89 lines
3.3 KiB
Go
89 lines
3.3 KiB
Go
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// 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_synsent_reset_test
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import (
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"flag"
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"net"
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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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tb "gvisor.dev/gvisor/test/packetimpact/testbench"
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)
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func init() {
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tb.RegisterFlags(flag.CommandLine)
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}
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// dutSynSentState sets up the dut connection in SYN-SENT state.
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func dutSynSentState(t *testing.T) (*tb.DUT, *tb.TCPIPv4, uint16, uint16) {
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dut := tb.NewDUT(t)
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clientFD, clientPort := dut.CreateBoundSocket(unix.SOCK_STREAM|unix.SOCK_NONBLOCK, unix.IPPROTO_TCP, net.ParseIP(tb.RemoteIPv4))
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port := uint16(9001)
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conn := tb.NewTCPIPv4(t, tb.TCP{SrcPort: &port, DstPort: &clientPort}, tb.TCP{SrcPort: &clientPort, DstPort: &port})
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sa := unix.SockaddrInet4{Port: int(port)}
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copy(sa.Addr[:], net.IP(net.ParseIP(tb.LocalIPv4)).To4())
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// Bring the dut to SYN-SENT state with a non-blocking connect.
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dut.Connect(clientFD, &sa)
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if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagSyn)}, nil, time.Second); err != nil {
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t.Fatalf("expected SYN\n")
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}
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return &dut, &conn, port, clientPort
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}
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// TestTCPSynSentReset tests RFC793, p67: SYN-SENT to CLOSED transition.
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func TestTCPSynSentReset(t *testing.T) {
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dut, conn, _, _ := dutSynSentState(t)
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defer conn.Close()
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defer dut.TearDown()
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conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagRst | header.TCPFlagAck)})
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// Expect the connection to have closed.
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// TODO(gvisor.dev/issue/478): Check for TCP_INFO on the dut side.
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conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagAck)})
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if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagRst)}, nil, time.Second); err != nil {
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t.Fatalf("expected a TCP RST")
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}
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}
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// TestTCPSynSentRcvdReset tests RFC793, p70, SYN-SENT to SYN-RCVD to CLOSED
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// transitions.
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func TestTCPSynSentRcvdReset(t *testing.T) {
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dut, c, remotePort, clientPort := dutSynSentState(t)
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defer dut.TearDown()
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defer c.Close()
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conn := tb.NewTCPIPv4(t, tb.TCP{SrcPort: &remotePort, DstPort: &clientPort}, tb.TCP{SrcPort: &clientPort, DstPort: &remotePort})
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defer conn.Close()
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// Initiate new SYN connection with the same port pair
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// (simultaneous open case), expect the dut connection to move to
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// SYN-RCVD state
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conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagSyn)})
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if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagSyn | header.TCPFlagAck)}, nil, time.Second); err != nil {
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t.Fatalf("expected SYN-ACK %s\n", err)
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}
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conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagRst)})
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// Expect the connection to have transitioned SYN-RCVD to CLOSED.
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// TODO(gvisor.dev/issue/478): Check for TCP_INFO on the dut side.
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conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagAck)})
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if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagRst)}, nil, time.Second); err != nil {
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t.Fatalf("expected a TCP RST")
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}
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}
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