1 files changed, 211 insertions, 1 deletions

diff --git a/net/mac80211/vht.c b/net/mac80211/vht.c
index a2c2258bc84e..171344d4eb7c 100644
--- a/net/mac80211/vht.c
+++ b/net/mac80211/vht.c
@@ -13,6 +13,104 @@
 #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,
@@ -20,6 +118,8 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
                                     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;
 
         memset(vht_cap, 0, sizeof(*vht_cap));
 
@@ -35,12 +135,122 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
 
         vht_cap->vht_supported = true;
 
-        vht_cap->cap = le32_to_cpu(vht_cap_ie->vht_cap_info);
+        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_BEAMFORMER_ANTENNAS_MAX |
+                                 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MAX);
+        }
+
+        if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
+                vht_cap->cap |= cap_info &
+                                IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
+
+        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: