xref: /openbmc/linux/include/net/mac80211.h (revision 4da722ca)
1 /*
2  * mac80211 <-> driver interface
3  *
4  * Copyright 2002-2005, Devicescape Software, Inc.
5  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
6  * Copyright 2007-2010	Johannes Berg <johannes@sipsolutions.net>
7  * Copyright 2013-2014  Intel Mobile Communications GmbH
8  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  */
14 
15 #ifndef MAC80211_H
16 #define MAC80211_H
17 
18 #include <linux/bug.h>
19 #include <linux/kernel.h>
20 #include <linux/if_ether.h>
21 #include <linux/skbuff.h>
22 #include <linux/ieee80211.h>
23 #include <net/cfg80211.h>
24 #include <net/codel.h>
25 #include <asm/unaligned.h>
26 
27 /**
28  * DOC: Introduction
29  *
30  * mac80211 is the Linux stack for 802.11 hardware that implements
31  * only partial functionality in hard- or firmware. This document
32  * defines the interface between mac80211 and low-level hardware
33  * drivers.
34  */
35 
36 /**
37  * DOC: Calling mac80211 from interrupts
38  *
39  * Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be
40  * called in hardware interrupt context. The low-level driver must not call any
41  * other functions in hardware interrupt context. If there is a need for such
42  * call, the low-level driver should first ACK the interrupt and perform the
43  * IEEE 802.11 code call after this, e.g. from a scheduled workqueue or even
44  * tasklet function.
45  *
46  * NOTE: If the driver opts to use the _irqsafe() functions, it may not also
47  *	 use the non-IRQ-safe functions!
48  */
49 
50 /**
51  * DOC: Warning
52  *
53  * If you're reading this document and not the header file itself, it will
54  * be incomplete because not all documentation has been converted yet.
55  */
56 
57 /**
58  * DOC: Frame format
59  *
60  * As a general rule, when frames are passed between mac80211 and the driver,
61  * they start with the IEEE 802.11 header and include the same octets that are
62  * sent over the air except for the FCS which should be calculated by the
63  * hardware.
64  *
65  * There are, however, various exceptions to this rule for advanced features:
66  *
67  * The first exception is for hardware encryption and decryption offload
68  * where the IV/ICV may or may not be generated in hardware.
69  *
70  * Secondly, when the hardware handles fragmentation, the frame handed to
71  * the driver from mac80211 is the MSDU, not the MPDU.
72  */
73 
74 /**
75  * DOC: mac80211 workqueue
76  *
77  * mac80211 provides its own workqueue for drivers and internal mac80211 use.
78  * The workqueue is a single threaded workqueue and can only be accessed by
79  * helpers for sanity checking. Drivers must ensure all work added onto the
80  * mac80211 workqueue should be cancelled on the driver stop() callback.
81  *
82  * mac80211 will flushed the workqueue upon interface removal and during
83  * suspend.
84  *
85  * All work performed on the mac80211 workqueue must not acquire the RTNL lock.
86  *
87  */
88 
89 /**
90  * DOC: mac80211 software tx queueing
91  *
92  * mac80211 provides an optional intermediate queueing implementation designed
93  * to allow the driver to keep hardware queues short and provide some fairness
94  * between different stations/interfaces.
95  * In this model, the driver pulls data frames from the mac80211 queue instead
96  * of letting mac80211 push them via drv_tx().
97  * Other frames (e.g. control or management) are still pushed using drv_tx().
98  *
99  * Drivers indicate that they use this model by implementing the .wake_tx_queue
100  * driver operation.
101  *
102  * Intermediate queues (struct ieee80211_txq) are kept per-sta per-tid, with a
103  * single per-vif queue for multicast data frames.
104  *
105  * The driver is expected to initialize its private per-queue data for stations
106  * and interfaces in the .add_interface and .sta_add ops.
107  *
108  * The driver can't access the queue directly. To dequeue a frame, it calls
109  * ieee80211_tx_dequeue(). Whenever mac80211 adds a new frame to a queue, it
110  * calls the .wake_tx_queue driver op.
111  *
112  * For AP powersave TIM handling, the driver only needs to indicate if it has
113  * buffered packets in the driver specific data structures by calling
114  * ieee80211_sta_set_buffered(). For frames buffered in the ieee80211_txq
115  * struct, mac80211 sets the appropriate TIM PVB bits and calls
116  * .release_buffered_frames().
117  * In that callback the driver is therefore expected to release its own
118  * buffered frames and afterwards also frames from the ieee80211_txq (obtained
119  * via the usual ieee80211_tx_dequeue).
120  */
121 
122 struct device;
123 
124 /**
125  * enum ieee80211_max_queues - maximum number of queues
126  *
127  * @IEEE80211_MAX_QUEUES: Maximum number of regular device queues.
128  * @IEEE80211_MAX_QUEUE_MAP: bitmap with maximum queues set
129  */
130 enum ieee80211_max_queues {
131 	IEEE80211_MAX_QUEUES =		16,
132 	IEEE80211_MAX_QUEUE_MAP =	BIT(IEEE80211_MAX_QUEUES) - 1,
133 };
134 
135 #define IEEE80211_INVAL_HW_QUEUE	0xff
136 
137 /**
138  * enum ieee80211_ac_numbers - AC numbers as used in mac80211
139  * @IEEE80211_AC_VO: voice
140  * @IEEE80211_AC_VI: video
141  * @IEEE80211_AC_BE: best effort
142  * @IEEE80211_AC_BK: background
143  */
144 enum ieee80211_ac_numbers {
145 	IEEE80211_AC_VO		= 0,
146 	IEEE80211_AC_VI		= 1,
147 	IEEE80211_AC_BE		= 2,
148 	IEEE80211_AC_BK		= 3,
149 };
150 
151 /**
152  * struct ieee80211_tx_queue_params - transmit queue configuration
153  *
154  * The information provided in this structure is required for QoS
155  * transmit queue configuration. Cf. IEEE 802.11 7.3.2.29.
156  *
157  * @aifs: arbitration interframe space [0..255]
158  * @cw_min: minimum contention window [a value of the form
159  *	2^n-1 in the range 1..32767]
160  * @cw_max: maximum contention window [like @cw_min]
161  * @txop: maximum burst time in units of 32 usecs, 0 meaning disabled
162  * @acm: is mandatory admission control required for the access category
163  * @uapsd: is U-APSD mode enabled for the queue
164  */
165 struct ieee80211_tx_queue_params {
166 	u16 txop;
167 	u16 cw_min;
168 	u16 cw_max;
169 	u8 aifs;
170 	bool acm;
171 	bool uapsd;
172 };
173 
174 struct ieee80211_low_level_stats {
175 	unsigned int dot11ACKFailureCount;
176 	unsigned int dot11RTSFailureCount;
177 	unsigned int dot11FCSErrorCount;
178 	unsigned int dot11RTSSuccessCount;
179 };
180 
181 /**
182  * enum ieee80211_chanctx_change - change flag for channel context
183  * @IEEE80211_CHANCTX_CHANGE_WIDTH: The channel width changed
184  * @IEEE80211_CHANCTX_CHANGE_RX_CHAINS: The number of RX chains changed
185  * @IEEE80211_CHANCTX_CHANGE_RADAR: radar detection flag changed
186  * @IEEE80211_CHANCTX_CHANGE_CHANNEL: switched to another operating channel,
187  *	this is used only with channel switching with CSA
188  * @IEEE80211_CHANCTX_CHANGE_MIN_WIDTH: The min required channel width changed
189  */
190 enum ieee80211_chanctx_change {
191 	IEEE80211_CHANCTX_CHANGE_WIDTH		= BIT(0),
192 	IEEE80211_CHANCTX_CHANGE_RX_CHAINS	= BIT(1),
193 	IEEE80211_CHANCTX_CHANGE_RADAR		= BIT(2),
194 	IEEE80211_CHANCTX_CHANGE_CHANNEL	= BIT(3),
195 	IEEE80211_CHANCTX_CHANGE_MIN_WIDTH	= BIT(4),
196 };
197 
198 /**
199  * struct ieee80211_chanctx_conf - channel context that vifs may be tuned to
200  *
201  * This is the driver-visible part. The ieee80211_chanctx
202  * that contains it is visible in mac80211 only.
203  *
204  * @def: the channel definition
205  * @min_def: the minimum channel definition currently required.
206  * @rx_chains_static: The number of RX chains that must always be
207  *	active on the channel to receive MIMO transmissions
208  * @rx_chains_dynamic: The number of RX chains that must be enabled
209  *	after RTS/CTS handshake to receive SMPS MIMO transmissions;
210  *	this will always be >= @rx_chains_static.
211  * @radar_enabled: whether radar detection is enabled on this channel.
212  * @drv_priv: data area for driver use, will always be aligned to
213  *	sizeof(void *), size is determined in hw information.
214  */
215 struct ieee80211_chanctx_conf {
216 	struct cfg80211_chan_def def;
217 	struct cfg80211_chan_def min_def;
218 
219 	u8 rx_chains_static, rx_chains_dynamic;
220 
221 	bool radar_enabled;
222 
223 	u8 drv_priv[0] __aligned(sizeof(void *));
224 };
225 
226 /**
227  * enum ieee80211_chanctx_switch_mode - channel context switch mode
228  * @CHANCTX_SWMODE_REASSIGN_VIF: Both old and new contexts already
229  *	exist (and will continue to exist), but the virtual interface
230  *	needs to be switched from one to the other.
231  * @CHANCTX_SWMODE_SWAP_CONTEXTS: The old context exists but will stop
232  *      to exist with this call, the new context doesn't exist but
233  *      will be active after this call, the virtual interface switches
234  *      from the old to the new (note that the driver may of course
235  *      implement this as an on-the-fly chandef switch of the existing
236  *      hardware context, but the mac80211 pointer for the old context
237  *      will cease to exist and only the new one will later be used
238  *      for changes/removal.)
239  */
240 enum ieee80211_chanctx_switch_mode {
241 	CHANCTX_SWMODE_REASSIGN_VIF,
242 	CHANCTX_SWMODE_SWAP_CONTEXTS,
243 };
244 
245 /**
246  * struct ieee80211_vif_chanctx_switch - vif chanctx switch information
247  *
248  * This is structure is used to pass information about a vif that
249  * needs to switch from one chanctx to another.  The
250  * &ieee80211_chanctx_switch_mode defines how the switch should be
251  * done.
252  *
253  * @vif: the vif that should be switched from old_ctx to new_ctx
254  * @old_ctx: the old context to which the vif was assigned
255  * @new_ctx: the new context to which the vif must be assigned
256  */
257 struct ieee80211_vif_chanctx_switch {
258 	struct ieee80211_vif *vif;
259 	struct ieee80211_chanctx_conf *old_ctx;
260 	struct ieee80211_chanctx_conf *new_ctx;
261 };
262 
263 /**
264  * enum ieee80211_bss_change - BSS change notification flags
265  *
266  * These flags are used with the bss_info_changed() callback
267  * to indicate which BSS parameter changed.
268  *
269  * @BSS_CHANGED_ASSOC: association status changed (associated/disassociated),
270  *	also implies a change in the AID.
271  * @BSS_CHANGED_ERP_CTS_PROT: CTS protection changed
272  * @BSS_CHANGED_ERP_PREAMBLE: preamble changed
273  * @BSS_CHANGED_ERP_SLOT: slot timing changed
274  * @BSS_CHANGED_HT: 802.11n parameters changed
275  * @BSS_CHANGED_BASIC_RATES: Basic rateset changed
276  * @BSS_CHANGED_BEACON_INT: Beacon interval changed
277  * @BSS_CHANGED_BSSID: BSSID changed, for whatever
278  *	reason (IBSS and managed mode)
279  * @BSS_CHANGED_BEACON: Beacon data changed, retrieve
280  *	new beacon (beaconing modes)
281  * @BSS_CHANGED_BEACON_ENABLED: Beaconing should be
282  *	enabled/disabled (beaconing modes)
283  * @BSS_CHANGED_CQM: Connection quality monitor config changed
284  * @BSS_CHANGED_IBSS: IBSS join status changed
285  * @BSS_CHANGED_ARP_FILTER: Hardware ARP filter address list or state changed.
286  * @BSS_CHANGED_QOS: QoS for this association was enabled/disabled. Note
287  *	that it is only ever disabled for station mode.
288  * @BSS_CHANGED_IDLE: Idle changed for this BSS/interface.
289  * @BSS_CHANGED_SSID: SSID changed for this BSS (AP and IBSS mode)
290  * @BSS_CHANGED_AP_PROBE_RESP: Probe Response changed for this BSS (AP mode)
291  * @BSS_CHANGED_PS: PS changed for this BSS (STA mode)
292  * @BSS_CHANGED_TXPOWER: TX power setting changed for this interface
293  * @BSS_CHANGED_P2P_PS: P2P powersave settings (CTWindow, opportunistic PS)
294  *	changed
295  * @BSS_CHANGED_BEACON_INFO: Data from the AP's beacon became available:
296  *	currently dtim_period only is under consideration.
297  * @BSS_CHANGED_BANDWIDTH: The bandwidth used by this interface changed,
298  *	note that this is only called when it changes after the channel
299  *	context had been assigned.
300  * @BSS_CHANGED_OCB: OCB join status changed
301  * @BSS_CHANGED_MU_GROUPS: VHT MU-MIMO group id or user position changed
302  * @BSS_CHANGED_KEEP_ALIVE: keep alive options (idle period or protected
303  *	keep alive) changed.
304  */
305 enum ieee80211_bss_change {
306 	BSS_CHANGED_ASSOC		= 1<<0,
307 	BSS_CHANGED_ERP_CTS_PROT	= 1<<1,
308 	BSS_CHANGED_ERP_PREAMBLE	= 1<<2,
309 	BSS_CHANGED_ERP_SLOT		= 1<<3,
310 	BSS_CHANGED_HT			= 1<<4,
311 	BSS_CHANGED_BASIC_RATES		= 1<<5,
312 	BSS_CHANGED_BEACON_INT		= 1<<6,
313 	BSS_CHANGED_BSSID		= 1<<7,
314 	BSS_CHANGED_BEACON		= 1<<8,
315 	BSS_CHANGED_BEACON_ENABLED	= 1<<9,
316 	BSS_CHANGED_CQM			= 1<<10,
317 	BSS_CHANGED_IBSS		= 1<<11,
318 	BSS_CHANGED_ARP_FILTER		= 1<<12,
319 	BSS_CHANGED_QOS			= 1<<13,
320 	BSS_CHANGED_IDLE		= 1<<14,
321 	BSS_CHANGED_SSID		= 1<<15,
322 	BSS_CHANGED_AP_PROBE_RESP	= 1<<16,
323 	BSS_CHANGED_PS			= 1<<17,
324 	BSS_CHANGED_TXPOWER		= 1<<18,
325 	BSS_CHANGED_P2P_PS		= 1<<19,
326 	BSS_CHANGED_BEACON_INFO		= 1<<20,
327 	BSS_CHANGED_BANDWIDTH		= 1<<21,
328 	BSS_CHANGED_OCB                 = 1<<22,
329 	BSS_CHANGED_MU_GROUPS		= 1<<23,
330 	BSS_CHANGED_KEEP_ALIVE		= 1<<24,
331 
332 	/* when adding here, make sure to change ieee80211_reconfig */
333 };
334 
335 /*
336  * The maximum number of IPv4 addresses listed for ARP filtering. If the number
337  * of addresses for an interface increase beyond this value, hardware ARP
338  * filtering will be disabled.
339  */
340 #define IEEE80211_BSS_ARP_ADDR_LIST_LEN 4
341 
342 /**
343  * enum ieee80211_event_type - event to be notified to the low level driver
344  * @RSSI_EVENT: AP's rssi crossed the a threshold set by the driver.
345  * @MLME_EVENT: event related to MLME
346  * @BAR_RX_EVENT: a BAR was received
347  * @BA_FRAME_TIMEOUT: Frames were released from the reordering buffer because
348  *	they timed out. This won't be called for each frame released, but only
349  *	once each time the timeout triggers.
350  */
351 enum ieee80211_event_type {
352 	RSSI_EVENT,
353 	MLME_EVENT,
354 	BAR_RX_EVENT,
355 	BA_FRAME_TIMEOUT,
356 };
357 
358 /**
359  * enum ieee80211_rssi_event_data - relevant when event type is %RSSI_EVENT
360  * @RSSI_EVENT_HIGH: AP's rssi went below the threshold set by the driver.
361  * @RSSI_EVENT_LOW: AP's rssi went above the threshold set by the driver.
362  */
363 enum ieee80211_rssi_event_data {
364 	RSSI_EVENT_HIGH,
365 	RSSI_EVENT_LOW,
366 };
367 
368 /**
369  * struct ieee80211_rssi_event - data attached to an %RSSI_EVENT
370  * @data: See &enum ieee80211_rssi_event_data
371  */
372 struct ieee80211_rssi_event {
373 	enum ieee80211_rssi_event_data data;
374 };
375 
376 /**
377  * enum ieee80211_mlme_event_data - relevant when event type is %MLME_EVENT
378  * @AUTH_EVENT: the MLME operation is authentication
379  * @ASSOC_EVENT: the MLME operation is association
380  * @DEAUTH_RX_EVENT: deauth received..
381  * @DEAUTH_TX_EVENT: deauth sent.
382  */
383 enum ieee80211_mlme_event_data {
384 	AUTH_EVENT,
385 	ASSOC_EVENT,
386 	DEAUTH_RX_EVENT,
387 	DEAUTH_TX_EVENT,
388 };
389 
390 /**
391  * enum ieee80211_mlme_event_status - relevant when event type is %MLME_EVENT
392  * @MLME_SUCCESS: the MLME operation completed successfully.
393  * @MLME_DENIED: the MLME operation was denied by the peer.
394  * @MLME_TIMEOUT: the MLME operation timed out.
395  */
396 enum ieee80211_mlme_event_status {
397 	MLME_SUCCESS,
398 	MLME_DENIED,
399 	MLME_TIMEOUT,
400 };
401 
402 /**
403  * struct ieee80211_mlme_event - data attached to an %MLME_EVENT
404  * @data: See &enum ieee80211_mlme_event_data
405  * @status: See &enum ieee80211_mlme_event_status
406  * @reason: the reason code if applicable
407  */
408 struct ieee80211_mlme_event {
409 	enum ieee80211_mlme_event_data data;
410 	enum ieee80211_mlme_event_status status;
411 	u16 reason;
412 };
413 
414 /**
415  * struct ieee80211_ba_event - data attached for BlockAck related events
416  * @sta: pointer to the &ieee80211_sta to which this event relates
417  * @tid: the tid
418  * @ssn: the starting sequence number (for %BAR_RX_EVENT)
419  */
420 struct ieee80211_ba_event {
421 	struct ieee80211_sta *sta;
422 	u16 tid;
423 	u16 ssn;
424 };
425 
426 /**
427  * struct ieee80211_event - event to be sent to the driver
428  * @type: The event itself. See &enum ieee80211_event_type.
429  * @rssi: relevant if &type is %RSSI_EVENT
430  * @mlme: relevant if &type is %AUTH_EVENT
431  * @ba: relevant if &type is %BAR_RX_EVENT or %BA_FRAME_TIMEOUT
432  * @u:union holding the fields above
433  */
434 struct ieee80211_event {
435 	enum ieee80211_event_type type;
436 	union {
437 		struct ieee80211_rssi_event rssi;
438 		struct ieee80211_mlme_event mlme;
439 		struct ieee80211_ba_event ba;
440 	} u;
441 };
442 
443 /**
444  * struct ieee80211_mu_group_data - STA's VHT MU-MIMO group data
445  *
446  * This structure describes the group id data of VHT MU-MIMO
447  *
448  * @membership: 64 bits array - a bit is set if station is member of the group
449  * @position: 2 bits per group id indicating the position in the group
450  */
451 struct ieee80211_mu_group_data {
452 	u8 membership[WLAN_MEMBERSHIP_LEN];
453 	u8 position[WLAN_USER_POSITION_LEN];
454 };
455 
456 /**
457  * struct ieee80211_bss_conf - holds the BSS's changing parameters
458  *
459  * This structure keeps information about a BSS (and an association
460  * to that BSS) that can change during the lifetime of the BSS.
461  *
462  * @assoc: association status
463  * @ibss_joined: indicates whether this station is part of an IBSS
464  *	or not
465  * @ibss_creator: indicates if a new IBSS network is being created
466  * @aid: association ID number, valid only when @assoc is true
467  * @use_cts_prot: use CTS protection
468  * @use_short_preamble: use 802.11b short preamble
469  * @use_short_slot: use short slot time (only relevant for ERP)
470  * @dtim_period: num of beacons before the next DTIM, for beaconing,
471  *	valid in station mode only if after the driver was notified
472  *	with the %BSS_CHANGED_BEACON_INFO flag, will be non-zero then.
473  * @sync_tsf: last beacon's/probe response's TSF timestamp (could be old
474  *	as it may have been received during scanning long ago). If the
475  *	HW flag %IEEE80211_HW_TIMING_BEACON_ONLY is set, then this can
476  *	only come from a beacon, but might not become valid until after
477  *	association when a beacon is received (which is notified with the
478  *	%BSS_CHANGED_DTIM flag.). See also sync_dtim_count important notice.
479  * @sync_device_ts: the device timestamp corresponding to the sync_tsf,
480  *	the driver/device can use this to calculate synchronisation
481  *	(see @sync_tsf). See also sync_dtim_count important notice.
482  * @sync_dtim_count: Only valid when %IEEE80211_HW_TIMING_BEACON_ONLY
483  *	is requested, see @sync_tsf/@sync_device_ts.
484  *	IMPORTANT: These three sync_* parameters would possibly be out of sync
485  *	by the time the driver will use them. The synchronized view is currently
486  *	guaranteed only in certain callbacks.
487  * @beacon_int: beacon interval
488  * @assoc_capability: capabilities taken from assoc resp
489  * @basic_rates: bitmap of basic rates, each bit stands for an
490  *	index into the rate table configured by the driver in
491  *	the current band.
492  * @beacon_rate: associated AP's beacon TX rate
493  * @mcast_rate: per-band multicast rate index + 1 (0: disabled)
494  * @bssid: The BSSID for this BSS
495  * @enable_beacon: whether beaconing should be enabled or not
496  * @chandef: Channel definition for this BSS -- the hardware might be
497  *	configured a higher bandwidth than this BSS uses, for example.
498  * @mu_group: VHT MU-MIMO group membership data
499  * @ht_operation_mode: HT operation mode like in &struct ieee80211_ht_operation.
500  *	This field is only valid when the channel is a wide HT/VHT channel.
501  *	Note that with TDLS this can be the case (channel is HT, protection must
502  *	be used from this field) even when the BSS association isn't using HT.
503  * @cqm_rssi_thold: Connection quality monitor RSSI threshold, a zero value
504  *	implies disabled. As with the cfg80211 callback, a change here should
505  *	cause an event to be sent indicating where the current value is in
506  *	relation to the newly configured threshold.
507  * @cqm_rssi_low: Connection quality monitor RSSI lower threshold, a zero value
508  *	implies disabled.  This is an alternative mechanism to the single
509  *	threshold event and can't be enabled simultaneously with it.
510  * @cqm_rssi_high: Connection quality monitor RSSI upper threshold.
511  * @cqm_rssi_hyst: Connection quality monitor RSSI hysteresis
512  * @arp_addr_list: List of IPv4 addresses for hardware ARP filtering. The
513  *	may filter ARP queries targeted for other addresses than listed here.
514  *	The driver must allow ARP queries targeted for all address listed here
515  *	to pass through. An empty list implies no ARP queries need to pass.
516  * @arp_addr_cnt: Number of addresses currently on the list. Note that this
517  *	may be larger than %IEEE80211_BSS_ARP_ADDR_LIST_LEN (the arp_addr_list
518  *	array size), it's up to the driver what to do in that case.
519  * @qos: This is a QoS-enabled BSS.
520  * @idle: This interface is idle. There's also a global idle flag in the
521  *	hardware config which may be more appropriate depending on what
522  *	your driver/device needs to do.
523  * @ps: power-save mode (STA only). This flag is NOT affected by
524  *	offchannel/dynamic_ps operations.
525  * @ssid: The SSID of the current vif. Valid in AP and IBSS mode.
526  * @ssid_len: Length of SSID given in @ssid.
527  * @hidden_ssid: The SSID of the current vif is hidden. Only valid in AP-mode.
528  * @txpower: TX power in dBm
529  * @txpower_type: TX power adjustment used to control per packet Transmit
530  *	Power Control (TPC) in lower driver for the current vif. In particular
531  *	TPC is enabled if value passed in %txpower_type is
532  *	NL80211_TX_POWER_LIMITED (allow using less than specified from
533  *	userspace), whereas TPC is disabled if %txpower_type is set to
534  *	NL80211_TX_POWER_FIXED (use value configured from userspace)
535  * @p2p_noa_attr: P2P NoA attribute for P2P powersave
536  * @allow_p2p_go_ps: indication for AP or P2P GO interface, whether it's allowed
537  *	to use P2P PS mechanism or not. AP/P2P GO is not allowed to use P2P PS
538  *	if it has associated clients without P2P PS support.
539  * @max_idle_period: the time period during which the station can refrain from
540  *	transmitting frames to its associated AP without being disassociated.
541  *	In units of 1000 TUs. Zero value indicates that the AP did not include
542  *	a (valid) BSS Max Idle Period Element.
543  * @protected_keep_alive: if set, indicates that the station should send an RSN
544  *	protected frame to the AP to reset the idle timer at the AP for the
545  *	station.
546  */
547 struct ieee80211_bss_conf {
548 	const u8 *bssid;
549 	/* association related data */
550 	bool assoc, ibss_joined;
551 	bool ibss_creator;
552 	u16 aid;
553 	/* erp related data */
554 	bool use_cts_prot;
555 	bool use_short_preamble;
556 	bool use_short_slot;
557 	bool enable_beacon;
558 	u8 dtim_period;
559 	u16 beacon_int;
560 	u16 assoc_capability;
561 	u64 sync_tsf;
562 	u32 sync_device_ts;
563 	u8 sync_dtim_count;
564 	u32 basic_rates;
565 	struct ieee80211_rate *beacon_rate;
566 	int mcast_rate[NUM_NL80211_BANDS];
567 	u16 ht_operation_mode;
568 	s32 cqm_rssi_thold;
569 	u32 cqm_rssi_hyst;
570 	s32 cqm_rssi_low;
571 	s32 cqm_rssi_high;
572 	struct cfg80211_chan_def chandef;
573 	struct ieee80211_mu_group_data mu_group;
574 	__be32 arp_addr_list[IEEE80211_BSS_ARP_ADDR_LIST_LEN];
575 	int arp_addr_cnt;
576 	bool qos;
577 	bool idle;
578 	bool ps;
579 	u8 ssid[IEEE80211_MAX_SSID_LEN];
580 	size_t ssid_len;
581 	bool hidden_ssid;
582 	int txpower;
583 	enum nl80211_tx_power_setting txpower_type;
584 	struct ieee80211_p2p_noa_attr p2p_noa_attr;
585 	bool allow_p2p_go_ps;
586 	u16 max_idle_period;
587 	bool protected_keep_alive;
588 };
589 
590 /**
591  * enum mac80211_tx_info_flags - flags to describe transmission information/status
592  *
593  * These flags are used with the @flags member of &ieee80211_tx_info.
594  *
595  * @IEEE80211_TX_CTL_REQ_TX_STATUS: require TX status callback for this frame.
596  * @IEEE80211_TX_CTL_ASSIGN_SEQ: The driver has to assign a sequence
597  *	number to this frame, taking care of not overwriting the fragment
598  *	number and increasing the sequence number only when the
599  *	IEEE80211_TX_CTL_FIRST_FRAGMENT flag is set. mac80211 will properly
600  *	assign sequence numbers to QoS-data frames but cannot do so correctly
601  *	for non-QoS-data and management frames because beacons need them from
602  *	that counter as well and mac80211 cannot guarantee proper sequencing.
603  *	If this flag is set, the driver should instruct the hardware to
604  *	assign a sequence number to the frame or assign one itself. Cf. IEEE
605  *	802.11-2007 7.1.3.4.1 paragraph 3. This flag will always be set for
606  *	beacons and always be clear for frames without a sequence number field.
607  * @IEEE80211_TX_CTL_NO_ACK: tell the low level not to wait for an ack
608  * @IEEE80211_TX_CTL_CLEAR_PS_FILT: clear powersave filter for destination
609  *	station
610  * @IEEE80211_TX_CTL_FIRST_FRAGMENT: this is a first fragment of the frame
611  * @IEEE80211_TX_CTL_SEND_AFTER_DTIM: send this frame after DTIM beacon
612  * @IEEE80211_TX_CTL_AMPDU: this frame should be sent as part of an A-MPDU
613  * @IEEE80211_TX_CTL_INJECTED: Frame was injected, internal to mac80211.
614  * @IEEE80211_TX_STAT_TX_FILTERED: The frame was not transmitted
615  *	because the destination STA was in powersave mode. Note that to
616  *	avoid race conditions, the filter must be set by the hardware or
617  *	firmware upon receiving a frame that indicates that the station
618  *	went to sleep (must be done on device to filter frames already on
619  *	the queue) and may only be unset after mac80211 gives the OK for
620  *	that by setting the IEEE80211_TX_CTL_CLEAR_PS_FILT (see above),
621  *	since only then is it guaranteed that no more frames are in the
622  *	hardware queue.
623  * @IEEE80211_TX_STAT_ACK: Frame was acknowledged
624  * @IEEE80211_TX_STAT_AMPDU: The frame was aggregated, so status
625  * 	is for the whole aggregation.
626  * @IEEE80211_TX_STAT_AMPDU_NO_BACK: no block ack was returned,
627  * 	so consider using block ack request (BAR).
628  * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be
629  *	set by rate control algorithms to indicate probe rate, will
630  *	be cleared for fragmented frames (except on the last fragment)
631  * @IEEE80211_TX_INTFL_OFFCHAN_TX_OK: Internal to mac80211. Used to indicate
632  *	that a frame can be transmitted while the queues are stopped for
633  *	off-channel operation.
634  * @IEEE80211_TX_INTFL_NEED_TXPROCESSING: completely internal to mac80211,
635  *	used to indicate that a pending frame requires TX processing before
636  *	it can be sent out.
637  * @IEEE80211_TX_INTFL_RETRIED: completely internal to mac80211,
638  *	used to indicate that a frame was already retried due to PS
639  * @IEEE80211_TX_INTFL_DONT_ENCRYPT: completely internal to mac80211,
640  *	used to indicate frame should not be encrypted
641  * @IEEE80211_TX_CTL_NO_PS_BUFFER: This frame is a response to a poll
642  *	frame (PS-Poll or uAPSD) or a non-bufferable MMPDU and must
643  *	be sent although the station is in powersave mode.
644  * @IEEE80211_TX_CTL_MORE_FRAMES: More frames will be passed to the
645  *	transmit function after the current frame, this can be used
646  *	by drivers to kick the DMA queue only if unset or when the
647  *	queue gets full.
648  * @IEEE80211_TX_INTFL_RETRANSMISSION: This frame is being retransmitted
649  *	after TX status because the destination was asleep, it must not
650  *	be modified again (no seqno assignment, crypto, etc.)
651  * @IEEE80211_TX_INTFL_MLME_CONN_TX: This frame was transmitted by the MLME
652  *	code for connection establishment, this indicates that its status
653  *	should kick the MLME state machine.
654  * @IEEE80211_TX_INTFL_NL80211_FRAME_TX: Frame was requested through nl80211
655  *	MLME command (internal to mac80211 to figure out whether to send TX
656  *	status to user space)
657  * @IEEE80211_TX_CTL_LDPC: tells the driver to use LDPC for this frame
658  * @IEEE80211_TX_CTL_STBC: Enables Space-Time Block Coding (STBC) for this
659  *	frame and selects the maximum number of streams that it can use.
660  * @IEEE80211_TX_CTL_TX_OFFCHAN: Marks this packet to be transmitted on
661  *	the off-channel channel when a remain-on-channel offload is done
662  *	in hardware -- normal packets still flow and are expected to be
663  *	handled properly by the device.
664  * @IEEE80211_TX_INTFL_TKIP_MIC_FAILURE: Marks this packet to be used for TKIP
665  *	testing. It will be sent out with incorrect Michael MIC key to allow
666  *	TKIP countermeasures to be tested.
667  * @IEEE80211_TX_CTL_NO_CCK_RATE: This frame will be sent at non CCK rate.
668  *	This flag is actually used for management frame especially for P2P
669  *	frames not being sent at CCK rate in 2GHz band.
670  * @IEEE80211_TX_STATUS_EOSP: This packet marks the end of service period,
671  *	when its status is reported the service period ends. For frames in
672  *	an SP that mac80211 transmits, it is already set; for driver frames
673  *	the driver may set this flag. It is also used to do the same for
674  *	PS-Poll responses.
675  * @IEEE80211_TX_CTL_USE_MINRATE: This frame will be sent at lowest rate.
676  *	This flag is used to send nullfunc frame at minimum rate when
677  *	the nullfunc is used for connection monitoring purpose.
678  * @IEEE80211_TX_CTL_DONTFRAG: Don't fragment this packet even if it
679  *	would be fragmented by size (this is optional, only used for
680  *	monitor injection).
681  * @IEEE80211_TX_STAT_NOACK_TRANSMITTED: A frame that was marked with
682  *	IEEE80211_TX_CTL_NO_ACK has been successfully transmitted without
683  *	any errors (like issues specific to the driver/HW).
684  *	This flag must not be set for frames that don't request no-ack
685  *	behaviour with IEEE80211_TX_CTL_NO_ACK.
686  *
687  * Note: If you have to add new flags to the enumeration, then don't
688  *	 forget to update %IEEE80211_TX_TEMPORARY_FLAGS when necessary.
689  */
690 enum mac80211_tx_info_flags {
691 	IEEE80211_TX_CTL_REQ_TX_STATUS		= BIT(0),
692 	IEEE80211_TX_CTL_ASSIGN_SEQ		= BIT(1),
693 	IEEE80211_TX_CTL_NO_ACK			= BIT(2),
694 	IEEE80211_TX_CTL_CLEAR_PS_FILT		= BIT(3),
695 	IEEE80211_TX_CTL_FIRST_FRAGMENT		= BIT(4),
696 	IEEE80211_TX_CTL_SEND_AFTER_DTIM	= BIT(5),
697 	IEEE80211_TX_CTL_AMPDU			= BIT(6),
698 	IEEE80211_TX_CTL_INJECTED		= BIT(7),
699 	IEEE80211_TX_STAT_TX_FILTERED		= BIT(8),
700 	IEEE80211_TX_STAT_ACK			= BIT(9),
701 	IEEE80211_TX_STAT_AMPDU			= BIT(10),
702 	IEEE80211_TX_STAT_AMPDU_NO_BACK		= BIT(11),
703 	IEEE80211_TX_CTL_RATE_CTRL_PROBE	= BIT(12),
704 	IEEE80211_TX_INTFL_OFFCHAN_TX_OK	= BIT(13),
705 	IEEE80211_TX_INTFL_NEED_TXPROCESSING	= BIT(14),
706 	IEEE80211_TX_INTFL_RETRIED		= BIT(15),
707 	IEEE80211_TX_INTFL_DONT_ENCRYPT		= BIT(16),
708 	IEEE80211_TX_CTL_NO_PS_BUFFER		= BIT(17),
709 	IEEE80211_TX_CTL_MORE_FRAMES		= BIT(18),
710 	IEEE80211_TX_INTFL_RETRANSMISSION	= BIT(19),
711 	IEEE80211_TX_INTFL_MLME_CONN_TX		= BIT(20),
712 	IEEE80211_TX_INTFL_NL80211_FRAME_TX	= BIT(21),
713 	IEEE80211_TX_CTL_LDPC			= BIT(22),
714 	IEEE80211_TX_CTL_STBC			= BIT(23) | BIT(24),
715 	IEEE80211_TX_CTL_TX_OFFCHAN		= BIT(25),
716 	IEEE80211_TX_INTFL_TKIP_MIC_FAILURE	= BIT(26),
717 	IEEE80211_TX_CTL_NO_CCK_RATE		= BIT(27),
718 	IEEE80211_TX_STATUS_EOSP		= BIT(28),
719 	IEEE80211_TX_CTL_USE_MINRATE		= BIT(29),
720 	IEEE80211_TX_CTL_DONTFRAG		= BIT(30),
721 	IEEE80211_TX_STAT_NOACK_TRANSMITTED	= BIT(31),
722 };
723 
724 #define IEEE80211_TX_CTL_STBC_SHIFT		23
725 
726 /**
727  * enum mac80211_tx_control_flags - flags to describe transmit control
728  *
729  * @IEEE80211_TX_CTRL_PORT_CTRL_PROTO: this frame is a port control
730  *	protocol frame (e.g. EAP)
731  * @IEEE80211_TX_CTRL_PS_RESPONSE: This frame is a response to a poll
732  *	frame (PS-Poll or uAPSD).
733  * @IEEE80211_TX_CTRL_RATE_INJECT: This frame is injected with rate information
734  * @IEEE80211_TX_CTRL_AMSDU: This frame is an A-MSDU frame
735  * @IEEE80211_TX_CTRL_FAST_XMIT: This frame is going through the fast_xmit path
736  *
737  * These flags are used in tx_info->control.flags.
738  */
739 enum mac80211_tx_control_flags {
740 	IEEE80211_TX_CTRL_PORT_CTRL_PROTO	= BIT(0),
741 	IEEE80211_TX_CTRL_PS_RESPONSE		= BIT(1),
742 	IEEE80211_TX_CTRL_RATE_INJECT		= BIT(2),
743 	IEEE80211_TX_CTRL_AMSDU			= BIT(3),
744 	IEEE80211_TX_CTRL_FAST_XMIT		= BIT(4),
745 };
746 
747 /*
748  * This definition is used as a mask to clear all temporary flags, which are
749  * set by the tx handlers for each transmission attempt by the mac80211 stack.
750  */
751 #define IEEE80211_TX_TEMPORARY_FLAGS (IEEE80211_TX_CTL_NO_ACK |		      \
752 	IEEE80211_TX_CTL_CLEAR_PS_FILT | IEEE80211_TX_CTL_FIRST_FRAGMENT |    \
753 	IEEE80211_TX_CTL_SEND_AFTER_DTIM | IEEE80211_TX_CTL_AMPDU |	      \
754 	IEEE80211_TX_STAT_TX_FILTERED |	IEEE80211_TX_STAT_ACK |		      \
755 	IEEE80211_TX_STAT_AMPDU | IEEE80211_TX_STAT_AMPDU_NO_BACK |	      \
756 	IEEE80211_TX_CTL_RATE_CTRL_PROBE | IEEE80211_TX_CTL_NO_PS_BUFFER |    \
757 	IEEE80211_TX_CTL_MORE_FRAMES | IEEE80211_TX_CTL_LDPC |		      \
758 	IEEE80211_TX_CTL_STBC | IEEE80211_TX_STATUS_EOSP)
759 
760 /**
761  * enum mac80211_rate_control_flags - per-rate flags set by the
762  *	Rate Control algorithm.
763  *
764  * These flags are set by the Rate control algorithm for each rate during tx,
765  * in the @flags member of struct ieee80211_tx_rate.
766  *
767  * @IEEE80211_TX_RC_USE_RTS_CTS: Use RTS/CTS exchange for this rate.
768  * @IEEE80211_TX_RC_USE_CTS_PROTECT: CTS-to-self protection is required.
769  *	This is set if the current BSS requires ERP protection.
770  * @IEEE80211_TX_RC_USE_SHORT_PREAMBLE: Use short preamble.
771  * @IEEE80211_TX_RC_MCS: HT rate.
772  * @IEEE80211_TX_RC_VHT_MCS: VHT MCS rate, in this case the idx field is split
773  *	into a higher 4 bits (Nss) and lower 4 bits (MCS number)
774  * @IEEE80211_TX_RC_GREEN_FIELD: Indicates whether this rate should be used in
775  *	Greenfield mode.
776  * @IEEE80211_TX_RC_40_MHZ_WIDTH: Indicates if the Channel Width should be 40 MHz.
777  * @IEEE80211_TX_RC_80_MHZ_WIDTH: Indicates 80 MHz transmission
778  * @IEEE80211_TX_RC_160_MHZ_WIDTH: Indicates 160 MHz transmission
779  *	(80+80 isn't supported yet)
780  * @IEEE80211_TX_RC_DUP_DATA: The frame should be transmitted on both of the
781  *	adjacent 20 MHz channels, if the current channel type is
782  *	NL80211_CHAN_HT40MINUS or NL80211_CHAN_HT40PLUS.
783  * @IEEE80211_TX_RC_SHORT_GI: Short Guard interval should be used for this rate.
784  */
785 enum mac80211_rate_control_flags {
786 	IEEE80211_TX_RC_USE_RTS_CTS		= BIT(0),
787 	IEEE80211_TX_RC_USE_CTS_PROTECT		= BIT(1),
788 	IEEE80211_TX_RC_USE_SHORT_PREAMBLE	= BIT(2),
789 
790 	/* rate index is an HT/VHT MCS instead of an index */
791 	IEEE80211_TX_RC_MCS			= BIT(3),
792 	IEEE80211_TX_RC_GREEN_FIELD		= BIT(4),
793 	IEEE80211_TX_RC_40_MHZ_WIDTH		= BIT(5),
794 	IEEE80211_TX_RC_DUP_DATA		= BIT(6),
795 	IEEE80211_TX_RC_SHORT_GI		= BIT(7),
796 	IEEE80211_TX_RC_VHT_MCS			= BIT(8),
797 	IEEE80211_TX_RC_80_MHZ_WIDTH		= BIT(9),
798 	IEEE80211_TX_RC_160_MHZ_WIDTH		= BIT(10),
799 };
800 
801 
802 /* there are 40 bytes if you don't need the rateset to be kept */
803 #define IEEE80211_TX_INFO_DRIVER_DATA_SIZE 40
804 
805 /* if you do need the rateset, then you have less space */
806 #define IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE 24
807 
808 /* maximum number of rate stages */
809 #define IEEE80211_TX_MAX_RATES	4
810 
811 /* maximum number of rate table entries */
812 #define IEEE80211_TX_RATE_TABLE_SIZE	4
813 
814 /**
815  * struct ieee80211_tx_rate - rate selection/status
816  *
817  * @idx: rate index to attempt to send with
818  * @flags: rate control flags (&enum mac80211_rate_control_flags)
819  * @count: number of tries in this rate before going to the next rate
820  *
821  * A value of -1 for @idx indicates an invalid rate and, if used
822  * in an array of retry rates, that no more rates should be tried.
823  *
824  * When used for transmit status reporting, the driver should
825  * always report the rate along with the flags it used.
826  *
827  * &struct ieee80211_tx_info contains an array of these structs
828  * in the control information, and it will be filled by the rate
829  * control algorithm according to what should be sent. For example,
830  * if this array contains, in the format { <idx>, <count> } the
831  * information::
832  *
833  *    { 3, 2 }, { 2, 2 }, { 1, 4 }, { -1, 0 }, { -1, 0 }
834  *
835  * then this means that the frame should be transmitted
836  * up to twice at rate 3, up to twice at rate 2, and up to four
837  * times at rate 1 if it doesn't get acknowledged. Say it gets
838  * acknowledged by the peer after the fifth attempt, the status
839  * information should then contain::
840  *
841  *   { 3, 2 }, { 2, 2 }, { 1, 1 }, { -1, 0 } ...
842  *
843  * since it was transmitted twice at rate 3, twice at rate 2
844  * and once at rate 1 after which we received an acknowledgement.
845  */
846 struct ieee80211_tx_rate {
847 	s8 idx;
848 	u16 count:5,
849 	    flags:11;
850 } __packed;
851 
852 #define IEEE80211_MAX_TX_RETRY		31
853 
854 static inline void ieee80211_rate_set_vht(struct ieee80211_tx_rate *rate,
855 					  u8 mcs, u8 nss)
856 {
857 	WARN_ON(mcs & ~0xF);
858 	WARN_ON((nss - 1) & ~0x7);
859 	rate->idx = ((nss - 1) << 4) | mcs;
860 }
861 
862 static inline u8
863 ieee80211_rate_get_vht_mcs(const struct ieee80211_tx_rate *rate)
864 {
865 	return rate->idx & 0xF;
866 }
867 
868 static inline u8
869 ieee80211_rate_get_vht_nss(const struct ieee80211_tx_rate *rate)
870 {
871 	return (rate->idx >> 4) + 1;
872 }
873 
874 /**
875  * struct ieee80211_tx_info - skb transmit information
876  *
877  * This structure is placed in skb->cb for three uses:
878  *  (1) mac80211 TX control - mac80211 tells the driver what to do
879  *  (2) driver internal use (if applicable)
880  *  (3) TX status information - driver tells mac80211 what happened
881  *
882  * @flags: transmit info flags, defined above
883  * @band: the band to transmit on (use for checking for races)
884  * @hw_queue: HW queue to put the frame on, skb_get_queue_mapping() gives the AC
885  * @ack_frame_id: internal frame ID for TX status, used internally
886  * @control: union for control data
887  * @status: union for status data
888  * @driver_data: array of driver_data pointers
889  * @ampdu_ack_len: number of acked aggregated frames.
890  * 	relevant only if IEEE80211_TX_STAT_AMPDU was set.
891  * @ampdu_len: number of aggregated frames.
892  * 	relevant only if IEEE80211_TX_STAT_AMPDU was set.
893  * @ack_signal: signal strength of the ACK frame
894  */
895 struct ieee80211_tx_info {
896 	/* common information */
897 	u32 flags;
898 	u8 band;
899 
900 	u8 hw_queue;
901 
902 	u16 ack_frame_id;
903 
904 	union {
905 		struct {
906 			union {
907 				/* rate control */
908 				struct {
909 					struct ieee80211_tx_rate rates[
910 						IEEE80211_TX_MAX_RATES];
911 					s8 rts_cts_rate_idx;
912 					u8 use_rts:1;
913 					u8 use_cts_prot:1;
914 					u8 short_preamble:1;
915 					u8 skip_table:1;
916 					/* 2 bytes free */
917 				};
918 				/* only needed before rate control */
919 				unsigned long jiffies;
920 			};
921 			/* NB: vif can be NULL for injected frames */
922 			union {
923 				/* NB: vif can be NULL for injected frames */
924 				struct ieee80211_vif *vif;
925 
926 				/* When packets are enqueued on txq it's easy
927 				 * to re-construct the vif pointer. There's no
928 				 * more space in tx_info so it can be used to
929 				 * store the necessary enqueue time for packet
930 				 * sojourn time computation.
931 				 */
932 				codel_time_t enqueue_time;
933 			};
934 			struct ieee80211_key_conf *hw_key;
935 			u32 flags;
936 			/* 4 bytes free */
937 		} control;
938 		struct {
939 			u64 cookie;
940 		} ack;
941 		struct {
942 			struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];
943 			s32 ack_signal;
944 			u8 ampdu_ack_len;
945 			u8 ampdu_len;
946 			u8 antenna;
947 			u16 tx_time;
948 			void *status_driver_data[19 / sizeof(void *)];
949 		} status;
950 		struct {
951 			struct ieee80211_tx_rate driver_rates[
952 				IEEE80211_TX_MAX_RATES];
953 			u8 pad[4];
954 
955 			void *rate_driver_data[
956 				IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE / sizeof(void *)];
957 		};
958 		void *driver_data[
959 			IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *)];
960 	};
961 };
962 
963 /**
964  * struct ieee80211_tx_status - extended tx staus info for rate control
965  *
966  * @sta: Station that the packet was transmitted for
967  * @info: Basic tx status information
968  * @skb: Packet skb (can be NULL if not provided by the driver)
969  */
970 struct ieee80211_tx_status {
971 	struct ieee80211_sta *sta;
972 	struct ieee80211_tx_info *info;
973 	struct sk_buff *skb;
974 };
975 
976 /**
977  * struct ieee80211_scan_ies - descriptors for different blocks of IEs
978  *
979  * This structure is used to point to different blocks of IEs in HW scan
980  * and scheduled scan. These blocks contain the IEs passed by userspace
981  * and the ones generated by mac80211.
982  *
983  * @ies: pointers to band specific IEs.
984  * @len: lengths of band_specific IEs.
985  * @common_ies: IEs for all bands (especially vendor specific ones)
986  * @common_ie_len: length of the common_ies
987  */
988 struct ieee80211_scan_ies {
989 	const u8 *ies[NUM_NL80211_BANDS];
990 	size_t len[NUM_NL80211_BANDS];
991 	const u8 *common_ies;
992 	size_t common_ie_len;
993 };
994 
995 
996 static inline struct ieee80211_tx_info *IEEE80211_SKB_CB(struct sk_buff *skb)
997 {
998 	return (struct ieee80211_tx_info *)skb->cb;
999 }
1000 
1001 static inline struct ieee80211_rx_status *IEEE80211_SKB_RXCB(struct sk_buff *skb)
1002 {
1003 	return (struct ieee80211_rx_status *)skb->cb;
1004 }
1005 
1006 /**
1007  * ieee80211_tx_info_clear_status - clear TX status
1008  *
1009  * @info: The &struct ieee80211_tx_info to be cleared.
1010  *
1011  * When the driver passes an skb back to mac80211, it must report
1012  * a number of things in TX status. This function clears everything
1013  * in the TX status but the rate control information (it does clear
1014  * the count since you need to fill that in anyway).
1015  *
1016  * NOTE: You can only use this function if you do NOT use
1017  *	 info->driver_data! Use info->rate_driver_data
1018  *	 instead if you need only the less space that allows.
1019  */
1020 static inline void
1021 ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
1022 {
1023 	int i;
1024 
1025 	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
1026 		     offsetof(struct ieee80211_tx_info, control.rates));
1027 	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
1028 		     offsetof(struct ieee80211_tx_info, driver_rates));
1029 	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 8);
1030 	/* clear the rate counts */
1031 	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++)
1032 		info->status.rates[i].count = 0;
1033 
1034 	BUILD_BUG_ON(
1035 	    offsetof(struct ieee80211_tx_info, status.ack_signal) != 20);
1036 	memset(&info->status.ampdu_ack_len, 0,
1037 	       sizeof(struct ieee80211_tx_info) -
1038 	       offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
1039 }
1040 
1041 
1042 /**
1043  * enum mac80211_rx_flags - receive flags
1044  *
1045  * These flags are used with the @flag member of &struct ieee80211_rx_status.
1046  * @RX_FLAG_MMIC_ERROR: Michael MIC error was reported on this frame.
1047  *	Use together with %RX_FLAG_MMIC_STRIPPED.
1048  * @RX_FLAG_DECRYPTED: This frame was decrypted in hardware.
1049  * @RX_FLAG_MMIC_STRIPPED: the Michael MIC is stripped off this frame,
1050  *	verification has been done by the hardware.
1051  * @RX_FLAG_IV_STRIPPED: The IV and ICV are stripped from this frame.
1052  *	If this flag is set, the stack cannot do any replay detection
1053  *	hence the driver or hardware will have to do that.
1054  * @RX_FLAG_PN_VALIDATED: Currently only valid for CCMP/GCMP frames, this
1055  *	flag indicates that the PN was verified for replay protection.
1056  *	Note that this flag is also currently only supported when a frame
1057  *	is also decrypted (ie. @RX_FLAG_DECRYPTED must be set)
1058  * @RX_FLAG_DUP_VALIDATED: The driver should set this flag if it did
1059  *	de-duplication by itself.
1060  * @RX_FLAG_FAILED_FCS_CRC: Set this flag if the FCS check failed on
1061  *	the frame.
1062  * @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on
1063  *	the frame.
1064  * @RX_FLAG_MACTIME_START: The timestamp passed in the RX status (@mactime
1065  *	field) is valid and contains the time the first symbol of the MPDU
1066  *	was received. This is useful in monitor mode and for proper IBSS
1067  *	merging.
1068  * @RX_FLAG_MACTIME_END: The timestamp passed in the RX status (@mactime
1069  *	field) is valid and contains the time the last symbol of the MPDU
1070  *	(including FCS) was received.
1071  * @RX_FLAG_MACTIME_PLCP_START: The timestamp passed in the RX status (@mactime
1072  *	field) is valid and contains the time the SYNC preamble was received.
1073  * @RX_FLAG_NO_SIGNAL_VAL: The signal strength value is not present.
1074  *	Valid only for data frames (mainly A-MPDU)
1075  * @RX_FLAG_AMPDU_DETAILS: A-MPDU details are known, in particular the reference
1076  *	number (@ampdu_reference) must be populated and be a distinct number for
1077  *	each A-MPDU
1078  * @RX_FLAG_AMPDU_LAST_KNOWN: last subframe is known, should be set on all
1079  *	subframes of a single A-MPDU
1080  * @RX_FLAG_AMPDU_IS_LAST: this subframe is the last subframe of the A-MPDU
1081  * @RX_FLAG_AMPDU_DELIM_CRC_ERROR: A delimiter CRC error has been detected
1082  *	on this subframe
1083  * @RX_FLAG_AMPDU_DELIM_CRC_KNOWN: The delimiter CRC field is known (the CRC
1084  *	is stored in the @ampdu_delimiter_crc field)
1085  * @RX_FLAG_MIC_STRIPPED: The mic was stripped of this packet. Decryption was
1086  *	done by the hardware
1087  * @RX_FLAG_ONLY_MONITOR: Report frame only to monitor interfaces without
1088  *	processing it in any regular way.
1089  *	This is useful if drivers offload some frames but still want to report
1090  *	them for sniffing purposes.
1091  * @RX_FLAG_SKIP_MONITOR: Process and report frame to all interfaces except
1092  *	monitor interfaces.
1093  *	This is useful if drivers offload some frames but still want to report
1094  *	them for sniffing purposes.
1095  * @RX_FLAG_AMSDU_MORE: Some drivers may prefer to report separate A-MSDU
1096  *	subframes instead of a one huge frame for performance reasons.
1097  *	All, but the last MSDU from an A-MSDU should have this flag set. E.g.
1098  *	if an A-MSDU has 3 frames, the first 2 must have the flag set, while
1099  *	the 3rd (last) one must not have this flag set. The flag is used to
1100  *	deal with retransmission/duplication recovery properly since A-MSDU
1101  *	subframes share the same sequence number. Reported subframes can be
1102  *	either regular MSDU or singly A-MSDUs. Subframes must not be
1103  *	interleaved with other frames.
1104  * @RX_FLAG_RADIOTAP_VENDOR_DATA: This frame contains vendor-specific
1105  *	radiotap data in the skb->data (before the frame) as described by
1106  *	the &struct ieee80211_vendor_radiotap.
1107  * @RX_FLAG_ALLOW_SAME_PN: Allow the same PN as same packet before.
1108  *	This is used for AMSDU subframes which can have the same PN as
1109  *	the first subframe.
1110  * @RX_FLAG_ICV_STRIPPED: The ICV is stripped from this frame. CRC checking must
1111  *	be done in the hardware.
1112  */
1113 enum mac80211_rx_flags {
1114 	RX_FLAG_MMIC_ERROR		= BIT(0),
1115 	RX_FLAG_DECRYPTED		= BIT(1),
1116 	RX_FLAG_MACTIME_PLCP_START	= BIT(2),
1117 	RX_FLAG_MMIC_STRIPPED		= BIT(3),
1118 	RX_FLAG_IV_STRIPPED		= BIT(4),
1119 	RX_FLAG_FAILED_FCS_CRC		= BIT(5),
1120 	RX_FLAG_FAILED_PLCP_CRC 	= BIT(6),
1121 	RX_FLAG_MACTIME_START		= BIT(7),
1122 	RX_FLAG_NO_SIGNAL_VAL		= BIT(8),
1123 	RX_FLAG_AMPDU_DETAILS		= BIT(9),
1124 	RX_FLAG_PN_VALIDATED		= BIT(10),
1125 	RX_FLAG_DUP_VALIDATED		= BIT(11),
1126 	RX_FLAG_AMPDU_LAST_KNOWN	= BIT(12),
1127 	RX_FLAG_AMPDU_IS_LAST		= BIT(13),
1128 	RX_FLAG_AMPDU_DELIM_CRC_ERROR	= BIT(14),
1129 	RX_FLAG_AMPDU_DELIM_CRC_KNOWN	= BIT(15),
1130 	RX_FLAG_MACTIME_END		= BIT(16),
1131 	RX_FLAG_ONLY_MONITOR		= BIT(17),
1132 	RX_FLAG_SKIP_MONITOR		= BIT(18),
1133 	RX_FLAG_AMSDU_MORE		= BIT(19),
1134 	RX_FLAG_RADIOTAP_VENDOR_DATA	= BIT(20),
1135 	RX_FLAG_MIC_STRIPPED		= BIT(21),
1136 	RX_FLAG_ALLOW_SAME_PN		= BIT(22),
1137 	RX_FLAG_ICV_STRIPPED		= BIT(23),
1138 };
1139 
1140 /**
1141  * enum mac80211_rx_encoding_flags - MCS & bandwidth flags
1142  *
1143  * @RX_ENC_FLAG_SHORTPRE: Short preamble was used for this frame
1144  * @RX_ENC_FLAG_SHORT_GI: Short guard interval was used
1145  * @RX_ENC_FLAG_HT_GF: This frame was received in a HT-greenfield transmission,
1146  *	if the driver fills this value it should add
1147  *	%IEEE80211_RADIOTAP_MCS_HAVE_FMT
1148  *	to hw.radiotap_mcs_details to advertise that fact
1149  * @RX_ENC_FLAG_LDPC: LDPC was used
1150  * @RX_ENC_FLAG_STBC_MASK: STBC 2 bit bitmask. 1 - Nss=1, 2 - Nss=2, 3 - Nss=3
1151  * @RX_ENC_FLAG_BF: packet was beamformed
1152  */
1153 enum mac80211_rx_encoding_flags {
1154 	RX_ENC_FLAG_SHORTPRE		= BIT(0),
1155 	RX_ENC_FLAG_SHORT_GI		= BIT(2),
1156 	RX_ENC_FLAG_HT_GF		= BIT(3),
1157 	RX_ENC_FLAG_STBC_MASK		= BIT(4) | BIT(5),
1158 	RX_ENC_FLAG_LDPC		= BIT(6),
1159 	RX_ENC_FLAG_BF			= BIT(7),
1160 };
1161 
1162 #define RX_ENC_FLAG_STBC_SHIFT		4
1163 
1164 enum mac80211_rx_encoding {
1165 	RX_ENC_LEGACY = 0,
1166 	RX_ENC_HT,
1167 	RX_ENC_VHT,
1168 };
1169 
1170 /**
1171  * struct ieee80211_rx_status - receive status
1172  *
1173  * The low-level driver should provide this information (the subset
1174  * supported by hardware) to the 802.11 code with each received
1175  * frame, in the skb's control buffer (cb).
1176  *
1177  * @mactime: value in microseconds of the 64-bit Time Synchronization Function
1178  * 	(TSF) timer when the first data symbol (MPDU) arrived at the hardware.
1179  * @boottime_ns: CLOCK_BOOTTIME timestamp the frame was received at, this is
1180  *	needed only for beacons and probe responses that update the scan cache.
1181  * @device_timestamp: arbitrary timestamp for the device, mac80211 doesn't use
1182  *	it but can store it and pass it back to the driver for synchronisation
1183  * @band: the active band when this frame was received
1184  * @freq: frequency the radio was tuned to when receiving this frame, in MHz
1185  *	This field must be set for management frames, but isn't strictly needed
1186  *	for data (other) frames - for those it only affects radiotap reporting.
1187  * @signal: signal strength when receiving this frame, either in dBm, in dB or
1188  *	unspecified depending on the hardware capabilities flags
1189  *	@IEEE80211_HW_SIGNAL_*
1190  * @chains: bitmask of receive chains for which separate signal strength
1191  *	values were filled.
1192  * @chain_signal: per-chain signal strength, in dBm (unlike @signal, doesn't
1193  *	support dB or unspecified units)
1194  * @antenna: antenna used
1195  * @rate_idx: index of data rate into band's supported rates or MCS index if
1196  *	HT or VHT is used (%RX_FLAG_HT/%RX_FLAG_VHT)
1197  * @nss: number of streams (VHT and HE only)
1198  * @flag: %RX_FLAG_\*
1199  * @encoding: &enum mac80211_rx_encoding
1200  * @bw: &enum rate_info_bw
1201  * @enc_flags: uses bits from &enum mac80211_rx_encoding_flags
1202  * @rx_flags: internal RX flags for mac80211
1203  * @ampdu_reference: A-MPDU reference number, must be a different value for
1204  *	each A-MPDU but the same for each subframe within one A-MPDU
1205  * @ampdu_delimiter_crc: A-MPDU delimiter CRC
1206  */
1207 struct ieee80211_rx_status {
1208 	u64 mactime;
1209 	u64 boottime_ns;
1210 	u32 device_timestamp;
1211 	u32 ampdu_reference;
1212 	u32 flag;
1213 	u16 freq;
1214 	u8 enc_flags;
1215 	u8 encoding:2, bw:3;
1216 	u8 rate_idx;
1217 	u8 nss;
1218 	u8 rx_flags;
1219 	u8 band;
1220 	u8 antenna;
1221 	s8 signal;
1222 	u8 chains;
1223 	s8 chain_signal[IEEE80211_MAX_CHAINS];
1224 	u8 ampdu_delimiter_crc;
1225 };
1226 
1227 /**
1228  * struct ieee80211_vendor_radiotap - vendor radiotap data information
1229  * @present: presence bitmap for this vendor namespace
1230  *	(this could be extended in the future if any vendor needs more
1231  *	 bits, the radiotap spec does allow for that)
1232  * @align: radiotap vendor namespace alignment. This defines the needed
1233  *	alignment for the @data field below, not for the vendor namespace
1234  *	description itself (which has a fixed 2-byte alignment)
1235  *	Must be a power of two, and be set to at least 1!
1236  * @oui: radiotap vendor namespace OUI
1237  * @subns: radiotap vendor sub namespace
1238  * @len: radiotap vendor sub namespace skip length, if alignment is done
1239  *	then that's added to this, i.e. this is only the length of the
1240  *	@data field.
1241  * @pad: number of bytes of padding after the @data, this exists so that
1242  *	the skb data alignment can be preserved even if the data has odd
1243  *	length
1244  * @data: the actual vendor namespace data
1245  *
1246  * This struct, including the vendor data, goes into the skb->data before
1247  * the 802.11 header. It's split up in mac80211 using the align/oui/subns
1248  * data.
1249  */
1250 struct ieee80211_vendor_radiotap {
1251 	u32 present;
1252 	u8 align;
1253 	u8 oui[3];
1254 	u8 subns;
1255 	u8 pad;
1256 	u16 len;
1257 	u8 data[];
1258 } __packed;
1259 
1260 /**
1261  * enum ieee80211_conf_flags - configuration flags
1262  *
1263  * Flags to define PHY configuration options
1264  *
1265  * @IEEE80211_CONF_MONITOR: there's a monitor interface present -- use this
1266  *	to determine for example whether to calculate timestamps for packets
1267  *	or not, do not use instead of filter flags!
1268  * @IEEE80211_CONF_PS: Enable 802.11 power save mode (managed mode only).
1269  *	This is the power save mode defined by IEEE 802.11-2007 section 11.2,
1270  *	meaning that the hardware still wakes up for beacons, is able to
1271  *	transmit frames and receive the possible acknowledgment frames.
1272  *	Not to be confused with hardware specific wakeup/sleep states,
1273  *	driver is responsible for that. See the section "Powersave support"
1274  *	for more.
1275  * @IEEE80211_CONF_IDLE: The device is running, but idle; if the flag is set
1276  *	the driver should be prepared to handle configuration requests but
1277  *	may turn the device off as much as possible. Typically, this flag will
1278  *	be set when an interface is set UP but not associated or scanning, but
1279  *	it can also be unset in that case when monitor interfaces are active.
1280  * @IEEE80211_CONF_OFFCHANNEL: The device is currently not on its main
1281  *	operating channel.
1282  */
1283 enum ieee80211_conf_flags {
1284 	IEEE80211_CONF_MONITOR		= (1<<0),
1285 	IEEE80211_CONF_PS		= (1<<1),
1286 	IEEE80211_CONF_IDLE		= (1<<2),
1287 	IEEE80211_CONF_OFFCHANNEL	= (1<<3),
1288 };
1289 
1290 
1291 /**
1292  * enum ieee80211_conf_changed - denotes which configuration changed
1293  *
1294  * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed
1295  * @IEEE80211_CONF_CHANGE_MONITOR: the monitor flag changed
1296  * @IEEE80211_CONF_CHANGE_PS: the PS flag or dynamic PS timeout changed
1297  * @IEEE80211_CONF_CHANGE_POWER: the TX power changed
1298  * @IEEE80211_CONF_CHANGE_CHANNEL: the channel/channel_type changed
1299  * @IEEE80211_CONF_CHANGE_RETRY_LIMITS: retry limits changed
1300  * @IEEE80211_CONF_CHANGE_IDLE: Idle flag changed
1301  * @IEEE80211_CONF_CHANGE_SMPS: Spatial multiplexing powersave mode changed
1302  *	Note that this is only valid if channel contexts are not used,
1303  *	otherwise each channel context has the number of chains listed.
1304  */
1305 enum ieee80211_conf_changed {
1306 	IEEE80211_CONF_CHANGE_SMPS		= BIT(1),
1307 	IEEE80211_CONF_CHANGE_LISTEN_INTERVAL	= BIT(2),
1308 	IEEE80211_CONF_CHANGE_MONITOR		= BIT(3),
1309 	IEEE80211_CONF_CHANGE_PS		= BIT(4),
1310 	IEEE80211_CONF_CHANGE_POWER		= BIT(5),
1311 	IEEE80211_CONF_CHANGE_CHANNEL		= BIT(6),
1312 	IEEE80211_CONF_CHANGE_RETRY_LIMITS	= BIT(7),
1313 	IEEE80211_CONF_CHANGE_IDLE		= BIT(8),
1314 };
1315 
1316 /**
1317  * enum ieee80211_smps_mode - spatial multiplexing power save mode
1318  *
1319  * @IEEE80211_SMPS_AUTOMATIC: automatic
1320  * @IEEE80211_SMPS_OFF: off
1321  * @IEEE80211_SMPS_STATIC: static
1322  * @IEEE80211_SMPS_DYNAMIC: dynamic
1323  * @IEEE80211_SMPS_NUM_MODES: internal, don't use
1324  */
1325 enum ieee80211_smps_mode {
1326 	IEEE80211_SMPS_AUTOMATIC,
1327 	IEEE80211_SMPS_OFF,
1328 	IEEE80211_SMPS_STATIC,
1329 	IEEE80211_SMPS_DYNAMIC,
1330 
1331 	/* keep last */
1332 	IEEE80211_SMPS_NUM_MODES,
1333 };
1334 
1335 /**
1336  * struct ieee80211_conf - configuration of the device
1337  *
1338  * This struct indicates how the driver shall configure the hardware.
1339  *
1340  * @flags: configuration flags defined above
1341  *
1342  * @listen_interval: listen interval in units of beacon interval
1343  * @ps_dtim_period: The DTIM period of the AP we're connected to, for use
1344  *	in power saving. Power saving will not be enabled until a beacon
1345  *	has been received and the DTIM period is known.
1346  * @dynamic_ps_timeout: The dynamic powersave timeout (in ms), see the
1347  *	powersave documentation below. This variable is valid only when
1348  *	the CONF_PS flag is set.
1349  *
1350  * @power_level: requested transmit power (in dBm), backward compatibility
1351  *	value only that is set to the minimum of all interfaces
1352  *
1353  * @chandef: the channel definition to tune to
1354  * @radar_enabled: whether radar detection is enabled
1355  *
1356  * @long_frame_max_tx_count: Maximum number of transmissions for a "long" frame
1357  *	(a frame not RTS protected), called "dot11LongRetryLimit" in 802.11,
1358  *	but actually means the number of transmissions not the number of retries
1359  * @short_frame_max_tx_count: Maximum number of transmissions for a "short"
1360  *	frame, called "dot11ShortRetryLimit" in 802.11, but actually means the
1361  *	number of transmissions not the number of retries
1362  *
1363  * @smps_mode: spatial multiplexing powersave mode; note that
1364  *	%IEEE80211_SMPS_STATIC is used when the device is not
1365  *	configured for an HT channel.
1366  *	Note that this is only valid if channel contexts are not used,
1367  *	otherwise each channel context has the number of chains listed.
