hostapd: DFS with 40/80 MHz channel width support

Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>

src/ap/ap_drv_ops.c

@@ -718,36 +718,26 @@ int hostapd_drv_send_action(struct hostapd_data *hapd, unsigned int freq,
 					 len, 0);
 }
 
-
-int hostapd_start_dfs_cac(struct hostapd_data *hapd, int freq, int flags)
+int hostapd_start_dfs_cac(struct hostapd_data *hapd, int mode, int freq,
+			  int channel, int ht_enabled, int vht_enabled,
+			  int sec_channel_offset, int vht_oper_chwidth,
+			  int center_segment0, int center_segment1)
 {
 	struct hostapd_freq_params data;
 
 	if (!hapd->driver || !hapd->driver->start_dfs_cac)
 		return 0;
 
-	if (!(flags & HOSTAPD_CHAN_RADAR)) {
-		wpa_printf(MSG_ERROR, "Can't start DFS_CAC, the channel %u is "
-			   "not DFS channel", hapd->iconf->channel);
-		return -1;
-	}
-
 	if (!hapd->iface->conf->ieee80211h) {
 		wpa_printf(MSG_ERROR, "Can't start DFS CAC, DFS functionality "
 			   "is not enabled");
 		return -1;
 	}
 
-	if (hapd->iface->conf->secondary_channel) {
-		wpa_printf(MSG_ERROR, "Can't start DFS CAC, DFS functionality "
-			   "on HT40 is not supported");
-		return -1;
-	}
-
-	if (hostapd_set_freq_params(&data, hapd->iconf->hw_mode, freq,
-				    hapd->iconf->channel,
-				    hapd->iconf->ieee80211n,
-				    0, 0, 0, 0, 0))
+	if (hostapd_set_freq_params(&data, mode, freq, channel, ht_enabled,
+				    vht_enabled, sec_channel_offset,
+				    vht_oper_chwidth, center_segment0,
+				    center_segment1))
 		return -1;
 
 	return hapd->driver->start_dfs_cac(hapd->drv_priv, &data);

src/ap/ap_drv_ops.h

@@ -101,7 +101,10 @@ int hostapd_sta_assoc(struct hostapd_data *hapd, const u8 *addr,
 		      int reassoc, u16 status, const u8 *ie, size_t len);
 int hostapd_add_tspec(struct hostapd_data *hapd, const u8 *addr,
 		      u8 *tspec_ie, size_t tspec_ielen);
-int hostapd_start_dfs_cac(struct hostapd_data *hapd, int freq, int flags);
+int hostapd_start_dfs_cac(struct hostapd_data *hapd, int mode, int freq,
+			  int channel, int ht_enabled, int vht_enabled,
+			  int sec_channel_offset, int vht_oper_chwidth,
+			  int center_segment0, int center_segment1);
 
 
 #include "drivers/driver.h"

src/ap/dfs.c

@@ -1,6 +1,7 @@
 /*
  * DFS - Dynamic Frequency Selection
  * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2013, Qualcomm Atheros, Inc.
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -11,43 +12,247 @@
 #include "utils/common.h"
 #include "common/ieee802_11_defs.h"
 #include "hostapd.h"
-#include "hw_features.h"
 #include "ap_drv_ops.h"
 #include "drivers/driver.h"
 #include "dfs.h"
 
 
+static int dfs_get_used_n_chans(struct hostapd_data *hapd)
+{
+	int n_chans = 1;
+
+	if (hapd->iconf->ieee80211n && hapd->iconf->secondary_channel)
+		n_chans = 2;
+
+	if (hapd->iconf->ieee80211ac) {
+		switch (hapd->iconf->vht_oper_chwidth) {
+		case VHT_CHANWIDTH_USE_HT:
+			break;
+		case VHT_CHANWIDTH_80MHZ:
+			n_chans = 4;
+			break;
+		default:
+			break;
+		}
+	}
+
+	return n_chans;
+}
+
+
+static int dfs_channel_available(struct hostapd_channel_data *chan)
+{
+	if (chan->flag & HOSTAPD_CHAN_DISABLED)
+		return 0;
+	if ((chan->flag & HOSTAPD_CHAN_RADAR) &&
+	    ((chan->flag & HOSTAPD_CHAN_DFS_MASK) ==
+	     HOSTAPD_CHAN_DFS_UNAVAILABLE))
+		return 0;
+	return 1;
+}
+
+
+static int dfs_is_ht40_allowed(struct hostapd_channel_data *chan)
+{
+	int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
+			  184, 192 };
+	unsigned int i;
+
+	for (i = 0; i < sizeof(allowed) / sizeof(allowed[0]); i++) {
+		if (chan->chan == allowed[i])
+			return 1;
+	}
+
+	return 0;
+}
+
+
 static int hostapd_dfs_find_channel(struct hostapd_data *hapd,
 				    struct hostapd_channel_data **ret_chan,
 				    int idx)
 {
 	struct hostapd_hw_modes *mode;
-	struct hostapd_channel_data *chan;
-	int i, channel_idx = 0;
+	struct hostapd_channel_data *chan, *next_chan;
+	int i, j, channel_idx = 0, n_chans;
 
 	mode = hapd->iface->current_mode;
+	n_chans = dfs_get_used_n_chans(hapd);
 
+	wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans);
 	for (i = 0; i < mode->num_channels; i++) {
 		chan = &mode->channels[i];
 
-		if (chan->flag & HOSTAPD_CHAN_DISABLED)
+		/* Skip not available channels */
+		if (!dfs_channel_available(chan))
 			continue;
 
-		if (chan->flag & HOSTAPD_CHAN_RADAR &&
-		    chan->flag & HOSTAPD_CHAN_DFS_UNAVAILABLE)
-			continue;
+		/* Skip HT40/VHT uncompatible channels */
+		if (hapd->iconf->ieee80211n &&
+		    hapd->iconf->secondary_channel) {
+			if (!dfs_is_ht40_allowed(chan))
+				continue;
+
+			for (j = 1; j < n_chans; j++) {
+				next_chan = &mode->channels[i + j];
+				if (!dfs_channel_available(next_chan))
+					break;
+			}
+			if (j != n_chans)
+				continue;
+
+			/* Set HT40+ */
+			hapd->iconf->secondary_channel = 1;
+		}
 
 		if (ret_chan && idx == channel_idx) {
 			wpa_printf(MSG_DEBUG, "Selected ch. #%d", chan->chan);
 			*ret_chan = chan;
 			return idx;
 		}
+		wpa_printf(MSG_DEBUG, "Adding channel: %d", chan->chan);
 		channel_idx++;
 	}
 	return channel_idx;
 }
 
 
+static void dfs_adjust_vht_center_freq(struct hostapd_data *hapd,
+				       struct hostapd_channel_data *chan)
+{
+	if (!hapd->iconf->ieee80211ac)
+		return;
+
+	if (!chan)
+		return;
+
+	switch (hapd->iconf->vht_oper_chwidth) {
+	case VHT_CHANWIDTH_USE_HT:
+		hapd->iconf->vht_oper_centr_freq_seg0_idx = chan->chan + 2;
+		break;
+	case VHT_CHANWIDTH_80MHZ:
+		hapd->iconf->vht_oper_centr_freq_seg0_idx = chan->chan + 6;
+		break;
+	default:
+		wpa_printf(MSG_INFO, "DFS only VHT20/40/80 is supported now");
+		break;
+	}
+
+	wpa_printf(MSG_DEBUG, "DFS adjusting VHT center frequency: %d",
+		   hapd->iconf->vht_oper_centr_freq_seg0_idx);
+}
+
+
+/* Return start channel idx we will use for mode->channels[idx] */
+static int dfs_get_start_chan_idx(struct hostapd_data *hapd)
+{
+	struct hostapd_hw_modes *mode;
+	struct hostapd_channel_data *chan;
+	int channel_no = hapd->iconf->channel;
+	int res = -1, i;
+
+	/* HT40- */
+	if (hapd->iconf->ieee80211n && hapd->iconf->secondary_channel == -1)
+		channel_no -= 4;
+
+	/* VHT */
+	if (hapd->iconf->ieee80211ac) {
+		switch (hapd->iconf->vht_oper_chwidth) {
+		case VHT_CHANWIDTH_USE_HT:
+			break;
+		case VHT_CHANWIDTH_80MHZ:
+			channel_no =
+				hapd->iconf->vht_oper_centr_freq_seg0_idx - 6;
+			break;
+		default:
+			wpa_printf(MSG_INFO,
+				   "DFS only VHT20/40/80 is supported now");
+			channel_no = -1;
+			break;
+		}
+	}
+
+	/* Get idx */
+	mode = hapd->iface->current_mode;
+	for (i = 0; i < mode->num_channels; i++) {
+		chan = &mode->channels[i];
+		if (chan->chan == channel_no) {
+			res = i;
+			break;
+		}
+	}
+
+	if (res == -1)
+		wpa_printf(MSG_DEBUG, "DFS chan_idx seems wrong: -1");
+
+	return res;
+}
+
+
+/* At least one channel have radar flag */
+static int dfs_check_chans_radar(struct hostapd_data *hapd, int start_chan_idx,
+				 int n_chans)
+{
+	struct hostapd_channel_data *channel;
+	struct hostapd_hw_modes *mode;
+	int i, res = 0;
+
+	mode = hapd->iface->current_mode;
+
+	for (i = 0; i < n_chans; i++) {
+		channel = &mode->channels[start_chan_idx + i];
+		if (channel->flag & HOSTAPD_CHAN_RADAR)
+			res++;
+	}
+
+	return res;
+}
+
+
+/* All channels available */
+static int dfs_check_chans_available(struct hostapd_data *hapd,
+				     int start_chan_idx, int n_chans)
+{
+	struct hostapd_channel_data *channel;
+	struct hostapd_hw_modes *mode;
+	int i;
+
+	mode = hapd->iface->current_mode;
+
+	for(i = 0; i < n_chans; i++) {
+		channel = &mode->channels[start_chan_idx + i];
+		if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) !=
+		    HOSTAPD_CHAN_DFS_AVAILABLE)
+			break;
+	}
+
+	return i == n_chans;
+}
+
+
+/* At least one channel unavailable */
+static int dfs_check_chans_unavailable(struct hostapd_data *hapd,
+				       int start_chan_idx,
+				       int n_chans)
+{
+	struct hostapd_channel_data *channel;
+	struct hostapd_hw_modes *mode;
+	int i, res = 0;
+
+	mode = hapd->iface->current_mode;
+
+	for(i = 0; i < n_chans; i++) {
+		channel = &mode->channels[start_chan_idx + i];
+		if (channel->flag & HOSTAPD_CHAN_DISABLED)
+			res++;
+		if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) ==
+		    HOSTAPD_CHAN_DFS_UNAVAILABLE)
+			res++;
+	}
+
+	return res;
+}
+
+
 struct hostapd_channel_data * hostapd_dfs_get_valid_channel(
 	struct hostapd_data *hapd)
 {
@@ -73,11 +278,14 @@ struct hostapd_channel_data * hostapd_dfs_get_valid_channel(
 		hostapd_dfs_find_channel(hapd, &chan, new_channel_idx);
 	}
 
+	/* VHT */
+	dfs_adjust_vht_center_freq(hapd, chan);
+
 	return chan;
 }
 
 
-int ieee802_11_set_dfs_state(struct hostapd_data *hapd, int freq, u32 state)
+static int set_dfs_state_freq(struct hostapd_data *hapd, int freq, u32 state)
 {
 	struct hostapd_hw_modes *mode;
 	struct hostapd_channel_data *chan = NULL;
@@ -87,11 +295,7 @@ int ieee802_11_set_dfs_state(struct hostapd_data *hapd, int freq, u32 state)
 	if (mode == NULL)
 		return 0;
 
-	if (mode->mode != HOSTAPD_MODE_IEEE80211A) {
-		wpa_printf(MSG_WARNING, "current_mode != IEEE80211A");
-		return 0;
-	}
-
+	wpa_printf(MSG_DEBUG, "set_dfs_state 0x%X for %d MHz", state, freq);
 	for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
 		chan = &hapd->iface->current_mode->channels[i];
 		if (chan->freq == freq) {
@@ -107,6 +311,113 @@ int ieee802_11_set_dfs_state(struct hostapd_data *hapd, int freq, u32 state)
 }
 
 
+static int set_dfs_state(struct hostapd_data *hapd, int freq, int ht_enabled,
+			 int chan_offset, int chan_width, int cf1,
+			 int cf2, u32 state)
+{
+	int n_chans = 1, i;
+	struct hostapd_hw_modes *mode;
+	int frequency = freq;
+	int ret = 0;
+
+	mode = hapd->iface->current_mode;
+	if (mode == NULL)
+		return 0;
+
+	if (mode->mode != HOSTAPD_MODE_IEEE80211A) {
+		wpa_printf(MSG_WARNING, "current_mode != IEEE80211A");
+		return 0;
+	}
+
+	/* Seems cf1 and chan_width is enough here */
+	switch (chan_width) {
+	case CHAN_WIDTH_20_NOHT:
+	case CHAN_WIDTH_20:
+		n_chans = 1;
+		frequency = cf1;
+		break;
+	case CHAN_WIDTH_40:
+		n_chans = 2;
+		frequency = cf1 - 10;
+		break;
+	case CHAN_WIDTH_80:
+		n_chans = 4;
+		frequency = cf1 - 30;
+		break;
+	default:
+		wpa_printf(MSG_INFO, "DFS chan_width %d not supported",
+			   chan_width);
+		break;
+	}
+
+	wpa_printf(MSG_DEBUG, "DFS freq: %dMHz, n_chans: %d", frequency,
+		   n_chans);
+	for (i = 0; i < n_chans; i++) {
+		ret += set_dfs_state_freq(hapd, frequency, state);
+		frequency = frequency + 20;
+	}
+
+	return ret;
+}
+
+
+static int dfs_are_channels_overlapped(struct hostapd_data *hapd, int freq,
+				       int chan_width, int cf1, int cf2)
+{
+	int start_chan_idx;
+	struct hostapd_hw_modes *mode;
+	struct hostapd_channel_data *chan;
+	int n_chans, i, j, frequency = freq, radar_n_chans = 1;
+	u8 radar_chan;
+	int res = 0;
+
+	if (hapd->iface->freq == freq)
+		res++;
+
+	/* Our configuration */
+	mode = hapd->iface->current_mode;
+	start_chan_idx = dfs_get_start_chan_idx(hapd);
+	n_chans = dfs_get_used_n_chans(hapd);
+
+	/* Reported via radar event */
+	switch (chan_width) {
+	case CHAN_WIDTH_20_NOHT:
+	case CHAN_WIDTH_20:
+		radar_n_chans = 1;
+		frequency = cf1;
+		break;
+	case CHAN_WIDTH_40:
+		radar_n_chans = 2;
+		frequency = cf1 - 10;
+		break;
+	case CHAN_WIDTH_80:
+		radar_n_chans = 4;
+		frequency = cf1 - 30;
+		break;
+	default:
+		wpa_printf(MSG_INFO, "DFS chan_width %d not supported",
+			   chan_width);
+		break;
+	}
+
+	ieee80211_freq_to_chan(frequency, &radar_chan);
+
+	for (i = 0; i < n_chans; i++) {
+		chan = &mode->channels[start_chan_idx + i];
+		for (j = 0; j < radar_n_chans; j++) {
+			wpa_printf(MSG_DEBUG, "checking our: %d, radar: %d",
+				   chan->chan, radar_chan + j * 4);
+			if (chan->chan == radar_chan + j * 4)
+				res++;
+		}
+	}
+
+	wpa_printf(MSG_DEBUG, "overlapped: %d", res);
+
+	return res;
+}
+
+
 /*
  * Main DFS handler
  * 1 - continue channel/ap setup
