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@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 wpa_printf(MSG_INFO, "Fallback to 20 MHz"); 333 } 334 335 hostapd_setup_interface_complete(iface, !res); 336 } 337 338 339 static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface, 340 struct wpa_driver_scan_params *params) 341 { 342 /* Scan only the affected frequency range */ 343 int pri_freq, sec_freq; 344 int affected_start, affected_end; 345 int i, pos; 346 struct hostapd_hw_modes *mode; 347 348 if (iface->current_mode == NULL) 349 return; 350 351 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 352 if (iface->conf->secondary_channel > 0) 353 sec_freq = pri_freq + 20; 354 else 355 sec_freq = pri_freq - 20; 356 /* 357 * Note: Need to find the PRI channel also in cases where the affected 358 * channel is the SEC channel of a 40 MHz BSS, so need to include the 359 * scanning coverage here to be 40 MHz from the center frequency. 360 */ 361 affected_start = (pri_freq + sec_freq) / 2 - 40; 362 affected_end = (pri_freq + sec_freq) / 2 + 40; 363 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 364 affected_start, affected_end); 365 366 mode = iface->current_mode; 367 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); 368 if (params->freqs == NULL) 369 return; 370 pos = 0; 371 372 for (i = 0; i < mode->num_channels; i++) { 373 struct hostapd_channel_data *chan = &mode->channels[i]; 374 if (chan->flag & HOSTAPD_CHAN_DISABLED) 375 continue; 376 if (chan->freq < affected_start || 377 chan->freq > affected_end) 378 continue; 379 params->freqs[pos++] = chan->freq; 380 } 381 } 382 383 384 static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface, 385 struct wpa_driver_scan_params *params) 386 { 387 /* Scan only the affected frequency range */ 388 int pri_freq; 389 int affected_start, affected_end; 390 int i, pos; 391 struct hostapd_hw_modes *mode; 392 393 if (iface->current_mode == NULL) 394 return; 395 396 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 397 if (iface->conf->secondary_channel > 0) { 398 affected_start = pri_freq - 10; 399 affected_end = pri_freq + 30; 400 } else { 401 affected_start = pri_freq - 30; 402 affected_end = pri_freq + 10; 403 } 404 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 405 affected_start, affected_end); 406 407 mode = iface->current_mode; 408 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); 409 if (params->freqs == NULL) 410 return; 411 pos = 0; 412 413 for (i = 0; i < mode->num_channels; i++) { 414 struct hostapd_channel_data *chan = &mode->channels[i]; 415 if (chan->flag & HOSTAPD_CHAN_DISABLED) 416 continue; 417 if (chan->freq < affected_start || 418 chan->freq > affected_end) 419 continue; 420 params->freqs[pos++] = chan->freq; 421 } 422 } 423 424 425 static void ap_ht40_scan_retry(void *eloop_data, void *user_data) 426 { 427 #define HT2040_COEX_SCAN_RETRY 15 428 struct hostapd_iface *iface = eloop_data; 429 struct wpa_driver_scan_params params; 430 int ret; 431 432 os_memset(¶ms, 0, sizeof(params)); 433 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 434 ieee80211n_scan_channels_2g4(iface, ¶ms); 435 else 436 ieee80211n_scan_channels_5g(iface, ¶ms); 437 438 ret = hostapd_driver_scan(iface->bss[0], ¶ms); 439 iface->num_ht40_scan_tries++; 440 os_free(params.freqs); 441 442 if (ret == -EBUSY && 443 iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) { 444 wpa_printf(MSG_ERROR, 445 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)", 446 ret, strerror(-ret), iface->num_ht40_scan_tries); 447 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); 448 return; 449 } 450 451 if (ret == 0) { 452 iface->scan_cb = ieee80211n_check_scan; 453 return; 454 } 455 456 wpa_printf(MSG_DEBUG, 457 "Failed to request a scan in device, bringing up in HT20 mode"); 458 iface->conf->secondary_channel = 0; 459 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET; 460 hostapd_setup_interface_complete(iface, 0); 461 } 462 463 464 void hostapd_stop_setup_timers(struct hostapd_iface *iface) 465 { 466 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); 467 } 468 469 470 static int ieee80211n_check_40mhz(struct hostapd_iface *iface) 471 { 472 struct wpa_driver_scan_params params; 473 int ret; 474 475 if (!iface->conf->secondary_channel) 476 return 0; /* HT40 not used */ 477 478 hostapd_set_state(iface, HAPD_IFACE_HT_SCAN); 479 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling " 480 "40 MHz channel"); 481 os_memset(¶ms, 0, sizeof(params)); 482 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 483 ieee80211n_scan_channels_2g4(iface, ¶ms); 484 else 485 ieee80211n_scan_channels_5g(iface, ¶ms); 486 487 ret = hostapd_driver_scan(iface->bss[0], ¶ms); 488 os_free(params.freqs); 489 490 if (ret == -EBUSY) { 491 wpa_printf(MSG_ERROR, 492 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again", 493 ret, strerror(-ret)); 494 iface->num_ht40_scan_tries = 1; 495 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); 496 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); 497 return 1; 498 } 499 500 if (ret < 0) { 501 wpa_printf(MSG_ERROR, 502 "Failed to request a scan of neighboring BSSes ret=%d (%s)", 503 ret, strerror(-ret)); 504 return -1; 505 } 506 507 iface->scan_cb = ieee80211n_check_scan; 508 return 1; 509 } 510 511 512 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface) 513 { 514 u16 hw = iface->current_mode->ht_capab; 515 u16 conf = iface->conf->ht_capab; 516 517 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) && 518 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) { 519 wpa_printf(MSG_ERROR, "Driver does not support configured " 520 "HT capability [LDPC]"); 521 return 0; 522 } 523 524 /* 525 * Driver ACS chosen channel may not be HT40 due to internal driver 526 * restrictions. 527 */ 528 if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) && 529 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) { 530 wpa_printf(MSG_ERROR, "Driver does not support configured " 531 "HT capability [HT40*]"); 532 return 0; 533 } 534 535 switch (conf & HT_CAP_INFO_SMPS_MASK) { 536 case HT_CAP_INFO_SMPS_STATIC: 537 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_STATIC)) { 538 wpa_printf(MSG_ERROR, 539 "Driver does not support configured HT capability [SMPS-STATIC]"); 540 return 0; 541 } 542 break; 543 case HT_CAP_INFO_SMPS_DYNAMIC: 544 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_DYNAMIC)) { 545 wpa_printf(MSG_ERROR, 546 "Driver does not support configured HT capability [SMPS-DYNAMIC]"); 547 return 0; 548 } 549 break; 550 case HT_CAP_INFO_SMPS_DISABLED: 551 default: 552 break; 553 } 554 555 if ((conf & HT_CAP_INFO_GREEN_FIELD) && 556 !(hw & HT_CAP_INFO_GREEN_FIELD)) { 557 wpa_printf(MSG_ERROR, "Driver does not support configured " 558 "HT capability [GF]"); 559 return 0; 560 } 561 562 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) && 563 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) { 564 wpa_printf(MSG_ERROR, "Driver does not support configured " 565 "HT capability [SHORT-GI-20]"); 566 return 0; 567 } 568 569 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) && 570 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) { 571 wpa_printf(MSG_ERROR, "Driver does not support configured " 572 "HT capability [SHORT-GI-40]"); 573 return 0; 574 } 575 576 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) { 577 wpa_printf(MSG_ERROR, "Driver does not support configured " 578 "HT capability [TX-STBC]"); 579 return 0; 580 } 581 582 if ((conf & HT_CAP_INFO_RX_STBC_MASK) > 583 (hw & HT_CAP_INFO_RX_STBC_MASK)) { 584 wpa_printf(MSG_ERROR, "Driver does not support configured " 585 "HT capability [RX-STBC*]"); 586 return 0; 587 } 588 589 if ((conf & HT_CAP_INFO_DELAYED_BA) && 590 !(hw & HT_CAP_INFO_DELAYED_BA)) { 591 wpa_printf(MSG_ERROR, "Driver does not support configured " 592 "HT capability [DELAYED-BA]"); 593 return 0; 594 } 595 596 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) && 597 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) { 598 wpa_printf(MSG_ERROR, "Driver does not support configured " 599 "HT capability [MAX-AMSDU-7935]"); 600 return 0; 601 } 602 603 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) && 604 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) { 605 wpa_printf(MSG_ERROR, "Driver does not support configured " 606 "HT capability [DSSS_CCK-40]"); 607 return 0; 608 } 609 610 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) && 611 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) { 612 wpa_printf(MSG_ERROR, "Driver does not support configured " 613 "HT capability [LSIG-TXOP-PROT]"); 614 return 0; 615 } 616 617 return 1; 618 } 619 620 621 #ifdef CONFIG_IEEE80211AC 622 623 static int ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap, const char *name) 624 { 625 u32 req_cap = conf & cap; 626 627 /* 628 * Make sure we support all requested capabilities. 629 * NOTE: We assume that 'cap' represents a capability mask, 630 * not a discrete value. 631 */ 632 if ((hw & req_cap) != req_cap) { 633 wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]", 634 name); 635 return 0; 636 } 637 return 1; 638 } 639 640 641 static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 mask, 642 unsigned int shift, 643 const char *name) 644 { 645 u32 hw_max = hw & mask; 646 u32 conf_val = conf & mask; 647 648 if (conf_val > hw_max) { 649 wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)", 650 name, conf_val >> shift, hw_max >> shift); 651 return 0; 652 } 653 return 1; 654 } 655 656 657 static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface) 658 { 659 struct hostapd_hw_modes *mode = iface->current_mode; 660 u32 hw = mode->vht_capab; 661 u32 conf = iface->conf->vht_capab; 662 663 wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x", 664 hw, conf); 665 666 if (mode->mode == HOSTAPD_MODE_IEEE80211G && 667 iface->conf->bss[0]->vendor_vht && 668 mode->vht_capab == 0 && iface->hw_features) { 669 int i; 670 671 for (i = 0; i < iface->num_hw_features; i++) { 672 if (iface->hw_features[i].mode == 673 HOSTAPD_MODE_IEEE80211A) { 674 mode = &iface->hw_features[i]; 675 hw = mode->vht_capab; 676 wpa_printf(MSG_DEBUG, 677 "update hw vht capab based on 5 GHz band: 0x%x", 678 hw); 679 break; 680 } 681 } 682 } 683 684 #define VHT_CAP_CHECK(cap) \ 685 do { \ 686 if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \ 687 return 0; \ 688 } while (0) 689 690 #define VHT_CAP_CHECK_MAX(cap) \ 691 do { \ 692 if (!ieee80211ac_cap_check_max(hw, conf, cap, cap ## _SHIFT, \ 693 #cap)) \ 694 return 0; \ 695 } while (0) 696 697 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK); 698 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ); 699 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ); 700 VHT_CAP_CHECK(VHT_CAP_RXLDPC); 701 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80); 702 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160); 703 VHT_CAP_CHECK(VHT_CAP_TXSTBC); 704 VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK); 705 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE); 706 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE); 707 VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX); 708 VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX); 709 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE); 710 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE); 711 VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS); 712 VHT_CAP_CHECK(VHT_CAP_HTC_VHT); 713 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX); 714 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB); 715 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB); 716 VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN); 717 VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN); 718 719 #undef VHT_CAP_CHECK 720 #undef VHT_CAP_CHECK_MAX 721 722 return 1; 723 } 724 #endif /* CONFIG_IEEE80211AC */ 725 726 #endif /* CONFIG_IEEE80211N */ 727 728 729 int hostapd_check_ht_capab(struct hostapd_iface *iface) 730 { 731 #ifdef CONFIG_IEEE80211N 732 int ret; 733 if (!iface->conf->ieee80211n) 734 return 0; 735 736 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B && 737 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G && 738 (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) { 739 wpa_printf(MSG_DEBUG, 740 "Disable HT capability [DSSS_CCK-40] on 5 GHz band"); 741 iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ; 742 } 743 744 if (!ieee80211n_supported_ht_capab(iface)) 745 return -1; 746 #ifdef CONFIG_IEEE80211AC 747 if (!ieee80211ac_supported_vht_capab(iface)) 748 return -1; 749 #endif /* CONFIG_IEEE80211AC */ 750 ret = ieee80211n_check_40mhz(iface); 751 if (ret) 752 return ret; 753 if (!ieee80211n_allowed_ht40_channel_pair(iface)) 754 return -1; 755 #endif /* CONFIG_IEEE80211N */ 756 757 return 0; 758 } 759 760 761 static int hostapd_is_usable_chan(struct hostapd_iface *iface, 762 int channel, int primary) 763 { 764 int i; 765 struct hostapd_channel_data *chan; 766 767 if (!iface->current_mode) 768 return 0; 769 770 for (i = 0; i < iface->current_mode->num_channels; i++) { 771 chan = &iface->current_mode->channels[i]; 772 if (chan->chan != channel) 773 continue; 774 775 if (!(chan->flag & HOSTAPD_CHAN_DISABLED)) 776 return 1; 777 778 wpa_printf(MSG_DEBUG, 779 "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s", 780 primary ? "" : "Configured HT40 secondary ", 781 i, chan->chan, chan->flag, 782 chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "", 783 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : ""); 784 } 785 786 return 0; 787 } 788 789 790 static int hostapd_is_usable_chans(struct hostapd_iface *iface) 791 { 792 if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1)) 793 return 0; 794 795 if (!iface->conf->secondary_channel) 796 return 1; 797 798 return hostapd_is_usable_chan(iface, iface->conf->channel + 799 iface->conf->secondary_channel * 4, 0); 800 } 801 802 803 static enum hostapd_chan_status 804 hostapd_check_chans(struct hostapd_iface *iface) 805 { 806 if (iface->conf->channel) { 807 if (hostapd_is_usable_chans(iface)) 808 return HOSTAPD_CHAN_VALID; 809 else 810 return HOSTAPD_CHAN_INVALID; 811 } 812 813 /* 814 * The user set channel=0 or channel=acs_survey 815 * which is used to trigger ACS. 816 */ 817 818 switch (acs_init(iface)) { 819 case HOSTAPD_CHAN_ACS: 820 return HOSTAPD_CHAN_ACS; 821 case HOSTAPD_CHAN_VALID: 822 case HOSTAPD_CHAN_INVALID: 823 default: 824 return HOSTAPD_CHAN_INVALID; 825 } 826 } 827 828 829 static void hostapd_notify_bad_chans(struct hostapd_iface *iface) 830 { 831 if (!iface->current_mode) { 832 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 833 HOSTAPD_LEVEL_WARNING, 834 "Hardware does not support configured mode"); 835 return; 836 } 837 hostapd_logger(iface->bss[0], NULL, 838 HOSTAPD_MODULE_IEEE80211, 839 HOSTAPD_LEVEL_WARNING, 840 "Configured channel (%d) not found from the " 841 "channel list of current mode (%d) %s", 842 iface->conf->channel, 843 iface->current_mode->mode, 844 hostapd_hw_mode_txt(iface->current_mode->mode)); 845 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 846 HOSTAPD_LEVEL_WARNING, 847 "Hardware does not support configured channel"); 848 } 849 850 851 int hostapd_acs_completed(struct hostapd_iface *iface, int err) 852 { 853 int ret = -1; 854 855 if (err) 856 goto out; 857 858 switch (hostapd_check_chans(iface)) { 859 case HOSTAPD_CHAN_VALID: 860 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, 861 ACS_EVENT_COMPLETED "freq=%d channel=%d", 862 hostapd_hw_get_freq(iface->bss[0], 863 iface->conf->channel), 864 iface->conf->channel); 865 break; 866 case HOSTAPD_CHAN_ACS: 867 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available"); 868 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); 869 hostapd_notify_bad_chans(iface); 870 goto out; 871 case HOSTAPD_CHAN_INVALID: 872 default: 873 wpa_printf(MSG_ERROR, "ACS picked unusable channels"); 874 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); 875 hostapd_notify_bad_chans(iface); 876 goto out; 877 } 878 879 ret = hostapd_check_ht_capab(iface); 880 if (ret < 0) 881 goto out; 882 if (ret == 1) { 883 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback"); 884 return 0; 885 } 886 887 ret = 0; 888 out: 889 return hostapd_setup_interface_complete(iface, ret); 890 } 891 892 893 /** 894 * hostapd_select_hw_mode - Select the hardware mode 895 * @iface: Pointer to interface data. 896 * Returns: 0 on success, < 0 on failure 897 * 898 * Sets up the hardware mode, channel, rates, and passive scanning 899 * based on the configuration. 900 */ 901 int hostapd_select_hw_mode(struct hostapd_iface *iface) 902 { 903 int i; 904 905 if (iface->num_hw_features < 1) 906 return -1; 907 908 if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G || 909 iface->conf->ieee80211n || iface->conf->ieee80211ac) && 910 iface->conf->channel == 14) { 911 wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14"); 912 iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B; 913 iface->conf->ieee80211n = 0; 914 iface->conf->ieee80211ac = 0; 915 } 916 917 iface->current_mode = NULL; 918 for (i = 0; i < iface->num_hw_features; i++) { 919 struct hostapd_hw_modes *mode = &iface->hw_features[i]; 920 if (mode->mode == iface->conf->hw_mode) { 921 iface->current_mode = mode; 922 break; 923 } 924 } 925 926 if (iface->current_mode == NULL) { 927 if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) || 928 !(iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY)) 929 { 930 wpa_printf(MSG_ERROR, 931 "Hardware does not support configured mode"); 932 hostapd_logger(iface->bss[0], NULL, 933 HOSTAPD_MODULE_IEEE80211, 934 HOSTAPD_LEVEL_WARNING, 935 "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)", 936 (int) iface->conf->hw_mode); 937 return -2; 938 } 939 } 940 941 switch (hostapd_check_chans(iface)) { 942 case HOSTAPD_CHAN_VALID: 943 return 0; 944 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */ 945 return 1; 946 case HOSTAPD_CHAN_INVALID: 947 default: 948 hostapd_notify_bad_chans(iface); 949 return -3; 950 } 951 } 952 953 954 const char * hostapd_hw_mode_txt(int mode) 955 { 956 switch (mode) { 957 case HOSTAPD_MODE_IEEE80211A: 958 return "IEEE 802.11a"; 959 case HOSTAPD_MODE_IEEE80211B: 960 return "IEEE 802.11b"; 961 case HOSTAPD_MODE_IEEE80211G: 962 return "IEEE 802.11g"; 963 case HOSTAPD_MODE_IEEE80211AD: 964 return "IEEE 802.11ad"; 965 default: 966 return "UNKNOWN"; 967 } 968 } 969 970 971 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan) 972 { 973 return hw_get_freq(hapd->iface->current_mode, chan); 974 } 975 976 977 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq) 978 { 979 return hw_get_chan(hapd->iface->current_mode, freq); 980 } 981