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>
17 #include <linux/etherdevice.h>
21 * enum ieee80211_sta_info_flags - Stations flags
23 * These flags are used with &struct sta_info's @flags member, but
24 * only indirectly with set_sta_flag() and friends.
26 * @WLAN_STA_AUTH: Station is authenticated.
27 * @WLAN_STA_ASSOC: Station is associated.
28 * @WLAN_STA_PS_STA: Station is in power-save mode
29 * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
30 * This bit is always checked so needs to be enabled for all stations
31 * when virtual port control is not in use.
32 * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
34 * @WLAN_STA_WME: Station is a QoS-STA.
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
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_UAPSD: Station requested unscheduled SP while driver was
51 * keeping station in power-save mode, reply when the driver
52 * unblocks the station.
53 * @WLAN_STA_SP: Station is in a service period, so don't try to
54 * reply to other uAPSD trigger frames or PS-Poll.
55 * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
56 * @WLAN_STA_INSERTED: This station is inserted into the hash table.
57 * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
59 enum ieee80211_sta_info_flags {
64 WLAN_STA_SHORT_PREAMBLE,
67 WLAN_STA_CLEAR_PS_FILT,
73 WLAN_STA_TDLS_PEER_AUTH,
78 WLAN_STA_RATE_CONTROL,
81 #define STA_TID_NUM 16
82 #define ADDBA_RESP_INTERVAL HZ
83 #define HT_AGG_MAX_RETRIES 15
84 #define HT_AGG_BURST_RETRIES 3
85 #define HT_AGG_RETRIES_PERIOD (15 * HZ)
87 #define HT_AGG_STATE_DRV_READY 0
88 #define HT_AGG_STATE_RESPONSE_RECEIVED 1
89 #define HT_AGG_STATE_OPERATIONAL 2
90 #define HT_AGG_STATE_STOPPING 3
91 #define HT_AGG_STATE_WANT_START 4
92 #define HT_AGG_STATE_WANT_STOP 5
95 * struct tid_ampdu_tx - TID aggregation information (Tx).
97 * @rcu_head: rcu head for freeing structure
98 * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
99 * @addba_resp_timer: timer for peer's response to addba request
100 * @pending: pending frames queue -- use sta's spinlock to protect
101 * @dialog_token: dialog token for aggregation session
102 * @timeout: session timeout value to be filled in ADDBA requests
103 * @state: session state (see above)
104 * @stop_initiator: initiator of a session stop
105 * @tx_stop: TX DelBA frame when stopping
106 * @buf_size: reorder buffer size at receiver
107 * @failed_bar_ssn: ssn of the last failed BAR tx attempt
108 * @bar_pending: BAR needs to be re-sent
110 * This structure's lifetime is managed by RCU, assignments to
111 * the array holding it must hold the aggregation mutex.
113 * The TX path can access it under RCU lock-free if, and
114 * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
115 * set. Otherwise, the TX path must also acquire the spinlock
116 * and re-check the state, see comments in the tx code
119 struct tid_ampdu_tx {
120 struct rcu_head rcu_head;
121 struct timer_list session_timer;
122 struct timer_list addba_resp_timer;
123 struct sk_buff_head pending;
136 * struct tid_ampdu_rx - TID aggregation information (Rx).
138 * @reorder_buf: buffer to reorder incoming aggregated MPDUs
139 * @reorder_time: jiffies when skb was added
140 * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
141 * @reorder_timer: releases expired frames from the reorder buffer.
142 * @head_seq_num: head sequence number in reordering buffer.
143 * @stored_mpdu_num: number of MPDUs in reordering buffer
144 * @ssn: Starting Sequence Number expected to be aggregated.
145 * @buf_size: buffer size for incoming A-MPDUs
146 * @timeout: reset timer value (in TUs).
147 * @dialog_token: dialog token for aggregation session
148 * @rcu_head: RCU head used for freeing this struct
149 * @reorder_lock: serializes access to reorder buffer, see below.
151 * This structure's lifetime is managed by RCU, assignments to
152 * the array holding it must hold the aggregation mutex.
