make sure the only place traffic is ever dropped is in the switch. this currently disables the dedicated crypto workers

src/yggdrasil/link.go

@@ -216,8 +216,8 @@ func (intf *linkInterface) handler() error {
 				case signalReady <- struct{}{}:
 				default:
 				}
-				intf.link.core.log.Debugf("Sending packet to %s: %s, source %s",
-					strings.ToUpper(intf.info.linkType), themString, intf.info.local)
+				//intf.link.core.log.Debugf("Sending packet to %s: %s, source %s",
+				//	strings.ToUpper(intf.info.linkType), themString, intf.info.local)
 			}
 		}
 	}()
@@ -237,9 +237,9 @@ func (intf *linkInterface) handler() error {
 		recvTimer := time.NewTimer(recvTime)
 		defer util.TimerStop(recvTimer)
 		for {
-			intf.link.core.log.Debugf("State of %s: %s, source %s :: isAlive %t isReady %t sendTimerRunning %t recvTimerRunning %t",
-				strings.ToUpper(intf.info.linkType), themString, intf.info.local,
-				isAlive, isReady, sendTimerRunning, recvTimerRunning)
+			//intf.link.core.log.Debugf("State of %s: %s, source %s :: isAlive %t isReady %t sendTimerRunning %t recvTimerRunning %t",
+			//	strings.ToUpper(intf.info.linkType), themString, intf.info.local,
+			//	isAlive, isReady, sendTimerRunning, recvTimerRunning)
 			select {
 			case gotMsg, ok := <-signalAlive:
 				if !ok {

src/yggdrasil/router.go

@@ -68,17 +68,34 @@ func (r *router) init(core *Core) {
 	r.subnet = *address.SubnetForNodeID(&r.core.dht.nodeID)
 	in := make(chan []byte, 32) // TODO something better than this...
 	p := r.core.peers.newPeer(&r.core.boxPub, &r.core.sigPub, &crypto.BoxSharedKey{}, "(self)", nil)
-	p.out = func(packet []byte) {
-		// This is to make very sure it never blocks
-		select {
-		case in <- packet:
-			return
-		default:
-			util.PutBytes(packet)
-		}
-	}
+	p.out = func(packet []byte) { in <- packet }
 	r.in = in
-	r.out = func(packet []byte) { p.handlePacket(packet) } // The caller is responsible for go-ing if it needs to not block
+	out := make(chan []byte, 32)
+	go func() {
+		for packet := range out {
+			p.handlePacket(packet)
+		}
+	}()
+	out2 := make(chan []byte, 32)
+	go func() {
+		// This worker makes sure r.out never blocks
+		// It will buffer traffic long enough for the switch worker to take it
+		// If (somehow) you can send faster than the switch can receive, then this would use unbounded memory
+		// But crypto slows sends enough that the switch should always be able to take the packets...
+		var buf [][]byte
+		for {
+			buf = append(buf, <-out2)
+			for len(buf) > 0 {
+				select {
+				case bs := <-out2:
+					buf = append(buf, bs)
+				case out <- buf[0]:
+					buf = buf[1:]
+				}
+			}
+		}
+	}()
+	r.out = func(packet []byte) { out2 <- packet }
 	r.toRecv = make(chan router_recvPacket, 32)
 	recv := make(chan []byte, 32)
 	send := make(chan []byte, 32)
@@ -306,6 +323,8 @@ func (r *router) sendPacket(bs []byte) {
 			return
 		}
 
+		sinfo.doSend(bs)
+		return
 		sinfo.send <- bs
 	}
 }
@@ -385,6 +404,8 @@ func (r *router) handleTraffic(packet []byte) {
 	if !isIn {
 		return
 	}
+	sinfo.doRecv(&p)
+	return
 	sinfo.recv <- &p
 }
 

src/yggdrasil/session.go

@@ -304,7 +304,7 @@ func (ss *sessions) createSession(theirPermKey *crypto.BoxPubKey) *sessionInfo {
 	sinfo.theirSubnet = *address.SubnetForNodeID(crypto.GetNodeID(&sinfo.theirPermPub))
 	sinfo.send = make(chan []byte, 32)
 	sinfo.recv = make(chan *wire_trafficPacket, 32)
-	go sinfo.doWorker()
+	//go sinfo.doWorker()
 	ss.sinfos[sinfo.myHandle] = &sinfo
 	ss.byMySes[sinfo.mySesPub] = &sinfo.myHandle
 	ss.byTheirPerm[sinfo.theirPermPub] = &sinfo.myHandle
@@ -625,6 +625,8 @@ func (sinfo *sessionInfo) doRecv(p *wire_trafficPacket) {
 	sinfo.updateNonce(&p.Nonce)
 	sinfo.time = time.Now()
 	sinfo.bytesRecvd += uint64(len(bs))
+	sinfo.core.router.recvPacket(bs, sinfo)
+	return
 	select {
 	case sinfo.core.router.toRecv <- router_recvPacket{bs, sinfo}:
 	default: // avoid deadlocks, maybe do this somewhere else?...

src/yggdrasil/switch.go

@@ -668,10 +668,12 @@ func (t *switchTable) handleIn(packet []byte, idle map[switchPort]struct{}) bool
 			//nothing
 		case coordLen < bestCoordLen:
 			update = true
-		case coordLen > bestCoordLen:
-			//nothing
-		case port < best.port:
-			update = true
+			/*
+				case coordLen > bestCoordLen:
+					//nothing
+				case port < best.port:
+					update = true
+			*/
 		default:
 			//nothing
 		}
@@ -800,7 +802,7 @@ func (t *switchTable) doWorker() {
 	t.queues.bufs = make(map[string]switch_buffer) // Packets per PacketStreamID (string)
 	idle := make(map[switchPort]struct{})          // this is to deduplicate things
 	for {
-		t.core.log.Debugf("Switch state: idle = %d, buffers = %d", len(idle), len(t.queues.bufs))
+		//t.core.log.Debugf("Switch state: idle = %d, buffers = %d", len(idle), len(t.queues.bufs))
 		select {
 		case bytes := <-t.packetIn:
 			// Try to send it somewhere (or drop it if it's corrupt or at a dead end)