Support VHT channel width change for CSA

When building Beacon and Probe Response frames for the target channel,
consider bandwidth parameter for VHT channels. In addition, add support
for updating vht_oper_centr_freq_seg0_idx and
vht_oper_centr_freq_seg1_idx.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>

src/ap/hostapd.c

@@ -12,6 +12,7 @@
 #include "utils/eloop.h"
 #include "common/ieee802_11_defs.h"
 #include "common/wpa_ctrl.h"
+#include "common/hw_features_common.h"
 #include "radius/radius_client.h"
 #include "radius/radius_das.h"
 #include "eap_server/tncs.h"
@@ -2744,9 +2745,9 @@ free_ap_params:
 
 
 /*
- * TODO: This flow currently supports only changing frequency within the
- * same hw_mode. Any other changes to MAC parameters or provided settings (even
- * width) are not supported.
+ * TODO: This flow currently supports only changing channel and width within
+ * the same hw_mode. Any other changes to MAC parameters or provided settings
+ * are not supported.
  */
 static int hostapd_change_config_freq(struct hostapd_data *hapd,
 				      struct hostapd_config *conf,
@@ -2765,15 +2766,44 @@ static int hostapd_change_config_freq(struct hostapd_data *hapd,
 		return -1;
 
 	/* if a pointer to old_params is provided we save previous state */
-	if (old_params) {
-		old_params->channel = conf->channel;
-		old_params->ht_enabled = conf->ieee80211n;
-		old_params->sec_channel_offset = conf->secondary_channel;
+	if (old_params &&
+	    hostapd_set_freq_params(old_params, conf->hw_mode,
+				    hostapd_hw_get_freq(hapd, conf->channel),
+				    conf->channel, conf->ieee80211n,
+				    conf->ieee80211ac,
+				    conf->secondary_channel,
+				    conf->vht_oper_chwidth,
+				    conf->vht_oper_centr_freq_seg0_idx,
+				    conf->vht_oper_centr_freq_seg1_idx,
+				    conf->vht_capab))
+		return -1;
+
+	switch (params->bandwidth) {
+	case 0:
+	case 20:
+	case 40:
+		conf->vht_oper_chwidth = VHT_CHANWIDTH_USE_HT;
+		break;
+	case 80:
+		if (params->center_freq2)
+			conf->vht_oper_chwidth = VHT_CHANWIDTH_80P80MHZ;
+		else
+			conf->vht_oper_chwidth = VHT_CHANWIDTH_80MHZ;
+		break;
+	case 160:
+		conf->vht_oper_chwidth = VHT_CHANWIDTH_160MHZ;
+		break;
+	default:
+		return -1;
 	}
 
 	conf->channel = channel;
 	conf->ieee80211n = params->ht_enabled;
 	conf->secondary_channel = params->sec_channel_offset;
+	conf->vht_oper_centr_freq_seg0_idx =
+		hostapd_hw_get_channel(hapd, params->center_freq1);
+	conf->vht_oper_centr_freq_seg1_idx =
+		hostapd_hw_get_channel(hapd, params->center_freq2);
 
 	/* TODO: maybe call here hostapd_config_check here? */