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Add Wide Bandwidth Channel Switch element 

When switching to a VHT channel with width greater than 20 MHz, add Wide
Bandwidth Channel Switch element. This element is added in Beacon and
Probe Response frames inside Channel Switch Wrapper element.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
This commit is contained in:
Andrei Otcheretianski 2015-09-08 12:46:12 +03:00 committed by Jouni Malinen
parent 9438e9c785
commit 244d4d8bff
3 changed files with 57 additions and 0 deletions
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3
src/ap/beacon.c
View File

@ -347,6 +347,9 @@ static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
/* save an offset to the counter - should be last byte */
*csa_counter_off = pos - start - 1;
pos = hostapd_eid_secondary_channel(hapd, pos);
#ifdef CONFIG_IEEE80211AC
pos = hostapd_eid_wb_chsw_wrapper(hapd, pos);
#endif /* CONFIG_IEEE80211AC */
}
return pos;

2
src/ap/ieee802_11.h
View File

@ -52,6 +52,8 @@ u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid);
u8 * hostapd_eid_vht_capabilities(struct hostapd_data *hapd, u8 *eid);
u8 * hostapd_eid_vht_operation(struct hostapd_data *hapd, u8 *eid);
u8 * hostapd_eid_vendor_vht(struct hostapd_data *hapd, u8 *eid);
u8 * hostapd_eid_wb_chsw_wrapper(struct hostapd_data *hapd, u8 *eid);
int hostapd_ht_operation_update(struct hostapd_iface *iface);
void ieee802_11_send_sa_query_req(struct hostapd_data *hapd,
const u8 *addr, const u8 *trans_id);

52
src/ap/ieee802_11_vht.c
View File

@ -131,6 +131,58 @@ static int check_valid_vht_mcs(struct hostapd_hw_modes *mode,
}
u8 * hostapd_eid_wb_chsw_wrapper(struct hostapd_data *hapd, u8 *eid)
{
u8 bw, chan1, chan2 = 0;
int freq1;
if (!hapd->cs_freq_params.vht_enabled)
return eid;
/* bandwidth: 0: 40, 1: 80, 2: 160, 3: 80+80 */
switch (hapd->cs_freq_params.bandwidth) {
case 40:
bw = 0;
break;
case 80:
/* check if it's 80+80 */
if (!hapd->cs_freq_params.center_freq2)
bw = 1;
else
bw = 3;
break;
case 160:
bw = 2;
break;
default:
/* not valid VHT bandwidth or not in CSA */
return eid;
}
freq1 = hapd->cs_freq_params.center_freq1 ?
hapd->cs_freq_params.center_freq1 :
hapd->cs_freq_params.freq;
if (ieee80211_freq_to_chan(freq1, &chan1) !=
HOSTAPD_MODE_IEEE80211A)
return eid;
if (hapd->cs_freq_params.center_freq2 &&
ieee80211_freq_to_chan(hapd->cs_freq_params.center_freq2,
&chan2) != HOSTAPD_MODE_IEEE80211A)
return eid;
*eid++ = WLAN_EID_VHT_CHANNEL_SWITCH_WRAPPER;
*eid++ = 5; /* Length of Channel Switch Wrapper */
*eid++ = WLAN_EID_VHT_WIDE_BW_CHSWITCH;
*eid++ = 3; /* Length of Wide Bandwidth Channel Switch element */
*eid++ = bw; /* New Channel Width */
*eid++ = chan1; /* New Channel Center Frequency Segment 0 */
*eid++ = chan2; /* New Channel Center Frequency Segment 1 */
return eid;
}
u16 copy_sta_vht_capab(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *vht_capab)
{