linux/net/batman-adv/translation-table.c
Antonio Quartulli cc47f66e6b batman-adv: improved roaming mechanism
With the current client announcement implementation, in case of roaming,
an update is triggered on the new AP serving the client. At that point
the new information is spread around by means of the OGM broadcasting
mechanism. Until this operations is not executed, no node is able to
correctly route traffic towards the client. This obviously causes packet
drops and introduces a delay in the time needed by the client to recover
its connections.

A new packet type called ROAMING_ADVERTISEMENT is added to account this
issue.

This message is sent in case of roaming from the new AP serving the
client to the old one and will contain the client MAC address. In this
way an out-of-OGM update is immediately committed, so that the old node
can update its global translation table. Traffic reaching this node will
then be redirected to the correct destination utilising the fresher
information. Thus reducing the packet drops and the connection recovery
delay.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-06-20 11:37:27 +02:00

1600 lines
41 KiB
C

/*
* Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* 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 <linux/crc16.h>
static void _tt_global_del(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
const char *message);
static void tt_purge(struct work_struct *work);
/* returns 1 if they are the same mac addr */
static int compare_ltt(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct tt_local_entry,
hash_entry);
return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}
/* returns 1 if they are the same mac addr */
static int compare_gtt(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct tt_global_entry,
hash_entry);
return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}
static void tt_start_timer(struct bat_priv *bat_priv)
{
INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
msecs_to_jiffies(5000));
}
static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
const void *data)
{
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct hlist_head *head;
struct hlist_node *node;
struct tt_local_entry *tt_local_entry, *tt_local_entry_tmp = NULL;
int index;
if (!hash)
return NULL;
index = choose_orig(data, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_local_entry, node, head, hash_entry) {
if (!compare_eth(tt_local_entry, data))
continue;
tt_local_entry_tmp = tt_local_entry;
break;
}
rcu_read_unlock();
return tt_local_entry_tmp;
}
static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
const void *data)
{
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct hlist_head *head;
struct hlist_node *node;
struct tt_global_entry *tt_global_entry;
struct tt_global_entry *tt_global_entry_tmp = NULL;
int index;
if (!hash)
return NULL;
index = choose_orig(data, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_global_entry, node, head, hash_entry) {
if (!compare_eth(tt_global_entry, data))
continue;
tt_global_entry_tmp = tt_global_entry;
break;
}
rcu_read_unlock();
return tt_global_entry_tmp;
}
static bool is_out_of_time(unsigned long starting_time, unsigned long timeout)
{
unsigned long deadline;
deadline = starting_time + msecs_to_jiffies(timeout);
return time_after(jiffies, deadline);
}
static void tt_local_event(struct bat_priv *bat_priv, uint8_t op,
const uint8_t *addr, uint8_t roaming)
{
struct tt_change_node *tt_change_node;
tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
if (!tt_change_node)
return;
tt_change_node->change.flags = op;
if (roaming)
tt_change_node->change.flags |= TT_CLIENT_ROAM;
memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
spin_lock_bh(&bat_priv->tt_changes_list_lock);
/* track the change in the OGMinterval list */
list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
atomic_inc(&bat_priv->tt_local_changes);
spin_unlock_bh(&bat_priv->tt_changes_list_lock);
atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
}
int tt_len(int changes_num)
{
return changes_num * sizeof(struct tt_change);
}
static int tt_local_init(struct bat_priv *bat_priv)
{
if (bat_priv->tt_local_hash)
return 1;
bat_priv->tt_local_hash = hash_new(1024);
if (!bat_priv->tt_local_hash)
return 0;
return 1;
}
void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
{
struct bat_priv *bat_priv = netdev_priv(soft_iface);
struct tt_local_entry *tt_local_entry;
struct tt_global_entry *tt_global_entry;
uint8_t roam_addr[ETH_ALEN];
spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);
if (tt_local_entry) {
tt_local_entry->last_seen = jiffies;
goto unlock;
}
tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
if (!tt_local_entry)
goto unlock;
tt_local_event(bat_priv, NO_FLAGS, addr, false);
bat_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->addr, addr, ETH_ALEN);
tt_local_entry->last_seen = jiffies;
/* the batman interface mac address should never be purged */
if (compare_eth(addr, soft_iface->dev_addr))
tt_local_entry->never_purge = 1;
else
tt_local_entry->never_purge = 0;
hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
tt_local_entry, &tt_local_entry->hash_entry);
atomic_inc(&bat_priv->num_local_tt);
spin_unlock_bh(&bat_priv->tt_lhash_lock);
/* remove address from global hash if present */
spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, addr);
/* Check whether it is a roaming! */
if (tt_global_entry) {
memcpy(roam_addr, tt_global_entry->addr, ETH_ALEN);
/* This node is probably going to update its tt table */
tt_global_entry->orig_node->tt_poss_change = true;
_tt_global_del(bat_priv, tt_global_entry,
"local tt received");
spin_unlock_bh(&bat_priv->tt_ghash_lock);
send_roam_adv(bat_priv, tt_global_entry->addr,
tt_global_entry->orig_node);
} else
spin_unlock_bh(&bat_priv->tt_ghash_lock);
return;
unlock:
spin_unlock_bh(&bat_priv->tt_lhash_lock);
}
int tt_changes_fill_buffer(struct bat_priv *bat_priv,
unsigned char *buff, int buff_len)
{
int count = 0, tot_changes = 0;
struct tt_change_node *entry, *safe;
if (buff_len > 0)
tot_changes = buff_len / 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(buff + 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;
/* We check whether this new OGM has no changes due to size
* problems */
if (buff_len > 0) {
/**
* if kmalloc() fails we will reply with the full table
* instead of providing the diff
*/
bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
if (bat_priv->tt_buff) {
memcpy(bat_priv->tt_buff, buff, buff_len);
bat_priv->tt_buff_len = buff_len;
}
}
spin_unlock_bh(&bat_priv->tt_buff_lock);
return tot_changes;
}
int 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_local_entry *tt_local_entry;
struct hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
size_t buf_size, pos;
char *buff;
int i, ret = 0;
primary_if = 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));
spin_lock_bh(&bat_priv->tt_lhash_lock);
buf_size = 1;
/* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
__hlist_for_each_rcu(node, head)
buf_size += 21;
rcu_read_unlock();
}
buff = kmalloc(buf_size, GFP_ATOMIC);
if (!buff) {
spin_unlock_bh(&bat_priv->tt_lhash_lock);
ret = -ENOMEM;
goto out;
}
buff[0] = '\0';
pos = 0;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_local_entry, node,
head, hash_entry) {
pos += snprintf(buff + pos, 22, " * %pM\n",
tt_local_entry->addr);
}
rcu_read_unlock();
}
spin_unlock_bh(&bat_priv->tt_lhash_lock);
seq_printf(seq, "%s", buff);
kfree(buff);
out:
if (primary_if)
hardif_free_ref(primary_if);
return ret;
}
static void tt_local_entry_free(struct hlist_node *node, void *arg)
{
struct bat_priv *bat_priv = arg;
void *data = container_of(node, struct tt_local_entry, hash_entry);
kfree(data);
atomic_dec(&bat_priv->num_local_tt);
}
static void tt_local_del(struct bat_priv *bat_priv,
struct tt_local_entry *tt_local_entry,
const char *message)
{
bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry (%pM): %s\n",
tt_local_entry->addr, message);
atomic_dec(&bat_priv->num_local_tt);
hash_remove(bat_priv->tt_local_hash, compare_ltt, choose_orig,
tt_local_entry->addr);
tt_local_entry_free(&tt_local_entry->hash_entry, bat_priv);
}
void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
const char *message, bool roaming)
{
struct tt_local_entry *tt_local_entry;
spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);
if (tt_local_entry) {
tt_local_event(bat_priv, TT_CHANGE_DEL, tt_local_entry->addr,
roaming);
tt_local_del(bat_priv, tt_local_entry, message);
}
spin_unlock_bh(&bat_priv->tt_lhash_lock);
}
static void 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 hlist_node *node, *node_tmp;
struct hlist_head *head;
int i;
spin_lock_bh(&bat_priv->tt_lhash_lock);
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
head, hash_entry) {
if (tt_local_entry->never_purge)
continue;
if (!is_out_of_time(tt_local_entry->last_seen,
TT_LOCAL_TIMEOUT * 1000))
continue;
tt_local_event(bat_priv, TT_CHANGE_DEL,
tt_local_entry->addr, false);
tt_local_del(bat_priv, tt_local_entry,
"address timed out");
}
}
spin_unlock_bh(&bat_priv->tt_lhash_lock);
}
static void tt_local_table_free(struct bat_priv *bat_priv)
{
struct hashtable_t *hash;
int i;
spinlock_t *list_lock; /* protects write access to the hash lists */
struct hlist_head *head;
struct hlist_node *node, *node_tmp;
struct tt_local_entry *tt_local_entry;
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_local_entry, node, node_tmp,
head, hash_entry) {
hlist_del_rcu(node);
kfree(tt_local_entry);
}
spin_unlock_bh(list_lock);
}
hash_destroy(hash);
bat_priv->tt_local_hash = NULL;
}
static int tt_global_init(struct bat_priv *bat_priv)
{
if (bat_priv->tt_global_hash)
return 1;
bat_priv->tt_global_hash = hash_new(1024);
if (!bat_priv->tt_global_hash)
return 0;
return 1;
}
static void 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);
}
/* caller must hold orig_node refcount */
int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
const unsigned char *tt_addr, uint8_t ttvn, bool roaming)
{
struct tt_global_entry *tt_global_entry;
struct tt_local_entry *tt_local_entry;
struct orig_node *orig_node_tmp;
spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
if (!tt_global_entry) {
tt_global_entry =
kmalloc(sizeof(*tt_global_entry),
GFP_ATOMIC);
if (!tt_global_entry)
goto unlock;
memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN);
/* Assign the new orig_node */
atomic_inc(&orig_node->refcount);
tt_global_entry->orig_node = orig_node;
tt_global_entry->ttvn = ttvn;
tt_global_entry->flags = NO_FLAGS;
tt_global_entry->roam_at = 0;
atomic_inc(&orig_node->tt_size);
hash_add(bat_priv->tt_global_hash, compare_gtt,
choose_orig, tt_global_entry,
&tt_global_entry->hash_entry);
} else {
if (tt_global_entry->orig_node != orig_node) {
atomic_dec(&tt_global_entry->orig_node->tt_size);
orig_node_tmp = tt_global_entry->orig_node;
atomic_inc(&orig_node->refcount);
tt_global_entry->orig_node = orig_node;
orig_node_free_ref(orig_node_tmp);
atomic_inc(&orig_node->tt_size);
}
tt_global_entry->ttvn = ttvn;
tt_global_entry->flags = NO_FLAGS;
tt_global_entry->roam_at = 0;
}
spin_unlock_bh(&bat_priv->tt_ghash_lock);
bat_dbg(DBG_TT, bat_priv,
"Creating new global tt entry: %pM (via %pM)\n",
tt_global_entry->addr, orig_node->orig);
/* remove address from local hash if present */
spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, tt_addr);
if (tt_local_entry)
tt_local_remove(bat_priv, tt_global_entry->addr,
"global tt received", roaming);
spin_unlock_bh(&bat_priv->tt_lhash_lock);
return 1;
unlock:
spin_unlock_bh(&bat_priv->tt_ghash_lock);
return 0;
}
int 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_global_entry *tt_global_entry;
struct hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
size_t buf_size, pos;
char *buff;
int i, ret = 0;
primary_if = 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\n",
"Client", "(TTVN)", "Originator", "(Curr TTVN)");
spin_lock_bh(&bat_priv->tt_ghash_lock);
buf_size = 1;
/* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
* xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
__hlist_for_each_rcu(node, head)
buf_size += 59;
rcu_read_unlock();
}
buff = kmalloc(buf_size, GFP_ATOMIC);
if (!buff) {
spin_unlock_bh(&bat_priv->tt_ghash_lock);
ret = -ENOMEM;
goto out;
}
buff[0] = '\0';
pos = 0;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_global_entry, node,
head, hash_entry) {
pos += snprintf(buff + pos, 61,
" * %pM (%3u) via %pM (%3u)\n",
tt_global_entry->addr,
tt_global_entry->ttvn,
tt_global_entry->orig_node->orig,
(uint8_t) atomic_read(
&tt_global_entry->orig_node->
last_ttvn));
}
rcu_read_unlock();
}
spin_unlock_bh(&bat_priv->tt_ghash_lock);
seq_printf(seq, "%s", buff);
kfree(buff);
out:
if (primary_if)
hardif_free_ref(primary_if);
return ret;
}
static void _tt_global_del(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
const char *message)
