2 * mac80211 <-> driver interface
4 * Copyright 2002-2005, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
16 #include <linux/kernel.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/wireless.h>
20 #include <linux/device.h>
21 #include <linux/ieee80211.h>
22 #include <net/cfg80211.h>
27 * mac80211 is the Linux stack for 802.11 hardware that implements
28 * only partial functionality in hard- or firmware. This document
29 * defines the interface between mac80211 and low-level hardware
34 * DOC: Calling mac80211 from interrupts
36 * Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be
37 * called in hardware interrupt context. The low-level driver must not call any
38 * other functions in hardware interrupt context. If there is a need for such
39 * call, the low-level driver should first ACK the interrupt and perform the
40 * IEEE 802.11 code call after this, e.g. from a scheduled workqueue or even
43 * NOTE: If the driver opts to use the _irqsafe() functions, it may not also
44 * use the non-IRQ-safe functions!
50 * If you're reading this document and not the header file itself, it will
51 * be incomplete because not all documentation has been converted yet.
57 * As a general rule, when frames are passed between mac80211 and the driver,
58 * they start with the IEEE 802.11 header and include the same octets that are
59 * sent over the air except for the FCS which should be calculated by the
62 * There are, however, various exceptions to this rule for advanced features:
64 * The first exception is for hardware encryption and decryption offload
65 * where the IV/ICV may or may not be generated in hardware.
67 * Secondly, when the hardware handles fragmentation, the frame handed to
68 * the driver from mac80211 is the MSDU, not the MPDU.
70 * Finally, for received frames, the driver is able to indicate that it has
71 * filled a radiotap header and put that in front of the frame; if it does
72 * not do so then mac80211 may add this under certain circumstances.
76 * DOC: mac80211 workqueue
78 * mac80211 provides its own workqueue for drivers and internal mac80211 use.
79 * The workqueue is a single threaded workqueue and can only be accessed by
80 * helpers for sanity checking. Drivers must ensure all work added onto the
81 * mac80211 workqueue should be cancelled on the driver stop() callback.
83 * mac80211 will flushed the workqueue upon interface removal and during
86 * All work performed on the mac80211 workqueue must not acquire the RTNL lock.
91 * enum ieee80211_max_queues - maximum number of queues
93 * @IEEE80211_MAX_QUEUES: Maximum number of regular device queues.
95 enum ieee80211_max_queues {
96 IEEE80211_MAX_QUEUES = 4,
100 * struct ieee80211_tx_queue_params - transmit queue configuration
102 * The information provided in this structure is required for QoS
103 * transmit queue configuration. Cf. IEEE 802.11 7.3.2.29.
105 * @aifs: arbitration interframe space [0..255]
106 * @cw_min: minimum contention window [a value of the form
107 * 2^n-1 in the range 1..32767]
108 * @cw_max: maximum contention window [like @cw_min]
109 * @txop: maximum burst time in units of 32 usecs, 0 meaning disabled
111 struct ieee80211_tx_queue_params {
119 * struct ieee80211_tx_queue_stats - transmit queue statistics
121 * @len: number of packets in queue
122 * @limit: queue length limit
123 * @count: number of frames sent
125 struct ieee80211_tx_queue_stats {
131 struct ieee80211_low_level_stats {
132 unsigned int dot11ACKFailureCount;
133 unsigned int dot11RTSFailureCount;
134 unsigned int dot11FCSErrorCount;
135 unsigned int dot11RTSSuccessCount;
139 * enum ieee80211_bss_change - BSS change notification flags
141 * These flags are used with the bss_info_changed() callback
142 * to indicate which BSS parameter changed.
144 * @BSS_CHANGED_ASSOC: association status changed (associated/disassociated),
145 * also implies a change in the AID.
146 * @BSS_CHANGED_ERP_CTS_PROT: CTS protection changed
147 * @BSS_CHANGED_ERP_PREAMBLE: preamble changed
148 * @BSS_CHANGED_ERP_SLOT: slot timing changed
149 * @BSS_CHANGED_HT: 802.11n parameters changed
150 * @BSS_CHANGED_BASIC_RATES: Basic rateset changed
151 * @BSS_CHANGED_BEACON_INT: Beacon interval changed
152 * @BSS_CHANGED_BSSID: BSSID changed, for whatever
153 * reason (IBSS and managed mode)
154 * @BSS_CHANGED_BEACON: Beacon data changed, retrieve
155 * new beacon (beaconing modes)
156 * @BSS_CHANGED_BEACON_ENABLED: Beaconing should be
157 * enabled/disabled (beaconing modes)
159 enum ieee80211_bss_change {
160 BSS_CHANGED_ASSOC = 1<<0,
161 BSS_CHANGED_ERP_CTS_PROT = 1<<1,
162 BSS_CHANGED_ERP_PREAMBLE = 1<<2,
163 BSS_CHANGED_ERP_SLOT = 1<<3,
164 BSS_CHANGED_HT = 1<<4,
165 BSS_CHANGED_BASIC_RATES = 1<<5,
166 BSS_CHANGED_BEACON_INT = 1<<6,
167 BSS_CHANGED_BSSID = 1<<7,
168 BSS_CHANGED_BEACON = 1<<8,
169 BSS_CHANGED_BEACON_ENABLED = 1<<9,
173 * struct ieee80211_bss_conf - holds the BSS's changing parameters
175 * This structure keeps information about a BSS (and an association
176 * to that BSS) that can change during the lifetime of the BSS.
178 * @assoc: association status
179 * @aid: association ID number, valid only when @assoc is true
180 * @use_cts_prot: use CTS protection
181 * @use_short_preamble: use 802.11b short preamble;
182 * if the hardware cannot handle this it must set the
183 * IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE hardware flag
184 * @use_short_slot: use short slot time (only relevant for ERP);
185 * if the hardware cannot handle this it must set the
186 * IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag
187 * @dtim_period: num of beacons before the next DTIM, for PSM
188 * @timestamp: beacon timestamp
189 * @beacon_int: beacon interval
190 * @assoc_capability: capabilities taken from assoc resp
191 * @basic_rates: bitmap of basic rates, each bit stands for an
192 * index into the rate table configured by the driver in
194 * @bssid: The BSSID for this BSS
195 * @enable_beacon: whether beaconing should be enabled or not
196 * @ht_operation_mode: HT operation mode (like in &struct ieee80211_ht_info).
197 * This field is only valid when the channel type is one of the HT types.
199 struct ieee80211_bss_conf {
201 /* association related data */
204 /* erp related data */
206 bool use_short_preamble;
211 u16 assoc_capability;
214 u16 ht_operation_mode;
218 * enum mac80211_tx_control_flags - flags to describe transmission information/status
220 * These flags are used with the @flags member of &ieee80211_tx_info.
222 * @IEEE80211_TX_CTL_REQ_TX_STATUS: request TX status callback for this frame.
223 * @IEEE80211_TX_CTL_ASSIGN_SEQ: The driver has to assign a sequence
224 * number to this frame, taking care of not overwriting the fragment
225 * number and increasing the sequence number only when the
226 * IEEE80211_TX_CTL_FIRST_FRAGMENT flag is set. mac80211 will properly
227 * assign sequence numbers to QoS-data frames but cannot do so correctly
228 * for non-QoS-data and management frames because beacons need them from
229 * that counter as well and mac80211 cannot guarantee proper sequencing.
230 * If this flag is set, the driver should instruct the hardware to
231 * assign a sequence number to the frame or assign one itself. Cf. IEEE
232 * 802.11-2007 7.1.3.4.1 paragraph 3. This flag will always be set for
233 * beacons and always be clear for frames without a sequence number field.
234 * @IEEE80211_TX_CTL_NO_ACK: tell the low level not to wait for an ack
235 * @IEEE80211_TX_CTL_CLEAR_PS_FILT: clear powersave filter for destination
237 * @IEEE80211_TX_CTL_FIRST_FRAGMENT: this is a first fragment of the frame
238 * @IEEE80211_TX_CTL_SEND_AFTER_DTIM: send this frame after DTIM beacon
239 * @IEEE80211_TX_CTL_AMPDU: this frame should be sent as part of an A-MPDU
240 * @IEEE80211_TX_CTL_INJECTED: Frame was injected, internal to mac80211.
241 * @IEEE80211_TX_STAT_TX_FILTERED: The frame was not transmitted
242 * because the destination STA was in powersave mode. Note that to
243 * avoid race conditions, the filter must be set by the hardware or
244 * firmware upon receiving a frame that indicates that the station
245 * went to sleep (must be done on device to filter frames already on
246 * the queue) and may only be unset after mac80211 gives the OK for
247 * that by setting the IEEE80211_TX_CTL_CLEAR_PS_FILT (see above),
248 * since only then is it guaranteed that no more frames are in the
250 * @IEEE80211_TX_STAT_ACK: Frame was acknowledged
251 * @IEEE80211_TX_STAT_AMPDU: The frame was aggregated, so status
252 * is for the whole aggregation.
253 * @IEEE80211_TX_STAT_AMPDU_NO_BACK: no block ack was returned,
254 * so consider using block ack request (BAR).
255 * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be
256 * set by rate control algorithms to indicate probe rate, will
257 * be cleared for fragmented frames (except on the last fragment)
258 * @IEEE80211_TX_INTFL_RCALGO: mac80211 internal flag, do not test or
259 * set this flag in the driver; indicates that the rate control
260 * algorithm was used and should be notified of TX status
261 * @IEEE80211_TX_INTFL_NEED_TXPROCESSING: completely internal to mac80211,
262 * used to indicate that a pending frame requires TX processing before
263 * it can be sent out.
264 * @IEEE80211_TX_INTFL_RETRIED: completely internal to mac80211,
265 * used to indicate that a frame was already retried due to PS
266 * @IEEE80211_TX_INTFL_DONT_ENCRYPT: completely internal to mac80211,
267 * used to indicate frame should not be encrypted
268 * @IEEE80211_TX_CTL_PSPOLL_RESPONSE: (internal?)
269 * This frame is a response to a PS-poll frame and should be sent
270 * although the station is in powersave mode.
271 * @IEEE80211_TX_CTL_MORE_FRAMES: More frames will be passed to the
272 * transmit function after the current frame, this can be used
273 * by drivers to kick the DMA queue only if unset or when the
276 enum mac80211_tx_control_flags {
277 IEEE80211_TX_CTL_REQ_TX_STATUS = BIT(0),
278 IEEE80211_TX_CTL_ASSIGN_SEQ = BIT(1),
279 IEEE80211_TX_CTL_NO_ACK = BIT(2),
280 IEEE80211_TX_CTL_CLEAR_PS_FILT = BIT(3),
281 IEEE80211_TX_CTL_FIRST_FRAGMENT = BIT(4),
282 IEEE80211_TX_CTL_SEND_AFTER_DTIM = BIT(5),
283 IEEE80211_TX_CTL_AMPDU = BIT(6),
284 IEEE80211_TX_CTL_INJECTED = BIT(7),
285 IEEE80211_TX_STAT_TX_FILTERED = BIT(8),
286 IEEE80211_TX_STAT_ACK = BIT(9),
287 IEEE80211_TX_STAT_AMPDU = BIT(10),
288 IEEE80211_TX_STAT_AMPDU_NO_BACK = BIT(11),
289 IEEE80211_TX_CTL_RATE_CTRL_PROBE = BIT(12),
290 IEEE80211_TX_INTFL_RCALGO = BIT(13),
291 IEEE80211_TX_INTFL_NEED_TXPROCESSING = BIT(14),
292 IEEE80211_TX_INTFL_RETRIED = BIT(15),
293 IEEE80211_TX_INTFL_DONT_ENCRYPT = BIT(16),
294 IEEE80211_TX_CTL_PSPOLL_RESPONSE = BIT(17),
295 IEEE80211_TX_CTL_MORE_FRAMES = BIT(18),
299 * enum mac80211_rate_control_flags - per-rate flags set by the
300 * Rate Control algorithm.
302 * These flags are set by the Rate control algorithm for each rate during tx,
303 * in the @flags member of struct ieee80211_tx_rate.
305 * @IEEE80211_TX_RC_USE_RTS_CTS: Use RTS/CTS exchange for this rate.
306 * @IEEE80211_TX_RC_USE_CTS_PROTECT: CTS-to-self protection is required.
307 * This is set if the current BSS requires ERP protection.
308 * @IEEE80211_TX_RC_USE_SHORT_PREAMBLE: Use short preamble.
309 * @IEEE80211_TX_RC_MCS: HT rate.
310 * @IEEE80211_TX_RC_GREEN_FIELD: Indicates whether this rate should be used in
312 * @IEEE80211_TX_RC_40_MHZ_WIDTH: Indicates if the Channel Width should be 40 MHz.
313 * @IEEE80211_TX_RC_DUP_DATA: The frame should be transmitted on both of the
314 * adjacent 20 MHz channels, if the current channel type is
315 * NL80211_CHAN_HT40MINUS or NL80211_CHAN_HT40PLUS.
316 * @IEEE80211_TX_RC_SHORT_GI: Short Guard interval should be used for this rate.
318 enum mac80211_rate_control_flags {
319 IEEE80211_TX_RC_USE_RTS_CTS = BIT(0),
320 IEEE80211_TX_RC_USE_CTS_PROTECT = BIT(1),
321 IEEE80211_TX_RC_USE_SHORT_PREAMBLE = BIT(2),
323 /* rate index is an MCS rate number instead of an index */
324 IEEE80211_TX_RC_MCS = BIT(3),
325 IEEE80211_TX_RC_GREEN_FIELD = BIT(4),
326 IEEE80211_TX_RC_40_MHZ_WIDTH = BIT(5),
327 IEEE80211_TX_RC_DUP_DATA = BIT(6),
328 IEEE80211_TX_RC_SHORT_GI = BIT(7),
332 /* there are 40 bytes if you don't need the rateset to be kept */
333 #define IEEE80211_TX_INFO_DRIVER_DATA_SIZE 40
335 /* if you do need the rateset, then you have less space */
336 #define IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE 24
338 /* maximum number of rate stages */
339 #define IEEE80211_TX_MAX_RATES 5
342 * struct ieee80211_tx_rate - rate selection/status
344 * @idx: rate index to attempt to send with
345 * @flags: rate control flags (&enum mac80211_rate_control_flags)
346 * @count: number of tries in this rate before going to the next rate
348 * A value of -1 for @idx indicates an invalid rate and, if used
349 * in an array of retry rates, that no more rates should be tried.
351 * When used for transmit status reporting, the driver should
352 * always report the rate along with the flags it used.
354 * &struct ieee80211_tx_info contains an array of these structs
355 * in the control information, and it will be filled by the rate
356 * control algorithm according to what should be sent. For example,
357 * if this array contains, in the format { <idx>, <count> } the
359 * { 3, 2 }, { 2, 2 }, { 1, 4 }, { -1, 0 }, { -1, 0 }
360 * then this means that the frame should be transmitted
361 * up to twice at rate 3, up to twice at rate 2, and up to four
362 * times at rate 1 if it doesn't get acknowledged. Say it gets
363 * acknowledged by the peer after the fifth attempt, the status
364 * information should then contain
365 * { 3, 2 }, { 2, 2 }, { 1, 1 }, { -1, 0 } ...
366 * since it was transmitted twice at rate 3, twice at rate 2
367 * and once at rate 1 after which we received an acknowledgement.
369 struct ieee80211_tx_rate {
373 } __attribute__((packed));
376 * struct ieee80211_tx_info - skb transmit information
378 * This structure is placed in skb->cb for three uses:
379 * (1) mac80211 TX control - mac80211 tells the driver what to do
380 * (2) driver internal use (if applicable)
381 * (3) TX status information - driver tells mac80211 what happened
383 * The TX control's sta pointer is only valid during the ->tx call,
386 * @flags: transmit info flags, defined above
387 * @band: the band to transmit on (use for checking for races)
388 * @antenna_sel_tx: antenna to use, 0 for automatic diversity
389 * @pad: padding, ignore
390 * @control: union for control data
391 * @status: union for status data
392 * @driver_data: array of driver_data pointers
393 * @ampdu_ack_len: number of aggregated frames.
394 * relevant only if IEEE80211_TX_STATUS_AMPDU was set.
395 * @ampdu_ack_map: block ack bit map for the aggregation.
396 * relevant only if IEEE80211_TX_STATUS_AMPDU was set.
397 * @ack_signal: signal strength of the ACK frame
399 struct ieee80211_tx_info {
400 /* common information */
414 struct ieee80211_tx_rate rates[
415 IEEE80211_TX_MAX_RATES];
418 /* only needed before rate control */
419 unsigned long jiffies;
421 /* NB: vif can be NULL for injected frames */
422 struct ieee80211_vif *vif;
423 struct ieee80211_key_conf *hw_key;
424 struct ieee80211_sta *sta;
427 struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];
434 struct ieee80211_tx_rate driver_rates[
435 IEEE80211_TX_MAX_RATES];
436 void *rate_driver_data[
437 IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE / sizeof(void *)];
440 IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *)];
444 static inline struct ieee80211_tx_info *IEEE80211_SKB_CB(struct sk_buff *skb)
446 return (struct ieee80211_tx_info *)skb->cb;
449 static inline struct ieee80211_rx_status *IEEE80211_SKB_RXCB(struct sk_buff *skb)
451 return (struct ieee80211_rx_status *)skb->cb;
455 * ieee80211_tx_info_clear_status - clear TX status
457 * @info: The &struct ieee80211_tx_info to be cleared.
459 * When the driver passes an skb back to mac80211, it must report
460 * a number of things in TX status. This function clears everything
461 * in the TX status but the rate control information (it does clear
462 * the count since you need to fill that in anyway).
464 * NOTE: You can only use this function if you do NOT use
465 * info->driver_data! Use info->rate_driver_data
466 * instead if you need only the less space that allows.
469 ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
473 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
474 offsetof(struct ieee80211_tx_info, control.rates));
475 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
476 offsetof(struct ieee80211_tx_info, driver_rates));
477 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 8);
478 /* clear the rate counts */
479 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++)
480 info->status.rates[i].count = 0;
483 offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
484 memset(&info->status.ampdu_ack_len, 0,
485 sizeof(struct ieee80211_tx_info) -
486 offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
491 * enum mac80211_rx_flags - receive flags
493 * These flags are used with the @flag member of &struct ieee80211_rx_status.
494 * @RX_FLAG_MMIC_ERROR: Michael MIC error was reported on this frame.
495 * Use together with %RX_FLAG_MMIC_STRIPPED.
496 * @RX_FLAG_DECRYPTED: This frame was decrypted in hardware.
497 * @RX_FLAG_RADIOTAP: This frame starts with a radiotap header.
498 * @RX_FLAG_MMIC_STRIPPED: the Michael MIC is stripped off this frame,
499 * verification has been done by the hardware.
500 * @RX_FLAG_IV_STRIPPED: The IV/ICV are stripped from this frame.
501 * If this flag is set, the stack cannot do any replay detection
502 * hence the driver or hardware will have to do that.
503 * @RX_FLAG_FAILED_FCS_CRC: Set this flag if the FCS check failed on
505 * @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on
507 * @RX_FLAG_TSFT: The timestamp passed in the RX status (@mactime field)
508 * is valid. This is useful in monitor mode and necessary for beacon frames
509 * to enable IBSS merging.
510 * @RX_FLAG_SHORTPRE: Short preamble was used for this frame
511 * @RX_FLAG_HT: HT MCS was used and rate_idx is MCS index
512 * @RX_FLAG_40MHZ: HT40 (40 MHz) was used
513 * @RX_FLAG_SHORT_GI: Short guard interval was used
515 enum mac80211_rx_flags {
516 RX_FLAG_MMIC_ERROR = 1<<0,
517 RX_FLAG_DECRYPTED = 1<<1,
518 RX_FLAG_RADIOTAP = 1<<2,
519 RX_FLAG_MMIC_STRIPPED = 1<<3,
520 RX_FLAG_IV_STRIPPED = 1<<4,
521 RX_FLAG_FAILED_FCS_CRC = 1<<5,
522 RX_FLAG_FAILED_PLCP_CRC = 1<<6,
524 RX_FLAG_SHORTPRE = 1<<8,
526 RX_FLAG_40MHZ = 1<<10,
527 RX_FLAG_SHORT_GI = 1<<11,
531 * struct ieee80211_rx_status - receive status
533 * The low-level driver should provide this information (the subset
534 * supported by hardware) to the 802.11 code with each received
535 * frame, in the skb's control buffer (cb).
537 * @mactime: value in microseconds of the 64-bit Time Synchronization Function
538 * (TSF) timer when the first data symbol (MPDU) arrived at the hardware.
539 * @band: the active band when this frame was received
540 * @freq: frequency the radio was tuned to when receiving this frame, in MHz
541 * @signal: signal strength when receiving this frame, either in dBm, in dB or
542 * unspecified depending on the hardware capabilities flags
543 * @IEEE80211_HW_SIGNAL_*
544 * @noise: noise when receiving this frame, in dBm.
545 * @qual: overall signal quality indication, in percent (0-100).
546 * @antenna: antenna used
547 * @rate_idx: index of data rate into band's supported rates or MCS index if
548 * HT rates are use (RX_FLAG_HT)
551 struct ieee80211_rx_status {
553 enum ieee80211_band band;
564 * enum ieee80211_conf_flags - configuration flags
566 * Flags to define PHY configuration options
568 * @IEEE80211_CONF_RADIOTAP: add radiotap header at receive time (if supported)
569 * @IEEE80211_CONF_PS: Enable 802.11 power save mode (managed mode only)
570 * @IEEE80211_CONF_IDLE: The device is running, but idle; if the flag is set
571 * the driver should be prepared to handle configuration requests but
572 * may turn the device off as much as possible. Typically, this flag will
573 * be set when an interface is set UP but not associated or scanning, but
574 * it can also be unset in that case when monitor interfaces are active.
576 enum ieee80211_conf_flags {
577 IEEE80211_CONF_RADIOTAP = (1<<0),
578 IEEE80211_CONF_PS = (1<<1),
579 IEEE80211_CONF_IDLE = (1<<2),
584 * enum ieee80211_conf_changed - denotes which configuration changed
586 * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed
587 * @IEEE80211_CONF_CHANGE_RADIOTAP: the radiotap flag changed
588 * @IEEE80211_CONF_CHANGE_PS: the PS flag or dynamic PS timeout changed
589 * @IEEE80211_CONF_CHANGE_POWER: the TX power changed
590 * @IEEE80211_CONF_CHANGE_CHANNEL: the channel/channel_type changed
591 * @IEEE80211_CONF_CHANGE_RETRY_LIMITS: retry limits changed
592 * @IEEE80211_CONF_CHANGE_IDLE: Idle flag changed
594 enum ieee80211_conf_changed {
595 IEEE80211_CONF_CHANGE_LISTEN_INTERVAL = BIT(2),
596 IEEE80211_CONF_CHANGE_RADIOTAP = BIT(3),
597 IEEE80211_CONF_CHANGE_PS = BIT(4),
598 IEEE80211_CONF_CHANGE_POWER = BIT(5),
599 IEEE80211_CONF_CHANGE_CHANNEL = BIT(6),
600 IEEE80211_CONF_CHANGE_RETRY_LIMITS = BIT(7),
601 IEEE80211_CONF_CHANGE_IDLE = BIT(8),
605 * struct ieee80211_conf - configuration of the device
607 * This struct indicates how the driver shall configure the hardware.
609 * @flags: configuration flags defined above
611 * @listen_interval: listen interval in units of beacon interval
612 * @max_sleep_period: the maximum number of beacon intervals to sleep for
613 * before checking the beacon for a TIM bit (managed mode only); this
614 * value will be only achievable between DTIM frames, the hardware
615 * needs to check for the multicast traffic bit in DTIM beacons.
616 * This variable is valid only when the CONF_PS flag is set.
617 * @dynamic_ps_timeout: The dynamic powersave timeout (in ms), see the
618 * powersave documentation below. This variable is valid only when
619 * the CONF_PS flag is set.
621 * @power_level: requested transmit power (in dBm)
623 * @channel: the channel to tune to
624 * @channel_type: the channel (HT) type
626 * @long_frame_max_tx_count: Maximum number of transmissions for a "long" frame
627 * (a frame not RTS protected), called "dot11LongRetryLimit" in 802.11,
628 * but actually means the number of transmissions not the number of retries
629 * @short_frame_max_tx_count: Maximum number of transmissions for a "short"
630 * frame, called "dot11ShortRetryLimit" in 802.11, but actually means the
631 * number of transmissions not the number of retries
633 struct ieee80211_conf {
635 int power_level, dynamic_ps_timeout;
636 int max_sleep_period;
640 u8 long_frame_max_tx_count, short_frame_max_tx_count;
642 struct ieee80211_channel *channel;
643 enum nl80211_channel_type channel_type;
647 * struct ieee80211_vif - per-interface data
649 * Data in this structure is continually present for driver
650 * use during the life of a virtual interface.
652 * @type: type of this virtual interface
653 * @bss_conf: BSS configuration for this interface, either our own
654 * or the BSS we're associated to
655 * @drv_priv: data area for driver use, will always be aligned to
658 struct ieee80211_vif {
659 enum nl80211_iftype type;
660 struct ieee80211_bss_conf bss_conf;
662 u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
665 static inline bool ieee80211_vif_is_mesh(struct ieee80211_vif *vif)
667 #ifdef CONFIG_MAC80211_MESH
668 return vif->type == NL80211_IFTYPE_MESH_POINT;
674 * struct ieee80211_if_init_conf - initial configuration of an interface
676 * @vif: pointer to a driver-use per-interface structure. The pointer
677 * itself is also used for various functions including
678 * ieee80211_beacon_get() and ieee80211_get_buffered_bc().
679 * @type: one of &enum nl80211_iftype constants. Determines the type of
680 * added/removed interface.
681 * @mac_addr: pointer to MAC address of the interface. This pointer is valid
682 * until the interface is removed (i.e. it cannot be used after
683 * remove_interface() callback was called for this interface).
685 * This structure is used in add_interface() and remove_interface()
686 * callbacks of &struct ieee80211_hw.
688 * When you allow multiple interfaces to be added to your PHY, take care
689 * that the hardware can actually handle multiple MAC addresses. However,
690 * also take care that when there's no interface left with mac_addr != %NULL
691 * you remove the MAC address from the device to avoid acknowledging packets
692 * in pure monitor mode.
694 struct ieee80211_if_init_conf {
695 enum nl80211_iftype type;
696 struct ieee80211_vif *vif;
701 * enum ieee80211_key_alg - key algorithm
702 * @ALG_WEP: WEP40 or WEP104
704 * @ALG_CCMP: CCMP (AES)
705 * @ALG_AES_CMAC: AES-128-CMAC
707 enum ieee80211_key_alg {
715 * enum ieee80211_key_flags - key flags
717 * These flags are used for communication about keys between the driver
718 * and mac80211, with the @flags parameter of &struct ieee80211_key_conf.
720 * @IEEE80211_KEY_FLAG_WMM_STA: Set by mac80211, this flag indicates
721 * that the STA this key will be used with could be using QoS.
722 * @IEEE80211_KEY_FLAG_GENERATE_IV: This flag should be set by the
723 * driver to indicate that it requires IV generation for this
725 * @IEEE80211_KEY_FLAG_GENERATE_MMIC: This flag should be set by
726 * the driver for a TKIP key if it requires Michael MIC
727 * generation in software.
728 * @IEEE80211_KEY_FLAG_PAIRWISE: Set by mac80211, this flag indicates
729 * that the key is pairwise rather then a shared key.
730 * @IEEE80211_KEY_FLAG_SW_MGMT: This flag should be set by the driver for a
731 * CCMP key if it requires CCMP encryption of management frames (MFP) to
732 * be done in software.
734 enum ieee80211_key_flags {
735 IEEE80211_KEY_FLAG_WMM_STA = 1<<0,
736 IEEE80211_KEY_FLAG_GENERATE_IV = 1<<1,
737 IEEE80211_KEY_FLAG_GENERATE_MMIC= 1<<2,
738 IEEE80211_KEY_FLAG_PAIRWISE = 1<<3,
739 IEEE80211_KEY_FLAG_SW_MGMT = 1<<4,
743 * struct ieee80211_key_conf - key information
745 * This key information is given by mac80211 to the driver by
746 * the set_key() callback in &struct ieee80211_ops.
748 * @hw_key_idx: To be set by the driver, this is the key index the driver
749 * wants to be given when a frame is transmitted and needs to be
750 * encrypted in hardware.
751 * @alg: The key algorithm.
752 * @flags: key flags, see &enum ieee80211_key_flags.
753 * @keyidx: the key index (0-3)
754 * @keylen: key material length
755 * @key: key material. For ALG_TKIP the key is encoded as a 256-bit (32 byte)
757 * - Temporal Encryption Key (128 bits)
758 * - Temporal Authenticator Tx MIC Key (64 bits)
759 * - Temporal Authenticator Rx MIC Key (64 bits)
760 * @icv_len: The ICV length for this key type
761 * @iv_len: The IV length for this key type
763 struct ieee80211_key_conf {
764 enum ieee80211_key_alg alg;
775 * enum set_key_cmd - key command
777 * Used with the set_key() callback in &struct ieee80211_ops, this
778 * indicates whether a key is being removed or added.
780 * @SET_KEY: a key is set
781 * @DISABLE_KEY: a key must be disabled
784 SET_KEY, DISABLE_KEY,
788 * struct ieee80211_sta - station table entry
790 * A station table entry represents a station we are possibly
791 * communicating with. Since stations are RCU-managed in
792 * mac80211, any ieee80211_sta pointer you get access to must
793 * either be protected by rcu_read_lock() explicitly or implicitly,
794 * or you must take good care to not use such a pointer after a
795 * call to your sta_notify callback that removed it.
798 * @aid: AID we assigned to the station if we're an AP
799 * @supp_rates: Bitmap of supported rates (per band)
800 * @ht_cap: HT capabilities of this STA; restricted to our own TX capabilities
801 * @drv_priv: data area for driver use, will always be aligned to
802 * sizeof(void *), size is determined in hw information.
804 struct ieee80211_sta {
805 u32 supp_rates[IEEE80211_NUM_BANDS];
808 struct ieee80211_sta_ht_cap ht_cap;
811 u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
815 * enum sta_notify_cmd - sta notify command
817 * Used with the sta_notify() callback in &struct ieee80211_ops, this
818 * indicates addition and removal of a station to station table,
819 * or if a associated station made a power state transition.
821 * @STA_NOTIFY_ADD: a station was added to the station table
822 * @STA_NOTIFY_REMOVE: a station being removed from the station table
823 * @STA_NOTIFY_SLEEP: a station is now sleeping
824 * @STA_NOTIFY_AWAKE: a sleeping station woke up
826 enum sta_notify_cmd {
827 STA_NOTIFY_ADD, STA_NOTIFY_REMOVE,
828 STA_NOTIFY_SLEEP, STA_NOTIFY_AWAKE,
832 * enum ieee80211_tkip_key_type - get tkip key
834 * Used by drivers which need to get a tkip key for skb. Some drivers need a
835 * phase 1 key, others need a phase 2 key. A single function allows the driver
836 * to get the key, this enum indicates what type of key is required.
838 * @IEEE80211_TKIP_P1_KEY: the driver needs a phase 1 key
839 * @IEEE80211_TKIP_P2_KEY: the driver needs a phase 2 key
841 enum ieee80211_tkip_key_type {
842 IEEE80211_TKIP_P1_KEY,
843 IEEE80211_TKIP_P2_KEY,
847 * enum ieee80211_hw_flags - hardware flags
849 * These flags are used to indicate hardware capabilities to
850 * the stack. Generally, flags here should have their meaning
851 * done in a way that the simplest hardware doesn't need setting
852 * any particular flags. There are some exceptions to this rule,
853 * however, so you are advised to review these flags carefully.
855 * @IEEE80211_HW_RX_INCLUDES_FCS:
856 * Indicates that received frames passed to the stack include
857 * the FCS at the end.
859 * @IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING:
860 * Some wireless LAN chipsets buffer broadcast/multicast frames
861 * for power saving stations in the hardware/firmware and others
862 * rely on the host system for such buffering. This option is used
863 * to configure the IEEE 802.11 upper layer to buffer broadcast and
864 * multicast frames when there are power saving stations so that
865 * the driver can fetch them with ieee80211_get_buffered_bc().
867 * @IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE:
868 * Hardware is not capable of short slot operation on the 2.4 GHz band.
870 * @IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE:
871 * Hardware is not capable of receiving frames with short preamble on
874 * @IEEE80211_HW_SIGNAL_UNSPEC:
875 * Hardware can provide signal values but we don't know its units. We
876 * expect values between 0 and @max_signal.
877 * If possible please provide dB or dBm instead.
879 * @IEEE80211_HW_SIGNAL_DBM:
880 * Hardware gives signal values in dBm, decibel difference from
881 * one milliwatt. This is the preferred method since it is standardized
882 * between different devices. @max_signal does not need to be set.
884 * @IEEE80211_HW_NOISE_DBM:
885 * Hardware can provide noise (radio interference) values in units dBm,
886 * decibel difference from one milliwatt.
888 * @IEEE80211_HW_SPECTRUM_MGMT:
889 * Hardware supports spectrum management defined in 802.11h
890 * Measurement, Channel Switch, Quieting, TPC
892 * @IEEE80211_HW_AMPDU_AGGREGATION:
893 * Hardware supports 11n A-MPDU aggregation.
895 * @IEEE80211_HW_SUPPORTS_PS:
896 * Hardware has power save support (i.e. can go to sleep).
898 * @IEEE80211_HW_PS_NULLFUNC_STACK:
899 * Hardware requires nullfunc frame handling in stack, implies
900 * stack support for dynamic PS.
902 * @IEEE80211_HW_SUPPORTS_DYNAMIC_PS:
903 * Hardware has support for dynamic PS.
905 * @IEEE80211_HW_MFP_CAPABLE:
906 * Hardware supports management frame protection (MFP, IEEE 802.11w).
908 * @IEEE80211_HW_BEACON_FILTER:
909 * Hardware supports dropping of irrelevant beacon frames to
910 * avoid waking up cpu.
911 * @IEEE80211_HW_REPORTS_TX_ACK_STATUS:
912 * Hardware can provide ack status reports of Tx frames to
915 enum ieee80211_hw_flags {
916 IEEE80211_HW_RX_INCLUDES_FCS = 1<<1,
917 IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING = 1<<2,
918 IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE = 1<<3,
919 IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE = 1<<4,
920 IEEE80211_HW_SIGNAL_UNSPEC = 1<<5,
921 IEEE80211_HW_SIGNAL_DBM = 1<<6,
922 IEEE80211_HW_NOISE_DBM = 1<<7,
923 IEEE80211_HW_SPECTRUM_MGMT = 1<<8,
924 IEEE80211_HW_AMPDU_AGGREGATION = 1<<9,
925 IEEE80211_HW_SUPPORTS_PS = 1<<10,
926 IEEE80211_HW_PS_NULLFUNC_STACK = 1<<11,
927 IEEE80211_HW_SUPPORTS_DYNAMIC_PS = 1<<12,
928 IEEE80211_HW_MFP_CAPABLE = 1<<13,
929 IEEE80211_HW_BEACON_FILTER = 1<<14,
930 IEEE80211_HW_REPORTS_TX_ACK_STATUS = 1<<15,
934 * struct ieee80211_hw - hardware information and state
936 * This structure contains the configuration and hardware
937 * information for an 802.11 PHY.
939 * @wiphy: This points to the &struct wiphy allocated for this
940 * 802.11 PHY. You must fill in the @perm_addr and @dev
941 * members of this structure using SET_IEEE80211_DEV()
942 * and SET_IEEE80211_PERM_ADDR(). Additionally, all supported
943 * bands (with channels, bitrates) are registered here.
945 * @conf: &struct ieee80211_conf, device configuration, don't use.
947 * @priv: pointer to private area that was allocated for driver use
948 * along with this structure.
950 * @flags: hardware flags, see &enum ieee80211_hw_flags.
952 * @extra_tx_headroom: headroom to reserve in each transmit skb
953 * for use by the driver (e.g. for transmit headers.)
955 * @channel_change_time: time (in microseconds) it takes to change channels.
957 * @max_signal: Maximum value for signal (rssi) in RX information, used
958 * only when @IEEE80211_HW_SIGNAL_UNSPEC or @IEEE80211_HW_SIGNAL_DB
960 * @max_listen_interval: max listen interval in units of beacon interval
963 * @queues: number of available hardware transmit queues for
964 * data packets. WMM/QoS requires at least four, these
965 * queues need to have configurable access parameters.
967 * @rate_control_algorithm: rate control algorithm for this hardware.
968 * If unset (NULL), the default algorithm will be used. Must be
969 * set before calling ieee80211_register_hw().
971 * @vif_data_size: size (in bytes) of the drv_priv data area
972 * within &struct ieee80211_vif.
973 * @sta_data_size: size (in bytes) of the drv_priv data area
974 * within &struct ieee80211_sta.
976 * @max_rates: maximum number of alternate rate retry stages
977 * @max_rate_tries: maximum number of tries for each stage
979 struct ieee80211_hw {
980 struct ieee80211_conf conf;
982 const char *rate_control_algorithm;
985 unsigned int extra_tx_headroom;
986 int channel_change_time;
990 u16 max_listen_interval;
997 * wiphy_to_ieee80211_hw - return a mac80211 driver hw struct from a wiphy
999 * @wiphy: the &struct wiphy which we want to query
1001 * mac80211 drivers can use this to get to their respective
1002 * &struct ieee80211_hw. Drivers wishing to get to their own private
1003 * structure can then access it via hw->priv. Note that mac802111 drivers should
1004 * not use wiphy_priv() to try to get their private driver structure as this
1005 * is already used internally by mac80211.
1007 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy);
1010 * SET_IEEE80211_DEV - set device for 802.11 hardware
1012 * @hw: the &struct ieee80211_hw to set the device for
1013 * @dev: the &struct device of this 802.11 device
1015 static inline void SET_IEEE80211_DEV(struct ieee80211_hw *hw, struct device *dev)
1017 set_wiphy_dev(hw->wiphy, dev);
1021 * SET_IEEE80211_PERM_ADDR - set the permanent MAC address for 802.11 hardware
1023 * @hw: the &struct ieee80211_hw to set the MAC address for
1024 * @addr: the address to set
1026 static inline void SET_IEEE80211_PERM_ADDR(struct ieee80211_hw *hw, u8 *addr)
1028 memcpy(hw->wiphy->perm_addr, addr, ETH_ALEN);
1031 static inline struct ieee80211_rate *
1032 ieee80211_get_tx_rate(const struct ieee80211_hw *hw,
1033 const struct ieee80211_tx_info *c)
1035 if (WARN_ON(c->control.rates[0].idx < 0))
1037 return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[0].idx];
1040 static inline struct ieee80211_rate *
1041 ieee80211_get_rts_cts_rate(const struct ieee80211_hw *hw,
1042 const struct ieee80211_tx_info *c)
1044 if (c->control.rts_cts_rate_idx < 0)
1046 return &hw->wiphy->bands[c->band]->bitrates[c->control.rts_cts_rate_idx];
1049 static inline struct ieee80211_rate *
1050 ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
1051 const struct ieee80211_tx_info *c, int idx)
1053 if (c->control.rates[idx + 1].idx < 0)
1055 return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[idx + 1].idx];
1059 * DOC: Hardware crypto acceleration
1061 * mac80211 is capable of taking advantage of many hardware
1062 * acceleration designs for encryption and decryption operations.
1064 * The set_key() callback in the &struct ieee80211_ops for a given
1065 * device is called to enable hardware acceleration of encryption and
1066 * decryption. The callback takes a @sta parameter that will be NULL
1067 * for default keys or keys used for transmission only, or point to
1068 * the station information for the peer for individual keys.
1069 * Multiple transmission keys with the same key index may be used when
1070 * VLANs are configured for an access point.
1072 * When transmitting, the TX control data will use the @hw_key_idx
1073 * selected by the driver by modifying the &struct ieee80211_key_conf
1074 * pointed to by the @key parameter to the set_key() function.
1076 * The set_key() call for the %SET_KEY command should return 0 if
1077 * the key is now in use, -%EOPNOTSUPP or -%ENOSPC if it couldn't be
1078 * added; if you return 0 then hw_key_idx must be assigned to the
1079 * hardware key index, you are free to use the full u8 range.
1081 * When the cmd is %DISABLE_KEY then it must succeed.
1083 * Note that it is permissible to not decrypt a frame even if a key
1084 * for it has been uploaded to hardware, the stack will not make any
1085 * decision based on whether a key has been uploaded or not but rather
1086 * based on the receive flags.
1088 * The &struct ieee80211_key_conf structure pointed to by the @key
1089 * parameter is guaranteed to be valid until another call to set_key()
1090 * removes it, but it can only be used as a cookie to differentiate
1093 * In TKIP some HW need to be provided a phase 1 key, for RX decryption
1094 * acceleration (i.e. iwlwifi). Those drivers should provide update_tkip_key
1096 * The update_tkip_key() call updates the driver with the new phase 1 key.
1097 * This happens everytime the iv16 wraps around (every 65536 packets). The
1098 * set_key() call will happen only once for each key (unless the AP did
1099 * rekeying), it will not include a valid phase 1 key. The valid phase 1 key is
1100 * provided by update_tkip_key only. The trigger that makes mac80211 call this
1101 * handler is software decryption with wrap around of iv16.
1105 * DOC: Powersave support
1107 * mac80211 has support for various powersave implementations.
1109 * First, it can support hardware that handles all powersaving by
1110 * itself, such hardware should simply set the %IEEE80211_HW_SUPPORTS_PS
1111 * hardware flag. In that case, it will be told about the desired
1112 * powersave mode depending on the association status, and the driver
1113 * must take care of sending nullfunc frames when necessary, i.e. when
1114 * entering and leaving powersave mode. The driver is required to look at
1115 * the AID in beacons and signal to the AP that it woke up when it finds
1116 * traffic directed to it. This mode supports dynamic PS by simply
1117 * enabling/disabling PS.
1119 * Additionally, such hardware may set the %IEEE80211_HW_SUPPORTS_DYNAMIC_PS
1120 * flag to indicate that it can support dynamic PS mode itself (see below).
1122 * Other hardware designs cannot send nullfunc frames by themselves and also
1123 * need software support for parsing the TIM bitmap. This is also supported
1124 * by mac80211 by combining the %IEEE80211_HW_SUPPORTS_PS and
1125 * %IEEE80211_HW_PS_NULLFUNC_STACK flags. The hardware is of course still
1126 * required to pass up beacons. The hardware is still required to handle
1127 * waking up for multicast traffic; if it cannot the driver must handle that
1128 * as best as it can, mac80211 is too slow.
1130 * Dynamic powersave mode is an extension to normal powersave mode in which
1131 * the hardware stays awake for a user-specified period of time after sending
1132 * a frame so that reply frames need not be buffered and therefore delayed
1133 * to the next wakeup. This can either be supported by hardware, in which case
1134 * the driver needs to look at the @dynamic_ps_timeout hardware configuration
1135 * value, or by the stack if all nullfunc handling is in the stack.
1139 * DOC: Beacon filter support
1141 * Some hardware have beacon filter support to reduce host cpu wakeups
1142 * which will reduce system power consumption. It usuallly works so that
1143 * the firmware creates a checksum of the beacon but omits all constantly
1144 * changing elements (TSF, TIM etc). Whenever the checksum changes the
1145 * beacon is forwarded to the host, otherwise it will be just dropped. That
1146 * way the host will only receive beacons where some relevant information
1147 * (for example ERP protection or WMM settings) have changed.
1149 * Beacon filter support is advertised with the %IEEE80211_HW_BEACON_FILTER
1150 * hardware capability. The driver needs to enable beacon filter support
1151 * whenever power save is enabled, that is %IEEE80211_CONF_PS is set. When
1152 * power save is enabled, the stack will not check for beacon loss and the
1153 * driver needs to notify about loss of beacons with ieee80211_beacon_loss().
1155 * The time (or number of beacons missed) until the firmware notifies the
1156 * driver of a beacon loss event (which in turn causes the driver to call
1157 * ieee80211_beacon_loss()) should be configurable and will be controlled
1158 * by mac80211 and the roaming algorithm in the future.
1160 * Since there may be constantly changing information elements that nothing
1161 * in the software stack cares about, we will, in the future, have mac80211
1162 * tell the driver which information elements are interesting in the sense
1163 * that we want to see changes in them. This will include
1164 * - a list of information element IDs
1165 * - a list of OUIs for the vendor information element
1167 * Ideally, the hardware would filter out any beacons without changes in the
1168 * requested elements, but if it cannot support that it may, at the expense
1169 * of some efficiency, filter out only a subset. For example, if the device
1170 * doesn't support checking for OUIs it should pass up all changes in all
1171 * vendor information elements.
1173 * Note that change, for the sake of simplification, also includes information
1174 * elements appearing or disappearing from the beacon.
1176 * Some hardware supports an "ignore list" instead, just make sure nothing
1177 * that was requested is on the ignore list, and include commonly changing
1178 * information element IDs in the ignore list, for example 11 (BSS load) and
1179 * the various vendor-assigned IEs with unknown contents (128, 129, 133-136,
1180 * 149, 150, 155, 156, 173, 176, 178, 179, 219); for forward compatibility
1181 * it could also include some currently unused IDs.
1184 * In addition to these capabilities, hardware should support notifying the
1185 * host of changes in the beacon RSSI. This is relevant to implement roaming
1186 * when no traffic is flowing (when traffic is flowing we see the RSSI of
1187 * the received data packets). This can consist in notifying the host when
1188 * the RSSI changes significantly or when it drops below or rises above
1189 * configurable thresholds. In the future these thresholds will also be
1190 * configured by mac80211 (which gets them from userspace) to implement
1191 * them as the roaming algorithm requires.
1193 * If the hardware cannot implement this, the driver should ask it to
1194 * periodically pass beacon frames to the host so that software can do the
1195 * signal strength threshold checking.
1199 * DOC: Frame filtering
1201 * mac80211 requires to see many management frames for proper
1202 * operation, and users may want to see many more frames when
1203 * in monitor mode. However, for best CPU usage and power consumption,
1204 * having as few frames as possible percolate through the stack is
1205 * desirable. Hence, the hardware should filter as much as possible.
1207 * To achieve this, mac80211 uses filter flags (see below) to tell
1208 * the driver's configure_filter() function which frames should be
1209 * passed to mac80211 and which should be filtered out.
1211 * Before configure_filter() is invoked, the prepare_multicast()
1212 * callback is invoked with the parameters @mc_count and @mc_list
1213 * for the combined multicast address list of all virtual interfaces.
1214 * It's use is optional, and it returns a u64 that is passed to
1215 * configure_filter(). Additionally, configure_filter() has the
1216 * arguments @changed_flags telling which flags were changed and
1217 * @total_flags with the new flag states.
1219 * If your device has no multicast address filters your driver will
1220 * need to check both the %FIF_ALLMULTI flag and the @mc_count
1221 * parameter to see whether multicast frames should be accepted
1224 * All unsupported flags in @total_flags must be cleared.
1225 * Hardware does not support a flag if it is incapable of _passing_
1226 * the frame to the stack. Otherwise the driver must ignore
1227 * the flag, but not clear it.
1228 * You must _only_ clear the flag (announce no support for the
1229 * flag to mac80211) if you are not able to pass the packet type
1230 * to the stack (so the hardware always filters it).
1231 * So for example, you should clear @FIF_CONTROL, if your hardware
1232 * always filters control frames. If your hardware always passes
1233 * control frames to the kernel and is incapable of filtering them,
1234 * you do _not_ clear the @FIF_CONTROL flag.
1235 * This rule applies to all other FIF flags as well.
1239 * enum ieee80211_filter_flags - hardware filter flags
1241 * These flags determine what the filter in hardware should be
1242 * programmed to let through and what should not be passed to the
1243 * stack. It is always safe to pass more frames than requested,
1244 * but this has negative impact on power consumption.
1246 * @FIF_PROMISC_IN_BSS: promiscuous mode within your BSS,
1247 * think of the BSS as your network segment and then this corresponds
1248 * to the regular ethernet device promiscuous mode.
1250 * @FIF_ALLMULTI: pass all multicast frames, this is used if requested
1251 * by the user or if the hardware is not capable of filtering by
1252 * multicast address.
1254 * @FIF_FCSFAIL: pass frames with failed FCS (but you need to set the
1255 * %RX_FLAG_FAILED_FCS_CRC for them)
1257 * @FIF_PLCPFAIL: pass frames with failed PLCP CRC (but you need to set
1258 * the %RX_FLAG_FAILED_PLCP_CRC for them
1260 * @FIF_BCN_PRBRESP_PROMISC: This flag is set during scanning to indicate
1261 * to the hardware that it should not filter beacons or probe responses
1262 * by BSSID. Filtering them can greatly reduce the amount of processing
1263 * mac80211 needs to do and the amount of CPU wakeups, so you should
1264 * honour this flag if possible.
1266 * @FIF_CONTROL: pass control frames (except for PS Poll), if PROMISC_IN_BSS
1267 * is not set then only those addressed to this station.
1269 * @FIF_OTHER_BSS: pass frames destined to other BSSes
1271 * @FIF_PSPOLL: pass PS Poll frames, if PROMISC_IN_BSS is not set then only
1272 * those addressed to this station.
1274 enum ieee80211_filter_flags {
1275 FIF_PROMISC_IN_BSS = 1<<0,
1276 FIF_ALLMULTI = 1<<1,
1278 FIF_PLCPFAIL = 1<<3,
1279 FIF_BCN_PRBRESP_PROMISC = 1<<4,
1281 FIF_OTHER_BSS = 1<<6,
1286 * enum ieee80211_ampdu_mlme_action - A-MPDU actions
1288 * These flags are used with the ampdu_action() callback in
1289 * &struct ieee80211_ops to indicate which action is needed.
1291 * Note that drivers MUST be able to deal with a TX aggregation
1292 * session being stopped even before they OK'ed starting it by
1293 * calling ieee80211_start_tx_ba_cb(_irqsafe), because the peer
1294 * might receive the addBA frame and send a delBA right away!
1296 * @IEEE80211_AMPDU_RX_START: start Rx aggregation
1297 * @IEEE80211_AMPDU_RX_STOP: stop Rx aggregation
1298 * @IEEE80211_AMPDU_TX_START: start Tx aggregation
1299 * @IEEE80211_AMPDU_TX_STOP: stop Tx aggregation
1300 * @IEEE80211_AMPDU_TX_OPERATIONAL: TX aggregation has become operational
1302 enum ieee80211_ampdu_mlme_action {
1303 IEEE80211_AMPDU_RX_START,
1304 IEEE80211_AMPDU_RX_STOP,
1305 IEEE80211_AMPDU_TX_START,
1306 IEEE80211_AMPDU_TX_STOP,
1307 IEEE80211_AMPDU_TX_OPERATIONAL,
1311 * struct ieee80211_ops - callbacks from mac80211 to the driver
1313 * This structure contains various callbacks that the driver may
1314 * handle or, in some cases, must handle, for example to configure
1315 * the hardware to a new channel or to transmit a frame.
1317 * @tx: Handler that 802.11 module calls for each transmitted frame.
1318 * skb contains the buffer starting from the IEEE 802.11 header.
1319 * The low-level driver should send the frame out based on
1320 * configuration in the TX control data. This handler should,
1321 * preferably, never fail and stop queues appropriately, more
1322 * importantly, however, it must never fail for A-MPDU-queues.
1323 * This function should return NETDEV_TX_OK except in very
1325 * Must be implemented and atomic.
1327 * @start: Called before the first netdevice attached to the hardware
1328 * is enabled. This should turn on the hardware and must turn on
1329 * frame reception (for possibly enabled monitor interfaces.)
1330 * Returns negative error codes, these may be seen in userspace,
1332 * When the device is started it should not have a MAC address
1333 * to avoid acknowledging frames before a non-monitor device
1335 * Must be implemented.
1337 * @stop: Called after last netdevice attached to the hardware
1338 * is disabled. This should turn off the hardware (at least
1339 * it must turn off frame reception.)
1340 * May be called right after add_interface if that rejects
1341 * an interface. If you added any work onto the mac80211 workqueue
1342 * you should ensure to cancel it on this callback.
1343 * Must be implemented.
1345 * @add_interface: Called when a netdevice attached to the hardware is
1346 * enabled. Because it is not called for monitor mode devices, @start
1347 * and @stop must be implemented.
1348 * The driver should perform any initialization it needs before
1349 * the device can be enabled. The initial configuration for the
1350 * interface is given in the conf parameter.
1351 * The callback may refuse to add an interface by returning a
1352 * negative error code (which will be seen in userspace.)
1353 * Must be implemented.
1355 * @remove_interface: Notifies a driver that an interface is going down.
1356 * The @stop callback is called after this if it is the last interface
1357 * and no monitor interfaces are present.
1358 * When all interfaces are removed, the MAC address in the hardware
1359 * must be cleared so the device no longer acknowledges packets,
1360 * the mac_addr member of the conf structure is, however, set to the
1361 * MAC address of the device going away.
1362 * Hence, this callback must be implemented.
1364 * @config: Handler for configuration requests. IEEE 802.11 code calls this
1365 * function to change hardware configuration, e.g., channel.
1366 * This function should never fail but returns a negative error code
1369 * @bss_info_changed: Handler for configuration requests related to BSS
1370 * parameters that may vary during BSS's lifespan, and may affect low
1371 * level driver (e.g. assoc/disassoc status, erp parameters).
1372 * This function should not be used if no BSS has been set, unless
1373 * for association indication. The @changed parameter indicates which
1374 * of the bss parameters has changed when a call is made.
1376 * @prepare_multicast: Prepare for multicast filter configuration.
1377 * This callback is optional, and its return value is passed
1378 * to configure_filter(). This callback must be atomic.
1380 * @configure_filter: Configure the device's RX filter.
1381 * See the section "Frame filtering" for more information.
1382 * This callback must be implemented.
1384 * @set_tim: Set TIM bit. mac80211 calls this function when a TIM bit
1385 * must be set or cleared for a given STA. Must be atomic.
1387 * @set_key: See the section "Hardware crypto acceleration"
1388 * This callback can sleep, and is only called between add_interface
1389 * and remove_interface calls, i.e. while the given virtual interface
1391 * Returns a negative error code if the key can't be added.
1393 * @update_tkip_key: See the section "Hardware crypto acceleration"
1394 * This callback will be called in the context of Rx. Called for drivers
1395 * which set IEEE80211_KEY_FLAG_TKIP_REQ_RX_P1_KEY.
1397 * @hw_scan: Ask the hardware to service the scan request, no need to start
1398 * the scan state machine in stack. The scan must honour the channel
1399 * configuration done by the regulatory agent in the wiphy's
1400 * registered bands. The hardware (or the driver) needs to make sure
1401 * that power save is disabled.
1402 * The @req ie/ie_len members are rewritten by mac80211 to contain the
1403 * entire IEs after the SSID, so that drivers need not look at these
1404 * at all but just send them after the SSID -- mac80211 includes the
1405 * (extended) supported rates and HT information (where applicable).
1406 * When the scan finishes, ieee80211_scan_completed() must be called;
1407 * note that it also must be called when the scan cannot finish due to
1408 * any error unless this callback returned a negative error code.
1410 * @sw_scan_start: Notifier function that is called just before a software scan
1411 * is started. Can be NULL, if the driver doesn't need this notification.
1413 * @sw_scan_complete: Notifier function that is called just after a software scan
1414 * finished. Can be NULL, if the driver doesn't need this notification.
1416 * @get_stats: Return low-level statistics.
1417 * Returns zero if statistics are available.
1419 * @get_tkip_seq: If your device implements TKIP encryption in hardware this
1420 * callback should be provided to read the TKIP transmit IVs (both IV32
1421 * and IV16) for the given key from hardware.
1423 * @set_rts_threshold: Configuration of RTS threshold (if device needs it)
1425 * @sta_notify: Notifies low level driver about addition, removal or power
1426 * state transition of an associated station, AP, IBSS/WDS/mesh peer etc.
1429 * @conf_tx: Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
1430 * bursting) for a hardware TX queue.
1431 * Returns a negative error code on failure.
1433 * @get_tx_stats: Get statistics of the current TX queue status. This is used
1434 * to get number of currently queued packets (queue length), maximum queue
1435 * size (limit), and total number of packets sent using each TX queue
1436 * (count). The 'stats' pointer points to an array that has hw->queues
1439 * @get_tsf: Get the current TSF timer value from firmware/hardware. Currently,
1440 * this is only used for IBSS mode BSSID merging and debugging. Is not a
1441 * required function.
1443 * @set_tsf: Set the TSF timer to the specified value in the firmware/hardware.
1444 * Currently, this is only used for IBSS mode debugging. Is not a
1445 * required function.
1447 * @reset_tsf: Reset the TSF timer and allow firmware/hardware to synchronize
1448 * with other STAs in the IBSS. This is only used in IBSS mode. This
1449 * function is optional if the firmware/hardware takes full care of
1450 * TSF synchronization.
1452 * @tx_last_beacon: Determine whether the last IBSS beacon was sent by us.
1453 * This is needed only for IBSS mode and the result of this function is
1454 * used to determine whether to reply to Probe Requests.
1455 * Returns non-zero if this device sent the last beacon.
1457 * @ampdu_action: Perform a certain A-MPDU action
1458 * The RA/TID combination determines the destination and TID we want
1459 * the ampdu action to be performed for. The action is defined through
1460 * ieee80211_ampdu_mlme_action. Starting sequence number (@ssn)
1461 * is the first frame we expect to perform the action on. Notice
1462 * that TX/RX_STOP can pass NULL for this parameter.
1463 * Returns a negative error code on failure.
1465 * @rfkill_poll: Poll rfkill hardware state. If you need this, you also
1466 * need to set wiphy->rfkill_poll to %true before registration,
1467 * and need to call wiphy_rfkill_set_hw_state() in the callback.
1469 * @testmode_cmd: Implement a cfg80211 test mode command.
1471 struct ieee80211_ops {
1472 int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
1473 int (*start)(struct ieee80211_hw *hw);
1474 void (*stop)(struct ieee80211_hw *hw);
1475 int (*add_interface)(struct ieee80211_hw *hw,
1476 struct ieee80211_if_init_conf *conf);
1477 void (*remove_interface)(struct ieee80211_hw *hw,
1478 struct ieee80211_if_init_conf *conf);
1479 int (*config)(struct ieee80211_hw *hw, u32 changed);
1480 void (*bss_info_changed)(struct ieee80211_hw *hw,
1481 struct ieee80211_vif *vif,
1482 struct ieee80211_bss_conf *info,
1484 u64 (*prepare_multicast)(struct ieee80211_hw *hw,
1485 int mc_count, struct dev_addr_list *mc_list);
1486 void (*configure_filter)(struct ieee80211_hw *hw,
1487 unsigned int changed_flags,
1488 unsigned int *total_flags,
1490 int (*set_tim)(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
1492 int (*set_key)(struct ieee80211_hw *hw, enum set_key_cmd cmd,
1493 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
1494 struct ieee80211_key_conf *key);
1495 void (*update_tkip_key)(struct ieee80211_hw *hw,
1496 struct ieee80211_key_conf *conf, const u8 *address,
1497 u32 iv32, u16 *phase1key);
1498 int (*hw_scan)(struct ieee80211_hw *hw,
1499 struct cfg80211_scan_request *req);
1500 void (*sw_scan_start)(struct ieee80211_hw *hw);
1501 void (*sw_scan_complete)(struct ieee80211_hw *hw);
1502 int (*get_stats)(struct ieee80211_hw *hw,
1503 struct ieee80211_low_level_stats *stats);
1504 void (*get_tkip_seq)(struct ieee80211_hw *hw, u8 hw_key_idx,
1505 u32 *iv32, u16 *iv16);
1506 int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value);
1507 void (*sta_notify)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1508 enum sta_notify_cmd, struct ieee80211_sta *sta);
1509 int (*conf_tx)(struct ieee80211_hw *hw, u16 queue,
1510 const struct ieee80211_tx_queue_params *params);
1511 int (*get_tx_stats)(struct ieee80211_hw *hw,
1512 struct ieee80211_tx_queue_stats *stats);
1513 u64 (*get_tsf)(struct ieee80211_hw *hw);
1514 void (*set_tsf)(struct ieee80211_hw *hw, u64 tsf);
1515 void (*reset_tsf)(struct ieee80211_hw *hw);
1516 int (*tx_last_beacon)(struct ieee80211_hw *hw);
1517 int (*ampdu_action)(struct ieee80211_hw *hw,
1518 enum ieee80211_ampdu_mlme_action action,
1519 struct ieee80211_sta *sta, u16 tid, u16 *ssn);
1521 void (*rfkill_poll)(struct ieee80211_hw *hw);
1522 #ifdef CONFIG_NL80211_TESTMODE
1523 int (*testmode_cmd)(struct ieee80211_hw *hw, void *data, int len);
1528 * ieee80211_alloc_hw - Allocate a new hardware device
1530 * This must be called once for each hardware device. The returned pointer
1531 * must be used to refer to this device when calling other functions.
1532 * mac80211 allocates a private data area for the driver pointed to by
1533 * @priv in &struct ieee80211_hw, the size of this area is given as
1536 * @priv_data_len: length of private data
1537 * @ops: callbacks for this device
1539 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1540 const struct ieee80211_ops *ops);
1543 * ieee80211_register_hw - Register hardware device
1545 * You must call this function before any other functions in
1546 * mac80211. Note that before a hardware can be registered, you
1547 * need to fill the contained wiphy's information.
1549 * @hw: the device to register as returned by ieee80211_alloc_hw()
1551 int ieee80211_register_hw(struct ieee80211_hw *hw);
1553 #ifdef CONFIG_MAC80211_LEDS
1554 extern char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw);
1555 extern char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw);
1556 extern char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw);
1557 extern char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw);
1560 * ieee80211_get_tx_led_name - get name of TX LED
1562 * mac80211 creates a transmit LED trigger for each wireless hardware
1563 * that can be used to drive LEDs if your driver registers a LED device.
1564 * This function returns the name (or %NULL if not configured for LEDs)
1565 * of the trigger so you can automatically link the LED device.
1567 * @hw: the hardware to get the LED trigger name for
1569 static inline char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
1571 #ifdef CONFIG_MAC80211_LEDS
1572 return __ieee80211_get_tx_led_name(hw);
1579 * ieee80211_get_rx_led_name - get name of RX LED
1581 * mac80211 creates a receive LED trigger for each wireless hardware
1582 * that can be used to drive LEDs if your driver registers a LED device.
1583 * This function returns the name (or %NULL if not configured for LEDs)
1584 * of the trigger so you can automatically link the LED device.
1586 * @hw: the hardware to get the LED trigger name for
1588 static inline char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
1590 #ifdef CONFIG_MAC80211_LEDS
1591 return __ieee80211_get_rx_led_name(hw);
1598 * ieee80211_get_assoc_led_name - get name of association LED
1600 * mac80211 creates a association LED trigger for each wireless hardware
1601 * that can be used to drive LEDs if your driver registers a LED device.
1602 * This function returns the name (or %NULL if not configured for LEDs)
1603 * of the trigger so you can automatically link the LED device.
1605 * @hw: the hardware to get the LED trigger name for
1607 static inline char *ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
1609 #ifdef CONFIG_MAC80211_LEDS
1610 return __ieee80211_get_assoc_led_name(hw);
1617 * ieee80211_get_radio_led_name - get name of radio LED
1619 * mac80211 creates a radio change LED trigger for each wireless hardware
1620 * that can be used to drive LEDs if your driver registers a LED device.
