sctp_copy_mbufchain
m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);