text: #ifndef __NET_CFG80211_H
  #define __NET_CFG80211_H
  /*
   * 802.11 device and configuration interface
   *
   * Copyright 2006-2009	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/netlink.h>
  #include <linux/skbuff.h>
  #include <linux/nl80211.h>
  #include <linux/if_ether.h>
  #include <linux/ieee80211.h>
  #include <net/regulatory.h>
  
  /* remove once we remove the wext stuff */
  #include <net/iw_handler.h>
  #include <linux/wireless.h>
  
  
  /*
   * 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)
   */
  enum ieee80211_band {
  	IEEE80211_BAND_2GHZ,
  	IEEE80211_BAND_5GHZ,
  
  	/* 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_PASSIVE_SCAN: Only passive scanning is permitted
   *	on this channel.
   * @IEEE80211_CHAN_NO_IBSS: IBSS is not allowed on this channel.
   * @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.
   */
  enum ieee80211_channel_flags {
  	IEEE80211_CHAN_DISABLED		= 1<<0,
  	IEEE80211_CHAN_PASSIVE_SCAN	= 1<<1,
  	IEEE80211_CHAN_NO_IBSS		= 1<<2,
  	IEEE80211_CHAN_RADAR		= 1<<3,
  	IEEE80211_CHAN_NO_HT40PLUS	= 1<<4,
  	IEEE80211_CHAN_NO_HT40MINUS	= 1<<5,
  };
  
  #define IEEE80211_CHAN_NO_HT40 \
  	(IEEE80211_CHAN_NO_HT40PLUS | IEEE80211_CHAN_NO_HT40MINUS)
  
  /**
   * struct ieee80211_channel - channel definition
   *
   * This structure describes a single channel for use
   * with cfg80211.
   *
   * @center_freq: center frequency in MHz
   * @max_bandwidth: maximum allowed bandwidth for this channel, 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)
   * @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 is useful only on 5 GHz band.
   * @orig_mag: internal use
   * @orig_mpwr: internal use
   */
  struct ieee80211_channel {
  	enum ieee80211_band band;
  	u16 center_freq;
  	u8 max_bandwidth;
  	u16 hw_value;
  	u32 flags;
  	int max_antenna_gain;
  	int max_power;
  	bool beacon_found;
  	u32 orig_flags;
  	int orig_mag, orig_mpwr;
  };
  
  /**
   * 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.
   */
  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,
  };
  
  /**
   * 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_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
   */
  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;
  };
  
  /*
   * Wireless hardware/device configuration structures and methods
   */
  
  /**
   * struct vif_params - describes virtual interface parameters
   * @mesh_id: mesh ID to use
   * @mesh_id_len: length of the mesh ID
   */
  struct vif_params {
         u8 *mesh_id;
         int mesh_id_len;
  };
  
  /**
   * struct key_params - key information
   *
   * Information about a key
   *
   * @key: key material
   * @key_len: length of key material
   * @cipher: cipher suite selector
   * @seq: sequence counter (IV/PN) for TKIP and CCMP keys, only used
   *	with the get_key() callback, must be in little endian,
   *	length given by @seq_len.
   */
  struct key_params {
  	u8 *key;
  	u8 *seq;
  	int key_len;
  	int seq_len;
  	u32 cipher;
  };
  
  /**
   * struct beacon_parameters - beacon parameters
   *
   * Used to configure the beacon for an interface.
   *
   * @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
   * @interval: beacon interval or zero if not changed
   * @dtim_period: DTIM period or zero if not changed
   * @head_len: length of @head
   * @tail_len: length of @tail
   */
  struct beacon_parameters {
  	u8 *head, *tail;
  	int interval, dtim_period;
  	int head_len, tail_len;
  };
  
  /**
   * enum plink_action - actions to perform in mesh peers
   *
   * @PLINK_ACTION_INVALID: action 0 is reserved
   * @PLINK_ACTION_OPEN: start mesh peer link establishment
   * @PLINK_ACTION_BLOCL: block traffic from this mesh peer
   */
  enum plink_actions {
  	PLINK_ACTION_INVALID,
  	PLINK_ACTION_OPEN,
  	PLINK_ACTION_BLOCK,
  };
  
  /**
   * 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
   */
  struct station_parameters {
  	u8 *supported_rates;
  	struct net_device *vlan;
  	u32 sta_flags_mask, sta_flags_set;
  	int listen_interval;
  	u16 aid;
  	u8 supported_rates_len;
  	u8 plink_action;
  	struct ieee80211_ht_cap *ht_capa;
  };
  
  /**
   * 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_LLID: @llid filled
   * @STATION_INFO_PLID: @plid filled
   * @STATION_INFO_PLINK_STATE: @plink_state filled
   * @STATION_INFO_SIGNAL: @signal filled
   * @STATION_INFO_TX_BITRATE: @tx_bitrate fields are filled
   *  (tx_bitrate, tx_bitrate_flags and tx_bitrate_mcs)
   * @STATION_INFO_RX_PACKETS: @rx_packets filled
   * @STATION_INFO_TX_PACKETS: @tx_packets 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,
  };
  
  /**
   * 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: @tx_bitrate_mcs filled
   * @RATE_INFO_FLAGS_40_MHZ_WIDTH: 40 Mhz width transmission
   * @RATE_INFO_FLAGS_SHORT_GI: 400ns guard interval
   */
  enum rate_info_flags {
  	RATE_INFO_FLAGS_MCS		= 1<<0,
  	RATE_INFO_FLAGS_40_MHZ_WIDTH	= 1<<1,
  	RATE_INFO_FLAGS_SHORT_GI	= 1<<2,
  };
  
  /**
   * 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
   */
  struct rate_info {
  	u8 flags;
  	u8 mcs;
  	u16 legacy;
  };
  
  /**
   * 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
   * @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: signal strength of last received packet in dBm
   * @txrate: current unicast bitrate to this station
   * @rx_packets: packets received from this station
   * @tx_packets: packets transmitted to this station
   */
  struct station_info {
  	u32 filled;
  	u32 inactive_time;
  	u32 rx_bytes;
  	u32 tx_bytes;
  	u16 llid;
  	u16 plid;
  	u8 plink_state;
  	s8 signal;
  	struct rate_info txrate;
  	u32 rx_packets;
  	u32 tx_packets;
  };
  
  /**
   * 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
   */
  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,
  };
  
  /**
   * 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_DSN: @dsn 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_DSN			= 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
   * @dsn: destination 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
   */
  struct mpath_info {
  	u32 filled;
  	u32 frame_qlen;
  	u32 dsn;
  	u32 metric;
  	u32 exptime;
  	u32 discovery_timeout;
  	u8 discovery_retries;
  	u8 flags;
  };
  
  /**
   * 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
   */
  struct bss_parameters {
  	int use_cts_prot;
  	int use_short_preamble;
  	int use_short_slot_time;
  	u8 *basic_rates;
  	u8 basic_rates_len;
  };
  
  struct mesh_config {
  	/* Timeouts in ms */
  	/* Mesh plink management parameters */
  	u16 dot11MeshRetryTimeout;
  	u16 dot11MeshConfirmTimeout;
  	u16 dot11MeshHoldingTimeout;
  	u16 dot11MeshMaxPeerLinks;
  	u8  dot11MeshMaxRetries;
  	u8  dot11MeshTTL;
  	bool auto_open_plinks;
  	/* HWMP parameters */
  	u8  dot11MeshHWMPmaxPREQretries;
  	u32 path_refresh_time;
  	u16 min_discovery_timeout;
  	u32 dot11MeshHWMPactivePathTimeout;
  	u16 dot11MeshHWMPpreqMinInterval;
  	u16 dot11MeshHWMPnetDiameterTraversalTime;
  };
  
  /**
   * struct ieee80211_txq_params - TX queue parameters
   * @queue: TX queue identifier (NL80211_TXQ_Q_*)
   * @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_txq_q queue;
  	u16 txop;
  	u16 cwmin;
  	u16 cwmax;
  	u8 aifs;
  };
  
  /* from net/wireless.h */
  struct wiphy;
  
  /* from net/ieee80211.h */
  struct ieee80211_channel;
  
  /**
   * 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: number of channels for each band
   * @ie: optional information element(s) to add into Probe Request or %NULL
   * @ie_len: length of ie in octets
   * @wiphy: the wiphy this was for
   * @ifidx: the interface index
   */
  struct cfg80211_scan_request {
  	struct cfg80211_ssid *ssids;
  	int n_ssids;
  	struct ieee80211_channel **channels;
  	u32 n_channels;
  	const u8 *ie;
  	size_t ie_len;
  
  	/* internal */
  	struct wiphy *wiphy;
  	int ifidx;
  };
  
  /**
   * 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 - BSS description
   *
   * This structure describes a BSS (which may also be a mesh network)
   * for use in scan results and similar.
   *
   * @bssid: BSSID of the BSS
   * @tsf: timestamp of last received update
   * @beacon_interval: the beacon interval as from the frame
   * @capability: the capability field in host byte order
   * @information_elements: the information elements (Note that there
   *	is no guarantee that these are well-formed!)
   * @len_information_elements: total length of the information elements
   * @signal: signal strength value (type depends on the wiphy's signal_type)
   * @hold: BSS should not expire
   * @free_priv: function pointer to free private data
   * @priv: private area for driver use, has at least wiphy->bss_priv_size bytes
   */
  struct cfg80211_bss {
  	struct ieee80211_channel *channel;
  
  	u8 bssid[ETH_ALEN];
  	u64 tsf;
  	u16 beacon_interval;
  	u16 capability;
  	u8 *information_elements;
  	size_t len_information_elements;
  
  	s32 signal;
  
  	void (*free_priv)(struct cfg80211_bss *bss);
  	u8 priv[0] __attribute__((__aligned__(sizeof(void *))));
  };
  
  /**
   * struct cfg80211_auth_request - Authentication request data
   *
   * This structure provides information needed to complete IEEE 802.11
   * authentication.
   * NOTE: This structure will likely change when more code from mac80211 is
   * moved into cfg80211 so that non-mac80211 drivers can benefit from it, too.
   * Before using this in a driver that does not use mac80211, it would be better
   * to check the status of that work and better yet, volunteer to work on it.
   *
   * @chan: The channel to use or %NULL if not specified (auto-select based on
   *	scan results)
   * @peer_addr: The address of the peer STA (AP BSSID in infrastructure case);
   *	this field is required to be present; if the driver wants to help with
   *	BSS selection, it should use (yet to be added) MLME event to allow user
   *	space SME to be notified of roaming candidate, so that the SME can then
   *	use the authentication request with the recommended BSSID and whatever
   *	other data may be needed for authentication/association
   * @ssid: SSID or %NULL if not yet available
   * @ssid_len: Length of ssid in octets
   * @auth_type: Authentication type (algorithm)
   * @ie: Extra IEs to add to Authentication frame or %NULL
   * @ie_len: Length of ie buffer in octets
   */
  struct cfg80211_auth_request {
  	struct ieee80211_channel *chan;
  	u8 *peer_addr;
  	const u8 *ssid;
  	size_t ssid_len;
  	enum nl80211_auth_type auth_type;
  	const u8 *ie;
  	size_t ie_len;
  };
  
  /**
   * struct cfg80211_assoc_request - (Re)Association request data
   *
   * This structure provides information needed to complete IEEE 802.11
   * (re)association.
   * NOTE: This structure will likely change when more code from mac80211 is
   * moved into cfg80211 so that non-mac80211 drivers can benefit from it, too.
   * Before using this in a driver that does not use mac80211, it would be better
   * to check the status of that work and better yet, volunteer to work on it.
   *
   * @chan: The channel to use or %NULL if not specified (auto-select based on
   *	scan results)
   * @peer_addr: The address of the peer STA (AP BSSID); this field is required
   *	to be present and the STA must be in State 2 (authenticated) with the
   *	peer STA
   * @ssid: SSID
   * @ssid_len: Length of ssid in octets
   * @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
   * @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.
   */
  struct cfg80211_assoc_request {
  	struct ieee80211_channel *chan;
  	u8 *peer_addr;
  	const u8 *ssid;
  	size_t ssid_len;
  	const u8 *ie;
  	size_t ie_len;
  	bool use_mfp;
  	bool control_port;
  };
  
  /**
   * struct cfg80211_deauth_request - Deauthentication request data
   *
   * This structure provides information needed to complete IEEE 802.11
   * deauthentication.
   *
   * @peer_addr: The address of the peer STA (AP BSSID); this field is required
   *	to be present and the STA must be authenticated with the peer STA
   * @ie: Extra IEs to add to Deauthentication frame or %NULL
   * @ie_len: Length of ie buffer in octets
   */
  struct cfg80211_deauth_request {
  	u8 *peer_addr;
  	u16 reason_code;
  	const u8 *ie;
  	size_t ie_len;
  };
  
  /**
   * struct cfg80211_disassoc_request - Disassociation request data
   *
   * This structure provides information needed to complete IEEE 802.11
   * disassocation.
   *
   * @peer_addr: The address of the peer STA (AP BSSID); this field is required
   *	to be present and the STA must be associated with the peer STA
   * @ie: Extra IEs to add to Disassociation frame or %NULL
   * @ie_len: Length of ie buffer in octets
   */
  struct cfg80211_disassoc_request {
  	u8 *peer_addr;
  	u16 reason_code;
  	const u8 *ie;
  	size_t ie_len;
  };
  
  /**
   * 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.
   * @channel: The channel to use if no IBSS can be found to join.
   * @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
   */
  struct cfg80211_ibss_params {
  	u8 *ssid;
  	u8 *bssid;
  	struct ieee80211_channel *channel;
  	u8 *ie;
  	u8 ssid_len, ie_len;
  	u16 beacon_interval;
  	bool channel_fixed;
  };
  
  /**
   * 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
   */
  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,
  };
  
  /**
   * enum tx_power_setting - TX power adjustment
   *
   * @TX_POWER_AUTOMATIC: the dbm parameter is ignored
   * @TX_POWER_LIMITED: limit TX power by the dbm parameter
   * @TX_POWER_FIXED: fix TX power to the dbm parameter
   */
  enum tx_power_setting {
  	TX_POWER_AUTOMATIC,
  	TX_POWER_LIMITED,
  	TX_POWER_FIXED,
  };
  
  /**
   * 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
   * @resume: wiphy device needs to be resumed
   *
   * @add_virtual_intf: create a new virtual interface with the given name,
   *	must set the struct wireless_dev's iftype.
   *
   * @del_virtual_intf: remove the virtual interface determined by ifindex.
   *
   * @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
   *
   * @add_beacon: Add a beacon with given parameters, @head, @interval
   *	and @dtim_period will be valid, @tail is optional.
   * @set_beacon: Change the beacon parameters for an access point mode
   *	interface. This should reject the call when no beacon has been
   *	configured.
   * @del_beacon: Remove beacon configuration and stop sending the beacon.
   *
   * @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.
   *
   * @get_mesh_params: Put the current mesh parameters into *params
   *
   * @set_mesh_params: Set mesh parameters.
   *	The mask is a bitfield which tells us which parameters to
   *	set, and which to leave alone.
   *
   * @set_mesh_cfg: set mesh parameters (by now, just mesh id)
   *
   * @change_bss: Modify parameters for a given BSS.
   *
   * @set_txq_params: Set TX queue parameters
   *
   * @set_channel: Set channel
   *
   * @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
   * @assoc: Request to (re)associate with the specified peer
   * @deauth: Request to deauthenticate from the specified peer
   * @disassoc: Request to disassociate from the specified peer
   *
   * @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.
   * @leave_ibss: Leave the IBSS.
   *
   * @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
   * @get_tx_power: store the current TX power into the dbm variable;
   *	return 0 if successful
   *
   * @rfkill_poll: polls the hw rfkill line, use cfg80211 reporting
   *	functions to adjust rfkill hw state
   */
  struct cfg80211_ops {
  	int	(*suspend)(struct wiphy *wiphy);
  	int	(*resume)(struct wiphy *wiphy);
  
  	int	(*add_virtual_intf)(struct wiphy *wiphy, char *name,
  				    enum nl80211_iftype type, u32 *flags,
  				    struct vif_params *params);
  	int	(*del_virtual_intf)(struct wiphy *wiphy, int ifindex);
  	int	(*change_virtual_intf)(struct wiphy *wiphy, int ifindex,
  				       enum nl80211_iftype type, u32 *flags,
  				       struct vif_params *params);
  
  	int	(*add_key)(struct wiphy *wiphy, struct net_device *netdev,
  			   u8 key_index, const u8 *mac_addr,
  			   struct key_params *params);
  	int	(*get_key)(struct wiphy *wiphy, struct net_device *netdev,
  			   u8 key_index, 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, const u8 *mac_addr);
  	int	(*set_default_key)(struct wiphy *wiphy,
  				   struct net_device *netdev,
  				   u8 key_index);
  	int	(*set_default_mgmt_key)(struct wiphy *wiphy,
  					struct net_device *netdev,
  					u8 key_index);
  
  	int	(*add_beacon)(struct wiphy *wiphy, struct net_device *dev,
  			      struct beacon_parameters *info);
  	int	(*set_beacon)(struct wiphy *wiphy, struct net_device *dev,
  			      struct beacon_parameters *info);
  	int	(*del_beacon)(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_params)(struct wiphy *wiphy,
  				struct net_device *dev,
  				struct mesh_config *conf);
  	int	(*set_mesh_params)(struct wiphy *wiphy,
  				struct net_device *dev,
  				const struct mesh_config *nconf, u32 mask);
  	int	(*change_bss)(struct wiphy *wiphy, struct net_device *dev,
  			      struct bss_parameters *params);
  
  	int	(*set_txq_params)(struct wiphy *wiphy,
  				  struct ieee80211_txq_params *params);
  
  	int	(*set_channel)(struct wiphy *wiphy,
  			       struct ieee80211_channel *chan,
  			       enum nl80211_channel_type channel_type);
  
  	int	(*scan)(struct wiphy *wiphy, struct net_device *dev,
  			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	(*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_wiphy_params)(struct wiphy *wiphy, u32 changed);
  
  	int	(*set_tx_power)(struct wiphy *wiphy,
  				enum tx_power_setting type, int dbm);
  	int	(*get_tx_power)(struct wiphy *wiphy, int *dbm);
  
  	void	(*rfkill_poll)(struct wiphy *wiphy);
  };
  
  /*
   * wireless hardware and networking interfaces structures
   * and registration/helper functions
   */
  
  /**
   * struct wiphy - wireless hardware description
   * @idx: the wiphy index assigned to this item
   * @class_dev: the class device representing /sys/class/ieee80211/<wiphy-name>
   * @custom_regulatory: tells us the driver for this device
   * 	has its own custom regulatory domain and cannot identify the
   * 	ISO / IEC 3166 alpha2 it belongs to. When this is enabled
   * 	we will disregard the first regulatory hint (when the
   * 	initiator is %REGDOM_SET_BY_CORE).
   * @strict_regulatory: tells us the driver for this device will ignore
   * 	regulatory domain settings until it gets its own regulatory domain
   * 	via its regulatory_hint(). After its gets its own regulatory domain
   * 	it will only allow further regulatory domain settings to further
   * 	enhance compliance. For example if channel 13 and 14 are disabled
   * 	by this regulatory domain no user regulatory domain can enable these
   * 	channels at a later time. This can be used for devices which do not
   * 	have calibration information gauranteed for frequencies or settings
   * 	outside of its regulatory domain.
   * @disable_beacon_hints: enable this if your driver needs to ensure that
   *	passive scan flags and beaconing flags may not be lifted by cfg80211
   *	due to regulatory beacon hints. For more information on beacon
   *	hints read the documenation for regulatory_hint_found_beacon()
   * @reg_notifier: the driver's regulatory notification callback
   * @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
   */
  struct wiphy {
  	/* assign these fields before you register the wiphy */
  
  	/* permanent MAC address */
  	u8 perm_addr[ETH_ALEN];
  
  	/* Supported interface modes, OR together BIT(NL80211_IFTYPE_...) */
  	u16 interface_modes;
  
  	bool custom_regulatory;
  	bool strict_regulatory;
  	bool disable_beacon_hints;
  
  	enum cfg80211_signal_type signal_type;
  
  	int bss_priv_size;
  	u8 max_scan_ssids;
  	u16 max_scan_ie_len;
  
  	int n_cipher_suites;
  	const u32 *cipher_suites;
  
  	u8 retry_short;
  	u8 retry_long;
  	u32 frag_threshold;
  	u32 rts_threshold;
  
  	/* 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 */
  	int (*reg_notifier)(struct wiphy *wiphy,
  			    struct regulatory_request *request);
  
  	/* fields below are read-only, assigned by cfg80211 */
  
  	const struct ieee80211_regdomain *regd;
  
  	/* the item in /sys/class/ieee80211/ points to this,
  	 * you need use set_wiphy_dev() (see below) */
  	struct device dev;
  
  	/* dir in debugfs: ieee80211/<wiphyname> */
  	struct dentry *debugfsdir;
  
  	char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
  };
  
  /**
   * wiphy_priv - return priv from wiphy
   *
   * @wiphy: the wiphy whose priv pointer to return
   */
  static inline void *wiphy_priv(struct wiphy *wiphy)
  {
  	BUG_ON(!wiphy);
  	return &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
   */
  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
   */
  static inline const char *wiphy_name(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.
   *
   * The returned 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.
   *
   * Returns a non-negative wiphy index or a negative error code.
   */
  extern 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.
   */
  extern void wiphy_unregister(struct wiphy *wiphy);
  
  /**
   * wiphy_free - free wiphy
   *
   * @wiphy: The wiphy to free
   */
  extern void wiphy_free(struct wiphy *wiphy);
  
  /**
   * struct wireless_dev - wireless per-netdev state
   *
   * This structure must be allocated by the driver/stack
   * that uses the ieee80211_ptr field in struct net_device
   * (this is intentional so it can be allocated along with
   * the netdev.)
   *
   * @wiphy: pointer to hardware description
   * @iftype: interface type
   * @list: (private) Used to collect the interfaces
   * @netdev: (private) Used to reference back to the netdev
   * @current_bss: (private) Used by the internal configuration code
   * @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
   * @wext: (private) Used by the internal wireless extensions compat code
   * @wext_bssid: (private) Used by the internal wireless extensions compat code
   */
  struct wireless_dev {
  	struct wiphy *wiphy;
  	enum nl80211_iftype iftype;
  
  	/* private to the generic wireless code */
  	struct list_head list;
  	struct net_device *netdev;
  
  	/* currently used for IBSS - might be rearranged in the future */
  	struct cfg80211_bss *current_bss;
  	u8 bssid[ETH_ALEN];
  	u8 ssid[IEEE80211_MAX_SSID_LEN];
  	u8 ssid_len;
  
  #ifdef CONFIG_WIRELESS_EXT
  	/* wext data */
  	struct {
  		struct cfg80211_ibss_params ibss;
  		u8 bssid[ETH_ALEN];
  		s8 default_key, default_mgmt_key;
  	} wext;
  #endif
  };
  
  /**
   * wdev_priv - return wiphy priv from wireless_dev
   *
   * @wdev: The wireless device whose wiphy's priv pointer to return
   */
  static inline void *wdev_priv(struct wireless_dev *wdev)
  {
  	BUG_ON(!wdev);
  	return wiphy_priv(wdev->wiphy);
  }
  
  /*
   * Utility functions
   */
  
  /**
   * ieee80211_channel_to_frequency - convert channel number to frequency
   */
  extern int ieee80211_channel_to_frequency(int chan);
  
  /**
   * ieee80211_frequency_to_channel - convert frequency to channel number
   */
  extern 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.
   */
  extern struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
  							 int freq);
  /**
   * ieee80211_get_channel - get channel struct from wiphy for specified frequency
   */
  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
   *
   * This function returns 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);
  
  /*
   * Radiotap parsing functions -- for controlled injection support
   *
   * Implemented in net/wireless/radiotap.c
   * Documentation in Documentation/networking/radiotap-headers.txt
   */
  
  /**
   * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args
   * @rtheader: pointer to the radiotap header we are walking through
   * @max_length: length of radiotap header in cpu byte ordering
   * @this_arg_index: IEEE80211_RADIOTAP_... index of current arg
   * @this_arg: pointer to current radiotap arg
   * @arg_index: internal next argument index
   * @arg: internal next argument pointer
   * @next_bitmap: internal pointer to next present u32
   * @bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present
   */
  
  struct ieee80211_radiotap_iterator {
  	struct ieee80211_radiotap_header *rtheader;
  	int max_length;
  	int this_arg_index;
  	u8 *this_arg;
  
  	int arg_index;
  	u8 *arg;
  	__le32 *next_bitmap;
  	u32 bitmap_shifter;
  };
  
  extern int ieee80211_radiotap_iterator_init(
     struct ieee80211_radiotap_iterator *iterator,
     struct ieee80211_radiotap_header *radiotap_header,
     int max_length);
  
  extern 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
   *
   * Given an skb with a raw 802.11 header at the data pointer this function
   * returns the 802.11 header length in bytes (not including encryption
   * headers). If the data in the sk_buff is too short to contain a valid 802.11
   * header the function returns 0.
   *
   * @skb: the frame
   */
  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
   */
  unsigned int ieee80211_hdrlen(__le16 fc);
  
  /**
   * 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
   */
  int ieee80211_data_to_8023(struct sk_buff *skb, 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
   */
  int ieee80211_data_from_8023(struct sk_buff *skb, u8 *addr,
  			     enum nl80211_iftype iftype, u8 *bssid, bool qos);
  
  /**
   * cfg80211_classify8021d - determine the 802.1p/1d tag for a data frame
   * @skb: the data frame
   */
  unsigned int cfg80211_classify8021d(struct sk_buff *skb);
  
  /*
   * Regulatory helper functions for wiphys
   */
  
  /**
   * 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.
   */
  extern int regulatory_hint(struct wiphy *wiphy, const char *alpha2);
  
  /**
   * regulatory_hint_11d - hints a country IE as a regulatory domain
   * @wiphy: the wireless device giving the hint (used only for reporting
   *	conflicts)
   * @country_ie: pointer to the country IE
   * @country_ie_len: length of the country IE
   *
   * We will intersect the rd with the what CRDA tells us should apply
   * for the alpha2 this country IE belongs to, this prevents APs from
   * sending us incorrect or outdated information against a country.
   */
  extern void regulatory_hint_11d(struct wiphy *wiphy,
  				u8 *country_ie,
  				u8 country_ie_len);
  /**
   * 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.
   */
  extern 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
   * @desired_bw_khz: the desired max bandwidth you want to use per
   *	channel. Note that this is still 20 MHz if you want to use HT40
   *	as HT40 makes use of two channels for its 40 MHz width bandwidth.
   *	If set to 0 we'll assume you want the standard 20 MHz.
   * @reg_rule: the regulatory rule which we have for this frequency
   *
   * 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.
   *
   * Returns 0 if it was able to find a valid regulatory rule which does
   * apply to the given center_freq otherwise it returns non-zero. It will
   * also return -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 its 802.11 specific.
   */
  extern int freq_reg_info(struct wiphy *wiphy,
  			 u32 center_freq,
  			 u32 desired_bw_khz,
  			 const struct ieee80211_reg_rule **reg_rule);
  
  /*
   * Temporary wext handlers & helper functions
   *
   * In the future cfg80211 will simply assign the entire wext handler
   * structure to netdevs it manages, but we're not there yet.
   */
  int cfg80211_wext_giwname(struct net_device *dev,
  			  struct iw_request_info *info,
  			  char *name, char *extra);
  int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
  			  u32 *mode, char *extra);
  int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
  			  u32 *mode, char *extra);
  int cfg80211_wext_siwscan(struct net_device *dev,
  			  struct iw_request_info *info,
  			  union iwreq_data *wrqu, char *extra);
  int cfg80211_wext_giwscan(struct net_device *dev,
  			  struct iw_request_info *info,
  			  struct iw_point *data, char *extra);
  int cfg80211_wext_siwmlme(struct net_device *dev,
  			  struct iw_request_info *info,
  			  struct iw_point *data, char *extra);
  int cfg80211_wext_giwrange(struct net_device *dev,
  			   struct iw_request_info *info,
  			   struct iw_point *data, char *extra);
  int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
  			       struct iw_request_info *info,
  			       struct iw_freq *freq, char *extra);
  int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
  			       struct iw_request_info *info,
  			       struct iw_freq *freq, char *extra);
  int cfg80211_ibss_wext_siwessid(struct net_device *dev,
  				struct iw_request_info *info,
  				struct iw_point *data, char *ssid);
  int cfg80211_ibss_wext_giwessid(struct net_device *dev,
  				struct iw_request_info *info,
  				struct iw_point *data, char *ssid);
  int cfg80211_ibss_wext_siwap(struct net_device *dev,
  			     struct iw_request_info *info,
  			     struct sockaddr *ap_addr, char *extra);
  int cfg80211_ibss_wext_giwap(struct net_device *dev,
  			     struct iw_request_info *info,
  			     struct sockaddr *ap_addr, char *extra);
  
  struct ieee80211_channel *cfg80211_wext_freq(struct wiphy *wiphy,
  					     struct iw_freq *freq);
  
  int cfg80211_wext_siwrts(struct net_device *dev,
  			 struct iw_request_info *info,
  			 struct iw_param *rts, char *extra);
  int cfg80211_wext_giwrts(struct net_device *dev,
  			 struct iw_request_info *info,
  			 struct iw_param *rts, char *extra);
  int cfg80211_wext_siwfrag(struct net_device *dev,
  			  struct iw_request_info *info,
  			  struct iw_param *frag, char *extra);
  int cfg80211_wext_giwfrag(struct net_device *dev,
  			  struct iw_request_info *info,
  			  struct iw_param *frag, char *extra);
  int cfg80211_wext_siwretry(struct net_device *dev,
  			   struct iw_request_info *info,
  			   struct iw_param *retry, char *extra);
  int cfg80211_wext_giwretry(struct net_device *dev,
  			   struct iw_request_info *info,
  			   struct iw_param *retry, char *extra);
  int cfg80211_wext_siwencodeext(struct net_device *dev,
  			       struct iw_request_info *info,
  			       struct iw_point *erq, char *extra);
  int cfg80211_wext_siwencode(struct net_device *dev,
  			    struct iw_request_info *info,
  			    struct iw_point *erq, char *keybuf);
  int cfg80211_wext_giwencode(struct net_device *dev,
  			    struct iw_request_info *info,
  			    struct iw_point *erq, char *keybuf);
  int cfg80211_wext_siwtxpower(struct net_device *dev,
  			     struct iw_request_info *info,
  			     union iwreq_data *data, char *keybuf);
  int cfg80211_wext_giwtxpower(struct net_device *dev,
  			     struct iw_request_info *info,
  			     union iwreq_data *data, char *keybuf);
  
  /*
   * 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_inform_bss - inform cfg80211 of a new BSS
   *
   * @wiphy: the wiphy reporting the BSS
   * @bss: the found BSS
   * @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.
   */
  struct cfg80211_bss*
  cfg80211_inform_bss_frame(struct wiphy *wiphy,
  			  struct ieee80211_channel *channel,
  			  struct ieee80211_mgmt *mgmt, size_t len,
  			  s32 signal, gfp_t gfp);
  
  struct cfg80211_bss*
  cfg80211_inform_bss(struct wiphy *wiphy,
  		    struct ieee80211_channel *channel,
  		    const u8 *bssid,
  		    u64 timestamp, u16 capability, u16 beacon_interval,
  		    const u8 *ie, size_t ielen,
  		    s32 signal, gfp_t 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);
  }
  
  struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
  				       struct ieee80211_channel *channel,
  				       const u8 *meshid, size_t meshidlen,
  				       const u8 *meshcfg);
  void cfg80211_put_bss(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);
  
  /**
   * cfg80211_send_rx_auth - notification of processed authentication
   * @dev: network device
   * @buf: authentication frame (header + body)
   * @len: length of the frame data
   *
   * This function is called whenever an authentication has been processed in
   * station mode. The driver is required to call either this function or
   * cfg80211_send_auth_timeout() to indicate the result of cfg80211_ops::auth()
   * call.
   */
  void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
  
  /**
   * cfg80211_send_auth_timeout - notification of timed out authentication
   * @dev: network device
   * @addr: The MAC address of the device with which the authentication timed out
   */
  void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr);
  
  /**
   * cfg80211_send_rx_assoc - notification of processed association
   * @dev: network device
   * @buf: (re)association response frame (header + body)
   * @len: length of the frame data
   *
   * This function is called whenever a (re)association response has been
   * processed in station mode. The driver is required to call either this
   * function or cfg80211_send_assoc_timeout() to indicate the result of
   * cfg80211_ops::assoc() call.
   */
  void cfg80211_send_rx_assoc(struct net_device *dev, const u8 *buf, size_t len);
  
  /**
   * cfg80211_send_assoc_timeout - notification of timed out association
   * @dev: network device
   * @addr: The MAC address of the device with which the association timed out
   */
  void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr);
  
  /**
   * cfg80211_send_deauth - notification of processed deauthentication
   * @dev: network device
   * @buf: deauthentication 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.
   */
  void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len);
  
  /**
   * cfg80211_send_disassoc - notification of processed disassociation
   * @dev: network device
   * @buf: disassociation response frame (header + body)
   * @len: length of the frame data
   *
   * This function is called whenever disassociation has been processed in
   * station mode. This includes both received disassociation frames and locally
   * generated ones.
   */
  void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len);
  
  /**
   * cfg80211_hold_bss - exclude bss from expiration
   * @bss: bss which should not expire
   *
   * In a case when the BSS is not updated but it shouldn't expire this
   * function can be used to mark the BSS to be excluded from expiration.
   */
  void cfg80211_hold_bss(struct cfg80211_bss *bss);
  
  /**
   * cfg80211_unhold_bss - remove expiration exception from the BSS
   * @bss: bss which can expire again
   *
   * This function marks the BSS to be expirable again.
   */
  void cfg80211_unhold_bss(struct cfg80211_bss *bss);
  
  /**
   * 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)
   * @tsc: The TSC value of the frame that generated the MIC failure (6 octets)
   *
   * 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);
  
  /**
   * 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);
  
  /**
   * 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);
  
  #endif /* __NET_CFG80211_H */
  