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control/controlknobs, all: add plumbed Knobs type, not global variables

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Previously two tsnet nodes in the same process couldn't have disjoint
sets of controlknob settings from control as both would overwrite each
other's global variables.

This plumbs a new controlknobs.Knobs type around everywhere and hangs
the knobs sent by control on that instead.

Updates #9351

Change-Id: I75338646d36813ed971b4ffad6f9a8b41ec91560
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
pull/9356/head
Brad Fitzpatrick 1 year ago committed by Brad Fitzpatrick
parent d050700a3b
commit 4e91cf20a8
19 changed files with 135 additions and 99 deletions
Show Stats Download Patch File Download Diff File

2
cmd/tailscale/cli/netcheck.go
Unescape Escape View File

@ -53,7 +53,7 @@ func runNetcheck(ctx context.Context, args []string) error {
return err
}
c := &netcheck.Client{
PortMapper: portmapper.NewClient(logf, netMon, nil, nil),
PortMapper: portmapper.NewClient(logf, netMon, nil, nil, nil),
UseDNSCache: false, // always resolve, don't cache
}
if netcheckArgs.verbose {

1
cmd/tailscaled/tailscaled.go
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@ -607,6 +607,7 @@ func tryEngine(logf logger.Logf, sys *tsd.System, name string) (onlyNetstack boo
NetMon: sys.NetMon.Get(),
Dialer: sys.Dialer.Get(),
SetSubsystem: sys.Set,
ControlKnobs: sys.ControlKnobs(),
}
onlyNetstack = name == "userspace-networking"

1
cmd/tsconnect/wasm/wasm_js.go
Unescape Escape View File

@ -102,6 +102,7 @@ func newIPN(jsConfig js.Value) map[string]any {
eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
Dialer: dialer,
SetSubsystem: sys.Set,
ControlKnobs: sys.ControlKnobs(),
})
if err != nil {
log.Fatal(err)

55
control/controlclient/direct.go
Unescape Escape View File

@ -25,7 +25,6 @@ import (
"slices"
"strings"
"sync"
"sync/atomic"
"time"
"go4.org/mem"
@ -44,7 +43,6 @@ import (
"tailscale.com/net/tsdial"
"tailscale.com/net/tshttpproxy"
"tailscale.com/smallzstd"
"tailscale.com/syncs"
"tailscale.com/tailcfg"
"tailscale.com/tka"
"tailscale.com/tstime"
@ -66,6 +64,7 @@ type Direct struct {
httpc *http.Client // HTTP client used to talk to tailcontrol
dialer *tsdial.Dialer
dnsCache *dnscache.Resolver
controlKnobs *controlknobs.Knobs // always non-nil
serverURL string // URL of the tailcontrol server
clock tstime.Clock
lastPrintMap time.Time
@ -129,6 +128,7 @@ type Options struct {
OnControlTime func(time.Time) // optional func to notify callers of new time from control
Dialer *tsdial.Dialer // non-nil
C2NHandler http.Handler // or nil
ControlKnobs *controlknobs.Knobs // or nil to ignore
// Observer is called when there's a change in status to report
// from the control client.
@ -202,6 +202,9 @@ func NewDirect(opts Options) (*Direct, error) {
if opts.GetMachinePrivateKey == nil {
return nil, errors.New("controlclient.New: no GetMachinePrivateKey specified")
}
if opts.ControlKnobs == nil {
opts.ControlKnobs = &controlknobs.Knobs{}
}
opts.ServerURL = strings.TrimRight(opts.ServerURL, "/")
serverURL, err := url.Parse(opts.ServerURL)
if err != nil {
@ -249,6 +252,7 @@ func NewDirect(opts Options) (*Direct, error) {
c := &Direct{
httpc: httpc,
controlKnobs: opts.ControlKnobs,
getMachinePrivKey: opts.GetMachinePrivateKey,
serverURL: opts.ServerURL,
clock: opts.Clock,
@ -946,7 +950,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
var mapResIdx int // 0 for first message, then 1+ for deltas
sess := newMapSession(persist.PrivateNodeKey(), nu)
sess := newMapSession(persist.PrivateNodeKey(), nu, c.controlKnobs)
defer sess.Close()
sess.cancel = cancel
sess.logf = c.logf
@ -1287,38 +1291,11 @@ func initDevKnob() devKnobs {
var clock tstime.Clock = tstime.StdClock{}
// config from control.
var (
controlDisableDRPO atomic.Bool
controlKeepFullWGConfig atomic.Bool
controlRandomizeClientPort atomic.Bool
controlOneCGNAT syncs.AtomicValue[opt.Bool]
)
// DisableDRPO reports whether control says to disable the
// DERP route optimization (Issue 150).
func DisableDRPO() bool {
return controlDisableDRPO.Load()
}
// KeepFullWGConfig reports whether control says we should disable the lazy
// wireguard programming and instead give it the full netmap always.
func KeepFullWGConfig() bool {
return controlKeepFullWGConfig.Load()
}
// RandomizeClientPort reports whether control says we should randomize
// the client port.
func RandomizeClientPort() bool {
return controlRandomizeClientPort.Load()
}
// ControlOneCGNATSetting returns control's OneCGNAT setting, if any.
func ControlOneCGNATSetting() opt.Bool {
return controlOneCGNAT.Load()
func (ms *mapSession) setControlKnobsFromNodeAttrs(selfNodeAttrs []string) {
k := ms.controlKnobs
if k == nil {
return
}
func setControlKnobsFromNodeAttrs(selfNodeAttrs []string) {
var (
keepFullWG bool
disableDRPO bool
@ -1342,11 +1319,11 @@ func setControlKnobsFromNodeAttrs(selfNodeAttrs []string) {
oneCGNAT.Set(false)
}
}
controlKeepFullWGConfig.Store(keepFullWG)
controlDisableDRPO.Store(disableDRPO)
controlknobs.SetDisableUPnP(disableUPnP)
controlRandomizeClientPort.Store(randomizeClientPort)
controlOneCGNAT.Store(oneCGNAT)
k.KeepFullWGConfig.Store(keepFullWG)
k.DisableDRPO.Store(disableDRPO)
k.DisableUPnP.Store(disableUPnP)
k.RandomizeClientPort.Store(randomizeClientPort)
k.OneCGNAT.Store(oneCGNAT)
}
// ipForwardingBroken reports whether the system's IP forwarding is disabled

7
control/controlclient/map.go
Unescape Escape View File

@ -15,6 +15,7 @@ import (
"strconv"
"sync"
"tailscale.com/control/controlknobs"
"tailscale.com/envknob"
"tailscale.com/tailcfg"
"tailscale.com/tstime"
@ -39,6 +40,7 @@ import (
type mapSession struct {
// Immutable fields.
nu NetmapUpdater // called on changes (in addition to the optional hooks below)
controlKnobs *controlknobs.Knobs // or nil
privateNodeKey key.NodePrivate
publicNodeKey key.NodePublic
logf logger.Logf
@ -94,9 +96,10 @@ type mapSession struct {
// Modify its optional fields on the returned value before use.
//
// It must have its Close method called to release resources.
func newMapSession(privateNodeKey key.NodePrivate, nu NetmapUpdater) *mapSession {
func newMapSession(privateNodeKey key.NodePrivate, nu NetmapUpdater, controlKnobs *controlknobs.Knobs) *mapSession {
ms := &mapSession{
nu: nu,
controlKnobs: controlKnobs,
privateNodeKey: privateNodeKey,
publicNodeKey: privateNodeKey.Public(),
lastDNSConfig: new(tailcfg.DNSConfig),
@ -184,7 +187,7 @@ func (ms *mapSession) HandleNonKeepAliveMapResponse(ctx context.Context, resp *t
if DevKnob.StripCaps() {
resp.Node.Capabilities = nil
}
setControlKnobsFromNodeAttrs(resp.Node.Capabilities)
ms.setControlKnobsFromNodeAttrs(resp.Node.Capabilities)
}
// Call Node.InitDisplayNames on any changed nodes.

3
control/controlclient/map_test.go
Unescape Escape View File

@ -16,6 +16,7 @@ import (
"github.com/google/go-cmp/cmp"
"go4.org/mem"
"tailscale.com/control/controlknobs"
"tailscale.com/tailcfg"
"tailscale.com/tstest"
"tailscale.com/tstime"
@ -392,7 +393,7 @@ func formatNodes(nodes []*tailcfg.Node) string {
}
func newTestMapSession(t testing.TB, nu NetmapUpdater) *mapSession {
ms := newMapSession(key.NewNode(), nu)
ms := newMapSession(key.NewNode(), nu, new(controlknobs.Knobs))
t.Cleanup(ms.Close)
ms.logf = t.Logf
return ms

34
control/controlknobs/controlknobs.go
Unescape Escape View File

@ -8,22 +8,30 @@ package controlknobs
import (
"sync/atomic"
"tailscale.com/envknob"
"tailscale.com/syncs"
"tailscale.com/types/opt"
)
// disableUPnP indicates whether to attempt UPnP mapping.
var disableUPnPControl atomic.Bool
// Knobs is the set of knobs that the control plane's coordination server can
// adjust at runtime.
type Knobs struct {
// DisableUPnP indicates whether to attempt UPnP mapping.
DisableUPnP atomic.Bool
var disableUPnpEnv = envknob.RegisterBool("TS_DISABLE_UPNP")
// DisableDRPO is whether control says to disable the
// DERP route optimization (Issue 150).
DisableDRPO atomic.Bool
// DisableUPnP reports the last reported value from control
// whether UPnP portmapping should be disabled.
func DisableUPnP() bool {
return disableUPnPControl.Load() || disableUPnpEnv()
}
// KeepFullWGConfig is whether we should disable the lazy wireguard
// programming and instead give WireGuard the full netmap always, even for
// idle peers.
KeepFullWGConfig atomic.Bool
// RandomizeClientPort is whether control says we should randomize
// the client port.
RandomizeClientPort atomic.Bool
// SetDisableUPnP sets whether control says that UPnP should be
// disabled.
func SetDisableUPnP(v bool) {
disableUPnPControl.Store(v)
// OneCGNAT is whether the the node should make one big CGNAT route
// in the OS rather than one /32 per peer.
OneCGNAT syncs.AtomicValue[opt.Bool]
}

14
ipn/ipnlocal/local.go
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@ -34,6 +34,7 @@ import (
"gvisor.dev/gvisor/pkg/tcpip"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/control/controlclient"
"tailscale.com/control/controlknobs"
"tailscale.com/doctor"
"tailscale.com/doctor/permissions"
"tailscale.com/doctor/routetable"
@ -3084,7 +3085,7 @@ func (b *LocalBackend) authReconfig() {
return
}
oneCGNATRoute := shouldUseOneCGNATRoute(b.logf, version.OS())
oneCGNATRoute := shouldUseOneCGNATRoute(b.logf, b.sys.ControlKnobs(), version.OS())
rcfg := b.routerConfig(cfg, prefs, oneCGNATRoute)
dcfg := dnsConfigForNetmap(nm, prefs, b.logf, version.OS())
@ -3102,12 +3103,14 @@ func (b *LocalBackend) authReconfig() {
//
// The versionOS is a Tailscale-style version ("iOS", "macOS") and not
// a runtime.GOOS.
func shouldUseOneCGNATRoute(logf logger.Logf, versionOS string) bool {
func shouldUseOneCGNATRoute(logf logger.Logf, controlKnobs *controlknobs.Knobs, versionOS string) bool {
if controlKnobs != nil {
// Explicit enabling or disabling always take precedence.
if v, ok := controlclient.ControlOneCGNATSetting().Get(); ok {
if v, ok := controlKnobs.OneCGNAT.Load().Get(); ok {
logf("[v1] shouldUseOneCGNATRoute: explicit=%v", v)
return v
}
}
// Also prefer to do this on the Mac, so that we don't need to constantly
// update the network extension configuration (which is disruptive to
@ -4663,6 +4666,11 @@ func (b *LocalBackend) DebugReSTUN() error {
return nil
}
// ControlKnobs returns the node's control knobs.
func (b *LocalBackend) ControlKnobs() *controlknobs.Knobs {
return b.sys.ControlKnobs()
}
func (b *LocalBackend) magicConn() (*magicsock.Conn, error) {
mc, ok := b.sys.MagicSock.GetOK()
if !ok {

2
ipn/localapi/localapi.go
Unescape Escape View File

@ -694,7 +694,7 @@ func (h *Handler) serveDebugPortmap(w http.ResponseWriter, r *http.Request) {
done := make(chan bool, 1)
var c *portmapper.Client
c = portmapper.NewClient(logger.WithPrefix(logf, "portmapper: "), h.netMon, debugKnobs, func() {
c = portmapper.NewClient(logger.WithPrefix(logf, "portmapper: "), h.netMon, debugKnobs, h.b.ControlKnobs(), func() {
logf("portmapping changed.")
logf("have mapping: %v", c.HaveMapping())

3
net/portmapper/igd_test.go
Unescape Escape View File

@ -14,6 +14,7 @@ import (
"sync/atomic"
"testing"
"tailscale.com/control/controlknobs"
"tailscale.com/net/netaddr"
"tailscale.com/types/logger"
)
@ -249,7 +250,7 @@ func (d *TestIGD) handlePCPQuery(pkt []byte, src netip.AddrPort) {
func newTestClient(t *testing.T, igd *TestIGD) *Client {
var c *Client
c = NewClient(t.Logf, nil, nil, func() {
c = NewClient(t.Logf, nil, nil, new(controlknobs.Knobs), func() {
t.Logf("port map changed")
t.Logf("have mapping: %v", c.HaveMapping())
})

14
net/portmapper/portmapper.go
Unescape Escape View File

@ -18,6 +18,7 @@ import (
"time"
"go4.org/mem"
"tailscale.com/control/controlknobs"
"tailscale.com/net/interfaces"
"tailscale.com/net/netaddr"
"tailscale.com/net/neterror"
@ -66,6 +67,7 @@ const trustServiceStillAvailableDuration = 10 * time.Minute
type Client struct {
logf logger.Logf
netMon *netmon.Monitor // optional; nil means interfaces will be looked up on-demand
controlKnobs *controlknobs.Knobs
ipAndGateway func() (gw, ip netip.Addr, ok bool)
onChange func() // or nil
debug DebugKnobs
@ -166,15 +168,19 @@ func (m *pmpMapping) Release(ctx context.Context) {
// The debug argument allows configuring the behaviour of the portmapper for
// debugging; if nil, a sensible set of defaults will be used.
//
// The optional onChange argument specifies a func to run in a new
// goroutine whenever the port mapping status has changed. If nil,
// it doesn't make a callback.
func NewClient(logf logger.Logf, netMon *netmon.Monitor, debug *DebugKnobs, onChange func()) *Client {
// The controlKnobs, if non-nil, specifies the control knobs from the control
// plane that might disable portmapping.
//
// The optional onChange argument specifies a func to run in a new goroutine
// whenever the port mapping status has changed. If nil, it doesn't make a
// callback.
func NewClient(logf logger.Logf, netMon *netmon.Monitor, debug *DebugKnobs, controlKnobs *controlknobs.Knobs, onChange func()) *Client {
ret := &Client{
logf: logf,
netMon: netMon,
ipAndGateway: interfaces.LikelyHomeRouterIP,
onChange: onChange,
controlKnobs: controlKnobs,
}
if debug != nil {
ret.debug = *debug

8
net/portmapper/portmapper_test.go
Unescape Escape View File

@ -10,13 +10,15 @@ import (
"strconv"
"testing"
"time"
"tailscale.com/control/controlknobs"
)
func TestCreateOrGetMapping(t *testing.T) {
if v, _ := strconv.ParseBool(os.Getenv("HIT_NETWORK")); !v {
t.Skip("skipping test without HIT_NETWORK=1")
}
c := NewClient(t.Logf, nil, nil, nil)
c := NewClient(t.Logf, nil, nil, new(controlknobs.Knobs), nil)
defer c.Close()
c.SetLocalPort(1234)
for i := 0; i < 2; i++ {
@ -32,7 +34,7 @@ func TestClientProbe(t *testing.T) {
if v, _ := strconv.ParseBool(os.Getenv("HIT_NETWORK")); !v {
t.Skip("skipping test without HIT_NETWORK=1")
}
c := NewClient(t.Logf, nil, nil, nil)
c := NewClient(t.Logf, nil, nil, new(controlknobs.Knobs), nil)
defer c.Close()
for i := 0; i < 3; i++ {
if i > 0 {
@ -47,7 +49,7 @@ func TestClientProbeThenMap(t *testing.T) {
if v, _ := strconv.ParseBool(os.Getenv("HIT_NETWORK")); !v {
t.Skip("skipping test without HIT_NETWORK=1")
}
c := NewClient(t.Logf, nil, nil, nil)
c := NewClient(t.Logf, nil, nil, new(controlknobs.Knobs), nil)
defer c.Close()
c.SetLocalPort(1234)
res, err := c.Probe(context.Background())

10
net/portmapper/upnp.go
Unescape Escape View File

@ -24,7 +24,7 @@ import (
"github.com/tailscale/goupnp"
"github.com/tailscale/goupnp/dcps/internetgateway2"
"tailscale.com/control/controlknobs"
"tailscale.com/envknob"
"tailscale.com/net/netns"
"tailscale.com/types/logger"
)
@ -192,7 +192,7 @@ func addAnyPortMapping(
// The provided ctx is not retained in the returned upnpClient, but
// its associated HTTP client is (if set via goupnp.WithHTTPClient).
func getUPnPClient(ctx context.Context, logf logger.Logf, debug DebugKnobs, gw netip.Addr, meta uPnPDiscoResponse) (client upnpClient, err error) {
if controlknobs.DisableUPnP() || debug.DisableUPnP {
if debug.DisableUPnP {
return nil, nil
}
@ -270,6 +270,10 @@ func (c *Client) upnpHTTPClientLocked() *http.Client {
return c.uPnPHTTPClient
}
var (
disableUPnpEnv = envknob.RegisterBool("TS_DISABLE_UPNP")
)
// getUPnPPortMapping attempts to create a port-mapping over the UPnP protocol. On success,
// it will return the externally exposed IP and port. Otherwise, it will return a zeroed IP and
// port and an error.
@ -279,7 +283,7 @@ func (c *Client) getUPnPPortMapping(
internal netip.AddrPort,
prevPort uint16,
) (external netip.AddrPort, ok bool) {
if controlknobs.DisableUPnP() || c.debug.DisableUPnP {
if disableUPnpEnv() || c.debug.DisableUPnP || (c.controlKnobs != nil && c.controlKnobs.DisableUPnP.Load()) {
return netip.AddrPort{}, false
}

7
tsd/tsd.go
Unescape Escape View File

@ -21,6 +21,7 @@ import (
"fmt"
"reflect"
"tailscale.com/control/controlknobs"
"tailscale.com/ipn"
"tailscale.com/net/dns"
"tailscale.com/net/netmon"
@ -42,6 +43,7 @@ type System struct {
Router SubSystem[router.Router]
Tun SubSystem[*tstun.Wrapper]
StateStore SubSystem[ipn.StateStore]
controlKnobs controlknobs.Knobs
}
// Set is a convenience method to set a subsystem value.
@ -85,6 +87,11 @@ func (s *System) IsNetstack() bool {
return name == tstun.FakeTUNName
}
// ControlKnobs returns the control knobs for this node.
func (s *System) ControlKnobs() *controlknobs.Knobs {
return &s.controlKnobs
}
// SubSystem represents some subsystem of the Tailscale node daemon.
//
// A subsystem can be set to a value, and then later retrieved. A subsystem

1
tsnet/tsnet.go
Unescape Escape View File

@ -501,6 +501,7 @@ func (s *Server) start() (reterr error) {
NetMon: s.netMon,
Dialer: s.dialer,
SetSubsystem: sys.Set,
ControlKnobs: sys.ControlKnobs(),
})
if err != nil {
return err

7
wgengine/magicsock/derp.go
Unescape Escape View File

@ -18,7 +18,6 @@ import (
"time"
"github.com/tailscale/wireguard-go/conn"
"tailscale.com/control/controlclient"
"tailscale.com/derp"
"tailscale.com/derp/derphttp"
"tailscale.com/health"
@ -38,11 +37,11 @@ import (
//
// By default it's enabled, unless an environment variable
// or control says to disable it.
func useDerpRoute() bool {
func (c *Conn) useDerpRoute() bool {
if b, ok := debugUseDerpRoute().Get(); ok {
return b
}
return !controlclient.DisableDRPO()
return c.controlKnobs == nil || !c.controlKnobs.DisableDRPO.Load()
}
// derpRoute is a route entry for a public key, saying that a certain
@ -294,7 +293,7 @@ func (c *Conn) derpWriteChanOfAddr(addr netip.AddrPort, peer key.NodePublic) cha
// perhaps peer's home is Frankfurt, but they dialed our home DERP
// node in SF to reach us, so we can reply to them using our
// SF connection rather than dialing Frankfurt. (Issue 150)
if !peer.IsZero() && useDerpRoute() {
if !peer.IsZero() && c.useDerpRoute() {
if r, ok := c.derpRoute[peer]; ok {
if ad, ok := c.activeDerp[r.derpID]; ok && ad.c == r.dc {
c.setPeerLastDerpLocked(peer, r.derpID, regionID)

9
wgengine/magicsock/magicsock.go
Unescape Escape View File

@ -25,6 +25,7 @@ import (
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
"tailscale.com/control/controlknobs"
"tailscale.com/disco"
"tailscale.com/envknob"
"tailscale.com/health"
@ -87,6 +88,7 @@ type Conn struct {
testOnlyPacketListener nettype.PacketListener
noteRecvActivity func(key.NodePublic) // or nil, see Options.NoteRecvActivity
netMon *netmon.Monitor // or nil
controlKnobs *controlknobs.Knobs // or nil
// ================================================================
// No locking required to access these fields, either because
@ -340,6 +342,10 @@ type Options struct {
// NetMon is the network monitor to use.
// With one, the portmapper won't be used.
NetMon *netmon.Monitor
// ControlKnobs are the set of control knobs to use.
// If nil, they're ignored and not updated.
ControlKnobs *controlknobs.Knobs
}
func (o *Options) logf() logger.Logf {
@ -400,13 +406,14 @@ func newConn() *Conn {
func NewConn(opts Options) (*Conn, error) {
c := newConn()
c.port.Store(uint32(opts.Port))
c.controlKnobs = opts.ControlKnobs
c.logf = opts.logf()
c.epFunc = opts.endpointsFunc()
c.derpActiveFunc = opts.derpActiveFunc()
c.idleFunc = opts.IdleFunc
c.testOnlyPacketListener = opts.TestOnlyPacketListener
c.noteRecvActivity = opts.NoteRecvActivity
c.portMapper = portmapper.NewClient(logger.WithPrefix(c.logf, "portmapper: "), opts.NetMon, nil, c.onPortMapChanged)
c.portMapper = portmapper.NewClient(logger.WithPrefix(c.logf, "portmapper: "), opts.NetMon, nil, opts.ControlKnobs, c.onPortMapChanged)
if opts.NetMon != nil {
c.portMapper.SetGatewayLookupFunc(opts.NetMon.GatewayAndSelfIP)
}

26
wgengine/userspace.go
Unescape Escape View File

@ -19,7 +19,7 @@ import (
"github.com/tailscale/wireguard-go/device"
"github.com/tailscale/wireguard-go/tun"
"tailscale.com/control/controlclient"
"tailscale.com/control/controlknobs"
"tailscale.com/envknob"
"tailscale.com/health"
"tailscale.com/ipn/ipnstate"
@ -98,6 +98,7 @@ type userspaceEngine struct {
netMonOwned bool // whether we created netMon (and thus need to close it)
netMonUnregister func() // unsubscribes from changes; used regardless of netMonOwned
birdClient BIRDClient // or nil
controlKnobs *controlknobs.Knobs // or nil
testMaybeReconfigHook func() // for tests; if non-nil, fires if maybeReconfigWireguardLocked called
@ -183,6 +184,11 @@ type Config struct {
// If nil, a new Dialer is created
Dialer *tsdial.Dialer
// ControlKnobs is the set of control plane-provied knobs
// to use.
// If nil, defaults are used.
ControlKnobs *controlknobs.Knobs
// ListenPort is the port on which the engine will listen.
// If zero, a port is automatically selected.
ListenPort uint16
@ -220,6 +226,8 @@ func NewFakeUserspaceEngine(logf logger.Logf, opts ...any) (Engine, error) {
conf.ListenPort = uint16(v)
case func(any):
conf.SetSubsystem = v
case *controlknobs.Knobs:
conf.ControlKnobs = v
default:
return nil, fmt.Errorf("unknown option type %T", v)
}
@ -271,6 +279,7 @@ func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error)
router: conf.Router,
confListenPort: conf.ListenPort,
birdClient: conf.BIRDClient,
controlKnobs: conf.ControlKnobs,
}
if e.birdClient != nil {
@ -326,6 +335,7 @@ func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error)
IdleFunc: e.tundev.IdleDuration,
NoteRecvActivity: e.noteRecvActivity,
NetMon: e.netMon,
ControlKnobs: conf.ControlKnobs,
}
var err error
@ -493,12 +503,12 @@ var debugTrimWireguard = envknob.RegisterOptBool("TS_DEBUG_TRIM_WIREGUARD")
// That's sad too. Or we get rid of these knobs (lazy wireguard config has been
// stable!) but I'm worried that a future regression would be easier to debug
// with these knobs in place.
func forceFullWireguardConfig(numPeers int) bool {
func (e *userspaceEngine) forceFullWireguardConfig(numPeers int) bool {
// Did the user explicitly enable trimming via the environment variable knob?
if b, ok := debugTrimWireguard().Get(); ok {
return !b
}
return controlclient.KeepFullWGConfig()
return e.controlKnobs != nil && e.controlKnobs.KeepFullWGConfig.Load()
}
// isTrimmablePeer reports whether p is a peer that we can trim out of the
@ -508,8 +518,8 @@ func forceFullWireguardConfig(numPeers int) bool {
// only non-subnet AllowedIPs (an IPv4 /32 or IPv6 /128), which is the
// common case for most peers. Subnet router nodes will just always be
// created in the wireguard-go config.
func isTrimmablePeer(p *wgcfg.Peer, numPeers int) bool {
if forceFullWireguardConfig(numPeers) {
func (e *userspaceEngine) isTrimmablePeer(p *wgcfg.Peer, numPeers int) bool {
if e.forceFullWireguardConfig(numPeers) {
return false
}
@ -625,7 +635,7 @@ func (e *userspaceEngine) maybeReconfigWireguardLocked(discoChanged map[key.Node
for i := range full.Peers {
p := &full.Peers[i]
nk := p.PublicKey
if !isTrimmablePeer(p, len(full.Peers)) {
if !e.isTrimmablePeer(p, len(full.Peers)) {
min.Peers = append(min.Peers, *p)
if discoChanged[nk] {
needRemoveStep = true
@ -766,8 +776,6 @@ func hasOverlap(aips, rips views.Slice[netip.Prefix]) bool {
return false
}
var randomizeClientPort = controlclient.RandomizeClientPort
func (e *userspaceEngine) Reconfig(cfg *wgcfg.Config, routerCfg *router.Config, dnsCfg *dns.Config) error {
if routerCfg == nil {
panic("routerCfg must not be nil")
@ -794,7 +802,7 @@ func (e *userspaceEngine) Reconfig(cfg *wgcfg.Config, routerCfg *router.Config,
e.mu.Unlock()
listenPort := e.confListenPort
if randomizeClientPort() {
if e.controlKnobs != nil && e.controlKnobs.RandomizeClientPort.Load() {
listenPort = 0
}

12
wgengine/userspace_test.go
Unescape Escape View File

@ -11,6 +11,7 @@ import (
"go4.org/mem"
"tailscale.com/cmd/testwrapper/flakytest"
"tailscale.com/control/controlknobs"
"tailscale.com/net/dns"
"tailscale.com/net/netaddr"
"tailscale.com/net/tstun"
@ -152,15 +153,16 @@ func TestUserspaceEngineReconfig(t *testing.T) {
}
func TestUserspaceEnginePortReconfig(t *testing.T) {
tstest.Replace(t, &randomizeClientPort, func() bool { return false })
flakytest.Mark(t, "https://github.com/tailscale/tailscale/issues/2855")
const defaultPort = 49983
var knobs controlknobs.Knobs
// Keep making a wgengine until we find an unused port
var ue *userspaceEngine
for i := 0; i < 100; i++ {
attempt := uint16(defaultPort + i)
e, err := NewFakeUserspaceEngine(t.Logf, attempt)
e, err := NewFakeUserspaceEngine(t.Logf, attempt, &knobs)
if err != nil {
t.Fatal(err)
}
@ -199,7 +201,7 @@ func TestUserspaceEnginePortReconfig(t *testing.T) {
t.Errorf("no debug setting changed local port to %d from %d", got, startingPort)
}
randomizeClientPort = func() bool { return true }
knobs.RandomizeClientPort.Store(true)
if err := ue.Reconfig(cfg, routerCfg, &dns.Config{}); err != nil {
t.Fatal(err)
}
@ -208,7 +210,7 @@ func TestUserspaceEnginePortReconfig(t *testing.T) {
}
lastPort := ue.magicConn.LocalPort()
randomizeClientPort = func() bool { return false }
knobs.RandomizeClientPort.Store(false)
if err := ue.Reconfig(cfg, routerCfg, &dns.Config{}); err != nil {
t.Fatal(err)
}

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