initial: ZeroTier-like P2P mesh VPN server with multi-tenant Web UI

internal/tap/tap.go

@@ -0,0 +1,24 @@
+package tap
+
+type Interface struct {
+	Name string
+	MTU  int
+	fd   int
+}
+
+// Open creates a TAP interface on Linux. On other platforms it returns an error.
+func Open(name string, mtu int) (*Interface, error) {
+	return openTap(name, mtu)
+}
+
+func (t *Interface) Read(buf []byte) (int, error) {
+	return readBuf(t.fd, buf)
+}
+
+func (t *Interface) Write(buf []byte) (int, error) {
+	return writeBuf(t.fd, buf)
+}
+
+func (t *Interface) Close() error {
+	return closeFD(t.fd)
+}