_common_entry *tt_common_entry;
uint32_t i;
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct hlist_node *node, *safe;
struct hlist_head *head;
spinlock_t *list_lock; /* protects write access to the hash lists */
if (!hash)
return;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_common_entry, node, safe,
head, hash_entry) {
global_entry = container_of(tt_common_entry,
struct tt_global_entry,
common);
batadv_tt_global_del_orig_entry(bat_priv, global_entry,
orig_node, message);
if (hlist_empty(&global_entry->orig_list)) {
batadv_dbg(DBG_TT, bat_priv,
"Deleting global tt entry %pM: %s\n",
global_entry->common.addr, message);
hlist_del_rcu(node);
batadv_tt_global_entry_free_ref(global_entry);
}
}
spin_unlock_bh(list_lock);
}
orig_node->tt_initialised = false;
}
static void batadv_tt_global_roam_purge_list(struct bat_priv *bat_priv,
struct hlist_head *head)
{
struct tt_common_entry *tt_common_entry;
struct tt_global_entry *tt_global_entry;
struct hlist_node *node, *node_tmp;
hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head,
hash_entry) {
tt_global_entry = container_of(tt_common_entry,
struct tt_global_entry, common);
if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM))
continue;
if (!batadv_has_timed_out(tt_global_entry->roam_at,
BATADV_TT_CLIENT_ROAM_TIMEOUT))
continue;
batadv_dbg(DBG_TT, bat_priv,
"Deleting global tt entry (%pM): Roaming timeout\n",
tt_global_entry->common.addr);
hlist_del_rcu(node);
batadv_tt_global_entry_free_ref(tt_global_entry);
}
}
static void batadv_tt_global_roam_purge(struct bat_priv *bat_priv)
{
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct hlist_head *head;
spinlock_t *list_lock; /* protects write access to the hash lists */
uint32_t i;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
batadv_tt_global_roam_purge_list(bat_priv, head);
spin_unlock_bh(list_lock);
}
}
static void batadv_tt_global_table_free(struct bat_priv *bat_priv)
{
struct hashtable_t *hash;
spinlock_t *list_lock; /* protects write access to the hash lists */
struct tt_common_entry *tt_common_entry;
struct tt_global_entry *tt_global_entry;
struct hlist_node *node, *node_tmp;
struct hlist_head *head;
uint32_t i;
if (!bat_priv->tt_global_hash)
return;
hash = bat_priv->tt_global_hash;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
head, hash_entry) {
hlist_del_rcu(node);
tt_global_entry = container_of(tt_common_entry,
struct tt_global_entry,
common);
batadv_tt_global_entry_free_ref(tt_global_entry);
}
spin_unlock_bh(list_lock);
}
batadv_hash_destroy(hash);
bat_priv->tt_global_hash = NULL;
}
static bool _batadv_is_ap_isolated(struct tt_local_entry *tt_local_entry,
struct tt_global_entry *tt_global_entry)
{
bool ret = false;
if (tt_local_entry->common.flags & TT_CLIENT_WIFI &&
tt_global_entry->common.flags & TT_CLIENT_WIFI)
ret = true;
return ret;
}
struct orig_node *batadv_transtable_search(struct bat_priv *bat_priv,
const uint8_t *src,
const uint8_t *addr)
{
struct tt_local_entry *tt_local_entry = NULL;
struct tt_global_entry *tt_global_entry = NULL;
struct orig_node *orig_node = NULL;
struct neigh_node *router = NULL;
struct hlist_head *head;
struct hlist_node *node;
struct tt_orig_list_entry *orig_entry;
int best_tq;
if (src && atomic_read(&bat_priv->ap_isolation)) {
tt_local_entry = batadv_tt_local_hash_find(bat_priv, src);
if (!tt_local_entry)
goto out;
}
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
if (!tt_global_entry)
goto out;
/* check whether the clients should not communicate due to AP
* isolation
*/
if (tt_local_entry &&
_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
goto out;
best_tq = 0;
rcu_read_lock();
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
router = batadv_orig_node_get_router(orig_entry->orig_node);
if (!router)
continue;
if (router->tq_avg > best_tq) {
orig_node = orig_entry->orig_node;
best_tq = router->tq_avg;
}
batadv_neigh_node_free_ref(router);
}
/* found anything? */
if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
orig_node = NULL;
rcu_read_unlock();
out:
if (tt_global_entry)
batadv_tt_global_entry_free_ref(tt_global_entry);
if (tt_local_entry)
batadv_tt_local_entry_free_ref(tt_local_entry);
return orig_node;
}
/* Calculates the checksum of the local table of a given orig_node */
static uint16_t batadv_tt_global_crc(struct bat_priv *bat_priv,
struct orig_node *orig_node)
{
uint16_t total = 0, total_one;
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct tt_common_entry *tt_common_entry;
struct tt_global_entry *tt_global_entry;
struct hlist_node *node;
struct hlist_head *head;
uint32_t i;
int j;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node,
head, hash_entry) {
tt_global_entry = container_of(tt_common_entry,
struct tt_global_entry,
common);
/* Roaming clients are in the global table for
* consistency only. They don't have to be
* taken into account while computing the
* global crc
*/
if (tt_global_entry->common.flags & TT_CLIENT_ROAM)
continue;
/* find out if this global entry is announced by this
* originator
*/
if (!batadv_tt_global_entry_has_orig(tt_global_entry,
orig_node))
continue;
total_one = 0;
for (j = 0; j < ETH_ALEN; j++)
total_one = crc16_byte(total_one,
tt_global_entry->common.addr[j]);
total ^= total_one;
}
rcu_read_unlock();
}
return total;
}
/* Calculates the checksum of the local table */
static uint16_t batadv_tt_local_crc(struct bat_priv *bat_priv)
{
uint16_t total = 0, total_one;
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct tt_common_entry *tt_common_entry;
struct hlist_node *node;
struct hlist_head *head;
uint32_t i;
int j;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node,
head, hash_entry) {
/* not yet committed clients have not to be taken into
* account while computing the CRC
*/
if (tt_common_entry->flags & TT_CLIENT_NEW)
continue;
total_one = 0;
for (j = 0; j < ETH_ALEN; j++)
total_one = crc16_byte(total_one,
tt_common_entry->addr[j]);
total ^= total_one;
}
rcu_read_unlock();
}
return total;
}
static void batadv_tt_req_list_free(struct bat_priv *bat_priv)
{
struct tt_req_node *node, *safe;
spin_lock_bh(&bat_priv->tt_req_list_lock);
list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
list_del(&node->list);
kfree(node);
}
spin_unlock_bh(&bat_priv->tt_req_list_lock);
}
static void batadv_tt_save_orig_buffer(struct bat_priv *bat_priv,
struct orig_node *orig_node,
const unsigned char *tt_buff,
uint8_t tt_num_changes)
{
uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
/* Replace the old buffer only if I received something in the
* last OGM (the OGM could carry no changes)
*/
spin_lock_bh(&orig_node->tt_buff_lock);
if (tt_buff_len > 0) {
kfree(orig_node->tt_buff);
orig_node->tt_buff_len = 0;
orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
if (orig_node->tt_buff) {
memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
orig_node->tt_buff_len = tt_buff_len;
}
}
spin_unlock_bh(&orig_node->tt_buff_lock);
}
static void batadv_tt_req_purge(struct bat_priv *bat_priv)
{
struct tt_req_node *node, *safe;
spin_lock_bh(&bat_priv->tt_req_list_lock);
list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
if (batadv_has_timed_out(node->issued_at,
BATADV_TT_REQUEST_TIMEOUT)) {
list_del(&node->list);
kfree(node);
}
}
spin_unlock_bh(&bat_priv->tt_req_list_lock);
}
/* returns the pointer to the new tt_req_node struct if no request
* has already been issued for this orig_node, NULL otherwise
*/
static struct tt_req_node *batadv_new_tt_req_node(struct bat_priv *bat_priv,
struct orig_node *orig_node)
{
struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
spin_lock_bh(&bat_priv->tt_req_list_lock);
list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
!batadv_has_timed_out(tt_req_node_tmp->issued_at,
BATADV_TT_REQUEST_TIMEOUT))
goto unlock;
}
tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
if (!tt_req_node)
goto unlock;
memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
tt_req_node->issued_at = jiffies;
list_add(&tt_req_node->list, &bat_priv->tt_req_list);
unlock:
spin_unlock_bh(&bat_priv->tt_req_list_lock);
return tt_req_node;
}
/* data_ptr is useless here, but has to be kept to respect the prototype */
static int batadv_tt_local_valid_entry(const void *entry_ptr,
const void *data_ptr)
{
const struct tt_common_entry *tt_common_entry = entry_ptr;
if (tt_common_entry->flags & TT_CLIENT_NEW)
return 0;
return 1;
}
static int batadv_tt_global_valid(const void *entry_ptr,
const void *data_ptr)
{
const struct tt_common_entry *tt_common_entry = entry_ptr;
const struct tt_global_entry *tt_global_entry;
const struct orig_node *orig_node = data_ptr;
if (tt_common_entry->flags & TT_CLIENT_ROAM)
return 0;
tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
common);
return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
}
static struct sk_buff *
batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
struct hashtable_t *hash,
struct hard_iface *primary_if,
int (*valid_cb)(const void *, const void *),
void *cb_data)
{
struct tt_common_entry *tt_common_entry;
struct tt_query_packet *tt_response;
struct tt_change *tt_change;
struct hlist_node *node;
struct hlist_head *head;
struct sk_buff *skb = NULL;
uint16_t tt_tot, tt_count;
ssize_t tt_query_size = sizeof(struct tt_query_packet);
uint32_t i;
if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
tt_len = primary_if->soft_iface->mtu - tt_query_size;
tt_len -= tt_len % sizeof(struct tt_change);
}
tt_tot = tt_len / sizeof(struct tt_change);
skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
if (!skb)
goto out;
skb_reserve(skb, ETH_HLEN);
tt_response = (struct tt_query_packet *)skb_put(skb,
tt_query_size + tt_len);
tt_response->ttvn = ttvn;
tt_change = (struct tt_change *)(skb->data + tt_query_size);
tt_count = 0;
rcu_read_lock();
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
hlist_for_each_entry_rcu(tt_common_entry, node,
head, hash_entry) {
if (tt_count == tt_tot)
break;
if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
continue;
memcpy(tt_change->addr, tt_common_entry->addr,
ETH_ALEN);
tt_change->flags = BATADV_NO_FLAGS;
tt_count++;
tt_change++;
}
}
rcu_read_unlock();
/* store in the message the number of entries we have successfully
* copied
*/
tt_response->tt_data = htons(tt_count);
out:
return skb;
}
static int batadv_send_tt_request(struct bat_priv *bat_priv,
struct orig_node *dst_orig_node,
uint8_t ttvn, uint16_t tt_crc,
bool full_table)
{
struct sk_buff *skb = NULL;
struct tt_query_packet *tt_request;
struct neigh_node *neigh_node = NULL;
struct hard_iface *primary_if;
struct tt_req_node *tt_req_node = NULL;
int ret = 1;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if)
goto out;
/* The new tt_req will be issued only if I'm not waiting for a
* reply from the same orig_node yet
*/
tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
if (!tt_req_node)
goto out;
skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
if (!skb)
goto out;
skb_reserve(skb, ETH_HLEN);
tt_request = (struct tt_query_packet *)skb_put(skb,
sizeof(struct tt_query_packet));
tt_request->header.packet_type = BAT_TT_QUERY;
tt_request->header.version = BATADV_COMPAT_VERSION;
memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
tt_request->header.ttl = BATADV_TTL;
tt_request->ttvn = ttvn;
tt_request->tt_data = htons(tt_crc);
tt_request->flags = TT_REQUEST;
if (full_table)
tt_request->flags |= TT_FULL_TABLE;
neigh_node = batadv_orig_node_get_router(dst_orig_node);
if (!neigh_node)
goto out;
batadv_dbg(DBG_TT, bat_priv,
"Sending TT_REQUEST to %pM via %pM [%c]\n",
dst_orig_node->orig, neigh_node->addr,
(full_table ? 'F' : '.'));
batadv_inc_counter(bat_priv, BAT_CNT_TT_REQUEST_TX);
batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
ret = 0;
out:
if (neigh_node)
batadv_neigh_node_free_ref(neigh_node);
if (primary_if)
batadv_hardif_free_ref(primary_if);
if (ret)
kfree_skb(skb);
if (ret && tt_req_node) {
spin_lock_bh(&bat_priv->tt_req_list_lock);
list_del(&tt_req_node->list);
spin_unlock_bh(&bat_priv->tt_req_list_lock);
kfree(tt_req_node);
}
return ret;
}
static bool batadv_send_other_tt_response(struct bat_priv *bat_priv,
struct tt_query_packet *tt_request)
{
struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
struct neigh_node *neigh_node = NULL;
struct hard_iface *primary_if = NULL;
uint8_t orig_ttvn, req_ttvn, ttvn;
int ret = false;
unsigned char *tt_buff;
bool full_table;
uint16_t tt_len, tt_tot;
struct sk_buff *skb = NULL;
struct tt_query_packet *tt_response;
batadv_dbg(DBG_TT, bat_priv,
"Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
tt_request->src, tt_request->ttvn, tt_request->dst,
(tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
/* Let's get the orig node of the REAL destination */
req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst);
if (!req_dst_orig_node)
goto out;
res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
if (!res_dst_orig_node)
goto out;
neigh_node = batadv_orig_node_get_router(res_dst_orig_node);
if (!neigh_node)
goto out;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if)
goto out;
orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
req_ttvn = tt_request->ttvn;
/* I don't have the requested data */
if (orig_ttvn != req_ttvn ||
tt_request->tt_data != htons(req_dst_orig_node->tt_crc))
goto out;
/* If the full table has been explicitly requested */
if (tt_request->flags & TT_FULL_TABLE ||
!req_dst_orig_node->tt_buff)
full_table = true;
else
full_table = false;
/* In this version, fragmentation is not implemented, then
* I'll send only one packet with as much TT entries as I can
*/
if (!full_table) {
spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
tt_len = req_dst_orig_node->tt_buff_len;
tt_tot = tt_len / sizeof(struct tt_change);
skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
tt_len + ETH_HLEN);
if (!skb)
goto unlock;
skb_reserve(skb, ETH_HLEN);
tt_response = (struct tt_query_packet *)skb_put(skb,
sizeof(struct tt_query_packet) + tt_len);
tt_response->ttvn = req_ttvn;
tt_response->tt_data = htons(tt_tot);
tt_buff = skb->data + sizeof(struct tt_query_packet);
/* Copy the last orig_node's OGM buffer */
memcpy(tt_buff, req_dst_orig_node->tt_buff,
req_dst_orig_node->tt_buff_len);
spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
} else {
tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
sizeof(struct tt_change);
ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
skb = batadv_tt_response_fill_table(tt_len, ttvn,
bat_priv->tt_global_hash,
primary_if,
batadv_tt_global_valid,
req_dst_orig_node);
if (!skb)
goto out;
tt_response = (struct tt_query_packet *)skb->data;
}
tt_response->header.packet_type = BAT_TT_QUERY;
tt_response->header.version = BATADV_COMPAT_VERSION;
tt_response->header.ttl = BATADV_TTL;
memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
tt_response->flags = TT_RESPONSE;
if (full_table)
tt_response->flags |= TT_FULL_TABLE;
batadv_dbg(DBG_TT, bat_priv,
"Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
res_dst_orig_node->orig, neigh_node->addr,
req_dst_orig_node->orig, req_ttvn);
batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX);
batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
ret = true;
goto out;
unlock:
spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
out:
if (res_dst_orig_node)
batadv_orig_node_free_ref(res_dst_orig_node);
if (req_dst_orig_node)
batadv_orig_node_free_ref(req_dst_orig_node);
if (neigh_node)
batadv_neigh_node_free_ref(neigh_node);
if (primary_if)
batadv_hardif_free_ref(primary_if);
if (!ret)
kfree_skb(skb);
return ret;
}
static bool batadv_send_my_tt_response(struct bat_priv *bat_priv,
struct tt_query_packet *tt_request)
{
struct orig_node *orig_node = NULL;
struct neigh_node *neigh_node = NULL;
struct hard_iface *primary_if = NULL;
uint8_t my_ttvn, req_ttvn, ttvn;
