kernel/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/list.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/rbtree.h>
  11 #include <linux/debugfs.h>
  12 #include <linux/rfkill.h>
  13 #include <linux/workqueue.h>
  14 #include <linux/rtnetlink.h>
  15 #include <net/genetlink.h>
  16 #include <net/cfg80211.h>
  17 #include "reg.h"
  18
  19
  20 #define WIPHY_IDX_INVALID       -1
  21
  22 struct cfg80211_registered_device {
  23         const struct cfg80211_ops *ops;
  24         struct list_head list;
  25
  26         /* rfkill support */
  27         struct rfkill_ops rfkill_ops;
  28         struct rfkill *rfkill;
  29         struct work_struct rfkill_sync;
  30
  31         /* ISO / IEC 3166 alpha2 for which this device is receiving
  32          * country IEs on, this can help disregard country IEs from APs
  33          * on the same alpha2 quickly. The alpha2 may differ from
  34          * cfg80211_regdomain's alpha2 when an intersection has occurred.
  35          * If the AP is reconfigured this can also be used to tell us if
  36          * the country on the country IE changed. */
  37         char country_ie_alpha2[2];
  38
  39         /*
  40          * the driver requests the regulatory core to set this regulatory
  41          * domain as the wiphy's. Only used for %REGULATORY_WIPHY_SELF_MANAGED
  42          * devices using the regulatory_set_wiphy_regd() API
  43          */
  44         const struct ieee80211_regdomain *requested_regd;
  45
  46         /* If a Country IE has been received this tells us the environment
  47          * which its telling us its in. This defaults to ENVIRON_ANY */
  48         enum environment_cap env;
  49
  50         /* wiphy index, internal only */
  51         int wiphy_idx;
  52
  53         /* associated wireless interfaces, protected by rtnl or RCU */
  54         struct list_head wdev_list;
  55         int devlist_generation, wdev_id;
  56         int opencount; /* also protected by devlist_mtx */
  57         wait_queue_head_t dev_wait;
  58
  59         struct list_head beacon_registrations;
  60         spinlock_t beacon_registrations_lock;
  61
  62         struct list_head mlme_unreg;
  63         spinlock_t mlme_unreg_lock;
  64         struct work_struct mlme_unreg_wk;
  65
  66         /* protected by RTNL only */
  67         int num_running_ifaces;
  68         int num_running_monitor_ifaces;
  69
  70         /* BSSes/scanning */
  71         spinlock_t bss_lock;
  72         struct list_head bss_list;
  73         struct rb_root bss_tree;
  74         u32 bss_generation;
  75         u32 bss_entries;
  76         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
  77         struct sk_buff *scan_msg;
  78         struct cfg80211_sched_scan_request __rcu *sched_scan_req;
  79         unsigned long suspend_at;
  80         struct work_struct scan_done_wk;
  81         struct work_struct sched_scan_results_wk;
  82
  83         struct genl_info *cur_cmd_info;
  84
  85         struct work_struct conn_work;
  86         struct work_struct event_work;
  87
  88         struct delayed_work dfs_update_channels_wk;
  89
  90         /* netlink port which started critical protocol (0 means not started) */
  91         u32 crit_proto_nlportid;
  92
  93         struct cfg80211_coalesce *coalesce;
  94
  95         spinlock_t destroy_list_lock;
  96         struct list_head destroy_list;
  97         struct work_struct destroy_work;
  98
  99         struct work_struct sched_scan_stop_wk;
 100
 101         /* must be last because of the way we do wiphy_priv(),
 102          * and it should at least be aligned to NETDEV_ALIGN */
 103         struct wiphy wiphy __aligned(NETDEV_ALIGN);
 104 };
 105
 106 static inline
 107 struct cfg80211_registered_device *wiphy_to_rdev(struct wiphy *wiphy)
 108 {
 109         BUG_ON(!wiphy);
 110         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
 111 }
 112
 113 static inline void
 114 cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
 115 {
 116 #ifdef CONFIG_PM
 117         int i;
 118
 119         if (!rdev->wiphy.wowlan_config)
 120                 return;
 121         for (i = 0; i < rdev->wiphy.wowlan_config->n_patterns; i++)
 122                 kfree(rdev->wiphy.wowlan_config->patterns[i].mask);
 123         kfree(rdev->wiphy.wowlan_config->patterns);
 124         if (rdev->wiphy.wowlan_config->tcp &&
 125             rdev->wiphy.wowlan_config->tcp->sock)
 126                 sock_release(rdev->wiphy.wowlan_config->tcp->sock);
 127         kfree(rdev->wiphy.wowlan_config->tcp);
 128         kfree(rdev->wiphy.wowlan_config->nd_config);
 129         kfree(rdev->wiphy.wowlan_config);
 130 #endif
 131 }
 132
 133 extern struct workqueue_struct *cfg80211_wq;
 134 extern struct list_head cfg80211_rdev_list;
 135 extern int cfg80211_rdev_list_generation;
