1 /* Copyright (C) 2007-2014 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 enum batadv_hard_if_state {
22 	BATADV_IF_NOT_IN_USE,
23 	BATADV_IF_TO_BE_REMOVED,
24 	BATADV_IF_INACTIVE,
25 	BATADV_IF_ACTIVE,
26 	BATADV_IF_TO_BE_ACTIVATED,
27 	BATADV_IF_I_WANT_YOU,
28 };
29 
30 /**
31  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
32  * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
33  * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
34  */
35 enum batadv_hard_if_cleanup {
36 	BATADV_IF_CLEANUP_KEEP,
37 	BATADV_IF_CLEANUP_AUTO,
38 };
39 
40 extern struct notifier_block batadv_hard_if_notifier;
41 
42 bool batadv_is_wifi_netdev(struct net_device *net_device);
43 bool batadv_is_wifi_iface(int ifindex);
44 struct batadv_hard_iface*
45 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
46 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
47 				   const char *iface_name);
48 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
49 				     enum batadv_hard_if_cleanup autodel);
50 void batadv_hardif_remove_interfaces(void);
51 int batadv_hardif_min_mtu(struct net_device *soft_iface);
52 void batadv_update_min_mtu(struct net_device *soft_iface);
53 void batadv_hardif_free_rcu(struct rcu_head *rcu);
54 
55 /**
56  * batadv_hardif_free_ref - decrement the hard interface refcounter and
57  *  possibly free it
58  * @hard_iface: the hard interface to free
59  */
60 static inline void
61 batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
62 {
63 	if (atomic_dec_and_test(&hard_iface->refcount))
64 		call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
65 }
66 
67 /**
68  * batadv_hardif_free_ref_now - decrement the hard interface refcounter and
69  *  possibly free it (without rcu callback)
70  * @hard_iface: the hard interface to free
71  */
72 static inline void
73 batadv_hardif_free_ref_now(struct batadv_hard_iface *hard_iface)
74 {
75 	if (atomic_dec_and_test(&hard_iface->refcount))
76 		batadv_hardif_free_rcu(&hard_iface->rcu);
77 }
78 
79 static inline struct batadv_hard_iface *
80 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
81 {
82 	struct batadv_hard_iface *hard_iface;
83 
84 	rcu_read_lock();
85 	hard_iface = rcu_dereference(bat_priv->primary_if);
86 	if (!hard_iface)
87 		goto out;
88 
89 	if (!atomic_inc_not_zero(&hard_iface->refcount))
90 		hard_iface = NULL;
91 
92 out:
93 	rcu_read_unlock();
94 	return hard_iface;
95 }
96 
97 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
98