From 40f5d9cc44305fed7ed64cf1d2e26e4c360d2e0d Mon Sep 17 00:00:00 2001
From: Mikael Magnusson <mikma@users.sourceforge.net>
Date: Thu, 19 Mar 2020 18:42:00 +0100
Subject: WIP add tuntap fd

---
 pkg/tcpip/config/config.go | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/pkg/tcpip/config/config.go b/pkg/tcpip/config/config.go
index d021bf6a3..4eb0eacaf 100644
--- a/pkg/tcpip/config/config.go
+++ b/pkg/tcpip/config/config.go
@@ -62,6 +62,7 @@ type Tuntap struct {
 	Common `yaml:",inline"`
 	Mode string `yaml:"mode"`
 	Name string `yaml:"name"`
+	Fd int `yaml:"fd"`
 }
 
 type WireguardKey []byte
@@ -163,13 +164,17 @@ func addTunLink(s *stack.Stack, nic tcpip.NICID, id string, tap bool, addr tcpip
 	}
 
 	var fd int
-	if tap {
-		fd, err = tun.OpenTAP(tunName)
+	if tuntap.Fd != 0 {
+		fd = tuntap.Fd
 	} else {
-		fd, err = tun.Open(tunName)
-	}
-	if err != nil {
-		log.Fatalf("Open %s %b %s", err, tap, tunName)
+		if tap {
+			fd, err = tun.OpenTAP(tunName)
+		} else {
+			fd, err = tun.Open(tunName)
+		}
+		if err != nil {
+			log.Fatalf("Open %s %b %s", err, tap, tunName)
+		}
 	}
 
 	linkEP, err := fdbased.New(&fdbased.Options{
-- 
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