mirror of
https://github.com/tailscale/tailscale.git
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df6014f1d7
In2f27319bafwe disabled GRO due to a data race around concurrent calls to tstun.Wrapper.Write(). This commit refactors GRO to be thread-safe, and re-enables it on Linux. This refactor now carries a GRO type across tstun and netstack APIs with a lifetime that is scoped to a single tstun.Wrapper.Write() call. In25f0a3fc8fwe used build tags to prevent importation of gVisor's GRO package on iOS as at the time we believed it was contributing to additional memory usage on that platform. It wasn't, so this commit simplifies and removes those build tags. Updates tailscale/corp#22353 Updates tailscale/corp#22125 Updates #6816 Signed-off-by: Jordan Whited <jordan@tailscale.com>
1015 lines
29 KiB
Go
1015 lines
29 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package netstack
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import (
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"context"
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"fmt"
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"maps"
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"net"
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"net/netip"
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"runtime"
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"testing"
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"time"
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"gvisor.dev/gvisor/pkg/buffer"
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"gvisor.dev/gvisor/pkg/tcpip"
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"gvisor.dev/gvisor/pkg/tcpip/header"
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"gvisor.dev/gvisor/pkg/tcpip/stack"
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"tailscale.com/envknob"
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"tailscale.com/ipn"
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"tailscale.com/ipn/ipnlocal"
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"tailscale.com/ipn/store/mem"
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"tailscale.com/metrics"
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"tailscale.com/net/packet"
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"tailscale.com/net/tsaddr"
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"tailscale.com/net/tsdial"
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"tailscale.com/net/tstun"
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"tailscale.com/tsd"
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"tailscale.com/tstest"
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"tailscale.com/types/ipproto"
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"tailscale.com/types/logid"
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"tailscale.com/wgengine"
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"tailscale.com/wgengine/filter"
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)
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// TestInjectInboundLeak tests that injectInbound doesn't leak memory.
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// See https://github.com/tailscale/tailscale/issues/3762
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func TestInjectInboundLeak(t *testing.T) {
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tunDev := tstun.NewFake()
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dialer := new(tsdial.Dialer)
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logf := func(format string, args ...any) {
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if !t.Failed() {
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t.Logf(format, args...)
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}
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}
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sys := new(tsd.System)
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eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
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Tun: tunDev,
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Dialer: dialer,
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SetSubsystem: sys.Set,
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HealthTracker: sys.HealthTracker(),
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})
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if err != nil {
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t.Fatal(err)
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}
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defer eng.Close()
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sys.Set(eng)
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sys.Set(new(mem.Store))
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tunWrap := sys.Tun.Get()
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lb, err := ipnlocal.NewLocalBackend(logf, logid.PublicID{}, sys, 0)
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if err != nil {
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t.Fatal(err)
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}
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ns, err := Create(logf, tunWrap, eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper(), nil)
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if err != nil {
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t.Fatal(err)
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}
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defer ns.Close()
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ns.ProcessLocalIPs = true
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if err := ns.Start(lb); err != nil {
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t.Fatalf("Start: %v", err)
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}
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ns.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return true })
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pkt := &packet.Parsed{}
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const N = 10_000
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ms0 := getMemStats()
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for range N {
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outcome, _ := ns.injectInbound(pkt, tunWrap, nil)
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if outcome != filter.DropSilently {
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t.Fatalf("got outcome %v; want DropSilently", outcome)
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}
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}
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ms1 := getMemStats()
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if grew := int64(ms1.HeapObjects) - int64(ms0.HeapObjects); grew >= N {
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t.Fatalf("grew by %v (which is too much and >= the %v packets we sent)", grew, N)
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}
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}
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func getMemStats() (ms runtime.MemStats) {
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runtime.GC()
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runtime.ReadMemStats(&ms)
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return
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}
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func makeNetstack(tb testing.TB, config func(*Impl)) *Impl {
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tunDev := tstun.NewFake()
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sys := &tsd.System{}
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sys.Set(new(mem.Store))
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dialer := new(tsdial.Dialer)
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logf := tstest.WhileTestRunningLogger(tb)
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eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
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Tun: tunDev,
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Dialer: dialer,
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SetSubsystem: sys.Set,
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HealthTracker: sys.HealthTracker(),
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})
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if err != nil {
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tb.Fatal(err)
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}
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tb.Cleanup(func() { eng.Close() })
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sys.Set(eng)
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ns, err := Create(logf, sys.Tun.Get(), eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper(), nil)
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if err != nil {
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tb.Fatal(err)
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}
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tb.Cleanup(func() { ns.Close() })
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lb, err := ipnlocal.NewLocalBackend(logf, logid.PublicID{}, sys, 0)
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if err != nil {
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tb.Fatalf("NewLocalBackend: %v", err)
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}
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ns.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return true })
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if config != nil {
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config(ns)
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}
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if err := ns.Start(lb); err != nil {
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tb.Fatalf("Start: %v", err)
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}
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return ns
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}
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func TestShouldHandlePing(t *testing.T) {
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srcIP := netip.AddrFrom4([4]byte{1, 2, 3, 4})
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t.Run("ICMP4", func(t *testing.T) {
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dst := netip.MustParseAddr("5.6.7.8")
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icmph := packet.ICMP4Header{
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IP4Header: packet.IP4Header{
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IPProto: ipproto.ICMPv4,
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Src: srcIP,
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Dst: dst,
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},
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Type: packet.ICMP4EchoRequest,
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Code: packet.ICMP4NoCode,
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}
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_, payload := packet.ICMPEchoPayload(nil)
