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32ae9b221e
The rcu protected macros rcu_dereference() and rcu_assign_pointer() for the bat_priv->primary_if need to be used, as well as spin/rcu locking. Otherwise we might end up using a primary_if pointer pointing to already freed memory. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/*
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* Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
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#define _NET_BATMAN_ADV_HARD_INTERFACE_H_
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#define IF_NOT_IN_USE 0
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#define IF_TO_BE_REMOVED 1
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#define IF_INACTIVE 2
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#define IF_ACTIVE 3
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#define IF_TO_BE_ACTIVATED 4
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#define IF_I_WANT_YOU 5
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extern struct notifier_block hard_if_notifier;
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struct hard_iface *hardif_get_by_netdev(struct net_device *net_dev);
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int hardif_enable_interface(struct hard_iface *hard_iface, char *iface_name);
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void hardif_disable_interface(struct hard_iface *hard_iface);
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void hardif_remove_interfaces(void);
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int hardif_min_mtu(struct net_device *soft_iface);
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void update_min_mtu(struct net_device *soft_iface);
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void hardif_free_rcu(struct rcu_head *rcu);
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static inline void hardif_free_ref(struct hard_iface *hard_iface)
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{
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if (atomic_dec_and_test(&hard_iface->refcount))
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call_rcu(&hard_iface->rcu, hardif_free_rcu);
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}
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static inline struct hard_iface *primary_if_get_selected(
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struct bat_priv *bat_priv)
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{
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struct hard_iface *hard_iface;
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rcu_read_lock();
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hard_iface = rcu_dereference(bat_priv->primary_if);
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if (!hard_iface)
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goto out;
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if (!atomic_inc_not_zero(&hard_iface->refcount))
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hard_iface = NULL;
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out:
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rcu_read_unlock();
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return hard_iface;
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}
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#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
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