cgroup: s/cgroup_subsys_state/cgroup_css/ s/task_subsys_state/task_css/

[linux-2.6/btrfs-unstable.git] / include / net / 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 <linux/net.h>
#include <net/regulatory.h>

/**
 * DOC: Introduction
 *
 * cfg80211 is the configuration API for 802.11 devices in Linux. It bridges
 * userspace and drivers, and offers some utility functionality associated
 * with 802.11. cfg80211 must, directly or indirectly via mac80211, be used
 * by all modern wireless drivers in Linux, so that they offer a consistent
 * API through nl80211. For backward compatibility, cfg80211 also offers
 * wireless extensions to userspace, but hides them from drivers completely.
 *
 * Additionally, cfg80211 contains code to help enforce regulatory spectrum
 * use restrictions.
 */


/**
 * DOC: Device registration
 *
 * In order for a driver to use cfg80211, it must register the hardware device
 * with cfg80211. This happens through a number of hardware capability structs
 * described below.
 *
 * The fundamental structure for each device is the 'wiphy', of which each
 * instance describes a physical wireless device connected to the system. Each
 * such wiphy can have zero, one, or many virtual interfaces associated with
 * it, which need to be identified as such by pointing the network interface's
 * @ieee80211_ptr pointer to a &struct wireless_dev which further describes
 * the wireless part of the interface, normally this struct is embedded in the
 * network interface's private data area. Drivers can optionally allow creating
 * or destroying virtual interfaces on the fly, but without at least one or the
 * ability to create some the wireless device isn't useful.
 *
 * Each wiphy structure contains device capability information, and also has
 * a pointer to the various operations the driver offers. The definitions and
 * structures here describe these capabilities in detail.
 */

struct wiphy;

/*
 * wireless hardware capability structures
 */

/**
 * enum ieee80211_band - supported frequency bands
 *
 * The bands are assigned this way because the supported
 * bitrates differ in these bands.
 *
 * @IEEE80211_BAND_2GHZ: 2.4GHz ISM band
 * @IEEE80211_BAND_5GHZ: around 5GHz band (4.9-5.7)
 * @IEEE80211_BAND_60GHZ: around 60 GHz band (58.32 - 64.80 GHz)
 * @IEEE80211_NUM_BANDS: number of defined bands
 */
enum ieee80211_band {
        IEEE80211_BAND_2GHZ = NL80211_BAND_2GHZ,
        IEEE80211_BAND_5GHZ = NL80211_BAND_5GHZ,
        IEEE80211_BAND_60GHZ = NL80211_BAND_60GHZ,

        /* keep last */
        IEEE80211_NUM_BANDS
};

/**
 * enum ieee80211_channel_flags - channel flags
 *
 * Channel flags set by the regulatory control code.
 *
 * @IEEE80211_CHAN_DISABLED: This channel is disabled.
 * @IEEE80211_CHAN_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.
 * @IEEE80211_CHAN_NO_OFDM: OFDM is not allowed on this channel.
 * @IEEE80211_CHAN_NO_80MHZ: If the driver supports 80 MHz on the band,
 *      this flag indicates that an 80 MHz channel cannot use this
 *      channel as the control or any of the secondary channels.
 *      This may be due to the driver or due to regulatory bandwidth
 *      restrictions.
 * @IEEE80211_CHAN_NO_160MHZ: If the driver supports 160 MHz on the band,
 *      this flag indicates that an 160 MHz channel cannot use this
 *      channel as the control or any of the secondary channels.
 *      This may be due to the driver or due to regulatory bandwidth
 *      restrictions.
 */
enum ieee80211_channel_flags {
        IEEE80211_CHAN_DISABLED         = 1<<0,
        IEEE80211_CHAN_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,
        IEEE80211_CHAN_NO_OFDM          = 1<<6,
        IEEE80211_CHAN_NO_80MHZ         = 1<<7,
        IEEE80211_CHAN_NO_160MHZ        = 1<<8,
};

#define IEEE80211_CHAN_NO_HT40 \
        (IEEE80211_CHAN_NO_HT40PLUS | IEEE80211_CHAN_NO_HT40MINUS)

#define IEEE80211_DFS_MIN_CAC_TIME_MS           60000
#define IEEE80211_DFS_MIN_NOP_TIME_MS           (30 * 60 * 1000)

/**
 * struct ieee80211_channel - channel definition
 *
 * This structure describes a single channel for use
 * with cfg80211.
 *
 * @center_freq: center frequency in MHz
 * @hw_value: hardware-specific value for the channel
 * @flags: channel flags from &enum ieee80211_channel_flags.
 * @orig_flags: channel flags at registration time, used by regulatory
 *      code to support devices with additional restrictions
 * @band: band this channel belongs to.
 * @max_antenna_gain: maximum antenna gain in dBi
 * @max_power: maximum transmission power (in dBm)
 * @max_reg_power: maximum regulatory transmission power (in dBm)
 * @beacon_found: helper to regulatory code to indicate when a beacon
 *      has been found on this channel. Use regulatory_hint_found_beacon()
 *      to enable this, this is useful only on 5 GHz band.
 * @orig_mag: internal use
 * @orig_mpwr: internal use
 * @dfs_state: current state of this channel. Only relevant if radar is required
 *      on this channel.
 * @dfs_state_entered: timestamp (jiffies) when the dfs state was entered.
 */
struct ieee80211_channel {
        enum ieee80211_band band;
        u16 center_freq;
        u16 hw_value;
        u32 flags;
        int max_antenna_gain;
        int max_power;
        int max_reg_power;
        bool beacon_found;
        u32 orig_flags;
        int orig_mag, orig_mpwr;
        enum nl80211_dfs_state dfs_state;
        unsigned long dfs_state_entered;
};

/**
 * enum ieee80211_rate_flags - rate flags
 *
 * Hardware/specification flags for rates. These are structured
 * in a way that allows using the same bitrate structure for
 * different bands/PHY modes.
 *
 * @IEEE80211_RATE_SHORT_PREAMBLE: Hardware can send with short
 *      preamble on this bitrate; only relevant in 2.4GHz band and
 *      with CCK rates.
 * @IEEE80211_RATE_MANDATORY_A: This bitrate is a mandatory rate
 *      when used with 802.11a (on the 5 GHz band); filled by the
 *      core code when registering the wiphy.
 * @IEEE80211_RATE_MANDATORY_B: This bitrate is a mandatory rate
 *      when used with 802.11b (on the 2.4 GHz band); filled by the
 *      core code when registering the wiphy.
 * @IEEE80211_RATE_MANDATORY_G: This bitrate is a mandatory rate
 *      when used with 802.11g (on the 2.4 GHz band); filled by the
 *      core code when registering the wiphy.
 * @IEEE80211_RATE_ERP_G: This is an ERP rate in 802.11g mode.
 * @IEEE80211_RATE_SUPPORTS_5MHZ: Rate can be used in 5 MHz mode
 * @IEEE80211_RATE_SUPPORTS_10MHZ: Rate can be used in 10 MHz mode
 */
enum ieee80211_rate_flags {
        IEEE80211_RATE_SHORT_PREAMBLE   = 1<<0,
        IEEE80211_RATE_MANDATORY_A      = 1<<1,
        IEEE80211_RATE_MANDATORY_B      = 1<<2,
        IEEE80211_RATE_MANDATORY_G      = 1<<3,
        IEEE80211_RATE_ERP_G            = 1<<4,
        IEEE80211_RATE_SUPPORTS_5MHZ    = 1<<5,
        IEEE80211_RATE_SUPPORTS_10MHZ   = 1<<6,
};

/**
 * struct ieee80211_rate - bitrate definition
 *
 * This structure describes a bitrate that an 802.11 PHY can
 * operate with. The two values @hw_value and @hw_value_short
 * are only for driver use when pointers to this structure are
 * passed around.
 *
 * @flags: rate-specific flags
 * @bitrate: bitrate in units of 100 Kbps
 * @hw_value: driver/hardware value for this rate
 * @hw_value_short: driver/hardware value for this rate when
 *      short preamble is used
 */
struct ieee80211_rate {
        u32 flags;
        u16 bitrate;
        u16 hw_value, hw_value_short;
};

/**
 * struct ieee80211_sta_ht_cap - STA's HT capabilities
 *
 * This structure describes most essential parameters needed
 * to describe 802.11n HT capabilities for an STA.
 *
 * @ht_supported: is HT supported by the STA
 * @cap: HT capabilities map as described in 802.11n spec
 * @ampdu_factor: Maximum A-MPDU length factor
 * @ampdu_density: Minimum A-MPDU spacing
 * @mcs: Supported MCS rates
 */
struct ieee80211_sta_ht_cap {
        u16 cap; /* use IEEE80211_HT_CAP_ */
        bool ht_supported;
        u8 ampdu_factor;
        u8 ampdu_density;
        struct ieee80211_mcs_info mcs;
};

/**
 * struct ieee80211_sta_vht_cap - STA's VHT capabilities
 *
 * This structure describes most essential parameters needed
 * to describe 802.11ac VHT capabilities for an STA.
 *
 * @vht_supported: is VHT supported by the STA
 * @cap: VHT capabilities map as described in 802.11ac spec
 * @vht_mcs: Supported VHT MCS rates
 */
struct ieee80211_sta_vht_cap {
        bool vht_supported;
        u32 cap; /* use IEEE80211_VHT_CAP_ */
        struct ieee80211_vht_mcs_info vht_mcs;
};

/**
 * struct ieee80211_supported_band - frequency band definition
 *
 * This structure describes a frequency band a wiphy
 * is able to operate in.
 *
 * @channels: Array of channels the hardware can operate in
 *      in this band.
 * @band: the band this structure represents
 * @n_channels: Number of channels in @channels
 * @bitrates: Array of bitrates the hardware can operate with
 *      in this band. Must be sorted to give a valid "supported
 *      rates" IE, i.e. CCK rates first, then OFDM.
 * @n_bitrates: Number of bitrates in @bitrates
 * @ht_cap: HT capabilities in this band
 * @vht_cap: VHT capabilities in this band
 */
struct ieee80211_supported_band {
        struct ieee80211_channel *channels;
        struct ieee80211_rate *bitrates;
        enum ieee80211_band band;
        int n_channels;
        int n_bitrates;
        struct ieee80211_sta_ht_cap ht_cap;
        struct ieee80211_sta_vht_cap vht_cap;
};

/*
 * Wireless hardware/device configuration structures and methods
 */

/**
 * DOC: Actions and configuration
 *
 * Each wireless device and each virtual interface offer a set of configuration
 * operations and other actions that are invoked by userspace. Each of these
 * actions is described in the operations structure, and the parameters these
 * operations use are described separately.
 *
 * Additionally, some operations are asynchronous and expect to get status
 * information via some functions that drivers need to call.
 *
 * Scanning and BSS list handling with its associated functionality is described
 * in a separate chapter.
 */

/**
 * struct vif_params - describes virtual interface parameters
 * @use_4addr: use 4-address frames
 * @macaddr: address to use for this virtual interface. This will only
 *      be used for non-netdevice interfaces. If this parameter is set
 *      to zero address the driver may determine the address as needed.
 */
struct vif_params {
       int use_4addr;
       u8 macaddr[ETH_ALEN];
};

/**
 * struct key_params - key information
 *
 * Information about a key
 *
 * @key: key material
 * @key_len: length of key material
 * @cipher: cipher suite selector
 * @seq: sequence counter (IV/PN) for TKIP and CCMP keys, only used
 *      with the get_key() callback, must be in little endian,
 *      length given by @seq_len.
 * @seq_len: length of @seq.
 */
struct key_params {
        u8 *key;
        u8 *seq;
        int key_len;
        int seq_len;
        u32 cipher;
};

/**
 * struct cfg80211_chan_def - channel definition
 * @chan: the (control) channel
 * @width: channel width
 * @center_freq1: center frequency of first segment
 * @center_freq2: center frequency of second segment
 *      (only with 80+80 MHz)
 */
struct cfg80211_chan_def {
        struct ieee80211_channel *chan;
        enum nl80211_chan_width width;
        u32 center_freq1;
        u32 center_freq2;
};

/**
 * cfg80211_get_chandef_type - return old channel type from chandef
 * @chandef: the channel definition
 *
 * Return: The old channel type (NOHT, HT20, HT40+/-) from a given
 * chandef, which must have a bandwidth allowing this conversion.
 */
static inline enum nl80211_channel_type
cfg80211_get_chandef_type(const struct cfg80211_chan_def *chandef)
{
        switch (chandef->width) {
        case NL80211_CHAN_WIDTH_20_NOHT:
                return NL80211_CHAN_NO_HT;
        case NL80211_CHAN_WIDTH_20:
                return NL80211_CHAN_HT20;
        case NL80211_CHAN_WIDTH_40:
                if (chandef->center_freq1 > chandef->chan->center_freq)
                        return NL80211_CHAN_HT40PLUS;
                return NL80211_CHAN_HT40MINUS;
        default:
                WARN_ON(1);
                return NL80211_CHAN_NO_HT;
        }
}

/**
 * cfg80211_chandef_create - create channel definition using channel type
 * @chandef: the channel definition struct to fill
 * @channel: the control channel
 * @chantype: the channel type
 *
 * Given a channel type, create a channel definition.
 */
void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
                             struct ieee80211_channel *channel,
                             enum nl80211_channel_type chantype);

/**
 * cfg80211_chandef_identical - check if two channel definitions are identical
 * @chandef1: first channel definition
 * @chandef2: second channel definition
 *
 * Return: %true if the channels defined by the channel definitions are
 * identical, %false otherwise.
 */
static inline bool
cfg80211_chandef_identical(const struct cfg80211_chan_def *chandef1,
                           const struct cfg80211_chan_def *chandef2)
{
        return (chandef1->chan == chandef2->chan &&
                chandef1->width == chandef2->width &&
                chandef1->center_freq1 == chandef2->center_freq1 &&
                chandef1->center_freq2 == chandef2->center_freq2);
}

/**
 * cfg80211_chandef_compatible - check if two channel definitions are compatible
 * @chandef1: first channel definition
 * @chandef2: second channel definition
 *
 * Return: %NULL if the given channel definitions are incompatible,
 * chandef1 or chandef2 otherwise.
 */
const struct cfg80211_chan_def *
cfg80211_chandef_compatible(const struct cfg80211_chan_def *chandef1,
                            const struct cfg80211_chan_def *chandef2);

/**
 * cfg80211_chandef_valid - check if a channel definition is valid
 * @chandef: the channel definition to check
 * Return: %true if the channel definition is valid. %false otherwise.
 */
bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef);

/**
 * cfg80211_chandef_usable - check if secondary channels can be used
 * @wiphy: the wiphy to validate against
 * @chandef: the channel definition to check
 * @prohibited_flags: the regulatory channel flags that must not be set
 * Return: %true if secondary channels are usable. %false otherwise.
 */
bool cfg80211_chandef_usable(struct wiphy *wiphy,
                             const struct cfg80211_chan_def *chandef,
                             u32 prohibited_flags);

/**
 * ieee80211_chandef_rate_flags - returns rate flags for a channel
 *
 * In some channel types, not all rates may be used - for example CCK
 * rates may not be used in 5/10 MHz channels.
 *
 * @chandef: channel definition for the channel
 *
 * Returns: rate flags which apply for this channel
 */
static inline enum ieee80211_rate_flags
ieee80211_chandef_rate_flags(struct cfg80211_chan_def *chandef)
{
        switch (chandef->width) {
        case NL80211_CHAN_WIDTH_5:
                return IEEE80211_RATE_SUPPORTS_5MHZ;
        case NL80211_CHAN_WIDTH_10:
                return IEEE80211_RATE_SUPPORTS_10MHZ;
        default:
                break;
        }
        return 0;
}

/**
 * enum survey_info_flags - survey information flags
 *
 * @SURVEY_INFO_NOISE_DBM: noise (in dBm) was filled in
 * @SURVEY_INFO_IN_USE: channel is currently being used
 * @SURVEY_INFO_CHANNEL_TIME: channel active time (in ms) was filled in
 * @SURVEY_INFO_CHANNEL_TIME_BUSY: channel busy time was filled in
 * @SURVEY_INFO_CHANNEL_TIME_EXT_BUSY: extension channel busy time was filled in
 * @SURVEY_INFO_CHANNEL_TIME_RX: channel receive time was filled in
 * @SURVEY_INFO_CHANNEL_TIME_TX: channel transmit time was filled in
 *
 * Used by the driver to indicate which info in &struct survey_info
 * it has filled in during the get_survey().
 */
enum survey_info_flags {
        SURVEY_INFO_NOISE_DBM = 1<<0,
        SURVEY_INFO_IN_USE = 1<<1,
        SURVEY_INFO_CHANNEL_TIME = 1<<2,
        SURVEY_INFO_CHANNEL_TIME_BUSY = 1<<3,
        SURVEY_INFO_CHANNEL_TIME_EXT_BUSY = 1<<4,
        SURVEY_INFO_CHANNEL_TIME_RX = 1<<5,
        SURVEY_INFO_CHANNEL_TIME_TX = 1<<6,
};

/**
 * struct survey_info - channel survey response
 *
 * @channel: the channel this survey record reports, mandatory
 * @filled: bitflag of flags from &enum survey_info_flags
 * @noise: channel noise in dBm. This and all following fields are
 *     optional
 * @channel_time: amount of time in ms the radio spent on the channel
 * @channel_time_busy: amount of time the primary channel was sensed busy
 * @channel_time_ext_busy: amount of time the extension channel was sensed busy
 * @channel_time_rx: amount of time the radio spent receiving data
 * @channel_time_tx: amount of time the radio spent transmitting data
 *
 * Used by dump_survey() to report back per-channel survey information.
 *
 * This structure can later be expanded with things like
 * channel duty cycle etc.
 */
struct survey_info {
        struct ieee80211_channel *channel;
        u64 channel_time;
        u64 channel_time_busy;
        u64 channel_time_ext_busy;
        u64 channel_time_rx;
        u64 channel_time_tx;
        u32 filled;
        s8 noise;
};

/**
 * struct cfg80211_crypto_settings - Crypto settings
 * @wpa_versions: indicates which, if any, WPA versions are enabled
 *      (from enum nl80211_wpa_versions)
 * @cipher_group: group key cipher suite (or 0 if unset)
 * @n_ciphers_pairwise: number of AP supported unicast ciphers
 * @ciphers_pairwise: unicast key cipher suites
 * @n_akm_suites: number of AKM suites
 * @akm_suites: AKM suites
 * @control_port: Whether user space controls IEEE 802.1X port, i.e.,
 *      sets/clears %NL80211_STA_FLAG_AUTHORIZED. If true, the driver is
 *      required to assume that the port is unauthorized until authorized by
 *      user space. Otherwise, port is marked authorized by default.
 * @control_port_ethertype: the control port protocol that should be
 *      allowed through even on unauthorized ports
 * @control_port_no_encrypt: TRUE to prevent encryption of control port
 *      protocol frames.
 */
struct cfg80211_crypto_settings {
        u32 wpa_versions;
        u32 cipher_group;
        int n_ciphers_pairwise;
        u32 ciphers_pairwise[NL80211_MAX_NR_CIPHER_SUITES];
        int n_akm_suites;
        u32 akm_suites[NL80211_MAX_NR_AKM_SUITES];
        bool control_port;
        __be16 control_port_ethertype;
        bool control_port_no_encrypt;
};

/**
 * struct cfg80211_beacon_data - beacon data
 * @head: head portion of beacon (before TIM IE)
 *     or %NULL if not changed
 * @tail: tail portion of beacon (after TIM IE)
 *     or %NULL if not changed
 * @head_len: length of @head
 * @tail_len: length of @tail
 * @beacon_ies: extra information element(s) to add into Beacon frames or %NULL
 * @beacon_ies_len: length of beacon_ies in octets
 * @proberesp_ies: extra information element(s) to add into Probe Response
 *      frames or %NULL
 * @proberesp_ies_len: length of proberesp_ies in octets
 * @assocresp_ies: extra information element(s) to add into (Re)Association
 *      Response frames or %NULL
 * @assocresp_ies_len: length of assocresp_ies in octets
 * @probe_resp_len: length of probe response template (@probe_resp)
 * @probe_resp: probe response template (AP mode only)
 */
struct cfg80211_beacon_data {
        const u8 *head, *tail;
        const u8 *beacon_ies;
        const u8 *proberesp_ies;
        const u8 *assocresp_ies;
        const u8 *probe_resp;

        size_t head_len, tail_len;
        size_t beacon_ies_len;
        size_t proberesp_ies_len;
        size_t assocresp_ies_len;
        size_t probe_resp_len;
};

struct mac_address {
        u8 addr[ETH_ALEN];
};

