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124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/** @file
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Tcp option's routine header file.
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Copyright (c) 2009 - 2018, 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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#ifndef _TCP_OPTION_H_
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#define _TCP_OPTION_H_
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//
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// Supported TCP option types 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 definitions
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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 ///< Maximum 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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/// The structure to store the parse option value.
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/// ParseOption only parses the options, doesn'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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Compute the window scale value according to the given buffer size.
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@param[in] 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[in] Tcb Pointer to the TCP_CB of this TCP instance.
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@param[in] 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[in] Tcb Pointer to the TCP_CB of this TCP instance.
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@param[in] 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[in] Tcp Pointer to the TCP_CB of this TCP instance.
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@param[in, out] Option Pointer to the TCP_OPTION used to store the
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successfully pasrsed options.
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@retval 0 The options successfully pasrsed.
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@retval -1 Illegal 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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#endif
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