m_common_hash_gethdr
ports = m_common_hash_gethdr(m,
ip6 = m_common_hash_gethdr(m, off, sizeof(*ip6), &buf);
vlan = m_common_hash_gethdr(m, off, sizeof(*vlan), &buf);
ip = m_common_hash_gethdr(m, off, sizeof(*ip), &buf);