driver.h

WPA在Linux下实现的原代码 WPA在Linux下实现的原代码

/*
 * WPA Supplicant - driver interface definition
 * Copyright (c) 2003-2005, 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 2

#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
 * @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
 *
 * 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.
 */
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;
};

/**
 * 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 wpa_supplicant.h).
	 * 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;
};

/**
 * 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
	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
	unsigned int flags;
};


/**
 * 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
	 * configuration items are WPA IE (clearing it when WPA support is
	 * disabled), Privacy flag configuration for capability field (note:
	 * this the value need to set in associate handler to allow plaintext
	 * mode to be used) when trying to associate with, roaming mode (can
	 * allow wpa_supplicant to control roaming if ap_scan=1 is used;
	 * however, drivers can also implement roaming if desired, especially
	 * ap_scan=2 mode is used for this).
	 */
	int (*set_wpa)(void *priv, int enabled);

	/**
	 * set_key - Configure encryption key
	 * @priv: private driver interface data
	 * @alg: encryption algorithm (%WPA_ALG_NONE, %WPA_ALG_WEP,
	 *	%WPA_ALG_TKIP, %WPA_ALG_CCMP); %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
	 * @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
	 * @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)
	 *
	 * 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)(void *priv, 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);