net/batman-adv/send.c - maze/linux - Git at Google

 /* Copyright (C) 2007-2012 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 "distributed-arp-table.h"
 #include "send.h"
 #include "routing.h"
 #include "translation-table.h"
 #include "soft-interface.h"
 #include "hard-interface.h"
 #include "vis.h"
 #include "gateway_common.h"
 #include "originator.h"

 #include <linux/if_ether.h>

 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);

 /* send out an already prepared packet to the given address via the
  * specified batman interface
  */
 int batadv_send_skb_packet(struct sk_buff *skb,
 			   struct batadv_hard_iface *hard_iface,
 			   const uint8_t *dst_addr)
 {
 	struct ethhdr *ethhdr;

 	if (hard_iface->if_status != BATADV_IF_ACTIVE)
 		goto send_skb_err;

 	if (unlikely(!hard_iface->net_dev))
 		goto send_skb_err;

 	if (!(hard_iface->net_dev->flags & IFF_UP)) {
 		pr_warn("Interface %s is not up - can't send packet via that interface!\n",
 			hard_iface->net_dev->name);
 		goto send_skb_err;
 	}

 	/* push to the ethernet header. */
 	if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
 		goto send_skb_err;

 	skb_reset_mac_header(skb);

 	ethhdr = (struct ethhdr *)skb_mac_header(skb);
 	memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
 	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
 	ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);

 	skb_set_network_header(skb, ETH_HLEN);
 	skb->priority = TC_PRIO_CONTROL;
 	skb->protocol = __constant_htons(ETH_P_BATMAN);

 	skb->dev = hard_iface->net_dev;

 	/* dev_queue_xmit() returns a negative result on error.	 However on
 	 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
 	 * (which is > 0). This will not be treated as an error.
 	 */
 	return dev_queue_xmit(skb);
 send_skb_err:
 	kfree_skb(skb);
 	return NET_XMIT_DROP;
 }

 /**
  * batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
  * @skb: Packet to be transmitted.
  * @orig_node: Final destination of the packet.
  * @recv_if: Interface used when receiving the packet (can be NULL).
  *
  * Looks up the best next-hop towards the passed originator and passes the
  * skb on for preparation of MAC header. If the packet originated from this
  * host, NULL can be passed as recv_if and no interface alternating is
  * attempted.
  *
  * Returns TRUE on success; FALSE otherwise.
  */
 bool batadv_send_skb_to_orig(struct sk_buff *skb,
 			     struct batadv_orig_node *orig_node,
 			     struct batadv_hard_iface *recv_if)
 {
 	struct batadv_priv *bat_priv = orig_node->bat_priv;
 	struct batadv_neigh_node *neigh_node;

 	/* batadv_find_router() increases neigh_nodes refcount if found. */
 	neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
 	if (!neigh_node)
 		return false;

 	/* route it */
 	batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);

 	batadv_neigh_node_free_ref(neigh_node);

 	return true;
 }

 void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
 {
 	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);

 	if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
 	    (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
 		return;

 	/* the interface gets activated here to avoid race conditions between
 	 * the moment of activating the interface in
 	 * hardif_activate_interface() where the originator mac is set and
 	 * outdated packets (especially uninitialized mac addresses) in the
 	 * packet queue
 	 */
 	if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
 		hard_iface->if_status = BATADV_IF_ACTIVE;

 	bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
 }

 static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
 {
 	if (forw_packet->skb)
 		kfree_skb(forw_packet->skb);
 	if (forw_packet->if_incoming)
 		batadv_hardif_free_ref(forw_packet->if_incoming);
 	kfree(forw_packet);
 }

 static void
 _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
 				 struct batadv_forw_packet *forw_packet,
 				 unsigned long send_time)
 {
 	INIT_HLIST_NODE(&forw_packet->list);

 	/* add new packet to packet list */
 	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 	hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
 	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

