net/mac80211/sta_info.h

   1 /*
   2  * Copyright 2002-2005, Devicescape Software, Inc.
   3  * Copyright 2013-2014  Intel Mobile Communications GmbH
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #ifndef STA_INFO_H
  11 #define STA_INFO_H
  12
  13 #include <linux/list.h>
  14 #include <linux/types.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/workqueue.h>
  17 #include <linux/average.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rhashtable.h>
  20 #include "key.h"
  21
  22 /**
  23  * enum ieee80211_sta_info_flags - Stations flags
  24  *
  25  * These flags are used with &struct sta_info's @flags member, but
  26  * only indirectly with set_sta_flag() and friends.
  27  *
  28  * @WLAN_STA_AUTH: Station is authenticated.
  29  * @WLAN_STA_ASSOC: Station is associated.
  30  * @WLAN_STA_PS_STA: Station is in power-save mode
  31  * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
  32  *      This bit is always checked so needs to be enabled for all stations
  33  *      when virtual port control is not in use.
  34  * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
  35  *      frames.
  36  * @WLAN_STA_WDS: Station is one of our WDS peers.
  37  * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
  38  *      IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
  39  *      frame to this station is transmitted.
  40  * @WLAN_STA_MFP: Management frame protection is used with this STA.
  41  * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
  42  *      during suspend/resume and station removal.
  43  * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
  44  *      power-save mode logically to flush frames that might still
  45  *      be in the queues
  46  * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
  47  *      station in power-save mode, reply when the driver unblocks.
  48  * @WLAN_STA_TDLS_PEER: Station is a TDLS peer.
  49  * @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
  50  *      packets. This means the link is enabled.
  51  * @WLAN_STA_TDLS_INITIATOR: We are the initiator of the TDLS link with this
  52  *      station.
  53  * @WLAN_STA_TDLS_CHAN_SWITCH: This TDLS peer supports TDLS channel-switching
  54  * @WLAN_STA_TDLS_OFF_CHANNEL: The local STA is currently off-channel with this
  55  *      TDLS peer
  56  * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
  57  *      keeping station in power-save mode, reply when the driver
  58  *      unblocks the station.
  59  * @WLAN_STA_SP: Station is in a service period, so don't try to
  60  *      reply to other uAPSD trigger frames or PS-Poll.
  61  * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
  62  * @WLAN_STA_INSERTED: This station is inserted into the hash table.
  63  * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
  64  * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
  65  * @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period.
  66  * @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP.
  67  * @WLAN_STA_PS_DELIVER: station woke up, but we're still blocking TX
  68  *      until pending frames are delivered
  69  */
  70 enum ieee80211_sta_info_flags {
  71         WLAN_STA_AUTH,
  72         WLAN_STA_ASSOC,
  73         WLAN_STA_PS_STA,
  74         WLAN_STA_AUTHORIZED,
  75         WLAN_STA_SHORT_PREAMBLE,
  76         WLAN_STA_WDS,
  77         WLAN_STA_CLEAR_PS_FILT,
  78         WLAN_STA_MFP,
  79         WLAN_STA_BLOCK_BA,
  80         WLAN_STA_PS_DRIVER,
  81         WLAN_STA_PSPOLL,
  82         WLAN_STA_TDLS_PEER,
  83         WLAN_STA_TDLS_PEER_AUTH,
  84         WLAN_STA_TDLS_INITIATOR,
  85         WLAN_STA_TDLS_CHAN_SWITCH,
  86         WLAN_STA_TDLS_OFF_CHANNEL,
  87         WLAN_STA_UAPSD,
  88         WLAN_STA_SP,
  89         WLAN_STA_4ADDR_EVENT,
  90         WLAN_STA_INSERTED,
  91         WLAN_STA_RATE_CONTROL,
  92         WLAN_STA_TOFFSET_KNOWN,
  93         WLAN_STA_MPSP_OWNER,
  94         WLAN_STA_MPSP_RECIPIENT,
  95         WLAN_STA_PS_DELIVER,
  96 };
  97
  98 #define ADDBA_RESP_INTERVAL HZ
  99 #define HT_AGG_MAX_RETRIES              15
 100 #define HT_AGG_BURST_RETRIES            3
 101 #define HT_AGG_RETRIES_PERIOD           (15 * HZ)
 102
 103 #define HT_AGG_STATE_DRV_READY          0
 104 #define HT_AGG_STATE_RESPONSE_RECEIVED  1
 105 #define HT_AGG_STATE_OPERATIONAL        2
 106 #define HT_AGG_STATE_STOPPING           3
 107 #define HT_AGG_STATE_WANT_START         4
 108 #define HT_AGG_STATE_WANT_STOP          5
 109
 110 enum ieee80211_agg_stop_reason {
 111         AGG_STOP_DECLINED,
 112         AGG_STOP_LOCAL_REQUEST,
 113         AGG_STOP_PEER_REQUEST,
 114         AGG_STOP_DESTROY_STA,
 115 };
 116
 117 /**
 118  * struct tid_ampdu_tx - TID aggregation information (Tx).
 119  *
 120  * @rcu_head: rcu head for freeing structure
 121  * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
 122  * @addba_resp_timer: timer for peer's response to addba request
 123  * @pending: pending frames queue -- use sta's spinlock to protect
 124  * @dialog_token: dialog token for aggregation session
 125  * @timeout: session timeout value to be filled in ADDBA requests
 126  * @state: session state (see above)
 127  * @last_tx: jiffies of last tx activity
 128  * @stop_initiator: initiator of a session stop
 129  * @tx_stop: TX DelBA frame when stopping
 130  * @buf_size: reorder buffer size at receiver
 131  * @failed_bar_ssn: ssn of the last failed BAR tx attempt
 132  * @bar_pending: BAR needs to be re-sent
 133  *
 134  * This structure's lifetime is managed by RCU, assignments to
 135  * the array holding it must hold the aggregation mutex.
 136  *
 137  * The TX path can access it under RCU lock-free if, and
 138  * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
 139  * set. Otherwise, the TX path must also acquire the spinlock
 140  * and re-check the state, see comments in the tx code
 141  * touching it.
 142  */
 143 struct tid_ampdu_tx {
 144         struct rcu_head rcu_head;
 145         struct timer_list session_timer;
 146         struct timer_list addba_resp_timer;
 147         struct sk_buff_head pending;
 148         unsigned long state;
 149         unsigned long last_tx;
 150         u16 timeout;
 151         u8 dialog_token;
 152         u8 stop_initiator;
 153         bool tx_stop;
 154         u8 buf_size;
 155
 156         u16 failed_bar_ssn;
 157         bool bar_pending;
 158 };
 159
 160 /**
 161  * struct tid_ampdu_rx - TID aggregation information (Rx).
 162  *
 163  * @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an
 164  *      A-MSDU with individually reported subframes.
 165  * @reorder_time: jiffies when skb was added
 166  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
 167  * @reorder_timer: releases expired frames from the reorder buffer.
 168  * @last_rx: jiffies of last rx activity
 169  * @head_seq_num: head sequence number in reordering buffer.
 170  * @stored_mpdu_num: number of MPDUs in reordering buffer
 171  * @ssn: Starting Sequence Number expected to be aggregated.
 172  * @buf_size: buffer size for incoming A-MPDUs
 173  * @timeout: reset timer value (in TUs).
 174  * @dialog_token: dialog token for aggregation session
 175  * @rcu_head: RCU head used for freeing this struct
 176  * @reorder_lock: serializes access to reorder buffer, see below.
 177  * @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and
 178  *      and ssn.
 179  * @removed: this session is removed (but might have been found due to RCU)
 180  *
 181  * This structure's lifetime is managed by RCU, assignments to
 182  * the array holding it must hold the aggregation mutex.
