TAP support added

- Supports Windows using OpenVPN NDIS 6 TAP driver
- Supports NDP Neighbor Solicitation and Advertisements in ndp.go
- Supports TAP encapsulation and decapsulation in tun.go

src/yggdrasil/tun_windows.go

@@ -0,0 +1,37 @@
+package yggdrasil
+
+import water "github.com/songgao/water"
+import "os/exec"
+import "strings"
+import "fmt"
+
+// This is to catch Windows platforms
+
+func (tun *tunDevice) setup(ifname string, addr string, mtu int) error {
+	config := water.Config{DeviceType: water.TAP}
+	config.PlatformSpecificParams.ComponentID = "tap0901"
+	config.PlatformSpecificParams.Network = "169.254.0.1/32"
+	iface, err := water.New(config)
+	if err != nil {
+		panic(err)
+	}
+	tun.iface = iface
+	tun.mtu = mtu
+	return tun.setupAddress(addr)
+}
+
+func (tun *tunDevice) setupAddress(addr string) error {
+	// Set address
+	// addr = strings.TrimRight(addr, "/8")
+	cmd := exec.Command("netsh", "interface", "ipv6", "set", "address",
+		fmt.Sprintf("interface=\"%s\"", tun.iface.Name()),
+		fmt.Sprintf("addr=\"%s\"", addr))
+	tun.core.log.Printf("netsh command: %v", strings.Join(cmd.Args, " "))
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		tun.core.log.Printf("Windows netsh failed: %v.", err)
+		tun.core.log.Println(string(output))
+		return err
+	}
+	return nil
+}