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mt76: fix transmission of encrypted management frames

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Hardware encryption seems to break encrypted unicast mgmt tx.
Unfortunately the hardware TXWI header does not have a bit to indicate
that a frame is software encrypted, so sw-encrypted frames need to use a
different WCID. For that to work, the CCMP PN needs to be generated in
software, which makes things a bit slower, so only do it for keys that
also need to tx management frames.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Felix Fietkau 2018-01-18 19:01:43 +01:00 committed by Kalle Valo
parent 1cbbf69cc8
commit 2340523646
4 changed files with 28 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/mediatek/mt76/mt76.h
View File

@ -129,6 +129,7 @@ struct mt76_wcid {
bool tx_rate_set;
u8 tx_rate_nss;
s8 max_txpwr_adj;
bool sw_iv;
};
struct mt76_txq {

16
drivers/net/wireless/mediatek/mt76/mt76x2_mac.c
View File

@ -171,10 +171,12 @@ void mt76x2_mac_write_txwi(struct mt76x2_dev *dev, struct mt76x2_txwi *txwi,
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_tx_rate *rate = &info->control.rates[0];
struct ieee80211_key_conf *key = info->control.hw_key;
u16 rate_ht_mask = FIELD_PREP(MT_RXWI_RATE_PHY, BIT(1) | BIT(2));
u16 txwi_flags = 0;
u8 nss;
s8 txpwr_adj, max_txpwr_adj;
u8 ccmp_pn[8];
memset(txwi, 0, sizeof(*txwi));
@ -185,6 +187,20 @@ void mt76x2_mac_write_txwi(struct mt76x2_dev *dev, struct mt76x2_txwi *txwi,
txwi->pktid = 1;
if (wcid && wcid->sw_iv && key) {
u64 pn = atomic64_inc_return(&key->tx_pn);
ccmp_pn[0] = pn;
ccmp_pn[1] = pn >> 8;
ccmp_pn[2] = 0;
ccmp_pn[3] = 0x20 | (key->keyidx << 6);
ccmp_pn[4] = pn >> 16;
ccmp_pn[5] = pn >> 24;
ccmp_pn[6] = pn >> 32;
ccmp_pn[7] = pn >> 40;
txwi->iv = *((u32 *) &ccmp_pn[0]);
txwi->eiv = *((u32 *) &ccmp_pn[1]);
}
spin_lock_bh(&dev->mt76.lock);
if (wcid && (rate->idx < 0 || !rate->count)) {
txwi->rate = wcid->tx_rate;

8
drivers/net/wireless/mediatek/mt76/mt76x2_main.c
View File

@ -355,9 +355,15 @@ mt76x2_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
if (cmd == SET_KEY) {
key->hw_key_idx = wcid->idx;
wcid->hw_key_idx = idx;
if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
key->flags |= IEEE80211_KEY_FLAG_SW_MGMT_TX;
wcid->sw_iv = true;
}
} else {
if (idx == wcid->hw_key_idx)
if (idx == wcid->hw_key_idx) {
wcid->hw_key_idx = -1;
wcid->sw_iv = true;
}
key = NULL;
}

6
drivers/net/wireless/mediatek/mt76/mt76x2_tx.c
View File

@ -36,7 +36,9 @@ void mt76x2_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control,
msta = (struct mt76x2_sta *) control->sta->drv_priv;
wcid = &msta->wcid;
} else if (vif) {
}
if (vif || (!info->control.hw_key && wcid->hw_key_idx != -1)) {
struct mt76x2_vif *mvif;
mvif = (struct mt76x2_vif *) vif->drv_priv;
@ -166,7 +168,7 @@ int mt76x2_tx_prepare_skb(struct mt76_dev *mdev, void *txwi,
*tx_info = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
MT_TXD_INFO_80211;
if (!wcid || wcid->hw_key_idx == 0xff)
if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv)
*tx_info |= MT_TXD_INFO_WIV;
return 0;