update DNAT routing rules

Signed-off-by: Maisem Ali <maisem@tailscale.com>

.github/workflows/docker-file-build.yml.disabled

@@ -1,15 +0,0 @@
-name: "Dockerfile build"
-on: 
-  push:
-    branches:
-    - main
-  pull_request:
-    branches:
-      - "*"
-jobs:
-  deploy:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v3
-    - name: "Build Docker image"
-      run: docker build .

.github/workflows/golangci-lint.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: golangci-lint
         # Note: this is the 'v3' tag as of 2023-04-17
-        uses: golangci/golangci-lint-action@639cd343e1d3b897ff35927a75193d57cfcba299
+        uses: golangci/golangci-lint-action@08e2f20817b15149a52b5b3ebe7de50aff2ba8c5
         with:
           version: v1.52.2
 

.github/workflows/test.yml

@@ -90,11 +90,11 @@ jobs:
     - name: build test wrapper
       run: ./tool/go build -o /tmp/testwrapper ./cmd/testwrapper
     - name: test all
-      run: PATH=$PWD/tool:$PATH /tmp/testwrapper ./... ${{matrix.buildflags}}
+      run: ./tool/go test ${{matrix.buildflags}} -exec=/tmp/testwrapper
       env:
         GOARCH: ${{ matrix.goarch }}
     - name: bench all
-      run: PATH=$PWD/tool:$PATH /tmp/testwrapper ./... ${{matrix.buildflags}} -bench=. -benchtime=1x -run=^$ 
+      run: ./tool/go test ${{matrix.buildflags}} -exec=/tmp/testwrapper -test.bench=. -test.benchtime=1x -test.run=^$
       env:
         GOARCH: ${{ matrix.goarch }}
     - name: check that no tracked files changed

Dockerfile

@@ -47,7 +47,8 @@ RUN go install \
     golang.org/x/crypto/ssh \
     golang.org/x/crypto/acme \
     nhooyr.io/websocket \
-    github.com/mdlayher/netlink
+    github.com/mdlayher/netlink \
+    golang.zx2c4.com/wireguard/device
 
 COPY . .
 
@@ -72,4 +73,4 @@ RUN apk add --no-cache ca-certificates iptables iproute2 ip6tables
 COPY --from=build-env /go/bin/* /usr/local/bin/
 # For compat with the previous run.sh, although ideally you should be
 # using build_docker.sh which sets an entrypoint for the image.
-RUN mkdir /tailscale && ln -s /usr/local/bin/containerboot /tailscale/run.sh
+RUN ln -s /usr/local/bin/containerboot /tailscale/run.sh

Dockerfile.base

@@ -2,4 +2,4 @@
 # SPDX-License-Identifier: BSD-3-Clause
 
 FROM alpine:3.16
-RUN apk add --no-cache ca-certificates iptables iproute2 ip6tables iputils
+RUN apk add --no-cache ca-certificates iptables iproute2 ip6tables

VERSION.txt

@@ -1 +1 @@
-1.45.0
+1.43.0

api.md

@@ -101,8 +101,8 @@ You can also [list all devices in the tailnet](#list-tailnet-devices) to get the
 ``` jsonc
 {
   // addresses (array of strings) is a list of Tailscale IP
-  // addresses for the device, including both IPv4 (formatted as 100.x.y.z)
-  // and IPv6 (formatted as fd7a:115c:a1e0:a:b:c:d:e) addresses.
+  // addresses for the device, including both ipv4 (formatted as 100.x.y.z)
+  // and ipv6 (formatted as fd7a:115c:a1e0:a:b:c:d:e) addresses.
   "addresses": [
     "100.87.74.78",
     "fd7a:115c:a1e0:ac82:4843:ca90:697d:c36e"
@@ -1222,11 +1222,6 @@ The remaining three methods operate on auth keys and API access tokens.
 
   // expirySeconds (int) is the duration in seconds a new key is valid.
   "expirySeconds": 86400
-
-  // description (string) is an optional short phrase that describes what
-  // this key is used for. It can be a maximum of 50 alphanumeric characters.
-  // Hyphens and underscores are also allowed.
-  "description": "short description of key purpose"
 }
 ```
 
@@ -1313,9 +1308,6 @@ Note the following about required vs. optional values:
   Specifies the duration in seconds until the key should expire.
   Defaults to 90 days if not supplied.
 
-- **`description`:** Optional in `POST` body.
-  A short string specifying the purpose of the key. Can be a maximum of 50 alphanumeric characters. Hyphens and spaces are also allowed.
-
 ### Request example
 
 ``` jsonc
@@ -1333,8 +1325,7 @@ curl "https://api.tailscale.com/api/v2/tailnet/example.com/keys" \
       }
     }
   },
-  "expirySeconds": 86400,
-  "description": "dev access"
+  "expirySeconds": 86400
 }'
 ```
 
@@ -1360,8 +1351,7 @@ It holds the capabilities specified in the request and can no longer be retrieve
         "tags": [ "tag:example" ]
       }
     }
-  },
-  "description": "dev access"
+  }
 }
 ```
 
@@ -1413,8 +1403,7 @@ The response is a JSON object with information about the key supplied.
         ]
       }
     }
-  },
-  "description": "dev access"
+  }
 }
 ```
 

client/tailscale/localclient.go

@@ -946,21 +946,6 @@ func (lc *LocalClient) NetworkLockForceLocalDisable(ctx context.Context) error {
 	return nil
 }
 
-// NetworkLockVerifySigningDeeplink verifies the network lock deeplink contained
-// in url and returns information extracted from it.
-func (lc *LocalClient) NetworkLockVerifySigningDeeplink(ctx context.Context, url string) (*tka.DeeplinkValidationResult, error) {
-	vr := struct {
-		URL string
-	}{url}
-
-	body, err := lc.send(ctx, "POST", "/localapi/v0/tka/verify-deeplink", 200, jsonBody(vr))
-	if err != nil {
-		return nil, fmt.Errorf("sending verify-deeplink: %w", err)
-	}
-
-	return decodeJSON[*tka.DeeplinkValidationResult](body)
-}
-
 // SetServeConfig sets or replaces the serving settings.
 // If config is nil, settings are cleared and serving is disabled.
 func (lc *LocalClient) SetServeConfig(ctx context.Context, config *ipn.ServeConfig) error {

cmd/containerboot/main.go

@@ -16,6 +16,8 @@
 //   - TS_ROUTES: subnet routes to advertise.
 //   - TS_DEST_IP: proxy all incoming Tailscale traffic to the given
 //     destination.
+//   - TS_EGRESS_IP: proxy all incoming non-Tailscale traffic to the given
+//     destination.
 //   - TS_TAILSCALED_EXTRA_ARGS: extra arguments to 'tailscaled'.
 //   - TS_EXTRA_ARGS: extra arguments to 'tailscale up'.
 //   - TS_USERSPACE: run with userspace networking (the default)
@@ -76,7 +78,8 @@ func main() {
 		AuthKey:         defaultEnvs([]string{"TS_AUTHKEY", "TS_AUTH_KEY"}, ""),
 		Hostname:        defaultEnv("TS_HOSTNAME", ""),
 		Routes:          defaultEnv("TS_ROUTES", ""),
-		ProxyTo:         defaultEnv("TS_DEST_IP", ""),
+		IngressProxyTo:  defaultEnv("TS_DEST_IP", ""),
+		EgressProxyTo:   defaultEnv("TS_EGRESS_IP", ""),
 		DaemonExtraArgs: defaultEnv("TS_TAILSCALED_EXTRA_ARGS", ""),
 		ExtraArgs:       defaultEnv("TS_EXTRA_ARGS", ""),
 		InKubernetes:    os.Getenv("KUBERNETES_SERVICE_HOST") != "",
@@ -91,7 +94,7 @@ func main() {
 		Root:            defaultEnv("TS_TEST_ONLY_ROOT", "/"),
 	}
 
-	if cfg.ProxyTo != "" && cfg.UserspaceMode {
+	if cfg.IngressProxyTo != "" && cfg.UserspaceMode {
 		log.Fatal("TS_DEST_IP is not supported with TS_USERSPACE")
 	}
 
@@ -99,8 +102,8 @@ func main() {
 		if err := ensureTunFile(cfg.Root); err != nil {
 			log.Fatalf("Unable to create tuntap device file: %v", err)
 		}
-		if cfg.ProxyTo != "" || cfg.Routes != "" {
-			if err := ensureIPForwarding(cfg.Root, cfg.ProxyTo, cfg.Routes); err != nil {
+		if cfg.IngressProxyTo != "" || cfg.Routes != "" {
+			if err := ensureIPForwarding(cfg.Root, cfg.IngressProxyTo, cfg.Routes); err != nil {
 				log.Printf("Failed to enable IP forwarding: %v", err)
 				log.Printf("To run tailscale as a proxy or router container, IP forwarding must be enabled.")
 				if cfg.InKubernetes {
@@ -240,11 +243,13 @@ authLoop:
 	}
 
 	var (
-		wantProxy         = cfg.ProxyTo != ""
+		wantProxy         = cfg.IngressProxyTo != "" || cfg.EgressProxyTo != ""
 		wantDeviceInfo    = cfg.InKubernetes && cfg.KubeSecret != "" && cfg.KubernetesCanPatch
 		startupTasksDone  = false
 		currentIPs        deephash.Sum // tailscale IPs assigned to device
 		currentDeviceInfo deephash.Sum // device ID and fqdn
+
+		installedEgressProxy = false
 	)
 	for {
 		n, err := w.Next()
@@ -261,11 +266,17 @@ authLoop:
 			log.Fatalf("tailscaled left running state (now in state %q), exiting", *n.State)
 		}
 		if n.NetMap != nil {
-			if cfg.ProxyTo != "" && len(n.NetMap.Addresses) > 0 && deephash.Update(&currentIPs, &n.NetMap.Addresses) {
-				if err := installIPTablesRule(ctx, cfg.ProxyTo, n.NetMap.Addresses); err != nil {
+			if cfg.IngressProxyTo != "" && len(n.NetMap.Addresses) > 0 && deephash.Update(&currentIPs, &n.NetMap.Addresses) {
+				if err := installIngressForwardingRule(ctx, cfg.IngressProxyTo, n.NetMap.Addresses); err != nil {
 					log.Fatalf("installing proxy rules: %v", err)
 				}
 			}
+			if cfg.EgressProxyTo != "" && !installedEgressProxy {
+				if err := installEgressForwardingRule(ctx, cfg.EgressProxyTo); err != nil {
+					log.Fatalf("installing proxy rules: %v", err)
+				}
+				installedEgressProxy = true
+			}
 			deviceInfo := []any{n.NetMap.SelfNode.StableID, n.NetMap.SelfNode.Name}
 			if cfg.InKubernetes && cfg.KubernetesCanPatch && cfg.KubeSecret != "" && deephash.Update(&currentDeviceInfo, &deviceInfo) {
 				if err := storeDeviceInfo(ctx, cfg.KubeSecret, n.NetMap.SelfNode.StableID, n.NetMap.SelfNode.Name); err != nil {
@@ -492,7 +503,28 @@ func ensureIPForwarding(root, proxyTo, routes string) error {
 	return nil
 }
 
-func installIPTablesRule(ctx context.Context, dstStr string, tsIPs []netip.Prefix) error {
+func installEgressForwardingRule(ctx context.Context, dstStr string) error {
+	dst, err := netip.ParseAddr(dstStr)
+	if err != nil {
+		return err
+	}
+	argv0 := "iptables"
+	if dst.Is6() {
+		argv0 = "ip6tables"
+	}
+	// Technically, if the control server ever changes the IPs assigned to this
+	// node, we'll slowly accumulate iptables rules. This shouldn't happen, so
+	// for now we'll live with it.
+	cmd := exec.CommandContext(ctx, argv0, "-t", "nat", "-I", "PREROUTING", "1", "!", "-i", "tailscale0", "-j", "DNAT", "--to-destination", dstStr)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("executing iptables failed: %w", err)
+	}
+	return nil
+}
+
+func installIngressForwardingRule(ctx context.Context, dstStr string, tsIPs []netip.Prefix) error {
 	dst, err := netip.ParseAddr(dstStr)
 	if err != nil {
 		return err
@@ -529,10 +561,20 @@ func installIPTablesRule(ctx context.Context, dstStr string, tsIPs []netip.Prefi
 
 // settings is all the configuration for containerboot.
 type settings struct {
-	AuthKey            string
-	Hostname           string
-	Routes             string
-	ProxyTo            string
+	AuthKey  string
+	Hostname string
+	Routes   string
+
+	// IngressProxyTo is the destination IP to which all incoming
+	// Tailscale traffic should be proxied. If empty, no proxying
+	// is done. This is typically a locally reachable IP.
+	IngressProxyTo string
+
+	// EgressProxyTo is the destination IP to which all incoming
+	// non-Tailscale traffic should be proxied. If empty, no
+	// proxying is done. This is typically a Tailscale IP.
+	EgressProxyTo string
+
 	DaemonExtraArgs    string
 	ExtraArgs          string
 	InKubernetes       bool

cmd/derper/cert.go

@@ -72,7 +72,7 @@ func NewManualCertManager(certdir, hostname string) (certProvider, error) {
 		return nil, fmt.Errorf("can not load cert: %w", err)
 	}
 	if err := x509Cert.VerifyHostname(hostname); err != nil {
-		// return nil, fmt.Errorf("cert invalid for hostname %q: %w", hostname, err)
+		return nil, fmt.Errorf("cert invalid for hostname %q: %w", hostname, err)
 	}
 	return &manualCertManager{cert: &cert, hostname: hostname}, nil
 }
@@ -89,7 +89,7 @@ func (m *manualCertManager) TLSConfig() *tls.Config {
 
 func (m *manualCertManager) getCertificate(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
 	if hi.ServerName != m.hostname {
-		//return nil, fmt.Errorf("cert mismatch with hostname: %q", hi.ServerName)
+		return nil, fmt.Errorf("cert mismatch with hostname: %q", hi.ServerName)
 	}
 
 	// Return a shallow copy of the cert so the caller can append to its

cmd/derper/depaware.txt

@@ -12,16 +12,9 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
    W 💣 github.com/alexbrainman/sspi/negotiate                       from tailscale.com/net/tshttpproxy
         github.com/beorn7/perks/quantile                             from github.com/prometheus/client_golang/prometheus
      💣 github.com/cespare/xxhash/v2                                 from github.com/prometheus/client_golang/prometheus
-   L    github.com/coreos/go-iptables/iptables                       from tailscale.com/util/linuxfw
         github.com/fxamacker/cbor/v2                                 from tailscale.com/tka
         github.com/golang/groupcache/lru                             from tailscale.com/net/dnscache
         github.com/golang/protobuf/proto                             from github.com/matttproud/golang_protobuf_extensions/pbutil+
-   L    github.com/google/nftables                                   from tailscale.com/util/linuxfw
-   L 💣 github.com/google/nftables/alignedbuff                       from github.com/google/nftables/xt
-   L 💣 github.com/google/nftables/binaryutil                        from github.com/google/nftables+
-   L    github.com/google/nftables/expr                              from github.com/google/nftables+
-   L    github.com/google/nftables/internal/parseexprfunc            from github.com/google/nftables+
-   L    github.com/google/nftables/xt                                from github.com/google/nftables/expr+
         github.com/hdevalence/ed25519consensus                       from tailscale.com/tka
    L    github.com/josharian/native                                  from github.com/mdlayher/netlink+
    L 💣 github.com/jsimonetti/rtnetlink                              from tailscale.com/net/interfaces+
@@ -30,7 +23,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         github.com/matttproud/golang_protobuf_extensions/pbutil      from github.com/prometheus/common/expfmt
    L 💣 github.com/mdlayher/netlink                                  from github.com/jsimonetti/rtnetlink+
    L 💣 github.com/mdlayher/netlink/nlenc                            from github.com/jsimonetti/rtnetlink+
-   L    github.com/mdlayher/netlink/nltest                           from github.com/google/nftables
    L 💣 github.com/mdlayher/socket                                   from github.com/mdlayher/netlink
      💣 github.com/mitchellh/go-ps                                   from tailscale.com/safesocket
      💣 github.com/prometheus/client_golang/prometheus               from tailscale.com/tsweb/promvarz
@@ -42,9 +34,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
   LD    github.com/prometheus/procfs                                 from github.com/prometheus/client_golang/prometheus
   LD    github.com/prometheus/procfs/internal/fs                     from github.com/prometheus/procfs
   LD    github.com/prometheus/procfs/internal/util                   from github.com/prometheus/procfs
-   L 💣 github.com/tailscale/netlink                                 from tailscale.com/util/linuxfw
-   L 💣 github.com/vishvananda/netlink/nl                            from github.com/tailscale/netlink
-   L    github.com/vishvananda/netns                                 from github.com/tailscale/netlink+
         github.com/x448/float16                                      from github.com/fxamacker/cbor/v2
      💣 go4.org/mem                                                  from tailscale.com/client/tailscale+
         go4.org/netipx                                               from tailscale.com/wgengine/filter
@@ -77,20 +66,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         google.golang.org/protobuf/runtime/protoimpl                 from github.com/golang/protobuf/proto+
         google.golang.org/protobuf/types/descriptorpb                from google.golang.org/protobuf/reflect/protodesc
         google.golang.org/protobuf/types/known/timestamppb           from github.com/prometheus/client_golang/prometheus+
-   L    gvisor.dev/gvisor/pkg/abi                                    from gvisor.dev/gvisor/pkg/abi/linux
-   L 💣 gvisor.dev/gvisor/pkg/abi/linux                              from tailscale.com/util/linuxfw
-   L    gvisor.dev/gvisor/pkg/bits                                   from gvisor.dev/gvisor/pkg/abi/linux
-   L    gvisor.dev/gvisor/pkg/context                                from gvisor.dev/gvisor/pkg/abi/linux
-   L 💣 gvisor.dev/gvisor/pkg/gohacks                                from gvisor.dev/gvisor/pkg/abi/linux+
-   L 💣 gvisor.dev/gvisor/pkg/hostarch                               from gvisor.dev/gvisor/pkg/abi/linux+
-   L    gvisor.dev/gvisor/pkg/linewriter                             from gvisor.dev/gvisor/pkg/log
-   L    gvisor.dev/gvisor/pkg/log                                    from gvisor.dev/gvisor/pkg/context
-   L    gvisor.dev/gvisor/pkg/marshal                                from gvisor.dev/gvisor/pkg/abi/linux+
-   L 💣 gvisor.dev/gvisor/pkg/marshal/primitive                      from gvisor.dev/gvisor/pkg/abi/linux
-   L 💣 gvisor.dev/gvisor/pkg/state                                  from gvisor.dev/gvisor/pkg/abi/linux+
-   L    gvisor.dev/gvisor/pkg/state/wire                             from gvisor.dev/gvisor/pkg/state
-   L 💣 gvisor.dev/gvisor/pkg/sync                                   from gvisor.dev/gvisor/pkg/linewriter+
-   L    gvisor.dev/gvisor/pkg/waiter                                 from gvisor.dev/gvisor/pkg/context
         nhooyr.io/websocket                                          from tailscale.com/cmd/derper+
         nhooyr.io/websocket/internal/errd                            from nhooyr.io/websocket
         nhooyr.io/websocket/internal/xsync                           from nhooyr.io/websocket
@@ -118,7 +93,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         tailscale.com/net/packet                                     from tailscale.com/wgengine/filter
         tailscale.com/net/sockstats                                  from tailscale.com/derp/derphttp
         tailscale.com/net/stun                                       from tailscale.com/cmd/derper
-   L    tailscale.com/net/tcpinfo                                    from tailscale.com/derp
         tailscale.com/net/tlsdial                                    from tailscale.com/derp/derphttp
         tailscale.com/net/tsaddr                                     from tailscale.com/ipn+
      💣 tailscale.com/net/tshttpproxy                                from tailscale.com/derp/derphttp+
@@ -156,9 +130,8 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         tailscale.com/util/dnsname                                   from tailscale.com/hostinfo+
         tailscale.com/util/httpm                                     from tailscale.com/client/tailscale
         tailscale.com/util/lineread                                  from tailscale.com/hostinfo+
-   L 💣 tailscale.com/util/linuxfw                                   from tailscale.com/net/netns
         tailscale.com/util/mak                                       from tailscale.com/syncs+
-        tailscale.com/util/multierr                                  from tailscale.com/health+
+        tailscale.com/util/multierr                                  from tailscale.com/health
         tailscale.com/util/set                                       from tailscale.com/health+
         tailscale.com/util/singleflight                              from tailscale.com/net/dnscache
         tailscale.com/util/slicesx                                   from tailscale.com/cmd/derper+
@@ -182,7 +155,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         golang.org/x/crypto/nacl/secretbox                           from golang.org/x/crypto/nacl/box
         golang.org/x/crypto/salsa20/salsa                            from golang.org/x/crypto/nacl/box+
         golang.org/x/exp/constraints                                 from golang.org/x/exp/slices
-        golang.org/x/exp/maps                                        from tailscale.com/types/views
         golang.org/x/exp/slices                                      from tailscale.com/net/tsaddr+
    L    golang.org/x/net/bpf                                         from github.com/mdlayher/netlink+
         golang.org/x/net/dns/dnsmessage                              from net+
@@ -208,7 +180,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         bytes                                                        from bufio+
         compress/flate                                               from compress/gzip+
         compress/gzip                                                from internal/profile+
-   L    compress/zlib                                                from debug/elf
         container/list                                               from crypto/tls+
         context                                                      from crypto/tls+
         crypto                                                       from crypto/ecdsa+
@@ -232,8 +203,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         crypto/tls                                                   from golang.org/x/crypto/acme+
         crypto/x509                                                  from crypto/tls+
         crypto/x509/pkix                                             from crypto/x509+
-   L    debug/dwarf                                                  from debug/elf
-   L    debug/elf                                                    from golang.org/x/sys/unix
         embed                                                        from crypto/internal/nistec+
         encoding                                                     from encoding/json+
         encoding/asn1                                                from crypto/x509+
@@ -249,7 +218,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         fmt                                                          from compress/flate+
         go/token                                                     from google.golang.org/protobuf/internal/strs
         hash                                                         from crypto+
-   L    hash/adler32                                                 from compress/zlib
         hash/crc32                                                   from compress/gzip+
         hash/fnv                                                     from google.golang.org/protobuf/internal/detrand
         hash/maphash                                                 from go4.org/mem
@@ -258,7 +226,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         io/fs                                                        from crypto/x509+
         io/ioutil                                                    from github.com/mitchellh/go-ps+
         log                                                          from expvar+
-        log/internal                                                 from log
         math                                                         from compress/flate+
         math/big                                                     from crypto/dsa+
         math/bits                                                    from compress/flate+

cmd/k8s-operator/operator.go

@@ -274,6 +274,8 @@ const (
 	AnnotationExpose   = "tailscale.com/expose"
 	AnnotationTags     = "tailscale.com/tags"
 	AnnotationHostname = "tailscale.com/hostname"
+
+	AnnotationTargetIP = "tailscale.com/target-ip"
 )
 
 // ServiceReconciler is a simple ControllerManagedBy example implementation.
@@ -321,7 +323,7 @@ func (a *ServiceReconciler) Reconcile(ctx context.Context, req reconcile.Request
 	} else if err != nil {
 		return reconcile.Result{}, fmt.Errorf("failed to get svc: %w", err)
 	}
-	if !svc.DeletionTimestamp.IsZero() || !a.shouldExpose(svc) {
+	if !svc.DeletionTimestamp.IsZero() || (!a.shouldExpose(svc) && !a.hasTargetAnnotation(svc)) {
 		logger.Debugf("service is being deleted or should not be exposed, cleaning up")
 		return reconcile.Result{}, a.maybeCleanup(ctx, logger, svc)
 	}
@@ -402,6 +404,7 @@ func (a *ServiceReconciler) maybeCleanup(ctx context.Context, logger *zap.Sugare
 	return nil
 }
 
+// TODO(maisem): XXXXXXXXXXXXXXXXXXX update docs
 // maybeProvision ensures that svc is exposed over tailscale, taking any actions
 // necessary to reach that state.
 //
@@ -444,6 +447,19 @@ func (a *ServiceReconciler) maybeProvision(ctx context.Context, logger *zap.Suga
 		return fmt.Errorf("failed to reconcile statefulset: %w", err)
 	}
 
+	if a.hasTargetAnnotation(svc) {
+		headlessSvcName := hsvc.Name + "." + hsvc.Namespace + ".svc"
+		if svc.Spec.ExternalName != headlessSvcName || svc.Spec.Type != corev1.ServiceTypeExternalName {
+			svc.Spec.ExternalName = headlessSvcName
+			svc.Spec.Selector = nil
+			svc.Spec.Type = corev1.ServiceTypeExternalName
+			if err := a.Update(ctx, svc); err != nil {
+				return fmt.Errorf("failed to update service: %w", err)
+			}
+		}
+		return nil
+	}
+
 	if !a.hasLoadBalancerClass(svc) {
 		logger.Debugf("service is not a LoadBalancer, so not updating ingress")
 		return nil
@@ -482,7 +498,7 @@ func (a *ServiceReconciler) shouldExpose(svc *corev1.Service) bool {
 		return false
 	}
 
-	return a.hasLoadBalancerClass(svc) || a.hasAnnotation(svc)
+	return a.hasLoadBalancerClass(svc) || a.hasExposeAnnotation(svc)
 }
 
 func (a *ServiceReconciler) hasLoadBalancerClass(svc *corev1.Service) bool {
@@ -492,9 +508,12 @@ func (a *ServiceReconciler) hasLoadBalancerClass(svc *corev1.Service) bool {
 		*svc.Spec.LoadBalancerClass == "tailscale"
 }
 
-func (a *ServiceReconciler) hasAnnotation(svc *corev1.Service) bool {
-	return svc != nil &&
-		svc.Annotations[AnnotationExpose] == "true"
+func (a *ServiceReconciler) hasExposeAnnotation(svc *corev1.Service) bool {
+	return svc != nil && svc.Annotations[AnnotationExpose] == "true"
+}
+
+func (a *ServiceReconciler) hasTargetAnnotation(svc *corev1.Service) bool {
+	return svc != nil && svc.Annotations[AnnotationTargetIP] != ""
 }
 
 func (a *ServiceReconciler) reconcileHeadlessService(ctx context.Context, logger *zap.SugaredLogger, svc *corev1.Service) (*corev1.Service, error) {
@@ -612,11 +631,22 @@ func (a *ServiceReconciler) reconcileSTS(ctx context.Context, logger *zap.Sugare
 	}
 	container := &ss.Spec.Template.Spec.Containers[0]
 	container.Image = a.proxyImage
+	if ip := parentSvc.Annotations[AnnotationTargetIP]; ip != "" {
+		container.Env = append(container.Env,
+			corev1.EnvVar{
+				Name:  "TS_EGRESS_IP",
+				Value: ip,
+			},
+		)
+	} else {
+		container.Env = append(container.Env,
+			corev1.EnvVar{
+				Name:  "TS_DEST_IP",
+				Value: parentSvc.Spec.ClusterIP,
+			},
+		)
+	}
 	container.Env = append(container.Env,
-		corev1.EnvVar{
-			Name:  "TS_DEST_IP",
-			Value: parentSvc.Spec.ClusterIP,
-		},
 		corev1.EnvVar{
 			Name:  "TS_KUBE_SECRET",
 			Value: authKeySecret,

cmd/sniproxy/sniproxy.go

@@ -26,7 +26,6 @@ import (
 
 var (
 	ports        = flag.String("ports", "443", "comma-separated list of ports to proxy")
-	wgPort       = flag.Int("wg-listen-port", 0, "UDP port to listen on for WireGuard and peer-to-peer traffic; 0 means automatically select")
 	promoteHTTPS = flag.Bool("promote-https", true, "promote HTTP to HTTPS")
 )
 
@@ -41,7 +40,6 @@ func main() {
 	hostinfo.SetApp("sniproxy")
 
 	var s server
-	s.ts.Port = uint16(*wgPort)
 	defer s.ts.Close()
 
 	lc, err := s.ts.LocalClient()

cmd/tailscale/cli/funnel.go

@@ -30,10 +30,10 @@ func newFunnelCommand(e *serveEnv) *ffcli.Command {
 	return &ffcli.Command{
 		Name:      "funnel",
 		ShortHelp: "Turn on/off Funnel service",
-		ShortUsage: strings.Join([]string{
-			"funnel <serve-port> {on|off}",
-			"funnel status [--json]",
-		}, "\n  "),
+		ShortUsage: strings.TrimSpace(`
+funnel <serve-port> {on|off}
+  funnel status [--json]
+`),
 		LongHelp: strings.Join([]string{
 			"Funnel allows you to publish a 'tailscale serve'",
 			"server publicly, open to the entire internet.",

cmd/tailscale/cli/network-lock.go

@@ -465,16 +465,7 @@ func runNetworkLockSign(ctx context.Context, args []string) error {
 		}
 	}
 
-	err := localClient.NetworkLockSign(ctx, nodeKey, []byte(rotationKey.Verifier()))
-	// Provide a better help message for when someone clicks through the signing flow
-	// on the wrong device.
-	if err != nil && strings.Contains(err.Error(), "this node is not trusted by network lock") {
-		fmt.Fprintln(os.Stderr, "Error: Signing is not available on this device because it does not have a trusted tailnet lock key.")
-		fmt.Fprintln(os.Stderr)
-		fmt.Fprintln(os.Stderr, "Try again on a signing device instead. Tailnet admins can see signing devices on the admin panel.")
-		fmt.Fprintln(os.Stderr)
-	}
-	return err
+	return localClient.NetworkLockSign(ctx, nodeKey, []byte(rotationKey.Verifier()))
 }
 
 var nlDisableCmd = &ffcli.Command{

cmd/tailscale/cli/ping.go

@@ -51,7 +51,7 @@ relay node.
 		fs.BoolVar(&pingArgs.tsmp, "tsmp", false, "do a TSMP-level ping (through WireGuard, but not either host OS stack)")
 		fs.BoolVar(&pingArgs.icmp, "icmp", false, "do a ICMP-level ping (through WireGuard, but not the local host OS stack)")
 		fs.BoolVar(&pingArgs.peerAPI, "peerapi", false, "try hitting the peer's peerapi HTTP server")
-		fs.IntVar(&pingArgs.num, "c", 10, "max number of pings to send. 0 for infinity.")
+		fs.IntVar(&pingArgs.num, "c", 10, "max number of pings to send")
 		fs.DurationVar(&pingArgs.timeout, "timeout", 5*time.Second, "timeout before giving up on a ping")
 		return fs
 	})(),

cmd/tailscale/cli/serve.go

@@ -35,14 +35,13 @@ func newServeCommand(e *serveEnv) *ffcli.Command {
 	return &ffcli.Command{
 		Name:      "serve",
 		ShortHelp: "Serve content and local servers",
-		ShortUsage: strings.Join([]string{
-			"serve http:<port> <mount-point> <source> [off]",
-			"serve https:<port> <mount-point> <source> [off]",
-			"serve tcp:<port> tcp://localhost:<local-port> [off]",
-			"serve tls-terminated-tcp:<port> tcp://localhost:<local-port> [off]",
-			"serve status [--json]",
-			"serve reset",
-		}, "\n  "),
+		ShortUsage: strings.TrimSpace(`
+serve https:<port> <mount-point> <source> [off]
+  serve tcp:<port> tcp://localhost:<local-port> [off]
+  serve tls-terminated-tcp:<port> tcp://localhost:<local-port> [off]
+  serve status [--json]
+  serve reset
+`),
 		LongHelp: strings.TrimSpace(`
 *** BETA; all of this is subject to change ***
 
@@ -59,8 +58,8 @@ EXAMPLES
   - To proxy requests to a web server at 127.0.0.1:3000:
     $ tailscale serve https:443 / http://127.0.0.1:3000
 
-    Or, using the default port (443):
-    $ tailscale serve https / http://127.0.0.1:3000
+	Or, using the default port:
+	$ tailscale serve https / http://127.0.0.1:3000
 
   - To serve a single file or a directory of files:
     $ tailscale serve https / /home/alice/blog/index.html
@@ -69,12 +68,6 @@ EXAMPLES
   - To serve simple static text:
     $ tailscale serve https:8080 / text:"Hello, world!"
 
-  - To serve over HTTP (tailnet only):
-    $ tailscale serve http:80 / http://127.0.0.1:3000
-
-    Or, using the default port (80):
-    $ tailscale serve http / http://127.0.0.1:3000
-
   - To forward incoming TCP connections on port 2222 to a local TCP server on
     port 22 (e.g. to run OpenSSH in parallel with Tailscale SSH):
     $ tailscale serve tcp:2222 tcp://localhost:22
@@ -182,7 +175,6 @@ func (e *serveEnv) getLocalClientStatus(ctx context.Context) (*ipnstate.Status,
 // serve config types like proxy, path, and text.
 //
 // Examples:
-// - tailscale serve http / http://localhost:3000
 // - tailscale serve https / http://localhost:3000
 // - tailscale serve https /images/ /var/www/images/
 // - tailscale serve https:10000 /motd.txt text:"Hello, world!"
@@ -207,14 +199,19 @@ func (e *serveEnv) runServe(ctx context.Context, args []string) error {
 		return e.lc.SetServeConfig(ctx, sc)
 	}
 
+	parsePort := func(portStr string) (uint16, error) {
+		port64, err := strconv.ParseUint(portStr, 10, 16)
+		if err != nil {
+			return 0, err
+		}
+		return uint16(port64), nil
+	}
+
 	srcType, srcPortStr, found := strings.Cut(args[0], ":")
 	if !found {
 		if srcType == "https" && srcPortStr == "" {
 			// Default https port to 443.
 			srcPortStr = "443"
-		} else if srcType == "http" && srcPortStr == "" {
-			// Default http port to 80.
-			srcPortStr = "80"
 		} else {
 			return flag.ErrHelp
 		}
@@ -222,18 +219,18 @@ func (e *serveEnv) runServe(ctx context.Context, args []string) error {
 
 	turnOff := "off" == args[len(args)-1]
 
-	if len(args) < 2 || ((srcType == "https" || srcType == "http") && !turnOff && len(args) < 3) {
+	if len(args) < 2 || (srcType == "https" && !turnOff && len(args) < 3) {
 		fmt.Fprintf(os.Stderr, "error: invalid number of arguments\n\n")
 		return flag.ErrHelp
 	}
 
-	srcPort, err := parseServePort(srcPortStr)
+	srcPort, err := parsePort(srcPortStr)
 	if err != nil {
-		return fmt.Errorf("invalid port %q: %w", srcPortStr, err)
+		return err
 	}
 
 	switch srcType {
-	case "https", "http":
+	case "https":
 		mount, err := cleanMountPoint(args[1])
 		if err != nil {
 			return err
@@ -241,8 +238,7 @@ func (e *serveEnv) runServe(ctx context.Context, args []string) error {
 		if turnOff {
 			return e.handleWebServeRemove(ctx, srcPort, mount)
 		}
-		useTLS := srcType == "https"
-		return e.handleWebServe(ctx, srcPort, useTLS, mount, args[2])
+		return e.handleWebServe(ctx, srcPort, mount, args[2])
 	case "tcp", "tls-terminated-tcp":
 		if turnOff {
 			return e.handleTCPServeRemove(ctx, srcPort)
@@ -250,20 +246,20 @@ func (e *serveEnv) runServe(ctx context.Context, args []string) error {
 		return e.handleTCPServe(ctx, srcType, srcPort, args[1])
 	default:
 		fmt.Fprintf(os.Stderr, "error: invalid serve type %q\n", srcType)
-		fmt.Fprint(os.Stderr, "must be one of: http:<port>, https:<port>, tcp:<port> or tls-terminated-tcp:<port>\n\n", srcType)
+		fmt.Fprint(os.Stderr, "must be one of: https:<port>, tcp:<port> or tls-terminated-tcp:<port>\n\n", srcType)
 		return flag.ErrHelp
 	}
 }
 
-// handleWebServe handles the "tailscale serve (http/https):..." subcommand. It
-// configures the serve config to forward HTTPS connections to the given source.
+// handleWebServe handles the "tailscale serve https:..." subcommand.
+// It configures the serve config to forward HTTPS connections to the
+// given source.
 //
 // Examples:
-//   - tailscale serve http / http://localhost:3000
 //   - tailscale serve https / http://localhost:3000
 //   - tailscale serve https:8443 /files/ /home/alice/shared-files/
 //   - tailscale serve https:10000 /motd.txt text:"Hello, world!"
-func (e *serveEnv) handleWebServe(ctx context.Context, srvPort uint16, useTLS bool, mount, source string) error {
+func (e *serveEnv) handleWebServe(ctx context.Context, srvPort uint16, mount, source string) error {
 	h := new(ipn.HTTPHandler)
 
 	ts, _, _ := strings.Cut(source, ":")
@@ -322,7 +318,7 @@ func (e *serveEnv) handleWebServe(ctx context.Context, srvPort uint16, useTLS bo
 		return flag.ErrHelp
 	}
 
-	mak.Set(&sc.TCP, srvPort, &ipn.TCPPortHandler{HTTPS: useTLS, HTTP: !useTLS})
+	mak.Set(&sc.TCP, srvPort, &ipn.TCPPortHandler{HTTPS: true})
 
 	if _, ok := sc.Web[hp]; !ok {
 		mak.Set(&sc.Web, hp, new(ipn.WebServerConfig))
@@ -630,10 +626,7 @@ func (e *serveEnv) runServeStatus(ctx context.Context, args []string) error {
 		printf("\n")
 	}
 	for hp := range sc.Web {
-		err := e.printWebStatusTree(sc, hp)
-		if err != nil {
-			return err
-		}
+		printWebStatusTree(sc, hp)
 		printf("\n")
 	}
 	printFunnelWarning(sc)
@@ -672,37 +665,20 @@ func printTCPStatusTree(ctx context.Context, sc *ipn.ServeConfig, st *ipnstate.S
 	return nil
 }
 
-func (e *serveEnv) printWebStatusTree(sc *ipn.ServeConfig, hp ipn.HostPort) error {
-	// No-op if no serve config
+func printWebStatusTree(sc *ipn.ServeConfig, hp ipn.HostPort) {
 	if sc == nil {
-		return nil
+		return
 	}
 	fStatus := "tailnet only"
 	if sc.AllowFunnel[hp] {
 		fStatus = "Funnel on"
 	}
 	host, portStr, _ := net.SplitHostPort(string(hp))
-
-	port, err := parseServePort(portStr)
-	if err != nil {
-		return fmt.Errorf("invalid port %q: %w", portStr, err)
+	if portStr == "443" {
+		printf("https://%s (%s)\n", host, fStatus)
+	} else {
+		printf("https://%s:%s (%s)\n", host, portStr, fStatus)
 	}
-
-	scheme := "https"
-	if sc.IsServingHTTP(port) {
-		scheme = "http"
-	}
-
-	portPart := ":" + portStr
-	if scheme == "http" && portStr == "80" ||
-		scheme == "https" && portStr == "443" {
-		portPart = ""
-	}
-	if scheme == "http" {
-		hostname, _, _ := strings.Cut("host", ".")
-		printf("%s://%s%s (%s)\n", scheme, hostname, portPart, fStatus)
-	}
-	printf("%s://%s%s (%s)\n", scheme, host, portPart, fStatus)
 	srvTypeAndDesc := func(h *ipn.HTTPHandler) (string, string) {
 		switch {
 		case h.Path != "":
@@ -729,8 +705,6 @@ func (e *serveEnv) printWebStatusTree(sc *ipn.ServeConfig, hp ipn.HostPort) erro
 		t, d := srvTypeAndDesc(h)
 		printf("%s %s%s %-5s %s\n", "|--", m, strings.Repeat(" ", maxLen-len(m)), t, d)
 	}
-
-	return nil
 }
 
 func elipticallyTruncate(s string, max int) string {
@@ -751,16 +725,3 @@ func (e *serveEnv) runServeReset(ctx context.Context, args []string) error {
 	sc := new(ipn.ServeConfig)
 	return e.lc.SetServeConfig(ctx, sc)
 }
-
-// parseServePort parses a port number from a string and returns it as a
-// uint16. It returns an error if the port number is invalid or zero.
-func parseServePort(s string) (uint16, error) {
-	p, err := strconv.ParseUint(s, 10, 16)
-	if err != nil {
-		return 0, err
-	}
-	if p == 0 {
-		return 0, errors.New("port number must be non-zero")
-	}
-	return uint16(p), nil
-}

cmd/tailscale/cli/serve_test.go

@@ -89,59 +89,6 @@ func TestServeConfigMutations(t *testing.T) {
 		wantErr: exactErr(flag.ErrHelp, "flag.ErrHelp"),
 	})
 
-	// https
-	add(step{reset: true})
-	add(step{ // allow omitting port (default to 80)
-		command: cmd("http / http://localhost:3000"),
-		want: &ipn.ServeConfig{
-			TCP: map[uint16]*ipn.TCPPortHandler{80: {HTTP: true}},
-			Web: map[ipn.HostPort]*ipn.WebServerConfig{
-				"foo.test.ts.net:80": {Handlers: map[string]*ipn.HTTPHandler{
-					"/": {Proxy: "http://127.0.0.1:3000"},
-				}},
-			},
-		},
-	})
-	add(step{ // support non Funnel port
-		command: cmd("http:9999 /abc http://localhost:3001"),
-		want: &ipn.ServeConfig{
-			TCP: map[uint16]*ipn.TCPPortHandler{80: {HTTP: true}, 9999: {HTTP: true}},
-			Web: map[ipn.HostPort]*ipn.WebServerConfig{
-				"foo.test.ts.net:80": {Handlers: map[string]*ipn.HTTPHandler{
-					"/": {Proxy: "http://127.0.0.1:3000"},
-				}},
-				"foo.test.ts.net:9999": {Handlers: map[string]*ipn.HTTPHandler{
-					"/abc": {Proxy: "http://127.0.0.1:3001"},
-				}},
-			},
-		},
-	})
-	add(step{
-		command: cmd("http:9999 /abc off"),
-		want: &ipn.ServeConfig{
-			TCP: map[uint16]*ipn.TCPPortHandler{80: {HTTP: true}},
-			Web: map[ipn.HostPort]*ipn.WebServerConfig{
-				"foo.test.ts.net:80": {Handlers: map[string]*ipn.HTTPHandler{
-					"/": {Proxy: "http://127.0.0.1:3000"},
-				}},
-			},
-		},
-	})
-	add(step{
-		command: cmd("http:8080 /abc http://127.0.0.1:3001"),
-		want: &ipn.ServeConfig{
-			TCP: map[uint16]*ipn.TCPPortHandler{80: {HTTP: true}, 8080: {HTTP: true}},
-			Web: map[ipn.HostPort]*ipn.WebServerConfig{
-				"foo.test.ts.net:80": {Handlers: map[string]*ipn.HTTPHandler{
-					"/": {Proxy: "http://127.0.0.1:3000"},
-				}},
-				"foo.test.ts.net:8080": {Handlers: map[string]*ipn.HTTPHandler{
-					"/abc": {Proxy: "http://127.0.0.1:3001"},
-				}},
-			},
-		},
-	})
-
 	// https
 	add(step{reset: true})
 	add(step{

cmd/tailscale/depaware.txt

@@ -10,15 +10,8 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
    W 💣 github.com/alexbrainman/sspi                                 from github.com/alexbrainman/sspi/negotiate+
    W    github.com/alexbrainman/sspi/internal/common                 from github.com/alexbrainman/sspi/negotiate
    W 💣 github.com/alexbrainman/sspi/negotiate                       from tailscale.com/net/tshttpproxy
-   L    github.com/coreos/go-iptables/iptables                       from tailscale.com/util/linuxfw
         github.com/fxamacker/cbor/v2                                 from tailscale.com/tka
         github.com/golang/groupcache/lru                             from tailscale.com/net/dnscache
-   L    github.com/google/nftables                                   from tailscale.com/util/linuxfw
-   L 💣 github.com/google/nftables/alignedbuff                       from github.com/google/nftables/xt
-   L 💣 github.com/google/nftables/binaryutil                        from github.com/google/nftables+
-   L    github.com/google/nftables/expr                              from github.com/google/nftables+
-   L    github.com/google/nftables/internal/parseexprfunc            from github.com/google/nftables+
-   L    github.com/google/nftables/xt                                from github.com/google/nftables/expr+
         github.com/google/uuid                                       from tailscale.com/util/quarantine+
         github.com/hdevalence/ed25519consensus                       from tailscale.com/tka
    L    github.com/josharian/native                                  from github.com/mdlayher/netlink+
@@ -30,7 +23,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
      💣 github.com/mattn/go-isatty                                   from github.com/mattn/go-colorable+
    L 💣 github.com/mdlayher/netlink                                  from github.com/jsimonetti/rtnetlink+
    L 💣 github.com/mdlayher/netlink/nlenc                            from github.com/jsimonetti/rtnetlink+
-   L    github.com/mdlayher/netlink/nltest                           from github.com/google/nftables
    L 💣 github.com/mdlayher/socket                                   from github.com/mdlayher/netlink
      💣 github.com/mitchellh/go-ps                                   from tailscale.com/cmd/tailscale/cli+
         github.com/peterbourgon/ff/v3                                from github.com/peterbourgon/ff/v3/ffcli
@@ -44,30 +36,13 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         github.com/tailscale/goupnp/scpd                             from github.com/tailscale/goupnp
         github.com/tailscale/goupnp/soap                             from github.com/tailscale/goupnp+
         github.com/tailscale/goupnp/ssdp                             from github.com/tailscale/goupnp
-   L 💣 github.com/tailscale/netlink                                 from tailscale.com/util/linuxfw
         github.com/tcnksm/go-httpstat                                from tailscale.com/net/netcheck
         github.com/toqueteos/webbrowser                              from tailscale.com/cmd/tailscale/cli
-   L 💣 github.com/vishvananda/netlink/nl                            from github.com/tailscale/netlink
-   L    github.com/vishvananda/netns                                 from github.com/tailscale/netlink+
         github.com/x448/float16                                      from github.com/fxamacker/cbor/v2
      💣 go4.org/mem                                                  from tailscale.com/derp+
         go4.org/netipx                                               from tailscale.com/wgengine/filter
    W 💣 golang.zx2c4.com/wireguard/windows/tunnel/winipcfg           from tailscale.com/net/interfaces+
         gopkg.in/yaml.v2                                             from sigs.k8s.io/yaml
-   L    gvisor.dev/gvisor/pkg/abi                                    from gvisor.dev/gvisor/pkg/abi/linux
-   L 💣 gvisor.dev/gvisor/pkg/abi/linux                              from tailscale.com/util/linuxfw
-   L    gvisor.dev/gvisor/pkg/bits                                   from gvisor.dev/gvisor/pkg/abi/linux
-   L    gvisor.dev/gvisor/pkg/context                                from gvisor.dev/gvisor/pkg/abi/linux
-   L 💣 gvisor.dev/gvisor/pkg/gohacks                                from gvisor.dev/gvisor/pkg/abi/linux+
-   L 💣 gvisor.dev/gvisor/pkg/hostarch                               from gvisor.dev/gvisor/pkg/abi/linux+
-   L    gvisor.dev/gvisor/pkg/linewriter                             from gvisor.dev/gvisor/pkg/log
-   L    gvisor.dev/gvisor/pkg/log                                    from gvisor.dev/gvisor/pkg/context
-   L    gvisor.dev/gvisor/pkg/marshal                                from gvisor.dev/gvisor/pkg/abi/linux+
-   L 💣 gvisor.dev/gvisor/pkg/marshal/primitive                      from gvisor.dev/gvisor/pkg/abi/linux
-   L 💣 gvisor.dev/gvisor/pkg/state                                  from gvisor.dev/gvisor/pkg/abi/linux+
-   L    gvisor.dev/gvisor/pkg/state/wire                             from gvisor.dev/gvisor/pkg/state
-   L 💣 gvisor.dev/gvisor/pkg/sync                                   from gvisor.dev/gvisor/pkg/linewriter+
-   L    gvisor.dev/gvisor/pkg/waiter                                 from gvisor.dev/gvisor/pkg/context
         k8s.io/client-go/util/homedir                                from tailscale.com/cmd/tailscale/cli
         nhooyr.io/websocket                                          from tailscale.com/derp/derphttp+
         nhooyr.io/websocket/internal/errd                            from nhooyr.io/websocket
@@ -109,7 +84,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         tailscale.com/net/portmapper                                 from tailscale.com/net/netcheck+
         tailscale.com/net/sockstats                                  from tailscale.com/control/controlhttp+
         tailscale.com/net/stun                                       from tailscale.com/net/netcheck
-   L    tailscale.com/net/tcpinfo                                    from tailscale.com/derp
         tailscale.com/net/tlsdial                                    from tailscale.com/derp/derphttp+
         tailscale.com/net/tsaddr                                     from tailscale.com/net/interfaces+
      💣 tailscale.com/net/tshttpproxy                                from tailscale.com/derp/derphttp+
@@ -146,7 +120,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         tailscale.com/util/groupmember                               from tailscale.com/cmd/tailscale/cli
         tailscale.com/util/httpm                                     from tailscale.com/client/tailscale
         tailscale.com/util/lineread                                  from tailscale.com/net/interfaces+
-   L 💣 tailscale.com/util/linuxfw                                   from tailscale.com/net/netns
         tailscale.com/util/mak                                       from tailscale.com/net/netcheck+
         tailscale.com/util/multierr                                  from tailscale.com/control/controlhttp+
         tailscale.com/util/must                                      from tailscale.com/cmd/tailscale/cli
@@ -173,7 +146,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         golang.org/x/crypto/pbkdf2                                   from software.sslmate.com/src/go-pkcs12
         golang.org/x/crypto/salsa20/salsa                            from golang.org/x/crypto/nacl/box+
         golang.org/x/exp/constraints                                 from golang.org/x/exp/slices
-        golang.org/x/exp/maps                                        from tailscale.com/types/views
         golang.org/x/exp/slices                                      from tailscale.com/net/tsaddr+
         golang.org/x/net/bpf                                         from github.com/mdlayher/netlink+
         golang.org/x/net/dns/dnsmessage                              from net+
@@ -205,7 +177,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         bytes                                                        from bufio+
         compress/flate                                               from compress/gzip+
         compress/gzip                                                from net/http
-        compress/zlib                                                from image/png+
+        compress/zlib                                                from image/png
         container/list                                               from crypto/tls+
         context                                                      from crypto/tls+
         crypto                                                       from crypto/ecdsa+
@@ -230,8 +202,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         crypto/x509                                                  from crypto/tls+
         crypto/x509/pkix                                             from crypto/x509+
         database/sql/driver                                          from github.com/google/uuid
-   L    debug/dwarf                                                  from debug/elf
-   L    debug/elf                                                    from golang.org/x/sys/unix
         embed                                                        from tailscale.com/cmd/tailscale/cli+
         encoding                                                     from encoding/json+
         encoding/asn1                                                from crypto/x509+
@@ -259,7 +229,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         io/fs                                                        from crypto/x509+
         io/ioutil                                                    from golang.org/x/sys/cpu+
         log                                                          from expvar+
-        log/internal                                                 from log
         math                                                         from compress/flate+
         math/big                                                     from crypto/dsa+
         math/bits                                                    from compress/flate+

cmd/tailscaled/depaware.txt

@@ -75,7 +75,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L    github.com/aws/smithy-go/transport/http                      from github.com/aws/aws-sdk-go-v2/aws/middleware+
    L    github.com/aws/smithy-go/transport/http/internal/io          from github.com/aws/smithy-go/transport/http
    L    github.com/aws/smithy-go/waiter                              from github.com/aws/aws-sdk-go-v2/service/ssm
-   L    github.com/coreos/go-iptables/iptables                       from tailscale.com/util/linuxfw
+   L    github.com/coreos/go-iptables/iptables                       from tailscale.com/wgengine/router
   LD 💣 github.com/creack/pty                                        from tailscale.com/ssh/tailssh
    W 💣 github.com/dblohm7/wingoes                                   from github.com/dblohm7/wingoes/com
    W 💣 github.com/dblohm7/wingoes/com                               from tailscale.com/cmd/tailscaled
@@ -86,12 +86,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L 💣 github.com/godbus/dbus/v5                                    from tailscale.com/net/dns+
         github.com/golang/groupcache/lru                             from tailscale.com/net/dnscache
         github.com/google/btree                                      from gvisor.dev/gvisor/pkg/tcpip/header+
-   L    github.com/google/nftables                                   from tailscale.com/util/linuxfw
-   L 💣 github.com/google/nftables/alignedbuff                       from github.com/google/nftables/xt
-   L 💣 github.com/google/nftables/binaryutil                        from github.com/google/nftables+
-   L    github.com/google/nftables/expr                              from github.com/google/nftables+
-   L    github.com/google/nftables/internal/parseexprfunc            from github.com/google/nftables+
-   L    github.com/google/nftables/xt                                from github.com/google/nftables/expr+
         github.com/hdevalence/ed25519consensus                       from tailscale.com/tka
    L 💣 github.com/illarion/gonotify                                 from tailscale.com/net/dns
    L    github.com/insomniacslk/dhcp/dhcpv4                          from tailscale.com/net/tstun
@@ -115,7 +109,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L    github.com/mdlayher/genetlink                                from tailscale.com/net/tstun
    L 💣 github.com/mdlayher/netlink                                  from github.com/jsimonetti/rtnetlink+
    L 💣 github.com/mdlayher/netlink/nlenc                            from github.com/jsimonetti/rtnetlink+
-   L    github.com/mdlayher/netlink/nltest                           from github.com/google/nftables
    L    github.com/mdlayher/sdnotify                                 from tailscale.com/util/systemd
    L 💣 github.com/mdlayher/socket                                   from github.com/mdlayher/netlink
      💣 github.com/mitchellh/go-ps                                   from tailscale.com/safesocket
@@ -160,18 +153,13 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         go4.org/netipx                                               from tailscale.com/ipn/ipnlocal+
    W 💣 golang.zx2c4.com/wintun                                      from github.com/tailscale/wireguard-go/tun+
    W 💣 golang.zx2c4.com/wireguard/windows/tunnel/winipcfg           from tailscale.com/net/dns+
-   L    gvisor.dev/gvisor/pkg/abi                                    from gvisor.dev/gvisor/pkg/abi/linux
-   L 💣 gvisor.dev/gvisor/pkg/abi/linux                              from tailscale.com/util/linuxfw
         gvisor.dev/gvisor/pkg/atomicbitops                           from gvisor.dev/gvisor/pkg/tcpip+
-        gvisor.dev/gvisor/pkg/bits                                   from gvisor.dev/gvisor/pkg/bufferv2+
+        gvisor.dev/gvisor/pkg/bits                                   from gvisor.dev/gvisor/pkg/bufferv2
      💣 gvisor.dev/gvisor/pkg/bufferv2                               from gvisor.dev/gvisor/pkg/tcpip+
-        gvisor.dev/gvisor/pkg/context                                from gvisor.dev/gvisor/pkg/refs+
+        gvisor.dev/gvisor/pkg/context                                from gvisor.dev/gvisor/pkg/refs
      💣 gvisor.dev/gvisor/pkg/gohacks                                from gvisor.dev/gvisor/pkg/state/wire+
-   L 💣 gvisor.dev/gvisor/pkg/hostarch                               from gvisor.dev/gvisor/pkg/abi/linux+
         gvisor.dev/gvisor/pkg/linewriter                             from gvisor.dev/gvisor/pkg/log
         gvisor.dev/gvisor/pkg/log                                    from gvisor.dev/gvisor/pkg/context+
-   L    gvisor.dev/gvisor/pkg/marshal                                from gvisor.dev/gvisor/pkg/abi/linux+
-   L 💣 gvisor.dev/gvisor/pkg/marshal/primitive                      from gvisor.dev/gvisor/pkg/abi/linux
         gvisor.dev/gvisor/pkg/rand                                   from gvisor.dev/gvisor/pkg/tcpip/network/hash+
         gvisor.dev/gvisor/pkg/refs                                   from gvisor.dev/gvisor/pkg/bufferv2+
      💣 gvisor.dev/gvisor/pkg/sleep                                  from gvisor.dev/gvisor/pkg/tcpip/transport/tcp
@@ -276,7 +264,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/net/socks5                                     from tailscale.com/cmd/tailscaled
         tailscale.com/net/sockstats                                  from tailscale.com/control/controlclient+
         tailscale.com/net/stun                                       from tailscale.com/net/netcheck+
-   L    tailscale.com/net/tcpinfo                                    from tailscale.com/derp
         tailscale.com/net/tlsdial                                    from tailscale.com/control/controlclient+
         tailscale.com/net/tsaddr                                     from tailscale.com/ipn+
         tailscale.com/net/tsdial                                     from tailscale.com/control/controlclient+
@@ -330,7 +317,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
      💣 tailscale.com/util/hashx                                     from tailscale.com/util/deephash
         tailscale.com/util/httpm                                     from tailscale.com/client/tailscale+
         tailscale.com/util/lineread                                  from tailscale.com/hostinfo+
-   L 💣 tailscale.com/util/linuxfw                                   from tailscale.com/net/netns+
         tailscale.com/util/mak                                       from tailscale.com/control/controlclient+
         tailscale.com/util/multierr                                  from tailscale.com/control/controlclient+
         tailscale.com/util/must                                      from tailscale.com/logpolicy
@@ -379,7 +365,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         golang.org/x/crypto/salsa20/salsa                            from golang.org/x/crypto/nacl/box+
   LD    golang.org/x/crypto/ssh                                      from tailscale.com/ssh/tailssh+
         golang.org/x/exp/constraints                                 from golang.org/x/exp/slices+
-        golang.org/x/exp/maps                                        from tailscale.com/wgengine+
+        golang.org/x/exp/maps                                        from tailscale.com/wgengine
         golang.org/x/exp/slices                                      from tailscale.com/ipn/ipnlocal+
         golang.org/x/net/bpf                                         from github.com/mdlayher/genetlink+
         golang.org/x/net/dns/dnsmessage                              from net+
@@ -412,7 +398,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         bytes                                                        from bufio+
         compress/flate                                               from compress/gzip+
         compress/gzip                                                from golang.org/x/net/http2+
-   L    compress/zlib                                                from debug/elf
         container/heap                                               from gvisor.dev/gvisor/pkg/tcpip/transport/tcp
         container/list                                               from crypto/tls+
         context                                                      from crypto/tls+
@@ -437,8 +422,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         crypto/tls                                                   from github.com/tcnksm/go-httpstat+
         crypto/x509                                                  from crypto/tls+
         crypto/x509/pkix                                             from crypto/x509+
-   L    debug/dwarf                                                  from debug/elf
-   L    debug/elf                                                    from golang.org/x/sys/unix
         embed                                                        from tailscale.com+
         encoding                                                     from encoding/json+
         encoding/asn1                                                from crypto/x509+
@@ -454,7 +437,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         flag                                                         from net/http/httptest+
         fmt                                                          from compress/flate+
         hash                                                         from crypto+
-        hash/adler32                                                 from tailscale.com/ipn/ipnlocal+
+        hash/adler32                                                 from tailscale.com/ipn/ipnlocal
         hash/crc32                                                   from compress/gzip+
         hash/fnv                                                     from tailscale.com/wgengine/magicsock+
         hash/maphash                                                 from go4.org/mem
@@ -463,7 +446,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         io/fs                                                        from crypto/x509+
         io/ioutil                                                    from github.com/godbus/dbus/v5+
         log                                                          from expvar+
-        log/internal                                                 from log
   LD    log/syslog                                                   from tailscale.com/ssh/tailssh
         math                                                         from compress/flate+
         math/big                                                     from crypto/dsa+

cmd/testwrapper/flakytest/flakytest.go

@@ -7,20 +7,16 @@
 package flakytest
 
 import (
-	"fmt"
 	"os"
 	"regexp"
 	"testing"
 )
 
-// FlakyTestLogMessage is a sentinel value that is printed to stderr when a
-// flaky test is marked. This is used by cmd/testwrapper to detect flaky tests
-// and retry them.
-const FlakyTestLogMessage = "flakytest: this is a known flaky test"
-
-// FlakeAttemptEnv is an environment variable that is set by cmd/testwrapper
-// when a flaky test is retried. It contains the attempt number, starting at 1.
-const FlakeAttemptEnv = "TS_TESTWRAPPER_ATTEMPT"
+// InTestWrapper returns whether or not this binary is running under our test
+// wrapper.
+func InTestWrapper() bool {
+	return os.Getenv("TS_IN_TESTWRAPPER") != ""
+}
 
 var issueRegexp = regexp.MustCompile(`\Ahttps://github\.com/tailscale/[a-zA-Z0-9_.-]+/issues/\d+\z`)
 
@@ -34,6 +30,16 @@ func Mark(t testing.TB, issue string) {
 		t.Fatalf("bad issue format: %q", issue)
 	}
 
-	fmt.Fprintln(os.Stderr, FlakyTestLogMessage) // sentinel value for testwrapper
-	t.Logf("flakytest: issue tracking this flaky test: %s", issue)
+	if !InTestWrapper() {
+		return
+	}
+
+	t.Cleanup(func() {
+		if t.Failed() {
+			t.Logf("flakytest: signaling test wrapper to retry test")
+
+			// Signal to test wrapper that we should restart.
+			os.Exit(123)
+		}
+	})
 }

cmd/testwrapper/flakytest/flakytest_test.go

@@ -3,10 +3,7 @@
 
 package flakytest
 
-import (
-	"os"
-	"testing"
-)
+import "testing"
 
 func TestIssueFormat(t *testing.T) {
 	testCases := []struct {
@@ -27,17 +24,3 @@ func TestIssueFormat(t *testing.T) {
 		}
 	}
 }
-
-// TestFlakeRun is a test that fails when run in the testwrapper
-// for the first time, but succeeds on the second run.
-// It's used to test whether the testwrapper retries flaky tests.
-func TestFlakeRun(t *testing.T) {
-	Mark(t, "https://github.com/tailscale/tailscale/issues/0") // random issue
-	e := os.Getenv(FlakeAttemptEnv)
-	if e == "" {
-		t.Skip("not running in testwrapper")
-	}
-	if e == "1" {
-		t.Fatal("First run in testwrapper, failing so that test is retried. This is expected.")
-	}
-}

cmd/testwrapper/testwrapper.go

@@ -1,278 +1,62 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
-// testwrapper is a wrapper for retrying flaky tests. It is an alternative to
-// `go test` and re-runs failed marked flaky tests (using the flakytest pkg). It
-// takes different arguments than go test and requires the first positional
-// argument to be the pattern to test.
+// testwrapper is a wrapper for retrying flaky tests, using the -exec flag of
+// 'go test'. Tests that are flaky can use the 'flakytest' subpackage to mark
+// themselves as flaky and be retried on failure.
 package main
 
 import (
-	"bytes"
 	"context"
-	"encoding/json"
 	"errors"
-	"flag"
-	"fmt"
-	"io"
 	"log"
 	"os"
 	"os/exec"
-	"sort"
-	"strings"
-	"time"
-
-	"golang.org/x/exp/maps"
-	"tailscale.com/cmd/testwrapper/flakytest"
 )
 
-const maxAttempts = 3
-
-type testAttempt struct {
-	name          testName
-	outcome       string // "pass", "fail", "skip"
-	logs          bytes.Buffer
-	isMarkedFlaky bool // set if the test is marked as flaky
-
-	pkgFinished bool
-}
-
-type testName struct {
-	pkg  string // "tailscale.com/types/key"
-	name string // "TestFoo"
-}
-
-type packageTests struct {
-	// pattern is the package pattern to run.
-	// Must be a single pattern, not a list of patterns.
-	pattern string // "./...", "./types/key"
-	// tests is a list of tests to run. If empty, all tests in the package are
-	// run.
-	tests []string // ["TestFoo", "TestBar"]
-}
-
-type goTestOutput struct {
-	Time    time.Time
-	Action  string
-	Package string
-	Test    string
-	Output  string
-}
-
-var debug = os.Getenv("TS_TESTWRAPPER_DEBUG") != ""
-
-// runTests runs the tests in pt and sends the results on ch. It sends a
-// testAttempt for each test and a final testAttempt per pkg with pkgFinished
-// set to true.
-// It calls close(ch) when it's done.
-func runTests(ctx context.Context, attempt int, pt *packageTests, otherArgs []string, ch chan<- *testAttempt) {
-	defer close(ch)
-	args := []string{"test", "-json", pt.pattern}
-	args = append(args, otherArgs...)
-	if len(pt.tests) > 0 {
-		runArg := strings.Join(pt.tests, "|")
-		args = append(args, "-run", runArg)
-	}
-	if debug {
-		fmt.Println("running", strings.Join(args, " "))
-	}
-	cmd := exec.CommandContext(ctx, "go", args...)
-	r, err := cmd.StdoutPipe()
-	if err != nil {
-		log.Printf("error creating stdout pipe: %v", err)
-	}
-	cmd.Stderr = os.Stderr
-
-	cmd.Env = os.Environ()
-	cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%d", flakytest.FlakeAttemptEnv, attempt))
-
-	if err := cmd.Start(); err != nil {
-		log.Printf("error starting test: %v", err)
-		os.Exit(1)
-	}
-	done := make(chan struct{})
-	go func() {
-		defer close(done)
-		cmd.Wait()
-	}()
-
-	jd := json.NewDecoder(r)
-	resultMap := make(map[testName]*testAttempt)
-	for {
-		var goOutput goTestOutput
-		if err := jd.Decode(&goOutput); err != nil {
-			if errors.Is(err, io.EOF) || errors.Is(err, os.ErrClosed) {
-				break
-			}
-			panic(err)
-		}
-		if goOutput.Test == "" {
-			switch goOutput.Action {
-			case "fail", "pass", "skip":
-				ch <- &testAttempt{
-					name: testName{
-						pkg: goOutput.Package,
-					},
-					outcome:     goOutput.Action,
-					pkgFinished: true,
-				}
-			}
-			continue
-		}
-		name := testName{
-			pkg:  goOutput.Package,
-			name: goOutput.Test,
-		}
-		if test, _, isSubtest := strings.Cut(goOutput.Test, "/"); isSubtest {
-			name.name = test
-			if goOutput.Action == "output" {
-				resultMap[name].logs.WriteString(goOutput.Output)
-			}
-			continue
-		}
-		switch goOutput.Action {
-		case "start":
-			// ignore
-		case "run":
-			resultMap[name] = &testAttempt{
-				name: name,
-			}
-		case "skip", "pass", "fail":
-			resultMap[name].outcome = goOutput.Action
-			ch <- resultMap[name]
-		case "output":
-			if strings.TrimSpace(goOutput.Output) == flakytest.FlakyTestLogMessage {
-				resultMap[name].isMarkedFlaky = true
-			} else {
-				resultMap[name].logs.WriteString(goOutput.Output)
-			}
-		}
-	}
-	<-done
-}
+const (
+	retryStatus   = 123
+	maxIterations = 3
+)
 
 func main() {
 	ctx := context.Background()
+	debug := os.Getenv("TS_TESTWRAPPER_DEBUG") != ""
 
-	// We only need to parse the -v flag to figure out whether to print the logs
-	// for a test. We don't need to parse any other flags, so we just use the
-	// flag package to parse the -v flag and then pass the rest of the args
-	// through to 'go test'.
-	// We run `go test -json` which returns the same information as `go test -v`,
-	// but in a machine-readable format. So this flag is only for testwrapper's
-	// output.
-	v := flag.Bool("v", false, "verbose")
-
-	flag.Usage = func() {
-		fmt.Println("usage: testwrapper [testwrapper-flags] [pattern] [build/test flags & test binary flags]")
-		fmt.Println()
-		fmt.Println("testwrapper-flags:")
-		flag.CommandLine.PrintDefaults()
-		fmt.Println()
-		fmt.Println("examples:")
-		fmt.Println("\ttestwrapper -v ./... -count=1")
-		fmt.Println("\ttestwrapper ./pkg/foo -run TestBar -count=1")
-		fmt.Println()
-		fmt.Println("Unlike 'go test', testwrapper requires a package pattern as the first positional argument and only supports a single pattern.")
-	}
-	flag.Parse()
-
-	args := flag.Args()
-	if len(args) < 1 || strings.HasPrefix(args[0], "-") {
-		fmt.Println("no pattern specified")
-		flag.Usage()
-		os.Exit(1)
-	} else if len(args) > 1 && !strings.HasPrefix(args[1], "-") {
-		fmt.Println("expected single pattern")
-		flag.Usage()
-		os.Exit(1)
-	}
-	pattern, otherArgs := args[0], args[1:]
-
-	type nextRun struct {
-		tests   []*packageTests
-		attempt int
+	log.SetPrefix("testwrapper: ")
+	if !debug {
+		log.SetFlags(0)
 	}
 
-	toRun := []*nextRun{
-		{
-			tests:   []*packageTests{{pattern: pattern}},
-			attempt: 1,
-		},
-	}
-	printPkgOutcome := func(pkg, outcome string, attempt int) {
-		if outcome == "skip" {
-			fmt.Printf("?\t%s [skipped/no tests] \n", pkg)
+	for i := 1; i <= maxIterations; i++ {
+		if i > 1 {
+			log.Printf("retrying flaky tests (%d of %d)", i, maxIterations)
+		}
+		cmd := exec.CommandContext(ctx, os.Args[1], os.Args[2:]...)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		cmd.Env = append(os.Environ(), "TS_IN_TESTWRAPPER=1")
+		err := cmd.Run()
+		if err == nil {
 			return
 		}
-		if outcome == "pass" {
-			outcome = "ok"
-		}
-		if outcome == "fail" {
-			outcome = "FAIL"
-		}
-		if attempt > 1 {
-			fmt.Printf("%s\t%s [attempt=%d]\n", outcome, pkg, attempt)
-			return
-		}
-		fmt.Printf("%s\t%s\n", outcome, pkg)
-	}
 
-	for len(toRun) > 0 {
-		var thisRun *nextRun
-		thisRun, toRun = toRun[0], toRun[1:]
-
-		if thisRun.attempt >= maxAttempts {
-			fmt.Println("max attempts reached")
-			os.Exit(1)
-		}
-		if thisRun.attempt > 1 {
-			fmt.Printf("\n\nAttempt #%d: Retrying flaky tests:\n\n", thisRun.attempt)
-		}
-
-		failed := false
-		toRetry := make(map[string][]string) // pkg -> tests to retry
-		for _, pt := range thisRun.tests {
-			ch := make(chan *testAttempt)
-			go runTests(ctx, thisRun.attempt, pt, otherArgs, ch)
-			for tr := range ch {
-				if tr.pkgFinished {
-					printPkgOutcome(tr.name.pkg, tr.outcome, thisRun.attempt)
-					continue
-				}
-				if *v || tr.outcome == "fail" {
-					io.Copy(os.Stdout, &tr.logs)
-				}
-				if tr.outcome != "fail" {
-					continue
-				}
-				if tr.isMarkedFlaky {
-					toRetry[tr.name.pkg] = append(toRetry[tr.name.pkg], tr.name.name)
-				} else {
-					failed = true
-				}
+		var exitErr *exec.ExitError
+		if !errors.As(err, &exitErr) {
+			if debug {
+				log.Printf("error isn't an ExitError")
 			}
-		}
-		if failed {
-			fmt.Println("\n\nNot retrying flaky tests because non-flaky tests failed.")
 			os.Exit(1)
 		}
-		if len(toRetry) == 0 {
-			continue
+
+		if code := exitErr.ExitCode(); code != retryStatus {
+			if debug {
+				log.Printf("code (%d) != retryStatus (%d)", code, retryStatus)
+			}
+			os.Exit(code)
 		}
-		pkgs := maps.Keys(toRetry)
-		sort.Strings(pkgs)
-		nextRun := &nextRun{
-			attempt: thisRun.attempt + 1,
-		}
-		for _, pkg := range pkgs {
-			tests := toRetry[pkg]
-			sort.Strings(tests)
-			nextRun.tests = append(nextRun.tests, &packageTests{
-				pattern: pkg,
-				tests:   tests,
-			})
-		}
-		toRun = append(toRun, nextRun)
 	}
+
+	log.Printf("test did not pass in %d iterations", maxIterations)
+	os.Exit(1)
 }

control/controlclient/debug.go

@@ -20,7 +20,7 @@ func dumpGoroutinesToURL(c *http.Client, targetURL string) {
 
 	zbuf := new(bytes.Buffer)
 	zw := gzip.NewWriter(zbuf)
-	zw.Write(goroutines.ScrubbedGoroutineDump(true))
+	zw.Write(goroutines.ScrubbedGoroutineDump())
 	zw.Close()
 
 	req, err := http.NewRequestWithContext(ctx, "PUT", targetURL, zbuf)

control/controlclient/noise.go

@@ -287,25 +287,6 @@ func (nc *NoiseClient) GetSingleUseRoundTripper(ctx context.Context) (http.Round
 	return nil, nil, errors.New("[unexpected] failed to reserve a request on a connection")
 }
 
-// contextErr is an error that wraps another error and is used to indicate that
-// the error was because a context expired.
-type contextErr struct {
-	err error
-}
-
-func (e contextErr) Error() string {
-	return e.err.Error()
-}
-
-func (e contextErr) Unwrap() error {
-	return e.err
-}
-
-// getConn returns a noiseConn that can be used to make requests to the
-// coordination server. It may return a cached connection or create a new one.
-// Dials are singleflighted, so concurrent calls to getConn may only dial once.
-// As such, context values may not be respected as there are no guarantees that
-// the context passed to getConn is the same as the context passed to dial.
 func (nc *NoiseClient) getConn(ctx context.Context) (*noiseConn, error) {
 	nc.mu.Lock()
 	if last := nc.last; last != nil && last.canTakeNewRequest() {
@@ -314,35 +295,11 @@ func (nc *NoiseClient) getConn(ctx context.Context) (*noiseConn, error) {
 	}
 	nc.mu.Unlock()
 
-	for {
-		// We singeflight the dial to avoid making multiple connections, however
-		// that means that we can't simply cancel the dial if the context is
-		// canceled. Instead, we have to additionally check that the context
-		// which was canceled is our context and retry if our context is still
-		// valid.
-		conn, err, _ := nc.sfDial.Do(struct{}{}, func() (*noiseConn, error) {
-			c, err := nc.dial(ctx)
-			if err != nil {
-				if ctx.Err() != nil {
-					return nil, contextErr{ctx.Err()}
-				}
-				return nil, err
-			}
-			return c, nil
-		})
-		var ce contextErr
-		if err == nil || !errors.As(err, &ce) {
-			return conn, err
-		}
-		if ctx.Err() == nil {
-			// The dial failed because of a context error, but our context
-			// is still valid. Retry.
-			continue
-		}
-		// The dial failed because our context was canceled. Return the
-		// underlying error.
-		return nil, ce.Unwrap()
+	conn, err, _ := nc.sfDial.Do(struct{}{}, nc.dial)
+	if err != nil {
+		return nil, err
 	}
+	return conn, nil
 }
 
 func (nc *NoiseClient) RoundTrip(req *http.Request) (*http.Response, error) {
@@ -387,7 +344,7 @@ func (nc *NoiseClient) Close() error {
 
 // dial opens a new connection to tailcontrol, fetching the server noise key
 // if not cached.
-func (nc *NoiseClient) dial(ctx context.Context) (*noiseConn, error) {
+func (nc *NoiseClient) dial() (*noiseConn, error) {
 	nc.mu.Lock()
 	connID := nc.nextID
 	nc.nextID++
@@ -435,7 +392,7 @@ func (nc *NoiseClient) dial(ctx context.Context) (*noiseConn, error) {
 	}
 
 	timeout := time.Duration(timeoutSec * float64(time.Second))
-	ctx, cancel := context.WithTimeout(ctx, timeout)
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
 	defer cancel()
 
 	clientConn, err := (&controlhttp.Dialer{

control/controlhttp/http_test.go

@@ -583,20 +583,19 @@ func TestDialPlan(t *testing.T) {
 			}},
 			want: goodAddr,
 		},
-		// TODO(#8442): fix this test
-		// {
-		// 	name: "multiple-priority-fast-path",
-		// 	plan: &tailcfg.ControlDialPlan{Candidates: []tailcfg.ControlIPCandidate{
-		// 		// Dials some good IPs and our bad one (which
-		// 		// hangs forever), which then hits the fast
-		// 		// path where we bail without waiting.
-		// 		{IP: brokenAddr, Priority: 1, DialTimeoutSec: 10},
-		// 		{IP: goodAddr, Priority: 1, DialTimeoutSec: 10},
-		// 		{IP: other2Addr, Priority: 1, DialTimeoutSec: 10},
-		// 		{IP: otherAddr, Priority: 2, DialTimeoutSec: 10},
-		// 	}},
-		// 	want: otherAddr,
-		// },
+		{
+			name: "multiple-priority-fast-path",
+			plan: &tailcfg.ControlDialPlan{Candidates: []tailcfg.ControlIPCandidate{
+				// Dials some good IPs and our bad one (which
+				// hangs forever), which then hits the fast
+				// path where we bail without waiting.
+				{IP: brokenAddr, Priority: 1, DialTimeoutSec: 10},
+				{IP: goodAddr, Priority: 1, DialTimeoutSec: 10},
+				{IP: other2Addr, Priority: 1, DialTimeoutSec: 10},
+				{IP: otherAddr, Priority: 2, DialTimeoutSec: 10},
+			}},
+			want: otherAddr,
+		},
 		{
 			name: "multiple-priority-slow-path",
 			plan: &tailcfg.ControlDialPlan{Candidates: []tailcfg.ControlIPCandidate{

derp/derp_server_linux.go

@@ -9,18 +9,19 @@ import (
 	"net"
 	"time"
 
-	"tailscale.com/net/tcpinfo"
+	"golang.org/x/sys/unix"
 )
 
 func (c *sclient) statsLoop(ctx context.Context) error {
-	// Get the RTT initially to verify it's supported.
-	conn := c.tcpConn()
-	if conn == nil {
+	// If we can't get a TCP socket, then we can't send stats.
+	tcpConn := c.tcpConn()
+	if tcpConn == nil {
 		c.s.tcpRtt.Add("non-tcp", 1)
 		return nil
 	}
-	if _, err := tcpinfo.RTT(conn); err != nil {
-		c.logf("error fetching initial RTT: %v", err)
+	rawConn, err := tcpConn.SyscallConn()
+	if err != nil {
+		c.logf("error getting SyscallConn: %v", err)
 		c.s.tcpRtt.Add("error", 1)
 		return nil
 	}
@@ -30,16 +31,23 @@ func (c *sclient) statsLoop(ctx context.Context) error {
 	ticker := time.NewTicker(statsInterval)
 	defer ticker.Stop()
 
+	var (
+		tcpInfo *unix.TCPInfo
+		sysErr  error
+	)
 statsLoop:
 	for {
 		select {
 		case <-ticker.C:
-			rtt, err := tcpinfo.RTT(conn)
-			if err != nil {
+			err = rawConn.Control(func(fd uintptr) {
+				tcpInfo, sysErr = unix.GetsockoptTCPInfo(int(fd), unix.IPPROTO_TCP, unix.TCP_INFO)
+			})
+			if err != nil || sysErr != nil {
 				continue statsLoop
 			}
 
 			// TODO(andrew): more metrics?
+			rtt := time.Duration(tcpInfo.Rtt) * time.Microsecond
 			c.s.tcpRtt.Add(durationToLabel(rtt), 1)
 
 		case <-ctx.Done():

docs/k8s/Makefile

@@ -6,20 +6,22 @@ SA_NAME ?= tailscale
 TS_KUBE_SECRET ?= tailscale
 
 rbac:
-	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" role.yaml
-	@echo "---"
-	@sed -e "s;{{SA_NAME}};$(SA_NAME);g" rolebinding.yaml
-	@echo "---"
-	@sed -e "s;{{SA_NAME}};$(SA_NAME);g" sa.yaml
+	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" role.yaml | kubectl apply -f -
+	@sed -e "s;{{SA_NAME}};$(SA_NAME);g" rolebinding.yaml | kubectl apply -f -
+	@sed -e "s;{{SA_NAME}};$(SA_NAME);g" sa.yaml | kubectl apply -f -
 
 sidecar:
-	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" sidecar.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g"
+	@kubectl delete -f sidecar.yaml --ignore-not-found --grace-period=0
+	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" sidecar.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | kubectl create -f-
 
 userspace-sidecar:
-	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" userspace-sidecar.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g"
+	@kubectl delete -f userspace-sidecar.yaml --ignore-not-found --grace-period=0
+	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" userspace-sidecar.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | kubectl create -f-
 
 proxy:
-	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" proxy.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{TS_DEST_IP}};$(TS_DEST_IP);g"
+	kubectl delete -f proxy.yaml --ignore-not-found --grace-period=0
+	sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" proxy.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{TS_DEST_IP}};$(TS_DEST_IP);g" | kubectl create -f-
 
 subnet-router:
-	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" subnet.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{TS_ROUTES}};$(TS_ROUTES);g"
+	@kubectl delete -f subnet.yaml --ignore-not-found --grace-period=0
+	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" subnet.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{TS_ROUTES}};$(TS_ROUTES);g" | kubectl create -f-

docs/k8s/README.md

@@ -26,7 +26,7 @@ There are quite a few ways of running Tailscale inside a Kubernetes Cluster, som
    ```bash
    export SA_NAME=tailscale
    export TS_KUBE_SECRET=tailscale-auth
-   make rbac | kubectl apply -f-
+   make rbac
    ```
 
 ### Sample Sidecar
@@ -36,7 +36,7 @@ Running as a sidecar allows you to directly expose a Kubernetes pod over Tailsca
 1. Create and login to the sample nginx pod with a Tailscale sidecar
 
    ```bash
-   make sidecar | kubectl apply -f-
+   make sidecar
    # If not using an auth key, authenticate by grabbing the Login URL here:
    kubectl logs nginx ts-sidecar
    ```
@@ -60,7 +60,7 @@ You can also run the sidecar in userspace mode. The obvious benefit is reducing
 1. Create and login to the sample nginx pod with a Tailscale sidecar
 
    ```bash
-   make userspace-sidecar | kubectl apply -f-
+   make userspace-sidecar
    # If not using an auth key, authenticate by grabbing the Login URL here:
    kubectl logs nginx ts-sidecar
    ```
@@ -100,7 +100,7 @@ Running a Tailscale proxy allows you to provide inbound connectivity to a Kubern
 1. Deploy the proxy pod
 
    ```bash
-   make proxy | kubectl apply -f-
+   make proxy
    # If not using an auth key, authenticate by grabbing the Login URL here:
    kubectl logs proxy
    ```
@@ -133,7 +133,7 @@ the entire Kubernetes cluster network (assuming NetworkPolicies allow) over Tail
 1. Deploy the subnet-router pod.
 
    ```bash
-   make subnet-router | kubectl apply -f-
+   make subnet-router
    # If not using an auth key, authenticate by grabbing the Login URL here:
    kubectl logs subnet-router
    ```

flake.nix

@@ -115,4 +115,4 @@
   in
     flake-utils.lib.eachDefaultSystem (system: flakeForSystem nixpkgs system);
 }
-# nix-direnv cache busting line: sha256-fgCrmtJs1svFz0Xn7iwLNrbBNlcO6V0yqGPMY0+V1VQ=
+# nix-direnv cache busting line: sha256-l2uIma2oEdSN0zVo9BOFJF2gC3S60vXwTLVadv8yQPo=

go.mod

@@ -48,7 +48,7 @@ require (
 	github.com/mdlayher/genetlink v1.3.2
 	github.com/mdlayher/netlink v1.7.2
 	github.com/mdlayher/sdnotify v1.0.0
-	github.com/miekg/dns v1.1.55
+	github.com/miekg/dns v1.1.54
 	github.com/mitchellh/go-ps v1.0.0
 	github.com/peterbourgon/ff/v3 v3.3.0
 	github.com/pkg/errors v0.9.1
@@ -79,7 +79,7 @@ require (
 	golang.org/x/net v0.10.0
 	golang.org/x/oauth2 v0.7.0
 	golang.org/x/sync v0.2.0
-	golang.org/x/sys v0.8.1-0.20230609144347-5059a07aa46a
+	golang.org/x/sys v0.8.0
 	golang.org/x/term v0.8.0
 	golang.org/x/time v0.3.0
 	golang.org/x/tools v0.9.1

go.mod.sri

@@ -1 +1 @@
-sha256-fgCrmtJs1svFz0Xn7iwLNrbBNlcO6V0yqGPMY0+V1VQ=
+sha256-l2uIma2oEdSN0zVo9BOFJF2gC3S60vXwTLVadv8yQPo=

go.sum

@@ -767,8 +767,8 @@ github.com/mdlayher/socket v0.4.1/go.mod h1:cAqeGjoufqdxWkD7DkpyS+wcefOtmu5OQ8Ku
 github.com/mgechev/revive v1.3.1 h1:OlQkcH40IB2cGuprTPcjB0iIUddgVZgGmDX3IAMR8D4=
 github.com/mgechev/revive v1.3.1/go.mod h1:YlD6TTWl2B8A103R9KWJSPVI9DrEf+oqr15q21Ld+5I=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
-github.com/miekg/dns v1.1.55 h1:GoQ4hpsj0nFLYe+bWiCToyrBEJXkQfOOIvFGFy0lEgo=
-github.com/miekg/dns v1.1.55/go.mod h1:uInx36IzPl7FYnDcMeVWxj9byh7DutNykX4G9Sj60FY=
+github.com/miekg/dns v1.1.54 h1:5jon9mWcb0sFJGpnI99tOMhCPyJ+RPVz5b63MQG0VWI=
+github.com/miekg/dns v1.1.54/go.mod h1:uInx36IzPl7FYnDcMeVWxj9byh7DutNykX4G9Sj60FY=
 github.com/mitchellh/cli v1.0.0/go.mod h1:hNIlj7HEI86fIcpObd7a0FcrxTWetlwJDGcceTlRvqc=
 github.com/mitchellh/copystructure v1.0.0/go.mod h1:SNtv71yrdKgLRyLFxmLdkAbkKEFWgYaq1OVrnRcwhnw=
 github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
@@ -1432,8 +1432,8 @@ golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.4.1-0.20230131160137-e7d7f63158de/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.8.1-0.20230609144347-5059a07aa46a h1:qMsju+PNttu/NMbq8bQ9waDdxgJMu9QNoUDuhnBaYt0=
-golang.org/x/sys v0.8.1-0.20230609144347-5059a07aa46a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=

go.toolchain.branch

@@ -1 +1 @@
-tailscale.go1.21
+tailscale.go1.20

go.toolchain.rev

@@ -1 +1 @@
-492f6d9d792fa6e4caa388e4d7bab46b48d07ad5
+40dc4d834a5fde9872bcf470be50069f56c3e3b3

hostinfo/hostinfo.go

@@ -7,10 +7,8 @@ package hostinfo
 
 import (
 	"bufio"
-	"bytes"
 	"io"
 	"os"
-	"os/exec"
 	"runtime"
 	"runtime/debug"
 	"strings"
@@ -283,7 +281,7 @@ func inContainer() opt.Bool {
 		return nil
 	})
 	lineread.File("/proc/mounts", func(line []byte) error {
-		if mem.Contains(mem.B(line), mem.S("lxcfs /proc/cpuinfo fuse.lxcfs")) {
+		if mem.Contains(mem.B(line), mem.S("fuse.lxcfs")) {
 			ret.Set(true)
 			return io.EOF
 		}
@@ -436,12 +434,3 @@ func etcAptSourceFileIsDisabled(r io.Reader) bool {
 	}
 	return disabled
 }
-
-// IsSELinuxEnforcing reports whether SELinux is in "Enforcing" mode.
-func IsSELinuxEnforcing() bool {
-	if runtime.GOOS != "linux" {
-		return false
-	}
-	out, _ := exec.Command("getenforce").Output()
-	return string(bytes.TrimSpace(out)) == "Enforcing"
-}

ipn/ipn_clone.go

@@ -103,7 +103,6 @@ func (src *TCPPortHandler) Clone() *TCPPortHandler {
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _TCPPortHandlerCloneNeedsRegeneration = TCPPortHandler(struct {
 	HTTPS        bool
-	HTTP         bool
 	TCPForward   string
 	TerminateTLS string
 }{})

ipn/ipn_view.go

@@ -228,14 +228,12 @@ func (v *TCPPortHandlerView) UnmarshalJSON(b []byte) error {
 }
 
 func (v TCPPortHandlerView) HTTPS() bool          { return v.ж.HTTPS }
-func (v TCPPortHandlerView) HTTP() bool           { return v.ж.HTTP }
 func (v TCPPortHandlerView) TCPForward() string   { return v.ж.TCPForward }
 func (v TCPPortHandlerView) TerminateTLS() string { return v.ж.TerminateTLS }
 
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _TCPPortHandlerViewNeedsRegeneration = TCPPortHandler(struct {
 	HTTPS        bool
-	HTTP         bool
 	TCPForward   string
 	TerminateTLS string
 }{})

ipn/ipnlocal/c2n.go

@@ -49,7 +49,7 @@ func (b *LocalBackend) handleC2N(w http.ResponseWriter, r *http.Request) {
 		}
 	case "/debug/goroutines":
 		w.Header().Set("Content-Type", "text/plain")
-		w.Write(goroutines.ScrubbedGoroutineDump(true))
+		w.Write(goroutines.ScrubbedGoroutineDump())
 	case "/debug/prefs":
 		writeJSON(b.Prefs())
 	case "/debug/metrics":

ipn/ipnlocal/local.go

@@ -4,6 +4,7 @@
 package ipnlocal
 
 import (
+	"bytes"
 	"context"
 	"encoding/base64"
 	"encoding/json"
@@ -17,6 +18,7 @@ import (
 	"net/netip"
 	"net/url"
 	"os"
+	"os/exec"
 	"os/user"
 	"path/filepath"
 	"runtime"
@@ -30,7 +32,6 @@ import (
 	"go4.org/mem"
 	"go4.org/netipx"
 	"golang.org/x/exp/slices"
-	"gvisor.dev/gvisor/pkg/tcpip"
 	"tailscale.com/client/tailscale/apitype"
 	"tailscale.com/control/controlclient"
 	"tailscale.com/doctor"
@@ -742,6 +743,7 @@ func (b *LocalBackend) populatePeerStatusLocked(sb *ipnstate.StatusBuilder) {
 			HostName:     p.Hostinfo.Hostname(),
 			DNSName:      p.Name,
 			OS:           p.Hostinfo.OS(),
+			KeepAlive:    p.KeepAlive,
 			LastSeen:     lastSeen,
 			Online:       p.Online != nil && *p.Online,
 			ShareeNode:   p.Hostinfo.ShareeNode(),
@@ -2580,7 +2582,7 @@ func (b *LocalBackend) checkSSHPrefsLocked(p *ipn.Prefs) error {
 		if distro.Get() == distro.QNAP && !envknob.UseWIPCode() {
 			return errors.New("The Tailscale SSH server does not run on QNAP.")
 		}
-		b.updateSELinuxHealthWarning()
+		checkSELinux()
 		// otherwise okay
 	case "darwin":
 		// okay only in tailscaled mode for now.
@@ -2826,14 +2828,14 @@ func (b *LocalBackend) GetPeerAPIPort(ip netip.Addr) (port uint16, ok bool) {
 	return 0, false
 }
 
-// handlePeerAPIConn serves an already-accepted connection c.
+// ServePeerAPIConnection serves an already-accepted connection c.
 //
 // The remote parameter is the remote address.
 // The local parameter is the local address (either a Tailscale IPv4
 // or IPv6 IP and the peerapi port for that address).
 //
-// The connection will be closed by handlePeerAPIConn.
-func (b *LocalBackend) handlePeerAPIConn(remote, local netip.AddrPort, c net.Conn) {
+// The connection will be closed by ServePeerAPIConnection.
+func (b *LocalBackend) ServePeerAPIConnection(remote, local netip.AddrPort, c net.Conn) {
 	b.mu.Lock()
 	defer b.mu.Unlock()
 	for _, pln := range b.peerAPIListeners {
@@ -2847,48 +2849,6 @@ func (b *LocalBackend) handlePeerAPIConn(remote, local netip.AddrPort, c net.Con
 	return
 }
 
-func (b *LocalBackend) isLocalIP(ip netip.Addr) bool {
-	nm := b.NetMap()
-	return nm != nil && slices.Contains(nm.Addresses, netip.PrefixFrom(ip, ip.BitLen()))
-}
-
-var (
-	magicDNSIP   = tsaddr.TailscaleServiceIP()
-	magicDNSIPv6 = tsaddr.TailscaleServiceIPv6()
-)
-
-// TCPHandlerForDst returns a TCP handler for connections to dst, or nil if
-// no handler is needed. It also returns a list of TCP socket options to
-// apply to the socket before calling the handler.
-func (b *LocalBackend) TCPHandlerForDst(src, dst netip.AddrPort) (handler func(c net.Conn) error, opts []tcpip.SettableSocketOption) {
-	if dst.Port() == 80 && (dst.Addr() == magicDNSIP || dst.Addr() == magicDNSIPv6) {
-		return b.HandleQuad100Port80Conn, opts
-	}
-	if !b.isLocalIP(dst.Addr()) {
-		return nil, nil
-	}
-	if dst.Port() == 22 && b.ShouldRunSSH() {
-		// Use a higher keepalive idle time for SSH connections, as they are
-		// typically long lived and idle connections are more likely to be
-		// intentional. Ideally we would turn this off entirely, but we can't
-		// tell the difference between a long lived connection that is idle
-		// vs a connection that is dead because the peer has gone away.
-		// We pick 72h as that is typically sufficient for a long weekend.
-		opts = append(opts, ptr.To(tcpip.KeepaliveIdleOption(72*time.Hour)))
-		return b.handleSSHConn, opts
-	}
-	if port, ok := b.GetPeerAPIPort(dst.Addr()); ok && dst.Port() == port {
-		return func(c net.Conn) error {
-			b.handlePeerAPIConn(src, dst, c)
-			return nil
-		}, opts
-	}
-	if handler := b.tcpHandlerForServe(dst.Port(), src); handler != nil {
-		return handler, opts
-	}
-	return nil, nil
-}
-
 func (b *LocalBackend) peerAPIServicesLocked() (ret []tailcfg.Service) {
 	for _, pln := range b.peerAPIListeners {
 		proto := tailcfg.PeerAPI4
@@ -4128,10 +4088,6 @@ func (b *LocalBackend) setServeProxyHandlersLocked() {
 	b.serveConfig.Web().Range(func(_ ipn.HostPort, conf ipn.WebServerConfigView) (cont bool) {
 		conf.Handlers().Range(func(_ string, h ipn.HTTPHandlerView) (cont bool) {
 			backend := h.Proxy()
-			if backend == "" {
-				// Only create proxy handlers for servers with a proxy backend.
-				return true
-			}
 			mak.Set(&backends, backend, true)
 			if _, ok := b.serveProxyHandlers.Load(backend); ok {
 				return true
@@ -4706,29 +4662,33 @@ func (b *LocalBackend) sshServerOrInit() (_ SSHServer, err error) {
 
 var warnSSHSELinux = health.NewWarnable()
 
-func (b *LocalBackend) updateSELinuxHealthWarning() {
-	if hostinfo.IsSELinuxEnforcing() {
+func checkSELinux() {
+	if runtime.GOOS != "linux" {
+		return
+	}
+	out, _ := exec.Command("getenforce").Output()
+	if string(bytes.TrimSpace(out)) == "Enforcing" {
 		warnSSHSELinux.Set(errors.New("SELinux is enabled; Tailscale SSH may not work. See https://tailscale.com/s/ssh-selinux"))
 	} else {
 		warnSSHSELinux.Set(nil)
 	}
 }
 
-func (b *LocalBackend) handleSSHConn(c net.Conn) (err error) {
+func (b *LocalBackend) HandleSSHConn(c net.Conn) (err error) {
 	s, err := b.sshServerOrInit()
 	if err != nil {
 		return err
 	}
-	b.updateSELinuxHealthWarning()
+	checkSELinux()
 	return s.HandleSSHConn(c)
 }
 
 // HandleQuad100Port80Conn serves http://100.100.100.100/ on port 80 (and
 // the equivalent tsaddr.TailscaleServiceIPv6 address).
-func (b *LocalBackend) HandleQuad100Port80Conn(c net.Conn) error {
+func (b *LocalBackend) HandleQuad100Port80Conn(c net.Conn) {
 	var s http.Server
 	s.Handler = http.HandlerFunc(b.handleQuad100Port80Conn)
-	return s.Serve(netutil.NewOneConnListener(c, nil))
+	s.Serve(netutil.NewOneConnListener(c, nil))
 }
 
 func validQuad100Host(h string) bool {

ipn/ipnlocal/network-lock.go

@@ -158,9 +158,7 @@ func (b *LocalBackend) tkaSyncIfNeeded(nm *netmap.NetworkMap, prefs ipn.PrefsVie
 		return nil
 	}
 
-	if b.tka != nil || nm.TKAEnabled {
-		b.logf("tkaSyncIfNeeded: enabled=%v, head=%v", nm.TKAEnabled, nm.TKAHead)
-	}
+	b.logf("tkaSyncIfNeeded: enabled=%v, head=%v", nm.TKAEnabled, nm.TKAHead)
 
 	ourNodeKey := prefs.Persist().PublicNodeKey()
 
@@ -199,7 +197,7 @@ func (b *LocalBackend) tkaSyncIfNeeded(nm *netmap.NetworkMap, prefs ipn.PrefsVie
 				health.SetTKAHealth(nil)
 			}
 		} else {
-			return fmt.Errorf("[bug] unreachable invariant of wantEnabled w/ isEnabled")
+			return fmt.Errorf("[bug] unreachable invariant of wantEnabled /w isEnabled")
 		}
 	}
 
@@ -889,18 +887,6 @@ func (b *LocalBackend) NetworkLockWrapPreauthKey(preauthKey string, tkaKey key.N
 	return fmt.Sprintf("%s--TL%s-%s", preauthKey, tkaSuffixEncoder.EncodeToString(sig.Serialize()), tkaSuffixEncoder.EncodeToString(priv)), nil
 }
 
-// NetworkLockVerifySigningDeeplink asks the authority to verify the given deeplink
-// URL. See the comment for ValidateDeeplink for details.
-func (b *LocalBackend) NetworkLockVerifySigningDeeplink(url string) tka.DeeplinkValidationResult {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	if b.tka == nil {
-		return tka.DeeplinkValidationResult{IsValid: false, Error: errNetworkLockNotActive.Error()}
-	}
-
-	return b.tka.authority.ValidateDeeplink(url)
-}
-
 func signNodeKey(nodeInfo tailcfg.TKASignInfo, signer key.NLPrivate) (*tka.NodeKeySignature, error) {
 	p, err := nodeInfo.NodePublic.MarshalBinary()
 	if err != nil {

ipn/ipnlocal/peerapi.go

@@ -780,7 +780,7 @@ func (h *peerAPIHandler) handleServeIngress(w http.ResponseWriter, r *http.Reque
 		return
 	}
 
-	getConnOrReset := func() (net.Conn, bool) {
+	getConn := func() (net.Conn, bool) {
 		conn, _, err := w.(http.Hijacker).Hijack()
 		if err != nil {
 			h.logf("ingress: failed hijacking conn")
@@ -798,7 +798,7 @@ func (h *peerAPIHandler) handleServeIngress(w http.ResponseWriter, r *http.Reque
 		http.Error(w, "denied", http.StatusForbidden)
 	}
 
-	h.ps.b.HandleIngressTCPConn(h.peerNode, target, srcAddr, getConnOrReset, sendRST)
+	h.ps.b.HandleIngressTCPConn(h.peerNode, target, srcAddr, getConn, sendRST)
 }
 
 func (h *peerAPIHandler) handleServeInterfaces(w http.ResponseWriter, r *http.Request) {

ipn/ipnlocal/serve.go

@@ -162,13 +162,12 @@ func (s *serveListener) handleServeListenersAccept(ln net.Listener) error {
 			return err
 		}
 		srcAddr := conn.RemoteAddr().(*net.TCPAddr).AddrPort()
-		handler := s.b.tcpHandlerForServe(s.ap.Port(), srcAddr)
-		if handler == nil {
+		getConn := func() (net.Conn, bool) { return conn, true }
+		sendRST := func() {
 			s.b.logf("serve RST for %v", srcAddr)
 			conn.Close()
-			continue
 		}
-		go handler(conn)
+		go s.b.HandleInterceptedTCPConn(s.ap.Port(), srcAddr, getConn, sendRST)
 	}
 }
 
@@ -257,7 +256,7 @@ func (b *LocalBackend) ServeConfig() ipn.ServeConfigView {
 	return b.serveConfig
 }
 
-func (b *LocalBackend) HandleIngressTCPConn(ingressPeer *tailcfg.Node, target ipn.HostPort, srcAddr netip.AddrPort, getConnOrReset func() (net.Conn, bool), sendRST func()) {
+func (b *LocalBackend) HandleIngressTCPConn(ingressPeer *tailcfg.Node, target ipn.HostPort, srcAddr netip.AddrPort, getConn func() (net.Conn, bool), sendRST func()) {
 	b.mu.Lock()
 	sc := b.serveConfig
 	b.mu.Unlock()
@@ -290,7 +289,7 @@ func (b *LocalBackend) HandleIngressTCPConn(ingressPeer *tailcfg.Node, target ip
 	if b.getTCPHandlerForFunnelFlow != nil {
 		handler := b.getTCPHandlerForFunnelFlow(srcAddr, dport)
 		if handler != nil {
-			c, ok := getConnOrReset()
+			c, ok := getConn()
 			if !ok {
 				b.logf("localbackend: getConn didn't complete from %v to port %v", srcAddr, dport)
 				return
@@ -299,41 +298,39 @@ func (b *LocalBackend) HandleIngressTCPConn(ingressPeer *tailcfg.Node, target ip
 			return
 		}
 	}
-	// TODO(bradfitz): pass ingressPeer etc in context to tcpHandlerForServe,
+	// TODO(bradfitz): pass ingressPeer etc in context to HandleInterceptedTCPConn,
 	// extend serveHTTPContext or similar.
-	handler := b.tcpHandlerForServe(dport, srcAddr)
-	if handler == nil {
-		sendRST()
-		return
-	}
-	c, ok := getConnOrReset()
-	if !ok {
-		b.logf("localbackend: getConn didn't complete from %v to port %v", srcAddr, dport)
-		return
-	}
-	handler(c)
+	b.HandleInterceptedTCPConn(dport, srcAddr, getConn, sendRST)
 }
 
-// tcpHandlerForServe returns a handler for a TCP connection to be served via
-// the ipn.ServeConfig.
-func (b *LocalBackend) tcpHandlerForServe(dport uint16, srcAddr netip.AddrPort) (handler func(net.Conn) error) {
+func (b *LocalBackend) HandleInterceptedTCPConn(dport uint16, srcAddr netip.AddrPort, getConn func() (net.Conn, bool), sendRST func()) {
 	b.mu.Lock()
 	sc := b.serveConfig
 	b.mu.Unlock()
 
 	if !sc.Valid() {
 		b.logf("[unexpected] localbackend: got TCP conn w/o serveConfig; from %v to port %v", srcAddr, dport)
-		return nil
+		sendRST()
+		return
 	}
 
 	tcph, ok := sc.TCP().GetOk(dport)
 	if !ok {
 		b.logf("[unexpected] localbackend: got TCP conn without TCP config for port %v; from %v", dport, srcAddr)
-		return nil
+		sendRST()
+		return
 	}
 
-	if tcph.HTTPS() || tcph.HTTP() {
+	if tcph.HTTPS() {
+		conn, ok := getConn()
+		if !ok {
+			b.logf("localbackend: getConn didn't complete from %v to port %v", srcAddr, dport)
+			return
+		}
 		hs := &http.Server{
+			TLSConfig: &tls.Config{
+				GetCertificate: b.getTLSServeCertForPort(dport),
+			},
 			Handler: http.HandlerFunc(b.serveWebHandler),
 			BaseContext: func(_ net.Listener) context.Context {
 				return context.WithValue(context.Background(), serveHTTPContextKey{}, &serveHTTPContext{
@@ -342,92 +339,79 @@ func (b *LocalBackend) tcpHandlerForServe(dport uint16, srcAddr netip.AddrPort)
 				})
 			},
 		}
-		if tcph.HTTPS() {
-			hs.TLSConfig = &tls.Config{
-				GetCertificate: b.getTLSServeCertForPort(dport),
-			}
-			return func(c net.Conn) error {
-				return hs.ServeTLS(netutil.NewOneConnListener(c, nil), "", "")
-			}
-		}
-
-		return func(c net.Conn) error {
-			return hs.Serve(netutil.NewOneConnListener(c, nil))
-		}
+		hs.ServeTLS(netutil.NewOneConnListener(conn, nil), "", "")
+		return
 	}
 
 	if backDst := tcph.TCPForward(); backDst != "" {
-		return func(conn net.Conn) error {
-			defer conn.Close()
-			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-			backConn, err := b.dialer.SystemDial(ctx, "tcp", backDst)
-			cancel()
-			if err != nil {
-				b.logf("localbackend: failed to TCP proxy port %v (from %v) to %s: %v", dport, srcAddr, backDst, err)
-				return nil
-			}
-			defer backConn.Close()
-			if sni := tcph.TerminateTLS(); sni != "" {
-				conn = tls.Server(conn, &tls.Config{
-					GetCertificate: func(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
-						ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
-						defer cancel()
-						pair, err := b.GetCertPEM(ctx, sni)
-						if err != nil {
-							return nil, err
-						}
-						cert, err := tls.X509KeyPair(pair.CertPEM, pair.KeyPEM)
-						if err != nil {
-							return nil, err
-						}
-						return &cert, nil
-					},
-				})
-			}
-
-			// TODO(bradfitz): do the RegisterIPPortIdentity and
-			// UnregisterIPPortIdentity stuff that netstack does
-			errc := make(chan error, 1)
-			go func() {
-				_, err := io.Copy(backConn, conn)
-				errc <- err
-			}()
-			go func() {
-				_, err := io.Copy(conn, backConn)
-				errc <- err
-			}()
-			return <-errc
+		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		backConn, err := b.dialer.SystemDial(ctx, "tcp", backDst)
+		cancel()
+		if err != nil {
+			b.logf("localbackend: failed to TCP proxy port %v (from %v) to %s: %v", dport, srcAddr, backDst, err)
+			sendRST()
+			return
 		}
+		conn, ok := getConn()
+		if !ok {
+			b.logf("localbackend: getConn didn't complete from %v to port %v", srcAddr, dport)
+			backConn.Close()
+			return
+		}
+		defer conn.Close()
+		defer backConn.Close()
+
+		if sni := tcph.TerminateTLS(); sni != "" {
+			conn = tls.Server(conn, &tls.Config{
+				GetCertificate: func(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
+					ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+					defer cancel()
+					pair, err := b.GetCertPEM(ctx, sni)
+					if err != nil {
+						return nil, err
+					}
+					cert, err := tls.X509KeyPair(pair.CertPEM, pair.KeyPEM)
+					if err != nil {
+						return nil, err
+					}
+					return &cert, nil
+				},
+			})
+		}
+
+		// TODO(bradfitz): do the RegisterIPPortIdentity and
+		// UnregisterIPPortIdentity stuff that netstack does
+
+		errc := make(chan error, 1)
+		go func() {
+			_, err := io.Copy(backConn, conn)
+			errc <- err
+		}()
+		go func() {
+			_, err := io.Copy(conn, backConn)
+			errc <- err
+		}()
+		<-errc
+		return
 	}
 
 	b.logf("closing TCP conn to port %v (from %v) with actionless TCPPortHandler", dport, srcAddr)
-	return nil
-}
-
-func getServeHTTPContext(r *http.Request) (c *serveHTTPContext, ok bool) {
-	c, ok = r.Context().Value(serveHTTPContextKey{}).(*serveHTTPContext)
-	return c, ok
+	sendRST()
 }
 
 func (b *LocalBackend) getServeHandler(r *http.Request) (_ ipn.HTTPHandlerView, at string, ok bool) {
 	var z ipn.HTTPHandlerView // zero value
 
-	hostname := r.Host
 	if r.TLS == nil {
-		tcd := "." + b.Status().CurrentTailnet.MagicDNSSuffix
-		if !strings.HasSuffix(hostname, tcd) {
-			hostname += tcd
-		}
-	} else {
-		hostname = r.TLS.ServerName
+		return z, "", false
 	}
 
-	sctx, ok := getServeHTTPContext(r)
+	sctx, ok := r.Context().Value(serveHTTPContextKey{}).(*serveHTTPContext)
 	if !ok {
 		b.logf("[unexpected] localbackend: no serveHTTPContext in request")
 		return z, "", false
 	}
-	wsc, ok := b.webServerConfig(hostname, sctx.DestPort)
+	wsc, ok := b.webServerConfig(r.TLS.ServerName, sctx.DestPort)
 	if !ok {
 		return z, "", false
 	}
@@ -463,8 +447,11 @@ func (b *LocalBackend) proxyHandlerForBackend(backend string) (*httputil.Reverse
 		Rewrite: func(r *httputil.ProxyRequest) {
 			r.SetURL(u)
 			r.Out.Host = r.In.Host
-			addProxyForwardedHeaders(r)
-			b.addTailscaleIdentityHeaders(r)
+			r.Out.Header.Set("X-Forwarded-Host", r.In.Host)
+			r.Out.Header.Set("X-Forwarded-Proto", "https")
+			if c, ok := r.Out.Context().Value(serveHTTPContextKey{}).(*serveHTTPContext); ok {
+				r.Out.Header.Set("X-Forwarded-For", c.SrcAddr.Addr().String())
+			}
 		},
 		Transport: &http.Transport{
 			DialContext: b.dialer.SystemDial,
@@ -482,40 +469,6 @@ func (b *LocalBackend) proxyHandlerForBackend(backend string) (*httputil.Reverse
 	return rp, nil
 }
 
-func addProxyForwardedHeaders(r *httputil.ProxyRequest) {
-	r.Out.Header.Set("X-Forwarded-Host", r.In.Host)
-	if r.In.TLS != nil {
-		r.Out.Header.Set("X-Forwarded-Proto", "https")
-	}
-	if c, ok := getServeHTTPContext(r.Out); ok {
-		r.Out.Header.Set("X-Forwarded-For", c.SrcAddr.Addr().String())
-	}
-}
-
-func (b *LocalBackend) addTailscaleIdentityHeaders(r *httputil.ProxyRequest) {
-	// Clear any incoming values squatting in the headers.
-	r.Out.Header.Del("Tailscale-User-Login")
-	r.Out.Header.Del("Tailscale-User-Name")
-	r.Out.Header.Del("Tailscale-Headers-Info")
-
-	c, ok := getServeHTTPContext(r.Out)
-	if !ok {
-		return
-	}
-	node, user, ok := b.WhoIs(c.SrcAddr)
-	if !ok {
-		return // traffic from outside of Tailnet (funneled)
-	}
-	if node.IsTagged() {
-		// 2023-06-14: Not setting identity headers for tagged nodes.
-		// Only currently set for nodes with user identities.
-		return
-	}
-	r.Out.Header.Set("Tailscale-User-Login", user.LoginName)
-	r.Out.Header.Set("Tailscale-User-Name", user.DisplayName)
-	r.Out.Header.Set("Tailscale-Headers-Info", "https://tailscale.com/s/serve-headers")
-}
-
 func (b *LocalBackend) serveWebHandler(w http.ResponseWriter, r *http.Request) {
 	h, mountPoint, ok := b.getServeHandler(r)
 	if !ok {
@@ -648,8 +601,8 @@ func allNumeric(s string) bool {
 	return s != ""
 }
 
-func (b *LocalBackend) webServerConfig(hostname string, port uint16) (c ipn.WebServerConfigView, ok bool) {
-	key := ipn.HostPort(fmt.Sprintf("%s:%v", hostname, port))
+func (b *LocalBackend) webServerConfig(sniName string, port uint16) (c ipn.WebServerConfigView, ok bool) {
+	key := ipn.HostPort(fmt.Sprintf("%s:%v", sniName, port))
 
 	b.mu.Lock()
 	defer b.mu.Unlock()

ipn/ipnlocal/serve_test.go

@@ -10,22 +10,13 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
-	"net/netip"
 	"net/url"
 	"os"
 	"path/filepath"
-	"strings"
 	"testing"
 
 	"tailscale.com/ipn"
-	"tailscale.com/ipn/store/mem"
-	"tailscale.com/tailcfg"
-	"tailscale.com/tsd"
-	"tailscale.com/types/logid"
-	"tailscale.com/types/netmap"
 	"tailscale.com/util/cmpx"
-	"tailscale.com/util/must"
-	"tailscale.com/wgengine"
 )
 
 func TestExpandProxyArg(t *testing.T) {
@@ -169,142 +160,6 @@ func TestGetServeHandler(t *testing.T) {
 	}
 }
 
-func TestServeHTTPProxy(t *testing.T) {
-	sys := &tsd.System{}
-	e, err := wgengine.NewUserspaceEngine(t.Logf, wgengine.Config{SetSubsystem: sys.Set})
-	if err != nil {
-		t.Fatal(err)
-	}
-	sys.Set(e)
-	sys.Set(new(mem.Store))
-	b, err := NewLocalBackend(t.Logf, logid.PublicID{}, sys, 0)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer b.Shutdown()
-	dir := t.TempDir()
-	b.SetVarRoot(dir)
-
-	pm := must.Get(newProfileManager(new(mem.Store), t.Logf))
-	pm.currentProfile = &ipn.LoginProfile{ID: "id0"}
-	b.pm = pm
-
-	b.netMap = &netmap.NetworkMap{
-		SelfNode: &tailcfg.Node{
-			Name: "example.ts.net",
-		},
-		UserProfiles: map[tailcfg.UserID]tailcfg.UserProfile{
-			tailcfg.UserID(1): {
-				LoginName:   "someone@example.com",
-				DisplayName: "Some One",
-			},
-		},
-	}
-	b.nodeByAddr = map[netip.Addr]*tailcfg.Node{
-		netip.MustParseAddr("100.150.151.152"): {
-			ComputedName: "some-peer",
-			User:         tailcfg.UserID(1),
-		},
-		netip.MustParseAddr("100.150.151.153"): {
-			ComputedName: "some-tagged-peer",
-			Tags:         []string{"tag:server", "tag:test"},
-			User:         tailcfg.UserID(1),
-		},
-	}
-
-	// Start test serve endpoint.
-	testServ := httptest.NewServer(http.HandlerFunc(
-		func(w http.ResponseWriter, r *http.Request) {
-			// Piping all the headers through the response writer
-			// so we can check their values in tests below.
-			for key, val := range r.Header {
-				w.Header().Add(key, strings.Join(val, ","))
-			}
-		},
-	))
-	defer testServ.Close()
-
-	conf := &ipn.ServeConfig{
-		Web: map[ipn.HostPort]*ipn.WebServerConfig{
-			"example.ts.net:443": {Handlers: map[string]*ipn.HTTPHandler{
-				"/": {Proxy: testServ.URL},
-			}},
-		},
-	}
-	if err := b.SetServeConfig(conf); err != nil {
-		t.Fatal(err)
-	}
-
-	type headerCheck struct {
-		header string
-		want   string
-	}
-
-	tests := []struct {
-		name        string
-		srcIP       string
-		wantHeaders []headerCheck
-	}{
-		{
-			name:  "request-from-user-within-tailnet",
-			srcIP: "100.150.151.152",
-			wantHeaders: []headerCheck{
-				{"X-Forwarded-Proto", "https"},
-				{"X-Forwarded-For", "100.150.151.152"},
-				{"Tailscale-User-Login", "someone@example.com"},
-				{"Tailscale-User-Name", "Some One"},
-				{"Tailscale-Headers-Info", "https://tailscale.com/s/serve-headers"},
-			},
-		},
-		{
-			name:  "request-from-tagged-node-within-tailnet",
-			srcIP: "100.150.151.153",
-			wantHeaders: []headerCheck{
-				{"X-Forwarded-Proto", "https"},
-				{"X-Forwarded-For", "100.150.151.153"},
-				{"Tailscale-User-Login", ""},
-				{"Tailscale-User-Name", ""},
-				{"Tailscale-Headers-Info", ""},
-			},
-		},
-		{
-			name:  "request-from-outside-tailnet",
-			srcIP: "100.160.161.162",
-			wantHeaders: []headerCheck{
-				{"X-Forwarded-Proto", "https"},
-				{"X-Forwarded-For", "100.160.161.162"},
-				{"Tailscale-User-Login", ""},
-				{"Tailscale-User-Name", ""},
-				{"Tailscale-Headers-Info", ""},
-			},
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			req := &http.Request{
-				URL: &url.URL{Path: "/"},
-				TLS: &tls.ConnectionState{ServerName: "example.ts.net"},
-			}
-			req = req.WithContext(context.WithValue(req.Context(), serveHTTPContextKey{}, &serveHTTPContext{
-				DestPort: 443,
-				SrcAddr:  netip.MustParseAddrPort(tt.srcIP + ":1234"), // random src port for tests
-			}))
-
-			w := httptest.NewRecorder()
-			b.serveWebHandler(w, req)
-
-			// Verify the headers.
-			h := w.Result().Header
-			for _, c := range tt.wantHeaders {
-				if got := h.Get(c.header); got != c.want {
-					t.Errorf("invalid %q header; want=%q, got=%q", c.header, c.want, got)
-				}
-			}
-		})
-	}
-}
-
 func TestServeFileOrDirectory(t *testing.T) {
 	td := t.TempDir()
 	writeFile := func(suffix, contents string) {

ipn/ipnstate/ipnstate.go

@@ -223,8 +223,9 @@ type PeerStatus struct {
 	LastSeen       time.Time // last seen to tailcontrol; only present if offline
 	LastHandshake  time.Time // with local wireguard
 	Online         bool      // whether node is connected to the control plane
-	ExitNode       bool      // true if this is the currently selected exit node.
-	ExitNodeOption bool      // true if this node can be an exit node (offered && approved)
+	KeepAlive      bool
+	ExitNode       bool // true if this is the currently selected exit node.
+	ExitNodeOption bool // true if this node can be an exit node (offered && approved)
 
 	// Active is whether the node was recently active. The
 	// definition is somewhat undefined but has historically and
@@ -436,6 +437,9 @@ func (sb *StatusBuilder) AddPeer(peer key.NodePublic, st *PeerStatus) {
 	if st.InEngine {
 		e.InEngine = true
 	}
+	if st.KeepAlive {
+		e.KeepAlive = true
+	}
 	if st.ExitNode {
 		e.ExitNode = true
 	}

ipn/localapi/localapi.go

@@ -104,7 +104,6 @@ var handler = map[string]localAPIHandler{
 	"tka/force-local-disable":     (*Handler).serveTKALocalDisable,
 	"tka/affected-sigs":           (*Handler).serveTKAAffectedSigs,
 	"tka/wrap-preauth-key":        (*Handler).serveTKAWrapPreauthKey,
-	"tka/verify-deeplink":         (*Handler).serveTKAVerifySigningDeeplink,
 	"upload-client-metrics":       (*Handler).serveUploadClientMetrics,
 	"watch-ipn-bus":               (*Handler).serveWatchIPNBus,
 	"whois":                       (*Handler).serveWhoIs,
@@ -1331,7 +1330,7 @@ func (h *Handler) servePing(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	pingTypeStr := r.FormValue("type")
-	if pingTypeStr == "" {
+	if ipStr == "" {
 		http.Error(w, "missing 'type' parameter", 400)
 		return
 	}
@@ -1611,35 +1610,6 @@ func (h *Handler) serveTKAWrapPreauthKey(w http.ResponseWriter, r *http.Request)
 	w.Write([]byte(wrappedKey))
 }
 
-func (h *Handler) serveTKAVerifySigningDeeplink(w http.ResponseWriter, r *http.Request) {
-	if !h.PermitRead {
-		http.Error(w, "signing deeplink verification access denied", http.StatusForbidden)
-		return
-	}
-	if r.Method != httpm.POST {
-		http.Error(w, "use POST", http.StatusMethodNotAllowed)
-		return
-	}
-
-	type verifyRequest struct {
-		URL string
-	}
-	var req verifyRequest
-	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-		http.Error(w, "invalid JSON for verifyRequest body", 400)
-		return
-	}
-
-	res := h.b.NetworkLockVerifySigningDeeplink(req.URL)
-	j, err := json.MarshalIndent(res, "", "\t")
-	if err != nil {
-		http.Error(w, "JSON encoding error", 500)
-		return
-	}
-	w.Header().Set("Content-Type", "application/json")
-	w.Write(j)
-}
-
 func (h *Handler) serveTKADisable(w http.ResponseWriter, r *http.Request) {
 	if !h.PermitWrite {
 		http.Error(w, "network-lock modify access denied", http.StatusForbidden)

ipn/serve.go

@@ -76,12 +76,6 @@ type TCPPortHandler struct {
 	// It is mutually exclusive with TCPForward.
 	HTTPS bool `json:",omitempty"`
 
-	// HTTP, if true, means that tailscaled should handle this connection as an
-	// HTTP request as configured by ServeConfig.Web.
-	//
-	// It is mutually exclusive with TCPForward.
-	HTTP bool `json:",omitempty"`
-
 	// TCPForward is the IP:port to forward TCP connections to.
 	// Whether or not TLS is terminated by tailscaled depends on
 	// TerminateTLS.
@@ -109,7 +103,7 @@ type HTTPHandler struct {
 	// temporary ones? Error codes? Redirects?
 }
 
-// WebHandlerExists reports whether if the ServeConfig Web handler exists for
+// WebHandlerExists checks if the ServeConfig Web handler exists for
 // the given host:port and mount point.
 func (sc *ServeConfig) WebHandlerExists(hp HostPort, mount string) bool {
 	h := sc.GetWebHandler(hp, mount)
@@ -134,8 +128,9 @@ func (sc *ServeConfig) GetTCPPortHandler(port uint16) *TCPPortHandler {
 	return sc.TCP[port]
 }
 
-// IsTCPForwardingAny reports whether ServeConfig is currently forwarding in
-// TCPForward mode on any port. This is exclusive of Web/HTTPS serving.
+// IsTCPForwardingAny checks if ServeConfig is currently forwarding
+// in TCPForward mode on any port.
+// This is exclusive of Web/HTTPS serving.
 func (sc *ServeConfig) IsTCPForwardingAny() bool {
 	if sc == nil || len(sc.TCP) == 0 {
 		return false
@@ -148,47 +143,34 @@ func (sc *ServeConfig) IsTCPForwardingAny() bool {
 	return false
 }
 
-// IsTCPForwardingOnPort reports whether if ServeConfig is currently forwarding
-// in TCPForward mode on the given port. This is exclusive of Web/HTTPS serving.
+// IsTCPForwardingOnPort checks if ServeConfig is currently forwarding
+// in TCPForward mode on the given port.
+// This is exclusive of Web/HTTPS serving.
 func (sc *ServeConfig) IsTCPForwardingOnPort(port uint16) bool {
 	if sc == nil || sc.TCP[port] == nil {
 		return false
 	}
-	return !sc.IsServingWeb(port)
+	return !sc.TCP[port].HTTPS
 }
 
-// IsServingWeb reports whether if ServeConfig is currently serving Web
-// (HTTP/HTTPS) on the given port. This is exclusive of TCPForwarding.
+// IsServingWeb checks if ServeConfig is currently serving
+// Web/HTTPS on the given port.
+// This is exclusive of TCPForwarding.
 func (sc *ServeConfig) IsServingWeb(port uint16) bool {
-	return sc.IsServingHTTP(port) || sc.IsServingHTTPS(port)
-}
-
-// IsServingHTTPS reports whether if ServeConfig is currently serving HTTPS on
-// the given port. This is exclusive of HTTP and TCPForwarding.
-func (sc *ServeConfig) IsServingHTTPS(port uint16) bool {
 	if sc == nil || sc.TCP[port] == nil {
 		return false
 	}
 	return sc.TCP[port].HTTPS
 }
 
-// IsServingHTTP reports whether if ServeConfig is currently serving HTTP on the
-// given port. This is exclusive of HTTPS and TCPForwarding.
-func (sc *ServeConfig) IsServingHTTP(port uint16) bool {
-	if sc == nil || sc.TCP[port] == nil {
-		return false
-	}
-	return sc.TCP[port].HTTP
-}
-
-// IsFunnelOn reports whether if ServeConfig is currently allowing funnel
-// traffic for any host:port.
+// IsFunnelOn checks if ServeConfig is currently allowing
+// funnel traffic for any host:port.
 //
 // View version of ServeConfig.IsFunnelOn.
 func (v ServeConfigView) IsFunnelOn() bool { return v.ж.IsFunnelOn() }
 
-// IsFunnelOn reports whether if ServeConfig is currently allowing funnel
-// traffic for any host:port.
+// IsFunnelOn checks if ServeConfig is currently allowing
+// funnel traffic for any host:port.
 func (sc *ServeConfig) IsFunnelOn() bool {
 	if sc == nil {
 		return false

licenses/android.md

@@ -69,14 +69,14 @@ Client][].  See also the dependencies in the [Tailscale CLI][].
  - [go4.org/mem](https://pkg.go.dev/go4.org/mem) ([Apache-2.0](https://github.com/go4org/mem/blob/4f986261bf13/LICENSE))
  - [go4.org/netipx](https://pkg.go.dev/go4.org/netipx) ([BSD-3-Clause](https://github.com/go4org/netipx/blob/f1b76eb4bb35/LICENSE))
  - [go4.org/unsafe/assume-no-moving-gc](https://pkg.go.dev/go4.org/unsafe/assume-no-moving-gc) ([BSD-3-Clause](https://github.com/go4org/unsafe-assume-no-moving-gc/blob/ee73d164e760/LICENSE))
- - [golang.org/x/crypto](https://pkg.go.dev/golang.org/x/crypto) ([BSD-3-Clause](https://cs.opensource.google/go/x/crypto/+/v0.9.0:LICENSE))
+ - [golang.org/x/crypto](https://pkg.go.dev/golang.org/x/crypto) ([BSD-3-Clause](https://cs.opensource.google/go/x/crypto/+/v0.8.0:LICENSE))
  - [golang.org/x/exp](https://pkg.go.dev/golang.org/x/exp) ([BSD-3-Clause](https://cs.opensource.google/go/x/exp/+/47ecfdc1:LICENSE))
  - [golang.org/x/exp/shiny](https://pkg.go.dev/golang.org/x/exp/shiny) ([BSD-3-Clause](https://cs.opensource.google/go/x/exp/+/334a2380:shiny/LICENSE))
  - [golang.org/x/image](https://pkg.go.dev/golang.org/x/image) ([BSD-3-Clause](https://cs.opensource.google/go/x/image/+/v0.7.0:LICENSE))
- - [golang.org/x/net](https://pkg.go.dev/golang.org/x/net) ([BSD-3-Clause](https://cs.opensource.google/go/x/net/+/v0.10.0:LICENSE))
+ - [golang.org/x/net](https://pkg.go.dev/golang.org/x/net) ([BSD-3-Clause](https://cs.opensource.google/go/x/net/+/v0.9.0:LICENSE))
  - [golang.org/x/sync/errgroup](https://pkg.go.dev/golang.org/x/sync/errgroup) ([BSD-3-Clause](https://cs.opensource.google/go/x/sync/+/v0.2.0:LICENSE))
- - [golang.org/x/sys](https://pkg.go.dev/golang.org/x/sys) ([BSD-3-Clause](https://cs.opensource.google/go/x/sys/+/5059a07a:LICENSE))
- - [golang.org/x/term](https://pkg.go.dev/golang.org/x/term) ([BSD-3-Clause](https://cs.opensource.google/go/x/term/+/v0.8.0:LICENSE))
+ - [golang.org/x/sys](https://pkg.go.dev/golang.org/x/sys) ([BSD-3-Clause](https://cs.opensource.google/go/x/sys/+/v0.8.0:LICENSE))
+ - [golang.org/x/term](https://pkg.go.dev/golang.org/x/term) ([BSD-3-Clause](https://cs.opensource.google/go/x/term/+/v0.7.0:LICENSE))
  - [golang.org/x/text](https://pkg.go.dev/golang.org/x/text) ([BSD-3-Clause](https://cs.opensource.google/go/x/text/+/v0.9.0:LICENSE))
  - [golang.org/x/time/rate](https://pkg.go.dev/golang.org/x/time/rate) ([BSD-3-Clause](https://cs.opensource.google/go/x/time/+/v0.3.0:LICENSE))
  - [gvisor.dev/gvisor/pkg](https://pkg.go.dev/gvisor.dev/gvisor/pkg) ([Apache-2.0](https://github.com/google/gvisor/blob/7b0a1988a28f/LICENSE))

licenses/apple.md

@@ -31,7 +31,6 @@ and [iOS][].  See also the dependencies in the [Tailscale CLI][].
  - [github.com/godbus/dbus/v5](https://pkg.go.dev/github.com/godbus/dbus/v5) ([BSD-2-Clause](https://github.com/godbus/dbus/blob/v5.1.0/LICENSE))
  - [github.com/golang/groupcache/lru](https://pkg.go.dev/github.com/golang/groupcache/lru) ([Apache-2.0](https://github.com/golang/groupcache/blob/41bb18bfe9da/LICENSE))
  - [github.com/google/btree](https://pkg.go.dev/github.com/google/btree) ([Apache-2.0](https://github.com/google/btree/blob/v1.1.2/LICENSE))
- - [github.com/google/nftables](https://pkg.go.dev/github.com/google/nftables) ([Apache-2.0](https://github.com/google/nftables/blob/9aa6fdf5a28c/LICENSE))
  - [github.com/hdevalence/ed25519consensus](https://pkg.go.dev/github.com/hdevalence/ed25519consensus) ([BSD-3-Clause](https://github.com/hdevalence/ed25519consensus/blob/v0.1.0/LICENSE))
  - [github.com/illarion/gonotify](https://pkg.go.dev/github.com/illarion/gonotify) ([MIT](https://github.com/illarion/gonotify/blob/v1.0.1/LICENSE))
  - [github.com/insomniacslk/dhcp](https://pkg.go.dev/github.com/insomniacslk/dhcp) ([BSD-3-Clause](https://github.com/insomniacslk/dhcp/blob/974c6f05fe16/LICENSE))
@@ -59,13 +58,13 @@ and [iOS][].  See also the dependencies in the [Tailscale CLI][].
  - [github.com/x448/float16](https://pkg.go.dev/github.com/x448/float16) ([MIT](https://github.com/x448/float16/blob/v0.8.4/LICENSE))
  - [go4.org/mem](https://pkg.go.dev/go4.org/mem) ([Apache-2.0](https://github.com/go4org/mem/blob/4f986261bf13/LICENSE))
  - [go4.org/netipx](https://pkg.go.dev/go4.org/netipx) ([BSD-3-Clause](https://github.com/go4org/netipx/blob/f1b76eb4bb35/LICENSE))
- - [golang.org/x/crypto](https://pkg.go.dev/golang.org/x/crypto) ([BSD-3-Clause](https://cs.opensource.google/go/x/crypto/+/v0.10.0:LICENSE))
+ - [golang.org/x/crypto](https://pkg.go.dev/golang.org/x/crypto) ([BSD-3-Clause](https://cs.opensource.google/go/x/crypto/+/v0.8.0:LICENSE))
  - [golang.org/x/exp](https://pkg.go.dev/golang.org/x/exp) ([BSD-3-Clause](https://cs.opensource.google/go/x/exp/+/47ecfdc1:LICENSE))
- - [golang.org/x/net](https://pkg.go.dev/golang.org/x/net) ([BSD-3-Clause](https://github.com/tailscale/golang-x-net/blob/9a58c47922fd/LICENSE))
+ - [golang.org/x/net](https://pkg.go.dev/golang.org/x/net) ([BSD-3-Clause](https://cs.opensource.google/go/x/net/+/v0.10.0:LICENSE))
  - [golang.org/x/sync/errgroup](https://pkg.go.dev/golang.org/x/sync/errgroup) ([BSD-3-Clause](https://cs.opensource.google/go/x/sync/+/v0.2.0:LICENSE))
- - [golang.org/x/sys](https://pkg.go.dev/golang.org/x/sys) ([BSD-3-Clause](https://cs.opensource.google/go/x/sys/+/v0.9.0:LICENSE))
- - [golang.org/x/term](https://pkg.go.dev/golang.org/x/term) ([BSD-3-Clause](https://cs.opensource.google/go/x/term/+/v0.9.0:LICENSE))
- - [golang.org/x/text](https://pkg.go.dev/golang.org/x/text) ([BSD-3-Clause](https://cs.opensource.google/go/x/text/+/v0.10.0:LICENSE))
+ - [golang.org/x/sys](https://pkg.go.dev/golang.org/x/sys) ([BSD-3-Clause](https://cs.opensource.google/go/x/sys/+/v0.8.0:LICENSE))
+ - [golang.org/x/term](https://pkg.go.dev/golang.org/x/term) ([BSD-3-Clause](https://cs.opensource.google/go/x/term/+/v0.8.0:LICENSE))
+ - [golang.org/x/text](https://pkg.go.dev/golang.org/x/text) ([BSD-3-Clause](https://cs.opensource.google/go/x/text/+/v0.9.0:LICENSE))
  - [golang.org/x/time/rate](https://pkg.go.dev/golang.org/x/time/rate) ([BSD-3-Clause](https://cs.opensource.google/go/x/time/+/v0.3.0:LICENSE))
  - [gvisor.dev/gvisor/pkg](https://pkg.go.dev/gvisor.dev/gvisor/pkg) ([Apache-2.0](https://github.com/google/gvisor/blob/7b0a1988a28f/LICENSE))
  - [inet.af/peercred](https://pkg.go.dev/inet.af/peercred) ([BSD-3-Clause](https://github.com/inetaf/peercred/blob/0893ea02156a/LICENSE))

licenses/tailscale.md

@@ -84,7 +84,7 @@ Some packages may only be included on certain architectures or operating systems
  - [golang.org/x/net](https://pkg.go.dev/golang.org/x/net) ([BSD-3-Clause](https://cs.opensource.google/go/x/net/+/v0.10.0:LICENSE))
  - [golang.org/x/oauth2](https://pkg.go.dev/golang.org/x/oauth2) ([BSD-3-Clause](https://cs.opensource.google/go/x/oauth2/+/v0.7.0:LICENSE))
  - [golang.org/x/sync/errgroup](https://pkg.go.dev/golang.org/x/sync/errgroup) ([BSD-3-Clause](https://cs.opensource.google/go/x/sync/+/v0.2.0:LICENSE))
- - [golang.org/x/sys](https://pkg.go.dev/golang.org/x/sys) ([BSD-3-Clause](https://cs.opensource.google/go/x/sys/+/5059a07a:LICENSE))
+ - [golang.org/x/sys](https://pkg.go.dev/golang.org/x/sys) ([BSD-3-Clause](https://cs.opensource.google/go/x/sys/+/v0.8.0:LICENSE))
  - [golang.org/x/term](https://pkg.go.dev/golang.org/x/term) ([BSD-3-Clause](https://cs.opensource.google/go/x/term/+/v0.8.0:LICENSE))
  - [golang.org/x/text](https://pkg.go.dev/golang.org/x/text) ([BSD-3-Clause](https://cs.opensource.google/go/x/text/+/v0.9.0:LICENSE))
  - [golang.org/x/time/rate](https://pkg.go.dev/golang.org/x/time/rate) ([BSD-3-Clause](https://cs.opensource.google/go/x/time/+/v0.3.0:LICENSE))

licenses/windows.md

@@ -14,12 +14,10 @@ Windows][].  See also the dependencies in the [Tailscale CLI][].
  - [github.com/alexbrainman/sspi](https://pkg.go.dev/github.com/alexbrainman/sspi) ([BSD-3-Clause](https://github.com/alexbrainman/sspi/blob/909beea2cc74/LICENSE))
  - [github.com/apenwarr/fixconsole](https://pkg.go.dev/github.com/apenwarr/fixconsole) ([Apache-2.0](https://github.com/apenwarr/fixconsole/blob/5a9f6489cc29/LICENSE))
  - [github.com/apenwarr/w32](https://pkg.go.dev/github.com/apenwarr/w32) ([BSD-3-Clause](https://github.com/apenwarr/w32/blob/aa00fece76ab/LICENSE))
- - [github.com/coreos/go-iptables/iptables](https://pkg.go.dev/github.com/coreos/go-iptables/iptables) ([Apache-2.0](https://github.com/coreos/go-iptables/blob/v0.6.0/LICENSE))
  - [github.com/dblohm7/wingoes](https://pkg.go.dev/github.com/dblohm7/wingoes) ([BSD-3-Clause](https://github.com/dblohm7/wingoes/blob/111c8c3b57c8/LICENSE))
  - [github.com/fxamacker/cbor/v2](https://pkg.go.dev/github.com/fxamacker/cbor/v2) ([MIT](https://github.com/fxamacker/cbor/blob/v2.4.0/LICENSE))
  - [github.com/golang/groupcache/lru](https://pkg.go.dev/github.com/golang/groupcache/lru) ([Apache-2.0](https://github.com/golang/groupcache/blob/41bb18bfe9da/LICENSE))
  - [github.com/google/btree](https://pkg.go.dev/github.com/google/btree) ([Apache-2.0](https://github.com/google/btree/blob/v1.1.2/LICENSE))
- - [github.com/google/nftables](https://pkg.go.dev/github.com/google/nftables) ([Apache-2.0](https://github.com/google/nftables/blob/9aa6fdf5a28c/LICENSE))
  - [github.com/google/uuid](https://pkg.go.dev/github.com/google/uuid) ([BSD-3-Clause](https://github.com/google/uuid/blob/v1.3.0/LICENSE))
  - [github.com/gregjones/httpcache](https://pkg.go.dev/github.com/gregjones/httpcache) ([MIT](https://github.com/gregjones/httpcache/blob/901d90724c79/LICENSE.txt))
  - [github.com/hdevalence/ed25519consensus](https://pkg.go.dev/github.com/hdevalence/ed25519consensus) ([BSD-3-Clause](https://github.com/hdevalence/ed25519consensus/blob/v0.1.0/LICENSE))
@@ -34,29 +32,24 @@ Windows][].  See also the dependencies in the [Tailscale CLI][].
  - [github.com/nfnt/resize](https://pkg.go.dev/github.com/nfnt/resize) ([ISC](https://github.com/nfnt/resize/blob/83c6a9932646/LICENSE))
  - [github.com/peterbourgon/diskv](https://pkg.go.dev/github.com/peterbourgon/diskv) ([MIT](https://github.com/peterbourgon/diskv/blob/v2.0.1/LICENSE))
  - [github.com/skip2/go-qrcode](https://pkg.go.dev/github.com/skip2/go-qrcode) ([MIT](https://github.com/skip2/go-qrcode/blob/da1b6568686e/LICENSE))
- - [github.com/tailscale/netlink](https://pkg.go.dev/github.com/tailscale/netlink) ([Apache-2.0](https://github.com/tailscale/netlink/blob/cabfb018fe85/LICENSE))
  - [github.com/tailscale/walk](https://pkg.go.dev/github.com/tailscale/walk) ([BSD-3-Clause](https://github.com/tailscale/walk/blob/f63dace725d8/LICENSE))
  - [github.com/tailscale/win](https://pkg.go.dev/github.com/tailscale/win) ([BSD-3-Clause](https://github.com/tailscale/win/blob/59dfb47dfef1/LICENSE))
  - [github.com/tc-hib/winres](https://pkg.go.dev/github.com/tc-hib/winres) ([0BSD](https://github.com/tc-hib/winres/blob/v0.2.0/LICENSE))
- - [github.com/vishvananda/netlink/nl](https://pkg.go.dev/github.com/vishvananda/netlink/nl) ([Apache-2.0](https://github.com/vishvananda/netlink/blob/v1.2.1-beta.2/LICENSE))
- - [github.com/vishvananda/netns](https://pkg.go.dev/github.com/vishvananda/netns) ([Apache-2.0](https://github.com/vishvananda/netns/blob/v0.0.4/LICENSE))
  - [github.com/x448/float16](https://pkg.go.dev/github.com/x448/float16) ([MIT](https://github.com/x448/float16/blob/v0.8.4/LICENSE))
  - [go4.org/mem](https://pkg.go.dev/go4.org/mem) ([Apache-2.0](https://github.com/go4org/mem/blob/4f986261bf13/LICENSE))
  - [go4.org/netipx](https://pkg.go.dev/go4.org/netipx) ([BSD-3-Clause](https://github.com/go4org/netipx/blob/f1b76eb4bb35/LICENSE))
- - [golang.org/x/crypto](https://pkg.go.dev/golang.org/x/crypto) ([BSD-3-Clause](https://cs.opensource.google/go/x/crypto/+/v0.10.0:LICENSE))
+ - [golang.org/x/crypto](https://pkg.go.dev/golang.org/x/crypto) ([BSD-3-Clause](https://cs.opensource.google/go/x/crypto/+/v0.8.0:LICENSE))
  - [golang.org/x/exp](https://pkg.go.dev/golang.org/x/exp) ([BSD-3-Clause](https://cs.opensource.google/go/x/exp/+/47ecfdc1:LICENSE))
  - [golang.org/x/image/bmp](https://pkg.go.dev/golang.org/x/image/bmp) ([BSD-3-Clause](https://cs.opensource.google/go/x/image/+/v0.7.0:LICENSE))
  - [golang.org/x/mod](https://pkg.go.dev/golang.org/x/mod) ([BSD-3-Clause](https://cs.opensource.google/go/x/mod/+/v0.10.0:LICENSE))
- - [golang.org/x/net](https://pkg.go.dev/golang.org/x/net) ([BSD-3-Clause](https://github.com/tailscale/golang-x-net/blob/9a58c47922fd/LICENSE))
+ - [golang.org/x/net](https://pkg.go.dev/golang.org/x/net) ([BSD-3-Clause](https://cs.opensource.google/go/x/net/+/v0.10.0:LICENSE))
  - [golang.org/x/sync/errgroup](https://pkg.go.dev/golang.org/x/sync/errgroup) ([BSD-3-Clause](https://cs.opensource.google/go/x/sync/+/v0.2.0:LICENSE))
- - [golang.org/x/sys](https://pkg.go.dev/golang.org/x/sys) ([BSD-3-Clause](https://cs.opensource.google/go/x/sys/+/v0.9.0:LICENSE))
- - [golang.org/x/term](https://pkg.go.dev/golang.org/x/term) ([BSD-3-Clause](https://cs.opensource.google/go/x/term/+/v0.9.0:LICENSE))
- - [golang.org/x/text](https://pkg.go.dev/golang.org/x/text) ([BSD-3-Clause](https://cs.opensource.google/go/x/text/+/v0.10.0:LICENSE))
- - [golang.org/x/time/rate](https://pkg.go.dev/golang.org/x/time/rate) ([BSD-3-Clause](https://cs.opensource.google/go/x/time/+/v0.3.0:LICENSE))
+ - [golang.org/x/sys](https://pkg.go.dev/golang.org/x/sys) ([BSD-3-Clause](https://cs.opensource.google/go/x/sys/+/v0.8.0:LICENSE))
+ - [golang.org/x/term](https://pkg.go.dev/golang.org/x/term) ([BSD-3-Clause](https://cs.opensource.google/go/x/term/+/v0.8.0:LICENSE))
+ - [golang.org/x/text](https://pkg.go.dev/golang.org/x/text) ([BSD-3-Clause](https://cs.opensource.google/go/x/text/+/v0.9.0:LICENSE))
  - [golang.zx2c4.com/wintun](https://pkg.go.dev/golang.zx2c4.com/wintun) ([MIT](https://git.zx2c4.com/wintun-go/tree/LICENSE?id=0fa3db229ce2))
  - [golang.zx2c4.com/wireguard/windows/tunnel/winipcfg](https://pkg.go.dev/golang.zx2c4.com/wireguard/windows/tunnel/winipcfg) ([MIT](https://git.zx2c4.com/wireguard-windows/tree/COPYING?h=v0.5.3))
  - [gopkg.in/Knetic/govaluate.v3](https://pkg.go.dev/gopkg.in/Knetic/govaluate.v3) ([MIT](https://github.com/Knetic/govaluate/blob/v3.0.0/LICENSE))
- - [gvisor.dev/gvisor/pkg](https://pkg.go.dev/gvisor.dev/gvisor/pkg) ([Apache-2.0](https://github.com/google/gvisor/blob/7b0a1988a28f/LICENSE))
  - [tailscale.com](https://pkg.go.dev/tailscale.com) ([BSD-3-Clause](https://github.com/tailscale/tailscale/blob/HEAD/LICENSE))
 
 ## Additional Dependencies

logtail/filch/filch_unix.go

@@ -1,7 +1,7 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
-//go:build !windows && !wasm
+//go:build !windows && !js
 
 package filch
 

metrics/metrics.go

@@ -45,14 +45,6 @@ func (m *LabelMap) Get(key string) *expvar.Int {
 	return m.Map.Get(key).(*expvar.Int)
 }
 
-// GetIncrFunc returns a function that increments the expvar.Int named by key.
-//
-// Most callers should not need this; it exists to satisfy an
-// interface elsewhere.
-func (m *LabelMap) GetIncrFunc(key string) func(delta int64) {
-	return m.Get(key).Add
-}
-
 // GetFloat returns a direct pointer to the expvar.Float for key, creating it
 // if necessary.
 func (m *LabelMap) GetFloat(key string) *expvar.Float {

metrics/metrics_test.go

@@ -11,18 +11,6 @@ import (
 	"tailscale.com/tstest"
 )
 
