src/ap/beacon.c

   1 /*
   2  * hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response
   3  * Copyright (c) 2002-2004, Instant802 Networks, Inc.
   4  * Copyright (c) 2005-2006, Devicescape Software, Inc.
   5  * Copyright (c) 2008-2012, Jouni Malinen <j@w1.fi>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Alternatively, this software may be distributed under the terms of BSD
  12  * license.
  13  *
  14  * See README and COPYING for more details.
  15  */
  16
  17 #include "utils/includes.h"
  18
  19 #ifndef CONFIG_NATIVE_WINDOWS
  20
  21 #include "utils/common.h"
  22 #include "common/ieee802_11_defs.h"
  23 #include "common/ieee802_11_common.h"
  24 #include "drivers/driver.h"
  25 #include "wps/wps_defs.h"
  26 #include "p2p/p2p.h"
  27 #include "hostapd.h"
  28 #include "ieee802_11.h"
  29 #include "wpa_auth.h"
  30 #include "wmm.h"
  31 #include "ap_config.h"
  32 #include "sta_info.h"
  33 #include "p2p_hostapd.h"
  34 #include "ap_drv_ops.h"
  35 #include "beacon.h"
  36 #include "hs20.h"
  37
  38
  39 #ifdef NEED_AP_MLME
  40
  41 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
  42 {
  43 #ifdef CONFIG_TESTING_OPTIONS
  44         if (hapd->conf->bss_load_test_set) {
  45                 if (2 + 5 > len)
  46                         return eid;
  47                 *eid++ = WLAN_EID_BSS_LOAD;
  48                 *eid++ = 5;
  49                 os_memcpy(eid, hapd->conf->bss_load_test, 5);
  50                 eid += 5;
  51         }
  52 #endif /* CONFIG_TESTING_OPTIONS */
  53         return eid;
  54 }
  55
  56
  57 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
  58 {
  59         u8 erp = 0;
  60
  61         if (hapd->iface->current_mode == NULL ||
  62             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  63                 return 0;
  64
  65         if (hapd->iface->olbc)
  66                 erp |= ERP_INFO_USE_PROTECTION;
  67         if (hapd->iface->num_sta_non_erp > 0) {
  68                 erp |= ERP_INFO_NON_ERP_PRESENT |
  69                         ERP_INFO_USE_PROTECTION;
  70         }
  71         if (hapd->iface->num_sta_no_short_preamble > 0 ||
  72             hapd->iconf->preamble == LONG_PREAMBLE)
  73                 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
  74
  75         return erp;
  76 }
  77
  78
  79 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
  80 {
  81         *eid++ = WLAN_EID_DS_PARAMS;
  82         *eid++ = 1;
  83         *eid++ = hapd->iconf->channel;
  84         return eid;
  85 }
  86
  87
  88 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
  89 {
  90         if (hapd->iface->current_mode == NULL ||
  91             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  92                 return eid;
  93
  94         /* Set NonERP_present and use_protection bits if there
  95          * are any associated NonERP stations. */
  96         /* TODO: use_protection bit can be set to zero even if
  97          * there are NonERP stations present. This optimization
  98          * might be useful if NonERP stations are "quiet".
  99          * See 802.11g/D6 E-1 for recommended practice.
 100          * In addition, Non ERP present might be set, if AP detects Non ERP
 101          * operation on other APs. */
 102
 103         /* Add ERP Information element */
 104         *eid++ = WLAN_EID_ERP_INFO;
 105         *eid++ = 1;
 106         *eid++ = ieee802_11_erp_info(hapd);
 107
 108         return eid;
 109 }
 110
 111
 112 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
 113                                     struct hostapd_channel_data *start,
 114                                     struct hostapd_channel_data *prev)
 115 {
 116         if (end - pos < 3)
 117                 return pos;
 118
 119         /* first channel number */
 120         *pos++ = start->chan;
 121         /* number of channels */
 122         *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
 123         /* maximum transmit power level */
 124         *pos++ = start->max_tx_power;
 125
 126         return pos;
 127 }
 128
 129
 130 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
 131                                 int max_len)
 132 {
 133         u8 *pos = eid;
 134         u8 *end = eid + max_len;
 135         int i;
 136         struct hostapd_hw_modes *mode;
 137         struct hostapd_channel_data *start, *prev;
 138         int chan_spacing = 1;
 139
 140         if (!hapd->iconf->ieee80211d || max_len < 6 ||
 141             hapd->iface->current_mode == NULL)
 142                 return eid;
 143
 144         *pos++ = WLAN_EID_COUNTRY;
 145         pos++; /* length will be set later */
 146         os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
 147         pos += 3;
 148
 149         mode = hapd->iface->current_mode;
 150         if (mode->mode == HOSTAPD_MODE_IEEE80211A)
 151                 chan_spacing = 4;
 152
 153         start = prev = NULL;
 154         for (i = 0; i < mode->num_channels; i++) {
 155                 struct hostapd_channel_data *chan = &mode->channels[i];
 156                 if (chan->flag & HOSTAPD_CHAN_DISABLED)
 157                         continue;
 158                 if (start && prev &&
 159                     prev->chan + chan_spacing == chan->chan &&
 160                     start->max_tx_power == chan->max_tx_power) {
 161                         prev = chan;
 162                         continue; /* can use same entry */
 163                 }
 164
 165                 if (start) {
 166                         pos = hostapd_eid_country_add(pos, end, chan_spacing,
 167                                                       start, prev);
 168                         start = NULL;
 169                 }
 170
 171                 /* Start new group */
 172                 start = prev = chan;
 173         }
 174
 175         if (start) {
 176                 pos = hostapd_eid_country_add(pos, end, chan_spacing,
 177                                               start, prev);
 178         }
 179
 180         if ((pos - eid) & 1) {
 181                 if (end - pos < 1)
 182                         return eid;
 183                 *pos++ = 0; /* pad for 16-bit alignment */
 184         }
 185
 186         eid[1] = (pos - eid) - 2;
 187
 188         return pos;
 189 }
 190
 191
 192 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 193 {
 194         const u8 *ie;
 195         size_t ielen;
 196
 197         ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
 198         if (ie == NULL || ielen > len)
 199                 return eid;
 200
 201         os_memcpy(eid, ie, ielen);
 202         return eid + ielen;
 203 }
 204
 205
 206 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 207                                    struct sta_info *sta,
 208                                    const struct ieee80211_mgmt *req,
 209                                    int is_p2p, size_t *resp_len)
 210 {
 211         struct ieee80211_mgmt *resp;
 212         u8 *pos, *epos;
 213         size_t buflen;
 214
 215 #define MAX_PROBERESP_LEN 768
 216         buflen = MAX_PROBERESP_LEN;
 217 #ifdef CONFIG_WPS
 218         if (hapd->wps_probe_resp_ie)
 219                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 220 #endif /* CONFIG_WPS */
 221 #ifdef CONFIG_P2P
 222         if (hapd->p2p_probe_resp_ie)
 223                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 224 #endif /* CONFIG_P2P */
 225         if (hapd->conf->vendor_elements)
 226                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 227         resp = os_zalloc(buflen);
 228         if (resp == NULL)
 229                 return NULL;
 230
 231         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 232
 233         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 234                                            WLAN_FC_STYPE_PROBE_RESP);
 235         if (req)
 236                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 237         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 238
 239         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 240         resp->u.probe_resp.beacon_int =
 241                 host_to_le16(hapd->iconf->beacon_int);
 242
 243         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 244         resp->u.probe_resp.capab_info =
 245                 host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
 246
 247         pos = resp->u.probe_resp.variable;
 248         *pos++ = WLAN_EID_SSID;
 249         *pos++ = hapd->conf->ssid.ssid_len;
 250         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 251         pos += hapd->conf->ssid.ssid_len;
 252
 253         /* Supported rates */
 254         pos = hostapd_eid_supp_rates(hapd, pos);
 255
 256         /* DS Params */
 257         pos = hostapd_eid_ds_params(hapd, pos);
 258
 259         pos = hostapd_eid_country(hapd, pos, epos - pos);
 260
 261         /* ERP Information element */
 262         pos = hostapd_eid_erp_info(hapd, pos);
 263
 264         /* Extended supported rates */
 265         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 266
 267         /* RSN, MDIE, WPA */
 268         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 269
 270         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 271
 272 #ifdef CONFIG_IEEE80211N
 273         pos = hostapd_eid_ht_capabilities(hapd, pos);
 274         pos = hostapd_eid_ht_operation(hapd, pos);
 275 #endif /* CONFIG_IEEE80211N */
 276
 277         pos = hostapd_eid_ext_capab(hapd, pos);
 278
 279         pos = hostapd_eid_time_adv(hapd, pos);
 280         pos = hostapd_eid_time_zone(hapd, pos);
 281
 282         pos = hostapd_eid_interworking(hapd, pos);
 283         pos = hostapd_eid_adv_proto(hapd, pos);
 284         pos = hostapd_eid_roaming_consortium(hapd, pos);
 285
 286 #ifdef CONFIG_IEEE80211AC
 287         pos = hostapd_eid_vht_capabilities(hapd, pos);
 288         pos = hostapd_eid_vht_operation(hapd, pos);
 289 #endif /* CONFIG_IEEE80211AC */
 290
 291         /* Wi-Fi Alliance WMM */
 292         pos = hostapd_eid_wmm(hapd, pos);
 293
 294 #ifdef CONFIG_WPS
 295         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 296                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 297                           wpabuf_len(hapd->wps_probe_resp_ie));
 298                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 299         }
 300 #endif /* CONFIG_WPS */
 301
 302 #ifdef CONFIG_P2P
 303         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 304             hapd->p2p_probe_resp_ie) {
 305                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 306                           wpabuf_len(hapd->p2p_probe_resp_ie));
 307                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 308         }
 309 #endif /* CONFIG_P2P */
 310 #ifdef CONFIG_P2P_MANAGER
 311         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 312             P2P_MANAGE)
 313                 pos = hostapd_eid_p2p_manage(hapd, pos);
 314 #endif /* CONFIG_P2P_MANAGER */
 315
 316 #ifdef CONFIG_HS20
 317         pos = hostapd_eid_hs20_indication(hapd, pos);
 318 #endif /* CONFIG_HS20 */
 319
 320         if (hapd->conf->vendor_elements) {
 321                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 322                           wpabuf_len(hapd->conf->vendor_elements));
 323                 pos += wpabuf_len(hapd->conf->vendor_elements);
 324         }
 325
 326         *resp_len = pos - (u8 *) resp;
 327         return (u8 *) resp;
 328 }
 329
 330
 331 enum ssid_match_result {
 332         NO_SSID_MATCH,
 333         EXACT_SSID_MATCH,
 334         WILDCARD_SSID_MATCH
 335 };
 336
 337 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 338                                          const u8 *ssid, size_t ssid_len,
 339                                          const u8 *ssid_list,
 340                                          size_t ssid_list_len)
 341 {
 342         const u8 *pos, *end;
 343         int wildcard = 0;
 344
 345         if (ssid_len == 0)
 346                 wildcard = 1;
 347         if (ssid_len == hapd->conf->ssid.ssid_len &&
 348             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 349                 return EXACT_SSID_MATCH;
 350
 351         if (ssid_list == NULL)
 352                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 353
 354         pos = ssid_list;
 355         end = ssid_list + ssid_list_len;
 356         while (pos + 1 <= end) {
 357                 if (pos + 2 + pos[1] > end)
 358                         break;
 359                 if (pos[1] == 0)
 360                         wildcard = 1;
 361                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 362                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 363                         return EXACT_SSID_MATCH;
 364                 pos += 2 + pos[1];
 365         }
 366
 367         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 368 }
 369
 370
 371 void handle_probe_req(struct hostapd_data *hapd,
 372                       const struct ieee80211_mgmt *mgmt, size_t len,
 373                       int ssi_signal)
 374 {
 375         u8 *resp;
 376         struct ieee802_11_elems elems;
 377         const u8 *ie;
 378         size_t ie_len;
 379         struct sta_info *sta = NULL;
 380         size_t i, resp_len;
 381         int noack;
 382         enum ssid_match_result res;
 383
 384         ie = mgmt->u.probe_req.variable;
 385         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 386                 return;
 387         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 388
 389         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 390                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 391                                             mgmt->sa, mgmt->da, mgmt->bssid,
 392                                             ie, ie_len, ssi_signal) > 0)
 393                         return;
 394
 395         if (!hapd->iconf->send_probe_response)
 396                 return;
 397
 398         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 399                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 400                            MAC2STR(mgmt->sa));
 401                 return;
 402         }
 403
 404         if ((!elems.ssid || !elems.supp_rates)) {
 405                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 406                            "without SSID or supported rates element",
 407                            MAC2STR(mgmt->sa));
 408                 return;
 409         }
 410
 411 #ifdef CONFIG_P2P
 412         if (hapd->p2p && elems.wps_ie) {
 413                 struct wpabuf *wps;
 414                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 415                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 416                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 417                                    "due to mismatch with Requested Device "
 418                                    "Type");
 419                         wpabuf_free(wps);
 420                         return;
 421                 }
 422                 wpabuf_free(wps);
 423         }
 424
 425         if (hapd->p2p && elems.p2p) {
 426                 struct wpabuf *p2p;
 427                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 428                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 429                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 430                                    "due to mismatch with Device ID");
 431                         wpabuf_free(p2p);
 432                         return;
 433                 }
 434                 wpabuf_free(p2p);
 435         }
 436 #endif /* CONFIG_P2P */
 437
 438         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 439             elems.ssid_list_len == 0) {
 440                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 441                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 442                 return;
 443         }
 444
 445         sta = ap_get_sta(hapd, mgmt->sa);
 446
 447 #ifdef CONFIG_P2P
 448         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 449             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 450             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 451                       P2P_WILDCARD_SSID_LEN) == 0) {
 452                 /* Process P2P Wildcard SSID like Wildcard SSID */
 453                 elems.ssid_len = 0;
 454         }
 455 #endif /* CONFIG_P2P */
 456
 457         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 458                          elems.ssid_list, elems.ssid_list_len);
 459         if (res != NO_SSID_MATCH) {
 460                 if (sta)
 461                         sta->ssid_probe = &hapd->conf->ssid;
 462         } else {
 463                 if (!(mgmt->da[0] & 0x01)) {
 464                         char ssid_txt[33];
 465                         ieee802_11_print_ssid(ssid_txt, elems.ssid,
 466                                               elems.ssid_len);
 467                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 468                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 469                                    MAC2STR(mgmt->sa), ssid_txt,
 470                                    MAC2STR(mgmt->da),
 471                                    elems.ssid_list ? " (SSID list)" : "");
 472                 }
 473                 return;
 474         }
 475
 476 #ifdef CONFIG_INTERWORKING
 477         if (elems.interworking && elems.interworking_len >= 1) {
 478                 u8 ant = elems.interworking[0] & 0x0f;
 479                 if (ant != INTERWORKING_ANT_WILDCARD &&
 480                     ant != hapd->conf->access_network_type) {
 481                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 482                                    " for mismatching ANT %u ignored",
 483                                    MAC2STR(mgmt->sa), ant);
 484                         return;
 485                 }
 486         }
 487
 488         if (elems.interworking &&
 489             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 490                 const u8 *hessid;
 491                 if (elems.interworking_len == 7)
 492                         hessid = elems.interworking + 1;
 493                 else
 494                         hessid = elems.interworking + 1 + 2;
 495                 if (!is_broadcast_ether_addr(hessid) &&
 496                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 497                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 498                                    " for mismatching HESSID " MACSTR
 499                                    " ignored",
 500                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 501                         return;
 502                 }
 503         }
 504 #endif /* CONFIG_INTERWORKING */
 505
 506 #ifdef CONFIG_P2P
 507         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 508             supp_rates_11b_only(&elems)) {
 509                 /* Indicates support for 11b rates only */
 510                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 511                            MACSTR " with only 802.11b rates",
 512                            MAC2STR(mgmt->sa));
 513                 return;
 514         }
 515 #endif /* CONFIG_P2P */
 516
 517         /* TODO: verify that supp_rates contains at least one matching rate
 518          * with AP configuration */
 519
 520 #ifdef CONFIG_TESTING_OPTIONS
 521         if (hapd->iconf->ignore_probe_probability > 0.0d &&
 522             drand48() < hapd->iconf->ignore_probe_probability) {
 523                 wpa_printf(MSG_INFO,
 524                            "TESTING: ignoring probe request from " MACSTR,
 525                            MAC2STR(mgmt->sa));
 526                 return;
 527         }
 528 #endif /* CONFIG_TESTING_OPTIONS */
 529
 530         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 531                                       &resp_len);
 532         if (resp == NULL)
 533                 return;
 534
 535         /*
 536          * If this is a broadcast probe request, apply no ack policy to avoid
 537          * excessive retries.
 538          */
 539         noack = !!(res == WILDCARD_SSID_MATCH &&
 540                    is_broadcast_ether_addr(mgmt->da));
 541
 542         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 543                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 544
 545         os_free(resp);
 546
 547         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 548                    "SSID", MAC2STR(mgmt->sa),
 549                    elems.ssid_len == 0 ? "broadcast" : "our");
 550 }
 551
 552
 553 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 554                                         size_t *resp_len)
 555 {
 556         /* check probe response offloading caps and print warnings */
 557         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 558                 return NULL;
 559
 560 #ifdef CONFIG_WPS
 561         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 562             (!(hapd->iface->probe_resp_offloads &
 563                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 564                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 565                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 566                            "Probe Response while not supporting this");
 567 #endif /* CONFIG_WPS */
 568
 569 #ifdef CONFIG_P2P
 570         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 571             !(hapd->iface->probe_resp_offloads &
 572               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 573                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 574                            "Probe Response while not supporting this");
 575 #endif  /* CONFIG_P2P */
 576
 577         if (hapd->conf->interworking &&
 578             !(hapd->iface->probe_resp_offloads &
 579               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 580                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 581                            "Interworking Probe Response while not supporting "
 582                            "this");
 583
 584         /* Generate a Probe Response template for the non-P2P case */
 585         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 586 }
 587
 588 #endif /* NEED_AP_MLME */
 589
 590
 591 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 592                                struct wpa_driver_ap_params *params)
 593 {
 594         struct ieee80211_mgmt *head = NULL;
 595         u8 *tail = NULL;
 596         size_t head_len = 0, tail_len = 0;
 597         u8 *resp = NULL;
 598         size_t resp_len = 0;
 599 #ifdef NEED_AP_MLME
 600         u16 capab_info;
 601         u8 *pos, *tailpos;
 602
 603 #define BEACON_HEAD_BUF_SIZE 256
 604 #define BEACON_TAIL_BUF_SIZE 512
 605         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 606         tail_len = BEACON_TAIL_BUF_SIZE;
 607 #ifdef CONFIG_WPS
 608         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 609                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 610 #endif /* CONFIG_WPS */
 611 #ifdef CONFIG_P2P
 612         if (hapd->p2p_beacon_ie)
 613                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 614 #endif /* CONFIG_P2P */
 615         if (hapd->conf->vendor_elements)
 616                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 617         tailpos = tail = os_malloc(tail_len);
 618         if (head == NULL || tail == NULL) {
 619                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 620                 os_free(head);
 621                 os_free(tail);
 622                 return -1;
 623         }
 624
 625         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 626                                            WLAN_FC_STYPE_BEACON);
 627         head->duration = host_to_le16(0);
 628         os_memset(head->da, 0xff, ETH_ALEN);
 629
 630         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 631         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 632         head->u.beacon.beacon_int =
 633                 host_to_le16(hapd->iconf->beacon_int);
 634
 635         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 636         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 637         head->u.beacon.capab_info = host_to_le16(capab_info);
 638         pos = &head->u.beacon.variable[0];
 639
 640         /* SSID */
 641         *pos++ = WLAN_EID_SSID;
 642         if (hapd->conf->ignore_broadcast_ssid == 2) {
 643                 /* clear the data, but keep the correct length of the SSID */
 644                 *pos++ = hapd->conf->ssid.ssid_len;
 645                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 646                 pos += hapd->conf->ssid.ssid_len;
 647         } else if (hapd->conf->ignore_broadcast_ssid) {
 648                 *pos++ = 0; /* empty SSID */
 649         } else {
 650                 *pos++ = hapd->conf->ssid.ssid_len;
 651                 os_memcpy(pos, hapd->conf->ssid.ssid,
 652                           hapd->conf->ssid.ssid_len);
 653                 pos += hapd->conf->ssid.ssid_len;
 654         }
 655
 656         /* Supported rates */
 657         pos = hostapd_eid_supp_rates(hapd, pos);
 658
 659         /* DS Params */
 660         pos = hostapd_eid_ds_params(hapd, pos);
 661
 662         head_len = pos - (u8 *) head;
 663
 664         tailpos = hostapd_eid_country(hapd, tailpos,
 665                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 666
 667         /* ERP Information element */
 668         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 669
 670         /* Extended supported rates */
 671         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 672
 673         /* RSN, MDIE, WPA */
 674         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 675                                   tailpos);
 676
 677         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 678                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 679
 680 #ifdef CONFIG_IEEE80211N
 681         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 682         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 683 #endif /* CONFIG_IEEE80211N */
 684
 685         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 686
 687         /*
 688          * TODO: Time Advertisement element should only be included in some
 689          * DTIM Beacon frames.
 690          */
 691         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 692
 693         tailpos = hostapd_eid_interworking(hapd, tailpos);
 694         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 695         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 696
 697 #ifdef CONFIG_IEEE80211AC
 698         tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 699         tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 700 #endif /* CONFIG_IEEE80211AC */
 701
 702         /* Wi-Fi Alliance WMM */
 703         tailpos = hostapd_eid_wmm(hapd, tailpos);
 704
 705 #ifdef CONFIG_WPS
 706         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 707                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 708                           wpabuf_len(hapd->wps_beacon_ie));
 709                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 710         }
 711 #endif /* CONFIG_WPS */
 712
 713 #ifdef CONFIG_P2P
 714         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 715                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 716                           wpabuf_len(hapd->p2p_beacon_ie));
 717                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 718         }
 719 #endif /* CONFIG_P2P */
 720 #ifdef CONFIG_P2P_MANAGER
 721         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 722             P2P_MANAGE)
 723                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 724 #endif /* CONFIG_P2P_MANAGER */
 725
 726 #ifdef CONFIG_HS20
 727         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 728 #endif /* CONFIG_HS20 */
 729
 730         if (hapd->conf->vendor_elements) {
 731                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 732                           wpabuf_len(hapd->conf->vendor_elements));
 733                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 734         }
 735
 736         tail_len = tailpos > tail ? tailpos - tail : 0;
 737
 738         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 739 #endif /* NEED_AP_MLME */
 740
 741         os_memset(params, 0, sizeof(*params));
 742         params->head = (u8 *) head;
 743         params->head_len = head_len;
 744         params->tail = tail;
 745         params->tail_len = tail_len;
 746         params->proberesp = resp;
 747         params->proberesp_len = resp_len;
 748         params->dtim_period = hapd->conf->dtim_period;
 749         params->beacon_int = hapd->iconf->beacon_int;
 750         params->basic_rates = hapd->iface->basic_rates;
 751         params->ssid = hapd->conf->ssid.ssid;
 752         params->ssid_len = hapd->conf->ssid.ssid_len;
 753         params->pairwise_ciphers = hapd->conf->rsn_pairwise ?
 754                 hapd->conf->rsn_pairwise : hapd->conf->wpa_pairwise;
 755         params->group_cipher = hapd->conf->wpa_group;
 756         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 757         params->auth_algs = hapd->conf->auth_algs;
 758         params->wpa_version = hapd->conf->wpa;
 759         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 760                 (hapd->conf->ieee802_1x &&
 761                  (hapd->conf->default_wep_key_len ||
 762                   hapd->conf->individual_wep_key_len));
 763         switch (hapd->conf->ignore_broadcast_ssid) {
 764         case 0:
 765                 params->hide_ssid = NO_SSID_HIDING;
 766                 break;
 767         case 1:
 768                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 769                 break;
 770         case 2:
 771                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 772                 break;
 773         }
 774         params->isolate = hapd->conf->isolate;
 775 #ifdef NEED_AP_MLME
 776         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 777                                 ERP_INFO_USE_PROTECTION);
 778         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 779                 hapd->iconf->preamble == SHORT_PREAMBLE;
 780         if (hapd->iface->current_mode &&
 781             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 782                 params->short_slot_time =
 783                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 784         else
 785                 params->short_slot_time = -1;
 786         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
 787                 params->ht_opmode = -1;
 788         else
 789                 params->ht_opmode = hapd->iface->ht_op_mode;
 790 #endif /* NEED_AP_MLME */
 791         params->interworking = hapd->conf->interworking;
 792         if (hapd->conf->interworking &&
 793             !is_zero_ether_addr(hapd->conf->hessid))
 794                 params->hessid = hapd->conf->hessid;
 795         params->access_network_type = hapd->conf->access_network_type;
 796         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
 797 #ifdef CONFIG_HS20
 798         params->disable_dgaf = hapd->conf->disable_dgaf;
 799 #endif /* CONFIG_HS20 */
 800         return 0;
 801 }
 802
 803
 804 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 805 {
 806         os_free(params->tail);
 807         params->tail = NULL;
 808         os_free(params->head);
 809         params->head = NULL;
 810         os_free(params->proberesp);
 811         params->proberesp = NULL;
 812 }
 813
 814
 815 void ieee802_11_set_beacon(struct hostapd_data *hapd)
 816 {
 817         struct wpa_driver_ap_params params;
 818         struct wpabuf *beacon, *proberesp, *assocresp;
 819
 820         hapd->beacon_set_done = 1;
 821
 822         if (ieee802_11_build_ap_params(hapd, &params) < 0)
 823                 return;
 824
 825         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
 826             0)
 827                 goto fail;
 828
 829         params.beacon_ies = beacon;
 830         params.proberesp_ies = proberesp;
 831         params.assocresp_ies = assocresp;
 832
 833         if (hostapd_drv_set_ap(hapd, &params))
 834                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
 835         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
 836 fail:
 837         ieee802_11_free_ap_params(&params);
 838 }
 839
 840
 841 void ieee802_11_set_beacons(struct hostapd_iface *iface)
 842 {
 843         size_t i;
 844         for (i = 0; i < iface->num_bss; i++)
 845                 ieee802_11_set_beacon(iface->bss[i]);
 846 }
 847
 848
 849 /* only update beacons if started */
 850 void ieee802_11_update_beacons(struct hostapd_iface *iface)
 851 {
 852         size_t i;
 853         for (i = 0; i < iface->num_bss; i++)
 854                 if (iface->bss[i]->beacon_set_done)
 855                         ieee802_11_set_beacon(iface->bss[i]);
 856 }
 857
 858 #endif /* CONFIG_NATIVE_WINDOWS */