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, but
23 * only indirectly with set_sta_flag() and friends.
25 * @WLAN_STA_AUTH: Station is authenticated.
26 * @WLAN_STA_ASSOC: Station is associated.
27 * @WLAN_STA_PS_STA: Station is in power-save mode
28 * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
29 * This bit is always checked so needs to be enabled for all stations
30 * when virtual port control is not in use.
31 * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
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_TDLS_PEER: Station is a TDLS peer.
47 * @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
48 * packets. This means the link is enabled.
49 * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
50 * keeping station in power-save mode, reply when the driver
51 * unblocks the station.
52 * @WLAN_STA_SP: Station is in a service period, so don't try to
53 * reply to other uAPSD trigger frames or PS-Poll.
54 * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
55 * @WLAN_STA_INSERTED: This station is inserted into the hash table.
57 enum ieee80211_sta_info_flags {
62 WLAN_STA_SHORT_PREAMBLE,
65 WLAN_STA_CLEAR_PS_FILT,
71 WLAN_STA_TDLS_PEER_AUTH,
78 #define STA_TID_NUM 16
79 #define ADDBA_RESP_INTERVAL HZ
80 #define HT_AGG_MAX_RETRIES 15
81 #define HT_AGG_BURST_RETRIES 3
82 #define HT_AGG_RETRIES_PERIOD (15 * HZ)
84 #define HT_AGG_STATE_DRV_READY 0
85 #define HT_AGG_STATE_RESPONSE_RECEIVED 1
86 #define HT_AGG_STATE_OPERATIONAL 2
87 #define HT_AGG_STATE_STOPPING 3
88 #define HT_AGG_STATE_WANT_START 4
89 #define HT_AGG_STATE_WANT_STOP 5
92 * struct tid_ampdu_tx - TID aggregation information (Tx).
94 * @rcu_head: rcu head for freeing structure
95 * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
96 * @addba_resp_timer: timer for peer's response to addba request
97 * @pending: pending frames queue -- use sta's spinlock to protect
98 * @dialog_token: dialog token for aggregation session
99 * @timeout: session timeout value to be filled in ADDBA requests
100 * @state: session state (see above)
101 * @stop_initiator: initiator of a session stop
102 * @tx_stop: TX DelBA frame when stopping
103 * @buf_size: reorder buffer size at receiver
104 * @failed_bar_ssn: ssn of the last failed BAR tx attempt
105 * @bar_pending: BAR needs to be re-sent
107 * This structure's lifetime is managed by RCU, assignments to
108 * the array holding it must hold the aggregation mutex.
110 * The TX path can access it under RCU lock-free if, and
111 * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
112 * set. Otherwise, the TX path must also acquire the spinlock
113 * and re-check the state, see comments in the tx code
116 struct tid_ampdu_tx {
117 struct rcu_head rcu_head;
118 struct timer_list session_timer;
119 struct timer_list addba_resp_timer;
120 struct sk_buff_head pending;
133 * struct tid_ampdu_rx - TID aggregation information (Rx).
135 * @reorder_buf: buffer to reorder incoming aggregated MPDUs
136 * @reorder_time: jiffies when skb was added
137 * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
138 * @reorder_timer: releases expired frames from the reorder buffer.
139 * @head_seq_num: head sequence number in reordering buffer.
140 * @stored_mpdu_num: number of MPDUs in reordering buffer
141 * @ssn: Starting Sequence Number expected to be aggregated.
142 * @buf_size: buffer size for incoming A-MPDUs
143 * @timeout: reset timer value (in TUs).
144 * @dialog_token: dialog token for aggregation session
145 * @rcu_head: RCU head used for freeing this struct
146 * @reorder_lock: serializes access to reorder buffer, see below.
148 * This structure's lifetime is managed by RCU, assignments to
149 * the array holding it must hold the aggregation mutex.
151 * The @reorder_lock is used to protect the members of this
152 * struct, except for @timeout, @buf_size and @dialog_token,
153 * which are constant across the lifetime of the struct (the
154 * dialog token being used only for debugging).
156 struct tid_ampdu_rx {
157 struct rcu_head rcu_head;
158 spinlock_t reorder_lock;
159 struct sk_buff **reorder_buf;
160 unsigned long *reorder_time;
161 struct timer_list session_timer;
162 struct timer_list reorder_timer;
172 * struct sta_ampdu_mlme - STA aggregation information.
174 * @tid_rx: aggregation info for Rx per TID -- RCU protected
175 * @tid_tx: aggregation info for Tx per TID
176 * @tid_start_tx: sessions where start was requested
177 * @addba_req_num: number of times addBA request has been sent.
178 * @last_addba_req_time: timestamp of the last addBA request.
179 * @dialog_token_allocator: dialog token enumerator for each new session;
180 * @work: work struct for starting/stopping aggregation
181 * @tid_rx_timer_expired: bitmap indicating on which TIDs the
182 * RX timer expired until the work for it runs
183 * @tid_rx_stop_requested: bitmap indicating which BA sessions per TID the
184 * driver requested to close until the work for it runs
185 * @mtx: mutex to protect all TX data (except non-NULL assignments
186 * to tid_tx[idx], which are protected by the sta spinlock)
188 struct sta_ampdu_mlme {
191 struct tid_ampdu_rx __rcu *tid_rx[STA_TID_NUM];
192 unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
193 unsigned long tid_rx_stop_requested[BITS_TO_LONGS(STA_TID_NUM)];
195 struct work_struct work;
196 struct tid_ampdu_tx __rcu *tid_tx[STA_TID_NUM];
197 struct tid_ampdu_tx *tid_start_tx[STA_TID_NUM];
198 unsigned long last_addba_req_time[STA_TID_NUM];
199 u8 addba_req_num[STA_TID_NUM];
200 u8 dialog_token_allocator;
205 * struct sta_info - STA information
207 * This structure collects information about a station that
208 * mac80211 is communicating with.
210 * @list: global linked list entry
211 * @hnext: hash table linked list pointer
212 * @local: pointer to the global information
213 * @sdata: virtual interface this station belongs to
214 * @ptk: peer key negotiated with this station, if any
215 * @gtk: group keys negotiated with this station, if any
216 * @rate_ctrl: rate control algorithm reference
217 * @rate_ctrl_priv: rate control private per-STA pointer
218 * @last_tx_rate: rate used for last transmit, to report to userspace as
219 * "the" transmit rate
220 * @last_rx_rate_idx: rx status rate index of the last data packet
221 * @last_rx_rate_flag: rx status flag of the last data packet
222 * @lock: used for locking all fields that require locking, see comments
223 * in the header file.
224 * @drv_unblock_wk: used for driver PS unblocking
225 * @listen_interval: listen interval of this station, when we're acting as AP
226 * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
227 * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
228 * when it leaves power saving state or polls
229 * @tx_filtered: buffers (per AC) of frames we already tried to
230 * transmit but were filtered by hardware due to STA having
231 * entered power saving state, these are also delivered to
232 * the station when it leaves powersave or polls for frames
233 * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
234 * @rx_packets: Number of MSDUs received from this STA
235 * @rx_bytes: Number of bytes received from this STA
236 * @wep_weak_iv_count: number of weak WEP IVs received from this station
237 * @last_rx: time (in jiffies) when last frame was received from this STA
238 * @last_connected: time (in seconds) when a station got connected
239 * @num_duplicates: number of duplicate frames received from this STA
240 * @rx_fragments: number of received MPDUs
241 * @rx_dropped: number of dropped MPDUs from this STA
242 * @last_signal: signal of last received frame from this STA
243 * @avg_signal: moving average of signal of received frames from this STA
244 * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
245 * @tx_filtered_count: number of frames the hardware filtered for this STA
246 * @tx_retry_failed: number of frames that failed retry
247 * @tx_retry_count: total number of retries for frames to this STA
248 * @fail_avg: moving percentage of failed MSDUs
249 * @tx_packets: number of RX/TX MSDUs
250 * @tx_bytes: number of bytes transmitted to this STA
251 * @tx_fragments: number of transmitted MPDUs
252 * @tid_seq: per-TID sequence numbers for sending to this STA
253 * @ampdu_mlme: A-MPDU state machine state
254 * @timer_to_tid: identity mapping to ID timers
255 * @llid: Local link ID
256 * @plid: Peer link ID
257 * @reason: Cancel reason on PLINK_HOLDING state
258 * @plink_retries: Retries in establishment
259 * @ignore_plink_timer: ignore the peer-link timer (used internally)
260 * @plink_state: peer link state
261 * @plink_timeout: timeout of peer link
262 * @plink_timer: peer link watch timer
263 * @plink_timer_was_running: used by suspend/resume to restore timers
264 * @debugfs: debug filesystem info
265 * @dead: set to true when sta is unlinked
266 * @uploaded: set to true when sta is uploaded to the driver
267 * @lost_packets: number of consecutive lost packets
268 * @dummy: indicate a dummy station created for receiving
269 * EAP frames before association
270 * @sta: station information we share with the driver
271 * @sta_state: duplicates information about station state (for debug)
272 * @beacon_loss_count: number of times beacon loss has triggered
275 /* General information, mostly static */
276 struct list_head list;
277 struct sta_info __rcu *hnext;
278 struct ieee80211_local *local;
279 struct ieee80211_sub_if_data *sdata;
280 struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
281 struct ieee80211_key __rcu *ptk;
282 struct rate_control_ref *rate_ctrl;
283 void *rate_ctrl_priv;
286 struct work_struct drv_unblock_wk;
294 enum ieee80211_sta_state sta_state;
296 /* use the accessors defined below */
297 unsigned long _flags;
300 * STA powersave frame queues, no more than the internal
303 struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
304 struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
305 unsigned long driver_buffered_tids;
307 /* Updated from RX path only, no locking requirements */
308 unsigned long rx_packets, rx_bytes;
309 unsigned long wep_weak_iv_count;
310 unsigned long last_rx;
312 unsigned long num_duplicates;
313 unsigned long rx_fragments;
314 unsigned long rx_dropped;
316 struct ewma avg_signal;
317 /* Plus 1 for non-QoS frames */
318 __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES + 1];
320 /* Updated from TX status path only, no locking requirements */
321 unsigned long tx_filtered_count;
322 unsigned long tx_retry_failed, tx_retry_count;
323 /* moving percentage of failed MSDUs */
324 unsigned int fail_avg;
326 /* Updated from TX path only, no locking requirements */
327 unsigned long tx_packets;
328 unsigned long tx_bytes;
329 unsigned long tx_fragments;
330 struct ieee80211_tx_rate last_tx_rate;
331 int last_rx_rate_idx;
332 int last_rx_rate_flag;
333 u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
336 * Aggregation information, locked with lock.
338 struct sta_ampdu_mlme ampdu_mlme;
339 u8 timer_to_tid[STA_TID_NUM];
341 #ifdef CONFIG_MAC80211_MESH
343 * Mesh peer link attributes
344 * TODO: move to a sub-structure that is referenced with pointer?
350 bool ignore_plink_timer;
351 bool plink_timer_was_running;
352 enum nl80211_plink_state plink_state;
354 struct timer_list plink_timer;
357 #ifdef CONFIG_MAC80211_DEBUGFS
358 struct sta_info_debugfsdentries {
364 unsigned int lost_packets;
365 unsigned int beacon_loss_count;
367 /* should be right in front of sta to be in the same cache line */
371 struct ieee80211_sta sta;
374 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
376 #ifdef CONFIG_MAC80211_MESH
377 return sta->plink_state;
379 return NL80211_PLINK_LISTEN;
382 static inline void set_sta_flag(struct sta_info *sta,
383 enum ieee80211_sta_info_flags flag)
385 WARN_ON(flag == WLAN_STA_AUTH ||
386 flag == WLAN_STA_ASSOC ||
387 flag == WLAN_STA_AUTHORIZED);
388 set_bit(flag, &sta->_flags);
391 static inline void clear_sta_flag(struct sta_info *sta,
392 enum ieee80211_sta_info_flags flag)
394 WARN_ON(flag == WLAN_STA_AUTH ||
395 flag == WLAN_STA_ASSOC ||
396 flag == WLAN_STA_AUTHORIZED);
397 clear_bit(flag, &sta->_flags);
400 static inline int test_sta_flag(struct sta_info *sta,
401 enum ieee80211_sta_info_flags flag)
403 return test_bit(flag, &sta->_flags);
406 static inline int test_and_clear_sta_flag(struct sta_info *sta,
407 enum ieee80211_sta_info_flags flag)
409 WARN_ON(flag == WLAN_STA_AUTH ||
410 flag == WLAN_STA_ASSOC ||
411 flag == WLAN_STA_AUTHORIZED);
412 return test_and_clear_bit(flag, &sta->_flags);
415 static inline int test_and_set_sta_flag(struct sta_info *sta,
416 enum ieee80211_sta_info_flags flag)
418 WARN_ON(flag == WLAN_STA_AUTH ||
419 flag == WLAN_STA_ASSOC ||
420 flag == WLAN_STA_AUTHORIZED);
421 return test_and_set_bit(flag, &sta->_flags);
424 int sta_info_move_state(struct sta_info *sta,
425 enum ieee80211_sta_state new_state);
427 static inline void sta_info_pre_move_state(struct sta_info *sta,
428 enum ieee80211_sta_state new_state)
432 WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
434 ret = sta_info_move_state(sta, new_state);
439 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
440 struct tid_ampdu_tx *tid_tx);
442 static inline struct tid_ampdu_tx *
443 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
445 return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
446 lockdep_is_held(&sta->lock) ||
447 lockdep_is_held(&sta->ampdu_mlme.mtx));
450 #define STA_HASH_SIZE 256
451 #define STA_HASH(sta) (sta[5])
454 /* Maximum number of frames to buffer per power saving station per AC */
455 #define STA_MAX_TX_BUFFER 64
457 /* Minimum buffered frame expiry time. If STA uses listen interval that is
458 * smaller than this value, the minimum value here is used instead. */
459 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
461 /* How often station data is cleaned up (e.g., expiration of buffered frames)
463 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
466 * Get a STA info, must be under RCU read lock.
468 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
471 struct sta_info *sta_info_get_rx(struct ieee80211_sub_if_data *sdata,
474 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
477 struct sta_info *sta_info_get_bss_rx(struct ieee80211_sub_if_data *sdata,
481 void for_each_sta_info_type_check(struct ieee80211_local *local,
483 struct sta_info *sta,
484 struct sta_info *nxt)
488 #define for_each_sta_info(local, _addr, _sta, nxt) \
489 for ( /* initialise loop */ \
490 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
491 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
493 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
494 /* continue condition */ \
498 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
500 /* run code only if address matches and it's not a dummy sta */ \
501 if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0 && \
504 #define for_each_sta_info_rx(local, _addr, _sta, nxt) \
505 for ( /* initialise loop */ \
506 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
507 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
509 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
510 /* continue condition */ \
514 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
516 /* compare address and run code only if it matches */ \
517 if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)
520 * Get STA info by index, BROKEN!
522 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
525 * Create a new STA info, caller owns returned structure
526 * until sta_info_insert().
528 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
529 const u8 *addr, gfp_t gfp);
531 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
534 * Insert STA info into hash table/list, returns zero or a
535 * -EEXIST if (if the same MAC address is already present).
537 * Calling the non-rcu version makes the caller relinquish,
538 * the _rcu version calls read_lock_rcu() and must be called
541 int sta_info_insert(struct sta_info *sta);
542 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
543 int sta_info_reinsert(struct sta_info *sta);
545 int __must_check __sta_info_destroy(struct sta_info *sta);
546 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
548 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
551 void sta_info_recalc_tim(struct sta_info *sta);
553 void sta_info_init(struct ieee80211_local *local);
554 void sta_info_stop(struct ieee80211_local *local);
555 int sta_info_flush(struct ieee80211_local *local,
556 struct ieee80211_sub_if_data *sdata);
557 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
558 unsigned long exp_time);
560 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
561 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
562 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
564 #endif /* STA_INFO_H */