linux-imx

// SPDX-License-Identifier: GPL-2.0

/* Copyright (C) 2007-2019  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 <linux/byteorder/generic.h>

#include <linux/etherdevice.h>

#include <linux/gfp.h>

#include <linux/if_ether.h>

#include <linux/kernel.h>

#include <linux/kref.h>

#include <linux/list.h>

#include <linux/lockdep.h>

#include <linux/netdevice.h>

#include <linux/pkt_sched.h>

#include <linux/rculist.h>

#include <linux/rcupdate.h>

#include <linux/skbuff.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/stddef.h>

#include <linux/string.h>

#include <linux/types.h>

#include <uapi/linux/batadv_packet.h>

​

#include "originator.h"

#include "send.h"

#include "tvlv.h"

​

/**

 * batadv_tvlv_handler_release() - release tvlv handler from lists and queue for

 *  free after rcu grace period

 * @ref: kref pointer of the tvlv

 */

static void batadv_tvlv_handler_release(struct kref *ref)

{

    struct batadv_tvlv_handler *tvlv_handler;

​

    tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount);

    kfree_rcu(tvlv_handler, rcu);

}

​

/**

 * batadv_tvlv_handler_put() - decrement the tvlv container refcounter and

 *  possibly release it

 * @tvlv_handler: the tvlv handler to free

 */

static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler)

{

    kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release);

}

​

/**

 * batadv_tvlv_handler_get() - retrieve tvlv handler from the tvlv handler list

 *  based on the provided type and version (both need to match)

 * @bat_priv: the bat priv with all the soft interface information

 * @type: tvlv handler type to look for

 * @version: tvlv handler version to look for

 *

 * Return: tvlv handler if found or NULL otherwise.

 */

static struct batadv_tvlv_handler *

batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version)

{

    struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;

​

    rcu_read_lock();

    hlist_for_each_entry_rcu(tvlv_handler_tmp,

                 &bat_priv->tvlv.handler_list, list) {

        if (tvlv_handler_tmp->type != type)

            continue;

​

        if (tvlv_handler_tmp->version != version)

            continue;

​

        if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount))

            continue;