1368  */
1369 struct ieee80211_conf {
1370 	u32 flags;
1371 	int power_level, dynamic_ps_timeout;
1372 
1373 	u16 listen_interval;
1374 	u8 ps_dtim_period;
1375 
1376 	u8 long_frame_max_tx_count, short_frame_max_tx_count;
1377 
1378 	struct cfg80211_chan_def chandef;
1379 	bool radar_enabled;
1380 	enum ieee80211_smps_mode smps_mode;
1381 };
1382 
1383 /**
1384  * struct ieee80211_channel_switch - holds the channel switch data
1385  *
1386  * The information provided in this structure is required for channel switch
1387  * operation.
1388  *
1389  * @timestamp: value in microseconds of the 64-bit Time Synchronization
1390  *	Function (TSF) timer when the frame containing the channel switch
1391  *	announcement was received. This is simply the rx.mactime parameter
1392  *	the driver passed into mac80211.
1393  * @device_timestamp: arbitrary timestamp for the device, this is the
1394  *	rx.device_timestamp parameter the driver passed to mac80211.
1395  * @block_tx: Indicates whether transmission must be blocked before the
1396  *	scheduled channel switch, as indicated by the AP.
1397  * @chandef: the new channel to switch to
1398  * @count: the number of TBTT's until the channel switch event
1399  */
1400 struct ieee80211_channel_switch {
1401 	u64 timestamp;
1402 	u32 device_timestamp;
1403 	bool block_tx;
1404 	struct cfg80211_chan_def chandef;
1405 	u8 count;
1406 };
1407 
1408 /**
1409  * enum ieee80211_vif_flags - virtual interface flags
1410  *
1411  * @IEEE80211_VIF_BEACON_FILTER: the device performs beacon filtering
1412  *	on this virtual interface to avoid unnecessary CPU wakeups
1413  * @IEEE80211_VIF_SUPPORTS_CQM_RSSI: the device can do connection quality
1414  *	monitoring on this virtual interface -- i.e. it can monitor
1415  *	connection quality related parameters, such as the RSSI level and
1416  *	provide notifications if configured trigger levels are reached.
1417  * @IEEE80211_VIF_SUPPORTS_UAPSD: The device can do U-APSD for this
1418  *	interface. This flag should be set during interface addition,
1419  *	but may be set/cleared as late as authentication to an AP. It is
1420  *	only valid for managed/station mode interfaces.
1421  * @IEEE80211_VIF_GET_NOA_UPDATE: request to handle NOA attributes
1422  *	and send P2P_PS notification to the driver if NOA changed, even
1423  *	this is not pure P2P vif.
1424  */
1425 enum ieee80211_vif_flags {
1426 	IEEE80211_VIF_BEACON_FILTER		= BIT(0),
1427 	IEEE80211_VIF_SUPPORTS_CQM_RSSI		= BIT(1),
1428 	IEEE80211_VIF_SUPPORTS_UAPSD		= BIT(2),
1429 	IEEE80211_VIF_GET_NOA_UPDATE		= BIT(3),
1430 };
1431 
1432 /**
1433  * struct ieee80211_vif - per-interface data
1434  *
1435  * Data in this structure is continually present for driver
1436  * use during the life of a virtual interface.
1437  *
1438  * @type: type of this virtual interface
1439  * @bss_conf: BSS configuration for this interface, either our own
1440  *	or the BSS we're associated to
1441  * @addr: address of this interface
1442  * @p2p: indicates whether this AP or STA interface is a p2p
1443  *	interface, i.e. a GO or p2p-sta respectively
1444  * @csa_active: marks whether a channel switch is going on. Internally it is
1445  *	write-protected by sdata_lock and local->mtx so holding either is fine
1446  *	for read access.
1447  * @mu_mimo_owner: indicates interface owns MU-MIMO capability
1448  * @driver_flags: flags/capabilities the driver has for this interface,
1449  *	these need to be set (or cleared) when the interface is added
1450  *	or, if supported by the driver, the interface type is changed
1451  *	at runtime, mac80211 will never touch this field
1452  * @hw_queue: hardware queue for each AC
1453  * @cab_queue: content-after-beacon (DTIM beacon really) queue, AP mode only
1454  * @chanctx_conf: The channel context this interface is assigned to, or %NULL
1455  *	when it is not assigned. This pointer is RCU-protected due to the TX
1456  *	path needing to access it; even though the netdev carrier will always
1457  *	be off when it is %NULL there can still be races and packets could be
1458  *	processed after it switches back to %NULL.
1459  * @debugfs_dir: debugfs dentry, can be used by drivers to create own per
1460  *	interface debug files. Note that it will be NULL for the virtual
1461  *	monitor interface (if that is requested.)
1462  * @probe_req_reg: probe requests should be reported to mac80211 for this
1463  *	interface.
1464  * @drv_priv: data area for driver use, will always be aligned to
1465  *	sizeof(void \*).
1466  * @txq: the multicast data TX queue (if driver uses the TXQ abstraction)
1467  */
1468 struct ieee80211_vif {
1469 	enum nl80211_iftype type;
1470 	struct ieee80211_bss_conf bss_conf;
1471 	u8 addr[ETH_ALEN] __aligned(2);
1472 	bool p2p;
1473 	bool csa_active;
1474 	bool mu_mimo_owner;
1475 
1476 	u8 cab_queue;
1477 	u8 hw_queue[IEEE80211_NUM_ACS];
1478 
1479 	struct ieee80211_txq *txq;
1480 
1481 	struct ieee80211_chanctx_conf __rcu *chanctx_conf;
1482 
1483 	u32 driver_flags;
1484 
1485 #ifdef CONFIG_MAC80211_DEBUGFS
1486 	struct dentry *debugfs_dir;
1487 #endif
1488 
1489 	unsigned int probe_req_reg;
1490 
1491 	/* must be last */
1492 	u8 drv_priv[0] __aligned(sizeof(void *));
1493 };
1494 
1495 static inline bool ieee80211_vif_is_mesh(struct ieee80211_vif *vif)
1496 {
1497 #ifdef CONFIG_MAC80211_MESH
1498 	return vif->type == NL80211_IFTYPE_MESH_POINT;
1499 #endif
1500 	return false;
1501 }
1502 
1503 /**
1504  * wdev_to_ieee80211_vif - return a vif struct from a wdev
1505  * @wdev: the wdev to get the vif for
1506  *
1507  * This can be used by mac80211 drivers with direct cfg80211 APIs
1508  * (like the vendor commands) that get a wdev.
1509  *
1510  * Note that this function may return %NULL if the given wdev isn't
1511  * associated with a vif that the driver knows about (e.g. monitor
1512  * or AP_VLAN interfaces.)
1513  */
1514 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev);
1515 
1516 /**
1517  * ieee80211_vif_to_wdev - return a wdev struct from a vif
1518  * @vif: the vif to get the wdev for
1519  *
1520  * This can be used by mac80211 drivers with direct cfg80211 APIs
1521  * (like the vendor commands) that needs to get the wdev for a vif.
1522  *
1523  * Note that this function may return %NULL if the given wdev isn't
1524  * associated with a vif that the driver knows about (e.g. monitor
1525  * or AP_VLAN interfaces.)
1526  */
1527 struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif);
1528 
1529 /**
1530  * enum ieee80211_key_flags - key flags
1531  *
1532  * These flags are used for communication about keys between the driver
1533  * and mac80211, with the @flags parameter of &struct ieee80211_key_conf.
1534  *
1535  * @IEEE80211_KEY_FLAG_GENERATE_IV: This flag should be set by the
1536  *	driver to indicate that it requires IV generation for this
1537  *	particular key. Setting this flag does not necessarily mean that SKBs
1538  *	will have sufficient tailroom for ICV or MIC.
1539  * @IEEE80211_KEY_FLAG_GENERATE_MMIC: This flag should be set by
1540  *	the driver for a TKIP key if it requires Michael MIC
1541  *	generation in software.
1542  * @IEEE80211_KEY_FLAG_PAIRWISE: Set by mac80211, this flag indicates
1543  *	that the key is pairwise rather then a shared key.
1544  * @IEEE80211_KEY_FLAG_SW_MGMT_TX: This flag should be set by the driver for a
1545  *	CCMP/GCMP key if it requires CCMP/GCMP encryption of management frames
1546  *	(MFP) to be done in software.
1547  * @IEEE80211_KEY_FLAG_PUT_IV_SPACE: This flag should be set by the driver
1548  *	if space should be prepared for the IV, but the IV
1549  *	itself should not be generated. Do not set together with
1550  *	@IEEE80211_KEY_FLAG_GENERATE_IV on the same key. Setting this flag does
1551  *	not necessarily mean that SKBs will have sufficient tailroom for ICV or
1552  *	MIC.
1553  * @IEEE80211_KEY_FLAG_RX_MGMT: This key will be used to decrypt received
1554  *	management frames. The flag can help drivers that have a hardware
1555  *	crypto implementation that doesn't deal with management frames
1556  *	properly by allowing them to not upload the keys to hardware and
1557  *	fall back to software crypto. Note that this flag deals only with
1558  *	RX, if your crypto engine can't deal with TX you can also set the
1559  *	%IEEE80211_KEY_FLAG_SW_MGMT_TX flag to encrypt such frames in SW.
1560  * @IEEE80211_KEY_FLAG_GENERATE_IV_MGMT: This flag should be set by the
1561  *	driver for a CCMP/GCMP key to indicate that is requires IV generation
1562  *	only for managment frames (MFP).
1563  * @IEEE80211_KEY_FLAG_RESERVE_TAILROOM: This flag should be set by the
1564  *	driver for a key to indicate that sufficient tailroom must always
1565  *	be reserved for ICV or MIC, even when HW encryption is enabled.
1566  */
1567 enum ieee80211_key_flags {
1568 	IEEE80211_KEY_FLAG_GENERATE_IV_MGMT	= BIT(0),
1569 	IEEE80211_KEY_FLAG_GENERATE_IV		= BIT(1),
1570 	IEEE80211_KEY_FLAG_GENERATE_MMIC	= BIT(2),
1571 	IEEE80211_KEY_FLAG_PAIRWISE		= BIT(3),
1572 	IEEE80211_KEY_FLAG_SW_MGMT_TX		= BIT(4),
1573 	IEEE80211_KEY_FLAG_PUT_IV_SPACE		= BIT(5),
1574 	IEEE80211_KEY_FLAG_RX_MGMT		= BIT(6),
1575 	IEEE80211_KEY_FLAG_RESERVE_TAILROOM	= BIT(7),
1576 };
1577 
1578 /**
1579  * struct ieee80211_key_conf - key information
1580  *
1581  * This key information is given by mac80211 to the driver by
1582  * the set_key() callback in &struct ieee80211_ops.
1583  *
1584  * @hw_key_idx: To be set by the driver, this is the key index the driver
1585  *	wants to be given when a frame is transmitted and needs to be
1586  *	encrypted in hardware.
1587  * @cipher: The key's cipher suite selector.
1588  * @tx_pn: PN used for TX keys, may be used by the driver as well if it
1589  *	needs to do software PN assignment by itself (e.g. due to TSO)
1590  * @flags: key flags, see &enum ieee80211_key_flags.
1591  * @keyidx: the key index (0-3)
1592  * @keylen: key material length
1593  * @key: key material. For ALG_TKIP the key is encoded as a 256-bit (32 byte)
1594  * 	data block:
1595  * 	- Temporal Encryption Key (128 bits)
1596  * 	- Temporal Authenticator Tx MIC Key (64 bits)
1597  * 	- Temporal Authenticator Rx MIC Key (64 bits)
1598  * @icv_len: The ICV length for this key type
1599  * @iv_len: The IV length for this key type
1600  */
1601 struct ieee80211_key_conf {
1602 	atomic64_t tx_pn;
1603 	u32 cipher;
1604 	u8 icv_len;
1605 	u8 iv_len;
1606 	u8 hw_key_idx;
1607 	u8 flags;
1608 	s8 keyidx;
1609 	u8 keylen;
1610 	u8 key[0];
1611 };
1612 
1613 #define IEEE80211_MAX_PN_LEN	16
1614 
1615 #define TKIP_PN_TO_IV16(pn) ((u16)(pn & 0xffff))
1616 #define TKIP_PN_TO_IV32(pn) ((u32)((pn >> 16) & 0xffffffff))
1617 
1618 /**
1619  * struct ieee80211_key_seq - key sequence counter
1620  *
1621  * @tkip: TKIP data, containing IV32 and IV16 in host byte order
1622  * @ccmp: PN data, most significant byte first (big endian,
1623  *	reverse order than in packet)
1624  * @aes_cmac: PN data, most significant byte first (big endian,
1625  *	reverse order than in packet)
1626  * @aes_gmac: PN data, most significant byte first (big endian,
1627  *	reverse order than in packet)
1628  * @gcmp: PN data, most significant byte first (big endian,
1629  *	reverse order than in packet)
1630  * @hw: data for HW-only (e.g. cipher scheme) keys
1631  */
1632 struct ieee80211_key_seq {
1633 	union {
1634 		struct {
1635 			u32 iv32;
1636 			u16 iv16;
1637 		} tkip;
1638 		struct {
1639 			u8 pn[6];
1640 		} ccmp;
1641 		struct {
1642 			u8 pn[6];
1643 		} aes_cmac;
1644 		struct {
1645 			u8 pn[6];
1646 		} aes_gmac;
1647 		struct {
1648 			u8 pn[6];
1649 		} gcmp;
1650 		struct {
1651 			u8 seq[IEEE80211_MAX_PN_LEN];
1652 			u8 seq_len;
1653 		} hw;
1654 	};
1655 };
1656 
1657 /**
1658  * struct ieee80211_cipher_scheme - cipher scheme
1659  *
1660  * This structure contains a cipher scheme information defining
1661  * the secure packet crypto handling.
1662  *
1663  * @cipher: a cipher suite selector
1664  * @iftype: a cipher iftype bit mask indicating an allowed cipher usage
1665  * @hdr_len: a length of a security header used the cipher
1666  * @pn_len: a length of a packet number in the security header
1667  * @pn_off: an offset of pn from the beginning of the security header
1668  * @key_idx_off: an offset of key index byte in the security header
1669  * @key_idx_mask: a bit mask of key_idx bits
1670  * @key_idx_shift: a bit shift needed to get key_idx
1671  *     key_idx value calculation:
1672  *      (sec_header_base[key_idx_off] & key_idx_mask) >> key_idx_shift
1673  * @mic_len: a mic length in bytes
1674  */
1675 struct ieee80211_cipher_scheme {
1676 	u32 cipher;
1677 	u16 iftype;
1678 	u8 hdr_len;
1679 	u8 pn_len;
1680 	u8 pn_off;
1681 	u8 key_idx_off;
1682 	u8 key_idx_mask;
1683 	u8 key_idx_shift;
1684 	u8 mic_len;
1685 };
1686 
1687 /**
1688  * enum set_key_cmd - key command
1689  *
1690  * Used with the set_key() callback in &struct ieee80211_ops, this
1691  * indicates whether a key is being removed or added.
1692  *
1693  * @SET_KEY: a key is set
1694  * @DISABLE_KEY: a key must be disabled
1695  */
1696 enum set_key_cmd {
1697 	SET_KEY, DISABLE_KEY,
1698 };
1699 
1700 /**
1701  * enum ieee80211_sta_state - station state
1702  *
1703  * @IEEE80211_STA_NOTEXIST: station doesn't exist at all,
1704  *	this is a special state for add/remove transitions
1705  * @IEEE80211_STA_NONE: station exists without special state
1706  * @IEEE80211_STA_AUTH: station is authenticated
1707  * @IEEE80211_STA_ASSOC: station is associated
1708  * @IEEE80211_STA_AUTHORIZED: station is authorized (802.1X)
1709  */
1710 enum ieee80211_sta_state {
1711 	/* NOTE: These need to be ordered correctly! */
1712 	IEEE80211_STA_NOTEXIST,
1713 	IEEE80211_STA_NONE,
1714 	IEEE80211_STA_AUTH,
1715 	IEEE80211_STA_ASSOC,
1716 	IEEE80211_STA_AUTHORIZED,
1717 };
1718 
1719 /**
1720  * enum ieee80211_sta_rx_bandwidth - station RX bandwidth
1721  * @IEEE80211_STA_RX_BW_20: station can only receive 20 MHz
1722  * @IEEE80211_STA_RX_BW_40: station can receive up to 40 MHz
1723  * @IEEE80211_STA_RX_BW_80: station can receive up to 80 MHz
1724  * @IEEE80211_STA_RX_BW_160: station can receive up to 160 MHz
1725  *	(including 80+80 MHz)
1726  *
1727  * Implementation note: 20 must be zero to be initialized
1728  *	correctly, the values must be sorted.
1729  */
1730 enum ieee80211_sta_rx_bandwidth {
1731 	IEEE80211_STA_RX_BW_20 = 0,
1732 	IEEE80211_STA_RX_BW_40,
1733 	IEEE80211_STA_RX_BW_80,
1734 	IEEE80211_STA_RX_BW_160,
1735 };
1736 
1737 /**
1738  * struct ieee80211_sta_rates - station rate selection table
1739  *
1740  * @rcu_head: RCU head used for freeing the table on update
1741  * @rate: transmit rates/flags to be used by default.
1742  *	Overriding entries per-packet is possible by using cb tx control.
1743  */
1744 struct ieee80211_sta_rates {
1745 	struct rcu_head rcu_head;
1746 	struct {
1747 		s8 idx;
1748 		u8 count;
1749 		u8 count_cts;
1750 		u8 count_rts;
1751 		u16 flags;
1752 	} rate[IEEE80211_TX_RATE_TABLE_SIZE];
1753 };
1754 
1755 /**
1756  * struct ieee80211_sta - station table entry
1757  *
1758  * A station table entry represents a station we are possibly
1759  * communicating with. Since stations are RCU-managed in
1760  * mac80211, any ieee80211_sta pointer you get access to must
1761  * either be protected by rcu_read_lock() explicitly or implicitly,
1762  * or you must take good care to not use such a pointer after a
1763  * call to your sta_remove callback that removed it.
1764  *
1765  * @addr: MAC address
1766  * @aid: AID we assigned to the station if we're an AP
1767  * @supp_rates: Bitmap of supported rates (per band)
1768  * @ht_cap: HT capabilities of this STA; restricted to our own capabilities
1769  * @vht_cap: VHT capabilities of this STA; restricted to our own capabilities
1770  * @max_rx_aggregation_subframes: maximal amount of frames in a single AMPDU
1771  *	that this station is allowed to transmit to us.
1772  *	Can be modified by driver.
1773  * @wme: indicates whether the STA supports QoS/WME (if local devices does,
1774  *	otherwise always false)
1775  * @drv_priv: data area for driver use, will always be aligned to
1776  *	sizeof(void \*), size is determined in hw information.
1777  * @uapsd_queues: bitmap of queues configured for uapsd. Only valid
1778  *	if wme is supported. The bits order is like in
1779  *	IEEE80211_WMM_IE_STA_QOSINFO_AC_*.
1780  * @max_sp: max Service Period. Only valid if wme is supported.
1781  * @bandwidth: current bandwidth the station can receive with
1782  * @rx_nss: in HT/VHT, the maximum number of spatial streams the
1783  *	station can receive at the moment, changed by operating mode
1784  *	notifications and capabilities. The value is only valid after
1785  *	the station moves to associated state.
1786  * @smps_mode: current SMPS mode (off, static or dynamic)
1787  * @rates: rate control selection table
1788  * @tdls: indicates whether the STA is a TDLS peer
1789  * @tdls_initiator: indicates the STA is an initiator of the TDLS link. Only
1790  *	valid if the STA is a TDLS peer in the first place.
1791  * @mfp: indicates whether the STA uses management frame protection or not.
1792  * @max_amsdu_subframes: indicates the maximal number of MSDUs in a single
1793  *	A-MSDU. Taken from the Extended Capabilities element. 0 means
1794  *	unlimited.
1795  * @support_p2p_ps: indicates whether the STA supports P2P PS mechanism or not.
1796  * @max_rc_amsdu_len: Maximum A-MSDU size in bytes recommended by rate control.
1797  * @txq: per-TID data TX queues (if driver uses the TXQ abstraction)
1798  */
1799 struct ieee80211_sta {
1800 	u32 supp_rates[NUM_NL80211_BANDS];
1801 	u8 addr[ETH_ALEN];
1802 	u16 aid;
1803 	struct ieee80211_sta_ht_cap ht_cap;
1804 	struct ieee80211_sta_vht_cap vht_cap;
1805 	u8 max_rx_aggregation_subframes;
1806 	bool wme;
1807 	u8 uapsd_queues;
1808 	u8 max_sp;
1809 	u8 rx_nss;
1810 	enum ieee80211_sta_rx_bandwidth bandwidth;
1811 	enum ieee80211_smps_mode smps_mode;
1812 	struct ieee80211_sta_rates __rcu *rates;
1813 	bool tdls;
1814 	bool tdls_initiator;
1815 	bool mfp;
1816 	u8 max_amsdu_subframes;
1817 
1818 	/**
1819 	 * @max_amsdu_len:
1820 	 * indicates the maximal length of an A-MSDU in bytes.
1821 	 * This field is always valid for packets with a VHT preamble.
1822 	 * For packets with a HT preamble, additional limits apply:
1823 	 *
1824 	 * * If the skb is transmitted as part of a BA agreement, the
1825 	 *   A-MSDU maximal size is min(max_amsdu_len, 4065) bytes.
1826 	 * * If the skb is not part of a BA aggreement, the A-MSDU maximal
1827 	 *   size is min(max_amsdu_len, 7935) bytes.
1828 	 *
1829 	 * Both additional HT limits must be enforced by the low level
1830 	 * driver. This is defined by the spec (IEEE 802.11-2012 section
1831 	 * 8.3.2.2 NOTE 2).
1832 	 */
1833 	u16 max_amsdu_len;
1834 	bool support_p2p_ps;
1835 	u16 max_rc_amsdu_len;
1836 
1837 	struct ieee80211_txq *txq[IEEE80211_NUM_TIDS];
1838 
1839 	/* must be last */
1840 	u8 drv_priv[0] __aligned(sizeof(void *));
1841 };
1842 
1843 /**
1844  * enum sta_notify_cmd - sta notify command
1845  *
1846  * Used with the sta_notify() callback in &struct ieee80211_ops, this
1847  * indicates if an associated station made a power state transition.
1848  *
1849  * @STA_NOTIFY_SLEEP: a station is now sleeping
1850  * @STA_NOTIFY_AWAKE: a sleeping station woke up
1851  */
1852 enum sta_notify_cmd {
1853 	STA_NOTIFY_SLEEP, STA_NOTIFY_AWAKE,
1854 };
1855 
1856 /**
1857  * struct ieee80211_tx_control - TX control data
1858  *
1859  * @sta: station table entry, this sta pointer may be NULL and
1860  * 	it is not allowed to copy the pointer, due to RCU.
1861  */
1862 struct ieee80211_tx_control {
1863 	struct ieee80211_sta *sta;
1864 };
1865 
1866 /**
1867  * struct ieee80211_txq - Software intermediate tx queue
1868  *
1869  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
1870  * @sta: station table entry, %NULL for per-vif queue
1871  * @tid: the TID for this queue (unused for per-vif queue)
1872  * @ac: the AC for this queue
1873  * @drv_priv: driver private area, sized by hw->txq_data_size
1874  *
1875  * The driver can obtain packets from this queue by calling
1876  * ieee80211_tx_dequeue().
1877  */
1878 struct ieee80211_txq {
1879 	struct ieee80211_vif *vif;
1880 	struct ieee80211_sta *sta;
1881 	u8 tid;
1882 	u8 ac;
1883 
1884 	/* must be last */
1885 	u8 drv_priv[0] __aligned(sizeof(void *));
1886 };
1887 
1888 /**
1889  * enum ieee80211_hw_flags - hardware flags
1890  *
1891  * These flags are used to indicate hardware capabilities to
1892  * the stack. Generally, flags here should have their meaning
1893  * done in a way that the simplest hardware doesn't need setting
1894  * any particular flags. There are some exceptions to this rule,
1895  * however, so you are advised to review these flags carefully.
1896  *
1897  * @IEEE80211_HW_HAS_RATE_CONTROL:
1898  *	The hardware or firmware includes rate control, and cannot be
1899  *	controlled by the stack. As such, no rate control algorithm
1900  *	should be instantiated, and the TX rate reported to userspace
1901  *	will be taken from the TX status instead of the rate control
1902  *	algorithm.
1903  *	Note that this requires that the driver implement a number of
1904  *	callbacks so it has the correct information, it needs to have
1905  *	the @set_rts_threshold callback and must look at the BSS config
1906  *	@use_cts_prot for G/N protection, @use_short_slot for slot
1907  *	timing in 2.4 GHz and @use_short_preamble for preambles for
1908  *	CCK frames.
1909  *
1910  * @IEEE80211_HW_RX_INCLUDES_FCS:
1911  *	Indicates that received frames passed to the stack include
1912  *	the FCS at the end.
1913  *
1914  * @IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING:
1915  *	Some wireless LAN chipsets buffer broadcast/multicast frames
1916  *	for power saving stations in the hardware/firmware and others
1917  *	rely on the host system for such buffering. This option is used
1918  *	to configure the IEEE 802.11 upper layer to buffer broadcast and
1919  *	multicast frames when there are power saving stations so that
1920  *	the driver can fetch them with ieee80211_get_buffered_bc().
1921  *
1922  * @IEEE80211_HW_SIGNAL_UNSPEC:
1923  *	Hardware can provide signal values but we don't know its units. We
1924  *	expect values between 0 and @max_signal.
1925  *	If possible please provide dB or dBm instead.
1926  *
1927  * @IEEE80211_HW_SIGNAL_DBM:
1928  *	Hardware gives signal values in dBm, decibel difference from
1929  *	one milliwatt. This is the preferred method since it is standardized
1930  *	between different devices. @max_signal does not need to be set.
1931  *
1932  * @IEEE80211_HW_SPECTRUM_MGMT:
1933  * 	Hardware supports spectrum management defined in 802.11h
1934  * 	Measurement, Channel Switch, Quieting, TPC
1935  *
1936  * @IEEE80211_HW_AMPDU_AGGREGATION:
1937  *	Hardware supports 11n A-MPDU aggregation.
1938  *
1939  * @IEEE80211_HW_SUPPORTS_PS:
1940  *	Hardware has power save support (i.e. can go to sleep).
1941  *
1942  * @IEEE80211_HW_PS_NULLFUNC_STACK:
1943  *	Hardware requires nullfunc frame handling in stack, implies
1944  *	stack support for dynamic PS.
1945  *
1946  * @IEEE80211_HW_SUPPORTS_DYNAMIC_PS:
1947  *	Hardware has support for dynamic PS.
1948  *
1949  * @IEEE80211_HW_MFP_CAPABLE:
1950  *	Hardware supports management frame protection (MFP, IEEE 802.11w).
1951  *
1952  * @IEEE80211_HW_REPORTS_TX_ACK_STATUS:
1953  *	Hardware can provide ack status reports of Tx frames to
1954  *	the stack.
1955  *
1956  * @IEEE80211_HW_CONNECTION_MONITOR:
1957  *	The hardware performs its own connection monitoring, including
1958  *	periodic keep-alives to the AP and probing the AP on beacon loss.
1959  *
1960  * @IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC:
1961  *	This device needs to get data from beacon before association (i.e.
1962  *	dtim_period).
1963  *
1964  * @IEEE80211_HW_SUPPORTS_PER_STA_GTK: The device's crypto engine supports
1965  *	per-station GTKs as used by IBSS RSN or during fast transition. If
1966  *	the device doesn't support per-station GTKs, but can be asked not
1967  *	to decrypt group addressed frames, then IBSS RSN support is still
1968  *	possible but software crypto will be used. Advertise the wiphy flag
1969  *	only in that case.
1970  *
1971  * @IEEE80211_HW_AP_LINK_PS: When operating in AP mode the device
1972  *	autonomously manages the PS status of connected stations. When
1973  *	this flag is set mac80211 will not trigger PS mode for connected
1974  *	stations based on the PM bit of incoming frames.
1975  *	Use ieee80211_start_ps()/ieee8021_end_ps() to manually configure
1976  *	the PS mode of connected stations.
1977  *
1978  * @IEEE80211_HW_TX_AMPDU_SETUP_IN_HW: The device handles TX A-MPDU session
1979  *	setup strictly in HW. mac80211 should not attempt to do this in
1980  *	software.
1981  *
1982  * @IEEE80211_HW_WANT_MONITOR_VIF: The driver would like to be informed of
1983  *	a virtual monitor interface when monitor interfaces are the only
1984  *	active interfaces.
1985  *
1986  * @IEEE80211_HW_NO_AUTO_VIF: The driver would like for no wlanX to
1987  *	be created.  It is expected user-space will create vifs as
1988  *	desired (and thus have them named as desired).
1989  *
1990  * @IEEE80211_HW_SW_CRYPTO_CONTROL: The driver wants to control which of the
1991  *	crypto algorithms can be done in software - so don't automatically
1992  *	try to fall back to it if hardware crypto fails, but do so only if
1993  *	the driver returns 1. This also forces the driver to advertise its
1994  *	supported cipher suites.
1995  *
1996  * @IEEE80211_HW_SUPPORT_FAST_XMIT: The driver/hardware supports fast-xmit,
1997  *	this currently requires only the ability to calculate the duration
1998  *	for frames.
1999  *
2000  * @IEEE80211_HW_QUEUE_CONTROL: The driver wants to control per-interface
2001  *	queue mapping in order to use different queues (not just one per AC)
2002  *	for different virtual interfaces. See the doc section on HW queue
2003  *	control for more details.
2004  *
2005  * @IEEE80211_HW_SUPPORTS_RC_TABLE: The driver supports using a rate
2006  *	selection table provided by the rate control algorithm.
2007  *
2008  * @IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF: Use the P2P Device address for any
2009  *	P2P Interface. This will be honoured even if more than one interface
2010  *	is supported.
2011  *
2012  * @IEEE80211_HW_TIMING_BEACON_ONLY: Use sync timing from beacon frames
2013  *	only, to allow getting TBTT of a DTIM beacon.
2014  *
2015  * @IEEE80211_HW_SUPPORTS_HT_CCK_RATES: Hardware supports mixing HT/CCK rates
2016  *	and can cope with CCK rates in an aggregation session (e.g. by not
2017  *	using aggregation for such frames.)
2018  *
2019  * @IEEE80211_HW_CHANCTX_STA_CSA: Support 802.11h based channel-switch (CSA)
2020  *	for a single active channel while using channel contexts. When support
2021  *	is not enabled the default action is to disconnect when getting the
2022  *	CSA frame.
2023  *
2024  * @IEEE80211_HW_SUPPORTS_CLONED_SKBS: The driver will never modify the payload
2025  *	or tailroom of TX skbs without copying them first.
2026  *
2027  * @IEEE80211_HW_SINGLE_SCAN_ON_ALL_BANDS: The HW supports scanning on all bands
2028  *	in one command, mac80211 doesn't have to run separate scans per band.
2029  *
2030  * @IEEE80211_HW_TDLS_WIDER_BW: The device/driver supports wider bandwidth
2031  *	than then BSS bandwidth for a TDLS link on the base channel.
2032  *
2033  * @IEEE80211_HW_SUPPORTS_AMSDU_IN_AMPDU: The driver supports receiving A-MSDUs
2034  *	within A-MPDU.
2035  *
2036  * @IEEE80211_HW_BEACON_TX_STATUS: The device/driver provides TX status
2037  *	for sent beacons.
2038  *
2039  * @IEEE80211_HW_NEEDS_UNIQUE_STA_ADDR: Hardware (or driver) requires that each
2040  *	station has a unique address, i.e. each station entry can be identified
2041  *	by just its MAC address; this prevents, for example, the same station
2042  *	from connecting to two virtual AP interfaces at the same time.
2043  *
2044  * @IEEE80211_HW_SUPPORTS_REORDERING_BUFFER: Hardware (or driver) manages the
2045  *	reordering buffer internally, guaranteeing mac80211 receives frames in
2046  *	order and does not need to manage its own reorder buffer or BA session
2047  *	timeout.
2048  *
2049  * @IEEE80211_HW_USES_RSS: The device uses RSS and thus requires parallel RX,
2050  *	which implies using per-CPU station statistics.
2051  *
2052  * @IEEE80211_HW_TX_AMSDU: Hardware (or driver) supports software aggregated
2053  *	A-MSDU frames. Requires software tx queueing and fast-xmit support.
2054  *	When not using minstrel/minstrel_ht rate control, the driver must
2055  *	limit the maximum A-MSDU size based on the current tx rate by setting
2056  *	max_rc_amsdu_len in struct ieee80211_sta.
2057  *
2058  * @IEEE80211_HW_TX_FRAG_LIST: Hardware (or driver) supports sending frag_list
2059  *	skbs, needed for zero-copy software A-MSDU.
2060  *
2061  * @IEEE80211_HW_REPORTS_LOW_ACK: The driver (or firmware) reports low ack event
2062  *	by ieee80211_report_low_ack() based on its own algorithm. For such
2063  *	drivers, mac80211 packet loss mechanism will not be triggered and driver
2064  *	is completely depending on firmware event for station kickout.
2065  *
2066  * @IEEE80211_HW_SUPPORTS_TX_FRAG: Hardware does fragmentation by itself.
2067  *	The stack will not do fragmentation.
2068  *	The callback for @set_frag_threshold should be set as well.
