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_TDLS_WIDER_BW: This TDLS peer supports working on a wider bw on
  57  *      the BSS base channel.
  58  * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
  59  *      keeping station in power-save mode, reply when the driver
  60  *      unblocks the station.
  61  * @WLAN_STA_SP: Station is in a service period, so don't try to
  62  *      reply to other uAPSD trigger frames or PS-Poll.
  63  * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
  64  * @WLAN_STA_INSERTED: This station is inserted into the hash table.
  65  * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
  66  * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
  67  * @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period.
  68  * @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP.
  69  * @WLAN_STA_PS_DELIVER: station woke up, but we're still blocking TX
  70  *      until pending frames are delivered
  71  */
  72 enum ieee80211_sta_info_flags {
  73         WLAN_STA_AUTH,
  74         WLAN_STA_ASSOC,
  75         WLAN_STA_PS_STA,
  76         WLAN_STA_AUTHORIZED,
  77         WLAN_STA_SHORT_PREAMBLE,
  78         WLAN_STA_WDS,
  79         WLAN_STA_CLEAR_PS_FILT,
  80         WLAN_STA_MFP,
  81         WLAN_STA_BLOCK_BA,
  82         WLAN_STA_PS_DRIVER,
  83         WLAN_STA_PSPOLL,
  84         WLAN_STA_TDLS_PEER,
  85         WLAN_STA_TDLS_PEER_AUTH,
  86         WLAN_STA_TDLS_INITIATOR,
  87         WLAN_STA_TDLS_CHAN_SWITCH,
  88         WLAN_STA_TDLS_OFF_CHANNEL,
  89         WLAN_STA_TDLS_WIDER_BW,
  90         WLAN_STA_UAPSD,
  91         WLAN_STA_SP,
  92         WLAN_STA_4ADDR_EVENT,
  93         WLAN_STA_INSERTED,
  94         WLAN_STA_RATE_CONTROL,
  95         WLAN_STA_TOFFSET_KNOWN,
  96         WLAN_STA_MPSP_OWNER,
  97         WLAN_STA_MPSP_RECIPIENT,
  98         WLAN_STA_PS_DELIVER,
  99 };
 100
 101 #define ADDBA_RESP_INTERVAL HZ
 102 #define HT_AGG_MAX_RETRIES              15
 103 #define HT_AGG_BURST_RETRIES            3
 104 #define HT_AGG_RETRIES_PERIOD           (15 * HZ)
 105
 106 #define HT_AGG_STATE_DRV_READY          0
 107 #define HT_AGG_STATE_RESPONSE_RECEIVED  1
 108 #define HT_AGG_STATE_OPERATIONAL        2
 109 #define HT_AGG_STATE_STOPPING           3
 110 #define HT_AGG_STATE_WANT_START         4
 111 #define HT_AGG_STATE_WANT_STOP          5
 112
 113 enum ieee80211_agg_stop_reason {
 114         AGG_STOP_DECLINED,
 115         AGG_STOP_LOCAL_REQUEST,
 116         AGG_STOP_PEER_REQUEST,
 117         AGG_STOP_DESTROY_STA,
 118 };
 119
 120 /**
 121  * struct tid_ampdu_tx - TID aggregation information (Tx).
 122  *
 123  * @rcu_head: rcu head for freeing structure
 124  * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
 125  * @addba_resp_timer: timer for peer's response to addba request
 126  * @pending: pending frames queue -- use sta's spinlock to protect
 127  * @dialog_token: dialog token for aggregation session
 128  * @timeout: session timeout value to be filled in ADDBA requests
 129  * @state: session state (see above)
 130  * @last_tx: jiffies of last tx activity
 131  * @stop_initiator: initiator of a session stop
 132  * @tx_stop: TX DelBA frame when stopping
 133  * @buf_size: reorder buffer size at receiver
 134  * @failed_bar_ssn: ssn of the last failed BAR tx attempt
 135  * @bar_pending: BAR needs to be re-sent
 136  * @amsdu: support A-MSDU withing A-MDPU
 137  *
 138  * This structure's lifetime is managed by RCU, assignments to
 139  * the array holding it must hold the aggregation mutex.
 140  *
 141  * The TX path can access it under RCU lock-free if, and
 142  * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
 143  * set. Otherwise, the TX path must also acquire the spinlock
 144  * and re-check the state, see comments in the tx code
 145  * touching it.
 146  */
 147 struct tid_ampdu_tx {
 148         struct rcu_head rcu_head;
 149         struct timer_list session_timer;
 150         struct timer_list addba_resp_timer;
 151         struct sk_buff_head pending;
 152         unsigned long state;
 153         unsigned long last_tx;
 154         u16 timeout;
 155         u8 dialog_token;
 156         u8 stop_initiator;
 157         bool tx_stop;
 158         u8 buf_size;
 159
 160         u16 failed_bar_ssn;
 161         bool bar_pending;
 162         bool amsdu;
 163 };
 164
 165 /**
 166  * struct tid_ampdu_rx - TID aggregation information (Rx).
 167  *
 168  * @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an
 169  *      A-MSDU with individually reported subframes.
 170  * @reorder_time: jiffies when skb was added
 171  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
 172  * @reorder_timer: releases expired frames from the reorder buffer.
 173  * @last_rx: jiffies of last rx activity
 174  * @head_seq_num: head sequence number in reordering buffer.
 175  * @stored_mpdu_num: number of MPDUs in reordering buffer
 176  * @ssn: Starting Sequence Number expected to be aggregated.
 177  * @buf_size: buffer size for incoming A-MPDUs
 178  * @timeout: reset timer value (in TUs).
 179  * @dialog_token: dialog token for aggregation session
 180  * @rcu_head: RCU head used for freeing this struct
 181  * @reorder_lock: serializes access to reorder buffer, see below.
 182  * @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and
 183  *      and ssn.
 184  * @removed: this session is removed (but might have been found due to RCU)
 185  *
 186  * This structure's lifetime is managed by RCU, assignments to
 187  * the array holding it must hold the aggregation mutex.
 188  *
 189  * The @reorder_lock is used to protect the members of this
 190  * struct, except for @timeout, @buf_size and @dialog_token,
 191  * which are constant across the lifetime of the struct (the
 192  * dialog token being used only for debugging).
 193  */
 194 struct tid_ampdu_rx {
 195         struct rcu_head rcu_head;
 196         spinlock_t reorder_lock;
 197         struct sk_buff_head *reorder_buf;
 198         unsigned long *reorder_time;
 199         struct timer_list session_timer;
 200         struct timer_list reorder_timer;
 201         unsigned long last_rx;
 202         u16 head_seq_num;
 203         u16 stored_mpdu_num;
 204         u16 ssn;
 205         u16 buf_size;
 206         u16 timeout;
 207         u8 dialog_token;
 208         bool auto_seq;
 209         bool removed;
 210 };
 211
 212 /**
 213  * struct sta_ampdu_mlme - STA aggregation information.
 214  *
 215  * @tid_rx: aggregation info for Rx per TID -- RCU protected
 216  * @tid_tx: aggregation info for Tx per TID
 217  * @tid_start_tx: sessions where start was requested
 218  * @addba_req_num: number of times addBA request has been sent.
 219  * @last_addba_req_time: timestamp of the last addBA request.
 220  * @dialog_token_allocator: dialog token enumerator for each new session;
 221  * @work: work struct for starting/stopping aggregation
 222  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
 223  *      RX timer expired until the work for it runs
 224  * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
 225  *      driver requested to close until the work for it runs
 226  * @mtx: mutex to protect all TX data (except non-NULL assignments
 227  *      to tid_tx[idx], which are protected by the sta spinlock)
 228  *      tid_start_tx is also protected by sta->lock.
 229  */
 230 struct sta_ampdu_mlme {
 231         struct mutex mtx;
 232         /* rx */
 233         struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
 234         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 235         unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 236         /* tx */
 237         struct work_struct work;
 238         struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
 239         struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
 240         unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
 241         u8 addba_req_num[IEEE80211_NUM_TIDS];
 242         u8 dialog_token_allocator;
 243 };
 244
 245
 246 /* Value to indicate no TID reservation */
 247 #define IEEE80211_TID_UNRESERVED        0xff
 248
 249 #define IEEE80211_FAST_XMIT_MAX_IV      18
 250
 251 /**
 252  * struct ieee80211_fast_tx - TX fastpath information
 253  * @key: key to use for hw crypto
 254  * @hdr: the 802.11 header to put with the frame
 255  * @hdr_len: actual 802.11 header length
 256  * @sa_offs: offset of the SA
 257  * @da_offs: offset of the DA
 258  * @pn_offs: offset where to put PN for crypto (or 0 if not needed)
 259  * @band: band this will be transmitted on, for tx_info
 260  * @rcu_head: RCU head to free this struct
 261  *
 262  * This struct is small enough so that the common case (maximum crypto
 263  * header length of 8 like for CCMP/GCMP) fits into a single 64-byte
 264  * cache line.
 265  */
 266 struct ieee80211_fast_tx {
 267         struct ieee80211_key *key;
 268         u8 hdr_len;
 269         u8 sa_offs, da_offs, pn_offs;
 270         u8 band;
 271         u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
 272                sizeof(rfc1042_header)] __aligned(2);
 273
 274         struct rcu_head rcu_head;
 275 };
 276
 277 /**
 278  * struct mesh_sta - mesh STA information
 279  * @plink_lock: serialize access to plink fields
 280  * @llid: Local link ID
 281  * @plid: Peer link ID
 282  * @aid: local aid supplied by peer
 283  * @reason: Cancel reason on PLINK_HOLDING state
 284  * @plink_retries: Retries in establishment
 285  * @plink_state: peer link state
 286  * @plink_timeout: timeout of peer link
 287  * @plink_timer: peer link watch timer
 288  * @t_offset: timing offset relative to this host
 289  * @t_offset_setpoint: reference timing offset of this sta to be used when
 290  *      calculating clockdrift
 291  * @local_pm: local link-specific power save mode
 292  * @peer_pm: peer-specific power save mode towards local STA
 293  * @nonpeer_pm: STA power save mode towards non-peer neighbors
 294  * @processed_beacon: set to true after peer rates and capabilities are
 295  *      processed
 296  * @fail_avg: moving percentage of failed MSDUs
 297  */
 298 struct mesh_sta {
 299         struct timer_list plink_timer;
 300
 301         s64 t_offset;
 302         s64 t_offset_setpoint;
 303
 304         spinlock_t plink_lock;
 305         u16 llid;
 306         u16 plid;
 307         u16 aid;
 308         u16 reason;
 309         u8 plink_retries;
 310
 311         bool processed_beacon;
 312
 313         enum nl80211_plink_state plink_state;
 314         u32 plink_timeout;
 315
 316         /* mesh power save */
 317         enum nl80211_mesh_power_mode local_pm;
 318         enum nl80211_mesh_power_mode peer_pm;
 319         enum nl80211_mesh_power_mode nonpeer_pm;
 320
 321         /* moving percentage of failed MSDUs */
 322         unsigned int fail_avg;
 323 };
 324
 325 DECLARE_EWMA(signal, 1024, 8)
 326
 327 /**
 328  * struct sta_info - STA information
 329  *
 330  * This structure collects information about a station that
 331  * mac80211 is communicating with.
 332  *
 333  * @list: global linked list entry
 334  * @free_list: list entry for keeping track of stations to free
 335  * @hash_node: hash node for rhashtable
 336  * @addr: station's MAC address - duplicated from public part to
 337  *      let the hash table work with just a single cacheline
 338  * @local: pointer to the global information
 339  * @sdata: virtual interface this station belongs to
 340  * @ptk: peer keys negotiated with this station, if any
 341  * @ptk_idx: last installed peer key index
 342  * @gtk: group keys negotiated with this station, if any
 343  * @rate_ctrl: rate control algorithm reference
 344  * @rate_ctrl_lock: spinlock used to protect rate control data
 345  *      (data inside the algorithm, so serializes calls there)
 346  * @rate_ctrl_priv: rate control private per-STA pointer
 347  * @lock: used for locking all fields that require locking, see comments
 348  *      in the header file.
