1 /* 2 * WPA Supplicant - driver interaction with Linux Host AP driver 3 * Copyright (c) 2003-2005, Jouni Malinen <j (at) w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 #include <sys/ioctl.h> 17 18 #include "wireless_copy.h" 19 #include "common.h" 20 #include "driver.h" 21 #include "driver_wext.h" 22 #include "eloop.h" 23 #include "driver_hostap.h" 24 25 26 struct wpa_driver_hostap_data { 27 void *wext; /* private data for driver_wext */ 28 void *ctx; 29 char ifname[IFNAMSIZ + 1]; 30 int sock; 31 int current_mode; /* infra/adhoc */ 32 }; 33 34 35 static int hostapd_ioctl(struct wpa_driver_hostap_data *drv, 36 struct prism2_hostapd_param *param, 37 int len, int show_err) 38 { 39 struct iwreq iwr; 40 41 os_memset(&iwr, 0, sizeof(iwr)); 42 os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ); 43 iwr.u.data.pointer = (caddr_t) param; 44 iwr.u.data.length = len; 45 46 if (ioctl(drv->sock, PRISM2_IOCTL_HOSTAPD, &iwr) < 0) { 47 int ret = errno; 48 if (show_err) 49 perror("ioctl[PRISM2_IOCTL_HOSTAPD]"); 50 return ret; 51 } 52 53 return 0; 54 } 55 56 57 static int wpa_driver_hostap_set_wpa_ie(struct wpa_driver_hostap_data *drv, 58 const u8 *wpa_ie, size_t wpa_ie_len) 59 { 60 struct prism2_hostapd_param *param; 61 int res; 62 size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + wpa_ie_len; 63 if (blen < sizeof(*param)) 64 blen = sizeof(*param); 65 66 param = os_zalloc(blen); 67 if (param == NULL) 68 return -1; 69 70 param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT; 71 param->u.generic_elem.len = wpa_ie_len; 72 os_memcpy(param->u.generic_elem.data, wpa_ie, wpa_ie_len); 73 res = hostapd_ioctl(drv, param, blen, 1); 74 75 os_free(param); 76 77 return res; 78 } 79 80 81 static int prism2param(struct wpa_driver_hostap_data *drv, int param, 82 int value) 83 { 84 struct iwreq iwr; 85 int *i, ret = 0; 86 87 os_memset(&iwr, 0, sizeof(iwr)); 88 os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ); 89 i = (int *) iwr.u.name; 90 *i++ = param; 91 *i++ = value; 92 93 if (ioctl(drv->sock, PRISM2_IOCTL_PRISM2_PARAM, &iwr) < 0) { 94 perror("ioctl[PRISM2_IOCTL_PRISM2_PARAM]"); 95 ret = -1; 96 } 97 return ret; 98 } 99 100 101 static int wpa_driver_hostap_set_wpa(void *priv, int enabled) 102 { 103 struct wpa_driver_hostap_data *drv = priv; 104 int ret = 0; 105 106 wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled); 107 108 if (!enabled && wpa_driver_hostap_set_wpa_ie(drv, NULL, 0) < 0) 109 ret = -1; 110 if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING, enabled ? 2 : 0) < 0) 111 ret = -1; 112 if (prism2param(drv, PRISM2_PARAM_WPA, enabled) < 0) 113 ret = -1; 114 115 return ret; 116 } 117 118 119 static void show_set_key_error(struct prism2_hostapd_param *param) 120 { 121 switch (param->u.crypt.err) { 122 case HOSTAP_CRYPT_ERR_UNKNOWN_ALG: 123 wpa_printf(MSG_INFO, "Unknown algorithm '%s'.", 124 param->u.crypt.alg); 125 wpa_printf(MSG_INFO, "You may need to load kernel module to " 126 "register that algorithm."); 127 wpa_printf(MSG_INFO, "E.g., 'modprobe hostap_crypt_wep' for " 128 "WEP."); 129 break; 130 case HOSTAP_CRYPT_ERR_UNKNOWN_ADDR: 131 wpa_printf(MSG_INFO, "Unknown address " MACSTR ".", 132 MAC2STR(param->sta_addr)); 133 break; 134 case HOSTAP_CRYPT_ERR_CRYPT_INIT_FAILED: 135 wpa_printf(MSG_INFO, "Crypt algorithm initialization failed."); 136 break; 137 case HOSTAP_CRYPT_ERR_KEY_SET_FAILED: 138 wpa_printf(MSG_INFO, "Key setting failed."); 139 break; 140 case HOSTAP_CRYPT_ERR_TX_KEY_SET_FAILED: 141 wpa_printf(MSG_INFO, "TX key index setting failed."); 142 break; 143 case HOSTAP_CRYPT_ERR_CARD_CONF_FAILED: 144 wpa_printf(MSG_INFO, "Card configuration failed."); 145 break; 146 } 147 } 148 149 150 static int wpa_driver_hostap_set_key(void *priv, wpa_alg alg, 151 const u8 *addr, int key_idx, 152 int set_tx, const u8 *seq, size_t seq_len, 153 const u8 *key, size_t key_len) 154 { 155 struct wpa_driver_hostap_data *drv = priv; 156 struct prism2_hostapd_param *param; 157 u8 *buf; 158 size_t blen; 159 int ret = 0; 160 char *alg_name; 161 162 switch (alg) { 163 case WPA_ALG_NONE: 164 alg_name = "none"; 165 break; 166 case WPA_ALG_WEP: 167 alg_name = "WEP"; 168 break; 169 case WPA_ALG_TKIP: 170 alg_name = "TKIP"; 171 break; 172 case WPA_ALG_CCMP: 173 alg_name = "CCMP"; 174 break; 175 default: 176 return -1; 177 } 178 179 wpa_printf(MSG_DEBUG, "%s: alg=%s key_idx=%d set_tx=%d seq_len=%lu " 180 "key_len=%lu", __FUNCTION__, alg_name, key_idx, set_tx, 181 (unsigned long) seq_len, (unsigned long) key_len); 182 183 if (seq_len > 8) 184 return -2; 185 186 blen = sizeof(*param) + key_len; 187 buf = os_zalloc(blen); 188 if (buf == NULL) 189 return -1; 190 191 param = (struct prism2_hostapd_param *) buf; 192 param->cmd = PRISM2_SET_ENCRYPTION; 193 /* TODO: In theory, STA in client mode can use five keys; four default 194 * keys for receiving (with keyidx 0..3) and one individual key for 195 * both transmitting and receiving (keyidx 0) _unicast_ packets. Now, 196 * keyidx 0 is reserved for this unicast use and default keys can only 197 * use keyidx 1..3 (i.e., default key with keyidx 0 is not supported). 198 * This should be fine for more or less all cases, but for completeness 199 * sake, the driver could be enhanced to support the missing key. */ 200 #if 0 201 if (addr == NULL) 202 os_memset(param->sta_addr, 0xff, ETH_ALEN); 203 else 204 os_memcpy(param->sta_addr, addr, ETH_ALEN); 205 #else 206 os_memset(param->sta_addr, 0xff, ETH_ALEN); 207 #endif 208 os_strlcpy((char *) param->u.crypt.alg, alg_name, 209 HOSTAP_CRYPT_ALG_NAME_LEN); 210 param->u.crypt.flags = set_tx ? HOSTAP_CRYPT_FLAG_SET_TX_KEY : 0; 211 param->u.crypt.idx = key_idx; 212 os_memcpy(param->u.crypt.seq, seq, seq_len); 213 param->u.crypt.key_len = key_len; 214 os_memcpy((u8 *) (param + 1), key, key_len); 215 216 if (hostapd_ioctl(drv, param, blen, 1)) { 217 wpa_printf(MSG_WARNING, "Failed to set encryption."); 218 show_set_key_error(param); 219 ret = -1; 220 } 221 os_free(buf); 222 223 return ret; 224 } 225 226 227 static int wpa_driver_hostap_set_countermeasures(void *priv, int enabled) 228 { 229 struct wpa_driver_hostap_data *drv = priv; 230 wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled); 231 return prism2param(drv, PRISM2_PARAM_TKIP_COUNTERMEASURES, enabled); 232 } 233 234 235 static int wpa_driver_hostap_set_drop_unencrypted(void *priv, int enabled) 236 { 237 struct wpa_driver_hostap_data *drv = priv; 238 wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled); 239 return prism2param(drv, PRISM2_PARAM_DROP_UNENCRYPTED, enabled); 240 } 241 242 243 static int wpa_driver_hostap_reset(struct wpa_driver_hostap_data *drv, 244 int type) 245 { 246 struct iwreq iwr; 247 int *i, ret = 0; 248 249 wpa_printf(MSG_DEBUG, "%s: type=%d", __FUNCTION__, type); 250 251 os_memset(&iwr, 0, sizeof(iwr)); 252 os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ); 253 i = (int *) iwr.u.name; 254 *i++ = type; 255 256 if (ioctl(drv->sock, PRISM2_IOCTL_RESET, &iwr) < 0) { 257 perror("ioctl[PRISM2_IOCTL_RESET]"); 258 ret = -1; 259 } 260 return ret; 261 } 262 263 264 static int wpa_driver_hostap_mlme(struct wpa_driver_hostap_data *drv, 265 const u8 *addr, int cmd, int reason_code) 266 { 267 struct prism2_hostapd_param param; 268 int ret; 269 270 /* There does not seem to be a better way of deauthenticating or 271 * disassociating with Prism2/2.5/3 than sending the management frame 272 * and then resetting the Port0 to make sure both the AP and the STA 273 * end up in disconnected state. */ 274 os_memset(¶m, 0, sizeof(param)); 275 param.cmd = PRISM2_HOSTAPD_MLME; 276 os_memcpy(param.sta_addr, addr, ETH_ALEN); 277 param.u.mlme.cmd = cmd; 278 param.u.mlme.reason_code = reason_code; 279 ret = hostapd_ioctl(drv, ¶m, sizeof(param), 1); 280 if (ret == 0) { 281 os_sleep(0, 100000); 282 ret = wpa_driver_hostap_reset(drv, 2); 283 } 284 return ret; 285 } 286 287 288 static int wpa_driver_hostap_deauthenticate(void *priv, const u8 *addr, 289 int reason_code) 290 { 291 struct wpa_driver_hostap_data *drv = priv; 292 wpa_printf(MSG_DEBUG, "%s", __FUNCTION__); 293 return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DEAUTH, 294 reason_code); 295 } 296 297 298 static int wpa_driver_hostap_disassociate(void *priv, const u8 *addr, 299 int reason_code) 300 { 301 struct wpa_driver_hostap_data *drv = priv; 302 wpa_printf(MSG_DEBUG, "%s", __FUNCTION__); 303 return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DISASSOC, 304 reason_code); 305 } 306 307 308 static int 309 wpa_driver_hostap_associate(void *priv, 310 struct wpa_driver_associate_params *params) 311 { 312 struct wpa_driver_hostap_data *drv = priv; 313 int ret = 0; 314 int allow_unencrypted_eapol; 315 316 wpa_printf(MSG_DEBUG, "%s", __FUNCTION__); 317 318 if (params->mode != drv->current_mode) { 319 /* At the moment, Host AP driver requires host_roaming=2 for 320 * infrastructure mode and host_roaming=0 for adhoc. */ 321 if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING, 322 params->mode == IEEE80211_MODE_IBSS ? 0 : 2) < 323 0) { 324 wpa_printf(MSG_DEBUG, "%s: failed to set host_roaming", 325 __func__); 326 } 327 drv->current_mode = params->mode; 328 } 329 330 if (prism2param(drv, PRISM2_PARAM_PRIVACY_INVOKED, 331 params->key_mgmt_suite != KEY_MGMT_NONE) < 0) 332 ret = -1; 333 if (wpa_driver_hostap_set_wpa_ie(drv, params->wpa_ie, 334 params->wpa_ie_len) < 0) 335 ret = -1; 336 if (wpa_driver_wext_set_mode(drv->wext, params->mode) < 0) 337 ret = -1; 338 if (params->freq && 339 wpa_driver_wext_set_freq(drv->wext, params->freq) < 0) 340 ret = -1; 341 if (wpa_driver_wext_set_ssid(drv->wext, params->ssid, params->ssid_len) 342 < 0) 343 ret = -1; 344 if (wpa_driver_wext_set_bssid(drv->wext, params->bssid) < 0) 345 ret = -1; 346 347 /* Allow unencrypted EAPOL messages even if pairwise keys are set when 348 * not using WPA. IEEE 802.1X specifies that these frames are not 349 * encrypted, but WPA encrypts them when pairwise keys are in use. */ 350 if (params->key_mgmt_suite == KEY_MGMT_802_1X || 351 params->key_mgmt_suite == KEY_MGMT_PSK) 352 allow_unencrypted_eapol = 0; 353 else 354 allow_unencrypted_eapol = 1; 355 356 if (prism2param(drv, PRISM2_PARAM_IEEE_802_1X, 357 allow_unencrypted_eapol) < 0) { 358 wpa_printf(MSG_DEBUG, "hostap: Failed to configure " 359 "ieee_802_1x param"); 360 /* Ignore this error.. driver_hostap.c can also be used with 361 * other drivers that do not support this prism2_param. */ 362 } 363 364 return ret; 365 } 366 367 368 static int wpa_driver_hostap_scan(void *priv, const u8 *ssid, size_t ssid_len) 369 { 370 struct wpa_driver_hostap_data *drv = priv; 371 struct prism2_hostapd_param param; 372 int ret; 373 374 if (ssid == NULL) { 375 /* Use standard Linux Wireless Extensions ioctl if possible 376 * because some drivers using hostap code in wpa_supplicant 377 * might not support Host AP specific scan request (with SSID 378 * info). */ 379 return wpa_driver_wext_scan(drv->wext, ssid, ssid_len); 380 } 381 382 if (ssid_len > 32) 383 ssid_len = 32; 384 385 os_memset(¶m, 0, sizeof(param)); 386 param.cmd = PRISM2_HOSTAPD_SCAN_REQ; 387 param.u.scan_req.ssid_len = ssid_len; 388 os_memcpy(param.u.scan_req.ssid, ssid, ssid_len); 389 ret = hostapd_ioctl(drv, ¶m, sizeof(param), 1); 390 391 /* Not all drivers generate "scan completed" wireless event, so try to 392 * read results after a timeout. */ 393 eloop_cancel_timeout(wpa_driver_wext_scan_timeout, drv->wext, 394 drv->ctx); 395 eloop_register_timeout(3, 0, wpa_driver_wext_scan_timeout, drv->wext, 396 drv->ctx); 397 398 return ret; 399 } 400 401 402 static int wpa_driver_hostap_set_auth_alg(void *priv, int auth_alg) 403 { 404 struct wpa_driver_hostap_data *drv = priv; 405 int algs = 0; 406 407 if (auth_alg & AUTH_ALG_OPEN_SYSTEM) 408 algs |= 1; 409 if (auth_alg & AUTH_ALG_SHARED_KEY) 410 algs |= 2; 411 if (auth_alg & AUTH_ALG_LEAP) 412 algs |= 4; 413 if (algs == 0) 414 algs = 1; /* at least one algorithm should be set */ 415 416 return prism2param(drv, PRISM2_PARAM_AP_AUTH_ALGS, algs); 417 } 418 419 420 static int wpa_driver_hostap_get_bssid(void *priv, u8 *bssid) 421 { 422 struct wpa_driver_hostap_data *drv = priv; 423 return wpa_driver_wext_get_bssid(drv->wext, bssid); 424 } 425 426 427 static int wpa_driver_hostap_get_ssid(void *priv, u8 *ssid) 428 { 429 struct wpa_driver_hostap_data *drv = priv; 430 return wpa_driver_wext_get_ssid(drv->wext, ssid); 431 } 432 433 434 static struct wpa_scan_results * wpa_driver_hostap_get_scan_results(void *priv) 435 { 436 struct wpa_driver_hostap_data *drv = priv; 437 return wpa_driver_wext_get_scan_results(drv->wext); 438 } 439 440 441 static int wpa_driver_hostap_set_operstate(void *priv, int state) 442 { 443 struct wpa_driver_hostap_data *drv = priv; 444 return wpa_driver_wext_set_operstate(drv->wext, state); 445 } 446 447 448 static void * wpa_driver_hostap_init(void *ctx, const char *ifname) 449 { 450 struct wpa_driver_hostap_data *drv; 451 452 drv = os_zalloc(sizeof(*drv)); 453 if (drv == NULL) 454 return NULL; 455 drv->wext = wpa_driver_wext_init(ctx, ifname); 456 if (drv->wext == NULL) { 457 os_free(drv); 458 return NULL; 459 } 460 461 drv->ctx = ctx; 462 os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname)); 463 drv->sock = socket(PF_INET, SOCK_DGRAM, 0); 464 if (drv->sock < 0) { 465 perror("socket"); 466 wpa_driver_wext_deinit(drv->wext); 467 os_free(drv); 468 return NULL; 469 } 470 471 if (os_strncmp(ifname, "wlan", 4) == 0) { 472 /* 473 * Host AP driver may use both wlan# and wifi# interface in 474 * wireless events. 475 */ 476 char ifname2[IFNAMSIZ + 1]; 477 os_strlcpy(ifname2, ifname, sizeof(ifname2)); 478 os_memcpy(ifname2, "wifi", 4); 479 wpa_driver_wext_alternative_ifindex(drv->wext, ifname2); 480 } 481 482 return drv; 483 } 484 485 486 static void wpa_driver_hostap_deinit(void *priv) 487 { 488 struct wpa_driver_hostap_data *drv = priv; 489 wpa_driver_wext_deinit(drv->wext); 490 close(drv->sock); 491 os_free(drv); 492 } 493 494 495 const struct wpa_driver_ops wpa_driver_hostap_ops = { 496 .name = "hostap", 497 .desc = "Host AP driver (Intersil Prism2/2.5/3)", 498 .get_bssid = wpa_driver_hostap_get_bssid, 499 .get_ssid = wpa_driver_hostap_get_ssid, 500 .set_wpa = wpa_driver_hostap_set_wpa, 501 .set_key = wpa_driver_hostap_set_key, 502 .set_countermeasures = wpa_driver_hostap_set_countermeasures, 503 .set_drop_unencrypted = wpa_driver_hostap_set_drop_unencrypted, 504 .scan = wpa_driver_hostap_scan, 505 .get_scan_results2 = wpa_driver_hostap_get_scan_results, 506 .deauthenticate = wpa_driver_hostap_deauthenticate, 507 .disassociate = wpa_driver_hostap_disassociate, 508 .associate = wpa_driver_hostap_associate, 509 .set_auth_alg = wpa_driver_hostap_set_auth_alg, 510 .init = wpa_driver_hostap_init, 511 .deinit = wpa_driver_hostap_deinit, 512 .set_operstate = wpa_driver_hostap_set_operstate, 513 }; 514