@@ -115,28 +426,40 @@ int ieee802_11_set_dfs_state(struct hostapd_data *hapd, int freq, u32 state)
  */
 int hostapd_handle_dfs(struct hostapd_data *hapd)
 {
-	int flags;
 	struct hostapd_channel_data *channel;
-
-	/* Handle DFS channel */
-check_dfs_chan_again:
-	flags = hostapd_hw_get_channel_flag(hapd, hapd->iconf->channel);
-	if (flags & HOSTAPD_CHAN_RADAR) {
-		switch (flags & HOSTAPD_CHAN_DFS_MASK) {
-		case HOSTAPD_CHAN_DFS_USABLE:
-			wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz",
-				   hapd->iface->freq);
-			if (hostapd_start_dfs_cac(hapd,
-						  hapd->iface->freq,
-						  flags)) {
-				wpa_printf(MSG_DEBUG, "DFS start_dfs_cac() failed");
-				return -1;
-			}
-			/* Continue initialisation after CAC */
-			return 0;
-		case HOSTAPD_CHAN_DFS_UNAVAILABLE:
-			wpa_printf(MSG_DEBUG, "HOSTAPD_CHAN_DFS_UNAVAILABLE, get new chan");
-			/* find other channel here */
+	int res, n_chans, start_chan_idx;
+
+	do {
+		/* Get start (first) channel for current configuration */
+		start_chan_idx = dfs_get_start_chan_idx(hapd);
+		if (start_chan_idx == -1)
+			return -1;
+
+		/* Get number of used channels, depend on width */
+		n_chans = dfs_get_used_n_chans(hapd);
+
+		/* Check if any of configured channels require DFS */
+		res = dfs_check_chans_radar(hapd, start_chan_idx, n_chans);
+		wpa_printf(MSG_DEBUG,
+			   "DFS %d channels required radar detection",
+			   res);
+		if (!res)
+			return 1;
+
+		/* Check if all channels are DFS available */
+		res = dfs_check_chans_available(hapd, start_chan_idx, n_chans);
+		wpa_printf(MSG_DEBUG,
+			   "DFS all channels available, (SKIP CAC): %s",
+			   res ? "yes" : "no");
+		if (res)
+			return 1;
+
+		/* Check if any of configured channels is unavailable */
+		res = dfs_check_chans_unavailable(hapd, start_chan_idx,
+						  n_chans);
+		wpa_printf(MSG_DEBUG, "DFS %d chans unavailable - choose other channel: %s",
+			   res, res ? "yes": "no");
+		if (res) {
 			channel = hostapd_dfs_get_valid_channel(hapd);
 			if (!channel) {
 				wpa_printf(MSG_ERROR, "could not get valid channel");
@@ -144,34 +467,46 @@ check_dfs_chan_again:
 			}
 			hapd->iconf->channel = channel->chan;
 			hapd->iface->freq = channel->freq;
-			goto check_dfs_chan_again;
-		case HOSTAPD_CHAN_DFS_AVAILABLE:
-			/* We don't need CAC here */
-			wpa_printf(MSG_DEBUG, "HOSTAPD_CHAN_DFS_AVAILABLE, skip CAC");
-			break;
-		default:
-			break;
 		}
+	} while (res);
+
+	/* Finally start CAC */
+	wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz", hapd->iface->freq);
+	if (hostapd_start_dfs_cac(hapd, hapd->iconf->hw_mode,
+				  hapd->iface->freq,
+				  hapd->iconf->channel,
+				  hapd->iconf->ieee80211n,
+				  hapd->iconf->ieee80211ac,
+				  hapd->iconf->secondary_channel,
+				  hapd->iconf->vht_oper_chwidth,
+				  hapd->iconf->vht_oper_centr_freq_seg0_idx,
+				  hapd->iconf->vht_oper_centr_freq_seg1_idx)) {
+		wpa_printf(MSG_DEBUG, "DFS start_dfs_cac() failed");
+		return -1;
 	}
 
-	return 1;
+	return 0;
 }
 
 
-int ieee802_11_complete_cac(struct hostapd_data *hapd, int success, int freq)
+int hostapd_dfs_complete_cac(struct hostapd_data *hapd, int success, int freq,
+			     int ht_enabled, int chan_offset, int chan_width,
+			     int cf1, int cf2)
 {
 	struct hostapd_channel_data *channel;
 	int err = 1;
 
 	if (success) {
 		/* Complete iface/ap configuration */
-		ieee802_11_set_dfs_state(hapd, freq,
-					 HOSTAPD_CHAN_DFS_AVAILABLE);
+		set_dfs_state(hapd, freq, ht_enabled, chan_offset,
+			      chan_width, cf1, cf2,
+			      HOSTAPD_CHAN_DFS_AVAILABLE);
 		hostapd_setup_interface_complete(hapd->iface, 0);
 	} else {
 		/* Switch to new channel */
-		ieee802_11_set_dfs_state(hapd, freq,
-					 HOSTAPD_CHAN_DFS_UNAVAILABLE);
+		set_dfs_state(hapd, freq, ht_enabled, chan_offset,
+			      chan_width, cf1, cf2,
+			      HOSTAPD_CHAN_DFS_UNAVAILABLE);
 		channel = hostapd_dfs_get_valid_channel(hapd);
 		if (channel) {
 			hapd->iconf->channel = channel->chan;
@@ -205,3 +540,44 @@ int ieee802_11_start_channel_switch(struct hostapd_data *hapd)
 	hostapd_setup_interface_complete(hapd->iface, err);
 	return 0;
 }
+
+
+int hostapd_dfs_radar_detected(struct hostapd_data *hapd, int freq,
+			       int ht_enabled, int chan_offset, int chan_width,
+			       int cf1, int cf2)
+{
+	int res;
+
+	if (!hapd->iconf->ieee80211h)
+		return 0;
+
+	/* mark radar frequency as invalid */
+	res = set_dfs_state(hapd, freq, ht_enabled, chan_offset,
+			    chan_width, cf1, cf2,
+			    HOSTAPD_CHAN_DFS_UNAVAILABLE);
+
+	/* Skip if reported radar event not overlapped our channels */
+	res = dfs_are_channels_overlapped(hapd, freq, chan_width, cf1, cf2);
+	if (!res)
+		return 0;
+
+	/* we are working on non-DFS channel - skip event */
+	if (res == 0)
+		return 0;
+
+	/* radar detected while operating, switch the channel. */
+	res = ieee802_11_start_channel_switch(hapd);
+
+	return res;
+}
+
+
+int hostapd_dfs_nop_finished(struct hostapd_data *hapd, int freq,
+			     int ht_enabled, int chan_offset, int chan_width,
+			     int cf1, int cf2)
+{
+	/* TODO add correct implementation here */
+	set_dfs_state(hapd, freq, ht_enabled, chan_offset, chan_width, cf1, cf2,
+		      HOSTAPD_CHAN_DFS_USABLE);
+	return 0;
+}

src/ap/dfs.h

@@ -1,6 +1,7 @@
 /*
  * DFS - Dynamic Frequency Selection
  * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2013, Qualcomm Atheros, Inc.
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -8,11 +9,17 @@
 #ifndef DFS_H
 #define DFS_H
 
-struct hostapd_channel_data * hostapd_dfs_get_valid_channel(
-	struct hostapd_data *hapd);
-int ieee802_11_complete_cac(struct hostapd_data *hapd, int success, int freq);
-int ieee802_11_set_dfs_state(struct hostapd_data *hapd, int freq, u32 state);
-int ieee802_11_start_channel_switch(struct hostapd_data *hapd);
 int hostapd_handle_dfs(struct hostapd_data *hapd);
 
