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Include nl80211 driver wrapper in default configuration for hostapd
[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
29448243
JM		 165 if ((hapd->iface->num_rates == 0 || num_basic_rates == 0) &&
166 (!hapd->iconf->ieee80211n || !hapd->iconf->require_ht)) {
6fc6879b
JM		 167 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
168 "rate sets (%d,%d).",
169 hapd->iface->num_rates, num_basic_rates);
170 return -1;
171 }
172
173 return 0;
174}
175
176
3e0cb2c5
JM		 177#ifdef CONFIG_IEEE80211N
178static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
179{
180 int sec_chan, ok, j, first;
181 int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
182 184, 192 };
183 size_t k;
184
185 if (!iface->conf->secondary_channel)
186 return 1; /* HT40 not used */
187
188 sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4;
189 wpa_printf(MSG_DEBUG, "HT40: control channel: %d "
190 "secondary channel: %d",
191 iface->conf->channel, sec_chan);
192
193 /* Verify that HT40 secondary channel is an allowed 20 MHz
194 * channel */
195 ok = 0;
196 for (j = 0; j < iface->current_mode->num_channels; j++) {
197 struct hostapd_channel_data *chan =
198 &iface->current_mode->channels[j];
199 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
200 chan->chan == sec_chan) {
201 ok = 1;
202 break;
203 }
204 }
205 if (!ok) {
206 wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
207 sec_chan);
208 return 0;
209 }
210
211 /*
212 * Verify that HT40 primary,secondary channel pair is allowed per
213 * IEEE 802.11n Annex J. This is only needed for 5 GHz band since
214 * 2.4 GHz rules allow all cases where the secondary channel fits into
215 * the list of allowed channels (already checked above).
216 */
217 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
218 return 1;
219
220 if (iface->conf->secondary_channel > 0)
221 first = iface->conf->channel;
222 else
223 first = sec_chan;
224
225 ok = 0;
226 for (k = 0; k < sizeof(allowed) / sizeof(allowed[0]); k++) {
227 if (first == allowed[k]) {
228 ok = 1;
229 break;
230 }
231 }
232 if (!ok) {
233 wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
234 iface->conf->channel,
235 iface->conf->secondary_channel);
236 return 0;
237 }
238
239 return 1;
240}
30fd5f14
JM		 241
242
5eb4e3d0
JM		 243static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
244{
245 if (iface->conf->secondary_channel > 0) {
246 iface->conf->channel += 4;
247 iface->conf->secondary_channel = -1;
248 } else {
249 iface->conf->channel -= 4;
250 iface->conf->secondary_channel = 1;
251 }
252}
253
254
ad1e68e6
JM		 255static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss,
256 int *pri_chan, int *sec_chan)
257{
258 struct ieee80211_ht_operation *oper;
259 struct ieee802_11_elems elems;
260
261 *pri_chan = *sec_chan = 0;
262
263 ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
264 if (elems.ht_operation &&
265 elems.ht_operation_len >= sizeof(*oper)) {
266 oper = (struct ieee80211_ht_operation *) elems.ht_operation;
267 *pri_chan = oper->control_chan;
268 if (oper->ht_param & HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH) {
41619262
JM		 269 int sec = oper->ht_param &
270 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
271 if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
ad1e68e6 272 *sec_chan = *pri_chan + 4;
41619262 273 else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
ad1e68e6
JM		 274 *sec_chan = *pri_chan - 4;
275 }
276 }
277}
278
279
280static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
281 struct wpa_scan_results *scan_res)
5eb4e3d0
JM		 282{
283 int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss;
ad1e68e6
JM		 284 int bss_pri_chan, bss_sec_chan;
285 size_t i;
5eb4e3d0
JM		 286 int match;
287
288 pri_chan = iface->conf->channel;
289 sec_chan = iface->conf->secondary_channel * 4;
290 pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan);
291 if (iface->conf->secondary_channel > 0)
292 sec_freq = pri_freq + 20;
293 else
294 sec_freq = pri_freq - 20;
295
5eb4e3d0
JM		 296 /*
297 * Switch PRI/SEC channels if Beacons were detected on selected SEC
298 * channel, but not on selected PRI channel.
299 */
300 pri_bss = sec_bss = 0;
ad1e68e6
JM		 301 for (i = 0; i < scan_res->num; i++) {
302 struct wpa_scan_res *bss = scan_res->res[i];
303 if (bss->freq == pri_freq)
5eb4e3d0 304 pri_bss++;
ad1e68e6 305 else if (bss->freq == sec_freq)
5eb4e3d0
JM		 306 sec_bss++;
307 }
308 if (sec_bss && !pri_bss) {
309 wpa_printf(MSG_INFO, "Switch own primary and secondary "
310 "channel to get secondary channel with no Beacons "
311 "from other BSSes");
312 ieee80211n_switch_pri_sec(iface);
313 }
314
315 /*
316 * Match PRI/SEC channel with any existing HT40 BSS on the same
317 * channels that we are about to use (if already mixed order in
318 * existing BSSes, use own preference).
319 */
320 match = 0;
ad1e68e6
JM		 321 for (i = 0; i < scan_res->num; i++) {
322 struct wpa_scan_res *bss = scan_res->res[i];
323 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
324 if (pri_chan == bss_pri_chan &&
325 sec_chan == bss_sec_chan) {
5eb4e3d0
JM		 326 match = 1;
327 break;
328 }
329 }
330 if (!match) {
ad1e68e6
JM		 331 for (i = 0; i < scan_res->num; i++) {
332 struct wpa_scan_res *bss = scan_res->res[i];
c6313c75
FF		 333 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
334 &bss_sec_chan);
ad1e68e6
JM		 335 if (pri_chan == bss_sec_chan &&
336 sec_chan == bss_pri_chan) {
5eb4e3d0
JM		 337 wpa_printf(MSG_INFO, "Switch own primary and "
338 "secondary channel due to BSS "
339 "overlap with " MACSTR,
ad1e68e6 340 MAC2STR(bss->bssid));
5eb4e3d0
JM		 341 ieee80211n_switch_pri_sec(iface);
342 break;
343 }
344 }
345 }
346
347 return 1;
348}
349
350
ad1e68e6
JM		 351static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
352 struct wpa_scan_results *scan_res)
5eb4e3d0
JM		 353{
354 int pri_freq, sec_freq;
355 int affected_start, affected_end;
ad1e68e6 356 size_t i;
5eb4e3d0
JM		 357
358 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
359 if (iface->conf->secondary_channel > 0)
360 sec_freq = pri_freq + 20;
361 else
362 sec_freq = pri_freq - 20;
363 affected_start = (pri_freq + sec_freq) / 2 - 25;
364 affected_end = (pri_freq + sec_freq) / 2 + 25;
365 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
366 affected_start, affected_end);
ad1e68e6
JM		 367 for (i = 0; i < scan_res->num; i++) {
368 struct wpa_scan_res *bss = scan_res->res[i];
369 int pri = bss->freq;
5eb4e3d0 370 int sec = pri;
ad1e68e6
JM		 371 int sec_chan, pri_chan;
372
373 ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan);
374
375 if (sec_chan) {
376 if (sec_chan < pri_chan)
5eb4e3d0
JM		 377 sec = pri - 20;
378 else
379 sec = pri + 20;
380 }
381
382 if ((pri < affected_start || pri > affected_end) &&
383 (sec < affected_start || sec > affected_end))
384 continue; /* not within affected channel range */
385
ad1e68e6
JM		 386 wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
387 " freq=%d pri=%d sec=%d",
388 MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
389
390 if (sec_chan) {
5eb4e3d0
JM		 391 if (pri_freq != pri || sec_freq != sec) {
392 wpa_printf(MSG_DEBUG, "40 MHz pri/sec "
393 "mismatch with BSS " MACSTR
394 " <%d,%d> (chan=%d%c) vs. <%d,%d>",
ad1e68e6
JM		 395 MAC2STR(bss->bssid),
396 pri, sec, pri_chan,
5eb4e3d0
JM		 397 sec > pri ? '+' : '-',
398 pri_freq, sec_freq);
399 return 0;
400 }
401 }
402
403 /* TODO: 40 MHz intolerant */
404 }
405
406 return 1;
407}
408
409
d1f9c410
JM		 410static void wpa_scan_results_free(struct wpa_scan_results *res)
411{
412 size_t i;
413
414 if (res == NULL)
415 return;
416
417 for (i = 0; i < res->num; i++)
418 os_free(res->res[i]);
419 os_free(res->res);
420 os_free(res);
421}
422
423
ad1e68e6 424static void ieee80211n_check_scan(struct hostapd_iface *iface)
5eb4e3d0 425{
ad1e68e6 426 struct wpa_scan_results *scan_res;
5eb4e3d0 427 int oper40;
7615078c 428 int res;
5eb4e3d0 429
5eb4e3d0
JM		 430 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
431 * allowed per IEEE 802.11n/D7.0, 11.14.3.2 */
432
ad1e68e6
JM		 433 iface->scan_cb = NULL;
434
435 scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
436 if (scan_res == NULL) {
437 hostapd_setup_interface_complete(iface, 1);
438 return;
439 }
440
5eb4e3d0 441 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
ad1e68e6 442 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
5eb4e3d0 443 else
ad1e68e6
JM		 444 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
445 wpa_scan_results_free(scan_res);
5eb4e3d0
JM		 446
447 if (!oper40) {
448 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
449 "channel pri=%d sec=%d based on overlapping BSSes",
450 iface->conf->channel,
451 iface->conf->channel +
452 iface->conf->secondary_channel * 4);
453 iface->conf->secondary_channel = 0;
454 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
455 }
ad1e68e6 456
7615078c
JM		 457 res = ieee80211n_allowed_ht40_channel_pair(iface);
458 hostapd_setup_interface_complete(iface, !res);
ad1e68e6
JM		 459}
460
461
462static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
463{
464 struct wpa_driver_scan_params params;
465
466 if (!iface->conf->secondary_channel)
467 return 0; /* HT40 not used */
468
469 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
470 "40 MHz channel");
471 os_memset(&params, 0, sizeof(params));
472 /* TODO: scan only the needed frequency */
473 if (hostapd_driver_scan(iface->bss[0], &params) < 0) {
474 wpa_printf(MSG_ERROR, "Failed to request a scan of "
475 "neighboring BSSes");
476 return -1;
477 }
478
479 iface->scan_cb = ieee80211n_check_scan;
480 return 1;
5eb4e3d0
JM		 481}
482
483
30fd5f14
JM		 484static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
485{
486 u16 hw = iface->current_mode->ht_capab;
487 u16 conf = iface->conf->ht_capab;
488
30fd5f14
JM		 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;
ec2b8909
SM		 588 if (!iface->conf->ieee80211n)
589 return 0;
1b4d3793
NS		 590 if (!ieee80211n_supported_ht_capab(iface))
591 return -1;
ad1e68e6
JM		 592 ret = ieee80211n_check_40mhz(iface);
593 if (ret)
594 return ret;
595 if (!ieee80211n_allowed_ht40_channel_pair(iface))
596 return -1;
3e0cb2c5
JM		 597#endif /* CONFIG_IEEE80211N */
598
ad1e68e6
JM		 599 return 0;
600}
601
3e0cb2c5 602
6fc6879b 603/**
ddaa83eb 604 * hostapd_select_hw_mode - Select the hardware mode
6fc6879b 605 * @iface: Pointer to interface data.
ddaa83eb 606 * Returns: 0 on success, -1 on failure
6fc6879b 607 *
ddaa83eb
JM		 608 * Sets up the hardware mode, channel, rates, and passive scanning
609 * based on the configuration.
6fc6879b 610 */
ddaa83eb 611int hostapd_select_hw_mode(struct hostapd_iface *iface)
6fc6879b 612{
61693eaa 613 int i, j, ok;
6fc6879b
JM		 614
615 if (iface->num_hw_features < 1)
616 return -1;
617
618 iface->current_mode = NULL;
619 for (i = 0; i < iface->num_hw_features; i++) {
620 struct hostapd_hw_modes *mode = &iface->hw_features[i];
6caf9ca6 621 if (mode->mode == iface->conf->hw_mode) {
6fc6879b
JM		 622 iface->current_mode = mode;
623 break;
624 }
625 }
626
627 if (iface->current_mode == NULL) {
628 wpa_printf(MSG_ERROR, "Hardware does not support configured "
629 "mode");
630 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
631 HOSTAPD_LEVEL_WARNING,
632 "Hardware does not support configured mode "
633 "(%d)", (int) iface->conf->hw_mode);
634 return -1;
635 }
636
637 ok = 0;
638 for (j = 0; j < iface->current_mode->num_channels; j++) {
639 struct hostapd_channel_data *chan =
640 &iface->current_mode->channels[j];
10b83bd7 641 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
6fc6879b
JM		 642 (chan->chan == iface->conf->channel)) {
643 ok = 1;
644 break;
645 }
646 }
8ea3dd21
JM		 647 if (ok && iface->conf->secondary_channel) {
648 int sec_ok = 0;
649 int sec_chan = iface->conf->channel +
650 iface->conf->secondary_channel * 4;
651 for (j = 0; j < iface->current_mode->num_channels; j++) {
652 struct hostapd_channel_data *chan =
653 &iface->current_mode->channels[j];
654 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
655 (chan->chan == sec_chan)) {
656 sec_ok = 1;
657 break;
658 }
659 }
660 if (!sec_ok) {
661 hostapd_logger(iface->bss[0], NULL,
662 HOSTAPD_MODULE_IEEE80211,
663 HOSTAPD_LEVEL_WARNING,
664 "Configured HT40 secondary channel "
665 "(%d) not found from the channel list "
666 "of current mode (%d) %s",
667 sec_chan, iface->current_mode->mode,
668 hostapd_hw_mode_txt(
669 iface->current_mode->mode));
670 ok = 0;
671 }
672 }
24c9fceb
JM		 673 if (iface->conf->channel == 0) {
674 /* TODO: could request a scan of neighboring BSSes and select
675 * the channel automatically */
676 wpa_printf(MSG_ERROR, "Channel not configured "
677 "(hw_mode/channel in hostapd.conf)");
678 return -1;
679 }
6fc6879b
JM		 680 if (ok == 0 && iface->conf->channel != 0) {
681 hostapd_logger(iface->bss[0], NULL,
682 HOSTAPD_MODULE_IEEE80211,
683 HOSTAPD_LEVEL_WARNING,
684 "Configured channel (%d) not found from the "
685 "channel list of current mode (%d) %s",
686 iface->conf->channel,
687 iface->current_mode->mode,
688 hostapd_hw_mode_txt(iface->current_mode->mode));
689 iface->current_mode = NULL;
690 }
691
ddaa83eb
JM		 692 if (iface->current_mode == NULL) {
693 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
694 HOSTAPD_LEVEL_WARNING,
695 "Hardware does not support configured channel");
6fc6879b
JM		 696 return -1;
697 }
698
61693eaa 699 return 0;
6fc6879b
JM		 700}
701
702
703const char * hostapd_hw_mode_txt(int mode)
704{
705 switch (mode) {
706 case HOSTAPD_MODE_IEEE80211A:
707 return "IEEE 802.11a";
708 case HOSTAPD_MODE_IEEE80211B:
709 return "IEEE 802.11b";
710 case HOSTAPD_MODE_IEEE80211G:
711 return "IEEE 802.11g";
712 default:
713 return "UNKNOWN";
714 }
715}
716
717
718int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
719{
720 int i;
721
722 if (!hapd->iface->current_mode)
723 return 0;
724
725 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
726 struct hostapd_channel_data *ch =
727 &hapd->iface->current_mode->channels[i];
728 if (ch->chan == chan)
729 return ch->freq;
730 }
731
732 return 0;
733}
734
735
736int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
737{
738 int i;
739
740 if (!hapd->iface->current_mode)
741 return 0;
742
743 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
744 struct hostapd_channel_data *ch =
745 &hapd->iface->current_mode->channels[i];
746 if (ch->freq == freq)
747 return ch->chan;
748 }
749
750 return 0;
751}
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