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/rbtree.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/rfkill.h>
  14 #include <linux/workqueue.h>
  15 #include <linux/rtnetlink.h>
  16 #include <net/genetlink.h>
  17 #include <net/cfg80211.h>
  18 #include "reg.h"
  19
  20
  21 #define WIPHY_IDX_INVALID       -1
  22
  23 struct cfg80211_registered_device {
  24         const struct cfg80211_ops *ops;
  25         struct list_head list;
  26         /* we hold this mutex during any call so that
  27          * we cannot do multiple calls at once, and also
  28          * to avoid the deregister call to proceed while
  29          * any call is in progress */
  30         struct mutex mtx;
  31
  32         /* rfkill support */
  33         struct rfkill_ops rfkill_ops;
  34         struct rfkill *rfkill;
  35         struct work_struct rfkill_sync;
  36
  37         /* ISO / IEC 3166 alpha2 for which this device is receiving
  38          * country IEs on, this can help disregard country IEs from APs
  39          * on the same alpha2 quickly. The alpha2 may differ from
  40          * cfg80211_regdomain's alpha2 when an intersection has occurred.
  41          * If the AP is reconfigured this can also be used to tell us if
  42          * the country on the country IE changed. */
  43         char country_ie_alpha2[2];
  44
  45         /* If a Country IE has been received this tells us the environment
  46          * which its telling us its in. This defaults to ENVIRON_ANY */
  47         enum environment_cap env;
  48
  49         /* wiphy index, internal only */
  50         int wiphy_idx;
  51
  52         /* associated wireless interfaces */
  53         struct mutex devlist_mtx;
  54         /* protected by devlist_mtx or RCU */
  55         struct list_head wdev_list;
  56         int devlist_generation, wdev_id;
  57         int opencount; /* also protected by devlist_mtx */
  58         wait_queue_head_t dev_wait;
  59
  60         struct list_head beacon_registrations;
  61         spinlock_t beacon_registrations_lock;
  62
  63         /* protected by RTNL only */
  64         int num_running_ifaces;
  65         int num_running_monitor_ifaces;
  66
  67         /* BSSes/scanning */
  68         spinlock_t bss_lock;
  69         struct list_head bss_list;
  70         struct rb_root bss_tree;
  71         u32 bss_generation;
  72         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
  73         struct cfg80211_sched_scan_request *sched_scan_req;
  74         unsigned long suspend_at;
  75         struct work_struct scan_done_wk;
  76         struct work_struct sched_scan_results_wk;
  77
  78         struct mutex sched_scan_mtx;
  79
  80 #ifdef CONFIG_NL80211_TESTMODE
  81         struct genl_info *testmode_info;
  82 #endif
  83
  84         struct work_struct conn_work;
  85         struct work_struct event_work;
  86
  87         struct cfg80211_wowlan *wowlan;
  88
  89         /* must be last because of the way we do wiphy_priv(),
  90          * and it should at least be aligned to NETDEV_ALIGN */
  91         struct wiphy wiphy __aligned(NETDEV_ALIGN);
  92 };
  93
  94 static inline
  95 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  96 {
  97         BUG_ON(!wiphy);
  98         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  99 }
 100
 101 static inline void
 102 cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
 103 {
 104         int i;
 105
 106         if (!rdev->wowlan)
 107                 return;
 108         for (i = 0; i < rdev->wowlan->n_patterns; i++)
 109                 kfree(rdev->wowlan->patterns[i].mask);
 110         kfree(rdev->wowlan->patterns);
 111         kfree(rdev->wowlan);
 112 }
 113
 114 extern struct workqueue_struct *cfg80211_wq;
 115 extern struct mutex cfg80211_mutex;
 116 extern struct list_head cfg80211_rdev_list;
 117 extern int cfg80211_rdev_list_generation;
 118
 119 static inline void assert_cfg80211_lock(void)
 120 {
 121         lockdep_assert_held(&cfg80211_mutex);
 122 }
 123
 124 struct cfg80211_internal_bss {
 125         struct list_head list;
 126         struct list_head hidden_list;
 127         struct rb_node rbn;
 128         unsigned long ts;
 129         unsigned long refcount;
 130         atomic_t hold;
 131
 132         /* must be last because of priv member */
 133         struct cfg80211_bss pub;
 134 };
 135
 136 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
 137 {
 138         return container_of(pub, struct cfg80211_internal_bss, pub);
 139 }
 140
 141 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 142 {
 143         atomic_inc(&bss->hold);
 144 }
 145
 146 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 147 {
 148         int r = atomic_dec_return(&bss->hold);
 149         WARN_ON(r < 0);
 150 }
 151
 152
 153 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
 154 int get_wiphy_idx(struct wiphy *wiphy);
 155
 156 /* requires cfg80211_rdev_mutex to be held! */
 157 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 158
 159 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
 160 extern struct cfg80211_registered_device *
 161 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex);
 162
 163 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 164                           struct net *net);
 165
 166 static inline void cfg80211_lock_rdev(struct cfg80211_registered_device *rdev)
 167 {
 168         mutex_lock(&rdev->mtx);
 169 }
 170
 171 static inline void cfg80211_unlock_rdev(struct cfg80211_registered_device *rdev)
 172 {
 173         BUG_ON(IS_ERR(rdev) || !rdev);
 174         mutex_unlock(&rdev->mtx);
 175 }
 176
 177 static inline void wdev_lock(struct wireless_dev *wdev)
 178         __acquires(wdev)
 179 {
 180         mutex_lock(&wdev->mtx);
 181         __acquire(wdev->mtx);
 182 }
 183
 184 static inline void wdev_unlock(struct wireless_dev *wdev)
 185         __releases(wdev)
 186 {
 187         __release(wdev->mtx);
 188         mutex_unlock(&wdev->mtx);
 189 }
 190
 191 #define ASSERT_RDEV_LOCK(rdev) lockdep_assert_held(&(rdev)->mtx)
 192 #define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
 193
 194 static inline bool cfg80211_has_monitors_only(struct cfg80211_registered_device *rdev)
 195 {
 196         ASSERT_RTNL();
 197
 198         return rdev->num_running_ifaces == rdev->num_running_monitor_ifaces &&
 199                rdev->num_running_ifaces > 0;
 200 }
 201
 202 enum cfg80211_event_type {
 203         EVENT_CONNECT_RESULT,
 204         EVENT_ROAMED,
 205         EVENT_DISCONNECTED,
 206         EVENT_IBSS_JOINED,
 207 };
 208
 209 struct cfg80211_event {
 210         struct list_head list;
 211         enum cfg80211_event_type type;
 212
 213         union {
 214                 struct {
 215                         u8 bssid[ETH_ALEN];
 216                         const u8 *req_ie;
 217                         const u8 *resp_ie;
 218                         size_t req_ie_len;
 219                         size_t resp_ie_len;
 220                         u16 status;
 221                 } cr;
 222                 struct {
 223                         const u8 *req_ie;
 224                         const u8 *resp_ie;
 225                         size_t req_ie_len;
 226                         size_t resp_ie_len;
 227                         struct cfg80211_bss *bss;
 228                 } rm;
 229                 struct {
 230                         const u8 *ie;
 231                         size_t ie_len;
 232                         u16 reason;
 233                 } dc;
 234                 struct {
 235                         u8 bssid[ETH_ALEN];
 236                 } ij;
 237         };
 238 };
 239
 240 struct cfg80211_cached_keys {
 241         struct key_params params[6];
 242         u8 data[6][WLAN_MAX_KEY_LEN];
 243         int def, defmgmt;
 244 };
 245
 246 enum cfg80211_chan_mode {
 247         CHAN_MODE_UNDEFINED,
 248         CHAN_MODE_SHARED,
 249         CHAN_MODE_EXCLUSIVE,
 250 };
 251
 252 struct cfg80211_beacon_registration {
 253         struct list_head list;
 254         u32 nlportid;
 255 };
 256
 257 /* free object */
 258 extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 259
 260 extern int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 261                                char *newname);
 262
 263 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 264
 265 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 266 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 267                       unsigned long age_secs);
 268
 269 /* IBSS */
 270 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 271                          struct net_device *dev,
 272                          struct cfg80211_ibss_params *params,
 273                          struct cfg80211_cached_keys *connkeys);
 274 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 275                        struct net_device *dev,
 276                        struct cfg80211_ibss_params *params,
 277                        struct cfg80211_cached_keys *connkeys);
 278 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 279 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 280                           struct net_device *dev, bool nowext);
 281 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 282                         struct net_device *dev, bool nowext);
 283 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid);
 284 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 285                             struct wireless_dev *wdev);
 286
 287 /* mesh */
 288 extern const struct mesh_config default_mesh_config;
 289 extern const struct mesh_setup default_mesh_setup;
 290 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 291                          struct net_device *dev,
 292                          struct mesh_setup *setup,
 293                          const struct mesh_config *conf);
 294 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 295                        struct net_device *dev,
 296                        struct mesh_setup *setup,
 297                        const struct mesh_config *conf);
 298 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 299                         struct net_device *dev);
 300 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 301                               struct wireless_dev *wdev,
 302                               struct cfg80211_chan_def *chandef);
 303
 304 /* AP */
 305 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 306                      struct net_device *dev);
 307
 308 /* MLME */
 309 int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 310                          struct net_device *dev,
 311                          struct ieee80211_channel *chan,
 312                          enum nl80211_auth_type auth_type,
 313                          const u8 *bssid,
 314                          const u8 *ssid, int ssid_len,
 315                          const u8 *ie, int ie_len,
 316                          const u8 *key, int key_len, int key_idx,
 317                          const u8 *sae_data, int sae_data_len);
 318 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 319                        struct net_device *dev, struct ieee80211_channel *chan,
 320                        enum nl80211_auth_type auth_type, 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                        const u8 *sae_data, int sae_data_len);
 325 int __cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 326                           struct net_device *dev,
 327                           struct ieee80211_channel *chan,
 328                           const u8 *bssid, const u8 *prev_bssid,
 329                           const u8 *ssid, int ssid_len,
 330                           const u8 *ie, int ie_len, bool use_mfp,
 331                           struct cfg80211_crypto_settings *crypt,
 332                           u32 assoc_flags, struct ieee80211_ht_cap *ht_capa,
 333                           struct ieee80211_ht_cap *ht_capa_mask);
 334 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 335                         struct net_device *dev, struct ieee80211_channel *chan,
 336                         const u8 *bssid, const u8 *prev_bssid,
 337                         const u8 *ssid, int ssid_len,
 338                         const u8 *ie, int ie_len, bool use_mfp,
 339                         struct cfg80211_crypto_settings *crypt,
 340                         u32 assoc_flags, struct ieee80211_ht_cap *ht_capa,
 341                         struct ieee80211_ht_cap *ht_capa_mask);
 342 int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 343                            struct net_device *dev, const u8 *bssid,
 344                            const u8 *ie, int ie_len, u16 reason,
 345                            bool local_state_change);
 346 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 347                          struct net_device *dev, const u8 *bssid,
 348                          const u8 *ie, int ie_len, u16 reason,
 349                          bool local_state_change);
 350 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 351                            struct net_device *dev, const u8 *bssid,
 352                            const u8 *ie, int ie_len, u16 reason,
 353                            bool local_state_change);
 354 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 355                         struct net_device *dev);
 356 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 357                                const u8 *req_ie, size_t req_ie_len,
 358                                const u8 *resp_ie, size_t resp_ie_len,
 359                                u16 status, bool wextev,
 360                                struct cfg80211_bss *bss);
 361 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
 362                                 u16 frame_type, const u8 *match_data,
 363                                 int match_len);
 364 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
 365 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
 366 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 367                           struct wireless_dev *wdev,
 368                           struct ieee80211_channel *chan, bool offchan,
 369                           unsigned int wait, const u8 *buf, size_t len,
 370                           bool no_cck, bool dont_wait_for_ack, u64 *cookie);
 371 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 372                                const struct ieee80211_ht_cap *ht_capa_mask);
 373
 374 /* SME */
 375 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 376                        struct net_device *dev,
 377                        struct cfg80211_connect_params *connect,
 378                        struct cfg80211_cached_keys *connkeys,
 379                        const u8 *prev_bssid);
 380 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 381                      struct net_device *dev,
