net/batman-adv/hard-interface.h

   1 /* Copyright (C) 2007-2017  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/compiler.h>
  24 #include <linux/kref.h>
  25 #include <linux/notifier.h>
  26 #include <linux/rcupdate.h>
  27 #include <linux/stddef.h>
  28 #include <linux/types.h>
  29
  30 struct net_device;
  31 struct net;
  32
  33 enum batadv_hard_if_state {
  34         BATADV_IF_NOT_IN_USE,
  35         BATADV_IF_TO_BE_REMOVED,
  36         BATADV_IF_INACTIVE,
  37         BATADV_IF_ACTIVE,
  38         BATADV_IF_TO_BE_ACTIVATED,
  39         BATADV_IF_I_WANT_YOU,
  40 };
  41
  42 /**
  43  * enum batadv_hard_if_bcast - broadcast avoidance options
  44  * @BATADV_HARDIF_BCAST_OK: Do broadcast on according hard interface
  45  * @BATADV_HARDIF_BCAST_NORECIPIENT: Broadcast not needed, there is no recipient
  46  * @BATADV_HARDIF_BCAST_DUPFWD: There is just the neighbor we got it from
  47  * @BATADV_HARDIF_BCAST_DUPORIG: There is just the originator
  48  */
  49 enum batadv_hard_if_bcast {
  50         BATADV_HARDIF_BCAST_OK = 0,
  51         BATADV_HARDIF_BCAST_NORECIPIENT,
  52         BATADV_HARDIF_BCAST_DUPFWD,
  53         BATADV_HARDIF_BCAST_DUPORIG,
  54 };
  55
  56 /**
  57  * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
  58  * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
  59  * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
  60  */
  61 enum batadv_hard_if_cleanup {
  62         BATADV_IF_CLEANUP_KEEP,
  63         BATADV_IF_CLEANUP_AUTO,
  64 };
  65
  66 extern struct notifier_block batadv_hard_if_notifier;
  67
  68 struct net_device *batadv_get_real_netdev(struct net_device *net_device);
  69 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface);
  70 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface);
  71 struct batadv_hard_iface*
  72 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
  73 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
  74                                    struct net *net, const char *iface_name);
  75 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
  76                                      enum batadv_hard_if_cleanup autodel);
  77 void batadv_hardif_remove_interfaces(void);
  78 int batadv_hardif_min_mtu(struct net_device *soft_iface);
  79 void batadv_update_min_mtu(struct net_device *soft_iface);
  80 void batadv_hardif_release(struct kref *ref);
  81 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
  82                                u8 *orig_addr, u8 *orig_neigh);
  83
  84 /**
  85  * batadv_hardif_put - decrement the hard interface refcounter and possibly
  86  *  release it
  87  * @hard_iface: the hard interface to free
  88  */
  89 static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
  90 {
  91         kref_put(&hard_iface->refcount, batadv_hardif_release);
  92 }
  93
  94 static inline struct batadv_hard_iface *
  95 batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
  96 {
  97         struct batadv_hard_iface *hard_iface;
  98
  99         rcu_read_lock();
 100         hard_iface = rcu_dereference(bat_priv->primary_if);
 101         if (!hard_iface)
 102                 goto out;
 103
 104         if (!kref_get_unless_zero(&hard_iface->refcount))
 105                 hard_iface = NULL;
 106
 107 out:
 108         rcu_read_unlock();
 109         return hard_iface;
 110 }
 111
 112 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */