net/mac80211/sta_info.h

   1 /*
   2  * Copyright 2002-2005, Devicescape Software, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef STA_INFO_H
  10 #define STA_INFO_H
  11
  12 #include <linux/list.h>
  13 #include <linux/types.h>
  14 #include <linux/if_ether.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/average.h>
  17 #include <linux/etherdevice.h>
  18 #include "key.h"
  19
  20 /**
  21  * enum ieee80211_sta_info_flags - Stations flags
  22  *
  23  * These flags are used with &struct sta_info's @flags member, but
  24  * only indirectly with set_sta_flag() and friends.
  25  *
  26  * @WLAN_STA_AUTH: Station is authenticated.
  27  * @WLAN_STA_ASSOC: Station is associated.
  28  * @WLAN_STA_PS_STA: Station is in power-save mode
  29  * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
  30  *      This bit is always checked so needs to be enabled for all stations
  31  *      when virtual port control is not in use.
  32  * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
  33  *      frames.
  34  * @WLAN_STA_WME: Station is a QoS-STA.
  35  * @WLAN_STA_WDS: Station is one of our WDS peers.
  36  * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
  37  *      IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
  38  *      frame to this station is transmitted.
  39  * @WLAN_STA_MFP: Management frame protection is used with this STA.
  40  * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
  41  *      during suspend/resume and station removal.
  42  * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
  43  *      power-save mode logically to flush frames that might still
  44  *      be in the queues
  45  * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
  46  *      station in power-save mode, reply when the driver unblocks.
  47  * @WLAN_STA_TDLS_PEER: Station is a TDLS peer.
  48  * @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
  49  *      packets. This means the link is enabled.
  50  * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
  51  *      keeping station in power-save mode, reply when the driver
  52  *      unblocks the station.
  53  * @WLAN_STA_SP: Station is in a service period, so don't try to
  54  *      reply to other uAPSD trigger frames or PS-Poll.
  55  * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
  56  * @WLAN_STA_INSERTED: This station is inserted into the hash table.
  57  * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
  58  * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
  59  */
  60 enum ieee80211_sta_info_flags {
  61         WLAN_STA_AUTH,
  62         WLAN_STA_ASSOC,
  63         WLAN_STA_PS_STA,
  64         WLAN_STA_AUTHORIZED,
  65         WLAN_STA_SHORT_PREAMBLE,
  66         WLAN_STA_WME,
  67         WLAN_STA_WDS,
  68         WLAN_STA_CLEAR_PS_FILT,
  69         WLAN_STA_MFP,
  70         WLAN_STA_BLOCK_BA,
  71         WLAN_STA_PS_DRIVER,
  72         WLAN_STA_PSPOLL,
  73         WLAN_STA_TDLS_PEER,
  74         WLAN_STA_TDLS_PEER_AUTH,
  75         WLAN_STA_UAPSD,
  76         WLAN_STA_SP,
  77         WLAN_STA_4ADDR_EVENT,
  78         WLAN_STA_INSERTED,
  79         WLAN_STA_RATE_CONTROL,
  80         WLAN_STA_TOFFSET_KNOWN,
  81 };
  82
  83 #define ADDBA_RESP_INTERVAL HZ
  84 #define HT_AGG_MAX_RETRIES              15
  85 #define HT_AGG_BURST_RETRIES            3
  86 #define HT_AGG_RETRIES_PERIOD           (15 * HZ)
  87
  88 #define HT_AGG_STATE_DRV_READY          0
  89 #define HT_AGG_STATE_RESPONSE_RECEIVED  1
  90 #define HT_AGG_STATE_OPERATIONAL        2
  91 #define HT_AGG_STATE_STOPPING           3
  92 #define HT_AGG_STATE_WANT_START         4
  93 #define HT_AGG_STATE_WANT_STOP          5
  94
  95 /**
  96  * struct tid_ampdu_tx - TID aggregation information (Tx).
  97  *
  98  * @rcu_head: rcu head for freeing structure
  99  * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
 100  * @addba_resp_timer: timer for peer's response to addba request
 101  * @pending: pending frames queue -- use sta's spinlock to protect
 102  * @dialog_token: dialog token for aggregation session
 103  * @timeout: session timeout value to be filled in ADDBA requests
 104  * @state: session state (see above)
 105  * @last_tx: jiffies of last tx activity
 106  * @stop_initiator: initiator of a session stop
 107  * @tx_stop: TX DelBA frame when stopping
 108  * @buf_size: reorder buffer size at receiver
 109  * @failed_bar_ssn: ssn of the last failed BAR tx attempt
 110  * @bar_pending: BAR needs to be re-sent
 111  *
 112  * This structure's lifetime is managed by RCU, assignments to
 113  * the array holding it must hold the aggregation mutex.
