ath9k: Setup MFP options for CCMP
Configure hardware CCMP for management frame protection and use
software crypto when needed.
Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/ath9k.h b/drivers/net/wireless/ath9k/ath9k.h
index f2ad625..3817645 100644
--- a/drivers/net/wireless/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath9k/ath9k.h
@@ -809,6 +809,8 @@
#ifndef ATH_NF_PER_CHAN
struct ath9k_nfcal_hist nfCalHist[NUM_NF_READINGS];
#endif
+
+ bool sw_mgmt_crypto;
};
struct chan_centers {
diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index 3c026e6..e9a3951 100644
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -2265,6 +2265,23 @@
if (r)
return r;
+ /* Setup MFP options for CCMP */
+ if (AR_SREV_9280_20_OR_LATER(ah)) {
+ /* Mask Retry(b11), PwrMgt(b12), MoreData(b13) to 0 in mgmt
+ * frames when constructing CCMP AAD. */
+ REG_RMW_FIELD(ah, AR_AES_MUTE_MASK1, AR_AES_MUTE_MASK1_FC_MGMT,
+ 0xc7ff);
+ ah->sw_mgmt_crypto = false;
+ } else if (AR_SREV_9160_10_OR_LATER(ah)) {
+ /* Disable hardware crypto for management frames */
+ REG_CLR_BIT(ah, AR_PCU_MISC_MODE2,
+ AR_PCU_MISC_MODE2_MGMT_CRYPTO_ENABLE);
+ REG_SET_BIT(ah, AR_PCU_MISC_MODE2,
+ AR_PCU_MISC_MODE2_NO_CRYPTO_FOR_NON_DATA_PKT);
+ ah->sw_mgmt_crypto = true;
+ } else
+ ah->sw_mgmt_crypto = true;
+
if (IS_CHAN_OFDM(chan) || IS_CHAN_HT(chan))
ath9k_hw_set_delta_slope(ah, chan);
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index fc4439f..72f2956 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -1557,6 +1557,9 @@
IEEE80211_HW_SIGNAL_DBM |
IEEE80211_HW_AMPDU_AGGREGATION;
+ if (AR_SREV_9160_10_OR_LATER(sc->sc_ah))
+ hw->flags |= IEEE80211_HW_MFP_CAPABLE;
+
hw->wiphy->interface_modes =
BIT(NL80211_IFTYPE_AP) |
BIT(NL80211_IFTYPE_STATION) |
@@ -2348,6 +2351,8 @@
key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
if (key->alg == ALG_TKIP)
key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
+ if (sc->sc_ah->sw_mgmt_crypto && key->alg == ALG_CCMP)
+ key->flags |= IEEE80211_KEY_FLAG_SW_MGMT;
ret = 0;
}
break;
diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index 462e08c..dbf24be 100644
--- a/drivers/net/wireless/ath9k/recv.c
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -593,6 +593,12 @@
if (test_bit(keyix, sc->sc_keymap))
rx_status.flag |= RX_FLAG_DECRYPTED;
}
+ if (ah->sw_mgmt_crypto &&
+ (rx_status.flag & RX_FLAG_DECRYPTED) &&
+ ieee80211_is_mgmt(hdr->frame_control)) {
+ /* Use software decrypt for management frames. */
+ rx_status.flag &= ~RX_FLAG_DECRYPTED;
+ }
/* Send the frame to mac80211 */
__ieee80211_rx(sc->hw, skb, &rx_status);
diff --git a/drivers/net/wireless/ath9k/reg.h b/drivers/net/wireless/ath9k/reg.h
index 9a61522..2dffe37 100644
--- a/drivers/net/wireless/ath9k/reg.h
+++ b/drivers/net/wireless/ath9k/reg.h
@@ -1253,6 +1253,8 @@
#define AR_AES_MUTE_MASK1 0x8060
#define AR_AES_MUTE_MASK1_SEQ 0x0000FFFF
+#define AR_AES_MUTE_MASK1_FC_MGMT 0xFFFF0000
+#define AR_AES_MUTE_MASK1_FC_MGMT_S 16
#define AR_GATED_CLKS 0x8064
#define AR_GATED_CLKS_TX 0x00000002
@@ -1477,6 +1479,10 @@
#define AR_PCU_TXBUF_CTRL_USABLE_SIZE 0x700
#define AR_9285_PCU_TXBUF_CTRL_USABLE_SIZE 0x380
+#define AR_PCU_MISC_MODE2 0x8344
+#define AR_PCU_MISC_MODE2_MGMT_CRYPTO_ENABLE 0x00000002
+#define AR_PCU_MISC_MODE2_NO_CRYPTO_FOR_NON_DATA_PKT 0x00000004
+
#define AR_KEYTABLE_0 0x8800
#define AR_KEYTABLE(_n) (AR_KEYTABLE_0 + ((_n)*32))
#define AR_KEY_CACHE_SIZE 128