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 "includes.h"
  17
  18 #include "common.h"
  19 #include "ap/hostapd.h"
  20 #include "ap/config.h"
  21 #ifdef NEED_AP_MLME
  22 #include "ap/ieee802_11.h"
  23 #endif /* NEED_AP_MLME */
  24 #include "ap/wps_hostapd.h"
  25 #include "ap/ctrl_iface_ap.h"
  26 #include "eap_common/eap_defs.h"
  27 #include "eap_server/eap_methods.h"
  28 #include "eap_common/eap_wsc_common.h"
  29 #include "wps/wps.h"
  30 #include "config_ssid.h"
  31 #include "config.h"
  32 #include "wpa_supplicant_i.h"
  33 #include "driver_i.h"
  34 #include "ap.h"
  35
  36
  37 struct hapd_interfaces {
  38         size_t count;
  39         struct hostapd_iface **iface;
  40 };
  41
  42
  43 int hostapd_for_each_interface(struct hapd_interfaces *interfaces,
  44                                int (*cb)(struct hostapd_iface *iface,
  45                                          void *ctx), void *ctx)
  46 {
  47         /* TODO */
  48         return 0;
  49 }
  50
  51
  52 static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
  53                                   struct wpa_ssid *ssid,
  54                                   struct hostapd_config *conf)
  55 {
  56         struct hostapd_bss_config *bss = &conf->bss[0];
  57         int pairwise;
  58
  59         conf->driver = wpa_s->driver;
  60
  61         os_strlcpy(bss->iface, wpa_s->ifname, sizeof(bss->iface));
  62
  63         if (ssid->frequency == 0) {
  64                 /* default channel 11 */
  65                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
  66                 conf->channel = 11;
  67         } else if (ssid->frequency >= 2412 && ssid->frequency <= 2472) {
  68                 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
  69                 conf->channel = (ssid->frequency - 2407) / 5;
  70         } else if ((ssid->frequency >= 5180 && ssid->frequency <= 5240) ||
  71                    (ssid->frequency >= 5745 && ssid->frequency <= 5825)) {
  72                 conf->hw_mode = HOSTAPD_MODE_IEEE80211A;
  73                 conf->channel = (ssid->frequency - 5000) / 5;
  74         } else {
  75                 wpa_printf(MSG_ERROR, "Unsupported AP mode frequency: %d MHz",
  76                            ssid->frequency);
  77                 return -1;
  78         }
  79
  80         /* TODO: enable HT if driver supports it;
  81          * drop to 11b if driver does not support 11g */
  82
  83         if (ssid->ssid_len == 0) {
  84                 wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
  85                 return -1;
  86         }
  87         os_memcpy(bss->ssid.ssid, ssid->ssid, ssid->ssid_len);
  88         bss->ssid.ssid[ssid->ssid_len] = '\0';
  89         bss->ssid.ssid_len = ssid->ssid_len;
  90         bss->ssid.ssid_set = 1;
  91
  92         if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt))
  93                 bss->wpa = ssid->proto;
  94         bss->wpa_key_mgmt = ssid->key_mgmt;
  95         bss->wpa_pairwise = ssid->pairwise_cipher;
  96         if (ssid->passphrase) {
  97                 bss->ssid.wpa_passphrase = os_strdup(ssid->passphrase);
  98         } else if (ssid->psk_set) {
  99                 os_free(bss->ssid.wpa_psk);
 100                 bss->ssid.wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
 101                 if (bss->ssid.wpa_psk == NULL)
 102                         return -1;
 103                 os_memcpy(bss->ssid.wpa_psk->psk, ssid->psk, PMK_LEN);
 104                 bss->ssid.wpa_psk->group = 1;
 105         }
 106
 107         /* Select group cipher based on the enabled pairwise cipher suites */
 108         pairwise = 0;
 109         if (bss->wpa & 1)
 110                 pairwise |= bss->wpa_pairwise;
 111         if (bss->wpa & 2) {
 112                 if (bss->rsn_pairwise == 0)
 113                         bss->rsn_pairwise = bss->wpa_pairwise;
 114                 pairwise |= bss->rsn_pairwise;
 115         }
 116         if (pairwise & WPA_CIPHER_TKIP)
 117                 bss->wpa_group = WPA_CIPHER_TKIP;
 118         else
 119                 bss->wpa_group = WPA_CIPHER_CCMP;
 120
 121         if (bss->wpa && bss->ieee802_1x)
 122                 bss->ssid.security_policy = SECURITY_WPA;
 123         else if (bss->wpa)
 124                 bss->ssid.security_policy = SECURITY_WPA_PSK;
 125         else if (bss->ieee802_1x) {
 126                 bss->ssid.security_policy = SECURITY_IEEE_802_1X;
 127                 bss->ssid.wep.default_len = bss->default_wep_key_len;
 128         } else if (bss->ssid.wep.keys_set)
 129                 bss->ssid.security_policy = SECURITY_STATIC_WEP;
 130         else
 131                 bss->ssid.security_policy = SECURITY_PLAINTEXT;
 132
 133 #ifdef CONFIG_WPS
 134         /*
 135          * Enable WPS by default, but require user interaction to actually use
 136          * it. Only the internal Registrar is supported.
 137          */
 138         bss->eap_server = 1;
 139         bss->wps_state = 2;
 140         bss->ap_setup_locked = 1;
 141         if (wpa_s->conf->config_methods)
 142                 bss->config_methods = os_strdup(wpa_s->conf->config_methods);
 143         if (wpa_s->conf->device_type)
 144                 bss->device_type = os_strdup(wpa_s->conf->device_type);
 145 #endif /* CONFIG_WPS */
 146
 147         return 0;
 148 }
 149
 150
 151 int wpa_supplicant_create_ap(struct wpa_supplicant *wpa_s,
 152                              struct wpa_ssid *ssid)
 153 {
 154         struct wpa_driver_associate_params params;
 155         struct hostapd_iface *hapd_iface;
 156         struct hostapd_config *conf;
 157         size_t i;
 158
 159         if (ssid->ssid == NULL || ssid->ssid_len == 0) {
 160                 wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
 161                 return -1;
 162         }
 163
 164         wpa_supplicant_ap_deinit(wpa_s);
 165
 166         wpa_printf(MSG_DEBUG, "Setting up AP (SSID='%s')",
 167                    wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 168
 169         os_memset(&params, 0, sizeof(params));
 170         params.ssid = ssid->ssid;
 171         params.ssid_len = ssid->ssid_len;
 172         params.mode = ssid->mode;
 173         params.freq = ssid->frequency;
 174
 175         if (wpa_drv_associate(wpa_s, &params) < 0) {
 176                 wpa_msg(wpa_s, MSG_INFO, "Failed to start AP functionality");
 177                 return -1;
 178         }
 179
 180         wpa_s->ap_iface = hapd_iface = os_zalloc(sizeof(*wpa_s->ap_iface));
 181         if (hapd_iface == NULL)
 182                 return -1;
 183         hapd_iface->owner = wpa_s;
 184
 185         wpa_s->ap_iface->conf = conf = hostapd_config_defaults();
 186         if (conf == NULL) {
 187                 wpa_supplicant_ap_deinit(wpa_s);
 188                 return -1;
 189         }
 190
 191         if (wpa_supplicant_conf_ap(wpa_s, ssid, conf)) {
 192                 wpa_printf(MSG_ERROR, "Failed to create AP configuration");
 193                 wpa_supplicant_ap_deinit(wpa_s);
 194                 return -1;
 195         }
 196
 197         hapd_iface->num_bss = conf->num_bss;
 198         hapd_iface->bss = os_zalloc(conf->num_bss *
 199                                     sizeof(struct hostapd_data *));
 200         if (hapd_iface->bss == NULL) {
 201                 wpa_supplicant_ap_deinit(wpa_s);
 202                 return -1;
 203         }
 204
 205         for (i = 0; i < conf->num_bss; i++) {
 206                 hapd_iface->bss[i] =
 207                         hostapd_alloc_bss_data(hapd_iface, conf,
 208                                                &conf->bss[i]);
 209                 if (hapd_iface->bss[i] == NULL) {
 210                         wpa_supplicant_ap_deinit(wpa_s);
 211                         return -1;
 212                 }
 213
 214                 hapd_iface->bss[i]->msg_ctx = wpa_s;
 215         }
 216
 217         os_memcpy(hapd_iface->bss[0]->own_addr, wpa_s->own_addr, ETH_ALEN);
 218         hapd_iface->bss[0]->driver = wpa_s->driver;
 219         hapd_iface->bss[0]->drv_priv = wpa_s->drv_priv;
 220
 221         if (hostapd_setup_interface(wpa_s->ap_iface)) {
 222                 wpa_printf(MSG_ERROR, "Failed to initialize AP interface");
 223                 wpa_supplicant_ap_deinit(wpa_s);
 224                 return -1;
 225         }
 226
 227         wpa_s->current_ssid = ssid;
 228         os_memcpy(wpa_s->bssid, wpa_s->own_addr, ETH_ALEN);
 229         wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 230
 231         return 0;
 232 }
 233
 234
 235 void wpa_supplicant_ap_deinit(struct wpa_supplicant *wpa_s)
 236 {
 237         if (wpa_s->ap_iface == NULL)
 238                 return;
 239
 240         hostapd_interface_deinit(wpa_s->ap_iface);
 241         wpa_s->ap_iface = NULL;
 242 }
 243
 244
 245 void ap_tx_status(void *ctx, const u8 *addr,
 246                   const u8 *buf, size_t len, int ack)
 247 {
 248 #ifdef NEED_AP_MLME
 249         struct wpa_supplicant *wpa_s = ctx;
 250         hostapd_tx_status(wpa_s->ap_iface->bss[0], addr, buf, len, ack);
 251 #endif /* NEED_AP_MLME */
 252 }
 253
 254
 255 void ap_rx_from_unknown_sta(void *ctx, const struct ieee80211_hdr *hdr,
 256                             size_t len)
 257 {
 258 #ifdef NEED_AP_MLME
 259         struct wpa_supplicant *wpa_s = ctx;
 260         u16 fc = le_to_host16(hdr->frame_control);
 261         ieee802_11_rx_from_unknown(wpa_s->ap_iface->bss[0], hdr->addr2,
 262                                    (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
 263                                    (WLAN_FC_TODS | WLAN_FC_FROMDS));
 264 #endif /* NEED_AP_MLME */
 265 }
 266
 267
 268 void ap_mgmt_rx(void *ctx, const u8 *buf, size_t len,
 269                 struct hostapd_frame_info *fi)
 270 {
 271 #ifdef NEED_AP_MLME
 272         struct wpa_supplicant *wpa_s = ctx;
 273         ieee802_11_mgmt(wpa_s->ap_iface->bss[0], buf, len, fi);
 274 #endif /* NEED_AP_MLME */
 275 }
 276
 277
 278 void ap_mgmt_tx_cb(void *ctx, const u8 *buf, size_t len, u16 stype, int ok)
 279 {
 280 #ifdef NEED_AP_MLME
 281         struct wpa_supplicant *wpa_s = ctx;
 282         ieee802_11_mgmt_cb(wpa_s->ap_iface->bss[0], buf, len, stype, ok);
 283 #endif /* NEED_AP_MLME */
 284 }
 285
 286
 287 void wpa_supplicant_ap_rx_eapol(struct wpa_supplicant *wpa_s,
 288                                 const u8 *src_addr, const u8 *buf, size_t len)
 289 {
 290         hostapd_eapol_receive(wpa_s->ap_iface->bss[0], src_addr, buf, len);
 291 }
 292
 293
 294 #ifdef CONFIG_WPS
 295
 296 int wpa_supplicant_ap_wps_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
 297 {
 298         return hostapd_wps_button_pushed(wpa_s->ap_iface->bss[0]);
 299 }
 300
 301
 302 int wpa_supplicant_ap_wps_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
 303                               const char *pin, char *buf, size_t buflen)
 304 {
 305         int ret, ret_len = 0;
 306
 307         if (pin == NULL) {
 308                 unsigned int rpin = wps_generate_pin();
 309                 ret_len = os_snprintf(buf, buflen, "%d", rpin);
 310                 pin = buf;
 311         }
 312
 313         ret = hostapd_wps_add_pin(wpa_s->ap_iface->bss[0], "any", pin, 0);
 314         if (ret)
 315                 return -1;
 316         return ret_len;
 317 }
 318
 319 #endif /* CONFIG_WPS */
 320
 321
 322 #ifdef CONFIG_CTRL_IFACE
 323
 324 int ap_ctrl_iface_sta_first(struct wpa_supplicant *wpa_s,
 325                             char *buf, size_t buflen)
 326 {
 327         if (wpa_s->ap_iface == NULL)
 328                 return -1;
 329         return hostapd_ctrl_iface_sta_first(wpa_s->ap_iface->bss[0],
 330                                             buf, buflen);
 331 }
 332
 333
 334 int ap_ctrl_iface_sta(struct wpa_supplicant *wpa_s, const char *txtaddr,
 335                       char *buf, size_t buflen)
 336 {
 337         if (wpa_s->ap_iface == NULL)
 338                 return -1;
 339         return hostapd_ctrl_iface_sta(wpa_s->ap_iface->bss[0], txtaddr,
 340                                       buf, buflen);
 341 }
 342
 343
 344 int ap_ctrl_iface_sta_next(struct wpa_supplicant *wpa_s, const char *txtaddr,
 345                            char *buf, size_t buflen)
 346 {
 347         if (wpa_s->ap_iface == NULL)
 348                 return -1;
 349         return hostapd_ctrl_iface_sta_next(wpa_s->ap_iface->bss[0], txtaddr,
 350                                            buf, buflen);
 351 }
 352
 353
 354 int ap_ctrl_iface_wpa_get_status(struct wpa_supplicant *wpa_s, char *buf,
 355                                  size_t buflen, int verbose)
 356 {
 357         char *pos = buf, *end = buf + buflen;
 358         int ret;
 359         struct hostapd_bss_config *conf;
 360
 361         if (wpa_s->ap_iface == NULL)
 362                 return -1;
 363
 364         conf = wpa_s->ap_iface->bss[0]->conf;
 365         if (conf->wpa == 0)
 366                 return 0;
 367
 368         ret = os_snprintf(pos, end - pos,
 369                           "pairwise_cipher=%s\n"
 370                           "group_cipher=%s\n"
 371                           "key_mgmt=%s\n",
 372                           wpa_cipher_txt(conf->rsn_pairwise),
 373                           wpa_cipher_txt(conf->wpa_group),
 374                           wpa_key_mgmt_txt(conf->wpa_key_mgmt,
 375                                            conf->wpa));
 376         if (ret < 0 || ret >= end - pos)
 377                 return pos - buf;
 378         pos += ret;
 379         return pos - buf;
 380 }
 381
 382 #endif /* CONFIG_CTRL_IFACE */