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