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Transport Driver Interface

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The Transport Dispatch Interface or TDI is the protocol understood by the upper edge of the Transport Provider layer of the Windows NT/2k/XP kernel network stack.

Transport Providers are implementations of network protocols such as TCP/IP, NetBIOS, and AppleTalk.

When user-mode binaries are created by compiling and linking, an entity called a TDI client is linked into the binary. TDI clients are provided with the compiler. The user-mode binary uses the user-mode API of whatever network protocol is being used, which in turn causes the TDI client to emit TDI commands into the Transport Provider.

Typical TDI commands are TDI_SEND, TDI_CONNECT, TDI_RECEIVE.

The purpose of the Transport Dispatch Interface is to provide an abstraction layer, permitting simplification of the TDI clients.

References

  • Windows XP Driver Development Kit documentation.
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