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32 results

cfg80211.h

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  • cfg80211.h 203.11 KiB
    #ifndef __NET_CFG80211_H
    #define __NET_CFG80211_H
    /*
     * 802.11 device and configuration interface
     *
     * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
     * Copyright 2013-2014 Intel Mobile Communications GmbH
     * Copyright 2015-2016	Intel Deutschland GmbH
     *
     * 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.
     */
    
    #include <linux/netdevice.h>
    #include <linux/debugfs.h>
    #include <linux/list.h>
    #include <linux/bug.h>
    #include <linux/netlink.h>
    #include <linux/skbuff.h>
    #include <linux/nl80211.h>
    #include <linux/if_ether.h>
    #include <linux/ieee80211.h>
    #include <linux/net.h>
    #include <net/regulatory.h>
    
    /**
     * DOC: Introduction
     *
     * cfg80211 is the configuration API for 802.11 devices in Linux. It bridges
     * userspace and drivers, and offers some utility functionality associated
     * with 802.11. cfg80211 must, directly or indirectly via mac80211, be used
     * by all modern wireless drivers in Linux, so that they offer a consistent
     * API through nl80211. For backward compatibility, cfg80211 also offers
     * wireless extensions to userspace, but hides them from drivers completely.
     *
     * Additionally, cfg80211 contains code to help enforce regulatory spectrum
     * use restrictions.
     */
    
    
    /**
     * DOC: Device registration
     *
     * In order for a driver to use cfg80211, it must register the hardware device
     * with cfg80211. This happens through a number of hardware capability structs
     * described below.
     *
     * The fundamental structure for each device is the 'wiphy', of which each
     * instance describes a physical wireless device connected to the system. Each
     * such wiphy can have zero, one, or many virtual interfaces associated with
     * it, which need to be identified as such by pointing the network interface's
     * @ieee80211_ptr pointer to a &struct wireless_dev which further describes
     * the wireless part of the interface, normally this struct is embedded in the
     * network interface's private data area. Drivers can optionally allow creating
     * or destroying virtual interfaces on the fly, but without at least one or the
     * ability to create some the wireless device isn't useful.
     *
     * Each wiphy structure contains device capability information, and also has
     * a pointer to the various operations the driver offers. The definitions and
     * structures here describe these capabilities in detail.
     */
    
    struct wiphy;
    
    /*
     * wireless hardware capability structures
     */
    
    /**
     * enum ieee80211_channel_flags - channel flags
     *
     * Channel flags set by the regulatory control code.
     *
     * @IEEE80211_CHAN_DISABLED: This channel is disabled.
     * @IEEE80211_CHAN_NO_IR: do not initiate radiation, this includes
     * 	sending probe requests or beaconing.
     * @IEEE80211_CHAN_RADAR: Radar detection is required on this channel.
     * @IEEE80211_CHAN_NO_HT40PLUS: extension channel above this channel
     * 	is not permitted.
     * @IEEE80211_CHAN_NO_HT40MINUS: extension channel below this channel
     * 	is not permitted.
     * @IEEE80211_CHAN_NO_OFDM: OFDM is not allowed on this channel.
     * @IEEE80211_CHAN_NO_80MHZ: If the driver supports 80 MHz on the band,
     *	this flag indicates that an 80 MHz channel cannot use this
     *	channel as the control or any of the secondary channels.
     *	This may be due to the driver or due to regulatory bandwidth
     *	restrictions.
     * @IEEE80211_CHAN_NO_160MHZ: If the driver supports 160 MHz on the band,
     *	this flag indicates that an 160 MHz channel cannot use this
     *	channel as the control or any of the secondary channels.
     *	This may be due to the driver or due to regulatory bandwidth
     *	restrictions.
     * @IEEE80211_CHAN_INDOOR_ONLY: see %NL80211_FREQUENCY_ATTR_INDOOR_ONLY
     * @IEEE80211_CHAN_IR_CONCURRENT: see %NL80211_FREQUENCY_ATTR_IR_CONCURRENT
     * @IEEE80211_CHAN_NO_20MHZ: 20 MHz bandwidth is not permitted
     *	on this channel.
     * @IEEE80211_CHAN_NO_10MHZ: 10 MHz bandwidth is not permitted
     *	on this channel.
     *
     */
    enum ieee80211_channel_flags {
    	IEEE80211_CHAN_DISABLED		= 1<<0,
    	IEEE80211_CHAN_NO_IR		= 1<<1,
    	/* hole at 1<<2 */
    	IEEE80211_CHAN_RADAR		= 1<<3,
    	IEEE80211_CHAN_NO_HT40PLUS	= 1<<4,
    	IEEE80211_CHAN_NO_HT40MINUS	= 1<<5,
    	IEEE80211_CHAN_NO_OFDM		= 1<<6,
    	IEEE80211_CHAN_NO_80MHZ		= 1<<7,
    	IEEE80211_CHAN_NO_160MHZ	= 1<<8,
    	IEEE80211_CHAN_INDOOR_ONLY	= 1<<9,
    	IEEE80211_CHAN_IR_CONCURRENT	= 1<<10,
    	IEEE80211_CHAN_NO_20MHZ		= 1<<11,
    	IEEE80211_CHAN_NO_10MHZ		= 1<<12,
    };
    
    #define IEEE80211_CHAN_NO_HT40 \
    	(IEEE80211_CHAN_NO_HT40PLUS | IEEE80211_CHAN_NO_HT40MINUS)
    
    #define IEEE80211_DFS_MIN_CAC_TIME_MS		60000
    #define IEEE80211_DFS_MIN_NOP_TIME_MS		(30 * 60 * 1000)
    
    /**
     * struct ieee80211_channel - channel definition
     *
     * This structure describes a single channel for use
     * with cfg80211.
     *
     * @center_freq: center frequency in MHz
     * @hw_value: hardware-specific value for the channel
     * @flags: channel flags from &enum ieee80211_channel_flags.
     * @orig_flags: channel flags at registration time, used by regulatory
     *	code to support devices with additional restrictions
     * @band: band this channel belongs to.
     * @max_antenna_gain: maximum antenna gain in dBi
     * @max_power: maximum transmission power (in dBm)
     * @max_reg_power: maximum regulatory transmission power (in dBm)
     * @beacon_found: helper to regulatory code to indicate when a beacon
     *	has been found on this channel. Use regulatory_hint_found_beacon()
     *	to enable this, this is useful only on 5 GHz band.
     * @orig_mag: internal use
     * @orig_mpwr: internal use
     * @dfs_state: current state of this channel. Only relevant if radar is required
     *	on this channel.
     * @dfs_state_entered: timestamp (jiffies) when the dfs state was entered.
     * @dfs_cac_ms: DFS CAC time in milliseconds, this is valid for DFS channels.
     */
    struct ieee80211_channel {
    	enum nl80211_band band;
    	u16 center_freq;
    	u16 hw_value;
    	u32 flags;
    	int max_antenna_gain;
    	int max_power;
    	int max_reg_power;
    	bool beacon_found;
    	u32 orig_flags;
    	int orig_mag, orig_mpwr;
    	enum nl80211_dfs_state dfs_state;
    	unsigned long dfs_state_entered;
    	unsigned int dfs_cac_ms;
    };
    
    /**
     * enum ieee80211_rate_flags - rate flags
     *
     * Hardware/specification flags for rates. These are structured
     * in a way that allows using the same bitrate structure for
     * different bands/PHY modes.
     *
     * @IEEE80211_RATE_SHORT_PREAMBLE: Hardware can send with short
     *	preamble on this bitrate; only relevant in 2.4GHz band and
     *	with CCK rates.
     * @IEEE80211_RATE_MANDATORY_A: This bitrate is a mandatory rate
     *	when used with 802.11a (on the 5 GHz band); filled by the
     *	core code when registering the wiphy.
     * @IEEE80211_RATE_MANDATORY_B: This bitrate is a mandatory rate
     *	when used with 802.11b (on the 2.4 GHz band); filled by the
     *	core code when registering the wiphy.
     * @IEEE80211_RATE_MANDATORY_G: This bitrate is a mandatory rate
     *	when used with 802.11g (on the 2.4 GHz band); filled by the
     *	core code when registering the wiphy.
     * @IEEE80211_RATE_ERP_G: This is an ERP rate in 802.11g mode.
     * @IEEE80211_RATE_SUPPORTS_5MHZ: Rate can be used in 5 MHz mode
     * @IEEE80211_RATE_SUPPORTS_10MHZ: Rate can be used in 10 MHz mode
     */
    enum ieee80211_rate_flags {
    	IEEE80211_RATE_SHORT_PREAMBLE	= 1<<0,
    	IEEE80211_RATE_MANDATORY_A	= 1<<1,
    	IEEE80211_RATE_MANDATORY_B	= 1<<2,
    	IEEE80211_RATE_MANDATORY_G	= 1<<3,
    	IEEE80211_RATE_ERP_G		= 1<<4,
    	IEEE80211_RATE_SUPPORTS_5MHZ	= 1<<5,
    	IEEE80211_RATE_SUPPORTS_10MHZ	= 1<<6,
    };
    
    /**
     * enum ieee80211_bss_type - BSS type filter
     *
     * @IEEE80211_BSS_TYPE_ESS: Infrastructure BSS
     * @IEEE80211_BSS_TYPE_PBSS: Personal BSS
     * @IEEE80211_BSS_TYPE_IBSS: Independent BSS
     * @IEEE80211_BSS_TYPE_MBSS: Mesh BSS
     * @IEEE80211_BSS_TYPE_ANY: Wildcard value for matching any BSS type
     */
    enum ieee80211_bss_type {
    	IEEE80211_BSS_TYPE_ESS,
    	IEEE80211_BSS_TYPE_PBSS,
    	IEEE80211_BSS_TYPE_IBSS,
    	IEEE80211_BSS_TYPE_MBSS,
    	IEEE80211_BSS_TYPE_ANY
    };
    
    /**
     * enum ieee80211_privacy - BSS privacy filter
     *
     * @IEEE80211_PRIVACY_ON: privacy bit set
     * @IEEE80211_PRIVACY_OFF: privacy bit clear
     * @IEEE80211_PRIVACY_ANY: Wildcard value for matching any privacy setting
     */
    enum ieee80211_privacy {
    	IEEE80211_PRIVACY_ON,
    	IEEE80211_PRIVACY_OFF,
    	IEEE80211_PRIVACY_ANY
    };
    
    #define IEEE80211_PRIVACY(x)	\
    	((x) ? IEEE80211_PRIVACY_ON : IEEE80211_PRIVACY_OFF)
    
    /**
     * struct ieee80211_rate - bitrate definition
     *
     * This structure describes a bitrate that an 802.11 PHY can
     * operate with. The two values @hw_value and @hw_value_short
     * are only for driver use when pointers to this structure are
     * passed around.
     *
     * @flags: rate-specific flags
     * @bitrate: bitrate in units of 100 Kbps
     * @hw_value: driver/hardware value for this rate
     * @hw_value_short: driver/hardware value for this rate when
     *	short preamble is used
     */
    struct ieee80211_rate {
    	u32 flags;
    	u16 bitrate;
    	u16 hw_value, hw_value_short;
    };
    
    /**
     * struct ieee80211_sta_ht_cap - STA's HT capabilities
     *
     * This structure describes most essential parameters needed
     * to describe 802.11n HT capabilities for an STA.
     *
     * @ht_supported: is HT supported by the STA
     * @cap: HT capabilities map as described in 802.11n spec
     * @ampdu_factor: Maximum A-MPDU length factor
     * @ampdu_density: Minimum A-MPDU spacing
     * @mcs: Supported MCS rates
     */
    struct ieee80211_sta_ht_cap {
    	u16 cap; /* use IEEE80211_HT_CAP_ */
    	bool ht_supported;
    	u8 ampdu_factor;
    	u8 ampdu_density;
    	struct ieee80211_mcs_info mcs;
    };
    
    /**
     * struct ieee80211_sta_vht_cap - STA's VHT capabilities
     *
     * This structure describes most essential parameters needed
     * to describe 802.11ac VHT capabilities for an STA.
     *
     * @vht_supported: is VHT supported by the STA
     * @cap: VHT capabilities map as described in 802.11ac spec
     * @vht_mcs: Supported VHT MCS rates
     */
    struct ieee80211_sta_vht_cap {
    	bool vht_supported;
    	u32 cap; /* use IEEE80211_VHT_CAP_ */
    	struct ieee80211_vht_mcs_info vht_mcs;
    };
    
    /**
     * struct ieee80211_supported_band - frequency band definition
     *
     * This structure describes a frequency band a wiphy
     * is able to operate in.
     *
     * @channels: Array of channels the hardware can operate in
     *	in this band.
     * @band: the band this structure represents
     * @n_channels: Number of channels in @channels
     * @bitrates: Array of bitrates the hardware can operate with
     *	in this band. Must be sorted to give a valid "supported
     *	rates" IE, i.e. CCK rates first, then OFDM.
     * @n_bitrates: Number of bitrates in @bitrates
     * @ht_cap: HT capabilities in this band
     * @vht_cap: VHT capabilities in this band
     */
    struct ieee80211_supported_band {
    	struct ieee80211_channel *channels;
    	struct ieee80211_rate *bitrates;
    	enum nl80211_band band;
    	int n_channels;
    	int n_bitrates;
    	struct ieee80211_sta_ht_cap ht_cap;
    	struct ieee80211_sta_vht_cap vht_cap;
    };
    
    /*
     * Wireless hardware/device configuration structures and methods
     */
    
    /**
     * DOC: Actions and configuration
     *
     * Each wireless device and each virtual interface offer a set of configuration
     * operations and other actions that are invoked by userspace. Each of these
     * actions is described in the operations structure, and the parameters these
     * operations use are described separately.
     *
     * Additionally, some operations are asynchronous and expect to get status
     * information via some functions that drivers need to call.
     *
     * Scanning and BSS list handling with its associated functionality is described
     * in a separate chapter.
     */
    
    #define VHT_MUMIMO_GROUPS_DATA_LEN (WLAN_MEMBERSHIP_LEN +\
    				    WLAN_USER_POSITION_LEN)
    
    /**
     * struct vif_params - describes virtual interface parameters
     * @use_4addr: use 4-address frames
     * @macaddr: address to use for this virtual interface.
     *	If this parameter is set to zero address the driver may
     *	determine the address as needed.
     *	This feature is only fully supported by drivers that enable the
     *	%NL80211_FEATURE_MAC_ON_CREATE flag.  Others may support creating
     **	only p2p devices with specified MAC.
     * @vht_mumimo_groups: MU-MIMO groupID. used for monitoring only
     *	 packets belonging to that MU-MIMO groupID.
     */
    struct vif_params {
    	int use_4addr;
    	u8 macaddr[ETH_ALEN];
    	u8 vht_mumimo_groups[VHT_MUMIMO_GROUPS_DATA_LEN];
    };
    
    /**
     * struct key_params - key information
     *
     * Information about a key
     *
     * @key: key material
     * @key_len: length of key material
     * @cipher: cipher suite selector
     * @seq: sequence counter (IV/PN) for TKIP and CCMP keys, only used
     *	with the get_key() callback, must be in little endian,
     *	length given by @seq_len.
     * @seq_len: length of @seq.
     */
    struct key_params {
    	const u8 *key;
    	const u8 *seq;
    	int key_len;
    	int seq_len;
    	u32 cipher;
    };
    
    /**
     * struct cfg80211_chan_def - channel definition
     * @chan: the (control) channel
     * @width: channel width
     * @center_freq1: center frequency of first segment
     * @center_freq2: center frequency of second segment
     *	(only with 80+80 MHz)
     */
    struct cfg80211_chan_def {
    	struct ieee80211_channel *chan;
    	enum nl80211_chan_width width;
    	u32 center_freq1;
    	u32 center_freq2;
    };
    
    /**
     * cfg80211_get_chandef_type - return old channel type from chandef
     * @chandef: the channel definition
     *
     * Return: The old channel type (NOHT, HT20, HT40+/-) from a given
     * chandef, which must have a bandwidth allowing this conversion.
     */
    static inline enum nl80211_channel_type
    cfg80211_get_chandef_type(const struct cfg80211_chan_def *chandef)
    {
    	switch (chandef->width) {
    	case NL80211_CHAN_WIDTH_20_NOHT:
    		return NL80211_CHAN_NO_HT;
    	case NL80211_CHAN_WIDTH_20:
    		return NL80211_CHAN_HT20;
    	case NL80211_CHAN_WIDTH_40:
    		if (chandef->center_freq1 > chandef->chan->center_freq)
    			return NL80211_CHAN_HT40PLUS;
    		return NL80211_CHAN_HT40MINUS;
    	default:
    		WARN_ON(1);
    		return NL80211_CHAN_NO_HT;
    	}
    }
    
    /**
     * cfg80211_chandef_create - create channel definition using channel type
     * @chandef: the channel definition struct to fill
     * @channel: the control channel
     * @chantype: the channel type
     *
     * Given a channel type, create a channel definition.
     */
    void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
    			     struct ieee80211_channel *channel,
    			     enum nl80211_channel_type chantype);
    
    /**
     * cfg80211_chandef_identical - check if two channel definitions are identical
     * @chandef1: first channel definition
     * @chandef2: second channel definition
     *
     * Return: %true if the channels defined by the channel definitions are
     * identical, %false otherwise.
     */
    static inline bool
    cfg80211_chandef_identical(const struct cfg80211_chan_def *chandef1,
    			   const struct cfg80211_chan_def *chandef2)
    {
    	return (chandef1->chan == chandef2->chan &&
    		chandef1->width == chandef2->width &&
    		chandef1->center_freq1 == chandef2->center_freq1 &&
    		chandef1->center_freq2 == chandef2->center_freq2);
    }
    
    /**
     * cfg80211_chandef_compatible - check if two channel definitions are compatible
     * @chandef1: first channel definition
     * @chandef2: second channel definition
     *
     * Return: %NULL if the given channel definitions are incompatible,
     * chandef1 or chandef2 otherwise.
     */
    const struct cfg80211_chan_def *
    cfg80211_chandef_compatible(const struct cfg80211_chan_def *chandef1,
    			    const struct cfg80211_chan_def *chandef2);
    
    /**
     * cfg80211_chandef_valid - check if a channel definition is valid
     * @chandef: the channel definition to check
     * Return: %true if the channel definition is valid. %false otherwise.
     */
    bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef);
    
    /**
     * cfg80211_chandef_usable - check if secondary channels can be used
     * @wiphy: the wiphy to validate against
     * @chandef: the channel definition to check
     * @prohibited_flags: the regulatory channel flags that must not be set
     * Return: %true if secondary channels are usable. %false otherwise.
     */
    bool cfg80211_chandef_usable(struct wiphy *wiphy,
    			     const struct cfg80211_chan_def *chandef,
    			     u32 prohibited_flags);
    
    /**
     * cfg80211_chandef_dfs_required - checks if radar detection is required
     * @wiphy: the wiphy to validate against
     * @chandef: the channel definition to check
     * @iftype: the interface type as specified in &enum nl80211_iftype
     * Returns:
     *	1 if radar detection is required, 0 if it is not, < 0 on error
     */
    int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
    				  const struct cfg80211_chan_def *chandef,
    				  enum nl80211_iftype iftype);
    
    /**
     * ieee80211_chandef_rate_flags - returns rate flags for a channel
     *
     * In some channel types, not all rates may be used - for example CCK
     * rates may not be used in 5/10 MHz channels.
     *
     * @chandef: channel definition for the channel
     *
     * Returns: rate flags which apply for this channel
     */
    static inline enum ieee80211_rate_flags
    ieee80211_chandef_rate_flags(struct cfg80211_chan_def *chandef)
    {
    	switch (chandef->width) {
    	case NL80211_CHAN_WIDTH_5:
    		return IEEE80211_RATE_SUPPORTS_5MHZ;
    	case NL80211_CHAN_WIDTH_10:
    		return IEEE80211_RATE_SUPPORTS_10MHZ;
    	default:
    		break;
    	}
    	return 0;
    }
    
    /**
     * ieee80211_chandef_max_power - maximum transmission power for the chandef
     *
     * In some regulations, the transmit power may depend on the configured channel
     * bandwidth which may be defined as dBm/MHz. This function returns the actual
     * max_power for non-standard (20 MHz) channels.
     *
     * @chandef: channel definition for the channel
     *
     * Returns: maximum allowed transmission power in dBm for the chandef
     */
    static inline int
    ieee80211_chandef_max_power(struct cfg80211_chan_def *chandef)
    {
    	switch (chandef->width) {
    	case NL80211_CHAN_WIDTH_5:
    		return min(chandef->chan->max_reg_power - 6,
    			   chandef->chan->max_power);
    	case NL80211_CHAN_WIDTH_10:
    		return min(chandef->chan->max_reg_power - 3,
    			   chandef->chan->max_power);
    	default:
    		break;
    	}
    	return chandef->chan->max_power;
    }
    
    /**
     * enum survey_info_flags - survey information flags
     *
     * @SURVEY_INFO_NOISE_DBM: noise (in dBm) was filled in
     * @SURVEY_INFO_IN_USE: channel is currently being used
     * @SURVEY_INFO_TIME: active time (in ms) was filled in
     * @SURVEY_INFO_TIME_BUSY: busy time was filled in
     * @SURVEY_INFO_TIME_EXT_BUSY: extension channel busy time was filled in
     * @SURVEY_INFO_TIME_RX: receive time was filled in
     * @SURVEY_INFO_TIME_TX: transmit time was filled in
     * @SURVEY_INFO_TIME_SCAN: scan time was filled in
     *
     * Used by the driver to indicate which info in &struct survey_info
     * it has filled in during the get_survey().
     */
    enum survey_info_flags {
    	SURVEY_INFO_NOISE_DBM		= BIT(0),
    	SURVEY_INFO_IN_USE		= BIT(1),
    	SURVEY_INFO_TIME		= BIT(2),
    	SURVEY_INFO_TIME_BUSY		= BIT(3),
    	SURVEY_INFO_TIME_EXT_BUSY	= BIT(4),
    	SURVEY_INFO_TIME_RX		= BIT(5),
    	SURVEY_INFO_TIME_TX		= BIT(6),
    	SURVEY_INFO_TIME_SCAN		= BIT(7),
    };
    
    /**
     * struct survey_info - channel survey response
     *
     * @channel: the channel this survey record reports, may be %NULL for a single
     *	record to report global statistics
     * @filled: bitflag of flags from &enum survey_info_flags
     * @noise: channel noise in dBm. This and all following fields are
     *	optional
     * @time: amount of time in ms the radio was turn on (on the channel)
     * @time_busy: amount of time the primary channel was sensed busy
     * @time_ext_busy: amount of time the extension channel was sensed busy
     * @time_rx: amount of time the radio spent receiving data
     * @time_tx: amount of time the radio spent transmitting data
     * @time_scan: amount of time the radio spent for scanning
     *
     * Used by dump_survey() to report back per-channel survey information.
     *
     * This structure can later be expanded with things like
     * channel duty cycle etc.
     */
    struct survey_info {
    	struct ieee80211_channel *channel;
    	u64 time;
    	u64 time_busy;
    	u64 time_ext_busy;
    	u64 time_rx;
    	u64 time_tx;
    	u64 time_scan;
    	u32 filled;
    	s8 noise;
    };
    
    #define CFG80211_MAX_WEP_KEYS	4
    
    /**
     * struct cfg80211_crypto_settings - Crypto settings
     * @wpa_versions: indicates which, if any, WPA versions are enabled
     *	(from enum nl80211_wpa_versions)
     * @cipher_group: group key cipher suite (or 0 if unset)
     * @n_ciphers_pairwise: number of AP supported unicast ciphers
     * @ciphers_pairwise: unicast key cipher suites
     * @n_akm_suites: number of AKM suites
     * @akm_suites: AKM suites
     * @control_port: Whether user space controls IEEE 802.1X port, i.e.,
     *	sets/clears %NL80211_STA_FLAG_AUTHORIZED. If true, the driver is
     *	required to assume that the port is unauthorized until authorized by
     *	user space. Otherwise, port is marked authorized by default.
     * @control_port_ethertype: the control port protocol that should be
     *	allowed through even on unauthorized ports
     * @control_port_no_encrypt: TRUE to prevent encryption of control port
     *	protocol frames.
     * @wep_keys: static WEP keys, if not NULL points to an array of
     *	CFG80211_MAX_WEP_KEYS WEP keys
     * @wep_tx_key: key index (0..3) of the default TX static WEP key
     */
    struct cfg80211_crypto_settings {
    	u32 wpa_versions;
    	u32 cipher_group;
    	int n_ciphers_pairwise;
    	u32 ciphers_pairwise[NL80211_MAX_NR_CIPHER_SUITES];
    	int n_akm_suites;
    	u32 akm_suites[NL80211_MAX_NR_AKM_SUITES];
    	bool control_port;
    	__be16 control_port_ethertype;
    	bool control_port_no_encrypt;
    	struct key_params *wep_keys;
    	int wep_tx_key;
    };
    
    /**
     * struct cfg80211_beacon_data - beacon data
     * @head: head portion of beacon (before TIM IE)
     *	or %NULL if not changed
     * @tail: tail portion of beacon (after TIM IE)
     *	or %NULL if not changed
     * @head_len: length of @head
     * @tail_len: length of @tail
     * @beacon_ies: extra information element(s) to add into Beacon frames or %NULL
     * @beacon_ies_len: length of beacon_ies in octets
     * @proberesp_ies: extra information element(s) to add into Probe Response
     *	frames or %NULL
     * @proberesp_ies_len: length of proberesp_ies in octets
     * @assocresp_ies: extra information element(s) to add into (Re)Association
     *	Response frames or %NULL
     * @assocresp_ies_len: length of assocresp_ies in octets
     * @probe_resp_len: length of probe response template (@probe_resp)
     * @probe_resp: probe response template (AP mode only)
     */
    struct cfg80211_beacon_data {
    	const u8 *head, *tail;
    	const u8 *beacon_ies;
    	const u8 *proberesp_ies;
    	const u8 *assocresp_ies;
    	const u8 *probe_resp;
    
    	size_t head_len, tail_len;
    	size_t beacon_ies_len;
    	size_t proberesp_ies_len;
    	size_t assocresp_ies_len;
    	size_t probe_resp_len;
    };
    
    struct mac_address {
    	u8 addr[ETH_ALEN];
    };
    
    /**
     * struct cfg80211_acl_data - Access control list data
     *
     * @acl_policy: ACL policy to be applied on the station's
     *	entry specified by mac_addr
     * @n_acl_entries: Number of MAC address entries passed
     * @mac_addrs: List of MAC addresses of stations to be used for ACL
     */
    struct cfg80211_acl_data {
    	enum nl80211_acl_policy acl_policy;
    	int n_acl_entries;
    
    	/* Keep it last */
    	struct mac_address mac_addrs[];
    };
    
    /*
     * cfg80211_bitrate_mask - masks for bitrate control
     */
    struct cfg80211_bitrate_mask {
    	struct {
    		u32 legacy;
    		u8 ht_mcs[IEEE80211_HT_MCS_MASK_LEN];
    		u16 vht_mcs[NL80211_VHT_NSS_MAX];
    		enum nl80211_txrate_gi gi;
    	} control[NUM_NL80211_BANDS];
    };
    
    /**
     * struct cfg80211_ap_settings - AP configuration
     *
     * Used to configure an AP interface.
     *
     * @chandef: defines the channel to use
     * @beacon: beacon data
     * @beacon_interval: beacon interval
     * @dtim_period: DTIM period
     * @ssid: SSID to be used in the BSS (note: may be %NULL if not provided from
     *	user space)
     * @ssid_len: length of @ssid
     * @hidden_ssid: whether to hide the SSID in Beacon/Probe Response frames
     * @crypto: crypto settings
     * @privacy: the BSS uses privacy
     * @auth_type: Authentication type (algorithm)
     * @smps_mode: SMPS mode
     * @inactivity_timeout: time in seconds to determine station's inactivity.
     * @p2p_ctwindow: P2P CT Window
     * @p2p_opp_ps: P2P opportunistic PS
     * @acl: ACL configuration used by the drivers which has support for
     *	MAC address based access control
     * @pbss: If set, start as a PCP instead of AP. Relevant for DMG
     *	networks.
     * @beacon_rate: bitrate to be used for beacons
     */
    struct cfg80211_ap_settings {
    	struct cfg80211_chan_def chandef;
    
    	struct cfg80211_beacon_data beacon;
    
    	int beacon_interval, dtim_period;
    	const u8 *ssid;
    	size_t ssid_len;
    	enum nl80211_hidden_ssid hidden_ssid;
    	struct cfg80211_crypto_settings crypto;
    	bool privacy;
    	enum nl80211_auth_type auth_type;
    	enum nl80211_smps_mode smps_mode;
    	int inactivity_timeout;
    	u8 p2p_ctwindow;
    	bool p2p_opp_ps;
    	const struct cfg80211_acl_data *acl;
    	bool pbss;
    	struct cfg80211_bitrate_mask beacon_rate;
    };
    
