wintun: ring management moved to wintun.dll
Signed-off-by: Simon Rozman <simon@rozman.si> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Simon Rozman
committed by
Jason A. Donenfeld
Jason A. Donenfeld
parent
65e03a9182
commit
a3b231b31e
@@ -1,117 +0,0 @@
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/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2020 WireGuard LLC. All Rights Reserved.
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*/
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package wintun
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import (
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"runtime"
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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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PacketAlignment = 4 // Number of bytes packets are aligned to in rings
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PacketSizeMax = 0xffff // Maximum packet size
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PacketCapacity = 0x800000 // Ring capacity, 8MiB
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PacketTrailingSize = uint32(unsafe.Sizeof(PacketHeader{})) + ((PacketSizeMax + (PacketAlignment - 1)) &^ (PacketAlignment - 1)) - PacketAlignment
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ioctlRegisterRings = (51820 << 16) | (0x970 << 2) | 0 /*METHOD_BUFFERED*/ | (0x3 /*FILE_READ_DATA | FILE_WRITE_DATA*/ << 14)
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)
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type PacketHeader struct {
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Size uint32
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}
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type Packet struct {
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PacketHeader
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Data [PacketSizeMax]byte
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}
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type Ring struct {
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Head uint32
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Tail uint32
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Alertable int32
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Data [PacketCapacity + PacketTrailingSize]byte
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}
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type RingDescriptor struct {
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Send, Receive struct {
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Size uint32
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Ring *Ring
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TailMoved windows.Handle
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}
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}
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// Wrap returns value modulo ring capacity
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func (rb *Ring) Wrap(value uint32) uint32 {
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return value & (PacketCapacity - 1)
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}
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// Aligns a packet size to PacketAlignment
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func PacketAlign(size uint32) uint32 {
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return (size + (PacketAlignment - 1)) &^ (PacketAlignment - 1)
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}
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func NewRingDescriptor() (descriptor *RingDescriptor, err error) {
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descriptor = new(RingDescriptor)
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allocatedRegion, err := windows.VirtualAlloc(0, unsafe.Sizeof(Ring{})*2, windows.MEM_COMMIT|windows.MEM_RESERVE, windows.PAGE_READWRITE)
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if err != nil {
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return
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}
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defer func() {
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if err != nil {
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descriptor.free()
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descriptor = nil
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}
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}()
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descriptor.Send.Size = uint32(unsafe.Sizeof(Ring{}))
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descriptor.Send.Ring = (*Ring)(unsafe.Pointer(allocatedRegion))
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descriptor.Send.TailMoved, err = windows.CreateEvent(nil, 0, 0, nil)
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if err != nil {
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return
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}
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descriptor.Receive.Size = uint32(unsafe.Sizeof(Ring{}))
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descriptor.Receive.Ring = (*Ring)(unsafe.Pointer(allocatedRegion + unsafe.Sizeof(Ring{})))
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descriptor.Receive.TailMoved, err = windows.CreateEvent(nil, 0, 0, nil)
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if err != nil {
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windows.CloseHandle(descriptor.Send.TailMoved)
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return
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}
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runtime.SetFinalizer(descriptor, func(d *RingDescriptor) { d.free() })
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return
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}
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func (descriptor *RingDescriptor) free() {
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if descriptor.Send.Ring != nil {
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windows.VirtualFree(uintptr(unsafe.Pointer(descriptor.Send.Ring)), 0, windows.MEM_RELEASE)
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descriptor.Send.Ring = nil
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descriptor.Receive.Ring = nil
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}
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}
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func (descriptor *RingDescriptor) Close() {
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if descriptor.Send.TailMoved != 0 {
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windows.CloseHandle(descriptor.Send.TailMoved)
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descriptor.Send.TailMoved = 0
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}
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if descriptor.Send.TailMoved != 0 {
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windows.CloseHandle(descriptor.Receive.TailMoved)
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descriptor.Receive.TailMoved = 0
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}
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}
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func (wintun *Adapter) Register(descriptor *RingDescriptor) (windows.Handle, error) {
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handle, err := wintun.OpenAdapterDeviceObject()
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if err != nil {
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return 0, err
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}
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var bytesReturned uint32
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err = windows.DeviceIoControl(handle, ioctlRegisterRings, (*byte)(unsafe.Pointer(descriptor)), uint32(unsafe.Sizeof(*descriptor)), nil, 0, &bytesReturned, nil)
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if err != nil {
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return 0, err
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}
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return handle, nil
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}
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108
tun/wintun/session_windows.go
Normal file
108
tun/wintun/session_windows.go
Normal file
@@ -0,0 +1,108 @@
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/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2020 WireGuard LLC. All Rights Reserved.
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*/
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package wintun
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import (
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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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type Session struct {
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handle uintptr
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}
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const (
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PacketSizeMax = 0xffff // Maximum packet size
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RingCapacityMin = 0x20000 // Minimum ring capacity (128 kiB)
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RingCapacityMax = 0x4000000 // Maximum ring capacity (64 MiB)
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)
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// Packet with data
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type Packet struct {
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Next *Packet // Pointer to next packet in queue
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Size uint32 // Size of packet (max WINTUN_MAX_IP_PACKET_SIZE)
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Data *[PacketSizeMax]byte // Pointer to layer 3 IPv4 or IPv6 packet
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}
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var (
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procWintunAllocateSendPacket = modwintun.NewProc("WintunAllocateSendPacket").Addr()
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procWintunEndSession = modwintun.NewProc("WintunEndSession")
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procWintunGetReadWaitEvent = modwintun.NewProc("WintunGetReadWaitEvent")
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procWintunReceivePacket = modwintun.NewProc("WintunReceivePacket").Addr()
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procWintunReleaseReceivePacket = modwintun.NewProc("WintunReleaseReceivePacket").Addr()
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procWintunSendPacket = modwintun.NewProc("WintunSendPacket").Addr()
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procWintunStartSession = modwintun.NewProc("WintunStartSession")
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)
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func (wintun *Adapter) StartSession(capacity uint32) (session Session, err error) {
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r0, _, e1 := syscall.Syscall(procWintunStartSession.Addr(), 2, uintptr(wintun.handle), uintptr(capacity), 0)
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if r0 == 0 {
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err = e1
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} else {
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session = Session{r0}
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}
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return
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}
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func (session Session) End() {
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syscall.Syscall(procWintunEndSession.Addr(), 1, session.handle, 0, 0)
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session.handle = 0
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}
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func (session Session) ReadWaitEvent() (handle windows.Handle) {
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r0, _, _ := syscall.Syscall(procWintunGetReadWaitEvent.Addr(), 1, session.handle, 0, 0)
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handle = windows.Handle(r0)
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return
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}
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func (session Session) ReceivePacket() (packet []byte, err error) {
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var packetSize uint32
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r0, _, e1 := syscall.Syscall(procWintunReceivePacket, 2, session.handle, uintptr(unsafe.Pointer(&packetSize)), 0)
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if r0 == 0 {
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err = e1
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return
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}
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unsafeSlice(unsafe.Pointer(&packet), unsafe.Pointer(r0), int(packetSize))
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return
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}
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func (session Session) ReleaseReceivePacket(packet []byte) {
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syscall.Syscall(procWintunReleaseReceivePacket, 2, session.handle, uintptr(unsafe.Pointer(&packet[0])), 0)
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}
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func (session Session) AllocateSendPacket(packetSize int) (packet []byte, err error) {
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r0, _, e1 := syscall.Syscall(procWintunAllocateSendPacket, 2, session.handle, uintptr(packetSize), 0)
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if r0 == 0 {
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err = e1
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return
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}
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unsafeSlice(unsafe.Pointer(&packet), unsafe.Pointer(r0), int(packetSize))
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return
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}
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func (session Session) SendPacket(packet []byte) {
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syscall.Syscall(procWintunSendPacket, 2, session.handle, uintptr(unsafe.Pointer(&packet[0])), 0)
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}
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// unsafeSlice updates the slice slicePtr to be a slice
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// referencing the provided data with its length & capacity set to
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// lenCap.
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//
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// TODO: when Go 1.16 or Go 1.17 is the minimum supported version,
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// update callers to use unsafe.Slice instead of this.
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func unsafeSlice(slicePtr, data unsafe.Pointer, lenCap int) {
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type sliceHeader struct {
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Data unsafe.Pointer
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Len int
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Cap int
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}
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h := (*sliceHeader)(slicePtr)
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h.Data = data
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h.Len = lenCap
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h.Cap = lenCap
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}
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@@ -45,7 +45,6 @@ var (
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procWintunGetAdapterLUID = modwintun.NewProc("WintunGetAdapterLUID")
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procWintunGetAdapterName = modwintun.NewProc("WintunGetAdapterName")
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procWintunGetRunningDriverVersion = modwintun.NewProc("WintunGetRunningDriverVersion")
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procWintunOpenAdapterDeviceObject = modwintun.NewProc("WintunOpenAdapterDeviceObject")
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procWintunSetAdapterName = modwintun.NewProc("WintunSetAdapterName")
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procWintunSetLogger = modwintun.NewProc("WintunSetLogger")
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)
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@@ -210,16 +209,6 @@ func RunningVersion() (version uint32, err error) {
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return
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}
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// handle returns a handle to the adapter device object. Release handle with windows.CloseHandle
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func (wintun *Adapter) OpenAdapterDeviceObject() (handle windows.Handle, err error) {
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r0, _, e1 := syscall.Syscall(procWintunOpenAdapterDeviceObject.Addr(), 1, uintptr(wintun.handle), 0, 0)
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handle = windows.Handle(r0)
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if handle == windows.InvalidHandle {
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err = e1
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}
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return
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}
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// LUID returns the LUID of the adapter.
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func (wintun *Adapter) LUID() (luid uint64) {
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syscall.Syscall(procWintunGetAdapterLUID.Addr(), 2, uintptr(wintun.handle), uintptr(unsafe.Pointer(&luid)), 0)
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