 183  *
 184  * The @reorder_lock is used to protect the members of this
 185  * struct, except for @timeout, @buf_size and @dialog_token,
 186  * which are constant across the lifetime of the struct (the
 187  * dialog token being used only for debugging).
 188  */
 189 struct tid_ampdu_rx {
 190         struct rcu_head rcu_head;
 191         spinlock_t reorder_lock;
 192         struct sk_buff_head *reorder_buf;
 193         unsigned long *reorder_time;
 194         struct timer_list session_timer;
 195         struct timer_list reorder_timer;
 196         unsigned long last_rx;
 197         u16 head_seq_num;
 198         u16 stored_mpdu_num;
 199         u16 ssn;
 200         u16 buf_size;
 201         u16 timeout;
 202         u8 dialog_token;
 203         bool auto_seq;
 204         bool removed;
 205 };
 206
 207 /**
 208  * struct sta_ampdu_mlme - STA aggregation information.
 209  *
 210  * @tid_rx: aggregation info for Rx per TID -- RCU protected
 211  * @tid_tx: aggregation info for Tx per TID
 212  * @tid_start_tx: sessions where start was requested
 213  * @addba_req_num: number of times addBA request has been sent.
 214  * @last_addba_req_time: timestamp of the last addBA request.
 215  * @dialog_token_allocator: dialog token enumerator for each new session;
 216  * @work: work struct for starting/stopping aggregation
 217  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
 218  *      RX timer expired until the work for it runs
 219  * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
 220  *      driver requested to close until the work for it runs
 221  * @mtx: mutex to protect all TX data (except non-NULL assignments
 222  *      to tid_tx[idx], which are protected by the sta spinlock)
 223  *      tid_start_tx is also protected by sta->lock.
 224  */
 225 struct sta_ampdu_mlme {
 226         struct mutex mtx;
 227         /* rx */
 228         struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
 229         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 230         unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 231         /* tx */
 232         struct work_struct work;
 233         struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
 234         struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
 235         unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
 236         u8 addba_req_num[IEEE80211_NUM_TIDS];
 237         u8 dialog_token_allocator;
 238 };
 239
 240
 241 /* Value to indicate no TID reservation */
 242 #define IEEE80211_TID_UNRESERVED        0xff
 243
 244 #define IEEE80211_FAST_XMIT_MAX_IV      18
 245
 246 /**
 247  * struct ieee80211_fast_tx - TX fastpath information
 248  * @key: key to use for hw crypto
 249  * @hdr: the 802.11 header to put with the frame
 250  * @hdr_len: actual 802.11 header length
 251  * @sa_offs: offset of the SA
 252  * @da_offs: offset of the DA
 253  * @pn_offs: offset where to put PN for crypto (or 0 if not needed)
 254  * @band: band this will be transmitted on, for tx_info
 255  * @rcu_head: RCU head to free this struct
 256  *
 257  * This struct is small enough so that the common case (maximum crypto
 258  * header length of 8 like for CCMP/GCMP) fits into a single 64-byte
 259  * cache line.
 260  */
 261 struct ieee80211_fast_tx {
 262         struct ieee80211_key *key;
 263         u8 hdr_len;
 264         u8 sa_offs, da_offs, pn_offs;
 265         u8 band;
 266         u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
 267                sizeof(rfc1042_header)];
 268
 269         struct rcu_head rcu_head;
 270 };
 271
 272 /**
 273  * struct sta_info - STA information
 274  *
 275  * This structure collects information about a station that
 276  * mac80211 is communicating with.