154 * The @reorder_lock is used to protect the members of this
155 * struct, except for @timeout, @buf_size and @dialog_token,
156 * which are constant across the lifetime of the struct (the
157 * dialog token being used only for debugging).
159 struct tid_ampdu_rx {
160 struct rcu_head rcu_head;
161 spinlock_t reorder_lock;
162 struct sk_buff **reorder_buf;
163 unsigned long *reorder_time;
164 struct timer_list session_timer;
165 struct timer_list reorder_timer;
175 * struct sta_ampdu_mlme - STA aggregation information.
177 * @tid_rx: aggregation info for Rx per TID -- RCU protected
178 * @tid_tx: aggregation info for Tx per TID
179 * @tid_start_tx: sessions where start was requested
180 * @addba_req_num: number of times addBA request has been sent.
181 * @last_addba_req_time: timestamp of the last addBA request.
182 * @dialog_token_allocator: dialog token enumerator for each new session;
183 * @work: work struct for starting/stopping aggregation
184 * @tid_rx_timer_expired: bitmap indicating on which TIDs the
185 * RX timer expired until the work for it runs
186 * @tid_rx_stop_requested: bitmap indicating which BA sessions per TID the
187 * driver requested to close until the work for it runs
188 * @mtx: mutex to protect all TX data (except non-NULL assignments
189 * to tid_tx[idx], which are protected by the sta spinlock)
191 struct sta_ampdu_mlme {
194 struct tid_ampdu_rx __rcu *tid_rx[STA_TID_NUM];
195 unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
196 unsigned long tid_rx_stop_requested[BITS_TO_LONGS(STA_TID_NUM)];
198 struct work_struct work;
199 struct tid_ampdu_tx __rcu *tid_tx[STA_TID_NUM];
200 struct tid_ampdu_tx *tid_start_tx[STA_TID_NUM];
201 unsigned long last_addba_req_time[STA_TID_NUM];
202 u8 addba_req_num[STA_TID_NUM];
203 u8 dialog_token_allocator;
208 * struct sta_info - STA information
210 * This structure collects information about a station that
211 * mac80211 is communicating with.
213 * @list: global linked list entry
214 * @hnext: hash table linked list pointer
215 * @local: pointer to the global information
216 * @sdata: virtual interface this station belongs to
217 * @ptk: peer key negotiated with this station, if any
218 * @gtk: group keys negotiated with this station, if any
219 * @rate_ctrl: rate control algorithm reference
220 * @rate_ctrl_priv: rate control private per-STA pointer
221 * @last_tx_rate: rate used for last transmit, to report to userspace as
222 * "the" transmit rate
223 * @last_rx_rate_idx: rx status rate index of the last data packet
224 * @last_rx_rate_flag: rx status flag of the last data packet
225 * @lock: used for locking all fields that require locking, see comments
226 * in the header file.
227 * @drv_unblock_wk: used for driver PS unblocking
228 * @listen_interval: listen interval of this station, when we're acting as AP
229 * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
230 * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
231 * when it leaves power saving state or polls
232 * @tx_filtered: buffers (per AC) of frames we already tried to
233 * transmit but were filtered by hardware due to STA having
234 * entered power saving state, these are also delivered to
235 * the station when it leaves powersave or polls for frames
236 * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
237 * @rx_packets: Number of MSDUs received from this STA
238 * @rx_bytes: Number of bytes received from this STA
239 * @wep_weak_iv_count: number of weak WEP IVs received from this station
240 * @last_rx: time (in jiffies) when last frame was received from this STA
241 * @last_connected: time (in seconds) when a station got connected
242 * @num_duplicates: number of duplicate frames received from this STA
243 * @rx_fragments: number of received MPDUs
244 * @rx_dropped: number of dropped MPDUs from this STA
245 * @last_signal: signal of last received frame from this STA
246 * @avg_signal: moving average of signal of received frames from this STA
247 * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
248 * @tx_filtered_count: number of frames the hardware filtered for this STA
249 * @tx_retry_failed: number of frames that failed retry
250 * @tx_retry_count: total number of retries for frames to this STA
251 * @fail_avg: moving percentage of failed MSDUs
252 * @tx_packets: number of RX/TX MSDUs
253 * @tx_bytes: number of bytes transmitted to this STA
254 * @tx_fragments: number of transmitted MPDUs
255 * @tid_seq: per-TID sequence numbers for sending to this STA
256 * @ampdu_mlme: A-MPDU state machine state
257 * @timer_to_tid: identity mapping to ID timers
258 * @llid: Local link ID
259 * @plid: Peer link ID
260 * @reason: Cancel reason on PLINK_HOLDING state
261 * @plink_retries: Retries in establishment
262 * @ignore_plink_timer: ignore the peer-link timer (used internally)
263 * @plink_state: peer link state
264 * @plink_timeout: timeout of peer link
265 * @plink_timer: peer link watch timer
266 * @plink_timer_was_running: used by suspend/resume to restore timers
267 * @debugfs: debug filesystem info
268 * @dead: set to true when sta is unlinked
269 * @uploaded: set to true when sta is uploaded to the driver
270 * @lost_packets: number of consecutive lost packets
271 * @sta: station information we share with the driver
272 * @sta_state: duplicates information about station state (for debug)
273 * @beacon_loss_count: number of times beacon loss has triggered
276 /* General information, mostly static */
277 struct list_head list;
278 struct sta_info __rcu *hnext;
279 struct ieee80211_local *local;
280 struct ieee80211_sub_if_data *sdata;
281 struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
282 struct ieee80211_key __rcu *ptk;
283 struct rate_control_ref *rate_ctrl;
284 void *rate_ctrl_priv;
287 struct work_struct drv_unblock_wk;
295 enum ieee80211_sta_state sta_state;
297 /* use the accessors defined below */
298 unsigned long _flags;
301 * STA powersave frame queues, no more than the internal
304 struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
305 struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
306 unsigned long driver_buffered_tids;
308 /* Updated from RX path only, no locking requirements */
309 unsigned long rx_packets, rx_bytes;
310 unsigned long wep_weak_iv_count;
311 unsigned long last_rx;
313 unsigned long num_duplicates;
314 unsigned long rx_fragments;
315 unsigned long rx_dropped;
317 struct ewma avg_signal;
318 /* Plus 1 for non-QoS frames */
319 __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES + 1];
321 /* Updated from TX status path only, no locking requirements */
322 unsigned long tx_filtered_count;
323 unsigned long tx_retry_failed, tx_retry_count;
324 /* moving percentage of failed MSDUs */
325 unsigned int fail_avg;
327 /* Updated from TX path only, no locking requirements */
328 unsigned long tx_packets;
329 unsigned long tx_bytes;
330 unsigned long tx_fragments;
331 struct ieee80211_tx_rate last_tx_rate;
332 int last_rx_rate_idx;
333 int last_rx_rate_flag;
334 u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
337 * Aggregation information, locked with lock.
339 struct sta_ampdu_mlme ampdu_mlme;
340 u8 timer_to_tid[STA_TID_NUM];
342 #ifdef CONFIG_MAC80211_MESH
344 * Mesh peer link attributes
345 * TODO: move to a sub-structure that is referenced with pointer?
351 bool ignore_plink_timer;
352 bool plink_timer_was_running;
353 enum nl80211_plink_state plink_state;
355 struct timer_list plink_timer;
358 #ifdef CONFIG_MAC80211_DEBUGFS
359 struct sta_info_debugfsdentries {
365 unsigned int lost_packets;
366 unsigned int beacon_loss_count;
369 struct ieee80211_sta sta;
372 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
374 #ifdef CONFIG_MAC80211_MESH
375 return sta->plink_state;
377 return NL80211_PLINK_LISTEN;
380 static inline void set_sta_flag(struct sta_info *sta,
381 enum ieee80211_sta_info_flags flag)
383 WARN_ON(flag == WLAN_STA_AUTH ||
384 flag == WLAN_STA_ASSOC ||
385 flag == WLAN_STA_AUTHORIZED);
386 set_bit(flag, &sta->_flags);
389 static inline void clear_sta_flag(struct sta_info *sta,
390 enum ieee80211_sta_info_flags flag)
392 WARN_ON(flag == WLAN_STA_AUTH ||
393 flag == WLAN_STA_ASSOC ||
394 flag == WLAN_STA_AUTHORIZED);
395 clear_bit(flag, &sta->_flags);
398 static inline int test_sta_flag(struct sta_info *sta,
399 enum ieee80211_sta_info_flags flag)
401 return test_bit(flag, &sta->_flags);
404 static inline int test_and_clear_sta_flag(struct sta_info *sta,
405 enum ieee80211_sta_info_flags flag)
407 WARN_ON(flag == WLAN_STA_AUTH ||
408 flag == WLAN_STA_ASSOC ||
409 flag == WLAN_STA_AUTHORIZED);
410 return test_and_clear_bit(flag, &sta->_flags);
413 static inline int test_and_set_sta_flag(struct sta_info *sta,
414 enum ieee80211_sta_info_flags flag)
416 WARN_ON(flag == WLAN_STA_AUTH ||
417 flag == WLAN_STA_ASSOC ||
418 flag == WLAN_STA_AUTHORIZED);
419 return test_and_set_bit(flag, &sta->_flags);
422 int sta_info_move_state(struct sta_info *sta,
423 enum ieee80211_sta_state new_state);
425 static inline void sta_info_pre_move_state(struct sta_info *sta,
426 enum ieee80211_sta_state new_state)
430 WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
432 ret = sta_info_move_state(sta, new_state);
437 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
438 struct tid_ampdu_tx *tid_tx);
440 static inline struct tid_ampdu_tx *
441 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
443 return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
444 lockdep_is_held(&sta->lock) ||
445 lockdep_is_held(&sta->ampdu_mlme.mtx));
448 #define STA_HASH_SIZE 256
449 #define STA_HASH(sta) (sta[5])
452 /* Maximum number of frames to buffer per power saving station per AC */
453 #define STA_MAX_TX_BUFFER 64
455 /* Minimum buffered frame expiry time. If STA uses listen interval that is
456 * smaller than this value, the minimum value here is used instead. */
457 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
459 /* How often station data is cleaned up (e.g., expiration of buffered frames)
461 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
464 * Get a STA info, must be under RCU read lock.
466 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
469 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
473 void for_each_sta_info_type_check(struct ieee80211_local *local,
475 struct sta_info *sta,
476 struct sta_info *nxt)
480 #define for_each_sta_info(local, _addr, _sta, nxt) \
481 for ( /* initialise loop */ \
482 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
483 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
485 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
486 /* continue condition */ \
490 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
492 /* compare address and run code only if it matches */ \
493 if (compare_ether_addr(_sta->sta.addr, (_addr)) == 0)
496 * Get STA info by index, BROKEN!
498 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
501 * Create a new STA info, caller owns returned structure
502 * until sta_info_insert().
504 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
505 const u8 *addr, gfp_t gfp);
507 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
510 * Insert STA info into hash table/list, returns zero or a
511 * -EEXIST if (if the same MAC address is already present).
513 * Calling the non-rcu version makes the caller relinquish,
514 * the _rcu version calls read_lock_rcu() and must be called
517 int sta_info_insert(struct sta_info *sta);
518 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
520 int __must_check __sta_info_destroy(struct sta_info *sta);
521 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
523 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
526 void sta_info_recalc_tim(struct sta_info *sta);
528 void sta_info_init(struct ieee80211_local *local);
529 void sta_info_stop(struct ieee80211_local *local);
530 int sta_info_flush(struct ieee80211_local *local,
531 struct ieee80211_sub_if_data *sdata);
532 void sta_set_rate_info_tx(struct sta_info *sta,
533 const struct ieee80211_tx_rate *rate,
534 struct rate_info *rinfo);
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);
540 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
542 #endif /* STA_INFO_H */