gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/test/packetimpact/tests/tcp_synsent_reset_test.go (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package tcp_synsent_reset_test
    16  
    17  import (
    18  	"flag"
    19  	"testing"
    20  	"time"
    21  
    22  	"golang.org/x/sys/unix"
    23  	"gvisor.dev/gvisor/pkg/abi/linux"
    24  	"gvisor.dev/gvisor/pkg/tcpip/header"
    25  	"gvisor.dev/gvisor/test/packetimpact/testbench"
    26  )
    27  
    28  func init() {
    29  	testbench.Initialize(flag.CommandLine)
    30  }
    31  
    32  // dutSynSentState sets up the dut connection in SYN-SENT state.
    33  func dutSynSentState(t *testing.T) (*testbench.DUT, *testbench.TCPIPv4, int32, uint16, uint16) {
    34  	t.Helper()
    35  
    36  	dut := testbench.NewDUT(t)
    37  
    38  	clientFD, clientPort := dut.CreateBoundSocket(t, unix.SOCK_STREAM|unix.SOCK_NONBLOCK, unix.IPPROTO_TCP, dut.Net.RemoteIPv4)
    39  	port := uint16(9001)
    40  	conn := dut.Net.NewTCPIPv4(t, testbench.TCP{SrcPort: &port, DstPort: &clientPort}, testbench.TCP{SrcPort: &clientPort, DstPort: &port})
    41  
    42  	sa := unix.SockaddrInet4{Port: int(port)}
    43  	copy(sa.Addr[:], dut.Net.LocalIPv4)
    44  	// Bring the dut to SYN-SENT state with a non-blocking connect.
    45  	dut.Connect(t, clientFD, &sa)
    46  	if _, err := conn.ExpectData(t, &testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagSyn)}, nil, time.Second); err != nil {
    47  		t.Fatalf("expected SYN\n")
    48  	}
    49  
    50  	return &dut, &conn, clientFD, port, clientPort
    51  }
    52  
    53  // TestTCPSynSentReset tests RFC793, p67: SYN-SENT to CLOSED transition.
    54  func TestTCPSynSentReset(t *testing.T) {
    55  	dut, conn, fd, _, _ := dutSynSentState(t)
    56  	defer conn.Close(t)
    57  	conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagRst | header.TCPFlagAck)})
    58  	// Expect the connection to have closed.
    59  	conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagAck)})
    60  	if _, err := conn.ExpectData(t, &testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagRst)}, nil, time.Second); err != nil {
    61  		t.Fatalf("expected a TCP RST")
    62  	}
    63  	info := dut.GetSockOptTCPInfo(t, fd)
    64  	if got, want := uint32(info.State), linux.TCP_CLOSE; got != want {
    65  		t.Fatalf("got %d want %d", got, want)
    66  	}
    67  }
    68  
    69  // TestTCPSynSentRcvdReset tests RFC793, p70, SYN-SENT to SYN-RCVD to CLOSED
    70  // transitions.
    71  func TestTCPSynSentRcvdReset(t *testing.T) {
    72  	dut, c, fd, remotePort, clientPort := dutSynSentState(t)
    73  	defer c.Close(t)
    74  
    75  	conn := dut.Net.NewTCPIPv4(t, testbench.TCP{SrcPort: &remotePort, DstPort: &clientPort}, testbench.TCP{SrcPort: &clientPort, DstPort: &remotePort})
    76  	defer conn.Close(t)
    77  	// Initiate new SYN connection with the same port pair
    78  	// (simultaneous open case), expect the dut connection to move to
    79  	// SYN-RCVD state
    80  	conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagSyn)})
    81  	if _, err := conn.ExpectData(t, &testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagSyn | header.TCPFlagAck)}, nil, time.Second); err != nil {
    82  		t.Fatalf("expected SYN-ACK %s\n", err)
    83  	}
    84  	conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagRst)})
    85  	// Expect the connection to have transitioned SYN-RCVD to CLOSED.
    86  	conn.Send(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagAck)})
    87  	if _, err := conn.ExpectData(t, &testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagRst)}, nil, time.Second); err != nil {
    88  		t.Fatalf("expected a TCP RST")
    89  	}
    90  	info := dut.GetSockOptTCPInfo(t, fd)
    91  	if got, want := uint32(info.State), linux.TCP_CLOSE; got != want {
    92  		t.Fatalf("got %d want %d", got, want)
    93  	}
    94  }