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         switch (ssid->mode) {
 159         case WPAS_MODE_INFRA:
 160                 params.mode = IEEE80211_MODE_INFRA;
 161                 break;
 162         case WPAS_MODE_IBSS:
 163                 params.mode = IEEE80211_MODE_IBSS;
 164                 break;
 165         case WPAS_MODE_AP:
 166                 params.mode = IEEE80211_MODE_AP;
 167                 break;
 168         }
 169         params.freq = ssid->frequency;
 170
 171         if (wpa_drv_associate(wpa_s, &params) < 0) {
 172                 wpa_msg(wpa_s, MSG_INFO, "Failed to start AP functionality");
 173                 return -1;
 174         }
 175
 176         wpa_s->ap_iface = hapd_iface = os_zalloc(sizeof(*wpa_s->ap_iface));
 177         if (hapd_iface == NULL)
 178                 return -1;
 179         hapd_iface->owner = wpa_s;
 180
 181         wpa_s->ap_iface->conf = conf = hostapd_config_defaults();
 182         if (conf == NULL) {
 183                 wpa_supplicant_ap_deinit(wpa_s);
 184                 return -1;
 185         }
 186
 187         if (wpa_supplicant_conf_ap(wpa_s, ssid, conf)) {
 188                 wpa_printf(MSG_ERROR, "Failed to create AP configuration");
 189                 wpa_supplicant_ap_deinit(wpa_s);
 190                 return -1;
 191         }
 192
 193         hapd_iface->num_bss = conf->num_bss;
 194         hapd_iface->bss = os_zalloc(conf->num_bss *
 195                                     sizeof(struct hostapd_data *));
 196         if (hapd_iface->bss == NULL) {
 197                 wpa_supplicant_ap_deinit(wpa_s);
 198                 return -1;
 199         }
 200
 201         for (i = 0; i < conf->num_bss; i++) {
 202                 hapd_iface->bss[i] =
 203                         hostapd_alloc_bss_data(hapd_iface, conf,
 204                                                &conf->bss[i]);
 205                 if (hapd_iface->bss[i] == NULL) {
 206                         wpa_supplicant_ap_deinit(wpa_s);
 207                         return -1;
 208                 }
 209
 210                 hapd_iface->bss[i]->msg_ctx = wpa_s;
 211         }
 212
 213         os_memcpy(hapd_iface->bss[0]->own_addr, wpa_s->own_addr, ETH_ALEN);
 214         hapd_iface->bss[0]->driver = wpa_s->driver;
 215         hapd_iface->bss[0]->drv_priv = wpa_s->drv_priv;
 216
 217         if (hostapd_setup_interface(wpa_s->ap_iface)) {
 218                 wpa_printf(MSG_ERROR, "Failed to initialize AP interface");
 219                 wpa_supplicant_ap_deinit(wpa_s);
 220                 return -1;
 221         }
 222
 223         wpa_s->current_ssid = ssid;
 224         os_memcpy(wpa_s->bssid, wpa_s->own_addr, ETH_ALEN);
 225         wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 226
 227         return 0;
 228 }
 229
 230
 231 void wpa_supplicant_ap_deinit(struct wpa_supplicant *wpa_s)
 232 {
 233         if (wpa_s->ap_iface == NULL)
 234                 return;
 235
 236         hostapd_interface_deinit(wpa_s->ap_iface);
 237         hostapd_interface_free(wpa_s->ap_iface);
 238         wpa_s->ap_iface = NULL;
 239 }
 240
 241
 242 void ap_tx_status(void *ctx, const u8 *addr,
 243                   const u8 *buf, size_t len, int ack)
 244 {
 245 #ifdef NEED_AP_MLME
 246         struct wpa_supplicant *wpa_s = ctx;
 247         hostapd_tx_status(wpa_s->ap_iface->bss[0], addr, buf, len, ack);
 248 #endif /* NEED_AP_MLME */
 249 }
 250
 251
 252 void ap_rx_from_unknown_sta(void *ctx, const struct ieee80211_hdr *hdr,
 253                             size_t len)
 254 {
 255 #ifdef NEED_AP_MLME
 256         struct wpa_supplicant *wpa_s = ctx;
 257         u16 fc = le_to_host16(hdr->frame_control);
 258         ieee802_11_rx_from_unknown(wpa_s->ap_iface->bss[0], hdr->addr2,
 259                                    (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
 260                                    (WLAN_FC_TODS | WLAN_FC_FROMDS));
 261 #endif /* NEED_AP_MLME */
 262 }
 263
 264
 265 void ap_mgmt_rx(void *ctx, const u8 *buf, size_t len,
 266                 struct hostapd_frame_info *fi)
 267 {
 268 #ifdef NEED_AP_MLME
 269         struct wpa_supplicant *wpa_s = ctx;
 270         ieee802_11_mgmt(wpa_s->ap_iface->bss[0], buf, len, fi);
 271 #endif /* NEED_AP_MLME */
 272 }
 273
 274
 275 void ap_mgmt_tx_cb(void *ctx, const u8 *buf, size_t len, u16 stype, int ok)
 276 {
 277 #ifdef NEED_AP_MLME
 278         struct wpa_supplicant *wpa_s = ctx;
 279         ieee802_11_mgmt_cb(wpa_s->ap_iface->bss[0], buf, len, stype, ok);
 280 #endif /* NEED_AP_MLME */
 281 }
 282
 283
 284 void wpa_supplicant_ap_rx_eapol(struct wpa_supplicant *wpa_s,
 285                                 const u8 *src_addr, const u8 *buf, size_t len)
 286 {
 287         hostapd_eapol_receive(wpa_s->ap_iface->bss[0], src_addr, buf, len);
 288 }
 289
 290
 291 #ifdef CONFIG_WPS
 292
 293 int wpa_supplicant_ap_wps_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
 294 {
 295         return hostapd_wps_button_pushed(wpa_s->ap_iface->bss[0]);
 296 }
 297
 298
 299 int wpa_supplicant_ap_wps_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
 300                               const char *pin, char *buf, size_t buflen)
 301 {
 302         int ret, ret_len = 0;
 303
 304         if (pin == NULL) {
 305                 unsigned int rpin = wps_generate_pin();
 306                 ret_len = os_snprintf(buf, buflen, "%d", rpin);
 307                 pin = buf;
 308         }
 309
 310         ret = hostapd_wps_add_pin(wpa_s->ap_iface->bss[0], "any", pin, 0);
 311         if (ret)
 312                 return -1;
 313         return ret_len;
 314 }
 315
 316 #endif /* CONFIG_WPS */
 317
 318
 319 #ifdef CONFIG_CTRL_IFACE
 320
 321 int ap_ctrl_iface_sta_first(struct wpa_supplicant *wpa_s,
 322                             char *buf, size_t buflen)
 323 {
 324         if (wpa_s->ap_iface == NULL)
 325                 return -1;
 326         return hostapd_ctrl_iface_sta_first(wpa_s->ap_iface->bss[0],
 327                                             buf, buflen);
 328 }
 329
 330
 331 int ap_ctrl_iface_sta(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(wpa_s->ap_iface->bss[0], txtaddr,
 337                                       buf, buflen);
 338 }
 339
 340
 341 int ap_ctrl_iface_sta_next(struct wpa_supplicant *wpa_s, const char *txtaddr,
 342                            char *buf, size_t buflen)
 343 {
 344         if (wpa_s->ap_iface == NULL)
 345                 return -1;
 346         return hostapd_ctrl_iface_sta_next(wpa_s->ap_iface->bss[0], txtaddr,
 347                                            buf, buflen);
 348 }
 349
 350
 351 int ap_ctrl_iface_wpa_get_status(struct wpa_supplicant *wpa_s, char *buf,
 352                                  size_t buflen, int verbose)
 353 {
 354         char *pos = buf, *end = buf + buflen;
 355         int ret;
 356         struct hostapd_bss_config *conf;
 357
 358         if (wpa_s->ap_iface == NULL)
 359                 return -1;
 360
 361         conf = wpa_s->ap_iface->bss[0]->conf;
 362         if (conf->wpa == 0)
 363                 return 0;
 364
 365         ret = os_snprintf(pos, end - pos,
 366                           "pairwise_cipher=%s\n"
 367                           "group_cipher=%s\n"
 368                           "key_mgmt=%s\n",
 369                           wpa_cipher_txt(conf->rsn_pairwise),
 370                           wpa_cipher_txt(conf->wpa_group),
 371                           wpa_key_mgmt_txt(conf->wpa_key_mgmt,
 372                                            conf->wpa));
 373         if (ret < 0 || ret >= end - pos)
 374                 return pos - buf;
 375         pos += ret;
 376         return pos - buf;
 377 }
 378
 379 #endif /* CONFIG_CTRL_IFACE */