    /**
     * struct cfg80211_csa_settings - channel switch settings
     *
     * Used for channel switch
     *
     * @chandef: defines the channel to use after the switch
     * @beacon_csa: beacon data while performing the switch
     * @counter_offsets_beacon: offsets of the counters within the beacon (tail)
     * @counter_offsets_presp: offsets of the counters within the probe response
     * @n_counter_offsets_beacon: number of csa counters the beacon (tail)
     * @n_counter_offsets_presp: number of csa counters in the probe response
     * @beacon_after: beacon data to be used on the new channel
     * @radar_required: whether radar detection is required on the new channel
     * @block_tx: whether transmissions should be blocked while changing
     * @count: number of beacons until switch
     */
    struct cfg80211_csa_settings {
    	struct cfg80211_chan_def chandef;
    	struct cfg80211_beacon_data beacon_csa;
    	const u16 *counter_offsets_beacon;
    	const u16 *counter_offsets_presp;
    	unsigned int n_counter_offsets_beacon;
    	unsigned int n_counter_offsets_presp;
    	struct cfg80211_beacon_data beacon_after;
    	bool radar_required;
    	bool block_tx;
    	u8 count;
    };
    
    /**
     * enum station_parameters_apply_mask - station parameter values to apply
     * @STATION_PARAM_APPLY_UAPSD: apply new uAPSD parameters (uapsd_queues, max_sp)
     * @STATION_PARAM_APPLY_CAPABILITY: apply new capability
     * @STATION_PARAM_APPLY_PLINK_STATE: apply new plink state
     *
     * Not all station parameters have in-band "no change" signalling,
     * for those that don't these flags will are used.
     */
    enum station_parameters_apply_mask {
    	STATION_PARAM_APPLY_UAPSD = BIT(0),
    	STATION_PARAM_APPLY_CAPABILITY = BIT(1),
    	STATION_PARAM_APPLY_PLINK_STATE = BIT(2),
    };
    
    /**
     * struct station_parameters - station parameters
     *
     * Used to change and create a new station.
     *
     * @vlan: vlan interface station should belong to
     * @supported_rates: supported rates in IEEE 802.11 format
     *	(or NULL for no change)
     * @supported_rates_len: number of supported rates
     * @sta_flags_mask: station flags that changed
     *	(bitmask of BIT(%NL80211_STA_FLAG_...))
     * @sta_flags_set: station flags values
     *	(bitmask of BIT(%NL80211_STA_FLAG_...))
     * @listen_interval: listen interval or -1 for no change
     * @aid: AID or zero for no change
     * @peer_aid: mesh peer AID or zero for no change
     * @plink_action: plink action to take
     * @plink_state: set the peer link state for a station
     * @ht_capa: HT capabilities of station
     * @vht_capa: VHT capabilities of station
     * @uapsd_queues: bitmap of queues configured for uapsd. same format
     *	as the AC bitmap in the QoS info field
     * @max_sp: max Service Period. same format as the MAX_SP in the
     *	QoS info field (but already shifted down)
     * @sta_modify_mask: bitmap indicating which parameters changed
     *	(for those that don't have a natural "no change" value),
     *	see &enum station_parameters_apply_mask
     * @local_pm: local link-specific mesh power save mode (no change when set
     *	to unknown)
     * @capability: station capability
     * @ext_capab: extended capabilities of the station
     * @ext_capab_len: number of extended capabilities
     * @supported_channels: supported channels in IEEE 802.11 format
     * @supported_channels_len: number of supported channels
     * @supported_oper_classes: supported oper classes in IEEE 802.11 format
     * @supported_oper_classes_len: number of supported operating classes
     * @opmode_notif: operating mode field from Operating Mode Notification
     * @opmode_notif_used: information if operating mode field is used
     * @support_p2p_ps: information if station supports P2P PS mechanism
     */
    struct station_parameters {
    	const u8 *supported_rates;
    	struct net_device *vlan;
    	u32 sta_flags_mask, sta_flags_set;
    	u32 sta_modify_mask;
    	int listen_interval;
    	u16 aid;
    	u16 peer_aid;
    	u8 supported_rates_len;
    	u8 plink_action;
    	u8 plink_state;
    	const struct ieee80211_ht_cap *ht_capa;
    	const struct ieee80211_vht_cap *vht_capa;
    	u8 uapsd_queues;
    	u8 max_sp;
    	enum nl80211_mesh_power_mode local_pm;
    	u16 capability;
    	const u8 *ext_capab;
    	u8 ext_capab_len;
    	const u8 *supported_channels;
    	u8 supported_channels_len;
    	const u8 *supported_oper_classes;
    	u8 supported_oper_classes_len;
    	u8 opmode_notif;
    	bool opmode_notif_used;
    	int support_p2p_ps;
    };
    
    /**
     * struct station_del_parameters - station deletion parameters
     *
     * Used to delete a station entry (or all stations).
     *
     * @mac: MAC address of the station to remove or NULL to remove all stations
     * @subtype: Management frame subtype to use for indicating removal
     *	(10 = Disassociation, 12 = Deauthentication)
     * @reason_code: Reason code for the Disassociation/Deauthentication frame
     */
    struct station_del_parameters {
    	const u8 *mac;
    	u8 subtype;
    	u16 reason_code;
    };
    
    /**
     * enum cfg80211_station_type - the type of station being modified
     * @CFG80211_STA_AP_CLIENT: client of an AP interface
     * @CFG80211_STA_AP_CLIENT_UNASSOC: client of an AP interface that is still
     *	unassociated (update properties for this type of client is permitted)
     * @CFG80211_STA_AP_MLME_CLIENT: client of an AP interface that has
     *	the AP MLME in the device
     * @CFG80211_STA_AP_STA: AP station on managed interface
     * @CFG80211_STA_IBSS: IBSS station
     * @CFG80211_STA_TDLS_PEER_SETUP: TDLS peer on managed interface (dummy entry
     *	while TDLS setup is in progress, it moves out of this state when
     *	being marked authorized; use this only if TDLS with external setup is
     *	supported/used)
     * @CFG80211_STA_TDLS_PEER_ACTIVE: TDLS peer on managed interface (active
     *	entry that is operating, has been marked authorized by userspace)
     * @CFG80211_STA_MESH_PEER_KERNEL: peer on mesh interface (kernel managed)
     * @CFG80211_STA_MESH_PEER_USER: peer on mesh interface (user managed)
     */
    enum cfg80211_station_type {
    	CFG80211_STA_AP_CLIENT,
    	CFG80211_STA_AP_CLIENT_UNASSOC,
    	CFG80211_STA_AP_MLME_CLIENT,
    	CFG80211_STA_AP_STA,
    	CFG80211_STA_IBSS,
    	CFG80211_STA_TDLS_PEER_SETUP,
    	CFG80211_STA_TDLS_PEER_ACTIVE,
    	CFG80211_STA_MESH_PEER_KERNEL,
    	CFG80211_STA_MESH_PEER_USER,
    };
    
    /**
     * cfg80211_check_station_change - validate parameter changes
     * @wiphy: the wiphy this operates on
     * @params: the new parameters for a station
     * @statype: the type of station being modified
     *
     * Utility function for the @change_station driver method. Call this function
     * with the appropriate station type looking up the station (and checking that
     * it exists). It will verify whether the station change is acceptable, and if
     * not will return an error code. Note that it may modify the parameters for
     * backward compatibility reasons, so don't use them before calling this.
     */
    int cfg80211_check_station_change(struct wiphy *wiphy,
    				  struct station_parameters *params,
    				  enum cfg80211_station_type statype);
    
    /**
     * enum station_info_rate_flags - bitrate info flags
     *
     * Used by the driver to indicate the specific rate transmission
     * type for 802.11n transmissions.
     *
     * @RATE_INFO_FLAGS_MCS: mcs field filled with HT MCS
     * @RATE_INFO_FLAGS_VHT_MCS: mcs field filled with VHT MCS
     * @RATE_INFO_FLAGS_SHORT_GI: 400ns guard interval
     * @RATE_INFO_FLAGS_60G: 60GHz MCS
     */
    enum rate_info_flags {
    	RATE_INFO_FLAGS_MCS			= BIT(0),
    	RATE_INFO_FLAGS_VHT_MCS			= BIT(1),
    	RATE_INFO_FLAGS_SHORT_GI		= BIT(2),
    	RATE_INFO_FLAGS_60G			= BIT(3),
    };
    
    /**
     * enum rate_info_bw - rate bandwidth information
     *
     * Used by the driver to indicate the rate bandwidth.
     *
     * @RATE_INFO_BW_5: 5 MHz bandwidth
     * @RATE_INFO_BW_10: 10 MHz bandwidth
     * @RATE_INFO_BW_20: 20 MHz bandwidth
     * @RATE_INFO_BW_40: 40 MHz bandwidth
     * @RATE_INFO_BW_80: 80 MHz bandwidth
     * @RATE_INFO_BW_160: 160 MHz bandwidth
     */
    enum rate_info_bw {
    	RATE_INFO_BW_5,
    	RATE_INFO_BW_10,
    	RATE_INFO_BW_20,
    	RATE_INFO_BW_40,
    	RATE_INFO_BW_80,
    	RATE_INFO_BW_160,
    };
    
    /**
     * struct rate_info - bitrate information
     *
     * Information about a receiving or transmitting bitrate
     *
     * @flags: bitflag of flags from &enum rate_info_flags
     * @mcs: mcs index if struct describes a 802.11n bitrate
     * @legacy: bitrate in 100kbit/s for 802.11abg
     * @nss: number of streams (VHT only)
     * @bw: bandwidth (from &enum rate_info_bw)
     */
    struct rate_info {
    	u8 flags;
    	u8 mcs;
    	u16 legacy;
    	u8 nss;
    	u8 bw;
    };
    
    /**
     * enum station_info_rate_flags - bitrate info flags
     *
     * Used by the driver to indicate the specific rate transmission
     * type for 802.11n transmissions.
     *
     * @BSS_PARAM_FLAGS_CTS_PROT: whether CTS protection is enabled
     * @BSS_PARAM_FLAGS_SHORT_PREAMBLE: whether short preamble is enabled
     * @BSS_PARAM_FLAGS_SHORT_SLOT_TIME: whether short slot time is enabled
     */
    enum bss_param_flags {
    	BSS_PARAM_FLAGS_CTS_PROT	= 1<<0,
    	BSS_PARAM_FLAGS_SHORT_PREAMBLE	= 1<<1,
    	BSS_PARAM_FLAGS_SHORT_SLOT_TIME	= 1<<2,
    };
    
    /**
     * struct sta_bss_parameters - BSS parameters for the attached station
     *
     * Information about the currently associated BSS
     *
     * @flags: bitflag of flags from &enum bss_param_flags
     * @dtim_period: DTIM period for the BSS
     * @beacon_interval: beacon interval
     */
    struct sta_bss_parameters {
    	u8 flags;
    	u8 dtim_period;
    	u16 beacon_interval;
    };
    
    /**
     * struct cfg80211_tid_stats - per-TID statistics
     * @filled: bitmap of flags using the bits of &enum nl80211_tid_stats to
     *	indicate the relevant values in this struct are filled
     * @rx_msdu: number of received MSDUs
     * @tx_msdu: number of (attempted) transmitted MSDUs
     * @tx_msdu_retries: number of retries (not counting the first) for
     *	transmitted MSDUs
     * @tx_msdu_failed: number of failed transmitted MSDUs
     */
    struct cfg80211_tid_stats {
    	u32 filled;
    	u64 rx_msdu;
    	u64 tx_msdu;
    	u64 tx_msdu_retries;
    	u64 tx_msdu_failed;
    };
    
    #define IEEE80211_MAX_CHAINS	4
    
    /**
     * struct station_info - station information
     *
     * Station information filled by driver for get_station() and dump_station.
     *
     * @filled: bitflag of flags using the bits of &enum nl80211_sta_info to
     *	indicate the relevant values in this struct for them
     * @connected_time: time(in secs) since a station is last connected
     * @inactive_time: time since last station activity (tx/rx) in milliseconds
     * @rx_bytes: bytes (size of MPDUs) received from this station
     * @tx_bytes: bytes (size of MPDUs) transmitted to this station
     * @llid: mesh local link id
     * @plid: mesh peer link id
     * @plink_state: mesh peer link state
     * @signal: The signal strength, type depends on the wiphy's signal_type.
     *	For CFG80211_SIGNAL_TYPE_MBM, value is expressed in _dBm_.
     * @signal_avg: Average signal strength, type depends on the wiphy's signal_type.
     *	For CFG80211_SIGNAL_TYPE_MBM, value is expressed in _dBm_.
     * @chains: bitmask for filled values in @chain_signal, @chain_signal_avg
     * @chain_signal: per-chain signal strength of last received packet in dBm
     * @chain_signal_avg: per-chain signal strength average in dBm
     * @txrate: current unicast bitrate from this station
     * @rxrate: current unicast bitrate to this station
     * @rx_packets: packets (MSDUs & MMPDUs) received from this station
     * @tx_packets: packets (MSDUs & MMPDUs) transmitted to this station
     * @tx_retries: cumulative retry counts (MPDUs)
     * @tx_failed: number of failed transmissions (MPDUs) (retries exceeded, no ACK)
     * @rx_dropped_misc:  Dropped for un-specified reason.
     * @bss_param: current BSS parameters
     * @generation: generation number for nl80211 dumps.
     *	This number should increase every time the list of stations
     *	changes, i.e. when a station is added or removed, so that
     *	userspace can tell whether it got a consistent snapshot.
     * @assoc_req_ies: IEs from (Re)Association Request.
     *	This is used only when in AP mode with drivers that do not use
     *	user space MLME/SME implementation. The information is provided for
     *	the cfg80211_new_sta() calls to notify user space of the IEs.
     * @assoc_req_ies_len: Length of assoc_req_ies buffer in octets.
     * @sta_flags: station flags mask & values
     * @beacon_loss_count: Number of times beacon loss event has triggered.
     * @t_offset: Time offset of the station relative to this host.
     * @local_pm: local mesh STA power save mode
     * @peer_pm: peer mesh STA power save mode
     * @nonpeer_pm: non-peer mesh STA power save mode
     * @expected_throughput: expected throughput in kbps (including 802.11 headers)
     *	towards this station.
     * @rx_beacon: number of beacons received from this peer
     * @rx_beacon_signal_avg: signal strength average (in dBm) for beacons received
     *	from this peer
     * @rx_duration: aggregate PPDU duration(usecs) for all the frames from a peer
     * @pertid: per-TID statistics, see &struct cfg80211_tid_stats, using the last
     *	(IEEE80211_NUM_TIDS) index for MSDUs not encapsulated in QoS-MPDUs.
     */
    struct station_info {
    	u64 filled;
    	u32 connected_time;
    	u32 inactive_time;
    	u64 rx_bytes;
    	u64 tx_bytes;
    	u16 llid;
    	u16 plid;
    	u8 plink_state;
    	s8 signal;
    	s8 signal_avg;
    
    	u8 chains;
    	s8 chain_signal[IEEE80211_MAX_CHAINS];
    	s8 chain_signal_avg[IEEE80211_MAX_CHAINS];
    
    	struct rate_info txrate;
    	struct rate_info rxrate;
    	u32 rx_packets;
    	u32 tx_packets;
    	u32 tx_retries;
    	u32 tx_failed;
    	u32 rx_dropped_misc;
    	struct sta_bss_parameters bss_param;
    	struct nl80211_sta_flag_update sta_flags;
    
    	int generation;
    
    	const u8 *assoc_req_ies;
    	size_t assoc_req_ies_len;
    
    	u32 beacon_loss_count;
    	s64 t_offset;
    	enum nl80211_mesh_power_mode local_pm;
    	enum nl80211_mesh_power_mode peer_pm;
    	enum nl80211_mesh_power_mode nonpeer_pm;
    
    	u32 expected_throughput;
    
    	u64 rx_beacon;
    	u64 rx_duration;
    	u8 rx_beacon_signal_avg;
    	struct cfg80211_tid_stats pertid[IEEE80211_NUM_TIDS + 1];
    };
    
    #if IS_ENABLED(CONFIG_CFG80211)
    /**
     * cfg80211_get_station - retrieve information about a given station
     * @dev: the device where the station is supposed to be connected to
     * @mac_addr: the mac address of the station of interest
     * @sinfo: pointer to the structure to fill with the information
     *
     * Returns 0 on success and sinfo is filled with the available information
     * otherwise returns a negative error code and the content of sinfo has to be
     * considered undefined.
     */
    int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
    			 struct station_info *sinfo);
    #else
    static inline int cfg80211_get_station(struct net_device *dev,
    				       const u8 *mac_addr,
    				       struct station_info *sinfo)
    {
    	return -ENOENT;
    }
    #endif
    
    /**
     * enum monitor_flags - monitor flags
     *
     * Monitor interface configuration flags. Note that these must be the bits
     * according to the nl80211 flags.
     *
     * @MONITOR_FLAG_FCSFAIL: pass frames with bad FCS
     * @MONITOR_FLAG_PLCPFAIL: pass frames with bad PLCP
     * @MONITOR_FLAG_CONTROL: pass control frames
     * @MONITOR_FLAG_OTHER_BSS: disable BSSID filtering
     * @MONITOR_FLAG_COOK_FRAMES: report frames after processing
     * @MONITOR_FLAG_ACTIVE: active monitor, ACKs frames on its MAC address
     */
    enum monitor_flags {
    	MONITOR_FLAG_FCSFAIL		= 1<<NL80211_MNTR_FLAG_FCSFAIL,
    	MONITOR_FLAG_PLCPFAIL		= 1<<NL80211_MNTR_FLAG_PLCPFAIL,
    	MONITOR_FLAG_CONTROL		= 1<<NL80211_MNTR_FLAG_CONTROL,
    	MONITOR_FLAG_OTHER_BSS		= 1<<NL80211_MNTR_FLAG_OTHER_BSS,
    	MONITOR_FLAG_COOK_FRAMES	= 1<<NL80211_MNTR_FLAG_COOK_FRAMES,
    	MONITOR_FLAG_ACTIVE		= 1<<NL80211_MNTR_FLAG_ACTIVE,
    };
    
    /**
     * enum mpath_info_flags -  mesh path information flags
     *
     * Used by the driver to indicate which info in &struct mpath_info it has filled
     * in during get_station() or dump_station().
     *
     * @MPATH_INFO_FRAME_QLEN: @frame_qlen filled
     * @MPATH_INFO_SN: @sn filled
     * @MPATH_INFO_METRIC: @metric filled
     * @MPATH_INFO_EXPTIME: @exptime filled
     * @MPATH_INFO_DISCOVERY_TIMEOUT: @discovery_timeout filled
     * @MPATH_INFO_DISCOVERY_RETRIES: @discovery_retries filled
     * @MPATH_INFO_FLAGS: @flags filled
     */
    enum mpath_info_flags {
    	MPATH_INFO_FRAME_QLEN		= BIT(0),
    	MPATH_INFO_SN			= BIT(1),
    	MPATH_INFO_METRIC		= BIT(2),
    	MPATH_INFO_EXPTIME		= BIT(3),
    	MPATH_INFO_DISCOVERY_TIMEOUT	= BIT(4),
    	MPATH_INFO_DISCOVERY_RETRIES	= BIT(5),
    	MPATH_INFO_FLAGS		= BIT(6),
    };
    
    /**
     * struct mpath_info - mesh path information
     *
     * Mesh path information filled by driver for get_mpath() and dump_mpath().
     *
     * @filled: bitfield of flags from &enum mpath_info_flags
     * @frame_qlen: number of queued frames for this destination
     * @sn: target sequence number
     * @metric: metric (cost) of this mesh path
     * @exptime: expiration time for the mesh path from now, in msecs
     * @flags: mesh path flags
     * @discovery_timeout: total mesh path discovery timeout, in msecs
     * @discovery_retries: mesh path discovery retries
     * @generation: generation number for nl80211 dumps.
     *	This number should increase every time the list of mesh paths
     *	changes, i.e. when a station is added or removed, so that
     *	userspace can tell whether it got a consistent snapshot.
     */
    struct mpath_info {
    	u32 filled;
    	u32 frame_qlen;
    	u32 sn;
    	u32 metric;
    	u32 exptime;
    	u32 discovery_timeout;
    	u8 discovery_retries;
    	u8 flags;
    
    	int generation;
    };
    
    /**
     * struct bss_parameters - BSS parameters
     *
     * Used to change BSS parameters (mainly for AP mode).
     *
     * @use_cts_prot: Whether to use CTS protection
     *	(0 = no, 1 = yes, -1 = do not change)
     * @use_short_preamble: Whether the use of short preambles is allowed
     *	(0 = no, 1 = yes, -1 = do not change)
     * @use_short_slot_time: Whether the use of short slot time is allowed
     *	(0 = no, 1 = yes, -1 = do not change)
     * @basic_rates: basic rates in IEEE 802.11 format
     *	(or NULL for no change)
     * @basic_rates_len: number of basic rates
     * @ap_isolate: do not forward packets between connected stations
     * @ht_opmode: HT Operation mode
     * 	(u16 = opmode, -1 = do not change)
     * @p2p_ctwindow: P2P CT Window (-1 = no change)
     * @p2p_opp_ps: P2P opportunistic PS (-1 = no change)
     */
    struct bss_parameters {
    	int use_cts_prot;
    	int use_short_preamble;
    	int use_short_slot_time;
    	const u8 *basic_rates;
    	u8 basic_rates_len;
    	int ap_isolate;
    	int ht_opmode;
    	s8 p2p_ctwindow, p2p_opp_ps;
    };
    
    /**
     * struct mesh_config - 802.11s mesh configuration
     *
     * These parameters can be changed while the mesh is active.
     *
     * @dot11MeshRetryTimeout: the initial retry timeout in millisecond units used
     *	by the Mesh Peering Open message
     * @dot11MeshConfirmTimeout: the initial retry timeout in millisecond units
     *	used by the Mesh Peering Open message
     * @dot11MeshHoldingTimeout: the confirm timeout in millisecond units used by
     *	the mesh peering management to close a mesh peering
     * @dot11MeshMaxPeerLinks: the maximum number of peer links allowed on this
     *	mesh interface
     * @dot11MeshMaxRetries: the maximum number of peer link open retries that can
     *	be sent to establish a new peer link instance in a mesh
     * @dot11MeshTTL: the value of TTL field set at a source mesh STA
     * @element_ttl: the value of TTL field set at a mesh STA for path selection
     *	elements
     * @auto_open_plinks: whether we should automatically open peer links when we
     *	detect compatible mesh peers
     * @dot11MeshNbrOffsetMaxNeighbor: the maximum number of neighbors to
     *	synchronize to for 11s default synchronization method
     * @dot11MeshHWMPmaxPREQretries: the number of action frames containing a PREQ
     *	that an originator mesh STA can send to a particular path target
     * @path_refresh_time: how frequently to refresh mesh paths in milliseconds
     * @min_discovery_timeout: the minimum length of time to wait until giving up on
     *	a path discovery in milliseconds
     * @dot11MeshHWMPactivePathTimeout: the time (in TUs) for which mesh STAs
     *	receiving a PREQ shall consider the forwarding information from the
     *	root to be valid. (TU = time unit)
     * @dot11MeshHWMPpreqMinInterval: the minimum interval of time (in TUs) during
     *	which a mesh STA can send only one action frame containing a PREQ
     *	element
     * @dot11MeshHWMPperrMinInterval: the minimum interval of time (in TUs) during
     *	which a mesh STA can send only one Action frame containing a PERR
     *	element
     * @dot11MeshHWMPnetDiameterTraversalTime: the interval of time (in TUs) that
     *	it takes for an HWMP information element to propagate across the mesh
     * @dot11MeshHWMPRootMode: the configuration of a mesh STA as root mesh STA
     * @dot11MeshHWMPRannInterval: the interval of time (in TUs) between root
     *	announcements are transmitted
     * @dot11MeshGateAnnouncementProtocol: whether to advertise that this mesh
     *	station has access to a broader network beyond the MBSS. (This is
     *	missnamed in draft 12.0: dot11MeshGateAnnouncementProtocol set to true
     *	only means that the station will announce others it's a mesh gate, but
     *	not necessarily using the gate announcement protocol. Still keeping the
     *	same nomenclature to be in sync with the spec)
     * @dot11MeshForwarding: whether the Mesh STA is forwarding or non-forwarding
     *	entity (default is TRUE - forwarding entity)
     * @rssi_threshold: the threshold for average signal strength of candidate
     *	station to establish a peer link
     * @ht_opmode: mesh HT protection mode
     *
     * @dot11MeshHWMPactivePathToRootTimeout: The time (in TUs) for which mesh STAs
     *	receiving a proactive PREQ shall consider the forwarding information to
     *	the root mesh STA to be valid.
     *
     * @dot11MeshHWMProotInterval: The interval of time (in TUs) between proactive
     *	PREQs are transmitted.
     * @dot11MeshHWMPconfirmationInterval: The minimum interval of time (in TUs)
     *	during which a mesh STA can send only one Action frame containing
     *	a PREQ element for root path confirmation.
     * @power_mode: The default mesh power save mode which will be the initial
     *	setting for new peer links.
     * @dot11MeshAwakeWindowDuration: The duration in TUs the STA will remain awake
     *	after transmitting its beacon.
     * @plink_timeout: If no tx activity is seen from a STA we've established
     *	peering with for longer than this time (in seconds), then remove it
     *	from the STA's list of peers.  Default is 30 minutes.
     */
    struct mesh_config {
    	u16 dot11MeshRetryTimeout;
    	u16 dot11MeshConfirmTimeout;
    	u16 dot11MeshHoldingTimeout;
    	u16 dot11MeshMaxPeerLinks;
    	u8 dot11MeshMaxRetries;
    	u8 dot11MeshTTL;
    	u8 element_ttl;
    	bool auto_open_plinks;
    	u32 dot11MeshNbrOffsetMaxNeighbor;
    	u8 dot11MeshHWMPmaxPREQretries;
    	u32 path_refresh_time;
    	u16 min_discovery_timeout;
    	u32 dot11MeshHWMPactivePathTimeout;
    	u16 dot11MeshHWMPpreqMinInterval;
    	u16 dot11MeshHWMPperrMinInterval;
    	u16 dot11MeshHWMPnetDiameterTraversalTime;
    	u8 dot11MeshHWMPRootMode;
    	u16 dot11MeshHWMPRannInterval;
    	bool dot11MeshGateAnnouncementProtocol;
    	bool dot11MeshForwarding;
    	s32 rssi_threshold;
    	u16 ht_opmode;
    	u32 dot11MeshHWMPactivePathToRootTimeout;
    	u16 dot11MeshHWMProotInterval;
    	u16 dot11MeshHWMPconfirmationInterval;
    	enum nl80211_mesh_power_mode power_mode;
    	u16 dot11MeshAwakeWindowDuration;
    	u32 plink_timeout;
    };
    
    /**
     * struct mesh_setup - 802.11s mesh setup configuration
     * @chandef: defines the channel to use
     * @mesh_id: the mesh ID
     * @mesh_id_len: length of the mesh ID, at least 1 and at most 32 bytes
     * @sync_method: which synchronization method to use
     * @path_sel_proto: which path selection protocol to use
     * @path_metric: which metric to use
     * @auth_id: which authentication method this mesh is using
     * @ie: vendor information elements (optional)
     * @ie_len: length of vendor information elements
     * @is_authenticated: this mesh requires authentication
     * @is_secure: this mesh uses security
     * @user_mpm: userspace handles all MPM functions
     * @dtim_period: DTIM period to use
     * @beacon_interval: beacon interval to use
     * @mcast_rate: multicat rate for Mesh Node [6Mbps is the default for 802.11a]
     * @basic_rates: basic rates to use when creating the mesh
     * @beacon_rate: bitrate to be used for beacons
     *
     * These parameters are fixed when the mesh is created.
     */
    struct mesh_setup {
    	struct cfg80211_chan_def chandef;
    	const u8 *mesh_id;
    	u8 mesh_id_len;
    	u8 sync_method;
    	u8 path_sel_proto;
    	u8 path_metric;
    	u8 auth_id;
    	const u8 *ie;
    	u8 ie_len;
    	bool is_authenticated;
    	bool is_secure;
    	bool user_mpm;
    	u8 dtim_period;
    	u16 beacon_interval;
    	int mcast_rate[NUM_NL80211_BANDS];
    	u32 basic_rates;
    	struct cfg80211_bitrate_mask beacon_rate;
    };
    
    /**
     * struct ocb_setup - 802.11p OCB mode setup configuration
     * @chandef: defines the channel to use
     *
     * These parameters are fixed when connecting to the network
     */
    struct ocb_setup {
    	struct cfg80211_chan_def chandef;
    };
    
    /**
     * struct ieee80211_txq_params - TX queue parameters
     * @ac: AC identifier
     * @txop: Maximum burst time in units of 32 usecs, 0 meaning disabled
     * @cwmin: Minimum contention window [a value of the form 2^n-1 in the range
     *	1..32767]
     * @cwmax: Maximum contention window [a value of the form 2^n-1 in the range
     *	1..32767]
     * @aifs: Arbitration interframe space [0..255]
     */
    struct ieee80211_txq_params {
    	enum nl80211_ac ac;
    	u16 txop;
    	u16 cwmin;
    	u16 cwmax;
    	u8 aifs;
    };
    
    /**
     * DOC: Scanning and BSS list handling
     *
     * The scanning process itself is fairly simple, but cfg80211 offers quite
     * a bit of helper functionality. To start a scan, the scan operation will
     * be invoked with a scan definition. This scan definition contains the
     * channels to scan, and the SSIDs to send probe requests for (including the
     * wildcard, if desired). A passive scan is indicated by having no SSIDs to
     * probe. Additionally, a scan request may contain extra information elements
     * that should be added to the probe request. The IEs are guaranteed to be
     * well-formed, and will not exceed the maximum length the driver advertised
     * in the wiphy structure.
     *
     * When scanning finds a BSS, cfg80211 needs to be notified of that, because
     * it is responsible for maintaining the BSS list; the driver should not
     * maintain a list itself. For this notification, various functions exist.
     *
     * Since drivers do not maintain a BSS list, there are also a number of
     * functions to search for a BSS and obtain information about it from the
     * BSS structure cfg80211 maintains. The BSS list is also made available
     * to userspace.
     */
    
    /**
     * struct cfg80211_ssid - SSID description
     * @ssid: the SSID
     * @ssid_len: length of the ssid
     */
    struct cfg80211_ssid {
    	u8 ssid[IEEE80211_MAX_SSID_LEN];
    	u8 ssid_len;
    };
    
    /**
     * struct cfg80211_scan_info - information about completed scan
     * @scan_start_tsf: scan start time in terms of the TSF of the BSS that the
     *	wireless device that requested the scan is connected to. If this
     *	information is not available, this field is left zero.
     * @tsf_bssid: the BSSID according to which %scan_start_tsf is set.
     * @aborted: set to true if the scan was aborted for any reason,
     *	userspace will be notified of that
     */
    struct cfg80211_scan_info {
    	u64 scan_start_tsf;
    	u8 tsf_bssid[ETH_ALEN] __aligned(2);
    	bool aborted;
    };
    
    /**
     * struct cfg80211_scan_request - scan request description
     *
     * @ssids: SSIDs to scan for (active scan only)
     * @n_ssids: number of SSIDs
     * @channels: channels to scan on.
     * @n_channels: total number of channels to scan
     * @scan_width: channel width for scanning
     * @ie: optional information element(s) to add into Probe Request or %NULL
     * @ie_len: length of ie in octets
     * @duration: how long to listen on each channel, in TUs. If
     *	%duration_mandatory is not set, this is the maximum dwell time and
     *	the actual dwell time may be shorter.
     * @duration_mandatory: if set, the scan duration must be as specified by the
     *	%duration field.
     * @flags: bit field of flags controlling operation
     * @rates: bitmap of rates to advertise for each band
     * @wiphy: the wiphy this was for
     * @scan_start: time (in jiffies) when the scan started
     * @wdev: the wireless device to scan for
     * @info: (internal) information about completed scan
     * @notified: (internal) scan request was notified as done or aborted
     * @no_cck: used to send probe requests at non CCK rate in 2GHz band
     * @mac_addr: MAC address used with randomisation
     * @mac_addr_mask: MAC address mask used with randomisation, bits that
     *	are 0 in the mask should be randomised, bits that are 1 should
     *	be taken from the @mac_addr
     * @bssid: BSSID to scan for (most commonly, the wildcard BSSID)
     */
    struct cfg80211_scan_request {
    	struct cfg80211_ssid *ssids;
    	int n_ssids;
    	u32 n_channels;
    	enum nl80211_bss_scan_width scan_width;
    	const u8 *ie;
    	size_t ie_len;
    	u16 duration;
    	bool duration_mandatory;
    	u32 flags;
    
    	u32 rates[NUM_NL80211_BANDS];
    
    	struct wireless_dev *wdev;
    
    	u8 mac_addr[ETH_ALEN] __aligned(2);
    	u8 mac_addr_mask[ETH_ALEN] __aligned(2);
    	u8 bssid[ETH_ALEN] __aligned(2);
    
    	/* internal */
    	struct wiphy *wiphy;
    	unsigned long scan_start;
    	struct cfg80211_scan_info info;
    	bool notified;
    	bool no_cck;
    
    	/* keep last */
    	struct ieee80211_channel *channels[0];
    };
    
    static inline void get_random_mask_addr(u8 *buf, const u8 *addr, const u8 *mask)
    {
    	int i;
    
    	get_random_bytes(buf, ETH_ALEN);
    	for (i = 0; i < ETH_ALEN; i++) {
    		buf[i] &= ~mask[i];
    		buf[i] |= addr[i] & mask[i];
    	}
    }
    
    /**
     * struct cfg80211_match_set - sets of attributes to match
     *
     * @ssid: SSID to be matched; may be zero-length for no match (RSSI only)
     * @rssi_thold: don't report scan results below this threshold (in s32 dBm)
     */
    struct cfg80211_match_set {
    	struct cfg80211_ssid ssid;
    	s32 rssi_thold;
    };
    
    /**
     * struct cfg80211_sched_scan_plan - scan plan for scheduled scan
     *
     * @interval: interval between scheduled scan iterations. In seconds.
     * @iterations: number of scan iterations in this scan plan. Zero means
     *	infinite loop.
     *	The last scan plan will always have this parameter set to zero,
     *	all other scan plans will have a finite number of iterations.
     */
    struct cfg80211_sched_scan_plan {
    	u32 interval;
    	u32 iterations;
    };
    
    /**
     * struct cfg80211_sched_scan_request - scheduled scan request description
     *
     * @ssids: SSIDs to scan for (passed in the probe_reqs in active scans)
     * @n_ssids: number of SSIDs
     * @n_channels: total number of channels to scan
     * @scan_width: channel width for scanning
     * @ie: optional information element(s) to add into Probe Request or %NULL
     * @ie_len: length of ie in octets
     * @flags: bit field of flags controlling operation
     * @match_sets: sets of parameters to be matched for a scan result
     * 	entry to be considered valid and to be passed to the host
     * 	(others are filtered out).
     *	If ommited, all results are passed.
     * @n_match_sets: number of match sets
     * @wiphy: the wiphy this was for
     * @dev: the interface
     * @scan_start: start time of the scheduled scan
     * @channels: channels to scan
     * @min_rssi_thold: for drivers only supporting a single threshold, this
     *	contains the minimum over all matchsets
     * @mac_addr: MAC address used with randomisation
     * @mac_addr_mask: MAC address mask used with randomisation, bits that
     *	are 0 in the mask should be randomised, bits that are 1 should
     *	be taken from the @mac_addr
     * @scan_plans: scan plans to be executed in this scheduled scan. Lowest
     *	index must be executed first.
     * @n_scan_plans: number of scan plans, at least 1.
     * @rcu_head: RCU callback used to free the struct
     * @owner_nlportid: netlink portid of owner (if this should is a request
     *	owned by a particular socket)
     * @delay: delay in seconds to use before starting the first scan
     *	cycle.  The driver may ignore this parameter and start
     *	immediately (or at any other time), if this feature is not
     *	supported.
     */
    struct cfg80211_sched_scan_request {
    	struct cfg80211_ssid *ssids;
    	int n_ssids;
    	u32 n_channels;
    	enum nl80211_bss_scan_width scan_width;
    	const u8 *ie;
    	size_t ie_len;
    	u32 flags;
    	struct cfg80211_match_set *match_sets;
    	int n_match_sets;
    	s32 min_rssi_thold;
    	u32 delay;
    	struct cfg80211_sched_scan_plan *scan_plans;
    	int n_scan_plans;
    
    	u8 mac_addr[ETH_ALEN] __aligned(2);
    	u8 mac_addr_mask[ETH_ALEN] __aligned(2);
    
    	/* internal */
    	struct wiphy *wiphy;
    	struct net_device *dev;
    	unsigned long scan_start;
    	struct rcu_head rcu_head;
    	u32 owner_nlportid;
    
    	/* keep last */
    	struct ieee80211_channel *channels[0];
    };
    
    /**
     * enum cfg80211_signal_type - signal type
     *
     * @CFG80211_SIGNAL_TYPE_NONE: no signal strength information available
     * @CFG80211_SIGNAL_TYPE_MBM: signal strength in mBm (100*dBm)
     * @CFG80211_SIGNAL_TYPE_UNSPEC: signal strength, increasing from 0 through 100
     */
    enum cfg80211_signal_type {
    	CFG80211_SIGNAL_TYPE_NONE,
    	CFG80211_SIGNAL_TYPE_MBM,
    	CFG80211_SIGNAL_TYPE_UNSPEC,
    };
    
    /**
     * struct cfg80211_inform_bss - BSS inform data
     * @chan: channel the frame was received on
     * @scan_width: scan width that was used
     * @signal: signal strength value, according to the wiphy's
     *	signal type
     * @boottime_ns: timestamp (CLOCK_BOOTTIME) when the information was
     *	received; should match the time when the frame was actually
     *	received by the device (not just by the host, in case it was
     *	buffered on the device) and be accurate to about 10ms.
     *	If the frame isn't buffered, just passing the return value of
     *	ktime_get_boot_ns() is likely appropriate.
     * @parent_tsf: the time at the start of reception of the first octet of the
     *	timestamp field of the frame. The time is the TSF of the BSS specified
     *	by %parent_bssid.
     * @parent_bssid: the BSS according to which %parent_tsf is set. This is set to
     *	the BSS that requested the scan in which the beacon/probe was received.
     */
    struct cfg80211_inform_bss {
    	struct ieee80211_channel *chan;
    	enum nl80211_bss_scan_width scan_width;
    	s32 signal;
    	u64 boottime_ns;
    	u64 parent_tsf;
    	u8 parent_bssid[ETH_ALEN] __aligned(2);
    };
    
    /**
     * struct cfg80211_bss_ies - BSS entry IE data
     * @tsf: TSF contained in the frame that carried these IEs
     * @rcu_head: internal use, for freeing
     * @len: length of the IEs
     * @from_beacon: these IEs are known to come from a beacon
     * @data: IE data
     */
    struct cfg80211_bss_ies {
    	u64 tsf;
    	struct rcu_head rcu_head;
    	int len;
    	bool from_beacon;
    	u8 data[];
    };
    
    /**
     * struct cfg80211_bss - BSS description
     *
     * This structure describes a BSS (which may also be a mesh network)
     * for use in scan results and similar.
     *
     * @channel: channel this BSS is on
     * @scan_width: width of the control channel
     * @bssid: BSSID of the BSS
     * @beacon_interval: the beacon interval as from the frame
     * @capability: the capability field in host byte order
     * @ies: the information elements (Note that there is no guarantee that these
     *	are well-formed!); this is a pointer to either the beacon_ies or
     *	proberesp_ies depending on whether Probe Response frame has been
     *	received. It is always non-%NULL.
     * @beacon_ies: the information elements from the last Beacon frame
     *	(implementation note: if @hidden_beacon_bss is set this struct doesn't
     *	own the beacon_ies, but they're just pointers to the ones from the
     *	@hidden_beacon_bss struct)
     * @proberesp_ies: the information elements from the last Probe Response frame
     * @hidden_beacon_bss: in case this BSS struct represents a probe response from
     *	a BSS that hides the SSID in its beacon, this points to the BSS struct
     *	that holds the beacon data. @beacon_ies is still valid, of course, and
     *	points to the same data as hidden_beacon_bss->beacon_ies in that case.
     * @signal: signal strength value (type depends on the wiphy's signal_type)
     * @priv: private area for driver use, has at least wiphy->bss_priv_size bytes
     */
    struct cfg80211_bss {
    	struct ieee80211_channel *channel;
    	enum nl80211_bss_scan_width scan_width;
    
    	const struct cfg80211_bss_ies __rcu *ies;
    	const struct cfg80211_bss_ies __rcu *beacon_ies;
    	const struct cfg80211_bss_ies __rcu *proberesp_ies;
    
    	struct cfg80211_bss *hidden_beacon_bss;
    
    	s32 signal;
    
    	u16 beacon_interval;
    	u16 capability;
    
    	u8 bssid[ETH_ALEN];
    
    	u8 priv[0] __aligned(sizeof(void *));
    };
    
    /**
     * ieee80211_bss_get_ie - find IE with given ID
     * @bss: the bss to search
     * @ie: the IE ID
     *
     * Note that the return value is an RCU-protected pointer, so
     * rcu_read_lock() must be held when calling this function.
     * Return: %NULL if not found.
     */
    const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie);
    
    
    /**
     * struct cfg80211_auth_request - Authentication request data
     *
     * This structure provides information needed to complete IEEE 802.11
     * authentication.
     *
     * @bss: The BSS to authenticate with, the callee must obtain a reference
     *	to it if it needs to keep it.
     * @auth_type: Authentication type (algorithm)
     * @ie: Extra IEs to add to Authentication frame or %NULL
     * @ie_len: Length of ie buffer in octets
     * @key_len: length of WEP key for shared key authentication
     * @key_idx: index of WEP key for shared key authentication
     * @key: WEP key for shared key authentication
     * @sae_data: Non-IE data to use with SAE or %NULL. This starts with
     *	Authentication transaction sequence number field.
     * @sae_data_len: Length of sae_data buffer in octets
     */
    struct cfg80211_auth_request {
    	struct cfg80211_bss *bss;
    	const u8 *ie;
    	size_t ie_len;
    	enum nl80211_auth_type auth_type;
    	const u8 *key;
    	u8 key_len, key_idx;
    	const u8 *sae_data;
    	size_t sae_data_len;
    };
    
    /**
     * enum cfg80211_assoc_req_flags - Over-ride default behaviour in association.
     *
     * @ASSOC_REQ_DISABLE_HT:  Disable HT (802.11n)
     * @ASSOC_REQ_DISABLE_VHT:  Disable VHT
     * @ASSOC_REQ_USE_RRM: Declare RRM capability in this association
     */
    enum cfg80211_assoc_req_flags {
    	ASSOC_REQ_DISABLE_HT		= BIT(0),
    	ASSOC_REQ_DISABLE_VHT		= BIT(1),
    	ASSOC_REQ_USE_RRM		= BIT(2),
    };
    
    /**
     * struct cfg80211_assoc_request - (Re)Association request data
     *
     * This structure provides information needed to complete IEEE 802.11
     * (re)association.
     * @bss: The BSS to associate with. If the call is successful the driver is
     *	given a reference that it must give back to cfg80211_send_rx_assoc()
     *	or to cfg80211_assoc_timeout(). To ensure proper refcounting, new
     *	association requests while already associating must be rejected.
     * @ie: Extra IEs to add to (Re)Association Request frame or %NULL
     * @ie_len: Length of ie buffer in octets
     * @use_mfp: Use management frame protection (IEEE 802.11w) in this association
     * @crypto: crypto settings
     * @prev_bssid: previous BSSID, if not %NULL use reassociate frame. This is used
     *	to indicate a request to reassociate within the ESS instead of a request
     *	do the initial association with the ESS. When included, this is set to
     *	the BSSID of the current association, i.e., to the value that is
     *	included in the Current AP address field of the Reassociation Request
     *	frame.
     * @flags:  See &enum cfg80211_assoc_req_flags
     * @ht_capa:  HT Capabilities over-rides.  Values set in ht_capa_mask
     *	will be used in ht_capa.  Un-supported values will be ignored.
     * @ht_capa_mask:  The bits of ht_capa which are to be used.
     * @vht_capa: VHT capability override
     * @vht_capa_mask: VHT capability mask indicating which fields to use
     */
    struct cfg80211_assoc_request {
    	struct cfg80211_bss *bss;
    	const u8 *ie, *prev_bssid;
    	size_t ie_len;
    	struct cfg80211_crypto_settings crypto;
    	bool use_mfp;
    	u32 flags;
    	struct ieee80211_ht_cap ht_capa;
    	struct ieee80211_ht_cap ht_capa_mask;
    	struct ieee80211_vht_cap vht_capa, vht_capa_mask;
    };
    
    /**
     * struct cfg80211_deauth_request - Deauthentication request data
     *
     * This structure provides information needed to complete IEEE 802.11
     * deauthentication.
     *
     * @bssid: the BSSID of the BSS to deauthenticate from
     * @ie: Extra IEs to add to Deauthentication frame or %NULL
     * @ie_len: Length of ie buffer in octets
     * @reason_code: The reason code for the deauthentication
     * @local_state_change: if set, change local state only and
     *	do not set a deauth frame
     */
    struct cfg80211_deauth_request {
    	const u8 *bssid;
    	const u8 *ie;
    	size_t ie_len;
    	u16 reason_code;
    	bool local_state_change;
    };
    
    /**
     * struct cfg80211_disassoc_request - Disassociation request data
     *
     * This structure provides information needed to complete IEEE 802.11
     * disassocation.
     *
     * @bss: the BSS to disassociate from
     * @ie: Extra IEs to add to Disassociation frame or %NULL
     * @ie_len: Length of ie buffer in octets
     * @reason_code: The reason code for the disassociation
     * @local_state_change: This is a request for a local state only, i.e., no
     *	Disassociation frame is to be transmitted.
     */
    struct cfg80211_disassoc_request {
    	struct cfg80211_bss *bss;
    	const u8 *ie;
    	size_t ie_len;
    	u16 reason_code;
    	bool local_state_change;
    };
    
    /**
     * struct cfg80211_ibss_params - IBSS parameters
     *
     * This structure defines the IBSS parameters for the join_ibss()
     * method.
     *
     * @ssid: The SSID, will always be non-null.
     * @ssid_len: The length of the SSID, will always be non-zero.
     * @bssid: Fixed BSSID requested, maybe be %NULL, if set do not
     *	search for IBSSs with a different BSSID.
     * @chandef: defines the channel to use if no other IBSS to join can be found
     * @channel_fixed: The channel should be fixed -- do not search for
     *	IBSSs to join on other channels.
     * @ie: information element(s) to include in the beacon
     * @ie_len: length of that
     * @beacon_interval: beacon interval to use
     * @privacy: this is a protected network, keys will be configured
     *	after joining
     * @control_port: whether user space controls IEEE 802.1X port, i.e.,
     *	sets/clears %NL80211_STA_FLAG_AUTHORIZED. If true, the driver is
     *	required to assume that the port is unauthorized until authorized by
     *	user space. Otherwise, port is marked authorized by default.
     * @userspace_handles_dfs: whether user space controls DFS operation, i.e.
     *	changes the channel when a radar is detected. This is required
     *	to operate on DFS channels.
     * @basic_rates: bitmap of basic rates to use when creating the IBSS
     * @mcast_rate: per-band multicast rate index + 1 (0: disabled)
     * @ht_capa:  HT Capabilities over-rides.  Values set in ht_capa_mask
     *	will be used in ht_capa.  Un-supported values will be ignored.
     * @ht_capa_mask:  The bits of ht_capa which are to be used.
     */
    struct cfg80211_ibss_params {
    	const u8 *ssid;
    	const u8 *bssid;
    	struct cfg80211_chan_def chandef;
    	const u8 *ie;
    	u8 ssid_len, ie_len;
    	u16 beacon_interval;
    	u32 basic_rates;
    	bool channel_fixed;
    	bool privacy;
    	bool control_port;
    	bool userspace_handles_dfs;
    	int mcast_rate[NUM_NL80211_BANDS];
    	struct ieee80211_ht_cap ht_capa;
    	struct ieee80211_ht_cap ht_capa_mask;
    };
    
    /**
     * struct cfg80211_bss_select_adjust - BSS selection with RSSI adjustment.
     *
     * @band: band of BSS which should match for RSSI level adjustment.
     * @delta: value of RSSI level adjustment.
     */
    struct cfg80211_bss_select_adjust {
    	enum nl80211_band band;
    	s8 delta;
    };
    
    /**
     * struct cfg80211_bss_selection - connection parameters for BSS selection.
     *
     * @behaviour: requested BSS selection behaviour.
     * @param: parameters for requestion behaviour.
     * @band_pref: preferred band for %NL80211_BSS_SELECT_ATTR_BAND_PREF.
     * @adjust: parameters for %NL80211_BSS_SELECT_ATTR_RSSI_ADJUST.
     */
    struct cfg80211_bss_selection {
    	enum nl80211_bss_select_attr behaviour;
    	union {
    		enum nl80211_band band_pref;
    		struct cfg80211_bss_select_adjust adjust;
    	} param;
    };
    
    /**
     * struct cfg80211_connect_params - Connection parameters
     *
     * This structure provides information needed to complete IEEE 802.11
     * authentication and association.
     *
     * @channel: The channel to use or %NULL if not specified (auto-select based
     *	on scan results)
     * @channel_hint: The channel of the recommended BSS for initial connection or
     *	%NULL if not specified
     * @bssid: The AP BSSID or %NULL if not specified (auto-select based on scan
     *	results)
     * @bssid_hint: The recommended AP BSSID for initial connection to the BSS or
     *	%NULL if not specified. Unlike the @bssid parameter, the driver is
     *	allowed to ignore this @bssid_hint if it has knowledge of a better BSS
     *	to use.
     * @ssid: SSID
     * @ssid_len: Length of ssid in octets
     * @auth_type: Authentication type (algorithm)
     * @ie: IEs for association request
     * @ie_len: Length of assoc_ie in octets
     * @privacy: indicates whether privacy-enabled APs should be used
     * @mfp: indicate whether management frame protection is used
     * @crypto: crypto settings
     * @key_len: length of WEP key for shared key authentication
     * @key_idx: index of WEP key for shared key authentication
     * @key: WEP key for shared key authentication
     * @flags:  See &enum cfg80211_assoc_req_flags
     * @bg_scan_period:  Background scan period in seconds
     *	or -1 to indicate that default value is to be used.
     * @ht_capa:  HT Capabilities over-rides.  Values set in ht_capa_mask
     *	will be used in ht_capa.  Un-supported values will be ignored.
     * @ht_capa_mask:  The bits of ht_capa which are to be used.
     * @vht_capa:  VHT Capability overrides
     * @vht_capa_mask: The bits of vht_capa which are to be used.
     * @pbss: if set, connect to a PCP instead of AP. Valid for DMG
     *	networks.
     * @bss_select: criteria to be used for BSS selection.
     * @prev_bssid: previous BSSID, if not %NULL use reassociate frame. This is used
     *	to indicate a request to reassociate within the ESS instead of a request
     *	do the initial association with the ESS. When included, this is set to
     *	the BSSID of the current association, i.e., to the value that is
     *	included in the Current AP address field of the Reassociation Request
     *	frame.
     */
    struct cfg80211_connect_params {
    	struct ieee80211_channel *channel;
    	struct ieee80211_channel *channel_hint;
    	const u8 *bssid;
    	const u8 *bssid_hint;
    	const u8 *ssid;
    	size_t ssid_len;
    	enum nl80211_auth_type auth_type;
    	const u8 *ie;
    	size_t ie_len;
    	bool privacy;
    	enum nl80211_mfp mfp;
    	struct cfg80211_crypto_settings crypto;
    	const u8 *key;
    	u8 key_len, key_idx;
    	u32 flags;
    	int bg_scan_period;
    	struct ieee80211_ht_cap ht_capa;
    	struct ieee80211_ht_cap ht_capa_mask;
    	struct ieee80211_vht_cap vht_capa;
    	struct ieee80211_vht_cap vht_capa_mask;
    	bool pbss;
    	struct cfg80211_bss_selection bss_select;
    	const u8 *prev_bssid;
    };
    
    /**
     * enum wiphy_params_flags - set_wiphy_params bitfield values
     * @WIPHY_PARAM_RETRY_SHORT: wiphy->retry_short has changed
     * @WIPHY_PARAM_RETRY_LONG: wiphy->retry_long has changed
     * @WIPHY_PARAM_FRAG_THRESHOLD: wiphy->frag_threshold has changed
     * @WIPHY_PARAM_RTS_THRESHOLD: wiphy->rts_threshold has changed
     * @WIPHY_PARAM_COVERAGE_CLASS: coverage class changed
     * @WIPHY_PARAM_DYN_ACK: dynack has been enabled
     */
    enum wiphy_params_flags {
    	WIPHY_PARAM_RETRY_SHORT		= 1 << 0,
    	WIPHY_PARAM_RETRY_LONG		= 1 << 1,
    	WIPHY_PARAM_FRAG_THRESHOLD	= 1 << 2,
    	WIPHY_PARAM_RTS_THRESHOLD	= 1 << 3,
    	WIPHY_PARAM_COVERAGE_CLASS	= 1 << 4,
    	WIPHY_PARAM_DYN_ACK		= 1 << 5,
    };
    
    /**
     * struct cfg80211_pmksa - PMK Security Association
     *
     * This structure is passed to the set/del_pmksa() method for PMKSA
     * caching.
     *
     * @bssid: The AP's BSSID.
     * @pmkid: The PMK material itself.
     */
    struct cfg80211_pmksa {
    	const u8 *bssid;
    	const u8 *pmkid;
    };
    
    /**
     * struct cfg80211_pkt_pattern - packet pattern
     * @mask: bitmask where to match pattern and where to ignore bytes,
     *	one bit per byte, in same format as nl80211
     * @pattern: bytes to match where bitmask is 1
     * @pattern_len: length of pattern (in bytes)
     * @pkt_offset: packet offset (in bytes)
     *
     * Internal note: @mask and @pattern are allocated in one chunk of
     * memory, free @mask only!
     */
    struct cfg80211_pkt_pattern {
    	const u8 *mask, *pattern;
    	int pattern_len;
    	int pkt_offset;
    };
    
    /**
     * struct cfg80211_wowlan_tcp - TCP connection parameters
     *
     * @sock: (internal) socket for source port allocation
     * @src: source IP address
     * @dst: destination IP address
     * @dst_mac: destination MAC address
     * @src_port: source port
     * @dst_port: destination port
     * @payload_len: data payload length
     * @payload: data payload buffer
     * @payload_seq: payload sequence stamping configuration
     * @data_interval: interval at which to send data packets
     * @wake_len: wakeup payload match length
     * @wake_data: wakeup payload match data
     * @wake_mask: wakeup payload match mask
     * @tokens_size: length of the tokens buffer
     * @payload_tok: payload token usage configuration
     */
    struct cfg80211_wowlan_tcp {
    	struct socket *sock;
    	__be32 src, dst;
    	u16 src_port, dst_port;
    	u8 dst_mac[ETH_ALEN];
    	int payload_len;
    	const u8 *payload;
    	struct nl80211_wowlan_tcp_data_seq payload_seq;
    	u32 data_interval;
    	u32 wake_len;
    	const u8 *wake_data, *wake_mask;
    	u32 tokens_size;
    	/* must be last, variable member */
    	struct nl80211_wowlan_tcp_data_token payload_tok;
    };
    
    /**
     * struct cfg80211_wowlan - Wake on Wireless-LAN support info
     *
     * This structure defines the enabled WoWLAN triggers for the device.
     * @any: wake up on any activity -- special trigger if device continues
     *	operating as normal during suspend
     * @disconnect: wake up if getting disconnected
     * @magic_pkt: wake up on receiving magic packet
     * @patterns: wake up on receiving packet matching a pattern
     * @n_patterns: number of patterns
     * @gtk_rekey_failure: wake up on GTK rekey failure
     * @eap_identity_req: wake up on EAP identity request packet
     * @four_way_handshake: wake up on 4-way handshake
     * @rfkill_release: wake up when rfkill is released
     * @tcp: TCP connection establishment/wakeup parameters, see nl80211.h.
     *	NULL if not configured.
     * @nd_config: configuration for the scan to be used for net detect wake.
     */
    struct cfg80211_wowlan {
    	bool any, disconnect, magic_pkt, gtk_rekey_failure,
    	     eap_identity_req, four_way_handshake,
    	     rfkill_release;
    	struct cfg80211_pkt_pattern *patterns;
    	struct cfg80211_wowlan_tcp *tcp;
    	int n_patterns;
    	struct cfg80211_sched_scan_request *nd_config;
    };
    
    /**
     * struct cfg80211_coalesce_rules - Coalesce rule parameters
     *
     * This structure defines coalesce rule for the device.
     * @delay: maximum coalescing delay in msecs.
     * @condition: condition for packet coalescence.
     *	see &enum nl80211_coalesce_condition.
     * @patterns: array of packet patterns
     * @n_patterns: number of patterns
     */
    struct cfg80211_coalesce_rules {
    	int delay;
    	enum nl80211_coalesce_condition condition;
    	struct cfg80211_pkt_pattern *patterns;
    	int n_patterns;
    };
    
    /**
     * struct cfg80211_coalesce - Packet coalescing settings
     *
     * This structure defines coalescing settings.
     * @rules: array of coalesce rules
     * @n_rules: number of rules
     */
    struct cfg80211_coalesce {
    	struct cfg80211_coalesce_rules *rules;
    	int n_rules;
    };
    
    /**
     * struct cfg80211_wowlan_nd_match - information about the match
     *
     * @ssid: SSID of the match that triggered the wake up
     * @n_channels: Number of channels where the match occurred.  This
     *	value may be zero if the driver can't report the channels.
     * @channels: center frequencies of the channels where a match
     *	occurred (in MHz)
     */
    struct cfg80211_wowlan_nd_match {
    	struct cfg80211_ssid ssid;
    	int n_channels;
    	u32 channels[];
    };
    
    /**
     * struct cfg80211_wowlan_nd_info - net detect wake up information
     *
     * @n_matches: Number of match information instances provided in
     *	@matches.  This value may be zero if the driver can't provide
     *	match information.
     * @matches: Array of pointers to matches containing information about
     *	the matches that triggered the wake up.
     */
    struct cfg80211_wowlan_nd_info {
    	int n_matches;
    	struct cfg80211_wowlan_nd_match *matches[];
    };
    
    /**
     * struct cfg80211_wowlan_wakeup - wakeup report
     * @disconnect: woke up by getting disconnected
     * @magic_pkt: woke up by receiving magic packet
     * @gtk_rekey_failure: woke up by GTK rekey failure
     * @eap_identity_req: woke up by EAP identity request packet
     * @four_way_handshake: woke up by 4-way handshake
     * @rfkill_release: woke up by rfkill being released
     * @pattern_idx: pattern that caused wakeup, -1 if not due to pattern
     * @packet_present_len: copied wakeup packet data
     * @packet_len: original wakeup packet length
     * @packet: The packet causing the wakeup, if any.
     * @packet_80211:  For pattern match, magic packet and other data
     *	frame triggers an 802.3 frame should be reported, for
     *	disconnect due to deauth 802.11 frame. This indicates which
     *	it is.
     * @tcp_match: TCP wakeup packet received
     * @tcp_connlost: TCP connection lost or failed to establish
     * @tcp_nomoretokens: TCP data ran out of tokens
     * @net_detect: if not %NULL, woke up because of net detect
     */
    struct cfg80211_wowlan_wakeup {
    	bool disconnect, magic_pkt, gtk_rekey_failure,
    	     eap_identity_req, four_way_handshake,
    	     rfkill_release, packet_80211,
    	     tcp_match, tcp_connlost, tcp_nomoretokens;
    	s32 pattern_idx;
    	u32 packet_present_len, packet_len;
    	const void *packet;
    	struct cfg80211_wowlan_nd_info *net_detect;
    };
    
    /**
     * struct cfg80211_gtk_rekey_data - rekey data
     * @kek: key encryption key (NL80211_KEK_LEN bytes)
     * @kck: key confirmation key (NL80211_KCK_LEN bytes)
     * @replay_ctr: replay counter (NL80211_REPLAY_CTR_LEN bytes)
     */
    struct cfg80211_gtk_rekey_data {
    	const u8 *kek, *kck, *replay_ctr;
    };
    
    /**
     * struct cfg80211_update_ft_ies_params - FT IE Information
     *
     * This structure provides information needed to update the fast transition IE
     *
     * @md: The Mobility Domain ID, 2 Octet value
     * @ie: Fast Transition IEs
     * @ie_len: Length of ft_ie in octets
     */
    struct cfg80211_update_ft_ies_params {
    	u16 md;
    	const u8 *ie;
    	size_t ie_len;
    };
    
    /**
     * struct cfg80211_mgmt_tx_params - mgmt tx parameters
     *
     * This structure provides information needed to transmit a mgmt frame
     *
     * @chan: channel to use
     * @offchan: indicates wether off channel operation is required
     * @wait: duration for ROC
     * @buf: buffer to transmit
     * @len: buffer length
     * @no_cck: don't use cck rates for this frame
     * @dont_wait_for_ack: tells the low level not to wait for an ack
     * @n_csa_offsets: length of csa_offsets array
     * @csa_offsets: array of all the csa offsets in the frame
     */
    struct cfg80211_mgmt_tx_params {
    	struct ieee80211_channel *chan;
    	bool offchan;
    	unsigned int wait;
    	const u8 *buf;
    	size_t len;
    	bool no_cck;
    	bool dont_wait_for_ack;
    	int n_csa_offsets;
    	const u16 *csa_offsets;
    };
    
    /**
     * struct cfg80211_dscp_exception - DSCP exception
     *
     * @dscp: DSCP value that does not adhere to the user priority range definition
     * @up: user priority value to which the corresponding DSCP value belongs
     */
    struct cfg80211_dscp_exception {
    	u8 dscp;
    	u8 up;
    };
    
    /**
     * struct cfg80211_dscp_range - DSCP range definition for user priority
     *
     * @low: lowest DSCP value of this user priority range, inclusive
     * @high: highest DSCP value of this user priority range, inclusive
     */
    struct cfg80211_dscp_range {
    	u8 low;
    	u8 high;
    };
    
    /* QoS Map Set element length defined in IEEE Std 802.11-2012, 8.4.2.97 */
    #define IEEE80211_QOS_MAP_MAX_EX	21
    #define IEEE80211_QOS_MAP_LEN_MIN	16
    #define IEEE80211_QOS_MAP_LEN_MAX \
    	(IEEE80211_QOS_MAP_LEN_MIN + 2 * IEEE80211_QOS_MAP_MAX_EX)
    
    /**
     * struct cfg80211_qos_map - QoS Map Information
     *
     * This struct defines the Interworking QoS map setting for DSCP values
     *
     * @num_des: number of DSCP exceptions (0..21)
     * @dscp_exception: optionally up to maximum of 21 DSCP exceptions from
     *	the user priority DSCP range definition
     * @up: DSCP range definition for a particular user priority
     */
    struct cfg80211_qos_map {
    	u8 num_des;
    	struct cfg80211_dscp_exception dscp_exception[IEEE80211_QOS_MAP_MAX_EX];
    	struct cfg80211_dscp_range up[8];
    };
    
    /**
     * struct cfg80211_nan_conf - NAN configuration
     *
     * This struct defines NAN configuration parameters
     *
     * @master_pref: master preference (1 - 255)
     * @dual: dual band operation mode, see &enum nl80211_nan_dual_band_conf
     */
    struct cfg80211_nan_conf {
    	u8 master_pref;
    	u8 dual;
    };
    
    /**
     * enum cfg80211_nan_conf_changes - indicates changed fields in NAN
     * configuration
     *
     * @CFG80211_NAN_CONF_CHANGED_PREF: master preference
     * @CFG80211_NAN_CONF_CHANGED_DUAL: dual band operation
     */
    enum cfg80211_nan_conf_changes {
    	CFG80211_NAN_CONF_CHANGED_PREF = BIT(0),
    	CFG80211_NAN_CONF_CHANGED_DUAL = BIT(1),
    };
    
    /**
     * struct cfg80211_nan_func_filter - a NAN function Rx / Tx filter
     *
     * @filter: the content of the filter
     * @len: the length of the filter
     */
    struct cfg80211_nan_func_filter {
    	const u8 *filter;
    	u8 len;
    };
    
    /**
     * struct cfg80211_nan_func - a NAN function
     *
     * @type: &enum nl80211_nan_function_type
     * @service_id: the service ID of the function
     * @publish_type: &nl80211_nan_publish_type
     * @close_range: if true, the range should be limited. Threshold is
     *	implementation specific.
     * @publish_bcast: if true, the solicited publish should be broadcasted
     * @subscribe_active: if true, the subscribe is active
     * @followup_id: the instance ID for follow up
     * @followup_reqid: the requestor instance ID for follow up
     * @followup_dest: MAC address of the recipient of the follow up
     * @ttl: time to live counter in DW.
     * @serv_spec_info: Service Specific Info
     * @serv_spec_info_len: Service Specific Info length
     * @srf_include: if true, SRF is inclusive
     * @srf_bf: Bloom Filter
     * @srf_bf_len: Bloom Filter length
     * @srf_bf_idx: Bloom Filter index
     * @srf_macs: SRF MAC addresses
     * @srf_num_macs: number of MAC addresses in SRF
     * @rx_filters: rx filters that are matched with corresponding peer's tx_filter
     * @tx_filters: filters that should be transmitted in the SDF.
     * @num_rx_filters: length of &rx_filters.
     * @num_tx_filters: length of &tx_filters.
     * @instance_id: driver allocated id of the function.
     * @cookie: unique NAN function identifier.
     */
    struct cfg80211_nan_func {
    	enum nl80211_nan_function_type type;
    	u8 service_id[NL80211_NAN_FUNC_SERVICE_ID_LEN];
    	u8 publish_type;
    	bool close_range;
    	bool publish_bcast;
    	bool subscribe_active;
    	u8 followup_id;
    	u8 followup_reqid;
    	struct mac_address followup_dest;
    	u32 ttl;
    	const u8 *serv_spec_info;
    	u8 serv_spec_info_len;
    	bool srf_include;
    	const u8 *srf_bf;
    	u8 srf_bf_len;
    	u8 srf_bf_idx;
    	struct mac_address *srf_macs;
    	int srf_num_macs;
    	struct cfg80211_nan_func_filter *rx_filters;
    	struct cfg80211_nan_func_filter *tx_filters;
    	u8 num_tx_filters;
    	u8 num_rx_filters;
    	u8 instance_id;
    	u64 cookie;
    };
    
    /**
     * struct cfg80211_ops - backend description for wireless configuration
     *
     * This struct is registered by fullmac card drivers and/or wireless stacks
     * in order to handle configuration requests on their interfaces.
     *
     * All callbacks except where otherwise noted should return 0
     * on success or a negative error code.
     *
     * All operations are currently invoked under rtnl for consistency with the
     * wireless extensions but this is subject to reevaluation as soon as this
     * code is used more widely and we have a first user without wext.
     *
     * @suspend: wiphy device needs to be suspended. The variable @wow will
     *	be %NULL or contain the enabled Wake-on-Wireless triggers that are
     *	configured for the device.
     * @resume: wiphy device needs to be resumed
     * @set_wakeup: Called when WoWLAN is enabled/disabled, use this callback
     *	to call device_set_wakeup_enable() to enable/disable wakeup from
     *	the device.
     *
     * @add_virtual_intf: create a new virtual interface with the given name,
     *	must set the struct wireless_dev's iftype. Beware: You must create
     *	the new netdev in the wiphy's network namespace! Returns the struct
     *	wireless_dev, or an ERR_PTR. For P2P device wdevs, the driver must
     *	also set the address member in the wdev.
     *
     * @del_virtual_intf: remove the virtual interface
     *
     * @change_virtual_intf: change type/configuration of virtual interface,
     *	keep the struct wireless_dev's iftype updated.
     *
     * @add_key: add a key with the given parameters. @mac_addr will be %NULL
     *	when adding a group key.
     *
     * @get_key: get information about the key with the given parameters.
     *	@mac_addr will be %NULL when requesting information for a group
     *	key. All pointers given to the @callback function need not be valid
     *	after it returns. This function should return an error if it is
     *	not possible to retrieve the key, -ENOENT if it doesn't exist.
     *
     * @del_key: remove a key given the @mac_addr (%NULL for a group key)
     *	and @key_index, return -ENOENT if the key doesn't exist.
     *
     * @set_default_key: set the default key on an interface
     *
     * @set_default_mgmt_key: set the default management frame key on an interface
     *
     * @set_rekey_data: give the data necessary for GTK rekeying to the driver
     *
     * @start_ap: Start acting in AP mode defined by the parameters.
     * @change_beacon: Change the beacon parameters for an access point mode
     *	interface. This should reject the call when AP mode wasn't started.
     * @stop_ap: Stop being an AP, including stopping beaconing.
     *
     * @add_station: Add a new station.
     * @del_station: Remove a station
     * @change_station: Modify a given station. Note that flags changes are not much
     *	validated in cfg80211, in particular the auth/assoc/authorized flags
     *	might come to the driver in invalid combinations -- make sure to check
     *	them, also against the existing state! Drivers must call
     *	cfg80211_check_station_change() to validate the information.
     * @get_station: get station information for the station identified by @mac
     * @dump_station: dump station callback -- resume dump at index @idx
     *
     * @add_mpath: add a fixed mesh path
     * @del_mpath: delete a given mesh path
     * @change_mpath: change a given mesh path
     * @get_mpath: get a mesh path for the given parameters
     * @dump_mpath: dump mesh path callback -- resume dump at index @idx
     * @get_mpp: get a mesh proxy path for the given parameters
     * @dump_mpp: dump mesh proxy path callback -- resume dump at index @idx
     * @join_mesh: join the mesh network with the specified parameters
     *	(invoked with the wireless_dev mutex held)
     * @leave_mesh: leave the current mesh network
     *	(invoked with the wireless_dev mutex held)
     *
     * @get_mesh_config: Get the current mesh configuration
     *
     * @update_mesh_config: Update mesh parameters on a running mesh.
     *	The mask is a bitfield which tells us which parameters to
     *	set, and which to leave alone.
     *
     * @change_bss: Modify parameters for a given BSS.
     *
     * @set_txq_params: Set TX queue parameters
     *
     * @libertas_set_mesh_channel: Only for backward compatibility for libertas,
     *	as it doesn't implement join_mesh and needs to set the channel to
     *	join the mesh instead.
     *
     * @set_monitor_channel: Set the monitor mode channel for the device. If other
     *	interfaces are active this callback should reject the configuration.
     *	If no interfaces are active or the device is down, the channel should
     *	be stored for when a monitor interface becomes active.
     *
     * @scan: Request to do a scan. If returning zero, the scan request is given
     *	the driver, and will be valid until passed to cfg80211_scan_done().
     *	For scan results, call cfg80211_inform_bss(); you can call this outside
     *	the scan/scan_done bracket too.
     * @abort_scan: Tell the driver to abort an ongoing scan. The driver shall
     *	indicate the status of the scan through cfg80211_scan_done().
     *
     * @auth: Request to authenticate with the specified peer
     *	(invoked with the wireless_dev mutex held)
     * @assoc: Request to (re)associate with the specified peer
     *	(invoked with the wireless_dev mutex held)
     * @deauth: Request to deauthenticate from the specified peer
     *	(invoked with the wireless_dev mutex held)
     * @disassoc: Request to disassociate from the specified peer
     *	(invoked with the wireless_dev mutex held)
     *
     * @connect: Connect to the ESS with the specified parameters. When connected,
     *	call cfg80211_connect_result()/cfg80211_connect_bss() with status code
     *	%WLAN_STATUS_SUCCESS. If the connection fails for some reason, call
     *	cfg80211_connect_result()/cfg80211_connect_bss() with the status code
     *	from the AP or cfg80211_connect_timeout() if no frame with status code
     *	was received.
     *	The driver is allowed to roam to other BSSes within the ESS when the
     *	other BSS matches the connect parameters. When such roaming is initiated
     *	by the driver, the driver is expected to verify that the target matches
     *	the configured security parameters and to use Reassociation Request
     *	frame instead of Association Request frame.
     *	The connect function can also be used to request the driver to perform a
     *	specific roam when connected to an ESS. In that case, the prev_bssid
     *	parameter is set to the BSSID of the currently associated BSS as an
     *	indication of requesting reassociation.
     *	In both the driver-initiated and new connect() call initiated roaming
     *	cases, the result of roaming is indicated with a call to
     *	cfg80211_roamed() or cfg80211_roamed_bss().
     *	(invoked with the wireless_dev mutex held)
     * @disconnect: Disconnect from the BSS/ESS. Once done, call
     *	cfg80211_disconnected().
     *	(invoked with the wireless_dev mutex held)
     *
     * @join_ibss: Join the specified IBSS (or create if necessary). Once done, call
     *	cfg80211_ibss_joined(), also call that function when changing BSSID due
     *	to a merge.
     *	(invoked with the wireless_dev mutex held)
     * @leave_ibss: Leave the IBSS.
     *	(invoked with the wireless_dev mutex held)
     *
     * @set_mcast_rate: Set the specified multicast rate (only if vif is in ADHOC or
     *	MESH mode)
     *
     * @set_wiphy_params: Notify that wiphy parameters have changed;
     *	@changed bitfield (see &enum wiphy_params_flags) describes which values
     *	have changed. The actual parameter values are available in
     *	struct wiphy. If returning an error, no value should be changed.
     *
     * @set_tx_power: set the transmit power according to the parameters,
     *	the power passed is in mBm, to get dBm use MBM_TO_DBM(). The
     *	wdev may be %NULL if power was set for the wiphy, and will
     *	always be %NULL unless the driver supports per-vif TX power
     *	(as advertised by the nl80211 feature flag.)
     * @get_tx_power: store the current TX power into the dbm variable;
     *	return 0 if successful
     *
     * @set_wds_peer: set the WDS peer for a WDS interface
     *
     * @rfkill_poll: polls the hw rfkill line, use cfg80211 reporting
     *	functions to adjust rfkill hw state
     *
     * @dump_survey: get site survey information.
     *
     * @remain_on_channel: Request the driver to remain awake on the specified
     *	channel for the specified duration to complete an off-channel
     *	operation (e.g., public action frame exchange). When the driver is
     *	ready on the requested channel, it must indicate this with an event
     *	notification by calling cfg80211_ready_on_channel().
     * @cancel_remain_on_channel: Cancel an on-going remain-on-channel operation.
     *	This allows the operation to be terminated prior to timeout based on
     *	the duration value.
     * @mgmt_tx: Transmit a management frame.
     * @mgmt_tx_cancel_wait: Cancel the wait time from transmitting a management
     *	frame on another channel
     *
     * @testmode_cmd: run a test mode command; @wdev may be %NULL
     * @testmode_dump: Implement a test mode dump. The cb->args[2] and up may be
     *	used by the function, but 0 and 1 must not be touched. Additionally,
     *	return error codes other than -ENOBUFS and -ENOENT will terminate the
     *	dump and return to userspace with an error, so be careful. If any data
     *	was passed in from userspace then the data/len arguments will be present
     *	and point to the data contained in %NL80211_ATTR_TESTDATA.
     *
     * @set_bitrate_mask: set the bitrate mask configuration
     *
     * @set_pmksa: Cache a PMKID for a BSSID. This is mostly useful for fullmac
     *	devices running firmwares capable of generating the (re) association
     *	RSN IE. It allows for faster roaming between WPA2 BSSIDs.
     * @del_pmksa: Delete a cached PMKID.
     * @flush_pmksa: Flush all cached PMKIDs.
     * @set_power_mgmt: Configure WLAN power management. A timeout value of -1
     *	allows the driver to adjust the dynamic ps timeout value.
     * @set_cqm_rssi_config: Configure connection quality monitor RSSI threshold.
     *	After configuration, the driver should (soon) send an event indicating
     *	the current level is above/below the configured threshold; this may
     *	need some care when the configuration is changed (without first being
     *	disabled.)
     * @set_cqm_txe_config: Configure connection quality monitor TX error
     *	thresholds.
     * @sched_scan_start: Tell the driver to start a scheduled scan.
     * @sched_scan_stop: Tell the driver to stop an ongoing scheduled scan. This
     *	call must stop the scheduled scan and be ready for starting a new one
     *	before it returns, i.e. @sched_scan_start may be called immediately
     *	after that again and should not fail in that case. The driver should
     *	not call cfg80211_sched_scan_stopped() for a requested stop (when this
     *	method returns 0.)
     *
     * @mgmt_frame_register: Notify driver that a management frame type was
     *	registered. The callback is allowed to sleep.
     *
     * @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).
     *
     * @tdls_mgmt: Transmit a TDLS management frame.
     * @tdls_oper: Perform a high-level TDLS operation (e.g. TDLS link setup).
     *
     * @probe_client: probe an associated client, must return a cookie that it
     *	later passes to cfg80211_probe_status().
     *
     * @set_noack_map: Set the NoAck Map for the TIDs.
     *
     * @get_channel: Get the current operating channel for the virtual interface.
     *	For monitor interfaces, it should return %NULL unless there's a single
     *	current monitoring channel.
     *
     * @start_p2p_device: Start the given P2P device.
     * @stop_p2p_device: Stop the given P2P device.
     *
     * @set_mac_acl: Sets MAC address control list in AP and P2P GO mode.
     *	Parameters include ACL policy, an array of MAC address of stations
     *	and the number of MAC addresses. If there is already a list in driver
     *	this new list replaces the existing one. Driver has to clear its ACL
     *	when number of MAC addresses entries is passed as 0. Drivers which
     *	advertise the support for MAC based ACL have to implement this callback.
     *
     * @start_radar_detection: Start radar detection in the driver.
     *
     * @update_ft_ies: Provide updated Fast BSS Transition information to the
     *	driver. If the SME is in the driver/firmware, this information can be
     *	used in building Authentication and Reassociation Request frames.
     *
     * @crit_proto_start: Indicates a critical protocol needs more link reliability
     *	for a given duration (milliseconds). The protocol is provided so the
     *	driver can take the most appropriate actions.
     * @crit_proto_stop: Indicates critical protocol no longer needs increased link
     *	reliability. This operation can not fail.
     * @set_coalesce: Set coalesce parameters.
     *
     * @channel_switch: initiate channel-switch procedure (with CSA). Driver is
     *	responsible for veryfing if the switch is possible. Since this is
     *	inherently tricky driver may decide to disconnect an interface later
     *	with cfg80211_stop_iface(). This doesn't mean driver can accept
     *	everything. It should do it's best to verify requests and reject them
     *	as soon as possible.
     *
     * @set_qos_map: Set QoS mapping information to the driver
     *
     * @set_ap_chanwidth: Set the AP (including P2P GO) mode channel width for the
     *	given interface This is used e.g. for dynamic HT 20/40 MHz channel width
     *	changes during the lifetime of the BSS.
     *
     * @add_tx_ts: validate (if admitted_time is 0) or add a TX TS to the device
     *	with the given parameters; action frame exchange has been handled by
     *	userspace so this just has to modify the TX path to take the TS into
     *	account.
     *	If the admitted time is 0 just validate the parameters to make sure
     *	the session can be created at all; it is valid to just always return
     *	success for that but that may result in inefficient behaviour (handshake
     *	with the peer followed by immediate teardown when the addition is later
     *	rejected)
     * @del_tx_ts: remove an existing TX TS
     *
     * @join_ocb: join the OCB network with the specified parameters
     *	(invoked with the wireless_dev mutex held)
     * @leave_ocb: leave the current OCB network
     *	(invoked with the wireless_dev mutex held)
     *
     * @tdls_channel_switch: Start channel-switching with a TDLS peer. The driver
     *	is responsible for continually initiating channel-switching operations
     *	and returning to the base channel for communication with the AP.
     * @tdls_cancel_channel_switch: Stop channel-switching with a TDLS peer. Both
     *	peers must be on the base channel when the call completes.
     * @start_nan: Start the NAN interface.
     * @stop_nan: Stop the NAN interface.
     * @add_nan_func: Add a NAN function. Returns negative value on failure.
     *	On success @nan_func ownership is transferred to the driver and
     *	it may access it outside of the scope of this function. The driver
     *	should free the @nan_func when no longer needed by calling
     *	cfg80211_free_nan_func().
     *	On success the driver should assign an instance_id in the
     *	provided @nan_func.
     * @del_nan_func: Delete a NAN function.
     * @nan_change_conf: changes NAN configuration. The changed parameters must
     *	be specified in @changes (using &enum cfg80211_nan_conf_changes);
     *	All other parameters must be ignored.
     */
    struct cfg80211_ops {
    	int	(*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
    	int	(*resume)(struct wiphy *wiphy);
    	void	(*set_wakeup)(struct wiphy *wiphy, bool enabled);
    
    	struct wireless_dev * (*add_virtual_intf)(struct wiphy *wiphy,
    						  const char *name,
    						  unsigned char name_assign_type,
    						  enum nl80211_iftype type,
    						  u32 *flags,
    						  struct vif_params *params);
    	int	(*del_virtual_intf)(struct wiphy *wiphy,
    				    struct wireless_dev *wdev);
    	int	(*change_virtual_intf)(struct wiphy *wiphy,
    				       struct net_device *dev,
    				       enum nl80211_iftype type, u32 *flags,
    				       struct vif_params *params);
    
    	int	(*add_key)(struct wiphy *wiphy, struct net_device *netdev,
    			   u8 key_index, bool pairwise, const u8 *mac_addr,
    			   struct key_params *params);
    	int	(*get_key)(struct wiphy *wiphy, struct net_device *netdev,
    			   u8 key_index, bool pairwise, const u8 *mac_addr,
    			   void *cookie,
    			   void (*callback)(void *cookie, struct key_params*));
    	int	(*del_key)(struct wiphy *wiphy, struct net_device *netdev,
    			   u8 key_index, bool pairwise, const u8 *mac_addr);
    	int	(*set_default_key)(struct wiphy *wiphy,
    				   struct net_device *netdev,
    				   u8 key_index, bool unicast, bool multicast);
    	int	(*set_default_mgmt_key)(struct wiphy *wiphy,
    					struct net_device *netdev,
    					u8 key_index);
    
    	int	(*start_ap)(struct wiphy *wiphy, struct net_device *dev,
    			    struct cfg80211_ap_settings *settings);
    	int	(*change_beacon)(struct wiphy *wiphy, struct net_device *dev,
    				 struct cfg80211_beacon_data *info);
    	int	(*stop_ap)(struct wiphy *wiphy, struct net_device *dev);
    
    
    	int	(*add_station)(struct wiphy *wiphy, struct net_device *dev,
    			       const u8 *mac,
    			       struct station_parameters *params);
    	int	(*del_station)(struct wiphy *wiphy, struct net_device *dev,
    			       struct station_del_parameters *params);
    	int	(*change_station)(struct wiphy *wiphy, struct net_device *dev,
    				  const u8 *mac,
    				  struct station_parameters *params);
    	int	(*get_station)(struct wiphy *wiphy, struct net_device *dev,
    			       const u8 *mac, struct station_info *sinfo);
    	int	(*dump_station)(struct wiphy *wiphy, struct net_device *dev,
    				int idx, u8 *mac, struct station_info *sinfo);
    
    	int	(*add_mpath)(struct wiphy *wiphy, struct net_device *dev,
    			       const u8 *dst, const u8 *next_hop);
    	int	(*del_mpath)(struct wiphy *wiphy, struct net_device *dev,
    			       const u8 *dst);
    	int	(*change_mpath)(struct wiphy *wiphy, struct net_device *dev,
    				  const u8 *dst, const u8 *next_hop);
    	int	(*get_mpath)(struct wiphy *wiphy, struct net_device *dev,
    			     u8 *dst, u8 *next_hop, struct mpath_info *pinfo);
    	int	(*dump_mpath)(struct wiphy *wiphy, struct net_device *dev,
    			      int idx, u8 *dst, u8 *next_hop,
    			      struct mpath_info *pinfo);
    	int	(*get_mpp)(struct wiphy *wiphy, struct net_device *dev,
    			   u8 *dst, u8 *mpp, struct mpath_info *pinfo);
    	int	(*dump_mpp)(struct wiphy *wiphy, struct net_device *dev,
    			    int idx, u8 *dst, u8 *mpp,
    			    struct mpath_info *pinfo);
    	int	(*get_mesh_config)(struct wiphy *wiphy,
    				struct net_device *dev,
    				struct mesh_config *conf);
    	int	(*update_mesh_config)(struct wiphy *wiphy,
    				      struct net_device *dev, u32 mask,
    				      const struct mesh_config *nconf);
    	int	(*join_mesh)(struct wiphy *wiphy, struct net_device *dev,
    			     const struct mesh_config *conf,
    			     const struct mesh_setup *setup);
    	int	(*leave_mesh)(struct wiphy *wiphy, struct net_device *dev);
    
    	int	(*join_ocb)(struct wiphy *wiphy, struct net_device *dev,
    			    struct ocb_setup *setup);
    	int	(*leave_ocb)(struct wiphy *wiphy, struct net_device *dev);
    
    	int	(*change_bss)(struct wiphy *wiphy, struct net_device *dev,
    			      struct bss_parameters *params);
    
    	int	(*set_txq_params)(struct wiphy *wiphy, struct net_device *dev,
    				  struct ieee80211_txq_params *params);
    
    	int	(*libertas_set_mesh_channel)(struct wiphy *wiphy,
    					     struct net_device *dev,
    					     struct ieee80211_channel *chan);
    
    	int	(*set_monitor_channel)(struct wiphy *wiphy,
    				       struct cfg80211_chan_def *chandef);
    
    	int	(*scan)(struct wiphy *wiphy,
    			struct cfg80211_scan_request *request);
    	void	(*abort_scan)(struct wiphy *wiphy, struct wireless_dev *wdev);
    
    	int	(*auth)(struct wiphy *wiphy, struct net_device *dev,
    			struct cfg80211_auth_request *req);
    	int	(*assoc)(struct wiphy *wiphy, struct net_device *dev,
    			 struct cfg80211_assoc_request *req);
    	int	(*deauth)(struct wiphy *wiphy, struct net_device *dev,
    			  struct cfg80211_deauth_request *req);
    	int	(*disassoc)(struct wiphy *wiphy, struct net_device *dev,
    			    struct cfg80211_disassoc_request *req);
    
    	int	(*connect)(struct wiphy *wiphy, struct net_device *dev,
    			   struct cfg80211_connect_params *sme);
    	int	(*disconnect)(struct wiphy *wiphy, struct net_device *dev,
    			      u16 reason_code);
    
    	int	(*join_ibss)(struct wiphy *wiphy, struct net_device *dev,
    			     struct cfg80211_ibss_params *params);
    	int	(*leave_ibss)(struct wiphy *wiphy, struct net_device *dev);
    
    	int	(*set_mcast_rate)(struct wiphy *wiphy, struct net_device *dev,
    				  int rate[NUM_NL80211_BANDS]);
    
    	int	(*set_wiphy_params)(struct wiphy *wiphy, u32 changed);
    
    	int	(*set_tx_power)(struct wiphy *wiphy, struct wireless_dev *wdev,
    				enum nl80211_tx_power_setting type, int mbm);
    	int	(*get_tx_power)(struct wiphy *wiphy, struct wireless_dev *wdev,
    				int *dbm);
    
    	int	(*set_wds_peer)(struct wiphy *wiphy, struct net_device *dev,
    				const u8 *addr);
    
    	void	(*rfkill_poll)(struct wiphy *wiphy);
    
    #ifdef CONFIG_NL80211_TESTMODE
    	int	(*testmode_cmd)(struct wiphy *wiphy, struct wireless_dev *wdev,
    				void *data, int len);
    	int	(*testmode_dump)(struct wiphy *wiphy, struct sk_buff *skb,
    				 struct netlink_callback *cb,
    				 void *data, int len);
    #endif
    
    	int	(*set_bitrate_mask)(struct wiphy *wiphy,
    				    struct net_device *dev,
    				    const u8 *peer,
    				    const struct cfg80211_bitrate_mask *mask);
    
    	int	(*dump_survey)(struct wiphy *wiphy, struct net_device *netdev,
    			int idx, struct survey_info *info);
    
    	int	(*set_pmksa)(struct wiphy *wiphy, struct net_device *netdev,
    			     struct cfg80211_pmksa *pmksa);
    	int	(*del_pmksa)(struct wiphy *wiphy, struct net_device *netdev,
    			     struct cfg80211_pmksa *pmksa);
    	int	(*flush_pmksa)(struct wiphy *wiphy, struct net_device *netdev);
    
    	int	(*remain_on_channel)(struct wiphy *wiphy,
    				     struct wireless_dev *wdev,
    				     struct ieee80211_channel *chan,
    				     unsigned int duration,
    				     u64 *cookie);
    	int	(*cancel_remain_on_channel)(struct wiphy *wiphy,
    					    struct wireless_dev *wdev,
    					    u64 cookie);
    
    	int	(*mgmt_tx)(struct wiphy *wiphy, struct wireless_dev *wdev,
    			   struct cfg80211_mgmt_tx_params *params,
    			   u64 *cookie);
    	int	(*mgmt_tx_cancel_wait)(struct wiphy *wiphy,
    				       struct wireless_dev *wdev,
    				       u64 cookie);
    
    	int	(*set_power_mgmt)(struct wiphy *wiphy, struct net_device *dev,
    				  bool enabled, int timeout);
    
    	int	(*set_cqm_rssi_config)(struct wiphy *wiphy,
    				       struct net_device *dev,
    				       s32 rssi_thold, u32 rssi_hyst);
    
    	int	(*set_cqm_txe_config)(struct wiphy *wiphy,
    				      struct net_device *dev,
    				      u32 rate, u32 pkts, u32 intvl);
    
    	void	(*mgmt_frame_register)(struct wiphy *wiphy,
    				       struct wireless_dev *wdev,
    				       u16 frame_type, bool reg);
    
    	int	(*set_antenna)(struct wiphy *wiphy, u32 tx_ant, u32 rx_ant);
    	int	(*get_antenna)(struct wiphy *wiphy, u32 *tx_ant, u32 *rx_ant);
    
    	int	(*sched_scan_start)(struct wiphy *wiphy,
    				struct net_device *dev,
    				struct cfg80211_sched_scan_request *request);
    	int	(*sched_scan_stop)(struct wiphy *wiphy, struct net_device *dev);
    
    	int	(*set_rekey_data)(struct wiphy *wiphy, struct net_device *dev,
    				  struct cfg80211_gtk_rekey_data *data);
    
    	int	(*tdls_mgmt)(struct wiphy *wiphy, struct net_device *dev,
    			     const u8 *peer, u8 action_code,  u8 dialog_token,
    			     u16 status_code, u32 peer_capability,
    			     bool initiator, const u8 *buf, size_t len);
    	int	(*tdls_oper)(struct wiphy *wiphy, struct net_device *dev,
    			     const u8 *peer, enum nl80211_tdls_operation oper);
    
    	int	(*probe_client)(struct wiphy *wiphy, struct net_device *dev,
    				const u8 *peer, u64 *cookie);
    
    	int	(*set_noack_map)(struct wiphy *wiphy,
    				  struct net_device *dev,
    				  u16 noack_map);
    
    	int	(*get_channel)(struct wiphy *wiphy,
    			       struct wireless_dev *wdev,
    			       struct cfg80211_chan_def *chandef);
    
    	int	(*start_p2p_device)(struct wiphy *wiphy,
    				    struct wireless_dev *wdev);
    	void	(*stop_p2p_device)(struct wiphy *wiphy,
    				   struct wireless_dev *wdev);
    
    	int	(*set_mac_acl)(struct wiphy *wiphy, struct net_device *dev,
    			       const struct cfg80211_acl_data *params);
    
    	int	(*start_radar_detection)(struct wiphy *wiphy,
    					 struct net_device *dev,
    					 struct cfg80211_chan_def *chandef,
    					 u32 cac_time_ms);
    	int	(*update_ft_ies)(struct wiphy *wiphy, struct net_device *dev,
    				 struct cfg80211_update_ft_ies_params *ftie);
    	int	(*crit_proto_start)(struct wiphy *wiphy,
    				    struct wireless_dev *wdev,
    				    enum nl80211_crit_proto_id protocol,
    				    u16 duration);
    	void	(*crit_proto_stop)(struct wiphy *wiphy,
    				   struct wireless_dev *wdev);
    	int	(*set_coalesce)(struct wiphy *wiphy,
    				struct cfg80211_coalesce *coalesce);
    
    	int	(*channel_switch)(struct wiphy *wiphy,
    				  struct net_device *dev,
    				  struct cfg80211_csa_settings *params);
    
    	int     (*set_qos_map)(struct wiphy *wiphy,
    			       struct net_device *dev,
    			       struct cfg80211_qos_map *qos_map);
    
    	int	(*set_ap_chanwidth)(struct wiphy *wiphy, struct net_device *dev,
    				    struct cfg80211_chan_def *chandef);
    
    	int	(*add_tx_ts)(struct wiphy *wiphy, struct net_device *dev,
    			     u8 tsid, const u8 *peer, u8 user_prio,
    			     u16 admitted_time);
    	int	(*del_tx_ts)(struct wiphy *wiphy, struct net_device *dev,
    			     u8 tsid, const u8 *peer);
    
    	int	(*tdls_channel_switch)(struct wiphy *wiphy,
    				       struct net_device *dev,
    				       const u8 *addr, u8 oper_class,
    				       struct cfg80211_chan_def *chandef);
    	void	(*tdls_cancel_channel_switch)(struct wiphy *wiphy,
    					      struct net_device *dev,
    					      const u8 *addr);
    	int	(*start_nan)(struct wiphy *wiphy, struct wireless_dev *wdev,
    			     struct cfg80211_nan_conf *conf);
    	void	(*stop_nan)(struct wiphy *wiphy, struct wireless_dev *wdev);
    	int	(*add_nan_func)(struct wiphy *wiphy, struct wireless_dev *wdev,
    				struct cfg80211_nan_func *nan_func);
    	void	(*del_nan_func)(struct wiphy *wiphy, struct wireless_dev *wdev,
    			       u64 cookie);
    	int	(*nan_change_conf)(struct wiphy *wiphy,
    				   struct wireless_dev *wdev,
    				   struct cfg80211_nan_conf *conf,
    				   u32 changes);
    };
    
    /*
     * wireless hardware and networking interfaces structures
     * and registration/helper functions
     */
    
    /**
     * enum wiphy_flags - wiphy capability flags
     *
     * @WIPHY_FLAG_NETNS_OK: if not set, do not allow changing the netns of this
     *	wiphy at all
     * @WIPHY_FLAG_PS_ON_BY_DEFAULT: if set to true, powersave will be enabled
     *	by default -- this flag will be set depending on the kernel's default
     *	on wiphy_new(), but can be changed by the driver if it has a good
     *	reason to override the default
     * @WIPHY_FLAG_4ADDR_AP: supports 4addr mode even on AP (with a single station
     *	on a VLAN interface)
     * @WIPHY_FLAG_4ADDR_STATION: supports 4addr mode even as a station
     * @WIPHY_FLAG_CONTROL_PORT_PROTOCOL: This device supports setting the
     *	control port protocol ethertype. The device also honours the
     *	control_port_no_encrypt flag.
     * @WIPHY_FLAG_IBSS_RSN: The device supports IBSS RSN.
     * @WIPHY_FLAG_MESH_AUTH: The device supports mesh authentication by routing
     *	auth frames to userspace. See @NL80211_MESH_SETUP_USERSPACE_AUTH.
     * @WIPHY_FLAG_SUPPORTS_SCHED_SCAN: The device supports scheduled scans.
     * @WIPHY_FLAG_SUPPORTS_FW_ROAM: The device supports roaming feature in the
     *	firmware.
     * @WIPHY_FLAG_AP_UAPSD: The device supports uapsd on AP.
     * @WIPHY_FLAG_SUPPORTS_TDLS: The device supports TDLS (802.11z) operation.
     * @WIPHY_FLAG_TDLS_EXTERNAL_SETUP: The device does not handle TDLS (802.11z)
     *	link setup/discovery operations internally. Setup, discovery and
     *	teardown packets should be sent through the @NL80211_CMD_TDLS_MGMT
     *	command. When this flag is not set, @NL80211_CMD_TDLS_OPER should be
     *	used for asking the driver/firmware to perform a TDLS operation.
     * @WIPHY_FLAG_HAVE_AP_SME: device integrates AP SME
     * @WIPHY_FLAG_REPORTS_OBSS: the device will report beacons from other BSSes
     *	when there are virtual interfaces in AP mode by calling
     *	cfg80211_report_obss_beacon().
     * @WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD: When operating as an AP, the device
     *	responds to probe-requests in hardware.
     * @WIPHY_FLAG_OFFCHAN_TX: Device supports direct off-channel TX.
     * @WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL: Device supports remain-on-channel call.
     * @WIPHY_FLAG_SUPPORTS_5_10_MHZ: Device supports 5 MHz and 10 MHz channels.
     * @WIPHY_FLAG_HAS_CHANNEL_SWITCH: Device supports channel switch in
     *	beaconing mode (AP, IBSS, Mesh, ...).
     * @WIPHY_FLAG_HAS_STATIC_WEP: The device supports static WEP key installation
     *	before connection.
     */
    enum wiphy_flags {
    	/* use hole at 0 */
    	/* use hole at 1 */
    	/* use hole at 2 */
    	WIPHY_FLAG_NETNS_OK			= BIT(3),
    	WIPHY_FLAG_PS_ON_BY_DEFAULT		= BIT(4),
    	WIPHY_FLAG_4ADDR_AP			= BIT(5),
    	WIPHY_FLAG_4ADDR_STATION		= BIT(6),
    	WIPHY_FLAG_CONTROL_PORT_PROTOCOL	= BIT(7),
    	WIPHY_FLAG_IBSS_RSN			= BIT(8),
    	WIPHY_FLAG_MESH_AUTH			= BIT(10),
    	WIPHY_FLAG_SUPPORTS_SCHED_SCAN		= BIT(11),
    	/* use hole at 12 */
    	WIPHY_FLAG_SUPPORTS_FW_ROAM		= BIT(13),
    	WIPHY_FLAG_AP_UAPSD			= BIT(14),
    	WIPHY_FLAG_SUPPORTS_TDLS		= BIT(15),
    	WIPHY_FLAG_TDLS_EXTERNAL_SETUP		= BIT(16),
    	WIPHY_FLAG_HAVE_AP_SME			= BIT(17),
    	WIPHY_FLAG_REPORTS_OBSS			= BIT(18),
    	WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD	= BIT(19),
    	WIPHY_FLAG_OFFCHAN_TX			= BIT(20),
    	WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL	= BIT(21),
    	WIPHY_FLAG_SUPPORTS_5_10_MHZ		= BIT(22),
    	WIPHY_FLAG_HAS_CHANNEL_SWITCH		= BIT(23),
    	WIPHY_FLAG_HAS_STATIC_WEP		= BIT(24),
    };
    
    /**
     * struct ieee80211_iface_limit - limit on certain interface types
     * @max: maximum number of interfaces of these types
     * @types: interface types (bits)
     */
    struct ieee80211_iface_limit {
    	u16 max;
    	u16 types;
    };
    
    /**
     * struct ieee80211_iface_combination - possible interface combination
     * @limits: limits for the given interface types
     * @n_limits: number of limitations
     * @num_different_channels: can use up to this many different channels
     * @max_interfaces: maximum number of interfaces in total allowed in this
     *	group
     * @beacon_int_infra_match: In this combination, the beacon intervals
     *	between infrastructure and AP types must match. This is required
     *	only in special cases.
     * @radar_detect_widths: bitmap of channel widths supported for radar detection
     * @radar_detect_regions: bitmap of regions supported for radar detection
     *
     * With this structure the driver can describe which interface
     * combinations it supports concurrently.
     *
     * Examples:
     *
     * 1. Allow #STA <= 1, #AP <= 1, matching BI, channels = 1, 2 total:
     *
     *    .. code-block:: c
     *
     *	struct ieee80211_iface_limit limits1[] = {
     *		{ .max = 1, .types = BIT(NL80211_IFTYPE_STATION), },
     *		{ .max = 1, .types = BIT(NL80211_IFTYPE_AP}, },
     *	};
     *	struct ieee80211_iface_combination combination1 = {
     *		.limits = limits1,
     *		.n_limits = ARRAY_SIZE(limits1),
     *		.max_interfaces = 2,
     *		.beacon_int_infra_match = true,
     *	};
     *
     *
     * 2. Allow #{AP, P2P-GO} <= 8, channels = 1, 8 total:
     *
     *    .. code-block:: c
     *
     *	struct ieee80211_iface_limit limits2[] = {
     *		{ .max = 8, .types = BIT(NL80211_IFTYPE_AP) |
     *				     BIT(NL80211_IFTYPE_P2P_GO), },
     *	};
     *	struct ieee80211_iface_combination combination2 = {
     *		.limits = limits2,
     *		.n_limits = ARRAY_SIZE(limits2),
     *		.max_interfaces = 8,
     *		.num_different_channels = 1,
     *	};
     *
     *
     * 3. Allow #STA <= 1, #{P2P-client,P2P-GO} <= 3 on two channels, 4 total.
     *
     *    This allows for an infrastructure connection and three P2P connections.
     *
     *    .. code-block:: c
     *
     *	struct ieee80211_iface_limit limits3[] = {
     *		{ .max = 1, .types = BIT(NL80211_IFTYPE_STATION), },
     *		{ .max = 3, .types = BIT(NL80211_IFTYPE_P2P_GO) |
     *				     BIT(NL80211_IFTYPE_P2P_CLIENT), },
     *	};
     *	struct ieee80211_iface_combination combination3 = {
     *		.limits = limits3,
     *		.n_limits = ARRAY_SIZE(limits3),
     *		.max_interfaces = 4,
     *		.num_different_channels = 2,
     *	};
     *
     */
    struct ieee80211_iface_combination {
    	const struct ieee80211_iface_limit *limits;
    	u32 num_different_channels;
    	u16 max_interfaces;
    	u8 n_limits;
    	bool beacon_int_infra_match;
    	u8 radar_detect_widths;
    	u8 radar_detect_regions;
    };
    
    struct ieee80211_txrx_stypes {
    	u16 tx, rx;
    };
    
    /**
     * enum wiphy_wowlan_support_flags - WoWLAN support flags
     * @WIPHY_WOWLAN_ANY: supports wakeup for the special "any"
     *	trigger that keeps the device operating as-is and
     *	wakes up the host on any activity, for example a
     *	received packet that passed filtering; note that the
     *	packet should be preserved in that case
     * @WIPHY_WOWLAN_MAGIC_PKT: supports wakeup on magic packet
     *	(see nl80211.h)
     * @WIPHY_WOWLAN_DISCONNECT: supports wakeup on disconnect
     * @WIPHY_WOWLAN_SUPPORTS_GTK_REKEY: supports GTK rekeying while asleep
     * @WIPHY_WOWLAN_GTK_REKEY_FAILURE: supports wakeup on GTK rekey failure
     * @WIPHY_WOWLAN_EAP_IDENTITY_REQ: supports wakeup on EAP identity request
     * @WIPHY_WOWLAN_4WAY_HANDSHAKE: supports wakeup on 4-way handshake failure
     * @WIPHY_WOWLAN_RFKILL_RELEASE: supports wakeup on RF-kill release
     * @WIPHY_WOWLAN_NET_DETECT: supports wakeup on network detection
     */
    enum wiphy_wowlan_support_flags {
    	WIPHY_WOWLAN_ANY		= BIT(0),
    	WIPHY_WOWLAN_MAGIC_PKT		= BIT(1),
    	WIPHY_WOWLAN_DISCONNECT		= BIT(2),
    	WIPHY_WOWLAN_SUPPORTS_GTK_REKEY	= BIT(3),
    	WIPHY_WOWLAN_GTK_REKEY_FAILURE	= BIT(4),
    	WIPHY_WOWLAN_EAP_IDENTITY_REQ	= BIT(5),
    	WIPHY_WOWLAN_4WAY_HANDSHAKE	= BIT(6),
    	WIPHY_WOWLAN_RFKILL_RELEASE	= BIT(7),
    	WIPHY_WOWLAN_NET_DETECT		= BIT(8),
    };
    
    struct wiphy_wowlan_tcp_support {
    	const struct nl80211_wowlan_tcp_data_token_feature *tok;
    	u32 data_payload_max;
    	u32 data_interval_max;
    	u32 wake_payload_max;
    	bool seq;
    };
    
    /**
     * struct wiphy_wowlan_support - WoWLAN support data
     * @flags: see &enum wiphy_wowlan_support_flags
     * @n_patterns: number of supported wakeup patterns
     *	(see nl80211.h for the pattern definition)
     * @pattern_max_len: maximum length of each pattern
     * @pattern_min_len: minimum length of each pattern
     * @max_pkt_offset: maximum Rx packet offset
     * @max_nd_match_sets: maximum number of matchsets for net-detect,
     *	similar, but not necessarily identical, to max_match_sets for
     *	scheduled scans.
     *	See &struct cfg80211_sched_scan_request.@match_sets for more
     *	details.
     * @tcp: TCP wakeup support information
     */
    struct wiphy_wowlan_support {
    	u32 flags;
    	int n_patterns;
    	int pattern_max_len;
    	int pattern_min_len;
    	int max_pkt_offset;
    	int max_nd_match_sets;
    	const struct wiphy_wowlan_tcp_support *tcp;
    };
    
    /**
     * struct wiphy_coalesce_support - coalesce support data
     * @n_rules: maximum number of coalesce rules
     * @max_delay: maximum supported coalescing delay in msecs
     * @n_patterns: number of supported patterns in a rule
     *	(see nl80211.h for the pattern definition)
     * @pattern_max_len: maximum length of each pattern
     * @pattern_min_len: minimum length of each pattern
     * @max_pkt_offset: maximum Rx packet offset
     */
    struct wiphy_coalesce_support {
    	int n_rules;
    	int max_delay;
    	int n_patterns;
    	int pattern_max_len;
    	int pattern_min_len;
    	int max_pkt_offset;
    };
    
    /**
     * enum wiphy_vendor_command_flags - validation flags for vendor commands
     * @WIPHY_VENDOR_CMD_NEED_WDEV: vendor command requires wdev
     * @WIPHY_VENDOR_CMD_NEED_NETDEV: vendor command requires netdev
     * @WIPHY_VENDOR_CMD_NEED_RUNNING: interface/wdev must be up & running
     *	(must be combined with %_WDEV or %_NETDEV)
     */
    enum wiphy_vendor_command_flags {
    	WIPHY_VENDOR_CMD_NEED_WDEV = BIT(0),
    	WIPHY_VENDOR_CMD_NEED_NETDEV = BIT(1),
    	WIPHY_VENDOR_CMD_NEED_RUNNING = BIT(2),
    };
    
    /**
     * struct wiphy_vendor_command - vendor command definition
     * @info: vendor command identifying information, as used in nl80211
     * @flags: flags, see &enum wiphy_vendor_command_flags
     * @doit: callback for the operation, note that wdev is %NULL if the
     *	flags didn't ask for a wdev and non-%NULL otherwise; the data
     *	pointer may be %NULL if userspace provided no data at all
     * @dumpit: dump callback, for transferring bigger/multiple items. The
     *	@storage points to cb->args[5], ie. is preserved over the multiple
     *	dumpit calls.
     * It's recommended to not have the same sub command with both @doit and
     * @dumpit, so that userspace can assume certain ones are get and others
     * are used with dump requests.
     */
    struct wiphy_vendor_command {
    	struct nl80211_vendor_cmd_info info;
    	u32 flags;
    	int (*doit)(struct wiphy *wiphy, struct wireless_dev *wdev,
    		    const void *data, int data_len);
    	int (*dumpit)(struct wiphy *wiphy, struct wireless_dev *wdev,
    		      struct sk_buff *skb, const void *data, int data_len,
    		      unsigned long *storage);
    };
    
    /**
     * struct wiphy_iftype_ext_capab - extended capabilities per interface type
     * @iftype: interface type
     * @extended_capabilities: extended capabilities supported by the driver,
     *	additional capabilities might be supported by userspace; these are the
     *	802.11 extended capabilities ("Extended Capabilities element") and are
     *	in the same format as in the information element. See IEEE Std
     *	802.11-2012 8.4.2.29 for the defined fields.
     * @extended_capabilities_mask: mask of the valid values
     * @extended_capabilities_len: length of the extended capabilities
     */
    struct wiphy_iftype_ext_capab {
    	enum nl80211_iftype iftype;
    	const u8 *extended_capabilities;
    	const u8 *extended_capabilities_mask;
    	u8 extended_capabilities_len;
    };
    
    /**
     * struct wiphy - wireless hardware description
     * @reg_notifier: the driver's regulatory notification callback,
     *	note that if your driver uses wiphy_apply_custom_regulatory()
     *	the reg_notifier's request can be passed as NULL
     * @regd: the driver's regulatory domain, if one was requested via
     * 	the regulatory_hint() API. This can be used by the driver
     *	on the reg_notifier() if it chooses to ignore future
     *	regulatory domain changes caused by other drivers.
     * @signal_type: signal type reported in &struct cfg80211_bss.
     * @cipher_suites: supported cipher suites
     * @n_cipher_suites: number of supported cipher suites
     * @retry_short: Retry limit for short frames (dot11ShortRetryLimit)
     * @retry_long: Retry limit for long frames (dot11LongRetryLimit)
     * @frag_threshold: Fragmentation threshold (dot11FragmentationThreshold);
     *	-1 = fragmentation disabled, only odd values >= 256 used
     * @rts_threshold: RTS threshold (dot11RTSThreshold); -1 = RTS/CTS disabled
     * @_net: the network namespace this wiphy currently lives in
     * @perm_addr: permanent MAC address of this device
     * @addr_mask: If the device supports multiple MAC addresses by masking,
     *	set this to a mask with variable bits set to 1, e.g. if the last
     *	four bits are variable then set it to 00-00-00-00-00-0f. The actual
     *	variable bits shall be determined by the interfaces added, with
     *	interfaces not matching the mask being rejected to be brought up.
     * @n_addresses: number of addresses in @addresses.
     * @addresses: If the device has more than one address, set this pointer
     *	to a list of addresses (6 bytes each). The first one will be used
     *	by default for perm_addr. In this case, the mask should be set to
     *	all-zeroes. In this case it is assumed that the device can handle
     *	the same number of arbitrary MAC addresses.
     * @registered: protects ->resume and ->suspend sysfs callbacks against
     *	unregister hardware
     * @debugfsdir: debugfs directory used for this wiphy, will be renamed
     *	automatically on wiphy renames
     * @dev: (virtual) struct device for this wiphy
     * @registered: helps synchronize suspend/resume with wiphy unregister
     * @wext: wireless extension handlers
     * @priv: driver private data (sized according to wiphy_new() parameter)
     * @interface_modes: bitmask of interfaces types valid for this wiphy,
     *	must be set by driver
     * @iface_combinations: Valid interface combinations array, should not
     *	list single interface types.
     * @n_iface_combinations: number of entries in @iface_combinations array.
     * @software_iftypes: bitmask of software interface types, these are not
     *	subject to any restrictions since they are purely managed in SW.
     * @flags: wiphy flags, see &enum wiphy_flags
     * @regulatory_flags: wiphy regulatory flags, see
     *	&enum ieee80211_regulatory_flags
     * @features: features advertised to nl80211, see &enum nl80211_feature_flags.
     * @ext_features: extended features advertised to nl80211, see
     *	&enum nl80211_ext_feature_index.
     * @bss_priv_size: each BSS struct has private data allocated with it,
     *	this variable determines its size
     * @max_scan_ssids: maximum number of SSIDs the device can scan for in
     *	any given scan
     * @max_sched_scan_ssids: maximum number of SSIDs the device can scan
     *	for in any given scheduled scan
     * @max_match_sets: maximum number of match sets the device can handle
     *	when performing a scheduled scan, 0 if filtering is not
     *	supported.
     * @max_scan_ie_len: maximum length of user-controlled IEs device can
     *	add to probe request frames transmitted during a scan, must not
     *	include fixed IEs like supported rates
     * @max_sched_scan_ie_len: same as max_scan_ie_len, but for scheduled
     *	scans
     * @max_sched_scan_plans: maximum number of scan plans (scan interval and number
     *	of iterations) for scheduled scan supported by the device.
     * @max_sched_scan_plan_interval: maximum interval (in seconds) for a
     *	single scan plan supported by the device.
     * @max_sched_scan_plan_iterations: maximum number of iterations for a single
     *	scan plan supported by the device.
     * @coverage_class: current coverage class
     * @fw_version: firmware version for ethtool reporting
     * @hw_version: hardware version for ethtool reporting
     * @max_num_pmkids: maximum number of PMKIDs supported by device
     * @privid: a pointer that drivers can use to identify if an arbitrary
     *	wiphy is theirs, e.g. in global notifiers
     * @bands: information about bands/channels supported by this device
     *
     * @mgmt_stypes: bitmasks of frame subtypes that can be subscribed to or
     *	transmitted through nl80211, points to an array indexed by interface
     *	type
     *
     * @available_antennas_tx: bitmap of antennas which are available to be
     *	configured as TX antennas. Antenna configuration commands will be
     *	rejected unless this or @available_antennas_rx is set.
     *
     * @available_antennas_rx: bitmap of antennas which are available to be
     *	configured as RX antennas. Antenna configuration commands will be
     *	rejected unless this or @available_antennas_tx is set.
     *
     * @probe_resp_offload:
     *	 Bitmap of supported protocols for probe response offloading.
     *	 See &enum nl80211_probe_resp_offload_support_attr. Only valid
     *	 when the wiphy flag @WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD is set.
     *
     * @max_remain_on_channel_duration: Maximum time a remain-on-channel operation
     *	may request, if implemented.
     *
     * @wowlan: WoWLAN support information
     * @wowlan_config: current WoWLAN configuration; this should usually not be
     *	used since access to it is necessarily racy, use the parameter passed
     *	to the suspend() operation instead.
     *
     * @ap_sme_capa: AP SME capabilities, flags from &enum nl80211_ap_sme_features.
     * @ht_capa_mod_mask:  Specify what ht_cap values can be over-ridden.
     *	If null, then none can be over-ridden.
     * @vht_capa_mod_mask:  Specify what VHT capabilities can be over-ridden.
     *	If null, then none can be over-ridden.
     *
     * @wdev_list: the list of associated (virtual) interfaces; this list must
     *	not be modified by the driver, but can be read with RTNL/RCU protection.
     *
     * @max_acl_mac_addrs: Maximum number of MAC addresses that the device
     *	supports for ACL.
     *
     * @extended_capabilities: extended capabilities supported by the driver,
     *	additional capabilities might be supported by userspace; these are
     *	the 802.11 extended capabilities ("Extended Capabilities element")
     *	and are in the same format as in the information element. See
     *	802.11-2012 8.4.2.29 for the defined fields. These are the default
     *	extended capabilities to be used if the capabilities are not specified
     *	for a specific interface type in iftype_ext_capab.
     * @extended_capabilities_mask: mask of the valid values
     * @extended_capabilities_len: length of the extended capabilities
     * @iftype_ext_capab: array of extended capabilities per interface type
     * @num_iftype_ext_capab: number of interface types for which extended
     *	capabilities are specified separately.
     * @coalesce: packet coalescing support information
     *
     * @vendor_commands: array of vendor commands supported by the hardware
     * @n_vendor_commands: number of vendor commands
     * @vendor_events: array of vendor events supported by the hardware
     * @n_vendor_events: number of vendor events
     *
     * @max_ap_assoc_sta: maximum number of associated stations supported in AP mode
     *	(including P2P GO) or 0 to indicate no such limit is advertised. The
     *	driver is allowed to advertise a theoretical limit that it can reach in
     *	some cases, but may not always reach.
     *
     * @max_num_csa_counters: Number of supported csa_counters in beacons
     *	and probe responses.  This value should be set if the driver
     *	wishes to limit the number of csa counters. Default (0) means
     *	infinite.
     * @max_adj_channel_rssi_comp: max offset of between the channel on which the
     *	frame was sent and the channel on which the frame was heard for which
     *	the reported rssi is still valid. If a driver is able to compensate the
     *	low rssi when a frame is heard on different channel, then it should set
     *	this variable to the maximal offset for which it can compensate.
     *	This value should be set in MHz.
     * @bss_select_support: bitmask indicating the BSS selection criteria supported
     *	by the driver in the .connect() callback. The bit position maps to the
     *	attribute indices defined in &enum nl80211_bss_select_attr.
     *
     * @cookie_counter: unique generic cookie counter, used to identify objects.
     */
    struct wiphy {
    	/* assign these fields before you register the wiphy */
    
