PPTP_SEQ_DIFF
if ((u_int32_t)PPTP_SEQ_DIFF(priv->xmitSeq, priv->recvAck)
if (PPTP_SEQ_DIFF(ack, priv->xmitSeq) > 0) {
if (PPTP_SEQ_DIFF(ack, priv->recvAck) <= 0)
if (PPTP_SEQ_DIFF(ack, a->winAck) >= 0
if (PPTP_SEQ_DIFF(seq, priv->recvSeq) <= 0) {
if ((u_int32_t)PPTP_SEQ_DIFF(hpriv->xmitSeq,
if (PPTP_SEQ_DIFF(ack, hpriv->xmitSeq) > 0) {
if (PPTP_SEQ_DIFF(ack, hpriv->recvAck) <= 0)
if (PPTP_SEQ_DIFF(ack, hpriv->winAck) >= 0
if (PPTP_SEQ_DIFF(seq, hpriv->recvSeq) <= 0) {