int ret = false;
unsigned char *tt_buff;
bool full_table;
uint16_t tt_len, tt_tot;
struct sk_buff *skb = NULL;
struct tt_query_packet *tt_response;
batadv_dbg(DBG_TT, bat_priv,
"Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
tt_request->src, tt_request->ttvn,
(tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
req_ttvn = tt_request->ttvn;
orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
if (!orig_node)
goto out;
neigh_node = batadv_orig_node_get_router(orig_node);
if (!neigh_node)
goto out;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if)
goto out;
/* If the full table has been explicitly requested or the gap
* is too big send the whole local translation table
*/
if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
!bat_priv->tt_buff)
full_table = true;
else
full_table = false;
/* In this version, fragmentation is not implemented, then
* I'll send only one packet with as much TT entries as I can
*/
if (!full_table) {
spin_lock_bh(&bat_priv->tt_buff_lock);
tt_len = bat_priv->tt_buff_len;
tt_tot = tt_len / sizeof(struct tt_change);
skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
tt_len + ETH_HLEN);
if (!skb)
goto unlock;
skb_reserve(skb, ETH_HLEN);
tt_response = (struct tt_query_packet *)skb_put(skb,
sizeof(struct tt_query_packet) + tt_len);
tt_response->ttvn = req_ttvn;
tt_response->tt_data = htons(tt_tot);
tt_buff = skb->data + sizeof(struct tt_query_packet);
memcpy(tt_buff, bat_priv->tt_buff,
bat_priv->tt_buff_len);
spin_unlock_bh(&bat_priv->tt_buff_lock);
} else {
tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
sizeof(struct tt_change);
ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
skb = batadv_tt_response_fill_table(tt_len, ttvn,
bat_priv->tt_local_hash,
primary_if,
batadv_tt_local_valid_entry,
NULL);
if (!skb)
goto out;
tt_response = (struct tt_query_packet *)skb->data;
}
tt_response->header.packet_type = BAT_TT_QUERY;
tt_response->header.version = BATADV_COMPAT_VERSION;
tt_response->header.ttl = BATADV_TTL;
memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
tt_response->flags = TT_RESPONSE;
if (full_table)
tt_response->flags |= TT_FULL_TABLE;
batadv_dbg(DBG_TT, bat_priv,
"Sending TT_RESPONSE to %pM via %pM [%c]\n",
orig_node->orig, neigh_node->addr,
(tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX);
batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
ret = true;
goto out;
unlock:
spin_unlock_bh(&bat_priv->tt_buff_lock);
out:
if (orig_node)
batadv_orig_node_free_ref(orig_node);
if (neigh_node)
batadv_neigh_node_free_ref(neigh_node);
if (primary_if)
batadv_hardif_free_ref(primary_if);
if (!ret)
kfree_skb(skb);
/* This packet was for me, so it doesn't need to be re-routed */
return true;
}
bool batadv_send_tt_response(struct bat_priv *bat_priv,
struct tt_query_packet *tt_request)
{
if (batadv_is_my_mac(tt_request->dst)) {
/* don't answer backbone gws! */
if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src))
return true;
return batadv_send_my_tt_response(bat_priv, tt_request);
} else {
return batadv_send_other_tt_response(bat_priv, tt_request);
}
}
static void _batadv_tt_update_changes(struct bat_priv *bat_priv,
struct orig_node *orig_node,
struct tt_change *tt_change,
uint16_t tt_num_changes, uint8_t ttvn)
{
int i;
int roams;
for (i = 0; i < tt_num_changes; i++) {
if ((tt_change + i)->flags & TT_CLIENT_DEL) {
roams = (tt_change + i)->flags & TT_CLIENT_ROAM;
batadv_tt_global_del(bat_priv, orig_node,
(tt_change + i)->addr,
"tt removed by changes",
roams);
} else {
if (!batadv_tt_global_add(bat_priv, orig_node,
(tt_change + i)->addr,
(tt_change + i)->flags, ttvn))
/* In case of problem while storing a
* global_entry, we stop the updating
* procedure without committing the
* ttvn change. This will avoid to send
* corrupted data on tt_request
*/
return;
}
}
orig_node->tt_initialised = true;
}
static void batadv_tt_fill_gtable(struct bat_priv *bat_priv,
struct tt_query_packet *tt_response)
