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 "common/hw_features_common.h" 19 #include "wps/wps_defs.h" 20 #include "p2p/p2p.h" 21 #include "hostapd.h" 22 #include "ieee802_11.h" 23 #include "wpa_auth.h" 24 #include "wmm.h" 25 #include "ap_config.h" 26 #include "sta_info.h" 27 #include "p2p_hostapd.h" 28 #include "ap_drv_ops.h" 29 #include "beacon.h" 30 #include "hs20.h" 31 #include "dfs.h" 32 33 34 #ifdef NEED_AP_MLME 35 36 static u8 * hostapd_eid_rm_enabled_capab(struct hostapd_data *hapd, u8 *eid, 37 size_t len) 38 { 39 if (!hapd->conf->radio_measurements || len < 2 + 4) 40 return eid; 41 42 *eid++ = WLAN_EID_RRM_ENABLED_CAPABILITIES; 43 *eid++ = 5; 44 *eid++ = (hapd->conf->radio_measurements & BIT(0)) ? 45 WLAN_RRM_CAPS_NEIGHBOR_REPORT : 0x00; 46 *eid++ = 0x00; 47 *eid++ = 0x00; 48 *eid++ = 0x00; 49 *eid++ = 0x00; 50 return eid; 51 } 52 53 54 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len) 55 { 56 if (len < 2 + 5) 57 return eid; 58 59 #ifdef CONFIG_TESTING_OPTIONS 60 if (hapd->conf->bss_load_test_set) { 61 *eid++ = WLAN_EID_BSS_LOAD; 62 *eid++ = 5; 63 os_memcpy(eid, hapd->conf->bss_load_test, 5); 64 eid += 5; 65 return eid; 66 } 67 #endif /* CONFIG_TESTING_OPTIONS */ 68 if (hapd->conf->bss_load_update_period) { 69 *eid++ = WLAN_EID_BSS_LOAD; 70 *eid++ = 5; 71 WPA_PUT_LE16(eid, hapd->num_sta); 72 eid += 2; 73 *eid++ = hapd->iface->channel_utilization; 74 WPA_PUT_LE16(eid, 0); /* no available admission capabity */ 75 eid += 2; 76 } 77 return eid; 78 } 79 80 81 static u8 ieee802_11_erp_info(struct hostapd_data *hapd) 82 { 83 u8 erp = 0; 84 85 if (hapd->iface->current_mode == NULL || 86 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 87 return 0; 88 89 if (hapd->iface->olbc) 90 erp |= ERP_INFO_USE_PROTECTION; 91 if (hapd->iface->num_sta_non_erp > 0) { 92 erp |= ERP_INFO_NON_ERP_PRESENT | 93 ERP_INFO_USE_PROTECTION; 94 } 95 if (hapd->iface->num_sta_no_short_preamble > 0 || 96 hapd->iconf->preamble == LONG_PREAMBLE) 97 erp |= ERP_INFO_BARKER_PREAMBLE_MODE; 98 99 return erp; 100 } 101 102 103 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid) 104 { 105 *eid++ = WLAN_EID_DS_PARAMS; 106 *eid++ = 1; 107 *eid++ = hapd->iconf->channel; 108 return eid; 109 } 110 111 112 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid) 113 { 114 if (hapd->iface->current_mode == NULL || 115 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 116 return eid; 117 118 /* Set NonERP_present and use_protection bits if there 119 * are any associated NonERP stations. */ 120 /* TODO: use_protection bit can be set to zero even if 121 * there are NonERP stations present. This optimization 122 * might be useful if NonERP stations are "quiet". 123 * See 802.11g/D6 E-1 for recommended practice. 124 * In addition, Non ERP present might be set, if AP detects Non ERP 125 * operation on other APs. */ 126 127 /* Add ERP Information element */ 128 *eid++ = WLAN_EID_ERP_INFO; 129 *eid++ = 1; 130 *eid++ = ieee802_11_erp_info(hapd); 131 132 return eid; 133 } 134 135 136 static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid) 137 { 138 u8 *pos = eid; 139 u8 local_pwr_constraint = 0; 140 int dfs; 141 142 if (hapd->iface->current_mode == NULL || 143 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) 144 return eid; 145 146 /* Let host drivers add this IE if DFS support is offloaded */ 147 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) 148 return eid; 149 150 /* 151 * There is no DFS support and power constraint was not directly 152 * requested by config option. 153 */ 154 if (!hapd->iconf->ieee80211h && 155 hapd->iconf->local_pwr_constraint == -1) 156 return eid; 157 158 /* Check if DFS is required by regulatory. */ 159 dfs = hostapd_is_dfs_required(hapd->iface); 160 if (dfs < 0) { 161 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d", 162 dfs); 163 dfs = 0; 164 } 165 166 if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1) 167 return eid; 168 169 /* 170 * ieee80211h (DFS) is enabled so Power Constraint element shall 171 * be added when running on DFS channel whenever local_pwr_constraint 172 * is configured or not. In order to meet regulations when TPC is not 173 * implemented using a transmit power that is below the legal maximum 174 * (including any mitigation factor) should help. In this case, 175 * indicate 3 dB below maximum allowed transmit power. 176 */ 177 if (hapd->iconf->local_pwr_constraint == -1) 178 local_pwr_constraint = 3; 179 180 /* 181 * A STA that is not an AP shall use a transmit power less than or 182 * equal to the local maximum transmit power level for the channel. 183 * The local maximum transmit power can be calculated from the formula: 184 * local max TX pwr = max TX pwr - local pwr constraint 185 * Where max TX pwr is maximum transmit power level specified for 186 * channel in Country element and local pwr constraint is specified 187 * for channel in this Power Constraint element. 188 */ 189 190 /* Element ID */ 191 *pos++ = WLAN_EID_PWR_CONSTRAINT; 192 /* Length */ 193 *pos++ = 1; 194 /* Local Power Constraint */ 195 if (local_pwr_constraint) 196 *pos++ = local_pwr_constraint; 197 else 198 *pos++ = hapd->iconf->local_pwr_constraint; 199 200 return pos; 201 } 202 203 204 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing, 205 struct hostapd_channel_data *start, 206 struct hostapd_channel_data *prev) 207 { 208 if (end - pos < 3) 209 return pos; 210 211 /* first channel number */ 212 *pos++ = start->chan; 213 /* number of channels */ 214 *pos++ = (prev->chan - start->chan) / chan_spacing + 1; 215 /* maximum transmit power level */ 216 *pos++ = start->max_tx_power; 217 218 return pos; 219 } 220 221 222 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid, 223 int max_len) 224 { 225 u8 *pos = eid; 226 u8 *end = eid + max_len; 227 int i; 228 struct hostapd_hw_modes *mode; 229 struct hostapd_channel_data *start, *prev; 230 int chan_spacing = 1; 231 232 if (!hapd->iconf->ieee80211d || max_len < 6 || 233 hapd->iface->current_mode == NULL) 234 return eid; 235 236 *pos++ = WLAN_EID_COUNTRY; 237 pos++; /* length will be set later */ 238 os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */ 239 pos += 3; 240 241 mode = hapd->iface->current_mode; 242 if (mode->mode == HOSTAPD_MODE_IEEE80211A) 243 chan_spacing = 4; 244 245 start = prev = NULL; 246 for (i = 0; i < mode->num_channels; i++) { 247 struct hostapd_channel_data *chan = &mode->channels[i]; 248 if (chan->flag & HOSTAPD_CHAN_DISABLED) 249 continue; 250 if (start && prev && 251 prev->chan + chan_spacing == chan->chan && 252 start->max_tx_power == chan->max_tx_power) { 253 prev = chan; 254 continue; /* can use same entry */ 255 } 256 257 if (start && prev) { 258 pos = hostapd_eid_country_add(pos, end, chan_spacing, 259 start, prev); 260 start = NULL; 261 } 262 263 /* Start new group */ 264 start = prev = chan; 265 } 266 267 if (start) { 268 pos = hostapd_eid_country_add(pos, end, chan_spacing, 269 start, prev); 270 } 271 272 if ((pos - eid) & 1) { 273 if (end - pos < 1) 274 return eid; 275 *pos++ = 0; /* pad for 16-bit alignment */ 276 } 277 278 eid[1] = (pos - eid) - 2; 279 280 return pos; 281 } 282 283 284 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len) 285 { 286 const u8 *ie; 287 size_t ielen; 288 289 ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen); 290 if (ie == NULL || ielen > len) 291 return eid; 292 293 os_memcpy(eid, ie, ielen); 294 return eid + ielen; 295 } 296 297 298 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid) 299 { 300 u8 chan; 301 302 if (!hapd->cs_freq_params.freq) 303 return eid; 304 305 if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) == 306 NUM_HOSTAPD_MODES) 307 return eid; 308 309 *eid++ = WLAN_EID_CHANNEL_SWITCH; 310 *eid++ = 3; 311 *eid++ = hapd->cs_block_tx; 312 *eid++ = chan; 313 *eid++ = hapd->cs_count; 314 315 return eid; 316 } 317 318 319 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid) 320 { 321 u8 sec_ch; 322 323 if (!hapd->cs_freq_params.sec_channel_offset) 324 return eid; 325 326 if (hapd->cs_freq_params.sec_channel_offset == -1) 327 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW; 328 else if (hapd->cs_freq_params.sec_channel_offset == 1) 329 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE; 330 else 331 return eid; 332 333 *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; 334 *eid++ = 1; 335 *eid++ = sec_ch; 336 337 return eid; 338 } 339 340 341 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos, 342 u8 *start, unsigned int *csa_counter_off) 343 { 344 u8 *old_pos = pos; 345 346 if (!csa_counter_off) 347 return pos; 348 349 *csa_counter_off = 0; 350 pos = hostapd_eid_csa(hapd, pos); 351 352 if (pos != old_pos) { 353 /* save an offset to the counter - should be last byte */ 354 *csa_counter_off = pos - start - 1; 355 pos = hostapd_eid_secondary_channel(hapd, pos); 356 } 357 358 return pos; 359 } 360 361 362 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd, 363 const struct ieee80211_mgmt *req, 364 int is_p2p, size_t *resp_len) 365 { 366 struct ieee80211_mgmt *resp; 367 u8 *pos, *epos; 368 size_t buflen; 369 370 #define MAX_PROBERESP_LEN 768 371 buflen = MAX_PROBERESP_LEN; 372 #ifdef CONFIG_WPS 373 if (hapd->wps_probe_resp_ie) 374 buflen += wpabuf_len(hapd->wps_probe_resp_ie); 375 #endif /* CONFIG_WPS */ 376 #ifdef CONFIG_P2P 377 if (hapd->p2p_probe_resp_ie) 378 buflen += wpabuf_len(hapd->p2p_probe_resp_ie); 379 #endif /* CONFIG_P2P */ 380 if (hapd->conf->vendor_elements) 381 buflen += wpabuf_len(hapd->conf->vendor_elements); 382 if (hapd->conf->vendor_vht) { 383 buflen += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) + 384 2 + sizeof(struct ieee80211_vht_operation); 385 } 386 resp = os_zalloc(buflen); 387 if (resp == NULL) 388 return NULL; 389 390 epos = ((u8 *) resp) + MAX_PROBERESP_LEN; 391 392 resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 393 WLAN_FC_STYPE_PROBE_RESP); 394 if (req) 395 os_memcpy(resp->da, req->sa, ETH_ALEN); 396 os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN); 397 398 os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN); 399 resp->u.probe_resp.beacon_int = 400 host_to_le16(hapd->iconf->beacon_int); 401 402 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 403 resp->u.probe_resp.capab_info = 404 host_to_le16(hostapd_own_capab_info(hapd)); 405 406 pos = resp->u.probe_resp.variable; 407 *pos++ = WLAN_EID_SSID; 408 *pos++ = hapd->conf->ssid.ssid_len; 409 os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len); 410 pos += hapd->conf->ssid.ssid_len; 411 412 /* Supported rates */ 413 pos = hostapd_eid_supp_rates(hapd, pos); 414 415 /* DS Params */ 416 pos = hostapd_eid_ds_params(hapd, pos); 417 418 pos = hostapd_eid_country(hapd, pos, epos - pos); 419 420 /* Power Constraint element */ 421 pos = hostapd_eid_pwr_constraint(hapd, pos); 422 423 /* ERP Information element */ 424 pos = hostapd_eid_erp_info(hapd, pos); 425 426 /* Extended supported rates */ 427 pos = hostapd_eid_ext_supp_rates(hapd, pos); 428 429 /* RSN, MDIE, WPA */ 430 pos = hostapd_eid_wpa(hapd, pos, epos - pos); 431 432 pos = hostapd_eid_bss_load(hapd, pos, epos - pos); 433 434 pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos); 435 436 #ifdef CONFIG_IEEE80211N 437 pos = hostapd_eid_ht_capabilities(hapd, pos); 438 pos = hostapd_eid_ht_operation(hapd, pos); 439 #endif /* CONFIG_IEEE80211N */ 440 441 pos = hostapd_eid_ext_capab(hapd, pos); 442 443 pos = hostapd_eid_time_adv(hapd, pos); 444 pos = hostapd_eid_time_zone(hapd, pos); 445 446 pos = hostapd_eid_interworking(hapd, pos); 447 pos = hostapd_eid_adv_proto(hapd, pos); 448 pos = hostapd_eid_roaming_consortium(hapd, pos); 449 450 pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp, 451 &hapd->cs_c_off_proberesp); 452 #ifdef CONFIG_IEEE80211AC 453 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) { 454 pos = hostapd_eid_vht_capabilities(hapd, pos); 455 pos = hostapd_eid_vht_operation(hapd, pos); 456 } 457 if (hapd->conf->vendor_vht) 458 pos = hostapd_eid_vendor_vht(hapd, pos); 459 #endif /* CONFIG_IEEE80211AC */ 460 461 /* Wi-Fi Alliance WMM */ 462 pos = hostapd_eid_wmm(hapd, pos); 463 464 #ifdef CONFIG_WPS 465 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) { 466 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie), 467 wpabuf_len(hapd->wps_probe_resp_ie)); 468 pos += wpabuf_len(hapd->wps_probe_resp_ie); 469 } 470 #endif /* CONFIG_WPS */ 471 472 #ifdef CONFIG_P2P 473 if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p && 474 hapd->p2p_probe_resp_ie) { 475 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie), 476 wpabuf_len(hapd->p2p_probe_resp_ie)); 477 pos += wpabuf_len(hapd->p2p_probe_resp_ie); 478 } 479 #endif /* CONFIG_P2P */ 480 #ifdef CONFIG_P2P_MANAGER 481 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 482 P2P_MANAGE) 483 pos = hostapd_eid_p2p_manage(hapd, pos); 484 #endif /* CONFIG_P2P_MANAGER */ 485 486 #ifdef CONFIG_HS20 487 pos = hostapd_eid_hs20_indication(hapd, pos); 488 pos = hostapd_eid_osen(hapd, pos); 489 #endif /* CONFIG_HS20 */ 490 491 if (hapd->conf->vendor_elements) { 492 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements), 493 wpabuf_len(hapd->conf->vendor_elements)); 494 pos += wpabuf_len(hapd->conf->vendor_elements); 495 } 496 497 *resp_len = pos - (u8 *) resp; 498 return (u8 *) resp; 499 } 500 501 502 enum ssid_match_result { 503 NO_SSID_MATCH, 504 EXACT_SSID_MATCH, 505 WILDCARD_SSID_MATCH 506 }; 507 508 static enum ssid_match_result ssid_match(struct hostapd_data *hapd, 509 const u8 *ssid, size_t ssid_len, 510 const u8 *ssid_list, 511 size_t ssid_list_len) 512 { 513 const u8 *pos, *end; 514 int wildcard = 0; 515 516 if (ssid_len == 0) 517 wildcard = 1; 518 if (ssid_len == hapd->conf->ssid.ssid_len && 519 os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0) 520 return EXACT_SSID_MATCH; 521 522 if (ssid_list == NULL) 523 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 524 525 pos = ssid_list; 526 end = ssid_list + ssid_list_len; 527 while (pos + 1 <= end) { 528 if (pos + 2 + pos[1] > end) 529 break; 530 if (pos[1] == 0) 531 wildcard = 1; 532 if (pos[1] == hapd->conf->ssid.ssid_len && 533 os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0) 534 return EXACT_SSID_MATCH; 535 pos += 2 + pos[1]; 536 } 537 538 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; 539 } 540 541 542 void handle_probe_req(struct hostapd_data *hapd, 543 const struct ieee80211_mgmt *mgmt, size_t len, 544 int ssi_signal) 545 { 546 u8 *resp; 547 struct ieee802_11_elems elems; 548 const u8 *ie; 549 size_t ie_len; 550 size_t i, resp_len; 551 int noack; 552 enum ssid_match_result res; 553 554 ie = mgmt->u.probe_req.variable; 555 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)) 556 return; 557 ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)); 558 559 for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++) 560 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx, 561 mgmt->sa, mgmt->da, mgmt->bssid, 562 ie, ie_len, ssi_signal) > 0) 563 return; 564 565 if (!hapd->iconf->send_probe_response) 566 return; 567 568 if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) { 569 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR, 570 MAC2STR(mgmt->sa)); 571 return; 572 } 573 574 if ((!elems.ssid || !elems.supp_rates)) { 575 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request " 576 "without SSID or supported rates element", 577 MAC2STR(mgmt->sa)); 578 return; 579 } 580 581 /* 582 * No need to reply if the Probe Request frame was sent on an adjacent 583 * channel. IEEE Std 802.11-2012 describes this as a requirement for an 584 * AP with dot11RadioMeasurementActivated set to true, but strictly 585 * speaking does not allow such ignoring of Probe Request frames if 586 * dot11RadioMeasurementActivated is false. Anyway, this can help reduce 587 * number of unnecessary Probe Response frames for cases where the STA 588 * is less likely to see them (Probe Request frame sent on a 589 * neighboring, but partially overlapping, channel). 590 */ 591 if (elems.ds_params && 592 hapd->iface->current_mode && 593 (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G || 594 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) && 595 hapd->iconf->channel != elems.ds_params[0]) { 596 wpa_printf(MSG_DEBUG, 597 "Ignore Probe Request due to DS Params mismatch: chan=%u != ds.chan=%u", 598 hapd->iconf->channel, elems.ds_params[0]); 599 return; 600 } 601 602 #ifdef CONFIG_P2P 603 if (hapd->p2p && elems.wps_ie) { 604 struct wpabuf *wps; 605 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA); 606 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) { 607 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 608 "due to mismatch with Requested Device " 609 "Type"); 610 wpabuf_free(wps); 611 return; 612 } 613 wpabuf_free(wps); 614 } 615 616 if (hapd->p2p && elems.p2p) { 617 struct wpabuf *p2p; 618 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE); 619 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) { 620 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " 621 "due to mismatch with Device ID"); 622 wpabuf_free(p2p); 623 return; 624 } 625 wpabuf_free(p2p); 626 } 627 #endif /* CONFIG_P2P */ 628 629 if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 && 630 elems.ssid_list_len == 0) { 631 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for " 632 "broadcast SSID ignored", MAC2STR(mgmt->sa)); 633 return; 634 } 635 636 #ifdef CONFIG_P2P 637 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 638 elems.ssid_len == P2P_WILDCARD_SSID_LEN && 639 os_memcmp(elems.ssid, P2P_WILDCARD_SSID, 640 P2P_WILDCARD_SSID_LEN) == 0) { 641 /* Process P2P Wildcard SSID like Wildcard SSID */ 642 elems.ssid_len = 0; 643 } 644 #endif /* CONFIG_P2P */ 645 646 res = ssid_match(hapd, elems.ssid, elems.ssid_len, 647 elems.ssid_list, elems.ssid_list_len); 648 if (res == NO_SSID_MATCH) { 649 if (!(mgmt->da[0] & 0x01)) { 650 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 651 " for foreign SSID '%s' (DA " MACSTR ")%s", 652 MAC2STR(mgmt->sa), 653 wpa_ssid_txt(elems.ssid, elems.ssid_len), 654 MAC2STR(mgmt->da), 655 elems.ssid_list ? " (SSID list)" : ""); 656 } 657 return; 658 } 659 660 #ifdef CONFIG_INTERWORKING 661 if (hapd->conf->interworking && 662 elems.interworking && elems.interworking_len >= 1) { 663 u8 ant = elems.interworking[0] & 0x0f; 664 if (ant != INTERWORKING_ANT_WILDCARD && 665 ant != hapd->conf->access_network_type) { 666 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 667 " for mismatching ANT %u ignored", 668 MAC2STR(mgmt->sa), ant); 669 return; 670 } 671 } 672 673 if (hapd->conf->interworking && elems.interworking && 674 (elems.interworking_len == 7 || elems.interworking_len == 9)) { 675 const u8 *hessid; 676 if (elems.interworking_len == 7) 677 hessid = elems.interworking + 1; 678 else 679 hessid = elems.interworking + 1 + 2; 680 if (!is_broadcast_ether_addr(hessid) && 681 os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) { 682 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR 683 " for mismatching HESSID " MACSTR 684 " ignored", 685 MAC2STR(mgmt->sa), MAC2STR(hessid)); 686 return; 687 } 688 } 689 #endif /* CONFIG_INTERWORKING */ 690 691 #ifdef CONFIG_P2P 692 if ((hapd->conf->p2p & P2P_GROUP_OWNER) && 693 supp_rates_11b_only(&elems)) { 694 /* Indicates support for 11b rates only */ 695 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from " 696 MACSTR " with only 802.11b rates", 697 MAC2STR(mgmt->sa)); 698 return; 699 } 700 #endif /* CONFIG_P2P */ 701 702 /* TODO: verify that supp_rates contains at least one matching rate 703 * with AP configuration */ 704 705 #ifdef CONFIG_TESTING_OPTIONS 706 if (hapd->iconf->ignore_probe_probability > 0.0 && 707 drand48() < hapd->iconf->ignore_probe_probability) { 708 wpa_printf(MSG_INFO, 709 "TESTING: ignoring probe request from " MACSTR, 710 MAC2STR(mgmt->sa)); 711 return; 712 } 713 #endif /* CONFIG_TESTING_OPTIONS */ 714 715 resp = hostapd_gen_probe_resp(hapd, mgmt, elems.p2p != NULL, 716 &resp_len); 717 if (resp == NULL) 718 return; 719 720 /* 721 * If this is a broadcast probe request, apply no ack policy to avoid 722 * excessive retries. 723 */ 724 noack = !!(res == WILDCARD_SSID_MATCH && 725 is_broadcast_ether_addr(mgmt->da)); 726 727 if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0) 728 wpa_printf(MSG_INFO, "handle_probe_req: send failed"); 729 730 os_free(resp); 731 732 wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s " 733 "SSID", MAC2STR(mgmt->sa), 734 elems.ssid_len == 0 ? "broadcast" : "our"); 735 } 736 737 738 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd, 739 size_t *resp_len) 740 { 741 /* check probe response offloading caps and print warnings */ 742 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD)) 743 return NULL; 744 745 #ifdef CONFIG_WPS 746 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie && 747 (!(hapd->iface->probe_resp_offloads & 748 (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS | 749 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2)))) 750 wpa_printf(MSG_WARNING, "Device is trying to offload WPS " 751 "Probe Response while not supporting this"); 752 #endif /* CONFIG_WPS */ 753 754 #ifdef CONFIG_P2P 755 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie && 756 !(hapd->iface->probe_resp_offloads & 757 WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P)) 758 wpa_printf(MSG_WARNING, "Device is trying to offload P2P " 759 "Probe Response while not supporting this"); 760 #endif /* CONFIG_P2P */ 761 762 if (hapd->conf->interworking && 763 !(hapd->iface->probe_resp_offloads & 764 WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING)) 765 wpa_printf(MSG_WARNING, "Device is trying to offload " 766 "Interworking Probe Response while not supporting " 767 "this"); 768 769 /* Generate a Probe Response template for the non-P2P case */ 770 return hostapd_gen_probe_resp(hapd, NULL, 0, resp_len); 771 } 772 773 #endif /* NEED_AP_MLME */ 774 775 776 int ieee802_11_build_ap_params(struct hostapd_data *hapd, 777 struct wpa_driver_ap_params *params) 778 { 779 struct ieee80211_mgmt *head = NULL; 780 u8 *tail = NULL; 781 size_t head_len = 0, tail_len = 0; 782 u8 *resp = NULL; 783 size_t resp_len = 0; 784 #ifdef NEED_AP_MLME 785 u16 capab_info; 786 u8 *pos, *tailpos; 787 788 #define BEACON_HEAD_BUF_SIZE 256 789 #define BEACON_TAIL_BUF_SIZE 512 790 head = os_zalloc(BEACON_HEAD_BUF_SIZE); 791 tail_len = BEACON_TAIL_BUF_SIZE; 792 #ifdef CONFIG_WPS 793 if (hapd->conf->wps_state && hapd->wps_beacon_ie) 794 tail_len += wpabuf_len(hapd->wps_beacon_ie); 795 #endif /* CONFIG_WPS */ 796 #ifdef CONFIG_P2P 797 if (hapd->p2p_beacon_ie) 798 tail_len += wpabuf_len(hapd->p2p_beacon_ie); 799 #endif /* CONFIG_P2P */ 800 if (hapd->conf->vendor_elements) 801 tail_len += wpabuf_len(hapd->conf->vendor_elements); 802 803 #ifdef CONFIG_IEEE80211AC 804 if (hapd->conf->vendor_vht) { 805 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) + 806 2 + sizeof(struct ieee80211_vht_operation); 807 } 808 #endif /* CONFIG_IEEE80211AC */ 809 810 tailpos = tail = os_malloc(tail_len); 811 if (head == NULL || tail == NULL) { 812 wpa_printf(MSG_ERROR, "Failed to set beacon data"); 813 os_free(head); 814 os_free(tail); 815 return -1; 816 } 817 818 head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, 819 WLAN_FC_STYPE_BEACON); 820 head->duration = host_to_le16(0); 821 os_memset(head->da, 0xff, ETH_ALEN); 822 823 os_memcpy(head->sa, hapd->own_addr, ETH_ALEN); 824 os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN); 825 head->u.beacon.beacon_int = 826 host_to_le16(hapd->iconf->beacon_int); 827 828 /* hardware or low-level driver will setup seq_ctrl and timestamp */ 829 capab_info = hostapd_own_capab_info(hapd); 830 head->u.beacon.capab_info = host_to_le16(capab_info); 831 pos = &head->u.beacon.variable[0]; 832 833 /* SSID */ 834 *pos++ = WLAN_EID_SSID; 835 if (hapd->conf->ignore_broadcast_ssid == 2) { 836 /* clear the data, but keep the correct length of the SSID */ 837 *pos++ = hapd->conf->ssid.ssid_len; 838 os_memset(pos, 0, hapd->conf->ssid.ssid_len); 839 pos += hapd->conf->ssid.ssid_len; 840 } else if (hapd->conf->ignore_broadcast_ssid) { 841 *pos++ = 0; /* empty SSID */ 842 } else { 843 *pos++ = hapd->conf->ssid.ssid_len; 844 os_memcpy(pos, hapd->conf->ssid.ssid, 845 hapd->conf->ssid.ssid_len); 846 pos += hapd->conf->ssid.ssid_len; 847 } 848 849 /* Supported rates */ 850 pos = hostapd_eid_supp_rates(hapd, pos); 851 852 /* DS Params */ 853 pos = hostapd_eid_ds_params(hapd, pos); 854 855 head_len = pos - (u8 *) head; 856 857 tailpos = hostapd_eid_country(hapd, tailpos, 858 tail + BEACON_TAIL_BUF_SIZE - tailpos); 859 860 /* Power Constraint element */ 861 tailpos = hostapd_eid_pwr_constraint(hapd, tailpos); 862 863 /* ERP Information element */ 864 tailpos = hostapd_eid_erp_info(hapd, tailpos); 865 866 /* Extended supported rates */ 867 tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos); 868 869 /* RSN, MDIE, WPA */ 870 tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - 871 tailpos); 872 873 tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos, 874 tail + BEACON_TAIL_BUF_SIZE - 875 tailpos); 876 877 tailpos = hostapd_eid_bss_load(hapd, tailpos, 878 tail + BEACON_TAIL_BUF_SIZE - tailpos); 879 880 #ifdef CONFIG_IEEE80211N 881 tailpos = hostapd_eid_ht_capabilities(hapd, tailpos); 882 tailpos = hostapd_eid_ht_operation(hapd, tailpos); 883 #endif /* CONFIG_IEEE80211N */ 884 885 tailpos = hostapd_eid_ext_capab(hapd, tailpos); 886 887 /* 888 * TODO: Time Advertisement element should only be included in some 889 * DTIM Beacon frames. 890 */ 891 tailpos = hostapd_eid_time_adv(hapd, tailpos); 892 893 tailpos = hostapd_eid_interworking(hapd, tailpos); 894 tailpos = hostapd_eid_adv_proto(hapd, tailpos); 895 tailpos = hostapd_eid_roaming_consortium(hapd, tailpos); 896 tailpos = hostapd_add_csa_elems(hapd, tailpos, tail, 897 &hapd->cs_c_off_beacon); 898 #ifdef CONFIG_IEEE80211AC 899 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) { 900 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos); 901 tailpos = hostapd_eid_vht_operation(hapd, tailpos); 902 } 903 if (hapd->conf->vendor_vht) 904 tailpos = hostapd_eid_vendor_vht(hapd, tailpos); 905 #endif /* CONFIG_IEEE80211AC */ 906 907 /* Wi-Fi Alliance WMM */ 908 tailpos = hostapd_eid_wmm(hapd, tailpos); 909 910 #ifdef CONFIG_WPS 911 if (hapd->conf->wps_state && hapd->wps_beacon_ie) { 912 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie), 913 wpabuf_len(hapd->wps_beacon_ie)); 914 tailpos += wpabuf_len(hapd->wps_beacon_ie); 915 } 916 #endif /* CONFIG_WPS */ 917 918 #ifdef CONFIG_P2P 919 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) { 920 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie), 921 wpabuf_len(hapd->p2p_beacon_ie)); 922 tailpos += wpabuf_len(hapd->p2p_beacon_ie); 923 } 924 #endif /* CONFIG_P2P */ 925 #ifdef CONFIG_P2P_MANAGER 926 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == 927 P2P_MANAGE) 928 tailpos = hostapd_eid_p2p_manage(hapd, tailpos); 929 #endif /* CONFIG_P2P_MANAGER */ 930 931 #ifdef CONFIG_HS20 932 tailpos = hostapd_eid_hs20_indication(hapd, tailpos); 933 tailpos = hostapd_eid_osen(hapd, tailpos); 934 #endif /* CONFIG_HS20 */ 935 936 if (hapd->conf->vendor_elements) { 937 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements), 938 wpabuf_len(hapd->conf->vendor_elements)); 939 tailpos += wpabuf_len(hapd->conf->vendor_elements); 940 } 941 942 tail_len = tailpos > tail ? tailpos - tail : 0; 943 944 resp = hostapd_probe_resp_offloads(hapd, &resp_len); 945 #endif /* NEED_AP_MLME */ 946 947 os_memset(params, 0, sizeof(*params)); 948 params->head = (u8 *) head; 949 params->head_len = head_len; 950 params->tail = tail; 951 params->tail_len = tail_len; 952 params->proberesp = resp; 953 params->proberesp_len = resp_len; 954 params->dtim_period = hapd->conf->dtim_period; 955 params->beacon_int = hapd->iconf->beacon_int; 956 params->basic_rates = hapd->iface->basic_rates; 957 params->ssid = hapd->conf->ssid.ssid; 958 params->ssid_len = hapd->conf->ssid.ssid_len; 959 if ((hapd->conf->wpa & (WPA_PROTO_WPA | WPA_PROTO_RSN)) == 960 (WPA_PROTO_WPA | WPA_PROTO_RSN)) 961 params->pairwise_ciphers = hapd->conf->wpa_pairwise | 962 hapd->conf->rsn_pairwise; 963 else if (hapd->conf->wpa & WPA_PROTO_RSN) 964 params->pairwise_ciphers = hapd->conf->rsn_pairwise; 965 else if (hapd->conf->wpa & WPA_PROTO_WPA) 966 params->pairwise_ciphers = hapd->conf->wpa_pairwise; 967 params->group_cipher = hapd->conf->wpa_group; 968 params->key_mgmt_suites = hapd->conf->wpa_key_mgmt; 969 params->auth_algs = hapd->conf->auth_algs; 970 params->wpa_version = hapd->conf->wpa; 971 params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa || 972 (hapd->conf->ieee802_1x && 973 (hapd->conf->default_wep_key_len || 974 hapd->conf->individual_wep_key_len)); 975 switch (hapd->conf->ignore_broadcast_ssid) { 976 case 0: 977 params->hide_ssid = NO_SSID_HIDING; 978 break; 979 case 1: 980 params->hide_ssid = HIDDEN_SSID_ZERO_LEN; 981 break; 982 case 2: 983 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS; 984 break; 985 } 986 params->isolate = hapd->conf->isolate; 987 params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK; 988 #ifdef NEED_AP_MLME 989 params->cts_protect = !!(ieee802_11_erp_info(hapd) & 990 ERP_INFO_USE_PROTECTION); 991 params->preamble = hapd->iface->num_sta_no_short_preamble == 0 && 992 hapd->iconf->preamble == SHORT_PREAMBLE; 993 if (hapd->iface->current_mode && 994 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 995 params->short_slot_time = 996 hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1; 997 else 998 params->short_slot_time = -1; 999 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) 1000 params->ht_opmode = -1; 1001 else 1002 params->ht_opmode = hapd->iface->ht_op_mode; 1003 #endif /* NEED_AP_MLME */ 1004 params->interworking = hapd->conf->interworking; 1005 if (hapd->conf->interworking && 1006 !is_zero_ether_addr(hapd->conf->hessid)) 1007 params->hessid = hapd->conf->hessid; 1008 params->access_network_type = hapd->conf->access_network_type; 1009 params->ap_max_inactivity = hapd->conf->ap_max_inactivity; 1010 #ifdef CONFIG_P2P 1011 params->p2p_go_ctwindow = hapd->iconf->p2p_go_ctwindow; 1012 #endif /* CONFIG_P2P */ 1013 #ifdef CONFIG_HS20 1014 params->disable_dgaf = hapd->conf->disable_dgaf; 1015 if (hapd->conf->osen) { 1016 params->privacy = 1; 1017 params->osen = 1; 1018 } 1019 #endif /* CONFIG_HS20 */ 1020 return 0; 1021 } 1022 1023 1024 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params) 1025 { 1026 os_free(params->tail); 1027 params->tail = NULL; 1028 os_free(params->head); 1029 params->head = NULL; 1030 os_free(params->proberesp); 1031 params->proberesp = NULL; 1032 } 1033 1034 1035 int ieee802_11_set_beacon(struct hostapd_data *hapd) 1036 { 1037 struct wpa_driver_ap_params params; 1038 struct hostapd_freq_params freq; 1039 struct hostapd_iface *iface = hapd->iface; 1040 struct hostapd_config *iconf = iface->conf; 1041 struct wpabuf *beacon, *proberesp, *assocresp; 1042 int res, ret = -1; 1043 1044 if (hapd->csa_in_progress) { 1045 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period"); 1046 return -1; 1047 } 1048 1049 hapd->beacon_set_done = 1; 1050 1051 if (ieee802_11_build_ap_params(hapd, ¶ms) < 0) 1052 return -1; 1053 1054 if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) < 1055 0) 1056 goto fail; 1057 1058 params.beacon_ies = beacon; 1059 params.proberesp_ies = proberesp; 1060 params.assocresp_ies = assocresp; 1061 params.reenable = hapd->reenable_beacon; 1062 hapd->reenable_beacon = 0; 1063 1064 if (iface->current_mode && 1065 hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq, 1066 iconf->channel, iconf->ieee80211n, 1067 iconf->ieee80211ac, 1068 iconf->secondary_channel, 1069 iconf->vht_oper_chwidth, 1070 iconf->vht_oper_centr_freq_seg0_idx, 1071 iconf->vht_oper_centr_freq_seg1_idx, 1072 iface->current_mode->vht_capab) == 0) 1073 params.freq = &freq; 1074 1075 res = hostapd_drv_set_ap(hapd, ¶ms); 1076 hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp); 1077 if (res) 1078 wpa_printf(MSG_ERROR, "Failed to set beacon parameters"); 1079 else 1080 ret = 0; 1081 fail: 1082 ieee802_11_free_ap_params(¶ms); 1083 return ret; 1084 } 1085 1086 1087 int ieee802_11_set_beacons(struct hostapd_iface *iface) 1088 { 1089 size_t i; 1090 int ret = 0; 1091 1092 for (i = 0; i < iface->num_bss; i++) { 1093 if (iface->bss[i]->started && 1094 ieee802_11_set_beacon(iface->bss[i]) < 0) 1095 ret = -1; 1096 } 1097 1098 return ret; 1099 } 1100 1101 1102 /* only update beacons if started */ 1103 int ieee802_11_update_beacons(struct hostapd_iface *iface) 1104 { 1105 size_t i; 1106 int ret = 0; 1107 1108 for (i = 0; i < iface->num_bss; i++) { 1109 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started && 1110 ieee802_11_set_beacon(iface->bss[i]) < 0) 1111 ret = -1; 1112 } 1113 1114 return ret; 1115 } 1116 1117 #endif /* CONFIG_NATIVE_WINDOWS */ 1118
