net/batman-adv/hard-interface.h

   1 /* Copyright (C) 2007-2015 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/atomic.h>
  24 #include <linux/compiler.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
  32 enum batadv_hard_if_state {
  33         BATADV_IF_NOT_IN_USE,
  34         BATADV_IF_TO_BE_REMOVED,
  35         BATADV_IF_INACTIVE,
  36         BATADV_IF_ACTIVE,
  37         BATADV_IF_TO_BE_ACTIVATED,
  38         BATADV_IF_I_WANT_YOU,
  39 };
  40
  41 /**
  42  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
  43  * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
  44  * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
  45  */
  46 enum batadv_hard_if_cleanup {
  47         BATADV_IF_CLEANUP_KEEP,
  48         BATADV_IF_CLEANUP_AUTO,
  49 };
  50
  51 extern struct notifier_block batadv_hard_if_notifier;
  52
  53 bool batadv_is_wifi_netdev(struct net_device *net_device);
  54 bool batadv_is_wifi_iface(int ifindex);
  55 struct batadv_hard_iface*
  56 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
  57 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
  58                                    const char *iface_name);
  59 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
  60                                      enum batadv_hard_if_cleanup autodel);
  61 void batadv_hardif_remove_interfaces(void);
  62 int batadv_hardif_min_mtu(struct net_device *soft_iface);
  63 void batadv_update_min_mtu(struct net_device *soft_iface);
  64 void batadv_hardif_free_rcu(struct rcu_head *rcu);
  65
  66 /**
  67  * batadv_hardif_free_ref - decrement the hard interface refcounter and
  68  *  possibly free it
  69  * @hard_iface: the hard interface to free
  70  */
  71 static inline void
  72 batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
  73 {
  74         if (atomic_dec_and_test(&hard_iface->refcount))
  75                 call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
  76 }
  77
  78 /**
  79  * batadv_hardif_free_ref_now - decrement the hard interface refcounter and
  80  *  possibly free it (without rcu callback)
  81  * @hard_iface: the hard interface to free
  82  */
  83 static inline void
  84 batadv_hardif_free_ref_now(struct batadv_hard_iface *hard_iface)
  85 {
  86         if (atomic_dec_and_test(&hard_iface->refcount))
  87                 batadv_hardif_free_rcu(&hard_iface->rcu);
  88 }
  89
  90 static inline struct batadv_hard_iface *
  91 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
  92 {
  93         struct batadv_hard_iface *hard_iface;
  94
  95         rcu_read_lock();
  96         hard_iface = rcu_dereference(bat_priv->primary_if);
  97         if (!hard_iface)
  98                 goto out;
  99
 100         if (!atomic_inc_not_zero(&hard_iface->refcount))
 101                 hard_iface = NULL;
 102
 103 out:
 104         rcu_read_unlock();
 105         return hard_iface;
 106 }
 107
 108 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */