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 "wps/wps_defs.h"
  25 #include "p2p/p2p.h"
  26 #include "hostapd.h"
  27 #include "ieee802_11.h"
  28 #include "wpa_auth.h"
  29 #include "wmm.h"
  30 #include "ap_config.h"
  31 #include "sta_info.h"
  32 #include "p2p_hostapd.h"
  33 #include "ap_drv_ops.h"
  34 #include "beacon.h"
  35 #include "hs20.h"
  36
  37
  38 #ifdef NEED_AP_MLME
  39
  40 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
  41 {
  42 #ifdef CONFIG_TESTING_OPTIONS
  43         if (hapd->conf->bss_load_test_set) {
  44                 if (2 + 5 > len)
  45                         return eid;
  46                 *eid++ = WLAN_EID_BSS_LOAD;
  47                 *eid++ = 5;
  48                 os_memcpy(eid, hapd->conf->bss_load_test, 5);
  49                 eid += 5;
  50         }
  51 #endif /* CONFIG_TESTING_OPTIONS */
  52         return eid;
  53 }
  54
  55
  56 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
  57 {
  58         u8 erp = 0;
  59
  60         if (hapd->iface->current_mode == NULL ||
  61             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  62                 return 0;
  63
  64         if (hapd->iface->olbc)
  65                 erp |= ERP_INFO_USE_PROTECTION;
  66         if (hapd->iface->num_sta_non_erp > 0) {
  67                 erp |= ERP_INFO_NON_ERP_PRESENT |
  68                         ERP_INFO_USE_PROTECTION;
  69         }
  70         if (hapd->iface->num_sta_no_short_preamble > 0 ||
  71             hapd->iconf->preamble == LONG_PREAMBLE)
  72                 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
  73
  74         return erp;
  75 }
  76
  77
  78 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
  79 {
  80         *eid++ = WLAN_EID_DS_PARAMS;
  81         *eid++ = 1;
  82         *eid++ = hapd->iconf->channel;
  83         return eid;
  84 }
  85
  86
  87 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
  88 {
  89         if (hapd->iface->current_mode == NULL ||
  90             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  91                 return eid;
  92
  93         /* Set NonERP_present and use_protection bits if there
  94          * are any associated NonERP stations. */
  95         /* TODO: use_protection bit can be set to zero even if
  96          * there are NonERP stations present. This optimization
  97          * might be useful if NonERP stations are "quiet".
  98          * See 802.11g/D6 E-1 for recommended practice.
  99          * In addition, Non ERP present might be set, if AP detects Non ERP
 100          * operation on other APs. */
 101
 102         /* Add ERP Information element */
 103         *eid++ = WLAN_EID_ERP_INFO;
 104         *eid++ = 1;
 105         *eid++ = ieee802_11_erp_info(hapd);
 106
 107         return eid;
 108 }
 109
 110
 111 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
 112                                     struct hostapd_channel_data *start,
 113                                     struct hostapd_channel_data *prev)
 114 {
 115         if (end - pos < 3)
 116                 return pos;
 117
 118         /* first channel number */
 119         *pos++ = start->chan;
 120         /* number of channels */
 121         *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
 122         /* maximum transmit power level */
 123         *pos++ = start->max_tx_power;
 124
 125         return pos;
 126 }
 127
 128
 129 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
 130                                 int max_len)
 131 {
 132         u8 *pos = eid;
 133         u8 *end = eid + max_len;
 134         int i;
 135         struct hostapd_hw_modes *mode;
 136         struct hostapd_channel_data *start, *prev;
 137         int chan_spacing = 1;
 138
 139         if (!hapd->iconf->ieee80211d || max_len < 6 ||
 140             hapd->iface->current_mode == NULL)
 141                 return eid;
 142
 143         *pos++ = WLAN_EID_COUNTRY;
 144         pos++; /* length will be set later */
 145         os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
 146         pos += 3;
 147
 148         mode = hapd->iface->current_mode;
 149         if (mode->mode == HOSTAPD_MODE_IEEE80211A)
 150                 chan_spacing = 4;
 151
 152         start = prev = NULL;
 153         for (i = 0; i < mode->num_channels; i++) {
 154                 struct hostapd_channel_data *chan = &mode->channels[i];
 155                 if (chan->flag & HOSTAPD_CHAN_DISABLED)
 156                         continue;
 157                 if (start && prev &&
 158                     prev->chan + chan_spacing == chan->chan &&
 159                     start->max_tx_power == chan->max_tx_power) {
 160                         prev = chan;
 161                         continue; /* can use same entry */
 162                 }
 163
 164                 if (start) {
 165                         pos = hostapd_eid_country_add(pos, end, chan_spacing,
 166                                                       start, prev);
 167                         start = NULL;
 168                 }
 169
 170                 /* Start new group */
 171                 start = prev = chan;
 172         }
 173
 174         if (start) {
 175                 pos = hostapd_eid_country_add(pos, end, chan_spacing,
 176                                               start, prev);
 177         }
 178
 179         if ((pos - eid) & 1) {
 180                 if (end - pos < 1)
 181                         return eid;
 182                 *pos++ = 0; /* pad for 16-bit alignment */
 183         }
 184
 185         eid[1] = (pos - eid) - 2;
 186
 187         return pos;
 188 }
 189
 190
 191 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 192 {
 193         const u8 *ie;
 194         size_t ielen;
 195
 196         ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
 197         if (ie == NULL || ielen > len)
 198                 return eid;
 199
 200         os_memcpy(eid, ie, ielen);
 201         return eid + ielen;
 202 }
 203
 204
 205 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
 206 {
 207         u8 chan;
 208
 209         if (!hapd->iface->cs_freq)
 210                 return eid;
 211
 212         if (ieee80211_freq_to_chan(hapd->iface->cs_freq, &chan) ==
 213             NUM_HOSTAPD_MODES)
 214                 return eid;
 215
 216         *eid++ = WLAN_EID_CHANNEL_SWITCH;
 217         *eid++ = 3;
 218         *eid++ = hapd->iface->cs_block_tx;
 219         *eid++ = chan;
 220         *eid++ = hapd->iface->cs_count;
 221
 222         return eid;
 223 }
 224
 225
 226 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 227                                    struct sta_info *sta,
 228                                    const struct ieee80211_mgmt *req,
 229                                    int is_p2p, size_t *resp_len)
 230 {
 231         struct ieee80211_mgmt *resp;
 232         u8 *pos, *epos, *old_pos;
 233         size_t buflen;
 234
 235 #define MAX_PROBERESP_LEN 768
 236         buflen = MAX_PROBERESP_LEN;
 237 #ifdef CONFIG_WPS
 238         if (hapd->wps_probe_resp_ie)
 239                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 240 #endif /* CONFIG_WPS */
 241 #ifdef CONFIG_P2P
 242         if (hapd->p2p_probe_resp_ie)
 243                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 244 #endif /* CONFIG_P2P */
 245         if (hapd->conf->vendor_elements)
 246                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 247         resp = os_zalloc(buflen);
 248         if (resp == NULL)
 249                 return NULL;
 250
 251         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 252
 253         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 254                                            WLAN_FC_STYPE_PROBE_RESP);
 255         if (req)
 256                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 257         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 258
 259         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 260         resp->u.probe_resp.beacon_int =
 261                 host_to_le16(hapd->iconf->beacon_int);
 262
 263         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 264         resp->u.probe_resp.capab_info =
 265                 host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
 266
 267         pos = resp->u.probe_resp.variable;
 268         *pos++ = WLAN_EID_SSID;
 269         *pos++ = hapd->conf->ssid.ssid_len;
 270         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 271         pos += hapd->conf->ssid.ssid_len;
 272
 273         /* Supported rates */
 274         pos = hostapd_eid_supp_rates(hapd, pos);
 275
 276         /* DS Params */
 277         pos = hostapd_eid_ds_params(hapd, pos);
 278
 279         pos = hostapd_eid_country(hapd, pos, epos - pos);
 280
 281         /* ERP Information element */
 282         pos = hostapd_eid_erp_info(hapd, pos);
 283
 284         /* Extended supported rates */
 285         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 286
 287         /* RSN, MDIE, WPA */
 288         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 289
 290         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 291
 292 #ifdef CONFIG_IEEE80211N
 293         pos = hostapd_eid_ht_capabilities(hapd, pos);
 294         pos = hostapd_eid_ht_operation(hapd, pos);
 295 #endif /* CONFIG_IEEE80211N */
 296
 297         pos = hostapd_eid_ext_capab(hapd, pos);
 298
 299         pos = hostapd_eid_time_adv(hapd, pos);
 300         pos = hostapd_eid_time_zone(hapd, pos);
 301
 302         pos = hostapd_eid_interworking(hapd, pos);
 303         pos = hostapd_eid_adv_proto(hapd, pos);
 304         pos = hostapd_eid_roaming_consortium(hapd, pos);
 305
 306         old_pos = pos;
 307         pos = hostapd_eid_csa(hapd, pos);
 308
 309         /* save an offset to the counter - should be last byte */
 310         hapd->iface->cs_c_off_proberesp = (pos != old_pos) ?
 311                 pos - (u8 *) resp - 1 : 0;
 312
 313 #ifdef CONFIG_IEEE80211AC
 314         pos = hostapd_eid_vht_capabilities(hapd, pos);
 315         pos = hostapd_eid_vht_operation(hapd, pos);
 316 #endif /* CONFIG_IEEE80211AC */
 317
 318         /* Wi-Fi Alliance WMM */
 319         pos = hostapd_eid_wmm(hapd, pos);
 320
 321 #ifdef CONFIG_WPS
 322         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 323                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 324                           wpabuf_len(hapd->wps_probe_resp_ie));
 325                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 326         }
 327 #endif /* CONFIG_WPS */
 328
 329 #ifdef CONFIG_P2P
 330         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 331             hapd->p2p_probe_resp_ie) {
 332                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 333                           wpabuf_len(hapd->p2p_probe_resp_ie));
 334                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 335         }
 336 #endif /* CONFIG_P2P */
 337 #ifdef CONFIG_P2P_MANAGER
 338         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 339             P2P_MANAGE)
 340                 pos = hostapd_eid_p2p_manage(hapd, pos);
 341 #endif /* CONFIG_P2P_MANAGER */
 342
 343 #ifdef CONFIG_HS20
 344         pos = hostapd_eid_hs20_indication(hapd, pos);
 345 #endif /* CONFIG_HS20 */
 346
 347         if (hapd->conf->vendor_elements) {
 348                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 349                           wpabuf_len(hapd->conf->vendor_elements));
 350                 pos += wpabuf_len(hapd->conf->vendor_elements);
 351         }
 352
 353         *resp_len = pos - (u8 *) resp;
 354         return (u8 *) resp;
 355 }
 356
 357
 358 enum ssid_match_result {
 359         NO_SSID_MATCH,
 360         EXACT_SSID_MATCH,
 361         WILDCARD_SSID_MATCH
 362 };
 363
 364 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 365                                          const u8 *ssid, size_t ssid_len,
 366                                          const u8 *ssid_list,
 367                                          size_t ssid_list_len)
 368 {
 369         const u8 *pos, *end;
 370         int wildcard = 0;
 371
 372         if (ssid_len == 0)
 373                 wildcard = 1;
 374         if (ssid_len == hapd->conf->ssid.ssid_len &&
 375             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 376                 return EXACT_SSID_MATCH;
 377
 378         if (ssid_list == NULL)
 379                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 380
 381         pos = ssid_list;
 382         end = ssid_list + ssid_list_len;
 383         while (pos + 1 <= end) {
 384                 if (pos + 2 + pos[1] > end)
 385                         break;
 386                 if (pos[1] == 0)
 387                         wildcard = 1;
 388                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 389                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 390                         return EXACT_SSID_MATCH;
 391                 pos += 2 + pos[1];
 392         }
 393
 394         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 395 }
 396
 397
 398 void handle_probe_req(struct hostapd_data *hapd,
 399                       const struct ieee80211_mgmt *mgmt, size_t len,
 400                       int ssi_signal)
 401 {
 402         u8 *resp;
 403         struct ieee802_11_elems elems;
 404         const u8 *ie;
 405         size_t ie_len;
 406         struct sta_info *sta = NULL;
 407         size_t i, resp_len;
 408         int noack;
 409         enum ssid_match_result res;
 410
 411         ie = mgmt->u.probe_req.variable;
 412         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 413                 return;
 414         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 415
 416         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 417                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 418                                             mgmt->sa, mgmt->da, mgmt->bssid,
 419                                             ie, ie_len, ssi_signal) > 0)
 420                         return;
 421
 422         if (!hapd->iconf->send_probe_response)
 423                 return;
 424
 425         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 426                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 427                            MAC2STR(mgmt->sa));
 428                 return;
 429         }
 430
 431         if ((!elems.ssid || !elems.supp_rates)) {
 432                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 433                            "without SSID or supported rates element",
 434                            MAC2STR(mgmt->sa));
 435                 return;
 436         }
 437
 438 #ifdef CONFIG_P2P
 439         if (hapd->p2p && elems.wps_ie) {
 440                 struct wpabuf *wps;
 441                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 442                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 443                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 444                                    "due to mismatch with Requested Device "
 445                                    "Type");
 446                         wpabuf_free(wps);
 447                         return;
 448                 }
 449                 wpabuf_free(wps);
 450         }
 451
 452         if (hapd->p2p && elems.p2p) {
 453                 struct wpabuf *p2p;
 454                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 455                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 456                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 457                                    "due to mismatch with Device ID");
 458                         wpabuf_free(p2p);
 459                         return;
 460                 }
 461                 wpabuf_free(p2p);
 462         }
 463 #endif /* CONFIG_P2P */
 464
 465         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 466             elems.ssid_list_len == 0) {
 467                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 468                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 469                 return;
 470         }
 471
 472         sta = ap_get_sta(hapd, mgmt->sa);
 473
 474 #ifdef CONFIG_P2P
 475         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 476             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 477             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 478                       P2P_WILDCARD_SSID_LEN) == 0) {
 479                 /* Process P2P Wildcard SSID like Wildcard SSID */
 480                 elems.ssid_len = 0;
 481         }
 482 #endif /* CONFIG_P2P */
 483
 484         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 485                          elems.ssid_list, elems.ssid_list_len);
 486         if (res != NO_SSID_MATCH) {
 487                 if (sta)
 488                         sta->ssid_probe = &hapd->conf->ssid;
 489         } else {
 490                 if (!(mgmt->da[0] & 0x01)) {
 491                         char ssid_txt[33];
 492                         ieee802_11_print_ssid(ssid_txt, elems.ssid,
 493                                               elems.ssid_len);
 494                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 495                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 496                                    MAC2STR(mgmt->sa), ssid_txt,
 497                                    MAC2STR(mgmt->da),
 498                                    elems.ssid_list ? " (SSID list)" : "");
 499                 }
 500                 return;
 501         }
 502
 503 #ifdef CONFIG_INTERWORKING
 504         if (elems.interworking && elems.interworking_len >= 1) {
 505                 u8 ant = elems.interworking[0] & 0x0f;
 506                 if (ant != INTERWORKING_ANT_WILDCARD &&
 507                     ant != hapd->conf->access_network_type) {
 508                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 509                                    " for mismatching ANT %u ignored",
 510                                    MAC2STR(mgmt->sa), ant);
 511                         return;
 512                 }
 513         }
 514
 515         if (elems.interworking &&
 516             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 517                 const u8 *hessid;
 518                 if (elems.interworking_len == 7)
 519                         hessid = elems.interworking + 1;
 520                 else
 521                         hessid = elems.interworking + 1 + 2;
 522                 if (!is_broadcast_ether_addr(hessid) &&
 523                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 524                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 525                                    " for mismatching HESSID " MACSTR
 526                                    " ignored",
 527                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 528                         return;
 529                 }
 530         }
 531 #endif /* CONFIG_INTERWORKING */
 532
 533 #ifdef CONFIG_P2P
 534         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 535             supp_rates_11b_only(&elems)) {
 536                 /* Indicates support for 11b rates only */
 537                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 538                            MACSTR " with only 802.11b rates",
 539                            MAC2STR(mgmt->sa));
 540                 return;
 541         }
 542 #endif /* CONFIG_P2P */
 543
 544         /* TODO: verify that supp_rates contains at least one matching rate
 545          * with AP configuration */
 546
 547 #ifdef CONFIG_TESTING_OPTIONS
 548         if (hapd->iconf->ignore_probe_probability > 0.0d &&
 549             drand48() < hapd->iconf->ignore_probe_probability) {
 550                 wpa_printf(MSG_INFO,
 551                            "TESTING: ignoring probe request from " MACSTR,
 552                            MAC2STR(mgmt->sa));
 553                 return;
 554         }
 555 #endif /* CONFIG_TESTING_OPTIONS */
 556
 557         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 558                                       &resp_len);
 559         if (resp == NULL)
 560                 return;
 561
 562         /*
 563          * If this is a broadcast probe request, apply no ack policy to avoid
 564          * excessive retries.
 565          */
 566         noack = !!(res == WILDCARD_SSID_MATCH &&
 567                    is_broadcast_ether_addr(mgmt->da));
 568
 569         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 570                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 571
 572         os_free(resp);
 573
 574         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 575                    "SSID", MAC2STR(mgmt->sa),
 576                    elems.ssid_len == 0 ? "broadcast" : "our");
 577 }
 578
 579
 580 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 581                                         size_t *resp_len)
 582 {
 583         /* check probe response offloading caps and print warnings */
 584         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 585                 return NULL;
 586
 587 #ifdef CONFIG_WPS
 588         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 589             (!(hapd->iface->probe_resp_offloads &
 590                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 591                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 592                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 593                            "Probe Response while not supporting this");
 594 #endif /* CONFIG_WPS */
 595
 596 #ifdef CONFIG_P2P
 597         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 598             !(hapd->iface->probe_resp_offloads &
 599               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 600                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 601                            "Probe Response while not supporting this");
 602 #endif  /* CONFIG_P2P */
 603
 604         if (hapd->conf->interworking &&
 605             !(hapd->iface->probe_resp_offloads &
 606               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 607                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 608                            "Interworking Probe Response while not supporting "
 609                            "this");
 610
 611         /* Generate a Probe Response template for the non-P2P case */
 612         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 613 }
 614
 615 #endif /* NEED_AP_MLME */
 616
 617
 618 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 619                                struct wpa_driver_ap_params *params)
 620 {
 621         struct ieee80211_mgmt *head = NULL;
 622         u8 *tail = NULL;
 623         size_t head_len = 0, tail_len = 0;
 624         u8 *resp = NULL;
 625         size_t resp_len = 0;
 626 #ifdef NEED_AP_MLME
 627         u16 capab_info;
 628         u8 *pos, *tailpos, *old_pos;
 629
 630 #define BEACON_HEAD_BUF_SIZE 256
 631 #define BEACON_TAIL_BUF_SIZE 512
 632         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 633         tail_len = BEACON_TAIL_BUF_SIZE;
 634 #ifdef CONFIG_WPS
 635         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 636                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 637 #endif /* CONFIG_WPS */
 638 #ifdef CONFIG_P2P
 639         if (hapd->p2p_beacon_ie)
 640                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 641 #endif /* CONFIG_P2P */
 642         if (hapd->conf->vendor_elements)
 643                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 644         tailpos = tail = os_malloc(tail_len);
 645         if (head == NULL || tail == NULL) {
 646                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 647                 os_free(head);
 648                 os_free(tail);
 649                 return -1;
 650         }
 651
 652         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 653                                            WLAN_FC_STYPE_BEACON);
 654         head->duration = host_to_le16(0);
 655         os_memset(head->da, 0xff, ETH_ALEN);
 656
 657         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 658         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 659         head->u.beacon.beacon_int =
 660                 host_to_le16(hapd->iconf->beacon_int);
 661
 662         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 663         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 664         head->u.beacon.capab_info = host_to_le16(capab_info);
 665         pos = &head->u.beacon.variable[0];
 666
 667         /* SSID */
 668         *pos++ = WLAN_EID_SSID;
 669         if (hapd->conf->ignore_broadcast_ssid == 2) {
 670                 /* clear the data, but keep the correct length of the SSID */
 671                 *pos++ = hapd->conf->ssid.ssid_len;
 672                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 673                 pos += hapd->conf->ssid.ssid_len;
 674         } else if (hapd->conf->ignore_broadcast_ssid) {
 675                 *pos++ = 0; /* empty SSID */
 676         } else {
 677                 *pos++ = hapd->conf->ssid.ssid_len;
 678                 os_memcpy(pos, hapd->conf->ssid.ssid,
 679                           hapd->conf->ssid.ssid_len);
 680                 pos += hapd->conf->ssid.ssid_len;
 681         }
 682
 683         /* Supported rates */
 684         pos = hostapd_eid_supp_rates(hapd, pos);
 685
 686         /* DS Params */
 687         pos = hostapd_eid_ds_params(hapd, pos);
 688
 689         head_len = pos - (u8 *) head;
 690
 691         tailpos = hostapd_eid_country(hapd, tailpos,
 692                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 693
 694         /* ERP Information element */
 695         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 696
 697         /* Extended supported rates */
 698         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 699
 700         /* RSN, MDIE, WPA */
 701         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 702                                   tailpos);
 703
 704         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 705                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 706
 707 #ifdef CONFIG_IEEE80211N
 708         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 709         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 710 #endif /* CONFIG_IEEE80211N */
 711
 712         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 713
 714         /*
 715          * TODO: Time Advertisement element should only be included in some
 716          * DTIM Beacon frames.
 717          */
 718         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 719
 720         tailpos = hostapd_eid_interworking(hapd, tailpos);
 721         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 722         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 723         old_pos = tailpos;
 724         tailpos = hostapd_eid_csa(hapd, tailpos);
 725         hapd->iface->cs_c_off_beacon = (old_pos != tailpos) ?
 726                 tailpos - tail - 1 : 0;
 727
 728 #ifdef CONFIG_IEEE80211AC
 729         tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 730         tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 731 #endif /* CONFIG_IEEE80211AC */
 732
 733         /* Wi-Fi Alliance WMM */
 734         tailpos = hostapd_eid_wmm(hapd, tailpos);
 735
 736 #ifdef CONFIG_WPS
 737         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 738                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 739                           wpabuf_len(hapd->wps_beacon_ie));
 740                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 741         }
 742 #endif /* CONFIG_WPS */
 743
 744 #ifdef CONFIG_P2P
 745         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 746                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 747                           wpabuf_len(hapd->p2p_beacon_ie));
 748                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 749         }
 750 #endif /* CONFIG_P2P */
 751 #ifdef CONFIG_P2P_MANAGER
 752         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 753             P2P_MANAGE)
 754                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 755 #endif /* CONFIG_P2P_MANAGER */
 756
 757 #ifdef CONFIG_HS20
 758         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 759 #endif /* CONFIG_HS20 */
 760
 761         if (hapd->conf->vendor_elements) {
 762                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 763                           wpabuf_len(hapd->conf->vendor_elements));
 764                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 765         }
 766
 767         tail_len = tailpos > tail ? tailpos - tail : 0;
 768
 769         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 770 #endif /* NEED_AP_MLME */
 771
 772         os_memset(params, 0, sizeof(*params));
 773         params->head = (u8 *) head;
 774         params->head_len = head_len;
 775         params->tail = tail;
 776         params->tail_len = tail_len;
 777         params->proberesp = resp;
 778         params->proberesp_len = resp_len;
 779         params->dtim_period = hapd->conf->dtim_period;
 780         params->beacon_int = hapd->iconf->beacon_int;
 781         params->basic_rates = hapd->iface->basic_rates;
 782         params->ssid = hapd->conf->ssid.ssid;
 783         params->ssid_len = hapd->conf->ssid.ssid_len;
 784         params->pairwise_ciphers = hapd->conf->rsn_pairwise ?
 785                 hapd->conf->rsn_pairwise : hapd->conf->wpa_pairwise;
 786         params->group_cipher = hapd->conf->wpa_group;
 787         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 788         params->auth_algs = hapd->conf->auth_algs;
 789         params->wpa_version = hapd->conf->wpa;
 790         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 791                 (hapd->conf->ieee802_1x &&
 792                  (hapd->conf->default_wep_key_len ||
 793                   hapd->conf->individual_wep_key_len));
 794         switch (hapd->conf->ignore_broadcast_ssid) {
 795         case 0:
 796                 params->hide_ssid = NO_SSID_HIDING;
 797                 break;
 798         case 1:
 799                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 800                 break;
 801         case 2:
 802                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 803                 break;
 804         }
 805         params->isolate = hapd->conf->isolate;
 806 #ifdef NEED_AP_MLME
 807         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 808                                 ERP_INFO_USE_PROTECTION);
 809         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 810                 hapd->iconf->preamble == SHORT_PREAMBLE;
 811         if (hapd->iface->current_mode &&
 812             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 813                 params->short_slot_time =
 814                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 815         else
 816                 params->short_slot_time = -1;
 817         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
 818                 params->ht_opmode = -1;
 819         else
 820                 params->ht_opmode = hapd->iface->ht_op_mode;
 821 #endif /* NEED_AP_MLME */
 822         params->interworking = hapd->conf->interworking;
 823         if (hapd->conf->interworking &&
 824             !is_zero_ether_addr(hapd->conf->hessid))
 825                 params->hessid = hapd->conf->hessid;
 826         params->access_network_type = hapd->conf->access_network_type;
 827         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
 828 #ifdef CONFIG_HS20
 829         params->disable_dgaf = hapd->conf->disable_dgaf;
 830 #endif /* CONFIG_HS20 */
 831         return 0;
 832 }
 833
 834
 835 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 836 {
 837         os_free(params->tail);
 838         params->tail = NULL;
 839         os_free(params->head);
 840         params->head = NULL;
 841         os_free(params->proberesp);
 842         params->proberesp = NULL;
 843 }
 844
 845
 846 void ieee802_11_set_beacon(struct hostapd_data *hapd)
 847 {
 848         struct wpa_driver_ap_params params;
 849         struct wpabuf *beacon, *proberesp, *assocresp;
 850
 851         if (hapd->iface->csa_in_progress) {
 852                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
 853                 return;
 854         }
 855
 856         hapd->beacon_set_done = 1;
 857
 858         if (ieee802_11_build_ap_params(hapd, &params) < 0)
 859                 return;
 860
 861         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
 862             0)
 863                 goto fail;
 864
 865         params.beacon_ies = beacon;
 866         params.proberesp_ies = proberesp;
 867         params.assocresp_ies = assocresp;
 868
 869         if (hostapd_drv_set_ap(hapd, &params))
 870                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
 871         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
 872 fail:
 873         ieee802_11_free_ap_params(&params);
 874 }
 875
 876
 877 void ieee802_11_set_beacons(struct hostapd_iface *iface)
 878 {
 879         size_t i;
 880         for (i = 0; i < iface->num_bss; i++) {
 881                 if (iface->bss[i]->started)
 882                         ieee802_11_set_beacon(iface->bss[i]);
 883         }
 884 }
 885
 886
 887 /* only update beacons if started */
 888 void ieee802_11_update_beacons(struct hostapd_iface *iface)
 889 {
 890         size_t i;
 891         for (i = 0; i < iface->num_bss; i++)
 892                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started)
 893                         ieee802_11_set_beacon(iface->bss[i]);
 894 }
 895
 896 #endif /* CONFIG_NATIVE_WINDOWS */