beacon.c revision fb79edc9df1f20461e90e478363d207348213d35
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 31 32#ifdef NEED_AP_MLME 33 34static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len) 35{ 36#ifdef CONFIG_TESTING_OPTIONS 37 if (hapd->conf->bss_load_test_set) { 38 if (2 + 5 > len) 39 return eid; 40 *eid++ = WLAN_EID_BSS_LOAD; 41 *eid++ = 5; 42 os_memcpy(eid, hapd->conf->bss_load_test, 5); 43 eid += 5; 44 } 45#endif /* CONFIG_TESTING_OPTIONS */ 46 return eid; 47} 48 49 50static u8 ieee802_11_erp_info(struct hostapd_data *hapd) 51{ 52 u8 erp = 0; 53 54 if (hapd->iface->current_mode == NULL || 55 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 56 return 0; 57 58 if (hapd->iface->olbc) 59 erp |= ERP_INFO_USE_PROTECTION; 60 if (hapd->iface->num_sta_non_erp > 0) { 61 erp |= ERP_INFO_NON_ERP_PRESENT | 62 ERP_INFO_USE_PROTECTION; 63 } 64 if (hapd->iface->num_sta_no_short_preamble > 0 || 65 hapd->iconf->preamble == LONG_PREAMBLE) 66 erp |= ERP_INFO_BARKER_PREAMBLE_MODE; 67 68 return erp; 69} 70 71 72static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid) 73{ 74 *eid++ = WLAN_EID_DS_PARAMS; 75 *eid++ = 1; 76 *eid++ = hapd->iconf->channel; 77 return eid; 78} 79 80 81static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid) 82{ 83 if (hapd->iface->current_mode == NULL || 84 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 85 return eid; 86 87 /* Set NonERP_present and use_protection bits if there 88 * are any associated NonERP stations. */ 89 /* TODO: use_protection bit can be set to zero even if 90 * there are NonERP stations present. This optimization 91 * might be useful if NonERP stations are "quiet". 92 * See 802.11g/D6 E-1 for recommended practice. 93 * In addition, Non ERP present might be set, if AP detects Non ERP 94 * operation on other APs. */ 95 96 /* Add ERP Information element */ 97 *eid++ = WLAN_EID_ERP_INFO; 98 *eid++ = 1; 99 *eid++ = ieee802_11_erp_info(hapd); 100 101 return eid; 102} 103 104 105static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing, 106 struct hostapd_channel_data *start, 107 struct hostapd_channel_data *prev) 108{ 109 if (end - pos < 3) 110 return pos; 111 112 /* first channel number */ 113 *pos++ = start->chan; 114 /* number of channels */ 115 *pos++ = (prev->chan - start->chan) / chan_spacing + 1; 116 /* maximum transmit power level */ 117 *pos++ = start->max_tx_power; 118 119 return pos; 120} 121 122 123static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid, 124 int max_len) 125{ 126 u8 *pos = eid; 127 u8 *end = eid + max_len; 128 int i; 129 struct hostapd_hw_modes *mode; 130 struct hostapd_channel_data *start, *prev; 131 int chan_spacing = 1; 132 133 if (!hapd->iconf->ieee80211d || max_len < 6 || 134 hapd->iface->current_mode == NULL) 135 return eid; 136 137 *pos++ = WLAN_EID_COUNTRY; 138 pos++; /* length will be set later */ 139 os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */ 140 pos += 3; 141 142 mode = hapd->iface->current_mode; 143 if (mode->mode == HOSTAPD_MODE_IEEE80211A) 144 chan_spacing = 4; 145 146 start = prev = NULL; 147 for (i = 0; i < mode->num_channels; i++) { 148 struct hostapd_channel_data *chan = &mode->channels[i]; 149 if (chan->flag & HOSTAPD_CHAN_DISABLED) 150 continue; 151 if (start && prev && 152 prev->chan + chan_spacing == chan->chan && 153 start->max_tx_power == chan->max_tx_power) { 154 prev = chan; 155 continue; /* can use same entry */ 156 } 157 158 if (start) { 159 pos = hostapd_eid_country_add(pos, end, chan_spacing, 160 start, prev); 161 start = NULL; 162 } 163 164 /* Start new group */ 165 start = prev = chan; 166 } 167 168 if (start) { 169 pos = hostapd_eid_country_add(pos, end, chan_spacing, 170 start, prev); 171 } 172 173 if ((pos - eid) & 1) { 174 if (end - pos < 1) 175 return eid; 176 *pos++ = 0; /* pad for 16-bit alignment */ 177 } 178 179 eid[1] = (pos - eid) - 2; 180 181 return pos; 182} 183 184 185static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len) 186{ 187 const u8 *ie; 188 size_t ielen; 189 190 ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen); 191 if (ie == NULL || ielen > len) 192 return eid; 193 194 os_memcpy(eid, ie, ielen); 195 return eid + ielen; 196} 197 198 199static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid) 200{ 201 u8 chan; 202 203 if (!hapd->iface->cs_freq_params.freq) 204 return eid; 205 206 if (ieee80211_freq_to_chan(hapd->iface->cs_freq_params.freq, &chan) == 207 NUM_HOSTAPD_MODES) 208 return eid; 209 210 *eid++ = WLAN_EID_CHANNEL_SWITCH; 211 *eid++ = 3; 212 *eid++ = hapd->iface->cs_block_tx; 213 *eid++ = chan; 214 *eid++ = hapd->iface->cs_count; 215 216 return eid; 217} 218 219 220static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid) 221{ 222 u8 sec_ch; 223 224 if (!hapd->iface->cs_freq_params.sec_channel_offset) 225 return eid; 226 227 if (hapd->iface->cs_freq_params.sec_channel_offset == -1) 228 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW; 229 else if (hapd->iface->cs_freq_params.sec_channel_offset == 1) 230 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE; 231 else 232 return eid; 233 234 *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 235 *eid++ = 1; 236 *eid++ = sec_ch; 237 238 return eid; 239} 240 241 242static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos, 243 u8 *start, unsigned int *csa_counter_off) 244{ 245 u8 *old_pos = pos; 246 247 if (!csa_counter_off) 248 return pos; 249 250 *csa_counter_off = 0; 251 pos = hostapd_eid_csa(hapd, pos); 252 253 if (pos != old_pos) { 254 /* save an offset to the counter - should be last byte */ 255 *csa_counter_off = pos - start - 1; 256 pos = hostapd_eid_secondary_channel(hapd, pos); 257 } 258 259 return pos; 260} 261 262 263static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd, 264 struct sta_info *sta, 265 const struct ieee80211_mgmt *req, 266 int is_p2p, size_t *resp_len) 267{ 268 struct ieee80211_mgmt *resp; 269 u8 *pos, *epos; 270 size_t buflen; 271 272#define MAX_PROBERESP_LEN 768 273 buflen = MAX_PROBERESP_LEN; 274#ifdef CONFIG_WPS 275 if (hapd->wps_probe_resp_ie) 276 buflen += wpabuf_len(hapd->wps_probe_resp_ie); 277#endif /* CONFIG_WPS */ 278#ifdef CONFIG_P2P 279 if (hapd->p2p_probe_resp_ie) 280 buflen += wpabuf_len(hapd->p2p_probe_resp_ie); 281#endif /* CONFIG_P2P */ 282 if (hapd->conf->vendor_elements) 283 buflen += wpabuf_len(hapd->conf->vendor_elements); 284 resp = os_zalloc(buflen); 285 if (resp == NULL) 286 return NULL; 287 288 epos = ((u8 *) resp) + MAX_PROBERESP_LEN; 289 290 resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 291 WLAN_FC_STYPE_PROBE_RESP); 292 if (req) 293 os_memcpy(resp->da, req->sa, ETH_ALEN); 294 os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN); 295 296 os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN); 297 resp->u.probe_resp.beacon_int = 298 host_to_le16(hapd->iconf->beacon_int); 299 300 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 301 resp->u.probe_resp.capab_info = 302 host_to_le16(hostapd_own_capab_info(hapd, sta, 1)); 303 304 pos = resp->u.probe_resp.variable; 305 *pos++ = WLAN_EID_SSID; 306 *pos++ = hapd->conf->ssid.ssid_len; 307 os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len); 308 pos += hapd->conf->ssid.ssid_len; 309 310 /* Supported rates */ 311 pos = hostapd_eid_supp_rates(hapd, pos); 312 313 /* DS Params */ 314 pos = hostapd_eid_ds_params(hapd, pos); 315 316 pos = hostapd_eid_country(hapd, pos, epos - pos); 317 318 /* ERP Information element */ 319 pos = hostapd_eid_erp_info(hapd, pos); 320 321 /* Extended supported rates */ 322 pos = hostapd_eid_ext_supp_rates(hapd, pos); 323 324 /* RSN, MDIE, WPA */ 325 pos = hostapd_eid_wpa(hapd, pos, epos - pos); 326 327 pos = hostapd_eid_bss_load(hapd, pos, epos - pos); 328 329#ifdef CONFIG_IEEE80211N 330 pos = hostapd_eid_ht_capabilities(hapd, pos); 331 pos = hostapd_eid_ht_operation(hapd, pos); 332#endif /* CONFIG_IEEE80211N */ 333 334 pos = hostapd_eid_ext_capab(hapd, pos); 335 336 pos = hostapd_eid_time_adv(hapd, pos); 337 pos = hostapd_eid_time_zone(hapd, pos); 338 339 pos = hostapd_eid_interworking(hapd, pos); 340 pos = hostapd_eid_adv_proto(hapd, pos); 341 pos = hostapd_eid_roaming_consortium(hapd, pos); 342 343 pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp, 344 &hapd->iface->cs_c_off_proberesp); 345#ifdef CONFIG_IEEE80211AC 346 pos = hostapd_eid_vht_capabilities(hapd, pos); 347 pos = hostapd_eid_vht_operation(hapd, pos); 348#endif /* CONFIG_IEEE80211AC */ 349 350 /* Wi-Fi Alliance WMM */ 351 pos = hostapd_eid_wmm(hapd, pos); 352 353#ifdef CONFIG_WPS 354 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) { 355 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie), 356 wpabuf_len(hapd->wps_probe_resp_ie)); 357 pos += wpabuf_len(hapd->wps_probe_resp_ie); 358 } 359#endif /* CONFIG_WPS */ 360 361#ifdef CONFIG_P2P 362 if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p && 363 hapd->p2p_probe_resp_ie) { 364 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie), 365 wpabuf_len(hapd->p2p_probe_resp_ie)); 366 pos += wpabuf_len(hapd->p2p_probe_resp_ie); 367 } 368#endif /* CONFIG_P2P */ 369#ifdef CONFIG_P2P_MANAGER 370 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 371 P2P_MANAGE) 372 pos = hostapd_eid_p2p_manage(hapd, pos); 373#endif /* CONFIG_P2P_MANAGER */ 374 375#ifdef CONFIG_HS20 376 pos = hostapd_eid_hs20_indication(hapd, pos); 377#endif /* CONFIG_HS20 */ 378 379 if (hapd->conf->vendor_elements) { 380 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements), 381 wpabuf_len(hapd->conf->vendor_elements)); 382 pos += wpabuf_len(hapd->conf->vendor_elements); 383 } 384 385 *resp_len = pos - (u8 *) resp; 386 return (u8 *) resp; 387} 388 389 390enum ssid_match_result { 391 NO_SSID_MATCH, 392 EXACT_SSID_MATCH, 393 WILDCARD_SSID_MATCH 394}; 395 396static enum ssid_match_result ssid_match(struct hostapd_data *hapd, 397 const u8 *ssid, size_t ssid_len, 398 const u8 *ssid_list, 399 size_t ssid_list_len) 400{ 401 const u8 *pos, *end; 402 int wildcard = 0; 403 404 if (ssid_len == 0) 405 wildcard = 1; 406 if (ssid_len == hapd->conf->ssid.ssid_len && 407 os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0) 408 return EXACT_SSID_MATCH; 409 410 if (ssid_list == NULL) 411 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 412 413 pos = ssid_list; 414 end = ssid_list + ssid_list_len; 415 while (pos + 1 <= end) { 416 if (pos + 2 + pos[1] > end) 417 break; 418 if (pos[1] == 0) 419 wildcard = 1; 420 if (pos[1] == hapd->conf->ssid.ssid_len && 421 os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0) 422 return EXACT_SSID_MATCH; 423 pos += 2 + pos[1]; 424 } 425 426 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 427} 428 429 430void handle_probe_req(struct hostapd_data *hapd, 431 const struct ieee80211_mgmt *mgmt, size_t len, 432 int ssi_signal) 433{ 434 u8 *resp; 435 struct ieee802_11_elems elems; 436 const u8 *ie; 437 size_t ie_len; 438 struct sta_info *sta = NULL; 439 size_t i, resp_len; 440 int noack; 441 enum ssid_match_result res; 442 443 ie = mgmt->u.probe_req.variable; 444 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)) 445 return; 446 ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)); 447 448 for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++) 449 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx, 450 mgmt->sa, mgmt->da, mgmt->bssid, 451 ie, ie_len, ssi_signal) > 0) 452 return; 453 454 if (!hapd->iconf->send_probe_response) 455 return; 456 457 if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) { 458 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR, 459 MAC2STR(mgmt->sa)); 460 return; 461 } 462 463 if ((!elems.ssid || !elems.supp_rates)) { 464 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request " 465 "without SSID or supported rates element", 466 MAC2STR(mgmt->sa)); 467 return; 468 } 469 470#ifdef CONFIG_P2P 471 if (hapd->p2p && elems.wps_ie) { 472 struct wpabuf *wps; 473 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA); 474 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) { 475 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 476 "due to mismatch with Requested Device " 477 "Type"); 478 wpabuf_free(wps); 479 return; 480 } 481 wpabuf_free(wps); 482 } 483 484 if (hapd->p2p && elems.p2p) { 485 struct wpabuf *p2p; 486 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE); 487 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) { 488 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 489 "due to mismatch with Device ID"); 490 wpabuf_free(p2p); 491 return; 492 } 493 wpabuf_free(p2p); 494 } 495#endif /* CONFIG_P2P */ 496 497 if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 && 498 elems.ssid_list_len == 0) { 499 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for " 500 "broadcast SSID ignored", MAC2STR(mgmt->sa)); 501 return; 502 } 503 504 sta = ap_get_sta(hapd, mgmt->sa); 505 506#ifdef CONFIG_P2P 507 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 508 elems.ssid_len == P2P_WILDCARD_SSID_LEN && 509 os_memcmp(elems.ssid, P2P_WILDCARD_SSID, 510 P2P_WILDCARD_SSID_LEN) == 0) { 511 /* Process P2P Wildcard SSID like Wildcard SSID */ 512 elems.ssid_len = 0; 513 } 514#endif /* CONFIG_P2P */ 515 516 res = ssid_match(hapd, elems.ssid, elems.ssid_len, 517 elems.ssid_list, elems.ssid_list_len); 518 if (res != NO_SSID_MATCH) { 519 if (sta) 520 sta->ssid_probe = &hapd->conf->ssid; 521 } else { 522 if (!(mgmt->da[0] & 0x01)) { 523 char ssid_txt[33]; 524 ieee802_11_print_ssid(ssid_txt, elems.ssid, 525 elems.ssid_len); 526 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 527 " for foreign SSID '%s' (DA " MACSTR ")%s", 528 MAC2STR(mgmt->sa), ssid_txt, 529 MAC2STR(mgmt->da), 530 elems.ssid_list ? " (SSID list)" : ""); 531 } 532 return; 533 } 534 535#ifdef CONFIG_INTERWORKING 536 if (elems.interworking && elems.interworking_len >= 1) { 537 u8 ant = elems.interworking[0] & 0x0f; 538 if (ant != INTERWORKING_ANT_WILDCARD && 539 ant != hapd->conf->access_network_type) { 540 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 541 " for mismatching ANT %u ignored", 542 MAC2STR(mgmt->sa), ant); 543 return; 544 } 545 } 546 547 if (elems.interworking && 548 (elems.interworking_len == 7 || elems.interworking_len == 9)) { 549 const u8 *hessid; 550 if (elems.interworking_len == 7) 551 hessid = elems.interworking + 1; 552 else 553 hessid = elems.interworking + 1 + 2; 554 if (!is_broadcast_ether_addr(hessid) && 555 os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) { 556 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 557 " for mismatching HESSID " MACSTR 558 " ignored", 559 MAC2STR(mgmt->sa), MAC2STR(hessid)); 560 return; 561 } 562 } 563#endif /* CONFIG_INTERWORKING */ 564 565#ifdef CONFIG_P2P 566 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 567 supp_rates_11b_only(&elems)) { 568 /* Indicates support for 11b rates only */ 569 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from " 570 MACSTR " with only 802.11b rates", 571 MAC2STR(mgmt->sa)); 572 return; 573 } 574#endif /* CONFIG_P2P */ 575 576 /* TODO: verify that supp_rates contains at least one matching rate 577 * with AP configuration */ 578 579#ifdef CONFIG_TESTING_OPTIONS 580 if (hapd->iconf->ignore_probe_probability > 0.0d && 581 drand48() < hapd->iconf->ignore_probe_probability) { 582 wpa_printf(MSG_INFO, 583 "TESTING: ignoring probe request from " MACSTR, 584 MAC2STR(mgmt->sa)); 585 return; 586 } 587#endif /* CONFIG_TESTING_OPTIONS */ 588 589 resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL, 590 &resp_len); 591 if (resp == NULL) 592 return; 593 594 /* 595 * If this is a broadcast probe request, apply no ack policy to avoid 596 * excessive retries. 597 */ 598 noack = !!(res == WILDCARD_SSID_MATCH && 599 is_broadcast_ether_addr(mgmt->da)); 600 601 if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0) 602 wpa_printf(MSG_INFO, "handle_probe_req: send failed"); 603 604 os_free(resp); 605 606 wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s " 607 "SSID", MAC2STR(mgmt->sa), 608 elems.ssid_len == 0 ? "broadcast" : "our"); 609} 610 611 612static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd, 613 size_t *resp_len) 614{ 615 /* check probe response offloading caps and print warnings */ 616 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD)) 617 return NULL; 618 619#ifdef CONFIG_WPS 620 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie && 621 (!(hapd->iface->probe_resp_offloads & 622 (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS | 623 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2)))) 624 wpa_printf(MSG_WARNING, "Device is trying to offload WPS " 625 "Probe Response while not supporting this"); 626#endif /* CONFIG_WPS */ 627 628#ifdef CONFIG_P2P 629 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie && 630 !(hapd->iface->probe_resp_offloads & 631 WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P)) 632 wpa_printf(MSG_WARNING, "Device is trying to offload P2P " 633 "Probe Response while not supporting this"); 634#endif /* CONFIG_P2P */ 635 636 if (hapd->conf->interworking && 637 !(hapd->iface->probe_resp_offloads & 638 WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING)) 639 wpa_printf(MSG_WARNING, "Device is trying to offload " 640 "Interworking Probe Response while not supporting " 641 "this"); 642 643 /* Generate a Probe Response template for the non-P2P case */ 644 return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len); 645} 646 647#endif /* NEED_AP_MLME */ 648 649 650int ieee802_11_build_ap_params(struct hostapd_data *hapd, 651 struct wpa_driver_ap_params *params) 652{ 653 struct ieee80211_mgmt *head = NULL; 654 u8 *tail = NULL; 655 size_t head_len = 0, tail_len = 0; 656 u8 *resp = NULL; 657 size_t resp_len = 0; 658#ifdef NEED_AP_MLME 659 u16 capab_info; 660 u8 *pos, *tailpos; 661 662#define BEACON_HEAD_BUF_SIZE 256 663#define BEACON_TAIL_BUF_SIZE 512 664 head = os_zalloc(BEACON_HEAD_BUF_SIZE); 665 tail_len = BEACON_TAIL_BUF_SIZE; 666#ifdef CONFIG_WPS 667 if (hapd->conf->wps_state && hapd->wps_beacon_ie) 668 tail_len += wpabuf_len(hapd->wps_beacon_ie); 669#endif /* CONFIG_WPS */ 670#ifdef CONFIG_P2P 671 if (hapd->p2p_beacon_ie) 672 tail_len += wpabuf_len(hapd->p2p_beacon_ie); 673#endif /* CONFIG_P2P */ 674 if (hapd->conf->vendor_elements) 675 tail_len += wpabuf_len(hapd->conf->vendor_elements); 676 tailpos = tail = os_malloc(tail_len); 677 if (head == NULL || tail == NULL) { 678 wpa_printf(MSG_ERROR, "Failed to set beacon data"); 679 os_free(head); 680 os_free(tail); 681 return -1; 682 } 683 684 head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 685 WLAN_FC_STYPE_BEACON); 686 head->duration = host_to_le16(0); 687 os_memset(head->da, 0xff, ETH_ALEN); 688 689 os_memcpy(head->sa, hapd->own_addr, ETH_ALEN); 690 os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN); 691 head->u.beacon.beacon_int = 692 host_to_le16(hapd->iconf->beacon_int); 693 694 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 695 capab_info = hostapd_own_capab_info(hapd, NULL, 0); 696 head->u.beacon.capab_info = host_to_le16(capab_info); 697 pos = &head->u.beacon.variable[0]; 698 699 /* SSID */ 700 *pos++ = WLAN_EID_SSID; 701 if (hapd->conf->ignore_broadcast_ssid == 2) { 702 /* clear the data, but keep the correct length of the SSID */ 703 *pos++ = hapd->conf->ssid.ssid_len; 704 os_memset(pos, 0, hapd->conf->ssid.ssid_len); 705 pos += hapd->conf->ssid.ssid_len; 706 } else if (hapd->conf->ignore_broadcast_ssid) { 707 *pos++ = 0; /* empty SSID */ 708 } else { 709 *pos++ = hapd->conf->ssid.ssid_len; 710 os_memcpy(pos, hapd->conf->ssid.ssid, 711 hapd->conf->ssid.ssid_len); 712 pos += hapd->conf->ssid.ssid_len; 713 } 714 715 /* Supported rates */ 716 pos = hostapd_eid_supp_rates(hapd, pos); 717 718 /* DS Params */ 719 pos = hostapd_eid_ds_params(hapd, pos); 720 721 head_len = pos - (u8 *) head; 722 723 tailpos = hostapd_eid_country(hapd, tailpos, 724 tail + BEACON_TAIL_BUF_SIZE - tailpos); 725 726 /* ERP Information element */ 727 tailpos = hostapd_eid_erp_info(hapd, tailpos); 728 729 /* Extended supported rates */ 730 tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos); 731 732 /* RSN, MDIE, WPA */ 733 tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - 734 tailpos); 735 736 tailpos = hostapd_eid_bss_load(hapd, tailpos, 737 tail + BEACON_TAIL_BUF_SIZE - tailpos); 738 739#ifdef CONFIG_IEEE80211N 740 tailpos = hostapd_eid_ht_capabilities(hapd, tailpos); 741 tailpos = hostapd_eid_ht_operation(hapd, tailpos); 742#endif /* CONFIG_IEEE80211N */ 743 744 tailpos = hostapd_eid_ext_capab(hapd, tailpos); 745 746 /* 747 * TODO: Time Advertisement element should only be included in some 748 * DTIM Beacon frames. 749 */ 750 tailpos = hostapd_eid_time_adv(hapd, tailpos); 751 752 tailpos = hostapd_eid_interworking(hapd, tailpos); 753 tailpos = hostapd_eid_adv_proto(hapd, tailpos); 754 tailpos = hostapd_eid_roaming_consortium(hapd, tailpos); 755 tailpos = hostapd_add_csa_elems(hapd, tailpos, tail, 756 &hapd->iface->cs_c_off_beacon); 757#ifdef CONFIG_IEEE80211AC 758 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos); 759 tailpos = hostapd_eid_vht_operation(hapd, tailpos); 760#endif /* CONFIG_IEEE80211AC */ 761 762 /* Wi-Fi Alliance WMM */ 763 tailpos = hostapd_eid_wmm(hapd, tailpos); 764 765#ifdef CONFIG_WPS 766 if (hapd->conf->wps_state && hapd->wps_beacon_ie) { 767 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie), 768 wpabuf_len(hapd->wps_beacon_ie)); 769 tailpos += wpabuf_len(hapd->wps_beacon_ie); 770 } 771#endif /* CONFIG_WPS */ 772 773#ifdef CONFIG_P2P 774 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) { 775 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie), 776 wpabuf_len(hapd->p2p_beacon_ie)); 777 tailpos += wpabuf_len(hapd->p2p_beacon_ie); 778 } 779#endif /* CONFIG_P2P */ 780#ifdef CONFIG_P2P_MANAGER 781 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 782 P2P_MANAGE) 783 tailpos = hostapd_eid_p2p_manage(hapd, tailpos); 784#endif /* CONFIG_P2P_MANAGER */ 785 786#ifdef CONFIG_HS20 787 tailpos = hostapd_eid_hs20_indication(hapd, tailpos); 788#endif /* CONFIG_HS20 */ 789 790 if (hapd->conf->vendor_elements) { 791 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements), 792 wpabuf_len(hapd->conf->vendor_elements)); 793 tailpos += wpabuf_len(hapd->conf->vendor_elements); 794 } 795 796 tail_len = tailpos > tail ? tailpos - tail : 0; 797 798 resp = hostapd_probe_resp_offloads(hapd, &resp_len); 799#endif /* NEED_AP_MLME */ 800 801 os_memset(params, 0, sizeof(*params)); 802 params->head = (u8 *) head; 803 params->head_len = head_len; 804 params->tail = tail; 805 params->tail_len = tail_len; 806 params->proberesp = resp; 807 params->proberesp_len = resp_len; 808 params->dtim_period = hapd->conf->dtim_period; 809 params->beacon_int = hapd->iconf->beacon_int; 810 params->basic_rates = hapd->iface->basic_rates; 811 params->ssid = hapd->conf->ssid.ssid; 812 params->ssid_len = hapd->conf->ssid.ssid_len; 813 params->pairwise_ciphers = hapd->conf->rsn_pairwise ? 814 hapd->conf->rsn_pairwise : hapd->conf->wpa_pairwise; 815 params->group_cipher = hapd->conf->wpa_group; 816 params->key_mgmt_suites = hapd->conf->wpa_key_mgmt; 817 params->auth_algs = hapd->conf->auth_algs; 818 params->wpa_version = hapd->conf->wpa; 819 params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa || 820 (hapd->conf->ieee802_1x && 821 (hapd->conf->default_wep_key_len || 822 hapd->conf->individual_wep_key_len)); 823 switch (hapd->conf->ignore_broadcast_ssid) { 824 case 0: 825 params->hide_ssid = NO_SSID_HIDING; 826 break; 827 case 1: 828 params->hide_ssid = HIDDEN_SSID_ZERO_LEN; 829 break; 830 case 2: 831 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS; 832 break; 833 } 834 params->isolate = hapd->conf->isolate; 835#ifdef NEED_AP_MLME 836 params->cts_protect = !!(ieee802_11_erp_info(hapd) & 837 ERP_INFO_USE_PROTECTION); 838 params->preamble = hapd->iface->num_sta_no_short_preamble == 0 && 839 hapd->iconf->preamble == SHORT_PREAMBLE; 840 if (hapd->iface->current_mode && 841 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 842 params->short_slot_time = 843 hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1; 844 else 845 params->short_slot_time = -1; 846 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) 847 params->ht_opmode = -1; 848 else 849 params->ht_opmode = hapd->iface->ht_op_mode; 850#endif /* NEED_AP_MLME */ 851 params->interworking = hapd->conf->interworking; 852 if (hapd->conf->interworking && 853 !is_zero_ether_addr(hapd->conf->hessid)) 854 params->hessid = hapd->conf->hessid; 855 params->access_network_type = hapd->conf->access_network_type; 856 params->ap_max_inactivity = hapd->conf->ap_max_inactivity; 857#ifdef CONFIG_HS20 858 params->disable_dgaf = hapd->conf->disable_dgaf; 859#endif /* CONFIG_HS20 */ 860 return 0; 861} 862 863 864void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params) 865{ 866 os_free(params->tail); 867 params->tail = NULL; 868 os_free(params->head); 869 params->head = NULL; 870 os_free(params->proberesp); 871 params->proberesp = NULL; 872} 873 874 875int ieee802_11_set_beacon(struct hostapd_data *hapd) 876{ 877 struct wpa_driver_ap_params params; 878 struct wpabuf *beacon, *proberesp, *assocresp; 879 int res, ret = -1; 880 881 if (hapd->iface->csa_in_progress) { 882 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period"); 883 return -1; 884 } 885 886 hapd->beacon_set_done = 1; 887 888 if (ieee802_11_build_ap_params(hapd, ¶ms) < 0) 889 return -1; 890 891 if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) < 892 0) 893 goto fail; 894 895 params.beacon_ies = beacon; 896 params.proberesp_ies = proberesp; 897 params.assocresp_ies = assocresp; 898 899 res = hostapd_drv_set_ap(hapd, ¶ms); 900 hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp); 901 if (res) 902 wpa_printf(MSG_ERROR, "Failed to set beacon parameters"); 903 else 904 ret = 0; 905fail: 906 ieee802_11_free_ap_params(¶ms); 907 return ret; 908} 909 910 911int ieee802_11_set_beacons(struct hostapd_iface *iface) 912{ 913 size_t i; 914 int ret = 0; 915 916 for (i = 0; i < iface->num_bss; i++) { 917 if (iface->bss[i]->started && 918 ieee802_11_set_beacon(iface->bss[i]) < 0) 919 ret = -1; 920 } 921 922 return ret; 923} 924 925 926/* only update beacons if started */ 927int ieee802_11_update_beacons(struct hostapd_iface *iface) 928{ 929 size_t i; 930 int ret = 0; 931 932 for (i = 0; i < iface->num_bss; i++) { 933 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started && 934 ieee802_11_set_beacon(iface->bss[i]) < 0) 935 ret = -1; 936 } 937 938 return ret; 939} 940 941#endif /* CONFIG_NATIVE_WINDOWS */ 942