LXR linux/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
  23enum 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
  32extern struct notifier_block batadv_hard_if_notifier;
  33
  34struct batadv_hard_iface*
  35batadv_hardif_get_by_netdev(const struct net_device *net_dev);
  36int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
  37                                   const char *iface_name);
  38void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface);
  39void batadv_hardif_remove_interfaces(void);
  40int batadv_hardif_min_mtu(struct net_device *soft_iface);
  41void batadv_update_min_mtu(struct net_device *soft_iface);
  42void batadv_hardif_free_rcu(struct rcu_head *rcu);
  43bool batadv_is_wifi_iface(int ifindex);
  44
  45static inline void
  46batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
  47{
  48        if (atomic_dec_and_test(&hard_iface->refcount))
  49                call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
  50}
  51
  52static inline struct batadv_hard_iface *
  53batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
  54{
  55        struct batadv_hard_iface *hard_iface;
  56
  57        rcu_read_lock();
  58        hard_iface = rcu_dereference(bat_priv->primary_if);
  59        if (!hard_iface)
  60                goto out;
  61
  62        if (!atomic_inc_not_zero(&hard_iface->refcount))
  63                hard_iface = NULL;
  64
  65out:
  66        rcu_read_unlock();
  67        return hard_iface;
  68}
  69
  70#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
  71