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 "common/hw_features_common.h"
19 #include "hostapd.h"
20 #include "ap_config.h"
21 #include "ap_drv_ops.h"
22 #include "acs.h"
23 #include "ieee802_11.h"
24 #include "beacon.h"
25 #include "hw_features.h"
26
27
hostapd_free_hw_features(struct hostapd_hw_modes * hw_features,size_t num_hw_features)28 void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
29 size_t num_hw_features)
30 {
31 size_t i;
32
33 if (hw_features == NULL)
34 return;
35
36 for (i = 0; i < num_hw_features; i++) {
37 os_free(hw_features[i].channels);
38 os_free(hw_features[i].rates);
39 }
40
41 os_free(hw_features);
42 }
43
44
45 #ifndef CONFIG_NO_STDOUT_DEBUG
dfs_info(struct hostapd_channel_data * chan)46 static char * dfs_info(struct hostapd_channel_data *chan)
47 {
48 static char info[256];
49 char *state;
50
51 switch (chan->flag & HOSTAPD_CHAN_DFS_MASK) {
52 case HOSTAPD_CHAN_DFS_UNKNOWN:
53 state = "unknown";
54 break;
55 case HOSTAPD_CHAN_DFS_USABLE:
56 state = "usable";
57 break;
58 case HOSTAPD_CHAN_DFS_UNAVAILABLE:
59 state = "unavailable";
60 break;
61 case HOSTAPD_CHAN_DFS_AVAILABLE:
62 state = "available";
63 break;
64 default:
65 return "";
66 }
67 os_snprintf(info, sizeof(info), " (DFS state = %s)", state);
68 info[sizeof(info) - 1] = '\0';
69
70 return info;
71 }
72 #endif /* CONFIG_NO_STDOUT_DEBUG */
73
74
hostapd_get_hw_features(struct hostapd_iface * iface)75 int hostapd_get_hw_features(struct hostapd_iface *iface)
76 {
77 struct hostapd_data *hapd = iface->bss[0];
78 int i, j;
79 u16 num_modes, flags;
80 struct hostapd_hw_modes *modes;
81 u8 dfs_domain;
82
83 if (hostapd_drv_none(hapd))
84 return -1;
85 modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags,
86 &dfs_domain);
87 if (modes == NULL) {
88 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
89 HOSTAPD_LEVEL_DEBUG,
90 "Fetching hardware channel/rate support not "
91 "supported.");
92 return -1;
93 }
94
95 iface->hw_flags = flags;
96 iface->dfs_domain = dfs_domain;
97
98 hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
99 iface->hw_features = modes;
100 iface->num_hw_features = num_modes;
101
102 for (i = 0; i < num_modes; i++) {
103 struct hostapd_hw_modes *feature = &modes[i];
104 int dfs_enabled = hapd->iconf->ieee80211h &&
105 (iface->drv_flags & WPA_DRIVER_FLAGS_RADAR);
106
107 /* set flag for channels we can use in current regulatory
108 * domain */
109 for (j = 0; j < feature->num_channels; j++) {
110 int dfs = 0;
111
112 /*
113 * Disable all channels that are marked not to allow
114 * to initiate radiation (a.k.a. passive scan and no
115 * IBSS).
116 * Use radar channels only if the driver supports DFS.
117 */
118 if ((feature->channels[j].flag &
119 HOSTAPD_CHAN_RADAR) && dfs_enabled) {
120 dfs = 1;
121 } else if (((feature->channels[j].flag &
122 HOSTAPD_CHAN_RADAR) &&
123 !(iface->drv_flags &
124 WPA_DRIVER_FLAGS_DFS_OFFLOAD)) ||
125 (feature->channels[j].flag &
126 HOSTAPD_CHAN_NO_IR)) {
127 feature->channels[j].flag |=
128 HOSTAPD_CHAN_DISABLED;
129 }
130
131 if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
132 continue;
133
134 wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
135 "chan=%d freq=%d MHz max_tx_power=%d dBm%s",
136 feature->mode,
137 feature->channels[j].chan,
138 feature->channels[j].freq,
139 feature->channels[j].max_tx_power,
140 dfs ? dfs_info(&feature->channels[j]) : "");
141 }
142 }
143
144 return 0;
145 }
146
147
hostapd_prepare_rates(struct hostapd_iface * iface,struct hostapd_hw_modes * mode)148 int hostapd_prepare_rates(struct hostapd_iface *iface,
149 struct hostapd_hw_modes *mode)
150 {
151 int i, num_basic_rates = 0;
152 int basic_rates_a[] = { 60, 120, 240, -1 };
153 int basic_rates_b[] = { 10, 20, -1 };
154 int basic_rates_g[] = { 10, 20, 55, 110, -1 };
155 int *basic_rates;
156
157 if (iface->conf->basic_rates)
158 basic_rates = iface->conf->basic_rates;
159 else switch (mode->mode) {
160 case HOSTAPD_MODE_IEEE80211A:
161 basic_rates = basic_rates_a;
162 break;
163 case HOSTAPD_MODE_IEEE80211B:
164 basic_rates = basic_rates_b;
165 break;
166 case HOSTAPD_MODE_IEEE80211G:
167 basic_rates = basic_rates_g;
168 break;
169 case HOSTAPD_MODE_IEEE80211AD:
170 return 0; /* No basic rates for 11ad */
171 default:
172 return -1;
173 }
174
175 i = 0;
176 while (basic_rates[i] >= 0)
177 i++;
178 if (i)
179 i++; /* -1 termination */
180 os_free(iface->basic_rates);
181 iface->basic_rates = os_malloc(i * sizeof(int));
182 if (iface->basic_rates)
183 os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int));
184
185 os_free(iface->current_rates);
186 iface->num_rates = 0;
187
188 iface->current_rates =
189 os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data));
190 if (!iface->current_rates) {
191 wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
192 "table.");
193 return -1;
194 }
195
196 for (i = 0; i < mode->num_rates; i++) {
197 struct hostapd_rate_data *rate;
198
199 if (iface->conf->supported_rates &&
200 !hostapd_rate_found(iface->conf->supported_rates,
201 mode->rates[i]))
202 continue;
203
204 rate = &iface->current_rates[iface->num_rates];
205 rate->rate = mode->rates[i];
206 if (hostapd_rate_found(basic_rates, rate->rate)) {
207 rate->flags |= HOSTAPD_RATE_BASIC;
208 num_basic_rates++;
209 }
210 wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
211 iface->num_rates, rate->rate, rate->flags);
212 iface->num_rates++;
213 }
214
215 if ((iface->num_rates == 0 || num_basic_rates == 0) &&
216 (!iface->conf->ieee80211n || !iface->conf->require_ht)) {
217 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
218 "rate sets (%d,%d).",
219 iface->num_rates, num_basic_rates);
220 return -1;
221 }
222
223 return 0;
224 }
225
226
ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface * iface)227 static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
228 {
229 int pri_freq, sec_freq;
230 struct hostapd_channel_data *p_chan, *s_chan;
231
232 pri_freq = iface->freq;
233 sec_freq = pri_freq + iface->conf->secondary_channel * 20;
234
235 if (!iface->current_mode)
236 return 0;
237
238 p_chan = hw_get_channel_freq(iface->current_mode->mode, pri_freq, NULL,
239 iface->hw_features,
240 iface->num_hw_features);
241
242 s_chan = hw_get_channel_freq(iface->current_mode->mode, sec_freq, NULL,
243 iface->hw_features,
244 iface->num_hw_features);
245
246 return allowed_ht40_channel_pair(iface->current_mode->mode,
247 p_chan, s_chan);
248 }
249
250
ieee80211n_switch_pri_sec(struct hostapd_iface * iface)251 static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
252 {
253 if (iface->conf->secondary_channel > 0) {
254 iface->conf->channel += 4;
255 iface->freq += 20;
256 iface->conf->secondary_channel = -1;
257 } else {
258 iface->conf->channel -= 4;
259 iface->freq -= 20;
260 iface->conf->secondary_channel = 1;
261 }
262 }
263
264
ieee80211n_check_40mhz_5g(struct hostapd_iface * iface,struct wpa_scan_results * scan_res)265 static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
266 struct wpa_scan_results *scan_res)
267 {
268 unsigned int pri_freq, sec_freq;
269 int res;
270 struct hostapd_channel_data *pri_chan, *sec_chan;
271
272 pri_freq = iface->freq;
273 sec_freq = pri_freq + iface->conf->secondary_channel * 20;
274
275 if (!iface->current_mode)
276 return 0;
277 pri_chan = hw_get_channel_freq(iface->current_mode->mode, pri_freq,
278 NULL, iface->hw_features,
279 iface->num_hw_features);
280 sec_chan = hw_get_channel_freq(iface->current_mode->mode, sec_freq,
281 NULL, iface->hw_features,
282 iface->num_hw_features);
283
284 res = check_40mhz_5g(scan_res, pri_chan, sec_chan);
285
286 if (res == 2) {
287 if (iface->conf->no_pri_sec_switch) {
288 wpa_printf(MSG_DEBUG,
289 "Cannot switch PRI/SEC channels due to local constraint");
290 } else {
291 ieee80211n_switch_pri_sec(iface);
292 }
293 }
294
295 return !!res;
296 }
297
298
ieee80211n_check_40mhz_2g4(struct hostapd_iface * iface,struct wpa_scan_results * scan_res)299 static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
300 struct wpa_scan_results *scan_res)
301 {
302 int pri_chan, sec_chan;
303
304 pri_chan = iface->conf->channel;
305 sec_chan = pri_chan + iface->conf->secondary_channel * 4;
306
307 return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan,
308 sec_chan);
309 }
310
311
ieee80211n_check_scan(struct hostapd_iface * iface)312 static void ieee80211n_check_scan(struct hostapd_iface *iface)
313 {
314 struct wpa_scan_results *scan_res;
315 int oper40;
316 int res = 0;
317
318 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
319 * allowed per IEEE Std 802.11-2012, 10.15.3.2 */
320
321 iface->scan_cb = NULL;
322
323 scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
324 if (scan_res == NULL) {
325 hostapd_setup_interface_complete(iface, 1);
326 return;
327 }
328
329 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
330 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
331 else
332 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
333 wpa_scan_results_free(scan_res);
334
335 iface->secondary_ch = iface->conf->secondary_channel;
336 if (!oper40) {
337 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
338 "channel pri=%d sec=%d based on overlapping BSSes",
339 iface->conf->channel,
340 iface->conf->channel +
341 iface->conf->secondary_channel * 4);
342 iface->conf->secondary_channel = 0;
343 if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
344 /*
345 * TODO: Could consider scheduling another scan to check
346 * if channel width can be changed if no coex reports
347 * are received from associating stations.
348 */
349 }
350 }
351
352 #ifdef CONFIG_IEEE80211AX
353 if (iface->conf->secondary_channel &&
354 iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G &&
355 iface->conf->ieee80211ax) {
356 struct he_capabilities *he_cap;
357
358 he_cap = &iface->current_mode->he_capab[IEEE80211_MODE_AP];
359 if (!(he_cap->phy_cap[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
360 HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_IN_2G)) {
361 wpa_printf(MSG_DEBUG,
362 "HE: 40 MHz channel width is not supported in 2.4 GHz; clear secondary channel configuration");
363 iface->conf->secondary_channel = 0;
364 }
365 }
366 #endif /* CONFIG_IEEE80211AX */
367
368 if (iface->conf->secondary_channel)
369 res = ieee80211n_allowed_ht40_channel_pair(iface);
370 if (!res) {
371 iface->conf->secondary_channel = 0;
372 hostapd_set_oper_centr_freq_seg0_idx(iface->conf, 0);
373 hostapd_set_oper_centr_freq_seg1_idx(iface->conf, 0);
374 hostapd_set_oper_chwidth(iface->conf, CONF_OPER_CHWIDTH_USE_HT);
375 res = 1;
376 wpa_printf(MSG_INFO, "Fallback to 20 MHz");
377 }
378
379 hostapd_setup_interface_complete(iface, !res);
380 }
381
382
ieee80211n_scan_channels_2g4(struct hostapd_iface * iface,struct wpa_driver_scan_params * params)383 static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
384 struct wpa_driver_scan_params *params)
385 {
386 /* Scan only the affected frequency range */
387 int pri_freq, sec_freq;
388 int affected_start, affected_end;
389 int i, pos;
390 struct hostapd_hw_modes *mode;
391
392 if (iface->current_mode == NULL)
393 return;
394
395 pri_freq = iface->freq;
396 if (iface->conf->secondary_channel > 0)
397 sec_freq = pri_freq + 20;
398 else
399 sec_freq = pri_freq - 20;
400 /*
401 * Note: Need to find the PRI channel also in cases where the affected
402 * channel is the SEC channel of a 40 MHz BSS, so need to include the
403 * scanning coverage here to be 40 MHz from the center frequency.
404 */
405 affected_start = (pri_freq + sec_freq) / 2 - 40;
406 affected_end = (pri_freq + sec_freq) / 2 + 40;
407 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
408 affected_start, affected_end);
409
410 mode = iface->current_mode;
411 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
412 if (params->freqs == NULL)
413 return;
414 pos = 0;
415
416 for (i = 0; i < mode->num_channels; i++) {
417 struct hostapd_channel_data *chan = &mode->channels[i];
418 if (chan->flag & HOSTAPD_CHAN_DISABLED)
419 continue;
420 if (chan->freq < affected_start ||
421 chan->freq > affected_end)
422 continue;
423 params->freqs[pos++] = chan->freq;
424 }
425 }
426
427
ieee80211n_scan_channels_5g(struct hostapd_iface * iface,struct wpa_driver_scan_params * params)428 static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface,
429 struct wpa_driver_scan_params *params)
430 {
431 /* Scan only the affected frequency range */
432 int pri_freq;
433 int affected_start, affected_end;
434 int i, pos;
435 struct hostapd_hw_modes *mode;
436
437 if (iface->current_mode == NULL)
438 return;
439
440 pri_freq = iface->freq;
441 if (iface->conf->secondary_channel > 0) {
442 affected_start = pri_freq - 10;
443 affected_end = pri_freq + 30;
444 } else {
445 affected_start = pri_freq - 30;
446 affected_end = pri_freq + 10;
447 }
448 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
449 affected_start, affected_end);
450
451 mode = iface->current_mode;
452 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
453 if (params->freqs == NULL)
454 return;
455 pos = 0;
456
457 for (i = 0; i < mode->num_channels; i++) {
458 struct hostapd_channel_data *chan = &mode->channels[i];
459 if (chan->flag & HOSTAPD_CHAN_DISABLED)
460 continue;
461 if (chan->freq < affected_start ||
462 chan->freq > affected_end)
463 continue;
464 params->freqs[pos++] = chan->freq;
465 }
466 }
467
468
ap_ht40_scan_retry(void * eloop_data,void * user_data)469 static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
470 {
471 #define HT2040_COEX_SCAN_RETRY 15
472 struct hostapd_iface *iface = eloop_data;
473 struct wpa_driver_scan_params params;
474 int ret;
475
476 os_memset(¶ms, 0, sizeof(params));
477 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
478 ieee80211n_scan_channels_2g4(iface, ¶ms);
479 else
480 ieee80211n_scan_channels_5g(iface, ¶ms);
481
482 ret = hostapd_driver_scan(iface->bss[0], ¶ms);
483 iface->num_ht40_scan_tries++;
484 os_free(params.freqs);
485
486 if (ret == -EBUSY &&
487 iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
488 wpa_printf(MSG_ERROR,
489 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
490 ret, strerror(-ret), iface->num_ht40_scan_tries);
491 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
492 return;
493 }
494
495 if (ret == 0) {
496 iface->scan_cb = ieee80211n_check_scan;
497 return;
498 }
499
500 wpa_printf(MSG_DEBUG,
501 "Failed to request a scan in device, bringing up in HT20 mode");
502 iface->conf->secondary_channel = 0;
503 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
504 hostapd_setup_interface_complete(iface, 0);
505 }
506
507
hostapd_stop_setup_timers(struct hostapd_iface * iface)508 void hostapd_stop_setup_timers(struct hostapd_iface *iface)
509 {
510 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
511 }
512
513
ieee80211n_check_40mhz(struct hostapd_iface * iface)514 static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
515 {
516 struct wpa_driver_scan_params params;
517 int ret;
518
519 /* Check that HT40 is used and PRI / SEC switch is allowed */
520 if (!iface->conf->secondary_channel || iface->conf->no_pri_sec_switch)
521 return 0;
522
523 hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
524 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
525 "40 MHz channel");
526 os_memset(¶ms, 0, sizeof(params));
527 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
528 ieee80211n_scan_channels_2g4(iface, ¶ms);
529 else
530 ieee80211n_scan_channels_5g(iface, ¶ms);
531
532 ret = hostapd_driver_scan(iface->bss[0], ¶ms);
533 os_free(params.freqs);
534
535 if (ret == -EBUSY) {
536 wpa_printf(MSG_ERROR,
537 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
538 ret, strerror(-ret));
539 iface->num_ht40_scan_tries = 1;
540 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
541 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
542 return 1;
543 }
544
545 if (ret < 0) {
546 wpa_printf(MSG_ERROR,
547 "Failed to request a scan of neighboring BSSes ret=%d (%s)",
548 ret, strerror(-ret));
549 return -1;
550 }
551
552 iface->scan_cb = ieee80211n_check_scan;
553 return 1;
554 }
555
556
ieee80211n_supported_ht_capab(struct hostapd_iface * iface)557 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
558 {
559 u16 hw = iface->current_mode->ht_capab;
560 u16 conf = iface->conf->ht_capab;
561
562 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
563 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
564 wpa_printf(MSG_ERROR, "Driver does not support configured "
565 "HT capability [LDPC]");
566 return 0;
567 }
568
569 /*
570 * Driver ACS chosen channel may not be HT40 due to internal driver
571 * restrictions.
572 */
573 if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
574 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
575 wpa_printf(MSG_ERROR, "Driver does not support configured "
576 "HT capability [HT40*]");
577 return 0;
578 }
579
580 if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
581 !(hw & HT_CAP_INFO_GREEN_FIELD)) {
582 wpa_printf(MSG_ERROR, "Driver does not support configured "
583 "HT capability [GF]");
584 return 0;
585 }
586
587 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
588 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
589 wpa_printf(MSG_ERROR, "Driver does not support configured "
590 "HT capability [SHORT-GI-20]");
591 return 0;
592 }
593
594 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
595 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
596 wpa_printf(MSG_ERROR, "Driver does not support configured "
597 "HT capability [SHORT-GI-40]");
598 return 0;
599 }
600
601 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
602 wpa_printf(MSG_ERROR, "Driver does not support configured "
603 "HT capability [TX-STBC]");
604 return 0;
605 }
606
607 if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
608 (hw & HT_CAP_INFO_RX_STBC_MASK)) {
609 wpa_printf(MSG_ERROR, "Driver does not support configured "
610 "HT capability [RX-STBC*]");
611 return 0;
612 }
613
614 if ((conf & HT_CAP_INFO_DELAYED_BA) &&
615 !(hw & HT_CAP_INFO_DELAYED_BA)) {
616 wpa_printf(MSG_ERROR, "Driver does not support configured "
617 "HT capability [DELAYED-BA]");
618 return 0;
619 }
620
621 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
622 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
623 wpa_printf(MSG_ERROR, "Driver does not support configured "
624 "HT capability [MAX-AMSDU-7935]");
625 return 0;
626 }
627
628 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
629 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
630 wpa_printf(MSG_ERROR, "Driver does not support configured "
631 "HT capability [DSSS_CCK-40]");
632 return 0;
633 }
634
635 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
636 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
637 wpa_printf(MSG_ERROR, "Driver does not support configured "
638 "HT capability [LSIG-TXOP-PROT]");
639 return 0;
640 }
641
642 return 1;
643 }
644
645
646 #ifdef CONFIG_IEEE80211AC
ieee80211ac_supported_vht_capab(struct hostapd_iface * iface)647 static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface)
648 {
649 struct hostapd_hw_modes *mode = iface->current_mode;
650 u32 hw = mode->vht_capab;
651 u32 conf = iface->conf->vht_capab;
652
653 wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x",
654 hw, conf);
655
656 if (mode->mode == HOSTAPD_MODE_IEEE80211G &&
657 iface->conf->bss[0]->vendor_vht &&
658 mode->vht_capab == 0 && iface->hw_features) {
659 int i;
660
661 for (i = 0; i < iface->num_hw_features; i++) {
662 if (iface->hw_features[i].mode ==
663 HOSTAPD_MODE_IEEE80211A) {
664 mode = &iface->hw_features[i];
665 hw = mode->vht_capab;
666 wpa_printf(MSG_DEBUG,
667 "update hw vht capab based on 5 GHz band: 0x%x",
668 hw);
669 break;
670 }
671 }
672 }
673
674 return ieee80211ac_cap_check(hw, conf);
675 }
676 #endif /* CONFIG_IEEE80211AC */
677
678
679 #ifdef CONFIG_IEEE80211AX
ieee80211ax_supported_he_capab(struct hostapd_iface * iface)680 static int ieee80211ax_supported_he_capab(struct hostapd_iface *iface)
681 {
682 return 1;
683 }
684 #endif /* CONFIG_IEEE80211AX */
685
686
hostapd_check_ht_capab(struct hostapd_iface * iface)687 int hostapd_check_ht_capab(struct hostapd_iface *iface)
688 {
689 int ret;
690
691 if (is_6ghz_freq(iface->freq))
692 return 0;
693 if (!iface->conf->ieee80211n)
694 return 0;
695
696 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B &&
697 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G &&
698 (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) {
699 wpa_printf(MSG_DEBUG,
700 "Disable HT capability [DSSS_CCK-40] on 5 GHz band");
701 iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ;
702 }
703
704 if (!ieee80211n_supported_ht_capab(iface))
705 return -1;
706 #ifdef CONFIG_IEEE80211AX
707 if (iface->conf->ieee80211ax &&
708 !ieee80211ax_supported_he_capab(iface))
709 return -1;
710 #endif /* CONFIG_IEEE80211AX */
711 #ifdef CONFIG_IEEE80211AC
712 if (iface->conf->ieee80211ac &&
713 !ieee80211ac_supported_vht_capab(iface))
714 return -1;
715 #endif /* CONFIG_IEEE80211AC */
716 ret = ieee80211n_check_40mhz(iface);
717 if (ret)
718 return ret;
719 if (!ieee80211n_allowed_ht40_channel_pair(iface))
720 return -1;
721
722 return 0;
723 }
724
725
hostapd_check_edmg_capab(struct hostapd_iface * iface)726 int hostapd_check_edmg_capab(struct hostapd_iface *iface)
727 {
728 struct hostapd_hw_modes *mode = iface->hw_features;
729 struct ieee80211_edmg_config edmg;
730
731 if (!iface->conf->enable_edmg)
732 return 0;
733
734 hostapd_encode_edmg_chan(iface->conf->enable_edmg,
735 iface->conf->edmg_channel,
736 iface->conf->channel,
737 &edmg);
738
739 if (mode->edmg.channels && ieee802_edmg_is_allowed(mode->edmg, edmg))
740 return 0;
741
742 wpa_printf(MSG_WARNING, "Requested EDMG configuration is not valid");
743 wpa_printf(MSG_INFO, "EDMG capab: channels 0x%x, bw_config %d",
744 mode->edmg.channels, mode->edmg.bw_config);
745 wpa_printf(MSG_INFO,
746 "Requested EDMG configuration: channels 0x%x, bw_config %d",
747 edmg.channels, edmg.bw_config);
748 return -1;
749 }
750
751
hostapd_check_he_6ghz_capab(struct hostapd_iface * iface)752 int hostapd_check_he_6ghz_capab(struct hostapd_iface *iface)
753 {
754 #ifdef CONFIG_IEEE80211AX
755 struct he_capabilities *he_cap;
756 u16 hw;
757
758 if (!iface->current_mode || !is_6ghz_freq(iface->freq))
759 return 0;
760
761 he_cap = &iface->current_mode->he_capab[IEEE80211_MODE_AP];
762 hw = he_cap->he_6ghz_capa;
763 if (iface->conf->he_6ghz_max_mpdu >
764 ((hw & HE_6GHZ_BAND_CAP_MAX_MPDU_LEN_MASK) >>
765 HE_6GHZ_BAND_CAP_MAX_MPDU_LEN_SHIFT)) {
766 wpa_printf(MSG_ERROR,
767 "The driver does not support the configured HE 6 GHz Max MPDU length");
768 return -1;
769 }
770
771 if (iface->conf->he_6ghz_max_ampdu_len_exp >
772 ((hw & HE_6GHZ_BAND_CAP_MAX_AMPDU_LEN_EXP_MASK) >>
773 HE_6GHZ_BAND_CAP_MAX_AMPDU_LEN_EXP_SHIFT)) {
774 wpa_printf(MSG_ERROR,
775 "The driver does not support the configured HE 6 GHz Max AMPDU Length Exponent");
776 return -1;
777 }
778
779 if (iface->conf->he_6ghz_rx_ant_pat &&
780 !(hw & HE_6GHZ_BAND_CAP_RX_ANTPAT_CONS)) {
781 wpa_printf(MSG_ERROR,
782 "The driver does not support the configured HE 6 GHz Rx Antenna Pattern");
783 return -1;
784 }
785
786 if (iface->conf->he_6ghz_tx_ant_pat &&
787 !(hw & HE_6GHZ_BAND_CAP_TX_ANTPAT_CONS)) {
788 wpa_printf(MSG_ERROR,
789 "The driver does not support the configured HE 6 GHz Tx Antenna Pattern");
790 return -1;
791 }
792 #endif /* CONFIG_IEEE80211AX */
793 return 0;
794 }
795
796
hostapd_is_usable_chan(struct hostapd_iface * iface,int frequency,int primary)797 static int hostapd_is_usable_chan(struct hostapd_iface *iface,
798 int frequency, int primary)
799 {
800 struct hostapd_channel_data *chan;
801
802 if (!iface->current_mode)
803 return 0;
804
805 chan = hw_get_channel_freq(iface->current_mode->mode, frequency, NULL,
806 iface->hw_features, iface->num_hw_features);
807 if (!chan)
808 return 0;
809
810 if ((primary && chan_pri_allowed(chan)) ||
811 (!primary && !(chan->flag & HOSTAPD_CHAN_DISABLED)))
812 return 1;
813
814 wpa_printf(MSG_INFO,
815 "Frequency %d (%s) not allowed for AP mode, flags: 0x%x%s%s",
816 frequency, primary ? "primary" : "secondary",
817 chan->flag,
818 chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "",
819 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : "");
820 return 0;
821 }
822
823
hostapd_is_usable_edmg(struct hostapd_iface * iface)824 static int hostapd_is_usable_edmg(struct hostapd_iface *iface)
825 {
826 int i, contiguous = 0;
827 int num_of_enabled = 0;
828 int max_contiguous = 0;
829 struct ieee80211_edmg_config edmg;
830 struct hostapd_channel_data *pri_chan;
831
832 if (!iface->conf->enable_edmg)
833 return 1;
834
835 if (!iface->current_mode)
836 return 0;
837 pri_chan = hw_get_channel_freq(iface->current_mode->mode,
838 iface->freq, NULL,
839 iface->hw_features,
840 iface->num_hw_features);
841 if (!pri_chan)
842 return 0;
843 hostapd_encode_edmg_chan(iface->conf->enable_edmg,
844 iface->conf->edmg_channel,
845 pri_chan->chan,
846 &edmg);
847 if (!(edmg.channels & BIT(pri_chan->chan - 1)))
848 return 0;
849
850 /* 60 GHz channels 1..6 */
851 for (i = 0; i < 6; i++) {
852 int freq = 56160 + 2160 * (i + 1);
853
854 if (edmg.channels & BIT(i)) {
855 contiguous++;
856 num_of_enabled++;
857 } else {
858 contiguous = 0;
859 continue;
860 }
861
862 /* P802.11ay defines that the total number of subfields
863 * set to one does not exceed 4.
