/* * WPA Supplicant - driver interaction with Linux Host AP driver * Copyright (c) 2003-2005, 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. */ #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" 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_strlcpy(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_strlcpy(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_strlcpy((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_strlcpy(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 struct wpa_scan_results * wpa_driver_hostap_get_scan_results(void *priv) { struct wpa_driver_hostap_data *drv = priv; return wpa_driver_wext_get_scan_results(drv->wext); } 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_strlcpy(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_strlcpy(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_results2 = 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, };