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syncs, all: move to using Go's new atomic types instead of ours 

Fixes #5185

Change-Id: I850dd532559af78c3895e2924f8237ccc328449d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-08-03 21:51:02 -07:00 committed by Brad Fitzpatrick
parent 9bb5a038e5
commit 4950fe60bd
20 changed files with 101 additions and 143 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
cmd/tailscale/cli/cli.go
View File

@ -29,7 +29,6 @@ import (
"tailscale.com/ipn"
"tailscale.com/paths"
"tailscale.com/safesocket"
"tailscale.com/syncs"
"tailscale.com/version/distro"
)
@ -230,8 +229,6 @@ var rootArgs struct {
socket string
}
var gotSignal syncs.AtomicBool
func connect(ctx context.Context) (net.Conn, *ipn.BackendClient, context.Context, context.CancelFunc) {
s := safesocket.DefaultConnectionStrategy(rootArgs.socket)
c, err := safesocket.Connect(s)
@ -257,7 +254,6 @@ func connect(ctx context.Context) (net.Conn, *ipn.BackendClient, context.Context
signal.Reset(syscall.SIGINT, syscall.SIGTERM)
return
}
gotSignal.Set(true)
c.Close()
cancel()
}()

2
cmd/tailscale/depaware.txt
View File

@ -71,7 +71,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
💣 tailscale.com/net/tshttpproxy from tailscale.com/derp/derphttp+
tailscale.com/paths from tailscale.com/cmd/tailscale/cli+
tailscale.com/safesocket from tailscale.com/cmd/tailscale/cli+
tailscale.com/syncs from tailscale.com/net/interfaces+
tailscale.com/syncs from tailscale.com/net/netcheck
tailscale.com/tailcfg from tailscale.com/cmd/tailscale/cli+
tailscale.com/tka from tailscale.com/types/key
W tailscale.com/tsconst from tailscale.com/net/interfaces

2
cmd/tailscaled/depaware.txt
View File

@ -241,7 +241,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/safesocket from tailscale.com/client/tailscale+
tailscale.com/smallzstd from tailscale.com/ipn/ipnserver+
LD 💣 tailscale.com/ssh/tailssh from tailscale.com/cmd/tailscaled
tailscale.com/syncs from tailscale.com/control/controlknobs+
tailscale.com/syncs from tailscale.com/net/netcheck+
tailscale.com/tailcfg from tailscale.com/client/tailscale/apitype+
LD tailscale.com/tempfork/gliderlabs/ssh from tailscale.com/ssh/tailssh
tailscale.com/tka from tailscale.com/types/key+

9
control/controlknobs/controlknobs.go
View File

@ -7,12 +7,13 @@
package controlknobs
import (
"sync/atomic"
"tailscale.com/envknob"
"tailscale.com/syncs"
)
// disableUPnP indicates whether to attempt UPnP mapping.
var disableUPnP syncs.AtomicBool
var disableUPnP atomic.Bool
func init() {
SetDisableUPnP(envknob.Bool("TS_DISABLE_UPNP"))
@ -21,11 +22,11 @@ func init() {
// DisableUPnP reports the last reported value from control
// whether UPnP portmapping should be disabled.
func DisableUPnP() bool {
return disableUPnP.Get()
return disableUPnP.Load()
}
// SetDisableUPnP sets whether control says that UPnP should be
// disabled.
func SetDisableUPnP(v bool) {
disableUPnP.Set(v)
disableUPnP.Store(v)
}

