cfg80211.h

#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 <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.
 */

/*
 * 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_NUM_BANDS: number of defined bands
 */
enum ieee80211_band {
	IEEE80211_BAND_2GHZ = NL80211_BAND_2GHZ,
	IEEE80211_BAND_5GHZ = NL80211_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
 * @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
 */
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 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
 * @ht_cap: HT 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;
};

/*
 * 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
 */
struct vif_params {
       int use_4addr;
};

/**
 * 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;
};

/**
 * 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 cfg80211_ap_settings - AP configuration
 *
 * Used to configure an AP interface.
 *
 * @channel: the channel to start the AP on
 * @channel_type: the channel type 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.
 */
struct cfg80211_ap_settings {
	struct ieee80211_channel *channel;
	enum nl80211_channel_type channel_type;

	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;
};

/**
 * 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_BLOCK: block traffic from this mesh peer
 */
enum plink_actions {
	PLINK_ACTION_INVALID,
	PLINK_ACTION_OPEN,
	PLINK_ACTION_BLOCK,
};

/**
 * enum station_parameters_apply_mask - station parameter values to apply
 * @STATION_PARAM_APPLY_UAPSD: apply new uAPSD parameters (uapsd_queues, max_sp)
 *
 * 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),
};

/**
 * 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
 * @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
 */
struct station_parameters {
	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;
	struct ieee80211_ht_cap *ht_capa;
	u8 uapsd_queues;
	u8 max_sp;
};

/**
 * 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: @txrate 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
 * @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
 */
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,
};

/**
 * 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;
};

/**
 * enum station_info_rate_flags - bitrate info flags
 *
 * Used by the driver to indicate the specific rate transmission
 * type for 802.11n transmissions.
 *
 * @BSS_PARAM_FLAGS_CTS_PROT: whether CTS protection is enabled
 * @BSS_PARAM_FLAGS_SHORT_PREAMBLE: whether short preamble is enabled
 * @BSS_PARAM_FLAGS_SHORT_SLOT_TIME: whether short slot time is enabled
 */
enum bss_param_flags {
	BSS_PARAM_FLAGS_CTS_PROT	= 1<<0,
	BSS_PARAM_FLAGS_SHORT_PREAMBLE	= 1<<1,
	BSS_PARAM_FLAGS_SHORT_SLOT_TIME	= 1<<2,
};

/**
 * struct sta_bss_parameters - BSS parameters for the attached station
 *
 * Information about the currently associated BSS
 *
 * @flags: bitflag of flags from &enum bss_param_flags
 * @dtim_period: DTIM period for the BSS
 * @beacon_interval: beacon interval
 */
struct sta_bss_parameters {
	u8 flags;
	u8 dtim_period;
	u16 beacon_interval;
};

/**
 * struct 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_.
 * @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.
 */
struct station_info {
	u32 filled;
	u32 connected_time;
	u32 inactive_time;
	u32 rx_bytes;
	u32 tx_bytes;
	u16 llid;
	u16 plid;
	u8 plink_state;
	s8 signal;
	s8 signal_avg;
	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;

	/*
	 * 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
 */
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_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)
 */
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;
};

/**
 * 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.
 */
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;
};

/**
 * struct mesh_setup - 802.11s mesh setup configuration
 * @channel: the channel to start the mesh network on
 * @channel_type: the channel type 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
 * @ie: vendor information elements (optional)
 * @ie_len: length of vendor information elements
 * @is_authenticated: this mesh requires authentication
 * @is_secure: this mesh uses security
 * @mcast_rate: multicat rate for Mesh Node [6Mbps is the default for 802.11a]
 *
 * These parameters are fixed when the mesh is created.
 */
struct mesh_setup {
	struct ieee80211_channel *channel;
	enum nl80211_channel_type channel_type;
	const u8 *mesh_id;
	u8 mesh_id_len;
	u8 sync_method;
	u8 path_sel_proto;
	u8 path_metric;
	const u8 *ie;
	u8 ie_len;
	bool is_authenticated;
	bool is_secure;
	int mcast_rate[IEEE80211_NUM_BANDS];
};

/**
 * 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;
};

/* from net/wireless.h */
struct wiphy;

/**
 * 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
 * @ie: optional information element(s) to add into Probe Request or %NULL
 * @ie_len: length of ie in octets
 * @rates: bitmap of rates to advertise for each band
 * @wiphy: the wiphy this was for
 * @dev: the interface
 * @aborted: (internal) scan request was notified as 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;
	const u8 *ie;
	size_t ie_len;

	u32 rates[IEEE80211_NUM_BANDS];

	/* internal */
	struct wiphy *wiphy;
	struct net_device *dev;
	bool aborted;
	bool no_cck;

	/* keep last */