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icmpPing := packet.Generate(icmph, payload)
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pkt := &packet.Parsed{}
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pkt.Decode(icmpPing)
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impl := makeNetstack(t, func(impl *Impl) {
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impl.ProcessSubnets = true
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})
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pingDst, ok := impl.shouldHandlePing(pkt)
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if !ok {
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t.Errorf("expected shouldHandlePing==true")
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}
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if pingDst != dst {
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t.Errorf("got dst %s; want %s", pingDst, dst)
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}
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})
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t.Run("ICMP6-no-via", func(t *testing.T) {
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dst := netip.MustParseAddr("2a09:8280:1::4169")
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icmph := packet.ICMP6Header{
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IP6Header: packet.IP6Header{
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IPProto: ipproto.ICMPv6,
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Src: srcIP,
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Dst: dst,
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},
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Type: packet.ICMP6EchoRequest,
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Code: packet.ICMP6NoCode,
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}
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_, payload := packet.ICMPEchoPayload(nil)
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icmpPing := packet.Generate(icmph, payload)
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pkt := &packet.Parsed{}
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pkt.Decode(icmpPing)
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impl := makeNetstack(t, func(impl *Impl) {
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impl.ProcessSubnets = true
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})
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pingDst, ok := impl.shouldHandlePing(pkt)
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// Expect that we handle this since it's going out onto the
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// network.
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if !ok {
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t.Errorf("expected shouldHandlePing==true")
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}
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if pingDst != dst {
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t.Errorf("got dst %s; want %s", pingDst, dst)
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}
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})
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t.Run("ICMP6-tailscale-addr", func(t *testing.T) {
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dst := netip.MustParseAddr("fd7a:115c:a1e0:ab12::1")
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icmph := packet.ICMP6Header{
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IP6Header: packet.IP6Header{
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IPProto: ipproto.ICMPv6,
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Src: srcIP,
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Dst: dst,
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},
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Type: packet.ICMP6EchoRequest,
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Code: packet.ICMP6NoCode,
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}
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_, payload := packet.ICMPEchoPayload(nil)
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icmpPing := packet.Generate(icmph, payload)
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pkt := &packet.Parsed{}
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pkt.Decode(icmpPing)
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impl := makeNetstack(t, func(impl *Impl) {
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impl.ProcessSubnets = true
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})
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_, ok := impl.shouldHandlePing(pkt)
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// We don't handle this because it's a Tailscale IP and not 4via6
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if ok {
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t.Errorf("expected shouldHandlePing==false")
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}
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})
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// Handle pings for 4via6 addresses regardless of ProcessSubnets
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for _, subnets := range []bool{true, false} {
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t.Run("ICMP6-4via6-ProcessSubnets-"+fmt.Sprint(subnets), func(t *testing.T) {
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// The 4via6 route 10.1.1.0/24 siteid 7, and then the IP
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// 10.1.1.9 within that route.
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dst := netip.MustParseAddr("fd7a:115c:a1e0:b1a:0:7:a01:109")
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expectedPingDst := netip.MustParseAddr("10.1.1.9")
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icmph := packet.ICMP6Header{
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IP6Header: packet.IP6Header{
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IPProto: ipproto.ICMPv6,
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Src: srcIP,
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Dst: dst,
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},
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Type: packet.ICMP6EchoRequest,
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Code: packet.ICMP6NoCode,
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}
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_, payload := packet.ICMPEchoPayload(nil)
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icmpPing := packet.Generate(icmph, payload)
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pkt := &packet.Parsed{}
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pkt.Decode(icmpPing)
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impl := makeNetstack(t, func(impl *Impl) {
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impl.ProcessSubnets = subnets
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})
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pingDst, ok := impl.shouldHandlePing(pkt)
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// Handled due to being 4via6
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if !ok {
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t.Errorf("expected shouldHandlePing==true")
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} else if pingDst != expectedPingDst {
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t.Errorf("got dst %s; want %s", pingDst, expectedPingDst)
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}
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})
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}
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}
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// looksLikeATailscaleSelfAddress reports whether addr looks like
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// a Tailscale self address, for tests.
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func looksLikeATailscaleSelfAddress(addr netip.Addr) bool {
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return addr.Is4() && tsaddr.IsTailscaleIP(addr) ||
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addr.Is6() && tsaddr.Tailscale4To6Range().Contains(addr)
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}
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func TestShouldProcessInbound(t *testing.T) {
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testCases := []struct {
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name string
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pkt *packet.Parsed
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afterStart func(*Impl) // optional; after Impl.Start is called
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beforeStart func(*Impl) // optional; before Impl.Start is called
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want bool
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runOnGOOS string
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}{
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{
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name: "ipv6-via",
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pkt: &packet.Parsed{
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IPVersion: 6,
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IPProto: ipproto.TCP,
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Src: netip.MustParseAddrPort("100.101.102.103:1234"),
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// $ tailscale debug via 7 10.1.1.9/24
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// fd7a:115c:a1e0:b1a:0:7:a01:109/120
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Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:109]:5678"),
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TCPFlags: packet.TCPSyn,
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},
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afterStart: func(i *Impl) {
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prefs := ipn.NewPrefs()
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prefs.AdvertiseRoutes = []netip.Prefix{
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// $ tailscale debug via 7 10.1.1.0/24
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// fd7a:115c:a1e0:b1a:0:7:a01:100/120
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netip.MustParsePrefix("fd7a:115c:a1e0:b1a:0:7:a01:100/120"),
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}
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i.lb.Start(ipn.Options{
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UpdatePrefs: prefs,
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})
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i.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
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},
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beforeStart: func(i *Impl) {
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// This should be handled even if we're
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// otherwise not processing local IPs or
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// subnets.
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i.ProcessLocalIPs = false
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i.ProcessSubnets = false
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},
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want: true,
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},
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{
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name: "ipv6-via-not-advertised",
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pkt: &packet.Parsed{
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IPVersion: 6,
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IPProto: ipproto.TCP,
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Src: netip.MustParseAddrPort("100.101.102.103:1234"),
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// $ tailscale debug via 7 10.1.1.9/24
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// fd7a:115c:a1e0:b1a:0:7:a01:109/120
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Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:109]:5678"),
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TCPFlags: packet.TCPSyn,
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},
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afterStart: func(i *Impl) {
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prefs := ipn.NewPrefs()
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prefs.AdvertiseRoutes = []netip.Prefix{
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// tailscale debug via 7 10.1.2.0/24
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// fd7a:115c:a1e0:b1a:0:7:a01:200/120
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netip.MustParsePrefix("fd7a:115c:a1e0:b1a:0:7:a01:200/120"),
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}
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i.lb.Start(ipn.Options{
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UpdatePrefs: prefs,
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})
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},
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want: false,
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},
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{
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name: "tailscale-ssh-enabled",
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pkt: &packet.Parsed{
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IPVersion: 4,
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IPProto: ipproto.TCP,
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Src: netip.MustParseAddrPort("100.101.102.103:1234"),
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Dst: netip.MustParseAddrPort("100.101.102.104:22"),
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TCPFlags: packet.TCPSyn,
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},
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afterStart: func(i *Impl) {
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prefs := ipn.NewPrefs()
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prefs.RunSSH = true
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i.lb.Start(ipn.Options{
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UpdatePrefs: prefs,
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})
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i.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
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return addr.String() == "100.101.102.104" // Dst, above
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})
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},
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want: true,
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runOnGOOS: "linux",
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},
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{
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name: "tailscale-ssh-disabled",
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pkt: &packet.Parsed{
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IPVersion: 4,
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IPProto: ipproto.TCP,
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Src: netip.MustParseAddrPort("100.101.102.103:1234"),
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Dst: netip.MustParseAddrPort("100.101.102.104:22"),
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TCPFlags: packet.TCPSyn,
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},
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afterStart: func(i *Impl) {
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prefs := ipn.NewPrefs()
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prefs.RunSSH = false // default, but to be explicit
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i.lb.Start(ipn.Options{
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UpdatePrefs: prefs,
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})
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i.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
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return addr.String() == "100.101.102.104" // Dst, above
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})
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},
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want: false,
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},
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{
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name: "process-local-ips",
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pkt: &packet.Parsed{
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IPVersion: 4,
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IPProto: ipproto.TCP,
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Src: netip.MustParseAddrPort("100.101.102.103:1234"),
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Dst: netip.MustParseAddrPort("100.101.102.104:4567"),
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TCPFlags: packet.TCPSyn,
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},
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afterStart: func(i *Impl) {
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i.ProcessLocalIPs = true
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i.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
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return addr.String() == "100.101.102.104" // Dst, above
|
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})
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},
|
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want: true,
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},
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||
{
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name: "process-subnets",
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pkt: &packet.Parsed{
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IPVersion: 4,
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IPProto: ipproto.TCP,
|
||
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
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||
Dst: netip.MustParseAddrPort("10.1.2.3:4567"),
|
||
TCPFlags: packet.TCPSyn,
|
||
},
|
||
beforeStart: func(i *Impl) {
|
||
i.ProcessSubnets = true
|
||
},
|
||
afterStart: func(i *Impl) {
|
||
// For testing purposes, assume all Tailscale
|
||
// IPs are local; the Dst above is something
|
||
// not in that range.
|
||
i.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
|
||
},
|
||
want: true,
|
||
},
|
||
{
|
||
name: "peerapi-port-subnet-router", // see #6235
|
||
pkt: &packet.Parsed{
|
||
IPVersion: 4,
|
||
IPProto: ipproto.TCP,
|
||
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
|
||
Dst: netip.MustParseAddrPort("10.0.0.23:5555"),
|
||
TCPFlags: packet.TCPSyn,
|
||
},
|
||
beforeStart: func(i *Impl) {
|
||
// As if we were running on Linux where netstack isn't used.
|
||
i.ProcessSubnets = false
|
||
i.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return false })
|
||
},
|
||
afterStart: func(i *Impl) {
|
||
prefs := ipn.NewPrefs()
|
||
prefs.AdvertiseRoutes = []netip.Prefix{
|
||
netip.MustParsePrefix("10.0.0.1/24"),
|
||
}
|
||
i.lb.Start(ipn.Options{
|
||
UpdatePrefs: prefs,
|
||
})
|
||
|
||
// Set the PeerAPI port to the Dst port above.
|
||
i.peerapiPort4Atomic.Store(5555)
|
||
i.peerapiPort6Atomic.Store(5555)
|
||
},
|
||
want: false,
|
||
},
|
||
|
||
// TODO(andrew): test PeerAPI
|
||
// TODO(andrew): test TCP packets without the SYN flag set
|
||
}
|
||
|
||
for _, tc := range testCases {
|
||
t.Run(tc.name, func(t *testing.T) {
|
||
if tc.runOnGOOS != "" && runtime.GOOS != tc.runOnGOOS {
|
||
t.Skipf("skipping on GOOS=%v", runtime.GOOS)
|
||
}
|
||
impl := makeNetstack(t, tc.beforeStart)
|
||
if tc.afterStart != nil {
|
||
tc.afterStart(impl)
|
||
}
|
||
|
||
got := impl.shouldProcessInbound(tc.pkt, nil)
|
||
if got != tc.want {
|
||
t.Errorf("got shouldProcessInbound()=%v; want %v", got, tc.want)
|
||
} else {
|
||
t.Logf("OK: shouldProcessInbound() = %v", got)
|
||
}
|
||
})
|
||
}
|
||
}
|
||
|
||
func tcp4syn(tb testing.TB, src, dst netip.Addr, sport, dport uint16) []byte {
|
||
ip := header.IPv4(make([]byte, header.IPv4MinimumSize+header.TCPMinimumSize))
|
||
ip.Encode(&header.IPv4Fields{
|
||
Protocol: uint8(header.TCPProtocolNumber),
|
||
TotalLength: header.IPv4MinimumSize + header.TCPMinimumSize,
|
||
TTL: 64,
|
||
SrcAddr: tcpip.AddrFrom4Slice(src.AsSlice()),
|
||
DstAddr: tcpip.AddrFrom4Slice(dst.AsSlice()),
|
||
})
|
||
ip.SetChecksum(^ip.CalculateChecksum())
|
||
if !ip.IsChecksumValid() {
|
||
tb.Fatal("test broken; packet has incorrect IP checksum")
|
||
}
|
||
|
||
tcp := header.TCP(ip[header.IPv4MinimumSize:])
|
||
tcp.Encode(&header.TCPFields{
|
||
SrcPort: sport,
|
||
DstPort: dport,
|
||
SeqNum: 0,
|
||
DataOffset: header.TCPMinimumSize,
|
||
Flags: header.TCPFlagSyn,
|
||
WindowSize: 65535,
|
||
Checksum: 0,
|
||
})
|
||
xsum := header.PseudoHeaderChecksum(
|
||
header.TCPProtocolNumber,
|
||
tcpip.AddrFrom4Slice(src.AsSlice()),
|
||
tcpip.AddrFrom4Slice(dst.AsSlice()),
|
||
uint16(header.TCPMinimumSize),
|
||
)
|
||
tcp.SetChecksum(^tcp.CalculateChecksum(xsum))
|
||
if !tcp.IsChecksumValid(tcpip.AddrFrom4Slice(src.AsSlice()), tcpip.AddrFrom4Slice(dst.AsSlice()), 0, 0) {
|
||
tb.Fatal("test broken; packet has incorrect TCP checksum")
|
||
}
|
||
|
||
return ip
|
||
}
|
||
|
||
// makeHangDialer returns a dialer that notifies the returned channel when a
|
||
// connection is dialed and then hangs until the test finishes.
|
||
func makeHangDialer(tb testing.TB) (func(context.Context, string, string) (net.Conn, error), chan struct{}) {
|
||
done := make(chan struct{})
|
||
tb.Cleanup(func() {
|
||
close(done)
|
||
})
|
||
|
||
gotConn := make(chan struct{}, 1)
|
||
fn := func(ctx context.Context, network, address string) (net.Conn, error) {
|
||
// Signal that we have a new connection
|
||
tb.Logf("hangDialer: called with network=%q address=%q", network, address)
|
||
select {
|
||
case gotConn <- struct{}{}:
|
||
default:
|
||
}
|
||
|
||
// Hang until the test is done.
|
||
select {
|
||
case <-ctx.Done():
|
||
tb.Logf("context done")
|
||
case <-done:
|
||
tb.Logf("function completed")
|
||
}
|
||
return nil, fmt.Errorf("canceled")
|
||
}
|
||
return fn, gotConn
|
||
}
|
||
|
||
// TestTCPForwardLimits verifies that the limits on the TCP forwarder work in a
|
||
// success case (i.e. when we don't hit the limit).
|
||
func TestTCPForwardLimits(t *testing.T) {
|
||
envknob.Setenv("TS_DEBUG_NETSTACK", "true")
|
||
impl := makeNetstack(t, func(impl *Impl) {
|
||
impl.ProcessSubnets = true
|
||
})
|
||
|
||
dialFn, gotConn := makeHangDialer(t)
|
||
impl.forwardDialFunc = dialFn
|
||
|
||
prefs := ipn.NewPrefs()
|
||
prefs.AdvertiseRoutes = []netip.Prefix{
|
||
// This is the TEST-NET-1 IP block for use in documentation,
|
||
// and should never actually be routable.
|
||
netip.MustParsePrefix("192.0.2.0/24"),
|
||
}
|
||
impl.lb.Start(ipn.Options{
|
||
UpdatePrefs: prefs,
|
||
})
|
||
impl.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
|
||
|
||
// Inject an "outbound" packet that's going to an IP address that times
|
||
// out. We need to re-parse from a byte slice so that the internal
|
||
// buffer in the packet.Parsed type is filled out.
|
||
client := netip.MustParseAddr("100.101.102.103")
|
||
destAddr := netip.MustParseAddr("192.0.2.1")
|
||
pkt := tcp4syn(t, client, destAddr, 1234, 4567)
|
||
var parsed packet.Parsed
|
||
parsed.Decode(pkt)
|
||
|
||
// When injecting this packet, we want the outcome to be "drop
|
||
// silently", which indicates that netstack is processing the
|
||
// packet and not delivering it to the host system.
|
||
if resp, _ := impl.injectInbound(&parsed, impl.tundev, nil); resp != filter.DropSilently {
|
||
t.Errorf("got filter outcome %v, want filter.DropSilently", resp)
|
||
}
|
||
|
||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||
defer cancel()
|
||
|
||
// Wait until we have an in-flight outgoing connection.
|
||
select {
|
||
case <-ctx.Done():
|
||
t.Fatalf("timed out waiting for connection")
|
||
case <-gotConn:
|
||
t.Logf("got connection in progress")
|
||
}
|
||
|
||
// Inject another packet, which will be deduplicated and thus not
|
||
// increment our counter.
|
||
parsed.Decode(pkt)
|
||
if resp, _ := impl.injectInbound(&parsed, impl.tundev, nil); resp != filter.DropSilently {
|
||
t.Errorf("got filter outcome %v, want filter.DropSilently", resp)
|
||
}
|
||
|
||
// Verify that we now have a single in-flight address in our map.
|
||
impl.mu.Lock()
|
||
inFlight := maps.Clone(impl.connsInFlightByClient)
|
||
impl.mu.Unlock()
|
||
|
||
if got, ok := inFlight[client]; !ok || got != 1 {
|
||
t.Errorf("expected 1 in-flight connection for %v, got: %v", client, inFlight)
|
||
}
|
||
|
||
// Get the expvar statistics and verify that we're exporting the
|
||
// correct metric.
|
||
metrics := impl.ExpVar().(*metrics.Set)
|
||
|
||
const metricName = "gauge_tcp_forward_in_flight"
|
||
if v := metrics.Get(metricName).String(); v != "1" {
|
||
t.Errorf("got metric %q=%s, want 1", metricName, v)
|
||
}
|
||
}
|
||
|
||
// TestTCPForwardLimits_PerClient verifies that the per-client limit for TCP
|
||
// forwarding works.
|
||
func TestTCPForwardLimits_PerClient(t *testing.T) {
|
||
envknob.Setenv("TS_DEBUG_NETSTACK", "true")
|
||
|
||
// Set our test override limits during this test.
|
||
tstest.Replace(t, &maxInFlightConnectionAttemptsForTest, 2)
|
||
tstest.Replace(t, &maxInFlightConnectionAttemptsPerClientForTest, 1)
|
||
|
||
impl := makeNetstack(t, func(impl *Impl) {
|
||
impl.ProcessSubnets = true
|
||
})
|
||
|
||
dialFn, gotConn := makeHangDialer(t)
|
||
impl.forwardDialFunc = dialFn
|
||
|
||
prefs := ipn.NewPrefs()
|
||
prefs.AdvertiseRoutes = []netip.Prefix{
|
||
// This is the TEST-NET-1 IP block for use in documentation,
|
||
// and should never actually be routable.
|
||
netip.MustParsePrefix("192.0.2.0/24"),
|
||
}
|
||
impl.lb.Start(ipn.Options{
|
||
UpdatePrefs: prefs,
|
||
})
|
||
impl.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
|
||
|
||
// Inject an "outbound" packet that's going to an IP address that times
|
||
// out. We need to re-parse from a byte slice so that the internal
|
||
// buffer in the packet.Parsed type is filled out.
|
||
client := netip.MustParseAddr("100.101.102.103")
|
||
destAddr := netip.MustParseAddr("192.0.2.1")
|
||
|
||
// Helpers
|
||
var port uint16 = 1234
|
||
mustInjectPacket := func() {
|
||
pkt := tcp4syn(t, client, destAddr, port, 4567)
|
||
port++ // to avoid deduplication based on endpoint
|
||
|
||
var parsed packet.Parsed
|
||
parsed.Decode(pkt)
|
||
|
||
// When injecting this packet, we want the outcome to be "drop
|
||
// silently", which indicates that netstack is processing the
|
||
// packet and not delivering it to the host system.
|
||
if resp, _ := impl.injectInbound(&parsed, impl.tundev, nil); resp != filter.DropSilently {
|
||
t.Fatalf("got filter outcome %v, want filter.DropSilently", resp)
|
||
}
|
||
}
|
||
|
||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||
defer cancel()
|
||
|
||
waitPacket := func() {
|
||
select {
|
||
case <-ctx.Done():
|
||
t.Fatalf("timed out waiting for connection")
|
||
case <-gotConn:
|
||
t.Logf("got connection in progress")
|
||
}
|
||
}
|
||
|
||
// Inject the packet to start the TCP forward and wait until we have an
|
||
// in-flight outgoing connection.
