icmp_data
bcopy(icmph->icmp_data, &cookie, sizeof (cookie));
bcopy(icmph->icmp_data + sizeof (cookie), &port, sizeof (port));
bcopy(¶m->echo_cookie, icmph->icmp_data,
bcopy(¶m->port, icmph->icmp_data + sizeof (param->echo_cookie),
tp = (struct timeval *)&icp->icmp_data[0];
ra = (struct icmp_ra_addr *)icmp->icmp_data;
(struct ip *)icmp->icmp_data, 28);
(struct ip *)icmp->icmp_data, 28);