2 * Copyright 2002-2005, Devicescape Software, Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
12 #include <linux/list.h>
13 #include <linux/types.h>
14 #include <linux/if_ether.h>
15 #include <linux/workqueue.h>
16 #include <linux/average.h>
20 * enum ieee80211_sta_info_flags - Stations flags
22 * These flags are used with &struct sta_info's @flags member.
24 * @WLAN_STA_AUTH: Station is authenticated.
25 * @WLAN_STA_ASSOC: Station is associated.
26 * @WLAN_STA_PS_STA: Station is in power-save mode
27 * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
28 * This bit is always checked so needs to be enabled for all stations
29 * when virtual port control is not in use.
30 * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
32 * @WLAN_STA_ASSOC_AP: We're associated to that station, it is an AP.
33 * @WLAN_STA_WME: Station is a QoS-STA.
34 * @WLAN_STA_WDS: Station is one of our WDS peers.
35 * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
36 * IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
37 * frame to this station is transmitted.
38 * @WLAN_STA_MFP: Management frame protection is used with this STA.
39 * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
40 * during suspend/resume and station removal.
41 * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
42 * power-save mode logically to flush frames that might still
44 * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
45 * station in power-save mode, reply when the driver unblocks.
46 * @WLAN_STA_PS_DRIVER_BUF: Station has frames pending in driver internal
47 * buffers. Automatically cleared on station wake-up.
48 * @WLAN_STA_TDLS_PEER: station is a TDLS peer.
50 enum ieee80211_sta_info_flags {
52 WLAN_STA_ASSOC = 1<<1,
53 WLAN_STA_PS_STA = 1<<2,
54 WLAN_STA_AUTHORIZED = 1<<3,
55 WLAN_STA_SHORT_PREAMBLE = 1<<4,
56 WLAN_STA_ASSOC_AP = 1<<5,
59 WLAN_STA_CLEAR_PS_FILT = 1<<9,
61 WLAN_STA_BLOCK_BA = 1<<11,
62 WLAN_STA_PS_DRIVER = 1<<12,
63 WLAN_STA_PSPOLL = 1<<13,
64 WLAN_STA_PS_DRIVER_BUF = 1<<14,
65 WLAN_STA_TDLS_PEER = 1<<15,
68 #define STA_TID_NUM 16
69 #define ADDBA_RESP_INTERVAL HZ
70 #define HT_AGG_MAX_RETRIES 0x3
72 #define HT_AGG_STATE_DRV_READY 0
73 #define HT_AGG_STATE_RESPONSE_RECEIVED 1
74 #define HT_AGG_STATE_OPERATIONAL 2
75 #define HT_AGG_STATE_STOPPING 3
76 #define HT_AGG_STATE_WANT_START 4
77 #define HT_AGG_STATE_WANT_STOP 5
80 * struct tid_ampdu_tx - TID aggregation information (Tx).
82 * @rcu_head: rcu head for freeing structure
83 * @addba_resp_timer: timer for peer's response to addba request
84 * @pending: pending frames queue -- use sta's spinlock to protect
85 * @dialog_token: dialog token for aggregation session
86 * @timeout: session timeout value to be filled in ADDBA requests
87 * @state: session state (see above)
88 * @stop_initiator: initiator of a session stop
89 * @tx_stop: TX DelBA frame when stopping
90 * @buf_size: reorder buffer size at receiver
91 * @failed_bar_ssn: ssn of the last failed BAR tx attempt
92 * @bar_pending: BAR needs to be re-sent
94 * This structure's lifetime is managed by RCU, assignments to
95 * the array holding it must hold the aggregation mutex.
97 * The TX path can access it under RCU lock-free if, and
98 * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
99 * set. Otherwise, the TX path must also acquire the spinlock
100 * and re-check the state, see comments in the tx code
103 struct tid_ampdu_tx {
104 struct rcu_head rcu_head;
105 struct timer_list addba_resp_timer;
106 struct sk_buff_head pending;
119 * struct tid_ampdu_rx - TID aggregation information (Rx).
121 * @reorder_buf: buffer to reorder incoming aggregated MPDUs
122 * @reorder_time: jiffies when skb was added
123 * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
124 * @reorder_timer: releases expired frames from the reorder buffer.
125 * @head_seq_num: head sequence number in reordering buffer.
126 * @stored_mpdu_num: number of MPDUs in reordering buffer
127 * @ssn: Starting Sequence Number expected to be aggregated.
128 * @buf_size: buffer size for incoming A-MPDUs
129 * @timeout: reset timer value (in TUs).
130 * @dialog_token: dialog token for aggregation session
131 * @rcu_head: RCU head used for freeing this struct
132 * @reorder_lock: serializes access to reorder buffer, see below.
134 * This structure's lifetime is managed by RCU, assignments to
135 * the array holding it must hold the aggregation mutex.
137 * The @reorder_lock is used to protect the members of this
138 * struct, except for @timeout, @buf_size and @dialog_token,
139 * which are constant across the lifetime of the struct (the
140 * dialog token being used only for debugging).
142 struct tid_ampdu_rx {
143 struct rcu_head rcu_head;
144 spinlock_t reorder_lock;
145 struct sk_buff **reorder_buf;
146 unsigned long *reorder_time;
147 struct timer_list session_timer;
148 struct timer_list reorder_timer;
158 * struct sta_ampdu_mlme - STA aggregation information.
160 * @tid_rx: aggregation info for Rx per TID -- RCU protected
161 * @tid_tx: aggregation info for Tx per TID
162 * @tid_start_tx: sessions where start was requested
163 * @addba_req_num: number of times addBA request has been sent.
164 * @dialog_token_allocator: dialog token enumerator for each new session;
165 * @work: work struct for starting/stopping aggregation
166 * @tid_rx_timer_expired: bitmap indicating on which TIDs the
167 * RX timer expired until the work for it runs
168 * @tid_rx_stop_requested: bitmap indicating which BA sessions per TID the
169 * driver requested to close until the work for it runs
170 * @mtx: mutex to protect all TX data (except non-NULL assignments
171 * to tid_tx[idx], which are protected by the sta spinlock)
173 struct sta_ampdu_mlme {
176 struct tid_ampdu_rx __rcu *tid_rx[STA_TID_NUM];
177 unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
178 unsigned long tid_rx_stop_requested[BITS_TO_LONGS(STA_TID_NUM)];
180 struct work_struct work;
181 struct tid_ampdu_tx __rcu *tid_tx[STA_TID_NUM];
182 struct tid_ampdu_tx *tid_start_tx[STA_TID_NUM];
183 u8 addba_req_num[STA_TID_NUM];
184 u8 dialog_token_allocator;
189 * struct sta_info - STA information
191 * This structure collects information about a station that
192 * mac80211 is communicating with.
194 * @list: global linked list entry
195 * @hnext: hash table linked list pointer
196 * @local: pointer to the global information
197 * @sdata: virtual interface this station belongs to
198 * @ptk: peer key negotiated with this station, if any
199 * @gtk: group keys negotiated with this station, if any
200 * @rate_ctrl: rate control algorithm reference
201 * @rate_ctrl_priv: rate control private per-STA pointer
202 * @last_tx_rate: rate used for last transmit, to report to userspace as
203 * "the" transmit rate
204 * @last_rx_rate_idx: rx status rate index of the last data packet
205 * @last_rx_rate_flag: rx status flag of the last data packet
206 * @lock: used for locking all fields that require locking, see comments
207 * in the header file.
208 * @flaglock: spinlock for flags accesses
209 * @drv_unblock_wk: used for driver PS unblocking
210 * @listen_interval: listen interval of this station, when we're acting as AP
211 * @flags: STA flags, see &enum ieee80211_sta_info_flags
212 * @ps_tx_buf: buffer of frames to transmit to this station
213 * when it leaves power saving state
214 * @tx_filtered: buffer of frames we already tried to transmit
215 * but were filtered by hardware due to STA having entered
217 * @rx_packets: Number of MSDUs received from this STA
218 * @rx_bytes: Number of bytes received from this STA
219 * @wep_weak_iv_count: number of weak WEP IVs received from this station
220 * @last_rx: time (in jiffies) when last frame was received from this STA
221 * @last_connected: time (in seconds) when a station got connected
222 * @num_duplicates: number of duplicate frames received from this STA
223 * @rx_fragments: number of received MPDUs
224 * @rx_dropped: number of dropped MPDUs from this STA
225 * @last_signal: signal of last received frame from this STA
226 * @avg_signal: moving average of signal of received frames from this STA
227 * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
228 * @tx_filtered_count: number of frames the hardware filtered for this STA
229 * @tx_retry_failed: number of frames that failed retry
230 * @tx_retry_count: total number of retries for frames to this STA
231 * @fail_avg: moving percentage of failed MSDUs
232 * @tx_packets: number of RX/TX MSDUs
233 * @tx_bytes: number of bytes transmitted to this STA
234 * @tx_fragments: number of transmitted MPDUs
235 * @tid_seq: per-TID sequence numbers for sending to this STA
236 * @ampdu_mlme: A-MPDU state machine state
237 * @timer_to_tid: identity mapping to ID timers
238 * @llid: Local link ID
239 * @plid: Peer link ID
240 * @reason: Cancel reason on PLINK_HOLDING state
241 * @plink_retries: Retries in establishment
242 * @ignore_plink_timer: ignore the peer-link timer (used internally)
243 * @plink_state: peer link state
244 * @plink_timeout: timeout of peer link
245 * @plink_timer: peer link watch timer
246 * @plink_timer_was_running: used by suspend/resume to restore timers
247 * @debugfs: debug filesystem info
248 * @dead: set to true when sta is unlinked
249 * @uploaded: set to true when sta is uploaded to the driver
250 * @lost_packets: number of consecutive lost packets
251 * @dummy: indicate a dummy station created for receiving
252 * EAP frames before association
253 * @sta: station information we share with the driver
256 /* General information, mostly static */
257 struct list_head list;
258 struct sta_info __rcu *hnext;
259 struct ieee80211_local *local;
260 struct ieee80211_sub_if_data *sdata;
261 struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
262 struct ieee80211_key __rcu *ptk;
263 struct rate_control_ref *rate_ctrl;
264 void *rate_ctrl_priv;
268 struct work_struct drv_unblock_wk;
277 * frequently updated, locked with own spinlock (flaglock),
278 * use the accessors defined below
283 * STA powersave frame queues, no more than the internal
286 struct sk_buff_head ps_tx_buf;
287 struct sk_buff_head tx_filtered;
289 /* Updated from RX path only, no locking requirements */
290 unsigned long rx_packets, rx_bytes;
291 unsigned long wep_weak_iv_count;
292 unsigned long last_rx;
294 unsigned long num_duplicates;
295 unsigned long rx_fragments;
296 unsigned long rx_dropped;
298 struct ewma avg_signal;
299 /* Plus 1 for non-QoS frames */
300 __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES + 1];
302 /* Updated from TX status path only, no locking requirements */
303 unsigned long tx_filtered_count;
304 unsigned long tx_retry_failed, tx_retry_count;
305 /* moving percentage of failed MSDUs */
306 unsigned int fail_avg;
308 /* Updated from TX path only, no locking requirements */
309 unsigned long tx_packets;
310 unsigned long tx_bytes;
311 unsigned long tx_fragments;
312 struct ieee80211_tx_rate last_tx_rate;
313 int last_rx_rate_idx;
314 int last_rx_rate_flag;
315 u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
318 * Aggregation information, locked with lock.
320 struct sta_ampdu_mlme ampdu_mlme;
321 u8 timer_to_tid[STA_TID_NUM];
323 #ifdef CONFIG_MAC80211_MESH
325 * Mesh peer link attributes
326 * TODO: move to a sub-structure that is referenced with pointer?
