[at76c503a-develop] [PATCH 3/3] Add WPA support for 1.103 firmware

[Milan Plzik]

Based on atmelwlandriver analysis, this patch implements support for WPA.
TKIP was tested and working, AES/CCMP needs testing on 505A or 505AMX
device.

Signed-off-by: Milan Plzik <milan.plzik at gmail.com>
---

 drivers/net/wireless/at76_usb.c |   67 ++++++++++++++++++++++++++++++++++++---
 1 files changed, 62 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/at76_usb.c b/drivers/net/wireless/at76_usb.c
index 6cfd370..eae3036 100644
--- a/drivers/net/wireless/at76_usb.c
+++ b/drivers/net/wireless/at76_usb.c
@@ -1002,6 +1002,40 @@ static int at76_add_mac_address(struct at76_priv *priv, void *addr)
 	return ret;
 }
 
+static int at76_set_tkip_bssid(struct at76_priv *priv, const void *addr)
+{
+	int ret = 0;
+
+	priv->mib_buf.type = MIB_MAC_ENCRYPTION;
+	priv->mib_buf.size = ETH_ALEN;
+	priv->mib_buf.index = offsetof(struct mib_mac_encryption, tkip_bssid);
+	memcpy(priv->mib_buf.data.addr, addr, ETH_ALEN);
+
+	ret = at76_set_mib(priv, &priv->mib_buf);
+	if (ret < 0)
+		printk(KERN_ERR "%s: set_mib (MAC_ENCRYPTION, tkip_bssid) failed: %d\n",
+		       wiphy_name(priv->hw->wiphy), ret);
+
+	return ret;
+}
+
+static int at76_reset_rsc(struct at76_priv *priv)
+{
+	int ret = 0;
+
+	priv->mib_buf.type = MIB_MAC_ENCRYPTION;
+	priv->mib_buf.size = 4 * 8;
+	priv->mib_buf.index = offsetof(struct mib_mac_encryption, key_rsc);
+	memset(priv->mib_buf.data.data, 0 , priv->mib_buf.size);
+
+	ret = at76_set_mib(priv, &priv->mib_buf);
+	if (ret < 0)
+		printk(KERN_ERR "%s: set_mib (MAC_ENCRYPTION, key_rsc) failed: %d\n",
+		       wiphy_name(priv->hw->wiphy), ret);
+
+	return ret;
+}
+
 static void at76_dump_mib_mac_addr(struct at76_priv *priv)
 {
 	int i;
@@ -1802,9 +1836,9 @@ static int at76_mac80211_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
 	tx_buffer->wlength = cpu_to_le16(skb->len);
 	tx_buffer->tx_rate = control->tx_rate->hw_value;
 	if (FIRMWARE_IS_WPA(priv->fw_version) && !(control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)) {
-		tx_buffer->key_id = (control->key_idx);
-		tx_buffer->cipher_type = priv->keys[control->key_idx].cipher;
-		tx_buffer->cipher_length = priv->keys[control->key_idx].keylen;
+		tx_buffer->key_id = (control->hw_key->keyidx);
+		tx_buffer->cipher_type = priv->keys[control->hw_key->keyidx].cipher;
+		tx_buffer->cipher_length = priv->keys[control->hw_key->keyidx].keylen;
 		tx_buffer->reserved = 0;
 	} else {
 		tx_buffer->key_id = 0;
@@ -1947,7 +1981,8 @@ static int at76_join(struct at76_priv *priv)
 		       wiphy_name(priv->hw->wiphy), ret);
 		return 0;
 	}
-
+	
+	at76_set_tkip_bssid(priv, priv->bssid);
 	at76_set_pm_mode(priv);
 
 	return 0;
@@ -2183,7 +2218,7 @@ static int at76_set_key_newfw(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 		if (at76_set_mib(priv, &priv->mib_buf) != CMD_STATUS_COMPLETE)
 			ret = -EOPNOTSUPP; /* -EIO would be probably better */
 		else {
-			ret = 0;
+
 			priv->keys[key->keyidx].cipher = CIPHER_NONE;
 			priv->keys[key->keyidx].keylen = 0;
 		};
@@ -2194,6 +2229,7 @@ static int at76_set_key_newfw(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 			priv->default_pairwise_key = 0xff;
 		/* If default pairwise key is removed, fall back to 
 		 * group key? */
+		ret = 0;
 		goto exit;
 	};
 	
@@ -2221,6 +2257,22 @@ static int at76_set_key_newfw(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 					goto exit;
 				};
 				break;
+			case ALG_TKIP:
+				key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
+				priv->keys[key->keyidx].cipher = CIPHER_TKIP;
+				priv->keys[key->keyidx].keylen = 12;
+				break;
+
+			case ALG_CCMP:
+				if (!at76_is_505a(priv->board_type)) {
+					ret = -EOPNOTSUPP;
+					goto exit;
+				};
+				key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
+				priv->keys[key->keyidx].cipher = CIPHER_CCMP;
+				priv->keys[key->keyidx].keylen = 16;
+				break;
+				
 			default:
 				ret = -EOPNOTSUPP;
 				goto exit;
@@ -2245,6 +2297,10 @@ static int at76_set_key_newfw(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 			ret = -EOPNOTSUPP; /* -EIO would be probably better */
 			goto exit;
 		};
+
+		if ((key->alg == ALG_TKIP) || (key->alg == ALG_CCMP))
+			at76_reset_rsc(priv);
+
 		key->hw_key_idx = key->keyidx;
 
 		/* Set up default keys */
@@ -2742,5 +2798,6 @@ MODULE_AUTHOR("Balint Seeber <n0_5p4m_p13453 at hotmail.com>");
 MODULE_AUTHOR("Pavel Roskin <proski at gnu.org>");
 MODULE_AUTHOR("Guido Guenther <agx at sigxcpu.org>");
 MODULE_AUTHOR("Kalle Valo <kalle.valo at iki.fi>");
+MODULE_AUTHOR("Milan Plzik <milan.plzik at gmail.com>");
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");