mac80211.h 156.6 KB
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/*
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 * mac80211 <-> driver interface
 *
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 * Copyright 2002-2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
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 * Copyright 2007-2010	Johannes Berg <johannes@sipsolutions.net>
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef MAC80211_H
#define MAC80211_H

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#include <linux/bug.h>
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#include <linux/kernel.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/ieee80211.h>
#include <net/cfg80211.h>
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#include <asm/unaligned.h>
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/**
 * DOC: Introduction
 *
 * mac80211 is the Linux stack for 802.11 hardware that implements
 * only partial functionality in hard- or firmware. This document
 * defines the interface between mac80211 and low-level hardware
 * drivers.
 */

/**
 * DOC: Calling mac80211 from interrupts
 *
 * Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be
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 * called in hardware interrupt context. The low-level driver must not call any
 * other functions in hardware interrupt context. If there is a need for such
 * call, the low-level driver should first ACK the interrupt and perform the
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 * IEEE 802.11 code call after this, e.g. from a scheduled workqueue or even
 * tasklet function.
 *
 * NOTE: If the driver opts to use the _irqsafe() functions, it may not also
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 *	 use the non-IRQ-safe functions!
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 */

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/**
 * DOC: Warning
 *
 * If you're reading this document and not the header file itself, it will
 * be incomplete because not all documentation has been converted yet.
 */

/**
 * DOC: Frame format
 *
 * As a general rule, when frames are passed between mac80211 and the driver,
 * they start with the IEEE 802.11 header and include the same octets that are
 * sent over the air except for the FCS which should be calculated by the
 * hardware.
 *
 * There are, however, various exceptions to this rule for advanced features:
 *
 * The first exception is for hardware encryption and decryption offload
 * where the IV/ICV may or may not be generated in hardware.
 *
 * Secondly, when the hardware handles fragmentation, the frame handed to
 * the driver from mac80211 is the MSDU, not the MPDU.
 *
 * Finally, for received frames, the driver is able to indicate that it has
 * filled a radiotap header and put that in front of the frame; if it does
 * not do so then mac80211 may add this under certain circumstances.
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 */

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/**
 * DOC: mac80211 workqueue
 *
 * mac80211 provides its own workqueue for drivers and internal mac80211 use.
 * The workqueue is a single threaded workqueue and can only be accessed by
 * helpers for sanity checking. Drivers must ensure all work added onto the
 * mac80211 workqueue should be cancelled on the driver stop() callback.
 *
 * mac80211 will flushed the workqueue upon interface removal and during
 * suspend.
 *
 * All work performed on the mac80211 workqueue must not acquire the RTNL lock.
 *
 */

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struct device;

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/**
 * enum ieee80211_max_queues - maximum number of queues
 *
 * @IEEE80211_MAX_QUEUES: Maximum number of regular device queues.
 */
enum ieee80211_max_queues {
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	IEEE80211_MAX_QUEUES =		16,
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};

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#define IEEE80211_INVAL_HW_QUEUE	0xff

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/**
 * enum ieee80211_ac_numbers - AC numbers as used in mac80211
 * @IEEE80211_AC_VO: voice
 * @IEEE80211_AC_VI: video
 * @IEEE80211_AC_BE: best effort
 * @IEEE80211_AC_BK: background
 */
enum ieee80211_ac_numbers {
	IEEE80211_AC_VO		= 0,
	IEEE80211_AC_VI		= 1,
	IEEE80211_AC_BE		= 2,
	IEEE80211_AC_BK		= 3,
};
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#define IEEE80211_NUM_ACS	4
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/**
 * struct ieee80211_tx_queue_params - transmit queue configuration
 *
 * The information provided in this structure is required for QoS
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 * transmit queue configuration. Cf. IEEE 802.11 7.3.2.29.
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 *
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 * @aifs: arbitration interframe space [0..255]
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 * @cw_min: minimum contention window [a value of the form
 *	2^n-1 in the range 1..32767]
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 * @cw_max: maximum contention window [like @cw_min]
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 * @txop: maximum burst time in units of 32 usecs, 0 meaning disabled
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 * @uapsd: is U-APSD mode enabled for the queue
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 */
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struct ieee80211_tx_queue_params {
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	u16 txop;
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	u16 cw_min;
	u16 cw_max;
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	u8 aifs;
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	bool uapsd;
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};

struct ieee80211_low_level_stats {
	unsigned int dot11ACKFailureCount;
	unsigned int dot11RTSFailureCount;
	unsigned int dot11FCSErrorCount;
	unsigned int dot11RTSSuccessCount;
};

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/**
 * enum ieee80211_chanctx_change - change flag for channel context
 * @IEEE80211_CHANCTX_CHANGE_CHANNEL_TYPE: The channel type was changed
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 * @IEEE80211_CHANCTX_CHANGE_RX_CHAINS: The number of RX chains changed
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 */
enum ieee80211_chanctx_change {
	IEEE80211_CHANCTX_CHANGE_CHANNEL_TYPE	= BIT(0),
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	IEEE80211_CHANCTX_CHANGE_RX_CHAINS	= BIT(1),
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};

/**
 * struct ieee80211_chanctx_conf - channel context that vifs may be tuned to
 *
 * This is the driver-visible part. The ieee80211_chanctx
 * that contains it is visible in mac80211 only.
 *
 * @channel: the channel to tune to
 * @channel_type: the channel (HT) type
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 * @rx_chains_static: The number of RX chains that must always be
 *	active on the channel to receive MIMO transmissions
 * @rx_chains_dynamic: The number of RX chains that must be enabled
 *	after RTS/CTS handshake to receive SMPS MIMO transmissions;
 *	this will always be >= @rx_chains_always.
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 * @drv_priv: data area for driver use, will always be aligned to
 *	sizeof(void *), size is determined in hw information.
 */
struct ieee80211_chanctx_conf {
	struct ieee80211_channel *channel;
	enum nl80211_channel_type channel_type;

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	u8 rx_chains_static, rx_chains_dynamic;

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	u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
};

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/**
 * enum ieee80211_bss_change - BSS change notification flags
 *
 * These flags are used with the bss_info_changed() callback
 * to indicate which BSS parameter changed.
 *
 * @BSS_CHANGED_ASSOC: association status changed (associated/disassociated),
 *	also implies a change in the AID.
 * @BSS_CHANGED_ERP_CTS_PROT: CTS protection changed
 * @BSS_CHANGED_ERP_PREAMBLE: preamble changed
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 * @BSS_CHANGED_ERP_SLOT: slot timing changed
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 * @BSS_CHANGED_HT: 802.11n parameters changed
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 * @BSS_CHANGED_BASIC_RATES: Basic rateset changed
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 * @BSS_CHANGED_BEACON_INT: Beacon interval changed
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 * @BSS_CHANGED_BSSID: BSSID changed, for whatever
 *	reason (IBSS and managed mode)
 * @BSS_CHANGED_BEACON: Beacon data changed, retrieve
 *	new beacon (beaconing modes)
 * @BSS_CHANGED_BEACON_ENABLED: Beaconing should be
 *	enabled/disabled (beaconing modes)
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 * @BSS_CHANGED_CQM: Connection quality monitor config changed
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 * @BSS_CHANGED_IBSS: IBSS join status changed
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 * @BSS_CHANGED_ARP_FILTER: Hardware ARP filter address list or state changed.
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 * @BSS_CHANGED_QOS: QoS for this association was enabled/disabled. Note
 *	that it is only ever disabled for station mode.
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 * @BSS_CHANGED_IDLE: Idle changed for this BSS/interface.
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 * @BSS_CHANGED_SSID: SSID changed for this BSS (AP mode)
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 * @BSS_CHANGED_AP_PROBE_RESP: Probe Response changed for this BSS (AP mode)
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 * @BSS_CHANGED_PS: PS changed for this BSS (STA mode)
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 */
enum ieee80211_bss_change {
	BSS_CHANGED_ASSOC		= 1<<0,
	BSS_CHANGED_ERP_CTS_PROT	= 1<<1,
	BSS_CHANGED_ERP_PREAMBLE	= 1<<2,
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	BSS_CHANGED_ERP_SLOT		= 1<<3,
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	BSS_CHANGED_HT			= 1<<4,
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	BSS_CHANGED_BASIC_RATES		= 1<<5,
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	BSS_CHANGED_BEACON_INT		= 1<<6,
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	BSS_CHANGED_BSSID		= 1<<7,
	BSS_CHANGED_BEACON		= 1<<8,
	BSS_CHANGED_BEACON_ENABLED	= 1<<9,
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	BSS_CHANGED_CQM			= 1<<10,
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	BSS_CHANGED_IBSS		= 1<<11,
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	BSS_CHANGED_ARP_FILTER		= 1<<12,
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	BSS_CHANGED_QOS			= 1<<13,
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	BSS_CHANGED_IDLE		= 1<<14,
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	BSS_CHANGED_SSID		= 1<<15,
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	BSS_CHANGED_AP_PROBE_RESP	= 1<<16,
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	BSS_CHANGED_PS			= 1<<17,
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	/* when adding here, make sure to change ieee80211_reconfig */
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};

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/*
 * The maximum number of IPv4 addresses listed for ARP filtering. If the number
 * of addresses for an interface increase beyond this value, hardware ARP
 * filtering will be disabled.
 */
#define IEEE80211_BSS_ARP_ADDR_LIST_LEN 4

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/**
 * enum ieee80211_rssi_event - RSSI threshold event
 * An indicator for when RSSI goes below/above a certain threshold.
 * @RSSI_EVENT_HIGH: AP's rssi crossed the high threshold set by the driver.
 * @RSSI_EVENT_LOW: AP's rssi crossed the low threshold set by the driver.
 */
enum ieee80211_rssi_event {
	RSSI_EVENT_HIGH,
	RSSI_EVENT_LOW,
};

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/**
 * struct ieee80211_bss_conf - holds the BSS's changing parameters
 *
 * This structure keeps information about a BSS (and an association
 * to that BSS) that can change during the lifetime of the BSS.
 *
 * @assoc: association status
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 * @ibss_joined: indicates whether this station is part of an IBSS
 *	or not
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 * @ibss_creator: indicates if a new IBSS network is being created
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 * @aid: association ID number, valid only when @assoc is true
 * @use_cts_prot: use CTS protection
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 * @use_short_preamble: use 802.11b short preamble;
 *	if the hardware cannot handle this it must set the
 *	IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE hardware flag
 * @use_short_slot: use short slot time (only relevant for ERP);
 *	if the hardware cannot handle this it must set the
 *	IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag
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 * @dtim_period: num of beacons before the next DTIM, for beaconing,
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 *	valid in station mode only while @assoc is true and if also
 *	requested by %IEEE80211_HW_NEED_DTIM_PERIOD (cf. also hw conf
 *	@ps_dtim_period)
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 * @sync_tsf: last beacon's/probe response's TSF timestamp (could be old
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 *	as it may have been received during scanning long ago)
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 * @sync_device_ts: the device timestamp corresponding to the sync_tsf,
 *	the driver/device can use this to calculate synchronisation
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 * @beacon_int: beacon interval
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 * @assoc_capability: capabilities taken from assoc resp
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 * @basic_rates: bitmap of basic rates, each bit stands for an
 *	index into the rate table configured by the driver in
 *	the current band.
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 * @mcast_rate: per-band multicast rate index + 1 (0: disabled)
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 * @bssid: The BSSID for this BSS
 * @enable_beacon: whether beaconing should be enabled or not
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 * @channel_type: Channel type for this BSS -- the hardware might be
 *	configured for HT40+ while this BSS only uses no-HT, for
 *	example.
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 * @ht_operation_mode: HT operation mode like in &struct ieee80211_ht_operation.
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 *	This field is only valid when the channel type is one of the HT types.
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 * @cqm_rssi_thold: Connection quality monitor RSSI threshold, a zero value
 *	implies disabled
 * @cqm_rssi_hyst: Connection quality monitor RSSI hysteresis
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 * @arp_addr_list: List of IPv4 addresses for hardware ARP filtering. The
 *	may filter ARP queries targeted for other addresses than listed here.
 *	The driver must allow ARP queries targeted for all address listed here
 *	to pass through. An empty list implies no ARP queries need to pass.
 * @arp_addr_cnt: Number of addresses currently on the list.
 * @arp_filter_enabled: Enable ARP filtering - if enabled, the hardware may
 *	filter ARP queries based on the @arp_addr_list, if disabled, the
 *	hardware must not perform any ARP filtering. Note, that the filter will
 *	be enabled also in promiscuous mode.
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 * @qos: This is a QoS-enabled BSS.
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 * @idle: This interface is idle. There's also a global idle flag in the
 *	hardware config which may be more appropriate depending on what
 *	your driver/device needs to do.
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 * @ps: power-save mode (STA only). This flag is NOT affected by
 *	offchannel/dynamic_ps operations.
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 * @ssid: The SSID of the current vif. Only valid in AP-mode.
 * @ssid_len: Length of SSID given in @ssid.
 * @hidden_ssid: The SSID of the current vif is hidden. Only valid in AP-mode.
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 */
struct ieee80211_bss_conf {
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	const u8 *bssid;
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	/* association related data */
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	bool assoc, ibss_joined;
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	bool ibss_creator;
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	u16 aid;
	/* erp related data */
	bool use_cts_prot;
	bool use_short_preamble;
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	bool use_short_slot;
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	bool enable_beacon;
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	u8 dtim_period;
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	u16 beacon_int;
	u16 assoc_capability;
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	u64 sync_tsf;
	u32 sync_device_ts;
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	u32 basic_rates;
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	int mcast_rate[IEEE80211_NUM_BANDS];
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	u16 ht_operation_mode;
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	s32 cqm_rssi_thold;
	u32 cqm_rssi_hyst;
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	enum nl80211_channel_type channel_type;
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	__be32 arp_addr_list[IEEE80211_BSS_ARP_ADDR_LIST_LEN];
	u8 arp_addr_cnt;
	bool arp_filter_enabled;
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	bool qos;
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	bool idle;
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	bool ps;
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	u8 ssid[IEEE80211_MAX_SSID_LEN];
	size_t ssid_len;
	bool hidden_ssid;
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};

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/**
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 * enum mac80211_tx_control_flags - flags to describe transmission information/status
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 *
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 * These flags are used with the @flags member of &ieee80211_tx_info.
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 *
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 * @IEEE80211_TX_CTL_REQ_TX_STATUS: require TX status callback for this frame.
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 * @IEEE80211_TX_CTL_ASSIGN_SEQ: The driver has to assign a sequence
 *	number to this frame, taking care of not overwriting the fragment
 *	number and increasing the sequence number only when the
 *	IEEE80211_TX_CTL_FIRST_FRAGMENT flag is set. mac80211 will properly
 *	assign sequence numbers to QoS-data frames but cannot do so correctly
 *	for non-QoS-data and management frames because beacons need them from
 *	that counter as well and mac80211 cannot guarantee proper sequencing.
 *	If this flag is set, the driver should instruct the hardware to
 *	assign a sequence number to the frame or assign one itself. Cf. IEEE
 *	802.11-2007 7.1.3.4.1 paragraph 3. This flag will always be set for
 *	beacons and always be clear for frames without a sequence number field.
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 * @IEEE80211_TX_CTL_NO_ACK: tell the low level not to wait for an ack
 * @IEEE80211_TX_CTL_CLEAR_PS_FILT: clear powersave filter for destination
 *	station
 * @IEEE80211_TX_CTL_FIRST_FRAGMENT: this is a first fragment of the frame
 * @IEEE80211_TX_CTL_SEND_AFTER_DTIM: send this frame after DTIM beacon
 * @IEEE80211_TX_CTL_AMPDU: this frame should be sent as part of an A-MPDU
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 * @IEEE80211_TX_CTL_INJECTED: Frame was injected, internal to mac80211.
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 * @IEEE80211_TX_STAT_TX_FILTERED: The frame was not transmitted
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 *	because the destination STA was in powersave mode. Note that to
 *	avoid race conditions, the filter must be set by the hardware or
 *	firmware upon receiving a frame that indicates that the station
 *	went to sleep (must be done on device to filter frames already on
 *	the queue) and may only be unset after mac80211 gives the OK for
 *	that by setting the IEEE80211_TX_CTL_CLEAR_PS_FILT (see above),
 *	since only then is it guaranteed that no more frames are in the
 *	hardware queue.
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 * @IEEE80211_TX_STAT_ACK: Frame was acknowledged
 * @IEEE80211_TX_STAT_AMPDU: The frame was aggregated, so status
 * 	is for the whole aggregation.
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 * @IEEE80211_TX_STAT_AMPDU_NO_BACK: no block ack was returned,
 * 	so consider using block ack request (BAR).
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 * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be
 *	set by rate control algorithms to indicate probe rate, will
 *	be cleared for fragmented frames (except on the last fragment)
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 * @IEEE80211_TX_INTFL_NEED_TXPROCESSING: completely internal to mac80211,
 *	used to indicate that a pending frame requires TX processing before
 *	it can be sent out.
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 * @IEEE80211_TX_INTFL_RETRIED: completely internal to mac80211,
 *	used to indicate that a frame was already retried due to PS
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 * @IEEE80211_TX_INTFL_DONT_ENCRYPT: completely internal to mac80211,
 *	used to indicate frame should not be encrypted
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 * @IEEE80211_TX_CTL_NO_PS_BUFFER: This frame is a response to a poll
 *	frame (PS-Poll or uAPSD) or a non-bufferable MMPDU and must
 *	be sent although the station is in powersave mode.
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 * @IEEE80211_TX_CTL_MORE_FRAMES: More frames will be passed to the
 *	transmit function after the current frame, this can be used
 *	by drivers to kick the DMA queue only if unset or when the
 *	queue gets full.
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 * @IEEE80211_TX_INTFL_RETRANSMISSION: This frame is being retransmitted
 *	after TX status because the destination was asleep, it must not
 *	be modified again (no seqno assignment, crypto, etc.)
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 * @IEEE80211_TX_INTFL_NL80211_FRAME_TX: Frame was requested through nl80211
 *	MLME command (internal to mac80211 to figure out whether to send TX
 *	status to user space)
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 * @IEEE80211_TX_CTL_LDPC: tells the driver to use LDPC for this frame
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 * @IEEE80211_TX_CTL_STBC: Enables Space-Time Block Coding (STBC) for this
 *	frame and selects the maximum number of streams that it can use.
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 * @IEEE80211_TX_CTL_TX_OFFCHAN: Marks this packet to be transmitted on
 *	the off-channel channel when a remain-on-channel offload is done
 *	in hardware -- normal packets still flow and are expected to be
 *	handled properly by the device.
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 * @IEEE80211_TX_INTFL_TKIP_MIC_FAILURE: Marks this packet to be used for TKIP
 *	testing. It will be sent out with incorrect Michael MIC key to allow
 *	TKIP countermeasures to be tested.
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 * @IEEE80211_TX_CTL_NO_CCK_RATE: This frame will be sent at non CCK rate.
 *	This flag is actually used for management frame especially for P2P
 *	frames not being sent at CCK rate in 2GHz band.
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 * @IEEE80211_TX_STATUS_EOSP: This packet marks the end of service period,
 *	when its status is reported the service period ends. For frames in
 *	an SP that mac80211 transmits, it is already set; for driver frames
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 *	the driver may set this flag. It is also used to do the same for
 *	PS-Poll responses.
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 * @IEEE80211_TX_CTL_USE_MINRATE: This frame will be sent at lowest rate.
 *	This flag is used to send nullfunc frame at minimum rate when
 *	the nullfunc is used for connection monitoring purpose.
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 * @IEEE80211_TX_CTL_DONTFRAG: Don't fragment this packet even if it
 *	would be fragmented by size (this is optional, only used for
 *	monitor injection).
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 *
 * Note: If you have to add new flags to the enumeration, then don't
 *	 forget to update %IEEE80211_TX_TEMPORARY_FLAGS when necessary.
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 */
enum mac80211_tx_control_flags {
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	IEEE80211_TX_CTL_REQ_TX_STATUS		= BIT(0),
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	IEEE80211_TX_CTL_ASSIGN_SEQ		= BIT(1),
	IEEE80211_TX_CTL_NO_ACK			= BIT(2),
	IEEE80211_TX_CTL_CLEAR_PS_FILT		= BIT(3),
	IEEE80211_TX_CTL_FIRST_FRAGMENT		= BIT(4),
	IEEE80211_TX_CTL_SEND_AFTER_DTIM	= BIT(5),
	IEEE80211_TX_CTL_AMPDU			= BIT(6),
	IEEE80211_TX_CTL_INJECTED		= BIT(7),
	IEEE80211_TX_STAT_TX_FILTERED		= BIT(8),
	IEEE80211_TX_STAT_ACK			= BIT(9),
	IEEE80211_TX_STAT_AMPDU			= BIT(10),
	IEEE80211_TX_STAT_AMPDU_NO_BACK		= BIT(11),
	IEEE80211_TX_CTL_RATE_CTRL_PROBE	= BIT(12),
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	IEEE80211_TX_INTFL_NEED_TXPROCESSING	= BIT(14),
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	IEEE80211_TX_INTFL_RETRIED		= BIT(15),
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	IEEE80211_TX_INTFL_DONT_ENCRYPT		= BIT(16),
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	IEEE80211_TX_CTL_NO_PS_BUFFER		= BIT(17),
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	IEEE80211_TX_CTL_MORE_FRAMES		= BIT(18),
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	IEEE80211_TX_INTFL_RETRANSMISSION	= BIT(19),
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	/* hole at 20, use later */
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	IEEE80211_TX_INTFL_NL80211_FRAME_TX	= BIT(21),
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	IEEE80211_TX_CTL_LDPC			= BIT(22),
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	IEEE80211_TX_CTL_STBC			= BIT(23) | BIT(24),
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	IEEE80211_TX_CTL_TX_OFFCHAN		= BIT(25),
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	IEEE80211_TX_INTFL_TKIP_MIC_FAILURE	= BIT(26),
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	IEEE80211_TX_CTL_NO_CCK_RATE		= BIT(27),
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	IEEE80211_TX_STATUS_EOSP		= BIT(28),
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	IEEE80211_TX_CTL_USE_MINRATE		= BIT(29),
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	IEEE80211_TX_CTL_DONTFRAG		= BIT(30),
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};

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#define IEEE80211_TX_CTL_STBC_SHIFT		23

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/*
 * This definition is used as a mask to clear all temporary flags, which are
 * set by the tx handlers for each transmission attempt by the mac80211 stack.
 */
#define IEEE80211_TX_TEMPORARY_FLAGS (IEEE80211_TX_CTL_NO_ACK |		      \
	IEEE80211_TX_CTL_CLEAR_PS_FILT | IEEE80211_TX_CTL_FIRST_FRAGMENT |    \
	IEEE80211_TX_CTL_SEND_AFTER_DTIM | IEEE80211_TX_CTL_AMPDU |	      \
	IEEE80211_TX_STAT_TX_FILTERED |	IEEE80211_TX_STAT_ACK |		      \
	IEEE80211_TX_STAT_AMPDU | IEEE80211_TX_STAT_AMPDU_NO_BACK |	      \
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	IEEE80211_TX_CTL_RATE_CTRL_PROBE | IEEE80211_TX_CTL_NO_PS_BUFFER |    \
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	IEEE80211_TX_CTL_MORE_FRAMES | IEEE80211_TX_CTL_LDPC |		      \
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	IEEE80211_TX_CTL_STBC | IEEE80211_TX_STATUS_EOSP)
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/**
 * enum mac80211_rate_control_flags - per-rate flags set by the
 *	Rate Control algorithm.
 *
 * These flags are set by the Rate control algorithm for each rate during tx,
 * in the @flags member of struct ieee80211_tx_rate.
 *
 * @IEEE80211_TX_RC_USE_RTS_CTS: Use RTS/CTS exchange for this rate.
 * @IEEE80211_TX_RC_USE_CTS_PROTECT: CTS-to-self protection is required.
 *	This is set if the current BSS requires ERP protection.
 * @IEEE80211_TX_RC_USE_SHORT_PREAMBLE: Use short preamble.
 * @IEEE80211_TX_RC_MCS: HT rate.
 * @IEEE80211_TX_RC_GREEN_FIELD: Indicates whether this rate should be used in
 *	Greenfield mode.
 * @IEEE80211_TX_RC_40_MHZ_WIDTH: Indicates if the Channel Width should be 40 MHz.
 * @IEEE80211_TX_RC_DUP_DATA: The frame should be transmitted on both of the
 *	adjacent 20 MHz channels, if the current channel type is
 *	NL80211_CHAN_HT40MINUS or NL80211_CHAN_HT40PLUS.
 * @IEEE80211_TX_RC_SHORT_GI: Short Guard interval should be used for this rate.
 */
502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517
enum mac80211_rate_control_flags {
	IEEE80211_TX_RC_USE_RTS_CTS		= BIT(0),
	IEEE80211_TX_RC_USE_CTS_PROTECT		= BIT(1),
	IEEE80211_TX_RC_USE_SHORT_PREAMBLE	= BIT(2),

	/* rate index is an MCS rate number instead of an index */
	IEEE80211_TX_RC_MCS			= BIT(3),
	IEEE80211_TX_RC_GREEN_FIELD		= BIT(4),
	IEEE80211_TX_RC_40_MHZ_WIDTH		= BIT(5),
	IEEE80211_TX_RC_DUP_DATA		= BIT(6),
	IEEE80211_TX_RC_SHORT_GI		= BIT(7),
};


/* there are 40 bytes if you don't need the rateset to be kept */
#define IEEE80211_TX_INFO_DRIVER_DATA_SIZE 40
518

519 520
/* if you do need the rateset, then you have less space */
#define IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE 24
521

522
/* maximum number of rate stages */
523
#define IEEE80211_TX_MAX_RATES	4
524 525

/**
526
 * struct ieee80211_tx_rate - rate selection/status
527
 *
528 529
 * @idx: rate index to attempt to send with
 * @flags: rate control flags (&enum mac80211_rate_control_flags)
530
 * @count: number of tries in this rate before going to the next rate
531 532 533 534 535 536
 *
 * A value of -1 for @idx indicates an invalid rate and, if used
 * in an array of retry rates, that no more rates should be tried.
 *
 * When used for transmit status reporting, the driver should
 * always report the rate along with the flags it used.
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551
 *
 * &struct ieee80211_tx_info contains an array of these structs
 * in the control information, and it will be filled by the rate
 * control algorithm according to what should be sent. For example,
 * if this array contains, in the format { <idx>, <count> } the
 * information
 *    { 3, 2 }, { 2, 2 }, { 1, 4 }, { -1, 0 }, { -1, 0 }
 * then this means that the frame should be transmitted
 * up to twice at rate 3, up to twice at rate 2, and up to four
 * times at rate 1 if it doesn't get acknowledged. Say it gets
 * acknowledged by the peer after the fifth attempt, the status
 * information should then contain
 *   { 3, 2 }, { 2, 2 }, { 1, 1 }, { -1, 0 } ...
 * since it was transmitted twice at rate 3, twice at rate 2
 * and once at rate 1 after which we received an acknowledgement.
552
 */
553 554 555 556
struct ieee80211_tx_rate {
	s8 idx;
	u8 count;
	u8 flags;
557
} __packed;
558

559 560 561 562 563 564 565 566 567
/**
 * struct ieee80211_tx_info - skb transmit information
 *
 * This structure is placed in skb->cb for three uses:
 *  (1) mac80211 TX control - mac80211 tells the driver what to do
 *  (2) driver internal use (if applicable)
 *  (3) TX status information - driver tells mac80211 what happened
 *
 * @flags: transmit info flags, defined above
568
 * @band: the band to transmit on (use for checking for races)
569
 * @hw_queue: HW queue to put the frame on, skb_get_queue_mapping() gives the AC
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 * @ack_frame_id: internal frame ID for TX status, used internally
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 * @control: union for control data
 * @status: union for status data
 * @driver_data: array of driver_data pointers
574
 * @ampdu_ack_len: number of acked aggregated frames.
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 * 	relevant only if IEEE80211_TX_STAT_AMPDU was set.
576
 * @ampdu_len: number of aggregated frames.
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 * 	relevant only if IEEE80211_TX_STAT_AMPDU was set.
578
 * @ack_signal: signal strength of the ACK frame
579
 */
580 581 582 583
struct ieee80211_tx_info {
	/* common information */
	u32 flags;
	u8 band;
584

585
	u8 hw_queue;
586

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	u16 ack_frame_id;
588 589 590

	union {
		struct {
591 592 593 594 595 596
			union {
				/* rate control */
				struct {
					struct ieee80211_tx_rate rates[
						IEEE80211_TX_MAX_RATES];
					s8 rts_cts_rate_idx;
597
					/* 3 bytes free */
598 599 600 601
				};
				/* only needed before rate control */
				unsigned long jiffies;
			};
602
			/* NB: vif can be NULL for injected frames */
603 604
			struct ieee80211_vif *vif;
			struct ieee80211_key_conf *hw_key;
605
			/* 8 bytes free */
606 607
		} control;
		struct {
608
			struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];
609
			int ack_signal;
610
			u8 ampdu_ack_len;
611
			u8 ampdu_len;
612
			u8 antenna;
613
			/* 21 bytes free */
614
		} status;
615 616 617 618 619 620 621 622
		struct {
			struct ieee80211_tx_rate driver_rates[
				IEEE80211_TX_MAX_RATES];
			void *rate_driver_data[
				IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE / sizeof(void *)];
		};
		void *driver_data[
			IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *)];
623
	};
624 625
};

626
/**
627
 * struct ieee80211_sched_scan_ies - scheduled scan IEs
628 629 630 631 632 633 634 635 636 637 638 639 640
 *
 * This structure is used to pass the appropriate IEs to be used in scheduled
 * scans for all bands.  It contains both the IEs passed from the userspace
 * and the ones generated by mac80211.
 *
 * @ie: array with the IEs for each supported band
 * @len: array with the total length of the IEs for each band
 */
struct ieee80211_sched_scan_ies {
	u8 *ie[IEEE80211_NUM_BANDS];
	size_t len[IEEE80211_NUM_BANDS];
};

641 642 643 644
static inline struct ieee80211_tx_info *IEEE80211_SKB_CB(struct sk_buff *skb)
{
	return (struct ieee80211_tx_info *)skb->cb;
}
645

646 647 648 649 650
static inline struct ieee80211_rx_status *IEEE80211_SKB_RXCB(struct sk_buff *skb)
{
	return (struct ieee80211_rx_status *)skb->cb;
}

651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
/**
 * ieee80211_tx_info_clear_status - clear TX status
 *
 * @info: The &struct ieee80211_tx_info to be cleared.
 *
 * When the driver passes an skb back to mac80211, it must report
 * a number of things in TX status. This function clears everything
 * in the TX status but the rate control information (it does clear
 * the count since you need to fill that in anyway).
 *
 * NOTE: You can only use this function if you do NOT use
 *	 info->driver_data! Use info->rate_driver_data
 *	 instead if you need only the less space that allows.
 */
static inline void
ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
{
	int i;

	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
		     offsetof(struct ieee80211_tx_info, control.rates));
	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
		     offsetof(struct ieee80211_tx_info, driver_rates));
	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 8);
	/* clear the rate counts */
	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++)
		info->status.rates[i].count = 0;

	BUILD_BUG_ON(
680
	    offsetof(struct ieee80211_tx_info, status.ack_signal) != 20);
681 682 683 684 685
	memset(&info->status.ampdu_ack_len, 0,
	       sizeof(struct ieee80211_tx_info) -
	       offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
}

686 687 688 689 690 691 692 693 694 695 696 697 698

/**
 * enum mac80211_rx_flags - receive flags
 *
 * These flags are used with the @flag member of &struct ieee80211_rx_status.
 * @RX_FLAG_MMIC_ERROR: Michael MIC error was reported on this frame.
 *	Use together with %RX_FLAG_MMIC_STRIPPED.
 * @RX_FLAG_DECRYPTED: This frame was decrypted in hardware.
 * @RX_FLAG_MMIC_STRIPPED: the Michael MIC is stripped off this frame,
 *	verification has been done by the hardware.
 * @RX_FLAG_IV_STRIPPED: The IV/ICV are stripped from this frame.
 *	If this flag is set, the stack cannot do any replay detection
 *	hence the driver or hardware will have to do that.
699 700 701 702
 * @RX_FLAG_FAILED_FCS_CRC: Set this flag if the FCS check failed on
 *	the frame.
 * @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on
 *	the frame.
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 * @RX_FLAG_MACTIME_MPDU: The timestamp passed in the RX status (@mactime
 *	field) is valid and contains the time the first symbol of the MPDU
 *	was received. This is useful in monitor mode and for proper IBSS
 *	merging.
707
 * @RX_FLAG_SHORTPRE: Short preamble was used for this frame
708 709 710
 * @RX_FLAG_HT: HT MCS was used and rate_idx is MCS index
 * @RX_FLAG_40MHZ: HT40 (40 MHz) was used
 * @RX_FLAG_SHORT_GI: Short guard interval was used
711 712
 * @RX_FLAG_NO_SIGNAL_VAL: The signal strength value is not present.
 *	Valid only for data frames (mainly A-MPDU)
713 714 715
 * @RX_FLAG_HT_GF: This frame was received in a HT-greenfield transmission, if
 *	the driver fills this value it should add %IEEE80211_RADIOTAP_MCS_HAVE_FMT
 *	to hw.radiotap_mcs_details to advertise that fact
716 717 718 719 720 721 722 723 724 725 726 727 728
 * @RX_FLAG_AMPDU_DETAILS: A-MPDU details are known, in particular the reference
 *	number (@ampdu_reference) must be populated and be a distinct number for
 *	each A-MPDU
 * @RX_FLAG_AMPDU_REPORT_ZEROLEN: driver reports 0-length subframes
 * @RX_FLAG_AMPDU_IS_ZEROLEN: This is a zero-length subframe, for
 *	monitoring purposes only
 * @RX_FLAG_AMPDU_LAST_KNOWN: last subframe is known, should be set on all
 *	subframes of a single A-MPDU
 * @RX_FLAG_AMPDU_IS_LAST: this subframe is the last subframe of the A-MPDU
 * @RX_FLAG_AMPDU_DELIM_CRC_ERROR: A delimiter CRC error has been detected
 *	on this subframe
 * @RX_FLAG_AMPDU_DELIM_CRC_KNOWN: The delimiter CRC field is known (the CRC
 *	is stored in the @ampdu_delimiter_crc field)
729 730
 */
enum mac80211_rx_flags {
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
	RX_FLAG_MMIC_ERROR		= BIT(0),
	RX_FLAG_DECRYPTED		= BIT(1),
	RX_FLAG_MMIC_STRIPPED		= BIT(3),
	RX_FLAG_IV_STRIPPED		= BIT(4),
	RX_FLAG_FAILED_FCS_CRC		= BIT(5),
	RX_FLAG_FAILED_PLCP_CRC 	= BIT(6),
	RX_FLAG_MACTIME_MPDU		= BIT(7),
	RX_FLAG_SHORTPRE		= BIT(8),
	RX_FLAG_HT			= BIT(9),
	RX_FLAG_40MHZ			= BIT(10),
	RX_FLAG_SHORT_GI		= BIT(11),
	RX_FLAG_NO_SIGNAL_VAL		= BIT(12),
	RX_FLAG_HT_GF			= BIT(13),
	RX_FLAG_AMPDU_DETAILS		= BIT(14),
	RX_FLAG_AMPDU_REPORT_ZEROLEN	= BIT(15),
	RX_FLAG_AMPDU_IS_ZEROLEN	= BIT(16),
	RX_FLAG_AMPDU_LAST_KNOWN	= BIT(17),
	RX_FLAG_AMPDU_IS_LAST		= BIT(18),
	RX_FLAG_AMPDU_DELIM_CRC_ERROR	= BIT(19),
	RX_FLAG_AMPDU_DELIM_CRC_KNOWN	= BIT(20),
751 752 753 754 755 756 757
};

/**
 * struct ieee80211_rx_status - receive status
 *
 * The low-level driver should provide this information (the subset
 * supported by hardware) to the 802.11 code with each received
758
 * frame, in the skb's control buffer (cb).
759
 *
760 761
 * @mactime: value in microseconds of the 64-bit Time Synchronization Function
 * 	(TSF) timer when the first data symbol (MPDU) arrived at the hardware.
762 763
 * @device_timestamp: arbitrary timestamp for the device, mac80211 doesn't use
 *	it but can store it and pass it back to the driver for synchronisation
764
 * @band: the active band when this frame was received
765
 * @freq: frequency the radio was tuned to when receiving this frame, in MHz
766 767 768
 * @signal: signal strength when receiving this frame, either in dBm, in dB or
 *	unspecified depending on the hardware capabilities flags
 *	@IEEE80211_HW_SIGNAL_*
769
 * @antenna: antenna used
770 771
 * @rate_idx: index of data rate into band's supported rates or MCS index if
 *	HT rates are use (RX_FLAG_HT)
772
 * @flag: %RX_FLAG_*
773
 * @rx_flags: internal RX flags for mac80211
774 775 776
 * @ampdu_reference: A-MPDU reference number, must be a different value for
 *	each A-MPDU but the same for each subframe within one A-MPDU
 * @ampdu_delimiter_crc: A-MPDU delimiter CRC
777
 */
778 779
struct ieee80211_rx_status {
	u64 mactime;
780
	u32 device_timestamp;
781 782
	u32 ampdu_reference;
	u32 flag;
783 784 785 786 787 788
	u16 freq;
	u8 rate_idx;
	u8 rx_flags;
	u8 band;
	u8 antenna;
	s8 signal;
789
	u8 ampdu_delimiter_crc;
790 791
};

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/**
 * enum ieee80211_conf_flags - configuration flags
 *
 * Flags to define PHY configuration options
 *
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797 798 799
 * @IEEE80211_CONF_MONITOR: there's a monitor interface present -- use this
 *	to determine for example whether to calculate timestamps for packets
 *	or not, do not use instead of filter flags!
800 801 802 803 804 805 806
 * @IEEE80211_CONF_PS: Enable 802.11 power save mode (managed mode only).
 *	This is the power save mode defined by IEEE 802.11-2007 section 11.2,
 *	meaning that the hardware still wakes up for beacons, is able to
 *	transmit frames and receive the possible acknowledgment frames.
 *	Not to be confused with hardware specific wakeup/sleep states,
 *	driver is responsible for that. See the section "Powersave support"
 *	for more.
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 * @IEEE80211_CONF_IDLE: The device is running, but idle; if the flag is set
 *	the driver should be prepared to handle configuration requests but
 *	may turn the device off as much as possible. Typically, this flag will
 *	be set when an interface is set UP but not associated or scanning, but
 *	it can also be unset in that case when monitor interfaces are active.
812 813
 * @IEEE80211_CONF_OFFCHANNEL: The device is currently not on its main
 *	operating channel.
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 */
enum ieee80211_conf_flags {
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816
	IEEE80211_CONF_MONITOR		= (1<<0),
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817
	IEEE80211_CONF_PS		= (1<<1),
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818
	IEEE80211_CONF_IDLE		= (1<<2),
819
	IEEE80211_CONF_OFFCHANNEL	= (1<<3),
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};
821

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823 824 825 826
/**
 * enum ieee80211_conf_changed - denotes which configuration changed
 *
 * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed
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 * @IEEE80211_CONF_CHANGE_MONITOR: the monitor flag changed
828
 * @IEEE80211_CONF_CHANGE_PS: the PS flag or dynamic PS timeout changed
829
 * @IEEE80211_CONF_CHANGE_POWER: the TX power changed
830
 * @IEEE80211_CONF_CHANGE_CHANNEL: the channel/channel_type changed
831
 * @IEEE80211_CONF_CHANGE_RETRY_LIMITS: retry limits changed
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 * @IEEE80211_CONF_CHANGE_IDLE: Idle flag changed
833
 * @IEEE80211_CONF_CHANGE_SMPS: Spatial multiplexing powersave mode changed
834 835
 *	Note that this is only valid if channel contexts are not used,
 *	otherwise each channel context has the number of chains listed.
836 837
 */
enum ieee80211_conf_changed {
838
	IEEE80211_CONF_CHANGE_SMPS		= BIT(1),
839
	IEEE80211_CONF_CHANGE_LISTEN_INTERVAL	= BIT(2),
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840
	IEEE80211_CONF_CHANGE_MONITOR		= BIT(3),
841
	IEEE80211_CONF_CHANGE_PS		= BIT(4),
842 843 844
	IEEE80211_CONF_CHANGE_POWER		= BIT(5),
	IEEE80211_CONF_CHANGE_CHANNEL		= BIT(6),
	IEEE80211_CONF_CHANGE_RETRY_LIMITS	= BIT(7),
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	IEEE80211_CONF_CHANGE_IDLE		= BIT(8),
846 847
};

848 849 850
/**
 * enum ieee80211_smps_mode - spatial multiplexing power save mode
 *
851 852 853 854 855
 * @IEEE80211_SMPS_AUTOMATIC: automatic
 * @IEEE80211_SMPS_OFF: off
 * @IEEE80211_SMPS_STATIC: static
 * @IEEE80211_SMPS_DYNAMIC: dynamic
 * @IEEE80211_SMPS_NUM_MODES: internal, don't use
856 857 858 859 860 861 862 863 864 865 866
 */
enum ieee80211_smps_mode {
	IEEE80211_SMPS_AUTOMATIC,
	IEEE80211_SMPS_OFF,
	IEEE80211_SMPS_STATIC,
	IEEE80211_SMPS_DYNAMIC,

	/* keep last */
	IEEE80211_SMPS_NUM_MODES,
};

867 868 869 870 871
/**
 * struct ieee80211_conf - configuration of the device
 *
 * This struct indicates how the driver shall configure the hardware.
 *
872 873
 * @flags: configuration flags defined above
 *
874
 * @listen_interval: listen interval in units of beacon interval
875
 * @max_sleep_period: the maximum number of beacon intervals to sleep for
876 877 878 879
 *	before checking the beacon for a TIM bit (managed mode only); this
 *	value will be only achievable between DTIM frames, the hardware
 *	needs to check for the multicast traffic bit in DTIM beacons.
 *	This variable is valid only when the CONF_PS flag is set.
880 881 882
 * @ps_dtim_period: The DTIM period of the AP we're connected to, for use
 *	in power saving. Power saving will not be enabled until a beacon
 *	has been received and the DTIM period is known.
883 884 885 886
 * @dynamic_ps_timeout: The dynamic powersave timeout (in ms), see the
 *	powersave documentation below. This variable is valid only when
 *	the CONF_PS flag is set.
 *
887
 * @power_level: requested transmit power (in dBm)
888
 *
889
 * @channel: the channel to tune to
890
 * @channel_type: the channel (HT) type
891
 *
892 893 894 895 896 897
 * @long_frame_max_tx_count: Maximum number of transmissions for a "long" frame
 *    (a frame not RTS protected), called "dot11LongRetryLimit" in 802.11,
 *    but actually means the number of transmissions not the number of retries
 * @short_frame_max_tx_count: Maximum number of transmissions for a "short"
 *    frame, called "dot11ShortRetryLimit" in 802.11, but actually means the
 *    number of transmissions not the number of retries
898 899 900
 *
 * @smps_mode: spatial multiplexing powersave mode; note that
 *	%IEEE80211_SMPS_STATIC is used when the device is not
901 902 903
 *	configured for an HT channel.
 *	Note that this is only valid if channel contexts are not used,
 *	otherwise each channel context has the number of chains listed.
904 905
 */
struct ieee80211_conf {
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906
	u32 flags;
907
	int power_level, dynamic_ps_timeout;
908
	int max_sleep_period;
909

910
	u16 listen_interval;
911
	u8 ps_dtim_period;
912

913 914
	u8 long_frame_max_tx_count, short_frame_max_tx_count;

915
	struct ieee80211_channel *channel;
916
	enum nl80211_channel_type channel_type;
917
	enum ieee80211_smps_mode smps_mode;
918 919
};

920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
/**
 * struct ieee80211_channel_switch - holds the channel switch data
 *
 * The information provided in this structure is required for channel switch
 * operation.
 *
 * @timestamp: value in microseconds of the 64-bit Time Synchronization
 *	Function (TSF) timer when the frame containing the channel switch
 *	announcement was received. This is simply the rx.mactime parameter
 *	the driver passed into mac80211.
 * @block_tx: Indicates whether transmission must be blocked before the
 *	scheduled channel switch, as indicated by the AP.
 * @channel: the new channel to switch to
 * @count: the number of TBTT's until the channel switch event
 */
struct ieee80211_channel_switch {
	u64 timestamp;
	bool block_tx;
	struct ieee80211_channel *channel;
	u8 count;
};

942 943 944 945 946
/**
 * enum ieee80211_vif_flags - virtual interface flags
 *
 * @IEEE80211_VIF_BEACON_FILTER: the device performs beacon filtering
 *	on this virtual interface to avoid unnecessary CPU wakeups
947 948 949 950
 * @IEEE80211_VIF_SUPPORTS_CQM_RSSI: the device can do connection quality
 *	monitoring on this virtual interface -- i.e. it can monitor
 *	connection quality related parameters, such as the RSSI level and
 *	provide notifications if configured trigger levels are reached.
951 952 953
 */
enum ieee80211_vif_flags {
	IEEE80211_VIF_BEACON_FILTER		= BIT(0),
954
	IEEE80211_VIF_SUPPORTS_CQM_RSSI		= BIT(1),
955 956
};

957 958 959 960 961 962
/**
 * struct ieee80211_vif - per-interface data
 *
 * Data in this structure is continually present for driver
 * use during the life of a virtual interface.
 *
963
 * @type: type of this virtual interface
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 * @bss_conf: BSS configuration for this interface, either our own
 *	or the BSS we're associated to
966
 * @addr: address of this interface
967 968
 * @p2p: indicates whether this AP or STA interface is a p2p
 *	interface, i.e. a GO or p2p-sta respectively
969 970 971 972
 * @driver_flags: flags/capabilities the driver has for this interface,
 *	these need to be set (or cleared) when the interface is added
 *	or, if supported by the driver, the interface type is changed
 *	at runtime, mac80211 will never touch this field
973 974
 * @hw_queue: hardware queue for each AC
 * @cab_queue: content-after-beacon (DTIM beacon really) queue, AP mode only
975 976 977 978 979
 * @chanctx_conf: The channel context this interface is assigned to, or %NULL
 *	when it is not assigned. This pointer is RCU-protected due to the TX
 *	path needing to access it; even though the netdev carrier will always
 *	be off when it is %NULL there can still be races and packets could be
 *	processed after it switches back to %NULL.
980 981 982 983
 * @drv_priv: data area for driver use, will always be aligned to
 *	sizeof(void *).
 */
struct ieee80211_vif {
984
	enum nl80211_iftype type;
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985
	struct ieee80211_bss_conf bss_conf;
986
	u8 addr[ETH_ALEN];
987
	bool p2p;
988 989 990 991

	u8 cab_queue;
	u8 hw_queue[IEEE80211_NUM_ACS];

992 993
	struct ieee80211_chanctx_conf __rcu *chanctx_conf;

994
	u32 driver_flags;
995

996 997 998 999
	/* must be last */
	u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
};

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1000 1001 1002
static inline bool ieee80211_vif_is_mesh(struct ieee80211_vif *vif)
{
#ifdef CONFIG_MAC80211_MESH
1003
	return vif->type == NL80211_IFTYPE_MESH_POINT;
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1004 1005 1006 1007
#endif
	return false;
}

1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
/**
 * enum ieee80211_key_flags - key flags
 *
 * These flags are used for communication about keys between the driver
 * and mac80211, with the @flags parameter of &struct ieee80211_key_conf.
 *
 * @IEEE80211_KEY_FLAG_WMM_STA: Set by mac80211, this flag indicates
 *	that the STA this key will be used with could be using QoS.
 * @IEEE80211_KEY_FLAG_GENERATE_IV: This flag should be set by the
 *	driver to indicate that it requires IV generation for this
 *	particular key.
 * @IEEE80211_KEY_FLAG_GENERATE_MMIC: This flag should be set by
 *	the driver for a TKIP key if it requires Michael MIC
 *	generation in software.
1022 1023
 * @IEEE80211_KEY_FLAG_PAIRWISE: Set by mac80211, this flag indicates
 *	that the key is pairwise rather then a shared key.
1024
 * @IEEE80211_KEY_FLAG_SW_MGMT_TX: This flag should be set by the driver for a
1025 1026
 *	CCMP key if it requires CCMP encryption of management frames (MFP) to
 *	be done in software.
1027
 * @IEEE80211_KEY_FLAG_PUT_IV_SPACE: This flag should be set by the driver
1028
 *	if space should be prepared for the IV, but the IV
1029 1030
 *	itself should not be generated. Do not set together with
 *	@IEEE80211_KEY_FLAG_GENERATE_IV on the same key.
1031 1032 1033 1034 1035 1036 1037
 * @IEEE80211_KEY_FLAG_RX_MGMT: This key will be used to decrypt received
 *	management frames. The flag can help drivers that have a hardware
 *	crypto implementation that doesn't deal with management frames
 *	properly by allowing them to not upload the keys to hardware and
 *	fall back to software crypto. Note that this flag deals only with
 *	RX, if your crypto engine can't deal with TX you can also set the
 *	%IEEE80211_KEY_FLAG_SW_MGMT_TX flag to encrypt such frames in SW.
1038
 */
1039 1040 1041 1042
enum ieee80211_key_flags {
	IEEE80211_KEY_FLAG_WMM_STA	= 1<<0,
	IEEE80211_KEY_FLAG_GENERATE_IV	= 1<<1,
	IEEE80211_KEY_FLAG_GENERATE_MMIC= 1<<2,
1043
	IEEE80211_KEY_FLAG_PAIRWISE	= 1<<3,
1044
	IEEE80211_KEY_FLAG_SW_MGMT_TX	= 1<<4,
1045
	IEEE80211_KEY_FLAG_PUT_IV_SPACE = 1<<5,
1046
	IEEE80211_KEY_FLAG_RX_MGMT	= 1<<6,
1047
};
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1049 1050 1051 1052 1053 1054 1055 1056
/**
 * struct ieee80211_key_conf - key information
 *
 * This key information is given by mac80211 to the driver by
 * the set_key() callback in &struct ieee80211_ops.
 *
 * @hw_key_idx: To be set by the driver, this is the key index the driver
 *	wants to be given when a frame is transmitted and needs to be
1057
 *	encrypted in hardware.
1058
 * @cipher: The key's cipher suite selector.
1059 1060 1061
 * @flags: key flags, see &enum ieee80211_key_flags.
 * @keyidx: the key index (0-3)
 * @keylen: key material length
1062 1063 1064 1065 1066
 * @key: key material. For ALG_TKIP the key is encoded as a 256-bit (32 byte)
 * 	data block:
 * 	- Temporal Encryption Key (128 bits)
 * 	- Temporal Authenticator Tx MIC Key (64 bits)
 * 	- Temporal Authenticator Rx MIC Key (64 bits)
1067 1068
 * @icv_len: The ICV length for this key type
 * @iv_len: The IV length for this key type
1069
 */
1070
struct ieee80211_key_conf {
1071
	u32 cipher;
1072 1073
	u8 icv_len;
	u8 iv_len;
1074
	u8 hw_key_idx;
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1075 1076 1077
	u8 flags;
	s8 keyidx;
	u8 keylen;
1078 1079 1080
	u8 key[0];
};

1081 1082 1083 1084 1085 1086 1087 1088 1089
/**
 * enum set_key_cmd - key command
 *
 * Used with the set_key() callback in &struct ieee80211_ops, this
 * indicates whether a key is being removed or added.
 *
 * @SET_KEY: a key is set
 * @DISABLE_KEY: a key must be disabled
 */
1090
enum set_key_cmd {
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1091
	SET_KEY, DISABLE_KEY,
1092
};
1093

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1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
/**
 * enum ieee80211_sta_state - station state
 *
 * @IEEE80211_STA_NOTEXIST: station doesn't exist at all,
 *	this is a special state for add/remove transitions
 * @IEEE80211_STA_NONE: station exists without special state
 * @IEEE80211_STA_AUTH: station is authenticated
 * @IEEE80211_STA_ASSOC: station is associated
 * @IEEE80211_STA_AUTHORIZED: station is authorized (802.1X)
 */
enum ieee80211_sta_state {
	/* NOTE: These need to be ordered correctly! */
	IEEE80211_STA_NOTEXIST,
	IEEE80211_STA_NONE,
	IEEE80211_STA_AUTH,
	IEEE80211_STA_ASSOC,
	IEEE80211_STA_AUTHORIZED,
};

1113 1114 1115 1116 1117 1118 1119 1120
/**
 * struct ieee80211_sta - station table entry
 *
 * A station table entry represents a station we are possibly
 * communicating with. Since stations are RCU-managed in
 * mac80211, any ieee80211_sta pointer you get access to must
 * either be protected by rcu_read_lock() explicitly or implicitly,
 * or you must take good care to not use such a pointer after a
1121
 * call to your sta_remove callback that removed it.
1122 1123 1124
 *
 * @addr: MAC address
 * @aid: AID we assigned to the station if we're an AP
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 * @supp_rates: Bitmap of supported rates (per band)
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 * @ht_cap: HT capabilities of this STA; restricted to our own TX capabilities
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1127 1128
 * @vht_cap: VHT capabilities of this STA; Not restricting any capabilities
 * 	of remote STA. Taking as is.
1129
 * @wme: indicates whether the STA supports WME. Only valid during AP-mode.
1130 1131
 * @drv_priv: data area for driver use, will always be aligned to
 *	sizeof(void *), size is determined in hw information.
1132 1133 1134
 * @uapsd_queues: bitmap of queues configured for uapsd. Only valid
 *	if wme is supported.
 * @max_sp: max Service Period. Only valid if wme is supported.
1135 1136
 */
struct ieee80211_sta {
1137
	u32 supp_rates[IEEE80211_NUM_BANDS];
1138 1139
	u8 addr[ETH_ALEN];
	u16 aid;
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1140
	struct ieee80211_sta_ht_cap ht_cap;
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1141
	struct ieee80211_sta_vht_cap vht_cap;
1142
	bool wme;
1143 1144
	u8 uapsd_queues;
	u8 max_sp;
1145 1146 1147 1148 1149

	/* must be last */
	u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
};

1150 1151 1152 1153
/**
 * enum sta_notify_cmd - sta notify command
 *
 * Used with the sta_notify() callback in &struct ieee80211_ops, this
1154
 * indicates if an associated station made a power state transition.
1155
 *
1156 1157 1158
 * @STA_NOTIFY_SLEEP: a station is now sleeping
 * @STA_NOTIFY_AWAKE: a sleeping station woke up
 */
1159
enum sta_notify_cmd {
1160 1161 1162
	STA_NOTIFY_SLEEP, STA_NOTIFY_AWAKE,
};

1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
/**
 * struct ieee80211_tx_control - TX control data
 *
 * @sta: station table entry, this sta pointer may be NULL and
 * 	it is not allowed to copy the pointer, due to RCU.
 */
struct ieee80211_tx_control {
	struct ieee80211_sta *sta;
};

1173 1174 1175 1176 1177 1178 1179 1180 1181
/**
 * enum ieee80211_hw_flags - hardware flags
 *
 * These flags are used to indicate hardware capabilities to
 * the stack. Generally, flags here should have their meaning
 * done in a way that the simplest hardware doesn't need setting
 * any particular flags. There are some exceptions to this rule,
 * however, so you are advised to review these flags carefully.
 *
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
 * @IEEE80211_HW_HAS_RATE_CONTROL:
 *	The hardware or firmware includes rate control, and cannot be
 *	controlled by the stack. As such, no rate control algorithm
 *	should be instantiated, and the TX rate reported to userspace
 *	will be taken from the TX status instead of the rate control
 *	algorithm.
 *	Note that this requires that the driver implement a number of
 *	callbacks so it has the correct information, it needs to have
 *	the @set_rts_threshold callback and must look at the BSS config
 *	@use_cts_prot for G/N protection, @use_short_slot for slot
 *	timing in 2.4 GHz and @use_short_preamble for preambles for
 *	CCK frames.
 *
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
 * @IEEE80211_HW_RX_INCLUDES_FCS:
 *	Indicates that received frames passed to the stack include
 *	the FCS at the end.
 *
 * @IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING:
 *	Some wireless LAN chipsets buffer broadcast/multicast frames
 *	for power saving stations in the hardware/firmware and others
 *	rely on the host system for such buffering. This option is used
 *	to configure the IEEE 802.11 upper layer to buffer broadcast and
 *	multicast frames when there are power saving stations so that
1205
 *	the driver can fetch them with ieee80211_get_buffered_bc().
1206
 *
1207 1208 1209 1210 1211 1212
 * @IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE:
 *	Hardware is not capable of short slot operation on the 2.4 GHz band.
 *
 * @IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE:
 *	Hardware is not capable of receiving frames with short preamble on
 *	the 2.4 GHz band.
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
 *
 * @IEEE80211_HW_SIGNAL_UNSPEC:
 *	Hardware can provide signal values but we don't know its units. We
 *	expect values between 0 and @max_signal.
 *	If possible please provide dB or dBm instead.
 *
 * @IEEE80211_HW_SIGNAL_DBM:
 *	Hardware gives signal values in dBm, decibel difference from
 *	one milliwatt. This is the preferred method since it is standardized
 *	between different devices. @max_signal does not need to be set.
 *
1224 1225 1226
 * @IEEE80211_HW_SPECTRUM_MGMT:
 * 	Hardware supports spectrum management defined in 802.11h
 * 	Measurement, Channel Switch, Quieting, TPC
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1227 1228 1229
 *
 * @IEEE80211_HW_AMPDU_AGGREGATION:
 *	Hardware supports 11n A-MPDU aggregation.
1230
 *
1231 1232 1233 1234 1235 1236 1237 1238 1239
 * @IEEE80211_HW_SUPPORTS_PS:
 *	Hardware has power save support (i.e. can go to sleep).
 *
 * @IEEE80211_HW_PS_NULLFUNC_STACK:
 *	Hardware requires nullfunc frame handling in stack, implies
 *	stack support for dynamic PS.
 *
 * @IEEE80211_HW_SUPPORTS_DYNAMIC_PS:
 *	Hardware has support for dynamic PS.
1240 1241 1242
 *
 * @IEEE80211_HW_MFP_CAPABLE:
 *	Hardware supports management frame protection (MFP, IEEE 802.11w).
1243
 *
1244 1245 1246 1247 1248 1249 1250 1251 1252
 * @IEEE80211_HW_SUPPORTS_STATIC_SMPS:
 *	Hardware supports static spatial multiplexing powersave,
 *	ie. can turn off all but one chain even on HT connections
 *	that should be using more chains.
 *
 * @IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS:
 *	Hardware supports dynamic spatial multiplexing powersave,
 *	ie. can turn off all but one chain and then wake the rest
 *	up as required after, for example, rts/cts handshake.
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1253 1254 1255 1256 1257
 *
 * @IEEE80211_HW_SUPPORTS_UAPSD:
 *	Hardware supports Unscheduled Automatic Power Save Delivery
 *	(U-APSD) in managed mode. The mode is configured with
 *	conf_tx() operation.
1258 1259 1260 1261 1262
 *
 * @IEEE80211_HW_REPORTS_TX_ACK_STATUS:
 *	Hardware can provide ack status reports of Tx frames to
 *	the stack.
 *
1263 1264 1265 1266 1267
 * @IEEE80211_HW_CONNECTION_MONITOR:
 *      The hardware performs its own connection monitoring, including
 *      periodic keep-alives to the AP and probing the AP on beacon loss.
 *      When this flag is set, signaling beacon-loss will cause an immediate
 *      change to disassociated state.
1268
 *
1269 1270 1271
 * @IEEE80211_HW_NEED_DTIM_PERIOD:
 *	This device needs to know the DTIM period for the BSS before
 *	associating.
1272 1273 1274 1275 1276 1277 1278
 *
 * @IEEE80211_HW_SUPPORTS_PER_STA_GTK: The device's crypto engine supports
 *	per-station GTKs as used by IBSS RSN or during fast transition. If
 *	the device doesn't support per-station GTKs, but can be asked not
 *	to decrypt group addressed frames, then IBSS RSN support is still
 *	possible but software crypto will be used. Advertise the wiphy flag
 *	only in that case.
1279 1280 1281 1282 1283 1284 1285
 *
 * @IEEE80211_HW_AP_LINK_PS: When operating in AP mode the device
 *	autonomously manages the PS status of connected stations. When
 *	this flag is set mac80211 will not trigger PS mode for connected
 *	stations based on the PM bit of incoming frames.
 *	Use ieee80211_start_ps()/ieee8021_end_ps() to manually configure
 *	the PS mode of connected stations.
1286 1287 1288 1289
 *
 * @IEEE80211_HW_TX_AMPDU_SETUP_IN_HW: The device handles TX A-MPDU session
 *	setup strictly in HW. mac80211 should not attempt to do this in
 *	software.
1290 1291 1292 1293
 *
 * @IEEE80211_HW_SCAN_WHILE_IDLE: The device can do hw scan while
 *	being idle (i.e. mac80211 doesn't have to go idle-off during the
 *	the scan).
1294 1295 1296 1297
 *
 * @IEEE80211_HW_WANT_MONITOR_VIF: The driver would like to be informed of
 *	a virtual monitor interface when monitor interfaces are the only
 *	active interfaces.
1298 1299 1300 1301 1302
 *
 * @IEEE80211_HW_QUEUE_CONTROL: The driver wants to control per-interface
 *	queue mapping in order to use different queues (not just one per AC)
 *	for different virtual interfaces. See the doc section on HW queue
 *	control for more details.
1303 1304 1305 1306
 *
 * @IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF: Use the P2P Device address for any
 *	P2P Interface. This will be honoured even if more than one interface
 *	is supported.
1307 1308
 */
enum ieee80211_hw_flags {
1309
	IEEE80211_HW_HAS_RATE_CONTROL			= 1<<0,
1310 1311
	IEEE80211_HW_RX_INCLUDES_FCS			= 1<<1,
	IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING	= 1<<2,
1312 1313
	IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE		= 1<<3,
	IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE	= 1<<4,
1314
	IEEE80211_HW_SIGNAL_UNSPEC			= 1<<5,
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1315
	IEEE80211_HW_SIGNAL_DBM				= 1<<6,
1316
	IEEE80211_HW_NEED_DTIM_PERIOD			= 1<<7,
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1317 1318 1319 1320 1321 1322
	IEEE80211_HW_SPECTRUM_MGMT			= 1<<8,
	IEEE80211_HW_AMPDU_AGGREGATION			= 1<<9,
	IEEE80211_HW_SUPPORTS_PS			= 1<<10,
	IEEE80211_HW_PS_NULLFUNC_STACK			= 1<<11,
	IEEE80211_HW_SUPPORTS_DYNAMIC_PS		= 1<<12,
	IEEE80211_HW_MFP_CAPABLE			= 1<<13,
1323
	IEEE80211_HW_WANT_MONITOR_VIF			= 1<<14,
1324 1325
	IEEE80211_HW_SUPPORTS_STATIC_SMPS		= 1<<15,
	IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS		= 1<<16,
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1326
	IEEE80211_HW_SUPPORTS_UAPSD			= 1<<17,
1327
	IEEE80211_HW_REPORTS_TX_ACK_STATUS		= 1<<18,
1328
	IEEE80211_HW_CONNECTION_MONITOR			= 1<<19,
1329
	IEEE80211_HW_QUEUE_CONTROL			= 1<<20,
1330
	IEEE80211_HW_SUPPORTS_PER_STA_GTK		= 1<<21,
1331
	IEEE80211_HW_AP_LINK_PS				= 1<<22,
1332
	IEEE80211_HW_TX_AMPDU_SETUP_IN_HW		= 1<<23,
1333
	IEEE80211_HW_SCAN_WHILE_IDLE			= 1<<24,
1334
	IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF		= 1<<25,
1335 1336
};

1337 1338
/**
 * struct ieee80211_hw - hardware information and state
1339 1340 1341 1342 1343 1344 1345
 *
 * This structure contains the configuration and hardware
 * information for an 802.11 PHY.
 *
 * @wiphy: This points to the &struct wiphy allocated for this
 *	802.11 PHY. You must fill in the @perm_addr and @dev
 *	members of this structure using SET_IEEE80211_DEV()
1346 1347
 *	and SET_IEEE80211_PERM_ADDR(). Additionally, all supported
 *	bands (with channels, bitrates) are registered here.
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
 *
 * @conf: &struct ieee80211_conf, device configuration, don't use.
 *
 * @priv: pointer to private area that was allocated for driver use
 *	along with this structure.
 *
 * @flags: hardware flags, see &enum ieee80211_hw_flags.
 *
 * @extra_tx_headroom: headroom to reserve in each transmit skb
 *	for use by the driver (e.g. for transmit headers.)
 *
 * @channel_change_time: time (in microseconds) it takes to change channels.
 *
1361 1362
 * @max_signal: Maximum value for signal (rssi) in RX information, used
 *     only when @IEEE80211_HW_SIGNAL_UNSPEC or @IEEE80211_HW_SIGNAL_DB
1363
 *
1364 1365 1366
 * @max_listen_interval: max listen interval in units of beacon interval
 *     that HW supports
 *
1367
 * @queues: number of available hardware transmit queues for
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1368 1369 1370
 *	data packets. WMM/QoS requires at least four, these
 *	queues need to have configurable access parameters.
 *
1371 1372 1373
 * @rate_control_algorithm: rate control algorithm for this hardware.
 *	If unset (NULL), the default algorithm will be used. Must be
 *	set before calling ieee80211_register_hw().
1374 1375 1376
 *
 * @vif_data_size: size (in bytes) of the drv_priv data area
 *	within &struct ieee80211_vif.
1377 1378
 * @sta_data_size: size (in bytes) of the drv_priv data area
 *	within &struct ieee80211_sta.
1379 1380
 * @chanctx_data_size: size (in bytes) of the drv_priv data area
 *	within &struct ieee80211_chanctx_conf.
1381
 *
1382 1383 1384 1385
 * @max_rates: maximum number of alternate rate retry stages the hw
 *	can handle.
 * @max_report_rates: maximum number of alternate rate retry stages
 *	the hw can report back.
1386
 * @max_rate_tries: maximum number of tries for each stage
1387 1388 1389 1390
 *
 * @napi_weight: weight used for NAPI polling.  You must specify an
 *	appropriate value here if a napi_poll operation is provided
 *	by your driver.
1391
 *
1392 1393 1394 1395 1396 1397
 * @max_rx_aggregation_subframes: maximum buffer size (number of
 *	sub-frames) to be used for A-MPDU block ack receiver
 *	aggregation.
 *	This is only relevant if the device has restrictions on the
 *	number of subframes, if it relies on mac80211 to do reordering
 *	it shouldn't be set.
1398 1399 1400 1401
 *
 * @max_tx_aggregation_subframes: maximum number of subframes in an
 *	aggregate an HT driver will transmit, used by the peer as a
 *	hint to size its reorder buffer.
1402 1403 1404
 *
 * @offchannel_tx_hw_queue: HW queue ID to use for offchannel TX
 *	(if %IEEE80211_HW_QUEUE_CONTROL is set)
1405 1406 1407 1408 1409
 *
 * @radiotap_mcs_details: lists which MCS information can the HW
 *	reports, by default it is set to _MCS, _GI and _BW but doesn't
 *	include _FMT. Use %IEEE80211_RADIOTAP_MCS_HAVE_* values, only
 *	adding _BW is supported today.
1410 1411 1412 1413
 *
 * @netdev_features: netdev features to be set in each netdev created
 *	from this HW. Note only HW checksum features are currently
 *	compatible with mac80211. Other feature bits will be rejected.
1414
 */
1415 1416
struct ieee80211_hw {
	struct ieee80211_conf conf;
1417
	struct wiphy *wiphy;
1418
	const char *rate_control_algorithm;
1419
	void *priv;
1420
	u32 flags;
1421 1422
	unsigned int extra_tx_headroom;
	int channel_change_time;
1423
	int vif_data_size;
1424
	int sta_data_size;
1425
	int chanctx_data_size;
1426
	int napi_weight;
1427 1428
	u16 queues;
	u16 max_listen_interval;
1429
	s8 max_signal;
1430
	u8 max_rates;
1431
	u8 max_report_rates;
1432
	u8 max_rate_tries;
1433
	u8 max_rx_aggregation_subframes;
1434
	u8 max_tx_aggregation_subframes;
1435
	u8 offchannel_tx_hw_queue;
1436
	u8 radiotap_mcs_details;
1437
	netdev_features_t netdev_features;
1438 1439
};

