271 lines
10 KiB
C
271 lines
10 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 OR MIT
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*
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* Copyright (C) 2018-2021 WireGuard LLC. All Rights Reserved.
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*/
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#pragma once
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#include <winsock2.h>
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#include <windows.h>
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#include <ipexport.h>
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#include <ifdef.h>
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#include <ws2ipdef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef ALIGNED
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# if defined(_MSC_VER)
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# define ALIGNED(n) __declspec(align(n))
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# elif defined(__GNUC__)
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# define ALIGNED(n) __attribute__((aligned(n)))
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# else
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# error "Unable to define ALIGNED"
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# endif
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#endif
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/* MinGW is missing this one, unfortunately. */
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#ifndef _Post_maybenull_
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# define _Post_maybenull_
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#endif
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#pragma warning(push)
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#pragma warning(disable : 4324) /* structure was padded due to alignment specifier */
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/**
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* A handle representing Wintun adapter
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*/
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typedef struct _WINTUN_ADAPTER *WINTUN_ADAPTER_HANDLE;
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/**
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* Creates a new Wintun adapter.
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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 TunnelType Name of the adapter tunnel type. 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 deterministically.
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* If it is set to NULL, the GUID is chosen by the system at random, and hence a new NLA entry is
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* created for each new adapter. It is called "requested" GUID because the API it uses is
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* completely undocumented, and so there could be minor interesting complications with its usage.
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*
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* @return If the function succeeds, the return value is the adapter handle. Must be released with
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* WintunCloseAdapter. If the function fails, the return value is NULL. To get extended error information, call
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* GetLastError.
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*/
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typedef _Must_inspect_result_
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_Return_type_success_(return != NULL)
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_Post_maybenull_
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WINTUN_ADAPTER_HANDLE(WINAPI WINTUN_CREATE_ADAPTER_FUNC)
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(_In_z_ LPCWSTR Name, _In_z_ LPCWSTR TunnelType, _In_opt_ const GUID *RequestedGUID);
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/**
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* Opens an existing Wintun adapter.
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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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* @return If the function succeeds, the return value is the adapter handle. Must be released with
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* WintunCloseAdapter. If the function fails, the return value is NULL. To get extended error information, call
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* GetLastError.
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*/
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typedef _Must_inspect_result_
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_Return_type_success_(return != NULL)
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_Post_maybenull_
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WINTUN_ADAPTER_HANDLE(WINAPI WINTUN_OPEN_ADAPTER_FUNC)(_In_z_ LPCWSTR Name);
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/**
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* Releases Wintun adapter resources and, if adapter was created with WintunCreateAdapter, removes adapter.
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*
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* @param Adapter Adapter handle obtained with WintunCreateAdapter or WintunOpenAdapter.
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*/
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typedef VOID(WINAPI WINTUN_CLOSE_ADAPTER_FUNC)(_In_opt_ WINTUN_ADAPTER_HANDLE Adapter);
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/**
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* Deletes the Wintun driver if there are no more adapters in use.
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*
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* @return If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To
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* get extended error information, call GetLastError.
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*/
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typedef _Return_type_success_(return != FALSE)
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BOOL(WINAPI WINTUN_DELETE_DRIVER_FUNC)(VOID);
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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 WintunCreateAdapter or WintunOpenAdapter
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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_ NET_LUID *Luid);
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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 If the function succeeds, the return value is the version number. If the function fails, the return value is
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* zero. To get extended error information, call GetLastError. Possible errors include the following:
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* ERROR_FILE_NOT_FOUND Wintun not loaded
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*/
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typedef _Return_type_success_(return != 0)
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DWORD(WINAPI WINTUN_GET_RUNNING_DRIVER_VERSION_FUNC)(VOID);
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/**
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* Determines the level of logging, passed to WINTUN_LOGGER_CALLBACK.
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*/
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typedef enum
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{
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WINTUN_LOG_INFO, /**< Informational */
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WINTUN_LOG_WARN, /**< Warning */
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WINTUN_LOG_ERR /**< Error */
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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 Timestamp Message timestamp in in 100ns intervals since 1601-01-01 UTC.
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*
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* @param Message Message text.
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*/
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typedef VOID(CALLBACK *WINTUN_LOGGER_CALLBACK)(
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_In_ WINTUN_LOGGER_LEVEL Level,
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_In_ DWORD64 Timestamp,
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_In_z_ LPCWSTR 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. Set to NULL to disable.
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*/
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typedef VOID(WINAPI WINTUN_SET_LOGGER_FUNC)(_In_ WINTUN_LOGGER_CALLBACK 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 struct _TUN_SESSION *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 WintunOpenAdapter 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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* @return Wintun session handle. Must be released with WintunEndSession. If the function fails, the return value is
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* NULL. To get extended error information, call GetLastError.
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*/
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typedef _Must_inspect_result_
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_Return_type_success_(return != NULL)
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_Post_maybenull_
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WINTUN_SESSION_HANDLE(WINAPI WINTUN_START_SESSION_FUNC)(_In_ WINTUN_ADAPTER_HANDLE Adapter, _In_ DWORD Capacity);
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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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* Gets Wintun session's read-wait event handle.
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*
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* @param Session Wintun session handle obtained with WintunStartSession
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*
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* @return 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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typedef HANDLE(WINAPI WINTUN_GET_READ_WAIT_EVENT_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 WintunReleaseReceivePacket 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 PacketSize Pointer to receive packet size.
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*
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* @return Pointer to layer 3 IPv4 or IPv6 packet. Client may modify its content at will. If the function fails, the
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* return value is NULL. To get extended error information, call GetLastError. Possible errors include the
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* following:
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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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*/
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typedef _Must_inspect_result_
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_Return_type_success_(return != NULL)
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_Post_maybenull_
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_Post_writable_byte_size_(*PacketSize)
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BYTE *(WINAPI WINTUN_RECEIVE_PACKET_FUNC)(_In_ WINTUN_SESSION_HANDLE Session, _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(
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WINAPI WINTUN_RELEASE_RECEIVE_PACKET_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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* @return Returns pointer to memory where to prepare layer 3 IPv4 or IPv6 packet for sending. If the function fails,
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* the return value is NULL. To get extended error information, call GetLastError. Possible errors include the
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* following:
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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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*/
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typedef _Must_inspect_result_
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_Return_type_success_(return != NULL)
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_Post_maybenull_
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_Post_writable_byte_size_(PacketSize)
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BYTE *(WINAPI WINTUN_ALLOCATE_SEND_PACKET_FUNC)(_In_ WINTUN_SESSION_HANDLE Session, _In_ DWORD PacketSize);
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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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#pragma warning(pop)
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#ifdef __cplusplus
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}
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#endif
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