m_copyup
mc2 = m_copyup(mc2, i, ETHER_ALIGN);
mc = m_copyup(mc, i, ETHER_ALIGN);
if ((m = m_copyup(m, sizeof(struct ip),
if ((m = m_copyup(m, sizeof(struct ip6_hdr),
struct mbuf *m_copyup(struct mbuf *, int, int);