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

/*
 * WPA Supplicant - driver interface definition
 * Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#ifndef DRIVER_H
#define DRIVER_H

#define WPA_SUPPLICANT_DRIVER_VERSION 4

#include "common/defs.h"

#define HOSTAPD_CHAN_DISABLED 0x00000001
#define HOSTAPD_CHAN_PASSIVE_SCAN 0x00000002
#define HOSTAPD_CHAN_NO_IBSS 0x00000004
#define HOSTAPD_CHAN_RADAR 0x00000008

struct hostapd_channel_data {
        short chan; /* channel number (IEEE 802.11) */
        short freq; /* frequency in MHz */
        int flag; /* flag for hostapd use (HOSTAPD_CHAN_*) */
        u8 max_tx_power; /* maximum transmit power in dBm */
};

struct hostapd_hw_modes {
        enum hostapd_hw_mode mode;
        int num_channels;
        struct hostapd_channel_data *channels;
        int num_rates;
        int *rates; /* array of rates in 100 kbps units */
        u16 ht_capab;
        u8 mcs_set[16];
        u8 a_mpdu_params;
};


#define AUTH_ALG_OPEN_SYSTEM    0x01
#define AUTH_ALG_SHARED_KEY     0x02
#define AUTH_ALG_LEAP           0x04
#define AUTH_ALG_FT             0x08

#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

#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
 *
 * 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;
        /* followed by ie_len octets of IEs */
};

/**
 * 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
 */
struct wpa_scan_results {
        struct wpa_scan_res **res;
        size_t num;
};

/**
 * 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 4

/**
 * 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;
};

/**
 * 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;
};

/**
 * 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;

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

        /**
         * 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;

        /* The selected pairwise/group cipher and key management
         * suites. These are usually ignored if @wpa_ie is used. */
        enum wpa_cipher pairwise_suite;
        enum wpa_cipher group_suite;
        enum wpa_key_mgmt key_mgmt_suite;

        /**
         * auth_alg - Allowed authentication algorithms
         * Bit field of 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 {
                NO_MGMT_FRAME_PROTECTION,
                MGMT_FRAME_PROTECTION_OPTIONAL,
                MGMT_FRAME_PROTECTION_REQUIRED
        } 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;
};

/**
 * 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
        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
        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
#define WPA_DRIVER_FLAGS_USER_SPACE_MLME 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
        unsigned int flags;

        int max_scan_ssids;
};


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;
};

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

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,
};

struct wpa_init_params {
        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;
};

#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)

/**
 * 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_NONE clears the key.
         * @addr: address of the peer STA or ff:ff:ff:ff:ff:ff for
         *      broadcast/default keys
         * @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)
         * @seq_len: length of the seq, depends on the algorithm:
         *      TKIP: 6 octets, CCMP: 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: 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 tricker 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);

        /**
         * disassociate - Request driver to disassociate
         * @priv: private driver interface data
         * @addr: peer address (BSSID of the AP)
         * @reason_code: 16-bit reason code to be sent in the disassociation
         *      frame
         *
         * Returns: 0 on success, -1 on failure
         */
        int (*disassociate)(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 by calling
         * wpa_supplicant_rx_eapol(). 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.
         *
         * This function is only needed for drivers that export MLME
         * (management frame processing) to wpa_supplicant.
         */
        struct hostapd_hw_modes * (*get_hw_feature_data)(void *priv,
                                                         u16 *num_modes,
                                                         u16 *flags);

        /**
         * set_channel - Set channel
         * @priv: Private driver interface data
         * @phymode: HOSTAPD_MODE_IEEE80211B, ..
         * @chan: IEEE 802.11 channel number
         * @freq: Frequency of the channel in MHz
         * Returns: 0 on success, -1 on failure
         *
         * This function is only needed for drivers that export MLME
         * (management frame processing) to wpa_supplicant.
         */
        int (*set_channel)(void *priv, enum hostapd_hw_mode phymode, int chan,
                           int freq);

        /**
         * set_ssid - Set SSID
         * @priv: Private driver interface data
         * @ssid: SSID
         * @ssid_len: SSID length
         * Returns: 0 on success, -1 on failure
         *
         * This function is only needed for drivers that export MLME
         * (management frame processing) to wpa_supplicant.
         */
        int (*set_ssid)(void *priv, const u8 *ssid, size_t ssid_len);

        /**
         * set_bssid - Set BSSID
         * @priv: Private driver interface data
         * @bssid: BSSID
         * Returns: 0 on success, -1 on failure
         *
         * This function is only needed for drivers that export MLME
         * (management frame processing) to wpa_supplicant.
         */
        int (*set_bssid)(void *priv, const u8 *bssid);

        /**
         * 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
         * Returns: 0 on success, -1 on failure
         *
         * This function is only needed for drivers that export MLME
         * (management frame processing) to wpa_supplicant.
         */
        int (*send_mlme)(void *priv, const u8 *data, size_t data_len);

        /**
         * mlme_add_sta - Add a STA entry into the driver/netstack
         * @priv: Private driver interface data
         * @addr: MAC address of the STA (e.g., BSSID of the AP)
         * @supp_rates: Supported rate set (from (Re)AssocResp); in IEEE 802.11
         * format (one octet per rate, 1 = 0.5 Mbps)
         * @supp_rates_len: Number of entries in supp_rates
         * Returns: 0 on success, -1 on failure
         *
         * This function is only needed for drivers that export MLME
         * (management frame processing) to wpa_supplicant. When the MLME code
         * completes association with an AP, this function is called to
         * configure the driver/netstack with a STA entry for data frame
         * processing (TX rate control, encryption/decryption).
         */
        int (*mlme_add_sta)(void *priv, const u8 *addr, const u8 *supp_rates,
                            size_t supp_rates_len);

        /**
         * mlme_remove_sta - Remove a STA entry from the driver/netstack
         * @priv: Private driver interface data
         * @addr: MAC address of the STA (e.g., BSSID of the AP)
         * Returns: 0 on success, -1 on failure
         *
         * This function is only needed for drivers that export MLME
         * (management frame processing) to wpa_supplicant.
         */
        int (*mlme_remove_sta)(void *priv, const u8 *addr);

        /**
         * 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);

        /**
         * 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_beacon - Set Beacon frame template
         * @iface: Interface name (main interface or virtual BSS)
         * @priv: Private driver interface data
         * @head: Beacon head from IEEE 802.11 header to IEs before TIM IE
         * @head_len: Length of the head buffer in octets
         * @tail: Beacon tail following TIM IE
         * @tail_len: Length of the tail buffer in octets
         * @dtim_period: DTIM period
         * @beacon_int: Beacon interval
         * Returns: 0 on success, -1 on failure
         *
         * This function is used to configure Beacon template 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.
         */
        int (*set_beacon)(const char *ifname, void *priv,
                          const u8 *head, size_t head_len,
                          const u8 *tail, size_t tail_len, int dtim_period,
                          int beacon_int);

        /**
         * 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 withh 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_beacon() to set WPA/RSN IE
         * for Beacon frames.
         */
        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_beacon().
         */
        int (*set_privacy)(const char *ifname, 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, 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)
         * @ifname: The interface name (main or virtual BSS)
         * @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_beacon().
         */
        int (*set_generic_elem)(const char *ifname, void *priv, const u8 *elem,
                                size_t elem_len);

        /**
         * read_sta_data - Fetch station data (AP only)
         * @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
         *
         * 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);

        /**
         * 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)
         * @ifname: Interface (master or virtual BSS)
         * @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_beacon() and does not reply to Probe Request
         * frames.
         */
        int (*hapd_get_ssid)(const char *ifname, void *priv, u8 *buf, int len);

        /**
         * hapd_set_ssid - Set SSID (AP only)
         * @ifname: Interface (master or virtual BSS)
         * @priv: Private driver interface data
         * @buf: SSID
         * @len: Length of the SSID in octets
         * Returns: 0 on success, -1 on failure
         */
        int (*hapd_set_ssid)(const char *ifname, 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
         * @ifname: Interface (master or virtual)
         * @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.
         */
        int (*sta_add)(const char *ifname, 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_rate_sets - Set supported and basic rate sets (AP only)
         * @priv: Private driver interface data
         * @supp_rates: -1 terminated array of supported rates in 100 kbps
         * @basic_rates: -1 terminated array of basic rates in 100 kbps
         * @mode: hardware mode (HOSTAPD_MODE_*)
         * Returns: 0 on success, -1 on failure
         */
        int (*set_rate_sets)(void *priv, int *supp_rates, int *basic_rates,
                             int mode);

        /**
         * set_cts_protect - Set CTS protection mode (AP only)
         * @priv: Private driver interface data
         * @value: Whether CTS protection is enabled
         * Returns: 0 on success, -1 on failure
         */
        int (*set_cts_protect)(void *priv, int value);

        /**
         * set_preamble - Set preamble mode (AP only)
         * @priv: Private driver interface data
         * @value: Whether short preamble is enabled
         * Returns: 0 on success, -1 on failure
         */
        int (*set_preamble)(void *priv, int value);

        /**
         * set_short_slot_time - Set short slot time (AP only)
         * @priv: Private driver interface data
         * @value: Whether short slot time is enabled
         * Returns: 0 on success, -1 on failure
         */
        int (*set_short_slot_time)(void *priv, int value);

        /**
         * set_tx_queue_params - Set TX queue parameters
         * @priv: Private driver interface data
         * @queue: Queue number
         * @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);

        /**
         * valid_bss_mask - Validate BSSID mask
         * @priv: Private driver interface data
         * @addr: Address
         * @mask: Mask
         * Returns: 0 if mask is valid, -1 if mask is not valid, 1 if mask can
         * be used, but the main interface address must be the first address in
         * the block if mask is applied
         */
        int (*valid_bss_mask)(void *priv, const u8 *addr, const u8 *mask);

        /**
         * if_add - Add a virtual interface
         * @iface: Parent interface name
         * @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
         * Returns: 0 on success, -1 on failure
         */
        int (*if_add)(const char *iface, void *priv,
                      enum wpa_driver_if_type type, const char *ifname,
                      const u8 *addr, void *bss_ctx);

        /**
         * 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_ht_params - Set HT parameters (AP only)
         * @ifname: The interface name (main or virtual BSS)
         * @priv: Private driver interface data
         * @ht_capab: HT Capabilities IE
         * @ht_capab_len: Length of ht_capab in octets
         * @ht_oper: HT Operation IE
         * @ht_oper_len: Length of ht_oper in octets
         * Returns: 0 on success, -1 on failure
         */
        int (*set_ht_params)(const char *ifname, void *priv,
                             const u8 *ht_capab, size_t ht_capab_len,
                             const u8 *ht_oper, size_t ht_oper_len);

        /**
         * set_ap_wps_ie - Add WPS IE into Beacon/Probe Response frames (AP)
         * @ifname: The interface name (main or virtual BSS)
         * @priv: Private driver interface data
         * @beacon: WPS IE for Beacon frames
         * @proberesp: WPS IE for Probe Response frames
         * 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_beacon()
         * and does not process Probe Request frames.
         */
        int (*set_ap_wps_ie)(const char *ifname, void *priv,
                             const struct wpabuf *beacon,
                             const struct wpabuf *proberesp);

        /**
         * 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
         * Returns: 0 on success, -1 on failure
         */
        int (*set_wds_sta)(void *priv, const u8 *addr, int aid, int val);

        /**
         * alloc_interface_addr - Allocate a virtual interface address
         * @priv: Private driver interface data
         * @addr: Buffer for returning the address
         * Returns: 0 on success, -1 on failure
         *
         * This command pre-allocates an interface address for a new virtual
         * interface. This can be used before creating a virtual interface if
         * the interface mode (e.g., AP vs. station) is not yet known, but the
         * address of the virtual interface is already needed. This helps with
         * drivers that cannot change interface mode without destroying and
         * re-creating the interface.
         *
         * The allocated address can be used in a bss_add() call to request a
         * specific bssid.
         */
        int (*alloc_interface_addr)(void *priv, u8 *addr);

        /**
         * release_interface_addr - Release a virtual interface address
         * @priv: Private driver interface data
         * @addr: Address to be freed from alloc_interface_addr()
         *
         * This command is used to release a virtual interface address that was
         * allocated with alloc_interface_addr(), but has not yet been used
         * with bss_add() to actually create the interface. This allows the
         * driver to release the pending allocation for a new interface.
         */
        void (*release_interface_addr)(void *priv, const u8 *addr);

        /**
         * 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);
};

/**
 * 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.
         */
        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_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.
         */
        EVENT_DEAUTH,

        /**
         * EVENT_ASSOC_REJECT - Association rejected
         *
         * This event should be called when (re)association attempt has been
         * rejected by the AP. Information about authentication result 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_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
};


/**
 * 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 {
                /**
                 * 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).
                 */
                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).
                 */
                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).
                 */
                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;
        } assoc_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 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];
                u16 auth_type;
                u16 status_code;
                const u8 *ies;
                size_t ies_len;
        } auth;

        /**
         * struct assoc_reject - Data for EVENT_ASSOC_REJECT events
         */
        struct assoc_reject {
                /**
                 * 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).
                 */
                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 *frame;
                size_t len;
        } rx_from_unknown;

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

        /**
         * 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;

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

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

/**
 * 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);

/**
 * wpa_supplicant_rx_eapol - Deliver a received EAPOL frame to wpa_supplicant
 * @ctx: Context pointer (wpa_s); this is the ctx variable registered
 *      with struct wpa_driver_ops::init()
 * @src_addr: Source address of the EAPOL frame
 * @buf: EAPOL data starting from the EAPOL header (i.e., no Ethernet header)
 * @len: Length of the EAPOL data
 *
 * This function is called for each received EAPOL frame. Most driver
 * interfaces rely on more generic OS mechanism for receiving frames through
 * l2_packet, but if such a mechanism is not available, the driver wrapper may
 * take care of received EAPOL frames and deliver them to the core supplicant
 * code by calling this function.
 */
void wpa_supplicant_rx_eapol(void *ctx, const u8 *src_addr,
                             const u8 *buf, size_t len);

const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie);
const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
                                  u32 vendor_type);
struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
                                             u32 vendor_type);
int wpa_scan_get_max_rate(const struct wpa_scan_res *res);
void wpa_scan_results_free(struct wpa_scan_results *res);
void wpa_scan_sort_results(struct wpa_scan_results *res);

/* hostapd functions for driver wrappers */

int hostapd_notif_new_sta(struct hostapd_data *hapd, const u8 *addr);
int hostapd_notif_assoc(struct hostapd_data *hapd, const u8 *addr,
                        const u8 *ie, size_t ielen);
void hostapd_notif_disassoc(struct hostapd_data *hapd, const u8 *addr);
void hostapd_eapol_receive(struct hostapd_data *hapd, const u8 *sa,
                           const u8 *buf, size_t len);

struct hostapd_data * hostapd_sta_get_bss(struct hostapd_data *hapd,
                                          const u8 *addr);

#endif /* DRIVER_H */