#ifndef __NET_CFG80211_H
  #define __NET_CFG80211_H
  /*
   * 802.11 device and configuration interface
   *
   * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
   *
   * 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_band - supported frequency bands
   *
   * The bands are assigned this way because the supported
   * bitrates differ in these bands.
   *
   * @IEEE80211_BAND_2GHZ: 2.4GHz ISM band
   * @IEEE80211_BAND_5GHZ: around 5GHz band (4.9-5.7)
   * @IEEE80211_BAND_60GHZ: around 60 GHz band (58.32 - 64.80 GHz)
   * @IEEE80211_NUM_BANDS: number of defined bands
   */
  enum ieee80211_band {
  	IEEE80211_BAND_2GHZ = NL80211_BAND_2GHZ,
  	IEEE80211_BAND_5GHZ = NL80211_BAND_5GHZ,
  	IEEE80211_BAND_60GHZ = NL80211_BAND_60GHZ,
  
  	/* keep last */
  	IEEE80211_NUM_BANDS
  };
  
  /**
   * 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.
   */
  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,
  };
  
  #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.
   */
  struct ieee80211_channel {
  	enum ieee80211_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;
  };
  
  /**
   * 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,
  };
  
  /**
   * 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 ieee80211_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.
   */
  
  /**
   * struct vif_params - describes virtual interface parameters
   * @use_4addr: use 4-address frames
   * @macaddr: address to use for this virtual interface. This will only
   * 	be used for non-netdevice interfaces. If this parameter is set
   * 	to zero address the driver may determine the address as needed.
   */
  struct vif_params {
         int use_4addr;
         u8 macaddr[ETH_ALEN];
  };
  
  /**
   * 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 {
  	u8 *key;
  	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
   * Return: 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);
  
  /**
   * 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_CHANNEL_TIME: channel active time (in ms) was filled in
   * @SURVEY_INFO_CHANNEL_TIME_BUSY: channel busy time was filled in
   * @SURVEY_INFO_CHANNEL_TIME_EXT_BUSY: extension channel busy time was filled in
   * @SURVEY_INFO_CHANNEL_TIME_RX: channel receive time was filled in
   * @SURVEY_INFO_CHANNEL_TIME_TX: channel transmit 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 = 1<<0,
  	SURVEY_INFO_IN_USE = 1<<1,
  	SURVEY_INFO_CHANNEL_TIME = 1<<2,
  	SURVEY_INFO_CHANNEL_TIME_BUSY = 1<<3,
  	SURVEY_INFO_CHANNEL_TIME_EXT_BUSY = 1<<4,
  	SURVEY_INFO_CHANNEL_TIME_RX = 1<<5,
  	SURVEY_INFO_CHANNEL_TIME_TX = 1<<6,
  };
  
  /**
   * struct survey_info - channel survey response
   *
   * @channel: the channel this survey record reports, mandatory
   * @filled: bitflag of flags from &enum survey_info_flags
   * @noise: channel noise in dBm. This and all following fields are
   *	optional
   * @channel_time: amount of time in ms the radio spent on the channel
   * @channel_time_busy: amount of time the primary channel was sensed busy
   * @channel_time_ext_busy: amount of time the extension channel was sensed busy
   * @channel_time_rx: amount of time the radio spent receiving data
   * @channel_time_tx: amount of time the radio spent transmitting data
   *
   * 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 channel_time;
  	u64 channel_time_busy;
  	u64 channel_time_ext_busy;
  	u64 channel_time_rx;
  	u64 channel_time_tx;
  	u32 filled;
  	s8 noise;
  };
  
  /**
   * 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.
   */
  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 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[];
  };
  
  /**
   * 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)
   * @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
   * @radar_required: set if radar detection is required
   */
  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;
  	int inactivity_timeout;
  	u8 p2p_ctwindow;
  	bool p2p_opp_ps;
  	const struct cfg80211_acl_data *acl;
  	bool radar_required;
  };
  
  /**
   * 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_offset_beacon: offset for the counter within the beacon (tail)
   * @counter_offset_presp: offset for the counter within 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;
  	u16 counter_offset_beacon, counter_offset_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
   * @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
   */
  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;
  	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;
  };
  
  /**
   * enum cfg80211_station_type - the type of station being modified
   * @CFG80211_STA_AP_CLIENT: client of an AP interface
   * @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_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_flags - station information flags
   *
   * Used by the driver to indicate which info in &struct station_info
   * it has filled in during get_station() or dump_station().
   *
   * @STATION_INFO_INACTIVE_TIME: @inactive_time filled
   * @STATION_INFO_RX_BYTES: @rx_bytes filled
   * @STATION_INFO_TX_BYTES: @tx_bytes filled
   * @STATION_INFO_RX_BYTES64: @rx_bytes filled with 64-bit value
   * @STATION_INFO_TX_BYTES64: @tx_bytes filled with 64-bit value
   * @STATION_INFO_LLID: @llid filled
   * @STATION_INFO_PLID: @plid filled
   * @STATION_INFO_PLINK_STATE: @plink_state filled
   * @STATION_INFO_SIGNAL: @signal filled
   * @STATION_INFO_TX_BITRATE: @txrate fields are filled
   *	(tx_bitrate, tx_bitrate_flags and tx_bitrate_mcs)
   * @STATION_INFO_RX_PACKETS: @rx_packets filled with 32-bit value
   * @STATION_INFO_TX_PACKETS: @tx_packets filled with 32-bit value
   * @STATION_INFO_TX_RETRIES: @tx_retries filled
   * @STATION_INFO_TX_FAILED: @tx_failed filled
   * @STATION_INFO_RX_DROP_MISC: @rx_dropped_misc filled
   * @STATION_INFO_SIGNAL_AVG: @signal_avg filled
   * @STATION_INFO_RX_BITRATE: @rxrate fields are filled
   * @STATION_INFO_BSS_PARAM: @bss_param filled
   * @STATION_INFO_CONNECTED_TIME: @connected_time filled
   * @STATION_INFO_ASSOC_REQ_IES: @assoc_req_ies filled
   * @STATION_INFO_STA_FLAGS: @sta_flags filled
   * @STATION_INFO_BEACON_LOSS_COUNT: @beacon_loss_count filled
   * @STATION_INFO_T_OFFSET: @t_offset filled
   * @STATION_INFO_LOCAL_PM: @local_pm filled
   * @STATION_INFO_PEER_PM: @peer_pm filled
   * @STATION_INFO_NONPEER_PM: @nonpeer_pm filled
   * @STATION_INFO_CHAIN_SIGNAL: @chain_signal filled
   * @STATION_INFO_CHAIN_SIGNAL_AVG: @chain_signal_avg filled
   */
  enum station_info_flags {
  	STATION_INFO_INACTIVE_TIME	= 1<<0,
  	STATION_INFO_RX_BYTES		= 1<<1,
  	STATION_INFO_TX_BYTES		= 1<<2,
  	STATION_INFO_LLID		= 1<<3,
  	STATION_INFO_PLID		= 1<<4,
  	STATION_INFO_PLINK_STATE	= 1<<5,
  	STATION_INFO_SIGNAL		= 1<<6,
  	STATION_INFO_TX_BITRATE		= 1<<7,
  	STATION_INFO_RX_PACKETS		= 1<<8,
  	STATION_INFO_TX_PACKETS		= 1<<9,
  	STATION_INFO_TX_RETRIES		= 1<<10,
  	STATION_INFO_TX_FAILED		= 1<<11,
  	STATION_INFO_RX_DROP_MISC	= 1<<12,
  	STATION_INFO_SIGNAL_AVG		= 1<<13,
  	STATION_INFO_RX_BITRATE		= 1<<14,
  	STATION_INFO_BSS_PARAM          = 1<<15,
  	STATION_INFO_CONNECTED_TIME	= 1<<16,
  	STATION_INFO_ASSOC_REQ_IES	= 1<<17,
  	STATION_INFO_STA_FLAGS		= 1<<18,
  	STATION_INFO_BEACON_LOSS_COUNT	= 1<<19,
  	STATION_INFO_T_OFFSET		= 1<<20,
  	STATION_INFO_LOCAL_PM		= 1<<21,
  	STATION_INFO_PEER_PM		= 1<<22,
  	STATION_INFO_NONPEER_PM		= 1<<23,
  	STATION_INFO_RX_BYTES64		= 1<<24,
  	STATION_INFO_TX_BYTES64		= 1<<25,
  	STATION_INFO_CHAIN_SIGNAL	= 1<<26,
  	STATION_INFO_CHAIN_SIGNAL_AVG	= 1<<27,
  };
  
  /**
   * 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_40_MHZ_WIDTH: 40 MHz width transmission
   * @RATE_INFO_FLAGS_80_MHZ_WIDTH: 80 MHz width transmission
   * @RATE_INFO_FLAGS_80P80_MHZ_WIDTH: 80+80 MHz width transmission
   * @RATE_INFO_FLAGS_160_MHZ_WIDTH: 160 MHz width transmission
   * @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_40_MHZ_WIDTH		= BIT(2),
  	RATE_INFO_FLAGS_80_MHZ_WIDTH		= BIT(3),
  	RATE_INFO_FLAGS_80P80_MHZ_WIDTH		= BIT(4),
  	RATE_INFO_FLAGS_160_MHZ_WIDTH		= BIT(5),
  	RATE_INFO_FLAGS_SHORT_GI		= BIT(6),
  	RATE_INFO_FLAGS_60G			= BIT(7),
  };
  
  /**
   * 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)
   */
  struct rate_info {
  	u8 flags;
  	u8 mcs;
  	u16 legacy;
  	u8 nss;
  };
  
  /**
   * 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;
  };
  
  #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 from &enum station_info_flags
   * @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 received from this station
   * @tx_bytes: bytes 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 received from this station
   * @tx_packets: packets transmitted to this station
   * @tx_retries: cumulative retry counts
   * @tx_failed: number of failed transmissions (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
   */
  struct station_info {
  	u32 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;
  
  	/*
  	 * Note: Add a new enum station_info_flags value for each new field and
  	 * use it to check which fields are initialized.
  	 */
  };
  
  /**
   * 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;
  	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
   *
   * 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[IEEE80211_NUM_BANDS];
  	u32 basic_rates;
  };
  
  /**
   * 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_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
   * @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
   * @aborted: (internal) scan request was notified as aborted
   * @notified: (internal) scan request was notified as done or aborted
   * @no_cck: used to send probe requests at non CCK rate in 2GHz band
   */
  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;
  	u32 flags;
  
  	u32 rates[IEEE80211_NUM_BANDS];
  
  	struct wireless_dev *wdev;
  
  	/* internal */
  	struct wiphy *wiphy;
  	unsigned long scan_start;
  	bool aborted, notified;
  	bool no_cck;
  
  	/* keep last */
  	struct ieee80211_channel *channels[0];
  };
  
  /**
   * struct cfg80211_match_set - sets of attributes to match
   *
   * @ssid: SSID to be matched
   */
  struct cfg80211_match_set {
  	struct cfg80211_ssid ssid;
  };
  
  /**
   * 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
   * @interval: interval between each scheduled scan cycle
   * @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
   * @rssi_thold: don't report scan results below this threshold (in s32 dBm)
   */
  struct cfg80211_sched_scan_request {
  	struct cfg80211_ssid *ssids;
  	int n_ssids;
  	u32 n_channels;
  	enum nl80211_bss_scan_width scan_width;
  	u32 interval;
  	const u8 *ie;
  	size_t ie_len;
  	u32 flags;
  	struct cfg80211_match_set *match_sets;
  	int n_match_sets;
  	s32 rssi_thold;
  
  	/* internal */
  	struct wiphy *wiphy;
  	struct net_device *dev;
  	unsigned long scan_start;
  
  	/* 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_bss_ie_data - 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
   * @data: IE data
   */
  struct cfg80211_bss_ies {
  	u64 tsf;
  	struct rcu_head rcu_head;
  	int len;
  	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
   */
  enum cfg80211_assoc_req_flags {
  	ASSOC_REQ_DISABLE_HT		= BIT(0),
  	ASSOC_REQ_DISABLE_VHT		= BIT(1),
  };
  
  /**
   * 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
   * @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 {
  	u8 *ssid;
  	u8 *bssid;
  	struct cfg80211_chan_def chandef;
  	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[IEEE80211_NUM_BANDS];
  	struct ieee80211_ht_cap ht_capa;
  	struct ieee80211_ht_cap ht_capa_mask;
  };
  
  /**
   * 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)
   * @bssid: The AP BSSID or %NULL if not specified (auto-select based on scan
   *	results)
   * @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.
   */
  struct cfg80211_connect_params {
  	struct ieee80211_channel *channel;
  	u8 *bssid;
  	u8 *ssid;
  	size_t ssid_len;
  	enum nl80211_auth_type auth_type;
  	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;
  };
  
  /**
   * 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
   */
  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,
  };
  
  /*
   * 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];
  	} control[IEEE80211_NUM_BANDS];
  };
  /**
   * 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 {
  	u8 *bssid;
  	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 {
  	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.
   */
  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_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_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
   */
  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_gtk_rekey_data - rekey data
   * @kek: key encryption key
   * @kck: key confirmation key
   * @replay_ctr: replay counter
   */
  struct cfg80211_gtk_rekey_data {
  	u8 kek[NL80211_KEK_LEN];
  	u8 kck[NL80211_KCK_LEN];
  	u8 replay_ctr[NL80211_REPLAY_CTR_LEN];
  };
  
  /**
   * 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
   */
  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;
  };
  
  /**
   * 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_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; @mac may be NULL to remove all stations.
   * @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
   * @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.
   *
   * @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() with status code %WLAN_STATUS_SUCCESS.
   *	If the connection fails for some reason, call cfg80211_connect_result()
   *	with the status from the AP.
   *	(invoked with the wireless_dev mutex held)
   * @disconnect: Disconnect from the BSS/ESS.
   *	(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.
   * @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.
   *
   * @mgmt_frame_register: Notify driver that a management frame type was
   *	registered. Note that this callback may not sleep, and cannot run
   *	concurrently with itself.
   *
   * @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).
   *
   * @set_ringparam: Set tx and rx ring sizes.
   *
   * @get_ringparam: Get tx and rx ring current and maximum sizes.
   *
   * @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_et_sset_count:  Ethtool API to get string-set count.
   *	See @ethtool_ops.get_sset_count
   *
   * @get_et_stats:  Ethtool API to get a set of u64 stats.
   *	See @ethtool_ops.get_ethtool_stats
   *
   * @get_et_strings:  Ethtool API to get a set of strings to describe stats
   *	and perhaps other supported types of ethtool data-sets.
   *	See @ethtool_ops.get_strings
   *
   * @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)
   *
   * @set_qos_map: Set QoS mapping information to the driver
   */
  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,
  						  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,
  			       u8 *mac, struct station_parameters *params);
  	int	(*del_station)(struct wiphy *wiphy, struct net_device *dev,
  			       u8 *mac);
  	int	(*change_station)(struct wiphy *wiphy, struct net_device *dev,
  				  u8 *mac, struct station_parameters *params);
  	int	(*get_station)(struct wiphy *wiphy, struct net_device *dev,
  			       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,
  			       u8 *dst, u8 *next_hop);
  	int	(*del_mpath)(struct wiphy *wiphy, struct net_device *dev,
  			       u8 *dst);
  	int	(*change_mpath)(struct wiphy *wiphy, struct net_device *dev,
  				  u8 *dst, 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_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	(*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);
  
  	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[IEEE80211_NUM_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	(*set_ringparam)(struct wiphy *wiphy, u32 tx, u32 rx);
  	void	(*get_ringparam)(struct wiphy *wiphy,
  				 u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max);
  
  	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,
  			     u8 *peer, u8 action_code,  u8 dialog_token,
  			     u16 status_code, const u8 *buf, size_t len);
  	int	(*tdls_oper)(struct wiphy *wiphy, struct net_device *dev,
  			     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_et_sset_count)(struct wiphy *wiphy,
  				     struct net_device *dev, int sset);
  	void	(*get_et_stats)(struct wiphy *wiphy, struct net_device *dev,
  				struct ethtool_stats *stats, u64 *data);
  	void	(*get_et_strings)(struct wiphy *wiphy, struct net_device *dev,
  				  u32 sset, u8 *data);
  
  	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);
  	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);
  };
  
  /*
   * 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, ...).
   */
  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),
  };
  
  /**
   * 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
   *
   * These examples can be expressed as follows:
   *
   * Allow #STA <= 1, #AP <= 1, matching BI, channels = 1, 2 total:
   *
   *  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,
   *  };
   *
   *
   * Allow #{AP, P2P-GO} <= 8, channels = 1, 8 total:
   *
   *  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,
   *  };
   *
   *
   * Allow #STA <= 1, #{P2P-client,P2P-GO} <= 3 on two channels, 4 total.
   * This allows for an infrastructure connection and three P2P connections.
   *
   *  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;
  };
  
  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
   */
  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),
  };
  
  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
   * @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;
  	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
   */
  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);
  };
  
  /**
   * 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:...:00:0f. 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.
   * @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
   * @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.
   *
   * @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.
   * @extended_capabilities_mask: mask of the valid values
   * @extended_capabilities_len: length of the extended capabilities
   * @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
   */
  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;
  
  	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;
  
  	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;
  
  	/* 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[IEEE80211_NUM_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;
  
  #ifdef CONFIG_NET_NS
  	/* the network namespace this phy lives in currently */
  	struct net *_net;
  #endif
  
  #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;
  
  	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 - 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.
   */
  struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv);
  
  /**
   * 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
   * @channel: (private) Used by the internal configuration code to track
   *	the user-set AP, monitor and WDS channel
   * @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
   * @cac_started: true if DFS channel availability check has been started
   * @cac_start_time: timestamp (jiffies) when the dfs state was entered.
   * @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
   * @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
   */
  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;
  
  	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;
  
  	struct list_head event_list;
  	spinlock_t event_lock;
  
  	struct cfg80211_internal_bss *current_bss; /* associated / joined */
  	struct cfg80211_chan_def preset_chandef;
  
  	/* for AP and mesh channel tracking */
  	struct ieee80211_channel *channel;
  
  	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;
  
  #ifdef CONFIG_CFG80211_WEXT
  	/* wext data */
  	struct {
  		struct cfg80211_ibss_params ibss;
  		struct cfg80211_connect_params connect;
  		struct cfg80211_cached_keys *keys;
  		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 ieee80211_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, 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 - 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.
   */
  const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len);
  
  /**
   * cfg80211_find_vendor_ie - find vendor specific information element in data
   *
   * @oui: vendor OUI
   * @oui_type: vendor-specific OUI type
   * @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, u8 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);
  
  /**
   * 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
   * WIPHY_FLAG_CUSTOM_REGULATORY 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
   * @aborted: set to true if the scan was aborted for any reason,
   *	userspace will be notified of that
   */
  void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted);
  
  /**
   * 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_width_frame - inform cfg80211 of a received BSS frame
   *
   * @wiphy: the wiphy reporting the BSS
   * @channel: The channel the frame was received on
   * @scan_width: width of the control channel
   * @mgmt: the management frame (probe response or beacon)
   * @len: length of the management frame
   * @signal: the signal strength, type depends on the wiphy's signal_type
   * @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_width_frame(struct wiphy *wiphy,
  				struct ieee80211_channel *channel,
  				enum nl80211_bss_scan_width scan_width,
  				struct ieee80211_mgmt *mgmt, size_t len,
  				s32 signal, gfp_t gfp);
  
  static inline struct cfg80211_bss * __must_check
  cfg80211_inform_bss_frame(struct wiphy *wiphy,
  			  struct ieee80211_channel *channel,
  			  struct ieee80211_mgmt *mgmt, size_t len,
  			  s32 signal, gfp_t gfp)
  {
  	return cfg80211_inform_bss_width_frame(wiphy, channel,
  					       NL80211_BSS_CHAN_WIDTH_20,
  					       mgmt, len, signal, gfp);
  }
  
  /**
   * cfg80211_inform_bss - inform cfg80211 of a new BSS
   *
   * @wiphy: the wiphy reporting the BSS
   * @channel: The channel the frame was received on
   * @scan_width: width of the control channel
   * @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
   * @signal: the signal strength, type depends on the wiphy's signal_type
   * @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_width(struct wiphy *wiphy,
  			  struct ieee80211_channel *channel,
  			  enum nl80211_bss_scan_width scan_width,
  			  const u8 *bssid, u64 tsf, u16 capability,
  			  u16 beacon_interval, const u8 *ie, size_t ielen,
  			  s32 signal, gfp_t gfp);
  
  static inline struct cfg80211_bss * __must_check
  cfg80211_inform_bss(struct wiphy *wiphy,
  		    struct ieee80211_channel *channel,
  		    const u8 *bssid, u64 tsf, u16 capability,
  		    u16 beacon_interval, const u8 *ie, size_t ielen,
  		    s32 signal, gfp_t gfp)
  {
  	return cfg80211_inform_bss_width(wiphy, channel,
  					 NL80211_BSS_CHAN_WIDTH_20,
  					 bssid, tsf, capability,
  					 beacon_interval, ie, ielen, signal,
  					 gfp);
  }
  
  struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
  				      struct ieee80211_channel *channel,
  				      const u8 *bssid,
  				      const u8 *ssid, size_t ssid_len,
  				      u16 capa_mask, u16 capa_val);
  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,
  				WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
  }
  
  /**
   * 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
   *
   * 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);
  
  /**
   * 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
   * @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, 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,
  					   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
   * @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.
   *
   * 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, int approxlen,
  			    int event_idx, gfp_t gfp)
  {
  	return __cfg80211_alloc_event_skb(wiphy, 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, 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_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.
   */
  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_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
   * @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,
  			   u8 *ie, size_t ie_len, 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 - notify userspace about deletion of a station
   *
   * @dev: the netdev
   * @mac_addr: the station's address
   * @gfp: allocation flags
   */
  void cfg80211_del_sta(struct net_device *dev, const u8 *mac_addr, gfp_t 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
   * @gfp: context 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, gfp_t gfp);
  
  /**
   * 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_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_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_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
   *
   * 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);
  
  /*
   * 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);
  
  /**
   * 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 ieee80211_band *band);
  
  /*
   * 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);
  
  /**
   * 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);
  
  /* 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
  " format, wiphy_name(wiphy), ##args);
  
  #endif /* __NET_CFG80211_H */