pipex_ppp_output
pipex_ppp_output(m, pxi->pxi_session, proto);
pipex_ppp_output(m, session, PPP_CCP);
pipex_ppp_output(m0, session, PPP_IP);
pipex_ppp_output(m, session_tmp, PPP_IP);
void pipex_ppp_output(struct mbuf *, struct pipex_session *,