332 bool ignore_plink_timer;
333 bool plink_timer_was_running;
334 enum nl80211_plink_state plink_state;
336 struct timer_list plink_timer;
339 #ifdef CONFIG_MAC80211_DEBUGFS
340 struct sta_info_debugfsdentries {
346 unsigned int lost_packets;
348 /* should be right in front of sta to be in the same cache line */
352 struct ieee80211_sta sta;
355 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
357 #ifdef CONFIG_MAC80211_MESH
358 return sta->plink_state;
360 return NL80211_PLINK_LISTEN;
363 static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
367 spin_lock_irqsave(&sta->flaglock, irqfl);
369 spin_unlock_irqrestore(&sta->flaglock, irqfl);
372 static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
376 spin_lock_irqsave(&sta->flaglock, irqfl);
377 sta->flags &= ~flags;
378 spin_unlock_irqrestore(&sta->flaglock, irqfl);
381 static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
386 spin_lock_irqsave(&sta->flaglock, irqfl);
387 ret = sta->flags & flags;
388 spin_unlock_irqrestore(&sta->flaglock, irqfl);
393 static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
399 spin_lock_irqsave(&sta->flaglock, irqfl);
400 ret = sta->flags & flags;
401 sta->flags &= ~flags;
402 spin_unlock_irqrestore(&sta->flaglock, irqfl);
407 static inline u32 get_sta_flags(struct sta_info *sta)
412 spin_lock_irqsave(&sta->flaglock, irqfl);
414 spin_unlock_irqrestore(&sta->flaglock, irqfl);
419 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
420 struct tid_ampdu_tx *tid_tx);
422 static inline struct tid_ampdu_tx *
423 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
425 return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
426 lockdep_is_held(&sta->lock) ||
427 lockdep_is_held(&sta->ampdu_mlme.mtx));
430 #define STA_HASH_SIZE 256
431 #define STA_HASH(sta) (sta[5])
434 /* Maximum number of frames to buffer per power saving station */
435 #define STA_MAX_TX_BUFFER 128
437 /* Minimum buffered frame expiry time. If STA uses listen interval that is
438 * smaller than this value, the minimum value here is used instead. */
439 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
441 /* How often station data is cleaned up (e.g., expiration of buffered frames)
443 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
446 * Get a STA info, must be under RCU read lock.
448 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
451 struct sta_info *sta_info_get_rx(struct ieee80211_sub_if_data *sdata,
454 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
457 struct sta_info *sta_info_get_bss_rx(struct ieee80211_sub_if_data *sdata,
461 void for_each_sta_info_type_check(struct ieee80211_local *local,
463 struct sta_info *sta,
464 struct sta_info *nxt)
468 #define for_each_sta_info(local, _addr, _sta, nxt) \
469 for ( /* initialise loop */ \
470 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
471 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
473 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
474 /* continue condition */ \
478 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
480 /* run code only if address matches and it's not a dummy sta */ \
481 if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0 && \
484 #define for_each_sta_info_rx(local, _addr, _sta, nxt) \
485 for ( /* initialise loop */ \
486 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
487 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
489 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
490 /* continue condition */ \
494 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
496 /* compare address and run code only if it matches */ \
497 if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)
500 * Get STA info by index, BROKEN!
502 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
505 * Create a new STA info, caller owns returned structure
506 * until sta_info_insert().
508 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
509 u8 *addr, gfp_t gfp);
511 * Insert STA info into hash table/list, returns zero or a
512 * -EEXIST if (if the same MAC address is already present).
514 * Calling the non-rcu version makes the caller relinquish,
515 * the _rcu version calls read_lock_rcu() and must be called
518 int sta_info_insert(struct sta_info *sta);
519 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
520 int sta_info_insert_atomic(struct sta_info *sta);
521 int sta_info_reinsert(struct sta_info *sta);
523 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
525 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
528 void sta_info_set_tim_bit(struct sta_info *sta);
529 void sta_info_clear_tim_bit(struct sta_info *sta);
531 void sta_info_init(struct ieee80211_local *local);
532 void sta_info_stop(struct ieee80211_local *local);
533 int sta_info_flush(struct ieee80211_local *local,
534 struct ieee80211_sub_if_data *sdata);
535 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
536 unsigned long exp_time);
538 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
539 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
541 #endif /* STA_INFO_H */