Remove unused ICMP replies & Improve tcpbuf options

stack_gvisor_tcpbuf_ios.go

@@ -0,0 +1,21 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build with_gvisor
+
+package tun
+
+import "github.com/sagernet/gvisor/pkg/tcpip/transport/tcp"
+
+const (
+	// tcp{RX,TX}Buf{Min,Def,Max}Size mirror gVisor defaults. We leave these
+	// unchanged on iOS for now as to not increase pressure towards the
+	// NetworkExtension memory limit.
+	tcpRXBufMinSize = tcp.MinBufferSize
+	tcpRXBufDefSize = tcp.DefaultSendBufferSize
+	tcpRXBufMaxSize = tcp.MaxBufferSize
+
+	tcpTXBufMinSize = tcp.MinBufferSize
+	tcpTXBufDefSize = tcp.DefaultReceiveBufferSize
+	tcpTXBufMaxSize = tcp.MaxBufferSize
+)