{
struct orig_node *orig_node = NULL;
orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
if (!orig_node)
goto out;
/* Purge the old table first.. */
batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table");
_batadv_tt_update_changes(bat_priv, orig_node,
(struct tt_change *)(tt_response + 1),
ntohs(tt_response->tt_data),
tt_response->ttvn);
spin_lock_bh(&orig_node->tt_buff_lock);
kfree(orig_node->tt_buff);
orig_node->tt_buff_len = 0;
orig_node->tt_buff = NULL;
spin_unlock_bh(&orig_node->tt_buff_lock);
atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
out:
if (orig_node)
batadv_orig_node_free_ref(orig_node);
}
static void batadv_tt_update_changes(struct bat_priv *bat_priv,
struct orig_node *orig_node,
uint16_t tt_num_changes, uint8_t ttvn,
struct tt_change *tt_change)
{
_batadv_tt_update_changes(bat_priv, orig_node, tt_change,
tt_num_changes, ttvn);
batadv_tt_save_orig_buffer(bat_priv, orig_node,
(unsigned char *)tt_change, tt_num_changes);
atomic_set(&orig_node->last_ttvn, ttvn);
}
bool batadv_is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
{
struct tt_local_entry *tt_local_entry = NULL;
bool ret = false;
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
if (!tt_local_entry)
goto out;
/* Check if the client has been logically deleted (but is kept for
* consistency purpose)
*/
if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
goto out;
ret = true;
out:
if (tt_local_entry)
batadv_tt_local_entry_free_ref(tt_local_entry);
return ret;
}
void batadv_handle_tt_response(struct bat_priv *bat_priv,
struct tt_query_packet *tt_response)
{
struct tt_req_node *node, *safe;
struct orig_node *orig_node = NULL;
batadv_dbg(DBG_TT, bat_priv,
"Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
tt_response->src, tt_response->ttvn,
ntohs(tt_response->tt_data),
(tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
/* we should have never asked a backbone gw */
if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src))
goto out;
orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
if (!orig_node)
goto out;
if (tt_response->flags & TT_FULL_TABLE)
batadv_tt_fill_gtable(bat_priv, tt_response);
else
batadv_tt_update_changes(bat_priv, orig_node,
ntohs(tt_response->tt_data),
tt_response->ttvn,
(struct tt_change *)(tt_response + 1));
/* Delete the tt_req_node from pending tt_requests list */
spin_lock_bh(&bat_priv->tt_req_list_lock);
list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
if (!batadv_compare_eth(node->addr, tt_response->src))
continue;
list_del(&node->list);
kfree(node);
}
spin_unlock_bh(&bat_priv->tt_req_list_lock);
/* Recalculate the CRC for this orig_node and store it */
orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
/* Roaming phase is over: tables are in sync again. I can
* unset the flag
*/
orig_node->tt_poss_change = false;
out:
if (orig_node)
batadv_orig_node_free_ref(orig_node);
}
int batadv_tt_init(struct bat_priv *bat_priv)
{
int ret;
ret = batadv_tt_local_init(bat_priv);
if (ret < 0)
return ret;
ret = batadv_tt_global_init(bat_priv);
if (ret < 0)
return ret;
batadv_tt_start_timer(bat_priv);
return 1;
}
static void batadv_tt_roam_list_free(struct bat_priv *bat_priv)
{
struct tt_roam_node *node, *safe;
spin_lock_bh(&bat_priv->tt_roam_list_lock);
list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
list_del(&node->list);
kfree(node);
}
spin_unlock_bh(&bat_priv->tt_roam_list_lock);
}
static void batadv_tt_roam_purge(struct bat_priv *bat_priv)
{
struct tt_roam_node *node, *safe;
spin_lock_bh(&bat_priv->tt_roam_list_lock);
list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
if (!batadv_has_timed_out(node->first_time,
BATADV_ROAMING_MAX_TIME))
continue;
list_del(&node->list);
kfree(node);
}
spin_unlock_bh(&bat_priv->tt_roam_list_lock);
}
/* This function checks whether the client already reached the
* maximum number of possible roaming phases. In this case the ROAMING_ADV
* will not be sent.
