PF_RUT_UID_HIGH
snl_add_msg_attr_u32(nw, PF_RUT_UID_HIGH, uid->uid[1]);
{ .type = PF_RUT_UID_HIGH, .off = _OUT(uid[1]), .cb = snl_attr_get_uint32 },
{ .type = PF_RUT_UID_HIGH, .off = _OUT(uid[1]), .cb = nlattr_get_uint32 },
nlattr_add_u32(nw, PF_RUT_UID_HIGH, u->uid[1]);