beacon.c revision 7f65602d49069f96a7bb44da8bd79ffe8d4c6a98
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 "common/hw_features_common.h" 19#include "wps/wps_defs.h" 20#include "p2p/p2p.h" 21#include "hostapd.h" 22#include "ieee802_11.h" 23#include "wpa_auth.h" 24#include "wmm.h" 25#include "ap_config.h" 26#include "sta_info.h" 27#include "p2p_hostapd.h" 28#include "ap_drv_ops.h" 29#include "beacon.h" 30#include "hs20.h" 31#include "dfs.h" 32 33 34#ifdef NEED_AP_MLME 35 36static u8 * hostapd_eid_rm_enabled_capab(struct hostapd_data *hapd, u8 *eid, 37 size_t len) 38{ 39 if (!hapd->conf->radio_measurements || len < 2 + 4) 40 return eid; 41 42 *eid++ = WLAN_EID_RRM_ENABLED_CAPABILITIES; 43 *eid++ = 5; 44 *eid++ = (hapd->conf->radio_measurements & BIT(0)) ? 45 WLAN_RRM_CAPS_NEIGHBOR_REPORT : 0x00; 46 *eid++ = 0x00; 47 *eid++ = 0x00; 48 *eid++ = 0x00; 49 *eid++ = 0x00; 50 return eid; 51} 52 53 54static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len) 55{ 56 if (len < 2 + 5) 57 return eid; 58 59#ifdef CONFIG_TESTING_OPTIONS 60 if (hapd->conf->bss_load_test_set) { 61 *eid++ = WLAN_EID_BSS_LOAD; 62 *eid++ = 5; 63 os_memcpy(eid, hapd->conf->bss_load_test, 5); 64 eid += 5; 65 return eid; 66 } 67#endif /* CONFIG_TESTING_OPTIONS */ 68 if (hapd->conf->bss_load_update_period) { 69 *eid++ = WLAN_EID_BSS_LOAD; 70 *eid++ = 5; 71 WPA_PUT_LE16(eid, hapd->num_sta); 72 eid += 2; 73 *eid++ = hapd->iface->channel_utilization; 74 WPA_PUT_LE16(eid, 0); /* no available admission capabity */ 75 eid += 2; 76 } 77 return eid; 78} 79 80 81static u8 ieee802_11_erp_info(struct hostapd_data *hapd) 82{ 83 u8 erp = 0; 84 85 if (hapd->iface->current_mode == NULL || 86 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 87 return 0; 88 89 if (hapd->iface->olbc) 90 erp |= ERP_INFO_USE_PROTECTION; 91 if (hapd->iface->num_sta_non_erp > 0) { 92 erp |= ERP_INFO_NON_ERP_PRESENT | 93 ERP_INFO_USE_PROTECTION; 94 } 95 if (hapd->iface->num_sta_no_short_preamble > 0 || 96 hapd->iconf->preamble == LONG_PREAMBLE) 97 erp |= ERP_INFO_BARKER_PREAMBLE_MODE; 98 99 return erp; 100} 101 102 103static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid) 104{ 105 *eid++ = WLAN_EID_DS_PARAMS; 106 *eid++ = 1; 107 *eid++ = hapd->iconf->channel; 108 return eid; 109} 110 111 112static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid) 113{ 114 if (hapd->iface->current_mode == NULL || 115 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 116 return eid; 117 118 /* Set NonERP_present and use_protection bits if there 119 * are any associated NonERP stations. */ 120 /* TODO: use_protection bit can be set to zero even if 121 * there are NonERP stations present. This optimization 122 * might be useful if NonERP stations are "quiet". 123 * See 802.11g/D6 E-1 for recommended practice. 124 * In addition, Non ERP present might be set, if AP detects Non ERP 125 * operation on other APs. */ 126 127 /* Add ERP Information element */ 128 *eid++ = WLAN_EID_ERP_INFO; 129 *eid++ = 1; 130 *eid++ = ieee802_11_erp_info(hapd); 131 132 return eid; 133} 134 135 136static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid) 137{ 138 u8 *pos = eid; 139 u8 local_pwr_constraint = 0; 140 int dfs; 141 142 if (hapd->iface->current_mode == NULL || 143 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) 144 return eid; 145 146 /* Let host drivers add this IE if DFS support is offloaded */ 147 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) 148 return eid; 149 150 /* 151 * There is no DFS support and power constraint was not directly 152 * requested by config option. 153 */ 154 if (!hapd->iconf->ieee80211h && 155 hapd->iconf->local_pwr_constraint == -1) 156 return eid; 157 158 /* Check if DFS is required by regulatory. */ 159 dfs = hostapd_is_dfs_required(hapd->iface); 160 if (dfs < 0) { 161 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d", 162 dfs); 163 dfs = 0; 164 } 165 166 if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1) 167 return eid; 168 169 /* 170 * ieee80211h (DFS) is enabled so Power Constraint element shall 171 * be added when running on DFS channel whenever local_pwr_constraint 172 * is configured or not. In order to meet regulations when TPC is not 173 * implemented using a transmit power that is below the legal maximum 174 * (including any mitigation factor) should help. In this case, 175 * indicate 3 dB below maximum allowed transmit power. 176 */ 177 if (hapd->iconf->local_pwr_constraint == -1) 178 local_pwr_constraint = 3; 179 180 /* 181 * A STA that is not an AP shall use a transmit power less than or 182 * equal to the local maximum transmit power level for the channel. 183 * The local maximum transmit power can be calculated from the formula: 184 * local max TX pwr = max TX pwr - local pwr constraint 185 * Where max TX pwr is maximum transmit power level specified for 186 * channel in Country element and local pwr constraint is specified 187 * for channel in this Power Constraint element. 188 */ 189 190 /* Element ID */ 191 *pos++ = WLAN_EID_PWR_CONSTRAINT; 192 /* Length */ 193 *pos++ = 1; 194 /* Local Power Constraint */ 195 if (local_pwr_constraint) 196 *pos++ = local_pwr_constraint; 197 else 198 *pos++ = hapd->iconf->local_pwr_constraint; 199 200 return pos; 201} 202 203 204static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing, 205 struct hostapd_channel_data *start, 206 struct hostapd_channel_data *prev) 207{ 208 if (end - pos < 3) 209 return pos; 210 211 /* first channel number */ 212 *pos++ = start->chan; 213 /* number of channels */ 214 *pos++ = (prev->chan - start->chan) / chan_spacing + 1; 215 /* maximum transmit power level */ 216 *pos++ = start->max_tx_power; 217 218 return pos; 219} 220 221 222static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid, 223 int max_len) 224{ 225 u8 *pos = eid; 226 u8 *end = eid + max_len; 227 int i; 228 struct hostapd_hw_modes *mode; 229 struct hostapd_channel_data *start, *prev; 230 int chan_spacing = 1; 231 232 if (!hapd->iconf->ieee80211d || max_len < 6 || 233 hapd->iface->current_mode == NULL) 234 return eid; 235 236 *pos++ = WLAN_EID_COUNTRY; 237 pos++; /* length will be set later */ 238 os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */ 239 pos += 3; 240 241 mode = hapd->iface->current_mode; 242 if (mode->mode == HOSTAPD_MODE_IEEE80211A) 243 chan_spacing = 4; 244 245 start = prev = NULL; 246 for (i = 0; i < mode->num_channels; i++) { 247 struct hostapd_channel_data *chan = &mode->channels[i]; 248 if (chan->flag & HOSTAPD_CHAN_DISABLED) 249 continue; 250 if (start && prev && 251 prev->chan + chan_spacing == chan->chan && 252 start->max_tx_power == chan->max_tx_power) { 253 prev = chan; 254 continue; /* can use same entry */ 255 } 256 257 if (start && prev) { 258 pos = hostapd_eid_country_add(pos, end, chan_spacing, 259 start, prev); 260 start = NULL; 261 } 262 263 /* Start new group */ 264 start = prev = chan; 265 } 266 267 if (start) { 268 pos = hostapd_eid_country_add(pos, end, chan_spacing, 269 start, prev); 270 } 271 272 if ((pos - eid) & 1) { 273 if (end - pos < 1) 274 return eid; 275 *pos++ = 0; /* pad for 16-bit alignment */ 276 } 277 278 eid[1] = (pos - eid) - 2; 279 280 return pos; 281} 282 283 284static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len) 285{ 286 const u8 *ie; 287 size_t ielen; 288 289 ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen); 290 if (ie == NULL || ielen > len) 291 return eid; 292 293 os_memcpy(eid, ie, ielen); 294 return eid + ielen; 295} 296 297 298static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid) 299{ 300 u8 chan; 301 302 if (!hapd->cs_freq_params.freq) 303 return eid; 304 305 if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) == 306 NUM_HOSTAPD_MODES) 307 return eid; 308 309 *eid++ = WLAN_EID_CHANNEL_SWITCH; 310 *eid++ = 3; 311 *eid++ = hapd->cs_block_tx; 312 *eid++ = chan; 313 *eid++ = hapd->cs_count; 314 315 return eid; 316} 317 318 319static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid) 320{ 321 u8 sec_ch; 322 323 if (!hapd->cs_freq_params.sec_channel_offset) 324 return eid; 325 326 if (hapd->cs_freq_params.sec_channel_offset == -1) 327 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW; 328 else if (hapd->cs_freq_params.sec_channel_offset == 1) 329 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE; 330 else 331 return eid; 332 333 *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 334 *eid++ = 1; 335 *eid++ = sec_ch; 336 337 return eid; 338} 339 340 341static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos, 342 u8 *start, unsigned int *csa_counter_off) 343{ 344 u8 *old_pos = pos; 345 346 if (!csa_counter_off) 347 return pos; 348 349 *csa_counter_off = 0; 350 pos = hostapd_eid_csa(hapd, pos); 351 352 if (pos != old_pos) { 353 /* save an offset to the counter - should be last byte */ 354 *csa_counter_off = pos - start - 1; 355 pos = hostapd_eid_secondary_channel(hapd, pos); 356 } 357 358 return pos; 359} 360 361 362static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd, 363 struct sta_info *sta, 364 const struct ieee80211_mgmt *req, 365 int is_p2p, size_t *resp_len) 366{ 367 struct ieee80211_mgmt *resp; 368 u8 *pos, *epos; 369 size_t buflen; 370 371#define MAX_PROBERESP_LEN 768 372 buflen = MAX_PROBERESP_LEN; 373#ifdef CONFIG_WPS 374 if (hapd->wps_probe_resp_ie) 375 buflen += wpabuf_len(hapd->wps_probe_resp_ie); 376#endif /* CONFIG_WPS */ 377#ifdef CONFIG_P2P 378 if (hapd->p2p_probe_resp_ie) 379 buflen += wpabuf_len(hapd->p2p_probe_resp_ie); 380#endif /* CONFIG_P2P */ 381 if (hapd->conf->vendor_elements) 382 buflen += wpabuf_len(hapd->conf->vendor_elements); 383 if (hapd->conf->vendor_vht) { 384 buflen += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) + 385 2 + sizeof(struct ieee80211_vht_operation); 386 } 387 resp = os_zalloc(buflen); 388 if (resp == NULL) 389 return NULL; 390 391 epos = ((u8 *) resp) + MAX_PROBERESP_LEN; 392 393 resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 394 WLAN_FC_STYPE_PROBE_RESP); 395 if (req) 396 os_memcpy(resp->da, req->sa, ETH_ALEN); 397 os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN); 398 399 os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN); 400 resp->u.probe_resp.beacon_int = 401 host_to_le16(hapd->iconf->beacon_int); 402 403 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 404 resp->u.probe_resp.capab_info = 405 host_to_le16(hostapd_own_capab_info(hapd, sta, 1)); 406 407 pos = resp->u.probe_resp.variable; 408 *pos++ = WLAN_EID_SSID; 409 *pos++ = hapd->conf->ssid.ssid_len; 410 os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len); 411 pos += hapd->conf->ssid.ssid_len; 412 413 /* Supported rates */ 414 pos = hostapd_eid_supp_rates(hapd, pos); 415 416 /* DS Params */ 417 pos = hostapd_eid_ds_params(hapd, pos); 418 419 pos = hostapd_eid_country(hapd, pos, epos - pos); 420 421 /* Power Constraint element */ 422 pos = hostapd_eid_pwr_constraint(hapd, pos); 423 424 /* ERP Information element */ 425 pos = hostapd_eid_erp_info(hapd, pos); 426 427 /* Extended supported rates */ 428 pos = hostapd_eid_ext_supp_rates(hapd, pos); 429 430 /* RSN, MDIE, WPA */ 431 pos = hostapd_eid_wpa(hapd, pos, epos - pos); 432 433 pos = hostapd_eid_bss_load(hapd, pos, epos - pos); 434 435 pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos); 436 437#ifdef CONFIG_IEEE80211N 438 pos = hostapd_eid_ht_capabilities(hapd, pos); 439 pos = hostapd_eid_ht_operation(hapd, pos); 440#endif /* CONFIG_IEEE80211N */ 441 442 pos = hostapd_eid_ext_capab(hapd, pos); 443 444 pos = hostapd_eid_time_adv(hapd, pos); 445 pos = hostapd_eid_time_zone(hapd, pos); 446 447 pos = hostapd_eid_interworking(hapd, pos); 448 pos = hostapd_eid_adv_proto(hapd, pos); 449 pos = hostapd_eid_roaming_consortium(hapd, pos); 450 451 pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp, 452 &hapd->cs_c_off_proberesp); 453#ifdef CONFIG_IEEE80211AC 454 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) { 455 pos = hostapd_eid_vht_capabilities(hapd, pos); 456 pos = hostapd_eid_vht_operation(hapd, pos); 457 } 458 if (hapd->conf->vendor_vht) 459 pos = hostapd_eid_vendor_vht(hapd, pos); 460#endif /* CONFIG_IEEE80211AC */ 461 462 /* Wi-Fi Alliance WMM */ 463 pos = hostapd_eid_wmm(hapd, pos); 464 465#ifdef CONFIG_WPS 466 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) { 467 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie), 468 wpabuf_len(hapd->wps_probe_resp_ie)); 469 pos += wpabuf_len(hapd->wps_probe_resp_ie); 470 } 471#endif /* CONFIG_WPS */ 472 473#ifdef CONFIG_P2P 474 if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p && 475 hapd->p2p_probe_resp_ie) { 476 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie), 477 wpabuf_len(hapd->p2p_probe_resp_ie)); 478 pos += wpabuf_len(hapd->p2p_probe_resp_ie); 479 } 480#endif /* CONFIG_P2P */ 481#ifdef CONFIG_P2P_MANAGER 482 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 483 P2P_MANAGE) 484 pos = hostapd_eid_p2p_manage(hapd, pos); 485#endif /* CONFIG_P2P_MANAGER */ 486 487#ifdef CONFIG_HS20 488 pos = hostapd_eid_hs20_indication(hapd, pos); 489 pos = hostapd_eid_osen(hapd, pos); 490#endif /* CONFIG_HS20 */ 491 492 if (hapd->conf->vendor_elements) { 493 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements), 494 wpabuf_len(hapd->conf->vendor_elements)); 495 pos += wpabuf_len(hapd->conf->vendor_elements); 496 } 497 498 *resp_len = pos - (u8 *) resp; 499 return (u8 *) resp; 500} 501 502 503enum ssid_match_result { 504 NO_SSID_MATCH, 505 EXACT_SSID_MATCH, 506 WILDCARD_SSID_MATCH 507}; 508 509static enum ssid_match_result ssid_match(struct hostapd_data *hapd, 510 const u8 *ssid, size_t ssid_len, 511 const u8 *ssid_list, 512 size_t ssid_list_len) 513{ 514 const u8 *pos, *end; 515 int wildcard = 0; 516 517 if (ssid_len == 0) 518 wildcard = 1; 519 if (ssid_len == hapd->conf->ssid.ssid_len && 520 os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0) 521 return EXACT_SSID_MATCH; 522 523 if (ssid_list == NULL) 524 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 525 526 pos = ssid_list; 527 end = ssid_list + ssid_list_len; 528 while (pos + 1 <= end) { 529 if (pos + 2 + pos[1] > end) 530 break; 531 if (pos[1] == 0) 532 wildcard = 1; 533 if (pos[1] == hapd->conf->ssid.ssid_len && 534 os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0) 535 return EXACT_SSID_MATCH; 536 pos += 2 + pos[1]; 537 } 538 539 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 540} 541 542 543void handle_probe_req(struct hostapd_data *hapd, 544 const struct ieee80211_mgmt *mgmt, size_t len, 545 int ssi_signal) 546{ 547 u8 *resp; 548 struct ieee802_11_elems elems; 549 const u8 *ie; 550 size_t ie_len; 551 struct sta_info *sta = NULL; 552 size_t i, resp_len; 553 int noack; 554 enum ssid_match_result res; 555 556 ie = mgmt->u.probe_req.variable; 557 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)) 558 return; 559 ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)); 560 561 for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++) 562 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx, 563 mgmt->sa, mgmt->da, mgmt->bssid, 564 ie, ie_len, ssi_signal) > 0) 565 return; 566 567 if (!hapd->iconf->send_probe_response) 568 return; 569 570 if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) { 571 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR, 572 MAC2STR(mgmt->sa)); 573 return; 574 } 575 576 if ((!elems.ssid || !elems.supp_rates)) { 577 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request " 578 "without SSID or supported rates element", 579 MAC2STR(mgmt->sa)); 580 return; 581 } 582 583 /* 584 * No need to reply if the Probe Request frame was sent on an adjacent 585 * channel. IEEE Std 802.11-2012 describes this as a requirement for an 586 * AP with dot11RadioMeasurementActivated set to true, but strictly 587 * speaking does not allow such ignoring of Probe Request frames if 588 * dot11RadioMeasurementActivated is false. Anyway, this can help reduce 589 * number of unnecessary Probe Response frames for cases where the STA 590 * is less likely to see them (Probe Request frame sent on a 591 * neighboring, but partially overlapping, channel). 592 */ 593 if (elems.ds_params && elems.ds_params_len == 1 && 594 hapd->iface->current_mode && 595 (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G || 596 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) && 597 hapd->iconf->channel != elems.ds_params[0]) { 598 wpa_printf(MSG_DEBUG, 599 "Ignore Probe Request due to DS Params mismatch: chan=%u != ds.chan=%u", 600 hapd->iconf->channel, elems.ds_params[0]); 601 return; 602 } 603 604#ifdef CONFIG_P2P 605 if (hapd->p2p && elems.wps_ie) { 606 struct wpabuf *wps; 607 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA); 608 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) { 609 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 610 "due to mismatch with Requested Device " 611 "Type"); 612 wpabuf_free(wps); 613 return; 614 } 615 wpabuf_free(wps); 616 } 617 618 if (hapd->p2p && elems.p2p) { 619 struct wpabuf *p2p; 620 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE); 621 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) { 622 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 623 "due to mismatch with Device ID"); 624 wpabuf_free(p2p); 625 return; 626 } 627 wpabuf_free(p2p); 628 } 629#endif /* CONFIG_P2P */ 630 631 if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 && 632 elems.ssid_list_len == 0) { 633 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for " 634 "broadcast SSID ignored", MAC2STR(mgmt->sa)); 635 return; 636 } 637 638 sta = ap_get_sta(hapd, mgmt->sa); 639 640#ifdef CONFIG_P2P 641 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 642 elems.ssid_len == P2P_WILDCARD_SSID_LEN && 643 os_memcmp(elems.ssid, P2P_WILDCARD_SSID, 644 P2P_WILDCARD_SSID_LEN) == 0) { 645 /* Process P2P Wildcard SSID like Wildcard SSID */ 646 elems.ssid_len = 0; 647 } 648#endif /* CONFIG_P2P */ 649 650 res = ssid_match(hapd, elems.ssid, elems.ssid_len, 651 elems.ssid_list, elems.ssid_list_len); 652 if (res != NO_SSID_MATCH) { 653 if (sta) 654 sta->ssid_probe = &hapd->conf->ssid; 655 } else { 656 if (!(mgmt->da[0] & 0x01)) { 657 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 658 " for foreign SSID '%s' (DA " MACSTR ")%s", 659 MAC2STR(mgmt->sa), 660 wpa_ssid_txt(elems.ssid, elems.ssid_len), 661 MAC2STR(mgmt->da), 662 elems.ssid_list ? " (SSID list)" : ""); 663 } 664 return; 665 } 666 667#ifdef CONFIG_INTERWORKING 668 if (hapd->conf->interworking && 669 elems.interworking && elems.interworking_len >= 1) { 670 u8 ant = elems.interworking[0] & 0x0f; 671 if (ant != INTERWORKING_ANT_WILDCARD && 672 ant != hapd->conf->access_network_type) { 673 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 674 " for mismatching ANT %u ignored", 675 MAC2STR(mgmt->sa), ant); 676 return; 677 } 678 } 679 680 if (hapd->conf->interworking && elems.interworking && 681 (elems.interworking_len == 7 || elems.interworking_len == 9)) { 682 const u8 *hessid; 683 if (elems.interworking_len == 7) 684 hessid = elems.interworking + 1; 685 else 686 hessid = elems.interworking + 1 + 2; 687 if (!is_broadcast_ether_addr(hessid) && 688 os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) { 689 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 690 " for mismatching HESSID " MACSTR 691 " ignored", 692 MAC2STR(mgmt->sa), MAC2STR(hessid)); 693 return; 694 } 695 } 696#endif /* CONFIG_INTERWORKING */ 697 698#ifdef CONFIG_P2P 699 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 700 supp_rates_11b_only(&elems)) { 701 /* Indicates support for 11b rates only */ 702 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from " 703 MACSTR " with only 802.11b rates", 704 MAC2STR(mgmt->sa)); 705 return; 706 } 707#endif /* CONFIG_P2P */ 708 709 /* TODO: verify that supp_rates contains at least one matching rate 710 * with AP configuration */ 711 712#ifdef CONFIG_TESTING_OPTIONS 713 if (hapd->iconf->ignore_probe_probability > 0.0 && 714 drand48() < hapd->iconf->ignore_probe_probability) { 715 wpa_printf(MSG_INFO, 716 "TESTING: ignoring probe request from " MACSTR, 717 MAC2STR(mgmt->sa)); 718 return; 719 } 720#endif /* CONFIG_TESTING_OPTIONS */ 721 722 resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL, 723 &resp_len); 724 if (resp == NULL) 725 return; 726 727 /* 728 * If this is a broadcast probe request, apply no ack policy to avoid 729 * excessive retries. 730 */ 731 noack = !!(res == WILDCARD_SSID_MATCH && 732 is_broadcast_ether_addr(mgmt->da)); 733 734 if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0) 735 wpa_printf(MSG_INFO, "handle_probe_req: send failed"); 736 737 os_free(resp); 738 739 wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s " 740 "SSID", MAC2STR(mgmt->sa), 741 elems.ssid_len == 0 ? "broadcast" : "our"); 742} 743 744 745static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd, 746 size_t *resp_len) 747{ 748 /* check probe response offloading caps and print warnings */ 749 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD)) 750 return NULL; 751 752#ifdef CONFIG_WPS 753 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie && 754 (!(hapd->iface->probe_resp_offloads & 755 (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS | 756 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2)))) 757 wpa_printf(MSG_WARNING, "Device is trying to offload WPS " 758 "Probe Response while not supporting this"); 759#endif /* CONFIG_WPS */ 760 761#ifdef CONFIG_P2P 762 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie && 763 !(hapd->iface->probe_resp_offloads & 764 WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P)) 765 wpa_printf(MSG_WARNING, "Device is trying to offload P2P " 766 "Probe Response while not supporting this"); 767#endif /* CONFIG_P2P */ 768 769 if (hapd->conf->interworking && 770 !(hapd->iface->probe_resp_offloads & 771 WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING)) 772 wpa_printf(MSG_WARNING, "Device is trying to offload " 773 "Interworking Probe Response while not supporting " 774 "this"); 775 776 /* Generate a Probe Response template for the non-P2P case */ 777 return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len); 778} 779 780#endif /* NEED_AP_MLME */ 781 782 783int ieee802_11_build_ap_params(struct hostapd_data *hapd, 784 struct wpa_driver_ap_params *params) 785{ 786 struct ieee80211_mgmt *head = NULL; 787 u8 *tail = NULL; 788 size_t head_len = 0, tail_len = 0; 789 u8 *resp = NULL; 790 size_t resp_len = 0; 791#ifdef NEED_AP_MLME 792 u16 capab_info; 793 u8 *pos, *tailpos; 794 795#define BEACON_HEAD_BUF_SIZE 256 796#define BEACON_TAIL_BUF_SIZE 512 797 head = os_zalloc(BEACON_HEAD_BUF_SIZE); 798 tail_len = BEACON_TAIL_BUF_SIZE; 799#ifdef CONFIG_WPS 800 if (hapd->conf->wps_state && hapd->wps_beacon_ie) 801 tail_len += wpabuf_len(hapd->wps_beacon_ie); 802#endif /* CONFIG_WPS */ 803#ifdef CONFIG_P2P 804 if (hapd->p2p_beacon_ie) 805 tail_len += wpabuf_len(hapd->p2p_beacon_ie); 806#endif /* CONFIG_P2P */ 807 if (hapd->conf->vendor_elements) 808 tail_len += wpabuf_len(hapd->conf->vendor_elements); 809 810#ifdef CONFIG_IEEE80211AC 811 if (hapd->conf->vendor_vht) { 812 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) + 813 2 + sizeof(struct ieee80211_vht_operation); 814 } 815#endif /* CONFIG_IEEE80211AC */ 816 817 tailpos = tail = os_malloc(tail_len); 818 if (head == NULL || tail == NULL) { 819 wpa_printf(MSG_ERROR, "Failed to set beacon data"); 820 os_free(head); 821 os_free(tail); 822 return -1; 823 } 824 825 head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 826 WLAN_FC_STYPE_BEACON); 827 head->duration = host_to_le16(0); 828 os_memset(head->da, 0xff, ETH_ALEN); 829 830 os_memcpy(head->sa, hapd->own_addr, ETH_ALEN); 831 os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN); 832 head->u.beacon.beacon_int = 833 host_to_le16(hapd->iconf->beacon_int); 834 835 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 836 capab_info = hostapd_own_capab_info(hapd, NULL, 0); 837 head->u.beacon.capab_info = host_to_le16(capab_info); 838 pos = &head->u.beacon.variable[0]; 839 840 /* SSID */ 841 *pos++ = WLAN_EID_SSID; 842 if (hapd->conf->ignore_broadcast_ssid == 2) { 843 /* clear the data, but keep the correct length of the SSID */ 844 *pos++ = hapd->conf->ssid.ssid_len; 845 os_memset(pos, 0, hapd->conf->ssid.ssid_len); 846 pos += hapd->conf->ssid.ssid_len; 847 } else if (hapd->conf->ignore_broadcast_ssid) { 848 *pos++ = 0; /* empty SSID */ 849 } else { 850 *pos++ = hapd->conf->ssid.ssid_len; 851 os_memcpy(pos, hapd->conf->ssid.ssid, 852 hapd->conf->ssid.ssid_len); 853 pos += hapd->conf->ssid.ssid_len; 854 } 855 856 /* Supported rates */ 857 pos = hostapd_eid_supp_rates(hapd, pos); 858 859 /* DS Params */ 860 pos = hostapd_eid_ds_params(hapd, pos); 861 862 head_len = pos - (u8 *) head; 863 864 tailpos = hostapd_eid_country(hapd, tailpos, 865 tail + BEACON_TAIL_BUF_SIZE - tailpos); 866 867 /* Power Constraint element */ 868 tailpos = hostapd_eid_pwr_constraint(hapd, tailpos); 869 870 /* ERP Information element */ 871 tailpos = hostapd_eid_erp_info(hapd, tailpos); 872 873 /* Extended supported rates */ 874 tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos); 875 876 /* RSN, MDIE, WPA */ 877 tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - 878 tailpos); 879 880 tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos, 881 tail + BEACON_TAIL_BUF_SIZE - 882 tailpos); 883 884 tailpos = hostapd_eid_bss_load(hapd, tailpos, 885 tail + BEACON_TAIL_BUF_SIZE - tailpos); 886 887#ifdef CONFIG_IEEE80211N 888 tailpos = hostapd_eid_ht_capabilities(hapd, tailpos); 889 tailpos = hostapd_eid_ht_operation(hapd, tailpos); 890#endif /* CONFIG_IEEE80211N */ 891 892 tailpos = hostapd_eid_ext_capab(hapd, tailpos); 893 894 /* 895 * TODO: Time Advertisement element should only be included in some 896 * DTIM Beacon frames. 897 */ 898 tailpos = hostapd_eid_time_adv(hapd, tailpos); 899 900 tailpos = hostapd_eid_interworking(hapd, tailpos); 901 tailpos = hostapd_eid_adv_proto(hapd, tailpos); 902 tailpos = hostapd_eid_roaming_consortium(hapd, tailpos); 903 tailpos = hostapd_add_csa_elems(hapd, tailpos, tail, 904 &hapd->cs_c_off_beacon); 905#ifdef CONFIG_IEEE80211AC 906 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) { 907 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos); 908 tailpos = hostapd_eid_vht_operation(hapd, tailpos); 909 } 910 if (hapd->conf->vendor_vht) 911 tailpos = hostapd_eid_vendor_vht(hapd, tailpos); 912#endif /* CONFIG_IEEE80211AC */ 913 914 /* Wi-Fi Alliance WMM */ 915 tailpos = hostapd_eid_wmm(hapd, tailpos); 916 917#ifdef CONFIG_WPS 918 if (hapd->conf->wps_state && hapd->wps_beacon_ie) { 919 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie), 920 wpabuf_len(hapd->wps_beacon_ie)); 921 tailpos += wpabuf_len(hapd->wps_beacon_ie); 922 } 923#endif /* CONFIG_WPS */ 924 925#ifdef CONFIG_P2P 926 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) { 927 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie), 928 wpabuf_len(hapd->p2p_beacon_ie)); 929 tailpos += wpabuf_len(hapd->p2p_beacon_ie); 930 } 931#endif /* CONFIG_P2P */ 932#ifdef CONFIG_P2P_MANAGER 933 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 934 P2P_MANAGE) 935 tailpos = hostapd_eid_p2p_manage(hapd, tailpos); 936#endif /* CONFIG_P2P_MANAGER */ 937 938#ifdef CONFIG_HS20 939 tailpos = hostapd_eid_hs20_indication(hapd, tailpos); 940 tailpos = hostapd_eid_osen(hapd, tailpos); 941#endif /* CONFIG_HS20 */ 942 943 if (hapd->conf->vendor_elements) { 944 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements), 945 wpabuf_len(hapd->conf->vendor_elements)); 946 tailpos += wpabuf_len(hapd->conf->vendor_elements); 947 } 948 949 tail_len = tailpos > tail ? tailpos - tail : 0; 950 951 resp = hostapd_probe_resp_offloads(hapd, &resp_len); 952#endif /* NEED_AP_MLME */ 953 954 os_memset(params, 0, sizeof(*params)); 955 params->head = (u8 *) head; 956 params->head_len = head_len; 957 params->tail = tail; 958 params->tail_len = tail_len; 959 params->proberesp = resp; 960 params->proberesp_len = resp_len; 961 params->dtim_period = hapd->conf->dtim_period; 962 params->beacon_int = hapd->iconf->beacon_int; 963 params->basic_rates = hapd->iface->basic_rates; 964 params->ssid = hapd->conf->ssid.ssid; 965 params->ssid_len = hapd->conf->ssid.ssid_len; 966 params->pairwise_ciphers = hapd->conf->wpa_pairwise | 967 hapd->conf->rsn_pairwise; 968 params->group_cipher = hapd->conf->wpa_group; 969 params->key_mgmt_suites = hapd->conf->wpa_key_mgmt; 970 params->auth_algs = hapd->conf->auth_algs; 971 params->wpa_version = hapd->conf->wpa; 972 params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa || 973 (hapd->conf->ieee802_1x && 974 (hapd->conf->default_wep_key_len || 975 hapd->conf->individual_wep_key_len)); 976 switch (hapd->conf->ignore_broadcast_ssid) { 977 case 0: 978 params->hide_ssid = NO_SSID_HIDING; 979 break; 980 case 1: 981 params->hide_ssid = HIDDEN_SSID_ZERO_LEN; 982 break; 983 case 2: 984 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS; 985 break; 986 } 987 params->isolate = hapd->conf->isolate; 988 params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK; 989#ifdef NEED_AP_MLME 990 params->cts_protect = !!(ieee802_11_erp_info(hapd) & 991 ERP_INFO_USE_PROTECTION); 992 params->preamble = hapd->iface->num_sta_no_short_preamble == 0 && 993 hapd->iconf->preamble == SHORT_PREAMBLE; 994 if (hapd->iface->current_mode && 995 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 996 params->short_slot_time = 997 hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1; 998 else 999 params->short_slot_time = -1; 1000 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) 1001 params->ht_opmode = -1; 1002 else 1003 params->ht_opmode = hapd->iface->ht_op_mode; 1004#endif /* NEED_AP_MLME */ 1005 params->interworking = hapd->conf->interworking; 1006 if (hapd->conf->interworking && 1007 !is_zero_ether_addr(hapd->conf->hessid)) 1008 params->hessid = hapd->conf->hessid; 1009 params->access_network_type = hapd->conf->access_network_type; 1010 params->ap_max_inactivity = hapd->conf->ap_max_inactivity; 1011#ifdef CONFIG_P2P 1012 params->p2p_go_ctwindow = hapd->iconf->p2p_go_ctwindow; 1013#endif /* CONFIG_P2P */ 1014#ifdef CONFIG_HS20 1015 params->disable_dgaf = hapd->conf->disable_dgaf; 1016 if (hapd->conf->osen) { 1017 params->privacy = 1; 1018 params->osen = 1; 1019 } 1020#endif /* CONFIG_HS20 */ 1021 return 0; 1022} 1023 1024 1025void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params) 1026{ 1027 os_free(params->tail); 1028 params->tail = NULL; 1029 os_free(params->head); 1030 params->head = NULL; 1031 os_free(params->proberesp); 1032 params->proberesp = NULL; 1033} 1034 1035 1036int ieee802_11_set_beacon(struct hostapd_data *hapd) 1037{ 1038 struct wpa_driver_ap_params params; 1039 struct hostapd_freq_params freq; 1040 struct hostapd_iface *iface = hapd->iface; 1041 struct hostapd_config *iconf = iface->conf; 1042 struct wpabuf *beacon, *proberesp, *assocresp; 1043 int res, ret = -1; 1044 1045 if (hapd->csa_in_progress) { 1046 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period"); 1047 return -1; 1048 } 1049 1050 hapd->beacon_set_done = 1; 1051 1052 if (ieee802_11_build_ap_params(hapd, ¶ms) < 0) 1053 return -1; 1054 1055 if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) < 1056 0) 1057 goto fail; 1058 1059 params.beacon_ies = beacon; 1060 params.proberesp_ies = proberesp; 1061 params.assocresp_ies = assocresp; 1062 params.reenable = hapd->reenable_beacon; 1063 hapd->reenable_beacon = 0; 1064 1065 if (iface->current_mode && 1066 hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq, 1067 iconf->channel, iconf->ieee80211n, 1068 iconf->ieee80211ac, 1069 iconf->secondary_channel, 1070 iconf->vht_oper_chwidth, 1071 iconf->vht_oper_centr_freq_seg0_idx, 1072 iconf->vht_oper_centr_freq_seg1_idx, 1073 iface->current_mode->vht_capab) == 0) 1074 params.freq = &freq; 1075 1076 res = hostapd_drv_set_ap(hapd, ¶ms); 1077 hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp); 1078 if (res) 1079 wpa_printf(MSG_ERROR, "Failed to set beacon parameters"); 1080 else 1081 ret = 0; 1082fail: 1083 ieee802_11_free_ap_params(¶ms); 1084 return ret; 1085} 1086 1087 1088int ieee802_11_set_beacons(struct hostapd_iface *iface) 1089{ 1090 size_t i; 1091 int ret = 0; 1092 1093 for (i = 0; i < iface->num_bss; i++) { 1094 if (iface->bss[i]->started && 1095 ieee802_11_set_beacon(iface->bss[i]) < 0) 1096 ret = -1; 1097 } 1098 1099 return ret; 1100} 1101 1102 1103/* only update beacons if started */ 1104int ieee802_11_update_beacons(struct hostapd_iface *iface) 1105{ 1106 size_t i; 1107 int ret = 0; 1108 1109 for (i = 0; i < iface->num_bss; i++) { 1110 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started && 1111 ieee802_11_set_beacon(iface->bss[i]) < 0) 1112 ret = -1; 1113 } 1114 1115 return ret; 1116} 1117 1118#endif /* CONFIG_NATIVE_WINDOWS */ 1119