M_EOR
(M_PKTHDR|M_EOR|M_RDONLY|M_BCAST|M_MCAST|M_PROMISC|M_VLANTAG| \
flags &= (M_PKTHDR | M_EOR);
if (flags & M_EOR)
mtail->m_flags |= M_EOR; /* Only valid on the last mbuf. */
mtail->m_flags &= ~M_EOR;