23
derp/derp_server.go
View File

@ -41,7 +41,6 @@ import (
"tailscale.com/disco"
"tailscale.com/envknob"
"tailscale.com/metrics"
"tailscale.com/syncs"
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/types/pad32"
@ -232,7 +231,7 @@ type dupClientSet struct {
}
func (s *dupClientSet) ActiveClient() *sclient {
if s.last != nil && !s.last.isDisabled.Get() {
if s.last != nil && !s.last.isDisabled.Load() {
return s.last
}
return nil
@ -499,8 +498,8 @@ func (s *Server) registerClient(c *sclient) {
s.dupClientConns.Add(2) // both old and new count
s.dupClientConnTotal.Add(1)
old := set.ActiveClient()
old.isDup.Set(true)
c.isDup.Set(true)
old.isDup.Store(true)
c.isDup.Store(true)
s.clients[c.key] = &dupClientSet{
last: c,
set: map[*sclient]bool{
@ -512,7 +511,7 @@ func (s *Server) registerClient(c *sclient) {
case *dupClientSet:
s.dupClientConns.Add(1) // the gauge
s.dupClientConnTotal.Add(1) // the counter
c.isDup.Set(true)
c.isDup.Store(true)
set.set[c] = true
set.last = c
set.sendHistory = append(set.sendHistory, c)
@ -571,8 +570,8 @@ func (s *Server) unregisterClient(c *sclient) {
if remain == nil {
panic("unexpected nil remain from single element dup set")
}
remain.isDisabled.Set(false)
remain.isDup.Set(false)
remain.isDisabled.Store(false)
remain.isDup.Store(false)
s.clients[c.key] = singleClient{remain}
}
}
@ -1073,11 +1072,11 @@ func (s *Server) sendServerKey(lw *lazyBufioWriter) error {
}
func (s *Server) noteClientActivity(c *sclient) {
if !c.isDup.Get() {
if !c.isDup.Load() {
// Fast path for clients that aren't in a dup set.
return
}
if c.isDisabled.Get() {
if c.isDisabled.Load() {
// If they're already disabled, no point checking more.
return
}
@ -1112,7 +1111,7 @@ func (s *Server) noteClientActivity(c *sclient) {
for _, prior := range ds.sendHistory {
if prior == c {
ds.ForeachClient(func(c *sclient) {
c.isDisabled.Set(true)
c.isDisabled.Store(true)
})
break
}
@ -1253,8 +1252,8 @@ type sclient struct {
peerGone chan key.NodePublic // write request that a previous sender has disconnected (not used by mesh peers)
meshUpdate chan struct{} // write request to write peerStateChange
canMesh bool // clientInfo had correct mesh token for inter-region routing
isDup syncs.AtomicBool // whether more than 1 sclient for key is connected
isDisabled syncs.AtomicBool // whether sends to this peer are disabled due to active/active dups
isDup atomic.Bool // whether more than 1 sclient for key is connected
isDisabled atomic.Bool // whether sends to this peer are disabled due to active/active dups
// replaceLimiter controls how quickly two connections with
// the same client key can kick each other off the server by

8
derp/derp_test.go
View File

@ -958,10 +958,10 @@ func TestServerDupClients(t *testing.T) {
t.Error("wrong single client")
return
}
if want.isDup.Get() {
if want.isDup.Load() {
t.Errorf("unexpected isDup on singleClient")
}
if want.isDisabled.Get() {
if want.isDisabled.Load() {
t.Errorf("unexpected isDisabled on singleClient")
}
case nil:
@ -1004,13 +1004,13 @@ func TestServerDupClients(t *testing.T) {
}
checkDup := func(t *testing.T, c *sclient, want bool) {
t.Helper()
if got := c.isDup.Get(); got != want {
if got := c.isDup.Load(); got != want {
t.Errorf("client %q isDup = %v; want %v", clientName[c], got, want)
}
}
checkDisabled := func(t *testing.T, c *sclient, want bool) {
t.Helper()
if got := c.isDisabled.Get(); got != want {
if got := c.isDisabled.Load(); got != want {
t.Errorf("client %q isDisabled = %v; want %v", clientName[c], got, want)
}
}

7
ipn/ipnlocal/local.go
View File

@ -40,7 +40,6 @@ import (
"tailscale.com/net/tsdial"
"tailscale.com/paths"
"tailscale.com/portlist"
"tailscale.com/syncs"
"tailscale.com/tailcfg"
"tailscale.com/tka"
"tailscale.com/types/dnstype"
@ -127,7 +126,7 @@ type LocalBackend struct {
serverURL string // tailcontrol URL
newDecompressor func() (controlclient.Decompressor, error)
varRoot string // or empty if SetVarRoot never called
sshAtomicBool syncs.AtomicBool
sshAtomicBool atomic.Bool
shutdownCalled bool // if Shutdown has been called
filterAtomic atomic.Pointer[filter.Filter]
@ -1740,7 +1739,7 @@ func (b *LocalBackend) loadStateLocked(key ipn.StateKey, prefs *ipn.Prefs) (err
// setAtomicValuesFromPrefs populates sshAtomicBool and containsViaIPFuncAtomic
// from the prefs p, which may be nil.
func (b *LocalBackend) setAtomicValuesFromPrefs(p *ipn.Prefs) {
b.sshAtomicBool.Set(p != nil && p.RunSSH && canSSH)
b.sshAtomicBool.Store(p != nil && p.RunSSH && canSSH)
if p == nil {
b.containsViaIPFuncAtomic.Store(tsaddr.NewContainsIPFunc(nil))
@ -3053,7 +3052,7 @@ func (b *LocalBackend) ResetForClientDisconnect() {
b.setAtomicValuesFromPrefs(nil)
}
func (b *LocalBackend) ShouldRunSSH() bool { return b.sshAtomicBool.Get() && canSSH }
func (b *LocalBackend) ShouldRunSSH() bool { return b.sshAtomicBool.Load() && canSSH }
// ShouldHandleViaIP reports whether whether ip is an IPv6 address in the
// Tailscale ULA's v6 "via" range embedding an IPv4 address to be forwarded to

