2 files changed, 110 insertions, 0 deletions
diff --git a/test/packetimpact/tests/BUILD b/test/packetimpact/tests/BUILD
index 690cee140..1410512e6 100644
--- a/test/packetimpact/tests/BUILD
+++ b/test/packetimpact/tests/BUILD
@@ -88,6 +88,16 @@ packetimpact_go_test(
     ],
 )
 
+packetimpact_go_test(
+    name = "tcp_user_timeout",
+    srcs = ["tcp_user_timeout_test.go"],
+    deps = [
+        "//pkg/tcpip/header",
+        "//test/packetimpact/testbench",
+        "@org_golang_x_sys//unix:go_default_library",
+    ],
+)
+
 sh_binary(
     name = "test_runner",
     srcs = ["test_runner.sh"],
diff --git a/test/packetimpact/tests/tcp_user_timeout_test.go b/test/packetimpact/tests/tcp_user_timeout_test.go
new file mode 100644
index 000000000..3cf82badb
--- /dev/null
+++ b/test/packetimpact/tests/tcp_user_timeout_test.go
@@ -0,0 +1,100 @@
+// Copyright 2020 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_user_timeout_test
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"golang.org/x/sys/unix"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+	tb "gvisor.dev/gvisor/test/packetimpact/testbench"
+)
+
+func sendPayload(conn *tb.TCPIPv4, dut *tb.DUT, fd int32) error {
+	sampleData := make([]byte, 100)
+	for i := range sampleData {
+		sampleData[i] = uint8(i)
+	}
+	conn.Drain()
+	dut.Send(fd, sampleData, 0)
+	if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}, &tb.Payload{Bytes: sampleData}, time.Second); err != nil {
+		return fmt.Errorf("expected data but got none: %w", err)
+	}
+	return nil
+}
+
+func sendFIN(conn *tb.TCPIPv4, dut *tb.DUT, fd int32) error {
+	dut.Close(fd)
+	return nil
+}
+
+func TestTCPUserTimeout(t *testing.T) {
+	for _, tt := range []struct {
+		description string
+		userTimeout time.Duration
+		sendDelay   time.Duration
+	}{
+		{"NoUserTimeout", 0, 3 * time.Second},
+		{"ACKBeforeUserTimeout", 5 * time.Second, 4 * time.Second},
+		{"ACKAfterUserTimeout", 5 * time.Second, 7 * time.Second},
+	} {
+		for _, ttf := range []struct {
+			description string
+			f           func(conn *tb.TCPIPv4, dut *tb.DUT, fd int32) error
+		}{
+			{"AfterPayload", sendPayload},
+			{"AfterFIN", sendFIN},
+		} {
+			t.Run(tt.description+ttf.description, func(t *testing.T) {
+				// Create a socket, listen, TCP handshake, and accept.
+				dut := tb.NewDUT(t)
+				defer dut.TearDown()
+				listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1)
+				defer dut.Close(listenFD)
+				conn := tb.NewTCPIPv4(t, tb.TCP{DstPort: &remotePort}, tb.TCP{SrcPort: &remotePort})
+				defer conn.Close()
+				conn.Handshake()
+				acceptFD, _ := dut.Accept(listenFD)
+
+				if tt.userTimeout != 0 {
+					dut.SetSockOptInt(acceptFD, unix.SOL_TCP, unix.TCP_USER_TIMEOUT, int32(tt.userTimeout.Milliseconds()))
+				}
+
+				if err := ttf.f(&conn, &dut, acceptFD); err != nil {
+					t.Fatal(err)
+				}
+
+				time.Sleep(tt.sendDelay)
+				conn.Drain()
+				conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagAck)})
+
+				// If TCP_USER_TIMEOUT was set and the above delay was longer than the
+				// TCP_USER_TIMEOUT then the DUT should send a RST in response to the
+				// testbench's packet.
+				expectRST := tt.userTimeout != 0 && tt.sendDelay > tt.userTimeout
+				expectTimeout := 5 * time.Second
+				got, err := conn.Expect(tb.TCP{Flags: tb.Uint8(header.TCPFlagRst)}, expectTimeout)
+				if expectRST && err != nil {
+					t.Errorf("expected RST packet within %s but got none: %s", expectTimeout, err)
+				}
+				if !expectRST && got != nil {
+					t.Errorf("expected no RST packet within %s but got one: %s", expectTimeout, got)
+				}
+			})
+		}
+	}
+}