fix some races and GetBytes/PutBytes usage, but this still seems to deadlock somewhere in iperf tests

src/tuntap/conn.go

@@ -3,6 +3,7 @@ package tuntap
 import (
 	"errors"
 
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 	"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
 )
 
@@ -40,7 +41,7 @@ func (s *tunConn) reader() error {
 		select {
 		case <-read:
 			if n > 0 {
-				s.tun.send <- b[:n]
+				s.tun.send <- append(util.GetBytes(), b[:n]...)
 			}
 		case <-s.stop:
 			s.tun.log.Debugln("Stopping conn reader for", s)
@@ -68,8 +69,8 @@ func (s *tunConn) writer() error {
 			}
 			if _, err := s.conn.Write(b); err != nil {
 				s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn write error:", err)
-				continue
 			}
+			util.PutBytes(b)
 		}
 	}
 }

src/tuntap/iface.go

@@ -95,6 +95,7 @@ func (tun *TunAdapter) writer() error {
 			}
 		} else {
 			w, err = tun.iface.Write(b[:n])
+			util.PutBytes(b)
 		}
 		if err != nil {
 			tun.log.Errorln("TUN/TAP iface write error:", err)
@@ -219,9 +220,11 @@ func (tun *TunAdapter) reader() error {
 		}
 		// If we have a connection now, try writing to it
 		if isIn && session != nil {
+			packet := append(util.GetBytes(), bs[:n]...)
 			select {
-			case session.send <- bs[:n]:
+			case session.send <- packet:
 			default:
+				util.PutBytes(packet)
 			}
 		}