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