net/batman-adv/hard-interface.h

   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 /**
  48  * enum batadv_hard_if_bcast - broadcast avoidance options
  49  */
  50 enum batadv_hard_if_bcast {
  51         /** @BATADV_HARDIF_BCAST_OK: Do broadcast on according hard interface */
  52         BATADV_HARDIF_BCAST_OK = 0,
  53
  54         /**
  55          * @BATADV_HARDIF_BCAST_NORECIPIENT: Broadcast not needed, there is no
  56          *  recipient
  57          */
  58         BATADV_HARDIF_BCAST_NORECIPIENT,
  59
  60         /**
  61          * @BATADV_HARDIF_BCAST_DUPFWD: There is just the neighbor we got it
  62          *  from
  63          */
  64         BATADV_HARDIF_BCAST_DUPFWD,
  65
  66         /** @BATADV_HARDIF_BCAST_DUPORIG: There is just the originator */
  67         BATADV_HARDIF_BCAST_DUPORIG,
  68 };
  69
  70 extern struct notifier_block batadv_hard_if_notifier;
  71
  72 struct net_device *batadv_get_real_netdev(struct net_device *net_device);
  73 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface);
  74 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface);
  75 struct batadv_hard_iface*
  76 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
  77 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
  78                                    struct net *net, const char *iface_name);
  79 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface);
  80 int batadv_hardif_min_mtu(struct net_device *soft_iface);
  81 void batadv_update_min_mtu(struct net_device *soft_iface);
  82 void batadv_hardif_release(struct kref *ref);
  83 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
  84                                u8 *orig_addr, u8 *orig_neigh);
  85
  86 /**
  87  * batadv_hardif_put() - decrement the hard interface refcounter and possibly
  88  *  release it
  89  * @hard_iface: the hard interface to free
  90  */
  91 static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
  92 {
  93         kref_put(&hard_iface->refcount, batadv_hardif_release);
  94 }
  95
  96 /**
  97  * batadv_primary_if_get_selected() - Get reference to primary interface
  98  * @bat_priv: the bat priv with all the soft interface information
  99  *
 100  * Return: primary interface (with increased refcnt), otherwise NULL
 101  */
 102 static inline struct batadv_hard_iface *
 103 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
 104 {
 105         struct batadv_hard_iface *hard_iface;
 106
 107         rcu_read_lock();
 108         hard_iface = rcu_dereference(bat_priv->primary_if);
 109         if (!hard_iface)
 110                 goto out;
 111
 112         if (!kref_get_unless_zero(&hard_iface->refcount))
 113                 hard_iface = NULL;
 114
 115 out:
 116         rcu_read_unlock();
 117         return hard_iface;
 118 }
 119
 120 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */