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-rw-r--r--benchmarks/tcp/tcp_proxy.go436
1 files changed, 436 insertions, 0 deletions
diff --git a/benchmarks/tcp/tcp_proxy.go b/benchmarks/tcp/tcp_proxy.go
new file mode 100644
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+++ b/benchmarks/tcp/tcp_proxy.go
@@ -0,0 +1,436 @@
+// Copyright 2018 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.
+
+// Binary tcp_proxy is a simple TCP proxy.
+package main
+
+import (
+ "encoding/gob"
+ "flag"
+ "fmt"
+ "io"
+ "log"
+ "math/rand"
+ "net"
+ "os"
+ "os/signal"
+ "regexp"
+ "runtime"
+ "runtime/pprof"
+ "strconv"
+ "syscall"
+ "time"
+
+ "golang.org/x/sys/unix"
+ "gvisor.dev/gvisor/pkg/tcpip"
+ "gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
+ "gvisor.dev/gvisor/pkg/tcpip/link/fdbased"
+ "gvisor.dev/gvisor/pkg/tcpip/network/arp"
+ "gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
+ "gvisor.dev/gvisor/pkg/tcpip/stack"
+ "gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+ "gvisor.dev/gvisor/pkg/tcpip/transport/udp"
+)
+
+var (
+ port = flag.Int("port", 0, "bind port (all addresses)")
+ forward = flag.String("forward", "", "forwarding target")
+ client = flag.Bool("client", false, "use netstack for listen")
+ server = flag.Bool("server", false, "use netstack for dial")
+
+ // Netstack-specific options.
+ mtu = flag.Int("mtu", 1280, "mtu for network stack")
+ addr = flag.String("addr", "", "address for tap-based netstack")
+ mask = flag.Int("mask", 8, "mask size for address")
+ iface = flag.String("iface", "", "network interface name to bind for netstack")
+ sack = flag.Bool("sack", false, "enable SACK support for netstack")
+ cubic = flag.Bool("cubic", false, "enable use of CUBIC congestion control for netstack")
+ gso = flag.Int("gso", 0, "GSO maximum size")
+ swgso = flag.Bool("swgso", false, "software-level GSO")
+ clientTCPProbeFile = flag.String("client_tcp_probe_file", "", "if specified, installs a tcp probe to dump endpoint state to the specified file.")
+ serverTCPProbeFile = flag.String("server_tcp_probe_file", "", "if specified, installs a tcp probe to dump endpoint state to the specified file.")
+ cpuprofile = flag.String("cpuprofile", "", "write cpu profile to the specified file.")
+ memprofile = flag.String("memprofile", "", "write memory profile to the specified file.")
+)
+
+type impl interface {
+ dial(address string) (net.Conn, error)
+ listen(port int) (net.Listener, error)
+ printStats()
+}
+
+type netImpl struct{}
+
+func (netImpl) dial(address string) (net.Conn, error) {
+ return net.Dial("tcp", address)
+}
+
+func (netImpl) listen(port int) (net.Listener, error) {
+ return net.Listen("tcp", fmt.Sprintf(":%d", port))
+}
+
+func (netImpl) printStats() {
+}
+
+const (
+ nicID = 1 // Fixed.
+ rcvBufSize = 1 << 20 // 1MB.
+)
+
+type netstackImpl struct {
+ s *stack.Stack
+ addr tcpip.Address
+ mode string
+}
+
+func setupNetwork(ifaceName string) (fd int, err error) {
+ // Get all interfaces in the namespace.
+ ifaces, err := net.Interfaces()
+ if err != nil {
+ return -1, fmt.Errorf("querying interfaces: %v", err)
+ }
+
+ for _, iface := range ifaces {
+ if iface.Name != ifaceName {
+ continue
+ }
+ // Create the socket.
+ const protocol = 0x0300 // htons(ETH_P_ALL)
+ fd, err := syscall.Socket(syscall.AF_PACKET, syscall.SOCK_RAW, protocol)
+ if err != nil {
+ return -1, fmt.Errorf("unable to create raw socket: %v", err)
+ }
+
+ // Bind to the appropriate device.
+ ll := syscall.SockaddrLinklayer{
+ Protocol: protocol,
+ Ifindex: iface.Index,
+ Pkttype: syscall.PACKET_HOST,
+ }
+ if err := syscall.Bind(fd, &ll); err != nil {
+ return -1, fmt.Errorf("unable to bind to %q: %v", iface.Name, err)
+ }
+
+ // RAW Sockets by default have a very small SO_RCVBUF of 256KB,
+ // up it to at least 1MB to reduce packet drops.
+ if err := syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, rcvBufSize); err != nil {
+ return -1, fmt.Errorf("setsockopt(..., SO_RCVBUF, %v,..) = %v", rcvBufSize, err)
+ }
+
+ if !*swgso && *gso != 0 {
+ if err := syscall.SetsockoptInt(fd, syscall.SOL_PACKET, unix.PACKET_VNET_HDR, 1); err != nil {
+ return -1, fmt.Errorf("unable to enable the PACKET_VNET_HDR option: %v", err)
+ }
+ }
+ return fd, nil
+ }
+ return -1, fmt.Errorf("failed to find interface: %v", ifaceName)
+}
+
+func newNetstackImpl(mode string) (impl, error) {
+ fd, err := setupNetwork(*iface)
+ if err != nil {
+ return nil, err
+ }
+
+ // Parse details.
+ parsedAddr := tcpip.Address(net.ParseIP(*addr).To4())
+ parsedDest := tcpip.Address("") // Filled in below.
+ parsedMask := tcpip.AddressMask("") // Filled in below.
+ switch *mask {
+ case 8:
+ parsedDest = tcpip.Address([]byte{parsedAddr[0], 0, 0, 0})
+ parsedMask = tcpip.AddressMask([]byte{0xff, 0, 0, 0})
+ case 16:
+ parsedDest = tcpip.Address([]byte{parsedAddr[0], parsedAddr[1], 0, 0})
+ parsedMask = tcpip.AddressMask([]byte{0xff, 0xff, 0, 0})
+ case 24:
+ parsedDest = tcpip.Address([]byte{parsedAddr[0], parsedAddr[1], parsedAddr[2], 0})
+ parsedMask = tcpip.AddressMask([]byte{0xff, 0xff, 0xff, 0})
+ default:
+ // This is just laziness; we don't expect a different mask.
+ return nil, fmt.Errorf("mask %d not supported", mask)
+ }
+
+ // Create a new network stack.
+ netProtos := []stack.NetworkProtocol{ipv4.NewProtocol(), arp.NewProtocol()}
+ transProtos := []stack.TransportProtocol{tcp.NewProtocol(), udp.NewProtocol()}
+ s := stack.New(stack.Options{
+ NetworkProtocols: netProtos,
+ TransportProtocols: transProtos,
+ })
+
+ // Generate a new mac for the eth device.
+ mac := make(net.HardwareAddr, 6)
+ rand.Read(mac) // Fill with random data.
+ mac[0] &^= 0x1 // Clear multicast bit.
+ mac[0] |= 0x2 // Set local assignment bit (IEEE802).
+ ep, err := fdbased.New(&fdbased.Options{
+ FDs: []int{fd},
+ MTU: uint32(*mtu),
+ EthernetHeader: true,
+ Address: tcpip.LinkAddress(mac),
+ // Enable checksum generation as we need to generate valid
+ // checksums for the veth device to deliver our packets to the
+ // peer. But we do want to disable checksum verification as veth
+ // devices do perform GRO and the linux host kernel may not
+ // regenerate valid checksums after GRO.
+ TXChecksumOffload: false,
+ RXChecksumOffload: true,
+ PacketDispatchMode: fdbased.RecvMMsg,
+ GSOMaxSize: uint32(*gso),
+ SoftwareGSOEnabled: *swgso,
+ })
+ if err != nil {
+ return nil, fmt.Errorf("failed to create FD endpoint: %v", err)
+ }
+ if err := s.CreateNIC(nicID, ep); err != nil {
+ return nil, fmt.Errorf("error creating NIC %q: %v", *iface, err)
+ }
+ if err := s.AddAddress(nicID, arp.ProtocolNumber, arp.ProtocolAddress); err != nil {
+ return nil, fmt.Errorf("error adding ARP address to %q: %v", *iface, err)
+ }
+ if err := s.AddAddress(nicID, ipv4.ProtocolNumber, parsedAddr); err != nil {
+ return nil, fmt.Errorf("error adding IP address to %q: %v", *iface, err)
+ }
+
+ subnet, err := tcpip.NewSubnet(parsedDest, parsedMask)
+ if err != nil {
+ return nil, fmt.Errorf("tcpip.Subnet(%s, %s): %s", parsedDest, parsedMask, err)
+ }
+ // Add default route; we only support
+ s.SetRouteTable([]tcpip.Route{
+ {
+ Destination: subnet,
+ NIC: nicID,
+ },
+ })
+
+ // Set protocol options.
+ if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.SACKEnabled(*sack)); err != nil {
+ return nil, fmt.Errorf("SetTransportProtocolOption for SACKEnabled failed: %v", err)
+ }
+
+ // Set Congestion Control to cubic if requested.
+ if *cubic {
+ if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tcpip.CongestionControlOption("cubic")); err != nil {
+ return nil, fmt.Errorf("SetTransportProtocolOption for CongestionControlOption(cubic) failed: %v", err)
+ }
+ }
+
+ return netstackImpl{
+ s: s,
+ addr: parsedAddr,
+ mode: mode,
+ }, nil
+}
+
+func (n netstackImpl) dial(address string) (net.Conn, error) {
+ host, port, err := net.SplitHostPort(address)
+ if err != nil {
+ return nil, err
+ }
+ if host == "" {
+ // A host must be provided for the dial.
+ return nil, fmt.Errorf("no host provided")
+ }
+ portNumber, err := strconv.Atoi(port)
+ if err != nil {
+ return nil, err
+ }
+ addr := tcpip.FullAddress{
+ NIC: nicID,
+ Addr: tcpip.Address(net.ParseIP(host).To4()),
+ Port: uint16(portNumber),
+ }
+ conn, err := gonet.DialTCP(n.s, addr, ipv4.ProtocolNumber)
+ if err != nil {
+ return nil, err
+ }
+ return conn, nil
+}
+
+func (n netstackImpl) listen(port int) (net.Listener, error) {
+ addr := tcpip.FullAddress{
+ NIC: nicID,
+ Port: uint16(port),
+ }
+ listener, err := gonet.NewListener(n.s, addr, ipv4.ProtocolNumber)
+ if err != nil {
+ return nil, err
+ }
+ return listener, nil
+}
+
+var zeroFieldsRegexp = regexp.MustCompile(`\s*[a-zA-Z0-9]*:0`)
+
+func (n netstackImpl) printStats() {
+ // Don't show zero fields.
+ stats := zeroFieldsRegexp.ReplaceAllString(fmt.Sprintf("%+v", n.s.Stats()), "")
+ log.Printf("netstack %s Stats: %+v\n", n.mode, stats)
+}
+
+// installProbe installs a TCP Probe function that will dump endpoint
+// state to the specified file. It also returns a close func() that
+// can be used to close the probeFile.
+func (n netstackImpl) installProbe(probeFileName string) (close func()) {
+ // Install Probe to dump out end point state.
+ probeFile, err := os.Create(probeFileName)
+ if err != nil {
+ log.Fatalf("failed to create tcp_probe file %s: %v", probeFileName, err)
+ }
+ probeEncoder := gob.NewEncoder(probeFile)
+ // Install a TCP Probe.
