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