added none congestion control

config/builder.go

@@ -85,13 +85,23 @@ func buildTcp(p *proxy.Proxy, peer Peer) error {
 }
 
 func buildUdp(p *proxy.Proxy, peer Peer) error {
+	var c udp.Congestion
+	switch peer.Congestion {
+	case "None":
+		c = congestion.NewNone()
+	default:
+		fallthrough
+	case "NewReno":
+		c = congestion.NewNewReno()
+	}
+
 	if peer.RemoteHost != "" {
 		f, err := udp.InitiateFlow(
 			fmt.Sprintf("%s:", peer.LocalHost),
 			fmt.Sprintf("%s:%d", peer.RemoteHost, peer.RemotePort),
 			UselessMac{},
 			UselessMac{},
-			congestion.NewNewReno(),
+			c,
 			time.Duration(peer.KeepAlive)*time.Second,
 		)
 
@@ -110,7 +120,7 @@ func buildUdp(p *proxy.Proxy, peer Peer) error {
 		fmt.Sprintf("%s:%d", peer.LocalHost, peer.LocalPort),
 		UselessMac{},
 		UselessMac{},
-		congestion.NewNewReno(),
+		c,
 	)
 	if err != nil {
 		return err

config/config.go

@@ -24,6 +24,8 @@ type Peer struct {
 	RemoteHost string `validate:"required_with=RemotePort,omitempty,fqdn|ip"`
 	RemotePort uint   `validate:"required_with=RemoteHost,omitempty,max=65535"`
 
+	Congestion string `validate:"oneof=NewReno None"`
+
 	KeepAlive uint
 	Timeout   uint
 	RetryWait uint

udp/congestion/none.go

@@ -0,0 +1,40 @@
+package congestion
+
+import "time"
+
+type None struct {
+	sequence chan uint32
+}
+
+func NewNone() *None {
+	c := None{
+		sequence: make(chan uint32),
+	}
+
+	go func() {
+		var s uint32
+		for {
+			if s == 0 {
+				continue
+			}
+
+			c.sequence <- s
+			s++
+		}
+	}()
+
+	return &c
+}
+
+func (c *None) Sequence() uint32 {
+	return <-c.sequence
+}
+
+func (c *None) ReceivedPacket(seq uint32) {}
+func (c *None) ReceivedAck(uint32)        {}
+func (c *None) NextAck() uint32           { return 0 }
+func (c *None) ReceivedNack(uint32)       {}
+func (c *None) NextNack() uint32          { return 0 }
+func (c *None) AwaitEarlyUpdate(keepalive time.Duration) {
+	select {}
+}