6 GHz: Change 6 GHz channels per IEEE P802.11ax/D6.1

The channel numbering/center frequencies was changed in IEEE
P802.11ax/D6.1. The center frequencies of the channels were shifted by
10 MHz. Also, a new operating class 136 was defined with a single
channel 2. Add required support to change the channelization as per IEEE
P802.11ax/D6.1.

Signed-off-by: Wu Gao<wugao@codeaurora.org>
Signed-off-by: Vamsi Krishna <vamsin@codeaurora.org>

hostapd/hostapd.conf

@@ -210,7 +210,7 @@ channel=1
 # Frequency list can be provided as range using hyphen ('-') or individual
 # frequencies can be specified by comma (',') separated values
 # Default: all frequencies allowed in selected hw_mode
-#freqlist=2437,5945,5965
+#freqlist=2437,5955,5975
 #freqlist=2437,5985-6105
 
 # Exclude DFS channels from ACS
@@ -822,11 +822,11 @@ wmm_ac_vo_acm=0
 #he_rts_threshold=0
 
 # HE operating channel information; see matching vht_* parameters for details.
-# On the 6 GHz band the center freq calculation starts from 5.940 GHz offset.
-# For example idx=3 would result in 5955 MHz center frequency. In addition,
+# On the 6 GHz band the center freq calculation starts from 5.950 GHz offset.
+# For example idx=3 would result in 5965 MHz center frequency. In addition,
 # he_oper_chwidth is ignored, and the channel width is derived from the
 # configured operating class or center frequency indexes (see
-# IEEE P802.11ax/D4.3 Annex E, Table E-4).
+# IEEE P802.11ax/D6.1 Annex E, Table E-4).
 #he_oper_chwidth
 #he_oper_centr_freq_seg0_idx
 #he_oper_centr_freq_seg1_idx

src/common/ieee802_11_common.c

@@ -1029,9 +1029,9 @@ enum hostapd_hw_mode ieee80211_freq_to_channel_ext(unsigned int freq,
 		return HOSTAPD_MODE_IEEE80211A;
 	}
 
-	if (freq > 5940 && freq <= 7105) {
+	if (freq > 5950 && freq <= 7115) {
 		int bw;
-		u8 idx = (freq - 5940) / 5;
+		u8 idx = (freq - 5950) / 5;
 
 		bw = center_idx_to_bw_6ghz(idx);
 		if (bw < 0)
@@ -1042,6 +1042,12 @@ enum hostapd_hw_mode ieee80211_freq_to_channel_ext(unsigned int freq,
 		return HOSTAPD_MODE_IEEE80211A;
 	}
 
+	if (freq == 5935) {
+		*op_class = 136;
+		*channel = (freq - 5925) / 5;
+		return HOSTAPD_MODE_IEEE80211A;
+	}
+
 	/* 56.16 GHz, channel 1..6 */
 	if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
 		if (sec_channel)
@@ -1418,7 +1424,11 @@ static int ieee80211_chan_to_freq_global(u8 op_class, u8 chan)
 	case 135: /* UHB channels, 80+80 MHz: 7, 23, 39.. */
 		if (chan < 1 || chan > 233)
 			return -1;
-		return 5940 + chan * 5;
+		return 5950 + chan * 5;
+	case 136: /* UHB channels, 20 MHz: 2 */
+		if (chan == 2)
+			return 5935;
+		return -1;
 	case 180: /* 60 GHz band, channels 1..8 */
 		if (chan < 1 || chan > 8)
 			return -1;
@@ -2208,10 +2218,13 @@ int center_idx_to_bw_6ghz(u8 idx)
 
 int is_6ghz_freq(int freq)
 {
-	if (freq < 5940 || freq > 7105)
+	if (freq < 5935 || freq > 7115)
 		return 0;
 
-	if (center_idx_to_bw_6ghz((freq - 5940) / 5) < 0)
+	if (freq == 5935)
+		return 1;
+
+	if (center_idx_to_bw_6ghz((freq - 5950) / 5) < 0)
 		return 0;
 
 	return 1;
@@ -2220,7 +2233,7 @@ int is_6ghz_freq(int freq)
 
 int is_6ghz_op_class(u8 op_class)
 {
-	return op_class >= 131 && op_class <= 135;
+	return op_class >= 131 && op_class <= 136;
 }
 
 
@@ -2228,14 +2241,14 @@ int is_6ghz_psc_frequency(int freq)
 {
 	int i;
 
-	if (!is_6ghz_freq(freq))
+	if (!is_6ghz_freq(freq) || freq == 5935)
 		return 0;
-	if ((((freq - 5940) / 5) & 0x3) != 0x1)
+	if ((((freq - 5950) / 5) & 0x3) != 0x1)
 		return 0;
 
-	i = (freq - 5940 + 55) % 80;
+	i = (freq - 5950 + 55) % 80;
 	if (i == 0)
-		i = (freq - 5940 + 55) / 80;
+		i = (freq - 5950 + 55) / 80;
 
 	if (i >= 1 && i <= 15)
 		return 1;
@@ -2471,6 +2484,8 @@ int op_class_to_bandwidth(u8 op_class)
 	case 134: /* UHB channels, 160 MHz: 15, 47, 79.. */
 	case 135: /* UHB channels, 80+80 MHz: 7, 23, 39.. */
 		return 160;
+	case 136: /* UHB channels, 20 MHz: 2 */
+		return 20;
 	case 180: /* 60 GHz band, channels 1..8 */
 		return 2160;
 	case 181: /* 60 GHz band, EDMG CB2, channels 9..15 */
@@ -2531,6 +2546,8 @@ int op_class_to_ch_width(u8 op_class)
 		return CHANWIDTH_160MHZ;
 	case 135: /* UHB channels, 80+80 MHz: 7, 23, 39.. */
 		return CHANWIDTH_80P80MHZ;
+	case 136: /* UHB channels, 20 MHz: 2 */
+		return CHANWIDTH_USE_HT;
 	case 180: /* 60 GHz band, channels 1..8 */
 		return CHANWIDTH_2160MHZ;
 	case 181: /* 60 GHz band, EDMG CB2, channels 9..15 */

wpa_supplicant/op_classes.c

@@ -22,13 +22,13 @@ static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode,
 				       unsigned int *flags)
 {
 	int i;
-	int is_6ghz = op_class >= 131 && op_class <= 135;
+	int is_6ghz = op_class >= 131 && op_class <= 136;
 
 	for (i = 0; i < mode->num_channels; i++) {
 		int chan_is_6ghz;
 
-		chan_is_6ghz = mode->channels[i].freq > 5940 &&
-			mode->channels[i].freq <= 7105;
+		chan_is_6ghz = mode->channels[i].freq >= 5935 &&
+			mode->channels[i].freq <= 7115;
 		if (is_6ghz == chan_is_6ghz && mode->channels[i].chan == chan)
 			break;
 	}