beacon.c revision 2f74e36e84064ffa32f82f3decf36b653c7e4fad
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_rm_enabled_capab(struct hostapd_data *hapd, u8 *eid, 36 size_t len) 37{ 38 if (!hapd->conf->radio_measurements || len < 2 + 4) 39 return eid; 40 41 *eid++ = WLAN_EID_RRM_ENABLED_CAPABILITIES; 42 *eid++ = 5; 43 *eid++ = (hapd->conf->radio_measurements & BIT(0)) ? 44 WLAN_RRM_CAPS_NEIGHBOR_REPORT : 0x00; 45 *eid++ = 0x00; 46 *eid++ = 0x00; 47 *eid++ = 0x00; 48 *eid++ = 0x00; 49 return eid; 50} 51 52 53static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len) 54{ 55 if (len < 2 + 5) 56 return eid; 57 58#ifdef CONFIG_TESTING_OPTIONS 59 if (hapd->conf->bss_load_test_set) { 60 *eid++ = WLAN_EID_BSS_LOAD; 61 *eid++ = 5; 62 os_memcpy(eid, hapd->conf->bss_load_test, 5); 63 eid += 5; 64 return eid; 65 } 66#endif /* CONFIG_TESTING_OPTIONS */ 67 if (hapd->conf->bss_load_update_period) { 68 *eid++ = WLAN_EID_BSS_LOAD; 69 *eid++ = 5; 70 WPA_PUT_LE16(eid, hapd->num_sta); 71 eid += 2; 72 *eid++ = hapd->iface->channel_utilization; 73 WPA_PUT_LE16(eid, 0); /* no available admission capabity */ 74 eid += 2; 75 } 76 return eid; 77} 78 79 80static u8 ieee802_11_erp_info(struct hostapd_data *hapd) 81{ 82 u8 erp = 0; 83 84 if (hapd->iface->current_mode == NULL || 85 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 86 return 0; 87 88 if (hapd->iface->olbc) 89 erp |= ERP_INFO_USE_PROTECTION; 90 if (hapd->iface->num_sta_non_erp > 0) { 91 erp |= ERP_INFO_NON_ERP_PRESENT | 92 ERP_INFO_USE_PROTECTION; 93 } 94 if (hapd->iface->num_sta_no_short_preamble > 0 || 95 hapd->iconf->preamble == LONG_PREAMBLE) 96 erp |= ERP_INFO_BARKER_PREAMBLE_MODE; 97 98 return erp; 99} 100 101 102static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid) 103{ 104 *eid++ = WLAN_EID_DS_PARAMS; 105 *eid++ = 1; 106 *eid++ = hapd->iconf->channel; 107 return eid; 108} 109 110 111static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid) 112{ 113 if (hapd->iface->current_mode == NULL || 114 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 115 return eid; 116 117 /* Set NonERP_present and use_protection bits if there 118 * are any associated NonERP stations. */ 119 /* TODO: use_protection bit can be set to zero even if 120 * there are NonERP stations present. This optimization 121 * might be useful if NonERP stations are "quiet". 122 * See 802.11g/D6 E-1 for recommended practice. 123 * In addition, Non ERP present might be set, if AP detects Non ERP 124 * operation on other APs. */ 125 126 /* Add ERP Information element */ 127 *eid++ = WLAN_EID_ERP_INFO; 128 *eid++ = 1; 129 *eid++ = ieee802_11_erp_info(hapd); 130 131 return eid; 132} 133 134 135static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid) 136{ 137 u8 *pos = eid; 138 u8 local_pwr_constraint = 0; 139 int dfs; 140 141 if (hapd->iface->current_mode == NULL || 142 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) 143 return eid; 144 145 /* Let host drivers add this IE if DFS support is offloaded */ 146 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) 147 return eid; 148 149 /* 150 * There is no DFS support and power constraint was not directly 151 * requested by config option. 152 */ 153 if (!hapd->iconf->ieee80211h && 154 hapd->iconf->local_pwr_constraint == -1) 155 return eid; 156 157 /* Check if DFS is required by regulatory. */ 158 dfs = hostapd_is_dfs_required(hapd->iface); 159 if (dfs < 0) { 160 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d", 161 dfs); 162 dfs = 0; 163 } 164 165 if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1) 166 return eid; 167 168 /* 169 * ieee80211h (DFS) is enabled so Power Constraint element shall 170 * be added when running on DFS channel whenever local_pwr_constraint 171 * is configured or not. In order to meet regulations when TPC is not 172 * implemented using a transmit power that is below the legal maximum 173 * (including any mitigation factor) should help. In this case, 174 * indicate 3 dB below maximum allowed transmit power. 175 */ 176 if (hapd->iconf->local_pwr_constraint == -1) 177 local_pwr_constraint = 3; 178 179 /* 180 * A STA that is not an AP shall use a transmit power less than or 181 * equal to the local maximum transmit power level for the channel. 182 * The local maximum transmit power can be calculated from the formula: 183 * local max TX pwr = max TX pwr - local pwr constraint 184 * Where max TX pwr is maximum transmit power level specified for 185 * channel in Country element and local pwr constraint is specified 186 * for channel in this Power Constraint element. 187 */ 188 189 /* Element ID */ 190 *pos++ = WLAN_EID_PWR_CONSTRAINT; 191 /* Length */ 192 *pos++ = 1; 193 /* Local Power Constraint */ 194 if (local_pwr_constraint) 195 *pos++ = local_pwr_constraint; 196 else 197 *pos++ = hapd->iconf->local_pwr_constraint; 198 199 return pos; 200} 201 202 203static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing, 204 struct hostapd_channel_data *start, 205 struct hostapd_channel_data *prev) 206{ 207 if (end - pos < 3) 208 return pos; 209 210 /* first channel number */ 211 *pos++ = start->chan; 212 /* number of channels */ 213 *pos++ = (prev->chan - start->chan) / chan_spacing + 1; 214 /* maximum transmit power level */ 215 *pos++ = start->max_tx_power; 216 217 return pos; 218} 219 220 221static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid, 222 int max_len) 223{ 224 u8 *pos = eid; 225 u8 *end = eid + max_len; 226 int i; 227 struct hostapd_hw_modes *mode; 228 struct hostapd_channel_data *start, *prev; 229 int chan_spacing = 1; 230 231 if (!hapd->iconf->ieee80211d || max_len < 6 || 232 hapd->iface->current_mode == NULL) 233 return eid; 234 235 *pos++ = WLAN_EID_COUNTRY; 236 pos++; /* length will be set later */ 237 os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */ 238 pos += 3; 239 240 mode = hapd->iface->current_mode; 241 if (mode->mode == HOSTAPD_MODE_IEEE80211A) 242 chan_spacing = 4; 243 244 start = prev = NULL; 245 for (i = 0; i < mode->num_channels; i++) { 246 struct hostapd_channel_data *chan = &mode->channels[i]; 247 if (chan->flag & HOSTAPD_CHAN_DISABLED) 248 continue; 249 if (start && prev && 250 prev->chan + chan_spacing == chan->chan && 251 start->max_tx_power == chan->max_tx_power) { 252 prev = chan; 253 continue; /* can use same entry */ 254 } 255 256 if (start && prev) { 257 pos = hostapd_eid_country_add(pos, end, chan_spacing, 258 start, prev); 259 start = NULL; 260 } 261 262 /* Start new group */ 263 start = prev = chan; 264 } 265 266 if (start) { 267 pos = hostapd_eid_country_add(pos, end, chan_spacing, 268 start, prev); 269 } 270 271 if ((pos - eid) & 1) { 272 if (end - pos < 1) 273 return eid; 274 *pos++ = 0; /* pad for 16-bit alignment */ 275 } 276 277 eid[1] = (pos - eid) - 2; 278 279 return pos; 280} 281 282 283static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len) 284{ 285 const u8 *ie; 286 size_t ielen; 287 288 ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen); 289 if (ie == NULL || ielen > len) 290 return eid; 291 292 os_memcpy(eid, ie, ielen); 293 return eid + ielen; 294} 295 296 297static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid) 298{ 299 u8 chan; 300 301 if (!hapd->cs_freq_params.freq) 302 return eid; 303 304 if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) == 305 NUM_HOSTAPD_MODES) 306 return eid; 307 308 *eid++ = WLAN_EID_CHANNEL_SWITCH; 309 *eid++ = 3; 310 *eid++ = hapd->cs_block_tx; 311 *eid++ = chan; 312 *eid++ = hapd->cs_count; 313 314 return eid; 315} 316 317 318static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid) 319{ 320 u8 sec_ch; 321 322 if (!hapd->cs_freq_params.sec_channel_offset) 323 return eid; 324 325 if (hapd->cs_freq_params.sec_channel_offset == -1) 326 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW; 327 else if (hapd->cs_freq_params.sec_channel_offset == 1) 328 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE; 329 else 330 return eid; 331 332 *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 333 *eid++ = 1; 334 *eid++ = sec_ch; 335 336 return eid; 337} 338 339 340static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos, 341 u8 *start, unsigned int *csa_counter_off) 342{ 343 u8 *old_pos = pos; 344 345 if (!csa_counter_off) 346 return pos; 347 348 *csa_counter_off = 0; 349 pos = hostapd_eid_csa(hapd, pos); 350 351 if (pos != old_pos) { 352 /* save an offset to the counter - should be last byte */ 353 *csa_counter_off = pos - start - 1; 354 pos = hostapd_eid_secondary_channel(hapd, pos); 355 } 356 357 return pos; 358} 359 360 361static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd, 362 struct sta_info *sta, 363 const struct ieee80211_mgmt *req, 364 int is_p2p, size_t *resp_len) 365{ 366 struct ieee80211_mgmt *resp; 367 u8 *pos, *epos; 368 size_t buflen; 369 370#define MAX_PROBERESP_LEN 768 371 buflen = MAX_PROBERESP_LEN; 372#ifdef CONFIG_WPS 373 if (hapd->wps_probe_resp_ie) 374 buflen += wpabuf_len(hapd->wps_probe_resp_ie); 375#endif /* CONFIG_WPS */ 376#ifdef CONFIG_P2P 377 if (hapd->p2p_probe_resp_ie) 378 buflen += wpabuf_len(hapd->p2p_probe_resp_ie); 379#endif /* CONFIG_P2P */ 380 if (hapd->conf->vendor_elements) 381 buflen += wpabuf_len(hapd->conf->vendor_elements); 382 if (hapd->conf->vendor_vht) { 383 buflen += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) + 384 2 + sizeof(struct ieee80211_vht_operation); 385 } 386 resp = os_zalloc(buflen); 387 if (resp == NULL) 388 return NULL; 389 390 epos = ((u8 *) resp) + MAX_PROBERESP_LEN; 391 392 resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 393 WLAN_FC_STYPE_PROBE_RESP); 394 if (req) 395 os_memcpy(resp->da, req->sa, ETH_ALEN); 396 os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN); 397 398 os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN); 399 resp->u.probe_resp.beacon_int = 400 host_to_le16(hapd->iconf->beacon_int); 401 402 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 403 resp->u.probe_resp.capab_info = 404 host_to_le16(hostapd_own_capab_info(hapd, sta, 1)); 405 406 pos = resp->u.probe_resp.variable; 407 *pos++ = WLAN_EID_SSID; 408 *pos++ = hapd->conf->ssid.ssid_len; 409 os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len); 410 pos += hapd->conf->ssid.ssid_len; 411 412 /* Supported rates */ 413 pos = hostapd_eid_supp_rates(hapd, pos); 414 415 /* DS Params */ 416 pos = hostapd_eid_ds_params(hapd, pos); 417 418 pos = hostapd_eid_country(hapd, pos, epos - pos); 419 420 /* Power Constraint element */ 421 pos = hostapd_eid_pwr_constraint(hapd, pos); 422 423 /* ERP Information element */ 424 pos = hostapd_eid_erp_info(hapd, pos); 425 426 /* Extended supported rates */ 427 pos = hostapd_eid_ext_supp_rates(hapd, pos); 428 429 /* RSN, MDIE, WPA */ 430 pos = hostapd_eid_wpa(hapd, pos, epos - pos); 431 432 pos = hostapd_eid_bss_load(hapd, pos, epos - pos); 433 434 pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos); 435 436#ifdef CONFIG_IEEE80211N 437 pos = hostapd_eid_ht_capabilities(hapd, pos); 438 pos = hostapd_eid_ht_operation(hapd, pos); 439#endif /* CONFIG_IEEE80211N */ 440 441 pos = hostapd_eid_ext_capab(hapd, pos); 442 443 pos = hostapd_eid_time_adv(hapd, pos); 444 pos = hostapd_eid_time_zone(hapd, pos); 445 446 pos = hostapd_eid_interworking(hapd, pos); 447 pos = hostapd_eid_adv_proto(hapd, pos); 448 pos = hostapd_eid_roaming_consortium(hapd, pos); 449 450 pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp, 451 &hapd->cs_c_off_proberesp); 452#ifdef CONFIG_IEEE80211AC 453 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) { 454 pos = hostapd_eid_vht_capabilities(hapd, pos); 455 pos = hostapd_eid_vht_operation(hapd, pos); 456 } 457 if (hapd->conf->vendor_vht) 458 pos = hostapd_eid_vendor_vht(hapd, pos); 459#endif /* CONFIG_IEEE80211AC */ 460 461 /* Wi-Fi Alliance WMM */ 462 pos = hostapd_eid_wmm(hapd, pos); 463 464#ifdef CONFIG_WPS 465 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) { 466 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie), 467 wpabuf_len(hapd->wps_probe_resp_ie)); 468 pos += wpabuf_len(hapd->wps_probe_resp_ie); 469 } 470#endif /* CONFIG_WPS */ 471 472#ifdef CONFIG_P2P 473 if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p && 474 hapd->p2p_probe_resp_ie) { 475 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie), 476 wpabuf_len(hapd->p2p_probe_resp_ie)); 477 pos += wpabuf_len(hapd->p2p_probe_resp_ie); 478 } 479#endif /* CONFIG_P2P */ 480#ifdef CONFIG_P2P_MANAGER 481 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 482 P2P_MANAGE) 483 pos = hostapd_eid_p2p_manage(hapd, pos); 484#endif /* CONFIG_P2P_MANAGER */ 485 486#ifdef CONFIG_HS20 487 pos = hostapd_eid_hs20_indication(hapd, pos); 488 pos = hostapd_eid_osen(hapd, pos); 489#endif /* CONFIG_HS20 */ 490 491 if (hapd->conf->vendor_elements) { 492 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements), 493 wpabuf_len(hapd->conf->vendor_elements)); 494 pos += wpabuf_len(hapd->conf->vendor_elements); 495 } 496 497 *resp_len = pos - (u8 *) resp; 498 return (u8 *) resp; 499} 500 501 502enum ssid_match_result { 503 NO_SSID_MATCH, 504 EXACT_SSID_MATCH, 505 WILDCARD_SSID_MATCH 506}; 507 508static enum ssid_match_result ssid_match(struct hostapd_data *hapd, 509 const u8 *ssid, size_t ssid_len, 510 const u8 *ssid_list, 511 size_t ssid_list_len) 512{ 513 const u8 *pos, *end; 514 int wildcard = 0; 515 516 if (ssid_len == 0) 517 wildcard = 1; 518 if (ssid_len == hapd->conf->ssid.ssid_len && 519 os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0) 520 return EXACT_SSID_MATCH; 521 522 if (ssid_list == NULL) 523 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 524 525 pos = ssid_list; 526 end = ssid_list + ssid_list_len; 527 while (pos + 1 <= end) { 528 if (pos + 2 + pos[1] > end) 529 break; 530 if (pos[1] == 0) 531 wildcard = 1; 532 if (pos[1] == hapd->conf->ssid.ssid_len && 533 os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0) 534 return EXACT_SSID_MATCH; 535 pos += 2 + pos[1]; 536 } 537 538 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 539} 540 541 542void handle_probe_req(struct hostapd_data *hapd, 543 const struct ieee80211_mgmt *mgmt, size_t len, 544 int ssi_signal) 545{ 546 u8 *resp; 547 struct ieee802_11_elems elems; 548 const u8 *ie; 549 size_t ie_len; 550 struct sta_info *sta = NULL; 551 size_t i, resp_len; 552 int noack; 553 enum ssid_match_result res; 554 555 ie = mgmt->u.probe_req.variable; 556 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)) 557 return; 558 ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)); 559 560 for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++) 561 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx, 562 mgmt->sa, mgmt->da, mgmt->bssid, 563 ie, ie_len, ssi_signal) > 0) 564 return; 565 566 if (!hapd->iconf->send_probe_response) 567 return; 568 569 if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) { 570 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR, 571 MAC2STR(mgmt->sa)); 572 return; 573 } 574 575 if ((!elems.ssid || !elems.supp_rates)) { 576 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request " 577 "without SSID or supported rates element", 578 MAC2STR(mgmt->sa)); 579 return; 580 } 581 582#ifdef CONFIG_P2P 583 if (hapd->p2p && elems.wps_ie) { 584 struct wpabuf *wps; 585 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA); 586 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) { 587 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 588 "due to mismatch with Requested Device " 589 "Type"); 590 wpabuf_free(wps); 591 return; 592 } 593 wpabuf_free(wps); 594 } 595 596 if (hapd->p2p && elems.p2p) { 597 struct wpabuf *p2p; 598 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE); 599 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) { 600 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 601 "due to mismatch with Device ID"); 602 wpabuf_free(p2p); 603 return; 604 } 605 wpabuf_free(p2p); 606 } 607#endif /* CONFIG_P2P */ 608 609 if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 && 610 elems.ssid_list_len == 0) { 611 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for " 612 "broadcast SSID ignored", MAC2STR(mgmt->sa)); 613 return; 614 } 615 616 sta = ap_get_sta(hapd, mgmt->sa); 617 618#ifdef CONFIG_P2P 619 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 620 elems.ssid_len == P2P_WILDCARD_SSID_LEN && 621 os_memcmp(elems.ssid, P2P_WILDCARD_SSID, 622 P2P_WILDCARD_SSID_LEN) == 0) { 623 /* Process P2P Wildcard SSID like Wildcard SSID */ 624 elems.ssid_len = 0; 625 } 626#endif /* CONFIG_P2P */ 627 628 res = ssid_match(hapd, elems.ssid, elems.ssid_len, 629 elems.ssid_list, elems.ssid_list_len); 630 if (res != NO_SSID_MATCH) { 631 if (sta) 632 sta->ssid_probe = &hapd->conf->ssid; 633 } else { 634 if (!(mgmt->da[0] & 0x01)) { 635 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 636 " for foreign SSID '%s' (DA " MACSTR ")%s", 637 MAC2STR(mgmt->sa), 638 wpa_ssid_txt(elems.ssid, elems.ssid_len), 639 MAC2STR(mgmt->da), 640 elems.ssid_list ? " (SSID list)" : ""); 641 } 642 return; 643 } 644 645#ifdef CONFIG_INTERWORKING 646 if (hapd->conf->interworking && 647 elems.interworking && elems.interworking_len >= 1) { 648 u8 ant = elems.interworking[0] & 0x0f; 649 if (ant != INTERWORKING_ANT_WILDCARD && 650 ant != hapd->conf->access_network_type) { 651 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 652 " for mismatching ANT %u ignored", 653 MAC2STR(mgmt->sa), ant); 654 return; 655 } 656 } 657 658 if (hapd->conf->interworking && elems.interworking && 659 (elems.interworking_len == 7 || elems.interworking_len == 9)) { 660 const u8 *hessid; 661 if (elems.interworking_len == 7) 662 hessid = elems.interworking + 1; 663 else 664 hessid = elems.interworking + 1 + 2; 665 if (!is_broadcast_ether_addr(hessid) && 666 os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) { 667 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 668 " for mismatching HESSID " MACSTR 669 " ignored", 670 MAC2STR(mgmt->sa), MAC2STR(hessid)); 671 return; 672 } 673 } 674#endif /* CONFIG_INTERWORKING */ 675 676#ifdef CONFIG_P2P 677 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 678 supp_rates_11b_only(&elems)) { 679 /* Indicates support for 11b rates only */ 680 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from " 681 MACSTR " with only 802.11b rates", 682 MAC2STR(mgmt->sa)); 683 return; 684 } 685#endif /* CONFIG_P2P */ 686 687 /* TODO: verify that supp_rates contains at least one matching rate 688 * with AP configuration */ 689 690#ifdef CONFIG_TESTING_OPTIONS 691 if (hapd->iconf->ignore_probe_probability > 0.0 && 692 drand48() < hapd->iconf->ignore_probe_probability) { 693 wpa_printf(MSG_INFO, 694 "TESTING: ignoring probe request from " MACSTR, 695 MAC2STR(mgmt->sa)); 696 return; 697 } 698#endif /* CONFIG_TESTING_OPTIONS */ 699 700 resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL, 701 &resp_len); 702 if (resp == NULL) 703 return; 704 705 /* 706 * If this is a broadcast probe request, apply no ack policy to avoid 707 * excessive retries. 708 */ 709 noack = !!(res == WILDCARD_SSID_MATCH && 710 is_broadcast_ether_addr(mgmt->da)); 711 712 if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0) 713 wpa_printf(MSG_INFO, "handle_probe_req: send failed"); 714 715 os_free(resp); 716 717 wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s " 718 "SSID", MAC2STR(mgmt->sa), 719 elems.ssid_len == 0 ? "broadcast" : "our"); 720} 721 722 723static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd, 724 size_t *resp_len) 725{ 726 /* check probe response offloading caps and print warnings */ 727 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD)) 728 return NULL; 729 730#ifdef CONFIG_WPS 731 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie && 732 (!(hapd->iface->probe_resp_offloads & 733 (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS | 734 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2)))) 735 wpa_printf(MSG_WARNING, "Device is trying to offload WPS " 736 "Probe Response while not supporting this"); 737#endif /* CONFIG_WPS */ 738 739#ifdef CONFIG_P2P 740 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie && 741 !(hapd->iface->probe_resp_offloads & 742 WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P)) 743 wpa_printf(MSG_WARNING, "Device is trying to offload P2P " 744 "Probe Response while not supporting this"); 745#endif /* CONFIG_P2P */ 746 747 if (hapd->conf->interworking && 748 !(hapd->iface->probe_resp_offloads & 749 WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING)) 750 wpa_printf(MSG_WARNING, "Device is trying to offload " 751 "Interworking Probe Response while not supporting " 752 "this"); 753 754 /* Generate a Probe Response template for the non-P2P case */ 755 return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len); 756} 757 758#endif /* NEED_AP_MLME */ 759 760 761int ieee802_11_build_ap_params(struct hostapd_data *hapd, 762 struct wpa_driver_ap_params *params) 763{ 764 struct ieee80211_mgmt *head = NULL; 765 u8 *tail = NULL; 766 size_t head_len = 0, tail_len = 0; 767 u8 *resp = NULL; 768 size_t resp_len = 0; 769#ifdef NEED_AP_MLME 770 u16 capab_info; 771 u8 *pos, *tailpos; 772 773#define BEACON_HEAD_BUF_SIZE 256 774#define BEACON_TAIL_BUF_SIZE 512 775 head = os_zalloc(BEACON_HEAD_BUF_SIZE); 776 tail_len = BEACON_TAIL_BUF_SIZE; 777#ifdef CONFIG_WPS 778 if (hapd->conf->wps_state && hapd->wps_beacon_ie) 779 tail_len += wpabuf_len(hapd->wps_beacon_ie); 780#endif /* CONFIG_WPS */ 781#ifdef CONFIG_P2P 782 if (hapd->p2p_beacon_ie) 783 tail_len += wpabuf_len(hapd->p2p_beacon_ie); 784#endif /* CONFIG_P2P */ 785 if (hapd->conf->vendor_elements) 786 tail_len += wpabuf_len(hapd->conf->vendor_elements); 787 788#ifdef CONFIG_IEEE80211AC 789 if (hapd->conf->vendor_vht) { 790 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) + 791 2 + sizeof(struct ieee80211_vht_operation); 792 } 793#endif /* CONFIG_IEEE80211AC */ 794 795 tailpos = tail = os_malloc(tail_len); 796 if (head == NULL || tail == NULL) { 797 wpa_printf(MSG_ERROR, "Failed to set beacon data"); 798 os_free(head); 799 os_free(tail); 800 return -1; 801 } 802 803 head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 804 WLAN_FC_STYPE_BEACON); 805 head->duration = host_to_le16(0); 806 os_memset(head->da, 0xff, ETH_ALEN); 807 808 os_memcpy(head->sa, hapd->own_addr, ETH_ALEN); 809 os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN); 810 head->u.beacon.beacon_int = 811 host_to_le16(hapd->iconf->beacon_int); 812 813 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 814 capab_info = hostapd_own_capab_info(hapd, NULL, 0); 815 head->u.beacon.capab_info = host_to_le16(capab_info); 816 pos = &head->u.beacon.variable[0]; 817 818 /* SSID */ 819 *pos++ = WLAN_EID_SSID; 820 if (hapd->conf->ignore_broadcast_ssid == 2) { 821 /* clear the data, but keep the correct length of the SSID */ 822 *pos++ = hapd->conf->ssid.ssid_len; 823 os_memset(pos, 0, hapd->conf->ssid.ssid_len); 824 pos += hapd->conf->ssid.ssid_len; 825 } else if (hapd->conf->ignore_broadcast_ssid) { 826 *pos++ = 0; /* empty SSID */ 827 } else { 828 *pos++ = hapd->conf->ssid.ssid_len; 829 os_memcpy(pos, hapd->conf->ssid.ssid, 830 hapd->conf->ssid.ssid_len); 831 pos += hapd->conf->ssid.ssid_len; 832 } 833 834 /* Supported rates */ 835 pos = hostapd_eid_supp_rates(hapd, pos); 836 837 /* DS Params */ 838 pos = hostapd_eid_ds_params(hapd, pos); 839 840 head_len = pos - (u8 *) head; 841 842 tailpos = hostapd_eid_country(hapd, tailpos, 843 tail + BEACON_TAIL_BUF_SIZE - tailpos); 844 845 /* Power Constraint element */ 846 tailpos = hostapd_eid_pwr_constraint(hapd, tailpos); 847 848 /* ERP Information element */ 849 tailpos = hostapd_eid_erp_info(hapd, tailpos); 850 851 /* Extended supported rates */ 852 tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos); 853 854 /* RSN, MDIE, WPA */ 855 tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - 856 tailpos); 857 858 tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos, 859 tail + BEACON_TAIL_BUF_SIZE - 860 tailpos); 861 862 tailpos = hostapd_eid_bss_load(hapd, tailpos, 863 tail + BEACON_TAIL_BUF_SIZE - tailpos); 864 865#ifdef CONFIG_IEEE80211N 866 tailpos = hostapd_eid_ht_capabilities(hapd, tailpos); 867 tailpos = hostapd_eid_ht_operation(hapd, tailpos); 868#endif /* CONFIG_IEEE80211N */ 869 870 tailpos = hostapd_eid_ext_capab(hapd, tailpos); 871 872 /* 873 * TODO: Time Advertisement element should only be included in some 874 * DTIM Beacon frames. 875 */ 876 tailpos = hostapd_eid_time_adv(hapd, tailpos); 877 878 tailpos = hostapd_eid_interworking(hapd, tailpos); 879 tailpos = hostapd_eid_adv_proto(hapd, tailpos); 880 tailpos = hostapd_eid_roaming_consortium(hapd, tailpos); 881 tailpos = hostapd_add_csa_elems(hapd, tailpos, tail, 882 &hapd->cs_c_off_beacon); 883#ifdef CONFIG_IEEE80211AC 884 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) { 885 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos); 886 tailpos = hostapd_eid_vht_operation(hapd, tailpos); 887 } 888 if (hapd->conf->vendor_vht) 889 tailpos = hostapd_eid_vendor_vht(hapd, tailpos); 890#endif /* CONFIG_IEEE80211AC */ 891 892 /* Wi-Fi Alliance WMM */ 893 tailpos = hostapd_eid_wmm(hapd, tailpos); 894 895#ifdef CONFIG_WPS 896 if (hapd->conf->wps_state && hapd->wps_beacon_ie) { 897 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie), 898 wpabuf_len(hapd->wps_beacon_ie)); 899 tailpos += wpabuf_len(hapd->wps_beacon_ie); 900 } 901#endif /* CONFIG_WPS */ 902 903#ifdef CONFIG_P2P 904 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) { 905 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie), 906 wpabuf_len(hapd->p2p_beacon_ie)); 907 tailpos += wpabuf_len(hapd->p2p_beacon_ie); 908 } 909#endif /* CONFIG_P2P */ 910#ifdef CONFIG_P2P_MANAGER 911 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 912 P2P_MANAGE) 913 tailpos = hostapd_eid_p2p_manage(hapd, tailpos); 914#endif /* CONFIG_P2P_MANAGER */ 915 916#ifdef CONFIG_HS20 917 tailpos = hostapd_eid_hs20_indication(hapd, tailpos); 918 tailpos = hostapd_eid_osen(hapd, tailpos); 919#endif /* CONFIG_HS20 */ 920 921 if (hapd->conf->vendor_elements) { 922 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements), 923 wpabuf_len(hapd->conf->vendor_elements)); 924 tailpos += wpabuf_len(hapd->conf->vendor_elements); 925 } 926 927 tail_len = tailpos > tail ? tailpos - tail : 0; 928 929 resp = hostapd_probe_resp_offloads(hapd, &resp_len); 930#endif /* NEED_AP_MLME */ 931 932 os_memset(params, 0, sizeof(*params)); 933 params->head = (u8 *) head; 934 params->head_len = head_len; 935 params->tail = tail; 936 params->tail_len = tail_len; 937 params->proberesp = resp; 938 params->proberesp_len = resp_len; 939 params->dtim_period = hapd->conf->dtim_period; 940 params->beacon_int = hapd->iconf->beacon_int; 941 params->basic_rates = hapd->iface->basic_rates; 942 params->ssid = hapd->conf->ssid.ssid; 943 params->ssid_len = hapd->conf->ssid.ssid_len; 944 params->pairwise_ciphers = hapd->conf->wpa_pairwise | 945 hapd->conf->rsn_pairwise; 946 params->group_cipher = hapd->conf->wpa_group; 947 params->key_mgmt_suites = hapd->conf->wpa_key_mgmt; 948 params->auth_algs = hapd->conf->auth_algs; 949 params->wpa_version = hapd->conf->wpa; 950 params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa || 951 (hapd->conf->ieee802_1x && 952 (hapd->conf->default_wep_key_len || 953 hapd->conf->individual_wep_key_len)); 954 switch (hapd->conf->ignore_broadcast_ssid) { 955 case 0: 956 params->hide_ssid = NO_SSID_HIDING; 957 break; 958 case 1: 959 params->hide_ssid = HIDDEN_SSID_ZERO_LEN; 960 break; 961 case 2: 962 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS; 963 break; 964 } 965 params->isolate = hapd->conf->isolate; 966 params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK; 967#ifdef NEED_AP_MLME 968 params->cts_protect = !!(ieee802_11_erp_info(hapd) & 969 ERP_INFO_USE_PROTECTION); 970 params->preamble = hapd->iface->num_sta_no_short_preamble == 0 && 971 hapd->iconf->preamble == SHORT_PREAMBLE; 972 if (hapd->iface->current_mode && 973 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 974 params->short_slot_time = 975 hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1; 976 else 977 params->short_slot_time = -1; 978 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) 979 params->ht_opmode = -1; 980 else 981 params->ht_opmode = hapd->iface->ht_op_mode; 982#endif /* NEED_AP_MLME */ 983 params->interworking = hapd->conf->interworking; 984 if (hapd->conf->interworking && 985 !is_zero_ether_addr(hapd->conf->hessid)) 986 params->hessid = hapd->conf->hessid; 987 params->access_network_type = hapd->conf->access_network_type; 988 params->ap_max_inactivity = hapd->conf->ap_max_inactivity; 989#ifdef CONFIG_HS20 990 params->disable_dgaf = hapd->conf->disable_dgaf; 991 if (hapd->conf->osen) { 992 params->privacy = 1; 993 params->osen = 1; 994 } 995#endif /* CONFIG_HS20 */ 996 return 0; 997} 998 999 1000void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params) 1001{ 1002 os_free(params->tail); 1003 params->tail = NULL; 1004 os_free(params->head); 1005 params->head = NULL; 1006 os_free(params->proberesp); 1007 params->proberesp = NULL; 1008} 1009 1010 1011int ieee802_11_set_beacon(struct hostapd_data *hapd) 1012{ 1013 struct wpa_driver_ap_params params; 1014 struct hostapd_freq_params freq; 1015 struct hostapd_iface *iface = hapd->iface; 1016 struct hostapd_config *iconf = iface->conf; 1017 struct wpabuf *beacon, *proberesp, *assocresp; 1018 int res, ret = -1; 1019 1020 if (hapd->csa_in_progress) { 1021 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period"); 1022 return -1; 1023 } 1024 1025 hapd->beacon_set_done = 1; 1026 1027 if (ieee802_11_build_ap_params(hapd, ¶ms) < 0) 1028 return -1; 1029 1030 if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) < 1031 0) 1032 goto fail; 1033 1034 params.beacon_ies = beacon; 1035 params.proberesp_ies = proberesp; 1036 params.assocresp_ies = assocresp; 1037 1038 if (iface->current_mode && 1039 hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq, 1040 iconf->channel, iconf->ieee80211n, 1041 iconf->ieee80211ac, 1042 iconf->secondary_channel, 1043 iconf->vht_oper_chwidth, 1044 iconf->vht_oper_centr_freq_seg0_idx, 1045 iconf->vht_oper_centr_freq_seg1_idx, 1046 iface->current_mode->vht_capab) == 0) 1047 params.freq = &freq; 1048 1049 res = hostapd_drv_set_ap(hapd, ¶ms); 1050 hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp); 1051 if (res) 1052 wpa_printf(MSG_ERROR, "Failed to set beacon parameters"); 1053 else 1054 ret = 0; 1055fail: 1056 ieee802_11_free_ap_params(¶ms); 1057 return ret; 1058} 1059 1060 1061int ieee802_11_set_beacons(struct hostapd_iface *iface) 1062{ 1063 size_t i; 1064 int ret = 0; 1065 1066 for (i = 0; i < iface->num_bss; i++) { 1067 if (iface->bss[i]->started && 1068 ieee802_11_set_beacon(iface->bss[i]) < 0) 1069 ret = -1; 1070 } 1071 1072 return ret; 1073} 1074 1075 1076/* only update beacons if started */ 1077int ieee802_11_update_beacons(struct hostapd_iface *iface) 1078{ 1079 size_t i; 1080 int ret = 0; 1081 1082 for (i = 0; i < iface->num_bss; i++) { 1083 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started && 1084 ieee802_11_set_beacon(iface->bss[i]) < 0) 1085 ret = -1; 1086 } 1087 1088 return ret; 1089} 1090 1091#endif /* CONFIG_NATIVE_WINDOWS */ 1092