3829 lines
104 KiB
Go
3829 lines
104 KiB
Go
// Copyright 2018 The gVisor Authors.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package tcp_test
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"math"
|
|
"testing"
|
|
"time"
|
|
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/checker"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/header"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/link/loopback"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/link/sniffer"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/network/ipv4"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/network/ipv6"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/ports"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/seqnum"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/tcp"
|
|
"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/tcp/testing/context"
|
|
"gvisor.googlesource.com/gvisor/pkg/waiter"
|
|
)
|
|
|
|
const (
|
|
// defaultMTU is the MTU, in bytes, used throughout the tests, except
|
|
// where another value is explicitly used. It is chosen to match the MTU
|
|
// of loopback interfaces on linux systems.
|
|
defaultMTU = 65535
|
|
|
|
// defaultIPv4MSS is the MSS sent by the network stack in SYN/SYN-ACK for an
|
|
// IPv4 endpoint when the MTU is set to defaultMTU in the test.
|
|
defaultIPv4MSS = defaultMTU - header.IPv4MinimumSize - header.TCPMinimumSize
|
|
)
|
|
|
|
func TestGiveUpConnect(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
var wq waiter.Queue
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
|
|
// Register for notification, then start connection attempt.
|
|
waitEntry, notifyCh := waiter.NewChannelEntry(nil)
|
|
wq.EventRegister(&waitEntry, waiter.EventOut)
|
|
defer wq.EventUnregister(&waitEntry)
|
|
|
|
if err := ep.Connect(tcpip.FullAddress{Addr: context.TestAddr, Port: context.TestPort}); err != tcpip.ErrConnectStarted {
|
|
t.Fatalf("got ep.Connect(...) = %v, want = %v", err, tcpip.ErrConnectStarted)
|
|
}
|
|
|
|
// Close the connection, wait for completion.
|
|
ep.Close()
|
|
|
|
// Wait for ep to become writable.
|
|
<-notifyCh
|
|
if err := ep.GetSockOpt(tcpip.ErrorOption{}); err != tcpip.ErrAborted {
|
|
t.Fatalf("got ep.GetSockOpt(tcpip.ErrorOption{}) = %v, want = %v", err, tcpip.ErrAborted)
|
|
}
|
|
}
|
|
|
|
func TestConnectIncrementActiveConnection(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
stats := c.Stack().Stats()
|
|
want := stats.TCP.ActiveConnectionOpenings.Value() + 1
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
if got := stats.TCP.ActiveConnectionOpenings.Value(); got != want {
|
|
t.Errorf("got stats.TCP.ActtiveConnectionOpenings.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestConnectDoesNotIncrementFailedConnectionAttempts(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
stats := c.Stack().Stats()
|
|
want := stats.TCP.FailedConnectionAttempts.Value()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
if got := stats.TCP.FailedConnectionAttempts.Value(); got != want {
|
|
t.Errorf("got stats.TCP.FailedConnectionOpenings.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestActiveFailedConnectionAttemptIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
stats := c.Stack().Stats()
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &c.WQ)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
c.EP = ep
|
|
want := stats.TCP.FailedConnectionAttempts.Value() + 1
|
|
|
|
if err := c.EP.Connect(tcpip.FullAddress{NIC: 2, Addr: context.TestAddr, Port: context.TestPort}); err != tcpip.ErrNoRoute {
|
|
t.Errorf("got c.EP.Connect(...) = %v, want = %v", err, tcpip.ErrNoRoute)
|
|
}
|
|
|
|
if got := stats.TCP.FailedConnectionAttempts.Value(); got != want {
|
|
t.Errorf("got stats.TCP.FailedConnectionAttempts.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestTCPSegmentsSentIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
stats := c.Stack().Stats()
|
|
// SYN and ACK
|
|
want := stats.TCP.SegmentsSent.Value() + 2
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
if got := stats.TCP.SegmentsSent.Value(); got != want {
|
|
t.Errorf("got stats.TCP.SegmentsSent.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestTCPResetsSentIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
stats := c.Stack().Stats()
|
|
wq := &waiter.Queue{}
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
want := stats.TCP.SegmentsSent.Value() + 1
|
|
|
|
if err := ep.Bind(tcpip.FullAddress{Port: context.StackPort}); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
if err := ep.Listen(10); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
// Send a SYN request.
|
|
iss := seqnum.Value(789)
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagSyn,
|
|
SeqNum: iss,
|
|
})
|
|
|
|
// Receive the SYN-ACK reply.
|
|
b := c.GetPacket()
|
|
tcp := header.TCP(header.IPv4(b).Payload())
|
|
c.IRS = seqnum.Value(tcp.SequenceNumber())
|
|
|
|
ackHeaders := &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: iss + 1,
|
|
// If the AckNum is not the increment of the last sequence number, a RST
|
|
// segment is sent back in response.
|
|
AckNum: c.IRS + 2,
|
|
}
|
|
|
|
// Send ACK.
|
|
c.SendPacket(nil, ackHeaders)
|
|
|
|
c.GetPacket()
|
|
if got := stats.TCP.ResetsSent.Value(); got != want {
|
|
t.Errorf("got stats.TCP.ResetsSent.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestTCPResetsReceivedIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
stats := c.Stack().Stats()
|
|
want := stats.TCP.ResetsReceived.Value() + 1
|
|
ackNum := seqnum.Value(789)
|
|
rcvWnd := seqnum.Size(30000)
|
|
c.CreateConnected(ackNum, rcvWnd, nil)
|
|
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
SeqNum: c.IRS.Add(2),
|
|
AckNum: ackNum.Add(2),
|
|
RcvWnd: rcvWnd,
|
|
Flags: header.TCPFlagRst,
|
|
})
|
|
|
|
if got := stats.TCP.ResetsReceived.Value(); got != want {
|
|
t.Errorf("got stats.TCP.ResetsReceived.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestActiveHandshake(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
}
|
|
|
|
func TestNonBlockingClose(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
ep := c.EP
|
|
c.EP = nil
|
|
|
|
// Close the endpoint 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 TestConnectResetAfterClose(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
ep := c.EP
|
|
c.EP = nil
|
|
|
|
// Close the endpoint, make sure we get a FIN segment, then acknowledge
|
|
// to complete closure of sender, but don't send our own FIN.
|
|
ep.Close()
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
),
|
|
)
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Wait for the ep to give up waiting for a FIN, and send a RST.
|
|
time.Sleep(3 * time.Second)
|
|
for {
|
|
b := c.GetPacket()
|
|
tcp := header.TCP(header.IPv4(b).Payload())
|
|
if tcp.Flags() == header.TCPFlagAck|header.TCPFlagFin {
|
|
// This is a retransmit of the FIN, ignore it.
|
|
continue
|
|
}
|
|
|
|
checker.IPv4(t, b,
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagRst),
|
|
),
|
|
)
|
|
break
|
|
}
|
|
}
|
|
|
|
func TestSimpleReceive(t *testing.T) {
|
|
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("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
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,
|
|
})
|
|
|
|
// Wait for receive to be notified.
|
|
select {
|
|
case <-ch:
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for data to arrive")
|
|
}
|
|
|
|
// Receive data.
|
|
v, _, err := c.EP.Read(nil)
|
|
if err != nil {
|
|
t.Fatalf("Read failed: %v", err)
|
|
}
|
|
|
|
if !bytes.Equal(data, v) {
|
|
t.Fatalf("got data = %v, want = %v", v, data)
|
|
}
|
|
|
|
// Check that ACK is received.
|
|
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),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestOutOfOrderReceive(t *testing.T) {
|
|
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("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
// Send second half of data first, with seqnum 3 ahead of expected.
|
|
data := []byte{1, 2, 3, 4, 5, 6}
|
|
c.SendPacket(data[3:], &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 793,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that we get an ACK specifying which seqnum is expected.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
|
|
// Wait 200ms and check that no data has been received.
|
|
time.Sleep(200 * time.Millisecond)
|
|
if _, _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
|
|
t.Fatalf("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
// Send the first 3 bytes now.
|
|
c.SendPacket(data[:3], &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Receive data.
|
|
read := make([]byte, 0, 6)
|
|
for len(read) < len(data) {
|
|
v, _, err := c.EP.Read(nil)
|
|
if err != nil {
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for receive to be notified.
|
|
select {
|
|
case <-ch:
|
|
case <-time.After(5 * time.Second):
|
|
t.Fatalf("Timed out waiting for data to arrive")
|
|
}
|
|
continue
|
|
}
|
|
t.Fatalf("Read failed: %v", err)
|
|
}
|
|
|
|
read = append(read, v...)
|
|
}
|
|
|
|
// Check that we received the data in proper order.
|
|
if !bytes.Equal(data, read) {
|
|
t.Fatalf("got data = %v, want = %v", read, data)
|
|
}
|
|
|
|
// Check that the whole data is acknowledged.
|
|
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),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestOutOfOrderFlood(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Create a new connection with initial window size of 10.
|
|
opt := tcpip.ReceiveBufferSizeOption(10)
|
|
c.CreateConnected(789, 30000, &opt)
|
|
|
|
if _, _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
|
|
t.Fatalf("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
// Send 100 packets before the actual one that is expected.
|
|
data := []byte{1, 2, 3, 4, 5, 6}
|
|
for i := 0; i < 100; i++ {
|
|
c.SendPacket(data[3:], &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 796,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
// Send packet with seqnum 793. It must be discarded because the
|
|
// out-of-order buffer was filled by the previous packets.
|
|
c.SendPacket(data[3:], &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 793,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
|
|
// Now send the expected packet, seqnum 790.
|
|
c.SendPacket(data[:3], &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Check that only packet 790 is acknowledged.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
checker.AckNum(793),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestRstOnCloseWithUnreadData(t *testing.T) {
|
|
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("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
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,
|
|
})
|
|
|
|
// Wait for receive to be notified.
|
|
select {
|
|
case <-ch:
|
|
case <-time.After(3 * time.Second):
|
|
t.Fatalf("Timed out waiting for data to arrive")
|
|
}
|
|
|
|
// Check that ACK is received, this happens regardless of the read.
|
|
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),
|
|
),
|
|
)
|
|
|
|
// Now that we know we have unread data, let's just close the connection
|
|
// and verify that netstack sends an RST rather than a FIN.
|
|
c.EP.Close()
|
|
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagRst),
|
|
// We shouldn't consume a sequence number on RST.
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
))
|
|
|
|
// This final should be ignored because an ACK on a reset doesn't
|
|
// mean anything.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: seqnum.Value(790 + len(data)),
|
|
AckNum: c.IRS.Add(seqnum.Size(2)),
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
|
|
func TestRstOnCloseWithUnreadDataFinConvertRst(t *testing.T) {
|
|
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("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
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,
|
|
})
|
|
|
|
// Wait for receive to be notified.
|
|
select {
|
|
case <-ch:
|
|
case <-time.After(3 * time.Second):
|
|
t.Fatalf("Timed out waiting for data to arrive")
|
|
}
|
|
|
|
// Check that ACK is received, this happens regardless of the read.
|
|
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),
|
|
),
|
|
)
|
|
|
|
// Cause a FIN to be generated.
|
|
c.EP.Shutdown(tcpip.ShutdownWrite)
|
|
|
|
// Make sure we get the FIN but DON't ACK IT.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagFin),
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
))
|
|
|
|
// Cause a RST to be generated by closing the read end now since we have
|
|
// unread data.
|
|
c.EP.Shutdown(tcpip.ShutdownRead)
|
|
|
|
// Make sure we get the RST
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagRst),
|
|
// We shouldn't consume a sequence number on RST.
|
|
checker.SeqNum(uint32(c.IRS)+1),
|
|
))
|
|
|
|
// The ACK to the FIN should now be rejected since the connection has been
|
|
// closed by a RST.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: seqnum.Value(790 + len(data)),
|
|
AckNum: c.IRS.Add(seqnum.Size(2)),
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
|
|
func TestShutdownRead(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
if _, _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
|
|
t.Fatalf("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
if err := c.EP.Shutdown(tcpip.ShutdownRead); err != nil {
|
|
t.Fatalf("Shutdown failed: %v", err)
|
|
}
|
|
|
|
if _, _, err := c.EP.Read(nil); err != tcpip.ErrClosedForReceive {
|
|
t.Fatalf("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrClosedForReceive)
|
|
}
|
|
}
|
|
|
|
func TestFullWindowReceive(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
opt := tcpip.ReceiveBufferSizeOption(10)
|
|
c.CreateConnected(789, 30000, &opt)
|
|
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
c.WQ.EventRegister(&we, waiter.EventIn)
|
|
defer c.WQ.EventUnregister(&we)
|
|
|
|
_, _, err := c.EP.Read(nil)
|
|
if err != tcpip.ErrWouldBlock {
|
|
t.Fatalf("Read failed: %v", err)
|
|
}
|
|
|
|
// Fill up the window.
|
|
data := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
|
|
c.SendPacket(data, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Wait for receive to be notified.
|
|
select {
|
|
case <-ch:
|
|
case <-time.After(5 * time.Second):
|
|
t.Fatalf("Timed out waiting for data to arrive")
|
|
}
|
|
|
|
// Check that data is acknowledged, and window goes to zero.
|
|
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.
|
|
v, _, err := c.EP.Read(nil)
|
|
if err != nil {
|
|
t.Fatalf("Read failed: %v", err)
|
|
}
|
|
|
|
if !bytes.Equal(data, v) {
|
|
t.Fatalf("got data = %v, want = %v", v, data)
|
|
}
|
|
|
|
// Check that we get an ACK for the newly non-zero window.
|
|
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(10),
|
|
),
|
|
)
|
|
}
|
|
|
|
func TestNoWindowShrinking(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
// Start off with a window size of 10, then shrink it to 5.
|
|
opt := tcpip.ReceiveBufferSizeOption(10)
|
|
c.CreateConnected(789, 30000, &opt)
|
|
|
|
opt = 5
|
|
if err := c.EP.SetSockOpt(opt); err != nil {
|
|
t.Fatalf("SetSockOpt failed: %v", err)
|
|
}
|
|
|
|
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("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
// Send 3 bytes, check that the peer acknowledges them.
|
|
data := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
|
|
c.SendPacket(data[:3], &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Wait for receive to be notified.
|
|
select {
|
|
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("Read failed: %v", err)
|
|
}
|
|
|
|
read = append(read, v...)
|
|
}
|
|
|
|
if !bytes.Equal(data, read) {
|
|
t.Fatalf("got data = %v, want = %v", read, data)
|
|
}
|
|
|
|
// 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("Write failed: %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.Equal(data, p) {
|
|
t.Fatalf("got data = %v, want = %v", p, data)
|
|
}
|
|
|
|
// 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("Write failed: %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.Equal(data, p) {
|
|
t.Fatalf("got data = %v, want = %v", p, data)
|
|
}
|
|
|
|
// 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("Write failed: %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("Write failed: %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}); 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("Write failed: %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}); 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("Write failed: %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("Read failed: %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 TestSegmentMerging(t *testing.T) {
|
|
tests := []struct {
|
|
name string
|
|
stop func(tcpip.Endpoint)
|
|
resume func(tcpip.Endpoint)
|
|
}{
|
|
{
|
|
"stop work",
|
|
func(ep tcpip.Endpoint) {
|
|
ep.(interface{ StopWork() }).StopWork()
|
|
},
|
|
func(ep tcpip.Endpoint) {
|
|
ep.(interface{ ResumeWork() }).ResumeWork()
|
|
},
|
|
},
|
|
{
|
|
"cork",
|
|
func(ep tcpip.Endpoint) {
|
|
ep.SetSockOpt(tcpip.CorkOption(1))
|
|
},
|
|
func(ep tcpip.Endpoint) {
|
|
ep.SetSockOpt(tcpip.CorkOption(0))
|
|
},
|
|
},
|
|
}
|
|
|
|
for _, test := range tests {
|
|
t.Run(test.name, func(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
// Prevent the endpoint from processing packets.
|
|
test.stop(c.EP)
|
|
|
|
var allData []byte
|
|
for i, data := range [][]byte{{1, 2, 3, 4}, {5, 6, 7}, {8, 9}, {10}, {11}} {
|
|
allData = append(allData, data...)
|
|
view := buffer.NewViewFromBytes(data)
|
|
if _, _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Write #%d failed: %v", i+1, err)
|
|
}
|
|
}
|
|
|
|
// Let the endpoint process the segments that we just sent.
|
|
test.resume(c.EP)
|
|
|
|
// Check that data is received.
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.PayloadLen(len(allData)+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 got := b[header.IPv4MinimumSize+header.TCPMinimumSize:]; !bytes.Equal(got, allData) {
|
|
t.Fatalf("got data = %v, want = %v", got, allData)
|
|
}
|
|
|
|
// 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(allData))),
|
|
RcvWnd: 30000,
|
|
})
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestDelay(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
c.EP.SetSockOpt(tcpip.DelayOption(1))
|
|
|
|
var allData []byte
|
|
for i, data := range [][]byte{{0}, {1, 2, 3, 4}, {5, 6, 7}, {8, 9}, {10}, {11}} {
|
|
allData = append(allData, data...)
|
|
view := buffer.NewViewFromBytes(data)
|
|
if _, _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Write #%d failed: %v", i+1, err)
|
|
}
|
|
}
|
|
|
|
seq := c.IRS.Add(1)
|
|
for _, want := range [][]byte{allData[:1], allData[1:]} {
|
|
// Check that data is received.
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.PayloadLen(len(want)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(seq)),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
if got := b[header.IPv4MinimumSize+header.TCPMinimumSize:]; !bytes.Equal(got, want) {
|
|
t.Fatalf("got data = %v, want = %v", got, want)
|
|
}
|
|
|
|
seq = seq.Add(seqnum.Size(len(want)))
|
|
// Acknowledge the data.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: seq,
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestUndelay(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
c.EP.SetSockOpt(tcpip.DelayOption(1))
|
|
|
|
allData := [][]byte{{0}, {1, 2, 3}}
|
|
for i, data := range allData {
|
|
view := buffer.NewViewFromBytes(data)
|
|
if _, _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Write #%d failed: %v", i+1, err)
|
|
}
|
|
}
|
|
|
|
seq := c.IRS.Add(1)
|
|
|
|
// Check that data is received.
|
|
first := c.GetPacket()
|
|
checker.IPv4(t, first,
|
|
checker.PayloadLen(len(allData[0])+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(seq)),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
if got, want := first[header.IPv4MinimumSize+header.TCPMinimumSize:], allData[0]; !bytes.Equal(got, want) {
|
|
t.Fatalf("got first packet's data = %v, want = %v", got, want)
|
|
}
|
|
|
|
seq = seq.Add(seqnum.Size(len(allData[0])))
|
|
|
|
// Check that we don't get the second packet yet.
|
|
c.CheckNoPacketTimeout("delayed second packet transmitted", 100*time.Millisecond)
|
|
|
|
c.EP.SetSockOpt(tcpip.DelayOption(0))
|
|
|
|
// Check that data is received.
|
|
second := c.GetPacket()
|
|
checker.IPv4(t, second,
|
|
checker.PayloadLen(len(allData[1])+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(seq)),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
if got, want := second[header.IPv4MinimumSize+header.TCPMinimumSize:], allData[1]; !bytes.Equal(got, want) {
|
|
t.Fatalf("got second packet's data = %v, want = %v", got, want)
|
|
}
|
|
|
|
seq = seq.Add(seqnum.Size(len(allData[1])))
|
|
|
|
// Acknowledge the data.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: seq,
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
|
|
func TestMSSNotDelayed(t *testing.T) {
|
|
tests := []struct {
|
|
name string
|
|
fn func(tcpip.Endpoint)
|
|
}{
|
|
{"no-op", func(tcpip.Endpoint) {}},
|
|
{"delay", func(ep tcpip.Endpoint) { ep.SetSockOpt(tcpip.DelayOption(1)) }},
|
|
{"cork", func(ep tcpip.Endpoint) { ep.SetSockOpt(tcpip.CorkOption(1)) }},
|
|
}
|
|
|
|
for _, test := range tests {
|
|
t.Run(test.name, func(t *testing.T) {
|
|
const maxPayload = 100
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnectedWithRawOptions(789, 30000, nil, []byte{
|
|
header.TCPOptionMSS, 4, byte(maxPayload / 256), byte(maxPayload % 256),
|
|
})
|
|
|
|
test.fn(c.EP)
|
|
|
|
allData := [][]byte{{0}, make([]byte, maxPayload), make([]byte, maxPayload)}
|
|
for i, data := range allData {
|
|
view := buffer.NewViewFromBytes(data)
|
|
if _, _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Write #%d failed: %v", i+1, err)
|
|
}
|
|
}
|
|
|
|
seq := c.IRS.Add(1)
|
|
|
|
for i, data := range allData {
|
|
// Check that data is received.
|
|
packet := c.GetPacket()
|
|
checker.IPv4(t, packet,
|
|
checker.PayloadLen(len(data)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(seq)),
|
|
checker.AckNum(790),
|
|
checker.TCPFlagsMatch(header.TCPFlagAck, ^uint8(header.TCPFlagPsh)),
|
|
),
|
|
)
|
|
|
|
if got, want := packet[header.IPv4MinimumSize+header.TCPMinimumSize:], data; !bytes.Equal(got, want) {
|
|
t.Fatalf("got packet #%d's data = %v, want = %v", i+1, got, want)
|
|
}
|
|
|
|
seq = seq.Add(seqnum.Size(len(data)))
|
|
}
|
|
|
|
// Acknowledge the data.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: seq,
|
|
RcvWnd: 30000,
|
|
})
|
|
})
|
|
}
|
|
}
|
|
|
|
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("Write failed: %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.Equal(pdata, p) {
|
|
t.Fatalf("got data = %v, want = %v", p, pdata)
|
|
}
|
|
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}); 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}); 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)
|
|
|
|
if err := c.EP.Connect(tcpip.FullAddress{Addr: context.TestAddr, Port: context.TestPort}); err != tcpip.ErrConnectStarted {
|
|
t.Fatalf("got c.EP.Connect(...) = %v, want = %v", err, tcpip.ErrConnectStarted)
|
|
}
|
|
|
|
// Receive SYN packet.
|
|
b := c.GetPacket()
|
|
mss := uint16(mtu - header.IPv4MinimumSize - header.TCPMinimumSize)
|
|
checker.IPv4(t, b,
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.TCPFlags(header.TCPFlagSyn),
|
|
checker.TCPSynOptions(header.TCPSynOptions{MSS: mss, 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: mss, 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:
|
|
if err := c.EP.GetSockOpt(tcpip.ErrorOption{}); err != nil {
|
|
t.Fatalf("GetSockOpt failed: %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{}); 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 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("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrConnectionReset)
|
|
}
|
|
}
|
|
}
|
|
|
|
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)
|
|
if _, _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != tcpip.ErrConnectionReset {
|
|
t.Fatalf("got c.EP.Write(...) = %v, want = %v", err, tcpip.ErrConnectionReset)
|
|
}
|
|
}
|
|
|
|
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("Shutdown failed: %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("Shutdown failed: %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("Write failed: %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("Shutdown failed: %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("Write failed: %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("Shutdown failed: %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("Write failed: %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("Write failed: %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("Shutdown failed: %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("Write failed: %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("Write failed: %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("Shutdown failed: %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 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{}); 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("Write failed: %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 TestReceivedValidSegmentCountIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
c.CreateConnected(789, 30000, nil)
|
|
stats := c.Stack().Stats()
|
|
want := stats.TCP.ValidSegmentsReceived.Value() + 1
|
|
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: seqnum.Value(790),
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
if got := stats.TCP.ValidSegmentsReceived.Value(); got != want {
|
|
t.Errorf("got stats.TCP.ValidSegmentsReceived.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestReceivedInvalidSegmentCountIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
c.CreateConnected(789, 30000, nil)
|
|
stats := c.Stack().Stats()
|
|
want := stats.TCP.InvalidSegmentsReceived.Value() + 1
|
|
vv := c.BuildSegment(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: seqnum.Value(790),
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
tcpbuf := vv.First()[header.IPv4MinimumSize:]
|
|
tcpbuf[header.TCPDataOffset] = ((header.TCPMinimumSize - 1) / 4) << 4
|
|
|
|
c.SendSegment(vv)
|
|
|
|
if got := stats.TCP.InvalidSegmentsReceived.Value(); got != want {
|
|
t.Errorf("got stats.TCP.InvalidSegmentsReceived.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestReceivedIncorrectChecksumIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
c.CreateConnected(789, 30000, nil)
|
|
stats := c.Stack().Stats()
|
|
want := stats.TCP.ChecksumErrors.Value() + 1
|
|
vv := c.BuildSegment([]byte{0x1, 0x2, 0x3}, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: seqnum.Value(790),
|
|
AckNum: c.IRS.Add(1),
|
|
RcvWnd: 30000,
|
|
})
|
|
tcpbuf := vv.First()[header.IPv4MinimumSize:]
|
|
// Overwrite a byte in the payload which should cause checksum
|
|
// verification to fail.
|
|
tcpbuf[(tcpbuf[header.TCPDataOffset]>>4)*4] = 0x4
|
|
|
|
c.SendSegment(vv)
|
|
|
|
if got := stats.TCP.ChecksumErrors.Value(); got != want {
|
|
t.Errorf("got stats.TCP.ChecksumErrors.Value() = %d, want = %d", got, want)
|
|
}
|
|
}
|
|
|
|
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("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
// Shutdown immediately for write, check that we get a FIN.
|
|
if err := c.EP.Shutdown(tcpip.ShutdownWrite); err != nil {
|
|
t.Fatalf("Shutdown failed: %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("Peek failed: %v", err)
|
|
}
|
|
|
|
peekBuf = peekBuf[:n]
|
|
if !bytes.Equal(data, peekBuf) {
|
|
t.Fatalf("got data = %v, want = %v", peekBuf, data)
|
|
}
|
|
|
|
// Receive data.
|
|
v, _, err := c.EP.Read(nil)
|
|
if err != nil {
|
|
t.Fatalf("Read failed: %v", err)
|
|
}
|
|
|
|
if !bytes.Equal(data, v) {
|
|
t.Fatalf("got data = %v, want = %v", v, data)
|
|
}
|
|
|
|
// 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("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrClosedForReceive)
|
|
}
|
|
|
|
if _, _, err := c.EP.Peek([][]byte{peekBuf}); err != tcpip.ErrClosedForReceive {
|
|
t.Fatalf("got c.EP.Peek(...) = %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}); 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}); 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}); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
if err := c.EP.Connect(tcpip.FullAddress{Addr: context.TestAddr, Port: context.TestPort}); err != tcpip.ErrConnectStarted {
|
|
t.Fatalf("got c.EP.Connect(...) = %v, want = %v", err, tcpip.ErrConnectStarted)
|
|
}
|
|
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}); 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}); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
if err := c.EP.Listen(10); 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}); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
if err := c.EP.Listen(10); 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("got receive buffer size = %v, want = %v", s, v)
|
|
}
|
|
}
|
|
|
|
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("got send buffer size = %v, want = %v", s, v)
|
|
}
|
|
}
|
|
|
|
func TestDefaultBufferSizes(t *testing.T) {
|
|
s := stack.New([]string{ipv4.ProtocolName}, []string{tcp.ProtocolName}, stack.Options{})
|
|
|
|
// 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}, stack.Options{})
|
|
|
|
// 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 makeStack() (*stack.Stack, *tcpip.Error) {
|
|
s := stack.New([]string{
|
|
ipv4.ProtocolName,
|
|
ipv6.ProtocolName,
|
|
}, []string{tcp.ProtocolName}, stack.Options{})
|
|
|
|
id := loopback.New()
|
|
if testing.Verbose() {
|
|
id = sniffer.New(id)
|
|
}
|
|
|
|
if err := s.CreateNIC(1, id); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for _, ct := range []struct {
|
|
number tcpip.NetworkProtocolNumber
|
|
address tcpip.Address
|
|
}{
|
|
{ipv4.ProtocolNumber, context.StackAddr},
|
|
{ipv6.ProtocolNumber, context.StackV6Addr},
|
|
} {
|
|
if err := s.AddAddress(1, ct.number, ct.address); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
s.SetRouteTable([]tcpip.Route{
|
|
{
|
|
Destination: "\x00\x00\x00\x00",
|
|
Mask: "\x00\x00\x00\x00",
|
|
Gateway: "",
|
|
NIC: 1,
|
|
},
|
|
{
|
|
Destination: "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
|
|
Mask: "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
|
|
Gateway: "",
|
|
NIC: 1,
|
|
},
|
|
})
|
|
|
|
return s, nil
|
|
}
|
|
|
|
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, err := makeStack()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
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}); 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)
|
|
|
|
if err := ep.Connect(tcpip.FullAddress{Addr: context.StackAddr, Port: context.StackPort}); err != tcpip.ErrConnectStarted {
|
|
t.Fatalf("got ep.Connect(...) = %v, want = %v", err, tcpip.ErrConnectStarted)
|
|
}
|
|
|
|
<-notifyCh
|
|
if err := ep.GetSockOpt(tcpip.ErrorOption{}); 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.Equal(data, rd) {
|
|
t.Fatalf("got data = %v, want = %v", rd, data)
|
|
}
|
|
}
|
|
|
|
func TestConnectAvoidsBoundPorts(t *testing.T) {
|
|
addressTypes := func(t *testing.T, network string) []string {
|
|
switch network {
|
|
case "ipv4":
|
|
return []string{"v4"}
|
|
case "ipv6":
|
|
return []string{"v6"}
|
|
case "dual":
|
|
return []string{"v6", "mapped"}
|
|
default:
|
|
t.Fatalf("unknown network: '%s'", network)
|
|
}
|
|
|
|
panic("unreachable")
|
|
}
|
|
|
|
address := func(t *testing.T, addressType string, isAny bool) tcpip.Address {
|
|
switch addressType {
|
|
case "v4":
|
|
if isAny {
|
|
return ""
|
|
}
|
|
return context.StackAddr
|
|
case "v6":
|
|
if isAny {
|
|
return ""
|
|
}
|
|
return context.StackV6Addr
|
|
case "mapped":
|
|
if isAny {
|
|
return context.V4MappedWildcardAddr
|
|
}
|
|
return context.StackV4MappedAddr
|
|
default:
|
|
t.Fatalf("unknown address type: '%s'", addressType)
|
|
}
|
|
|
|
panic("unreachable")
|
|
}
|
|
// This test ensures that Endpoint.Connect doesn't select already-bound ports.
|
|
networks := []string{"ipv4", "ipv6", "dual"}
|
|
for _, exhaustedNetwork := range networks {
|
|
t.Run(fmt.Sprintf("exhaustedNetwork=%s", exhaustedNetwork), func(t *testing.T) {
|
|
for _, exhaustedAddressType := range addressTypes(t, exhaustedNetwork) {
|
|
t.Run(fmt.Sprintf("exhaustedAddressType=%s", exhaustedAddressType), func(t *testing.T) {
|
|
for _, isAny := range []bool{false, true} {
|
|
t.Run(fmt.Sprintf("isAny=%t", isAny), func(t *testing.T) {
|
|
for _, candidateNetwork := range networks {
|
|
t.Run(fmt.Sprintf("candidateNetwork=%s", candidateNetwork), func(t *testing.T) {
|
|
for _, candidateAddressType := range addressTypes(t, candidateNetwork) {
|
|
t.Run(fmt.Sprintf("candidateAddressType=%s", candidateAddressType), func(t *testing.T) {
|
|
s, err := makeStack()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
var wq waiter.Queue
|
|
var eps []tcpip.Endpoint
|
|
defer func() {
|
|
for _, ep := range eps {
|
|
ep.Close()
|
|
}
|
|
}()
|
|
makeEP := func(network string) tcpip.Endpoint {
|
|
var networkProtocolNumber tcpip.NetworkProtocolNumber
|
|
switch network {
|
|
case "ipv4":
|
|
networkProtocolNumber = ipv4.ProtocolNumber
|
|
case "ipv6", "dual":
|
|
networkProtocolNumber = ipv6.ProtocolNumber
|
|
default:
|
|
t.Fatalf("unknown network: '%s'", network)
|
|
}
|
|
ep, err := s.NewEndpoint(tcp.ProtocolNumber, networkProtocolNumber, &wq)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
eps = append(eps, ep)
|
|
switch network {
|
|
case "ipv4":
|
|
case "ipv6":
|
|
if err := ep.SetSockOpt(tcpip.V6OnlyOption(1)); err != nil {
|
|
t.Fatalf("SetSockOpt(V6OnlyOption(1)) failed: %v", err)
|
|
}
|
|
case "dual":
|
|
if err := ep.SetSockOpt(tcpip.V6OnlyOption(0)); err != nil {
|
|
t.Fatalf("SetSockOpt(V6OnlyOption(0)) failed: %v", err)
|
|
}
|
|
default:
|
|
t.Fatalf("unknown network: '%s'", network)
|
|
}
|
|
return ep
|
|
}
|
|
|
|
var v4reserved, v6reserved bool
|
|
switch exhaustedAddressType {
|
|
case "v4", "mapped":
|
|
v4reserved = true
|
|
case "v6":
|
|
v6reserved = true
|
|
// Dual stack sockets bound to v6 any reserve on v4 as
|
|
// well.
|
|
if isAny {
|
|
switch exhaustedNetwork {
|
|
case "ipv6":
|
|
case "dual":
|
|
v4reserved = true
|
|
default:
|
|
t.Fatalf("unknown address type: '%s'", exhaustedNetwork)
|
|
}
|
|
}
|
|
default:
|
|
t.Fatalf("unknown address type: '%s'", exhaustedAddressType)
|
|
}
|
|
var collides bool
|
|
switch candidateAddressType {
|
|
case "v4", "mapped":
|
|
collides = v4reserved
|
|
case "v6":
|
|
collides = v6reserved
|
|
default:
|
|
t.Fatalf("unknown address type: '%s'", candidateAddressType)
|
|
}
|
|
|
|
for i := ports.FirstEphemeral; i <= math.MaxUint16; i++ {
|
|
if makeEP(exhaustedNetwork).Bind(tcpip.FullAddress{Addr: address(t, exhaustedAddressType, isAny), Port: uint16(i)}); err != nil {
|
|
t.Fatalf("Bind(%d) failed: %v", i, err)
|
|
}
|
|
}
|
|
want := tcpip.ErrConnectStarted
|
|
if collides {
|
|
want = tcpip.ErrNoPortAvailable
|
|
}
|
|
if err := makeEP(candidateNetwork).Connect(tcpip.FullAddress{Addr: address(t, candidateAddressType, false), Port: 31337}); err != want {
|
|
t.Fatalf("got ep.Connect(..) = %v, want = %v", err, want)
|
|
}
|
|
})
|
|
}
|
|
})
|
|
}
|
|
})
|
|
}
|
|
})
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
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("got LocalAddress: %q, want: %q", got, want)
|
|
}
|
|
if got, want := state.ID.LocalPort, c.Port; got != want {
|
|
t.Fatalf("got LocalPort: %d, want: %d", got, want)
|
|
}
|
|
if got, want := state.ID.RemoteAddress, tcpip.Address(context.TestAddr); got != want {
|
|
t.Fatalf("got RemoteAddress: %q, want: %q", got, want)
|
|
}
|
|
if got, want := state.ID.RemotePort, uint16(context.TestPort); got != want {
|
|
t.Fatalf("got RemotePort: %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")
|
|
}
|
|
}
|
|
|
|
func TestSetCongestionControl(t *testing.T) {
|
|
testCases := []struct {
|
|
cc tcp.CongestionControlOption
|
|
mustPass bool
|
|
}{
|
|
{"reno", true},
|
|
{"cubic", true},
|
|
}
|
|
|
|
for _, tc := range testCases {
|
|
t.Run(fmt.Sprintf("SetTransportProtocolOption(.., %v)", tc.cc), func(t *testing.T) {
|
|
c := context.New(t, 1500)
|
|
defer c.Cleanup()
|
|
|
|
s := c.Stack()
|
|
|
|
if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tc.cc); err != nil && tc.mustPass {
|
|
t.Fatalf("s.SetTransportProtocolOption(%v, %v) = %v, want not-nil", tcp.ProtocolNumber, tc.cc, err)
|
|
}
|
|
|
|
var cc tcp.CongestionControlOption
|
|
if err := s.TransportProtocolOption(tcp.ProtocolNumber, &cc); err != nil {
|
|
t.Fatalf("s.TransportProtocolOption(%v, %v) = %v", tcp.ProtocolNumber, &cc, err)
|
|
}
|
|
if got, want := cc, tc.cc; got != want {
|
|
t.Fatalf("got congestion control: %v, want: %v", got, want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestAvailableCongestionControl(t *testing.T) {
|
|
c := context.New(t, 1500)
|
|
defer c.Cleanup()
|
|
|
|
s := c.Stack()
|
|
|
|
// Query permitted congestion control algorithms.
|
|
var aCC tcp.AvailableCongestionControlOption
|
|
if err := s.TransportProtocolOption(tcp.ProtocolNumber, &aCC); err != nil {
|
|
t.Fatalf("s.TransportProtocolOption(%v, %v) = %v", tcp.ProtocolNumber, &aCC, err)
|
|
}
|
|
if got, want := aCC, tcp.AvailableCongestionControlOption("reno cubic"); got != want {
|
|
t.Fatalf("got tcp.AvailableCongestionControlOption: %v, want: %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestSetAvailableCongestionControl(t *testing.T) {
|
|
c := context.New(t, 1500)
|
|
defer c.Cleanup()
|
|
|
|
s := c.Stack()
|
|
|
|
// Setting AvailableCongestionControlOption should fail.
|
|
aCC := tcp.AvailableCongestionControlOption("xyz")
|
|
if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &aCC); err == nil {
|
|
t.Fatalf("s.TransportProtocolOption(%v, %v) = nil, want non-nil", tcp.ProtocolNumber, &aCC)
|
|
}
|
|
|
|
// Verify that we still get the expected list of congestion control options.
|
|
var cc tcp.AvailableCongestionControlOption
|
|
if err := s.TransportProtocolOption(tcp.ProtocolNumber, &cc); err != nil {
|
|
t.Fatalf("s.TransportProtocolOption(%v, %v) = %v", tcp.ProtocolNumber, &cc, err)
|
|
}
|
|
if got, want := cc, tcp.AvailableCongestionControlOption("reno cubic"); got != want {
|
|
t.Fatalf("got tcp.AvailableCongestionControlOption: %v, want: %v", got, want)
|
|
}
|
|
}
|
|
|
|
func enableCUBIC(t *testing.T, c *context.Context) {
|
|
t.Helper()
|
|
opt := tcp.CongestionControlOption("cubic")
|
|
if err := c.Stack().SetTransportProtocolOption(tcp.ProtocolNumber, opt); err != nil {
|
|
t.Fatalf("c.s.SetTransportProtocolOption(tcp.ProtocolNumber, %v = %v", opt, err)
|
|
}
|
|
}
|
|
|
|
func TestKeepalive(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
c.CreateConnected(789, 30000, nil)
|
|
|
|
c.EP.SetSockOpt(tcpip.KeepaliveIdleOption(10 * time.Millisecond))
|
|
c.EP.SetSockOpt(tcpip.KeepaliveIntervalOption(10 * time.Millisecond))
|
|
c.EP.SetSockOpt(tcpip.KeepaliveCountOption(5))
|
|
c.EP.SetSockOpt(tcpip.KeepaliveEnabledOption(1))
|
|
|
|
// 5 unacked keepalives are sent. ACK each one, and check that the
|
|
// connection stays alive after 5.
|
|
for i := 0; i < 10; i++ {
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(c.IRS)),
|
|
checker.AckNum(uint32(790)),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
|
|
// Acknowledge the keepalive.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: c.IRS,
|
|
RcvWnd: 30000,
|
|
})
|
|
}
|
|
|
|
// Check that the connection is still alive.
|
|
if _, _, err := c.EP.Read(nil); err != tcpip.ErrWouldBlock {
|
|
t.Fatalf("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrWouldBlock)
|
|
}
|
|
|
|
// Send some data and wait before ACKing it. Keepalives should be disabled
|
|
// during this period.
