mirror of https://github.com/acidanthera/audk.git
146 lines
4.2 KiB
C
146 lines
4.2 KiB
C
/** @file
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Tcp option's routine header file.
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Copyright (c) 2005 - 2009, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php<BR>
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef _TCP4_OPTION_H_
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#define _TCP4_OPTION_H_
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///
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/// The structure to store the parse option value.
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/// ParseOption only parse the options, don't process them.
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///
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typedef struct _TCP_OPTION {
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UINT8 Flag; ///< Flag such as TCP_OPTION_RCVD_MSS
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UINT8 WndScale; ///< The WndScale received
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UINT16 Mss; ///< The Mss received
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UINT32 TSVal; ///< The TSVal field in a timestamp option
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UINT32 TSEcr; ///< The TSEcr field in a timestamp option
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} TCP_OPTION;
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//
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// supported TCP option type and their length
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//
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#define TCP_OPTION_EOP 0 ///< End Of oPtion
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#define TCP_OPTION_NOP 1 ///< No-Option.
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#define TCP_OPTION_MSS 2 ///< Maximum Segment Size
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#define TCP_OPTION_WS 3 ///< Window scale
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#define TCP_OPTION_TS 8 ///< Timestamp
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#define TCP_OPTION_MSS_LEN 4 ///< Length of MSS option
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#define TCP_OPTION_WS_LEN 3 ///< Length of window scale option
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#define TCP_OPTION_TS_LEN 10 ///< Length of timestamp option
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#define TCP_OPTION_WS_ALIGNED_LEN 4 ///< Length of window scale option, aligned
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#define TCP_OPTION_TS_ALIGNED_LEN 12 ///< Length of timestamp option, aligned
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//
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// recommend format of timestamp window scale
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// option for fast process.
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//
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#define TCP_OPTION_TS_FAST ((TCP_OPTION_NOP << 24) | \
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(TCP_OPTION_NOP << 16) | \
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(TCP_OPTION_TS << 8) | \
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(TCP_OPTION_TS_LEN))
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#define TCP_OPTION_WS_FAST ((TCP_OPTION_NOP << 24) | \
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(TCP_OPTION_WS << 16) | \
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(TCP_OPTION_WS_LEN << 8))
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#define TCP_OPTION_MSS_FAST ((TCP_OPTION_MSS << 24) | (TCP_OPTION_MSS_LEN << 16))
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//
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// Other misc definations
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//
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#define TCP_OPTION_RCVD_MSS 0x01
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#define TCP_OPTION_RCVD_WS 0x02
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#define TCP_OPTION_RCVD_TS 0x04
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#define TCP_OPTION_MAX_WS 14 ///< Maxium window scale value
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#define TCP_OPTION_MAX_WIN 0xffff ///< Max window size in TCP header
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/**
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Compute the window scale value according to the given buffer size.
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@param Tcb Pointer to the TCP_CB of this TCP instance.
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@return The scale value.
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**/
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UINT8
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TcpComputeScale (
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IN TCP_CB *Tcb
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);
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/**
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Build the TCP option in three-way handshake.
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@param Tcb Pointer to the TCP_CB of this TCP instance.
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@param Nbuf Pointer to the buffer to store the options.
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@return The total length of the TCP option field.
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**/
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UINT16
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TcpSynBuildOption (
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IN TCP_CB *Tcb,
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IN NET_BUF *Nbuf
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);
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/**
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Build the TCP option in synchronized states.
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@param Tcb Pointer to the TCP_CB of this TCP instance.
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@param Nbuf Pointer to the buffer to store the options.
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@return The total length of the TCP option field.
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**/
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UINT16
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TcpBuildOption (
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IN TCP_CB *Tcb,
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IN NET_BUF *Nbuf
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);
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/**
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Parse the supported options.
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@param Tcp Pointer to the TCP_CB of this TCP instance.
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@param Option Pointer to the TCP_OPTION used to store the successfully pasrsed
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options.
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@retval 0 The options are successfully pasrsed.
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@retval -1 Ilegal option was found.
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**/
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INTN
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TcpParseOption (
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IN TCP_HEAD *Tcp,
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IN OUT TCP_OPTION *Option
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);
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/**
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Check the segment against PAWS.
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@param Tcb Pointer to the TCP_CB of this TCP instance.
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@param TSVal The timestamp value.
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@retval 1 The segment passed the PAWS check.
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@retval 0 The segment failed to pass the PAWS check.
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**/
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UINT32
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TcpPawsOK (
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IN TCP_CB *Tcb,
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IN UINT32 TSVal
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);
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#endif
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