*
* returns true if the ROAMING_ADV can be sent, false otherwise
*/
static bool batadv_tt_check_roam_count(struct bat_priv *bat_priv,
uint8_t *client)
{
struct tt_roam_node *tt_roam_node;
bool ret = false;
spin_lock_bh(&bat_priv->tt_roam_list_lock);
/* The new tt_req will be issued only if I'm not waiting for a
* reply from the same orig_node yet
*/
list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
if (!batadv_compare_eth(tt_roam_node->addr, client))
continue;
if (batadv_has_timed_out(tt_roam_node->first_time,
BATADV_ROAMING_MAX_TIME))
continue;
if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
/* Sorry, you roamed too many times! */
goto unlock;
ret = true;
break;
}
if (!ret) {
tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
if (!tt_roam_node)
goto unlock;
tt_roam_node->first_time = jiffies;
atomic_set(&tt_roam_node->counter,
BATADV_ROAMING_MAX_COUNT - 1);
memcpy(tt_roam_node->addr, client, ETH_ALEN);
list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
ret = true;
}
unlock:
spin_unlock_bh(&bat_priv->tt_roam_list_lock);
return ret;
}
static void batadv_send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
struct orig_node *orig_node)
{
struct neigh_node *neigh_node = NULL;
struct sk_buff *skb = NULL;
struct roam_adv_packet *roam_adv_packet;
int ret = 1;
struct hard_iface *primary_if;
/* before going on we have to check whether the client has
* already roamed to us too many times
*/
if (!batadv_tt_check_roam_count(bat_priv, client))
goto out;
skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
if (!skb)
goto out;
skb_reserve(skb, ETH_HLEN);
roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
sizeof(struct roam_adv_packet));
roam_adv_packet->header.packet_type = BAT_ROAM_ADV;
roam_adv_packet->header.version = BATADV_COMPAT_VERSION;
roam_adv_packet->header.ttl = BATADV_TTL;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if)
goto out;
memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
batadv_hardif_free_ref(primary_if);
memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
memcpy(roam_adv_packet->client, client, ETH_ALEN);
neigh_node = batadv_orig_node_get_router(orig_node);
if (!neigh_node)
goto out;
batadv_dbg(DBG_TT, bat_priv,
"Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
orig_node->orig, client, neigh_node->addr);
batadv_inc_counter(bat_priv, BAT_CNT_TT_ROAM_ADV_TX);
batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
ret = 0;
out:
if (neigh_node)
batadv_neigh_node_free_ref(neigh_node);
if (ret)
kfree_skb(skb);
return;
}
static void batadv_tt_purge(struct work_struct *work)
{
struct delayed_work *delayed_work =
container_of(work, struct delayed_work, work);
struct bat_priv *bat_priv =
container_of(delayed_work, struct bat_priv, tt_work);
batadv_tt_local_purge(bat_priv);
batadv_tt_global_roam_purge(bat_priv);
batadv_tt_req_purge(bat_priv);
batadv_tt_roam_purge(bat_priv);
batadv_tt_start_timer(bat_priv);
}
void batadv_tt_free(struct bat_priv *bat_priv)
{
cancel_delayed_work_sync(&bat_priv->tt_work);
batadv_tt_local_table_free(bat_priv);
batadv_tt_global_table_free(bat_priv);
batadv_tt_req_list_free(bat_priv);
batadv_tt_changes_list_free(bat_priv);
batadv_tt_roam_list_free(bat_priv);
kfree(bat_priv->tt_buff);
}
/* This function will enable or disable the specified flags for all the entries
* in the given hash table and returns the number of modified entries
*/
static uint16_t batadv_tt_set_flags(struct hashtable_t *hash, uint16_t flags,
bool enable)
{
uint32_t i;
uint16_t changed_num = 0;
struct hlist_head *head;
struct hlist_node *node;
struct tt_common_entry *tt_common_entry;
if (!hash)
goto out;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node,
head, hash_entry) {
if (enable) {
if ((tt_common_entry->flags & flags) == flags)
continue;
tt_common_entry->flags |= flags;
} else {
if (!(tt_common_entry->flags & flags))
continue;
tt_common_entry->flags &= ~flags;
}
changed_num++;
}
rcu_read_unlock();
}
out:
return changed_num;
}
/* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
static void batadv_tt_local_purge_pending_clients(struct bat_priv *bat_priv)
{
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct tt_common_entry *tt_common_entry;
struct tt_local_entry *tt_local_entry;
struct hlist_node *node, *node_tmp;
struct hlist_head *head;
spinlock_t *list_lock; /* protects write access to the hash lists */
uint32_t i;
if (!hash)
return;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
head, hash_entry) {
if (!(tt_common_entry->flags & TT_CLIENT_PENDING))
continue;
batadv_dbg(DBG_TT, bat_priv,
"Deleting local tt entry (%pM): pending\n",
tt_common_entry->addr);
atomic_dec(&bat_priv->num_local_tt);
hlist_del_rcu(node);
tt_local_entry = container_of(tt_common_entry,
struct tt_local_entry,
common);
batadv_tt_local_entry_free_ref(tt_local_entry);
}
spin_unlock_bh(list_lock);
}
}
static int batadv_tt_commit_changes(struct bat_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len, int packet_min_len)
