fix: linux tun timeout (#4993)

* fix: linux tun timeout

* docs: UPDATELOG.md

UPDATELOG.md

@@ -22,6 +22,7 @@
 - 移除流媒体检测的系统级提示(使用软件内通知)
 - 优化后端 i18n 资源占用
 - 改进 Linux 托盘支持并添加 `--no-tray` 选项
+- Linux 现在在新生成的配置中默认将 TUN 栈恢复为 mixed 模式
 
 ### 🐞 修复问题
 

src-tauri/src/config/clash.rs

@@ -51,6 +51,9 @@ impl IClashTemp {
         let mut tun = Mapping::new();
         let mut cors_map = Mapping::new();
         tun.insert("enable".into(), false.into());
+        #[cfg(target_os = "linux")]
+        tun.insert("stack".into(), "mixed".into());
+        #[cfg(not(target_os = "linux"))]
         tun.insert("stack".into(), "gvisor".into());
         tun.insert("auto-route".into(), true.into());
         tun.insert("strict-route".into(), false.into());

src-tauri/src/enhance/tun.rs

@@ -29,6 +29,26 @@ pub fn use_tun(mut config: Mapping, enable: bool) -> Mapping {
     });
 
     if enable {
+        #[cfg(target_os = "linux")]
+        {
+            let stack_key = Value::from("stack");
+            let should_override = match tun_val.get(&stack_key) {
+                Some(value) => value
+                    .as_str()
+                    .map(|stack| stack.eq_ignore_ascii_case("gvisor"))
+                    .unwrap_or(false),
+                None => true,
+            };
+
+            if should_override {
+                revise!(tun_val, "stack", "mixed");
+                log::warn!(
+                    target: "app",
+                    "gVisor TUN stack detected on Linux; falling back to 'mixed' for compatibility"
+                );
+            }
+        }
+
         // 读取DNS配置
         let dns_key = Value::from("dns");
         let dns_val = config.get(&dns_key);