bump version to v2.3.0 (#859)

also some improvements:

1. add magic dns option in gui.
2. allow icmp proxy fail on android
3. when no_tun is enabled, android do not start vpn service

Co-authored-by: Your Name <you@example.com>

easytier/src/instance/instance.rs

@@ -80,7 +80,13 @@ impl IpProxy {
 
         self.started.store(true, Ordering::Relaxed);
         self.tcp_proxy.start(true).await?;
-        self.icmp_proxy.start().await?;
+        if let Err(e) = self.icmp_proxy.start().await {
+            tracing::error!("start icmp proxy failed: {:?}", e);
+            if cfg!(not(target_os = "android")) {
+                // android may not support icmp proxy
+                return Err(e);
+            }
+        }
         self.udp_proxy.start().await?;
         Ok(())
     }

easytier/src/launcher.rs

@@ -668,6 +668,10 @@ impl NetworkConfig {
             flags.disable_udp_hole_punching = disable_udp_hole_punching;
         }
 
+        if let Some(enable_magic_dns) = self.enable_magic_dns {
+            flags.accept_dns = enable_magic_dns;
+        }
+
         if let Some(mtu) = self.mtu {
             flags.mtu = mtu as u32;
         }

easytier/src/proto/web.proto

@@ -63,6 +63,8 @@ message NetworkConfig {
     optional bool disable_udp_hole_punching = 39;
     optional int32 mtu = 40;
     repeated string mapped_listeners = 41;
+
+    optional bool enable_magic_dns = 42;
 }
 
 message MyNodeInfo {