1 /* Copyright (C) 2007-2016  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 #include "main.h"
22 
23 #include <linux/compiler.h>
24 #include <linux/kref.h>
25 #include <linux/notifier.h>
26 #include <linux/rcupdate.h>
27 #include <linux/stddef.h>
28 #include <linux/types.h>
29 
30 struct net_device;
31 struct net;
32 
33 enum batadv_hard_if_state {
34 	BATADV_IF_NOT_IN_USE,
35 	BATADV_IF_TO_BE_REMOVED,
36 	BATADV_IF_INACTIVE,
37 	BATADV_IF_ACTIVE,
38 	BATADV_IF_TO_BE_ACTIVATED,
39 	BATADV_IF_I_WANT_YOU,
40 };
41 
42 /**
43  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
44  * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
45  * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
46  */
47 enum batadv_hard_if_cleanup {
48 	BATADV_IF_CLEANUP_KEEP,
49 	BATADV_IF_CLEANUP_AUTO,
50 };
51 
52 extern struct notifier_block batadv_hard_if_notifier;
53 
54 bool batadv_is_wifi_netdev(struct net_device *net_device);
55 bool batadv_is_wifi_iface(int ifindex);
56 struct batadv_hard_iface*
57 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
58 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
59 				   struct net *net, const char *iface_name);
60 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
61 				     enum batadv_hard_if_cleanup autodel);
62 void batadv_hardif_remove_interfaces(void);
63 int batadv_hardif_min_mtu(struct net_device *soft_iface);
64 void batadv_update_min_mtu(struct net_device *soft_iface);
65 void batadv_hardif_release(struct kref *ref);
66 
67 /**
68  * batadv_hardif_put - decrement the hard interface refcounter and possibly
69  *  release it
70  * @hard_iface: the hard interface to free
71  */
72 static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
73 {
74 	kref_put(&hard_iface->refcount, batadv_hardif_release);
75 }
76 
77 static inline struct batadv_hard_iface *
78 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
79 {
80 	struct batadv_hard_iface *hard_iface;
81 
82 	rcu_read_lock();
83 	hard_iface = rcu_dereference(bat_priv->primary_if);
84 	if (!hard_iface)
85 		goto out;
86 
87 	if (!kref_get_unless_zero(&hard_iface->refcount))
88 		hard_iface = NULL;
89 
90 out:
91 	rcu_read_unlock();
92 	return hard_iface;
93 }
94 
95 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
96