864 */
865 if (num_of_enabled > 4)
866 return 0;
867
868 if (!hostapd_is_usable_chan(iface, freq, 1))
869 return 0;
870
871 if (contiguous > max_contiguous)
872 max_contiguous = contiguous;
873 }
874
875 /* Check if the EDMG configuration is valid under the limitations
876 * of P802.11ay.
877 */
878 /* check bw_config against contiguous EDMG channels */
879 switch (edmg.bw_config) {
880 case EDMG_BW_CONFIG_4:
881 if (!max_contiguous)
882 return 0;
883 break;
884 case EDMG_BW_CONFIG_5:
885 if (max_contiguous < 2)
886 return 0;
887 break;
888 default:
889 return 0;
890 }
891
892 return 1;
893 }
894
895
hostapd_is_usable_punct_bitmap(struct hostapd_iface * iface)896 static bool hostapd_is_usable_punct_bitmap(struct hostapd_iface *iface)
897 {
898 #ifdef CONFIG_IEEE80211BE
899 struct hostapd_config *conf = iface->conf;
900 u8 bw, start_chan;
901
902 if (!conf->punct_bitmap)
903 return true;
904
905 if (!conf->ieee80211be) {
906 wpa_printf(MSG_ERROR,
907 "Currently RU puncturing is supported only if ieee80211be is enabled");
908 return false;
909 }
910
911 if (iface->freq >= 2412 && iface->freq <= 2484) {
912 wpa_printf(MSG_ERROR,
913 "RU puncturing not supported in 2.4 GHz");
914 return false;
915 }
916
917 switch (conf->eht_oper_chwidth) {
918 case 0:
919 wpa_printf(MSG_ERROR,
920 "RU puncturing is supported only in 80 MHz and 160 MHz");
921 return false;
922 case 1:
923 bw = 80;
924 start_chan = conf->eht_oper_centr_freq_seg0_idx - 6;
925 break;
926 case 2:
927 bw = 160;
928 start_chan = conf->eht_oper_centr_freq_seg0_idx - 14;
929 break;
930 default:
931 return false;
932 }
933
934 if (!is_punct_bitmap_valid(bw, (conf->channel - start_chan) / 4,
935 conf->punct_bitmap)) {
936 wpa_printf(MSG_ERROR, "Invalid puncturing bitmap");
937 return false;
938 }
939 #endif /* CONFIG_IEEE80211BE */
940
941 return true;
942 }
943
944
hostapd_is_usable_chans(struct hostapd_iface * iface)945 static int hostapd_is_usable_chans(struct hostapd_iface *iface)
946 {
947 int secondary_freq;
948 struct hostapd_channel_data *pri_chan;
949
950 if (!iface->current_mode)
951 return 0;
952 pri_chan = hw_get_channel_freq(iface->current_mode->mode,
953 iface->freq, NULL,
954 iface->hw_features,
955 iface->num_hw_features);
956 if (!pri_chan) {
957 wpa_printf(MSG_ERROR, "Primary frequency not present");
958 return 0;
959 }
960 if (!hostapd_is_usable_chan(iface, pri_chan->freq, 1)) {
961 wpa_printf(MSG_ERROR, "Primary frequency not allowed");
962 return 0;
963 }
964 if (!hostapd_is_usable_edmg(iface))
965 return 0;
966
967 if (!hostapd_is_usable_punct_bitmap(iface))
968 return 0;
969
970 if (!iface->conf->secondary_channel)
971 return 1;
972
973 if (hostapd_is_usable_chan(iface, iface->freq +
974 iface->conf->secondary_channel * 20, 0)) {
975 if (iface->conf->secondary_channel == 1 &&
976 (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P))
977 return 1;
978 if (iface->conf->secondary_channel == -1 &&
979 (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M))
980 return 1;
981 }
982 if (!iface->conf->ht40_plus_minus_allowed)
983 return 0;
984
985 /* Both HT40+ and HT40- are set, pick a valid secondary channel */
986 secondary_freq = iface->freq + 20;
987 if (hostapd_is_usable_chan(iface, secondary_freq, 0) &&
988 (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P)) {
989 iface->conf->secondary_channel = 1;
990 return 1;
991 }
992
993 secondary_freq = iface->freq - 20;
994 if (hostapd_is_usable_chan(iface, secondary_freq, 0) &&
995 (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M)) {
996 iface->conf->secondary_channel = -1;
997 return 1;
998 }
999
1000 return 0;
1001 }
1002
1003
skip_mode(struct hostapd_iface * iface,struct hostapd_hw_modes * mode)1004 static bool skip_mode(struct hostapd_iface *iface,
1005 struct hostapd_hw_modes *mode)
1006 {
1007 int chan;
1008
1009 if (iface->freq > 0 && !hw_mode_get_channel(mode, iface->freq, &chan))
1010 return true;
1011
1012 if (is_6ghz_op_class(iface->conf->op_class) && iface->freq == 0 &&
1013 (mode->mode != HOSTAPD_MODE_IEEE80211A ||
1014 mode->num_channels == 0 ||
1015 !is_6ghz_freq(mode->channels[0].freq)))
1016 return true;
1017
1018 return false;
1019 }
1020
1021
hostapd_determine_mode(struct hostapd_iface * iface)1022 static void hostapd_determine_mode(struct hostapd_iface *iface)
1023 {
1024 int i;
1025 enum hostapd_hw_mode target_mode;
1026
1027 if (iface->current_mode ||
1028 iface->conf->hw_mode != HOSTAPD_MODE_IEEE80211ANY)
1029 return;
1030
1031 if (iface->freq < 4000)
1032 target_mode = HOSTAPD_MODE_IEEE80211G;
1033 else if (iface->freq > 50000)
1034 target_mode = HOSTAPD_MODE_IEEE80211AD;
1035 else
1036 target_mode = HOSTAPD_MODE_IEEE80211A;
1037
1038 for (i = 0; i < iface->num_hw_features; i++) {
1039 struct hostapd_hw_modes *mode;
1040
1041 mode = &iface->hw_features[i];
1042 if (mode->mode == target_mode) {
1043 if (skip_mode(iface, mode))
1044 continue;
1045
1046 iface->current_mode = mode;
1047 iface->conf->hw_mode = mode->mode;
1048 break;
1049 }
1050 }
1051
1052 if (!iface->current_mode)
1053 wpa_printf(MSG_ERROR, "ACS: Cannot decide mode");
1054 }
1055
1056
1057 static enum hostapd_chan_status
hostapd_check_chans(struct hostapd_iface * iface)1058 hostapd_check_chans(struct hostapd_iface *iface)
1059 {
1060 if (iface->freq) {
1061 hostapd_determine_mode(iface);
1062 if (hostapd_is_usable_chans(iface))
1063 return HOSTAPD_CHAN_VALID;
1064 else
1065 return HOSTAPD_CHAN_INVALID;
1066 }
1067
1068 /*
1069 * The user set channel=0 or channel=acs_survey
1070 * which is used to trigger ACS.
1071 */
1072
1073 switch (acs_init(iface)) {
1074 case HOSTAPD_CHAN_ACS:
1075 return HOSTAPD_CHAN_ACS;
1076 case HOSTAPD_CHAN_VALID:
1077 case HOSTAPD_CHAN_INVALID:
1078 default:
1079 return HOSTAPD_CHAN_INVALID;
1080 }
1081 }
1082
1083
hostapd_notify_bad_chans(struct hostapd_iface * iface)1084 static void hostapd_notify_bad_chans(struct hostapd_iface *iface)
1085 {
1086 if (!iface->current_mode) {
1087 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
1088 HOSTAPD_LEVEL_WARNING,
1089 "Hardware does not support configured mode");
1090 return;
1091 }
1092 hostapd_logger(iface->bss[0], NULL,
1093 HOSTAPD_MODULE_IEEE80211,
1094 HOSTAPD_LEVEL_WARNING,
1095 "Configured channel (%d) or frequency (%d) (secondary_channel=%d) not found from the channel list of the current mode (%d) %s",
1096 iface->conf->channel,
1097 iface->freq, iface->conf->secondary_channel,
1098 iface->current_mode->mode,
1099 hostapd_hw_mode_txt(iface->current_mode->mode));
1100 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
1101 HOSTAPD_LEVEL_WARNING,
1102 "Hardware does not support configured channel");
1103 }
1104
1105
hostapd_acs_completed(struct hostapd_iface * iface,int err)1106 int hostapd_acs_completed(struct hostapd_iface *iface, int err)
1107 {
1108 int ret = -1;
1109
1110 if (err)
1111 goto out;
1112
1113 switch (hostapd_check_chans(iface)) {
1114 case HOSTAPD_CHAN_VALID:
1115 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO,
1116 ACS_EVENT_COMPLETED "freq=%d channel=%d",
1117 iface->freq, iface->conf->channel);
1118 break;
1119 case HOSTAPD_CHAN_ACS:
1120 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
1121 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
1122 hostapd_notify_bad_chans(iface);
1123 goto out;
1124 case HOSTAPD_CHAN_INVALID:
1125 default:
1126 wpa_printf(MSG_ERROR, "ACS picked unusable channels");
1127 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
1128 hostapd_notify_bad_chans(iface);
1129 goto out;
1130 }
1131
1132 ret = hostapd_check_ht_capab(iface);
1133 if (ret < 0)
1134 goto out;
1135 if (ret == 1) {
1136 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
1137 return 0;
1138 }
1139
1140 ret = 0;
1141 out:
1142 return hostapd_setup_interface_complete(iface, ret);
1143 }
1144
1145
1146 /**
1147 * hostapd_select_hw_mode - Select the hardware mode
1148 * @iface: Pointer to interface data.