 349  * @drv_deliver_wk: used for delivering frames after driver PS unblocking
 350  * @listen_interval: listen interval of this station, when we're acting as AP
 351  * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
 352  * @ps_lock: used for powersave (when mac80211 is the AP) related locking
 353  * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
 354  *      when it leaves power saving state or polls
 355  * @tx_filtered: buffers (per AC) of frames we already tried to
 356  *      transmit but were filtered by hardware due to STA having
 357  *      entered power saving state, these are also delivered to
 358  *      the station when it leaves powersave or polls for frames
 359  * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
 360  * @txq_buffered_tids: bitmap of TIDs that mac80211 has txq data buffered on
 361  * @last_connected: time (in seconds) when a station got connected
 362  * @last_seq_ctrl: last received seq/frag number from this STA (per TID
 363  *      plus one for non-QoS frames)
 364  * @tid_seq: per-TID sequence numbers for sending to this STA
 365  * @ampdu_mlme: A-MPDU state machine state
 366  * @timer_to_tid: identity mapping to ID timers
 367  * @mesh: mesh STA information
 368  * @debugfs: debug filesystem info
 369  * @dead: set to true when sta is unlinked
 370  * @uploaded: set to true when sta is uploaded to the driver
 371  * @sta: station information we share with the driver
 372  * @sta_state: duplicates information about station state (for debug)
 373  * @beacon_loss_count: number of times beacon loss has triggered
 374  * @rcu_head: RCU head used for freeing this station struct
 375  * @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
 376  *      taken from HT/VHT capabilities or VHT operating mode notification
 377  * @known_smps_mode: the smps_mode the client thinks we are in. Relevant for
 378  *      AP only.
 379  * @cipher_scheme: optional cipher scheme for this station
 380  * @reserved_tid: reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED)
 381  * @fast_tx: TX fastpath information
 382  * @tdls_chandef: a TDLS peer can have a wider chandef that is compatible to
 383  *      the BSS one.
 384  * @tx_stats: TX statistics
 385  * @rx_stats: RX statistics
 386  * @status_stats: TX status statistics
 387  */
 388 struct sta_info {
 389         /* General information, mostly static */
 390         struct list_head list, free_list;
 391         struct rcu_head rcu_head;
 392         struct rhash_head hash_node;
 393         u8 addr[ETH_ALEN];
 394         struct ieee80211_local *local;
 395         struct ieee80211_sub_if_data *sdata;
 396         struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
 397         struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS];
 398         u8 ptk_idx;
 399         struct rate_control_ref *rate_ctrl;
 400         void *rate_ctrl_priv;
 401         spinlock_t rate_ctrl_lock;
 402         spinlock_t lock;
 403
 404         struct ieee80211_fast_tx __rcu *fast_tx;
 405
 406 #ifdef CONFIG_MAC80211_MESH
 407         struct mesh_sta *mesh;
 408 #endif
 409
 410         struct work_struct drv_deliver_wk;
 411
 412         u16 listen_interval;
 413
 414         bool dead;
 415
 416         bool uploaded;
 417
 418         enum ieee80211_sta_state sta_state;
 419
 420         /* use the accessors defined below */
 421         unsigned long _flags;
 422
 423         /* STA powersave lock and frame queues */
 424         spinlock_t ps_lock;
 425         struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
 426         struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
 427         unsigned long driver_buffered_tids;
 428         unsigned long txq_buffered_tids;
 429
 430         long last_connected;
 431
 432         /* Updated from RX path only, no locking requirements */
 433         struct {
 434                 unsigned long packets;
 435                 u64 bytes;
 436                 unsigned long last_rx;
 437                 unsigned long num_duplicates;
 438                 unsigned long fragments;
 439                 unsigned long dropped;
 440                 int last_signal;
 441                 struct ewma_signal avg_signal;
 442                 u8 chains;
 443                 s8 chain_signal_last[IEEE80211_MAX_CHAINS];
 444                 struct ewma_signal chain_signal_avg[IEEE80211_MAX_CHAINS];
 445                 int last_rate_idx;
 446                 u32 last_rate_flag;
 447                 u32 last_rate_vht_flag;
 448                 u8 last_rate_vht_nss;
 449                 u64 msdu[IEEE80211_NUM_TIDS + 1];
 450         } rx_stats;
 451
 452         /* Plus 1 for non-QoS frames */
 453         __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
 454
 455         /* Updated from TX status path only, no locking requirements */
 456         struct {
 457                 unsigned long filtered;
 458                 unsigned long retry_failed, retry_count;
 459                 unsigned int lost_packets;
 460                 unsigned long last_tdls_pkt_time;
 461                 u64 msdu_retries[IEEE80211_NUM_TIDS + 1];
 462                 u64 msdu_failed[IEEE80211_NUM_TIDS + 1];
 463         } status_stats;
 464
 465         /* Updated from TX path only, no locking requirements */
 466         struct {
 467                 u64 packets[IEEE80211_NUM_ACS];
 468                 u64 bytes[IEEE80211_NUM_ACS];
 469                 struct ieee80211_tx_rate last_rate;
 470                 u64 msdu[IEEE80211_NUM_TIDS + 1];
 471         } tx_stats;
 472         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
 473
 474         /*
 475          * Aggregation information, locked with lock.
 476          */
 477         struct sta_ampdu_mlme ampdu_mlme;
 478         u8 timer_to_tid[IEEE80211_NUM_TIDS];
 479
 480 #ifdef CONFIG_MAC80211_DEBUGFS
 481         struct sta_info_debugfsdentries {
 482                 struct dentry *dir;
 483                 bool add_has_run;
 484         } debugfs;
 485 #endif
 486
 487         enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
 488
 489         enum ieee80211_smps_mode known_smps_mode;
 490         const struct ieee80211_cipher_scheme *cipher_scheme;
 491
 492         u8 reserved_tid;
 493
 494         struct cfg80211_chan_def tdls_chandef;
 495
 496         /* keep last! */
 497         struct ieee80211_sta sta;
 498 };
 499
 500 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
 501 {
 502 #ifdef CONFIG_MAC80211_MESH
 503         return sta->mesh->plink_state;
 504 #endif
 505         return NL80211_PLINK_LISTEN;
 506 }
 507
 508 static inline void set_sta_flag(struct sta_info *sta,
 509                                 enum ieee80211_sta_info_flags flag)
 510 {
 511         WARN_ON(flag == WLAN_STA_AUTH ||
 512                 flag == WLAN_STA_ASSOC ||
 513                 flag == WLAN_STA_AUTHORIZED);
 514         set_bit(flag, &sta->_flags);
 515 }
 516
 517 static inline void clear_sta_flag(struct sta_info *sta,
 518                                   enum ieee80211_sta_info_flags flag)
 519 {
 520         WARN_ON(flag == WLAN_STA_AUTH ||
 521                 flag == WLAN_STA_ASSOC ||
 522                 flag == WLAN_STA_AUTHORIZED);
 523         clear_bit(flag, &sta->_flags);
 524 }
 525
 526 static inline int test_sta_flag(struct sta_info *sta,
 527                                 enum ieee80211_sta_info_flags flag)
 528 {
 529         return test_bit(flag, &sta->_flags);
 530 }
 531
 532 static inline int test_and_clear_sta_flag(struct sta_info *sta,
 533                                           enum ieee80211_sta_info_flags flag)
 534 {
 535         WARN_ON(flag == WLAN_STA_AUTH ||
 536                 flag == WLAN_STA_ASSOC ||
 537                 flag == WLAN_STA_AUTHORIZED);
 538         return test_and_clear_bit(flag, &sta->_flags);
 539 }
 540
 541 static inline int test_and_set_sta_flag(struct sta_info *sta,
 542                                         enum ieee80211_sta_info_flags flag)
 543 {
 544         WARN_ON(flag == WLAN_STA_AUTH ||
 545                 flag == WLAN_STA_ASSOC ||
 546                 flag == WLAN_STA_AUTHORIZED);
 547         return test_and_set_bit(flag, &sta->_flags);
 548 }
 549
 550 int sta_info_move_state(struct sta_info *sta,
 551                         enum ieee80211_sta_state new_state);
 552
 553 static inline void sta_info_pre_move_state(struct sta_info *sta,
 554                                            enum ieee80211_sta_state new_state)
 555 {
 556         int ret;
 557
 558         WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
 559
 560         ret = sta_info_move_state(sta, new_state);
 561         WARN_ON_ONCE(ret);
 562 }
 563
 564
