mirror of https://github.com/acidanthera/audk.git
588 lines
12 KiB
C
588 lines
12 KiB
C
/** @file
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TCP timer related functions.
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Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "TcpMain.h"
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UINT32 mTcpTick = 1000;
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/**
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Connect timeout handler.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpConnectTimeout (
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IN OUT TCP_CB *Tcb
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);
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/**
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Timeout handler for TCP retransmission timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpRexmitTimeout (
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IN OUT TCP_CB *Tcb
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);
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/**
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Timeout handler for window probe timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpProbeTimeout (
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IN OUT TCP_CB *Tcb
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);
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/**
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Timeout handler for keepalive timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpKeepaliveTimeout (
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IN OUT TCP_CB *Tcb
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);
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/**
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Timeout handler for FIN_WAIT_2 timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpFinwait2Timeout (
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IN OUT TCP_CB *Tcb
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);
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/**
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Timeout handler for 2MSL timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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Tcp2MSLTimeout (
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IN OUT TCP_CB *Tcb
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);
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TCP_TIMER_HANDLER mTcpTimerHandler[TCP_TIMER_NUMBER] = {
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TcpConnectTimeout,
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TcpRexmitTimeout,
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TcpProbeTimeout,
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TcpKeepaliveTimeout,
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TcpFinwait2Timeout,
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Tcp2MSLTimeout,
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};
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/**
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Close the TCP connection.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpClose (
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IN OUT TCP_CB *Tcb
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)
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{
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NetbufFreeList (&Tcb->SndQue);
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NetbufFreeList (&Tcb->RcvQue);
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TcpSetState (Tcb, TCP_CLOSED);
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}
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/**
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Backoff the RTO.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpBackoffRto (
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IN OUT TCP_CB *Tcb
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)
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{
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//
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// Fold the RTT estimate if too many times, the estimate
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// may be wrong, fold it. So the next time a valid
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// measurement is sampled, we can start fresh.
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//
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if ((Tcb->LossTimes >= TCP_FOLD_RTT) && (Tcb->SRtt != 0)) {
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Tcb->RttVar += Tcb->SRtt >> 2;
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Tcb->SRtt = 0;
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}
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Tcb->Rto <<= 1;
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if (Tcb->Rto < TCP_RTO_MIN) {
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Tcb->Rto = TCP_RTO_MIN;
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} else if (Tcb->Rto > TCP_RTO_MAX) {
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Tcb->Rto = TCP_RTO_MAX;
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}
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}
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/**
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Connect timeout handler.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpConnectTimeout (
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IN OUT TCP_CB *Tcb
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)
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{
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if (!TCP_CONNECTED (Tcb->State)) {
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DEBUG (
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(EFI_D_ERROR,
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"TcpConnectTimeout: connection closed because connection timer timeout for TCB %p\n",
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Tcb)
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);
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if (EFI_ABORTED == Tcb->Sk->SockError) {
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SOCK_ERROR (Tcb->Sk, EFI_TIMEOUT);
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}
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if (TCP_SYN_RCVD == Tcb->State) {
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DEBUG (
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(EFI_D_WARN,
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"TcpConnectTimeout: send reset because connection timer timeout for TCB %p\n",
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Tcb)
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);
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TcpResetConnection (Tcb);
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}
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TcpClose (Tcb);
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}
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}
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/**
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Timeout handler for TCP retransmission timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpRexmitTimeout (
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IN OUT TCP_CB *Tcb
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)
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{
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UINT32 FlightSize;
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DEBUG (
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(EFI_D_WARN,
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"TcpRexmitTimeout: transmission timeout for TCB %p\n",
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Tcb)
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);
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//
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// Set the congestion window. FlightSize is the
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// amount of data that has been sent but not
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// yet ACKed.
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//
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FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);
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Tcb->Ssthresh = MAX ((UINT32) (2 * Tcb->SndMss), FlightSize / 2);
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Tcb->CWnd = Tcb->SndMss;
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Tcb->LossRecover = Tcb->SndNxt;
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Tcb->LossTimes++;
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if ((Tcb->LossTimes > Tcb->MaxRexmit) && !TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_CONNECT)) {
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DEBUG (
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(EFI_D_ERROR,
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"TcpRexmitTimeout: connection closed because too many timeouts for TCB %p\n",
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Tcb)
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);
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if (EFI_ABORTED == Tcb->Sk->SockError) {
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SOCK_ERROR (Tcb->Sk, EFI_TIMEOUT);
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}
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TcpClose (Tcb);
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return ;
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}
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TcpBackoffRto (Tcb);
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TcpRetransmit (Tcb, Tcb->SndUna);
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TcpSetTimer (Tcb, TCP_TIMER_REXMIT, Tcb->Rto);
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Tcb->CongestState = TCP_CONGEST_LOSS;
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TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);
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}
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/**
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Timeout handler for window probe timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpProbeTimeout (
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IN OUT TCP_CB *Tcb
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)
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{
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//
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// This is the timer for sender's SWSA. RFC1122 requires
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// a timer set for sender's SWSA, and suggest combine it
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// with window probe timer. If data is sent, don't set
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// the probe timer, since retransmit timer is on.
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//
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if ((TcpDataToSend (Tcb, 1) != 0) && (TcpToSendData (Tcb, 1) > 0)) {
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ASSERT (TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_REXMIT) != 0);
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Tcb->ProbeTimerOn = FALSE;
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return ;
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}
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TcpSendZeroProbe (Tcb);
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TcpSetProbeTimer (Tcb);
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}
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/**
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Timeout handler for keepalive timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpKeepaliveTimeout (
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IN OUT TCP_CB *Tcb
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)
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{
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Tcb->KeepAliveProbes++;
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//
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// Too many Keep-alive probes, drop the connection
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//
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if (Tcb->KeepAliveProbes > Tcb->MaxKeepAlive) {
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if (EFI_ABORTED == Tcb->Sk->SockError) {
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SOCK_ERROR (Tcb->Sk, EFI_TIMEOUT);
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}
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TcpClose (Tcb);
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return ;
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}
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TcpSendZeroProbe (Tcb);
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TcpSetKeepaliveTimer (Tcb);
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}
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/**
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Timeout handler for FIN_WAIT_2 timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpFinwait2Timeout (
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IN OUT TCP_CB *Tcb
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)
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{
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DEBUG (
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(EFI_D_WARN,
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"TcpFinwait2Timeout: connection closed because FIN_WAIT2 timer timeouts for TCB %p\n",
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Tcb)
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);
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TcpClose (Tcb);
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}
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/**
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Timeout handler for 2MSL timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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Tcp2MSLTimeout (
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IN OUT TCP_CB *Tcb
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)
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{
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DEBUG (
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(EFI_D_WARN,
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"Tcp2MSLTimeout: connection closed because TIME_WAIT timer timeouts for TCB %p\n",
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Tcb)
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);
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TcpClose (Tcb);
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}
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/**
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Update the timer status and the next expire time according to the timers
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to expire in a specific future time slot.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpUpdateTimer (
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IN OUT TCP_CB *Tcb
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)
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{
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UINT16 Index;
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//
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// Don't use a too large value to init NextExpire
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// since mTcpTick wraps around as sequence no does.
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//
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Tcb->NextExpire = TCP_EXPIRE_TIME;
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TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON);
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for (Index = 0; Index < TCP_TIMER_NUMBER; Index++) {
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if (TCP_TIMER_ON (Tcb->EnabledTimer, Index) &&
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TCP_TIME_LT (Tcb->Timer[Index], mTcpTick + Tcb->NextExpire)
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) {
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Tcb->NextExpire = TCP_SUB_TIME (Tcb->Timer[Index], mTcpTick);
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TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON);
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}
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}
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}
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/**
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Enable a TCP timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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@param[in] Timer The index of the timer to be enabled.
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@param[in] TimeOut The timeout value of this timer.
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**/
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VOID
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TcpSetTimer (
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IN OUT TCP_CB *Tcb,
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IN UINT16 Timer,
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IN UINT32 TimeOut
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)
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{
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TCP_SET_TIMER (Tcb->EnabledTimer, Timer);
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Tcb->Timer[Timer] = mTcpTick + TimeOut;
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TcpUpdateTimer (Tcb);
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}
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/**
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Clear one TCP timer.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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@param[in] Timer The index of the timer to be cleared.
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**/
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VOID
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TcpClearTimer (
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IN OUT TCP_CB *Tcb,
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IN UINT16 Timer
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)
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{
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TCP_CLEAR_TIMER (Tcb->EnabledTimer, Timer);
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TcpUpdateTimer (Tcb);
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}
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/**
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Clear all TCP timers.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpClearAllTimer (
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IN OUT TCP_CB *Tcb
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)
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{
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Tcb->EnabledTimer = 0;
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TcpUpdateTimer (Tcb);
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}
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/**
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Enable the window prober timer and set the timeout value.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpSetProbeTimer (
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IN OUT TCP_CB *Tcb
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)
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{
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if (!Tcb->ProbeTimerOn) {
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Tcb->ProbeTime = Tcb->Rto;
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Tcb->ProbeTimerOn = TRUE;
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} else {
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Tcb->ProbeTime <<= 1;
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}
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if (Tcb->ProbeTime < TCP_RTO_MIN) {
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Tcb->ProbeTime = TCP_RTO_MIN;
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} else if (Tcb->ProbeTime > TCP_RTO_MAX) {
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Tcb->ProbeTime = TCP_RTO_MAX;
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}
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TcpSetTimer (Tcb, TCP_TIMER_PROBE, Tcb->ProbeTime);
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}
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/**
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Enable the keepalive timer and set the timeout value.
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@param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.
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**/
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VOID
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TcpSetKeepaliveTimer (
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IN OUT TCP_CB *Tcb
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)
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{
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if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_KEEPALIVE)) {
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return ;
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}
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//
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// Set the timer to KeepAliveIdle if either
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// 1. the keepalive timer is off
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// 2. The keepalive timer is on, but the idle
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// is less than KeepAliveIdle, that means the
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// connection is alive since our last probe.
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//
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if (!TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_KEEPALIVE) ||
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(Tcb->Idle < Tcb->KeepAliveIdle)
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) {
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TcpSetTimer (Tcb, TCP_TIMER_KEEPALIVE, Tcb->KeepAliveIdle);
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Tcb->KeepAliveProbes = 0;
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} else {
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TcpSetTimer (Tcb, TCP_TIMER_KEEPALIVE, Tcb->KeepAlivePeriod);
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}
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}
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/**
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Heart beat timer handler.
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@param[in] Context Context of the timer event, ignored.
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**/
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VOID
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EFIAPI
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TcpTickingDpc (
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IN VOID *Context
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)
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{
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LIST_ENTRY *Entry;
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LIST_ENTRY *Next;
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TCP_CB *Tcb;
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INT16 Index;
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mTcpTick++;
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mTcpGlobalIss += TCP_ISS_INCREMENT_2;
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//
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// Don't use LIST_FOR_EACH, which isn't delete safe.
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//
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for (Entry = mTcpRunQue.ForwardLink; Entry != &mTcpRunQue; Entry = Next) {
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Next = Entry->ForwardLink;
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Tcb = NET_LIST_USER_STRUCT (Entry, TCP_CB, List);
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if (Tcb->State == TCP_CLOSED) {
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continue;
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}
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//
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// The connection is doing RTT measurement.
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//
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if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON)) {
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Tcb->RttMeasure++;
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}
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Tcb->Idle++;
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if (Tcb->DelayedAck != 0) {
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TcpSendAck (Tcb);
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}
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if (Tcb->IpInfo->IpVersion == IP_VERSION_6 && Tcb->Tick > 0) {
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Tcb->Tick--;
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}
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//
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// No timer is active or no timer expired
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//
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if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON) || ((--Tcb->NextExpire) > 0)) {
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continue;
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}
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//
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// Call the timeout handler for each expired timer.
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//
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for (Index = 0; Index < TCP_TIMER_NUMBER; Index++) {
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if (TCP_TIMER_ON (Tcb->EnabledTimer, Index) && TCP_TIME_LEQ (Tcb->Timer[Index], mTcpTick)) {
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//
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// disable the timer before calling the handler
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// in case the handler enables it again.
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//
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TCP_CLEAR_TIMER (Tcb->EnabledTimer, Index);
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mTcpTimerHandler[Index](Tcb);
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//
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// The Tcb may have been deleted by the timer, or
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// no other timer is set.
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//
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if ((Next->BackLink != Entry) || (Tcb->EnabledTimer == 0)) {
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break;
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}
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}
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}
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//
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// If the Tcb still exist or some timer is set, update the timer
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//
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if (Index == TCP_TIMER_NUMBER) {
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TcpUpdateTimer (Tcb);
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}
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}
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}
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/**
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Heart beat timer handler, queues the DPC at TPL_CALLBACK.
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@param[in] Event Timer event signaled, ignored.
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@param[in] Context Context of the timer event, ignored.
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**/
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VOID
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EFIAPI
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TcpTicking (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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{
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QueueDpc (TPL_CALLBACK, TcpTickingDpc, Context);
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}
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