libnl: nla_put_be64(): align on a 64-bit area

nla_data() is now aligned on a 64-bit area.

A temporary version (nla_put_be64_32bit()) is added for nla_put_net64().
This function is removed in the next patch.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/lwtunnel.h

@@ -22,6 +22,7 @@ enum lwtunnel_ip_t {
 	LWTUNNEL_IP_TTL,
 	LWTUNNEL_IP_TOS,
 	LWTUNNEL_IP_FLAGS,
+	LWTUNNEL_IP_PAD,
 	__LWTUNNEL_IP_MAX,
 };
 
@@ -35,6 +36,7 @@ enum lwtunnel_ip6_t {
 	LWTUNNEL_IP6_HOPLIMIT,
 	LWTUNNEL_IP6_TC,
 	LWTUNNEL_IP6_FLAGS,
+	LWTUNNEL_IP6_PAD,
 	__LWTUNNEL_IP6_MAX,
 };