 565 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
 566                              struct tid_ampdu_tx *tid_tx);
 567
 568 static inline struct tid_ampdu_tx *
 569 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
 570 {
 571         return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
 572                                          lockdep_is_held(&sta->lock) ||
 573                                          lockdep_is_held(&sta->ampdu_mlme.mtx));
 574 }
 575
 576 /* Maximum number of frames to buffer per power saving station per AC */
 577 #define STA_MAX_TX_BUFFER       64
 578
 579 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 580  * smaller than this value, the minimum value here is used instead. */
 581 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 582
 583 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 584  */
 585 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 586
 587 /*
 588  * Get a STA info, must be under RCU read lock.
 589  */
 590 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
 591                               const u8 *addr);
 592
 593 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 594                                   const u8 *addr);
 595
 596 u32 sta_addr_hash(const void *key, u32 length, u32 seed);
 597
 598 #define _sta_bucket_idx(_tbl, _a)                                       \
 599         rht_bucket_index(_tbl, sta_addr_hash(_a, ETH_ALEN, (_tbl)->hash_rnd))
 600
 601 #define for_each_sta_info(local, tbl, _addr, _sta, _tmp)                \
 602         rht_for_each_entry_rcu(_sta, _tmp, tbl,                         \
 603                                _sta_bucket_idx(tbl, _addr),             \
 604                                hash_node)                               \
 605         /* compare address and run code only if it matches */           \
 606         if (ether_addr_equal(_sta->addr, (_addr)))
 607
 608 /*
 609  * Get STA info by index, BROKEN!
 610  */
 611 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 612                                      int idx);
 613 /*
 614  * Create a new STA info, caller owns returned structure
 615  * until sta_info_insert().
 616  */
 617 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 618                                 const u8 *addr, gfp_t gfp);
 619
 620 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
 621
 622 /*
 623  * Insert STA info into hash table/list, returns zero or a
 624  * -EEXIST if (if the same MAC address is already present).
 625  *
 626  * Calling the non-rcu version makes the caller relinquish,
 627  * the _rcu version calls read_lock_rcu() and must be called
 628  * without it held.
 629  */
 630 int sta_info_insert(struct sta_info *sta);
 631 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
 632
 633 int __must_check __sta_info_destroy(struct sta_info *sta);
 634 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
 635                           const u8 *addr);
 636 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
 637                               const u8 *addr);
 638
 639 void sta_info_recalc_tim(struct sta_info *sta);
 640
 641 int sta_info_init(struct ieee80211_local *local);
 642 void sta_info_stop(struct ieee80211_local *local);
 643
 644 /**
 645  * sta_info_flush - flush matching STA entries from the STA table
 646  *
 647  * Returns the number of removed STA entries.
 648  *
 649  * @sdata: sdata to remove all stations from
 650  * @vlans: if the given interface is an AP interface, also flush VLANs
 651  */
 652 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans);
 653
 654 static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
 655 {
 656         return __sta_info_flush(sdata, false);
 657 }
 658
 659 void sta_set_rate_info_tx(struct sta_info *sta,
 660                           const struct ieee80211_tx_rate *rate,
 661                           struct rate_info *rinfo);
 662 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo);
 663
 664 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 665                           unsigned long exp_time);
 666 u8 sta_info_tx_streams(struct sta_info *sta);
 667
 668 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
 669 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
 670 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
 671
 672 #endif /* STA_INFO_H */