xref: /openbmc/linux/net/mac80211/sta_info.h (revision 9ac8d3fb)
1 /*
2  * Copyright 2002-2005, Devicescape Software, Inc.
3  *
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.
7  */
8 
9 #ifndef STA_INFO_H
10 #define STA_INFO_H
11 
12 #include <linux/list.h>
13 #include <linux/types.h>
14 #include <linux/if_ether.h>
15 #include "key.h"
16 
17 /**
18  * enum ieee80211_sta_info_flags - Stations flags
19  *
20  * These flags are used with &struct sta_info's @flags member.
21  *
22  * @WLAN_STA_AUTH: Station is authenticated.
23  * @WLAN_STA_ASSOC: Station is associated.
24  * @WLAN_STA_PS: Station is in power-save mode
25  * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
26  *	This bit is always checked so needs to be enabled for all stations
27  *	when virtual port control is not in use.
28  * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
29  *	frames.
30  * @WLAN_STA_ASSOC_AP: We're associated to that station, it is an AP.
31  * @WLAN_STA_WME: Station is a QoS-STA.
32  * @WLAN_STA_WDS: Station is one of our WDS peers.
33  * @WLAN_STA_PSPOLL: Station has just PS-polled us.
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  */
38 enum ieee80211_sta_info_flags {
39 	WLAN_STA_AUTH		= 1<<0,
40 	WLAN_STA_ASSOC		= 1<<1,
41 	WLAN_STA_PS		= 1<<2,
42 	WLAN_STA_AUTHORIZED	= 1<<3,
43 	WLAN_STA_SHORT_PREAMBLE	= 1<<4,
44 	WLAN_STA_ASSOC_AP	= 1<<5,
45 	WLAN_STA_WME		= 1<<6,
46 	WLAN_STA_WDS		= 1<<7,
47 	WLAN_STA_PSPOLL		= 1<<8,
48 	WLAN_STA_CLEAR_PS_FILT	= 1<<9,
49 };
50 
51 #define STA_TID_NUM 16
52 #define ADDBA_RESP_INTERVAL HZ
53 #define HT_AGG_MAX_RETRIES		(0x3)
54 
55 #define HT_AGG_STATE_INITIATOR_SHIFT	(4)
56 
57 #define HT_ADDBA_REQUESTED_MSK		BIT(0)
58 #define HT_ADDBA_DRV_READY_MSK		BIT(1)
59 #define HT_ADDBA_RECEIVED_MSK		BIT(2)
60 #define HT_AGG_STATE_REQ_STOP_BA_MSK	BIT(3)
61 #define HT_AGG_STATE_INITIATOR_MSK      BIT(HT_AGG_STATE_INITIATOR_SHIFT)
62 #define HT_AGG_STATE_IDLE		(0x0)
63 #define HT_AGG_STATE_OPERATIONAL	(HT_ADDBA_REQUESTED_MSK |	\
64 					 HT_ADDBA_DRV_READY_MSK |	\
65 					 HT_ADDBA_RECEIVED_MSK)
66 #define HT_AGG_STATE_DEBUGFS_CTL	BIT(7)
67 
68 /**
69  * struct tid_ampdu_tx - TID aggregation information (Tx).
70  *
71  * @addba_resp_timer: timer for peer's response to addba request
72  * @ssn: Starting Sequence Number expected to be aggregated.
73  * @dialog_token: dialog token for aggregation session
74  */
75 struct tid_ampdu_tx {
76 	struct timer_list addba_resp_timer;
77 	u16 ssn;
78 	u8 dialog_token;
79 };
80 
81 /**
82  * struct tid_ampdu_rx - TID aggregation information (Rx).
83  *
84  * @reorder_buf: buffer to reorder incoming aggregated MPDUs
85  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
86  * @head_seq_num: head sequence number in reordering buffer.
87  * @stored_mpdu_num: number of MPDUs in reordering buffer
88  * @ssn: Starting Sequence Number expected to be aggregated.
89  * @buf_size: buffer size for incoming A-MPDUs
90  * @timeout: reset timer value.
91  * @dialog_token: dialog token for aggregation session
92  */
93 struct tid_ampdu_rx {
94 	struct sk_buff **reorder_buf;
95 	struct timer_list session_timer;
96 	u16 head_seq_num;
97 	u16 stored_mpdu_num;
98 	u16 ssn;
99 	u16 buf_size;
100 	u16 timeout;
101 	u8 dialog_token;
102 };
103 
104 /**
105  * enum plink_state - state of a mesh peer link finite state machine
106  *
107  * @PLINK_LISTEN: initial state, considered the implicit state of non existant
108  * 	mesh peer links
109  * @PLINK_OPN_SNT: mesh plink open frame has been sent to this mesh peer
110  * @PLINK_OPN_RCVD: mesh plink open frame has been received from this mesh peer
111  * @PLINK_CNF_RCVD: mesh plink confirm frame has been received from this mesh
112  * 	peer
113  * @PLINK_ESTAB: mesh peer link is established
114  * @PLINK_HOLDING: mesh peer link is being closed or cancelled
115  * @PLINK_BLOCKED: all frames transmitted from this mesh plink are discarded
116  */
117 enum plink_state {
118 	PLINK_LISTEN,
119 	PLINK_OPN_SNT,
120 	PLINK_OPN_RCVD,
121 	PLINK_CNF_RCVD,
122 	PLINK_ESTAB,
123 	PLINK_HOLDING,
124 	PLINK_BLOCKED
125 };
126 
127 /**
128  * struct sta_ampdu_mlme - STA aggregation information.
129  *
130  * @tid_state_rx: TID's state in Rx session state machine.
131  * @tid_rx: aggregation info for Rx per TID
132  * @tid_state_tx: TID's state in Tx session state machine.
133  * @tid_tx: aggregation info for Tx per TID
134  * @addba_req_num: number of times addBA request has been sent.
135  * @dialog_token_allocator: dialog token enumerator for each new session;
136  */
137 struct sta_ampdu_mlme {
138 	/* rx */
139 	u8 tid_state_rx[STA_TID_NUM];
140 	struct tid_ampdu_rx *tid_rx[STA_TID_NUM];
141 	/* tx */
142 	u8 tid_state_tx[STA_TID_NUM];
143 	struct tid_ampdu_tx *tid_tx[STA_TID_NUM];
144 	u8 addba_req_num[STA_TID_NUM];
145 	u8 dialog_token_allocator;
146 };
147 
148 
149 /* see __sta_info_unlink */
150 #define STA_INFO_PIN_STAT_NORMAL	0
151 #define STA_INFO_PIN_STAT_PINNED	1
152 #define STA_INFO_PIN_STAT_DESTROY	2
153 
154 /**
155  * struct sta_info - STA information
156  *
157  * This structure collects information about a station that
158  * mac80211 is communicating with.
159  *
160  * @list: global linked list entry
161  * @hnext: hash table linked list pointer
162  * @local: pointer to the global information
163  * @sdata: TBD
164  * @key: TBD
165  * @rate_ctrl: TBD
166  * @rate_ctrl_priv: TBD
167  * @lock: used for locking all fields that require locking, see comments
168  *	in the header file.
169  * @flaglock: spinlock for flags accesses
170  * @addr: MAC address of this STA
171  * @aid: STA's unique AID (1..2007, 0 = not assigned yet),
172  *	only used in AP (and IBSS?) mode
173  * @listen_interval: TBD
174  * @pin_status: TBD
175  * @flags: STA flags, see &enum ieee80211_sta_info_flags
176  * @ps_tx_buf: buffer of frames to transmit to this station
177  *	when it leaves power saving state
178  * @tx_filtered: buffer of frames we already tried to transmit
179  *	but were filtered by hardware due to STA having entered
180  *	power saving state
181  * @rx_packets: Number of MSDUs received from this STA
182  * @rx_bytes: Number of bytes received from this STA
183  * @wep_weak_iv_count: TBD
184  * @last_rx: TBD
185  * @num_duplicates: number of duplicate frames received from this STA
186  * @rx_fragments: number of received MPDUs
187  * @rx_dropped: number of dropped MPDUs from this STA
188  * @last_signal: signal of last received frame from this STA
189  * @last_qual: qual of last received frame from this STA
190  * @last_noise: noise of last received frame from this STA
191  * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
192  * @tx_filtered_count: TBD
193  * @tx_retry_failed: TBD
194  * @tx_retry_count: TBD
195  * @fail_avg: moving percentage of failed MSDUs
196  * @tx_packets: number of RX/TX MSDUs
197  * @tx_bytes: TBD
198  * @tx_fragments: number of transmitted MPDUs
199  * @last_txrate_idx: Index of the last used transmit rate
200  * @tid_seq: TBD
201  * @ampdu_mlme: TBD
202  * @timer_to_tid: identity mapping to ID timers
203  * @tid_to_tx_q: map tid to tx queue
204  * @llid: Local link ID
205  * @plid: Peer link ID
206  * @reason: Cancel reason on PLINK_HOLDING state
207  * @plink_retries: Retries in establishment
208  * @ignore_plink_timer: TBD
209  * @plink_state plink_state: TBD
210  * @plink_timeout: TBD
211  * @plink_timer: TBD
212  * @debugfs: debug filesystem info
213  * @sta: station information we share with the driver
214  */
215 struct sta_info {
216 	/* General information, mostly static */
217 	struct list_head list;
218 	struct sta_info *hnext;
219 	struct ieee80211_local *local;
220 	struct ieee80211_sub_if_data *sdata;
221 	struct ieee80211_key *key;
222 	struct rate_control_ref *rate_ctrl;
223 	void *rate_ctrl_priv;
224 	spinlock_t lock;
225 	spinlock_t flaglock;
226 
227 	u16 listen_interval;
228 
229 	/*
230 	 * for use by the internal lifetime management,
231 	 * see __sta_info_unlink
232 	 */
233 	u8 pin_status;
234 
235 	/*
236 	 * frequently updated, locked with own spinlock (flaglock),
237 	 * use the accessors defined below
238 	 */
239 	u32 flags;
240 
241 	/*
242 	 * STA powersave frame queues, no more than the internal
243 	 * locking required.
244 	 */
245 	struct sk_buff_head ps_tx_buf;
246 	struct sk_buff_head tx_filtered;
247 
248 	/* Updated from RX path only, no locking requirements */
249 	unsigned long rx_packets, rx_bytes;
250 	unsigned long wep_weak_iv_count;
251 	unsigned long last_rx;
252 	unsigned long num_duplicates;
253 	unsigned long rx_fragments;
254 	unsigned long rx_dropped;
255 	int last_signal;
256 	int last_qual;
257 	int last_noise;
258 	__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
259 
260 	/* Updated from TX status path only, no locking requirements */
261 	unsigned long tx_filtered_count;
262 	unsigned long tx_retry_failed, tx_retry_count;
263 	/* moving percentage of failed MSDUs */
264 	unsigned int fail_avg;
265 
266 	/* Updated from TX path only, no locking requirements */
267 	unsigned long tx_packets;
268 	unsigned long tx_bytes;
269 	unsigned long tx_fragments;
270 	unsigned int last_txrate_idx;
271 	u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
272 
273 	/*
274 	 * Aggregation information, locked with lock.
275 	 */
276 	struct sta_ampdu_mlme ampdu_mlme;
277 	u8 timer_to_tid[STA_TID_NUM];
278 	u8 tid_to_tx_q[STA_TID_NUM];
279 
280 #ifdef CONFIG_MAC80211_MESH
281 	/*
282 	 * Mesh peer link attributes
283 	 * TODO: move to a sub-structure that is referenced with pointer?
284 	 */
285 	__le16 llid;
286 	__le16 plid;
287 	__le16 reason;
288 	u8 plink_retries;
289 	bool ignore_plink_timer;
290 	enum plink_state plink_state;
291 	u32 plink_timeout;
292 	struct timer_list plink_timer;
293 #endif
294 
295 #ifdef CONFIG_MAC80211_DEBUGFS
296 	struct sta_info_debugfsdentries {
297 		struct dentry *dir;
298 		struct dentry *flags;
299 		struct dentry *num_ps_buf_frames;
300 		struct dentry *inactive_ms;
301 		struct dentry *last_seq_ctrl;
302 		struct dentry *agg_status;
303 		bool add_has_run;
304 	} debugfs;
305 #endif
306 
307 	/* keep last! */
308 	struct ieee80211_sta sta;
309 };
310 
311 static inline enum plink_state sta_plink_state(struct sta_info *sta)
312 {
313 #ifdef CONFIG_MAC80211_MESH
314 	return sta->plink_state;
315 #endif
316 	return PLINK_LISTEN;
317 }
318 
319 static inline void set_sta_flags(struct sta_info *sta, const u32 flags)
320 {
321 	unsigned long irqfl;
322 
323 	spin_lock_irqsave(&sta->flaglock, irqfl);
324 	sta->flags |= flags;
325 	spin_unlock_irqrestore(&sta->flaglock, irqfl);
326 }
327 
328 static inline void clear_sta_flags(struct sta_info *sta, const u32 flags)
329 {
330 	unsigned long irqfl;
331 
332 	spin_lock_irqsave(&sta->flaglock, irqfl);
333 	sta->flags &= ~flags;
334 	spin_unlock_irqrestore(&sta->flaglock, irqfl);
335 }
336 
337 static inline void set_and_clear_sta_flags(struct sta_info *sta,
338 					   const u32 set, const u32 clear)
339 {
340 	unsigned long irqfl;
341 
342 	spin_lock_irqsave(&sta->flaglock, irqfl);
343 	sta->flags |= set;
344 	sta->flags &= ~clear;
345 	spin_unlock_irqrestore(&sta->flaglock, irqfl);
346 }
347 
348 static inline u32 test_sta_flags(struct sta_info *sta, const u32 flags)
349 {
350 	u32 ret;
351 	unsigned long irqfl;
352 
353 	spin_lock_irqsave(&sta->flaglock, irqfl);
354 	ret = sta->flags & flags;
355 	spin_unlock_irqrestore(&sta->flaglock, irqfl);
356 
357 	return ret;
358 }
359 
360 static inline u32 test_and_clear_sta_flags(struct sta_info *sta,
361 					   const u32 flags)
362 {
363 	u32 ret;
364 	unsigned long irqfl;
365 
366 	spin_lock_irqsave(&sta->flaglock, irqfl);
367 	ret = sta->flags & flags;
368 	sta->flags &= ~flags;
369 	spin_unlock_irqrestore(&sta->flaglock, irqfl);
370 
371 	return ret;
372 }
373 
374 static inline u32 get_sta_flags(struct sta_info *sta)
375 {
376 	u32 ret;
377 	unsigned long irqfl;
378 
379 	spin_lock_irqsave(&sta->flaglock, irqfl);
380 	ret = sta->flags;
381 	spin_unlock_irqrestore(&sta->flaglock, irqfl);
382 
383 	return ret;
384 }
385 
386 
387 /* Maximum number of concurrently registered stations */
388 #define MAX_STA_COUNT 2007
389 
390 #define STA_HASH_SIZE 256
391 #define STA_HASH(sta) (sta[5])
392 
393 
394 /* Maximum number of frames to buffer per power saving station */
395 #define STA_MAX_TX_BUFFER 128
396 
397 /* Minimum buffered frame expiry time. If STA uses listen interval that is
398  * smaller than this value, the minimum value here is used instead. */
399 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
400 
401 /* How often station data is cleaned up (e.g., expiration of buffered frames)
402  */
403 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
404 
405 /*
406  * Get a STA info, must have be under RCU read lock.
407  */
408 struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr);
409 /*
410  * Get STA info by index, BROKEN!
411  */
412 struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
413 				      struct net_device *dev);
414 /*
415  * Create a new STA info, caller owns returned structure
416  * until sta_info_insert().
417  */
418 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
419 				u8 *addr, gfp_t gfp);
420 /*
421  * Insert STA info into hash table/list, returns zero or a
422  * -EEXIST if (if the same MAC address is already present).
423  *
424  * Calling this without RCU protection makes the caller
425  * relinquish its reference to @sta.
426  */
427 int sta_info_insert(struct sta_info *sta);
428 /*
429  * Unlink a STA info from the hash table/list.
430  * This can NULL the STA pointer if somebody else
431  * has already unlinked it.
432  */
433 void sta_info_unlink(struct sta_info **sta);
434 
435 void sta_info_destroy(struct sta_info *sta);
436 void sta_info_set_tim_bit(struct sta_info *sta);
437 void sta_info_clear_tim_bit(struct sta_info *sta);
438 
439 void sta_info_init(struct ieee80211_local *local);
440 int sta_info_start(struct ieee80211_local *local);
441 void sta_info_stop(struct ieee80211_local *local);
442 int sta_info_flush(struct ieee80211_local *local,
443 		    struct ieee80211_sub_if_data *sdata);
444 void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata);
445 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
446 			  unsigned long exp_time);
447 
448 #endif /* STA_INFO_H */
449