    	/* permanent MAC address(es) */
    	u8 perm_addr[ETH_ALEN];
    	u8 addr_mask[ETH_ALEN];
    
    	struct mac_address *addresses;
    
    	const struct ieee80211_txrx_stypes *mgmt_stypes;
    
    	const struct ieee80211_iface_combination *iface_combinations;
    	int n_iface_combinations;
    	u16 software_iftypes;
    
    	u16 n_addresses;
    
    	/* Supported interface modes, OR together BIT(NL80211_IFTYPE_...) */
    	u16 interface_modes;
    
    	u16 max_acl_mac_addrs;
    
    	u32 flags, regulatory_flags, features;
    	u8 ext_features[DIV_ROUND_UP(NUM_NL80211_EXT_FEATURES, 8)];
    
    	u32 ap_sme_capa;
    
    	enum cfg80211_signal_type signal_type;
    
    	int bss_priv_size;
    	u8 max_scan_ssids;
    	u8 max_sched_scan_ssids;
    	u8 max_match_sets;
    	u16 max_scan_ie_len;
    	u16 max_sched_scan_ie_len;
    	u32 max_sched_scan_plans;
    	u32 max_sched_scan_plan_interval;
    	u32 max_sched_scan_plan_iterations;
    
    	int n_cipher_suites;
    	const u32 *cipher_suites;
    
    	u8 retry_short;
    	u8 retry_long;
    	u32 frag_threshold;
    	u32 rts_threshold;
    	u8 coverage_class;
    
    	char fw_version[ETHTOOL_FWVERS_LEN];
    	u32 hw_version;
    
    #ifdef CONFIG_PM
    	const struct wiphy_wowlan_support *wowlan;
    	struct cfg80211_wowlan *wowlan_config;
    #endif
    
    	u16 max_remain_on_channel_duration;
    
    	u8 max_num_pmkids;
    
    	u32 available_antennas_tx;
    	u32 available_antennas_rx;
    
    	/*
    	 * Bitmap of supported protocols for probe response offloading
    	 * see &enum nl80211_probe_resp_offload_support_attr. Only valid
    	 * when the wiphy flag @WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD is set.
    	 */
    	u32 probe_resp_offload;
    
    	const u8 *extended_capabilities, *extended_capabilities_mask;
    	u8 extended_capabilities_len;
    
    	const struct wiphy_iftype_ext_capab *iftype_ext_capab;
    	unsigned int num_iftype_ext_capab;
    
    	/* If multiple wiphys are registered and you're handed e.g.
    	 * a regular netdev with assigned ieee80211_ptr, you won't
    	 * know whether it points to a wiphy your driver has registered
    	 * or not. Assign this to something global to your driver to
    	 * help determine whether you own this wiphy or not. */
    	const void *privid;
    
    	struct ieee80211_supported_band *bands[NUM_NL80211_BANDS];
    
    	/* Lets us get back the wiphy on the callback */
    	void (*reg_notifier)(struct wiphy *wiphy,
    			     struct regulatory_request *request);
    
    	/* fields below are read-only, assigned by cfg80211 */
    
    	const struct ieee80211_regdomain __rcu *regd;
    
    	/* the item in /sys/class/ieee80211/ points to this,
    	 * you need use set_wiphy_dev() (see below) */
    	struct device dev;
    
    	/* protects ->resume, ->suspend sysfs callbacks against unregister hw */
    	bool registered;
    
    	/* dir in debugfs: ieee80211/<wiphyname> */
    	struct dentry *debugfsdir;
    
    	const struct ieee80211_ht_cap *ht_capa_mod_mask;
    	const struct ieee80211_vht_cap *vht_capa_mod_mask;
    
    	struct list_head wdev_list;
    
    	/* the network namespace this phy lives in currently */
    	possible_net_t _net;
    
    #ifdef CONFIG_CFG80211_WEXT
    	const struct iw_handler_def *wext;
    #endif
    
    	const struct wiphy_coalesce_support *coalesce;
    
    	const struct wiphy_vendor_command *vendor_commands;
    	const struct nl80211_vendor_cmd_info *vendor_events;
    	int n_vendor_commands, n_vendor_events;
    
    	u16 max_ap_assoc_sta;
    
    	u8 max_num_csa_counters;
    	u8 max_adj_channel_rssi_comp;
    
    	u32 bss_select_support;
    
    	u64 cookie_counter;
    
    	char priv[0] __aligned(NETDEV_ALIGN);
    };
    
    static inline struct net *wiphy_net(struct wiphy *wiphy)
    {
    	return read_pnet(&wiphy->_net);
    }
    
    static inline void wiphy_net_set(struct wiphy *wiphy, struct net *net)
    {
    	write_pnet(&wiphy->_net, net);
    }
    
    /**
     * wiphy_priv - return priv from wiphy
     *
     * @wiphy: the wiphy whose priv pointer to return
     * Return: The priv of @wiphy.
     */
    static inline void *wiphy_priv(struct wiphy *wiphy)
    {
    	BUG_ON(!wiphy);
    	return &wiphy->priv;
    }
    
    /**
     * priv_to_wiphy - return the wiphy containing the priv
     *
     * @priv: a pointer previously returned by wiphy_priv
     * Return: The wiphy of @priv.
     */
    static inline struct wiphy *priv_to_wiphy(void *priv)
    {
    	BUG_ON(!priv);
    	return container_of(priv, struct wiphy, priv);
    }
    
    /**
     * set_wiphy_dev - set device pointer for wiphy
     *
     * @wiphy: The wiphy whose device to bind
     * @dev: The device to parent it to
     */
    static inline void set_wiphy_dev(struct wiphy *wiphy, struct device *dev)
    {
    	wiphy->dev.parent = dev;
    }
    
    /**
     * wiphy_dev - get wiphy dev pointer
     *
     * @wiphy: The wiphy whose device struct to look up
     * Return: The dev of @wiphy.
     */
    static inline struct device *wiphy_dev(struct wiphy *wiphy)
    {
    	return wiphy->dev.parent;
    }
    
    /**
     * wiphy_name - get wiphy name
     *
     * @wiphy: The wiphy whose name to return
     * Return: The name of @wiphy.
     */
    static inline const char *wiphy_name(const struct wiphy *wiphy)
    {
    	return dev_name(&wiphy->dev);
    }
    
    /**
     * wiphy_new_nm - create a new wiphy for use with cfg80211
     *
     * @ops: The configuration operations for this device
     * @sizeof_priv: The size of the private area to allocate
     * @requested_name: Request a particular name.
     *	NULL is valid value, and means use the default phy%d naming.
     *
     * Create a new wiphy and associate the given operations with it.
     * @sizeof_priv bytes are allocated for private use.
     *
     * Return: A pointer to the new wiphy. This pointer must be
     * assigned to each netdev's ieee80211_ptr for proper operation.
     */
    struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
    			   const char *requested_name);
    
    /**
     * wiphy_new - create a new wiphy for use with cfg80211
     *
     * @ops: The configuration operations for this device
     * @sizeof_priv: The size of the private area to allocate
     *
     * Create a new wiphy and associate the given operations with it.
     * @sizeof_priv bytes are allocated for private use.
     *
     * Return: A pointer to the new wiphy. This pointer must be
     * assigned to each netdev's ieee80211_ptr for proper operation.
     */
    static inline struct wiphy *wiphy_new(const struct cfg80211_ops *ops,
    				      int sizeof_priv)
    {
    	return wiphy_new_nm(ops, sizeof_priv, NULL);
    }
    
    /**
     * wiphy_register - register a wiphy with cfg80211
     *
     * @wiphy: The wiphy to register.
     *
     * Return: A non-negative wiphy index or a negative error code.
     */
    int wiphy_register(struct wiphy *wiphy);
    
    /**
     * wiphy_unregister - deregister a wiphy from cfg80211
     *
     * @wiphy: The wiphy to unregister.
     *
     * After this call, no more requests can be made with this priv
     * pointer, but the call may sleep to wait for an outstanding
     * request that is being handled.
     */
    void wiphy_unregister(struct wiphy *wiphy);
    
    /**
     * wiphy_free - free wiphy
     *
     * @wiphy: The wiphy to free
     */
    void wiphy_free(struct wiphy *wiphy);
    
    /* internal structs */
    struct cfg80211_conn;
    struct cfg80211_internal_bss;
    struct cfg80211_cached_keys;
    
    /**
     * struct wireless_dev - wireless device state
     *
     * For netdevs, this structure must be allocated by the driver
     * that uses the ieee80211_ptr field in struct net_device (this
     * is intentional so it can be allocated along with the netdev.)
     * It need not be registered then as netdev registration will
     * be intercepted by cfg80211 to see the new wireless device.
     *
     * For non-netdev uses, it must also be allocated by the driver
     * in response to the cfg80211 callbacks that require it, as
     * there's no netdev registration in that case it may not be
     * allocated outside of callback operations that return it.
     *
     * @wiphy: pointer to hardware description
     * @iftype: interface type
     * @list: (private) Used to collect the interfaces
     * @netdev: (private) Used to reference back to the netdev, may be %NULL
     * @identifier: (private) Identifier used in nl80211 to identify this
     *	wireless device if it has no netdev
     * @current_bss: (private) Used by the internal configuration code
     * @chandef: (private) Used by the internal configuration code to track
     *	the user-set channel definition.
     * @preset_chandef: (private) Used by the internal configuration code to
     *	track the channel to be used for AP later
     * @bssid: (private) Used by the internal configuration code
     * @ssid: (private) Used by the internal configuration code
     * @ssid_len: (private) Used by the internal configuration code
     * @mesh_id_len: (private) Used by the internal configuration code
     * @mesh_id_up_len: (private) Used by the internal configuration code
     * @wext: (private) Used by the internal wireless extensions compat code
     * @use_4addr: indicates 4addr mode is used on this interface, must be
     *	set by driver (if supported) on add_interface BEFORE registering the
     *	netdev and may otherwise be used by driver read-only, will be update
     *	by cfg80211 on change_interface
     * @mgmt_registrations: list of registrations for management frames
     * @mgmt_registrations_lock: lock for the list
     * @mtx: mutex used to lock data in this struct, may be used by drivers
     *	and some API functions require it held
     * @beacon_interval: beacon interval used on this device for transmitting
     *	beacons, 0 when not valid
     * @address: The address for this device, valid only if @netdev is %NULL
     * @p2p_started: true if this is a P2P Device that has been started
     * @nan_started: true if this is a NAN interface that has been started
     * @cac_started: true if DFS channel availability check has been started
     * @cac_start_time: timestamp (jiffies) when the dfs state was entered.
     * @cac_time_ms: CAC time in ms
     * @ps: powersave mode is enabled
     * @ps_timeout: dynamic powersave timeout
     * @ap_unexpected_nlportid: (private) netlink port ID of application
     *	registered for unexpected class 3 frames (AP mode)
     * @conn: (private) cfg80211 software SME connection state machine data
     * @connect_keys: (private) keys to set after connection is established
     * @conn_bss_type: connecting/connected BSS type
     * @ibss_fixed: (private) IBSS is using fixed BSSID
     * @ibss_dfs_possible: (private) IBSS may change to a DFS channel
     * @event_list: (private) list for internal event processing
     * @event_lock: (private) lock for event list
     * @owner_nlportid: (private) owner socket port ID
     */
    struct wireless_dev {
    	struct wiphy *wiphy;
    	enum nl80211_iftype iftype;
    
    	/* the remainder of this struct should be private to cfg80211 */
    	struct list_head list;
    	struct net_device *netdev;
    
    	u32 identifier;
    
    	struct list_head mgmt_registrations;
    	spinlock_t mgmt_registrations_lock;
    
    	struct mutex mtx;
    
    	bool use_4addr, p2p_started, nan_started;
    
    	u8 address[ETH_ALEN] __aligned(sizeof(u16));
    
    	/* currently used for IBSS and SME - might be rearranged later */
    	u8 ssid[IEEE80211_MAX_SSID_LEN];
    	u8 ssid_len, mesh_id_len, mesh_id_up_len;
    	struct cfg80211_conn *conn;
    	struct cfg80211_cached_keys *connect_keys;
    	enum ieee80211_bss_type conn_bss_type;
    
    	struct list_head event_list;
    	spinlock_t event_lock;
    
    	struct cfg80211_internal_bss *current_bss; /* associated / joined */
    	struct cfg80211_chan_def preset_chandef;
    	struct cfg80211_chan_def chandef;
    
    	bool ibss_fixed;
    	bool ibss_dfs_possible;
    
    	bool ps;
    	int ps_timeout;
    
    	int beacon_interval;
    
    	u32 ap_unexpected_nlportid;
    
    	bool cac_started;
    	unsigned long cac_start_time;
    	unsigned int cac_time_ms;
    
    	u32 owner_nlportid;
    
    #ifdef CONFIG_CFG80211_WEXT
    	/* wext data */
    	struct {
    		struct cfg80211_ibss_params ibss;
    		struct cfg80211_connect_params connect;
    		struct cfg80211_cached_keys *keys;
    		const u8 *ie;
    		size_t ie_len;
    		u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
    		u8 ssid[IEEE80211_MAX_SSID_LEN];
    		s8 default_key, default_mgmt_key;
    		bool prev_bssid_valid;
    	} wext;
    #endif
    };
    
    static inline u8 *wdev_address(struct wireless_dev *wdev)
    {
    	if (wdev->netdev)
    		return wdev->netdev->dev_addr;
    	return wdev->address;
    }
    
    /**
     * wdev_priv - return wiphy priv from wireless_dev
     *
     * @wdev: The wireless device whose wiphy's priv pointer to return
     * Return: The wiphy priv of @wdev.
     */
    static inline void *wdev_priv(struct wireless_dev *wdev)
    {
    	BUG_ON(!wdev);
    	return wiphy_priv(wdev->wiphy);
    }
    
    /**
     * DOC: Utility functions
     *
     * cfg80211 offers a number of utility functions that can be useful.
     */
    
    /**
     * ieee80211_channel_to_frequency - convert channel number to frequency
     * @chan: channel number
     * @band: band, necessary due to channel number overlap
     * Return: The corresponding frequency (in MHz), or 0 if the conversion failed.
     */
    int ieee80211_channel_to_frequency(int chan, enum nl80211_band band);
    
    /**
     * ieee80211_frequency_to_channel - convert frequency to channel number
     * @freq: center frequency
     * Return: The corresponding channel, or 0 if the conversion failed.
     */
    int ieee80211_frequency_to_channel(int freq);
    
    /*
     * Name indirection necessary because the ieee80211 code also has
     * a function named "ieee80211_get_channel", so if you include
     * cfg80211's header file you get cfg80211's version, if you try
     * to include both header files you'll (rightfully!) get a symbol
     * clash.
     */
    struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
    						  int freq);
    /**
     * ieee80211_get_channel - get channel struct from wiphy for specified frequency
     * @wiphy: the struct wiphy to get the channel for
     * @freq: the center frequency of the channel
     * Return: The channel struct from @wiphy at @freq.
     */
    static inline struct ieee80211_channel *
    ieee80211_get_channel(struct wiphy *wiphy, int freq)
    {
    	return __ieee80211_get_channel(wiphy, freq);
    }
    
    /**
     * ieee80211_get_response_rate - get basic rate for a given rate
     *
     * @sband: the band to look for rates in
     * @basic_rates: bitmap of basic rates
     * @bitrate: the bitrate for which to find the basic rate
     *
     * Return: The basic rate corresponding to a given bitrate, that
     * is the next lower bitrate contained in the basic rate map,
     * which is, for this function, given as a bitmap of indices of
     * rates in the band's bitrate table.
     */
    struct ieee80211_rate *
    ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
    			    u32 basic_rates, int bitrate);
    
    /**
     * ieee80211_mandatory_rates - get mandatory rates for a given band
     * @sband: the band to look for rates in
     * @scan_width: width of the control channel
     *
     * This function returns a bitmap of the mandatory rates for the given
     * band, bits are set according to the rate position in the bitrates array.
     */
    u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
    			      enum nl80211_bss_scan_width scan_width);
    
    /*
     * Radiotap parsing functions -- for controlled injection support
     *
     * Implemented in net/wireless/radiotap.c
     * Documentation in Documentation/networking/radiotap-headers.txt
     */
    
    struct radiotap_align_size {
    	uint8_t align:4, size:4;
    };
    
    struct ieee80211_radiotap_namespace {
    	const struct radiotap_align_size *align_size;
    	int n_bits;
    	uint32_t oui;
    	uint8_t subns;
    };
    
    struct ieee80211_radiotap_vendor_namespaces {
    	const struct ieee80211_radiotap_namespace *ns;
    	int n_ns;
    };
    
    /**
     * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args
     * @this_arg_index: index of current arg, valid after each successful call
     *	to ieee80211_radiotap_iterator_next()
     * @this_arg: pointer to current radiotap arg; it is valid after each
     *	call to ieee80211_radiotap_iterator_next() but also after
     *	ieee80211_radiotap_iterator_init() where it will point to
     *	the beginning of the actual data portion
     * @this_arg_size: length of the current arg, for convenience
     * @current_namespace: pointer to the current namespace definition
     *	(or internally %NULL if the current namespace is unknown)
     * @is_radiotap_ns: indicates whether the current namespace is the default
     *	radiotap namespace or not
     *
     * @_rtheader: pointer to the radiotap header we are walking through
     * @_max_length: length of radiotap header in cpu byte ordering
     * @_arg_index: next argument index
     * @_arg: next argument pointer
     * @_next_bitmap: internal pointer to next present u32
     * @_bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present
     * @_vns: vendor namespace definitions
     * @_next_ns_data: beginning of the next namespace's data
     * @_reset_on_ext: internal; reset the arg index to 0 when going to the
     *	next bitmap word
     *
     * Describes the radiotap parser state. Fields prefixed with an underscore
     * must not be used by users of the parser, only by the parser internally.
     */
    
    struct ieee80211_radiotap_iterator {
    	struct ieee80211_radiotap_header *_rtheader;
    	const struct ieee80211_radiotap_vendor_namespaces *_vns;
    	const struct ieee80211_radiotap_namespace *current_namespace;
    
    	unsigned char *_arg, *_next_ns_data;
    	__le32 *_next_bitmap;
    
    	unsigned char *this_arg;
    	int this_arg_index;
    	int this_arg_size;
    
    	int is_radiotap_ns;
    
    	int _max_length;
    	int _arg_index;
    	uint32_t _bitmap_shifter;
    	int _reset_on_ext;
    };
    
    int
    ieee80211_radiotap_iterator_init(struct ieee80211_radiotap_iterator *iterator,
    				 struct ieee80211_radiotap_header *radiotap_header,
    				 int max_length,
    				 const struct ieee80211_radiotap_vendor_namespaces *vns);
    
    int
    ieee80211_radiotap_iterator_next(struct ieee80211_radiotap_iterator *iterator);
    
    
    extern const unsigned char rfc1042_header[6];
    extern const unsigned char bridge_tunnel_header[6];
    
    /**
     * ieee80211_get_hdrlen_from_skb - get header length from data
     *
     * @skb: the frame
     *
     * Given an skb with a raw 802.11 header at the data pointer this function
     * returns the 802.11 header length.
     *
     * Return: The 802.11 header length in bytes (not including encryption
     * headers). Or 0 if the data in the sk_buff is too short to contain a valid
     * 802.11 header.
     */
    unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb);
    
    /**
     * ieee80211_hdrlen - get header length in bytes from frame control
     * @fc: frame control field in little-endian format
     * Return: The header length in bytes.
     */
    unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc);
    
    /**
     * ieee80211_get_mesh_hdrlen - get mesh extension header length
     * @meshhdr: the mesh extension header, only the flags field
     *	(first byte) will be accessed
     * Return: The length of the extension header, which is always at
     * least 6 bytes and at most 18 if address 5 and 6 are present.
     */
    unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr);
    
    /**
     * DOC: Data path helpers
     *
     * In addition to generic utilities, cfg80211 also offers
     * functions that help implement the data path for devices
     * that do not do the 802.11/802.3 conversion on the device.
     */
    
    /**
     * ieee80211_data_to_8023 - convert an 802.11 data frame to 802.3
     * @skb: the 802.11 data frame
     * @addr: the device MAC address
     * @iftype: the virtual interface type
     * Return: 0 on success. Non-zero on error.
     */
    int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
    			   enum nl80211_iftype iftype);
    
    /**
     * ieee80211_data_from_8023 - convert an 802.3 frame to 802.11
     * @skb: the 802.3 frame
     * @addr: the device MAC address
     * @iftype: the virtual interface type
     * @bssid: the network bssid (used only for iftype STATION and ADHOC)
     * @qos: build 802.11 QoS data frame
     * Return: 0 on success, or a negative error code.
     */
    int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
    			     enum nl80211_iftype iftype, const u8 *bssid,
    			     bool qos);
    
    /**
     * ieee80211_amsdu_to_8023s - decode an IEEE 802.11n A-MSDU frame
     *
     * Decode an IEEE 802.11n A-MSDU frame and convert it to a list of
     * 802.3 frames. The @list will be empty if the decode fails. The
     * @skb is consumed after the function returns.
     *
     * @skb: The input IEEE 802.11n A-MSDU frame.
     * @list: The output list of 802.3 frames. It must be allocated and
     *	initialized by by the caller.
     * @addr: The device MAC address.
     * @iftype: The device interface type.
     * @extra_headroom: The hardware extra headroom for SKBs in the @list.
     * @has_80211_header: Set it true if SKB is with IEEE 802.11 header.
     */
    void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
    			      const u8 *addr, enum nl80211_iftype iftype,
    			      const unsigned int extra_headroom,
    			      bool has_80211_header);
    
    /**
     * cfg80211_classify8021d - determine the 802.1p/1d tag for a data frame
     * @skb: the data frame
     * @qos_map: Interworking QoS mapping or %NULL if not in use
     * Return: The 802.1p/1d tag.
     */
    unsigned int cfg80211_classify8021d(struct sk_buff *skb,
    				    struct cfg80211_qos_map *qos_map);
    
    /**
     * cfg80211_find_ie_match - match information element and byte array in data
     *
     * @eid: element ID
     * @ies: data consisting of IEs
     * @len: length of data
     * @match: byte array to match
     * @match_len: number of bytes in the match array
     * @match_offset: offset in the IE where the byte array should match.
     *	If match_len is zero, this must also be set to zero.
     *	Otherwise this must be set to 2 or more, because the first
     *	byte is the element id, which is already compared to eid, and
     *	the second byte is the IE length.
     *
     * Return: %NULL if the element ID could not be found or if
     * the element is invalid (claims to be longer than the given
     * data) or if the byte array doesn't match, or a pointer to the first
     * byte of the requested element, that is the byte containing the
     * element ID.
     *
     * Note: There are no checks on the element length other than
     * having to fit into the given data and being large enough for the
     * byte array to match.
     */
    const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len,
    				 const u8 *match, int match_len,
    				 int match_offset);
    
    /**
     * cfg80211_find_ie - find information element in data
     *
     * @eid: element ID
     * @ies: data consisting of IEs
     * @len: length of data
     *
     * Return: %NULL if the element ID could not be found or if
     * the element is invalid (claims to be longer than the given
     * data), or a pointer to the first byte of the requested
     * element, that is the byte containing the element ID.
     *
     * Note: There are no checks on the element length other than
     * having to fit into the given data.
     */
    static inline const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
    {
    	return cfg80211_find_ie_match(eid, ies, len, NULL, 0, 0);
    }
    
    /**
     * cfg80211_find_vendor_ie - find vendor specific information element in data
     *
     * @oui: vendor OUI
     * @oui_type: vendor-specific OUI type (must be < 0xff), negative means any
     * @ies: data consisting of IEs
     * @len: length of data
     *
     * Return: %NULL if the vendor specific element ID could not be found or if the
     * element is invalid (claims to be longer than the given data), or a pointer to
     * the first byte of the requested element, that is the byte containing the
     * element ID.
     *
     * Note: There are no checks on the element length other than having to fit into
     * the given data.
     */
    const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type,
    				  const u8 *ies, int len);
    
    /**
     * DOC: Regulatory enforcement infrastructure
     *
     * TODO
     */
    
    /**
     * regulatory_hint - driver hint to the wireless core a regulatory domain
     * @wiphy: the wireless device giving the hint (used only for reporting
     *	conflicts)
     * @alpha2: the ISO/IEC 3166 alpha2 the driver claims its regulatory domain
     * 	should be in. If @rd is set this should be NULL. Note that if you
     * 	set this to NULL you should still set rd->alpha2 to some accepted
     * 	alpha2.
     *
     * Wireless drivers can use this function to hint to the wireless core
     * what it believes should be the current regulatory domain by
     * giving it an ISO/IEC 3166 alpha2 country code it knows its regulatory
     * domain should be in or by providing a completely build regulatory domain.
     * If the driver provides an ISO/IEC 3166 alpha2 userspace will be queried
     * for a regulatory domain structure for the respective country.
     *
     * The wiphy must have been registered to cfg80211 prior to this call.
     * For cfg80211 drivers this means you must first use wiphy_register(),
     * for mac80211 drivers you must first use ieee80211_register_hw().
     *
     * Drivers should check the return value, its possible you can get
     * an -ENOMEM.
     *
     * Return: 0 on success. -ENOMEM.
     */
    int regulatory_hint(struct wiphy *wiphy, const char *alpha2);
    
    /**
     * regulatory_set_wiphy_regd - set regdom info for self managed drivers
     * @wiphy: the wireless device we want to process the regulatory domain on
     * @rd: the regulatory domain informatoin to use for this wiphy
     *
     * Set the regulatory domain information for self-managed wiphys, only they
     * may use this function. See %REGULATORY_WIPHY_SELF_MANAGED for more
     * information.
     *
     * Return: 0 on success. -EINVAL, -EPERM
     */
    int regulatory_set_wiphy_regd(struct wiphy *wiphy,
    			      struct ieee80211_regdomain *rd);
    
    /**
     * regulatory_set_wiphy_regd_sync_rtnl - set regdom for self-managed drivers
     * @wiphy: the wireless device we want to process the regulatory domain on
     * @rd: the regulatory domain information to use for this wiphy
     *
     * This functions requires the RTNL to be held and applies the new regdomain
     * synchronously to this wiphy. For more details see
     * regulatory_set_wiphy_regd().
     *
     * Return: 0 on success. -EINVAL, -EPERM
     */
    int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
    					struct ieee80211_regdomain *rd);
    
    /**
     * wiphy_apply_custom_regulatory - apply a custom driver regulatory domain
     * @wiphy: the wireless device we want to process the regulatory domain on
     * @regd: the custom regulatory domain to use for this wiphy
     *
     * Drivers can sometimes have custom regulatory domains which do not apply
     * to a specific country. Drivers can use this to apply such custom regulatory
     * domains. This routine must be called prior to wiphy registration. The
     * custom regulatory domain will be trusted completely and as such previous
     * default channel settings will be disregarded. If no rule is found for a
     * channel on the regulatory domain the channel will be disabled.
     * Drivers using this for a wiphy should also set the wiphy flag
     * REGULATORY_CUSTOM_REG or cfg80211 will set it for the wiphy
     * that called this helper.
     */
    void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
    				   const struct ieee80211_regdomain *regd);
    
    /**
     * freq_reg_info - get regulatory information for the given frequency
     * @wiphy: the wiphy for which we want to process this rule for
     * @center_freq: Frequency in KHz for which we want regulatory information for
     *
     * Use this function to get the regulatory rule for a specific frequency on
     * a given wireless device. If the device has a specific regulatory domain
     * it wants to follow we respect that unless a country IE has been received
     * and processed already.
     *
     * Return: A valid pointer, or, when an error occurs, for example if no rule
     * can be found, the return value is encoded using ERR_PTR(). Use IS_ERR() to
     * check and PTR_ERR() to obtain the numeric return value. The numeric return
     * value will be -ERANGE if we determine the given center_freq does not even
     * have a regulatory rule for a frequency range in the center_freq's band.
     * See freq_in_rule_band() for our current definition of a band -- this is
     * purely subjective and right now it's 802.11 specific.
     */
    const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
    					       u32 center_freq);
    
    /**
     * reg_initiator_name - map regulatory request initiator enum to name
     * @initiator: the regulatory request initiator
     *
     * You can use this to map the regulatory request initiator enum to a
     * proper string representation.
     */
    const char *reg_initiator_name(enum nl80211_reg_initiator initiator);
    
    /*
     * callbacks for asynchronous cfg80211 methods, notification
     * functions and BSS handling helpers
     */
    
    /**
     * cfg80211_scan_done - notify that scan finished
     *
     * @request: the corresponding scan request
     * @info: information about the completed scan
     */
    void cfg80211_scan_done(struct cfg80211_scan_request *request,
    			struct cfg80211_scan_info *info);
    
    /**
     * cfg80211_sched_scan_results - notify that new scan results are available
     *
     * @wiphy: the wiphy which got scheduled scan results
     */
    void cfg80211_sched_scan_results(struct wiphy *wiphy);
    
    /**
     * cfg80211_sched_scan_stopped - notify that the scheduled scan has stopped
     *
     * @wiphy: the wiphy on which the scheduled scan stopped
     *
     * The driver can call this function to inform cfg80211 that the
     * scheduled scan had to be stopped, for whatever reason.  The driver
     * is then called back via the sched_scan_stop operation when done.
     */
    void cfg80211_sched_scan_stopped(struct wiphy *wiphy);
    
    /**
     * cfg80211_sched_scan_stopped_rtnl - notify that the scheduled scan has stopped
     *
     * @wiphy: the wiphy on which the scheduled scan stopped
     *
     * The driver can call this function to inform cfg80211 that the
     * scheduled scan had to be stopped, for whatever reason.  The driver
     * is then called back via the sched_scan_stop operation when done.
     * This function should be called with rtnl locked.
     */
    void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy);
    
    /**
     * cfg80211_inform_bss_frame_data - inform cfg80211 of a received BSS frame
     * @wiphy: the wiphy reporting the BSS
     * @data: the BSS metadata
     * @mgmt: the management frame (probe response or beacon)
     * @len: length of the management frame
     * @gfp: context flags
     *
     * This informs cfg80211 that BSS information was found and
     * the BSS should be updated/added.
     *
     * Return: A referenced struct, must be released with cfg80211_put_bss()!
     * Or %NULL on error.
     */
    struct cfg80211_bss * __must_check
    cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
    			       struct cfg80211_inform_bss *data,
    			       struct ieee80211_mgmt *mgmt, size_t len,
    			       gfp_t gfp);
    
    static inline struct cfg80211_bss * __must_check
    cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
    				struct ieee80211_channel *rx_channel,
    				enum nl80211_bss_scan_width scan_width,
    				struct ieee80211_mgmt *mgmt, size_t len,
    				s32 signal, gfp_t gfp)
    {
    	struct cfg80211_inform_bss data = {
    		.chan = rx_channel,
    		.scan_width = scan_width,
    		.signal = signal,
    	};
    
    	return cfg80211_inform_bss_frame_data(wiphy, &data, mgmt, len, gfp);
    }
    
    static inline struct cfg80211_bss * __must_check
    cfg80211_inform_bss_frame(struct wiphy *wiphy,
    			  struct ieee80211_channel *rx_channel,
    			  struct ieee80211_mgmt *mgmt, size_t len,
    			  s32 signal, gfp_t gfp)
    {
    	struct cfg80211_inform_bss data = {
    		.chan = rx_channel,
    		.scan_width = NL80211_BSS_CHAN_WIDTH_20,
    		.signal = signal,
    	};
    
    	return cfg80211_inform_bss_frame_data(wiphy, &data, mgmt, len, gfp);
    }
    
    /**
     * enum cfg80211_bss_frame_type - frame type that the BSS data came from
     * @CFG80211_BSS_FTYPE_UNKNOWN: driver doesn't know whether the data is
     *	from a beacon or probe response
     * @CFG80211_BSS_FTYPE_BEACON: data comes from a beacon
     * @CFG80211_BSS_FTYPE_PRESP: data comes from a probe response
     */
    enum cfg80211_bss_frame_type {
    	CFG80211_BSS_FTYPE_UNKNOWN,
    	CFG80211_BSS_FTYPE_BEACON,
    	CFG80211_BSS_FTYPE_PRESP,
    };
    
    /**
     * cfg80211_inform_bss_data - inform cfg80211 of a new BSS
     *
     * @wiphy: the wiphy reporting the BSS
     * @data: the BSS metadata
     * @ftype: frame type (if known)
     * @bssid: the BSSID of the BSS
     * @tsf: the TSF sent by the peer in the beacon/probe response (or 0)
     * @capability: the capability field sent by the peer
     * @beacon_interval: the beacon interval announced by the peer
     * @ie: additional IEs sent by the peer
     * @ielen: length of the additional IEs
     * @gfp: context flags
     *
     * This informs cfg80211 that BSS information was found and
     * the BSS should be updated/added.
     *
     * Return: A referenced struct, must be released with cfg80211_put_bss()!
     * Or %NULL on error.
     */
    struct cfg80211_bss * __must_check
    cfg80211_inform_bss_data(struct wiphy *wiphy,
    			 struct cfg80211_inform_bss *data,
    			 enum cfg80211_bss_frame_type ftype,
    			 const u8 *bssid, u64 tsf, u16 capability,
    			 u16 beacon_interval, const u8 *ie, size_t ielen,
    			 gfp_t gfp);
    
    static inline struct cfg80211_bss * __must_check
    cfg80211_inform_bss_width(struct wiphy *wiphy,
    			  struct ieee80211_channel *rx_channel,
    			  enum nl80211_bss_scan_width scan_width,
    			  enum cfg80211_bss_frame_type ftype,
    			  const u8 *bssid, u64 tsf, u16 capability,
    			  u16 beacon_interval, const u8 *ie, size_t ielen,
    			  s32 signal, gfp_t gfp)
    {
    	struct cfg80211_inform_bss data = {
    		.chan = rx_channel,
    		.scan_width = scan_width,
    		.signal = signal,
    	};
    
    	return cfg80211_inform_bss_data(wiphy, &data, ftype, bssid, tsf,
    					capability, beacon_interval, ie, ielen,
    					gfp);
    }
    
    static inline struct cfg80211_bss * __must_check
    cfg80211_inform_bss(struct wiphy *wiphy,
    		    struct ieee80211_channel *rx_channel,
    		    enum cfg80211_bss_frame_type ftype,
    		    const u8 *bssid, u64 tsf, u16 capability,
    		    u16 beacon_interval, const u8 *ie, size_t ielen,
    		    s32 signal, gfp_t gfp)
    {
    	struct cfg80211_inform_bss data = {
    		.chan = rx_channel,
    		.scan_width = NL80211_BSS_CHAN_WIDTH_20,
    		.signal = signal,
    	};
    
    	return cfg80211_inform_bss_data(wiphy, &data, ftype, bssid, tsf,
    					capability, beacon_interval, ie, ielen,
    					gfp);
    }
    
    struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
    				      struct ieee80211_channel *channel,
    				      const u8 *bssid,
    				      const u8 *ssid, size_t ssid_len,
    				      enum ieee80211_bss_type bss_type,
    				      enum ieee80211_privacy);
    static inline struct cfg80211_bss *
    cfg80211_get_ibss(struct wiphy *wiphy,
    		  struct ieee80211_channel *channel,
    		  const u8 *ssid, size_t ssid_len)
    {
    	return cfg80211_get_bss(wiphy, channel, NULL, ssid, ssid_len,
    				IEEE80211_BSS_TYPE_IBSS,
    				IEEE80211_PRIVACY_ANY);
    }
    
    /**
     * cfg80211_ref_bss - reference BSS struct
     * @wiphy: the wiphy this BSS struct belongs to
     * @bss: the BSS struct to reference
     *
     * Increments the refcount of the given BSS struct.
     */
    void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
    
    /**
     * cfg80211_put_bss - unref BSS struct
     * @wiphy: the wiphy this BSS struct belongs to
     * @bss: the BSS struct
     *
     * Decrements the refcount of the given BSS struct.
     */
    void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
    
    /**
     * cfg80211_unlink_bss - unlink BSS from internal data structures
     * @wiphy: the wiphy
     * @bss: the bss to remove
     *
     * This function removes the given BSS from the internal data structures
     * thereby making it no longer show up in scan results etc. Use this
     * function when you detect a BSS is gone. Normally BSSes will also time
     * out, so it is not necessary to use this function at all.
     */
    void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
    
    static inline enum nl80211_bss_scan_width
    cfg80211_chandef_to_scan_width(const struct cfg80211_chan_def *chandef)
    {
    	switch (chandef->width) {
    	case NL80211_CHAN_WIDTH_5:
    		return NL80211_BSS_CHAN_WIDTH_5;
    	case NL80211_CHAN_WIDTH_10:
    		return NL80211_BSS_CHAN_WIDTH_10;
    	default:
    		return NL80211_BSS_CHAN_WIDTH_20;
    	}
    }
    
    /**
     * cfg80211_rx_mlme_mgmt - notification of processed MLME management frame
     * @dev: network device
     * @buf: authentication frame (header + body)
     * @len: length of the frame data
     *
     * This function is called whenever an authentication, disassociation or
     * deauthentication frame has been received and processed in station mode.
     * After being asked to authenticate via cfg80211_ops::auth() the driver must
     * call either this function or cfg80211_auth_timeout().
     * After being asked to associate via cfg80211_ops::assoc() the driver must
     * call either this function or cfg80211_auth_timeout().
     * While connected, the driver must calls this for received and processed
     * disassociation and deauthentication frames. If the frame couldn't be used
     * because it was unprotected, the driver must call the function
     * cfg80211_rx_unprot_mlme_mgmt() instead.
     *
     * This function may sleep. The caller must hold the corresponding wdev's mutex.
     */
    void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len);
    
    /**
     * cfg80211_auth_timeout - notification of timed out authentication
     * @dev: network device
     * @addr: The MAC address of the device with which the authentication timed out
     *
     * This function may sleep. The caller must hold the corresponding wdev's
     * mutex.
     */
    void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr);
    
    /**
     * cfg80211_rx_assoc_resp - notification of processed association response
     * @dev: network device
     * @bss: the BSS that association was requested with, ownership of the pointer
     *	moves to cfg80211 in this call
     * @buf: authentication frame (header + body)
     * @len: length of the frame data
     * @uapsd_queues: bitmap of ACs configured to uapsd. -1 if n/a.
     *
     * After being asked to associate via cfg80211_ops::assoc() the driver must
     * call either this function or cfg80211_auth_timeout().
     *
     * This function may sleep. The caller must hold the corresponding wdev's mutex.
     */
    void cfg80211_rx_assoc_resp(struct net_device *dev,
    			    struct cfg80211_bss *bss,
    			    const u8 *buf, size_t len,
    			    int uapsd_queues);
    
    /**
     * cfg80211_assoc_timeout - notification of timed out association
     * @dev: network device
     * @bss: The BSS entry with which association timed out.
     *
     * This function may sleep. The caller must hold the corresponding wdev's mutex.
     */
    void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss);
    
    /**
     * cfg80211_tx_mlme_mgmt - notification of transmitted deauth/disassoc frame
     * @dev: network device
     * @buf: 802.11 frame (header + body)
     * @len: length of the frame data
     *
     * This function is called whenever deauthentication has been processed in
     * station mode. This includes both received deauthentication frames and
     * locally generated ones. This function may sleep. The caller must hold the
     * corresponding wdev's mutex.
     */
    void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len);
    
    /**
     * cfg80211_rx_unprot_mlme_mgmt - notification of unprotected mlme mgmt frame
     * @dev: network device
     * @buf: deauthentication frame (header + body)
     * @len: length of the frame data
     *
     * This function is called whenever a received deauthentication or dissassoc
     * frame has been dropped in station mode because of MFP being used but the
     * frame was not protected. This function may sleep.
     */
    void cfg80211_rx_unprot_mlme_mgmt(struct net_device *dev,
    				  const u8 *buf, size_t len);
    
    /**
     * cfg80211_michael_mic_failure - notification of Michael MIC failure (TKIP)
     * @dev: network device
     * @addr: The source MAC address of the frame
     * @key_type: The key type that the received frame used
     * @key_id: Key identifier (0..3). Can be -1 if missing.
     * @tsc: The TSC value of the frame that generated the MIC failure (6 octets)
     * @gfp: allocation flags
     *
     * This function is called whenever the local MAC detects a MIC failure in a
     * received frame. This matches with MLME-MICHAELMICFAILURE.indication()
     * primitive.
     */
    void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
    				  enum nl80211_key_type key_type, int key_id,
    				  const u8 *tsc, gfp_t gfp);
    
    /**
     * cfg80211_ibss_joined - notify cfg80211 that device joined an IBSS
     *
     * @dev: network device
     * @bssid: the BSSID of the IBSS joined
     * @channel: the channel of the IBSS joined
     * @gfp: allocation flags
     *
     * This function notifies cfg80211 that the device joined an IBSS or
     * switched to a different BSSID. Before this function can be called,
     * either a beacon has to have been received from the IBSS, or one of
     * the cfg80211_inform_bss{,_frame} functions must have been called
     * with the locally generated beacon -- this guarantees that there is
     * always a scan result for this IBSS. cfg80211 will handle the rest.
     */
    void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
    			  struct ieee80211_channel *channel, gfp_t gfp);
    
    /**
     * cfg80211_notify_new_candidate - notify cfg80211 of a new mesh peer candidate
     *
     * @dev: network device
     * @macaddr: the MAC address of the new candidate
     * @ie: information elements advertised by the peer candidate
     * @ie_len: lenght of the information elements buffer
     * @gfp: allocation flags
     *
     * This function notifies cfg80211 that the mesh peer candidate has been
     * detected, most likely via a beacon or, less likely, via a probe response.
     * cfg80211 then sends a notification to userspace.
     */
    void cfg80211_notify_new_peer_candidate(struct net_device *dev,
    		const u8 *macaddr, const u8 *ie, u8 ie_len, gfp_t gfp);
    
    /**
     * DOC: RFkill integration
     *
     * RFkill integration in cfg80211 is almost invisible to drivers,
     * as cfg80211 automatically registers an rfkill instance for each
     * wireless device it knows about. Soft kill is also translated
     * into disconnecting and turning all interfaces off, drivers are
     * expected to turn off the device when all interfaces are down.
     *
     * However, devices may have a hard RFkill line, in which case they
     * also need to interact with the rfkill subsystem, via cfg80211.
     * They can do this with a few helper functions documented here.
     */
    
    /**
     * wiphy_rfkill_set_hw_state - notify cfg80211 about hw block state
     * @wiphy: the wiphy
     * @blocked: block status
     */
    void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked);
    
    /**
     * wiphy_rfkill_start_polling - start polling rfkill
     * @wiphy: the wiphy
     */
    void wiphy_rfkill_start_polling(struct wiphy *wiphy);
    
    /**
     * wiphy_rfkill_stop_polling - stop polling rfkill
     * @wiphy: the wiphy
     */
    void wiphy_rfkill_stop_polling(struct wiphy *wiphy);
    
    /**
     * DOC: Vendor commands
     *
     * Occasionally, there are special protocol or firmware features that
     * can't be implemented very openly. For this and similar cases, the
     * vendor command functionality allows implementing the features with
     * (typically closed-source) userspace and firmware, using nl80211 as
     * the configuration mechanism.
     *
     * A driver supporting vendor commands must register them as an array
     * in struct wiphy, with handlers for each one, each command has an
     * OUI and sub command ID to identify it.
     *
     * Note that this feature should not be (ab)used to implement protocol
     * features that could openly be shared across drivers. In particular,
     * it must never be required to use vendor commands to implement any
     * "normal" functionality that higher-level userspace like connection
     * managers etc. need.
     */
    
    struct sk_buff *__cfg80211_alloc_reply_skb(struct wiphy *wiphy,
    					   enum nl80211_commands cmd,
    					   enum nl80211_attrs attr,
    					   int approxlen);
    
    struct sk_buff *__cfg80211_alloc_event_skb(struct wiphy *wiphy,
    					   struct wireless_dev *wdev,
    					   enum nl80211_commands cmd,
    					   enum nl80211_attrs attr,
    					   int vendor_event_idx,
    					   int approxlen, gfp_t gfp);
    
    void __cfg80211_send_event_skb(struct sk_buff *skb, gfp_t gfp);
    
    /**
     * cfg80211_vendor_cmd_alloc_reply_skb - allocate vendor command reply
     * @wiphy: the wiphy
     * @approxlen: an upper bound of the length of the data that will
     *	be put into the skb
     *
     * This function allocates and pre-fills an skb for a reply to
     * a vendor command. Since it is intended for a reply, calling
     * it outside of a vendor command's doit() operation is invalid.
     *
     * The returned skb is pre-filled with some identifying data in
     * a way that any data that is put into the skb (with skb_put(),
     * nla_put() or similar) will end up being within the
     * %NL80211_ATTR_VENDOR_DATA attribute, so all that needs to be done
     * with the skb is adding data for the corresponding userspace tool
     * which can then read that data out of the vendor data attribute.
     * You must not modify the skb in any other way.
     *
     * When done, call cfg80211_vendor_cmd_reply() with the skb and return
     * its error code as the result of the doit() operation.
     *
     * Return: An allocated and pre-filled skb. %NULL if any errors happen.
     */
    static inline struct sk_buff *
    cfg80211_vendor_cmd_alloc_reply_skb(struct wiphy *wiphy, int approxlen)
    {
    	return __cfg80211_alloc_reply_skb(wiphy, NL80211_CMD_VENDOR,
    					  NL80211_ATTR_VENDOR_DATA, approxlen);
    }
    
    /**
     * cfg80211_vendor_cmd_reply - send the reply skb
     * @skb: The skb, must have been allocated with
     *	cfg80211_vendor_cmd_alloc_reply_skb()
     *
     * Since calling this function will usually be the last thing
     * before returning from the vendor command doit() you should
     * return the error code.  Note that this function consumes the
     * skb regardless of the return value.
     *
     * Return: An error code or 0 on success.
     */
    int cfg80211_vendor_cmd_reply(struct sk_buff *skb);
    
    /**
     * cfg80211_vendor_event_alloc - allocate vendor-specific event skb
     * @wiphy: the wiphy
     * @wdev: the wireless device
     * @event_idx: index of the vendor event in the wiphy's vendor_events
     * @approxlen: an upper bound of the length of the data that will
     *	be put into the skb
     * @gfp: allocation flags
     *
     * This function allocates and pre-fills an skb for an event on the
     * vendor-specific multicast group.
     *
     * If wdev != NULL, both the ifindex and identifier of the specified
     * wireless device are added to the event message before the vendor data
     * attribute.
     *
     * When done filling the skb, call cfg80211_vendor_event() with the
     * skb to send the event.
     *
     * Return: An allocated and pre-filled skb. %NULL if any errors happen.
     */
    static inline struct sk_buff *
    cfg80211_vendor_event_alloc(struct wiphy *wiphy, struct wireless_dev *wdev,
    			     int approxlen, int event_idx, gfp_t gfp)
    {
    	return __cfg80211_alloc_event_skb(wiphy, wdev, NL80211_CMD_VENDOR,
    					  NL80211_ATTR_VENDOR_DATA,
    					  event_idx, approxlen, gfp);
    }
    
    /**
     * cfg80211_vendor_event - send the event
     * @skb: The skb, must have been allocated with cfg80211_vendor_event_alloc()
     * @gfp: allocation flags
     *
     * This function sends the given @skb, which must have been allocated
     * by cfg80211_vendor_event_alloc(), as an event. It always consumes it.
     */
    static inline void cfg80211_vendor_event(struct sk_buff *skb, gfp_t gfp)
    {
    	__cfg80211_send_event_skb(skb, gfp);
    }
    
    #ifdef CONFIG_NL80211_TESTMODE
    /**
     * DOC: Test mode
     *
     * Test mode is a set of utility functions to allow drivers to
     * interact with driver-specific tools to aid, for instance,
     * factory programming.
     *
     * This chapter describes how drivers interact with it, for more
     * information see the nl80211 book's chapter on it.
     */
    
    /**
     * cfg80211_testmode_alloc_reply_skb - allocate testmode reply
     * @wiphy: the wiphy
     * @approxlen: an upper bound of the length of the data that will
     *	be put into the skb
     *
     * This function allocates and pre-fills an skb for a reply to
     * the testmode command. Since it is intended for a reply, calling
     * it outside of the @testmode_cmd operation is invalid.
     *
     * The returned skb is pre-filled with the wiphy index and set up in
     * a way that any data that is put into the skb (with skb_put(),
     * nla_put() or similar) will end up being within the
     * %NL80211_ATTR_TESTDATA attribute, so all that needs to be done
     * with the skb is adding data for the corresponding userspace tool
     * which can then read that data out of the testdata attribute. You
     * must not modify the skb in any other way.
     *
     * When done, call cfg80211_testmode_reply() with the skb and return
     * its error code as the result of the @testmode_cmd operation.
     *
     * Return: An allocated and pre-filled skb. %NULL if any errors happen.
     */
    static inline struct sk_buff *
    cfg80211_testmode_alloc_reply_skb(struct wiphy *wiphy, int approxlen)
    {
    	return __cfg80211_alloc_reply_skb(wiphy, NL80211_CMD_TESTMODE,
    					  NL80211_ATTR_TESTDATA, approxlen);
    }
    
    /**
     * cfg80211_testmode_reply - send the reply skb
     * @skb: The skb, must have been allocated with
     *	cfg80211_testmode_alloc_reply_skb()
     *
     * Since calling this function will usually be the last thing
     * before returning from the @testmode_cmd you should return
     * the error code.  Note that this function consumes the skb
     * regardless of the return value.
     *
     * Return: An error code or 0 on success.
     */
    static inline int cfg80211_testmode_reply(struct sk_buff *skb)
    {
    	return cfg80211_vendor_cmd_reply(skb);
    }
    
    /**
     * cfg80211_testmode_alloc_event_skb - allocate testmode event
     * @wiphy: the wiphy
     * @approxlen: an upper bound of the length of the data that will
     *	be put into the skb
     * @gfp: allocation flags
     *
     * This function allocates and pre-fills an skb for an event on the
     * testmode multicast group.
     *
     * The returned skb is set up in the same way as with
     * cfg80211_testmode_alloc_reply_skb() but prepared for an event. As
     * there, you should simply add data to it that will then end up in the
     * %NL80211_ATTR_TESTDATA attribute. Again, you must not modify the skb
     * in any other way.
     *
     * When done filling the skb, call cfg80211_testmode_event() with the
     * skb to send the event.
     *
     * Return: An allocated and pre-filled skb. %NULL if any errors happen.
     */
    static inline struct sk_buff *
    cfg80211_testmode_alloc_event_skb(struct wiphy *wiphy, int approxlen, gfp_t gfp)
    {
    	return __cfg80211_alloc_event_skb(wiphy, NULL, NL80211_CMD_TESTMODE,
    					  NL80211_ATTR_TESTDATA, -1,
    					  approxlen, gfp);
    }
    
    /**
     * cfg80211_testmode_event - send the event
     * @skb: The skb, must have been allocated with
     *	cfg80211_testmode_alloc_event_skb()
     * @gfp: allocation flags
     *
     * This function sends the given @skb, which must have been allocated
     * by cfg80211_testmode_alloc_event_skb(), as an event. It always
     * consumes it.
     */
    static inline void cfg80211_testmode_event(struct sk_buff *skb, gfp_t gfp)
    {
    	__cfg80211_send_event_skb(skb, gfp);
    }
    
    #define CFG80211_TESTMODE_CMD(cmd)	.testmode_cmd = (cmd),
    #define CFG80211_TESTMODE_DUMP(cmd)	.testmode_dump = (cmd),
    #else
    #define CFG80211_TESTMODE_CMD(cmd)
    #define CFG80211_TESTMODE_DUMP(cmd)
    #endif
    
    /**
     * cfg80211_connect_bss - notify cfg80211 of connection result
     *
     * @dev: network device
     * @bssid: the BSSID of the AP
     * @bss: entry of bss to which STA got connected to, can be obtained
     *	through cfg80211_get_bss (may be %NULL)
     * @req_ie: association request IEs (maybe be %NULL)
     * @req_ie_len: association request IEs length
     * @resp_ie: association response IEs (may be %NULL)
     * @resp_ie_len: assoc response IEs length
     * @status: status code, 0 for successful connection, use
     *      %WLAN_STATUS_UNSPECIFIED_FAILURE if your device cannot give you
     *      the real status code for failures.
     * @gfp: allocation flags
     *
     * It should be called by the underlying driver whenever connect() has
     * succeeded. This is similar to cfg80211_connect_result(), but with the
     * option of identifying the exact bss entry for the connection. Only one of
     * these functions should be called.
     */
    void cfg80211_connect_bss(struct net_device *dev, const u8 *bssid,
    			  struct cfg80211_bss *bss, const u8 *req_ie,
    			  size_t req_ie_len, const u8 *resp_ie,
    			  size_t resp_ie_len, int status, gfp_t gfp);
    
    /**
     * cfg80211_connect_result - notify cfg80211 of connection result
     *
     * @dev: network device
     * @bssid: the BSSID of the AP
     * @req_ie: association request IEs (maybe be %NULL)
     * @req_ie_len: association request IEs length
     * @resp_ie: association response IEs (may be %NULL)
     * @resp_ie_len: assoc response IEs length
     * @status: status code, 0 for successful connection, use
     *	%WLAN_STATUS_UNSPECIFIED_FAILURE if your device cannot give you
     *	the real status code for failures.
     * @gfp: allocation flags
     *
     * It should be called by the underlying driver whenever connect() has
     * succeeded.
     */
    static inline void
    cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
    			const u8 *req_ie, size_t req_ie_len,
    			const u8 *resp_ie, size_t resp_ie_len,
    			u16 status, gfp_t gfp)
    {
    	cfg80211_connect_bss(dev, bssid, NULL, req_ie, req_ie_len, resp_ie,
    			     resp_ie_len, status, gfp);
    }
    
    /**
     * cfg80211_connect_timeout - notify cfg80211 of connection timeout
     *
     * @dev: network device
     * @bssid: the BSSID of the AP
     * @req_ie: association request IEs (maybe be %NULL)
     * @req_ie_len: association request IEs length
     * @gfp: allocation flags
     *
     * It should be called by the underlying driver whenever connect() has failed
     * in a sequence where no explicit authentication/association rejection was
     * received from the AP. This could happen, e.g., due to not being able to send
     * out the Authentication or Association Request frame or timing out while
     * waiting for the response.
     */
    static inline void
    cfg80211_connect_timeout(struct net_device *dev, const u8 *bssid,
    			 const u8 *req_ie, size_t req_ie_len, gfp_t gfp)
    {
    	cfg80211_connect_bss(dev, bssid, NULL, req_ie, req_ie_len, NULL, 0, -1,
    			     gfp);
    }
    
    /**
     * cfg80211_roamed - notify cfg80211 of roaming
     *
     * @dev: network device
     * @channel: the channel of the new AP
     * @bssid: the BSSID of the new AP
     * @req_ie: association request IEs (maybe be %NULL)
     * @req_ie_len: association request IEs length
     * @resp_ie: association response IEs (may be %NULL)
     * @resp_ie_len: assoc response IEs length
     * @gfp: allocation flags
     *
     * It should be called by the underlying driver whenever it roamed
     * from one AP to another while connected.
     */
    void cfg80211_roamed(struct net_device *dev,
    		     struct ieee80211_channel *channel,
    		     const u8 *bssid,
    		     const u8 *req_ie, size_t req_ie_len,
    		     const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp);
    
    /**
     * cfg80211_roamed_bss - notify cfg80211 of roaming
     *
     * @dev: network device
     * @bss: entry of bss to which STA got roamed
     * @req_ie: association request IEs (maybe be %NULL)
     * @req_ie_len: association request IEs length
     * @resp_ie: association response IEs (may be %NULL)
     * @resp_ie_len: assoc response IEs length
     * @gfp: allocation flags
     *
     * This is just a wrapper to notify cfg80211 of roaming event with driver
     * passing bss to avoid a race in timeout of the bss entry. It should be
     * called by the underlying driver whenever it roamed from one AP to another
     * while connected. Drivers which have roaming implemented in firmware
     * may use this function to avoid a race in bss entry timeout where the bss
     * entry of the new AP is seen in the driver, but gets timed out by the time
     * it is accessed in __cfg80211_roamed() due to delay in scheduling
     * rdev->event_work. In case of any failures, the reference is released
     * either in cfg80211_roamed_bss() or in __cfg80211_romed(), Otherwise,
     * it will be released while diconneting from the current bss.
     */
    void cfg80211_roamed_bss(struct net_device *dev, struct cfg80211_bss *bss,
    			 const u8 *req_ie, size_t req_ie_len,
    			 const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp);
    
    /**
     * cfg80211_disconnected - notify cfg80211 that connection was dropped
     *
     * @dev: network device
     * @ie: information elements of the deauth/disassoc frame (may be %NULL)
     * @ie_len: length of IEs
     * @reason: reason code for the disconnection, set it to 0 if unknown
     * @locally_generated: disconnection was requested locally
     * @gfp: allocation flags
     *
     * After it calls this function, the driver should enter an idle state
     * and not try to connect to any AP any more.
     */
    void cfg80211_disconnected(struct net_device *dev, u16 reason,
    			   const u8 *ie, size_t ie_len,
    			   bool locally_generated, gfp_t gfp);
    
    /**
     * cfg80211_ready_on_channel - notification of remain_on_channel start
     * @wdev: wireless device
     * @cookie: the request cookie
     * @chan: The current channel (from remain_on_channel request)
     * @duration: Duration in milliseconds that the driver intents to remain on the
     *	channel
     * @gfp: allocation flags
     */
    void cfg80211_ready_on_channel(struct wireless_dev *wdev, u64 cookie,
    			       struct ieee80211_channel *chan,
    			       unsigned int duration, gfp_t gfp);
    
    /**
     * cfg80211_remain_on_channel_expired - remain_on_channel duration expired
     * @wdev: wireless device
     * @cookie: the request cookie
     * @chan: The current channel (from remain_on_channel request)
     * @gfp: allocation flags
     */
    void cfg80211_remain_on_channel_expired(struct wireless_dev *wdev, u64 cookie,
    					struct ieee80211_channel *chan,
    					gfp_t gfp);
    
    
    /**
     * cfg80211_new_sta - notify userspace about station
     *
     * @dev: the netdev
     * @mac_addr: the station's address
     * @sinfo: the station information
     * @gfp: allocation flags
     */
    void cfg80211_new_sta(struct net_device *dev, const u8 *mac_addr,
    		      struct station_info *sinfo, gfp_t gfp);
    
    /**
     * cfg80211_del_sta_sinfo - notify userspace about deletion of a station
     * @dev: the netdev
     * @mac_addr: the station's address
     * @sinfo: the station information/statistics
     * @gfp: allocation flags
     */
    void cfg80211_del_sta_sinfo(struct net_device *dev, const u8 *mac_addr,
    			    struct station_info *sinfo, gfp_t gfp);
    
    /**
     * cfg80211_del_sta - notify userspace about deletion of a station
     *
     * @dev: the netdev
     * @mac_addr: the station's address
     * @gfp: allocation flags
     */
    static inline void cfg80211_del_sta(struct net_device *dev,
    				    const u8 *mac_addr, gfp_t gfp)
    {
    	cfg80211_del_sta_sinfo(dev, mac_addr, NULL, gfp);
    }
    
    /**
     * cfg80211_conn_failed - connection request failed notification
     *
     * @dev: the netdev
     * @mac_addr: the station's address
     * @reason: the reason for connection failure
     * @gfp: allocation flags
     *
     * Whenever a station tries to connect to an AP and if the station
     * could not connect to the AP as the AP has rejected the connection
     * for some reasons, this function is called.
     *
     * The reason for connection failure can be any of the value from
     * nl80211_connect_failed_reason enum
     */
    void cfg80211_conn_failed(struct net_device *dev, const u8 *mac_addr,
    			  enum nl80211_connect_failed_reason reason,
    			  gfp_t gfp);
    
    /**
     * cfg80211_rx_mgmt - notification of received, unprocessed management frame
     * @wdev: wireless device receiving the frame
     * @freq: Frequency on which the frame was received in MHz
     * @sig_dbm: signal strength in mBm, or 0 if unknown
     * @buf: Management frame (header + body)
     * @len: length of the frame data
     * @flags: flags, as defined in enum nl80211_rxmgmt_flags
     *
     * This function is called whenever an Action frame is received for a station
     * mode interface, but is not processed in kernel.
     *
     * Return: %true if a user space application has registered for this frame.
     * For action frames, that makes it responsible for rejecting unrecognized
     * action frames; %false otherwise, in which case for action frames the
     * driver is responsible for rejecting the frame.
     */
    bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_dbm,
    		      const u8 *buf, size_t len, u32 flags);
    
    /**
     * cfg80211_mgmt_tx_status - notification of TX status for management frame
     * @wdev: wireless device receiving the frame
     * @cookie: Cookie returned by cfg80211_ops::mgmt_tx()
     * @buf: Management frame (header + body)
     * @len: length of the frame data
     * @ack: Whether frame was acknowledged
     * @gfp: context flags
     *
     * This function is called whenever a management frame was requested to be
     * transmitted with cfg80211_ops::mgmt_tx() to report the TX status of the
     * transmission attempt.
     */
    void cfg80211_mgmt_tx_status(struct wireless_dev *wdev, u64 cookie,
    			     const u8 *buf, size_t len, bool ack, gfp_t gfp);
    
    
    /**
     * cfg80211_cqm_rssi_notify - connection quality monitoring rssi event
     * @dev: network device
     * @rssi_event: the triggered RSSI event
     * @gfp: context flags
     *
     * This function is called when a configured connection quality monitoring
     * rssi threshold reached event occurs.
     */
    void cfg80211_cqm_rssi_notify(struct net_device *dev,
    			      enum nl80211_cqm_rssi_threshold_event rssi_event,
    			      gfp_t gfp);
    
    /**
     * cfg80211_cqm_pktloss_notify - notify userspace about packetloss to peer
     * @dev: network device
     * @peer: peer's MAC address
     * @num_packets: how many packets were lost -- should be a fixed threshold
     *	but probably no less than maybe 50, or maybe a throughput dependent
     *	threshold (to account for temporary interference)
     * @gfp: context flags
     */
    void cfg80211_cqm_pktloss_notify(struct net_device *dev,
    				 const u8 *peer, u32 num_packets, gfp_t gfp);
    
    /**
     * cfg80211_cqm_txe_notify - TX error rate event
     * @dev: network device
     * @peer: peer's MAC address
     * @num_packets: how many packets were lost
     * @rate: % of packets which failed transmission
     * @intvl: interval (in s) over which the TX failure threshold was breached.
     * @gfp: context flags
     *
     * Notify userspace when configured % TX failures over number of packets in a
     * given interval is exceeded.
     */
    void cfg80211_cqm_txe_notify(struct net_device *dev, const u8 *peer,
    			     u32 num_packets, u32 rate, u32 intvl, gfp_t gfp);
    
    /**
     * cfg80211_cqm_beacon_loss_notify - beacon loss event
     * @dev: network device
     * @gfp: context flags
     *
     * Notify userspace about beacon loss from the connected AP.
     */
    void cfg80211_cqm_beacon_loss_notify(struct net_device *dev, gfp_t gfp);
    
    /**
     * cfg80211_radar_event - radar detection event
     * @wiphy: the wiphy
     * @chandef: chandef for the current channel
     * @gfp: context flags
     *
     * This function is called when a radar is detected on the current chanenl.
     */
    void cfg80211_radar_event(struct wiphy *wiphy,
    			  struct cfg80211_chan_def *chandef, gfp_t gfp);
    
    /**
     * cfg80211_cac_event - Channel availability check (CAC) event
     * @netdev: network device
     * @chandef: chandef for the current channel
     * @event: type of event
     * @gfp: context flags
     *
     * This function is called when a Channel availability check (CAC) is finished
     * or aborted. This must be called to notify the completion of a CAC process,
     * also by full-MAC drivers.
     */
    void cfg80211_cac_event(struct net_device *netdev,
    			const struct cfg80211_chan_def *chandef,
    			enum nl80211_radar_event event, gfp_t gfp);
    
    
    /**
     * cfg80211_gtk_rekey_notify - notify userspace about driver rekeying
     * @dev: network device
     * @bssid: BSSID of AP (to avoid races)
     * @replay_ctr: new replay counter
     * @gfp: allocation flags
     */
    void cfg80211_gtk_rekey_notify(struct net_device *dev, const u8 *bssid,
    			       const u8 *replay_ctr, gfp_t gfp);
    
    /**
     * cfg80211_pmksa_candidate_notify - notify about PMKSA caching candidate
     * @dev: network device
     * @index: candidate index (the smaller the index, the higher the priority)
     * @bssid: BSSID of AP
     * @preauth: Whether AP advertises support for RSN pre-authentication
     * @gfp: allocation flags
     */
    void cfg80211_pmksa_candidate_notify(struct net_device *dev, int index,
    				     const u8 *bssid, bool preauth, gfp_t gfp);
    
    /**
     * cfg80211_rx_spurious_frame - inform userspace about a spurious frame
     * @dev: The device the frame matched to
     * @addr: the transmitter address
     * @gfp: context flags
     *
     * This function is used in AP mode (only!) to inform userspace that
     * a spurious class 3 frame was received, to be able to deauth the
     * sender.
     * Return: %true if the frame was passed to userspace (or this failed
     * for a reason other than not having a subscription.)
     */
    bool cfg80211_rx_spurious_frame(struct net_device *dev,
    				const u8 *addr, gfp_t gfp);
    
    /**
     * cfg80211_rx_unexpected_4addr_frame - inform about unexpected WDS frame
     * @dev: The device the frame matched to
     * @addr: the transmitter address
     * @gfp: context flags
     *
     * This function is used in AP mode (only!) to inform userspace that
     * an associated station sent a 4addr frame but that wasn't expected.
     * It is allowed and desirable to send this event only once for each
     * station to avoid event flooding.
     * Return: %true if the frame was passed to userspace (or this failed
     * for a reason other than not having a subscription.)
     */
    bool cfg80211_rx_unexpected_4addr_frame(struct net_device *dev,
    					const u8 *addr, gfp_t gfp);
    
    /**
     * cfg80211_probe_status - notify userspace about probe status
     * @dev: the device the probe was sent on
     * @addr: the address of the peer
     * @cookie: the cookie filled in @probe_client previously
     * @acked: indicates whether probe was acked or not
     * @gfp: allocation flags
     */
    void cfg80211_probe_status(struct net_device *dev, const u8 *addr,
    			   u64 cookie, bool acked, gfp_t gfp);
    
    /**
     * cfg80211_report_obss_beacon - report beacon from other APs
     * @wiphy: The wiphy that received the beacon
     * @frame: the frame
     * @len: length of the frame
     * @freq: frequency the frame was received on
     * @sig_dbm: signal strength in mBm, or 0 if unknown
     *
     * Use this function to report to userspace when a beacon was
     * received. It is not useful to call this when there is no
     * netdev that is in AP/GO mode.
     */
    void cfg80211_report_obss_beacon(struct wiphy *wiphy,
    				 const u8 *frame, size_t len,
    				 int freq, int sig_dbm);
    
    /**
     * cfg80211_reg_can_beacon - check if beaconing is allowed
     * @wiphy: the wiphy
     * @chandef: the channel definition
     * @iftype: interface type
     *
     * Return: %true if there is no secondary channel or the secondary channel(s)
     * can be used for beaconing (i.e. is not a radar channel etc.)
     */
    bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
    			     struct cfg80211_chan_def *chandef,
    			     enum nl80211_iftype iftype);
    
    /**
     * cfg80211_reg_can_beacon_relax - check if beaconing is allowed with relaxation
     * @wiphy: the wiphy
     * @chandef: the channel definition
     * @iftype: interface type
     *
     * Return: %true if there is no secondary channel or the secondary channel(s)
     * can be used for beaconing (i.e. is not a radar channel etc.). This version
     * also checks if IR-relaxation conditions apply, to allow beaconing under
     * more permissive conditions.
     *
     * Requires the RTNL to be held.
     */
    bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
    				   struct cfg80211_chan_def *chandef,
    				   enum nl80211_iftype iftype);
    
    /*
     * cfg80211_ch_switch_notify - update wdev channel and notify userspace
     * @dev: the device which switched channels
     * @chandef: the new channel definition
     *
     * Caller must acquire wdev_lock, therefore must only be called from sleepable
     * driver context!
     */
    void cfg80211_ch_switch_notify(struct net_device *dev,
    			       struct cfg80211_chan_def *chandef);
    
    /*
     * cfg80211_ch_switch_started_notify - notify channel switch start
     * @dev: the device on which the channel switch started
     * @chandef: the future channel definition
     * @count: the number of TBTTs until the channel switch happens
     *
     * Inform the userspace about the channel switch that has just
     * started, so that it can take appropriate actions (eg. starting
     * channel switch on other vifs), if necessary.
     */
    void cfg80211_ch_switch_started_notify(struct net_device *dev,
    				       struct cfg80211_chan_def *chandef,
    				       u8 count);
    
    /**
     * ieee80211_operating_class_to_band - convert operating class to band
     *
     * @operating_class: the operating class to convert
     * @band: band pointer to fill
     *
     * Returns %true if the conversion was successful, %false otherwise.
     */
    bool ieee80211_operating_class_to_band(u8 operating_class,
    				       enum nl80211_band *band);
    
    /**
     * ieee80211_chandef_to_operating_class - convert chandef to operation class
     *
     * @chandef: the chandef to convert
     * @op_class: a pointer to the resulting operating class
     *
     * Returns %true if the conversion was successful, %false otherwise.
     */
    bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
    					  u8 *op_class);
    
    /*
     * cfg80211_tdls_oper_request - request userspace to perform TDLS operation
     * @dev: the device on which the operation is requested
     * @peer: the MAC address of the peer device
     * @oper: the requested TDLS operation (NL80211_TDLS_SETUP or
     *	NL80211_TDLS_TEARDOWN)
     * @reason_code: the reason code for teardown request
     * @gfp: allocation flags
     *
     * This function is used to request userspace to perform TDLS operation that
     * requires knowledge of keys, i.e., link setup or teardown when the AP
     * connection uses encryption. This is optional mechanism for the driver to use
     * if it can automatically determine when a TDLS link could be useful (e.g.,
     * based on traffic and signal strength for a peer).
     */
    void cfg80211_tdls_oper_request(struct net_device *dev, const u8 *peer,
    				enum nl80211_tdls_operation oper,
    				u16 reason_code, gfp_t gfp);
    
    /*
     * cfg80211_calculate_bitrate - calculate actual bitrate (in 100Kbps units)
     * @rate: given rate_info to calculate bitrate from
     *
     * return 0 if MCS index >= 32
     */
    u32 cfg80211_calculate_bitrate(struct rate_info *rate);
    
    /**
     * cfg80211_unregister_wdev - remove the given wdev
     * @wdev: struct wireless_dev to remove
     *
     * Call this function only for wdevs that have no netdev assigned,
     * e.g. P2P Devices. It removes the device from the list so that
     * it can no longer be used. It is necessary to call this function
     * even when cfg80211 requests the removal of the interface by
     * calling the del_virtual_intf() callback. The function must also
     * be called when the driver wishes to unregister the wdev, e.g.
     * when the device is unbound from the driver.
     *
     * Requires the RTNL to be held.
     */
    void cfg80211_unregister_wdev(struct wireless_dev *wdev);
    
    /**
     * struct cfg80211_ft_event - FT Information Elements
     * @ies: FT IEs
     * @ies_len: length of the FT IE in bytes
     * @target_ap: target AP's MAC address
     * @ric_ies: RIC IE
     * @ric_ies_len: length of the RIC IE in bytes
     */
    struct cfg80211_ft_event_params {
    	const u8 *ies;
    	size_t ies_len;
    	const u8 *target_ap;
    	const u8 *ric_ies;
    	size_t ric_ies_len;
    };
    
    /**
     * cfg80211_ft_event - notify userspace about FT IE and RIC IE
     * @netdev: network device
     * @ft_event: IE information
     */
    void cfg80211_ft_event(struct net_device *netdev,
    		       struct cfg80211_ft_event_params *ft_event);
    
    /**
     * cfg80211_get_p2p_attr - find and copy a P2P attribute from IE buffer
     * @ies: the input IE buffer
     * @len: the input length
     * @attr: the attribute ID to find
     * @buf: output buffer, can be %NULL if the data isn't needed, e.g.
     *	if the function is only called to get the needed buffer size
     * @bufsize: size of the output buffer
     *
     * The function finds a given P2P attribute in the (vendor) IEs and
     * copies its contents to the given buffer.
     *
     * Return: A negative error code (-%EILSEQ or -%ENOENT) if the data is
     * malformed or the attribute can't be found (respectively), or the
     * length of the found attribute (which can be zero).
     */
    int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
    			  enum ieee80211_p2p_attr_id attr,
    			  u8 *buf, unsigned int bufsize);
    
    /**
     * ieee80211_ie_split_ric - split an IE buffer according to ordering (with RIC)
     * @ies: the IE buffer
     * @ielen: the length of the IE buffer
     * @ids: an array with element IDs that are allowed before
     *	the split
     * @n_ids: the size of the element ID array
     * @after_ric: array IE types that come after the RIC element
     * @n_after_ric: size of the @after_ric array
     * @offset: offset where to start splitting in the buffer
     *
     * This function splits an IE buffer by updating the @offset
     * variable to point to the location where the buffer should be
     * split.
     *
     * It assumes that the given IE buffer is well-formed, this
     * has to be guaranteed by the caller!
     *
     * It also assumes that the IEs in the buffer are ordered
     * correctly, if not the result of using this function will not
     * be ordered correctly either, i.e. it does no reordering.
     *
     * The function returns the offset where the next part of the
     * buffer starts, which may be @ielen if the entire (remainder)
     * of the buffer should be used.
     */
    size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
    			      const u8 *ids, int n_ids,
    			      const u8 *after_ric, int n_after_ric,
    			      size_t offset);
    
    /**
     * ieee80211_ie_split - split an IE buffer according to ordering
     * @ies: the IE buffer
     * @ielen: the length of the IE buffer
     * @ids: an array with element IDs that are allowed before
     *	the split
     * @n_ids: the size of the element ID array
     * @offset: offset where to start splitting in the buffer
     *
     * This function splits an IE buffer by updating the @offset
     * variable to point to the location where the buffer should be
     * split.
     *
     * It assumes that the given IE buffer is well-formed, this
     * has to be guaranteed by the caller!
     *
     * It also assumes that the IEs in the buffer are ordered
     * correctly, if not the result of using this function will not
     * be ordered correctly either, i.e. it does no reordering.
     *
     * The function returns the offset where the next part of the
     * buffer starts, which may be @ielen if the entire (remainder)
     * of the buffer should be used.
     */
    static inline size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
    					const u8 *ids, int n_ids, size_t offset)
    {
    	return ieee80211_ie_split_ric(ies, ielen, ids, n_ids, NULL, 0, offset);
    }
    
    /**
     * cfg80211_report_wowlan_wakeup - report wakeup from WoWLAN
     * @wdev: the wireless device reporting the wakeup
     * @wakeup: the wakeup report
     * @gfp: allocation flags
     *
     * This function reports that the given device woke up. If it
     * caused the wakeup, report the reason(s), otherwise you may
     * pass %NULL as the @wakeup parameter to advertise that something
     * else caused the wakeup.
     */
    void cfg80211_report_wowlan_wakeup(struct wireless_dev *wdev,
    				   struct cfg80211_wowlan_wakeup *wakeup,
    				   gfp_t gfp);
    
    /**
     * cfg80211_crit_proto_stopped() - indicate critical protocol stopped by driver.
     *
     * @wdev: the wireless device for which critical protocol is stopped.
     * @gfp: allocation flags
     *
     * This function can be called by the driver to indicate it has reverted
     * operation back to normal. One reason could be that the duration given
     * by .crit_proto_start() has expired.
     */
    void cfg80211_crit_proto_stopped(struct wireless_dev *wdev, gfp_t gfp);
    
    /**
     * ieee80211_get_num_supported_channels - get number of channels device has
     * @wiphy: the wiphy
     *
     * Return: the number of channels supported by the device.
     */
    unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy);
    
    /**
     * cfg80211_check_combinations - check interface combinations
     *
     * @wiphy: the wiphy
     * @num_different_channels: the number of different channels we want
     *	to use for verification
     * @radar_detect: a bitmap where each bit corresponds to a channel
     *	width where radar detection is needed, as in the definition of
     *	&struct ieee80211_iface_combination.@radar_detect_widths
     * @iftype_num: array with the numbers of interfaces of each interface
     *	type.  The index is the interface type as specified in &enum
     *	nl80211_iftype.
     *
     * This function can be called by the driver to check whether a
     * combination of interfaces and their types are allowed according to
     * the interface combinations.
     */
    int cfg80211_check_combinations(struct wiphy *wiphy,
    				const int num_different_channels,
    				const u8 radar_detect,
    				const int iftype_num[NUM_NL80211_IFTYPES]);
    
    /**
     * cfg80211_iter_combinations - iterate over matching combinations
     *
     * @wiphy: the wiphy
     * @num_different_channels: the number of different channels we want
     *	to use for verification
     * @radar_detect: a bitmap where each bit corresponds to a channel
     *	width where radar detection is needed, as in the definition of
     *	&struct ieee80211_iface_combination.@radar_detect_widths
     * @iftype_num: array with the numbers of interfaces of each interface
     *	type.  The index is the interface type as specified in &enum
     *	nl80211_iftype.
     * @iter: function to call for each matching combination
     * @data: pointer to pass to iter function
     *
     * This function can be called by the driver to check what possible
     * combinations it fits in at a given moment, e.g. for channel switching
     * purposes.
     */
    int cfg80211_iter_combinations(struct wiphy *wiphy,
    			       const int num_different_channels,
    			       const u8 radar_detect,
    			       const int iftype_num[NUM_NL80211_IFTYPES],
    			       void (*iter)(const struct ieee80211_iface_combination *c,
    					    void *data),
    			       void *data);
    
    /*
     * cfg80211_stop_iface - trigger interface disconnection
     *
     * @wiphy: the wiphy
     * @wdev: wireless device
     * @gfp: context flags
     *
     * Trigger interface to be stopped as if AP was stopped, IBSS/mesh left, STA
     * disconnected.
     *
     * Note: This doesn't need any locks and is asynchronous.
     */
    void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
    			 gfp_t gfp);
    
    /**
     * cfg80211_shutdown_all_interfaces - shut down all interfaces for a wiphy
     * @wiphy: the wiphy to shut down
     *
     * This function shuts down all interfaces belonging to this wiphy by
     * calling dev_close() (and treating non-netdev interfaces as needed).
     * It shouldn't really be used unless there are some fatal device errors
     * that really can't be recovered in any other way.
     *
     * Callers must hold the RTNL and be able to deal with callbacks into
     * the driver while the function is running.
     */
    void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy);
    
    /**
     * wiphy_ext_feature_set - set the extended feature flag
     *
     * @wiphy: the wiphy to modify.
     * @ftidx: extended feature bit index.
     *
     * The extended features are flagged in multiple bytes (see
     * &struct wiphy.@ext_features)
     */
    static inline void wiphy_ext_feature_set(struct wiphy *wiphy,
    					 enum nl80211_ext_feature_index ftidx)
    {
    	u8 *ft_byte;
    
    	ft_byte = &wiphy->ext_features[ftidx / 8];
    	*ft_byte |= BIT(ftidx % 8);
    }
    
    /**
     * wiphy_ext_feature_isset - check the extended feature flag
     *
     * @wiphy: the wiphy to modify.
     * @ftidx: extended feature bit index.
     *
     * The extended features are flagged in multiple bytes (see
     * &struct wiphy.@ext_features)
     */
    static inline bool
    wiphy_ext_feature_isset(struct wiphy *wiphy,
    			enum nl80211_ext_feature_index ftidx)
    {
    	u8 ft_byte;
    
    	ft_byte = wiphy->ext_features[ftidx / 8];
    	return (ft_byte & BIT(ftidx % 8)) != 0;
    }
    
    /**
     * cfg80211_free_nan_func - free NAN function
     * @f: NAN function that should be freed
     *
     * Frees all the NAN function and all it's allocated members.
     */
    void cfg80211_free_nan_func(struct cfg80211_nan_func *f);
    
    /**
     * struct cfg80211_nan_match_params - NAN match parameters
     * @type: the type of the function that triggered a match. If it is
     *	 %NL80211_NAN_FUNC_SUBSCRIBE it means that we replied to a subscriber.
     *	 If it is %NL80211_NAN_FUNC_PUBLISH, it means that we got a discovery
     *	 result.
     *	 If it is %NL80211_NAN_FUNC_FOLLOW_UP, we received a follow up.
     * @inst_id: the local instance id
     * @peer_inst_id: the instance id of the peer's function
     * @addr: the MAC address of the peer
     * @info_len: the length of the &info
     * @info: the Service Specific Info from the peer (if any)
     * @cookie: unique identifier of the corresponding function
     */
    struct cfg80211_nan_match_params {
    	enum nl80211_nan_function_type type;
    	u8 inst_id;
    	u8 peer_inst_id;
    	const u8 *addr;
    	u8 info_len;
    	const u8 *info;
    	u64 cookie;
    };
    
    /**
     * cfg80211_nan_match - report a match for a NAN function.
     * @wdev: the wireless device reporting the match
     * @match: match notification parameters
     * @gfp: allocation flags
     *
     * This function reports that the a NAN function had a match. This
     * can be a subscribe that had a match or a solicited publish that
     * was sent. It can also be a follow up that was received.
     */
    void cfg80211_nan_match(struct wireless_dev *wdev,
    			struct cfg80211_nan_match_params *match, gfp_t gfp);
    
    /**
     * cfg80211_nan_func_terminated - notify about NAN function termination.
     *
     * @wdev: the wireless device reporting the match
     * @inst_id: the local instance id
     * @reason: termination reason (one of the NL80211_NAN_FUNC_TERM_REASON_*)
     * @cookie: unique NAN function identifier
     * @gfp: allocation flags
     *
     * This function reports that the a NAN function is terminated.
     */
    void cfg80211_nan_func_terminated(struct wireless_dev *wdev,
    				  u8 inst_id,
    				  enum nl80211_nan_func_term_reason reason,
    				  u64 cookie, gfp_t gfp);
    
    /* ethtool helper */
    void cfg80211_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info);
    
    /* Logging, debugging and troubleshooting/diagnostic helpers. */
    
    /* wiphy_printk helpers, similar to dev_printk */
    
    #define wiphy_printk(level, wiphy, format, args...)		\
    	dev_printk(level, &(wiphy)->dev, format, ##args)
    #define wiphy_emerg(wiphy, format, args...)			\
    	dev_emerg(&(wiphy)->dev, format, ##args)
    #define wiphy_alert(wiphy, format, args...)			\
    	dev_alert(&(wiphy)->dev, format, ##args)
    #define wiphy_crit(wiphy, format, args...)			\
    	dev_crit(&(wiphy)->dev, format, ##args)
    #define wiphy_err(wiphy, format, args...)			\
    	dev_err(&(wiphy)->dev, format, ##args)
    #define wiphy_warn(wiphy, format, args...)			\
    	dev_warn(&(wiphy)->dev, format, ##args)
    #define wiphy_notice(wiphy, format, args...)			\
    	dev_notice(&(wiphy)->dev, format, ##args)
    #define wiphy_info(wiphy, format, args...)			\
    	dev_info(&(wiphy)->dev, format, ##args)
    
    #define wiphy_debug(wiphy, format, args...)			\
    	wiphy_printk(KERN_DEBUG, wiphy, format, ##args)
    
    #define wiphy_dbg(wiphy, format, args...)			\
    	dev_dbg(&(wiphy)->dev, format, ##args)
    
    #if defined(VERBOSE_DEBUG)
    #define wiphy_vdbg	wiphy_dbg
    #else
    #define wiphy_vdbg(wiphy, format, args...)				\
    ({									\
    	if (0)								\
    		wiphy_printk(KERN_DEBUG, wiphy, format, ##args);	\
    	0;								\
    })
    #endif
    
    /*
     * wiphy_WARN() acts like wiphy_printk(), but with the key difference
     * of using a WARN/WARN_ON to get the message out, including the
     * file/line information and a backtrace.
     */
    #define wiphy_WARN(wiphy, format, args...)			\
    	WARN(1, "wiphy: %s\n" format, wiphy_name(wiphy), ##args);
    
    #endif /* __NET_CFG80211_H */