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AP: Ensure ieee80211n_supported_ht_capab() gets called to check ht caps
[thirdparty/hostap.git] / src / ap / hw_features.c
CommitLineData
6fc6879b
JM		 1/*
2 * hostapd / Hardware feature query and different modes
3 * Copyright 2002-2003, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
1057d78e 5 * Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi>
6fc6879b
JM		 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
1057d78e 17#include "utils/includes.h"
6fc6879b 18
1057d78e
JM		 19#include "utils/common.h"
20#include "utils/eloop.h"
90973fb2
JM		 21#include "common/ieee802_11_defs.h"
22#include "common/ieee802_11_common.h"
6e6e8c31 23#include "drivers/driver.h"
6226e38d
JM		 24#include "hostapd.h"
25#include "ap_config.h"
6e6e8c31 26#include "ap_drv_ops.h"
6226e38d 27#include "hw_features.h"
6fc6879b
JM		 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
85141289
JM		 54 if (hostapd_drv_none(hapd))
55 return -1;
6fc6879b
JM		 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++) {
10b83bd7
JM		 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))
6fc6879b 87 feature->channels[j].flag |=
10b83bd7
JM		 88 HOSTAPD_CHAN_DISABLED;
89 if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
90 continue;
91 wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
bf01d8bc 92 "chan=%d freq=%d MHz max_tx_power=%d dBm",
10b83bd7
JM		 93 feature->mode,
94 feature->channels[j].chan,
bf01d8bc
JM		 95 feature->channels[j].freq,
96 feature->channels[j].max_tx_power);
6fc6879b
JM		 97 }
98 }
99
100 return ret;
101}
102
103
5a5009dc
FF		 104int hostapd_prepare_rates(struct hostapd_data *hapd,
105 struct hostapd_hw_modes *mode)
6fc6879b
JM		 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 =
fb7842aa 139 os_zalloc(mode->num_rates * sizeof(struct hostapd_rate_data));
6fc6879b
JM		 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,
fb7842aa 151 mode->rates[i]))
6fc6879b
JM		 152 continue;
153
154 rate = &hapd->iface->current_rates[hapd->iface->num_rates];
fb7842aa 155 rate->rate = mode->rates[i];
6fc6879b
JM		 156 if (hostapd_rate_found(basic_rates, rate->rate)) {
157 rate->flags |= HOSTAPD_RATE_BASIC;
158 num_basic_rates++;
fb7842aa 159 }
6fc6879b
JM		 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
3e0cb2c5
JM		 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}
30fd5f14
JM		 240
241
5eb4e3d0
JM		 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
ad1e68e6
JM		 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) {
41619262
JM		 268 int sec = oper->ht_param &
269 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
270 if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
ad1e68e6 271 *sec_chan = *pri_chan + 4;
41619262 272 else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
ad1e68e6
JM		 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)
5eb4e3d0
JM		 281{
282 int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss;
ad1e68e6
JM		 283 int bss_pri_chan, bss_sec_chan;
284 size_t i;
5eb4e3d0
JM		 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
5eb4e3d0
JM		 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;
ad1e68e6
JM		 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)
5eb4e3d0 303 pri_bss++;
ad1e68e6 304 else if (bss->freq == sec_freq)
5eb4e3d0
JM		 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;
ad1e68e6
JM		 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) {
5eb4e3d0
JM		 325 match = 1;
326 break;
327 }
328 }
329 if (!match) {
ad1e68e6
JM		 330 for (i = 0; i < scan_res->num; i++) {
331 struct wpa_scan_res *bss = scan_res->res[i];
c6313c75
FF		 332 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
333 &bss_sec_chan);
ad1e68e6
JM		 334 if (pri_chan == bss_sec_chan &&
335 sec_chan == bss_pri_chan) {
5eb4e3d0
JM		 336 wpa_printf(MSG_INFO, "Switch own primary and "
337 "secondary channel due to BSS "
338 "overlap with " MACSTR,
ad1e68e6 339 MAC2STR(bss->bssid));
5eb4e3d0
JM		 340 ieee80211n_switch_pri_sec(iface);
341 break;
342 }
343 }
344 }
345
346 return 1;
347}
348
349
ad1e68e6
JM		 350static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
351 struct wpa_scan_results *scan_res)
5eb4e3d0
JM		 352{
353 int pri_freq, sec_freq;
354 int affected_start, affected_end;
ad1e68e6 355 size_t i;
5eb4e3d0
JM		 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);
ad1e68e6
JM		 366 for (i = 0; i < scan_res->num; i++) {
367 struct wpa_scan_res *bss = scan_res->res[i];
368 int pri = bss->freq;
5eb4e3d0 369 int sec = pri;
ad1e68e6
JM		 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)
5eb4e3d0
JM		 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
ad1e68e6
JM		 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) {
5eb4e3d0
JM		 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>",
ad1e68e6
JM		 394 MAC2STR(bss->bssid),
395 pri, sec, pri_chan,
5eb4e3d0
JM		 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
d1f9c410
JM		 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
ad1e68e6 423static void ieee80211n_check_scan(struct hostapd_iface *iface)
5eb4e3d0 424{
ad1e68e6 425 struct wpa_scan_results *scan_res;
5eb4e3d0
JM		 426 int oper40;
427
5eb4e3d0
JM		 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
ad1e68e6
JM		 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
5eb4e3d0 439 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
ad1e68e6 440 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
5eb4e3d0 441 else
ad1e68e6
JM		 442 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
443 wpa_scan_results_free(scan_res);
5eb4e3d0
JM		 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 }
ad1e68e6
JM		 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(&params, 0, sizeof(params));
469 /* TODO: scan only the needed frequency */
470 if (hostapd_driver_scan(iface->bss[0], &params) < 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;
5eb4e3d0
JM		 478}
479
480
30fd5f14
JM		 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}
ad1e68e6
JM		 580
581#endif /* CONFIG_IEEE80211N */
582
583
584int hostapd_check_ht_capab(struct hostapd_iface *iface)
585{
586#ifdef CONFIG_IEEE80211N
587 int ret;
1b4d3793
NS		 588 if (!ieee80211n_supported_ht_capab(iface))
589 return -1;
ad1e68e6
JM		 590 ret = ieee80211n_check_40mhz(iface);
591 if (ret)
592 return ret;
593 if (!ieee80211n_allowed_ht40_channel_pair(iface))
594 return -1;
3e0cb2c5
JM		 595#endif /* CONFIG_IEEE80211N */
596
ad1e68e6
JM		 597 return 0;
598}
599
3e0cb2c5 600
6fc6879b 601/**
ddaa83eb 602 * hostapd_select_hw_mode - Select the hardware mode
6fc6879b 603 * @iface: Pointer to interface data.
ddaa83eb 604 * Returns: 0 on success, -1 on failure
6fc6879b 605 *
ddaa83eb
JM		 606 * Sets up the hardware mode, channel, rates, and passive scanning
607 * based on the configuration.
6fc6879b 608 */
ddaa83eb 609int hostapd_select_hw_mode(struct hostapd_iface *iface)
6fc6879b 610{
61693eaa 611 int i, j, ok;
6fc6879b
JM		 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];
6caf9ca6 619 if (mode->mode == iface->conf->hw_mode) {
6fc6879b
JM		 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];
10b83bd7 639 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
6fc6879b
JM		 640 (chan->chan == iface->conf->channel)) {
641 ok = 1;
642 break;
643 }
644 }
8ea3dd21
JM		 645 if (ok && iface->conf->secondary_channel) {
646 int sec_ok = 0;
647 int sec_chan = iface->conf->channel +
648 iface->conf->secondary_channel * 4;
649 for (j = 0; j < iface->current_mode->num_channels; j++) {
650 struct hostapd_channel_data *chan =
651 &iface->current_mode->channels[j];
652 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
653 (chan->chan == sec_chan)) {
654 sec_ok = 1;
655 break;
656 }
657 }
658 if (!sec_ok) {
659 hostapd_logger(iface->bss[0], NULL,
660 HOSTAPD_MODULE_IEEE80211,
661 HOSTAPD_LEVEL_WARNING,
662 "Configured HT40 secondary channel "
663 "(%d) not found from the channel list "
664 "of current mode (%d) %s",
665 sec_chan, iface->current_mode->mode,
666 hostapd_hw_mode_txt(
667 iface->current_mode->mode));
668 ok = 0;
669 }
670 }
24c9fceb
JM		 671 if (iface->conf->channel == 0) {
672 /* TODO: could request a scan of neighboring BSSes and select
673 * the channel automatically */
674 wpa_printf(MSG_ERROR, "Channel not configured "
675 "(hw_mode/channel in hostapd.conf)");
676 return -1;
677 }
6fc6879b
JM		 678 if (ok == 0 && iface->conf->channel != 0) {
679 hostapd_logger(iface->bss[0], NULL,
680 HOSTAPD_MODULE_IEEE80211,
681 HOSTAPD_LEVEL_WARNING,
682 "Configured channel (%d) not found from the "
683 "channel list of current mode (%d) %s",
684 iface->conf->channel,
685 iface->current_mode->mode,
686 hostapd_hw_mode_txt(iface->current_mode->mode));
687 iface->current_mode = NULL;
688 }
689
ddaa83eb
JM		 690 if (iface->current_mode == NULL) {
691 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
692 HOSTAPD_LEVEL_WARNING,
693 "Hardware does not support configured channel");
6fc6879b
JM		 694 return -1;
695 }
696
61693eaa 697 return 0;
6fc6879b
JM		 698}
699
700
701const char * hostapd_hw_mode_txt(int mode)
702{
703 switch (mode) {
704 case HOSTAPD_MODE_IEEE80211A:
705 return "IEEE 802.11a";
706 case HOSTAPD_MODE_IEEE80211B:
707 return "IEEE 802.11b";
708 case HOSTAPD_MODE_IEEE80211G:
709 return "IEEE 802.11g";
710 default:
711 return "UNKNOWN";
712 }
713}
714
715
716int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
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->chan == chan)
727 return ch->freq;
728 }
729
730 return 0;
731}
732
733
734int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
735{
736 int i;
737
738 if (!hapd->iface->current_mode)
739 return 0;
740
741 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
742 struct hostapd_channel_data *ch =
743 &hapd->iface->current_mode->channels[i];
744 if (ch->freq == freq)
745 return ch->chan;
746 }
747
748 return 0;
749}
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