65 lines
2.2 KiB
Go
65 lines
2.2 KiB
Go
// Copyright 2020 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcp_should_piggyback_test
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import (
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"flag"
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"testing"
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"time"
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"golang.org/x/sys/unix"
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"gvisor.dev/gvisor/pkg/tcpip/header"
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tb "gvisor.dev/gvisor/test/packetimpact/testbench"
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)
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func init() {
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tb.RegisterFlags(flag.CommandLine)
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}
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func TestPiggyback(t *testing.T) {
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dut := tb.NewDUT(t)
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defer dut.TearDown()
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listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1)
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defer dut.Close(listenFd)
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conn := tb.NewTCPIPv4(t, tb.TCP{DstPort: &remotePort, WindowSize: tb.Uint16(12)}, tb.TCP{SrcPort: &remotePort})
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defer conn.Close()
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conn.Handshake()
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acceptFd, _ := dut.Accept(listenFd)
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defer dut.Close(acceptFd)
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dut.SetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_NODELAY, 1)
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sampleData := []byte("Sample Data")
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dut.Send(acceptFd, sampleData, 0)
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expectedTCP := tb.TCP{Flags: tb.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}
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expectedPayload := tb.Payload{Bytes: sampleData}
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if _, err := conn.ExpectData(&expectedTCP, &expectedPayload, time.Second); err != nil {
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t.Fatalf("Expected %v but didn't get one: %s", tb.Layers{&expectedTCP, &expectedPayload}, err)
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}
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// Cause DUT to send us more data as soon as we ACK their first data segment because we have
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// a small window.
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dut.Send(acceptFd, sampleData, 0)
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// DUT should ACK our segment by piggybacking ACK to their outstanding data segment instead of
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// sending a separate ACK packet.
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conn.Send(expectedTCP, &expectedPayload)
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if _, err := conn.ExpectData(&expectedTCP, &expectedPayload, time.Second); err != nil {
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t.Fatalf("Expected %v but didn't get one: %s", tb.Layers{&expectedTCP, &expectedPayload}, err)
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}
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}
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