2760 lines
76 KiB
Go
2760 lines
76 KiB
Go
// Copyright 2016 The Netstack Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tcp_test
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import (
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"bytes"
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"fmt"
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"testing"
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"time"
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"gvisor.googlesource.com/gvisor/pkg/tcpip"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/checker"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/header"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/link/loopback"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/link/sniffer"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/network/ipv4"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/seqnum"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/tcp"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/tcp/testing/context"
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"gvisor.googlesource.com/gvisor/pkg/waiter"
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)
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const (
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// defaultMTU is the MTU, in bytes, used throughout the tests, except
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// where another value is explicitly used. It is chosen to match the MTU
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// of loopback interfaces on linux systems.
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defaultMTU = 65535
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// defaultIPv4MSS is the MSS sent by the network stack in SYN/SYN-ACK for an
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// IPv4 endpoint when the MTU is set to defaultMTU in the test.
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defaultIPv4MSS = defaultMTU - header.IPv4MinimumSize - header.TCPMinimumSize
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)
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func TestGiveUpConnect(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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var wq waiter.Queue
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ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &wq)
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if err != nil {
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t.Fatalf("NewEndpoint failed: %v", err)
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}
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// Register for notification, then start connection attempt.
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waitEntry, notifyCh := waiter.NewChannelEntry(nil)
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wq.EventRegister(&waitEntry, waiter.EventOut)
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defer wq.EventUnregister(&waitEntry)
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if err := ep.Connect(tcpip.FullAddress{Addr: context.TestAddr, Port: context.TestPort}); err != tcpip.ErrConnectStarted {
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t.Fatalf("Unexpected return value from Connect: %v", err)
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}
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// Close the connection, wait for completion.
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ep.Close()
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// Wait for ep to become writable.
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<-notifyCh
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if err := ep.GetSockOpt(tcpip.ErrorOption{}); err != tcpip.ErrAborted {
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t.Fatalf("got ep.GetSockOpt(tcpip.ErrorOption{}) = %v, want = %v", err, tcpip.ErrAborted)
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}
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}
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func TestActiveHandshake(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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c.CreateConnected(789, 30000, nil)
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}
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func TestNonBlockingClose(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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c.CreateConnected(789, 30000, nil)
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ep := c.EP
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c.EP = nil
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// Close the endpoint and measure how long it takes.
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t0 := time.Now()
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ep.Close()
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if diff := time.Now().Sub(t0); diff > 3*time.Second {
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t.Fatalf("Took too long to close: %v", diff)
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}
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}
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func TestConnectResetAfterClose(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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c.CreateConnected(789, 30000, nil)
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ep := c.EP
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c.EP = nil
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// Close the endpoint, make sure we get a FIN segment, then acknowledge
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// to complete closure of sender, but don't send our own FIN.
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ep.Close()
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(790),
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checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
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),
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)
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c.SendPacket(nil, &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 790,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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// Wait for the ep to give up waiting for a FIN, and send a RST.
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time.Sleep(3 * time.Second)
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for {
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b := c.GetPacket()
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tcp := header.TCP(header.IPv4(b).Payload())
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if tcp.Flags() == header.TCPFlagAck|header.TCPFlagFin {
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// This is a retransmit of the FIN, ignore it.
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continue
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}
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checker.IPv4(t, b,
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(790),
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checker.TCPFlags(header.TCPFlagAck|header.TCPFlagRst),
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),
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)
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break
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}
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}
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func TestSimpleReceive(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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c.CreateConnected(789, 30000, nil)
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we, ch := waiter.NewChannelEntry(nil)
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c.WQ.EventRegister(&we, waiter.EventIn)
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defer c.WQ.EventUnregister(&we)
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if _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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data := []byte{1, 2, 3}
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c.SendPacket(data, &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 790,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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// Wait for receive to be notified.
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select {
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case <-ch:
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case <-time.After(1 * time.Second):
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t.Fatalf("Timed out waiting for data to arrive")
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}
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// Receive data.
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v, err := c.EP.Read(nil)
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if err != nil {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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if bytes.Compare(data, v) != 0 {
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t.Fatalf("Data is different: expected %v, got %v", data, v)
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}
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// Check that ACK is received.
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(uint32(790+len(data))),
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checker.TCPFlags(header.TCPFlagAck),
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),
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)
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}
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func TestOutOfOrderReceive(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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c.CreateConnected(789, 30000, nil)
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we, ch := waiter.NewChannelEntry(nil)
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c.WQ.EventRegister(&we, waiter.EventIn)
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defer c.WQ.EventUnregister(&we)
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if _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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// Send second half of data first, with seqnum 3 ahead of expected.
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data := []byte{1, 2, 3, 4, 5, 6}
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c.SendPacket(data[3:], &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 793,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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// Check that we get an ACK specifying which seqnum is expected.
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(790),
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checker.TCPFlags(header.TCPFlagAck),
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),
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)
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// Wait 200ms and check that no data has been received.
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time.Sleep(200 * time.Millisecond)
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if _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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// Send the first 3 bytes now.
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c.SendPacket(data[:3], &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 790,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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// Receive data.
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read := make([]byte, 0, 6)
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for len(read) < len(data) {
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v, err := c.EP.Read(nil)
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if err != nil {
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if err == tcpip.ErrWouldBlock {
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// Wait for receive to be notified.
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select {
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case <-ch:
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case <-time.After(5 * time.Second):
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t.Fatalf("Timed out waiting for data to arrive")
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}
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continue
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}
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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read = append(read, v...)
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}
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// Check that we received the data in proper order.
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if bytes.Compare(data, read) != 0 {
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t.Fatalf("Data is different: expected %v, got %v", data, read)
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}
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// Check that the whole data is acknowledged.
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(uint32(790+len(data))),
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checker.TCPFlags(header.TCPFlagAck),
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),
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)
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}
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func TestOutOfOrderFlood(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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// Create a new connection with initial window size of 10.
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opt := tcpip.ReceiveBufferSizeOption(10)
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c.CreateConnected(789, 30000, &opt)
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if _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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// Send 100 packets before the actual one that is expected.
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data := []byte{1, 2, 3, 4, 5, 6}
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for i := 0; i < 100; i++ {
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c.SendPacket(data[3:], &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 796,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(790),
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checker.TCPFlags(header.TCPFlagAck),
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),
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)
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}
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// Send packet with seqnum 793. It must be discarded because the
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// out-of-order buffer was filled by the previous packets.
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c.SendPacket(data[3:], &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 793,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(790),
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checker.TCPFlags(header.TCPFlagAck),
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),
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)
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// Now send the expected packet, seqnum 790.
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c.SendPacket(data[:3], &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 790,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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// Check that only packet 790 is acknowledged.
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(793),
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checker.TCPFlags(header.TCPFlagAck),
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),
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)
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}
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func TestRstOnCloseWithUnreadData(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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c.CreateConnected(789, 30000, nil)
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we, ch := waiter.NewChannelEntry(nil)
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c.WQ.EventRegister(&we, waiter.EventIn)
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defer c.WQ.EventUnregister(&we)
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if _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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data := []byte{1, 2, 3}
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c.SendPacket(data, &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 790,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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// Wait for receive to be notified.
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select {
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case <-ch:
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case <-time.After(3 * time.Second):
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t.Fatalf("Timed out waiting for data to arrive")
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}
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// Check that ACK is received, this happens regardless of the read.
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(uint32(790+len(data))),
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checker.TCPFlags(header.TCPFlagAck),
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),
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)
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// Now that we know we have unread data, let's just close the connection
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// and verify that netstack sends an RST rather than a FIN.
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c.EP.Close()
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.TCPFlags(header.TCPFlagAck|header.TCPFlagRst),
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))
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}
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func TestFullWindowReceive(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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opt := tcpip.ReceiveBufferSizeOption(10)
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c.CreateConnected(789, 30000, &opt)
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we, ch := waiter.NewChannelEntry(nil)
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c.WQ.EventRegister(&we, waiter.EventIn)
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defer c.WQ.EventUnregister(&we)
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_, err := c.EP.Read(nil)
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if err != tcpip.ErrWouldBlock {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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// Fill up the window.
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data := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
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c.SendPacket(data, &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 790,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
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// Wait for receive to be notified.
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select {
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case <-ch:
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case <-time.After(5 * time.Second):
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t.Fatalf("Timed out waiting for data to arrive")
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}
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// Check that data is acknowledged, and window goes to zero.
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(uint32(790+len(data))),
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checker.TCPFlags(header.TCPFlagAck),
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checker.Window(0),
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),
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)
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// Receive data and check it.
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v, err := c.EP.Read(nil)
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if err != nil {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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if bytes.Compare(data, v) != 0 {
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t.Fatalf("Data is different: expected %v, got %v", data, v)
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}
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// Check that we get an ACK for the newly non-zero window.
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checker.IPv4(t, c.GetPacket(),
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checker.TCP(
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checker.DstPort(context.TestPort),
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checker.SeqNum(uint32(c.IRS)+1),
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checker.AckNum(uint32(790+len(data))),
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checker.TCPFlags(header.TCPFlagAck),
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checker.Window(10),
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),
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)
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}
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func TestNoWindowShrinking(t *testing.T) {
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c := context.New(t, defaultMTU)
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defer c.Cleanup()
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// Start off with a window size of 10, then shrink it to 5.
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opt := tcpip.ReceiveBufferSizeOption(10)
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c.CreateConnected(789, 30000, &opt)
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opt = 5
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if err := c.EP.SetSockOpt(opt); err != nil {
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t.Fatalf("SetSockOpt failed: %v", err)
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}
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we, ch := waiter.NewChannelEntry(nil)
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c.WQ.EventRegister(&we, waiter.EventIn)
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defer c.WQ.EventUnregister(&we)
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_, err := c.EP.Read(nil)
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if err != tcpip.ErrWouldBlock {
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t.Fatalf("Unexpected error from Read: %v", err)
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}
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// Send 3 bytes, check that the peer acknowledges them.
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data := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
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c.SendPacket(data[:3], &context.Headers{
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SrcPort: context.TestPort,
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DstPort: c.Port,
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Flags: header.TCPFlagAck,
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SeqNum: 790,
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AckNum: c.IRS.Add(1),
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RcvWnd: 30000,
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})
|
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|
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// Wait for receive to be notified.
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select {
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case <-ch:
|
|
case <-time.After(5 * time.Second):
|
|
t.Fatalf("Timed out waiting for data to arrive")
|
|
}
|
|
|
|
// Check that data is acknowledged, and that window doesn't go to zero
|
|
// just yet because it was previously set to 10. It must go to 7 now.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(793),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
checker.Window(7),
|
|
),
|
|
)
|
|
|
|
// Send 7 more bytes, check that the window fills up.
|
|
c.SendPacket(data[3:], &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 793,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
select {
|
|
case <-ch:
|
|
case <-time.After(5 * time.Second):
|
|
t.Fatalf("Timed out waiting for data to arrive")
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(uint32(790+len(data))),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
checker.Window(0),
|
|
),
|
|
)
|
|
|
|
// Receive data and check it.
|
|
read := make([]byte, 0, 10)
|
|
for len(read) < len(data) {
|
|
v, err := c.EP.Read(nil)
|
|
if err != nil {
|
|
t.Fatalf("Unexpected error from Read: %v", err)
|
|
}
|
|
|
|
read = append(read, v...)
|
|
}
|
|
|
|
if bytes.Compare(data, read) != 0 {
|
|
t.Fatalf("Data is different: expected %v, got %v", data, read)
|
|
}
|
|
|
|
// Check that we get an ACK for the newly non-zero window, which is the
|
|
// new size.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(uint32(790+len(data))),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
checker.Window(5),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestSimpleSend(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
data := []byte{1, 2, 3}
|
|
view := buffer.NewView(len(data))
|
|
copy(view, data)
|
|
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Check that data is received.
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.PayloadLen(len(data)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
if p := b[header.IPv4MinimumSize+header.TCPMinimumSize:]; bytes.Compare(data, p) != 0 {
|
|
t.Fatalf("Data is different: expected %v, got %v", data, p)
|
|
}
|
|
|
|
// Acknowledge the data.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1 + seqnum.Size(len(data))),
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
|
|
func TestZeroWindowSend(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 0, nil)
|
|
|
|
data := []byte{1, 2, 3}
|
|
view := buffer.NewView(len(data))
|
|
copy(view, data)
|
|
|
|
_, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{})
|
|
if err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Since the window is currently zero, check that no packet is received.
|
|
c.CheckNoPacket("Packet received when window is zero")
|
|
|
|
// Open up the window. Data should be received now.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that data is received.
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.PayloadLen(len(data)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
if p := b[header.IPv4MinimumSize+header.TCPMinimumSize:]; bytes.Compare(data, p) != 0 {
|
|
t.Fatalf("Data is different: expected %v, got %v", data, p)
|
|
}
|
|
|
|
// Acknowledge the data.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1 + seqnum.Size(len(data))),
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
|
|
func TestScaledWindowConnect(t *testing.T) {
|
|
// This test ensures that window scaling is used when the peer
|
|
// does advertise it and connection is established with Connect().
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Set the window size greater than the maximum non-scaled window.
|
|
opt := tcpip.ReceiveBufferSizeOption(65535 * 3)
|
|
c.CreateConnectedWithRawOptions(789, 30000, &opt, []byte{
|
|
header.TCPOptionWS, 3, 0, header.TCPOptionNOP,
|
|
})
|
|
|
|
data := []byte{1, 2, 3}
|
|
view := buffer.NewView(len(data))
|
|
copy(view, data)
|
|
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Check that data is received, and that advertised window is 0xbfff,
|
|
// that is, that it is scaled.
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.PayloadLen(len(data)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.Window(0xbfff),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestNonScaledWindowConnect(t *testing.T) {
|
|
// This test ensures that window scaling is not used when the peer
|
|
// doesn't advertise it and connection is established with Connect().
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Set the window size greater than the maximum non-scaled window.
|
|
opt := tcpip.ReceiveBufferSizeOption(65535 * 3)
|
|
c.CreateConnected(789, 30000, &opt)
|
|
|
|
data := []byte{1, 2, 3}
|
|
view := buffer.NewView(len(data))
|
|
copy(view, data)
|
|
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Check that data is received, and that advertised window is 0xffff,
|
|
// that is, that it's not scaled.
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.PayloadLen(len(data)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.Window(0xffff),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestScaledWindowAccept(t *testing.T) {
|
|
// This test ensures that window scaling is used when the peer
|
|
// does advertise it and connection is established with Accept().
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Create EP and start listening.
|
|
wq := &waiter.Queue{}
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
defer ep.Close()
|
|
|
|
// Set the window size greater than the maximum non-scaled window.
|
|
if err := ep.SetSockOpt(tcpip.ReceiveBufferSizeOption(65535 * 3)); err != nil {
|
|
t.Fatalf("SetSockOpt failed failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Listen(10); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
// Do 3-way handshake.
|
|
c.PassiveConnectWithOptions(100, 2, header.TCPSynOptions{MSS: defaultIPv4MSS})
|
|
|
|
// Try to accept the connection.
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
wq.EventRegister(&we, waiter.EventIn)
|
|
defer wq.EventUnregister(&we)
|
|
|
|
c.EP, _, err = ep.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
c.EP, _, err = ep.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
data := []byte{1, 2, 3}
|
|
view := buffer.NewView(len(data))
|
|
copy(view, data)
|
|
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Check that data is received, and that advertised window is 0xbfff,
|
|
// that is, that it is scaled.
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.PayloadLen(len(data)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.Window(0xbfff),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestNonScaledWindowAccept(t *testing.T) {
|
|
// This test ensures that window scaling is not used when the peer
|
|
// doesn't advertise it and connection is established with Accept().
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Create EP and start listening.
|
|
wq := &waiter.Queue{}
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
defer ep.Close()
|
|
|
|
// Set the window size greater than the maximum non-scaled window.
|
|
if err := ep.SetSockOpt(tcpip.ReceiveBufferSizeOption(65535 * 3)); err != nil {
|
|
t.Fatalf("SetSockOpt failed failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Listen(10); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
// Do 3-way handshake.
|
|
c.PassiveConnect(100, 2, header.TCPSynOptions{MSS: defaultIPv4MSS})
|
|
|
|
// Try to accept the connection.
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
wq.EventRegister(&we, waiter.EventIn)
|
|
defer wq.EventUnregister(&we)
|
|
|
|
c.EP, _, err = ep.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
c.EP, _, err = ep.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
data := []byte{1, 2, 3}
|
|
view := buffer.NewView(len(data))
|
|
copy(view, data)
|
|
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Check that data is received, and that advertised window is 0xffff,
|
|
// that is, that it's not scaled.
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.PayloadLen(len(data)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.Window(0xffff),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestZeroScaledWindowReceive(t *testing.T) {
|
|
// This test ensures that the endpoint sends a non-zero window size
|
|
// advertisement when the scaled window transitions from 0 to non-zero,
|
|
// but the actual window (not scaled) hasn't gotten to zero.
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Set the window size such that a window scale of 4 will be used.
|
|
const wnd = 65535 * 10
|
|
const ws = uint32(4)
|
|
opt := tcpip.ReceiveBufferSizeOption(wnd)
|
|
c.CreateConnectedWithRawOptions(789, 30000, &opt, []byte{
|
|
header.TCPOptionWS, 3, 0, header.TCPOptionNOP,
|
|
})
|
|
|
|
// Write chunks of 50000 bytes.
|
|
remain := wnd
|
|
sent := 0
|
|
data := make([]byte, 50000)
|
|
for remain > len(data) {
|
|
c.SendPacket(data, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: seqnum.Value(790 + sent),
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
sent += len(data)
|
|
remain -= len(data)
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(uint32(790+sent)),
|
|
checker.Window(uint16(remain>>ws)),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
// Make the window non-zero, but the scaled window zero.
|
|
if remain >= 16 {
|
|
data = data[:remain-15]
|
|
c.SendPacket(data, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: seqnum.Value(790 + sent),
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
sent += len(data)
|
|
remain -= len(data)
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(uint32(790+sent)),
|
|
checker.Window(0),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
// Read some data. An ack should be sent in response to that.
|
|
v, err := c.EP.Read(nil)
|
|
if err != nil {
|
|
t.Fatalf("Unexpected error from Read: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(uint32(790+sent)),
|
|
checker.Window(uint16(len(v)>>ws)),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
func testBrokenUpWrite(t *testing.T, c *context.Context, maxPayload int) {
|
|
payloadMultiplier := 10
|
|
dataLen := payloadMultiplier * maxPayload
|
|
data := make([]byte, dataLen)
|
|
for i := range data {
|
|
data[i] = byte(i)
|
|
}
|
|
|
|
view := buffer.NewView(len(data))
|
|
copy(view, data)
|
|
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Check that data is received in chunks.
|
|
bytesReceived := 0
|
|
numPackets := 0
|
|
for bytesReceived != dataLen {
|
|
b := c.GetPacket()
|
|
numPackets++
|
|
tcp := header.TCP(header.IPv4(b).Payload())
|
|
payloadLen := len(tcp.Payload())
|
|
checker.IPv4(t, b,
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1+uint32(bytesReceived)),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
pdata := data[bytesReceived : bytesReceived+payloadLen]
|
|
if p := tcp.Payload(); bytes.Compare(pdata, p) != 0 {
|
|
t.Fatalf("Data is different: expected %v, got %v", pdata, p)
|
|
}
|
|
bytesReceived += payloadLen
|
|
var options []byte
|
|
if c.TimeStampEnabled {
|
|
// If timestamp option is enabled, echo back the timestamp and increment
|
|
// the TSEcr value included in the packet and send that back as the TSVal.
|
|
parsedOpts := tcp.ParsedOptions()
|
|
tsOpt := [12]byte{header.TCPOptionNOP, header.TCPOptionNOP}
|
|
header.EncodeTSOption(parsedOpts.TSEcr+1, parsedOpts.TSVal, tsOpt[2:])
|
|
options = tsOpt[:]
|
|
}
|
|
// Acknowledge the data.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1 + seqnum.Size(bytesReceived)),
|
|
RcvWnd: 30000,
|
|
TCPOpts: options,
|
|
})
|
|
}
|
|
if numPackets == 1 {
|
|
t.Fatalf("expected write to be broken up into multiple packets, but got 1 packet")
|
|
}
|
|
}
|
|
|
|
func TestSendGreaterThanMTU(t *testing.T) {
|
|
const maxPayload = 100
|
|
c := context.New(t, uint32(header.TCPMinimumSize+header.IPv4MinimumSize+maxPayload))
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
testBrokenUpWrite(t, c, maxPayload)
|
|
}
|
|
|
|
func TestActiveSendMSSLessThanMTU(t *testing.T) {
|
|
const maxPayload = 100
|
|
c := context.New(t, 65535)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnectedWithRawOptions(789, 30000, nil, []byte{
|
|
header.TCPOptionMSS, 4, byte(maxPayload / 256), byte(maxPayload % 256),
|
|
})
|
|
testBrokenUpWrite(t, c, maxPayload)
|
|
}
|
|
|
|
func TestPassiveSendMSSLessThanMTU(t *testing.T) {
|
|
const maxPayload = 100
|
|
const mtu = 1200
|
|
c := context.New(t, mtu)
|
|
defer c.Cleanup()
|
|
|
|
// Create EP and start listening.
|
|
wq := &waiter.Queue{}
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
defer ep.Close()
|
|
|
|
// Set the buffer size to a deterministic size so that we can check the
|
|
// window scaling option.
|
|
const rcvBufferSize = 0x20000
|
|
const wndScale = 2
|
|
if err := ep.SetSockOpt(tcpip.ReceiveBufferSizeOption(rcvBufferSize)); err != nil {
|
|
t.Fatalf("SetSockOpt failed failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Listen(10); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
// Do 3-way handshake.
|
|
c.PassiveConnect(maxPayload, wndScale, header.TCPSynOptions{MSS: mtu - header.IPv4MinimumSize - header.TCPMinimumSize})
|
|
|
|
// Try to accept the connection.
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
wq.EventRegister(&we, waiter.EventIn)
|
|
defer wq.EventUnregister(&we)
|
|
|
|
c.EP, _, err = ep.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
c.EP, _, err = ep.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
// Check that data gets properly segmented.
|
|
testBrokenUpWrite(t, c, maxPayload)
|
|
}
|
|
|
|
func TestSynCookiePassiveSendMSSLessThanMTU(t *testing.T) {
|
|
const maxPayload = 536
|
|
const mtu = 2000
|
|
c := context.New(t, mtu)
|
|
defer c.Cleanup()
|
|
|
|
// Set the SynRcvd threshold to zero to force a syn cookie based accept
|
|
// to happen.
|
|
saved := tcp.SynRcvdCountThreshold
|
|
defer func() {
|
|
tcp.SynRcvdCountThreshold = saved
|
|
}()
|
|
tcp.SynRcvdCountThreshold = 0
|
|
|
|
// Create EP and start listening.
|
|
wq := &waiter.Queue{}
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
defer ep.Close()
|
|
|
|
if err := ep.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Listen(10); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
// Do 3-way handshake.
|
|
c.PassiveConnect(maxPayload, -1, header.TCPSynOptions{MSS: mtu - header.IPv4MinimumSize - header.TCPMinimumSize})
|
|
|
|
// Try to accept the connection.
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
wq.EventRegister(&we, waiter.EventIn)
|
|
defer wq.EventUnregister(&we)
|
|
|
|
c.EP, _, err = ep.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
c.EP, _, err = ep.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
// Check that data gets properly segmented.
|
|
testBrokenUpWrite(t, c, maxPayload)
|
|
}
|
|
|
|
func TestForwarderSendMSSLessThanMTU(t *testing.T) {
|
|
const maxPayload = 100
|
|
const mtu = 1200
|
|
c := context.New(t, mtu)
|
|
defer c.Cleanup()
|
|
|
|
s := c.Stack()
|
|
ch := make(chan *tcpip.Error, 1)
|
|
f := tcp.NewForwarder(s, 65536, 10, func(r *tcp.ForwarderRequest) {
|
|
var err *tcpip.Error
|
|
c.EP, err = r.CreateEndpoint(&c.WQ)
|
|
ch <- err
|
|
})
|
|
s.SetTransportProtocolHandler(tcp.ProtocolNumber, f.HandlePacket)
|
|
|
|
// Do 3-way handshake.
|
|
c.PassiveConnect(maxPayload, 1, header.TCPSynOptions{MSS: mtu - header.IPv4MinimumSize - header.TCPMinimumSize})
|
|
|
|
// Wait for connection to be available.
|
|
select {
|
|
case err := <-ch:
|
|
if err != nil {
|
|
t.Fatalf("Error creating endpoint: %v", err)
|
|
}
|
|
case <-time.After(2 * time.Second):
|
|
t.Fatalf("Timed out waiting for connection")
|
|
}
|
|
|
|
// Check that data gets properly segmented.
|
|
testBrokenUpWrite(t, c, maxPayload)
|
|
}
|
|
|
|
func TestSynOptionsOnActiveConnect(t *testing.T) {
|
|
const mtu = 1400
|
|
c := context.New(t, mtu)
|
|
defer c.Cleanup()
|
|
|
|
// Create TCP endpoint.
|
|
var err *tcpip.Error
|
|
c.EP, err = c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &c.WQ)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
|
|
// Set the buffer size to a deterministic size so that we can check the
|
|
// window scaling option.
|
|
const rcvBufferSize = 0x20000
|
|
const wndScale = 2
|
|
if err := c.EP.SetSockOpt(tcpip.ReceiveBufferSizeOption(rcvBufferSize)); err != nil {
|
|
t.Fatalf("SetSockOpt failed failed: %v", err)
|
|
}
|
|
|
|
// Start connection attempt.
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
c.WQ.EventRegister(&we, waiter.EventOut)
|
|
defer c.WQ.EventUnregister(&we)
|
|
|
|
err = c.EP.Connect(tcpip.FullAddress{Addr: context.TestAddr, Port: context.TestPort})
|
|
if err != tcpip.ErrConnectStarted {
|
|
t.Fatalf("Unexpected return value from Connect: %v", err)
|
|
}
|
|
|
|
// Receive SYN packet.
|
|
b := c.GetPacket()
|
|
|
|
checker.IPv4(t, b,
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.TCPFlags(header.TCPFlagSyn),
|
|
checker.TCPSynOptions(header.TCPSynOptions{MSS: mtu - header.IPv4MinimumSize - header.TCPMinimumSize, WS: wndScale}),
|
|
),
|
|
)
|
|
|
|
tcp := header.TCP(header.IPv4(b).Payload())
|
|
c.IRS = seqnum.Value(tcp.SequenceNumber())
|
|
|
|
// Wait for retransmit.
|
|
time.Sleep(1 * time.Second)
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.TCPFlags(header.TCPFlagSyn),
|
|
checker.SrcPort(tcp.SourcePort()),
|
|
checker.SeqNum(tcp.SequenceNumber()),
|
|
checker.TCPSynOptions(header.TCPSynOptions{MSS: mtu - header.IPv4MinimumSize - header.TCPMinimumSize, WS: wndScale}),
|
|
),
|
|
)
|
|
|
|
// Send SYN-ACK.
|
|
iss := seqnum.Value(789)
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: tcp.DestinationPort(),
|
|
DstPort: tcp.SourcePort(),
|
|
Flags: header.TCPFlagSyn | header.TCPFlagAck,
|
|
SeqNum: iss,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Receive ACK packet.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(uint32(iss)+1),
|
|
),
|
|
)
|
|
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
err = c.EP.GetSockOpt(tcpip.ErrorOption{})
|
|
if err != nil {
|
|
t.Fatalf("Unexpected error when connecting: %v", err)
|
|
}
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for connection")
|
|
}
|
|
}
|
|
|
|
func TestCloseListener(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Create listener.
|
|
var wq waiter.Queue
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Bind(tcpip.FullAddress{}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Listen(10); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
// Close the listener and measure how long it takes.
|
|
t0 := time.Now()
|
|
ep.Close()
|
|
if diff := time.Now().Sub(t0); diff > 3*time.Second {
|
|
t.Fatalf("Took too long to close: %v", diff)
|
|
}
|
|
}
|
|
|
|
func TestReceiveOnResetConnection(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Send RST segment.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagRst,
|
|
SeqNum: 790,
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Try to read.
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
c.WQ.EventRegister(&we, waiter.EventIn)
|
|
defer c.WQ.EventUnregister(&we)
|
|
|
|
loop:
|
|
for {
|
|
switch _, err := c.EP.Read(nil); err {
|
|
case nil:
|
|
t.Fatalf("Unexpected success.")
|
|
case tcpip.ErrWouldBlock:
|
|
select {
|
|
case <-ch:
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for reset to arrive")
|
|
}
|
|
case tcpip.ErrConnectionReset:
|
|
break loop
|
|
default:
|
|
t.Fatalf("Unexpected error: want %v, got %v", tcpip.ErrConnectionReset, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestSendOnResetConnection(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Send RST segment.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagRst,
|
|
SeqNum: 790,
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Wait for the RST to be received.
|
|
time.Sleep(1 * time.Second)
|
|
|
|
// Try to write.
|
|
view := buffer.NewView(10)
|
|
_, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{})
|
|
if err != tcpip.ErrConnectionReset {
|
|
t.Fatalf("Unexpected error from Write: want %v, got %v", tcpip.ErrConnectionReset, err)
|
|
}
|
|
}
|
|
|
|
func TestFinImmediately(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Shutdown immediately, check that we get a FIN.
|
|
if err := c.EP.Shutdown(tcpip.ShutdownWrite); err != nil {
|
|
t.Fatalf("Unexpected error from Shutdown: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
|
|
// Ack and send FIN as well.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck | header.TCPFlagFin,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(2),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that the stack acks the FIN.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+2),
|
|
checker.AckNum(791),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestFinRetransmit(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Shutdown immediately, check that we get a FIN.
|
|
if err := c.EP.Shutdown(tcpip.ShutdownWrite); err != nil {
|
|
t.Fatalf("Unexpected error from Shutdown: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
|
|
// Don't acknowledge yet. We should get a retransmit of the FIN.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
|
|
// Ack and send FIN as well.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck | header.TCPFlagFin,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(2),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that the stack acks the FIN.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+2),
|
|
checker.AckNum(791),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestFinWithNoPendingData(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Write something out, and have it acknowledged.
|
|
view := buffer.NewView(10)
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
next := uint32(c.IRS) + 1
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(len(view)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
next += uint32(len(view))
|
|
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Shutdown, check that we get a FIN.
|
|
if err := c.EP.Shutdown(tcpip.ShutdownWrite); err != nil {
|
|
t.Fatalf("Unexpected error from Shutdown: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
next++
|
|
|
|
// Ack and send FIN as well.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck | header.TCPFlagFin,
|
|
SeqNum: 790,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that the stack acks the FIN.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(791),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestFinWithPendingDataCwndFull(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Write enough segments to fill the congestion window before ACK'ing
|
|
// any of them.
|
|
view := buffer.NewView(10)
|
|
for i := tcp.InitialCwnd; i > 0; i-- {
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
}
|
|
|
|
next := uint32(c.IRS) + 1
|
|
for i := tcp.InitialCwnd; i > 0; i-- {
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(len(view)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
next += uint32(len(view))
|
|
}
|
|
|
|
// Shutdown the connection, check that the FIN segment isn't sent
|
|
// because the congestion window doesn't allow it. Wait until a
|
|
// retransmit is received.
|
|
if err := c.EP.Shutdown(tcpip.ShutdownWrite); err != nil {
|
|
t.Fatalf("Unexpected error from Shutdown: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(len(view)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
// Send the ACK that will allow the FIN to be sent as well.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
next++
|
|
|
|
// Send a FIN that acknowledges everything. Get an ACK back.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck | header.TCPFlagFin,
|
|
SeqNum: 790,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(791),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestFinWithPendingData(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Write something out, and acknowledge it to get cwnd to 2.
|
|
view := buffer.NewView(10)
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
next := uint32(c.IRS) + 1
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(len(view)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
next += uint32(len(view))
|
|
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Write new data, but don't acknowledge it.
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(len(view)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
next += uint32(len(view))
|
|
|
|
// Shutdown the connection, check that we do get a FIN.
|
|
if err := c.EP.Shutdown(tcpip.ShutdownWrite); err != nil {
|
|
t.Fatalf("Unexpected error from Shutdown: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
next++
|
|
|
|
// Send a FIN that acknowledges everything. Get an ACK back.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck | header.TCPFlagFin,
|
|
SeqNum: 790,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(791),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestFinWithPartialAck(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Write something out, and acknowledge it to get cwnd to 2. Also send
|
|
// FIN from the test side.
|
|
view := buffer.NewView(10)
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
next := uint32(c.IRS) + 1
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(len(view)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
next += uint32(len(view))
|
|
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck | header.TCPFlagFin,
|
|
SeqNum: 790,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that we get an ACK for the fin.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(791),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
// Write new data, but don't acknowledge it.
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(len(view)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(791),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
next += uint32(len(view))
|
|
|
|
// Shutdown the connection, check that we do get a FIN.
|
|
if err := c.EP.Shutdown(tcpip.ShutdownWrite); err != nil {
|
|
t.Fatalf("Unexpected error from Shutdown: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(791),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
next++
|
|
|
|
// Send an ACK for the data, but not for the FIN yet.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 791,
|
|
AckNum: seqnum.Value(next - 1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that we don't get a retransmit of the FIN.
|
|
c.CheckNoPacketTimeout("FIN retransmitted when data was ack'd", 100*time.Millisecond)
|
|
|
|
// Ack the FIN.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck | header.TCPFlagFin,
|
|
SeqNum: 791,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
|
|
func TestExponentialIncreaseDuringSlowStart(t *testing.T) {
|
|
maxPayload := 10
|
|
c := context.New(t, uint32(header.TCPMinimumSize+header.IPv4MinimumSize+maxPayload))
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
const iterations = 7
|
|
data := buffer.NewView(maxPayload * (tcp.InitialCwnd << (iterations + 1)))
|
|
for i := range data {
|
|
data[i] = byte(i)
|
|
}
|
|
|
|
// Write all the data in one shot. Packets will only be written at the
|
|
// MTU size though.
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(data), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
expected := tcp.InitialCwnd
|
|
bytesRead := 0
|
|
for i := 0; i < iterations; i++ {
|
|
// Read all packets expected on this iteration. Don't
|
|
// acknowledge any of them just yet, so that we can measure the
|
|
// congestion window.
|
|
for j := 0; j < expected; j++ {
|
|
c.ReceiveAndCheckPacket(data, bytesRead, maxPayload)
|
|
bytesRead += maxPayload
|
|
}
|
|
|
|
// Check we don't receive any more packets on this iteration.
|
|
// The timeout can't be too high or we'll trigger a timeout.
|
|
c.CheckNoPacketTimeout("More packets received than expected for this cwnd.", 50*time.Millisecond)
|
|
|
|
// Acknowledge all the data received so far.
|
|
c.SendAck(790, bytesRead)
|
|
|
|
// Double the number of expected packets for the next iteration.
|
|
expected *= 2
|
|
}
|
|
}
|
|
|
|
func TestCongestionAvoidance(t *testing.T) {
|
|
maxPayload := 10
|
|
c := context.New(t, uint32(header.TCPMinimumSize+header.IPv4MinimumSize+maxPayload))
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
const iterations = 7
|
|
data := buffer.NewView(2 * maxPayload * (tcp.InitialCwnd << (iterations + 1)))
|
|
for i := range data {
|
|
data[i] = byte(i)
|
|
}
|
|
|
|
// Write all the data in one shot. Packets will only be written at the
|
|
// MTU size though.
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(data), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Do slow start for a few iterations.
|
|
expected := tcp.InitialCwnd
|
|
bytesRead := 0
|
|
for i := 0; i < iterations; i++ {
|
|
expected = tcp.InitialCwnd << uint(i)
|
|
if i > 0 {
|
|
// Acknowledge all the data received so far if not on
|
|
// first iteration.
|
|
c.SendAck(790, bytesRead)
|
|
}
|
|
|
|
// Read all packets expected on this iteration. Don't
|
|
// acknowledge any of them just yet, so that we can measure the
|
|
// congestion window.
|
|
for j := 0; j < expected; j++ {
|
|
c.ReceiveAndCheckPacket(data, bytesRead, maxPayload)
|
|
bytesRead += maxPayload
|
|
}
|
|
|
|
// Check we don't receive any more packets on this iteration.
|
|
// The timeout can't be too high or we'll trigger a timeout.
|
|
c.CheckNoPacketTimeout("More packets received than expected for this cwnd.", 50*time.Millisecond)
|
|
}
|
|
|
|
// Don't acknowledge the first packet of the last packet train. Let's
|
|
// wait for them to time out, which will trigger a restart of slow
|
|
// start, and initialization of ssthresh to cwnd/2.
|
|
rtxOffset := bytesRead - maxPayload*expected
|
|
c.ReceiveAndCheckPacket(data, rtxOffset, maxPayload)
|
|
|
|
// Acknowledge all the data received so far.
|
|
c.SendAck(790, bytesRead)
|
|
|
|
// This part is tricky: when the timeout happened, we had "expected"
|
|
// packets pending, cwnd reset to 1, and ssthresh set to expected/2.
|
|
// By acknowledging "expected" packets, the slow-start part will
|
|
// increase cwnd to expected/2 (which "consumes" expected/2-1 of the
|
|
// acknowledgements), then the congestion avoidance part will consume
|
|
// an extra expected/2 acks to take cwnd to expected/2 + 1. One ack
|
|
// remains in the "ack count" (which will cause cwnd to be incremented
|
|
// once it reaches cwnd acks).
|
|
//
|
|
// So we're straight into congestion avoidance with cwnd set to
|
|
// expected/2 + 1.
|
|
//
|
|
// Check that packets trains of cwnd packets are sent, and that cwnd is
|
|
// incremented by 1 after we acknowledge each packet.
|
|
expected = expected/2 + 1
|
|
for i := 0; i < iterations; i++ {
|
|
// Read all packets expected on this iteration. Don't
|
|
// acknowledge any of them just yet, so that we can measure the
|
|
// congestion window.
|
|
for j := 0; j < expected; j++ {
|
|
c.ReceiveAndCheckPacket(data, bytesRead, maxPayload)
|
|
bytesRead += maxPayload
|
|
}
|
|
|
|
// Check we don't receive any more packets on this iteration.
|
|
// The timeout can't be too high or we'll trigger a timeout.
|
|
c.CheckNoPacketTimeout("More packets received than expected for this cwnd.", 50*time.Millisecond)
|
|
|
|
// Acknowledge all the data received so far.
|
|
c.SendAck(790, bytesRead)
|
|
|
|
// In cogestion avoidance, the packets trains increase by 1 in
|
|
// each iteration.
|
|
expected++
|
|
}
|
|
}
|
|
|
|
func TestFastRecovery(t *testing.T) {
|
|
maxPayload := 10
|
|
c := context.New(t, uint32(header.TCPMinimumSize+header.IPv4MinimumSize+maxPayload))
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
const iterations = 7
|
|
data := buffer.NewView(2 * maxPayload * (tcp.InitialCwnd << (iterations + 1)))
|
|
for i := range data {
|
|
data[i] = byte(i)
|
|
}
|
|
|
|
// Write all the data in one shot. Packets will only be written at the
|
|
// MTU size though.
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(data), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Do slow start for a few iterations.
|
|
expected := tcp.InitialCwnd
|
|
bytesRead := 0
|
|
for i := 0; i < iterations; i++ {
|
|
expected = tcp.InitialCwnd << uint(i)
|
|
if i > 0 {
|
|
// Acknowledge all the data received so far if not on
|
|
// first iteration.
|
|
c.SendAck(790, bytesRead)
|
|
}
|
|
|
|
// Read all packets expected on this iteration. Don't
|
|
// acknowledge any of them just yet, so that we can measure the
|
|
// congestion window.
|
|
for j := 0; j < expected; j++ {
|
|
c.ReceiveAndCheckPacket(data, bytesRead, maxPayload)
|
|
bytesRead += maxPayload
|
|
}
|
|
|
|
// Check we don't receive any more packets on this iteration.
|
|
// The timeout can't be too high or we'll trigger a timeout.
|
|
c.CheckNoPacketTimeout("More packets received than expected for this cwnd.", 50*time.Millisecond)
|
|
}
|
|
|
|
// Send 3 duplicate acks. This should force an immediate retransmit of
|
|
// the pending packet and put the sender into fast recovery.
|
|
rtxOffset := bytesRead - maxPayload*expected
|
|
for i := 0; i < 3; i++ {
|
|
c.SendAck(790, rtxOffset)
|
|
}
|
|
|
|
// Receive the retransmitted packet.
