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 bool is_wifi_iface(int ifindex);
  46
  47 static inline void hardif_free_ref(struct hard_iface *hard_iface)
  48 {
  49         if (atomic_dec_and_test(&hard_iface->refcount))
  50                 call_rcu(&hard_iface->rcu, hardif_free_rcu);
  51 }
  52
  53 static inline struct hard_iface *primary_if_get_selected(
  54                                                 struct bat_priv *bat_priv)
  55 {
  56         struct hard_iface *hard_iface;
  57
  58         rcu_read_lock();
  59         hard_iface = rcu_dereference(bat_priv->primary_if);
  60         if (!hard_iface)
  61                 goto out;
  62
  63         if (!atomic_inc_not_zero(&hard_iface->refcount))
  64                 hard_iface = NULL;
  65
  66 out:
  67         rcu_read_unlock();
  68         return hard_iface;
  69 }
  70
  71 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */