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         if (len < 2 + 5)
  38                 return eid;
  39
  40 #ifdef CONFIG_TESTING_OPTIONS
  41         if (hapd->conf->bss_load_test_set) {
  42                 *eid++ = WLAN_EID_BSS_LOAD;
  43                 *eid++ = 5;
  44                 os_memcpy(eid, hapd->conf->bss_load_test, 5);
  45                 eid += 5;
  46                 return eid;
  47         }
  48 #endif /* CONFIG_TESTING_OPTIONS */
  49         if (hapd->conf->bss_load_update_period) {
  50                 *eid++ = WLAN_EID_BSS_LOAD;
  51                 *eid++ = 5;
  52                 WPA_PUT_LE16(eid, hapd->num_sta);
  53                 eid += 2;
  54                 *eid++ = hapd->iface->channel_utilization;
  55                 WPA_PUT_LE16(eid, 0); /* no available admission capabity */
  56                 eid += 2;
  57         }
  58         return eid;
  59 }
  60
  61
  62 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
  63 {
  64         u8 erp = 0;
  65
  66         if (hapd->iface->current_mode == NULL ||
  67             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  68                 return 0;
  69
  70         if (hapd->iface->olbc)
  71                 erp |= ERP_INFO_USE_PROTECTION;
  72         if (hapd->iface->num_sta_non_erp > 0) {
  73                 erp |= ERP_INFO_NON_ERP_PRESENT |
  74                         ERP_INFO_USE_PROTECTION;
  75         }
  76         if (hapd->iface->num_sta_no_short_preamble > 0 ||
  77             hapd->iconf->preamble == LONG_PREAMBLE)
  78                 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
  79
  80         return erp;
  81 }
  82
  83
  84 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
  85 {
  86         *eid++ = WLAN_EID_DS_PARAMS;
  87         *eid++ = 1;
  88         *eid++ = hapd->iconf->channel;
  89         return eid;
  90 }
  91
  92
  93 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
  94 {
  95         if (hapd->iface->current_mode == NULL ||
  96             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  97                 return eid;
  98
  99         /* Set NonERP_present and use_protection bits if there
 100          * are any associated NonERP stations. */
 101         /* TODO: use_protection bit can be set to zero even if
 102          * there are NonERP stations present. This optimization
 103          * might be useful if NonERP stations are "quiet".
 104          * See 802.11g/D6 E-1 for recommended practice.
 105          * In addition, Non ERP present might be set, if AP detects Non ERP
 106          * operation on other APs. */
 107
 108         /* Add ERP Information element */
 109         *eid++ = WLAN_EID_ERP_INFO;
 110         *eid++ = 1;
 111         *eid++ = ieee802_11_erp_info(hapd);
 112
 113         return eid;
 114 }
 115
 116
 117 static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
 118 {
 119         u8 *pos = eid;
 120         u8 local_pwr_constraint = 0;
 121         int dfs;
 122
 123         if (hapd->iface->current_mode == NULL ||
 124             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
 125                 return eid;
 126
 127         /* Let host drivers add this IE if DFS support is offloaded */
 128         if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
 129                 return eid;
 130
 131         /*
 132          * There is no DFS support and power constraint was not directly
 133          * requested by config option.
 134          */
 135         if (!hapd->iconf->ieee80211h &&
 136             hapd->iconf->local_pwr_constraint == -1)
 137                 return eid;
 138
 139         /* Check if DFS is required by regulatory. */
 140         dfs = hostapd_is_dfs_required(hapd->iface);
 141         if (dfs < 0) {
 142                 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
 143                            dfs);
 144                 dfs = 0;
 145         }
 146
 147         if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
 148                 return eid;
 149
 150         /*
 151          * ieee80211h (DFS) is enabled so Power Constraint element shall
 152          * be added when running on DFS channel whenever local_pwr_constraint
 153          * is configured or not. In order to meet regulations when TPC is not
 154          * implemented using a transmit power that is below the legal maximum
 155          * (including any mitigation factor) should help. In this case,
 156          * indicate 3 dB below maximum allowed transmit power.
 157          */
 158         if (hapd->iconf->local_pwr_constraint == -1)
 159                 local_pwr_constraint = 3;
 160
 161         /*
 162          * A STA that is not an AP shall use a transmit power less than or
 163          * equal to the local maximum transmit power level for the channel.
 164          * The local maximum transmit power can be calculated from the formula:
 165          * local max TX pwr = max TX pwr - local pwr constraint
 166          * Where max TX pwr is maximum transmit power level specified for
 167          * channel in Country element and local pwr constraint is specified
 168          * for channel in this Power Constraint element.
 169          */
 170
 171         /* Element ID */
 172         *pos++ = WLAN_EID_PWR_CONSTRAINT;
 173         /* Length */
 174         *pos++ = 1;
 175         /* Local Power Constraint */
 176         if (local_pwr_constraint)
 177                 *pos++ = local_pwr_constraint;
 178         else
 179                 *pos++ = hapd->iconf->local_pwr_constraint;
 180
 181         return pos;
 182 }
 183
 184
 185 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
 186                                     struct hostapd_channel_data *start,
 187                                     struct hostapd_channel_data *prev)
 188 {
 189         if (end - pos < 3)
 190                 return pos;
 191
 192         /* first channel number */
 193         *pos++ = start->chan;
 194         /* number of channels */
 195         *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
 196         /* maximum transmit power level */
 197         *pos++ = start->max_tx_power;
 198
 199         return pos;
 200 }
 201
 202
 203 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
 204                                 int max_len)
 205 {
 206         u8 *pos = eid;
 207         u8 *end = eid + max_len;
 208         int i;
 209         struct hostapd_hw_modes *mode;
 210         struct hostapd_channel_data *start, *prev;
 211         int chan_spacing = 1;
 212
 213         if (!hapd->iconf->ieee80211d || max_len < 6 ||
 214             hapd->iface->current_mode == NULL)
 215                 return eid;
 216
 217         *pos++ = WLAN_EID_COUNTRY;
 218         pos++; /* length will be set later */
 219         os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
 220         pos += 3;
 221
 222         mode = hapd->iface->current_mode;
 223         if (mode->mode == HOSTAPD_MODE_IEEE80211A)
 224                 chan_spacing = 4;
 225
 226         start = prev = NULL;
 227         for (i = 0; i < mode->num_channels; i++) {
 228                 struct hostapd_channel_data *chan = &mode->channels[i];
 229                 if (chan->flag & HOSTAPD_CHAN_DISABLED)
 230                         continue;
 231                 if (start && prev &&
 232                     prev->chan + chan_spacing == chan->chan &&
 233                     start->max_tx_power == chan->max_tx_power) {
 234                         prev = chan;
 235                         continue; /* can use same entry */
 236                 }
 237
 238                 if (start && prev) {
 239                         pos = hostapd_eid_country_add(pos, end, chan_spacing,
 240                                                       start, prev);
 241                         start = NULL;
 242                 }
 243
 244                 /* Start new group */
 245                 start = prev = chan;
 246         }
 247
 248         if (start) {
 249                 pos = hostapd_eid_country_add(pos, end, chan_spacing,
 250                                               start, prev);
 251         }
 252
 253         if ((pos - eid) & 1) {
 254                 if (end - pos < 1)
 255                         return eid;
 256                 *pos++ = 0; /* pad for 16-bit alignment */
 257         }
 258
 259         eid[1] = (pos - eid) - 2;
 260
 261         return pos;
 262 }
 263
 264
 265 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 266 {
 267         const u8 *ie;
 268         size_t ielen;
 269
 270         ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
 271         if (ie == NULL || ielen > len)
 272                 return eid;
 273
 274         os_memcpy(eid, ie, ielen);
 275         return eid + ielen;
 276 }
 277
 278
 279 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
 280 {
 281         u8 chan;
 282
 283         if (!hapd->cs_freq_params.freq)
 284                 return eid;
 285
 286         if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) ==
 287             NUM_HOSTAPD_MODES)
 288                 return eid;
 289
 290         *eid++ = WLAN_EID_CHANNEL_SWITCH;
 291         *eid++ = 3;
 292         *eid++ = hapd->cs_block_tx;
 293         *eid++ = chan;
 294         *eid++ = hapd->cs_count;
 295
 296         return eid;
 297 }
 298
 299
 300 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
 301 {
 302         u8 sec_ch;
 303
 304         if (!hapd->cs_freq_params.sec_channel_offset)
 305                 return eid;
 306
 307         if (hapd->cs_freq_params.sec_channel_offset == -1)
 308                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
 309         else if (hapd->cs_freq_params.sec_channel_offset == 1)
 310                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
 311         else
 312                 return eid;
 313
 314         *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
 315         *eid++ = 1;
 316         *eid++ = sec_ch;
 317
 318         return eid;
 319 }
 320
 321
 322 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
 323                                   u8 *start, unsigned int *csa_counter_off)
 324 {
 325         u8 *old_pos = pos;
 326
 327         if (!csa_counter_off)
 328                 return pos;
 329
 330         *csa_counter_off = 0;
 331         pos = hostapd_eid_csa(hapd, pos);
 332
 333         if (pos != old_pos) {
 334                 /* save an offset to the counter - should be last byte */
 335                 *csa_counter_off = pos - start - 1;
 336                 pos = hostapd_eid_secondary_channel(hapd, pos);
 337         }
 338
 339         return pos;
 340 }
 341
 342
 343 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 344                                    struct sta_info *sta,
 345                                    const struct ieee80211_mgmt *req,
 346                                    int is_p2p, size_t *resp_len)
 347 {
 348         struct ieee80211_mgmt *resp;
 349         u8 *pos, *epos;
 350         size_t buflen;
 351
 352 #define MAX_PROBERESP_LEN 768
 353         buflen = MAX_PROBERESP_LEN;
 354 #ifdef CONFIG_WPS
 355         if (hapd->wps_probe_resp_ie)
 356                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 357 #endif /* CONFIG_WPS */
 358 #ifdef CONFIG_P2P
 359         if (hapd->p2p_probe_resp_ie)
 360                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 361 #endif /* CONFIG_P2P */
 362         if (hapd->conf->vendor_elements)
 363                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 364         resp = os_zalloc(buflen);
 365         if (resp == NULL)
 366                 return NULL;
 367
 368         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 369
 370         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 371                                            WLAN_FC_STYPE_PROBE_RESP);
 372         if (req)
 373                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 374         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 375
 376         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 377         resp->u.probe_resp.beacon_int =
 378                 host_to_le16(hapd->iconf->beacon_int);
 379
 380         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 381         resp->u.probe_resp.capab_info =
 382                 host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
 383
 384         pos = resp->u.probe_resp.variable;
 385         *pos++ = WLAN_EID_SSID;
 386         *pos++ = hapd->conf->ssid.ssid_len;
 387         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 388         pos += hapd->conf->ssid.ssid_len;
 389
 390         /* Supported rates */
 391         pos = hostapd_eid_supp_rates(hapd, pos);
 392
 393         /* DS Params */
 394         pos = hostapd_eid_ds_params(hapd, pos);
 395
 396         pos = hostapd_eid_country(hapd, pos, epos - pos);
 397
 398         /* Power Constraint element */
 399         pos = hostapd_eid_pwr_constraint(hapd, pos);
 400
 401         /* ERP Information element */
 402         pos = hostapd_eid_erp_info(hapd, pos);
 403
 404         /* Extended supported rates */
 405         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 406
 407         /* RSN, MDIE, WPA */
 408         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 409
 410         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 411
 412 #ifdef CONFIG_IEEE80211N
 413         pos = hostapd_eid_ht_capabilities(hapd, pos);
 414         pos = hostapd_eid_ht_operation(hapd, pos);
 415 #endif /* CONFIG_IEEE80211N */
 416
 417         pos = hostapd_eid_ext_capab(hapd, pos);
 418
 419         pos = hostapd_eid_time_adv(hapd, pos);
 420         pos = hostapd_eid_time_zone(hapd, pos);
 421
 422         pos = hostapd_eid_interworking(hapd, pos);
 423         pos = hostapd_eid_adv_proto(hapd, pos);
 424         pos = hostapd_eid_roaming_consortium(hapd, pos);
 425
 426         pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
 427                                     &hapd->cs_c_off_proberesp);
 428 #ifdef CONFIG_IEEE80211AC
 429         pos = hostapd_eid_vht_capabilities(hapd, pos);
 430         pos = hostapd_eid_vht_operation(hapd, pos);
 431 #endif /* CONFIG_IEEE80211AC */
 432
 433         /* Wi-Fi Alliance WMM */
 434         pos = hostapd_eid_wmm(hapd, pos);
 435
 436 #ifdef CONFIG_WPS
 437         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 438                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 439                           wpabuf_len(hapd->wps_probe_resp_ie));
 440                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 441         }
 442 #endif /* CONFIG_WPS */
 443
 444 #ifdef CONFIG_P2P
 445         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 446             hapd->p2p_probe_resp_ie) {
 447                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 448                           wpabuf_len(hapd->p2p_probe_resp_ie));
 449                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 450         }
 451 #endif /* CONFIG_P2P */
 452 #ifdef CONFIG_P2P_MANAGER
 453         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 454             P2P_MANAGE)
 455                 pos = hostapd_eid_p2p_manage(hapd, pos);
 456 #endif /* CONFIG_P2P_MANAGER */
 457
 458 #ifdef CONFIG_HS20
 459         pos = hostapd_eid_hs20_indication(hapd, pos);
 460         pos = hostapd_eid_osen(hapd, pos);
 461 #endif /* CONFIG_HS20 */
 462
 463         if (hapd->conf->vendor_elements) {
 464                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 465                           wpabuf_len(hapd->conf->vendor_elements));
 466                 pos += wpabuf_len(hapd->conf->vendor_elements);
 467         }
 468
 469         *resp_len = pos - (u8 *) resp;
 470         return (u8 *) resp;
 471 }
 472
 473
 474 enum ssid_match_result {
 475         NO_SSID_MATCH,
 476         EXACT_SSID_MATCH,
 477         WILDCARD_SSID_MATCH
 478 };
 479
 480 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 481                                          const u8 *ssid, size_t ssid_len,
 482                                          const u8 *ssid_list,
 483                                          size_t ssid_list_len)
 484 {
 485         const u8 *pos, *end;
 486         int wildcard = 0;
 487
 488         if (ssid_len == 0)
 489                 wildcard = 1;
 490         if (ssid_len == hapd->conf->ssid.ssid_len &&
 491             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 492                 return EXACT_SSID_MATCH;
 493
 494         if (ssid_list == NULL)
 495                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 496
 497         pos = ssid_list;
 498         end = ssid_list + ssid_list_len;
 499         while (pos + 1 <= end) {
 500                 if (pos + 2 + pos[1] > end)
 501                         break;
 502                 if (pos[1] == 0)
 503                         wildcard = 1;
 504                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 505                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 506                         return EXACT_SSID_MATCH;
 507                 pos += 2 + pos[1];
 508         }
 509
 510         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 511 }
 512
 513
 514 void handle_probe_req(struct hostapd_data *hapd,
 515                       const struct ieee80211_mgmt *mgmt, size_t len,
 516                       int ssi_signal)
 517 {
 518         u8 *resp;
 519         struct ieee802_11_elems elems;
 520         const u8 *ie;
 521         size_t ie_len;
 522         struct sta_info *sta = NULL;
 523         size_t i, resp_len;
 524         int noack;
 525         enum ssid_match_result res;
 526
 527         ie = mgmt->u.probe_req.variable;
 528         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 529                 return;
 530         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 531
 532         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 533                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 534                                             mgmt->sa, mgmt->da, mgmt->bssid,
 535                                             ie, ie_len, ssi_signal) > 0)
 536                         return;
 537
 538         if (!hapd->iconf->send_probe_response)
 539                 return;
 540
 541         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 542                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 543                            MAC2STR(mgmt->sa));
 544                 return;
 545         }
 546
 547         if ((!elems.ssid || !elems.supp_rates)) {
 548                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 549                            "without SSID or supported rates element",
 550                            MAC2STR(mgmt->sa));
 551                 return;
 552         }
 553
 554 #ifdef CONFIG_P2P
 555         if (hapd->p2p && elems.wps_ie) {
 556                 struct wpabuf *wps;
 557                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 558                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 559                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 560                                    "due to mismatch with Requested Device "
 561                                    "Type");
 562                         wpabuf_free(wps);
 563                         return;
 564                 }
 565                 wpabuf_free(wps);
 566         }
 567
 568         if (hapd->p2p && elems.p2p) {
 569                 struct wpabuf *p2p;
 570                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 571                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 572                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 573                                    "due to mismatch with Device ID");
 574                         wpabuf_free(p2p);
 575                         return;
 576                 }
 577                 wpabuf_free(p2p);
 578         }
 579 #endif /* CONFIG_P2P */
 580
 581         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 582             elems.ssid_list_len == 0) {
 583                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 584                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 585                 return;
 586         }
 587
 588         sta = ap_get_sta(hapd, mgmt->sa);
 589
 590 #ifdef CONFIG_P2P
 591         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 592             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 593             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 594                       P2P_WILDCARD_SSID_LEN) == 0) {
 595                 /* Process P2P Wildcard SSID like Wildcard SSID */
 596                 elems.ssid_len = 0;
 597         }
 598 #endif /* CONFIG_P2P */
 599
 600         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 601                          elems.ssid_list, elems.ssid_list_len);
 602         if (res != NO_SSID_MATCH) {
 603                 if (sta)
 604                         sta->ssid_probe = &hapd->conf->ssid;
 605         } else {
 606                 if (!(mgmt->da[0] & 0x01)) {
 607                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 608                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 609                                    MAC2STR(mgmt->sa),
 610                                    wpa_ssid_txt(elems.ssid, elems.ssid_len),
 611                                    MAC2STR(mgmt->da),
 612                                    elems.ssid_list ? " (SSID list)" : "");
 613                 }
 614                 return;
 615         }
 616
 617 #ifdef CONFIG_INTERWORKING
 618         if (hapd->conf->interworking &&
 619             elems.interworking && elems.interworking_len >= 1) {
 620                 u8 ant = elems.interworking[0] & 0x0f;
 621                 if (ant != INTERWORKING_ANT_WILDCARD &&
 622                     ant != hapd->conf->access_network_type) {
 623                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 624                                    " for mismatching ANT %u ignored",
 625                                    MAC2STR(mgmt->sa), ant);
 626                         return;
 627                 }
 628         }
 629
 630         if (hapd->conf->interworking && elems.interworking &&
 631             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 632                 const u8 *hessid;
 633                 if (elems.interworking_len == 7)
 634                         hessid = elems.interworking + 1;
 635                 else
 636                         hessid = elems.interworking + 1 + 2;
 637                 if (!is_broadcast_ether_addr(hessid) &&
 638                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 639                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 640                                    " for mismatching HESSID " MACSTR
 641                                    " ignored",
 642                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 643                         return;
 644                 }
 645         }
 646 #endif /* CONFIG_INTERWORKING */
 647
 648 #ifdef CONFIG_P2P
 649         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 650             supp_rates_11b_only(&elems)) {
 651                 /* Indicates support for 11b rates only */
 652                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 653                            MACSTR " with only 802.11b rates",
 654                            MAC2STR(mgmt->sa));
 655                 return;
 656         }
 657 #endif /* CONFIG_P2P */
 658
 659         /* TODO: verify that supp_rates contains at least one matching rate
 660          * with AP configuration */
 661
 662 #ifdef CONFIG_TESTING_OPTIONS
 663         if (hapd->iconf->ignore_probe_probability > 0.0 &&
 664             drand48() < hapd->iconf->ignore_probe_probability) {
 665                 wpa_printf(MSG_INFO,
 666                            "TESTING: ignoring probe request from " MACSTR,
 667                            MAC2STR(mgmt->sa));
 668                 return;
 669         }
 670 #endif /* CONFIG_TESTING_OPTIONS */
 671
 672         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 673                                       &resp_len);
 674         if (resp == NULL)
 675                 return;
 676
 677         /*
 678          * If this is a broadcast probe request, apply no ack policy to avoid
 679          * excessive retries.
 680          */
 681         noack = !!(res == WILDCARD_SSID_MATCH &&
 682                    is_broadcast_ether_addr(mgmt->da));
 683
 684         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 685                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 686
 687         os_free(resp);
 688
 689         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 690                    "SSID", MAC2STR(mgmt->sa),
 691                    elems.ssid_len == 0 ? "broadcast" : "our");
 692 }
 693
 694
 695 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 696                                         size_t *resp_len)
 697 {
 698         /* check probe response offloading caps and print warnings */
 699         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 700                 return NULL;
 701
 702 #ifdef CONFIG_WPS
 703         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 704             (!(hapd->iface->probe_resp_offloads &
 705                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 706                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 707                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 708                            "Probe Response while not supporting this");
 709 #endif /* CONFIG_WPS */
 710
 711 #ifdef CONFIG_P2P
 712         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 713             !(hapd->iface->probe_resp_offloads &
 714               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 715                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 716                            "Probe Response while not supporting this");
 717 #endif  /* CONFIG_P2P */
 718
 719         if (hapd->conf->interworking &&
 720             !(hapd->iface->probe_resp_offloads &
 721               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 722                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 723                            "Interworking Probe Response while not supporting "
 724                            "this");
 725
 726         /* Generate a Probe Response template for the non-P2P case */
 727         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 728 }
 729
 730 #endif /* NEED_AP_MLME */
 731
 732
 733 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 734                                struct wpa_driver_ap_params *params)
 735 {
 736         struct ieee80211_mgmt *head = NULL;
 737         u8 *tail = NULL;
 738         size_t head_len = 0, tail_len = 0;
 739         u8 *resp = NULL;
 740         size_t resp_len = 0;
 741 #ifdef NEED_AP_MLME
 742         u16 capab_info;
 743         u8 *pos, *tailpos;
 744
 745 #define BEACON_HEAD_BUF_SIZE 256
 746 #define BEACON_TAIL_BUF_SIZE 512
 747         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 748         tail_len = BEACON_TAIL_BUF_SIZE;
 749 #ifdef CONFIG_WPS
 750         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 751                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 752 #endif /* CONFIG_WPS */
 753 #ifdef CONFIG_P2P
 754         if (hapd->p2p_beacon_ie)
 755                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 756 #endif /* CONFIG_P2P */
 757         if (hapd->conf->vendor_elements)
 758                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 759         tailpos = tail = os_malloc(tail_len);
 760         if (head == NULL || tail == NULL) {
 761                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 762                 os_free(head);
 763                 os_free(tail);
 764                 return -1;
 765         }
 766
 767         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 768                                            WLAN_FC_STYPE_BEACON);
 769         head->duration = host_to_le16(0);
 770         os_memset(head->da, 0xff, ETH_ALEN);
 771
 772         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 773         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 774         head->u.beacon.beacon_int =
 775                 host_to_le16(hapd->iconf->beacon_int);
 776
 777         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 778         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 779         head->u.beacon.capab_info = host_to_le16(capab_info);
 780         pos = &head->u.beacon.variable[0];
 781
 782         /* SSID */
 783         *pos++ = WLAN_EID_SSID;
 784         if (hapd->conf->ignore_broadcast_ssid == 2) {
 785                 /* clear the data, but keep the correct length of the SSID */
 786                 *pos++ = hapd->conf->ssid.ssid_len;
 787                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 788                 pos += hapd->conf->ssid.ssid_len;
 789         } else if (hapd->conf->ignore_broadcast_ssid) {
 790                 *pos++ = 0; /* empty SSID */
 791         } else {
 792                 *pos++ = hapd->conf->ssid.ssid_len;
 793                 os_memcpy(pos, hapd->conf->ssid.ssid,
 794                           hapd->conf->ssid.ssid_len);
 795                 pos += hapd->conf->ssid.ssid_len;
 796         }
 797
 798         /* Supported rates */
 799         pos = hostapd_eid_supp_rates(hapd, pos);
 800
 801         /* DS Params */
 802         pos = hostapd_eid_ds_params(hapd, pos);
 803
 804         head_len = pos - (u8 *) head;
 805
 806         tailpos = hostapd_eid_country(hapd, tailpos,
 807                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 808
 809         /* Power Constraint element */
 810         tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
 811
 812         /* ERP Information element */
 813         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 814
 815         /* Extended supported rates */
 816         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 817
 818         /* RSN, MDIE, WPA */
 819         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 820                                   tailpos);
 821
 822         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 823                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 824
 825 #ifdef CONFIG_IEEE80211N
 826         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 827         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 828 #endif /* CONFIG_IEEE80211N */
 829
 830         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 831
 832         /*
 833          * TODO: Time Advertisement element should only be included in some
 834          * DTIM Beacon frames.
 835          */
 836         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 837
 838         tailpos = hostapd_eid_interworking(hapd, tailpos);
 839         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 840         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 841         tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
 842                                         &hapd->cs_c_off_beacon);
 843 #ifdef CONFIG_IEEE80211AC
 844         tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 845         tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 846 #endif /* CONFIG_IEEE80211AC */
 847
 848         /* Wi-Fi Alliance WMM */
 849         tailpos = hostapd_eid_wmm(hapd, tailpos);
 850
 851 #ifdef CONFIG_WPS
 852         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 853                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 854                           wpabuf_len(hapd->wps_beacon_ie));
 855                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 856         }
 857 #endif /* CONFIG_WPS */
 858
 859 #ifdef CONFIG_P2P
 860         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 861                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 862                           wpabuf_len(hapd->p2p_beacon_ie));
 863                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 864         }
 865 #endif /* CONFIG_P2P */
 866 #ifdef CONFIG_P2P_MANAGER
 867         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 868             P2P_MANAGE)
 869                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 870 #endif /* CONFIG_P2P_MANAGER */
 871
 872 #ifdef CONFIG_HS20
 873         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 874         tailpos = hostapd_eid_osen(hapd, tailpos);
 875 #endif /* CONFIG_HS20 */
 876
 877         if (hapd->conf->vendor_elements) {
 878                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 879                           wpabuf_len(hapd->conf->vendor_elements));
 880                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 881         }
 882
 883         tail_len = tailpos > tail ? tailpos - tail : 0;
 884
 885         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 886 #endif /* NEED_AP_MLME */
 887
 888         os_memset(params, 0, sizeof(*params));
 889         params->head = (u8 *) head;
 890         params->head_len = head_len;
 891         params->tail = tail;
 892         params->tail_len = tail_len;
 893         params->proberesp = resp;
 894         params->proberesp_len = resp_len;
 895         params->dtim_period = hapd->conf->dtim_period;
 896         params->beacon_int = hapd->iconf->beacon_int;
 897         params->basic_rates = hapd->iface->basic_rates;
 898         params->ssid = hapd->conf->ssid.ssid;
 899         params->ssid_len = hapd->conf->ssid.ssid_len;
 900         params->pairwise_ciphers = hapd->conf->wpa_pairwise |
 901                 hapd->conf->rsn_pairwise;
 902         params->group_cipher = hapd->conf->wpa_group;
 903         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 904         params->auth_algs = hapd->conf->auth_algs;
 905         params->wpa_version = hapd->conf->wpa;
 906         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 907                 (hapd->conf->ieee802_1x &&
 908                  (hapd->conf->default_wep_key_len ||
 909                   hapd->conf->individual_wep_key_len));
 910         switch (hapd->conf->ignore_broadcast_ssid) {
 911         case 0:
 912                 params->hide_ssid = NO_SSID_HIDING;
 913                 break;
 914         case 1:
 915                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 916                 break;
 917         case 2:
 918                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 919                 break;
 920         }
 921         params->isolate = hapd->conf->isolate;
 922 #ifdef NEED_AP_MLME
 923         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 924                                 ERP_INFO_USE_PROTECTION);
 925         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 926                 hapd->iconf->preamble == SHORT_PREAMBLE;
 927         if (hapd->iface->current_mode &&
 928             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 929                 params->short_slot_time =
 930                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 931         else
 932                 params->short_slot_time = -1;
 933         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
 934                 params->ht_opmode = -1;
 935         else
 936                 params->ht_opmode = hapd->iface->ht_op_mode;
 937 #endif /* NEED_AP_MLME */
 938         params->interworking = hapd->conf->interworking;
 939         if (hapd->conf->interworking &&
 940             !is_zero_ether_addr(hapd->conf->hessid))
 941                 params->hessid = hapd->conf->hessid;
 942         params->access_network_type = hapd->conf->access_network_type;
 943         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
 944 #ifdef CONFIG_HS20
 945         params->disable_dgaf = hapd->conf->disable_dgaf;
 946         if (hapd->conf->osen) {
 947                 params->privacy = 1;
 948                 params->osen = 1;
 949         }
 950 #endif /* CONFIG_HS20 */
 951         return 0;
 952 }
 953
 954
 955 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 956 {
 957         os_free(params->tail);
 958         params->tail = NULL;
 959         os_free(params->head);
 960         params->head = NULL;
 961         os_free(params->proberesp);
 962         params->proberesp = NULL;
 963 }
 964
 965
 966 int ieee802_11_set_beacon(struct hostapd_data *hapd)
 967 {
 968         struct wpa_driver_ap_params params;
 969         struct hostapd_freq_params freq;
 970         struct hostapd_iface *iface = hapd->iface;
 971         struct hostapd_config *iconf = iface->conf;
 972         struct wpabuf *beacon, *proberesp, *assocresp;
 973         int res, ret = -1;
 974
 975         if (hapd->csa_in_progress) {
 976                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
 977                 return -1;
 978         }
 979
 980         hapd->beacon_set_done = 1;
 981
 982         if (ieee802_11_build_ap_params(hapd, &params) < 0)
 983                 return -1;
 984
 985         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
 986             0)
 987                 goto fail;
 988
 989         params.beacon_ies = beacon;
 990         params.proberesp_ies = proberesp;
 991         params.assocresp_ies = assocresp;
 992
 993         if (iface->current_mode &&
 994             hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
 995                                     iconf->channel, iconf->ieee80211n,
 996                                     iconf->ieee80211ac,
 997                                     iconf->secondary_channel,
 998                                     iconf->vht_oper_chwidth,
 999                                     iconf->vht_oper_centr_freq_seg0_idx,
1000                                     iconf->vht_oper_centr_freq_seg1_idx,
1001                                     iface->current_mode->vht_capab) == 0)
1002                 params.freq = &freq;
1003
1004         res = hostapd_drv_set_ap(hapd, &params);
1005         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
1006         if (res)
1007                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
1008         else
1009                 ret = 0;
1010 fail:
1011         ieee802_11_free_ap_params(&params);
1012         return ret;
1013 }
1014
1015
1016 int ieee802_11_set_beacons(struct hostapd_iface *iface)
1017 {
1018         size_t i;
1019         int ret = 0;
1020
1021         for (i = 0; i < iface->num_bss; i++) {
1022                 if (iface->bss[i]->started &&
1023                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1024                         ret = -1;
1025         }
1026
1027         return ret;
1028 }
1029
1030
1031 /* only update beacons if started */
1032 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1033 {
1034         size_t i;
1035         int ret = 0;
1036
1037         for (i = 0; i < iface->num_bss; i++) {
1038                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1039                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1040                         ret = -1;
1041         }
1042
1043         return ret;
1044 }
1045
1046 #endif /* CONFIG_NATIVE_WINDOWS */