mirror of
https://git.zx2c4.com/wireguard-go
synced 2024-11-15 01:05:15 +01:00
253 lines
7.4 KiB
Go
253 lines
7.4 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2021 WireGuard LLC. All Rights Reserved.
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*/
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package winrio
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import (
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"log"
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"sync"
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"syscall"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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const (
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MsgDontNotify = 1
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MsgDefer = 2
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MsgWaitAll = 4
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MsgCommitOnly = 8
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MaxCqSize = 0x8000000
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invalidBufferId = 0xFFFFFFFF
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invalidCq = 0
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invalidRq = 0
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corruptCq = 0xFFFFFFFF
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)
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var extensionFunctionTable struct {
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cbSize uint32
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rioReceive uintptr
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rioReceiveEx uintptr
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rioSend uintptr
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rioSendEx uintptr
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rioCloseCompletionQueue uintptr
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rioCreateCompletionQueue uintptr
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rioCreateRequestQueue uintptr
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rioDequeueCompletion uintptr
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rioDeregisterBuffer uintptr
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rioNotify uintptr
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rioRegisterBuffer uintptr
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rioResizeCompletionQueue uintptr
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rioResizeRequestQueue uintptr
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}
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type Cq uintptr
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type Rq uintptr
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type BufferId uintptr
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type Buffer struct {
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Id BufferId
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Offset uint32
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Length uint32
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}
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type Result struct {
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Status int32
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BytesTransferred uint32
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SocketContext uint64
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RequestContext uint64
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}
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type notificationCompletionType uint32
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const (
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eventCompletion notificationCompletionType = 1
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iocpCompletion notificationCompletionType = 2
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)
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type eventNotificationCompletion struct {
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completionType notificationCompletionType
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event windows.Handle
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notifyReset uint32
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}
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type iocpNotificationCompletion struct {
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completionType notificationCompletionType
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iocp windows.Handle
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key uintptr
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overlapped *windows.Overlapped
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}
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var initialized sync.Once
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var available bool
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func Initialize() bool {
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initialized.Do(func() {
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var (
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err error
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socket windows.Handle
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cq Cq
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)
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defer func() {
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if err == nil {
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return
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}
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if maj, _, _ := windows.RtlGetNtVersionNumbers(); maj <= 7 {
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return
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}
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log.Printf("Registered I/O is unavailable: %v", err)
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}()
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socket, err = Socket(windows.AF_INET, windows.SOCK_DGRAM, windows.IPPROTO_UDP)
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if err != nil {
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return
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}
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defer windows.CloseHandle(socket)
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var WSAID_MULTIPLE_RIO = &windows.GUID{0x8509e081, 0x96dd, 0x4005, [8]byte{0xb1, 0x65, 0x9e, 0x2e, 0xe8, 0xc7, 0x9e, 0x3f}}
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const SIO_GET_MULTIPLE_EXTENSION_FUNCTION_POINTER = 0xc8000024
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ob := uint32(0)
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err = windows.WSAIoctl(socket, SIO_GET_MULTIPLE_EXTENSION_FUNCTION_POINTER,
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(*byte)(unsafe.Pointer(WSAID_MULTIPLE_RIO)), uint32(unsafe.Sizeof(*WSAID_MULTIPLE_RIO)),
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(*byte)(unsafe.Pointer(&extensionFunctionTable)), uint32(unsafe.Sizeof(extensionFunctionTable)),
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&ob, nil, 0)
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if err != nil {
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return
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}
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// While we should be able to stop here, after getting the function pointers, some anti-virus actually causes
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// failures in RIOCreateRequestQueue, so keep going to be certain this is supported.
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var iocp windows.Handle
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iocp, err = windows.CreateIoCompletionPort(windows.InvalidHandle, 0, 0, 0)
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if err != nil {
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return
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}
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defer windows.CloseHandle(iocp)
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var overlapped windows.Overlapped
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cq, err = CreateIOCPCompletionQueue(2, iocp, 0, &overlapped)
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if err != nil {
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return
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}
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defer CloseCompletionQueue(cq)
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_, err = CreateRequestQueue(socket, 1, 1, 1, 1, cq, cq, 0)
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if err != nil {
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return
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}
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available = true
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})
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return available
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}
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func Socket(af, typ, proto int32) (windows.Handle, error) {
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return windows.WSASocket(af, typ, proto, nil, 0, windows.WSA_FLAG_REGISTERED_IO)
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}
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func CloseCompletionQueue(cq Cq) {
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_, _, _ = syscall.Syscall(extensionFunctionTable.rioCloseCompletionQueue, 1, uintptr(cq), 0, 0)
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}
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func CreateEventCompletionQueue(queueSize uint32, event windows.Handle, notifyReset bool) (Cq, error) {
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notificationCompletion := &eventNotificationCompletion{
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completionType: eventCompletion,
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event: event,
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}
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if notifyReset {
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notificationCompletion.notifyReset = 1
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}
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ret, _, err := syscall.Syscall(extensionFunctionTable.rioCreateCompletionQueue, 2, uintptr(queueSize), uintptr(unsafe.Pointer(notificationCompletion)), 0)
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if ret == invalidCq {
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return 0, err
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}
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return Cq(ret), nil
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}
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func CreateIOCPCompletionQueue(queueSize uint32, iocp windows.Handle, key uintptr, overlapped *windows.Overlapped) (Cq, error) {
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notificationCompletion := &iocpNotificationCompletion{
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completionType: iocpCompletion,
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iocp: iocp,
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key: key,
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overlapped: overlapped,
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}
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ret, _, err := syscall.Syscall(extensionFunctionTable.rioCreateCompletionQueue, 2, uintptr(queueSize), uintptr(unsafe.Pointer(notificationCompletion)), 0)
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if ret == invalidCq {
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return 0, err
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}
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return Cq(ret), nil
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}
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func CreatePolledCompletionQueue(queueSize uint32) (Cq, error) {
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ret, _, err := syscall.Syscall(extensionFunctionTable.rioCreateCompletionQueue, 2, uintptr(queueSize), 0, 0)
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if ret == invalidCq {
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return 0, err
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}
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return Cq(ret), nil
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}
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func CreateRequestQueue(socket windows.Handle, maxOutstandingReceive, maxReceiveDataBuffers, maxOutstandingSend, maxSendDataBuffers uint32, receiveCq, sendCq Cq, socketContext uintptr) (Rq, error) {
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ret, _, err := syscall.Syscall9(extensionFunctionTable.rioCreateRequestQueue, 8, uintptr(socket), uintptr(maxOutstandingReceive), uintptr(maxReceiveDataBuffers), uintptr(maxOutstandingSend), uintptr(maxSendDataBuffers), uintptr(receiveCq), uintptr(sendCq), socketContext, 0)
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if ret == invalidRq {
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return 0, err
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}
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return Rq(ret), nil
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}
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func DequeueCompletion(cq Cq, results []Result) uint32 {
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var array uintptr
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if len(results) > 0 {
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array = uintptr(unsafe.Pointer(&results[0]))
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}
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ret, _, _ := syscall.Syscall(extensionFunctionTable.rioDequeueCompletion, 3, uintptr(cq), array, uintptr(len(results)))
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if ret == corruptCq {
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panic("cq is corrupt")
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}
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return uint32(ret)
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}
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func DeregisterBuffer(id BufferId) {
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_, _, _ = syscall.Syscall(extensionFunctionTable.rioDeregisterBuffer, 1, uintptr(id), 0, 0)
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}
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func RegisterBuffer(buffer []byte) (BufferId, error) {
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var buf unsafe.Pointer
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if len(buffer) > 0 {
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buf = unsafe.Pointer(&buffer[0])
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}
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return RegisterPointer(buf, uint32(len(buffer)))
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}
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func RegisterPointer(ptr unsafe.Pointer, size uint32) (BufferId, error) {
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ret, _, err := syscall.Syscall(extensionFunctionTable.rioRegisterBuffer, 2, uintptr(ptr), uintptr(size), 0)
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if ret == invalidBufferId {
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return 0, err
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}
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return BufferId(ret), nil
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}
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func SendEx(rq Rq, buf *Buffer, dataBufferCount uint32, localAddress, remoteAddress, controlContext, flags *Buffer, sflags uint32, requestContext uintptr) error {
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ret, _, err := syscall.Syscall9(extensionFunctionTable.rioSendEx, 9, uintptr(rq), uintptr(unsafe.Pointer(buf)), uintptr(dataBufferCount), uintptr(unsafe.Pointer(localAddress)), uintptr(unsafe.Pointer(remoteAddress)), uintptr(unsafe.Pointer(controlContext)), uintptr(unsafe.Pointer(flags)), uintptr(sflags), requestContext)
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if ret == 0 {
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return err
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}
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return nil
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}
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func ReceiveEx(rq Rq, buf *Buffer, dataBufferCount uint32, localAddress, remoteAddress, controlContext, flags *Buffer, sflags uint32, requestContext uintptr) error {
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ret, _, err := syscall.Syscall9(extensionFunctionTable.rioReceiveEx, 9, uintptr(rq), uintptr(unsafe.Pointer(buf)), uintptr(dataBufferCount), uintptr(unsafe.Pointer(localAddress)), uintptr(unsafe.Pointer(remoteAddress)), uintptr(unsafe.Pointer(controlContext)), uintptr(unsafe.Pointer(flags)), uintptr(sflags), requestContext)
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if ret == 0 {
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return err
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}
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return nil
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}
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func Notify(cq Cq) error {
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ret, _, _ := syscall.Syscall(extensionFunctionTable.rioNotify, 1, uintptr(cq), 0, 0)
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if ret != 0 {
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return windows.Errno(ret)
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}
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return nil
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}
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