|
|
c.ReceiveAndCheckPacket(data, rtxOffset, maxPayload)
|
|
|
|
// Now send 7 mode duplicate acks. Each of these should cause a window
|
|
// inflation by 1 and cause the sender to send an extra packet.
|
|
for i := 0; i < 7; i++ {
|
|
c.SendAck(790, rtxOffset)
|
|
}
|
|
|
|
recover := bytesRead
|
|
|
|
// Ensure no new packets arrive.
|
|
c.CheckNoPacketTimeout("More packets received than expected during recovery after dupacks for this cwnd.",
|
|
50*time.Millisecond)
|
|
|
|
// Acknowledge half of the pending data.
|
|
rtxOffset = bytesRead - expected*maxPayload/2
|
|
c.SendAck(790, rtxOffset)
|
|
|
|
// Receive the retransmit due to partial ack.
|
|
c.ReceiveAndCheckPacket(data, rtxOffset, maxPayload)
|
|
|
|
// Receive the 10 extra packets that should have been released due to
|
|
// the congestion window inflation in recovery.
|
|
for i := 0; i < 10; i++ {
|
|
c.ReceiveAndCheckPacket(data, bytesRead, maxPayload)
|
|
bytesRead += maxPayload
|
|
}
|
|
|
|
// A partial ACK during recovery should reduce congestion window by the
|
|
// number acked. Since we had "expected" packets outstanding before sending
|
|
// partial ack and we acked expected/2 , the cwnd and outstanding should
|
|
// be expected/2 + 7. Which means the sender should not send any more packets
|
|
// till we ack this one.
|
|
c.CheckNoPacketTimeout("More packets received than expected during recovery after partial ack for this cwnd.",
|
|
50*time.Millisecond)
|
|
|
|
// Acknowledge all pending data to recover point.
|
|
c.SendAck(790, recover)
|
|
|
|
// At this point, the cwnd should reset to expected/2 and there are 10
|
|
// packets outstanding.
|
|
//
|
|
// NOTE: Technically netstack is incorrect in that we adjust the cwnd on
|
|
// the same segment that takes us out of recovery. But because of that
|
|
// the actual cwnd at exit of recovery will be expected/2 + 1 as we
|
|
// acked a cwnd worth of packets which will increase the cwnd further by
|
|
// 1 in congestion avoidance.
|
|
//
|
|
// Now in the first iteration since there are 10 packets outstanding.
|
|
// We would expect to get expected/2 +1 - 10 packets. But subsequent
|
|
// iterations will send us expected/2 + 1 + 1 (per iteration).
|
|
expected = expected/2 + 1 - 10
|
|
for i := 0; i < iterations; i++ {
|
|
// Read all packets expected on this iteration. Don't
|
|
// acknowledge any of them just yet, so that we can measure the
|
|
// congestion window.
|
|
for j := 0; j < expected; j++ {
|
|
c.ReceiveAndCheckPacket(data, bytesRead, maxPayload)
|
|
bytesRead += maxPayload
|
|
}
|
|
|
|
// Check we don't receive any more packets on this iteration.
|
|
// The timeout can't be too high or we'll trigger a timeout.
|
|
c.CheckNoPacketTimeout(fmt.Sprintf("More packets received(after deflation) than expected %d for this cwnd.", expected), 50*time.Millisecond)
|
|
|
|
// Acknowledge all the data received so far.
|
|
c.SendAck(790, bytesRead)
|
|
|
|
// In cogestion avoidance, the packets trains increase by 1 in
|
|
// each iteration.
|
|
if i == 0 {
|
|
// After the first iteration we expect to get the full
|
|
// congestion window worth of packets in every
|
|
// iteration.
|
|
expected += 10
|
|
}
|
|
expected++
|
|
}
|
|
}
|
|
|
|
func TestRetransmit(t *testing.T) {
|
|
maxPayload := 10
|
|
c := context.New(t, uint32(header.TCPMinimumSize+header.IPv4MinimumSize+maxPayload))
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
const iterations = 7
|
|
data := buffer.NewView(maxPayload * (tcp.InitialCwnd << (iterations + 1)))
|
|
for i := range data {
|
|
data[i] = byte(i)
|
|
}
|
|
|
|
// Write all the data in two shots. Packets will only be written at the
|
|
// MTU size though.
|
|
half := data[:len(data)/2]
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(half), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
half = data[len(data)/2:]
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(half), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Do slow start for a few iterations.
|
|
expected := tcp.InitialCwnd
|
|
bytesRead := 0
|
|
for i := 0; i < iterations; i++ {
|
|
expected = tcp.InitialCwnd << uint(i)
|
|
if i > 0 {
|
|
// Acknowledge all the data received so far if not on
|
|
// first iteration.
|
|
c.SendAck(790, bytesRead)
|
|
}
|
|
|
|
// Read all packets expected on this iteration. Don't
|
|
// acknowledge any of them just yet, so that we can measure the
|
|
// congestion window.
|
|
for j := 0; j < expected; j++ {
|
|
c.ReceiveAndCheckPacket(data, bytesRead, maxPayload)
|
|
bytesRead += maxPayload
|
|
}
|
|
|
|
// Check we don't receive any more packets on this iteration.
|
|
// The timeout can't be too high or we'll trigger a timeout.
|
|
c.CheckNoPacketTimeout("More packets received than expected for this cwnd.", 50*time.Millisecond)
|
|
}
|
|
|
|
// Wait for a timeout and retransmit.
|
|
rtxOffset := bytesRead - maxPayload*expected
|
|
c.ReceiveAndCheckPacket(data, rtxOffset, maxPayload)
|
|
|
|
// Acknowledge half of the pending data.
|
|
rtxOffset = bytesRead - expected*maxPayload/2
|
|
c.SendAck(790, rtxOffset)
|
|
|
|
// Receive the remaining data, making sure that acknowledged data is not
|
|
// retransmitted.
|
|
for offset := rtxOffset; offset < len(data); offset += maxPayload {
|
|
c.ReceiveAndCheckPacket(data, offset, maxPayload)
|
|
c.SendAck(790, offset+maxPayload)
|
|
}
|
|
|
|
c.CheckNoPacketTimeout("More packets received than expected for this cwnd.", 50*time.Millisecond)
|
|
}
|
|
|
|
func TestUpdateListenBacklog(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Create listener.
|
|
var wq waiter.Queue
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Bind(tcpip.FullAddress{}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Listen(10); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
// Update the backlog with another Listen() on the same endpoint.
|
|
if err := ep.Listen(20); err != nil {
|
|
t.Fatalf("Listen failed to update backlog: %v", err)
|
|
}
|
|
|
|
ep.Close()
|
|
}
|
|
|
|
func scaledSendWindow(t *testing.T, scale uint8) {
|
|
// This test ensures that the endpoint is using the right scaling by
|
|
// sending a buffer that is larger than the window size, and ensuring
|
|
// that the endpoint doesn't send more than allowed.
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
maxPayload := defaultMTU - header.IPv4MinimumSize - header.TCPMinimumSize
|
|
c.CreateConnectedWithRawOptions(789, 0, nil, []byte{
|
|
header.TCPOptionMSS, 4, byte(maxPayload / 256), byte(maxPayload % 256),
|
|
header.TCPOptionWS, 3, scale, header.TCPOptionNOP,
|
|
})
|
|
|
|
// Open up the window with a scaled value.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 1,
|
|
})
|
|
|
|
// Send some data. Check that it's capped by the window size.
|
|
view := buffer.NewView(65535)
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Unexpected error from Write: %v", err)
|
|
}
|
|
|
|
// Check that only data that fits in the scaled window is sent.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen((1<<scale)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
// Reset the connection to free resources.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagRst,
|
|
SeqNum: 790,
|
|
})
|
|
}
|
|
|
|
func TestScaledSendWindow(t *testing.T) {
|
|
for scale := uint8(0); scale <= 14; scale++ {
|
|
scaledSendWindow(t, scale)
|
|
}
|
|
}
|
|
|
|
func TestReceivedSegmentQueuing(t *testing.T) {
|
|
// This test sends 200 segments containing a few bytes each to an
|
|
// endpoint and checks that they're all received and acknowledged by
|
|
// the endpoint, that is, that none of the segments are dropped by
|
|
// internal queues.
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Send 200 segments.
|
|
data := []byte{1, 2, 3}
|
|
for i := 0; i < 200; i++ {
|
|
c.SendPacket(data, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: seqnum.Value(790 + i*len(data)),
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
|
|
// Receive ACKs for all segments.
|
|
last := seqnum.Value(790 + 200*len(data))
|
|
for {
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
tcp := header.TCP(header.IPv4(b).Payload())
|
|
ack := seqnum.Value(tcp.AckNumber())
|
|
if ack == last {
|
|
break
|
|
}
|
|
|
|
if last.LessThan(ack) {
|
|
t.Fatalf("Acknowledge (%v) beyond the expected (%v)", ack, last)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestReadAfterClosedState(t *testing.T) {
|
|
// This test ensures that calling Read() or Peek() after the endpoint
|
|
// has transitioned to closedState still works if there is pending
|
|
// data. To transition to stateClosed without calling Close(), we must
|
|
// shutdown the send path and the peer must send its own FIN.
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
c.WQ.EventRegister(&we, waiter.EventIn)
|
|
defer c.WQ.EventUnregister(&we)
|
|
|
|
if _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
|
|
t.Fatalf("Unexpected error from Read: %v", err)
|
|
}
|
|
|
|
// Shutdown immediately for write, check that we get a FIN.
|
|
if err := c.EP.Shutdown(tcpip.ShutdownWrite); err != nil {
|
|
t.Fatalf("Unexpected error from Shutdown: %v", err)
|
|
}
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
|
|
// Send some data and acknowledge the FIN.
|
|
data := []byte{1, 2, 3}
|
|
c.SendPacket(data, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck | header.TCPFlagFin,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(2),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that ACK is received.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+2),
|
|
checker.AckNum(uint32(791+len(data))),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
|
|
// Give the stack the chance to transition to closed state.
|
|
time.Sleep(1 * time.Second)
|
|
|
|
// Wait for receive to be notified.
|
|
select {
|
|
case <-ch:
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for data to arrive")
|
|
}
|
|
|
|
// Check that peek works.
|
|
peekBuf := make([]byte, 10)
|
|
n, err := c.EP.Peek([][]byte{peekBuf})
|
|
if err != nil {
|
|
t.Fatalf("Unexpected error from Peek: %v", err)
|
|
}
|
|
|
|
peekBuf = peekBuf[:n]
|
|
if bytes.Compare(data, peekBuf) != 0 {
|
|
t.Fatalf("Data is different: expected %v, got %v", data, peekBuf)
|
|
}
|
|
|
|
// Receive data.
|
|
v, err := c.EP.Read(nil)
|
|
if err != nil {
|
|
t.Fatalf("Unexpected error from Read: %v", err)
|
|
}
|
|
|
|
if bytes.Compare(data, v) != 0 {
|
|
t.Fatalf("Data is different: expected %v, got %v", data, v)
|
|
}
|
|
|
|
// Now that we drained the queue, check that functions fail with the
|
|
// right error code.
|
|
if _, err := c.EP.Read(nil); err != tcpip.ErrClosedForReceive {
|
|
t.Fatalf("Unexpected return from Read: got %v, want %v", err, tcpip.ErrClosedForReceive)
|
|
}
|
|
|
|
if _, err := c.EP.Peek([][]byte{peekBuf}); err != tcpip.ErrClosedForReceive {
|
|
t.Fatalf("Unexpected return from Peek: got %v, want %v", err, tcpip.ErrClosedForReceive)
|
|
}
|
|
}
|
|
|
|
func TestReusePort(t *testing.T) {
|
|
// This test ensures that ports are immediately available for reuse
|
|
// after Close on the endpoints using them returns.
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// First case, just an endpoint that was bound.
|
|
var err *tcpip.Error
|
|
c.EP, err = c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
if err := c.EP.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
c.EP.Close()
|
|
c.EP, err = c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
if err := c.EP.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
c.EP.Close()
|
|
|
|
// Second case, an endpoint that was bound and is connecting..
|
|
c.EP, err = c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
if err := c.EP.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
err = c.EP.Connect(tcpip.FullAddress{Addr: context.TestAddr, Port: context.TestPort})
|
|
if err != tcpip.ErrConnectStarted {
|
|
t.Fatalf("Unexpected return value from Connect: %v", err)
|
|
}
|
|
c.EP.Close()
|
|
|
|
c.EP, err = c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
if err := c.EP.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
c.EP.Close()
|
|
|
|
// Third case, an endpoint that was bound and is listening.
|
|
c.EP, err = c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
if err := c.EP.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
err = c.EP.Listen(10)
|
|
if err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
c.EP.Close()
|
|
|
|
c.EP, err = c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
if err := c.EP.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
err = c.EP.Listen(10)
|
|
if err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
}
|
|
|
|
func checkRecvBufferSize(t *testing.T, ep tcpip.Endpoint, v int) {
|
|
t.Helper()
|
|
|
|
var s tcpip.ReceiveBufferSizeOption
|
|
if err := ep.GetSockOpt(&s); err != nil {
|
|
t.Fatalf("GetSockOpt failed: %v", err)
|
|
}
|
|
|
|
if int(s) != v {
|
|
t.Fatalf("Bad receive buffer size: want=%v, got=%v", v, s)
|
|
}
|
|
}
|
|
|
|
func checkSendBufferSize(t *testing.T, ep tcpip.Endpoint, v int) {
|
|
t.Helper()
|
|
|
|
var s tcpip.SendBufferSizeOption
|
|
if err := ep.GetSockOpt(&s); err != nil {
|
|
t.Fatalf("GetSockOpt failed: %v", err)
|
|
}
|
|
|
|
if int(s) != v {
|
|
t.Fatalf("Bad send buffer size: want=%v, got=%v", v, s)
|
|
}
|
|
}
|
|
|
|
func TestDefaultBufferSizes(t *testing.T) {
|
|
s := stack.New([]string{ipv4.ProtocolName}, []string{tcp.ProtocolName})
|
|
|
|
// Check the default values.
|
|
ep, err := s.NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
defer func() {
|
|
if ep != nil {
|
|
ep.Close()
|
|
}
|
|
}()
|
|
|
|
checkSendBufferSize(t, ep, tcp.DefaultBufferSize)
|
|
checkRecvBufferSize(t, ep, tcp.DefaultBufferSize)
|
|
|
|
// Change the default send buffer size.
|
|
if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.SendBufferSizeOption{1, tcp.DefaultBufferSize * 2, tcp.DefaultBufferSize * 20}); err != nil {
|
|
t.Fatalf("SetTransportProtocolOption failed: %v", err)
|
|
}
|
|
|
|
ep.Close()
|
|
ep, err = s.NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
|
|
checkSendBufferSize(t, ep, tcp.DefaultBufferSize*2)
|
|
checkRecvBufferSize(t, ep, tcp.DefaultBufferSize)
|
|
|
|
// Change the default receive buffer size.
|
|
if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.ReceiveBufferSizeOption{1, tcp.DefaultBufferSize * 3, tcp.DefaultBufferSize * 30}); err != nil {
|
|
t.Fatalf("SetTransportProtocolOption failed: %v", err)
|
|
}
|
|
|
|
ep.Close()
|
|
ep, err = s.NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
|
|
checkSendBufferSize(t, ep, tcp.DefaultBufferSize*2)
|
|
checkRecvBufferSize(t, ep, tcp.DefaultBufferSize*3)
|
|
}
|
|
|
|
func TestMinMaxBufferSizes(t *testing.T) {
|
|
s := stack.New([]string{ipv4.ProtocolName}, []string{tcp.ProtocolName})
|
|
|
|
// Check the default values.
|
|
ep, err := s.NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed; %v", err)
|
|
}
|
|
defer ep.Close()
|
|
|
|
// Change the min/max values for send/receive
|
|
if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.ReceiveBufferSizeOption{200, tcp.DefaultBufferSize * 2, tcp.DefaultBufferSize * 20}); err != nil {
|
|
t.Fatalf("SetTransportProtocolOption failed: %v", err)
|
|
}
|
|
|
|
if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.SendBufferSizeOption{300, tcp.DefaultBufferSize * 3, tcp.DefaultBufferSize * 30}); err != nil {
|
|
t.Fatalf("SetTransportProtocolOption failed: %v", err)
|
|
}
|
|
|
|
// Set values below the min.
|
|
if err := ep.SetSockOpt(tcpip.ReceiveBufferSizeOption(199)); err != nil {
|
|
t.Fatalf("GetSockOpt failed: %v", err)
|
|
}
|
|
|
|
checkRecvBufferSize(t, ep, 200)
|
|
|
|
if err := ep.SetSockOpt(tcpip.SendBufferSizeOption(299)); err != nil {
|
|
t.Fatalf("GetSockOpt failed: %v", err)
|
|
}
|
|
|
|
checkSendBufferSize(t, ep, 300)
|
|
|
|
// Set values above the max.
|
|
if err := ep.SetSockOpt(tcpip.ReceiveBufferSizeOption(1 + tcp.DefaultBufferSize*20)); err != nil {
|
|
t.Fatalf("GetSockOpt failed: %v", err)
|
|
}
|
|
|
|
checkRecvBufferSize(t, ep, tcp.DefaultBufferSize*20)
|
|
|
|
if err := ep.SetSockOpt(tcpip.SendBufferSizeOption(1 + tcp.DefaultBufferSize*30)); err != nil {
|
|
t.Fatalf("GetSockOpt failed: %v", err)
|
|
}
|
|
|
|
checkSendBufferSize(t, ep, tcp.DefaultBufferSize*30)
|
|
}
|
|
|
|
func TestSelfConnect(t *testing.T) {
|
|
// This test ensures that intentional self-connects work. In particular,
|
|
// it checks that if an endpoint binds to say 127.0.0.1:1000 then
|
|
// connects to 127.0.0.1:1000, then it will be connected to itself, and
|
|
// is able to send and receive data through the same endpoint.
|
|
s := stack.New([]string{ipv4.ProtocolName}, []string{tcp.ProtocolName})
|
|
|
|
id := loopback.New()
|
|
if testing.Verbose() {
|
|
id = sniffer.New(id)
|
|
}
|
|
|
|
if err := s.CreateNIC(1, id); err != nil {
|
|
t.Fatalf("CreateNIC failed: %v", err)
|
|
}
|
|
|
|
if err := s.AddAddress(1, ipv4.ProtocolNumber, context.StackAddr); err != nil {
|
|
t.Fatalf("AddAddress failed: %v", err)
|
|
}
|
|
|
|
s.SetRouteTable([]tcpip.Route{
|
|
{
|
|
Destination: "\x00\x00\x00\x00",
|
|
Mask: "\x00\x00\x00\x00",
|
|
Gateway: "",
|
|
NIC: 1,
|
|
},
|
|
})
|
|
|
|
var wq waiter.Queue
|
|
ep, err := s.NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
defer ep.Close()
|
|
|
|
if err := ep.Bind(tcpip.FullAddress{Port: context.StackPort}, nil); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
// Register for notification, then start connection attempt.
|
|
waitEntry, notifyCh := waiter.NewChannelEntry(nil)
|
|
wq.EventRegister(&waitEntry, waiter.EventOut)
|
|
defer wq.EventUnregister(&waitEntry)
|
|
|
|
err = ep.Connect(tcpip.FullAddress{Addr: context.StackAddr, Port: context.StackPort})
|
|
if err != tcpip.ErrConnectStarted {
|
|
t.Fatalf("Unexpected return value from Connect: %v", err)
|
|
}
|
|
|
|
<-notifyCh
|
|
err = ep.GetSockOpt(tcpip.ErrorOption{})
|
|
if err != nil {
|
|
t.Fatalf("Connect failed: %v", err)
|
|
}
|
|
|
|
// Write something.
|
|
data := []byte{1, 2, 3}
|
|
view := buffer.NewView(len(data))
|
|
copy(view, data)
|
|
if _, err = ep.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Write failed: %v", err)
|
|
}
|
|
|
|
// Read back what was written.
|
|
wq.EventUnregister(&waitEntry)
|
|
wq.EventRegister(&waitEntry, waiter.EventIn)
|
|
rd, err := ep.Read(nil)
|
|
if err != nil {
|
|
if err != tcpip.ErrWouldBlock {
|
|
t.Fatalf("Read failed: %v", err)
|
|
}
|
|
<-notifyCh
|
|
rd, err = ep.Read(nil)
|
|
if err != nil {
|
|
t.Fatalf("Read failed: %v", err)
|
|
}
|
|
}
|
|
|
|
if bytes.Compare(data, rd) != 0 {
|
|
t.Fatalf("Data is different: want=%v, got=%v", data, rd)
|
|
}
|
|
}
|
|
|
|
func TestPathMTUDiscovery(t *testing.T) {
|
|
// This test verifies the stack retransmits packets after it receives an
|
|
// ICMP packet indicating that the path MTU has been exceeded.
|
|
c := context.New(t, 1500)
|
|
defer c.Cleanup()
|
|
|
|
// Create new connection with MSS of 1460.
|
|
const maxPayload = 1500 - header.TCPMinimumSize - header.IPv4MinimumSize
|
|
c.CreateConnectedWithRawOptions(789, 30000, nil, []byte{
|
|
header.TCPOptionMSS, 4, byte(maxPayload / 256), byte(maxPayload % 256),
|
|
})
|
|
|
|
// Send 3200 bytes of data.
|
|
const writeSize = 3200
|
|
data := buffer.NewView(writeSize)
|
|
for i := range data {
|
|
data[i] = byte(i)
|
|
}
|
|
|
|
if _, err := c.EP.Write(tcpip.SlicePayload(data), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Write failed: %v", err)
|
|
}
|
|
|
|
receivePackets := func(c *context.Context, sizes []int, which int, seqNum uint32) []byte {
|
|
var ret []byte
|
|
for i, size := range sizes {
|
|
p := c.GetPacket()
|
|
if i == which {
|
|
ret = p
|
|
}
|
|
checker.IPv4(t, p,
|
|
checker.PayloadLen(size+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(seqNum),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
seqNum += uint32(size)
|
|
}
|
|
return ret
|
|
}
|
|
|
|
// Receive three packets.
|
|
sizes := []int{maxPayload, maxPayload, writeSize - 2*maxPayload}
|
|
first := receivePackets(c, sizes, 0, uint32(c.IRS)+1)
|
|
|
|
// Send "packet too big" messages back to netstack.
|
|
const newMTU = 1200
|
|
const newMaxPayload = newMTU - header.IPv4MinimumSize - header.TCPMinimumSize
|
|
mtu := []byte{0, 0, newMTU / 256, newMTU % 256}
|
|
c.SendICMPPacket(header.ICMPv4DstUnreachable, header.ICMPv4FragmentationNeeded, mtu, first, newMTU)
|
|
|
|
// See retransmitted packets. None exceeding the new max.
|
|
sizes = []int{newMaxPayload, maxPayload - newMaxPayload, newMaxPayload, maxPayload - newMaxPayload, writeSize - 2*maxPayload}
|
|
receivePackets(c, sizes, -1, uint32(c.IRS)+1)
|
|
}
|
|
|
|
func TestTCPEndpointProbe(t *testing.T) {
|
|
c := context.New(t, 1500)
|
|
defer c.Cleanup()
|
|
|
|
invoked := make(chan struct{})
|
|
c.Stack().AddTCPProbe(func(state stack.TCPEndpointState) {
|
|
// Validate that the endpoint ID is what we expect.
|
|
//
|
|
// We don't do an extensive validation of every field but a
|
|
// basic sanity test.
|
|
if got, want := state.ID.LocalAddress, tcpip.Address(context.StackAddr); got != want {
|
|
t.Fatalf("unexpected LocalAddress got: %d, want: %d", got, want)
|
|
}
|
|
if got, want := state.ID.LocalPort, c.Port; got != want {
|
|
t.Fatalf("unexpected LocalPort got: %d, want: %d", got, want)
|
|
}
|
|
if got, want := state.ID.RemoteAddress, tcpip.Address(context.TestAddr); got != want {
|
|
t.Fatalf("unexpected RemoteAddress got: %d, want: %d", got, want)
|
|
}
|
|
if got, want := state.ID.RemotePort, uint16(context.TestPort); got != want {
|
|
t.Fatalf("unexpected RemotePort got: %d, want: %d", got, want)
|
|
}
|
|
|
|
invoked <- struct{}{}
|
|
})
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
data := []byte{1, 2, 3}
|
|
c.SendPacket(data, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
select {
|
|
case <-invoked:
|
|
case <-time.After(100 * time.Millisecond):
|
|
t.Fatalf("TCP Probe function was not called")
|
|
}
|
|
}
|