mpls_ttl_t
mpls_push(struct mbuf **m, mpls_label_t label, mpls_s_t s, mpls_exp_t exp, mpls_ttl_t ttl) {
mpls_ttl_t ttl;
mpls_s_t, mpls_exp_t, mpls_ttl_t);
mpls_ttl_t ttl = 255;