net/batman-adv/hard-interface.h

   1 /* Copyright (C) 2007-2014 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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
  19 #define _NET_BATMAN_ADV_HARD_INTERFACE_H_
  20
  21 enum batadv_hard_if_state {
  22         BATADV_IF_NOT_IN_USE,
  23         BATADV_IF_TO_BE_REMOVED,
  24         BATADV_IF_INACTIVE,
  25         BATADV_IF_ACTIVE,
  26         BATADV_IF_TO_BE_ACTIVATED,
  27         BATADV_IF_I_WANT_YOU,
  28 };
  29
  30 /**
  31  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
  32  * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
  33  * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
  34  */
  35 enum batadv_hard_if_cleanup {
  36         BATADV_IF_CLEANUP_KEEP,
  37         BATADV_IF_CLEANUP_AUTO,
  38 };
  39
  40 extern struct notifier_block batadv_hard_if_notifier;
  41
  42 bool batadv_is_wifi_netdev(struct net_device *net_device);
  43 bool batadv_is_wifi_iface(int ifindex);
  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
  55 /**
  56  * batadv_hardif_free_ref - decrement the hard interface refcounter and
  57  *  possibly free it
  58  * @hard_iface: the hard interface to free
  59  */
  60 static inline void
  61 batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
  62 {
  63         if (atomic_dec_and_test(&hard_iface->refcount))
  64                 call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
  65 }
  66
  67 /**
  68  * batadv_hardif_free_ref_now - decrement the hard interface refcounter and
  69  *  possibly free it (without rcu callback)
  70  * @hard_iface: the hard interface to free
  71  */
  72 static inline void
  73 batadv_hardif_free_ref_now(struct batadv_hard_iface *hard_iface)
  74 {
  75         if (atomic_dec_and_test(&hard_iface->refcount))
  76                 batadv_hardif_free_rcu(&hard_iface->rcu);
  77 }
  78
  79 static inline struct batadv_hard_iface *
  80 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
  81 {
  82         struct batadv_hard_iface *hard_iface;
  83
  84         rcu_read_lock();
  85         hard_iface = rcu_dereference(bat_priv->primary_if);
  86         if (!hard_iface)
  87                 goto out;
  88
  89         if (!atomic_inc_not_zero(&hard_iface->refcount))
  90                 hard_iface = NULL;
  91
  92 out:
  93         rcu_read_unlock();
  94         return hard_iface;
  95 }
  96
  97 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */