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 28void 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 46static 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 75int 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 145int 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 225static 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 240static 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 252static 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 ieee80211n_switch_pri_sec(iface); 265 266 return !!res; 267} 268 269 270static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface, 271 struct wpa_scan_results *scan_res) 272{ 273 int pri_chan, sec_chan; 274 275 pri_chan = iface->conf->channel; 276 sec_chan = pri_chan + iface->conf->secondary_channel * 4; 277 278 return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan, 279 sec_chan); 280} 281 282 283static void ieee80211n_check_scan(struct hostapd_iface *iface) 284{ 285 struct wpa_scan_results *scan_res; 286 int oper40; 287 int res; 288 289 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is 290 * allowed per IEEE Std 802.11-2012, 10.15.3.2 */ 291 292 iface->scan_cb = NULL; 293 294 scan_res = hostapd_driver_get_scan_results(iface->bss[0]); 295 if (scan_res == NULL) { 296 hostapd_setup_interface_complete(iface, 1); 297 return; 298 } 299 300 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A) 301 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res); 302 else 303 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res); 304 wpa_scan_results_free(scan_res); 305 306 iface->secondary_ch = iface->conf->secondary_channel; 307 if (!oper40) { 308 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on " 309 "channel pri=%d sec=%d based on overlapping BSSes", 310 iface->conf->channel, 311 iface->conf->channel + 312 iface->conf->secondary_channel * 4); 313 iface->conf->secondary_channel = 0; 314 if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) { 315 /* 316 * TODO: Could consider scheduling another scan to check 317 * if channel width can be changed if no coex reports 318 * are received from associating stations. 319 */ 320 } 321 } 322 323 res = ieee80211n_allowed_ht40_channel_pair(iface); 324 if (!res) { 325 iface->conf->secondary_channel = 0; 326 wpa_printf(MSG_INFO, "Fallback to 20 MHz"); 327 } 328 329 hostapd_setup_interface_complete(iface, !res); 330} 331 332 333static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface, 334 struct wpa_driver_scan_params *params) 335{ 336 /* Scan only the affected frequency range */ 337 int pri_freq, sec_freq; 338 int affected_start, affected_end; 339 int i, pos; 340 struct hostapd_hw_modes *mode; 341 342 if (iface->current_mode == NULL) 343 return; 344 345 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 346 if (iface->conf->secondary_channel > 0) 347 sec_freq = pri_freq + 20; 348 else 349 sec_freq = pri_freq - 20; 350 /* 351 * Note: Need to find the PRI channel also in cases where the affected 352 * channel is the SEC channel of a 40 MHz BSS, so need to include the 353 * scanning coverage here to be 40 MHz from the center frequency. 354 */ 355 affected_start = (pri_freq + sec_freq) / 2 - 40; 356 affected_end = (pri_freq + sec_freq) / 2 + 40; 357 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 358 affected_start, affected_end); 359 360 mode = iface->current_mode; 361 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); 362 if (params->freqs == NULL) 363 return; 364 pos = 0; 365 366 for (i = 0; i < mode->num_channels; i++) { 367 struct hostapd_channel_data *chan = &mode->channels[i]; 368 if (chan->flag & HOSTAPD_CHAN_DISABLED) 369 continue; 370 if (chan->freq < affected_start || 371 chan->freq > affected_end) 372 continue; 373 params->freqs[pos++] = chan->freq; 374 } 375} 376 377 378static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface, 379 struct wpa_driver_scan_params *params) 380{ 381 /* Scan only the affected frequency range */ 382 int pri_freq; 383 int affected_start, affected_end; 384 int i, pos; 385 struct hostapd_hw_modes *mode; 386 387 if (iface->current_mode == NULL) 388 return; 389 390 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 391 if (iface->conf->secondary_channel > 0) { 392 affected_start = pri_freq - 10; 393 affected_end = pri_freq + 30; 394 } else { 395 affected_start = pri_freq - 30; 396 affected_end = pri_freq + 10; 397 } 398 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 399 affected_start, affected_end); 400 401 mode = iface->current_mode; 402 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); 403 if (params->freqs == NULL) 404 return; 405 pos = 0; 406 407 for (i = 0; i < mode->num_channels; i++) { 408 struct hostapd_channel_data *chan = &mode->channels[i]; 409 if (chan->flag & HOSTAPD_CHAN_DISABLED) 410 continue; 411 if (chan->freq < affected_start || 412 chan->freq > affected_end) 413 continue; 414 params->freqs[pos++] = chan->freq; 415 } 416} 417 418 419static void ap_ht40_scan_retry(void *eloop_data, void *user_data) 420{ 421#define HT2040_COEX_SCAN_RETRY 15 422 struct hostapd_iface *iface = eloop_data; 423 struct wpa_driver_scan_params params; 424 int ret; 425 426 os_memset(¶ms, 0, sizeof(params)); 427 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 428 ieee80211n_scan_channels_2g4(iface, ¶ms); 429 else 430 ieee80211n_scan_channels_5g(iface, ¶ms); 431 432 ret = hostapd_driver_scan(iface->bss[0], ¶ms); 433 iface->num_ht40_scan_tries++; 434 os_free(params.freqs); 435 436 if (ret == -EBUSY && 437 iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) { 438 wpa_printf(MSG_ERROR, 439 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)", 440 ret, strerror(-ret), iface->num_ht40_scan_tries); 441 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); 442 return; 443 } 444 445 if (ret == 0) { 446 iface->scan_cb = ieee80211n_check_scan; 447 return; 448 } 449 450 wpa_printf(MSG_DEBUG, 451 "Failed to request a scan in device, bringing up in HT20 mode"); 452 iface->conf->secondary_channel = 0; 453 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET; 454 hostapd_setup_interface_complete(iface, 0); 455} 456 457 458void hostapd_stop_setup_timers(struct hostapd_iface *iface) 459{ 460 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); 461} 462 463 464static int ieee80211n_check_40mhz(struct hostapd_iface *iface) 465{ 466 struct wpa_driver_scan_params params; 467 int ret; 468 469 if (!iface->conf->secondary_channel) 470 return 0; /* HT40 not used */ 471 472 hostapd_set_state(iface, HAPD_IFACE_HT_SCAN); 473 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling " 474 "40 MHz channel"); 475 os_memset(¶ms, 0, sizeof(params)); 476 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 477 ieee80211n_scan_channels_2g4(iface, ¶ms); 478 else 479 ieee80211n_scan_channels_5g(iface, ¶ms); 480 481 ret = hostapd_driver_scan(iface->bss[0], ¶ms); 482 os_free(params.freqs); 483 484 if (ret == -EBUSY) { 485 wpa_printf(MSG_ERROR, 486 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again", 487 ret, strerror(-ret)); 488 iface->num_ht40_scan_tries = 1; 489 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); 490 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); 491 return 1; 492 } 493 494 if (ret < 0) { 495 wpa_printf(MSG_ERROR, 496 "Failed to request a scan of neighboring BSSes ret=%d (%s)", 497 ret, strerror(-ret)); 498 return -1; 499 } 500 501 iface->scan_cb = ieee80211n_check_scan; 502 return 1; 503} 504 505 506static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface) 507{ 508 u16 hw = iface->current_mode->ht_capab; 509 u16 conf = iface->conf->ht_capab; 510 511 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) && 512 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) { 513 wpa_printf(MSG_ERROR, "Driver does not support configured " 514 "HT capability [LDPC]"); 515 return 0; 516 } 517 518 /* 519 * Driver ACS chosen channel may not be HT40 due to internal driver 520 * restrictions. 521 */ 522 if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) && 523 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) { 524 wpa_printf(MSG_ERROR, "Driver does not support configured " 525 "HT capability [HT40*]"); 526 return 0; 527 } 528 529 switch (conf & HT_CAP_INFO_SMPS_MASK) { 530 case HT_CAP_INFO_SMPS_STATIC: 531 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_STATIC)) { 532 wpa_printf(MSG_ERROR, 533 "Driver does not support configured HT capability [SMPS-STATIC]"); 534 return 0; 535 } 536 break; 537 case HT_CAP_INFO_SMPS_DYNAMIC: 538 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_DYNAMIC)) { 539 wpa_printf(MSG_ERROR, 540 "Driver does not support configured HT capability [SMPS-DYNAMIC]"); 541 return 0; 542 } 543 break; 544 case HT_CAP_INFO_SMPS_DISABLED: 545 default: 546 break; 547 } 548 549 if ((conf & HT_CAP_INFO_GREEN_FIELD) && 550 !(hw & HT_CAP_INFO_GREEN_FIELD)) { 551 wpa_printf(MSG_ERROR, "Driver does not support configured " 552 "HT capability [GF]"); 553 return 0; 554 } 555 556 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) && 557 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) { 558 wpa_printf(MSG_ERROR, "Driver does not support configured " 559 "HT capability [SHORT-GI-20]"); 560 return 0; 561 } 562 563 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) && 564 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) { 565 wpa_printf(MSG_ERROR, "Driver does not support configured " 566 "HT capability [SHORT-GI-40]"); 567 return 0; 568 } 569 570 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) { 571 wpa_printf(MSG_ERROR, "Driver does not support configured " 572 "HT capability [TX-STBC]"); 573 return 0; 574 } 575 576 if ((conf & HT_CAP_INFO_RX_STBC_MASK) > 577 (hw & HT_CAP_INFO_RX_STBC_MASK)) { 578 wpa_printf(MSG_ERROR, "Driver does not support configured " 579 "HT capability [RX-STBC*]"); 580 return 0; 581 } 582 583 if ((conf & HT_CAP_INFO_DELAYED_BA) && 584 !(hw & HT_CAP_INFO_DELAYED_BA)) { 585 wpa_printf(MSG_ERROR, "Driver does not support configured " 586 "HT capability [DELAYED-BA]"); 587 return 0; 588 } 589 590 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) && 591 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) { 592 wpa_printf(MSG_ERROR, "Driver does not support configured " 593 "HT capability [MAX-AMSDU-7935]"); 594 return 0; 595 } 596 597 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) && 598 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) { 599 wpa_printf(MSG_ERROR, "Driver does not support configured " 600 "HT capability [DSSS_CCK-40]"); 601 return 0; 602 } 603 604 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) && 605 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) { 606 wpa_printf(MSG_ERROR, "Driver does not support configured " 607 "HT capability [LSIG-TXOP-PROT]"); 608 return 0; 609 } 610 611 return 1; 612} 613 614 615#ifdef CONFIG_IEEE80211AC 616 617static int ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap, const char *name) 618{ 619 u32 req_cap = conf & cap; 620 621 /* 622 * Make sure we support all requested capabilities. 623 * NOTE: We assume that 'cap' represents a capability mask, 624 * not a discrete value. 625 */ 626 if ((hw & req_cap) != req_cap) { 627 wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]", 628 name); 629 return 0; 630 } 631 return 1; 632} 633 634 635static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 mask, 636 unsigned int shift, 637 const char *name) 638{ 639 u32 hw_max = hw & mask; 640 u32 conf_val = conf & mask; 641 642 if (conf_val > hw_max) { 643 wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)", 644 name, conf_val >> shift, hw_max >> shift); 645 return 0; 646 } 647 return 1; 648} 649 650 651static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface) 652{ 653 struct hostapd_hw_modes *mode = iface->current_mode; 654 u32 hw = mode->vht_capab; 655 u32 conf = iface->conf->vht_capab; 656 657 wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x", 658 hw, conf); 659 660 if (mode->mode == HOSTAPD_MODE_IEEE80211G && 661 iface->conf->bss[0]->vendor_vht && 662 mode->vht_capab == 0 && iface->hw_features) { 663 int i; 664 665 for (i = 0; i < iface->num_hw_features; i++) { 666 if (iface->hw_features[i].mode == 667 HOSTAPD_MODE_IEEE80211A) { 668 mode = &iface->hw_features[i]; 669 hw = mode->vht_capab; 670 wpa_printf(MSG_DEBUG, 671 "update hw vht capab based on 5 GHz band: 0x%x", 672 hw); 673 break; 674 } 675 } 676 } 677 678#define VHT_CAP_CHECK(cap) \ 679 do { \ 680 if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \ 681 return 0; \ 682 } while (0) 683 684#define VHT_CAP_CHECK_MAX(cap) \ 685 do { \ 686 if (!ieee80211ac_cap_check_max(hw, conf, cap, cap ## _SHIFT, \ 687 #cap)) \ 688 return 0; \ 689 } while (0) 690 691 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK); 692 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ); 693 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ); 694 VHT_CAP_CHECK(VHT_CAP_RXLDPC); 695 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80); 696 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160); 697 VHT_CAP_CHECK(VHT_CAP_TXSTBC); 698 VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK); 699 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE); 700 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE); 701 VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX); 702 VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX); 703 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE); 704 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE); 705 VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS); 706 VHT_CAP_CHECK(VHT_CAP_HTC_VHT); 707 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX); 708 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB); 709 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB); 710 VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN); 711 VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN); 712 713#undef VHT_CAP_CHECK 714#undef VHT_CAP_CHECK_MAX 715 716 return 1; 717} 718#endif /* CONFIG_IEEE80211AC */ 719 720#endif /* CONFIG_IEEE80211N */ 721 722 723int hostapd_check_ht_capab(struct hostapd_iface *iface) 724{ 725#ifdef CONFIG_IEEE80211N 726 int ret; 727 if (!iface->conf->ieee80211n) 728 return 0; 729 if (!ieee80211n_supported_ht_capab(iface)) 730 return -1; 731#ifdef CONFIG_IEEE80211AC 732 if (!ieee80211ac_supported_vht_capab(iface)) 733 return -1; 734#endif /* CONFIG_IEEE80211AC */ 735 ret = ieee80211n_check_40mhz(iface); 736 if (ret) 737 return ret; 738 if (!ieee80211n_allowed_ht40_channel_pair(iface)) 739 return -1; 740#endif /* CONFIG_IEEE80211N */ 741 742 return 0; 743} 744 745 746static int hostapd_is_usable_chan(struct hostapd_iface *iface, 747 int channel, int primary) 748{ 749 int i; 750 struct hostapd_channel_data *chan; 751 752 if (!iface->current_mode) 753 return 0; 754 755 for (i = 0; i < iface->current_mode->num_channels; i++) { 756 chan = &iface->current_mode->channels[i]; 757 if (chan->chan != channel) 758 continue; 759 760 if (!(chan->flag & HOSTAPD_CHAN_DISABLED)) 761 return 1; 762 763 wpa_printf(MSG_DEBUG, 764 "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s", 765 primary ? "" : "Configured HT40 secondary ", 766 i, chan->chan, chan->flag, 767 chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "", 768 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : ""); 769 } 770 771 return 0; 772} 773 774 775static int hostapd_is_usable_chans(struct hostapd_iface *iface) 776{ 777 if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1)) 778 return 0; 779 780 if (!iface->conf->secondary_channel) 781 return 1; 782 783 return hostapd_is_usable_chan(iface, iface->conf->channel + 784 iface->conf->secondary_channel * 4, 0); 785} 786 787 788static enum hostapd_chan_status 789hostapd_check_chans(struct hostapd_iface *iface) 790{ 791 if (iface->conf->channel) { 792 if (hostapd_is_usable_chans(iface)) 793 return HOSTAPD_CHAN_VALID; 794 else 795 return HOSTAPD_CHAN_INVALID; 796 } 797 798 /* 799 * The user set channel=0 or channel=acs_survey 800 * which is used to trigger ACS. 801 */ 802 803 switch (acs_init(iface)) { 804 case HOSTAPD_CHAN_ACS: 805 return HOSTAPD_CHAN_ACS; 806 case HOSTAPD_CHAN_VALID: 807 case HOSTAPD_CHAN_INVALID: 808 default: 809 return HOSTAPD_CHAN_INVALID; 810 } 811} 812 813 814static void hostapd_notify_bad_chans(struct hostapd_iface *iface) 815{ 816 if (!iface->current_mode) { 817 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 818 HOSTAPD_LEVEL_WARNING, 819 "Hardware does not support configured mode"); 820 return; 821 } 822 hostapd_logger(iface->bss[0], NULL, 823 HOSTAPD_MODULE_IEEE80211, 824 HOSTAPD_LEVEL_WARNING, 825 "Configured channel (%d) not found from the " 826 "channel list of current mode (%d) %s", 827 iface->conf->channel, 828 iface->current_mode->mode, 829 hostapd_hw_mode_txt(iface->current_mode->mode)); 830 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 831 HOSTAPD_LEVEL_WARNING, 832 "Hardware does not support configured channel"); 833} 834 835 836int hostapd_acs_completed(struct hostapd_iface *iface, int err) 837{ 838 int ret = -1; 839 840 if (err) 841 goto out; 842 843 switch (hostapd_check_chans(iface)) { 844 case HOSTAPD_CHAN_VALID: 845 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, 846 ACS_EVENT_COMPLETED "freq=%d channel=%d", 847 hostapd_hw_get_freq(iface->bss[0], 848 iface->conf->channel), 849 iface->conf->channel); 850 break; 851 case HOSTAPD_CHAN_ACS: 852 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available"); 853 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); 854 hostapd_notify_bad_chans(iface); 855 goto out; 856 case HOSTAPD_CHAN_INVALID: 857 default: 858 wpa_printf(MSG_ERROR, "ACS picked unusable channels"); 859 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); 860 hostapd_notify_bad_chans(iface); 861 goto out; 862 } 863 864 ret = hostapd_check_ht_capab(iface); 865 if (ret < 0) 866 goto out; 867 if (ret == 1) { 868 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback"); 869 return 0; 870 } 871 872 ret = 0; 873out: 874 return hostapd_setup_interface_complete(iface, ret); 875} 876 877 878/** 879 * hostapd_select_hw_mode - Select the hardware mode 880 * @iface: Pointer to interface data. 881 * Returns: 0 on success, < 0 on failure 882 * 883 * Sets up the hardware mode, channel, rates, and passive scanning 884 * based on the configuration. 885 */ 886int hostapd_select_hw_mode(struct hostapd_iface *iface) 887{ 888 int i; 889 890 if (iface->num_hw_features < 1) 891 return -1; 892 893 if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G || 894 iface->conf->ieee80211n || iface->conf->ieee80211ac) && 895 iface->conf->channel == 14) { 896 wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14"); 897 iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B; 898 iface->conf->ieee80211n = 0; 899 iface->conf->ieee80211ac = 0; 900 } 901 902 iface->current_mode = NULL; 903 for (i = 0; i < iface->num_hw_features; i++) { 904 struct hostapd_hw_modes *mode = &iface->hw_features[i]; 905 if (mode->mode == iface->conf->hw_mode) { 906 iface->current_mode = mode; 907 break; 908 } 909 } 910 911 if (iface->current_mode == NULL) { 912 if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) || 913 !(iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY)) 914 { 915 wpa_printf(MSG_ERROR, 916 "Hardware does not support configured mode"); 917 hostapd_logger(iface->bss[0], NULL, 918 HOSTAPD_MODULE_IEEE80211, 919 HOSTAPD_LEVEL_WARNING, 920 "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)", 921 (int) iface->conf->hw_mode); 922 return -2; 923 } 924 } 925 926 switch (hostapd_check_chans(iface)) { 927 case HOSTAPD_CHAN_VALID: 928 return 0; 929 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */ 930 return 1; 931 case HOSTAPD_CHAN_INVALID: 932 default: 933 hostapd_notify_bad_chans(iface); 934 return -3; 935 } 936} 937 938 939const char * hostapd_hw_mode_txt(int mode) 940{ 941 switch (mode) { 942 case HOSTAPD_MODE_IEEE80211A: 943 return "IEEE 802.11a"; 944 case HOSTAPD_MODE_IEEE80211B: 945 return "IEEE 802.11b"; 946 case HOSTAPD_MODE_IEEE80211G: 947 return "IEEE 802.11g"; 948 case HOSTAPD_MODE_IEEE80211AD: 949 return "IEEE 802.11ad"; 950 default: 951 return "UNKNOWN"; 952 } 953} 954 955 956int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan) 957{ 958 return hw_get_freq(hapd->iface->current_mode, chan); 959} 960 961 962int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq) 963{ 964 return hw_get_chan(hapd->iface->current_mode, freq); 965} 966