|
||
mustInjectPacket()
|
||
waitPacket()
|
||
|
||
// Verify that we now have a single in-flight address in our map.
|
||
impl.mu.Lock()
|
||
inFlight := maps.Clone(impl.connsInFlightByClient)
|
||
impl.mu.Unlock()
|
||
|
||
if got, ok := inFlight[client]; !ok || got != 1 {
|
||
t.Errorf("expected 1 in-flight connection for %v, got: %v", client, inFlight)
|
||
}
|
||
|
||
metrics := impl.ExpVar().(*metrics.Set)
|
||
|
||
// One client should have reached the limit at this point.
|
||
if v := metrics.Get("gauge_tcp_forward_in_flight_per_client_limit_reached").String(); v != "1" {
|
||
t.Errorf("got limit reached expvar metric=%s, want 1", v)
|
||
}
|
||
|
||
// Inject another packet, and verify that we've incremented our
|
||
// "dropped" metrics since this will have been dropped.
|
||
mustInjectPacket()
|
||
|
||
// expvar metric
|
||
const metricName = "counter_tcp_forward_max_in_flight_per_client_drop"
|
||
if v := metrics.Get(metricName).String(); v != "1" {
|
||
t.Errorf("got expvar metric %q=%s, want 1", metricName, v)
|
||
}
|
||
|
||
// client metric
|
||
if v := metricPerClientForwardLimit.Value(); v != 1 {
|
||
t.Errorf("got clientmetric limit metric=%d, want 1", v)
|
||
}
|
||
}
|
||
|
||
// TestHandleLocalPackets tests the handleLocalPackets function, ensuring that
|
||
// we are properly deciding to handle packets that are destined for "local"
|
||
// IPs–addresses that are either for this node, or that it is responsible for.
|
||
//
|
||
// See, e.g. #11304
|
||
func TestHandleLocalPackets(t *testing.T) {
|
||
var (
|
||
selfIP4 = netip.MustParseAddr("100.64.1.2")
|
||
selfIP6 = netip.MustParseAddr("fd7a:115c:a1e0::123")
|
||
)
|
||
|
||
impl := makeNetstack(t, func(impl *Impl) {
|
||
impl.ProcessSubnets = false
|
||
impl.ProcessLocalIPs = false
|
||
impl.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
|
||
return addr == selfIP4 || addr == selfIP6
|
||
})
|
||
})
|
||
|
||
prefs := ipn.NewPrefs()
|
||
prefs.AdvertiseRoutes = []netip.Prefix{
|
||
// $ tailscale debug via 7 10.1.1.0/24
|
||
// fd7a:115c:a1e0:b1a:0:7:a01:100/120
|
||
netip.MustParsePrefix("fd7a:115c:a1e0:b1a:0:7:a01:100/120"),
|
||
}
|
||
_, err := impl.lb.EditPrefs(&ipn.MaskedPrefs{
|
||
Prefs: *prefs,
|
||
AdvertiseRoutesSet: true,
|
||
})
|
||
if err != nil {
|
||
t.Fatalf("EditPrefs: %v", err)
|
||
}
|
||
|
||
t.Run("ShouldHandleServiceIP", func(t *testing.T) {
|
||
pkt := &packet.Parsed{
|
||
IPVersion: 4,
|
||
IPProto: ipproto.TCP,
|
||
Src: netip.MustParseAddrPort("127.0.0.1:9999"),
|
||
Dst: netip.MustParseAddrPort("100.100.100.100:53"),
|
||
TCPFlags: packet.TCPSyn,
|
||
}
|
||
resp := impl.handleLocalPackets(pkt, impl.tundev)
|
||
if resp != filter.DropSilently {
|
||
t.Errorf("got filter outcome %v, want filter.DropSilently", resp)
|
||
}
|
||
})
|
||
t.Run("ShouldHandle4via6", func(t *testing.T) {
|
||
pkt := &packet.Parsed{
|
||
IPVersion: 6,
|
||
IPProto: ipproto.TCP,
|
||
Src: netip.MustParseAddrPort("[::1]:1234"),
|
||
|
||
// This is an IP in the above 4via6 subnet that this node handles.
|
||
// $ tailscale debug via 7 10.1.1.9/24
|
||
// fd7a:115c:a1e0:b1a:0:7:a01:109/120
|
||
Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:109]:5678"),
|
||
TCPFlags: packet.TCPSyn,
|
||
}
|
||
resp := impl.handleLocalPackets(pkt, impl.tundev)
|
||
|
||
// DropSilently is the outcome we expected, since we actually
|
||
// handled this packet by injecting it into netstack, which
|
||
// will handle creating the TCP forwarder. We drop it so we
|
||
// don't process the packet outside of netstack.
|
||
if resp != filter.DropSilently {
|
||
t.Errorf("got filter outcome %v, want filter.DropSilently", resp)
|
||
}
|
||
})
|
||
t.Run("OtherNonHandled", func(t *testing.T) {
|
||
pkt := &packet.Parsed{
|
||
IPVersion: 6,
|
||
IPProto: ipproto.TCP,
|
||
Src: netip.MustParseAddrPort("[::1]:1234"),
|
||
|
||
// This IP is *not* in the above 4via6 route
|
||
// $ tailscale debug via 99 10.1.1.9/24
|
||
// fd7a:115c:a1e0:b1a:0:63:a01:109/120
|
||
Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:63:a01:109]:5678"),
|
||
TCPFlags: packet.TCPSyn,
|
||
}
|
||
resp := impl.handleLocalPackets(pkt, impl.tundev)
|
||
|
||
// Accept means that handleLocalPackets does not handle this
|
||
// packet, we "accept" it to continue further processing,
|
||
// instead of dropping because it was already handled.
|
||
if resp != filter.Accept {
|
||
t.Errorf("got filter outcome %v, want filter.Accept", resp)
|
||
}
|
||
})
|
||
}
|
||
|
||
func TestShouldSendToHost(t *testing.T) {
|
||
var (
|
||
selfIP4 = netip.MustParseAddr("100.64.1.2")
|
||
selfIP6 = netip.MustParseAddr("fd7a:115c:a1e0::123")
|
||
)
|
||
|
||
makeTestNetstack := func(tb testing.TB) *Impl {
|
||
impl := makeNetstack(tb, func(impl *Impl) {
|
||
impl.ProcessSubnets = false
|
||
impl.ProcessLocalIPs = false
|
||
impl.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
|
||
return addr == selfIP4 || addr == selfIP6
|
||
})
|
||
})
|
||
|
||
prefs := ipn.NewPrefs()
|
||
prefs.AdvertiseRoutes = []netip.Prefix{
|
||
// $ tailscale debug via 7 10.1.1.0/24
|
||
// fd7a:115c:a1e0:b1a:0:7:a01:100/120
|
||
netip.MustParsePrefix("fd7a:115c:a1e0:b1a:0:7:a01:100/120"),
|
||
}
|
||
_, err := impl.lb.EditPrefs(&ipn.MaskedPrefs{
|
||
Prefs: *prefs,
|
||
AdvertiseRoutesSet: true,
|
||
})
|
||
if err != nil {
|
||
tb.Fatalf("EditPrefs: %v", err)
|
||
}
|
||
return impl
|
||
}
|
||
|
||
testCases := []struct {
|
||
name string
|
||
src, dst netip.AddrPort
|
||
want bool
|
||
}{
|
||
// Reply from service IP to localhost should be sent to host,
|
||
// not over WireGuard.
|
||
{
|
||
name: "from_service_ip_to_localhost",
|
||
src: netip.AddrPortFrom(serviceIP, 53),
|
||
dst: netip.MustParseAddrPort("127.0.0.1:9999"),
|
||
want: true,
|
||
},
|
||
{
|
||
name: "from_service_ip_to_localhost_v6",
|
||
src: netip.AddrPortFrom(serviceIPv6, 53),
|
||
dst: netip.MustParseAddrPort("[::1]:9999"),
|
||
want: true,
|
||
},
|
||
// A reply from the local IP to a remote host isn't sent to the
|
||
// host, but rather over WireGuard.
|
||
{
|
||
name: "local_ip_to_remote",
|
||
src: netip.AddrPortFrom(selfIP4, 12345),
|
||
dst: netip.MustParseAddrPort("100.64.99.88:7777"),
|
||
want: false,
|
||
},
|
||
{
|
||
name: "local_ip_to_remote_v6",
|
||
src: netip.AddrPortFrom(selfIP6, 12345),
|
||
dst: netip.MustParseAddrPort("[fd7a:115:a1e0::99]:7777"),
|
||
want: false,
|
||
},
|
||
// A reply from a 4via6 address to a remote host isn't sent to
|
||
// the local host, but rather over WireGuard. See:
|
||
// https://github.com/tailscale/tailscale/issues/12448
|
||
{
|
||
name: "4via6_to_remote",
|
||
|
||
// $ tailscale debug via 7 10.1.1.99/24
|
||
// fd7a:115c:a1e0:b1a:0:7:a01:163/120
|
||
src: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:163]:12345"),
|
||
dst: netip.MustParseAddrPort("[fd7a:115:a1e0::99]:7777"),
|
||
want: false,
|
||
},
|
||
// However, a reply from a 4via6 address to the local Tailscale
|
||
// IP for this host *is* sent to the local host. See:
|
||
// https://github.com/tailscale/tailscale/issues/11304
|
||
{
|
||
name: "4via6_to_local",
|
||
|
||
// $ tailscale debug via 7 10.1.1.99/24
|
||
// fd7a:115c:a1e0:b1a:0:7:a01:163/120
|
||
src: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:163]:12345"),
|
||
dst: netip.AddrPortFrom(selfIP6, 7777),
|
||
want: true,
|
||
},
|
||
// Traffic from a 4via6 address that we're not handling to
|
||
// either the local Tailscale IP or a remote host is sent
|
||
// outbound.
|
||
//
|
||
// In most cases, we won't see this type of traffic in the
|
||
// shouldSendToHost function, but let's confirm.
|
||
{
|
||
name: "other_4via6_to_local",
|
||
|
||
// $ tailscale debug via 4444 10.1.1.88/24
|
||
// fd7a:115c:a1e0:b1a:0:7:a01:163/120
|
||
src: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:115c:a01:158]:12345"),
|
||
dst: netip.AddrPortFrom(selfIP6, 7777),
|
||
want: false,
|
||
},
|
||
{
|
||
name: "other_4via6_to_remote",
|
||
|
||
// $ tailscale debug via 4444 10.1.1.88/24
|
||
// fd7a:115c:a1e0:b1a:0:7:a01:163/120
|
||
src: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:115c:a01:158]:12345"),
|
||
dst: netip.MustParseAddrPort("[fd7a:115:a1e0::99]:7777"),
|
||
want: false,
|
||
},
|
||
}
|
||
|
||
for _, tt := range testCases {
|
||
t.Run(tt.name, func(t *testing.T) {
|
||
var pkt *stack.PacketBuffer
|
||
if tt.src.Addr().Is4() {
|
||
pkt = makeUDP4PacketBuffer(tt.src, tt.dst)
|
||
} else {
|
||
pkt = makeUDP6PacketBuffer(tt.src, tt.dst)
|
||
}
|
||
|
||
ns := makeTestNetstack(t)
|
||
if got := ns.shouldSendToHost(pkt); got != tt.want {
|
||
t.Errorf("shouldSendToHost returned %v, want %v", got, tt.want)
|
||
}
|
||
})
|
||
}
|
||
}
|
||
|
||
func makeUDP4PacketBuffer(src, dst netip.AddrPort) *stack.PacketBuffer {
|
||
if !src.Addr().Is4() || !dst.Addr().Is4() {
|
||
panic("src and dst must be IPv4")
|
||
}
|
||
|
||
data := []byte("hello world\n")
|
||
|
||
packetLen := header.IPv4MinimumSize + header.UDPMinimumSize
|
||
pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
|
||
ReserveHeaderBytes: packetLen,
|
||
Payload: buffer.MakeWithData(data),
|
||
})
|
||
|
||
// Initialize the UDP header.
|
||
udp := header.UDP(pkt.TransportHeader().Push(header.UDPMinimumSize))
|
||
pkt.TransportProtocolNumber = header.UDPProtocolNumber
|
||
|
||
length := uint16(pkt.Size())
|
||
udp.Encode(&header.UDPFields{
|
||
SrcPort: src.Port(),
|
||
DstPort: dst.Port(),
|
||
Length: length,
|
||
})
|
||
|
||
// Add IP header
|
||
ipHdr := header.IPv4(pkt.NetworkHeader().Push(header.IPv4MinimumSize))
|
||
pkt.NetworkProtocolNumber = header.IPv4ProtocolNumber
|
||
ipHdr.Encode(&header.IPv4Fields{
|
||
TotalLength: uint16(packetLen),
|
||
Protocol: uint8(header.UDPProtocolNumber),
|
||
SrcAddr: tcpip.AddrFrom4(src.Addr().As4()),
|
||
DstAddr: tcpip.AddrFrom4(dst.Addr().As4()),
|
||
Checksum: 0,
|
||
})
|
||
|
||
return pkt
|
||
}
|
||
|
||
func makeUDP6PacketBuffer(src, dst netip.AddrPort) *stack.PacketBuffer {
|
||
if !src.Addr().Is6() || !dst.Addr().Is6() {
|
||
panic("src and dst must be IPv6")
|
||
}
|
||
data := []byte("hello world\n")
|
||
|
||
packetLen := header.IPv6MinimumSize + header.UDPMinimumSize
|
||
pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
|
||
ReserveHeaderBytes: packetLen,
|
||
Payload: buffer.MakeWithData(data),
|
||
})
|
||
|
||
srcAddr := tcpip.AddrFrom16(src.Addr().As16())
|
||
dstAddr := tcpip.AddrFrom16(dst.Addr().As16())
|
||
|
||
// Add IP header
|
||
ipHdr := header.IPv6(pkt.NetworkHeader().Push(header.IPv6MinimumSize))
|
||
pkt.NetworkProtocolNumber = header.IPv6ProtocolNumber
|
||
ipHdr.Encode(&header.IPv6Fields{
|
||
SrcAddr: srcAddr,
|
||
DstAddr: dstAddr,
|
||
PayloadLength: uint16(header.UDPMinimumSize + len(data)),
|
||
TransportProtocol: header.UDPProtocolNumber,
|
||
HopLimit: 64,
|
||
})
|
||
|
||
// Initialize the UDP header.
|
||
udp := header.UDP(pkt.TransportHeader().Push(header.UDPMinimumSize))
|
||
pkt.TransportProtocolNumber = header.UDPProtocolNumber
|
||
|
||
length := uint16(pkt.Size())
|
||
udp.Encode(&header.UDPFields{
|
||
SrcPort: src.Port(),
|
||
DstPort: dst.Port(),
|
||
Length: length,
|
||
})
|
||
|
||
// Calculate the UDP pseudo-header checksum.
|
||
xsum := header.PseudoHeaderChecksum(header.UDPProtocolNumber, srcAddr, dstAddr, uint16(len(udp)))
|
||
udp.SetChecksum(^udp.CalculateChecksum(xsum))
|
||
|
||
return pkt
|
||
}
|