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
30struct net_device;
31
32enum 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 */
46enum batadv_hard_if_cleanup {
47	BATADV_IF_CLEANUP_KEEP,
48	BATADV_IF_CLEANUP_AUTO,
49};
50
51extern struct notifier_block batadv_hard_if_notifier;
52
53bool batadv_is_wifi_netdev(struct net_device *net_device);
54bool batadv_is_wifi_iface(int ifindex);
55struct batadv_hard_iface*
56batadv_hardif_get_by_netdev(const struct net_device *net_dev);
57int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
58				   const char *iface_name);
59void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
60				     enum batadv_hard_if_cleanup autodel);
61void batadv_hardif_remove_interfaces(void);
62int batadv_hardif_min_mtu(struct net_device *soft_iface);
63void batadv_update_min_mtu(struct net_device *soft_iface);
64void 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 */
71static inline void
72batadv_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
78static inline struct batadv_hard_iface *
79batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
80{
81	struct batadv_hard_iface *hard_iface;
82
83	rcu_read_lock();
84	hard_iface = rcu_dereference(bat_priv->primary_if);
85	if (!hard_iface)
86		goto out;
87
88	if (!atomic_inc_not_zero(&hard_iface->refcount))
89		hard_iface = NULL;
90
91out:
92	rcu_read_unlock();
93	return hard_iface;
94}
95
96#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
97