summaryrefslogtreecommitdiff
path: root/net/mac80211/sta_info.h
blob: a06d64ebc1776bba755454d58a33e255eb5ebb56 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
/*
 * Copyright 2002-2005, Devicescape Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef STA_INFO_H
#define STA_INFO_H

#include <linux/list.h>
#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/workqueue.h>
#include <linux/average.h>
#include "key.h"

/**
 * enum ieee80211_sta_info_flags - Stations flags
 *
 * These flags are used with &struct sta_info's @flags member.
 *
 * @WLAN_STA_AUTH: Station is authenticated.
 * @WLAN_STA_ASSOC: Station is associated.
 * @WLAN_STA_PS_STA: Station is in power-save mode
 * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
 *	This bit is always checked so needs to be enabled for all stations
 *	when virtual port control is not in use.
 * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
 *	frames.
 * @WLAN_STA_ASSOC_AP: We're associated to that station, it is an AP.
 * @WLAN_STA_WME: Station is a QoS-STA.
 * @WLAN_STA_WDS: Station is one of our WDS peers.
 * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
 *	IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
 *	frame to this station is transmitted.
 * @WLAN_STA_MFP: Management frame protection is used with this STA.
 * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
 *	during suspend/resume and station removal.
 * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
 *	power-save mode logically to flush frames that might still
 *	be in the queues
 * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
 *	station in power-save mode, reply when the driver unblocks.
 * @WLAN_STA_PS_DRIVER_BUF: Station has frames pending in driver internal
 *	buffers. Automatically cleared on station wake-up.
 */
enum ieee80211_sta_info_flags {
	WLAN_STA_AUTH		= 1<<0,
	WLAN_STA_ASSOC		= 1<<1,
	WLAN_STA_PS_STA		= 1<<2,
	WLAN_STA_AUTHORIZED	= 1<<3,
	WLAN_STA_SHORT_PREAMBLE	= 1<<4,
	WLAN_STA_ASSOC_AP	= 1<<5,
	WLAN_STA_WME		= 1<<6,
	WLAN_STA_WDS		= 1<<7,
	WLAN_STA_CLEAR_PS_FILT	= 1<<9,
	WLAN_STA_MFP		= 1<<10,
	WLAN_STA_BLOCK_BA	= 1<<11,
	WLAN_STA_PS_DRIVER	= 1<<12,
	WLAN_STA_PSPOLL		= 1<<13,
	WLAN_STA_PS_DRIVER_BUF	= 1<<14,
};

#define STA_TID_NUM 16
#define ADDBA_RESP_INTERVAL HZ
#define HT_AGG_MAX_RETRIES		0x3

#define HT_AGG_STATE_DRV_READY		0
#define HT_AGG_STATE_RESPONSE_RECEIVED	1
#define HT_AGG_STATE_OPERATIONAL	2
#define HT_AGG_STATE_STOPPING		3
#define HT_AGG_STATE_WANT_START		4
#define HT_AGG_STATE_WANT_STOP		5

/**
 * struct tid_ampdu_tx - TID aggregation information (Tx).
 *
 * @rcu_head: rcu head for freeing structure
 * @addba_resp_timer: timer for peer's response to addba request
 * @pending: pending frames queue -- use sta's spinlock to protect
 * @dialog_token: dialog token for aggregation session
 * @timeout: session timeout value to be filled in ADDBA requests
 * @state: session state (see above)
 * @stop_initiator: initiator of a session stop
 * @tx_stop: TX DelBA frame when stopping
 * @buf_size: reorder buffer size at receiver
 *
 * This structure's lifetime is managed by RCU, assignments to
 * the array holding it must hold the aggregation mutex.
 *
 * The TX path can access it under RCU lock-free if, and
 * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
 * set. Otherwise, the TX path must also acquire the spinlock
 * and re-check the state, see comments in the tx code
 * touching it.
 */
struct tid_ampdu_tx {
	struct rcu_head rcu_head;
	struct timer_list addba_resp_timer;
	struct sk_buff_head pending;
	unsigned long state;
	u16 timeout;
	u8 dialog_token;
	u8 stop_initiator;
	bool tx_stop;
	u8 buf_size;
};

/**
 * struct tid_ampdu_rx - TID aggregation information (Rx).
 *
 * @reorder_buf: buffer to reorder incoming aggregated MPDUs
 * @reorder_time: jiffies when skb was added
 * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
 * @reorder_timer: releases expired frames from the reorder buffer.
 * @head_seq_num: head sequence number in reordering buffer.
 * @stored_mpdu_num: number of MPDUs in reordering buffer
 * @ssn: Starting Sequence Number expected to be aggregated.
 * @buf_size: buffer size for incoming A-MPDUs
 * @timeout: reset timer value (in TUs).
 * @dialog_token: dialog token for aggregation session
 * @rcu_head: RCU head used for freeing this struct
 * @reorder_lock: serializes access to reorder buffer, see below.
 *
 * This structure's lifetime is managed by RCU, assignments to
 * the array holding it must hold the aggregation mutex.
 *
 * The @reorder_lock is used to protect the members of this
 * struct, except for @timeout, @buf_size and @dialog_token,
 * which are constant across the lifetime of the struct (the
 * dialog token being used only for debugging).
 */
struct tid_ampdu_rx {
	struct rcu_head rcu_head;
	spinlock_t reorder_lock;
	struct sk_buff **reorder_buf;
	unsigned long *reorder_time;
	struct timer_list session_timer;
	struct timer_list reorder_timer;
	u16 head_seq_num;
	u16 stored_mpdu_num;
	u16 ssn;
	u16 buf_size;
	u16 timeout;
	u8 dialog_token;
};

/**
 * struct sta_ampdu_mlme - STA aggregation information.
 *
 * @tid_rx: aggregation info for Rx per TID -- RCU protected
 * @tid_tx: aggregation info for Tx per TID
 * @tid_start_tx: sessions where start was requested
 * @addba_req_num: number of times addBA request has been sent.
 * @dialog_token_allocator: dialog token enumerator for each new session;
 * @work: work struct for starting/stopping aggregation
 * @tid_rx_timer_expired: bitmap indicating on which TIDs the
 *	RX timer expired until the work for it runs
 * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
 *	driver requested to close until the work for it runs
 * @mtx: mutex to protect all TX data (except non-NULL assignments
 *	to tid_tx[idx], which are protected by the sta spinlock)
 */
struct sta_ampdu_mlme {
	struct mutex mtx;
	/* rx */
	struct tid_ampdu_rx __rcu *tid_rx[STA_TID_NUM];
	unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
	unsigned long tid_rx_stop_requested[BITS_TO_LONGS(STA_TID_NUM)];
	/* tx */
	struct work_struct work;
	struct tid_ampdu_tx __rcu *tid_tx[STA_TID_NUM];
	struct tid_ampdu_tx *tid_start_tx[STA_TID_NUM];
	u8 addba_req_num[STA_TID_NUM];
	u8 dialog_token_allocator;
};


/**
 * struct sta_info - STA information
 *
 * This structure collects information about a station that
 * mac80211 is communicating with.
 *
 * @list: global linked list entry
 * @hnext: hash table linked list pointer
 * @local: pointer to the global information
 * @sdata: virtual interface this station belongs to
 * @ptk: peer key negotiated with this station, if any
 * @gtk: group keys negotiated with this station, if any
 * @rate_ctrl: rate control algorithm reference
 * @rate_ctrl_priv: rate control private per-STA pointer
 * @last_tx_rate: rate used for last transmit, to report to userspace as
 *	"the" transmit rate
 * @last_rx_rate_idx: rx status rate index of the last data packet
 * @last_rx_rate_flag: rx status flag of the last data packet
 * @lock: used for locking all fields that require locking, see comments
 *	in the header file.
 * @flaglock: spinlock for flags accesses
 * @drv_unblock_wk: used for driver PS unblocking
 * @listen_interval: listen interval of this station, when we're acting as AP
 * @flags: STA flags, see &enum ieee80211_sta_info_flags
 * @ps_tx_buf: buffer of frames to transmit to this station
 *	when it leaves power saving state
 * @tx_filtered: buffer of frames we already tried to transmit
 *	but were filtered by hardware due to STA having entered
 *	power saving state
 * @rx_packets: Number of MSDUs received from this STA
 * @rx_bytes: Number of bytes received from this STA
 * @wep_weak_iv_count: number of weak WEP IVs received from this station
 * @last_rx: time (in jiffies) when last frame was received from this STA
 * @last_connected: time (in seconds) when a station got connected
 * @num_duplicates: number of duplicate frames received from this STA
 * @rx_fragments: number of received MPDUs
 * @rx_dropped: number of dropped MPDUs from this STA
 * @last_signal: signal of last received frame from this STA
 * @avg_signal: moving average of signal of received frames from this STA
 * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
 * @tx_filtered_count: number of frames the hardware filtered for this STA
 * @tx_retry_failed: number of frames that failed retry
 * @tx_retry_count: total number of retries for frames to this STA
 * @fail_avg: moving percentage of failed MSDUs
 * @tx_packets: number of RX/TX MSDUs
 * @tx_bytes: number of bytes transmitted to this STA
 * @tx_fragments: number of transmitted MPDUs
 * @tid_seq: per-TID sequence numbers for sending to this STA
 * @ampdu_mlme: A-MPDU state machine state
 * @timer_to_tid: identity mapping to ID timers
 * @llid: Local link ID
 * @plid: Peer link ID
 * @reason: Cancel reason on PLINK_HOLDING state
 * @plink_retries: Retries in establishment
 * @ignore_plink_timer: ignore the peer-link timer (used internally)
 * @plink_state: peer link state
 * @plink_timeout: timeout of peer link
 * @plink_timer: peer link watch timer
 * @plink_timer_was_running: used by suspend/resume to restore timers
 * @debugfs: debug filesystem info
 * @sta: station information we share with the driver
 * @dead: set to true when sta is unlinked
 * @uploaded: set to true when sta is uploaded to the driver
 * @lost_packets: number of consecutive lost packets
 */
struct sta_info {
	/* General information, mostly static */
	struct list_head list;
	struct sta_info __rcu *hnext;
	struct ieee80211_local *local;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
	struct ieee80211_key __rcu *ptk;
	struct rate_control_ref *rate_ctrl;
	void *rate_ctrl_priv;
	spinlock_t lock;
	spinlock_t flaglock;

	struct work_struct drv_unblock_wk;

	u16 listen_interval;

	bool dead;

	bool uploaded;

	/*
	 * frequently updated, locked with own spinlock (flaglock),
	 * use the accessors defined below
	 */
	u32 flags;

	/*
	 * STA powersave frame queues, no more than the internal
	 * locking required.
	 */
	struct sk_buff_head ps_tx_buf;
	struct sk_buff_head tx_filtered;

	/* Updated from RX path only, no locking requirements */
	unsigned long rx_packets, rx_bytes;
	unsigned long wep_weak_iv_count;
	unsigned long last_rx;
	long last_connected;
	unsigned long num_duplicates;
	unsigned long rx_fragments;
	unsigned long rx_dropped;
	int last_signal;
	struct ewma avg_signal;
	__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];

	/* Updated from TX status path only, no locking requirements */
	unsigned long tx_filtered_count;
	unsigned long tx_retry_failed, tx_retry_count;
	/* moving percentage of failed MSDUs */
	unsigned int fail_avg;

	/* Updated from TX path only, no locking requirements */
	unsigned long tx_packets;
	unsigned long tx_bytes;
	unsigned long tx_fragments;
	struct ieee80211_tx_rate last_tx_rate;
	int last_rx_rate_idx;
	int last_rx_rate_flag;
	u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];

	/*
	 * Aggregation information, locked with lock.
	 */
	struct sta_ampdu_mlme ampdu_mlme;
	u8 timer_to_tid[STA_TID_NUM];

#ifdef CONFIG_MAC80211_MESH
	/*
	 * Mesh peer link attributes
	 * TODO: move to a sub-structure that is referenced with pointer?
	 */
	__le16 llid;
	__le16 plid;
	__le16 reason;
	u8 plink_retries;
	bool ignore_plink_timer;
	bool plink_timer_was_running;
	enum nl80211_plink_state plink_state;
	u32 plink_timeout;
	struct timer_list plink_timer;
#endif

#ifdef CONFIG_MAC80211_DEBUGFS
	struct sta_info_debugfsdentries {
		struct dentry *dir;
		bool add_has_run;
	} debugfs;
#endif

	unsigned int lost_packets;

	/* keep last! */
	struct ieee80211_sta sta;
};

static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
{
#ifdef CONFIG_MAC80211_MESH
	return sta->plink_state;
#endif
	return NL80211_PLINK_LISTEN;
}

static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
{
	unsigned long irqfl;

	spin_lock_irqsave(&sta->flaglock, irqfl);
	sta->flags |= flags;
	spin_unlock_irqrestore(&sta->flaglock, irqfl);
}

static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
{
	unsigned long irqfl;

	spin_lock_irqsave(&sta->flaglock, irqfl);
	sta->flags &= ~flags;
	spin_unlock_irqrestore(&sta->flaglock, irqfl);
}

static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
{
	u32 ret;
	unsigned long irqfl;

	spin_lock_irqsave(&sta->flaglock, irqfl);
	ret = sta->flags & flags;
	spin_unlock_irqrestore(&sta->flaglock, irqfl);

	return ret;
}

static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
					   const u32 flags)
{
	u32 ret;
	unsigned long irqfl;

	spin_lock_irqsave(&sta->flaglock, irqfl);
	ret = sta->flags & flags;
	sta->flags &= ~flags;
	spin_unlock_irqrestore(&sta->flaglock, irqfl);

	return ret;
}

static inline u32 get_sta_flags(struct sta_info *sta)
{
	u32 ret;
	unsigned long irqfl;

	spin_lock_irqsave(&sta->flaglock, irqfl);
	ret = sta->flags;
	spin_unlock_irqrestore(&sta->flaglock, irqfl);

	return ret;
}

void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
			     struct tid_ampdu_tx *tid_tx);

static inline struct tid_ampdu_tx *
rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
{
	return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
					 lockdep_is_held(&sta->lock) ||
					 lockdep_is_held(&sta->ampdu_mlme.mtx));
}

#define STA_HASH_SIZE 256
#define STA_HASH(sta) (sta[5])


/* Maximum number of frames to buffer per power saving station */
#define STA_MAX_TX_BUFFER 128

/* Minimum buffered frame expiry time. If STA uses listen interval that is
 * smaller than this value, the minimum value here is used instead. */
#define STA_TX_BUFFER_EXPIRE (10 * HZ)

/* How often station data is cleaned up (e.g., expiration of buffered frames)
 */
#define STA_INFO_CLEANUP_INTERVAL (10 * HZ)

/*
 * Get a STA info, must be under RCU read lock.
 */
struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
			      const u8 *addr);

struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
				  const u8 *addr);

static inline
void for_each_sta_info_type_check(struct ieee80211_local *local,
				  const u8 *addr,
				  struct sta_info *sta,
				  struct sta_info *nxt)
{
}

#define for_each_sta_info(local, _addr, _sta, nxt) 			\
	for (	/* initialise loop */					\
		_sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
		nxt = _sta ? rcu_dereference(_sta->hnext) : NULL;	\
		/* typecheck */						\
		for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
		/* continue condition */				\
		_sta;							\
		/* advance loop */					\
		_sta = nxt,						\
		nxt = _sta ? rcu_dereference(_sta->hnext) : NULL	\
	     )								\
	/* compare address and run code only if it matches */		\
	if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)

/*
 * Get STA info by index, BROKEN!
 */
struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
				     int idx);
/*
 * Create a new STA info, caller owns returned structure
 * until sta_info_insert().
 */
struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
				u8 *addr, gfp_t gfp);
/*
 * Insert STA info into hash table/list, returns zero or a
 * -EEXIST if (if the same MAC address is already present).
 *
 * Calling the non-rcu version makes the caller relinquish,
 * the _rcu version calls read_lock_rcu() and must be called
 * without it held.
 */
int sta_info_insert(struct sta_info *sta);
int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
int sta_info_insert_atomic(struct sta_info *sta);

int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
			  const u8 *addr);
int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
			      const u8 *addr);

void sta_info_set_tim_bit(struct sta_info *sta);
void sta_info_clear_tim_bit(struct sta_info *sta);

void sta_info_init(struct ieee80211_local *local);
void sta_info_stop(struct ieee80211_local *local);
int sta_info_flush(struct ieee80211_local *local,
		   struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
			  unsigned long exp_time);

void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);

#endif /* STA_INFO_H */