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/** @file
Copyright (c) 2005 - 2006, Intel Corporation<BR>
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php<BR>
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef _TCP4_OPTION_H_
#define _TCP4_OPTION_H_
///
/// The structure to store the parse option value.
/// ParseOption only parse the options, don't process them.
///
typedef struct _TCP_OPTION {
UINT8 Flag; ///< Flag such as TCP_OPTION_RCVD_MSS
UINT8 WndScale; ///< The WndScale received
UINT16 Mss; ///< The Mss received
UINT32 TSVal; ///< The TSVal field in a timestamp option
UINT32 TSEcr; ///< The TSEcr field in a timestamp option
} TCP_OPTION;
typedef enum {
//
// supported TCP option type and their length
//
TCP_OPTION_EOP = 0, ///< End Of oPtion
TCP_OPTION_NOP = 1, ///< No-Option.
TCP_OPTION_MSS = 2, ///< Maximum Segment Size
TCP_OPTION_WS = 3, ///< Window scale
TCP_OPTION_TS = 8, ///< Timestamp
TCP_OPTION_MSS_LEN = 4, ///< Length of MSS option
TCP_OPTION_WS_LEN = 3, ///< Length of window scale option
TCP_OPTION_TS_LEN = 10, ///< Length of timestamp option
TCP_OPTION_WS_ALIGNED_LEN = 4, ///< Length of window scale option, aligned
TCP_OPTION_TS_ALIGNED_LEN = 12, ///< Length of timestamp option, aligned
//
// recommend format of timestamp window scale
// option for fast process.
//
TCP_OPTION_TS_FAST = ((TCP_OPTION_NOP << 24) |
(TCP_OPTION_NOP << 16) |
(TCP_OPTION_TS << 8) |
TCP_OPTION_TS_LEN),
TCP_OPTION_WS_FAST = ((TCP_OPTION_NOP << 24) |
(TCP_OPTION_WS << 16) |
(TCP_OPTION_WS_LEN << 8)),
TCP_OPTION_MSS_FAST = ((TCP_OPTION_MSS << 24) |
(TCP_OPTION_MSS_LEN << 16)),
//
// Other misc definations
//
TCP_OPTION_RCVD_MSS = 0x01,
TCP_OPTION_RCVD_WS = 0x02,
TCP_OPTION_RCVD_TS = 0x04,
TCP_OPTION_MAX_WS = 14, ///< Maxium window scale value
TCP_OPTION_MAX_WIN = 0xffff ///< Max window size in TCP header
} TCP_OPTION_TYPE;
/**
Compute the window scale value according to the given buffer size.
@param Tcb Pointer to the TCP_CB of this TCP instance.
@return The scale value.
**/
UINT8
TcpComputeScale (
IN TCP_CB *Tcb
);
/**
Build the TCP option in three-way handshake.
@param Tcb Pointer to the TCP_CB of this TCP instance.
@param Nbuf Pointer to the buffer to store the options.
@return The total length of the TCP option field.
**/
UINT16
TcpSynBuildOption (
IN TCP_CB *Tcb,
IN NET_BUF *Nbuf
);
/**
Build the TCP option in synchronized states.
@param Tcb Pointer to the TCP_CB of this TCP instance.
@param Nbuf Pointer to the buffer to store the options.
@return The total length of the TCP option field.
**/
UINT16
TcpBuildOption (
IN TCP_CB *Tcb,
IN NET_BUF *Nbuf
);
/**
Parse the supported options.
@param Tcp Pointer to the TCP_CB of this TCP instance.
@param Option Pointer to the TCP_OPTION used to store the successfully pasrsed
options.
@retval 0 The options are successfully pasrsed.
@retval -1 Ilegal option was found.
**/
INTN
TcpParseOption (
IN TCP_HEAD *Tcp,
IN TCP_OPTION *Option
);
/**
Check the segment against PAWS.
@param Tcb Pointer to the TCP_CB of this TCP instance.
@param 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
);
#endif
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