+int hostapd_dfs_complete_cac(struct hostapd_data *hapd, int success, int freq,
+			     int ht_enabled, int chan_offset, int chan_width,
+			     int cf1, int cf2);
+int hostapd_dfs_radar_detected(struct hostapd_data *hapd, int freq,
+			       int ht_enabled,
+			       int chan_offset, int chan_width,
+			       int cf1, int cf2);
+int hostapd_dfs_nop_finished(struct hostapd_data *hapd, int freq,
+			     int ht_enabled,
+			     int chan_offset, int chan_width, int cf1, int cf2);
+
 #endif /* DFS_H */

src/ap/drv_callbacks.c

@@ -791,27 +791,10 @@ static void hostapd_event_get_survey(struct hostapd_data *hapd,
 static void hostapd_event_dfs_radar_detected(struct hostapd_data *hapd,
 					     struct dfs_event *radar)
 {
-	int res;
-
 	wpa_printf(MSG_DEBUG, "DFS radar detected on %d MHz", radar->freq);
-
-	if (!hapd->iconf->ieee80211h)
-		return;
-
-	/* mark radar frequency as invalid */
-	res = ieee802_11_set_dfs_state(hapd, radar->freq,
-				       HOSTAPD_CHAN_DFS_UNAVAILABLE);
-
-	/* other frequency, just mark it and return. */
-	if (hapd->iface->freq != radar->freq)
-		return;
-
-	/* we are working on non-DFS channel - skip event */
-	if (res == 0)
-		return;
-
-	/* radar detected while operating, switch the channel. */
-	ieee802_11_start_channel_switch(hapd);
+	hostapd_dfs_radar_detected(hapd, radar->freq, radar->ht_enabled,
+				   radar->chan_offset, radar->chan_width,
+				   radar->cf1, radar->cf2);
 }
 
 
@@ -819,7 +802,9 @@ static void hostapd_event_dfs_cac_finished(struct hostapd_data *hapd,
 					   struct dfs_event *radar)
 {
 	wpa_printf(MSG_DEBUG, "DFS CAC finished on %d MHz", radar->freq);
-	ieee802_11_complete_cac(hapd, 1, radar->freq);
+	hostapd_dfs_complete_cac(hapd, 1, radar->freq, radar->ht_enabled,
+				 radar->chan_offset, radar->chan_width,
+				 radar->cf1, radar->cf2);
 }
 
 
@@ -827,7 +812,9 @@ static void hostapd_event_dfs_cac_aborted(struct hostapd_data *hapd,
 					  struct dfs_event *radar)
 {
 	wpa_printf(MSG_DEBUG, "DFS CAC aborted on %d MHz", radar->freq);
-	ieee802_11_complete_cac(hapd, 0, radar->freq);
+	hostapd_dfs_complete_cac(hapd, 0, radar->freq, radar->ht_enabled,
+				 radar->chan_offset, radar->chan_width,
+				 radar->cf1, radar->cf2);
 }
 
 
@@ -835,7 +822,9 @@ static void hostapd_event_dfs_nop_finished(struct hostapd_data *hapd,
 					   struct dfs_event *radar)
 {
 	wpa_printf(MSG_DEBUG, "DFS NOP finished on %d MHz", radar->freq);
-	ieee802_11_set_dfs_state(hapd, radar->freq, HOSTAPD_CHAN_DFS_USABLE);
+	hostapd_dfs_nop_finished(hapd, radar->freq, radar->ht_enabled,
+				 radar->chan_offset, radar->chan_width,
+				 radar->cf1, radar->cf2);
 }
 
 #endif /* NEED_AP_MLME */

src/ap/hw_features.c

@@ -889,21 +889,3 @@ int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
 
 	return 0;
 }
-
-
-int hostapd_hw_get_channel_flag(struct hostapd_data *hapd, int chan)
-{
-	int i;
-
-	if (!hapd->iface->current_mode)
-		return 0;
-
-	for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
-		struct hostapd_channel_data *ch =
-			&hapd->iface->current_mode->channels[i];
-		if (ch->chan == chan)
-			return ch->flag;
-	}
-
-	return 0;
-}

src/ap/hw_features.h

@@ -28,7 +28,6 @@ int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq);
 int hostapd_check_ht_capab(struct hostapd_iface *iface);
 int hostapd_prepare_rates(struct hostapd_iface *iface,
 			  struct hostapd_hw_modes *mode);
-int hostapd_hw_get_channel_flag(struct hostapd_data *hapd, int chan);
 #else /* NEED_AP_MLME */
 static inline void
 hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,