|
|
view := buffer.NewView(3)
|
|
if _, _, err := c.EP.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}); err != nil {
|
|
t.Fatalf("Write failed: %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)),
|
|
),
|
|
)
|
|
|
|
// Wait for the packet to be retransmitted. Verify that no keepalives
|
|
// were sent.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.PayloadLen(len(view)+header.TCPMinimumSize),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(next),
|
|
checker.AckNum(790),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagPsh),
|
|
),
|
|
)
|
|
c.CheckNoPacket("Keepalive packet received while unACKed data is pending")
|
|
|
|
next += uint32(len(view))
|
|
|
|
// Send ACK. Keepalives should start sending again.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort,
|
|
DstPort: c.Port,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: 790,
|
|
AckNum: seqnum.Value(next),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Now receive 5 keepalives, but don't ACK them. The connection
|
|
// should be reset after 5.
|
|
for i := 0; i < 5; i++ {
|
|
b := c.GetPacket()
|
|
checker.IPv4(t, b,
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(next-1)),
|
|
checker.AckNum(uint32(790)),
|
|
checker.TCPFlags(header.TCPFlagAck),
|
|
),
|
|
)
|
|
}
|
|
|
|
// The connection should be terminated after 5 unacked keepalives.
|
|
checker.IPv4(t, c.GetPacket(),
|
|
checker.TCP(
|
|
checker.DstPort(context.TestPort),
|
|
checker.SeqNum(uint32(next)),
|
|
checker.AckNum(uint32(790)),
|
|
checker.TCPFlags(header.TCPFlagAck|header.TCPFlagRst),
|
|
),
|
|
)
|
|
|
|
if _, _, err := c.EP.Read(nil); err != tcpip.ErrConnectionReset {
|
|
t.Fatalf("got c.EP.Read(nil) = %v, want = %v", err, tcpip.ErrConnectionReset)
|
|
}
|
|
}
|
|
|
|
func executeHandshake(t *testing.T, c *context.Context, srcPort uint16, synCookieInUse bool) (irs, iss seqnum.Value) {
|
|
// Send a SYN request.
|
|
irs = seqnum.Value(789)
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: srcPort,
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagSyn,
|
|
SeqNum: irs,
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Receive the SYN-ACK reply.
|
|
b := c.GetPacket()
|
|
tcp := header.TCP(header.IPv4(b).Payload())
|
|
iss = seqnum.Value(tcp.SequenceNumber())
|
|
tcpCheckers := []checker.TransportChecker{
|
|
checker.SrcPort(context.StackPort),
|
|
checker.DstPort(srcPort),
|
|
checker.TCPFlags(header.TCPFlagAck | header.TCPFlagSyn),
|
|
checker.AckNum(uint32(irs) + 1),
|
|
}
|
|
|
|
if synCookieInUse {
|
|
// When cookies are in use window scaling is disabled.
|
|
tcpCheckers = append(tcpCheckers, checker.TCPSynOptions(header.TCPSynOptions{
|
|
WS: -1,
|
|
MSS: c.MSSWithoutOptions(),
|
|
}))
|
|
}
|
|
|
|
checker.IPv4(t, b, checker.TCP(tcpCheckers...))
|
|
|
|
// Send ACK.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: srcPort,
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: irs + 1,
|
|
AckNum: iss + 1,
|
|
RcvWnd: 30000,
|
|
})
|
|
return irs, iss
|
|
}
|
|
|
|
// TestListenBacklogFull tests that netstack does not complete handshakes if the
|
|
// listen backlog for the endpoint is full.
|
|
func TestListenBacklogFull(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
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)
|
|
}
|
|
|
|
// Bind to wildcard.
|
|
if err := c.EP.Bind(tcpip.FullAddress{Port: context.StackPort}); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
// Test acceptance.
|
|
// Start listening.
|
|
listenBacklog := 2
|
|
if err := c.EP.Listen(listenBacklog); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
for i := 0; i < listenBacklog; i++ {
|
|
executeHandshake(t, c, context.TestPort+uint16(i), false /*synCookieInUse */)
|
|
}
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
// Now execute one more handshake. This should not be completed and
|
|
// delivered on an Accept() call as the backlog is full at this point.
|
|
irs, iss := executeHandshake(t, c, context.TestPort+uint16(listenBacklog), false /* synCookieInUse */)
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
// Try to accept the connection.
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
c.WQ.EventRegister(&we, waiter.EventIn)
|
|
defer c.WQ.EventUnregister(&we)
|
|
|
|
for i := 0; i < listenBacklog; i++ {
|
|
_, _, err = c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
_, _, err = c.EP.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
}
|
|
|
|
// Now verify that there are no more connections that can be accepted.
|
|
_, _, err = c.EP.Accept()
|
|
if err != tcpip.ErrWouldBlock {
|
|
select {
|
|
case <-ch:
|
|
t.Fatalf("unexpected endpoint delivered on Accept: %+v", c.EP)
|
|
case <-time.After(1 * time.Second):
|
|
}
|
|
}
|
|
|
|
// Now craft the ACK again and verify that the connection is now ready
|
|
// to be accepted.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort + uint16(listenBacklog),
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: irs + 1,
|
|
AckNum: iss + 1,
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
newEP, _, err := c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
newEP, _, err = c.EP.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
// Now verify that the TCP socket is usable and in a connected state.
|
|
data := "Don't panic"
|
|
newEP.Write(tcpip.SlicePayload(buffer.NewViewFromBytes([]byte(data))), tcpip.WriteOptions{})
|
|
b := c.GetPacket()
|
|
tcp := header.TCP(header.IPv4(b).Payload())
|
|
if string(tcp.Payload()) != data {
|
|
t.Fatalf("Unexpected data: got %v, want %v", string(tcp.Payload()), data)
|
|
}
|
|
}
|
|
|
|
func TestListenBacklogFullSynCookieInUse(t *testing.T) {
|
|
saved := tcp.SynRcvdCountThreshold
|
|
defer func() {
|
|
tcp.SynRcvdCountThreshold = saved
|
|
}()
|
|
tcp.SynRcvdCountThreshold = 1
|
|
|
|
c := context.New(t, defaultMTU)
|
|
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)
|
|
}
|
|
|
|
// Bind to wildcard.
|
|
if err := c.EP.Bind(tcpip.FullAddress{Port: context.StackPort}); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
|
|
// Test acceptance.
|
|
// Start listening.
|
|
listenBacklog := 1
|
|
portOffset := uint16(0)
|
|
if err := c.EP.Listen(listenBacklog); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
executeHandshake(t, c, context.TestPort+portOffset, false)
|
|
portOffset++
|
|
// Wait for this to be delivered to the accept queue.