 	/* start timer for this packet */
 	INIT_DELAYED_WORK(&forw_packet->delayed_work,
 			  batadv_send_outstanding_bcast_packet);
 	queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
 			   send_time);
 }

 /* add a broadcast packet to the queue and setup timers. broadcast packets
  * are sent multiple times to increase probability for being received.
  *
  * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
  * errors.
  *
  * The skb is not consumed, so the caller should make sure that the
  * skb is freed.
  */
 int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
 				    const struct sk_buff *skb,
 				    unsigned long delay)
 {
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_forw_packet *forw_packet;
 	struct batadv_bcast_packet *bcast_packet;
 	struct sk_buff *newskb;

 	if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "bcast packet queue full\n");
 		goto out;
 	}

 	primary_if = batadv_primary_if_get_selected(bat_priv);
 	if (!primary_if)
 		goto out_and_inc;

 	forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);

 	if (!forw_packet)
 		goto out_and_inc;

 	newskb = skb_copy(skb, GFP_ATOMIC);
 	if (!newskb)
 		goto packet_free;

 	/* as we have a copy now, it is safe to decrease the TTL */
 	bcast_packet = (struct batadv_bcast_packet *)newskb->data;
 	bcast_packet->header.ttl--;

 	skb_reset_mac_header(newskb);

 	forw_packet->skb = newskb;
 	forw_packet->if_incoming = primary_if;

 	/* how often did we send the bcast packet ? */
 	forw_packet->num_packets = 0;

 	_batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
 	return NETDEV_TX_OK;

 packet_free:
 	kfree(forw_packet);
 out_and_inc:
 	atomic_inc(&bat_priv->bcast_queue_left);
 out:
 	if (primary_if)
 		batadv_hardif_free_ref(primary_if);
 	return NETDEV_TX_BUSY;
 }

 static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
 {
 	struct batadv_hard_iface *hard_iface;
 	struct delayed_work *delayed_work;
 	struct batadv_forw_packet *forw_packet;
 	struct sk_buff *skb1;
 	struct net_device *soft_iface;
 	struct batadv_priv *bat_priv;

 	delayed_work = container_of(work, struct delayed_work, work);
 	forw_packet = container_of(delayed_work, struct batadv_forw_packet,
 				   delayed_work);
 	soft_iface = forw_packet->if_incoming->soft_iface;
 	bat_priv = netdev_priv(soft_iface);

 	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 	hlist_del(&forw_packet->list);
 	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

 	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
 		goto out;

 	if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
 		goto out;

 	/* rebroadcast packet */
 	rcu_read_lock();
 	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 		if (hard_iface->soft_iface != soft_iface)
 			continue;

 		/* send a copy of the saved skb */
 		skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
 		if (skb1)
 			batadv_send_skb_packet(skb1, hard_iface,
 					       batadv_broadcast_addr);
 	}
 	rcu_read_unlock();

 	forw_packet->num_packets++;

 	/* if we still have some more bcasts to send */
 	if (forw_packet->num_packets < 3) {
 		_batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
 						 msecs_to_jiffies(5));
 		return;
 	}

 out:
 	batadv_forw_packet_free(forw_packet);
 	atomic_inc(&bat_priv->bcast_queue_left);
 }

 void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
 {
 	struct delayed_work *delayed_work;
 	struct batadv_forw_packet *forw_packet;
 	struct batadv_priv *bat_priv;

 	delayed_work = container_of(work, struct delayed_work, work);
 	forw_packet = container_of(delayed_work, struct batadv_forw_packet,
 				   delayed_work);
 	bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
 	spin_lock_bh(&bat_priv->forw_bat_list_lock);
 	hlist_del(&forw_packet->list);
 	spin_unlock_bh(&bat_priv->forw_bat_list_lock);

 	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
 		goto out;

 	bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);

 	/* we have to have at least one packet in the queue
 	 * to determine the queues wake up time unless we are
 	 * shutting down
 	 */
 	if (forw_packet->own)
 		batadv_schedule_bat_ogm(forw_packet->if_incoming);

 out:
 	/* don't count own packet */
 	if (!forw_packet->own)
 		atomic_inc(&bat_priv->batman_queue_left);

 	batadv_forw_packet_free(forw_packet);
 }

 void
 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
 				 const struct batadv_hard_iface *hard_iface)
 {
 	struct batadv_forw_packet *forw_packet;
 	struct hlist_node *tmp_node, *safe_tmp_node;
 	bool pending;

 	if (hard_iface)
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "purge_outstanding_packets(): %s\n",
 			   hard_iface->net_dev->name);
 	else
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "purge_outstanding_packets()\n");

 	/* free bcast list */
 	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
 				  &bat_priv->forw_bcast_list, list) {
 		/* if purge_outstanding_packets() was called with an argument
 		 * we delete only packets belonging to the given interface
 		 */
 		if ((hard_iface) &&
 		    (forw_packet->if_incoming != hard_iface))
 			continue;

 		spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

 		/* batadv_send_outstanding_bcast_packet() will lock the list to
 		 * delete the item from the list
 		 */
 		pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 		spin_lock_bh(&bat_priv->forw_bcast_list_lock);

 		if (pending) {
 			hlist_del(&forw_packet->list);
 			batadv_forw_packet_free(forw_packet);
 		}
 	}
 	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

 	/* free batman packet list */
 	spin_lock_bh(&bat_priv->forw_bat_list_lock);
 	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
 				  &bat_priv->forw_bat_list, list) {
 		/* if purge_outstanding_packets() was called with an argument
 		 * we delete only packets belonging to the given interface
 		 */
 		if ((hard_iface) &&
 		    (forw_packet->if_incoming != hard_iface))
 			continue;

 		spin_unlock_bh(&bat_priv->forw_bat_list_lock);

 		/* send_outstanding_bat_packet() will lock the list to
 		 * delete the item from the list
 		 */
 		pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 		spin_lock_bh(&bat_priv->forw_bat_list_lock);

 		if (pending) {
 			hlist_del(&forw_packet->list);
 			batadv_forw_packet_free(forw_packet);
 		}
 	}
 	spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 }
	/* Copyright (C) 2007-2012 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 "distributed-arp-table.h"
	#include "send.h"
	#include "routing.h"
	#include "translation-table.h"
	#include "soft-interface.h"
	#include "hard-interface.h"
	#include "vis.h"
	#include "gateway_common.h"
	#include "originator.h"

	#include <linux/if_ether.h>

	static void batadv_send_outstanding_bcast_packet(struct work_struct *work);

	/* send out an already prepared packet to the given address via the
	* specified batman interface
	*/
	int batadv_send_skb_packet(struct sk_buff *skb,
	struct batadv_hard_iface *hard_iface,
	const uint8_t *dst_addr)
	{
	struct ethhdr *ethhdr;

	if (hard_iface->if_status != BATADV_IF_ACTIVE)
	goto send_skb_err;

	if (unlikely(!hard_iface->net_dev))
	goto send_skb_err;

	if (!(hard_iface->net_dev->flags & IFF_UP)) {
	pr_warn("Interface %s is not up - can't send packet via that interface!\n",
	hard_iface->net_dev->name);
	goto send_skb_err;
	}

	/* push to the ethernet header. */
	if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
	goto send_skb_err;

	skb_reset_mac_header(skb);

	ethhdr = (struct ethhdr *)skb_mac_header(skb);
	memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
	ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);

	skb_set_network_header(skb, ETH_HLEN);
	skb->priority = TC_PRIO_CONTROL;
	skb->protocol = __constant_htons(ETH_P_BATMAN);

	skb->dev = hard_iface->net_dev;

	/* dev_queue_xmit() returns a negative result on error. However on
	* congestion and traffic shaping, it drops and returns NET_XMIT_DROP
	* (which is > 0). This will not be treated as an error.
	*/
	return dev_queue_xmit(skb);
	send_skb_err:
	kfree_skb(skb);
	return NET_XMIT_DROP;
	}

	/**
	* batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
	* @skb: Packet to be transmitted.
	* @orig_node: Final destination of the packet.
	* @recv_if: Interface used when receiving the packet (can be NULL).
	*
	* Looks up the best next-hop towards the passed originator and passes the
	* skb on for preparation of MAC header. If the packet originated from this
	* host, NULL can be passed as recv_if and no interface alternating is
	* attempted.
	*
	* Returns TRUE on success; FALSE otherwise.
	*/
	bool batadv_send_skb_to_orig(struct sk_buff *skb,
	struct batadv_orig_node *orig_node,
	struct batadv_hard_iface *recv_if)
	{
	struct batadv_priv *bat_priv = orig_node->bat_priv;
	struct batadv_neigh_node *neigh_node;

	/* batadv_find_router() increases neigh_nodes refcount if found. */
	neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
	if (!neigh_node)
	return false;

	/* route it */
	batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);

	batadv_neigh_node_free_ref(neigh_node);

	return true;
	}

	void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
	{
	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);

	if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) \|\|
	(hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
	return;

	/* the interface gets activated here to avoid race conditions between
	* the moment of activating the interface in
	* hardif_activate_interface() where the originator mac is set and
	* outdated packets (especially uninitialized mac addresses) in the
	* packet queue
	*/
	if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
	hard_iface->if_status = BATADV_IF_ACTIVE;

	bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
	}

	static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
	{
	if (forw_packet->skb)
	kfree_skb(forw_packet->skb);
	if (forw_packet->if_incoming)
	batadv_hardif_free_ref(forw_packet->if_incoming);
	kfree(forw_packet);
	}

	static void
	_batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
	struct batadv_forw_packet *forw_packet,
	unsigned long send_time)
	{
	INIT_HLIST_NODE(&forw_packet->list);

	/* add new packet to packet list */
	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
	hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

	/* start timer for this packet */
	INIT_DELAYED_WORK(&forw_packet->delayed_work,
	batadv_send_outstanding_bcast_packet);
	queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
	send_time);
	}

	/* add a broadcast packet to the queue and setup timers. broadcast packets
	* are sent multiple times to increase probability for being received.
	*
	* This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
	* errors.
	*
	* The skb is not consumed, so the caller should make sure that the
	* skb is freed.
	*/
	int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
	const struct sk_buff *skb,
	unsigned long delay)
	{
	struct batadv_hard_iface *primary_if = NULL;
	struct batadv_forw_packet *forw_packet;
	struct batadv_bcast_packet *bcast_packet;
	struct sk_buff *newskb;

	if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
	"bcast packet queue full\n");
	goto out;
	}

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (!primary_if)
	goto out_and_inc;

	forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);

	if (!forw_packet)
	goto out_and_inc;

	newskb = skb_copy(skb, GFP_ATOMIC);
	if (!newskb)
	goto packet_free;

	/* as we have a copy now, it is safe to decrease the TTL */
	bcast_packet = (struct batadv_bcast_packet *)newskb->data;
	bcast_packet->header.ttl--;

	skb_reset_mac_header(newskb);

	forw_packet->skb = newskb;
	forw_packet->if_incoming = primary_if;

	/* how often did we send the bcast packet ? */
	forw_packet->num_packets = 0;

	_batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
	return NETDEV_TX_OK;

	packet_free:
	kfree(forw_packet);
	out_and_inc:
	atomic_inc(&bat_priv->bcast_queue_left);
	out:
	if (primary_if)
	batadv_hardif_free_ref(primary_if);
	return NETDEV_TX_BUSY;
	}

	static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
	{
	struct batadv_hard_iface *hard_iface;
	struct delayed_work *delayed_work;
	struct batadv_forw_packet *forw_packet;
	struct sk_buff *skb1;
	struct net_device *soft_iface;
	struct batadv_priv *bat_priv;

	delayed_work = container_of(work, struct delayed_work, work);
	forw_packet = container_of(delayed_work, struct batadv_forw_packet,
	delayed_work);
	soft_iface = forw_packet->if_incoming->soft_iface;
	bat_priv = netdev_priv(soft_iface);

