libnl: add nla_put_u64_64bit() helper

With this function, nla_data() is aligned on a 64-bit area.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/netlink.h

@@ -857,6 +857,19 @@ static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value)
 	return nla_put(skb, attrtype, sizeof(u64), &value);
 }
 
+/**
+ * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it
+ * @skb: socket buffer to add attribute to
+ * @attrtype: attribute type
+ * @value: numeric value
+ * @padattr: attribute type for the padding
+ */
+static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype,
+				    u64 value, int padattr)
+{
+	return nla_put_64bit(skb, attrtype, sizeof(u64), &value, padattr);
+}
+
 /**
  * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it
  * @skb: socket buffer to add attribute to