net/wireless/core.h

   1 /*
   2  * Wireless configuration interface internals.
   3  *
   4  * Copyright 2006-2009  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 <linux/debugfs.h>
  14 #include <linux/rfkill.h>
  15 #include <linux/workqueue.h>
  16 #include <net/genetlink.h>
  17 #include <net/cfg80211.h>
  18 #include "reg.h"
  19
  20 struct cfg80211_registered_device {
  21         const struct cfg80211_ops *ops;
  22         struct list_head list;
  23         /* we hold this mutex during any call so that
  24          * we cannot do multiple calls at once, and also
  25          * to avoid the deregister call to proceed while
  26          * any call is in progress */
  27         struct mutex mtx;
  28
  29         /* rfkill support */
  30         struct rfkill_ops rfkill_ops;
  31         struct rfkill *rfkill;
  32         struct work_struct rfkill_sync;
  33
  34         /* ISO / IEC 3166 alpha2 for which this device is receiving
  35          * country IEs on, this can help disregard country IEs from APs
  36          * on the same alpha2 quickly. The alpha2 may differ from
  37          * cfg80211_regdomain's alpha2 when an intersection has occurred.
  38          * If the AP is reconfigured this can also be used to tell us if
  39          * the country on the country IE changed. */
  40         char country_ie_alpha2[2];
  41
  42         /* If a Country IE has been received this tells us the environment
  43          * which its telling us its in. This defaults to ENVIRON_ANY */
  44         enum environment_cap env;
  45
  46         /* wiphy index, internal only */
  47         int wiphy_idx;
  48
  49         /* associate netdev list */
  50         struct mutex devlist_mtx;
  51         struct list_head netdev_list;
  52
  53         /* BSSes/scanning */
  54         spinlock_t bss_lock;
  55         struct list_head bss_list;
  56         struct rb_root bss_tree;
  57         u32 bss_generation;
  58         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
  59         unsigned long suspend_at;
  60
  61 #ifdef CONFIG_CFG80211_DEBUGFS
  62         /* Debugfs entries */
  63         struct wiphy_debugfsdentries {
  64                 struct dentry *rts_threshold;
  65                 struct dentry *fragmentation_threshold;
  66                 struct dentry *short_retry_limit;
  67                 struct dentry *long_retry_limit;
  68                 struct dentry *ht40allow_map;
  69         } debugfs;
  70 #endif
  71
  72         /* must be last because of the way we do wiphy_priv(),
  73          * and it should at least be aligned to NETDEV_ALIGN */
  74         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
  75 };
  76
  77 static inline
  78 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  79 {
  80         BUG_ON(!wiphy);
  81         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  82 }
  83
  84 /* Note 0 is valid, hence phy0 */
  85 static inline
  86 bool wiphy_idx_valid(int wiphy_idx)
  87 {
  88         return (wiphy_idx >= 0);
  89 }
  90
  91 extern struct mutex cfg80211_mutex;
  92 extern struct list_head cfg80211_drv_list;
  93
  94 #define assert_cfg80211_lock() WARN_ON(!mutex_is_locked(&cfg80211_mutex))
  95
  96 /*
  97  * You can use this to mark a wiphy_idx as not having an associated wiphy.
  98  * It guarantees cfg80211_drv_by_wiphy_idx(wiphy_idx) will return NULL
  99  */
 100 #define WIPHY_IDX_STALE -1
 101
 102 struct cfg80211_internal_bss {
 103         struct list_head list;
 104         struct rb_node rbn;
 105         unsigned long ts;
 106         struct kref ref;
 107         bool hold, ies_allocated;
 108
 109         /* must be last because of priv member */
 110         struct cfg80211_bss pub;
 111 };
 112
 113 struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx);
 114 int get_wiphy_idx(struct wiphy *wiphy);
 115
 116 struct cfg80211_registered_device *
 117 __cfg80211_drv_from_info(struct genl_info *info);
 118
 119 /*
 120  * This function returns a pointer to the driver
 121  * that the genl_info item that is passed refers to.
 122  * If successful, it returns non-NULL and also locks
 123  * the driver's mutex!
 124  *
 125  * This means that you need to call cfg80211_put_dev()
 126  * before being allowed to acquire &cfg80211_mutex!
 127  *
 128  * This is necessary because we need to lock the global
 129  * mutex to get an item off the list safely, and then
 130  * we lock the drv mutex so it doesn't go away under us.
 131  *
 132  * We don't want to keep cfg80211_mutex locked
 133  * for all the time in order to allow requests on
 134  * other interfaces to go through at the same time.
 135  *
 136  * The result of this can be a PTR_ERR and hence must
 137  * be checked with IS_ERR() for errors.
 138  */
 139 extern struct cfg80211_registered_device *
 140 cfg80211_get_dev_from_info(struct genl_info *info);
 141
 142 /* requires cfg80211_drv_mutex to be held! */
 143 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 144
 145 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
 146 extern struct cfg80211_registered_device *
 147 cfg80211_get_dev_from_ifindex(int ifindex);
 148
 149 extern void cfg80211_put_dev(struct cfg80211_registered_device *drv);
 150
 151 /* free object */
 152 extern void cfg80211_dev_free(struct cfg80211_registered_device *drv);
 153
 154 extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
 155                                char *newname);
 156
 157 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 158 void wiphy_update_regulatory(struct wiphy *wiphy,
 159                              enum nl80211_reg_initiator setby);
 160
 161 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 162 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 163                       unsigned long age_secs);
 164
 165 /* IBSS */
 166 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 167                        struct net_device *dev,
 168                        struct cfg80211_ibss_params *params);
 169 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 170 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 171                         struct net_device *dev, bool nowext);
 172
 173 /* internal helpers */
 174 int cfg80211_validate_key_settings(struct key_params *params, int key_idx,
 175                                    const u8 *mac_addr);
 176
 177 #endif /* __NET_WIRELESS_CORE_H */