snow/wireguard-go
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Improved throughput

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- Improved performance by adding the message buffers to a sync.Pool.
- Fixed issue with computing "next" key-pair upon
  receiving a response message.
This commit is contained in:
Mathias Hall-Andersen 2017-07-14 14:25:18 +02:00
parent 0043008ad0
commit 8993b3927c
4 changed files with 79 additions and 41 deletions
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20
src/device.go
View file

@ -11,6 +11,10 @@ type Device struct {
log *Logger // collection of loggers for levels
idCounter uint // for assigning debug ids to peers
fwMark uint32
pool struct {
// pools objects for reuse
messageBuffers sync.Pool
}
net struct {
// seperate for performance reasons
mutex sync.RWMutex
@ -57,6 +61,14 @@ func (device *Device) SetPrivateKey(sk NoisePrivateKey) {
}
}
func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte {
return device.pool.messageBuffers.Get().(*[MaxMessageSize]byte)
}
func (device *Device) PutMessageBuffer(msg *[MaxMessageSize]byte) {
device.pool.messageBuffers.Put(msg)
}
func NewDevice(tun TUNDevice, logLevel int) *Device {
device := new(Device)
@ -78,6 +90,14 @@ func NewDevice(tun TUNDevice, logLevel int) *Device {
device.net.addr, _ = net.ResolveUDPAddr(addr.Network(), addr.String())
device.net.mutex.Unlock()
// setup pools
device.pool.messageBuffers = sync.Pool{
New: func() interface{} {
return new([MaxMessageSize]byte)
},
}
// create queues
device.queue.handshake = make(chan QueueHandshakeElement, QueueHandshakeSize)

57
src/receive.go
View file

@ -15,12 +15,14 @@ import (
type QueueHandshakeElement struct {
msgType uint32
packet []byte
buffer *[MaxMessageSize]byte
source *net.UDPAddr
}
type QueueInboundElement struct {
dropped int32
mutex sync.Mutex
buffer *[MaxMessageSize]byte
packet []byte
counter uint64
keyPair *KeyPair
@ -34,7 +36,7 @@ func (elem *QueueInboundElement) IsDropped() bool {
return atomic.LoadInt32(&elem.dropped) == AtomicTrue
}
func addToInboundQueue(
func (device *Device) addToInboundQueue(
queue chan *QueueInboundElement,
element *QueueInboundElement,
) {
@ -52,7 +54,7 @@ func addToInboundQueue(
}
}
func addToHandshakeQueue(
func (device *Device) addToHandshakeQueue(
queue chan QueueHandshakeElement,
element QueueHandshakeElement,
) {
@ -62,7 +64,8 @@ func addToHandshakeQueue(
return
default:
select {
case <-queue:
case elem := <-queue:
device.PutMessageBuffer(elem.buffer)
default:
}
}
@ -70,9 +73,6 @@ func addToHandshakeQueue(
}
/* Routine determining the busy state of the interface
*
* TODO: prehaps nicer to do this in response to events
* TODO: more well reasoned definition of "busy"
*/
func (device *Device) RoutineBusyMonitor() {
samples := 0
@ -109,10 +109,11 @@ func (device *Device) RoutineBusyMonitor() {
func (device *Device) RoutineReceiveIncomming() {
logInfo := device.log.Info
logDebug := device.log.Debug
logDebug.Println("Routine, receive incomming, started")
var buffer []byte
var buffer *[MaxMessageSize]byte
for {
@ -127,7 +128,7 @@ func (device *Device) RoutineReceiveIncomming() {
// read next datagram
if buffer == nil {
buffer = make([]byte, MaxMessageSize)
buffer = device.GetMessageBuffer()
}
device.net.mutex.RLock()
@ -140,7 +141,7 @@ func (device *Device) RoutineReceiveIncomming() {
conn.SetReadDeadline(time.Now().Add(time.Second))
size, raddr, err := conn.ReadFromUDP(buffer)
size, raddr, err := conn.ReadFromUDP(buffer[:])
if err != nil || size < MinMessageSize {
continue
}
@ -157,10 +158,11 @@ func (device *Device) RoutineReceiveIncomming() {
// add to handshake queue
addToHandshakeQueue(
device.addToHandshakeQueue(
device.queue.handshake,
QueueHandshakeElement{
msgType: msgType,
buffer: buffer,
packet: packet,
source: raddr,
},
@ -210,21 +212,22 @@ func (device *Device) RoutineReceiveIncomming() {
// add to peer queue
peer := value.peer
work := new(QueueInboundElement)
work.packet = packet
work.keyPair = keyPair
work.dropped = AtomicFalse
work := &QueueInboundElement{
packet: packet,
buffer: buffer,
keyPair: keyPair,
dropped: AtomicFalse,
}
work.mutex.Lock()
// add to decryption queues
addToInboundQueue(device.queue.decryption, work)
addToInboundQueue(peer.queue.inbound, work)
device.addToInboundQueue(device.queue.decryption, work)
device.addToInboundQueue(peer.queue.inbound, work)
buffer = nil
default:
// unknown message type
logDebug.Println("Got unknown message from:", raddr)
logInfo.Println("Got unknown message from:", raddr)
}
}()
}
@ -261,7 +264,12 @@ func (device *Device) RoutineDecryption() {
var err error
copy(nonce[4:], counter)
elem.counter = binary.LittleEndian.Uint64(counter)
elem.packet, err = elem.keyPair.receive.Open(elem.packet[:0], nonce[:], content, nil)
elem.packet, err = elem.keyPair.receive.Open(
elem.buffer[:0],
nonce[:],
content,
nil,
)
if err != nil {
elem.Drop()
}
@ -373,12 +381,16 @@ func (device *Device) RoutineHandshake() {
logDebug.Println("Creating response message for", peer.String())
outElem := device.NewOutboundElement()
writer := bytes.NewBuffer(outElem.data[:0])
writer := bytes.NewBuffer(outElem.buffer[:0])
binary.Write(writer, binary.LittleEndian, response)
outElem.packet = writer.Bytes()
peer.mac.AddMacs(outElem.packet)
addToOutboundQueue(peer.queue.outbound, outElem)
// create new keypair
peer.NewKeyPair()
case MessageResponseType:
// unmarshal
@ -414,7 +426,7 @@ func (device *Device) RoutineHandshake() {
peer.EventHandshakeComplete()
default:
device.log.Error.Println("Invalid message type in handshake queue")
logError.Println("Invalid message type in handshake queue")
}
}()
}
@ -529,7 +541,7 @@ func (peer *Peer) RoutineSequentialReceiver() {
}
atomic.AddUint64(&peer.rxBytes, uint64(len(elem.packet)))
addToInboundQueue(device.queue.inbound, elem)
device.addToInboundQueue(device.queue.inbound, elem)
}()
}
}
@ -546,6 +558,7 @@ func (device *Device) RoutineWriteToTUN(tun TUNDevice) {
return
case elem := <-device.queue.inbound:
_, err := tun.Write(elem.packet)
device.PutMessageBuffer(elem.buffer)
if err != nil {
logError.Println("Failed to write packet to TUN device:", err)
}

31
src/send.go
View file

@ -33,7 +33,7 @@ import (
type QueueOutboundElement struct {
dropped int32
mutex sync.Mutex
data [MaxMessageSize]byte // slice holding the packet data
buffer *[MaxMessageSize]byte // slice holding the packet data
packet []byte // slice of "data" (always!)
nonce uint64 // nonce for encryption
keyPair *KeyPair // key-pair for encryption
@ -51,13 +51,11 @@ func (peer *Peer) FlushNonceQueue() {
}
}
/*
* Assumption: The mutex of the returned element is released
*/
func (device *Device) NewOutboundElement() *QueueOutboundElement {
// TODO: profile, consider sync.Pool
elem := new(QueueOutboundElement)
return elem
return &QueueOutboundElement{
dropped: AtomicFalse,
buffer: device.pool.messageBuffers.Get().(*[MaxMessageSize]byte),
}
}
func (elem *QueueOutboundElement) Drop() {
@ -130,7 +128,7 @@ func (device *Device) RoutineReadFromTUN(tun TUNDevice) {
elem = device.NewOutboundElement()
}
elem.packet = elem.data[MessageTransportHeaderSize:]
elem.packet = elem.buffer[MessageTransportHeaderSize:]
size, err := tun.Read(elem.packet)
if err != nil {
@ -284,7 +282,7 @@ func (device *Device) RoutineEncryption() {
// populate header fields
func() {
header := work.data[:MessageTransportHeaderSize]
header := work.buffer[:MessageTransportHeaderSize]
fieldType := header[0:4]
fieldReceiver := header[4:8]
@ -305,7 +303,7 @@ func (device *Device) RoutineEncryption() {
nil,
)
length := MessageTransportHeaderSize + len(work.packet)
work.packet = work.data[:length]
work.packet = work.buffer[:length]
work.mutex.Unlock()
// refresh key if necessary
@ -333,12 +331,16 @@ func (peer *Peer) RoutineSequentialSender() {
case work := <-peer.queue.outbound:
work.mutex.Lock()
if work.IsDropped() {
continue
}
func() {
// return buffer to pool after processing
defer device.PutMessageBuffer(work.buffer)
if work.IsDropped() {
return
}
// send to endpoint
peer.mutex.RLock()
@ -357,10 +359,13 @@ func (peer *Peer) RoutineSequentialSender() {
return
}
// send message and return buffer to pool
_, err := device.net.conn.WriteToUDP(work.packet, peer.endpoint)
if err != nil {
return
}
atomic.AddUint64(&peer.txBytes, uint64(len(work.packet)))
// reset keep-alive

2
src/timers.go
View file

@ -128,7 +128,7 @@ func (peer *Peer) BeginHandshakeInitiation() (*QueueOutboundElement, error) {
// marshal & schedule for sending
writer := bytes.NewBuffer(elem.data[:0])
writer := bytes.NewBuffer(elem.buffer[:0])
binary.Write(writer, binary.LittleEndian, msg)
elem.packet = writer.Bytes()
peer.mac.AddMacs(elem.packet)