net/wireless/core.h

   1 /*
   2  * Wireless configuration interface internals.
   3  *
   4  * Copyright 2006-2010  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         /* protected by devlist_mtx or RCU */
  52         struct list_head netdev_list;
  53         int devlist_generation;
  54         int opencount; /* also protected by devlist_mtx */
  55         wait_queue_head_t dev_wait;
  56
  57         /* BSSes/scanning */
  58         spinlock_t bss_lock;
  59         struct list_head bss_list;
  60         struct rb_root bss_tree;
  61         u32 bss_generation;
  62         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
  63         unsigned long suspend_at;
  64         struct work_struct scan_done_wk;
  65
  66 #ifdef CONFIG_NL80211_TESTMODE
  67         struct genl_info *testmode_info;
  68 #endif
  69
  70         struct work_struct conn_work;
  71         struct work_struct event_work;
  72
  73         /* current channel */
  74         struct ieee80211_channel *channel;
  75
  76         /* must be last because of the way we do wiphy_priv(),
  77          * and it should at least be aligned to NETDEV_ALIGN */
  78         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
  79 };
  80
  81 static inline
  82 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  83 {
  84         BUG_ON(!wiphy);
  85         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  86 }
  87
  88 /* Note 0 is valid, hence phy0 */
  89 static inline
  90 bool wiphy_idx_valid(int wiphy_idx)
  91 {
  92         return (wiphy_idx >= 0);
  93 }
  94
  95
  96 extern struct workqueue_struct *cfg80211_wq;
  97 extern struct mutex cfg80211_mutex;
  98 extern struct list_head cfg80211_rdev_list;
  99 extern int cfg80211_rdev_list_generation;
 100
 101 #define assert_cfg80211_lock() WARN_ON(!mutex_is_locked(&cfg80211_mutex))
 102
 103 /*
 104  * You can use this to mark a wiphy_idx as not having an associated wiphy.
 105  * It guarantees cfg80211_rdev_by_wiphy_idx(wiphy_idx) will return NULL
 106  */
 107 #define WIPHY_IDX_STALE -1
 108
 109 struct cfg80211_internal_bss {
 110         struct list_head list;
 111         struct rb_node rbn;
 112         unsigned long ts;
 113         struct kref ref;
 114         atomic_t hold;
 115         bool beacon_ies_allocated;
 116         bool proberesp_ies_allocated;
 117
 118         /* must be last because of priv member */
 119         struct cfg80211_bss pub;
 120 };
 121
 122 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
 123 {
 124         return container_of(pub, struct cfg80211_internal_bss, pub);
 125 }
 126
 127 static inline void cfg80211_ref_bss(struct cfg80211_internal_bss *bss)
 128 {
 129         kref_get(&bss->ref);
 130 }
 131
 132 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 133 {
 134         atomic_inc(&bss->hold);
 135 }
 136
 137 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 138 {
 139         int r = atomic_dec_return(&bss->hold);
 140         WARN_ON(r < 0);
 141 }
 142
 143
 144 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
 145 int get_wiphy_idx(struct wiphy *wiphy);
 146
 147 struct cfg80211_registered_device *
 148 __cfg80211_rdev_from_info(struct genl_info *info);
 149
 150 /*
 151  * This function returns a pointer to the driver
 152  * that the genl_info item that is passed refers to.
 153  * If successful, it returns non-NULL and also locks
 154  * the driver's mutex!
 155  *
 156  * This means that you need to call cfg80211_unlock_rdev()
 157  * before being allowed to acquire &cfg80211_mutex!
 158  *
 159  * This is necessary because we need to lock the global
 160  * mutex to get an item off the list safely, and then
 161  * we lock the rdev mutex so it doesn't go away under us.
 162  *
 163  * We don't want to keep cfg80211_mutex locked
 164  * for all the time in order to allow requests on
 165  * other interfaces to go through at the same time.
 166  *
 167  * The result of this can be a PTR_ERR and hence must
 168  * be checked with IS_ERR() for errors.
 169  */
 170 extern struct cfg80211_registered_device *
 171 cfg80211_get_dev_from_info(struct genl_info *info);
 172
 173 /* requires cfg80211_rdev_mutex to be held! */
 174 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 175
 176 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
 177 extern struct cfg80211_registered_device *
 178 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex);
 179
 180 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 181                           struct net *net);
 182
 183 static inline void cfg80211_lock_rdev(struct cfg80211_registered_device *rdev)
 184 {
 185         mutex_lock(&rdev->mtx);
 186 }
 187
 188 static inline void cfg80211_unlock_rdev(struct cfg80211_registered_device *rdev)
 189 {
 190         BUG_ON(IS_ERR(rdev) || !rdev);
 191         mutex_unlock(&rdev->mtx);
 192 }
 193
 194 static inline void wdev_lock(struct wireless_dev *wdev)
 195         __acquires(wdev)
 196 {
 197         mutex_lock(&wdev->mtx);
 198         __acquire(wdev->mtx);
 199 }
 200
 201 static inline void wdev_unlock(struct wireless_dev *wdev)
 202         __releases(wdev)
 203 {
 204         __release(wdev->mtx);
 205         mutex_unlock(&wdev->mtx);
 206 }
 207
 208 #define ASSERT_RDEV_LOCK(rdev) WARN_ON(!mutex_is_locked(&(rdev)->mtx));
 209 #define ASSERT_WDEV_LOCK(wdev) WARN_ON(!mutex_is_locked(&(wdev)->mtx));
 210
 211 enum cfg80211_event_type {
 212         EVENT_CONNECT_RESULT,
 213         EVENT_ROAMED,
 214         EVENT_DISCONNECTED,
 215         EVENT_IBSS_JOINED,
 216 };
 217
 218 struct cfg80211_event {
 219         struct list_head list;
 220         enum cfg80211_event_type type;
 221
 222         union {
 223                 struct {
 224                         u8 bssid[ETH_ALEN];
 225                         const u8 *req_ie;
 226                         const u8 *resp_ie;
 227                         size_t req_ie_len;
 228                         size_t resp_ie_len;
 229                         u16 status;
 230                 } cr;
 231                 struct {
 232                         u8 bssid[ETH_ALEN];
 233                         const u8 *req_ie;
 234                         const u8 *resp_ie;
 235                         size_t req_ie_len;
 236                         size_t resp_ie_len;
 237                 } rm;
 238                 struct {
 239                         const u8 *ie;
 240                         size_t ie_len;
 241                         u16 reason;
 242                 } dc;
 243                 struct {
 244                         u8 bssid[ETH_ALEN];
 245                 } ij;
 246         };
 247 };
 248
 249 struct cfg80211_cached_keys {
 250         struct key_params params[6];
 251         u8 data[6][WLAN_MAX_KEY_LEN];
 252         int def, defmgmt;
 253 };
 254
 255
 256 /* free object */
 257 extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 258
 259 extern int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 260                                char *newname);
 261
 262 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 263 void wiphy_update_regulatory(struct wiphy *wiphy,
 264                              enum nl80211_reg_initiator setby);
 265
 266 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 267 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 268                       unsigned long age_secs);
 269
 270 /* IBSS */
 271 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 272                          struct net_device *dev,
 273                          struct cfg80211_ibss_params *params,
 274                          struct cfg80211_cached_keys *connkeys);
 275 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 276                        struct net_device *dev,
 277                        struct cfg80211_ibss_params *params,
 278                        struct cfg80211_cached_keys *connkeys);
 279 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 280 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 281                           struct net_device *dev, bool nowext);
 282 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 283                         struct net_device *dev, bool nowext);
 284 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid);
 285 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 286                             struct wireless_dev *wdev);
 287
 288 /* MLME */
 289 int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 290                          struct net_device *dev,
 291                          struct ieee80211_channel *chan,
 292                          enum nl80211_auth_type auth_type,
 293                          const u8 *bssid,
 294                          const u8 *ssid, int ssid_len,
 295                          const u8 *ie, int ie_len,
 296                          const u8 *key, int key_len, int key_idx);
 297 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 298                        struct net_device *dev, struct ieee80211_channel *chan,
 299                        enum nl80211_auth_type auth_type, const u8 *bssid,
 300                        const u8 *ssid, int ssid_len,
 301                        const u8 *ie, int ie_len,
 302                        const u8 *key, int key_len, int key_idx);
 303 int __cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 304                           struct net_device *dev,
 305                           struct ieee80211_channel *chan,
 306                           const u8 *bssid, const u8 *prev_bssid,
 307                           const u8 *ssid, int ssid_len,
 308                           const u8 *ie, int ie_len, bool use_mfp,
 309                           struct cfg80211_crypto_settings *crypt);
 310 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 311                         struct net_device *dev, struct ieee80211_channel *chan,
 312                         const u8 *bssid, const u8 *prev_bssid,
 313                         const u8 *ssid, int ssid_len,
 314                         const u8 *ie, int ie_len, bool use_mfp,
 315                         struct cfg80211_crypto_settings *crypt);
 316 int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 317                            struct net_device *dev, const u8 *bssid,
 318                            const u8 *ie, int ie_len, u16 reason);
 319 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 320                          struct net_device *dev, const u8 *bssid,
 321                          const u8 *ie, int ie_len, u16 reason);
 322 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 323                            struct net_device *dev, const u8 *bssid,
 324                            const u8 *ie, int ie_len, u16 reason);
 325 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 326                         struct net_device *dev);
 327 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 328                                const u8 *req_ie, size_t req_ie_len,
 329                                const u8 *resp_ie, size_t resp_ie_len,
 330                                u16 status, bool wextev,
 331                                struct cfg80211_bss *bss);
 332 int cfg80211_mlme_register_action(struct wireless_dev *wdev, u32 snd_pid,
 333                                   const u8 *match_data, int match_len);
 334 void cfg80211_mlme_unregister_actions(struct wireless_dev *wdev, u32 nlpid);
 335 void cfg80211_mlme_purge_actions(struct wireless_dev *wdev);
 336 int cfg80211_mlme_action(struct cfg80211_registered_device *rdev,
 337                          struct net_device *dev,
 338                          struct ieee80211_channel *chan,
 339                          enum nl80211_channel_type channel_type,
 340                          const u8 *buf, size_t len, u64 *cookie);
 341
 342 /* SME */
 343 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 344                        struct net_device *dev,
 345                        struct cfg80211_connect_params *connect,
 346                        struct cfg80211_cached_keys *connkeys,
 347                        const u8 *prev_bssid);
 348 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 349                      struct net_device *dev,
 350                      struct cfg80211_connect_params *connect,
 351                      struct cfg80211_cached_keys *connkeys);
 352 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 353                           struct net_device *dev, u16 reason,
 354                           bool wextev);
 355 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 356                         struct net_device *dev, u16 reason,
 357                         bool wextev);
 358 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
 359                        const u8 *req_ie, size_t req_ie_len,
 360                        const u8 *resp_ie, size_t resp_ie_len);
 361 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 362                               struct wireless_dev *wdev);
 363
 364 void cfg80211_conn_work(struct work_struct *work);
 365 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev);
 366 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev);
 367
 368 /* internal helpers */
 369 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 370                                    struct key_params *params, int key_idx,
 371                                    const u8 *mac_addr);
 372 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 373                              size_t ie_len, u16 reason, bool from_ap);
 374 void cfg80211_sme_scan_done(struct net_device *dev);
 375 void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
 376 void cfg80211_sme_disassoc(struct net_device *dev, int idx);
 377 void __cfg80211_scan_done(struct work_struct *wk);
 378 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak);
 379 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
 380 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 381                           struct net_device *dev, enum nl80211_iftype ntype,
 382                           u32 *flags, struct vif_params *params);
 383 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 384
 385 struct ieee80211_channel *
 386 rdev_fixed_channel(struct cfg80211_registered_device *rdev,
 387                    struct wireless_dev *for_wdev);
 388 struct ieee80211_channel *
 389 rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
 390                   int freq, enum nl80211_channel_type channel_type);
 391 int rdev_set_freq(struct cfg80211_registered_device *rdev,
 392                   struct wireless_dev *for_wdev,
 393                   int freq, enum nl80211_channel_type channel_type);
 394
 395 u16 cfg80211_calculate_bitrate(struct rate_info *rate);
 396
 397 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 398 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
 399 #else
 400 /*
 401  * Trick to enable using it as a condition,
 402  * and also not give a warning when it's
 403  * not used that way.
 404  */
 405 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
 406 #endif
 407
 408 #endif /* __NET_WIRELESS_CORE_H */