/**
 * struct cfg80211_acl_data - Access control list data
 *
 * @acl_policy: ACL policy to be applied on the station's
 *      entry specified by mac_addr
 * @n_acl_entries: Number of MAC address entries passed
 * @mac_addrs: List of MAC addresses of stations to be used for ACL
 */
struct cfg80211_acl_data {
        enum nl80211_acl_policy acl_policy;
        int n_acl_entries;

        /* Keep it last */
        struct mac_address mac_addrs[];
};

/**
 * struct cfg80211_ap_settings - AP configuration
 *
 * Used to configure an AP interface.
 *
 * @chandef: defines the channel to use
 * @beacon: beacon data
 * @beacon_interval: beacon interval
 * @dtim_period: DTIM period
 * @ssid: SSID to be used in the BSS (note: may be %NULL if not provided from
 *      user space)
 * @ssid_len: length of @ssid
 * @hidden_ssid: whether to hide the SSID in Beacon/Probe Response frames
 * @crypto: crypto settings
 * @privacy: the BSS uses privacy
 * @auth_type: Authentication type (algorithm)
 * @inactivity_timeout: time in seconds to determine station's inactivity.
 * @p2p_ctwindow: P2P CT Window
 * @p2p_opp_ps: P2P opportunistic PS
 * @acl: ACL configuration used by the drivers which has support for
 *      MAC address based access control
 * @radar_required: set if radar detection is required
 */
struct cfg80211_ap_settings {
        struct cfg80211_chan_def chandef;

        struct cfg80211_beacon_data beacon;

        int beacon_interval, dtim_period;
        const u8 *ssid;
        size_t ssid_len;
        enum nl80211_hidden_ssid hidden_ssid;
        struct cfg80211_crypto_settings crypto;
        bool privacy;
        enum nl80211_auth_type auth_type;
        int inactivity_timeout;
        u8 p2p_ctwindow;
        bool p2p_opp_ps;
        const struct cfg80211_acl_data *acl;
        bool radar_required;
};

/**
 * enum station_parameters_apply_mask - station parameter values to apply
 * @STATION_PARAM_APPLY_UAPSD: apply new uAPSD parameters (uapsd_queues, max_sp)
 * @STATION_PARAM_APPLY_CAPABILITY: apply new capability
 * @STATION_PARAM_APPLY_PLINK_STATE: apply new plink state
 *
 * Not all station parameters have in-band "no change" signalling,
 * for those that don't these flags will are used.
 */
enum station_parameters_apply_mask {
        STATION_PARAM_APPLY_UAPSD = BIT(0),
        STATION_PARAM_APPLY_CAPABILITY = BIT(1),
        STATION_PARAM_APPLY_PLINK_STATE = BIT(2),
};

/**
 * struct station_parameters - station parameters
 *
 * Used to change and create a new station.
 *
 * @vlan: vlan interface station should belong to
 * @supported_rates: supported rates in IEEE 802.11 format
 *      (or NULL for no change)
 * @supported_rates_len: number of supported rates
 * @sta_flags_mask: station flags that changed
 *      (bitmask of BIT(NL80211_STA_FLAG_...))
 * @sta_flags_set: station flags values
 *      (bitmask of BIT(NL80211_STA_FLAG_...))
 * @listen_interval: listen interval or -1 for no change
 * @aid: AID or zero for no change
 * @plink_action: plink action to take
 * @plink_state: set the peer link state for a station
 * @ht_capa: HT capabilities of station
 * @vht_capa: VHT capabilities of station
 * @uapsd_queues: bitmap of queues configured for uapsd. same format
 *      as the AC bitmap in the QoS info field
 * @max_sp: max Service Period. same format as the MAX_SP in the
 *      QoS info field (but already shifted down)
 * @sta_modify_mask: bitmap indicating which parameters changed
 *      (for those that don't have a natural "no change" value),
 *      see &enum station_parameters_apply_mask
 * @local_pm: local link-specific mesh power save mode (no change when set
 *      to unknown)
 * @capability: station capability
 * @ext_capab: extended capabilities of the station
 * @ext_capab_len: number of extended capabilities
 */
struct station_parameters {
        const u8 *supported_rates;
        struct net_device *vlan;
        u32 sta_flags_mask, sta_flags_set;
        u32 sta_modify_mask;
        int listen_interval;
        u16 aid;
        u8 supported_rates_len;
        u8 plink_action;
        u8 plink_state;
        const struct ieee80211_ht_cap *ht_capa;
        const struct ieee80211_vht_cap *vht_capa;
        u8 uapsd_queues;
        u8 max_sp;
        enum nl80211_mesh_power_mode local_pm;
        u16 capability;
        const u8 *ext_capab;
        u8 ext_capab_len;
};

/**
 * enum cfg80211_station_type - the type of station being modified
 * @CFG80211_STA_AP_CLIENT: client of an AP interface
 * @CFG80211_STA_AP_MLME_CLIENT: client of an AP interface that has
 *      the AP MLME in the device
 * @CFG80211_STA_AP_STA: AP station on managed interface
 * @CFG80211_STA_IBSS: IBSS station
 * @CFG80211_STA_TDLS_PEER_SETUP: TDLS peer on managed interface (dummy entry
 *      while TDLS setup is in progress, it moves out of this state when
 *      being marked authorized; use this only if TDLS with external setup is
 *      supported/used)
 * @CFG80211_STA_TDLS_PEER_ACTIVE: TDLS peer on managed interface (active
 *      entry that is operating, has been marked authorized by userspace)
 * @CFG80211_STA_MESH_PEER_KERNEL: peer on mesh interface (kernel managed)
 * @CFG80211_STA_MESH_PEER_USER: peer on mesh interface (user managed)
 */
enum cfg80211_station_type {
        CFG80211_STA_AP_CLIENT,
        CFG80211_STA_AP_MLME_CLIENT,
        CFG80211_STA_AP_STA,
        CFG80211_STA_IBSS,
        CFG80211_STA_TDLS_PEER_SETUP,
        CFG80211_STA_TDLS_PEER_ACTIVE,
        CFG80211_STA_MESH_PEER_KERNEL,
        CFG80211_STA_MESH_PEER_USER,
};

/**
 * cfg80211_check_station_change - validate parameter changes
 * @wiphy: the wiphy this operates on
 * @params: the new parameters for a station
 * @statype: the type of station being modified
 *
 * Utility function for the @change_station driver method. Call this function
 * with the appropriate station type looking up the station (and checking that
 * it exists). It will verify whether the station change is acceptable, and if
 * not will return an error code. Note that it may modify the parameters for
 * backward compatibility reasons, so don't use them before calling this.
 */
int cfg80211_check_station_change(struct wiphy *wiphy,
                                  struct station_parameters *params,
                                  enum cfg80211_station_type statype);

/**
 * enum station_info_flags - station information flags
 *
 * Used by the driver to indicate which info in &struct station_info
 * it has filled in during get_station() or dump_station().
 *
 * @STATION_INFO_INACTIVE_TIME: @inactive_time filled
 * @STATION_INFO_RX_BYTES: @rx_bytes filled
 * @STATION_INFO_TX_BYTES: @tx_bytes filled
 * @STATION_INFO_RX_BYTES64: @rx_bytes filled with 64-bit value
 * @STATION_INFO_TX_BYTES64: @tx_bytes filled with 64-bit value
 * @STATION_INFO_LLID: @llid filled
 * @STATION_INFO_PLID: @plid filled
 * @STATION_INFO_PLINK_STATE: @plink_state filled
 * @STATION_INFO_SIGNAL: @signal filled
 * @STATION_INFO_TX_BITRATE: @txrate fields are filled
 *  (tx_bitrate, tx_bitrate_flags and tx_bitrate_mcs)
 * @STATION_INFO_RX_PACKETS: @rx_packets filled with 32-bit value
 * @STATION_INFO_TX_PACKETS: @tx_packets filled with 32-bit value
 * @STATION_INFO_TX_RETRIES: @tx_retries filled
 * @STATION_INFO_TX_FAILED: @tx_failed filled
 * @STATION_INFO_RX_DROP_MISC: @rx_dropped_misc filled
 * @STATION_INFO_SIGNAL_AVG: @signal_avg filled
 * @STATION_INFO_RX_BITRATE: @rxrate fields are filled
 * @STATION_INFO_BSS_PARAM: @bss_param filled
 * @STATION_INFO_CONNECTED_TIME: @connected_time filled
 * @STATION_INFO_ASSOC_REQ_IES: @assoc_req_ies filled
 * @STATION_INFO_STA_FLAGS: @sta_flags filled
 * @STATION_INFO_BEACON_LOSS_COUNT: @beacon_loss_count filled
 * @STATION_INFO_T_OFFSET: @t_offset filled
 * @STATION_INFO_LOCAL_PM: @local_pm filled
 * @STATION_INFO_PEER_PM: @peer_pm filled
 * @STATION_INFO_NONPEER_PM: @nonpeer_pm filled
 * @STATION_INFO_CHAIN_SIGNAL: @chain_signal filled
 * @STATION_INFO_CHAIN_SIGNAL_AVG: @chain_signal_avg filled
 */
enum station_info_flags {
        STATION_INFO_INACTIVE_TIME      = 1<<0,
        STATION_INFO_RX_BYTES           = 1<<1,
        STATION_INFO_TX_BYTES           = 1<<2,
        STATION_INFO_LLID               = 1<<3,
        STATION_INFO_PLID               = 1<<4,
        STATION_INFO_PLINK_STATE        = 1<<5,
        STATION_INFO_SIGNAL             = 1<<6,
        STATION_INFO_TX_BITRATE         = 1<<7,
        STATION_INFO_RX_PACKETS         = 1<<8,
        STATION_INFO_TX_PACKETS         = 1<<9,
        STATION_INFO_TX_RETRIES         = 1<<10,
        STATION_INFO_TX_FAILED          = 1<<11,
        STATION_INFO_RX_DROP_MISC       = 1<<12,
        STATION_INFO_SIGNAL_AVG         = 1<<13,
        STATION_INFO_RX_BITRATE         = 1<<14,
        STATION_INFO_BSS_PARAM          = 1<<15,
        STATION_INFO_CONNECTED_TIME     = 1<<16,
        STATION_INFO_ASSOC_REQ_IES      = 1<<17,
        STATION_INFO_STA_FLAGS          = 1<<18,
        STATION_INFO_BEACON_LOSS_COUNT  = 1<<19,
        STATION_INFO_T_OFFSET           = 1<<20,
        STATION_INFO_LOCAL_PM           = 1<<21,
        STATION_INFO_PEER_PM            = 1<<22,
        STATION_INFO_NONPEER_PM         = 1<<23,
        STATION_INFO_RX_BYTES64         = 1<<24,
        STATION_INFO_TX_BYTES64         = 1<<25,
        STATION_INFO_CHAIN_SIGNAL       = 1<<26,
        STATION_INFO_CHAIN_SIGNAL_AVG   = 1<<27,
};

/**
 * enum station_info_rate_flags - bitrate info flags
 *
 * Used by the driver to indicate the specific rate transmission
 * type for 802.11n transmissions.
 *
 * @RATE_INFO_FLAGS_MCS: mcs field filled with HT MCS
 * @RATE_INFO_FLAGS_VHT_MCS: mcs field filled with VHT MCS
 * @RATE_INFO_FLAGS_40_MHZ_WIDTH: 40 MHz width transmission
 * @RATE_INFO_FLAGS_80_MHZ_WIDTH: 80 MHz width transmission
 * @RATE_INFO_FLAGS_80P80_MHZ_WIDTH: 80+80 MHz width transmission
 * @RATE_INFO_FLAGS_160_MHZ_WIDTH: 160 MHz width transmission
 * @RATE_INFO_FLAGS_SHORT_GI: 400ns guard interval
 * @RATE_INFO_FLAGS_60G: 60GHz MCS
 */
enum rate_info_flags {
        RATE_INFO_FLAGS_MCS                     = BIT(0),
        RATE_INFO_FLAGS_VHT_MCS                 = BIT(1),
        RATE_INFO_FLAGS_40_MHZ_WIDTH            = BIT(2),
        RATE_INFO_FLAGS_80_MHZ_WIDTH            = BIT(3),
        RATE_INFO_FLAGS_80P80_MHZ_WIDTH         = BIT(4),
        RATE_INFO_FLAGS_160_MHZ_WIDTH           = BIT(5),
        RATE_INFO_FLAGS_SHORT_GI                = BIT(6),
        RATE_INFO_FLAGS_60G                     = BIT(7),
};

/**
 * struct rate_info - bitrate information
 *
 * Information about a receiving or transmitting bitrate
 *
 * @flags: bitflag of flags from &enum rate_info_flags
 * @mcs: mcs index if struct describes a 802.11n bitrate
 * @legacy: bitrate in 100kbit/s for 802.11abg
 * @nss: number of streams (VHT only)
 */
struct rate_info {
        u8 flags;
        u8 mcs;
        u16 legacy;
        u8 nss;
};

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

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

#define IEEE80211_MAX_CHAINS    4

/**
 * struct station_info - station information
 *
 * Station information filled by driver for get_station() and dump_station.
 *
 * @filled: bitflag of flags from &enum station_info_flags
 * @connected_time: time(in secs) since a station is last connected
 * @inactive_time: time since last station activity (tx/rx) in milliseconds
 * @rx_bytes: bytes received from this station
 * @tx_bytes: bytes transmitted to this station
 * @llid: mesh local link id
 * @plid: mesh peer link id
 * @plink_state: mesh peer link state
 * @signal: The signal strength, type depends on the wiphy's signal_type.
 *      For CFG80211_SIGNAL_TYPE_MBM, value is expressed in _dBm_.
 * @signal_avg: Average signal strength, type depends on the wiphy's signal_type.
 *      For CFG80211_SIGNAL_TYPE_MBM, value is expressed in _dBm_.
 * @chains: bitmask for filled values in @chain_signal, @chain_signal_avg
 * @chain_signal: per-chain signal strength of last received packet in dBm
 * @chain_signal_avg: per-chain signal strength average in dBm
 * @txrate: current unicast bitrate from this station
 * @rxrate: current unicast bitrate to this station
 * @rx_packets: packets received from this station
 * @tx_packets: packets transmitted to this station
 * @tx_retries: cumulative retry counts
 * @tx_failed: number of failed transmissions (retries exceeded, no ACK)
 * @rx_dropped_misc:  Dropped for un-specified reason.
 * @bss_param: current BSS parameters
 * @generation: generation number for nl80211 dumps.
 *      This number should increase every time the list of stations
 *      changes, i.e. when a station is added or removed, so that
 *      userspace can tell whether it got a consistent snapshot.
 * @assoc_req_ies: IEs from (Re)Association Request.
 *      This is used only when in AP mode with drivers that do not use
 *      user space MLME/SME implementation. The information is provided for
 *      the cfg80211_new_sta() calls to notify user space of the IEs.
 * @assoc_req_ies_len: Length of assoc_req_ies buffer in octets.
 * @sta_flags: station flags mask & values
 * @beacon_loss_count: Number of times beacon loss event has triggered.
 * @t_offset: Time offset of the station relative to this host.
 * @local_pm: local mesh STA power save mode
 * @peer_pm: peer mesh STA power save mode
 * @nonpeer_pm: non-peer mesh STA power save mode
 */
struct station_info {
        u32 filled;
        u32 connected_time;
        u32 inactive_time;
        u64 rx_bytes;
        u64 tx_bytes;
        u16 llid;
        u16 plid;
        u8 plink_state;
        s8 signal;
        s8 signal_avg;

        u8 chains;
        s8 chain_signal[IEEE80211_MAX_CHAINS];
        s8 chain_signal_avg[IEEE80211_MAX_CHAINS];

        struct rate_info txrate;
        struct rate_info rxrate;
        u32 rx_packets;
        u32 tx_packets;
        u32 tx_retries;
        u32 tx_failed;
        u32 rx_dropped_misc;
        struct sta_bss_parameters bss_param;
        struct nl80211_sta_flag_update sta_flags;

        int generation;

        const u8 *assoc_req_ies;
        size_t assoc_req_ies_len;

        u32 beacon_loss_count;
        s64 t_offset;
        enum nl80211_mesh_power_mode local_pm;
        enum nl80211_mesh_power_mode peer_pm;
        enum nl80211_mesh_power_mode nonpeer_pm;

        /*
         * Note: Add a new enum station_info_flags value for each new field and
         * use it to check which fields are initialized.
         */
};

/**
 * enum monitor_flags - monitor flags
 *
 * Monitor interface configuration flags. Note that these must be the bits
 * according to the nl80211 flags.
 *
 * @MONITOR_FLAG_FCSFAIL: pass frames with bad FCS
 * @MONITOR_FLAG_PLCPFAIL: pass frames with bad PLCP
 * @MONITOR_FLAG_CONTROL: pass control frames
 * @MONITOR_FLAG_OTHER_BSS: disable BSSID filtering
 * @MONITOR_FLAG_COOK_FRAMES: report frames after processing
 * @MONITOR_FLAG_ACTIVE: active monitor, ACKs frames on its MAC address
 */
enum monitor_flags {
        MONITOR_FLAG_FCSFAIL            = 1<<NL80211_MNTR_FLAG_FCSFAIL,
        MONITOR_FLAG_PLCPFAIL           = 1<<NL80211_MNTR_FLAG_PLCPFAIL,
        MONITOR_FLAG_CONTROL            = 1<<NL80211_MNTR_FLAG_CONTROL,
        MONITOR_FLAG_OTHER_BSS          = 1<<NL80211_MNTR_FLAG_OTHER_BSS,
        MONITOR_FLAG_COOK_FRAMES        = 1<<NL80211_MNTR_FLAG_COOK_FRAMES,
        MONITOR_FLAG_ACTIVE             = 1<<NL80211_MNTR_FLAG_ACTIVE,
};

/**
 * enum mpath_info_flags -  mesh path information flags
 *
 * Used by the driver to indicate which info in &struct mpath_info it has filled
 * in during get_station() or dump_station().
 *
 * @MPATH_INFO_FRAME_QLEN: @frame_qlen filled
 * @MPATH_INFO_SN: @sn filled
 * @MPATH_INFO_METRIC: @metric filled
 * @MPATH_INFO_EXPTIME: @exptime filled
 * @MPATH_INFO_DISCOVERY_TIMEOUT: @discovery_timeout filled
 * @MPATH_INFO_DISCOVERY_RETRIES: @discovery_retries filled
 * @MPATH_INFO_FLAGS: @flags filled
 */
enum mpath_info_flags {
        MPATH_INFO_FRAME_QLEN           = BIT(0),
        MPATH_INFO_SN                   = BIT(1),
        MPATH_INFO_METRIC               = BIT(2),
        MPATH_INFO_EXPTIME              = BIT(3),
        MPATH_INFO_DISCOVERY_TIMEOUT    = BIT(4),
        MPATH_INFO_DISCOVERY_RETRIES    = BIT(5),
        MPATH_INFO_FLAGS                = BIT(6),
};

/**
 * struct mpath_info - mesh path information
 *
 * Mesh path information filled by driver for get_mpath() and dump_mpath().
 *
 * @filled: bitfield of flags from &enum mpath_info_flags
 * @frame_qlen: number of queued frames for this destination
 * @sn: target sequence number
 * @metric: metric (cost) of this mesh path
 * @exptime: expiration time for the mesh path from now, in msecs
 * @flags: mesh path flags
 * @discovery_timeout: total mesh path discovery timeout, in msecs
 * @discovery_retries: mesh path discovery retries
 * @generation: generation number for nl80211 dumps.
 *      This number should increase every time the list of mesh paths
 *      changes, i.e. when a station is added or removed, so that
 *      userspace can tell whether it got a consistent snapshot.
 */
struct mpath_info {
        u32 filled;
        u32 frame_qlen;
        u32 sn;
        u32 metric;
        u32 exptime;
        u32 discovery_timeout;
        u8 discovery_retries;
        u8 flags;

        int generation;
};

