m_pulldown
mp = m_pulldown(m, 0, sizeof(*peer), &offp);
mp0 = m_pulldown(mp, 0, sizeof(*auth), &offp);
n = m_pulldown(m, off, sizeof(*ph), &noff);
n = m_pulldown(m, off, sizeof(*pt), &noff);
n = m_pulldown(m, off, len, &noff);
n = m_pulldown(m, off, len,
n = m_pulldown(m, off, len,
n = m_pulldown(m, off, len,
n = m_pulldown(m, off, len,
t = m_pulldown(*mp, off, len, &toff);
n = m_pulldown(m, off, sizeof(*sump), &sumoff);
struct mbuf *m_pulldown(struct mbuf *, int, int, int *);