nl80211/hostapd: Extend channel switch notify handling

Adds support for VHT by parsing bandwidth and center_freq{1,2}.

Signed-hostap: Michal Kazior <michal.kazior@tieto.com>
Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>

src/ap/drv_callbacks.c

@@ -381,14 +381,15 @@ void hostapd_event_sta_low_ack(struct hostapd_data *hapd, const u8 *addr)
 
 
 void hostapd_event_ch_switch(struct hostapd_data *hapd, int freq, int ht,
-			     int offset)
+			     int offset, int width, int cf1, int cf2)
 {
 #ifdef NEED_AP_MLME
-	int channel;
+	int channel, chwidth, seg0_idx = 0, seg1_idx = 0;
 
 	hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
 		       HOSTAPD_LEVEL_INFO, "driver had channel switch: "
-		       "freq=%d, ht=%d, offset=%d", freq, ht, offset);
+		       "freq=%d, ht=%d, offset=%d, width=%d, cf1=%d, cf2=%d",
+		       freq, ht, offset, width, cf1, cf2);
 
 	hapd->iface->freq = freq;
 
@@ -400,9 +401,43 @@ void hostapd_event_ch_switch(struct hostapd_data *hapd, int freq, int ht,
 		return;
 	}
 
+	switch (width) {
+	case CHAN_WIDTH_80:
+		chwidth = VHT_CHANWIDTH_80MHZ;
+		break;
+	case CHAN_WIDTH_80P80:
+		chwidth = VHT_CHANWIDTH_80P80MHZ;
+		break;
+	case CHAN_WIDTH_160:
+		chwidth = VHT_CHANWIDTH_160MHZ;
+		break;
+	case CHAN_WIDTH_20_NOHT:
+	case CHAN_WIDTH_20:
+	case CHAN_WIDTH_40:
+	default:
+		chwidth = VHT_CHANWIDTH_USE_HT;
+		break;
+	}
+
+	switch (hapd->iface->current_mode->mode) {
+	case HOSTAPD_MODE_IEEE80211A:
+		if (cf1 > 5000)
+			seg0_idx = (cf1 - 5000) / 5;
+		if (cf2 > 5000)
+			seg1_idx = (cf2 - 5000) / 5;
+		break;
+	default:
+		seg0_idx = hostapd_hw_get_channel(hapd, cf1);
+		seg1_idx = hostapd_hw_get_channel(hapd, cf2);
+		break;
+	}
+
 	hapd->iconf->channel = channel;
 	hapd->iconf->ieee80211n = ht;
 	hapd->iconf->secondary_channel = offset;
+	hapd->iconf->vht_oper_chwidth = chwidth;
+	hapd->iconf->vht_oper_centr_freq_seg0_idx = seg0_idx;
+	hapd->iconf->vht_oper_centr_freq_seg1_idx = seg1_idx;
 
 	if (hapd->iface->csa_in_progress && freq == hapd->iface->cs_freq) {
 		hostapd_cleanup_cs_params(hapd);
@@ -976,7 +1011,10 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
 			break;
 		hostapd_event_ch_switch(hapd, data->ch_switch.freq,
 					data->ch_switch.ht_enabled,
-					data->ch_switch.ch_offset);
+					data->ch_switch.ch_offset,
+					data->ch_switch.ch_width,
+					data->ch_switch.cf1,
+					data->ch_switch.cf2);
 		break;
 	case EVENT_CONNECT_FAILED_REASON:
 		if (!data)

src/ap/hostapd.h

@@ -414,7 +414,7 @@ int hostapd_probe_req_rx(struct hostapd_data *hapd, const u8 *sa, const u8 *da,
 			 const u8 *bssid, const u8 *ie, size_t ie_len,
 			 int ssi_signal);
 void hostapd_event_ch_switch(struct hostapd_data *hapd, int freq, int ht,
-			     int offset);
+			     int offset, int width, int cf1, int cf2);
 
 const struct hostapd_eap_user *
 hostapd_get_eap_user(struct hostapd_data *hapd, const u8 *identity,

src/drivers/driver.h

@@ -4028,11 +4028,17 @@ union wpa_event_data {
 	 * @freq: Frequency of new channel in MHz
 	 * @ht_enabled: Whether this is an HT channel
 	 * @ch_offset: Secondary channel offset
+	 * @ch_width: Channel width
+	 * @cf1: Center frequency 1
+	 * @cf2: Center frequency 2
 	 */
 	struct ch_switch {
 		int freq;
 		int ht_enabled;
 		int ch_offset;
+		enum chan_width ch_width;
+		int cf1;
+		int cf2;
 	} ch_switch;
 
 	/**

src/drivers/driver_nl80211.c

@@ -504,6 +504,27 @@ static const char * nl80211_command_to_string(enum nl80211_commands cmd)
 }
 
 
+/* Converts nl80211_chan_width to a common format */
+static enum chan_width convert2width(int width)
+{
+	switch (width) {
+	case NL80211_CHAN_WIDTH_20_NOHT:
+		return CHAN_WIDTH_20_NOHT;
+	case NL80211_CHAN_WIDTH_20:
+		return CHAN_WIDTH_20;
+	case NL80211_CHAN_WIDTH_40:
+		return CHAN_WIDTH_40;
+	case NL80211_CHAN_WIDTH_80:
+		return CHAN_WIDTH_80;
+	case NL80211_CHAN_WIDTH_80P80:
+		return CHAN_WIDTH_80P80;
+	case NL80211_CHAN_WIDTH_160:
+		return CHAN_WIDTH_160;
+	}
+	return CHAN_WIDTH_UNKNOWN;
+}
+
+
 static int is_ap_interface(enum nl80211_iftype nlmode)
 {
 	return (nlmode == NL80211_IFTYPE_AP ||
@@ -1484,36 +1505,60 @@ static void mlme_event_disconnect(struct wpa_driver_nl80211_data *drv,
 
 
 static void mlme_event_ch_switch(struct wpa_driver_nl80211_data *drv,
-				 struct nlattr *freq, struct nlattr *type)
+				 struct nlattr *ifindex, struct nlattr *freq,
+				 struct nlattr *type, struct nlattr *bw,
+				 struct nlattr *cf1, struct nlattr *cf2)
 {
+	struct i802_bss *bss;
 	union wpa_event_data data;
 	int ht_enabled = 1;
 	int chan_offset = 0;
+	int ifidx;
 
 	wpa_printf(MSG_DEBUG, "nl80211: Channel switch event");
 
-	if (!freq || !type)
+	if (!freq)
 		return;
 
-	switch (nla_get_u32(type)) {
-	case NL80211_CHAN_NO_HT:
-		ht_enabled = 0;
-		break;
-	case NL80211_CHAN_HT20:
-		break;
-	case NL80211_CHAN_HT40PLUS:
-		chan_offset = 1;
-		break;
-	case NL80211_CHAN_HT40MINUS:
-		chan_offset = -1;
-		break;
+	ifidx = nla_get_u32(ifindex);
+	for (bss = drv->first_bss; bss; bss = bss->next)
+		if (bss->ifindex == ifidx)
+			break;
+
+	if (bss == NULL) {
+		wpa_printf(MSG_WARNING, "nl80211: Unknown ifindex (%d) for channel switch, ignoring",
+			   ifidx);
+		return;
 	}
 
+	if (type) {
+		switch (nla_get_u32(type)) {
+		case NL80211_CHAN_NO_HT:
+			ht_enabled = 0;
+			break;
+		case NL80211_CHAN_HT20:
+			break;
+		case NL80211_CHAN_HT40PLUS:
+			chan_offset = 1;
+			break;
+		case NL80211_CHAN_HT40MINUS:
+			chan_offset = -1;
+			break;
+		}
+	}
+
+	os_memset(&data, 0, sizeof(data));
 	data.ch_switch.freq = nla_get_u32(freq);
 	data.ch_switch.ht_enabled = ht_enabled;
 	data.ch_switch.ch_offset = chan_offset;
+	if (bw)
+		data.ch_switch.ch_width = convert2width(nla_get_u32(bw));
+	if (cf1)
+		data.ch_switch.cf1 = nla_get_u32(cf1);
+	if (cf2)
+		data.ch_switch.cf2 = nla_get_u32(cf2);
 
-	drv->first_bss->freq = data.ch_switch.freq;
+	bss->freq = data.ch_switch.freq;
 
 	wpa_supplicant_event(drv->ctx, EVENT_CH_SWITCH, &data);
 }
@@ -2534,8 +2579,6 @@ static void nl80211_connect_failed_event(struct wpa_driver_nl80211_data *drv,
 }
 
 
-static enum chan_width convert2width(int width);
-
 static void nl80211_radar_event(struct wpa_driver_nl80211_data *drv,
 				struct nlattr **tb)
 {
@@ -2702,8 +2745,13 @@ static void do_process_drv_event(struct i802_bss *bss, int cmd,
 				   tb[NL80211_ATTR_RESP_IE]);
 		break;
 	case NL80211_CMD_CH_SWITCH_NOTIFY:
-		mlme_event_ch_switch(drv, tb[NL80211_ATTR_WIPHY_FREQ],
-				     tb[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
+		mlme_event_ch_switch(drv,
+				     tb[NL80211_ATTR_IFINDEX],
+				     tb[NL80211_ATTR_WIPHY_FREQ],
+				     tb[NL80211_ATTR_WIPHY_CHANNEL_TYPE],
+				     tb[NL80211_ATTR_CHANNEL_WIDTH],
+				     tb[NL80211_ATTR_CENTER_FREQ1],
+				     tb[NL80211_ATTR_CENTER_FREQ2]);
 		break;
 	case NL80211_CMD_DISCONNECT:
 		mlme_event_disconnect(drv, tb[NL80211_ATTR_REASON_CODE],
@@ -10020,27 +10068,6 @@ nla_put_failure:
 }
 
 
-/* Converts nl80211_chan_width to a common format */
-static enum chan_width convert2width(int width)
-{
-	switch (width) {
-	case NL80211_CHAN_WIDTH_20_NOHT:
-		return CHAN_WIDTH_20_NOHT;
-	case NL80211_CHAN_WIDTH_20:
-		return CHAN_WIDTH_20;
-	case NL80211_CHAN_WIDTH_40:
-		return CHAN_WIDTH_40;
-	case NL80211_CHAN_WIDTH_80:
-		return CHAN_WIDTH_80;
-	case NL80211_CHAN_WIDTH_80P80:
-		return CHAN_WIDTH_80P80;
-	case NL80211_CHAN_WIDTH_160:
-		return CHAN_WIDTH_160;
-	}
-	return CHAN_WIDTH_UNKNOWN;
-}
-
-
 static int get_channel_width(struct nl_msg *msg, void *arg)
 {
 	struct nlattr *tb[NL80211_ATTR_MAX + 1];
@@ -11288,9 +11315,11 @@ static int nl80211_switch_channel(void *priv, struct csa_settings *settings)
 	struct nlattr *beacon_csa;
 	int ret = -ENOBUFS;
 
-	wpa_printf(MSG_DEBUG, "nl80211: Channel switch request (cs_count=%u block_tx=%u freq=%d)",
+	wpa_printf(MSG_DEBUG, "nl80211: Channel switch request (cs_count=%u block_tx=%u freq=%d width=%d cf1=%d cf2=%d)",
 		   settings->cs_count, settings->block_tx,
-		   settings->freq_params.freq);
+		   settings->freq_params.freq, settings->freq_params.bandwidth,
+		   settings->freq_params.center_freq1,
+		   settings->freq_params.center_freq2);
 
 	if (!drv->channel_switch_supported) {
 		wpa_printf(MSG_DEBUG, "nl80211: Driver does not support channel switch command");

wpa_supplicant/ap.c

@@ -1085,13 +1085,13 @@ int ap_ctrl_iface_chanswitch(struct wpa_supplicant *wpa_s, const char *pos)
 
 
 void wpas_ap_ch_switch(struct wpa_supplicant *wpa_s, int freq, int ht,
-		       int offset)
+		       int offset, int width, int cf1, int cf2)
 {
 	if (!wpa_s->ap_iface)
 		return;
 
 	wpa_s->assoc_freq = freq;
-	hostapd_event_ch_switch(wpa_s->ap_iface->bss[0], freq, ht, offset);
+	hostapd_event_ch_switch(wpa_s->ap_iface->bss[0], freq, ht, offset, width, cf1, cf1);
 }
 
 

wpa_supplicant/ap.h

@@ -54,7 +54,7 @@ int ap_switch_channel(struct wpa_supplicant *wpa_s,
 		      struct csa_settings *settings);
 int ap_ctrl_iface_chanswitch(struct wpa_supplicant *wpa_s, const char *txtaddr);
 void wpas_ap_ch_switch(struct wpa_supplicant *wpa_s, int freq, int ht,
-		       int offset);
+		       int offset, int width, int cf1, int cf2);
 struct wpabuf * wpas_ap_wps_nfc_config_token(struct wpa_supplicant *wpa_s,
 					     int ndef);
 #ifdef CONFIG_AP

wpa_supplicant/events.c

@@ -2891,7 +2891,10 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
 
 		wpas_ap_ch_switch(wpa_s, data->ch_switch.freq,
 				  data->ch_switch.ht_enabled,
-				  data->ch_switch.ch_offset);
+				  data->ch_switch.ch_offset,
+				  data->ch_switch.ch_width,
+				  data->ch_switch.cf1,
+				  data->ch_switch.cf2);
 		break;
 #endif /* CONFIG_AP */
 #if defined(CONFIG_AP) || defined(CONFIG_IBSS_RSN)