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 <linux/kref.h>
  12 #include <linux/rbtree.h>
  13 #include <net/genetlink.h>
  14 #include <net/wireless.h>
  15 #include <net/cfg80211.h>
  16 #include "reg.h"
  17
  18 struct cfg80211_registered_device {
  19         struct cfg80211_ops *ops;
  20         struct list_head list;
  21         /* we hold this mutex during any call so that
  22          * we cannot do multiple calls at once, and also
  23          * to avoid the deregister call to proceed while
  24          * any call is in progress */
  25         struct mutex mtx;
  26
  27         /* ISO / IEC 3166 alpha2 for which this device is receiving
  28          * country IEs on, this can help disregard country IEs from APs
  29          * on the same alpha2 quickly. The alpha2 may differ from
  30          * cfg80211_regdomain's alpha2 when an intersection has occurred.
  31          * If the AP is reconfigured this can also be used to tell us if
  32          * the country on the country IE changed. */
  33         char country_ie_alpha2[2];
  34
  35         /* If a Country IE has been received this tells us the environment
  36          * which its telling us its in. This defaults to ENVIRON_ANY */
  37         enum environment_cap env;
  38
  39         /* wiphy index, internal only */
  40         int idx;
  41
  42         /* associate netdev list */
  43         struct mutex devlist_mtx;
  44         struct list_head netdev_list;
  45
  46         /* BSSes/scanning */
  47         spinlock_t bss_lock;
  48         struct list_head bss_list;
  49         struct rb_root bss_tree;
  50         u32 bss_generation;
  51         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
  52
  53         /* must be last because of the way we do wiphy_priv(),
  54          * and it should at least be aligned to NETDEV_ALIGN */
  55         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
  56 };
  57
  58 static inline
  59 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  60 {
  61         BUG_ON(!wiphy);
  62         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  63 }
  64
  65 extern struct mutex cfg80211_drv_mutex;
  66 extern struct list_head cfg80211_drv_list;
  67
  68 struct cfg80211_internal_bss {
  69         struct list_head list;
  70         struct rb_node rbn;
  71         unsigned long ts;
  72         struct kref ref;
  73         /* must be last because of priv member */
  74         struct cfg80211_bss pub;
  75 };
  76
  77 /*
  78  * This function returns a pointer to the driver
  79  * that the genl_info item that is passed refers to.
  80  * If successful, it returns non-NULL and also locks
  81  * the driver's mutex!
  82  *
  83  * This means that you need to call cfg80211_put_dev()
  84  * before being allowed to acquire &cfg80211_drv_mutex!
  85  *
  86  * This is necessary because we need to lock the global
  87  * mutex to get an item off the list safely, and then
  88  * we lock the drv mutex so it doesn't go away under us.
  89  *
  90  * We don't want to keep cfg80211_drv_mutex locked
  91  * for all the time in order to allow requests on
  92  * other interfaces to go through at the same time.
  93  *
  94  * The result of this can be a PTR_ERR and hence must
  95  * be checked with IS_ERR() for errors.
  96  */
  97 extern struct cfg80211_registered_device *
  98 cfg80211_get_dev_from_info(struct genl_info *info);
  99
 100 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
 101 extern struct cfg80211_registered_device *
 102 cfg80211_get_dev_from_ifindex(int ifindex);
 103
 104 extern void cfg80211_put_dev(struct cfg80211_registered_device *drv);
 105
 106 /* free object */
 107 extern void cfg80211_dev_free(struct cfg80211_registered_device *drv);
 108
 109 extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
 110                                char *newname);
 111
 112 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 113 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby);
 114
 115 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 116
 117 #endif /* __NET_WIRELESS_CORE_H */