band: add BAND_FREQ_6_GHZ

This is a new band defined in the WiFi 6E (ax) amendment. A completely
new value is needed due to channel reuse between 2.4/5 and 6GHz.

util.c needed minimal updating to prevent compile errors which will
be fixed later to actually handle this band. WSC also needed a case
added for 6GHz but the spec does not outline any RF Band value for
6GHz so the 5GHz value will be returned in this case.

src/band.c

@@ -1092,10 +1092,11 @@ static const uint8_t oper_class_jp_to_global[] = {
 	/* 128 - 130 is a 1 to 1 mapping */
 };
 
-/* Annex E, table E-4 (only 2.4GHz and 4.9 / 5GHz bands) */
+/* Annex E, table E-4 (only 2.4GHz, 4.9 / 5GHz, and 6GHz bands) */
 static const enum band_freq oper_class_to_band_global[] = {
 	[81 ... 84]   = BAND_FREQ_2_4_GHZ,
 	[104 ... 130] = BAND_FREQ_5_GHZ,
+	[131 ... 136] = BAND_FREQ_6_GHZ,
 };
 
 /* Annex E, table E-5 */

src/band.h

@@ -39,6 +39,7 @@ enum band_chandef_width {
 enum band_freq {
 	BAND_FREQ_2_4_GHZ = 0x1,
 	BAND_FREQ_5_GHZ = 0x2,
+	BAND_FREQ_6_GHZ = 0x4,
 };
 
 struct band_chandef {

src/util.c

@@ -347,6 +347,8 @@ bool scan_freq_set_add(struct scan_freq_set *freqs, uint32_t freq)
 		return true;
 	case BAND_FREQ_5_GHZ:
 		return l_uintset_put(freqs->channels_5ghz, channel);
+	case BAND_FREQ_6_GHZ:
+		return false;
 	}
 
 	return false;
@@ -366,6 +368,8 @@ bool scan_freq_set_contains(const struct scan_freq_set *freqs, uint32_t freq)
 		return freqs->channels_2ghz & (1 << (channel - 1));
 	case BAND_FREQ_5_GHZ:
 		return l_uintset_contains(freqs->channels_5ghz, channel);
+	case BAND_FREQ_6_GHZ:
+		return false;
 	}
 
 	return false;

src/wsc.c

@@ -308,6 +308,7 @@ static inline enum wsc_rf_band freq_to_rf_band(uint32_t freq)
 	case BAND_FREQ_2_4_GHZ:
 		return WSC_RF_BAND_2_4_GHZ;
 	case BAND_FREQ_5_GHZ:
+	case BAND_FREQ_6_GHZ:
 		return WSC_RF_BAND_5_0_GHZ;
 	}