Pass TDLS peer capability information in tdls_mgmt

[mech_eap.git] / src / drivers / driver.h

/*
 * Driver interface definition
 * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 *
 * This file defines a driver interface used by both %wpa_supplicant and
 * hostapd. The first part of the file defines data structures used in various
 * driver operations. This is followed by the struct wpa_driver_ops that each
 * driver wrapper will beed to define with callback functions for requesting
 * driver operations. After this, there are definitions for driver event
 * reporting with wpa_supplicant_event() and some convenience helper functions
 * that can be used to report events.
 */

#ifndef DRIVER_H
#define DRIVER_H

#define WPA_SUPPLICANT_DRIVER_VERSION 4

#include "common/defs.h"
#include "utils/list.h"

#define HOSTAPD_CHAN_DISABLED 0x00000001
#define HOSTAPD_CHAN_PASSIVE_SCAN 0x00000002
#define HOSTAPD_CHAN_NO_IBSS 0x00000004
#define HOSTAPD_CHAN_RADAR 0x00000008
#define HOSTAPD_CHAN_HT40PLUS 0x00000010
#define HOSTAPD_CHAN_HT40MINUS 0x00000020
#define HOSTAPD_CHAN_HT40 0x00000040
#define HOSTAPD_CHAN_SURVEY_LIST_INITIALIZED 0x00000080

#define HOSTAPD_CHAN_DFS_UNKNOWN 0x00000000
#define HOSTAPD_CHAN_DFS_USABLE 0x00000100
#define HOSTAPD_CHAN_DFS_UNAVAILABLE 0x00000200
#define HOSTAPD_CHAN_DFS_AVAILABLE 0x00000300
#define HOSTAPD_CHAN_DFS_MASK 0x00000300

#define HOSTAPD_CHAN_VHT_10_70 0x00000800
#define HOSTAPD_CHAN_VHT_30_50 0x00001000
#define HOSTAPD_CHAN_VHT_50_30 0x00002000
#define HOSTAPD_CHAN_VHT_70_10 0x00004000

enum reg_change_initiator {
        REGDOM_SET_BY_CORE,
        REGDOM_SET_BY_USER,
        REGDOM_SET_BY_DRIVER,
        REGDOM_SET_BY_COUNTRY_IE,
        REGDOM_BEACON_HINT,
};

/**
 * struct hostapd_channel_data - Channel information
 */
struct hostapd_channel_data {
        /**
         * chan - Channel number (IEEE 802.11)
         */
        short chan;

        /**
         * freq - Frequency in MHz
         */
        int freq;

        /**
         * flag - Channel flags (HOSTAPD_CHAN_*)
         */
        int flag;

        /**
         * max_tx_power - Regulatory transmit power limit in dBm
         */
        u8 max_tx_power;

        /*
         * survey_list - Linked list of surveys
         */
        struct dl_list survey_list;

        /**
         * min_nf - Minimum observed noise floor, in dBm, based on all
         * surveyed channel data
         */
        s8 min_nf;

#ifdef CONFIG_ACS
        /**
         * interference_factor - Computed interference factor on this
         * channel (used internally in src/ap/acs.c; driver wrappers do not
         * need to set this)
         */
        long double interference_factor;
#endif /* CONFIG_ACS */
};

#define HOSTAPD_MODE_FLAG_HT_INFO_KNOWN BIT(0)
#define HOSTAPD_MODE_FLAG_VHT_INFO_KNOWN BIT(1)

/**
 * struct hostapd_hw_modes - Supported hardware mode information
 */
struct hostapd_hw_modes {
        /**
         * mode - Hardware mode
         */
        enum hostapd_hw_mode mode;

        /**
         * num_channels - Number of entries in the channels array
         */
        int num_channels;

        /**
         * channels - Array of supported channels
         */
        struct hostapd_channel_data *channels;

        /**
         * num_rates - Number of entries in the rates array
         */
        int num_rates;

        /**
         * rates - Array of supported rates in 100 kbps units
         */
        int *rates;

        /**
         * ht_capab - HT (IEEE 802.11n) capabilities
         */
        u16 ht_capab;

        /**
         * mcs_set - MCS (IEEE 802.11n) rate parameters
         */
        u8 mcs_set[16];

        /**
         * a_mpdu_params - A-MPDU (IEEE 802.11n) parameters
         */
        u8 a_mpdu_params;

        /**
         * vht_capab - VHT (IEEE 802.11ac) capabilities
         */
        u32 vht_capab;

        /**
         * vht_mcs_set - VHT MCS (IEEE 802.11ac) rate parameters
         */
        u8 vht_mcs_set[8];

        unsigned int flags; /* HOSTAPD_MODE_FLAG_* */
};


#define IEEE80211_MODE_INFRA    0
#define IEEE80211_MODE_IBSS     1
#define IEEE80211_MODE_AP       2

#define IEEE80211_CAP_ESS       0x0001
#define IEEE80211_CAP_IBSS      0x0002
#define IEEE80211_CAP_PRIVACY   0x0010

/* DMG (60 GHz) IEEE 802.11ad */
/* type - bits 0..1 */
#define IEEE80211_CAP_DMG_MASK  0x0003
#define IEEE80211_CAP_DMG_IBSS  0x0001 /* Tx by: STA */
#define IEEE80211_CAP_DMG_PBSS  0x0002 /* Tx by: PCP */
#define IEEE80211_CAP_DMG_AP    0x0003 /* Tx by: AP */

#define WPA_SCAN_QUAL_INVALID           BIT(0)
#define WPA_SCAN_NOISE_INVALID          BIT(1)
#define WPA_SCAN_LEVEL_INVALID          BIT(2)
#define WPA_SCAN_LEVEL_DBM              BIT(3)
#define WPA_SCAN_AUTHENTICATED          BIT(4)
#define WPA_SCAN_ASSOCIATED             BIT(5)

/**
 * struct wpa_scan_res - Scan result for an BSS/IBSS
 * @flags: information flags about the BSS/IBSS (WPA_SCAN_*)
 * @bssid: BSSID
 * @freq: frequency of the channel in MHz (e.g., 2412 = channel 1)
 * @beacon_int: beacon interval in TUs (host byte order)
 * @caps: capability information field in host byte order
 * @qual: signal quality
 * @noise: noise level
 * @level: signal level
 * @tsf: Timestamp
 * @age: Age of the information in milliseconds (i.e., how many milliseconds
 * ago the last Beacon or Probe Response frame was received)
 * @ie_len: length of the following IE field in octets
 * @beacon_ie_len: length of the following Beacon IE field in octets
 *
 * This structure is used as a generic format for scan results from the
 * driver. Each driver interface implementation is responsible for converting
 * the driver or OS specific scan results into this format.
 *
 * If the driver does not support reporting all IEs, the IE data structure is
 * constructed of the IEs that are available. This field will also need to
 * include SSID in IE format. All drivers are encouraged to be extended to
 * report all IEs to make it easier to support future additions.
 */
struct wpa_scan_res {
        unsigned int flags;
        u8 bssid[ETH_ALEN];
        int freq;
        u16 beacon_int;
        u16 caps;
        int qual;
        int noise;
        int level;
        u64 tsf;
        unsigned int age;
        size_t ie_len;
        size_t beacon_ie_len;
        /*
         * Followed by ie_len octets of IEs from Probe Response frame (or if
         * the driver does not indicate source of IEs, these may also be from
         * Beacon frame). After the first set of IEs, another set of IEs may
         * follow (with beacon_ie_len octets of data) if the driver provides
         * both IE sets.
         */
};

/**
 * struct wpa_scan_results - Scan results
 * @res: Array of pointers to allocated variable length scan result entries
 * @num: Number of entries in the scan result array
 * @fetch_time: Time when the results were fetched from the driver
 */
struct wpa_scan_results {
        struct wpa_scan_res **res;
        size_t num;
        struct os_reltime fetch_time;
};

/**
 * struct wpa_interface_info - Network interface information
 * @next: Pointer to the next interface or NULL if this is the last one
 * @ifname: Interface name that can be used with init() or init2()
 * @desc: Human readable adapter description (e.g., vendor/model) or NULL if
 *      not available
 * @drv_name: struct wpa_driver_ops::name (note: unlike other strings, this one
 *      is not an allocated copy, i.e., get_interfaces() caller will not free
 *      this)
 */
struct wpa_interface_info {
        struct wpa_interface_info *next;
        char *ifname;
        char *desc;
        const char *drv_name;
};

#define WPAS_MAX_SCAN_SSIDS 16

/**
 * struct wpa_driver_scan_params - Scan parameters
 * Data for struct wpa_driver_ops::scan2().
 */
struct wpa_driver_scan_params {
        /**
         * ssids - SSIDs to scan for
         */
        struct wpa_driver_scan_ssid {
                /**
                 * ssid - specific SSID to scan for (ProbeReq)
                 * %NULL or zero-length SSID is used to indicate active scan
                 * with wildcard SSID.
                 */
                const u8 *ssid;
                /**
                 * ssid_len: Length of the SSID in octets
                 */
                size_t ssid_len;
        } ssids[WPAS_MAX_SCAN_SSIDS];

        /**
         * num_ssids - Number of entries in ssids array
         * Zero indicates a request for a passive scan.
         */
        size_t num_ssids;

        /**
         * extra_ies - Extra IE(s) to add into Probe Request or %NULL
         */
        const u8 *extra_ies;

        /**
         * extra_ies_len - Length of extra_ies in octets
         */
        size_t extra_ies_len;

        /**
         * freqs - Array of frequencies to scan or %NULL for all frequencies
         *
         * The frequency is set in MHz. The array is zero-terminated.
         */
        int *freqs;

        /**
         * filter_ssids - Filter for reporting SSIDs
         *
         * This optional parameter can be used to request the driver wrapper to
         * filter scan results to include only the specified SSIDs. %NULL
         * indicates that no filtering is to be done. This can be used to
         * reduce memory needs for scan results in environments that have large
         * number of APs with different SSIDs.
         *
         * The driver wrapper is allowed to take this allocated buffer into its
         * own use by setting the pointer to %NULL. In that case, the driver
         * wrapper is responsible for freeing the buffer with os_free() once it
         * is not needed anymore.
         */
        struct wpa_driver_scan_filter {
                u8 ssid[32];
                size_t ssid_len;
        } *filter_ssids;

        /**
         * num_filter_ssids - Number of entries in filter_ssids array
         */
        size_t num_filter_ssids;

        /**
         * filter_rssi - Filter by RSSI
         *
         * The driver may filter scan results in firmware to reduce host
         * wakeups and thereby save power. Specify the RSSI threshold in s32
         * dBm.
         */
        s32 filter_rssi;

        /**
         * p2p_probe - Used to disable CCK (802.11b) rates for P2P probes
         *
         * When set, the driver is expected to remove rates 1, 2, 5.5, and 11
         * Mbps from the support rates element(s) in the Probe Request frames
         * and not to transmit the frames at any of those rates.
         */
        u8 p2p_probe;

        /**
         * only_new_results - Request driver to report only new results
         *
         * This is used to request the driver to report only BSSes that have
         * been detected after this scan request has been started, i.e., to
         * flush old cached BSS entries.
         */
        int only_new_results;

        /*
         * NOTE: Whenever adding new parameters here, please make sure
         * wpa_scan_clone_params() and wpa_scan_free_params() get updated with
         * matching changes.
         */
};

/**
 * struct wpa_driver_auth_params - Authentication parameters
 * Data for struct wpa_driver_ops::authenticate().
 */
struct wpa_driver_auth_params {
        int freq;
        const u8 *bssid;
        const u8 *ssid;
        size_t ssid_len;
        int auth_alg;
        const u8 *ie;
        size_t ie_len;
        const u8 *wep_key[4];
        size_t wep_key_len[4];
        int wep_tx_keyidx;
        int local_state_change;

        /**
         * p2p - Whether this connection is a P2P group
         */
        int p2p;

        const u8 *sae_data;
        size_t sae_data_len;

};

enum wps_mode {
        WPS_MODE_NONE /* no WPS provisioning being used */,
        WPS_MODE_OPEN /* WPS provisioning with AP that is in open mode */,
        WPS_MODE_PRIVACY /* WPS provisioning with AP that is using protection
                          */
};

/**
 * struct wpa_driver_associate_params - Association parameters
 * Data for struct wpa_driver_ops::associate().
 */
struct wpa_driver_associate_params {
        /**
         * bssid - BSSID of the selected AP
         * This can be %NULL, if ap_scan=2 mode is used and the driver is
         * responsible for selecting with which BSS to associate. */
        const u8 *bssid;

        /**
         * bssid_hint - BSSID of a proposed AP
         *
         * This indicates which BSS has been found a suitable candidate for
         * initial association for drivers that use driver/firmwate-based BSS
         * selection. Unlike the @bssid parameter, @bssid_hint does not limit
         * the driver from selecting other BSSes in the ESS.
         */
        const u8 *bssid_hint;

        /**
         * ssid - The selected SSID
         */
        const u8 *ssid;

        /**
         * ssid_len - Length of the SSID (1..32)
         */
        size_t ssid_len;

        /**
         * freq - Frequency of the channel the selected AP is using
         * Frequency that the selected AP is using (in MHz as
         * reported in the scan results)
         */
        int freq;

        /**
         * freq_hint - Frequency of the channel the proposed AP is using
         *
         * This provides a channel on which a suitable BSS has been found as a
         * hint for the driver. Unlike the @freq parameter, @freq_hint does not
         * limit the driver from selecting other channels for
         * driver/firmware-based BSS selection.
         */
        int freq_hint;

        /**
         * bg_scan_period - Background scan period in seconds, 0 to disable
         * background scan, or -1 to indicate no change to default driver
         * configuration
         */
        int bg_scan_period;

        /**
         * beacon_int - Beacon interval for IBSS or 0 to use driver default
         */
        int beacon_int;

        /**
         * wpa_ie - WPA information element for (Re)Association Request
         * WPA information element to be included in (Re)Association
         * Request (including information element id and length). Use
         * of this WPA IE is optional. If the driver generates the WPA
         * IE, it can use pairwise_suite, group_suite, and
         * key_mgmt_suite to select proper algorithms. In this case,
         * the driver has to notify wpa_supplicant about the used WPA
         * IE by generating an event that the interface code will
         * convert into EVENT_ASSOCINFO data (see below).
         *
         * When using WPA2/IEEE 802.11i, wpa_ie is used for RSN IE
         * instead. The driver can determine which version is used by
         * looking at the first byte of the IE (0xdd for WPA, 0x30 for
         * WPA2/RSN).
         *
         * When using WPS, wpa_ie is used for WPS IE instead of WPA/RSN IE.
         */
        const u8 *wpa_ie;

        /**
         * wpa_ie_len - length of the wpa_ie
         */
        size_t wpa_ie_len;

        /**
         * wpa_proto - Bitfield of WPA_PROTO_* values to indicate WPA/WPA2
         */
        unsigned int wpa_proto;

        /**
         * pairwise_suite - Selected pairwise cipher suite (WPA_CIPHER_*)
         *
         * This is usually ignored if @wpa_ie is used.
         */
        unsigned int pairwise_suite;

        /**
         * group_suite - Selected group cipher suite (WPA_CIPHER_*)
         *
         * This is usually ignored if @wpa_ie is used.
         */
        unsigned int group_suite;

        /**
         * key_mgmt_suite - Selected key management suite (WPA_KEY_MGMT_*)
         *
         * This is usually ignored if @wpa_ie is used.
         */
        unsigned int key_mgmt_suite;

        /**
         * auth_alg - Allowed authentication algorithms
         * Bit field of WPA_AUTH_ALG_*
         */
        int auth_alg;

        /**
         * mode - Operation mode (infra/ibss) IEEE80211_MODE_*
         */
        int mode;

        /**
         * wep_key - WEP keys for static WEP configuration
         */
        const u8 *wep_key[4];

        /**
         * wep_key_len - WEP key length for static WEP configuration
         */
        size_t wep_key_len[4];

        /**
         * wep_tx_keyidx - WEP TX key index for static WEP configuration
         */
        int wep_tx_keyidx;

        /**
         * mgmt_frame_protection - IEEE 802.11w management frame protection
         */
        enum mfp_options mgmt_frame_protection;