{
if (!tt_global_entry)
return;
bat_dbg(DBG_TT, bat_priv,
"Deleting global tt entry %pM (via %pM): %s\n",
tt_global_entry->addr, tt_global_entry->orig_node->orig,
message);
atomic_dec(&tt_global_entry->orig_node->tt_size);
hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
tt_global_entry->addr);
kfree(tt_global_entry);
}
void 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;
spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, addr);
if (tt_global_entry && tt_global_entry->orig_node == orig_node) {
if (roaming) {
tt_global_entry->flags |= TT_CLIENT_ROAM;
tt_global_entry->roam_at = jiffies;
goto out;
}
atomic_dec(&orig_node->tt_size);
_tt_global_del(bat_priv, tt_global_entry, message);
}
out:
spin_unlock_bh(&bat_priv->tt_ghash_lock);
}
void tt_global_del_orig(struct bat_priv *bat_priv,
struct orig_node *orig_node, const char *message)
{
struct tt_global_entry *tt_global_entry;
int i;
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct hlist_node *node, *safe;
struct hlist_head *head;
if (!bat_priv->tt_global_hash)
return;
spin_lock_bh(&bat_priv->tt_ghash_lock);
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
hlist_for_each_entry_safe(tt_global_entry, node, safe,
head, hash_entry) {
if (tt_global_entry->orig_node == orig_node)
_tt_global_del(bat_priv, tt_global_entry,
message);
}
}
atomic_set(&orig_node->tt_size, 0);
spin_unlock_bh(&bat_priv->tt_ghash_lock);
}
static void tt_global_entry_free(struct hlist_node *node, void *arg)
{
void *data = container_of(node, struct tt_global_entry, hash_entry);
kfree(data);
}
static void tt_global_roam_purge(struct bat_priv *bat_priv)
{
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct tt_global_entry *tt_global_entry;
struct hlist_node *node, *node_tmp;
struct hlist_head *head;
int i;
spin_lock_bh(&bat_priv->tt_ghash_lock);
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
head, hash_entry) {
if (!(tt_global_entry->flags & TT_CLIENT_ROAM))
continue;
if (!is_out_of_time(tt_global_entry->roam_at,
TT_CLIENT_ROAM_TIMEOUT * 1000))
continue;
_tt_global_del(bat_priv, tt_global_entry,
"Roaming timeout");
}
}
spin_unlock_bh(&bat_priv->tt_ghash_lock);
}
static void tt_global_table_free(struct bat_priv *bat_priv)
{
if (!bat_priv->tt_global_hash)
return;
hash_delete(bat_priv->tt_global_hash, tt_global_entry_free, NULL);
bat_priv->tt_global_hash = NULL;
}
struct orig_node *transtable_search(struct bat_priv *bat_priv,
const uint8_t *addr)
{
struct tt_global_entry *tt_global_entry;
struct orig_node *orig_node = NULL;
spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, addr);
if (!tt_global_entry)
goto out;
if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
goto out;
orig_node = tt_global_entry->orig_node;
out:
spin_unlock_bh(&bat_priv->tt_ghash_lock);
return orig_node;
}
/* Calculates the checksum of the local table of a given orig_node */
uint16_t 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_global_entry *tt_global_entry;
struct hlist_node *node;
struct hlist_head *head;
int i, j;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_global_entry, node,
head, hash_entry) {
if (compare_eth(tt_global_entry->orig_node,
orig_node)) {
/* 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->flags & TT_CLIENT_ROAM)
continue;
total_one = 0;
for (j = 0; j < ETH_ALEN; j++)
total_one = crc16_byte(total_one,
tt_global_entry->addr[j]);
total ^= total_one;
}
}
rcu_read_unlock();
}
return total;
}
/* Calculates the checksum of the local table */
uint16_t 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_local_entry *tt_local_entry;
struct hlist_node *node;
struct hlist_head *head;
int i, j;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_local_entry, node,
head, hash_entry) {
total_one = 0;
for (j = 0; j < ETH_ALEN; j++)
total_one = crc16_byte(total_one,
tt_local_entry->addr[j]);
total ^= total_one;
}
rcu_read_unlock();
}
return total;
}
static void 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);
}
void 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 = 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 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 (is_out_of_time(node->issued_at,
TT_REQUEST_TIMEOUT * 1000)) {
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 *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 (compare_eth(tt_req_node_tmp, orig_node) &&
