IFLA_GENEVE_ID
{ .type = IFLA_GENEVE_ID, .off = _OUT(ifla_vni), .cb = snl_attr_get_uint32 },
snl_add_msg_attr_u32(&nw, IFLA_GENEVE_ID, val);
if (error == 0 && nl_has_attr(&bm, IFLA_GENEVE_ID))
nlattr_add_u32(nw, IFLA_GENEVE_ID, sc->gnv_vni);
{ .type = IFLA_GENEVE_ID, .off = _OUT(ifla_vni), .cb = nlattr_get_uint32 },