sctp_m_copym
dmbuf = sctp_m_copym(*m,
mm->m_next = sctp_m_copym(m, *offset,
copy_init = sctp_m_copym(init, init_offset, M_COPYALL, M_DONTWAIT);
copy_initack = sctp_m_copym(initack, initack_offset, M_COPYALL,
appendchain = sctp_m_copym(clonechain, 0, M_COPYALL, M_DONTWAIT);
cookie = sctp_m_copym(m, at, plen, M_DONTWAIT);
outchain = sctp_m_copym(m, offset, chk_length, M_DONTWAIT);