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* WPA Supplicant - driver interaction with Linux Host AP driver
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* Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* Alternatively, this software may be distributed under the terms of BSD
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* See README and COPYING for more details.
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#include <sys/ioctl.h>
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#include "wireless_copy.h"
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#include "driver_wext.h"
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#include "driver_hostap.h"
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struct wpa_driver_hostap_data {
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void *wext; /* private data for driver_wext */
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char ifname[IFNAMSIZ + 1];
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int current_mode; /* infra/adhoc */
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static int hostapd_ioctl(struct wpa_driver_hostap_data *drv,
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struct prism2_hostapd_param *param,
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int len, int show_err)
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os_memset(&iwr, 0, sizeof(iwr));
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os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
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iwr.u.data.pointer = (caddr_t) param;
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iwr.u.data.length = len;
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if (ioctl(drv->sock, PRISM2_IOCTL_HOSTAPD, &iwr) < 0) {
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perror("ioctl[PRISM2_IOCTL_HOSTAPD]");
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static int wpa_driver_hostap_set_wpa_ie(struct wpa_driver_hostap_data *drv,
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const u8 *wpa_ie, size_t wpa_ie_len)
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struct prism2_hostapd_param *param;
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size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + wpa_ie_len;
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if (blen < sizeof(*param))
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blen = sizeof(*param);
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param = os_zalloc(blen);
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param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT;
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param->u.generic_elem.len = wpa_ie_len;
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os_memcpy(param->u.generic_elem.data, wpa_ie, wpa_ie_len);
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res = hostapd_ioctl(drv, param, blen, 1);
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static int prism2param(struct wpa_driver_hostap_data *drv, int param,
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os_memset(&iwr, 0, sizeof(iwr));
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os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
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i = (int *) iwr.u.name;
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if (ioctl(drv->sock, PRISM2_IOCTL_PRISM2_PARAM, &iwr) < 0) {
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perror("ioctl[PRISM2_IOCTL_PRISM2_PARAM]");
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static int wpa_driver_hostap_set_wpa(void *priv, int enabled)
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struct wpa_driver_hostap_data *drv = priv;
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wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
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if (!enabled && wpa_driver_hostap_set_wpa_ie(drv, NULL, 0) < 0)
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if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING, enabled ? 2 : 0) < 0)
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if (prism2param(drv, PRISM2_PARAM_WPA, enabled) < 0)
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static void show_set_key_error(struct prism2_hostapd_param *param)
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switch (param->u.crypt.err) {
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case HOSTAP_CRYPT_ERR_UNKNOWN_ALG:
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wpa_printf(MSG_INFO, "Unknown algorithm '%s'.",
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wpa_printf(MSG_INFO, "You may need to load kernel module to "
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"register that algorithm.");
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wpa_printf(MSG_INFO, "E.g., 'modprobe hostap_crypt_wep' for "
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case HOSTAP_CRYPT_ERR_UNKNOWN_ADDR:
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wpa_printf(MSG_INFO, "Unknown address " MACSTR ".",
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MAC2STR(param->sta_addr));
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case HOSTAP_CRYPT_ERR_CRYPT_INIT_FAILED:
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wpa_printf(MSG_INFO, "Crypt algorithm initialization failed.");
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case HOSTAP_CRYPT_ERR_KEY_SET_FAILED:
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wpa_printf(MSG_INFO, "Key setting failed.");
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case HOSTAP_CRYPT_ERR_TX_KEY_SET_FAILED:
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wpa_printf(MSG_INFO, "TX key index setting failed.");
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case HOSTAP_CRYPT_ERR_CARD_CONF_FAILED:
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wpa_printf(MSG_INFO, "Card configuration failed.");
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static int wpa_driver_hostap_set_key(void *priv, wpa_alg alg,
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const u8 *addr, int key_idx,
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int set_tx, const u8 *seq, size_t seq_len,
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const u8 *key, size_t key_len)
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struct wpa_driver_hostap_data *drv = priv;
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struct prism2_hostapd_param *param;
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wpa_printf(MSG_DEBUG, "%s: alg=%s key_idx=%d set_tx=%d seq_len=%lu "
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"key_len=%lu", __FUNCTION__, alg_name, key_idx, set_tx,
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(unsigned long) seq_len, (unsigned long) key_len);
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blen = sizeof(*param) + key_len;
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buf = os_zalloc(blen);
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param = (struct prism2_hostapd_param *) buf;
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param->cmd = PRISM2_SET_ENCRYPTION;
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/* TODO: In theory, STA in client mode can use five keys; four default
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* keys for receiving (with keyidx 0..3) and one individual key for
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* both transmitting and receiving (keyidx 0) _unicast_ packets. Now,
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* keyidx 0 is reserved for this unicast use and default keys can only
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* use keyidx 1..3 (i.e., default key with keyidx 0 is not supported).
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* This should be fine for more or less all cases, but for completeness
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* sake, the driver could be enhanced to support the missing key. */
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os_memset(param->sta_addr, 0xff, ETH_ALEN);
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os_memcpy(param->sta_addr, addr, ETH_ALEN);
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os_memset(param->sta_addr, 0xff, ETH_ALEN);
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os_strlcpy((char *) param->u.crypt.alg, alg_name,
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HOSTAP_CRYPT_ALG_NAME_LEN);
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param->u.crypt.flags = set_tx ? HOSTAP_CRYPT_FLAG_SET_TX_KEY : 0;
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param->u.crypt.idx = key_idx;
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os_memcpy(param->u.crypt.seq, seq, seq_len);
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param->u.crypt.key_len = key_len;
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os_memcpy((u8 *) (param + 1), key, key_len);
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if (hostapd_ioctl(drv, param, blen, 1)) {
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wpa_printf(MSG_WARNING, "Failed to set encryption.");
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show_set_key_error(param);
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static int wpa_driver_hostap_set_countermeasures(void *priv, int enabled)
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struct wpa_driver_hostap_data *drv = priv;
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wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
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return prism2param(drv, PRISM2_PARAM_TKIP_COUNTERMEASURES, enabled);
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static int wpa_driver_hostap_set_drop_unencrypted(void *priv, int enabled)
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struct wpa_driver_hostap_data *drv = priv;
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wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
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return prism2param(drv, PRISM2_PARAM_DROP_UNENCRYPTED, enabled);
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static int wpa_driver_hostap_reset(struct wpa_driver_hostap_data *drv,
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wpa_printf(MSG_DEBUG, "%s: type=%d", __FUNCTION__, type);
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os_memset(&iwr, 0, sizeof(iwr));
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os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
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i = (int *) iwr.u.name;
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if (ioctl(drv->sock, PRISM2_IOCTL_RESET, &iwr) < 0) {
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perror("ioctl[PRISM2_IOCTL_RESET]");
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static int wpa_driver_hostap_mlme(struct wpa_driver_hostap_data *drv,
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const u8 *addr, int cmd, int reason_code)
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struct prism2_hostapd_param param;
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/* There does not seem to be a better way of deauthenticating or
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* disassociating with Prism2/2.5/3 than sending the management frame
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* and then resetting the Port0 to make sure both the AP and the STA
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* end up in disconnected state. */
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os_memset(¶m, 0, sizeof(param));
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param.cmd = PRISM2_HOSTAPD_MLME;
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os_memcpy(param.sta_addr, addr, ETH_ALEN);
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param.u.mlme.cmd = cmd;
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param.u.mlme.reason_code = reason_code;
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ret = hostapd_ioctl(drv, ¶m, sizeof(param), 1);
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ret = wpa_driver_hostap_reset(drv, 2);
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static int wpa_driver_hostap_deauthenticate(void *priv, const u8 *addr,
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struct wpa_driver_hostap_data *drv = priv;
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wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
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return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DEAUTH,
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static int wpa_driver_hostap_disassociate(void *priv, const u8 *addr,
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struct wpa_driver_hostap_data *drv = priv;
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wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
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return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DISASSOC,
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wpa_driver_hostap_associate(void *priv,
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struct wpa_driver_associate_params *params)
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struct wpa_driver_hostap_data *drv = priv;
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int allow_unencrypted_eapol;
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wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
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if (params->mode != drv->current_mode) {
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/* At the moment, Host AP driver requires host_roaming=2 for
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* infrastructure mode and host_roaming=0 for adhoc. */
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if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING,
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params->mode == IEEE80211_MODE_IBSS ? 0 : 2) <
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wpa_printf(MSG_DEBUG, "%s: failed to set host_roaming",
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drv->current_mode = params->mode;
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if (prism2param(drv, PRISM2_PARAM_PRIVACY_INVOKED,
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params->key_mgmt_suite != KEY_MGMT_NONE) < 0)
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if (wpa_driver_hostap_set_wpa_ie(drv, params->wpa_ie,
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params->wpa_ie_len) < 0)
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if (wpa_driver_wext_set_mode(drv->wext, params->mode) < 0)
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wpa_driver_wext_set_freq(drv->wext, params->freq) < 0)
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if (wpa_driver_wext_set_ssid(drv->wext, params->ssid, params->ssid_len)
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if (wpa_driver_wext_set_bssid(drv->wext, params->bssid) < 0)
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/* Allow unencrypted EAPOL messages even if pairwise keys are set when
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* not using WPA. IEEE 802.1X specifies that these frames are not
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* encrypted, but WPA encrypts them when pairwise keys are in use. */
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if (params->key_mgmt_suite == KEY_MGMT_802_1X ||
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params->key_mgmt_suite == KEY_MGMT_PSK)
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allow_unencrypted_eapol = 0;
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allow_unencrypted_eapol = 1;
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if (prism2param(drv, PRISM2_PARAM_IEEE_802_1X,
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allow_unencrypted_eapol) < 0) {
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wpa_printf(MSG_DEBUG, "hostap: Failed to configure "
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"ieee_802_1x param");
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/* Ignore this error.. driver_hostap.c can also be used with
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* other drivers that do not support this prism2_param. */
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static int wpa_driver_hostap_scan(void *priv, const u8 *ssid, size_t ssid_len)
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struct wpa_driver_hostap_data *drv = priv;
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struct prism2_hostapd_param param;
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/* Use standard Linux Wireless Extensions ioctl if possible
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* because some drivers using hostap code in wpa_supplicant
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* might not support Host AP specific scan request (with SSID
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return wpa_driver_wext_scan(drv->wext, ssid, ssid_len);
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os_memset(¶m, 0, sizeof(param));
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param.cmd = PRISM2_HOSTAPD_SCAN_REQ;
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param.u.scan_req.ssid_len = ssid_len;
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os_memcpy(param.u.scan_req.ssid, ssid, ssid_len);
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ret = hostapd_ioctl(drv, ¶m, sizeof(param), 1);
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/* Not all drivers generate "scan completed" wireless event, so try to
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* read results after a timeout. */
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eloop_cancel_timeout(wpa_driver_wext_scan_timeout, drv->wext,
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eloop_register_timeout(3, 0, wpa_driver_wext_scan_timeout, drv->wext,
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static int wpa_driver_hostap_set_auth_alg(void *priv, int auth_alg)
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struct wpa_driver_hostap_data *drv = priv;
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if (auth_alg & AUTH_ALG_OPEN_SYSTEM)
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if (auth_alg & AUTH_ALG_SHARED_KEY)
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if (auth_alg & AUTH_ALG_LEAP)
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algs = 1; /* at least one algorithm should be set */
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return prism2param(drv, PRISM2_PARAM_AP_AUTH_ALGS, algs);
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static int wpa_driver_hostap_get_bssid(void *priv, u8 *bssid)
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struct wpa_driver_hostap_data *drv = priv;
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return wpa_driver_wext_get_bssid(drv->wext, bssid);
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static int wpa_driver_hostap_get_ssid(void *priv, u8 *ssid)
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struct wpa_driver_hostap_data *drv = priv;
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return wpa_driver_wext_get_ssid(drv->wext, ssid);
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static struct wpa_scan_results * wpa_driver_hostap_get_scan_results(void *priv)
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struct wpa_driver_hostap_data *drv = priv;
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return wpa_driver_wext_get_scan_results(drv->wext);
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static int wpa_driver_hostap_set_operstate(void *priv, int state)
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struct wpa_driver_hostap_data *drv = priv;
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return wpa_driver_wext_set_operstate(drv->wext, state);
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static void * wpa_driver_hostap_init(void *ctx, const char *ifname)
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struct wpa_driver_hostap_data *drv;
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drv = os_zalloc(sizeof(*drv));
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drv->wext = wpa_driver_wext_init(ctx, ifname);
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if (drv->wext == NULL) {
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os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
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drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
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wpa_driver_wext_deinit(drv->wext);
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if (os_strncmp(ifname, "wlan", 4) == 0) {
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* Host AP driver may use both wlan# and wifi# interface in
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char ifname2[IFNAMSIZ + 1];
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os_strlcpy(ifname2, ifname, sizeof(ifname2));
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os_memcpy(ifname2, "wifi", 4);
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wpa_driver_wext_alternative_ifindex(drv->wext, ifname2);
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static void wpa_driver_hostap_deinit(void *priv)
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struct wpa_driver_hostap_data *drv = priv;
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wpa_driver_wext_deinit(drv->wext);
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const struct wpa_driver_ops wpa_driver_hostap_ops = {
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.desc = "Host AP driver (Intersil Prism2/2.5/3)",
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.get_bssid = wpa_driver_hostap_get_bssid,
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.get_ssid = wpa_driver_hostap_get_ssid,
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.set_wpa = wpa_driver_hostap_set_wpa,
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.set_key = wpa_driver_hostap_set_key,
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.set_countermeasures = wpa_driver_hostap_set_countermeasures,
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.set_drop_unencrypted = wpa_driver_hostap_set_drop_unencrypted,
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.scan = wpa_driver_hostap_scan,
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.get_scan_results2 = wpa_driver_hostap_get_scan_results,
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.deauthenticate = wpa_driver_hostap_deauthenticate,
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.disassociate = wpa_driver_hostap_disassociate,
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.associate = wpa_driver_hostap_associate,
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.set_auth_alg = wpa_driver_hostap_set_auth_alg,
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.init = wpa_driver_hostap_init,
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.deinit = wpa_driver_hostap_deinit,
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.set_operstate = wpa_driver_hostap_set_operstate,