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 res = 1; 333 wpa_printf(MSG_INFO, "Fallback to 20 MHz"); 334 } 335 336 hostapd_setup_interface_complete(iface, !res); 337 } 338 339 340 static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface, 341 struct wpa_driver_scan_params *params) 342 { 343 /* Scan only the affected frequency range */ 344 int pri_freq, sec_freq; 345 int affected_start, affected_end; 346 int i, pos; 347 struct hostapd_hw_modes *mode; 348 349 if (iface->current_mode == NULL) 350 return; 351 352 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 353 if (iface->conf->secondary_channel > 0) 354 sec_freq = pri_freq + 20; 355 else 356 sec_freq = pri_freq - 20; 357 /* 358 * Note: Need to find the PRI channel also in cases where the affected 359 * channel is the SEC channel of a 40 MHz BSS, so need to include the 360 * scanning coverage here to be 40 MHz from the center frequency. 361 */ 362 affected_start = (pri_freq + sec_freq) / 2 - 40; 363 affected_end = (pri_freq + sec_freq) / 2 + 40; 364 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 365 affected_start, affected_end); 366 367 mode = iface->current_mode; 368 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); 369 if (params->freqs == NULL) 370 return; 371 pos = 0; 372 373 for (i = 0; i < mode->num_channels; i++) { 374 struct hostapd_channel_data *chan = &mode->channels[i]; 375 if (chan->flag & HOSTAPD_CHAN_DISABLED) 376 continue; 377 if (chan->freq < affected_start || 378 chan->freq > affected_end) 379 continue; 380 params->freqs[pos++] = chan->freq; 381 } 382 } 383 384 385 static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface, 386 struct wpa_driver_scan_params *params) 387 { 388 /* Scan only the affected frequency range */ 389 int pri_freq; 390 int affected_start, affected_end; 391 int i, pos; 392 struct hostapd_hw_modes *mode; 393 394 if (iface->current_mode == NULL) 395 return; 396 397 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 398 if (iface->conf->secondary_channel > 0) { 399 affected_start = pri_freq - 10; 400 affected_end = pri_freq + 30; 401 } else { 402 affected_start = pri_freq - 30; 403 affected_end = pri_freq + 10; 404 } 405 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 406 affected_start, affected_end); 407 408 mode = iface->current_mode; 409 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int)); 410 if (params->freqs == NULL) 411 return; 412 pos = 0; 413 414 for (i = 0; i < mode->num_channels; i++) { 415 struct hostapd_channel_data *chan = &mode->channels[i]; 416 if (chan->flag & HOSTAPD_CHAN_DISABLED) 417 continue; 418 if (chan->freq < affected_start || 419 chan->freq > affected_end) 420 continue; 421 params->freqs[pos++] = chan->freq; 422 } 423 } 424 425 426 static void ap_ht40_scan_retry(void *eloop_data, void *user_data) 427 { 428 #define HT2040_COEX_SCAN_RETRY 15 429 struct hostapd_iface *iface = eloop_data; 430 struct wpa_driver_scan_params params; 431 int ret; 432 433 os_memset(¶ms, 0, sizeof(params)); 434 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 435 ieee80211n_scan_channels_2g4(iface, ¶ms); 436 else 437 ieee80211n_scan_channels_5g(iface, ¶ms); 438 439 ret = hostapd_driver_scan(iface->bss[0], ¶ms); 440 iface->num_ht40_scan_tries++; 441 os_free(params.freqs); 442 443 if (ret == -EBUSY && 444 iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) { 445 wpa_printf(MSG_ERROR, 446 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)", 447 ret, strerror(-ret), iface->num_ht40_scan_tries); 448 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); 449 return; 450 } 451 452 if (ret == 0) { 453 iface->scan_cb = ieee80211n_check_scan; 454 return; 455 } 456 457 wpa_printf(MSG_DEBUG, 458 "Failed to request a scan in device, bringing up in HT20 mode"); 459 iface->conf->secondary_channel = 0; 460 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET; 461 hostapd_setup_interface_complete(iface, 0); 462 } 463 464 465 void hostapd_stop_setup_timers(struct hostapd_iface *iface) 466 { 467 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); 468 } 469 470 471 static int ieee80211n_check_40mhz(struct hostapd_iface *iface) 472 { 473 struct wpa_driver_scan_params params; 474 int ret; 475 476 /* Check that HT40 is used and PRI / SEC switch is allowed */ 477 if (!iface->conf->secondary_channel || iface->conf->no_pri_sec_switch) 478 return 0; 479 480 hostapd_set_state(iface, HAPD_IFACE_HT_SCAN); 481 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling " 482 "40 MHz channel"); 483 os_memset(¶ms, 0, sizeof(params)); 484 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) 485 ieee80211n_scan_channels_2g4(iface, ¶ms); 486 else 487 ieee80211n_scan_channels_5g(iface, ¶ms); 488 489 ret = hostapd_driver_scan(iface->bss[0], ¶ms); 490 os_free(params.freqs); 491 492 if (ret == -EBUSY) { 493 wpa_printf(MSG_ERROR, 494 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again", 495 ret, strerror(-ret)); 496 iface->num_ht40_scan_tries = 1; 497 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL); 498 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL); 499 return 1; 500 } 501 502 if (ret < 0) { 503 wpa_printf(MSG_ERROR, 504 "Failed to request a scan of neighboring BSSes ret=%d (%s)", 505 ret, strerror(-ret)); 506 return -1; 507 } 508 509 iface->scan_cb = ieee80211n_check_scan; 510 return 1; 511 } 512 513 514 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface) 515 { 516 u16 hw = iface->current_mode->ht_capab; 517 u16 conf = iface->conf->ht_capab; 518 519 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) && 520 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) { 521 wpa_printf(MSG_ERROR, "Driver does not support configured " 522 "HT capability [LDPC]"); 523 return 0; 524 } 525 526 /* 527 * Driver ACS chosen channel may not be HT40 due to internal driver 528 * restrictions. 529 */ 530 if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) && 531 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) { 532 wpa_printf(MSG_ERROR, "Driver does not support configured " 533 "HT capability [HT40*]"); 534 return 0; 535 } 536 537 switch (conf & HT_CAP_INFO_SMPS_MASK) { 538 case HT_CAP_INFO_SMPS_STATIC: 539 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_STATIC)) { 540 wpa_printf(MSG_ERROR, 541 "Driver does not support configured HT capability [SMPS-STATIC]"); 542 return 0; 543 } 544 break; 545 case HT_CAP_INFO_SMPS_DYNAMIC: 546 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_DYNAMIC)) { 547 wpa_printf(MSG_ERROR, 548 "Driver does not support configured HT capability [SMPS-DYNAMIC]"); 549 return 0; 550 } 551 break; 552 case HT_CAP_INFO_SMPS_DISABLED: 553 default: 554 break; 555 } 556 557 if ((conf & HT_CAP_INFO_GREEN_FIELD) && 558 !(hw & HT_CAP_INFO_GREEN_FIELD)) { 559 wpa_printf(MSG_ERROR, "Driver does not support configured " 560 "HT capability [GF]"); 561 return 0; 562 } 563 564 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) && 565 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) { 566 wpa_printf(MSG_ERROR, "Driver does not support configured " 567 "HT capability [SHORT-GI-20]"); 568 return 0; 569 } 570 571 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) && 572 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) { 573 wpa_printf(MSG_ERROR, "Driver does not support configured " 574 "HT capability [SHORT-GI-40]"); 575 return 0; 576 } 577 578 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) { 579 wpa_printf(MSG_ERROR, "Driver does not support configured " 580 "HT capability [TX-STBC]"); 581 return 0; 582 } 583 584 if ((conf & HT_CAP_INFO_RX_STBC_MASK) > 585 (hw & HT_CAP_INFO_RX_STBC_MASK)) { 586 wpa_printf(MSG_ERROR, "Driver does not support configured " 587 "HT capability [RX-STBC*]"); 588 return 0; 589 } 590 591 if ((conf & HT_CAP_INFO_DELAYED_BA) && 592 !(hw & HT_CAP_INFO_DELAYED_BA)) { 593 wpa_printf(MSG_ERROR, "Driver does not support configured " 594 "HT capability [DELAYED-BA]"); 595 return 0; 596 } 597 598 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) && 599 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) { 600 wpa_printf(MSG_ERROR, "Driver does not support configured " 601 "HT capability [MAX-AMSDU-7935]"); 602 return 0; 603 } 604 605 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) && 606 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) { 607 wpa_printf(MSG_ERROR, "Driver does not support configured " 608 "HT capability [DSSS_CCK-40]"); 609 return 0; 610 } 611 612 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) && 613 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) { 614 wpa_printf(MSG_ERROR, "Driver does not support configured " 615 "HT capability [LSIG-TXOP-PROT]"); 616 return 0; 617 } 618 619 return 1; 620 } 621 622 623 #ifdef CONFIG_IEEE80211AC 624 625 static int ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap, const char *name) 626 { 627 u32 req_cap = conf & cap; 628 629 /* 630 * Make sure we support all requested capabilities. 631 * NOTE: We assume that 'cap' represents a capability mask, 632 * not a discrete value. 633 */ 634 if ((hw & req_cap) != req_cap) { 635 wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]", 636 name); 637 return 0; 638 } 639 return 1; 640 } 641 642 643 static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 mask, 644 unsigned int shift, 645 const char *name) 646 { 647 u32 hw_max = hw & mask; 648 u32 conf_val = conf & mask; 649 650 if (conf_val > hw_max) { 651 wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)", 652 name, conf_val >> shift, hw_max >> shift); 653 return 0; 654 } 655 return 1; 656 } 657 658 659 static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface) 660 { 661 struct hostapd_hw_modes *mode = iface->current_mode; 662 u32 hw = mode->vht_capab; 663 u32 conf = iface->conf->vht_capab; 664 665 wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x", 666 hw, conf); 667 668 if (mode->mode == HOSTAPD_MODE_IEEE80211G && 669 iface->conf->bss[0]->vendor_vht && 670 mode->vht_capab == 0 && iface->hw_features) { 671 int i; 672 673 for (i = 0; i < iface->num_hw_features; i++) { 674 if (iface->hw_features[i].mode == 675 HOSTAPD_MODE_IEEE80211A) { 676 mode = &iface->hw_features[i]; 677 hw = mode->vht_capab; 678 wpa_printf(MSG_DEBUG, 679 "update hw vht capab based on 5 GHz band: 0x%x", 680 hw); 681 break; 682 } 683 } 684 } 685 686 #define VHT_CAP_CHECK(cap) \ 687 do { \ 688 if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \ 689 return 0; \ 690 } while (0) 691 692 #define VHT_CAP_CHECK_MAX(cap) \ 693 do { \ 694 if (!ieee80211ac_cap_check_max(hw, conf, cap, cap ## _SHIFT, \ 695 #cap)) \ 696 return 0; \ 697 } while (0) 698 699 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK); 700 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ); 701 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ); 702 VHT_CAP_CHECK(VHT_CAP_RXLDPC); 703 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80); 704 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160); 705 VHT_CAP_CHECK(VHT_CAP_TXSTBC); 706 VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK); 707 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE); 708 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE); 709 VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX); 710 VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX); 711 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE); 712 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE); 713 VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS); 714 VHT_CAP_CHECK(VHT_CAP_HTC_VHT); 715 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX); 716 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB); 717 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB); 718 VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN); 719 VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN); 720 721 #undef VHT_CAP_CHECK 722 #undef VHT_CAP_CHECK_MAX 723 724 return 1; 725 } 726 #endif /* CONFIG_IEEE80211AC */ 727 728 #endif /* CONFIG_IEEE80211N */ 729 730 731 int hostapd_check_ht_capab(struct hostapd_iface *iface) 732 { 733 #ifdef CONFIG_IEEE80211N 734 int ret; 735 if (!iface->conf->ieee80211n) 736 return 0; 737 738 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B && 739 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G && 740 (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) { 741 wpa_printf(MSG_DEBUG, 742 "Disable HT capability [DSSS_CCK-40] on 5 GHz band"); 743 iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ; 744 } 745 746 if (!ieee80211n_supported_ht_capab(iface)) 747 return -1; 748 #ifdef CONFIG_IEEE80211AC 749 if (!ieee80211ac_supported_vht_capab(iface)) 750 return -1; 751 #endif /* CONFIG_IEEE80211AC */ 752 ret = ieee80211n_check_40mhz(iface); 753 if (ret) 754 return ret; 755 if (!ieee80211n_allowed_ht40_channel_pair(iface)) 756 return -1; 757 #endif /* CONFIG_IEEE80211N */ 758 759 return 0; 760 } 761 762 763 static int hostapd_is_usable_chan(struct hostapd_iface *iface, 764 int channel, int primary) 765 { 766 int i; 767 struct hostapd_channel_data *chan; 768 769 if (!iface->current_mode) 770 return 0; 771 772 for (i = 0; i < iface->current_mode->num_channels; i++) { 773 chan = &iface->current_mode->channels[i]; 774 if (chan->chan != channel) 775 continue; 776 777 if (!(chan->flag & HOSTAPD_CHAN_DISABLED)) 778 return 1; 779 780 wpa_printf(MSG_DEBUG, 781 "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s", 782 primary ? "" : "Configured HT40 secondary ", 783 i, chan->chan, chan->flag, 784 chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "", 785 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : ""); 786 } 787 788 return 0; 789 } 790 791 792 static int hostapd_is_usable_chans(struct hostapd_iface *iface) 793 { 794 if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1)) 795 return 0; 796 797 if (!iface->conf->secondary_channel) 798 return 1; 799 800 return hostapd_is_usable_chan(iface, iface->conf->channel + 801 iface->conf->secondary_channel * 4, 0); 802 } 803 804 805 static enum hostapd_chan_status 806 hostapd_check_chans(struct hostapd_iface *iface) 807 { 808 if (iface->conf->channel) { 809 if (hostapd_is_usable_chans(iface)) 810 return HOSTAPD_CHAN_VALID; 811 else 812 return HOSTAPD_CHAN_INVALID; 813 } 814 815 /* 816 * The user set channel=0 or channel=acs_survey 817 * which is used to trigger ACS. 818 */ 819 820 switch (acs_init(iface)) { 821 case HOSTAPD_CHAN_ACS: 822 return HOSTAPD_CHAN_ACS; 823 case HOSTAPD_CHAN_VALID: 824 case HOSTAPD_CHAN_INVALID: 825 default: 826 return HOSTAPD_CHAN_INVALID; 827 } 828 } 829 830 831 static void hostapd_notify_bad_chans(struct hostapd_iface *iface) 832 { 833 if (!iface->current_mode) { 834 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 835 HOSTAPD_LEVEL_WARNING, 836 "Hardware does not support configured mode"); 837 return; 838 } 839 hostapd_logger(iface->bss[0], NULL, 840 HOSTAPD_MODULE_IEEE80211, 841 HOSTAPD_LEVEL_WARNING, 842 "Configured channel (%d) not found from the " 843 "channel list of current mode (%d) %s", 844 iface->conf->channel, 845 iface->current_mode->mode, 846 hostapd_hw_mode_txt(iface->current_mode->mode)); 847 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 848 HOSTAPD_LEVEL_WARNING, 849 "Hardware does not support configured channel"); 850 } 851 852 853 int hostapd_acs_completed(struct hostapd_iface *iface, int err) 854 { 855 int ret = -1; 856 857 if (err) 858 goto out; 859 860 switch (hostapd_check_chans(iface)) { 861 case HOSTAPD_CHAN_VALID: 862 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, 863 ACS_EVENT_COMPLETED "freq=%d channel=%d", 864 hostapd_hw_get_freq(iface->bss[0], 865 iface->conf->channel), 866 iface->conf->channel); 867 break; 868 case HOSTAPD_CHAN_ACS: 869 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available"); 870 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); 871 hostapd_notify_bad_chans(iface); 872 goto out; 873 case HOSTAPD_CHAN_INVALID: 874 default: 875 wpa_printf(MSG_ERROR, "ACS picked unusable channels"); 876 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED); 877 hostapd_notify_bad_chans(iface); 878 goto out; 879 } 880 881 ret = hostapd_check_ht_capab(iface); 882 if (ret < 0) 883 goto out; 884 if (ret == 1) { 885 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback"); 886 return 0; 887 } 888 889 ret = 0; 890 out: 891 return hostapd_setup_interface_complete(iface, ret); 892 } 893 894 895 /** 896 * hostapd_select_hw_mode - Select the hardware mode 897 * @iface: Pointer to interface data. 898 * Returns: 0 on success, < 0 on failure 899 * 900 * Sets up the hardware mode, channel, rates, and passive scanning 901 * based on the configuration. 902 */ 903 int hostapd_select_hw_mode(struct hostapd_iface *iface) 904 { 905 int i; 906 907 if (iface->num_hw_features < 1) 908 return -1; 909 910 if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G || 911 iface->conf->ieee80211n || iface->conf->ieee80211ac) && 912 iface->conf->channel == 14) { 913 wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14"); 914 iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B; 915 iface->conf->ieee80211n = 0; 916 iface->conf->ieee80211ac = 0; 917 } 918 919 iface->current_mode = NULL; 920 for (i = 0; i < iface->num_hw_features; i++) { 921 struct hostapd_hw_modes *mode = &iface->hw_features[i]; 922 if (mode->mode == iface->conf->hw_mode) { 923 iface->current_mode = mode; 924 break; 925 } 926 } 927 928 if (iface->current_mode == NULL) { 929 if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) || 930 !(iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY)) 931 { 932 wpa_printf(MSG_ERROR, 933 "Hardware does not support configured mode"); 934 hostapd_logger(iface->bss[0], NULL, 935 HOSTAPD_MODULE_IEEE80211, 936 HOSTAPD_LEVEL_WARNING, 937 "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)", 938 (int) iface->conf->hw_mode); 939 return -2; 940 } 941 } 942 943 switch (hostapd_check_chans(iface)) { 944 case HOSTAPD_CHAN_VALID: 945 return 0; 946 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */ 947 return 1; 948 case HOSTAPD_CHAN_INVALID: 949 default: 950 hostapd_notify_bad_chans(iface); 951 return -3; 952 } 953 } 954 955 956 const char * hostapd_hw_mode_txt(int mode) 957 { 958 switch (mode) { 959 case HOSTAPD_MODE_IEEE80211A: 960 return "IEEE 802.11a"; 961 case HOSTAPD_MODE_IEEE80211B: 962 return "IEEE 802.11b"; 963 case HOSTAPD_MODE_IEEE80211G: 964 return "IEEE 802.11g"; 965 case HOSTAPD_MODE_IEEE80211AD: 966 return "IEEE 802.11ad"; 967 default: 968 return "UNKNOWN"; 969 } 970 } 971 972 973 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan) 974 { 975 return hw_get_freq(hapd->iface->current_mode, chan); 976 } 977 978 979 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq) 980 { 981 return hw_get_chan(hapd->iface->current_mode, freq); 982 } 983
