SN_SCTP_SHUTACK
if (sm->msg > SN_SCTP_SHUTACK) {
sm->msg = SN_SCTP_SHUTACK;
case SN_SCTP_SHUTACK: /* a packet containing a SHUTDOWN-ACK chunk */
case SN_SCTP_SHUTACK: /* a packet containing a SHUTDOWN-ACK chunk */
case SN_SCTP_SHUTACK: