wpa_supplicant/ap.c

   1 /*
   2  * WPA Supplicant - Basic AP mode support routines
   3  * Copyright (c) 2003-2009, Jouni Malinen <j@w1.fi>
   4  * Copyright (c) 2009, Atheros Communications
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Alternatively, this software may be distributed under the terms of BSD
  11  * license.
  12  *
  13  * See README and COPYING for more details.
  14  */
  15
  16 #include "utils/includes.h"
  17
  18 #include "utils/common.h"
  19 #include "common/ieee802_11_defs.h"
  20 #include "ap/hostapd.h"
  21 #include "ap/ap_config.h"
  22 #ifdef NEED_AP_MLME
  23 #include "ap/ieee802_11.h"
  24 #endif /* NEED_AP_MLME */
  25 #include "ap/wps_hostapd.h"
  26 #include "ap/ctrl_iface_ap.h"
  27 #include "eap_common/eap_defs.h"
  28 #include "eap_server/eap_methods.h"
  29 #include "eap_common/eap_wsc_common.h"
  30 #include "wps/wps.h"
  31 #include "config_ssid.h"
  32 #include "config.h"
  33 #include "wpa_supplicant_i.h"
  34 #include "driver_i.h"
  35 #include "ap.h"
  36
  37
  38 static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
  39                                   struct wpa_ssid *ssid,
  40                                   struct hostapd_config *conf)
  41 {
  42         struct hostapd_bss_config *bss = &conf->bss[0];
  43         int pairwise;
  44
  45         conf->driver = wpa_s->driver;
  46
  47         os_strlcpy(bss->iface, wpa_s->ifname, sizeof(bss->iface));
  48
  49         if (ssid->frequency == 0) {
  50                 /* default channel 11 */
  51                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
  52                 conf->channel = 11;
  53         } else if (ssid->frequency >= 2412 && ssid->frequency <= 2472) {
  54                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
  55                 conf->channel = (ssid->frequency - 2407) / 5;
  56         } else if ((ssid->frequency >= 5180 && ssid->frequency <= 5240) ||
  57                    (ssid->frequency >= 5745 && ssid->frequency <= 5825)) {
  58                 conf->hw_mode = HOSTAPD_MODE_IEEE80211A;
  59                 conf->channel = (ssid->frequency - 5000) / 5;
  60         } else {
  61                 wpa_printf(MSG_ERROR, "Unsupported AP mode frequency: %d MHz",
  62                            ssid->frequency);
  63                 return -1;
  64         }
  65
  66         /* TODO: enable HT if driver supports it;
  67          * drop to 11b if driver does not support 11g */
  68
  69         if (ssid->ssid_len == 0) {
  70                 wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
  71                 return -1;
  72         }
  73         os_memcpy(bss->ssid.ssid, ssid->ssid, ssid->ssid_len);
  74         bss->ssid.ssid[ssid->ssid_len] = '\0';
  75         bss->ssid.ssid_len = ssid->ssid_len;
  76         bss->ssid.ssid_set = 1;
  77
  78         if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt))
  79                 bss->wpa = ssid->proto;
  80         bss->wpa_key_mgmt = ssid->key_mgmt;
  81         bss->wpa_pairwise = ssid->pairwise_cipher;
  82         if (ssid->passphrase) {
  83                 bss->ssid.wpa_passphrase = os_strdup(ssid->passphrase);
  84         } else if (ssid->psk_set) {
  85                 os_free(bss->ssid.wpa_psk);
  86                 bss->ssid.wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
  87                 if (bss->ssid.wpa_psk == NULL)
  88                         return -1;
  89                 os_memcpy(bss->ssid.wpa_psk->psk, ssid->psk, PMK_LEN);
  90                 bss->ssid.wpa_psk->group = 1;
  91         }
  92
  93         /* Select group cipher based on the enabled pairwise cipher suites */
  94         pairwise = 0;
  95         if (bss->wpa & 1)
  96                 pairwise |= bss->wpa_pairwise;
  97         if (bss->wpa & 2) {
  98                 if (bss->rsn_pairwise == 0)
  99                         bss->rsn_pairwise = bss->wpa_pairwise;
 100                 pairwise |= bss->rsn_pairwise;
 101         }
 102         if (pairwise & WPA_CIPHER_TKIP)
 103                 bss->wpa_group = WPA_CIPHER_TKIP;
 104         else
 105                 bss->wpa_group = WPA_CIPHER_CCMP;
 106
 107         if (bss->wpa && bss->ieee802_1x)
 108                 bss->ssid.security_policy = SECURITY_WPA;
 109         else if (bss->wpa)
 110                 bss->ssid.security_policy = SECURITY_WPA_PSK;
 111         else if (bss->ieee802_1x) {
 112                 bss->ssid.security_policy = SECURITY_IEEE_802_1X;
 113                 bss->ssid.wep.default_len = bss->default_wep_key_len;
 114         } else if (bss->ssid.wep.keys_set)
 115                 bss->ssid.security_policy = SECURITY_STATIC_WEP;
 116         else
 117                 bss->ssid.security_policy = SECURITY_PLAINTEXT;
 118
 119 #ifdef CONFIG_WPS
 120         /*
 121          * Enable WPS by default, but require user interaction to actually use
 122          * it. Only the internal Registrar is supported.
