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