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 void batadv_hardif_remove_interfaces(void);
104 int batadv_hardif_min_mtu(struct net_device *soft_iface);
105 void batadv_update_min_mtu(struct net_device *soft_iface);
106 void batadv_hardif_release(struct kref *ref);
107 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
108 u8 *orig_addr, u8 *orig_neigh);
109
110 /**
111 * batadv_hardif_put() - decrement the hard interface refcounter and possibly
112 * release it
113 * @hard_iface: the hard interface to free
114 */
115 static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
116 {
117 kref_put(&hard_iface->refcount, batadv_hardif_release);
118 }
119
120 /**
121 * batadv_primary_if_get_selected() - Get reference to primary interface
122 * @bat_priv: the bat priv with all the soft interface information
123 *
124 * Return: primary interface (with increased refcnt), otherwise NULL
125 */
126 static inline struct batadv_hard_iface *
127 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
128 {
129 struct batadv_hard_iface *hard_iface;
130
131 rcu_read_lock();
132 hard_iface = rcu_dereference(bat_priv->primary_if);
133 if (!hard_iface)
134 goto out;
135
136 if (!kref_get_unless_zero(&hard_iface->refcount))
137 hard_iface = NULL;
138
139 out:
140 rcu_read_unlock();
141 return hard_iface;
142 }
143
144 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */
145
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