 382                      struct cfg80211_connect_params *connect,
 383                      struct cfg80211_cached_keys *connkeys);
 384 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 385                           struct net_device *dev, u16 reason,
 386                           bool wextev);
 387 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 388                         struct net_device *dev, u16 reason,
 389                         bool wextev);
 390 void __cfg80211_roamed(struct wireless_dev *wdev,
 391                        struct cfg80211_bss *bss,
 392                        const u8 *req_ie, size_t req_ie_len,
 393                        const u8 *resp_ie, size_t resp_ie_len);
 394 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 395                               struct wireless_dev *wdev);
 396
 397 void cfg80211_conn_work(struct work_struct *work);
 398 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev);
 399 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev);
 400
 401 /* internal helpers */
 402 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
 403 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 404                                    struct key_params *params, int key_idx,
 405                                    bool pairwise, const u8 *mac_addr);
 406 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 407                              size_t ie_len, u16 reason, bool from_ap);
 408 void cfg80211_sme_scan_done(struct net_device *dev);
 409 void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
 410 void cfg80211_sme_disassoc(struct net_device *dev,
 411                            struct cfg80211_internal_bss *bss);
 412 void __cfg80211_scan_done(struct work_struct *wk);
 413 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak);
 414 void __cfg80211_sched_scan_results(struct work_struct *wk);
 415 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 416                                bool driver_initiated);
 417 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
 418 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 419                           struct net_device *dev, enum nl80211_iftype ntype,
 420                           u32 *flags, struct vif_params *params);
 421 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 422 void cfg80211_process_wdev_events(struct wireless_dev *wdev);
 423
 424 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
 425                                  struct wireless_dev *wdev,
 426                                  enum nl80211_iftype iftype,
 427                                  struct ieee80211_channel *chan,
 428                                  enum cfg80211_chan_mode chanmode,
 429                                  u8 radar_detect);
 430
 431 static inline int
 432 cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
 433                               struct wireless_dev *wdev,
 434                               enum nl80211_iftype iftype)
 435 {
 436         return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
 437                                             CHAN_MODE_UNDEFINED, 0);
 438 }
 439
 440 static inline int
 441 cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
 442                            enum nl80211_iftype iftype)
 443 {
 444         return cfg80211_can_change_interface(rdev, NULL, iftype);
 445 }
 446
 447 static inline int
 448 cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
 449                       struct wireless_dev *wdev,
 450                       struct ieee80211_channel *chan,
 451                       enum cfg80211_chan_mode chanmode)
 452 {
 453         return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 454                                             chan, chanmode, 0);
 455 }
 456
 457 void
 458 cfg80211_get_chan_state(struct wireless_dev *wdev,
 459                         struct ieee80211_channel **chan,
 460                         enum cfg80211_chan_mode *chanmode);
 461
 462 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
 463                                  struct cfg80211_chan_def *chandef);
 464
 465 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 466                            const u8 *rates, unsigned int n_rates,
 467                            u32 *mask);
 468
 469 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 470                                  u32 beacon_int);
 471
 472 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 473                                enum nl80211_iftype iftype, int num);
 474
 475 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
 476
 477 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 478 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
 479 #else
 480 /*
 481  * Trick to enable using it as a condition,
 482  * and also not give a warning when it's
 483  * not used that way.
 484  */
 485 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
 486 #endif
 487
 488 #endif /* __NET_WIRELESS_CORE_H */