1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
/**
 * wiphy_to_ieee80211_hw - return a mac80211 driver hw struct from a wiphy
 *
 * @wiphy: the &struct wiphy which we want to query
 *
 * mac80211 drivers can use this to get to their respective
 * &struct ieee80211_hw. Drivers wishing to get to their own private
 * structure can then access it via hw->priv. Note that mac802111 drivers should
 * not use wiphy_priv() to try to get their private driver structure as this
 * is already used internally by mac80211.
 */
struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy);

1453 1454 1455 1456 1457 1458
/**
 * SET_IEEE80211_DEV - set device for 802.11 hardware
 *
 * @hw: the &struct ieee80211_hw to set the device for
 * @dev: the &struct device of this 802.11 device
 */
1459 1460 1461 1462 1463
static inline void SET_IEEE80211_DEV(struct ieee80211_hw *hw, struct device *dev)
{
	set_wiphy_dev(hw->wiphy, dev);
}

1464
/**
1465
 * SET_IEEE80211_PERM_ADDR - set the permanent MAC address for 802.11 hardware
1466 1467 1468 1469
 *
 * @hw: the &struct ieee80211_hw to set the MAC address for
 * @addr: the address to set
 */
1470 1471 1472 1473 1474
static inline void SET_IEEE80211_PERM_ADDR(struct ieee80211_hw *hw, u8 *addr)
{
	memcpy(hw->wiphy->perm_addr, addr, ETH_ALEN);
}

1475 1476
static inline struct ieee80211_rate *
ieee80211_get_tx_rate(const struct ieee80211_hw *hw,
1477
		      const struct ieee80211_tx_info *c)
1478
{
1479
	if (WARN_ON_ONCE(c->control.rates[0].idx < 0))
1480
		return NULL;
1481
	return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[0].idx];
1482 1483 1484 1485
}

static inline struct ieee80211_rate *
ieee80211_get_rts_cts_rate(const struct ieee80211_hw *hw,
1486
			   const struct ieee80211_tx_info *c)
1487
{
1488
	if (c->control.rts_cts_rate_idx < 0)
1489
		return NULL;
1490
	return &hw->wiphy->bands[c->band]->bitrates[c->control.rts_cts_rate_idx];
1491 1492 1493 1494
}

static inline struct ieee80211_rate *
ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
1495
			     const struct ieee80211_tx_info *c, int idx)
1496
{
1497
	if (c->control.rates[idx + 1].idx < 0)
1498
		return NULL;
1499
	return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[idx + 1].idx];
1500 1501
}

1502 1503 1504 1505 1506 1507 1508 1509 1510 1511
/**
 * ieee80211_free_txskb - free TX skb
 * @hw: the hardware
 * @skb: the skb
 *
 * Free a transmit skb. Use this funtion when some failure
 * to transmit happened and thus status cannot be reported.
 */
void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb);

1512 1513 1514 1515 1516 1517 1518 1519
/**
 * DOC: Hardware crypto acceleration
 *
 * mac80211 is capable of taking advantage of many hardware
 * acceleration designs for encryption and decryption operations.
 *
 * The set_key() callback in the &struct ieee80211_ops for a given
 * device is called to enable hardware acceleration of encryption and
1520 1521 1522
 * decryption. The callback takes a @sta parameter that will be NULL
 * for default keys or keys used for transmission only, or point to
 * the station information for the peer for individual keys.
1523 1524
 * Multiple transmission keys with the same key index may be used when
 * VLANs are configured for an access point.
1525
 *
1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545
 * When transmitting, the TX control data will use the @hw_key_idx
 * selected by the driver by modifying the &struct ieee80211_key_conf
 * pointed to by the @key parameter to the set_key() function.
 *
 * The set_key() call for the %SET_KEY command should return 0 if
 * the key is now in use, -%EOPNOTSUPP or -%ENOSPC if it couldn't be
 * added; if you return 0 then hw_key_idx must be assigned to the
 * hardware key index, you are free to use the full u8 range.
 *
 * When the cmd is %DISABLE_KEY then it must succeed.
 *
 * Note that it is permissible to not decrypt a frame even if a key
 * for it has been uploaded to hardware, the stack will not make any
 * decision based on whether a key has been uploaded or not but rather
 * based on the receive flags.
 *
 * The &struct ieee80211_key_conf structure pointed to by the @key
 * parameter is guaranteed to be valid until another call to set_key()
 * removes it, but it can only be used as a cookie to differentiate
 * keys.
1546 1547 1548 1549 1550
 *
 * In TKIP some HW need to be provided a phase 1 key, for RX decryption
 * acceleration (i.e. iwlwifi). Those drivers should provide update_tkip_key
 * handler.
 * The update_tkip_key() call updates the driver with the new phase 1 key.
L
Lucas De Marchi 已提交
1551
 * This happens every time the iv16 wraps around (every 65536 packets). The
1552 1553
 * set_key() call will happen only once for each key (unless the AP did
 * rekeying), it will not include a valid phase 1 key. The valid phase 1 key is
1554
 * provided by update_tkip_key only. The trigger that makes mac80211 call this
1555
 * handler is software decryption with wrap around of iv16.
1556
 */
1557

1558 1559 1560 1561 1562
/**
 * DOC: Powersave support
 *
 * mac80211 has support for various powersave implementations.
 *
1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
 * First, it can support hardware that handles all powersaving by itself,
 * such hardware should simply set the %IEEE80211_HW_SUPPORTS_PS hardware
 * flag. In that case, it will be told about the desired powersave mode
 * with the %IEEE80211_CONF_PS flag depending on the association status.
 * The hardware must take care of sending nullfunc frames when necessary,
 * i.e. when entering and leaving powersave mode. The hardware is required
 * to look at the AID in beacons and signal to the AP that it woke up when
 * it finds traffic directed to it.
 *
 * %IEEE80211_CONF_PS flag enabled means that the powersave mode defined in
 * IEEE 802.11-2007 section 11.2 is enabled. This is not to be confused
 * with hardware wakeup and sleep states. Driver is responsible for waking
B
Bob Copeland 已提交
1575 1576
 * up the hardware before issuing commands to the hardware and putting it
 * back to sleep at appropriate times.
1577 1578 1579 1580
 *
 * When PS is enabled, hardware needs to wakeup for beacons and receive the
 * buffered multicast/broadcast frames after the beacon. Also it must be
 * possible to send frames and receive the acknowledment frame.
1581 1582 1583 1584 1585
 *
 * Other hardware designs cannot send nullfunc frames by themselves and also
 * need software support for parsing the TIM bitmap. This is also supported
 * by mac80211 by combining the %IEEE80211_HW_SUPPORTS_PS and
 * %IEEE80211_HW_PS_NULLFUNC_STACK flags. The hardware is of course still
1586 1587
 * required to pass up beacons. The hardware is still required to handle
 * waking up for multicast traffic; if it cannot the driver must handle that
1588 1589 1590 1591 1592 1593 1594 1595 1596
 * as best as it can, mac80211 is too slow to do that.
 *
 * Dynamic powersave is an extension to normal powersave in which the
 * hardware stays awake for a user-specified period of time after sending a
 * frame so that reply frames need not be buffered and therefore delayed to
 * the next wakeup. It's compromise of getting good enough latency when
 * there's data traffic and still saving significantly power in idle
 * periods.
 *
B
Bob Copeland 已提交
1597
 * Dynamic powersave is simply supported by mac80211 enabling and disabling
1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
 * PS based on traffic. Driver needs to only set %IEEE80211_HW_SUPPORTS_PS
 * flag and mac80211 will handle everything automatically. Additionally,
 * hardware having support for the dynamic PS feature may set the
 * %IEEE80211_HW_SUPPORTS_DYNAMIC_PS flag to indicate that it can support
 * dynamic PS mode itself. The driver needs to look at the
 * @dynamic_ps_timeout hardware configuration value and use it that value
 * whenever %IEEE80211_CONF_PS is set. In this case mac80211 will disable
 * dynamic PS feature in stack and will just keep %IEEE80211_CONF_PS
 * enabled whenever user has enabled powersave.
 *
1608 1609 1610 1611 1612 1613 1614 1615 1616
 * Some hardware need to toggle a single shared antenna between WLAN and
 * Bluetooth to facilitate co-existence. These types of hardware set
 * limitations on the use of host controlled dynamic powersave whenever there
 * is simultaneous WLAN and Bluetooth traffic. For these types of hardware, the
 * driver may request temporarily going into full power save, in order to
 * enable toggling the antenna between BT and WLAN. If the driver requests
 * disabling dynamic powersave, the @dynamic_ps_timeout value will be
 * temporarily set to zero until the driver re-enables dynamic powersave.
 *
1617 1618 1619 1620 1621 1622 1623 1624 1625
 * Driver informs U-APSD client support by enabling
 * %IEEE80211_HW_SUPPORTS_UAPSD flag. The mode is configured through the
 * uapsd paramater in conf_tx() operation. Hardware needs to send the QoS
 * Nullfunc frames and stay awake until the service period has ended. To
 * utilize U-APSD, dynamic powersave is disabled for voip AC and all frames
 * from that AC are transmitted with powersave enabled.
 *
 * Note: U-APSD client mode is not yet supported with
 * %IEEE80211_HW_PS_NULLFUNC_STACK.
1626 1627
 */

1628 1629 1630 1631
/**
 * DOC: Beacon filter support
 *
 * Some hardware have beacon filter support to reduce host cpu wakeups
1632
 * which will reduce system power consumption. It usually works so that
1633 1634 1635 1636 1637 1638
 * the firmware creates a checksum of the beacon but omits all constantly
 * changing elements (TSF, TIM etc). Whenever the checksum changes the
 * beacon is forwarded to the host, otherwise it will be just dropped. That
 * way the host will only receive beacons where some relevant information
 * (for example ERP protection or WMM settings) have changed.
 *
1639 1640
 * Beacon filter support is advertised with the %IEEE80211_VIF_BEACON_FILTER
 * interface capability. The driver needs to enable beacon filter support
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
 * whenever power save is enabled, that is %IEEE80211_CONF_PS is set. When
 * power save is enabled, the stack will not check for beacon loss and the
 * driver needs to notify about loss of beacons with ieee80211_beacon_loss().
 *
 * The time (or number of beacons missed) until the firmware notifies the
 * driver of a beacon loss event (which in turn causes the driver to call
 * ieee80211_beacon_loss()) should be configurable and will be controlled
 * by mac80211 and the roaming algorithm in the future.
 *
 * Since there may be constantly changing information elements that nothing
 * in the software stack cares about, we will, in the future, have mac80211
 * tell the driver which information elements are interesting in the sense
 * that we want to see changes in them. This will include
 *  - a list of information element IDs
 *  - a list of OUIs for the vendor information element
 *
 * Ideally, the hardware would filter out any beacons without changes in the
 * requested elements, but if it cannot support that it may, at the expense
 * of some efficiency, filter out only a subset. For example, if the device
 * doesn't support checking for OUIs it should pass up all changes in all
 * vendor information elements.
 *
 * Note that change, for the sake of simplification, also includes information
 * elements appearing or disappearing from the beacon.
 *
 * Some hardware supports an "ignore list" instead, just make sure nothing
 * that was requested is on the ignore list, and include commonly changing
 * information element IDs in the ignore list, for example 11 (BSS load) and
 * the various vendor-assigned IEs with unknown contents (128, 129, 133-136,
 * 149, 150, 155, 156, 173, 176, 178, 179, 219); for forward compatibility
 * it could also include some currently unused IDs.
 *
 *
 * In addition to these capabilities, hardware should support notifying the
 * host of changes in the beacon RSSI. This is relevant to implement roaming
 * when no traffic is flowing (when traffic is flowing we see the RSSI of
 * the received data packets). This can consist in notifying the host when
 * the RSSI changes significantly or when it drops below or rises above
 * configurable thresholds. In the future these thresholds will also be
 * configured by mac80211 (which gets them from userspace) to implement
 * them as the roaming algorithm requires.
 *
 * If the hardware cannot implement this, the driver should ask it to
 * periodically pass beacon frames to the host so that software can do the
 * signal strength threshold checking.
1686 1687
 */

1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712
/**
 * DOC: Spatial multiplexing power save
 *
 * SMPS (Spatial multiplexing power save) is a mechanism to conserve
 * power in an 802.11n implementation. For details on the mechanism
 * and rationale, please refer to 802.11 (as amended by 802.11n-2009)
 * "11.2.3 SM power save".
 *
 * The mac80211 implementation is capable of sending action frames
 * to update the AP about the station's SMPS mode, and will instruct
 * the driver to enter the specific mode. It will also announce the
 * requested SMPS mode during the association handshake. Hardware
 * support for this feature is required, and can be indicated by
 * hardware flags.
 *
 * The default mode will be "automatic", which nl80211/cfg80211
 * defines to be dynamic SMPS in (regular) powersave, and SMPS
 * turned off otherwise.
 *
 * To support this feature, the driver must set the appropriate
 * hardware support flags, and handle the SMPS flag to the config()
 * operation. It will then with this mechanism be instructed to
 * enter the requested SMPS mode while associated to an HT AP.
 */

1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
/**
 * DOC: Frame filtering
 *
 * mac80211 requires to see many management frames for proper
 * operation, and users may want to see many more frames when
 * in monitor mode. However, for best CPU usage and power consumption,
 * having as few frames as possible percolate through the stack is
 * desirable. Hence, the hardware should filter as much as possible.
 *
 * To achieve this, mac80211 uses filter flags (see below) to tell
 * the driver's configure_filter() function which frames should be
 * passed to mac80211 and which should be filtered out.
 *
1726 1727 1728 1729 1730 1731 1732
 * Before configure_filter() is invoked, the prepare_multicast()
 * callback is invoked with the parameters @mc_count and @mc_list
 * for the combined multicast address list of all virtual interfaces.
 * It's use is optional, and it returns a u64 that is passed to
 * configure_filter(). Additionally, configure_filter() has the
 * arguments @changed_flags telling which flags were changed and
 * @total_flags with the new flag states.
1733 1734 1735 1736 1737 1738
 *
 * If your device has no multicast address filters your driver will
 * need to check both the %FIF_ALLMULTI flag and the @mc_count
 * parameter to see whether multicast frames should be accepted
 * or dropped.
 *
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750
 * All unsupported flags in @total_flags must be cleared.
 * Hardware does not support a flag if it is incapable of _passing_
 * the frame to the stack. Otherwise the driver must ignore
 * the flag, but not clear it.
 * You must _only_ clear the flag (announce no support for the
 * flag to mac80211) if you are not able to pass the packet type
 * to the stack (so the hardware always filters it).
 * So for example, you should clear @FIF_CONTROL, if your hardware
 * always filters control frames. If your hardware always passes
 * control frames to the kernel and is incapable of filtering them,
 * you do _not_ clear the @FIF_CONTROL flag.
 * This rule applies to all other FIF flags as well.
1751
 */
1752

1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791
/**
 * DOC: AP support for powersaving clients
 *
 * In order to implement AP and P2P GO modes, mac80211 has support for
 * client powersaving, both "legacy" PS (PS-Poll/null data) and uAPSD.
 * There currently is no support for sAPSD.
 *
 * There is one assumption that mac80211 makes, namely that a client
 * will not poll with PS-Poll and trigger with uAPSD at the same time.
 * Both are supported, and both can be used by the same client, but
 * they can't be used concurrently by the same client. This simplifies
 * the driver code.
 *
 * The first thing to keep in mind is that there is a flag for complete
 * driver implementation: %IEEE80211_HW_AP_LINK_PS. If this flag is set,
 * mac80211 expects the driver to handle most of the state machine for
 * powersaving clients and will ignore the PM bit in incoming frames.
 * Drivers then use ieee80211_sta_ps_transition() to inform mac80211 of
 * stations' powersave transitions. In this mode, mac80211 also doesn't
 * handle PS-Poll/uAPSD.
 *
 * In the mode without %IEEE80211_HW_AP_LINK_PS, mac80211 will check the
 * PM bit in incoming frames for client powersave transitions. When a
 * station goes to sleep, we will stop transmitting to it. There is,
 * however, a race condition: a station might go to sleep while there is
 * data buffered on hardware queues. If the device has support for this
 * it will reject frames, and the driver should give the frames back to
 * mac80211 with the %IEEE80211_TX_STAT_TX_FILTERED flag set which will
 * cause mac80211 to retry the frame when the station wakes up. The
 * driver is also notified of powersave transitions by calling its
 * @sta_notify callback.
 *
 * When the station is asleep, it has three choices: it can wake up,
 * it can PS-Poll, or it can possibly start a uAPSD service period.
 * Waking up is implemented by simply transmitting all buffered (and
 * filtered) frames to the station. This is the easiest case. When
 * the station sends a PS-Poll or a uAPSD trigger frame, mac80211
 * will inform the driver of this with the @allow_buffered_frames
 * callback; this callback is optional. mac80211 will then transmit
1792
 * the frames as usual and set the %IEEE80211_TX_CTL_NO_PS_BUFFER
1793 1794 1795 1796 1797 1798 1799
 * on each frame. The last frame in the service period (or the only
 * response to a PS-Poll) also has %IEEE80211_TX_STATUS_EOSP set to
 * indicate that it ends the service period; as this frame must have
 * TX status report it also sets %IEEE80211_TX_CTL_REQ_TX_STATUS.
 * When TX status is reported for this frame, the service period is
 * marked has having ended and a new one can be started by the peer.
 *
1800 1801 1802
 * Additionally, non-bufferable MMPDUs can also be transmitted by
 * mac80211 with the %IEEE80211_TX_CTL_NO_PS_BUFFER set in them.
 *
1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844
 * Another race condition can happen on some devices like iwlwifi
 * when there are frames queued for the station and it wakes up
 * or polls; the frames that are already queued could end up being
 * transmitted first instead, causing reordering and/or wrong
 * processing of the EOSP. The cause is that allowing frames to be
 * transmitted to a certain station is out-of-band communication to
 * the device. To allow this problem to be solved, the driver can
 * call ieee80211_sta_block_awake() if frames are buffered when it
 * is notified that the station went to sleep. When all these frames
 * have been filtered (see above), it must call the function again
 * to indicate that the station is no longer blocked.
 *
 * If the driver buffers frames in the driver for aggregation in any
 * way, it must use the ieee80211_sta_set_buffered() call when it is
 * notified of the station going to sleep to inform mac80211 of any
 * TIDs that have frames buffered. Note that when a station wakes up
 * this information is reset (hence the requirement to call it when
 * informed of the station going to sleep). Then, when a service
 * period starts for any reason, @release_buffered_frames is called
 * with the number of frames to be released and which TIDs they are
 * to come from. In this case, the driver is responsible for setting
 * the EOSP (for uAPSD) and MORE_DATA bits in the released frames,
 * to help the @more_data paramter is passed to tell the driver if
 * there is more data on other TIDs -- the TIDs to release frames
 * from are ignored since mac80211 doesn't know how many frames the
 * buffers for those TIDs contain.
 *
 * If the driver also implement GO mode, where absence periods may
 * shorten service periods (or abort PS-Poll responses), it must
 * filter those response frames except in the case of frames that
 * are buffered in the driver -- those must remain buffered to avoid
 * reordering. Because it is possible that no frames are released
 * in this case, the driver must call ieee80211_sta_eosp_irqsafe()
 * to indicate to mac80211 that the service period ended anyway.
 *
 * Finally, if frames from multiple TIDs are released from mac80211
 * but the driver might reorder them, it must clear & set the flags
 * appropriately (only the last frame may have %IEEE80211_TX_STATUS_EOSP)
 * and also take care of the EOSP and MORE_DATA bits in the frame.
 * The driver may also use ieee80211_sta_eosp_irqsafe() in this case.
 */

1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
/**
 * DOC: HW queue control
 *
 * Before HW queue control was introduced, mac80211 only had a single static
 * assignment of per-interface AC software queues to hardware queues. This
 * was problematic for a few reasons:
 * 1) off-channel transmissions might get stuck behind other frames
 * 2) multiple virtual interfaces couldn't be handled correctly
 * 3) after-DTIM frames could get stuck behind other frames
 *
 * To solve this, hardware typically uses multiple different queues for all
 * the different usages, and this needs to be propagated into mac80211 so it
 * won't have the same problem with the software queues.
 *
 * Therefore, mac80211 now offers the %IEEE80211_HW_QUEUE_CONTROL capability
 * flag that tells it that the driver implements its own queue control. To do
 * so, the driver will set up the various queues in each &struct ieee80211_vif
 * and the offchannel queue in &struct ieee80211_hw. In response, mac80211 will
 * use those queue IDs in the hw_queue field of &struct ieee80211_tx_info and
 * if necessary will queue the frame on the right software queue that mirrors
 * the hardware queue.
 * Additionally, the driver has to then use these HW queue IDs for the queue
 * management functions (ieee80211_stop_queue() et al.)
 *
 * The driver is free to set up the queue mappings as needed, multiple virtual
 * interfaces may map to the same hardware queues if needed. The setup has to
 * happen during add_interface or change_interface callbacks. For example, a
 * driver supporting station+station and station+AP modes might decide to have
 * 10 hardware queues to handle different scenarios:
 *
 * 4 AC HW queues for 1st vif: 0, 1, 2, 3
 * 4 AC HW queues for 2nd vif: 4, 5, 6, 7
 * after-DTIM queue for AP:   8
 * off-channel queue:         9
 *
 * It would then set up the hardware like this:
 *   hw.offchannel_tx_hw_queue = 9
 *
 * and the first virtual interface that is added as follows:
 *   vif.hw_queue[IEEE80211_AC_VO] = 0
 *   vif.hw_queue[IEEE80211_AC_VI] = 1
 *   vif.hw_queue[IEEE80211_AC_BE] = 2
 *   vif.hw_queue[IEEE80211_AC_BK] = 3
 *   vif.cab_queue = 8 // if AP mode, otherwise %IEEE80211_INVAL_HW_QUEUE
 * and the second virtual interface with 4-7.
 *
 * If queue 6 gets full, for example, mac80211 would only stop the second
 * virtual interface's BE queue since virtual interface queues are per AC.
 *
 * Note that the vif.cab_queue value should be set to %IEEE80211_INVAL_HW_QUEUE
 * whenever the queue is not used (i.e. the interface is not in AP mode) if the
 * queue could potentially be shared since mac80211 will look at cab_queue when
 * a queue is stopped/woken even if the interface is not in AP mode.
 */

1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927
/**
 * enum ieee80211_filter_flags - hardware filter flags
 *
 * These flags determine what the filter in hardware should be
 * programmed to let through and what should not be passed to the
 * stack. It is always safe to pass more frames than requested,
 * but this has negative impact on power consumption.
 *
 * @FIF_PROMISC_IN_BSS: promiscuous mode within your BSS,
 *	think of the BSS as your network segment and then this corresponds
 *	to the regular ethernet device promiscuous mode.
 *
 * @FIF_ALLMULTI: pass all multicast frames, this is used if requested
 *	by the user or if the hardware is not capable of filtering by
 *	multicast address.
 *
 * @FIF_FCSFAIL: pass frames with failed FCS (but you need to set the
 *	%RX_FLAG_FAILED_FCS_CRC for them)
 *
 * @FIF_PLCPFAIL: pass frames with failed PLCP CRC (but you need to set
 *	the %RX_FLAG_FAILED_PLCP_CRC for them
 *
 * @FIF_BCN_PRBRESP_PROMISC: This flag is set during scanning to indicate
 *	to the hardware that it should not filter beacons or probe responses
 *	by BSSID. Filtering them can greatly reduce the amount of processing
 *	mac80211 needs to do and the amount of CPU wakeups, so you should
 *	honour this flag if possible.
 *
I
Igor Perminov 已提交
1928
 * @FIF_CONTROL: pass control frames (except for PS Poll), if PROMISC_IN_BSS
1929
 * 	is not set then only those addressed to this station.
1930 1931
 *
 * @FIF_OTHER_BSS: pass frames destined to other BSSes
I
Igor Perminov 已提交
1932
 *
1933 1934 1935 1936
 * @FIF_PSPOLL: pass PS Poll frames, if PROMISC_IN_BSS is not set then only
 * 	those addressed to this station.
 *
 * @FIF_PROBE_REQ: pass probe request frames
1937
 */
1938 1939 1940 1941 1942 1943 1944 1945
enum ieee80211_filter_flags {
	FIF_PROMISC_IN_BSS	= 1<<0,
	FIF_ALLMULTI		= 1<<1,
	FIF_FCSFAIL		= 1<<2,
	FIF_PLCPFAIL		= 1<<3,
	FIF_BCN_PRBRESP_PROMISC	= 1<<4,
	FIF_CONTROL		= 1<<5,
	FIF_OTHER_BSS		= 1<<6,
I
Igor Perminov 已提交
1946
	FIF_PSPOLL		= 1<<7,
1947
	FIF_PROBE_REQ		= 1<<8,
1948 1949
};

1950 1951 1952 1953 1954
/**
 * enum ieee80211_ampdu_mlme_action - A-MPDU actions
 *
 * These flags are used with the ampdu_action() callback in
 * &struct ieee80211_ops to indicate which action is needed.
1955 1956 1957
 *
 * Note that drivers MUST be able to deal with a TX aggregation
 * session being stopped even before they OK'ed starting it by
1958
 * calling ieee80211_start_tx_ba_cb_irqsafe, because the peer
1959 1960
 * might receive the addBA frame and send a delBA right away!
 *
1961 1962
 * @IEEE80211_AMPDU_RX_START: start Rx aggregation
 * @IEEE80211_AMPDU_RX_STOP: stop Rx aggregation
1963 1964
 * @IEEE80211_AMPDU_TX_START: start Tx aggregation
 * @IEEE80211_AMPDU_TX_STOP: stop Tx aggregation
1965
 * @IEEE80211_AMPDU_TX_OPERATIONAL: TX aggregation has become operational
1966 1967 1968 1969
 */
enum ieee80211_ampdu_mlme_action {
	IEEE80211_AMPDU_RX_START,
	IEEE80211_AMPDU_RX_STOP,
1970 1971
	IEEE80211_AMPDU_TX_START,
	IEEE80211_AMPDU_TX_STOP,
1972
	IEEE80211_AMPDU_TX_OPERATIONAL,
1973
};
1974

1975 1976 1977
/**
 * enum ieee80211_frame_release_type - frame release reason
 * @IEEE80211_FRAME_RELEASE_PSPOLL: frame released for PS-Poll
J
Johannes Berg 已提交
1978 1979
 * @IEEE80211_FRAME_RELEASE_UAPSD: frame(s) released due to
 *	frame received on trigger-enabled AC
1980 1981 1982
 */
enum ieee80211_frame_release_type {
	IEEE80211_FRAME_RELEASE_PSPOLL,
J
Johannes Berg 已提交
1983
	IEEE80211_FRAME_RELEASE_UAPSD,
1984 1985
};

1986 1987 1988 1989 1990 1991
/**
 * enum ieee80211_rate_control_changed - flags to indicate what changed
 *
 * @IEEE80211_RC_BW_CHANGED: The bandwidth that can be used to transmit
 *	to this station changed.
 * @IEEE80211_RC_SMPS_CHANGED: The SMPS state of the station changed.
1992 1993 1994
 * @IEEE80211_RC_SUPP_RATES_CHANGED: The supported rate set of this peer
 *	changed (in IBSS mode) due to discovering more information about
 *	the peer.
1995 1996 1997 1998
 */
enum ieee80211_rate_control_changed {
	IEEE80211_RC_BW_CHANGED		= BIT(0),
	IEEE80211_RC_SMPS_CHANGED	= BIT(1),
1999
	IEEE80211_RC_SUPP_RATES_CHANGED	= BIT(2),
2000 2001
};

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
/**
 * struct ieee80211_ops - callbacks from mac80211 to the driver
 *
 * This structure contains various callbacks that the driver may
 * handle or, in some cases, must handle, for example to configure
 * the hardware to a new channel or to transmit a frame.
 *
 * @tx: Handler that 802.11 module calls for each transmitted frame.
 *	skb contains the buffer starting from the IEEE 802.11 header.
 *	The low-level driver should send the frame out based on
2012
 *	configuration in the TX control data. This handler should,
2013 2014
 *	preferably, never fail and stop queues appropriately.
 *	Must be atomic.
2015 2016 2017 2018 2019 2020 2021 2022 2023
 *
 * @start: Called before the first netdevice attached to the hardware
 *	is enabled. This should turn on the hardware and must turn on
 *	frame reception (for possibly enabled monitor interfaces.)
 *	Returns negative error codes, these may be seen in userspace,
 *	or zero.
 *	When the device is started it should not have a MAC address
 *	to avoid acknowledging frames before a non-monitor device
 *	is added.
2024
 *	Must be implemented and can sleep.
2025 2026 2027 2028 2029
 *
 * @stop: Called after last netdevice attached to the hardware
 *	is disabled. This should turn off the hardware (at least
 *	it must turn off frame reception.)
 *	May be called right after add_interface if that rejects
2030 2031
 *	an interface. If you added any work onto the mac80211 workqueue
 *	you should ensure to cancel it on this callback.
2032
 *	Must be implemented and can sleep.
2033
 *
2034 2035 2036 2037 2038
 * @suspend: Suspend the device; mac80211 itself will quiesce before and
 *	stop transmitting and doing any other configuration, and then
 *	ask the device to suspend. This is only invoked when WoWLAN is
 *	configured, otherwise the device is deconfigured completely and
 *	reconfigured at resume time.
2039 2040 2041 2042
 *	The driver may also impose special conditions under which it
 *	wants to use the "normal" suspend (deconfigure), say if it only
 *	supports WoWLAN when the device is associated. In this case, it
 *	must return 1 from this function.
2043 2044 2045 2046 2047 2048 2049
 *
 * @resume: If WoWLAN was configured, this indicates that mac80211 is
 *	now resuming its operation, after this the device must be fully
 *	functional again. If this returns an error, the only way out is
 *	to also unregister the device. If it returns 1, then mac80211
 *	will also go through the regular complete restart on resume.
 *
2050 2051 2052 2053 2054
 * @set_wakeup: Enable or disable wakeup when WoWLAN configuration is
 *	modified. The reason is that device_set_wakeup_enable() is
 *	supposed to be called when the configuration changes, not only
 *	in suspend().
 *
2055
 * @add_interface: Called when a netdevice attached to the hardware is
2056
 *	enabled. Because it is not called for monitor mode devices, @start
2057 2058 2059 2060 2061 2062
 *	and @stop must be implemented.
 *	The driver should perform any initialization it needs before
 *	the device can be enabled. The initial configuration for the
 *	interface is given in the conf parameter.
 *	The callback may refuse to add an interface by returning a
 *	negative error code (which will be seen in userspace.)
2063
 *	Must be implemented and can sleep.
2064
 *
2065 2066 2067 2068 2069 2070
 * @change_interface: Called when a netdevice changes type. This callback
 *	is optional, but only if it is supported can interface types be
 *	switched while the interface is UP. The callback may sleep.
 *	Note that while an interface is being switched, it will not be
 *	found by the interface iteration callbacks.
 *
2071 2072 2073 2074 2075 2076 2077
 * @remove_interface: Notifies a driver that an interface is going down.
 *	The @stop callback is called after this if it is the last interface
 *	and no monitor interfaces are present.
 *	When all interfaces are removed, the MAC address in the hardware
 *	must be cleared so the device no longer acknowledges packets,
 *	the mac_addr member of the conf structure is, however, set to the
 *	MAC address of the device going away.
2078
 *	Hence, this callback must be implemented. It can sleep.
2079 2080 2081
 *
 * @config: Handler for configuration requests. IEEE 802.11 code calls this
 *	function to change hardware configuration, e.g., channel.
2082
 *	This function should never fail but returns a negative error code
2083
 *	if it does. The callback can sleep.
2084
 *
2085 2086 2087 2088 2089
 * @bss_info_changed: Handler for configuration requests related to BSS
 *	parameters that may vary during BSS's lifespan, and may affect low
 *	level driver (e.g. assoc/disassoc status, erp parameters).
 *	This function should not be used if no BSS has been set, unless
 *	for association indication. The @changed parameter indicates which
2090 2091
 *	of the bss parameters has changed when a call is made. The callback
 *	can sleep.
2092
 *
2093 2094 2095 2096
 * @prepare_multicast: Prepare for multicast filter configuration.
 *	This callback is optional, and its return value is passed
 *	to configure_filter(). This callback must be atomic.
 *
2097 2098
 * @configure_filter: Configure the device's RX filter.
 *	See the section "Frame filtering" for more information.
2099
 *	This callback must be implemented and can sleep.
2100
 *
2101
 * @set_tim: Set TIM bit. mac80211 calls this function when a TIM bit
2102
 * 	must be set or cleared for a given STA. Must be atomic.
2103 2104
 *
 * @set_key: See the section "Hardware crypto acceleration"
2105 2106
 *	This callback is only called between add_interface and
 *	remove_interface calls, i.e. while the given virtual interface
2107
 *	is enabled.
2108
 *	Returns a negative error code if the key can't be added.
2109
 *	The callback can sleep.
2110
 *
2111 2112 2113
 * @update_tkip_key: See the section "Hardware crypto acceleration"
 * 	This callback will be called in the context of Rx. Called for drivers
 * 	which set IEEE80211_KEY_FLAG_TKIP_REQ_RX_P1_KEY.
2114
 *	The callback must be atomic.
2115
 *
2116 2117 2118 2119 2120 2121
 * @set_rekey_data: If the device supports GTK rekeying, for example while the
 *	host is suspended, it can assign this callback to retrieve the data
 *	necessary to do GTK rekeying, this is the KEK, KCK and replay counter.
 *	After rekeying was done it should (for example during resume) notify
 *	userspace of the new replay counter using ieee80211_gtk_rekey_notify().
 *
2122
 * @hw_scan: Ask the hardware to service the scan request, no need to start
2123
 *	the scan state machine in stack. The scan must honour the channel
2124 2125
 *	configuration done by the regulatory agent in the wiphy's
 *	registered bands. The hardware (or the driver) needs to make sure
2126 2127 2128 2129 2130 2131 2132 2133
 *	that power save is disabled.
 *	The @req ie/ie_len members are rewritten by mac80211 to contain the
 *	entire IEs after the SSID, so that drivers need not look at these
 *	at all but just send them after the SSID -- mac80211 includes the
 *	(extended) supported rates and HT information (where applicable).
 *	When the scan finishes, ieee80211_scan_completed() must be called;
 *	note that it also must be called when the scan cannot finish due to
 *	any error unless this callback returned a negative error code.
2134
 *	The callback can sleep.
2135
 *
2136 2137 2138 2139 2140 2141 2142 2143
 * @cancel_hw_scan: Ask the low-level tp cancel the active hw scan.
 *	The driver should ask the hardware to cancel the scan (if possible),
 *	but the scan will be completed only after the driver will call
 *	ieee80211_scan_completed().
 *	This callback is needed for wowlan, to prevent enqueueing a new
 *	scan_work after the low-level driver was already suspended.
 *	The callback can sleep.
 *
2144 2145 2146 2147 2148 2149 2150
 * @sched_scan_start: Ask the hardware to start scanning repeatedly at
 *	specific intervals.  The driver must call the
 *	ieee80211_sched_scan_results() function whenever it finds results.
 *	This process will continue until sched_scan_stop is called.
 *
 * @sched_scan_stop: Tell the hardware to stop an ongoing scheduled scan.
 *
2151 2152
 * @sw_scan_start: Notifier function that is called just before a software scan
 *	is started. Can be NULL, if the driver doesn't need this notification.
2153
 *	The callback can sleep.
2154
 *
2155 2156 2157 2158
 * @sw_scan_complete: Notifier function that is called just after a
 *	software scan finished. Can be NULL, if the driver doesn't need
 *	this notification.
 *	The callback can sleep.
2159
 *
2160 2161
 * @get_stats: Return low-level statistics.
 * 	Returns zero if statistics are available.
2162
 *	The callback can sleep.
2163
 *
2164 2165 2166
 * @get_tkip_seq: If your device implements TKIP encryption in hardware this
 *	callback should be provided to read the TKIP transmit IVs (both IV32
 *	and IV16) for the given key from hardware.
2167
 *	The callback must be atomic.
2168
 *
2169 2170 2171 2172 2173
 * @set_frag_threshold: Configuration of fragmentation threshold. Assign this
 *	if the device does fragmentation by itself; if this callback is
 *	implemented then the stack will not do fragmentation.
 *	The callback can sleep.
 *
2174
 * @set_rts_threshold: Configuration of RTS threshold (if device needs it)
2175
 *	The callback can sleep.
2176
 *
2177 2178 2179 2180 2181 2182 2183
 * @sta_add: Notifies low level driver about addition of an associated station,
 *	AP, IBSS/WDS/mesh peer etc. This callback can sleep.
 *
 * @sta_remove: Notifies low level driver about removal of an associated
 *	station, AP, IBSS/WDS/mesh peer etc. This callback can sleep.
 *
 * @sta_notify: Notifies low level driver about power state transition of an
2184 2185 2186
 *	associated station, AP,  IBSS/WDS/mesh peer etc. For a VIF operating
 *	in AP mode, this callback will not be called when the flag
 *	%IEEE80211_HW_AP_LINK_PS is set. Must be atomic.
2187
 *
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2188 2189 2190 2191 2192 2193 2194
 * @sta_state: Notifies low level driver about state transition of a
 *	station (which can be the AP, a client, IBSS/WDS/mesh peer etc.)
 *	This callback is mutually exclusive with @sta_add/@sta_remove.
 *	It must not fail for down transitions but may fail for transitions
 *	up the list of states.
 *	The callback can sleep.
 *
2195 2196 2197 2198 2199 2200 2201 2202
 * @sta_rc_update: Notifies the driver of changes to the bitrates that can be
 *	used to transmit to the station. The changes are advertised with bits
 *	from &enum ieee80211_rate_control_changed and the values are reflected
 *	in the station data. This callback should only be used when the driver
 *	uses hardware rate control (%IEEE80211_HW_HAS_RATE_CONTROL) since
 *	otherwise the rate control algorithm is notified directly.
 *	Must be atomic.
 *
2203
 * @conf_tx: Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
2204
 *	bursting) for a hardware TX queue.
2205
 *	Returns a negative error code on failure.
2206
 *	The callback can sleep.
2207 2208
 *
 * @get_tsf: Get the current TSF timer value from firmware/hardware. Currently,
2209
 *	this is only used for IBSS mode BSSID merging and debugging. Is not a
2210
 *	required function.
2211
 *	The callback can sleep.
2212 2213 2214
 *
 * @set_tsf: Set the TSF timer to the specified value in the firmware/hardware.
 *      Currently, this is only used for IBSS mode debugging. Is not a
2215
 *	required function.
2216
 *	The callback can sleep.
2217 2218 2219 2220 2221
 *
 * @reset_tsf: Reset the TSF timer and allow firmware/hardware to synchronize
 *	with other STAs in the IBSS. This is only used in IBSS mode. This
 *	function is optional if the firmware/hardware takes full care of
 *	TSF synchronization.
2222
 *	The callback can sleep.
2223 2224 2225 2226
 *
 * @tx_last_beacon: Determine whether the last IBSS beacon was sent by us.
 *	This is needed only for IBSS mode and the result of this function is
 *	used to determine whether to reply to Probe Requests.
2227
 *	Returns non-zero if this device sent the last beacon.
2228
 *	The callback can sleep.
2229
 *
2230 2231 2232 2233
 * @ampdu_action: Perform a certain A-MPDU action
 * 	The RA/TID combination determines the destination and TID we want
 * 	the ampdu action to be performed for. The action is defined through
 * 	ieee80211_ampdu_mlme_action. Starting sequence number (@ssn)
2234
 * 	is the first frame we expect to perform the action on. Notice
2235
 * 	that TX/RX_STOP can pass NULL for this parameter.
2236 2237
 *	The @buf_size parameter is only valid when the action is set to
 *	%IEEE80211_AMPDU_TX_OPERATIONAL and indicates the peer's reorder
2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250
 *	buffer size (number of subframes) for this session -- the driver
 *	may neither send aggregates containing more subframes than this
 *	nor send aggregates in a way that lost frames would exceed the
 *	buffer size. If just limiting the aggregate size, this would be
 *	possible with a buf_size of 8:
 *	 - TX: 1.....7
 *	 - RX:  2....7 (lost frame #1)
 *	 - TX:        8..1...
 *	which is invalid since #1 was now re-transmitted well past the
 *	buffer size of 8. Correct ways to retransmit #1 would be:
 *	 - TX:       1 or 18 or 81
 *	Even "189" would be wrong since 1 could be lost again.
 *
2251
 *	Returns a negative error code on failure.
2252
 *	The callback can sleep.
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2253
 *
2254 2255
 * @get_survey: Return per-channel survey information
 *
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2256 2257 2258
 * @rfkill_poll: Poll rfkill hardware state. If you need this, you also
 *	need to set wiphy->rfkill_poll to %true before registration,
 *	and need to call wiphy_rfkill_set_hw_state() in the callback.
2259
 *	The callback can sleep.
2260
 *
2261 2262 2263 2264
 * @set_coverage_class: Set slot time for given coverage class as specified
 *	in IEEE 802.11-2007 section 17.3.8.6 and modify ACK timeout
 *	accordingly. This callback is not required and may sleep.
 *
2265
 * @testmode_cmd: Implement a cfg80211 test mode command.
2266
 *	The callback can sleep.
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Wey-Yi Guy 已提交
2267
 * @testmode_dump: Implement a cfg80211 test mode dump. The callback can sleep.
2268 2269 2270
 *
 * @flush: Flush all pending frames from the hardware queue, making sure
 *	that the hardware queues are empty. If the parameter @drop is set
2271
 *	to %true, pending frames may be dropped. The callback can sleep.
2272 2273 2274 2275 2276
 *
 * @channel_switch: Drivers that need (or want) to offload the channel
 *	switch operation for CSAs received from the AP may implement this
 *	callback. They must then call ieee80211_chswitch_done() to indicate
 *	completion of the channel switch.
2277 2278
 *
 * @napi_poll: Poll Rx queue for incoming data frames.
2279 2280 2281 2282 2283 2284 2285
 *
 * @set_antenna: Set antenna configuration (tx_ant, rx_ant) on the device.
 *	Parameters are bitmaps of allowed antennas to use for TX/RX. Drivers may
 *	reject TX/RX mask combinations they cannot support by returning -EINVAL
 *	(also see nl80211.h @NL80211_ATTR_WIPHY_ANTENNA_TX).
 *
 * @get_antenna: Get current antenna configuration from device (tx_ant, rx_ant).
2286 2287 2288 2289 2290 2291 2292
 *
 * @remain_on_channel: Starts an off-channel period on the given channel, must
 *	call back to ieee80211_ready_on_channel() when on that channel. Note
 *	that normal channel traffic is not stopped as this is intended for hw
 *	offload. Frames to transmit on the off-channel channel are transmitted
 *	normally except for the %IEEE80211_TX_CTL_TX_OFFCHAN flag. When the
 *	duration (which will always be non-zero) expires, the driver must call
2293 2294 2295 2296
 *	ieee80211_remain_on_channel_expired().
 *	Note that this callback may be called while the device is in IDLE and
 *	must be accepted in this case.
 *	This callback may sleep.
2297 2298
 * @cancel_remain_on_channel: Requests that an ongoing off-channel period is
 *	aborted before it expires. This callback may sleep.
2299 2300 2301 2302
 *
 * @set_ringparam: Set tx and rx ring sizes.
 *
 * @get_ringparam: Get tx and rx ring current and maximum sizes.
2303 2304 2305
 *
 * @tx_frames_pending: Check if there is any pending frame in the hardware
 *	queues before entering power save.
2306 2307 2308 2309
 *
 * @set_bitrate_mask: Set a mask of rates to be used for rate control selection
 *	when transmitting a frame. Currently only legacy rates are handled.
 *	The callback can sleep.
2310 2311
 * @rssi_callback: Notify driver when the average RSSI goes above/below
 *	thresholds that were registered previously. The callback can sleep.
2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323
 *
 * @release_buffered_frames: Release buffered frames according to the given
 *	parameters. In the case where the driver buffers some frames for
 *	sleeping stations mac80211 will use this callback to tell the driver
 *	to release some frames, either for PS-poll or uAPSD.
 *	Note that if the @more_data paramter is %false the driver must check
 *	if there are more frames on the given TIDs, and if there are more than
 *	the frames being released then it must still set the more-data bit in
 *	the frame. If the @more_data parameter is %true, then of course the
 *	more-data bit must always be set.
 *	The @tids parameter tells the driver which TIDs to release frames
 *	from, for PS-poll it will always have only a single bit set.
2324 2325 2326 2327 2328 2329
 *	In the case this is used for a PS-poll initiated release, the
 *	@num_frames parameter will always be 1 so code can be shared. In
 *	this case the driver must also set %IEEE80211_TX_STATUS_EOSP flag
 *	on the TX status (and must report TX status) so that the PS-poll
 *	period is properly ended. This is used to avoid sending multiple
 *	responses for a retried PS-poll frame.
2330 2331 2332
 *	In the case this is used for uAPSD, the @num_frames parameter may be
 *	bigger than one, but the driver may send fewer frames (it must send
 *	at least one, however). In this case it is also responsible for
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Johannes Berg 已提交
2333 2334
 *	setting the EOSP flag in the QoS header of the frames. Also, when the
 *	service period ends, the driver must set %IEEE80211_TX_STATUS_EOSP
2335 2336
 *	on the last frame in the SP. Alternatively, it may call the function
 *	ieee80211_sta_eosp_irqsafe() to inform mac80211 of the end of the SP.
2337
 *	This callback must be atomic.
2338 2339 2340
 * @allow_buffered_frames: Prepare device to allow the given number of frames
 *	to go out to the given station. The frames will be sent by mac80211
 *	via the usual TX path after this call. The TX information for frames
2341
 *	released will also have the %IEEE80211_TX_CTL_NO_PS_BUFFER flag set
2342 2343 2344 2345
 *	and the last one will also have %IEEE80211_TX_STATUS_EOSP set. In case
 *	frames from multiple TIDs are released and the driver might reorder
 *	them between the TIDs, it must set the %IEEE80211_TX_STATUS_EOSP flag
 *	on the last frame and clear it on all others and also handle the EOSP
2346 2347
 *	bit in the QoS header correctly. Alternatively, it can also call the
 *	ieee80211_sta_eosp_irqsafe() function.
2348 2349 2350
 *	The @tids parameter is a bitmap and tells the driver which TIDs the
 *	frames will be on; it will at most have two bits set.
 *	This callback must be atomic.
2351 2352 2353 2354 2355 2356 2357 2358
 *
 * @get_et_sset_count:  Ethtool API to get string-set count.
 *
 * @get_et_stats:  Ethtool API to get a set of u64 stats.
 *
 * @get_et_strings:  Ethtool API to get a set of strings to describe stats
 *	and perhaps other supported types of ethtool data-sets.
 *
2359 2360 2361
 * @get_rssi: Get current signal strength in dBm, the function is optional
 *	and can sleep.
 *
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2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
 * @mgd_prepare_tx: Prepare for transmitting a management frame for association
 *	before associated. In multi-channel scenarios, a virtual interface is
 *	bound to a channel before it is associated, but as it isn't associated
 *	yet it need not necessarily be given airtime, in particular since any
 *	transmission to a P2P GO needs to be synchronized against the GO's
 *	powersave state. mac80211 will call this function before transmitting a
 *	management frame prior to having successfully associated to allow the
 *	driver to give it channel time for the transmission, to get a response
 *	and to be able to synchronize with the GO.
 *	The callback will be called before each transmission and upon return
 *	mac80211 will transmit the frame right away.
 *	The callback is optional and can (should!) sleep.
2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
 *
 * @add_chanctx: Notifies device driver about new channel context creation.
 * @remove_chanctx: Notifies device driver about channel context destruction.
 * @change_chanctx: Notifies device driver about channel context changes that
 *	may happen when combining different virtual interfaces on the same
 *	channel context with different settings
 * @assign_vif_chanctx: Notifies device driver about channel context being bound
 *	to vif. Possible use is for hw queue remapping.
 * @unassign_vif_chanctx: Notifies device driver about channel context being
 *	unbound from vif.
2384
 */
2385
struct ieee80211_ops {
2386 2387 2388
	void (*tx)(struct ieee80211_hw *hw,
		   struct ieee80211_tx_control *control,
		   struct sk_buff *skb);
2389 2390
	int (*start)(struct ieee80211_hw *hw);
	void (*stop)(struct ieee80211_hw *hw);
2391 2392 2393
#ifdef CONFIG_PM
	int (*suspend)(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan);
	int (*resume)(struct ieee80211_hw *hw);
2394
	void (*set_wakeup)(struct ieee80211_hw *hw, bool enabled);
2395
#endif
2396
	int (*add_interface)(struct ieee80211_hw *hw,
2397
			     struct ieee80211_vif *vif);
2398 2399
	int (*change_interface)(struct ieee80211_hw *hw,
				struct ieee80211_vif *vif,
2400
				enum nl80211_iftype new_type, bool p2p);
2401
	void (*remove_interface)(struct ieee80211_hw *hw,
2402
				 struct ieee80211_vif *vif);
2403
	int (*config)(struct ieee80211_hw *hw, u32 changed);
2404 2405 2406 2407
	void (*bss_info_changed)(struct ieee80211_hw *hw,
				 struct ieee80211_vif *vif,
				 struct ieee80211_bss_conf *info,
				 u32 changed);
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Johannes Berg 已提交
2408

2409
	u64 (*prepare_multicast)(struct ieee80211_hw *hw,
2410
				 struct netdev_hw_addr_list *mc_list);
2411 2412 2413
	void (*configure_filter)(struct ieee80211_hw *hw,
				 unsigned int changed_flags,
				 unsigned int *total_flags,
2414
				 u64 multicast);
2415 2416
	int (*set_tim)(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
		       bool set);
2417
	int (*set_key)(struct ieee80211_hw *hw, enum set_key_cmd cmd,
2418
		       struct ieee80211_vif *vif, struct ieee80211_sta *sta,
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Johannes Berg 已提交
2419
		       struct ieee80211_key_conf *key);
2420
	void (*update_tkip_key)(struct ieee80211_hw *hw,
2421 2422 2423 2424
				struct ieee80211_vif *vif,
				struct ieee80211_key_conf *conf,
				struct ieee80211_sta *sta,
				u32 iv32, u16 *phase1key);
2425 2426 2427
	void (*set_rekey_data)(struct ieee80211_hw *hw,
			       struct ieee80211_vif *vif,
			       struct cfg80211_gtk_rekey_data *data);
2428
	int (*hw_scan)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2429
		       struct cfg80211_scan_request *req);
2430 2431
	void (*cancel_hw_scan)(struct ieee80211_hw *hw,
			       struct ieee80211_vif *vif);
2432 2433 2434 2435 2436 2437
	int (*sched_scan_start)(struct ieee80211_hw *hw,
				struct ieee80211_vif *vif,
				struct cfg80211_sched_scan_request *req,
				struct ieee80211_sched_scan_ies *ies);
	void (*sched_scan_stop)(struct ieee80211_hw *hw,
			       struct ieee80211_vif *vif);
2438 2439
	void (*sw_scan_start)(struct ieee80211_hw *hw);
	void (*sw_scan_complete)(struct ieee80211_hw *hw);
2440 2441
	int (*get_stats)(struct ieee80211_hw *hw,
			 struct ieee80211_low_level_stats *stats);
2442 2443
	void (*get_tkip_seq)(struct ieee80211_hw *hw, u8 hw_key_idx,
			     u32 *iv32, u16 *iv16);
2444
	int (*set_frag_threshold)(struct ieee80211_hw *hw, u32 value);
2445
	int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value);
2446 2447 2448 2449
	int (*sta_add)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
		       struct ieee80211_sta *sta);
	int (*sta_remove)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
			  struct ieee80211_sta *sta);
2450
	void (*sta_notify)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2451
			enum sta_notify_cmd, struct ieee80211_sta *sta);
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Johannes Berg 已提交
2452 2453 2454 2455
	int (*sta_state)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
			 struct ieee80211_sta *sta,
			 enum ieee80211_sta_state old_state,
			 enum ieee80211_sta_state new_state);
2456 2457 2458 2459
	void (*sta_rc_update)(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif,
			      struct ieee80211_sta *sta,
			      u32 changed);
2460
	int (*conf_tx)(struct ieee80211_hw *hw,
2461
		       struct ieee80211_vif *vif, u16 ac,
2462
		       const struct ieee80211_tx_queue_params *params);
2463 2464 2465 2466
	u64 (*get_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
	void (*set_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
			u64 tsf);
	void (*reset_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
2467
	int (*tx_last_beacon)(struct ieee80211_hw *hw);
2468
	int (*ampdu_action)(struct ieee80211_hw *hw,
2469
			    struct ieee80211_vif *vif,
2470
			    enum ieee80211_ampdu_mlme_action action,
2471 2472
			    struct ieee80211_sta *sta, u16 tid, u16 *ssn,
			    u8 buf_size);
2473 2474
	int (*get_survey)(struct ieee80211_hw *hw, int idx,
		struct survey_info *survey);
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Johannes Berg 已提交
2475
	void (*rfkill_poll)(struct ieee80211_hw *hw);
2476
	void (*set_coverage_class)(struct ieee80211_hw *hw, u8 coverage_class);
2477 2478
#ifdef CONFIG_NL80211_TESTMODE
	int (*testmode_cmd)(struct ieee80211_hw *hw, void *data, int len);
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Wey-Yi Guy 已提交
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	int (*testmode_dump)(struct ieee80211_hw *hw, struct sk_buff *skb,
			     struct netlink_callback *cb,
			     void *data, int len);
2482
#endif
2483
	void (*flush)(struct ieee80211_hw *hw, bool drop);
2484 2485
	void (*channel_switch)(struct ieee80211_hw *hw,
			       struct ieee80211_channel_switch *ch_switch);
2486
	int (*napi_poll)(struct ieee80211_hw *hw, int budget);
2487 2488
	int (*set_antenna)(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant);
	int (*get_antenna)(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant);
2489 2490 2491 2492 2493 2494

	int (*remain_on_channel)(struct ieee80211_hw *hw,
				 struct ieee80211_channel *chan,
				 enum nl80211_channel_type channel_type,
				 int duration);
	int (*cancel_remain_on_channel)(struct ieee80211_hw *hw);
2495 2496 2497
	int (*set_ringparam)(struct ieee80211_hw *hw, u32 tx, u32 rx);
	void (*get_ringparam)(struct ieee80211_hw *hw,
			      u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max);
2498
	bool (*tx_frames_pending)(struct ieee80211_hw *hw);
2499 2500
	int (*set_bitrate_mask)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
				const struct cfg80211_bitrate_mask *mask);
2501 2502
	void (*rssi_callback)(struct ieee80211_hw *hw,
			      enum ieee80211_rssi_event rssi_event);
2503

2504 2505 2506 2507 2508
	void (*allow_buffered_frames)(struct ieee80211_hw *hw,
				      struct ieee80211_sta *sta,
				      u16 tids, int num_frames,
				      enum ieee80211_frame_release_type reason,
				      bool more_data);
2509 2510 2511 2512 2513
	void (*release_buffered_frames)(struct ieee80211_hw *hw,
					struct ieee80211_sta *sta,
					u16 tids, int num_frames,
					enum ieee80211_frame_release_type reason,
					bool more_data);
2514 2515 2516 2517 2518 2519 2520 2521 2522

	int	(*get_et_sset_count)(struct ieee80211_hw *hw,
				     struct ieee80211_vif *vif, int sset);
	void	(*get_et_stats)(struct ieee80211_hw *hw,
				struct ieee80211_vif *vif,
				struct ethtool_stats *stats, u64 *data);
	void	(*get_et_strings)(struct ieee80211_hw *hw,
				  struct ieee80211_vif *vif,
				  u32 sset, u8 *data);
2523 2524
	int	(*get_rssi)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
			    struct ieee80211_sta *sta, s8 *rssi_dbm);
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Johannes Berg 已提交
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	void	(*mgd_prepare_tx)(struct ieee80211_hw *hw,
				  struct ieee80211_vif *vif);
2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541

	int (*add_chanctx)(struct ieee80211_hw *hw,
			   struct ieee80211_chanctx_conf *ctx);
	void (*remove_chanctx)(struct ieee80211_hw *hw,
			       struct ieee80211_chanctx_conf *ctx);
	void (*change_chanctx)(struct ieee80211_hw *hw,
			       struct ieee80211_chanctx_conf *ctx,
			       u32 changed);
	int (*assign_vif_chanctx)(struct ieee80211_hw *hw,
				  struct ieee80211_vif *vif,
				  struct ieee80211_chanctx_conf *ctx);
	void (*unassign_vif_chanctx)(struct ieee80211_hw *hw,
				     struct ieee80211_vif *vif,
				     struct ieee80211_chanctx_conf *ctx);
2542 2543
};

2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554
/**
 * ieee80211_alloc_hw -  Allocate a new hardware device
 *
 * This must be called once for each hardware device. The returned pointer
 * must be used to refer to this device when calling other functions.
 * mac80211 allocates a private data area for the driver pointed to by
 * @priv in &struct ieee80211_hw, the size of this area is given as
 * @priv_data_len.
 *
 * @priv_data_len: length of private data
 * @ops: callbacks for this device
2555 2556 2557 2558
 */
struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
					const struct ieee80211_ops *ops);

2559 2560 2561
/**
 * ieee80211_register_hw - Register hardware device
 *
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Johannes Berg 已提交
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 * You must call this function before any other functions in
 * mac80211. Note that before a hardware can be registered, you
 * need to fill the contained wiphy's information.
2565 2566 2567
 *
 * @hw: the device to register as returned by ieee80211_alloc_hw()
 */
2568 2569
int ieee80211_register_hw(struct ieee80211_hw *hw);

2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580
/**
 * struct ieee80211_tpt_blink - throughput blink description
 * @throughput: throughput in Kbit/sec
 * @blink_time: blink time in milliseconds
 *	(full cycle, ie. one off + one on period)
 */
struct ieee80211_tpt_blink {
	int throughput;
	int blink_time;
};

2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593
/**
 * enum ieee80211_tpt_led_trigger_flags - throughput trigger flags
 * @IEEE80211_TPT_LEDTRIG_FL_RADIO: enable blinking with radio
 * @IEEE80211_TPT_LEDTRIG_FL_WORK: enable blinking when working
 * @IEEE80211_TPT_LEDTRIG_FL_CONNECTED: enable blinking when at least one
 *	interface is connected in some way, including being an AP
 */
enum ieee80211_tpt_led_trigger_flags {
	IEEE80211_TPT_LEDTRIG_FL_RADIO		= BIT(0),
	IEEE80211_TPT_LEDTRIG_FL_WORK		= BIT(1),
	IEEE80211_TPT_LEDTRIG_FL_CONNECTED	= BIT(2),
};

2594 2595 2596
#ifdef CONFIG_MAC80211_LEDS
extern char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw);
extern char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw);
2597
extern char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw);
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Ivo van Doorn 已提交
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extern char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw);
2599
extern char *__ieee80211_create_tpt_led_trigger(
2600
				struct ieee80211_hw *hw, unsigned int flags,
2601 2602
				const struct ieee80211_tpt_blink *blink_table,
				unsigned int blink_table_len);
2603
#endif
2604 2605 2606 2607 2608 2609 2610 2611 2612 2613
/**
 * ieee80211_get_tx_led_name - get name of TX LED
 *
 * mac80211 creates a transmit LED trigger for each wireless hardware
 * that can be used to drive LEDs if your driver registers a LED device.
 * This function returns the name (or %NULL if not configured for LEDs)
 * of the trigger so you can automatically link the LED device.
 *
 * @hw: the hardware to get the LED trigger name for
 */
2614 2615 2616 2617 2618 2619 2620 2621 2622
static inline char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
{
#ifdef CONFIG_MAC80211_LEDS
	return __ieee80211_get_tx_led_name(hw);
#else
	return NULL;
#endif
}

2623 2624 2625 2626 2627 2628 2629 2630 2631 2632
/**
 * ieee80211_get_rx_led_name - get name of RX LED
 *
 * mac80211 creates a receive LED trigger for each wireless hardware
 * that can be used to drive LEDs if your driver registers a LED device.
 * This function returns the name (or %NULL if not configured for LEDs)
 * of the trigger so you can automatically link the LED device.
 *
 * @hw: the hardware to get the LED trigger name for
 */
2633 2634 2635 2636 2637 2638 2639 2640 2641
static inline char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
{
#ifdef CONFIG_MAC80211_LEDS
	return __ieee80211_get_rx_led_name(hw);
#else
	return NULL;
#endif
}

I
Ivo van Doorn 已提交
2642 2643 2644 2645 2646 2647 2648 2649 2650 2651
/**
 * ieee80211_get_assoc_led_name - get name of association LED
 *
 * mac80211 creates a association LED trigger for each wireless hardware
 * that can be used to drive LEDs if your driver registers a LED device.
 * This function returns the name (or %NULL if not configured for LEDs)
 * of the trigger so you can automatically link the LED device.
 *
 * @hw: the hardware to get the LED trigger name for
 */
2652 2653 2654 2655 2656 2657 2658 2659 2660
static inline char *ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
{
#ifdef CONFIG_MAC80211_LEDS
	return __ieee80211_get_assoc_led_name(hw);
#else
	return NULL;
#endif
}

I
Ivo van Doorn 已提交
2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678
/**
 * ieee80211_get_radio_led_name - get name of radio LED
 *
 * mac80211 creates a radio change LED trigger for each wireless hardware
 * that can be used to drive LEDs if your driver registers a LED device.
 * This function returns the name (or %NULL if not configured for LEDs)
 * of the trigger so you can automatically link the LED device.
 *
 * @hw: the hardware to get the LED trigger name for
 */
static inline char *ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
{
#ifdef CONFIG_MAC80211_LEDS
	return __ieee80211_get_radio_led_name(hw);
#else
	return NULL;
#endif
}
2679

2680 2681 2682
/**
 * ieee80211_create_tpt_led_trigger - create throughput LED trigger
 * @hw: the hardware to create the trigger for
2683
 * @flags: trigger flags, see &enum ieee80211_tpt_led_trigger_flags
2684 2685 2686 2687 2688 2689 2690 2691
 * @blink_table: the blink table -- needs to be ordered by throughput
 * @blink_table_len: size of the blink table
 *
 * This function returns %NULL (in case of error, or if no LED
 * triggers are configured) or the name of the new trigger.
 * This function must be called before ieee80211_register_hw().
 */
static inline char *
2692
ieee80211_create_tpt_led_trigger(struct ieee80211_hw *hw, unsigned int flags,
2693 2694 2695 2696
				 const struct ieee80211_tpt_blink *blink_table,
				 unsigned int blink_table_len)
{
#ifdef CONFIG_MAC80211_LEDS
2697
	return __ieee80211_create_tpt_led_trigger(hw, flags, blink_table,
2698 2699 2700 2701 2702 2703
						  blink_table_len);
#else
	return NULL;
#endif
}

2704 2705 2706 2707 2708 2709 2710 2711
/**
 * ieee80211_unregister_hw - Unregister a hardware device
 *
 * This function instructs mac80211 to free allocated resources
 * and unregister netdevices from the networking subsystem.
 *
 * @hw: the hardware to unregister
 */
2712 2713
void ieee80211_unregister_hw(struct ieee80211_hw *hw);

2714 2715 2716 2717 2718
/**
 * ieee80211_free_hw - free hardware descriptor
 *
 * This function frees everything that was allocated, including the
 * private data for the driver. You must call ieee80211_unregister_hw()
R
Randy Dunlap 已提交
2719
 * before calling this function.
2720 2721 2722
 *
 * @hw: the hardware to free
 */
2723 2724
void ieee80211_free_hw(struct ieee80211_hw *hw);

2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738
/**
 * ieee80211_restart_hw - restart hardware completely
 *
 * Call this function when the hardware was restarted for some reason
 * (hardware error, ...) and the driver is unable to restore its state
 * by itself. mac80211 assumes that at this point the driver/hardware
 * is completely uninitialised and stopped, it starts the process by
 * calling the ->start() operation. The driver will need to reset all
 * internal state that it has prior to calling this function.
 *
 * @hw: the hardware to restart
 */
void ieee80211_restart_hw(struct ieee80211_hw *hw);

2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754
/** ieee80211_napi_schedule - schedule NAPI poll
 *
 * Use this function to schedule NAPI polling on a device.
 *
 * @hw: the hardware to start polling
 */
void ieee80211_napi_schedule(struct ieee80211_hw *hw);

/** ieee80211_napi_complete - complete NAPI polling
 *
 * Use this function to finish NAPI polling on a device.
 *
 * @hw: the hardware to stop polling
 */
void ieee80211_napi_complete(struct ieee80211_hw *hw);

2755 2756 2757 2758
/**
 * ieee80211_rx - receive frame
 *
 * Use this function to hand received frames to mac80211. The receive
Z
Zhu Yi 已提交
2759 2760 2761 2762
 * buffer in @skb must start with an IEEE 802.11 header. In case of a
 * paged @skb is used, the driver is recommended to put the ieee80211
 * header of the frame on the linear part of the @skb to avoid memory
 * allocation and/or memcpy by the stack.
2763
 *
2764
 * This function may not be called in IRQ context. Calls to this function
K
Kalle Valo 已提交
2765 2766 2767
 * for a single hardware must be synchronized against each other. Calls to
 * this function, ieee80211_rx_ni() and ieee80211_rx_irqsafe() may not be
 * mixed for a single hardware.
2768
 *
K
Kalle Valo 已提交
2769
 * In process context use instead ieee80211_rx_ni().
2770
 *
2771 2772 2773
 * @hw: the hardware this frame came in on
 * @skb: the buffer to receive, owned by mac80211 after this call
 */
2774
void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb);
2775 2776 2777 2778 2779

/**
 * ieee80211_rx_irqsafe - receive frame
 *
 * Like ieee80211_rx() but can be called in IRQ context
2780 2781
 * (internally defers to a tasklet.)
 *
K
Kalle Valo 已提交
2782 2783
 * Calls to this function, ieee80211_rx() or ieee80211_rx_ni() may not
 * be mixed for a single hardware.
2784 2785 2786 2787
 *
 * @hw: the hardware this frame came in on
 * @skb: the buffer to receive, owned by mac80211 after this call
 */
2788
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb);
2789

K
Kalle Valo 已提交
2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809
/**
 * ieee80211_rx_ni - receive frame (in process context)
 *
 * Like ieee80211_rx() but can be called in process context
 * (internally disables bottom halves).
 *
 * Calls to this function, ieee80211_rx() and ieee80211_rx_irqsafe() may
 * not be mixed for a single hardware.
 *
 * @hw: the hardware this frame came in on
 * @skb: the buffer to receive, owned by mac80211 after this call
 */
static inline void ieee80211_rx_ni(struct ieee80211_hw *hw,
				   struct sk_buff *skb)
{
	local_bh_disable();
	ieee80211_rx(hw, skb);
	local_bh_enable();
}

2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851
/**
 * ieee80211_sta_ps_transition - PS transition for connected sta
 *
 * When operating in AP mode with the %IEEE80211_HW_AP_LINK_PS
 * flag set, use this function to inform mac80211 about a connected station
 * entering/leaving PS mode.
 *
 * This function may not be called in IRQ context or with softirqs enabled.
 *
 * Calls to this function for a single hardware must be synchronized against
 * each other.
 *
 * The function returns -EINVAL when the requested PS mode is already set.
 *
 * @sta: currently connected sta
 * @start: start or stop PS
 */
int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start);

/**
 * ieee80211_sta_ps_transition_ni - PS transition for connected sta
 *                                  (in process context)
 *
 * Like ieee80211_sta_ps_transition() but can be called in process context
 * (internally disables bottom halves). Concurrent call restriction still
 * applies.
 *
 * @sta: currently connected sta
 * @start: start or stop PS
 */
static inline int ieee80211_sta_ps_transition_ni(struct ieee80211_sta *sta,
						  bool start)
{
	int ret;

	local_bh_disable();
	ret = ieee80211_sta_ps_transition(sta, start);
	local_bh_enable();

	return ret;
}

2852 2853 2854 2855
/*
 * The TX headroom reserved by mac80211 for its own tx_status functions.
 * This is enough for the radiotap header.
 */
2856
#define IEEE80211_TX_STATUS_HEADROOM	14
2857

2858
/**
2859
 * ieee80211_sta_set_buffered - inform mac80211 about driver-buffered frames
2860
 * @sta: &struct ieee80211_sta pointer for the sleeping station
2861 2862
 * @tid: the TID that has buffered frames
 * @buffered: indicates whether or not frames are buffered for this TID
2863 2864
 *
 * If a driver buffers frames for a powersave station instead of passing
2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887
 * them back to mac80211 for retransmission, the station may still need
 * to be told that there are buffered frames via the TIM bit.
 *
 * This function informs mac80211 whether or not there are frames that are
 * buffered in the driver for a given TID; mac80211 can then use this data
 * to set the TIM bit (NOTE: This may call back into the driver's set_tim
 * call! Beware of the locking!)
 *
 * If all frames are released to the station (due to PS-poll or uAPSD)
 * then the driver needs to inform mac80211 that there no longer are
 * frames buffered. However, when the station wakes up mac80211 assumes
 * that all buffered frames will be transmitted and clears this data,
 * drivers need to make sure they inform mac80211 about all buffered
 * frames on the sleep transition (sta_notify() with %STA_NOTIFY_SLEEP).
 *
 * Note that technically mac80211 only needs to know this per AC, not per
 * TID, but since driver buffering will inevitably happen per TID (since
 * it is related to aggregation) it is easier to make mac80211 map the
 * TID to the AC as required instead of keeping track in all drivers that
 * use this API.
 */
void ieee80211_sta_set_buffered(struct ieee80211_sta *sta,
				u8 tid, bool buffered);
2888

2889 2890 2891 2892 2893 2894 2895
/**
 * ieee80211_tx_status - transmit status callback
 *
 * Call this function for all transmitted frames after they have been
 * transmitted. It is permissible to not call this function for
 * multicast frames but this can affect statistics.
 *
2896 2897
 * This function may not be called in IRQ context. Calls to this function
 * for a single hardware must be synchronized against each other. Calls
2898 2899
 * to this function, ieee80211_tx_status_ni() and ieee80211_tx_status_irqsafe()
 * may not be mixed for a single hardware.
2900
 *
2901 2902 2903
 * @hw: the hardware the frame was transmitted by
 * @skb: the frame that was transmitted, owned by mac80211 after this call
 */
2904
void ieee80211_tx_status(struct ieee80211_hw *hw,
2905
			 struct sk_buff *skb);
2906

2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
/**
 * ieee80211_tx_status_ni - transmit status callback (in process context)
 *
 * Like ieee80211_tx_status() but can be called in process context.
 *
 * Calls to this function, ieee80211_tx_status() and
 * ieee80211_tx_status_irqsafe() may not be mixed
 * for a single hardware.
 *
 * @hw: the hardware the frame was transmitted by
 * @skb: the frame that was transmitted, owned by mac80211 after this call
 */
static inline void ieee80211_tx_status_ni(struct ieee80211_hw *hw,
					  struct sk_buff *skb)
{
	local_bh_disable();
	ieee80211_tx_status(hw, skb);
	local_bh_enable();
}

2927
/**
R
Randy Dunlap 已提交
2928
 * ieee80211_tx_status_irqsafe - IRQ-safe transmit status callback
2929 2930 2931 2932
 *
 * Like ieee80211_tx_status() but can be called in IRQ context
 * (internally defers to a tasklet.)
 *
2933 2934
 * Calls to this function, ieee80211_tx_status() and
 * ieee80211_tx_status_ni() may not be mixed for a single hardware.
2935 2936 2937 2938
 *
 * @hw: the hardware the frame was transmitted by
 * @skb: the frame that was transmitted, owned by mac80211 after this call
 */
2939
void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
2940
				 struct sk_buff *skb);
2941

2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952
/**
 * ieee80211_report_low_ack - report non-responding station
 *
 * When operating in AP-mode, call this function to report a non-responding
 * connected STA.
 *
 * @sta: the non-responding connected sta
 * @num_packets: number of packets sent to @sta without a response
 */
void ieee80211_report_low_ack(struct ieee80211_sta *sta, u32 num_packets);

2953
/**
2954
 * ieee80211_beacon_get_tim - beacon generation function
2955
 * @hw: pointer obtained from ieee80211_alloc_hw().
2956
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
2957 2958 2959 2960 2961 2962 2963 2964
 * @tim_offset: pointer to variable that will receive the TIM IE offset.
 *	Set to 0 if invalid (in non-AP modes).
 * @tim_length: pointer to variable that will receive the TIM IE length,
 *	(including the ID and length bytes!).
 *	Set to 0 if invalid (in non-AP modes).
 *
 * If the driver implements beaconing modes, it must use this function to
 * obtain the beacon frame/template.
2965 2966
 *
 * If the beacon frames are generated by the host system (i.e., not in
2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983
 * hardware/firmware), the driver uses this function to get each beacon
 * frame from mac80211 -- it is responsible for calling this function
 * before the beacon is needed (e.g. based on hardware interrupt).
 *
 * If the beacon frames are generated by the device, then the driver
 * must use the returned beacon as the template and change the TIM IE
 * according to the current DTIM parameters/TIM bitmap.
 *
 * The driver is responsible for freeing the returned skb.
 */
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length);

/**
 * ieee80211_beacon_get - beacon generation function
 * @hw: pointer obtained from ieee80211_alloc_hw().
2984
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
2985 2986
 *
 * See ieee80211_beacon_get_tim().
2987
 */
2988 2989 2990 2991 2992
static inline struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
						   struct ieee80211_vif *vif)
{
	return ieee80211_beacon_get_tim(hw, vif, NULL, NULL);
}
2993

2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006
/**
 * ieee80211_proberesp_get - retrieve a Probe Response template
 * @hw: pointer obtained from ieee80211_alloc_hw().
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 *
 * Creates a Probe Response template which can, for example, be uploaded to
 * hardware. The destination address should be set by the caller.
 *
 * Can only be called in AP mode.
 */
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif);

3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036
/**
 * ieee80211_pspoll_get - retrieve a PS Poll template
 * @hw: pointer obtained from ieee80211_alloc_hw().
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 *
 * Creates a PS Poll a template which can, for example, uploaded to
 * hardware. The template must be updated after association so that correct
 * AID, BSSID and MAC address is used.
 *
 * Note: Caller (or hardware) is responsible for setting the
 * &IEEE80211_FCTL_PM bit.
 */
struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
				     struct ieee80211_vif *vif);

/**
 * ieee80211_nullfunc_get - retrieve a nullfunc template
 * @hw: pointer obtained from ieee80211_alloc_hw().
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 *
 * Creates a Nullfunc template which can, for example, uploaded to
 * hardware. The template must be updated after association so that correct
 * BSSID and address is used.
 *
 * Note: Caller (or hardware) is responsible for setting the
 * &IEEE80211_FCTL_PM bit as well as Duration and Sequence Control fields.
 */
struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif);

3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053
/**
 * ieee80211_probereq_get - retrieve a Probe Request template
 * @hw: pointer obtained from ieee80211_alloc_hw().
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 * @ssid: SSID buffer
 * @ssid_len: length of SSID
 * @ie: buffer containing all IEs except SSID for the template
 * @ie_len: length of the IE buffer
 *
 * Creates a Probe Request template which can, for example, be uploaded to
 * hardware.
 */
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
				       const u8 *ie, size_t ie_len);

3054 3055 3056
/**
 * ieee80211_rts_get - RTS frame generation function
 * @hw: pointer obtained from ieee80211_alloc_hw().
3057
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
3058 3059
 * @frame: pointer to the frame that is going to be protected by the RTS.
 * @frame_len: the frame length (in octets).
3060
 * @frame_txctl: &struct ieee80211_tx_info of the frame.
3061 3062 3063 3064 3065 3066 3067
 * @rts: The buffer where to store the RTS frame.
 *
 * If the RTS frames are generated by the host system (i.e., not in
 * hardware/firmware), the low-level driver uses this function to receive
 * the next RTS frame from the 802.11 code. The low-level is responsible
 * for calling this function before and RTS frame is needed.
 */
3068
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3069
		       const void *frame, size_t frame_len,
3070
		       const struct ieee80211_tx_info *frame_txctl,
3071 3072 3073 3074 3075
		       struct ieee80211_rts *rts);

/**
 * ieee80211_rts_duration - Get the duration field for an RTS frame
 * @hw: pointer obtained from ieee80211_alloc_hw().
3076
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
3077
 * @frame_len: the length of the frame that is going to be protected by the RTS.
3078
 * @frame_txctl: &struct ieee80211_tx_info of the frame.
3079 3080 3081 3082 3083
 *
 * If the RTS is generated in firmware, but the host system must provide
 * the duration field, the low-level driver uses this function to receive
 * the duration field value in little-endian byteorder.
 */
3084 3085
__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, size_t frame_len,
3086
			      const struct ieee80211_tx_info *frame_txctl);
3087 3088 3089 3090

/**
 * ieee80211_ctstoself_get - CTS-to-self frame generation function
 * @hw: pointer obtained from ieee80211_alloc_hw().
3091
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
3092 3093
 * @frame: pointer to the frame that is going to be protected by the CTS-to-self.
 * @frame_len: the frame length (in octets).
3094
 * @frame_txctl: &struct ieee80211_tx_info of the frame.
3095 3096 3097 3098 3099 3100 3101
 * @cts: The buffer where to store the CTS-to-self frame.
 *
 * If the CTS-to-self frames are generated by the host system (i.e., not in
 * hardware/firmware), the low-level driver uses this function to receive
 * the next CTS-to-self frame from the 802.11 code. The low-level is responsible
 * for calling this function before and CTS-to-self frame is needed.
 */
3102 3103
void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
			     struct ieee80211_vif *vif,
3104
			     const void *frame, size_t frame_len,
3105
			     const struct ieee80211_tx_info *frame_txctl,
3106 3107 3108 3109 3110
			     struct ieee80211_cts *cts);

/**
 * ieee80211_ctstoself_duration - Get the duration field for a CTS-to-self frame
 * @hw: pointer obtained from ieee80211_alloc_hw().
3111
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
3112
 * @frame_len: the length of the frame that is going to be protected by the CTS-to-self.
3113
 * @frame_txctl: &struct ieee80211_tx_info of the frame.
3114 3115 3116 3117 3118
 *
 * If the CTS-to-self is generated in firmware, but the host system must provide
 * the duration field, the low-level driver uses this function to receive
 * the duration field value in little-endian byteorder.
 */
3119 3120
__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
				    struct ieee80211_vif *vif,
3121
				    size_t frame_len,
3122
				    const struct ieee80211_tx_info *frame_txctl);
3123 3124 3125 3126

/**
 * ieee80211_generic_frame_duration - Calculate the duration field for a frame
 * @hw: pointer obtained from ieee80211_alloc_hw().
3127
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
3128
 * @band: the band to calculate the frame duration on
3129
 * @frame_len: the length of the frame.
3130
 * @rate: the rate at which the frame is going to be transmitted.
3131 3132 3133 3134
 *
 * Calculate the duration field of some generic frame, given its
 * length and transmission rate (in 100kbps).
 */
3135 3136
__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif,
3137
					enum ieee80211_band band,
3138
					size_t frame_len,
3139
					struct ieee80211_rate *rate);
3140 3141 3142 3143

/**
 * ieee80211_get_buffered_bc - accessing buffered broadcast and multicast frames
 * @hw: pointer as obtained from ieee80211_alloc_hw().
3144
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161
 *
 * Function for accessing buffered broadcast and multicast frames. If
 * hardware/firmware does not implement buffering of broadcast/multicast
 * frames when power saving is used, 802.11 code buffers them in the host
 * memory. The low-level driver uses this function to fetch next buffered
 * frame. In most cases, this is used when generating beacon frame. This
 * function returns a pointer to the next buffered skb or NULL if no more
 * buffered frames are available.
 *
 * Note: buffered frames are returned only after DTIM beacon frame was
 * generated with ieee80211_beacon_get() and the low-level driver must thus
 * call ieee80211_beacon_get() first. ieee80211_get_buffered_bc() returns
 * NULL if the previous generated beacon was not DTIM, so the low-level driver
 * does not need to check for DTIM beacons separately and should be able to
 * use common code for all beacons.
 */
struct sk_buff *
3162
ieee80211_get_buffered_bc(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
3163

3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175
/**
 * ieee80211_get_tkip_p1k_iv - get a TKIP phase 1 key for IV32
 *
 * This function returns the TKIP phase 1 key for the given IV32.
 *
 * @keyconf: the parameter passed with the set key
 * @iv32: IV32 to get the P1K for
 * @p1k: a buffer to which the key will be written, as 5 u16 values
 */
void ieee80211_get_tkip_p1k_iv(struct ieee80211_key_conf *keyconf,
			       u32 iv32, u16 *p1k);

3176
/**
3177 3178 3179 3180 3181 3182 3183 3184 3185 3186
 * ieee80211_get_tkip_p1k - get a TKIP phase 1 key
 *
 * This function returns the TKIP phase 1 key for the IV32 taken
 * from the given packet.
 *
 * @keyconf: the parameter passed with the set key
 * @skb: the packet to take the IV32 value from that will be encrypted
 *	with this P1K
 * @p1k: a buffer to which the key will be written, as 5 u16 values
 */
3187 3188 3189 3190 3191 3192 3193 3194 3195
static inline void ieee80211_get_tkip_p1k(struct ieee80211_key_conf *keyconf,
					  struct sk_buff *skb, u16 *p1k)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	const u8 *data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
	u32 iv32 = get_unaligned_le32(&data[4]);

	ieee80211_get_tkip_p1k_iv(keyconf, iv32, p1k);
}
3196

3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210
/**
 * ieee80211_get_tkip_rx_p1k - get a TKIP phase 1 key for RX
 *
 * This function returns the TKIP phase 1 key for the given IV32
 * and transmitter address.
 *
 * @keyconf: the parameter passed with the set key
 * @ta: TA that will be used with the key
 * @iv32: IV32 to get the P1K for
 * @p1k: a buffer to which the key will be written, as 5 u16 values
 */
void ieee80211_get_tkip_rx_p1k(struct ieee80211_key_conf *keyconf,
			       const u8 *ta, u32 iv32, u16 *p1k);

3211 3212
/**
 * ieee80211_get_tkip_p2k - get a TKIP phase 2 key
3213
 *
3214 3215
 * This function computes the TKIP RC4 key for the IV values
 * in the packet.
3216 3217
 *
 * @keyconf: the parameter passed with the set key
3218 3219 3220
 * @skb: the packet to take the IV32/IV16 values from that will be
 *	encrypted with this key
 * @p2k: a buffer to which the key will be written, 16 bytes
3221
 */
3222 3223
void ieee80211_get_tkip_p2k(struct ieee80211_key_conf *keyconf,
			    struct sk_buff *skb, u8 *p2k);
3224

3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237
/**
 * ieee80211_aes_cmac_calculate_k1_k2 - calculate the AES-CMAC sub keys
 *
 * This function computes the two AES-CMAC sub-keys, based on the
 * previously installed master key.
 *
 * @keyconf: the parameter passed with the set key
 * @k1: a buffer to be filled with the 1st sub-key
 * @k2: a buffer to be filled with the 2nd sub-key
 */
void ieee80211_aes_cmac_calculate_k1_k2(struct ieee80211_key_conf *keyconf,
					u8 *k1, u8 *k2);

3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297
/**
 * struct ieee80211_key_seq - key sequence counter
 *
 * @tkip: TKIP data, containing IV32 and IV16 in host byte order
 * @ccmp: PN data, most significant byte first (big endian,
 *	reverse order than in packet)
 * @aes_cmac: PN data, most significant byte first (big endian,
 *	reverse order than in packet)
 */
struct ieee80211_key_seq {
	union {
		struct {
			u32 iv32;
			u16 iv16;
		} tkip;
		struct {
			u8 pn[6];
		} ccmp;
		struct {
			u8 pn[6];
		} aes_cmac;
	};
};

/**
 * ieee80211_get_key_tx_seq - get key TX sequence counter
 *
 * @keyconf: the parameter passed with the set key
 * @seq: buffer to receive the sequence data
 *
 * This function allows a driver to retrieve the current TX IV/PN
 * for the given key. It must not be called if IV generation is
 * offloaded to the device.
 *
 * Note that this function may only be called when no TX processing
 * can be done concurrently, for example when queues are stopped
 * and the stop has been synchronized.
 */
void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
			      struct ieee80211_key_seq *seq);

/**
 * ieee80211_get_key_rx_seq - get key RX sequence counter
 *
 * @keyconf: the parameter passed with the set key
 * @tid: The TID, or -1 for the management frame value (CCMP only);
 *	the value on TID 0 is also used for non-QoS frames. For
 *	CMAC, only TID 0 is valid.
 * @seq: buffer to receive the sequence data
 *
 * This function allows a driver to retrieve the current RX IV/PNs
 * for the given key. It must not be called if IV checking is done
 * by the device and not by mac80211.
 *
 * Note that this function may only be called when no RX processing
 * can be done concurrently.
 */
void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
			      int tid, struct ieee80211_key_seq *seq);

3298 3299 3300 3301 3302 3303 3304 3305 3306 3307
/**
 * ieee80211_gtk_rekey_notify - notify userspace supplicant of rekeying
 * @vif: virtual interface the rekeying was done on
 * @bssid: The BSSID of the AP, for checking association
 * @replay_ctr: the new replay counter after GTK rekeying
 * @gfp: allocation flags
 */
void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
				const u8 *replay_ctr, gfp_t gfp);

3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325
/**
 * ieee80211_wake_queue - wake specific queue
 * @hw: pointer as obtained from ieee80211_alloc_hw().
 * @queue: queue number (counted from zero).
 *
 * Drivers should use this function instead of netif_wake_queue.
 */
void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue);

/**
 * ieee80211_stop_queue - stop specific queue
 * @hw: pointer as obtained from ieee80211_alloc_hw().
 * @queue: queue number (counted from zero).
 *
 * Drivers should use this function instead of netif_stop_queue.
 */
void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue);

3326 3327 3328 3329 3330 3331 3332 3333 3334 3335
/**
 * ieee80211_queue_stopped - test status of the queue
 * @hw: pointer as obtained from ieee80211_alloc_hw().
 * @queue: queue number (counted from zero).
 *
 * Drivers should use this function instead of netif_stop_queue.
 */

int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue);

3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351
/**
 * ieee80211_stop_queues - stop all queues
 * @hw: pointer as obtained from ieee80211_alloc_hw().
 *
 * Drivers should use this function instead of netif_stop_queue.
 */
void ieee80211_stop_queues(struct ieee80211_hw *hw);

/**
 * ieee80211_wake_queues - wake all queues
 * @hw: pointer as obtained from ieee80211_alloc_hw().
 *
 * Drivers should use this function instead of netif_wake_queue.
 */
void ieee80211_wake_queues(struct ieee80211_hw *hw);

3352 3353 3354 3355 3356
/**
 * ieee80211_scan_completed - completed hardware scan
 *
 * When hardware scan offload is used (i.e. the hw_scan() callback is
 * assigned) this function needs to be called by the driver to notify
3357 3358
 * mac80211 that the scan finished. This function can be called from
 * any context, including hardirq context.
3359 3360
 *
 * @hw: the hardware that finished the scan
3361
 * @aborted: set to true if scan was aborted
3362
 */
3363
void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted);
3364

3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386
/**
 * ieee80211_sched_scan_results - got results from scheduled scan
 *
 * When a scheduled scan is running, this function needs to be called by the
 * driver whenever there are new scan results available.
 *
 * @hw: the hardware that is performing scheduled scans
 */
void ieee80211_sched_scan_results(struct ieee80211_hw *hw);

/**
 * ieee80211_sched_scan_stopped - inform that the scheduled scan has stopped
 *
 * When a scheduled scan is running, this function can be called by
 * the driver if it needs to stop the scan to perform another task.
 * Usual scenarios are drivers that cannot continue the scheduled scan
 * while associating, for instance.
 *
 * @hw: the hardware that is performing scheduled scans
 */
void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw);

3387
/**
R
Randy Dunlap 已提交
3388
 * ieee80211_iterate_active_interfaces - iterate active interfaces
3389 3390 3391
 *
 * This function iterates over the interfaces associated with a given
 * hardware that are currently active and calls the callback for them.
3392 3393 3394
 * This function allows the iterator function to sleep, when the iterator
 * function is atomic @ieee80211_iterate_active_interfaces_atomic can
 * be used.
3395
 * Does not iterate over a new interface during add_interface()
3396 3397
 *
 * @hw: the hardware struct of which the interfaces should be iterated over
3398
 * @iterator: the iterator function to call
3399 3400 3401 3402
 * @data: first argument of the iterator function
 */
void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
					 void (*iterator)(void *data, u8 *mac,
3403
						struct ieee80211_vif *vif),
3404 3405
					 void *data);

3406 3407 3408 3409 3410 3411 3412
/**
 * ieee80211_iterate_active_interfaces_atomic - iterate active interfaces
 *
 * This function iterates over the interfaces associated with a given
 * hardware that are currently active and calls the callback for them.
 * This function requires the iterator callback function to be atomic,
 * if that is not desired, use @ieee80211_iterate_active_interfaces instead.
3413
 * Does not iterate over a new interface during add_interface()
3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424
 *
 * @hw: the hardware struct of which the interfaces should be iterated over
 * @iterator: the iterator function to call, cannot sleep
 * @data: first argument of the iterator function
 */
void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw,
						void (*iterator)(void *data,
						    u8 *mac,
						    struct ieee80211_vif *vif),
						void *data);

3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449
/**
 * ieee80211_queue_work - add work onto the mac80211 workqueue
 *
 * Drivers and mac80211 use this to add work onto the mac80211 workqueue.
 * This helper ensures drivers are not queueing work when they should not be.
 *
 * @hw: the hardware struct for the interface we are adding work for
 * @work: the work we want to add onto the mac80211 workqueue
 */
void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work);

/**
 * ieee80211_queue_delayed_work - add work onto the mac80211 workqueue
 *
 * Drivers and mac80211 use this to queue delayed work onto the mac80211
 * workqueue.
 *
 * @hw: the hardware struct for the interface we are adding work for
 * @dwork: delayable work to queue onto the mac80211 workqueue
 * @delay: number of jiffies to wait before queueing
 */
void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
				  struct delayed_work *dwork,
				  unsigned long delay);

3450 3451
/**
 * ieee80211_start_tx_ba_session - Start a tx Block Ack session.
3452
 * @sta: the station for which to start a BA session
3453
 * @tid: the TID to BA on.
3454
 * @timeout: session timeout value (in TUs)
R
Randy Dunlap 已提交
3455 3456
 *
 * Return: success if addBA request was sent, failure otherwise
3457 3458 3459 3460 3461
 *
 * Although mac80211/low level driver/user space application can estimate
 * the need to start aggregation on a certain RA/TID, the session level
 * will be managed by the mac80211.
 */
3462 3463
int ieee80211_start_tx_ba_session(struct ieee80211_sta *sta, u16 tid,
				  u16 timeout);
3464 3465 3466

/**
 * ieee80211_start_tx_ba_cb_irqsafe - low level driver ready to aggregate.
3467
 * @vif: &struct ieee80211_vif pointer from the add_interface callback
3468 3469 3470 3471
 * @ra: receiver address of the BA session recipient.
 * @tid: the TID to BA on.
 *
 * This function must be called by low level driver once it has
3472 3473
 * finished with preparations for the BA session. It can be called
 * from any context.
3474
 */
3475
void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, const u8 *ra,
3476 3477 3478 3479
				      u16 tid);

/**
 * ieee80211_stop_tx_ba_session - Stop a Block Ack session.
3480
 * @sta: the station whose BA session to stop
3481
 * @tid: the TID to stop BA.
R
Randy Dunlap 已提交
3482
 *
3483
 * Return: negative error if the TID is invalid, or no aggregation active
3484 3485 3486 3487 3488
 *
 * Although mac80211/low level driver/user space application can estimate
 * the need to stop aggregation on a certain RA/TID, the session level
 * will be managed by the mac80211.
 */
3489
int ieee80211_stop_tx_ba_session(struct ieee80211_sta *sta, u16 tid);
3490 3491 3492

/**
 * ieee80211_stop_tx_ba_cb_irqsafe - low level driver ready to stop aggregate.
3493
 * @vif: &struct ieee80211_vif pointer from the add_interface callback
3494 3495 3496 3497
 * @ra: receiver address of the BA session recipient.
 * @tid: the desired TID to BA on.
 *
 * This function must be called by low level driver once it has
3498 3499
 * finished with preparations for the BA session tear down. It
 * can be called from any context.
3500
 */
3501
void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, const u8 *ra,
3502 3503
				     u16 tid);

3504 3505 3506
/**
 * ieee80211_find_sta - find a station
 *
3507
 * @vif: virtual interface to look for station on
3508 3509 3510 3511 3512
 * @addr: station's address
 *
 * This function must be called under RCU lock and the
 * resulting pointer is only valid under RCU lock as well.
 */
3513
struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
3514 3515
					 const u8 *addr);

3516
/**
3517
 * ieee80211_find_sta_by_ifaddr - find a station on hardware
3518 3519
 *
 * @hw: pointer as obtained from ieee80211_alloc_hw()
3520 3521
 * @addr: remote station's address
 * @localaddr: local address (vif->sdata->vif.addr). Use NULL for 'any'.
3522 3523 3524 3525
 *
 * This function must be called under RCU lock and the
 * resulting pointer is only valid under RCU lock as well.
 *
3526 3527 3528 3529 3530 3531 3532
 * NOTE: You may pass NULL for localaddr, but then you will just get
 *      the first STA that matches the remote address 'addr'.
 *      We can have multiple STA associated with multiple
 *      logical stations (e.g. consider a station connecting to another
 *      BSSID on the same AP hardware without disconnecting first).
 *      In this case, the result of this method with localaddr NULL
 *      is not reliable.
3533
 *
3534
 * DO NOT USE THIS FUNCTION with localaddr NULL if at all possible.
3535
 */
3536 3537 3538
struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
					       const u8 *addr,
					       const u8 *localaddr);
3539

3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571
/**
 * ieee80211_sta_block_awake - block station from waking up
 * @hw: the hardware
 * @pubsta: the station
 * @block: whether to block or unblock
 *
 * Some devices require that all frames that are on the queues
 * for a specific station that went to sleep are flushed before
 * a poll response or frames after the station woke up can be
 * delivered to that it. Note that such frames must be rejected
 * by the driver as filtered, with the appropriate status flag.
 *
 * This function allows implementing this mode in a race-free
 * manner.
 *
 * To do this, a driver must keep track of the number of frames
 * still enqueued for a specific station. If this number is not
 * zero when the station goes to sleep, the driver must call
 * this function to force mac80211 to consider the station to
 * be asleep regardless of the station's actual state. Once the
 * number of outstanding frames reaches zero, the driver must
 * call this function again to unblock the station. That will
 * cause mac80211 to be able to send ps-poll responses, and if
 * the station queried in the meantime then frames will also
 * be sent out as a result of this. Additionally, the driver
 * will be notified that the station woke up some time after
 * it is unblocked, regardless of whether the station actually
 * woke up while blocked or not.
 */
void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
			       struct ieee80211_sta *pubsta, bool block);

3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589
/**
 * ieee80211_sta_eosp - notify mac80211 about end of SP
 * @pubsta: the station
 *
 * When a device transmits frames in a way that it can't tell
 * mac80211 in the TX status about the EOSP, it must clear the
 * %IEEE80211_TX_STATUS_EOSP bit and call this function instead.
 * This applies for PS-Poll as well as uAPSD.
 *
 * Note that there is no non-_irqsafe version right now as
 * it wasn't needed, but just like _tx_status() and _rx()
 * must not be mixed in irqsafe/non-irqsafe versions, this
 * function must not be mixed with those either. Use the
 * all irqsafe, or all non-irqsafe, don't mix! If you need
 * the non-irqsafe version of this, you need to add it.
 */
void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta);

3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602
/**
 * ieee80211_iter_keys - iterate keys programmed into the device
 * @hw: pointer obtained from ieee80211_alloc_hw()
 * @vif: virtual interface to iterate, may be %NULL for all
 * @iter: iterator function that will be called for each key
 * @iter_data: custom data to pass to the iterator function
 *
 * This function can be used to iterate all the keys known to
 * mac80211, even those that weren't previously programmed into
 * the device. This is intended for use in WoWLAN if the device
 * needs reprogramming of the keys during suspend. Note that due
 * to locking reasons, it is also only safe to call this at few
 * spots since it must hold the RTNL and be able to sleep.
3603 3604 3605 3606
 *
 * The order in which the keys are iterated matches the order
 * in which they were originally installed and handed to the
 * set_key callback.
3607 3608 3609 3610 3611 3612 3613 3614 3615 3616
 */
void ieee80211_iter_keys(struct ieee80211_hw *hw,
			 struct ieee80211_vif *vif,
			 void (*iter)(struct ieee80211_hw *hw,
				      struct ieee80211_vif *vif,
				      struct ieee80211_sta *sta,
				      struct ieee80211_key_conf *key,
				      void *data),
			 void *iter_data);

3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637
/**
 * ieee80211_iter_chan_contexts_atomic - iterate channel contexts
 * @hw: pointre obtained from ieee80211_alloc_hw().
 * @iter: iterator function
 * @iter_data: data passed to iterator function
 *
 * Iterate all active channel contexts. This function is atomic and
 * doesn't acquire any locks internally that might be held in other
 * places while calling into the driver.
 *
 * The iterator will not find a context that's being added (during
 * the driver callback to add it) but will find it while it's being
 * removed.
 */
void ieee80211_iter_chan_contexts_atomic(
	struct ieee80211_hw *hw,
	void (*iter)(struct ieee80211_hw *hw,
		     struct ieee80211_chanctx_conf *chanctx_conf,
		     void *data),
	void *iter_data);

3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652
/**
 * ieee80211_ap_probereq_get - retrieve a Probe Request template
 * @hw: pointer obtained from ieee80211_alloc_hw().
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 *
 * Creates a Probe Request template which can, for example, be uploaded to
 * hardware. The template is filled with bssid, ssid and supported rate
 * information. This function must only be called from within the
 * .bss_info_changed callback function and only in managed mode. The function
 * is only useful when the interface is associated, otherwise it will return
 * NULL.
 */
struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
					  struct ieee80211_vif *vif);

3653 3654 3655
/**
 * ieee80211_beacon_loss - inform hardware does not receive beacons
 *
3656
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
3657
 *
3658
 * When beacon filtering is enabled with %IEEE80211_VIF_BEACON_FILTER and
3659
 * %IEEE80211_CONF_PS is set, the driver needs to inform whenever the
3660 3661 3662
 * hardware is not receiving beacons with this function.
 */
void ieee80211_beacon_loss(struct ieee80211_vif *vif);
3663

3664 3665 3666 3667 3668
/**
 * ieee80211_connection_loss - inform hardware has lost connection to the AP
 *
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 *
3669
 * When beacon filtering is enabled with %IEEE80211_VIF_BEACON_FILTER, and
3670 3671 3672 3673 3674 3675 3676 3677
 * %IEEE80211_CONF_PS and %IEEE80211_HW_CONNECTION_MONITOR are set, the driver
 * needs to inform if the connection to the AP has been lost.
 *
 * This function will cause immediate change to disassociated state,
 * without connection recovery attempts.
 */
void ieee80211_connection_loss(struct ieee80211_vif *vif);

3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700
/**
 * ieee80211_resume_disconnect - disconnect from AP after resume
 *
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 *
 * Instructs mac80211 to disconnect from the AP after resume.
 * Drivers can use this after WoWLAN if they know that the
 * connection cannot be kept up, for example because keys were
 * used while the device was asleep but the replay counters or
 * similar cannot be retrieved from the device during resume.
 *
 * Note that due to implementation issues, if the driver uses
 * the reconfiguration functionality during resume the interface
 * will still be added as associated first during resume and then
 * disconnect normally later.
 *
 * This function can only be called from the resume callback and
 * the driver must not be holding any of its own locks while it
 * calls this function, or at least not any locks it needs in the
 * key configuration paths (if it supports HW crypto).
 */
void ieee80211_resume_disconnect(struct ieee80211_vif *vif);

3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730
/**
 * ieee80211_disable_dyn_ps - force mac80211 to temporarily disable dynamic psm
 *
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 *
 * Some hardware require full power save to manage simultaneous BT traffic
 * on the WLAN frequency. Full PSM is required periodically, whenever there are
 * burst of BT traffic. The hardware gets information of BT traffic via
 * hardware co-existence lines, and consequentially requests mac80211 to
 * (temporarily) enter full psm.
 * This function will only temporarily disable dynamic PS, not enable PSM if
 * it was not already enabled.
 * The driver must make sure to re-enable dynamic PS using
 * ieee80211_enable_dyn_ps() if the driver has disabled it.
 *
 */
void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif);

/**
 * ieee80211_enable_dyn_ps - restore dynamic psm after being disabled
 *
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 *
 * This function restores dynamic PS after being temporarily disabled via
 * ieee80211_disable_dyn_ps(). Each ieee80211_disable_dyn_ps() call must
 * be coupled with an eventual call to this function.
 *
 */
void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif);

3731 3732 3733 3734 3735 3736 3737 3738
/**
 * ieee80211_cqm_rssi_notify - inform a configured connection quality monitoring
 *	rssi threshold triggered
 *
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 * @rssi_event: the RSSI trigger event type
 * @gfp: context flags
 *
3739
 * When the %IEEE80211_VIF_SUPPORTS_CQM_RSSI is set, and a connection quality
3740 3741 3742 3743 3744 3745 3746
 * monitoring is configured with an rssi threshold, the driver will inform
 * whenever the rssi level reaches the threshold.
 */
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
			       gfp_t gfp);

3747 3748 3749 3750 3751 3752 3753 3754 3755 3756
/**
 * ieee80211_chswitch_done - Complete channel switch process
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 * @success: make the channel switch successful or not
 *
 * Complete the channel switch post-process: set the new operational channel
 * and wake up the suspended queues.
 */
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success);

3757 3758 3759
/**
 * ieee80211_request_smps - request SM PS transition
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
J
Johannes Berg 已提交
3760
 * @smps_mode: new SM PS mode
3761 3762 3763 3764 3765 3766 3767 3768
 *
 * This allows the driver to request an SM PS transition in managed
 * mode. This is useful when the driver has more information than
 * the stack about possible interference, for example by bluetooth.
 */
void ieee80211_request_smps(struct ieee80211_vif *vif,
			    enum ieee80211_smps_mode smps_mode);

3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780
/**
 * ieee80211_ready_on_channel - notification of remain-on-channel start
 * @hw: pointer as obtained from ieee80211_alloc_hw()
 */
void ieee80211_ready_on_channel(struct ieee80211_hw *hw);

/**
 * ieee80211_remain_on_channel_expired - remain_on_channel duration expired
 * @hw: pointer as obtained from ieee80211_alloc_hw()
 */
void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw);

3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797
/**
 * ieee80211_stop_rx_ba_session - callback to stop existing BA sessions
 *
 * in order not to harm the system performance and user experience, the device
 * may request not to allow any rx ba session and tear down existing rx ba
 * sessions based on system constraints such as periodic BT activity that needs
 * to limit wlan activity (eg.sco or a2dp)."
 * in such cases, the intention is to limit the duration of the rx ppdu and
 * therefore prevent the peer device to use a-mpdu aggregation.
 *
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 * @ba_rx_bitmap: Bit map of open rx ba per tid
 * @addr: & to bssid mac address
 */
void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
				  const u8 *addr);

3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810
/**
 * ieee80211_send_bar - send a BlockAckReq frame
 *
 * can be used to flush pending frames from the peer's aggregation reorder
 * buffer.
 *
 * @vif: &struct ieee80211_vif pointer from the add_interface callback.
 * @ra: the peer's destination address
 * @tid: the TID of the aggregation session
 * @ssn: the new starting sequence number for the receiver
 */
void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn);

3811
/* Rate control API */
3812

3813
/**
3814 3815 3816 3817 3818
 * struct ieee80211_tx_rate_control - rate control information for/from RC algo
 *
 * @hw: The hardware the algorithm is invoked for.
 * @sband: The band this frame is being transmitted on.
 * @bss_conf: the current BSS configuration
3819 3820
 * @skb: the skb that will be transmitted, the control information in it needs
 *	to be filled in
3821 3822 3823 3824 3825 3826 3827
 * @reported_rate: The rate control algorithm can fill this in to indicate
 *	which rate should be reported to userspace as the current rate and
 *	used for rate calculations in the mesh network.
 * @rts: whether RTS will be used for this frame because it is longer than the
 *	RTS threshold
 * @short_preamble: whether mac80211 will request short-preamble transmission
 *	if the selected rate supports it
3828
 * @max_rate_idx: user-requested maximum (legacy) rate
3829 3830
 *	(deprecated; this will be removed once drivers get updated to use
 *	rate_idx_mask)
3831 3832
 * @rate_idx_mask: user-requested (legacy) rate mask
 * @rate_idx_mcs_mask: user-requested MCS rate mask
3833
 * @bss: whether this frame is sent out in AP or IBSS mode
3834 3835 3836 3837 3838 3839 3840 3841 3842
 */
struct ieee80211_tx_rate_control {
	struct ieee80211_hw *hw;
	struct ieee80211_supported_band *sband;
	struct ieee80211_bss_conf *bss_conf;
	struct sk_buff *skb;
	struct ieee80211_tx_rate reported_rate;
	bool rts, short_preamble;
	u8 max_rate_idx;
3843
	u32 rate_idx_mask;
3844
	u8 rate_idx_mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
3845
	bool bss;
3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856
};

struct rate_control_ops {
	struct module *module;
	const char *name;
	void *(*alloc)(struct ieee80211_hw *hw, struct dentry *debugfsdir);
	void (*free)(void *priv);

	void *(*alloc_sta)(void *priv, struct ieee80211_sta *sta, gfp_t gfp);
	void (*rate_init)(void *priv, struct ieee80211_supported_band *sband,
			  struct ieee80211_sta *sta, void *priv_sta);
3857
	void (*rate_update)(void *priv, struct ieee80211_supported_band *sband,
3858 3859
			    struct ieee80211_sta *sta, void *priv_sta,
			    u32 changed);
3860 3861 3862 3863 3864 3865
	void (*free_sta)(void *priv, struct ieee80211_sta *sta,
			 void *priv_sta);

	void (*tx_status)(void *priv, struct ieee80211_supported_band *sband,
			  struct ieee80211_sta *sta, void *priv_sta,
			  struct sk_buff *skb);
3866 3867
	void (*get_rate)(void *priv, struct ieee80211_sta *sta, void *priv_sta,
			 struct ieee80211_tx_rate_control *txrc);
3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880

	void (*add_sta_debugfs)(void *priv, void *priv_sta,
				struct dentry *dir);
	void (*remove_sta_debugfs)(void *priv, void *priv_sta);
};

static inline int rate_supported(struct ieee80211_sta *sta,
				 enum ieee80211_band band,
				 int index)
{
	return (sta == NULL || sta->supp_rates[band] & BIT(index));
}

3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903
/**
 * rate_control_send_low - helper for drivers for management/no-ack frames
 *
 * Rate control algorithms that agree to use the lowest rate to
 * send management frames and NO_ACK data with the respective hw
 * retries should use this in the beginning of their mac80211 get_rate
 * callback. If true is returned the rate control can simply return.
 * If false is returned we guarantee that sta and sta and priv_sta is
 * not null.
 *
 * Rate control algorithms wishing to do more intelligent selection of
 * rate for multicast/broadcast frames may choose to not use this.
 *
 * @sta: &struct ieee80211_sta pointer to the target destination. Note
 * 	that this may be null.
 * @priv_sta: private rate control structure. This may be null.
 * @txrc: rate control information we sholud populate for mac80211.
 */
bool rate_control_send_low(struct ieee80211_sta *sta,
			   void *priv_sta,
			   struct ieee80211_tx_rate_control *txrc);


3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914
static inline s8
rate_lowest_index(struct ieee80211_supported_band *sband,
		  struct ieee80211_sta *sta)
{
	int i;

	for (i = 0; i < sband->n_bitrates; i++)
		if (rate_supported(sta, sband->band, i))
			return i;

	/* warn when we cannot find a rate. */
3915
	WARN_ON_ONCE(1);
3916

3917
	/* and return 0 (the lowest index) */
3918 3919 3920
	return 0;
}

3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931
static inline
bool rate_usable_index_exists(struct ieee80211_supported_band *sband,
			      struct ieee80211_sta *sta)
{
	unsigned int i;

	for (i = 0; i < sband->n_bitrates; i++)
		if (rate_supported(sta, sband->band, i))
			return true;
	return false;
}
3932 3933 3934 3935

int ieee80211_rate_control_register(struct rate_control_ops *ops);
void ieee80211_rate_control_unregister(struct rate_control_ops *ops);

3936 3937 3938
static inline bool
conf_is_ht20(struct ieee80211_conf *conf)
{
3939
	return conf->channel_type == NL80211_CHAN_HT20;
3940 3941 3942 3943 3944
}

static inline bool
conf_is_ht40_minus(struct ieee80211_conf *conf)
{
3945
	return conf->channel_type == NL80211_CHAN_HT40MINUS;
3946 3947 3948 3949 3950
}

static inline bool
conf_is_ht40_plus(struct ieee80211_conf *conf)
{
3951
	return conf->channel_type == NL80211_CHAN_HT40PLUS;
3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962
}

static inline bool
conf_is_ht40(struct ieee80211_conf *conf)
{
	return conf_is_ht40_minus(conf) || conf_is_ht40_plus(conf);
}

static inline bool
conf_is_ht(struct ieee80211_conf *conf)
{
3963
	return conf->channel_type != NL80211_CHAN_NO_HT;
3964 3965
}

3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987
static inline enum nl80211_iftype
ieee80211_iftype_p2p(enum nl80211_iftype type, bool p2p)
{
	if (p2p) {
		switch (type) {
		case NL80211_IFTYPE_STATION:
			return NL80211_IFTYPE_P2P_CLIENT;
		case NL80211_IFTYPE_AP:
			return NL80211_IFTYPE_P2P_GO;
		default:
			break;
		}
	}
	return type;
}

static inline enum nl80211_iftype
ieee80211_vif_type_p2p(struct ieee80211_vif *vif)
{
	return ieee80211_iftype_p2p(vif->type, vif->p2p);
}

3988 3989 3990 3991 3992
void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
				   int rssi_min_thold,
				   int rssi_max_thold);

void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif);
3993

3994 3995 3996 3997 3998 3999 4000 4001
/**
 * ieee80211_ave_rssi - report the average rssi for the specified interface
 *
 * @vif: the specified virtual interface
 *
 * This function return the average rssi value for the requested interface.
 * It assumes that the given vif is valid.
 */
4002 4003
int ieee80211_ave_rssi(struct ieee80211_vif *vif);

4004
#endif /* MAC80211_H */