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1 | /** @file | |
2 | ||
3 | Copyright (c) 2005 - 2006, Intel Corporation | |
4 | All rights reserved. This program and the accompanying materials | |
5 | are licensed and made available under the terms and conditions of the BSD License | |
6 | which accompanies this distribution. The full text of the license may be found at | |
7 | http://opensource.org/licenses/bsd-license.php | |
8 | ||
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
11 | ||
12 | Module Name: | |
13 | ||
14 | Tcp4Option.h | |
15 | ||
16 | Abstract: | |
17 | ||
18 | ||
19 | **/ | |
20 | ||
21 | #ifndef _TCP4_OPTION_H_ | |
22 | #define _TCP4_OPTION_H_ | |
23 | ||
24 | // | |
25 | // The structure to store the parse option value. | |
26 | // ParseOption only parse the options, don't process them. | |
27 | // | |
28 | typedef struct s_TCP_OPTION { | |
29 | UINT8 Flag; // flag such as TCP_OPTION_RCVD_MSS | |
30 | UINT8 WndScale; // the WndScale received | |
31 | UINT16 Mss; // the Mss received | |
32 | UINT32 TSVal; // the TSVal field in a timestamp option | |
33 | UINT32 TSEcr; // the TSEcr field in a timestamp option | |
34 | } TCP_OPTION; | |
35 | ||
36 | enum { | |
37 | ||
38 | // | |
39 | // supported TCP option type and their length | |
40 | // | |
41 | TCP_OPTION_EOP = 0, // End Of oPtion | |
42 | TCP_OPTION_NOP = 1, // No-Option. | |
43 | TCP_OPTION_MSS = 2, // Maximum Segment Size | |
44 | TCP_OPTION_WS = 3, // Window scale | |
45 | TCP_OPTION_TS = 8, // Timestamp | |
46 | TCP_OPTION_MSS_LEN = 4, // length of MSS option | |
47 | TCP_OPTION_WS_LEN = 3, // length of window scale option | |
48 | TCP_OPTION_TS_LEN = 10, // length of timestamp option | |
49 | TCP_OPTION_WS_ALIGNED_LEN = 4, // length of window scale option, aligned | |
50 | TCP_OPTION_TS_ALIGNED_LEN = 12, // length of timestamp option, aligned | |
51 | ||
52 | // | |
53 | // recommend format of timestamp window scale | |
54 | // option for fast process. | |
55 | // | |
56 | TCP_OPTION_TS_FAST = ((TCP_OPTION_NOP << 24) | | |
57 | (TCP_OPTION_NOP << 16) | | |
58 | (TCP_OPTION_TS << 8) | | |
59 | TCP_OPTION_TS_LEN), | |
60 | ||
61 | TCP_OPTION_WS_FAST = ((TCP_OPTION_NOP << 24) | | |
62 | (TCP_OPTION_WS << 16) | | |
63 | (TCP_OPTION_WS_LEN << 8)), | |
64 | ||
65 | TCP_OPTION_MSS_FAST = ((TCP_OPTION_MSS << 24) | | |
66 | (TCP_OPTION_MSS_LEN << 16)), | |
67 | ||
68 | // | |
69 | // Other misc definations | |
70 | // | |
71 | TCP_OPTION_MAX_WS = 14, // Maxium window scale value | |
72 | TCP_OPTION_MAX_WIN = 0xffff, // max window size in TCP header | |
73 | TCP_OPTION_RCVD_MSS = 0x01, | |
74 | TCP_OPTION_RCVD_WS = 0x02, | |
75 | TCP_OPTION_RCVD_TS = 0x04 | |
76 | }; | |
77 | ||
78 | UINT8 | |
79 | TcpComputeScale ( | |
80 | IN TCP_CB *Tcb | |
81 | ); | |
82 | ||
83 | UINT16 | |
84 | TcpSynBuildOption ( | |
85 | IN TCP_CB *Tcb, | |
86 | IN NET_BUF *Buf | |
87 | ); | |
88 | ||
89 | UINT16 | |
90 | TcpBuildOption ( | |
91 | IN TCP_CB *Tcb, | |
92 | IN NET_BUF *Buf | |
93 | ); | |
94 | ||
95 | INTN | |
96 | TcpParseOption ( | |
97 | IN TCP_HEAD *Tcp, | |
98 | IN TCP_OPTION *Option | |
99 | ); | |
100 | ||
101 | UINT32 | |
102 | TcpPawsOK ( | |
103 | IN TCP_CB *Tcb, | |
104 | IN UINT32 TSVal | |
105 | ); | |
106 | ||
107 | #endif |