tun: import mobile particularities

device/queueconstants_android.go

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package device
+
+/* Reduce memory consumption for Android */
+
+const (
+	QueueOutboundSize          = 1024
+	QueueInboundSize           = 1024
+	QueueHandshakeSize         = 1024
+	MaxSegmentSize             = 2200
+	PreallocatedBuffersPerPool = 4096
+)

device/queueconstants_default.go

@@ -1,3 +1,5 @@
+// +build !android,!ios
+
 /* SPDX-License-Identifier: MIT
  *
  * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
@@ -5,8 +7,6 @@
 
 package device
 
-/* Implementation specific constants */
-
 const (
 	QueueOutboundSize          = 1024
 	QueueInboundSize           = 1024

device/queueconstants_ios.go

@@ -0,0 +1,18 @@
+// +build ios
+
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package device
+
+/* Fit within memory limits for iOS's Network Extension API, which has stricter requirements */
+
+const (
+	QueueOutboundSize          = 1024
+	QueueInboundSize           = 1024
+	QueueHandshakeSize         = 1024
+	MaxSegmentSize             = 1700
+	PreallocatedBuffersPerPool = 1024
+)