TLV_PROTO_IPV6
#define TLV_TYPE_IPV6_REQUEST (TLV_PROTO_IPV6 | TLV_ROUTE_REQUEST)
#define TLV_TYPE_IPV6_INTERNAL (TLV_PROTO_IPV6 | TLV_ROUTE_INTERNAL)
#define TLV_TYPE_IPV6_EXTERNAL (TLV_PROTO_IPV6 | TLV_ROUTE_EXTERNAL)
#define TLV_TYPE_IPV6_COMMUNITY (TLV_PROTO_IPV6 | TLV_ROUTE_COMMUNITY)
if ((tlv_type & TLV_PROTO_MASK) == TLV_PROTO_IPV6 &&
tlv.type = TLV_PROTO_IPV6;