1621 * This function returns the name (or %NULL if not configured for LEDs)
1622 * of the trigger so you can automatically link the LED device.
1624 * @hw: the hardware to get the LED trigger name for
1626 static inline char *ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
1628 #ifdef CONFIG_MAC80211_LEDS
1629 return __ieee80211_get_radio_led_name(hw);
1636 * ieee80211_unregister_hw - Unregister a hardware device
1638 * This function instructs mac80211 to free allocated resources
1639 * and unregister netdevices from the networking subsystem.
1641 * @hw: the hardware to unregister
1643 void ieee80211_unregister_hw(struct ieee80211_hw *hw);
1646 * ieee80211_free_hw - free hardware descriptor
1648 * This function frees everything that was allocated, including the
1649 * private data for the driver. You must call ieee80211_unregister_hw()
1650 * before calling this function.
1652 * @hw: the hardware to free
1654 void ieee80211_free_hw(struct ieee80211_hw *hw);
1657 * ieee80211_restart_hw - restart hardware completely
1659 * Call this function when the hardware was restarted for some reason
1660 * (hardware error, ...) and the driver is unable to restore its state
1661 * by itself. mac80211 assumes that at this point the driver/hardware
1662 * is completely uninitialised and stopped, it starts the process by
1663 * calling the ->start() operation. The driver will need to reset all
1664 * internal state that it has prior to calling this function.
1666 * @hw: the hardware to restart
1668 void ieee80211_restart_hw(struct ieee80211_hw *hw);
1671 * ieee80211_rx - receive frame
1673 * Use this function to hand received frames to mac80211. The receive
1674 * buffer in @skb must start with an IEEE 802.11 header or a radiotap
1675 * header if %RX_FLAG_RADIOTAP is set in the @status flags.
1677 * This function may not be called in IRQ context. Calls to this function
1678 * for a single hardware must be synchronized against each other. Calls
1679 * to this function and ieee80211_rx_irqsafe() may not be mixed for a
1682 * Note that right now, this function must be called with softirqs disabled.
1684 * @hw: the hardware this frame came in on
1685 * @skb: the buffer to receive, owned by mac80211 after this call
1687 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb);
1690 * ieee80211_rx_irqsafe - receive frame
1692 * Like ieee80211_rx() but can be called in IRQ context
1693 * (internally defers to a tasklet.)
1695 * Calls to this function and ieee80211_rx() may not be mixed for a
1698 * @hw: the hardware this frame came in on
1699 * @skb: the buffer to receive, owned by mac80211 after this call
1701 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb);
1704 * The TX headroom reserved by mac80211 for its own tx_status functions.
1705 * This is enough for the radiotap header.
1707 #define IEEE80211_TX_STATUS_HEADROOM 13
1710 * ieee80211_tx_status - transmit status callback
1712 * Call this function for all transmitted frames after they have been
1713 * transmitted. It is permissible to not call this function for
1714 * multicast frames but this can affect statistics.
1716 * This function may not be called in IRQ context. Calls to this function
1717 * for a single hardware must be synchronized against each other. Calls
1718 * to this function and ieee80211_tx_status_irqsafe() may not be mixed
1719 * for a single hardware.
1721 * @hw: the hardware the frame was transmitted by
1722 * @skb: the frame that was transmitted, owned by mac80211 after this call
1724 void ieee80211_tx_status(struct ieee80211_hw *hw,
1725 struct sk_buff *skb);
1728 * ieee80211_tx_status_irqsafe - IRQ-safe transmit status callback
1730 * Like ieee80211_tx_status() but can be called in IRQ context
1731 * (internally defers to a tasklet.)
1733 * Calls to this function and ieee80211_tx_status() may not be mixed for a
1736 * @hw: the hardware the frame was transmitted by
1737 * @skb: the frame that was transmitted, owned by mac80211 after this call
1739 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1740 struct sk_buff *skb);
1743 * ieee80211_beacon_get - beacon generation function
1744 * @hw: pointer obtained from ieee80211_alloc_hw().
1745 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1747 * If the beacon frames are generated by the host system (i.e., not in
1748 * hardware/firmware), the low-level driver uses this function to receive
1749 * the next beacon frame from the 802.11 code. The low-level is responsible
1750 * for calling this function before beacon data is needed (e.g., based on
1751 * hardware interrupt). Returned skb is used only once and low-level driver
1752 * is responsible for freeing it.
1754 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1755 struct ieee80211_vif *vif);
1758 * ieee80211_rts_get - RTS frame generation function
1759 * @hw: pointer obtained from ieee80211_alloc_hw().
1760 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1761 * @frame: pointer to the frame that is going to be protected by the RTS.
1762 * @frame_len: the frame length (in octets).
1763 * @frame_txctl: &struct ieee80211_tx_info of the frame.
1764 * @rts: The buffer where to store the RTS frame.
1766 * If the RTS frames are generated by the host system (i.e., not in
1767 * hardware/firmware), the low-level driver uses this function to receive
1768 * the next RTS frame from the 802.11 code. The low-level is responsible
1769 * for calling this function before and RTS frame is needed.
1771 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1772 const void *frame, size_t frame_len,
1773 const struct ieee80211_tx_info *frame_txctl,
1774 struct ieee80211_rts *rts);
1777 * ieee80211_rts_duration - Get the duration field for an RTS frame
1778 * @hw: pointer obtained from ieee80211_alloc_hw().
1779 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1780 * @frame_len: the length of the frame that is going to be protected by the RTS.
1781 * @frame_txctl: &struct ieee80211_tx_info of the frame.
1783 * If the RTS is generated in firmware, but the host system must provide
1784 * the duration field, the low-level driver uses this function to receive
1785 * the duration field value in little-endian byteorder.
1787 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
1788 struct ieee80211_vif *vif, size_t frame_len,
1789 const struct ieee80211_tx_info *frame_txctl);
1792 * ieee80211_ctstoself_get - CTS-to-self frame generation function
1793 * @hw: pointer obtained from ieee80211_alloc_hw().
1794 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1795 * @frame: pointer to the frame that is going to be protected by the CTS-to-self.
1796 * @frame_len: the frame length (in octets).
1797 * @frame_txctl: &struct ieee80211_tx_info of the frame.
1798 * @cts: The buffer where to store the CTS-to-self frame.
1800 * If the CTS-to-self frames are generated by the host system (i.e., not in
1801 * hardware/firmware), the low-level driver uses this function to receive
1802 * the next CTS-to-self frame from the 802.11 code. The low-level is responsible
1803 * for calling this function before and CTS-to-self frame is needed.
1805 void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
1806 struct ieee80211_vif *vif,
1807 const void *frame, size_t frame_len,
1808 const struct ieee80211_tx_info *frame_txctl,
1809 struct ieee80211_cts *cts);
1812 * ieee80211_ctstoself_duration - Get the duration field for a CTS-to-self frame
1813 * @hw: pointer obtained from ieee80211_alloc_hw().
1814 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1815 * @frame_len: the length of the frame that is going to be protected by the CTS-to-self.
1816 * @frame_txctl: &struct ieee80211_tx_info of the frame.
1818 * If the CTS-to-self is generated in firmware, but the host system must provide
1819 * the duration field, the low-level driver uses this function to receive
1820 * the duration field value in little-endian byteorder.
1822 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
1823 struct ieee80211_vif *vif,
1825 const struct ieee80211_tx_info *frame_txctl);
1828 * ieee80211_generic_frame_duration - Calculate the duration field for a frame
1829 * @hw: pointer obtained from ieee80211_alloc_hw().
1830 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1831 * @frame_len: the length of the frame.
1832 * @rate: the rate at which the frame is going to be transmitted.
1834 * Calculate the duration field of some generic frame, given its
1835 * length and transmission rate (in 100kbps).
1837 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
1838 struct ieee80211_vif *vif,
1840 struct ieee80211_rate *rate);
1843 * ieee80211_get_buffered_bc - accessing buffered broadcast and multicast frames
1844 * @hw: pointer as obtained from ieee80211_alloc_hw().
1845 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1847 * Function for accessing buffered broadcast and multicast frames. If
1848 * hardware/firmware does not implement buffering of broadcast/multicast
1849 * frames when power saving is used, 802.11 code buffers them in the host
1850 * memory. The low-level driver uses this function to fetch next buffered
1851 * frame. In most cases, this is used when generating beacon frame. This
1852 * function returns a pointer to the next buffered skb or NULL if no more
1853 * buffered frames are available.
1855 * Note: buffered frames are returned only after DTIM beacon frame was
1856 * generated with ieee80211_beacon_get() and the low-level driver must thus
1857 * call ieee80211_beacon_get() first. ieee80211_get_buffered_bc() returns
1858 * NULL if the previous generated beacon was not DTIM, so the low-level driver
1859 * does not need to check for DTIM beacons separately and should be able to
1860 * use common code for all beacons.
1863 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
1866 * ieee80211_get_tkip_key - get a TKIP rc4 for skb
1868 * This function computes a TKIP rc4 key for an skb. It computes
1869 * a phase 1 key if needed (iv16 wraps around). This function is to
1870 * be used by drivers which can do HW encryption but need to compute
1871 * to phase 1/2 key in SW.
1873 * @keyconf: the parameter passed with the set key
1874 * @skb: the skb for which the key is needed
1876 * @key: a buffer to which the key will be written
1878 void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
1879 struct sk_buff *skb,
1880 enum ieee80211_tkip_key_type type, u8 *key);
1882 * ieee80211_wake_queue - wake specific queue
1883 * @hw: pointer as obtained from ieee80211_alloc_hw().
1884 * @queue: queue number (counted from zero).
1886 * Drivers should use this function instead of netif_wake_queue.
1888 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue);
1891 * ieee80211_stop_queue - stop specific queue
1892 * @hw: pointer as obtained from ieee80211_alloc_hw().
1893 * @queue: queue number (counted from zero).
1895 * Drivers should use this function instead of netif_stop_queue.
1897 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue);
1900 * ieee80211_queue_stopped - test status of the queue
1901 * @hw: pointer as obtained from ieee80211_alloc_hw().
1902 * @queue: queue number (counted from zero).
1904 * Drivers should use this function instead of netif_stop_queue.
1907 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue);
1910 * ieee80211_stop_queues - stop all queues
1911 * @hw: pointer as obtained from ieee80211_alloc_hw().
1913 * Drivers should use this function instead of netif_stop_queue.
1915 void ieee80211_stop_queues(struct ieee80211_hw *hw);
1918 * ieee80211_wake_queues - wake all queues
1919 * @hw: pointer as obtained from ieee80211_alloc_hw().
1921 * Drivers should use this function instead of netif_wake_queue.
1923 void ieee80211_wake_queues(struct ieee80211_hw *hw);
1926 * ieee80211_scan_completed - completed hardware scan
1928 * When hardware scan offload is used (i.e. the hw_scan() callback is
1929 * assigned) this function needs to be called by the driver to notify
1930 * mac80211 that the scan finished.
1932 * @hw: the hardware that finished the scan
1933 * @aborted: set to true if scan was aborted
1935 void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted);
1938 * ieee80211_iterate_active_interfaces - iterate active interfaces
1940 * This function iterates over the interfaces associated with a given
1941 * hardware that are currently active and calls the callback for them.
1942 * This function allows the iterator function to sleep, when the iterator
1943 * function is atomic @ieee80211_iterate_active_interfaces_atomic can
1946 * @hw: the hardware struct of which the interfaces should be iterated over
1947 * @iterator: the iterator function to call
1948 * @data: first argument of the iterator function
1950 void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
1951 void (*iterator)(void *data, u8 *mac,
1952 struct ieee80211_vif *vif),
1956 * ieee80211_iterate_active_interfaces_atomic - iterate active interfaces
1958 * This function iterates over the interfaces associated with a given
1959 * hardware that are currently active and calls the callback for them.
1960 * This function requires the iterator callback function to be atomic,
1961 * if that is not desired, use @ieee80211_iterate_active_interfaces instead.
1963 * @hw: the hardware struct of which the interfaces should be iterated over
1964 * @iterator: the iterator function to call, cannot sleep
1965 * @data: first argument of the iterator function
1967 void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw,
1968 void (*iterator)(void *data,
1970 struct ieee80211_vif *vif),
1974 * ieee80211_queue_work - add work onto the mac80211 workqueue
1976 * Drivers and mac80211 use this to add work onto the mac80211 workqueue.
1977 * This helper ensures drivers are not queueing work when they should not be.
1979 * @hw: the hardware struct for the interface we are adding work for
1980 * @work: the work we want to add onto the mac80211 workqueue
1982 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work);
1985 * ieee80211_queue_delayed_work - add work onto the mac80211 workqueue
1987 * Drivers and mac80211 use this to queue delayed work onto the mac80211
1990 * @hw: the hardware struct for the interface we are adding work for
1991 * @dwork: delayable work to queue onto the mac80211 workqueue
1992 * @delay: number of jiffies to wait before queueing
1994 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
1995 struct delayed_work *dwork,
1996 unsigned long delay);
1999 * ieee80211_start_tx_ba_session - Start a tx Block Ack session.
2000 * @hw: pointer as obtained from ieee80211_alloc_hw().
2001 * @ra: receiver address of the BA session recipient
2002 * @tid: the TID to BA on.
2004 * Return: success if addBA request was sent, failure otherwise
2006 * Although mac80211/low level driver/user space application can estimate
2007 * the need to start aggregation on a certain RA/TID, the session level
2008 * will be managed by the mac80211.
2010 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid);
2013 * ieee80211_start_tx_ba_cb - low level driver ready to aggregate.
2014 * @hw: pointer as obtained from ieee80211_alloc_hw().
2015 * @ra: receiver address of the BA session recipient.
2016 * @tid: the TID to BA on.
2018 * This function must be called by low level driver once it has
2019 * finished with preparations for the BA session.
2021 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid);
2024 * ieee80211_start_tx_ba_cb_irqsafe - low level driver ready to aggregate.
2025 * @hw: pointer as obtained from ieee80211_alloc_hw().
2026 * @ra: receiver address of the BA session recipient.
2027 * @tid: the TID to BA on.
2029 * This function must be called by low level driver once it has
2030 * finished with preparations for the BA session.
2031 * This version of the function is IRQ-safe.
2033 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
2037 * ieee80211_stop_tx_ba_session - Stop a Block Ack session.
2038 * @hw: pointer as obtained from ieee80211_alloc_hw().
2039 * @ra: receiver address of the BA session recipient
2040 * @tid: the TID to stop BA.
2041 * @initiator: if indicates initiator DELBA frame will be sent.
2043 * Return: error if no sta with matching da found, success otherwise
2045 * Although mac80211/low level driver/user space application can estimate
2046 * the need to stop aggregation on a certain RA/TID, the session level
2047 * will be managed by the mac80211.
2049 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
2051 enum ieee80211_back_parties initiator);
2054 * ieee80211_stop_tx_ba_cb - low level driver ready to stop aggregate.
2055 * @hw: pointer as obtained from ieee80211_alloc_hw().
2056 * @ra: receiver address of the BA session recipient.
2057 * @tid: the desired TID to BA on.
2059 * This function must be called by low level driver once it has
2060 * finished with preparations for the BA session tear down.
2062 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid);
2065 * ieee80211_stop_tx_ba_cb_irqsafe - low level driver ready to stop aggregate.
2066 * @hw: pointer as obtained from ieee80211_alloc_hw().
2067 * @ra: receiver address of the BA session recipient.
2068 * @tid: the desired TID to BA on.
2070 * This function must be called by low level driver once it has
2071 * finished with preparations for the BA session tear down.
2072 * This version of the function is IRQ-safe.
2074 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
2078 * ieee80211_find_sta - find a station
2080 * @hw: pointer as obtained from ieee80211_alloc_hw()
2081 * @addr: station's address
2083 * This function must be called under RCU lock and the
2084 * resulting pointer is only valid under RCU lock as well.
2086 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
2090 * ieee80211_beacon_loss - inform hardware does not receive beacons
2092 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
2094 * When beacon filtering is enabled with IEEE80211_HW_BEACON_FILTERING and
2095 * IEEE80211_CONF_PS is set, the driver needs to inform whenever the
2096 * hardware is not receiving beacons with this function.
2098 void ieee80211_beacon_loss(struct ieee80211_vif *vif);
2100 /* Rate control API */
2103 * enum rate_control_changed - flags to indicate which parameter changed
2105 * @IEEE80211_RC_HT_CHANGED: The HT parameters of the operating channel have
2106 * changed, rate control algorithm can update its internal state if needed.
2108 enum rate_control_changed {
2109 IEEE80211_RC_HT_CHANGED = BIT(0)
2113 * struct ieee80211_tx_rate_control - rate control information for/from RC algo
2115 * @hw: The hardware the algorithm is invoked for.
2116 * @sband: The band this frame is being transmitted on.
2117 * @bss_conf: the current BSS configuration
2118 * @reported_rate: The rate control algorithm can fill this in to indicate
2119 * which rate should be reported to userspace as the current rate and
2120 * used for rate calculations in the mesh network.
2121 * @rts: whether RTS will be used for this frame because it is longer than the
2123 * @short_preamble: whether mac80211 will request short-preamble transmission
2124 * if the selected rate supports it
2125 * @max_rate_idx: user-requested maximum rate (not MCS for now)
2126 * @skb: the skb that will be transmitted, the control information in it needs
2129 struct ieee80211_tx_rate_control {
2130 struct ieee80211_hw *hw;
2131 struct ieee80211_supported_band *sband;
2132 struct ieee80211_bss_conf *bss_conf;
2133 struct sk_buff *skb;
2134 struct ieee80211_tx_rate reported_rate;
2135 bool rts, short_preamble;
2139 struct rate_control_ops {
2140 struct module *module;
2142 void *(*alloc)(struct ieee80211_hw *hw, struct dentry *debugfsdir);
2143 void (*free)(void *priv);
2145 void *(*alloc_sta)(void *priv, struct ieee80211_sta *sta, gfp_t gfp);
2146 void (*rate_init)(void *priv, struct ieee80211_supported_band *sband,
2147 struct ieee80211_sta *sta, void *priv_sta);
2148 void (*rate_update)(void *priv, struct ieee80211_supported_band *sband,
2149 struct ieee80211_sta *sta,
2150 void *priv_sta, u32 changed);
2151 void (*free_sta)(void *priv, struct ieee80211_sta *sta,
2154 void (*tx_status)(void *priv, struct ieee80211_supported_band *sband,
2155 struct ieee80211_sta *sta, void *priv_sta,
2156 struct sk_buff *skb);
2157 void (*get_rate)(void *priv, struct ieee80211_sta *sta, void *priv_sta,
2158 struct ieee80211_tx_rate_control *txrc);
2160 void (*add_sta_debugfs)(void *priv, void *priv_sta,
2161 struct dentry *dir);
2162 void (*remove_sta_debugfs)(void *priv, void *priv_sta);
2165 static inline int rate_supported(struct ieee80211_sta *sta,
2166 enum ieee80211_band band,
2169 return (sta == NULL || sta->supp_rates[band] & BIT(index));
2173 * rate_control_send_low - helper for drivers for management/no-ack frames
2175 * Rate control algorithms that agree to use the lowest rate to
2176 * send management frames and NO_ACK data with the respective hw
2177 * retries should use this in the beginning of their mac80211 get_rate
2178 * callback. If true is returned the rate control can simply return.
2179 * If false is returned we guarantee that sta and sta and priv_sta is
2182 * Rate control algorithms wishing to do more intelligent selection of
2183 * rate for multicast/broadcast frames may choose to not use this.
2185 * @sta: &struct ieee80211_sta pointer to the target destination. Note
2186 * that this may be null.
2187 * @priv_sta: private rate control structure. This may be null.
2188 * @txrc: rate control information we sholud populate for mac80211.
2190 bool rate_control_send_low(struct ieee80211_sta *sta,
2192 struct ieee80211_tx_rate_control *txrc);
2196 rate_lowest_index(struct ieee80211_supported_band *sband,
2197 struct ieee80211_sta *sta)
2201 for (i = 0; i < sband->n_bitrates; i++)
2202 if (rate_supported(sta, sband->band, i))
2205 /* warn when we cannot find a rate. */
2212 bool rate_usable_index_exists(struct ieee80211_supported_band *sband,
2213 struct ieee80211_sta *sta)
2217 for (i = 0; i < sband->n_bitrates; i++)
2218 if (rate_supported(sta, sband->band, i))
2223 int ieee80211_rate_control_register(struct rate_control_ops *ops);
2224 void ieee80211_rate_control_unregister(struct rate_control_ops *ops);
2227 conf_is_ht20(struct ieee80211_conf *conf)
2229 return conf->channel_type == NL80211_CHAN_HT20;
2233 conf_is_ht40_minus(struct ieee80211_conf *conf)
2235 return conf->channel_type == NL80211_CHAN_HT40MINUS;
2239 conf_is_ht40_plus(struct ieee80211_conf *conf)
2241 return conf->channel_type == NL80211_CHAN_HT40PLUS;
2245 conf_is_ht40(struct ieee80211_conf *conf)
2247 return conf_is_ht40_minus(conf) || conf_is_ht40_plus(conf);
2251 conf_is_ht(struct ieee80211_conf *conf)
2253 return conf->channel_type != NL80211_CHAN_NO_HT;
2256 #endif /* MAC80211_H */