10
ipn/ipnlocal/peerapi.go
View File

@ -26,6 +26,7 @@ import (
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"unicode"
"unicode/utf8"
@ -41,7 +42,6 @@ import (
"tailscale.com/net/interfaces"
"tailscale.com/net/netaddr"
"tailscale.com/net/netutil"
"tailscale.com/syncs"
"tailscale.com/tailcfg"
"tailscale.com/util/clientmetric"
"tailscale.com/wgengine"
@ -58,7 +58,7 @@ type peerAPIServer struct {
b *LocalBackend
rootDir string // empty means file receiving unavailable
selfNode *tailcfg.Node
knownEmpty syncs.AtomicBool
knownEmpty atomic.Bool
resolver *resolver.Resolver
// directFileMode is whether we're writing files directly to a
@ -144,7 +144,7 @@ func (s *peerAPIServer) hasFilesWaiting() bool {
if s == nil || s.rootDir == "" || s.directFileMode {
return false
}
if s.knownEmpty.Get() {
if s.knownEmpty.Load() {
// Optimization: this is usually empty, so avoid opening
// the directory and checking. We can't cache the actual
// has-files-or-not values as the macOS/iOS client might
@ -185,7 +185,7 @@ func (s *peerAPIServer) hasFilesWaiting() bool {
}
}
if err == io.EOF {
s.knownEmpty.Set(true)
s.knownEmpty.Store(true)
}
if err != nil {
break
@ -808,7 +808,7 @@ func (h *peerAPIHandler) handlePeerPut(w http.ResponseWriter, r *http.Request) {
// TODO: some real response
success = true
io.WriteString(w, "{}\n")
h.ps.knownEmpty.Set(false)
h.ps.knownEmpty.Store(false)
h.ps.b.sendFileNotify()
}

2
ipn/ipnlocal/peerapi_test.go
View File

@ -504,7 +504,7 @@ func TestDeletedMarkers(t *testing.T) {
nothingWaiting := func() {
t.Helper()
ps.knownEmpty.Set(false)
ps.knownEmpty.Store(false)
if ps.hasFilesWaiting() {
t.Fatal("unexpected files waiting")
}

18
ipn/ipnlocal/state_test.go
View File

@ -7,6 +7,7 @@ package ipnlocal
import (
"context"
"sync"
"sync/atomic"
"testing"
"time"
@ -15,7 +16,6 @@ import (
"tailscale.com/control/controlclient"
"tailscale.com/ipn"
"tailscale.com/ipn/store/mem"
"tailscale.com/syncs"
"tailscale.com/tailcfg"
"tailscale.com/types/empty"
"tailscale.com/types/key"
@ -91,7 +91,7 @@ type mockControl struct {
opts controlclient.Options
logfActual logger.Logf
statusFunc func(controlclient.Status)
preventLog syncs.AtomicBool
preventLog atomic.Bool
mu sync.Mutex
calls []string
@ -108,7 +108,7 @@ func newMockControl(tb testing.TB) *mockControl {
}
func (cc *mockControl) logf(format string, args ...any) {
if cc.preventLog.Get() || cc.logfActual == nil {
if cc.preventLog.Load() || cc.logfActual == nil {
return
}
cc.logfActual(format, args...)
@ -292,7 +292,7 @@ func TestStateMachine(t *testing.T) {
cc := newMockControl(t)
cc.statusFunc = b.setClientStatus
t.Cleanup(func() { cc.preventLog.Set(true) }) // hacky way to pacify issue 3020
t.Cleanup(func() { cc.preventLog.Store(true) }) // hacky way to pacify issue 3020
b.SetControlClientGetterForTesting(func(opts controlclient.Options) (controlclient.Client, error) {
cc.mu.Lock()
@ -311,7 +311,7 @@ func TestStateMachine(t *testing.T) {
notifies.expect(0)
b.SetNotifyCallback(func(n ipn.Notify) {
if cc.preventLog.Get() {
if cc.preventLog.Load() {
return
}
if n.State != nil ||
@ -920,7 +920,7 @@ func TestStateMachine(t *testing.T) {
type testStateStorage struct {
mem mem.Store
written syncs.AtomicBool
written atomic.Bool
}
func (s *testStateStorage) ReadState(id ipn.StateKey) ([]byte, error) {
@ -928,18 +928,18 @@ func (s *testStateStorage) ReadState(id ipn.StateKey) ([]byte, error) {
}
func (s *testStateStorage) WriteState(id ipn.StateKey, bs []byte) error {
s.written.Set(true)
s.written.Store(true)
return s.mem.WriteState(id, bs)
}
// awaitWrite clears the "I've seen writes" bit, in prep for a future
// call to sawWrite to see if a write arrived.
func (s *testStateStorage) awaitWrite() { s.written.Set(false) }
func (s *testStateStorage) awaitWrite() { s.written.Store(false) }
// sawWrite reports whether there's been a WriteState call since the most
// recent awaitWrite call.
func (s *testStateStorage) sawWrite() bool {
v := s.written.Get()
v := s.written.Load()
s.awaitWrite()
return v
}

7
logtail/logtail.go
View File

@ -23,7 +23,6 @@ import (
"tailscale.com/logtail/backoff"
"tailscale.com/net/interfaces"
"tailscale.com/syncs"
tslogger "tailscale.com/types/logger"
"tailscale.com/wgengine/monitor"
)
@ -448,15 +447,15 @@ func (l *Logger) Flush() error {
}
// logtailDisabled is whether logtail uploads to logcatcher are disabled.
var logtailDisabled syncs.AtomicBool
var logtailDisabled atomic.Bool
// Disable disables logtail uploads for the lifetime of the process.
func Disable() {
logtailDisabled.Set(true)
logtailDisabled.Store(true)
}
func (l *Logger) sendLocked(jsonBlob []byte) (int, error) {
if logtailDisabled.Get() {
if logtailDisabled.Load() {
return len(jsonBlob), nil
}
n, err := l.buffer.Write(jsonBlob)

8
net/interfaces/interfaces_linux.go
View File

@ -17,13 +17,13 @@ import (
"os/exec"
"runtime"
"strings"
"sync/atomic"
"github.com/jsimonetti/rtnetlink"
"github.com/mdlayher/netlink"
"go4.org/mem"
"golang.org/x/sys/unix"
"tailscale.com/net/netaddr"
"tailscale.com/syncs"
"tailscale.com/util/lineread"
)
@ -31,7 +31,7 @@ func init() {
likelyHomeRouterIP = likelyHomeRouterIPLinux
}
var procNetRouteErr syncs.AtomicBool
var procNetRouteErr atomic.Bool
// errStopReading is a sentinel error value used internally by
// lineread.File callers to stop reading. It doesn't escape to
@ -47,7 +47,7 @@ ens18 00000000 0100000A 0003 0 0 0 00000000
ens18 0000000A 00000000 0001 0 0 0 0000FFFF 0 0 0
*/
func likelyHomeRouterIPLinux() (ret netip.Addr, ok bool) {
if procNetRouteErr.Get() {
if procNetRouteErr.Load() {
// If we failed to read /proc/net/route previously, don't keep trying.
// But if we're on Android, go into the Android path.
if runtime.GOOS == "android" {
@ -93,7 +93,7 @@ func likelyHomeRouterIPLinux() (ret netip.Addr, ok bool) {
err = nil
}
if err != nil {
procNetRouteErr.Set(true)
procNetRouteErr.Store(true)
if runtime.GOOS == "android" {
return likelyHomeRouterIPAndroid()
}

10
net/netns/netns.go
View File

@ -18,25 +18,25 @@ import (
"context"
"net"
"net/netip"
"sync/atomic"
"tailscale.com/net/netknob"
"tailscale.com/syncs"
"tailscale.com/types/logger"
)
var disabled syncs.AtomicBool
var disabled atomic.Bool
// SetEnabled enables or disables netns for the process.
// It defaults to being enabled.
func SetEnabled(on bool) {
disabled.Set(!on)
disabled.Store(!on)
}
// Listener returns a new net.Listener with its Control hook func
// initialized as necessary to run in logical network namespace that
// doesn't route back into Tailscale.
func Listener(logf logger.Logf) *net.ListenConfig {
if disabled.Get() {
if disabled.Load() {
return new(net.ListenConfig)
}
return &net.ListenConfig{Control: control(logf)}
@ -57,7 +57,7 @@ func NewDialer(logf logger.Logf) Dialer {
// handles using a SOCKS if configured in the environment with
// ALL_PROXY.
func FromDialer(logf logger.Logf, d *net.Dialer) Dialer {
if disabled.Get() {
if disabled.Load() {
return d
}
d.Control = control(logf)

