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