IPH_ECN_ECT0
((struct ip *)(iph))->ip_tos |= IPH_ECN_ECT0; \
((ipha_t *)(iph))->ipha_type_of_service |= IPH_ECN_ECT0; \
((ip6_t *)(iph))->ip6_vcf |= htonl(IPH_ECN_ECT0 << 20); \