ipn/ipnlocal: add primary and approved routes metrics

WIP

Updates tailscale/corp#22075

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

wgengine/userspace.go

@@ -49,6 +49,7 @@ import (
 	"tailscale.com/util/mak"
 	"tailscale.com/util/set"
 	"tailscale.com/util/testenv"
+	"tailscale.com/util/usermetric"
 	"tailscale.com/version"
 	"tailscale.com/wgengine/capture"
 	"tailscale.com/wgengine/filter"
@@ -195,6 +196,9 @@ type Config struct {
 	// HealthTracker, if non-nil, is the health tracker to use.
 	HealthTracker *health.Tracker
 
+	// UserMetricsRegistry, if non-nil, is the usermetrics registry to use.
+	UserMetricsRegistry *usermetric.Registry
+
 	// Dialer is the dialer to use for outbound connections.
 	// If nil, a new Dialer is created.
 	Dialer *tsdial.Dialer
@@ -249,6 +253,8 @@ func NewFakeUserspaceEngine(logf logger.Logf, opts ...any) (Engine, error) {
 			conf.ControlKnobs = v
 		case *health.Tracker:
 			conf.HealthTracker = v
+		case *usermetric.Registry:
+			conf.UserMetricsRegistry = v
 		default:
 			return nil, fmt.Errorf("unknown option type %T", v)
 		}
@@ -289,9 +295,9 @@ func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error)
 
 	var tsTUNDev *tstun.Wrapper
 	if conf.IsTAP {
-		tsTUNDev = tstun.WrapTAP(logf, conf.Tun)
+		tsTUNDev = tstun.WrapTAP(logf, conf.Tun, conf.UserMetricsRegistry)
 	} else {
-		tsTUNDev = tstun.Wrap(logf, conf.Tun)
+		tsTUNDev = tstun.Wrap(logf, conf.Tun, conf.UserMetricsRegistry)
 	}
 	closePool.add(tsTUNDev)
 
@@ -379,17 +385,18 @@ func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error)
 		}
 	}
 	magicsockOpts := magicsock.Options{
-		Logf:             logf,
-		Port:             conf.ListenPort,
-		EndpointsFunc:    endpointsFn,
-		DERPActiveFunc:   e.RequestStatus,
-		IdleFunc:         e.tundev.IdleDuration,
-		NoteRecvActivity: e.noteRecvActivity,
-		NetMon:           e.netMon,
-		HealthTracker:    e.health,
-		ControlKnobs:     conf.ControlKnobs,
-		OnPortUpdate:     onPortUpdate,
-		PeerByKeyFunc:    e.PeerByKey,
+		Logf:                logf,
+		Port:                conf.ListenPort,
+		EndpointsFunc:       endpointsFn,
+		DERPActiveFunc:      e.RequestStatus,
+		IdleFunc:            e.tundev.IdleDuration,
+		NoteRecvActivity:    e.noteRecvActivity,
+		NetMon:              e.netMon,
+		HealthTracker:       e.health,
+		UserMetricsRegistry: conf.UserMetricsRegistry,
+		ControlKnobs:        conf.ControlKnobs,
+		OnPortUpdate:        onPortUpdate,
+		PeerByKeyFunc:       e.PeerByKey,
 	}
 
 	var err error