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hostapd: Disable VHT caps for STAs when no valid VHT MCS found

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Disable VHT caps for STAs for which there is not even a single
allowed MCS in any supported number of streams. i.e STA is
advertising 3 (not supported) as VHT MCS rates for all supported
streams.

Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
This commit is contained in:
Rajkumar Manoharan 2015-02-28 14:37:31 +05:30 committed by Jouni Malinen
parent 70fd8287eb
commit d988ff76bf
1 changed files with 43 additions and 1 deletions
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44
src/ap/ieee802_11_vht.c
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@ -90,13 +90,55 @@ u8 * hostapd_eid_vht_operation(struct hostapd_data *hapd, u8 *eid)
}
static int check_valid_vht_mcs(struct hostapd_hw_modes *mode,
const u8 *sta_vht_capab)
{
const struct ieee80211_vht_capabilities *vht_cap;
struct ieee80211_vht_capabilities ap_vht_cap;
u16 sta_rx_mcs_set, ap_tx_mcs_set;
int i;
if (!mode)
return 1;
/*
* Disable VHT caps for STAs for which there is not even a single
* allowed MCS in any supported number of streams, i.e., STA is
* advertising 3 (not supported) as VHT MCS rates for all supported
* stream cases.
*/
os_memcpy(&ap_vht_cap.vht_supported_mcs_set, mode->vht_mcs_set,
sizeof(ap_vht_cap.vht_supported_mcs_set));
vht_cap = (const struct ieee80211_vht_capabilities *) sta_vht_capab;
/* AP Tx MCS map vs. STA Rx MCS map */
sta_rx_mcs_set = le_to_host16(vht_cap->vht_supported_mcs_set.rx_map);
ap_tx_mcs_set = le_to_host16(ap_vht_cap.vht_supported_mcs_set.tx_map);
for (i = 0; i < VHT_RX_NSS_MAX_STREAMS; i++) {
if ((ap_tx_mcs_set & (0x3 << (i * 2))) == 3)
continue;
if ((sta_rx_mcs_set & (0x3 << (i * 2))) == 3)
continue;
return 1;
}
wpa_printf(MSG_DEBUG,
"No matching VHT MCS found between AP TX and STA RX");
return 0;
}
u16 copy_sta_vht_capab(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *vht_capab, size_t vht_capab_len)
{
/* Disable VHT caps for STAs associated to no-VHT BSSes. */
if (!vht_capab ||
vht_capab_len < sizeof(struct ieee80211_vht_capabilities) ||
hapd->conf->disable_11ac) {
hapd->conf->disable_11ac ||
!check_valid_vht_mcs(hapd->iface->current_mode, vht_capab)) {
sta->flags &= ~WLAN_STA_VHT;
os_free(sta->vht_capabilities);
sta->vht_capabilities = NULL;