+ n.s.AddTCPProbe(func(state stack.TCPEndpointState) {
+ probeEncoder.Encode(state)
+ })
+ return func() { probeFile.Close() }
+}
+
+func main() {
+ flag.Parse()
+ if *port == 0 {
+ log.Fatalf("no port provided")
+ }
+ if *forward == "" {
+ log.Fatalf("no forward provided")
+ }
+ // Seed the random number generator to ensure that we are given MAC addresses that don't
+ // for the case of the client and server stack.
+ rand.Seed(time.Now().UTC().UnixNano())
+
+ if *cpuprofile != "" {
+ f, err := os.Create(*cpuprofile)
+ if err != nil {
+ log.Fatal("could not create CPU profile: ", err)
+ }
+ defer func() {
+ if err := f.Close(); err != nil {
+ log.Print("error closing CPU profile: ", err)
+ }
+ }()
+ if err := pprof.StartCPUProfile(f); err != nil {
+ log.Fatal("could not start CPU profile: ", err)
+ }
+ defer pprof.StopCPUProfile()
+ }
+
+ var (
+ in impl
+ out impl
+ err error
+ )
+ if *server {
+ in, err = newNetstackImpl("server")
+ if *serverTCPProbeFile != "" {
+ defer in.(netstackImpl).installProbe(*serverTCPProbeFile)()
+ }
+
+ } else {
+ in = netImpl{}
+ }
+ if err != nil {
+ log.Fatalf("netstack error: %v", err)
+ }
+ if *client {
+ out, err = newNetstackImpl("client")
+ if *clientTCPProbeFile != "" {
+ defer out.(netstackImpl).installProbe(*clientTCPProbeFile)()
+ }
+ } else {
+ out = netImpl{}
+ }
+ if err != nil {
+ log.Fatalf("netstack error: %v", err)
+ }
+
+ // Dial forward before binding.
+ var next net.Conn
+ for {
+ next, err = out.dial(*forward)
+ if err == nil {
+ break
+ }
+ time.Sleep(50 * time.Millisecond)
+ log.Printf("connect failed retrying: %v", err)
+ }
+
+ // Bind once to the server socket.
+ listener, err := in.listen(*port)
+ if err != nil {
+ // Should not happen, everything must be bound by this time
+ // this proxy is started.
+ log.Fatalf("unable to listen: %v", err)
+ }
+ log.Printf("client=%v, server=%v, ready.", *client, *server)
+
+ sigs := make(chan os.Signal, 1)
+ signal.Notify(sigs, syscall.SIGTERM)
+ go func() {
+ <-sigs
+ if *cpuprofile != "" {
+ pprof.StopCPUProfile()
+ }
+ if *memprofile != "" {
+ f, err := os.Create(*memprofile)
+ if err != nil {
+ log.Fatal("could not create memory profile: ", err)
+ }
+ defer func() {
+ if err := f.Close(); err != nil {
+ log.Print("error closing memory profile: ", err)
+ }
+ }()
+ runtime.GC() // get up-to-date statistics
+ if err := pprof.WriteHeapProfile(f); err != nil {
+ log.Fatalf("Unable to write heap profile: %v", err)
+ }
+ }
+ os.Exit(0)
+ }()
+
+ for {
+ // Forward all connections.
+ inConn, err := listener.Accept()
+ if err != nil {
+ // This should not happen; we are listening
+ // successfully. Exhausted all available FDs?
+ log.Fatalf("accept error: %v", err)
+ }
+ log.Printf("incoming connection established.")
+
+ // Copy both ways.
+ go io.Copy(inConn, next)
+ go io.Copy(next, inConn)
+
+ // Print stats every second.
+ go func() {
+ t := time.NewTicker(time.Second)
+ defer t.Stop()
+ for {
+ <-t.C
+ in.printStats()
+ out.printStats()
+ }
+ }()
+
+ for {
+ // Dial again.
+ next, err = out.dial(*forward)
+ if err == nil {
+ break
+ }
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 10:54:33 +0000