Line data Source code
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@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 "hostapd.h"
19 : #include "ap_config.h"
20 : #include "ap_drv_ops.h"
21 : #include "acs.h"
22 : #include "ieee802_11.h"
23 : #include "beacon.h"
24 : #include "hw_features.h"
25 :
26 :
27 1367 : void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
28 : size_t num_hw_features)
29 : {
30 : size_t i;
31 :
32 1367 : if (hw_features == NULL)
33 2058 : return;
34 :
35 2704 : for (i = 0; i < num_hw_features; i++) {
36 2028 : os_free(hw_features[i].channels);
37 2028 : os_free(hw_features[i].rates);
38 : }
39 :
40 676 : os_free(hw_features);
41 : }
42 :
43 :
44 : #ifndef CONFIG_NO_STDOUT_DEBUG
45 15 : static char * dfs_info(struct hostapd_channel_data *chan)
46 : {
47 : static char info[256];
48 : char *state;
49 :
50 15 : switch (chan->flag & HOSTAPD_CHAN_DFS_MASK) {
51 : case HOSTAPD_CHAN_DFS_UNKNOWN:
52 0 : state = "unknown";
53 0 : break;
54 : case HOSTAPD_CHAN_DFS_USABLE:
55 15 : state = "usable";
56 15 : break;
57 : case HOSTAPD_CHAN_DFS_UNAVAILABLE:
58 0 : state = "unavailable";
59 0 : break;
60 : case HOSTAPD_CHAN_DFS_AVAILABLE:
61 0 : state = "available";
62 0 : break;
63 : default:
64 0 : return "";
65 : }
66 15 : os_snprintf(info, sizeof(info), " (DFS state = %s)", state);
67 15 : info[sizeof(info) - 1] = '\0';
68 :
69 15 : return info;
70 : }
71 : #endif /* CONFIG_NO_STDOUT_DEBUG */
72 :
73 :
74 678 : int hostapd_get_hw_features(struct hostapd_iface *iface)
75 : {
76 678 : struct hostapd_data *hapd = iface->bss[0];
77 678 : int ret = 0, i, j;
78 : u16 num_modes, flags;
79 : struct hostapd_hw_modes *modes;
80 :
81 678 : if (hostapd_drv_none(hapd))
82 2 : return -1;
83 676 : modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
84 676 : if (modes == NULL) {
85 0 : hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
86 : HOSTAPD_LEVEL_DEBUG,
87 : "Fetching hardware channel/rate support not "
88 : "supported.");
89 0 : return -1;
90 : }
91 :
92 676 : iface->hw_flags = flags;
93 :
94 676 : hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
95 676 : iface->hw_features = modes;
96 676 : iface->num_hw_features = num_modes;
97 :
98 2704 : for (i = 0; i < num_modes; i++) {
99 2028 : struct hostapd_hw_modes *feature = &modes[i];
100 2031 : int dfs_enabled = hapd->iconf->ieee80211h &&
101 3 : (iface->drv_flags & WPA_DRIVER_FLAGS_RADAR);
102 :
103 : /* set flag for channels we can use in current regulatory
104 : * domain */
105 37180 : for (j = 0; j < feature->num_channels; j++) {
106 35152 : int dfs = 0;
107 :
108 : /*
109 : * Disable all channels that are marked not to allow
110 : * IBSS operation or active scanning.
111 : * Use radar channels only if the driver supports DFS.
112 : */
113 35152 : if ((feature->channels[j].flag &
114 10136 : HOSTAPD_CHAN_RADAR) && dfs_enabled) {
115 15 : dfs = 1;
116 35137 : } else if (((feature->channels[j].flag &
117 10121 : HOSTAPD_CHAN_RADAR) &&
118 10121 : !(iface->drv_flags &
119 25016 : WPA_DRIVER_FLAGS_DFS_OFFLOAD)) ||
120 25016 : (feature->channels[j].flag &
121 : (HOSTAPD_CHAN_NO_IBSS |
122 : HOSTAPD_CHAN_PASSIVE_SCAN))) {
123 18672 : feature->channels[j].flag |=
124 : HOSTAPD_CHAN_DISABLED;
125 : }
126 :
127 35152 : if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
128 18672 : continue;
129 :
130 82415 : wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
131 : "chan=%d freq=%d MHz max_tx_power=%d dBm%s",
132 16480 : feature->mode,
133 16480 : feature->channels[j].chan,
134 16480 : feature->channels[j].freq,
135 16480 : feature->channels[j].max_tx_power,
136 15 : dfs ? dfs_info(&feature->channels[j]) : "");
137 : }
138 : }
139 :
140 676 : return ret;
141 : }
142 :
143 :
144 663 : int hostapd_prepare_rates(struct hostapd_iface *iface,
145 : struct hostapd_hw_modes *mode)
146 : {
147 663 : int i, num_basic_rates = 0;
148 663 : int basic_rates_a[] = { 60, 120, 240, -1 };
149 663 : int basic_rates_b[] = { 10, 20, -1 };
150 663 : int basic_rates_g[] = { 10, 20, 55, 110, -1 };
151 : int *basic_rates;
152 :
153 663 : if (iface->conf->basic_rates)
154 116 : basic_rates = iface->conf->basic_rates;
155 547 : else switch (mode->mode) {
156 : case HOSTAPD_MODE_IEEE80211A:
157 19 : basic_rates = basic_rates_a;
158 19 : break;
159 : case HOSTAPD_MODE_IEEE80211B:
160 3 : basic_rates = basic_rates_b;
161 3 : break;
162 : case HOSTAPD_MODE_IEEE80211G:
163 525 : basic_rates = basic_rates_g;
164 525 : break;
165 : case HOSTAPD_MODE_IEEE80211AD:
166 0 : return 0; /* No basic rates for 11ad */
167 : default:
168 0 : return -1;
169 : }
170 :
171 663 : i = 0;
172 3846 : while (basic_rates[i] >= 0)
173 2520 : i++;
174 663 : if (i)
175 663 : i++; /* -1 termination */
176 663 : os_free(iface->basic_rates);
177 663 : iface->basic_rates = os_malloc(i * sizeof(int));
178 663 : if (iface->basic_rates)
179 663 : os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int));
180 :
181 663 : os_free(iface->current_rates);
182 663 : iface->num_rates = 0;
183 :
184 663 : iface->current_rates =
185 663 : os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data));
186 663 : if (!iface->current_rates) {
187 0 : wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
188 : "table.");
189 0 : return -1;
190 : }
191 :
192 8519 : for (i = 0; i < mode->num_rates; i++) {
193 : struct hostapd_rate_data *rate;
194 :
195 9256 : if (iface->conf->supported_rates &&
196 1400 : !hostapd_rate_found(iface->conf->supported_rates,
197 1400 : mode->rates[i]))
198 468 : continue;
199 :
200 7388 : rate = &iface->current_rates[iface->num_rates];
201 7388 : rate->rate = mode->rates[i];
202 7388 : if (hostapd_rate_found(basic_rates, rate->rate)) {
203 2516 : rate->flags |= HOSTAPD_RATE_BASIC;
204 2516 : num_basic_rates++;
205 : }
206 7388 : wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
207 : iface->num_rates, rate->rate, rate->flags);
208 7388 : iface->num_rates++;
209 : }
210 :
211 664 : if ((iface->num_rates == 0 || num_basic_rates == 0) &&
212 2 : (!iface->conf->ieee80211n || !iface->conf->require_ht)) {
213 0 : wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
214 : "rate sets (%d,%d).",
215 : iface->num_rates, num_basic_rates);
216 0 : return -1;
217 : }
218 :
219 663 : return 0;
220 : }
221 :
222 :
223 : #ifdef CONFIG_IEEE80211N
224 659 : static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
225 : {
226 : int sec_chan, ok, j, first;
227 659 : int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
228 : 184, 192 };
229 : size_t k;
230 :
231 659 : if (!iface->conf->secondary_channel)
232 637 : return 1; /* HT40 not used */
233 :
234 22 : sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4;
235 22 : wpa_printf(MSG_DEBUG, "HT40: control channel: %d "
236 : "secondary channel: %d",
237 22 : iface->conf->channel, sec_chan);
238 :
239 : /* Verify that HT40 secondary channel is an allowed 20 MHz
240 : * channel */
241 22 : ok = 0;
242 61 : for (j = 0; j < iface->current_mode->num_channels; j++) {
243 61 : struct hostapd_channel_data *chan =
244 61 : &iface->current_mode->channels[j];
245 122 : if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
246 61 : chan->chan == sec_chan) {
247 22 : ok = 1;
248 22 : break;
249 : }
250 : }
251 22 : if (!ok) {
252 0 : wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
253 : sec_chan);
254 0 : return 0;
255 : }
256 :
257 : /*
258 : * Verify that HT40 primary,secondary channel pair is allowed per
259 : * IEEE 802.11n Annex J. This is only needed for 5 GHz band since
260 : * 2.4 GHz rules allow all cases where the secondary channel fits into
261 : * the list of allowed channels (already checked above).
262 : */
263 22 : if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
264 13 : return 1;
265 :
266 9 : if (iface->conf->secondary_channel > 0)
267 9 : first = iface->conf->channel;
268 : else
269 0 : first = sec_chan;
270 :
271 9 : ok = 0;
272 9 : for (k = 0; k < ARRAY_SIZE(allowed); k++) {
273 9 : if (first == allowed[k]) {
274 9 : ok = 1;
275 9 : break;
276 : }
277 : }
278 9 : if (!ok) {
279 0 : wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
280 0 : iface->conf->channel,
281 0 : iface->conf->secondary_channel);
282 0 : return 0;
283 : }
284 :
285 9 : return 1;
286 : }
287 :
288 :
289 2 : static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
290 : {
291 2 : if (iface->conf->secondary_channel > 0) {
292 0 : iface->conf->channel += 4;
293 0 : iface->conf->secondary_channel = -1;
294 : } else {
295 2 : iface->conf->channel -= 4;
296 2 : iface->conf->secondary_channel = 1;
297 : }
298 2 : }
299 :
300 :
301 6 : static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss,
302 : int *pri_chan, int *sec_chan)
303 : {
304 : struct ieee80211_ht_operation *oper;
305 : struct ieee802_11_elems elems;
306 :
307 6 : *pri_chan = *sec_chan = 0;
308 :
309 6 : ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
310 12 : if (elems.ht_operation &&
311 6 : elems.ht_operation_len >= sizeof(*oper)) {
312 6 : oper = (struct ieee80211_ht_operation *) elems.ht_operation;
313 6 : *pri_chan = oper->primary_chan;
314 6 : if (oper->ht_param & HT_INFO_HT_PARAM_STA_CHNL_WIDTH) {
315 5 : int sec = oper->ht_param &
316 : HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
317 5 : if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
318 4 : *sec_chan = *pri_chan + 4;
319 1 : else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
320 1 : *sec_chan = *pri_chan - 4;
321 : }
322 : }
323 6 : }
324 :
325 :
326 9 : static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
327 : struct wpa_scan_results *scan_res)
328 : {
329 : int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss;
330 : int bss_pri_chan, bss_sec_chan;
331 : size_t i;
332 : int match;
333 :
334 9 : pri_chan = iface->conf->channel;
335 9 : sec_chan = pri_chan + iface->conf->secondary_channel * 4;
336 9 : pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan);
337 9 : if (iface->conf->secondary_channel > 0)
338 7 : sec_freq = pri_freq + 20;
339 : else
340 2 : sec_freq = pri_freq - 20;
341 :
342 : /*
343 : * Switch PRI/SEC channels if Beacons were detected on selected SEC
344 : * channel, but not on selected PRI channel.
345 : */
346 9 : pri_bss = sec_bss = 0;
347 13 : for (i = 0; i < scan_res->num; i++) {
348 4 : struct wpa_scan_res *bss = scan_res->res[i];
349 4 : if (bss->freq == pri_freq)
350 2 : pri_bss++;
351 2 : else if (bss->freq == sec_freq)
352 2 : sec_bss++;
353 : }
354 9 : if (sec_bss && !pri_bss) {
355 1 : wpa_printf(MSG_INFO, "Switch own primary and secondary "
356 : "channel to get secondary channel with no Beacons "
357 : "from other BSSes");
358 1 : ieee80211n_switch_pri_sec(iface);
359 1 : return 1;
360 : }
361 :
362 : /*
363 : * Match PRI/SEC channel with any existing HT40 BSS on the same
364 : * channels that we are about to use (if already mixed order in
365 : * existing BSSes, use own preference).
366 : */
367 8 : match = 0;
368 10 : for (i = 0; i < scan_res->num; i++) {
369 3 : struct wpa_scan_res *bss = scan_res->res[i];
370 3 : ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
371 5 : if (pri_chan == bss_pri_chan &&
372 2 : sec_chan == bss_sec_chan) {
373 1 : match = 1;
374 1 : break;
375 : }
376 : }
377 8 : if (!match) {
378 7 : for (i = 0; i < scan_res->num; i++) {
379 1 : struct wpa_scan_res *bss = scan_res->res[i];
380 1 : ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
381 : &bss_sec_chan);
382 2 : if (pri_chan == bss_sec_chan &&
383 1 : sec_chan == bss_pri_chan) {
384 6 : wpa_printf(MSG_INFO, "Switch own primary and "
385 : "secondary channel due to BSS "
386 : "overlap with " MACSTR,
387 6 : MAC2STR(bss->bssid));
388 1 : ieee80211n_switch_pri_sec(iface);
389 1 : break;
390 : }
391 : }
392 : }
393 :
394 8 : return 1;
395 : }
396 :
397 :
398 3 : static int ieee80211n_check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq,
399 : int start, int end)
400 : {
401 : struct ieee802_11_elems elems;
402 : struct ieee80211_ht_operation *oper;
403 :
404 3 : if (bss->freq < start || bss->freq > end || bss->freq == pri_freq)
405 1 : return 0;
406 :
407 2 : ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
408 2 : if (!elems.ht_capabilities) {
409 7 : wpa_printf(MSG_DEBUG, "Found overlapping legacy BSS: "
410 6 : MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
411 1 : return 1;
412 : }
413 :
414 2 : if (elems.ht_operation &&
415 1 : elems.ht_operation_len >= sizeof(*oper)) {
416 1 : oper = (struct ieee80211_ht_operation *) elems.ht_operation;
417 1 : if (oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)
418 1 : return 0;
419 :
420 0 : wpa_printf(MSG_DEBUG, "Found overlapping 20 MHz HT BSS: "
421 0 : MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
422 0 : return 1;
423 : }
424 0 : return 0;
425 : }
426 :
427 :
428 15 : static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
429 : struct wpa_scan_results *scan_res)
430 : {
431 : int pri_freq, sec_freq;
432 : int affected_start, affected_end;
433 : size_t i;
434 :
435 15 : pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
436 15 : if (iface->conf->secondary_channel > 0)
437 5 : sec_freq = pri_freq + 20;
438 : else
439 10 : sec_freq = pri_freq - 20;
440 15 : affected_start = (pri_freq + sec_freq) / 2 - 25;
441 15 : affected_end = (pri_freq + sec_freq) / 2 + 25;
442 15 : wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
443 : affected_start, affected_end);
444 16 : for (i = 0; i < scan_res->num; i++) {
445 3 : struct wpa_scan_res *bss = scan_res->res[i];
446 3 : int pri = bss->freq;
447 3 : int sec = pri;
448 : int sec_chan, pri_chan;
449 : struct ieee802_11_elems elems;
450 :
451 : /* Check for overlapping 20 MHz BSS */
452 3 : if (ieee80211n_check_20mhz_bss(bss, pri_freq, affected_start,
453 : affected_end)) {
454 1 : wpa_printf(MSG_DEBUG,
455 : "Overlapping 20 MHz BSS is found");
456 3 : return 0;
457 : }
458 :
459 2 : ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan);
460 :
461 2 : if (sec_chan) {
462 2 : if (sec_chan < pri_chan)
463 1 : sec = pri - 20;
464 : else
465 1 : sec = pri + 20;
466 : }
467 :
468 2 : if ((pri < affected_start || pri > affected_end) &&
469 0 : (sec < affected_start || sec > affected_end))
470 0 : continue; /* not within affected channel range */
471 :
472 14 : wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
473 : " freq=%d pri=%d sec=%d",
474 12 : MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
475 :
476 2 : if (sec_chan) {
477 2 : if (pri_freq != pri || sec_freq != sec) {
478 7 : wpa_printf(MSG_DEBUG, "40 MHz pri/sec "
479 : "mismatch with BSS " MACSTR
480 : " <%d,%d> (chan=%d%c) vs. <%d,%d>",
481 6 : MAC2STR(bss->bssid),
482 : pri, sec, pri_chan,
483 : sec > pri ? '+' : '-',
484 : pri_freq, sec_freq);
485 1 : return 0;
486 : }
487 : }
488 :
489 1 : ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
490 : 0);
491 2 : if (elems.ht_capabilities &&
492 1 : elems.ht_capabilities_len >=
493 : sizeof(struct ieee80211_ht_capabilities)) {
494 1 : struct ieee80211_ht_capabilities *ht_cap =
495 : (struct ieee80211_ht_capabilities *)
496 : elems.ht_capabilities;
497 :
498 1 : if (le_to_host16(ht_cap->ht_capabilities_info) &
499 : HT_CAP_INFO_40MHZ_INTOLERANT) {
500 0 : wpa_printf(MSG_DEBUG,
501 : "40 MHz Intolerant is set on channel %d in BSS "
502 0 : MACSTR, pri, MAC2STR(bss->bssid));
503 0 : return 0;
504 : }
505 : }
506 : }
507 :
508 13 : return 1;
509 : }
510 :
511 :
512 24 : static void ieee80211n_check_scan(struct hostapd_iface *iface)
513 : {
514 : struct wpa_scan_results *scan_res;
515 : int oper40;
516 : int res;
517 :
518 : /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
519 : * allowed per IEEE Std 802.11-2012, 10.15.3.2 */
520 :
521 24 : iface->scan_cb = NULL;
522 :
523 24 : scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
524 24 : if (scan_res == NULL) {
525 0 : hostapd_setup_interface_complete(iface, 1);
526 24 : return;
527 : }
528 :
529 24 : if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
530 9 : oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
531 : else
532 15 : oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
533 24 : wpa_scan_results_free(scan_res);
534 :
535 24 : iface->secondary_ch = iface->conf->secondary_channel;
536 24 : if (!oper40) {
537 6 : wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
538 : "channel pri=%d sec=%d based on overlapping BSSes",
539 2 : iface->conf->channel,
540 2 : iface->conf->channel +
541 2 : iface->conf->secondary_channel * 4);
542 2 : iface->conf->secondary_channel = 0;
543 2 : if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
544 : /*
545 : * TODO: Could consider scheduling another scan to check
546 : * if channel width can be changed if no coex reports
547 : * are received from associating stations.
548 : */
549 : }
550 : }
551 :
552 24 : res = ieee80211n_allowed_ht40_channel_pair(iface);
553 24 : if (!res) {
554 0 : iface->conf->secondary_channel = 0;
555 0 : wpa_printf(MSG_INFO, "Fallback to 20 MHz");
556 : }
557 :
558 24 : hostapd_setup_interface_complete(iface, !res);
559 : }
560 :
561 :
562 18 : static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
563 : struct wpa_driver_scan_params *params)
564 : {
565 : /* Scan only the affected frequency range */
566 : int pri_freq, sec_freq;
567 : int affected_start, affected_end;
568 : int i, pos;
569 : struct hostapd_hw_modes *mode;
570 :
571 18 : if (iface->current_mode == NULL)
572 0 : return;
573 :
574 18 : pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
575 18 : if (iface->conf->secondary_channel > 0)
576 8 : sec_freq = pri_freq + 20;
577 : else
578 10 : sec_freq = pri_freq - 20;
579 18 : affected_start = (pri_freq + sec_freq) / 2 - 25;
580 18 : affected_end = (pri_freq + sec_freq) / 2 + 25;
581 18 : wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
582 : affected_start, affected_end);
583 :
584 18 : mode = iface->current_mode;
585 18 : params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
586 18 : if (params->freqs == NULL)
587 0 : return;
588 18 : pos = 0;
589 :
590 270 : for (i = 0; i < mode->num_channels; i++) {
591 252 : struct hostapd_channel_data *chan = &mode->channels[i];
592 252 : if (chan->flag & HOSTAPD_CHAN_DISABLED)
593 36 : continue;
594 430 : if (chan->freq < affected_start ||
595 214 : chan->freq > affected_end)
596 65 : continue;
597 151 : params->freqs[pos++] = chan->freq;
598 : }
599 : }
600 :
601 :
602 9 : static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface,
603 : struct wpa_driver_scan_params *params)
604 : {
605 : /* Scan only the affected frequency range */
606 : int pri_freq;
607 : int affected_start, affected_end;
608 : int i, pos;
609 : struct hostapd_hw_modes *mode;
610 :
611 9 : if (iface->current_mode == NULL)
612 0 : return;
613 :
614 9 : pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
615 9 : if (iface->conf->secondary_channel > 0) {
616 7 : affected_start = pri_freq - 10;
617 7 : affected_end = pri_freq + 30;
618 : } else {
619 2 : affected_start = pri_freq - 30;
620 2 : affected_end = pri_freq + 10;
621 : }
622 9 : wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
623 : affected_start, affected_end);
624 :
625 9 : mode = iface->current_mode;
626 9 : params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
627 9 : if (params->freqs == NULL)
628 0 : return;
629 9 : pos = 0;
630 :
631 225 : for (i = 0; i < mode->num_channels; i++) {
632 216 : struct hostapd_channel_data *chan = &mode->channels[i];
633 216 : if (chan->flag & HOSTAPD_CHAN_DISABLED)
634 150 : continue;
635 132 : if (chan->freq < affected_start ||
636 66 : chan->freq > affected_end)
637 48 : continue;
638 18 : params->freqs[pos++] = chan->freq;
639 : }
640 : }
641 :
642 :
643 0 : static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
644 : {
645 : #define HT2040_COEX_SCAN_RETRY 15
646 0 : struct hostapd_iface *iface = eloop_data;
647 : struct wpa_driver_scan_params params;
648 : int ret;
649 :
650 0 : os_memset(¶ms, 0, sizeof(params));
651 0 : if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
652 0 : ieee80211n_scan_channels_2g4(iface, ¶ms);
653 : else
654 0 : ieee80211n_scan_channels_5g(iface, ¶ms);
655 :
656 0 : ret = hostapd_driver_scan(iface->bss[0], ¶ms);
657 0 : iface->num_ht40_scan_tries++;
658 0 : os_free(params.freqs);
659 :
660 0 : if (ret == -EBUSY &&
661 0 : iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
662 0 : wpa_printf(MSG_ERROR,
663 : "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
664 : ret, strerror(-ret), iface->num_ht40_scan_tries);
665 0 : eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
666 0 : return;
667 : }
668 :
669 0 : if (ret == 0) {
670 0 : iface->scan_cb = ieee80211n_check_scan;
671 0 : return;
672 : }
673 :
674 0 : wpa_printf(MSG_DEBUG,
675 : "Failed to request a scan in device, bringing up in HT20 mode");
676 0 : iface->conf->secondary_channel = 0;
677 0 : iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
678 0 : hostapd_setup_interface_complete(iface, 0);
679 : }
680 :
681 :
682 680 : void hostapd_stop_setup_timers(struct hostapd_iface *iface)
683 : {
684 680 : eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
685 680 : }
686 :
687 :
688 662 : static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
689 : {
690 : struct wpa_driver_scan_params params;
691 : int ret;
692 :
693 662 : if (!iface->conf->secondary_channel)
694 635 : return 0; /* HT40 not used */
695 :
696 27 : hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
697 27 : wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
698 : "40 MHz channel");
699 27 : os_memset(¶ms, 0, sizeof(params));
700 27 : if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
701 18 : ieee80211n_scan_channels_2g4(iface, ¶ms);
702 : else
703 9 : ieee80211n_scan_channels_5g(iface, ¶ms);
704 :
705 27 : ret = hostapd_driver_scan(iface->bss[0], ¶ms);
706 27 : os_free(params.freqs);
707 :
708 27 : if (ret == -EBUSY) {
709 0 : wpa_printf(MSG_ERROR,
710 : "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
711 : ret, strerror(-ret));
712 0 : iface->num_ht40_scan_tries = 1;
713 0 : eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
714 0 : eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
715 0 : return 1;
716 : }
717 :
718 27 : if (ret < 0) {
719 0 : wpa_printf(MSG_ERROR,
720 : "Failed to request a scan of neighboring BSSes ret=%d (%s)",
721 : ret, strerror(-ret));
722 0 : return -1;
723 : }
724 :
725 27 : iface->scan_cb = ieee80211n_check_scan;
726 27 : return 1;
727 : }
728 :
729 :
730 664 : static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
731 : {
732 664 : u16 hw = iface->current_mode->ht_capab;
733 664 : u16 conf = iface->conf->ht_capab;
734 :
735 665 : if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
736 1 : !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
737 1 : wpa_printf(MSG_ERROR, "Driver does not support configured "
738 : "HT capability [LDPC]");
739 1 : return 0;
740 : }
741 :
742 691 : if ((conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
743 28 : !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
744 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
745 : "HT capability [HT40*]");
746 0 : return 0;
747 : }
748 :
749 1326 : if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) &&
750 663 : (conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) {
751 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
752 : "HT capability [SMPS-*]");
753 0 : return 0;
754 : }
755 :
756 789 : if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
757 126 : !(hw & HT_CAP_INFO_GREEN_FIELD)) {
758 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
759 : "HT capability [GF]");
760 0 : return 0;
761 : }
762 :
763 663 : if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
764 0 : !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
765 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
766 : "HT capability [SHORT-GI-20]");
767 0 : return 0;
768 : }
769 :
770 791 : if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
771 128 : !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
772 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
773 : "HT capability [SHORT-GI-40]");
774 0 : return 0;
775 : }
776 :
777 663 : if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
778 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
779 : "HT capability [TX-STBC]");
780 0 : return 0;
781 : }
782 :
783 1326 : if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
784 663 : (hw & HT_CAP_INFO_RX_STBC_MASK)) {
785 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
786 : "HT capability [RX-STBC*]");
787 0 : return 0;
788 : }
789 :
790 663 : if ((conf & HT_CAP_INFO_DELAYED_BA) &&
791 0 : !(hw & HT_CAP_INFO_DELAYED_BA)) {
792 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
793 : "HT capability [DELAYED-BA]");
794 0 : return 0;
795 : }
796 :
797 663 : if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
798 0 : !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
799 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
800 : "HT capability [MAX-AMSDU-7935]");
801 0 : return 0;
802 : }
803 :
804 663 : if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
805 0 : !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
806 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
807 : "HT capability [DSSS_CCK-40]");
808 0 : return 0;
809 : }
810 :
811 663 : if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
812 0 : !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
813 0 : wpa_printf(MSG_ERROR, "Driver does not support configured "
814 : "HT capability [LSIG-TXOP-PROT]");
815 0 : return 0;
816 : }
817 :
818 663 : return 1;
819 : }
820 :
821 :
822 : #ifdef CONFIG_IEEE80211AC
823 :
824 8576 : static int ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap, const char *name)
825 : {
826 8576 : u32 req_cap = conf & cap;
827 :
828 : /*
829 : * Make sure we support all requested capabilities.
830 : * NOTE: We assume that 'cap' represents a capability mask,
831 : * not a discrete value.
832 : */
833 8576 : if ((hw & req_cap) != req_cap) {
834 0 : wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]",
835 : name);
836 0 : return 0;
837 : }
838 8576 : return 1;
839 : }
840 :
841 :
842 2681 : static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 cap,
843 : const char *name)
844 : {
845 2681 : u32 hw_max = hw & cap;
846 2681 : u32 conf_val = conf & cap;
847 :
848 2681 : if (conf_val > hw_max) {
849 1 : int offset = find_first_bit(cap);
850 1 : wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)",
851 : name, conf_val >> offset, hw_max >> offset);
852 1 : return 0;
853 : }
854 2680 : return 1;
855 : }
856 :
857 :
858 537 : static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface)
859 : {
860 537 : u32 hw = iface->current_mode->vht_capab;
861 537 : u32 conf = iface->conf->vht_capab;
862 :
863 537 : wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x",
864 : hw, conf);
865 :
866 : #define VHT_CAP_CHECK(cap) \
867 : do { \
868 : if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \
869 : return 0; \
870 : } while (0)
871 :
872 : #define VHT_CAP_CHECK_MAX(cap) \
873 : do { \
874 : if (!ieee80211ac_cap_check_max(hw, conf, cap, #cap)) \
875 : return 0; \
876 : } while (0)
877 :
878 537 : VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK);
879 536 : VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ);
880 536 : VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ);
881 536 : VHT_CAP_CHECK(VHT_CAP_RXLDPC);
882 536 : VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80);
883 536 : VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160);
884 536 : VHT_CAP_CHECK(VHT_CAP_TXSTBC);
885 536 : VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK);
886 536 : VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE);
887 536 : VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE);
888 536 : VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX);
889 536 : VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX);
890 536 : VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE);
891 536 : VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE);
892 536 : VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS);
893 536 : VHT_CAP_CHECK(VHT_CAP_HTC_VHT);
894 536 : VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX);
895 536 : VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB);
896 536 : VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB);
897 536 : VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN);
898 536 : VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN);
899 :
900 : #undef VHT_CAP_CHECK
901 : #undef VHT_CAP_CHECK_MAX
902 :
903 536 : return 1;
904 : }
905 : #endif /* CONFIG_IEEE80211AC */
906 :
907 : #endif /* CONFIG_IEEE80211N */
908 :
909 :
910 669 : int hostapd_check_ht_capab(struct hostapd_iface *iface)
911 : {
912 : #ifdef CONFIG_IEEE80211N
913 : int ret;
914 669 : if (!iface->conf->ieee80211n)
915 5 : return 0;
916 664 : if (!ieee80211n_supported_ht_capab(iface))
917 1 : return -1;
918 : #ifdef CONFIG_IEEE80211AC
919 537 : if (!ieee80211ac_supported_vht_capab(iface))
920 1 : return -1;
921 : #endif /* CONFIG_IEEE80211AC */
922 662 : ret = ieee80211n_check_40mhz(iface);
923 662 : if (ret)
924 27 : return ret;
925 635 : if (!ieee80211n_allowed_ht40_channel_pair(iface))
926 0 : return -1;
927 : #endif /* CONFIG_IEEE80211N */
928 :
929 635 : return 0;
930 : }
931 :
932 :
933 700 : static int hostapd_is_usable_chan(struct hostapd_iface *iface,
934 : int channel, int primary)
935 : {
936 : int i;
937 : struct hostapd_channel_data *chan;
938 :
939 1604 : for (i = 0; i < iface->current_mode->num_channels; i++) {
940 1602 : chan = &iface->current_mode->channels[i];
941 1602 : if (chan->chan != channel)
942 904 : continue;
943 :
944 698 : if (!(chan->flag & HOSTAPD_CHAN_DISABLED))
945 698 : return 1;
946 :
947 0 : wpa_printf(MSG_DEBUG,
948 : "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s%s",
949 : primary ? "" : "Configured HT40 secondary ",
950 0 : i, chan->chan, chan->flag,
951 0 : chan->flag & HOSTAPD_CHAN_NO_IBSS ? " NO-IBSS" : "",
952 0 : chan->flag & HOSTAPD_CHAN_PASSIVE_SCAN ?
953 : " PASSIVE-SCAN" : "",
954 0 : chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : "");
955 : }
956 :
957 2 : return 0;
958 : }
959 :
960 :
961 671 : static int hostapd_is_usable_chans(struct hostapd_iface *iface)
962 : {
963 671 : if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))
964 2 : return 0;
965 :
966 669 : if (!iface->conf->secondary_channel)
967 640 : return 1;
968 :
969 58 : return hostapd_is_usable_chan(iface, iface->conf->channel +
970 29 : iface->conf->secondary_channel * 4, 0);
971 : }
972 :
973 :
974 : static enum hostapd_chan_status
975 680 : hostapd_check_chans(struct hostapd_iface *iface)
976 : {
977 680 : if (iface->conf->channel) {
978 671 : if (hostapd_is_usable_chans(iface))
979 669 : return HOSTAPD_CHAN_VALID;
980 : else
981 2 : return HOSTAPD_CHAN_INVALID;
982 : }
983 :
984 : /*
985 : * The user set channel=0 or channel=acs_survey
986 : * which is used to trigger ACS.
987 : */
988 :
989 9 : switch (acs_init(iface)) {
990 : case HOSTAPD_CHAN_ACS:
991 9 : return HOSTAPD_CHAN_ACS;
992 : case HOSTAPD_CHAN_VALID:
993 : case HOSTAPD_CHAN_INVALID:
994 : default:
995 0 : return HOSTAPD_CHAN_INVALID;
996 : }
997 : }
998 :
999 :
1000 2 : static void hostapd_notify_bad_chans(struct hostapd_iface *iface)
1001 : {
1002 4 : hostapd_logger(iface->bss[0], NULL,
1003 : HOSTAPD_MODULE_IEEE80211,
1004 : HOSTAPD_LEVEL_WARNING,
1005 : "Configured channel (%d) not found from the "
1006 : "channel list of current mode (%d) %s",
1007 2 : iface->conf->channel,
1008 2 : iface->current_mode->mode,
1009 2 : hostapd_hw_mode_txt(iface->current_mode->mode));
1010 2 : hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
1011 : HOSTAPD_LEVEL_WARNING,
1012 : "Hardware does not support configured channel");
1013 2 : }
1014 :
1015 :
1016 7 : int hostapd_acs_completed(struct hostapd_iface *iface, int err)
1017 : {
1018 7 : int ret = -1;
1019 :
1020 7 : if (err)
1021 3 : goto out;
1022 :
1023 4 : switch (hostapd_check_chans(iface)) {
1024 : case HOSTAPD_CHAN_VALID:
1025 12 : wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO,
1026 : ACS_EVENT_COMPLETED "freq=%d channel=%d",
1027 4 : hostapd_hw_get_freq(iface->bss[0],
1028 4 : iface->conf->channel),
1029 4 : iface->conf->channel);
1030 4 : break;
1031 : case HOSTAPD_CHAN_ACS:
1032 0 : wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
1033 0 : wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
1034 0 : hostapd_notify_bad_chans(iface);
1035 0 : goto out;
1036 : case HOSTAPD_CHAN_INVALID:
1037 : default:
1038 0 : wpa_printf(MSG_ERROR, "ACS picked unusable channels");
1039 0 : wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
1040 0 : hostapd_notify_bad_chans(iface);
1041 0 : goto out;
1042 : }
1043 :
1044 4 : ret = hostapd_check_ht_capab(iface);
1045 4 : if (ret < 0)
1046 0 : goto out;
1047 4 : if (ret == 1) {
1048 1 : wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
1049 1 : return 0;
1050 : }
1051 :
1052 3 : ret = 0;
1053 : out:
1054 6 : return hostapd_setup_interface_complete(iface, ret);
1055 : }
1056 :
1057 :
1058 : /**
1059 : * hostapd_select_hw_mode - Select the hardware mode
1060 : * @iface: Pointer to interface data.
1061 : * Returns: 0 on success, < 0 on failure
1062 : *
1063 : * Sets up the hardware mode, channel, rates, and passive scanning
1064 : * based on the configuration.
1065 : */
1066 676 : int hostapd_select_hw_mode(struct hostapd_iface *iface)
1067 : {
1068 : int i;
1069 :
1070 676 : if (iface->num_hw_features < 1)
1071 0 : return -1;
1072 :
1073 703 : if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G ||
1074 703 : iface->conf->ieee80211n || iface->conf->ieee80211ac) &&
1075 675 : iface->conf->channel == 14) {
1076 2 : wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14");
1077 2 : iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B;
1078 2 : iface->conf->ieee80211n = 0;
1079 2 : iface->conf->ieee80211ac = 0;
1080 : }
1081 :
1082 676 : iface->current_mode = NULL;
1083 706 : for (i = 0; i < iface->num_hw_features; i++) {
1084 706 : struct hostapd_hw_modes *mode = &iface->hw_features[i];
1085 706 : if (mode->mode == iface->conf->hw_mode) {
1086 676 : iface->current_mode = mode;
1087 676 : break;
1088 : }
1089 : }
1090 :
1091 676 : if (iface->current_mode == NULL) {
1092 0 : wpa_printf(MSG_ERROR, "Hardware does not support configured "
1093 : "mode");
1094 0 : hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
1095 : HOSTAPD_LEVEL_WARNING,
1096 : "Hardware does not support configured mode "
1097 : "(%d) (hw_mode in hostapd.conf)",
1098 0 : (int) iface->conf->hw_mode);
1099 0 : return -2;
1100 : }
1101 :
1102 676 : switch (hostapd_check_chans(iface)) {
1103 : case HOSTAPD_CHAN_VALID:
1104 665 : return 0;
1105 : case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */
1106 9 : return 1;
1107 : case HOSTAPD_CHAN_INVALID:
1108 : default:
1109 2 : hostapd_notify_bad_chans(iface);
1110 2 : return -3;
1111 : }
1112 : }
1113 :
1114 :
1115 666 : const char * hostapd_hw_mode_txt(int mode)
1116 : {
1117 666 : switch (mode) {
1118 : case HOSTAPD_MODE_IEEE80211A:
1119 20 : return "IEEE 802.11a";
1120 : case HOSTAPD_MODE_IEEE80211B:
1121 3 : return "IEEE 802.11b";
1122 : case HOSTAPD_MODE_IEEE80211G:
1123 643 : return "IEEE 802.11g";
1124 : case HOSTAPD_MODE_IEEE80211AD:
1125 0 : return "IEEE 802.11ad";
1126 : default:
1127 0 : return "UNKNOWN";
1128 : }
1129 : }
1130 :
1131 :
1132 721 : int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
1133 : {
1134 : int i;
1135 :
1136 721 : if (!hapd->iface->current_mode)
1137 0 : return 0;
1138 :
1139 1655 : for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
1140 1655 : struct hostapd_channel_data *ch =
1141 1655 : &hapd->iface->current_mode->channels[i];
1142 1655 : if (ch->chan == chan)
1143 721 : return ch->freq;
1144 : }
1145 :
1146 0 : return 0;
1147 : }
1148 :
1149 :
1150 2 : int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
1151 : {
1152 : int i;
1153 :
1154 2 : if (!hapd->iface->current_mode)
1155 0 : return 0;
1156 :
1157 8 : for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
1158 8 : struct hostapd_channel_data *ch =
1159 8 : &hapd->iface->current_mode->channels[i];
1160 8 : if (ch->freq == freq)
1161 2 : return ch->chan;
1162 : }
1163 :
1164 0 : return 0;
1165 : }
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