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AP: Add support for BSS load element (STA Count, Channel Utilization)

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The new "bss_load_update_period" parameter can be used to configure
hostapd to advertise its BSS Load element in Beacon and Probe Response
frames. This parameter is in the units of BUs (Beacon Units).

When enabled, the STA Count and the Channel Utilization value will be
updated periodically in the BSS Load element. The AAC is set to 0 sinze
explicit admission control is not supported. Channel Utilization is
calculated based on the channel survey information from the driver and
as such, requires a driver that supports providing that information for
the current operating channel.

Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>
This commit is contained in:
Kyeyoon Park 2014-10-15 16:36:04 -07:00 • committed by Jouni Malinen
parent 8a5cc2fe38
commit ec8f36afca
13 changed files with 171 additions and 2 deletions
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15
src/ap/beacon.c
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@ -34,16 +34,27 @@
static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
{
if (len < 2 + 5)
return eid;
#ifdef CONFIG_TESTING_OPTIONS
if (hapd->conf->bss_load_test_set) {
if (2 + 5 > len)
return eid;
*eid++ = WLAN_EID_BSS_LOAD;
*eid++ = 5;
os_memcpy(eid, hapd->conf->bss_load_test, 5);
eid += 5;
return eid;
}
#endif /* CONFIG_TESTING_OPTIONS */
if (hapd->conf->bss_load_update_period) {
*eid++ = WLAN_EID_BSS_LOAD;
*eid++ = 5;
WPA_PUT_LE16(eid, hapd->num_sta);
eid += 2;
*eid++ = hapd->iface->channel_utilization;
WPA_PUT_LE16(eid, 0); /* no available admission capabity */
eid += 2;
}
return eid;
}