-func TestLabelMap(t *testing.T) {
-	var m LabelMap
-	m.GetIncrFunc("foo")(1)
-	m.GetIncrFunc("bar")(2)
-	if g, w := m.Get("foo").Value(), int64(1); g != w {
-		t.Errorf("foo = %v; want %v", g, w)
-	}
-	if g, w := m.Get("bar").Value(), int64(2); g != w {
-		t.Errorf("bar = %v; want %v", g, w)
-	}
-}
-
 func TestCurrentFileDescriptors(t *testing.T) {
 	if runtime.GOOS != "linux" {
 		t.Skipf("skipping on %v", runtime.GOOS)

net/dns/recursive/recursive.go

@@ -1,636 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-// Package recursive implements a simple recursive DNS resolver.
-package recursive
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"net"
-	"net/netip"
-	"strings"
-	"time"
-
-	"github.com/miekg/dns"
-	"golang.org/x/exp/constraints"
-	"golang.org/x/exp/slices"
-	"tailscale.com/envknob"
-	"tailscale.com/net/netns"
-	"tailscale.com/types/logger"
-	"tailscale.com/util/dnsname"
-	"tailscale.com/util/mak"
-	"tailscale.com/util/multierr"
-	"tailscale.com/util/slicesx"
-)
-
-const (
-	// maxDepth is how deep from the root nameservers we'll recurse when
-	// resolving; passing this limit will instead return an error.
-	//
-	// maxDepth must be at least 20 to resolve "console.aws.amazon.com",
-	// which is a domain with a moderately complicated DNS setup. The
-	// current value of 30 was chosen semi-arbitrarily to ensure that we
-	// have about 50% headroom.
-	maxDepth = 30
-	// numStartingServers is the number of root nameservers that we use as
-	// initial candidates for our recursion.
-	numStartingServers = 3
-	// udpQueryTimeout is the amount of time we wait for a UDP response
-	// from a nameserver before falling back to a TCP connection.
-	udpQueryTimeout = 5 * time.Second
-
-	// These constants aren't typed in the DNS package, so we create typed
-	// versions here to avoid having to do repeated type casts.
-	qtypeA    dns.Type = dns.Type(dns.TypeA)
-	qtypeAAAA dns.Type = dns.Type(dns.TypeAAAA)
-)
-
-var (
-	// ErrMaxDepth is returned when recursive resolving exceeds the maximum
-	// depth limit for this package.
-	ErrMaxDepth = fmt.Errorf("exceeded max depth %d when resolving", maxDepth)
-
-	// ErrAuthoritativeNoResponses is the error returned when an
-	// authoritative nameserver indicates that there are no responses to
-	// the given query.
-	ErrAuthoritativeNoResponses = errors.New("authoritative server returned no responses")
-
-	// ErrNoResponses is returned when our resolution process completes
-	// with no valid responses from any nameserver, but no authoritative
-	// server explicitly returned NXDOMAIN.
-	ErrNoResponses = errors.New("no responses to query")
-)
-
-var rootServersV4 = []netip.Addr{
-	netip.MustParseAddr("198.41.0.4"),     // a.root-servers.net
-	netip.MustParseAddr("199.9.14.201"),   // b.root-servers.net
-	netip.MustParseAddr("192.33.4.12"),    // c.root-servers.net
-	netip.MustParseAddr("199.7.91.13"),    // d.root-servers.net
-	netip.MustParseAddr("192.203.230.10"), // e.root-servers.net
-	netip.MustParseAddr("192.5.5.241"),    // f.root-servers.net
-	netip.MustParseAddr("192.112.36.4"),   // g.root-servers.net
-	netip.MustParseAddr("198.97.190.53"),  // h.root-servers.net
-	netip.MustParseAddr("192.36.148.17"),  // i.root-servers.net
-	netip.MustParseAddr("192.58.128.30"),  // j.root-servers.net
-	netip.MustParseAddr("193.0.14.129"),   // k.root-servers.net
-	netip.MustParseAddr("199.7.83.42"),    // l.root-servers.net
-	netip.MustParseAddr("202.12.27.33"),   // m.root-servers.net
-}
-
-var rootServersV6 = []netip.Addr{
-	netip.MustParseAddr("2001:503:ba3e::2:30"), // a.root-servers.net
-	netip.MustParseAddr("2001:500:200::b"),     // b.root-servers.net
-	netip.MustParseAddr("2001:500:2::c"),       // c.root-servers.net
-	netip.MustParseAddr("2001:500:2d::d"),      // d.root-servers.net
-	netip.MustParseAddr("2001:500:a8::e"),      // e.root-servers.net
-	netip.MustParseAddr("2001:500:2f::f"),      // f.root-servers.net
-	netip.MustParseAddr("2001:500:12::d0d"),    // g.root-servers.net
-	netip.MustParseAddr("2001:500:1::53"),      // h.root-servers.net
-	netip.MustParseAddr("2001:7fe::53"),        // i.root-servers.net
-	netip.MustParseAddr("2001:503:c27::2:30"),  // j.root-servers.net
-	netip.MustParseAddr("2001:7fd::1"),         // k.root-servers.net
-	netip.MustParseAddr("2001:500:9f::42"),     // l.root-servers.net
-	netip.MustParseAddr("2001:dc3::35"),        // m.root-servers.net
-}
-
-var debug = envknob.RegisterBool("TS_DEBUG_RECURSIVE_DNS")
-
-// Resolver is a recursive DNS resolver that is designed for looking up A and AAAA records.
-type Resolver struct {
-	// Dialer is used to create outbound connections. If nil, a zero
-	// net.Dialer will be used instead.
-	Dialer netns.Dialer
-
-	// Logf is the logging function to use; if none is specified, then logs
-	// will be dropped.
-	Logf logger.Logf
-
-	// NoIPv6, if set, will prevent this package from querying for AAAA
-	// records and will avoid contacting nameservers over IPv6.
-	NoIPv6 bool
-
-	// Test mocks
-	testQueryHook    func(name dnsname.FQDN, nameserver netip.Addr, protocol string, qtype dns.Type) (*dns.Msg, error)
-	testExchangeHook func(nameserver netip.Addr, network string, msg *dns.Msg) (*dns.Msg, error)
-	rootServers      []netip.Addr
-	timeNow          func() time.Time
-
-	// Caching
-	// NOTE(andrew): if we make resolution parallel, this needs a mutex
-	queryCache map[dnsQuery]dnsMsgWithExpiry
-
-	// Possible future additions:
-	//    - Additional nameservers? From the system maybe?
-	//    - NoIPv4 for IPv4
-	//    - DNS-over-HTTPS or DNS-over-TLS support
-}
-
-// queryState stores all state during the course of a single query
-type queryState struct {
-	// rootServers are the root nameservers to start from
-	rootServers []netip.Addr
-
-	// TODO: metrics?
-}
-
-type dnsQuery struct {
-	nameserver netip.Addr
-	name       dnsname.FQDN
-	qtype      dns.Type
-}
-
-func (q dnsQuery) String() string {
-	return fmt.Sprintf("dnsQuery{nameserver:%q,name:%q,qtype:%v}", q.nameserver.String(), q.name, q.qtype)
-}
-
-type dnsMsgWithExpiry struct {
-	*dns.Msg
-	expiresAt time.Time
-}
-
-func (r *Resolver) now() time.Time {
-	if r.timeNow != nil {
-		return r.timeNow()
-	}
-	return time.Now()
-}
-
-func (r *Resolver) logf(format string, args ...any) {
-	if r.Logf == nil {
-		return
-	}
-	r.Logf(format, args...)
-}
-
-func (r *Resolver) dlogf(format string, args ...any) {
-	if r.Logf == nil || !debug() {
-		return
-	}
-	r.Logf(format, args...)
-}
-
-func (r *Resolver) depthlogf(depth int, format string, args ...any) {
-	if r.Logf == nil || !debug() {
-		return
-	}
-	prefix := fmt.Sprintf("[%d] %s", depth, strings.Repeat("  ", depth))
-	r.Logf(prefix+format, args...)
-}
-
-var defaultDialer net.Dialer
-
-func (r *Resolver) dialer() netns.Dialer {
-	if r.Dialer != nil {
-		return r.Dialer
-	}
-
-	return &defaultDialer
-}
-
-func (r *Resolver) newState() *queryState {
-	var rootServers []netip.Addr
-	if len(r.rootServers) > 0 {
-		rootServers = r.rootServers
-	} else {
-		// Select a random subset of root nameservers to start from, since if
-		// we don't get responses from those, something else has probably gone
-		// horribly wrong.
-		roots4 := slices.Clone(rootServersV4)
-		slicesx.Shuffle(roots4)
-		roots4 = roots4[:numStartingServers]
-
-		var roots6 []netip.Addr
-		if !r.NoIPv6 {
-			roots6 = slices.Clone(rootServersV6)
-			slicesx.Shuffle(roots6)
-			roots6 = roots6[:numStartingServers]
-		}
-
-		// Interleave the root servers so that we try to contact them over
-		// IPv4, then IPv6, IPv4, IPv6, etc.
-		rootServers = slicesx.Interleave(roots4, roots6)
-	}
-
-	return &queryState{
-		rootServers: rootServers,
-	}
-}
-
-// Resolve will perform a recursive DNS resolution for the provided name,
-// starting at a randomly-chosen root DNS server, and return the A and AAAA
-// responses as a slice of netip.Addrs along with the minimum TTL for the
-// returned records.
-func (r *Resolver) Resolve(ctx context.Context, name string) (addrs []netip.Addr, minTTL time.Duration, err error) {
-	dnsName, err := dnsname.ToFQDN(name)
-	if err != nil {
-		return nil, 0, err
-	}
-
-	qstate := r.newState()
-
-	r.logf("querying IPv4 addresses for: %q", name)
-	addrs4, minTTL4, err4 := r.resolveRecursiveFromRoot(ctx, qstate, 0, dnsName, qtypeA)
-
-	var (
-		addrs6  []netip.Addr
-		minTTL6 time.Duration
-		err6    error
-	)
-	if !r.NoIPv6 {
-		r.logf("querying IPv6 addresses for: %q", name)
-		addrs6, minTTL6, err6 = r.resolveRecursiveFromRoot(ctx, qstate, 0, dnsName, qtypeAAAA)
-	}
-
-	if err4 != nil && err6 != nil {
-		if err4 == err6 {
-			return nil, 0, err4
-		}
-
-		return nil, 0, multierr.New(err4, err6)
-	}
-	if err4 != nil {
-		return addrs6, minTTL6, nil
-	} else if err6 != nil {
-		return addrs4, minTTL4, nil
-	}
-
-	minTTL = minTTL4
-	if minTTL6 < minTTL {
-		minTTL = minTTL6
-	}
-
-	addrs = append(addrs4, addrs6...)
-	if len(addrs) == 0 {
-		return nil, 0, ErrNoResponses
-	}
-
-	slicesx.Shuffle(addrs)
-	return addrs, minTTL, nil
-}
-
-func (r *Resolver) resolveRecursiveFromRoot(
-	ctx context.Context,
-	qstate *queryState,
-	depth int,
-	name dnsname.FQDN, // what we're querying
-	qtype dns.Type,
-) ([]netip.Addr, time.Duration, error) {
-	r.depthlogf(depth, "resolving %q from root (type: %v)", name, qtype)
-
-	var depthError bool
-	for _, server := range qstate.rootServers {
-		addrs, minTTL, err := r.resolveRecursive(ctx, qstate, depth, name, server, qtype)
-		if err == nil {
-			return addrs, minTTL, err
-		} else if errors.Is(err, ErrAuthoritativeNoResponses) {
-			return nil, 0, ErrAuthoritativeNoResponses
-		} else if errors.Is(err, ErrMaxDepth) {
-			depthError = true
-		}
-	}
-
-	if depthError {
-		return nil, 0, ErrMaxDepth
-	}
-	return nil, 0, ErrNoResponses
-}
-
-func (r *Resolver) resolveRecursive(
-	ctx context.Context,
-	qstate *queryState,
-	depth int,
-	name dnsname.FQDN, // what we're querying
-	nameserver netip.Addr,
-	qtype dns.Type,
-) ([]netip.Addr, time.Duration, error) {
-	if depth == maxDepth {
-		r.depthlogf(depth, "not recursing past maximum depth")
-		return nil, 0, ErrMaxDepth
-	}
-
-	// Ask this nameserver for an answer.
-	resp, err := r.queryNameserver(ctx, depth, name, nameserver, qtype)
-	if err != nil {
-		return nil, 0, err
-	}
-
-	// If we get an actual answer from the nameserver, then return it.
-	var (
-		answers []netip.Addr
-		cnames  []dnsname.FQDN
-		minTTL  = 24 * 60 * 60 // 24 hours in seconds
-	)
-	for _, answer := range resp.Answer {
-		if crec, ok := answer.(*dns.CNAME); ok {
-			cnameFQDN, err := dnsname.ToFQDN(crec.Target)
-			if err != nil {
-				r.logf("bad CNAME %q returned: %v", crec.Target, err)
-				continue
-			}
-
-			cnames = append(cnames, cnameFQDN)
-			continue
-		}
-
-		addr := addrFromRecord(answer)
-		if !addr.IsValid() {
-			r.logf("[unexpected] invalid record in %T answer", answer)
-		} else if addr.Is4() && qtype != qtypeA {
-			r.logf("[unexpected] got IPv4 answer but qtype=%v", qtype)
-		} else if addr.Is6() && qtype != qtypeAAAA {
-			r.logf("[unexpected] got IPv6 answer but qtype=%v", qtype)
-		} else {
-			answers = append(answers, addr)
-			minTTL = min(minTTL, int(answer.Header().Ttl))
-		}
-	}
-
-	if len(answers) > 0 {
-		r.depthlogf(depth, "got answers for %q: %v", name, answers)
-		return answers, time.Duration(minTTL) * time.Second, nil
-	}
-
-	r.depthlogf(depth, "no answers for %q", name)
-
-	// If we have a non-zero number of CNAMEs, then try resolving those
-	// (from the root again) and return the first one that succeeds.
-	//
-	// TODO: return the union of all responses?
-	// TODO: parallelism?
-	if len(cnames) > 0 {
-		r.depthlogf(depth, "got CNAME responses for %q: %v", name, cnames)
-	}
-	var cnameDepthError bool
-	for _, cname := range cnames {
-		answers, minTTL, err := r.resolveRecursiveFromRoot(ctx, qstate, depth+1, cname, qtype)
-		if err == nil {
-			return answers, minTTL, nil
-		} else if errors.Is(err, ErrAuthoritativeNoResponses) {
-			return nil, 0, ErrAuthoritativeNoResponses
-		} else if errors.Is(err, ErrMaxDepth) {
-			cnameDepthError = true
-		}
-	}
-
-	// If this is an authoritative response, then we know that continuing
-	// to look further is not going to result in any answers and we should
-	// bail out.
-	if resp.MsgHdr.Authoritative {
-		// If we failed to recurse into a CNAME due to a depth limit,
-		// propagate that here.
-		if cnameDepthError {
-			return nil, 0, ErrMaxDepth
-		}
-
-		r.depthlogf(depth, "got authoritative response with no answers; stopping")
-		return nil, 0, ErrAuthoritativeNoResponses
-	}
-
-	r.depthlogf(depth, "got %d NS responses and %d ADDITIONAL responses for %q", len(resp.Ns), len(resp.Extra), name)
-
-	// No CNAMEs and no answers; see if we got any AUTHORITY responses,
-	// which indicate which nameservers to query next.
-	var authorities []dnsname.FQDN
-	for _, rr := range resp.Ns {
-		ns, ok := rr.(*dns.NS)
-		if !ok {
-			continue
-		}
-
-		nsName, err := dnsname.ToFQDN(ns.Ns)
-		if err != nil {
-			r.logf("unexpected bad NS name %q: %v", ns.Ns, err)
-			continue
-		}
-
-		authorities = append(authorities, nsName)
-	}
-
-	// Also check for "glue" records, which are IP addresses provided by
-	// the DNS server for authority responses; these are required when the
-	// authority server is a subdomain of what's being resolved.
-	glueRecords := make(map[dnsname.FQDN][]netip.Addr)
-	for _, rr := range resp.Extra {
-		name, err := dnsname.ToFQDN(rr.Header().Name)
-		if err != nil {
-			r.logf("unexpected bad Name %q in Extra addr: %v", rr.Header().Name, err)
-			continue
-		}
-
-		if addr := addrFromRecord(rr); addr.IsValid() {
-			glueRecords[name] = append(glueRecords[name], addr)
-		} else {
-			r.logf("unexpected bad Extra %T addr", rr)
-		}
-	}
-
-	// Try authorities with glue records first, to minimize the number of
-	// additional DNS queries that we need to make.
-	authoritiesGlue, authoritiesNoGlue := slicesx.Partition(authorities, func(aa dnsname.FQDN) bool {
-		return len(glueRecords[aa]) > 0
-	})
-
-	authorityDepthError := false
-
-	r.depthlogf(depth, "authorities with glue records for recursion: %v", authoritiesGlue)
-	for _, authority := range authoritiesGlue {
-		for _, nameserver := range glueRecords[authority] {
-			answers, minTTL, err := r.resolveRecursive(ctx, qstate, depth+1, name, nameserver, qtype)
-			if err == nil {
-				return answers, minTTL, nil
-			} else if errors.Is(err, ErrAuthoritativeNoResponses) {
-				return nil, 0, ErrAuthoritativeNoResponses
-			} else if errors.Is(err, ErrMaxDepth) {
-				authorityDepthError = true
-			}
-		}
-	}
-
-	r.depthlogf(depth, "authorities with no glue records for recursion: %v", authoritiesNoGlue)
-	for _, authority := range authoritiesNoGlue {
-		// First, resolve the IP for the authority server from the
-		// root, querying for both IPv4 and IPv6 addresses regardless
-		// of what the current question type is.
-		//
-		// TODO: check for infinite recursion; it'll get caught by our
-		// recursion depth, but we want to bail early.
-		for _, authorityQtype := range []dns.Type{qtypeAAAA, qtypeA} {
-			answers, _, err := r.resolveRecursiveFromRoot(ctx, qstate, depth+1, authority, authorityQtype)
-			if err != nil {
-				r.depthlogf(depth, "error querying authority %q: %v", authority, err)
-				continue
-			}
-			r.depthlogf(depth, "resolved authority %q (type %v) to: %v", authority, authorityQtype, answers)
-
-			// Now, query this authority for the final address.
-			for _, nameserver := range answers {
-				answers, minTTL, err := r.resolveRecursive(ctx, qstate, depth+1, name, nameserver, qtype)
-				if err == nil {
-					return answers, minTTL, nil
-				} else if errors.Is(err, ErrAuthoritativeNoResponses) {
-					return nil, 0, ErrAuthoritativeNoResponses
-				} else if errors.Is(err, ErrMaxDepth) {
-					authorityDepthError = true
-				}
-			}
-		}
-	}
-
-	if authorityDepthError {
-		return nil, 0, ErrMaxDepth
-	}
-	return nil, 0, ErrNoResponses
-}
-
-func min[T constraints.Ordered](a, b T) T {
-	if a < b {
-		return a
-	}
-	return b
-}
-
-// queryNameserver sends a query for "name" to the nameserver "nameserver" for
-// records of type "qtype", trying both UDP and TCP connections as
-// appropriate.
-func (r *Resolver) queryNameserver(
-	ctx context.Context,
-	depth int,
-	name dnsname.FQDN, // what we're querying
-	nameserver netip.Addr, // destination of query
-	qtype dns.Type,
-) (*dns.Msg, error) {
-	// TODO(andrew): we should QNAME minimisation here to avoid sending the
-	// full name to intermediate/root nameservers. See:
-	//    https://www.rfc-editor.org/rfc/rfc7816
-
-	// Handle the case where UDP is blocked by adding an explicit timeout
-	// for the UDP portion of this query.
-	udpCtx, udpCtxCancel := context.WithTimeout(ctx, udpQueryTimeout)
-	defer udpCtxCancel()
-
-	msg, err := r.queryNameserverProto(udpCtx, depth, name, nameserver, "udp", qtype)
-	if err == nil {
-		return msg, nil
-	}
-
-	msg, err2 := r.queryNameserverProto(ctx, depth, name, nameserver, "tcp", qtype)
-	if err2 == nil {
-		return msg, nil
-	}
-
-	return nil, multierr.New(err, err2)
-}
-
-// queryNameserverProto sends a query for "name" to the nameserver "nameserver"
-// for records of type "qtype" over the provided protocol (either "udp"
-// or "tcp"), and returns the DNS response or an error.
-func (r *Resolver) queryNameserverProto(
-	ctx context.Context,
-	depth int,
-	name dnsname.FQDN, // what we're querying
-	nameserver netip.Addr, // destination of query
-	protocol string,
-	qtype dns.Type,
-) (resp *dns.Msg, err error) {
-	if r.testQueryHook != nil {
-		return r.testQueryHook(name, nameserver, protocol, qtype)
-	}
-
-	now := r.now()
-	nameserverStr := nameserver.String()
-
-	cacheKey := dnsQuery{
-		nameserver: nameserver,
-		name:       name,
-		qtype:      qtype,
-	}
-	cacheEntry, ok := r.queryCache[cacheKey]
-	if ok && cacheEntry.expiresAt.Before(now) {
-		r.depthlogf(depth, "using cached response from %s about %q (type: %v)", nameserverStr, name, qtype)
-		return cacheEntry.Msg, nil
-	}
-
-	var network string
-	if nameserver.Is4() {
-		network = protocol + "4"
-	} else {
-		network = protocol + "6"
-	}
-
-	// Prepare a message asking for an appropriately-typed record
-	// for the name we're querying.
-	m := new(dns.Msg)
-	m.SetQuestion(name.WithTrailingDot(), uint16(qtype))
-
-	// Allow mocking out the network components with our exchange hook.
-	if r.testExchangeHook != nil {
-		resp, err = r.testExchangeHook(nameserver, network, m)
-	} else {
-		// Dial the current nameserver using our dialer.
-		var nconn net.Conn
-		nconn, err = r.dialer().DialContext(ctx, network, net.JoinHostPort(nameserverStr, "53"))
-		if err != nil {
-			return nil, err
-		}
-
-		var c dns.Client // TODO: share?
-		conn := &dns.Conn{
-			Conn:    nconn,
-			UDPSize: c.UDPSize,
-		}
-
-		// Send the DNS request to the current nameserver.
-		r.depthlogf(depth, "asking %s over %s about %q (type: %v)", nameserverStr, protocol, name, qtype)
-		resp, _, err = c.ExchangeWithConnContext(ctx, m, conn)
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	// If the message was truncated and we're using UDP, re-run with TCP.
-	if resp.MsgHdr.Truncated && protocol == "udp" {
-		r.depthlogf(depth, "response message truncated; re-running query with TCP")
-		resp, err = r.queryNameserverProto(ctx, depth, name, nameserver, "tcp", qtype)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	// Find minimum expiry for all records in this message.
-	var minTTL int
-	for _, rr := range resp.Answer {
-		minTTL = min(minTTL, int(rr.Header().Ttl))
-	}
-	for _, rr := range resp.Ns {
-		minTTL = min(minTTL, int(rr.Header().Ttl))
-	}
-	for _, rr := range resp.Extra {
-		minTTL = min(minTTL, int(rr.Header().Ttl))
-	}
-
-	mak.Set(&r.queryCache, cacheKey, dnsMsgWithExpiry{
-		Msg:       resp,
-		expiresAt: now.Add(time.Duration(minTTL) * time.Second),
-	})
-	return resp, nil
-}
-
-func addrFromRecord(rr dns.RR) netip.Addr {
-	switch v := rr.(type) {
-	case *dns.A:
-		ip, ok := netip.AddrFromSlice(v.A)
-		if !ok || !ip.Is4() {
-			return netip.Addr{}
-		}
-		return ip
-	case *dns.AAAA:
-		ip, ok := netip.AddrFromSlice(v.AAAA)
-		if !ok || !ip.Is6() {
-			return netip.Addr{}
-		}
-		return ip
-	}
-	return netip.Addr{}
-}

net/dns/recursive/recursive_test.go

@@ -1,741 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-package recursive
-
-import (
-	"context"
-	"errors"
-	"flag"
-	"fmt"
-	"net"
-	"net/netip"
-	"reflect"
-	"strings"
-	"testing"
-	"time"
-
-	"github.com/miekg/dns"
-	"golang.org/x/exp/slices"
-	"tailscale.com/envknob"
-	"tailscale.com/tstest"
-)
-
-const testDomain = "tailscale.com"
-
-// Recursively resolving the AWS console requires being able to handle CNAMEs,
-// glue records, falling back from UDP to TCP for oversize queries, and more;
-// it's a great integration test for DNS resolution and they can handle the
-// traffic :)
-const complicatedTestDomain = "console.aws.amazon.com"
-
-var flagNetworkAccess = flag.Bool("enable-network-access", false, "run tests that need external network access")
-
-func init() {
-	envknob.Setenv("TS_DEBUG_RECURSIVE_DNS", "true")
-}
-
-func newResolver(tb testing.TB) *Resolver {
-	clock := tstest.NewClock(tstest.ClockOpts{
-		Step: 50 * time.Millisecond,
-	})
-	return &Resolver{
-		Logf:    tb.Logf,
-		timeNow: clock.Now,
-	}
-}
-
-func TestResolve(t *testing.T) {
-	if !*flagNetworkAccess {
-		t.SkipNow()
-	}
-
-	ctx := context.Background()
-	r := newResolver(t)
-	addrs, minTTL, err := r.Resolve(ctx, testDomain)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	t.Logf("addrs: %+v", addrs)
-	t.Logf("minTTL: %v", minTTL)
-	if len(addrs) < 1 {
-		t.Fatalf("expected at least one address")
-	}
-
-	if minTTL <= 10*time.Second || minTTL >= 24*time.Hour {
-		t.Errorf("invalid minimum TTL: %v", minTTL)
-	}
-
-	var has4, has6 bool
-	for _, addr := range addrs {
-		has4 = has4 || addr.Is4()
-		has6 = has6 || addr.Is6()
-	}
-
-	if !has4 {
-		t.Errorf("expected at least one IPv4 address")
-	}
-	if !has6 {
-		t.Errorf("expected at least one IPv6 address")
-	}
-}
-
-func TestResolveComplicated(t *testing.T) {
-	if !*flagNetworkAccess {
-		t.SkipNow()
-	}
-
-	ctx := context.Background()
-	r := newResolver(t)
-	addrs, minTTL, err := r.Resolve(ctx, complicatedTestDomain)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	t.Logf("addrs: %+v", addrs)
-	t.Logf("minTTL: %v", minTTL)
-	if len(addrs) < 1 {
-		t.Fatalf("expected at least one address")
-	}
-
-	if minTTL <= 10*time.Second || minTTL >= 24*time.Hour {
-		t.Errorf("invalid minimum TTL: %v", minTTL)
-	}
-}
-
-func TestResolveNoIPv6(t *testing.T) {
-	if !*flagNetworkAccess {
-		t.SkipNow()
-	}
-
-	r := newResolver(t)
-	r.NoIPv6 = true
-
-	addrs, _, err := r.Resolve(context.Background(), testDomain)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	t.Logf("addrs: %+v", addrs)
-	if len(addrs) < 1 {
-		t.Fatalf("expected at least one address")
-	}
-
-	for _, addr := range addrs {
-		if addr.Is6() {
-			t.Errorf("got unexpected IPv6 address: %v", addr)
-		}
-	}
-}
-
-func TestResolveFallbackToTCP(t *testing.T) {
-	var udpCalls, tcpCalls int
-	hook := func(nameserver netip.Addr, network string, req *dns.Msg) (*dns.Msg, error) {
-		if strings.HasPrefix(network, "udp") {
-			t.Logf("got %q query; returning truncated result", network)
-			udpCalls++
-			resp := &dns.Msg{}
-			resp.SetReply(req)
-			resp.Truncated = true
-			return resp, nil
-		}
-
-		t.Logf("got %q query; returning real result", network)
-		tcpCalls++
-		resp := &dns.Msg{}
-		resp.SetReply(req)
-		resp.Answer = append(resp.Answer, &dns.A{
-			Hdr: dns.RR_Header{
-				Name:   req.Question[0].Name,
-				Rrtype: req.Question[0].Qtype,
-				Class:  dns.ClassINET,
-				Ttl:    300,
-			},
-			A: net.IPv4(1, 2, 3, 4),
-		})
-		return resp, nil
-	}
-
-	r := newResolver(t)
-	r.testExchangeHook = hook
-
-	ctx := context.Background()
-	resp, err := r.queryNameserverProto(ctx, 0, "tailscale.com", netip.MustParseAddr("9.9.9.9"), "udp", dns.Type(dns.TypeA))
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if len(resp.Answer) < 1 {
-		t.Fatalf("no answers in response: %v", resp)
-	}
-	rrA, ok := resp.Answer[0].(*dns.A)
-	if !ok {
-		t.Fatalf("invalid RR type: %T", resp.Answer[0])
-	}
-	if !rrA.A.Equal(net.IPv4(1, 2, 3, 4)) {
-		t.Errorf("wanted A response 1.2.3.4, got: %v", rrA.A)
-	}
-	if tcpCalls != 1 {
-		t.Errorf("got %d, want 1 TCP calls", tcpCalls)
-	}
-	if udpCalls != 1 {
-		t.Errorf("got %d, want 1 UDP calls", udpCalls)
-	}
-
-	// Verify that we're cached and re-run to fetch from the cache.
-	if len(r.queryCache) < 1 {
-		t.Errorf("wanted entries in the query cache")
-	}
-
-	resp2, err := r.queryNameserverProto(ctx, 0, "tailscale.com", netip.MustParseAddr("9.9.9.9"), "udp", dns.Type(dns.TypeA))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !reflect.DeepEqual(resp, resp2) {
-		t.Errorf("expected equal responses; old=%+v new=%+v", resp, resp2)
-	}
-
-	// We didn't make any more network requests since we loaded from the cache.
-	if tcpCalls != 1 {
-		t.Errorf("got %d, want 1 TCP calls", tcpCalls)
-	}
-	if udpCalls != 1 {
-		t.Errorf("got %d, want 1 UDP calls", udpCalls)
-	}
-}
-
-func dnsIPRR(name string, addr netip.Addr) dns.RR {
-	if addr.Is4() {
-		return &dns.A{
-			Hdr: dns.RR_Header{
-				Name:   name,
-				Rrtype: dns.TypeA,
-				Class:  dns.ClassINET,
-				Ttl:    300,
-			},
-			A: net.IP(addr.AsSlice()),
-		}
-	}
-
-	return &dns.AAAA{
-		Hdr: dns.RR_Header{
-			Name:   name,
-			Rrtype: dns.TypeAAAA,
-			Class:  dns.ClassINET,
-			Ttl:    300,
-		},
-		AAAA: net.IP(addr.AsSlice()),
-	}
-}
-
-func cnameRR(name, target string) dns.RR {
-	return &dns.CNAME{
-		Hdr: dns.RR_Header{
-			Name:   name,
-			Rrtype: dns.TypeCNAME,
-			Class:  dns.ClassINET,
-			Ttl:    300,
-		},
-		Target: target,
-	}
-}
-
-func nsRR(name, target string) dns.RR {
-	return &dns.NS{
-		Hdr: dns.RR_Header{
-			Name:   name,
-			Rrtype: dns.TypeNS,
-			Class:  dns.ClassINET,
-			Ttl:    300,
-		},
-		Ns: target,
-	}
-}
-
-type mockReply struct {
-	name  string
-	qtype dns.Type
-	resp  *dns.Msg
-}
-
-type replyMock struct {
-	tb      testing.TB
-	replies map[netip.Addr][]mockReply
-}
-
-func (r *replyMock) exchangeHook(nameserver netip.Addr, network string, req *dns.Msg) (*dns.Msg, error) {
-	if len(req.Question) != 1 {
-		r.tb.Fatalf("unsupported multiple or empty question: %v", req.Question)
-	}
-	question := req.Question[0]
-
-	replies := r.replies[nameserver]
-	if len(replies) == 0 {
-		r.tb.Fatalf("no configured replies for nameserver: %v", nameserver)
-	}
-
-	for _, reply := range replies {
-		if reply.name == question.Name && reply.qtype == dns.Type(question.Qtype) {
-			return reply.resp.Copy(), nil
-		}
-	}
-
-	r.tb.Fatalf("no replies found for query %q of type %v to %v", question.Name, question.Qtype, nameserver)
-	panic("unreachable")
-}
-
-// responses for mocking, shared between the following tests
-var (
-	rootServerAddr = netip.MustParseAddr("198.41.0.4") // a.root-servers.net.
-	comNSAddr      = netip.MustParseAddr("192.5.6.30") // a.gtld-servers.net.
-
-	// DNS response from the root nameservers for a .com nameserver
-	comRecord = &dns.Msg{
-		Ns:    []dns.RR{nsRR("com.", "a.gtld-servers.net.")},
-		Extra: []dns.RR{dnsIPRR("a.gtld-servers.net.", comNSAddr)},
-	}
-
-	// Random Amazon nameservers that we use in glue records
-	amazonNS   = netip.MustParseAddr("205.251.192.197")
-	amazonNSv6 = netip.MustParseAddr("2600:9000:5306:1600::1")
-
-	// Nameservers for the tailscale.com domain
-	tailscaleNameservers = &dns.Msg{
-		Ns: []dns.RR{
-			nsRR("tailscale.com.", "ns-197.awsdns-24.com."),
-			nsRR("tailscale.com.", "ns-557.awsdns-05.net."),
-			nsRR("tailscale.com.", "ns-1558.awsdns-02.co.uk."),
-			nsRR("tailscale.com.", "ns-1359.awsdns-41.org."),
-		},
-		Extra: []dns.RR{
-			dnsIPRR("ns-197.awsdns-24.com.", amazonNS),
-		},
-	}
-)
-
-func TestBasicRecursion(t *testing.T) {
-	mock := &replyMock{
-		tb: t,
-		replies: map[netip.Addr][]mockReply{
-			// Query to the root server returns the .com server + a glue record
-			rootServerAddr: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: comRecord},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: comRecord},
-			},
-
-			// Query to the ".com" server return the nameservers for tailscale.com
-			comNSAddr: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: tailscaleNameservers},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: tailscaleNameservers},
-			},
-
-			// Query to the actual nameserver works.
-			amazonNS: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{
-						dnsIPRR("tailscale.com.", netip.MustParseAddr("13.248.141.131")),
-						dnsIPRR("tailscale.com.", netip.MustParseAddr("76.223.15.28")),
-					},
-				}},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{
-						dnsIPRR("tailscale.com.", netip.MustParseAddr("2600:9000:a602:b1e6:86d:8165:5e8c:295b")),
-						dnsIPRR("tailscale.com.", netip.MustParseAddr("2600:9000:a51d:27c1:1530:b9ef:2a6:b9e5")),
-					},
-				}},
-			},
-		},
-	}
-
-	r := newResolver(t)
-	r.testExchangeHook = mock.exchangeHook
-	r.rootServers = []netip.Addr{rootServerAddr}
-
-	// Query for tailscale.com, verify we get the right responses
-	ctx := context.Background()
-	addrs, minTTL, err := r.Resolve(ctx, "tailscale.com")
-	if err != nil {
-		t.Fatal(err)
-	}
-	wantAddrs := []netip.Addr{
-		netip.MustParseAddr("13.248.141.131"),
-		netip.MustParseAddr("76.223.15.28"),
-		netip.MustParseAddr("2600:9000:a602:b1e6:86d:8165:5e8c:295b"),
-		netip.MustParseAddr("2600:9000:a51d:27c1:1530:b9ef:2a6:b9e5"),
-	}
-	slices.SortFunc(addrs, func(x, y netip.Addr) bool { return x.String() < y.String() })
-	slices.SortFunc(wantAddrs, func(x, y netip.Addr) bool { return x.String() < y.String() })
-
-	if !reflect.DeepEqual(addrs, wantAddrs) {
-		t.Errorf("got addrs=%+v; want %+v", addrs, wantAddrs)
-	}
-
-	const wantMinTTL = 5 * time.Minute
-	if minTTL != wantMinTTL {
-		t.Errorf("got minTTL=%+v; want %+v", minTTL, wantMinTTL)
-	}
-}
-
-func TestNoAnswers(t *testing.T) {
-	mock := &replyMock{
-		tb: t,
-		replies: map[netip.Addr][]mockReply{
-			// Query to the root server returns the .com server + a glue record
-			rootServerAddr: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: comRecord},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: comRecord},
-			},
-
-			// Query to the ".com" server return the nameservers for tailscale.com
-			comNSAddr: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: tailscaleNameservers},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: tailscaleNameservers},
-			},
-
-			// Query to the actual nameserver returns no responses, authoritatively.
-			amazonNS: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{},
-				}},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{},
-				}},
-			},
-		},
-	}
-
-	r := &Resolver{
-		Logf:             t.Logf,
-		testExchangeHook: mock.exchangeHook,
-		rootServers:      []netip.Addr{rootServerAddr},
-	}
-
-	// Query for tailscale.com, verify we get the right responses
-	_, _, err := r.Resolve(context.Background(), "tailscale.com")
-	if err == nil {
-		t.Fatalf("got no error, want error")
-	}
-	if !errors.Is(err, ErrAuthoritativeNoResponses) {
-		t.Fatalf("got err=%v, want %v", err, ErrAuthoritativeNoResponses)
-	}
-}
-
-func TestRecursionCNAME(t *testing.T) {
-	mock := &replyMock{
-		tb: t,
-		replies: map[netip.Addr][]mockReply{
-			// Query to the root server returns the .com server + a glue record
-			rootServerAddr: {
-				{name: "subdomain.otherdomain.com.", qtype: dns.Type(dns.TypeA), resp: comRecord},
-				{name: "subdomain.otherdomain.com.", qtype: dns.Type(dns.TypeAAAA), resp: comRecord},
-
-				{name: "subdomain.tailscale.com.", qtype: dns.Type(dns.TypeA), resp: comRecord},
-				{name: "subdomain.tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: comRecord},
-			},
-
-			// Query to the ".com" server return the nameservers for tailscale.com
-			comNSAddr: {
-				{name: "subdomain.otherdomain.com.", qtype: dns.Type(dns.TypeA), resp: tailscaleNameservers},
-				{name: "subdomain.otherdomain.com.", qtype: dns.Type(dns.TypeAAAA), resp: tailscaleNameservers},
-
-				{name: "subdomain.tailscale.com.", qtype: dns.Type(dns.TypeA), resp: tailscaleNameservers},
-				{name: "subdomain.tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: tailscaleNameservers},
-			},
-
-			// Query to the actual nameserver works.
-			amazonNS: {
-				{name: "subdomain.otherdomain.com.", qtype: dns.Type(dns.TypeA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{cnameRR("subdomain.otherdomain.com.", "subdomain.tailscale.com.")},
-				}},
-				{name: "subdomain.otherdomain.com.", qtype: dns.Type(dns.TypeAAAA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{cnameRR("subdomain.otherdomain.com.", "subdomain.tailscale.com.")},
-				}},
-
-				{name: "subdomain.tailscale.com.", qtype: dns.Type(dns.TypeA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{dnsIPRR("tailscale.com.", netip.MustParseAddr("13.248.141.131"))},
-				}},
-				{name: "subdomain.tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{dnsIPRR("tailscale.com.", netip.MustParseAddr("2600:9000:a602:b1e6:86d:8165:5e8c:295b"))},
-				}},
-			},
-		},
-	}
-
-	r := &Resolver{
-		Logf:             t.Logf,
-		testExchangeHook: mock.exchangeHook,
-		rootServers:      []netip.Addr{rootServerAddr},
-	}
-
-	// Query for tailscale.com, verify we get the right responses
-	addrs, minTTL, err := r.Resolve(context.Background(), "subdomain.otherdomain.com")
-	if err != nil {
-		t.Fatal(err)
-	}
-	wantAddrs := []netip.Addr{
-		netip.MustParseAddr("13.248.141.131"),
-		netip.MustParseAddr("2600:9000:a602:b1e6:86d:8165:5e8c:295b"),
-	}
-	slices.SortFunc(addrs, func(x, y netip.Addr) bool { return x.String() < y.String() })
-	slices.SortFunc(wantAddrs, func(x, y netip.Addr) bool { return x.String() < y.String() })
-
-	if !reflect.DeepEqual(addrs, wantAddrs) {
-		t.Errorf("got addrs=%+v; want %+v", addrs, wantAddrs)
-	}
-
-	const wantMinTTL = 5 * time.Minute
-	if minTTL != wantMinTTL {
-		t.Errorf("got minTTL=%+v; want %+v", minTTL, wantMinTTL)
-	}
-}
-
-func TestRecursionNoGlue(t *testing.T) {
-	coukNS := netip.MustParseAddr("213.248.216.1")
-	coukRecord := &dns.Msg{
-		Ns:    []dns.RR{nsRR("com.", "dns1.nic.uk.")},
-		Extra: []dns.RR{dnsIPRR("dns1.nic.uk.", coukNS)},
-	}
-
-	intermediateNS := netip.MustParseAddr("205.251.193.66") // g-ns-322.awsdns-02.co.uk.
-	intermediateRecord := &dns.Msg{
-		Ns:    []dns.RR{nsRR("awsdns-02.co.uk.", "g-ns-322.awsdns-02.co.uk.")},
-		Extra: []dns.RR{dnsIPRR("g-ns-322.awsdns-02.co.uk.", intermediateNS)},
-	}
-
-	const amazonNameserver = "ns-1558.awsdns-02.co.uk."
-	tailscaleNameservers := &dns.Msg{
-		Ns: []dns.RR{
-			nsRR("tailscale.com.", amazonNameserver),
-		},
-	}
-
-	tailscaleResponses := []mockReply{
-		{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: &dns.Msg{
-			MsgHdr: dns.MsgHdr{Authoritative: true},
-			Answer: []dns.RR{dnsIPRR("tailscale.com.", netip.MustParseAddr("13.248.141.131"))},
-		}},
-		{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: &dns.Msg{
-			MsgHdr: dns.MsgHdr{Authoritative: true},
-			Answer: []dns.RR{dnsIPRR("tailscale.com.", netip.MustParseAddr("2600:9000:a602:b1e6:86d:8165:5e8c:295b"))},
-		}},
-	}
-
-	mock := &replyMock{
-		tb: t,
-		replies: map[netip.Addr][]mockReply{
-			rootServerAddr: {
-				// Query to the root server returns the .com server + a glue record
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: comRecord},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: comRecord},
-
-				// Querying the .co.uk nameserver returns the .co.uk nameserver + a glue record.
-				{name: amazonNameserver, qtype: dns.Type(dns.TypeA), resp: coukRecord},
-				{name: amazonNameserver, qtype: dns.Type(dns.TypeAAAA), resp: coukRecord},
-			},
-
-			// Queries to the ".com" server return the nameservers
-			// for tailscale.com, which don't contain a glue
-			// record.
-			comNSAddr: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: tailscaleNameservers},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: tailscaleNameservers},
-			},
-
-			// Queries to the ".co.uk" nameserver returns the
-			// address of the intermediate Amazon nameserver.
-			coukNS: {
-				{name: amazonNameserver, qtype: dns.Type(dns.TypeA), resp: intermediateRecord},
-				{name: amazonNameserver, qtype: dns.Type(dns.TypeAAAA), resp: intermediateRecord},
-			},
-
-			// Queries to the intermediate nameserver returns an
-			// answer for the final Amazon nameserver.
-			intermediateNS: {
-				{name: amazonNameserver, qtype: dns.Type(dns.TypeA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{dnsIPRR(amazonNameserver, amazonNS)},
-				}},
-				{name: amazonNameserver, qtype: dns.Type(dns.TypeAAAA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{dnsIPRR(amazonNameserver, amazonNSv6)},
-				}},
-			},
-
-			// Queries to the actual nameserver work and return
-			// responses to the query.
-			amazonNS:   tailscaleResponses,
-			amazonNSv6: tailscaleResponses,
-		},
-	}
-
-	r := newResolver(t)
-	r.testExchangeHook = mock.exchangeHook
-	r.rootServers = []netip.Addr{rootServerAddr}
-
-	// Query for tailscale.com, verify we get the right responses
-	addrs, minTTL, err := r.Resolve(context.Background(), "tailscale.com")
-	if err != nil {
-		t.Fatal(err)
-	}
-	wantAddrs := []netip.Addr{
-		netip.MustParseAddr("13.248.141.131"),
-		netip.MustParseAddr("2600:9000:a602:b1e6:86d:8165:5e8c:295b"),
-	}
-	slices.SortFunc(addrs, func(x, y netip.Addr) bool { return x.String() < y.String() })
-	slices.SortFunc(wantAddrs, func(x, y netip.Addr) bool { return x.String() < y.String() })
-
-	if !reflect.DeepEqual(addrs, wantAddrs) {
-		t.Errorf("got addrs=%+v; want %+v", addrs, wantAddrs)
-	}
-
-	const wantMinTTL = 5 * time.Minute
-	if minTTL != wantMinTTL {
-		t.Errorf("got minTTL=%+v; want %+v", minTTL, wantMinTTL)
-	}
-}
-
-func TestRecursionLimit(t *testing.T) {
-	mock := &replyMock{
-		tb:      t,
-		replies: map[netip.Addr][]mockReply{},
-	}
-
-	// Fill out a CNAME chain equal to our recursion limit; we won't get
-	// this far since each CNAME is more than 1 level "deep", but this
-	// ensures that we have more than the limit.
-	for i := 0; i < maxDepth+1; i++ {
-		curr := fmt.Sprintf("%d-tailscale.com.", i)
-
-		tailscaleNameservers := &dns.Msg{
-			Ns:    []dns.RR{nsRR(curr, "ns-197.awsdns-24.com.")},
-			Extra: []dns.RR{dnsIPRR("ns-197.awsdns-24.com.", amazonNS)},
-		}
-
-		// Query to the root server returns the .com server + a glue record
-		mock.replies[rootServerAddr] = append(mock.replies[rootServerAddr],
-			mockReply{name: curr, qtype: dns.Type(dns.TypeA), resp: comRecord},
-			mockReply{name: curr, qtype: dns.Type(dns.TypeAAAA), resp: comRecord},
-		)
-
-		// Query to the ".com" server return the nameservers for NN-tailscale.com
-		mock.replies[comNSAddr] = append(mock.replies[comNSAddr],
-			mockReply{name: curr, qtype: dns.Type(dns.TypeA), resp: tailscaleNameservers},
-			mockReply{name: curr, qtype: dns.Type(dns.TypeAAAA), resp: tailscaleNameservers},
-		)
-
-		// Queries to the nameserver return a CNAME for the n+1th server.
-		next := fmt.Sprintf("%d-tailscale.com.", i+1)
-		mock.replies[amazonNS] = append(mock.replies[amazonNS],
-			mockReply{
-				name:  curr,
-				qtype: dns.Type(dns.TypeA),
-				resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{cnameRR(curr, next)},
-				},
-			},
-			mockReply{
-				name:  curr,
-				qtype: dns.Type(dns.TypeAAAA),
-				resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{cnameRR(curr, next)},
-				},
-			},
-		)
-	}
-
-	r := newResolver(t)
-	r.testExchangeHook = mock.exchangeHook
-	r.rootServers = []netip.Addr{rootServerAddr}
-
-	// Query for the first node in the chain, 0-tailscale.com, and verify
-	// we get a max-depth error.
-	ctx := context.Background()
-	_, _, err := r.Resolve(ctx, "0-tailscale.com")
-	if err == nil {
-		t.Fatal("expected error, got nil")
-	} else if !errors.Is(err, ErrMaxDepth) {
-		t.Fatalf("got err=%v, want ErrMaxDepth", err)
-	}
-}
-
-func TestInvalidResponses(t *testing.T) {
-	mock := &replyMock{
-		tb: t,
-		replies: map[netip.Addr][]mockReply{
-			// Query to the root server returns the .com server + a glue record
-			rootServerAddr: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: comRecord},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: comRecord},
-			},
-
-			// Query to the ".com" server return the nameservers for tailscale.com
-			comNSAddr: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: tailscaleNameservers},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: tailscaleNameservers},
-			},
-
-			// Query to the actual nameserver returns an invalid IP address
-			amazonNS: {
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					Answer: []dns.RR{&dns.A{
-						Hdr: dns.RR_Header{
-							Name:   "tailscale.com.",
-							Rrtype: dns.TypeA,
-							Class:  dns.ClassINET,
-							Ttl:    300,
-						},
-						// Note: this is an IPv6 addr in an IPv4 response
-						A: net.IP(netip.MustParseAddr("2600:9000:a51d:27c1:1530:b9ef:2a6:b9e5").AsSlice()),
-					}},
-				}},
-				{name: "tailscale.com.", qtype: dns.Type(dns.TypeAAAA), resp: &dns.Msg{
-					MsgHdr: dns.MsgHdr{Authoritative: true},
-					// This an IPv4 response to an IPv6 query
-					Answer: []dns.RR{&dns.A{
-						Hdr: dns.RR_Header{
-							Name:   "tailscale.com.",
-							Rrtype: dns.TypeA,
-							Class:  dns.ClassINET,
-							Ttl:    300,
-						},
-						A: net.IP(netip.MustParseAddr("13.248.141.131").AsSlice()),
-					}},
-				}},
-			},
-		},
-	}
-
-	r := &Resolver{
-		Logf:             t.Logf,
-		testExchangeHook: mock.exchangeHook,
-		rootServers:      []netip.Addr{rootServerAddr},
-	}
-
-	// Query for tailscale.com, verify we get no responses since the
-	// addresses are invalid.
-	_, _, err := r.Resolve(context.Background(), "tailscale.com")
-	if err == nil {
-		t.Fatalf("got no error, want error")
-	}
-	if !errors.Is(err, ErrAuthoritativeNoResponses) {
-		t.Fatalf("got err=%v, want %v", err, ErrAuthoritativeNoResponses)
-	}
-}
-
-// TODO(andrew): test for more edge cases that aren't currently covered:
-//	* Nameservers that cross between IPv4 and IPv6
-//	* Authoritative no replies after following CNAME
-//	* Authoritative no replies after following non-glue NS record
-//	* Error querying non-glue NS record followed by success

net/dns/resolver/tsdns.go

@@ -724,7 +724,7 @@ func (r *Resolver) parseViaDomain(domain dnsname.FQDN, typ dns.Type) (netip.Addr
 		return netip.Addr{}, false // badly formed, don't respond
 	}
 
-	// MapVia will never error when given an IPv4 netip.Prefix.
+	// MapVia will never error when given an ipv4 netip.Prefix.
 	out, _ := tsaddr.MapVia(uint32(prefix), netip.PrefixFrom(ip4, ip4.BitLen()))
 	return out.Addr(), true
 }

net/dnscache/messagecache_test.go

@@ -18,9 +18,9 @@ import (
 )
 
 func TestMessageCache(t *testing.T) {
-	clock := tstest.NewClock(tstest.ClockOpts{
+	clock := &tstest.Clock{
 		Start: time.Date(1987, 11, 1, 0, 0, 0, 0, time.UTC),
-	})
+	}
 	mc := &MessageCache{Clock: clock.Now}
 	mc.SetMaxCacheSize(2)
 	clock.Advance(time.Second)

net/memnet/listener.go

@@ -22,10 +22,6 @@ type Listener struct {
 	ch        chan Conn
 	closeOnce sync.Once
 	closed    chan struct{}
-
-	// NewConn, if non-nil, is called to create a new pair of connections
-	// when dialing. If nil, NewConn is used.
-	NewConn func(network, addr string, maxBuf int) (Conn, Conn)
 }
 
 // Listen returns a new Listener for the provided address.
@@ -74,14 +70,7 @@ func (l *Listener) Dial(ctx context.Context, network, addr string) (_ net.Conn,
 			Addr: addr,
 		}
 	}
-
-	newConn := l.NewConn
-	if newConn == nil {
-		newConn = func(network, addr string, maxBuf int) (Conn, Conn) {
-			return NewConn(addr, maxBuf)
-		}
-	}
-	c, s := newConn(network, addr, bufferSize)
+	c, s := NewConn(addr, bufferSize)
 	defer func() {
 		if err != nil {
 			c.Close()

net/netmon/netmon_linux.go

@@ -100,7 +100,7 @@ func (c *nlConn) Receive() (message, error) {
 				typ = "RTM_DELADDR"
 			}
 
-			// label attributes are seemingly only populated for IPv4 addresses in the wild.
+			// label attributes are seemingly only populated for ipv4 addresses in the wild.
 			label := rmsg.Attributes.Label
 			if label == "" {
 				itf, err := net.InterfaceByIndex(int(rmsg.Index))

net/netns/netns_linux.go

@@ -17,9 +17,16 @@ import (
 	"tailscale.com/net/interfaces"
 	"tailscale.com/net/netmon"
 	"tailscale.com/types/logger"
-	"tailscale.com/util/linuxfw"
 )
 
+// tailscaleBypassMark is the mark indicating that packets originating
+// from a socket should bypass Tailscale-managed routes during routing
+// table lookups.
+//
+// Keep this in sync with tailscaleBypassMark in
+// wgengine/router/router_linux.go.
+const tailscaleBypassMark = 0x80000
+
 // socketMarkWorksOnce is the sync.Once & cached value for useSocketMark.
 var socketMarkWorksOnce struct {
 	sync.Once
@@ -112,7 +119,7 @@ func controlC(network, address string, c syscall.RawConn) error {
 }
 
 func setBypassMark(fd uintptr) error {
-	if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_MARK, linuxfw.TailscaleBypassMarkNum); err != nil {
+	if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_MARK, tailscaleBypassMark); err != nil {
 		return fmt.Errorf("setting SO_MARK bypass: %w", err)
 	}
 	return nil

net/netns/netns_linux_test.go

@@ -4,9 +4,51 @@
 package netns
 
 import (
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
 	"testing"
 )
 
+// verifies tailscaleBypassMark is in sync with wgengine.
+func TestBypassMarkInSync(t *testing.T) {
+	want := fmt.Sprintf("%q", fmt.Sprintf("0x%x", tailscaleBypassMark))
+	fset := token.NewFileSet()
+	f, err := parser.ParseFile(fset, "../../wgengine/router/router_linux.go", nil, 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, decl := range f.Decls {
+		gd, ok := decl.(*ast.GenDecl)
+		if !ok || gd.Tok != token.CONST {
+			continue
+		}
+		for _, spec := range gd.Specs {
+			vs, ok := spec.(*ast.ValueSpec)
+			if !ok {
+				continue
+			}
+			for i, ident := range vs.Names {
+				if ident.Name != "tailscaleBypassMark" {
+					continue
+				}
+				valExpr := vs.Values[i]
+				lit, ok := valExpr.(*ast.BasicLit)
+				if !ok {
+					t.Errorf("tailscaleBypassMark = %T, expected *ast.BasicLit", valExpr)
+				}
+				if lit.Value == want {
+					// Pass.
+					return
+				}
+				t.Fatalf("router_linux.go's tailscaleBypassMark = %s; not in sync with netns's %s", lit.Value, want)
+			}
+		}
+	}
+	t.Errorf("tailscaleBypassMark not found in router_linux.go")
+}
+
 func TestSocketMarkWorks(t *testing.T) {
 	_ = socketMarkWorks()
 	// we cannot actually assert whether the test runner has SO_MARK available

net/netutil/ip_forward.go

@@ -212,16 +212,9 @@ func ipForwardingEnabledLinux(p protocol, iface string) (bool, error) {
 		}
 		return false, err
 	}
-
-	val, err := strconv.ParseInt(string(bytes.TrimSpace(bs)), 10, 32)
+	on, err := strconv.ParseBool(string(bytes.TrimSpace(bs)))
 	if err != nil {
 		return false, fmt.Errorf("couldn't parse %s: %w", k, err)
 	}
-	// 0 = disabled, 1 = enabled, 2 = enabled (but uncommon)
-	// https://github.com/tailscale/tailscale/issues/8375
-	if val < 0 || val > 2 {
-		return false, fmt.Errorf("unexpected value %d for %s", val, k)
-	}
-	on := val == 1 || val == 2
 	return on, nil
 }

net/tcpinfo/tcpinfo.go

@@ -1,51 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-// Package tcpinfo provides platform-agnostic accessors to information about a
-// TCP connection (e.g. RTT, MSS, etc.).
-package tcpinfo
-
-import (
-	"errors"
-	"net"
-	"time"
-)
-
-var (
-	ErrNotTCP        = errors.New("tcpinfo: not a TCP conn")
-	ErrUnimplemented = errors.New("tcpinfo: unimplemented")
-)
-
-// RTT returns the RTT for the given net.Conn.
-//
-// If the net.Conn is not a *net.TCPConn and cannot be unwrapped into one, then
-// ErrNotTCP will be returned. If retrieving the RTT is not supported on the
-// current platform, ErrUnimplemented will be returned.
-func RTT(conn net.Conn) (time.Duration, error) {
-	tcpConn, err := unwrap(conn)
-	if err != nil {
-		return 0, err
-	}
-
-	return rttImpl(tcpConn)
-}
-
-// netConner is implemented by crypto/tls.Conn to unwrap into an underlying
-// net.Conn.
-type netConner interface {
-	NetConn() net.Conn
-}
-
-// unwrap attempts to unwrap a net.Conn into an underlying *net.TCPConn
-func unwrap(nc net.Conn) (*net.TCPConn, error) {
-	for {
-		switch v := nc.(type) {
-		case *net.TCPConn:
-			return v, nil
-		case netConner:
-			nc = v.NetConn()
-		default:
-			return nil, ErrNotTCP
-		}
-	}
-}

net/tcpinfo/tcpinfo_darwin.go

@@ -1,33 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-package tcpinfo
-
-import (
-	"net"
-	"time"
-
-	"golang.org/x/sys/unix"
-)
-
-func rttImpl(conn *net.TCPConn) (time.Duration, error) {
-	rawConn, err := conn.SyscallConn()
-	if err != nil {
-		return 0, err
-	}
-
-	var (
-		tcpInfo *unix.TCPConnectionInfo
-		sysErr  error
-	)
-	err = rawConn.Control(func(fd uintptr) {
-		tcpInfo, sysErr = unix.GetsockoptTCPConnectionInfo(int(fd), unix.IPPROTO_TCP, unix.TCP_CONNECTION_INFO)
-	})
-	if err != nil {
-		return 0, err
-	} else if sysErr != nil {
-		return 0, sysErr
-	}
-
-	return time.Duration(tcpInfo.Rttcur) * time.Millisecond, nil
-}

net/tcpinfo/tcpinfo_linux.go

@@ -1,33 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-package tcpinfo
-
-import (
-	"net"
-	"time"
-
-	"golang.org/x/sys/unix"
-)
-
-func rttImpl(conn *net.TCPConn) (time.Duration, error) {
-	rawConn, err := conn.SyscallConn()
-	if err != nil {
-		return 0, err
-	}
-
-	var (
-		tcpInfo *unix.TCPInfo
-		sysErr  error
-	)
-	err = rawConn.Control(func(fd uintptr) {
-		tcpInfo, sysErr = unix.GetsockoptTCPInfo(int(fd), unix.IPPROTO_TCP, unix.TCP_INFO)
-	})
-	if err != nil {
-		return 0, err
-	} else if sysErr != nil {
-		return 0, sysErr
-	}
-
-	return time.Duration(tcpInfo.Rtt) * time.Microsecond, nil
-}

net/tcpinfo/tcpinfo_other.go

@@ -1,15 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-//go:build !linux && !darwin
-
-package tcpinfo
-
-import (
-	"net"
-	"time"
-)
-
-func rttImpl(conn *net.TCPConn) (time.Duration, error) {
-	return 0, ErrUnimplemented
-}

net/tcpinfo/tcpinfo_test.go

@@ -1,64 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-package tcpinfo
-
-import (
-	"bytes"
-	"io"
-	"net"
-	"runtime"
-	"testing"
-)
-
-func TestRTT(t *testing.T) {
-	switch runtime.GOOS {
-	case "linux", "darwin":
-	default:
-		t.Skipf("not currently supported on %s", runtime.GOOS)
-	}
-
-	ln, err := net.Listen("tcp4", "localhost:0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer ln.Close()
-
-	go func() {
-		for {
-			c, err := ln.Accept()
-			if err != nil {
-				return
-			}
-			t.Cleanup(func() { c.Close() })
-
-			// Copy from the client to nowhere
-			go io.Copy(io.Discard, c)
-		}
-	}()
-
-	conn, err := net.Dial("tcp4", ln.Addr().String())
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// Write a bunch of data to the conn to force TCP session establishment
-	// and a few packets.
-	junkData := bytes.Repeat([]byte("hello world\n"), 1024*1024)
-	for i := 0; i < 10; i++ {
-		if _, err := conn.Write(junkData); err != nil {
-			t.Fatalf("error writing junk data [%d]: %v", i, err)
-		}
-	}
-
-	// Get the RTT now
-	rtt, err := RTT(conn)
-	if err != nil {
-		t.Fatalf("error getting RTT: %v", err)
-	}
-	if rtt == 0 {
-		t.Errorf("expected RTT > 0")
-	}
-
-	t.Logf("TCP rtt: %v", rtt)
-}

net/tstun/tun.go

@@ -1,7 +1,7 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
-//go:build !wasm
+//go:build !js
 
 // Package tun creates a tuntap device, working around OS-specific
 // quirks if necessary.

paths/paths_unix.go

@@ -1,7 +1,7 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
-//go:build !windows && !js && !wasip1
+//go:build !windows && !js
 
 package paths
 

prober/derp.go

@@ -188,9 +188,6 @@ func (d *derpProber) updateMap(ctx context.Context) error {
 			if existing, ok := d.nodes[n.HostName]; ok {
 				return fmt.Errorf("derpmap has duplicate nodes: %+v and %+v", existing, n)
 			}
-			// Allow the prober to monitor nodes marked as
-			// STUN only in the default map
-			n.STUNOnly = false
 			d.nodes[n.HostName] = n
 		}
 	}

release/dist/dist.go

@@ -184,17 +184,6 @@ func (b *Build) TmpDir() string {
 // binary. Builds are cached by path and env, so each build only happens once
 // per process execution.
 func (b *Build) BuildGoBinary(path string, env map[string]string) (string, error) {
-	return b.BuildGoBinaryWithTags(path, env, nil)
-}
-
-// BuildGoBinaryWithTags builds the Go binary at path and returns the
-// path to the binary. Builds are cached by path, env and tags, so
-// each build only happens once per process execution.
-//
-// The passed in tags override gocross's automatic selection of build
-// tags, so you will have to figure out and specify all the tags
-// relevant to your build.
-func (b *Build) BuildGoBinaryWithTags(path string, env map[string]string, tags []string) (string, error) {
 	err := b.Once("init-go", func() error {
 		log.Printf("Initializing Go toolchain")
 		// If the build is using a tool/go, it may need to download a toolchain
@@ -208,7 +197,7 @@ func (b *Build) BuildGoBinaryWithTags(path string, env map[string]string, tags [
 		return "", err
 	}
 
-	buildKey := []any{"go-build", path, env, tags}
+	buildKey := []any{"go-build", path, env}
 	return b.goBuilds.Do(buildKey, func() (string, error) {
 		b.goBuildLimit <- struct{}{}
 		defer func() { <-b.goBuildLimit }()
@@ -218,17 +207,9 @@ func (b *Build) BuildGoBinaryWithTags(path string, env map[string]string, tags [
 			envStrs = append(envStrs, k+"="+v)
 		}
 		sort.Strings(envStrs)
+		log.Printf("Building %s (with env %s)", path, strings.Join(envStrs, " "))
 		buildDir := b.TmpDir()
-		args := []string{"build", "-v", "-o", buildDir}
-		if len(tags) > 0 {
-			tagsStr := strings.Join(tags, ",")
-			log.Printf("Building %s (with env %s, tags %s)", path, strings.Join(envStrs, " "), tagsStr)
-			args = append(args, "-tags="+tagsStr)
-		} else {
-			log.Printf("Building %s (with env %s)", path, strings.Join(envStrs, " "))
-		}
-		args = append(args, path)
-		cmd := b.Command(b.Repo, b.Go, args...)
+		cmd := b.Command(b.Repo, b.Go, "build", "-v", "-o", buildDir, path)
 		for k, v := range env {
 			cmd.Cmd.Env = append(cmd.Cmd.Env, k+"="+v)
 		}

release/dist/synology/files/config

@@ -2,6 +2,7 @@
 	".url": {
 		"SYNO.SDS.Tailscale": {
 			"type": "url",
+			"version": "1.8.3",
 			"title": "Tailscale",
 			"icon": "PACKAGE_ICON_256.PNG",
 			"url": "webman/3rdparty/Tailscale/",

release/dist/synology/pkgs.go

@@ -176,7 +176,7 @@ func (m *synologyBuilds) buildInnerPackage(b *dist.Build, dsmVersion int, goenv
 			static(fmt.Sprintf("logrotate-dsm%d", dsmVersion), "conf/logrotate.conf", 0644),
 			dir("ui"),
 			static("PACKAGE_ICON_256.PNG", "ui/PACKAGE_ICON_256.PNG", 0644),
-			static("config", "ui/config", 0644),
+			static("config", "ui/config", 0644), // TODO: this has "1.8.3" hard-coded in it; why? what is it? bug?
 			static("index.cgi", "ui/index.cgi", 0755))
 		if err != nil {
 			return nil, err

shell.nix

@@ -16,4 +16,4 @@
 ) {
   src =  ./.;
 }).shellNix
-# nix-direnv cache busting line: sha256-fgCrmtJs1svFz0Xn7iwLNrbBNlcO6V0yqGPMY0+V1VQ=
+# nix-direnv cache busting line: sha256-l2uIma2oEdSN0zVo9BOFJF2gC3S60vXwTLVadv8yQPo=

ssh/tailssh/incubator.go

@@ -34,7 +34,6 @@ import (
 	"golang.org/x/exp/slices"
 	"golang.org/x/sys/unix"
 	"tailscale.com/cmd/tailscaled/childproc"
-	"tailscale.com/hostinfo"
 	"tailscale.com/tempfork/gliderlabs/ssh"
 	"tailscale.com/types/logger"
 	"tailscale.com/version/distro"
@@ -121,18 +120,10 @@ func (ss *sshSession) newIncubatorCommand() (cmd *exec.Cmd) {
 		if isShell {
 			incubatorArgs = append(incubatorArgs, "--shell")
 		}
-		// Only the macOS version of the login command supports executing a
-		// command, all other versions only support launching a shell
-		// without taking any arguments.
-		shouldUseLoginCmd := isShell || runtime.GOOS == "darwin"
-		if hostinfo.IsSELinuxEnforcing() {
-			// If we're running on a SELinux-enabled system, the login
-			// command will be unable to set the correct context for the
-			// shell. Fall back to using the incubator to launch the shell.
-			// See http://github.com/tailscale/tailscale/issues/4908.
-			shouldUseLoginCmd = false
-		}
-		if shouldUseLoginCmd {
+		if isShell || runtime.GOOS == "darwin" {
+			// Only the macOS version of the login command supports executing a
+			// command, all other versions only support launching a shell
+			// without taking any arguments.
 			if lp, err := exec.LookPath("login"); err == nil {
 				incubatorArgs = append(incubatorArgs, "--login-cmd="+lp)
 			}
@@ -476,10 +467,10 @@ func (ss *sshSession) launchProcess() error {
 	}
 	go resizeWindow(ptyDup /* arbitrary fd */, winCh)
 
-	ss.wrStdin = pty
-	ss.rdStdout = os.NewFile(uintptr(ptyDup), pty.Name())
-	ss.rdStderr = nil // not available for pty
-	ss.childPipes = []io.Closer{tty}
+	ss.tty = tty
+	ss.stdin = pty
+	ss.stdout = os.NewFile(uintptr(ptyDup), pty.Name())
+	ss.stderr = nil // not available for pty
 
 	return nil
 }
@@ -658,29 +649,40 @@ func (ss *sshSession) startWithPTY() (ptyFile, tty *os.File, err error) {
 
 // startWithStdPipes starts cmd with os.Pipe for Stdin, Stdout and Stderr.
 func (ss *sshSession) startWithStdPipes() (err error) {
-	var rdStdin, wrStdout, wrStderr io.ReadWriteCloser
+	var stdin io.WriteCloser
+	var stdout, stderr io.ReadCloser
 	defer func() {
 		if err != nil {
-			closeAll(rdStdin, ss.wrStdin, ss.rdStdout, wrStdout, ss.rdStderr, wrStderr)
+			for _, c := range []io.Closer{stdin, stdout, stderr} {
+				if c != nil {
+					c.Close()
+				}
+			}
 		}
 	}()
-	if ss.cmd == nil {
+	cmd := ss.cmd
+	if cmd == nil {
 		return errors.New("nil cmd")
 	}
-	if rdStdin, ss.wrStdin, err = os.Pipe(); err != nil {
+	stdin, err = cmd.StdinPipe()
+	if err != nil {
 		return err
 	}
-	if ss.rdStdout, wrStdout, err = os.Pipe(); err != nil {
+	stdout, err = cmd.StdoutPipe()
+	if err != nil {
 		return err
 	}
-	if ss.rdStderr, wrStderr, err = os.Pipe(); err != nil {
+	stderr, err = cmd.StderrPipe()
+	if err != nil {
 		return err
 	}
-	ss.cmd.Stdin = rdStdin
-	ss.cmd.Stdout = wrStdout
-	ss.cmd.Stderr = wrStderr
-	ss.childPipes = []io.Closer{rdStdin, wrStdout, wrStderr}
-	return ss.cmd.Start()
+	if err := cmd.Start(); err != nil {
+		return err
+	}
+	ss.stdin = stdin
+	ss.stdout = stdout
+	ss.stderr = stderr
+	return nil
 }
 
 func envForUser(u *userMeta) []string {

ssh/tailssh/tailssh.go

@@ -422,7 +422,6 @@ func (srv *server) newConn() (*conn, error) {
 	c := &conn{srv: srv}
 	now := srv.now()
 	c.connID = fmt.Sprintf("ssh-conn-%s-%02x", now.UTC().Format("20060102T150405"), randBytes(5))
-	fwdHandler := &ssh.ForwardedTCPHandler{}
 	c.Server = &ssh.Server{
 		Version:              "Tailscale",
 		ServerConfigCallback: c.ServerConfig,
@@ -431,9 +430,8 @@ func (srv *server) newConn() (*conn, error) {
 		PublicKeyHandler:    c.PublicKeyHandler,
 		PasswordHandler:     c.fakePasswordHandler,
 
-		Handler:                       c.handleSessionPostSSHAuth,
-		LocalPortForwardingCallback:   c.mayForwardLocalPortTo,
-		ReversePortForwardingCallback: c.mayReversePortForwardTo,
+		Handler:                     c.handleSessionPostSSHAuth,
+		LocalPortForwardingCallback: c.mayForwardLocalPortTo,
 		SubsystemHandlers: map[string]ssh.SubsystemHandler{
 			"sftp": c.handleSessionPostSSHAuth,
 		},
@@ -443,10 +441,7 @@ func (srv *server) newConn() (*conn, error) {
 		ChannelHandlers: map[string]ssh.ChannelHandler{
 			"direct-tcpip": ssh.DirectTCPIPHandler,
 		},
-		RequestHandlers: map[string]ssh.RequestHandler{
-			"tcpip-forward":        fwdHandler.HandleSSHRequest,
-			"cancel-tcpip-forward": fwdHandler.HandleSSHRequest,
-		},
+		RequestHandlers: map[string]ssh.RequestHandler{},
 	}
 	ss := c.Server
 	for k, v := range ssh.DefaultRequestHandlers {
@@ -468,17 +463,6 @@ func (srv *server) newConn() (*conn, error) {
 	return c, nil
 }
 
-// mayReversePortPortForwardTo reports whether the ctx should be allowed to port forward
-// to the specified host and port.
-// TODO(bradfitz/maisem): should we have more checks on host/port?
-func (c *conn) mayReversePortForwardTo(ctx ssh.Context, destinationHost string, destinationPort uint32) bool {
-	if c.finalAction != nil && c.finalAction.AllowRemotePortForwarding {
-		metricRemotePortForward.Add(1)
-		return true
-	}
-	return false
-}
-
 // mayForwardLocalPortTo reports whether the ctx should be allowed to port forward
 // to the specified host and port.
 // TODO(bradfitz/maisem): should we have more checks on host/port?
@@ -823,16 +807,12 @@ type sshSession struct {
 	agentListener net.Listener // non-nil if agent-forwarding requested+allowed
 
 	// initialized by launchProcess:
-	cmd      *exec.Cmd
-	wrStdin  io.WriteCloser
-	rdStdout io.ReadCloser
-	rdStderr io.ReadCloser // rdStderr is nil for pty sessions
-	ptyReq   *ssh.Pty      // non-nil for pty sessions
-
-	// childPipes is a list of pipes that need to be closed when the process exits.
-	// For pty sessions, this is the tty fd.
-	// For non-pty sessions, this is the stdin, stdout, stderr fds.
-	childPipes []io.Closer
+	cmd    *exec.Cmd
+	stdin  io.WriteCloser
+	stdout io.ReadCloser
+	stderr io.Reader // nil for pty sessions
+	ptyReq *ssh.Pty  // non-nil for pty sessions
+	tty    *os.File  // non-nil for pty sessions, must be closed after process exits
 
 	// We use this sync.Once to ensure that we only terminate the process once,
 	// either it exits itself or is terminated
@@ -1111,22 +1091,21 @@ func (ss *sshSession) run() {
 
 	var processDone atomic.Bool
 	go func() {
-		defer ss.wrStdin.Close()
-		if _, err := io.Copy(rec.writer("i", ss.wrStdin), ss); err != nil {
+		defer ss.stdin.Close()
+		if _, err := io.Copy(rec.writer("i", ss.stdin), ss); err != nil {
 			logf("stdin copy: %v", err)
 			ss.cancelCtx(err)
 		}
 	}()
-	outputDone := make(chan struct{})
 	var openOutputStreams atomic.Int32
-	if ss.rdStderr != nil {
+	if ss.stderr != nil {
 		openOutputStreams.Store(2)
 	} else {
 		openOutputStreams.Store(1)
 	}
 	go func() {
-		defer ss.rdStdout.Close()
-		_, err := io.Copy(rec.writer("o", ss), ss.rdStdout)
+		defer ss.stdout.Close()
+		_, err := io.Copy(rec.writer("o", ss), ss.stdout)
 		if err != nil && !errors.Is(err, io.EOF) {
 			isErrBecauseProcessExited := processDone.Load() && errors.Is(err, syscall.EIO)
 			if !isErrBecauseProcessExited {
@@ -1136,41 +1115,32 @@ func (ss *sshSession) run() {
 		}
 		if openOutputStreams.Add(-1) == 0 {
 			ss.CloseWrite()
-			close(outputDone)
 		}
 	}()
-	// rdStderr is nil for ptys.
-	if ss.rdStderr != nil {
+	// stderr is nil for ptys.
+	if ss.stderr != nil {
 		go func() {
-			defer ss.rdStderr.Close()
-			_, err := io.Copy(ss.Stderr(), ss.rdStderr)
+			_, err := io.Copy(ss.Stderr(), ss.stderr)
 			if err != nil {
 				logf("stderr copy: %v", err)
 			}
 			if openOutputStreams.Add(-1) == 0 {
 				ss.CloseWrite()
-				close(outputDone)
 			}
 		}()
 	}
 
+	if ss.tty != nil {
+		// If running a tty session, close the tty when the session is done.
+		defer ss.tty.Close()
+	}
 	err = ss.cmd.Wait()
 	processDone.Store(true)
-
 	// This will either make the SSH Termination goroutine be a no-op,
 	// or itself will be a no-op because the process was killed by the
 	// aforementioned goroutine.
 	ss.exitOnce.Do(func() {})
 
-	// Close the process-side of all pipes to signal the asynchronous
-	// io.Copy routines reading/writing from the pipes to terminate.
-	// Block for the io.Copy to finish before calling ss.Exit below.
-	closeAll(ss.childPipes...)
-	select {
-	case <-outputDone:
-	case <-ss.ctx.Done():
-	}
-
 	if err == nil {
 		ss.logf("Session complete")
 		ss.Exit(0)
@@ -1890,7 +1860,6 @@ var (
 	metricPolicyChangeKick     = clientmetric.NewCounter("ssh_policy_change_kick")
 	metricSFTP                 = clientmetric.NewCounter("ssh_sftp_requests")
 	metricLocalPortForward     = clientmetric.NewCounter("ssh_local_port_forward_requests")
-	metricRemotePortForward    = clientmetric.NewCounter("ssh_remote_port_forward_requests")
 )
 
 // userVisibleError is a wrapper around an error that implements
@@ -1908,11 +1877,3 @@ type SSHTerminationError interface {
 	error
 	SSHTerminationMessage() string
 }
-
-func closeAll(cs ...io.Closer) {
-	for _, c := range cs {
-		if c != nil {
-			c.Close()
-		}
-	}
-}

ssh/tailssh/tailssh_test.go

@@ -25,7 +25,6 @@ import (
 	"os/user"
 	"reflect"
 	"runtime"
-	"strconv"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -948,19 +947,6 @@ func TestSSH(t *testing.T) {
 		// "foo\n" and "bar\n", not "\n" and "bar\n".
 	})
 
-	t.Run("large_file", func(t *testing.T) {
-		const wantSize = 1e6
-		var outBuf bytes.Buffer
-		cmd := execSSH("head", "-c", strconv.Itoa(wantSize), "/dev/zero")
-		cmd.Stdout = &outBuf
-		if err := cmd.Run(); err != nil {
-			t.Fatal(err)
-		}
-		if gotSize := outBuf.Len(); gotSize != wantSize {
-			t.Fatalf("got %d, want %d", gotSize, int(wantSize))
-		}
-	})
-
 	t.Run("stdin", func(t *testing.T) {
 		if cibuild.On() {
 			t.Skip("Skipping for now; see https://github.com/tailscale/tailscale/issues/4051")

syncs/shardedmap.go

@@ -1,138 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-package syncs
-
-import (
-	"sync"
-
-	"golang.org/x/sys/cpu"
-)
-
-// ShardedMap is a synchronized map[K]V, internally sharded by a user-defined
-// K-sharding function.
-//
-// The zero value is not safe for use; use NewShardedMap.
-type ShardedMap[K comparable, V any] struct {
-	shardFunc func(K) int
-	shards    []mapShard[K, V]
-}
-
-type mapShard[K comparable, V any] struct {
-	mu sync.Mutex
-	m  map[K]V
-	_  cpu.CacheLinePad // avoid false sharing of neighboring shards' mutexes
-}
-
-// NewShardedMap returns a new ShardedMap with the given number of shards and
-// sharding function.
-//
-// The shard func must return a integer in the range [0, shards) purely
-// deterministically based on the provided K.
-func NewShardedMap[K comparable, V any](shards int, shard func(K) int) *ShardedMap[K, V] {
-	m := &ShardedMap[K, V]{
-		shardFunc: shard,
-		shards:    make([]mapShard[K, V], shards),
-	}
-	for i := range m.shards {
-		m.shards[i].m = make(map[K]V)
-	}
-	return m
-}
-
-func (m *ShardedMap[K, V]) shard(key K) *mapShard[K, V] {
-	return &m.shards[m.shardFunc(key)]
-}
-
-// GetOk returns m[key] and whether it was present.
-func (m *ShardedMap[K, V]) GetOk(key K) (value V, ok bool) {
-	shard := m.shard(key)
-	shard.mu.Lock()
-	defer shard.mu.Unlock()
-	value, ok = shard.m[key]
-	return
-}
-
-// Get returns m[key] or the zero value of V if key is not present.
-func (m *ShardedMap[K, V]) Get(key K) (value V) {
-	value, _ = m.GetOk(key)
-	return
-}
-
-// Mutate atomically mutates m[k] by calling mutator.
-//
-// The mutator function is called with the old value (or its zero value) and
-// whether it existed in the map and it returns the new value and whether it
-// should be set in the map (true) or deleted from the map (false).
-//
-// It returns the change in size of the map as a result of the mutation, one of
-// -1 (delete), 0 (change), or 1 (addition).
-func (m *ShardedMap[K, V]) Mutate(key K, mutator func(oldValue V, oldValueExisted bool) (newValue V, keep bool)) (sizeDelta int) {
-	shard := m.shard(key)
-	shard.mu.Lock()
-	defer shard.mu.Unlock()
-	oldV, oldOK := shard.m[key]
-	newV, newOK := mutator(oldV, oldOK)
-	if newOK {
-		shard.m[key] = newV
-		if oldOK {
-			return 0
-		}
-		return 1
-	}
-	delete(shard.m, key)
-	if oldOK {
-		return -1
-	}
-	return 0
-}
-
-// Set sets m[key] = value.
-//
-// present in m).
-func (m *ShardedMap[K, V]) Set(key K, value V) (grew bool) {
-	shard := m.shard(key)
-	shard.mu.Lock()
-	defer shard.mu.Unlock()
-	s0 := len(shard.m)
-	shard.m[key] = value
-	return len(shard.m) > s0
-}
-
-// Delete removes key from m.
-//
-// It reports whether the map size shrunk (that is, whether key was present in
-// the map).
-func (m *ShardedMap[K, V]) Delete(key K) (shrunk bool) {
-	shard := m.shard(key)
-	shard.mu.Lock()
-	defer shard.mu.Unlock()
-	s0 := len(shard.m)
-	delete(shard.m, key)
-	return len(shard.m) < s0
-}
-
-// Contains reports whether m contains key.
-func (m *ShardedMap[K, V]) Contains(key K) bool {
-	shard := m.shard(key)
-	shard.mu.Lock()
-	defer shard.mu.Unlock()
-	_, ok := shard.m[key]
-	return ok
-}
-
-// Len returns the number of elements in m.
-//
-// It does so by locking shards one at a time, so it's not particularly cheap,
-// nor does it give a consistent snapshot of the map. It's mostly intended for
-// metrics or testing.
-func (m *ShardedMap[K, V]) Len() int {
-	n := 0
-	for i := range m.shards {
-		shard := &m.shards[i]
-		shard.mu.Lock()
-		n += len(shard.m)
-		shard.mu.Unlock()
-	}
-	return n
-}

syncs/shardedmap_test.go

@@ -1,81 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-package syncs
-
-import "testing"
-
-func TestShardedMap(t *testing.T) {
-	m := NewShardedMap[int, string](16, func(i int) int { return i % 16 })
-
-	if m.Contains(1) {
-		t.Errorf("got contains; want !contains")
-	}
-	if !m.Set(1, "one") {
-		t.Errorf("got !set; want set")
-	}
-	if m.Set(1, "one") {
-		t.Errorf("got set; want !set")
-	}
-	if !m.Contains(1) {
-		t.Errorf("got !contains; want contains")
-	}
-	if g, w := m.Get(1), "one"; g != w {
-		t.Errorf("got %q; want %q", g, w)
-	}
-	if _, ok := m.GetOk(1); !ok {
-		t.Errorf("got ok; want !ok")
-	}
-	if _, ok := m.GetOk(2); ok {
-		t.Errorf("got ok; want !ok")
-	}
-	if g, w := m.Len(), 1; g != w {
-		t.Errorf("got Len %v; want %v", g, w)
-	}
-	if m.Delete(2) {
-		t.Errorf("got deleted; want !deleted")
-	}
-	if !m.Delete(1) {
-		t.Errorf("got !deleted; want deleted")
-	}
-	if g, w := m.Len(), 0; g != w {
-		t.Errorf("got Len %v; want %v", g, w)
-	}
-
-	// Mutation adding an entry.
-	if v := m.Mutate(1, func(was string, ok bool) (string, bool) {
-		if ok {
-			t.Fatal("was okay")
-		}
-		return "ONE", true
-	}); v != 1 {
-		t.Errorf("Mutate = %v; want 1", v)
-	}
-	if g, w := m.Get(1), "ONE"; g != w {
-		t.Errorf("got %q; want %q", g, w)
-	}
-	// Mutation changing an entry.
-	if v := m.Mutate(1, func(was string, ok bool) (string, bool) {
-		if !ok {
-			t.Fatal("wasn't okay")
-		}
-		return was + "-" + was, true
-	}); v != 0 {
-		t.Errorf("Mutate = %v; want 0", v)
-	}
-	if g, w := m.Get(1), "ONE-ONE"; g != w {
-		t.Errorf("got %q; want %q", g, w)
-	}
-	// Mutation removing an entry.
-	if v := m.Mutate(1, func(was string, ok bool) (string, bool) {
-		if !ok {
-			t.Fatal("wasn't okay")
-		}
-		return "", false
-	}); v != -1 {
-		t.Errorf("Mutate = %v; want -1", v)
-	}
-	if g, w := m.Get(1), ""; g != w {
-		t.Errorf("got %q; want %q", g, w)
-	}
-}

tailcfg/tailcfg.go

@@ -3,7 +3,7 @@
 
 package tailcfg
 
-//go:generate go run tailscale.com/cmd/viewer --type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode,SSHRule,SSHAction,SSHPrincipal,ControlDialPlan,Location --clonefunc
+//go:generate go run tailscale.com/cmd/viewer --type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode,SSHRule,SSHAction,SSHPrincipal,ControlDialPlan --clonefunc
 
 import (
 	"bytes"
@@ -99,8 +99,7 @@ type CapabilityVersion int
 //   - 60: 2023-04-06: Client understands IsWireGuardOnly
 //   - 61: 2023-04-18: Client understand SSHAction.SSHRecorderFailureAction
 //   - 62: 2023-05-05: Client can notify control over noise for SSHEventNotificationRequest recording failure events
-//   - 63: 2023-06-08: Client understands SSHAction.AllowRemotePortForwarding.
-const CurrentCapabilityVersion CapabilityVersion = 63
+const CurrentCapabilityVersion CapabilityVersion = 62
 
 type StableID string
 
@@ -242,6 +241,8 @@ type Node struct {
 	// current node doesn't have permission to know.
 	Online *bool `json:",omitempty"`
 
+	KeepAlive bool `json:",omitempty"` // open and keep open a connection to this peer
+
 	MachineAuthorized bool `json:",omitempty"` // TODO(crawshaw): replace with MachineStatus
 
 	// Capabilities are capabilities that the node has.
@@ -529,31 +530,6 @@ type Service struct {
 	// TODO(apenwarr): add "tags" here for each service?
 }
 
-// Location represents geographical location data about a
-// Tailscale host. Location is optional and only set if
-// explicitly declared by a node.
-type Location struct {
-	Country     string `json:",omitempty"` // User friendly country name, with proper capitalization ("Canada")
-	CountryCode string `json:",omitempty"` // ISO 3166-1 alpha-2 in upper case ("CA")
-	City        string `json:",omitempty"` // User friendly city name, with proper capitalization ("Squamish")
-
-	// CityCode is a short code representing the city in upper case.
-	// CityCode is used to disambiguate a city from another location
-	// with the same city name. It uniquely identifies a particular
-	// geographical location, within the tailnet.
-	// IATA, ICAO or ISO 3166-2 codes are recommended ("YSE")
-	CityCode string `json:",omitempty"`
-
-	// Priority determines the order of use of an exit node when a
-	// location based preference matches more than one exit node,
-	// the node with the highest priority wins. Nodes of equal
-	// probability may be selected arbitrarily.
-	//
-	// A value of 0 means the exit node does not have a priority
-	// preference. A negative int is not allowed.
-	Priority int `json:",omitempty"`
-}
-
 // Hostinfo contains a summary of a Tailscale host.
 //
 // Because it contains pointers (slices), this type should not be used
@@ -608,11 +584,6 @@ type Hostinfo struct {
 	Userspace       opt.Bool       `json:",omitempty"` // if the client is running in userspace (netstack) mode
 	UserspaceRouter opt.Bool       `json:",omitempty"` // if the client's subnet router is running in userspace (netstack) mode
 
-	// Location represents geographical location data about a
-	// Tailscale host. Location is optional and only set if
-	// explicitly declared by a node.
-	Location *Location `json:",omitempty"`
-
 	// NOTE: any new fields containing pointers in this type
 	//       require changes to Hostinfo.Equal.
 }
@@ -1282,7 +1253,7 @@ type DNSConfig struct {
 	// match.
 	//
 	// Matches are case insensitive.
-	ExitNodeFilteredSet []string `json:",omitempty"`
+	ExitNodeFilteredSet []string
 }
 
 // DNSRecord is an extra DNS record to add to MagicDNS.
@@ -2077,10 +2048,6 @@ type SSHAction struct {
 	// to use local port forwarding if requested.
 	AllowLocalPortForwarding bool `json:"allowLocalPortForwarding,omitempty"`
 
-	// AllowRemotePortForwarding, if true, allows accepted connections
-	// to use remote port forwarding if requested.
-	AllowRemotePortForwarding bool `json:"allowRemotePortForwarding,omitempty"`
-
 	// Recorders defines the destinations of the SSH session recorders.
 	// The recording will be uploaded to http://addr:port/record.
 	Recorders []netip.AddrPort `json:"recorders,omitempty"`

tailcfg/tailcfg_clone.go

@@ -93,6 +93,7 @@ var _NodeCloneNeedsRegeneration = Node(struct {
 	PrimaryRoutes                 []netip.Prefix
 	LastSeen                      *time.Time
 	Online                        *bool
+	KeepAlive                     bool
 	MachineAuthorized             bool
 	Capabilities                  []string
 	UnsignedPeerAPIOnly           bool
@@ -118,10 +119,6 @@ func (src *Hostinfo) Clone() *Hostinfo {
 	dst.Services = append(src.Services[:0:0], src.Services...)
 	dst.NetInfo = src.NetInfo.Clone()
 	dst.SSH_HostKeys = append(src.SSH_HostKeys[:0:0], src.SSH_HostKeys...)
-	if dst.Location != nil {
-		dst.Location = new(Location)
-		*dst.Location = *src.Location
-	}
 	return dst
 }
 
@@ -160,7 +157,6 @@ var _HostinfoCloneNeedsRegeneration = Hostinfo(struct {
 	Cloud           string
 	Userspace       opt.Bool
 	UserspaceRouter opt.Bool
-	Location        *Location
 }{})
 
 // Clone makes a deep copy of NetInfo.
@@ -412,16 +408,15 @@ func (src *SSHAction) Clone() *SSHAction {
 
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _SSHActionCloneNeedsRegeneration = SSHAction(struct {
-	Message                   string
-	Reject                    bool
-	Accept                    bool
-	SessionDuration           time.Duration
-	AllowAgentForwarding      bool
-	HoldAndDelegate           string
-	AllowLocalPortForwarding  bool
-	AllowRemotePortForwarding bool
-	Recorders                 []netip.AddrPort
-	OnRecordingFailure        *SSHRecorderFailureAction
+	Message                  string
+	Reject                   bool
+	Accept                   bool
+	SessionDuration          time.Duration
+	AllowAgentForwarding     bool
+	HoldAndDelegate          string
+	AllowLocalPortForwarding bool
+	Recorders                []netip.AddrPort
+	OnRecordingFailure       *SSHRecorderFailureAction
 }{})
 
 // Clone makes a deep copy of SSHPrincipal.
@@ -462,29 +457,9 @@ var _ControlDialPlanCloneNeedsRegeneration = ControlDialPlan(struct {
 	Candidates []ControlIPCandidate
 }{})
 
-// Clone makes a deep copy of Location.
-// The result aliases no memory with the original.
-func (src *Location) Clone() *Location {
-	if src == nil {
-		return nil
-	}
-	dst := new(Location)
-	*dst = *src
-	return dst
-}
-
-// A compilation failure here means this code must be regenerated, with the command at the top of this file.
-var _LocationCloneNeedsRegeneration = Location(struct {
-	Country     string
-	CountryCode string
-	City        string
-	CityCode    string
-	Priority    int
-}{})
-
 // Clone duplicates src into dst and reports whether it succeeded.
 // To succeed, <src, dst> must be of types <*T, *T> or <*T, **T>,
-// where T is one of User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode,SSHRule,SSHAction,SSHPrincipal,ControlDialPlan,Location.
+// where T is one of User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode,SSHRule,SSHAction,SSHPrincipal,ControlDialPlan.
 func Clone(dst, src any) bool {
 	switch src := src.(type) {
 	case *User:
@@ -613,15 +588,6 @@ func Clone(dst, src any) bool {
 			*dst = src.Clone()
 			return true
 		}
-	case *Location:
-		switch dst := dst.(type) {
-		case *Location:
-			*dst = *src.Clone()
-			return true
-		case **Location:
-			*dst = src.Clone()
-			return true
-		}
 	}
 	return false
 }

tailcfg/tailcfg_test.go

@@ -65,7 +65,6 @@ func TestHostinfoEqual(t *testing.T) {
 		"Cloud",
 		"Userspace",
 		"UserspaceRouter",
-		"Location",
 	}
 	if have := fieldsOf(reflect.TypeOf(Hostinfo{})); !reflect.DeepEqual(have, hiHandles) {
 		t.Errorf("Hostinfo.Equal check might be out of sync\nfields: %q\nhandled: %q\n",
@@ -347,7 +346,7 @@ func TestNodeEqual(t *testing.T) {
 		"Key", "KeyExpiry", "KeySignature", "Machine", "DiscoKey",
 		"Addresses", "AllowedIPs", "Endpoints", "DERP", "Hostinfo",
 		"Created", "Cap", "Tags", "PrimaryRoutes",
-		"LastSeen", "Online", "MachineAuthorized",
+		"LastSeen", "Online", "KeepAlive", "MachineAuthorized",
 		"Capabilities",
 		"UnsignedPeerAPIOnly",
 		"ComputedName", "computedHostIfDifferent", "ComputedNameWithHost",

tailcfg/tailcfg_view.go

@@ -20,7 +20,7 @@ import (
 	"tailscale.com/types/views"
 )
 
-//go:generate go run tailscale.com/cmd/cloner  -clonefunc=true -type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode,SSHRule,SSHAction,SSHPrincipal,ControlDialPlan,Location
+//go:generate go run tailscale.com/cmd/cloner  -clonefunc=true -type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode,SSHRule,SSHAction,SSHPrincipal,ControlDialPlan
 
 // View returns a readonly view of User.
 func (p *User) View() UserView {
@@ -168,6 +168,7 @@ func (v NodeView) Online() *bool {
 	return &x
 }
 
+func (v NodeView) KeepAlive() bool                   { return v.ж.KeepAlive }
 func (v NodeView) MachineAuthorized() bool           { return v.ж.MachineAuthorized }
 func (v NodeView) Capabilities() views.Slice[string] { return views.SliceOf(v.ж.Capabilities) }
 func (v NodeView) UnsignedPeerAPIOnly() bool         { return v.ж.UnsignedPeerAPIOnly }
@@ -209,6 +210,7 @@ var _NodeViewNeedsRegeneration = Node(struct {
 	PrimaryRoutes                 []netip.Prefix
 	LastSeen                      *time.Time
 	Online                        *bool
+	KeepAlive                     bool
 	MachineAuthorized             bool
 	Capabilities                  []string
 	UnsignedPeerAPIOnly           bool
@@ -301,15 +303,7 @@ func (v HostinfoView) SSH_HostKeys() views.Slice[string] { return views.SliceOf(
 func (v HostinfoView) Cloud() string                     { return v.ж.Cloud }
 func (v HostinfoView) Userspace() opt.Bool               { return v.ж.Userspace }
 func (v HostinfoView) UserspaceRouter() opt.Bool         { return v.ж.UserspaceRouter }
-func (v HostinfoView) Location() *Location {
-	if v.ж.Location == nil {
-		return nil
-	}
-	x := *v.ж.Location
-	return &x
-}
-
-func (v HostinfoView) Equal(v2 HostinfoView) bool { return v.ж.Equal(v2.ж) }
+func (v HostinfoView) Equal(v2 HostinfoView) bool        { return v.ж.Equal(v2.ж) }
 
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _HostinfoViewNeedsRegeneration = Hostinfo(struct {
@@ -346,7 +340,6 @@ var _HostinfoViewNeedsRegeneration = Hostinfo(struct {
 	Cloud           string
 	Userspace       opt.Bool
 	UserspaceRouter opt.Bool
-	Location        *Location
 }{})
 
 // View returns a readonly view of NetInfo.
@@ -947,7 +940,6 @@ func (v SSHActionView) SessionDuration() time.Duration         { return v.ж.Ses
 func (v SSHActionView) AllowAgentForwarding() bool             { return v.ж.AllowAgentForwarding }
 func (v SSHActionView) HoldAndDelegate() string                { return v.ж.HoldAndDelegate }
 func (v SSHActionView) AllowLocalPortForwarding() bool         { return v.ж.AllowLocalPortForwarding }
-func (v SSHActionView) AllowRemotePortForwarding() bool        { return v.ж.AllowRemotePortForwarding }
 func (v SSHActionView) Recorders() views.Slice[netip.AddrPort] { return views.SliceOf(v.ж.Recorders) }
 func (v SSHActionView) OnRecordingFailure() *SSHRecorderFailureAction {
 	if v.ж.OnRecordingFailure == nil {
@@ -959,16 +951,15 @@ func (v SSHActionView) OnRecordingFailure() *SSHRecorderFailureAction {
 
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _SSHActionViewNeedsRegeneration = SSHAction(struct {
-	Message                   string
-	Reject                    bool
-	Accept                    bool
-	SessionDuration           time.Duration
-	AllowAgentForwarding      bool
-	HoldAndDelegate           string
-	AllowLocalPortForwarding  bool
-	AllowRemotePortForwarding bool
-	Recorders                 []netip.AddrPort
-	OnRecordingFailure        *SSHRecorderFailureAction
+	Message                  string
+	Reject                   bool
+	Accept                   bool
+	SessionDuration          time.Duration
+	AllowAgentForwarding     bool
+	HoldAndDelegate          string
+	AllowLocalPortForwarding bool
+	Recorders                []netip.AddrPort
+	OnRecordingFailure       *SSHRecorderFailureAction
 }{})
 
 // View returns a readonly view of SSHPrincipal.
@@ -1084,63 +1075,3 @@ func (v ControlDialPlanView) Candidates() views.Slice[ControlIPCandidate] {
 var _ControlDialPlanViewNeedsRegeneration = ControlDialPlan(struct {
 	Candidates []ControlIPCandidate
 }{})
-
-// View returns a readonly view of Location.
-func (p *Location) View() LocationView {
-	return LocationView{ж: p}
-}
-
-// LocationView provides a read-only view over Location.
-//
-// Its methods should only be called if `Valid()` returns true.
-type LocationView struct {
-	// ж is the underlying mutable value, named with a hard-to-type
-	// character that looks pointy like a pointer.
-	// It is named distinctively to make you think of how dangerous it is to escape
-	// to callers. You must not let callers be able to mutate it.
-	ж *Location
-}
-
-// Valid reports whether underlying value is non-nil.
-func (v LocationView) Valid() bool { return v.ж != nil }
-
-// AsStruct returns a clone of the underlying value which aliases no memory with
-// the original.
-func (v LocationView) AsStruct() *Location {
-	if v.ж == nil {
-		return nil
-	}
-	return v.ж.Clone()
-}
-
-func (v LocationView) MarshalJSON() ([]byte, error) { return json.Marshal(v.ж) }
-
-func (v *LocationView) UnmarshalJSON(b []byte) error {
-	if v.ж != nil {
-		return errors.New("already initialized")
-	}
-	if len(b) == 0 {
-		return nil
-	}
-	var x Location
-	if err := json.Unmarshal(b, &x); err != nil {
-		return err
-	}
-	v.ж = &x
-	return nil
-}
-
-func (v LocationView) Country() string     { return v.ж.Country }
-func (v LocationView) CountryCode() string { return v.ж.CountryCode }
-func (v LocationView) City() string        { return v.ж.City }
-func (v LocationView) CityCode() string    { return v.ж.CityCode }
-func (v LocationView) Priority() int       { return v.ж.Priority }
-
-// A compilation failure here means this code must be regenerated, with the command at the top of this file.
-var _LocationViewNeedsRegeneration = Location(struct {
-	Country     string
-	CountryCode string
-	City        string
-	CityCode    string
-	Priority    int
-}{})

tempfork/heap/heap.go

@@ -1,121 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package heap provides heap operations for any type that implements
-// heap.Interface. A heap is a tree with the property that each node is the
-// minimum-valued node in its subtree.
-//
-// The minimum element in the tree is the root, at index 0.
-//
-// A heap is a common way to implement a priority queue. To build a priority
-// queue, implement the Heap interface with the (negative) priority as the
-// ordering for the Less method, so Push adds items while Pop removes the
-// highest-priority item from the queue. The Examples include such an
-// implementation; the file example_pq_test.go has the complete source.
-//
-// This package is a copy of the Go standard library's
-// container/heap, but using generics.
-package heap
-
-import "sort"
-
-// The Interface type describes the requirements
-// for a type using the routines in this package.
-// Any type that implements it may be used as a
-// min-heap with the following invariants (established after
-// Init has been called or if the data is empty or sorted):
-//
-//	!h.Less(j, i) for 0 <= i < h.Len() and 2*i+1 <= j <= 2*i+2 and j < h.Len()
-//
-// Note that Push and Pop in this interface are for package heap's
-// implementation to call. To add and remove things from the heap,
-// use heap.Push and heap.Pop.
-type Interface[V any] interface {
-	sort.Interface
-	Push(x V) // add x as element Len()
-	Pop() V   // remove and return element Len() - 1.
-}
-
-// Init establishes the heap invariants required by the other routines in this package.
-// Init is idempotent with respect to the heap invariants
-// and may be called whenever the heap invariants may have been invalidated.
-// The complexity is O(n) where n = h.Len().
-func Init[V any](h Interface[V]) {
-	// heapify
-	n := h.Len()
-	for i := n/2 - 1; i >= 0; i-- {
-		down(h, i, n)
-	}
-}
-
-// Push pushes the element x onto the heap.
-// The complexity is O(log n) where n = h.Len().
-func Push[V any](h Interface[V], x V) {
-	h.Push(x)
-	up(h, h.Len()-1)
-}
-
-// Pop removes and returns the minimum element (according to Less) from the heap.
-// The complexity is O(log n) where n = h.Len().
-// Pop is equivalent to Remove(h, 0).
-func Pop[V any](h Interface[V]) V {
-	n := h.Len() - 1
-	h.Swap(0, n)
-	down(h, 0, n)
-	return h.Pop()
-}
-
-// Remove removes and returns the element at index i from the heap.
-// The complexity is O(log n) where n = h.Len().
-func Remove[V any](h Interface[V], i int) V {
-	n := h.Len() - 1
-	if n != i {
-		h.Swap(i, n)
-		if !down(h, i, n) {
-			up(h, i)
-		}
-	}
-	return h.Pop()
-}
-
-// Fix re-establishes the heap ordering after the element at index i has changed its value.
-// Changing the value of the element at index i and then calling Fix is equivalent to,
-// but less expensive than, calling Remove(h, i) followed by a Push of the new value.
-// The complexity is O(log n) where n = h.Len().
-func Fix[V any](h Interface[V], i int) {
-	if !down(h, i, h.Len()) {
-		up(h, i)
-	}
-}
-
-func up[V any](h Interface[V], j int) {
-	for {
-		i := (j - 1) / 2 // parent
-		if i == j || !h.Less(j, i) {
-			break
-		}
-		h.Swap(i, j)
-		j = i
-	}
-}
-
-func down[V any](h Interface[V], i0, n int) bool {
-	i := i0
-	for {
-		j1 := 2*i + 1
-		if j1 >= n || j1 < 0 { // j1 < 0 after int overflow
-			break
-		}
-		j := j1 // left child
-		if j2 := j1 + 1; j2 < n && h.Less(j2, j1) {
-			j = j2 // = 2*i + 2  // right child
-		}
-		if !h.Less(j, i) {
-			break
-		}
-		h.Swap(i, j)
-		i = j
-	}
-	return i > i0
-}

tempfork/heap/heap_test.go

@@ -1,216 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package heap
-
-import (
-	"math/rand"
-	"testing"
-
-	"golang.org/x/exp/constraints"
-)
-
-type myHeap[T constraints.Ordered] []T
-
-func (h *myHeap[T]) Less(i, j int) bool {
-	return (*h)[i] < (*h)[j]
-}
-
-func (h *myHeap[T]) Swap(i, j int) {
-	(*h)[i], (*h)[j] = (*h)[j], (*h)[i]
-}
-
-func (h *myHeap[T]) Len() int {
-	return len(*h)
-}
-
-func (h *myHeap[T]) Pop() (v T) {
-	*h, v = (*h)[:h.Len()-1], (*h)[h.Len()-1]
-	return
-}
-
-func (h *myHeap[T]) Push(v T) {
-	*h = append(*h, v)
-}
-
-func (h myHeap[T]) verify(t *testing.T, i int) {
-	t.Helper()
-	n := h.Len()
-	j1 := 2*i + 1
-	j2 := 2*i + 2
-	if j1 < n {
-		if h.Less(j1, i) {
-			t.Errorf("heap invariant invalidated [%d] = %v > [%d] = %v", i, h[i], j1, h[j1])
-			return
-		}
-		h.verify(t, j1)
-	}
-	if j2 < n {
-		if h.Less(j2, i) {
-			t.Errorf("heap invariant invalidated [%d] = %v > [%d] = %v", i, h[i], j1, h[j2])
-			return
-		}
-		h.verify(t, j2)
-	}
-}
-
-func TestInit0(t *testing.T) {
-	h := new(myHeap[int])
-	for i := 20; i > 0; i-- {
-		h.Push(0) // all elements are the same
-	}
-	Init[int](h)
-	h.verify(t, 0)
-
-	for i := 1; h.Len() > 0; i++ {
-		x := Pop[int](h)
-		h.verify(t, 0)
-		if x != 0 {
-			t.Errorf("%d.th pop got %d; want %d", i, x, 0)
-		}
-	}
-}
-
-func TestInit1(t *testing.T) {
-	h := new(myHeap[int])
-	for i := 20; i > 0; i-- {
-		h.Push(i) // all elements are different
-	}
-	Init[int](h)
-	h.verify(t, 0)
-
-	for i := 1; h.Len() > 0; i++ {
-		x := Pop[int](h)
-		h.verify(t, 0)
-		if x != i {
-			t.Errorf("%d.th pop got %d; want %d", i, x, i)
-		}
-	}
-}
-
-func Test(t *testing.T) {
-	h := new(myHeap[int])
-	h.verify(t, 0)
-
-	for i := 20; i > 10; i-- {
-		h.Push(i)
-	}
-	Init[int](h)
-	h.verify(t, 0)
-
-	for i := 10; i > 0; i-- {
-		Push[int](h, i)
-		h.verify(t, 0)
-	}
-
-	for i := 1; h.Len() > 0; i++ {
-		x := Pop[int](h)
-		if i < 20 {
-			Push[int](h, 20+i)
-		}
-		h.verify(t, 0)
-		if x != i {
-			t.Errorf("%d.th pop got %d; want %d", i, x, i)
-		}
-	}
-}
-
-func TestRemove0(t *testing.T) {
-	h := new(myHeap[int])
-	for i := 0; i < 10; i++ {
-		h.Push(i)
-	}
-	h.verify(t, 0)
-
-	for h.Len() > 0 {
-		i := h.Len() - 1
-		x := Remove[int](h, i)
-		if x != i {
-			t.Errorf("Remove(%d) got %d; want %d", i, x, i)
-		}
-		h.verify(t, 0)
-	}
-}
-
-func TestRemove1(t *testing.T) {
-	h := new(myHeap[int])
-	for i := 0; i < 10; i++ {
-		h.Push(i)
-	}
-	h.verify(t, 0)
-
-	for i := 0; h.Len() > 0; i++ {
-		x := Remove[int](h, 0)
-		if x != i {
-			t.Errorf("Remove(0) got %d; want %d", x, i)
-		}
-		h.verify(t, 0)
-	}
-}
-
-func TestRemove2(t *testing.T) {
-	N := 10
-
-	h := new(myHeap[int])
-	for i := 0; i < N; i++ {
-		h.Push(i)
-	}
-	h.verify(t, 0)
-
-	m := make(map[int]bool)
-	for h.Len() > 0 {
-		m[Remove[int](h, (h.Len()-1)/2)] = true
-		h.verify(t, 0)
-	}
-
-	if len(m) != N {
-		t.Errorf("len(m) = %d; want %d", len(m), N)
-	}
-	for i := 0; i < len(m); i++ {
-		if !m[i] {
-			t.Errorf("m[%d] doesn't exist", i)
-		}
-	}
-}
-
-func BenchmarkDup(b *testing.B) {
-	const n = 10000
-	h := make(myHeap[int], 0, n)
-	for i := 0; i < b.N; i++ {
-		for j := 0; j < n; j++ {
-			Push[int](&h, 0) // all elements are the same
-		}
-		for h.Len() > 0 {
-			Pop[int](&h)
-		}
-	}
-}
-
-func TestFix(t *testing.T) {
-	h := new(myHeap[int])
-	h.verify(t, 0)
-
-	for i := 200; i > 0; i -= 10 {
-		Push[int](h, i)
-	}
-	h.verify(t, 0)
-
-	if (*h)[0] != 10 {
-		t.Fatalf("Expected head to be 10, was %d", (*h)[0])
-	}
-	(*h)[0] = 210
-	Fix[int](h, 0)
-	h.verify(t, 0)
-
-	for i := 100; i > 0; i-- {
-		elem := rand.Intn(h.Len())
-		if i&1 == 0 {
-			(*h)[elem] *= 2
-		} else {
-			(*h)[elem] /= 2
-		}
-		Fix[int](h, elem)
-		h.verify(t, 0)
-	}
-}

tka/deeplink.go

@@ -1,221 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-package tka
-
-import (
-	"crypto/hmac"
-	"crypto/sha256"
-	"encoding/binary"
-	"encoding/hex"
-	"fmt"
-	"net/url"
-	"strings"
-)
-
-const (
-	DeeplinkTailscaleURLScheme = "tailscale"
-	DeeplinkCommandSign        = "sign-device"
-)
-
-// generateHMAC computes a SHA-256 HMAC for the concatenation of components,
-// using the Authority stateID as secret.
-func (a *Authority) generateHMAC(params NewDeeplinkParams) []byte {
-	stateID, _ := a.StateIDs()
-
-	key := make([]byte, 8)
-	binary.LittleEndian.PutUint64(key, stateID)
-	mac := hmac.New(sha256.New, key)
-	mac.Write([]byte(params.NodeKey))
-	mac.Write([]byte(params.TLPub))
-	mac.Write([]byte(params.DeviceName))
-	mac.Write([]byte(params.OSName))
-	mac.Write([]byte(params.LoginName))
-	return mac.Sum(nil)
-}
-
-type NewDeeplinkParams struct {
-	NodeKey    string
-	TLPub      string
-	DeviceName string
-	OSName     string
-	LoginName  string
-}
-
-// NewDeeplink creates a signed deeplink using the authority's stateID as a
-// secret. This deeplink can then be validated by ValidateDeeplink.
-func (a *Authority) NewDeeplink(params NewDeeplinkParams) (string, error) {
-	if params.NodeKey == "" || !strings.HasPrefix(params.NodeKey, "nodekey:") {
-		return "", fmt.Errorf("invalid node key %q", params.NodeKey)
-	}
-	if params.TLPub == "" || !strings.HasPrefix(params.TLPub, "tlpub:") {
-		return "", fmt.Errorf("invalid tlpub %q", params.TLPub)
-	}
-	if params.DeviceName == "" {
-		return "", fmt.Errorf("invalid device name %q", params.DeviceName)
-	}
-	if params.OSName == "" {
-		return "", fmt.Errorf("invalid os name %q", params.OSName)
-	}
-	if params.LoginName == "" {
-		return "", fmt.Errorf("invalid login name %q", params.LoginName)
-	}
-
-	u := url.URL{
-		Scheme: DeeplinkTailscaleURLScheme,
-		Host:   DeeplinkCommandSign,
-		Path:   "/v1/",
-	}
-	v := url.Values{}
-	v.Set("nk", params.NodeKey)
-	v.Set("tp", params.TLPub)
-	v.Set("dn", params.DeviceName)
-	v.Set("os", params.OSName)
-	v.Set("em", params.LoginName)
-
-	hmac := a.generateHMAC(params)
-	v.Set("hm", hex.EncodeToString(hmac))
-
-	u.RawQuery = v.Encode()
-	return u.String(), nil
-}
-
-type DeeplinkValidationResult struct {
-	IsValid      bool
-	Error        string
-	Version      uint8
-	NodeKey      string
-	TLPub        string
-	DeviceName   string
-	OSName       string
-	EmailAddress string
-}
-
-// ValidateDeeplink validates a device signing deeplink using the authority's stateID.
-// The input urlString follows this structure:
-//
-// tailscale://sign-device/v1/?nk=xxx&tp=xxx&dn=xxx&os=xxx&em=xxx&hm=xxx
-//
-// where:
-// - "nk" is the nodekey of the node being signed
-// - "tp" is the tailnet lock public key
-// - "dn" is the name of the node
-// - "os" is the operating system of the node
-// - "em" is the email address associated with the node
-// - "hm" is a SHA-256 HMAC computed over the concatenation of the above fields, encoded as a hex string
-func (a *Authority) ValidateDeeplink(urlString string) DeeplinkValidationResult {
-	parsedUrl, err := url.Parse(urlString)
-	if err != nil {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   err.Error(),
-		}
-	}
-
-	if parsedUrl.Scheme != DeeplinkTailscaleURLScheme {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   fmt.Sprintf("unhandled scheme %s, expected %s", parsedUrl.Scheme, DeeplinkTailscaleURLScheme),
-		}
-	}
-
-	if parsedUrl.Host != DeeplinkCommandSign {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   fmt.Sprintf("unhandled host %s, expected %s", parsedUrl.Host, DeeplinkCommandSign),
-		}
-	}
-
-	path := parsedUrl.EscapedPath()
-	pathComponents := strings.Split(path, "/")
-	if len(pathComponents) != 3 {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   "invalid path components number found",
-		}
-	}
-
-	if pathComponents[1] != "v1" {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   fmt.Sprintf("expected v1 deeplink version, found something else: %s", pathComponents[1]),
-		}
-	}
-
-	nodeKey := parsedUrl.Query().Get("nk")
-	if len(nodeKey) == 0 {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   "missing nk (NodeKey) query parameter",
-		}
-	}
-
-	tlPub := parsedUrl.Query().Get("tp")
-	if len(tlPub) == 0 {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   "missing tp (TLPub) query parameter",
-		}
-	}
-
-	deviceName := parsedUrl.Query().Get("dn")
-	if len(deviceName) == 0 {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   "missing dn (DeviceName) query parameter",
-		}
-	}
-
-	osName := parsedUrl.Query().Get("os")
-	if len(deviceName) == 0 {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   "missing os (OSName) query parameter",
-		}
-	}
-
-	emailAddress := parsedUrl.Query().Get("em")
-	if len(emailAddress) == 0 {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   "missing em (EmailAddress) query parameter",
-		}
-	}
-
-	hmacString := parsedUrl.Query().Get("hm")
-	if len(hmacString) == 0 {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   "missing hm (HMAC) query parameter",
-		}
-	}
-
-	computedHMAC := a.generateHMAC(NewDeeplinkParams{
-		NodeKey:    nodeKey,
-		TLPub:      tlPub,
-		DeviceName: deviceName,
-		OSName:     osName,
-		LoginName:  emailAddress,
-	})
-
-	hmacHexBytes, err := hex.DecodeString(hmacString)
-	if err != nil {
-		return DeeplinkValidationResult{IsValid: false, Error: "could not hex-decode hmac"}
-	}
-
-	if !hmac.Equal(computedHMAC, hmacHexBytes) {
-		return DeeplinkValidationResult{
-			IsValid: false,
-			Error:   "hmac authentication failed",
-		}
-	}
-
-	return DeeplinkValidationResult{
-		IsValid:      true,
-		NodeKey:      nodeKey,
-		TLPub:        tlPub,
-		DeviceName:   deviceName,
-		OSName:       osName,
-		EmailAddress: emailAddress,
-	}
-}

tka/deeplink_test.go

@@ -1,52 +0,0 @@
-// Copyright (c) Tailscale Inc & AUTHORS
-// SPDX-License-Identifier: BSD-3-Clause
-
-package tka
-
-import (
-	"testing"
-)
-
-func TestGenerateDeeplink(t *testing.T) {
-	pub, _ := testingKey25519(t, 1)
-	key := Key{Kind: Key25519, Public: pub, Votes: 2}
-	c := newTestchain(t, `
-        G1 -> L1
-
-        G1.template = genesis
-    `,
-		optTemplate("genesis", AUM{MessageKind: AUMCheckpoint, State: &State{
-			Keys:               []Key{key},
-			DisablementSecrets: [][]byte{DisablementKDF([]byte{1, 2, 3})},
-		}}),
-	)
-	a, _ := Open(c.Chonk())
-
-	nodeKey := "nodekey:1234567890"
-	tlPub := "tlpub:1234567890"
-	deviceName := "Example Device"
-	osName := "iOS"
-	loginName := "insecure@example.com"
-
-	deeplink, err := a.NewDeeplink(NewDeeplinkParams{
-		NodeKey:    nodeKey,
-		TLPub:      tlPub,
-		DeviceName: deviceName,
-		OSName:     osName,
-		LoginName:  loginName,
-	})
-	if err != nil {
-		t.Errorf("deeplink generation failed: %v", err)
-	}
-
-	res := a.ValidateDeeplink(deeplink)
-	if !res.IsValid {
-		t.Errorf("deeplink validation failed: %s", res.Error)
-	}
-	if res.NodeKey != nodeKey {
-		t.Errorf("node key mismatch: %s != %s", res.NodeKey, nodeKey)
-	}
-	if res.TLPub != tlPub {
-		t.Errorf("tlpub mismatch: %s != %s", res.TLPub, tlPub)
-	}
-}

tool/gocross/autoflags.go

@@ -111,11 +111,7 @@ func autoflagsForTest(argv []string, env *Environment, goroot, nativeGOOS, nativ
 			// e.g. -mmacosx-version-min=11.3, -miphoneos-version-min=15.0
 			switch {
 			case env.IsSet("IPHONEOS_DEPLOYMENT_TARGET"):
-				if env.Get("TARGET_DEVICE_PLATFORM_NAME", "") == "iphonesimulator" {
-					xcodeFlags = append(xcodeFlags, "-miphonesimulator-version-min="+env.Get("IPHONEOS_DEPLOYMENT_TARGET", ""))
-				} else {
-					xcodeFlags = append(xcodeFlags, "-miphoneos-version-min="+env.Get("IPHONEOS_DEPLOYMENT_TARGET", ""))
-				}
+				xcodeFlags = append(xcodeFlags, "-miphoneos-version-min="+env.Get("IPHONEOS_DEPLOYMENT_TARGET", ""))
 			case env.IsSet("MACOSX_DEPLOYMENT_TARGET"):
 				xcodeFlags = append(xcodeFlags, "-mmacosx-version-min="+env.Get("MACOSX_DEPLOYMENT_TARGET", ""))
 			case env.IsSet("TVOS_DEPLOYMENT_TARGET"):

tool/gocross/gocross-wrapper.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 # Copyright (c) Tailscale Inc & AUTHORS
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -6,9 +6,9 @@
 # transparently builds gocross using a "bootstrap" Go toolchain, and
 # then invokes gocross.
 
-set -euo pipefail
+set -eu
 
-if [[ "${CI:-}" == "true" ]]; then
+if [ "${CI:-}" = "true" ]; then
     set -x
 fi
 
@@ -17,7 +17,7 @@ fi
 # accidentally mutate the input environment that will get passed to gocross at
 # the bottom of this script.
 (
-repo_root="${BASH_SOURCE%/*}/../.."
+repo_root="$(dirname $0)/../.."
 
 # Figuring out if gocross needs a rebuild, as well as the rebuild itself, need
 # to happen with CWD inside this repo. Since we're in a subshell entirely
@@ -28,21 +28,16 @@ cd "$repo_root"
 
 toolchain="$HOME/.cache/tailscale-go"
 
-if [[ -d "$toolchain" ]]; then
+if [ -d "$toolchain" ]; then
     # A toolchain exists, but is it recent enough to compile gocross? If not,
     # wipe it out so that the next if block fetches a usable one.
     want_go_minor=$(grep -E '^go ' "go.mod" | cut -f2 -d'.')
-    have_go_minor=$(head -1 "$toolchain/VERSION" | cut -f2 -d'.')
-    # Shortly before stable releases, we run release candidate
-    # toolchains, which have a non-numeric suffix on the version
-    # number. Remove the rc qualifier, we just care about the minor
-    # version.
-    have_go_minor="${have_go_minor%rc*}"
-    if [[ -z "$have_go_minor" || "$have_go_minor" -lt "$want_go_minor" ]]; then
+    have_go_minor=$(cut -f2 -d'.' <$toolchain/VERSION)
+    if [ -z "$have_go_minor" -o "$have_go_minor" -lt "$want_go_minor" ]; then
         rm -rf "$toolchain" "$toolchain.extracted"
     fi
 fi
-if [[ ! -d "$toolchain" ]]; then
+if [ ! -d "$toolchain" ]; then
     mkdir -p "$HOME/.cache"
 
     # We need any Go toolchain to build gocross, but the toolchain also has to
@@ -61,10 +56,10 @@ if [[ ! -d "$toolchain" ]]; then
         # (we do not build tailscale-go for other targets).
         HOST_OS=$(uname -s | tr A-Z a-z)
         HOST_ARCH="$(uname -m)"
-        if [[ "$HOST_ARCH" == "aarch64" ]]; then
+        if [ "$HOST_ARCH" = "aarch64" ]; then
             # Go uses the name "arm64".
             HOST_ARCH="arm64"
-        elif [[ "$HOST_ARCH" == "x86_64" ]]; then
+        elif [ "$HOST_ARCH" = "x86_64" ]; then
             # Go uses the name "amd64".
             HOST_ARCH="amd64"
         fi
@@ -88,13 +83,13 @@ fi
 gocross_path="gocross"
 gocross_ok=0
 wantver="$(git rev-parse HEAD)"
-if [[ -x "$gocross_path" ]]; then
+if [ -x "$gocross_path" ]; then
 	gotver="$($gocross_path gocross-version 2>/dev/null || echo '')"
-	if [[ "$gotver" == "$wantver" ]]; then
+	if [ "$gotver" = "$wantver" ]; then
 		gocross_ok=1
 	fi
 fi
-if [[ "$gocross_ok" == "0" ]]; then
+if [ "$gocross_ok" = "0" ]; then
     unset GOOS
     unset GOARCH
     unset GO111MODULE
@@ -104,4 +99,4 @@ if [[ "$gocross_ok" == "0" ]]; then
 fi
 ) # End of the subshell execution.
 
-exec "${BASH_SOURCE%/*}/../../gocross" "$@"
+exec "$(dirname $0)/../../gocross" "$@"

tsnet/tsnet.go

@@ -22,7 +22,6 @@ import (
 	"net/netip"
 	"os"
 	"path/filepath"
-	"runtime"
 	"strconv"
 	"strings"
 	"sync"
@@ -61,7 +60,7 @@ func inTest() bool { return flag.Lookup("test.v") != nil }
 
 // Server is an embedded Tailscale server.
 //
-// Its exported fields may be changed until the first method call.
+// Its exported fields may be changed until the first call to Listen.
 type Server struct {
 	// Dir specifies the name of the directory to use for
 	// state. If empty, a directory is selected automatically
@@ -80,7 +79,7 @@ type Server struct {
 	// If nil, a new FileStore is initialized at `Dir/tailscaled.state`.
 	// See tailscale.com/ipn/store for supported stores.
 	//
-	// Logs will automatically be uploaded to log.tailscale.io,
+	// Logs will automatically be uploaded to uploaded to log.tailscale.io,
 	// where the configuration file for logging will be saved at
 	// `Dir/tailscaled.log.conf`.
 	Store ipn.StateStore
@@ -108,11 +107,6 @@ type Server struct {
 	// If empty, the Tailscale default is used.
 	ControlURL string
 
-	// Port is the UDP port to listen on for WireGuard and peer-to-peer
-	// traffic. If zero, a port is automatically selected. Leave this
-	// field at zero unless you know what you are doing.
-	Port uint16
-
 	getCertForTesting func(*tls.ClientHelloInfo) (*tls.Certificate, error)
 
 	initOnce         sync.Once
@@ -447,16 +441,7 @@ func (s *Server) start() (reterr error) {
 
 	exe, err := os.Executable()
 	if err != nil {
-		switch runtime.GOOS {
-		case "js", "wasip1":
-			// These platforms don't implement os.Executable (at least as of Go
-			// 1.21), but we don't really care much: it's only used as a default
-			// directory and hostname when they're not supplied. But we can fall
-			// back to "tsnet" as well.
-			exe = "tsnet"
-		default:
-			return err
-		}
+		return err
 	}
 	prog := strings.TrimSuffix(strings.ToLower(filepath.Base(exe)), ".exe")
 
@@ -507,7 +492,7 @@ func (s *Server) start() (reterr error) {
 	sys := new(tsd.System)
 	s.dialer = &tsdial.Dialer{Logf: logf} // mutated below (before used)
 	eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
-		ListenPort:   s.Port,
+		ListenPort:   0,
 		NetMon:       s.netMon,
 		Dialer:       s.dialer,
 		SetSubsystem: sys.Set,

tsnet/tsnet_test.go

@@ -30,7 +30,6 @@ import (
 	"time"
 
 	"golang.org/x/net/proxy"
-	"tailscale.com/cmd/testwrapper/flakytest"
 	"tailscale.com/ipn"
 	"tailscale.com/ipn/store/mem"
 	"tailscale.com/net/netns"
@@ -283,7 +282,6 @@ func TestConn(t *testing.T) {
 }
 
 func TestLoopbackLocalAPI(t *testing.T) {
-	flakytest.Mark(t, "https://github.com/tailscale/tailscale/issues/8557")
 	tstest.ResourceCheck(t)
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
@@ -358,7 +356,6 @@ func TestLoopbackLocalAPI(t *testing.T) {
 }
 
 func TestLoopbackSOCKS5(t *testing.T) {
-	flakytest.Mark(t, "https://github.com/tailscale/tailscale/issues/8198")
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
 

tstest/clock.go

@@ -4,686 +4,57 @@
 package tstest
 
 import (
-	"container/heap"
 	"sync"
 	"time"
-
-	"tailscale.com/tstime"
-	"tailscale.com/util/mak"
 )
 
-// ClockOpts is used to configure the initial settings for a Clock. Once the
-// settings are configured as desired, call NewClock to get the resulting Clock.
-type ClockOpts struct {
-	// Start is the starting time for the Clock. When FollowRealTime is false,
-	// Start is also the value that will be returned by the first call
-	// to Clock.Now.
-	Start time.Time
-	// Step is the amount of time the Clock will advance whenever Clock.Now is
-	// called. If set to zero, the Clock will only advance when Clock.Advance is
-	// called and/or if FollowRealTime is true.
-	//
-	// FollowRealTime and Step cannot be enabled at the same time.
-	Step time.Duration
-
-	// TimerChannelSize configures the maximum buffered ticks that are
-	// permitted in the channel of any Timer and Ticker created by this Clock.
-	// The special value 0 means to use the default of 1. The buffer may need to
-	// be increased if time is advanced by more than a single tick and proper
-	// functioning of the test requires that the ticks are not lost.
-	TimerChannelSize int
-
-	// FollowRealTime makes the simulated time increment along with real time.
-	// It is a compromise between determinism and the difficulty of explicitly
-	// managing the simulated time via Step or Clock.Advance. When
-	// FollowRealTime is set, calls to Now() and PeekNow() will add the
-	// elapsed real-world time to the simulated time.
-	//
-	// FollowRealTime and Step cannot be enabled at the same time.
-	FollowRealTime bool
-}
-
-// NewClock creates a Clock with the specified settings. To create a
-// Clock with only the default settings, new(Clock) is equivalent, except that
-// the start time will not be computed until one of the receivers is called.
-func NewClock(co ClockOpts) *Clock {
-	if co.FollowRealTime && co.Step != 0 {
-		panic("only one of FollowRealTime and Step are allowed in NewClock")
-	}
-
-	return newClockInternal(co, nil)
-}
-
-// newClockInternal creates a Clock with the specified settings and allows
-// specifying a non-standard realTimeClock.
-func newClockInternal(co ClockOpts, rtClock tstime.Clock) *Clock {
-	if !co.FollowRealTime && rtClock != nil {
-		panic("rtClock can only be set with FollowRealTime enabled")
-	}
-
-	if co.FollowRealTime && rtClock == nil {
-		rtClock = new(tstime.StdClock)
-	}
-
-	c := &Clock{
-		start:            co.Start,
-		realTimeClock:    rtClock,
-		step:             co.Step,
-		timerChannelSize: co.TimerChannelSize,
-	}
-	c.init() // init now to capture the current time when co.Start.IsZero()
-	return c
-}
-
 // Clock is a testing clock that advances every time its Now method is
-// called, beginning at its start time. If no start time is specified using
-// ClockBuilder, an arbitrary start time will be selected when the Clock is
-// created and can be retrieved by calling Clock.Start().
+// called, beginning at Start.
+//
+// The zero value starts virtual time at an arbitrary value recorded
+// in Start on the first call to Now, and time never advances.
 type Clock struct {
-	// start is the first value returned by Now. It must not be modified after
-	// init is called.
-	start time.Time
+	// Start is the first value returned by Now.
+	Start time.Time
+	// Step is how much to advance with each Now call.
+	Step time.Duration
+	// Present is the time that the next Now call will receive.
+	Present time.Time
 
-	// realTimeClock, if not nil, indicates that the Clock shall move forward
-	// according to realTimeClock + the accumulated calls to Advance. This can
-	// make writing tests easier that require some control over the clock but do
-	// not need exact control over the clock. While step can also be used for
-	// this purpose, it is harder to control how quickly time moves using step.
-	realTimeClock tstime.Clock
-
-	initOnce sync.Once
-	mu       sync.Mutex
-
-	// step is how much to advance with each Now call.
-	step time.Duration
-	// present is the last value returned by Now (and will be returned again by
-	// PeekNow).
-	present time.Time
-	// realTime is the time from realTimeClock corresponding to the current
-	// value of present.
-	realTime time.Time
-	// skipStep indicates that the next call to Now should not add step to
-	// present. This occurs after initialization and after Advance.
-	skipStep bool
-	// timerChannelSize is the buffer size to use for channels created by
-	// NewTimer and NewTicker.
-	timerChannelSize int
-
-	events eventManager
-}
-
-func (c *Clock) init() {
-	c.initOnce.Do(func() {
-		if c.realTimeClock != nil {
-			c.realTime = c.realTimeClock.Now()
-		}
-		if c.start.IsZero() {
-			if c.realTime.IsZero() {
-				c.start = time.Now()
-			} else {
-				c.start = c.realTime
-			}
-		}
-		if c.timerChannelSize == 0 {
-			c.timerChannelSize = 1
-		}
-		c.present = c.start
-		c.skipStep = true
-		c.events.AdvanceTo(c.present)
-	})
+	sync.Mutex
 }
 
 // Now returns the virtual clock's current time, and advances it
 // according to its step configuration.
 func (c *Clock) Now() time.Time {
-	c.init()
-	rt := c.maybeGetRealTime()
+	c.Lock()
+	defer c.Unlock()
+	c.initLocked()
+	step := c.Step
+	ret := c.Present
+	c.Present = c.Present.Add(step)
+	return ret
+}
 
-	c.mu.Lock()
-	defer c.mu.Unlock()
+func (c *Clock) Advance(d time.Duration) {
+	c.Lock()
+	defer c.Unlock()
+	c.initLocked()
+	c.Present = c.Present.Add(d)
+}
 
-	step := c.step
-	if c.skipStep {
-		step = 0
-		c.skipStep = false
+func (c *Clock) initLocked() {
+	if c.Start.IsZero() {
+		c.Start = time.Now()
 	}
-	c.advanceLocked(rt, step)
-
-	return c.present
-}
-
-func (c *Clock) maybeGetRealTime() time.Time {
-	if c.realTimeClock == nil {
-		return time.Time{}
-	}
-	return c.realTimeClock.Now()
-}
-
-func (c *Clock) advanceLocked(now time.Time, add time.Duration) {
-	if !now.IsZero() {
-		add += now.Sub(c.realTime)
-		c.realTime = now
-	}
-	if add == 0 {
-		return
-	}
-	c.present = c.present.Add(add)
-	c.events.AdvanceTo(c.present)
-}
-
-// PeekNow returns the last time reported by Now. If Now has never been called,
-// PeekNow returns the same value as GetStart.
-func (c *Clock) PeekNow() time.Time {
-	c.init()
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return c.present
-}
-
-// Advance moves simulated time forward or backwards by a relative amount. Any
-// Timer or Ticker that is waiting will fire at the requested point in simulated
-// time. Advance returns the new simulated time. If this Clock follows real time
-// then the next call to Now will equal the return value of Advance + the
-// elapsed time since calling Advance. Otherwise, the next call to Now will
-// equal the return value of Advance, regardless of the current step.
-func (c *Clock) Advance(d time.Duration) time.Time {
-	c.init()
-	rt := c.maybeGetRealTime()
-
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	c.skipStep = true
-
-	c.advanceLocked(rt, d)
-	return c.present
-}
-
-// AdvanceTo moves simulated time to a new absolute value. Any Timer or Ticker
-// that is waiting will fire at the requested point in simulated time. If this
-// Clock follows real time then the next call to Now will equal t + the elapsed
-// time since calling Advance. Otherwise, the next call to Now will equal t,
-// regardless of the configured step.
-func (c *Clock) AdvanceTo(t time.Time) {
-	c.init()
-	rt := c.maybeGetRealTime()
-
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	c.skipStep = true
-	c.realTime = rt
-	c.present = t
-	c.events.AdvanceTo(c.present)
-}
-
-// GetStart returns the initial simulated time when this Clock was created.
-func (c *Clock) GetStart() time.Time {
-	c.init()
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return c.start
-}
-
-// GetStep returns the amount that simulated time advances on every call to Now.
-func (c *Clock) GetStep() time.Duration {
-	c.init()
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return c.step
-}
-
-// SetStep updates the amount that simulated time advances on every call to Now.
-func (c *Clock) SetStep(d time.Duration) {
-	c.init()
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	c.step = d
-}
-
-// SetTimerChannelSize changes the channel size for any Timer or Ticker created
-// in the future. It does not affect those that were already created.
-func (c *Clock) SetTimerChannelSize(n int) {
-	c.init()
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	c.timerChannelSize = n
-}
-
-// NewTicker returns a Ticker that uses this Clock for accessing the current
-// time.
-func (c *Clock) NewTicker(d time.Duration) (tstime.TickerController, <-chan time.Time) {
-	c.init()
-	rt := c.maybeGetRealTime()
-
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	c.advanceLocked(rt, 0)
-	t := &Ticker{
-		nextTrigger: c.present.Add(d),
-		period:      d,
-		em:          &c.events,
-	}
-	t.init(c.timerChannelSize)
-	return t, t.C
-}
-
-// NewTimer returns a Timer that uses this Clock for accessing the current
-// time.
-func (c *Clock) NewTimer(d time.Duration) (tstime.TimerController, <-chan time.Time) {
-	c.init()
-	rt := c.maybeGetRealTime()
-
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	c.advanceLocked(rt, 0)
-	t := &Timer{
-		nextTrigger: c.present.Add(d),
-		em:          &c.events,
-	}
-	t.init(c.timerChannelSize, nil)
-	return t, t.C
-}
-
-// AfterFunc returns a Timer that calls f when it fires, using this Clock for
-// accessing the current time.
-func (c *Clock) AfterFunc(d time.Duration, f func()) tstime.TimerController {
-	c.init()
-	rt := c.maybeGetRealTime()
-
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	c.advanceLocked(rt, 0)
-	t := &Timer{
-		nextTrigger: c.present.Add(d),
-		em:          &c.events,
-	}
-	t.init(c.timerChannelSize, f)
-	return t
-}
-
-// eventHandler offers a common interface for Timer and Ticker events to avoid
-// code duplication in eventManager.
-type eventHandler interface {
-	// Fire signals the event. The provided time is written to the event's
-	// channel as the current time. The return value is the next time this event
-	// should fire, otherwise if it is zero then the event will be removed from
-	// the eventManager.
-	Fire(time.Time) time.Time
-}
-
-// event tracks details about an upcoming Timer or Ticker firing.
-type event struct {
-	position int       // The current index in the heap, needed for heap.Fix and heap.Remove.
-	when     time.Time // A cache of the next time the event triggers to avoid locking issues if we were to get it from eh.
-	eh       eventHandler
-}
-
-// eventManager tracks pending events created by Timer and Ticker. eventManager
-// implements heap.Interface for efficient lookups of the next event.
-type eventManager struct {
-	// clock is a real time clock for scheduling events with. When clock is nil,
-	// events only fire when AdvanceTo is called by the simulated clock that
-	// this eventManager belongs to. When clock is not nil, events may fire when
-	// timer triggers.
-	clock tstime.Clock
-
-	mu            sync.Mutex
-	now           time.Time
-	heap          []*event
-	reverseLookup map[eventHandler]*event
-
-	// timer is an AfterFunc that triggers at heap[0].when.Sub(now) relative to
-	// the time represented by clock. In other words, if clock is real world
-	// time, then if an event is scheduled 1 second into the future in the
-	// simulated time, then the event will trigger after 1 second of actual test
-	// execution time (unless the test advances simulated time, in which case
-	// the timer is updated accordingly). This makes tests easier to write in
-	// situations where the simulated time only needs to be partially
-	// controlled, and the test writer wishes for simulated time to pass with an
-	// offset but still synchronized with the real world.
-	//
-	// In the future, this could be extended to allow simulated time to run at a
-	// multiple of real world time.
-	timer tstime.TimerController
-}
-
-func (em *eventManager) handleTimer() {
-	rt := em.clock.Now()
-	em.AdvanceTo(rt)
-}
-
-// Push implements heap.Interface.Push and must only be called by heap funcs
-// with em.mu already held.
-func (em *eventManager) Push(x any) {
-	e, ok := x.(*event)
-	if !ok {
-		panic("incorrect event type")
-	}
-	if e == nil {
-		panic("nil event")
-	}
-
-	mak.Set(&em.reverseLookup, e.eh, e)
-	e.position = len(em.heap)
-	em.heap = append(em.heap, e)
-}
-
-// Pop implements heap.Interface.Pop and must only be called by heap funcs with
-// em.mu already held.
-func (em *eventManager) Pop() any {
-	e := em.heap[len(em.heap)-1]
-	em.heap = em.heap[:len(em.heap)-1]
-	delete(em.reverseLookup, e.eh)
-	return e
-}
-
-// Len implements sort.Interface.Len and must only be called by heap funcs with
-// em.mu already held.
-func (em *eventManager) Len() int {
-	return len(em.heap)
-}
-
-// Less implements sort.Interface.Less and must only be called by heap funcs
-// with em.mu already held.
-func (em *eventManager) Less(i, j int) bool {
-	return em.heap[i].when.Before(em.heap[j].when)
-}
-
-// Swap implements sort.Interface.Swap and must only be called by heap funcs
-// with em.mu already held.
-func (em *eventManager) Swap(i, j int) {
-	em.heap[i], em.heap[j] = em.heap[j], em.heap[i]
-	em.heap[i].position = i
-	em.heap[j].position = j
-}
-
-// Reschedule adds/updates/deletes an event in the heap, whichever
-// operation is applicable (use a zero time to delete).
-func (em *eventManager) Reschedule(eh eventHandler, t time.Time) {
-	em.mu.Lock()
-	defer em.mu.Unlock()
-	defer em.updateTimerLocked()
-
-	e, ok := em.reverseLookup[eh]
-	if !ok {
-		if t.IsZero() {
-			// eh is not scheduled and also not active, so do nothing.
-			return
-		}
-		// eh is not scheduled but is active, so add it.
-		heap.Push(em, &event{
-			when: t,
-			eh:   eh,
-		})
-		em.processEventsLocked(em.now) // This is always safe and required when !t.After(em.now).
-		return
-	}
-
-	if t.IsZero() {
-		// e is scheduled but not active, so remove it.
-		heap.Remove(em, e.position)
-		return
-	}
-
-	// e is scheduled and active, so update it.
-	e.when = t
-	heap.Fix(em, e.position)
-	em.processEventsLocked(em.now) // This is always safe and required when !t.After(em.now).
-}
-
-// AdvanceTo updates the current time to tm and fires all events scheduled
-// before or equal to tm. When an event fires, it may request rescheduling and
-// the rescheduled events will be combined with the other existing events that
-// are waiting, and will be run in the unified ordering. A poorly behaved event
-// may theoretically prevent this from ever completing, but both Timer and
-// Ticker require positive steps into the future.
-func (em *eventManager) AdvanceTo(tm time.Time) {
-	em.mu.Lock()
-	defer em.mu.Unlock()
-	defer em.updateTimerLocked()
-
-	em.processEventsLocked(tm)
-	em.now = tm
-}
-
-// Now returns the cached current time. It is intended for use by a Timer or
-// Ticker that needs to convert a relative time to an absolute time.
-func (em *eventManager) Now() time.Time {
-	em.mu.Lock()
-	defer em.mu.Unlock()
-	return em.now
-}
-
-func (em *eventManager) processEventsLocked(tm time.Time) {
-	for len(em.heap) > 0 && !em.heap[0].when.After(tm) {
-		// Ideally some jitter would be added here but it's difficult to do so
-		// in a deterministic fashion.
-		em.now = em.heap[0].when
-
-		if nextFire := em.heap[0].eh.Fire(em.now); !nextFire.IsZero() {
-			em.heap[0].when = nextFire
-			heap.Fix(em, 0)
-		} else {
-			heap.Pop(em)
-		}
+	if c.Present.Before(c.Start) {
+		c.Present = c.Start
 	}
 }
 
-func (em *eventManager) updateTimerLocked() {
-	if em.clock == nil {
-		return
-	}
-	if len(em.heap) == 0 {
-		if em.timer != nil {
-			em.timer.Stop()
-		}
-		return
-	}
-
-	timeToEvent := em.heap[0].when.Sub(em.now)
-	if em.timer == nil {
-		em.timer = em.clock.AfterFunc(timeToEvent, em.handleTimer)
-		return
-	}
-	em.timer.Reset(timeToEvent)
-}
-
-// Ticker is a time.Ticker lookalike for use in tests that need to control when
-// events fire. Ticker could be made standalone in future but for now is
-// expected to be paired with a Clock and created by Clock.NewTicker.
-type Ticker struct {
-	C <-chan time.Time // The channel on which ticks are delivered.
-
-	// em is the eventManager to be notified when nextTrigger changes.
-	// eventManager has its own mutex, and the pointer is immutable, therefore
-	// em can be accessed without holding mu.
-	em *eventManager
-
-	c chan<- time.Time // The writer side of C.
-
-	mu sync.Mutex
-
-	// nextTrigger is the time of the ticker's next scheduled activation. When
-	// Fire activates the ticker, nextTrigger is the timestamp written to the
-	// channel.
-	nextTrigger time.Time
-
-	// period is the duration that is added to nextTrigger when the ticker
-	// fires.
-	period time.Duration
-}
-
-func (t *Ticker) init(channelSize int) {
-	if channelSize <= 0 {
-		panic("ticker channel size must be non-negative")
-	}
-	c := make(chan time.Time, channelSize)
-	t.c = c
-	t.C = c
-	t.em.Reschedule(t, t.nextTrigger)
-}
-
-// Fire triggers the ticker. curTime is the timestamp to write to the channel.
-// The next trigger time for the ticker is updated to the last computed trigger
-// time + the ticker period (set at creation or using Reset). The next trigger
-// time is computed this way to match standard time.Ticker behavior, which
-// prevents accumulation of long term drift caused by delays in event execution.
-func (t *Ticker) Fire(curTime time.Time) time.Time {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-
-	if t.nextTrigger.IsZero() {
-		return time.Time{}
-	}
-	select {
-	case t.c <- curTime:
-	default:
-	}
-	t.nextTrigger = t.nextTrigger.Add(t.period)
-
-	return t.nextTrigger
-}
-
-// Reset adjusts the Ticker's period to d and reschedules the next fire time to
-// the current simulated time + d.
-func (t *Ticker) Reset(d time.Duration) {
-	if d <= 0 {
-		// The standard time.Ticker requires a positive period.
-		panic("non-positive period for Ticker.Reset")
-	}
-
-	now := t.em.Now()
-
-	t.mu.Lock()
-	t.resetLocked(now.Add(d), d)
-	t.mu.Unlock()
-
-	t.em.Reschedule(t, t.nextTrigger)
-}
-
-// ResetAbsolute adjusts the Ticker's period to d and reschedules the next fire
-// time to nextTrigger.
-func (t *Ticker) ResetAbsolute(nextTrigger time.Time, d time.Duration) {
-	if nextTrigger.IsZero() {
-		panic("zero nextTrigger time for ResetAbsolute")
-	}
-	if d <= 0 {
-		panic("non-positive period for ResetAbsolute")
-	}
-
-	t.mu.Lock()
-	t.resetLocked(nextTrigger, d)
-	t.mu.Unlock()
-
-	t.em.Reschedule(t, t.nextTrigger)
-}
-
-func (t *Ticker) resetLocked(nextTrigger time.Time, d time.Duration) {
-	t.nextTrigger = nextTrigger
-	t.period = d
-}
-
-// Stop deactivates the Ticker.
-func (t *Ticker) Stop() {
-	t.mu.Lock()
-	t.nextTrigger = time.Time{}
-	t.mu.Unlock()
-
-	t.em.Reschedule(t, t.nextTrigger)
-}
-
-// Timer is a time.Timer lookalike for use in tests that need to control when
-// events fire. Timer could be made standalone in future but for now must be
-// paired with a Clock and created by Clock.NewTimer.
-type Timer struct {
-	C <-chan time.Time // The channel on which ticks are delivered.
-
-	// em is the eventManager to be notified when nextTrigger changes.
-	// eventManager has its own mutex, and the pointer is immutable, therefore
-	// em can be accessed without holding mu.
-	em *eventManager
-
-	f func(time.Time) // The function to call when the timer expires.
-
-	mu sync.Mutex
-
-	// nextTrigger is the time of the ticker's next scheduled activation. When
-	// Fire activates the ticker, nextTrigger is the timestamp written to the
-	// channel.
-	nextTrigger time.Time
-}
-
-func (t *Timer) init(channelSize int, afterFunc func()) {
-	if channelSize <= 0 {
-		panic("ticker channel size must be non-negative")
-	}
-	c := make(chan time.Time, channelSize)
-	t.C = c
-	if afterFunc == nil {
-		t.f = func(curTime time.Time) {
-			select {
-			case c <- curTime:
-			default:
-			}
-		}
-	} else {
-		t.f = func(_ time.Time) { afterFunc() }
-	}
-	t.em.Reschedule(t, t.nextTrigger)
-}
-
-// Fire triggers the ticker. curTime is the timestamp to write to the channel.
-// The next trigger time for the ticker is updated to the last computed trigger
-// time + the ticker period (set at creation or using Reset). The next trigger
-// time is computed this way to match standard time.Ticker behavior, which
-// prevents accumulation of long term drift caused by delays in event execution.
-func (t *Timer) Fire(curTime time.Time) time.Time {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-
-	if t.nextTrigger.IsZero() {
-		return time.Time{}
-	}
-	t.nextTrigger = time.Time{}
-	t.f(curTime)
-	return time.Time{}
-}
-
-// Reset reschedules the next fire time to the current simulated time + d.
-// Reset reports whether the timer was still active before the reset.
-func (t *Timer) Reset(d time.Duration) bool {
-	if d <= 0 {
-		// The standard time.Timer requires a positive delay.
-		panic("non-positive delay for Timer.Reset")
-	}
-
-	return t.reset(t.em.Now().Add(d))
-}
-
-// ResetAbsolute reschedules the next fire time to nextTrigger.
-// ResetAbsolute reports whether the timer was still active before the reset.
-func (t *Timer) ResetAbsolute(nextTrigger time.Time) bool {
-	if nextTrigger.IsZero() {
-		panic("zero nextTrigger time for ResetAbsolute")
-	}
-
-	return t.reset(nextTrigger)
-}
-
-// Stop deactivates the Timer. Stop reports whether the timer was active before
-// stopping.
-func (t *Timer) Stop() bool {
-	return t.reset(time.Time{})
-}
-
-func (t *Timer) reset(nextTrigger time.Time) bool {
-	t.mu.Lock()
-	wasActive := !t.nextTrigger.IsZero()
-	t.nextTrigger = nextTrigger
-	t.mu.Unlock()
-
-	t.em.Reschedule(t, t.nextTrigger)
-	return wasActive
+// Reset rewinds the virtual clock to its start time.
+func (c *Clock) Reset() {
+	c.Lock()
+	defer c.Unlock()
+	c.Present = c.Start
 }