/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 */

#ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
#define _NET_BATMAN_ADV_HARD_INTERFACE_H_

#include "main.h"

#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/kref.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include <linux/stddef.h>
#include <linux/types.h>

/**
 * enum batadv_hard_if_state - State of a hard interface
 */
enum batadv_hard_if_state {
	/**
	 * @BATADV_IF_TO_BE_REMOVED: interface will be removed from mesh
	 * interface
	 */
	BATADV_IF_TO_BE_REMOVED,

	/** @BATADV_IF_INACTIVE: interface is deactivated */
	BATADV_IF_INACTIVE,

	/** @BATADV_IF_ACTIVE: interface is used */
	BATADV_IF_ACTIVE,

	/** @BATADV_IF_TO_BE_ACTIVATED: interface is getting activated */
	BATADV_IF_TO_BE_ACTIVATED,
};

/**
 * enum batadv_hard_if_bcast - broadcast avoidance options
 */
enum batadv_hard_if_bcast {
	/** @BATADV_HARDIF_BCAST_OK: Do broadcast on according hard interface */
	BATADV_HARDIF_BCAST_OK = 0,

	/**
	 * @BATADV_HARDIF_BCAST_NORECIPIENT: Broadcast not needed, there is no
	 *  recipient
	 */
	BATADV_HARDIF_BCAST_NORECIPIENT,

	/**
	 * @BATADV_HARDIF_BCAST_DUPFWD: There is just the neighbor we got it
	 *  from
	 */
	BATADV_HARDIF_BCAST_DUPFWD,

	/** @BATADV_HARDIF_BCAST_DUPORIG: There is just the originator */
	BATADV_HARDIF_BCAST_DUPORIG,
};

extern struct notifier_block batadv_hard_if_notifier;

struct net_device *__batadv_get_real_netdev(struct net_device *net_device);
struct net_device *batadv_get_real_netdev(struct net_device *net_device);
u32 batadv_netdev_get_wifi_flags(struct net_device *net_dev);
u32 batadv_hardif_get_wifi_flags(struct batadv_hard_iface *hard_iface);
bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface);
struct batadv_hard_iface*
batadv_hardif_get_by_netdev(struct net_device *net_dev);
int batadv_hardif_enable_interface(struct net_device *net_dev,
				   struct net_device *mesh_iface);
void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface);
int batadv_hardif_min_mtu(struct net_device *mesh_iface);
void batadv_update_min_mtu(struct net_device *mesh_iface);
void batadv_hardif_release(struct kref *ref);
int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
			       u8 *orig_addr, u8 *orig_neigh);
int __init batadv_wifi_net_devices_init(void);
void batadv_wifi_net_devices_deinit(void);

/**
 * batadv_hardif_put() - decrement the hard interface refcounter and possibly
 *  release it
 * @hard_iface: the hard interface to free
 */
static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface)
{
	if (!hard_iface)
		return;

	kref_put(&hard_iface->refcount, batadv_hardif_release);
}

/**
 * batadv_primary_if_get_selected() - Get reference to primary interface
 * @bat_priv: the bat priv with all the mesh interface information
 *
 * Return: primary interface (with increased refcnt), otherwise NULL
 */
static inline struct batadv_hard_iface *
batadv_primary_if_get_selected(struct batadv_priv *bat_priv)
{
	struct batadv_hard_iface *hard_iface;

	rcu_read_lock();
	hard_iface = rcu_dereference(bat_priv->primary_if);
	if (!hard_iface)
		goto out;

	if (!kref_get_unless_zero(&hard_iface->refcount))
		hard_iface = NULL;

out:
	rcu_read_unlock();
	return hard_iface;
}

/**
 * batadv_is_cfg80211() - check if the given hardif is a cfg80211
 *  wifi interface
 * @wifi_flags: extracted batadv_hard_iface_wifi_flags of a net_device
 *
 * Return: true if the net device is a cfg80211 wireless device, false
 *  otherwise.
 */
static inline bool batadv_is_cfg80211(u32 wifi_flags)
{
	u32 allowed_flags = 0;

	allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
	allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;

	return !!(wifi_flags & allowed_flags);
}

/**
 * batadv_is_wifi() - check if flags belong to wifi interface
 * @wifi_flags: extracted batadv_hard_iface_wifi_flags of a net_device
 *
 * Return: true if the net device is a 802.11 wireless device, false otherwise.
 */
static inline bool batadv_is_wifi(u32 wifi_flags)
{
	return wifi_flags != 0;
}

#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */