Merge remote-tracking branch 'origin/master' into multiport

.github/ISSUE_TEMPLATE/config.yml

@@ -1,9 +1,13 @@
 blank_issues_enabled: true
 contact_links:
   - name: 📘 Documentation
-    url: https://www.defined.net/nebula/
+    url: https://nebula.defined.net/docs/
     about: Review documentation.
 
   - name: 💁 Support/Chat
     url: https://join.slack.com/t/nebulaoss/shared_invite/enQtOTA5MDI4NDg3MTg4LTkwY2EwNTI4NzQyMzc0M2ZlODBjNWI3NTY1MzhiOThiMmZlZjVkMTI0NGY4YTMyNjUwMWEyNzNkZTJmYzQxOGU
     about: 'This issue tracker is not for support questions. Join us on Slack for assistance!'
+
+  - name: 📱 Mobile Nebula
+    url: https://github.com/definednet/mobile_nebula
+    about: 'This issue tracker is not for mobile support. Try the Mobile Nebula repo instead!'

.github/workflows/gofmt.yml

@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.18
+    - name: Set up Go 1.19
       uses: actions/setup-go@v2
       with:
-        go-version: 1.18
+        go-version: 1.19
       id: go
 
     - name: Check out code into the Go module directory
@@ -26,9 +26,9 @@ jobs:
     - uses: actions/cache@v2
       with:
         path: ~/go/pkg/mod
-        key: ${{ runner.os }}-gofmt1.18-${{ hashFiles('**/go.sum') }}
+        key: ${{ runner.os }}-gofmt1.19-${{ hashFiles('**/go.sum') }}
         restore-keys: |
-          ${{ runner.os }}-gofmt1.18-
+          ${{ runner.os }}-gofmt1.19-
 
     - name: Install goimports
       run: |

.github/workflows/release.yml

@@ -10,10 +10,10 @@ jobs:
     name: Build Linux All
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.18
+      - name: Set up Go 1.19
         uses: actions/setup-go@v2
         with:
-          go-version: 1.18
+          go-version: 1.19
 
       - name: Checkout code
         uses: actions/checkout@v2
@@ -34,10 +34,10 @@ jobs:
     name: Build Windows
     runs-on: windows-latest
     steps:
-      - name: Set up Go 1.18
+      - name: Set up Go 1.19
         uses: actions/setup-go@v2
         with:
-          go-version: 1.18
+          go-version: 1.19
 
       - name: Checkout code
         uses: actions/checkout@v2
@@ -68,10 +68,10 @@ jobs:
       HAS_SIGNING_CREDS: ${{ secrets.AC_USERNAME != '' }}
     runs-on: macos-11
     steps:
-      - name: Set up Go 1.18
+      - name: Set up Go 1.19
         uses: actions/setup-go@v2
         with:
-          go-version: 1.18
+          go-version: 1.19
 
       - name: Checkout code
         uses: actions/checkout@v2

.github/workflows/smoke.yml

@@ -18,10 +18,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.18
+    - name: Set up Go 1.19
       uses: actions/setup-go@v2
       with:
-        go-version: 1.18
+        go-version: 1.19
       id: go
 
     - name: Check out code into the Go module directory
@@ -30,9 +30,9 @@ jobs:
     - uses: actions/cache@v2
       with:
         path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go1.18-${{ hashFiles('**/go.sum') }}
+        key: ${{ runner.os }}-go1.19-${{ hashFiles('**/go.sum') }}
         restore-keys: |
-          ${{ runner.os }}-go1.18-
+          ${{ runner.os }}-go1.19-
 
     - name: build
       run: make bin-docker

.github/workflows/test.yml

@@ -18,10 +18,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.18
+    - name: Set up Go 1.19
       uses: actions/setup-go@v2
       with:
-        go-version: 1.18
+        go-version: 1.19
       id: go
 
     - name: Check out code into the Go module directory
@@ -30,9 +30,9 @@ jobs:
     - uses: actions/cache@v2
       with:
         path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go1.18-${{ hashFiles('**/go.sum') }}
+        key: ${{ runner.os }}-go1.19-${{ hashFiles('**/go.sum') }}
         restore-keys: |
-          ${{ runner.os }}-go1.18-
+          ${{ runner.os }}-go1.19-
 
     - name: Build
       run: make all
@@ -57,10 +57,10 @@ jobs:
         os: [windows-latest, macos-11]
     steps:
 
-    - name: Set up Go 1.18
+    - name: Set up Go 1.19
       uses: actions/setup-go@v2
       with:
-        go-version: 1.18
+        go-version: 1.19
       id: go
 
     - name: Check out code into the Go module directory
@@ -69,9 +69,9 @@ jobs:
     - uses: actions/cache@v2
       with:
         path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go1.18-${{ hashFiles('**/go.sum') }}
+        key: ${{ runner.os }}-go1.19-${{ hashFiles('**/go.sum') }}
         restore-keys: |
-          ${{ runner.os }}-go1.18-
+          ${{ runner.os }}-go1.19-
 
     - name: Build nebula
       run: go build ./cmd/nebula

.gitignore

@@ -4,10 +4,14 @@
 /nebula-arm6
 /nebula-darwin
 /nebula.exe
-/cert/*.crt
-/cert/*.key
+/nebula-cert.exe
 /coverage.out
 /cpu.pprof
 /build
 /*.tar.gz
 /e2e/mermaid/
+**.crt
+**.key
+**.pem
+!/examples/quickstart-vagrant/ansible/roles/nebula/files/vagrant-test-ca.key
+!/examples/quickstart-vagrant/ansible/roles/nebula/files/vagrant-test-ca.crt

Makefile

@@ -1,4 +1,4 @@
-GOMINVERSION = 1.18
+GOMINVERSION = 1.19
 NEBULA_CMD_PATH = "./cmd/nebula"
 GO111MODULE = on
 export GO111MODULE

README.md

@@ -8,7 +8,7 @@ and tunneling, and each of those individual pieces existed before Nebula in vari
 What makes Nebula different to existing offerings is that it brings all of these ideas together,
 resulting in a sum that is greater than its individual parts.
 
-Further documentation can be found [here](https://www.defined.net/nebula/).
+Further documentation can be found [here](https://nebula.defined.net/docs/).
 
 You can read more about Nebula [here](https://medium.com/p/884110a5579).
 
@@ -31,12 +31,16 @@ Check the [releases](https://github.com/slackhq/nebula/releases/latest) page for
     ```
     $ sudo pacman -S nebula
     ```
-- [Fedora Linux](https://copr.fedorainfracloud.org/coprs/jdoss/nebula/)
+- [Fedora Linux](https://src.fedoraproject.org/rpms/nebula)
     ```
-    $ sudo dnf copr enable jdoss/nebula
     $ sudo dnf install nebula
     ```
 
+- [macOS Homebrew](https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/nebula.rb)
+    ```
+    $ brew install nebula
+    ```
+
 #### Mobile
 
 - [iOS](https://apps.apple.com/us/app/mobile-nebula/id1509587936?itsct=apps_box&itscg=30200)
@@ -93,13 +97,13 @@ Download a copy of the nebula [example configuration](https://github.com/slackhq
 
 #### 6. Copy nebula credentials, configuration, and binaries to each host
 
-For each host, copy the nebula binary to the host, along with `config.yaml` from step 5, and the files `ca.crt`, `{host}.crt`, and `{host}.key` from step 4.
+For each host, copy the nebula binary to the host, along with `config.yml` from step 5, and the files `ca.crt`, `{host}.crt`, and `{host}.key` from step 4.
 
 **DO NOT COPY `ca.key` TO INDIVIDUAL NODES.**
 
 #### 7. Run nebula on each host
 ```
-./nebula -config /path/to/config.yaml
+./nebula -config /path/to/config.yml
 ```
 
 ## Building Nebula from source

cmd/nebula-cert/main.go

@@ -127,6 +127,8 @@ func help(err string, out io.Writer) {
 	fmt.Fprintln(out, "    "+signSummary())
 	fmt.Fprintln(out, "    "+printSummary())
 	fmt.Fprintln(out, "    "+verifySummary())
+	fmt.Fprintln(out, "")
+	fmt.Fprintf(out, "  To see usage for a given mode, use %s <mode> -h\n", os.Args[0])
 }
 
 func mustFlagString(name string, val *string) error {

cmd/nebula-cert/main_test.go

@@ -22,7 +22,9 @@ func Test_help(t *testing.T) {
 		"    " + keygenSummary() + "\n" +
 		"    " + signSummary() + "\n" +
 		"    " + printSummary() + "\n" +
-		"    " + verifySummary() + "\n"
+		"    " + verifySummary() + "\n" +
+		"\n" +
+		"  To see usage for a given mode, use " + os.Args[0] + " <mode> -h\n"
 
 	ob := &bytes.Buffer{}
 

cmd/nebula-service/main.go

@@ -13,7 +13,7 @@ import (
 
 // A version string that can be set with
 //
-//     -ldflags "-X main.Build=SOMEVERSION"
+//	-ldflags "-X main.Build=SOMEVERSION"
 //
 // at compile-time.
 var Build string

cmd/nebula-service/service.go

@@ -49,6 +49,14 @@ func (p *program) Stop(s service.Service) error {
 	return nil
 }
 
+func fileExists(filename string) bool {
+	_, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return true
+}
+
 func doService(configPath *string, configTest *bool, build string, serviceFlag *string) {
 	if *configPath == "" {
 		ex, err := os.Executable()
@@ -56,6 +64,9 @@ func doService(configPath *string, configTest *bool, build string, serviceFlag *
 			panic(err)
 		}
 		*configPath = filepath.Dir(ex) + "/config.yaml"
+		if !fileExists(*configPath) {
+			*configPath = filepath.Dir(ex) + "/config.yml"
+		}
 	}
 
 	svcConfig := &service.Config{

cmd/nebula/main.go

@@ -13,7 +13,7 @@ import (
 
 // A version string that can be set with
 //
-//     -ldflags "-X main.Build=SOMEVERSION"
+//	-ldflags "-X main.Build=SOMEVERSION"
 //
 // at compile-time.
 var Build string

config/config_test.go

@@ -7,8 +7,11 @@ import (
 	"testing"
 	"time"
 
+	"github.com/imdario/mergo"
 	"github.com/slackhq/nebula/test"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gopkg.in/yaml.v2"
 )
 
 func TestConfig_Load(t *testing.T) {
@@ -147,3 +150,77 @@ func TestConfig_ReloadConfig(t *testing.T) {
 	}
 
 }
+
+// Ensure mergo merges are done the way we expect.
+// This is needed to test for potential regressions, like:
+// - https://github.com/imdario/mergo/issues/187
+func TestConfig_MergoMerge(t *testing.T) {
+	configs := [][]byte{
+		[]byte(`
+listen:
+  port: 1234
+`),
+		[]byte(`
+firewall:
+  inbound:
+    - port: 443
+      proto: tcp
+      groups:
+        - server
+    - port: 443
+      proto: tcp
+      groups:
+        - webapp
+`),
+		[]byte(`
+listen:
+  host: 0.0.0.0
+  port: 4242
+firewall:
+  outbound:
+    - port: any
+      proto: any
+      host: any
+  inbound:
+    - port: any
+      proto: icmp
+      host: any
+`),
+	}
+
+	var m map[any]any
+
+	// merge the same way config.parse() merges
+	for _, b := range configs {
+		var nm map[any]any
+		err := yaml.Unmarshal(b, &nm)
+		require.NoError(t, err)
+
+		// We need to use WithAppendSlice so that firewall rules in separate
+		// files are appended together
+		err = mergo.Merge(&nm, m, mergo.WithAppendSlice)
+		m = nm
+		require.NoError(t, err)
+	}
+
+	t.Logf("Merged Config: %#v", m)
+	mYaml, err := yaml.Marshal(m)
+	require.NoError(t, err)
+	t.Logf("Merged Config as YAML:\n%s", mYaml)
+
+	// If a bug is present, some items might be replaced instead of merged like we expect
+	expected := map[any]any{
+		"firewall": map[any]any{
+			"inbound": []any{
+				map[any]any{"host": "any", "port": "any", "proto": "icmp"},
+				map[any]any{"groups": []any{"server"}, "port": 443, "proto": "tcp"},
+				map[any]any{"groups": []any{"webapp"}, "port": 443, "proto": "tcp"}},
+			"outbound": []any{
+				map[any]any{"host": "any", "port": "any", "proto": "any"}}},
+		"listen": map[any]any{
+			"host": "0.0.0.0",
+			"port": 4242,
+		},
+	}
+	assert.Equal(t, expected, m)
+}

connection_manager.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/sirupsen/logrus"
 	"github.com/slackhq/nebula/header"
-	"github.com/slackhq/nebula/iputil"
 )
 
 // TODO: incount and outcount are intended as a shortcut to locking the mutexes for every single packet
@@ -15,18 +14,16 @@ import (
 
 type connectionManager struct {
 	hostMap      *HostMap
-	in           map[iputil.VpnIp]struct{}
+	in           map[uint32]struct{}
 	inLock       *sync.RWMutex
-	inCount      int
-	out          map[iputil.VpnIp]struct{}
+	out          map[uint32]struct{}
 	outLock      *sync.RWMutex
-	outCount     int
-	TrafficTimer *SystemTimerWheel
+	TrafficTimer *LockingTimerWheel[uint32]
 	intf         *Interface
 
-	pendingDeletion      map[iputil.VpnIp]int
+	pendingDeletion      map[uint32]int
 	pendingDeletionLock  *sync.RWMutex
-	pendingDeletionTimer *SystemTimerWheel
+	pendingDeletionTimer *LockingTimerWheel[uint32]
 
 	checkInterval           int
 	pendingDeletionInterval int
@@ -38,17 +35,15 @@ type connectionManager struct {
 func newConnectionManager(ctx context.Context, l *logrus.Logger, intf *Interface, checkInterval, pendingDeletionInterval int) *connectionManager {
 	nc := &connectionManager{
 		hostMap:                 intf.hostMap,
-		in:                      make(map[iputil.VpnIp]struct{}),
+		in:                      make(map[uint32]struct{}),
 		inLock:                  &sync.RWMutex{},
-		inCount:                 0,
-		out:                     make(map[iputil.VpnIp]struct{}),
+		out:                     make(map[uint32]struct{}),
 		outLock:                 &sync.RWMutex{},
-		outCount:                0,
-		TrafficTimer:            NewSystemTimerWheel(time.Millisecond*500, time.Second*60),
+		TrafficTimer:            NewLockingTimerWheel[uint32](time.Millisecond*500, time.Second*60),
 		intf:                    intf,
-		pendingDeletion:         make(map[iputil.VpnIp]int),
+		pendingDeletion:         make(map[uint32]int),
 		pendingDeletionLock:     &sync.RWMutex{},
-		pendingDeletionTimer:    NewSystemTimerWheel(time.Millisecond*500, time.Second*60),
+		pendingDeletionTimer:    NewLockingTimerWheel[uint32](time.Millisecond*500, time.Second*60),
 		checkInterval:           checkInterval,
 		pendingDeletionInterval: pendingDeletionInterval,
 		l:                       l,
@@ -57,41 +52,41 @@ func newConnectionManager(ctx context.Context, l *logrus.Logger, intf *Interface
 	return nc
 }
 
