diff options
Diffstat (limited to 'NetworkPkg/TcpDxe/TcpOption.h')
| -rw-r--r-- | NetworkPkg/TcpDxe/TcpOption.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/NetworkPkg/TcpDxe/TcpOption.h b/NetworkPkg/TcpDxe/TcpOption.h new file mode 100644 index 0000000000..0ccadb9536 --- /dev/null +++ b/NetworkPkg/TcpDxe/TcpOption.h @@ -0,0 +1,145 @@ +/** @file
+ Tcp option's routine header file.
+
+ Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
+
+ 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.
+
+ 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 _TCP_OPTION_H_
+#define _TCP_OPTION_H_
+
+//
+// Supported TCP option types and their length.
+//
+#define TCP_OPTION_EOP 0 ///< End Of oPtion
+#define TCP_OPTION_NOP 1 ///< No-Option.
+#define TCP_OPTION_MSS 2 ///< Maximum Segment Size
+#define TCP_OPTION_WS 3 ///< Window scale
+#define TCP_OPTION_TS 8 ///< Timestamp
+#define TCP_OPTION_MSS_LEN 4 ///< Length of MSS option
+#define TCP_OPTION_WS_LEN 3 ///< Length of window scale option
+#define TCP_OPTION_TS_LEN 10 ///< Length of timestamp option
+#define TCP_OPTION_WS_ALIGNED_LEN 4 ///< Length of window scale option, aligned
+#define TCP_OPTION_TS_ALIGNED_LEN 12 ///< Length of timestamp option, aligned
+
+//
+// recommend format of timestamp window scale
+// option for fast process.
+//
+#define TCP_OPTION_TS_FAST ((TCP_OPTION_NOP << 24) | \
+ (TCP_OPTION_NOP << 16) | \
+ (TCP_OPTION_TS << 8) | \
+ (TCP_OPTION_TS_LEN))
+
+#define TCP_OPTION_WS_FAST ((TCP_OPTION_NOP << 24) | \
+ (TCP_OPTION_WS << 16) | \
+ (TCP_OPTION_WS_LEN << 8))
+
+#define TCP_OPTION_MSS_FAST ((TCP_OPTION_MSS << 24) | (TCP_OPTION_MSS_LEN << 16))
+
+//
+// Other misc definations
+//
+#define TCP_OPTION_RCVD_MSS 0x01
+#define TCP_OPTION_RCVD_WS 0x02
+#define TCP_OPTION_RCVD_TS 0x04
+#define TCP_OPTION_MAX_WS 14 ///< Maxium window scale value
+#define TCP_OPTION_MAX_WIN 0xffff ///< Max window size in TCP header
+
+///
+/// The structure to store the parse option value.
+/// ParseOption only parses the options, doesn'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;
+
+/**
+ Compute the window scale value according to the given buffer size.
+
+ @param[in] 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[in] Tcb Pointer to the TCP_CB of this TCP instance.
+ @param[in] 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[in] Tcb Pointer to the TCP_CB of this TCP instance.
+ @param[in] 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[in] Tcp Pointer to the TCP_CB of this TCP instance.
+ @param[in, out] Option Pointer to the TCP_OPTION used to store the
+ successfully pasrsed options.
+
+ @retval 0 The options successfully pasrsed.
+ @retval -1 Ilegal option was found.
+
+**/
+INTN
+TcpParseOption (
+ IN TCP_HEAD *Tcp,
+ IN OUT TCP_OPTION *Option
+ );
+
+/**
+ Check the segment against PAWS.
+
+ @param[in] Tcb Pointer to the TCP_CB of this TCP instance.
+ @param[in] 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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