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>

drivers/net/wireless/ath9k/ath9k.h

@@ -809,6 +809,8 @@ struct ath_hal {
 #ifndef ATH_NF_PER_CHAN
 	struct ath9k_nfcal_hist nfCalHist[NUM_NF_READINGS];
 #endif
+
+	bool sw_mgmt_crypto;
 };
 
 struct chan_centers {

drivers/net/wireless/ath9k/hw.c

@@ -2265,6 +2265,23 @@ int ath9k_hw_reset(struct ath_hal *ah, struct ath9k_channel *chan,
 	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);
 

drivers/net/wireless/ath9k/main.c

@@ -1557,6 +1557,9 @@ static int ath_attach(u16 devid, struct ath_softc *sc)
 		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 @@ static int ath9k_set_key(struct ieee80211_hw *hw,
 			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;

drivers/net/wireless/ath9k/recv.c

@@ -593,6 +593,12 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
 			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);

drivers/net/wireless/ath9k/reg.h

@@ -1253,6 +1253,8 @@ enum {
 
 #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 @@ enum {
 #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