iwlwifi: add 1X HW WEP support

This patch adds support for HW encryption/decryption in 1X WEP.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-4965.h

@@ -461,6 +461,7 @@ struct iwl4965_tid_data {
 struct iwl4965_hw_key {
 	enum ieee80211_key_alg alg;
 	int keylen;
+	u8 keyidx;
 	struct ieee80211_key_conf *conf;
 	u8 key[32];
 };

drivers/net/wireless/iwlwifi/iwl-sta.c

@@ -35,6 +35,7 @@
 #include "iwl-sta.h"
 #include "iwl-io.h"
 #include "iwl-helpers.h"
+#include "iwl-4965.h"
 
 int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
 {
@@ -117,3 +118,49 @@ int iwl_set_default_wep_key(struct iwl_priv *priv,
 	return ret;
 }
 
+int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
+				struct ieee80211_key_conf *keyconf,
+				u8 sta_id)
+{
+	unsigned long flags;
+	__le16 key_flags = 0;
+	int ret;
+
+	keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
+	keyconf->hw_key_idx = keyconf->keyidx;
+
+	key_flags |= (STA_KEY_FLG_WEP | STA_KEY_FLG_MAP_KEY_MSK);
+	key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
+	key_flags &= ~STA_KEY_FLG_INVALID;
+
+	if (keyconf->keylen == WEP_KEY_LEN_128)
+		key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
+
+	if (sta_id == priv->hw_setting.bcast_sta_id)
+		key_flags |= STA_KEY_MULTICAST_MSK;
+
+	spin_lock_irqsave(&priv->sta_lock, flags);
+
+	priv->stations[sta_id].keyinfo.alg = keyconf->alg;
+	priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
+	priv->stations[sta_id].keyinfo.keyidx = keyconf->keyidx;
+
+	memcpy(priv->stations[sta_id].keyinfo.key,
+				keyconf->key, keyconf->keylen);
+
+	memcpy(&priv->stations[sta_id].sta.key.key[3],
+				keyconf->key, keyconf->keylen);
+
+	priv->stations[sta_id].sta.key.key_offset = sta_id % 8; /* FIXME */
+	priv->stations[sta_id].sta.key.key_flags = key_flags;
+
+	priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
+	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
+
+	ret = iwl4965_send_add_station(priv,
+		&priv->stations[sta_id].sta, CMD_ASYNC);
+
+	spin_unlock_irqrestore(&priv->sta_lock, flags);
+
+	return ret;
+}

drivers/net/wireless/iwlwifi/iwl-sta.h

@@ -42,5 +42,8 @@ int iwl_remove_default_wep_key(struct iwl_priv *priv,
 				struct ieee80211_key_conf *key);
 int iwl_set_default_wep_key(struct iwl_priv *priv,
 				struct ieee80211_key_conf *key);
+int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
+				struct ieee80211_key_conf *keyconf,
+				u8 sta_id);
 
 #endif /* __iwl_sta_h__ */

drivers/net/wireless/iwlwifi/iwl4965-base.c

@@ -1214,7 +1214,7 @@ static int iwl4965_set_dynamic_key(struct iwl_priv *priv,
 		ret = iwl4965_set_tkip_dynamic_key_info(priv, key, sta_id);
 		break;
 	case ALG_WEP:
-		ret = -EOPNOTSUPP;
+		ret = iwl_set_wep_dynamic_key_info(priv, key, sta_id);
 		break;
 	default:
 		IWL_ERROR("Unknown alg: %s alg = %d\n", __func__, key->alg);
@@ -2138,7 +2138,12 @@ static void iwl4965_build_tx_cmd_hwcrypto(struct iwl_priv *priv,
 			if (wepkey->key_size == WEP_KEY_LEN_128)
 				cmd->cmd.tx.sec_ctl |= TX_CMD_SEC_KEY128;
 		} else {
-			IWL_ERROR("No support for WEP key mappings key\n");
+			/* the WEP key was sent as dynamic */
+			keyidx = keyinfo->keyidx;
+			memcpy(&cmd->cmd.tx.key[3], keyinfo->key,
+							keyinfo->keylen);
+			if (keyinfo->keylen == WEP_KEY_LEN_128)
+				cmd->cmd.tx.sec_ctl |= TX_CMD_SEC_KEY128;
 		}
 
 		cmd->cmd.tx.sec_ctl |= (TX_CMD_SEC_WEP |