Add functions to convert channel bandwidth to an integer

This adds two utility functions to convert both operating classes and
and the chan_width enum to an integer representing the channel
bandwidth. This can then be used to compare bandwidth parameters in an
uniform manner.

Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>

src/common/ieee802_11_common.c

@@ -1699,6 +1699,27 @@ const struct oper_class_map * get_oper_class(const char *country, u8 op_class)
 }
 
 
+int oper_class_bw_to_int(const struct oper_class_map *map)
+{
+	switch (map->bw) {
+	case BW20:
+		return 20;
+	case BW40PLUS:
+	case BW40MINUS:
+		return 40;
+	case BW80:
+		return 80;
+	case BW80P80:
+	case BW160:
+		return 160;
+	case BW2160:
+		return 2160;
+	default:
+		return 0;
+	}
+}
+
+
 int ieee802_11_parse_candidate_list(const char *pos, u8 *nei_rep,
 				    size_t nei_rep_len)
 {

src/common/ieee802_11_common.h

@@ -200,6 +200,7 @@ struct country_op_class {
 u8 country_to_global_op_class(const char *country, u8 op_class);
 
 const struct oper_class_map * get_oper_class(const char *country, u8 op_class);
+int oper_class_bw_to_int(const struct oper_class_map *map);
 
 int ieee802_11_parse_candidate_list(const char *pos, u8 *nei_rep,
 				    size_t nei_rep_len);

src/drivers/driver.h

@@ -5562,6 +5562,8 @@ const char * event_to_string(enum wpa_event_type event);
 /* Convert chan_width to a string for logging and control interfaces */
 const char * channel_width_to_string(enum chan_width width);
 
+int channel_width_to_int(enum chan_width width);
+
 int ht_supported(const struct hostapd_hw_modes *mode);
 int vht_supported(const struct hostapd_hw_modes *mode);
 

src/drivers/driver_common.c

@@ -115,6 +115,25 @@ const char * channel_width_to_string(enum chan_width width)
 }
 
 
+int channel_width_to_int(enum chan_width width)
+{
+	switch (width) {
+	case CHAN_WIDTH_20_NOHT:
+	case CHAN_WIDTH_20:
+		return 20;
+	case CHAN_WIDTH_40:
+		return 40;
+	case CHAN_WIDTH_80:
+		return 80;
+	case CHAN_WIDTH_80P80:
+	case CHAN_WIDTH_160:
+		return 160;
+	default:
+		return 0;
+	}
+}
+
+
 int ht_supported(const struct hostapd_hw_modes *mode)
 {
 	if (!(mode->flags & HOSTAPD_MODE_FLAG_HT_INFO_KNOWN)) {