 277  *
 278  * @list: global linked list entry
 279  * @free_list: list entry for keeping track of stations to free
 280  * @hash_node: hash node for rhashtable
 281  * @local: pointer to the global information
 282  * @sdata: virtual interface this station belongs to
 283  * @ptk: peer keys negotiated with this station, if any
 284  * @ptk_idx: last installed peer key index
 285  * @gtk: group keys negotiated with this station, if any
 286  * @gtk_idx: last installed group key index
 287  * @rate_ctrl: rate control algorithm reference
 288  * @rate_ctrl_lock: spinlock used to protect rate control data
 289  *      (data inside the algorithm, so serializes calls there)
 290  * @rate_ctrl_priv: rate control private per-STA pointer
 291  * @last_tx_rate: rate used for last transmit, to report to userspace as
 292  *      "the" transmit rate
 293  * @last_rx_rate_idx: rx status rate index of the last data packet
 294  * @last_rx_rate_flag: rx status flag of the last data packet
 295  * @last_rx_rate_vht_flag: rx status vht flag of the last data packet
 296  * @last_rx_rate_vht_nss: rx status nss of last data packet
 297  * @lock: used for locking all fields that require locking, see comments
 298  *      in the header file.
 299  * @drv_deliver_wk: used for delivering frames after driver PS unblocking
 300  * @listen_interval: listen interval of this station, when we're acting as AP
 301  * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
 302  * @ps_lock: used for powersave (when mac80211 is the AP) related locking
 303  * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
 304  *      when it leaves power saving state or polls
 305  * @tx_filtered: buffers (per AC) of frames we already tried to
 306  *      transmit but were filtered by hardware due to STA having
 307  *      entered power saving state, these are also delivered to
 308  *      the station when it leaves powersave or polls for frames
 309  * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
 310  * @txq_buffered_tids: bitmap of TIDs that mac80211 has txq data buffered on
 311  * @rx_packets: Number of MSDUs received from this STA
 312  * @rx_bytes: Number of bytes received from this STA
 313  * @last_rx: time (in jiffies) when last frame was received from this STA
 314  * @last_connected: time (in seconds) when a station got connected
 315  * @num_duplicates: number of duplicate frames received from this STA
 316  * @rx_fragments: number of received MPDUs
 317  * @rx_dropped: number of dropped MPDUs from this STA
 318  * @last_signal: signal of last received frame from this STA
 319  * @avg_signal: moving average of signal of received frames from this STA
 320  * @last_ack_signal: signal of last received Ack frame from this STA
 321  * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
 322  * @tx_filtered_count: number of frames the hardware filtered for this STA
 323  * @tx_retry_failed: number of frames that failed retry
 324  * @tx_retry_count: total number of retries for frames to this STA
 325  * @fail_avg: moving percentage of failed MSDUs
 326  * @tx_packets: number of RX/TX MSDUs
 327  * @tx_bytes: number of bytes transmitted to this STA
 328  * @tid_seq: per-TID sequence numbers for sending to this STA
 329  * @ampdu_mlme: A-MPDU state machine state
 330  * @timer_to_tid: identity mapping to ID timers
 331  * @plink_lock: serialize access to plink fields
 332  * @llid: Local link ID
 333  * @plid: Peer link ID
 334  * @reason: Cancel reason on PLINK_HOLDING state
 335  * @plink_retries: Retries in establishment
 336  * @plink_state: peer link state
 337  * @plink_timeout: timeout of peer link
 338  * @plink_timer: peer link watch timer
 339  * @t_offset: timing offset relative to this host
 340  * @t_offset_setpoint: reference timing offset of this sta to be used when
 341  *      calculating clockdrift
 342  * @local_pm: local link-specific power save mode
 343  * @peer_pm: peer-specific power save mode towards local STA
 344  * @nonpeer_pm: STA power save mode towards non-peer neighbors
 345  * @debugfs: debug filesystem info
 346  * @dead: set to true when sta is unlinked
 347  * @uploaded: set to true when sta is uploaded to the driver
 348  * @lost_packets: number of consecutive lost packets
 349  * @sta: station information we share with the driver
 350  * @sta_state: duplicates information about station state (for debug)
 351  * @beacon_loss_count: number of times beacon loss has triggered
 352  * @rcu_head: RCU head used for freeing this station struct
 353  * @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
 354  *      taken from HT/VHT capabilities or VHT operating mode notification
 355  * @chains: chains ever used for RX from this station
 356  * @chain_signal_last: last signal (per chain)
 357  * @chain_signal_avg: signal average (per chain)
 358  * @known_smps_mode: the smps_mode the client thinks we are in. Relevant for
 359  *      AP only.
