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 
25 enum 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 
34 extern struct notifier_block hard_if_notifier;
35 
36 struct hard_iface*
37 hardif_get_by_netdev(const struct net_device *net_dev);
38 int hardif_enable_interface(struct hard_iface *hard_iface,
39 			    const char *iface_name);
40 void hardif_disable_interface(struct hard_iface *hard_iface);
41 void hardif_remove_interfaces(void);
42 int hardif_min_mtu(struct net_device *soft_iface);
43 void update_min_mtu(struct net_device *soft_iface);
44 void hardif_free_rcu(struct rcu_head *rcu);
45 bool is_wifi_iface(int ifindex);
46 
47 static 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 
53 static 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 
66 out:
67 	rcu_read_unlock();
68 	return hard_iface;
69 }
70 
71 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
72