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
nonCookieIRS, nonCookieISS := executeHandshake(t, c, context.TestPort+portOffset, false)
|
|
|
|
// Since the backlog is full at this point this connection will not
|
|
// transition out of handshake and ignore the ACK.
|
|
//
|
|
// At this point there should be 1 completed connection in the backlog
|
|
// and one incomplete one pending for a final ACK and hence not ready to be
|
|
// delivered to the endpoint.
|
|
//
|
|
// Now execute one more handshake. This should not be completed and
|
|
// delivered on an Accept() call as the backlog is full at this point
|
|
// and there is already 1 pending endpoint.
|
|
//
|
|
// This one should use a SYN cookie as the synRcvdCount is equal to the
|
|
// SynRcvdCountThreshold.
|
|
time.Sleep(50 * time.Millisecond)
|
|
portOffset++
|
|
irs, iss := executeHandshake(t, c, context.TestPort+portOffset, true)
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
// Verify that there is only one acceptable connection at this point.
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
c.WQ.EventRegister(&we, waiter.EventIn)
|
|
defer c.WQ.EventUnregister(&we)
|
|
|
|
_, _, err = c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
_, _, err = c.EP.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
// Now verify that there are no more connections that can be accepted.
|
|
_, _, err = c.EP.Accept()
|
|
if err != tcpip.ErrWouldBlock {
|
|
select {
|
|
case <-ch:
|
|
t.Fatalf("unexpected endpoint delivered on Accept: %+v", c.EP)
|
|
case <-time.After(1 * time.Second):
|
|
}
|
|
}
|
|
|
|
// Now send an ACK for the half completed connection
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort + portOffset - 1,
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: nonCookieIRS + 1,
|
|
AckNum: nonCookieISS + 1,
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Verify that the connection is now delivered to the backlog.
|
|
_, _, err = c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
_, _, err = c.EP.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
// Finally send an ACK for the connection that used a cookie and verify that
|
|
// it's also completed and delivered.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: context.TestPort + portOffset,
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: irs,
|
|
AckNum: iss,
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
newEP, _, err := c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
newEP, _, err = c.EP.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
// Now verify that the TCP socket is usable and in a connected state.
|
|
data := "Don't panic"
|
|
newEP.Write(tcpip.SlicePayload(buffer.NewViewFromBytes([]byte(data))), tcpip.WriteOptions{})
|
|
b := c.GetPacket()
|
|
tcp := header.TCP(header.IPv4(b).Payload())
|
|
if string(tcp.Payload()) != data {
|
|
t.Fatalf("Unexpected data: got %v, want %v", string(tcp.Payload()), data)
|
|
}
|
|
}
|
|
|
|
func TestPassiveConnectionAttemptIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &c.WQ)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
c.EP = ep
|
|
if err := ep.Bind(tcpip.FullAddress{Addr: context.StackAddr, Port: context.StackPort}); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
if err := c.EP.Listen(1); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
stats := c.Stack().Stats()
|
|
want := stats.TCP.PassiveConnectionOpenings.Value() + 1
|
|
|
|
srcPort := uint16(context.TestPort)
|
|
executeHandshake(t, c, srcPort+1, false)
|
|
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
c.WQ.EventRegister(&we, waiter.EventIn)
|
|
defer c.WQ.EventUnregister(&we)
|
|
|
|
// Verify that there is only one acceptable connection at this point.
|
|
_, _, err = c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
_, _, err = c.EP.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
if got := stats.TCP.PassiveConnectionOpenings.Value(); got != want {
|
|
t.Errorf("got stats.TCP.PassiveConnectionOpenings.Value() = %v, want = %v", got, want)
|
|
}
|
|
}
|
|
|
|
func TestPassiveFailedConnectionAttemptIncrement(t *testing.T) {
|
|
c := context.New(t, defaultMTU)
|
|
defer c.Cleanup()
|
|
|
|
stats := c.Stack().Stats()
|
|
ep, err := c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &c.WQ)
|
|
if err != nil {
|
|
t.Fatalf("NewEndpoint failed: %v", err)
|
|
}
|
|
c.EP = ep
|
|
if err := c.EP.Bind(tcpip.FullAddress{Addr: context.StackAddr, Port: context.StackPort}); err != nil {
|
|
t.Fatalf("Bind failed: %v", err)
|
|
}
|
|
if err := c.EP.Listen(1); err != nil {
|
|
t.Fatalf("Listen failed: %v", err)
|
|
}
|
|
|
|
srcPort := uint16(context.TestPort)
|
|
// Now attempt 3 handshakes, the first two will fill up the accept and the SYN-RCVD
|
|
// queue for the endpoint.
|
|
executeHandshake(t, c, srcPort, false)
|
|
|
|
// Give time for the final ACK to be processed as otherwise the next handshake could
|
|
// get accepted before the previous one based on goroutine scheduling.
|
|
time.Sleep(50 * time.Millisecond)
|
|
irs, iss := executeHandshake(t, c, srcPort+1, false)
|
|
|
|
// Wait for a short while for the accepted connection to be delivered to
|
|
// the channel before trying to send the 3rd SYN.
|
|
time.Sleep(40 * time.Millisecond)
|
|
|
|
want := stats.TCP.ListenOverflowSynDrop.Value() + 1
|
|
|
|
// Now we will send one more SYN and this one should get dropped
|
|
// Send a SYN request.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: srcPort + 2,
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagSyn,
|
|
SeqNum: seqnum.Value(789),
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
if got := stats.TCP.ListenOverflowSynDrop.Value(); got != want {
|
|
t.Errorf("got stats.TCP.ListenOverflowSynDrop.Value() = %v, want = %v", got, want)
|
|
}
|
|
|
|
we, ch := waiter.NewChannelEntry(nil)
|
|
c.WQ.EventRegister(&we, waiter.EventIn)
|
|
defer c.WQ.EventUnregister(&we)
|
|
|
|
// Now check that there is one acceptable connections.
|
|
_, _, err = c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
_, _, err = c.EP.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
// Now complete the next connection in SYN-RCVD state as it should
|
|
// have dropped the final ACK to the handshake due to accept queue
|
|
// being full.
|
|
c.SendPacket(nil, &context.Headers{
|
|
SrcPort: srcPort + 1,
|
|
DstPort: context.StackPort,
|
|
Flags: header.TCPFlagAck,
|
|
SeqNum: irs + 1,
|
|
AckNum: iss + 1,
|
|
RcvWnd: 30000,
|
|
})
|
|
|
|
// Now check that there is one more acceptable connections.
|
|
_, _, err = c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
_, _, err = c.EP.Accept()
|
|
if err != nil {
|
|
t.Fatalf("Accept failed: %v", err)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
t.Fatalf("Timed out waiting for accept")
|
|
}
|
|
}
|
|
|
|
// Try and accept a 3rd one this should fail.
|
|
_, _, err = c.EP.Accept()
|
|
if err == tcpip.ErrWouldBlock {
|
|
// Wait for connection to be established.
|
|
select {
|
|
case <-ch:
|
|
ep, _, err = c.EP.Accept()
|
|
if err == nil {
|
|
t.Fatalf("Accept succeeded when it should have failed got: %+v", ep)
|
|
}
|
|
|
|
case <-time.After(1 * time.Second):
|
|
}
|
|
}
|
|
}
|