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 software may be distributed under the terms of the BSD license.
   8  * See README for more details.
   9  */
  10
  11 #include "utils/includes.h"
  12
  13 #ifndef CONFIG_NATIVE_WINDOWS
  14
  15 #include "utils/common.h"
  16 #include "common/ieee802_11_defs.h"
  17 #include "common/ieee802_11_common.h"
  18 #include "wps/wps_defs.h"
  19 #include "p2p/p2p.h"
  20 #include "hostapd.h"
  21 #include "ieee802_11.h"
  22 #include "wpa_auth.h"
  23 #include "wmm.h"
  24 #include "ap_config.h"
  25 #include "sta_info.h"
  26 #include "p2p_hostapd.h"
  27 #include "ap_drv_ops.h"
  28 #include "beacon.h"
  29 #include "hs20.h"
  30 #include "dfs.h"
  31
  32
  33 #ifdef NEED_AP_MLME
  34
  35 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
  36 {
  37 #ifdef CONFIG_TESTING_OPTIONS
  38         if (hapd->conf->bss_load_test_set) {
  39                 if (2 + 5 > len)
  40                         return eid;
  41                 *eid++ = WLAN_EID_BSS_LOAD;
  42                 *eid++ = 5;
  43                 os_memcpy(eid, hapd->conf->bss_load_test, 5);
  44                 eid += 5;
  45         }
  46 #endif /* CONFIG_TESTING_OPTIONS */
  47         return eid;
  48 }
  49
  50
  51 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
  52 {
  53         u8 erp = 0;
  54
  55         if (hapd->iface->current_mode == NULL ||
  56             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  57                 return 0;
  58
  59         if (hapd->iface->olbc)
  60                 erp |= ERP_INFO_USE_PROTECTION;
  61         if (hapd->iface->num_sta_non_erp > 0) {
  62                 erp |= ERP_INFO_NON_ERP_PRESENT |
  63                         ERP_INFO_USE_PROTECTION;
  64         }
  65         if (hapd->iface->num_sta_no_short_preamble > 0 ||
  66             hapd->iconf->preamble == LONG_PREAMBLE)
  67                 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
  68
  69         return erp;
  70 }
  71
  72
  73 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
  74 {
  75         *eid++ = WLAN_EID_DS_PARAMS;
  76         *eid++ = 1;
  77         *eid++ = hapd->iconf->channel;
  78         return eid;
  79 }
  80
  81
  82 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
  83 {
  84         if (hapd->iface->current_mode == NULL ||
  85             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  86                 return eid;
  87
  88         /* Set NonERP_present and use_protection bits if there
  89          * are any associated NonERP stations. */
  90         /* TODO: use_protection bit can be set to zero even if
  91          * there are NonERP stations present. This optimization
  92          * might be useful if NonERP stations are "quiet".
  93          * See 802.11g/D6 E-1 for recommended practice.
  94          * In addition, Non ERP present might be set, if AP detects Non ERP
  95          * operation on other APs. */
  96
  97         /* Add ERP Information element */
  98         *eid++ = WLAN_EID_ERP_INFO;
  99         *eid++ = 1;
 100         *eid++ = ieee802_11_erp_info(hapd);
 101
 102         return eid;
 103 }
 104
 105
 106 static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
 107 {
 108         u8 *pos = eid;
 109         u8 local_pwr_constraint = 0;
 110         int dfs;
 111
 112         if (hapd->iface->current_mode == NULL ||
 113             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
 114                 return eid;
 115
 116         /*
 117          * There is no DFS support and power constraint was not directly
 118          * requested by config option.
 119          */
 120         if (!hapd->iconf->ieee80211h &&
 121             hapd->iconf->local_pwr_constraint == -1)
 122                 return eid;
 123
 124         /* Check if DFS is required by regulatory. */
 125         dfs = hostapd_is_dfs_required(hapd->iface);
 126         if (dfs < 0) {
 127                 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
 128                            dfs);
 129                 dfs = 0;
 130         }
 131
 132         if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
 133                 return eid;
 134
 135         /*
 136          * ieee80211h (DFS) is enabled so Power Constraint element shall
 137          * be added when running on DFS channel whenever local_pwr_constraint
 138          * is configured or not. In order to meet regulations when TPC is not
 139          * implemented using a transmit power that is below the legal maximum
 140          * (including any mitigation factor) should help. In this case,
 141          * indicate 3 dB below maximum allowed transmit power.
 142          */
 143         if (hapd->iconf->local_pwr_constraint == -1)
 144                 local_pwr_constraint = 3;
 145
 146         /*
 147          * A STA that is not an AP shall use a transmit power less than or
 148          * equal to the local maximum transmit power level for the channel.
 149          * The local maximum transmit power can be calculated from the formula:
 150          * local max TX pwr = max TX pwr - local pwr constraint
 151          * Where max TX pwr is maximum transmit power level specified for
 152          * channel in Country element and local pwr constraint is specified
 153          * for channel in this Power Constraint element.
 154          */
 155
 156         /* Element ID */
 157         *pos++ = WLAN_EID_PWR_CONSTRAINT;
 158         /* Length */
 159         *pos++ = 1;
 160         /* Local Power Constraint */
 161         if (local_pwr_constraint)
 162                 *pos++ = local_pwr_constraint;
 163         else
 164                 *pos++ = hapd->iconf->local_pwr_constraint;
 165
 166         return pos;
 167 }
 168
 169
 170 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
 171                                     struct hostapd_channel_data *start,
 172                                     struct hostapd_channel_data *prev)
 173 {
 174         if (end - pos < 3)
 175                 return pos;
 176
 177         /* first channel number */
 178         *pos++ = start->chan;
 179         /* number of channels */
 180         *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
 181         /* maximum transmit power level */
 182         *pos++ = start->max_tx_power;
 183
 184         return pos;
 185 }
 186
 187
 188 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
 189                                 int max_len)
 190 {
 191         u8 *pos = eid;
 192         u8 *end = eid + max_len;
 193         int i;
 194         struct hostapd_hw_modes *mode;
 195         struct hostapd_channel_data *start, *prev;
 196         int chan_spacing = 1;
 197
 198         if (!hapd->iconf->ieee80211d || max_len < 6 ||
 199             hapd->iface->current_mode == NULL)
 200                 return eid;
 201
 202         *pos++ = WLAN_EID_COUNTRY;
 203         pos++; /* length will be set later */
 204         os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
 205         pos += 3;
 206
 207         mode = hapd->iface->current_mode;
 208         if (mode->mode == HOSTAPD_MODE_IEEE80211A)
 209                 chan_spacing = 4;
 210
 211         start = prev = NULL;
 212         for (i = 0; i < mode->num_channels; i++) {
 213                 struct hostapd_channel_data *chan = &mode->channels[i];
 214                 if (chan->flag & HOSTAPD_CHAN_DISABLED)
 215                         continue;
 216                 if (start && prev &&
 217                     prev->chan + chan_spacing == chan->chan &&
 218                     start->max_tx_power == chan->max_tx_power) {
 219                         prev = chan;
 220                         continue; /* can use same entry */
 221                 }
 222
 223                 if (start) {
 224                         pos = hostapd_eid_country_add(pos, end, chan_spacing,
 225                                                       start, prev);
 226                         start = NULL;
 227                 }
 228
 229                 /* Start new group */
 230                 start = prev = chan;
 231         }
 232
 233         if (start) {
 234                 pos = hostapd_eid_country_add(pos, end, chan_spacing,
 235                                               start, prev);
 236         }
 237
 238         if ((pos - eid) & 1) {
 239                 if (end - pos < 1)
 240                         return eid;
 241                 *pos++ = 0; /* pad for 16-bit alignment */
 242         }
 243
 244         eid[1] = (pos - eid) - 2;
 245
 246         return pos;
 247 }
 248
 249
 250 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 251 {
 252         const u8 *ie;
 253         size_t ielen;
 254
 255         ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
 256         if (ie == NULL || ielen > len)
 257                 return eid;
 258
 259         os_memcpy(eid, ie, ielen);
 260         return eid + ielen;
 261 }
 262
 263
 264 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
 265 {
 266         u8 chan;
 267
 268         if (!hapd->iface->cs_freq_params.freq)
 269                 return eid;
 270
 271         if (ieee80211_freq_to_chan(hapd->iface->cs_freq_params.freq, &chan) ==
 272             NUM_HOSTAPD_MODES)
 273                 return eid;
 274
 275         *eid++ = WLAN_EID_CHANNEL_SWITCH;
 276         *eid++ = 3;
 277         *eid++ = hapd->iface->cs_block_tx;
 278         *eid++ = chan;
 279         *eid++ = hapd->iface->cs_count;
 280
 281         return eid;
 282 }
 283
 284
 285 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
 286 {
 287         u8 sec_ch;
 288
 289         if (!hapd->iface->cs_freq_params.sec_channel_offset)
 290                 return eid;
 291
 292         if (hapd->iface->cs_freq_params.sec_channel_offset == -1)
 293                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
 294         else if (hapd->iface->cs_freq_params.sec_channel_offset == 1)
 295                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
 296         else
 297                 return eid;
 298
 299         *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
 300         *eid++ = 1;
 301         *eid++ = sec_ch;
 302
 303         return eid;
 304 }
 305
 306
 307 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
 308                                   u8 *start, unsigned int *csa_counter_off)
 309 {
 310         u8 *old_pos = pos;
 311
 312         if (!csa_counter_off)
 313                 return pos;
 314
 315         *csa_counter_off = 0;
 316         pos = hostapd_eid_csa(hapd, pos);
 317
 318         if (pos != old_pos) {
 319                 /* save an offset to the counter - should be last byte */
 320                 *csa_counter_off = pos - start - 1;
 321                 pos = hostapd_eid_secondary_channel(hapd, pos);
 322         }
 323
 324         return pos;
 325 }
 326
 327
 328 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 329                                    struct sta_info *sta,
 330                                    const struct ieee80211_mgmt *req,
 331                                    int is_p2p, size_t *resp_len)
 332 {
 333         struct ieee80211_mgmt *resp;
 334         u8 *pos, *epos;
 335         size_t buflen;
 336
 337 #define MAX_PROBERESP_LEN 768
 338         buflen = MAX_PROBERESP_LEN;
 339 #ifdef CONFIG_WPS
 340         if (hapd->wps_probe_resp_ie)
 341                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 342 #endif /* CONFIG_WPS */
 343 #ifdef CONFIG_P2P
 344         if (hapd->p2p_probe_resp_ie)
 345                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 346 #endif /* CONFIG_P2P */
 347         if (hapd->conf->vendor_elements)
 348                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 349         resp = os_zalloc(buflen);
 350         if (resp == NULL)
 351                 return NULL;
 352
 353         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 354
 355         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 356                                            WLAN_FC_STYPE_PROBE_RESP);
 357         if (req)
 358                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 359         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 360
 361         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 362         resp->u.probe_resp.beacon_int =
 363                 host_to_le16(hapd->iconf->beacon_int);
 364
 365         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 366         resp->u.probe_resp.capab_info =
 367                 host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
 368
 369         pos = resp->u.probe_resp.variable;
 370         *pos++ = WLAN_EID_SSID;
 371         *pos++ = hapd->conf->ssid.ssid_len;
 372         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 373         pos += hapd->conf->ssid.ssid_len;
 374
 375         /* Supported rates */
 376         pos = hostapd_eid_supp_rates(hapd, pos);
 377
 378         /* DS Params */
 379         pos = hostapd_eid_ds_params(hapd, pos);
 380
 381         pos = hostapd_eid_country(hapd, pos, epos - pos);
 382
 383         /* Power Constraint element */
 384         pos = hostapd_eid_pwr_constraint(hapd, pos);
 385
 386         /* ERP Information element */
 387         pos = hostapd_eid_erp_info(hapd, pos);
 388
 389         /* Extended supported rates */
 390         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 391
 392         /* RSN, MDIE, WPA */
 393         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 394
 395         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 396
 397 #ifdef CONFIG_IEEE80211N
 398         pos = hostapd_eid_ht_capabilities(hapd, pos);
 399         pos = hostapd_eid_ht_operation(hapd, pos);
 400 #endif /* CONFIG_IEEE80211N */
 401
 402         pos = hostapd_eid_ext_capab(hapd, pos);
 403
 404         pos = hostapd_eid_time_adv(hapd, pos);
 405         pos = hostapd_eid_time_zone(hapd, pos);
 406
 407         pos = hostapd_eid_interworking(hapd, pos);
 408         pos = hostapd_eid_adv_proto(hapd, pos);
 409         pos = hostapd_eid_roaming_consortium(hapd, pos);
 410
 411         pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
 412                                     &hapd->iface->cs_c_off_proberesp);
 413 #ifdef CONFIG_IEEE80211AC
 414         pos = hostapd_eid_vht_capabilities(hapd, pos);
 415         pos = hostapd_eid_vht_operation(hapd, pos);
 416 #endif /* CONFIG_IEEE80211AC */
 417
 418         /* Wi-Fi Alliance WMM */
 419         pos = hostapd_eid_wmm(hapd, pos);
 420
 421 #ifdef CONFIG_WPS
 422         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 423                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 424                           wpabuf_len(hapd->wps_probe_resp_ie));
 425                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 426         }
 427 #endif /* CONFIG_WPS */
 428
 429 #ifdef CONFIG_P2P
 430         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 431             hapd->p2p_probe_resp_ie) {
 432                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 433                           wpabuf_len(hapd->p2p_probe_resp_ie));
 434                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 435         }
 436 #endif /* CONFIG_P2P */
 437 #ifdef CONFIG_P2P_MANAGER
 438         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 439             P2P_MANAGE)
 440                 pos = hostapd_eid_p2p_manage(hapd, pos);
 441 #endif /* CONFIG_P2P_MANAGER */
 442
 443 #ifdef CONFIG_HS20
 444         pos = hostapd_eid_hs20_indication(hapd, pos);
 445         pos = hostapd_eid_osen(hapd, pos);
 446 #endif /* CONFIG_HS20 */
 447
 448         if (hapd->conf->vendor_elements) {
 449                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 450                           wpabuf_len(hapd->conf->vendor_elements));
 451                 pos += wpabuf_len(hapd->conf->vendor_elements);
 452         }
 453
 454         *resp_len = pos - (u8 *) resp;
 455         return (u8 *) resp;
 456 }
 457
 458
 459 enum ssid_match_result {
 460         NO_SSID_MATCH,
 461         EXACT_SSID_MATCH,
 462         WILDCARD_SSID_MATCH
 463 };
 464
 465 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 466                                          const u8 *ssid, size_t ssid_len,
 467                                          const u8 *ssid_list,
 468                                          size_t ssid_list_len)
 469 {
 470         const u8 *pos, *end;
 471         int wildcard = 0;
 472
 473         if (ssid_len == 0)
 474                 wildcard = 1;
 475         if (ssid_len == hapd->conf->ssid.ssid_len &&
 476             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 477                 return EXACT_SSID_MATCH;
 478
 479         if (ssid_list == NULL)
 480                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 481
 482         pos = ssid_list;
 483         end = ssid_list + ssid_list_len;
 484         while (pos + 1 <= end) {
 485                 if (pos + 2 + pos[1] > end)
 486                         break;
 487                 if (pos[1] == 0)
 488                         wildcard = 1;
 489                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 490                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 491                         return EXACT_SSID_MATCH;
 492                 pos += 2 + pos[1];
 493         }
 494
 495         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 496 }
 497
 498
 499 void handle_probe_req(struct hostapd_data *hapd,
 500                       const struct ieee80211_mgmt *mgmt, size_t len,
 501                       int ssi_signal)
 502 {
 503         u8 *resp;
 504         struct ieee802_11_elems elems;
 505         const u8 *ie;
 506         size_t ie_len;
 507         struct sta_info *sta = NULL;
 508         size_t i, resp_len;
 509         int noack;
 510         enum ssid_match_result res;
 511
 512         ie = mgmt->u.probe_req.variable;
 513         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 514                 return;
 515         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 516
 517         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 518                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 519                                             mgmt->sa, mgmt->da, mgmt->bssid,
 520                                             ie, ie_len, ssi_signal) > 0)
 521                         return;
 522
 523         if (!hapd->iconf->send_probe_response)
 524                 return;
 525
 526         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 527                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 528                            MAC2STR(mgmt->sa));
 529                 return;
 530         }
 531
 532         if ((!elems.ssid || !elems.supp_rates)) {
 533                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 534                            "without SSID or supported rates element",
 535                            MAC2STR(mgmt->sa));
 536                 return;
 537         }
 538
 539 #ifdef CONFIG_P2P
 540         if (hapd->p2p && elems.wps_ie) {
 541                 struct wpabuf *wps;
 542                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 543                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 544                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 545                                    "due to mismatch with Requested Device "
 546                                    "Type");
 547                         wpabuf_free(wps);
 548                         return;
 549                 }
 550                 wpabuf_free(wps);
 551         }
 552
 553         if (hapd->p2p && elems.p2p) {
 554                 struct wpabuf *p2p;
 555                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 556                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 557                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 558                                    "due to mismatch with Device ID");
 559                         wpabuf_free(p2p);
 560                         return;
 561                 }
 562                 wpabuf_free(p2p);
 563         }
 564 #endif /* CONFIG_P2P */
 565
 566         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 567             elems.ssid_list_len == 0) {
 568                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 569                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 570                 return;
 571         }
 572
 573         sta = ap_get_sta(hapd, mgmt->sa);
 574
 575 #ifdef CONFIG_P2P
 576         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 577             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 578             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 579                       P2P_WILDCARD_SSID_LEN) == 0) {
 580                 /* Process P2P Wildcard SSID like Wildcard SSID */
 581                 elems.ssid_len = 0;
 582         }
 583 #endif /* CONFIG_P2P */
 584
 585         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 586                          elems.ssid_list, elems.ssid_list_len);
 587         if (res != NO_SSID_MATCH) {
 588                 if (sta)
 589                         sta->ssid_probe = &hapd->conf->ssid;
 590         } else {
 591                 if (!(mgmt->da[0] & 0x01)) {
 592                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 593                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 594                                    MAC2STR(mgmt->sa),
 595                                    wpa_ssid_txt(elems.ssid, elems.ssid_len),
 596                                    MAC2STR(mgmt->da),
 597                                    elems.ssid_list ? " (SSID list)" : "");
 598                 }
 599                 return;
 600         }
 601
 602 #ifdef CONFIG_INTERWORKING
 603         if (elems.interworking && elems.interworking_len >= 1) {
 604                 u8 ant = elems.interworking[0] & 0x0f;
 605                 if (ant != INTERWORKING_ANT_WILDCARD &&
 606                     ant != hapd->conf->access_network_type) {
 607                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 608                                    " for mismatching ANT %u ignored",
 609                                    MAC2STR(mgmt->sa), ant);
 610                         return;
 611                 }
 612         }
 613
 614         if (elems.interworking &&
 615             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 616                 const u8 *hessid;
 617                 if (elems.interworking_len == 7)
 618                         hessid = elems.interworking + 1;
 619                 else
 620                         hessid = elems.interworking + 1 + 2;
 621                 if (!is_broadcast_ether_addr(hessid) &&
 622                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 623                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 624                                    " for mismatching HESSID " MACSTR
 625                                    " ignored",
 626                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 627                         return;
 628                 }
 629         }
 630 #endif /* CONFIG_INTERWORKING */
 631
 632 #ifdef CONFIG_P2P
 633         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 634             supp_rates_11b_only(&elems)) {
 635                 /* Indicates support for 11b rates only */
 636                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 637                            MACSTR " with only 802.11b rates",
 638                            MAC2STR(mgmt->sa));
 639                 return;
 640         }
 641 #endif /* CONFIG_P2P */
 642
 643         /* TODO: verify that supp_rates contains at least one matching rate
 644          * with AP configuration */
 645
 646 #ifdef CONFIG_TESTING_OPTIONS
 647         if (hapd->iconf->ignore_probe_probability > 0.0d &&
 648             drand48() < hapd->iconf->ignore_probe_probability) {
 649                 wpa_printf(MSG_INFO,
 650                            "TESTING: ignoring probe request from " MACSTR,
 651                            MAC2STR(mgmt->sa));
 652                 return;
 653         }
 654 #endif /* CONFIG_TESTING_OPTIONS */
 655
 656         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 657                                       &resp_len);
 658         if (resp == NULL)
 659                 return;
 660
 661         /*
 662          * If this is a broadcast probe request, apply no ack policy to avoid
 663          * excessive retries.
 664          */
 665         noack = !!(res == WILDCARD_SSID_MATCH &&
 666                    is_broadcast_ether_addr(mgmt->da));
 667
 668         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 669                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 670
 671         os_free(resp);
 672
 673         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 674                    "SSID", MAC2STR(mgmt->sa),
 675                    elems.ssid_len == 0 ? "broadcast" : "our");
 676 }
 677
 678
 679 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 680                                         size_t *resp_len)
 681 {
 682         /* check probe response offloading caps and print warnings */
 683         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 684                 return NULL;
 685
 686 #ifdef CONFIG_WPS
 687         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 688             (!(hapd->iface->probe_resp_offloads &
 689                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 690                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 691                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 692                            "Probe Response while not supporting this");
 693 #endif /* CONFIG_WPS */
 694
 695 #ifdef CONFIG_P2P
 696         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 697             !(hapd->iface->probe_resp_offloads &
 698               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 699                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 700                            "Probe Response while not supporting this");
 701 #endif  /* CONFIG_P2P */
 702
 703         if (hapd->conf->interworking &&
 704             !(hapd->iface->probe_resp_offloads &
 705               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 706                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 707                            "Interworking Probe Response while not supporting "
 708                            "this");
 709
 710         /* Generate a Probe Response template for the non-P2P case */
 711         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 712 }
 713
 714 #endif /* NEED_AP_MLME */
 715
 716
 717 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 718                                struct wpa_driver_ap_params *params)
 719 {
 720         struct ieee80211_mgmt *head = NULL;
 721         u8 *tail = NULL;
 722         size_t head_len = 0, tail_len = 0;
 723         u8 *resp = NULL;
 724         size_t resp_len = 0;
 725 #ifdef NEED_AP_MLME
 726         u16 capab_info;
 727         u8 *pos, *tailpos;
 728
 729 #define BEACON_HEAD_BUF_SIZE 256
 730 #define BEACON_TAIL_BUF_SIZE 512
 731         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 732         tail_len = BEACON_TAIL_BUF_SIZE;
 733 #ifdef CONFIG_WPS
 734         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 735                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 736 #endif /* CONFIG_WPS */
 737 #ifdef CONFIG_P2P
 738         if (hapd->p2p_beacon_ie)
 739                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 740 #endif /* CONFIG_P2P */
 741         if (hapd->conf->vendor_elements)
 742                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 743         tailpos = tail = os_malloc(tail_len);
 744         if (head == NULL || tail == NULL) {
 745                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 746                 os_free(head);
 747                 os_free(tail);
 748                 return -1;
 749         }
 750
 751         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 752                                            WLAN_FC_STYPE_BEACON);
 753         head->duration = host_to_le16(0);
 754         os_memset(head->da, 0xff, ETH_ALEN);
 755
 756         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 757         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 758         head->u.beacon.beacon_int =
 759                 host_to_le16(hapd->iconf->beacon_int);
 760
 761         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 762         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 763         head->u.beacon.capab_info = host_to_le16(capab_info);
 764         pos = &head->u.beacon.variable[0];
 765
 766         /* SSID */
 767         *pos++ = WLAN_EID_SSID;
 768         if (hapd->conf->ignore_broadcast_ssid == 2) {
 769                 /* clear the data, but keep the correct length of the SSID */
 770                 *pos++ = hapd->conf->ssid.ssid_len;
 771                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 772                 pos += hapd->conf->ssid.ssid_len;
 773         } else if (hapd->conf->ignore_broadcast_ssid) {
 774                 *pos++ = 0; /* empty SSID */
 775         } else {
 776                 *pos++ = hapd->conf->ssid.ssid_len;
 777                 os_memcpy(pos, hapd->conf->ssid.ssid,
 778                           hapd->conf->ssid.ssid_len);
 779                 pos += hapd->conf->ssid.ssid_len;
 780         }
 781
 782         /* Supported rates */
 783         pos = hostapd_eid_supp_rates(hapd, pos);
 784
 785         /* DS Params */
 786         pos = hostapd_eid_ds_params(hapd, pos);
 787
 788         head_len = pos - (u8 *) head;
 789
 790         tailpos = hostapd_eid_country(hapd, tailpos,
 791                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 792
 793         /* Power Constraint element */
 794         tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
 795
 796         /* ERP Information element */
 797         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 798
 799         /* Extended supported rates */
 800         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 801
 802         /* RSN, MDIE, WPA */
 803         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 804                                   tailpos);
 805
 806         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 807                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 808
 809 #ifdef CONFIG_IEEE80211N
 810         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 811         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 812 #endif /* CONFIG_IEEE80211N */
 813
 814         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 815
 816         /*
 817          * TODO: Time Advertisement element should only be included in some
 818          * DTIM Beacon frames.
 819          */
 820         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 821
 822         tailpos = hostapd_eid_interworking(hapd, tailpos);
 823         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 824         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 825         tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
 826                                         &hapd->iface->cs_c_off_beacon);
 827 #ifdef CONFIG_IEEE80211AC
 828         tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 829         tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 830 #endif /* CONFIG_IEEE80211AC */
 831
 832         /* Wi-Fi Alliance WMM */
 833         tailpos = hostapd_eid_wmm(hapd, tailpos);
 834
 835 #ifdef CONFIG_WPS
 836         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 837                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 838                           wpabuf_len(hapd->wps_beacon_ie));
 839                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 840         }
 841 #endif /* CONFIG_WPS */
 842
 843 #ifdef CONFIG_P2P
 844         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 845                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 846                           wpabuf_len(hapd->p2p_beacon_ie));
 847                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 848         }
 849 #endif /* CONFIG_P2P */
 850 #ifdef CONFIG_P2P_MANAGER
 851         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 852             P2P_MANAGE)
 853                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 854 #endif /* CONFIG_P2P_MANAGER */
 855
 856 #ifdef CONFIG_HS20
 857         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 858         tailpos = hostapd_eid_osen(hapd, tailpos);
 859 #endif /* CONFIG_HS20 */
 860
 861         if (hapd->conf->vendor_elements) {
 862                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 863                           wpabuf_len(hapd->conf->vendor_elements));
 864                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 865         }
 866
 867         tail_len = tailpos > tail ? tailpos - tail : 0;
 868
 869         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 870 #endif /* NEED_AP_MLME */
 871
 872         os_memset(params, 0, sizeof(*params));
 873         params->head = (u8 *) head;
 874         params->head_len = head_len;
 875         params->tail = tail;
 876         params->tail_len = tail_len;
 877         params->proberesp = resp;
 878         params->proberesp_len = resp_len;
 879         params->dtim_period = hapd->conf->dtim_period;
 880         params->beacon_int = hapd->iconf->beacon_int;
 881         params->basic_rates = hapd->iface->basic_rates;
 882         params->ssid = hapd->conf->ssid.ssid;
 883         params->ssid_len = hapd->conf->ssid.ssid_len;
 884         params->pairwise_ciphers = hapd->conf->rsn_pairwise ?
 885                 hapd->conf->rsn_pairwise : hapd->conf->wpa_pairwise;
 886         params->group_cipher = hapd->conf->wpa_group;
 887         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 888         params->auth_algs = hapd->conf->auth_algs;
 889         params->wpa_version = hapd->conf->wpa;
 890         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 891                 (hapd->conf->ieee802_1x &&
 892                  (hapd->conf->default_wep_key_len ||
 893                   hapd->conf->individual_wep_key_len));
 894         switch (hapd->conf->ignore_broadcast_ssid) {
 895         case 0:
 896                 params->hide_ssid = NO_SSID_HIDING;
 897                 break;
 898         case 1:
 899                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 900                 break;
 901         case 2:
 902                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 903                 break;
 904         }
 905         params->isolate = hapd->conf->isolate;
 906 #ifdef NEED_AP_MLME
 907         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 908                                 ERP_INFO_USE_PROTECTION);
 909         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 910                 hapd->iconf->preamble == SHORT_PREAMBLE;
 911         if (hapd->iface->current_mode &&
 912             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 913                 params->short_slot_time =
 914                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 915         else
 916                 params->short_slot_time = -1;
 917         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
 918                 params->ht_opmode = -1;
 919         else
 920                 params->ht_opmode = hapd->iface->ht_op_mode;
 921 #endif /* NEED_AP_MLME */
 922         params->interworking = hapd->conf->interworking;
 923         if (hapd->conf->interworking &&
 924             !is_zero_ether_addr(hapd->conf->hessid))
 925                 params->hessid = hapd->conf->hessid;
 926         params->access_network_type = hapd->conf->access_network_type;
 927         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
 928 #ifdef CONFIG_HS20
 929         params->disable_dgaf = hapd->conf->disable_dgaf;
 930         if (hapd->conf->osen) {
 931                 params->privacy = 1;
 932                 params->osen = 1;
 933         }
 934 #endif /* CONFIG_HS20 */
 935         return 0;
 936 }
 937
 938
 939 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 940 {
 941         os_free(params->tail);
 942         params->tail = NULL;
 943         os_free(params->head);
 944         params->head = NULL;
 945         os_free(params->proberesp);
 946         params->proberesp = NULL;
 947 }
 948
 949
 950 int ieee802_11_set_beacon(struct hostapd_data *hapd)
 951 {
 952         struct wpa_driver_ap_params params;
 953         struct wpabuf *beacon, *proberesp, *assocresp;
 954         int res, ret = -1;
 955
 956         if (hapd->iface->csa_in_progress) {
 957                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
 958                 return -1;
 959         }
 960
 961         hapd->beacon_set_done = 1;
 962
 963         if (ieee802_11_build_ap_params(hapd, &params) < 0)
 964                 return -1;
 965
 966         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
 967             0)
 968                 goto fail;
 969
 970         params.beacon_ies = beacon;
 971         params.proberesp_ies = proberesp;
 972         params.assocresp_ies = assocresp;
 973
 974         res = hostapd_drv_set_ap(hapd, &params);
 975         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
 976         if (res)
 977                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
 978         else
 979                 ret = 0;
 980 fail:
 981         ieee802_11_free_ap_params(&params);
 982         return ret;
 983 }
 984
 985
 986 int ieee802_11_set_beacons(struct hostapd_iface *iface)
 987 {
 988         size_t i;
 989         int ret = 0;
 990
 991         for (i = 0; i < iface->num_bss; i++) {
 992                 if (iface->bss[i]->started &&
 993                     ieee802_11_set_beacon(iface->bss[i]) < 0)
 994                         ret = -1;
 995         }
 996
 997         return ret;
 998 }
 999
1000
1001 /* only update beacons if started */
1002 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1003 {
1004         size_t i;
1005         int ret = 0;
1006
1007         for (i = 0; i < iface->num_bss; i++) {
1008                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1009                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1010                         ret = -1;
1011         }
1012
1013         return ret;
1014 }
1015
1016 #endif /* CONFIG_NATIVE_WINDOWS */