driver_wext.c File Reference

WPA Supplicant - driver interaction with generic Linux Wireless Extensions. More...

#include "includes.h"
#include <sys/ioctl.h>
#include <net/if_arp.h>
#include "wireless_copy.h"
#include "common.h"
#include "driver.h"
#include "eloop.h"
#include "priv_netlink.h"
#include "driver_wext.h"
#include "ieee802_11_defs.h"
#include "wpa_common.h"

Data Structures

struct  wext_scan_data

Functions

int wpa_driver_wext_set_auth_param (struct wpa_driver_wext_data *drv, int idx, u32 value)
int wpa_driver_wext_get_bssid (void *priv, u8 *bssid)
 Get BSSID, SIOCGIWAP.
int wpa_driver_wext_set_bssid (void *priv, const u8 *bssid)
 Set BSSID, SIOCSIWAP.
int wpa_driver_wext_get_ssid (void *priv, u8 *ssid)
 Get SSID, SIOCGIWESSID.
int wpa_driver_wext_set_ssid (void *priv, const u8 *ssid, size_t ssid_len)
 Set SSID, SIOCSIWESSID.
int wpa_driver_wext_set_freq (void *priv, int freq)
 Set frequency/channel, SIOCSIWFREQ.
int wpa_driver_wext_get_ifflags (struct wpa_driver_wext_data *drv, int *flags)
 Get interface flags (SIOCGIFFLAGS).
int wpa_driver_wext_set_ifflags (struct wpa_driver_wext_data *drv, int flags)
 Set interface flags (SIOCSIFFLAGS).
void * wpa_driver_wext_init (void *ctx, const char *ifname)
 Initialize WE driver interface.
void wpa_driver_wext_deinit (void *priv)
 Deinitialize WE driver interface.
void wpa_driver_wext_scan_timeout (void *eloop_ctx, void *timeout_ctx)
 Scan timeout to report scan completion.
int wpa_driver_wext_scan (void *priv, struct wpa_driver_scan_params *params)
 Request the driver to initiate scan.
struct wpa_scan_results * wpa_driver_wext_get_scan_results (void *priv)
 Fetch the latest scan results.
int wpa_driver_wext_set_key (const char *ifname, 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)
 Configure encryption key.
int wpa_driver_wext_cipher2wext (int cipher)
int wpa_driver_wext_keymgmt2wext (int keymgmt)
int wpa_driver_wext_associate (void *priv, struct wpa_driver_associate_params *params)
int wpa_driver_wext_set_mode (void *priv, int mode)
 Set wireless mode (infra/adhoc), SIOCSIWMODE.
int wpa_driver_wext_get_capa (void *priv, struct wpa_driver_capa *capa)
int wpa_driver_wext_alternative_ifindex (struct wpa_driver_wext_data *drv, const char *ifname)
int wpa_driver_wext_set_operstate (void *priv, int state)
int wpa_driver_wext_get_version (struct wpa_driver_wext_data *drv)

Variables

struct wpa_driver_ops wpa_driver_wext_ops

Detailed Description

WPA Supplicant - driver interaction with generic Linux Wireless Extensions.

Copyright
Copyright (c) 2003-2007, 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.

This file implements a driver interface for the Linux Wireless Extensions. When used with WE-18 or newer, this interface can be used as-is with number of drivers. In addition to this, some of the common functions in this file can be used by other driver interface implementations that use generic WE ioctls, but require private ioctls for some of the functionality.

Function Documentation

void wpa_driver_wext_deinit ( void *  priv  ) 

Deinitialize WE driver interface.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()

Shut down driver interface and processing of driver events. Free private data buffer if one was allocated in wpa_driver_wext_init().

int wpa_driver_wext_get_bssid ( void *  priv,
u8 *  bssid 
)

Get BSSID, SIOCGIWAP.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
bssid Buffer for BSSID
Returns:
0 on success, -1 on failure
int wpa_driver_wext_get_ifflags ( struct wpa_driver_wext_data *  drv,
int *  flags 
)

Get interface flags (SIOCGIFFLAGS).

Parameters:
drv driver_wext private data
flags Pointer to returned flags value
Returns:
0 on success, -1 on failure
struct wpa_scan_results* wpa_driver_wext_get_scan_results ( void *  priv  )  [read]

Fetch the latest scan results.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
Returns:
Scan results on success, -1 on failure
int wpa_driver_wext_get_ssid ( void *  priv,
u8 *  ssid 
)

Get SSID, SIOCGIWESSID.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
ssid Buffer for the SSID; must be at least 32 bytes long
Returns:
SSID length on success, -1 on failure
void* wpa_driver_wext_init ( void *  ctx,
const char *  ifname 
)

Initialize WE driver interface.

Parameters:
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
int wpa_driver_wext_scan ( void *  priv,
struct wpa_driver_scan_params *  params 
)

Request the driver to initiate scan.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
param Scan parameters (specific SSID to scan for (ProbeReq), etc.)
Returns:
0 on success, -1 on failure
void wpa_driver_wext_scan_timeout ( void *  eloop_ctx,
void *  timeout_ctx 
)

Scan timeout to report scan completion.

Parameters:
eloop_ctx Unused
timeout_ctx ctx argument given to wpa_driver_wext_init()

This function can be used as registered timeout when starting a scan to generate a scan completed event if the driver does not report this.

int wpa_driver_wext_set_bssid ( void *  priv,
const u8 *  bssid 
)

Set BSSID, SIOCSIWAP.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
bssid BSSID
Returns:
0 on success, -1 on failure
int wpa_driver_wext_set_freq ( void *  priv,
int  freq 
)

Set frequency/channel, SIOCSIWFREQ.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
freq Frequency in MHz
Returns:
0 on success, -1 on failure
int wpa_driver_wext_set_ifflags ( struct wpa_driver_wext_data *  drv,
int  flags 
)

Set interface flags (SIOCSIFFLAGS).

Parameters:
drv driver_wext private data
flags New value for flags
Returns:
0 on success, -1 on failure
int wpa_driver_wext_set_key ( const char *  ifname,
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 
)

Configure encryption key.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
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

This function uses SIOCSIWENCODEEXT by default, but tries to use SIOCSIWENCODE if the extended ioctl fails when configuring a WEP key.

int wpa_driver_wext_set_mode ( void *  priv,
int  mode 
)

Set wireless mode (infra/adhoc), SIOCSIWMODE.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
mode 0 = infra/BSS (associate with an AP), 1 = adhoc/IBSS
Returns:
0 on success, -1 on failure
int wpa_driver_wext_set_ssid ( void *  priv,
const u8 *  ssid,
size_t  ssid_len 
)

Set SSID, SIOCSIWESSID.

Parameters:
priv Pointer to private wext data from wpa_driver_wext_init()
ssid SSID
ssid_len Length of SSID (0..32)
Returns:
0 on success, -1 on failure

Variable Documentation

struct wpa_driver_ops wpa_driver_wext_ops
Initial value:
 {
        .name = "wext",
        .desc = "Linux wireless extensions (generic)",
        .get_bssid = wpa_driver_wext_get_bssid,
        .get_ssid = wpa_driver_wext_get_ssid,
        .set_key = wpa_driver_wext_set_key,
        .set_countermeasures = wpa_driver_wext_set_countermeasures,
        .scan2 = wpa_driver_wext_scan,
        .get_scan_results2 = wpa_driver_wext_get_scan_results,
        .deauthenticate = wpa_driver_wext_deauthenticate,
        .disassociate = wpa_driver_wext_disassociate,
        .associate = wpa_driver_wext_associate,
        .init = wpa_driver_wext_init,
        .deinit = wpa_driver_wext_deinit,
        .add_pmkid = wpa_driver_wext_add_pmkid,
        .remove_pmkid = wpa_driver_wext_remove_pmkid,
        .flush_pmkid = wpa_driver_wext_flush_pmkid,
        .get_capa = wpa_driver_wext_get_capa,
        .set_operstate = wpa_driver_wext_set_operstate,
}
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