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) 2008-2011, Jouni Malinen <j (at) w1.fi> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Alternatively, this software may be distributed under the terms of BSD 12 * license. 13 * 14 * See README and COPYING for more details. 15 */ 16 17 #include "utils/includes.h" 18 19 #include "utils/common.h" 20 #include "utils/eloop.h" 21 #include "common/ieee802_11_defs.h" 22 #include "common/ieee802_11_common.h" 23 #include "drivers/driver.h" 24 #include "hostapd.h" 25 #include "ap_config.h" 26 #include "ap_drv_ops.h" 27 #include "hw_features.h" 28 29 30 void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features, 31 size_t num_hw_features) 32 { 33 size_t i; 34 35 if (hw_features == NULL) 36 return; 37 38 for (i = 0; i < num_hw_features; i++) { 39 os_free(hw_features[i].channels); 40 os_free(hw_features[i].rates); 41 } 42 43 os_free(hw_features); 44 } 45 46 47 int hostapd_get_hw_features(struct hostapd_iface *iface) 48 { 49 struct hostapd_data *hapd = iface->bss[0]; 50 int ret = 0, i, j; 51 u16 num_modes, flags; 52 struct hostapd_hw_modes *modes; 53 54 if (hostapd_drv_none(hapd)) 55 return -1; 56 modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags); 57 if (modes == NULL) { 58 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211, 59 HOSTAPD_LEVEL_DEBUG, 60 "Fetching hardware channel/rate support not " 61 "supported."); 62 return -1; 63 } 64 65 iface->hw_flags = flags; 66 67 hostapd_free_hw_features(iface->hw_features, iface->num_hw_features); 68 iface->hw_features = modes; 69 iface->num_hw_features = num_modes; 70 71 for (i = 0; i < num_modes; i++) { 72 struct hostapd_hw_modes *feature = &modes[i]; 73 /* set flag for channels we can use in current regulatory 74 * domain */ 75 for (j = 0; j < feature->num_channels; j++) { 76 /* 77 * Disable all channels that are marked not to allow 78 * IBSS operation or active scanning. In addition, 79 * disable all channels that require radar detection, 80 * since that (in addition to full DFS) is not yet 81 * supported. 82 */ 83 if (feature->channels[j].flag & 84 (HOSTAPD_CHAN_NO_IBSS | 85 HOSTAPD_CHAN_PASSIVE_SCAN | 86 HOSTAPD_CHAN_RADAR)) 87 feature->channels[j].flag |= 88 HOSTAPD_CHAN_DISABLED; 89 if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED) 90 continue; 91 wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d " 92 "chan=%d freq=%d MHz max_tx_power=%d dBm", 93 feature->mode, 94 feature->channels[j].chan, 95 feature->channels[j].freq, 96 feature->channels[j].max_tx_power); 97 } 98 } 99 100 return ret; 101 } 102 103 104 int hostapd_prepare_rates(struct hostapd_iface *iface, 105 struct hostapd_hw_modes *mode) 106 { 107 int i, num_basic_rates = 0; 108 int basic_rates_a[] = { 60, 120, 240, -1 }; 109 int basic_rates_b[] = { 10, 20, -1 }; 110 int basic_rates_g[] = { 10, 20, 55, 110, -1 }; 111 int *basic_rates; 112 113 if (iface->conf->basic_rates) 114 basic_rates = iface->conf->basic_rates; 115 else switch (mode->mode) { 116 case HOSTAPD_MODE_IEEE80211A: 117 basic_rates = basic_rates_a; 118 break; 119 case HOSTAPD_MODE_IEEE80211B: 120 basic_rates = basic_rates_b; 121 break; 122 case HOSTAPD_MODE_IEEE80211G: 123 basic_rates = basic_rates_g; 124 break; 125 default: 126 return -1; 127 } 128 129 i = 0; 130 while (basic_rates[i] >= 0) 131 i++; 132 os_free(iface->basic_rates); 133 iface->basic_rates = os_malloc(i * sizeof(int)); 134 if (iface->basic_rates) 135 os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int)); 136 137 os_free(iface->current_rates); 138 iface->num_rates = 0; 139 140 iface->current_rates = 141 os_zalloc(mode->num_rates * sizeof(struct hostapd_rate_data)); 142 if (!iface->current_rates) { 143 wpa_printf(MSG_ERROR, "Failed to allocate memory for rate " 144 "table."); 145 return -1; 146 } 147 148 for (i = 0; i < mode->num_rates; i++) { 149 struct hostapd_rate_data *rate; 150 151 if (iface->conf->supported_rates && 152 !hostapd_rate_found(iface->conf->supported_rates, 153 mode->rates[i])) 154 continue; 155 156 rate = &iface->current_rates[iface->num_rates]; 157 rate->rate = mode->rates[i]; 158 if (hostapd_rate_found(basic_rates, rate->rate)) { 159 rate->flags |= HOSTAPD_RATE_BASIC; 160 num_basic_rates++; 161 } 162 wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x", 163 iface->num_rates, rate->rate, rate->flags); 164 iface->num_rates++; 165 } 166 167 if ((iface->num_rates == 0 || num_basic_rates == 0) && 168 (!iface->conf->ieee80211n || !iface->conf->require_ht)) { 169 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic " 170 "rate sets (%d,%d).", 171 iface->num_rates, num_basic_rates); 172 return -1; 173 } 174 175 return 0; 176 } 177 178 179 #ifdef CONFIG_IEEE80211N 180 static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface) 181 { 182 int sec_chan, ok, j, first; 183 int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157, 184 184, 192 }; 185 size_t k; 186 187 if (!iface->conf->secondary_channel) 188 return 1; /* HT40 not used */ 189 190 sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4; 191 wpa_printf(MSG_DEBUG, "HT40: control channel: %d " 192 "secondary channel: %d", 193 iface->conf->channel, sec_chan); 194 195 /* Verify that HT40 secondary channel is an allowed 20 MHz 196 * channel */ 197 ok = 0; 198 for (j = 0; j < iface->current_mode->num_channels; j++) { 199 struct hostapd_channel_data *chan = 200 &iface->current_mode->channels[j]; 201 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) && 202 chan->chan == sec_chan) { 203 ok = 1; 204 break; 205 } 206 } 207 if (!ok) { 208 wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed", 209 sec_chan); 210 return 0; 211 } 212 213 /* 214 * Verify that HT40 primary,secondary channel pair is allowed per 215 * IEEE 802.11n Annex J. This is only needed for 5 GHz band since 216 * 2.4 GHz rules allow all cases where the secondary channel fits into 217 * the list of allowed channels (already checked above). 218 */ 219 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) 220 return 1; 221 222 if (iface->conf->secondary_channel > 0) 223 first = iface->conf->channel; 224 else 225 first = sec_chan; 226 227 ok = 0; 228 for (k = 0; k < sizeof(allowed) / sizeof(allowed[0]); k++) { 229 if (first == allowed[k]) { 230 ok = 1; 231 break; 232 } 233 } 234 if (!ok) { 235 wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed", 236 iface->conf->channel, 237 iface->conf->secondary_channel); 238 return 0; 239 } 240 241 return 1; 242 } 243 244 245 static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface) 246 { 247 if (iface->conf->secondary_channel > 0) { 248 iface->conf->channel += 4; 249 iface->conf->secondary_channel = -1; 250 } else { 251 iface->conf->channel -= 4; 252 iface->conf->secondary_channel = 1; 253 } 254 } 255 256 257 static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss, 258 int *pri_chan, int *sec_chan) 259 { 260 struct ieee80211_ht_operation *oper; 261 struct ieee802_11_elems elems; 262 263 *pri_chan = *sec_chan = 0; 264 265 ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0); 266 if (elems.ht_operation && 267 elems.ht_operation_len >= sizeof(*oper)) { 268 oper = (struct ieee80211_ht_operation *) elems.ht_operation; 269 *pri_chan = oper->control_chan; 270 if (oper->ht_param & HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH) { 271 int sec = oper->ht_param & 272 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK; 273 if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE) 274 *sec_chan = *pri_chan + 4; 275 else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW) 276 *sec_chan = *pri_chan - 4; 277 } 278 } 279 } 280 281 282 static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface, 283 struct wpa_scan_results *scan_res) 284 { 285 int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss; 286 int bss_pri_chan, bss_sec_chan; 287 size_t i; 288 int match; 289 290 pri_chan = iface->conf->channel; 291 sec_chan = iface->conf->secondary_channel * 4; 292 pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan); 293 if (iface->conf->secondary_channel > 0) 294 sec_freq = pri_freq + 20; 295 else 296 sec_freq = pri_freq - 20; 297 298 /* 299 * Switch PRI/SEC channels if Beacons were detected on selected SEC 300 * channel, but not on selected PRI channel. 301 */ 302 pri_bss = sec_bss = 0; 303 for (i = 0; i < scan_res->num; i++) { 304 struct wpa_scan_res *bss = scan_res->res[i]; 305 if (bss->freq == pri_freq) 306 pri_bss++; 307 else if (bss->freq == sec_freq) 308 sec_bss++; 309 } 310 if (sec_bss && !pri_bss) { 311 wpa_printf(MSG_INFO, "Switch own primary and secondary " 312 "channel to get secondary channel with no Beacons " 313 "from other BSSes"); 314 ieee80211n_switch_pri_sec(iface); 315 } 316 317 /* 318 * Match PRI/SEC channel with any existing HT40 BSS on the same 319 * channels that we are about to use (if already mixed order in 320 * existing BSSes, use own preference). 321 */ 322 match = 0; 323 for (i = 0; i < scan_res->num; i++) { 324 struct wpa_scan_res *bss = scan_res->res[i]; 325 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan); 326 if (pri_chan == bss_pri_chan && 327 sec_chan == bss_sec_chan) { 328 match = 1; 329 break; 330 } 331 } 332 if (!match) { 333 for (i = 0; i < scan_res->num; i++) { 334 struct wpa_scan_res *bss = scan_res->res[i]; 335 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, 336 &bss_sec_chan); 337 if (pri_chan == bss_sec_chan && 338 sec_chan == bss_pri_chan) { 339 wpa_printf(MSG_INFO, "Switch own primary and " 340 "secondary channel due to BSS " 341 "overlap with " MACSTR, 342 MAC2STR(bss->bssid)); 343 ieee80211n_switch_pri_sec(iface); 344 break; 345 } 346 } 347 } 348 349 return 1; 350 } 351 352 353 static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface, 354 struct wpa_scan_results *scan_res) 355 { 356 int pri_freq, sec_freq; 357 int affected_start, affected_end; 358 size_t i; 359 360 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 361 if (iface->conf->secondary_channel > 0) 362 sec_freq = pri_freq + 20; 363 else 364 sec_freq = pri_freq - 20; 365 affected_start = (pri_freq + sec_freq) / 2 - 25; 366 affected_end = (pri_freq + sec_freq) / 2 + 25; 367 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 368 affected_start, affected_end); 369 for (i = 0; i < scan_res->num; i++) { 370 struct wpa_scan_res *bss = scan_res->res[i]; 371 int pri = bss->freq; 372 int sec = pri; 373 int sec_chan, pri_chan; 374 375 ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan); 376 377 if (sec_chan) { 378 if (sec_chan < pri_chan) 379 sec = pri - 20; 380 else 381 sec = pri + 20; 382 } 383 384 if ((pri < affected_start || pri > affected_end) && 385 (sec < affected_start || sec > affected_end)) 386 continue; /* not within affected channel range */ 387 388 wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR 389 " freq=%d pri=%d sec=%d", 390 MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan); 391 392 if (sec_chan) { 393 if (pri_freq != pri || sec_freq != sec) { 394 wpa_printf(MSG_DEBUG, "40 MHz pri/sec " 395 "mismatch with BSS " MACSTR 396 " <%d,%d> (chan=%d%c) vs. <%d,%d>", 397 MAC2STR(bss->bssid), 398 pri, sec, pri_chan, 399 sec > pri ? '+' : '-', 400 pri_freq, sec_freq); 401 return 0; 402 } 403 } 404 405 /* TODO: 40 MHz intolerant */ 406 } 407 408 return 1; 409 } 410 411 412 static void ieee80211n_check_scan(struct hostapd_iface *iface) 413 { 414 struct wpa_scan_results *scan_res; 415 int oper40; 416 int res; 417 418 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is 419 * allowed per IEEE 802.11n/D7.0, 11.14.3.2 */ 420 421 iface->scan_cb = NULL; 422 423 scan_res = hostapd_driver_get_scan_results(iface->bss[0]); 424 if (scan_res == NULL) { 425 hostapd_setup_interface_complete(iface, 1); 426 return; 427 } 428 429 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A) 430 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res); 431 else 432 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res); 433 wpa_scan_results_free(scan_res); 434 435 if (!oper40) { 436 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on " 437 "channel pri=%d sec=%d based on overlapping BSSes", 438 iface->conf->channel, 439 iface->conf->channel + 440 iface->conf->secondary_channel * 4); 441 iface->conf->secondary_channel = 0; 442 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET; 443 } 444 445 res = ieee80211n_allowed_ht40_channel_pair(iface); 446 hostapd_setup_interface_complete(iface, !res); 447 } 448 449 450 static int ieee80211n_check_40mhz(struct hostapd_iface *iface) 451 { 452 struct wpa_driver_scan_params params; 453 454 if (!iface->conf->secondary_channel) 455 return 0; /* HT40 not used */ 456 457 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling " 458 "40 MHz channel"); 459 os_memset(¶ms, 0, sizeof(params)); 460 /* TODO: scan only the needed frequency */ 461 if (hostapd_driver_scan(iface->bss[0], ¶ms) < 0) { 462 wpa_printf(MSG_ERROR, "Failed to request a scan of " 463 "neighboring BSSes"); 464 return -1; 465 } 466 467 iface->scan_cb = ieee80211n_check_scan; 468 return 1; 469 } 470 471 472 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface) 473 { 474 u16 hw = iface->current_mode->ht_capab; 475 u16 conf = iface->conf->ht_capab; 476 477 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) && 478 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) { 479 wpa_printf(MSG_ERROR, "Driver does not support configured " 480 "HT capability [LDPC]"); 481 return 0; 482 } 483 484 if ((conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) && 485 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) { 486 wpa_printf(MSG_ERROR, "Driver does not support configured " 487 "HT capability [HT40*]"); 488 return 0; 489 } 490 491 if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) && 492 (conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) { 493 wpa_printf(MSG_ERROR, "Driver does not support configured " 494 "HT capability [SMPS-*]"); 495 return 0; 496 } 497 498 if ((conf & HT_CAP_INFO_GREEN_FIELD) && 499 !(hw & HT_CAP_INFO_GREEN_FIELD)) { 500 wpa_printf(MSG_ERROR, "Driver does not support configured " 501 "HT capability [GF]"); 502 return 0; 503 } 504 505 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) && 506 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) { 507 wpa_printf(MSG_ERROR, "Driver does not support configured " 508 "HT capability [SHORT-GI-20]"); 509 return 0; 510 } 511 512 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) && 513 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) { 514 wpa_printf(MSG_ERROR, "Driver does not support configured " 515 "HT capability [SHORT-GI-40]"); 516 return 0; 517 } 518 519 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) { 520 wpa_printf(MSG_ERROR, "Driver does not support configured " 521 "HT capability [TX-STBC]"); 522 return 0; 523 } 524 525 if ((conf & HT_CAP_INFO_RX_STBC_MASK) > 526 (hw & HT_CAP_INFO_RX_STBC_MASK)) { 527 wpa_printf(MSG_ERROR, "Driver does not support configured " 528 "HT capability [RX-STBC*]"); 529 return 0; 530 } 531 532 if ((conf & HT_CAP_INFO_DELAYED_BA) && 533 !(hw & HT_CAP_INFO_DELAYED_BA)) { 534 wpa_printf(MSG_ERROR, "Driver does not support configured " 535 "HT capability [DELAYED-BA]"); 536 return 0; 537 } 538 539 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) && 540 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) { 541 wpa_printf(MSG_ERROR, "Driver does not support configured " 542 "HT capability [MAX-AMSDU-7935]"); 543 return 0; 544 } 545 546 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) && 547 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) { 548 wpa_printf(MSG_ERROR, "Driver does not support configured " 549 "HT capability [DSSS_CCK-40]"); 550 return 0; 551 } 552 553 if ((conf & HT_CAP_INFO_PSMP_SUPP) && !(hw & HT_CAP_INFO_PSMP_SUPP)) { 554 wpa_printf(MSG_ERROR, "Driver does not support configured " 555 "HT capability [PSMP]"); 556 return 0; 557 } 558 559 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) && 560 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) { 561 wpa_printf(MSG_ERROR, "Driver does not support configured " 562 "HT capability [LSIG-TXOP-PROT]"); 563 return 0; 564 } 565 566 return 1; 567 } 568 569 #endif /* CONFIG_IEEE80211N */ 570 571 572 int hostapd_check_ht_capab(struct hostapd_iface *iface) 573 { 574 #ifdef CONFIG_IEEE80211N 575 int ret; 576 if (!iface->conf->ieee80211n) 577 return 0; 578 if (!ieee80211n_supported_ht_capab(iface)) 579 return -1; 580 ret = ieee80211n_check_40mhz(iface); 581 if (ret) 582 return ret; 583 if (!ieee80211n_allowed_ht40_channel_pair(iface)) 584 return -1; 585 #endif /* CONFIG_IEEE80211N */ 586 587 return 0; 588 } 589 590 591 /** 592 * hostapd_select_hw_mode - Select the hardware mode 593 * @iface: Pointer to interface data. 594 * Returns: 0 on success, < 0 on failure 595 * 596 * Sets up the hardware mode, channel, rates, and passive scanning 597 * based on the configuration. 598 */ 599 int hostapd_select_hw_mode(struct hostapd_iface *iface) 600 { 601 int i, j, ok; 602 603 if (iface->num_hw_features < 1) 604 return -1; 605 606 iface->current_mode = NULL; 607 for (i = 0; i < iface->num_hw_features; i++) { 608 struct hostapd_hw_modes *mode = &iface->hw_features[i]; 609 if (mode->mode == iface->conf->hw_mode) { 610 iface->current_mode = mode; 611 break; 612 } 613 } 614 615 if (iface->current_mode == NULL) { 616 wpa_printf(MSG_ERROR, "Hardware does not support configured " 617 "mode"); 618 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 619 HOSTAPD_LEVEL_WARNING, 620 "Hardware does not support configured mode " 621 "(%d) (hw_mode in hostapd.conf)", 622 (int) iface->conf->hw_mode); 623 return -2; 624 } 625 626 ok = 0; 627 for (j = 0; j < iface->current_mode->num_channels; j++) { 628 struct hostapd_channel_data *chan = 629 &iface->current_mode->channels[j]; 630 if (chan->chan == iface->conf->channel) { 631 if (chan->flag & HOSTAPD_CHAN_DISABLED) { 632 wpa_printf(MSG_ERROR, 633 "channel [%i] (%i) is disabled for " 634 "use in AP mode, flags: 0x%x%s%s%s", 635 j, chan->chan, chan->flag, 636 chan->flag & HOSTAPD_CHAN_NO_IBSS ? 637 " NO-IBSS" : "", 638 chan->flag & 639 HOSTAPD_CHAN_PASSIVE_SCAN ? 640 " PASSIVE-SCAN" : "", 641 chan->flag & HOSTAPD_CHAN_RADAR ? 642 " RADAR" : ""); 643 } else { 644 ok = 1; 645 break; 646 } 647 } 648 } 649 if (ok && iface->conf->secondary_channel) { 650 int sec_ok = 0; 651 int sec_chan = iface->conf->channel + 652 iface->conf->secondary_channel * 4; 653 for (j = 0; j < iface->current_mode->num_channels; j++) { 654 struct hostapd_channel_data *chan = 655 &iface->current_mode->channels[j]; 656 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) && 657 (chan->chan == sec_chan)) { 658 sec_ok = 1; 659 break; 660 } 661 } 662 if (!sec_ok) { 663 hostapd_logger(iface->bss[0], NULL, 664 HOSTAPD_MODULE_IEEE80211, 665 HOSTAPD_LEVEL_WARNING, 666 "Configured HT40 secondary channel " 667 "(%d) not found from the channel list " 668 "of current mode (%d) %s", 669 sec_chan, iface->current_mode->mode, 670 hostapd_hw_mode_txt( 671 iface->current_mode->mode)); 672 ok = 0; 673 } 674 } 675 if (iface->conf->channel == 0) { 676 /* TODO: could request a scan of neighboring BSSes and select 677 * the channel automatically */ 678 wpa_printf(MSG_ERROR, "Channel not configured " 679 "(hw_mode/channel in hostapd.conf)"); 680 return -3; 681 } 682 if (ok == 0 && iface->conf->channel != 0) { 683 hostapd_logger(iface->bss[0], NULL, 684 HOSTAPD_MODULE_IEEE80211, 685 HOSTAPD_LEVEL_WARNING, 686 "Configured channel (%d) not found from the " 687 "channel list of current mode (%d) %s", 688 iface->conf->channel, 689 iface->current_mode->mode, 690 hostapd_hw_mode_txt(iface->current_mode->mode)); 691 iface->current_mode = NULL; 692 } 693 694 if (iface->current_mode == NULL) { 695 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 696 HOSTAPD_LEVEL_WARNING, 697 "Hardware does not support configured channel"); 698 return -4; 699 } 700 701 return 0; 702 } 703 704 705 const char * hostapd_hw_mode_txt(int mode) 706 { 707 switch (mode) { 708 case HOSTAPD_MODE_IEEE80211A: 709 return "IEEE 802.11a"; 710 case HOSTAPD_MODE_IEEE80211B: 711 return "IEEE 802.11b"; 712 case HOSTAPD_MODE_IEEE80211G: 713 return "IEEE 802.11g"; 714 default: 715 return "UNKNOWN"; 716 } 717 } 718 719 720 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan) 721 { 722 int i; 723 724 if (!hapd->iface->current_mode) 725 return 0; 726 727 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) { 728 struct hostapd_channel_data *ch = 729 &hapd->iface->current_mode->channels[i]; 730 if (ch->chan == chan) 731 return ch->freq; 732 } 733 734 return 0; 735 } 736 737 738 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq) 739 { 740 int i; 741 742 if (!hapd->iface->current_mode) 743 return 0; 744 745 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) { 746 struct hostapd_channel_data *ch = 747 &hapd->iface->current_mode->channels[i]; 748 if (ch->freq == freq) 749 return ch->chan; 750 } 751 752 return 0; 753 } 754
