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 sk_buff *scan_msg;
  66         struct cfg80211_sched_scan_request *sched_scan_req;
  67         unsigned long suspend_at;
  68         struct work_struct scan_done_wk;
  69         struct work_struct sched_scan_results_wk;
  70
  71         struct genl_info *cur_cmd_info;
  72
  73         struct work_struct conn_work;
  74         struct work_struct event_work;
  75
  76         struct delayed_work dfs_update_channels_wk;
  77
  78         /* netlink port which started critical protocol (0 means not started) */
  79         u32 crit_proto_nlportid;
  80
  81         struct cfg80211_coalesce *coalesce;
  82
  83         /* must be last because of the way we do wiphy_priv(),
  84          * and it should at least be aligned to NETDEV_ALIGN */
  85         struct wiphy wiphy __aligned(NETDEV_ALIGN);
  86 };
  87
  88 static inline
  89 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
  90 {
  91         BUG_ON(!wiphy);
  92         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
  93 }
  94
  95 static inline void
  96 cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
  97 {
  98 #ifdef CONFIG_PM
  99         int i;
 100
 101         if (!rdev->wiphy.wowlan_config)
 102                 return;
 103         for (i = 0; i < rdev->wiphy.wowlan_config->n_patterns; i++)
 104                 kfree(rdev->wiphy.wowlan_config->patterns[i].mask);
 105         kfree(rdev->wiphy.wowlan_config->patterns);
 106         if (rdev->wiphy.wowlan_config->tcp &&
 107             rdev->wiphy.wowlan_config->tcp->sock)
 108                 sock_release(rdev->wiphy.wowlan_config->tcp->sock);
 109         kfree(rdev->wiphy.wowlan_config->tcp);
 110         kfree(rdev->wiphy.wowlan_config);
 111 #endif
 112 }
 113
 114 extern struct workqueue_struct *cfg80211_wq;
 115 extern struct list_head cfg80211_rdev_list;
 116 extern int cfg80211_rdev_list_generation;
 117
 118 struct cfg80211_internal_bss {
 119         struct list_head list;
 120         struct list_head hidden_list;
 121         struct rb_node rbn;
 122         unsigned long ts;
 123         unsigned long refcount;
 124         atomic_t hold;
 125
 126         /* must be last because of priv member */
 127         struct cfg80211_bss pub;
 128 };
 129
 130 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
 131 {
 132         return container_of(pub, struct cfg80211_internal_bss, pub);
 133 }
 134
 135 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 136 {
 137         atomic_inc(&bss->hold);
 138 }
 139
 140 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 141 {
 142         int r = atomic_dec_return(&bss->hold);
 143         WARN_ON(r < 0);
 144 }
 145
 146
 147 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
 148 int get_wiphy_idx(struct wiphy *wiphy);
 149
 150 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
 151
 152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 153                           struct net *net);
 154
 155 static inline void wdev_lock(struct wireless_dev *wdev)
 156         __acquires(wdev)
 157 {
 158         mutex_lock(&wdev->mtx);
 159         __acquire(wdev->mtx);
 160 }
 161
 162 static inline void wdev_unlock(struct wireless_dev *wdev)
 163         __releases(wdev)
 164 {
 165         __release(wdev->mtx);
 166         mutex_unlock(&wdev->mtx);
 167 }
 168
 169 #define ASSERT_RDEV_LOCK(rdev) ASSERT_RTNL()
 170 #define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
 171
 172 static inline bool cfg80211_has_monitors_only(struct cfg80211_registered_device *rdev)
 173 {
 174         ASSERT_RTNL();
 175
 176         return rdev->num_running_ifaces == rdev->num_running_monitor_ifaces &&
 177                rdev->num_running_ifaces > 0;
 178 }
 179
 180 enum cfg80211_event_type {
 181         EVENT_CONNECT_RESULT,
 182         EVENT_ROAMED,
 183         EVENT_DISCONNECTED,
 184         EVENT_IBSS_JOINED,
 185 };
 186
 187 struct cfg80211_event {
 188         struct list_head list;
 189         enum cfg80211_event_type type;
 190
 191         union {
 192                 struct {
 193                         u8 bssid[ETH_ALEN];
 194                         const u8 *req_ie;
 195                         const u8 *resp_ie;
 196                         size_t req_ie_len;
 197                         size_t resp_ie_len;
 198                         u16 status;
 199                 } cr;
 200                 struct {
 201                         const u8 *req_ie;
 202                         const u8 *resp_ie;
 203                         size_t req_ie_len;
 204                         size_t resp_ie_len;
 205                         struct cfg80211_bss *bss;
 206                 } rm;
 207                 struct {
 208                         const u8 *ie;
 209                         size_t ie_len;
 210                         u16 reason;
 211                 } dc;
 212                 struct {
 213                         u8 bssid[ETH_ALEN];
 214                         struct ieee80211_channel *channel;
 215                 } ij;
 216         };
 217 };
 218
 219 struct cfg80211_cached_keys {
 220         struct key_params params[6];
 221         u8 data[6][WLAN_MAX_KEY_LEN];
 222         int def, defmgmt;
 223 };
 224
 225 enum cfg80211_chan_mode {
 226         CHAN_MODE_UNDEFINED,
 227         CHAN_MODE_SHARED,
 228         CHAN_MODE_EXCLUSIVE,
 229 };
 230
 231 struct cfg80211_beacon_registration {
 232         struct list_head list;
 233         u32 nlportid;
 234 };
 235
 236 /* free object */
 237 void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 238
 239 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 240                         char *newname);
 241
 242 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 243
 244 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 245 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 246                       unsigned long age_secs);
 247
 248 /* IBSS */
 249 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 250                          struct net_device *dev,
 251                          struct cfg80211_ibss_params *params,
 252                          struct cfg80211_cached_keys *connkeys);
 253 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 254                        struct net_device *dev,
 255                        struct cfg80211_ibss_params *params,
 256                        struct cfg80211_cached_keys *connkeys);
 257 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 258 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 259                           struct net_device *dev, bool nowext);
 260 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 261                         struct net_device *dev, bool nowext);
 262 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
 263                             struct ieee80211_channel *channel);
 264 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 265                             struct wireless_dev *wdev);
 266
 267 /* mesh */
 268 extern const struct mesh_config default_mesh_config;
 269 extern const struct mesh_setup default_mesh_setup;
 270 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 271                          struct net_device *dev,
 272                          struct mesh_setup *setup,
 273                          const struct mesh_config *conf);
 274 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 275                        struct net_device *dev,
 276                        struct mesh_setup *setup,
 277                        const struct mesh_config *conf);
 278 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 279                         struct net_device *dev);
 280 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 281                               struct wireless_dev *wdev,
 282                               struct cfg80211_chan_def *chandef);
 283
 284 /* AP */
 285 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 286                      struct net_device *dev);
 287
 288 /* MLME */
 289 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 290                        struct net_device *dev,
 291                        struct ieee80211_channel *chan,
 292                        enum nl80211_auth_type auth_type,
 293                        const u8 *bssid,
 294                        const u8 *ssid, int ssid_len,
 295                        const u8 *ie, int ie_len,
 296                        const u8 *key, int key_len, int key_idx,
 297                        const u8 *sae_data, int sae_data_len);
 298 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 299                         struct net_device *dev,
 300                         struct ieee80211_channel *chan,
 301                         const u8 *bssid,
 302                         const u8 *ssid, int ssid_len,
 303                         struct cfg80211_assoc_request *req);
 304 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 305                          struct net_device *dev, const u8 *bssid,
 306                          const u8 *ie, int ie_len, u16 reason,
 307                          bool local_state_change);
 308 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 309                            struct net_device *dev, const u8 *bssid,
 310                            const u8 *ie, int ie_len, u16 reason,
 311                            bool local_state_change);
 312 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 313                         struct net_device *dev);
 314 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
 315                                 u16 frame_type, const u8 *match_data,
 316                                 int match_len);
 317 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
 318 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
 319 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 320                           struct wireless_dev *wdev,
 321                           struct cfg80211_mgmt_tx_params *params,
 322                           u64 *cookie);
 323 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 324                                const struct ieee80211_ht_cap *ht_capa_mask);
 325 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 326                                 const struct ieee80211_vht_cap *vht_capa_mask);
 327
 328 /* SME events */
 329 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 330                      struct net_device *dev,
 331                      struct cfg80211_connect_params *connect,
 332                      struct cfg80211_cached_keys *connkeys,
 333                      const u8 *prev_bssid);
 334 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 335                                const u8 *req_ie, size_t req_ie_len,
 336                                const u8 *resp_ie, size_t resp_ie_len,
 337                                u16 status, bool wextev,
 338                                struct cfg80211_bss *bss);
 339 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 340                              size_t ie_len, u16 reason, bool from_ap);
 341 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 342                         struct net_device *dev, u16 reason,
 343                         bool wextev);
 344 void __cfg80211_roamed(struct wireless_dev *wdev,
 345                        struct cfg80211_bss *bss,
 346                        const u8 *req_ie, size_t req_ie_len,
 347                        const u8 *resp_ie, size_t resp_ie_len);