 123          */
 124         bss->eap_server = 1;
 125         bss->wps_state = 2;
 126         bss->ap_setup_locked = 1;
 127         if (wpa_s->conf->config_methods)
 128                 bss->config_methods = os_strdup(wpa_s->conf->config_methods);
 129         if (wpa_s->conf->device_type)
 130                 bss->device_type = os_strdup(wpa_s->conf->device_type);
 131 #endif /* CONFIG_WPS */
 132
 133         return 0;
 134 }
 135
 136
 137 int wpa_supplicant_create_ap(struct wpa_supplicant *wpa_s,
 138                              struct wpa_ssid *ssid)
 139 {
 140         struct wpa_driver_associate_params params;
 141         struct hostapd_iface *hapd_iface;
 142         struct hostapd_config *conf;
 143         size_t i;
 144
 145         if (ssid->ssid == NULL || ssid->ssid_len == 0) {
 146                 wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
 147                 return -1;
 148         }
 149
 150         wpa_supplicant_ap_deinit(wpa_s);
 151
 152         wpa_printf(MSG_DEBUG, "Setting up AP (SSID='%s')",
 153                    wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 154
 155         os_memset(&params, 0, sizeof(params));
 156         params.ssid = ssid->ssid;
 157         params.ssid_len = ssid->ssid_len;
 158         params.mode = ssid->mode;
 159         params.freq = ssid->frequency;
 160
 161         if (wpa_drv_associate(wpa_s, &params) < 0) {
 162                 wpa_msg(wpa_s, MSG_INFO, "Failed to start AP functionality");
 163                 return -1;
 164         }
 165
 166         wpa_s->ap_iface = hapd_iface = os_zalloc(sizeof(*wpa_s->ap_iface));
 167         if (hapd_iface == NULL)
 168                 return -1;
 169         hapd_iface->owner = wpa_s;
 170
 171         wpa_s->ap_iface->conf = conf = hostapd_config_defaults();
 172         if (conf == NULL) {
 173                 wpa_supplicant_ap_deinit(wpa_s);
 174                 return -1;
 175         }
 176
 177         if (wpa_supplicant_conf_ap(wpa_s, ssid, conf)) {
 178                 wpa_printf(MSG_ERROR, "Failed to create AP configuration");
 179                 wpa_supplicant_ap_deinit(wpa_s);
 180                 return -1;
 181         }
 182
 183         hapd_iface->num_bss = conf->num_bss;
 184         hapd_iface->bss = os_zalloc(conf->num_bss *
 185                                     sizeof(struct hostapd_data *));
 186         if (hapd_iface->bss == NULL) {
 187                 wpa_supplicant_ap_deinit(wpa_s);
 188                 return -1;
 189         }
 190
 191         for (i = 0; i < conf->num_bss; i++) {
 192                 hapd_iface->bss[i] =
 193                         hostapd_alloc_bss_data(hapd_iface, conf,
 194                                                &conf->bss[i]);
 195                 if (hapd_iface->bss[i] == NULL) {
 196                         wpa_supplicant_ap_deinit(wpa_s);
 197                         return -1;
 198                 }
 199
 200                 hapd_iface->bss[i]->msg_ctx = wpa_s;
 201         }
 202
 203         os_memcpy(hapd_iface->bss[0]->own_addr, wpa_s->own_addr, ETH_ALEN);
 204         hapd_iface->bss[0]->driver = wpa_s->driver;
 205         hapd_iface->bss[0]->drv_priv = wpa_s->drv_priv;
 206
 207         if (hostapd_setup_interface(wpa_s->ap_iface)) {
 208                 wpa_printf(MSG_ERROR, "Failed to initialize AP interface");
 209                 wpa_supplicant_ap_deinit(wpa_s);
 210                 return -1;
 211         }
 212
 213         wpa_s->current_ssid = ssid;
 214         os_memcpy(wpa_s->bssid, wpa_s->own_addr, ETH_ALEN);
 215         wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 216
 217         return 0;
 218 }
 219
 220
 221 void wpa_supplicant_ap_deinit(struct wpa_supplicant *wpa_s)
 222 {
 223         if (wpa_s->ap_iface == NULL)
 224                 return;
 225
 226         hostapd_interface_deinit(wpa_s->ap_iface);
 227         hostapd_interface_free(wpa_s->ap_iface);
 228         wpa_s->ap_iface = NULL;
 229 }
 230
 231
 232 void ap_tx_status(void *ctx, const u8 *addr,
 233                   const u8 *buf, size_t len, int ack)
 234 {
 235 #ifdef NEED_AP_MLME
 236         struct wpa_supplicant *wpa_s = ctx;
 237         hostapd_tx_status(wpa_s->ap_iface->bss[0], addr, buf, len, ack);
 238 #endif /* NEED_AP_MLME */
 239 }
 240
 241
 242 void ap_rx_from_unknown_sta(void *ctx, const struct ieee80211_hdr *hdr,
 243                             size_t len)
 244 {
 245 #ifdef NEED_AP_MLME
 246         struct wpa_supplicant *wpa_s = ctx;
 247         u16 fc = le_to_host16(hdr->frame_control);
 248         ieee802_11_rx_from_unknown(wpa_s->ap_iface->bss[0], hdr->addr2,
 249                                    (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
 250                                    (WLAN_FC_TODS | WLAN_FC_FROMDS));
 251 #endif /* NEED_AP_MLME */
 252 }
 253
 254
 255 void ap_mgmt_rx(void *ctx, const u8 *buf, size_t len,
 256                 struct hostapd_frame_info *fi)
 257 {
 258 #ifdef NEED_AP_MLME
 259         struct wpa_supplicant *wpa_s = ctx;
 260         ieee802_11_mgmt(wpa_s->ap_iface->bss[0], buf, len, fi);
 261 #endif /* NEED_AP_MLME */
 262 }
 263
 264
 265 void ap_mgmt_tx_cb(void *ctx, const u8 *buf, size_t len, u16 stype, int ok)
 266 {
 267 #ifdef NEED_AP_MLME
 268         struct wpa_supplicant *wpa_s = ctx;
 269         ieee802_11_mgmt_cb(wpa_s->ap_iface->bss[0], buf, len, stype, ok);
 270 #endif /* NEED_AP_MLME */
 271 }
 272
 273
 274 void wpa_supplicant_ap_rx_eapol(struct wpa_supplicant *wpa_s,
 275                                 const u8 *src_addr, const u8 *buf, size_t len)
 276 {
 277         hostapd_eapol_receive(wpa_s->ap_iface->bss[0], src_addr, buf, len);
 278 }
 279
 280
 281 #ifdef CONFIG_WPS
 282
 283 int wpa_supplicant_ap_wps_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
 284 {
 285         return hostapd_wps_button_pushed(wpa_s->ap_iface->bss[0]);
 286 }
 287
 288
 289 int wpa_supplicant_ap_wps_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
 290                               const char *pin, char *buf, size_t buflen)
 291 {
 292         int ret, ret_len = 0;
 293
 294         if (pin == NULL) {
 295                 unsigned int rpin = wps_generate_pin();
 296                 ret_len = os_snprintf(buf, buflen, "%d", rpin);
 297                 pin = buf;
 298         }
 299
 300         ret = hostapd_wps_add_pin(wpa_s->ap_iface->bss[0], "any", pin, 0);
 301         if (ret)
 302                 return -1;
 303         return ret_len;
 304 }
 305
 306 #endif /* CONFIG_WPS */
 307
 308
 309 #ifdef CONFIG_CTRL_IFACE
 310
 311 int ap_ctrl_iface_sta_first(struct wpa_supplicant *wpa_s,
 312                             char *buf, size_t buflen)
 313 {
 314         if (wpa_s->ap_iface == NULL)
 315                 return -1;
 316         return hostapd_ctrl_iface_sta_first(wpa_s->ap_iface->bss[0],
 317                                             buf, buflen);
 318 }
 319
 320
 321 int ap_ctrl_iface_sta(struct wpa_supplicant *wpa_s, const char *txtaddr,
 322                       char *buf, size_t buflen)
 323 {
 324         if (wpa_s->ap_iface == NULL)
 325                 return -1;
 326         return hostapd_ctrl_iface_sta(wpa_s->ap_iface->bss[0], txtaddr,
 327                                       buf, buflen);
 328 }
 329
 330
 331 int ap_ctrl_iface_sta_next(struct wpa_supplicant *wpa_s, const char *txtaddr,
 332                            char *buf, size_t buflen)
 333 {
 334         if (wpa_s->ap_iface == NULL)
 335                 return -1;
 336         return hostapd_ctrl_iface_sta_next(wpa_s->ap_iface->bss[0], txtaddr,
 337                                            buf, buflen);
 338 }
 339
 340
 341 int ap_ctrl_iface_wpa_get_status(struct wpa_supplicant *wpa_s, char *buf,
 342                                  size_t buflen, int verbose)
 343 {
 344         char *pos = buf, *end = buf + buflen;
 345         int ret;
 346         struct hostapd_bss_config *conf;
 347
 348         if (wpa_s->ap_iface == NULL)
 349                 return -1;
 350
 351         conf = wpa_s->ap_iface->bss[0]->conf;
 352         if (conf->wpa == 0)
 353                 return 0;
 354
 355         ret = os_snprintf(pos, end - pos,
 356                           "pairwise_cipher=%s\n"
 357                           "group_cipher=%s\n"
 358                           "key_mgmt=%s\n",
 359                           wpa_cipher_txt(conf->rsn_pairwise),
 360                           wpa_cipher_txt(conf->wpa_group),
 361                           wpa_key_mgmt_txt(conf->wpa_key_mgmt,
 362                                            conf->wpa));
 363         if (ret < 0 || ret >= end - pos)
 364                 return pos - buf;
 365         pos += ret;
 366         return pos - buf;
 367 }
 368
 369 #endif /* CONFIG_CTRL_IFACE */