static void
build_dhcpv6_reply_flows_for_lrouter_port(
        struct ovn_port *op, struct lflow_table *lflows,
        struct ds *match,
        struct lflow_ref *lflow_ref)
{
    ovs_assert(op->nbrp);
    if (is_cr_port(op)) {
        return;
    }
    for (size_t i = 0; i < op->lrp_networks.n_ipv6_addrs; i++) {
        ds_clear(match);
        ds_put_format(match, "ip6.dst == %s && udp.src == 547 &&"
                      " udp.dst == 546",
                      op->lrp_networks.ipv6_addrs[i].addr_s);
        ovn_lflow_add(lflows, op->od, S_ROUTER_IN_IP_INPUT, 100,
                      ds_cstr(match),
                      "reg0 = 0; handle_dhcpv6_reply;",
                      lflow_ref);
    }
}