 348 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 349                               struct wireless_dev *wdev);
 350
 351 /* SME implementation */
 352 void cfg80211_conn_work(struct work_struct *work);
 353 void cfg80211_sme_scan_done(struct net_device *dev);
 354 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status);
 355 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len);
 356 void cfg80211_sme_disassoc(struct wireless_dev *wdev);
 357 void cfg80211_sme_deauth(struct wireless_dev *wdev);
 358 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev);
 359 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev);
 360
 361 /* internal helpers */
 362 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
 363 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 364                                    struct key_params *params, int key_idx,
 365                                    bool pairwise, const u8 *mac_addr);
 366 void __cfg80211_scan_done(struct work_struct *wk);
 367 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
 368                            bool send_message);
 369 void __cfg80211_sched_scan_results(struct work_struct *wk);
 370 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 371                                bool driver_initiated);
 372 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
 373 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 374                           struct net_device *dev, enum nl80211_iftype ntype,
 375                           u32 *flags, struct vif_params *params);
 376 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 377 void cfg80211_process_wdev_events(struct wireless_dev *wdev);
 378
 379 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
 380                                  struct wireless_dev *wdev,
 381                                  enum nl80211_iftype iftype,
 382                                  struct ieee80211_channel *chan,
 383                                  enum cfg80211_chan_mode chanmode,
 384                                  u8 radar_detect);
 385
 386 /**
 387  * cfg80211_chandef_dfs_usable - checks if chandef is DFS usable
 388  * @wiphy: the wiphy to validate against
 389  * @chandef: the channel definition to check
 390  *
 391  * Checks if chandef is usable and we can/need start CAC on such channel.
 392  *
 393  * Return: Return true if all channels available and at least
 394  *         one channel require CAC (NL80211_DFS_USABLE)
 395  */
 396 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
 397                                  const struct cfg80211_chan_def *chandef);
 398
 399 void cfg80211_set_dfs_state(struct wiphy *wiphy,
 400                             const struct cfg80211_chan_def *chandef,
 401                             enum nl80211_dfs_state dfs_state);
 402
 403 void cfg80211_dfs_channels_update_work(struct work_struct *work);
 404
 405
 406 static inline int
 407 cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
 408                               struct wireless_dev *wdev,
 409                               enum nl80211_iftype iftype)
 410 {
 411         return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
 412                                             CHAN_MODE_UNDEFINED, 0);
 413 }
 414
 415 static inline int
 416 cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
 417                            enum nl80211_iftype iftype)
 418 {
 419         if (rfkill_blocked(rdev->rfkill))
 420                 return -ERFKILL;
 421
 422         return cfg80211_can_change_interface(rdev, NULL, iftype);
 423 }
 424
 425 static inline int
 426 cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
 427                       struct wireless_dev *wdev,
 428                       struct ieee80211_channel *chan,
 429                       enum cfg80211_chan_mode chanmode)
 430 {
 431         return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 432                                             chan, chanmode, 0);
 433 }
 434
 435 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
 436 {
 437         unsigned long end = jiffies;
 438
 439         if (end >= start)
 440                 return jiffies_to_msecs(end - start);
 441
 442         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
 443 }
 444
 445 void
 446 cfg80211_get_chan_state(struct wireless_dev *wdev,
 447                         struct ieee80211_channel **chan,
 448                         enum cfg80211_chan_mode *chanmode,
 449                         u8 *radar_detect);
 450
 451 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
 452                                  struct cfg80211_chan_def *chandef);
 453
 454 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 455                            const u8 *rates, unsigned int n_rates,
 456                            u32 *mask);
 457
 458 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 459                                  u32 beacon_int);
 460
 461 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 462                                enum nl80211_iftype iftype, int num);
 463
 464 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 465                     struct wireless_dev *wdev);
 466
 467 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 468                               struct wireless_dev *wdev);
 469
 470 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
 471
 472 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 473 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
 474 #else
 475 /*
 476  * Trick to enable using it as a condition,
 477  * and also not give a warning when it's
 478  * not used that way.
 479  */
 480 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
 481 #endif
 482
 483 #endif /* __NET_WIRELESS_CORE_H */