 360  * @cipher_scheme: optional cipher scheme for this station
 361  * @last_tdls_pkt_time: holds the time in jiffies of last TDLS pkt ACKed
 362  * @reserved_tid: reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED)
 363  * @tx_msdu: MSDUs transmitted to this station, using IEEE80211_NUM_TID
 364  *      entry for non-QoS frames
 365  * @tx_msdu_retries: MSDU retries for transmissions to to this station,
 366  *      using IEEE80211_NUM_TID entry for non-QoS frames
 367  * @tx_msdu_failed: MSDU failures for transmissions to to this station,
 368  *      using IEEE80211_NUM_TID entry for non-QoS frames
 369  * @rx_msdu: MSDUs received from this station, using IEEE80211_NUM_TID
 370  *      entry for non-QoS frames
 371  * @fast_tx: TX fastpath information
 372  * @processed_beacon: set to true after peer rates and capabilities are
 373  *      processed
 374  */
 375 struct sta_info {
 376         /* General information, mostly static */
 377         struct list_head list, free_list;
 378         struct rcu_head rcu_head;
 379         struct rhash_head hash_node;
 380         struct ieee80211_local *local;
 381         struct ieee80211_sub_if_data *sdata;
 382         struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
 383         struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS];
 384         u8 gtk_idx;
 385         u8 ptk_idx;
 386         struct rate_control_ref *rate_ctrl;
 387         void *rate_ctrl_priv;
 388         spinlock_t rate_ctrl_lock;
 389         spinlock_t lock;
 390
 391         struct ieee80211_fast_tx __rcu *fast_tx;
 392
 393         struct work_struct drv_deliver_wk;
 394
 395         u16 listen_interval;
 396
 397         bool dead;
 398
 399         bool uploaded;
 400
 401         enum ieee80211_sta_state sta_state;
 402
 403         /* use the accessors defined below */
 404         unsigned long _flags;
 405
 406         /* STA powersave lock and frame queues */
 407         spinlock_t ps_lock;
 408         struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
 409         struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
 410         unsigned long driver_buffered_tids;
 411         unsigned long txq_buffered_tids;
 412
 413         /* Updated from RX path only, no locking requirements */
 414         unsigned long rx_packets;
 415         u64 rx_bytes;
 416         unsigned long last_rx;
 417         long last_connected;
 418         unsigned long num_duplicates;
 419         unsigned long rx_fragments;
 420         unsigned long rx_dropped;
 421         int last_signal;
 422         struct ewma avg_signal;
 423         int last_ack_signal;
 424
 425         u8 chains;
 426         s8 chain_signal_last[IEEE80211_MAX_CHAINS];
 427         struct ewma chain_signal_avg[IEEE80211_MAX_CHAINS];
 428
 429         /* Plus 1 for non-QoS frames */
 430         __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
 431
 432         /* Updated from TX status path only, no locking requirements */
 433         unsigned long tx_filtered_count;
 434         unsigned long tx_retry_failed, tx_retry_count;
 435         /* moving percentage of failed MSDUs */
 436         unsigned int fail_avg;
 437
 438         /* Updated from TX path only, no locking requirements */
 439         u64 tx_packets[IEEE80211_NUM_ACS];
 440         u64 tx_bytes[IEEE80211_NUM_ACS];
 441         struct ieee80211_tx_rate last_tx_rate;
 442         int last_rx_rate_idx;
 443         u32 last_rx_rate_flag;
 444         u32 last_rx_rate_vht_flag;
 445         u8 last_rx_rate_vht_nss;
 446         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
 447         u64 tx_msdu[IEEE80211_NUM_TIDS + 1];
 448         u64 tx_msdu_retries[IEEE80211_NUM_TIDS + 1];
 449         u64 tx_msdu_failed[IEEE80211_NUM_TIDS + 1];
 450         u64 rx_msdu[IEEE80211_NUM_TIDS + 1];
 451
 452         /*
 453          * Aggregation information, locked with lock.
