1 /* Copyright (C) 2007-2015 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/atomic.h>
24 #include <linux/compiler.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 
32 enum batadv_hard_if_state {
33 	BATADV_IF_NOT_IN_USE,
34 	BATADV_IF_TO_BE_REMOVED,
35 	BATADV_IF_INACTIVE,
36 	BATADV_IF_ACTIVE,
37 	BATADV_IF_TO_BE_ACTIVATED,
38 	BATADV_IF_I_WANT_YOU,
39 };
40 
41 /**
42  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
43  * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
44  * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
45  */
46 enum batadv_hard_if_cleanup {
47 	BATADV_IF_CLEANUP_KEEP,
48 	BATADV_IF_CLEANUP_AUTO,
49 };
50 
51 extern struct notifier_block batadv_hard_if_notifier;
52 
53 bool batadv_is_wifi_netdev(struct net_device *net_device);
54 bool batadv_is_wifi_iface(int ifindex);
55 struct batadv_hard_iface*
56 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
57 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
58 				   const char *iface_name);
59 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
60 				     enum batadv_hard_if_cleanup autodel);
61 void batadv_hardif_remove_interfaces(void);
62 int batadv_hardif_min_mtu(struct net_device *soft_iface);
63 void batadv_update_min_mtu(struct net_device *soft_iface);
64 void batadv_hardif_free_rcu(struct rcu_head *rcu);
65 
66 /**
67  * batadv_hardif_free_ref - decrement the hard interface refcounter and
68  *  possibly free it
69  * @hard_iface: the hard interface to free
70  */
71 static inline void
72 batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface)
73 {
74 	if (atomic_dec_and_test(&hard_iface->refcount))
75 		call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu);
76 }
77 
78 /**
79  * batadv_hardif_free_ref_now - decrement the hard interface refcounter and
80  *  possibly free it (without rcu callback)
81  * @hard_iface: the hard interface to free
82  */
83 static inline void
84 batadv_hardif_free_ref_now(struct batadv_hard_iface *hard_iface)
85 {
86 	if (atomic_dec_and_test(&hard_iface->refcount))
87 		batadv_hardif_free_rcu(&hard_iface->rcu);
88 }
89 
90 static inline struct batadv_hard_iface *
91 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
92 {
93 	struct batadv_hard_iface *hard_iface;
94 
95 	rcu_read_lock();
96 	hard_iface = rcu_dereference(bat_priv->primary_if);
97 	if (!hard_iface)
98 		goto out;
99 
100 	if (!atomic_inc_not_zero(&hard_iface->refcount))
101 		hard_iface = NULL;
102 
103 out:
104 	rcu_read_unlock();
105 	return hard_iface;
106 }
107 
108 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
109