addattr32
int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
addattr32(&req.n, sizeof(req), TCA_INGRESS_BLOCK, 1);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_POLICY, policy);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_PEER_POLICY, peer_policy);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_SCRUB, scrub);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_PEER_SCRUB, peer_scrub);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_MODE, mode);
addattr32(&req.n, sizeof(req), IFLA_NETKIT_MODE, mode);