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 wiphy_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         unsigned long suspend_at;
  53
  54         /* must be last because of the way we do wiphy_priv(),
  55          * and it should at least be aligned to NETDEV_ALIGN */
  56         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
  57 };
  58
  59 static inline
  60 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  61 {
  62         BUG_ON(!wiphy);
  63         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  64 }
  65
  66 extern struct mutex cfg80211_drv_mutex;
  67 extern struct list_head cfg80211_drv_list;
  68
  69 struct cfg80211_internal_bss {
  70         struct list_head list;
  71         struct rb_node rbn;
  72         unsigned long ts;
  73         struct kref ref;
  74         /* must be last because of priv member */
  75         struct cfg80211_bss pub;
  76 };
  77
  78 /*
  79  * This function returns a pointer to the driver
  80  * that the genl_info item that is passed refers to.
  81  * If successful, it returns non-NULL and also locks
  82  * the driver's mutex!
  83  *
  84  * This means that you need to call cfg80211_put_dev()
  85  * before being allowed to acquire &cfg80211_drv_mutex!
  86  *
  87  * This is necessary because we need to lock the global
  88  * mutex to get an item off the list safely, and then
  89  * we lock the drv mutex so it doesn't go away under us.
  90  *
  91  * We don't want to keep cfg80211_drv_mutex locked
  92  * for all the time in order to allow requests on
  93  * other interfaces to go through at the same time.
  94  *
  95  * The result of this can be a PTR_ERR and hence must
  96  * be checked with IS_ERR() for errors.
  97  */
  98 extern struct cfg80211_registered_device *
  99 cfg80211_get_dev_from_info(struct genl_info *info);
 100
 101 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
 102 extern struct cfg80211_registered_device *
 103 cfg80211_get_dev_from_ifindex(int ifindex);
 104
 105 extern void cfg80211_put_dev(struct cfg80211_registered_device *drv);
 106
 107 /* free object */
 108 extern void cfg80211_dev_free(struct cfg80211_registered_device *drv);
 109
 110 extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
 111                                char *newname);
 112
 113 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 114 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby);
 115
 116 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 117 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 118                       unsigned long age_secs);
 119
 120 #endif /* __NET_WIRELESS_CORE_H */