/**
 * struct bss_parameters - BSS parameters
 *
 * Used to change BSS parameters (mainly for AP mode).
 *
 * @use_cts_prot: Whether to use CTS protection
 *      (0 = no, 1 = yes, -1 = do not change)
 * @use_short_preamble: Whether the use of short preambles is allowed
 *      (0 = no, 1 = yes, -1 = do not change)
 * @use_short_slot_time: Whether the use of short slot time is allowed
 *      (0 = no, 1 = yes, -1 = do not change)
 * @basic_rates: basic rates in IEEE 802.11 format
 *      (or NULL for no change)
 * @basic_rates_len: number of basic rates
 * @ap_isolate: do not forward packets between connected stations
 * @ht_opmode: HT Operation mode
 *      (u16 = opmode, -1 = do not change)
 * @p2p_ctwindow: P2P CT Window (-1 = no change)
 * @p2p_opp_ps: P2P opportunistic PS (-1 = no change)
 */
struct bss_parameters {
        int use_cts_prot;
        int use_short_preamble;
        int use_short_slot_time;
        u8 *basic_rates;
        u8 basic_rates_len;
        int ap_isolate;
        int ht_opmode;
        s8 p2p_ctwindow, p2p_opp_ps;
};

/**
 * struct mesh_config - 802.11s mesh configuration
 *
 * These parameters can be changed while the mesh is active.
 *
 * @dot11MeshRetryTimeout: the initial retry timeout in millisecond units used
 *      by the Mesh Peering Open message
 * @dot11MeshConfirmTimeout: the initial retry timeout in millisecond units
 *      used by the Mesh Peering Open message
 * @dot11MeshHoldingTimeout: the confirm timeout in millisecond units used by
 *      the mesh peering management to close a mesh peering
 * @dot11MeshMaxPeerLinks: the maximum number of peer links allowed on this
 *      mesh interface
 * @dot11MeshMaxRetries: the maximum number of peer link open retries that can
 *      be sent to establish a new peer link instance in a mesh
 * @dot11MeshTTL: the value of TTL field set at a source mesh STA
 * @element_ttl: the value of TTL field set at a mesh STA for path selection
 *      elements
 * @auto_open_plinks: whether we should automatically open peer links when we
 *      detect compatible mesh peers
 * @dot11MeshNbrOffsetMaxNeighbor: the maximum number of neighbors to
 *      synchronize to for 11s default synchronization method
 * @dot11MeshHWMPmaxPREQretries: the number of action frames containing a PREQ
 *      that an originator mesh STA can send to a particular path target
 * @path_refresh_time: how frequently to refresh mesh paths in milliseconds
 * @min_discovery_timeout: the minimum length of time to wait until giving up on
 *      a path discovery in milliseconds
 * @dot11MeshHWMPactivePathTimeout: the time (in TUs) for which mesh STAs
 *      receiving a PREQ shall consider the forwarding information from the
 *      root to be valid. (TU = time unit)
 * @dot11MeshHWMPpreqMinInterval: the minimum interval of time (in TUs) during
 *      which a mesh STA can send only one action frame containing a PREQ
 *      element
 * @dot11MeshHWMPperrMinInterval: the minimum interval of time (in TUs) during
 *      which a mesh STA can send only one Action frame containing a PERR
 *      element
 * @dot11MeshHWMPnetDiameterTraversalTime: the interval of time (in TUs) that
 *      it takes for an HWMP information element to propagate across the mesh
 * @dot11MeshHWMPRootMode: the configuration of a mesh STA as root mesh STA
 * @dot11MeshHWMPRannInterval: the interval of time (in TUs) between root
 *      announcements are transmitted
 * @dot11MeshGateAnnouncementProtocol: whether to advertise that this mesh
 *      station has access to a broader network beyond the MBSS. (This is
 *      missnamed in draft 12.0: dot11MeshGateAnnouncementProtocol set to true
 *      only means that the station will announce others it's a mesh gate, but
 *      not necessarily using the gate announcement protocol. Still keeping the
 *      same nomenclature to be in sync with the spec)
 * @dot11MeshForwarding: whether the Mesh STA is forwarding or non-forwarding
 *      entity (default is TRUE - forwarding entity)
 * @rssi_threshold: the threshold for average signal strength of candidate
 *      station to establish a peer link
 * @ht_opmode: mesh HT protection mode
 *
 * @dot11MeshHWMPactivePathToRootTimeout: The time (in TUs) for which mesh STAs
 *      receiving a proactive PREQ shall consider the forwarding information to
 *      the root mesh STA to be valid.
 *
 * @dot11MeshHWMProotInterval: The interval of time (in TUs) between proactive
 *      PREQs are transmitted.
 * @dot11MeshHWMPconfirmationInterval: The minimum interval of time (in TUs)
 *      during which a mesh STA can send only one Action frame containing
 *      a PREQ element for root path confirmation.
 * @power_mode: The default mesh power save mode which will be the initial
 *      setting for new peer links.
 * @dot11MeshAwakeWindowDuration: The duration in TUs the STA will remain awake
 *      after transmitting its beacon.
 * @plink_timeout: If no tx activity is seen from a STA we've established
 *      peering with for longer than this time (in seconds), then remove it
 *      from the STA's list of peers.  Default is 30 minutes.
 */
struct mesh_config {
        u16 dot11MeshRetryTimeout;
        u16 dot11MeshConfirmTimeout;
        u16 dot11MeshHoldingTimeout;
        u16 dot11MeshMaxPeerLinks;
        u8 dot11MeshMaxRetries;
        u8 dot11MeshTTL;
        u8 element_ttl;
        bool auto_open_plinks;
        u32 dot11MeshNbrOffsetMaxNeighbor;
        u8 dot11MeshHWMPmaxPREQretries;
        u32 path_refresh_time;
        u16 min_discovery_timeout;
        u32 dot11MeshHWMPactivePathTimeout;
        u16 dot11MeshHWMPpreqMinInterval;
        u16 dot11MeshHWMPperrMinInterval;
        u16 dot11MeshHWMPnetDiameterTraversalTime;
        u8 dot11MeshHWMPRootMode;
        u16 dot11MeshHWMPRannInterval;
        bool dot11MeshGateAnnouncementProtocol;
        bool dot11MeshForwarding;
        s32 rssi_threshold;
        u16 ht_opmode;
        u32 dot11MeshHWMPactivePathToRootTimeout;
        u16 dot11MeshHWMProotInterval;
        u16 dot11MeshHWMPconfirmationInterval;
        enum nl80211_mesh_power_mode power_mode;
        u16 dot11MeshAwakeWindowDuration;
        u32 plink_timeout;
};

/**
 * struct mesh_setup - 802.11s mesh setup configuration
 * @chandef: defines the channel to use
 * @mesh_id: the mesh ID
 * @mesh_id_len: length of the mesh ID, at least 1 and at most 32 bytes
 * @sync_method: which synchronization method to use
 * @path_sel_proto: which path selection protocol to use
 * @path_metric: which metric to use
 * @auth_id: which authentication method this mesh is using
 * @ie: vendor information elements (optional)
 * @ie_len: length of vendor information elements
 * @is_authenticated: this mesh requires authentication
 * @is_secure: this mesh uses security
 * @user_mpm: userspace handles all MPM functions
 * @dtim_period: DTIM period to use
 * @beacon_interval: beacon interval to use
 * @mcast_rate: multicat rate for Mesh Node [6Mbps is the default for 802.11a]
 * @basic_rates: basic rates to use when creating the mesh
 *
 * These parameters are fixed when the mesh is created.
 */
struct mesh_setup {
        struct cfg80211_chan_def chandef;
        const u8 *mesh_id;
        u8 mesh_id_len;
        u8 sync_method;
        u8 path_sel_proto;
        u8 path_metric;
        u8 auth_id;
        const u8 *ie;
        u8 ie_len;
        bool is_authenticated;
        bool is_secure;
        bool user_mpm;
        u8 dtim_period;
        u16 beacon_interval;
        int mcast_rate[IEEE80211_NUM_BANDS];
        u32 basic_rates;
};

/**
 * struct ieee80211_txq_params - TX queue parameters
 * @ac: AC identifier
 * @txop: Maximum burst time in units of 32 usecs, 0 meaning disabled
 * @cwmin: Minimum contention window [a value of the form 2^n-1 in the range
 *      1..32767]
 * @cwmax: Maximum contention window [a value of the form 2^n-1 in the range
 *      1..32767]
 * @aifs: Arbitration interframe space [0..255]
 */
struct ieee80211_txq_params {
        enum nl80211_ac ac;
        u16 txop;
        u16 cwmin;
        u16 cwmax;
        u8 aifs;
};

/**
 * DOC: Scanning and BSS list handling
 *
 * The scanning process itself is fairly simple, but cfg80211 offers quite
 * a bit of helper functionality. To start a scan, the scan operation will
 * be invoked with a scan definition. This scan definition contains the
 * channels to scan, and the SSIDs to send probe requests for (including the
 * wildcard, if desired). A passive scan is indicated by having no SSIDs to
 * probe. Additionally, a scan request may contain extra information elements
 * that should be added to the probe request. The IEs are guaranteed to be
 * well-formed, and will not exceed the maximum length the driver advertised
 * in the wiphy structure.
 *
 * When scanning finds a BSS, cfg80211 needs to be notified of that, because
 * it is responsible for maintaining the BSS list; the driver should not
 * maintain a list itself. For this notification, various functions exist.
 *
 * Since drivers do not maintain a BSS list, there are also a number of
 * functions to search for a BSS and obtain information about it from the
 * BSS structure cfg80211 maintains. The BSS list is also made available
 * to userspace.
 */

/**
 * struct cfg80211_ssid - SSID description
 * @ssid: the SSID
 * @ssid_len: length of the ssid
 */
struct cfg80211_ssid {
        u8 ssid[IEEE80211_MAX_SSID_LEN];
        u8 ssid_len;
};

/**
 * struct cfg80211_scan_request - scan request description
 *
 * @ssids: SSIDs to scan for (active scan only)
 * @n_ssids: number of SSIDs
 * @channels: channels to scan on.
 * @n_channels: total number of channels to scan
 * @ie: optional information element(s) to add into Probe Request or %NULL
 * @ie_len: length of ie in octets
 * @flags: bit field of flags controlling operation
 * @rates: bitmap of rates to advertise for each band
 * @wiphy: the wiphy this was for
 * @scan_start: time (in jiffies) when the scan started
 * @wdev: the wireless device to scan for
 * @aborted: (internal) scan request was notified as aborted
 * @notified: (internal) scan request was notified as done or aborted
 * @no_cck: used to send probe requests at non CCK rate in 2GHz band
 */
struct cfg80211_scan_request {
        struct cfg80211_ssid *ssids;
        int n_ssids;
        u32 n_channels;
        const u8 *ie;
        size_t ie_len;
        u32 flags;

        u32 rates[IEEE80211_NUM_BANDS];

        struct wireless_dev *wdev;

        /* internal */
        struct wiphy *wiphy;
        unsigned long scan_start;
        bool aborted, notified;
        bool no_cck;

        /* keep last */
        struct ieee80211_channel *channels[0];
};

/**
 * struct cfg80211_match_set - sets of attributes to match
 *
 * @ssid: SSID to be matched
 */
struct cfg80211_match_set {
        struct cfg80211_ssid ssid;
};

/**
 * struct cfg80211_sched_scan_request - scheduled scan request description
 *
 * @ssids: SSIDs to scan for (passed in the probe_reqs in active scans)
 * @n_ssids: number of SSIDs
 * @n_channels: total number of channels to scan
 * @interval: interval between each scheduled scan cycle
 * @ie: optional information element(s) to add into Probe Request or %NULL
 * @ie_len: length of ie in octets
 * @flags: bit field of flags controlling operation
 * @match_sets: sets of parameters to be matched for a scan result
 *      entry to be considered valid and to be passed to the host
 *      (others are filtered out).
 *      If ommited, all results are passed.
 * @n_match_sets: number of match sets
 * @wiphy: the wiphy this was for
 * @dev: the interface
 * @scan_start: start time of the scheduled scan
 * @channels: channels to scan
 * @rssi_thold: don't report scan results below this threshold (in s32 dBm)
 */
struct cfg80211_sched_scan_request {
        struct cfg80211_ssid *ssids;
        int n_ssids;
        u32 n_channels;
        u32 interval;
        const u8 *ie;
        size_t ie_len;
        u32 flags;
        struct cfg80211_match_set *match_sets;
        int n_match_sets;
        s32 rssi_thold;

        /* internal */
        struct wiphy *wiphy;
        struct net_device *dev;
        unsigned long scan_start;

        /* keep last */
        struct ieee80211_channel *channels[0];
};

/**
 * enum cfg80211_signal_type - signal type
 *
 * @CFG80211_SIGNAL_TYPE_NONE: no signal strength information available
 * @CFG80211_SIGNAL_TYPE_MBM: signal strength in mBm (100*dBm)
 * @CFG80211_SIGNAL_TYPE_UNSPEC: signal strength, increasing from 0 through 100
 */
enum cfg80211_signal_type {
        CFG80211_SIGNAL_TYPE_NONE,
        CFG80211_SIGNAL_TYPE_MBM,
        CFG80211_SIGNAL_TYPE_UNSPEC,
};

/**
 * struct cfg80211_bss_ie_data - BSS entry IE data
 * @tsf: TSF contained in the frame that carried these IEs
 * @rcu_head: internal use, for freeing
 * @len: length of the IEs
 * @data: IE data
 */
struct cfg80211_bss_ies {
        u64 tsf;
        struct rcu_head rcu_head;
        int len;
        u8 data[];
};

/**
 * struct cfg80211_bss - BSS description
 *
 * This structure describes a BSS (which may also be a mesh network)
 * for use in scan results and similar.
 *
 * @channel: channel this BSS is on
 * @bssid: BSSID of the BSS
 * @beacon_interval: the beacon interval as from the frame
 * @capability: the capability field in host byte order
 * @ies: the information elements (Note that there is no guarantee that these
 *      are well-formed!); this is a pointer to either the beacon_ies or
 *      proberesp_ies depending on whether Probe Response frame has been
 *      received. It is always non-%NULL.
 * @beacon_ies: the information elements from the last Beacon frame
 *      (implementation note: if @hidden_beacon_bss is set this struct doesn't
 *      own the beacon_ies, but they're just pointers to the ones from the
 *      @hidden_beacon_bss struct)
 * @proberesp_ies: the information elements from the last Probe Response frame
 * @hidden_beacon_bss: in case this BSS struct represents a probe response from
 *      a BSS that hides the SSID in its beacon, this points to the BSS struct
 *      that holds the beacon data. @beacon_ies is still valid, of course, and
 *      points to the same data as hidden_beacon_bss->beacon_ies in that case.
 * @signal: signal strength value (type depends on the wiphy's signal_type)
 * @priv: private area for driver use, has at least wiphy->bss_priv_size bytes
 */
struct cfg80211_bss {
        struct ieee80211_channel *channel;

        const struct cfg80211_bss_ies __rcu *ies;
        const struct cfg80211_bss_ies __rcu *beacon_ies;
        const struct cfg80211_bss_ies __rcu *proberesp_ies;

        struct cfg80211_bss *hidden_beacon_bss;

        s32 signal;

        u16 beacon_interval;
        u16 capability;

        u8 bssid[ETH_ALEN];

        u8 priv[0] __aligned(sizeof(void *));
};

/**
 * ieee80211_bss_get_ie - find IE with given ID
 * @bss: the bss to search
 * @ie: the IE ID
 *
 * Note that the return value is an RCU-protected pointer, so
 * rcu_read_lock() must be held when calling this function.
 * Return: %NULL if not found.
 */
const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie);


/**
 * struct cfg80211_auth_request - Authentication request data
 *
 * This structure provides information needed to complete IEEE 802.11
 * authentication.
 *
 * @bss: The BSS to authenticate with, the callee must obtain a reference
 *      to it if it needs to keep it.
 * @auth_type: Authentication type (algorithm)
 * @ie: Extra IEs to add to Authentication frame or %NULL
 * @ie_len: Length of ie buffer in octets
 * @key_len: length of WEP key for shared key authentication
 * @key_idx: index of WEP key for shared key authentication
 * @key: WEP key for shared key authentication
 * @sae_data: Non-IE data to use with SAE or %NULL. This starts with
 *      Authentication transaction sequence number field.
 * @sae_data_len: Length of sae_data buffer in octets
 */
struct cfg80211_auth_request {
        struct cfg80211_bss *bss;
        const u8 *ie;
        size_t ie_len;
        enum nl80211_auth_type auth_type;
        const u8 *key;
        u8 key_len, key_idx;
        const u8 *sae_data;
        size_t sae_data_len;
};

/**
 * enum cfg80211_assoc_req_flags - Over-ride default behaviour in association.
 *
 * @ASSOC_REQ_DISABLE_HT:  Disable HT (802.11n)
 * @ASSOC_REQ_DISABLE_VHT:  Disable VHT
 */
enum cfg80211_assoc_req_flags {
        ASSOC_REQ_DISABLE_HT            = BIT(0),
        ASSOC_REQ_DISABLE_VHT           = BIT(1),
};

/**
 * struct cfg80211_assoc_request - (Re)Association request data
 *
 * This structure provides information needed to complete IEEE 802.11
 * (re)association.
 * @bss: The BSS to associate with. If the call is successful the driver is
 *      given a reference that it must give back to cfg80211_send_rx_assoc()
 *      or to cfg80211_assoc_timeout(). To ensure proper refcounting, new
 *      association requests while already associating must be rejected.
 * @ie: Extra IEs to add to (Re)Association Request frame or %NULL
 * @ie_len: Length of ie buffer in octets
 * @use_mfp: Use management frame protection (IEEE 802.11w) in this association
 * @crypto: crypto settings
 * @prev_bssid: previous BSSID, if not %NULL use reassociate frame
 * @flags:  See &enum cfg80211_assoc_req_flags
 * @ht_capa:  HT Capabilities over-rides.  Values set in ht_capa_mask
 *   will be used in ht_capa.  Un-supported values will be ignored.
 * @ht_capa_mask:  The bits of ht_capa which are to be used.
 * @vht_capa: VHT capability override
 * @vht_capa_mask: VHT capability mask indicating which fields to use
 */
struct cfg80211_assoc_request {
        struct cfg80211_bss *bss;
        const u8 *ie, *prev_bssid;
        size_t ie_len;
        struct cfg80211_crypto_settings crypto;
        bool use_mfp;
        u32 flags;
        struct ieee80211_ht_cap ht_capa;
        struct ieee80211_ht_cap ht_capa_mask;
        struct ieee80211_vht_cap vht_capa, vht_capa_mask;
};

/**
 * struct cfg80211_deauth_request - Deauthentication request data
 *
 * This structure provides information needed to complete IEEE 802.11
 * deauthentication.
 *
 * @bssid: the BSSID of the BSS to deauthenticate from
 * @ie: Extra IEs to add to Deauthentication frame or %NULL
 * @ie_len: Length of ie buffer in octets
 * @reason_code: The reason code for the deauthentication
 * @local_state_change: if set, change local state only and
 *      do not set a deauth frame
 */
struct cfg80211_deauth_request {
        const u8 *bssid;
        const u8 *ie;
        size_t ie_len;
        u16 reason_code;
        bool local_state_change;
};

/**
 * struct cfg80211_disassoc_request - Disassociation request data
 *
 * This structure provides information needed to complete IEEE 802.11
 * disassocation.
 *
 * @bss: the BSS to disassociate from
 * @ie: Extra IEs to add to Disassociation frame or %NULL
 * @ie_len: Length of ie buffer in octets
 * @reason_code: The reason code for the disassociation
 * @local_state_change: This is a request for a local state only, i.e., no
 *      Disassociation frame is to be transmitted.
 */
struct cfg80211_disassoc_request {
        struct cfg80211_bss *bss;
        const u8 *ie;
        size_t ie_len;
        u16 reason_code;
        bool local_state_change;
};

/**
 * struct cfg80211_ibss_params - IBSS parameters
 *
 * This structure defines the IBSS parameters for the join_ibss()
 * method.
 *
 * @ssid: The SSID, will always be non-null.
 * @ssid_len: The length of the SSID, will always be non-zero.
 * @bssid: Fixed BSSID requested, maybe be %NULL, if set do not
 *      search for IBSSs with a different BSSID.
 * @chandef: defines the channel to use if no other IBSS to join can be found
 * @channel_fixed: The channel should be fixed -- do not search for
 *      IBSSs to join on other channels.
 * @ie: information element(s) to include in the beacon
 * @ie_len: length of that
 * @beacon_interval: beacon interval to use
 * @privacy: this is a protected network, keys will be configured
 *      after joining
 * @control_port: whether user space controls IEEE 802.1X port, i.e.,
 *      sets/clears %NL80211_STA_FLAG_AUTHORIZED. If true, the driver is
 *      required to assume that the port is unauthorized until authorized by
 *      user space. Otherwise, port is marked authorized by default.
 * @basic_rates: bitmap of basic rates to use when creating the IBSS
 * @mcast_rate: per-band multicast rate index + 1 (0: disabled)
 */
struct cfg80211_ibss_params {
        u8 *ssid;
        u8 *bssid;
        struct cfg80211_chan_def chandef;
        u8 *ie;
        u8 ssid_len, ie_len;
        u16 beacon_interval;
        u32 basic_rates;
        bool channel_fixed;
        bool privacy;
        bool control_port;
        int mcast_rate[IEEE80211_NUM_BANDS];
};

/**
 * struct cfg80211_connect_params - Connection parameters
 *
 * This structure provides information needed to complete IEEE 802.11
 * authentication and association.
 *
 * @channel: The channel to use or %NULL if not specified (auto-select based
 *      on scan results)
 * @bssid: The AP BSSID or %NULL if not specified (auto-select based on scan
 *      results)
 * @ssid: SSID
 * @ssid_len: Length of ssid in octets
 * @auth_type: Authentication type (algorithm)
 * @ie: IEs for association request
 * @ie_len: Length of assoc_ie in octets
 * @privacy: indicates whether privacy-enabled APs should be used
 * @mfp: indicate whether management frame protection is used
 * @crypto: crypto settings
 * @key_len: length of WEP key for shared key authentication
 * @key_idx: index of WEP key for shared key authentication
 * @key: WEP key for shared key authentication
 * @flags:  See &enum cfg80211_assoc_req_flags
 * @bg_scan_period:  Background scan period in seconds
 *   or -1 to indicate that default value is to be used.
 * @ht_capa:  HT Capabilities over-rides.  Values set in ht_capa_mask
 *   will be used in ht_capa.  Un-supported values will be ignored.
 * @ht_capa_mask:  The bits of ht_capa which are to be used.
 * @vht_capa:  VHT Capability overrides
 * @vht_capa_mask: The bits of vht_capa which are to be used.
 */
struct cfg80211_connect_params {
        struct ieee80211_channel *channel;
        u8 *bssid;
        u8 *ssid;
        size_t ssid_len;
        enum nl80211_auth_type auth_type;
        u8 *ie;
        size_t ie_len;
        bool privacy;
        enum nl80211_mfp mfp;
        struct cfg80211_crypto_settings crypto;
        const u8 *key;
        u8 key_len, key_idx;
        u32 flags;
        int bg_scan_period;
        struct ieee80211_ht_cap ht_capa;
        struct ieee80211_ht_cap ht_capa_mask;
        struct ieee80211_vht_cap vht_capa;
        struct ieee80211_vht_cap vht_capa_mask;
};

/**
 * enum wiphy_params_flags - set_wiphy_params bitfield values
 * @WIPHY_PARAM_RETRY_SHORT: wiphy->retry_short has changed
 * @WIPHY_PARAM_RETRY_LONG: wiphy->retry_long has changed
 * @WIPHY_PARAM_FRAG_THRESHOLD: wiphy->frag_threshold has changed
 * @WIPHY_PARAM_RTS_THRESHOLD: wiphy->rts_threshold has changed
 * @WIPHY_PARAM_COVERAGE_CLASS: coverage class changed
 */
enum wiphy_params_flags {
        WIPHY_PARAM_RETRY_SHORT         = 1 << 0,
        WIPHY_PARAM_RETRY_LONG          = 1 << 1,
        WIPHY_PARAM_FRAG_THRESHOLD      = 1 << 2,
        WIPHY_PARAM_RTS_THRESHOLD       = 1 << 3,
        WIPHY_PARAM_COVERAGE_CLASS      = 1 << 4,
};

/*
 * cfg80211_bitrate_mask - masks for bitrate control
 */
struct cfg80211_bitrate_mask {
        struct {
                u32 legacy;
                u8 mcs[IEEE80211_HT_MCS_MASK_LEN];
        } control[IEEE80211_NUM_BANDS];
};
/**
 * struct cfg80211_pmksa - PMK Security Association
 *
 * This structure is passed to the set/del_pmksa() method for PMKSA
 * caching.
 *
 * @bssid: The AP's BSSID.
 * @pmkid: The PMK material itself.
 */
struct cfg80211_pmksa {
        u8 *bssid;
        u8 *pmkid;
};

/**
 * struct cfg80211_wowlan_trig_pkt_pattern - packet pattern
 * @mask: bitmask where to match pattern and where to ignore bytes,
 *      one bit per byte, in same format as nl80211
 * @pattern: bytes to match where bitmask is 1
 * @pattern_len: length of pattern (in bytes)
 * @pkt_offset: packet offset (in bytes)
 *
 * Internal note: @mask and @pattern are allocated in one chunk of
 * memory, free @mask only!
 */
struct cfg80211_wowlan_trig_pkt_pattern {
        u8 *mask, *pattern;
        int pattern_len;
        int pkt_offset;
};

/**
 * struct cfg80211_wowlan_tcp - TCP connection parameters
 *
 * @sock: (internal) socket for source port allocation
 * @src: source IP address
 * @dst: destination IP address
 * @dst_mac: destination MAC address
 * @src_port: source port
 * @dst_port: destination port
 * @payload_len: data payload length
 * @payload: data payload buffer
 * @payload_seq: payload sequence stamping configuration
 * @data_interval: interval at which to send data packets
 * @wake_len: wakeup payload match length
 * @wake_data: wakeup payload match data
 * @wake_mask: wakeup payload match mask
 * @tokens_size: length of the tokens buffer
 * @payload_tok: payload token usage configuration
 */
struct cfg80211_wowlan_tcp {
        struct socket *sock;
        __be32 src, dst;
        u16 src_port, dst_port;
        u8 dst_mac[ETH_ALEN];
        int payload_len;
        const u8 *payload;
        struct nl80211_wowlan_tcp_data_seq payload_seq;
        u32 data_interval;
        u32 wake_len;
        const u8 *wake_data, *wake_mask;
        u32 tokens_size;
        /* must be last, variable member */
        struct nl80211_wowlan_tcp_data_token payload_tok;
};

/**
 * struct cfg80211_wowlan - Wake on Wireless-LAN support info
 *
 * This structure defines the enabled WoWLAN triggers for the device.
 * @any: wake up on any activity -- special trigger if device continues
 *      operating as normal during suspend
 * @disconnect: wake up if getting disconnected
 * @magic_pkt: wake up on receiving magic packet
 * @patterns: wake up on receiving packet matching a pattern
 * @n_patterns: number of patterns
 * @gtk_rekey_failure: wake up on GTK rekey failure
 * @eap_identity_req: wake up on EAP identity request packet
 * @four_way_handshake: wake up on 4-way handshake
 * @rfkill_release: wake up when rfkill is released
 * @tcp: TCP connection establishment/wakeup parameters, see nl80211.h.
 *      NULL if not configured.
 */
struct cfg80211_wowlan {
        bool any, disconnect, magic_pkt, gtk_rekey_failure,
             eap_identity_req, four_way_handshake,
             rfkill_release;
        struct cfg80211_wowlan_trig_pkt_pattern *patterns;
        struct cfg80211_wowlan_tcp *tcp;
        int n_patterns;
};

/**
 * struct cfg80211_wowlan_wakeup - wakeup report
 * @disconnect: woke up by getting disconnected
 * @magic_pkt: woke up by receiving magic packet
 * @gtk_rekey_failure: woke up by GTK rekey failure
 * @eap_identity_req: woke up by EAP identity request packet
 * @four_way_handshake: woke up by 4-way handshake
 * @rfkill_release: woke up by rfkill being released
 * @pattern_idx: pattern that caused wakeup, -1 if not due to pattern
 * @packet_present_len: copied wakeup packet data
 * @packet_len: original wakeup packet length
 * @packet: The packet causing the wakeup, if any.
 * @packet_80211:  For pattern match, magic packet and other data
 *      frame triggers an 802.3 frame should be reported, for
 *      disconnect due to deauth 802.11 frame. This indicates which
 *      it is.
 * @tcp_match: TCP wakeup packet received
 * @tcp_connlost: TCP connection lost or failed to establish
 * @tcp_nomoretokens: TCP data ran out of tokens
 */
struct cfg80211_wowlan_wakeup {
        bool disconnect, magic_pkt, gtk_rekey_failure,
             eap_identity_req, four_way_handshake,
             rfkill_release, packet_80211,
             tcp_match, tcp_connlost, tcp_nomoretokens;
        s32 pattern_idx;
        u32 packet_present_len, packet_len;
        const void *packet;
};

/**
 * struct cfg80211_gtk_rekey_data - rekey data
 * @kek: key encryption key
 * @kck: key confirmation key
 * @replay_ctr: replay counter
 */
struct cfg80211_gtk_rekey_data {
        u8 kek[NL80211_KEK_LEN];
        u8 kck[NL80211_KCK_LEN];
        u8 replay_ctr[NL80211_REPLAY_CTR_LEN];
};

/**
 * struct cfg80211_update_ft_ies_params - FT IE Information
 *
 * This structure provides information needed to update the fast transition IE
 *
 * @md: The Mobility Domain ID, 2 Octet value
 * @ie: Fast Transition IEs
 * @ie_len: Length of ft_ie in octets
 */
struct cfg80211_update_ft_ies_params {
        u16 md;
        const u8 *ie;
        size_t ie_len;
};

/**
 * struct cfg80211_ops - backend description for wireless configuration
 *
 * This struct is registered by fullmac card drivers and/or wireless stacks
 * in order to handle configuration requests on their interfaces.
 *
 * All callbacks except where otherwise noted should return 0
 * on success or a negative error code.
 *
 * All operations are currently invoked under rtnl for consistency with the
 * wireless extensions but this is subject to reevaluation as soon as this
 * code is used more widely and we have a first user without wext.
 *
 * @suspend: wiphy device needs to be suspended. The variable @wow will
 *      be %NULL or contain the enabled Wake-on-Wireless triggers that are
 *      configured for the device.
 * @resume: wiphy device needs to be resumed
 * @set_wakeup: Called when WoWLAN is enabled/disabled, use this callback
 *      to call device_set_wakeup_enable() to enable/disable wakeup from
 *      the device.
 *
 * @add_virtual_intf: create a new virtual interface with the given name,
 *      must set the struct wireless_dev's iftype. Beware: You must create
 *      the new netdev in the wiphy's network namespace! Returns the struct
 *      wireless_dev, or an ERR_PTR. For P2P device wdevs, the driver must
 *      also set the address member in the wdev.
 *
 * @del_virtual_intf: remove the virtual interface
 *
 * @change_virtual_intf: change type/configuration of virtual interface,
 *      keep the struct wireless_dev's iftype updated.
 *
 * @add_key: add a key with the given parameters. @mac_addr will be %NULL
 *      when adding a group key.
 *
 * @get_key: get information about the key with the given parameters.
 *      @mac_addr will be %NULL when requesting information for a group
 *      key. All pointers given to the @callback function need not be valid
 *      after it returns. This function should return an error if it is
 *      not possible to retrieve the key, -ENOENT if it doesn't exist.
 *
 * @del_key: remove a key given the @mac_addr (%NULL for a group key)
 *      and @key_index, return -ENOENT if the key doesn't exist.
 *
 * @set_default_key: set the default key on an interface
 *
 * @set_default_mgmt_key: set the default management frame key on an interface
 *
 * @set_rekey_data: give the data necessary for GTK rekeying to the driver
 *
 * @start_ap: Start acting in AP mode defined by the parameters.
 * @change_beacon: Change the beacon parameters for an access point mode
 *      interface. This should reject the call when AP mode wasn't started.
 * @stop_ap: Stop being an AP, including stopping beaconing.
 *
 * @add_station: Add a new station.
 * @del_station: Remove a station; @mac may be NULL to remove all stations.
 * @change_station: Modify a given station. Note that flags changes are not much
 *      validated in cfg80211, in particular the auth/assoc/authorized flags
 *      might come to the driver in invalid combinations -- make sure to check
 *      them, also against the existing state! Drivers must call
 *      cfg80211_check_station_change() to validate the information.
 * @get_station: get station information for the station identified by @mac
 * @dump_station: dump station callback -- resume dump at index @idx
 *
 * @add_mpath: add a fixed mesh path
 * @del_mpath: delete a given mesh path
 * @change_mpath: change a given mesh path
 * @get_mpath: get a mesh path for the given parameters
 * @dump_mpath: dump mesh path callback -- resume dump at index @idx
 * @join_mesh: join the mesh network with the specified parameters
 *      (invoked with the wireless_dev mutex held)
 * @leave_mesh: leave the current mesh network
 *      (invoked with the wireless_dev mutex held)
 *
 * @get_mesh_config: Get the current mesh configuration
 *
 * @update_mesh_config: Update mesh parameters on a running mesh.
 *      The mask is a bitfield which tells us which parameters to
 *      set, and which to leave alone.
 *
 * @change_bss: Modify parameters for a given BSS.
 *
 * @set_txq_params: Set TX queue parameters
 *
 * @libertas_set_mesh_channel: Only for backward compatibility for libertas,
 *      as it doesn't implement join_mesh and needs to set the channel to
 *      join the mesh instead.
 *
 * @set_monitor_channel: Set the monitor mode channel for the device. If other
 *      interfaces are active this callback should reject the configuration.
 *      If no interfaces are active or the device is down, the channel should
 *      be stored for when a monitor interface becomes active.
 *
 * @scan: Request to do a scan. If returning zero, the scan request is given
 *      the driver, and will be valid until passed to cfg80211_scan_done().
 *      For scan results, call cfg80211_inform_bss(); you can call this outside
 *      the scan/scan_done bracket too.
 *
 * @auth: Request to authenticate with the specified peer
 *      (invoked with the wireless_dev mutex held)
 * @assoc: Request to (re)associate with the specified peer
 *      (invoked with the wireless_dev mutex held)
 * @deauth: Request to deauthenticate from the specified peer
 *      (invoked with the wireless_dev mutex held)
 * @disassoc: Request to disassociate from the specified peer
 *      (invoked with the wireless_dev mutex held)
 *
 * @connect: Connect to the ESS with the specified parameters. When connected,
 *      call cfg80211_connect_result() with status code %WLAN_STATUS_SUCCESS.
 *      If the connection fails for some reason, call cfg80211_connect_result()
 *      with the status from the AP.
 *      (invoked with the wireless_dev mutex held)
 * @disconnect: Disconnect from the BSS/ESS.
 *      (invoked with the wireless_dev mutex held)
 *
 * @join_ibss: Join the specified IBSS (or create if necessary). Once done, call
 *      cfg80211_ibss_joined(), also call that function when changing BSSID due
 *      to a merge.
 *      (invoked with the wireless_dev mutex held)
 * @leave_ibss: Leave the IBSS.
 *      (invoked with the wireless_dev mutex held)
 *
 * @set_mcast_rate: Set the specified multicast rate (only if vif is in ADHOC or
 *      MESH mode)
 *
 * @set_wiphy_params: Notify that wiphy parameters have changed;
 *      @changed bitfield (see &enum wiphy_params_flags) describes which values
 *      have changed. The actual parameter values are available in
 *      struct wiphy. If returning an error, no value should be changed.
 *
 * @set_tx_power: set the transmit power according to the parameters,
 *      the power passed is in mBm, to get dBm use MBM_TO_DBM(). The
 *      wdev may be %NULL if power was set for the wiphy, and will
 *      always be %NULL unless the driver supports per-vif TX power
 *      (as advertised by the nl80211 feature flag.)
 * @get_tx_power: store the current TX power into the dbm variable;
 *      return 0 if successful
 *
 * @set_wds_peer: set the WDS peer for a WDS interface
 *
 * @rfkill_poll: polls the hw rfkill line, use cfg80211 reporting
 *      functions to adjust rfkill hw state
 *
 * @dump_survey: get site survey information.
 *
 * @remain_on_channel: Request the driver to remain awake on the specified
 *      channel for the specified duration to complete an off-channel
 *      operation (e.g., public action frame exchange). When the driver is
 *      ready on the requested channel, it must indicate this with an event
 *      notification by calling cfg80211_ready_on_channel().
 * @cancel_remain_on_channel: Cancel an on-going remain-on-channel operation.
 *      This allows the operation to be terminated prior to timeout based on
 *      the duration value.
 * @mgmt_tx: Transmit a management frame.
 * @mgmt_tx_cancel_wait: Cancel the wait time from transmitting a management
 *      frame on another channel
 *
 * @testmode_cmd: run a test mode command
 * @testmode_dump: Implement a test mode dump. The cb->args[2] and up may be
 *      used by the function, but 0 and 1 must not be touched. Additionally,
 *      return error codes other than -ENOBUFS and -ENOENT will terminate the
 *      dump and return to userspace with an error, so be careful. If any data
 *      was passed in from userspace then the data/len arguments will be present
 *      and point to the data contained in %NL80211_ATTR_TESTDATA.
 *
 * @set_bitrate_mask: set the bitrate mask configuration
 *
 * @set_pmksa: Cache a PMKID for a BSSID. This is mostly useful for fullmac
 *      devices running firmwares capable of generating the (re) association
 *      RSN IE. It allows for faster roaming between WPA2 BSSIDs.
 * @del_pmksa: Delete a cached PMKID.
 * @flush_pmksa: Flush all cached PMKIDs.
 * @set_power_mgmt: Configure WLAN power management. A timeout value of -1
 *      allows the driver to adjust the dynamic ps timeout value.
 * @set_cqm_rssi_config: Configure connection quality monitor RSSI threshold.
 * @set_cqm_txe_config: Configure connection quality monitor TX error
 *      thresholds.
 * @sched_scan_start: Tell the driver to start a scheduled scan.
 * @sched_scan_stop: Tell the driver to stop an ongoing scheduled scan.
 *
 * @mgmt_frame_register: Notify driver that a management frame type was
 *      registered. Note that this callback may not sleep, and cannot run
 *      concurrently with itself.
 *
 * @set_antenna: Set antenna configuration (tx_ant, rx_ant) on the device.
 *      Parameters are bitmaps of allowed antennas to use for TX/RX. Drivers may
 *      reject TX/RX mask combinations they cannot support by returning -EINVAL
 *      (also see nl80211.h @NL80211_ATTR_WIPHY_ANTENNA_TX).
 *
 * @get_antenna: Get current antenna configuration from device (tx_ant, rx_ant).
 *
 * @set_ringparam: Set tx and rx ring sizes.
 *
 * @get_ringparam: Get tx and rx ring current and maximum sizes.
 *
 * @tdls_mgmt: Transmit a TDLS management frame.
 * @tdls_oper: Perform a high-level TDLS operation (e.g. TDLS link setup).
 *
 * @probe_client: probe an associated client, must return a cookie that it
 *      later passes to cfg80211_probe_status().
 *
 * @set_noack_map: Set the NoAck Map for the TIDs.
 *
 * @get_et_sset_count:  Ethtool API to get string-set count.
 *      See @ethtool_ops.get_sset_count
 *
 * @get_et_stats:  Ethtool API to get a set of u64 stats.
 *      See @ethtool_ops.get_ethtool_stats
 *
 * @get_et_strings:  Ethtool API to get a set of strings to describe stats
 *      and perhaps other supported types of ethtool data-sets.
 *      See @ethtool_ops.get_strings
 *
 * @get_channel: Get the current operating channel for the virtual interface.
 *      For monitor interfaces, it should return %NULL unless there's a single
 *      current monitoring channel.
 *
 * @start_p2p_device: Start the given P2P device.
 * @stop_p2p_device: Stop the given P2P device.
 *
 * @set_mac_acl: Sets MAC address control list in AP and P2P GO mode.
 *      Parameters include ACL policy, an array of MAC address of stations
 *      and the number of MAC addresses. If there is already a list in driver
 *      this new list replaces the existing one. Driver has to clear its ACL
 *      when number of MAC addresses entries is passed as 0. Drivers which
 *      advertise the support for MAC based ACL have to implement this callback.
 *
 * @start_radar_detection: Start radar detection in the driver.
 *
 * @update_ft_ies: Provide updated Fast BSS Transition information to the
 *      driver. If the SME is in the driver/firmware, this information can be
 *      used in building Authentication and Reassociation Request frames.
 *
 * @crit_proto_start: Indicates a critical protocol needs more link reliability
 *      for a given duration (milliseconds). The protocol is provided so the
 *      driver can take the most appropriate actions.
 * @crit_proto_stop: Indicates critical protocol no longer needs increased link
 *      reliability. This operation can not fail.
 */
struct cfg80211_ops {
        int     (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
        int     (*resume)(struct wiphy *wiphy);
        void    (*set_wakeup)(struct wiphy *wiphy, bool enabled);

        struct wireless_dev * (*add_virtual_intf)(struct wiphy *wiphy,
                                                  const char *name,
                                                  enum nl80211_iftype type,
                                                  u32 *flags,
                                                  struct vif_params *params);
        int     (*del_virtual_intf)(struct wiphy *wiphy,
                                    struct wireless_dev *wdev);
        int     (*change_virtual_intf)(struct wiphy *wiphy,
                                       struct net_device *dev,
                                       enum nl80211_iftype type, u32 *flags,
                                       struct vif_params *params);

        int     (*add_key)(struct wiphy *wiphy, struct net_device *netdev,
                           u8 key_index, bool pairwise, const u8 *mac_addr,
                           struct key_params *params);
        int     (*get_key)(struct wiphy *wiphy, struct net_device *netdev,
                           u8 key_index, bool pairwise, const u8 *mac_addr,
                           void *cookie,
                           void (*callback)(void *cookie, struct key_params*));
        int     (*del_key)(struct wiphy *wiphy, struct net_device *netdev,
                           u8 key_index, bool pairwise, const u8 *mac_addr);
        int     (*set_default_key)(struct wiphy *wiphy,
                                   struct net_device *netdev,
                                   u8 key_index, bool unicast, bool multicast);
        int     (*set_default_mgmt_key)(struct wiphy *wiphy,
                                        struct net_device *netdev,
                                        u8 key_index);

        int     (*start_ap)(struct wiphy *wiphy, struct net_device *dev,
                            struct cfg80211_ap_settings *settings);
        int     (*change_beacon)(struct wiphy *wiphy, struct net_device *dev,
                                 struct cfg80211_beacon_data *info);
        int     (*stop_ap)(struct wiphy *wiphy, struct net_device *dev);


        int     (*add_station)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *mac, struct station_parameters *params);
        int     (*del_station)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *mac);
        int     (*change_station)(struct wiphy *wiphy, struct net_device *dev,
                                  u8 *mac, struct station_parameters *params);
        int     (*get_station)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *mac, struct station_info *sinfo);
        int     (*dump_station)(struct wiphy *wiphy, struct net_device *dev,
                               int idx, u8 *mac, struct station_info *sinfo);

        int     (*add_mpath)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *dst, u8 *next_hop);
        int     (*del_mpath)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *dst);
        int     (*change_mpath)(struct wiphy *wiphy, struct net_device *dev,
                                  u8 *dst, u8 *next_hop);
        int     (*get_mpath)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *dst, u8 *next_hop,
                               struct mpath_info *pinfo);
        int     (*dump_mpath)(struct wiphy *wiphy, struct net_device *dev,
                               int idx, u8 *dst, u8 *next_hop,
                               struct mpath_info *pinfo);
        int     (*get_mesh_config)(struct wiphy *wiphy,
                                struct net_device *dev,
                                struct mesh_config *conf);
        int     (*update_mesh_config)(struct wiphy *wiphy,
                                      struct net_device *dev, u32 mask,
                                      const struct mesh_config *nconf);
        int     (*join_mesh)(struct wiphy *wiphy, struct net_device *dev,
                             const struct mesh_config *conf,
                             const struct mesh_setup *setup);
        int     (*leave_mesh)(struct wiphy *wiphy, struct net_device *dev);

        int     (*change_bss)(struct wiphy *wiphy, struct net_device *dev,
                              struct bss_parameters *params);

        int     (*set_txq_params)(struct wiphy *wiphy, struct net_device *dev,
                                  struct ieee80211_txq_params *params);

        int     (*libertas_set_mesh_channel)(struct wiphy *wiphy,
                                             struct net_device *dev,
                                             struct ieee80211_channel *chan);

        int     (*set_monitor_channel)(struct wiphy *wiphy,
                                       struct cfg80211_chan_def *chandef);

        int     (*scan)(struct wiphy *wiphy,
                        struct cfg80211_scan_request *request);

        int     (*auth)(struct wiphy *wiphy, struct net_device *dev,
                        struct cfg80211_auth_request *req);
        int     (*assoc)(struct wiphy *wiphy, struct net_device *dev,
                         struct cfg80211_assoc_request *req);
        int     (*deauth)(struct wiphy *wiphy, struct net_device *dev,
                          struct cfg80211_deauth_request *req);
        int     (*disassoc)(struct wiphy *wiphy, struct net_device *dev,
                            struct cfg80211_disassoc_request *req);

        int     (*connect)(struct wiphy *wiphy, struct net_device *dev,
                           struct cfg80211_connect_params *sme);
        int     (*disconnect)(struct wiphy *wiphy, struct net_device *dev,
                              u16 reason_code);

        int     (*join_ibss)(struct wiphy *wiphy, struct net_device *dev,
                             struct cfg80211_ibss_params *params);
        int     (*leave_ibss)(struct wiphy *wiphy, struct net_device *dev);

        int     (*set_mcast_rate)(struct wiphy *wiphy, struct net_device *dev,
                                  int rate[IEEE80211_NUM_BANDS]);

        int     (*set_wiphy_params)(struct wiphy *wiphy, u32 changed);

        int     (*set_tx_power)(struct wiphy *wiphy, struct wireless_dev *wdev,
                                enum nl80211_tx_power_setting type, int mbm);
        int     (*get_tx_power)(struct wiphy *wiphy, struct wireless_dev *wdev,
                                int *dbm);

        int     (*set_wds_peer)(struct wiphy *wiphy, struct net_device *dev,
                                const u8 *addr);

        void    (*rfkill_poll)(struct wiphy *wiphy);

#ifdef CONFIG_NL80211_TESTMODE
        int     (*testmode_cmd)(struct wiphy *wiphy, void *data, int len);
        int     (*testmode_dump)(struct wiphy *wiphy, struct sk_buff *skb,
                                 struct netlink_callback *cb,
                                 void *data, int len);
#endif

        int     (*set_bitrate_mask)(struct wiphy *wiphy,
                                    struct net_device *dev,
                                    const u8 *peer,
                                    const struct cfg80211_bitrate_mask *mask);

        int     (*dump_survey)(struct wiphy *wiphy, struct net_device *netdev,
                        int idx, struct survey_info *info);

        int     (*set_pmksa)(struct wiphy *wiphy, struct net_device *netdev,
                             struct cfg80211_pmksa *pmksa);
        int     (*del_pmksa)(struct wiphy *wiphy, struct net_device *netdev,
                             struct cfg80211_pmksa *pmksa);
        int     (*flush_pmksa)(struct wiphy *wiphy, struct net_device *netdev);

        int     (*remain_on_channel)(struct wiphy *wiphy,
                                     struct wireless_dev *wdev,
                                     struct ieee80211_channel *chan,
                                     unsigned int duration,
                                     u64 *cookie);
        int     (*cancel_remain_on_channel)(struct wiphy *wiphy,
                                            struct wireless_dev *wdev,
                                            u64 cookie);

        int     (*mgmt_tx)(struct wiphy *wiphy, struct wireless_dev *wdev,
                          struct ieee80211_channel *chan, bool offchan,
                          unsigned int wait, const u8 *buf, size_t len,
                          bool no_cck, bool dont_wait_for_ack, u64 *cookie);
        int     (*mgmt_tx_cancel_wait)(struct wiphy *wiphy,
                                       struct wireless_dev *wdev,
                                       u64 cookie);

        int     (*set_power_mgmt)(struct wiphy *wiphy, struct net_device *dev,
                                  bool enabled, int timeout);

        int     (*set_cqm_rssi_config)(struct wiphy *wiphy,
                                       struct net_device *dev,
                                       s32 rssi_thold, u32 rssi_hyst);

        int     (*set_cqm_txe_config)(struct wiphy *wiphy,
                                      struct net_device *dev,
                                      u32 rate, u32 pkts, u32 intvl);

        void    (*mgmt_frame_register)(struct wiphy *wiphy,
                                       struct wireless_dev *wdev,
                                       u16 frame_type, bool reg);

        int     (*set_antenna)(struct wiphy *wiphy, u32 tx_ant, u32 rx_ant);
        int     (*get_antenna)(struct wiphy *wiphy, u32 *tx_ant, u32 *rx_ant);

        int     (*set_ringparam)(struct wiphy *wiphy, u32 tx, u32 rx);
        void    (*get_ringparam)(struct wiphy *wiphy,
                                 u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max);

        int     (*sched_scan_start)(struct wiphy *wiphy,
                                struct net_device *dev,
                                struct cfg80211_sched_scan_request *request);
        int     (*sched_scan_stop)(struct wiphy *wiphy, struct net_device *dev);

        int     (*set_rekey_data)(struct wiphy *wiphy, struct net_device *dev,
                                  struct cfg80211_gtk_rekey_data *data);

        int     (*tdls_mgmt)(struct wiphy *wiphy, struct net_device *dev,
                             u8 *peer, u8 action_code,  u8 dialog_token,
                             u16 status_code, const u8 *buf, size_t len);
        int     (*tdls_oper)(struct wiphy *wiphy, struct net_device *dev,
                             u8 *peer, enum nl80211_tdls_operation oper);

        int     (*probe_client)(struct wiphy *wiphy, struct net_device *dev,
                                const u8 *peer, u64 *cookie);

        int     (*set_noack_map)(struct wiphy *wiphy,
                                  struct net_device *dev,
                                  u16 noack_map);

        int     (*get_et_sset_count)(struct wiphy *wiphy,
                                     struct net_device *dev, int sset);
        void    (*get_et_stats)(struct wiphy *wiphy, struct net_device *dev,
                                struct ethtool_stats *stats, u64 *data);
        void    (*get_et_strings)(struct wiphy *wiphy, struct net_device *dev,
                                  u32 sset, u8 *data);

        int     (*get_channel)(struct wiphy *wiphy,
                               struct wireless_dev *wdev,
                               struct cfg80211_chan_def *chandef);

        int     (*start_p2p_device)(struct wiphy *wiphy,
                                    struct wireless_dev *wdev);
        void    (*stop_p2p_device)(struct wiphy *wiphy,
                                   struct wireless_dev *wdev);

        int     (*set_mac_acl)(struct wiphy *wiphy, struct net_device *dev,
                               const struct cfg80211_acl_data *params);

        int     (*start_radar_detection)(struct wiphy *wiphy,
                                         struct net_device *dev,
                                         struct cfg80211_chan_def *chandef);
        int     (*update_ft_ies)(struct wiphy *wiphy, struct net_device *dev,
                                 struct cfg80211_update_ft_ies_params *ftie);
        int     (*crit_proto_start)(struct wiphy *wiphy,
                                    struct wireless_dev *wdev,
                                    enum nl80211_crit_proto_id protocol,
                                    u16 duration);
        void    (*crit_proto_stop)(struct wiphy *wiphy,
                                   struct wireless_dev *wdev);
};

/*
 * wireless hardware and networking interfaces structures
 * and registration/helper functions
 */

/**
 * enum wiphy_flags - wiphy capability flags
 *
 * @WIPHY_FLAG_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).
 * @WIPHY_FLAG_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() unless the regulatory hint is
 *      from a country IE. 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 guaranteed for frequencies or settings
 *      outside of its regulatory domain. If used in combination with
 *      WIPHY_FLAG_CUSTOM_REGULATORY the inspected country IE power settings
 *      will be followed.
 * @WIPHY_FLAG_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()
 * @WIPHY_FLAG_NETNS_OK: if not set, do not allow changing the netns of this
 *      wiphy at all
 * @WIPHY_FLAG_PS_ON_BY_DEFAULT: if set to true, powersave will be enabled
 *      by default -- this flag will be set depending on the kernel's default
 *      on wiphy_new(), but can be changed by the driver if it has a good
 *      reason to override the default
 * @WIPHY_FLAG_4ADDR_AP: supports 4addr mode even on AP (with a single station
 *      on a VLAN interface)
 * @WIPHY_FLAG_4ADDR_STATION: supports 4addr mode even as a station
 * @WIPHY_FLAG_CONTROL_PORT_PROTOCOL: This device supports setting the
 *      control port protocol ethertype. The device also honours the
 *      control_port_no_encrypt flag.
 * @WIPHY_FLAG_IBSS_RSN: The device supports IBSS RSN.
 * @WIPHY_FLAG_MESH_AUTH: The device supports mesh authentication by routing
 *      auth frames to userspace. See @NL80211_MESH_SETUP_USERSPACE_AUTH.
 * @WIPHY_FLAG_SUPPORTS_SCHED_SCAN: The device supports scheduled scans.
 * @WIPHY_FLAG_SUPPORTS_FW_ROAM: The device supports roaming feature in the
 *      firmware.
 * @WIPHY_FLAG_AP_UAPSD: The device supports uapsd on AP.
 * @WIPHY_FLAG_SUPPORTS_TDLS: The device supports TDLS (802.11z) operation.
 * @WIPHY_FLAG_TDLS_EXTERNAL_SETUP: The device does not handle TDLS (802.11z)
 *      link setup/discovery operations internally. Setup, discovery and
 *      teardown packets should be sent through the @NL80211_CMD_TDLS_MGMT
 *      command. When this flag is not set, @NL80211_CMD_TDLS_OPER should be
 *      used for asking the driver/firmware to perform a TDLS operation.
 * @WIPHY_FLAG_HAVE_AP_SME: device integrates AP SME
 * @WIPHY_FLAG_REPORTS_OBSS: the device will report beacons from other BSSes
 *      when there are virtual interfaces in AP mode by calling
 *      cfg80211_report_obss_beacon().
 * @WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD: When operating as an AP, the device
 *      responds to probe-requests in hardware.
 * @WIPHY_FLAG_OFFCHAN_TX: Device supports direct off-channel TX.
 * @WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL: Device supports remain-on-channel call.
 * @WIPHY_FLAG_SUPPORTS_5_10_MHZ: Device supports 5 MHz and 10 MHz channels.
 */
enum wiphy_flags {
        WIPHY_FLAG_CUSTOM_REGULATORY            = BIT(0),
        WIPHY_FLAG_STRICT_REGULATORY            = BIT(1),
        WIPHY_FLAG_DISABLE_BEACON_HINTS         = BIT(2),
        WIPHY_FLAG_NETNS_OK                     = BIT(3),
        WIPHY_FLAG_PS_ON_BY_DEFAULT             = BIT(4),
        WIPHY_FLAG_4ADDR_AP                     = BIT(5),
        WIPHY_FLAG_4ADDR_STATION                = BIT(6),
        WIPHY_FLAG_CONTROL_PORT_PROTOCOL        = BIT(7),
        WIPHY_FLAG_IBSS_RSN                     = BIT(8),
        WIPHY_FLAG_MESH_AUTH                    = BIT(10),
        WIPHY_FLAG_SUPPORTS_SCHED_SCAN          = BIT(11),
        /* use hole at 12 */
        WIPHY_FLAG_SUPPORTS_FW_ROAM             = BIT(13),
        WIPHY_FLAG_AP_UAPSD                     = BIT(14),
        WIPHY_FLAG_SUPPORTS_TDLS                = BIT(15),
        WIPHY_FLAG_TDLS_EXTERNAL_SETUP          = BIT(16),
        WIPHY_FLAG_HAVE_AP_SME                  = BIT(17),
        WIPHY_FLAG_REPORTS_OBSS                 = BIT(18),
        WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD        = BIT(19),
        WIPHY_FLAG_OFFCHAN_TX                   = BIT(20),
        WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL        = BIT(21),
        WIPHY_FLAG_SUPPORTS_5_10_MHZ            = BIT(22),
};

/**
 * struct ieee80211_iface_limit - limit on certain interface types
 * @max: maximum number of interfaces of these types
 * @types: interface types (bits)
 */
struct ieee80211_iface_limit {
        u16 max;
        u16 types;
};

/**
 * struct ieee80211_iface_combination - possible interface combination
 * @limits: limits for the given interface types
 * @n_limits: number of limitations
 * @num_different_channels: can use up to this many different channels
 * @max_interfaces: maximum number of interfaces in total allowed in this
 *      group
 * @beacon_int_infra_match: In this combination, the beacon intervals
 *      between infrastructure and AP types must match. This is required
 *      only in special cases.
 * @radar_detect_widths: bitmap of channel widths supported for radar detection
 *
 * These examples can be expressed as follows:
 *
 * Allow #STA <= 1, #AP <= 1, matching BI, channels = 1, 2 total:
 *
 *  struct ieee80211_iface_limit limits1[] = {
 *      { .max = 1, .types = BIT(NL80211_IFTYPE_STATION), },
 *      { .max = 1, .types = BIT(NL80211_IFTYPE_AP}, },
 *  };
 *  struct ieee80211_iface_combination combination1 = {
 *      .limits = limits1,
 *      .n_limits = ARRAY_SIZE(limits1),
 *      .max_interfaces = 2,
 *      .beacon_int_infra_match = true,
 *  };
 *
 *
 * Allow #{AP, P2P-GO} <= 8, channels = 1, 8 total:
 *
 *  struct ieee80211_iface_limit limits2[] = {
 *      { .max = 8, .types = BIT(NL80211_IFTYPE_AP) |
 *                           BIT(NL80211_IFTYPE_P2P_GO), },
 *  };
 *  struct ieee80211_iface_combination combination2 = {
 *      .limits = limits2,
 *      .n_limits = ARRAY_SIZE(limits2),
 *      .max_interfaces = 8,
 *      .num_different_channels = 1,
 *  };
 *
 *
 * Allow #STA <= 1, #{P2P-client,P2P-GO} <= 3 on two channels, 4 total.
 * This allows for an infrastructure connection and three P2P connections.
 *
 *  struct ieee80211_iface_limit limits3[] = {
 *      { .max = 1, .types = BIT(NL80211_IFTYPE_STATION), },
 *      { .max = 3, .types = BIT(NL80211_IFTYPE_P2P_GO) |
 *                           BIT(NL80211_IFTYPE_P2P_CLIENT), },
 *  };
 *  struct ieee80211_iface_combination combination3 = {
 *      .limits = limits3,
 *      .n_limits = ARRAY_SIZE(limits3),
 *      .max_interfaces = 4,
 *      .num_different_channels = 2,
 *  };
 */
struct ieee80211_iface_combination {
        const struct ieee80211_iface_limit *limits;
        u32 num_different_channels;
        u16 max_interfaces;
        u8 n_limits;
        bool beacon_int_infra_match;
        u8 radar_detect_widths;
};

struct ieee80211_txrx_stypes {
        u16 tx, rx;
};

/**
 * enum wiphy_wowlan_support_flags - WoWLAN support flags
 * @WIPHY_WOWLAN_ANY: supports wakeup for the special "any"
 *      trigger that keeps the device operating as-is and
 *      wakes up the host on any activity, for example a
 *      received packet that passed filtering; note that the
 *      packet should be preserved in that case
 * @WIPHY_WOWLAN_MAGIC_PKT: supports wakeup on magic packet
 *      (see nl80211.h)
 * @WIPHY_WOWLAN_DISCONNECT: supports wakeup on disconnect
 * @WIPHY_WOWLAN_SUPPORTS_GTK_REKEY: supports GTK rekeying while asleep
 * @WIPHY_WOWLAN_GTK_REKEY_FAILURE: supports wakeup on GTK rekey failure
 * @WIPHY_WOWLAN_EAP_IDENTITY_REQ: supports wakeup on EAP identity request
 * @WIPHY_WOWLAN_4WAY_HANDSHAKE: supports wakeup on 4-way handshake failure
 * @WIPHY_WOWLAN_RFKILL_RELEASE: supports wakeup on RF-kill release
 */
enum wiphy_wowlan_support_flags {
        WIPHY_WOWLAN_ANY                = BIT(0),
        WIPHY_WOWLAN_MAGIC_PKT          = BIT(1),
        WIPHY_WOWLAN_DISCONNECT         = BIT(2),
        WIPHY_WOWLAN_SUPPORTS_GTK_REKEY = BIT(3),
        WIPHY_WOWLAN_GTK_REKEY_FAILURE  = BIT(4),
        WIPHY_WOWLAN_EAP_IDENTITY_REQ   = BIT(5),
        WIPHY_WOWLAN_4WAY_HANDSHAKE     = BIT(6),
        WIPHY_WOWLAN_RFKILL_RELEASE     = BIT(7),
};

struct wiphy_wowlan_tcp_support {
        const struct nl80211_wowlan_tcp_data_token_feature *tok;
        u32 data_payload_max;
        u32 data_interval_max;
        u32 wake_payload_max;
        bool seq;
};

/**
 * struct wiphy_wowlan_support - WoWLAN support data
 * @flags: see &enum wiphy_wowlan_support_flags
 * @n_patterns: number of supported wakeup patterns
 *      (see nl80211.h for the pattern definition)
 * @pattern_max_len: maximum length of each pattern
 * @pattern_min_len: minimum length of each pattern
 * @max_pkt_offset: maximum Rx packet offset
 * @tcp: TCP wakeup support information
 */
struct wiphy_wowlan_support {
        u32 flags;
        int n_patterns;
        int pattern_max_len;
        int pattern_min_len;
        int max_pkt_offset;
        const struct wiphy_wowlan_tcp_support *tcp;
};

/**
 * struct wiphy - wireless hardware description
 * @reg_notifier: the driver's regulatory notification callback,
 *      note that if your driver uses wiphy_apply_custom_regulatory()
 *      the reg_notifier's request can be passed as NULL
 * @regd: the driver's regulatory domain, if one was requested via
 *      the regulatory_hint() API. This can be used by the driver
 *      on the reg_notifier() if it chooses to ignore future
 *      regulatory domain changes caused by other drivers.
 * @signal_type: signal type reported in &struct cfg80211_bss.
 * @cipher_suites: supported cipher suites
 * @n_cipher_suites: number of supported cipher suites
 * @retry_short: Retry limit for short frames (dot11ShortRetryLimit)
 * @retry_long: Retry limit for long frames (dot11LongRetryLimit)
 * @frag_threshold: Fragmentation threshold (dot11FragmentationThreshold);
 *      -1 = fragmentation disabled, only odd values >= 256 used
 * @rts_threshold: RTS threshold (dot11RTSThreshold); -1 = RTS/CTS disabled
 * @_net: the network namespace this wiphy currently lives in
 * @perm_addr: permanent MAC address of this device
 * @addr_mask: If the device supports multiple MAC addresses by masking,
 *      set this to a mask with variable bits set to 1, e.g. if the last
 *      four bits are variable then set it to 00:...:00:0f. The actual
 *      variable bits shall be determined by the interfaces added, with
 *      interfaces not matching the mask being rejected to be brought up.
 * @n_addresses: number of addresses in @addresses.
 * @addresses: If the device has more than one address, set this pointer
 *      to a list of addresses (6 bytes each). The first one will be used
 *      by default for perm_addr. In this case, the mask should be set to
 *      all-zeroes. In this case it is assumed that the device can handle
 *      the same number of arbitrary MAC addresses.
 * @registered: protects ->resume and ->suspend sysfs callbacks against
 *      unregister hardware
 * @debugfsdir: debugfs directory used for this wiphy, will be renamed
 *      automatically on wiphy renames
 * @dev: (virtual) struct device for this wiphy
 * @registered: helps synchronize suspend/resume with wiphy unregister
 * @wext: wireless extension handlers
 * @priv: driver private data (sized according to wiphy_new() parameter)
 * @interface_modes: bitmask of interfaces types valid for this wiphy,
 *      must be set by driver
 * @iface_combinations: Valid interface combinations array, should not
 *      list single interface types.
 * @n_iface_combinations: number of entries in @iface_combinations array.
 * @software_iftypes: bitmask of software interface types, these are not
 *      subject to any restrictions since they are purely managed in SW.
 * @flags: wiphy flags, see &enum wiphy_flags
 * @features: features advertised to nl80211, see &enum nl80211_feature_flags.
 * @bss_priv_size: each BSS struct has private data allocated with it,
 *      this variable determines its size
 * @max_scan_ssids: maximum number of SSIDs the device can scan for in
 *      any given scan
 * @max_sched_scan_ssids: maximum number of SSIDs the device can scan
 *      for in any given scheduled scan
 * @max_match_sets: maximum number of match sets the device can handle
 *      when performing a scheduled scan, 0 if filtering is not
 *      supported.
 * @max_scan_ie_len: maximum length of user-controlled IEs device can
 *      add to probe request frames transmitted during a scan, must not
 *      include fixed IEs like supported rates
 * @max_sched_scan_ie_len: same as max_scan_ie_len, but for scheduled
 *      scans
 * @coverage_class: current coverage class
 * @fw_version: firmware version for ethtool reporting
 * @hw_version: hardware version for ethtool reporting
 * @max_num_pmkids: maximum number of PMKIDs supported by device
 * @privid: a pointer that drivers can use to identify if an arbitrary
 *      wiphy is theirs, e.g. in global notifiers
 * @bands: information about bands/channels supported by this device
 *
 * @mgmt_stypes: bitmasks of frame subtypes that can be subscribed to or
 *      transmitted through nl80211, points to an array indexed by interface
 *      type
 *
 * @available_antennas_tx: bitmap of antennas which are available to be
 *      configured as TX antennas. Antenna configuration commands will be
 *      rejected unless this or @available_antennas_rx is set.
 *
 * @available_antennas_rx: bitmap of antennas which are available to be
 *      configured as RX antennas. Antenna configuration commands will be
 *      rejected unless this or @available_antennas_tx is set.
 *
 * @probe_resp_offload:
 *       Bitmap of supported protocols for probe response offloading.
 *       See &enum nl80211_probe_resp_offload_support_attr. Only valid
 *       when the wiphy flag @WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD is set.
 *
 * @max_remain_on_channel_duration: Maximum time a remain-on-channel operation
 *      may request, if implemented.
 *
 * @wowlan: WoWLAN support information
 * @wowlan_config: current WoWLAN configuration; this should usually not be
 *      used since access to it is necessarily racy, use the parameter passed
 *      to the suspend() operation instead.
 *
 * @ap_sme_capa: AP SME capabilities, flags from &enum nl80211_ap_sme_features.
 * @ht_capa_mod_mask:  Specify what ht_cap values can be over-ridden.
 *      If null, then none can be over-ridden.
 * @vht_capa_mod_mask:  Specify what VHT capabilities can be over-ridden.
 *      If null, then none can be over-ridden.
 *
 * @max_acl_mac_addrs: Maximum number of MAC addresses that the device
 *      supports for ACL.
 *
 * @extended_capabilities: extended capabilities supported by the driver,
 *      additional capabilities might be supported by userspace; these are
 *      the 802.11 extended capabilities ("Extended Capabilities element")
 *      and are in the same format as in the information element. See
 *      802.11-2012 8.4.2.29 for the defined fields.
 * @extended_capabilities_mask: mask of the valid values
 * @extended_capabilities_len: length of the extended capabilities
 */
struct wiphy {
        /* assign these fields before you register the wiphy */

        /* permanent MAC address(es) */
        u8 perm_addr[ETH_ALEN];
        u8 addr_mask[ETH_ALEN];

        struct mac_address *addresses;

        const struct ieee80211_txrx_stypes *mgmt_stypes;

        const struct ieee80211_iface_combination *iface_combinations;
        int n_iface_combinations;
        u16 software_iftypes;

        u16 n_addresses;

        /* Supported interface modes, OR together BIT(NL80211_IFTYPE_...) */
        u16 interface_modes;

        u16 max_acl_mac_addrs;

        u32 flags, features;

        u32 ap_sme_capa;

        enum cfg80211_signal_type signal_type;

        int bss_priv_size;
        u8 max_scan_ssids;
        u8 max_sched_scan_ssids;
        u8 max_match_sets;
        u16 max_scan_ie_len;
        u16 max_sched_scan_ie_len;

        int n_cipher_suites;
        const u32 *cipher_suites;

        u8 retry_short;
        u8 retry_long;
        u32 frag_threshold;
        u32 rts_threshold;
        u8 coverage_class;

        char fw_version[ETHTOOL_FWVERS_LEN];
        u32 hw_version;

#ifdef CONFIG_PM
        const struct wiphy_wowlan_support *wowlan;
        struct cfg80211_wowlan *wowlan_config;
#endif

        u16 max_remain_on_channel_duration;

        u8 max_num_pmkids;

        u32 available_antennas_tx;
        u32 available_antennas_rx;

        /*
         * Bitmap of supported protocols for probe response offloading
         * see &enum nl80211_probe_resp_offload_support_attr. Only valid
         * when the wiphy flag @WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD is set.
         */
        u32 probe_resp_offload;

        const u8 *extended_capabilities, *extended_capabilities_mask;
        u8 extended_capabilities_len;

        /* If multiple wiphys are registered and you're handed e.g.
         * a regular netdev with assigned ieee80211_ptr, you won't
         * know whether it points to a wiphy your driver has registered
         * or not. Assign this to something global to your driver to
         * help determine whether you own this wiphy or not. */
        const void *privid;

        struct ieee80211_supported_band *bands[IEEE80211_NUM_BANDS];

        /* Lets us get back the wiphy on the callback */
        void (*reg_notifier)(struct wiphy *wiphy,
                             struct regulatory_request *request);

        /* fields below are read-only, assigned by cfg80211 */

        const struct ieee80211_regdomain __rcu *regd;

        /* the item in /sys/class/ieee80211/ points to this,
         * you need use set_wiphy_dev() (see below) */
        struct device dev;

        /* protects ->resume, ->suspend sysfs callbacks against unregister hw */
        bool registered;

        /* dir in debugfs: ieee80211/<wiphyname> */
        struct dentry *debugfsdir;

        const struct ieee80211_ht_cap *ht_capa_mod_mask;
        const struct ieee80211_vht_cap *vht_capa_mod_mask;

#ifdef CONFIG_NET_NS
        /* the network namespace this phy lives in currently */
        struct net *_net;
#endif

#ifdef CONFIG_CFG80211_WEXT
        const struct iw_handler_def *wext;
#endif

        char priv[0] __aligned(NETDEV_ALIGN);
};

static inline struct net *wiphy_net(struct wiphy *wiphy)
{
        return read_pnet(&wiphy->_net);
}

static inline void wiphy_net_set(struct wiphy *wiphy, struct net *net)
{
        write_pnet(&wiphy->_net, net);
}

/**
 * wiphy_priv - return priv from wiphy
 *
 * @wiphy: the wiphy whose priv pointer to return
 * Return: The priv of @wiphy.
 */
static inline void *wiphy_priv(struct wiphy *wiphy)
{
        BUG_ON(!wiphy);
        return &wiphy->priv;
}

/**
 * priv_to_wiphy - return the wiphy containing the priv
 *
 * @priv: a pointer previously returned by wiphy_priv
 * Return: The wiphy of @priv.
 */
static inline struct wiphy *priv_to_wiphy(void *priv)
{
        BUG_ON(!priv);
        return container_of(priv, struct wiphy, priv);
}

/**
 * set_wiphy_dev - set device pointer for wiphy
 *
 * @wiphy: The wiphy whose device to bind
 * @dev: The device to parent it to
 */
static inline void set_wiphy_dev(struct wiphy *wiphy, struct device *dev)
{
        wiphy->dev.parent = dev;
}

/**
 * wiphy_dev - get wiphy dev pointer
 *
 * @wiphy: The wiphy whose device struct to look up
 * Return: The dev of @wiphy.
 */
static inline struct device *wiphy_dev(struct wiphy *wiphy)
{
        return wiphy->dev.parent;
}

/**
 * wiphy_name - get wiphy name
 *
 * @wiphy: The wiphy whose name to return
 * Return: The name of @wiphy.
 */
static inline const char *wiphy_name(const struct wiphy *wiphy)
{
        return dev_name(&wiphy->dev);
}

/**
 * wiphy_new - create a new wiphy for use with cfg80211
 *
 * @ops: The configuration operations for this device
 * @sizeof_priv: The size of the private area to allocate
 *
 * Create a new wiphy and associate the given operations with it.
 * @sizeof_priv bytes are allocated for private use.
 *
 * Return: A pointer to the new wiphy. This pointer must be
 * assigned to each netdev's ieee80211_ptr for proper operation.
 */
struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv);

/**
 * wiphy_register - register a wiphy with cfg80211
 *
 * @wiphy: The wiphy to register.
 *
 * Return: A non-negative wiphy index or a negative error code.
 */
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);

/* internal structs */
struct cfg80211_conn;
struct cfg80211_internal_bss;
struct cfg80211_cached_keys;

/**
 * struct wireless_dev - wireless device state
 *
 * For netdevs, this structure must be allocated by the driver
 * that uses the ieee80211_ptr field in struct net_device (this
 * is intentional so it can be allocated along with the netdev.)
 * It need not be registered then as netdev registration will
 * be intercepted by cfg80211 to see the new wireless device.
 *
 * For non-netdev uses, it must also be allocated by the driver
 * in response to the cfg80211 callbacks that require it, as
 * there's no netdev registration in that case it may not be
 * allocated outside of callback operations that return it.
 *
 * @wiphy: pointer to hardware description
 * @iftype: interface type
 * @list: (private) Used to collect the interfaces
 * @netdev: (private) Used to reference back to the netdev, may be %NULL
 * @identifier: (private) Identifier used in nl80211 to identify this
 *      wireless device if it has no netdev
 * @current_bss: (private) Used by the internal configuration code
 * @channel: (private) Used by the internal configuration code to track
 *      the user-set AP, monitor and WDS channel
 * @preset_chandef: (private) Used by the internal configuration code to
 *      track the channel to be used for AP later
 * @bssid: (private) Used by the internal configuration code
 * @ssid: (private) Used by the internal configuration code
 * @ssid_len: (private) Used by the internal configuration code
 * @mesh_id_len: (private) Used by the internal configuration code
 * @mesh_id_up_len: (private) Used by the internal configuration code
 * @wext: (private) Used by the internal wireless extensions compat code
 * @use_4addr: indicates 4addr mode is used on this interface, must be
 *      set by driver (if supported) on add_interface BEFORE registering the
 *      netdev and may otherwise be used by driver read-only, will be update
 *      by cfg80211 on change_interface
 * @mgmt_registrations: list of registrations for management frames
 * @mgmt_registrations_lock: lock for the list
 * @mtx: mutex used to lock data in this struct, may be used by drivers
 *      and some API functions require it held
 * @beacon_interval: beacon interval used on this device for transmitting
 *      beacons, 0 when not valid
 * @address: The address for this device, valid only if @netdev is %NULL
 * @p2p_started: true if this is a P2P Device that has been started
 * @cac_started: true if DFS channel availability check has been started
 * @cac_start_time: timestamp (jiffies) when the dfs state was entered.
 * @ps: powersave mode is enabled
 * @ps_timeout: dynamic powersave timeout
 * @ap_unexpected_nlportid: (private) netlink port ID of application
 *      registered for unexpected class 3 frames (AP mode)
 * @conn: (private) cfg80211 software SME connection state machine data
 * @connect_keys: (private) keys to set after connection is established
 * @ibss_fixed: (private) IBSS is using fixed BSSID
 * @event_list: (private) list for internal event processing
 * @event_lock: (private) lock for event list
 */
struct wireless_dev {
        struct wiphy *wiphy;
        enum nl80211_iftype iftype;

        /* the remainder of this struct should be private to cfg80211 */
        struct list_head list;
        struct net_device *netdev;

        u32 identifier;

        struct list_head mgmt_registrations;
        spinlock_t mgmt_registrations_lock;

        struct mutex mtx;

        bool use_4addr, p2p_started;

        u8 address[ETH_ALEN] __aligned(sizeof(u16));

        /* currently used for IBSS and SME - might be rearranged later */
        u8 ssid[IEEE80211_MAX_SSID_LEN];
        u8 ssid_len, mesh_id_len, mesh_id_up_len;
        struct cfg80211_conn *conn;
        struct cfg80211_cached_keys *connect_keys;

        struct list_head event_list;
        spinlock_t event_lock;

        struct cfg80211_internal_bss *current_bss; /* associated / joined */
        struct cfg80211_chan_def preset_chandef;

        /* for AP and mesh channel tracking */
        struct ieee80211_channel *channel;

        bool ibss_fixed;

        bool ps;
        int ps_timeout;

        int beacon_interval;

        u32 ap_unexpected_nlportid;

        bool cac_started;
        unsigned long cac_start_time;

#ifdef CONFIG_CFG80211_WEXT
        /* wext data */
        struct {
                struct cfg80211_ibss_params ibss;
                struct cfg80211_connect_params connect;
                struct cfg80211_cached_keys *keys;
                u8 *ie;
                size_t ie_len;
                u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
                u8 ssid[IEEE80211_MAX_SSID_LEN];
                s8 default_key, default_mgmt_key;
                bool prev_bssid_valid;
        } wext;
#endif
};

static inline u8 *wdev_address(struct wireless_dev *wdev)
{
        if (wdev->netdev)
                return wdev->netdev->dev_addr;
        return wdev->address;
}

/**
 * wdev_priv - return wiphy priv from wireless_dev
 *
 * @wdev: The wireless device whose wiphy's priv pointer to return
 * Return: The wiphy priv of @wdev.
 */
static inline void *wdev_priv(struct wireless_dev *wdev)
{
        BUG_ON(!wdev);
        return wiphy_priv(wdev->wiphy);
}

/**
 * DOC: Utility functions
 *
 * cfg80211 offers a number of utility functions that can be useful.
 */

/**
 * ieee80211_channel_to_frequency - convert channel number to frequency
 * @chan: channel number
 * @band: band, necessary due to channel number overlap
 * Return: The corresponding frequency (in MHz), or 0 if the conversion failed.
 */
extern int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band);

/**
 * ieee80211_frequency_to_channel - convert frequency to channel number
 * @freq: center frequency
 * Return: The corresponding channel, or 0 if the conversion failed.
 */
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
 * @wiphy: the struct wiphy to get the channel for
 * @freq: the center frequency of the channel
 * Return: The channel struct from @wiphy at @freq.
 */
static inline struct ieee80211_channel *
ieee80211_get_channel(struct wiphy *wiphy, int freq)
{
        return __ieee80211_get_channel(wiphy, freq);
}

/**
 * ieee80211_get_response_rate - get basic rate for a given rate
 *
 * @sband: the band to look for rates in
 * @basic_rates: bitmap of basic rates
 * @bitrate: the bitrate for which to find the basic rate
 *
 * Return: The basic rate corresponding to a given bitrate, that
 * is the next lower bitrate contained in the basic rate map,
 * which is, for this function, given as a bitmap of indices of
 * rates in the band's bitrate table.
 */
struct ieee80211_rate *
ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
                            u32 basic_rates, int bitrate);

/**
 * ieee80211_mandatory_rates - get mandatory rates for a given band
 * @sband: the band to look for rates in
 *
 * This function returns a bitmap of the mandatory rates for the given
 * band, bits are set according to the rate position in the bitrates array.
 */
u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband);

/*
 * Radiotap parsing functions -- for controlled injection support
 *
 * Implemented in net/wireless/radiotap.c
 * Documentation in Documentation/networking/radiotap-headers.txt
 */

struct radiotap_align_size {
        uint8_t align:4, size:4;
};

struct ieee80211_radiotap_namespace {
        const struct radiotap_align_size *align_size;
        int n_bits;
        uint32_t oui;
        uint8_t subns;
};

struct ieee80211_radiotap_vendor_namespaces {
        const struct ieee80211_radiotap_namespace *ns;
        int n_ns;
};

/**
 * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args
 * @this_arg_index: index of current arg, valid after each successful call
 *      to ieee80211_radiotap_iterator_next()
 * @this_arg: pointer to current radiotap arg; it is valid after each
 *      call to ieee80211_radiotap_iterator_next() but also after
 *      ieee80211_radiotap_iterator_init() where it will point to
 *      the beginning of the actual data portion
 * @this_arg_size: length of the current arg, for convenience
 * @current_namespace: pointer to the current namespace definition
 *      (or internally %NULL if the current namespace is unknown)
 * @is_radiotap_ns: indicates whether the current namespace is the default
 *      radiotap namespace or not
 *
 * @_rtheader: pointer to the radiotap header we are walking through
 * @_max_length: length of radiotap header in cpu byte ordering
 * @_arg_index: next argument index
 * @_arg: next argument pointer
 * @_next_bitmap: internal pointer to next present u32
 * @_bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present
 * @_vns: vendor namespace definitions
 * @_next_ns_data: beginning of the next namespace's data
 * @_reset_on_ext: internal; reset the arg index to 0 when going to the
 *      next bitmap word
 *
 * Describes the radiotap parser state. Fields prefixed with an underscore
 * must not be used by users of the parser, only by the parser internally.
 */

struct ieee80211_radiotap_iterator {
        struct ieee80211_radiotap_header *_rtheader;
        const struct ieee80211_radiotap_vendor_namespaces *_vns;
        const struct ieee80211_radiotap_namespace *current_namespace;

        unsigned char *_arg, *_next_ns_data;
        __le32 *_next_bitmap;

        unsigned char *this_arg;
        int this_arg_index;
        int this_arg_size;

        int is_radiotap_ns;

        int _max_length;
        int _arg_index;
        uint32_t _bitmap_shifter;
        int _reset_on_ext;
};

extern int ieee80211_radiotap_iterator_init(
        struct ieee80211_radiotap_iterator *iterator,
        struct ieee80211_radiotap_header *radiotap_header,
        int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns);

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
 *
 * @skb: the frame
 *
 * Given an skb with a raw 802.11 header at the data pointer this function
 * returns the 802.11 header length.
 *
 * Return: The 802.11 header length in bytes (not including encryption
 * headers). Or 0 if the data in the sk_buff is too short to contain a valid
 * 802.11 header.
 */
unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb);

/**
 * ieee80211_hdrlen - get header length in bytes from frame control
 * @fc: frame control field in little-endian format
 * Return: The header length in bytes.
 */
unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc);

/**
 * ieee80211_get_mesh_hdrlen - get mesh extension header length
 * @meshhdr: the mesh extension header, only the flags field
 *      (first byte) will be accessed
 * Return: The length of the extension header, which is always at
 * least 6 bytes and at most 18 if address 5 and 6 are present.
 */
unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr);

/**
 * DOC: Data path helpers
 *
 * In addition to generic utilities, cfg80211 also offers
 * functions that help implement the data path for devices
 * that do not do the 802.11/802.3 conversion on the device.
 */

/**
 * ieee80211_data_to_8023 - convert an 802.11 data frame to 802.3
 * @skb: the 802.11 data frame
 * @addr: the device MAC address
 * @iftype: the virtual interface type
 * Return: 0 on success. Non-zero on error.
 */
int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
                           enum nl80211_iftype iftype);

/**
 * ieee80211_data_from_8023 - convert an 802.3 frame to 802.11
 * @skb: the 802.3 frame
 * @addr: the device MAC address
 * @iftype: the virtual interface type
 * @bssid: the network bssid (used only for iftype STATION and ADHOC)
 * @qos: build 802.11 QoS data frame
 * Return: 0 on success, or a negative error code.
 */
int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
                             enum nl80211_iftype iftype, u8 *bssid, bool qos);

/**
 * ieee80211_amsdu_to_8023s - decode an IEEE 802.11n A-MSDU frame
 *
 * Decode an IEEE 802.11n A-MSDU frame and convert it to a list of
 * 802.3 frames. The @list will be empty if the decode fails. The
 * @skb is consumed after the function returns.
 *
 * @skb: The input IEEE 802.11n A-MSDU frame.
 * @list: The output list of 802.3 frames. It must be allocated and
 *      initialized by by the caller.
 * @addr: The device MAC address.
 * @iftype: The device interface type.
 * @extra_headroom: The hardware extra headroom for SKBs in the @list.
 * @has_80211_header: Set it true if SKB is with IEEE 802.11 header.
 */
void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
                              const u8 *addr, enum nl80211_iftype iftype,
                              const unsigned int extra_headroom,
                              bool has_80211_header);

/**
 * cfg80211_classify8021d - determine the 802.1p/1d tag for a data frame
 * @skb: the data frame
 * Return: The 802.1p/1d tag.
 */
unsigned int cfg80211_classify8021d(struct sk_buff *skb);

/**
 * cfg80211_find_ie - find information element in data
 *
 * @eid: element ID
 * @ies: data consisting of IEs
 * @len: length of data
 *
 * Return: %NULL if the element ID could not be found or if
 * the element is invalid (claims to be longer than the given
 * data), or a pointer to the first byte of the requested
 * element, that is the byte containing the element ID.
 *
 * Note: There are no checks on the element length other than
 * having to fit into the given data.
 */
const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len);

/**
 * cfg80211_find_vendor_ie - find vendor specific information element in data
 *
 * @oui: vendor OUI
 * @oui_type: vendor-specific OUI type
 * @ies: data consisting of IEs
 * @len: length of data
 *
 * Return: %NULL if the vendor specific element ID could not be found or if the
 * element is invalid (claims to be longer than the given data), or a pointer to
 * the first byte of the requested element, that is the byte containing the
 * element ID.
 *
 * Note: There are no checks on the element length other than having to fit into
 * the given data.
 */
const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
                                  const u8 *ies, int len);

/**
 * DOC: Regulatory enforcement infrastructure
 *
 * TODO
 */

/**
 * regulatory_hint - driver hint to the wireless core a regulatory domain
 * @wiphy: the wireless device giving the hint (used only for reporting
 *      conflicts)
 * @alpha2: the ISO/IEC 3166 alpha2 the driver claims its regulatory domain
 *      should be in. If @rd is set this should be NULL. Note that if you
 *      set this to NULL you should still set rd->alpha2 to some accepted
 *      alpha2.
 *
 * Wireless drivers can use this function to hint to the wireless core
 * what it believes should be the current regulatory domain by
 * giving it an ISO/IEC 3166 alpha2 country code it knows its regulatory
 * domain should be in or by providing a completely build regulatory domain.
 * If the driver provides an ISO/IEC 3166 alpha2 userspace will be queried
 * for a regulatory domain structure for the respective country.
 *
 * The wiphy must have been registered to cfg80211 prior to this call.
 * For cfg80211 drivers this means you must first use wiphy_register(),
 * for mac80211 drivers you must first use ieee80211_register_hw().
 *
 * Drivers should check the return value, its possible you can get
 * an -ENOMEM.
 *
 * Return: 0 on success. -ENOMEM.
 */
extern int regulatory_hint(struct wiphy *wiphy, const char *alpha2);

/**
 * wiphy_apply_custom_regulatory - apply a custom driver regulatory domain
 * @wiphy: the wireless device we want to process the regulatory domain on
 * @regd: the custom regulatory domain to use for this wiphy
 *
 * Drivers can sometimes have custom regulatory domains which do not apply
 * to a specific country. Drivers can use this to apply such custom regulatory
 * domains. This routine must be called prior to wiphy registration. The
 * custom regulatory domain will be trusted completely and as such previous
 * default channel settings will be disregarded. If no rule is found for a
 * channel on the regulatory domain the channel will be disabled.
 */
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
 *
 * Use this function to get the regulatory rule for a specific frequency on
 * a given wireless device. If the device has a specific regulatory domain
 * it wants to follow we respect that unless a country IE has been received
 * and processed already.
 *
 * Return: A valid pointer, or, when an error occurs, for example if no rule
 * can be found, the return value is encoded using ERR_PTR(). Use IS_ERR() to
 * check and PTR_ERR() to obtain the numeric return value. The numeric return
 * value will be -ERANGE if we determine the given center_freq does not even
 * have a regulatory rule for a frequency range in the center_freq's band.
 * See freq_in_rule_band() for our current definition of a band -- this is
 * purely subjective and right now it's 802.11 specific.
 */
const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
                                               u32 center_freq);

/*
 * callbacks for asynchronous cfg80211 methods, notification
 * functions and BSS handling helpers
 */

/**
 * cfg80211_scan_done - notify that scan finished
 *
 * @request: the corresponding scan request
 * @aborted: set to true if the scan was aborted for any reason,
 *      userspace will be notified of that
 */
void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted);

/**
 * cfg80211_sched_scan_results - notify that new scan results are available
 *
 * @wiphy: the wiphy which got scheduled scan results
 */
void cfg80211_sched_scan_results(struct wiphy *wiphy);

/**
 * cfg80211_sched_scan_stopped - notify that the scheduled scan has stopped
 *
 * @wiphy: the wiphy on which the scheduled scan stopped
 *
 * The driver can call this function to inform cfg80211 that the
 * scheduled scan had to be stopped, for whatever reason.  The driver
 * is then called back via the sched_scan_stop operation when done.
 */
void cfg80211_sched_scan_stopped(struct wiphy *wiphy);

/**
 * cfg80211_inform_bss_frame - inform cfg80211 of a received BSS frame
 *
 * @wiphy: the wiphy reporting the BSS
 * @channel: The channel the frame was received on
 * @mgmt: the management frame (probe response or beacon)
 * @len: length of the management frame
 * @signal: the signal strength, type depends on the wiphy's signal_type
 * @gfp: context flags
 *
 * This informs cfg80211 that BSS information was found and
 * the BSS should be updated/added.
 *
 * Return: A referenced struct, must be released with cfg80211_put_bss()!
 * Or %NULL on error.
 */
struct cfg80211_bss * __must_check
cfg80211_inform_bss_frame(struct wiphy *wiphy,
                          struct ieee80211_channel *channel,
                          struct ieee80211_mgmt *mgmt, size_t len,
                          s32 signal, gfp_t gfp);

/**
 * cfg80211_inform_bss - inform cfg80211 of a new BSS
 *
 * @wiphy: the wiphy reporting the BSS
 * @channel: The channel the frame was received on
 * @bssid: the BSSID of the BSS
 * @tsf: the TSF sent by the peer in the beacon/probe response (or 0)
 * @capability: the capability field sent by the peer
 * @beacon_interval: the beacon interval announced by the peer
 * @ie: additional IEs sent by the peer
 * @ielen: length of the additional IEs
 * @signal: the signal strength, type depends on the wiphy's signal_type
 * @gfp: context flags
 *
 * This informs cfg80211 that BSS information was found and
 * the BSS should be updated/added.
 *
 * Return: A referenced struct, must be released with cfg80211_put_bss()!
 * Or %NULL on error.
 */
struct cfg80211_bss * __must_check
cfg80211_inform_bss(struct wiphy *wiphy,
                    struct ieee80211_channel *channel,
                    const u8 *bssid, u64 tsf, u16 capability,
                    u16 beacon_interval, const u8 *ie, size_t ielen,
                    s32 signal, gfp_t gfp);

struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
                                      struct ieee80211_channel *channel,
                                      const u8 *bssid,
                                      const u8 *ssid, size_t ssid_len,
                                      u16 capa_mask, u16 capa_val);
static inline struct cfg80211_bss *
cfg80211_get_ibss(struct wiphy *wiphy,
                  struct ieee80211_channel *channel,
                  const u8 *ssid, size_t ssid_len)
{
        return cfg80211_get_bss(wiphy, channel, NULL, ssid, ssid_len,
                                WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
}

/**
 * cfg80211_ref_bss - reference BSS struct
 * @wiphy: the wiphy this BSS struct belongs to
 * @bss: the BSS struct to reference
 *
 * Increments the refcount of the given BSS struct.
 */
void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);

/**
 * cfg80211_put_bss - unref BSS struct
 * @wiphy: the wiphy this BSS struct belongs to
 * @bss: the BSS struct
 *
 * Decrements the refcount of the given BSS struct.
 */
void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);

/**
 * cfg80211_unlink_bss - unlink BSS from internal data structures
 * @wiphy: the wiphy
 * @bss: the bss to remove
 *
 * This function removes the given BSS from the internal data structures
 * thereby making it no longer show up in scan results etc. Use this
 * function when you detect a BSS is gone. Normally BSSes will also time
 * out, so it is not necessary to use this function at all.
 */
void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);

/**
 * cfg80211_rx_mlme_mgmt - notification of processed MLME management frame
 * @dev: network device
 * @buf: authentication frame (header + body)
 * @len: length of the frame data
 *
 * This function is called whenever an authentication, disassociation or
 * deauthentication frame has been received and processed in station mode.
 * After being asked to authenticate via cfg80211_ops::auth() the driver must
 * call either this function or cfg80211_auth_timeout().
 * After being asked to associate via cfg80211_ops::assoc() the driver must
 * call either this function or cfg80211_auth_timeout().
 * While connected, the driver must calls this for received and processed
 * disassociation and deauthentication frames. If the frame couldn't be used
 * because it was unprotected, the driver must call the function
 * cfg80211_rx_unprot_mlme_mgmt() instead.
 *
 * This function may sleep. The caller must hold the corresponding wdev's mutex.
 */
void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len);

/**
 * cfg80211_auth_timeout - notification of timed out authentication
 * @dev: network device
 * @addr: The MAC address of the device with which the authentication timed out
 *
 * This function may sleep. The caller must hold the corresponding wdev's
 * mutex.
 */
void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr);

/**
 * cfg80211_rx_assoc_resp - notification of processed association response
 * @dev: network device
 * @bss: the BSS that association was requested with, ownership of the pointer
 *      moves to cfg80211 in this call
 * @buf: authentication frame (header + body)
 * @len: length of the frame data
 *
 * After being asked to associate via cfg80211_ops::assoc() the driver must
 * call either this function or cfg80211_auth_timeout().
 *
 * This function may sleep. The caller must hold the corresponding wdev's mutex.
 */
void cfg80211_rx_assoc_resp(struct net_device *dev,
                            struct cfg80211_bss *bss,
                            const u8 *buf, size_t len);

/**
 * cfg80211_assoc_timeout - notification of timed out association
 * @dev: network device
 * @bss: The BSS entry with which association timed out.
 *
 * This function may sleep. The caller must hold the corresponding wdev's mutex.
 */
void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss);

/**
 * cfg80211_tx_mlme_mgmt - notification of transmitted deauth/disassoc frame
 * @dev: network device
 * @buf: 802.11 frame (header + body)
 * @len: length of the frame data
 *
 * This function is called whenever deauthentication has been processed in
 * station mode. This includes both received deauthentication frames and
 * locally generated ones. This function may sleep. The caller must hold the
 * corresponding wdev's mutex.
 */
void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len);

/**
 * cfg80211_rx_unprot_mlme_mgmt - notification of unprotected mlme mgmt frame
 * @dev: network device
 * @buf: deauthentication frame (header + body)
 * @len: length of the frame data
 *
 * This function is called whenever a received deauthentication or dissassoc
 * frame has been dropped in station mode because of MFP being used but the
 * frame was not protected. This function may sleep.
 */
void cfg80211_rx_unprot_mlme_mgmt(struct net_device *dev,
                                  const u8 *buf, size_t len);

/**
 * cfg80211_michael_mic_failure - notification of Michael MIC failure (TKIP)
 * @dev: network device
 * @addr: The source MAC address of the frame
 * @key_type: The key type that the received frame used
 * @key_id: Key identifier (0..3). Can be -1 if missing.
 * @tsc: The TSC value of the frame that generated the MIC failure (6 octets)
 * @gfp: allocation flags
 *
 * This function is called whenever the local MAC detects a MIC failure in a
 * received frame. This matches with MLME-MICHAELMICFAILURE.indication()
 * primitive.
 */
void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
                                  enum nl80211_key_type key_type, int key_id,
                                  const u8 *tsc, gfp_t gfp);

/**
 * cfg80211_ibss_joined - notify cfg80211 that device joined an IBSS
 *
 * @dev: network device
 * @bssid: the BSSID of the IBSS joined
 * @gfp: allocation flags
 *
 * This function notifies cfg80211 that the device joined an IBSS or
 * switched to a different BSSID. Before this function can be called,
 * either a beacon has to have been received from the IBSS, or one of
 * the cfg80211_inform_bss{,_frame} functions must have been called
 * with the locally generated beacon -- this guarantees that there is
 * always a scan result for this IBSS. cfg80211 will handle the rest.
 */
void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp);

/**
 * cfg80211_notify_new_candidate - notify cfg80211 of a new mesh peer candidate
 *
 * @dev: network device
 * @macaddr: the MAC address of the new candidate
 * @ie: information elements advertised by the peer candidate
 * @ie_len: lenght of the information elements buffer
 * @gfp: allocation flags
 *
 * This function notifies cfg80211 that the mesh peer candidate has been
 * detected, most likely via a beacon or, less likely, via a probe response.
 * cfg80211 then sends a notification to userspace.
 */
void cfg80211_notify_new_peer_candidate(struct net_device *dev,
                const u8 *macaddr, const u8 *ie, u8 ie_len, gfp_t gfp);

/**
 * DOC: RFkill integration
 *
 * RFkill integration in cfg80211 is almost invisible to drivers,
 * as cfg80211 automatically registers an rfkill instance for each
 * wireless device it knows about. Soft kill is also translated
 * into disconnecting and turning all interfaces off, drivers are
 * expected to turn off the device when all interfaces are down.
 *
 * However, devices may have a hard RFkill line, in which case they
 * also need to interact with the rfkill subsystem, via cfg80211.
 * They can do this with a few helper functions documented here.
 */

/**
 * wiphy_rfkill_set_hw_state - notify cfg80211 about hw block state
 * @wiphy: the wiphy
 * @blocked: block status
 */
void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked);

/**
 * wiphy_rfkill_start_polling - start polling rfkill
 * @wiphy: the wiphy
 */
void wiphy_rfkill_start_polling(struct wiphy *wiphy);

/**
 * wiphy_rfkill_stop_polling - stop polling rfkill
 * @wiphy: the wiphy
 */
void wiphy_rfkill_stop_polling(struct wiphy *wiphy);

#ifdef CONFIG_NL80211_TESTMODE
/**
 * DOC: Test mode
 *
 * Test mode is a set of utility functions to allow drivers to
 * interact with driver-specific tools to aid, for instance,
 * factory programming.
 *
 * This chapter describes how drivers interact with it, for more
 * information see the nl80211 book's chapter on it.
 */

/**
 * cfg80211_testmode_alloc_reply_skb - allocate testmode reply
 * @wiphy: the wiphy
 * @approxlen: an upper bound of the length of the data that will
 *      be put into the skb
 *
 * This function allocates and pre-fills an skb for a reply to
 * the testmode command. Since it is intended for a reply, calling
 * it outside of the @testmode_cmd operation is invalid.
 *
 * The returned skb is pre-filled with the wiphy index and set up in
 * a way that any data that is put into the skb (with skb_put(),
 * nla_put() or similar) will end up being within the
 * %NL80211_ATTR_TESTDATA attribute, so all that needs to be done
 * with the skb is adding data for the corresponding userspace tool
 * which can then read that data out of the testdata attribute. You
 * must not modify the skb in any other way.
 *
 * When done, call cfg80211_testmode_reply() with the skb and return
 * its error code as the result of the @testmode_cmd operation.
 *
 * Return: An allocated and pre-filled skb. %NULL if any errors happen.
 */
struct sk_buff *cfg80211_testmode_alloc_reply_skb(struct wiphy *wiphy,
                                                  int approxlen);

/**
 * cfg80211_testmode_reply - send the reply skb
 * @skb: The skb, must have been allocated with
 *      cfg80211_testmode_alloc_reply_skb()
 *
 * Since calling this function will usually be the last thing
 * before returning from the @testmode_cmd you should return
 * the error code.  Note that this function consumes the skb
 * regardless of the return value.
 *
 * Return: An error code or 0 on success.
 */
int cfg80211_testmode_reply(struct sk_buff *skb);

/**
 * cfg80211_testmode_alloc_event_skb - allocate testmode event
 * @wiphy: the wiphy
 * @approxlen: an upper bound of the length of the data that will
 *      be put into the skb
 * @gfp: allocation flags
 *
 * This function allocates and pre-fills an skb for an event on the
 * testmode multicast group.
 *
 * The returned skb is set up in the same way as with
 * cfg80211_testmode_alloc_reply_skb() but prepared for an event. As
 * there, you should simply add data to it that will then end up in the
 * %NL80211_ATTR_TESTDATA attribute. Again, you must not modify the skb
 * in any other way.
 *
 * When done filling the skb, call cfg80211_testmode_event() with the
 * skb to send the event.
 *
 * Return: An allocated and pre-filled skb. %NULL if any errors happen.
 */
struct sk_buff *cfg80211_testmode_alloc_event_skb(struct wiphy *wiphy,
                                                  int approxlen, gfp_t gfp);

/**
 * cfg80211_testmode_event - send the event
 * @skb: The skb, must have been allocated with
 *      cfg80211_testmode_alloc_event_skb()
 * @gfp: allocation flags
 *
 * This function sends the given @skb, which must have been allocated
 * by cfg80211_testmode_alloc_event_skb(), as an event. It always
 * consumes it.
 */
void cfg80211_testmode_event(struct sk_buff *skb, gfp_t gfp);

#define CFG80211_TESTMODE_CMD(cmd)      .testmode_cmd = (cmd),
#define CFG80211_TESTMODE_DUMP(cmd)     .testmode_dump = (cmd),
#else
#define CFG80211_TESTMODE_CMD(cmd)
#define CFG80211_TESTMODE_DUMP(cmd)
#endif

/**
 * cfg80211_connect_result - notify cfg80211 of connection result
 *
 * @dev: network device
 * @bssid: the BSSID of the AP
 * @req_ie: association request IEs (maybe be %NULL)
 * @req_ie_len: association request IEs length
 * @resp_ie: association response IEs (may be %NULL)
 * @resp_ie_len: assoc response IEs length
 * @status: status code, 0 for successful connection, use
 *      %WLAN_STATUS_UNSPECIFIED_FAILURE if your device cannot give you
 *      the real status code for failures.
 * @gfp: allocation flags
 *
 * It should be called by the underlying driver whenever connect() has
 * succeeded.
 */
void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
                             const u8 *req_ie, size_t req_ie_len,
                             const u8 *resp_ie, size_t resp_ie_len,
                             u16 status, gfp_t gfp);

/**
 * cfg80211_roamed - notify cfg80211 of roaming
 *
 * @dev: network device
 * @channel: the channel of the new AP
 * @bssid: the BSSID of the new AP
 * @req_ie: association request IEs (maybe be %NULL)
 * @req_ie_len: association request IEs length
 * @resp_ie: association response IEs (may be %NULL)
 * @resp_ie_len: assoc response IEs length
 * @gfp: allocation flags
 *
 * It should be called by the underlying driver whenever it roamed
 * from one AP to another while connected.
 */
void cfg80211_roamed(struct net_device *dev,
                     struct ieee80211_channel *channel,
                     const u8 *bssid,
                     const u8 *req_ie, size_t req_ie_len,
                     const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp);

/**
 * cfg80211_roamed_bss - notify cfg80211 of roaming
 *
 * @dev: network device
 * @bss: entry of bss to which STA got roamed
 * @req_ie: association request IEs (maybe be %NULL)
 * @req_ie_len: association request IEs length
 * @resp_ie: association response IEs (may be %NULL)
 * @resp_ie_len: assoc response IEs length
 * @gfp: allocation flags
 *
 * This is just a wrapper to notify cfg80211 of roaming event with driver
 * passing bss to avoid a race in timeout of the bss entry. It should be
 * called by the underlying driver whenever it roamed from one AP to another
 * while connected. Drivers which have roaming implemented in firmware
 * may use this function to avoid a race in bss entry timeout where the bss
 * entry of the new AP is seen in the driver, but gets timed out by the time
 * it is accessed in __cfg80211_roamed() due to delay in scheduling
 * rdev->event_work. In case of any failures, the reference is released
 * either in cfg80211_roamed_bss() or in __cfg80211_romed(), Otherwise,
 * it will be released while diconneting from the current bss.
 */
void cfg80211_roamed_bss(struct net_device *dev, struct cfg80211_bss *bss,
                         const u8 *req_ie, size_t req_ie_len,
                         const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp);

/**
 * cfg80211_disconnected - notify cfg80211 that connection was dropped
 *
 * @dev: network device
 * @ie: information elements of the deauth/disassoc frame (may be %NULL)
 * @ie_len: length of IEs
 * @reason: reason code for the disconnection, set it to 0 if unknown
 * @gfp: allocation flags
 *
 * After it calls this function, the driver should enter an idle state
 * and not try to connect to any AP any more.
 */
void cfg80211_disconnected(struct net_device *dev, u16 reason,
                           u8 *ie, size_t ie_len, gfp_t gfp);

/**
 * cfg80211_ready_on_channel - notification of remain_on_channel start
 * @wdev: wireless device
 * @cookie: the request cookie
 * @chan: The current channel (from remain_on_channel request)
 * @duration: Duration in milliseconds that the driver intents to remain on the
 *      channel
 * @gfp: allocation flags
 */
void cfg80211_ready_on_channel(struct wireless_dev *wdev, u64 cookie,
                               struct ieee80211_channel *chan,
                               unsigned int duration, gfp_t gfp);

/**
 * cfg80211_remain_on_channel_expired - remain_on_channel duration expired
 * @wdev: wireless device
 * @cookie: the request cookie
 * @chan: The current channel (from remain_on_channel request)
 * @gfp: allocation flags
 */
void cfg80211_remain_on_channel_expired(struct wireless_dev *wdev, u64 cookie,
                                        struct ieee80211_channel *chan,
                                        gfp_t gfp);


/**
 * cfg80211_new_sta - notify userspace about station
 *
 * @dev: the netdev
 * @mac_addr: the station's address
 * @sinfo: the station information
 * @gfp: allocation flags
 */
void cfg80211_new_sta(struct net_device *dev, const u8 *mac_addr,
                      struct station_info *sinfo, gfp_t gfp);

/**
 * cfg80211_del_sta - notify userspace about deletion of a station
 *
 * @dev: the netdev
 * @mac_addr: the station's address
 * @gfp: allocation flags
 */
void cfg80211_del_sta(struct net_device *dev, const u8 *mac_addr, gfp_t gfp);

/**
 * cfg80211_conn_failed - connection request failed notification
 *
 * @dev: the netdev
 * @mac_addr: the station's address
 * @reason: the reason for connection failure
 * @gfp: allocation flags
 *
 * Whenever a station tries to connect to an AP and if the station
 * could not connect to the AP as the AP has rejected the connection
 * for some reasons, this function is called.
 *
 * The reason for connection failure can be any of the value from
 * nl80211_connect_failed_reason enum
 */
void cfg80211_conn_failed(struct net_device *dev, const u8 *mac_addr,
                          enum nl80211_connect_failed_reason reason,
                          gfp_t gfp);

/**
 * cfg80211_rx_mgmt - notification of received, unprocessed management frame
 * @wdev: wireless device receiving the frame
 * @freq: Frequency on which the frame was received in MHz
 * @sig_dbm: signal strength in mBm, or 0 if unknown
 * @buf: Management frame (header + body)
 * @len: length of the frame data
 * @gfp: context flags
 *
 * This function is called whenever an Action frame is received for a station
 * mode interface, but is not processed in kernel.
 *
 * Return: %true if a user space application has registered for this frame.
 * For action frames, that makes it responsible for rejecting unrecognized
 * action frames; %false otherwise, in which case for action frames the
 * driver is responsible for rejecting the frame.
 */
bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_dbm,
                      const u8 *buf, size_t len, gfp_t gfp);

/**
 * cfg80211_mgmt_tx_status - notification of TX status for management frame
 * @wdev: wireless device receiving the frame
 * @cookie: Cookie returned by cfg80211_ops::mgmt_tx()
 * @buf: Management frame (header + body)
 * @len: length of the frame data
 * @ack: Whether frame was acknowledged
 * @gfp: context flags
 *
 * This function is called whenever a management frame was requested to be
 * transmitted with cfg80211_ops::mgmt_tx() to report the TX status of the
 * transmission attempt.
 */
void cfg80211_mgmt_tx_status(struct wireless_dev *wdev, u64 cookie,
                             const u8 *buf, size_t len, bool ack, gfp_t gfp);


/**
 * cfg80211_cqm_rssi_notify - connection quality monitoring rssi event
 * @dev: network device
 * @rssi_event: the triggered RSSI event
 * @gfp: context flags
 *
 * This function is called when a configured connection quality monitoring
 * rssi threshold reached event occurs.
 */
void cfg80211_cqm_rssi_notify(struct net_device *dev,
                              enum nl80211_cqm_rssi_threshold_event rssi_event,
                              gfp_t gfp);

/**
 * cfg80211_radar_event - radar detection event
 * @wiphy: the wiphy
 * @chandef: chandef for the current channel
 * @gfp: context flags
 *
 * This function is called when a radar is detected on the current chanenl.
 */
void cfg80211_radar_event(struct wiphy *wiphy,
                          struct cfg80211_chan_def *chandef, gfp_t gfp);

/**
 * cfg80211_cac_event - Channel availability check (CAC) event
 * @netdev: network device
 * @event: type of event
 * @gfp: context flags
 *
 * This function is called when a Channel availability check (CAC) is finished
 * or aborted. This must be called to notify the completion of a CAC process,
 * also by full-MAC drivers.
 */
void cfg80211_cac_event(struct net_device *netdev,
                        enum nl80211_radar_event event, gfp_t gfp);


/**
 * cfg80211_cqm_pktloss_notify - notify userspace about packetloss to peer
 * @dev: network device
 * @peer: peer's MAC address
 * @num_packets: how many packets were lost -- should be a fixed threshold
 *      but probably no less than maybe 50, or maybe a throughput dependent
 *      threshold (to account for temporary interference)
 * @gfp: context flags
 */
void cfg80211_cqm_pktloss_notify(struct net_device *dev,
                                 const u8 *peer, u32 num_packets, gfp_t gfp);

/**
 * cfg80211_cqm_txe_notify - TX error rate event
 * @dev: network device
 * @peer: peer's MAC address
 * @num_packets: how many packets were lost
 * @rate: % of packets which failed transmission
 * @intvl: interval (in s) over which the TX failure threshold was breached.
 * @gfp: context flags
 *
 * Notify userspace when configured % TX failures over number of packets in a
 * given interval is exceeded.
 */
void cfg80211_cqm_txe_notify(struct net_device *dev, const u8 *peer,
                             u32 num_packets, u32 rate, u32 intvl, gfp_t gfp);

/**
 * cfg80211_gtk_rekey_notify - notify userspace about driver rekeying
 * @dev: network device
 * @bssid: BSSID of AP (to avoid races)
 * @replay_ctr: new replay counter
 * @gfp: allocation flags
 */
void cfg80211_gtk_rekey_notify(struct net_device *dev, const u8 *bssid,
                               const u8 *replay_ctr, gfp_t gfp);

/**
 * cfg80211_pmksa_candidate_notify - notify about PMKSA caching candidate
 * @dev: network device
 * @index: candidate index (the smaller the index, the higher the priority)
 * @bssid: BSSID of AP
 * @preauth: Whether AP advertises support for RSN pre-authentication
 * @gfp: allocation flags
 */
void cfg80211_pmksa_candidate_notify(struct net_device *dev, int index,
                                     const u8 *bssid, bool preauth, gfp_t gfp);

/**
 * cfg80211_rx_spurious_frame - inform userspace about a spurious frame
 * @dev: The device the frame matched to
 * @addr: the transmitter address
 * @gfp: context flags
 *
 * This function is used in AP mode (only!) to inform userspace that
 * a spurious class 3 frame was received, to be able to deauth the
 * sender.
 * Return: %true if the frame was passed to userspace (or this failed
 * for a reason other than not having a subscription.)
 */
bool cfg80211_rx_spurious_frame(struct net_device *dev,
                                const u8 *addr, gfp_t gfp);

/**
 * cfg80211_rx_unexpected_4addr_frame - inform about unexpected WDS frame
 * @dev: The device the frame matched to
 * @addr: the transmitter address
 * @gfp: context flags
 *
 * This function is used in AP mode (only!) to inform userspace that
 * an associated station sent a 4addr frame but that wasn't expected.
 * It is allowed and desirable to send this event only once for each
 * station to avoid event flooding.
 * Return: %true if the frame was passed to userspace (or this failed
 * for a reason other than not having a subscription.)
 */
bool cfg80211_rx_unexpected_4addr_frame(struct net_device *dev,
                                        const u8 *addr, gfp_t gfp);

/**
 * cfg80211_probe_status - notify userspace about probe status
 * @dev: the device the probe was sent on
 * @addr: the address of the peer
 * @cookie: the cookie filled in @probe_client previously
 * @acked: indicates whether probe was acked or not
 * @gfp: allocation flags
 */
void cfg80211_probe_status(struct net_device *dev, const u8 *addr,
                           u64 cookie, bool acked, gfp_t gfp);

/**
 * cfg80211_report_obss_beacon - report beacon from other APs
 * @wiphy: The wiphy that received the beacon
 * @frame: the frame
 * @len: length of the frame
 * @freq: frequency the frame was received on
 * @sig_dbm: signal strength in mBm, or 0 if unknown
 *
 * Use this function to report to userspace when a beacon was
 * received. It is not useful to call this when there is no
 * netdev that is in AP/GO mode.
 */
void cfg80211_report_obss_beacon(struct wiphy *wiphy,
                                 const u8 *frame, size_t len,
                                 int freq, int sig_dbm);

/**
 * cfg80211_reg_can_beacon - check if beaconing is allowed
 * @wiphy: the wiphy
 * @chandef: the channel definition
 *
 * Return: %true if there is no secondary channel or the secondary channel(s)
 * can be used for beaconing (i.e. is not a radar channel etc.)
 */
bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
                             struct cfg80211_chan_def *chandef);

/*
 * cfg80211_ch_switch_notify - update wdev channel and notify userspace
 * @dev: the device which switched channels
 * @chandef: the new channel definition
 *
 * Acquires wdev_lock, so must only be called from sleepable driver context!
 */
void cfg80211_ch_switch_notify(struct net_device *dev,
                               struct cfg80211_chan_def *chandef);

/**
 * ieee80211_operating_class_to_band - convert operating class to band
 *
 * @operating_class: the operating class to convert
 * @band: band pointer to fill
 *
 * Returns %true if the conversion was successful, %false otherwise.
 */
bool ieee80211_operating_class_to_band(u8 operating_class,
                                       enum ieee80211_band *band);

/*
 * cfg80211_tdls_oper_request - request userspace to perform TDLS operation
 * @dev: the device on which the operation is requested
 * @peer: the MAC address of the peer device
 * @oper: the requested TDLS operation (NL80211_TDLS_SETUP or
 *      NL80211_TDLS_TEARDOWN)
 * @reason_code: the reason code for teardown request
 * @gfp: allocation flags
 *
 * This function is used to request userspace to perform TDLS operation that
 * requires knowledge of keys, i.e., link setup or teardown when the AP
 * connection uses encryption. This is optional mechanism for the driver to use
 * if it can automatically determine when a TDLS link could be useful (e.g.,
 * based on traffic and signal strength for a peer).
 */
void cfg80211_tdls_oper_request(struct net_device *dev, const u8 *peer,
                                enum nl80211_tdls_operation oper,
                                u16 reason_code, gfp_t gfp);

/*
 * cfg80211_calculate_bitrate - calculate actual bitrate (in 100Kbps units)
 * @rate: given rate_info to calculate bitrate from
 *
 * return 0 if MCS index >= 32
 */
u32 cfg80211_calculate_bitrate(struct rate_info *rate);

/**
 * cfg80211_unregister_wdev - remove the given wdev
 * @wdev: struct wireless_dev to remove
 *
 * Call this function only for wdevs that have no netdev assigned,
 * e.g. P2P Devices. It removes the device from the list so that
 * it can no longer be used. It is necessary to call this function
 * even when cfg80211 requests the removal of the interface by
 * calling the del_virtual_intf() callback. The function must also
 * be called when the driver wishes to unregister the wdev, e.g.
 * when the device is unbound from the driver.
 *
 * Requires the RTNL to be held.
 */
void cfg80211_unregister_wdev(struct wireless_dev *wdev);

/**
 * struct cfg80211_ft_event - FT Information Elements
 * @ies: FT IEs
 * @ies_len: length of the FT IE in bytes
 * @target_ap: target AP's MAC address
 * @ric_ies: RIC IE
 * @ric_ies_len: length of the RIC IE in bytes
 */
struct cfg80211_ft_event_params {
        const u8 *ies;
        size_t ies_len;
        const u8 *target_ap;
        const u8 *ric_ies;
        size_t ric_ies_len;
};

/**
 * cfg80211_ft_event - notify userspace about FT IE and RIC IE
 * @netdev: network device
 * @ft_event: IE information
 */
void cfg80211_ft_event(struct net_device *netdev,
                       struct cfg80211_ft_event_params *ft_event);

/**
 * cfg80211_get_p2p_attr - find and copy a P2P attribute from IE buffer
 * @ies: the input IE buffer
 * @len: the input length
 * @attr: the attribute ID to find
 * @buf: output buffer, can be %NULL if the data isn't needed, e.g.
 *      if the function is only called to get the needed buffer size
 * @bufsize: size of the output buffer
 *
 * The function finds a given P2P attribute in the (vendor) IEs and
 * copies its contents to the given buffer.
 *
 * Return: A negative error code (-%EILSEQ or -%ENOENT) if the data is
 * malformed or the attribute can't be found (respectively), or the
 * length of the found attribute (which can be zero).
 */
int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
                          enum ieee80211_p2p_attr_id attr,
                          u8 *buf, unsigned int bufsize);

/**
 * cfg80211_report_wowlan_wakeup - report wakeup from WoWLAN
 * @wdev: the wireless device reporting the wakeup
 * @wakeup: the wakeup report
 * @gfp: allocation flags
 *
 * This function reports that the given device woke up. If it
 * caused the wakeup, report the reason(s), otherwise you may
 * pass %NULL as the @wakeup parameter to advertise that something
 * else caused the wakeup.
 */
void cfg80211_report_wowlan_wakeup(struct wireless_dev *wdev,
                                   struct cfg80211_wowlan_wakeup *wakeup,
                                   gfp_t gfp);

/**
 * cfg80211_crit_proto_stopped() - indicate critical protocol stopped by driver.
 *
 * @wdev: the wireless device for which critical protocol is stopped.
 * @gfp: allocation flags
 *
 * This function can be called by the driver to indicate it has reverted
 * operation back to normal. One reason could be that the duration given
 * by .crit_proto_start() has expired.
 */
void cfg80211_crit_proto_stopped(struct wireless_dev *wdev, gfp_t gfp);

/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* wiphy_printk helpers, similar to dev_printk */

#define wiphy_printk(level, wiphy, format, args...)             \
        dev_printk(level, &(wiphy)->dev, format, ##args)
#define wiphy_emerg(wiphy, format, args...)                     \
        dev_emerg(&(wiphy)->dev, format, ##args)
#define wiphy_alert(wiphy, format, args...)                     \
        dev_alert(&(wiphy)->dev, format, ##args)
#define wiphy_crit(wiphy, format, args...)                      \
        dev_crit(&(wiphy)->dev, format, ##args)
#define wiphy_err(wiphy, format, args...)                       \
        dev_err(&(wiphy)->dev, format, ##args)
#define wiphy_warn(wiphy, format, args...)                      \
        dev_warn(&(wiphy)->dev, format, ##args)
#define wiphy_notice(wiphy, format, args...)                    \
        dev_notice(&(wiphy)->dev, format, ##args)
#define wiphy_info(wiphy, format, args...)                      \
        dev_info(&(wiphy)->dev, format, ##args)

#define wiphy_debug(wiphy, format, args...)                     \
        wiphy_printk(KERN_DEBUG, wiphy, format, ##args)

#define wiphy_dbg(wiphy, format, args...)                       \
        dev_dbg(&(wiphy)->dev, format, ##args)

#if defined(VERBOSE_DEBUG)
#define wiphy_vdbg      wiphy_dbg
#else
#define wiphy_vdbg(wiphy, format, args...)                              \
({                                                                      \
        if (0)                                                          \
                wiphy_printk(KERN_DEBUG, wiphy, format, ##args);        \
        0;                                                              \
})
#endif

/*
 * wiphy_WARN() acts like wiphy_printk(), but with the key difference
 * of using a WARN/WARN_ON to get the message out, including the
 * file/line information and a backtrace.
 */
#define wiphy_WARN(wiphy, format, args...)                      \
        WARN(1, "wiphy: %s\n" format, wiphy_name(wiphy), ##args);

#endif /* __NET_CFG80211_H */