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
83 * This structure is protected by RCU and the per-station
84 * spinlock. Assignments to the array holding it must hold
85 * the spinlock, only the TX path can access it under RCU
86 * lock-free if, and only if, the state has the flag
87 * %HT_AGG_STATE_OPERATIONAL set. Otherwise, the TX path
88 * must also acquire the spinlock and re-check the state,
89 * see comments in the tx code touching it.
92 struct rcu_head rcu_head;
93 struct timer_list addba_resp_timer;
94 struct sk_buff_head pending;
101 * struct tid_ampdu_rx - TID aggregation information (Rx).
103 * @reorder_buf: buffer to reorder incoming aggregated MPDUs
104 * @reorder_time: jiffies when skb was added
105 * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
106 * @head_seq_num: head sequence number in reordering buffer.
107 * @stored_mpdu_num: number of MPDUs in reordering buffer
108 * @ssn: Starting Sequence Number expected to be aggregated.
109 * @buf_size: buffer size for incoming A-MPDUs
110 * @timeout: reset timer value (in TUs).
111 * @dialog_token: dialog token for aggregation session
112 * @rcu_head: RCU head used for freeing this struct
114 * This structure is protected by RCU and the per-station
115 * spinlock. Assignments to the array holding it must hold
116 * the spinlock, only the RX path can access it under RCU
117 * lock-free. The RX path, since it is single-threaded,
118 * can even modify the structure without locking since the
119 * only other modifications to it are done when the struct
120 * can not yet or no longer be found by the RX path.
122 struct tid_ampdu_rx {
123 struct rcu_head rcu_head;
124 struct sk_buff **reorder_buf;
125 unsigned long *reorder_time;
126 struct timer_list session_timer;
136 * struct sta_ampdu_mlme - STA aggregation information.
138 * @tid_rx: aggregation info for Rx per TID -- RCU protected
139 * @tid_tx: aggregation info for Tx per TID
140 * @addba_req_num: number of times addBA request has been sent.
141 * @dialog_token_allocator: dialog token enumerator for each new session;
142 * @work: work struct for starting/stopping aggregation
144 struct sta_ampdu_mlme {
146 struct tid_ampdu_rx *tid_rx[STA_TID_NUM];
148 struct work_struct work;
149 struct tid_ampdu_tx *tid_tx[STA_TID_NUM];
150 u8 addba_req_num[STA_TID_NUM];
151 u8 dialog_token_allocator;
156 * enum plink_state - state of a mesh peer link finite state machine
158 * @PLINK_LISTEN: initial state, considered the implicit state of non existant
160 * @PLINK_OPN_SNT: mesh plink open frame has been sent to this mesh peer
161 * @PLINK_OPN_RCVD: mesh plink open frame has been received from this mesh peer
162 * @PLINK_CNF_RCVD: mesh plink confirm frame has been received from this mesh
164 * @PLINK_ESTAB: mesh peer link is established
165 * @PLINK_HOLDING: mesh peer link is being closed or cancelled
166 * @PLINK_BLOCKED: all frames transmitted from this mesh plink are discarded
179 * struct sta_info - STA information
181 * This structure collects information about a station that
182 * mac80211 is communicating with.
184 * @list: global linked list entry
185 * @hnext: hash table linked list pointer
186 * @local: pointer to the global information
187 * @sdata: virtual interface this station belongs to
188 * @key: peer key negotiated with this station, if any
189 * @rate_ctrl: rate control algorithm reference
190 * @rate_ctrl_priv: rate control private per-STA pointer
191 * @last_tx_rate: rate used for last transmit, to report to userspace as
192 * "the" transmit rate
193 * @lock: used for locking all fields that require locking, see comments
194 * in the header file.
195 * @flaglock: spinlock for flags accesses
196 * @drv_unblock_wk: used for driver PS unblocking
197 * @listen_interval: listen interval of this station, when we're acting as AP
198 * @flags: STA flags, see &enum ieee80211_sta_info_flags
199 * @ps_tx_buf: buffer of frames to transmit to this station
200 * when it leaves power saving state
201 * @tx_filtered: buffer of frames we already tried to transmit
202 * but were filtered by hardware due to STA having entered
204 * @rx_packets: Number of MSDUs received from this STA
205 * @rx_bytes: Number of bytes received from this STA
206 * @wep_weak_iv_count: number of weak WEP IVs received from this station
207 * @last_rx: time (in jiffies) when last frame was received from this STA
208 * @num_duplicates: number of duplicate frames received from this STA
209 * @rx_fragments: number of received MPDUs
210 * @rx_dropped: number of dropped MPDUs from this STA
211 * @last_signal: signal of last received frame from this STA
212 * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
213 * @tx_filtered_count: number of frames the hardware filtered for this STA
214 * @tx_retry_failed: number of frames that failed retry
215 * @tx_retry_count: total number of retries for frames to this STA
216 * @fail_avg: moving percentage of failed MSDUs
217 * @tx_packets: number of RX/TX MSDUs
218 * @tx_bytes: number of bytes transmitted to this STA
219 * @tx_fragments: number of transmitted MPDUs
220 * @tid_seq: per-TID sequence numbers for sending to this STA
221 * @ampdu_mlme: A-MPDU state machine state
222 * @timer_to_tid: identity mapping to ID timers
223 * @llid: Local link ID
224 * @plid: Peer link ID
225 * @reason: Cancel reason on PLINK_HOLDING state
226 * @plink_retries: Retries in establishment
227 * @ignore_plink_timer: ignore the peer-link timer (used internally)
228 * @plink_state: peer link state
229 * @plink_timeout: timeout of peer link
230 * @plink_timer: peer link watch timer
231 * @plink_timer_was_running: used by suspend/resume to restore timers
232 * @debugfs: debug filesystem info
233 * @sta: station information we share with the driver
234 * @dead: set to true when sta is unlinked
235 * @uploaded: set to true when sta is uploaded to the driver
238 /* General information, mostly static */
239 struct list_head list;
240 struct sta_info *hnext;
241 struct ieee80211_local *local;
242 struct ieee80211_sub_if_data *sdata;
243 struct ieee80211_key *key;
244 struct rate_control_ref *rate_ctrl;
245 void *rate_ctrl_priv;
249 struct work_struct drv_unblock_wk;
258 * frequently updated, locked with own spinlock (flaglock),
259 * use the accessors defined below
264 * STA powersave frame queues, no more than the internal
267 struct sk_buff_head ps_tx_buf;
268 struct sk_buff_head tx_filtered;
270 /* Updated from RX path only, no locking requirements */
271 unsigned long rx_packets, rx_bytes;
272 unsigned long wep_weak_iv_count;
273 unsigned long last_rx;
274 unsigned long num_duplicates;
275 unsigned long rx_fragments;
276 unsigned long rx_dropped;
278 __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
280 /* Updated from TX status path only, no locking requirements */
281 unsigned long tx_filtered_count;
282 unsigned long tx_retry_failed, tx_retry_count;
283 /* moving percentage of failed MSDUs */
284 unsigned int fail_avg;
286 /* Updated from TX path only, no locking requirements */
287 unsigned long tx_packets;
288 unsigned long tx_bytes;
289 unsigned long tx_fragments;
290 struct ieee80211_tx_rate last_tx_rate;
291 u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
294 * Aggregation information, locked with lock.
296 struct sta_ampdu_mlme ampdu_mlme;
297 u8 timer_to_tid[STA_TID_NUM];
299 #ifdef CONFIG_MAC80211_MESH
301 * Mesh peer link attributes
302 * TODO: move to a sub-structure that is referenced with pointer?
308 bool ignore_plink_timer;
309 bool plink_timer_was_running;
310 enum plink_state plink_state;
312 struct timer_list plink_timer;
315 #ifdef CONFIG_MAC80211_DEBUGFS
316 struct sta_info_debugfsdentries {
323 struct ieee80211_sta sta;
326 static inline enum plink_state sta_plink_state(struct sta_info *sta)
328 #ifdef CONFIG_MAC80211_MESH
329 return sta->plink_state;
334 static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
338 spin_lock_irqsave(&sta->flaglock, irqfl);
340 spin_unlock_irqrestore(&sta->flaglock, irqfl);
343 static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
347 spin_lock_irqsave(&sta->flaglock, irqfl);
348 sta->flags &= ~flags;
349 spin_unlock_irqrestore(&sta->flaglock, irqfl);
352 static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
357 spin_lock_irqsave(&sta->flaglock, irqfl);
358 ret = sta->flags & flags;
359 spin_unlock_irqrestore(&sta->flaglock, irqfl);
364 static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
370 spin_lock_irqsave(&sta->flaglock, irqfl);
371 ret = sta->flags & flags;
372 sta->flags &= ~flags;
373 spin_unlock_irqrestore(&sta->flaglock, irqfl);
378 static inline u32 get_sta_flags(struct sta_info *sta)
383 spin_lock_irqsave(&sta->flaglock, irqfl);
385 spin_unlock_irqrestore(&sta->flaglock, irqfl);
392 #define STA_HASH_SIZE 256
393 #define STA_HASH(sta) (sta[5])
396 /* Maximum number of frames to buffer per power saving station */
397 #define STA_MAX_TX_BUFFER 128
399 /* Minimum buffered frame expiry time. If STA uses listen interval that is
400 * smaller than this value, the minimum value here is used instead. */
401 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
403 /* How often station data is cleaned up (e.g., expiration of buffered frames)
405 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
408 * Get a STA info, must be under RCU read lock.
410 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
413 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
417 void for_each_sta_info_type_check(struct ieee80211_local *local,
419 struct sta_info *sta,
420 struct sta_info *nxt)
424 #define for_each_sta_info(local, _addr, sta, nxt) \
425 for ( /* initialise loop */ \
426 sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
427 nxt = sta ? rcu_dereference(sta->hnext) : NULL; \
429 for_each_sta_info_type_check(local, (_addr), sta, nxt), \
430 /* continue condition */ \
434 nxt = sta ? rcu_dereference(sta->hnext) : NULL \
436 /* compare address and run code only if it matches */ \
437 if (memcmp(sta->sta.addr, (_addr), ETH_ALEN) == 0)
440 * Get STA info by index, BROKEN!
442 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
445 * Create a new STA info, caller owns returned structure
446 * until sta_info_insert().
448 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
449 u8 *addr, gfp_t gfp);
451 * Insert STA info into hash table/list, returns zero or a
452 * -EEXIST if (if the same MAC address is already present).
454 * Calling the non-rcu version makes the caller relinquish,
455 * the _rcu version calls read_lock_rcu() and must be called
458 int sta_info_insert(struct sta_info *sta);
459 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
460 int sta_info_insert_atomic(struct sta_info *sta);
462 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
464 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
467 void sta_info_set_tim_bit(struct sta_info *sta);
468 void sta_info_clear_tim_bit(struct sta_info *sta);
470 void sta_info_init(struct ieee80211_local *local);
471 int sta_info_start(struct ieee80211_local *local);
472 void sta_info_stop(struct ieee80211_local *local);
473 int sta_info_flush(struct ieee80211_local *local,
474 struct ieee80211_sub_if_data *sdata);
475 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
476 unsigned long exp_time);
478 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
479 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
481 #endif /* STA_INFO_H */