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) 2008-2009, Jouni Malinen <j@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 30void 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 47int 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 104static int hostapd_prepare_rates(struct hostapd_data *hapd, 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 (hapd->iconf->basic_rates) 114 basic_rates = hapd->iconf->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 if (hostapd_set_rate_sets(hapd, hapd->iconf->supported_rates, 130 basic_rates, mode->mode)) { 131 wpa_printf(MSG_ERROR, "Failed to update rate sets in kernel " 132 "module"); 133 } 134 135 os_free(hapd->iface->current_rates); 136 hapd->iface->num_rates = 0; 137 138 hapd->iface->current_rates = 139 os_zalloc(mode->num_rates * sizeof(struct hostapd_rate_data)); 140 if (!hapd->iface->current_rates) { 141 wpa_printf(MSG_ERROR, "Failed to allocate memory for rate " 142 "table."); 143 return -1; 144 } 145 146 for (i = 0; i < mode->num_rates; i++) { 147 struct hostapd_rate_data *rate; 148 149 if (hapd->iconf->supported_rates && 150 !hostapd_rate_found(hapd->iconf->supported_rates, 151 mode->rates[i])) 152 continue; 153 154 rate = &hapd->iface->current_rates[hapd->iface->num_rates]; 155 rate->rate = mode->rates[i]; 156 if (hostapd_rate_found(basic_rates, rate->rate)) { 157 rate->flags |= HOSTAPD_RATE_BASIC; 158 num_basic_rates++; 159 } 160 wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x", 161 hapd->iface->num_rates, rate->rate, rate->flags); 162 hapd->iface->num_rates++; 163 } 164 165 if (hapd->iface->num_rates == 0 || num_basic_rates == 0) { 166 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic " 167 "rate sets (%d,%d).", 168 hapd->iface->num_rates, num_basic_rates); 169 return -1; 170 } 171 172 return 0; 173} 174 175 176#ifdef CONFIG_IEEE80211N 177static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface) 178{ 179 int sec_chan, ok, j, first; 180 int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157, 181 184, 192 }; 182 size_t k; 183 184 if (!iface->conf->secondary_channel) 185 return 1; /* HT40 not used */ 186 187 sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4; 188 wpa_printf(MSG_DEBUG, "HT40: control channel: %d " 189 "secondary channel: %d", 190 iface->conf->channel, sec_chan); 191 192 /* Verify that HT40 secondary channel is an allowed 20 MHz 193 * channel */ 194 ok = 0; 195 for (j = 0; j < iface->current_mode->num_channels; j++) { 196 struct hostapd_channel_data *chan = 197 &iface->current_mode->channels[j]; 198 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) && 199 chan->chan == sec_chan) { 200 ok = 1; 201 break; 202 } 203 } 204 if (!ok) { 205 wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed", 206 sec_chan); 207 return 0; 208 } 209 210 /* 211 * Verify that HT40 primary,secondary channel pair is allowed per 212 * IEEE 802.11n Annex J. This is only needed for 5 GHz band since 213 * 2.4 GHz rules allow all cases where the secondary channel fits into 214 * the list of allowed channels (already checked above). 215 */ 216 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) 217 return 1; 218 219 if (iface->conf->secondary_channel > 0) 220 first = iface->conf->channel; 221 else 222 first = sec_chan; 223 224 ok = 0; 225 for (k = 0; k < sizeof(allowed) / sizeof(allowed[0]); k++) { 226 if (first == allowed[k]) { 227 ok = 1; 228 break; 229 } 230 } 231 if (!ok) { 232 wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed", 233 iface->conf->channel, 234 iface->conf->secondary_channel); 235 return 0; 236 } 237 238 return 1; 239} 240 241 242static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface) 243{ 244 if (iface->conf->secondary_channel > 0) { 245 iface->conf->channel += 4; 246 iface->conf->secondary_channel = -1; 247 } else { 248 iface->conf->channel -= 4; 249 iface->conf->secondary_channel = 1; 250 } 251} 252 253 254static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss, 255 int *pri_chan, int *sec_chan) 256{ 257 struct ieee80211_ht_operation *oper; 258 struct ieee802_11_elems elems; 259 260 *pri_chan = *sec_chan = 0; 261 262 ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0); 263 if (elems.ht_operation && 264 elems.ht_operation_len >= sizeof(*oper)) { 265 oper = (struct ieee80211_ht_operation *) elems.ht_operation; 266 *pri_chan = oper->control_chan; 267 if (oper->ht_param & HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH) { 268 if (oper->ht_param & 269 HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE) 270 *sec_chan = *pri_chan + 4; 271 else if (oper->ht_param & 272 HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW) 273 *sec_chan = *pri_chan - 4; 274 } 275 } 276} 277 278 279static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface, 280 struct wpa_scan_results *scan_res) 281{ 282 int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss; 283 int bss_pri_chan, bss_sec_chan; 284 size_t i; 285 int match; 286 287 pri_chan = iface->conf->channel; 288 sec_chan = iface->conf->secondary_channel * 4; 289 pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan); 290 if (iface->conf->secondary_channel > 0) 291 sec_freq = pri_freq + 20; 292 else 293 sec_freq = pri_freq - 20; 294 295 /* 296 * Switch PRI/SEC channels if Beacons were detected on selected SEC 297 * channel, but not on selected PRI channel. 298 */ 299 pri_bss = sec_bss = 0; 300 for (i = 0; i < scan_res->num; i++) { 301 struct wpa_scan_res *bss = scan_res->res[i]; 302 if (bss->freq == pri_freq) 303 pri_bss++; 304 else if (bss->freq == sec_freq) 305 sec_bss++; 306 } 307 if (sec_bss && !pri_bss) { 308 wpa_printf(MSG_INFO, "Switch own primary and secondary " 309 "channel to get secondary channel with no Beacons " 310 "from other BSSes"); 311 ieee80211n_switch_pri_sec(iface); 312 } 313 314 /* 315 * Match PRI/SEC channel with any existing HT40 BSS on the same 316 * channels that we are about to use (if already mixed order in 317 * existing BSSes, use own preference). 318 */ 319 match = 0; 320 for (i = 0; i < scan_res->num; i++) { 321 struct wpa_scan_res *bss = scan_res->res[i]; 322 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan); 323 if (pri_chan == bss_pri_chan && 324 sec_chan == bss_sec_chan) { 325 match = 1; 326 break; 327 } 328 } 329 if (!match) { 330 for (i = 0; i < scan_res->num; i++) { 331 struct wpa_scan_res *bss = scan_res->res[i]; 332 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, 333 &bss_sec_chan); 334 if (pri_chan == bss_sec_chan && 335 sec_chan == bss_pri_chan) { 336 wpa_printf(MSG_INFO, "Switch own primary and " 337 "secondary channel due to BSS " 338 "overlap with " MACSTR, 339 MAC2STR(bss->bssid)); 340 ieee80211n_switch_pri_sec(iface); 341 break; 342 } 343 } 344 } 345 346 return 1; 347} 348 349 350static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface, 351 struct wpa_scan_results *scan_res) 352{ 353 int pri_freq, sec_freq; 354 int affected_start, affected_end; 355 size_t i; 356 357 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 358 if (iface->conf->secondary_channel > 0) 359 sec_freq = pri_freq + 20; 360 else 361 sec_freq = pri_freq - 20; 362 affected_start = (pri_freq + sec_freq) / 2 - 25; 363 affected_end = (pri_freq + sec_freq) / 2 + 25; 364 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz", 365 affected_start, affected_end); 366 for (i = 0; i < scan_res->num; i++) { 367 struct wpa_scan_res *bss = scan_res->res[i]; 368 int pri = bss->freq; 369 int sec = pri; 370 int sec_chan, pri_chan; 371 372 ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan); 373 374 if (sec_chan) { 375 if (sec_chan < pri_chan) 376 sec = pri - 20; 377 else 378 sec = pri + 20; 379 } 380 381 if ((pri < affected_start || pri > affected_end) && 382 (sec < affected_start || sec > affected_end)) 383 continue; /* not within affected channel range */ 384 385 wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR 386 " freq=%d pri=%d sec=%d", 387 MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan); 388 389 if (sec_chan) { 390 if (pri_freq != pri || sec_freq != sec) { 391 wpa_printf(MSG_DEBUG, "40 MHz pri/sec " 392 "mismatch with BSS " MACSTR 393 " <%d,%d> (chan=%d%c) vs. <%d,%d>", 394 MAC2STR(bss->bssid), 395 pri, sec, pri_chan, 396 sec > pri ? '+' : '-', 397 pri_freq, sec_freq); 398 return 0; 399 } 400 } 401 402 /* TODO: 40 MHz intolerant */ 403 } 404 405 return 1; 406} 407 408 409static void wpa_scan_results_free(struct wpa_scan_results *res) 410{ 411 size_t i; 412 413 if (res == NULL) 414 return; 415 416 for (i = 0; i < res->num; i++) 417 os_free(res->res[i]); 418 os_free(res->res); 419 os_free(res); 420} 421 422 423static void ieee80211n_check_scan(struct hostapd_iface *iface) 424{ 425 struct wpa_scan_results *scan_res; 426 int oper40; 427 428 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is 429 * allowed per IEEE 802.11n/D7.0, 11.14.3.2 */ 430 431 iface->scan_cb = NULL; 432 433 scan_res = hostapd_driver_get_scan_results(iface->bss[0]); 434 if (scan_res == NULL) { 435 hostapd_setup_interface_complete(iface, 1); 436 return; 437 } 438 439 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A) 440 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res); 441 else 442 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res); 443 wpa_scan_results_free(scan_res); 444 445 if (!oper40) { 446 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on " 447 "channel pri=%d sec=%d based on overlapping BSSes", 448 iface->conf->channel, 449 iface->conf->channel + 450 iface->conf->secondary_channel * 4); 451 iface->conf->secondary_channel = 0; 452 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET; 453 } 454 455 hostapd_setup_interface_complete(iface, 0); 456} 457 458 459static int ieee80211n_check_40mhz(struct hostapd_iface *iface) 460{ 461 struct wpa_driver_scan_params params; 462 463 if (!iface->conf->secondary_channel) 464 return 0; /* HT40 not used */ 465 466 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling " 467 "40 MHz channel"); 468 os_memset(¶ms, 0, sizeof(params)); 469 /* TODO: scan only the needed frequency */ 470 if (hostapd_driver_scan(iface->bss[0], ¶ms) < 0) { 471 wpa_printf(MSG_ERROR, "Failed to request a scan of " 472 "neighboring BSSes"); 473 return -1; 474 } 475 476 iface->scan_cb = ieee80211n_check_scan; 477 return 1; 478} 479 480 481static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface) 482{ 483 u16 hw = iface->current_mode->ht_capab; 484 u16 conf = iface->conf->ht_capab; 485 486 if (!iface->conf->ieee80211n) 487 return 1; 488 489 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) && 490 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) { 491 wpa_printf(MSG_ERROR, "Driver does not support configured " 492 "HT capability [LDPC]"); 493 return 0; 494 } 495 496 if ((conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) && 497 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) { 498 wpa_printf(MSG_ERROR, "Driver does not support configured " 499 "HT capability [HT40*]"); 500 return 0; 501 } 502 503 if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) && 504 (conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) { 505 wpa_printf(MSG_ERROR, "Driver does not support configured " 506 "HT capability [SMPS-*]"); 507 return 0; 508 } 509 510 if ((conf & HT_CAP_INFO_GREEN_FIELD) && 511 !(hw & HT_CAP_INFO_GREEN_FIELD)) { 512 wpa_printf(MSG_ERROR, "Driver does not support configured " 513 "HT capability [GF]"); 514 return 0; 515 } 516 517 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) && 518 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) { 519 wpa_printf(MSG_ERROR, "Driver does not support configured " 520 "HT capability [SHORT-GI-20]"); 521 return 0; 522 } 523 524 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) && 525 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) { 526 wpa_printf(MSG_ERROR, "Driver does not support configured " 527 "HT capability [SHORT-GI-40]"); 528 return 0; 529 } 530 531 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) { 532 wpa_printf(MSG_ERROR, "Driver does not support configured " 533 "HT capability [TX-STBC]"); 534 return 0; 535 } 536 537 if ((conf & HT_CAP_INFO_RX_STBC_MASK) > 538 (hw & HT_CAP_INFO_RX_STBC_MASK)) { 539 wpa_printf(MSG_ERROR, "Driver does not support configured " 540 "HT capability [RX-STBC*]"); 541 return 0; 542 } 543 544 if ((conf & HT_CAP_INFO_DELAYED_BA) && 545 !(hw & HT_CAP_INFO_DELAYED_BA)) { 546 wpa_printf(MSG_ERROR, "Driver does not support configured " 547 "HT capability [DELAYED-BA]"); 548 return 0; 549 } 550 551 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) && 552 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) { 553 wpa_printf(MSG_ERROR, "Driver does not support configured " 554 "HT capability [MAX-AMSDU-7935]"); 555 return 0; 556 } 557 558 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) && 559 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) { 560 wpa_printf(MSG_ERROR, "Driver does not support configured " 561 "HT capability [DSSS_CCK-40]"); 562 return 0; 563 } 564 565 if ((conf & HT_CAP_INFO_PSMP_SUPP) && !(hw & HT_CAP_INFO_PSMP_SUPP)) { 566 wpa_printf(MSG_ERROR, "Driver does not support configured " 567 "HT capability [PSMP]"); 568 return 0; 569 } 570 571 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) && 572 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) { 573 wpa_printf(MSG_ERROR, "Driver does not support configured " 574 "HT capability [LSIG-TXOP-PROT]"); 575 return 0; 576 } 577 578 return 1; 579} 580 581#endif /* CONFIG_IEEE80211N */ 582 583 584int hostapd_check_ht_capab(struct hostapd_iface *iface) 585{ 586#ifdef CONFIG_IEEE80211N 587 int ret; 588 ret = ieee80211n_check_40mhz(iface); 589 if (ret) 590 return ret; 591 if (!ieee80211n_allowed_ht40_channel_pair(iface)) 592 return -1; 593 if (!ieee80211n_supported_ht_capab(iface)) 594 return -1; 595#endif /* CONFIG_IEEE80211N */ 596 597 return 0; 598} 599 600 601/** 602 * hostapd_select_hw_mode - Select the hardware mode 603 * @iface: Pointer to interface data. 604 * Returns: 0 on success, -1 on failure 605 * 606 * Sets up the hardware mode, channel, rates, and passive scanning 607 * based on the configuration. 608 */ 609int hostapd_select_hw_mode(struct hostapd_iface *iface) 610{ 611 int i, j, ok; 612 613 if (iface->num_hw_features < 1) 614 return -1; 615 616 iface->current_mode = NULL; 617 for (i = 0; i < iface->num_hw_features; i++) { 618 struct hostapd_hw_modes *mode = &iface->hw_features[i]; 619 if (mode->mode == iface->conf->hw_mode) { 620 iface->current_mode = mode; 621 break; 622 } 623 } 624 625 if (iface->current_mode == NULL) { 626 wpa_printf(MSG_ERROR, "Hardware does not support configured " 627 "mode"); 628 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 629 HOSTAPD_LEVEL_WARNING, 630 "Hardware does not support configured mode " 631 "(%d)", (int) iface->conf->hw_mode); 632 return -1; 633 } 634 635 ok = 0; 636 for (j = 0; j < iface->current_mode->num_channels; j++) { 637 struct hostapd_channel_data *chan = 638 &iface->current_mode->channels[j]; 639 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) && 640 (chan->chan == iface->conf->channel)) { 641 ok = 1; 642 break; 643 } 644 } 645 if (iface->conf->channel == 0) { 646 /* TODO: could request a scan of neighboring BSSes and select 647 * the channel automatically */ 648 wpa_printf(MSG_ERROR, "Channel not configured " 649 "(hw_mode/channel in hostapd.conf)"); 650 return -1; 651 } 652 if (ok == 0 && iface->conf->channel != 0) { 653 hostapd_logger(iface->bss[0], NULL, 654 HOSTAPD_MODULE_IEEE80211, 655 HOSTAPD_LEVEL_WARNING, 656 "Configured channel (%d) not found from the " 657 "channel list of current mode (%d) %s", 658 iface->conf->channel, 659 iface->current_mode->mode, 660 hostapd_hw_mode_txt(iface->current_mode->mode)); 661 iface->current_mode = NULL; 662 } 663 664 if (iface->current_mode == NULL) { 665 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 666 HOSTAPD_LEVEL_WARNING, 667 "Hardware does not support configured channel"); 668 return -1; 669 } 670 671 if (hostapd_prepare_rates(iface->bss[0], iface->current_mode)) { 672 wpa_printf(MSG_ERROR, "Failed to prepare rates table."); 673 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211, 674 HOSTAPD_LEVEL_WARNING, 675 "Failed to prepare rates table."); 676 return -1; 677 } 678 679 return 0; 680} 681 682 683const char * hostapd_hw_mode_txt(int mode) 684{ 685 switch (mode) { 686 case HOSTAPD_MODE_IEEE80211A: 687 return "IEEE 802.11a"; 688 case HOSTAPD_MODE_IEEE80211B: 689 return "IEEE 802.11b"; 690 case HOSTAPD_MODE_IEEE80211G: 691 return "IEEE 802.11g"; 692 default: 693 return "UNKNOWN"; 694 } 695} 696 697 698int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan) 699{ 700 int i; 701 702 if (!hapd->iface->current_mode) 703 return 0; 704 705 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) { 706 struct hostapd_channel_data *ch = 707 &hapd->iface->current_mode->channels[i]; 708 if (ch->chan == chan) 709 return ch->freq; 710 } 711 712 return 0; 713} 714 715 716int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq) 717{ 718 int i; 719 720 if (!hapd->iface->current_mode) 721 return 0; 722 723 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) { 724 struct hostapd_channel_data *ch = 725 &hapd->iface->current_mode->channels[i]; 726 if (ch->freq == freq) 727 return ch->chan; 728 } 729 730 return 0; 731} 732