        /**
         * ft_ies - IEEE 802.11r / FT information elements
         * If the supplicant is using IEEE 802.11r (FT) and has the needed keys
         * for fast transition, this parameter is set to include the IEs that
         * are to be sent in the next FT Authentication Request message.
         * update_ft_ies() handler is called to update the IEs for further
         * FT messages in the sequence.
         *
         * The driver should use these IEs only if the target AP is advertising
         * the same mobility domain as the one included in the MDIE here.
         *
         * In ap_scan=2 mode, the driver can use these IEs when moving to a new
         * AP after the initial association. These IEs can only be used if the
         * target AP is advertising support for FT and is using the same MDIE
         * and SSID as the current AP.
         *
         * The driver is responsible for reporting the FT IEs received from the
         * AP's response using wpa_supplicant_event() with EVENT_FT_RESPONSE
         * type. update_ft_ies() handler will then be called with the FT IEs to
         * include in the next frame in the authentication sequence.
         */
        const u8 *ft_ies;

        /**
         * ft_ies_len - Length of ft_ies in bytes
         */
        size_t ft_ies_len;

        /**
         * ft_md - FT Mobility domain (6 octets) (also included inside ft_ies)
         *
         * This value is provided to allow the driver interface easier access
         * to the current mobility domain. This value is set to %NULL if no
         * mobility domain is currently active.
         */
        const u8 *ft_md;

        /**
         * passphrase - RSN passphrase for PSK
         *
         * This value is made available only for WPA/WPA2-Personal (PSK) and
         * only for drivers that set WPA_DRIVER_FLAGS_4WAY_HANDSHAKE. This is
         * the 8..63 character ASCII passphrase, if available. Please note that
         * this can be %NULL if passphrase was not used to generate the PSK. In
         * that case, the psk field must be used to fetch the PSK.
         */
        const char *passphrase;

        /**
         * psk - RSN PSK (alternative for passphrase for PSK)
         *
         * This value is made available only for WPA/WPA2-Personal (PSK) and
         * only for drivers that set WPA_DRIVER_FLAGS_4WAY_HANDSHAKE. This is
         * the 32-octet (256-bit) PSK, if available. The driver wrapper should
         * be prepared to handle %NULL value as an error.
         */
        const u8 *psk;

        /**
         * drop_unencrypted - Enable/disable unencrypted frame filtering
         *
         * Configure the driver to drop all non-EAPOL frames (both receive and
         * transmit paths). Unencrypted EAPOL frames (ethertype 0x888e) must
         * still be allowed for key negotiation.
         */
        int drop_unencrypted;

        /**
         * prev_bssid - Previously used BSSID in this ESS
         *
         * When not %NULL, this is a request to use reassociation instead of
         * association.
         */
        const u8 *prev_bssid;

        /**
         * wps - WPS mode
         *
         * If the driver needs to do special configuration for WPS association,
         * this variable provides more information on what type of association
         * is being requested. Most drivers should not need ot use this.
         */
        enum wps_mode wps;

        /**
         * p2p - Whether this connection is a P2P group
         */
        int p2p;

        /**
         * uapsd - UAPSD parameters for the network
         * -1 = do not change defaults
         * AP mode: 1 = enabled, 0 = disabled
         * STA mode: bits 0..3 UAPSD enabled for VO,VI,BK,BE
         */
        int uapsd;

        /**
         * fixed_bssid - Whether to force this BSSID in IBSS mode
         * 1 = Fix this BSSID and prevent merges.
         * 0 = Do not fix BSSID.
         */
        int fixed_bssid;

        /**
         * disable_ht - Disable HT (IEEE 802.11n) for this connection
         */
        int disable_ht;

        /**
         * HT Capabilities over-rides. Only bits set in the mask will be used,
         * and not all values are used by the kernel anyway. Currently, MCS,
         * MPDU and MSDU fields are used.
         */
        const u8 *htcaps;       /* struct ieee80211_ht_capabilities * */
        const u8 *htcaps_mask;  /* struct ieee80211_ht_capabilities * */

#ifdef CONFIG_VHT_OVERRIDES
        /**
         * disable_vht - Disable VHT for this connection
         */
        int disable_vht;

        /**
         * VHT capability overrides.
         */
        const struct ieee80211_vht_capabilities *vhtcaps;
        const struct ieee80211_vht_capabilities *vhtcaps_mask;
#endif /* CONFIG_VHT_OVERRIDES */
};

enum hide_ssid {
        NO_SSID_HIDING,
        HIDDEN_SSID_ZERO_LEN,
        HIDDEN_SSID_ZERO_CONTENTS
};

struct wpa_driver_ap_params {
        /**
         * head - Beacon head from IEEE 802.11 header to IEs before TIM IE
         */
        u8 *head;

        /**
         * head_len - Length of the head buffer in octets
         */
        size_t head_len;

        /**
         * tail - Beacon tail following TIM IE
         */
        u8 *tail;

        /**
         * tail_len - Length of the tail buffer in octets
         */
        size_t tail_len;

        /**
         * dtim_period - DTIM period
         */
        int dtim_period;

        /**
         * beacon_int - Beacon interval
         */
        int beacon_int;

        /**
         * basic_rates: -1 terminated array of basic rates in 100 kbps
         *
         * This parameter can be used to set a specific basic rate set for the
         * BSS. If %NULL, default basic rate set is used.
         */
        int *basic_rates;

        /**
         * proberesp - Probe Response template
         *
         * This is used by drivers that reply to Probe Requests internally in
         * AP mode and require the full Probe Response template.
         */
        u8 *proberesp;

        /**
         * proberesp_len - Length of the proberesp buffer in octets
         */
        size_t proberesp_len;

        /**
         * ssid - The SSID to use in Beacon/Probe Response frames
         */
        const u8 *ssid;

        /**
         * ssid_len - Length of the SSID (1..32)
         */
        size_t ssid_len;

        /**
         * hide_ssid - Whether to hide the SSID
         */
        enum hide_ssid hide_ssid;

        /**
         * pairwise_ciphers - WPA_CIPHER_* bitfield
         */
        unsigned int pairwise_ciphers;

        /**
         * group_cipher - WPA_CIPHER_*
         */
        unsigned int group_cipher;

        /**
         * key_mgmt_suites - WPA_KEY_MGMT_* bitfield
         */
        unsigned int key_mgmt_suites;

        /**
         * auth_algs - WPA_AUTH_ALG_* bitfield
         */
        unsigned int auth_algs;

        /**
         * wpa_version - WPA_PROTO_* bitfield
         */
        unsigned int wpa_version;

        /**
         * privacy - Whether privacy is used in the BSS
         */
        int privacy;

        /**
         * beacon_ies - WPS/P2P IE(s) for Beacon frames
         *
         * This is used to add IEs like WPS IE and P2P IE by drivers that do
         * not use the full Beacon template.
         */
        const struct wpabuf *beacon_ies;

        /**
         * proberesp_ies - P2P/WPS IE(s) for Probe Response frames
         *
         * This is used to add IEs like WPS IE and P2P IE by drivers that
         * reply to Probe Request frames internally.
         */
        const struct wpabuf *proberesp_ies;

        /**
         * assocresp_ies - WPS IE(s) for (Re)Association Response frames
         *
         * This is used to add IEs like WPS IE by drivers that reply to
         * (Re)Association Request frames internally.
         */
        const struct wpabuf *assocresp_ies;

        /**
         * isolate - Whether to isolate frames between associated stations
         *
         * If this is non-zero, the AP is requested to disable forwarding of
         * frames between associated stations.
         */
        int isolate;

        /**
         * cts_protect - Whether CTS protection is enabled
         */
        int cts_protect;

        /**
         * preamble - Whether short preamble is enabled
         */
        int preamble;

        /**
         * short_slot_time - Whether short slot time is enabled
         *
         * 0 = short slot time disable, 1 = short slot time enabled, -1 = do
         * not set (e.g., when 802.11g mode is not in use)
         */
        int short_slot_time;

        /**
         * ht_opmode - HT operation mode or -1 if HT not in use
         */
        int ht_opmode;

        /**
         * interworking - Whether Interworking is enabled
         */
        int interworking;

        /**
         * hessid - Homogeneous ESS identifier or %NULL if not set
         */
        const u8 *hessid;

        /**
         * access_network_type - Access Network Type (0..15)
         *
         * This is used for filtering Probe Request frames when Interworking is
         * enabled.
         */
        u8 access_network_type;

        /**
         * ap_max_inactivity - Timeout in seconds to detect STA's inactivity
         *
         * This is used by driver which advertises this capability.
         */
        int ap_max_inactivity;

        /**
         * disable_dgaf - Whether group-addressed frames are disabled
         */
        int disable_dgaf;

        /**
         * osen - Whether OSEN security is enabled
         */
        int osen;
};

/**
 * struct wpa_driver_capa - Driver capability information
 */
struct wpa_driver_capa {
#define WPA_DRIVER_CAPA_KEY_MGMT_WPA            0x00000001
#define WPA_DRIVER_CAPA_KEY_MGMT_WPA2           0x00000002
#define WPA_DRIVER_CAPA_KEY_MGMT_WPA_PSK        0x00000004
#define WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK       0x00000008
#define WPA_DRIVER_CAPA_KEY_MGMT_WPA_NONE       0x00000010
#define WPA_DRIVER_CAPA_KEY_MGMT_FT             0x00000020
#define WPA_DRIVER_CAPA_KEY_MGMT_FT_PSK         0x00000040
#define WPA_DRIVER_CAPA_KEY_MGMT_WAPI_PSK       0x00000080
        unsigned int key_mgmt;

#define WPA_DRIVER_CAPA_ENC_WEP40       0x00000001
#define WPA_DRIVER_CAPA_ENC_WEP104      0x00000002
#define WPA_DRIVER_CAPA_ENC_TKIP        0x00000004
#define WPA_DRIVER_CAPA_ENC_CCMP        0x00000008
#define WPA_DRIVER_CAPA_ENC_WEP128      0x00000010
#define WPA_DRIVER_CAPA_ENC_GCMP        0x00000020
#define WPA_DRIVER_CAPA_ENC_GCMP_256    0x00000040
#define WPA_DRIVER_CAPA_ENC_CCMP_256    0x00000080
#define WPA_DRIVER_CAPA_ENC_BIP         0x00000100
#define WPA_DRIVER_CAPA_ENC_BIP_GMAC_128        0x00000200
#define WPA_DRIVER_CAPA_ENC_BIP_GMAC_256        0x00000400
#define WPA_DRIVER_CAPA_ENC_BIP_CMAC_256        0x00000800
#define WPA_DRIVER_CAPA_ENC_GTK_NOT_USED        0x00001000
        unsigned int enc;

#define WPA_DRIVER_AUTH_OPEN            0x00000001
#define WPA_DRIVER_AUTH_SHARED          0x00000002
#define WPA_DRIVER_AUTH_LEAP            0x00000004
        unsigned int auth;

/* Driver generated WPA/RSN IE */
#define WPA_DRIVER_FLAGS_DRIVER_IE      0x00000001
/* Driver needs static WEP key setup after association command */
#define WPA_DRIVER_FLAGS_SET_KEYS_AFTER_ASSOC 0x00000002
/* Driver takes care of all DFS operations */
#define WPA_DRIVER_FLAGS_DFS_OFFLOAD                    0x00000004
/* Driver takes care of RSN 4-way handshake internally; PMK is configured with
 * struct wpa_driver_ops::set_key using alg = WPA_ALG_PMK */
#define WPA_DRIVER_FLAGS_4WAY_HANDSHAKE 0x00000008
#define WPA_DRIVER_FLAGS_WIRED          0x00000010
/* Driver provides separate commands for authentication and association (SME in
 * wpa_supplicant). */
#define WPA_DRIVER_FLAGS_SME            0x00000020
/* Driver supports AP mode */
#define WPA_DRIVER_FLAGS_AP             0x00000040
/* Driver needs static WEP key setup after association has been completed */
#define WPA_DRIVER_FLAGS_SET_KEYS_AFTER_ASSOC_DONE      0x00000080
/* unused: 0x00000100 */
/* Driver supports concurrent P2P operations */
#define WPA_DRIVER_FLAGS_P2P_CONCURRENT 0x00000200
/*
 * Driver uses the initial interface as a dedicated management interface, i.e.,
 * it cannot be used for P2P group operations or non-P2P purposes.
 */
#define WPA_DRIVER_FLAGS_P2P_DEDICATED_INTERFACE        0x00000400
/* This interface is P2P capable (P2P GO or P2P Client) */
#define WPA_DRIVER_FLAGS_P2P_CAPABLE    0x00000800
/* Driver supports station and key removal when stopping an AP */
#define WPA_DRIVER_FLAGS_AP_TEARDOWN_SUPPORT            0x00001000
/*
 * Driver uses the initial interface for P2P management interface and non-P2P
 * purposes (e.g., connect to infra AP), but this interface cannot be used for
 * P2P group operations.
 */
#define WPA_DRIVER_FLAGS_P2P_MGMT_AND_NON_P2P           0x00002000
/*
 * Driver is known to use sane error codes, i.e., when it indicates that
 * something (e.g., association) fails, there was indeed a failure and the
 * operation does not end up getting completed successfully later.
 */
#define WPA_DRIVER_FLAGS_SANE_ERROR_CODES               0x00004000
/* Driver supports off-channel TX */
#define WPA_DRIVER_FLAGS_OFFCHANNEL_TX                  0x00008000
/* Driver indicates TX status events for EAPOL Data frames */
#define WPA_DRIVER_FLAGS_EAPOL_TX_STATUS                0x00010000
/* Driver indicates TX status events for Deauth/Disassoc frames */
#define WPA_DRIVER_FLAGS_DEAUTH_TX_STATUS               0x00020000
/* Driver supports roaming (BSS selection) in firmware */
#define WPA_DRIVER_FLAGS_BSS_SELECTION                  0x00040000
/* Driver supports operating as a TDLS peer */
#define WPA_DRIVER_FLAGS_TDLS_SUPPORT                   0x00080000
/* Driver requires external TDLS setup/teardown/discovery */
#define WPA_DRIVER_FLAGS_TDLS_EXTERNAL_SETUP            0x00100000
/* Driver indicates support for Probe Response offloading in AP mode */
#define WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD             0x00200000
/* Driver supports U-APSD in AP mode */
#define WPA_DRIVER_FLAGS_AP_UAPSD                       0x00400000
/* Driver supports inactivity timer in AP mode */
#define WPA_DRIVER_FLAGS_INACTIVITY_TIMER               0x00800000
/* Driver expects user space implementation of MLME in AP mode */
#define WPA_DRIVER_FLAGS_AP_MLME                        0x01000000
/* Driver supports SAE with user space SME */
#define WPA_DRIVER_FLAGS_SAE                            0x02000000
/* Driver makes use of OBSS scan mechanism in wpa_supplicant */
#define WPA_DRIVER_FLAGS_OBSS_SCAN                      0x04000000
/* Driver supports IBSS (Ad-hoc) mode */
#define WPA_DRIVER_FLAGS_IBSS                           0x08000000
/* Driver supports radar detection */
#define WPA_DRIVER_FLAGS_RADAR                          0x10000000
/* Driver supports a dedicated interface for P2P Device */
#define WPA_DRIVER_FLAGS_DEDICATED_P2P_DEVICE           0x20000000
/* Driver supports QoS Mapping */
#define WPA_DRIVER_FLAGS_QOS_MAPPING                    0x40000000
/* Driver supports CSA in AP mode */
#define WPA_DRIVER_FLAGS_AP_CSA                         0x80000000
        unsigned int flags;

        int max_scan_ssids;
        int max_sched_scan_ssids;
        int sched_scan_supported;
        int max_match_sets;

        /**
         * max_remain_on_chan - Maximum remain-on-channel duration in msec
         */
        unsigned int max_remain_on_chan;

        /**
         * max_stations - Maximum number of associated stations the driver
         * supports in AP mode
         */
        unsigned int max_stations;

        /**
         * probe_resp_offloads - Bitmap of supported protocols by the driver
         * for Probe Response offloading.
         */
/* Driver Probe Response offloading support for WPS ver. 1 */
#define WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS               0x00000001
/* Driver Probe Response offloading support for WPS ver. 2 */
#define WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2              0x00000002
/* Driver Probe Response offloading support for P2P */
#define WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P               0x00000004
/* Driver Probe Response offloading support for IEEE 802.11u (Interworking) */
#define WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING      0x00000008
        unsigned int probe_resp_offloads;

        unsigned int max_acl_mac_addrs;

        /**
         * Number of supported concurrent channels
         */
        unsigned int num_multichan_concurrent;

        /**
         * extended_capa - extended capabilities in driver/device
         *
         * Must be allocated and freed by driver and the pointers must be
         * valid for the lifetime of the driver, i.e., freed in deinit()
         */
        const u8 *extended_capa, *extended_capa_mask;
        unsigned int extended_capa_len;
};


struct hostapd_data;

struct hostap_sta_driver_data {
        unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes;
        unsigned long current_tx_rate;
        unsigned long inactive_msec;
        unsigned long flags;
        unsigned long num_ps_buf_frames;
        unsigned long tx_retry_failed;
        unsigned long tx_retry_count;
        int last_rssi;
        int last_ack_rssi;
};

struct hostapd_sta_add_params {
        const u8 *addr;
        u16 aid;
        u16 capability;
        const u8 *supp_rates;
        size_t supp_rates_len;
        u16 listen_interval;
        const struct ieee80211_ht_capabilities *ht_capabilities;
        const struct ieee80211_vht_capabilities *vht_capabilities;
        int vht_opmode_enabled;
        u8 vht_opmode;
        u32 flags; /* bitmask of WPA_STA_* flags */
        int set; /* Set STA parameters instead of add */
        u8 qosinfo;
        const u8 *ext_capab;
        size_t ext_capab_len;
        const u8 *supp_channels;
        size_t supp_channels_len;
        const u8 *supp_oper_classes;
        size_t supp_oper_classes_len;
};

struct hostapd_freq_params {
        int mode;
        int freq;
        int channel;
        /* for HT */
        int ht_enabled;
        int sec_channel_offset; /* 0 = HT40 disabled, -1 = HT40 enabled,
                                 * secondary channel below primary, 1 = HT40
                                 * enabled, secondary channel above primary */

        /* for VHT */
        int vht_enabled;

        /* valid for both HT and VHT, center_freq2 is non-zero
         * only for bandwidth 80 and an 80+80 channel */
        int center_freq1, center_freq2;
        int bandwidth;
};

struct mac_address {
        u8 addr[ETH_ALEN];
};

struct hostapd_acl_params {
        u8 acl_policy;
        unsigned int num_mac_acl;
        struct mac_address mac_acl[0];
};

enum wpa_driver_if_type {
        /**
         * WPA_IF_STATION - Station mode interface
         */
        WPA_IF_STATION,

        /**
         * WPA_IF_AP_VLAN - AP mode VLAN interface
         *
         * This interface shares its address and Beacon frame with the main
         * BSS.
         */
        WPA_IF_AP_VLAN,

        /**
         * WPA_IF_AP_BSS - AP mode BSS interface
         *
         * This interface has its own address and Beacon frame.
         */
        WPA_IF_AP_BSS,

        /**
         * WPA_IF_P2P_GO - P2P Group Owner
         */
        WPA_IF_P2P_GO,

        /**
         * WPA_IF_P2P_CLIENT - P2P Client
         */
        WPA_IF_P2P_CLIENT,

        /**
         * WPA_IF_P2P_GROUP - P2P Group interface (will become either
         * WPA_IF_P2P_GO or WPA_IF_P2P_CLIENT, but the role is not yet known)
         */
        WPA_IF_P2P_GROUP,

        /**
         * WPA_IF_P2P_DEVICE - P2P Device interface is used to indentify the
         * abstracted P2P Device function in the driver
         */
        WPA_IF_P2P_DEVICE
};

struct wpa_init_params {
        void *global_priv;
        const u8 *bssid;
        const char *ifname;
        const u8 *ssid;
        size_t ssid_len;
        const char *test_socket;
        int use_pae_group_addr;
        char **bridge;
        size_t num_bridge;

        u8 *own_addr; /* buffer for writing own MAC address */
};


struct wpa_bss_params {
        /** Interface name (for multi-SSID/VLAN support) */
        const char *ifname;
        /** Whether IEEE 802.1X or WPA/WPA2 is enabled */
        int enabled;

        int wpa;
        int ieee802_1x;
        int wpa_group;
        int wpa_pairwise;
        int wpa_key_mgmt;
        int rsn_preauth;
        enum mfp_options ieee80211w;
};

#define WPA_STA_AUTHORIZED BIT(0)
#define WPA_STA_WMM BIT(1)
#define WPA_STA_SHORT_PREAMBLE BIT(2)
#define WPA_STA_MFP BIT(3)
#define WPA_STA_TDLS_PEER BIT(4)

enum tdls_oper {
        TDLS_DISCOVERY_REQ,
        TDLS_SETUP,
        TDLS_TEARDOWN,
        TDLS_ENABLE_LINK,
        TDLS_DISABLE_LINK,
        TDLS_ENABLE,
        TDLS_DISABLE
};

enum wnm_oper {
        WNM_SLEEP_ENTER_CONFIRM,
        WNM_SLEEP_ENTER_FAIL,
        WNM_SLEEP_EXIT_CONFIRM,
        WNM_SLEEP_EXIT_FAIL,
        WNM_SLEEP_TFS_REQ_IE_ADD,   /* STA requests driver to add TFS req IE */
        WNM_SLEEP_TFS_REQ_IE_NONE,  /* STA requests empty TFS req IE */
        WNM_SLEEP_TFS_REQ_IE_SET,   /* AP requests driver to set TFS req IE for
                                     * a STA */
        WNM_SLEEP_TFS_RESP_IE_ADD,  /* AP requests driver to add TFS resp IE
                                     * for a STA */
        WNM_SLEEP_TFS_RESP_IE_NONE, /* AP requests empty TFS resp IE */
        WNM_SLEEP_TFS_RESP_IE_SET,  /* AP requests driver to set TFS resp IE
                                     * for a STA */
        WNM_SLEEP_TFS_IE_DEL        /* AP delete the TFS IE */
};

/* enum chan_width - Channel width definitions */
enum chan_width {
        CHAN_WIDTH_20_NOHT,
        CHAN_WIDTH_20,
        CHAN_WIDTH_40,
        CHAN_WIDTH_80,
        CHAN_WIDTH_80P80,
        CHAN_WIDTH_160,
        CHAN_WIDTH_UNKNOWN
};

/**
 * struct wpa_signal_info - Information about channel signal quality
 */
struct wpa_signal_info {
        u32 frequency;
        int above_threshold;
        int current_signal;
        int avg_signal;
        int current_noise;
        int current_txrate;
        enum chan_width chanwidth;
        int center_frq1;
        int center_frq2;
};

/**
 * struct beacon_data - Beacon data
 * @head: Head portion of Beacon frame (before TIM IE)
 * @tail: Tail portion of Beacon frame (after TIM IE)
 * @beacon_ies: Extra information element(s) to add into Beacon frames or %NULL
 * @proberesp_ies: Extra information element(s) to add into Probe Response
 *      frames or %NULL
 * @assocresp_ies: Extra information element(s) to add into (Re)Association
 *      Response frames or %NULL
 * @probe_resp: Probe Response frame template
 * @head_len: Length of @head
 * @tail_len: Length of @tail
 * @beacon_ies_len: Length of beacon_ies in octets
 * @proberesp_ies_len: Length of proberesp_ies in octets
 * @proberesp_ies_len: Length of proberesp_ies in octets
 * @probe_resp_len: Length of probe response template (@probe_resp)
 */
struct beacon_data {
        u8 *head, *tail;
        u8 *beacon_ies;
        u8 *proberesp_ies;
        u8 *assocresp_ies;
        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 csa_settings - Settings for channel switch command
 * @cs_count: Count in Beacon frames (TBTT) to perform the switch
 * @block_tx: 1 - block transmission for CSA period
 * @freq_params: Next channel frequency parameter
 * @beacon_csa: Beacon/probe resp/asooc resp info for CSA period
 * @beacon_after: Next beacon/probe resp/asooc resp info
 * @counter_offset_beacon: Offset to the count field in beacon's tail
 * @counter_offset_presp: Offset to the count field in probe resp.
 */
struct csa_settings {
        u8 cs_count;
        u8 block_tx;

        struct hostapd_freq_params freq_params;
        struct beacon_data beacon_csa;
        struct beacon_data beacon_after;

        u16 counter_offset_beacon;
        u16 counter_offset_presp;
};

/* TDLS peer capabilities for send_tdls_mgmt() */
enum tdls_peer_capability {
        TDLS_PEER_HT = BIT(0),
        TDLS_PEER_VHT = BIT(1),
        TDLS_PEER_WMM = BIT(2),
};

/**
 * struct wpa_driver_ops - Driver interface API definition
 *
 * This structure defines the API that each driver interface needs to implement
 * for core wpa_supplicant code. All driver specific functionality is captured
 * in this wrapper.
 */
struct wpa_driver_ops {
        /** Name of the driver interface */
        const char *name;
        /** One line description of the driver interface */
        const char *desc;

        /**
         * get_bssid - Get the current BSSID
         * @priv: private driver interface data
         * @bssid: buffer for BSSID (ETH_ALEN = 6 bytes)
         *
         * Returns: 0 on success, -1 on failure
         *
         * Query kernel driver for the current BSSID and copy it to bssid.
         * Setting bssid to 00:00:00:00:00:00 is recommended if the STA is not
         * associated.
         */
        int (*get_bssid)(void *priv, u8 *bssid);

        /**
         * get_ssid - Get the current SSID
         * @priv: private driver interface data
         * @ssid: buffer for SSID (at least 32 bytes)
         *
         * Returns: Length of the SSID on success, -1 on failure
         *
         * Query kernel driver for the current SSID and copy it to ssid.
         * Returning zero is recommended if the STA is not associated.
         *
         * Note: SSID is an array of octets, i.e., it is not nul terminated and
         * can, at least in theory, contain control characters (including nul)
         * and as such, should be processed as binary data, not a printable
         * string.
         */
        int (*get_ssid)(void *priv, u8 *ssid);

        /**
         * set_key - Configure encryption key
         * @ifname: Interface name (for multi-SSID/VLAN support)
         * @priv: private driver interface data
         * @alg: encryption algorithm (%WPA_ALG_NONE, %WPA_ALG_WEP,
         *      %WPA_ALG_TKIP, %WPA_ALG_CCMP, %WPA_ALG_IGTK, %WPA_ALG_PMK,
         *      %WPA_ALG_GCMP, %WPA_ALG_GCMP_256, %WPA_ALG_CCMP_256,
         *      %WPA_ALG_BIP_GMAC_128, %WPA_ALG_BIP_GMAC_256,
         *      %WPA_ALG_BIP_CMAC_256);
         *      %WPA_ALG_NONE clears the key.
         * @addr: Address of the peer STA (BSSID of the current AP when setting
         *      pairwise key in station mode), ff:ff:ff:ff:ff:ff for
         *      broadcast keys, %NULL for default keys that are used both for
         *      broadcast and unicast; when clearing keys, %NULL is used to
         *      indicate that both the broadcast-only and default key of the
         *      specified key index is to be cleared
         * @key_idx: key index (0..3), usually 0 for unicast keys; 0..4095 for
         *      IGTK
         * @set_tx: configure this key as the default Tx key (only used when
         *      driver does not support separate unicast/individual key
         * @seq: sequence number/packet number, seq_len octets, the next
         *      packet number to be used for in replay protection; configured
         *      for Rx keys (in most cases, this is only used with broadcast
         *      keys and set to zero for unicast keys); %NULL if not set
         * @seq_len: length of the seq, depends on the algorithm:
         *      TKIP: 6 octets, CCMP/GCMP: 6 octets, IGTK: 6 octets
         * @key: key buffer; TKIP: 16-byte temporal key, 8-byte Tx Mic key,
         *      8-byte Rx Mic Key
         * @key_len: length of the key buffer in octets (WEP: 5 or 13,
         *      TKIP: 32, CCMP/GCMP: 16, IGTK: 16)
         *
         * Returns: 0 on success, -1 on failure
         *
         * Configure the given key for the kernel driver. If the driver
         * supports separate individual keys (4 default keys + 1 individual),
         * addr can be used to determine whether the key is default or
         * individual. If only 4 keys are supported, the default key with key
         * index 0 is used as the individual key. STA must be configured to use
         * it as the default Tx key (set_tx is set) and accept Rx for all the
         * key indexes. In most cases, WPA uses only key indexes 1 and 2 for
         * broadcast keys, so key index 0 is available for this kind of
         * configuration.
         *
         * Please note that TKIP keys include separate TX and RX MIC keys and
         * some drivers may expect them in different order than wpa_supplicant
         * is using. If the TX/RX keys are swapped, all TKIP encrypted packets
         * will trigger Michael MIC errors. This can be fixed by changing the
         * order of MIC keys by swapping te bytes 16..23 and 24..31 of the key
         * in driver_*.c set_key() implementation, see driver_ndis.c for an
         * example on how this can be done.
         */
        int (*set_key)(const char *ifname, void *priv, enum wpa_alg alg,
                       const u8 *addr, int key_idx, int set_tx,
                       const u8 *seq, size_t seq_len,
                       const u8 *key, size_t key_len);

        /**
         * init - Initialize driver interface
         * @ctx: context to be used when calling wpa_supplicant functions,
         * e.g., wpa_supplicant_event()
         * @ifname: interface name, e.g., wlan0
         *
         * Returns: Pointer to private data, %NULL on failure
         *
         * Initialize driver interface, including event processing for kernel
         * driver events (e.g., associated, scan results, Michael MIC failure).
         * This function can allocate a private configuration data area for
         * @ctx, file descriptor, interface name, etc. information that may be
         * needed in future driver operations. If this is not used, non-NULL
         * value will need to be returned because %NULL is used to indicate
         * failure. The returned value will be used as 'void *priv' data for
         * all other driver_ops functions.
         *
         * The main event loop (eloop.c) of wpa_supplicant can be used to
         * register callback for read sockets (eloop_register_read_sock()).
         *
         * See below for more information about events and
         * wpa_supplicant_event() function.
         */
        void * (*init)(void *ctx, const char *ifname);

        /**
         * deinit - Deinitialize driver interface
         * @priv: private driver interface data from init()
         *
         * Shut down driver interface and processing of driver events. Free
         * private data buffer if one was allocated in init() handler.
         */
        void (*deinit)(void *priv);

        /**
         * set_param - Set driver configuration parameters
         * @priv: private driver interface data from init()
         * @param: driver specific configuration parameters
         *
         * Returns: 0 on success, -1 on failure
         *
         * Optional handler for notifying driver interface about configuration
         * parameters (driver_param).
         */
        int (*set_param)(void *priv, const char *param);

        /**
         * set_countermeasures - Enable/disable TKIP countermeasures
         * @priv: private driver interface data
         * @enabled: 1 = countermeasures enabled, 0 = disabled
         *
         * Returns: 0 on success, -1 on failure
         *
         * Configure TKIP countermeasures. When these are enabled, the driver
         * should drop all received and queued frames that are using TKIP.
         */
        int (*set_countermeasures)(void *priv, int enabled);

        /**
         * deauthenticate - Request driver to deauthenticate
         * @priv: private driver interface data
         * @addr: peer address (BSSID of the AP)
         * @reason_code: 16-bit reason code to be sent in the deauthentication
         *      frame
         *
         * Returns: 0 on success, -1 on failure
         */
        int (*deauthenticate)(void *priv, const u8 *addr, int reason_code);

        /**
         * associate - Request driver to associate
         * @priv: private driver interface data
         * @params: association parameters
         *
         * Returns: 0 on success, -1 on failure
         */
        int (*associate)(void *priv,
                         struct wpa_driver_associate_params *params);

        /**
         * add_pmkid - Add PMKSA cache entry to the driver
         * @priv: private driver interface data
         * @bssid: BSSID for the PMKSA cache entry
         * @pmkid: PMKID for the PMKSA cache entry
         *
         * Returns: 0 on success, -1 on failure
         *
         * This function is called when a new PMK is received, as a result of
         * either normal authentication or RSN pre-authentication.
         *
         * If the driver generates RSN IE, i.e., it does not use wpa_ie in
         * associate(), add_pmkid() can be used to add new PMKSA cache entries
         * in the driver. If the driver uses wpa_ie from wpa_supplicant, this
         * driver_ops function does not need to be implemented. Likewise, if
         * the driver does not support WPA, this function is not needed.
         */
        int (*add_pmkid)(void *priv, const u8 *bssid, const u8 *pmkid);

        /**
         * remove_pmkid - Remove PMKSA cache entry to the driver
         * @priv: private driver interface data
         * @bssid: BSSID for the PMKSA cache entry
         * @pmkid: PMKID for the PMKSA cache entry
         *
         * Returns: 0 on success, -1 on failure
         *
         * This function is called when the supplicant drops a PMKSA cache
         * entry for any reason.
         *
         * If the driver generates RSN IE, i.e., it does not use wpa_ie in
         * associate(), remove_pmkid() can be used to synchronize PMKSA caches
         * between the driver and wpa_supplicant. If the driver uses wpa_ie
         * from wpa_supplicant, this driver_ops function does not need to be
         * implemented. Likewise, if the driver does not support WPA, this
         * function is not needed.
         */
        int (*remove_pmkid)(void *priv, const u8 *bssid, const u8 *pmkid);

        /**
         * flush_pmkid - Flush PMKSA cache
         * @priv: private driver interface data
         *
         * Returns: 0 on success, -1 on failure
         *
         * This function is called when the supplicant drops all PMKSA cache
         * entries for any reason.
         *
         * If the driver generates RSN IE, i.e., it does not use wpa_ie in
         * associate(), remove_pmkid() can be used to synchronize PMKSA caches
         * between the driver and wpa_supplicant. If the driver uses wpa_ie
         * from wpa_supplicant, this driver_ops function does not need to be
         * implemented. Likewise, if the driver does not support WPA, this
         * function is not needed.
         */
        int (*flush_pmkid)(void *priv);

        /**
         * get_capa - Get driver capabilities
         * @priv: private driver interface data
         *
         * Returns: 0 on success, -1 on failure
         *
         * Get driver/firmware/hardware capabilities.
         */
        int (*get_capa)(void *priv, struct wpa_driver_capa *capa);

        /**
         * poll - Poll driver for association information
         * @priv: private driver interface data
         *
         * This is an option callback that can be used when the driver does not
         * provide event mechanism for association events. This is called when
         * receiving WPA EAPOL-Key messages that require association
         * information. The driver interface is supposed to generate associnfo
         * event before returning from this callback function. In addition, the
         * driver interface should generate an association event after having
         * sent out associnfo.
         */
        void (*poll)(void *priv);

        /**
         * get_ifname - Get interface name
         * @priv: private driver interface data
         *
         * Returns: Pointer to the interface name. This can differ from the
         * interface name used in init() call. Init() is called first.
         *
         * This optional function can be used to allow the driver interface to
         * replace the interface name with something else, e.g., based on an
         * interface mapping from a more descriptive name.
         */
        const char * (*get_ifname)(void *priv);

        /**
         * get_mac_addr - Get own MAC address
         * @priv: private driver interface data
         *
         * Returns: Pointer to own MAC address or %NULL on failure
         *
         * This optional function can be used to get the own MAC address of the
         * device from the driver interface code. This is only needed if the
         * l2_packet implementation for the OS does not provide easy access to
         * a MAC address. */
        const u8 * (*get_mac_addr)(void *priv);

        /**
         * send_eapol - Optional function for sending EAPOL packets
         * @priv: private driver interface data
         * @dest: Destination MAC address
         * @proto: Ethertype
         * @data: EAPOL packet starting with IEEE 802.1X header
         * @data_len: Size of the EAPOL packet
         *
         * Returns: 0 on success, -1 on failure
         *
         * This optional function can be used to override l2_packet operations
         * with driver specific functionality. If this function pointer is set,
         * l2_packet module is not used at all and the driver interface code is
         * responsible for receiving and sending all EAPOL packets. The
         * received EAPOL packets are sent to core code with EVENT_EAPOL_RX
         * event. The driver interface is required to implement get_mac_addr()
         * handler if send_eapol() is used.
         */
        int (*send_eapol)(void *priv, const u8 *dest, u16 proto,
                          const u8 *data, size_t data_len);

        /**
         * set_operstate - Sets device operating state to DORMANT or UP
         * @priv: private driver interface data
         * @state: 0 = dormant, 1 = up
         * Returns: 0 on success, -1 on failure
         *
         * This is an optional function that can be used on operating systems
         * that support a concept of controlling network device state from user
         * space applications. This function, if set, gets called with
         * state = 1 when authentication has been completed and with state = 0
         * when connection is lost.
         */
        int (*set_operstate)(void *priv, int state);

        /**
         * mlme_setprotection - MLME-SETPROTECTION.request primitive
         * @priv: Private driver interface data
         * @addr: Address of the station for which to set protection (may be
         * %NULL for group keys)
         * @protect_type: MLME_SETPROTECTION_PROTECT_TYPE_*
         * @key_type: MLME_SETPROTECTION_KEY_TYPE_*
         * Returns: 0 on success, -1 on failure
         *
         * This is an optional function that can be used to set the driver to
         * require protection for Tx and/or Rx frames. This uses the layer
         * interface defined in IEEE 802.11i-2004 clause 10.3.22.1
         * (MLME-SETPROTECTION.request). Many drivers do not use explicit
         * set protection operation; instead, they set protection implicitly
         * based on configured keys.
         */
        int (*mlme_setprotection)(void *priv, const u8 *addr, int protect_type,
                                  int key_type);

        /**
         * get_hw_feature_data - Get hardware support data (channels and rates)
         * @priv: Private driver interface data
         * @num_modes: Variable for returning the number of returned modes
         * flags: Variable for returning hardware feature flags
         * Returns: Pointer to allocated hardware data on success or %NULL on
         * failure. Caller is responsible for freeing this.
         */
        struct hostapd_hw_modes * (*get_hw_feature_data)(void *priv,
                                                         u16 *num_modes,
                                                         u16 *flags);

        /**
         * send_mlme - Send management frame from MLME
         * @priv: Private driver interface data
         * @data: IEEE 802.11 management frame with IEEE 802.11 header
         * @data_len: Size of the management frame
         * @noack: Do not wait for this frame to be acked (disable retries)
         * Returns: 0 on success, -1 on failure
         */
        int (*send_mlme)(void *priv, const u8 *data, size_t data_len,
                         int noack);

        /**
         * update_ft_ies - Update FT (IEEE 802.11r) IEs
         * @priv: Private driver interface data
         * @md: Mobility domain (2 octets) (also included inside ies)
         * @ies: FT IEs (MDIE, FTIE, ...) or %NULL to remove IEs
         * @ies_len: Length of FT IEs in bytes
         * Returns: 0 on success, -1 on failure
         *
         * The supplicant uses this callback to let the driver know that keying
         * material for FT is available and that the driver can use the
         * provided IEs in the next message in FT authentication sequence.
         *
         * This function is only needed for driver that support IEEE 802.11r
         * (Fast BSS Transition).
         */
        int (*update_ft_ies)(void *priv, const u8 *md, const u8 *ies,
                             size_t ies_len);

        /**
         * send_ft_action - Send FT Action frame (IEEE 802.11r)
         * @priv: Private driver interface data
         * @action: Action field value
         * @target_ap: Target AP address
         * @ies: FT IEs (MDIE, FTIE, ...) (FT Request action frame body)
         * @ies_len: Length of FT IEs in bytes
         * Returns: 0 on success, -1 on failure
         *
         * The supplicant uses this callback to request the driver to transmit
         * an FT Action frame (action category 6) for over-the-DS fast BSS
         * transition.
         */
        int (*send_ft_action)(void *priv, u8 action, const u8 *target_ap,
                              const u8 *ies, size_t ies_len);

        /**
         * get_scan_results2 - Fetch the latest scan results
         * @priv: private driver interface data
         *
         * Returns: Allocated buffer of scan results (caller is responsible for
         * freeing the data structure) on success, NULL on failure
         */
         struct wpa_scan_results * (*get_scan_results2)(void *priv);

        /**
         * set_country - Set country
         * @priv: Private driver interface data
         * @alpha2: country to which to switch to
         * Returns: 0 on success, -1 on failure
         *
         * This function is for drivers which support some form
         * of setting a regulatory domain.
         */
        int (*set_country)(void *priv, const char *alpha2);

        /**
         * get_country - Get country
         * @priv: Private driver interface data
         * @alpha2: Buffer for returning country code (at least 3 octets)
         * Returns: 0 on success, -1 on failure
         */
        int (*get_country)(void *priv, char *alpha2);

        /**
         * global_init - Global driver initialization
         * Returns: Pointer to private data (global), %NULL on failure
         *
         * This optional function is called to initialize the driver wrapper
         * for global data, i.e., data that applies to all interfaces. If this
         * function is implemented, global_deinit() will also need to be
         * implemented to free the private data. The driver will also likely
         * use init2() function instead of init() to get the pointer to global
         * data available to per-interface initializer.
         */
        void * (*global_init)(void);

        /**
         * global_deinit - Global driver deinitialization
         * @priv: private driver global data from global_init()
         *
         * Terminate any global driver related functionality and free the
         * global data structure.
         */
        void (*global_deinit)(void *priv);

        /**
         * init2 - Initialize driver interface (with global data)
         * @ctx: context to be used when calling wpa_supplicant functions,
         * e.g., wpa_supplicant_event()
         * @ifname: interface name, e.g., wlan0
         * @global_priv: private driver global data from global_init()
         * Returns: Pointer to private data, %NULL on failure
         *
         * This function can be used instead of init() if the driver wrapper
         * uses global data.
         */
        void * (*init2)(void *ctx, const char *ifname, void *global_priv);

        /**
         * get_interfaces - Get information about available interfaces
         * @global_priv: private driver global data from global_init()
         * Returns: Allocated buffer of interface information (caller is
         * responsible for freeing the data structure) on success, NULL on
         * failure
         */
        struct wpa_interface_info * (*get_interfaces)(void *global_priv);

        /**
         * scan2 - Request the driver to initiate scan
         * @priv: private driver interface data
         * @params: Scan parameters
         *
         * Returns: 0 on success, -1 on failure
         *
         * Once the scan results are ready, the driver should report scan
         * results event for wpa_supplicant which will eventually request the
         * results with wpa_driver_get_scan_results2().
         */
        int (*scan2)(void *priv, struct wpa_driver_scan_params *params);

        /**
         * authenticate - Request driver to authenticate
         * @priv: private driver interface data
         * @params: authentication parameters
         * Returns: 0 on success, -1 on failure
         *
         * This is an optional function that can be used with drivers that
         * support separate authentication and association steps, i.e., when
         * wpa_supplicant can act as the SME. If not implemented, associate()
         * function is expected to take care of IEEE 802.11 authentication,
         * too.
         */
        int (*authenticate)(void *priv,
                            struct wpa_driver_auth_params *params);

        /**
         * set_ap - Set Beacon and Probe Response information for AP mode
         * @priv: Private driver interface data
         * @params: Parameters to use in AP mode
         *
         * This function is used to configure Beacon template and/or extra IEs
         * to add for Beacon and Probe Response frames for the driver in
         * AP mode. The driver is responsible for building the full Beacon
         * frame by concatenating the head part with TIM IE generated by the
         * driver/firmware and finishing with the tail part. Depending on the
         * driver architectue, this can be done either by using the full
         * template or the set of additional IEs (e.g., WPS and P2P IE).
         * Similarly, Probe Response processing depends on the driver design.
         * If the driver (or firmware) takes care of replying to Probe Request
         * frames, the extra IEs provided here needs to be added to the Probe
         * Response frames.
         *
         * Returns: 0 on success, -1 on failure
         */
        int (*set_ap)(void *priv, struct wpa_driver_ap_params *params);

        /**
         * set_acl - Set ACL in AP mode
         * @priv: Private driver interface data
         * @params: Parameters to configure ACL
         * Returns: 0 on success, -1 on failure
         *
         * This is used only for the drivers which support MAC address ACL.
         */
        int (*set_acl)(void *priv, struct hostapd_acl_params *params);

        /**
         * hapd_init - Initialize driver interface (hostapd only)
         * @hapd: Pointer to hostapd context
         * @params: Configuration for the driver wrapper
         * Returns: Pointer to private data, %NULL on failure
         *
         * This function is used instead of init() or init2() when the driver
         * wrapper is used with hostapd.
         */
        void * (*hapd_init)(struct hostapd_data *hapd,
                            struct wpa_init_params *params);

        /**
         * hapd_deinit - Deinitialize driver interface (hostapd only)
         * @priv: Private driver interface data from hapd_init()
         */
        void (*hapd_deinit)(void *priv);

        /**
         * set_ieee8021x - Enable/disable IEEE 802.1X support (AP only)
         * @priv: Private driver interface data
         * @params: BSS parameters
         * Returns: 0 on success, -1 on failure
         *
         * This is an optional function to configure the kernel driver to
         * enable/disable IEEE 802.1X support and set WPA/WPA2 parameters. This
         * can be left undefined (set to %NULL) if IEEE 802.1X support is
         * always enabled and the driver uses set_ap() to set WPA/RSN IE
         * for Beacon frames.
         *
         * DEPRECATED - use set_ap() instead
         */
        int (*set_ieee8021x)(void *priv, struct wpa_bss_params *params);

        /**
         * set_privacy - Enable/disable privacy (AP only)
         * @priv: Private driver interface data
         * @enabled: 1 = privacy enabled, 0 = disabled
         * Returns: 0 on success, -1 on failure
         *
         * This is an optional function to configure privacy field in the
         * kernel driver for Beacon frames. This can be left undefined (set to
         * %NULL) if the driver uses the Beacon template from set_ap().
         *
         * DEPRECATED - use set_ap() instead
         */
        int (*set_privacy)(void *priv, int enabled);

        /**
         * get_seqnum - Fetch the current TSC/packet number (AP only)
         * @ifname: The interface name (main or virtual)
         * @priv: Private driver interface data
         * @addr: MAC address of the station or %NULL for group keys
         * @idx: Key index
         * @seq: Buffer for returning the latest used TSC/packet number
         * Returns: 0 on success, -1 on failure
         *
         * This function is used to fetch the last used TSC/packet number for
         * a TKIP, CCMP, GCMP, or BIP/IGTK key. It is mainly used with group
         * keys, so there is no strict requirement on implementing support for
         * unicast keys (i.e., addr != %NULL).
         */
        int (*get_seqnum)(const char *ifname, void *priv, const u8 *addr,
                          int idx, u8 *seq);

        /**
         * flush - Flush all association stations (AP only)
         * @priv: Private driver interface data
         * Returns: 0 on success, -1 on failure
         *
         * This function requests the driver to disassociate all associated
         * stations. This function does not need to be implemented if the
         * driver does not process association frames internally.
         */
        int (*flush)(void *priv);

        /**
         * set_generic_elem - Add IEs into Beacon/Probe Response frames (AP)
         * @priv: Private driver interface data
         * @elem: Information elements
         * @elem_len: Length of the elem buffer in octets
         * Returns: 0 on success, -1 on failure
         *
         * This is an optional function to add information elements in the
         * kernel driver for Beacon and Probe Response frames. This can be left
         * undefined (set to %NULL) if the driver uses the Beacon template from
         * set_ap().
         *
         * DEPRECATED - use set_ap() instead
         */
        int (*set_generic_elem)(void *priv, const u8 *elem, size_t elem_len);

        /**
         * read_sta_data - Fetch station data
         * @priv: Private driver interface data
         * @data: Buffer for returning station information
         * @addr: MAC address of the station
         * Returns: 0 on success, -1 on failure
         */
        int (*read_sta_data)(void *priv, struct hostap_sta_driver_data *data,
                             const u8 *addr);

        /**
         * hapd_send_eapol - Send an EAPOL packet (AP only)
         * @priv: private driver interface data
         * @addr: Destination MAC address
         * @data: EAPOL packet starting with IEEE 802.1X header
         * @data_len: Length of the EAPOL packet in octets
         * @encrypt: Whether the frame should be encrypted
         * @own_addr: Source MAC address
         * @flags: WPA_STA_* flags for the destination station
         *
         * Returns: 0 on success, -1 on failure
         */
        int (*hapd_send_eapol)(void *priv, const u8 *addr, const u8 *data,
                               size_t data_len, int encrypt,
                               const u8 *own_addr, u32 flags);

        /**
         * sta_deauth - Deauthenticate a station (AP only)
         * @priv: Private driver interface data
         * @own_addr: Source address and BSSID for the Deauthentication frame
         * @addr: MAC address of the station to deauthenticate
         * @reason: Reason code for the Deauthentiation frame
         * Returns: 0 on success, -1 on failure
         *
         * This function requests a specific station to be deauthenticated and
         * a Deauthentication frame to be sent to it.
         */
        int (*sta_deauth)(void *priv, const u8 *own_addr, const u8 *addr,
                          int reason);

        /**
         * sta_disassoc - Disassociate a station (AP only)
         * @priv: Private driver interface data
         * @own_addr: Source address and BSSID for the Disassociation frame
         * @addr: MAC address of the station to disassociate
         * @reason: Reason code for the Disassociation frame
         * Returns: 0 on success, -1 on failure
         *
         * This function requests a specific station to be disassociated and
         * a Disassociation frame to be sent to it.
         */
        int (*sta_disassoc)(void *priv, const u8 *own_addr, const u8 *addr,
                            int reason);

        /**
         * sta_remove - Remove a station entry (AP only)
         * @priv: Private driver interface data
         * @addr: MAC address of the station to be removed
         * Returns: 0 on success, -1 on failure
         */
        int (*sta_remove)(void *priv, const u8 *addr);

        /**
         * hapd_get_ssid - Get the current SSID (AP only)
         * @priv: Private driver interface data
         * @buf: Buffer for returning the SSID
         * @len: Maximum length of the buffer
         * Returns: Length of the SSID on success, -1 on failure
         *
         * This function need not be implemented if the driver uses Beacon
         * template from set_ap() and does not reply to Probe Request frames.
         */
        int (*hapd_get_ssid)(void *priv, u8 *buf, int len);

        /**
         * hapd_set_ssid - Set SSID (AP only)
         * @priv: Private driver interface data
         * @buf: SSID
         * @len: Length of the SSID in octets
         * Returns: 0 on success, -1 on failure
         *
         * DEPRECATED - use set_ap() instead
         */
        int (*hapd_set_ssid)(void *priv, const u8 *buf, int len);

        /**
         * hapd_set_countermeasures - Enable/disable TKIP countermeasures (AP)
         * @priv: Private driver interface data
         * @enabled: 1 = countermeasures enabled, 0 = disabled
         * Returns: 0 on success, -1 on failure
         *
         * This need not be implemented if the driver does not take care of
         * association processing.
         */
        int (*hapd_set_countermeasures)(void *priv, int enabled);

        /**
         * sta_add - Add a station entry
         * @priv: Private driver interface data
         * @params: Station parameters
         * Returns: 0 on success, -1 on failure
         *
         * This function is used to add a station entry to the driver once the
         * station has completed association. This is only used if the driver
         * does not take care of association processing.
         *
         * With TDLS, this function is also used to add or set (params->set 1)
         * TDLS peer entries.
         */
        int (*sta_add)(void *priv, struct hostapd_sta_add_params *params);

        /**
         * get_inact_sec - Get station inactivity duration (AP only)
         * @priv: Private driver interface data
         * @addr: Station address
         * Returns: Number of seconds station has been inactive, -1 on failure
         */
        int (*get_inact_sec)(void *priv, const u8 *addr);

        /**
         * sta_clear_stats - Clear station statistics (AP only)
         * @priv: Private driver interface data
         * @addr: Station address
         * Returns: 0 on success, -1 on failure
         */
        int (*sta_clear_stats)(void *priv, const u8 *addr);

        /**
         * set_freq - Set channel/frequency (AP only)
         * @priv: Private driver interface data
         * @freq: Channel parameters
         * Returns: 0 on success, -1 on failure
         */
        int (*set_freq)(void *priv, struct hostapd_freq_params *freq);

        /**
         * set_rts - Set RTS threshold
         * @priv: Private driver interface data
         * @rts: RTS threshold in octets
         * Returns: 0 on success, -1 on failure
         */
        int (*set_rts)(void *priv, int rts);

        /**
         * set_frag - Set fragmentation threshold
         * @priv: Private driver interface data
         * @frag: Fragmentation threshold in octets
         * Returns: 0 on success, -1 on failure
         */
        int (*set_frag)(void *priv, int frag);

        /**
         * sta_set_flags - Set station flags (AP only)
         * @priv: Private driver interface data
         * @addr: Station address
         * @total_flags: Bitmap of all WPA_STA_* flags currently set
         * @flags_or: Bitmap of WPA_STA_* flags to add
         * @flags_and: Bitmap of WPA_STA_* flags to us as a mask
         * Returns: 0 on success, -1 on failure
         */
        int (*sta_set_flags)(void *priv, const u8 *addr,
                             int total_flags, int flags_or, int flags_and);

        /**
         * set_tx_queue_params - Set TX queue parameters
         * @priv: Private driver interface data
         * @queue: Queue number (0 = VO, 1 = VI, 2 = BE, 3 = BK)
         * @aifs: AIFS
         * @cw_min: cwMin
         * @cw_max: cwMax
         * @burst_time: Maximum length for bursting in 0.1 msec units
         */
        int (*set_tx_queue_params)(void *priv, int queue, int aifs, int cw_min,
                                   int cw_max, int burst_time);

        /**
         * if_add - Add a virtual interface
         * @priv: Private driver interface data
         * @type: Interface type
         * @ifname: Interface name for the new virtual interface
         * @addr: Local address to use for the interface or %NULL to use the
         *      parent interface address
         * @bss_ctx: BSS context for %WPA_IF_AP_BSS interfaces
         * @drv_priv: Pointer for overwriting the driver context or %NULL if
         *      not allowed (applies only to %WPA_IF_AP_BSS type)
         * @force_ifname: Buffer for returning an interface name that the
         *      driver ended up using if it differs from the requested ifname
         * @if_addr: Buffer for returning the allocated interface address
         *      (this may differ from the requested addr if the driver cannot
         *      change interface address)
         * @bridge: Bridge interface to use or %NULL if no bridge configured
         * @use_existing: Whether to allow existing interface to be used
         * Returns: 0 on success, -1 on failure
         */
        int (*if_add)(void *priv, enum wpa_driver_if_type type,
                      const char *ifname, const u8 *addr, void *bss_ctx,
                      void **drv_priv, char *force_ifname, u8 *if_addr,
                      const char *bridge, int use_existing);

        /**
         * if_remove - Remove a virtual interface
         * @priv: Private driver interface data
         * @type: Interface type
         * @ifname: Interface name of the virtual interface to be removed
         * Returns: 0 on success, -1 on failure
         */
        int (*if_remove)(void *priv, enum wpa_driver_if_type type,
                         const char *ifname);

        /**
         * set_sta_vlan - Bind a station into a specific interface (AP only)
         * @priv: Private driver interface data
         * @ifname: Interface (main or virtual BSS or VLAN)
         * @addr: MAC address of the associated station
         * @vlan_id: VLAN ID
         * Returns: 0 on success, -1 on failure
         *
         * This function is used to bind a station to a specific virtual
         * interface. It is only used if when virtual interfaces are supported,
         * e.g., to assign stations to different VLAN interfaces based on
         * information from a RADIUS server. This allows separate broadcast
         * domains to be used with a single BSS.
         */
        int (*set_sta_vlan)(void *priv, const u8 *addr, const char *ifname,
                            int vlan_id);

        /**
         * commit - Optional commit changes handler (AP only)
         * @priv: driver private data
         * Returns: 0 on success, -1 on failure
         *
         * This optional handler function can be registered if the driver
         * interface implementation needs to commit changes (e.g., by setting
         * network interface up) at the end of initial configuration. If set,
         * this handler will be called after initial setup has been completed.
         */
        int (*commit)(void *priv);

        /**
         * send_ether - Send an ethernet packet (AP only)
         * @priv: private driver interface data
         * @dst: Destination MAC address
         * @src: Source MAC address
         * @proto: Ethertype
         * @data: EAPOL packet starting with IEEE 802.1X header
         * @data_len: Length of the EAPOL packet in octets
         * Returns: 0 on success, -1 on failure
         */
        int (*send_ether)(void *priv, const u8 *dst, const u8 *src, u16 proto,
                          const u8 *data, size_t data_len);

        /**
         * set_radius_acl_auth - Notification of RADIUS ACL change
         * @priv: Private driver interface data
         * @mac: MAC address of the station
         * @accepted: Whether the station was accepted
         * @session_timeout: Session timeout for the station
         * Returns: 0 on success, -1 on failure
         */
        int (*set_radius_acl_auth)(void *priv, const u8 *mac, int accepted, 
                                   u32 session_timeout);

        /**
         * set_radius_acl_expire - Notification of RADIUS ACL expiration
         * @priv: Private driver interface data
         * @mac: MAC address of the station
         * Returns: 0 on success, -1 on failure
         */
        int (*set_radius_acl_expire)(void *priv, const u8 *mac);

        /**
         * set_ap_wps_ie - Add WPS IE(s) into Beacon/Probe Response frames (AP)
         * @priv: Private driver interface data
         * @beacon: WPS IE(s) for Beacon frames or %NULL to remove extra IE(s)
         * @proberesp: WPS IE(s) for Probe Response frames or %NULL to remove
         *      extra IE(s)
         * @assocresp: WPS IE(s) for (Re)Association Response frames or %NULL
         *      to remove extra IE(s)
         * Returns: 0 on success, -1 on failure
         *
         * This is an optional function to add WPS IE in the kernel driver for
         * Beacon and Probe Response frames. This can be left undefined (set
         * to %NULL) if the driver uses the Beacon template from set_ap()
         * and does not process Probe Request frames. If the driver takes care
         * of (Re)Association frame processing, the assocresp buffer includes
         * WPS IE(s) that need to be added to (Re)Association Response frames
         * whenever a (Re)Association Request frame indicated use of WPS.
         *
         * This will also be used to add P2P IE(s) into Beacon/Probe Response
         * frames when operating as a GO. The driver is responsible for adding
         * timing related attributes (e.g., NoA) in addition to the IEs
         * included here by appending them after these buffers. This call is
         * also used to provide Probe Response IEs for P2P Listen state
         * operations for drivers that generate the Probe Response frames
         * internally.
         *
         * DEPRECATED - use set_ap() instead
         */
        int (*set_ap_wps_ie)(void *priv, const struct wpabuf *beacon,
                             const struct wpabuf *proberesp,
                             const struct wpabuf *assocresp);

        /**
         * set_supp_port - Set IEEE 802.1X Supplicant Port status
         * @priv: Private driver interface data
         * @authorized: Whether the port is authorized
         * Returns: 0 on success, -1 on failure
         */
        int (*set_supp_port)(void *priv, int authorized);

        /**
         * set_wds_sta - Bind a station into a 4-address WDS (AP only)
         * @priv: Private driver interface data
         * @addr: MAC address of the associated station
         * @aid: Association ID
         * @val: 1 = bind to 4-address WDS; 0 = unbind
         * @bridge_ifname: Bridge interface to use for the WDS station or %NULL
         *      to indicate that bridge is not to be used
         * @ifname_wds: Buffer to return the interface name for the new WDS
         *      station or %NULL to indicate name is not returned.
         * Returns: 0 on success, -1 on failure
         */
        int (*set_wds_sta)(void *priv, const u8 *addr, int aid, int val,
                           const char *bridge_ifname, char *ifname_wds);

        /**
         * send_action - Transmit an Action frame
         * @priv: Private driver interface data
         * @freq: Frequency (in MHz) of the channel
         * @wait: Time to wait off-channel for a response (in ms), or zero
         * @dst: Destination MAC address (Address 1)
         * @src: Source MAC address (Address 2)
         * @bssid: BSSID (Address 3)
         * @data: Frame body
         * @data_len: data length in octets
         @ @no_cck: Whether CCK rates must not be used to transmit this frame
         * Returns: 0 on success, -1 on failure
         *
         * This command can be used to request the driver to transmit an action
         * frame to the specified destination.
         *
         * If the %WPA_DRIVER_FLAGS_OFFCHANNEL_TX flag is set, the frame will
         * be transmitted on the given channel and the device will wait for a
         * response on that channel for the given wait time.
         *
         * If the flag is not set, the wait time will be ignored. In this case,
         * if a remain-on-channel duration is in progress, the frame must be
         * transmitted on that channel; alternatively the frame may be sent on
         * the current operational channel (if in associated state in station
         * mode or while operating as an AP.)
         */
        int (*send_action)(void *priv, unsigned int freq, unsigned int wait,
                           const u8 *dst, const u8 *src, const u8 *bssid,
                           const u8 *data, size_t data_len, int no_cck);

        /**
         * send_action_cancel_wait - Cancel action frame TX wait
         * @priv: Private driver interface data
         *
         * This command cancels the wait time associated with sending an action
         * frame. It is only available when %WPA_DRIVER_FLAGS_OFFCHANNEL_TX is
         * set in the driver flags.
         */
        void (*send_action_cancel_wait)(void *priv);

        /**
         * remain_on_channel - Remain awake on a channel
         * @priv: Private driver interface data
         * @freq: Frequency (in MHz) of the channel
         * @duration: Duration in milliseconds
         * Returns: 0 on success, -1 on failure
         *
         * This command is used to request the driver to remain awake on the
         * specified channel for the specified duration and report received
         * Action frames with EVENT_RX_MGMT events. Optionally, received
         * Probe Request frames may also be requested to be reported by calling
         * probe_req_report(). These will be reported with EVENT_RX_PROBE_REQ.
         *
         * The driver may not be at the requested channel when this function
         * returns, i.e., the return code is only indicating whether the
         * request was accepted. The caller will need to wait until the
         * EVENT_REMAIN_ON_CHANNEL event indicates that the driver has
         * completed the channel change. This may take some time due to other
         * need for the radio and the caller should be prepared to timing out
         * its wait since there are no guarantees on when this request can be
         * executed.
         */
        int (*remain_on_channel)(void *priv, unsigned int freq,
                                 unsigned int duration);

        /**
         * cancel_remain_on_channel - Cancel remain-on-channel operation
         * @priv: Private driver interface data
         *
         * This command can be used to cancel a remain-on-channel operation
         * before its originally requested duration has passed. This could be
         * used, e.g., when remain_on_channel() is used to request extra time
         * to receive a response to an Action frame and the response is
         * received when there is still unneeded time remaining on the
         * remain-on-channel operation.
         */
        int (*cancel_remain_on_channel)(void *priv);

        /**
         * probe_req_report - Request Probe Request frames to be indicated
         * @priv: Private driver interface data
         * @report: Whether to report received Probe Request frames
         * Returns: 0 on success, -1 on failure (or if not supported)
         *
         * This command can be used to request the driver to indicate when
         * Probe Request frames are received with EVENT_RX_PROBE_REQ events.
         * Since this operation may require extra resources, e.g., due to less
         * optimal hardware/firmware RX filtering, many drivers may disable
         * Probe Request reporting at least in station mode. This command is
         * used to notify the driver when the Probe Request frames need to be
         * reported, e.g., during remain-on-channel operations.
         */
        int (*probe_req_report)(void *priv, int report);

        /**
         * deinit_ap - Deinitialize AP mode
         * @priv: Private driver interface data
         * Returns: 0 on success, -1 on failure (or if not supported)
         *
         * This optional function can be used to disable AP mode related
         * configuration. If the interface was not dynamically added,
         * change the driver mode to station mode to allow normal station
         * operations like scanning to be completed.
         */
        int (*deinit_ap)(void *priv);

        /**
         * deinit_p2p_cli - Deinitialize P2P client mode
         * @priv: Private driver interface data
         * Returns: 0 on success, -1 on failure (or if not supported)
         *
         * This optional function can be used to disable P2P client mode. If the
         * interface was not dynamically added, change the interface type back
         * to station mode.
         */
        int (*deinit_p2p_cli)(void *priv);

        /**
         * suspend - Notification on system suspend/hibernate event
         * @priv: Private driver interface data
         */
        void (*suspend)(void *priv);

        /**
         * resume - Notification on system resume/thaw event
         * @priv: Private driver interface data
         */
        void (*resume)(void *priv);

        /**
         * signal_monitor - Set signal monitoring parameters
         * @priv: Private driver interface data
         * @threshold: Threshold value for signal change events; 0 = disabled
         * @hysteresis: Minimum change in signal strength before indicating a
         *      new event
         * Returns: 0 on success, -1 on failure (or if not supported)
         *
         * This function can be used to configure monitoring of signal strength
         * with the current AP. Whenever signal strength drops below the
         * %threshold value or increases above it, EVENT_SIGNAL_CHANGE event
         * should be generated assuming the signal strength has changed at
         * least %hysteresis from the previously indicated signal change event.
         */
        int (*signal_monitor)(void *priv, int threshold, int hysteresis);

        /**
         * send_frame - Send IEEE 802.11 frame (testing use only)
         * @priv: Private driver interface data
         * @data: IEEE 802.11 frame with IEEE 802.11 header
         * @data_len: Size of the frame
         * @encrypt: Whether to encrypt the frame (if keys are set)
         * Returns: 0 on success, -1 on failure
         *
         * This function is only used for debugging purposes and is not
         * required to be implemented for normal operations.
         */
        int (*send_frame)(void *priv, const u8 *data, size_t data_len,
                          int encrypt);

        /**
         * shared_freq - Get operating frequency of shared interface(s)
         * @priv: Private driver interface data
         * Returns: Operating frequency in MHz, 0 if no shared operation in
         * use, or -1 on failure
         *
         * This command can be used to request the current operating frequency
         * of any virtual interface that shares the same radio to provide
         * information for channel selection for other virtual interfaces.
         */
        int (*shared_freq)(void *priv);

        /**
         * get_noa - Get current Notice of Absence attribute payload
         * @priv: Private driver interface data
         * @buf: Buffer for returning NoA
         * @buf_len: Buffer length in octets
         * Returns: Number of octets used in buf, 0 to indicate no NoA is being
         * advertized, or -1 on failure
         *
         * This function is used to fetch the current Notice of Absence
         * attribute value from GO.
         */
        int (*get_noa)(void *priv, u8 *buf, size_t buf_len);

        /**
         * set_noa - Set Notice of Absence parameters for GO (testing)
         * @priv: Private driver interface data
         * @count: Count
         * @start: Start time in ms from next TBTT
         * @duration: Duration in ms
         * Returns: 0 on success or -1 on failure
         *
         * This function is used to set Notice of Absence parameters for GO. It
         * is used only for testing. To disable NoA, all parameters are set to
         * 0.
         */
        int (*set_noa)(void *priv, u8 count, int start, int duration);

        /**
         * set_p2p_powersave - Set P2P power save options
         * @priv: Private driver interface data
         * @legacy_ps: 0 = disable, 1 = enable, 2 = maximum PS, -1 = no change
         * @opp_ps: 0 = disable, 1 = enable, -1 = no change
         * @ctwindow: 0.. = change (msec), -1 = no change
         * Returns: 0 on success or -1 on failure
         */
        int (*set_p2p_powersave)(void *priv, int legacy_ps, int opp_ps,
                                 int ctwindow);

        /**
         * ampdu - Enable/disable aggregation
         * @priv: Private driver interface data
         * @ampdu: 1/0 = enable/disable A-MPDU aggregation
         * Returns: 0 on success or -1 on failure
         */
        int (*ampdu)(void *priv, int ampdu);

        /**
         * get_radio_name - Get physical radio name for the device
         * @priv: Private driver interface data
         * Returns: Radio name or %NULL if not known
         *
         * The returned data must not be modified by the caller. It is assumed
         * that any interface that has the same radio name as another is
         * sharing the same physical radio. This information can be used to
         * share scan results etc. information between the virtual interfaces
         * to speed up various operations.
         */
        const char * (*get_radio_name)(void *priv);

        /**
         * send_tdls_mgmt - for sending TDLS management packets
         * @priv: private driver interface data
         * @dst: Destination (peer) MAC address
         * @action_code: TDLS action code for the mssage
         * @dialog_token: Dialog Token to use in the message (if needed)
         * @status_code: Status Code or Reason Code to use (if needed)
         * @peer_capab: TDLS peer capability (TDLS_PEER_* bitfield)
         * @buf: TDLS IEs to add to the message
         * @len: Length of buf in octets
         * Returns: 0 on success, negative (<0) on failure
         *
         * This optional function can be used to send packet to driver which is
         * responsible for receiving and sending all TDLS packets.
         */
        int (*send_tdls_mgmt)(void *priv, const u8 *dst, u8 action_code,
                              u8 dialog_token, u16 status_code, u32 peer_capab,
                              const u8 *buf, size_t len);

        /**
         * tdls_oper - Ask the driver to perform high-level TDLS operations
         * @priv: Private driver interface data
         * @oper: TDLS high-level operation. See %enum tdls_oper
         * @peer: Destination (peer) MAC address
         * Returns: 0 on success, negative (<0) on failure
         *
         * This optional function can be used to send high-level TDLS commands
         * to the driver.
         */
        int (*tdls_oper)(void *priv, enum tdls_oper oper, const u8 *peer);

        /**
         * wnm_oper - Notify driver of the WNM frame reception
         * @priv: Private driver interface data
         * @oper: WNM operation. See %enum wnm_oper
         * @peer: Destination (peer) MAC address
         * @buf: Buffer for the driver to fill in (for getting IE)
         * @buf_len: Return the len of buf
         * Returns: 0 on success, negative (<0) on failure
         */
        int (*wnm_oper)(void *priv, enum wnm_oper oper, const u8 *peer,
                        u8 *buf, u16 *buf_len);

        /**
         * set_qos_map - Set QoS Map
         * @priv: Private driver interface data
         * @qos_map_set: QoS Map
         * @qos_map_set_len: Length of QoS Map
         */
        int (*set_qos_map)(void *priv, const u8 *qos_map_set,
                           u8 qos_map_set_len);

        /**
         * signal_poll - Get current connection information
         * @priv: Private driver interface data
         * @signal_info: Connection info structure
         */
        int (*signal_poll)(void *priv, struct wpa_signal_info *signal_info);

        /**
         * set_authmode - Set authentication algorithm(s) for static WEP
         * @priv: Private driver interface data
         * @authmode: 1=Open System, 2=Shared Key, 3=both
         * Returns: 0 on success, -1 on failure
         *
         * This function can be used to set authentication algorithms for AP
         * mode when static WEP is used. If the driver uses user space MLME/SME
         * implementation, there is no need to implement this function.
         *
         * DEPRECATED - use set_ap() instead
         */
        int (*set_authmode)(void *priv, int authmode);

#ifdef ANDROID
        /**
         * driver_cmd - Execute driver-specific command
         * @priv: Private driver interface data
         * @cmd: Command to execute
         * @buf: Return buffer
         * @buf_len: Buffer length
         * Returns: 0 on success, -1 on failure
         */
        int (*driver_cmd)(void *priv, char *cmd, char *buf, size_t buf_len);
#endif /* ANDROID */

        /**
         * vendor_cmd - Execute vendor specific command
         * @priv: Private driver interface data
         * @vendor_id: Vendor id
         * @subcmd: Vendor command id
         * @data: Vendor command parameters (%NULL if no parameters)
         * @data_len: Data length
         * @buf: Return buffer (%NULL to ignore reply)
         * Returns: 0 on success, negative (<0) on failure
         *
         * This function handles vendor specific commands that are passed to
         * the driver/device. The command is identified by vendor id and
         * command id. Parameters can be passed as argument to the command
         * in the data buffer. Reply (if any) will be filled in the supplied
         * return buffer.
         *
         * The exact driver behavior is driver interface and vendor specific. As
         * an example, this will be converted to a vendor specific cfg80211
         * command in case of the nl80211 driver interface.
         */
        int (*vendor_cmd)(void *priv, unsigned int vendor_id,
                          unsigned int subcmd, const u8 *data, size_t data_len,
                          struct wpabuf *buf);

        /**
         * set_rekey_info - Set rekey information
         * @priv: Private driver interface data
         * @kek: Current KEK
         * @kck: Current KCK
         * @replay_ctr: Current EAPOL-Key Replay Counter
         *
         * This optional function can be used to provide information for the
         * driver/firmware to process EAPOL-Key frames in Group Key Handshake
         * while the host (including wpa_supplicant) is sleeping.
         */
        void (*set_rekey_info)(void *priv, const u8 *kek, const u8 *kck,
                               const u8 *replay_ctr);

        /**
         * sta_assoc - Station association indication
         * @priv: Private driver interface data
         * @own_addr: Source address and BSSID for association frame
         * @addr: MAC address of the station to associate
         * @reassoc: flag to indicate re-association
         * @status: association response status code
         * @ie: assoc response ie buffer
         * @len: ie buffer length
         * Returns: 0 on success, -1 on failure
         *
         * This function indicates the driver to send (Re)Association
         * Response frame to the station.
         */
         int (*sta_assoc)(void *priv, const u8 *own_addr, const u8 *addr,
                          int reassoc, u16 status, const u8 *ie, size_t len);

        /**
         * sta_auth - Station authentication indication
         * @priv: Private driver interface data
         * @own_addr: Source address and BSSID for authentication frame
         * @addr: MAC address of the station to associate
         * @seq: authentication sequence number
         * @status: authentication response status code
         * @ie: authentication frame ie buffer
         * @len: ie buffer length
         *
         * This function indicates the driver to send Authentication frame
         * to the station.
         */
         int (*sta_auth)(void *priv, const u8 *own_addr, const u8 *addr,
                         u16 seq, u16 status, const u8 *ie, size_t len);

        /**
         * add_tspec - Add traffic stream
         * @priv: Private driver interface data
         * @addr: MAC address of the station to associate
         * @tspec_ie: tspec ie buffer
         * @tspec_ielen: tspec ie length
         * Returns: 0 on success, -1 on failure
         *
         * This function adds the traffic steam for the station
         * and fills the medium_time in tspec_ie.
         */
         int (*add_tspec)(void *priv, const u8 *addr, u8 *tspec_ie,
                          size_t tspec_ielen);

        /**
         * add_sta_node - Add a station node in the driver
         * @priv: Private driver interface data
         * @addr: MAC address of the station to add
         * @auth_alg: authentication algorithm used by the station
         * Returns: 0 on success, -1 on failure
         *
         * This function adds the station node in the driver, when
         * the station gets added by FT-over-DS.
         */
        int (*add_sta_node)(void *priv, const u8 *addr, u16 auth_alg);

        /**
         * sched_scan - Request the driver to initiate scheduled scan
         * @priv: Private driver interface data
         * @params: Scan parameters
         * @interval: Interval between scan cycles in milliseconds
         * Returns: 0 on success, -1 on failure
         *
         * This operation should be used for scheduled scan offload to
         * the hardware. Every time scan results are available, the
         * driver should report scan results event for wpa_supplicant
         * which will eventually request the results with
         * wpa_driver_get_scan_results2(). This operation is optional
         * and if not provided or if it returns -1, we fall back to
         * normal host-scheduled scans.
         */
        int (*sched_scan)(void *priv, struct wpa_driver_scan_params *params,
                          u32 interval);

        /**
         * stop_sched_scan - Request the driver to stop a scheduled scan
         * @priv: Private driver interface data
         * Returns: 0 on success, -1 on failure
         *
         * This should cause the scheduled scan to be stopped and
         * results should stop being sent. Must be supported if
         * sched_scan is supported.
         */
        int (*stop_sched_scan)(void *priv);

        /**
         * poll_client - Probe (null data or such) the given station
         * @priv: Private driver interface data
         * @own_addr: MAC address of sending interface
         * @addr: MAC address of the station to probe
         * @qos: Indicates whether station is QoS station
         *
         * This function is used to verify whether an associated station is
         * still present. This function does not need to be implemented if the
         * driver provides such inactivity polling mechanism.
         */
        void (*poll_client)(void *priv, const u8 *own_addr,
                            const u8 *addr, int qos);

        /**
         * radio_disable - Disable/enable radio
         * @priv: Private driver interface data
         * @disabled: 1=disable 0=enable radio
         * Returns: 0 on success, -1 on failure
         *
         * This optional command is for testing purposes. It can be used to
         * disable the radio on a testbed device to simulate out-of-radio-range
         * conditions.
         */
        int (*radio_disable)(void *priv, int disabled);

        /**
         * switch_channel - Announce channel switch and migrate the GO to the
         * given frequency
         * @priv: Private driver interface data
         * @settings: Settings for CSA period and new channel
         * Returns: 0 on success, -1 on failure
         *
         * This function is used to move the GO to the legacy STA channel to
         * avoid frequency conflict in single channel concurrency.
         */
        int (*switch_channel)(void *priv, struct csa_settings *settings);

        /**
         * start_dfs_cac - Listen for radar interference on the channel
         * @priv: Private driver interface data
         * @freq: Channel parameters
         * Returns: 0 on success, -1 on failure
         */
        int (*start_dfs_cac)(void *priv, struct hostapd_freq_params *freq);

        /**
         * stop_ap - Removes beacon from AP
         * @priv: Private driver interface data
         * Returns: 0 on success, -1 on failure (or if not supported)
         *
         * This optional function can be used to disable AP mode related
         * configuration. Unlike deinit_ap, it does not change to station
         * mode.
         */
        int (*stop_ap)(void *priv);

        /**
         * get_survey - Retrieve survey data
         * @priv: Private driver interface data
         * @freq: If set, survey data for the specified frequency is only
         *      being requested. If not set, all survey data is requested.
         * Returns: 0 on success, -1 on failure
         *
         * Use this to retrieve:
         *
         * - the observed channel noise floor
         * - the amount of time we have spent on the channel
         * - the amount of time during which we have spent on the channel that
         *   the radio has determined the medium is busy and we cannot
         *   transmit
         * - the amount of time we have spent receiving data
         * - the amount of time we have spent transmitting data
         *
         * This data can be used for spectrum heuristics. One example is
         * Automatic Channel Selection (ACS). The channel survey data is
         * kept on a linked list on the channel data, one entry is added
         * for each survey. The min_nf of the channel is updated for each
         * survey.
         */
        int (*get_survey)(void *priv, unsigned int freq);

        /**
         * status - Get driver interface status information
         * @priv: Private driver interface data
         * @buf: Buffer for printing tou the status information
         * @buflen: Maximum length of the buffer
         * Returns: Length of written status information or -1 on failure
         */
        int (*status)(void *priv, char *buf, size_t buflen);
};


/**
 * enum wpa_event_type - Event type for wpa_supplicant_event() calls
 */
enum wpa_event_type {
        /**
         * EVENT_ASSOC - Association completed
         *
         * This event needs to be delivered when the driver completes IEEE
         * 802.11 association or reassociation successfully.
         * wpa_driver_ops::get_bssid() is expected to provide the current BSSID
         * after this event has been generated. In addition, optional
         * EVENT_ASSOCINFO may be generated just before EVENT_ASSOC to provide
         * more information about the association. If the driver interface gets
         * both of these events at the same time, it can also include the
         * assoc_info data in EVENT_ASSOC call.
         */
        EVENT_ASSOC,

        /**
         * EVENT_DISASSOC - Association lost
         *
         * This event should be called when association is lost either due to
         * receiving deauthenticate or disassociate frame from the AP or when
         * sending either of these frames to the current AP. If the driver
         * supports separate deauthentication event, EVENT_DISASSOC should only
         * be used for disassociation and EVENT_DEAUTH for deauthentication.
         * In AP mode, union wpa_event_data::disassoc_info is required.
         */
        EVENT_DISASSOC,

        /**
         * EVENT_MICHAEL_MIC_FAILURE - Michael MIC (TKIP) detected
         *
         * This event must be delivered when a Michael MIC error is detected by
         * the local driver. Additional data for event processing is
         * provided with union wpa_event_data::michael_mic_failure. This
         * information is used to request new encyption key and to initiate
         * TKIP countermeasures if needed.
         */
        EVENT_MICHAEL_MIC_FAILURE,

        /**
         * EVENT_SCAN_RESULTS - Scan results available
         *
         * This event must be called whenever scan results are available to be
         * fetched with struct wpa_driver_ops::get_scan_results(). This event
         * is expected to be used some time after struct wpa_driver_ops::scan()
         * is called. If the driver provides an unsolicited event when the scan
         * has been completed, this event can be used to trigger
         * EVENT_SCAN_RESULTS call. If such event is not available from the
         * driver, the driver wrapper code is expected to use a registered
         * timeout to generate EVENT_SCAN_RESULTS call after the time that the
         * scan is expected to be completed. Optional information about
         * completed scan can be provided with union wpa_event_data::scan_info.
         */
        EVENT_SCAN_RESULTS,

        /**
         * EVENT_ASSOCINFO - Report optional extra information for association
         *
         * This event can be used to report extra association information for
         * EVENT_ASSOC processing. This extra information includes IEs from
         * association frames and Beacon/Probe Response frames in union
         * wpa_event_data::assoc_info. EVENT_ASSOCINFO must be send just before
         * EVENT_ASSOC. Alternatively, the driver interface can include
         * assoc_info data in the EVENT_ASSOC call if it has all the
         * information available at the same point.
         */
        EVENT_ASSOCINFO,

        /**
         * EVENT_INTERFACE_STATUS - Report interface status changes
         *
         * This optional event can be used to report changes in interface
         * status (interface added/removed) using union
         * wpa_event_data::interface_status. This can be used to trigger
         * wpa_supplicant to stop and re-start processing for the interface,
         * e.g., when a cardbus card is ejected/inserted.
         */
        EVENT_INTERFACE_STATUS,

        /**
         * EVENT_PMKID_CANDIDATE - Report a candidate AP for pre-authentication
         *
         * This event can be used to inform wpa_supplicant about candidates for
         * RSN (WPA2) pre-authentication. If wpa_supplicant is not responsible
         * for scan request (ap_scan=2 mode), this event is required for
         * pre-authentication. If wpa_supplicant is performing scan request
         * (ap_scan=1), this event is optional since scan results can be used
         * to add pre-authentication candidates. union
         * wpa_event_data::pmkid_candidate is used to report the BSSID of the
         * candidate and priority of the candidate, e.g., based on the signal
         * strength, in order to try to pre-authenticate first with candidates
         * that are most likely targets for re-association.
         *
         * EVENT_PMKID_CANDIDATE can be called whenever the driver has updates
         * on the candidate list. In addition, it can be called for the current
         * AP and APs that have existing PMKSA cache entries. wpa_supplicant
         * will automatically skip pre-authentication in cases where a valid
         * PMKSA exists. When more than one candidate exists, this event should
         * be generated once for each candidate.
         *
         * Driver will be notified about successful pre-authentication with
         * struct wpa_driver_ops::add_pmkid() calls.
         */
        EVENT_PMKID_CANDIDATE,

        /**
         * EVENT_STKSTART - Request STK handshake (MLME-STKSTART.request)
         *
         * This event can be used to inform wpa_supplicant about desire to set
         * up secure direct link connection between two stations as defined in
         * IEEE 802.11e with a new PeerKey mechanism that replaced the original
         * STAKey negotiation. The caller will need to set peer address for the
         * event.
         */
        EVENT_STKSTART,

        /**
         * EVENT_TDLS - Request TDLS operation
         *
         * This event can be used to request a TDLS operation to be performed.
         */
        EVENT_TDLS,

        /**
         * EVENT_FT_RESPONSE - Report FT (IEEE 802.11r) response IEs
         *
         * The driver is expected to report the received FT IEs from
         * FT authentication sequence from the AP. The FT IEs are included in
         * the extra information in union wpa_event_data::ft_ies.
         */
        EVENT_FT_RESPONSE,

        /**
         * EVENT_IBSS_RSN_START - Request RSN authentication in IBSS
         *
         * The driver can use this event to inform wpa_supplicant about a STA
         * in an IBSS with which protected frames could be exchanged. This
         * event starts RSN authentication with the other STA to authenticate
         * the STA and set up encryption keys with it.
         */
        EVENT_IBSS_RSN_START,

        /**
         * EVENT_AUTH - Authentication result
         *
         * This event should be called when authentication attempt has been
         * completed. This is only used if the driver supports separate
         * authentication step (struct wpa_driver_ops::authenticate).
         * Information about authentication result is included in
         * union wpa_event_data::auth.
         */
        EVENT_AUTH,

        /**
         * EVENT_DEAUTH - Authentication lost
         *
         * This event should be called when authentication is lost either due
         * to receiving deauthenticate frame from the AP or when sending that
         * frame to the current AP.
         * In AP mode, union wpa_event_data::deauth_info is required.
         */
        EVENT_DEAUTH,

        /**
         * EVENT_ASSOC_REJECT - Association rejected
         *
         * This event should be called when (re)association attempt has been
         * rejected by the AP. Information about the association response is
         * included in union wpa_event_data::assoc_reject.
         */
        EVENT_ASSOC_REJECT,

        /**
         * EVENT_AUTH_TIMED_OUT - Authentication timed out
         */
        EVENT_AUTH_TIMED_OUT,

        /**
         * EVENT_ASSOC_TIMED_OUT - Association timed out
         */
        EVENT_ASSOC_TIMED_OUT,

        /**
         * EVENT_FT_RRB_RX - FT (IEEE 802.11r) RRB frame received
         */
        EVENT_FT_RRB_RX,

        /**
         * EVENT_WPS_BUTTON_PUSHED - Report hardware push button press for WPS
         */
        EVENT_WPS_BUTTON_PUSHED,

        /**
         * EVENT_TX_STATUS - Report TX status
         */
        EVENT_TX_STATUS,

        /**
         * EVENT_RX_FROM_UNKNOWN - Report RX from unknown STA
         */
        EVENT_RX_FROM_UNKNOWN,

        /**
         * EVENT_RX_MGMT - Report RX of a management frame
         */
        EVENT_RX_MGMT,

        /**
         * EVENT_REMAIN_ON_CHANNEL - Remain-on-channel duration started
         *
         * This event is used to indicate when the driver has started the
         * requested remain-on-channel duration. Information about the
         * operation is included in union wpa_event_data::remain_on_channel.
         */
        EVENT_REMAIN_ON_CHANNEL,

        /**
         * EVENT_CANCEL_REMAIN_ON_CHANNEL - Remain-on-channel timed out
         *
         * This event is used to indicate when the driver has completed
         * remain-on-channel duration, i.e., may noot be available on the
         * requested channel anymore. Information about the
         * operation is included in union wpa_event_data::remain_on_channel.
         */
        EVENT_CANCEL_REMAIN_ON_CHANNEL,

        /**
         * EVENT_MLME_RX - Report reception of frame for MLME (test use only)
         *
         * This event is used only by driver_test.c and userspace MLME.
         */
        EVENT_MLME_RX,

        /**
         * EVENT_RX_PROBE_REQ - Indicate received Probe Request frame
         *
         * This event is used to indicate when a Probe Request frame has been
         * received. Information about the received frame is included in
         * union wpa_event_data::rx_probe_req. The driver is required to report
         * these events only after successfully completed probe_req_report()
         * commands to request the events (i.e., report parameter is non-zero)
         * in station mode. In AP mode, Probe Request frames should always be
         * reported.
         */
        EVENT_RX_PROBE_REQ,

        /**
         * EVENT_NEW_STA - New wired device noticed
         *
         * This event is used to indicate that a new device has been detected
         * in a network that does not use association-like functionality (i.e.,
         * mainly wired Ethernet). This can be used to start EAPOL
         * authenticator when receiving a frame from a device. The address of
         * the device is included in union wpa_event_data::new_sta.
         */
        EVENT_NEW_STA,

        /**
         * EVENT_EAPOL_RX - Report received EAPOL frame
         *
         * When in AP mode with hostapd, this event is required to be used to
         * deliver the receive EAPOL frames from the driver. With
         * %wpa_supplicant, this event is used only if the send_eapol() handler
         * is used to override the use of l2_packet for EAPOL frame TX.
         */
        EVENT_EAPOL_RX,

        /**
         * EVENT_SIGNAL_CHANGE - Indicate change in signal strength
         *
         * This event is used to indicate changes in the signal strength
         * observed in frames received from the current AP if signal strength
         * monitoring has been enabled with signal_monitor().
         */
        EVENT_SIGNAL_CHANGE,

        /**
         * EVENT_INTERFACE_ENABLED - Notify that interface was enabled
         *
         * This event is used to indicate that the interface was enabled after
         * having been previously disabled, e.g., due to rfkill.
         */
        EVENT_INTERFACE_ENABLED,

        /**
         * EVENT_INTERFACE_DISABLED - Notify that interface was disabled
         *
         * This event is used to indicate that the interface was disabled,
         * e.g., due to rfkill.
         */
        EVENT_INTERFACE_DISABLED,

        /**
         * EVENT_CHANNEL_LIST_CHANGED - Channel list changed
         *
         * This event is used to indicate that the channel list has changed,
         * e.g., because of a regulatory domain change triggered by scan
         * results including an AP advertising a country code.
         */
        EVENT_CHANNEL_LIST_CHANGED,

        /**
         * EVENT_INTERFACE_UNAVAILABLE - Notify that interface is unavailable
         *
         * This event is used to indicate that the driver cannot maintain this
         * interface in its operation mode anymore. The most likely use for
         * this is to indicate that AP mode operation is not available due to
         * operating channel would need to be changed to a DFS channel when
         * the driver does not support radar detection and another virtual
         * interfaces caused the operating channel to change. Other similar
         * resource conflicts could also trigger this for station mode
         * interfaces.
         */
        EVENT_INTERFACE_UNAVAILABLE,

        /**
         * EVENT_BEST_CHANNEL
         *
         * Driver generates this event whenever it detects a better channel
         * (e.g., based on RSSI or channel use). This information can be used
         * to improve channel selection for a new AP/P2P group.
         */
        EVENT_BEST_CHANNEL,

        /**
         * EVENT_UNPROT_DEAUTH - Unprotected Deauthentication frame received
         *
         * This event should be called when a Deauthentication frame is dropped
         * due to it not being protected (MFP/IEEE 802.11w).
         * union wpa_event_data::unprot_deauth is required to provide more
         * details of the frame.
         */
        EVENT_UNPROT_DEAUTH,

        /**
         * EVENT_UNPROT_DISASSOC - Unprotected Disassociation frame received
         *
         * This event should be called when a Disassociation frame is dropped
         * due to it not being protected (MFP/IEEE 802.11w).
         * union wpa_event_data::unprot_disassoc is required to provide more
         * details of the frame.
         */
        EVENT_UNPROT_DISASSOC,

        /**
         * EVENT_STATION_LOW_ACK
         *
         * Driver generates this event whenever it detected that a particular
         * station was lost. Detection can be through massive transmission
         * failures for example.
         */
        EVENT_STATION_LOW_ACK,

        /**
         * EVENT_IBSS_PEER_LOST - IBSS peer not reachable anymore
         */
        EVENT_IBSS_PEER_LOST,

        /**
         * EVENT_DRIVER_GTK_REKEY - Device/driver did GTK rekey
         *
         * This event carries the new replay counter to notify wpa_supplicant
         * of the current EAPOL-Key Replay Counter in case the driver/firmware
         * completed Group Key Handshake while the host (including
         * wpa_supplicant was sleeping).
         */
        EVENT_DRIVER_GTK_REKEY,

        /**
         * EVENT_SCHED_SCAN_STOPPED - Scheduled scan was stopped
         */
        EVENT_SCHED_SCAN_STOPPED,

        /**
         * EVENT_DRIVER_CLIENT_POLL_OK - Station responded to poll
         *
         * This event indicates that the station responded to the poll
         * initiated with @poll_client.
         */
        EVENT_DRIVER_CLIENT_POLL_OK,

        /**
         * EVENT_EAPOL_TX_STATUS - notify of EAPOL TX status
         */
        EVENT_EAPOL_TX_STATUS,

        /**
         * EVENT_CH_SWITCH - AP or GO decided to switch channels
         *
         * Described in wpa_event_data.ch_switch
         * */
        EVENT_CH_SWITCH,

        /**
         * EVENT_WNM - Request WNM operation
         *
         * This event can be used to request a WNM operation to be performed.
         */
        EVENT_WNM,

        /**
         * EVENT_CONNECT_FAILED_REASON - Connection failure reason in AP mode
         *
         * This event indicates that the driver reported a connection failure
         * with the specified client (for example, max client reached, etc.) in
         * AP mode.
         */
        EVENT_CONNECT_FAILED_REASON,

        /**
         * EVENT_RADAR_DETECTED - Notify of radar detection
         *
         * A radar has been detected on the supplied frequency, hostapd should
         * react accordingly (e.g., change channel).
         */
        EVENT_DFS_RADAR_DETECTED,

        /**
         * EVENT_CAC_FINISHED - Notify that channel availability check has been completed
         *
         * After a successful CAC, the channel can be marked clear and used.
         */
        EVENT_DFS_CAC_FINISHED,

        /**
         * EVENT_CAC_ABORTED - Notify that channel availability check has been aborted
         *
         * The CAC was not successful, and the channel remains in the previous
         * state. This may happen due to a radar beeing detected or other
         * external influences.
         */
        EVENT_DFS_CAC_ABORTED,

        /**
         * EVENT_DFS_CAC_NOP_FINISHED - Notify that non-occupancy period is over
         *
         * The channel which was previously unavailable is now available again.
         */
        EVENT_DFS_NOP_FINISHED,

        /**
         * EVENT_SURVEY - Received survey data
         *
         * This event gets triggered when a driver query is issued for survey
         * data and the requested data becomes available. The returned data is
         * stored in struct survey_results. The results provide at most one
         * survey entry for each frequency and at minimum will provide one
         * survey entry for one frequency. The survey data can be os_malloc()'d
         * and then os_free()'d, so the event callback must only copy data.
         */
        EVENT_SURVEY,

        /**
         * EVENT_SCAN_STARTED - Scan started
         *
         * This indicates that driver has started a scan operation either based
         * on a request from wpa_supplicant/hostapd or from another application.
         * EVENT_SCAN_RESULTS is used to indicate when the scan has been
         * completed (either successfully or by getting cancelled).
         */
        EVENT_SCAN_STARTED,

        /**
         * EVENT_AVOID_FREQUENCIES - Received avoid frequency range
         *
         * This event indicates a set of frequency ranges that should be avoided
         * to reduce issues due to interference or internal co-existence
         * information in the driver.
         */
        EVENT_AVOID_FREQUENCIES
};


/**
 * struct freq_survey - Channel survey info
 *
 * @ifidx: Interface index in which this survey was observed
 * @freq: Center of frequency of the surveyed channel
 * @nf: Channel noise floor in dBm
 * @channel_time: Amount of time in ms the radio spent on the channel
 * @channel_time_busy: Amount of time in ms the radio detected some signal
 *     that indicated to the radio the channel was not clear
 * @channel_time_rx: Amount of time the radio spent receiving data
 * @channel_time_tx: Amount of time the radio spent transmitting data
 * @filled: bitmask indicating which fields have been reported, see
 *     SURVEY_HAS_* defines.
 * @list: Internal list pointers
 */
struct freq_survey {
        u32 ifidx;
        unsigned int freq;
        s8 nf;
        u64 channel_time;
        u64 channel_time_busy;
        u64 channel_time_rx;
        u64 channel_time_tx;
        unsigned int filled;
        struct dl_list list;
};

#define SURVEY_HAS_NF BIT(0)
#define SURVEY_HAS_CHAN_TIME BIT(1)
#define SURVEY_HAS_CHAN_TIME_BUSY BIT(2)
#define SURVEY_HAS_CHAN_TIME_RX BIT(3)
#define SURVEY_HAS_CHAN_TIME_TX BIT(4)


/**
 * union wpa_event_data - Additional data for wpa_supplicant_event() calls
 */
union wpa_event_data {
        /**
         * struct assoc_info - Data for EVENT_ASSOC and EVENT_ASSOCINFO events
         *
         * This structure is optional for EVENT_ASSOC calls and required for
         * EVENT_ASSOCINFO calls. By using EVENT_ASSOC with this data, the
         * driver interface does not need to generate separate EVENT_ASSOCINFO
         * calls.
         */
        struct assoc_info {
                /**
                 * reassoc - Flag to indicate association or reassociation
                 */
                int reassoc;

                /**
                 * req_ies - (Re)Association Request IEs
                 *
                 * If the driver generates WPA/RSN IE, this event data must be
                 * returned for WPA handshake to have needed information. If
                 * wpa_supplicant-generated WPA/RSN IE is used, this
                 * information event is optional.
                 *
                 * This should start with the first IE (fixed fields before IEs
                 * are not included).
                 */
                const u8 *req_ies;

                /**
                 * req_ies_len - Length of req_ies in bytes
                 */
                size_t req_ies_len;

                /**
                 * resp_ies - (Re)Association Response IEs
                 *
                 * Optional association data from the driver. This data is not
                 * required WPA, but may be useful for some protocols and as
                 * such, should be reported if this is available to the driver
                 * interface.
                 *
                 * This should start with the first IE (fixed fields before IEs
                 * are not included).
                 */
                const u8 *resp_ies;

                /**
                 * resp_ies_len - Length of resp_ies in bytes
                 */
                size_t resp_ies_len;

                /**
                 * beacon_ies - Beacon or Probe Response IEs
                 *
                 * Optional Beacon/ProbeResp data: IEs included in Beacon or
                 * Probe Response frames from the current AP (i.e., the one
                 * that the client just associated with). This information is
                 * used to update WPA/RSN IE for the AP. If this field is not
                 * set, the results from previous scan will be used. If no
                 * data for the new AP is found, scan results will be requested
                 * again (without scan request). At this point, the driver is
                 * expected to provide WPA/RSN IE for the AP (if WPA/WPA2 is
                 * used).
                 *
                 * This should start with the first IE (fixed fields before IEs
                 * are not included).
                 */
                const u8 *beacon_ies;

                /**
                 * beacon_ies_len - Length of beacon_ies */
                size_t beacon_ies_len;

                /**
                 * freq - Frequency of the operational channel in MHz
                 */
                unsigned int freq;

                /**
                 * addr - Station address (for AP mode)
                 */
                const u8 *addr;
        } assoc_info;

        /**
         * struct disassoc_info - Data for EVENT_DISASSOC events
         */
        struct disassoc_info {
                /**
                 * addr - Station address (for AP mode)
                 */
                const u8 *addr;

                /**
                 * reason_code - Reason Code (host byte order) used in
                 *      Deauthentication frame
                 */
                u16 reason_code;

                /**
                 * ie - Optional IE(s) in Disassociation frame
                 */
                const u8 *ie;

                /**
                 * ie_len - Length of ie buffer in octets
                 */
                size_t ie_len;

                /**
                 * locally_generated - Whether the frame was locally generated
                 */
                int locally_generated;
        } disassoc_info;

        /**
         * struct deauth_info - Data for EVENT_DEAUTH events
         */
        struct deauth_info {
                /**
                 * addr - Station address (for AP mode)
                 */
                const u8 *addr;

                /**
                 * reason_code - Reason Code (host byte order) used in
                 *      Deauthentication frame
                 */
                u16 reason_code;

                /**
                 * ie - Optional IE(s) in Deauthentication frame
                 */
                const u8 *ie;

                /**
                 * ie_len - Length of ie buffer in octets
                 */
                size_t ie_len;

                /**
                 * locally_generated - Whether the frame was locally generated
                 */
                int locally_generated;
        } deauth_info;

        /**
         * struct michael_mic_failure - Data for EVENT_MICHAEL_MIC_FAILURE
         */
        struct michael_mic_failure {
                int unicast;
                const u8 *src;
        } michael_mic_failure;

        /**
         * struct interface_status - Data for EVENT_INTERFACE_STATUS
         */
        struct interface_status {
                char ifname[100];
                enum {
                        EVENT_INTERFACE_ADDED, EVENT_INTERFACE_REMOVED
                } ievent;
        } interface_status;

        /**
         * struct pmkid_candidate - Data for EVENT_PMKID_CANDIDATE
         */
        struct pmkid_candidate {
                /** BSSID of the PMKID candidate */
                u8 bssid[ETH_ALEN];
                /** Smaller the index, higher the priority */
                int index;
                /** Whether RSN IE includes pre-authenticate flag */
                int preauth;
        } pmkid_candidate;

        /**
         * struct stkstart - Data for EVENT_STKSTART
         */
        struct stkstart {
                u8 peer[ETH_ALEN];
        } stkstart;

        /**
         * struct tdls - Data for EVENT_TDLS
         */
        struct tdls {
                u8 peer[ETH_ALEN];
                enum {
                        TDLS_REQUEST_SETUP,
                        TDLS_REQUEST_TEARDOWN
                } oper;
                u16 reason_code; /* for teardown */
        } tdls;

        /**
         * struct wnm - Data for EVENT_WNM
         */
        struct wnm {
                u8 addr[ETH_ALEN];
                enum {
                        WNM_OPER_SLEEP,
                } oper;
                enum {
                        WNM_SLEEP_ENTER,
                        WNM_SLEEP_EXIT
                } sleep_action;
                int sleep_intval;
                u16 reason_code;
                u8 *buf;
                u16 buf_len;
        } wnm;

        /**
         * struct ft_ies - FT information elements (EVENT_FT_RESPONSE)
         *
         * During FT (IEEE 802.11r) authentication sequence, the driver is
         * expected to use this event to report received FT IEs (MDIE, FTIE,
         * RSN IE, TIE, possible resource request) to the supplicant. The FT
         * IEs for the next message will be delivered through the
         * struct wpa_driver_ops::update_ft_ies() callback.
         */
        struct ft_ies {
                const u8 *ies;
                size_t ies_len;
                int ft_action;
                u8 target_ap[ETH_ALEN];
                /** Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request */
                const u8 *ric_ies;
                /** Length of ric_ies buffer in octets */
                size_t ric_ies_len;
        } ft_ies;

        /**
         * struct ibss_rsn_start - Data for EVENT_IBSS_RSN_START
         */
        struct ibss_rsn_start {
                u8 peer[ETH_ALEN];
        } ibss_rsn_start;

        /**
         * struct auth_info - Data for EVENT_AUTH events
         */
        struct auth_info {
                u8 peer[ETH_ALEN];
                u8 bssid[ETH_ALEN];
                u16 auth_type;
                u16 auth_transaction;
                u16 status_code;
                const u8 *ies;
                size_t ies_len;
        } auth;

        /**
         * struct assoc_reject - Data for EVENT_ASSOC_REJECT events
         */
        struct assoc_reject {
                /**
                 * bssid - BSSID of the AP that rejected association
                 */
                const u8 *bssid;

                /**
                 * resp_ies - (Re)Association Response IEs
                 *
                 * Optional association data from the driver. This data is not
                 * required WPA, but may be useful for some protocols and as
                 * such, should be reported if this is available to the driver
                 * interface.
                 *
                 * This should start with the first IE (fixed fields before IEs
                 * are not included).
                 */
                const u8 *resp_ies;

                /**
                 * resp_ies_len - Length of resp_ies in bytes
                 */
                size_t resp_ies_len;

                /**
                 * status_code - Status Code from (Re)association Response
                 */
                u16 status_code;
        } assoc_reject;

        struct timeout_event {
                u8 addr[ETH_ALEN];
        } timeout_event;

        /**
         * struct ft_rrb_rx - Data for EVENT_FT_RRB_RX events
         */
        struct ft_rrb_rx {
                const u8 *src;
                const u8 *data;
                size_t data_len;
        } ft_rrb_rx;

        /**
         * struct tx_status - Data for EVENT_TX_STATUS events
         */
        struct tx_status {
                u16 type;
                u16 stype;
                const u8 *dst;
                const u8 *data;
                size_t data_len;
                int ack;
        } tx_status;

        /**
         * struct rx_from_unknown - Data for EVENT_RX_FROM_UNKNOWN events
         */
        struct rx_from_unknown {
                const u8 *bssid;
                const u8 *addr;
                int wds;
        } rx_from_unknown;

        /**
         * struct rx_mgmt - Data for EVENT_RX_MGMT events
         */
        struct rx_mgmt {
                const u8 *frame;
                size_t frame_len;
                u32 datarate;

                /**
                 * drv_priv - Pointer to store driver private BSS information
                 *
                 * If not set to NULL, this is used for comparison with
                 * hostapd_data->drv_priv to determine which BSS should process
                 * the frame.
                 */
                void *drv_priv;

                /**
                 * freq - Frequency (in MHz) on which the frame was received
                 */
                int freq;

                /**
                 * ssi_signal - Signal strength in dBm (or 0 if not available)
                 */
                int ssi_signal;
        } rx_mgmt;

        /**
         * struct remain_on_channel - Data for EVENT_REMAIN_ON_CHANNEL events
         *
         * This is also used with EVENT_CANCEL_REMAIN_ON_CHANNEL events.
         */
        struct remain_on_channel {
                /**
                 * freq - Channel frequency in MHz
                 */
                unsigned int freq;

                /**
                 * duration - Duration to remain on the channel in milliseconds
                 */
                unsigned int duration;
        } remain_on_channel;

        /**
         * struct scan_info - Optional data for EVENT_SCAN_RESULTS events
         * @aborted: Whether the scan was aborted
         * @freqs: Scanned frequencies in MHz (%NULL = all channels scanned)
         * @num_freqs: Number of entries in freqs array
         * @ssids: Scanned SSIDs (%NULL or zero-length SSID indicates wildcard
         *      SSID)
         * @num_ssids: Number of entries in ssids array
         */
        struct scan_info {
                int aborted;
                const int *freqs;
                size_t num_freqs;
                struct wpa_driver_scan_ssid ssids[WPAS_MAX_SCAN_SSIDS];
                size_t num_ssids;
        } scan_info;

        /**
         * struct mlme_rx - Data for EVENT_MLME_RX events
         */
        struct mlme_rx {
                const u8 *buf;
                size_t len;
                int freq;
                int channel;
                int ssi;
        } mlme_rx;

        /**
         * struct rx_probe_req - Data for EVENT_RX_PROBE_REQ events
         */
        struct rx_probe_req {
                /**
                 * sa - Source address of the received Probe Request frame
                 */
                const u8 *sa;

                /**
                 * da - Destination address of the received Probe Request frame
                 *      or %NULL if not available
                 */
                const u8 *da;

                /**
                 * bssid - BSSID of the received Probe Request frame or %NULL
                 *      if not available
                 */
                const u8 *bssid;

                /**
                 * ie - IEs from the Probe Request body
                 */
                const u8 *ie;

                /**
                 * ie_len - Length of ie buffer in octets
                 */
                size_t ie_len;

                /**
                 * signal - signal strength in dBm (or 0 if not available)
                 */
                int ssi_signal;
        } rx_probe_req;

        /**
         * struct new_sta - Data for EVENT_NEW_STA events
         */
        struct new_sta {
                const u8 *addr;
        } new_sta;

        /**
         * struct eapol_rx - Data for EVENT_EAPOL_RX events
         */
        struct eapol_rx {
                const u8 *src;
                const u8 *data;
                size_t data_len;
        } eapol_rx;

        /**
         * signal_change - Data for EVENT_SIGNAL_CHANGE events
         */
        struct wpa_signal_info signal_change;

        /**
         * struct best_channel - Data for EVENT_BEST_CHANNEL events
         * @freq_24: Best 2.4 GHz band channel frequency in MHz
         * @freq_5: Best 5 GHz band channel frequency in MHz
         * @freq_overall: Best channel frequency in MHz
         *
         * 0 can be used to indicate no preference in either band.
         */
        struct best_channel {
                int freq_24;
                int freq_5;
                int freq_overall;
        } best_chan;

        struct unprot_deauth {
                const u8 *sa;
                const u8 *da;
                u16 reason_code;
        } unprot_deauth;

        struct unprot_disassoc {
                const u8 *sa;
                const u8 *da;
                u16 reason_code;
        } unprot_disassoc;

        /**
         * struct low_ack - Data for EVENT_STATION_LOW_ACK events
         * @addr: station address
         */
        struct low_ack {
                u8 addr[ETH_ALEN];
        } low_ack;

        /**
         * struct ibss_peer_lost - Data for EVENT_IBSS_PEER_LOST
         */
        struct ibss_peer_lost {
                u8 peer[ETH_ALEN];
        } ibss_peer_lost;

        /**
         * struct driver_gtk_rekey - Data for EVENT_DRIVER_GTK_REKEY
         */
        struct driver_gtk_rekey {
                const u8 *bssid;
                const u8 *replay_ctr;
        } driver_gtk_rekey;

        /**
         * struct client_poll - Data for EVENT_DRIVER_CLIENT_POLL_OK events
         * @addr: station address
         */
        struct client_poll {
                u8 addr[ETH_ALEN];
        } client_poll;

        /**
         * struct eapol_tx_status
         * @dst: Original destination
         * @data: Data starting with IEEE 802.1X header (!)
         * @data_len: Length of data
         * @ack: Indicates ack or lost frame
         *
         * This corresponds to hapd_send_eapol if the frame sent
         * there isn't just reported as EVENT_TX_STATUS.
         */
        struct eapol_tx_status {
                const u8 *dst;
                const u8 *data;
                int data_len;
                int ack;
        } eapol_tx_status;

        /**
         * struct ch_switch
         * @freq: Frequency of new channel in MHz
         * @ht_enabled: Whether this is an HT channel
         * @ch_offset: Secondary channel offset
         * @ch_width: Channel width
         * @cf1: Center frequency 1
         * @cf2: Center frequency 2
         */
        struct ch_switch {
                int freq;
                int ht_enabled;
                int ch_offset;
                enum chan_width ch_width;
                int cf1;
                int cf2;
        } ch_switch;

        /**
         * struct connect_failed - Data for EVENT_CONNECT_FAILED_REASON
         * @addr: Remote client address
         * @code: Reason code for connection failure
         */
        struct connect_failed_reason {
                u8 addr[ETH_ALEN];
                enum {
                        MAX_CLIENT_REACHED,
                        BLOCKED_CLIENT
                } code;
        } connect_failed_reason;

        /**
         * struct dfs_event - Data for radar detected events
         * @freq: Frequency of the channel in MHz
         */
        struct dfs_event {
                int freq;
                int ht_enabled;
                int chan_offset;
                enum chan_width chan_width;
                int cf1;
                int cf2;
        } dfs_event;

        /**
         * survey_results - Survey result data for EVENT_SURVEY
         * @freq_filter: Requested frequency survey filter, 0 if request
         *      was for all survey data
         * @survey_list: Linked list of survey data
         */
        struct survey_results {
                unsigned int freq_filter;
                struct dl_list survey_list; /* struct freq_survey */
        } survey_results;

        /**
         * channel_list_changed - Data for EVENT_CHANNEL_LIST_CHANGED
         * @initiator: Initiator of the regulatory change
         */
        struct channel_list_changed {
                enum reg_change_initiator initiator;
        } channel_list_changed;

        /**
         * freq_range - List of frequency ranges
         *
         * This is used as the data with EVENT_AVOID_FREQUENCIES.
         */
        struct wpa_freq_range_list freq_range;
};

/**
 * wpa_supplicant_event - Report a driver event for wpa_supplicant
 * @ctx: Context pointer (wpa_s); this is the ctx variable registered
 *      with struct wpa_driver_ops::init()
 * @event: event type (defined above)
 * @data: possible extra data for the event
 *
 * Driver wrapper code should call this function whenever an event is received
 * from the driver.
 */
void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
                          union wpa_event_data *data);


/*
 * The following inline functions are provided for convenience to simplify
 * event indication for some of the common events.
 */

static inline void drv_event_assoc(void *ctx, const u8 *addr, const u8 *ie,
                                   size_t ielen, int reassoc)
{
        union wpa_event_data event;
        os_memset(&event, 0, sizeof(event));
        event.assoc_info.reassoc = reassoc;
        event.assoc_info.req_ies = ie;
        event.assoc_info.req_ies_len = ielen;
        event.assoc_info.addr = addr;
        wpa_supplicant_event(ctx, EVENT_ASSOC, &event);
}

static inline void drv_event_disassoc(void *ctx, const u8 *addr)
{
        union wpa_event_data event;
        os_memset(&event, 0, sizeof(event));
        event.disassoc_info.addr = addr;
        wpa_supplicant_event(ctx, EVENT_DISASSOC, &event);
}

static inline void drv_event_eapol_rx(void *ctx, const u8 *src, const u8 *data,
                                      size_t data_len)
{
        union wpa_event_data event;
        os_memset(&event, 0, sizeof(event));
        event.eapol_rx.src = src;
        event.eapol_rx.data = data;
        event.eapol_rx.data_len = data_len;
        wpa_supplicant_event(ctx, EVENT_EAPOL_RX, &event);
}

/* driver_common.c */
void wpa_scan_results_free(struct wpa_scan_results *res);

/* Convert wpa_event_type to a string for logging */
const char * event_to_string(enum wpa_event_type event);

/* NULL terminated array of linked in driver wrappers */
extern struct wpa_driver_ops *wpa_drivers[];

#endif /* DRIVER_H */