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driver_hostap.c
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driver_hostap.c
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/*
* WPA Supplicant - driver interaction with Linux Host AP driver
* Copyright (c) 2003-2005, Jouni Malinen <[email protected]>
*
* 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.
*/
#include "includes.h"
#include <sys/ioctl.h>
#include "wireless_copy.h"
#include "common.h"
#include "driver.h"
#include "driver_wext.h"
#include "eloop.h"
#include "driver_hostap.h"
#include "l2_packet.h"
#include "wpa_supplicant.h"
struct wpa_driver_hostap_data {
void *wext; /* private data for driver_wext */
void *ctx;
char ifname[IFNAMSIZ + 1];
int sock;
int current_mode; /* infra/adhoc */
};
static int hostapd_ioctl(struct wpa_driver_hostap_data *drv,
struct prism2_hostapd_param *param,
int len, int show_err)
{
struct iwreq iwr;
os_memset(&iwr, 0, sizeof(iwr));
os_strncpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
iwr.u.data.pointer = (caddr_t) param;
iwr.u.data.length = len;
if (ioctl(drv->sock, PRISM2_IOCTL_HOSTAPD, &iwr) < 0) {
int ret = errno;
if (show_err)
perror("ioctl[PRISM2_IOCTL_HOSTAPD]");
return ret;
}
return 0;
}
static int wpa_driver_hostap_set_wpa_ie(struct wpa_driver_hostap_data *drv,
const u8 *wpa_ie, size_t wpa_ie_len)
{
struct prism2_hostapd_param *param;
int res;
size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + wpa_ie_len;
if (blen < sizeof(*param))
blen = sizeof(*param);
param = os_zalloc(blen);
if (param == NULL)
return -1;
param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT;
param->u.generic_elem.len = wpa_ie_len;
os_memcpy(param->u.generic_elem.data, wpa_ie, wpa_ie_len);
res = hostapd_ioctl(drv, param, blen, 1);
os_free(param);
return res;
}
static int prism2param(struct wpa_driver_hostap_data *drv, int param,
int value)
{
struct iwreq iwr;
int *i, ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strncpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
i = (int *) iwr.u.name;
*i++ = param;
*i++ = value;
if (ioctl(drv->sock, PRISM2_IOCTL_PRISM2_PARAM, &iwr) < 0) {
perror("ioctl[PRISM2_IOCTL_PRISM2_PARAM]");
ret = -1;
}
return ret;
}
static int wpa_driver_hostap_set_wpa(void *priv, int enabled)
{
struct wpa_driver_hostap_data *drv = priv;
int ret = 0;
wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
if (!enabled && wpa_driver_hostap_set_wpa_ie(drv, NULL, 0) < 0)
ret = -1;
if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING, enabled ? 2 : 0) < 0)
ret = -1;
if (prism2param(drv, PRISM2_PARAM_WPA, enabled) < 0)
ret = -1;
return ret;
}
static void show_set_key_error(struct prism2_hostapd_param *param)
{
switch (param->u.crypt.err) {
case HOSTAP_CRYPT_ERR_UNKNOWN_ALG:
wpa_printf(MSG_INFO, "Unknown algorithm '%s'.",
param->u.crypt.alg);
wpa_printf(MSG_INFO, "You may need to load kernel module to "
"register that algorithm.");
wpa_printf(MSG_INFO, "E.g., 'modprobe hostap_crypt_wep' for "
"WEP.");
break;
case HOSTAP_CRYPT_ERR_UNKNOWN_ADDR:
wpa_printf(MSG_INFO, "Unknown address " MACSTR ".",
MAC2STR(param->sta_addr));
break;
case HOSTAP_CRYPT_ERR_CRYPT_INIT_FAILED:
wpa_printf(MSG_INFO, "Crypt algorithm initialization failed.");
break;
case HOSTAP_CRYPT_ERR_KEY_SET_FAILED:
wpa_printf(MSG_INFO, "Key setting failed.");
break;
case HOSTAP_CRYPT_ERR_TX_KEY_SET_FAILED:
wpa_printf(MSG_INFO, "TX key index setting failed.");
break;
case HOSTAP_CRYPT_ERR_CARD_CONF_FAILED:
wpa_printf(MSG_INFO, "Card configuration failed.");
break;
}
}
static int wpa_driver_hostap_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)
{
struct wpa_driver_hostap_data *drv = priv;
struct prism2_hostapd_param *param;
u8 *buf;
size_t blen;
int ret = 0;
char *alg_name;
switch (alg) {
case WPA_ALG_NONE:
alg_name = "none";
break;
case WPA_ALG_WEP:
alg_name = "WEP";
break;
case WPA_ALG_TKIP:
alg_name = "TKIP";
break;
case WPA_ALG_CCMP:
alg_name = "CCMP";
break;
default:
return -1;
}
wpa_printf(MSG_DEBUG, "%s: alg=%s key_idx=%d set_tx=%d seq_len=%lu "
"key_len=%lu", __FUNCTION__, alg_name, key_idx, set_tx,
(unsigned long) seq_len, (unsigned long) key_len);
if (seq_len > 8)
return -2;
blen = sizeof(*param) + key_len;
buf = os_zalloc(blen);
if (buf == NULL)
return -1;
param = (struct prism2_hostapd_param *) buf;
param->cmd = PRISM2_SET_ENCRYPTION;
/* TODO: In theory, STA in client mode can use five keys; four default
* keys for receiving (with keyidx 0..3) and one individual key for
* both transmitting and receiving (keyidx 0) _unicast_ packets. Now,
* keyidx 0 is reserved for this unicast use and default keys can only
* use keyidx 1..3 (i.e., default key with keyidx 0 is not supported).
* This should be fine for more or less all cases, but for completeness
* sake, the driver could be enhanced to support the missing key. */
#if 0
if (addr == NULL)
os_memset(param->sta_addr, 0xff, ETH_ALEN);
else
os_memcpy(param->sta_addr, addr, ETH_ALEN);
#else
os_memset(param->sta_addr, 0xff, ETH_ALEN);
#endif
os_strncpy((char *) param->u.crypt.alg, alg_name,
HOSTAP_CRYPT_ALG_NAME_LEN);
param->u.crypt.flags = set_tx ? HOSTAP_CRYPT_FLAG_SET_TX_KEY : 0;
param->u.crypt.idx = key_idx;
os_memcpy(param->u.crypt.seq, seq, seq_len);
param->u.crypt.key_len = key_len;
os_memcpy((u8 *) (param + 1), key, key_len);
if (hostapd_ioctl(drv, param, blen, 1)) {
wpa_printf(MSG_WARNING, "Failed to set encryption.");
show_set_key_error(param);
ret = -1;
}
os_free(buf);
return ret;
}
static int wpa_driver_hostap_set_countermeasures(void *priv, int enabled)
{
struct wpa_driver_hostap_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
return prism2param(drv, PRISM2_PARAM_TKIP_COUNTERMEASURES, enabled);
}
static int wpa_driver_hostap_set_drop_unencrypted(void *priv, int enabled)
{
struct wpa_driver_hostap_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
return prism2param(drv, PRISM2_PARAM_DROP_UNENCRYPTED, enabled);
}
static int wpa_driver_hostap_reset(struct wpa_driver_hostap_data *drv,
int type)
{
struct iwreq iwr;
int *i, ret = 0;
wpa_printf(MSG_DEBUG, "%s: type=%d", __FUNCTION__, type);
os_memset(&iwr, 0, sizeof(iwr));
os_strncpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
i = (int *) iwr.u.name;
*i++ = type;
if (ioctl(drv->sock, PRISM2_IOCTL_RESET, &iwr) < 0) {
perror("ioctl[PRISM2_IOCTL_RESET]");
ret = -1;
}
return ret;
}
static int wpa_driver_hostap_mlme(struct wpa_driver_hostap_data *drv,
const u8 *addr, int cmd, int reason_code)
{
struct prism2_hostapd_param param;
int ret;
/* There does not seem to be a better way of deauthenticating or
* disassociating with Prism2/2.5/3 than sending the management frame
* and then resetting the Port0 to make sure both the AP and the STA
* end up in disconnected state. */
os_memset(¶m, 0, sizeof(param));
param.cmd = PRISM2_HOSTAPD_MLME;
os_memcpy(param.sta_addr, addr, ETH_ALEN);
param.u.mlme.cmd = cmd;
param.u.mlme.reason_code = reason_code;
ret = hostapd_ioctl(drv, ¶m, sizeof(param), 1);
if (ret == 0) {
os_sleep(0, 100000);
ret = wpa_driver_hostap_reset(drv, 2);
}
return ret;
}
static int wpa_driver_hostap_deauthenticate(void *priv, const u8 *addr,
int reason_code)
{
struct wpa_driver_hostap_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DEAUTH,
reason_code);
}
static int wpa_driver_hostap_disassociate(void *priv, const u8 *addr,
int reason_code)
{
struct wpa_driver_hostap_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DISASSOC,
reason_code);
}
static int
wpa_driver_hostap_associate(void *priv,
struct wpa_driver_associate_params *params)
{
struct wpa_driver_hostap_data *drv = priv;
int ret = 0;
int allow_unencrypted_eapol;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
if (params->mode != drv->current_mode) {
/* At the moment, Host AP driver requires host_roaming=2 for
* infrastructure mode and host_roaming=0 for adhoc. */
if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING,
params->mode == IEEE80211_MODE_IBSS ? 0 : 2) <
0) {
wpa_printf(MSG_DEBUG, "%s: failed to set host_roaming",
__func__);
}
drv->current_mode = params->mode;
}
if (prism2param(drv, PRISM2_PARAM_PRIVACY_INVOKED,
params->key_mgmt_suite != KEY_MGMT_NONE) < 0)
ret = -1;
if (wpa_driver_hostap_set_wpa_ie(drv, params->wpa_ie,
params->wpa_ie_len) < 0)
ret = -1;
if (wpa_driver_wext_set_mode(drv->wext, params->mode) < 0)
ret = -1;
if (params->freq &&
wpa_driver_wext_set_freq(drv->wext, params->freq) < 0)
ret = -1;
if (wpa_driver_wext_set_ssid(drv->wext, params->ssid, params->ssid_len)
< 0)
ret = -1;
if (wpa_driver_wext_set_bssid(drv->wext, params->bssid) < 0)
ret = -1;
/* Allow unencrypted EAPOL messages even if pairwise keys are set when
* not using WPA. IEEE 802.1X specifies that these frames are not
* encrypted, but WPA encrypts them when pairwise keys are in use. */
if (params->key_mgmt_suite == KEY_MGMT_802_1X ||
params->key_mgmt_suite == KEY_MGMT_PSK)
allow_unencrypted_eapol = 0;
else
allow_unencrypted_eapol = 1;
if (prism2param(drv, PRISM2_PARAM_IEEE_802_1X,
allow_unencrypted_eapol) < 0) {
wpa_printf(MSG_DEBUG, "hostap: Failed to configure "
"ieee_802_1x param");
/* Ignore this error.. driver_hostap.c can also be used with
* other drivers that do not support this prism2_param. */
}
return ret;
}
static int wpa_driver_hostap_scan(void *priv, const u8 *ssid, size_t ssid_len)
{
struct wpa_driver_hostap_data *drv = priv;
struct prism2_hostapd_param param;
int ret;
if (ssid == NULL) {
/* Use standard Linux Wireless Extensions ioctl if possible
* because some drivers using hostap code in wpa_supplicant
* might not support Host AP specific scan request (with SSID
* info). */
return wpa_driver_wext_scan(drv->wext, ssid, ssid_len);
}
if (ssid_len > 32)
ssid_len = 32;
os_memset(¶m, 0, sizeof(param));
param.cmd = PRISM2_HOSTAPD_SCAN_REQ;
param.u.scan_req.ssid_len = ssid_len;
os_memcpy(param.u.scan_req.ssid, ssid, ssid_len);
ret = hostapd_ioctl(drv, ¶m, sizeof(param), 1);
/* Not all drivers generate "scan completed" wireless event, so try to
* read results after a timeout. */
eloop_cancel_timeout(wpa_driver_wext_scan_timeout, drv->wext,
drv->ctx);
eloop_register_timeout(3, 0, wpa_driver_wext_scan_timeout, drv->wext,
drv->ctx);
return ret;
}
static int wpa_driver_hostap_set_auth_alg(void *priv, int auth_alg)
{
struct wpa_driver_hostap_data *drv = priv;
int algs = 0;
if (auth_alg & AUTH_ALG_OPEN_SYSTEM)
algs |= 1;
if (auth_alg & AUTH_ALG_SHARED_KEY)
algs |= 2;
if (auth_alg & AUTH_ALG_LEAP)
algs |= 4;
if (algs == 0)
algs = 1; /* at least one algorithm should be set */
return prism2param(drv, PRISM2_PARAM_AP_AUTH_ALGS, algs);
}
static int wpa_driver_hostap_get_bssid(void *priv, u8 *bssid)
{
struct wpa_driver_hostap_data *drv = priv;
return wpa_driver_wext_get_bssid(drv->wext, bssid);
}
static int wpa_driver_hostap_get_ssid(void *priv, u8 *ssid)
{
struct wpa_driver_hostap_data *drv = priv;
return wpa_driver_wext_get_ssid(drv->wext, ssid);
}
static int wpa_driver_hostap_get_scan_results(void *priv,
struct wpa_scan_result *results,
size_t max_size)
{
struct wpa_driver_hostap_data *drv = priv;
return wpa_driver_wext_get_scan_results(drv->wext, results, max_size);
}
static int wpa_driver_hostap_set_operstate(void *priv, int state)
{
struct wpa_driver_hostap_data *drv = priv;
return wpa_driver_wext_set_operstate(drv->wext, state);
}
static void * wpa_driver_hostap_init(void *ctx, const char *ifname)
{
struct wpa_driver_hostap_data *drv;
drv = os_zalloc(sizeof(*drv));
if (drv == NULL)
return NULL;
drv->wext = wpa_driver_wext_init(ctx, ifname);
if (drv->wext == NULL) {
os_free(drv);
return NULL;
}
drv->ctx = ctx;
os_strncpy(drv->ifname, ifname, sizeof(drv->ifname));
drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
if (drv->sock < 0) {
perror("socket");
wpa_driver_wext_deinit(drv->wext);
os_free(drv);
return NULL;
}
if (os_strncmp(ifname, "wlan", 4) == 0) {
/*
* Host AP driver may use both wlan# and wifi# interface in
* wireless events.
*/
char ifname2[IFNAMSIZ + 1];
os_strncpy(ifname2, ifname, sizeof(ifname2));
os_memcpy(ifname2, "wifi", 4);
wpa_driver_wext_alternative_ifindex(drv->wext, ifname2);
}
return drv;
}
static void wpa_driver_hostap_deinit(void *priv)
{
struct wpa_driver_hostap_data *drv = priv;
wpa_driver_wext_deinit(drv->wext);
close(drv->sock);
os_free(drv);
}
const struct wpa_driver_ops wpa_driver_hostap_ops = {
.name = "hostap",
.desc = "Host AP driver (Intersil Prism2/2.5/3)",
.get_bssid = wpa_driver_hostap_get_bssid,
.get_ssid = wpa_driver_hostap_get_ssid,
.set_wpa = wpa_driver_hostap_set_wpa,
.set_key = wpa_driver_hostap_set_key,
.set_countermeasures = wpa_driver_hostap_set_countermeasures,
.set_drop_unencrypted = wpa_driver_hostap_set_drop_unencrypted,
.scan = wpa_driver_hostap_scan,
.get_scan_results = wpa_driver_hostap_get_scan_results,
.deauthenticate = wpa_driver_hostap_deauthenticate,
.disassociate = wpa_driver_hostap_disassociate,
.associate = wpa_driver_hostap_associate,
.set_auth_alg = wpa_driver_hostap_set_auth_alg,
.init = wpa_driver_hostap_init,
.deinit = wpa_driver_hostap_deinit,
.set_operstate = wpa_driver_hostap_set_operstate,
};