 454          */
 455         struct sta_ampdu_mlme ampdu_mlme;
 456         u8 timer_to_tid[IEEE80211_NUM_TIDS];
 457
 458 #ifdef CONFIG_MAC80211_MESH
 459         /*
 460          * Mesh peer link attributes, protected by plink_lock.
 461          * TODO: move to a sub-structure that is referenced with pointer?
 462          */
 463         spinlock_t plink_lock;
 464         u16 llid;
 465         u16 plid;
 466         u16 reason;
 467         u8 plink_retries;
 468         enum nl80211_plink_state plink_state;
 469         u32 plink_timeout;
 470         struct timer_list plink_timer;
 471
 472         s64 t_offset;
 473         s64 t_offset_setpoint;
 474         /* mesh power save */
 475         enum nl80211_mesh_power_mode local_pm;
 476         enum nl80211_mesh_power_mode peer_pm;
 477         enum nl80211_mesh_power_mode nonpeer_pm;
 478         bool processed_beacon;
 479 #endif
 480
 481 #ifdef CONFIG_MAC80211_DEBUGFS
 482         struct sta_info_debugfsdentries {
 483                 struct dentry *dir;
 484                 bool add_has_run;
 485         } debugfs;
 486 #endif
 487
 488         enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
 489
 490         unsigned int lost_packets;
 491         unsigned int beacon_loss_count;
 492
 493         enum ieee80211_smps_mode known_smps_mode;
 494         const struct ieee80211_cipher_scheme *cipher_scheme;
 495
 496         /* TDLS timeout data */
 497         unsigned long last_tdls_pkt_time;
 498
 499         u8 reserved_tid;
 500
 501         /* keep last! */
 502         struct ieee80211_sta sta;
 503 };
 504
 505 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
 506 {
 507 #ifdef CONFIG_MAC80211_MESH
 508         return sta->plink_state;
 509 #endif
 510         return NL80211_PLINK_LISTEN;
 511 }
 512
 513 static inline void set_sta_flag(struct sta_info *sta,
 514                                 enum ieee80211_sta_info_flags flag)
 515 {
 516         WARN_ON(flag == WLAN_STA_AUTH ||
 517                 flag == WLAN_STA_ASSOC ||
 518                 flag == WLAN_STA_AUTHORIZED);
 519         set_bit(flag, &sta->_flags);
 520 }
 521
 522 static inline void clear_sta_flag(struct sta_info *sta,
 523                                   enum ieee80211_sta_info_flags flag)
 524 {
 525         WARN_ON(flag == WLAN_STA_AUTH ||
 526                 flag == WLAN_STA_ASSOC ||
 527                 flag == WLAN_STA_AUTHORIZED);
 528         clear_bit(flag, &sta->_flags);
 529 }
 530
 531 static inline int test_sta_flag(struct sta_info *sta,
 532                                 enum ieee80211_sta_info_flags flag)
 533 {
 534         return test_bit(flag, &sta->_flags);
 535 }
 536
 537 static inline int test_and_clear_sta_flag(struct sta_info *sta,
 538                                           enum ieee80211_sta_info_flags flag)
 539 {
 540         WARN_ON(flag == WLAN_STA_AUTH ||
 541                 flag == WLAN_STA_ASSOC ||
 542                 flag == WLAN_STA_AUTHORIZED);
 543         return test_and_clear_bit(flag, &sta->_flags);
 544 }
 545
 546 static inline int test_and_set_sta_flag(struct sta_info *sta,
 547                                         enum ieee80211_sta_info_flags flag)
 548 {
 549         WARN_ON(flag == WLAN_STA_AUTH ||
 550                 flag == WLAN_STA_ASSOC ||
 551                 flag == WLAN_STA_AUTHORIZED);
 552         return test_and_set_bit(flag, &sta->_flags);
 553 }
 554
 555 int sta_info_move_state(struct sta_info *sta,
 556                         enum ieee80211_sta_state new_state);
 557
 558 static inline void sta_info_pre_move_state(struct sta_info *sta,
 559                                            enum ieee80211_sta_state new_state)
 560 {
 561         int ret;
 562
 563         WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
 564
 565         ret = sta_info_move_state(sta, new_state);
 566         WARN_ON_ONCE(ret);
 567 }
 568
 569
 570 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
 571                              struct tid_ampdu_tx *tid_tx);
 572
 573 static inline struct tid_ampdu_tx *
 574 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
 575 {
 576         return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
 577                                          lockdep_is_held(&sta->lock) ||
 578                                          lockdep_is_held(&sta->ampdu_mlme.mtx));
 579 }
 580
 581 /* Maximum number of frames to buffer per power saving station per AC */
 582 #define STA_MAX_TX_BUFFER       64
 583
 584 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 585  * smaller than this value, the minimum value here is used instead. */
 586 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 587
 588 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 589  */
 590 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 591
 592 /*
 593  * Get a STA info, must be under RCU read lock.
