beacon.c revision 292b0c3a742226c295f8db76eaef9e90c90e7513
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 program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Alternatively, this software may be distributed under the terms of BSD 12 * license. 13 * 14 * See README and COPYING for more details. 15 */ 16 17#include "utils/includes.h" 18 19#ifndef CONFIG_NATIVE_WINDOWS 20 21#include "utils/common.h" 22#include "common/ieee802_11_defs.h" 23#include "common/ieee802_11_common.h" 24#include "drivers/driver.h" 25#include "wps/wps_defs.h" 26#include "p2p/p2p.h" 27#include "hostapd.h" 28#include "ieee802_11.h" 29#include "wpa_auth.h" 30#include "wmm.h" 31#include "ap_config.h" 32#include "sta_info.h" 33#include "p2p_hostapd.h" 34#include "ap_drv_ops.h" 35#include "beacon.h" 36#include "hs20.h" 37 38 39#ifdef NEED_AP_MLME 40 41static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len) 42{ 43#ifdef CONFIG_TESTING_OPTIONS 44 if (hapd->conf->bss_load_test_set) { 45 if (2 + 5 > len) 46 return eid; 47 *eid++ = WLAN_EID_BSS_LOAD; 48 *eid++ = 5; 49 os_memcpy(eid, hapd->conf->bss_load_test, 5); 50 eid += 5; 51 } 52#endif /* CONFIG_TESTING_OPTIONS */ 53 return eid; 54} 55 56 57static u8 ieee802_11_erp_info(struct hostapd_data *hapd) 58{ 59 u8 erp = 0; 60 61 if (hapd->iface->current_mode == NULL || 62 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 63 return 0; 64 65 if (hapd->iface->olbc) 66 erp |= ERP_INFO_USE_PROTECTION; 67 if (hapd->iface->num_sta_non_erp > 0) { 68 erp |= ERP_INFO_NON_ERP_PRESENT | 69 ERP_INFO_USE_PROTECTION; 70 } 71 if (hapd->iface->num_sta_no_short_preamble > 0 || 72 hapd->iconf->preamble == LONG_PREAMBLE) 73 erp |= ERP_INFO_BARKER_PREAMBLE_MODE; 74 75 return erp; 76} 77 78 79static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid) 80{ 81 *eid++ = WLAN_EID_DS_PARAMS; 82 *eid++ = 1; 83 *eid++ = hapd->iconf->channel; 84 return eid; 85} 86 87 88static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid) 89{ 90 if (hapd->iface->current_mode == NULL || 91 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 92 return eid; 93 94 /* Set NonERP_present and use_protection bits if there 95 * are any associated NonERP stations. */ 96 /* TODO: use_protection bit can be set to zero even if 97 * there are NonERP stations present. This optimization 98 * might be useful if NonERP stations are "quiet". 99 * See 802.11g/D6 E-1 for recommended practice. 100 * In addition, Non ERP present might be set, if AP detects Non ERP 101 * operation on other APs. */ 102 103 /* Add ERP Information element */ 104 *eid++ = WLAN_EID_ERP_INFO; 105 *eid++ = 1; 106 *eid++ = ieee802_11_erp_info(hapd); 107 108 return eid; 109} 110 111 112static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing, 113 struct hostapd_channel_data *start, 114 struct hostapd_channel_data *prev) 115{ 116 if (end - pos < 3) 117 return pos; 118 119 /* first channel number */ 120 *pos++ = start->chan; 121 /* number of channels */ 122 *pos++ = (prev->chan - start->chan) / chan_spacing + 1; 123 /* maximum transmit power level */ 124 *pos++ = start->max_tx_power; 125 126 return pos; 127} 128 129 130static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid, 131 int max_len) 132{ 133 u8 *pos = eid; 134 u8 *end = eid + max_len; 135 int i; 136 struct hostapd_hw_modes *mode; 137 struct hostapd_channel_data *start, *prev; 138 int chan_spacing = 1; 139 140 if (!hapd->iconf->ieee80211d || max_len < 6 || 141 hapd->iface->current_mode == NULL) 142 return eid; 143 144 *pos++ = WLAN_EID_COUNTRY; 145 pos++; /* length will be set later */ 146 os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */ 147 pos += 3; 148 149 mode = hapd->iface->current_mode; 150 if (mode->mode == HOSTAPD_MODE_IEEE80211A) 151 chan_spacing = 4; 152 153 start = prev = NULL; 154 for (i = 0; i < mode->num_channels; i++) { 155 struct hostapd_channel_data *chan = &mode->channels[i]; 156 if (chan->flag & HOSTAPD_CHAN_DISABLED) 157 continue; 158 if (start && prev && 159 prev->chan + chan_spacing == chan->chan && 160 start->max_tx_power == chan->max_tx_power) { 161 prev = chan; 162 continue; /* can use same entry */ 163 } 164 165 if (start) { 166 pos = hostapd_eid_country_add(pos, end, chan_spacing, 167 start, prev); 168 start = NULL; 169 } 170 171 /* Start new group */ 172 start = prev = chan; 173 } 174 175 if (start) { 176 pos = hostapd_eid_country_add(pos, end, chan_spacing, 177 start, prev); 178 } 179 180 if ((pos - eid) & 1) { 181 if (end - pos < 1) 182 return eid; 183 *pos++ = 0; /* pad for 16-bit alignment */ 184 } 185 186 eid[1] = (pos - eid) - 2; 187 188 return pos; 189} 190 191 192static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len) 193{ 194 const u8 *ie; 195 size_t ielen; 196 197 ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen); 198 if (ie == NULL || ielen > len) 199 return eid; 200 201 os_memcpy(eid, ie, ielen); 202 return eid + ielen; 203} 204 205 206static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid) 207{ 208 u8 chan; 209 210 if (!hapd->iface->cs_freq) 211 return eid; 212 213 if (ieee80211_freq_to_chan(hapd->iface->cs_freq, &chan) == 214 NUM_HOSTAPD_MODES) 215 return eid; 216 217 *eid++ = WLAN_EID_CHANNEL_SWITCH; 218 *eid++ = 3; 219 *eid++ = hapd->iface->cs_block_tx; 220 *eid++ = chan; 221 *eid++ = hapd->iface->cs_count; 222 223 return eid; 224} 225 226 227static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd, 228 struct sta_info *sta, 229 const struct ieee80211_mgmt *req, 230 int is_p2p, size_t *resp_len) 231{ 232 struct ieee80211_mgmt *resp; 233 u8 *pos, *epos, *old_pos; 234 size_t buflen; 235 236#define MAX_PROBERESP_LEN 768 237 buflen = MAX_PROBERESP_LEN; 238#ifdef CONFIG_WPS 239 if (hapd->wps_probe_resp_ie) 240 buflen += wpabuf_len(hapd->wps_probe_resp_ie); 241#endif /* CONFIG_WPS */ 242#ifdef CONFIG_P2P 243 if (hapd->p2p_probe_resp_ie) 244 buflen += wpabuf_len(hapd->p2p_probe_resp_ie); 245#endif /* CONFIG_P2P */ 246 if (hapd->conf->vendor_elements) 247 buflen += wpabuf_len(hapd->conf->vendor_elements); 248 resp = os_zalloc(buflen); 249 if (resp == NULL) 250 return NULL; 251 252 epos = ((u8 *) resp) + MAX_PROBERESP_LEN; 253 254 resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 255 WLAN_FC_STYPE_PROBE_RESP); 256 if (req) 257 os_memcpy(resp->da, req->sa, ETH_ALEN); 258 os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN); 259 260 os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN); 261 resp->u.probe_resp.beacon_int = 262 host_to_le16(hapd->iconf->beacon_int); 263 264 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 265 resp->u.probe_resp.capab_info = 266 host_to_le16(hostapd_own_capab_info(hapd, sta, 1)); 267 268 pos = resp->u.probe_resp.variable; 269 *pos++ = WLAN_EID_SSID; 270 *pos++ = hapd->conf->ssid.ssid_len; 271 os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len); 272 pos += hapd->conf->ssid.ssid_len; 273 274 /* Supported rates */ 275 pos = hostapd_eid_supp_rates(hapd, pos); 276 277 /* DS Params */ 278 pos = hostapd_eid_ds_params(hapd, pos); 279 280 pos = hostapd_eid_country(hapd, pos, epos - pos); 281 282 /* ERP Information element */ 283 pos = hostapd_eid_erp_info(hapd, pos); 284 285 /* Extended supported rates */ 286 pos = hostapd_eid_ext_supp_rates(hapd, pos); 287 288 /* RSN, MDIE, WPA */ 289 pos = hostapd_eid_wpa(hapd, pos, epos - pos); 290 291 pos = hostapd_eid_bss_load(hapd, pos, epos - pos); 292 293#ifdef CONFIG_IEEE80211N 294 pos = hostapd_eid_ht_capabilities(hapd, pos); 295 pos = hostapd_eid_ht_operation(hapd, pos); 296#endif /* CONFIG_IEEE80211N */ 297 298 pos = hostapd_eid_ext_capab(hapd, pos); 299 300 pos = hostapd_eid_time_adv(hapd, pos); 301 pos = hostapd_eid_time_zone(hapd, pos); 302 303 pos = hostapd_eid_interworking(hapd, pos); 304 pos = hostapd_eid_adv_proto(hapd, pos); 305 pos = hostapd_eid_roaming_consortium(hapd, pos); 306 307 old_pos = pos; 308 pos = hostapd_eid_csa(hapd, pos); 309 310 /* save an offset to the counter - should be last byte */ 311 hapd->iface->cs_c_off_proberesp = (pos != old_pos) ? 312 pos - (u8 *) resp - 1 : 0; 313 314#ifdef CONFIG_IEEE80211AC 315 pos = hostapd_eid_vht_capabilities(hapd, pos); 316 pos = hostapd_eid_vht_operation(hapd, pos); 317#endif /* CONFIG_IEEE80211AC */ 318 319 /* Wi-Fi Alliance WMM */ 320 pos = hostapd_eid_wmm(hapd, pos); 321 322#ifdef CONFIG_WPS 323 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) { 324 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie), 325 wpabuf_len(hapd->wps_probe_resp_ie)); 326 pos += wpabuf_len(hapd->wps_probe_resp_ie); 327 } 328#endif /* CONFIG_WPS */ 329 330#ifdef CONFIG_P2P 331 if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p && 332 hapd->p2p_probe_resp_ie) { 333 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie), 334 wpabuf_len(hapd->p2p_probe_resp_ie)); 335 pos += wpabuf_len(hapd->p2p_probe_resp_ie); 336 } 337#endif /* CONFIG_P2P */ 338#ifdef CONFIG_P2P_MANAGER 339 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 340 P2P_MANAGE) 341 pos = hostapd_eid_p2p_manage(hapd, pos); 342#endif /* CONFIG_P2P_MANAGER */ 343 344#ifdef CONFIG_HS20 345 pos = hostapd_eid_hs20_indication(hapd, pos); 346#endif /* CONFIG_HS20 */ 347 348 if (hapd->conf->vendor_elements) { 349 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements), 350 wpabuf_len(hapd->conf->vendor_elements)); 351 pos += wpabuf_len(hapd->conf->vendor_elements); 352 } 353 354 *resp_len = pos - (u8 *) resp; 355 return (u8 *) resp; 356} 357 358 359enum ssid_match_result { 360 NO_SSID_MATCH, 361 EXACT_SSID_MATCH, 362 WILDCARD_SSID_MATCH 363}; 364 365static enum ssid_match_result ssid_match(struct hostapd_data *hapd, 366 const u8 *ssid, size_t ssid_len, 367 const u8 *ssid_list, 368 size_t ssid_list_len) 369{ 370 const u8 *pos, *end; 371 int wildcard = 0; 372 373 if (ssid_len == 0) 374 wildcard = 1; 375 if (ssid_len == hapd->conf->ssid.ssid_len && 376 os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0) 377 return EXACT_SSID_MATCH; 378 379 if (ssid_list == NULL) 380 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 381 382 pos = ssid_list; 383 end = ssid_list + ssid_list_len; 384 while (pos + 1 <= end) { 385 if (pos + 2 + pos[1] > end) 386 break; 387 if (pos[1] == 0) 388 wildcard = 1; 389 if (pos[1] == hapd->conf->ssid.ssid_len && 390 os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0) 391 return EXACT_SSID_MATCH; 392 pos += 2 + pos[1]; 393 } 394 395 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 396} 397 398 399void handle_probe_req(struct hostapd_data *hapd, 400 const struct ieee80211_mgmt *mgmt, size_t len, 401 int ssi_signal) 402{ 403 u8 *resp; 404 struct ieee802_11_elems elems; 405 const u8 *ie; 406 size_t ie_len; 407 struct sta_info *sta = NULL; 408 size_t i, resp_len; 409 int noack; 410 enum ssid_match_result res; 411 412 ie = mgmt->u.probe_req.variable; 413 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)) 414 return; 415 ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)); 416 417 for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++) 418 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx, 419 mgmt->sa, mgmt->da, mgmt->bssid, 420 ie, ie_len, ssi_signal) > 0) 421 return; 422 423 if (!hapd->iconf->send_probe_response) 424 return; 425 426 if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) { 427 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR, 428 MAC2STR(mgmt->sa)); 429 return; 430 } 431 432 if ((!elems.ssid || !elems.supp_rates)) { 433 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request " 434 "without SSID or supported rates element", 435 MAC2STR(mgmt->sa)); 436 return; 437 } 438 439#ifdef CONFIG_P2P 440 if (hapd->p2p && elems.wps_ie) { 441 struct wpabuf *wps; 442 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA); 443 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) { 444 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 445 "due to mismatch with Requested Device " 446 "Type"); 447 wpabuf_free(wps); 448 return; 449 } 450 wpabuf_free(wps); 451 } 452 453 if (hapd->p2p && elems.p2p) { 454 struct wpabuf *p2p; 455 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE); 456 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) { 457 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 458 "due to mismatch with Device ID"); 459 wpabuf_free(p2p); 460 return; 461 } 462 wpabuf_free(p2p); 463 } 464#endif /* CONFIG_P2P */ 465 466 if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 && 467 elems.ssid_list_len == 0) { 468 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for " 469 "broadcast SSID ignored", MAC2STR(mgmt->sa)); 470 return; 471 } 472 473 sta = ap_get_sta(hapd, mgmt->sa); 474 475#ifdef CONFIG_P2P 476 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 477 elems.ssid_len == P2P_WILDCARD_SSID_LEN && 478 os_memcmp(elems.ssid, P2P_WILDCARD_SSID, 479 P2P_WILDCARD_SSID_LEN) == 0) { 480 /* Process P2P Wildcard SSID like Wildcard SSID */ 481 elems.ssid_len = 0; 482 } 483#endif /* CONFIG_P2P */ 484 485 res = ssid_match(hapd, elems.ssid, elems.ssid_len, 486 elems.ssid_list, elems.ssid_list_len); 487 if (res != NO_SSID_MATCH) { 488 if (sta) 489 sta->ssid_probe = &hapd->conf->ssid; 490 } else { 491 if (!(mgmt->da[0] & 0x01)) { 492 char ssid_txt[33]; 493 ieee802_11_print_ssid(ssid_txt, elems.ssid, 494 elems.ssid_len); 495 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 496 " for foreign SSID '%s' (DA " MACSTR ")%s", 497 MAC2STR(mgmt->sa), ssid_txt, 498 MAC2STR(mgmt->da), 499 elems.ssid_list ? " (SSID list)" : ""); 500 } 501 return; 502 } 503 504#ifdef CONFIG_INTERWORKING 505 if (elems.interworking && elems.interworking_len >= 1) { 506 u8 ant = elems.interworking[0] & 0x0f; 507 if (ant != INTERWORKING_ANT_WILDCARD && 508 ant != hapd->conf->access_network_type) { 509 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 510 " for mismatching ANT %u ignored", 511 MAC2STR(mgmt->sa), ant); 512 return; 513 } 514 } 515 516 if (elems.interworking && 517 (elems.interworking_len == 7 || elems.interworking_len == 9)) { 518 const u8 *hessid; 519 if (elems.interworking_len == 7) 520 hessid = elems.interworking + 1; 521 else 522 hessid = elems.interworking + 1 + 2; 523 if (!is_broadcast_ether_addr(hessid) && 524 os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) { 525 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 526 " for mismatching HESSID " MACSTR 527 " ignored", 528 MAC2STR(mgmt->sa), MAC2STR(hessid)); 529 return; 530 } 531 } 532#endif /* CONFIG_INTERWORKING */ 533 534#ifdef CONFIG_P2P 535 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 536 supp_rates_11b_only(&elems)) { 537 /* Indicates support for 11b rates only */ 538 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from " 539 MACSTR " with only 802.11b rates", 540 MAC2STR(mgmt->sa)); 541 return; 542 } 543#endif /* CONFIG_P2P */ 544 545 /* TODO: verify that supp_rates contains at least one matching rate 546 * with AP configuration */ 547 548#ifdef CONFIG_TESTING_OPTIONS 549 if (hapd->iconf->ignore_probe_probability > 0.0d && 550 drand48() < hapd->iconf->ignore_probe_probability) { 551 wpa_printf(MSG_INFO, 552 "TESTING: ignoring probe request from " MACSTR, 553 MAC2STR(mgmt->sa)); 554 return; 555 } 556#endif /* CONFIG_TESTING_OPTIONS */ 557 558 resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL, 559 &resp_len); 560 if (resp == NULL) 561 return; 562 563 /* 564 * If this is a broadcast probe request, apply no ack policy to avoid 565 * excessive retries. 566 */ 567 noack = !!(res == WILDCARD_SSID_MATCH && 568 is_broadcast_ether_addr(mgmt->da)); 569 570 if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0) 571 wpa_printf(MSG_INFO, "handle_probe_req: send failed"); 572 573 os_free(resp); 574 575 wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s " 576 "SSID", MAC2STR(mgmt->sa), 577 elems.ssid_len == 0 ? "broadcast" : "our"); 578} 579 580 581static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd, 582 size_t *resp_len) 583{ 584 /* check probe response offloading caps and print warnings */ 585 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD)) 586 return NULL; 587 588#ifdef CONFIG_WPS 589 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie && 590 (!(hapd->iface->probe_resp_offloads & 591 (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS | 592 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2)))) 593 wpa_printf(MSG_WARNING, "Device is trying to offload WPS " 594 "Probe Response while not supporting this"); 595#endif /* CONFIG_WPS */ 596 597#ifdef CONFIG_P2P 598 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie && 599 !(hapd->iface->probe_resp_offloads & 600 WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P)) 601 wpa_printf(MSG_WARNING, "Device is trying to offload P2P " 602 "Probe Response while not supporting this"); 603#endif /* CONFIG_P2P */ 604 605 if (hapd->conf->interworking && 606 !(hapd->iface->probe_resp_offloads & 607 WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING)) 608 wpa_printf(MSG_WARNING, "Device is trying to offload " 609 "Interworking Probe Response while not supporting " 610 "this"); 611 612 /* Generate a Probe Response template for the non-P2P case */ 613 return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len); 614} 615 616#endif /* NEED_AP_MLME */ 617 618 619int ieee802_11_build_ap_params(struct hostapd_data *hapd, 620 struct wpa_driver_ap_params *params) 621{ 622 struct ieee80211_mgmt *head = NULL; 623 u8 *tail = NULL; 624 size_t head_len = 0, tail_len = 0; 625 u8 *resp = NULL; 626 size_t resp_len = 0; 627#ifdef NEED_AP_MLME 628 u16 capab_info; 629 u8 *pos, *tailpos, *old_pos; 630 631#define BEACON_HEAD_BUF_SIZE 256 632#define BEACON_TAIL_BUF_SIZE 512 633 head = os_zalloc(BEACON_HEAD_BUF_SIZE); 634 tail_len = BEACON_TAIL_BUF_SIZE; 635#ifdef CONFIG_WPS 636 if (hapd->conf->wps_state && hapd->wps_beacon_ie) 637 tail_len += wpabuf_len(hapd->wps_beacon_ie); 638#endif /* CONFIG_WPS */ 639#ifdef CONFIG_P2P 640 if (hapd->p2p_beacon_ie) 641 tail_len += wpabuf_len(hapd->p2p_beacon_ie); 642#endif /* CONFIG_P2P */ 643 if (hapd->conf->vendor_elements) 644 tail_len += wpabuf_len(hapd->conf->vendor_elements); 645 tailpos = tail = os_malloc(tail_len); 646 if (head == NULL || tail == NULL) { 647 wpa_printf(MSG_ERROR, "Failed to set beacon data"); 648 os_free(head); 649 os_free(tail); 650 return -1; 651 } 652 653 head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 654 WLAN_FC_STYPE_BEACON); 655 head->duration = host_to_le16(0); 656 os_memset(head->da, 0xff, ETH_ALEN); 657 658 os_memcpy(head->sa, hapd->own_addr, ETH_ALEN); 659 os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN); 660 head->u.beacon.beacon_int = 661 host_to_le16(hapd->iconf->beacon_int); 662 663 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 664 capab_info = hostapd_own_capab_info(hapd, NULL, 0); 665 head->u.beacon.capab_info = host_to_le16(capab_info); 666 pos = &head->u.beacon.variable[0]; 667 668 /* SSID */ 669 *pos++ = WLAN_EID_SSID; 670 if (hapd->conf->ignore_broadcast_ssid == 2) { 671 /* clear the data, but keep the correct length of the SSID */ 672 *pos++ = hapd->conf->ssid.ssid_len; 673 os_memset(pos, 0, hapd->conf->ssid.ssid_len); 674 pos += hapd->conf->ssid.ssid_len; 675 } else if (hapd->conf->ignore_broadcast_ssid) { 676 *pos++ = 0; /* empty SSID */ 677 } else { 678 *pos++ = hapd->conf->ssid.ssid_len; 679 os_memcpy(pos, hapd->conf->ssid.ssid, 680 hapd->conf->ssid.ssid_len); 681 pos += hapd->conf->ssid.ssid_len; 682 } 683 684 /* Supported rates */ 685 pos = hostapd_eid_supp_rates(hapd, pos); 686 687 /* DS Params */ 688 pos = hostapd_eid_ds_params(hapd, pos); 689 690 head_len = pos - (u8 *) head; 691 692 tailpos = hostapd_eid_country(hapd, tailpos, 693 tail + BEACON_TAIL_BUF_SIZE - tailpos); 694 695 /* ERP Information element */ 696 tailpos = hostapd_eid_erp_info(hapd, tailpos); 697 698 /* Extended supported rates */ 699 tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos); 700 701 /* RSN, MDIE, WPA */ 702 tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - 703 tailpos); 704 705 tailpos = hostapd_eid_bss_load(hapd, tailpos, 706 tail + BEACON_TAIL_BUF_SIZE - tailpos); 707 708#ifdef CONFIG_IEEE80211N 709 tailpos = hostapd_eid_ht_capabilities(hapd, tailpos); 710 tailpos = hostapd_eid_ht_operation(hapd, tailpos); 711#endif /* CONFIG_IEEE80211N */ 712 713 tailpos = hostapd_eid_ext_capab(hapd, tailpos); 714 715 /* 716 * TODO: Time Advertisement element should only be included in some 717 * DTIM Beacon frames. 718 */ 719 tailpos = hostapd_eid_time_adv(hapd, tailpos); 720 721 tailpos = hostapd_eid_interworking(hapd, tailpos); 722 tailpos = hostapd_eid_adv_proto(hapd, tailpos); 723 tailpos = hostapd_eid_roaming_consortium(hapd, tailpos); 724 old_pos = tailpos; 725 tailpos = hostapd_eid_csa(hapd, tailpos); 726 hapd->iface->cs_c_off_beacon = (old_pos != tailpos) ? 727 tailpos - tail - 1 : 0; 728 729#ifdef CONFIG_IEEE80211AC 730 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos); 731 tailpos = hostapd_eid_vht_operation(hapd, tailpos); 732#endif /* CONFIG_IEEE80211AC */ 733 734 /* Wi-Fi Alliance WMM */ 735 tailpos = hostapd_eid_wmm(hapd, tailpos); 736 737#ifdef CONFIG_WPS 738 if (hapd->conf->wps_state && hapd->wps_beacon_ie) { 739 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie), 740 wpabuf_len(hapd->wps_beacon_ie)); 741 tailpos += wpabuf_len(hapd->wps_beacon_ie); 742 } 743#endif /* CONFIG_WPS */ 744 745#ifdef CONFIG_P2P 746 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) { 747 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie), 748 wpabuf_len(hapd->p2p_beacon_ie)); 749 tailpos += wpabuf_len(hapd->p2p_beacon_ie); 750 } 751#endif /* CONFIG_P2P */ 752#ifdef CONFIG_P2P_MANAGER 753 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 754 P2P_MANAGE) 755 tailpos = hostapd_eid_p2p_manage(hapd, tailpos); 756#endif /* CONFIG_P2P_MANAGER */ 757 758#ifdef CONFIG_HS20 759 tailpos = hostapd_eid_hs20_indication(hapd, tailpos); 760#endif /* CONFIG_HS20 */ 761 762 if (hapd->conf->vendor_elements) { 763 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements), 764 wpabuf_len(hapd->conf->vendor_elements)); 765 tailpos += wpabuf_len(hapd->conf->vendor_elements); 766 } 767 768 tail_len = tailpos > tail ? tailpos - tail : 0; 769 770 resp = hostapd_probe_resp_offloads(hapd, &resp_len); 771#endif /* NEED_AP_MLME */ 772 773 os_memset(params, 0, sizeof(*params)); 774 params->head = (u8 *) head; 775 params->head_len = head_len; 776 params->tail = tail; 777 params->tail_len = tail_len; 778 params->proberesp = resp; 779 params->proberesp_len = resp_len; 780 params->dtim_period = hapd->conf->dtim_period; 781 params->beacon_int = hapd->iconf->beacon_int; 782 params->basic_rates = hapd->iface->basic_rates; 783 params->ssid = hapd->conf->ssid.ssid; 784 params->ssid_len = hapd->conf->ssid.ssid_len; 785 params->pairwise_ciphers = hapd->conf->rsn_pairwise ? 786 hapd->conf->rsn_pairwise : hapd->conf->wpa_pairwise; 787 params->group_cipher = hapd->conf->wpa_group; 788 params->key_mgmt_suites = hapd->conf->wpa_key_mgmt; 789 params->auth_algs = hapd->conf->auth_algs; 790 params->wpa_version = hapd->conf->wpa; 791 params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa || 792 (hapd->conf->ieee802_1x && 793 (hapd->conf->default_wep_key_len || 794 hapd->conf->individual_wep_key_len)); 795 switch (hapd->conf->ignore_broadcast_ssid) { 796 case 0: 797 params->hide_ssid = NO_SSID_HIDING; 798 break; 799 case 1: 800 params->hide_ssid = HIDDEN_SSID_ZERO_LEN; 801 break; 802 case 2: 803 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS; 804 break; 805 } 806 params->isolate = hapd->conf->isolate; 807#ifdef NEED_AP_MLME 808 params->cts_protect = !!(ieee802_11_erp_info(hapd) & 809 ERP_INFO_USE_PROTECTION); 810 params->preamble = hapd->iface->num_sta_no_short_preamble == 0 && 811 hapd->iconf->preamble == SHORT_PREAMBLE; 812 if (hapd->iface->current_mode && 813 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 814 params->short_slot_time = 815 hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1; 816 else 817 params->short_slot_time = -1; 818 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) 819 params->ht_opmode = -1; 820 else 821 params->ht_opmode = hapd->iface->ht_op_mode; 822#endif /* NEED_AP_MLME */ 823 params->interworking = hapd->conf->interworking; 824 if (hapd->conf->interworking && 825 !is_zero_ether_addr(hapd->conf->hessid)) 826 params->hessid = hapd->conf->hessid; 827 params->access_network_type = hapd->conf->access_network_type; 828 params->ap_max_inactivity = hapd->conf->ap_max_inactivity; 829#ifdef CONFIG_HS20 830 params->disable_dgaf = hapd->conf->disable_dgaf; 831#endif /* CONFIG_HS20 */ 832 return 0; 833} 834 835 836void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params) 837{ 838 os_free(params->tail); 839 params->tail = NULL; 840 os_free(params->head); 841 params->head = NULL; 842 os_free(params->proberesp); 843 params->proberesp = NULL; 844} 845 846 847void ieee802_11_set_beacon(struct hostapd_data *hapd) 848{ 849 struct wpa_driver_ap_params params; 850 struct wpabuf *beacon, *proberesp, *assocresp; 851 852 if (hapd->iface->csa_in_progress) { 853 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period"); 854 return; 855 } 856 857 hapd->beacon_set_done = 1; 858 859 if (ieee802_11_build_ap_params(hapd, ¶ms) < 0) 860 return; 861 862 if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) < 863 0) 864 goto fail; 865 866 params.beacon_ies = beacon; 867 params.proberesp_ies = proberesp; 868 params.assocresp_ies = assocresp; 869 870 if (hostapd_drv_set_ap(hapd, ¶ms)) 871 wpa_printf(MSG_ERROR, "Failed to set beacon parameters"); 872 hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp); 873fail: 874 ieee802_11_free_ap_params(¶ms); 875} 876 877 878void ieee802_11_set_beacons(struct hostapd_iface *iface) 879{ 880 size_t i; 881 for (i = 0; i < iface->num_bss; i++) { 882 if (iface->bss[i]->started) 883 ieee802_11_set_beacon(iface->bss[i]); 884 } 885} 886 887 888/* only update beacons if started */ 889void ieee802_11_update_beacons(struct hostapd_iface *iface) 890{ 891 size_t i; 892 for (i = 0; i < iface->num_bss; i++) 893 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started) 894 ieee802_11_set_beacon(iface->bss[i]); 895} 896 897#endif /* CONFIG_NATIVE_WINDOWS */ 898