-func (n *connectionManager) In(ip iputil.VpnIp) {
+func (n *connectionManager) In(localIndex uint32) {
 	n.inLock.RLock()
 	// If this already exists, return
-	if _, ok := n.in[ip]; ok {
+	if _, ok := n.in[localIndex]; ok {
 		n.inLock.RUnlock()
 		return
 	}
 	n.inLock.RUnlock()
 	n.inLock.Lock()
-	n.in[ip] = struct{}{}
+	n.in[localIndex] = struct{}{}
 	n.inLock.Unlock()
 }
 
-func (n *connectionManager) Out(ip iputil.VpnIp) {
+func (n *connectionManager) Out(localIndex uint32) {
 	n.outLock.RLock()
 	// If this already exists, return
-	if _, ok := n.out[ip]; ok {
+	if _, ok := n.out[localIndex]; ok {
 		n.outLock.RUnlock()
 		return
 	}
 	n.outLock.RUnlock()
 	n.outLock.Lock()
 	// double check since we dropped the lock temporarily
-	if _, ok := n.out[ip]; ok {
+	if _, ok := n.out[localIndex]; ok {
 		n.outLock.Unlock()
 		return
 	}
-	n.out[ip] = struct{}{}
-	n.AddTrafficWatch(ip, n.checkInterval)
+	n.out[localIndex] = struct{}{}
+	n.AddTrafficWatch(localIndex, n.checkInterval)
 	n.outLock.Unlock()
 }
 
-func (n *connectionManager) CheckIn(vpnIp iputil.VpnIp) bool {
+func (n *connectionManager) CheckIn(localIndex uint32) bool {
 	n.inLock.RLock()
-	if _, ok := n.in[vpnIp]; ok {
+	if _, ok := n.in[localIndex]; ok {
 		n.inLock.RUnlock()
 		return true
 	}
@@ -99,35 +94,35 @@ func (n *connectionManager) CheckIn(vpnIp iputil.VpnIp) bool {
 	return false
 }
 
-func (n *connectionManager) ClearIP(ip iputil.VpnIp) {
+func (n *connectionManager) ClearLocalIndex(localIndex uint32) {
 	n.inLock.Lock()
 	n.outLock.Lock()
-	delete(n.in, ip)
-	delete(n.out, ip)
+	delete(n.in, localIndex)
+	delete(n.out, localIndex)
 	n.inLock.Unlock()
 	n.outLock.Unlock()
 }
 
-func (n *connectionManager) ClearPendingDeletion(ip iputil.VpnIp) {
+func (n *connectionManager) ClearPendingDeletion(localIndex uint32) {
 	n.pendingDeletionLock.Lock()
-	delete(n.pendingDeletion, ip)
+	delete(n.pendingDeletion, localIndex)
 	n.pendingDeletionLock.Unlock()
 }
 
-func (n *connectionManager) AddPendingDeletion(ip iputil.VpnIp) {
+func (n *connectionManager) AddPendingDeletion(localIndex uint32) {
 	n.pendingDeletionLock.Lock()
-	if _, ok := n.pendingDeletion[ip]; ok {
-		n.pendingDeletion[ip] += 1
+	if _, ok := n.pendingDeletion[localIndex]; ok {
+		n.pendingDeletion[localIndex] += 1
 	} else {
-		n.pendingDeletion[ip] = 0
+		n.pendingDeletion[localIndex] = 0
 	}
-	n.pendingDeletionTimer.Add(ip, time.Second*time.Duration(n.pendingDeletionInterval))
+	n.pendingDeletionTimer.Add(localIndex, time.Second*time.Duration(n.pendingDeletionInterval))
 	n.pendingDeletionLock.Unlock()
 }
 
-func (n *connectionManager) checkPendingDeletion(ip iputil.VpnIp) bool {
+func (n *connectionManager) checkPendingDeletion(localIndex uint32) bool {
 	n.pendingDeletionLock.RLock()
-	if _, ok := n.pendingDeletion[ip]; ok {
+	if _, ok := n.pendingDeletion[localIndex]; ok {
 
 		n.pendingDeletionLock.RUnlock()
 		return true
@@ -136,8 +131,8 @@ func (n *connectionManager) checkPendingDeletion(ip iputil.VpnIp) bool {
 	return false
 }
 
-func (n *connectionManager) AddTrafficWatch(vpnIp iputil.VpnIp, seconds int) {
-	n.TrafficTimer.Add(vpnIp, time.Second*time.Duration(seconds))
+func (n *connectionManager) AddTrafficWatch(localIndex uint32, seconds int) {
+	n.TrafficTimer.Add(localIndex, time.Second*time.Duration(seconds))
 }
 
 func (n *connectionManager) Start(ctx context.Context) {
@@ -164,40 +159,60 @@ func (n *connectionManager) Run(ctx context.Context) {
 }
 
 func (n *connectionManager) HandleMonitorTick(now time.Time, p, nb, out []byte) {
-	n.TrafficTimer.advance(now)
+	n.TrafficTimer.Advance(now)
 	for {
-		ep := n.TrafficTimer.Purge()
-		if ep == nil {
+		localIndex, has := n.TrafficTimer.Purge()
+		if !has {
 			break
 		}
 
-		vpnIp := ep.(iputil.VpnIp)
-
 		// Check for traffic coming back in from this host.
-		traf := n.CheckIn(vpnIp)
+		traf := n.CheckIn(localIndex)
 
-		hostinfo, err := n.hostMap.QueryVpnIp(vpnIp)
+		hostinfo, err := n.hostMap.QueryIndex(localIndex)
 		if err != nil {
-			n.l.Debugf("Not found in hostmap: %s", vpnIp)
-			n.ClearIP(vpnIp)
-			n.ClearPendingDeletion(vpnIp)
+			n.l.WithField("localIndex", localIndex).Debugf("Not found in hostmap")
+			n.ClearLocalIndex(localIndex)
+			n.ClearPendingDeletion(localIndex)
 			continue
 		}
 
-		if n.handleInvalidCertificate(now, vpnIp, hostinfo) {
+		if n.handleInvalidCertificate(now, hostinfo) {
 			continue
 		}
 
+		// Does the vpnIp point to this hostinfo or is it ancillary? If we have ancillary hostinfos then we need to
+		// decide if this should be the main hostinfo if we are seeing traffic on it
+		primary, _ := n.hostMap.QueryVpnIp(hostinfo.vpnIp)
+		mainHostInfo := true
+		if primary != nil && primary != hostinfo {
+			mainHostInfo = false
+		}
+
 		// If we saw an incoming packets from this ip and peer's certificate is not
 		// expired, just ignore.
 		if traf {
 			if n.l.Level >= logrus.DebugLevel {
-				n.l.WithField("vpnIp", vpnIp).
+				hostinfo.logger(n.l).
 					WithField("tunnelCheck", m{"state": "alive", "method": "passive"}).
 					Debug("Tunnel status")
 			}
-			n.ClearIP(vpnIp)
-			n.ClearPendingDeletion(vpnIp)
+			n.ClearLocalIndex(localIndex)
+			n.ClearPendingDeletion(localIndex)
+
+			if !mainHostInfo {
+				if hostinfo.vpnIp > n.intf.myVpnIp {
+					// We are receiving traffic on the non primary hostinfo and we really just want 1 tunnel. Make
+					// This the primary and prime the old primary hostinfo for testing
+					n.hostMap.MakePrimary(hostinfo)
+					n.Out(primary.localIndexId)
+				} else {
+					// This hostinfo is still being used despite not being the primary hostinfo for this vpn ip
+					// Keep tracking so that we can tear it down when it goes away
+					n.Out(hostinfo.localIndexId)
+				}
+			}
+
 			continue
 		}
 