{
uint16_t changed_num = 0;
if (atomic_read(&bat_priv->tt_local_changes) < 1)
return -ENOENT;
changed_num = batadv_tt_set_flags(bat_priv->tt_local_hash,
TT_CLIENT_NEW, false);
/* all reset entries have to be counted as local entries */
atomic_add(changed_num, &bat_priv->num_local_tt);
batadv_tt_local_purge_pending_clients(bat_priv);
bat_priv->tt_crc = batadv_tt_local_crc(bat_priv);
/* Increment the TTVN only once per OGM interval */
atomic_inc(&bat_priv->ttvn);
batadv_dbg(DBG_TT, bat_priv,
"Local changes committed, updating to ttvn %u\n",
(uint8_t)atomic_read(&bat_priv->ttvn));
bat_priv->tt_poss_change = false;
/* reset the sending counter */
atomic_set(&bat_priv->tt_ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
return batadv_tt_changes_fill_buff(bat_priv, packet_buff,
packet_buff_len, packet_min_len);
}
/* when calling this function (hard_iface == primary_if) has to be true */
int batadv_tt_append_diff(struct bat_priv *bat_priv,
unsigned char **packet_buff, int *packet_buff_len,
int packet_min_len)
{
int tt_num_changes;
/* if at least one change happened */
tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff,
packet_buff_len,
packet_min_len);
/* if the changes have been sent often enough */
if ((tt_num_changes < 0) &&
(!batadv_atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))) {
batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
packet_min_len, packet_min_len);
tt_num_changes = 0;
}
return tt_num_changes;
}
bool batadv_is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src,
uint8_t *dst)
{
struct tt_local_entry *tt_local_entry = NULL;
struct tt_global_entry *tt_global_entry = NULL;
bool ret = false;
if (!atomic_read(&bat_priv->ap_isolation))
goto out;
tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst);
if (!tt_local_entry)
goto out;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, src);
if (!tt_global_entry)
goto out;
if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
goto out;
ret = true;
out:
if (tt_global_entry)
batadv_tt_global_entry_free_ref(tt_global_entry);
if (tt_local_entry)
batadv_tt_local_entry_free_ref(tt_local_entry);
return ret;
}
void batadv_tt_update_orig(struct bat_priv *bat_priv,
struct orig_node *orig_node,
const unsigned char *tt_buff, uint8_t tt_num_changes,
uint8_t ttvn, uint16_t tt_crc)
{
uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
bool full_table = true;
/* don't care about a backbone gateways updates. */
if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
return;
/* orig table not initialised AND first diff is in the OGM OR the ttvn
* increased by one -> we can apply the attached changes
*/
if ((!orig_node->tt_initialised && ttvn == 1) ||
ttvn - orig_ttvn == 1) {
/* the OGM could not contain the changes due to their size or
* because they have already been sent BATADV_TT_OGM_APPEND_MAX
* times.
* In this case send a tt request
*/
if (!tt_num_changes) {
full_table = false;
goto request_table;
}
batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
ttvn, (struct tt_change *)tt_buff);
/* Even if we received the precomputed crc with the OGM, we
* prefer to recompute it to spot any possible inconsistency
* in the global table
*/
orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
/* The ttvn alone is not enough to guarantee consistency
* because a single value could represent different states
* (due to the wrap around). Thus a node has to check whether
* the resulting table (after applying the changes) is still
* consistent or not. E.g. a node could disconnect while its
* ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
* checking the CRC value is mandatory to detect the
* inconsistency
*/
if (orig_node->tt_crc != tt_crc)
goto request_table;
/* Roaming phase is over: tables are in sync again. I can
* unset the flag
*/
orig_node->tt_poss_change = false;
} else {
/* if we missed more than one change or our tables are not
* in sync anymore -> request fresh tt data
*/
if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
orig_node->tt_crc != tt_crc) {
request_table:
batadv_dbg(DBG_TT, bat_priv,
"TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
orig_node->orig, ttvn, orig_ttvn, tt_crc,
orig_node->tt_crc, tt_num_changes);
batadv_send_tt_request(bat_priv, orig_node, ttvn,
tt_crc, full_table);
return;
}
}
}
/* returns true whether we know that the client has moved from its old
* originator to another one. This entry is kept is still kept for consistency
* purposes
*/
bool batadv_tt_global_client_is_roaming(struct bat_priv *bat_priv,
uint8_t *addr)
{
struct tt_global_entry *tt_global_entry;
bool ret = false;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
if (!tt_global_entry)
goto out;
ret = tt_global_entry->common.flags & TT_CLIENT_ROAM;
batadv_tt_global_entry_free_ref(tt_global_entry);
out:
return ret;
}
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