net/batman-adv/hard-interface.h

   1 /* Copyright (C) 2007-2016  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 #include "main.h"
  22
  23 #include <linux/compiler.h>
  24 #include <linux/kref.h>
  25 #include <linux/notifier.h>
  26 #include <linux/rcupdate.h>
  27 #include <linux/stddef.h>
  28 #include <linux/types.h>
  29
  30 struct net_device;
  31 struct net;
  32
  33 enum batadv_hard_if_state {
  34         BATADV_IF_NOT_IN_USE,
  35         BATADV_IF_TO_BE_REMOVED,
  36         BATADV_IF_INACTIVE,
  37         BATADV_IF_ACTIVE,
  38         BATADV_IF_TO_BE_ACTIVATED,
  39         BATADV_IF_I_WANT_YOU,
  40 };
  41
  42 /**
  43  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
  44  * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
  45  * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
  46  */
  47 enum batadv_hard_if_cleanup {
  48         BATADV_IF_CLEANUP_KEEP,
  49         BATADV_IF_CLEANUP_AUTO,
  50 };
  51
  52 extern struct notifier_block batadv_hard_if_notifier;
  53
  54 bool batadv_is_wifi_netdev(struct net_device *net_device);
  55 bool batadv_is_wifi_iface(int ifindex);
  56 struct batadv_hard_iface*
  57 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
  58 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
  59                                    struct net *net, const char *iface_name);
  60 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
  61                                      enum batadv_hard_if_cleanup autodel);
  62 void batadv_hardif_remove_interfaces(void);
  63 int batadv_hardif_min_mtu(struct net_device *soft_iface);
  64 void batadv_update_min_mtu(struct net_device *soft_iface);
  65 void batadv_hardif_release(struct kref *ref);
  66
  67 /**
  68  * batadv_hardif_put - decrement the hard interface refcounter and possibly
  69  *  release it
  70  * @hard_iface: the hard interface to free
  71  */
  72 static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
  73 {
  74         kref_put(&hard_iface->refcount, batadv_hardif_release);
  75 }
  76
  77 static inline struct batadv_hard_iface *
  78 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
  79 {
  80         struct batadv_hard_iface *hard_iface;
  81
  82         rcu_read_lock();
  83         hard_iface = rcu_dereference(bat_priv->primary_if);
  84         if (!hard_iface)
  85                 goto out;
  86
  87         if (!kref_get_unless_zero(&hard_iface->refcount))
  88                 hard_iface = NULL;
  89
  90 out:
  91         rcu_read_unlock();
  92         return hard_iface;
  93 }
  94
  95 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */