TcpInput.c File Reference

#include "TcpMain.h"

Go to the source code of this file.

Functions
INTN	TcpSeqAcceptable (IN TCP_CB *Tcb, IN TCP_SEG *Seg)
VOID	TcpFastRecover (IN OUT TCP_CB *Tcb, IN TCP_SEG *Seg)
VOID	TcpFastLossRecover (IN OUT TCP_CB *Tcb, IN TCP_SEG *Seg)
VOID	TcpComputeRtt (IN OUT TCP_CB *Tcb, IN UINT32 Measure)
INTN	TcpTrimSegment (IN NET_BUF *Nbuf, IN TCP_SEQNO Left, IN TCP_SEQNO Right)
INTN	TcpTrimInWnd (IN TCP_CB *Tcb, IN NET_BUF *Nbuf)
INTN	TcpDeliverData (IN OUT TCP_CB *Tcb)
INTN	TcpQueueData (IN OUT TCP_CB *Tcb, IN NET_BUF *Nbuf)
INTN	TcpAdjustSndQue (IN TCP_CB *Tcb, IN TCP_SEQNO Ack)
INTN	TcpInput (IN NET_BUF *Nbuf, IN EFI_IP_ADDRESS *Src, IN EFI_IP_ADDRESS *Dst, IN UINT8 Version)
VOID	TcpIcmpInput (IN NET_BUF *Nbuf, IN UINT8 IcmpErr, IN EFI_IP_ADDRESS *Src, IN EFI_IP_ADDRESS *Dst, IN UINT8 Version)

Detailed Description

TCP input process routines.

Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file TcpInput.c.

Function Documentation

TcpAdjustSndQue()

INTN TcpAdjustSndQue	(	IN TCP_CB *	Tcb,
		IN TCP_SEQNO	Ack
	)

Adjust the send queue or the retransmit queue.

Parameters

[in]	Tcb	Pointer to the TCP_CB of this TCP instance.
[in]	Ack	The acknowledge sequence number of the received segment.

Return values

0	An error condition occurred.
1	No error occurred.

Definition at line 656 of file TcpInput.c.

TcpComputeRtt()

VOID TcpComputeRtt	(	IN OUT TCP_CB *	Tcb,
		IN UINT32	Measure
	)

Compute the RTT as specified in RFC2988.

Parameters

[in,out]	Tcb	Pointer to the TCP_CB of this TCP instance.
[in]	Measure	Currently measured RTT in heartbeats.

Definition at line 203 of file TcpInput.c.

TcpDeliverData()

INTN TcpDeliverData

(

IN OUT TCP_CB *

Tcb

)

Process the data and FIN flag, and check whether to deliver data to the socket layer.

Parameters

[in,out]

Tcb

Pointer to the TCP_CB of this TCP instance.

Return values

0	No error occurred to deliver data.
-1	An error condition occurred. The proper response is to reset the connection.

Definition at line 370 of file TcpInput.c.

TcpFastLossRecover()

VOID TcpFastLossRecover	(	IN OUT TCP_CB *	Tcb,
		IN TCP_SEG *	Seg
	)

NewReno fast loss recovery defined in RFC3792.

Parameters

[in,out]	Tcb	Pointer to the TCP_CB of this TCP instance.
[in]	Seg	Segment that triggers the fast loss recovery.

Definition at line 156 of file TcpInput.c.

TcpFastRecover()

VOID TcpFastRecover	(	IN OUT TCP_CB *	Tcb,
		IN TCP_SEG *	Seg
	)

NewReno fast recovery defined in RFC3782.

Parameters

[in,out]	Tcb	Pointer to the TCP_CB of this TCP instance.
[in]	Seg	Segment that triggers the fast recovery.

Definition at line 40 of file TcpInput.c.

TcpIcmpInput()

VOID TcpIcmpInput	(	IN NET_BUF *	Nbuf,
		IN UINT8	IcmpErr,
		IN EFI_IP_ADDRESS *	Src,
		IN EFI_IP_ADDRESS *	Dst,
		IN UINT8	Version
	)

Process the received ICMP error messages for TCP.

Parameters

[in]	Nbuf	The buffer that contains part of the TCP segment without an IP header truncated from the ICMP error packet.
[in]	IcmpErr	The ICMP error code interpreted from an ICMP error packet.
[in]	Src	Source address of the ICMP error message.
[in]	Dst	Destination address of the ICMP error message.
[in]	Version	IP_VERSION_4 indicates IP4 stack. IP_VERSION_6 indicates IP6 stack.

Definition at line 1569 of file TcpInput.c.

TcpInput()

INTN TcpInput	(	IN NET_BUF *	Nbuf,
		IN EFI_IP_ADDRESS *	Src,
		IN EFI_IP_ADDRESS *	Dst,
		IN UINT8	Version
	)

Process the received TCP segments.

Parameters

[in]	Nbuf	Buffer that contains received a TCP segment without an IP header.
[in]	Src	Source address of the segment, or the peer's IP address.
[in]	Dst	Destination address of the segment, or the local end's IP address.
[in]	Version	IP_VERSION_4 indicates IP4 stack. IP_VERSION_6 indicates IP6 stack.

Return values

0	Segment processed successfully. It is either accepted or discarded. However, no connection is reset by the segment.
-1	A connection is reset by the segment.

Definition at line 710 of file TcpInput.c.

TcpQueueData()

INTN TcpQueueData	(	IN OUT TCP_CB *	Tcb,
		IN NET_BUF *	Nbuf
	)

Store the data into the reassemble queue.

Parameters

[in,out]	Tcb	Pointer to the TCP_CB of this TCP instance.
[in]	Nbuf	Pointer to the buffer containing the data to be queued.

Return values

0	An error condition occurred.
1	No error occurred to queue data.

Definition at line 548 of file TcpInput.c.

TcpSeqAcceptable()

INTN TcpSeqAcceptable	(	IN TCP_CB *	Tcb,
		IN TCP_SEG *	Seg
	)

Check whether the sequence number of the incoming segment is acceptable.

Parameters

[in]	Tcb	Pointer to the TCP_CB of this TCP instance.
[in]	Seg	Pointer to the incoming segment.

Return values

1	The sequence number is acceptable.
0	The sequence number is not acceptable.

Definition at line 23 of file TcpInput.c.

TcpTrimInWnd()

INTN TcpTrimInWnd	(	IN TCP_CB *	Tcb,
		IN NET_BUF *	Nbuf
	)

Trim off the data outside the tcb's receive window.

Parameters

[in]	Tcb	Pointer to the TCP_CB of this TCP instance.
[in]	Nbuf	Pointer to the NET_BUF containing the received tcp segment.

Return values

0	The segment is broken.
1	The segment is in good shape.

Definition at line 350 of file TcpInput.c.

TcpTrimSegment()

INTN TcpTrimSegment	(	IN NET_BUF *	Nbuf,
		IN TCP_SEQNO	Left,
		IN TCP_SEQNO	Right
	)

Trim the data; SYN and FIN to fit into the window defined by Left and Right.

Parameters

[in]	Nbuf	The buffer that contains a received TCP segment without an IP header.
[in]	Left	The sequence number of the window's left edge.
[in]	Right	The sequence number of the window's right edge.

Return values

0	The segment is broken.
1	The segment is in good shape.

Definition at line 265 of file TcpInput.c.