2069  *
2070  * @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
2071  */
2072 enum ieee80211_hw_flags {
2073 	IEEE80211_HW_HAS_RATE_CONTROL,
2074 	IEEE80211_HW_RX_INCLUDES_FCS,
2075 	IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING,
2076 	IEEE80211_HW_SIGNAL_UNSPEC,
2077 	IEEE80211_HW_SIGNAL_DBM,
2078 	IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC,
2079 	IEEE80211_HW_SPECTRUM_MGMT,
2080 	IEEE80211_HW_AMPDU_AGGREGATION,
2081 	IEEE80211_HW_SUPPORTS_PS,
2082 	IEEE80211_HW_PS_NULLFUNC_STACK,
2083 	IEEE80211_HW_SUPPORTS_DYNAMIC_PS,
2084 	IEEE80211_HW_MFP_CAPABLE,
2085 	IEEE80211_HW_WANT_MONITOR_VIF,
2086 	IEEE80211_HW_NO_AUTO_VIF,
2087 	IEEE80211_HW_SW_CRYPTO_CONTROL,
2088 	IEEE80211_HW_SUPPORT_FAST_XMIT,
2089 	IEEE80211_HW_REPORTS_TX_ACK_STATUS,
2090 	IEEE80211_HW_CONNECTION_MONITOR,
2091 	IEEE80211_HW_QUEUE_CONTROL,
2092 	IEEE80211_HW_SUPPORTS_PER_STA_GTK,
2093 	IEEE80211_HW_AP_LINK_PS,
2094 	IEEE80211_HW_TX_AMPDU_SETUP_IN_HW,
2095 	IEEE80211_HW_SUPPORTS_RC_TABLE,
2096 	IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF,
2097 	IEEE80211_HW_TIMING_BEACON_ONLY,
2098 	IEEE80211_HW_SUPPORTS_HT_CCK_RATES,
2099 	IEEE80211_HW_CHANCTX_STA_CSA,
2100 	IEEE80211_HW_SUPPORTS_CLONED_SKBS,
2101 	IEEE80211_HW_SINGLE_SCAN_ON_ALL_BANDS,
2102 	IEEE80211_HW_TDLS_WIDER_BW,
2103 	IEEE80211_HW_SUPPORTS_AMSDU_IN_AMPDU,
2104 	IEEE80211_HW_BEACON_TX_STATUS,
2105 	IEEE80211_HW_NEEDS_UNIQUE_STA_ADDR,
2106 	IEEE80211_HW_SUPPORTS_REORDERING_BUFFER,
2107 	IEEE80211_HW_USES_RSS,
2108 	IEEE80211_HW_TX_AMSDU,
2109 	IEEE80211_HW_TX_FRAG_LIST,
2110 	IEEE80211_HW_REPORTS_LOW_ACK,
2111 	IEEE80211_HW_SUPPORTS_TX_FRAG,
2112 
2113 	/* keep last, obviously */
2114 	NUM_IEEE80211_HW_FLAGS
2115 };
2116 
2117 /**
2118  * struct ieee80211_hw - hardware information and state
2119  *
2120  * This structure contains the configuration and hardware
2121  * information for an 802.11 PHY.
2122  *
2123  * @wiphy: This points to the &struct wiphy allocated for this
2124  *	802.11 PHY. You must fill in the @perm_addr and @dev
2125  *	members of this structure using SET_IEEE80211_DEV()
2126  *	and SET_IEEE80211_PERM_ADDR(). Additionally, all supported
2127  *	bands (with channels, bitrates) are registered here.
2128  *
2129  * @conf: &struct ieee80211_conf, device configuration, don't use.
2130  *
2131  * @priv: pointer to private area that was allocated for driver use
2132  *	along with this structure.
2133  *
2134  * @flags: hardware flags, see &enum ieee80211_hw_flags.
2135  *
2136  * @extra_tx_headroom: headroom to reserve in each transmit skb
2137  *	for use by the driver (e.g. for transmit headers.)
2138  *
2139  * @extra_beacon_tailroom: tailroom to reserve in each beacon tx skb.
2140  *	Can be used by drivers to add extra IEs.
2141  *
2142  * @max_signal: Maximum value for signal (rssi) in RX information, used
2143  *	only when @IEEE80211_HW_SIGNAL_UNSPEC or @IEEE80211_HW_SIGNAL_DB
2144  *
2145  * @max_listen_interval: max listen interval in units of beacon interval
2146  *	that HW supports
2147  *
2148  * @queues: number of available hardware transmit queues for
2149  *	data packets. WMM/QoS requires at least four, these
2150  *	queues need to have configurable access parameters.
2151  *
2152  * @rate_control_algorithm: rate control algorithm for this hardware.
2153  *	If unset (NULL), the default algorithm will be used. Must be
2154  *	set before calling ieee80211_register_hw().
2155  *
2156  * @vif_data_size: size (in bytes) of the drv_priv data area
2157  *	within &struct ieee80211_vif.
2158  * @sta_data_size: size (in bytes) of the drv_priv data area
2159  *	within &struct ieee80211_sta.
2160  * @chanctx_data_size: size (in bytes) of the drv_priv data area
2161  *	within &struct ieee80211_chanctx_conf.
2162  * @txq_data_size: size (in bytes) of the drv_priv data area
2163  *	within @struct ieee80211_txq.
2164  *
2165  * @max_rates: maximum number of alternate rate retry stages the hw
2166  *	can handle.
2167  * @max_report_rates: maximum number of alternate rate retry stages
2168  *	the hw can report back.
2169  * @max_rate_tries: maximum number of tries for each stage
2170  *
2171  * @max_rx_aggregation_subframes: maximum buffer size (number of
2172  *	sub-frames) to be used for A-MPDU block ack receiver
2173  *	aggregation.
2174  *	This is only relevant if the device has restrictions on the
2175  *	number of subframes, if it relies on mac80211 to do reordering
2176  *	it shouldn't be set.
2177  *
2178  * @max_tx_aggregation_subframes: maximum number of subframes in an
2179  *	aggregate an HT driver will transmit. Though ADDBA will advertise
2180  *	a constant value of 64 as some older APs can crash if the window
2181  *	size is smaller (an example is LinkSys WRT120N with FW v1.0.07
2182  *	build 002 Jun 18 2012).
2183  *
2184  * @max_tx_fragments: maximum number of tx buffers per (A)-MSDU, sum
2185  *	of 1 + skb_shinfo(skb)->nr_frags for each skb in the frag_list.
2186  *
2187  * @offchannel_tx_hw_queue: HW queue ID to use for offchannel TX
2188  *	(if %IEEE80211_HW_QUEUE_CONTROL is set)
2189  *
2190  * @radiotap_mcs_details: lists which MCS information can the HW
2191  *	reports, by default it is set to _MCS, _GI and _BW but doesn't
2192  *	include _FMT. Use %IEEE80211_RADIOTAP_MCS_HAVE_\* values, only
2193  *	adding _BW is supported today.
2194  *
2195  * @radiotap_vht_details: lists which VHT MCS information the HW reports,
2196  *	the default is _GI | _BANDWIDTH.
2197  *	Use the %IEEE80211_RADIOTAP_VHT_KNOWN_\* values.
2198  *
2199  * @radiotap_timestamp: Information for the radiotap timestamp field; if the
2200  *	'units_pos' member is set to a non-negative value it must be set to
2201  *	a combination of a IEEE80211_RADIOTAP_TIMESTAMP_UNIT_* and a
2202  *	IEEE80211_RADIOTAP_TIMESTAMP_SPOS_* value, and then the timestamp
2203  *	field will be added and populated from the &struct ieee80211_rx_status
2204  *	device_timestamp. If the 'accuracy' member is non-negative, it's put
2205  *	into the accuracy radiotap field and the accuracy known flag is set.
2206  *
2207  * @netdev_features: netdev features to be set in each netdev created
2208  *	from this HW. Note that not all features are usable with mac80211,
2209  *	other features will be rejected during HW registration.
2210  *
2211  * @uapsd_queues: This bitmap is included in (re)association frame to indicate
2212  *	for each access category if it is uAPSD trigger-enabled and delivery-
2213  *	enabled. Use IEEE80211_WMM_IE_STA_QOSINFO_AC_* to set this bitmap.
2214  *	Each bit corresponds to different AC. Value '1' in specific bit means
2215  *	that corresponding AC is both trigger- and delivery-enabled. '0' means
2216  *	neither enabled.
2217  *
2218  * @uapsd_max_sp_len: maximum number of total buffered frames the WMM AP may
2219  *	deliver to a WMM STA during any Service Period triggered by the WMM STA.
2220  *	Use IEEE80211_WMM_IE_STA_QOSINFO_SP_* for correct values.
2221  *
2222  * @n_cipher_schemes: a size of an array of cipher schemes definitions.
2223  * @cipher_schemes: a pointer to an array of cipher scheme definitions
2224  *	supported by HW.
2225  * @max_nan_de_entries: maximum number of NAN DE functions supported by the
2226  *	device.
2227  */
2228 struct ieee80211_hw {
2229 	struct ieee80211_conf conf;
2230 	struct wiphy *wiphy;
2231 	const char *rate_control_algorithm;
2232 	void *priv;
2233 	unsigned long flags[BITS_TO_LONGS(NUM_IEEE80211_HW_FLAGS)];
2234 	unsigned int extra_tx_headroom;
2235 	unsigned int extra_beacon_tailroom;
2236 	int vif_data_size;
2237 	int sta_data_size;
2238 	int chanctx_data_size;
2239 	int txq_data_size;
2240 	u16 queues;
2241 	u16 max_listen_interval;
2242 	s8 max_signal;
2243 	u8 max_rates;
2244 	u8 max_report_rates;
2245 	u8 max_rate_tries;
2246 	u8 max_rx_aggregation_subframes;
2247 	u8 max_tx_aggregation_subframes;
2248 	u8 max_tx_fragments;
2249 	u8 offchannel_tx_hw_queue;
2250 	u8 radiotap_mcs_details;
2251 	u16 radiotap_vht_details;
2252 	struct {
2253 		int units_pos;
2254 		s16 accuracy;
2255 	} radiotap_timestamp;
2256 	netdev_features_t netdev_features;
2257 	u8 uapsd_queues;
2258 	u8 uapsd_max_sp_len;
2259 	u8 n_cipher_schemes;
2260 	const struct ieee80211_cipher_scheme *cipher_schemes;
2261 	u8 max_nan_de_entries;
2262 };
2263 
2264 static inline bool _ieee80211_hw_check(struct ieee80211_hw *hw,
2265 				       enum ieee80211_hw_flags flg)
2266 {
2267 	return test_bit(flg, hw->flags);
2268 }
2269 #define ieee80211_hw_check(hw, flg)	_ieee80211_hw_check(hw, IEEE80211_HW_##flg)
2270 
2271 static inline void _ieee80211_hw_set(struct ieee80211_hw *hw,
2272 				     enum ieee80211_hw_flags flg)
2273 {
2274 	return __set_bit(flg, hw->flags);
2275 }
2276 #define ieee80211_hw_set(hw, flg)	_ieee80211_hw_set(hw, IEEE80211_HW_##flg)
2277 
2278 /**
2279  * struct ieee80211_scan_request - hw scan request
2280  *
2281  * @ies: pointers different parts of IEs (in req.ie)
2282  * @req: cfg80211 request.
2283  */
2284 struct ieee80211_scan_request {
2285 	struct ieee80211_scan_ies ies;
2286 
2287 	/* Keep last */
2288 	struct cfg80211_scan_request req;
2289 };
2290 
2291 /**
2292  * struct ieee80211_tdls_ch_sw_params - TDLS channel switch parameters
2293  *
2294  * @sta: peer this TDLS channel-switch request/response came from
2295  * @chandef: channel referenced in a TDLS channel-switch request
2296  * @action_code: see &enum ieee80211_tdls_actioncode
2297  * @status: channel-switch response status
2298  * @timestamp: time at which the frame was received
2299  * @switch_time: switch-timing parameter received in the frame
2300  * @switch_timeout: switch-timing parameter received in the frame
2301  * @tmpl_skb: TDLS switch-channel response template
2302  * @ch_sw_tm_ie: offset of the channel-switch timing IE inside @tmpl_skb
2303  */
2304 struct ieee80211_tdls_ch_sw_params {
2305 	struct ieee80211_sta *sta;
2306 	struct cfg80211_chan_def *chandef;
2307 	u8 action_code;
2308 	u32 status;
2309 	u32 timestamp;
2310 	u16 switch_time;
2311 	u16 switch_timeout;
2312 	struct sk_buff *tmpl_skb;
2313 	u32 ch_sw_tm_ie;
2314 };
2315 
2316 /**
2317  * wiphy_to_ieee80211_hw - return a mac80211 driver hw struct from a wiphy
2318  *
2319  * @wiphy: the &struct wiphy which we want to query
2320  *
2321  * mac80211 drivers can use this to get to their respective
2322  * &struct ieee80211_hw. Drivers wishing to get to their own private
2323  * structure can then access it via hw->priv. Note that mac802111 drivers should
2324  * not use wiphy_priv() to try to get their private driver structure as this
2325  * is already used internally by mac80211.
2326  *
2327  * Return: The mac80211 driver hw struct of @wiphy.
2328  */
2329 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy);
2330 
2331 /**
2332  * SET_IEEE80211_DEV - set device for 802.11 hardware
2333  *
2334  * @hw: the &struct ieee80211_hw to set the device for
2335  * @dev: the &struct device of this 802.11 device
2336  */
2337 static inline void SET_IEEE80211_DEV(struct ieee80211_hw *hw, struct device *dev)
2338 {
2339 	set_wiphy_dev(hw->wiphy, dev);
2340 }
2341 
2342 /**
2343  * SET_IEEE80211_PERM_ADDR - set the permanent MAC address for 802.11 hardware
2344  *
2345  * @hw: the &struct ieee80211_hw to set the MAC address for
2346  * @addr: the address to set
2347  */
2348 static inline void SET_IEEE80211_PERM_ADDR(struct ieee80211_hw *hw, const u8 *addr)
2349 {
2350 	memcpy(hw->wiphy->perm_addr, addr, ETH_ALEN);
2351 }
2352 
2353 static inline struct ieee80211_rate *
2354 ieee80211_get_tx_rate(const struct ieee80211_hw *hw,
2355 		      const struct ieee80211_tx_info *c)
2356 {
2357 	if (WARN_ON_ONCE(c->control.rates[0].idx < 0))
2358 		return NULL;
2359 	return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[0].idx];
2360 }
2361 
2362 static inline struct ieee80211_rate *
2363 ieee80211_get_rts_cts_rate(const struct ieee80211_hw *hw,
2364 			   const struct ieee80211_tx_info *c)
2365 {
2366 	if (c->control.rts_cts_rate_idx < 0)
2367 		return NULL;
2368 	return &hw->wiphy->bands[c->band]->bitrates[c->control.rts_cts_rate_idx];
2369 }
2370 
2371 static inline struct ieee80211_rate *
2372 ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
2373 			     const struct ieee80211_tx_info *c, int idx)
2374 {
2375 	if (c->control.rates[idx + 1].idx < 0)
2376 		return NULL;
2377 	return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[idx + 1].idx];
2378 }
2379 
2380 /**
2381  * ieee80211_free_txskb - free TX skb
2382  * @hw: the hardware
2383  * @skb: the skb
2384  *
2385  * Free a transmit skb. Use this funtion when some failure
2386  * to transmit happened and thus status cannot be reported.
2387  */
2388 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb);
2389 
2390 /**
2391  * DOC: Hardware crypto acceleration
2392  *
2393  * mac80211 is capable of taking advantage of many hardware
2394  * acceleration designs for encryption and decryption operations.
2395  *
2396  * The set_key() callback in the &struct ieee80211_ops for a given
2397  * device is called to enable hardware acceleration of encryption and
2398  * decryption. The callback takes a @sta parameter that will be NULL
2399  * for default keys or keys used for transmission only, or point to
2400  * the station information for the peer for individual keys.
2401  * Multiple transmission keys with the same key index may be used when
2402  * VLANs are configured for an access point.
2403  *
2404  * When transmitting, the TX control data will use the @hw_key_idx
2405  * selected by the driver by modifying the &struct ieee80211_key_conf
2406  * pointed to by the @key parameter to the set_key() function.
2407  *
2408  * The set_key() call for the %SET_KEY command should return 0 if
2409  * the key is now in use, -%EOPNOTSUPP or -%ENOSPC if it couldn't be
2410  * added; if you return 0 then hw_key_idx must be assigned to the
2411  * hardware key index, you are free to use the full u8 range.
2412  *
2413  * Note that in the case that the @IEEE80211_HW_SW_CRYPTO_CONTROL flag is
2414  * set, mac80211 will not automatically fall back to software crypto if
2415  * enabling hardware crypto failed. The set_key() call may also return the
2416  * value 1 to permit this specific key/algorithm to be done in software.
2417  *
2418  * When the cmd is %DISABLE_KEY then it must succeed.
2419  *
2420  * Note that it is permissible to not decrypt a frame even if a key
2421  * for it has been uploaded to hardware, the stack will not make any
2422  * decision based on whether a key has been uploaded or not but rather
2423  * based on the receive flags.
2424  *
2425  * The &struct ieee80211_key_conf structure pointed to by the @key
2426  * parameter is guaranteed to be valid until another call to set_key()
2427  * removes it, but it can only be used as a cookie to differentiate
2428  * keys.
2429  *
2430  * In TKIP some HW need to be provided a phase 1 key, for RX decryption
2431  * acceleration (i.e. iwlwifi). Those drivers should provide update_tkip_key
2432  * handler.
2433  * The update_tkip_key() call updates the driver with the new phase 1 key.
2434  * This happens every time the iv16 wraps around (every 65536 packets). The
2435  * set_key() call will happen only once for each key (unless the AP did
2436  * rekeying), it will not include a valid phase 1 key. The valid phase 1 key is
2437  * provided by update_tkip_key only. The trigger that makes mac80211 call this
2438  * handler is software decryption with wrap around of iv16.
2439  *
2440  * The set_default_unicast_key() call updates the default WEP key index
2441  * configured to the hardware for WEP encryption type. This is required
2442  * for devices that support offload of data packets (e.g. ARP responses).
2443  */
2444 
2445 /**
2446  * DOC: Powersave support
2447  *
2448  * mac80211 has support for various powersave implementations.
2449  *
2450  * First, it can support hardware that handles all powersaving by itself,
2451  * such hardware should simply set the %IEEE80211_HW_SUPPORTS_PS hardware
2452  * flag. In that case, it will be told about the desired powersave mode
2453  * with the %IEEE80211_CONF_PS flag depending on the association status.
2454  * The hardware must take care of sending nullfunc frames when necessary,
2455  * i.e. when entering and leaving powersave mode. The hardware is required
2456  * to look at the AID in beacons and signal to the AP that it woke up when
2457  * it finds traffic directed to it.
2458  *
2459  * %IEEE80211_CONF_PS flag enabled means that the powersave mode defined in
2460  * IEEE 802.11-2007 section 11.2 is enabled. This is not to be confused
2461  * with hardware wakeup and sleep states. Driver is responsible for waking
2462  * up the hardware before issuing commands to the hardware and putting it
2463  * back to sleep at appropriate times.
2464  *
2465  * When PS is enabled, hardware needs to wakeup for beacons and receive the
2466  * buffered multicast/broadcast frames after the beacon. Also it must be
2467  * possible to send frames and receive the acknowledment frame.
2468  *
2469  * Other hardware designs cannot send nullfunc frames by themselves and also
2470  * need software support for parsing the TIM bitmap. This is also supported
2471  * by mac80211 by combining the %IEEE80211_HW_SUPPORTS_PS and
2472  * %IEEE80211_HW_PS_NULLFUNC_STACK flags. The hardware is of course still
2473  * required to pass up beacons. The hardware is still required to handle
2474  * waking up for multicast traffic; if it cannot the driver must handle that
2475  * as best as it can, mac80211 is too slow to do that.
2476  *
2477  * Dynamic powersave is an extension to normal powersave in which the
2478  * hardware stays awake for a user-specified period of time after sending a
2479  * frame so that reply frames need not be buffered and therefore delayed to
2480  * the next wakeup. It's compromise of getting good enough latency when
2481  * there's data traffic and still saving significantly power in idle
2482  * periods.
2483  *
2484  * Dynamic powersave is simply supported by mac80211 enabling and disabling
2485  * PS based on traffic. Driver needs to only set %IEEE80211_HW_SUPPORTS_PS
2486  * flag and mac80211 will handle everything automatically. Additionally,
2487  * hardware having support for the dynamic PS feature may set the
2488  * %IEEE80211_HW_SUPPORTS_DYNAMIC_PS flag to indicate that it can support
2489  * dynamic PS mode itself. The driver needs to look at the
2490  * @dynamic_ps_timeout hardware configuration value and use it that value
2491  * whenever %IEEE80211_CONF_PS is set. In this case mac80211 will disable
2492  * dynamic PS feature in stack and will just keep %IEEE80211_CONF_PS
2493  * enabled whenever user has enabled powersave.
2494  *
2495  * Driver informs U-APSD client support by enabling
2496  * %IEEE80211_VIF_SUPPORTS_UAPSD flag. The mode is configured through the
2497  * uapsd parameter in conf_tx() operation. Hardware needs to send the QoS
2498  * Nullfunc frames and stay awake until the service period has ended. To
2499  * utilize U-APSD, dynamic powersave is disabled for voip AC and all frames
2500  * from that AC are transmitted with powersave enabled.
2501  *
2502  * Note: U-APSD client mode is not yet supported with
2503  * %IEEE80211_HW_PS_NULLFUNC_STACK.
2504  */
2505 
2506 /**
2507  * DOC: Beacon filter support
2508  *
2509  * Some hardware have beacon filter support to reduce host cpu wakeups
2510  * which will reduce system power consumption. It usually works so that
2511  * the firmware creates a checksum of the beacon but omits all constantly
2512  * changing elements (TSF, TIM etc). Whenever the checksum changes the
2513  * beacon is forwarded to the host, otherwise it will be just dropped. That
2514  * way the host will only receive beacons where some relevant information
2515  * (for example ERP protection or WMM settings) have changed.
2516  *
2517  * Beacon filter support is advertised with the %IEEE80211_VIF_BEACON_FILTER
2518  * interface capability. The driver needs to enable beacon filter support
2519  * whenever power save is enabled, that is %IEEE80211_CONF_PS is set. When
2520  * power save is enabled, the stack will not check for beacon loss and the
2521  * driver needs to notify about loss of beacons with ieee80211_beacon_loss().
2522  *
2523  * The time (or number of beacons missed) until the firmware notifies the
2524  * driver of a beacon loss event (which in turn causes the driver to call
2525  * ieee80211_beacon_loss()) should be configurable and will be controlled
2526  * by mac80211 and the roaming algorithm in the future.
2527  *
2528  * Since there may be constantly changing information elements that nothing
2529  * in the software stack cares about, we will, in the future, have mac80211
2530  * tell the driver which information elements are interesting in the sense
2531  * that we want to see changes in them. This will include
2532  *
2533  *  - a list of information element IDs
2534  *  - a list of OUIs for the vendor information element
2535  *
2536  * Ideally, the hardware would filter out any beacons without changes in the
2537  * requested elements, but if it cannot support that it may, at the expense
2538  * of some efficiency, filter out only a subset. For example, if the device
2539  * doesn't support checking for OUIs it should pass up all changes in all
2540  * vendor information elements.
2541  *
2542  * Note that change, for the sake of simplification, also includes information
2543  * elements appearing or disappearing from the beacon.
2544  *
2545  * Some hardware supports an "ignore list" instead, just make sure nothing
2546  * that was requested is on the ignore list, and include commonly changing
2547  * information element IDs in the ignore list, for example 11 (BSS load) and
2548  * the various vendor-assigned IEs with unknown contents (128, 129, 133-136,
2549  * 149, 150, 155, 156, 173, 176, 178, 179, 219); for forward compatibility
2550  * it could also include some currently unused IDs.
2551  *
2552  *
2553  * In addition to these capabilities, hardware should support notifying the
2554  * host of changes in the beacon RSSI. This is relevant to implement roaming
2555  * when no traffic is flowing (when traffic is flowing we see the RSSI of
2556  * the received data packets). This can consist in notifying the host when
2557  * the RSSI changes significantly or when it drops below or rises above
2558  * configurable thresholds. In the future these thresholds will also be
2559  * configured by mac80211 (which gets them from userspace) to implement
2560  * them as the roaming algorithm requires.
2561  *
2562  * If the hardware cannot implement this, the driver should ask it to
2563  * periodically pass beacon frames to the host so that software can do the
2564  * signal strength threshold checking.
2565  */
2566 
2567 /**
2568  * DOC: Spatial multiplexing power save
2569  *
2570  * SMPS (Spatial multiplexing power save) is a mechanism to conserve
2571  * power in an 802.11n implementation. For details on the mechanism
2572  * and rationale, please refer to 802.11 (as amended by 802.11n-2009)
2573  * "11.2.3 SM power save".
2574  *
2575  * The mac80211 implementation is capable of sending action frames
2576  * to update the AP about the station's SMPS mode, and will instruct
2577  * the driver to enter the specific mode. It will also announce the
2578  * requested SMPS mode during the association handshake. Hardware
2579  * support for this feature is required, and can be indicated by
2580  * hardware flags.
2581  *
2582  * The default mode will be "automatic", which nl80211/cfg80211
2583  * defines to be dynamic SMPS in (regular) powersave, and SMPS
2584  * turned off otherwise.
2585  *
2586  * To support this feature, the driver must set the appropriate
2587  * hardware support flags, and handle the SMPS flag to the config()
2588  * operation. It will then with this mechanism be instructed to
2589  * enter the requested SMPS mode while associated to an HT AP.
2590  */
2591 
2592 /**
2593  * DOC: Frame filtering
2594  *
2595  * mac80211 requires to see many management frames for proper
2596  * operation, and users may want to see many more frames when
2597  * in monitor mode. However, for best CPU usage and power consumption,
2598  * having as few frames as possible percolate through the stack is
2599  * desirable. Hence, the hardware should filter as much as possible.
2600  *
2601  * To achieve this, mac80211 uses filter flags (see below) to tell
2602  * the driver's configure_filter() function which frames should be
2603  * passed to mac80211 and which should be filtered out.
2604  *
2605  * Before configure_filter() is invoked, the prepare_multicast()
2606  * callback is invoked with the parameters @mc_count and @mc_list
2607  * for the combined multicast address list of all virtual interfaces.
2608  * It's use is optional, and it returns a u64 that is passed to
2609  * configure_filter(). Additionally, configure_filter() has the
2610  * arguments @changed_flags telling which flags were changed and
2611  * @total_flags with the new flag states.
2612  *
2613  * If your device has no multicast address filters your driver will
2614  * need to check both the %FIF_ALLMULTI flag and the @mc_count
2615  * parameter to see whether multicast frames should be accepted
2616  * or dropped.
2617  *
2618  * All unsupported flags in @total_flags must be cleared.
2619  * Hardware does not support a flag if it is incapable of _passing_
2620  * the frame to the stack. Otherwise the driver must ignore
2621  * the flag, but not clear it.
2622  * You must _only_ clear the flag (announce no support for the
2623  * flag to mac80211) if you are not able to pass the packet type
2624  * to the stack (so the hardware always filters it).
2625  * So for example, you should clear @FIF_CONTROL, if your hardware
2626  * always filters control frames. If your hardware always passes
2627  * control frames to the kernel and is incapable of filtering them,
2628  * you do _not_ clear the @FIF_CONTROL flag.
2629  * This rule applies to all other FIF flags as well.
2630  */
2631 
2632 /**
2633  * DOC: AP support for powersaving clients
2634  *
2635  * In order to implement AP and P2P GO modes, mac80211 has support for
2636  * client powersaving, both "legacy" PS (PS-Poll/null data) and uAPSD.
2637  * There currently is no support for sAPSD.
2638  *
2639  * There is one assumption that mac80211 makes, namely that a client
2640  * will not poll with PS-Poll and trigger with uAPSD at the same time.
2641  * Both are supported, and both can be used by the same client, but
2642  * they can't be used concurrently by the same client. This simplifies
2643  * the driver code.
2644  *
2645  * The first thing to keep in mind is that there is a flag for complete
2646  * driver implementation: %IEEE80211_HW_AP_LINK_PS. If this flag is set,
2647  * mac80211 expects the driver to handle most of the state machine for
2648  * powersaving clients and will ignore the PM bit in incoming frames.
2649  * Drivers then use ieee80211_sta_ps_transition() to inform mac80211 of
2650  * stations' powersave transitions. In this mode, mac80211 also doesn't
2651  * handle PS-Poll/uAPSD.
2652  *
2653  * In the mode without %IEEE80211_HW_AP_LINK_PS, mac80211 will check the
2654  * PM bit in incoming frames for client powersave transitions. When a
2655  * station goes to sleep, we will stop transmitting to it. There is,
2656  * however, a race condition: a station might go to sleep while there is
2657  * data buffered on hardware queues. If the device has support for this
2658  * it will reject frames, and the driver should give the frames back to
2659  * mac80211 with the %IEEE80211_TX_STAT_TX_FILTERED flag set which will
2660  * cause mac80211 to retry the frame when the station wakes up. The
2661  * driver is also notified of powersave transitions by calling its
2662  * @sta_notify callback.
2663  *
2664  * When the station is asleep, it has three choices: it can wake up,
2665  * it can PS-Poll, or it can possibly start a uAPSD service period.
2666  * Waking up is implemented by simply transmitting all buffered (and
2667  * filtered) frames to the station. This is the easiest case. When
2668  * the station sends a PS-Poll or a uAPSD trigger frame, mac80211
2669  * will inform the driver of this with the @allow_buffered_frames
2670  * callback; this callback is optional. mac80211 will then transmit
2671  * the frames as usual and set the %IEEE80211_TX_CTL_NO_PS_BUFFER
2672  * on each frame. The last frame in the service period (or the only
2673  * response to a PS-Poll) also has %IEEE80211_TX_STATUS_EOSP set to
2674  * indicate that it ends the service period; as this frame must have
2675  * TX status report it also sets %IEEE80211_TX_CTL_REQ_TX_STATUS.
2676  * When TX status is reported for this frame, the service period is
2677  * marked has having ended and a new one can be started by the peer.
2678  *
2679  * Additionally, non-bufferable MMPDUs can also be transmitted by
2680  * mac80211 with the %IEEE80211_TX_CTL_NO_PS_BUFFER set in them.
2681  *
2682  * Another race condition can happen on some devices like iwlwifi
2683  * when there are frames queued for the station and it wakes up
2684  * or polls; the frames that are already queued could end up being
2685  * transmitted first instead, causing reordering and/or wrong
2686  * processing of the EOSP. The cause is that allowing frames to be
2687  * transmitted to a certain station is out-of-band communication to
2688  * the device. To allow this problem to be solved, the driver can
2689  * call ieee80211_sta_block_awake() if frames are buffered when it
2690  * is notified that the station went to sleep. When all these frames
2691  * have been filtered (see above), it must call the function again
2692  * to indicate that the station is no longer blocked.
2693  *
2694  * If the driver buffers frames in the driver for aggregation in any
2695  * way, it must use the ieee80211_sta_set_buffered() call when it is
2696  * notified of the station going to sleep to inform mac80211 of any
2697  * TIDs that have frames buffered. Note that when a station wakes up
2698  * this information is reset (hence the requirement to call it when
2699  * informed of the station going to sleep). Then, when a service
2700  * period starts for any reason, @release_buffered_frames is called
2701  * with the number of frames to be released and which TIDs they are
2702  * to come from. In this case, the driver is responsible for setting
2703  * the EOSP (for uAPSD) and MORE_DATA bits in the released frames,
2704  * to help the @more_data parameter is passed to tell the driver if
2705  * there is more data on other TIDs -- the TIDs to release frames
2706  * from are ignored since mac80211 doesn't know how many frames the
2707  * buffers for those TIDs contain.
2708  *
2709  * If the driver also implement GO mode, where absence periods may
2710  * shorten service periods (or abort PS-Poll responses), it must
2711  * filter those response frames except in the case of frames that
2712  * are buffered in the driver -- those must remain buffered to avoid
2713  * reordering. Because it is possible that no frames are released
2714  * in this case, the driver must call ieee80211_sta_eosp()
2715  * to indicate to mac80211 that the service period ended anyway.
2716  *
2717  * Finally, if frames from multiple TIDs are released from mac80211
2718  * but the driver might reorder them, it must clear & set the flags
2719  * appropriately (only the last frame may have %IEEE80211_TX_STATUS_EOSP)
2720  * and also take care of the EOSP and MORE_DATA bits in the frame.
2721  * The driver may also use ieee80211_sta_eosp() in this case.
2722  *
2723  * Note that if the driver ever buffers frames other than QoS-data
2724  * frames, it must take care to never send a non-QoS-data frame as
2725  * the last frame in a service period, adding a QoS-nulldata frame
2726  * after a non-QoS-data frame if needed.
2727  */
2728 
2729 /**
2730  * DOC: HW queue control
2731  *
2732  * Before HW queue control was introduced, mac80211 only had a single static
2733  * assignment of per-interface AC software queues to hardware queues. This
2734  * was problematic for a few reasons:
2735  * 1) off-channel transmissions might get stuck behind other frames
2736  * 2) multiple virtual interfaces couldn't be handled correctly
2737  * 3) after-DTIM frames could get stuck behind other frames
2738  *
2739  * To solve this, hardware typically uses multiple different queues for all
2740  * the different usages, and this needs to be propagated into mac80211 so it
2741  * won't have the same problem with the software queues.
2742  *
2743  * Therefore, mac80211 now offers the %IEEE80211_HW_QUEUE_CONTROL capability
2744  * flag that tells it that the driver implements its own queue control. To do
2745  * so, the driver will set up the various queues in each &struct ieee80211_vif
2746  * and the offchannel queue in &struct ieee80211_hw. In response, mac80211 will
2747  * use those queue IDs in the hw_queue field of &struct ieee80211_tx_info and
2748  * if necessary will queue the frame on the right software queue that mirrors
2749  * the hardware queue.
2750  * Additionally, the driver has to then use these HW queue IDs for the queue
2751  * management functions (ieee80211_stop_queue() et al.)
2752  *
2753  * The driver is free to set up the queue mappings as needed, multiple virtual
2754  * interfaces may map to the same hardware queues if needed. The setup has to
2755  * happen during add_interface or change_interface callbacks. For example, a
2756  * driver supporting station+station and station+AP modes might decide to have
2757  * 10 hardware queues to handle different scenarios:
2758  *
2759  * 4 AC HW queues for 1st vif: 0, 1, 2, 3
2760  * 4 AC HW queues for 2nd vif: 4, 5, 6, 7
2761  * after-DTIM queue for AP:   8
2762  * off-channel queue:         9
2763  *
2764  * It would then set up the hardware like this:
2765  *   hw.offchannel_tx_hw_queue = 9
2766  *
2767  * and the first virtual interface that is added as follows:
2768  *   vif.hw_queue[IEEE80211_AC_VO] = 0
2769  *   vif.hw_queue[IEEE80211_AC_VI] = 1
2770  *   vif.hw_queue[IEEE80211_AC_BE] = 2
2771  *   vif.hw_queue[IEEE80211_AC_BK] = 3
2772  *   vif.cab_queue = 8 // if AP mode, otherwise %IEEE80211_INVAL_HW_QUEUE
2773  * and the second virtual interface with 4-7.
2774  *
2775  * If queue 6 gets full, for example, mac80211 would only stop the second
2776  * virtual interface's BE queue since virtual interface queues are per AC.
2777  *
2778  * Note that the vif.cab_queue value should be set to %IEEE80211_INVAL_HW_QUEUE
2779  * whenever the queue is not used (i.e. the interface is not in AP mode) if the
2780  * queue could potentially be shared since mac80211 will look at cab_queue when
2781  * a queue is stopped/woken even if the interface is not in AP mode.