	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
	hlist_del(&forw_packet->list);
	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
	goto out;

	if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
	goto out;

	/* rebroadcast packet */
	rcu_read_lock();
	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
	if (hard_iface->soft_iface != soft_iface)
	continue;

	/* send a copy of the saved skb */
	skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
	if (skb1)
	batadv_send_skb_packet(skb1, hard_iface,
	batadv_broadcast_addr);
	}
	rcu_read_unlock();

	forw_packet->num_packets++;

	/* if we still have some more bcasts to send */
	if (forw_packet->num_packets < 3) {
	_batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
	msecs_to_jiffies(5));
	return;
	}

	out:
	batadv_forw_packet_free(forw_packet);
	atomic_inc(&bat_priv->bcast_queue_left);
	}

	void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
	{
	struct delayed_work *delayed_work;
	struct batadv_forw_packet *forw_packet;
	struct batadv_priv *bat_priv;

	delayed_work = container_of(work, struct delayed_work, work);
	forw_packet = container_of(delayed_work, struct batadv_forw_packet,
	delayed_work);
	bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
	spin_lock_bh(&bat_priv->forw_bat_list_lock);
	hlist_del(&forw_packet->list);
	spin_unlock_bh(&bat_priv->forw_bat_list_lock);

	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
	goto out;

	bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);

	/* we have to have at least one packet in the queue
	* to determine the queues wake up time unless we are
	* shutting down
	*/
	if (forw_packet->own)
	batadv_schedule_bat_ogm(forw_packet->if_incoming);

	out:
	/* don't count own packet */
	if (!forw_packet->own)
	atomic_inc(&bat_priv->batman_queue_left);

	batadv_forw_packet_free(forw_packet);
	}

	void
	batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
	const struct batadv_hard_iface *hard_iface)
	{
	struct batadv_forw_packet *forw_packet;
	struct hlist_node tmp_node, safe_tmp_node;
	bool pending;

	if (hard_iface)
	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
	"purge_outstanding_packets(): %s\n",
	hard_iface->net_dev->name);
	else
	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
	"purge_outstanding_packets()\n");

	/* free bcast list */
	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
	&bat_priv->forw_bcast_list, list) {
	/* if purge_outstanding_packets() was called with an argument
	* we delete only packets belonging to the given interface
	*/
	if ((hard_iface) &&
	(forw_packet->if_incoming != hard_iface))
	continue;

	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

	/* batadv_send_outstanding_bcast_packet() will lock the list to
	* delete the item from the list
	*/
	pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
	spin_lock_bh(&bat_priv->forw_bcast_list_lock);

	if (pending) {
	hlist_del(&forw_packet->list);
	batadv_forw_packet_free(forw_packet);
	}
	}
	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

	/* free batman packet list */
	spin_lock_bh(&bat_priv->forw_bat_list_lock);
	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
	&bat_priv->forw_bat_list, list) {
	/* if purge_outstanding_packets() was called with an argument
	* we delete only packets belonging to the given interface
	*/
	if ((hard_iface) &&
	(forw_packet->if_incoming != hard_iface))
	continue;

	spin_unlock_bh(&bat_priv->forw_bat_list_lock);

	/* send_outstanding_bat_packet() will lock the list to
	* delete the item from the list
	*/
	pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
	spin_lock_bh(&bat_priv->forw_bat_list_lock);

	if (pending) {
	hlist_del(&forw_packet->list);
	batadv_forw_packet_free(forw_packet);
	}
	}
	spin_unlock_bh(&bat_priv->forw_bat_list_lock);
	}