/* Copyright (C) 2009-2014 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, see <http://www.gnu.org/licenses/>.
*/
#include "main.h"
#include "distributed-arp-table.h"
#include "originator.h"
#include "hash.h"
#include "translation-table.h"
#include "routing.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "soft-interface.h"
#include "bridge_loop_avoidance.h"
#include "network-coding.h"
#include "fragmentation.h"
#include "multicast.h"
/* hash class keys */
static struct lock_class_key batadv_orig_hash_lock_class_key;
static void batadv_purge_orig(struct work_struct *work);
/* returns 1 if they are the same originator */
int batadv_compare_orig(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct batadv_orig_node,
hash_entry);
return batadv_compare_eth(data1, data2);
}
/**
* batadv_orig_node_vlan_get - get an orig_node_vlan object
* @orig_node: the originator serving the VLAN
* @vid: the VLAN identifier
*
* Returns the vlan object identified by vid and belonging to orig_node or NULL
* if it does not exist.
*/
struct batadv_orig_node_vlan *
batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
unsigned short vid)
{
struct batadv_orig_node_vlan *vlan = NULL, *tmp;
rcu_read_lock();
list_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
if (tmp->vid != vid)
continue;
if (!atomic_inc_not_zero(&tmp->refcount))
continue;
vlan = tmp;
break;
}
rcu_read_unlock();
return vlan;
}
/**
* batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
* object
* @orig_node: the originator serving the VLAN
* @vid: the VLAN identifier
*
* Returns NULL in case of failure or the vlan object identified by vid and
* belonging to orig_node otherwise. The object is created and added to the list
* if it does not exist.
*
* The object is returned with refcounter increased by 1.
*/
struct batadv_orig_node_vlan *
batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
unsigned short vid)
{
struct batadv_orig_node_vlan *vlan;
spin_lock_bh(&orig_node->vlan_list_lock);
/* first look if an object for this vid already exists */
vlan = batadv_orig_node_vlan_get(orig_node, vid);
if (vlan)
goto out;
vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
if (!vlan)
goto out;
atomic_set(&vlan->refcount, 2);
vlan->vid = vid;
list_add_rcu(&vlan->list, &orig_node->vlan_list);
out:
spin_unlock_bh(&orig_node->vlan_list_lock);
return vlan;
}
/**
* batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
* the originator-vlan object
* @orig_vlan: the originator-vlan object to release
*/
void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
{
if (atomic_dec_and_test(&orig_vlan->refcount))
kfree_rcu(orig_vlan, rcu);
}
int batadv_originator_init(struct batadv_priv *bat_priv)
{
if (bat_priv->orig_hash)
return 0;
bat_priv->orig_hash = batadv_hash_new(1024);
if (!bat_priv->orig_hash)
goto err;
batadv_hash_set_lock_class(bat_priv->orig_hash,
&batadv_orig_hash_lock_class_key);
INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
queue_delayed_work(batadv_event_workqueue,
&bat_priv->orig_work,
msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
return 0;
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