net/batman-adv/hard-interface.h

   1 /*
   2  * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
  23 #define _NET_BATMAN_ADV_HARD_INTERFACE_H_
  24
  25 enum hard_if_state {
  26         IF_NOT_IN_USE,
  27         IF_TO_BE_REMOVED,
  28         IF_INACTIVE,
  29         IF_ACTIVE,
  30         IF_TO_BE_ACTIVATED,
  31         IF_I_WANT_YOU
  32 };
  33
  34 extern struct notifier_block hard_if_notifier;
  35
  36 struct hard_iface*
  37 hardif_get_by_netdev(const struct net_device *net_dev);
  38 int hardif_enable_interface(struct hard_iface *hard_iface,
  39                             const char *iface_name);
  40 void hardif_disable_interface(struct hard_iface *hard_iface);
  41 void hardif_remove_interfaces(void);
  42 int hardif_min_mtu(struct net_device *soft_iface);
  43 void update_min_mtu(struct net_device *soft_iface);
  44 void hardif_free_rcu(struct rcu_head *rcu);
  45
  46 static inline void hardif_free_ref(struct hard_iface *hard_iface)
  47 {
  48         if (atomic_dec_and_test(&hard_iface->refcount))
  49                 call_rcu(&hard_iface->rcu, hardif_free_rcu);
  50 }
  51
  52 static inline struct hard_iface *primary_if_get_selected(
  53                                                 struct bat_priv *bat_priv)
  54 {
  55         struct 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_ */