M_ZEROIZE
top->m_flags |= M_ZEROIZE;
m->m_ext.ext_nextref->m_flags |= M_ZEROIZE;
m->m_ext.ext_prevref->m_flags |= M_ZEROIZE;
m->m_flags &= (M_EXT|M_PKTHDR|M_EOR|M_EXTWR|M_ZEROIZE);
if (m->m_flags & M_ZEROIZE) {
n->m_flags |= M_ZEROIZE;
top->m_flags |= M_ZEROIZE;
(*packet)->m_flags |= M_ZEROIZE;
M_AUTH|M_LOOP|M_TUNNEL|M_LINK0|M_VLANTAG|M_ZEROIZE)