net/wireless/core.h

   1 /*
   2  * Wireless configuration interface internals.
   3  *
   4  * Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net>
   5  */
   6 #ifndef __NET_WIRELESS_CORE_H
   7 #define __NET_WIRELESS_CORE_H
   8 #include <linux/mutex.h>
   9 #include <linux/list.h>
  10 #include <linux/netdevice.h>
  11 #include <net/genetlink.h>
  12 #include <net/wireless.h>
  13 #include <net/cfg80211.h>
  14
  15 struct cfg80211_registered_device {
  16         struct cfg80211_ops *ops;
  17         struct list_head list;
  18         /* we hold this mutex during any call so that
  19          * we cannot do multiple calls at once, and also
  20          * to avoid the deregister call to proceed while
  21          * any call is in progress */
  22         struct mutex mtx;
  23
  24         /* wiphy index, internal only */
  25         int idx;
  26
  27         /* associate netdev list */
  28         struct mutex devlist_mtx;
  29         struct list_head netdev_list;
  30
  31         /* must be last because of the way we do wiphy_priv(),
  32          * and it should at least be aligned to NETDEV_ALIGN */
  33         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
  34 };
  35
  36 static inline
  37 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  38 {
  39         BUG_ON(!wiphy);
  40         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  41 }
  42
  43 extern struct mutex cfg80211_drv_mutex;
  44 extern struct list_head cfg80211_drv_list;
  45
  46 /*
  47  * This function returns a pointer to the driver
  48  * that the genl_info item that is passed refers to.
  49  * If successful, it returns non-NULL and also locks
  50  * the driver's mutex!
  51  *
  52  * This means that you need to call cfg80211_put_dev()
  53  * before being allowed to acquire &cfg80211_drv_mutex!
  54  *
  55  * This is necessary because we need to lock the global
  56  * mutex to get an item off the list safely, and then
  57  * we lock the drv mutex so it doesn't go away under us.
  58  *
  59  * We don't want to keep cfg80211_drv_mutex locked
  60  * for all the time in order to allow requests on
  61  * other interfaces to go through at the same time.
  62  *
  63  * The result of this can be a PTR_ERR and hence must
  64  * be checked with IS_ERR() for errors.
  65  */
  66 extern struct cfg80211_registered_device *
  67 cfg80211_get_dev_from_info(struct genl_info *info);
  68
  69 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
  70 extern struct cfg80211_registered_device *
  71 cfg80211_get_dev_from_ifindex(int ifindex);
  72
  73 extern void cfg80211_put_dev(struct cfg80211_registered_device *drv);
  74
  75 /* free object */
  76 extern void cfg80211_dev_free(struct cfg80211_registered_device *drv);
  77
  78 extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
  79                                char *newname);
  80
  81 #endif /* __NET_WIRELESS_CORE_H */