global: begin modularization

device/constants.go

@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package device
+
+import (
+	"time"
+)
+
+/* Specification constants */
+
+const (
+	RekeyAfterMessages      = (1 << 64) - (1 << 16) - 1
+	RejectAfterMessages     = (1 << 64) - (1 << 4) - 1
+	RekeyAfterTime          = time.Second * 120
+	RekeyAttemptTime        = time.Second * 90
+	RekeyTimeout            = time.Second * 5
+	MaxTimerHandshakes      = 90 / 5 /* RekeyAttemptTime / RekeyTimeout */
+	RekeyTimeoutJitterMaxMs = 334
+	RejectAfterTime         = time.Second * 180
+	KeepaliveTimeout        = time.Second * 10
+	CookieRefreshTime       = time.Second * 120
+	HandshakeInitationRate  = time.Second / 20
+	PaddingMultiple         = 16
+)
+
+const (
+	MinMessageSize = MessageKeepaliveSize                  // minimum size of transport message (keepalive)
+	MaxMessageSize = MaxSegmentSize                        // maximum size of transport message
+	MaxContentSize = MaxSegmentSize - MessageTransportSize // maximum size of transport message content
+)
+
+/* Implementation constants */
+
+const (
+	UnderLoadQueueSize = QueueHandshakeSize / 8
+	UnderLoadAfterTime = time.Second // how long does the device remain under load after detected
+	MaxPeers           = 1 << 16     // maximum number of configured peers
+)