1/* SPDX-License-Identifier: GPL-2.0 */
  2/* Copyright (C) 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
 20/**
 21 * enum batadv_hard_if_state - State of a hard interface
 22 */
 23enum batadv_hard_if_state {
 24	/**
 25	 * @BATADV_IF_NOT_IN_USE: interface is not used as slave interface of a
 26	 * batman-adv soft interface
 27	 */
 28	BATADV_IF_NOT_IN_USE,
 29
 30	/**
 31	 * @BATADV_IF_TO_BE_REMOVED: interface will be removed from soft
 32	 * interface
 33	 */
 34	BATADV_IF_TO_BE_REMOVED,
 35
 36	/** @BATADV_IF_INACTIVE: interface is deactivated */
 37	BATADV_IF_INACTIVE,
 38
 39	/** @BATADV_IF_ACTIVE: interface is used */
 40	BATADV_IF_ACTIVE,
 41
 42	/** @BATADV_IF_TO_BE_ACTIVATED: interface is getting activated */
 43	BATADV_IF_TO_BE_ACTIVATED,
 44};
 45
 46/**
 47 * enum batadv_hard_if_bcast - broadcast avoidance options
 48 */
 49enum batadv_hard_if_bcast {
 50	/** @BATADV_HARDIF_BCAST_OK: Do broadcast on according hard interface */
 51	BATADV_HARDIF_BCAST_OK = 0,
 52
 53	/**
 54	 * @BATADV_HARDIF_BCAST_NORECIPIENT: Broadcast not needed, there is no
 55	 *  recipient
 56	 */
 57	BATADV_HARDIF_BCAST_NORECIPIENT,
 58
 59	/**
 60	 * @BATADV_HARDIF_BCAST_DUPFWD: There is just the neighbor we got it
 61	 *  from
 62	 */
 63	BATADV_HARDIF_BCAST_DUPFWD,
 64
 65	/** @BATADV_HARDIF_BCAST_DUPORIG: There is just the originator */
 66	BATADV_HARDIF_BCAST_DUPORIG,
 67};
 68
 69extern struct notifier_block batadv_hard_if_notifier;
 70
 71struct net_device *batadv_get_real_netdev(struct net_device *net_device);
 72bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface);
 73bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface);
 74struct batadv_hard_iface*
 75batadv_hardif_get_by_netdev(const struct net_device *net_dev);
 76int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 77				   struct net_device *soft_iface);
 78void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface);
 79int batadv_hardif_min_mtu(struct net_device *soft_iface);
 80void batadv_update_min_mtu(struct net_device *soft_iface);
 81void batadv_hardif_release(struct kref *ref);
 82int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
 83			       u8 *orig_addr, u8 *orig_neigh);
 84
 85/**
 86 * batadv_hardif_put() - decrement the hard interface refcounter and possibly
 87 *  release it
 88 * @hard_iface: the hard interface to free
 89 */
 90static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
 91{
 92	if (!hard_iface)
 93		return;
 94
 95	kref_put(&hard_iface->refcount, batadv_hardif_release);
 96}
 97
 98/**
 99 * batadv_primary_if_get_selected() - Get reference to primary interface
100 * @bat_priv: the bat priv with all the soft interface information
101 *
102 * Return: primary interface (with increased refcnt), otherwise NULL
103 */
104static inline struct batadv_hard_iface *
105batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
106{
107	struct batadv_hard_iface *hard_iface;
108
109	rcu_read_lock();
110	hard_iface = rcu_dereference(bat_priv->primary_if);
111	if (!hard_iface)
112		goto out;
113
114	if (!kref_get_unless_zero(&hard_iface->refcount))
115		hard_iface = NULL;
116
117out:
118	rcu_read_unlock();
119	return hard_iface;
120}
121
122#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */