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>
19 * enum ieee80211_sta_info_flags - Stations flags
21 * These flags are used with &struct sta_info's @flags member.
23 * @WLAN_STA_AUTH: Station is authenticated.
24 * @WLAN_STA_ASSOC: Station is associated.
25 * @WLAN_STA_PS_STA: Station is in power-save mode
26 * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
27 * This bit is always checked so needs to be enabled for all stations
28 * when virtual port control is not in use.
29 * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
31 * @WLAN_STA_ASSOC_AP: We're associated to that station, it is an AP.
32 * @WLAN_STA_WME: Station is a QoS-STA.
33 * @WLAN_STA_WDS: Station is one of our WDS peers.
34 * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
35 * IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
36 * frame to this station is transmitted.
37 * @WLAN_STA_MFP: Management frame protection is used with this STA.
38 * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
39 * during suspend/resume and station removal.
40 * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
41 * power-save mode logically to flush frames that might still
43 * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
44 * station in power-save mode, reply when the driver unblocks.
46 enum ieee80211_sta_info_flags {
48 WLAN_STA_ASSOC = 1<<1,
49 WLAN_STA_PS_STA = 1<<2,
50 WLAN_STA_AUTHORIZED = 1<<3,
51 WLAN_STA_SHORT_PREAMBLE = 1<<4,
52 WLAN_STA_ASSOC_AP = 1<<5,
55 WLAN_STA_CLEAR_PS_FILT = 1<<9,
57 WLAN_STA_BLOCK_BA = 1<<11,
58 WLAN_STA_PS_DRIVER = 1<<12,
59 WLAN_STA_PSPOLL = 1<<13,
62 #define STA_TID_NUM 16
63 #define ADDBA_RESP_INTERVAL HZ
64 #define HT_AGG_MAX_RETRIES 0x3
66 #define HT_AGG_STATE_DRV_READY 0
67 #define HT_AGG_STATE_RESPONSE_RECEIVED 1
68 #define HT_AGG_STATE_OPERATIONAL 2
69 #define HT_AGG_STATE_STOPPING 3
70 #define HT_AGG_STATE_WANT_START 4
71 #define HT_AGG_STATE_WANT_STOP 5
74 * struct tid_ampdu_tx - TID aggregation information (Tx).
76 * @rcu_head: rcu head for freeing structure
77 * @addba_resp_timer: timer for peer's response to addba request
78 * @pending: pending frames queue -- use sta's spinlock to protect
79 * @dialog_token: dialog token for aggregation session
80 * @state: session state (see above)
81 * @stop_initiator: initiator of a session stop
82 * @tx_stop: TX DelBA frame when stopping
84 * This structure is protected by RCU and the per-station
85 * spinlock. Assignments to the array holding it must hold
86 * the spinlock, only the TX path can access it under RCU
87 * lock-free if, and only if, the state has the flag
88 * %HT_AGG_STATE_OPERATIONAL set. Otherwise, the TX path
89 * must also acquire the spinlock and re-check the state,
90 * see comments in the tx code touching it.
93 struct rcu_head rcu_head;
94 struct timer_list addba_resp_timer;
95 struct sk_buff_head pending;
103 * struct tid_ampdu_rx - TID aggregation information (Rx).
105 * @reorder_buf: buffer to reorder incoming aggregated MPDUs
106 * @reorder_time: jiffies when skb was added
107 * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
108 * @reorder_timer: releases expired frames from the reorder buffer.
109 * @head_seq_num: head sequence number in reordering buffer.
110 * @stored_mpdu_num: number of MPDUs in reordering buffer
111 * @ssn: Starting Sequence Number expected to be aggregated.
112 * @buf_size: buffer size for incoming A-MPDUs
113 * @timeout: reset timer value (in TUs).
114 * @dialog_token: dialog token for aggregation session
115 * @rcu_head: RCU head used for freeing this struct
116 * @reorder_lock: serializes access to reorder buffer, see below.
118 * This structure is protected by RCU and the per-station
119 * spinlock. Assignments to the array holding it must hold
122 * The @reorder_lock is used to protect the variables and
123 * arrays such as @reorder_buf, @reorder_time, @head_seq_num,
124 * @stored_mpdu_num and @reorder_time from being corrupted by
125 * concurrent access of the RX path and the expired frame
128 struct tid_ampdu_rx {
129 struct rcu_head rcu_head;
130 spinlock_t reorder_lock;
131 struct sk_buff **reorder_buf;
132 unsigned long *reorder_time;
133 struct timer_list session_timer;
134 struct timer_list reorder_timer;
144 * struct sta_ampdu_mlme - STA aggregation information.
146 * @tid_rx: aggregation info for Rx per TID -- RCU protected
147 * @tid_tx: aggregation info for Tx per TID
148 * @addba_req_num: number of times addBA request has been sent.
149 * @dialog_token_allocator: dialog token enumerator for each new session;
150 * @work: work struct for starting/stopping aggregation
151 * @tid_rx_timer_expired: bitmap indicating on which TIDs the
152 * RX timer expired until the work for it runs
153 * @mtx: mutex to protect all TX data (except non-NULL assignments
154 * to tid_tx[idx], which are protected by the sta spinlock)
156 struct sta_ampdu_mlme {
159 struct tid_ampdu_rx *tid_rx[STA_TID_NUM];
160 unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
162 struct work_struct work;
163 struct tid_ampdu_tx *tid_tx[STA_TID_NUM];
164 u8 addba_req_num[STA_TID_NUM];
165 u8 dialog_token_allocator;
170 * enum plink_state - state of a mesh peer link finite state machine
172 * @PLINK_LISTEN: initial state, considered the implicit state of non existant
174 * @PLINK_OPN_SNT: mesh plink open frame has been sent to this mesh peer
175 * @PLINK_OPN_RCVD: mesh plink open frame has been received from this mesh peer
176 * @PLINK_CNF_RCVD: mesh plink confirm frame has been received from this mesh
178 * @PLINK_ESTAB: mesh peer link is established
179 * @PLINK_HOLDING: mesh peer link is being closed or cancelled
180 * @PLINK_BLOCKED: all frames transmitted from this mesh plink are discarded
193 * struct sta_info - STA information
195 * This structure collects information about a station that
196 * mac80211 is communicating with.
198 * @list: global linked list entry
199 * @hnext: hash table linked list pointer
200 * @local: pointer to the global information
201 * @sdata: virtual interface this station belongs to
202 * @ptk: peer key negotiated with this station, if any
203 * @gtk: group keys negotiated with this station, if any
204 * @rate_ctrl: rate control algorithm reference
205 * @rate_ctrl_priv: rate control private per-STA pointer
206 * @last_tx_rate: rate used for last transmit, to report to userspace as
207 * "the" transmit rate
208 * @lock: used for locking all fields that require locking, see comments
209 * in the header file.
210 * @flaglock: spinlock for flags accesses
211 * @drv_unblock_wk: used for driver PS unblocking
212 * @listen_interval: listen interval of this station, when we're acting as AP
213 * @flags: STA flags, see &enum ieee80211_sta_info_flags
214 * @ps_tx_buf: buffer of frames to transmit to this station
215 * when it leaves power saving state
216 * @tx_filtered: buffer of frames we already tried to transmit
217 * but were filtered by hardware due to STA having entered
219 * @rx_packets: Number of MSDUs received from this STA
220 * @rx_bytes: Number of bytes received from this STA
221 * @wep_weak_iv_count: number of weak WEP IVs received from this station
222 * @last_rx: time (in jiffies) when last frame was received from this STA
223 * @num_duplicates: number of duplicate frames received from this STA
224 * @rx_fragments: number of received MPDUs
225 * @rx_dropped: number of dropped MPDUs from this STA
226 * @last_signal: signal of last received frame 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 * @sta: station information we share with the driver
249 * @dead: set to true when sta is unlinked
250 * @uploaded: set to true when sta is uploaded to the driver
253 /* General information, mostly static */
254 struct list_head list;
255 struct sta_info *hnext;
256 struct ieee80211_local *local;
257 struct ieee80211_sub_if_data *sdata;
258 struct ieee80211_key *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
259 struct ieee80211_key *ptk;
260 struct rate_control_ref *rate_ctrl;
261 void *rate_ctrl_priv;
265 struct work_struct drv_unblock_wk;
274 * frequently updated, locked with own spinlock (flaglock),
275 * use the accessors defined below
280 * STA powersave frame queues, no more than the internal
283 struct sk_buff_head ps_tx_buf;
284 struct sk_buff_head tx_filtered;
286 /* Updated from RX path only, no locking requirements */
287 unsigned long rx_packets, rx_bytes;
288 unsigned long wep_weak_iv_count;
289 unsigned long last_rx;
290 unsigned long num_duplicates;
291 unsigned long rx_fragments;
292 unsigned long rx_dropped;
294 __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
296 /* Updated from TX status path only, no locking requirements */
297 unsigned long tx_filtered_count;
298 unsigned long tx_retry_failed, tx_retry_count;
299 /* moving percentage of failed MSDUs */
300 unsigned int fail_avg;
302 /* Updated from TX path only, no locking requirements */
303 unsigned long tx_packets;
304 unsigned long tx_bytes;
305 unsigned long tx_fragments;
306 struct ieee80211_tx_rate last_tx_rate;
307 u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
310 * Aggregation information, locked with lock.
312 struct sta_ampdu_mlme ampdu_mlme;
313 u8 timer_to_tid[STA_TID_NUM];
315 #ifdef CONFIG_MAC80211_MESH
317 * Mesh peer link attributes
318 * TODO: move to a sub-structure that is referenced with pointer?
324 bool ignore_plink_timer;
325 bool plink_timer_was_running;
326 enum plink_state plink_state;
328 struct timer_list plink_timer;
331 #ifdef CONFIG_MAC80211_DEBUGFS
332 struct sta_info_debugfsdentries {
339 struct ieee80211_sta sta;
342 static inline enum plink_state sta_plink_state(struct sta_info *sta)
344 #ifdef CONFIG_MAC80211_MESH
345 return sta->plink_state;
350 static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
354 spin_lock_irqsave(&sta->flaglock, irqfl);
356 spin_unlock_irqrestore(&sta->flaglock, irqfl);
359 static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
363 spin_lock_irqsave(&sta->flaglock, irqfl);
364 sta->flags &= ~flags;
365 spin_unlock_irqrestore(&sta->flaglock, irqfl);
368 static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
373 spin_lock_irqsave(&sta->flaglock, irqfl);
374 ret = sta->flags & flags;
375 spin_unlock_irqrestore(&sta->flaglock, irqfl);
380 static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
386 spin_lock_irqsave(&sta->flaglock, irqfl);
387 ret = sta->flags & flags;
388 sta->flags &= ~flags;
389 spin_unlock_irqrestore(&sta->flaglock, irqfl);
394 static inline u32 get_sta_flags(struct sta_info *sta)
399 spin_lock_irqsave(&sta->flaglock, irqfl);
401 spin_unlock_irqrestore(&sta->flaglock, irqfl);
408 #define STA_HASH_SIZE 256
409 #define STA_HASH(sta) (sta[5])
412 /* Maximum number of frames to buffer per power saving station */
413 #define STA_MAX_TX_BUFFER 128
415 /* Minimum buffered frame expiry time. If STA uses listen interval that is
416 * smaller than this value, the minimum value here is used instead. */
417 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
419 /* How often station data is cleaned up (e.g., expiration of buffered frames)
421 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
424 * Get a STA info, must be under RCU read lock.
426 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
429 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
433 void for_each_sta_info_type_check(struct ieee80211_local *local,
435 struct sta_info *sta,
436 struct sta_info *nxt)
440 #define for_each_sta_info(local, _addr, _sta, nxt) \
441 for ( /* initialise loop */ \
442 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
443 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
445 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
446 /* continue condition */ \
450 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
452 /* compare address and run code only if it matches */ \
453 if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)
456 * Get STA info by index, BROKEN!
458 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
461 * Create a new STA info, caller owns returned structure
462 * until sta_info_insert().
464 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
465 u8 *addr, gfp_t gfp);
467 * Insert STA info into hash table/list, returns zero or a
468 * -EEXIST if (if the same MAC address is already present).
470 * Calling the non-rcu version makes the caller relinquish,
471 * the _rcu version calls read_lock_rcu() and must be called
474 int sta_info_insert(struct sta_info *sta);
475 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
476 int sta_info_insert_atomic(struct sta_info *sta);
478 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
480 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
483 void sta_info_set_tim_bit(struct sta_info *sta);
484 void sta_info_clear_tim_bit(struct sta_info *sta);
486 void sta_info_init(struct ieee80211_local *local);
487 int sta_info_start(struct ieee80211_local *local);
488 void sta_info_stop(struct ieee80211_local *local);
489 int sta_info_flush(struct ieee80211_local *local,
490 struct ieee80211_sub_if_data *sdata);
491 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
492 unsigned long exp_time);
494 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
495 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
497 #endif /* STA_INFO_H */