 136
 137 struct cfg80211_internal_bss {
 138         struct list_head list;
 139         struct list_head hidden_list;
 140         struct rb_node rbn;
 141         u64 ts_boottime;
 142         unsigned long ts;
 143         unsigned long refcount;
 144         atomic_t hold;
 145
 146         /* must be last because of priv member */
 147         struct cfg80211_bss pub;
 148 };
 149
 150 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
 151 {
 152         return container_of(pub, struct cfg80211_internal_bss, pub);
 153 }
 154
 155 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 156 {
 157         atomic_inc(&bss->hold);
 158 }
 159
 160 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 161 {
 162         int r = atomic_dec_return(&bss->hold);
 163         WARN_ON(r < 0);
 164 }
 165
 166
 167 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
 168 int get_wiphy_idx(struct wiphy *wiphy);
 169
 170 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 171
 172 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 173                           struct net *net);
 174
 175 static inline void wdev_lock(struct wireless_dev *wdev)
 176         __acquires(wdev)
 177 {
 178         mutex_lock(&wdev->mtx);
 179         __acquire(wdev->mtx);
 180 }
 181
 182 static inline void wdev_unlock(struct wireless_dev *wdev)
 183         __releases(wdev)
 184 {
 185         __release(wdev->mtx);
 186         mutex_unlock(&wdev->mtx);
 187 }
 188
 189 #define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
 190
 191 static inline bool cfg80211_has_monitors_only(struct cfg80211_registered_device *rdev)
 192 {
 193         ASSERT_RTNL();
 194
 195         return rdev->num_running_ifaces == rdev->num_running_monitor_ifaces &&
 196                rdev->num_running_ifaces > 0;
 197 }
 198
 199 enum cfg80211_event_type {
 200         EVENT_CONNECT_RESULT,
 201         EVENT_ROAMED,
 202         EVENT_DISCONNECTED,
 203         EVENT_IBSS_JOINED,
 204         EVENT_STOPPED,
 205 };
 206
 207 struct cfg80211_event {
 208         struct list_head list;
 209         enum cfg80211_event_type type;
 210
 211         union {
 212                 struct {
 213                         u8 bssid[ETH_ALEN];
 214                         const u8 *req_ie;
 215                         const u8 *resp_ie;
 216                         size_t req_ie_len;
 217                         size_t resp_ie_len;
 218                         u16 status;
 219                 } cr;
 220                 struct {
 221                         const u8 *req_ie;
 222                         const u8 *resp_ie;
 223                         size_t req_ie_len;
 224                         size_t resp_ie_len;
 225                         struct cfg80211_bss *bss;
 226                 } rm;
 227                 struct {
 228                         const u8 *ie;
 229                         size_t ie_len;
 230                         u16 reason;
 231                         bool locally_generated;
 232                 } dc;
 233                 struct {
 234                         u8 bssid[ETH_ALEN];
 235                         struct ieee80211_channel *channel;
 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 struct cfg80211_iface_destroy {
 258         struct list_head list;
 259         u32 nlportid;
 260 };
 261
 262 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev);
 263
 264 /* free object */
 265 void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 266
 267 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 *rdev);
 273 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
 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 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 282 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 283                           struct net_device *dev, bool nowext);
 284 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 285                         struct net_device *dev, bool nowext);
 286 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
 287                             struct ieee80211_channel *channel);
 288 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 289                             struct wireless_dev *wdev);
 290
 291 /* mesh */
 292 extern const struct mesh_config default_mesh_config;
 293 extern const struct mesh_setup default_mesh_setup;
 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_join_mesh(struct cfg80211_registered_device *rdev,
 299                        struct net_device *dev,
 300                        struct mesh_setup *setup,
 301                        const struct mesh_config *conf);
 302 int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 303                           struct net_device *dev);
 304 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 305                         struct net_device *dev);
 306 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 307                               struct wireless_dev *wdev,
 308                               struct cfg80211_chan_def *chandef);
 309
 310 /* OCB */
 311 int __cfg80211_join_ocb(struct cfg80211_registered_device *rdev,
 312                         struct net_device *dev,
 313                         struct ocb_setup *setup);
 314 int cfg80211_join_ocb(struct cfg80211_registered_device *rdev,
 315                       struct net_device *dev,
 316                       struct ocb_setup *setup);
 317 int __cfg80211_leave_ocb(struct cfg80211_registered_device *rdev,
 318                          struct net_device *dev);
 319 int cfg80211_leave_ocb(struct cfg80211_registered_device *rdev,
 320                        struct net_device *dev);
 321
 322 /* AP */
 323 int __cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 324                        struct net_device *dev, bool notify);
 325 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 326                      struct net_device *dev, bool notify);
 327
 328 /* MLME */
 329 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 330                        struct net_device *dev,
 331                        struct ieee80211_channel *chan,
 332                        enum nl80211_auth_type auth_type,
 333                        const u8 *bssid,
 334                        const u8 *ssid, int ssid_len,
 335                        const u8 *ie, int ie_len,
 336                        const u8 *key, int key_len, int key_idx,
 337                        const u8 *sae_data, int sae_data_len);
 338 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 339                         struct net_device *dev,
 340                         struct ieee80211_channel *chan,
 341                         const u8 *bssid,
 342                         const u8 *ssid, int ssid_len,
 343                         struct cfg80211_assoc_request *req);
 344 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 345                          struct net_device *dev, const u8 *bssid,
 346                          const u8 *ie, int ie_len, u16 reason,
 347                          bool local_state_change);
 348 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 349                            struct net_device *dev, const u8 *bssid,
 350                            const u8 *ie, int ie_len, u16 reason,
 351                            bool local_state_change);
 352 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 353                         struct net_device *dev);
 354 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
 355                                 u16 frame_type, const u8 *match_data,
 356                                 int match_len);
 357 void cfg80211_mlme_unreg_wk(struct work_struct *wk);
 358 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
 359 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
 360 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 361                           struct wireless_dev *wdev,
 362                           struct cfg80211_mgmt_tx_params *params,
 363                           u64 *cookie);
 364 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 365                                const struct ieee80211_ht_cap *ht_capa_mask);
 366 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 367                                 const struct ieee80211_vht_cap *vht_capa_mask);
 368
 369 /* SME events */
 370 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 371                      struct net_device *dev,
 372                      struct cfg80211_connect_params *connect,
 373                      struct cfg80211_cached_keys *connkeys,
 374                      const u8 *prev_bssid);
 375 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 376                                const u8 *req_ie, size_t req_ie_len,
 377                                const u8 *resp_ie, size_t resp_ie_len,
 378                                u16 status, bool wextev,
 379                                struct cfg80211_bss *bss);
 380 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 381                              size_t ie_len, u16 reason, bool from_ap);
 382 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 383                         struct net_device *dev, u16 reason,
 384                         bool wextev);
 385 void __cfg80211_roamed(struct wireless_dev *wdev,
 386                        struct cfg80211_bss *bss,
 387                        const u8 *req_ie, size_t req_ie_len,
 388                        const u8 *resp_ie, size_t resp_ie_len);
 389 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 390                               struct wireless_dev *wdev);
 391
 392 /* SME implementation */
 393 void cfg80211_conn_work(struct work_struct *work);
