Per-platform TUN defaults

src/yggdrasil/debug.go

@@ -159,6 +159,20 @@ func (c *Core) DEBUG_getDHTSize() int {
 	return total
 }
 
+// TUN defaults
+
+func (c *Core) DEBUG_GetTUNDefaultIfName() string {
+	return getDefaults().defaultIfName
+}
+
+func (c *Core) DEBUG_GetTUNDefaultIfMTU() int {
+	return getDefaults().defaultIfMTU
+}
+
+func (c *Core) DEBUG_GetTUNDefaultIfTAPMode() bool {
+	return getDefaults().defaultIfTAPMode
+}
+
 // udpInterface
 //  FIXME udpInterface isn't exported
 //  So debug functions need to work differently...

src/yggdrasil/tun.go

@@ -5,6 +5,8 @@ package yggdrasil
 import "os"
 import ethernet "github.com/songgao/packets/ethernet"
 
+const DEFAULT_MTU = 65535
+
 const IPv6_HEADER_LENGTH = 40
 const ETHER_HEADER_LENGTH = 14
 
@@ -28,12 +30,15 @@ type tunDevice struct {
 }
 
 type tunDefaultParameters struct {
-	maxMTU	int
+	maximumIfMTU	   int
+	defaultIfMTU     int
+	defaultIfName	   string
+	defaultIfTAPMode bool
 }
 
-func getMTUFromMax(mtu int) int {
-	if mtu > defaultTUNParameters().maxMTU {
-		return defaultTUNParameters().maxMTU
+func getSupportedMTU(mtu int) int {
+	if mtu > getDefaults().maximumIfMTU {
+		return getDefaults().maximumIfMTU
 	}
 	return mtu
 }

src/yggdrasil/tun_darwin.go

@@ -10,9 +10,12 @@ import "golang.org/x/sys/unix"
 
 import water "github.com/neilalexander/water"
 
-func defaultTUNParameters() tunDefaultParameters {
+func getDefaults() tunDefaultParameters {
 	return tunDefaultParameters{
-		maxMTU: 65535,
+		maximumIfMTU:     65535,
+		defaultIfMTU:     DEFAULT_MTU,
+		defaultIfName:    "auto",
+		defaultIfTAPMode: false,
 	}
 }
 
@@ -26,7 +29,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 		panic(err)
 	}
 	tun.iface = iface
-	tun.mtu = getMTUFromMax(mtu)
+	tun.mtu = getSupportedMTU(mtu)
 	return tun.setupAddress(addr)
 }
 

src/yggdrasil/tun_linux.go

@@ -9,9 +9,12 @@ import "strings"
 
 import water "github.com/neilalexander/water"
 
-func defaultTUNParameters() tunDefaultParameters {
+func getDefaults() tunDefaultParameters {
 	return tunDefaultParameters{
-		maxMTU: 65535,
+		maximumIfMTU:     65535,
+		defaultIfMTU:     DEFAULT_MTU,
+		defaultIfName:    "auto",
+		defaultIfTAPMode: false,
 	}
 }
 
@@ -30,7 +33,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 		panic(err)
 	}
 	tun.iface = iface
-	tun.mtu = getMTUFromMax(mtu)
+	tun.mtu = getSupportedMTU(mtu)
 	return tun.setupAddress(addr)
 }
 

src/yggdrasil/tun_openbsd.go

@@ -15,9 +15,12 @@ import water "github.com/neilalexander/water"
 // to disable the PI header when in TUN mode, so we need to modify the read/
 // writes to handle those first four bytes
 
-func defaultTUNParameters() tunDefaultParameters {
+func getDefaults() tunDefaultParameters {
 	return tunDefaultParameters{
-		maxMTU: 16384,
+		maximumIfMTU:     16384,
+		defaultIfMTU:     DEFAULT_MTU,
+		defaultIfName:    "/dev/tap0",
+		defaultIfTAPMode: true,
 	}
 }
 
@@ -86,7 +89,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 		panic(err)
 	}
 	tun.iface = iface
-	tun.mtu = getMTUFromMax(mtu)
+	tun.mtu = getSupportedMTU(mtu)
 	return tun.setupAddress(addr)
 }
 

src/yggdrasil/tun_other.go

@@ -7,9 +7,12 @@ import water "github.com/neilalexander/water"
 // This is to catch unsupported platforms
 // If your platform supports tun devices, you could try configuring it manually
 
-func defaultTUNParameters() tunDefaultParameters {
+func getDefaults() tunDefaultParameters {
 	return tunDefaultParameters{
-		maxMTU: 65535,
+		maximumIfMTU:     65535,
+		defaultIfMTU:     DEFAULT_MTU,
+		defaultIfName:    "none",
+		defaultIfTAPMode: false,
 	}
 }
 
@@ -25,7 +28,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 		panic(err)
 	}
 	tun.iface = iface
-	tun.mtu = getMTUFromMax(mtu)
+	tun.mtu = getSupportedMTU(mtu)
 	return tun.setupAddress(addr)
 }
 

src/yggdrasil/tun_windows.go

@@ -7,9 +7,12 @@ import "fmt"
 
 // This is to catch Windows platforms
 
-func defaultTUNParameters() tunDefaultParameters {
+func getDefaults() tunDefaultParameters {
 	return tunDefaultParameters{
-		maxMTU: 65535,
+		maximumIfMTU:     65535,
+		defaultIfMTU:     DEFAULT_MTU,
+		defaultIfName:    "auto",
+		defaultIfTAPMode: true,
 	}
 }
 
@@ -47,7 +50,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 		panic(err)
 	}
 	tun.iface = iface
-	tun.mtu = getMTUFromMax(mtu)
+	tun.mtu = getSupportedMTU(mtu)
 	err = tun.setupMTU(tun.mtu)
 	if err != nil {
 		panic(err)