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wgengine/netstack: change netstack API to require LocalBackend

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The macOS client was forgetting to call netstack.Impl.SetLocalBackend.
Change the API so that it can't be started without one, eliminating this
class of bug. Then update all the callers.

Updates #6764

Change-Id: I2b3a4f31fdfd9fdbbbbfe25a42db0c505373562f
Signed-off-by: Claire Wang <claire@tailscale.com>
Co-authored-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
pull/6838/head
Claire Wang 1 year ago committed by Brad Fitzpatrick
parent 84eaef0bbb
commit a45c9f982a
5 changed files with 54 additions and 63 deletions
Show Stats Download Patch File Download Diff File

3
cmd/tailscaled/tailscaled.go
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@ -533,8 +533,7 @@ func getLocalBackend(ctx context.Context, logf logger.Logf, logid string) (_ *ip
return smallzstd.NewDecoder(nil)
})
configureTaildrop(logf, lb)
ns.SetLocalBackend(lb)
if err := ns.Start(); err != nil {
if err := ns.Start(lb); err != nil {
log.Fatalf("failed to start netstack: %v", err)
}
return lb, nil

9
cmd/tsconnect/wasm/wasm_js.go
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@ -115,9 +115,7 @@ func newIPN(jsConfig js.Value) map[string]any {
}
ns.ProcessLocalIPs = true
ns.ProcessSubnets = true
if err := ns.Start(); err != nil {
log.Fatalf("failed to start netstack: %v", err)
}
dialer.UseNetstackForIP = func(ip netip.Addr) bool {
return true
}
@ -127,16 +125,17 @@ func newIPN(jsConfig js.Value) map[string]any {
logid := lpc.PublicID.String()
srv := ipnserver.New(logf, logid)
lb, err := ipnlocal.NewLocalBackend(logf, logid, store, "wasm", dialer, eng, controlclient.LoginEphemeral)
if err != nil {
log.Fatalf("ipnlocal.NewLocalBackend: %v", err)
}
if err := ns.Start(lb); err != nil {
log.Fatalf("failed to start netstack: %v", err)
}
lb.SetDecompressor(func() (controlclient.Decompressor, error) {
return smallzstd.NewDecoder(nil)
})
srv.SetLocalBackend(lb)
ns.SetLocalBackend(lb)
jsIPN := &jsIPN{
dialer: dialer,

6
tsnet/tsnet.go
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@ -317,9 +317,6 @@ func (s *Server) start() (reterr error) {
}
ns.ProcessLocalIPs = true
ns.ForwardTCPIn = s.forwardTCP
if err := ns.Start(); err != nil {
return fmt.Errorf("failed to start netstack: %w", err)
}
s.netstack = ns
s.dialer.UseNetstackForIP = func(ip netip.Addr) bool {
_, ok := eng.PeerForIP(ip)
@ -349,6 +346,9 @@ func (s *Server) start() (reterr error) {
lb.SetVarRoot(s.rootPath)
logf("tsnet starting with hostname %q, varRoot %q", s.hostname, s.rootPath)
s.lb = lb
if err := ns.Start(lb); err != nil {
return fmt.Errorf("failed to start netstack: %w", err)
}
closePool.addFunc(func() { s.lb.Shutdown() })
lb.SetDecompressor(func() (controlclient.Decompressor, error) {
return smallzstd.NewDecoder(nil)

12
wgengine/netstack/netstack.go
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@ -204,12 +204,6 @@ func (ns *Impl) Close() error {
return nil
}
// SetLocalBackend sets the LocalBackend; it should only be run before
// the Start method is called.
func (ns *Impl) SetLocalBackend(lb *ipnlocal.LocalBackend) {
ns.lb = lb
}
// wrapProtoHandler returns protocol handler h wrapped in a version
// that dynamically reconfigures ns's subnet addresses as needed for
// outbound traffic.
@ -231,7 +225,11 @@ func (ns *Impl) wrapProtoHandler(h func(stack.TransportEndpointID, stack.PacketB
// Start sets up all the handlers so netstack can start working. Implements
// wgengine.FakeImpl.
func (ns *Impl) Start() error {
func (ns *Impl) Start(lb *ipnlocal.LocalBackend) error {
if lb == nil {
panic("nil LocalBackend")
}
ns.lb = lb
ns.e.AddNetworkMapCallback(ns.updateIPs)
// size = 0 means use default buffer size
const tcpReceiveBufferSize = 0

87
wgengine/netstack/netstack_test.go
Unescape Escape View File

@ -17,7 +17,6 @@ import (
"tailscale.com/net/tsaddr"
"tailscale.com/net/tsdial"
"tailscale.com/net/tstun"
"tailscale.com/tstest"
"tailscale.com/types/ipproto"
"tailscale.com/wgengine"
"tailscale.com/wgengine/filter"
@ -50,13 +49,18 @@ func TestInjectInboundLeak(t *testing.T) {
t.Fatal("failed to get internals")
}
lb, err := ipnlocal.NewLocalBackend(logf, "logid", new(mem.Store), "", dialer, eng, 0)
if err != nil {
t.Fatal(err)
}
ns, err := Create(logf, tunWrap, eng, magicSock, dialer, dns)
if err != nil {
t.Fatal(err)
}
defer ns.Close()
ns.ProcessLocalIPs = true
if err := ns.Start(); err != nil {
if err := ns.Start(lb); err != nil {
t.Fatalf("Start: %v", err)
}
ns.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return true })
@ -114,10 +118,16 @@ func makeNetstack(t *testing.T, config func(*Impl)) *Impl {
}
t.Cleanup(func() { ns.Close() })
ns.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return true })
config(ns)
lb, err := ipnlocal.NewLocalBackend(logf, "logid", new(mem.Store), "", dialer, eng, 0)
if err != nil {
t.Fatalf("NewLocalBackend: %v", err)
}
if err := ns.Start(); err != nil {
ns.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return true })
if config != nil {
config(ns)
}
if err := ns.Start(lb); err != nil {
t.Fatalf("Start: %v", err)
}
return ns
@ -257,11 +267,12 @@ func looksLikeATailscaleSelfAddress(addr netip.Addr) bool {
func TestShouldProcessInbound(t *testing.T) {
testCases := []struct {
name string
pkt *packet.Parsed
setup func(*Impl)
want bool
runOnGOOS string
name string
pkt *packet.Parsed
afterStart func(*Impl) // optional; after Impl.Start is called
beforeStart func(*Impl) // optional; before Impl.Start is called
want bool
runOnGOOS string
}{
{
name: "ipv6-via",
@ -275,7 +286,7 @@ func TestShouldProcessInbound(t *testing.T) {
Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:109]:5678"),
TCPFlags: packet.TCPSyn,
},
setup: func(i *Impl) {
afterStart: func(i *Impl) {
prefs := ipn.NewPrefs()
prefs.AdvertiseRoutes = []netip.Prefix{
// $ tailscale debug via 7 10.1.1.0/24
@ -286,7 +297,8 @@ func TestShouldProcessInbound(t *testing.T) {
LegacyMigrationPrefs: prefs,
})
i.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
},
beforeStart: func(i *Impl) {
// This should be handled even if we're
// otherwise not processing local IPs or
// subnets.
@ -307,7 +319,7 @@ func TestShouldProcessInbound(t *testing.T) {
Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:109]:5678"),
TCPFlags: packet.TCPSyn,
},
setup: func(i *Impl) {
afterStart: func(i *Impl) {
prefs := ipn.NewPrefs()
prefs.AdvertiseRoutes = []netip.Prefix{
// tailscale debug via 7 10.1.2.0/24
@ -329,7 +341,7 @@ func TestShouldProcessInbound(t *testing.T) {
Dst: netip.MustParseAddrPort("100.101.102.104:22"),
TCPFlags: packet.TCPSyn,
},
setup: func(i *Impl) {
afterStart: func(i *Impl) {
prefs := ipn.NewPrefs()
prefs.RunSSH = true
i.lb.Start(ipn.Options{
@ -351,7 +363,7 @@ func TestShouldProcessInbound(t *testing.T) {
Dst: netip.MustParseAddrPort("100.101.102.104:22"),
TCPFlags: packet.TCPSyn,
},
setup: func(i *Impl) {
afterStart: func(i *Impl) {
prefs := ipn.NewPrefs()
prefs.RunSSH = false // default, but to be explicit
i.lb.Start(ipn.Options{
@ -372,7 +384,7 @@ func TestShouldProcessInbound(t *testing.T) {
Dst: netip.MustParseAddrPort("100.101.102.104:4567"),
TCPFlags: packet.TCPSyn,
},
setup: func(i *Impl) {
afterStart: func(i *Impl) {
i.ProcessLocalIPs = true
i.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
return addr.String() == "100.101.102.104" // Dst, above
@ -389,9 +401,10 @@ func TestShouldProcessInbound(t *testing.T) {
Dst: netip.MustParseAddrPort("10.1.2.3:4567"),
TCPFlags: packet.TCPSyn,
},
setup: func(i *Impl) {
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.
@ -408,7 +421,12 @@ func TestShouldProcessInbound(t *testing.T) {
Dst: netip.MustParseAddrPort("10.0.0.23:5555"),
TCPFlags: packet.TCPSyn,
},
setup: func(i *Impl) {
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"),
@ -417,10 +435,6 @@ func TestShouldProcessInbound(t *testing.T) {
LegacyMigrationPrefs: prefs,
})
// As if we were running on Linux where netstack isn't used.
i.ProcessSubnets = false
i.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return false })
// Set the PeerAPI port to the Dst port above.
i.peerapiPort4Atomic.Store(5555)
i.peerapiPort6Atomic.Store(5555)
@ -437,30 +451,11 @@ func TestShouldProcessInbound(t *testing.T) {
if tc.runOnGOOS != "" && runtime.GOOS != tc.runOnGOOS {
t.Skipf("skipping on GOOS=%v", runtime.GOOS)
}
impl := makeNetstack(t, func(i *Impl) {
defer t.Logf("netstack setup finished")
logf := tstest.WhileTestRunningLogger(t)
e, err := wgengine.NewFakeUserspaceEngine(logf, 0)
if err != nil {
t.Fatalf("NewFakeUserspaceEngine: %v", err)
}
t.Cleanup(e.Close)
lb, err := ipnlocal.NewLocalBackend(logf, "logid", new(mem.Store), "", new(tsdial.Dialer), e, 0)
if err != nil {
t.Fatalf("NewLocalBackend: %v", err)
}
t.Cleanup(lb.Shutdown)
dir := t.TempDir()
lb.SetVarRoot(dir)
i.SetLocalBackend(lb)
impl := makeNetstack(t, tc.beforeStart)
if tc.afterStart != nil {
tc.afterStart(impl)
}
if tc.setup != nil {
tc.setup(i)
}
})
got := impl.shouldProcessInbound(tc.pkt, nil)
if got != tc.want {
t.Errorf("got shouldProcessInbound()=%v; want %v", got, tc.want)

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