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.
47 enum ieee80211_sta_info_flags {
49 WLAN_STA_ASSOC = 1<<1,
50 WLAN_STA_PS_STA = 1<<2,
51 WLAN_STA_AUTHORIZED = 1<<3,
52 WLAN_STA_SHORT_PREAMBLE = 1<<4,
53 WLAN_STA_ASSOC_AP = 1<<5,
56 WLAN_STA_CLEAR_PS_FILT = 1<<9,
58 WLAN_STA_BLOCK_BA = 1<<11,
59 WLAN_STA_PS_DRIVER = 1<<12,
60 WLAN_STA_PSPOLL = 1<<13,
63 #define STA_TID_NUM 16
64 #define ADDBA_RESP_INTERVAL HZ
65 #define HT_AGG_MAX_RETRIES 0x3
67 #define HT_AGG_STATE_DRV_READY 0
68 #define HT_AGG_STATE_RESPONSE_RECEIVED 1
69 #define HT_AGG_STATE_OPERATIONAL 2
70 #define HT_AGG_STATE_STOPPING 3
71 #define HT_AGG_STATE_WANT_START 4
72 #define HT_AGG_STATE_WANT_STOP 5
75 * struct tid_ampdu_tx - TID aggregation information (Tx).
77 * @rcu_head: rcu head for freeing structure
78 * @addba_resp_timer: timer for peer's response to addba request
79 * @pending: pending frames queue -- use sta's spinlock to protect
80 * @dialog_token: dialog token for aggregation session
81 * @timeout: session timeout value to be filled in ADDBA requests
82 * @state: session state (see above)
83 * @stop_initiator: initiator of a session stop
84 * @tx_stop: TX DelBA frame when stopping
86 * This structure's lifetime is managed by RCU, assignments to
87 * the array holding it must hold the aggregation mutex.
89 * The TX path can access it under RCU lock-free if, and
90 * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
91 * set. Otherwise, the TX path must also acquire the spinlock
92 * and re-check the state, see comments in the tx code
96 struct rcu_head rcu_head;
97 struct timer_list addba_resp_timer;
98 struct sk_buff_head pending;
107 * struct tid_ampdu_rx - TID aggregation information (Rx).
109 * @reorder_buf: buffer to reorder incoming aggregated MPDUs
110 * @reorder_time: jiffies when skb was added
111 * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
112 * @reorder_timer: releases expired frames from the reorder buffer.
113 * @head_seq_num: head sequence number in reordering buffer.
114 * @stored_mpdu_num: number of MPDUs in reordering buffer
115 * @ssn: Starting Sequence Number expected to be aggregated.
116 * @buf_size: buffer size for incoming A-MPDUs
117 * @timeout: reset timer value (in TUs).
118 * @dialog_token: dialog token for aggregation session
119 * @rcu_head: RCU head used for freeing this struct
120 * @reorder_lock: serializes access to reorder buffer, see below.
122 * This structure's lifetime is managed by RCU, assignments to
123 * the array holding it must hold the aggregation mutex.
125 * The @reorder_lock is used to protect the members of this
126 * struct, except for @timeout, @buf_size and @dialog_token,
127 * which are constant across the lifetime of the struct (the
128 * dialog token being used only for debugging).
130 struct tid_ampdu_rx {
131 struct rcu_head rcu_head;
132 spinlock_t reorder_lock;
133 struct sk_buff **reorder_buf;
134 unsigned long *reorder_time;
135 struct timer_list session_timer;
136 struct timer_list reorder_timer;
146 * struct sta_ampdu_mlme - STA aggregation information.
148 * @tid_rx: aggregation info for Rx per TID -- RCU protected
149 * @tid_tx: aggregation info for Tx per TID
150 * @addba_req_num: number of times addBA request has been sent.
151 * @dialog_token_allocator: dialog token enumerator for each new session;
152 * @work: work struct for starting/stopping aggregation
153 * @tid_rx_timer_expired: bitmap indicating on which TIDs the
154 * RX timer expired until the work for it runs
155 * @mtx: mutex to protect all TX data (except non-NULL assignments
156 * to tid_tx[idx], which are protected by the sta spinlock)
158 struct sta_ampdu_mlme {
161 struct tid_ampdu_rx *tid_rx[STA_TID_NUM];
162 unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
164 struct work_struct work;
165 struct tid_ampdu_tx *tid_tx[STA_TID_NUM];
166 u8 addba_req_num[STA_TID_NUM];
167 u8 dialog_token_allocator;
172 * enum plink_state - state of a mesh peer link finite state machine
174 * @PLINK_LISTEN: initial state, considered the implicit state of non existant
176 * @PLINK_OPN_SNT: mesh plink open frame has been sent to this mesh peer
177 * @PLINK_OPN_RCVD: mesh plink open frame has been received from this mesh peer
178 * @PLINK_CNF_RCVD: mesh plink confirm frame has been received from this mesh
180 * @PLINK_ESTAB: mesh peer link is established
181 * @PLINK_HOLDING: mesh peer link is being closed or cancelled
182 * @PLINK_BLOCKED: all frames transmitted from this mesh plink are discarded
195 * struct sta_info - STA information
197 * This structure collects information about a station that
198 * mac80211 is communicating with.
200 * @list: global linked list entry
201 * @hnext: hash table linked list pointer
202 * @local: pointer to the global information
203 * @sdata: virtual interface this station belongs to
204 * @ptk: peer key negotiated with this station, if any
205 * @gtk: group keys negotiated with this station, if any
206 * @rate_ctrl: rate control algorithm reference
207 * @rate_ctrl_priv: rate control private per-STA pointer
208 * @last_tx_rate: rate used for last transmit, to report to userspace as
209 * "the" transmit rate
210 * @lock: used for locking all fields that require locking, see comments
211 * in the header file.
212 * @flaglock: spinlock for flags accesses
213 * @drv_unblock_wk: used for driver PS unblocking
214 * @listen_interval: listen interval of this station, when we're acting as AP
215 * @flags: STA flags, see &enum ieee80211_sta_info_flags
216 * @ps_tx_buf: buffer of frames to transmit to this station
217 * when it leaves power saving state
218 * @tx_filtered: buffer of frames we already tried to transmit
219 * but were filtered by hardware due to STA having entered
221 * @rx_packets: Number of MSDUs received from this STA
222 * @rx_bytes: Number of bytes received from this STA
223 * @wep_weak_iv_count: number of weak WEP IVs received from this station
224 * @last_rx: time (in jiffies) when last frame was received from this STA
225 * @num_duplicates: number of duplicate frames received from this STA
226 * @rx_fragments: number of received MPDUs
227 * @rx_dropped: number of dropped MPDUs from this STA
228 * @last_signal: signal of last received frame from this STA
229 * @avg_signal: moving average of signal of received frames from this STA
230 * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
231 * @tx_filtered_count: number of frames the hardware filtered for this STA
232 * @tx_retry_failed: number of frames that failed retry
233 * @tx_retry_count: total number of retries for frames to this STA
234 * @fail_avg: moving percentage of failed MSDUs
235 * @tx_packets: number of RX/TX MSDUs
236 * @tx_bytes: number of bytes transmitted to this STA
237 * @tx_fragments: number of transmitted MPDUs
238 * @tid_seq: per-TID sequence numbers for sending to this STA
239 * @ampdu_mlme: A-MPDU state machine state
240 * @timer_to_tid: identity mapping to ID timers
241 * @llid: Local link ID
242 * @plid: Peer link ID
243 * @reason: Cancel reason on PLINK_HOLDING state
244 * @plink_retries: Retries in establishment
245 * @ignore_plink_timer: ignore the peer-link timer (used internally)
246 * @plink_state: peer link state
247 * @plink_timeout: timeout of peer link
248 * @plink_timer: peer link watch timer
249 * @plink_timer_was_running: used by suspend/resume to restore timers
250 * @debugfs: debug filesystem info
251 * @sta: station information we share with the driver
252 * @dead: set to true when sta is unlinked
253 * @uploaded: set to true when sta is uploaded to the driver
254 * @lost_packets: number of consecutive lost packets
257 /* General information, mostly static */
258 struct list_head list;
259 struct sta_info *hnext;
260 struct ieee80211_local *local;
261 struct ieee80211_sub_if_data *sdata;
262 struct ieee80211_key *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
263 struct ieee80211_key *ptk;
264 struct rate_control_ref *rate_ctrl;
265 void *rate_ctrl_priv;
269 struct work_struct drv_unblock_wk;
278 * frequently updated, locked with own spinlock (flaglock),
279 * use the accessors defined below
284 * STA powersave frame queues, no more than the internal
287 struct sk_buff_head ps_tx_buf;
288 struct sk_buff_head tx_filtered;
290 /* Updated from RX path only, no locking requirements */
291 unsigned long rx_packets, rx_bytes;
292 unsigned long wep_weak_iv_count;
293 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 __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
301 /* Updated from TX status path only, no locking requirements */
302 unsigned long tx_filtered_count;
303 unsigned long tx_retry_failed, tx_retry_count;
304 /* moving percentage of failed MSDUs */
305 unsigned int fail_avg;
307 /* Updated from TX path only, no locking requirements */
308 unsigned long tx_packets;
309 unsigned long tx_bytes;
310 unsigned long tx_fragments;
311 struct ieee80211_tx_rate last_tx_rate;
312 u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
315 * Aggregation information, locked with lock.
317 struct sta_ampdu_mlme ampdu_mlme;
318 u8 timer_to_tid[STA_TID_NUM];
320 #ifdef CONFIG_MAC80211_MESH
322 * Mesh peer link attributes
323 * TODO: move to a sub-structure that is referenced with pointer?
329 bool ignore_plink_timer;
330 bool plink_timer_was_running;
331 enum plink_state plink_state;
333 struct timer_list plink_timer;
336 #ifdef CONFIG_MAC80211_DEBUGFS
337 struct sta_info_debugfsdentries {
343 unsigned int lost_packets;
346 struct ieee80211_sta sta;
349 static inline enum plink_state sta_plink_state(struct sta_info *sta)
351 #ifdef CONFIG_MAC80211_MESH
352 return sta->plink_state;
357 static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
361 spin_lock_irqsave(&sta->flaglock, irqfl);
363 spin_unlock_irqrestore(&sta->flaglock, irqfl);
366 static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
370 spin_lock_irqsave(&sta->flaglock, irqfl);
371 sta->flags &= ~flags;
372 spin_unlock_irqrestore(&sta->flaglock, irqfl);
375 static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
380 spin_lock_irqsave(&sta->flaglock, irqfl);
381 ret = sta->flags & flags;
382 spin_unlock_irqrestore(&sta->flaglock, irqfl);
387 static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
393 spin_lock_irqsave(&sta->flaglock, irqfl);
394 ret = sta->flags & flags;
395 sta->flags &= ~flags;
396 spin_unlock_irqrestore(&sta->flaglock, irqfl);
401 static inline u32 get_sta_flags(struct sta_info *sta)
406 spin_lock_irqsave(&sta->flaglock, irqfl);
408 spin_unlock_irqrestore(&sta->flaglock, irqfl);
415 #define STA_HASH_SIZE 256
416 #define STA_HASH(sta) (sta[5])
419 /* Maximum number of frames to buffer per power saving station */
420 #define STA_MAX_TX_BUFFER 128
422 /* Minimum buffered frame expiry time. If STA uses listen interval that is
423 * smaller than this value, the minimum value here is used instead. */
424 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
426 /* How often station data is cleaned up (e.g., expiration of buffered frames)
428 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
431 * Get a STA info, must be under RCU read lock.
433 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
436 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
440 void for_each_sta_info_type_check(struct ieee80211_local *local,
442 struct sta_info *sta,
443 struct sta_info *nxt)
447 #define for_each_sta_info(local, _addr, _sta, nxt) \
448 for ( /* initialise loop */ \
449 _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
450 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
452 for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
453 /* continue condition */ \
457 nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
459 /* compare address and run code only if it matches */ \
460 if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)
463 * Get STA info by index, BROKEN!
465 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
468 * Create a new STA info, caller owns returned structure
469 * until sta_info_insert().
471 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
472 u8 *addr, gfp_t gfp);
474 * Insert STA info into hash table/list, returns zero or a
475 * -EEXIST if (if the same MAC address is already present).
477 * Calling the non-rcu version makes the caller relinquish,
478 * the _rcu version calls read_lock_rcu() and must be called
481 int sta_info_insert(struct sta_info *sta);
482 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
483 int sta_info_insert_atomic(struct sta_info *sta);
485 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
487 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
490 void sta_info_set_tim_bit(struct sta_info *sta);
491 void sta_info_clear_tim_bit(struct sta_info *sta);
493 void sta_info_init(struct ieee80211_local *local);
494 int sta_info_start(struct ieee80211_local *local);
495 void sta_info_stop(struct ieee80211_local *local);
496 int sta_info_flush(struct ieee80211_local *local,
497 struct ieee80211_sub_if_data *sdata);
498 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
499 unsigned long exp_time);
501 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
502 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
504 #endif /* STA_INFO_H */