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>
7 * This software may be distributed under the terms of the BSD license.
8 * See README for more details.
11 #include "utils/includes.h"
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"
20 #include "ap_config.h"
21 #include "ap_drv_ops.h"
23 #include "ieee802_11.h"
25 #include "hw_features.h"
28 void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
29 size_t num_hw_features)
33 if (hw_features == NULL)
36 for (i = 0; i < num_hw_features; i++) {
37 os_free(hw_features[i].channels);
38 os_free(hw_features[i].rates);
45 #ifndef CONFIG_NO_STDOUT_DEBUG
46 static char * dfs_info(struct hostapd_channel_data *chan)
48 static char info[256];
51 switch (chan->flag & HOSTAPD_CHAN_DFS_MASK) {
52 case HOSTAPD_CHAN_DFS_UNKNOWN:
55 case HOSTAPD_CHAN_DFS_USABLE:
58 case HOSTAPD_CHAN_DFS_UNAVAILABLE:
59 state = "unavailable";
61 case HOSTAPD_CHAN_DFS_AVAILABLE:
67 os_snprintf(info, sizeof(info), " (DFS state = %s)", state);
68 info[sizeof(info) - 1] = '\0';
72 #endif /* CONFIG_NO_STDOUT_DEBUG */
75 int hostapd_get_hw_features(struct hostapd_iface *iface)
77 struct hostapd_data *hapd = iface->bss[0];
80 struct hostapd_hw_modes *modes;
82 if (hostapd_drv_none(hapd))
84 modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
86 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
88 "Fetching hardware channel/rate support not "
93 iface->hw_flags = flags;
95 hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
96 iface->hw_features = modes;
97 iface->num_hw_features = num_modes;
99 for (i = 0; i < num_modes; i++) {
100 struct hostapd_hw_modes *feature = &modes[i];
101 int dfs_enabled = hapd->iconf->ieee80211h &&
102 (iface->drv_flags & WPA_DRIVER_FLAGS_RADAR);
104 /* set flag for channels we can use in current regulatory
106 for (j = 0; j < feature->num_channels; j++) {
110 * Disable all channels that are marked not to allow
111 * to initiate radiation (a.k.a. passive scan and no
113 * Use radar channels only if the driver supports DFS.
115 if ((feature->channels[j].flag &
116 HOSTAPD_CHAN_RADAR) && dfs_enabled) {
118 } else if (((feature->channels[j].flag &
119 HOSTAPD_CHAN_RADAR) &&
121 WPA_DRIVER_FLAGS_DFS_OFFLOAD)) ||
122 (feature->channels[j].flag &
123 HOSTAPD_CHAN_NO_IR)) {
124 feature->channels[j].flag |=
125 HOSTAPD_CHAN_DISABLED;
128 if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
131 wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
132 "chan=%d freq=%d MHz max_tx_power=%d dBm%s",
134 feature->channels[j].chan,
135 feature->channels[j].freq,
136 feature->channels[j].max_tx_power,
137 dfs ? dfs_info(&feature->channels[j]) : "");
145 int hostapd_prepare_rates(struct hostapd_iface *iface,
146 struct hostapd_hw_modes *mode)
148 int i, num_basic_rates = 0;
149 int basic_rates_a[] = { 60, 120, 240, -1 };
150 int basic_rates_b[] = { 10, 20, -1 };
151 int basic_rates_g[] = { 10, 20, 55, 110, -1 };
154 if (iface->conf->basic_rates)
155 basic_rates = iface->conf->basic_rates;
156 else switch (mode->mode) {
157 case HOSTAPD_MODE_IEEE80211A:
158 basic_rates = basic_rates_a;
160 case HOSTAPD_MODE_IEEE80211B:
161 basic_rates = basic_rates_b;
163 case HOSTAPD_MODE_IEEE80211G:
164 basic_rates = basic_rates_g;
166 case HOSTAPD_MODE_IEEE80211AD:
167 return 0; /* No basic rates for 11ad */
173 while (basic_rates[i] >= 0)
176 i++; /* -1 termination */
177 os_free(iface->basic_rates);
178 iface->basic_rates = os_malloc(i * sizeof(int));
179 if (iface->basic_rates)
180 os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int));
182 os_free(iface->current_rates);
183 iface->num_rates = 0;
185 iface->current_rates =
186 os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data));
187 if (!iface->current_rates) {
188 wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
193 for (i = 0; i < mode->num_rates; i++) {
194 struct hostapd_rate_data *rate;
196 if (iface->conf->supported_rates &&
197 !hostapd_rate_found(iface->conf->supported_rates,
201 rate = &iface->current_rates[iface->num_rates];
202 rate->rate = mode->rates[i];
203 if (hostapd_rate_found(basic_rates, rate->rate)) {
204 rate->flags |= HOSTAPD_RATE_BASIC;
207 wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
208 iface->num_rates, rate->rate, rate->flags);
212 if ((iface->num_rates == 0 || num_basic_rates == 0) &&
213 (!iface->conf->ieee80211n || !iface->conf->require_ht)) {
214 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
215 "rate sets (%d,%d).",
216 iface->num_rates, num_basic_rates);
224 #ifdef CONFIG_IEEE80211N
225 static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
227 int pri_chan, sec_chan;
229 if (!iface->conf->secondary_channel)
230 return 1; /* HT40 not used */
232 pri_chan = iface->conf->channel;
233 sec_chan = pri_chan + iface->conf->secondary_channel * 4;
235 return allowed_ht40_channel_pair(iface->current_mode, pri_chan,
240 static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
242 if (iface->conf->secondary_channel > 0) {
243 iface->conf->channel += 4;
244 iface->conf->secondary_channel = -1;
246 iface->conf->channel -= 4;
247 iface->conf->secondary_channel = 1;
252 static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
253 struct wpa_scan_results *scan_res)
255 int pri_chan, sec_chan;
258 pri_chan = iface->conf->channel;
259 sec_chan = pri_chan + iface->conf->secondary_channel * 4;
261 res = check_40mhz_5g(iface->current_mode, scan_res, pri_chan, sec_chan);
264 if (iface->conf->no_pri_sec_switch) {
265 wpa_printf(MSG_DEBUG,
266 "Cannot switch PRI/SEC channels due to local constraint");
268 ieee80211n_switch_pri_sec(iface);
276 static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
277 struct wpa_scan_results *scan_res)
279 int pri_chan, sec_chan;
281 pri_chan = iface->conf->channel;
282 sec_chan = pri_chan + iface->conf->secondary_channel * 4;
284 return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan,
289 static void ieee80211n_check_scan(struct hostapd_iface *iface)
291 struct wpa_scan_results *scan_res;
295 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
296 * allowed per IEEE Std 802.11-2012, 10.15.3.2 */
298 iface->scan_cb = NULL;
300 scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
301 if (scan_res == NULL) {
302 hostapd_setup_interface_complete(iface, 1);
306 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
307 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
309 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
310 wpa_scan_results_free(scan_res);
312 iface->secondary_ch = iface->conf->secondary_channel;
314 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
315 "channel pri=%d sec=%d based on overlapping BSSes",
316 iface->conf->channel,
317 iface->conf->channel +
318 iface->conf->secondary_channel * 4);
319 iface->conf->secondary_channel = 0;
320 if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
322 * TODO: Could consider scheduling another scan to check
323 * if channel width can be changed if no coex reports
324 * are received from associating stations.
329 res = ieee80211n_allowed_ht40_channel_pair(iface);
331 iface->conf->secondary_channel = 0;
332 wpa_printf(MSG_INFO, "Fallback to 20 MHz");
335 hostapd_setup_interface_complete(iface, !res);
339 static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
340 struct wpa_driver_scan_params *params)
342 /* Scan only the affected frequency range */
343 int pri_freq, sec_freq;
344 int affected_start, affected_end;
346 struct hostapd_hw_modes *mode;
348 if (iface->current_mode == NULL)
351 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
352 if (iface->conf->secondary_channel > 0)
353 sec_freq = pri_freq + 20;
355 sec_freq = pri_freq - 20;
357 * Note: Need to find the PRI channel also in cases where the affected
358 * channel is the SEC channel of a 40 MHz BSS, so need to include the
359 * scanning coverage here to be 40 MHz from the center frequency.
361 affected_start = (pri_freq + sec_freq) / 2 - 40;
362 affected_end = (pri_freq + sec_freq) / 2 + 40;
363 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
364 affected_start, affected_end);
366 mode = iface->current_mode;
367 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
368 if (params->freqs == NULL)
372 for (i = 0; i < mode->num_channels; i++) {
373 struct hostapd_channel_data *chan = &mode->channels[i];
374 if (chan->flag & HOSTAPD_CHAN_DISABLED)
376 if (chan->freq < affected_start ||
377 chan->freq > affected_end)
379 params->freqs[pos++] = chan->freq;
384 static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface,
385 struct wpa_driver_scan_params *params)
387 /* Scan only the affected frequency range */
389 int affected_start, affected_end;
391 struct hostapd_hw_modes *mode;
393 if (iface->current_mode == NULL)
396 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
397 if (iface->conf->secondary_channel > 0) {
398 affected_start = pri_freq - 10;
399 affected_end = pri_freq + 30;
401 affected_start = pri_freq - 30;
402 affected_end = pri_freq + 10;
404 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
405 affected_start, affected_end);
407 mode = iface->current_mode;
408 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
409 if (params->freqs == NULL)
413 for (i = 0; i < mode->num_channels; i++) {
414 struct hostapd_channel_data *chan = &mode->channels[i];
415 if (chan->flag & HOSTAPD_CHAN_DISABLED)
417 if (chan->freq < affected_start ||
418 chan->freq > affected_end)
420 params->freqs[pos++] = chan->freq;
425 static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
427 #define HT2040_COEX_SCAN_RETRY 15
428 struct hostapd_iface *iface = eloop_data;
429 struct wpa_driver_scan_params params;
432 os_memset(¶ms, 0, sizeof(params));
433 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
434 ieee80211n_scan_channels_2g4(iface, ¶ms);
436 ieee80211n_scan_channels_5g(iface, ¶ms);
438 ret = hostapd_driver_scan(iface->bss[0], ¶ms);
439 iface->num_ht40_scan_tries++;
440 os_free(params.freqs);
443 iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
444 wpa_printf(MSG_ERROR,
445 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
446 ret, strerror(-ret), iface->num_ht40_scan_tries);
447 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
452 iface->scan_cb = ieee80211n_check_scan;
456 wpa_printf(MSG_DEBUG,
457 "Failed to request a scan in device, bringing up in HT20 mode");
458 iface->conf->secondary_channel = 0;
459 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
460 hostapd_setup_interface_complete(iface, 0);
464 void hostapd_stop_setup_timers(struct hostapd_iface *iface)
466 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
470 static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
472 struct wpa_driver_scan_params params;
475 if (!iface->conf->secondary_channel)
476 return 0; /* HT40 not used */
478 hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
479 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
481 os_memset(¶ms, 0, sizeof(params));
482 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
483 ieee80211n_scan_channels_2g4(iface, ¶ms);
485 ieee80211n_scan_channels_5g(iface, ¶ms);
487 ret = hostapd_driver_scan(iface->bss[0], ¶ms);
488 os_free(params.freqs);
491 wpa_printf(MSG_ERROR,
492 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
493 ret, strerror(-ret));
494 iface->num_ht40_scan_tries = 1;
495 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
496 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
501 wpa_printf(MSG_ERROR,
502 "Failed to request a scan of neighboring BSSes ret=%d (%s)",
503 ret, strerror(-ret));
507 iface->scan_cb = ieee80211n_check_scan;
512 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
514 u16 hw = iface->current_mode->ht_capab;
515 u16 conf = iface->conf->ht_capab;
517 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
518 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
519 wpa_printf(MSG_ERROR, "Driver does not support configured "
520 "HT capability [LDPC]");
525 * Driver ACS chosen channel may not be HT40 due to internal driver
528 if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
529 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
530 wpa_printf(MSG_ERROR, "Driver does not support configured "
531 "HT capability [HT40*]");
535 switch (conf & HT_CAP_INFO_SMPS_MASK) {
536 case HT_CAP_INFO_SMPS_STATIC:
537 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_STATIC)) {
538 wpa_printf(MSG_ERROR,
539 "Driver does not support configured HT capability [SMPS-STATIC]");
543 case HT_CAP_INFO_SMPS_DYNAMIC:
544 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_DYNAMIC)) {
545 wpa_printf(MSG_ERROR,
546 "Driver does not support configured HT capability [SMPS-DYNAMIC]");
550 case HT_CAP_INFO_SMPS_DISABLED:
555 if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
556 !(hw & HT_CAP_INFO_GREEN_FIELD)) {
557 wpa_printf(MSG_ERROR, "Driver does not support configured "
558 "HT capability [GF]");
562 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
563 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
564 wpa_printf(MSG_ERROR, "Driver does not support configured "
565 "HT capability [SHORT-GI-20]");
569 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
570 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
571 wpa_printf(MSG_ERROR, "Driver does not support configured "
572 "HT capability [SHORT-GI-40]");
576 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
577 wpa_printf(MSG_ERROR, "Driver does not support configured "
578 "HT capability [TX-STBC]");
582 if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
583 (hw & HT_CAP_INFO_RX_STBC_MASK)) {
584 wpa_printf(MSG_ERROR, "Driver does not support configured "
585 "HT capability [RX-STBC*]");
589 if ((conf & HT_CAP_INFO_DELAYED_BA) &&
590 !(hw & HT_CAP_INFO_DELAYED_BA)) {
591 wpa_printf(MSG_ERROR, "Driver does not support configured "
592 "HT capability [DELAYED-BA]");
596 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
597 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
598 wpa_printf(MSG_ERROR, "Driver does not support configured "
599 "HT capability [MAX-AMSDU-7935]");
603 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
604 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
605 wpa_printf(MSG_ERROR, "Driver does not support configured "
606 "HT capability [DSSS_CCK-40]");
610 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
611 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
612 wpa_printf(MSG_ERROR, "Driver does not support configured "
613 "HT capability [LSIG-TXOP-PROT]");
621 #ifdef CONFIG_IEEE80211AC
623 static int ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap, const char *name)
625 u32 req_cap = conf & cap;
628 * Make sure we support all requested capabilities.
629 * NOTE: We assume that 'cap' represents a capability mask,
630 * not a discrete value.
632 if ((hw & req_cap) != req_cap) {
633 wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]",
641 static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 mask,
645 u32 hw_max = hw & mask;
646 u32 conf_val = conf & mask;
648 if (conf_val > hw_max) {
649 wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)",
650 name, conf_val >> shift, hw_max >> shift);
657 static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface)
659 struct hostapd_hw_modes *mode = iface->current_mode;
660 u32 hw = mode->vht_capab;
661 u32 conf = iface->conf->vht_capab;
663 wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x",
666 if (mode->mode == HOSTAPD_MODE_IEEE80211G &&
667 iface->conf->bss[0]->vendor_vht &&
668 mode->vht_capab == 0 && iface->hw_features) {
671 for (i = 0; i < iface->num_hw_features; i++) {
672 if (iface->hw_features[i].mode ==
673 HOSTAPD_MODE_IEEE80211A) {
674 mode = &iface->hw_features[i];
675 hw = mode->vht_capab;
676 wpa_printf(MSG_DEBUG,
677 "update hw vht capab based on 5 GHz band: 0x%x",
684 #define VHT_CAP_CHECK(cap) \
686 if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \
690 #define VHT_CAP_CHECK_MAX(cap) \
692 if (!ieee80211ac_cap_check_max(hw, conf, cap, cap ## _SHIFT, \
697 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK);
698 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ);
699 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ);
700 VHT_CAP_CHECK(VHT_CAP_RXLDPC);
701 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80);
702 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160);
703 VHT_CAP_CHECK(VHT_CAP_TXSTBC);
704 VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK);
705 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE);
706 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE);
707 VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX);
708 VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX);
709 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE);
710 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE);
711 VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS);
712 VHT_CAP_CHECK(VHT_CAP_HTC_VHT);
713 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX);
714 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB);
715 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB);
716 VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN);
717 VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN);
720 #undef VHT_CAP_CHECK_MAX
724 #endif /* CONFIG_IEEE80211AC */
726 #endif /* CONFIG_IEEE80211N */
729 int hostapd_check_ht_capab(struct hostapd_iface *iface)
731 #ifdef CONFIG_IEEE80211N
733 if (!iface->conf->ieee80211n)
736 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B &&
737 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G &&
738 (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) {
739 wpa_printf(MSG_DEBUG,
740 "Disable HT capability [DSSS_CCK-40] on 5 GHz band");
741 iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ;
744 if (!ieee80211n_supported_ht_capab(iface))
746 #ifdef CONFIG_IEEE80211AC
747 if (!ieee80211ac_supported_vht_capab(iface))
749 #endif /* CONFIG_IEEE80211AC */
750 ret = ieee80211n_check_40mhz(iface);
753 if (!ieee80211n_allowed_ht40_channel_pair(iface))
755 #endif /* CONFIG_IEEE80211N */
761 static int hostapd_is_usable_chan(struct hostapd_iface *iface,
762 int channel, int primary)
765 struct hostapd_channel_data *chan;
767 if (!iface->current_mode)
770 for (i = 0; i < iface->current_mode->num_channels; i++) {
771 chan = &iface->current_mode->channels[i];
772 if (chan->chan != channel)
775 if (!(chan->flag & HOSTAPD_CHAN_DISABLED))
778 wpa_printf(MSG_DEBUG,
779 "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s",
780 primary ? "" : "Configured HT40 secondary ",
781 i, chan->chan, chan->flag,
782 chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "",
783 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : "");
790 static int hostapd_is_usable_chans(struct hostapd_iface *iface)
792 if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))
795 if (!iface->conf->secondary_channel)
798 return hostapd_is_usable_chan(iface, iface->conf->channel +
799 iface->conf->secondary_channel * 4, 0);
803 static enum hostapd_chan_status
804 hostapd_check_chans(struct hostapd_iface *iface)
806 if (iface->conf->channel) {
807 if (hostapd_is_usable_chans(iface))
808 return HOSTAPD_CHAN_VALID;
810 return HOSTAPD_CHAN_INVALID;
814 * The user set channel=0 or channel=acs_survey
815 * which is used to trigger ACS.
818 switch (acs_init(iface)) {
819 case HOSTAPD_CHAN_ACS:
820 return HOSTAPD_CHAN_ACS;
821 case HOSTAPD_CHAN_VALID:
822 case HOSTAPD_CHAN_INVALID:
824 return HOSTAPD_CHAN_INVALID;
829 static void hostapd_notify_bad_chans(struct hostapd_iface *iface)
831 if (!iface->current_mode) {
832 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
833 HOSTAPD_LEVEL_WARNING,
834 "Hardware does not support configured mode");
837 hostapd_logger(iface->bss[0], NULL,
838 HOSTAPD_MODULE_IEEE80211,
839 HOSTAPD_LEVEL_WARNING,
840 "Configured channel (%d) not found from the "
841 "channel list of current mode (%d) %s",
842 iface->conf->channel,
843 iface->current_mode->mode,
844 hostapd_hw_mode_txt(iface->current_mode->mode));
845 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
846 HOSTAPD_LEVEL_WARNING,
847 "Hardware does not support configured channel");
851 int hostapd_acs_completed(struct hostapd_iface *iface, int err)
858 switch (hostapd_check_chans(iface)) {
859 case HOSTAPD_CHAN_VALID:
860 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO,
861 ACS_EVENT_COMPLETED "freq=%d channel=%d",
862 hostapd_hw_get_freq(iface->bss[0],
863 iface->conf->channel),
864 iface->conf->channel);
866 case HOSTAPD_CHAN_ACS:
867 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
868 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
869 hostapd_notify_bad_chans(iface);
871 case HOSTAPD_CHAN_INVALID:
873 wpa_printf(MSG_ERROR, "ACS picked unusable channels");
874 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
875 hostapd_notify_bad_chans(iface);
879 ret = hostapd_check_ht_capab(iface);
883 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
889 return hostapd_setup_interface_complete(iface, ret);
894 * hostapd_select_hw_mode - Select the hardware mode
895 * @iface: Pointer to interface data.
896 * Returns: 0 on success, < 0 on failure
898 * Sets up the hardware mode, channel, rates, and passive scanning
899 * based on the configuration.
901 int hostapd_select_hw_mode(struct hostapd_iface *iface)
905 if (iface->num_hw_features < 1)
908 if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G ||
909 iface->conf->ieee80211n || iface->conf->ieee80211ac) &&
910 iface->conf->channel == 14) {
911 wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14");
912 iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B;
913 iface->conf->ieee80211n = 0;
914 iface->conf->ieee80211ac = 0;
917 iface->current_mode = NULL;
918 for (i = 0; i < iface->num_hw_features; i++) {
919 struct hostapd_hw_modes *mode = &iface->hw_features[i];
920 if (mode->mode == iface->conf->hw_mode) {
921 iface->current_mode = mode;
926 if (iface->current_mode == NULL) {
927 if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) ||
928 !(iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY))
930 wpa_printf(MSG_ERROR,
931 "Hardware does not support configured mode");
932 hostapd_logger(iface->bss[0], NULL,
933 HOSTAPD_MODULE_IEEE80211,
934 HOSTAPD_LEVEL_WARNING,
935 "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)",
936 (int) iface->conf->hw_mode);
941 switch (hostapd_check_chans(iface)) {
942 case HOSTAPD_CHAN_VALID:
944 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */
946 case HOSTAPD_CHAN_INVALID:
948 hostapd_notify_bad_chans(iface);
954 const char * hostapd_hw_mode_txt(int mode)
957 case HOSTAPD_MODE_IEEE80211A:
958 return "IEEE 802.11a";
959 case HOSTAPD_MODE_IEEE80211B:
960 return "IEEE 802.11b";
961 case HOSTAPD_MODE_IEEE80211G:
962 return "IEEE 802.11g";
963 case HOSTAPD_MODE_IEEE80211AD:
964 return "IEEE 802.11ad";
971 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
973 return hw_get_freq(hapd->iface->current_mode, chan);
977 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
979 return hw_get_chan(hapd->iface->current_mode, freq);