Add openvpn and openconnect

protocol/openvpn/socket_buffer.go

@@ -0,0 +1,21 @@
+//go:build !linux
+
+package openvpn
+
+import "github.com/sagernet/sing/common"
+
+const openVPNUDPSocketBufferSize = 7 << 20
+
+type openVPNUDPSocketBufferSetter interface {
+	SetReadBuffer(bytes int) error
+	SetWriteBuffer(bytes int) error
+}
+
+func tuneOpenVPNUDPSocket(connection any) {
+	bufferSetter, loaded := common.Cast[openVPNUDPSocketBufferSetter](connection)
+	if !loaded {
+		return
+	}
+	_ = bufferSetter.SetReadBuffer(openVPNUDPSocketBufferSize)
+	_ = bufferSetter.SetWriteBuffer(openVPNUDPSocketBufferSize)
+}