2782  */
2783 
2784 /**
2785  * enum ieee80211_filter_flags - hardware filter flags
2786  *
2787  * These flags determine what the filter in hardware should be
2788  * programmed to let through and what should not be passed to the
2789  * stack. It is always safe to pass more frames than requested,
2790  * but this has negative impact on power consumption.
2791  *
2792  * @FIF_ALLMULTI: pass all multicast frames, this is used if requested
2793  *	by the user or if the hardware is not capable of filtering by
2794  *	multicast address.
2795  *
2796  * @FIF_FCSFAIL: pass frames with failed FCS (but you need to set the
2797  *	%RX_FLAG_FAILED_FCS_CRC for them)
2798  *
2799  * @FIF_PLCPFAIL: pass frames with failed PLCP CRC (but you need to set
2800  *	the %RX_FLAG_FAILED_PLCP_CRC for them
2801  *
2802  * @FIF_BCN_PRBRESP_PROMISC: This flag is set during scanning to indicate
2803  *	to the hardware that it should not filter beacons or probe responses
2804  *	by BSSID. Filtering them can greatly reduce the amount of processing
2805  *	mac80211 needs to do and the amount of CPU wakeups, so you should
2806  *	honour this flag if possible.
2807  *
2808  * @FIF_CONTROL: pass control frames (except for PS Poll) addressed to this
2809  *	station
2810  *
2811  * @FIF_OTHER_BSS: pass frames destined to other BSSes
2812  *
2813  * @FIF_PSPOLL: pass PS Poll frames
2814  *
2815  * @FIF_PROBE_REQ: pass probe request frames
2816  */
2817 enum ieee80211_filter_flags {
2818 	FIF_ALLMULTI		= 1<<1,
2819 	FIF_FCSFAIL		= 1<<2,
2820 	FIF_PLCPFAIL		= 1<<3,
2821 	FIF_BCN_PRBRESP_PROMISC	= 1<<4,
2822 	FIF_CONTROL		= 1<<5,
2823 	FIF_OTHER_BSS		= 1<<6,
2824 	FIF_PSPOLL		= 1<<7,
2825 	FIF_PROBE_REQ		= 1<<8,
2826 };
2827 
2828 /**
2829  * enum ieee80211_ampdu_mlme_action - A-MPDU actions
2830  *
2831  * These flags are used with the ampdu_action() callback in
2832  * &struct ieee80211_ops to indicate which action is needed.
2833  *
2834  * Note that drivers MUST be able to deal with a TX aggregation
2835  * session being stopped even before they OK'ed starting it by
2836  * calling ieee80211_start_tx_ba_cb_irqsafe, because the peer
2837  * might receive the addBA frame and send a delBA right away!
2838  *
2839  * @IEEE80211_AMPDU_RX_START: start RX aggregation
2840  * @IEEE80211_AMPDU_RX_STOP: stop RX aggregation
2841  * @IEEE80211_AMPDU_TX_START: start TX aggregation
2842  * @IEEE80211_AMPDU_TX_OPERATIONAL: TX aggregation has become operational
2843  * @IEEE80211_AMPDU_TX_STOP_CONT: stop TX aggregation but continue transmitting
2844  *	queued packets, now unaggregated. After all packets are transmitted the
2845  *	driver has to call ieee80211_stop_tx_ba_cb_irqsafe().
2846  * @IEEE80211_AMPDU_TX_STOP_FLUSH: stop TX aggregation and flush all packets,
2847  *	called when the station is removed. There's no need or reason to call
2848  *	ieee80211_stop_tx_ba_cb_irqsafe() in this case as mac80211 assumes the
2849  *	session is gone and removes the station.
2850  * @IEEE80211_AMPDU_TX_STOP_FLUSH_CONT: called when TX aggregation is stopped
2851  *	but the driver hasn't called ieee80211_stop_tx_ba_cb_irqsafe() yet and
2852  *	now the connection is dropped and the station will be removed. Drivers
2853  *	should clean up and drop remaining packets when this is called.
2854  */
2855 enum ieee80211_ampdu_mlme_action {
2856 	IEEE80211_AMPDU_RX_START,
2857 	IEEE80211_AMPDU_RX_STOP,
2858 	IEEE80211_AMPDU_TX_START,
2859 	IEEE80211_AMPDU_TX_STOP_CONT,
2860 	IEEE80211_AMPDU_TX_STOP_FLUSH,
2861 	IEEE80211_AMPDU_TX_STOP_FLUSH_CONT,
2862 	IEEE80211_AMPDU_TX_OPERATIONAL,
2863 };
2864 
2865 /**
2866  * struct ieee80211_ampdu_params - AMPDU action parameters
2867  *
2868  * @action: the ampdu action, value from %ieee80211_ampdu_mlme_action.
2869  * @sta: peer of this AMPDU session
2870  * @tid: tid of the BA session
2871  * @ssn: start sequence number of the session. TX/RX_STOP can pass 0. When
2872  *	action is set to %IEEE80211_AMPDU_RX_START the driver passes back the
2873  *	actual ssn value used to start the session and writes the value here.
2874  * @buf_size: reorder buffer size  (number of subframes). Valid only when the
2875  *	action is set to %IEEE80211_AMPDU_RX_START or
2876  *	%IEEE80211_AMPDU_TX_OPERATIONAL
2877  * @amsdu: indicates the peer's ability to receive A-MSDU within A-MPDU.
2878  *	valid when the action is set to %IEEE80211_AMPDU_TX_OPERATIONAL
2879  * @timeout: BA session timeout. Valid only when the action is set to
2880  *	%IEEE80211_AMPDU_RX_START
2881  */
2882 struct ieee80211_ampdu_params {
2883 	enum ieee80211_ampdu_mlme_action action;
2884 	struct ieee80211_sta *sta;
2885 	u16 tid;
2886 	u16 ssn;
2887 	u8 buf_size;
2888 	bool amsdu;
2889 	u16 timeout;
2890 };
2891 
2892 /**
2893  * enum ieee80211_frame_release_type - frame release reason
2894  * @IEEE80211_FRAME_RELEASE_PSPOLL: frame released for PS-Poll
2895  * @IEEE80211_FRAME_RELEASE_UAPSD: frame(s) released due to
2896  *	frame received on trigger-enabled AC
2897  */
2898 enum ieee80211_frame_release_type {
2899 	IEEE80211_FRAME_RELEASE_PSPOLL,
2900 	IEEE80211_FRAME_RELEASE_UAPSD,
2901 };
2902 
2903 /**
2904  * enum ieee80211_rate_control_changed - flags to indicate what changed
2905  *
2906  * @IEEE80211_RC_BW_CHANGED: The bandwidth that can be used to transmit
2907  *	to this station changed. The actual bandwidth is in the station
2908  *	information -- for HT20/40 the IEEE80211_HT_CAP_SUP_WIDTH_20_40
2909  *	flag changes, for HT and VHT the bandwidth field changes.
2910  * @IEEE80211_RC_SMPS_CHANGED: The SMPS state of the station changed.
2911  * @IEEE80211_RC_SUPP_RATES_CHANGED: The supported rate set of this peer
2912  *	changed (in IBSS mode) due to discovering more information about
2913  *	the peer.
2914  * @IEEE80211_RC_NSS_CHANGED: N_SS (number of spatial streams) was changed
2915  *	by the peer
2916  */
2917 enum ieee80211_rate_control_changed {
2918 	IEEE80211_RC_BW_CHANGED		= BIT(0),
2919 	IEEE80211_RC_SMPS_CHANGED	= BIT(1),
2920 	IEEE80211_RC_SUPP_RATES_CHANGED	= BIT(2),
2921 	IEEE80211_RC_NSS_CHANGED	= BIT(3),
2922 };
2923 
2924 /**
2925  * enum ieee80211_roc_type - remain on channel type
2926  *
2927  * With the support for multi channel contexts and multi channel operations,
2928  * remain on channel operations might be limited/deferred/aborted by other
2929  * flows/operations which have higher priority (and vise versa).
2930  * Specifying the ROC type can be used by devices to prioritize the ROC
2931  * operations compared to other operations/flows.
2932  *
2933  * @IEEE80211_ROC_TYPE_NORMAL: There are no special requirements for this ROC.
2934  * @IEEE80211_ROC_TYPE_MGMT_TX: The remain on channel request is required
2935  *	for sending managment frames offchannel.
2936  */
2937 enum ieee80211_roc_type {
2938 	IEEE80211_ROC_TYPE_NORMAL = 0,
2939 	IEEE80211_ROC_TYPE_MGMT_TX,
2940 };
2941 
2942 /**
2943  * enum ieee80211_reconfig_complete_type - reconfig type
2944  *
2945  * This enum is used by the reconfig_complete() callback to indicate what
2946  * reconfiguration type was completed.
2947  *
2948  * @IEEE80211_RECONFIG_TYPE_RESTART: hw restart type
2949  *	(also due to resume() callback returning 1)
2950  * @IEEE80211_RECONFIG_TYPE_SUSPEND: suspend type (regardless
2951  *	of wowlan configuration)
2952  */
2953 enum ieee80211_reconfig_type {
2954 	IEEE80211_RECONFIG_TYPE_RESTART,
2955 	IEEE80211_RECONFIG_TYPE_SUSPEND,
2956 };
2957 
2958 /**
2959  * struct ieee80211_ops - callbacks from mac80211 to the driver
2960  *
2961  * This structure contains various callbacks that the driver may
2962  * handle or, in some cases, must handle, for example to configure
2963  * the hardware to a new channel or to transmit a frame.
2964  *
2965  * @tx: Handler that 802.11 module calls for each transmitted frame.
2966  *	skb contains the buffer starting from the IEEE 802.11 header.
2967  *	The low-level driver should send the frame out based on
2968  *	configuration in the TX control data. This handler should,
2969  *	preferably, never fail and stop queues appropriately.
2970  *	Must be atomic.
2971  *
2972  * @start: Called before the first netdevice attached to the hardware
2973  *	is enabled. This should turn on the hardware and must turn on
2974  *	frame reception (for possibly enabled monitor interfaces.)
2975  *	Returns negative error codes, these may be seen in userspace,
2976  *	or zero.
2977  *	When the device is started it should not have a MAC address
2978  *	to avoid acknowledging frames before a non-monitor device
2979  *	is added.
2980  *	Must be implemented and can sleep.
2981  *
2982  * @stop: Called after last netdevice attached to the hardware
2983  *	is disabled. This should turn off the hardware (at least
2984  *	it must turn off frame reception.)
2985  *	May be called right after add_interface if that rejects
2986  *	an interface. If you added any work onto the mac80211 workqueue
2987  *	you should ensure to cancel it on this callback.
2988  *	Must be implemented and can sleep.
2989  *
2990  * @suspend: Suspend the device; mac80211 itself will quiesce before and
2991  *	stop transmitting and doing any other configuration, and then
2992  *	ask the device to suspend. This is only invoked when WoWLAN is
2993  *	configured, otherwise the device is deconfigured completely and
2994  *	reconfigured at resume time.
2995  *	The driver may also impose special conditions under which it
2996  *	wants to use the "normal" suspend (deconfigure), say if it only
2997  *	supports WoWLAN when the device is associated. In this case, it
2998  *	must return 1 from this function.
2999  *
3000  * @resume: If WoWLAN was configured, this indicates that mac80211 is
3001  *	now resuming its operation, after this the device must be fully
3002  *	functional again. If this returns an error, the only way out is
3003  *	to also unregister the device. If it returns 1, then mac80211
3004  *	will also go through the regular complete restart on resume.
3005  *
3006  * @set_wakeup: Enable or disable wakeup when WoWLAN configuration is
3007  *	modified. The reason is that device_set_wakeup_enable() is
3008  *	supposed to be called when the configuration changes, not only
3009  *	in suspend().
3010  *
3011  * @add_interface: Called when a netdevice attached to the hardware is
3012  *	enabled. Because it is not called for monitor mode devices, @start
3013  *	and @stop must be implemented.
3014  *	The driver should perform any initialization it needs before
3015  *	the device can be enabled. The initial configuration for the
3016  *	interface is given in the conf parameter.
3017  *	The callback may refuse to add an interface by returning a
3018  *	negative error code (which will be seen in userspace.)
3019  *	Must be implemented and can sleep.
3020  *
3021  * @change_interface: Called when a netdevice changes type. This callback
3022  *	is optional, but only if it is supported can interface types be
3023  *	switched while the interface is UP. The callback may sleep.
3024  *	Note that while an interface is being switched, it will not be
3025  *	found by the interface iteration callbacks.
3026  *
3027  * @remove_interface: Notifies a driver that an interface is going down.
3028  *	The @stop callback is called after this if it is the last interface
3029  *	and no monitor interfaces are present.
3030  *	When all interfaces are removed, the MAC address in the hardware
3031  *	must be cleared so the device no longer acknowledges packets,
3032  *	the mac_addr member of the conf structure is, however, set to the
3033  *	MAC address of the device going away.
3034  *	Hence, this callback must be implemented. It can sleep.
3035  *
3036  * @config: Handler for configuration requests. IEEE 802.11 code calls this
3037  *	function to change hardware configuration, e.g., channel.
3038  *	This function should never fail but returns a negative error code
3039  *	if it does. The callback can sleep.
3040  *
3041  * @bss_info_changed: Handler for configuration requests related to BSS
3042  *	parameters that may vary during BSS's lifespan, and may affect low
3043  *	level driver (e.g. assoc/disassoc status, erp parameters).
3044  *	This function should not be used if no BSS has been set, unless
3045  *	for association indication. The @changed parameter indicates which
3046  *	of the bss parameters has changed when a call is made. The callback
3047  *	can sleep.
3048  *
3049  * @prepare_multicast: Prepare for multicast filter configuration.
3050  *	This callback is optional, and its return value is passed
3051  *	to configure_filter(). This callback must be atomic.
3052  *
3053  * @configure_filter: Configure the device's RX filter.
3054  *	See the section "Frame filtering" for more information.
3055  *	This callback must be implemented and can sleep.
3056  *
3057  * @config_iface_filter: Configure the interface's RX filter.
3058  *	This callback is optional and is used to configure which frames
3059  *	should be passed to mac80211. The filter_flags is the combination
3060  *	of FIF_* flags. The changed_flags is a bit mask that indicates
3061  *	which flags are changed.
3062  *	This callback can sleep.
3063  *
3064  * @set_tim: Set TIM bit. mac80211 calls this function when a TIM bit
3065  * 	must be set or cleared for a given STA. Must be atomic.
3066  *
3067  * @set_key: See the section "Hardware crypto acceleration"
3068  *	This callback is only called between add_interface and
3069  *	remove_interface calls, i.e. while the given virtual interface
3070  *	is enabled.
3071  *	Returns a negative error code if the key can't be added.
3072  *	The callback can sleep.
3073  *
3074  * @update_tkip_key: See the section "Hardware crypto acceleration"
3075  * 	This callback will be called in the context of Rx. Called for drivers
3076  * 	which set IEEE80211_KEY_FLAG_TKIP_REQ_RX_P1_KEY.
3077  *	The callback must be atomic.
3078  *
3079  * @set_rekey_data: If the device supports GTK rekeying, for example while the
3080  *	host is suspended, it can assign this callback to retrieve the data
3081  *	necessary to do GTK rekeying, this is the KEK, KCK and replay counter.
3082  *	After rekeying was done it should (for example during resume) notify
3083  *	userspace of the new replay counter using ieee80211_gtk_rekey_notify().
3084  *
3085  * @set_default_unicast_key: Set the default (unicast) key index, useful for
3086  *	WEP when the device sends data packets autonomously, e.g. for ARP
3087  *	offloading. The index can be 0-3, or -1 for unsetting it.
3088  *
3089  * @hw_scan: Ask the hardware to service the scan request, no need to start
3090  *	the scan state machine in stack. The scan must honour the channel
3091  *	configuration done by the regulatory agent in the wiphy's
3092  *	registered bands. The hardware (or the driver) needs to make sure
3093  *	that power save is disabled.
3094  *	The @req ie/ie_len members are rewritten by mac80211 to contain the
3095  *	entire IEs after the SSID, so that drivers need not look at these
3096  *	at all but just send them after the SSID -- mac80211 includes the
3097  *	(extended) supported rates and HT information (where applicable).
3098  *	When the scan finishes, ieee80211_scan_completed() must be called;
3099  *	note that it also must be called when the scan cannot finish due to
3100  *	any error unless this callback returned a negative error code.
3101  *	The callback can sleep.
3102  *
3103  * @cancel_hw_scan: Ask the low-level tp cancel the active hw scan.
3104  *	The driver should ask the hardware to cancel the scan (if possible),
3105  *	but the scan will be completed only after the driver will call
3106  *	ieee80211_scan_completed().
3107  *	This callback is needed for wowlan, to prevent enqueueing a new
3108  *	scan_work after the low-level driver was already suspended.
3109  *	The callback can sleep.
3110  *
3111  * @sched_scan_start: Ask the hardware to start scanning repeatedly at
3112  *	specific intervals.  The driver must call the
3113  *	ieee80211_sched_scan_results() function whenever it finds results.
3114  *	This process will continue until sched_scan_stop is called.
3115  *
3116  * @sched_scan_stop: Tell the hardware to stop an ongoing scheduled scan.
3117  *	In this case, ieee80211_sched_scan_stopped() must not be called.
3118  *
3119  * @sw_scan_start: Notifier function that is called just before a software scan
3120  *	is started. Can be NULL, if the driver doesn't need this notification.
3121  *	The mac_addr parameter allows supporting NL80211_SCAN_FLAG_RANDOM_ADDR,
3122  *	the driver may set the NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR flag if it
3123  *	can use this parameter. The callback can sleep.
3124  *
3125  * @sw_scan_complete: Notifier function that is called just after a
3126  *	software scan finished. Can be NULL, if the driver doesn't need
3127  *	this notification.
3128  *	The callback can sleep.
3129  *
3130  * @get_stats: Return low-level statistics.
3131  * 	Returns zero if statistics are available.
3132  *	The callback can sleep.
3133  *
3134  * @get_key_seq: If your device implements encryption in hardware and does
3135  *	IV/PN assignment then this callback should be provided to read the
3136  *	IV/PN for the given key from hardware.
3137  *	The callback must be atomic.
3138  *
3139  * @set_frag_threshold: Configuration of fragmentation threshold. Assign this
3140  *	if the device does fragmentation by itself. Note that to prevent the
3141  *	stack from doing fragmentation IEEE80211_HW_SUPPORTS_TX_FRAG
3142  *	should be set as well.
3143  *	The callback can sleep.
3144  *
3145  * @set_rts_threshold: Configuration of RTS threshold (if device needs it)
3146  *	The callback can sleep.
3147  *
3148  * @sta_add: Notifies low level driver about addition of an associated station,
3149  *	AP, IBSS/WDS/mesh peer etc. This callback can sleep.
3150  *
3151  * @sta_remove: Notifies low level driver about removal of an associated
3152  *	station, AP, IBSS/WDS/mesh peer etc. Note that after the callback
3153  *	returns it isn't safe to use the pointer, not even RCU protected;
3154  *	no RCU grace period is guaranteed between returning here and freeing
3155  *	the station. See @sta_pre_rcu_remove if needed.
3156  *	This callback can sleep.
3157  *
3158  * @sta_add_debugfs: Drivers can use this callback to add debugfs files
3159  *	when a station is added to mac80211's station list. This callback
3160  *	should be within a CONFIG_MAC80211_DEBUGFS conditional. This
3161  *	callback can sleep.
3162  *
3163  * @sta_notify: Notifies low level driver about power state transition of an
3164  *	associated station, AP,  IBSS/WDS/mesh peer etc. For a VIF operating
3165  *	in AP mode, this callback will not be called when the flag
3166  *	%IEEE80211_HW_AP_LINK_PS is set. Must be atomic.
3167  *
3168  * @sta_state: Notifies low level driver about state transition of a
3169  *	station (which can be the AP, a client, IBSS/WDS/mesh peer etc.)
3170  *	This callback is mutually exclusive with @sta_add/@sta_remove.
3171  *	It must not fail for down transitions but may fail for transitions
3172  *	up the list of states. Also note that after the callback returns it
3173  *	isn't safe to use the pointer, not even RCU protected - no RCU grace
3174  *	period is guaranteed between returning here and freeing the station.
3175  *	See @sta_pre_rcu_remove if needed.
3176  *	The callback can sleep.
3177  *
3178  * @sta_pre_rcu_remove: Notify driver about station removal before RCU
3179  *	synchronisation. This is useful if a driver needs to have station
3180  *	pointers protected using RCU, it can then use this call to clear
3181  *	the pointers instead of waiting for an RCU grace period to elapse
3182  *	in @sta_state.
3183  *	The callback can sleep.
3184  *
3185  * @sta_rc_update: Notifies the driver of changes to the bitrates that can be
3186  *	used to transmit to the station. The changes are advertised with bits
3187  *	from &enum ieee80211_rate_control_changed and the values are reflected
3188  *	in the station data. This callback should only be used when the driver
3189  *	uses hardware rate control (%IEEE80211_HW_HAS_RATE_CONTROL) since
3190  *	otherwise the rate control algorithm is notified directly.
3191  *	Must be atomic.
3192  * @sta_rate_tbl_update: Notifies the driver that the rate table changed. This
3193  *	is only used if the configured rate control algorithm actually uses
3194  *	the new rate table API, and is therefore optional. Must be atomic.
3195  *
3196  * @sta_statistics: Get statistics for this station. For example with beacon
3197  *	filtering, the statistics kept by mac80211 might not be accurate, so
3198  *	let the driver pre-fill the statistics. The driver can fill most of
3199  *	the values (indicating which by setting the filled bitmap), but not
3200  *	all of them make sense - see the source for which ones are possible.
3201  *	Statistics that the driver doesn't fill will be filled by mac80211.
3202  *	The callback can sleep.
3203  *
3204  * @conf_tx: Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
3205  *	bursting) for a hardware TX queue.
3206  *	Returns a negative error code on failure.
3207  *	The callback can sleep.
3208  *
3209  * @get_tsf: Get the current TSF timer value from firmware/hardware. Currently,
3210  *	this is only used for IBSS mode BSSID merging and debugging. Is not a
3211  *	required function.
3212  *	The callback can sleep.
3213  *
3214  * @set_tsf: Set the TSF timer to the specified value in the firmware/hardware.
3215  *	Currently, this is only used for IBSS mode debugging. Is not a
3216  *	required function.
3217  *	The callback can sleep.
3218  *
3219  * @offset_tsf: Offset the TSF timer by the specified value in the
3220  *	firmware/hardware.  Preferred to set_tsf as it avoids delay between
3221  *	calling set_tsf() and hardware getting programmed, which will show up
3222  *	as TSF delay. Is not a required function.
3223  *	The callback can sleep.
3224  *
3225  * @reset_tsf: Reset the TSF timer and allow firmware/hardware to synchronize
3226  *	with other STAs in the IBSS. This is only used in IBSS mode. This
3227  *	function is optional if the firmware/hardware takes full care of
3228  *	TSF synchronization.
3229  *	The callback can sleep.
3230  *
3231  * @tx_last_beacon: Determine whether the last IBSS beacon was sent by us.
3232  *	This is needed only for IBSS mode and the result of this function is
3233  *	used to determine whether to reply to Probe Requests.
3234  *	Returns non-zero if this device sent the last beacon.
3235  *	The callback can sleep.
3236  *
3237  * @get_survey: Return per-channel survey information
3238  *
3239  * @rfkill_poll: Poll rfkill hardware state. If you need this, you also
3240  *	need to set wiphy->rfkill_poll to %true before registration,
3241  *	and need to call wiphy_rfkill_set_hw_state() in the callback.
3242  *	The callback can sleep.
3243  *
3244  * @set_coverage_class: Set slot time for given coverage class as specified
3245  *	in IEEE 802.11-2007 section 17.3.8.6 and modify ACK timeout
3246  *	accordingly; coverage class equals to -1 to enable ACK timeout
3247  *	estimation algorithm (dynack). To disable dynack set valid value for
3248  *	coverage class. This callback is not required and may sleep.
3249  *
3250  * @testmode_cmd: Implement a cfg80211 test mode command. The passed @vif may
3251  *	be %NULL. The callback can sleep.
3252  * @testmode_dump: Implement a cfg80211 test mode dump. The callback can sleep.
3253  *
3254  * @flush: Flush all pending frames from the hardware queue, making sure
3255  *	that the hardware queues are empty. The @queues parameter is a bitmap
3256  *	of queues to flush, which is useful if different virtual interfaces
3257  *	use different hardware queues; it may also indicate all queues.
3258  *	If the parameter @drop is set to %true, pending frames may be dropped.
3259  *	Note that vif can be NULL.
3260  *	The callback can sleep.
3261  *
3262  * @channel_switch: Drivers that need (or want) to offload the channel
3263  *	switch operation for CSAs received from the AP may implement this
3264  *	callback. They must then call ieee80211_chswitch_done() to indicate
3265  *	completion of the channel switch.
3266  *
3267  * @set_antenna: Set antenna configuration (tx_ant, rx_ant) on the device.
3268  *	Parameters are bitmaps of allowed antennas to use for TX/RX. Drivers may
3269  *	reject TX/RX mask combinations they cannot support by returning -EINVAL
3270  *	(also see nl80211.h @NL80211_ATTR_WIPHY_ANTENNA_TX).
3271  *
3272  * @get_antenna: Get current antenna configuration from device (tx_ant, rx_ant).
3273  *
3274  * @remain_on_channel: Starts an off-channel period on the given channel, must
3275  *	call back to ieee80211_ready_on_channel() when on that channel. Note
3276  *	that normal channel traffic is not stopped as this is intended for hw
3277  *	offload. Frames to transmit on the off-channel channel are transmitted
3278  *	normally except for the %IEEE80211_TX_CTL_TX_OFFCHAN flag. When the
3279  *	duration (which will always be non-zero) expires, the driver must call
3280  *	ieee80211_remain_on_channel_expired().
3281  *	Note that this callback may be called while the device is in IDLE and
3282  *	must be accepted in this case.
3283  *	This callback may sleep.
3284  * @cancel_remain_on_channel: Requests that an ongoing off-channel period is
3285  *	aborted before it expires. This callback may sleep.
3286  *
3287  * @set_ringparam: Set tx and rx ring sizes.
3288  *
3289  * @get_ringparam: Get tx and rx ring current and maximum sizes.
3290  *
3291  * @tx_frames_pending: Check if there is any pending frame in the hardware
3292  *	queues before entering power save.
3293  *
3294  * @set_bitrate_mask: Set a mask of rates to be used for rate control selection
3295  *	when transmitting a frame. Currently only legacy rates are handled.
3296  *	The callback can sleep.
3297  * @event_callback: Notify driver about any event in mac80211. See
3298  *	&enum ieee80211_event_type for the different types.
3299  *	The callback must be atomic.
3300  *
3301  * @release_buffered_frames: Release buffered frames according to the given
3302  *	parameters. In the case where the driver buffers some frames for
3303  *	sleeping stations mac80211 will use this callback to tell the driver
3304  *	to release some frames, either for PS-poll or uAPSD.
3305  *	Note that if the @more_data parameter is %false the driver must check
3306  *	if there are more frames on the given TIDs, and if there are more than
3307  *	the frames being released then it must still set the more-data bit in
3308  *	the frame. If the @more_data parameter is %true, then of course the
3309  *	more-data bit must always be set.
3310  *	The @tids parameter tells the driver which TIDs to release frames
3311  *	from, for PS-poll it will always have only a single bit set.
3312  *	In the case this is used for a PS-poll initiated release, the
3313  *	@num_frames parameter will always be 1 so code can be shared. In
3314  *	this case the driver must also set %IEEE80211_TX_STATUS_EOSP flag
3315  *	on the TX status (and must report TX status) so that the PS-poll
3316  *	period is properly ended. This is used to avoid sending multiple
3317  *	responses for a retried PS-poll frame.
3318  *	In the case this is used for uAPSD, the @num_frames parameter may be
3319  *	bigger than one, but the driver may send fewer frames (it must send
3320  *	at least one, however). In this case it is also responsible for
3321  *	setting the EOSP flag in the QoS header of the frames. Also, when the
3322  *	service period ends, the driver must set %IEEE80211_TX_STATUS_EOSP
3323  *	on the last frame in the SP. Alternatively, it may call the function
3324  *	ieee80211_sta_eosp() to inform mac80211 of the end of the SP.
3325  *	This callback must be atomic.
3326  * @allow_buffered_frames: Prepare device to allow the given number of frames
3327  *	to go out to the given station. The frames will be sent by mac80211
3328  *	via the usual TX path after this call. The TX information for frames
3329  *	released will also have the %IEEE80211_TX_CTL_NO_PS_BUFFER flag set
3330  *	and the last one will also have %IEEE80211_TX_STATUS_EOSP set. In case
3331  *	frames from multiple TIDs are released and the driver might reorder
3332  *	them between the TIDs, it must set the %IEEE80211_TX_STATUS_EOSP flag
3333  *	on the last frame and clear it on all others and also handle the EOSP
3334  *	bit in the QoS header correctly. Alternatively, it can also call the
3335  *	ieee80211_sta_eosp() function.
3336  *	The @tids parameter is a bitmap and tells the driver which TIDs the
3337  *	frames will be on; it will at most have two bits set.
3338  *	This callback must be atomic.
3339  *
3340  * @get_et_sset_count:  Ethtool API to get string-set count.
3341  *
3342  * @get_et_stats:  Ethtool API to get a set of u64 stats.
3343  *
3344  * @get_et_strings:  Ethtool API to get a set of strings to describe stats
3345  *	and perhaps other supported types of ethtool data-sets.
3346  *
3347  * @mgd_prepare_tx: Prepare for transmitting a management frame for association
3348  *	before associated. In multi-channel scenarios, a virtual interface is
3349  *	bound to a channel before it is associated, but as it isn't associated
3350  *	yet it need not necessarily be given airtime, in particular since any
3351  *	transmission to a P2P GO needs to be synchronized against the GO's
3352  *	powersave state. mac80211 will call this function before transmitting a
3353  *	management frame prior to having successfully associated to allow the
3354  *	driver to give it channel time for the transmission, to get a response
3355  *	and to be able to synchronize with the GO.
3356  *	The callback will be called before each transmission and upon return
3357  *	mac80211 will transmit the frame right away.
3358  *	The callback is optional and can (should!) sleep.
3359  *
3360  * @mgd_protect_tdls_discover: Protect a TDLS discovery session. After sending
3361  *	a TDLS discovery-request, we expect a reply to arrive on the AP's
3362  *	channel. We must stay on the channel (no PSM, scan, etc.), since a TDLS
3363  *	setup-response is a direct packet not buffered by the AP.
3364  *	mac80211 will call this function just before the transmission of a TDLS
3365  *	discovery-request. The recommended period of protection is at least
3366  *	2 * (DTIM period).
3367  *	The callback is optional and can sleep.
3368  *
3369  * @add_chanctx: Notifies device driver about new channel context creation.
3370  *	This callback may sleep.
3371  * @remove_chanctx: Notifies device driver about channel context destruction.
3372  *	This callback may sleep.
3373  * @change_chanctx: Notifies device driver about channel context changes that
3374  *	may happen when combining different virtual interfaces on the same
3375  *	channel context with different settings
3376  *	This callback may sleep.
3377  * @assign_vif_chanctx: Notifies device driver about channel context being bound
3378  *	to vif. Possible use is for hw queue remapping.
3379  *	This callback may sleep.
3380  * @unassign_vif_chanctx: Notifies device driver about channel context being
3381  *	unbound from vif.
3382  *	This callback may sleep.
3383  * @switch_vif_chanctx: switch a number of vifs from one chanctx to
3384  *	another, as specified in the list of
3385  *	@ieee80211_vif_chanctx_switch passed to the driver, according
3386  *	to the mode defined in &ieee80211_chanctx_switch_mode.
3387  *	This callback may sleep.
3388  *
3389  * @start_ap: Start operation on the AP interface, this is called after all the
3390  *	information in bss_conf is set and beacon can be retrieved. A channel
3391  *	context is bound before this is called. Note that if the driver uses
3392  *	software scan or ROC, this (and @stop_ap) isn't called when the AP is
3393  *	just "paused" for scanning/ROC, which is indicated by the beacon being
3394  *	disabled/enabled via @bss_info_changed.
3395  * @stop_ap: Stop operation on the AP interface.
3396  *
3397  * @reconfig_complete: Called after a call to ieee80211_restart_hw() and
3398  *	during resume, when the reconfiguration has completed.
3399  *	This can help the driver implement the reconfiguration step (and
3400  *	indicate mac80211 is ready to receive frames).
3401  *	This callback may sleep.
3402  *
3403  * @ipv6_addr_change: IPv6 address assignment on the given interface changed.
3404  *	Currently, this is only called for managed or P2P client interfaces.
3405  *	This callback is optional; it must not sleep.
3406  *
3407  * @channel_switch_beacon: Starts a channel switch to a new channel.
3408  *	Beacons are modified to include CSA or ECSA IEs before calling this
3409  *	function. The corresponding count fields in these IEs must be
3410  *	decremented, and when they reach 1 the driver must call
3411  *	ieee80211_csa_finish(). Drivers which use ieee80211_beacon_get()
3412  *	get the csa counter decremented by mac80211, but must check if it is
3413  *	1 using ieee80211_csa_is_complete() after the beacon has been
3414  *	transmitted and then call ieee80211_csa_finish().
3415  *	If the CSA count starts as zero or 1, this function will not be called,
3416  *	since there won't be any time to beacon before the switch anyway.
3417  * @pre_channel_switch: This is an optional callback that is called
3418  *	before a channel switch procedure is started (ie. when a STA
3419  *	gets a CSA or a userspace initiated channel-switch), allowing
3420  *	the driver to prepare for the channel switch.
3421  * @post_channel_switch: This is an optional callback that is called
3422  *	after a channel switch procedure is completed, allowing the
3423  *	driver to go back to a normal configuration.
3424  *
3425  * @join_ibss: Join an IBSS (on an IBSS interface); this is called after all
3426  *	information in bss_conf is set up and the beacon can be retrieved. A
3427  *	channel context is bound before this is called.
3428  * @leave_ibss: Leave the IBSS again.
3429  *
3430  * @get_expected_throughput: extract the expected throughput towards the
3431  *	specified station. The returned value is expressed in Kbps. It returns 0
3432  *	if the RC algorithm does not have proper data to provide.
