mac80211: remove the ccmp rx pn workaround, it should no longer be necessary and it was reported to cause connection stability issues (see #9646)

SVN-Revision: 27764

package/mac80211/patches/420-mac80211_ignore_invalid_ccmp_rx_pn.patch

@@ -1,46 +0,0 @@
---- a/net/mac80211/key.h
-+++ b/net/mac80211/key.h
-@@ -90,6 +90,7 @@ struct ieee80211_key {
- 			 * Management frames.
- 			 */
- 			u8 rx_pn[NUM_RX_DATA_QUEUES + 1][6];
-+			u8 rx_invalid_pn[NUM_RX_DATA_QUEUES + 1];
- 			struct crypto_cipher *tfm;
- 			u32 replays; /* dot11RSNAStatsCCMPReplays */
- #ifndef AES_BLOCK_LEN
---- a/net/mac80211/wpa.c
-+++ b/net/mac80211/wpa.c
-@@ -457,6 +457,13 @@ ieee80211_crypto_ccmp_encrypt(struct iee
- 	return TX_CONTINUE;
- }
- 
-+static inline u64 pn_to_u64(u8 *data)
-+{
-+	u64 pn = get_unaligned_be32(data + 2);
-+	pn |= ((u64) get_unaligned_be16(data)) << 32;
-+	return pn;
-+}
-+
- 
- ieee80211_rx_result
- ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
-@@ -469,6 +476,7 @@ ieee80211_crypto_ccmp_decrypt(struct iee
- 	u8 pn[CCMP_PN_LEN];
- 	int data_len;
- 	int queue;
-+	u64 diff;
- 
- 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
- 
-@@ -503,6 +511,11 @@ ieee80211_crypto_ccmp_decrypt(struct iee
- 			return RX_DROP_UNUSABLE;
- 	}
- 
-+	diff = pn_to_u64(pn) - pn_to_u64(key->u.ccmp.rx_pn[queue]);
-+	if (diff > 1000 && key->u.ccmp.rx_invalid_pn[queue]++ < 10)
-+		return RX_DROP_UNUSABLE;
-+
-+	key->u.ccmp.rx_invalid_pn[queue] = 0;
- 	memcpy(key->u.ccmp.rx_pn[queue], pn, CCMP_PN_LEN);
- 
- 	/* Remove CCMP header and MIC */