From 858f933917014f710343aea93f2b643f5e05dfec Mon Sep 17 00:00:00 2001
From: Mikael Magnusson <mikma@users.sourceforge.net>
Date: Wed, 3 Feb 2021 23:00:36 +0100
Subject: WIP: use zone as nic, default to 0

---
 tun/netstack/tun.go | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/tun/netstack/tun.go b/tun/netstack/tun.go
index 6efa45f..21f7cd5 100644
--- a/tun/netstack/tun.go
+++ b/tun/netstack/tun.go
@@ -181,16 +181,22 @@ func (tun *netTun) MTU() (int, error) {
 	return tun.mtu, nil
 }
 
-func convertToFullAddr(ip net.IP, port int) (tcpip.FullAddress, tcpip.NetworkProtocolNumber) {
+func convertToFullAddr(ip net.IP, port int, zone string) (tcpip.FullAddress, tcpip.NetworkProtocolNumber) {
+	var nic tcpip.NICID = 0
+
+	if zone != "" {
+		nic, _ = strconv.Atoi(zone)
+	}
+
 	if ip4 := ip.To4(); ip4 != nil {
 		return tcpip.FullAddress{
-			NIC:  1,
+			NIC:  nic,
 			Addr: tcpip.Address(ip4),
 			Port: uint16(port),
 		}, ipv4.ProtocolNumber
 	} else {
 		return tcpip.FullAddress{
-			NIC:  1,
+			NIC:  nic,
 			Addr: tcpip.Address(ip),
 			Port: uint16(port),
 		}, ipv6.ProtocolNumber
@@ -219,7 +225,7 @@ func (net *Net) DialContextTCP(ctx context.Context, addr *net.TCPAddr) (*gonet.T
 	if addr == nil {
 		panic("todo: deal with auto addr semantics for nil addr")
 	}
-	fa, pn := convertToFullAddr(addr.IP, addr.Port)
+	fa, pn := convertToFullAddr(addr.IP, addr.Port, addr.Zone)
 	return gonet.DialContextTCP(ctx, net.stack, fa, pn)
 }
 
@@ -227,7 +233,7 @@ func (net *Net) DialTCP(addr *net.TCPAddr) (*gonet.TCPConn, error) {
 	if addr == nil {
 		panic("todo: deal with auto addr semantics for nil addr")
 	}
-	fa, pn := convertToFullAddr(addr.IP, addr.Port)
+	fa, pn := convertToFullAddr(addr.IP, addr.Port, addr.Zone)
 	return gonet.DialTCP(net.stack, fa, pn)
 }
 
@@ -235,7 +241,7 @@ func (net *Net) ListenTCP(addr *net.TCPAddr) (*gonet.TCPListener, error) {
 	if addr == nil {
 		panic("todo: deal with auto addr semantics for nil addr")
 	}
-	fa, pn := convertToFullAddr(addr.IP, addr.Port)
+	fa, pn := convertToFullAddr(addr.IP, addr.Port, addr.Zone)
 	return gonet.ListenTCP(net.stack, fa, pn)
 }
 
@@ -244,12 +250,12 @@ func (net *Net) DialUDP(laddr, raddr *net.UDPAddr) (*gonet.UDPConn, error) {
 	var pn tcpip.NetworkProtocolNumber
 	if laddr != nil {
 		var addr tcpip.FullAddress
-		addr, pn = convertToFullAddr(laddr.IP, laddr.Port)
+		addr, pn = convertToFullAddr(laddr.IP, laddr.Port, laddr.Zone)
 		lfa = &addr
 	}
 	if raddr != nil {
 		var addr tcpip.FullAddress
-		addr, pn = convertToFullAddr(raddr.IP, raddr.Port)
+		addr, pn = convertToFullAddr(raddr.IP, raddr.Port, raddr.Zone)
 		rfa = &addr
 	}
 	return gonet.DialUDP(net.stack, lfa, rfa, pn)
-- 
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