 114  *
 115  * The TX path can access it under RCU lock-free if, and
 116  * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
 117  * set. Otherwise, the TX path must also acquire the spinlock
 118  * and re-check the state, see comments in the tx code
 119  * touching it.
 120  */
 121 struct tid_ampdu_tx {
 122         struct rcu_head rcu_head;
 123         struct timer_list session_timer;
 124         struct timer_list addba_resp_timer;
 125         struct sk_buff_head pending;
 126         unsigned long state;
 127         unsigned long last_tx;
 128         u16 timeout;
 129         u8 dialog_token;
 130         u8 stop_initiator;
 131         bool tx_stop;
 132         u8 buf_size;
 133
 134         u16 failed_bar_ssn;
 135         bool bar_pending;
 136 };
 137
 138 /**
 139  * struct tid_ampdu_rx - TID aggregation information (Rx).
 140  *
 141  * @reorder_buf: buffer to reorder incoming aggregated MPDUs
 142  * @reorder_time: jiffies when skb was added
 143  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
 144  * @reorder_timer: releases expired frames from the reorder buffer.
 145  * @last_rx: jiffies of last rx activity
 146  * @head_seq_num: head sequence number in reordering buffer.
 147  * @stored_mpdu_num: number of MPDUs in reordering buffer
 148  * @ssn: Starting Sequence Number expected to be aggregated.
 149  * @buf_size: buffer size for incoming A-MPDUs
 150  * @timeout: reset timer value (in TUs).
 151  * @dialog_token: dialog token for aggregation session
 152  * @rcu_head: RCU head used for freeing this struct
 153  * @reorder_lock: serializes access to reorder buffer, see below.
 154  *
 155  * This structure's lifetime is managed by RCU, assignments to
 156  * the array holding it must hold the aggregation mutex.
 157  *
 158  * The @reorder_lock is used to protect the members of this
 159  * struct, except for @timeout, @buf_size and @dialog_token,
 160  * which are constant across the lifetime of the struct (the
 161  * dialog token being used only for debugging).
 162  */
 163 struct tid_ampdu_rx {
 164         struct rcu_head rcu_head;
 165         spinlock_t reorder_lock;
 166         struct sk_buff **reorder_buf;
 167         unsigned long *reorder_time;
 168         struct timer_list session_timer;
 169         struct timer_list reorder_timer;
 170         unsigned long last_rx;
 171         u16 head_seq_num;
 172         u16 stored_mpdu_num;
 173         u16 ssn;
 174         u16 buf_size;
 175         u16 timeout;
 176         u8 dialog_token;
 177 };
 178
 179 /**
 180  * struct sta_ampdu_mlme - STA aggregation information.
 181  *
 182  * @tid_rx: aggregation info for Rx per TID -- RCU protected
 183  * @tid_tx: aggregation info for Tx per TID
 184  * @tid_start_tx: sessions where start was requested
 185  * @addba_req_num: number of times addBA request has been sent.
 186  * @last_addba_req_time: timestamp of the last addBA request.
 187  * @dialog_token_allocator: dialog token enumerator for each new session;
 188  * @work: work struct for starting/stopping aggregation
 189  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
 190  *      RX timer expired until the work for it runs
 191  * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
 192  *      driver requested to close until the work for it runs
 193  * @mtx: mutex to protect all TX data (except non-NULL assignments
 194  *      to tid_tx[idx], which are protected by the sta spinlock)
 195  */
 196 struct sta_ampdu_mlme {
 197         struct mutex mtx;
 198         /* rx */
 199         struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
 200         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 201         unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 202         /* tx */
 203         struct work_struct work;
 204         struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
 205         struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
 206         unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
 207         u8 addba_req_num[IEEE80211_NUM_TIDS];
 208         u8 dialog_token_allocator;
 209 };
 210
 211
 212 /**
 213  * struct sta_info - STA information
 214  *
 215  * This structure collects information about a station that
 216  * mac80211 is communicating with.
 217  *
 218  * @list: global linked list entry
 219  * @hnext: hash table linked list pointer
 220  * @local: pointer to the global information
 221  * @sdata: virtual interface this station belongs to
 222  * @ptk: peer key negotiated with this station, if any
 223  * @gtk: group keys negotiated with this station, if any
 224  * @rate_ctrl: rate control algorithm reference
 225  * @rate_ctrl_priv: rate control private per-STA pointer
 226  * @last_tx_rate: rate used for last transmit, to report to userspace as
 227  *      "the" transmit rate
 228  * @last_rx_rate_idx: rx status rate index of the last data packet
 229  * @last_rx_rate_flag: rx status flag of the last data packet
 230  * @last_rx_rate_vht_nss: rx status nss of last data packet
 231  * @lock: used for locking all fields that require locking, see comments
 232  *      in the header file.
 233  * @drv_unblock_wk: used for driver PS unblocking
 234  * @listen_interval: listen interval of this station, when we're acting as AP
 235  * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
 236  * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
 237  *      when it leaves power saving state or polls
 238  * @tx_filtered: buffers (per AC) of frames we already tried to
 239  *      transmit but were filtered by hardware due to STA having
 240  *      entered power saving state, these are also delivered to
 241  *      the station when it leaves powersave or polls for frames
 242  * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
 243  * @rx_packets: Number of MSDUs received from this STA
 244  * @rx_bytes: Number of bytes received from this STA
 245  * @wep_weak_iv_count: number of weak WEP IVs received from this station
 246  * @last_rx: time (in jiffies) when last frame was received from this STA
 247  * @last_connected: time (in seconds) when a station got connected
 248  * @num_duplicates: number of duplicate frames received from this STA
 249  * @rx_fragments: number of received MPDUs
 250  * @rx_dropped: number of dropped MPDUs from this STA
 251  * @last_signal: signal of last received frame from this STA
 252  * @avg_signal: moving average of signal of received frames from this STA
 253  * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
 254  * @tx_filtered_count: number of frames the hardware filtered for this STA
 255  * @tx_retry_failed: number of frames that failed retry
 256  * @tx_retry_count: total number of retries for frames to this STA
 257  * @fail_avg: moving percentage of failed MSDUs
 258  * @tx_packets: number of RX/TX MSDUs
 259  * @tx_bytes: number of bytes transmitted to this STA
 260  * @tx_fragments: number of transmitted MPDUs
 261  * @tid_seq: per-TID sequence numbers for sending to this STA
 262  * @ampdu_mlme: A-MPDU state machine state
 263  * @timer_to_tid: identity mapping to ID timers
 264  * @llid: Local link ID
 265  * @plid: Peer link ID
 266  * @reason: Cancel reason on PLINK_HOLDING state
 267  * @plink_retries: Retries in establishment
 268  * @ignore_plink_timer: ignore the peer-link timer (used internally)
 269  * @plink_state: peer link state
 270  * @plink_timeout: timeout of peer link
 271  * @plink_timer: peer link watch timer
 272  * @plink_timer_was_running: used by suspend/resume to restore timers
 273  * @t_offset: timing offset relative to this host
 274  * @t_offset_setpoint: reference timing offset of this sta to be used when
 275  *      calculating clockdrift
 276  * @ch_width: peer's channel width
 277  * @debugfs: debug filesystem info
 278  * @dead: set to true when sta is unlinked
 279  * @uploaded: set to true when sta is uploaded to the driver
 280  * @lost_packets: number of consecutive lost packets
 281  * @sta: station information we share with the driver
 282  * @sta_state: duplicates information about station state (for debug)
 283  * @beacon_loss_count: number of times beacon loss has triggered
 284  * @supports_40mhz: tracks whether the station advertised 40 MHz support
 285  *      as we overwrite its HT parameters with the currently used value
 286  */
 287 struct sta_info {
 288         /* General information, mostly static */
 289         struct list_head list;
 290         struct rcu_head rcu_head;
 291         struct sta_info __rcu *hnext;
 292         struct ieee80211_local *local;
 293         struct ieee80211_sub_if_data *sdata;
 294         struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
 295         struct ieee80211_key __rcu *ptk;
 296         struct rate_control_ref *rate_ctrl;
 297         void *rate_ctrl_priv;
 298         spinlock_t lock;
 299
 300         struct work_struct drv_unblock_wk;
 301         struct work_struct free_sta_wk;
 302
 303         u16 listen_interval;
 304
 305         bool dead;
 306
 307         bool uploaded;
 308
 309         enum ieee80211_sta_state sta_state;
 310
 311         /* use the accessors defined below */
 312         unsigned long _flags;
 313
 314         /*
 315          * STA powersave frame queues, no more than the internal
 316          * locking required.
 317          */
 318         struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
 319         struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
 320         unsigned long driver_buffered_tids;
 321
 322         /* Updated from RX path only, no locking requirements */
 323         unsigned long rx_packets, rx_bytes;
 324         unsigned long wep_weak_iv_count;
 325         unsigned long last_rx;
 326         long last_connected;
 327         unsigned long num_duplicates;
 328         unsigned long rx_fragments;
 329         unsigned long rx_dropped;
 330         int last_signal;
 331         struct ewma avg_signal;
 332         /* Plus 1 for non-QoS frames */
 333         __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
 334
 335         /* Updated from TX status path only, no locking requirements */
 336         unsigned long tx_filtered_count;
 337         unsigned long tx_retry_failed, tx_retry_count;
 338         /* moving percentage of failed MSDUs */
 339         unsigned int fail_avg;
 340
 341         /* Updated from TX path only, no locking requirements */
 342         unsigned long tx_packets;
 343         unsigned long tx_bytes;
 344         unsigned long tx_fragments;
 345         struct ieee80211_tx_rate last_tx_rate;
 346         int last_rx_rate_idx;
 347         u32 last_rx_rate_flag;
 348         u8 last_rx_rate_vht_nss;
 349         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
 350
 351         /*
 352          * Aggregation information, locked with lock.
 353          */
 354         struct sta_ampdu_mlme ampdu_mlme;
 355         u8 timer_to_tid[IEEE80211_NUM_TIDS];
 356
 357 #ifdef CONFIG_MAC80211_MESH
 358         /*
 359          * Mesh peer link attributes
 360          * TODO: move to a sub-structure that is referenced with pointer?
 361          */
 362         __le16 llid;
 363         __le16 plid;
 364         __le16 reason;
 365         u8 plink_retries;
 366         bool ignore_plink_timer;
 367         bool plink_timer_was_running;
 368         enum nl80211_plink_state plink_state;
 369         u32 plink_timeout;
 370         struct timer_list plink_timer;
 371         s64 t_offset;
 372         s64 t_offset_setpoint;
 373         enum nl80211_chan_width ch_width;
 374 #endif
 375
 376 #ifdef CONFIG_MAC80211_DEBUGFS
 377         struct sta_info_debugfsdentries {
 378                 struct dentry *dir;
 379                 bool add_has_run;
 380         } debugfs;
 381 #endif
 382
 383         unsigned int lost_packets;
 384         unsigned int beacon_loss_count;
 385
 386         bool supports_40mhz;
 387
 388         /* keep last! */
 389         struct ieee80211_sta sta;
 390 };
 391
 392 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
 393 {
 394 #ifdef CONFIG_MAC80211_MESH
 395         return sta->plink_state;
 396 #endif
 397         return NL80211_PLINK_LISTEN;
 398 }
 399
 400 static inline void set_sta_flag(struct sta_info *sta,
 401                                 enum ieee80211_sta_info_flags flag)
 402 {
 403         WARN_ON(flag == WLAN_STA_AUTH ||
 404                 flag == WLAN_STA_ASSOC ||
 405                 flag == WLAN_STA_AUTHORIZED);
 406         set_bit(flag, &sta->_flags);
 407 }
 408
 409 static inline void clear_sta_flag(struct sta_info *sta,
 410                                   enum ieee80211_sta_info_flags flag)
 411 {
 412         WARN_ON(flag == WLAN_STA_AUTH ||
 413                 flag == WLAN_STA_ASSOC ||
 414                 flag == WLAN_STA_AUTHORIZED);
 415         clear_bit(flag, &sta->_flags);
 416 }
 417
 418 static inline int test_sta_flag(struct sta_info *sta,
 419                                 enum ieee80211_sta_info_flags flag)
 420 {
 421         return test_bit(flag, &sta->_flags);
 422 }
 423
 424 static inline int test_and_clear_sta_flag(struct sta_info *sta,
 425                                           enum ieee80211_sta_info_flags flag)
 426 {
 427         WARN_ON(flag == WLAN_STA_AUTH ||
 428                 flag == WLAN_STA_ASSOC ||
 429                 flag == WLAN_STA_AUTHORIZED);
 430         return test_and_clear_bit(flag, &sta->_flags);
 431 }
 432
 433 static inline int test_and_set_sta_flag(struct sta_info *sta,
 434                                         enum ieee80211_sta_info_flags flag)
 435 {
 436         WARN_ON(flag == WLAN_STA_AUTH ||
 437                 flag == WLAN_STA_ASSOC ||
 438                 flag == WLAN_STA_AUTHORIZED);
 439         return test_and_set_bit(flag, &sta->_flags);
 440 }
 441
 442 int sta_info_move_state(struct sta_info *sta,
 443                         enum ieee80211_sta_state new_state);
 444
 445 static inline void sta_info_pre_move_state(struct sta_info *sta,
 446                                            enum ieee80211_sta_state new_state)
 447 {
 448         int ret;
 449
 450         WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
 451
 452         ret = sta_info_move_state(sta, new_state);
 453         WARN_ON_ONCE(ret);
 454 }
 455
 456
 457 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
 458                              struct tid_ampdu_tx *tid_tx);
 459
 460 static inline struct tid_ampdu_tx *
 461 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
 462 {
 463         return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
 464                                          lockdep_is_held(&sta->lock) ||
 465                                          lockdep_is_held(&sta->ampdu_mlme.mtx));
 466 }
 467
 468 #define STA_HASH_SIZE 256
 469 #define STA_HASH(sta) (sta[5])
 470
 471
 472 /* Maximum number of frames to buffer per power saving station per AC */
 473 #define STA_MAX_TX_BUFFER       64
 474
 475 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 476  * smaller than this value, the minimum value here is used instead. */
 477 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 478
 479 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 480  */
 481 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 482
 483 /*
 484  * Get a STA info, must be under RCU read lock.
 485  */
 486 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
 487                               const u8 *addr);
 488
 489 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 490                                   const u8 *addr);
 491
 492 static inline
 493 void for_each_sta_info_type_check(struct ieee80211_local *local,
 494                                   const u8 *addr,
 495                                   struct sta_info *sta,
 496                                   struct sta_info *nxt)
 497 {
 498 }
 499
 500 #define for_each_sta_info(local, _addr, _sta, nxt)                      \
 501         for (   /* initialise loop */                                   \
 502                 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
 503                 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL;       \
 504                 /* typecheck */                                         \
 505                 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
 506                 /* continue condition */                                \
 507                 _sta;                                                   \
 508                 /* advance loop */                                      \
 509                 _sta = nxt,                                             \
 510                 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL        \
 511              )                                                          \
 512         /* compare address and run code only if it matches */           \
 513         if (ether_addr_equal(_sta->sta.addr, (_addr)))
 514
 515 /*
 516  * Get STA info by index, BROKEN!
 517  */
 518 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 519                                      int idx);
 520 /*
 521  * Create a new STA info, caller owns returned structure
 522  * until sta_info_insert().
 523  */
 524 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 525                                 const u8 *addr, gfp_t gfp);
 526
 527 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
 528
 529 /*
 530  * Insert STA info into hash table/list, returns zero or a
 531  * -EEXIST if (if the same MAC address is already present).
 532  *
 533  * Calling the non-rcu version makes the caller relinquish,
 534  * the _rcu version calls read_lock_rcu() and must be called
 535  * without it held.
 536  */
 537 int sta_info_insert(struct sta_info *sta);
 538 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
 539
 540 int __must_check __sta_info_destroy(struct sta_info *sta);
 541 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
 542                           const u8 *addr);
 543 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
 544                               const u8 *addr);
 545
 546 void sta_info_recalc_tim(struct sta_info *sta);
 547
 548 void sta_info_init(struct ieee80211_local *local);
 549 void sta_info_stop(struct ieee80211_local *local);
 550 int sta_info_flush(struct ieee80211_local *local,
 551                    struct ieee80211_sub_if_data *sdata);
 552 void sta_set_rate_info_tx(struct sta_info *sta,
 553                           const struct ieee80211_tx_rate *rate,
 554                           struct rate_info *rinfo);
 555 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 556                           unsigned long exp_time);
 557
 558 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
 559 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
 560 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
 561
 562 #endif /* STA_INFO_H */