nat64_icmp_reflect
nat64_icmp_reflect(m, ICMP_TIMXCEED,
nat64_icmp_reflect(m, ICMP_PARAMPROB,
nat64_icmp_reflect(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0,
nat64_icmp_reflect(m, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,
nat64_icmp_reflect(m, type, code, (uint16_t)mtu, &cfg->stats,