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 /**
  33  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
  34  * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
  35  * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
  36  */
  37 enum batadv_hard_if_cleanup {
  38         BATADV_IF_CLEANUP_KEEP,
  39         BATADV_IF_CLEANUP_AUTO,
  40 };
  41
  42 extern struct notifier_block batadv_hard_if_notifier;
  43
  44 struct batadv_hard_iface*
  45 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
  46 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
  47                                    const char *iface_name);
  48 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
  49                                      enum batadv_hard_if_cleanup autodel);
  50 void batadv_hardif_remove_interfaces(void);
  51 int batadv_hardif_min_mtu(struct net_device *soft_iface);
  52 void batadv_update_min_mtu(struct net_device *soft_iface);
  53 void batadv_hardif_free_rcu(struct rcu_head *rcu);
  54 bool batadv_is_wifi_iface(int ifindex);
  55
  56 static inline void
  57 batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
  58 {
  59         if (atomic_dec_and_test(&hard_iface->refcount))
  60                 call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
  61 }
  62
  63 static inline struct batadv_hard_iface *
  64 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
  65 {
  66         struct batadv_hard_iface *hard_iface;
  67
  68         rcu_read_lock();
  69         hard_iface = rcu_dereference(bat_priv->primary_if);
  70         if (!hard_iface)
  71                 goto out;
  72
  73         if (!atomic_inc_not_zero(&hard_iface->refcount))
  74                 hard_iface = NULL;
  75
  76 out:
  77         rcu_read_unlock();
  78         return hard_iface;
  79 }
  80
  81 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */