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_TDLS_CHAN_SWITCH: This TDLS peer supports TDLS channel-switching 53 * @WLAN_STA_TDLS_OFF_CHANNEL: The local STA is currently off-channel with this 54 * TDLS peer 55 * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was 56 * keeping station in power-save mode, reply when the driver 57 * unblocks the station. 58 * @WLAN_STA_SP: Station is in a service period, so don't try to 59 * reply to other uAPSD trigger frames or PS-Poll. 60 * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame. 61 * @WLAN_STA_INSERTED: This station is inserted into the hash table. 62 * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station. 63 * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid. 64 * @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period. 65 * @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP. 66 * @WLAN_STA_PS_DELIVER: station woke up, but we're still blocking TX 67 * until pending frames are delivered 68 */ 69 enum ieee80211_sta_info_flags { 70 WLAN_STA_AUTH, 71 WLAN_STA_ASSOC, 72 WLAN_STA_PS_STA, 73 WLAN_STA_AUTHORIZED, 74 WLAN_STA_SHORT_PREAMBLE, 75 WLAN_STA_WDS, 76 WLAN_STA_CLEAR_PS_FILT, 77 WLAN_STA_MFP, 78 WLAN_STA_BLOCK_BA, 79 WLAN_STA_PS_DRIVER, 80 WLAN_STA_PSPOLL, 81 WLAN_STA_TDLS_PEER, 82 WLAN_STA_TDLS_PEER_AUTH, 83 WLAN_STA_TDLS_INITIATOR, 84 WLAN_STA_TDLS_CHAN_SWITCH, 85 WLAN_STA_TDLS_OFF_CHANNEL, 86 WLAN_STA_UAPSD, 87 WLAN_STA_SP, 88 WLAN_STA_4ADDR_EVENT, 89 WLAN_STA_INSERTED, 90 WLAN_STA_RATE_CONTROL, 91 WLAN_STA_TOFFSET_KNOWN, 92 WLAN_STA_MPSP_OWNER, 93 WLAN_STA_MPSP_RECIPIENT, 94 WLAN_STA_PS_DELIVER, 95 }; 96 97 #define ADDBA_RESP_INTERVAL HZ 98 #define HT_AGG_MAX_RETRIES 15 99 #define HT_AGG_BURST_RETRIES 3 100 #define HT_AGG_RETRIES_PERIOD (15 * HZ) 101 102 #define HT_AGG_STATE_DRV_READY 0 103 #define HT_AGG_STATE_RESPONSE_RECEIVED 1 104 #define HT_AGG_STATE_OPERATIONAL 2 105 #define HT_AGG_STATE_STOPPING 3 106 #define HT_AGG_STATE_WANT_START 4 107 #define HT_AGG_STATE_WANT_STOP 5 108 109 enum ieee80211_agg_stop_reason { 110 AGG_STOP_DECLINED, 111 AGG_STOP_LOCAL_REQUEST, 112 AGG_STOP_PEER_REQUEST, 113 AGG_STOP_DESTROY_STA, 114 }; 115 116 /** 117 * struct tid_ampdu_tx - TID aggregation information (Tx). 118 * 119 * @rcu_head: rcu head for freeing structure 120 * @session_timer: check if we keep Tx-ing on the TID (by timeout value) 121 * @addba_resp_timer: timer for peer's response to addba request 122 * @pending: pending frames queue -- use sta's spinlock to protect 123 * @dialog_token: dialog token for aggregation session 124 * @timeout: session timeout value to be filled in ADDBA requests 125 * @state: session state (see above) 126 * @last_tx: jiffies of last tx activity 127 * @stop_initiator: initiator of a session stop 128 * @tx_stop: TX DelBA frame when stopping 129 * @buf_size: reorder buffer size at receiver 130 * @failed_bar_ssn: ssn of the last failed BAR tx attempt 131 * @bar_pending: BAR needs to be re-sent 132 * 133 * This structure's lifetime is managed by RCU, assignments to 134 * the array holding it must hold the aggregation mutex. 135 * 136 * The TX path can access it under RCU lock-free if, and 137 * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL 138 * set. Otherwise, the TX path must also acquire the spinlock 139 * and re-check the state, see comments in the tx code 140 * touching it. 141 */ 142 struct tid_ampdu_tx { 143 struct rcu_head rcu_head; 144 struct timer_list session_timer; 145 struct timer_list addba_resp_timer; 146 struct sk_buff_head pending; 147 unsigned long state; 148 unsigned long last_tx; 149 u16 timeout; 150 u8 dialog_token; 151 u8 stop_initiator; 152 bool tx_stop; 153 u8 buf_size; 154 155 u16 failed_bar_ssn; 156 bool bar_pending; 157 }; 158 159 /** 160 * struct tid_ampdu_rx - TID aggregation information (Rx). 161 * 162 * @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an 163 * A-MSDU with individually reported subframes. 164 * @reorder_time: jiffies when skb was added 165 * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value) 166 * @reorder_timer: releases expired frames from the reorder buffer. 167 * @last_rx: jiffies of last rx activity 168 * @head_seq_num: head sequence number in reordering buffer. 169 * @stored_mpdu_num: number of MPDUs in reordering buffer 170 * @ssn: Starting Sequence Number expected to be aggregated. 171 * @buf_size: buffer size for incoming A-MPDUs 172 * @timeout: reset timer value (in TUs). 173 * @dialog_token: dialog token for aggregation session 174 * @rcu_head: RCU head used for freeing this struct 175 * @reorder_lock: serializes access to reorder buffer, see below. 176 * @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and 177 * and ssn. 178 * 179 * This structure's lifetime is managed by RCU, assignments to 180 * the array holding it must hold the aggregation mutex. 181 * 182 * The @reorder_lock is used to protect the members of this 183 * struct, except for @timeout, @buf_size and @dialog_token, 184 * which are constant across the lifetime of the struct (the 185 * dialog token being used only for debugging). 186 */ 187 struct tid_ampdu_rx { 188 struct rcu_head rcu_head; 189 spinlock_t reorder_lock; 190 struct sk_buff_head *reorder_buf; 191 unsigned long *reorder_time; 192 struct timer_list session_timer; 193 struct timer_list reorder_timer; 194 unsigned long last_rx; 195 u16 head_seq_num; 196 u16 stored_mpdu_num; 197 u16 ssn; 198 u16 buf_size; 199 u16 timeout; 200 u8 dialog_token; 201 bool auto_seq; 202 }; 203 204 /** 205 * struct sta_ampdu_mlme - STA aggregation information. 206 * 207 * @tid_rx: aggregation info for Rx per TID -- RCU protected 208 * @tid_tx: aggregation info for Tx per TID 209 * @tid_start_tx: sessions where start was requested 210 * @addba_req_num: number of times addBA request has been sent. 211 * @last_addba_req_time: timestamp of the last addBA request. 212 * @dialog_token_allocator: dialog token enumerator for each new session; 213 * @work: work struct for starting/stopping aggregation 214 * @tid_rx_timer_expired: bitmap indicating on which TIDs the 215 * RX timer expired until the work for it runs 216 * @tid_rx_stop_requested: bitmap indicating which BA sessions per TID the 217 * driver requested to close until the work for it runs 218 * @mtx: mutex to protect all TX data (except non-NULL assignments 219 * to tid_tx[idx], which are protected by the sta spinlock) 220 * tid_start_tx is also protected by sta->lock. 221 */ 222 struct sta_ampdu_mlme { 223 struct mutex mtx; 224 /* rx */ 225 struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS]; 226 unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)]; 227 unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)]; 228 /* tx */ 229 struct work_struct work; 230 struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS]; 231 struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS]; 232 unsigned long last_addba_req_time[IEEE80211_NUM_TIDS]; 233 u8 addba_req_num[IEEE80211_NUM_TIDS]; 234 u8 dialog_token_allocator; 235 }; 236 237 /* 238 * struct ieee80211_tx_latency_stat - Tx latency statistics 239 * 240 * Measures TX latency and jitter for a station per TID. 241 * 242 * @max: worst case latency 243 * @sum: sum of all latencies 244 * @counter: amount of Tx frames sent from interface 245 * @bins: each bin counts how many frames transmitted within a certain 246 * latency range. when disabled it is NULL. 247 * @bin_count: amount of bins. 248 */ 249 struct ieee80211_tx_latency_stat { 250 u32 max; 251 u32 sum; 252 u32 counter; 253 u32 *bins; 254 u32 bin_count; 255 }; 256 257 /* Value to indicate no TID reservation */ 258 #define IEEE80211_TID_UNRESERVED 0xff 259 260 /** 261 * struct sta_info - STA information 262 * 263 * This structure collects information about a station that 264 * mac80211 is communicating with. 265 * 266 * @list: global linked list entry 267 * @free_list: list entry for keeping track of stations to free 268 * @hnext: hash table linked list pointer 269 * @local: pointer to the global information 270 * @sdata: virtual interface this station belongs to 271 * @ptk: peer keys negotiated with this station, if any 272 * @ptk_idx: last installed peer key index 273 * @gtk: group keys negotiated with this station, if any 274 * @gtk_idx: last installed group key index 275 * @rate_ctrl: rate control algorithm reference 276 * @rate_ctrl_priv: rate control private per-STA pointer 277 * @last_tx_rate: rate used for last transmit, to report to userspace as 278 * "the" transmit rate 279 * @last_rx_rate_idx: rx status rate index of the last data packet 280 * @last_rx_rate_flag: rx status flag of the last data packet 281 * @last_rx_rate_vht_flag: rx status vht flag of the last data packet 282 * @last_rx_rate_vht_nss: rx status nss of last data packet 283 * @lock: used for locking all fields that require locking, see comments 284 * in the header file. 285 * @drv_deliver_wk: used for delivering frames after driver PS unblocking 286 * @listen_interval: listen interval of this station, when we're acting as AP 287 * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly 288 * @ps_lock: used for powersave (when mac80211 is the AP) related locking 289 * @ps_tx_buf: buffers (per AC) of frames to transmit to this station 290 * when it leaves power saving state or polls 291 * @tx_filtered: buffers (per AC) of frames we already tried to 292 * transmit but were filtered by hardware due to STA having 293 * entered power saving state, these are also delivered to 294 * the station when it leaves powersave or polls for frames 295 * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on 296 * @rx_packets: Number of MSDUs received from this STA 297 * @rx_bytes: Number of bytes received from this STA 298 * @last_rx: time (in jiffies) when last frame was received from this STA 299 * @last_connected: time (in seconds) when a station got connected 300 * @num_duplicates: number of duplicate frames received from this STA 301 * @rx_fragments: number of received MPDUs 302 * @rx_dropped: number of dropped MPDUs from this STA 303 * @last_signal: signal of last received frame from this STA 304 * @avg_signal: moving average of signal of received frames from this STA 305 * @last_ack_signal: signal of last received Ack frame from this STA 306 * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue) 307 * @tx_filtered_count: number of frames the hardware filtered for this STA 308 * @tx_retry_failed: number of frames that failed retry 309 * @tx_retry_count: total number of retries for frames to this STA 310 * @fail_avg: moving percentage of failed MSDUs 311 * @tx_packets: number of RX/TX MSDUs 312 * @tx_bytes: number of bytes transmitted to this STA 313 * @tx_fragments: number of transmitted MPDUs 314 * @tid_seq: per-TID sequence numbers for sending to this STA 315 * @ampdu_mlme: A-MPDU state machine state 316 * @timer_to_tid: identity mapping to ID timers 317 * @tx_lat: Tx latency statistics 318 * @llid: Local link ID 319 * @plid: Peer link ID 320 * @reason: Cancel reason on PLINK_HOLDING state 321 * @plink_retries: Retries in establishment 322 * @plink_state: peer link state 323 * @plink_timeout: timeout of peer link 324 * @plink_timer: peer link watch timer 325 * @t_offset: timing offset relative to this host 326 * @t_offset_setpoint: reference timing offset of this sta to be used when 327 * calculating clockdrift 328 * @local_pm: local link-specific power save mode 329 * @peer_pm: peer-specific power save mode towards local STA 330 * @nonpeer_pm: STA power save mode towards non-peer neighbors 331 * @debugfs: debug filesystem info 332 * @dead: set to true when sta is unlinked 333 * @uploaded: set to true when sta is uploaded to the driver 334 * @lost_packets: number of consecutive lost packets 335 * @sta: station information we share with the driver 336 * @sta_state: duplicates information about station state (for debug) 337 * @beacon_loss_count: number of times beacon loss has triggered 338 * @rcu_head: RCU head used for freeing this station struct 339 * @cur_max_bandwidth: maximum bandwidth to use for TX to the station, 340 * taken from HT/VHT capabilities or VHT operating mode notification 341 * @chains: chains ever used for RX from this station 342 * @chain_signal_last: last signal (per chain) 343 * @chain_signal_avg: signal average (per chain) 344 * @known_smps_mode: the smps_mode the client thinks we are in. Relevant for 345 * AP only. 346 * @cipher_scheme: optional cipher scheme for this station 347 * @last_tdls_pkt_time: holds the time in jiffies of last TDLS pkt ACKed 348 * @reserved_tid: reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED) 349 */ 350 struct sta_info { 351 /* General information, mostly static */ 352 struct list_head list, free_list; 353 struct rcu_head rcu_head; 354 struct sta_info __rcu *hnext; 355 struct ieee80211_local *local; 356 struct ieee80211_sub_if_data *sdata; 357 struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS]; 358 struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS]; 359 u8 gtk_idx; 360 u8 ptk_idx; 361 struct rate_control_ref *rate_ctrl; 362 void *rate_ctrl_priv; 363 spinlock_t lock; 364 365 struct work_struct drv_deliver_wk; 366 367 u16 listen_interval; 368 369 bool dead; 370 371 bool uploaded; 372 373 enum ieee80211_sta_state sta_state; 374 375 /* use the accessors defined below */ 376 unsigned long _flags; 377 378 /* STA powersave lock and frame queues */ 379 spinlock_t ps_lock; 380 struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS]; 381 struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS]; 382 unsigned long driver_buffered_tids; 383 384 /* Updated from RX path only, no locking requirements */ 385 unsigned long rx_packets; 386 u64 rx_bytes; 387 unsigned long last_rx; 388 long last_connected; 389 unsigned long num_duplicates; 390 unsigned long rx_fragments; 391 unsigned long rx_dropped; 392 int last_signal; 393 struct ewma avg_signal; 394 int last_ack_signal; 395 396 u8 chains; 397 s8 chain_signal_last[IEEE80211_MAX_CHAINS]; 398 struct ewma chain_signal_avg[IEEE80211_MAX_CHAINS]; 399 400 /* Plus 1 for non-QoS frames */ 401 __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1]; 402 403 /* Updated from TX status path only, no locking requirements */ 404 unsigned long tx_filtered_count; 405 unsigned long tx_retry_failed, tx_retry_count; 406 /* moving percentage of failed MSDUs */ 407 unsigned int fail_avg; 408 409 /* Updated from TX path only, no locking requirements */ 410 u32 tx_fragments; 411 u64 tx_packets[IEEE80211_NUM_ACS]; 412 u64 tx_bytes[IEEE80211_NUM_ACS]; 413 struct ieee80211_tx_rate last_tx_rate; 414 int last_rx_rate_idx; 415 u32 last_rx_rate_flag; 416 u32 last_rx_rate_vht_flag; 417 u8 last_rx_rate_vht_nss; 418 u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1]; 419 420 /* 421 * Aggregation information, locked with lock. 422 */ 423 struct sta_ampdu_mlme ampdu_mlme; 424 u8 timer_to_tid[IEEE80211_NUM_TIDS]; 425 426 struct ieee80211_tx_latency_stat *tx_lat; 427 428 #ifdef CONFIG_MAC80211_MESH 429 /* 430 * Mesh peer link attributes 431 * TODO: move to a sub-structure that is referenced with pointer? 432 */ 433 u16 llid; 434 u16 plid; 435 u16 reason; 436 u8 plink_retries; 437 enum nl80211_plink_state plink_state; 438 u32 plink_timeout; 439 struct timer_list plink_timer; 440 s64 t_offset; 441 s64 t_offset_setpoint; 442 /* mesh power save */ 443 enum nl80211_mesh_power_mode local_pm; 444 enum nl80211_mesh_power_mode peer_pm; 445 enum nl80211_mesh_power_mode nonpeer_pm; 446 #endif 447 448 #ifdef CONFIG_MAC80211_DEBUGFS 449 struct sta_info_debugfsdentries { 450 struct dentry *dir; 451 bool add_has_run; 452 } debugfs; 453 #endif 454 455 enum ieee80211_sta_rx_bandwidth cur_max_bandwidth; 456 457 unsigned int lost_packets; 458 unsigned int beacon_loss_count; 459 460 enum ieee80211_smps_mode known_smps_mode; 461 const struct ieee80211_cipher_scheme *cipher_scheme; 462 463 /* TDLS timeout data */ 464 unsigned long last_tdls_pkt_time; 465 466 u8 reserved_tid; 467 468 /* keep last! */ 469 struct ieee80211_sta sta; 470 }; 471 472 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta) 473 { 474 #ifdef CONFIG_MAC80211_MESH 475 return sta->plink_state; 476 #endif 477 return NL80211_PLINK_LISTEN; 478 } 479 480 static inline void set_sta_flag(struct sta_info *sta, 481 enum ieee80211_sta_info_flags flag) 482 { 483 WARN_ON(flag == WLAN_STA_AUTH || 484 flag == WLAN_STA_ASSOC || 485 flag == WLAN_STA_AUTHORIZED); 486 set_bit(flag, &sta->_flags); 487 } 488 489 static inline void clear_sta_flag(struct sta_info *sta, 490 enum ieee80211_sta_info_flags flag) 491 { 492 WARN_ON(flag == WLAN_STA_AUTH || 493 flag == WLAN_STA_ASSOC || 494 flag == WLAN_STA_AUTHORIZED); 495 clear_bit(flag, &sta->_flags); 496 } 497 498 static inline int test_sta_flag(struct sta_info *sta, 499 enum ieee80211_sta_info_flags flag) 500 { 501 return test_bit(flag, &sta->_flags); 502 } 503 504 static inline int test_and_clear_sta_flag(struct sta_info *sta, 505 enum ieee80211_sta_info_flags flag) 506 { 507 WARN_ON(flag == WLAN_STA_AUTH || 508 flag == WLAN_STA_ASSOC || 509 flag == WLAN_STA_AUTHORIZED); 510 return test_and_clear_bit(flag, &sta->_flags); 511 } 512 513 static inline int test_and_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 return test_and_set_bit(flag, &sta->_flags); 520 } 521 522 int sta_info_move_state(struct sta_info *sta, 523 enum ieee80211_sta_state new_state); 524 525 static inline void sta_info_pre_move_state(struct sta_info *sta, 526 enum ieee80211_sta_state new_state) 527 { 528 int ret; 529 530 WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED)); 531 532 ret = sta_info_move_state(sta, new_state); 533 WARN_ON_ONCE(ret); 534 } 535 536 537 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, 538 struct tid_ampdu_tx *tid_tx); 539 540 static inline struct tid_ampdu_tx * 541 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid) 542 { 543 return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid], 544 lockdep_is_held(&sta->lock) || 545 lockdep_is_held(&sta->ampdu_mlme.mtx)); 546 } 547 548 #define STA_HASH_SIZE 256 549 #define STA_HASH(sta) (sta[5]) 550 551 552 /* Maximum number of frames to buffer per power saving station per AC */ 553 #define STA_MAX_TX_BUFFER 64 554 555 /* Minimum buffered frame expiry time. If STA uses listen interval that is 556 * smaller than this value, the minimum value here is used instead. */ 557 #define STA_TX_BUFFER_EXPIRE (10 * HZ) 558 559 /* How often station data is cleaned up (e.g., expiration of buffered frames) 560 */ 561 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ) 562 563 /* 564 * Get a STA info, must be under RCU read lock. 565 */ 566 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, 567 const u8 *addr); 568 569 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, 570 const u8 *addr); 571 572 static inline 573 void for_each_sta_info_type_check(struct ieee80211_local *local, 574 const u8 *addr, 575 struct sta_info *sta, 576 struct sta_info *nxt) 577 { 578 } 579 580 #define for_each_sta_info(local, _addr, _sta, nxt) \ 581 for ( /* initialise loop */ \ 582 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\ 583 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \ 584 /* typecheck */ \ 585 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\ 586 /* continue condition */ \ 587 _sta; \ 588 /* advance loop */ \ 589 _sta = nxt, \ 590 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \ 591 ) \ 592 /* compare address and run code only if it matches */ \ 593 if (ether_addr_equal(_sta->sta.addr, (_addr))) 594 595 /* 596 * Get STA info by index, BROKEN! 597 */ 598 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, 599 int idx); 600 /* 601 * Create a new STA info, caller owns returned structure 602 * until sta_info_insert(). 603 */ 604 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, 605 const u8 *addr, gfp_t gfp); 606 607 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta); 608 609 /* 610 * Insert STA info into hash table/list, returns zero or a 611 * -EEXIST if (if the same MAC address is already present). 612 * 613 * Calling the non-rcu version makes the caller relinquish, 614 * the _rcu version calls read_lock_rcu() and must be called 615 * without it held. 616 */ 617 int sta_info_insert(struct sta_info *sta); 618 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU); 619 620 int __must_check __sta_info_destroy(struct sta_info *sta); 621 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, 622 const u8 *addr); 623 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, 624 const u8 *addr); 625 626 void sta_info_recalc_tim(struct sta_info *sta); 627 628 void sta_info_init(struct ieee80211_local *local); 629 void sta_info_stop(struct ieee80211_local *local); 630 631 /** 632 * sta_info_flush - flush matching STA entries from the STA table 633 * 634 * Returns the number of removed STA entries. 635 * 636 * @sdata: sdata to remove all stations from 637 * @vlans: if the given interface is an AP interface, also flush VLANs 638 */ 639 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans); 640 641 static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata) 642 { 643 return __sta_info_flush(sdata, false); 644 } 645 646 void sta_set_rate_info_tx(struct sta_info *sta, 647 const struct ieee80211_tx_rate *rate, 648 struct rate_info *rinfo); 649 void sta_set_rate_info_rx(struct sta_info *sta, 650 struct rate_info *rinfo); 651 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo); 652 653 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, 654 unsigned long exp_time); 655 u8 sta_info_tx_streams(struct sta_info *sta); 656 657 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta); 658 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta); 659 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta); 660 661 #endif /* STA_INFO_H */ 662