add increase max connection & clean up code

core/src/main/golang/tun/tun.go

@@ -55,6 +55,8 @@ func StartTunDevice(fd, mtu int, gateway, mirror, dnsAddress string, onStop func
 	file := os.NewFile(uintptr(fd), "/dev/tun")
 	_ = syscall.SetNonblock(fd, true)
 
+	increaseMaxConnection()
+
 	adapter = tun2socket.NewTun2Socket(file, mtu, gatewayIP, mirrorIP.To4())
 
 	adapter.SetLogger(&ClashLogger{})
@@ -133,3 +135,23 @@ func StopTunDevice() {
 		log.Infoln("Android tun stopped")
 	}
 }
+
+func increaseMaxConnection() {
+	var limit syscall.Rlimit
+
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
+		return
+	}
+
+	if limit.Max == limit.Cur {
+		return
+	}
+
+	limit.Cur = limit.Max
+
+	if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
+		return
+	}
+
+	log.Infoln("Increase max connection to %d", limit.Cur)
+}

service/src/main/java/com/github/kr328/clash/service/TunService.kt

@@ -19,7 +19,6 @@ class TunService : VpnService(), CoroutineScope by MainScope() {
         private const val PRIVATE_VLAN4_CLIENT = "172.31.255.253"
         private const val PRIVATE_VLAN4_MIRROR = "172.31.255.254"
         private const val PRIVATE_VLAN_DNS = "198.18.0.1"
-        private const val VLAN_ANY = "0.0.0.0/0"
     }
 
     private val service = this