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/*
* hostapd / IEEE 802.11ac VHT
* Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of BSD license
*
* See README and COPYING for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "hostapd.h"
#include "ap_config.h"
#include "sta_info.h"
#include "beacon.h"
#include "ieee802_11.h"
u8 * hostapd_eid_vht_capabilities(struct hostapd_data *hapd, u8 *eid)
{
struct ieee80211_vht_capabilities *cap;
struct hostapd_hw_modes *mode = hapd->iface->current_mode;
u8 *pos = eid;
if (!mode)
return eid;
if (mode->mode == HOSTAPD_MODE_IEEE80211G && hapd->conf->vendor_vht &&
mode->vht_capab == 0 && hapd->iface->hw_features) {
int i;
for (i = 0; i < hapd->iface->num_hw_features; i++) {
if (hapd->iface->hw_features[i].mode ==
HOSTAPD_MODE_IEEE80211A) {
mode = &hapd->iface->hw_features[i];
break;
}
}
}
*pos++ = WLAN_EID_VHT_CAP;
*pos++ = sizeof(*cap);
cap = (struct ieee80211_vht_capabilities *) pos;
os_memset(cap, 0, sizeof(*cap));
cap->vht_capabilities_info = host_to_le32(
hapd->iface->conf->vht_capab);
/* Supported MCS set comes from hw */
os_memcpy(&cap->vht_supported_mcs_set, mode->vht_mcs_set, 8);
pos += sizeof(*cap);
return pos;
}
u8 * hostapd_eid_vht_operation(struct hostapd_data *hapd, u8 *eid)
{
struct ieee80211_vht_operation *oper;
u8 *pos = eid;
*pos++ = WLAN_EID_VHT_OPERATION;
*pos++ = sizeof(*oper);
oper = (struct ieee80211_vht_operation *) pos;
os_memset(oper, 0, sizeof(*oper));
/*
* center freq = 5 GHz + (5 * index)
* So index 42 gives center freq 5.210 GHz
* which is channel 42 in 5G band
*/
oper->vht_op_info_chan_center_freq_seg0_idx =
hapd->iconf->vht_oper_centr_freq_seg0_idx;
oper->vht_op_info_chan_center_freq_seg1_idx =
hapd->iconf->vht_oper_centr_freq_seg1_idx;
oper->vht_op_info_chwidth = hapd->iconf->vht_oper_chwidth;
/* VHT Basic MCS set comes from hw */
/* Hard code 1 stream, MCS0-7 is a min Basic VHT MCS rates */
oper->vht_basic_mcs_set = host_to_le16(0xfffc);
pos += sizeof(*oper);
return pos;
}
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 ||
!check_valid_vht_mcs(hapd->iface->current_mode, vht_capab)) {
sta->flags &= ~WLAN_STA_VHT;
os_free(sta->vht_capabilities);
sta->vht_capabilities = NULL;
return WLAN_STATUS_SUCCESS;
}
if (sta->vht_capabilities == NULL) {
sta->vht_capabilities =
os_zalloc(sizeof(struct ieee80211_vht_capabilities));
if (sta->vht_capabilities == NULL)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
sta->flags |= WLAN_STA_VHT;
os_memcpy(sta->vht_capabilities, vht_capab,
sizeof(struct ieee80211_vht_capabilities));
return WLAN_STATUS_SUCCESS;
}
u16 copy_sta_vendor_vht(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *ie, size_t len)
{
const u8 *vht_capab;
unsigned int vht_capab_len;
if (!ie || len < 5 + 2 + sizeof(struct ieee80211_vht_capabilities) ||
hapd->conf->disable_11ac)
goto no_capab;
/* The VHT Capabilities element embedded in vendor VHT */
vht_capab = ie + 5;
if (vht_capab[0] != WLAN_EID_VHT_CAP)
goto no_capab;
vht_capab_len = vht_capab[1];
if (vht_capab_len < sizeof(struct ieee80211_vht_capabilities) ||
(int) vht_capab_len > ie + len - vht_capab - 2)
goto no_capab;
vht_capab += 2;
if (sta->vht_capabilities == NULL) {
sta->vht_capabilities =
os_zalloc(sizeof(struct ieee80211_vht_capabilities));
if (sta->vht_capabilities == NULL)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
sta->flags |= WLAN_STA_VHT | WLAN_STA_VENDOR_VHT;
os_memcpy(sta->vht_capabilities, vht_capab,
sizeof(struct ieee80211_vht_capabilities));
return WLAN_STATUS_SUCCESS;
no_capab:
sta->flags &= ~WLAN_STA_VENDOR_VHT;
return WLAN_STATUS_SUCCESS;
}
u8 * hostapd_eid_vendor_vht(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
if (!hapd->iface->current_mode)
return eid;
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = (5 + /* The Vendor OUI, type and subtype */
2 + sizeof(struct ieee80211_vht_capabilities) +
2 + sizeof(struct ieee80211_vht_operation));
WPA_PUT_BE32(pos, (OUI_BROADCOM << 8) | VENDOR_VHT_TYPE);
pos += 4;
*pos++ = VENDOR_VHT_SUBTYPE;
pos = hostapd_eid_vht_capabilities(hapd, pos);
pos = hostapd_eid_vht_operation(hapd, pos);
return pos;
}
u16 set_sta_vht_opmode(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *vht_oper_notif)
{
if (!vht_oper_notif) {
sta->flags &= ~WLAN_STA_VHT_OPMODE_ENABLED;
return WLAN_STATUS_SUCCESS;
}
sta->flags |= WLAN_STA_VHT_OPMODE_ENABLED;
sta->vht_opmode = *vht_oper_notif;
return WLAN_STATUS_SUCCESS;
}
void hostapd_get_vht_capab(struct hostapd_data *hapd,
struct ieee80211_vht_capabilities *vht_cap,
struct ieee80211_vht_capabilities *neg_vht_cap)
{
u32 cap, own_cap, sym_caps;
if (vht_cap == NULL)
return;
os_memcpy(neg_vht_cap, vht_cap, sizeof(*neg_vht_cap));
cap = le_to_host32(neg_vht_cap->vht_capabilities_info);
own_cap = hapd->iconf->vht_capab;
/* mask out symmetric VHT capabilities we don't support */
sym_caps = VHT_CAP_SHORT_GI_80 | VHT_CAP_SHORT_GI_160;
cap &= ~sym_caps | (own_cap & sym_caps);
/* mask out beamformer/beamformee caps if not supported */
if (!(own_cap & VHT_CAP_SU_BEAMFORMER_CAPABLE))
cap &= ~(VHT_CAP_SU_BEAMFORMEE_CAPABLE |
VHT_CAP_BEAMFORMEE_STS_MAX);
if (!(own_cap & VHT_CAP_SU_BEAMFORMEE_CAPABLE))
cap &= ~(VHT_CAP_SU_BEAMFORMER_CAPABLE |
VHT_CAP_SOUNDING_DIMENSION_MAX);
if (!(own_cap & VHT_CAP_MU_BEAMFORMER_CAPABLE))
cap &= ~VHT_CAP_MU_BEAMFORMEE_CAPABLE;
if (!(own_cap & VHT_CAP_MU_BEAMFORMEE_CAPABLE))
cap &= ~VHT_CAP_MU_BEAMFORMER_CAPABLE;
/* mask channel widths we don't support */
switch (own_cap & VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
case VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
break;
case VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
if (cap & VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) {
cap &= ~VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
cap |= VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
}
break;
default:
cap &= ~VHT_CAP_SUPP_CHAN_WIDTH_MASK;
break;
}
if (!(cap & VHT_CAP_SUPP_CHAN_WIDTH_MASK))
cap &= ~VHT_CAP_SHORT_GI_160;
/*
* if we don't support RX STBC, mask out TX STBC in the STA's HT caps
* if we don't support TX STBC, mask out RX STBC in the STA's HT caps
*/
if (!(own_cap & VHT_CAP_RXSTBC_MASK))
cap &= ~VHT_CAP_TXSTBC;
if (!(own_cap & VHT_CAP_TXSTBC))
cap &= ~VHT_CAP_RXSTBC_MASK;
neg_vht_cap->vht_capabilities_info = host_to_le32(cap);
}
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