beacon.c revision f21452aea786ac056eb01f1cbba4f553bd502747
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 35static 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 51static 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 73static 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 82static 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 106static 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 170static 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 188static 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 250static 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 264static 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 285static 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 307static 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 328static 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 459enum ssid_match_result { 460 NO_SSID_MATCH, 461 EXACT_SSID_MATCH, 462 WILDCARD_SSID_MATCH 463}; 464 465static 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 499void 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 679static 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 717int 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 939void 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 950int 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, ¶ms) < 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, ¶ms); 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; 980fail: 981 ieee802_11_free_ap_params(¶ms); 982 return ret; 983} 984 985 986int 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 */ 1002int 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 */ 1017