ICMP6ERR_IPICMPHLEN
ip6->ip6_plen = ICMP6ERR_IPICMPHLEN;
minicmpsz = ICMP6ERR_IPICMPHLEN - sizeof(ip6_t);
if (fin->fin_plen < ICMP6ERR_IPICMPHLEN)
if (fin->fin_plen < ICMP6ERR_IPICMPHLEN) {