支持tap网卡,优化tun网卡配置

switch/src/tap_device/mac.rs

@@ -0,0 +1,13 @@
+use crate::tun_device::{TunReader, TunWriter};
+
+pub type TapReader = TunReader;
+pub type TapWriter = TunWriter;
+use std::net::Ipv4Addr;
+
+pub fn create_tap(
+    address: Ipv4Addr,
+    netmask: Ipv4Addr,
+    gateway: Ipv4Addr,
+) -> crate::error::Result<(TapWriter, TapReader, [u8; 6])> {
+    unimplemented!()
+}