core.h

linux 内核源代码

/*
 * Wireless configuration interface internals.
 *
 * Copyright 2006, 2007 Johannes Berg <[e-mail]>
 */
#ifndef __NET_WIRELESS_CORE_H
#define __NET_WIRELESS_CORE_H
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <net/genetlink.h>
#include <net/wireless.h>
#include <net/cfg80211.h>

struct cfg80211_registered_device {
	struct cfg80211_ops *ops;
	struct list_head list;
	/* we hold this mutex during any call so that
	 * we cannot do multiple calls at once, and also
	 * to avoid the deregister call to proceed while
	 * any call is in progress */
	struct mutex mtx;

	/* wiphy index, internal only */
	int idx;

	/* associate netdev list */
	struct mutex devlist_mtx;
	struct list_head netdev_list;

	/* must be last because of the way we do wiphy_priv(),
	 * and it should at least be aligned to NETDEV_ALIGN */
	struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
};

static inline
struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
{
	BUG_ON(!wiphy);
	return container_of(wiphy, struct cfg80211_registered_device, wiphy);
}

extern struct mutex cfg80211_drv_mutex;
extern struct list_head cfg80211_drv_list;

/*
 * This function returns a pointer to the driver
 * that the genl_info item that is passed refers to.
 * If successful, it returns non-NULL and also locks
 * the driver's mutex!
 *
 * This means that you need to call cfg80211_put_dev()
 * before being allowed to acquire &cfg80211_drv_mutex!
 *
 * This is necessary because we need to lock the global
 * mutex to get an item off the list safely, and then
 * we lock the drv mutex so it doesn't go away under us.
 *
 * We don't want to keep cfg80211_drv_mutex locked
 * for all the time in order to allow requests on
 * other interfaces to go through at the same time.
 *
 * The result of this can be a PTR_ERR and hence must
 * be checked with IS_ERR() for errors.
 */
extern struct cfg80211_registered_device *
cfg80211_get_dev_from_info(struct genl_info *info);

/* identical to cfg80211_get_dev_from_info but only operate on ifindex */
extern struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(int ifindex);

extern void cfg80211_put_dev(struct cfg80211_registered_device *drv);

/* free object */
extern void cfg80211_dev_free(struct cfg80211_registered_device *drv);

extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
			       char *newname);

#endif /* __NET_WIRELESS_CORE_H */