ppp_tx_cp
ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq,
ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data);
ppp_tx_cp(dev, pid, code, id, len, data);
ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL);
ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL);
ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data);
ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ,
ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY,
ppp_tx_cp(proto->dev, PID_LCP, LCP_ECHO_REQ,