net/batman-adv/hard-interface.h

   1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
  21 #define _NET_BATMAN_ADV_HARD_INTERFACE_H_
  22
  23 enum batadv_hard_if_state {
  24         BATADV_IF_NOT_IN_USE,
  25         BATADV_IF_TO_BE_REMOVED,
  26         BATADV_IF_INACTIVE,
  27         BATADV_IF_ACTIVE,
  28         BATADV_IF_TO_BE_ACTIVATED,
  29         BATADV_IF_I_WANT_YOU,
  30 };
  31
  32 extern struct notifier_block batadv_hard_if_notifier;
  33
  34 struct batadv_hard_iface*
  35 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
  36 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
  37                                    const char *iface_name);
  38 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface);
  39 void batadv_hardif_remove_interfaces(void);
  40 int batadv_hardif_min_mtu(struct net_device *soft_iface);
  41 void batadv_update_min_mtu(struct net_device *soft_iface);
  42 void batadv_hardif_free_rcu(struct rcu_head *rcu);
  43 bool batadv_is_wifi_iface(int ifindex);
  44
  45 static inline void
  46 batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
  47 {
  48         if (atomic_dec_and_test(&hard_iface->refcount))
  49                 call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
  50 }
  51
  52 static inline struct batadv_hard_iface *
  53 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
  54 {
  55         struct batadv_hard_iface *hard_iface;
  56
  57         rcu_read_lock();
  58         hard_iface = rcu_dereference(bat_priv->primary_if);
  59         if (!hard_iface)
  60                 goto out;
  61
  62         if (!atomic_inc_not_zero(&hard_iface->refcount))
  63                 hard_iface = NULL;
  64
  65 out:
  66         rcu_read_unlock();
  67         return hard_iface;
  68 }
  69
  70 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */