329 lines
12 KiB
C
329 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2018-2020 WireGuard LLC. All Rights Reserved.
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*/
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#pragma once
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#include <Windows.h>
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#include <IPExport.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef _Return_type_success_(return == ERROR_SUCCESS) DWORD WINTUN_STATUS;
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/**
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* A handle representing Wintun adapter
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*/
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typedef void *WINTUN_ADAPTER_HANDLE;
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/**
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* Maximum pool name length including zero terminator
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*/
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#define WINTUN_MAX_POOL 256
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/**
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* Creates a Wintun adapter.
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*
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* @param Pool Name of the adapter pool. Zero-terminated string of up to WINTUN_MAX_POOL-1 characters.
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*
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* @param Name The requested name of the adapter. Zero-terminated string of up to MAX_ADAPTER_NAME-1
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* characters.
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*
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* @param RequestedGUID The GUID of the created network adapter, which then influences NLA generation
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* deterministically. If it is set to NULL, the GUID is chosen by the system at random, and hence
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* a new NLA entry is created for each new adapter. It is called "requested" GUID because the API
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* it uses is completely undocumented, and so there could be minor interesting complications with
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* its usage.
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*
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* @param Adapter Pointer to a handle to receive the adapter handle. Must be released with
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* WintunFreeAdapter.
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*
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* @param RebootRequired Optional pointer to a boolean flag to be set to TRUE in case SetupAPI suggests a reboot.
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*
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* @return ERROR_SUCCESS on success; Win32 error code otherwise.
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*/
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typedef WINTUN_STATUS(WINAPI *WINTUN_CREATE_ADAPTER_FUNC)(
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_In_z_ const WCHAR *Pool,
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_In_z_ const WCHAR *Name,
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_In_opt_ const GUID *RequestedGUID,
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_Out_ WINTUN_ADAPTER_HANDLE *Adapter,
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_Out_opt_ BOOL *RebootRequired);
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/**
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* Deletes a Wintun adapter.
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*
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* @param Adapter Adapter handle obtained with WintunGetAdapter or WintunCreateAdapter.
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*
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* @param ForceCloseSessions Force close adapter handles that may be in use by other processes. Only set this to TRUE
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* with extreme care, as this is resource intensive and may put processes into an undefined
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* or unpredictable state. Most users should set this to FALSE.
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*
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* @param RebootRequired Optional pointer to a boolean flag to be set to TRUE in case SetupAPI suggests a reboot.
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*
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* @return ERROR_SUCCESS on success or the adapter was not found; Win32 error code otherwise.
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*/
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typedef WINTUN_STATUS(WINAPI *WINTUN_DELETE_ADAPTER_FUNC)(
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_In_ WINTUN_ADAPTER_HANDLE Adapter,
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_In_ BOOL ForceCloseSessions,
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_Out_opt_ BOOL *RebootRequired);
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/**
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* Called by WintunEnumAdapters for each adapter in the pool.
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*
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* @param Adapter Adapter handle.
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*
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* @param Param An application-defined value passed to the WintunEnumAdapters.
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*
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* @return Non-zero to continue iterating adapters; zero to stop.
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*/
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typedef BOOL(CALLBACK *WINTUN_ENUM_CALLBACK_FUNC)(_In_ WINTUN_ADAPTER_HANDLE Adapter, _In_ LPARAM Param);
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/**
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* Enumerates all Wintun adapters.
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*
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* @param Pool Name of the adapter pool. Zero-terminated string of up to WINTUN_MAX_POOL-1 characters.
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*
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* @param Func Callback function. To continue enumeration, the callback function must return TRUE; to stop
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* enumeration, it must return FALSE.
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*
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* @param Param An application-defined value to be passed to the callback function.
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*
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* @return ERROR_SUCCESS on success; Win32 error code otherwise.
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*/
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typedef WINTUN_STATUS(
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WINAPI *WINTUN_ENUM_ADAPTERS_FUNC)(_In_z_ const WCHAR *Pool, _In_ WINTUN_ENUM_CALLBACK_FUNC Callback, _In_ LPARAM Param);
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/**
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* Releases Wintun adapter resources.
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*
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* @param Adapter Adapter handle obtained with WintunGetAdapter or WintunCreateAdapter.
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*/
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typedef void(WINAPI *WINTUN_FREE_ADAPTER_FUNC)(_In_ WINTUN_ADAPTER_HANDLE Adapter);
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/**
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* Finds a Wintun adapter by its name.
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*
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* @param Pool Name of the adapter pool. Zero-terminated string of up to WINTUN_MAX_POOL-1 characters.
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*
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* @param Name Adapter name. Zero-terminated string of up to MAX_ADAPTER_NAME-1 characters.
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*
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* @param Adapter Pointer to a handle to receive the adapter handle. Must be released with WintunFreeAdapter.
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*
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* @return ERROR_SUCCESS on success; ERROR_FILE_NOT_FOUND if adapter with given name is not found; ERROR_ALREADY_EXISTS
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* if adapter is found but not a Wintun-class or not a member of the pool; Win32 error code otherwise
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*/
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typedef WINTUN_STATUS(WINAPI *WINTUN_GET_ADAPTER_FUNC)(
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_In_z_ const WCHAR *Pool,
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_In_z_ const WCHAR *Name,
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_Out_ WINTUN_ADAPTER_HANDLE *Adapter);
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/**
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* Returns a handle to the adapter device object.
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*
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* @param Adapter Adapter handle obtained with WintunGetAdapter or WintunCreateAdapter.
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*
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* @param Handle Pointer to receive the adapter device object handle. Must be released with CloseHandle.
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*
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* @return ERROR_SUCCESS on success; Win32 error code otherwise.
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*/
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typedef WINTUN_STATUS(
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WINAPI *WINTUN_GET_ADAPTER_DEVICE_OBJECT_FUNC)(_In_ WINTUN_ADAPTER_HANDLE Adapter, _Out_ HANDLE *Handle);
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/**
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* Returns the GUID of the adapter.
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*
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* @param Adapter Adapter handle obtained with WintunGetAdapter or WintunCreateAdapter
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*
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* @param Guid Pointer to GUID to receive adapter ID.
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*/
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typedef void(WINAPI *WINTUN_GET_ADAPTER_GUID_FUNC)(_In_ WINTUN_ADAPTER_HANDLE Adapter, _Out_ GUID *Guid);
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/**
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* Returns the LUID of the adapter.
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*
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* @param Adapter Adapter handle obtained with WintunGetAdapter or WintunCreateAdapter
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*
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* @param Luid Pointer to LUID to receive adapter LUID.
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*/
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typedef void(WINAPI *WINTUN_GET_ADAPTER_LUID_FUNC)(_In_ WINTUN_ADAPTER_HANDLE Adapter, _Out_ LUID *Luid);
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/**
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* Returns the name of the Wintun adapter.
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*
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* @param Adapter Adapter handle obtained with WintunGetAdapter or WintunCreateAdapter
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*
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* @param Name Pointer to a string to receive adapter name
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*
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* @return ERROR_SUCCESS on success; Win32 error code otherwise.
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*/
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typedef WINTUN_STATUS(WINAPI *WINTUN_GET_ADAPTER_NAME_FUNC)(
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_In_ WINTUN_ADAPTER_HANDLE Adapter,
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_Out_cap_c_(MAX_ADAPTER_NAME) WCHAR *Name);
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/**
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* Determines the version of the Wintun driver currently loaded.
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*
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* @return The version number on success, or 0 if failure.
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*/
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typedef DWORDLONG(WINAPI *WINTUN_GET_VERSION_FUNC)(void);
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/**
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* Sets name of the Wintun adapter.
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*
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* @param Adapter Adapter handle obtained with WintunGetAdapter or WintunCreateAdapter
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*
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* @param Name Adapter name. Zero-terminated string of up to MAX_ADAPTER_NAME-1 characters.
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*
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* @return ERROR_SUCCESS on success; Win32 error code otherwise.
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*/
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typedef WINTUN_STATUS(
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WINAPI *WINTUN_SET_ADAPTER_NAME_FUNC)(_In_ WINTUN_ADAPTER_HANDLE Adapter, _In_z_ const WCHAR *Name);
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typedef enum _WINTUN_LOGGER_LEVEL
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{
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WINTUN_LOG_INFO = 0,
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WINTUN_LOG_WARN,
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WINTUN_LOG_ERR
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} WINTUN_LOGGER_LEVEL;
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/**
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* Called by internal logger to report diagnostic messages
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*
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* @param Level Message level.
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*
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* @param Message Message text.
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*
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* @return Anything - return value is ignored.
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*/
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typedef BOOL(CALLBACK *WINTUN_LOGGER_CALLBACK_FUNC)(_In_ WINTUN_LOGGER_LEVEL Level, _In_z_ const WCHAR *Message);
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/**
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* Sets logger callback function.
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*
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* @param NewLogger Pointer to callback function to use as a new global logger. NewLogger may be called from various
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* threads concurrently. Should the logging require serialization, you must handle serialization in
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* NewLogger.
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*/
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typedef void(WINAPI *WINTUN_SET_LOGGER_FUNC)(_In_ WINTUN_LOGGER_CALLBACK_FUNC NewLogger);
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/**
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* Minimum ring capacity.
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*/
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#define WINTUN_MIN_RING_CAPACITY 0x20000 /* 128kiB */
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/**
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* Maximum ring capacity.
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*/
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#define WINTUN_MAX_RING_CAPACITY 0x4000000 /* 64MiB */
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/**
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* A handle representing Wintun session
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*/
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typedef void *WINTUN_SESSION_HANDLE;
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/**
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* Starts Wintun session.
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*
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* @param Adapter Adapter handle obtained with WintunGetAdapter or WintunCreateAdapter
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*
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* @param Capacity Rings capacity. Must be between WINTUN_MIN_RING_CAPACITY and WINTUN_MAX_RING_CAPACITY (incl.)
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* Must be a power of two.
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*
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* @param Session Pointer to a variable to receive Wintun session handle
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*
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* @param ReadWait Pointer to receive event handle to wait for available data when reading. Should
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* WintunReceivePackets return ERROR_NO_MORE_ITEMS (after spinning on it for a while under heavy
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* load), wait for this event to become signaled before retrying WintunReceivePackets. Do not call
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* CloseHandle on this event - it is managed by the session.
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*
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* @return ERROR_SUCCESS on success; Win32 error code otherwise.
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*/
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typedef WINTUN_STATUS(WINAPI *WINTUN_START_SESSION_FUNC)(
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_In_ WINTUN_ADAPTER_HANDLE Adapter,
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_In_ DWORD Capacity,
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_Out_ WINTUN_SESSION_HANDLE *Session,
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_Out_ HANDLE *ReadWait);
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/**
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* Ends Wintun session.
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*
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* @param Session Wintun session handle obtained with WintunStartSession
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*/
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typedef void(WINAPI *WINTUN_END_SESSION_FUNC)(_In_ WINTUN_SESSION_HANDLE Session);
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/**
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* Maximum IP packet size
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*/
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#define WINTUN_MAX_IP_PACKET_SIZE 0xFFFF
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/**
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* Retrieves one or packet. After the packet content is consumed, call WintunReceiveRelease with Packet returned
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* from this function to release internal buffer. This function is thread-safe.
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*
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* @param Session Wintun session handle obtained with WintunStartSession
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*
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* @param Packet Pointer to receive pointer to layer 3 IPv4 or IPv6 packet. Client may modify its content at
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* will.
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*
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* @param PacketSize Pointer to receive Packet size.
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*
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* @return Returns one of the following values:
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* ERROR_HANDLE_EOF Wintun adapter is terminating;
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* ERROR_NO_MORE_ITEMS Wintun buffer is exhausted;
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* ERROR_INVALID_DATA Wintun buffer is corrupt;
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* ERROR_SUCCESS on success.
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* Regardless, if the error was returned, some packets might have been read nevertheless.
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*/
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typedef WINTUN_STATUS(WINAPI *WINTUN_RECEIVE_PACKET_FUNC)(
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_In_ WINTUN_SESSION_HANDLE *Session,
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_Out_bytecapcount_(*PacketSize) BYTE **Packet,
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_Out_ DWORD *PacketSize);
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/**
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* Releases internal buffer after the received packet has been processed by the client. This function is thread-safe.
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*
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* @param Session Wintun session handle obtained with WintunStartSession
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*
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* @param Packet Packet obtained with WintunReceivePacket
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*/
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typedef void(WINAPI *WINTUN_RECEIVE_RELEASE_FUNC)(_In_ WINTUN_SESSION_HANDLE *Session, _In_ const BYTE *Packet);
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/**
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* Allocates memory for a packet to send. After the memory is filled with packet data, call WintunSendPacket to send
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* and release internal buffer. WintunAllocateSendPacket is thread-safe and the WintunAllocateSendPacket order of
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* calls define the packet sending order.
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*
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* @param Session Wintun session handle obtained with WintunStartSession
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*
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* @param PacketSize Exact packet size. Must be less or equal to WINTUN_MAX_IP_PACKET_SIZE.
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*
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* @param Packet Pointer to receive pointer to memory where to prepare layer 3 IPv4 or IPv6 packet for sending.
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*
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* @return Returns one of the following values:
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* ERROR_HANDLE_EOF Wintun adapter is terminating;
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* ERROR_BUFFER_OVERFLOW Wintun buffer is full;
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* ERROR_SUCCESS on success.
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*/
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typedef WINTUN_STATUS(WINAPI *WINTUN_ALLOCATE_SEND_PACKET_FUNC)(
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_In_ WINTUN_SESSION_HANDLE *Session,
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_In_ DWORD PacketSize,
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_Out_bytecapcount_(PacketSize) BYTE **Packet);
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/**
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* Sends the packet and releases internal buffer. WintunSendPacket is thread-safe, but the WintunAllocateSendPacket
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* order of calls define the packet sending order. This means the packet is not guaranteed to be sent in the
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* WintunSendPacket yet.
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*
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* @param Session Wintun session handle obtained with WintunStartSession
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*
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* @param Packet Packet obtained with WintunAllocateSendPacket
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*/
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typedef void(WINAPI *WINTUN_SEND_PACKET_FUNC)(_In_ WINTUN_SESSION_HANDLE *Session, _In_ const BYTE *Packet);
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#ifdef __cplusplus
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}
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#endif
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