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 "key.h"
  20
  21 /**
  22  * enum ieee80211_sta_info_flags - Stations flags
  23  *
  24  * These flags are used with &struct sta_info's @flags member, but
  25  * only indirectly with set_sta_flag() and friends.
  26  *
  27  * @WLAN_STA_AUTH: Station is authenticated.
  28  * @WLAN_STA_ASSOC: Station is associated.
  29  * @WLAN_STA_PS_STA: Station is in power-save mode
  30  * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
  31  *      This bit is always checked so needs to be enabled for all stations
  32  *      when virtual port control is not in use.
  33  * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
  34  *      frames.
  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_TDLS_INITIATOR: We are the initiator of the TDLS link with this
  51  *      station.
  52  * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
  53  *      keeping station in power-save mode, reply when the driver
  54  *      unblocks the station.
  55  * @WLAN_STA_SP: Station is in a service period, so don't try to
  56  *      reply to other uAPSD trigger frames or PS-Poll.
  57  * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
  58  * @WLAN_STA_INSERTED: This station is inserted into the hash table.
  59  * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
  60  * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
  61  * @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period.
  62  * @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP.
  63  * @WLAN_STA_PS_DELIVER: station woke up, but we're still blocking TX
  64  *      until pending frames are delivered
  65  */
  66 enum ieee80211_sta_info_flags {
  67         WLAN_STA_AUTH,
  68         WLAN_STA_ASSOC,
  69         WLAN_STA_PS_STA,
  70         WLAN_STA_AUTHORIZED,
  71         WLAN_STA_SHORT_PREAMBLE,
  72         WLAN_STA_WDS,
  73         WLAN_STA_CLEAR_PS_FILT,
  74         WLAN_STA_MFP,
  75         WLAN_STA_BLOCK_BA,
  76         WLAN_STA_PS_DRIVER,
  77         WLAN_STA_PSPOLL,
  78         WLAN_STA_TDLS_PEER,
  79         WLAN_STA_TDLS_PEER_AUTH,
  80         WLAN_STA_TDLS_INITIATOR,
  81         WLAN_STA_UAPSD,
  82         WLAN_STA_SP,
  83         WLAN_STA_4ADDR_EVENT,
  84         WLAN_STA_INSERTED,
  85         WLAN_STA_RATE_CONTROL,
  86         WLAN_STA_TOFFSET_KNOWN,
  87         WLAN_STA_MPSP_OWNER,
  88         WLAN_STA_MPSP_RECIPIENT,
  89         WLAN_STA_PS_DELIVER,
  90 };
  91
  92 #define ADDBA_RESP_INTERVAL HZ
  93 #define HT_AGG_MAX_RETRIES              15
  94 #define HT_AGG_BURST_RETRIES            3
  95 #define HT_AGG_RETRIES_PERIOD           (15 * HZ)
  96
  97 #define HT_AGG_STATE_DRV_READY          0
  98 #define HT_AGG_STATE_RESPONSE_RECEIVED  1
  99 #define HT_AGG_STATE_OPERATIONAL        2
 100 #define HT_AGG_STATE_STOPPING           3
 101 #define HT_AGG_STATE_WANT_START         4
 102 #define HT_AGG_STATE_WANT_STOP          5
 103
 104 enum ieee80211_agg_stop_reason {
 105         AGG_STOP_DECLINED,
 106         AGG_STOP_LOCAL_REQUEST,
 107         AGG_STOP_PEER_REQUEST,
 108         AGG_STOP_DESTROY_STA,
 109 };
 110
 111 /**
 112  * struct tid_ampdu_tx - TID aggregation information (Tx).
 113  *
 114  * @rcu_head: rcu head for freeing structure
 115  * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
 116  * @addba_resp_timer: timer for peer's response to addba request
 117  * @pending: pending frames queue -- use sta's spinlock to protect
 118  * @dialog_token: dialog token for aggregation session
 119  * @timeout: session timeout value to be filled in ADDBA requests
 120  * @state: session state (see above)
 121  * @last_tx: jiffies of last tx activity
 122  * @stop_initiator: initiator of a session stop
 123  * @tx_stop: TX DelBA frame when stopping
 124  * @buf_size: reorder buffer size at receiver
 125  * @failed_bar_ssn: ssn of the last failed BAR tx attempt
 126  * @bar_pending: BAR needs to be re-sent
 127  *
 128  * This structure's lifetime is managed by RCU, assignments to
 129  * the array holding it must hold the aggregation mutex.
 130  *
 131  * The TX path can access it under RCU lock-free if, and
 132  * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
 133  * set. Otherwise, the TX path must also acquire the spinlock
 134  * and re-check the state, see comments in the tx code
 135  * touching it.
 136  */
 137 struct tid_ampdu_tx {
 138         struct rcu_head rcu_head;
 139         struct timer_list session_timer;
 140         struct timer_list addba_resp_timer;
 141         struct sk_buff_head pending;
 142         unsigned long state;
 143         unsigned long last_tx;
 144         u16 timeout;
 145         u8 dialog_token;
 146         u8 stop_initiator;
 147         bool tx_stop;
 148         u8 buf_size;
 149
 150         u16 failed_bar_ssn;
 151         bool bar_pending;
 152 };
 153
 154 /**
 155  * struct tid_ampdu_rx - TID aggregation information (Rx).
 156  *
 157  * @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an
 158  *      A-MSDU with individually reported subframes.
 159  * @reorder_time: jiffies when skb was added
 160  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
 161  * @reorder_timer: releases expired frames from the reorder buffer.
 162  * @last_rx: jiffies of last rx activity
 163  * @head_seq_num: head sequence number in reordering buffer.
 164  * @stored_mpdu_num: number of MPDUs in reordering buffer
 165  * @ssn: Starting Sequence Number expected to be aggregated.
 166  * @buf_size: buffer size for incoming A-MPDUs
 167  * @timeout: reset timer value (in TUs).
 168  * @dialog_token: dialog token for aggregation session
 169  * @rcu_head: RCU head used for freeing this struct
 170  * @reorder_lock: serializes access to reorder buffer, see below.
 171  * @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and
 172  *      and ssn.
 173  *
 174  * This structure's lifetime is managed by RCU, assignments to
 175  * the array holding it must hold the aggregation mutex.
 176  *
 177  * The @reorder_lock is used to protect the members of this
 178  * struct, except for @timeout, @buf_size and @dialog_token,
 179  * which are constant across the lifetime of the struct (the
 180  * dialog token being used only for debugging).
 181  */
 182 struct tid_ampdu_rx {
 183         struct rcu_head rcu_head;
 184         spinlock_t reorder_lock;
 185         struct sk_buff_head *reorder_buf;
 186         unsigned long *reorder_time;
 187         struct timer_list session_timer;
 188         struct timer_list reorder_timer;
 189         unsigned long last_rx;
 190         u16 head_seq_num;
 191         u16 stored_mpdu_num;
 192         u16 ssn;
 193         u16 buf_size;
 194         u16 timeout;
 195         u8 dialog_token;
 196         bool auto_seq;
 197 };
 198
 199 /**
 200  * struct sta_ampdu_mlme - STA aggregation information.
 201  *
 202  * @tid_rx: aggregation info for Rx per TID -- RCU protected
 203  * @tid_tx: aggregation info for Tx per TID
 204  * @tid_start_tx: sessions where start was requested
 205  * @addba_req_num: number of times addBA request has been sent.
 206  * @last_addba_req_time: timestamp of the last addBA request.
 207  * @dialog_token_allocator: dialog token enumerator for each new session;
 208  * @work: work struct for starting/stopping aggregation
 209  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
 210  *      RX timer expired until the work for it runs
 211  * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
 212  *      driver requested to close until the work for it runs
 213  * @mtx: mutex to protect all TX data (except non-NULL assignments
 214  *      to tid_tx[idx], which are protected by the sta spinlock)
 215  *      tid_start_tx is also protected by sta->lock.
 216  */
 217 struct sta_ampdu_mlme {
 218         struct mutex mtx;
 219         /* rx */
 220         struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
 221         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 222         unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 223         /* tx */
 224         struct work_struct work;
 225         struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
 226         struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
 227         unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
 228         u8 addba_req_num[IEEE80211_NUM_TIDS];
 229         u8 dialog_token_allocator;
 230 };
 231
 232 /*
 233  * struct ieee80211_tx_latency_stat - Tx latency statistics
 234  *
 235  * Measures TX latency and jitter for a station per TID.
 236  *
 237  * @max: worst case latency
 238  * @sum: sum of all latencies
 239  * @counter: amount of Tx frames sent from interface
 240  * @bins: each bin counts how many frames transmitted within a certain
 241  * latency range. when disabled it is NULL.
 242  * @bin_count: amount of bins.
 243  */
 244 struct ieee80211_tx_latency_stat {
 245         u32 max;
 246         u32 sum;
 247         u32 counter;
 248         u32 *bins;
 249         u32 bin_count;
 250 };
 251
 252 /**
 253  * struct sta_info - STA information
 254  *
 255  * This structure collects information about a station that
 256  * mac80211 is communicating with.
 257  *
 258  * @list: global linked list entry
 259  * @free_list: list entry for keeping track of stations to free
 260  * @hnext: hash table linked list pointer
 261  * @local: pointer to the global information
 262  * @sdata: virtual interface this station belongs to
 263  * @ptk: peer keys negotiated with this station, if any
 264  * @ptk_idx: last installed peer key index
 265  * @gtk: group keys negotiated with this station, if any
 266  * @gtk_idx: last installed group key index
 267  * @rate_ctrl: rate control algorithm reference
 268  * @rate_ctrl_priv: rate control private per-STA pointer
 269  * @last_tx_rate: rate used for last transmit, to report to userspace as
 270  *      "the" transmit rate
 271  * @last_rx_rate_idx: rx status rate index of the last data packet
 272  * @last_rx_rate_flag: rx status flag of the last data packet
 273  * @last_rx_rate_vht_flag: rx status vht flag of the last data packet
 274  * @last_rx_rate_vht_nss: rx status nss of last data packet
 275  * @lock: used for locking all fields that require locking, see comments
 276  *      in the header file.
 277  * @drv_deliver_wk: used for delivering frames after driver PS unblocking
 278  * @listen_interval: listen interval of this station, when we're acting as AP
 279  * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
 280  * @ps_lock: used for powersave (when mac80211 is the AP) related locking
 281  * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
 282  *      when it leaves power saving state or polls
 283  * @tx_filtered: buffers (per AC) of frames we already tried to
 284  *      transmit but were filtered by hardware due to STA having
 285  *      entered power saving state, these are also delivered to
 286  *      the station when it leaves powersave or polls for frames
 287  * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
 288  * @rx_packets: Number of MSDUs received from this STA
 289  * @rx_bytes: Number of bytes received from this STA
 290  * @last_rx: time (in jiffies) when last frame was received from this STA
 291  * @last_connected: time (in seconds) when a station got connected
 292  * @num_duplicates: number of duplicate frames received from this STA
 293  * @rx_fragments: number of received MPDUs
 294  * @rx_dropped: number of dropped MPDUs from this STA
 295  * @last_signal: signal of last received frame from this STA
 296  * @avg_signal: moving average of signal of received frames from this STA
 297  * @last_ack_signal: signal of last received Ack frame from this STA
 298  * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
 299  * @tx_filtered_count: number of frames the hardware filtered for this STA
 300  * @tx_retry_failed: number of frames that failed retry
 301  * @tx_retry_count: total number of retries for frames to this STA
 302  * @fail_avg: moving percentage of failed MSDUs
 303  * @tx_packets: number of RX/TX MSDUs
 304  * @tx_bytes: number of bytes transmitted to this STA
 305  * @tx_fragments: number of transmitted MPDUs
 306  * @tid_seq: per-TID sequence numbers for sending to this STA
 307  * @ampdu_mlme: A-MPDU state machine state
 308  * @timer_to_tid: identity mapping to ID timers
 309  * @tx_lat: Tx latency statistics
 310  * @llid: Local link ID
 311  * @plid: Peer link ID
 312  * @reason: Cancel reason on PLINK_HOLDING state
 313  * @plink_retries: Retries in establishment
 314  * @plink_state: peer link state
 315  * @plink_timeout: timeout of peer link
 316  * @plink_timer: peer link watch timer
 317  * @t_offset: timing offset relative to this host
 318  * @t_offset_setpoint: reference timing offset of this sta to be used when
 319  *      calculating clockdrift
 320  * @local_pm: local link-specific power save mode
 321  * @peer_pm: peer-specific power save mode towards local STA
 322  * @nonpeer_pm: STA power save mode towards non-peer neighbors
 323  * @debugfs: debug filesystem info
 324  * @dead: set to true when sta is unlinked
 325  * @uploaded: set to true when sta is uploaded to the driver
 326  * @lost_packets: number of consecutive lost packets
 327  * @sta: station information we share with the driver
 328  * @sta_state: duplicates information about station state (for debug)
 329  * @beacon_loss_count: number of times beacon loss has triggered
 330  * @rcu_head: RCU head used for freeing this station struct
 331  * @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
 332  *      taken from HT/VHT capabilities or VHT operating mode notification
 333  * @chains: chains ever used for RX from this station
 334  * @chain_signal_last: last signal (per chain)
 335  * @chain_signal_avg: signal average (per chain)
 336  * @known_smps_mode: the smps_mode the client thinks we are in. Relevant for
 337  *      AP only.
 338  * @cipher_scheme: optional cipher scheme for this station
 339  */
 340 struct sta_info {
 341         /* General information, mostly static */
 342         struct list_head list, free_list;
 343         struct rcu_head rcu_head;
 344         struct sta_info __rcu *hnext;
 345         struct ieee80211_local *local;
 346         struct ieee80211_sub_if_data *sdata;
 347         struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
 348         struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS];
 349         u8 gtk_idx;
 350         u8 ptk_idx;
 351         struct rate_control_ref *rate_ctrl;
 352         void *rate_ctrl_priv;
 353         spinlock_t lock;
 354
 355         struct work_struct drv_deliver_wk;
 356
 357         u16 listen_interval;
 358
 359         bool dead;
 360
 361         bool uploaded;
 362
 363         enum ieee80211_sta_state sta_state;
 364
 365         /* use the accessors defined below */
 366         unsigned long _flags;
 367
 368         /* STA powersave lock and frame queues */
 369         spinlock_t ps_lock;
 370         struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
 371         struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
 372         unsigned long driver_buffered_tids;
 373
 374         /* Updated from RX path only, no locking requirements */
 375         unsigned long rx_packets;
 376         u64 rx_bytes;
 377         unsigned long last_rx;
 378         long last_connected;
 379         unsigned long num_duplicates;
 380         unsigned long rx_fragments;
 381         unsigned long rx_dropped;
 382         int last_signal;
 383         struct ewma avg_signal;
 384         int last_ack_signal;
 385
 386         u8 chains;
 387         s8 chain_signal_last[IEEE80211_MAX_CHAINS];
 388         struct ewma chain_signal_avg[IEEE80211_MAX_CHAINS];
 389
 390         /* Plus 1 for non-QoS frames */
 391         __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
 392
 393         /* Updated from TX status path only, no locking requirements */
 394         unsigned long tx_filtered_count;
 395         unsigned long tx_retry_failed, tx_retry_count;
 396         /* moving percentage of failed MSDUs */
 397         unsigned int fail_avg;
 398
 399         /* Updated from TX path only, no locking requirements */
 400         u32 tx_fragments;
 401         u64 tx_packets[IEEE80211_NUM_ACS];
 402         u64 tx_bytes[IEEE80211_NUM_ACS];
 403         struct ieee80211_tx_rate last_tx_rate;
 404         int last_rx_rate_idx;
 405         u32 last_rx_rate_flag;
 406         u32 last_rx_rate_vht_flag;
 407         u8 last_rx_rate_vht_nss;
 408         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
 409
 410         /*
 411          * Aggregation information, locked with lock.
 412          */
 413         struct sta_ampdu_mlme ampdu_mlme;
 414         u8 timer_to_tid[IEEE80211_NUM_TIDS];
 415
 416         struct ieee80211_tx_latency_stat *tx_lat;
 417
 418 #ifdef CONFIG_MAC80211_MESH
 419         /*
 420          * Mesh peer link attributes
 421          * TODO: move to a sub-structure that is referenced with pointer?
 422          */
 423         u16 llid;
 424         u16 plid;
 425         u16 reason;
 426         u8 plink_retries;
 427         enum nl80211_plink_state plink_state;
 428         u32 plink_timeout;
 429         struct timer_list plink_timer;
 430         s64 t_offset;
 431         s64 t_offset_setpoint;
 432         /* mesh power save */
 433         enum nl80211_mesh_power_mode local_pm;
 434         enum nl80211_mesh_power_mode peer_pm;
 435         enum nl80211_mesh_power_mode nonpeer_pm;
 436 #endif
 437
 438 #ifdef CONFIG_MAC80211_DEBUGFS
 439         struct sta_info_debugfsdentries {
 440                 struct dentry *dir;
 441                 bool add_has_run;
 442         } debugfs;
 443 #endif
 444
 445         enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
 446
 447         unsigned int lost_packets;
 448         unsigned int beacon_loss_count;
 449
 450         enum ieee80211_smps_mode known_smps_mode;
 451         const struct ieee80211_cipher_scheme *cipher_scheme;
 452
 453         /* TDLS timeout data */
 454         unsigned long last_tdls_pkt_time;
 455
 456         /* keep last! */
 457         struct ieee80211_sta sta;
 458 };
 459
 460 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
 461 {
 462 #ifdef CONFIG_MAC80211_MESH
 463         return sta->plink_state;
 464 #endif
 465         return NL80211_PLINK_LISTEN;
 466 }
 467
 468 static inline void set_sta_flag(struct sta_info *sta,
 469                                 enum ieee80211_sta_info_flags flag)
 470 {
 471         WARN_ON(flag == WLAN_STA_AUTH ||
 472                 flag == WLAN_STA_ASSOC ||
 473                 flag == WLAN_STA_AUTHORIZED);
 474         set_bit(flag, &sta->_flags);
 475 }
 476
 477 static inline void clear_sta_flag(struct sta_info *sta,
 478                                   enum ieee80211_sta_info_flags flag)
 479 {
 480         WARN_ON(flag == WLAN_STA_AUTH ||
 481                 flag == WLAN_STA_ASSOC ||
 482                 flag == WLAN_STA_AUTHORIZED);
 483         clear_bit(flag, &sta->_flags);
 484 }
 485
 486 static inline int test_sta_flag(struct sta_info *sta,
 487                                 enum ieee80211_sta_info_flags flag)
 488 {
 489         return test_bit(flag, &sta->_flags);
 490 }
 491
 492 static inline int test_and_clear_sta_flag(struct sta_info *sta,
 493                                           enum ieee80211_sta_info_flags flag)
 494 {
 495         WARN_ON(flag == WLAN_STA_AUTH ||
 496                 flag == WLAN_STA_ASSOC ||
 497                 flag == WLAN_STA_AUTHORIZED);
 498         return test_and_clear_bit(flag, &sta->_flags);
 499 }
 500
 501 static inline int test_and_set_sta_flag(struct sta_info *sta,
 502                                         enum ieee80211_sta_info_flags flag)
 503 {
 504         WARN_ON(flag == WLAN_STA_AUTH ||
 505                 flag == WLAN_STA_ASSOC ||
 506                 flag == WLAN_STA_AUTHORIZED);
 507         return test_and_set_bit(flag, &sta->_flags);
 508 }
 509
 510 int sta_info_move_state(struct sta_info *sta,
 511                         enum ieee80211_sta_state new_state);
 512
 513 static inline void sta_info_pre_move_state(struct sta_info *sta,
 514                                            enum ieee80211_sta_state new_state)
 515 {
 516         int ret;
 517
 518         WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
 519
 520         ret = sta_info_move_state(sta, new_state);
 521         WARN_ON_ONCE(ret);
 522 }
 523
 524
 525 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
 526                              struct tid_ampdu_tx *tid_tx);
 527
 528 static inline struct tid_ampdu_tx *
 529 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
 530 {
 531         return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
 532                                          lockdep_is_held(&sta->lock) ||
 533                                          lockdep_is_held(&sta->ampdu_mlme.mtx));
 534 }
 535
 536 #define STA_HASH_SIZE 256
 537 #define STA_HASH(sta) (sta[5])
 538
 539
 540 /* Maximum number of frames to buffer per power saving station per AC */
 541 #define STA_MAX_TX_BUFFER       64
 542
 543 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 544  * smaller than this value, the minimum value here is used instead. */
 545 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 546
 547 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 548  */
 549 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 550
 551 /*
 552  * Get a STA info, must be under RCU read lock.
 553  */
 554 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
 555                               const u8 *addr);
 556
 557 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 558                                   const u8 *addr);
 559
 560 static inline
 561 void for_each_sta_info_type_check(struct ieee80211_local *local,
 562                                   const u8 *addr,
 563                                   struct sta_info *sta,
 564                                   struct sta_info *nxt)
 565 {
 566 }
 567
 568 #define for_each_sta_info(local, _addr, _sta, nxt)                      \
 569         for (   /* initialise loop */                                   \
 570                 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
 571                 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL;       \
 572                 /* typecheck */                                         \
 573                 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
 574                 /* continue condition */                                \
 575                 _sta;                                                   \
 576                 /* advance loop */                                      \
 577                 _sta = nxt,                                             \
 578                 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL        \
 579              )                                                          \
 580         /* compare address and run code only if it matches */           \
 581         if (ether_addr_equal(_sta->sta.addr, (_addr)))
 582
 583 /*
 584  * Get STA info by index, BROKEN!
 585  */
 586 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 587                                      int idx);
 588 /*
 589  * Create a new STA info, caller owns returned structure
 590  * until sta_info_insert().
 591  */
 592 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 593                                 const u8 *addr, gfp_t gfp);
 594
 595 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
 596
 597 /*
 598  * Insert STA info into hash table/list, returns zero or a
 599  * -EEXIST if (if the same MAC address is already present).
 600  *
 601  * Calling the non-rcu version makes the caller relinquish,
 602  * the _rcu version calls read_lock_rcu() and must be called
 603  * without it held.
 604  */
 605 int sta_info_insert(struct sta_info *sta);
 606 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
 607
 608 int __must_check __sta_info_destroy(struct sta_info *sta);
 609 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
 610                           const u8 *addr);
 611 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
 612                               const u8 *addr);
 613
 614 void sta_info_recalc_tim(struct sta_info *sta);
 615
 616 void sta_info_init(struct ieee80211_local *local);
 617 void sta_info_stop(struct ieee80211_local *local);
 618
 619 /**
 620  * sta_info_flush - flush matching STA entries from the STA table
 621  *
 622  * Returns the number of removed STA entries.
 623  *
 624  * @sdata: sdata to remove all stations from
 625  * @vlans: if the given interface is an AP interface, also flush VLANs
 626  */
 627 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans);
 628
 629 static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
 630 {
 631         return __sta_info_flush(sdata, false);
 632 }
 633
 634 void sta_set_rate_info_tx(struct sta_info *sta,
 635                           const struct ieee80211_tx_rate *rate,
 636                           struct rate_info *rinfo);
 637 void sta_set_rate_info_rx(struct sta_info *sta,
 638                           struct rate_info *rinfo);
 639 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo);
 640
 641 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 642                           unsigned long exp_time);
 643 u8 sta_info_tx_streams(struct sta_info *sta);
 644
 645 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
 646 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
 647 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
 648
 649 #endif /* STA_INFO_H */