dist/wpa/src/drivers/driver_hostap.c

   1 /*
   2  * WPA Supplicant - driver interaction with Linux Host AP driver
   3  * Copyright (c) 2003-2005, Jouni Malinen <j@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(&param, 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, &param, 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(&param, 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, &param, 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 };