// Copyright 2012 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // +build !go1.9 package ipv4_test import ( "bytes" "fmt" "net" "runtime" "strings" "sync" "testing" "golang.org/x/net/internal/iana" "golang.org/x/net/internal/nettest" "golang.org/x/net/ipv4" ) func BenchmarkPacketConnReadWriteUnicast(b *testing.B) { switch runtime.GOOS { case "js", "nacl", "plan9", "windows": b.Skipf("not supported on %s", runtime.GOOS) } payload := []byte("HELLO-R-U-THERE") iph, err := (&ipv4.Header{ Version: ipv4.Version, Len: ipv4.HeaderLen, TotalLen: ipv4.HeaderLen + len(payload), TTL: 1, Protocol: iana.ProtocolReserved, Src: net.IPv4(192, 0, 2, 1), Dst: net.IPv4(192, 0, 2, 254), }).Marshal() if err != nil { b.Fatal(err) } greh := []byte{0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00} datagram := append(greh, append(iph, payload...)...) bb := make([]byte, 128) cm := ipv4.ControlMessage{ Src: net.IPv4(127, 0, 0, 1), } if ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback); ifi != nil { cm.IfIndex = ifi.Index } b.Run("UDP", func(b *testing.B) { c, err := nettest.NewLocalPacketListener("udp4") if err != nil { b.Skipf("not supported on %s/%s: %v", runtime.GOOS, runtime.GOARCH, err) } defer c.Close() p := ipv4.NewPacketConn(c) dst := c.LocalAddr() cf := ipv4.FlagTTL | ipv4.FlagInterface if err := p.SetControlMessage(cf, true); err != nil { b.Fatal(err) } b.Run("Net", func(b *testing.B) { for i := 0; i < b.N; i++ { if _, err := c.WriteTo(payload, dst); err != nil { b.Fatal(err) } if _, _, err := c.ReadFrom(bb); err != nil { b.Fatal(err) } } }) b.Run("ToFrom", func(b *testing.B) { for i := 0; i < b.N; i++ { if _, err := p.WriteTo(payload, &cm, dst); err != nil { b.Fatal(err) } if _, _, _, err := p.ReadFrom(bb); err != nil { b.Fatal(err) } } }) }) b.Run("IP", func(b *testing.B) { switch runtime.GOOS { case "netbsd": b.Skip("need to configure gre on netbsd") case "openbsd": b.Skip("net.inet.gre.allow=0 by default on openbsd") } c, err := net.ListenPacket(fmt.Sprintf("ip4:%d", iana.ProtocolGRE), "127.0.0.1") if err != nil { b.Skipf("not supported on %s/%s: %v", runtime.GOOS, runtime.GOARCH, err) } defer c.Close() p := ipv4.NewPacketConn(c) dst := c.LocalAddr() cf := ipv4.FlagTTL | ipv4.FlagInterface if err := p.SetControlMessage(cf, true); err != nil { b.Fatal(err) } b.Run("Net", func(b *testing.B) { for i := 0; i < b.N; i++ { if _, err := c.WriteTo(datagram, dst); err != nil { b.Fatal(err) } if _, _, err := c.ReadFrom(bb); err != nil { b.Fatal(err) } } }) b.Run("ToFrom", func(b *testing.B) { for i := 0; i < b.N; i++ { if _, err := p.WriteTo(datagram, &cm, dst); err != nil { b.Fatal(err) } if _, _, _, err := p.ReadFrom(bb); err != nil { b.Fatal(err) } } }) }) } func TestPacketConnConcurrentReadWriteUnicast(t *testing.T) { switch runtime.GOOS { case "js", "nacl", "plan9", "windows": t.Skipf("not supported on %s", runtime.GOOS) } payload := []byte("HELLO-R-U-THERE") iph, err := (&ipv4.Header{ Version: ipv4.Version, Len: ipv4.HeaderLen, TotalLen: ipv4.HeaderLen + len(payload), TTL: 1, Protocol: iana.ProtocolReserved, Src: net.IPv4(192, 0, 2, 1), Dst: net.IPv4(192, 0, 2, 254), }).Marshal() if err != nil { t.Fatal(err) } greh := []byte{0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00} datagram := append(greh, append(iph, payload...)...) t.Run("UDP", func(t *testing.T) { c, err := nettest.NewLocalPacketListener("udp4") if err != nil { t.Skipf("not supported on %s/%s: %v", runtime.GOOS, runtime.GOARCH, err) } defer c.Close() p := ipv4.NewPacketConn(c) t.Run("ToFrom", func(t *testing.T) { testPacketConnConcurrentReadWriteUnicast(t, p, payload, c.LocalAddr()) }) }) t.Run("IP", func(t *testing.T) { switch runtime.GOOS { case "netbsd": t.Skip("need to configure gre on netbsd") case "openbsd": t.Skip("net.inet.gre.allow=0 by default on openbsd") } c, err := net.ListenPacket(fmt.Sprintf("ip4:%d", iana.ProtocolGRE), "127.0.0.1") if err != nil { t.Skipf("not supported on %s/%s: %v", runtime.GOOS, runtime.GOARCH, err) } defer c.Close() p := ipv4.NewPacketConn(c) t.Run("ToFrom", func(t *testing.T) { testPacketConnConcurrentReadWriteUnicast(t, p, datagram, c.LocalAddr()) }) }) } func testPacketConnConcurrentReadWriteUnicast(t *testing.T, p *ipv4.PacketConn, data []byte, dst net.Addr) { ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback) cf := ipv4.FlagTTL | ipv4.FlagSrc | ipv4.FlagDst | ipv4.FlagInterface if err := p.SetControlMessage(cf, true); err != nil { // probe before test if nettest.ProtocolNotSupported(err) { t.Skipf("not supported on %s", runtime.GOOS) } t.Fatal(err) } var wg sync.WaitGroup reader := func() { defer wg.Done() b := make([]byte, 128) n, cm, _, err := p.ReadFrom(b) if err != nil { t.Error(err) return } if !bytes.Equal(b[:n], data) { t.Errorf("got %#v; want %#v", b[:n], data) return } s := cm.String() if strings.Contains(s, ",") { t.Errorf("should be space-separated values: %s", s) return } } writer := func(toggle bool) { defer wg.Done() cm := ipv4.ControlMessage{ Src: net.IPv4(127, 0, 0, 1), } if ifi != nil { cm.IfIndex = ifi.Index } if err := p.SetControlMessage(cf, toggle); err != nil { t.Error(err) return } n, err := p.WriteTo(data, &cm, dst) if err != nil { t.Error(err) return } if n != len(data) { t.Errorf("got %d; want %d", n, len(data)) return } } const N = 10 wg.Add(N) for i := 0; i < N; i++ { go reader() } wg.Add(2 * N) for i := 0; i < 2*N; i++ { go writer(i%2 != 0) } wg.Add(N) for i := 0; i < N; i++ { go reader() } wg.Wait() }