68 lines
2.5 KiB
Go
68 lines
2.5 KiB
Go
// Copyright 2020 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcp_timewait_reset_test
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import (
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"flag"
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"testing"
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"time"
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"golang.org/x/sys/unix"
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"gvisor.dev/gvisor/pkg/tcpip/header"
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"gvisor.dev/gvisor/test/packetimpact/testbench"
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)
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func init() {
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testbench.Initialize(flag.CommandLine)
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}
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// TestTimeWaitReset tests handling of RST when in TIME_WAIT state.
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func TestTimeWaitReset(t *testing.T) {
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dut := testbench.NewDUT(t)
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listenFD, remotePort := dut.CreateListener(t, unix.SOCK_STREAM, unix.IPPROTO_TCP, 1 /*backlog*/)
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defer dut.Close(t, listenFD)
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conn := dut.Net.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort})
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defer conn.Close(t)
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conn.Connect(t)
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acceptFD, _ := dut.Accept(t, listenFD)
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// Trigger active close.
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dut.Close(t, acceptFD)
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_, err := conn.Expect(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagFin | header.TCPFlagAck)}, time.Second)
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if err != nil {
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t.Fatalf("expected a FIN: %s", err)
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}
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conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagAck)})
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// Send a FIN, DUT should transition to TIME_WAIT from FIN_WAIT2.
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conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagFin | header.TCPFlagAck)})
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if _, err := conn.Expect(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagAck)}, time.Second); err != nil {
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t.Fatalf("expected an ACK for our FIN: %s", err)
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}
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// Send a RST, the DUT should transition to CLOSED from TIME_WAIT.
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// This is the default Linux behavior, it can be changed to ignore RSTs via
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// sysctl net.ipv4.tcp_rfc1337.
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conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagRst)})
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conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagAck)})
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// The DUT should reply with RST to our ACK as the state should have
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// transitioned to CLOSED.
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if _, err := conn.Expect(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagRst)}, time.Second); err != nil {
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t.Fatalf("expected a RST: %s", err)
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}
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}
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