12
net/portmapper/igd_test.go
View File

@ -12,10 +12,10 @@ import (
"net/http/httptest"
"net/netip"
"sync"
"sync/atomic"
"testing"
"tailscale.com/net/netaddr"
"tailscale.com/syncs"
"tailscale.com/types/logger"
)
@ -26,7 +26,7 @@ type TestIGD struct {
pxpConn net.PacketConn // for NAT-PMP and/or PCP
ts *httptest.Server
logf logger.Logf
closed syncs.AtomicBool
closed atomic.Bool
// do* will log which packets are sent, but will not reply to unexpected packets.
@ -71,7 +71,7 @@ func NewTestIGD(logf logger.Logf, t TestIGDOptions) (*TestIGD, error) {
d.logf = func(msg string, args ...any) {
// Don't log after the device has closed;
// stray trailing logging angers testing.T.Logf.
if d.closed.Get() {
if d.closed.Load() {
return
}
logf(msg, args...)
@ -107,7 +107,7 @@ func testIPAndGateway() (gw, ip netip.Addr, ok bool) {
}
func (d *TestIGD) Close() error {
d.closed.Set(true)
d.closed.Store(true)
d.ts.Close()
d.upnpConn.Close()
d.pxpConn.Close()
@ -135,7 +135,7 @@ func (d *TestIGD) serveUPnPDiscovery() {
for {
n, src, err := d.upnpConn.ReadFrom(buf)
if err != nil {
if !d.closed.Get() {
if !d.closed.Load() {
d.logf("serveUPnP failed: %v", err)
}
return
@ -162,7 +162,7 @@ func (d *TestIGD) servePxP() {
for {
n, a, err := d.pxpConn.ReadFrom(buf)
if err != nil {
if !d.closed.Get() {
if !d.closed.Load() {
d.logf("servePxP failed: %v", err)
}
return

10
portlist/portlist_linux.go
View File

@ -14,12 +14,12 @@ import (
"runtime"
"strconv"
"strings"
"sync/atomic"
"syscall"
"time"
"go4.org/mem"
"golang.org/x/sys/unix"
"tailscale.com/syncs"
)
// Reading the sockfiles on Linux is very fast, so we can do it often.
@ -27,7 +27,7 @@ const pollInterval = 1 * time.Second
var sockfiles = []string{"/proc/net/tcp", "/proc/net/tcp6", "/proc/net/udp", "/proc/net/udp6"}
var sawProcNetPermissionErr syncs.AtomicBool
var sawProcNetPermissionErr atomic.Bool
const (
v6Localhost = "00000000000000000000000001000000:"
@ -37,7 +37,7 @@ const (
)
func listPorts() (List, error) {
if sawProcNetPermissionErr.Get() {
if sawProcNetPermissionErr.Load() {
return nil, nil
}
var ret []Port
@ -48,13 +48,13 @@ func listPorts() (List, error) {
// https://developer.android.com/about/versions/10/privacy/changes#proc-net-filesystem
// Ignore it rather than have the system log about our violation.
if runtime.GOOS == "android" && syscall.Access(fname, unix.R_OK) != nil {
sawProcNetPermissionErr.Set(true)
sawProcNetPermissionErr.Store(true)
return nil, nil
}
f, err := os.Open(fname)
if os.IsPermission(err) {
sawProcNetPermissionErr.Set(true)
sawProcNetPermissionErr.Store(true)
return nil, nil
}
if err != nil {

14
prober/prober_test.go
View File

@ -12,11 +12,11 @@ import (
"fmt"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"tailscale.com/syncs"
"tailscale.com/tstest"
"tailscale.com/tsweb"
)
@ -131,10 +131,10 @@ func TestExpvar(t *testing.T) {
clk := newFakeTime()
p := newForTest(clk.Now, clk.NewTicker)
var succeed syncs.AtomicBool
var succeed atomic.Bool
p.Run("probe", probeInterval, map[string]string{"label": "value"}, func(context.Context) error {
clk.Advance(aFewMillis)
if succeed.Get() {
if succeed.Load() {
return nil
}
return errors.New("failing, as instructed by test")
@ -172,7 +172,7 @@ func TestExpvar(t *testing.T) {
Result: false,
})
succeed.Set(true)
succeed.Store(true)
clk.Advance(probeInterval + halfProbeInterval)
st := epoch.Add(probeInterval + halfProbeInterval + aFewMillis)
@ -189,10 +189,10 @@ func TestPrometheus(t *testing.T) {
clk := newFakeTime()
p := newForTest(clk.Now, clk.NewTicker)
var succeed syncs.AtomicBool
var succeed atomic.Bool
p.Run("testprobe", probeInterval, map[string]string{"label": "value"}, func(context.Context) error {
clk.Advance(aFewMillis)
if succeed.Get() {
if succeed.Load() {
return nil
}
return errors.New("failing, as instructed by test")
@ -219,7 +219,7 @@ probe_result{name="testprobe",label="value"} 0
t.Fatal(err)
}
succeed.Set(true)
succeed.Store(true)
clk.Advance(probeInterval + halfProbeInterval)
err = tstest.WaitFor(convergenceTimeout, func() error {

8
ssh/tailssh/tailssh.go
View File

@ -30,6 +30,7 @@ import (
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
gossh "github.com/tailscale/golang-x-crypto/ssh"
@ -37,7 +38,6 @@ import (
"tailscale.com/ipn/ipnlocal"
"tailscale.com/logtail/backoff"
"tailscale.com/net/tsaddr"
"tailscale.com/syncs"
"tailscale.com/tailcfg"
"tailscale.com/tempfork/gliderlabs/ssh"
"tailscale.com/types/logger"
@ -645,7 +645,7 @@ func (c *conn) resolveTerminalActionLocked(s ssh.Session, cr *contextReader) (ac
action = c.action0
var awaitReadOnce sync.Once // to start Reads on cr
var sawInterrupt syncs.AtomicBool
var sawInterrupt atomic.Bool
var wg sync.WaitGroup
defer wg.Wait() // wait for awaitIntrOnce's goroutine to exit
@ -687,7 +687,7 @@ func (c *conn) resolveTerminalActionLocked(s ssh.Session, cr *contextReader) (ac
return
}
if n > 0 && buf[0] == 0x03 { // Ctrl-C
sawInterrupt.Set(true)
sawInterrupt.Store(true)
s.Stderr().Write([]byte("Canceled.\r\n"))
s.Exit(1)
return
@ -699,7 +699,7 @@ func (c *conn) resolveTerminalActionLocked(s ssh.Session, cr *contextReader) (ac
var err error
action, err = c.fetchSSHAction(ctx, url)
if err != nil {
if sawInterrupt.Get() {
if sawInterrupt.Load() {
metricTerminalInterrupt.Add(1)
return nil, fmt.Errorf("aborted by user")
} else {

36
syncs/syncs.go
View File

@ -68,42 +68,6 @@ func (wg *WaitGroupChan) Decr() {
// Wait blocks until the WaitGroupChan counter is zero.
func (wg *WaitGroupChan) Wait() { <-wg.done }
// AtomicBool is an atomic boolean.
type AtomicBool int32
func (b *AtomicBool) Set(v bool) {
var n int32
if v {
n = 1
}
atomic.StoreInt32((*int32)(b), n)
}
// Swap sets b to v and reports whether it changed.
func (b *AtomicBool) Swap(v bool) (changed bool) {
var n int32
if v {
n = 1
}
old := atomic.SwapInt32((*int32)(b), n)
return old != n
}
func (b *AtomicBool) Get() bool {
return atomic.LoadInt32((*int32)(b)) != 0
}
// AtomicUint32 is an atomic uint32.
type AtomicUint32 uint32
func (b *AtomicUint32) Set(v uint32) {
atomic.StoreUint32((*uint32)(b), v)
}
func (b *AtomicUint32) Get() uint32 {
return atomic.LoadUint32((*uint32)(b))
}
// Semaphore is a counting semaphore.
//
// Use NewSemaphore to create one.

44
wgengine/magicsock/magicsock.go
View File

@ -286,20 +286,20 @@ type Conn struct {
// is named negatively because in early start-up, we don't yet
// necessarily have a netcheck.Report and don't want to skip
// logging.
noV4, noV6 syncs.AtomicBool
noV4, noV6 atomic.Bool
// noV4Send is whether IPv4 UDP is known to be unable to transmit
// at all. This could happen if the socket is in an invalid state
// (as can happen on darwin after a network link status change).
noV4Send syncs.AtomicBool
noV4Send atomic.Bool
// networkUp is whether the network is up (some interface is up
// with IPv4 or IPv6). It's used to suppress log spam and prevent
// new connection that'll fail.
networkUp syncs.AtomicBool
networkUp atomic.Bool
// havePrivateKey is whether privateKey is non-zero.
havePrivateKey syncs.AtomicBool
havePrivateKey atomic.Bool
publicKeyAtomic atomic.Value // of key.NodePublic (or NodeKey zero value if !havePrivateKey)
// derpMapAtomic is the same as derpMap, but without requiring
@ -310,7 +310,7 @@ type Conn struct {
lastNetCheckReport atomic.Pointer[netcheck.Report]
// port is the preferred port from opts.Port; 0 means auto.
port syncs.AtomicUint32
port atomic.Uint32
// ============================================================
// mu guards all following fields; see userspaceEngine lock
@ -531,7 +531,7 @@ func newConn() *Conn {
}
c.bind = &connBind{Conn: c, closed: true}
c.muCond = sync.NewCond(&c.mu)
c.networkUp.Set(true) // assume up until told otherwise
c.networkUp.Store(true) // assume up until told otherwise
return c
}
@ -542,7 +542,7 @@ func newConn() *Conn {
// It doesn't start doing anything until Start is called.
func NewConn(opts Options) (*Conn, error) {
c := newConn()
c.port.Set(uint32(opts.Port))
c.port.Store(uint32(opts.Port))
c.logf = opts.logf()
c.epFunc = opts.endpointsFunc()
c.derpActiveFunc = opts.derpActiveFunc()
@ -634,7 +634,7 @@ func (c *Conn) updateEndpoints(why string) {
c.muCond.Broadcast()
}()
c.logf("[v1] magicsock: starting endpoint update (%s)", why)
if c.noV4Send.Get() && runtime.GOOS != "js" {
if c.noV4Send.Load() && runtime.GOOS != "js" {
c.mu.Lock()
closed := c.closed
c.mu.Unlock()
@ -736,9 +736,9 @@ func (c *Conn) updateNetInfo(ctx context.Context) (*netcheck.Report, error) {
}
c.lastNetCheckReport.Store(report)
c.noV4.Set(!report.IPv4)
c.noV6.Set(!report.IPv6)
c.noV4Send.Set(!report.IPv4CanSend)
c.noV4.Store(!report.IPv4)
c.noV6.Store(!report.IPv6)
c.noV4Send.Store(!report.IPv4CanSend)
ni := &tailcfg.NetInfo{
DERPLatency: map[string]float64{},
@ -1074,7 +1074,7 @@ func (c *Conn) determineEndpoints(ctx context.Context) ([]tailcfg.Endpoint, erro
// port mapping on their router to the same explicit
// port that tailscaled is running with. Worst case
// it's an invalid candidate mapping.
if port := c.port.Get(); nr.MappingVariesByDestIP.EqualBool(true) && port != 0 {
if port := c.port.Load(); nr.MappingVariesByDestIP.EqualBool(true) && port != 0 {
if ip, _, err := net.SplitHostPort(nr.GlobalV4); err == nil {
addAddr(ipp(net.JoinHostPort(ip, strconv.Itoa(int(port)))), tailcfg.EndpointSTUN4LocalPort)
}
@ -1167,7 +1167,7 @@ func (c *Conn) LocalPort() uint16 {
var errNetworkDown = errors.New("magicsock: network down")
func (c *Conn) networkDown() bool { return !c.networkUp.Get() }
func (c *Conn) networkDown() bool { return !c.networkUp.Load() }
func (c *Conn) Send(b []byte, ep conn.Endpoint) error {
metricSendData.Add(1)
@ -1207,7 +1207,7 @@ func (c *Conn) sendUDPStd(addr netip.AddrPort, b []byte) (sent bool, err error)
switch {
case addr.Addr().Is4():
_, err = c.pconn4.WriteToUDPAddrPort(b, addr)
if err != nil && (c.noV4.Get() || neterror.TreatAsLostUDP(err)) {
if err != nil && (c.noV4.Load() || neterror.TreatAsLostUDP(err)) {
return false, nil
}
case addr.Addr().Is6():
@ -1216,7 +1216,7 @@ func (c *Conn) sendUDPStd(addr netip.AddrPort, b []byte) (sent bool, err error)
return false, nil
}
_, err = c.pconn6.WriteToUDPAddrPort(b, addr)
if err != nil && (c.noV6.Get() || neterror.TreatAsLostUDP(err)) {
if err != nil && (c.noV6.Load() || neterror.TreatAsLostUDP(err)) {
return false, nil
}
default:
@ -1674,7 +1674,7 @@ func (c *Conn) receiveIP(b []byte, ipp netip.AddrPort, cache *ippEndpointCache)
if c.handleDiscoMessage(b, ipp, key.NodePublic{}) {
return nil, false
}
if !c.havePrivateKey.Get() {
if !c.havePrivateKey.Load() {
// If we have no private key, we're logged out or
// stopped. Don't try to pass these wireguard packets
// up to wireguard-go; it'll just complain (issue 1167).
@ -2140,12 +2140,12 @@ func (c *Conn) discoInfoLocked(k key.DiscoPublic) *discoInfo {
func (c *Conn) SetNetworkUp(up bool) {
c.mu.Lock()
defer c.mu.Unlock()
if c.networkUp.Get() == up {
if c.networkUp.Load() == up {
return
}
c.logf("magicsock: SetNetworkUp(%v)", up)
c.networkUp.Set(up)
c.networkUp.Store(up)
if up {
c.startDerpHomeConnectLocked()
@ -2157,10 +2157,10 @@ func (c *Conn) SetNetworkUp(up bool) {
// SetPreferredPort sets the connection's preferred local port.
func (c *Conn) SetPreferredPort(port uint16) {
if uint16(c.port.Get()) == port {
if uint16(c.port.Load()) == port {
return
}
c.port.Set(uint32(port))
c.port.Store(uint32(port))
if err := c.rebind(dropCurrentPort); err != nil {
c.logf("%w", err)
@ -2185,7 +2185,7 @@ func (c *Conn) SetPrivateKey(privateKey key.NodePrivate) error {
return nil
}
c.privateKey = newKey
c.havePrivateKey.Set(!newKey.IsZero())
c.havePrivateKey.Store(!newKey.IsZero())
if newKey.IsZero() {
c.publicKeyAtomic.Store(key.NodePublic{})
@ -2835,7 +2835,7 @@ func (c *Conn) bindSocket(rucPtr **RebindingUDPConn, network string, curPortFate
// Second best is the port that is currently in use.
// If those fail, fall back to 0.
var ports []uint16
if port := uint16(c.port.Get()); port != 0 {
if port := uint16(c.port.Load()); port != 0 {
ports = append(ports, port)
}
if ruc.pconn != nil && curPortFate == keepCurrentPort {

10
wgengine/router/router_linux.go
View File

@ -14,6 +14,7 @@ import (
"os/exec"
"strconv"
"strings"
"sync/atomic"
"syscall"
"time"
@ -25,7 +26,6 @@ import (
"golang.zx2c4.com/wireguard/tun"
"tailscale.com/envknob"
"tailscale.com/net/tsaddr"
"tailscale.com/syncs"
"tailscale.com/types/logger"
"tailscale.com/types/preftype"
"tailscale.com/util/multierr"
@ -84,7 +84,7 @@ type netfilterRunner interface {
}
type linuxRouter struct {
closed syncs.AtomicBool
closed atomic.Bool
logf func(fmt string, args ...any)
tunname string
linkMon *monitor.Mon
@ -97,7 +97,7 @@ type linuxRouter struct {
// ruleRestorePending is whether a timer has been started to
// restore deleted ip rules.
ruleRestorePending syncs.AtomicBool
ruleRestorePending atomic.Bool
ipRuleFixLimiter *rate.Limiter
// Various feature checks for the network stack.
@ -233,7 +233,7 @@ func (r *linuxRouter) onIPRuleDeleted(table uint8, priority uint32) {
return
}
time.AfterFunc(rr.Delay()+250*time.Millisecond, func() {
if r.ruleRestorePending.Swap(false) && !r.closed.Get() {
if r.ruleRestorePending.Swap(false) && !r.closed.Load() {
r.logf("somebody (likely systemd-networkd) deleted ip rules; restoring Tailscale's")
r.justAddIPRules()
}
@ -258,7 +258,7 @@ func (r *linuxRouter) Up() error {
}
func (r *linuxRouter) Close() error {
r.closed.Set(true)
r.closed.Store(true)
if r.unregLinkMon != nil {
r.unregLinkMon()
}