3433  *
3434  * @get_txpower: get current maximum tx power (in dBm) based on configuration
3435  *	and hardware limits.
3436  *
3437  * @tdls_channel_switch: Start channel-switching with a TDLS peer. The driver
3438  *	is responsible for continually initiating channel-switching operations
3439  *	and returning to the base channel for communication with the AP. The
3440  *	driver receives a channel-switch request template and the location of
3441  *	the switch-timing IE within the template as part of the invocation.
3442  *	The template is valid only within the call, and the driver can
3443  *	optionally copy the skb for further re-use.
3444  * @tdls_cancel_channel_switch: Stop channel-switching with a TDLS peer. Both
3445  *	peers must be on the base channel when the call completes.
3446  * @tdls_recv_channel_switch: a TDLS channel-switch related frame (request or
3447  *	response) has been received from a remote peer. The driver gets
3448  *	parameters parsed from the incoming frame and may use them to continue
3449  *	an ongoing channel-switch operation. In addition, a channel-switch
3450  *	response template is provided, together with the location of the
3451  *	switch-timing IE within the template. The skb can only be used within
3452  *	the function call.
3453  *
3454  * @wake_tx_queue: Called when new packets have been added to the queue.
3455  * @sync_rx_queues: Process all pending frames in RSS queues. This is a
3456  *	synchronization which is needed in case driver has in its RSS queues
3457  *	pending frames that were received prior to the control path action
3458  *	currently taken (e.g. disassociation) but are not processed yet.
3459  *
3460  * @start_nan: join an existing NAN cluster, or create a new one.
3461  * @stop_nan: leave the NAN cluster.
3462  * @nan_change_conf: change NAN configuration. The data in cfg80211_nan_conf
3463  *	contains full new configuration and changes specify which parameters
3464  *	are changed with respect to the last NAN config.
3465  *	The driver gets both full configuration and the changed parameters since
3466  *	some devices may need the full configuration while others need only the
3467  *	changed parameters.
3468  * @add_nan_func: Add a NAN function. Returns 0 on success. The data in
3469  *	cfg80211_nan_func must not be referenced outside the scope of
3470  *	this call.
3471  * @del_nan_func: Remove a NAN function. The driver must call
3472  *	ieee80211_nan_func_terminated() with
3473  *	NL80211_NAN_FUNC_TERM_REASON_USER_REQUEST reason code upon removal.
3474  */
3475 struct ieee80211_ops {
3476 	void (*tx)(struct ieee80211_hw *hw,
3477 		   struct ieee80211_tx_control *control,
3478 		   struct sk_buff *skb);
3479 	int (*start)(struct ieee80211_hw *hw);
3480 	void (*stop)(struct ieee80211_hw *hw);
3481 #ifdef CONFIG_PM
3482 	int (*suspend)(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan);
3483 	int (*resume)(struct ieee80211_hw *hw);
3484 	void (*set_wakeup)(struct ieee80211_hw *hw, bool enabled);
3485 #endif
3486 	int (*add_interface)(struct ieee80211_hw *hw,
3487 			     struct ieee80211_vif *vif);
3488 	int (*change_interface)(struct ieee80211_hw *hw,
3489 				struct ieee80211_vif *vif,
3490 				enum nl80211_iftype new_type, bool p2p);
3491 	void (*remove_interface)(struct ieee80211_hw *hw,
3492 				 struct ieee80211_vif *vif);
3493 	int (*config)(struct ieee80211_hw *hw, u32 changed);
3494 	void (*bss_info_changed)(struct ieee80211_hw *hw,
3495 				 struct ieee80211_vif *vif,
3496 				 struct ieee80211_bss_conf *info,
3497 				 u32 changed);
3498 
3499 	int (*start_ap)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
3500 	void (*stop_ap)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
3501 
3502 	u64 (*prepare_multicast)(struct ieee80211_hw *hw,
3503 				 struct netdev_hw_addr_list *mc_list);
3504 	void (*configure_filter)(struct ieee80211_hw *hw,
3505 				 unsigned int changed_flags,
3506 				 unsigned int *total_flags,
3507 				 u64 multicast);
3508 	void (*config_iface_filter)(struct ieee80211_hw *hw,
3509 				    struct ieee80211_vif *vif,
3510 				    unsigned int filter_flags,
3511 				    unsigned int changed_flags);
3512 	int (*set_tim)(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
3513 		       bool set);
3514 	int (*set_key)(struct ieee80211_hw *hw, enum set_key_cmd cmd,
3515 		       struct ieee80211_vif *vif, struct ieee80211_sta *sta,
3516 		       struct ieee80211_key_conf *key);
3517 	void (*update_tkip_key)(struct ieee80211_hw *hw,
3518 				struct ieee80211_vif *vif,
3519 				struct ieee80211_key_conf *conf,
3520 				struct ieee80211_sta *sta,
3521 				u32 iv32, u16 *phase1key);
3522 	void (*set_rekey_data)(struct ieee80211_hw *hw,
3523 			       struct ieee80211_vif *vif,
3524 			       struct cfg80211_gtk_rekey_data *data);
3525 	void (*set_default_unicast_key)(struct ieee80211_hw *hw,
3526 					struct ieee80211_vif *vif, int idx);
3527 	int (*hw_scan)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3528 		       struct ieee80211_scan_request *req);
3529 	void (*cancel_hw_scan)(struct ieee80211_hw *hw,
3530 			       struct ieee80211_vif *vif);
3531 	int (*sched_scan_start)(struct ieee80211_hw *hw,
3532 				struct ieee80211_vif *vif,
3533 				struct cfg80211_sched_scan_request *req,
3534 				struct ieee80211_scan_ies *ies);
3535 	int (*sched_scan_stop)(struct ieee80211_hw *hw,
3536 			       struct ieee80211_vif *vif);
3537 	void (*sw_scan_start)(struct ieee80211_hw *hw,
3538 			      struct ieee80211_vif *vif,
3539 			      const u8 *mac_addr);
3540 	void (*sw_scan_complete)(struct ieee80211_hw *hw,
3541 				 struct ieee80211_vif *vif);
3542 	int (*get_stats)(struct ieee80211_hw *hw,
3543 			 struct ieee80211_low_level_stats *stats);
3544 	void (*get_key_seq)(struct ieee80211_hw *hw,
3545 			    struct ieee80211_key_conf *key,
3546 			    struct ieee80211_key_seq *seq);
3547 	int (*set_frag_threshold)(struct ieee80211_hw *hw, u32 value);
3548 	int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value);
3549 	int (*sta_add)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3550 		       struct ieee80211_sta *sta);
3551 	int (*sta_remove)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3552 			  struct ieee80211_sta *sta);
3553 #ifdef CONFIG_MAC80211_DEBUGFS
3554 	void (*sta_add_debugfs)(struct ieee80211_hw *hw,
3555 				struct ieee80211_vif *vif,
3556 				struct ieee80211_sta *sta,
3557 				struct dentry *dir);
3558 #endif
3559 	void (*sta_notify)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3560 			enum sta_notify_cmd, struct ieee80211_sta *sta);
3561 	int (*sta_state)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3562 			 struct ieee80211_sta *sta,
3563 			 enum ieee80211_sta_state old_state,
3564 			 enum ieee80211_sta_state new_state);
3565 	void (*sta_pre_rcu_remove)(struct ieee80211_hw *hw,
3566 				   struct ieee80211_vif *vif,
3567 				   struct ieee80211_sta *sta);
3568 	void (*sta_rc_update)(struct ieee80211_hw *hw,
3569 			      struct ieee80211_vif *vif,
3570 			      struct ieee80211_sta *sta,
3571 			      u32 changed);
3572 	void (*sta_rate_tbl_update)(struct ieee80211_hw *hw,
3573 				    struct ieee80211_vif *vif,
3574 				    struct ieee80211_sta *sta);
3575 	void (*sta_statistics)(struct ieee80211_hw *hw,
3576 			       struct ieee80211_vif *vif,
3577 			       struct ieee80211_sta *sta,
3578 			       struct station_info *sinfo);
3579 	int (*conf_tx)(struct ieee80211_hw *hw,
3580 		       struct ieee80211_vif *vif, u16 ac,
3581 		       const struct ieee80211_tx_queue_params *params);
3582 	u64 (*get_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
3583 	void (*set_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3584 			u64 tsf);
3585 	void (*offset_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3586 			   s64 offset);
3587 	void (*reset_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
3588 	int (*tx_last_beacon)(struct ieee80211_hw *hw);
3589 
3590 	/**
3591 	 * @ampdu_action:
3592 	 * Perform a certain A-MPDU action.
3593 	 * The RA/TID combination determines the destination and TID we want
3594 	 * the ampdu action to be performed for. The action is defined through
3595 	 * ieee80211_ampdu_mlme_action.
3596 	 * When the action is set to %IEEE80211_AMPDU_TX_OPERATIONAL the driver
3597 	 * may neither send aggregates containing more subframes than @buf_size
3598 	 * nor send aggregates in a way that lost frames would exceed the
3599 	 * buffer size. If just limiting the aggregate size, this would be
3600 	 * possible with a buf_size of 8:
3601 	 *
3602 	 * - ``TX: 1.....7``
3603 	 * - ``RX:  2....7`` (lost frame #1)
3604 	 * - ``TX:        8..1...``
3605 	 *
3606 	 * which is invalid since #1 was now re-transmitted well past the
3607 	 * buffer size of 8. Correct ways to retransmit #1 would be:
3608 	 *
3609 	 * - ``TX:        1   or``
3610 	 * - ``TX:        18  or``
3611 	 * - ``TX:        81``
3612 	 *
3613 	 * Even ``189`` would be wrong since 1 could be lost again.
3614 	 *
3615 	 * Returns a negative error code on failure.
3616 	 * The callback can sleep.
3617 	 */
3618 	int (*ampdu_action)(struct ieee80211_hw *hw,
3619 			    struct ieee80211_vif *vif,
3620 			    struct ieee80211_ampdu_params *params);
3621 	int (*get_survey)(struct ieee80211_hw *hw, int idx,
3622 		struct survey_info *survey);
3623 	void (*rfkill_poll)(struct ieee80211_hw *hw);
3624 	void (*set_coverage_class)(struct ieee80211_hw *hw, s16 coverage_class);
3625 #ifdef CONFIG_NL80211_TESTMODE
3626 	int (*testmode_cmd)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3627 			    void *data, int len);
3628 	int (*testmode_dump)(struct ieee80211_hw *hw, struct sk_buff *skb,
3629 			     struct netlink_callback *cb,
3630 			     void *data, int len);
3631 #endif
3632 	void (*flush)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3633 		      u32 queues, bool drop);
3634 	void (*channel_switch)(struct ieee80211_hw *hw,
3635 			       struct ieee80211_vif *vif,
3636 			       struct ieee80211_channel_switch *ch_switch);
3637 	int (*set_antenna)(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant);
3638 	int (*get_antenna)(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant);
3639 
3640 	int (*remain_on_channel)(struct ieee80211_hw *hw,
3641 				 struct ieee80211_vif *vif,
3642 				 struct ieee80211_channel *chan,
3643 				 int duration,
3644 				 enum ieee80211_roc_type type);
3645 	int (*cancel_remain_on_channel)(struct ieee80211_hw *hw);
3646 	int (*set_ringparam)(struct ieee80211_hw *hw, u32 tx, u32 rx);
3647 	void (*get_ringparam)(struct ieee80211_hw *hw,
3648 			      u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max);
3649 	bool (*tx_frames_pending)(struct ieee80211_hw *hw);
3650 	int (*set_bitrate_mask)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3651 				const struct cfg80211_bitrate_mask *mask);
3652 	void (*event_callback)(struct ieee80211_hw *hw,
3653 			       struct ieee80211_vif *vif,
3654 			       const struct ieee80211_event *event);
3655 
3656 	void (*allow_buffered_frames)(struct ieee80211_hw *hw,
3657 				      struct ieee80211_sta *sta,
3658 				      u16 tids, int num_frames,
3659 				      enum ieee80211_frame_release_type reason,
3660 				      bool more_data);
3661 	void (*release_buffered_frames)(struct ieee80211_hw *hw,
3662 					struct ieee80211_sta *sta,
3663 					u16 tids, int num_frames,
3664 					enum ieee80211_frame_release_type reason,
3665 					bool more_data);
3666 
3667 	int	(*get_et_sset_count)(struct ieee80211_hw *hw,
3668 				     struct ieee80211_vif *vif, int sset);
3669 	void	(*get_et_stats)(struct ieee80211_hw *hw,
3670 				struct ieee80211_vif *vif,
3671 				struct ethtool_stats *stats, u64 *data);
3672 	void	(*get_et_strings)(struct ieee80211_hw *hw,
3673 				  struct ieee80211_vif *vif,
3674 				  u32 sset, u8 *data);
3675 
3676 	void	(*mgd_prepare_tx)(struct ieee80211_hw *hw,
3677 				  struct ieee80211_vif *vif);
3678 
3679 	void	(*mgd_protect_tdls_discover)(struct ieee80211_hw *hw,
3680 					     struct ieee80211_vif *vif);
3681 
3682 	int (*add_chanctx)(struct ieee80211_hw *hw,
3683 			   struct ieee80211_chanctx_conf *ctx);
3684 	void (*remove_chanctx)(struct ieee80211_hw *hw,
3685 			       struct ieee80211_chanctx_conf *ctx);
3686 	void (*change_chanctx)(struct ieee80211_hw *hw,
3687 			       struct ieee80211_chanctx_conf *ctx,
3688 			       u32 changed);
3689 	int (*assign_vif_chanctx)(struct ieee80211_hw *hw,
3690 				  struct ieee80211_vif *vif,
3691 				  struct ieee80211_chanctx_conf *ctx);
3692 	void (*unassign_vif_chanctx)(struct ieee80211_hw *hw,
3693 				     struct ieee80211_vif *vif,
3694 				     struct ieee80211_chanctx_conf *ctx);
3695 	int (*switch_vif_chanctx)(struct ieee80211_hw *hw,
3696 				  struct ieee80211_vif_chanctx_switch *vifs,
3697 				  int n_vifs,
3698 				  enum ieee80211_chanctx_switch_mode mode);
3699 
3700 	void (*reconfig_complete)(struct ieee80211_hw *hw,
3701 				  enum ieee80211_reconfig_type reconfig_type);
3702 
3703 #if IS_ENABLED(CONFIG_IPV6)
3704 	void (*ipv6_addr_change)(struct ieee80211_hw *hw,
3705 				 struct ieee80211_vif *vif,
3706 				 struct inet6_dev *idev);
3707 #endif
3708 	void (*channel_switch_beacon)(struct ieee80211_hw *hw,
3709 				      struct ieee80211_vif *vif,
3710 				      struct cfg80211_chan_def *chandef);
3711 	int (*pre_channel_switch)(struct ieee80211_hw *hw,
3712 				  struct ieee80211_vif *vif,
3713 				  struct ieee80211_channel_switch *ch_switch);
3714 
3715 	int (*post_channel_switch)(struct ieee80211_hw *hw,
3716 				   struct ieee80211_vif *vif);
3717 
3718 	int (*join_ibss)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
3719 	void (*leave_ibss)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
3720 	u32 (*get_expected_throughput)(struct ieee80211_hw *hw,
3721 				       struct ieee80211_sta *sta);
3722 	int (*get_txpower)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3723 			   int *dbm);
3724 
3725 	int (*tdls_channel_switch)(struct ieee80211_hw *hw,
3726 				   struct ieee80211_vif *vif,
3727 				   struct ieee80211_sta *sta, u8 oper_class,
3728 				   struct cfg80211_chan_def *chandef,
3729 				   struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie);
3730 	void (*tdls_cancel_channel_switch)(struct ieee80211_hw *hw,
3731 					   struct ieee80211_vif *vif,
3732 					   struct ieee80211_sta *sta);
3733 	void (*tdls_recv_channel_switch)(struct ieee80211_hw *hw,
3734 					 struct ieee80211_vif *vif,
3735 					 struct ieee80211_tdls_ch_sw_params *params);
3736 
3737 	void (*wake_tx_queue)(struct ieee80211_hw *hw,
3738 			      struct ieee80211_txq *txq);
3739 	void (*sync_rx_queues)(struct ieee80211_hw *hw);
3740 
3741 	int (*start_nan)(struct ieee80211_hw *hw,
3742 			 struct ieee80211_vif *vif,
3743 			 struct cfg80211_nan_conf *conf);
3744 	int (*stop_nan)(struct ieee80211_hw *hw,
3745 			struct ieee80211_vif *vif);
3746 	int (*nan_change_conf)(struct ieee80211_hw *hw,
3747 			       struct ieee80211_vif *vif,
3748 			       struct cfg80211_nan_conf *conf, u32 changes);
3749 	int (*add_nan_func)(struct ieee80211_hw *hw,
3750 			    struct ieee80211_vif *vif,
3751 			    const struct cfg80211_nan_func *nan_func);
3752 	void (*del_nan_func)(struct ieee80211_hw *hw,
3753 			    struct ieee80211_vif *vif,
3754 			    u8 instance_id);
3755 };
3756 
3757 /**
3758  * ieee80211_alloc_hw_nm - Allocate a new hardware device
3759  *
3760  * This must be called once for each hardware device. The returned pointer
3761  * must be used to refer to this device when calling other functions.
3762  * mac80211 allocates a private data area for the driver pointed to by
3763  * @priv in &struct ieee80211_hw, the size of this area is given as
3764  * @priv_data_len.
3765  *
3766  * @priv_data_len: length of private data
3767  * @ops: callbacks for this device
3768  * @requested_name: Requested name for this device.
3769  *	NULL is valid value, and means use the default naming (phy%d)
3770  *
3771  * Return: A pointer to the new hardware device, or %NULL on error.
3772  */
3773 struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
3774 					   const struct ieee80211_ops *ops,
3775 					   const char *requested_name);
3776 
3777 /**
3778  * ieee80211_alloc_hw - Allocate a new hardware device
3779  *
3780  * This must be called once for each hardware device. The returned pointer
3781  * must be used to refer to this device when calling other functions.
3782  * mac80211 allocates a private data area for the driver pointed to by
3783  * @priv in &struct ieee80211_hw, the size of this area is given as
3784  * @priv_data_len.
3785  *
3786  * @priv_data_len: length of private data
3787  * @ops: callbacks for this device
3788  *
3789  * Return: A pointer to the new hardware device, or %NULL on error.
3790  */
3791 static inline
3792 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
3793 					const struct ieee80211_ops *ops)
3794 {
3795 	return ieee80211_alloc_hw_nm(priv_data_len, ops, NULL);
3796 }
3797 
3798 /**
3799  * ieee80211_register_hw - Register hardware device
3800  *
3801  * You must call this function before any other functions in
3802  * mac80211. Note that before a hardware can be registered, you
3803  * need to fill the contained wiphy's information.
3804  *
3805  * @hw: the device to register as returned by ieee80211_alloc_hw()
3806  *
3807  * Return: 0 on success. An error code otherwise.
3808  */
3809 int ieee80211_register_hw(struct ieee80211_hw *hw);
3810 
3811 /**
3812  * struct ieee80211_tpt_blink - throughput blink description
3813  * @throughput: throughput in Kbit/sec
3814  * @blink_time: blink time in milliseconds
3815  *	(full cycle, ie. one off + one on period)
3816  */
3817 struct ieee80211_tpt_blink {
3818 	int throughput;
3819 	int blink_time;
3820 };
3821 
3822 /**
3823  * enum ieee80211_tpt_led_trigger_flags - throughput trigger flags
3824  * @IEEE80211_TPT_LEDTRIG_FL_RADIO: enable blinking with radio
3825  * @IEEE80211_TPT_LEDTRIG_FL_WORK: enable blinking when working
3826  * @IEEE80211_TPT_LEDTRIG_FL_CONNECTED: enable blinking when at least one
3827  *	interface is connected in some way, including being an AP
3828  */
3829 enum ieee80211_tpt_led_trigger_flags {
3830 	IEEE80211_TPT_LEDTRIG_FL_RADIO		= BIT(0),
3831 	IEEE80211_TPT_LEDTRIG_FL_WORK		= BIT(1),
3832 	IEEE80211_TPT_LEDTRIG_FL_CONNECTED	= BIT(2),
3833 };
3834 
3835 #ifdef CONFIG_MAC80211_LEDS
3836 const char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw);
3837 const char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw);
3838 const char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw);
3839 const char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw);
3840 const char *
3841 __ieee80211_create_tpt_led_trigger(struct ieee80211_hw *hw,
3842 				   unsigned int flags,
3843 				   const struct ieee80211_tpt_blink *blink_table,
3844 				   unsigned int blink_table_len);
3845 #endif
3846 /**
3847  * ieee80211_get_tx_led_name - get name of TX LED
3848  *
3849  * mac80211 creates a transmit LED trigger for each wireless hardware
3850  * that can be used to drive LEDs if your driver registers a LED device.
3851  * This function returns the name (or %NULL if not configured for LEDs)
3852  * of the trigger so you can automatically link the LED device.
3853  *
3854  * @hw: the hardware to get the LED trigger name for
3855  *
3856  * Return: The name of the LED trigger. %NULL if not configured for LEDs.
3857  */
3858 static inline const char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
3859 {
3860 #ifdef CONFIG_MAC80211_LEDS
3861 	return __ieee80211_get_tx_led_name(hw);
3862 #else
3863 	return NULL;
3864 #endif
3865 }
3866 
3867 /**
3868  * ieee80211_get_rx_led_name - get name of RX LED
3869  *
3870  * mac80211 creates a receive LED trigger for each wireless hardware
3871  * that can be used to drive LEDs if your driver registers a LED device.
3872  * This function returns the name (or %NULL if not configured for LEDs)
3873  * of the trigger so you can automatically link the LED device.
3874  *
3875  * @hw: the hardware to get the LED trigger name for
3876  *
3877  * Return: The name of the LED trigger. %NULL if not configured for LEDs.
3878  */
3879 static inline const char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
3880 {
3881 #ifdef CONFIG_MAC80211_LEDS
3882 	return __ieee80211_get_rx_led_name(hw);
3883 #else
3884 	return NULL;
3885 #endif
3886 }
3887 
3888 /**
3889  * ieee80211_get_assoc_led_name - get name of association LED
3890  *
3891  * mac80211 creates a association LED trigger for each wireless hardware
3892  * that can be used to drive LEDs if your driver registers a LED device.
3893  * This function returns the name (or %NULL if not configured for LEDs)
3894  * of the trigger so you can automatically link the LED device.
3895  *
3896  * @hw: the hardware to get the LED trigger name for
3897  *
3898  * Return: The name of the LED trigger. %NULL if not configured for LEDs.
3899  */
3900 static inline const char *ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
3901 {
3902 #ifdef CONFIG_MAC80211_LEDS
3903 	return __ieee80211_get_assoc_led_name(hw);
3904 #else
3905 	return NULL;
3906 #endif
3907 }
3908 
3909 /**
3910  * ieee80211_get_radio_led_name - get name of radio LED
3911  *
3912  * mac80211 creates a radio change LED trigger for each wireless hardware
3913  * that can be used to drive LEDs if your driver registers a LED device.
3914  * This function returns the name (or %NULL if not configured for LEDs)
3915  * of the trigger so you can automatically link the LED device.
3916  *
3917  * @hw: the hardware to get the LED trigger name for
3918  *
3919  * Return: The name of the LED trigger. %NULL if not configured for LEDs.
3920  */
3921 static inline const char *ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
3922 {
3923 #ifdef CONFIG_MAC80211_LEDS
3924 	return __ieee80211_get_radio_led_name(hw);
3925 #else
3926 	return NULL;
3927 #endif
3928 }
3929 
3930 /**
3931  * ieee80211_create_tpt_led_trigger - create throughput LED trigger
3932  * @hw: the hardware to create the trigger for
3933  * @flags: trigger flags, see &enum ieee80211_tpt_led_trigger_flags
3934  * @blink_table: the blink table -- needs to be ordered by throughput
3935  * @blink_table_len: size of the blink table
3936  *
3937  * Return: %NULL (in case of error, or if no LED triggers are
3938  * configured) or the name of the new trigger.
3939  *
3940  * Note: This function must be called before ieee80211_register_hw().
3941  */
3942 static inline const char *
3943 ieee80211_create_tpt_led_trigger(struct ieee80211_hw *hw, unsigned int flags,
3944 				 const struct ieee80211_tpt_blink *blink_table,
3945 				 unsigned int blink_table_len)
3946 {
3947 #ifdef CONFIG_MAC80211_LEDS
3948 	return __ieee80211_create_tpt_led_trigger(hw, flags, blink_table,
3949 						  blink_table_len);
3950 #else
3951 	return NULL;
3952 #endif
3953 }
3954 
3955 /**
3956  * ieee80211_unregister_hw - Unregister a hardware device
3957  *
3958  * This function instructs mac80211 to free allocated resources
3959  * and unregister netdevices from the networking subsystem.
3960  *
3961  * @hw: the hardware to unregister
3962  */
3963 void ieee80211_unregister_hw(struct ieee80211_hw *hw);
3964 
3965 /**
3966  * ieee80211_free_hw - free hardware descriptor
3967  *
3968  * This function frees everything that was allocated, including the
3969  * private data for the driver. You must call ieee80211_unregister_hw()
3970  * before calling this function.
3971  *
3972  * @hw: the hardware to free
3973  */
3974 void ieee80211_free_hw(struct ieee80211_hw *hw);
3975 
3976 /**
3977  * ieee80211_restart_hw - restart hardware completely
3978  *
3979  * Call this function when the hardware was restarted for some reason
3980  * (hardware error, ...) and the driver is unable to restore its state
3981  * by itself. mac80211 assumes that at this point the driver/hardware
3982  * is completely uninitialised and stopped, it starts the process by
3983  * calling the ->start() operation. The driver will need to reset all
3984  * internal state that it has prior to calling this function.
3985  *
3986  * @hw: the hardware to restart
3987  */
3988 void ieee80211_restart_hw(struct ieee80211_hw *hw);
3989 
3990 /**
3991  * ieee80211_rx_napi - receive frame from NAPI context
3992  *
3993  * Use this function to hand received frames to mac80211. The receive
3994  * buffer in @skb must start with an IEEE 802.11 header. In case of a
3995  * paged @skb is used, the driver is recommended to put the ieee80211
3996  * header of the frame on the linear part of the @skb to avoid memory
3997  * allocation and/or memcpy by the stack.
3998  *
3999  * This function may not be called in IRQ context. Calls to this function
4000  * for a single hardware must be synchronized against each other. Calls to
4001  * this function, ieee80211_rx_ni() and ieee80211_rx_irqsafe() may not be
4002  * mixed for a single hardware. Must not run concurrently with
4003  * ieee80211_tx_status() or ieee80211_tx_status_ni().
4004  *
4005  * This function must be called with BHs disabled.
4006  *
4007  * @hw: the hardware this frame came in on
4008  * @sta: the station the frame was received from, or %NULL
4009  * @skb: the buffer to receive, owned by mac80211 after this call
4010  * @napi: the NAPI context
4011  */
4012 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
4013 		       struct sk_buff *skb, struct napi_struct *napi);
4014 
4015 /**
4016  * ieee80211_rx - receive frame
4017  *
4018  * Use this function to hand received frames to mac80211. The receive
4019  * buffer in @skb must start with an IEEE 802.11 header. In case of a
4020  * paged @skb is used, the driver is recommended to put the ieee80211
4021  * header of the frame on the linear part of the @skb to avoid memory
4022  * allocation and/or memcpy by the stack.
4023  *
4024  * This function may not be called in IRQ context. Calls to this function
4025  * for a single hardware must be synchronized against each other. Calls to
4026  * this function, ieee80211_rx_ni() and ieee80211_rx_irqsafe() may not be
4027  * mixed for a single hardware. Must not run concurrently with
4028  * ieee80211_tx_status() or ieee80211_tx_status_ni().
4029  *
4030  * In process context use instead ieee80211_rx_ni().
4031  *
4032  * @hw: the hardware this frame came in on
4033  * @skb: the buffer to receive, owned by mac80211 after this call
4034  */
4035 static inline void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
4036 {
4037 	ieee80211_rx_napi(hw, NULL, skb, NULL);
4038 }
4039 
4040 /**
4041  * ieee80211_rx_irqsafe - receive frame
4042  *
4043  * Like ieee80211_rx() but can be called in IRQ context
4044  * (internally defers to a tasklet.)
4045  *
4046  * Calls to this function, ieee80211_rx() or ieee80211_rx_ni() may not
4047  * be mixed for a single hardware.Must not run concurrently with
4048  * ieee80211_tx_status() or ieee80211_tx_status_ni().
4049  *
4050  * @hw: the hardware this frame came in on
4051  * @skb: the buffer to receive, owned by mac80211 after this call
4052  */
4053 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb);
4054 
4055 /**
4056  * ieee80211_rx_ni - receive frame (in process context)
4057  *
4058  * Like ieee80211_rx() but can be called in process context
4059  * (internally disables bottom halves).
4060  *
4061  * Calls to this function, ieee80211_rx() and ieee80211_rx_irqsafe() may
4062  * not be mixed for a single hardware. Must not run concurrently with
4063  * ieee80211_tx_status() or ieee80211_tx_status_ni().
4064  *
4065  * @hw: the hardware this frame came in on
4066  * @skb: the buffer to receive, owned by mac80211 after this call
4067  */
4068 static inline void ieee80211_rx_ni(struct ieee80211_hw *hw,
4069 				   struct sk_buff *skb)
4070 {
4071 	local_bh_disable();
4072 	ieee80211_rx(hw, skb);
4073 	local_bh_enable();
4074 }
4075 
4076 /**
4077  * ieee80211_sta_ps_transition - PS transition for connected sta
4078  *
4079  * When operating in AP mode with the %IEEE80211_HW_AP_LINK_PS
4080  * flag set, use this function to inform mac80211 about a connected station
4081  * entering/leaving PS mode.
4082  *
4083  * This function may not be called in IRQ context or with softirqs enabled.
4084  *
4085  * Calls to this function for a single hardware must be synchronized against
4086  * each other.
4087  *
4088  * @sta: currently connected sta
4089  * @start: start or stop PS
4090  *
4091  * Return: 0 on success. -EINVAL when the requested PS mode is already set.
4092  */
4093 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start);
4094 
4095 /**
4096  * ieee80211_sta_ps_transition_ni - PS transition for connected sta
4097  *                                  (in process context)
4098  *
4099  * Like ieee80211_sta_ps_transition() but can be called in process context
4100  * (internally disables bottom halves). Concurrent call restriction still
4101  * applies.
4102  *
4103  * @sta: currently connected sta
4104  * @start: start or stop PS
4105  *
4106  * Return: Like ieee80211_sta_ps_transition().
4107  */
4108 static inline int ieee80211_sta_ps_transition_ni(struct ieee80211_sta *sta,
4109 						  bool start)
4110 {
4111 	int ret;
4112 
4113 	local_bh_disable();
4114 	ret = ieee80211_sta_ps_transition(sta, start);
4115 	local_bh_enable();
4116 
4117 	return ret;
4118 }
4119 
4120 /**
4121  * ieee80211_sta_pspoll - PS-Poll frame received
4122  * @sta: currently connected station
4123  *
4124  * When operating in AP mode with the %IEEE80211_HW_AP_LINK_PS flag set,
4125  * use this function to inform mac80211 that a PS-Poll frame from a
4126  * connected station was received.
4127  * This must be used in conjunction with ieee80211_sta_ps_transition()
4128  * and possibly ieee80211_sta_uapsd_trigger(); calls to all three must
4129  * be serialized.
4130  */
4131 void ieee80211_sta_pspoll(struct ieee80211_sta *sta);
4132 
4133 /**
4134  * ieee80211_sta_uapsd_trigger - (potential) U-APSD trigger frame received
4135  * @sta: currently connected station
4136  * @tid: TID of the received (potential) trigger frame
4137  *
4138  * When operating in AP mode with the %IEEE80211_HW_AP_LINK_PS flag set,
4139  * use this function to inform mac80211 that a (potential) trigger frame
4140  * from a connected station was received.
4141  * This must be used in conjunction with ieee80211_sta_ps_transition()
4142  * and possibly ieee80211_sta_pspoll(); calls to all three must be
4143  * serialized.
4144  * %IEEE80211_NUM_TIDS can be passed as the tid if the tid is unknown.
4145  * In this case, mac80211 will not check that this tid maps to an AC
4146  * that is trigger enabled and assume that the caller did the proper
4147  * checks.
4148  */
4149 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *sta, u8 tid);
4150 
4151 /*
4152  * The TX headroom reserved by mac80211 for its own tx_status functions.
4153  * This is enough for the radiotap header.
4154  */
4155 #define IEEE80211_TX_STATUS_HEADROOM	14
4156 
4157 /**
4158  * ieee80211_sta_set_buffered - inform mac80211 about driver-buffered frames
4159  * @sta: &struct ieee80211_sta pointer for the sleeping station
4160  * @tid: the TID that has buffered frames
4161  * @buffered: indicates whether or not frames are buffered for this TID
4162  *
4163  * If a driver buffers frames for a powersave station instead of passing
4164  * them back to mac80211 for retransmission, the station may still need
4165  * to be told that there are buffered frames via the TIM bit.
4166  *
4167  * This function informs mac80211 whether or not there are frames that are
4168  * buffered in the driver for a given TID; mac80211 can then use this data
4169  * to set the TIM bit (NOTE: This may call back into the driver's set_tim
4170  * call! Beware of the locking!)
4171  *
4172  * If all frames are released to the station (due to PS-poll or uAPSD)
4173  * then the driver needs to inform mac80211 that there no longer are
4174  * frames buffered. However, when the station wakes up mac80211 assumes
4175  * that all buffered frames will be transmitted and clears this data,
4176  * drivers need to make sure they inform mac80211 about all buffered
4177  * frames on the sleep transition (sta_notify() with %STA_NOTIFY_SLEEP).
4178  *
4179  * Note that technically mac80211 only needs to know this per AC, not per
4180  * TID, but since driver buffering will inevitably happen per TID (since
4181  * it is related to aggregation) it is easier to make mac80211 map the
4182  * TID to the AC as required instead of keeping track in all drivers that
4183  * use this API.
4184  */
4185 void ieee80211_sta_set_buffered(struct ieee80211_sta *sta,
4186 				u8 tid, bool buffered);
4187 
4188 /**
4189  * ieee80211_get_tx_rates - get the selected transmit rates for a packet
4190  *
4191  * Call this function in a driver with per-packet rate selection support
4192  * to combine the rate info in the packet tx info with the most recent
4193  * rate selection table for the station entry.
4194  *
4195  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4196  * @sta: the receiver station to which this packet is sent.
4197  * @skb: the frame to be transmitted.
4198  * @dest: buffer for extracted rate/retry information
4199  * @max_rates: maximum number of rates to fetch
4200  */
4201 void ieee80211_get_tx_rates(struct ieee80211_vif *vif,
4202 			    struct ieee80211_sta *sta,
4203 			    struct sk_buff *skb,
4204 			    struct ieee80211_tx_rate *dest,
4205 			    int max_rates);
4206 
4207 /**
4208  * ieee80211_sta_set_expected_throughput - set the expected tpt for a station
4209  *
4210  * Call this function to notify mac80211 about a change in expected throughput
4211  * to a station. A driver for a device that does rate control in firmware can
4212  * call this function when the expected throughput estimate towards a station
4213  * changes. The information is used to tune the CoDel AQM applied to traffic
4214  * going towards that station (which can otherwise be too aggressive and cause
4215  * slow stations to starve).
4216  *
4217  * @pubsta: the station to set throughput for.
4218  * @thr: the current expected throughput in kbps.
4219  */
4220 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
4221 					   u32 thr);
4222 
4223 /**
4224  * ieee80211_tx_status - transmit status callback
4225  *
4226  * Call this function for all transmitted frames after they have been
4227  * transmitted. It is permissible to not call this function for
4228  * multicast frames but this can affect statistics.
4229  *
4230  * This function may not be called in IRQ context. Calls to this function
4231  * for a single hardware must be synchronized against each other. Calls
4232  * to this function, ieee80211_tx_status_ni() and ieee80211_tx_status_irqsafe()
4233  * may not be mixed for a single hardware. Must not run concurrently with
4234  * ieee80211_rx() or ieee80211_rx_ni().
4235  *
4236  * @hw: the hardware the frame was transmitted by
4237  * @skb: the frame that was transmitted, owned by mac80211 after this call
4238  */
4239 void ieee80211_tx_status(struct ieee80211_hw *hw,
4240 			 struct sk_buff *skb);
4241 
4242 /**
4243  * ieee80211_tx_status_ext - extended transmit status callback
4244  *
4245  * This function can be used as a replacement for ieee80211_tx_status
4246  * in drivers that may want to provide extra information that does not
4247  * fit into &struct ieee80211_tx_info.
4248  *
4249  * Calls to this function for a single hardware must be synchronized
4250  * against each other. Calls to this function, ieee80211_tx_status_ni()
4251  * and ieee80211_tx_status_irqsafe() may not be mixed for a single hardware.
4252  *
4253  * @hw: the hardware the frame was transmitted by
4254  * @status: tx status information
4255  */
4256 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
4257 			     struct ieee80211_tx_status *status);
4258 
4259 /**
4260  * ieee80211_tx_status_noskb - transmit status callback without skb
4261  *
4262  * This function can be used as a replacement for ieee80211_tx_status
4263  * in drivers that cannot reliably map tx status information back to
4264  * specific skbs.
4265  *
4266  * Calls to this function for a single hardware must be synchronized
4267  * against each other. Calls to this function, ieee80211_tx_status_ni()
4268  * and ieee80211_tx_status_irqsafe() may not be mixed for a single hardware.
4269  *
4270  * @hw: the hardware the frame was transmitted by
4271  * @sta: the receiver station to which this packet is sent
4272  *	(NULL for multicast packets)
4273  * @info: tx status information
4274  */
4275 static inline void ieee80211_tx_status_noskb(struct ieee80211_hw *hw,
4276 					     struct ieee80211_sta *sta,
4277 					     struct ieee80211_tx_info *info)
4278 {
4279 	struct ieee80211_tx_status status = {
4280 		.sta = sta,
4281 		.info = info,
4282 	};
4283 
4284 	ieee80211_tx_status_ext(hw, &status);
4285 }
4286 
4287 /**
4288  * ieee80211_tx_status_ni - transmit status callback (in process context)
4289  *
4290  * Like ieee80211_tx_status() but can be called in process context.
4291  *
4292  * Calls to this function, ieee80211_tx_status() and
4293  * ieee80211_tx_status_irqsafe() may not be mixed
4294  * for a single hardware.
4295  *
4296  * @hw: the hardware the frame was transmitted by
4297  * @skb: the frame that was transmitted, owned by mac80211 after this call
4298  */
4299 static inline void ieee80211_tx_status_ni(struct ieee80211_hw *hw,
4300 					  struct sk_buff *skb)
4301 {
4302 	local_bh_disable();
4303 	ieee80211_tx_status(hw, skb);
4304 	local_bh_enable();
4305 }
4306 
4307 /**
4308  * ieee80211_tx_status_irqsafe - IRQ-safe transmit status callback
4309  *
4310  * Like ieee80211_tx_status() but can be called in IRQ context
4311  * (internally defers to a tasklet.)
4312  *
4313  * Calls to this function, ieee80211_tx_status() and
4314  * ieee80211_tx_status_ni() may not be mixed for a single hardware.
4315  *
4316  * @hw: the hardware the frame was transmitted by
4317  * @skb: the frame that was transmitted, owned by mac80211 after this call
4318  */
4319 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
4320 				 struct sk_buff *skb);
4321 
4322 /**
4323  * ieee80211_report_low_ack - report non-responding station
4324  *
4325  * When operating in AP-mode, call this function to report a non-responding
4326  * connected STA.
4327  *
4328  * @sta: the non-responding connected sta
4329  * @num_packets: number of packets sent to @sta without a response
4330  */
4331 void ieee80211_report_low_ack(struct ieee80211_sta *sta, u32 num_packets);
4332 
4333 #define IEEE80211_MAX_CSA_COUNTERS_NUM 2
4334 
4335 /**
4336  * struct ieee80211_mutable_offsets - mutable beacon offsets
4337  * @tim_offset: position of TIM element
4338  * @tim_length: size of TIM element
4339  * @csa_counter_offs: array of IEEE80211_MAX_CSA_COUNTERS_NUM offsets
4340  *	to CSA counters.  This array can contain zero values which
4341  *	should be ignored.
4342  */
4343 struct ieee80211_mutable_offsets {
4344 	u16 tim_offset;
4345 	u16 tim_length;
4346 
4347 	u16 csa_counter_offs[IEEE80211_MAX_CSA_COUNTERS_NUM];
4348 };
4349 
4350 /**
4351  * ieee80211_beacon_get_template - beacon template generation function
4352  * @hw: pointer obtained from ieee80211_alloc_hw().
4353  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4354  * @offs: &struct ieee80211_mutable_offsets pointer to struct that will
4355  *	receive the offsets that may be updated by the driver.
4356  *
4357  * If the driver implements beaconing modes, it must use this function to
4358  * obtain the beacon template.
4359  *
4360  * This function should be used if the beacon frames are generated by the
4361  * device, and then the driver must use the returned beacon as the template
4362  * The driver or the device are responsible to update the DTIM and, when
4363  * applicable, the CSA count.
4364  *
4365  * The driver is responsible for freeing the returned skb.
4366  *
4367  * Return: The beacon template. %NULL on error.
4368  */
4369 struct sk_buff *
4370 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4371 			      struct ieee80211_vif *vif,
4372 			      struct ieee80211_mutable_offsets *offs);
4373 
4374 /**
4375  * ieee80211_beacon_get_tim - beacon generation function
4376  * @hw: pointer obtained from ieee80211_alloc_hw().
4377  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4378  * @tim_offset: pointer to variable that will receive the TIM IE offset.
4379  *	Set to 0 if invalid (in non-AP modes).
4380  * @tim_length: pointer to variable that will receive the TIM IE length,
4381  *	(including the ID and length bytes!).
4382  *	Set to 0 if invalid (in non-AP modes).
4383  *
4384  * If the driver implements beaconing modes, it must use this function to
4385  * obtain the beacon frame.
4386  *
4387  * If the beacon frames are generated by the host system (i.e., not in
4388  * hardware/firmware), the driver uses this function to get each beacon
4389  * frame from mac80211 -- it is responsible for calling this function exactly
4390  * once before the beacon is needed (e.g. based on hardware interrupt).
4391  *
4392  * The driver is responsible for freeing the returned skb.
4393  *
4394  * Return: The beacon template. %NULL on error.
4395  */
4396 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4397 					 struct ieee80211_vif *vif,
4398 					 u16 *tim_offset, u16 *tim_length);
4399 
4400 /**
4401  * ieee80211_beacon_get - beacon generation function
4402  * @hw: pointer obtained from ieee80211_alloc_hw().
4403  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4404  *
4405  * See ieee80211_beacon_get_tim().
4406  *
4407  * Return: See ieee80211_beacon_get_tim().
4408  */
4409 static inline struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
4410 						   struct ieee80211_vif *vif)
4411 {
4412 	return ieee80211_beacon_get_tim(hw, vif, NULL, NULL);
4413 }
4414 
4415 /**
4416  * ieee80211_csa_update_counter - request mac80211 to decrement the csa counter
4417  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4418  *
4419  * The csa counter should be updated after each beacon transmission.
4420  * This function is called implicitly when
4421  * ieee80211_beacon_get/ieee80211_beacon_get_tim are called, however if the
4422  * beacon frames are generated by the device, the driver should call this
4423  * function after each beacon transmission to sync mac80211's csa counters.
4424  *
4425  * Return: new csa counter value
4426  */
4427 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif);
4428 
4429 /**
4430  * ieee80211_csa_finish - notify mac80211 about channel switch
4431  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4432  *
4433  * After a channel switch announcement was scheduled and the counter in this
4434  * announcement hits 1, this function must be called by the driver to
4435  * notify mac80211 that the channel can be changed.
4436  */
4437 void ieee80211_csa_finish(struct ieee80211_vif *vif);
4438 
4439 /**
4440  * ieee80211_csa_is_complete - find out if counters reached 1
4441  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4442  *
4443  * This function returns whether the channel switch counters reached zero.
4444  */
4445 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif);
4446 
4447 
4448 /**
4449  * ieee80211_proberesp_get - retrieve a Probe Response template
4450  * @hw: pointer obtained from ieee80211_alloc_hw().
4451  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4452  *
4453  * Creates a Probe Response template which can, for example, be uploaded to
4454  * hardware. The destination address should be set by the caller.
4455  *
4456  * Can only be called in AP mode.
4457  *
4458  * Return: The Probe Response template. %NULL on error.
4459  */
4460 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4461 					struct ieee80211_vif *vif);
4462 
4463 /**
4464  * ieee80211_pspoll_get - retrieve a PS Poll template
4465  * @hw: pointer obtained from ieee80211_alloc_hw().
4466  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4467  *
4468  * Creates a PS Poll a template which can, for example, uploaded to
4469  * hardware. The template must be updated after association so that correct
4470  * AID, BSSID and MAC address is used.
4471  *
4472  * Note: Caller (or hardware) is responsible for setting the
4473  * &IEEE80211_FCTL_PM bit.
4474  *
4475  * Return: The PS Poll template. %NULL on error.
4476  */
4477 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4478 				     struct ieee80211_vif *vif);
4479 
4480 /**
4481  * ieee80211_nullfunc_get - retrieve a nullfunc template
4482  * @hw: pointer obtained from ieee80211_alloc_hw().
4483  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4484  *
4485  * Creates a Nullfunc template which can, for example, uploaded to
4486  * hardware. The template must be updated after association so that correct
4487  * BSSID and address is used.
4488  *
4489  * Note: Caller (or hardware) is responsible for setting the
4490  * &IEEE80211_FCTL_PM bit as well as Duration and Sequence Control fields.
4491  *
4492  * Return: The nullfunc template. %NULL on error.
4493  */
4494 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4495 				       struct ieee80211_vif *vif);
4496 
4497 /**
4498  * ieee80211_probereq_get - retrieve a Probe Request template
4499  * @hw: pointer obtained from ieee80211_alloc_hw().
4500  * @src_addr: source MAC address
4501  * @ssid: SSID buffer
4502  * @ssid_len: length of SSID
4503  * @tailroom: tailroom to reserve at end of SKB for IEs
4504  *
4505  * Creates a Probe Request template which can, for example, be uploaded to
4506  * hardware.
4507  *
4508  * Return: The Probe Request template. %NULL on error.
4509  */
4510 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4511 				       const u8 *src_addr,
4512 				       const u8 *ssid, size_t ssid_len,
4513 				       size_t tailroom);
4514 
4515 /**
4516  * ieee80211_rts_get - RTS frame generation function
4517  * @hw: pointer obtained from ieee80211_alloc_hw().
4518  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4519  * @frame: pointer to the frame that is going to be protected by the RTS.
4520  * @frame_len: the frame length (in octets).
4521  * @frame_txctl: &struct ieee80211_tx_info of the frame.
4522  * @rts: The buffer where to store the RTS frame.
4523  *
4524  * If the RTS frames are generated by the host system (i.e., not in
4525  * hardware/firmware), the low-level driver uses this function to receive
4526  * the next RTS frame from the 802.11 code. The low-level is responsible
4527  * for calling this function before and RTS frame is needed.
4528  */
4529 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4530 		       const void *frame, size_t frame_len,
4531 		       const struct ieee80211_tx_info *frame_txctl,
4532 		       struct ieee80211_rts *rts);
4533 
4534 /**
4535  * ieee80211_rts_duration - Get the duration field for an RTS frame
4536  * @hw: pointer obtained from ieee80211_alloc_hw().
4537  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4538  * @frame_len: the length of the frame that is going to be protected by the RTS.
4539  * @frame_txctl: &struct ieee80211_tx_info of the frame.
4540  *
4541  * If the RTS is generated in firmware, but the host system must provide
4542  * the duration field, the low-level driver uses this function to receive
4543  * the duration field value in little-endian byteorder.
4544  *
4545  * Return: The duration.
4546  */
4547 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
4548 			      struct ieee80211_vif *vif, size_t frame_len,
4549 			      const struct ieee80211_tx_info *frame_txctl);
4550 
4551 /**
4552  * ieee80211_ctstoself_get - CTS-to-self frame generation function
4553  * @hw: pointer obtained from ieee80211_alloc_hw().
4554  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4555  * @frame: pointer to the frame that is going to be protected by the CTS-to-self.
4556  * @frame_len: the frame length (in octets).
4557  * @frame_txctl: &struct ieee80211_tx_info of the frame.
4558  * @cts: The buffer where to store the CTS-to-self frame.
4559  *
4560  * If the CTS-to-self frames are generated by the host system (i.e., not in
4561  * hardware/firmware), the low-level driver uses this function to receive
4562  * the next CTS-to-self frame from the 802.11 code. The low-level is responsible
4563  * for calling this function before and CTS-to-self frame is needed.
4564  */
4565 void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
4566 			     struct ieee80211_vif *vif,
4567 			     const void *frame, size_t frame_len,
4568 			     const struct ieee80211_tx_info *frame_txctl,
4569 			     struct ieee80211_cts *cts);
4570 
4571 /**
4572  * ieee80211_ctstoself_duration - Get the duration field for a CTS-to-self frame
4573  * @hw: pointer obtained from ieee80211_alloc_hw().
4574  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4575  * @frame_len: the length of the frame that is going to be protected by the CTS-to-self.
4576  * @frame_txctl: &struct ieee80211_tx_info of the frame.
4577  *
4578  * If the CTS-to-self is generated in firmware, but the host system must provide
4579  * the duration field, the low-level driver uses this function to receive
4580  * the duration field value in little-endian byteorder.
4581  *
4582  * Return: The duration.
4583  */
4584 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
4585 				    struct ieee80211_vif *vif,
4586 				    size_t frame_len,
4587 				    const struct ieee80211_tx_info *frame_txctl);
4588 
4589 /**
4590  * ieee80211_generic_frame_duration - Calculate the duration field for a frame
4591  * @hw: pointer obtained from ieee80211_alloc_hw().
4592  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4593  * @band: the band to calculate the frame duration on
4594  * @frame_len: the length of the frame.
4595  * @rate: the rate at which the frame is going to be transmitted.
4596  *
4597  * Calculate the duration field of some generic frame, given its
4598  * length and transmission rate (in 100kbps).
4599  *
4600  * Return: The duration.
4601  */
4602 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
4603 					struct ieee80211_vif *vif,
4604 					enum nl80211_band band,
4605 					size_t frame_len,
4606 					struct ieee80211_rate *rate);
4607 
4608 /**
4609  * ieee80211_get_buffered_bc - accessing buffered broadcast and multicast frames
4610  * @hw: pointer as obtained from ieee80211_alloc_hw().
4611  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
4612  *
4613  * Function for accessing buffered broadcast and multicast frames. If
4614  * hardware/firmware does not implement buffering of broadcast/multicast
4615  * frames when power saving is used, 802.11 code buffers them in the host
4616  * memory. The low-level driver uses this function to fetch next buffered
4617  * frame. In most cases, this is used when generating beacon frame.
4618  *
4619  * Return: A pointer to the next buffered skb or NULL if no more buffered
4620  * frames are available.
4621  *
4622  * Note: buffered frames are returned only after DTIM beacon frame was
4623  * generated with ieee80211_beacon_get() and the low-level driver must thus
4624  * call ieee80211_beacon_get() first. ieee80211_get_buffered_bc() returns
4625  * NULL if the previous generated beacon was not DTIM, so the low-level driver
4626  * does not need to check for DTIM beacons separately and should be able to
4627  * use common code for all beacons.
4628  */
4629 struct sk_buff *
4630 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
4631 
4632 /**
4633  * ieee80211_get_tkip_p1k_iv - get a TKIP phase 1 key for IV32
4634  *
4635  * This function returns the TKIP phase 1 key for the given IV32.
4636  *
4637  * @keyconf: the parameter passed with the set key
4638  * @iv32: IV32 to get the P1K for
4639  * @p1k: a buffer to which the key will be written, as 5 u16 values
4640  */
4641 void ieee80211_get_tkip_p1k_iv(struct ieee80211_key_conf *keyconf,
4642 			       u32 iv32, u16 *p1k);
4643 
4644 /**
4645  * ieee80211_get_tkip_p1k - get a TKIP phase 1 key
4646  *
4647  * This function returns the TKIP phase 1 key for the IV32 taken
4648  * from the given packet.
4649  *
4650  * @keyconf: the parameter passed with the set key
4651  * @skb: the packet to take the IV32 value from that will be encrypted
4652  *	with this P1K
4653  * @p1k: a buffer to which the key will be written, as 5 u16 values
4654  */
4655 static inline void ieee80211_get_tkip_p1k(struct ieee80211_key_conf *keyconf,
4656 					  struct sk_buff *skb, u16 *p1k)
4657 {
4658 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
4659 	const u8 *data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
4660 	u32 iv32 = get_unaligned_le32(&data[4]);
4661 
4662 	ieee80211_get_tkip_p1k_iv(keyconf, iv32, p1k);
4663 }
4664 
4665 /**
4666  * ieee80211_get_tkip_rx_p1k - get a TKIP phase 1 key for RX
4667  *
4668  * This function returns the TKIP phase 1 key for the given IV32
4669  * and transmitter address.
4670  *
4671  * @keyconf: the parameter passed with the set key
4672  * @ta: TA that will be used with the key
4673  * @iv32: IV32 to get the P1K for
4674  * @p1k: a buffer to which the key will be written, as 5 u16 values
4675  */
4676 void ieee80211_get_tkip_rx_p1k(struct ieee80211_key_conf *keyconf,
4677 			       const u8 *ta, u32 iv32, u16 *p1k);
4678 
4679 /**
4680  * ieee80211_get_tkip_p2k - get a TKIP phase 2 key
4681  *
4682  * This function computes the TKIP RC4 key for the IV values
4683  * in the packet.
4684  *
4685  * @keyconf: the parameter passed with the set key
4686  * @skb: the packet to take the IV32/IV16 values from that will be
4687  *	encrypted with this key
4688  * @p2k: a buffer to which the key will be written, 16 bytes
4689  */
4690 void ieee80211_get_tkip_p2k(struct ieee80211_key_conf *keyconf,
4691 			    struct sk_buff *skb, u8 *p2k);
4692 
4693 /**
4694  * ieee80211_tkip_add_iv - write TKIP IV and Ext. IV to pos
4695  *
4696  * @pos: start of crypto header
4697  * @keyconf: the parameter passed with the set key
4698  * @pn: PN to add
4699  *
4700  * Returns: pointer to the octet following IVs (i.e. beginning of
4701  * the packet payload)
4702  *
4703  * This function writes the tkip IV value to pos (which should
4704  * point to the crypto header)
4705  */
4706 u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key_conf *keyconf, u64 pn);
4707 
4708 /**
4709  * ieee80211_get_key_rx_seq - get key RX sequence counter
4710  *
4711  * @keyconf: the parameter passed with the set key
4712  * @tid: The TID, or -1 for the management frame value (CCMP/GCMP only);
4713  *	the value on TID 0 is also used for non-QoS frames. For
4714  *	CMAC, only TID 0 is valid.
4715  * @seq: buffer to receive the sequence data
4716  *
4717  * This function allows a driver to retrieve the current RX IV/PNs
4718  * for the given key. It must not be called if IV checking is done
4719  * by the device and not by mac80211.
4720  *
4721  * Note that this function may only be called when no RX processing
4722  * can be done concurrently.
4723  */
4724 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
4725 			      int tid, struct ieee80211_key_seq *seq);
4726 
4727 /**
4728  * ieee80211_set_key_rx_seq - set key RX sequence counter
4729  *
4730  * @keyconf: the parameter passed with the set key
4731  * @tid: The TID, or -1 for the management frame value (CCMP/GCMP only);
4732  *	the value on TID 0 is also used for non-QoS frames. For
4733  *	CMAC, only TID 0 is valid.
4734  * @seq: new sequence data
4735  *
4736  * This function allows a driver to set the current RX IV/PNs for the
4737  * given key. This is useful when resuming from WoWLAN sleep and GTK
4738  * rekey may have been done while suspended. It should not be called
4739  * if IV checking is done by the device and not by mac80211.
4740  *
4741  * Note that this function may only be called when no RX processing
4742  * can be done concurrently.
4743  */
4744 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
4745 			      int tid, struct ieee80211_key_seq *seq);
4746 
4747 /**
4748  * ieee80211_remove_key - remove the given key
4749  * @keyconf: the parameter passed with the set key
4750  *
4751  * Remove the given key. If the key was uploaded to the hardware at the
4752  * time this function is called, it is not deleted in the hardware but
4753  * instead assumed to have been removed already.
4754  *
4755  * Note that due to locking considerations this function can (currently)
4756  * only be called during key iteration (ieee80211_iter_keys().)
4757  */
4758 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf);
4759 
4760 /**
4761  * ieee80211_gtk_rekey_add - add a GTK key from rekeying during WoWLAN
4762  * @vif: the virtual interface to add the key on
4763  * @keyconf: new key data
4764  *
4765  * When GTK rekeying was done while the system was suspended, (a) new
4766  * key(s) will be available. These will be needed by mac80211 for proper
4767  * RX processing, so this function allows setting them.
4768  *
4769  * The function returns the newly allocated key structure, which will
4770  * have similar contents to the passed key configuration but point to
4771  * mac80211-owned memory. In case of errors, the function returns an
4772  * ERR_PTR(), use IS_ERR() etc.
4773  *
4774  * Note that this function assumes the key isn't added to hardware
4775  * acceleration, so no TX will be done with the key. Since it's a GTK
4776  * on managed (station) networks, this is true anyway. If the driver
4777  * calls this function from the resume callback and subsequently uses
4778  * the return code 1 to reconfigure the device, this key will be part
4779  * of the reconfiguration.
4780  *
4781  * Note that the driver should also call ieee80211_set_key_rx_seq()
4782  * for the new key for each TID to set up sequence counters properly.
4783  *
4784  * IMPORTANT: If this replaces a key that is present in the hardware,
4785  * then it will attempt to remove it during this call. In many cases
4786  * this isn't what you want, so call ieee80211_remove_key() first for
4787  * the key that's being replaced.
4788  */
4789 struct ieee80211_key_conf *
4790 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
4791 			struct ieee80211_key_conf *keyconf);
4792 
4793 /**
4794  * ieee80211_gtk_rekey_notify - notify userspace supplicant of rekeying
4795  * @vif: virtual interface the rekeying was done on
4796  * @bssid: The BSSID of the AP, for checking association
4797  * @replay_ctr: the new replay counter after GTK rekeying
4798  * @gfp: allocation flags
4799  */
4800 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
4801 				const u8 *replay_ctr, gfp_t gfp);
4802 
4803 /**
4804  * ieee80211_wake_queue - wake specific queue
4805  * @hw: pointer as obtained from ieee80211_alloc_hw().
4806  * @queue: queue number (counted from zero).
4807  *
4808  * Drivers should use this function instead of netif_wake_queue.
4809  */
4810 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue);
4811 
4812 /**
4813  * ieee80211_stop_queue - stop specific queue
4814  * @hw: pointer as obtained from ieee80211_alloc_hw().
4815  * @queue: queue number (counted from zero).
4816  *
4817  * Drivers should use this function instead of netif_stop_queue.
4818  */
4819 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue);
4820 
4821 /**
4822  * ieee80211_queue_stopped - test status of the queue
4823  * @hw: pointer as obtained from ieee80211_alloc_hw().
4824  * @queue: queue number (counted from zero).
4825  *
4826  * Drivers should use this function instead of netif_stop_queue.
4827  *
4828  * Return: %true if the queue is stopped. %false otherwise.
4829  */
4830 
4831 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue);
4832 
4833 /**
4834  * ieee80211_stop_queues - stop all queues
4835  * @hw: pointer as obtained from ieee80211_alloc_hw().
4836  *
4837  * Drivers should use this function instead of netif_stop_queue.
4838  */
4839 void ieee80211_stop_queues(struct ieee80211_hw *hw);
4840 
4841 /**
4842  * ieee80211_wake_queues - wake all queues
4843  * @hw: pointer as obtained from ieee80211_alloc_hw().
4844  *
4845  * Drivers should use this function instead of netif_wake_queue.
4846  */
4847 void ieee80211_wake_queues(struct ieee80211_hw *hw);
4848 
4849 /**
4850  * ieee80211_scan_completed - completed hardware scan
4851  *
4852  * When hardware scan offload is used (i.e. the hw_scan() callback is
4853  * assigned) this function needs to be called by the driver to notify
4854  * mac80211 that the scan finished. This function can be called from
4855  * any context, including hardirq context.
4856  *
4857  * @hw: the hardware that finished the scan
4858  * @info: information about the completed scan
4859  */
4860 void ieee80211_scan_completed(struct ieee80211_hw *hw,
4861 			      struct cfg80211_scan_info *info);
4862 
4863 /**
4864  * ieee80211_sched_scan_results - got results from scheduled scan
4865  *
4866  * When a scheduled scan is running, this function needs to be called by the
4867  * driver whenever there are new scan results available.
4868  *
4869  * @hw: the hardware that is performing scheduled scans
4870  */
4871 void ieee80211_sched_scan_results(struct ieee80211_hw *hw);
4872 
4873 /**
4874  * ieee80211_sched_scan_stopped - inform that the scheduled scan has stopped
4875  *
4876  * When a scheduled scan is running, this function can be called by
4877  * the driver if it needs to stop the scan to perform another task.
4878  * Usual scenarios are drivers that cannot continue the scheduled scan
4879  * while associating, for instance.
4880  *
4881  * @hw: the hardware that is performing scheduled scans
4882  */
4883 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw);
4884 
4885 /**
4886  * enum ieee80211_interface_iteration_flags - interface iteration flags
4887  * @IEEE80211_IFACE_ITER_NORMAL: Iterate over all interfaces that have
4888  *	been added to the driver; However, note that during hardware
4889  *	reconfiguration (after restart_hw) it will iterate over a new
4890  *	interface and over all the existing interfaces even if they
4891  *	haven't been re-added to the driver yet.
4892  * @IEEE80211_IFACE_ITER_RESUME_ALL: During resume, iterate over all
4893  *	interfaces, even if they haven't been re-added to the driver yet.
4894  * @IEEE80211_IFACE_ITER_ACTIVE: Iterate only active interfaces (netdev is up).
4895  */
4896 enum ieee80211_interface_iteration_flags {
4897 	IEEE80211_IFACE_ITER_NORMAL	= 0,
4898 	IEEE80211_IFACE_ITER_RESUME_ALL	= BIT(0),
4899 	IEEE80211_IFACE_ITER_ACTIVE	= BIT(1),
4900 };
4901 
4902 /**
4903  * ieee80211_iterate_interfaces - iterate interfaces
4904  *
4905  * This function iterates over the interfaces associated with a given
4906  * hardware and calls the callback for them. This includes active as well as
4907  * inactive interfaces. This function allows the iterator function to sleep.
4908  * Will iterate over a new interface during add_interface().
4909  *
4910  * @hw: the hardware struct of which the interfaces should be iterated over
4911  * @iter_flags: iteration flags, see &enum ieee80211_interface_iteration_flags
4912  * @iterator: the iterator function to call
4913  * @data: first argument of the iterator function
4914  */
4915 void ieee80211_iterate_interfaces(struct ieee80211_hw *hw, u32 iter_flags,
4916 				  void (*iterator)(void *data, u8 *mac,
4917 						   struct ieee80211_vif *vif),
4918 				  void *data);
4919 
4920 /**
4921  * ieee80211_iterate_active_interfaces - iterate active interfaces
4922  *
4923  * This function iterates over the interfaces associated with a given
4924  * hardware that are currently active and calls the callback for them.
4925  * This function allows the iterator function to sleep, when the iterator
4926  * function is atomic @ieee80211_iterate_active_interfaces_atomic can
4927  * be used.
4928  * Does not iterate over a new interface during add_interface().
4929  *
4930  * @hw: the hardware struct of which the interfaces should be iterated over
4931  * @iter_flags: iteration flags, see &enum ieee80211_interface_iteration_flags
4932  * @iterator: the iterator function to call
4933  * @data: first argument of the iterator function
4934  */
4935 static inline void
4936 ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw, u32 iter_flags,
4937 				    void (*iterator)(void *data, u8 *mac,
4938 						     struct ieee80211_vif *vif),
4939 				    void *data)
4940 {
4941 	ieee80211_iterate_interfaces(hw,
4942 				     iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
4943 				     iterator, data);
4944 }
4945 
4946 /**
4947  * ieee80211_iterate_active_interfaces_atomic - iterate active interfaces
4948  *
4949  * This function iterates over the interfaces associated with a given
4950  * hardware that are currently active and calls the callback for them.
4951  * This function requires the iterator callback function to be atomic,
4952  * if that is not desired, use @ieee80211_iterate_active_interfaces instead.
4953  * Does not iterate over a new interface during add_interface().
4954  *
4955  * @hw: the hardware struct of which the interfaces should be iterated over
4956  * @iter_flags: iteration flags, see &enum ieee80211_interface_iteration_flags
4957  * @iterator: the iterator function to call, cannot sleep
4958  * @data: first argument of the iterator function
4959  */
4960 void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw,
4961 						u32 iter_flags,
4962 						void (*iterator)(void *data,
4963 						    u8 *mac,
4964 						    struct ieee80211_vif *vif),
4965 						void *data);
4966 
4967 /**
4968  * ieee80211_iterate_active_interfaces_rtnl - iterate active interfaces
4969  *
4970  * This function iterates over the interfaces associated with a given
4971  * hardware that are currently active and calls the callback for them.
4972  * This version can only be used while holding the RTNL.
4973  *
4974  * @hw: the hardware struct of which the interfaces should be iterated over
4975  * @iter_flags: iteration flags, see &enum ieee80211_interface_iteration_flags
4976  * @iterator: the iterator function to call, cannot sleep
4977  * @data: first argument of the iterator function
4978  */
4979 void ieee80211_iterate_active_interfaces_rtnl(struct ieee80211_hw *hw,
4980 					      u32 iter_flags,
4981 					      void (*iterator)(void *data,
4982 						u8 *mac,
4983 						struct ieee80211_vif *vif),
4984 					      void *data);
4985 
4986 /**
4987  * ieee80211_iterate_stations_atomic - iterate stations
4988  *
4989  * This function iterates over all stations associated with a given
4990  * hardware that are currently uploaded to the driver and calls the callback
4991  * function for them.
4992  * This function requires the iterator callback function to be atomic,
4993  *
4994  * @hw: the hardware struct of which the interfaces should be iterated over
4995  * @iterator: the iterator function to call, cannot sleep
4996  * @data: first argument of the iterator function
4997  */
4998 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
4999 				       void (*iterator)(void *data,
5000 						struct ieee80211_sta *sta),
5001 				       void *data);
5002 /**
5003  * ieee80211_queue_work - add work onto the mac80211 workqueue
5004  *
5005  * Drivers and mac80211 use this to add work onto the mac80211 workqueue.
5006  * This helper ensures drivers are not queueing work when they should not be.
5007  *
5008  * @hw: the hardware struct for the interface we are adding work for
5009  * @work: the work we want to add onto the mac80211 workqueue
5010  */
5011 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work);
5012 
5013 /**
5014  * ieee80211_queue_delayed_work - add work onto the mac80211 workqueue
5015  *
5016  * Drivers and mac80211 use this to queue delayed work onto the mac80211
5017  * workqueue.
5018  *
5019  * @hw: the hardware struct for the interface we are adding work for
5020  * @dwork: delayable work to queue onto the mac80211 workqueue
5021  * @delay: number of jiffies to wait before queueing
5022  */
5023 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
5024 				  struct delayed_work *dwork,
5025 				  unsigned long delay);
5026 
5027 /**
5028  * ieee80211_start_tx_ba_session - Start a tx Block Ack session.
5029  * @sta: the station for which to start a BA session
5030  * @tid: the TID to BA on.
5031  * @timeout: session timeout value (in TUs)
5032  *
5033  * Return: success if addBA request was sent, failure otherwise
5034  *
5035  * Although mac80211/low level driver/user space application can estimate
5036  * the need to start aggregation on a certain RA/TID, the session level
5037  * will be managed by the mac80211.
5038  */
5039 int ieee80211_start_tx_ba_session(struct ieee80211_sta *sta, u16 tid,
5040 				  u16 timeout);
5041 
5042 /**
5043  * ieee80211_start_tx_ba_cb_irqsafe - low level driver ready to aggregate.
5044  * @vif: &struct ieee80211_vif pointer from the add_interface callback
5045  * @ra: receiver address of the BA session recipient.
5046  * @tid: the TID to BA on.
5047  *
5048  * This function must be called by low level driver once it has
5049  * finished with preparations for the BA session. It can be called
5050  * from any context.
5051  */
5052 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, const u8 *ra,
5053 				      u16 tid);
5054 
5055 /**
5056  * ieee80211_stop_tx_ba_session - Stop a Block Ack session.
5057  * @sta: the station whose BA session to stop
5058  * @tid: the TID to stop BA.
5059  *
5060  * Return: negative error if the TID is invalid, or no aggregation active
5061  *
5062  * Although mac80211/low level driver/user space application can estimate
5063  * the need to stop aggregation on a certain RA/TID, the session level
5064  * will be managed by the mac80211.
5065  */
5066 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *sta, u16 tid);
5067 
5068 /**
5069  * ieee80211_stop_tx_ba_cb_irqsafe - low level driver ready to stop aggregate.
5070  * @vif: &struct ieee80211_vif pointer from the add_interface callback
5071  * @ra: receiver address of the BA session recipient.
5072  * @tid: the desired TID to BA on.
5073  *
5074  * This function must be called by low level driver once it has
5075  * finished with preparations for the BA session tear down. It
5076  * can be called from any context.
5077  */
5078 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, const u8 *ra,
5079 				     u16 tid);
5080 
5081 /**
5082  * ieee80211_find_sta - find a station
5083  *
5084  * @vif: virtual interface to look for station on
5085  * @addr: station's address
5086  *
5087  * Return: The station, if found. %NULL otherwise.
5088  *
5089  * Note: This function must be called under RCU lock and the
5090  * resulting pointer is only valid under RCU lock as well.
5091  */
5092 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
5093 					 const u8 *addr);
5094 
5095 /**
5096  * ieee80211_find_sta_by_ifaddr - find a station on hardware
5097  *
5098  * @hw: pointer as obtained from ieee80211_alloc_hw()
5099  * @addr: remote station's address
5100  * @localaddr: local address (vif->sdata->vif.addr). Use NULL for 'any'.
5101  *
5102  * Return: The station, if found. %NULL otherwise.
5103  *
5104  * Note: This function must be called under RCU lock and the
5105  * resulting pointer is only valid under RCU lock as well.
5106  *
5107  * NOTE: You may pass NULL for localaddr, but then you will just get
5108  *      the first STA that matches the remote address 'addr'.
5109  *      We can have multiple STA associated with multiple
5110  *      logical stations (e.g. consider a station connecting to another
5111  *      BSSID on the same AP hardware without disconnecting first).
5112  *      In this case, the result of this method with localaddr NULL
5113  *      is not reliable.
5114  *
5115  * DO NOT USE THIS FUNCTION with localaddr NULL if at all possible.
5116  */
5117 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
5118 					       const u8 *addr,
5119 					       const u8 *localaddr);
5120 
5121 /**
5122  * ieee80211_sta_block_awake - block station from waking up
5123  * @hw: the hardware
5124  * @pubsta: the station
5125  * @block: whether to block or unblock
5126  *
5127  * Some devices require that all frames that are on the queues
5128  * for a specific station that went to sleep are flushed before
5129  * a poll response or frames after the station woke up can be
5130  * delivered to that it. Note that such frames must be rejected
5131  * by the driver as filtered, with the appropriate status flag.
5132  *
5133  * This function allows implementing this mode in a race-free
5134  * manner.
5135  *
5136  * To do this, a driver must keep track of the number of frames
5137  * still enqueued for a specific station. If this number is not
5138  * zero when the station goes to sleep, the driver must call
5139  * this function to force mac80211 to consider the station to
5140  * be asleep regardless of the station's actual state. Once the
5141  * number of outstanding frames reaches zero, the driver must
5142  * call this function again to unblock the station. That will
5143  * cause mac80211 to be able to send ps-poll responses, and if
5144  * the station queried in the meantime then frames will also
5145  * be sent out as a result of this. Additionally, the driver
5146  * will be notified that the station woke up some time after
5147  * it is unblocked, regardless of whether the station actually
5148  * woke up while blocked or not.
5149  */
5150 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
5151 			       struct ieee80211_sta *pubsta, bool block);
5152 
5153 /**
5154  * ieee80211_sta_eosp - notify mac80211 about end of SP
5155  * @pubsta: the station
5156  *
5157  * When a device transmits frames in a way that it can't tell
5158  * mac80211 in the TX status about the EOSP, it must clear the
5159  * %IEEE80211_TX_STATUS_EOSP bit and call this function instead.
5160  * This applies for PS-Poll as well as uAPSD.
5161  *
5162  * Note that just like with _tx_status() and _rx() drivers must
5163  * not mix calls to irqsafe/non-irqsafe versions, this function
5164  * must not be mixed with those either. Use the all irqsafe, or
5165  * all non-irqsafe, don't mix!
5166  *
5167  * NB: the _irqsafe version of this function doesn't exist, no
5168  *     driver needs it right now. Don't call this function if
5169  *     you'd need the _irqsafe version, look at the git history
5170  *     and restore the _irqsafe version!
5171  */
5172 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta);
5173 
5174 /**
5175  * ieee80211_send_eosp_nullfunc - ask mac80211 to send NDP with EOSP
5176  * @pubsta: the station
5177  * @tid: the tid of the NDP
5178  *
5179  * Sometimes the device understands that it needs to close
5180  * the Service Period unexpectedly. This can happen when
5181  * sending frames that are filling holes in the BA window.
5182  * In this case, the device can ask mac80211 to send a
5183  * Nullfunc frame with EOSP set. When that happens, the
5184  * driver must have called ieee80211_sta_set_buffered() to
5185  * let mac80211 know that there are no buffered frames any
5186  * more, otherwise mac80211 will get the more_data bit wrong.
5187  * The low level driver must have made sure that the frame
5188  * will be sent despite the station being in power-save.
5189  * Mac80211 won't call allow_buffered_frames().
5190  * Note that calling this function, doesn't exempt the driver
5191  * from closing the EOSP properly, it will still have to call
5192  * ieee80211_sta_eosp when the NDP is sent.
5193  */
5194 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid);
5195 
5196 /**
5197  * ieee80211_iter_keys - iterate keys programmed into the device
5198  * @hw: pointer obtained from ieee80211_alloc_hw()
5199  * @vif: virtual interface to iterate, may be %NULL for all
5200  * @iter: iterator function that will be called for each key
5201  * @iter_data: custom data to pass to the iterator function
5202  *
5203  * This function can be used to iterate all the keys known to
5204  * mac80211, even those that weren't previously programmed into
5205  * the device. This is intended for use in WoWLAN if the device
5206  * needs reprogramming of the keys during suspend. Note that due
5207  * to locking reasons, it is also only safe to call this at few
5208  * spots since it must hold the RTNL and be able to sleep.
5209  *
5210  * The order in which the keys are iterated matches the order
5211  * in which they were originally installed and handed to the
5212  * set_key callback.
5213  */
5214 void ieee80211_iter_keys(struct ieee80211_hw *hw,
5215 			 struct ieee80211_vif *vif,
5216 			 void (*iter)(struct ieee80211_hw *hw,
5217 				      struct ieee80211_vif *vif,
5218 				      struct ieee80211_sta *sta,
5219 				      struct ieee80211_key_conf *key,
5220 				      void *data),
5221 			 void *iter_data);
5222 
5223 /**
5224  * ieee80211_iter_keys_rcu - iterate keys programmed into the device
5225  * @hw: pointer obtained from ieee80211_alloc_hw()
5226  * @vif: virtual interface to iterate, may be %NULL for all
5227  * @iter: iterator function that will be called for each key
5228  * @iter_data: custom data to pass to the iterator function
5229  *
5230  * This function can be used to iterate all the keys known to
5231  * mac80211, even those that weren't previously programmed into
5232  * the device. Note that due to locking reasons, keys of station
5233  * in removal process will be skipped.
5234  *
5235  * This function requires being called in an RCU critical section,
5236  * and thus iter must be atomic.
5237  */
5238 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
5239 			     struct ieee80211_vif *vif,
5240 			     void (*iter)(struct ieee80211_hw *hw,
5241 					  struct ieee80211_vif *vif,
5242 					  struct ieee80211_sta *sta,
5243 					  struct ieee80211_key_conf *key,
5244 					  void *data),
5245 			     void *iter_data);
5246 
5247 /**
5248  * ieee80211_iter_chan_contexts_atomic - iterate channel contexts
5249  * @hw: pointre obtained from ieee80211_alloc_hw().
5250  * @iter: iterator function
5251  * @iter_data: data passed to iterator function
5252  *
5253  * Iterate all active channel contexts. This function is atomic and
5254  * doesn't acquire any locks internally that might be held in other
5255  * places while calling into the driver.
5256  *
5257  * The iterator will not find a context that's being added (during
5258  * the driver callback to add it) but will find it while it's being
5259  * removed.
5260  *
5261  * Note that during hardware restart, all contexts that existed
5262  * before the restart are considered already present so will be
5263  * found while iterating, whether they've been re-added already
5264  * or not.
5265  */
5266 void ieee80211_iter_chan_contexts_atomic(
5267 	struct ieee80211_hw *hw,
5268 	void (*iter)(struct ieee80211_hw *hw,
5269 		     struct ieee80211_chanctx_conf *chanctx_conf,
5270 		     void *data),
5271 	void *iter_data);
5272 
5273 /**
5274  * ieee80211_ap_probereq_get - retrieve a Probe Request template
5275  * @hw: pointer obtained from ieee80211_alloc_hw().
5276  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5277  *
5278  * Creates a Probe Request template which can, for example, be uploaded to
5279  * hardware. The template is filled with bssid, ssid and supported rate
5280  * information. This function must only be called from within the
5281  * .bss_info_changed callback function and only in managed mode. The function
5282  * is only useful when the interface is associated, otherwise it will return
5283  * %NULL.
5284  *
5285  * Return: The Probe Request template. %NULL on error.
5286  */
5287 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
5288 					  struct ieee80211_vif *vif);
5289 
5290 /**
5291  * ieee80211_beacon_loss - inform hardware does not receive beacons
5292  *
5293  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5294  *
5295  * When beacon filtering is enabled with %IEEE80211_VIF_BEACON_FILTER and
5296  * %IEEE80211_CONF_PS is set, the driver needs to inform whenever the
5297  * hardware is not receiving beacons with this function.
5298  */
5299 void ieee80211_beacon_loss(struct ieee80211_vif *vif);
5300 
5301 /**
5302  * ieee80211_connection_loss - inform hardware has lost connection to the AP
5303  *
5304  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5305  *
5306  * When beacon filtering is enabled with %IEEE80211_VIF_BEACON_FILTER, and
5307  * %IEEE80211_CONF_PS and %IEEE80211_HW_CONNECTION_MONITOR are set, the driver
5308  * needs to inform if the connection to the AP has been lost.
5309  * The function may also be called if the connection needs to be terminated
5310  * for some other reason, even if %IEEE80211_HW_CONNECTION_MONITOR isn't set.
5311  *
5312  * This function will cause immediate change to disassociated state,
5313  * without connection recovery attempts.
5314  */
5315 void ieee80211_connection_loss(struct ieee80211_vif *vif);
5316 
5317 /**
5318  * ieee80211_resume_disconnect - disconnect from AP after resume
5319  *
5320  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5321  *
5322  * Instructs mac80211 to disconnect from the AP after resume.
5323  * Drivers can use this after WoWLAN if they know that the
5324  * connection cannot be kept up, for example because keys were
5325  * used while the device was asleep but the replay counters or
5326  * similar cannot be retrieved from the device during resume.
5327  *
5328  * Note that due to implementation issues, if the driver uses
5329  * the reconfiguration functionality during resume the interface
5330  * will still be added as associated first during resume and then
5331  * disconnect normally later.
5332  *
5333  * This function can only be called from the resume callback and
5334  * the driver must not be holding any of its own locks while it
5335  * calls this function, or at least not any locks it needs in the
5336  * key configuration paths (if it supports HW crypto).
5337  */
5338 void ieee80211_resume_disconnect(struct ieee80211_vif *vif);
5339 
5340 /**
5341  * ieee80211_cqm_rssi_notify - inform a configured connection quality monitoring
5342  *	rssi threshold triggered
5343  *
5344  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5345  * @rssi_event: the RSSI trigger event type
5346  * @rssi_level: new RSSI level value or 0 if not available
5347  * @gfp: context flags
5348  *
5349  * When the %IEEE80211_VIF_SUPPORTS_CQM_RSSI is set, and a connection quality
5350  * monitoring is configured with an rssi threshold, the driver will inform
5351  * whenever the rssi level reaches the threshold.
5352  */
5353 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5354 			       enum nl80211_cqm_rssi_threshold_event rssi_event,
5355 			       s32 rssi_level,
5356 			       gfp_t gfp);
5357 
5358 /**
5359  * ieee80211_cqm_beacon_loss_notify - inform CQM of beacon loss
5360  *
5361  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5362  * @gfp: context flags
5363  */
5364 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp);
5365 
5366 /**
5367  * ieee80211_radar_detected - inform that a radar was detected
5368  *
5369  * @hw: pointer as obtained from ieee80211_alloc_hw()
5370  */
5371 void ieee80211_radar_detected(struct ieee80211_hw *hw);
5372 
5373 /**
5374  * ieee80211_chswitch_done - Complete channel switch process
5375  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5376  * @success: make the channel switch successful or not
5377  *
5378  * Complete the channel switch post-process: set the new operational channel
5379  * and wake up the suspended queues.
5380  */
5381 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success);
5382 
5383 /**
5384  * ieee80211_request_smps - request SM PS transition
5385  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5386  * @smps_mode: new SM PS mode
5387  *
5388  * This allows the driver to request an SM PS transition in managed
5389  * mode. This is useful when the driver has more information than
5390  * the stack about possible interference, for example by bluetooth.
5391  */
5392 void ieee80211_request_smps(struct ieee80211_vif *vif,
5393 			    enum ieee80211_smps_mode smps_mode);
5394 
5395 /**
5396  * ieee80211_ready_on_channel - notification of remain-on-channel start
5397  * @hw: pointer as obtained from ieee80211_alloc_hw()
5398  */
5399 void ieee80211_ready_on_channel(struct ieee80211_hw *hw);
5400 
5401 /**
5402  * ieee80211_remain_on_channel_expired - remain_on_channel duration expired
5403  * @hw: pointer as obtained from ieee80211_alloc_hw()
5404  */
5405 void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw);
5406 
5407 /**
5408  * ieee80211_stop_rx_ba_session - callback to stop existing BA sessions
5409  *
5410  * in order not to harm the system performance and user experience, the device
5411  * may request not to allow any rx ba session and tear down existing rx ba
5412  * sessions based on system constraints such as periodic BT activity that needs
5413  * to limit wlan activity (eg.sco or a2dp)."
5414  * in such cases, the intention is to limit the duration of the rx ppdu and
5415  * therefore prevent the peer device to use a-mpdu aggregation.
5416  *
5417  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5418  * @ba_rx_bitmap: Bit map of open rx ba per tid
5419  * @addr: & to bssid mac address
5420  */
5421 void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
5422 				  const u8 *addr);
5423 
5424 /**
5425  * ieee80211_mark_rx_ba_filtered_frames - move RX BA window and mark filtered
5426  * @pubsta: station struct
5427  * @tid: the session's TID
5428  * @ssn: starting sequence number of the bitmap, all frames before this are
5429  *	assumed to be out of the window after the call
5430  * @filtered: bitmap of filtered frames, BIT(0) is the @ssn entry etc.
5431  * @received_mpdus: number of received mpdus in firmware
5432  *
5433  * This function moves the BA window and releases all frames before @ssn, and
5434  * marks frames marked in the bitmap as having been filtered. Afterwards, it
5435  * checks if any frames in the window starting from @ssn can now be released
5436  * (in case they were only waiting for frames that were filtered.)
5437  */
5438 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
5439 					  u16 ssn, u64 filtered,
5440 					  u16 received_mpdus);
5441 
5442 /**
5443  * ieee80211_send_bar - send a BlockAckReq frame
5444  *
5445  * can be used to flush pending frames from the peer's aggregation reorder
5446  * buffer.
5447  *
5448  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5449  * @ra: the peer's destination address
5450  * @tid: the TID of the aggregation session
5451  * @ssn: the new starting sequence number for the receiver
5452  */
5453 void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn);
5454 
5455 void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, const u8 *addr,
5456 				 unsigned int bit);
5457 
5458 /**
5459  * ieee80211_start_rx_ba_session_offl - start a Rx BA session
5460  *
5461  * Some device drivers may offload part of the Rx aggregation flow including
5462  * AddBa/DelBa negotiation but may otherwise be incapable of full Rx
5463  * reordering.
5464  *
5465  * Create structures responsible for reordering so device drivers may call here
5466  * when they complete AddBa negotiation.
5467  *
5468  * @vif: &struct ieee80211_vif pointer from the add_interface callback
5469  * @addr: station mac address
5470  * @tid: the rx tid
5471  */
5472 static inline void ieee80211_start_rx_ba_session_offl(struct ieee80211_vif *vif,
5473 						      const u8 *addr, u16 tid)
5474 {
5475 	if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
5476 		return;
5477 	ieee80211_manage_rx_ba_offl(vif, addr, tid);
5478 }
5479 
5480 /**
5481  * ieee80211_stop_rx_ba_session_offl - stop a Rx BA session
5482  *
5483  * Some device drivers may offload part of the Rx aggregation flow including
5484  * AddBa/DelBa negotiation but may otherwise be incapable of full Rx
5485  * reordering.
5486  *
5487  * Destroy structures responsible for reordering so device drivers may call here
5488  * when they complete DelBa negotiation.
5489  *
5490  * @vif: &struct ieee80211_vif pointer from the add_interface callback
5491  * @addr: station mac address
5492  * @tid: the rx tid
5493  */
5494 static inline void ieee80211_stop_rx_ba_session_offl(struct ieee80211_vif *vif,
5495 						     const u8 *addr, u16 tid)
5496 {
5497 	if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
5498 		return;
5499 	ieee80211_manage_rx_ba_offl(vif, addr, tid + IEEE80211_NUM_TIDS);
5500 }
5501 
5502 /* Rate control API */
5503 
5504 /**
5505  * struct ieee80211_tx_rate_control - rate control information for/from RC algo
5506  *
5507  * @hw: The hardware the algorithm is invoked for.
5508  * @sband: The band this frame is being transmitted on.
5509  * @bss_conf: the current BSS configuration
5510  * @skb: the skb that will be transmitted, the control information in it needs
5511  *	to be filled in
5512  * @reported_rate: The rate control algorithm can fill this in to indicate
5513  *	which rate should be reported to userspace as the current rate and
5514  *	used for rate calculations in the mesh network.
5515  * @rts: whether RTS will be used for this frame because it is longer than the
5516  *	RTS threshold
5517  * @short_preamble: whether mac80211 will request short-preamble transmission
5518  *	if the selected rate supports it
5519  * @rate_idx_mask: user-requested (legacy) rate mask
5520  * @rate_idx_mcs_mask: user-requested MCS rate mask (NULL if not in use)
5521  * @bss: whether this frame is sent out in AP or IBSS mode
5522  */
5523 struct ieee80211_tx_rate_control {
5524 	struct ieee80211_hw *hw;
5525 	struct ieee80211_supported_band *sband;
5526 	struct ieee80211_bss_conf *bss_conf;
5527 	struct sk_buff *skb;
5528 	struct ieee80211_tx_rate reported_rate;
5529 	bool rts, short_preamble;
5530 	u32 rate_idx_mask;
5531 	u8 *rate_idx_mcs_mask;
5532 	bool bss;
5533 };
5534 
5535 struct rate_control_ops {
5536 	const char *name;
5537 	void *(*alloc)(struct ieee80211_hw *hw, struct dentry *debugfsdir);
5538 	void (*free)(void *priv);
5539 
5540 	void *(*alloc_sta)(void *priv, struct ieee80211_sta *sta, gfp_t gfp);
5541 	void (*rate_init)(void *priv, struct ieee80211_supported_band *sband,
5542 			  struct cfg80211_chan_def *chandef,
5543 			  struct ieee80211_sta *sta, void *priv_sta);
5544 	void (*rate_update)(void *priv, struct ieee80211_supported_band *sband,
5545 			    struct cfg80211_chan_def *chandef,
5546 			    struct ieee80211_sta *sta, void *priv_sta,
5547 			    u32 changed);
5548 	void (*free_sta)(void *priv, struct ieee80211_sta *sta,
5549 			 void *priv_sta);
5550 
5551 	void (*tx_status_ext)(void *priv,
5552 			      struct ieee80211_supported_band *sband,
5553 			      void *priv_sta, struct ieee80211_tx_status *st);
5554 	void (*tx_status)(void *priv, struct ieee80211_supported_band *sband,
5555 			  struct ieee80211_sta *sta, void *priv_sta,
5556 			  struct sk_buff *skb);
5557 	void (*get_rate)(void *priv, struct ieee80211_sta *sta, void *priv_sta,
5558 			 struct ieee80211_tx_rate_control *txrc);
5559 
5560 	void (*add_sta_debugfs)(void *priv, void *priv_sta,
5561 				struct dentry *dir);
5562 	void (*remove_sta_debugfs)(void *priv, void *priv_sta);
5563 
5564 	u32 (*get_expected_throughput)(void *priv_sta);
5565 };
5566 
5567 static inline int rate_supported(struct ieee80211_sta *sta,
5568 				 enum nl80211_band band,
5569 				 int index)
5570 {
5571 	return (sta == NULL || sta->supp_rates[band] & BIT(index));
5572 }
5573 
5574 /**
5575  * rate_control_send_low - helper for drivers for management/no-ack frames
5576  *
5577  * Rate control algorithms that agree to use the lowest rate to
5578  * send management frames and NO_ACK data with the respective hw
5579  * retries should use this in the beginning of their mac80211 get_rate
5580  * callback. If true is returned the rate control can simply return.
5581  * If false is returned we guarantee that sta and sta and priv_sta is
5582  * not null.
5583  *
5584  * Rate control algorithms wishing to do more intelligent selection of
5585  * rate for multicast/broadcast frames may choose to not use this.
5586  *
5587  * @sta: &struct ieee80211_sta pointer to the target destination. Note
5588  * 	that this may be null.
5589  * @priv_sta: private rate control structure. This may be null.
5590  * @txrc: rate control information we sholud populate for mac80211.
5591  */
5592 bool rate_control_send_low(struct ieee80211_sta *sta,
5593 			   void *priv_sta,
5594 			   struct ieee80211_tx_rate_control *txrc);
5595 
5596 
5597 static inline s8
5598 rate_lowest_index(struct ieee80211_supported_band *sband,
5599 		  struct ieee80211_sta *sta)
5600 {
5601 	int i;
5602 
5603 	for (i = 0; i < sband->n_bitrates; i++)
5604 		if (rate_supported(sta, sband->band, i))
5605 			return i;
5606 
5607 	/* warn when we cannot find a rate. */
5608 	WARN_ON_ONCE(1);
5609 
5610 	/* and return 0 (the lowest index) */
5611 	return 0;
5612 }
5613 
5614 static inline
5615 bool rate_usable_index_exists(struct ieee80211_supported_band *sband,
5616 			      struct ieee80211_sta *sta)
5617 {
5618 	unsigned int i;
5619 
5620 	for (i = 0; i < sband->n_bitrates; i++)
5621 		if (rate_supported(sta, sband->band, i))
5622 			return true;
5623 	return false;
5624 }
5625 
5626 /**
5627  * rate_control_set_rates - pass the sta rate selection to mac80211/driver
5628  *
5629  * When not doing a rate control probe to test rates, rate control should pass
5630  * its rate selection to mac80211. If the driver supports receiving a station
5631  * rate table, it will use it to ensure that frames are always sent based on
5632  * the most recent rate control module decision.
5633  *
5634  * @hw: pointer as obtained from ieee80211_alloc_hw()
5635  * @pubsta: &struct ieee80211_sta pointer to the target destination.
5636  * @rates: new tx rate set to be used for this station.
5637  */
5638 int rate_control_set_rates(struct ieee80211_hw *hw,
5639 			   struct ieee80211_sta *pubsta,
5640 			   struct ieee80211_sta_rates *rates);
5641 
5642 int ieee80211_rate_control_register(const struct rate_control_ops *ops);
5643 void ieee80211_rate_control_unregister(const struct rate_control_ops *ops);
5644 
5645 static inline bool
5646 conf_is_ht20(struct ieee80211_conf *conf)
5647 {
5648 	return conf->chandef.width == NL80211_CHAN_WIDTH_20;
5649 }
5650 
5651 static inline bool
5652 conf_is_ht40_minus(struct ieee80211_conf *conf)
5653 {
5654 	return conf->chandef.width == NL80211_CHAN_WIDTH_40 &&
5655 	       conf->chandef.center_freq1 < conf->chandef.chan->center_freq;
5656 }
5657 
5658 static inline bool
5659 conf_is_ht40_plus(struct ieee80211_conf *conf)
5660 {
5661 	return conf->chandef.width == NL80211_CHAN_WIDTH_40 &&
5662 	       conf->chandef.center_freq1 > conf->chandef.chan->center_freq;
5663 }
5664 
5665 static inline bool
5666 conf_is_ht40(struct ieee80211_conf *conf)
5667 {
5668 	return conf->chandef.width == NL80211_CHAN_WIDTH_40;
5669 }
5670 
5671 static inline bool
5672 conf_is_ht(struct ieee80211_conf *conf)
5673 {
5674 	return (conf->chandef.width != NL80211_CHAN_WIDTH_5) &&
5675 		(conf->chandef.width != NL80211_CHAN_WIDTH_10) &&
5676 		(conf->chandef.width != NL80211_CHAN_WIDTH_20_NOHT);
5677 }
5678 
5679 static inline enum nl80211_iftype
5680 ieee80211_iftype_p2p(enum nl80211_iftype type, bool p2p)
5681 {
5682 	if (p2p) {
5683 		switch (type) {
5684 		case NL80211_IFTYPE_STATION:
5685 			return NL80211_IFTYPE_P2P_CLIENT;
5686 		case NL80211_IFTYPE_AP:
5687 			return NL80211_IFTYPE_P2P_GO;
5688 		default:
5689 			break;
5690 		}
5691 	}
5692 	return type;
5693 }
5694 
5695 static inline enum nl80211_iftype
5696 ieee80211_vif_type_p2p(struct ieee80211_vif *vif)
5697 {
5698 	return ieee80211_iftype_p2p(vif->type, vif->p2p);
5699 }
5700 
5701 /**
5702  * ieee80211_update_mu_groups - set the VHT MU-MIMO groud data
5703  *
5704  * @vif: the specified virtual interface
5705  * @membership: 64 bits array - a bit is set if station is member of the group
5706  * @position: 2 bits per group id indicating the position in the group
5707  *
5708  * Note: This function assumes that the given vif is valid and the position and
5709  * membership data is of the correct size and are in the same byte order as the
5710  * matching GroupId management frame.
5711  * Calls to this function need to be serialized with RX path.
5712  */
5713 void ieee80211_update_mu_groups(struct ieee80211_vif *vif,
5714 				const u8 *membership, const u8 *position);
5715 
5716 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
5717 				   int rssi_min_thold,
5718 				   int rssi_max_thold);
5719 
5720 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif);
5721 
5722 /**
5723  * ieee80211_ave_rssi - report the average RSSI for the specified interface
5724  *
5725  * @vif: the specified virtual interface
5726  *
5727  * Note: This function assumes that the given vif is valid.
5728  *
5729  * Return: The average RSSI value for the requested interface, or 0 if not
5730  * applicable.
5731  */
5732 int ieee80211_ave_rssi(struct ieee80211_vif *vif);
5733 
5734 /**
5735  * ieee80211_report_wowlan_wakeup - report WoWLAN wakeup
5736  * @vif: virtual interface
5737  * @wakeup: wakeup reason(s)
5738  * @gfp: allocation flags
5739  *
5740  * See cfg80211_report_wowlan_wakeup().
5741  */
5742 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
5743 				    struct cfg80211_wowlan_wakeup *wakeup,
5744 				    gfp_t gfp);
5745 
5746 /**
5747  * ieee80211_tx_prepare_skb - prepare an 802.11 skb for transmission
5748  * @hw: pointer as obtained from ieee80211_alloc_hw()
5749  * @vif: virtual interface
5750  * @skb: frame to be sent from within the driver
5751  * @band: the band to transmit on
5752  * @sta: optional pointer to get the station to send the frame to
5753  *
5754  * Note: must be called under RCU lock
5755  */
5756 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
5757 			      struct ieee80211_vif *vif, struct sk_buff *skb,
5758 			      int band, struct ieee80211_sta **sta);
5759 
5760 /**
5761  * struct ieee80211_noa_data - holds temporary data for tracking P2P NoA state
5762  *
5763  * @next_tsf: TSF timestamp of the next absent state change
5764  * @has_next_tsf: next absent state change event pending
5765  *
5766  * @absent: descriptor bitmask, set if GO is currently absent
5767  *
5768  * private:
5769  *
5770  * @count: count fields from the NoA descriptors
5771  * @desc: adjusted data from the NoA
5772  */
5773 struct ieee80211_noa_data {
5774 	u32 next_tsf;
5775 	bool has_next_tsf;
5776 
5777 	u8 absent;
5778 
5779 	u8 count[IEEE80211_P2P_NOA_DESC_MAX];
5780 	struct {
5781 		u32 start;
5782 		u32 duration;
5783 		u32 interval;
5784 	} desc[IEEE80211_P2P_NOA_DESC_MAX];
5785 };
5786 
5787 /**
5788  * ieee80211_parse_p2p_noa - initialize NoA tracking data from P2P IE
5789  *
5790  * @attr: P2P NoA IE
5791  * @data: NoA tracking data
5792  * @tsf: current TSF timestamp
5793  *
5794  * Return: number of successfully parsed descriptors
5795  */
5796 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
5797 			    struct ieee80211_noa_data *data, u32 tsf);
5798 
5799 /**
5800  * ieee80211_update_p2p_noa - get next pending P2P GO absent state change
5801  *
5802  * @data: NoA tracking data
5803  * @tsf: current TSF timestamp
5804  */
5805 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf);
5806 
5807 /**
5808  * ieee80211_tdls_oper - request userspace to perform a TDLS operation
5809  * @vif: virtual interface
5810  * @peer: the peer's destination address
5811  * @oper: the requested TDLS operation
5812  * @reason_code: reason code for the operation, valid for TDLS teardown
5813  * @gfp: allocation flags
5814  *
5815  * See cfg80211_tdls_oper_request().
5816  */
5817 void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
5818 				 enum nl80211_tdls_operation oper,
5819 				 u16 reason_code, gfp_t gfp);
5820 
5821 /**
5822  * ieee80211_reserve_tid - request to reserve a specific TID
5823  *
5824  * There is sometimes a need (such as in TDLS) for blocking the driver from
5825  * using a specific TID so that the FW can use it for certain operations such
5826  * as sending PTI requests. To make sure that the driver doesn't use that TID,
5827  * this function must be called as it flushes out packets on this TID and marks
5828  * it as blocked, so that any transmit for the station on this TID will be
5829  * redirected to the alternative TID in the same AC.
5830  *
5831  * Note that this function blocks and may call back into the driver, so it
5832  * should be called without driver locks held. Also note this function should
5833  * only be called from the driver's @sta_state callback.
5834  *
5835  * @sta: the station to reserve the TID for
5836  * @tid: the TID to reserve
5837  *
5838  * Returns: 0 on success, else on failure
5839  */
5840 int ieee80211_reserve_tid(struct ieee80211_sta *sta, u8 tid);
5841 
5842 /**
5843  * ieee80211_unreserve_tid - request to unreserve a specific TID
5844  *
5845  * Once there is no longer any need for reserving a certain TID, this function
5846  * should be called, and no longer will packets have their TID modified for
5847  * preventing use of this TID in the driver.
5848  *
5849  * Note that this function blocks and acquires a lock, so it should be called
5850  * without driver locks held. Also note this function should only be called
5851  * from the driver's @sta_state callback.
5852  *
5853  * @sta: the station
5854  * @tid: the TID to unreserve
5855  */
5856 void ieee80211_unreserve_tid(struct ieee80211_sta *sta, u8 tid);
5857 
5858 /**
5859  * ieee80211_tx_dequeue - dequeue a packet from a software tx queue
5860  *
5861  * @hw: pointer as obtained from ieee80211_alloc_hw()
5862  * @txq: pointer obtained from station or virtual interface
5863  *
5864  * Returns the skb if successful, %NULL if no frame was available.
5865  */
5866 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
5867 				     struct ieee80211_txq *txq);
5868 
5869 /**
5870  * ieee80211_txq_get_depth - get pending frame/byte count of given txq
5871  *
5872  * The values are not guaranteed to be coherent with regard to each other, i.e.
5873  * txq state can change half-way of this function and the caller may end up
5874  * with "new" frame_cnt and "old" byte_cnt or vice-versa.
5875  *
5876  * @txq: pointer obtained from station or virtual interface
5877  * @frame_cnt: pointer to store frame count
5878  * @byte_cnt: pointer to store byte count
5879  */
5880 void ieee80211_txq_get_depth(struct ieee80211_txq *txq,
5881 			     unsigned long *frame_cnt,
5882 			     unsigned long *byte_cnt);
5883 
5884 /**
5885  * ieee80211_nan_func_terminated - notify about NAN function termination.
5886  *
5887  * This function is used to notify mac80211 about NAN function termination.
5888  * Note that this function can't be called from hard irq.
5889  *
5890  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5891  * @inst_id: the local instance id
5892  * @reason: termination reason (one of the NL80211_NAN_FUNC_TERM_REASON_*)
5893  * @gfp: allocation flags
5894  */
5895 void ieee80211_nan_func_terminated(struct ieee80211_vif *vif,
5896 				   u8 inst_id,
5897 				   enum nl80211_nan_func_term_reason reason,
5898 				   gfp_t gfp);
5899 
5900 /**
5901  * ieee80211_nan_func_match - notify about NAN function match event.
5902  *
5903  * This function is used to notify mac80211 about NAN function match. The
5904  * cookie inside the match struct will be assigned by mac80211.
5905  * Note that this function can't be called from hard irq.
5906  *
5907  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
5908  * @match: match event information
5909  * @gfp: allocation flags
5910  */
5911 void ieee80211_nan_func_match(struct ieee80211_vif *vif,
5912 			      struct cfg80211_nan_match_params *match,
5913 			      gfp_t gfp);
5914 
5915 #endif /* MAC80211_H */
5916