/* Copyright (C) 2007-2014 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/>.
   */
  
  #ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
  #define _NET_BATMAN_ADV_HARD_INTERFACE_H_
  
  enum batadv_hard_if_state {
  	BATADV_IF_NOT_IN_USE,
  	BATADV_IF_TO_BE_REMOVED,
  	BATADV_IF_INACTIVE,
  	BATADV_IF_ACTIVE,
  	BATADV_IF_TO_BE_ACTIVATED,
  	BATADV_IF_I_WANT_YOU,
  };
  
  /**
   * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
   * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
   * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
   */
  enum batadv_hard_if_cleanup {
  	BATADV_IF_CLEANUP_KEEP,
  	BATADV_IF_CLEANUP_AUTO,
  };
  
  extern struct notifier_block batadv_hard_if_notifier;
  
  bool batadv_is_wifi_netdev(struct net_device *net_device);
  bool batadv_is_wifi_iface(int ifindex);
  struct batadv_hard_iface*
  batadv_hardif_get_by_netdev(const struct net_device *net_dev);
  int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
  				   const char *iface_name);
  void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
  				     enum batadv_hard_if_cleanup autodel);
  void batadv_hardif_remove_interfaces(void);
  int batadv_hardif_min_mtu(struct net_device *soft_iface);
  void batadv_update_min_mtu(struct net_device *soft_iface);
  void batadv_hardif_free_rcu(struct rcu_head *rcu);
  
  /**
   * batadv_hardif_free_ref - decrement the hard interface refcounter and
   *  possibly free it
   * @hard_iface: the hard interface to free
   */
  static inline void
  batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
  {
  	if (atomic_dec_and_test(&hard_iface->refcount))
  		call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
  }
  
  /**
   * batadv_hardif_free_ref_now - decrement the hard interface refcounter and
   *  possibly free it (without rcu callback)
   * @hard_iface: the hard interface to free
   */
  static inline void
  batadv_hardif_free_ref_now(struct batadv_hard_iface *hard_iface)
  {
  	if (atomic_dec_and_test(&hard_iface->refcount))
  		batadv_hardif_free_rcu(&hard_iface->rcu);
  }
  
  static inline struct batadv_hard_iface *
  batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
  {
  	struct batadv_hard_iface *hard_iface;
  
  	rcu_read_lock();
  	hard_iface = rcu_dereference(bat_priv->primary_if);
  	if (!hard_iface)
  		goto out;
  
  	if (!atomic_inc_not_zero(&hard_iface->refcount))
  		hard_iface = NULL;
  
  out:
  	rcu_read_unlock();
  	return hard_iface;
  }
  
  #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */