1 /* 2 * hostapd / Hardware feature query and different modes 3 * Copyright 2002-2003, Instant802 Networks, Inc. 4 * Copyright 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 #include "utils/common.h" 14 #include "utils/eloop.h" 15 #include "common/ieee802_11_defs.h" 16 #include "common/ieee802_11_common.h" 17 #include "common/wpa_ctrl.h" 18 #include "common/hw_features_common.h" 19 #include "hostapd.h" 20 #include "ap_config.h" 21 #include "ap_drv_ops.h" 22 #include "acs.h" 23 #include "ieee802_11.h" 24 #include "beacon.h" 25 #include "hw_features.h" 26 27 28 void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features, 29 size_t num_hw_features) 30 { 31 size_t i; 32 33 if (hw_features == NULL) 34 return; 35 36 for (i = 0; i < num_hw_features; i++) { 37 os_free(hw_features[i].channels); 38 os_free(hw_features[i].rates); 39 } 40 41 os_free(hw_features); 42 } 43 44 45 #ifndef CONFIG_NO_STDOUT_DEBUG 46 static char * dfs_info(struct hostapd_channel_data *chan) 47 { 48 static char info[256]; 49 char *state; 50 51 switch (chan->flag & HOSTAPD_CHAN_DFS_MASK) { 52 case HOSTAPD_CHAN_DFS_UNKNOWN: 53 state = "unknown"; 54 break; 55 case HOSTAPD_CHAN_DFS_USABLE: 56 state = "usable"; 57 break; 58 case HOSTAPD_CHAN_DFS_UNAVAILABLE: 59 state = "unavailable"; 60 break; 61 case HOSTAPD_CHAN_DFS_AVAILABLE: 62 state = "available"; 63 break; 64 default: 65 return ""; 66 } 67 os_snprintf(info, sizeof(info), " (DFS state = %s)", state); 68 info[sizeof(info) - 1] = '\0'; 69 70 return info; 71 } 72 #endif /* CONFIG_NO_STDOUT_DEBUG */ 73 74 75 int hostapd_get_hw_features(struct hostapd_iface *iface) 76 { 77 struct hostapd_data *hapd = iface->bss[0]; 78 int i, j; 79 u16 num_modes, flags; 80 struct hostapd_hw_modes *modes; 81 82 if (hostapd_drv_none(hapd)) 83 return -1; 84 modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags); 85 if (modes == NULL) { 86 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211, 87 HOSTAPD_LEVEL_DEBUG, 88 "Fetching hardware channel/rate support not " 89 "supported."); 90 return -1; 91 } 92 93 iface->hw_flags = flags; 94 95 hostapd_free_hw_features(iface->hw_features, iface->num_hw_features); 96 iface->hw_features = modes; 97 iface->num_hw_features = num_modes; 98 99 for (i = 0; i < num_modes; i++) { 100 struct hostapd_hw_modes *feature = &modes[i]; 101 int dfs_enabled = hapd->iconf->ieee80211h && 102 (iface->drv_flags & WPA_DRIVER_FLAGS_RADAR); 103 104 /* set flag for channels we can use in current regulatory 105 * domain */ 106 for (j = 0; j < feature->num_channels; j++) { 107 int dfs = 0; 108 109 /* 110 * Disable all channels that are marked not to allow 111 * to initiate radiation (a.k.a. passive scan and no 112 * IBSS). 113 * Use radar channels only if the driver supports DFS. 114 */ 115 if ((feature->channels[j].flag & 116 HOSTAPD_CHAN_RADAR) && dfs_enabled) { 117 dfs = 1; 118 } else if (((feature->channels[j].flag & 119 HOSTAPD_CHAN_RADAR) && 120 !(iface->drv_flags & 121 WPA_DRIVER_FLAGS_DFS_OFFLOAD)) || 122 (feature->channels[j].flag & 123 HOSTAPD_CHAN_NO_IR)) { 124 feature->channels[j].flag |= 125 HOSTAPD_CHAN_DISABLED; 126 } 127 128 if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED) 129 continue; 130 131 wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d " 132 "chan=%d freq=%d MHz max_tx_power=%d dBm%s", 133 feature->mode, 134 feature->channels[j].chan, 135 feature->channels[j].freq, 136 feature->channels[j].max_tx_power, 137 dfs ? dfs_info(&feature->channels[j]) : ""); 138 } 139 } 140 141 return 0; 142 } 143 144 145 int hostapd_prepare_rates(struct hostapd_iface *iface, 146 struct hostapd_hw_modes *mode) 147 { 148 int i, num_basic_rates = 0; 149 int basic_rates_a[] = { 60, 120, 240, -1 }; 150 int basic_rates_b[] = { 10, 20, -1 }; 151 int basic_rates_g[] = { 10, 20, 55, 110, -1 }; 152 int *basic_rates; 153 154 if (iface->conf->basic_rates) 155 basic_rates = iface->conf->basic_rates; 156 else switch (mode->mode) { 157 case HOSTAPD_MODE_IEEE80211A: 158 basic_rates = basic_rates_a; 159 break; 160 case HOSTAPD_MODE_IEEE80211B: 161 basic_rates = basic_rates_b; 162 break; 163 case HOSTAPD_MODE_IEEE80211G: 164 basic_rates = basic_rates_g; 165 break; 166 case HOSTAPD_MODE_IEEE80211AD: 167 return 0; /* No basic rates for 11ad */ 168 default: 169 return -1; 170 } 171 172 i = 0; 173 while (basic_rates[i] >= 0) 174 i++; 175 if (i) 176 i++; /* -1 termination */ 177 os_free(iface->basic_rates); 178 iface->basic_rates = os_malloc(i * sizeof(int)); 179 if (iface->basic_rates) 180 os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int)); 181 182 os_free(iface->current_rates); 183 iface->num_rates = 0; 184 185 iface->current_rates = 186 os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data)); 187 if (!iface->current_rates) { 188 wpa_printf(MSG_ERROR, "Failed to allocate memory for rate " 189 "table."); 190 return -1; 191 } 192 193 for (i = 0; i < mode->num_rates; i++) { 194 struct hostapd_rate_data *rate; 195 196 if (iface->conf->supported_rates && 197 !hostapd_rate_found(iface->conf->supported_rates, 198 mode->rates[i])) 199 continue; 200 201 rate = &iface->current_rates[iface->num_rates]; 202 rate->rate = mode->rates[i]; 203 if (hostapd_rate_found(basic_rates, rate->rate)) { 204 rate->flags |= HOSTAPD_RATE_BASIC; 205 num_basic_rates++; 206 } 207 wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x", 208 iface->num_rates, rate->rate, rate->flags); 209 iface->num_rates++; 210 } 211 212 if ((iface->num_rates == 0 || num_basic_rates == 0) && 213 (!iface->conf->ieee80211n || !iface->conf->require_ht)) { 214 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic " 215 "rate sets (%d,%d).", 216 iface->num_rates, num_basic_rates); 217 return -1; 218 } 219 220 return 0; 221 } 222 223 224 #ifdef CONFIG_IEEE80211N 225 static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface) 226 { 227 int pri_chan, sec_chan; 228 229 if (!iface->conf->secondary_channel) 230 return 1; /* HT40 not used */ 231 232 pri_chan = iface->conf->channel; 233 sec_chan = pri_chan + iface->conf->secondary_channel * 4; 234 235 return allowed_ht40_channel_pair(iface->current_mode, pri_chan, 236 sec_chan); 237 } 238 239 240 static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface) 241 { 242 if (iface->conf->secondary_channel > 0) { 243 iface->conf->channel += 4; 244 iface->conf->secondary_channel = -1; 245 } else { 246 iface->conf->channel -= 4; 247 iface->conf->secondary_channel = 1; 248 } 249 } 250 251 252 static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface, 253 struct wpa_scan_results *scan_res) 254 { 255 int pri_chan, sec_chan; 256 int res; 257 258 pri_chan = iface->conf->channel; 259 sec_chan = pri_chan + iface->conf->secondary_channel * 4; 260 261 res = check_40mhz_5g(iface->current_mode, scan_res, pri_chan, sec_chan); 262 263 if (res == 2) { 264 if (iface->conf->no_pri_sec_switch) { 265 wpa_printf(MSG_DEBUG, 266 "Cannot switch PRI/SEC channels due to local constraint"); 267 } else { 268 ieee80211n_switch_pri_sec(iface); 269 } 270 } 271 272 return !!res; 273 } 274 275 276 static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface, 277 struct wpa_scan_results *scan_res) 278 { 279 int pri_chan, sec_chan; 280 281 pri_chan = iface->conf->channel; 282 sec_chan = pri_chan + iface->conf->secondary_channel * 4; 283 284 return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan, 285 sec_chan); 286 } 287 288 289 static void ieee80211n_check_scan(struct hostapd_iface *iface) 290 { 291 struct wpa_scan_results *scan_res; 292 int oper40; 293 int res; 294 295 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is 296 * allowed per IEEE Std 802.11-2012, 10.15.3.2 */ 297 298 iface->scan_cb = NULL; 299 300 scan_res = hostapd_driver_get_scan_results(iface->bss[0]); 301 if (scan_res == NULL) { 302 hostapd_setup_interface_complete(iface, 1); 303 return; 304 } 305 306 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A) 307 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res); 308 else 309 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res); 310 wpa_scan_results_free(scan_res); 311 312 iface->secondary_ch = iface->conf->secondary_channel; 313 if (!oper40) { 314 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on " 315 "channel pri=%d sec=%d based on overlapping BSSes", 316 iface->conf->channel, 317 iface->conf->channel + 318 iface->conf->secondary_channel * 4); 319 iface->conf->secondary_channel = 0; 320 if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) { 321 /* 322 * TODO: Could consider scheduling another scan to check 323 * if channel width can be changed if no coex reports 324 * are received from associating stations. 325 */ 326 } 327 } 328 329 res = ieee80211n_allowed_ht40_channel_pair(iface); 330 if (!res) { 331 iface->conf->secondary_channel = 0; 332 iface->conf->vht_oper_centr_freq_seg0_idx = 0; 333 iface->conf->vht_oper_centr_freq_seg1_idx = 0; 334 res = 1; 335 wpa_printf(MSG_INFO, "Fallback to 20 MHz"); 336 } 337 338 hostapd_setup_interface_complete(iface, !res); 339 } 340 341 342 static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface, 343 struct wpa_driver_scan_params *params) 344 { 345 /* Scan only the affected frequency range */ 346 int pri_freq, sec_freq; 347 int affected_start, affected_end; 348 int i, pos; 349 struct hostapd_hw_modes *mode; 350 351 if (iface->current_mode == NULL) 352 return; 353 354 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 355 if (iface->conf->secondary_channel > 0) 356 sec_freq = pri_freq + 20; 357 else 358 sec_freq = pri_freq - 20; 359 /* 360 * Note: Need to find the PRI channel also in cases where the affected 361 * channel is the SEC channel of a 40 MHz BSS, so need to include the 362 * scanning coverage here to be 40 MHz from the center frequency. 363 */ 364 affected_start = (pri_freq + sec_freq) / 2 - 40; 365 affected_end = (pri_freq + sec_freq) / 2 + 40; 366 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 367 affected_start, affected_end); 368 369 mode = iface->current_mode; 370 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); 371 if (params->freqs == NULL) 372 return; 373 pos = 0; 374 375 for (i = 0; i < mode->num_channels; i++) { 376 struct hostapd_channel_data *chan = &mode->channels[i]; 377 if (chan->flag & HOSTAPD_CHAN_DISABLED) 378 continue; 379 if (chan->freq < affected_start || 380 chan->freq > affected_end) 381 continue; 382 params->freqs[pos++] = chan->freq; 383 } 384 } 385 386 387 static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface, 388 struct wpa_driver_scan_params *params) 389 { 390 /* Scan only the affected frequency range */ 391 int pri_freq; 392 int affected_start, affected_end; 393 int i, pos; 394 struct hostapd_hw_modes *mode; 395 396 if (iface->current_mode == NULL) 397 return; 398 399 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 400 if (iface->conf->secondary_channel > 0) { 401 affected_start = pri_freq - 10; 402 affected_end = pri_freq + 30; 403 } else { 404 affected_start = pri_freq - 30; 405 affected_end = pri_freq + 10; 406 } 407 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 408 affected_start, affected_end); 409 410 mode = iface->current_mode; 411 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); 412 if (params->freqs == NULL) 413 return; 414 pos = 0; 415 416 for (i = 0; i < mode->num_channels; i++) { 417 struct hostapd_channel_data *chan = &mode->channels[i]; 418 if (chan->flag & HOSTAPD_CHAN_DISABLED) 419 continue; 420 if (chan->freq < affected_start || 421 chan->freq > affected_end) 422 continue; 423 params->freqs[pos++] = chan->freq; 424 } 425 } 426 427 428 static void ap_ht40_scan_retry(void *eloop_data, void *user_data) 429 { 430 #define HT2040_COEX_SCAN_RETRY 15 431 struct hostapd_iface *iface = eloop_data; 432 struct wpa_driver_scan_params params; 433 int ret; 434 435 os_memset(¶ms, 0, sizeof(params)); 436 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 437 ieee80211n_scan_channels_2g4(iface, ¶ms); 438 else 439 ieee80211n_scan_channels_5g(iface, ¶ms); 440 441 ret = hostapd_driver_scan(iface->bss[0], ¶ms); 442 iface->num_ht40_scan_tries++; 443 os_free(params.freqs); 444 445 if (ret == -EBUSY && 446 iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) { 447 wpa_printf(MSG_ERROR, 448 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)", 449 ret, strerror(-ret), iface->num_ht40_scan_tries); 450 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); 451 return; 452 } 453 454 if (ret == 0) { 455 iface->scan_cb = ieee80211n_check_scan; 456 return; 457 } 458 459 wpa_printf(MSG_DEBUG, 460 "Failed to request a scan in device, bringing up in HT20 mode"); 461 iface->conf->secondary_channel = 0; 462 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET; 463 hostapd_setup_interface_complete(iface, 0); 464 } 465 466 467 void hostapd_stop_setup_timers(struct hostapd_iface *iface) 468 { 469 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); 470 } 471 472 473 static int ieee80211n_check_40mhz(struct hostapd_iface *iface) 474 { 475 struct wpa_driver_scan_params params; 476 int ret; 477 478 /* Check that HT40 is used and PRI / SEC switch is allowed */ 479 if (!iface->conf->secondary_channel || iface->conf->no_pri_sec_switch) 480 return 0; 481 482 hostapd_set_state(iface, HAPD_IFACE_HT_SCAN); 483 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling " 484 "40 MHz channel"); 485 os_memset(¶ms, 0, sizeof(params)); 486 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 487 ieee80211n_scan_channels_2g4(iface, ¶ms); 488 else 489 ieee80211n_scan_channels_5g(iface, ¶ms); 490 491 ret = hostapd_driver_scan(iface->bss[0], ¶ms); 492 os_free(params.freqs); 493 494 if (ret == -EBUSY) { 495 wpa_printf(MSG_ERROR, 496 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again", 497 ret, strerror(-ret)); 498 iface->num_ht40_scan_tries = 1; 499 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); 500 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); 501 return 1; 502 } 503 504 if (ret < 0) { 505 wpa_printf(MSG_ERROR, 506 "Failed to request a scan of neighboring BSSes ret=%d (%s)", 507 ret, strerror(-ret)); 508 return -1; 509 } 510 511 iface->scan_cb = ieee80211n_check_scan; 512 return 1; 513 } 514 515 516 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface) 517 { 518 u16 hw = iface->current_mode->ht_capab; 519 u16 conf = iface->conf->ht_capab; 520 521 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) && 522 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) { 523 wpa_printf(MSG_ERROR, "Driver does not support configured " 524 "HT capability [LDPC]"); 525 return 0; 526 } 527 528 /* 529 * Driver ACS chosen channel may not be HT40 due to internal driver 530 * restrictions. 531 */ 532 if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) && 533 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) { 534 wpa_printf(MSG_ERROR, "Driver does not support configured " 535 "HT capability [HT40*]"); 536 return 0; 537 } 538 539 switch (conf & HT_CAP_INFO_SMPS_MASK) { 540 case HT_CAP_INFO_SMPS_STATIC: 541 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_STATIC)) { 542 wpa_printf(MSG_ERROR, 543 "Driver does not support configured HT capability [SMPS-STATIC]"); 544 return 0; 545 } 546 break; 547 case HT_CAP_INFO_SMPS_DYNAMIC: 548 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_DYNAMIC)) { 549 wpa_printf(MSG_ERROR, 550 "Driver does not support configured HT capability [SMPS-DYNAMIC]"); 551 return 0; 552 } 553 break; 554 case HT_CAP_INFO_SMPS_DISABLED: 555 default: 556 break; 557 } 558 559 if ((conf & HT_CAP_INFO_GREEN_FIELD) && 560 !(hw & HT_CAP_INFO_GREEN_FIELD)) { 561 wpa_printf(MSG_ERROR, "Driver does not support configured " 562 "HT capability [GF]"); 563 return 0; 564 } 565 566 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) && 567 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) { 568 wpa_printf(MSG_ERROR, "Driver does not support configured " 569 "HT capability [SHORT-GI-20]"); 570 return 0; 571 } 572 573 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) && 574 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) { 575 wpa_printf(MSG_ERROR, "Driver does not support configured " 576 "HT capability [SHORT-GI-40]"); 577 return 0; 578 } 579 580 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) { 581 wpa_printf(MSG_ERROR, "Driver does not support configured " 582 "HT capability [TX-STBC]"); 583 return 0; 584 } 585 586 if ((conf & HT_CAP_INFO_RX_STBC_MASK) > 587 (hw & HT_CAP_INFO_RX_STBC_MASK)) { 588 wpa_printf(MSG_ERROR, "Driver does not support configured " 589 "HT capability [RX-STBC*]"); 590 return 0; 591 } 592 593 if ((conf & HT_CAP_INFO_DELAYED_BA) && 594 !(hw & HT_CAP_INFO_DELAYED_BA)) { 595 wpa_printf(MSG_ERROR, "Driver does not support configured " 596 "HT capability [DELAYED-BA]"); 597 return 0; 598 } 599 600 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) && 601 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) { 602 wpa_printf(MSG_ERROR, "Driver does not support configured " 603 "HT capability [MAX-AMSDU-7935]"); 604 return 0; 605 } 606 607 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) && 608 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) { 609 wpa_printf(MSG_ERROR, "Driver does not support configured " 610 "HT capability [DSSS_CCK-40]"); 611 return 0; 612 } 613 614 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) && 615 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) { 616 wpa_printf(MSG_ERROR, "Driver does not support configured " 617 "HT capability [LSIG-TXOP-PROT]"); 618 return 0; 619 } 620 621 return 1; 622 } 623 624 625 #ifdef CONFIG_IEEE80211AC 626 static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface) 627 { 628 struct hostapd_hw_modes *mode = iface->current_mode; 629 u32 hw = mode->vht_capab; 630 u32 conf = iface->conf->vht_capab; 631 632 wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x", 633 hw, conf); 634 635 if (mode->mode == HOSTAPD_MODE_IEEE80211G && 636 iface->conf->bss[0]->vendor_vht && 637 mode->vht_capab == 0 && iface->hw_features) { 638 int i; 639 640 for (i = 0; i < iface->num_hw_features; i++) { 641 if (iface->hw_features[i].mode == 642 HOSTAPD_MODE_IEEE80211A) { 643 mode = &iface->hw_features[i]; 644 hw = mode->vht_capab; 645 wpa_printf(MSG_DEBUG, 646 "update hw vht capab based on 5 GHz band: 0x%x", 647 hw); 648 break; 649 } 650 } 651 } 652 653 return ieee80211ac_cap_check(hw, conf); 654 } 655 #endif /* CONFIG_IEEE80211AC */ 656 657 #endif /* CONFIG_IEEE80211N */ 658 659 660 int hostapd_check_ht_capab(struct hostapd_iface *iface) 661 { 662 #ifdef CONFIG_IEEE80211N 663 int ret; 664 if (!iface->conf->ieee80211n) 665 return 0; 666 667 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B && 668 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G && 669 (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) { 670 wpa_printf(MSG_DEBUG, 671 "Disable HT capability [DSSS_CCK-40] on 5 GHz band"); 672 iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ; 673 } 674 675 if (!ieee80211n_supported_ht_capab(iface)) 676 return -1; 677 #ifdef CONFIG_IEEE80211AC 678 if (!ieee80211ac_supported_vht_capab(iface)) 679 return -1; 680 #endif /* CONFIG_IEEE80211AC */ 681 ret = ieee80211n_check_40mhz(iface); 682 if (ret) 683 return ret; 684 if (!ieee80211n_allowed_ht40_channel_pair(iface)) 685 return -1; 686 #endif /* CONFIG_IEEE80211N */ 687 688 return 0; 689 } 690 691 692 static int hostapd_is_usable_chan(struct hostapd_iface *iface, 693 int channel, int primary) 694 { 695 int i; 696 struct hostapd_channel_data *chan; 697 698 if (!iface->current_mode) 699 return 0; 700 701 for (i = 0; i < iface->current_mode->num_channels; i++) { 702 chan = &iface->current_mode->channels[i]; 703 if (chan->chan != channel) 704 continue; 705 706 if (!(chan->flag & HOSTAPD_CHAN_DISABLED)) 707 return 1; 708 709 wpa_printf(MSG_DEBUG, 710 "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s", 711 primary ? "" : "Configured HT40 secondary ", 712 i, chan->chan, chan->flag, 713 chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "", 714 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : ""); 715 } 716 717 wpa_printf(MSG_INFO, "Channel %d (%s) not allowed for AP mode", 718 channel, primary ? "primary" : "secondary"); 719 return 0; 720 } 721 722 723 static int hostapd_is_usable_chans(struct hostapd_iface *iface) 724 { 725 if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1)) 726 return 0; 727 728 if (!iface->conf->secondary_channel) 729 return 1; 730 731 return hostapd_is_usable_chan(iface, iface->conf->channel + 732 iface->conf->secondary_channel * 4, 0); 733 } 734 735 736 static enum hostapd_chan_status 737 hostapd_check_chans(struct hostapd_iface *iface) 738 { 739 if (iface->conf->channel) { 740 if (hostapd_is_usable_chans(iface)) 741 return HOSTAPD_CHAN_VALID; 742 else 743 return HOSTAPD_CHAN_INVALID; 744 } 745 746 /* 747 * The user set channel=0 or channel=acs_survey 748 * which is used to trigger ACS. 749 */ 750 751 switch (acs_init(iface)) { 752 case HOSTAPD_CHAN_ACS: 753 return HOSTAPD_CHAN_ACS; 754 case HOSTAPD_CHAN_VALID: 755 case HOSTAPD_CHAN_INVALID: 756 default: 757 return HOSTAPD_CHAN_INVALID; 758 } 759 } 760 761 762 static void hostapd_notify_bad_chans(struct hostapd_iface *iface) 763 { 764 if (!iface->current_mode) { 765 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 766 HOSTAPD_LEVEL_WARNING, 767 "Hardware does not support configured mode"); 768 return; 769 } 770 hostapd_logger(iface->bss[0], NULL, 771 HOSTAPD_MODULE_IEEE80211, 772 HOSTAPD_LEVEL_WARNING, 773 "Configured channel (%d) not found from the " 774 "channel list of current mode (%d) %s", 775 iface->conf->channel, 776 iface->current_mode->mode, 777 hostapd_hw_mode_txt(iface->current_mode->mode)); 778 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 779 HOSTAPD_LEVEL_WARNING, 780 "Hardware does not support configured channel"); 781 } 782 783 784 int hostapd_acs_completed(struct hostapd_iface *iface, int err) 785 { 786 int ret = -1; 787 788 if (err) 789 goto out; 790 791 switch (hostapd_check_chans(iface)) { 792 case HOSTAPD_CHAN_VALID: 793 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, 794 ACS_EVENT_COMPLETED "freq=%d channel=%d", 795 hostapd_hw_get_freq(iface->bss[0], 796 iface->conf->channel), 797 iface->conf->channel); 798 break; 799 case HOSTAPD_CHAN_ACS: 800 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available"); 801 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); 802 hostapd_notify_bad_chans(iface); 803 goto out; 804 case HOSTAPD_CHAN_INVALID: 805 default: 806 wpa_printf(MSG_ERROR, "ACS picked unusable channels"); 807 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); 808 hostapd_notify_bad_chans(iface); 809 goto out; 810 } 811 812 ret = hostapd_check_ht_capab(iface); 813 if (ret < 0) 814 goto out; 815 if (ret == 1) { 816 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback"); 817 return 0; 818 } 819 820 ret = 0; 821 out: 822 return hostapd_setup_interface_complete(iface, ret); 823 } 824 825 826 /** 827 * hostapd_select_hw_mode - Select the hardware mode 828 * @iface: Pointer to interface data. 829 * Returns: 0 on success, < 0 on failure 830 * 831 * Sets up the hardware mode, channel, rates, and passive scanning 832 * based on the configuration. 833 */ 834 int hostapd_select_hw_mode(struct hostapd_iface *iface) 835 { 836 int i; 837 838 if (iface->num_hw_features < 1) 839 return -1; 840 841 if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G || 842 iface->conf->ieee80211n || iface->conf->ieee80211ac) && 843 iface->conf->channel == 14) { 844 wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14"); 845 iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B; 846 iface->conf->ieee80211n = 0; 847 iface->conf->ieee80211ac = 0; 848 } 849 850 iface->current_mode = NULL; 851 for (i = 0; i < iface->num_hw_features; i++) { 852 struct hostapd_hw_modes *mode = &iface->hw_features[i]; 853 if (mode->mode == iface->conf->hw_mode) { 854 iface->current_mode = mode; 855 break; 856 } 857 } 858 859 if (iface->current_mode == NULL) { 860 if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) || 861 !(iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY)) 862 { 863 wpa_printf(MSG_ERROR, 864 "Hardware does not support configured mode"); 865 hostapd_logger(iface->bss[0], NULL, 866 HOSTAPD_MODULE_IEEE80211, 867 HOSTAPD_LEVEL_WARNING, 868 "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)", 869 (int) iface->conf->hw_mode); 870 return -2; 871 } 872 } 873 874 switch (hostapd_check_chans(iface)) { 875 case HOSTAPD_CHAN_VALID: 876 return 0; 877 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */ 878 return 1; 879 case HOSTAPD_CHAN_INVALID: 880 default: 881 hostapd_notify_bad_chans(iface); 882 return -3; 883 } 884 } 885 886 887 const char * hostapd_hw_mode_txt(int mode) 888 { 889 switch (mode) { 890 case HOSTAPD_MODE_IEEE80211A: 891 return "IEEE 802.11a"; 892 case HOSTAPD_MODE_IEEE80211B: 893 return "IEEE 802.11b"; 894 case HOSTAPD_MODE_IEEE80211G: 895 return "IEEE 802.11g"; 896 case HOSTAPD_MODE_IEEE80211AD: 897 return "IEEE 802.11ad"; 898 default: 899 return "UNKNOWN"; 900 } 901 } 902 903 904 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan) 905 { 906 return hw_get_freq(hapd->iface->current_mode, chan); 907 } 908 909 910 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq) 911 { 912 return hw_get_chan(hapd->iface->current_mode, freq); 913 } 914
