/**
Check the segment against PAWS.
@param[in] Tcb Pointer to the TCP_CB of this TCP instance.
@param[in] TSVal The timestamp value.
@retval 1 The segment passed the PAWS check.
@retval 0 The segment failed to pass the PAWS check.
**/
UINT32
TcpPawsOK (
IN TCP_CB *Tcb,
IN UINT32 TSVal
)
{
//
// PAWS as defined in RFC1323, buggy...
//
if (TCP_TIME_LT (TSVal, Tcb->TsRecent) &&
TCP_TIME_LT (Tcb->TsRecentAge + TCP_PAWS_24DAY, mTcpTick)
) {
return 0;
}
return 1;
}
/**
Update the timer status and the next expire time according to the timers
to expire in a specific future time slot.
@param Tcb Pointer to the TCP_CB of this TCP instance.
**/
VOID
TcpUpdateTimer (
IN OUT TCP_CB *Tcb
)
{
UINT16 Index;
//
// Don't use a too large value to init NextExpire
// since mTcpTick wraps around as sequence no does.
//
Tcb->NextExpire = 65535;
TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON);
for (Index = 0; Index < TCP_TIMER_NUMBER; Index++) {
if (TCP_TIMER_ON (Tcb->EnabledTimer, Index) &&
TCP_TIME_LT (Tcb->Timer[Index], mTcpTick + Tcb->NextExpire)) {
Tcb->NextExpire = TCP_SUB_TIME (Tcb->Timer[Index], mTcpTick);
TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON);
}
}
}
