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/ieee802_1x.h"
  26 #include "ap/wps_hostapd.h"
  27 #include "ap/ctrl_iface_ap.h"
  28 #include "eap_common/eap_defs.h"
  29 #include "eap_server/eap_methods.h"
  30 #include "eap_common/eap_wsc_common.h"
  31 #include "wps/wps.h"
  32 #include "config_ssid.h"
  33 #include "config.h"
  34 #include "wpa_supplicant_i.h"
  35 #include "driver_i.h"
  36 #include "ap.h"
  37
  38
  39 static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
  40                                   struct wpa_ssid *ssid,
  41                                   struct hostapd_config *conf)
  42 {
  43         struct hostapd_bss_config *bss = &conf->bss[0];
  44         int pairwise;
  45
  46         conf->driver = wpa_s->driver;
  47
  48         os_strlcpy(bss->iface, wpa_s->ifname, sizeof(bss->iface));
  49
  50         if (ssid->frequency == 0) {
  51                 /* default channel 11 */
  52                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
  53                 conf->channel = 11;
  54         } else if (ssid->frequency >= 2412 && ssid->frequency <= 2472) {
  55                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
  56                 conf->channel = (ssid->frequency - 2407) / 5;
  57         } else if ((ssid->frequency >= 5180 && ssid->frequency <= 5240) ||
  58                    (ssid->frequency >= 5745 && ssid->frequency <= 5825)) {
  59                 conf->hw_mode = HOSTAPD_MODE_IEEE80211A;
  60                 conf->channel = (ssid->frequency - 5000) / 5;
  61         } else {
  62                 wpa_printf(MSG_ERROR, "Unsupported AP mode frequency: %d MHz",
  63                            ssid->frequency);
  64                 return -1;
  65         }
  66
  67         /* TODO: enable HT if driver supports it;
  68          * drop to 11b if driver does not support 11g */
  69
  70         if (ssid->ssid_len == 0) {
  71                 wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
  72                 return -1;
  73         }
  74         os_memcpy(bss->ssid.ssid, ssid->ssid, ssid->ssid_len);
  75         bss->ssid.ssid[ssid->ssid_len] = '\0';
  76         bss->ssid.ssid_len = ssid->ssid_len;
  77         bss->ssid.ssid_set = 1;
  78
  79         if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt))
  80                 bss->wpa = ssid->proto;
  81         bss->wpa_key_mgmt = ssid->key_mgmt;
  82         bss->wpa_pairwise = ssid->pairwise_cipher;
  83         if (ssid->passphrase) {
  84                 bss->ssid.wpa_passphrase = os_strdup(ssid->passphrase);
  85         } else if (ssid->psk_set) {
  86                 os_free(bss->ssid.wpa_psk);
  87                 bss->ssid.wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
  88                 if (bss->ssid.wpa_psk == NULL)
  89                         return -1;
  90                 os_memcpy(bss->ssid.wpa_psk->psk, ssid->psk, PMK_LEN);
  91                 bss->ssid.wpa_psk->group = 1;
  92         }
  93
  94         /* Select group cipher based on the enabled pairwise cipher suites */
  95         pairwise = 0;
  96         if (bss->wpa & 1)
  97                 pairwise |= bss->wpa_pairwise;
  98         if (bss->wpa & 2) {
  99                 if (bss->rsn_pairwise == 0)
 100                         bss->rsn_pairwise = bss->wpa_pairwise;
 101                 pairwise |= bss->rsn_pairwise;
 102         }
 103         if (pairwise & WPA_CIPHER_TKIP)
 104                 bss->wpa_group = WPA_CIPHER_TKIP;
 105         else
 106                 bss->wpa_group = WPA_CIPHER_CCMP;
 107
 108         if (bss->wpa && bss->ieee802_1x)
 109                 bss->ssid.security_policy = SECURITY_WPA;
 110         else if (bss->wpa)
 111                 bss->ssid.security_policy = SECURITY_WPA_PSK;
 112         else if (bss->ieee802_1x) {
 113                 bss->ssid.security_policy = SECURITY_IEEE_802_1X;
 114                 bss->ssid.wep.default_len = bss->default_wep_key_len;
 115         } else if (bss->ssid.wep.keys_set)
 116                 bss->ssid.security_policy = SECURITY_STATIC_WEP;
 117         else
 118                 bss->ssid.security_policy = SECURITY_PLAINTEXT;
 119
 120 #ifdef CONFIG_WPS
 121         /*
 122          * Enable WPS by default, but require user interaction to actually use
 123          * it. Only the internal Registrar is supported.
 124          */
 125         bss->eap_server = 1;
 126         bss->wps_state = 2;
 127         bss->ap_setup_locked = 1;
 128         if (wpa_s->conf->config_methods)
 129                 bss->config_methods = os_strdup(wpa_s->conf->config_methods);
 130         if (wpa_s->conf->device_type)
 131                 bss->device_type = os_strdup(wpa_s->conf->device_type);
 132 #endif /* CONFIG_WPS */
 133
 134         return 0;
 135 }
 136
 137
 138 int wpa_supplicant_create_ap(struct wpa_supplicant *wpa_s,
 139                              struct wpa_ssid *ssid)
 140 {
 141         struct wpa_driver_associate_params params;
 142         struct hostapd_iface *hapd_iface;
 143         struct hostapd_config *conf;
 144         size_t i;
 145
 146         if (ssid->ssid == NULL || ssid->ssid_len == 0) {
 147                 wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
 148                 return -1;
 149         }
 150
 151         wpa_supplicant_ap_deinit(wpa_s);
 152
 153         wpa_printf(MSG_DEBUG, "Setting up AP (SSID='%s')",
 154                    wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 155
 156         os_memset(&params, 0, sizeof(params));
 157         params.ssid = ssid->ssid;
 158         params.ssid_len = ssid->ssid_len;
 159         switch (ssid->mode) {
 160         case WPAS_MODE_INFRA:
 161                 params.mode = IEEE80211_MODE_INFRA;
 162                 break;
 163         case WPAS_MODE_IBSS:
 164                 params.mode = IEEE80211_MODE_IBSS;
 165                 break;
 166         case WPAS_MODE_AP:
 167                 params.mode = IEEE80211_MODE_AP;
 168                 break;
 169         }
 170         params.freq = ssid->frequency;
 171
 172         if (wpa_drv_associate(wpa_s, &params) < 0) {
 173                 wpa_msg(wpa_s, MSG_INFO, "Failed to start AP functionality");
 174                 return -1;
 175         }
 176
 177         wpa_s->ap_iface = hapd_iface = os_zalloc(sizeof(*wpa_s->ap_iface));
 178         if (hapd_iface == NULL)
 179                 return -1;
 180         hapd_iface->owner = wpa_s;
 181
 182         wpa_s->ap_iface->conf = conf = hostapd_config_defaults();
 183         if (conf == NULL) {
 184                 wpa_supplicant_ap_deinit(wpa_s);
 185                 return -1;
 186         }
 187
 188         if (wpa_supplicant_conf_ap(wpa_s, ssid, conf)) {
 189                 wpa_printf(MSG_ERROR, "Failed to create AP configuration");
 190                 wpa_supplicant_ap_deinit(wpa_s);
 191                 return -1;
 192         }
 193
 194         hapd_iface->num_bss = conf->num_bss;
 195         hapd_iface->bss = os_zalloc(conf->num_bss *
 196                                     sizeof(struct hostapd_data *));
 197         if (hapd_iface->bss == NULL) {
 198                 wpa_supplicant_ap_deinit(wpa_s);
 199                 return -1;
 200         }
 201
 202         for (i = 0; i < conf->num_bss; i++) {
 203                 hapd_iface->bss[i] =
 204                         hostapd_alloc_bss_data(hapd_iface, conf,
 205                                                &conf->bss[i]);
 206                 if (hapd_iface->bss[i] == NULL) {
 207                         wpa_supplicant_ap_deinit(wpa_s);
 208                         return -1;
 209                 }
 210
 211                 hapd_iface->bss[i]->msg_ctx = wpa_s;
 212         }
 213
 214         os_memcpy(hapd_iface->bss[0]->own_addr, wpa_s->own_addr, ETH_ALEN);
 215         hapd_iface->bss[0]->driver = wpa_s->driver;
 216         hapd_iface->bss[0]->drv_priv = wpa_s->drv_priv;
 217
 218         if (hostapd_setup_interface(wpa_s->ap_iface)) {
 219                 wpa_printf(MSG_ERROR, "Failed to initialize AP interface");
 220                 wpa_supplicant_ap_deinit(wpa_s);
 221                 return -1;
 222         }
 223
 224         wpa_s->current_ssid = ssid;
 225         os_memcpy(wpa_s->bssid, wpa_s->own_addr, ETH_ALEN);
 226         wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 227
 228         return 0;
 229 }
 230
 231
 232 void wpa_supplicant_ap_deinit(struct wpa_supplicant *wpa_s)
 233 {
 234         if (wpa_s->ap_iface == NULL)
 235                 return;
 236
 237         hostapd_interface_deinit(wpa_s->ap_iface);
 238         hostapd_interface_free(wpa_s->ap_iface);
 239         wpa_s->ap_iface = NULL;
 240 }
 241
 242
 243 void ap_tx_status(void *ctx, const u8 *addr,
 244                   const u8 *buf, size_t len, int ack)
 245 {
 246 #ifdef NEED_AP_MLME
 247         struct wpa_supplicant *wpa_s = ctx;
 248         hostapd_tx_status(wpa_s->ap_iface->bss[0], addr, buf, len, ack);
 249 #endif /* NEED_AP_MLME */
 250 }
 251
 252
 253 void ap_rx_from_unknown_sta(void *ctx, const u8 *frame, size_t len)
 254 {
 255 #ifdef NEED_AP_MLME
 256         struct wpa_supplicant *wpa_s = ctx;
 257         const struct ieee80211_hdr *hdr =
 258                 (const struct ieee80211_hdr *) frame;
 259         u16 fc = le_to_host16(hdr->frame_control);
 260         ieee802_11_rx_from_unknown(wpa_s->ap_iface->bss[0], hdr->addr2,
 261                                    (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
 262                                    (WLAN_FC_TODS | WLAN_FC_FROMDS));
 263 #endif /* NEED_AP_MLME */
 264 }
 265
 266
 267 void ap_mgmt_rx(void *ctx, struct rx_mgmt *rx_mgmt)
 268 {
 269 #ifdef NEED_AP_MLME
 270         struct wpa_supplicant *wpa_s = ctx;
 271         struct hostapd_frame_info fi;
 272         os_memset(&fi, 0, sizeof(fi));
 273         fi.datarate = rx_mgmt->datarate;
 274         fi.ssi_signal = rx_mgmt->ssi_signal;
 275         ieee802_11_mgmt(wpa_s->ap_iface->bss[0], rx_mgmt->frame,
 276                         rx_mgmt->frame_len, &fi);
 277 #endif /* NEED_AP_MLME */
 278 }
 279
 280
 281 void ap_mgmt_tx_cb(void *ctx, const u8 *buf, size_t len, u16 stype, int ok)
 282 {
 283 #ifdef NEED_AP_MLME
 284         struct wpa_supplicant *wpa_s = ctx;
 285         ieee802_11_mgmt_cb(wpa_s->ap_iface->bss[0], buf, len, stype, ok);
 286 #endif /* NEED_AP_MLME */
 287 }
 288
 289
 290 void wpa_supplicant_ap_rx_eapol(struct wpa_supplicant *wpa_s,
 291                                 const u8 *src_addr, const u8 *buf, size_t len)
 292 {
 293         ieee802_1x_receive(wpa_s->ap_iface->bss[0], src_addr, buf, len);
 294 }
 295
 296
 297 #ifdef CONFIG_WPS
 298
 299 int wpa_supplicant_ap_wps_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
 300 {
 301         return hostapd_wps_button_pushed(wpa_s->ap_iface->bss[0]);
 302 }
 303
 304
 305 int wpa_supplicant_ap_wps_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
 306                               const char *pin, char *buf, size_t buflen)
 307 {
 308         int ret, ret_len = 0;
 309
 310         if (pin == NULL) {
 311                 unsigned int rpin = wps_generate_pin();
 312                 ret_len = os_snprintf(buf, buflen, "%d", rpin);
 313                 pin = buf;
 314         }
 315
 316         ret = hostapd_wps_add_pin(wpa_s->ap_iface->bss[0], "any", pin, 0);
 317         if (ret)
 318                 return -1;
 319         return ret_len;
 320 }
 321
 322 #endif /* CONFIG_WPS */
 323
 324
 325 #ifdef CONFIG_CTRL_IFACE
 326
 327 int ap_ctrl_iface_sta_first(struct wpa_supplicant *wpa_s,
 328                             char *buf, size_t buflen)
 329 {
 330         if (wpa_s->ap_iface == NULL)
 331                 return -1;
 332         return hostapd_ctrl_iface_sta_first(wpa_s->ap_iface->bss[0],
 333                                             buf, buflen);
 334 }
 335
 336
 337 int ap_ctrl_iface_sta(struct wpa_supplicant *wpa_s, const char *txtaddr,
 338                       char *buf, size_t buflen)
 339 {
 340         if (wpa_s->ap_iface == NULL)
 341                 return -1;
 342         return hostapd_ctrl_iface_sta(wpa_s->ap_iface->bss[0], txtaddr,
 343                                       buf, buflen);
 344 }
 345
 346
 347 int ap_ctrl_iface_sta_next(struct wpa_supplicant *wpa_s, const char *txtaddr,
 348                            char *buf, size_t buflen)
 349 {
 350         if (wpa_s->ap_iface == NULL)
 351                 return -1;
 352         return hostapd_ctrl_iface_sta_next(wpa_s->ap_iface->bss[0], txtaddr,
 353                                            buf, buflen);
 354 }
 355
 356
 357 int ap_ctrl_iface_wpa_get_status(struct wpa_supplicant *wpa_s, char *buf,
 358                                  size_t buflen, int verbose)
 359 {
 360         char *pos = buf, *end = buf + buflen;
 361         int ret;
 362         struct hostapd_bss_config *conf;
 363
 364         if (wpa_s->ap_iface == NULL)
 365                 return -1;
 366
 367         conf = wpa_s->ap_iface->bss[0]->conf;
 368         if (conf->wpa == 0)
 369                 return 0;
 370
 371         ret = os_snprintf(pos, end - pos,
 372                           "pairwise_cipher=%s\n"
 373                           "group_cipher=%s\n"
 374                           "key_mgmt=%s\n",
 375                           wpa_cipher_txt(conf->rsn_pairwise),
 376                           wpa_cipher_txt(conf->wpa_group),
 377                           wpa_key_mgmt_txt(conf->wpa_key_mgmt,
 378                                            conf->wpa));
 379         if (ret < 0 || ret >= end - pos)
 380                 return pos - buf;
 381         pos += ret;
 382         return pos - buf;
 383 }
 384
 385 #endif /* CONFIG_CTRL_IFACE */