ICMP6
icmp6_type = ICMP6(ulp)->icmp6_type;
ICMP6(ulp)->icmp6_type,
nat64_icmp_handle_echo(ip6, ICMP6(icmp), icmpid, type);
nat64_icmp_handle_echo(eip6, ICMP6(icmp), icmpid,
ICMP6(icmp)->icmp6_type = type;
ICMP6(icmp)->icmp6_code = code;
ICMP6(icmp)->icmp6_mtu = htonl(mtu);
ICMP6(icmp)->icmp6_cksum = 0;
ICMP6(icmp)->icmp6_cksum = cksum_add(