LXR linux/net/batman-adv/hard-interface.h

   1/*
   2 * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
   3 *
   4 * Marek Lindner, Simon Wunderlich
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of version 2 of the GNU General Public
   8 * License as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful, but
  11 * WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13 * General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18 * 02110-1301, USA
  19 *
  20 */
  21
  22#ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
  23#define _NET_BATMAN_ADV_HARD_INTERFACE_H_
  24
  25enum hard_if_state {
  26        IF_NOT_IN_USE,
  27        IF_TO_BE_REMOVED,
  28        IF_INACTIVE,
  29        IF_ACTIVE,
  30        IF_TO_BE_ACTIVATED,
  31        IF_I_WANT_YOU
  32};
  33
  34extern struct notifier_block hard_if_notifier;
  35
  36struct hard_iface*
  37hardif_get_by_netdev(const struct net_device *net_dev);
  38int hardif_enable_interface(struct hard_iface *hard_iface,
  39                            const char *iface_name);
  40void hardif_disable_interface(struct hard_iface *hard_iface);
  41void hardif_remove_interfaces(void);
  42int hardif_min_mtu(struct net_device *soft_iface);
  43void update_min_mtu(struct net_device *soft_iface);
  44void hardif_free_rcu(struct rcu_head *rcu);
  45bool is_wifi_iface(int ifindex);
  46
  47static inline void hardif_free_ref(struct hard_iface *hard_iface)
  48{
  49        if (atomic_dec_and_test(&hard_iface->refcount))
  50                call_rcu(&hard_iface->rcu, hardif_free_rcu);
  51}
  52
  53static inline struct hard_iface *primary_if_get_selected(
  54                                                struct bat_priv *bat_priv)
  55{
  56        struct hard_iface *hard_iface;
  57
  58        rcu_read_lock();
  59        hard_iface = rcu_dereference(bat_priv->primary_if);
  60        if (!hard_iface)
  61                goto out;
  62
  63        if (!atomic_inc_not_zero(&hard_iface->refcount))
  64                hard_iface = NULL;
  65
  66out:
  67        rcu_read_unlock();
  68        return hard_iface;
  69}
  70
  71#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
  72