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_NL80211_TESTMODE
  62         struct genl_info *testmode_info;
  63 #endif
  64
  65         struct work_struct conn_work;
  66
  67 #ifdef CONFIG_CFG80211_DEBUGFS
  68         /* Debugfs entries */
  69         struct wiphy_debugfsdentries {
  70                 struct dentry *rts_threshold;
  71                 struct dentry *fragmentation_threshold;
  72                 struct dentry *short_retry_limit;
  73                 struct dentry *long_retry_limit;
  74                 struct dentry *ht40allow_map;
  75         } debugfs;
  76 #endif
  77
  78         /* must be last because of the way we do wiphy_priv(),
  79          * and it should at least be aligned to NETDEV_ALIGN */
  80         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
  81 };
  82
  83 static inline
  84 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  85 {
  86         BUG_ON(!wiphy);
  87         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  88 }
  89
  90 /* Note 0 is valid, hence phy0 */
  91 static inline
  92 bool wiphy_idx_valid(int wiphy_idx)
  93 {
  94         return (wiphy_idx >= 0);
  95 }
  96
  97 extern struct mutex cfg80211_mutex;
  98 extern struct list_head cfg80211_drv_list;
  99
 100 #define assert_cfg80211_lock() WARN_ON(!mutex_is_locked(&cfg80211_mutex))
 101
 102 /*
 103  * You can use this to mark a wiphy_idx as not having an associated wiphy.
 104  * It guarantees cfg80211_drv_by_wiphy_idx(wiphy_idx) will return NULL
 105  */
 106 #define WIPHY_IDX_STALE -1
 107
 108 struct cfg80211_internal_bss {
 109         struct list_head list;
 110         struct rb_node rbn;
 111         unsigned long ts;
 112         struct kref ref;
 113         atomic_t hold;
 114         bool ies_allocated;
 115
 116         /* must be last because of priv member */
 117         struct cfg80211_bss pub;
 118 };
 119
 120 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
 121 {
 122         return container_of(pub, struct cfg80211_internal_bss, pub);
 123 }
 124
 125 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 126 {
 127         atomic_inc(&bss->hold);
 128 }
 129
 130 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 131 {
 132         int r = atomic_dec_return(&bss->hold);
 133         WARN_ON(r < 0);
 134 }
 135
 136
 137 struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx);
 138 int get_wiphy_idx(struct wiphy *wiphy);
 139
 140 struct cfg80211_registered_device *
 141 __cfg80211_drv_from_info(struct genl_info *info);
 142
 143 /*
 144  * This function returns a pointer to the driver
 145  * that the genl_info item that is passed refers to.
 146  * If successful, it returns non-NULL and also locks
 147  * the driver's mutex!
 148  *
 149  * This means that you need to call cfg80211_put_dev()
 150  * before being allowed to acquire &cfg80211_mutex!
 151  *
 152  * This is necessary because we need to lock the global
 153  * mutex to get an item off the list safely, and then
 154  * we lock the drv mutex so it doesn't go away under us.
 155  *
 156  * We don't want to keep cfg80211_mutex locked
 157  * for all the time in order to allow requests on
 158  * other interfaces to go through at the same time.
 159  *
 160  * The result of this can be a PTR_ERR and hence must
 161  * be checked with IS_ERR() for errors.
 162  */
 163 extern struct cfg80211_registered_device *
 164 cfg80211_get_dev_from_info(struct genl_info *info);
 165
 166 /* requires cfg80211_drv_mutex to be held! */
 167 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 168
 169 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
 170 extern struct cfg80211_registered_device *
 171 cfg80211_get_dev_from_ifindex(int ifindex);
 172
 173 extern void cfg80211_put_dev(struct cfg80211_registered_device *drv);
 174
 175 /* free object */
 176 extern void cfg80211_dev_free(struct cfg80211_registered_device *drv);
 177
 178 extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
 179                                char *newname);
 180
 181 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 182 void wiphy_update_regulatory(struct wiphy *wiphy,
 183                              enum nl80211_reg_initiator setby);
 184
 185 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 186 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 187                       unsigned long age_secs);
 188
 189 /* IBSS */
 190 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 191                        struct net_device *dev,
 192                        struct cfg80211_ibss_params *params);
 193 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 194 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 195                         struct net_device *dev, bool nowext);
 196
 197 /* MLME */
 198 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 199                        struct net_device *dev, struct ieee80211_channel *chan,
 200                        enum nl80211_auth_type auth_type, const u8 *bssid,
 201                        const u8 *ssid, int ssid_len,
 202                        const u8 *ie, int ie_len);
 203 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 204                         struct net_device *dev, struct ieee80211_channel *chan,
 205                         const u8 *bssid, const u8 *prev_bssid,
 206                         const u8 *ssid, int ssid_len,
 207                         const u8 *ie, int ie_len, bool use_mfp,
 208                         struct cfg80211_crypto_settings *crypt);
 209 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 210                          struct net_device *dev, const u8 *bssid,
 211                          const u8 *ie, int ie_len, u16 reason);
 212 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 213                            struct net_device *dev, const u8 *bssid,
 214                            const u8 *ie, int ie_len, u16 reason);
 215 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 216                         struct net_device *dev);
 217
 218 /* SME */
 219 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 220                      struct net_device *dev,
 221                      struct cfg80211_connect_params *connect);
 222 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 223                         struct net_device *dev, u16 reason,
 224                         bool wextev);
 225
 226 void cfg80211_conn_work(struct work_struct *work);
 227
 228 /* internal helpers */
 229 int cfg80211_validate_key_settings(struct key_params *params, int key_idx,
 230                                    const u8 *mac_addr);
 231 void __cfg80211_disconnected(struct net_device *dev, gfp_t gfp, u8 *ie,
 232                              size_t ie_len, u16 reason, bool from_ap);
 233 void cfg80211_sme_scan_done(struct net_device *dev);
 234 void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
 235 void cfg80211_sme_disassoc(struct net_device *dev, int idx);
 236
 237 #endif /* __NET_WIRELESS_CORE_H */