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Update Wide Bandwidth Channel Switch element

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Update Wide Bandwidth Channel Switch element as per IEEE
P802.11-REVme/D4.0, 9.4.2.159 (Wide Bandwidth Channel Switch element)
and Table 9-314 (VHT Operation Information subfields).

Update New Channel Width, New Channel Center Frequency Segment 0, and
New Channel Center Frequency Segment 1 fields as per IEEE
P802.11-REVme/D4.0 for 160 MHz and 80+80 MHz bandwidth. This replaces
the use of now deprecated Channel Width 2 and 3 values with a more
backwards compatible design.

Signed-off-by: Yuvarani V <quic_yuvarani@quicinc.com>
This commit is contained in:
Yuvarani V 2023-09-27 12:52:03 +05:30 • committed by Jouni Malinen
parent c4c5c991da
commit ef8d48c4cf
1 changed files with 20 additions and 8 deletions
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28
src/ap/ieee802_11.c
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@ -7055,7 +7055,7 @@ u8 * hostapd_eid_txpower_envelope(struct hostapd_data *hapd, u8 *eid)
u8 * hostapd_eid_wb_chsw_wrapper(struct hostapd_data *hapd, u8 *eid) u8 * hostapd_eid_wb_chsw_wrapper(struct hostapd_data *hapd, u8 *eid)
{ {
u8 bw, chan1, chan2 = 0; u8 bw, chan1 = 0, chan2 = 0;
int freq1; int freq1;
if (!hapd->cs_freq_params.channel || if (!hapd->cs_freq_params.channel ||
@ -7064,20 +7064,17 @@ u8 * hostapd_eid_wb_chsw_wrapper(struct hostapd_data *hapd, u8 *eid)
!hapd->cs_freq_params.eht_enabled)) !hapd->cs_freq_params.eht_enabled))
return eid; return eid;
/* bandwidth: 0: 40, 1: 80, 2: 160, 3: 80+80, 4: 320 */ /* bandwidth: 0: 40, 1: 80, 160, 80+80, 4: 320 as per
* IEEE P802.11-REVme/D4.0, 9.4.2.159 and Table 9-314. */
switch (hapd->cs_freq_params.bandwidth) { switch (hapd->cs_freq_params.bandwidth) {
case 40: case 40:
bw = 0; bw = 0;
break; break;
case 80: case 80:
/* check if it's 80+80 */ bw = 1;
if (!hapd->cs_freq_params.center_freq2)
bw = 1;
else
bw = 3;
break; break;
case 160: case 160:
bw = 2; bw = 1;
break; break;
case 320: case 320:
bw = 4; bw = 4;
@ -7104,6 +7101,21 @@ u8 * hostapd_eid_wb_chsw_wrapper(struct hostapd_data *hapd, u8 *eid)
*eid++ = WLAN_EID_WIDE_BW_CHSWITCH; *eid++ = WLAN_EID_WIDE_BW_CHSWITCH;
*eid++ = 3; /* Length of Wide Bandwidth Channel Switch element */ *eid++ = 3; /* Length of Wide Bandwidth Channel Switch element */
*eid++ = bw; /* New Channel Width */ *eid++ = bw; /* New Channel Width */
if (hapd->cs_freq_params.bandwidth == 160) {
/* Update the CCFS0 and CCFS1 values in the element based on
* IEEE P802.11-REVme/D4.0, Table 9-314 */
/* CCFS1 - The channel center frequency index of the 160 MHz
* channel. */
chan2 = chan1;
/* CCFS0 - The channel center frequency index of the 80 MHz
* channel segment that contains the primary channel. */
if (hapd->cs_freq_params.channel < chan1)
chan1 -= 8;
else
chan1 += 8;
}
*eid++ = chan1; /* New Channel Center Frequency Segment 0 */ *eid++ = chan1; /* New Channel Center Frequency Segment 0 */
*eid++ = chan2; /* New Channel Center Frequency Segment 1 */ *eid++ = chan2; /* New Channel Center Frequency Segment 1 */