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          * @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_ */