driver.h

IEEE 802.11a/b/g 服务器端AP

/*
 * WPA Supplicant - driver interface definition
 * Copyright (c) 2003-2008, Jouni Malinen <[e-mail]>
 *
 * 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 3

#include "defs.h"

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

#define IEEE80211_MODE_INFRA	0
#define IEEE80211_MODE_IBSS	1

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

#define SSID_MAX_WPA_IE_LEN 40
/**
 * struct wpa_scan_result - Scan results (old structure)
 * @bssid: BSSID
 * @ssid: SSID
 * @ssid_len: length of the ssid
 * @wpa_ie: WPA IE
 * @wpa_ie_len: length of the wpa_ie
 * @rsn_ie: RSN IE
 * @rsn_ie_len: length of the RSN IE
 * @freq: frequency of the channel in MHz (e.g., 2412 = channel 1)
 * @caps: capability information field in host byte order
 * @qual: signal quality
 * @noise: noise level
 * @level: signal level
 * @maxrate: maximum supported rate
 * @mdie_present: Whether MDIE was included in Beacon/ProbeRsp frame
 * @mdie: Mobility domain identifier IE (IEEE 802.11r MDIE) (starting from
 * IE type field)
 * @tsf: Timestamp
 *
 * 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.
 *
 * This structure is the old data structure used for scan results. It is
 * obsoleted by the new struct wpa_scan_res structure and the old version is
 * only included for backwards compatibility with existing driver wrapper
 * implementations. New implementations are encouraged to implement for struct
 * wpa_scan_res. The old structure will be removed at some point.
 */
struct wpa_scan_result {
	u8 bssid[ETH_ALEN];
	u8 ssid[32];
	size_t ssid_len;
	u8 wpa_ie[SSID_MAX_WPA_IE_LEN];
	size_t wpa_ie_len;
	u8 rsn_ie[SSID_MAX_WPA_IE_LEN];
	size_t rsn_ie_len;
	int freq;
	u16 caps;
	int qual;
	int noise;
	int level;
	int maxrate;
	int mdie_present;
	u8 mdie[5];
	u64 tsf;
};


/**
 * struct wpa_scan_res - Scan result for an BSS/IBSS
 * @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
 * @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 {
	u8 bssid[ETH_ALEN];
	int freq;
	u16 beacon_int;
	u16 caps;
	int qual;
	int noise;
	int level;
	u64 tsf;
	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_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).
	 */
	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. */
	wpa_cipher pairwise_suite;
	wpa_cipher group_suite;
	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;
};

/**
 * 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
#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
	unsigned int flags;
};


#define WPA_CHAN_W_SCAN 0x00000001
#define WPA_CHAN_W_ACTIVE_SCAN 0x00000002
#define WPA_CHAN_W_IBSS 0x00000004

struct wpa_channel_data {
	short chan; /* channel number (IEEE 802.11) */
	short freq; /* frequency in MHz */
	int flag; /* flag for user space use (WPA_CHAN_*) */
};

#define WPA_RATE_ERP 0x00000001
#define WPA_RATE_BASIC 0x00000002
#define WPA_RATE_PREAMBLE2 0x00000004
#define WPA_RATE_SUPPORTED 0x00000010
#define WPA_RATE_OFDM 0x00000020
#define WPA_RATE_CCK 0x00000040
#define WPA_RATE_MANDATORY 0x00000100

struct wpa_rate_data {
	int rate; /* rate in 100 kbps */
	int flags; /* WPA_RATE_ flags */
};

typedef enum {
	WPA_MODE_IEEE80211B,
	WPA_MODE_IEEE80211G,
	WPA_MODE_IEEE80211A,
	NUM_WPA_MODES
} wpa_hw_mode;

struct wpa_hw_modes {
	wpa_hw_mode mode;
	int num_channels;
	struct wpa_channel_data *channels;
	int num_rates;
	struct wpa_rate_data *rates;
};


struct ieee80211_rx_status {
        int channel;
        int ssi;
};


/**
 * 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_wpa - Enable/disable WPA support (OBSOLETE)
	 * @priv: private driver interface data
	 * @enabled: 1 = enable, 0 = disable
	 *
	 * Returns: 0 on success, -1 on failure
	 *
	 * Note: This function is included for backwards compatibility. This is
	 * called only just after init and just before deinit, so these
	 * functions can be used to implement same functionality and the driver
	 * interface need not define this function.
	 *
	 * Configure the kernel driver to enable/disable WPA support. This may
	 * be empty function, if WPA support is always enabled. Common