 394 void cfg80211_sme_scan_done(struct net_device *dev);
 395 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status);
 396 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len);
 397 void cfg80211_sme_disassoc(struct wireless_dev *wdev);
 398 void cfg80211_sme_deauth(struct wireless_dev *wdev);
 399 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev);
 400 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev);
 401 void cfg80211_sme_abandon_assoc(struct wireless_dev *wdev);
 402
 403 /* internal helpers */
 404 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
 405 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 406                                    struct key_params *params, int key_idx,
 407                                    bool pairwise, const u8 *mac_addr);
 408 void __cfg80211_scan_done(struct work_struct *wk);
 409 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
 410                            bool send_message);
 411 void __cfg80211_sched_scan_results(struct work_struct *wk);
 412 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 413                                bool driver_initiated);
 414 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
 415 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 416                           struct net_device *dev, enum nl80211_iftype ntype,
 417                           u32 *flags, struct vif_params *params);
 418 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 419 void cfg80211_process_wdev_events(struct wireless_dev *wdev);
 420
 421 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
 422                                  struct wireless_dev *wdev,
 423                                  enum nl80211_iftype iftype,
 424                                  struct ieee80211_channel *chan,
 425                                  enum cfg80211_chan_mode chanmode,
 426                                  u8 radar_detect);
 427
 428 /**
 429  * cfg80211_chandef_dfs_usable - checks if chandef is DFS usable
 430  * @wiphy: the wiphy to validate against
 431  * @chandef: the channel definition to check
 432  *
 433  * Checks if chandef is usable and we can/need start CAC on such channel.
 434  *
 435  * Return: Return true if all channels available and at least
 436  *         one channel require CAC (NL80211_DFS_USABLE)
 437  */
 438 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
 439                                  const struct cfg80211_chan_def *chandef);
 440
 441 void cfg80211_set_dfs_state(struct wiphy *wiphy,
 442                             const struct cfg80211_chan_def *chandef,
 443                             enum nl80211_dfs_state dfs_state);
 444
 445 void cfg80211_dfs_channels_update_work(struct work_struct *work);
 446
 447 unsigned int
 448 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
 449                               const struct cfg80211_chan_def *chandef);
 450
 451 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
 452 {
 453         unsigned long end = jiffies;
 454
 455         if (end >= start)
 456                 return jiffies_to_msecs(end - start);
 457
 458         return jiffies_to_msecs(end + (ULONG_MAX - start) + 1);
 459 }
 460
 461 void
 462 cfg80211_get_chan_state(struct wireless_dev *wdev,
 463                         struct ieee80211_channel **chan,
 464                         enum cfg80211_chan_mode *chanmode,
 465                         u8 *radar_detect);
 466
 467 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
 468                                  struct cfg80211_chan_def *chandef);
 469
 470 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 471                            const u8 *rates, unsigned int n_rates,
 472                            u32 *mask);
 473
 474 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 475                                  u32 beacon_int);
 476
 477 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 478                                enum nl80211_iftype iftype, int num);
 479
 480 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 481                       struct wireless_dev *wdev);
 482 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 483                     struct wireless_dev *wdev);
 484
 485 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 486                               struct wireless_dev *wdev);
 487
 488 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
 489
 490 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 491 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
 492 #else
 493 /*
 494  * Trick to enable using it as a condition,
 495  * and also not give a warning when it's
 496  * not used that way.
 497  */
 498 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
 499 #endif
 500
 501 #endif /* __NET_WIRELESS_CORE_H */