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