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linux/net/mac80211/vht.c
Arik Nemtsov 52a45f38ca mac80211: avoid VHT usage with no 80MHz chans allowed 
Currently if 80MHz channels are not allowed for use, the VHT IE is not
included in the probe request for an AP. This is not good enough if the
AP is configured with the wrong regulatory and supports VHT even where
prohibited or in TDLS scenarios.
Mark the ifmgd with the DISABLE_VHT flag for the misbehaving-AP case, and
unset VHT support from the peer-station entry for the TDLS case.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-09-04 14:31:41 +02:00

470 lines
14 KiB
C
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/*
* VHT handling
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/ieee80211.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "rate.h"
static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta_vht_cap *vht_cap,
u32 flag)
{
__le32 le_flag = cpu_to_le32(flag);
if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
!(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
vht_cap->cap &= ~flag;
}
void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta_vht_cap *vht_cap)
{
int i;
u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;
if (!vht_cap->vht_supported)
return;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return;
__check_vhtcap_disable(sdata, vht_cap,
IEEE80211_VHT_CAP_RXLDPC);
__check_vhtcap_disable(sdata, vht_cap,
IEEE80211_VHT_CAP_SHORT_GI_80);
__check_vhtcap_disable(sdata, vht_cap,
IEEE80211_VHT_CAP_SHORT_GI_160);
__check_vhtcap_disable(sdata, vht_cap,
IEEE80211_VHT_CAP_TXSTBC);
__check_vhtcap_disable(sdata, vht_cap,
IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
__check_vhtcap_disable(sdata, vht_cap,
IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
__check_vhtcap_disable(sdata, vht_cap,
IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
__check_vhtcap_disable(sdata, vht_cap,
IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);
/* Allow user to decrease AMPDU length exponent */
if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
u32 cap, n;
n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
if (n < cap) {
vht_cap->cap &=
~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
vht_cap->cap |=
n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
}
}
/* Allow the user to decrease MCSes */
rxmcs_mask =
le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
rxmcs_n &= rxmcs_mask;
rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
txmcs_mask =
le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
txmcs_n &= txmcs_mask;
txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
for (i = 0; i < 8; i++) {
u8 m, n, c;
m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
rxmcs_cap &= ~(3 << 2*i);
rxmcs_cap |= (rxmcs_n & (3 << 2*i));
}
m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
txmcs_cap &= ~(3 << 2*i);
txmcs_cap |= (txmcs_n & (3 << 2*i));
}
}
vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
}
void
ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
struct ieee80211_supported_band *sband,
const struct ieee80211_vht_cap *vht_cap_ie,
struct sta_info *sta)
{
struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
struct ieee80211_sta_vht_cap own_cap;
u32 cap_info, i;
bool have_80mhz;
memset(vht_cap, 0, sizeof(*vht_cap));
if (!sta->sta.ht_cap.ht_supported)
return;
if (!vht_cap_ie || !sband->vht_cap.vht_supported)
return;
/* Allow VHT if at least one channel on the sband supports 80 MHz */
have_80mhz = false;
for (i = 0; i < sband->n_channels; i++) {
if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
IEEE80211_CHAN_NO_80MHZ))
continue;
have_80mhz = true;
break;
}
if (!have_80mhz)
return;
/*
* A VHT STA must support 40 MHz, but if we verify that here
* then we break a few things - some APs (e.g. Netgear R6300v2
* and others based on the BCM4360 chipset) will unset this
* capability bit when operating in 20 MHz.
*/
vht_cap->vht_supported = true;
own_cap = sband->vht_cap;
/*
* If user has specified capability overrides, take care
* of that if the station we're setting up is the AP that
* we advertised a restricted capability set to. Override
* our own capabilities and then use those below.
*/
if (sdata->vif.type == NL80211_IFTYPE_STATION &&
!test_sta_flag(sta, WLAN_STA_TDLS_PEER))
ieee80211_apply_vhtcap_overrides(sdata, &own_cap);
/* take some capabilities as-is */
cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
vht_cap->cap = cap_info;
vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 |
IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 |
IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
IEEE80211_VHT_CAP_RXLDPC |
IEEE80211_VHT_CAP_VHT_TXOP_PS |
IEEE80211_VHT_CAP_HTC_VHT |
IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB |
IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB |
IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;
/* and some based on our own capabilities */
switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
vht_cap->cap |= cap_info &
IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
break;
case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
vht_cap->cap |= cap_info &
IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
break;
default:
/* nothing */
break;
}
/* symmetric capabilities */
vht_cap->cap |= cap_info & own_cap.cap &
(IEEE80211_VHT_CAP_SHORT_GI_80 |
IEEE80211_VHT_CAP_SHORT_GI_160);
/* remaining ones */
if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
vht_cap->cap |= cap_info &
(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);
if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
vht_cap->cap |= cap_info &
(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);
if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
vht_cap->cap |= cap_info &
IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
vht_cap->cap |= cap_info &
IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;
if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;
if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC;
/* Copy peer MCS info, the driver might need them. */
memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
sizeof(struct ieee80211_vht_mcs_info));
/* but also restrict MCSes */
for (i = 0; i < 8; i++) {
u16 own_rx, own_tx, peer_rx, peer_tx;
own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
else if (own_rx < peer_tx)
peer_tx = own_rx;
}
if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
else if (own_tx < peer_rx)
peer_rx = own_tx;
}
vht_cap->vht_mcs.rx_mcs_map &=
~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2);
vht_cap->vht_mcs.tx_mcs_map &=
~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2);
}
/* finally set up the bandwidth */
switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
break;
default:
sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
}
sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);
}
enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta)
{
struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
u32 cap_width;
if (!vht_cap->vht_supported)
return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
IEEE80211_STA_RX_BW_40 :
IEEE80211_STA_RX_BW_20;
cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
return IEEE80211_STA_RX_BW_160;
return IEEE80211_STA_RX_BW_80;
}
static enum ieee80211_sta_rx_bandwidth
ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width)
{
switch (width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
return IEEE80211_STA_RX_BW_20;
case NL80211_CHAN_WIDTH_40:
return IEEE80211_STA_RX_BW_40;
case NL80211_CHAN_WIDTH_80:
return IEEE80211_STA_RX_BW_80;
case NL80211_CHAN_WIDTH_160:
case NL80211_CHAN_WIDTH_80P80:
return IEEE80211_STA_RX_BW_160;
default:
WARN_ON_ONCE(1);
return IEEE80211_STA_RX_BW_20;
}
}
enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
enum ieee80211_sta_rx_bandwidth bw;
enum nl80211_chan_width bss_width = sdata->vif.bss_conf.chandef.width;
bw = ieee80211_sta_cap_rx_bw(sta);
bw = min(bw, sta->cur_max_bandwidth);
/* do not cap the BW of TDLS WIDER_BW peers by the bss */
if (!test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));
return bw;
}
void ieee80211_sta_set_rx_nss(struct sta_info *sta)
{
u8 ht_rx_nss = 0, vht_rx_nss = 0;
/* if we received a notification already don't overwrite it */
if (sta->sta.rx_nss)
return;
if (sta->sta.ht_cap.ht_supported) {
if (sta->sta.ht_cap.mcs.rx_mask[0])
ht_rx_nss++;
if (sta->sta.ht_cap.mcs.rx_mask[1])
ht_rx_nss++;
if (sta->sta.ht_cap.mcs.rx_mask[2])
ht_rx_nss++;
if (sta->sta.ht_cap.mcs.rx_mask[3])
ht_rx_nss++;
/* FIXME: consider rx_highest? */
}
if (sta->sta.vht_cap.vht_supported) {
int i;
u16 rx_mcs_map;
rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map);
for (i = 7; i >= 0; i--) {
u8 mcs = (rx_mcs_map >> (2 * i)) & 3;
if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
vht_rx_nss = i + 1;
break;
}
}
/* FIXME: consider rx_highest? */
}
ht_rx_nss = max(ht_rx_nss, vht_rx_nss);
sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss);
}
u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, u8 opmode,
enum ieee80211_band band, bool nss_only)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband;
enum ieee80211_sta_rx_bandwidth new_bw;
u32 changed = 0;
u8 nss;
sband = local->hw.wiphy->bands[band];
/* ignore - no support for BF yet */
if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
return 0;
nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
nss += 1;
if (sta->sta.rx_nss != nss) {
sta->sta.rx_nss = nss;
changed |= IEEE80211_RC_NSS_CHANGED;
}
if (nss_only)
return changed;
switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
break;
case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
break;
case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
break;
case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
break;
}
new_bw = ieee80211_sta_cur_vht_bw(sta);
if (new_bw != sta->sta.bandwidth) {
sta->sta.bandwidth = new_bw;
changed |= IEEE80211_RC_BW_CHANGED;
}
return changed;
}
void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, u8 opmode,
enum ieee80211_band band, bool nss_only)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode,
band, nss_only);
if (changed > 0)
rate_control_rate_update(local, sband, sta, changed);
}
void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
u16 vht_mask[NL80211_VHT_NSS_MAX])
{
int i;
u16 mask, cap = le16_to_cpu(vht_cap);
for (i = 0; i < NL80211_VHT_NSS_MAX; i++) {
mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
switch (mask) {
case IEEE80211_VHT_MCS_SUPPORT_0_7:
vht_mask[i] = 0x00FF;
break;
case IEEE80211_VHT_MCS_SUPPORT_0_8:
vht_mask[i] = 0x01FF;
break;
case IEEE80211_VHT_MCS_SUPPORT_0_9:
vht_mask[i] = 0x03FF;
break;
case IEEE80211_VHT_MCS_NOT_SUPPORTED:
default:
vht_mask[i] = 0;
break;
}
}
}
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