!is_out_of_time(tt_req_node_tmp->issued_at,
TT_REQUEST_TIMEOUT * 1000))
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;
}
static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
{
const struct tt_global_entry *tt_global_entry = entry_ptr;
const struct orig_node *orig_node = data_ptr;
if (tt_global_entry->flags & TT_CLIENT_ROAM)
return 0;
return (tt_global_entry->orig_node == orig_node);
}
static struct sk_buff *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_local_entry *tt_local_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);
int 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_response->tt_data = htons(tt_tot);
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_local_entry, node,
head, hash_entry) {
if (tt_count == tt_tot)
break;
if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data)))
continue;
memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN);
tt_change->flags = NO_FLAGS;
tt_count++;
tt_change++;
}
}
rcu_read_unlock();
out:
return skb;
}
int 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 = 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 = 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->packet_type = BAT_TT_QUERY;
tt_request->version = 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->ttl = TTL;
tt_request->ttvn = ttvn;
tt_request->tt_data = tt_crc;
tt_request->flags = TT_REQUEST;
if (full_table)
tt_request->flags |= TT_FULL_TABLE;
neigh_node = orig_node_get_router(dst_orig_node);
if (!neigh_node)
goto out;
bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
"[%c]\n", dst_orig_node->orig, neigh_node->addr,
(full_table ? 'F' : '.'));
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
ret = 0;
out:
if (neigh_node)
neigh_node_free_ref(neigh_node);
if (primary_if)
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 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;
bat_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 = get_orig_node(bat_priv, tt_request->dst);
if (!req_dst_orig_node)
goto out;
res_dst_orig_node = get_orig_node(bat_priv, tt_request->src);
if (!res_dst_orig_node)
goto out;
neigh_node = orig_node_get_router(res_dst_orig_node);
if (!neigh_node)
goto out;
primary_if = 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 have not the requested data */
if (orig_ttvn != req_ttvn ||
tt_request->tt_data != req_dst_orig_node->tt_crc)
goto out;
/* If it has explicitly been requested the full table */
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 = tt_response_fill_table(tt_len, ttvn,
bat_priv->tt_global_hash,
primary_if, tt_global_valid_entry,
req_dst_orig_node);
if (!skb)
goto out;
tt_response = (struct tt_query_packet *)skb->data;
}
tt_response->packet_type = BAT_TT_QUERY;
tt_response->version = COMPAT_VERSION;
tt_response->ttl = 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;
bat_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);
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)
orig_node_free_ref(res_dst_orig_node);
if (req_dst_orig_node)
orig_node_free_ref(req_dst_orig_node);
if (neigh_node)
neigh_node_free_ref(neigh_node);
if (primary_if)
hardif_free_ref(primary_if);
if (!ret)
kfree_skb(skb);
return ret;
}
static bool 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;
bat_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 = get_orig_node(bat_priv, tt_request->src);
if (!orig_node)
goto out;
neigh_node = orig_node_get_router(orig_node);
if (!neigh_node)
goto out;
primary_if = 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 = tt_response_fill_table(tt_len, ttvn,
bat_priv->tt_local_hash,
primary_if, NULL, NULL);
if (!skb)
goto out;
tt_response = (struct tt_query_packet *)skb->data;
}
tt_response->packet_type = BAT_TT_QUERY;
tt_response->version = COMPAT_VERSION;
tt_response->ttl = 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;
bat_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' : '.'));
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)
orig_node_free_ref(orig_node);
if (neigh_node)
neigh_node_free_ref(neigh_node);
if (primary_if)
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 send_tt_response(struct bat_priv *bat_priv,
struct tt_query_packet *tt_request)
{
if (is_my_mac(tt_request->dst))
