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 <linux/rtnetlink.h>
  17 #include <net/genetlink.h>
  18 #include <net/cfg80211.h>
  19 #include "reg.h"
  20
  21 struct cfg80211_registered_device {
  22         const struct cfg80211_ops *ops;
  23         struct list_head list;
  24         /* we hold this mutex during any call so that
  25          * we cannot do multiple calls at once, and also
  26          * to avoid the deregister call to proceed while
  27          * any call is in progress */
  28         struct mutex mtx;
  29
  30         /* rfkill support */
  31         struct rfkill_ops rfkill_ops;
  32         struct rfkill *rfkill;
  33         struct work_struct rfkill_sync;
  34
  35         /* ISO / IEC 3166 alpha2 for which this device is receiving
  36          * country IEs on, this can help disregard country IEs from APs
  37          * on the same alpha2 quickly. The alpha2 may differ from
  38          * cfg80211_regdomain's alpha2 when an intersection has occurred.
  39          * If the AP is reconfigured this can also be used to tell us if
  40          * the country on the country IE changed. */
  41         char country_ie_alpha2[2];
  42
  43         /* If a Country IE has been received this tells us the environment
  44          * which its telling us its in. This defaults to ENVIRON_ANY */
  45         enum environment_cap env;
  46
  47         /* wiphy index, internal only */
  48         int wiphy_idx;
  49
  50         /* associated wireless interfaces */
  51         struct mutex devlist_mtx;
  52         /* protected by devlist_mtx or RCU */
  53         struct list_head wdev_list;
  54         int devlist_generation, wdev_id;
  55         int opencount; /* also protected by devlist_mtx */
  56         wait_queue_head_t dev_wait;
  57
  58         u32 ap_beacons_nlpid;
  59
  60         /* protected by RTNL only */
  61         int num_running_ifaces;
  62         int num_running_monitor_ifaces;
  63
  64         /* BSSes/scanning */
  65         spinlock_t bss_lock;
  66         struct list_head bss_list;
  67         struct rb_root bss_tree;
  68         u32 bss_generation;
  69         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
  70         struct cfg80211_sched_scan_request *sched_scan_req;
  71         unsigned long suspend_at;
  72         struct work_struct scan_done_wk;
  73         struct work_struct sched_scan_results_wk;
  74
  75         struct mutex sched_scan_mtx;
  76
  77 #ifdef CONFIG_NL80211_TESTMODE
  78         struct genl_info *testmode_info;
  79 #endif
  80
  81         struct work_struct conn_work;
  82         struct work_struct event_work;
  83
  84         struct cfg80211_wowlan *wowlan;
  85
  86         /* must be last because of the way we do wiphy_priv(),
  87          * and it should at least be aligned to NETDEV_ALIGN */
  88         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
  89 };
  90
  91 static inline
  92 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  93 {
  94         BUG_ON(!wiphy);
  95         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  96 }
  97
  98 /* Note 0 is valid, hence phy0 */
  99 static inline
 100 bool wiphy_idx_valid(int wiphy_idx)
 101 {
 102         return wiphy_idx >= 0;
 103 }
 104
 105 static inline void
 106 cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
 107 {
 108         int i;
 109
 110         if (!rdev->wowlan)
 111                 return;
 112         for (i = 0; i < rdev->wowlan->n_patterns; i++)
 113                 kfree(rdev->wowlan->patterns[i].mask);
 114         kfree(rdev->wowlan->patterns);
 115         kfree(rdev->wowlan);
 116 }
 117
 118 extern struct workqueue_struct *cfg80211_wq;
 119 extern struct mutex cfg80211_mutex;
 120 extern struct list_head cfg80211_rdev_list;
 121 extern int cfg80211_rdev_list_generation;
 122
 123 static inline void assert_cfg80211_lock(void)
 124 {
 125         lockdep_assert_held(&cfg80211_mutex);
 126 }
 127
 128 /*
 129  * You can use this to mark a wiphy_idx as not having an associated wiphy.
 130  * It guarantees cfg80211_rdev_by_wiphy_idx(wiphy_idx) will return NULL
 131  */
 132 #define WIPHY_IDX_STALE -1
 133
 134 struct cfg80211_internal_bss {
 135         struct list_head list;
 136         struct rb_node rbn;
 137         unsigned long ts;
 138         struct kref ref;
 139         atomic_t hold;
 140         bool beacon_ies_allocated;
 141         bool proberesp_ies_allocated;
 142
 143         /* must be last because of priv member */
 144         struct cfg80211_bss pub;
 145 };
 146
 147 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
 148 {
 149         return container_of(pub, struct cfg80211_internal_bss, pub);
 150 }
 151
 152 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 153 {
 154         atomic_inc(&bss->hold);
 155 }
 156
 157 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 158 {
 159         int r = atomic_dec_return(&bss->hold);
 160         WARN_ON(r < 0);
 161 }
 162
 163
 164 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
 165 int get_wiphy_idx(struct wiphy *wiphy);
 166
 167 /* requires cfg80211_rdev_mutex to be held! */
 168 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 169
 170 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
 171 extern struct cfg80211_registered_device *
 172 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex);
 173
 174 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 175                           struct net *net);
 176
 177 static inline void cfg80211_lock_rdev(struct cfg80211_registered_device *rdev)
 178 {
 179         mutex_lock(&rdev->mtx);
 180 }
 181
 182 static inline void cfg80211_unlock_rdev(struct cfg80211_registered_device *rdev)
 183 {
 184         BUG_ON(IS_ERR(rdev) || !rdev);
 185         mutex_unlock(&rdev->mtx);
 186 }
 187
 188 static inline void wdev_lock(struct wireless_dev *wdev)
 189         __acquires(wdev)
 190 {
 191         mutex_lock(&wdev->mtx);
 192         __acquire(wdev->mtx);
 193 }
 194
 195 static inline void wdev_unlock(struct wireless_dev *wdev)
 196         __releases(wdev)
 197 {
 198         __release(wdev->mtx);
 199         mutex_unlock(&wdev->mtx);
 200 }
 201
 202 #define ASSERT_RDEV_LOCK(rdev) lockdep_assert_held(&(rdev)->mtx)
 203 #define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
 204
 205 static inline bool cfg80211_has_monitors_only(struct cfg80211_registered_device *rdev)
 206 {
 207         ASSERT_RTNL();
 208
 209         return rdev->num_running_ifaces == rdev->num_running_monitor_ifaces &&
 210                rdev->num_running_ifaces > 0;
 211 }
 212
 213 enum cfg80211_event_type {
 214         EVENT_CONNECT_RESULT,
 215         EVENT_ROAMED,
 216         EVENT_DISCONNECTED,
 217         EVENT_IBSS_JOINED,
 218 };
 219
 220 struct cfg80211_event {
 221         struct list_head list;
 222         enum cfg80211_event_type type;
 223
 224         union {
 225                 struct {
 226                         u8 bssid[ETH_ALEN];
 227                         const u8 *req_ie;
 228                         const u8 *resp_ie;
 229                         size_t req_ie_len;
 230                         size_t resp_ie_len;
 231                         u16 status;
 232                 } cr;
 233                 struct {
 234                         const u8 *req_ie;
 235                         const u8 *resp_ie;
 236                         size_t req_ie_len;
 237                         size_t resp_ie_len;
 238                         struct cfg80211_bss *bss;
 239                 } rm;
 240                 struct {
 241                         const u8 *ie;
 242                         size_t ie_len;
 243                         u16 reason;
 244                 } dc;
 245                 struct {
 246                         u8 bssid[ETH_ALEN];
 247                 } ij;
 248         };
 249 };
 250
 251 struct cfg80211_cached_keys {
 252         struct key_params params[6];
 253         u8 data[6][WLAN_MAX_KEY_LEN];
 254         int def, defmgmt;
 255 };
 256
 257 enum cfg80211_chan_mode {
 258         CHAN_MODE_UNDEFINED,
 259         CHAN_MODE_SHARED,
 260         CHAN_MODE_EXCLUSIVE,
 261 };
 262
 263
 264 /* free object */
 265 extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 266
 267 extern int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 268                                char *newname);
 269
 270 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 271
 272 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 273 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 274                       unsigned long age_secs);
 275
 276 /* IBSS */
 277 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 278                          struct net_device *dev,
 279                          struct cfg80211_ibss_params *params,
 280                          struct cfg80211_cached_keys *connkeys);
 281 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 282                        struct net_device *dev,
 283                        struct cfg80211_ibss_params *params,
 284                        struct cfg80211_cached_keys *connkeys);
 285 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 286 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 287                           struct net_device *dev, bool nowext);
 288 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 289                         struct net_device *dev, bool nowext);
 290 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid);
 291 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 292                             struct wireless_dev *wdev);
 293
 294 /* mesh */
 295 extern const struct mesh_config default_mesh_config;
 296 extern const struct mesh_setup default_mesh_setup;
 297 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 298                          struct net_device *dev,
 299                          struct mesh_setup *setup,
 300                          const struct mesh_config *conf);
 301 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 302                        struct net_device *dev,
 303                        struct mesh_setup *setup,
 304                        const struct mesh_config *conf);
 305 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 306                         struct net_device *dev);
 307 int cfg80211_set_mesh_freq(struct cfg80211_registered_device *rdev,
 308                            struct wireless_dev *wdev, int freq,
 309                            enum nl80211_channel_type channel_type);
 310
 311 /* AP */
 312 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 313                      struct net_device *dev);
 314
 315 /* MLME */
 316 int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 317                          struct net_device *dev,
 318                          struct ieee80211_channel *chan,
 319                          enum nl80211_auth_type auth_type,
 320                          const u8 *bssid,
 321                          const u8 *ssid, int ssid_len,
 322                          const u8 *ie, int ie_len,
 323                          const u8 *key, int key_len, int key_idx);
 324 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 325                        struct net_device *dev, struct ieee80211_channel *chan,
 326                        enum nl80211_auth_type auth_type, const u8 *bssid,
 327                        const u8 *ssid, int ssid_len,
 328                        const u8 *ie, int ie_len,
 329                        const u8 *key, int key_len, int key_idx);
 330 int __cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 331                           struct net_device *dev,
 332                           struct ieee80211_channel *chan,
 333                           const u8 *bssid, const u8 *prev_bssid,
 334                           const u8 *ssid, int ssid_len,
 335                           const u8 *ie, int ie_len, bool use_mfp,
 336                           struct cfg80211_crypto_settings *crypt,
 337                           u32 assoc_flags, struct ieee80211_ht_cap *ht_capa,
 338                           struct ieee80211_ht_cap *ht_capa_mask);
 339 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 340                         struct net_device *dev, struct ieee80211_channel *chan,
 341                         const u8 *bssid, const u8 *prev_bssid,
 342                         const u8 *ssid, int ssid_len,
 343                         const u8 *ie, int ie_len, bool use_mfp,
 344                         struct cfg80211_crypto_settings *crypt,
 345                         u32 assoc_flags, struct ieee80211_ht_cap *ht_capa,
 346                         struct ieee80211_ht_cap *ht_capa_mask);
 347 int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 348                            struct net_device *dev, const u8 *bssid,
 349                            const u8 *ie, int ie_len, u16 reason,
 350                            bool local_state_change);
 351 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 352                          struct net_device *dev, const u8 *bssid,
 353                          const u8 *ie, int ie_len, u16 reason,
 354                          bool local_state_change);
 355 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 356                            struct net_device *dev, const u8 *bssid,
 357                            const u8 *ie, int ie_len, u16 reason,
 358                            bool local_state_change);
 359 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 360                         struct net_device *dev);
 361 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 362                                const u8 *req_ie, size_t req_ie_len,
 363                                const u8 *resp_ie, size_t resp_ie_len,
 364                                u16 status, bool wextev,
 365                                struct cfg80211_bss *bss);
 366 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
 367                                 u16 frame_type, const u8 *match_data,
 368                                 int match_len);
 369 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
 370 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
 371 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 372                           struct wireless_dev *wdev,
 373                           struct ieee80211_channel *chan, bool offchan,
 374                           enum nl80211_channel_type channel_type,
 375                           bool channel_type_valid, unsigned int wait,
 376                           const u8 *buf, size_t len, bool no_cck,
 377                           bool dont_wait_for_ack, u64 *cookie);
 378 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 379                                const struct ieee80211_ht_cap *ht_capa_mask);
 380
 381 /* SME */
 382 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 383                        struct net_device *dev,
 384                        struct cfg80211_connect_params *connect,
 385                        struct cfg80211_cached_keys *connkeys,
 386                        const u8 *prev_bssid);
 387 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 388                      struct net_device *dev,
 389                      struct cfg80211_connect_params *connect,
 390                      struct cfg80211_cached_keys *connkeys);
 391 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 392                           struct net_device *dev, u16 reason,
 393                           bool wextev);
 394 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 395                         struct net_device *dev, u16 reason,
 396                         bool wextev);
 397 void __cfg80211_roamed(struct wireless_dev *wdev,
 398                        struct cfg80211_bss *bss,
 399                        const u8 *req_ie, size_t req_ie_len,
 400                        const u8 *resp_ie, size_t resp_ie_len);
 401 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 402                               struct wireless_dev *wdev);
 403
 404 void cfg80211_conn_work(struct work_struct *work);
 405 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev);
 406 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev);
 407
 408 /* internal helpers */
 409 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
 410 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 411                                    struct key_params *params, int key_idx,
 412                                    bool pairwise, const u8 *mac_addr);
 413 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 414                              size_t ie_len, u16 reason, bool from_ap);
 415 void cfg80211_sme_scan_done(struct net_device *dev);
 416 void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
 417 void cfg80211_sme_disassoc(struct net_device *dev,
 418                            struct cfg80211_internal_bss *bss);
 419 void __cfg80211_scan_done(struct work_struct *wk);
 420 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak);
 421 void __cfg80211_sched_scan_results(struct work_struct *wk);
 422 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 423                                bool driver_initiated);
 424 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
 425 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 426                           struct net_device *dev, enum nl80211_iftype ntype,
 427                           u32 *flags, struct vif_params *params);
 428 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 429
 430 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
 431                                  struct wireless_dev *wdev,
 432                                  enum nl80211_iftype iftype,
 433                                  struct ieee80211_channel *chan,
 434                                  enum cfg80211_chan_mode chanmode);
 435
 436 static inline int
 437 cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
 438                               struct wireless_dev *wdev,
 439                               enum nl80211_iftype iftype)
 440 {
 441         return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
 442                                             CHAN_MODE_UNDEFINED);
 443 }
 444
 445 static inline int
 446 cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
 447                            enum nl80211_iftype iftype)
 448 {
 449         return cfg80211_can_change_interface(rdev, NULL, iftype);
 450 }
 451
 452 static inline int
 453 cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
 454                       struct wireless_dev *wdev,
 455                       struct ieee80211_channel *chan,
 456                       enum cfg80211_chan_mode chanmode)
 457 {
 458         return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 459                                             chan, chanmode);
 460 }
 461
 462 void
 463 cfg80211_get_chan_state(struct wireless_dev *wdev,
 464                         struct ieee80211_channel **chan,
 465                         enum cfg80211_chan_mode *chanmode);
 466
 467 struct ieee80211_channel *
 468 rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
 469                   int freq, enum nl80211_channel_type channel_type);
 470 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
 471                                  int freq, enum nl80211_channel_type chantype);
 472
 473 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 474                            const u8 *rates, unsigned int n_rates,
 475                            u32 *mask);
 476
 477 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 478                                  u32 beacon_int);
 479
 480 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 481                                enum nl80211_iftype iftype, int num);
 482
 483 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
 484
 485 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 486 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
 487 #else
 488 /*
 489  * Trick to enable using it as a condition,
 490  * and also not give a warning when it's
 491  * not used that way.
 492  */
 493 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
 494 #endif
 495
 496 #endif /* __NET_WIRELESS_CORE_H */