cfg80211: fix dangling scan request checking

[mirror_ubuntu-bionic-kernel.git] / include / net / cfg80211.h

#ifndef __NET_CFG80211_H
#define __NET_CFG80211_H
/*
 * 802.11 device and configuration interface
 *
 * Copyright 2006-2009  Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/netdevice.h>
#include <linux/debugfs.h>
#include <linux/list.h>
#include <linux/netlink.h>
#include <linux/skbuff.h>
#include <linux/nl80211.h>
#include <linux/if_ether.h>
#include <linux/ieee80211.h>
#include <net/regulatory.h>

/* remove once we remove the wext stuff */
#include <net/iw_handler.h>
#include <linux/wireless.h>


/*
 * wireless hardware capability structures
 */

/**
 * enum ieee80211_band - supported frequency bands
 *
 * The bands are assigned this way because the supported
 * bitrates differ in these bands.
 *
 * @IEEE80211_BAND_2GHZ: 2.4GHz ISM band
 * @IEEE80211_BAND_5GHZ: around 5GHz band (4.9-5.7)
 */
enum ieee80211_band {
        IEEE80211_BAND_2GHZ,
        IEEE80211_BAND_5GHZ,

        /* keep last */
        IEEE80211_NUM_BANDS
};

/**
 * enum ieee80211_channel_flags - channel flags
 *
 * Channel flags set by the regulatory control code.
 *
 * @IEEE80211_CHAN_DISABLED: This channel is disabled.
 * @IEEE80211_CHAN_PASSIVE_SCAN: Only passive scanning is permitted
 *      on this channel.
 * @IEEE80211_CHAN_NO_IBSS: IBSS is not allowed on this channel.
 * @IEEE80211_CHAN_RADAR: Radar detection is required on this channel.
 * @IEEE80211_CHAN_NO_HT40PLUS: extension channel above this channel
 *      is not permitted.
 * @IEEE80211_CHAN_NO_HT40MINUS: extension channel below this channel
 *      is not permitted.
 */
enum ieee80211_channel_flags {
        IEEE80211_CHAN_DISABLED         = 1<<0,
        IEEE80211_CHAN_PASSIVE_SCAN     = 1<<1,
        IEEE80211_CHAN_NO_IBSS          = 1<<2,
        IEEE80211_CHAN_RADAR            = 1<<3,
        IEEE80211_CHAN_NO_HT40PLUS      = 1<<4,
        IEEE80211_CHAN_NO_HT40MINUS     = 1<<5,
};

#define IEEE80211_CHAN_NO_HT40 \
        (IEEE80211_CHAN_NO_HT40PLUS | IEEE80211_CHAN_NO_HT40MINUS)

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

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

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

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

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

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

/**
 * struct vif_params - describes virtual interface parameters
 * @mesh_id: mesh ID to use
 * @mesh_id_len: length of the mesh ID
 */
struct vif_params {
       u8 *mesh_id;
       int mesh_id_len;
};

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

/**
 * struct beacon_parameters - beacon parameters
 *
 * Used to configure the beacon for an interface.
 *
 * @head: head portion of beacon (before TIM IE)
 *     or %NULL if not changed
 * @tail: tail portion of beacon (after TIM IE)
 *     or %NULL if not changed
 * @interval: beacon interval or zero if not changed
 * @dtim_period: DTIM period or zero if not changed
 * @head_len: length of @head
 * @tail_len: length of @tail
 */
struct beacon_parameters {
        u8 *head, *tail;
        int interval, dtim_period;
        int head_len, tail_len;
};

/**
 * enum plink_action - actions to perform in mesh peers
 *
 * @PLINK_ACTION_INVALID: action 0 is reserved
 * @PLINK_ACTION_OPEN: start mesh peer link establishment
 * @PLINK_ACTION_BLOCL: block traffic from this mesh peer
 */
enum plink_actions {
        PLINK_ACTION_INVALID,
        PLINK_ACTION_OPEN,
        PLINK_ACTION_BLOCK,
};

/**
 * struct station_parameters - station parameters
 *
 * Used to change and create a new station.
 *
 * @vlan: vlan interface station should belong to
 * @supported_rates: supported rates in IEEE 802.11 format
 *      (or NULL for no change)
 * @supported_rates_len: number of supported rates
 * @sta_flags_mask: station flags that changed
 *      (bitmask of BIT(NL80211_STA_FLAG_...))
 * @sta_flags_set: station flags values
 *      (bitmask of BIT(NL80211_STA_FLAG_...))
 * @listen_interval: listen interval or -1 for no change
 * @aid: AID or zero for no change
 */
struct station_parameters {
        u8 *supported_rates;
        struct net_device *vlan;
        u32 sta_flags_mask, sta_flags_set;
        int listen_interval;
        u16 aid;
        u8 supported_rates_len;
        u8 plink_action;
        struct ieee80211_ht_cap *ht_capa;
};

/**
 * enum station_info_flags - station information flags
 *
 * Used by the driver to indicate which info in &struct station_info
 * it has filled in during get_station() or dump_station().
 *
 * @STATION_INFO_INACTIVE_TIME: @inactive_time filled
 * @STATION_INFO_RX_BYTES: @rx_bytes filled
 * @STATION_INFO_TX_BYTES: @tx_bytes filled
 * @STATION_INFO_LLID: @llid filled
 * @STATION_INFO_PLID: @plid filled
 * @STATION_INFO_PLINK_STATE: @plink_state filled
 * @STATION_INFO_SIGNAL: @signal filled
 * @STATION_INFO_TX_BITRATE: @tx_bitrate fields are filled
 *  (tx_bitrate, tx_bitrate_flags and tx_bitrate_mcs)
 * @STATION_INFO_RX_PACKETS: @rx_packets filled
 * @STATION_INFO_TX_PACKETS: @tx_packets filled
 */
enum station_info_flags {
        STATION_INFO_INACTIVE_TIME      = 1<<0,
        STATION_INFO_RX_BYTES           = 1<<1,
        STATION_INFO_TX_BYTES           = 1<<2,
        STATION_INFO_LLID               = 1<<3,
        STATION_INFO_PLID               = 1<<4,
        STATION_INFO_PLINK_STATE        = 1<<5,
        STATION_INFO_SIGNAL             = 1<<6,
        STATION_INFO_TX_BITRATE         = 1<<7,
        STATION_INFO_RX_PACKETS         = 1<<8,
        STATION_INFO_TX_PACKETS         = 1<<9,
};

/**
 * enum station_info_rate_flags - bitrate info flags
 *
 * Used by the driver to indicate the specific rate transmission
 * type for 802.11n transmissions.
 *
 * @RATE_INFO_FLAGS_MCS: @tx_bitrate_mcs filled
 * @RATE_INFO_FLAGS_40_MHZ_WIDTH: 40 Mhz width transmission
 * @RATE_INFO_FLAGS_SHORT_GI: 400ns guard interval
 */
enum rate_info_flags {
        RATE_INFO_FLAGS_MCS             = 1<<0,
        RATE_INFO_FLAGS_40_MHZ_WIDTH    = 1<<1,
        RATE_INFO_FLAGS_SHORT_GI        = 1<<2,
};

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

/**
 * struct station_info - station information
 *
 * Station information filled by driver for get_station() and dump_station.
 *
 * @filled: bitflag of flags from &enum station_info_flags
 * @inactive_time: time since last station activity (tx/rx) in milliseconds
 * @rx_bytes: bytes received from this station
 * @tx_bytes: bytes transmitted to this station
 * @llid: mesh local link id
 * @plid: mesh peer link id
 * @plink_state: mesh peer link state
 * @signal: signal strength of last received packet in dBm
 * @txrate: current unicast bitrate to this station
 * @rx_packets: packets received from this station
 * @tx_packets: packets transmitted to this station
 * @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.
 */
struct station_info {
        u32 filled;
        u32 inactive_time;
        u32 rx_bytes;
        u32 tx_bytes;
        u16 llid;
        u16 plid;
        u8 plink_state;
        s8 signal;
        struct rate_info txrate;
        u32 rx_packets;
        u32 tx_packets;

        int generation;
};

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

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

/**
 * struct mpath_info - mesh path information
 *
 * Mesh path information filled by driver for get_mpath() and dump_mpath().
 *
 * @filled: bitfield of flags from &enum mpath_info_flags
 * @frame_qlen: number of queued frames for this destination
 * @dsn: destination sequence number
 * @metric: metric (cost) of this mesh path
 * @exptime: expiration time for the mesh path from now, in msecs
 * @flags: mesh path flags
 * @discovery_timeout: total mesh path discovery timeout, in msecs
 * @discovery_retries: mesh path discovery retries
 * @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 dsn;
        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
 */
struct bss_parameters {
        int use_cts_prot;
        int use_short_preamble;
        int use_short_slot_time;
        u8 *basic_rates;
        u8 basic_rates_len;
};

struct mesh_config {
        /* Timeouts in ms */
        /* Mesh plink management parameters */
        u16 dot11MeshRetryTimeout;
        u16 dot11MeshConfirmTimeout;
        u16 dot11MeshHoldingTimeout;
        u16 dot11MeshMaxPeerLinks;
        u8  dot11MeshMaxRetries;
        u8  dot11MeshTTL;
        bool auto_open_plinks;
        /* HWMP parameters */
        u8  dot11MeshHWMPmaxPREQretries;
        u32 path_refresh_time;
        u16 min_discovery_timeout;
        u32 dot11MeshHWMPactivePathTimeout;
        u16 dot11MeshHWMPpreqMinInterval;
        u16 dot11MeshHWMPnetDiameterTraversalTime;
};

/**
 * struct ieee80211_txq_params - TX queue parameters
 * @queue: TX queue identifier (NL80211_TXQ_Q_*)
 * @txop: Maximum burst time in units of 32 usecs, 0 meaning disabled
 * @cwmin: Minimum contention window [a value of the form 2^n-1 in the range
 *      1..32767]
 * @cwmax: Maximum contention window [a value of the form 2^n-1 in the range
 *      1..32767]
 * @aifs: Arbitration interframe space [0..255]
 */
struct ieee80211_txq_params {
        enum nl80211_txq_q queue;
        u16 txop;
        u16 cwmin;
        u16 cwmax;
        u8 aifs;
};

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

/* from net/ieee80211.h */
struct ieee80211_channel;

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

/**
 * struct cfg80211_scan_request - scan request description
 *
 * @ssids: SSIDs to scan for (active scan only)
 * @n_ssids: number of SSIDs
 * @channels: channels to scan on.
 * @n_channels: 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
 * @wiphy: the wiphy this was for
 * @dev: the interface
 */
struct cfg80211_scan_request {
        struct cfg80211_ssid *ssids;
        int n_ssids;
        u32 n_channels;
        const u8 *ie;
        size_t ie_len;

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

        /* 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 - BSS description
 *
 * This structure describes a BSS (which may also be a mesh network)
 * for use in scan results and similar.
 *
 * @bssid: BSSID of the BSS
 * @tsf: timestamp of last received update
 * @beacon_interval: the beacon interval as from the frame
 * @capability: the capability field in host byte order
 * @information_elements: the information elements (Note that there
 *      is no guarantee that these are well-formed!)
 * @len_information_elements: total length of the information elements
 * @signal: signal strength value (type depends on the wiphy's signal_type)
 * @free_priv: function pointer to free private data
 * @priv: private area for driver use, has at least wiphy->bss_priv_size bytes
 */
struct cfg80211_bss {
        struct ieee80211_channel *channel;

        u8 bssid[ETH_ALEN];
        u64 tsf;
        u16 beacon_interval;
        u16 capability;
        u8 *information_elements;
        size_t len_information_elements;

        s32 signal;

        void (*free_priv)(struct cfg80211_bss *bss);
        u8 priv[0] __attribute__((__aligned__(sizeof(void *))));
};

/**
 * ieee80211_bss_get_ie - find IE with given ID
 * @bss: the bss to search
 * @ie: the IE ID
 * Returns %NULL if not found.
 */
const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie);


/**
 * 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.
 */
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;
};

/**
 * struct cfg80211_auth_request - Authentication request data
 *
 * This structure provides information needed to complete IEEE 802.11
 * authentication.
 *
 * @bss: The BSS to authenticate with.
 * @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
 */
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;
};

/**
 * 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.
 * @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
 */
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;
};

/**
 * struct cfg80211_deauth_request - Deauthentication request data
 *
 * This structure provides information needed to complete IEEE 802.11
 * deauthentication.
 *
 * @bss: 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
 */
struct cfg80211_deauth_request {
        struct cfg80211_bss *bss;
        const u8 *ie;
        size_t ie_len;
        u16 reason_code;
};

/**
 * 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
 */
struct cfg80211_disassoc_request {
        struct cfg80211_bss *bss;
        const u8 *ie;
        size_t ie_len;
        u16 reason_code;
};

/**
 * struct cfg80211_ibss_params - IBSS parameters
 *
 * This structure defines the IBSS parameters for the join_ibss()
 * method.
 *
 * @ssid: The SSID, will always be non-null.
 * @ssid_len: The length of the SSID, will always be non-zero.
 * @bssid: Fixed BSSID requested, maybe be %NULL, if set do not
 *      search for IBSSs with a different BSSID.
 * @channel: The channel to use if no IBSS can be found to join.
 * @channel_fixed: The channel should be fixed -- do not search for
 *      IBSSs to join on other channels.
 * @ie: information element(s) to include in the beacon
 * @ie_len: length of that
 * @beacon_interval: beacon interval to use
 * @privacy: this is a protected network, keys will be configured
 *      after joining
 */
struct cfg80211_ibss_params {
        u8 *ssid;
        u8 *bssid;
        struct ieee80211_channel *channel;
        u8 *ie;
        u8 ssid_len, ie_len;
        u16 beacon_interval;
        bool channel_fixed;
        bool privacy;
};

/**
 * 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)
 * @assoc_ie: IEs for association request
 * @assoc_ie_len: Length of assoc_ie in octets
 * @privacy: indicates whether privacy-enabled APs should be 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
 */
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;
        struct cfg80211_crypto_settings crypto;
        const u8 *key;
        u8 key_len, key_idx;
};

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

/**
 * enum tx_power_setting - TX power adjustment
 *
 * @TX_POWER_AUTOMATIC: the dbm parameter is ignored
 * @TX_POWER_LIMITED: limit TX power by the dbm parameter
 * @TX_POWER_FIXED: fix TX power to the dbm parameter
 */
enum tx_power_setting {
        TX_POWER_AUTOMATIC,
        TX_POWER_LIMITED,
        TX_POWER_FIXED,
};

/*
 * cfg80211_bitrate_mask - masks for bitrate control
 */
struct cfg80211_bitrate_mask {
/*
 * As discussed in Berlin, this struct really
 * should look like this:

        struct {
                u32 legacy;
                u8 mcs[IEEE80211_HT_MCS_MASK_LEN];
        } control[IEEE80211_NUM_BANDS];

 * Since we can always fix in-kernel users, let's keep
 * it simpler for now:
 */
        u32 fixed;   /* fixed bitrate, 0 == not fixed */
        u32 maxrate; /* in kbps, 0 == no limit */
};

/**
 * struct cfg80211_ops - backend description for wireless configuration
 *
 * This struct is registered by fullmac card drivers and/or wireless stacks
 * in order to handle configuration requests on their interfaces.
 *
 * All callbacks except where otherwise noted should return 0
 * on success or a negative error code.
 *
 * All operations are currently invoked under rtnl for consistency with the
 * wireless extensions but this is subject to reevaluation as soon as this
 * code is used more widely and we have a first user without wext.
 *
 * @suspend: wiphy device needs to be suspended
 * @resume: wiphy device needs to be resumed
 *
 * @add_virtual_intf: create a new virtual interface with the given name,
 *      must set the struct wireless_dev's iftype. Beware: You must create
 *      the new netdev in the wiphy's network namespace!
 *
 * @del_virtual_intf: remove the virtual interface determined by ifindex.
 *
 * @change_virtual_intf: change type/configuration of virtual interface,
 *      keep the struct wireless_dev's iftype updated.
 *
 * @add_key: add a key with the given parameters. @mac_addr will be %NULL
 *      when adding a group key.
 *
 * @get_key: get information about the key with the given parameters.
 *      @mac_addr will be %NULL when requesting information for a group
 *      key. All pointers given to the @callback function need not be valid
 *      after it returns. This function should return an error if it is
 *      not possible to retrieve the key, -ENOENT if it doesn't exist.
 *
 * @del_key: remove a key given the @mac_addr (%NULL for a group key)
 *      and @key_index, return -ENOENT if the key doesn't exist.
 *
 * @set_default_key: set the default key on an interface
 *
 * @set_default_mgmt_key: set the default management frame key on an interface
 *
 * @add_beacon: Add a beacon with given parameters, @head, @interval
 *      and @dtim_period will be valid, @tail is optional.
 * @set_beacon: Change the beacon parameters for an access point mode
 *      interface. This should reject the call when no beacon has been
 *      configured.
 * @del_beacon: Remove beacon configuration and stop sending the beacon.
 *
 * @add_station: Add a new station.
 *
 * @del_station: Remove a station; @mac may be NULL to remove all stations.
 *
 * @change_station: Modify a given station.
 *
 * @get_mesh_params: Put the current mesh parameters into *params
 *
 * @set_mesh_params: Set mesh parameters.
 *      The mask is a bitfield which tells us which parameters to
 *      set, and which to leave alone.
 *
 * @set_mesh_cfg: set mesh parameters (by now, just mesh id)
 *
 * @change_bss: Modify parameters for a given BSS.
 *
 * @set_txq_params: Set TX queue parameters
 *
 * @set_channel: Set channel
 *
 * @scan: Request to do a scan. If returning zero, the scan request is given
 *      the driver, and will be valid until passed to cfg80211_scan_done().
 *      For scan results, call cfg80211_inform_bss(); you can call this outside
 *      the scan/scan_done bracket too.
 *
 * @auth: Request to authenticate with the specified peer
 * @assoc: Request to (re)associate with the specified peer
 * @deauth: Request to deauthenticate from the specified peer
 * @disassoc: Request to disassociate from the specified peer
 *
 * @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.
 * @disconnect: Disconnect from the BSS/ESS.
 *
 * @join_ibss: Join the specified IBSS (or create if necessary). Once done, call
 *      cfg80211_ibss_joined(), also call that function when changing BSSID due
 *      to a merge.
 * @leave_ibss: Leave the IBSS.
 *
 * @set_wiphy_params: Notify that wiphy parameters have changed;
 *      @changed bitfield (see &enum wiphy_params_flags) describes which values
 *      have changed. The actual parameter values are available in
 *      struct wiphy. If returning an error, no value should be changed.
 *
 * @set_tx_power: set the transmit power according to the parameters
 * @get_tx_power: store the current TX power into the dbm variable;
 *      return 0 if successful
 *
 * @rfkill_poll: polls the hw rfkill line, use cfg80211 reporting
 *      functions to adjust rfkill hw state
 *
 * @testmode_cmd: run a test mode command
 */
struct cfg80211_ops {
        int     (*suspend)(struct wiphy *wiphy);
        int     (*resume)(struct wiphy *wiphy);

        int     (*add_virtual_intf)(struct wiphy *wiphy, char *name,
                                    enum nl80211_iftype type, u32 *flags,
                                    struct vif_params *params);
        int     (*del_virtual_intf)(struct wiphy *wiphy, struct net_device *dev);
        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, const u8 *mac_addr,
                           struct key_params *params);
        int     (*get_key)(struct wiphy *wiphy, struct net_device *netdev,
                           u8 key_index, const u8 *mac_addr, void *cookie,
                           void (*callback)(void *cookie, struct key_params*));
        int     (*del_key)(struct wiphy *wiphy, struct net_device *netdev,
                           u8 key_index, const u8 *mac_addr);
        int     (*set_default_key)(struct wiphy *wiphy,
                                   struct net_device *netdev,
                                   u8 key_index);
        int     (*set_default_mgmt_key)(struct wiphy *wiphy,
                                        struct net_device *netdev,
                                        u8 key_index);

        int     (*add_beacon)(struct wiphy *wiphy, struct net_device *dev,
                              struct beacon_parameters *info);
        int     (*set_beacon)(struct wiphy *wiphy, struct net_device *dev,
                              struct beacon_parameters *info);
        int     (*del_beacon)(struct wiphy *wiphy, struct net_device *dev);


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

        int     (*add_mpath)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *dst, u8 *next_hop);
        int     (*del_mpath)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *dst);
        int     (*change_mpath)(struct wiphy *wiphy, struct net_device *dev,
                                  u8 *dst, u8 *next_hop);
        int     (*get_mpath)(struct wiphy *wiphy, struct net_device *dev,
                               u8 *dst, u8 *next_hop,
                               struct mpath_info *pinfo);
        int     (*dump_mpath)(struct wiphy *wiphy, struct net_device *dev,
                               int idx, u8 *dst, u8 *next_hop,
                               struct mpath_info *pinfo);
        int     (*get_mesh_params)(struct wiphy *wiphy,
                                struct net_device *dev,
                                struct mesh_config *conf);
        int     (*set_mesh_params)(struct wiphy *wiphy,
                                struct net_device *dev,
                                const struct mesh_config *nconf, u32 mask);
        int     (*change_bss)(struct wiphy *wiphy, struct net_device *dev,
                              struct bss_parameters *params);

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

        int     (*set_channel)(struct wiphy *wiphy,
                               struct ieee80211_channel *chan,
                               enum nl80211_channel_type channel_type);

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

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

        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_wiphy_params)(struct wiphy *wiphy, u32 changed);

        int     (*set_tx_power)(struct wiphy *wiphy,
                                enum tx_power_setting type, int dbm);
        int     (*get_tx_power)(struct wiphy *wiphy, int *dbm);

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

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

#ifdef CONFIG_NL80211_TESTMODE
        int     (*testmode_cmd)(struct wiphy *wiphy, 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);

        /* some temporary stuff to finish wext */
        int     (*set_power_mgmt)(struct wiphy *wiphy, struct net_device *dev,
                                  bool enabled, int timeout);
};

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

/**
 * struct wiphy - wireless hardware description
 * @idx: the wiphy index assigned to this item
 * @class_dev: the class device representing /sys/class/ieee80211/<wiphy-name>
 * @custom_regulatory: tells us the driver for this device
 *      has its own custom regulatory domain and cannot identify the
 *      ISO / IEC 3166 alpha2 it belongs to. When this is enabled
 *      we will disregard the first regulatory hint (when the
 *      initiator is %REGDOM_SET_BY_CORE).
 * @strict_regulatory: tells us the driver for this device will ignore
 *      regulatory domain settings until it gets its own regulatory domain
 *      via its regulatory_hint(). After its gets its own regulatory domain
 *      it will only allow further regulatory domain settings to further
 *      enhance compliance. For example if channel 13 and 14 are disabled
 *      by this regulatory domain no user regulatory domain can enable these
 *      channels at a later time. This can be used for devices which do not
 *      have calibration information gauranteed for frequencies or settings
 *      outside of its regulatory domain.
 * @disable_beacon_hints: enable this if your driver needs to ensure that
 *      passive scan flags and beaconing flags may not be lifted by cfg80211
 *      due to regulatory beacon hints. For more information on beacon
 *      hints read the documenation for regulatory_hint_found_beacon()
 * @reg_notifier: the driver's regulatory notification callback
 * @regd: the driver's regulatory domain, if one was requested via
 *      the regulatory_hint() API. This can be used by the driver
 *      on the reg_notifier() if it chooses to ignore future
 *      regulatory domain changes caused by other drivers.
 * @signal_type: signal type reported in &struct cfg80211_bss.
 * @cipher_suites: supported cipher suites
 * @n_cipher_suites: number of supported cipher suites
 * @retry_short: Retry limit for short frames (dot11ShortRetryLimit)
 * @retry_long: Retry limit for long frames (dot11LongRetryLimit)
 * @frag_threshold: Fragmentation threshold (dot11FragmentationThreshold);
 *      -1 = fragmentation disabled, only odd values >= 256 used
 * @rts_threshold: RTS threshold (dot11RTSThreshold); -1 = RTS/CTS disabled
 * @net: the network namespace this wiphy currently lives in
 * @netnsok: if set to false, do not allow changing the netns of this
 *      wiphy at all
 * @ps_default: default for powersave, 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
 */
struct wiphy {
        /* assign these fields before you register the wiphy */

        /* permanent MAC address */
        u8 perm_addr[ETH_ALEN];

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

        bool custom_regulatory;
        bool strict_regulatory;
        bool disable_beacon_hints;

        bool netnsok;
        bool ps_default;

        enum cfg80211_signal_type signal_type;

        int bss_priv_size;
        u8 max_scan_ssids;
        u16 max_scan_ie_len;

        int n_cipher_suites;
        const u32 *cipher_suites;

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

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

        struct ieee80211_supported_band *bands[IEEE80211_NUM_BANDS];

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

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

        const struct ieee80211_regdomain *regd;

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

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

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

        char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
};

#ifdef CONFIG_NET_NS
static inline struct net *wiphy_net(struct wiphy *wiphy)
{
        return wiphy->_net;
}

static inline void wiphy_net_set(struct wiphy *wiphy, struct net *net)
{
        wiphy->_net = net;
}
#else
static inline struct net *wiphy_net(struct wiphy *wiphy)
{
        return &init_net;
}

static inline void wiphy_net_set(struct wiphy *wiphy, struct net *net)
{
}
#endif

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

/**
 * priv_to_wiphy - return the wiphy containing the priv
 *
 * @priv: a pointer previously returned by wiphy_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
 */
static inline struct device *wiphy_dev(struct wiphy *wiphy)
{
        return wiphy->dev.parent;
}

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

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

/**
 * wiphy_register - register a wiphy with cfg80211
 *
 * @wiphy: The wiphy to register.
 *
 * Returns a non-negative wiphy index or a negative error code.
 */
extern int wiphy_register(struct wiphy *wiphy);

/**
 * wiphy_unregister - deregister a wiphy from cfg80211
 *
 * @wiphy: The wiphy to unregister.
 *
 * After this call, no more requests can be made with this priv
 * pointer, but the call may sleep to wait for an outstanding
 * request that is being handled.
 */
extern void wiphy_unregister(struct wiphy *wiphy);

/**
 * wiphy_free - free wiphy
 *
 * @wiphy: The wiphy to free
 */
extern void wiphy_free(struct wiphy *wiphy);

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

#define MAX_AUTH_BSSES          4

/**
 * struct wireless_dev - wireless per-netdev state
 *
 * This structure must be allocated by the driver/stack
 * that uses the ieee80211_ptr field in struct net_device
 * (this is intentional so it can be allocated along with
 * the netdev.)
 *
 * @wiphy: pointer to hardware description
 * @iftype: interface type
 * @list: (private) Used to collect the interfaces
 * @netdev: (private) Used to reference back to the netdev
 * @current_bss: (private) Used by the internal configuration code
 * @bssid: (private) Used by the internal configuration code
 * @ssid: (private) Used by the internal configuration code
 * @ssid_len: (private) Used by the internal configuration code
 * @wext: (private) Used by the internal wireless extensions compat code
 * @wext_bssid: (private) Used by the internal wireless extensions compat code
 */
struct wireless_dev {
        struct wiphy *wiphy;
        enum nl80211_iftype iftype;

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

        struct mutex mtx;

        struct work_struct cleanup_work;

        /* currently used for IBSS and SME - might be rearranged later */
        u8 ssid[IEEE80211_MAX_SSID_LEN];
        u8 ssid_len;
        enum {
                CFG80211_SME_IDLE,
                CFG80211_SME_CONNECTING,
                CFG80211_SME_CONNECTED,
        } sme_state;
        struct cfg80211_conn *conn;
        struct cfg80211_cached_keys *connect_keys;

        struct list_head event_list;
        spinlock_t event_lock;

        struct cfg80211_internal_bss *authtry_bsses[MAX_AUTH_BSSES];
        struct cfg80211_internal_bss *auth_bsses[MAX_AUTH_BSSES];
        struct cfg80211_internal_bss *current_bss; /* associated / joined */

#ifdef CONFIG_WIRELESS_EXT
        /* 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 ps, prev_bssid_valid;
                int ps_timeout;
        } wext;
#endif
};

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

/*
 * Utility functions
 */

/**
 * ieee80211_channel_to_frequency - convert channel number to frequency
 */
extern int ieee80211_channel_to_frequency(int chan);

/**
 * ieee80211_frequency_to_channel - convert frequency to channel number
 */
extern int ieee80211_frequency_to_channel(int freq);

/*
 * Name indirection necessary because the ieee80211 code also has
 * a function named "ieee80211_get_channel", so if you include
 * cfg80211's header file you get cfg80211's version, if you try
 * to include both header files you'll (rightfully!) get a symbol
 * clash.
 */
extern struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
                                                         int freq);
/**
 * ieee80211_get_channel - get channel struct from wiphy for specified frequency
 */
static inline struct ieee80211_channel *
ieee80211_get_channel(struct wiphy *wiphy, int freq)
{
        return __ieee80211_get_channel(wiphy, freq);
}

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

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

/**
 * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args
 * @rtheader: pointer to the radiotap header we are walking through
 * @max_length: length of radiotap header in cpu byte ordering
 * @this_arg_index: IEEE80211_RADIOTAP_... index of current arg
 * @this_arg: pointer to current radiotap arg
 * @arg_index: internal next argument index
 * @arg: internal next argument pointer
 * @next_bitmap: internal pointer to next present u32
 * @bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present
 */

struct ieee80211_radiotap_iterator {
        struct ieee80211_radiotap_header *rtheader;
        int max_length;
        int this_arg_index;
        u8 *this_arg;

        int arg_index;
        u8 *arg;
        __le32 *next_bitmap;
        u32 bitmap_shifter;
};

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

extern int ieee80211_radiotap_iterator_next(
   struct ieee80211_radiotap_iterator *iterator);

extern const unsigned char rfc1042_header[6];
extern const unsigned char bridge_tunnel_header[6];

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

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

/**
 * ieee80211_data_to_8023 - convert an 802.11 data frame to 802.3
 * @skb: the 802.11 data frame
 * @addr: the device MAC address
 * @iftype: the virtual interface type
 */
int ieee80211_data_to_8023(struct sk_buff *skb, u8 *addr,
                           enum nl80211_iftype iftype);

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

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

/*
 * Regulatory helper functions for wiphys
 */

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

/**
 * wiphy_apply_custom_regulatory - apply a custom driver regulatory domain
 * @wiphy: the wireless device we want to process the regulatory domain on
 * @regd: the custom regulatory domain to use for this wiphy
 *
 * Drivers can sometimes have custom regulatory domains which do not apply
 * to a specific country. Drivers can use this to apply such custom regulatory
 * domains. This routine must be called prior to wiphy registration. The
 * custom regulatory domain will be trusted completely and as such previous
 * default channel settings will be disregarded. If no rule is found for a
 * channel on the regulatory domain the channel will be disabled.
 */
extern void wiphy_apply_custom_regulatory(
        struct wiphy *wiphy,
        const struct ieee80211_regdomain *regd);

/**
 * freq_reg_info - get regulatory information for the given frequency
 * @wiphy: the wiphy for which we want to process this rule for
 * @center_freq: Frequency in KHz for which we want regulatory information for
 * @desired_bw_khz: the desired max bandwidth you want to use per
 *      channel. Note that this is still 20 MHz if you want to use HT40
 *      as HT40 makes use of two channels for its 40 MHz width bandwidth.
 *      If set to 0 we'll assume you want the standard 20 MHz.
 * @reg_rule: the regulatory rule which we have for this frequency
 *
 * Use this function to get the regulatory rule for a specific frequency on
 * a given wireless device. If the device has a specific regulatory domain
 * it wants to follow we respect that unless a country IE has been received
 * and processed already.
 *
 * Returns 0 if it was able to find a valid regulatory rule which does
 * apply to the given center_freq otherwise it returns non-zero. It will
 * also return -ERANGE if we determine the given center_freq does not even have
 * a regulatory rule for a frequency range in the center_freq's band. See
 * freq_in_rule_band() for our current definition of a band -- this is purely
 * subjective and right now its 802.11 specific.
 */
extern int freq_reg_info(struct wiphy *wiphy,
                         u32 center_freq,
                         u32 desired_bw_khz,
                         const struct ieee80211_reg_rule **reg_rule);

/*
 * Temporary wext handlers & helper functions
 *
 * In the future cfg80211 will simply assign the entire wext handler
 * structure to netdevs it manages, but we're not there yet.
 */
int cfg80211_wext_giwname(struct net_device *dev,
                          struct iw_request_info *info,
                          char *name, char *extra);
int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
                          u32 *mode, char *extra);
int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
                          u32 *mode, char *extra);
int cfg80211_wext_siwscan(struct net_device *dev,
                          struct iw_request_info *info,
                          union iwreq_data *wrqu, char *extra);
int cfg80211_wext_giwscan(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_point *data, char *extra);
int cfg80211_wext_siwmlme(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_point *data, char *extra);
int cfg80211_wext_giwrange(struct net_device *dev,
                           struct iw_request_info *info,
                           struct iw_point *data, char *extra);
int cfg80211_wext_siwgenie(struct net_device *dev,
                           struct iw_request_info *info,
                           struct iw_point *data, char *extra);
int cfg80211_wext_siwauth(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_param *data, char *extra);
int cfg80211_wext_giwauth(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_param *data, char *extra);

int cfg80211_wext_siwfreq(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_freq *freq, char *extra);
int cfg80211_wext_giwfreq(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_freq *freq, char *extra);
int cfg80211_wext_siwessid(struct net_device *dev,
                           struct iw_request_info *info,
                           struct iw_point *data, char *ssid);
int cfg80211_wext_giwessid(struct net_device *dev,
                           struct iw_request_info *info,
                           struct iw_point *data, char *ssid);
int cfg80211_wext_siwrate(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_param *rate, char *extra);
int cfg80211_wext_giwrate(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_param *rate, char *extra);

int cfg80211_wext_siwrts(struct net_device *dev,
                         struct iw_request_info *info,
                         struct iw_param *rts, char *extra);
int cfg80211_wext_giwrts(struct net_device *dev,
                         struct iw_request_info *info,
                         struct iw_param *rts, char *extra);
int cfg80211_wext_siwfrag(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_param *frag, char *extra);
int cfg80211_wext_giwfrag(struct net_device *dev,
                          struct iw_request_info *info,
                          struct iw_param *frag, char *extra);
int cfg80211_wext_siwretry(struct net_device *dev,
                           struct iw_request_info *info,
                           struct iw_param *retry, char *extra);
int cfg80211_wext_giwretry(struct net_device *dev,
                           struct iw_request_info *info,
                           struct iw_param *retry, char *extra);
int cfg80211_wext_siwencodeext(struct net_device *dev,
                               struct iw_request_info *info,
                               struct iw_point *erq, char *extra);
int cfg80211_wext_siwencode(struct net_device *dev,
                            struct iw_request_info *info,
                            struct iw_point *erq, char *keybuf);
int cfg80211_wext_giwencode(struct net_device *dev,
                            struct iw_request_info *info,
                            struct iw_point *erq, char *keybuf);
int cfg80211_wext_siwtxpower(struct net_device *dev,
                             struct iw_request_info *info,
                             union iwreq_data *data, char *keybuf);
int cfg80211_wext_giwtxpower(struct net_device *dev,
                             struct iw_request_info *info,
                             union iwreq_data *data, char *keybuf);
struct iw_statistics *cfg80211_wireless_stats(struct net_device *dev);

int cfg80211_wext_siwpower(struct net_device *dev,
                           struct iw_request_info *info,
                           struct iw_param *wrq, char *extra);
int cfg80211_wext_giwpower(struct net_device *dev,
                           struct iw_request_info *info,
                           struct iw_param *wrq, char *extra);

int cfg80211_wext_siwap(struct net_device *dev,
                        struct iw_request_info *info,
                        struct sockaddr *ap_addr, char *extra);
int cfg80211_wext_giwap(struct net_device *dev,
                        struct iw_request_info *info,
                        struct sockaddr *ap_addr, char *extra);

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

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

/**
 * cfg80211_inform_bss - inform cfg80211 of a new BSS
 *
 * @wiphy: the wiphy reporting the BSS
 * @bss: the found BSS
 * @signal: the signal strength, type depends on the wiphy's signal_type
 * @gfp: context flags
 *
 * This informs cfg80211 that BSS information was found and
 * the BSS should be updated/added.
 */
struct cfg80211_bss*
cfg80211_inform_bss_frame(struct wiphy *wiphy,
                          struct ieee80211_channel *channel,
                          struct ieee80211_mgmt *mgmt, size_t len,
                          s32 signal, gfp_t gfp);

struct cfg80211_bss*
cfg80211_inform_bss(struct wiphy *wiphy,
                    struct ieee80211_channel *channel,
                    const u8 *bssid,
                    u64 timestamp, u16 capability, u16 beacon_interval,
                    const u8 *ie, size_t ielen,
                    s32 signal, gfp_t gfp);

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

struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
                                       struct ieee80211_channel *channel,
                                       const u8 *meshid, size_t meshidlen,
                                       const u8 *meshcfg);
void cfg80211_put_bss(struct cfg80211_bss *bss);

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

/**
 * cfg80211_send_rx_auth - notification of processed authentication
 * @dev: network device
 * @buf: authentication frame (header + body)
 * @len: length of the frame data
 *
 * This function is called whenever an authentication has been processed in
 * station mode. The driver is required to call either this function or
 * cfg80211_send_auth_timeout() to indicate the result of cfg80211_ops::auth()
 * call. This function may sleep.
 */
void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len);

/**
 * cfg80211_send_auth_timeout - notification of timed out authentication
 * @dev: network device
 * @addr: The MAC address of the device with which the authentication timed out
 *
 * This function may sleep.
 */
void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr);

/**
 * cfg80211_send_rx_assoc - notification of processed association
 * @dev: network device
 * @buf: (re)association response frame (header + body)
 * @len: length of the frame data
 *
 * This function is called whenever a (re)association response has been
 * processed in station mode. The driver is required to call either this
 * function or cfg80211_send_assoc_timeout() to indicate the result of
 * cfg80211_ops::assoc() call. This function may sleep.
 */
void cfg80211_send_rx_assoc(struct net_device *dev, const u8 *buf, size_t len);

/**
 * cfg80211_send_assoc_timeout - notification of timed out association
 * @dev: network device
 * @addr: The MAC address of the device with which the association timed out
 *
 * This function may sleep.
 */
void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr);

/**
 * cfg80211_send_deauth - notification of processed deauthentication
 * @dev: network device
 * @buf: deauthentication frame (header + body)
 * @len: length of the frame data
 * @cookie: cookie from ->deauth if called within that callback,
 *      %NULL otherwise
 *
 * 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.
 */
void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len,
                          void *cookie);

/**
 * cfg80211_send_disassoc - notification of processed disassociation
 * @dev: network device
 * @buf: disassociation response frame (header + body)
 * @len: length of the frame data
 * @cookie: cookie from ->disassoc if called within that callback,
 *      %NULL otherwise
 *
 * This function is called whenever disassociation has been processed in
 * station mode. This includes both received disassociation frames and locally
 * generated ones. This function may sleep.
 */
void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len,
                            void *cookie);

/**
 * cfg80211_michael_mic_failure - notification of Michael MIC failure (TKIP)
 * @dev: network device
 * @addr: The source MAC address of the frame
 * @key_type: The key type that the received frame used
 * @key_id: Key identifier (0..3)
 * @tsc: The TSC value of the frame that generated the MIC failure (6 octets)
 * @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);

/**
 * 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
/**
 * 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 (or %NULL if any errors happen) 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.
 */
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()
 *
 * Returns an error code or 0 on success, 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.
 */
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 (or %NULL if any errors happen) 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.
 */
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),
#else
#define CFG80211_TESTMODE_CMD(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
 * @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, 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_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);


#endif /* __NET_CFG80211_H */