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         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
  76         struct sk_buff *scan_msg;
  77         struct cfg80211_sched_scan_request __rcu *sched_scan_req;
  78         unsigned long suspend_at;
  79         struct work_struct scan_done_wk;
  80         struct work_struct sched_scan_results_wk;
  81
  82         struct genl_info *cur_cmd_info;
  83
  84         struct work_struct conn_work;
  85         struct work_struct event_work;
  86
  87         struct delayed_work dfs_update_channels_wk;
  88
  89         /* netlink port which started critical protocol (0 means not started) */
  90         u32 crit_proto_nlportid;
  91
  92         struct cfg80211_coalesce *coalesce;
  93
  94         spinlock_t destroy_list_lock;
  95         struct list_head destroy_list;
  96         struct work_struct destroy_work;
  97
  98         struct work_struct sched_scan_stop_wk;
  99
 100         /* must be last because of the way we do wiphy_priv(),
 101          * and it should at least be aligned to NETDEV_ALIGN */
 102         struct wiphy wiphy __aligned(NETDEV_ALIGN);
 103 };
 104
 105 static inline
 106 struct cfg80211_registered_device *wiphy_to_rdev(struct wiphy *wiphy)
 107 {
 108         BUG_ON(!wiphy);
 109         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
 110 }
 111
 112 static inline void
 113 cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
 114 {
 115 #ifdef CONFIG_PM
 116         int i;
 117
 118         if (!rdev->wiphy.wowlan_config)
 119                 return;
 120         for (i = 0; i < rdev->wiphy.wowlan_config->n_patterns; i++)
 121                 kfree(rdev->wiphy.wowlan_config->patterns[i].mask);
 122         kfree(rdev->wiphy.wowlan_config->patterns);
 123         if (rdev->wiphy.wowlan_config->tcp &&
 124             rdev->wiphy.wowlan_config->tcp->sock)
 125                 sock_release(rdev->wiphy.wowlan_config->tcp->sock);
 126         kfree(rdev->wiphy.wowlan_config->tcp);
 127         kfree(rdev->wiphy.wowlan_config->nd_config);
 128         kfree(rdev->wiphy.wowlan_config);
 129 #endif
 130 }
 131
 132 extern struct workqueue_struct *cfg80211_wq;
 133 extern struct list_head cfg80211_rdev_list;
 134 extern int cfg80211_rdev_list_generation;
 135
 136 struct cfg80211_internal_bss {
 137         struct list_head list;
 138         struct list_head hidden_list;
 139         struct rb_node rbn;
 140         unsigned long ts;
 141         unsigned long refcount;
 142         atomic_t hold;
 143
 144         /* must be last because of priv member */
 145         struct cfg80211_bss pub;
 146 };
 147
 148 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
 149 {
 150         return container_of(pub, struct cfg80211_internal_bss, pub);
 151 }
 152
 153 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 154 {
 155         atomic_inc(&bss->hold);
 156 }
 157
 158 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 159 {
 160         int r = atomic_dec_return(&bss->hold);
 161         WARN_ON(r < 0);
 162 }
 163
 164
 165 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
 166 int get_wiphy_idx(struct wiphy *wiphy);
 167
 168 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 169
 170 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 171                           struct net *net);
 172
 173 static inline void wdev_lock(struct wireless_dev *wdev)
 174         __acquires(wdev)
 175 {
 176         mutex_lock(&wdev->mtx);
 177         __acquire(wdev->mtx);
 178 }
 179
 180 static inline void wdev_unlock(struct wireless_dev *wdev)
 181         __releases(wdev)
 182 {
 183         __release(wdev->mtx);
 184         mutex_unlock(&wdev->mtx);
 185 }
 186
 187 #define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
 188
 189 static inline bool cfg80211_has_monitors_only(struct cfg80211_registered_device *rdev)
 190 {
 191         ASSERT_RTNL();
 192
 193         return rdev->num_running_ifaces == rdev->num_running_monitor_ifaces &&
 194                rdev->num_running_ifaces > 0;
 195 }
 196
 197 enum cfg80211_event_type {
 198         EVENT_CONNECT_RESULT,
 199         EVENT_ROAMED,
 200         EVENT_DISCONNECTED,
 201         EVENT_IBSS_JOINED,
 202         EVENT_STOPPED,
 203 };
 204
 205 struct cfg80211_event {
 206         struct list_head list;
 207         enum cfg80211_event_type type;
 208
 209         union {
 210                 struct {
 211                         u8 bssid[ETH_ALEN];
 212                         const u8 *req_ie;
 213                         const u8 *resp_ie;
 214                         size_t req_ie_len;
 215                         size_t resp_ie_len;
 216                         u16 status;
 217                 } cr;
 218                 struct {
 219                         const u8 *req_ie;
 220                         const u8 *resp_ie;
 221                         size_t req_ie_len;
 222                         size_t resp_ie_len;
 223                         struct cfg80211_bss *bss;
 224                 } rm;
 225                 struct {
 226                         const u8 *ie;
 227                         size_t ie_len;
 228                         u16 reason;
 229                         bool locally_generated;
 230                 } dc;
 231                 struct {
 232                         u8 bssid[ETH_ALEN];
 233                         struct ieee80211_channel *channel;
 234                 } ij;
 235         };
 236 };
 237
 238 struct cfg80211_cached_keys {
 239         struct key_params params[6];
 240         u8 data[6][WLAN_MAX_KEY_LEN];
 241         int def, defmgmt;
 242 };
 243
 244 enum cfg80211_chan_mode {
 245         CHAN_MODE_UNDEFINED,
 246         CHAN_MODE_SHARED,
 247         CHAN_MODE_EXCLUSIVE,
 248 };
 249
 250 struct cfg80211_beacon_registration {
 251         struct list_head list;
 252         u32 nlportid;
 253 };
 254
 255 struct cfg80211_iface_destroy {
 256         struct list_head list;
 257         u32 nlportid;
 258 };
 259
 260 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev);
 261
 262 /* free object */
 263 void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 264
 265 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 266                         char *newname);
 267
 268 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 269
 270 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev);
 271 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
 272                       unsigned long age_secs);
 273
 274 /* IBSS */
 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                             struct ieee80211_channel *channel);
 286 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 287                             struct wireless_dev *wdev);
 288
 289 /* mesh */
 290 extern const struct mesh_config default_mesh_config;
 291 extern const struct mesh_setup default_mesh_setup;
 292 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 293                          struct net_device *dev,
 294                          struct mesh_setup *setup,
 295                          const struct mesh_config *conf);
 296 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 297                        struct net_device *dev,
 298                        struct mesh_setup *setup,
 299                        const struct mesh_config *conf);
 300 int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 301                           struct net_device *dev);
 302 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 303                         struct net_device *dev);
 304 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 305                               struct wireless_dev *wdev,
 306                               struct cfg80211_chan_def *chandef);
 307
 308 /* OCB */
 309 int __cfg80211_join_ocb(struct cfg80211_registered_device *rdev,
 310                         struct net_device *dev,
 311                         struct ocb_setup *setup);
 312 int cfg80211_join_ocb(struct cfg80211_registered_device *rdev,
 313                       struct net_device *dev,
 314                       struct ocb_setup *setup);
 315 int __cfg80211_leave_ocb(struct cfg80211_registered_device *rdev,
 316                          struct net_device *dev);
 317 int cfg80211_leave_ocb(struct cfg80211_registered_device *rdev,
 318                        struct net_device *dev);
 319
 320 /* AP */
 321 int __cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 322                        struct net_device *dev, bool notify);
 323 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 324                      struct net_device *dev, bool notify);
 325
 326 /* MLME */
 327 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 328                        struct net_device *dev,
 329                        struct ieee80211_channel *chan,
 330                        enum nl80211_auth_type auth_type,
 331                        const u8 *bssid,
 332                        const u8 *ssid, int ssid_len,
 333                        const u8 *ie, int ie_len,
 334                        const u8 *key, int key_len, int key_idx,
 335                        const u8 *sae_data, int sae_data_len);
 336 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 337                         struct net_device *dev,
 338                         struct ieee80211_channel *chan,
 339                         const u8 *bssid,
 340                         const u8 *ssid, int ssid_len,
 341                         struct cfg80211_assoc_request *req);
 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_disassoc(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 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 351                         struct net_device *dev);
 352 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
 353                                 u16 frame_type, const u8 *match_data,
 354                                 int match_len);
 355 void cfg80211_mlme_unreg_wk(struct work_struct *wk);
 356 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
 357 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
 358 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 359                           struct wireless_dev *wdev,
 360                           struct cfg80211_mgmt_tx_params *params,
 361                           u64 *cookie);
 362 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 363                                const struct ieee80211_ht_cap *ht_capa_mask);
 364 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 365                                 const struct ieee80211_vht_cap *vht_capa_mask);
 366
 367 /* SME events */
 368 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 369                      struct net_device *dev,
 370                      struct cfg80211_connect_params *connect,
 371                      struct cfg80211_cached_keys *connkeys,
 372                      const u8 *prev_bssid);
 373 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 374                                const u8 *req_ie, size_t req_ie_len,
 375                                const u8 *resp_ie, size_t resp_ie_len,
 376                                u16 status, bool wextev,
 377                                struct cfg80211_bss *bss);
 378 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 379                              size_t ie_len, u16 reason, bool from_ap);
 380 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 381                         struct net_device *dev, u16 reason,
 382                         bool wextev);
 383 void __cfg80211_roamed(struct wireless_dev *wdev,
 384                        struct cfg80211_bss *bss,
 385                        const u8 *req_ie, size_t req_ie_len,
 386                        const u8 *resp_ie, size_t resp_ie_len);
 387 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 388                               struct wireless_dev *wdev);
 389
 390 /* SME implementation */
 391 void cfg80211_conn_work(struct work_struct *work);
 392 void cfg80211_sme_scan_done(struct net_device *dev);
 393 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status);
 394 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len);
 395 void cfg80211_sme_disassoc(struct wireless_dev *wdev);
 396 void cfg80211_sme_deauth(struct wireless_dev *wdev);
 397 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev);
 398 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev);
 399
 400 /* internal helpers */
 401 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
 402 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 403                                    struct key_params *params, int key_idx,
 404                                    bool pairwise, const u8 *mac_addr);
 405 void __cfg80211_scan_done(struct work_struct *wk);
 406 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
 407                            bool send_message);
 408 void __cfg80211_sched_scan_results(struct work_struct *wk);
 409 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 410                                bool driver_initiated);
 411 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
 412 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 413                           struct net_device *dev, enum nl80211_iftype ntype,
 414                           u32 *flags, struct vif_params *params);
 415 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 416 void cfg80211_process_wdev_events(struct wireless_dev *wdev);
 417
 418 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
 419                                  struct wireless_dev *wdev,
 420                                  enum nl80211_iftype iftype,
 421                                  struct ieee80211_channel *chan,
 422                                  enum cfg80211_chan_mode chanmode,
 423                                  u8 radar_detect);
 424
 425 /**
 426  * cfg80211_chandef_dfs_usable - checks if chandef is DFS usable
 427  * @wiphy: the wiphy to validate against
 428  * @chandef: the channel definition to check
 429  *
 430  * Checks if chandef is usable and we can/need start CAC on such channel.
 431  *
 432  * Return: Return true if all channels available and at least
 433  *         one channel require CAC (NL80211_DFS_USABLE)
 434  */
 435 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
 436                                  const struct cfg80211_chan_def *chandef);
 437
 438 void cfg80211_set_dfs_state(struct wiphy *wiphy,
 439                             const struct cfg80211_chan_def *chandef,
 440                             enum nl80211_dfs_state dfs_state);
 441
 442 void cfg80211_dfs_channels_update_work(struct work_struct *work);
 443
 444 unsigned int
 445 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
 446                               const struct cfg80211_chan_def *chandef);
 447
 448 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
 449 {
 450         unsigned long end = jiffies;
 451
 452         if (end >= start)
 453                 return jiffies_to_msecs(end - start);
 454
 455         return jiffies_to_msecs(end + (ULONG_MAX - start) + 1);
 456 }
 457
 458 void
 459 cfg80211_get_chan_state(struct wireless_dev *wdev,
 460                         struct ieee80211_channel **chan,
 461                         enum cfg80211_chan_mode *chanmode,
 462                         u8 *radar_detect);
 463
 464 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
 465                                  struct cfg80211_chan_def *chandef);
 466
 467 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 468                            const u8 *rates, unsigned int n_rates,
 469                            u32 *mask);
 470
 471 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 472                                  u32 beacon_int);
 473
 474 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 475                                enum nl80211_iftype iftype, int num);
 476
 477 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 478                       struct wireless_dev *wdev);
 479 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 480                     struct wireless_dev *wdev);
 481
 482 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 483                               struct wireless_dev *wdev);
 484
 485 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
 486
 487 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 488 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
 489 #else
 490 /*
 491  * Trick to enable using it as a condition,
 492  * and also not give a warning when it's
 493  * not used that way.
 494  */
 495 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
 496 #endif
 497
 498 #endif /* __NET_WIRELESS_CORE_H */