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 #include "reg.h"
  15
  16 struct cfg80211_registered_device {
  17         struct cfg80211_ops *ops;
  18         struct list_head list;
  19         /* we hold this mutex during any call so that
  20          * we cannot do multiple calls at once, and also
  21          * to avoid the deregister call to proceed while
  22          * any call is in progress */
  23         struct mutex mtx;
  24
  25         /* ISO / IEC 3166 alpha2 for which this device is receiving
  26          * country IEs on, this can help disregard country IEs from APs
  27          * on the same alpha2 quickly. The alpha2 may differ from
  28          * cfg80211_regdomain's alpha2 when an intersection has occurred.
  29          * If the AP is reconfigured this can also be used to tell us if
  30          * the country on the country IE changed. */
  31         char country_ie_alpha2[2];
  32
  33         /* If a Country IE has been received this tells us the environment
  34          * which its telling us its in. This defaults to ENVIRON_ANY */
  35         enum environment_cap env;
  36
  37         /* wiphy index, internal only */
  38         int idx;
  39
  40         /* associate netdev list */
  41         struct mutex devlist_mtx;
  42         struct list_head netdev_list;
  43
  44         /* must be last because of the way we do wiphy_priv(),
  45          * and it should at least be aligned to NETDEV_ALIGN */
  46         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
  47 };
  48
  49 static inline
  50 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  51 {
  52         BUG_ON(!wiphy);
  53         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  54 }
  55
  56 extern struct mutex cfg80211_drv_mutex;
  57 extern struct list_head cfg80211_drv_list;
  58
  59 /*
  60  * This function returns a pointer to the driver
  61  * that the genl_info item that is passed refers to.
  62  * If successful, it returns non-NULL and also locks
  63  * the driver's mutex!
  64  *
  65  * This means that you need to call cfg80211_put_dev()
  66  * before being allowed to acquire &cfg80211_drv_mutex!
  67  *
  68  * This is necessary because we need to lock the global
  69  * mutex to get an item off the list safely, and then
  70  * we lock the drv mutex so it doesn't go away under us.
  71  *
  72  * We don't want to keep cfg80211_drv_mutex locked
  73  * for all the time in order to allow requests on
  74  * other interfaces to go through at the same time.
  75  *
  76  * The result of this can be a PTR_ERR and hence must
  77  * be checked with IS_ERR() for errors.
  78  */
  79 extern struct cfg80211_registered_device *
  80 cfg80211_get_dev_from_info(struct genl_info *info);
  81
  82 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
  83 extern struct cfg80211_registered_device *
  84 cfg80211_get_dev_from_ifindex(int ifindex);
  85
  86 extern void cfg80211_put_dev(struct cfg80211_registered_device *drv);
  87
  88 /* free object */
  89 extern void cfg80211_dev_free(struct cfg80211_registered_device *drv);
  90
  91 extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
  92                                char *newname);
  93
  94 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
  95 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby);
  96
  97 #endif /* __NET_WIRELESS_CORE_H */