1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (C) 2007-2020  B.A.T.M.A.N. contributors:
3  *
4  * Marek Lindner, Simon Wunderlich
5  */
6 
7 #ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
8 #define _NET_BATMAN_ADV_HARD_INTERFACE_H_
9 
10 #include "main.h"
11 
12 #include <linux/compiler.h>
13 #include <linux/kref.h>
14 #include <linux/netdevice.h>
15 #include <linux/notifier.h>
16 #include <linux/rcupdate.h>
17 #include <linux/stddef.h>
18 #include <linux/types.h>
19 #include <net/net_namespace.h>
20 
21 /**
22  * enum batadv_hard_if_state - State of a hard interface
23  */
24 enum batadv_hard_if_state {
25 	/**
26 	 * @BATADV_IF_NOT_IN_USE: interface is not used as slave interface of a
27 	 * batman-adv soft interface
28 	 */
29 	BATADV_IF_NOT_IN_USE,
30 
31 	/**
32 	 * @BATADV_IF_TO_BE_REMOVED: interface will be removed from soft
33 	 * interface
34 	 */
35 	BATADV_IF_TO_BE_REMOVED,
36 
37 	/** @BATADV_IF_INACTIVE: interface is deactivated */
38 	BATADV_IF_INACTIVE,
39 
40 	/** @BATADV_IF_ACTIVE: interface is used */
41 	BATADV_IF_ACTIVE,
42 
43 	/** @BATADV_IF_TO_BE_ACTIVATED: interface is getting activated */
44 	BATADV_IF_TO_BE_ACTIVATED,
45 
46 	/**
47 	 * @BATADV_IF_I_WANT_YOU: interface is queued up (using sysfs) for being
48 	 * added as slave interface of a batman-adv soft interface
49 	 */
50 	BATADV_IF_I_WANT_YOU,
51 };
52 
53 /**
54  * enum batadv_hard_if_bcast - broadcast avoidance options
55  */
56 enum batadv_hard_if_bcast {
57 	/** @BATADV_HARDIF_BCAST_OK: Do broadcast on according hard interface */
58 	BATADV_HARDIF_BCAST_OK = 0,
59 
60 	/**
61 	 * @BATADV_HARDIF_BCAST_NORECIPIENT: Broadcast not needed, there is no
62 	 *  recipient
63 	 */
64 	BATADV_HARDIF_BCAST_NORECIPIENT,
65 
66 	/**
67 	 * @BATADV_HARDIF_BCAST_DUPFWD: There is just the neighbor we got it
68 	 *  from
69 	 */
70 	BATADV_HARDIF_BCAST_DUPFWD,
71 
72 	/** @BATADV_HARDIF_BCAST_DUPORIG: There is just the originator */
73 	BATADV_HARDIF_BCAST_DUPORIG,
74 };
75 
76 /**
77  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
78  */
79 enum batadv_hard_if_cleanup {
80 	/**
81 	 * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
82 	 */
83 	BATADV_IF_CLEANUP_KEEP,
84 
85 	/**
86 	 * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was
87 	 *  removed
88 	 */
89 	BATADV_IF_CLEANUP_AUTO,
90 };
91 
92 extern struct notifier_block batadv_hard_if_notifier;
93 
94 struct net_device *batadv_get_real_netdev(struct net_device *net_device);
95 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface);
96 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface);
97 struct batadv_hard_iface*
98 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
99 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
100 				   struct net *net, const char *iface_name);
101 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
102 				     enum batadv_hard_if_cleanup autodel);
103 int batadv_hardif_min_mtu(struct net_device *soft_iface);
104 void batadv_update_min_mtu(struct net_device *soft_iface);
105 void batadv_hardif_release(struct kref *ref);
106 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
107 			       u8 *orig_addr, u8 *orig_neigh);
108 
109 /**
110  * batadv_hardif_put() - decrement the hard interface refcounter and possibly
111  *  release it
112  * @hard_iface: the hard interface to free
113  */
114 static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
115 {
116 	kref_put(&hard_iface->refcount, batadv_hardif_release);
117 }
118 
119 /**
120  * batadv_primary_if_get_selected() - Get reference to primary interface
121  * @bat_priv: the bat priv with all the soft interface information
122  *
123  * Return: primary interface (with increased refcnt), otherwise NULL
124  */
125 static inline struct batadv_hard_iface *
126 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
127 {
128 	struct batadv_hard_iface *hard_iface;
129 
130 	rcu_read_lock();
131 	hard_iface = rcu_dereference(bat_priv->primary_if);
132 	if (!hard_iface)
133 		goto out;
134 
135 	if (!kref_get_unless_zero(&hard_iface->refcount))
136 		hard_iface = NULL;
137 
138 out:
139 	rcu_read_unlock();
140 	return hard_iface;
141 }
142 
143 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
144