return send_my_tt_response(bat_priv, tt_request);
else
return send_other_tt_response(bat_priv, tt_request);
}
static void _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;
for (i = 0; i < tt_num_changes; i++) {
if ((tt_change + i)->flags & TT_CHANGE_DEL)
tt_global_del(bat_priv, orig_node,
(tt_change + i)->addr,
"tt removed by changes",
(tt_change + i)->flags & TT_CLIENT_ROAM);
else
if (!tt_global_add(bat_priv, orig_node,
(tt_change + i)->addr, ttvn, false))
/* 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;
}
}
static void tt_fill_gtable(struct bat_priv *bat_priv,
struct tt_query_packet *tt_response)
{
struct orig_node *orig_node = NULL;
orig_node = orig_hash_find(bat_priv, tt_response->src);
if (!orig_node)
goto out;
/* Purge the old table first.. */
tt_global_del_orig(bat_priv, orig_node, "Received full table");
_tt_update_changes(bat_priv, orig_node,
(struct tt_change *)(tt_response + 1),
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)
orig_node_free_ref(orig_node);
}
void 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)
{
_tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
ttvn);
tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
tt_num_changes);
atomic_set(&orig_node->last_ttvn, ttvn);
}
bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
{
struct tt_local_entry *tt_local_entry;
spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);
spin_unlock_bh(&bat_priv->tt_lhash_lock);
if (tt_local_entry)
return true;
return false;
}
void 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;
bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
"ttvn %d t_size: %d [%c]\n",
tt_response->src, tt_response->ttvn,
tt_response->tt_data,
(tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
orig_node = orig_hash_find(bat_priv, tt_response->src);
if (!orig_node)
goto out;
if (tt_response->flags & TT_FULL_TABLE)
tt_fill_gtable(bat_priv, tt_response);
else
tt_update_changes(bat_priv, orig_node, 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 (!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 */
spin_lock_bh(&bat_priv->tt_ghash_lock);
orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
spin_unlock_bh(&bat_priv->tt_ghash_lock);
/* Roaming phase is over: tables are in sync again. I can
* unset the flag */
orig_node->tt_poss_change = false;
out:
if (orig_node)
orig_node_free_ref(orig_node);
}
int tt_init(struct bat_priv *bat_priv)
{
if (!tt_local_init(bat_priv))
return 0;
if (!tt_global_init(bat_priv))
return 0;
tt_start_timer(bat_priv);
return 1;
}
static void 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 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 (!is_out_of_time(node->first_time,
ROAMING_MAX_TIME * 1000))
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 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 (!compare_eth(tt_roam_node->addr, client))
continue;
if (is_out_of_time(tt_roam_node->first_time,
ROAMING_MAX_TIME * 1000))
continue;
if (!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, 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;
}
void 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 (!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->packet_type = BAT_ROAM_ADV;
roam_adv_packet->version = COMPAT_VERSION;
roam_adv_packet->ttl = TTL;
primary_if = primary_if_get_selected(bat_priv);
if (!primary_if)
goto out;
memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
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 = orig_node_get_router(orig_node);
if (!neigh_node)
goto out;
bat_dbg(DBG_TT, bat_priv,
"Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
orig_node->orig, client, neigh_node->addr);
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
ret = 0;
out:
if (neigh_node)
neigh_node_free_ref(neigh_node);
if (ret)
kfree_skb(skb);
return;
}
static void 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);
tt_local_purge(bat_priv);
tt_global_roam_purge(bat_priv);
tt_req_purge(bat_priv);
tt_roam_purge(bat_priv);
tt_start_timer(bat_priv);
}
void tt_free(struct bat_priv *bat_priv)
{
cancel_delayed_work_sync(&bat_priv->tt_work);
tt_local_table_free(bat_priv);
tt_global_table_free(bat_priv);
tt_req_list_free(bat_priv);
tt_changes_list_free(bat_priv);
tt_roam_list_free(bat_priv);
kfree(bat_priv->tt_buff);
}