PULLUP_HDR(m_head, ehlen + sizeof(*ip6));
ip6 = mtodo(m_head, ehlen);
if (ip6->ip6_nxt != IPPROTO_TCP) {
if (ip6->ip6_nxt != IPPROTO_TCP && ip6->ip6_nxt != IPPROTO_UDP) {
m_freem(m_head);
return (NULL);
}