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         /* If a Country IE has been received this tells us the environment
  40          * which its telling us its in. This defaults to ENVIRON_ANY */
  41         enum environment_cap env;
  42
  43         /* wiphy index, internal only */
  44         int wiphy_idx;
  45
  46         /* associated wireless interfaces, protected by rtnl or RCU */
  47         struct list_head wdev_list;
  48         int devlist_generation, wdev_id;
  49         int opencount; /* also protected by devlist_mtx */
  50         wait_queue_head_t dev_wait;
  51
  52         struct list_head beacon_registrations;
  53         spinlock_t beacon_registrations_lock;
  54
  55         /* protected by RTNL only */
  56         int num_running_ifaces;
  57         int num_running_monitor_ifaces;
  58
  59         /* BSSes/scanning */
  60         spinlock_t bss_lock;
  61         struct list_head bss_list;
  62         struct rb_root bss_tree;
  63         u32 bss_generation;
  64         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
  65         struct cfg80211_sched_scan_request *sched_scan_req;
  66         unsigned long suspend_at;
  67         struct work_struct scan_done_wk;
  68         struct work_struct sched_scan_results_wk;
  69
  70         struct genl_info *cur_cmd_info;
  71
  72         struct work_struct conn_work;
  73         struct work_struct event_work;
  74
  75         struct delayed_work dfs_update_channels_wk;
  76
  77         /* netlink port which started critical protocol (0 means not started) */
  78         u32 crit_proto_nlportid;
  79
  80         struct cfg80211_coalesce *coalesce;
  81
  82         /* must be last because of the way we do wiphy_priv(),
  83          * and it should at least be aligned to NETDEV_ALIGN */
  84         struct wiphy wiphy __aligned(NETDEV_ALIGN);
  85 };
  86
  87 static inline
  88 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  89 {
  90         BUG_ON(!wiphy);
  91         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  92 }
  93
  94 static inline void
  95 cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
  96 {
  97 #ifdef CONFIG_PM
  98         int i;
  99
 100         if (!rdev->wiphy.wowlan_config)
 101                 return;
 102         for (i = 0; i < rdev->wiphy.wowlan_config->n_patterns; i++)
 103                 kfree(rdev->wiphy.wowlan_config->patterns[i].mask);
 104         kfree(rdev->wiphy.wowlan_config->patterns);
 105         if (rdev->wiphy.wowlan_config->tcp &&
 106             rdev->wiphy.wowlan_config->tcp->sock)
 107                 sock_release(rdev->wiphy.wowlan_config->tcp->sock);
 108         kfree(rdev->wiphy.wowlan_config->tcp);
 109         kfree(rdev->wiphy.wowlan_config);
 110 #endif
 111 }
 112
 113 extern struct workqueue_struct *cfg80211_wq;
 114 extern struct list_head cfg80211_rdev_list;
 115 extern int cfg80211_rdev_list_generation;
 116
 117 struct cfg80211_internal_bss {
 118         struct list_head list;
 119         struct list_head hidden_list;
 120         struct rb_node rbn;
 121         unsigned long ts;
 122         unsigned long refcount;
 123         atomic_t hold;
 124
 125         /* must be last because of priv member */
 126         struct cfg80211_bss pub;
 127 };
 128
 129 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
 130 {
 131         return container_of(pub, struct cfg80211_internal_bss, pub);
 132 }
 133
 134 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 135 {
 136         atomic_inc(&bss->hold);
 137 }
 138
 139 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 140 {
 141         int r = atomic_dec_return(&bss->hold);
 142         WARN_ON(r < 0);
 143 }
 144
 145
 146 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
 147 int get_wiphy_idx(struct wiphy *wiphy);
 148
 149 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 150
 151 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 152                           struct net *net);
 153
 154 static inline void wdev_lock(struct wireless_dev *wdev)
 155         __acquires(wdev)
 156 {
 157         mutex_lock(&wdev->mtx);
 158         __acquire(wdev->mtx);
 159 }
 160
 161 static inline void wdev_unlock(struct wireless_dev *wdev)
 162         __releases(wdev)
 163 {
 164         __release(wdev->mtx);
 165         mutex_unlock(&wdev->mtx);
 166 }
 167
 168 #define ASSERT_RDEV_LOCK(rdev) ASSERT_RTNL()
 169 #define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
 170
 171 static inline bool cfg80211_has_monitors_only(struct cfg80211_registered_device *rdev)
 172 {
 173         ASSERT_RTNL();
 174
 175         return rdev->num_running_ifaces == rdev->num_running_monitor_ifaces &&
 176                rdev->num_running_ifaces > 0;
 177 }
 178
 179 enum cfg80211_event_type {
 180         EVENT_CONNECT_RESULT,
 181         EVENT_ROAMED,
 182         EVENT_DISCONNECTED,
 183         EVENT_IBSS_JOINED,
 184 };
 185
 186 struct cfg80211_event {
 187         struct list_head list;
 188         enum cfg80211_event_type type;
 189
 190         union {
 191                 struct {
 192                         u8 bssid[ETH_ALEN];
 193                         const u8 *req_ie;
 194                         const u8 *resp_ie;
 195                         size_t req_ie_len;
 196                         size_t resp_ie_len;
 197                         u16 status;
 198                 } cr;
 199                 struct {
 200                         const u8 *req_ie;
 201                         const u8 *resp_ie;
 202                         size_t req_ie_len;
 203                         size_t resp_ie_len;
 204                         struct cfg80211_bss *bss;
 205                 } rm;
 206                 struct {
 207                         const u8 *ie;
 208                         size_t ie_len;
 209                         u16 reason;
 210                 } dc;
 211                 struct {
 212                         u8 bssid[ETH_ALEN];
 213                 } ij;
 214         };
 215 };
 216
 217 struct cfg80211_cached_keys {
 218         struct key_params params[6];
 219         u8 data[6][WLAN_MAX_KEY_LEN];
 220         int def, defmgmt;
 221 };
 222
 223 enum cfg80211_chan_mode {
 224         CHAN_MODE_UNDEFINED,
 225         CHAN_MODE_SHARED,
 226         CHAN_MODE_EXCLUSIVE,
 227 };
 228
 229 struct cfg80211_beacon_registration {
 230         struct list_head list;
 231         u32 nlportid;
 232 };
 233
 234 /* free object */
 235 void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 236
 237 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 238                         char *newname);
 239
 240 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 241
 242 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 243 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 244                       unsigned long age_secs);
 245
 246 /* IBSS */
 247 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 248                          struct net_device *dev,
 249                          struct cfg80211_ibss_params *params,
 250                          struct cfg80211_cached_keys *connkeys);
 251 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 252                        struct net_device *dev,
 253                        struct cfg80211_ibss_params *params,
 254                        struct cfg80211_cached_keys *connkeys);
 255 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 256 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 257                           struct net_device *dev, bool nowext);
 258 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 259                         struct net_device *dev, bool nowext);
 260 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid);
 261 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 262                             struct wireless_dev *wdev);
 263
 264 /* mesh */
 265 extern const struct mesh_config default_mesh_config;
 266 extern const struct mesh_setup default_mesh_setup;
 267 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 268                          struct net_device *dev,
 269                          struct mesh_setup *setup,
 270                          const struct mesh_config *conf);
 271 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 272                        struct net_device *dev,
 273                        struct mesh_setup *setup,
 274                        const struct mesh_config *conf);
 275 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 276                         struct net_device *dev);
 277 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 278                               struct wireless_dev *wdev,
 279                               struct cfg80211_chan_def *chandef);
 280
 281 /* AP */
 282 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 283                      struct net_device *dev);
 284
 285 /* MLME */
 286 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 287                        struct net_device *dev,
 288                        struct ieee80211_channel *chan,
 289                        enum nl80211_auth_type auth_type,
 290                        const u8 *bssid,
 291                        const u8 *ssid, int ssid_len,
 292                        const u8 *ie, int ie_len,
 293                        const u8 *key, int key_len, int key_idx,
 294                        const u8 *sae_data, int sae_data_len);
 295 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 296                         struct net_device *dev,
 297                         struct ieee80211_channel *chan,
 298                         const u8 *bssid,
 299                         const u8 *ssid, int ssid_len,
 300                         struct cfg80211_assoc_request *req);
 301 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 302                          struct net_device *dev, const u8 *bssid,
 303                          const u8 *ie, int ie_len, u16 reason,
 304                          bool local_state_change);
 305 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 306                            struct net_device *dev, const u8 *bssid,
 307                            const u8 *ie, int ie_len, u16 reason,
 308                            bool local_state_change);
 309 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 310                         struct net_device *dev);
 311 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
 312                                 u16 frame_type, const u8 *match_data,
 313                                 int match_len);
 314 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
 315 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
 316 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 317                           struct wireless_dev *wdev,
 318                           struct cfg80211_mgmt_tx_params *params,
 319                           u64 *cookie);
 320 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 321                                const struct ieee80211_ht_cap *ht_capa_mask);
 322 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 323                                 const struct ieee80211_vht_cap *vht_capa_mask);
 324
 325 /* SME events */
 326 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 327                      struct net_device *dev,
 328                      struct cfg80211_connect_params *connect,
 329                      struct cfg80211_cached_keys *connkeys,
 330                      const u8 *prev_bssid);
 331 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 332                                const u8 *req_ie, size_t req_ie_len,
 333                                const u8 *resp_ie, size_t resp_ie_len,
 334                                u16 status, bool wextev,
 335                                struct cfg80211_bss *bss);
 336 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 337                              size_t ie_len, u16 reason, bool from_ap);
 338 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 339                         struct net_device *dev, u16 reason,
 340                         bool wextev);
 341 void __cfg80211_roamed(struct wireless_dev *wdev,
 342                        struct cfg80211_bss *bss,
 343                        const u8 *req_ie, size_t req_ie_len,
 344                        const u8 *resp_ie, size_t resp_ie_len);
 345 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 346                               struct wireless_dev *wdev);
 347
 348 /* SME implementation */
 349 void cfg80211_conn_work(struct work_struct *work);
 350 void cfg80211_sme_scan_done(struct net_device *dev);
 351 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status);
 352 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len);
 353 void cfg80211_sme_disassoc(struct wireless_dev *wdev);
 354 void cfg80211_sme_deauth(struct wireless_dev *wdev);
 355 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev);
 356 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev);
 357
 358 /* internal helpers */
 359 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
 360 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 361                                    struct key_params *params, int key_idx,
 362                                    bool pairwise, const u8 *mac_addr);
 363 void __cfg80211_scan_done(struct work_struct *wk);
 364 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev);
 365 void __cfg80211_sched_scan_results(struct work_struct *wk);
 366 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 367                                bool driver_initiated);
 368 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
 369 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 370                           struct net_device *dev, enum nl80211_iftype ntype,
 371                           u32 *flags, struct vif_params *params);
 372 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 373 void cfg80211_process_wdev_events(struct wireless_dev *wdev);
 374
 375 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
 376                                  struct wireless_dev *wdev,
 377                                  enum nl80211_iftype iftype,
 378                                  struct ieee80211_channel *chan,
 379                                  enum cfg80211_chan_mode chanmode,
 380                                  u8 radar_detect);
 381
 382 /**
 383  * cfg80211_chandef_dfs_usable - checks if chandef is DFS usable
 384  * @wiphy: the wiphy to validate against
 385  * @chandef: the channel definition to check
 386  *
 387  * Checks if chandef is usable and we can/need start CAC on such channel.
 388  *
 389  * Return: Return true if all channels available and at least
 390  *         one channel require CAC (NL80211_DFS_USABLE)
 391  */
 392 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
 393                                  const struct cfg80211_chan_def *chandef);
 394
 395 void cfg80211_set_dfs_state(struct wiphy *wiphy,
 396                             const struct cfg80211_chan_def *chandef,
 397                             enum nl80211_dfs_state dfs_state);
 398
 399 void cfg80211_dfs_channels_update_work(struct work_struct *work);
 400
 401
 402 static inline int
 403 cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
 404                               struct wireless_dev *wdev,
 405                               enum nl80211_iftype iftype)
 406 {
 407         return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
 408                                             CHAN_MODE_UNDEFINED, 0);
 409 }
 410
 411 static inline int
 412 cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
 413                            enum nl80211_iftype iftype)
 414 {
 415         if (rfkill_blocked(rdev->rfkill))
 416                 return -ERFKILL;
 417
 418         return cfg80211_can_change_interface(rdev, NULL, iftype);
 419 }
 420
 421 static inline int
 422 cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
 423                       struct wireless_dev *wdev,
 424                       struct ieee80211_channel *chan,
 425                       enum cfg80211_chan_mode chanmode)
 426 {
 427         return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 428                                             chan, chanmode, 0);
 429 }
 430
 431 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
 432 {
 433         unsigned long end = jiffies;
 434
 435         if (end >= start)
 436                 return jiffies_to_msecs(end - start);
 437
 438         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
 439 }
 440
 441 void
 442 cfg80211_get_chan_state(struct wireless_dev *wdev,
 443                         struct ieee80211_channel **chan,
 444                         enum cfg80211_chan_mode *chanmode);
 445
 446 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
 447                                  struct cfg80211_chan_def *chandef);
 448
 449 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 450                            const u8 *rates, unsigned int n_rates,
 451                            u32 *mask);
 452
 453 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 454                                  u32 beacon_int);
 455
 456 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 457                                enum nl80211_iftype iftype, int num);
 458
 459 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 460                     struct wireless_dev *wdev);
 461
 462 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 463                               struct wireless_dev *wdev);
 464
 465 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
 466
 467 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 468 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
 469 #else
 470 /*
 471  * Trick to enable using it as a condition,
 472  * and also not give a warning when it's
 473  * not used that way.
 474  */
 475 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
 476 #endif
 477
 478 #endif /* __NET_WIRELESS_CORE_H */