1149 * Returns: 0 on success, < 0 on failure
1150 *
1151 * Sets up the hardware mode, channel, rates, and passive scanning
1152 * based on the configuration.
1153 */
hostapd_select_hw_mode(struct hostapd_iface * iface)1154 int hostapd_select_hw_mode(struct hostapd_iface *iface)
1155 {
1156 int i;
1157
1158 if (iface->num_hw_features < 1)
1159 return -1;
1160
1161 if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G ||
1162 iface->conf->ieee80211n || iface->conf->ieee80211ac ||
1163 iface->conf->ieee80211ax || iface->conf->ieee80211be) &&
1164 iface->conf->channel == 14) {
1165 wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT/HE/EHT on channel 14");
1166 iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B;
1167 iface->conf->ieee80211n = 0;
1168 iface->conf->ieee80211ac = 0;
1169 iface->conf->ieee80211ax = 0;
1170 iface->conf->ieee80211be = 0;
1171 }
1172
1173 iface->current_mode = NULL;
1174 for (i = 0; i < iface->num_hw_features; i++) {
1175 struct hostapd_hw_modes *mode = &iface->hw_features[i];
1176
1177 if (mode->mode == iface->conf->hw_mode) {
1178 if (skip_mode(iface, mode))
1179 continue;
1180
1181 iface->current_mode = mode;
1182 break;
1183 }
1184 }
1185
1186 if (iface->current_mode == NULL) {
1187 if ((iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) &&
1188 (iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY)) {
1189 wpa_printf(MSG_DEBUG,
1190 "Using offloaded hw_mode=any ACS");
1191 } else if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) &&
1192 iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211ANY) {
1193 wpa_printf(MSG_DEBUG,
1194 "Using internal ACS for hw_mode=any");
1195 } else {
1196 wpa_printf(MSG_ERROR,
1197 "Hardware does not support configured mode");
1198 hostapd_logger(iface->bss[0], NULL,
1199 HOSTAPD_MODULE_IEEE80211,
1200 HOSTAPD_LEVEL_WARNING,
1201 "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)",
1202 (int) iface->conf->hw_mode);
1203 return -2;
1204 }
1205 }
1206
1207 switch (hostapd_check_chans(iface)) {
1208 case HOSTAPD_CHAN_VALID:
1209 return 0;
1210 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */
1211 return 1;
1212 case HOSTAPD_CHAN_INVALID:
1213 default:
1214 hostapd_notify_bad_chans(iface);
1215 return -3;
1216 }
1217 }
1218
1219
hostapd_hw_mode_txt(int mode)1220 const char * hostapd_hw_mode_txt(int mode)
1221 {
1222 switch (mode) {
1223 case HOSTAPD_MODE_IEEE80211A:
1224 return "IEEE 802.11a";
1225 case HOSTAPD_MODE_IEEE80211B:
1226 return "IEEE 802.11b";
1227 case HOSTAPD_MODE_IEEE80211G:
1228 return "IEEE 802.11g";
1229 case HOSTAPD_MODE_IEEE80211AD:
1230 return "IEEE 802.11ad";
1231 default:
1232 return "UNKNOWN";
1233 }
1234 }
1235
1236
hostapd_hw_get_freq(struct hostapd_data * hapd,int chan)1237 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
1238 {
1239 return hw_get_freq(hapd->iface->current_mode, chan);
1240 }
1241
1242
hostapd_hw_get_channel(struct hostapd_data * hapd,int freq)1243 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
1244 {
1245 int i, channel;
1246 struct hostapd_hw_modes *mode;
1247
1248 if (hapd->iface->current_mode) {
1249 channel = hw_get_chan(hapd->iface->current_mode->mode, freq,
1250 hapd->iface->hw_features,
1251 hapd->iface->num_hw_features);
1252 if (channel)
1253 return channel;
1254 }
1255
1256 /* Check other available modes since the channel list for the current
1257 * mode did not include the specified frequency. */
1258 if (!hapd->iface->hw_features)
1259 return 0;
1260 for (i = 0; i < hapd->iface->num_hw_features; i++) {
1261 mode = &hapd->iface->hw_features[i];
1262 channel = hw_get_chan(mode->mode, freq,
1263 hapd->iface->hw_features,
1264 hapd->iface->num_hw_features);
1265 if (channel)
1266 return channel;
1267 }
1268 return 0;
1269 }
1270
1271
hostapd_hw_skip_mode(struct hostapd_iface * iface,struct hostapd_hw_modes * mode)1272 int hostapd_hw_skip_mode(struct hostapd_iface *iface,
1273 struct hostapd_hw_modes *mode)
1274 {
1275 int i;
1276
1277 if (iface->current_mode)
1278 return mode != iface->current_mode;
1279 if (mode->mode != HOSTAPD_MODE_IEEE80211B)
1280 return 0;
1281 for (i = 0; i < iface->num_hw_features; i++) {
1282 if (iface->hw_features[i].mode == HOSTAPD_MODE_IEEE80211G)
1283 return 1;
1284 }
1285 return 0;
1286 }
1287