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_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                         struct ieee80211_channel *channel;
 214                 } ij;
 215         };
 216 };
 217
 218 struct cfg80211_cached_keys {
 219         struct key_params params[6];
 220         u8 data[6][WLAN_MAX_KEY_LEN];
 221         int def, defmgmt;
 222 };
 223
 224 enum cfg80211_chan_mode {
 225         CHAN_MODE_UNDEFINED,
 226         CHAN_MODE_SHARED,
 227         CHAN_MODE_EXCLUSIVE,
 228 };
 229
 230 struct cfg80211_beacon_registration {
 231         struct list_head list;
 232         u32 nlportid;
 233 };
 234
 235 /* free object */
 236 void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 237
 238 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 239                         char *newname);
 240
 241 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 242
 243 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
 244 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 245                       unsigned long age_secs);
 246
 247 /* IBSS */
 248 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 249                        struct net_device *dev,
 250                        struct cfg80211_ibss_params *params,
 251                        struct cfg80211_cached_keys *connkeys);
 252 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 253 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 254                           struct net_device *dev, bool nowext);
 255 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 256                         struct net_device *dev, bool nowext);
 257 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
 258                             struct ieee80211_channel *channel);
 259 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 260                             struct wireless_dev *wdev);
 261
 262 /* mesh */
 263 extern const struct mesh_config default_mesh_config;
 264 extern const struct mesh_setup default_mesh_setup;
 265 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 266                          struct net_device *dev,
 267                          struct mesh_setup *setup,
 268                          const struct mesh_config *conf);
 269 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 270                        struct net_device *dev,
 271                        struct mesh_setup *setup,
 272                        const struct mesh_config *conf);
 273 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 274                         struct net_device *dev);
 275 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 276                               struct wireless_dev *wdev,
 277                               struct cfg80211_chan_def *chandef);
 278
 279 /* AP */
 280 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 281                      struct net_device *dev, bool notify);
 282
 283 /* MLME */
 284 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 285                        struct net_device *dev,
 286                        struct ieee80211_channel *chan,
 287                        enum nl80211_auth_type auth_type,
 288                        const u8 *bssid,
 289                        const u8 *ssid, int ssid_len,
 290                        const u8 *ie, int ie_len,
 291                        const u8 *key, int key_len, int key_idx,
 292                        const u8 *sae_data, int sae_data_len);
 293 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 294                         struct net_device *dev,
 295                         struct ieee80211_channel *chan,
 296                         const u8 *bssid,
 297                         const u8 *ssid, int ssid_len,
 298                         struct cfg80211_assoc_request *req);
 299 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 300                          struct net_device *dev, const u8 *bssid,
 301                          const u8 *ie, int ie_len, u16 reason,
 302                          bool local_state_change);
 303 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 304                            struct net_device *dev, const u8 *bssid,
 305                            const u8 *ie, int ie_len, u16 reason,
 306                            bool local_state_change);
 307 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 308                         struct net_device *dev);
 309 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
 310                                 u16 frame_type, const u8 *match_data,
 311                                 int match_len);
 312 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
 313 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
 314 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 315                           struct wireless_dev *wdev,
 316                           struct cfg80211_mgmt_tx_params *params,
 317                           u64 *cookie);
 318 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 319                                const struct ieee80211_ht_cap *ht_capa_mask);
 320 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 321                                 const struct ieee80211_vht_cap *vht_capa_mask);
 322
 323 /* SME events */
 324 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 325                      struct net_device *dev,
 326                      struct cfg80211_connect_params *connect,
 327                      struct cfg80211_cached_keys *connkeys,
 328                      const u8 *prev_bssid);
 329 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 330                                const u8 *req_ie, size_t req_ie_len,
 331                                const u8 *resp_ie, size_t resp_ie_len,
 332                                u16 status, bool wextev,
 333                                struct cfg80211_bss *bss);
 334 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 335                              size_t ie_len, u16 reason, bool from_ap);
 336 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 337                         struct net_device *dev, u16 reason,
 338                         bool wextev);
 339 void __cfg80211_roamed(struct wireless_dev *wdev,
 340                        struct cfg80211_bss *bss,
 341                        const u8 *req_ie, size_t req_ie_len,
 342                        const u8 *resp_ie, size_t resp_ie_len);
 343 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 344                               struct wireless_dev *wdev);
 345
 346 /* SME implementation */
 347 void cfg80211_conn_work(struct work_struct *work);
 348 void cfg80211_sme_scan_done(struct net_device *dev);
 349 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status);
 350 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len);
 351 void cfg80211_sme_disassoc(struct wireless_dev *wdev);
 352 void cfg80211_sme_deauth(struct wireless_dev *wdev);
 353 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev);
 354 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev);
 355
 356 /* internal helpers */
 357 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
 358 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 359                                    struct key_params *params, int key_idx,
 360                                    bool pairwise, const u8 *mac_addr);
 361 void __cfg80211_scan_done(struct work_struct *wk);
 362 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
 363                            bool send_message);
 364 void __cfg80211_sched_scan_results(struct work_struct *wk);
 365 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 366                                bool driver_initiated);
 367 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
 368 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 369                           struct net_device *dev, enum nl80211_iftype ntype,
 370                           u32 *flags, struct vif_params *params);
 371 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 372 void cfg80211_process_wdev_events(struct wireless_dev *wdev);
 373
 374 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
 375                                  struct wireless_dev *wdev,
 376                                  enum nl80211_iftype iftype,
 377                                  struct ieee80211_channel *chan,
 378                                  enum cfg80211_chan_mode chanmode,
 379                                  u8 radar_detect);
 380
 381 /**
 382  * cfg80211_chandef_dfs_usable - checks if chandef is DFS usable
 383  * @wiphy: the wiphy to validate against
 384  * @chandef: the channel definition to check
 385  *
 386  * Checks if chandef is usable and we can/need start CAC on such channel.
 387  *
 388  * Return: Return true if all channels available and at least
 389  *         one channel require CAC (NL80211_DFS_USABLE)
 390  */
 391 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
 392                                  const struct cfg80211_chan_def *chandef);
 393
 394 void cfg80211_set_dfs_state(struct wiphy *wiphy,
 395                             const struct cfg80211_chan_def *chandef,
 396                             enum nl80211_dfs_state dfs_state);
 397
 398 void cfg80211_dfs_channels_update_work(struct work_struct *work);
 399
 400 unsigned int
 401 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
 402                               const struct cfg80211_chan_def *chandef);
 403
 404 static inline int
 405 cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
 406                               struct wireless_dev *wdev,
 407                               enum nl80211_iftype iftype)
 408 {
 409         return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
 410                                             CHAN_MODE_UNDEFINED, 0);
 411 }
 412
 413 static inline int
 414 cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
 415                            enum nl80211_iftype iftype)
 416 {
 417         if (rfkill_blocked(rdev->rfkill))
 418                 return -ERFKILL;
 419
 420         return cfg80211_can_change_interface(rdev, NULL, iftype);
 421 }
 422
 423 static inline int
 424 cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
 425                       struct wireless_dev *wdev,
 426                       struct ieee80211_channel *chan,
 427                       enum cfg80211_chan_mode chanmode)
 428 {
 429         return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 430                                             chan, chanmode, 0);
 431 }
 432
 433 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
 434 {
 435         unsigned long end = jiffies;
 436
 437         if (end >= start)
 438                 return jiffies_to_msecs(end - start);
 439
 440         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
 441 }
 442
 443 void
 444 cfg80211_get_chan_state(struct wireless_dev *wdev,
 445                         struct ieee80211_channel **chan,
 446                         enum cfg80211_chan_mode *chanmode,
 447                         u8 *radar_detect);
 448
 449 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
 450                                  struct cfg80211_chan_def *chandef);
 451
 452 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 453                            const u8 *rates, unsigned int n_rates,
 454                            u32 *mask);
 455
 456 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 457                                  u32 beacon_int);
 458
 459 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 460                                enum nl80211_iftype iftype, int num);
 461
 462 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 463                     struct wireless_dev *wdev);
 464
 465 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 466                               struct wireless_dev *wdev);
 467
 468 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
 469
 470 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 471 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
 472 #else
 473 /*
 474  * Trick to enable using it as a condition,
 475  * and also not give a warning when it's
 476  * not used that way.
 477  */
 478 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
 479 #endif
 480
 481 #endif /* __NET_WIRELESS_CORE_H */