Have lighthouses ack updates to reduce test packet traffic (#851)

cert/cert.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.29.0
-// 	protoc        v3.20.0
+// 	protoc-gen-go v1.30.0
+// 	protoc        v3.21.5
 // source: cert.proto
 
 package cert

connection_manager.go

@@ -368,12 +368,6 @@ func (n *connectionManager) makeTrafficDecision(localIndex uint32, p, nb, out []
 			n.sendPunch(hostinfo)
 		}
 
-		if n.intf.lightHouse.IsLighthouseIP(hostinfo.vpnIp) {
-			// We are sending traffic to the lighthouse, let recv_error sort out any issues instead of testing the tunnel
-			n.trafficTimer.Add(hostinfo.localIndexId, n.checkInterval)
-			return doNothing, nil, nil
-		}
-
 		if n.l.Level >= logrus.DebugLevel {
 			hostinfo.logger(n.l).
 				WithField("tunnelCheck", m{"state": "testing", "method": "active"}).

lighthouse.go

@@ -793,11 +793,14 @@ func (lhh *LightHouseHandler) HandleRequest(rAddr *udp.Addr, vpnIp iputil.VpnIp,
 		lhh.handleHostQueryReply(n, vpnIp)
 
 	case NebulaMeta_HostUpdateNotification:
-		lhh.handleHostUpdateNotification(n, vpnIp)
+		lhh.handleHostUpdateNotification(n, vpnIp, w)
 
 	case NebulaMeta_HostMovedNotification:
 	case NebulaMeta_HostPunchNotification:
 		lhh.handleHostPunchNotification(n, vpnIp, w)
+
+	case NebulaMeta_HostUpdateNotificationAck:
+		// noop
 	}
 }
 
@@ -906,7 +909,7 @@ func (lhh *LightHouseHandler) handleHostQueryReply(n *NebulaMeta, vpnIp iputil.V
 	}
 }
 
-func (lhh *LightHouseHandler) handleHostUpdateNotification(n *NebulaMeta, vpnIp iputil.VpnIp) {
+func (lhh *LightHouseHandler) handleHostUpdateNotification(n *NebulaMeta, vpnIp iputil.VpnIp, w EncWriter) {
 	if !lhh.lh.amLighthouse {
 		if lhh.l.Level >= logrus.DebugLevel {
 			lhh.l.Debugln("I am not a lighthouse, do not take host updates: ", vpnIp)
@@ -932,6 +935,19 @@ func (lhh *LightHouseHandler) handleHostUpdateNotification(n *NebulaMeta, vpnIp
 	am.unlockedSetV6(vpnIp, certVpnIp, n.Details.Ip6AndPorts, lhh.lh.unlockedShouldAddV6)
 	am.unlockedSetRelay(vpnIp, certVpnIp, n.Details.RelayVpnIp)
 	am.Unlock()
+
+	n = lhh.resetMeta()
+	n.Type = NebulaMeta_HostUpdateNotificationAck
+	n.Details.VpnIp = uint32(vpnIp)
+	ln, err := n.MarshalTo(lhh.pb)
+
+	if err != nil {
+		lhh.l.WithError(err).WithField("vpnIp", vpnIp).Error("Failed to marshal lighthouse host update ack")
+		return
+	}
+
+	lhh.lh.metricTx(NebulaMeta_HostUpdateNotificationAck, 1)
+	w.SendMessageToVpnIp(header.LightHouse, 0, vpnIp, lhh.pb[:ln], lhh.nb, lhh.out[:0])
 }
 
 func (lhh *LightHouseHandler) handleHostPunchNotification(n *NebulaMeta, vpnIp iputil.VpnIp, w EncWriter) {

message_metrics.go

@@ -84,6 +84,7 @@ func newLighthouseMetrics() *MessageMetrics {
 			NebulaMeta_HostQueryReply,
 			NebulaMeta_HostUpdateNotification,
 			NebulaMeta_HostPunchNotification,
+			NebulaMeta_HostUpdateNotificationAck,
 		}
 		for _, i := range used {
 			h[i] = []metrics.Counter{metrics.GetOrRegisterCounter(fmt.Sprintf("lighthouse.%s.%s", t, i.String()), nil)}

nebula.pb.go

@@ -25,42 +25,45 @@ const _ = proto.GoGoProtoPackageIsVersion3 // please upgrade the proto package
 type NebulaMeta_MessageType int32
 
 const (
-	NebulaMeta_None                   NebulaMeta_MessageType = 0
-	NebulaMeta_HostQuery              NebulaMeta_MessageType = 1
-	NebulaMeta_HostQueryReply         NebulaMeta_MessageType = 2
-	NebulaMeta_HostUpdateNotification NebulaMeta_MessageType = 3
-	NebulaMeta_HostMovedNotification  NebulaMeta_MessageType = 4
-	NebulaMeta_HostPunchNotification  NebulaMeta_MessageType = 5
-	NebulaMeta_HostWhoami             NebulaMeta_MessageType = 6
-	NebulaMeta_HostWhoamiReply        NebulaMeta_MessageType = 7
-	NebulaMeta_PathCheck              NebulaMeta_MessageType = 8
-	NebulaMeta_PathCheckReply         NebulaMeta_MessageType = 9
+	NebulaMeta_None                      NebulaMeta_MessageType = 0
+	NebulaMeta_HostQuery                 NebulaMeta_MessageType = 1
+	NebulaMeta_HostQueryReply            NebulaMeta_MessageType = 2
+	NebulaMeta_HostUpdateNotification    NebulaMeta_MessageType = 3
+	NebulaMeta_HostMovedNotification     NebulaMeta_MessageType = 4
+	NebulaMeta_HostPunchNotification     NebulaMeta_MessageType = 5
+	NebulaMeta_HostWhoami                NebulaMeta_MessageType = 6
+	NebulaMeta_HostWhoamiReply           NebulaMeta_MessageType = 7
+	NebulaMeta_PathCheck                 NebulaMeta_MessageType = 8
+	NebulaMeta_PathCheckReply            NebulaMeta_MessageType = 9
+	NebulaMeta_HostUpdateNotificationAck NebulaMeta_MessageType = 10
 )
 
 var NebulaMeta_MessageType_name = map[int32]string{
-	0: "None",
-	1: "HostQuery",
-	2: "HostQueryReply",
-	3: "HostUpdateNotification",
-	4: "HostMovedNotification",
-	5: "HostPunchNotification",
-	6: "HostWhoami",
-	7: "HostWhoamiReply",
-	8: "PathCheck",
-	9: "PathCheckReply",
+	0:  "None",
+	1:  "HostQuery",
+	2:  "HostQueryReply",
+	3:  "HostUpdateNotification",
+	4:  "HostMovedNotification",
+	5:  "HostPunchNotification",
+	6:  "HostWhoami",
+	7:  "HostWhoamiReply",
+	8:  "PathCheck",
+	9:  "PathCheckReply",
+	10: "HostUpdateNotificationAck",
 }
 
 var NebulaMeta_MessageType_value = map[string]int32{
-	"None":                   0,
-	"HostQuery":              1,
-	"HostQueryReply":         2,
-	"HostUpdateNotification": 3,
-	"HostMovedNotification":  4,
-	"HostPunchNotification":  5,
-	"HostWhoami":             6,
-	"HostWhoamiReply":        7,
-	"PathCheck":              8,
-	"PathCheckReply":         9,
+	"None":                      0,
+	"HostQuery":                 1,
+	"HostQueryReply":            2,
+	"HostUpdateNotification":    3,
+	"HostMovedNotification":     4,
+	"HostPunchNotification":     5,
+	"HostWhoami":                6,
+	"HostWhoamiReply":           7,
+	"PathCheck":                 8,
+	"PathCheckReply":            9,
+	"HostUpdateNotificationAck": 10,
 }
 
 func (x NebulaMeta_MessageType) String() string {
@@ -637,51 +640,52 @@ func init() {
 func init() { proto.RegisterFile("nebula.proto", fileDescriptor_2d65afa7693df5ef) }
 
 var fileDescriptor_2d65afa7693df5ef = []byte{
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+	0x95, 0xc7, 0xab, 0x99, 0x2c, 0x48, 0x1b, 0x1e, 0x66, 0x0f, 0x76, 0x62, 0xeb, 0x6a, 0xfe, 0xd2,
+	0xb7, 0xda, 0xd4, 0x92, 0x8a, 0xf8, 0x12, 0x29, 0x45, 0x74, 0xbf, 0x4d, 0x2d, 0xfc, 0x1f, 0x4a,
+	0x0a, 0x9d, 0xf3, 0xbe, 0xaf, 0xee, 0x59, 0x21, 0x49, 0x01, 0x9b, 0x50, 0x56, 0xe0, 0x55, 0xc0,
+	0xa7, 0xea, 0x5b, 0x90, 0xfd, 0x74, 0xc9, 0xee, 0xfd, 0xee, 0xcf, 0x55, 0x03, 0xec, 0x06, 0x8c,
+	0x0a, 0xa6, 0xd8, 0x84, 0x5d, 0xcd, 0x58, 0x28, 0x4c, 0x0d, 0xff, 0x85, 0x9d, 0x95, 0xba, 0xb4,
+	0x14, 0x32, 0x53, 0x7f, 0xb1, 0xff, 0xe5, 0xce, 0xd2, 0x6e, 0xef, 0x2c, 0xed, 0xfb, 0x9d, 0xa5,
+	0x7d, 0xbe, 0xb7, 0x32, 0xb7, 0xf7, 0x56, 0xe6, 0xdb, 0xbd, 0x95, 0x79, 0xdf, 0xb8, 0x74, 0xc5,
+	0x68, 0x76, 0xd1, 0x76, 0xf8, 0x74, 0x37, 0x9c, 0x50, 0x67, 0x3c, 0xba, 0xda, 0x8d, 0x22, 0xbc,
+	0xc8, 0xab, 0x1f, 0xf8, 0xfe, 0xaf, 0x00, 0x00, 0x00, 0xff, 0xff, 0x17, 0x56, 0x28, 0x74, 0xd0,
+	0x05, 0x00, 0x00,
 }
 
 func (m *NebulaMeta) Marshal() (dAtA []byte, err error) {

nebula.proto

@@ -15,6 +15,7 @@ message NebulaMeta {
     HostWhoamiReply = 7;
     PathCheck = 8;
     PathCheckReply = 9;
+    HostUpdateNotificationAck = 10;
   }
 
   MessageType Type = 1;