 594  */
 595 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
 596                               const u8 *addr);
 597
 598 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 599                                   const u8 *addr);
 600
 601 u32 sta_addr_hash(const void *key, u32 length, u32 seed);
 602
 603 #define _sta_bucket_idx(_tbl, _a)                                       \
 604         rht_bucket_index(_tbl, sta_addr_hash(_a, ETH_ALEN, (_tbl)->hash_rnd))
 605
 606 #define for_each_sta_info(local, tbl, _addr, _sta, _tmp)                \
 607         rht_for_each_entry_rcu(_sta, _tmp, tbl,                         \
 608                                _sta_bucket_idx(tbl, _addr),             \
 609                                hash_node)                               \
 610         /* compare address and run code only if it matches */           \
 611         if (ether_addr_equal(_sta->sta.addr, (_addr)))
 612
 613 /*
 614  * Get STA info by index, BROKEN!
 615  */
 616 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 617                                      int idx);
 618 /*
 619  * Create a new STA info, caller owns returned structure
 620  * until sta_info_insert().
 621  */
 622 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 623                                 const u8 *addr, gfp_t gfp);
 624
 625 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
 626
 627 /*
 628  * Insert STA info into hash table/list, returns zero or a
 629  * -EEXIST if (if the same MAC address is already present).
 630  *
 631  * Calling the non-rcu version makes the caller relinquish,
 632  * the _rcu version calls read_lock_rcu() and must be called
 633  * without it held.
 634  */
 635 int sta_info_insert(struct sta_info *sta);
 636 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
 637
 638 int __must_check __sta_info_destroy(struct sta_info *sta);
 639 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
 640                           const u8 *addr);
 641 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
 642                               const u8 *addr);
 643
 644 void sta_info_recalc_tim(struct sta_info *sta);
 645
 646 int sta_info_init(struct ieee80211_local *local);
 647 void sta_info_stop(struct ieee80211_local *local);
 648
 649 /**
 650  * sta_info_flush - flush matching STA entries from the STA table
 651  *
 652  * Returns the number of removed STA entries.
 653  *
 654  * @sdata: sdata to remove all stations from
 655  * @vlans: if the given interface is an AP interface, also flush VLANs
 656  */
 657 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans);
 658
 659 static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
 660 {
 661         return __sta_info_flush(sdata, false);
 662 }
 663
 664 void sta_set_rate_info_tx(struct sta_info *sta,
 665                           const struct ieee80211_tx_rate *rate,
 666                           struct rate_info *rinfo);
 667 void sta_set_rate_info_rx(struct sta_info *sta,
 668                           struct rate_info *rinfo);
 669 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo);
 670
 671 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 672                           unsigned long exp_time);
 673 u8 sta_info_tx_streams(struct sta_info *sta);
 674
 675 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
 676 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
 677 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
 678
 679 #endif /* STA_INFO_H */