icmp6_mtu
(int)ntohl(icp->icmp6_mtu));
mtu = ntohl(icmp6->icmp6_mtu);
pf_patch_32(pd, &icmp6->icmp6_mtu, htonl(mtu));
notifymtu = ntohl(icmp6->icmp6_mtu);
u_int mtu = ntohl(icmp6->icmp6_mtu);
TCHECK(dp->icmp6_mtu);
printf("icmp6: too big %u", (u_int32_t)ntohl(dp->icmp6_mtu));