@@ -205,80 +220,73 @@ func (n *connectionManager) HandleMonitorTick(now time.Time, p, nb, out []byte)
 			WithField("tunnelCheck", m{"state": "testing", "method": "active"}).
 			Debug("Tunnel status")
 
-		if hostinfo != nil && hostinfo.ConnectionState != nil {
+		if hostinfo != nil && hostinfo.ConnectionState != nil && mainHostInfo {
 			// Send a test packet to trigger an authenticated tunnel test, this should suss out any lingering tunnel issues
-			n.intf.SendMessageToVpnIp(header.Test, header.TestRequest, vpnIp, p, nb, out)
+			n.intf.sendMessageToVpnIp(header.Test, header.TestRequest, hostinfo, p, nb, out)
 
 		} else {
-			hostinfo.logger(n.l).Debugf("Hostinfo sadness: %s", vpnIp)
+			hostinfo.logger(n.l).Debugf("Hostinfo sadness")
 		}
-		n.AddPendingDeletion(vpnIp)
+		n.AddPendingDeletion(localIndex)
 	}
 
 }
 
 func (n *connectionManager) HandleDeletionTick(now time.Time) {
-	n.pendingDeletionTimer.advance(now)
+	n.pendingDeletionTimer.Advance(now)
 	for {
-		ep := n.pendingDeletionTimer.Purge()
-		if ep == nil {
+		localIndex, has := n.pendingDeletionTimer.Purge()
+		if !has {
 			break
 		}
 
-		vpnIp := ep.(iputil.VpnIp)
-
-		hostinfo, err := n.hostMap.QueryVpnIp(vpnIp)
+		hostinfo, err := n.hostMap.QueryIndex(localIndex)
 		if err != nil {
-			n.l.Debugf("Not found in hostmap: %s", vpnIp)
-			n.ClearIP(vpnIp)
-			n.ClearPendingDeletion(vpnIp)
+			n.l.WithField("localIndex", localIndex).Debugf("Not found in hostmap")
+			n.ClearLocalIndex(localIndex)
+			n.ClearPendingDeletion(localIndex)
 			continue
 		}
 
-		if n.handleInvalidCertificate(now, vpnIp, hostinfo) {
+		if n.handleInvalidCertificate(now, hostinfo) {
 			continue
 		}
 
 		// If we saw an incoming packets from this ip and peer's certificate is not
 		// expired, just ignore.
-		traf := n.CheckIn(vpnIp)
+		traf := n.CheckIn(localIndex)
 		if traf {
-			n.l.WithField("vpnIp", vpnIp).
+			hostinfo.logger(n.l).
 				WithField("tunnelCheck", m{"state": "alive", "method": "active"}).
 				Debug("Tunnel status")
 
-			n.ClearIP(vpnIp)
-			n.ClearPendingDeletion(vpnIp)
+			n.ClearLocalIndex(localIndex)
+			n.ClearPendingDeletion(localIndex)
 			continue
 		}
 
 		// If it comes around on deletion wheel and hasn't resolved itself, delete
-		if n.checkPendingDeletion(vpnIp) {
+		if n.checkPendingDeletion(localIndex) {
 			cn := ""
 			if hostinfo.ConnectionState != nil && hostinfo.ConnectionState.peerCert != nil {
 				cn = hostinfo.ConnectionState.peerCert.Details.Name
 			}
+
 			hostinfo.logger(n.l).
 				WithField("tunnelCheck", m{"state": "dead", "method": "active"}).
 				WithField("certName", cn).
 				Info("Tunnel status")
 
-			n.ClearIP(vpnIp)
-			n.ClearPendingDeletion(vpnIp)
-			// TODO: This is only here to let tests work. Should do proper mocking
-			if n.intf.lightHouse != nil {
-				n.intf.lightHouse.DeleteVpnIp(vpnIp)
-			}
 			n.hostMap.DeleteHostInfo(hostinfo)
-		} else {
-			n.ClearIP(vpnIp)
-			n.ClearPendingDeletion(vpnIp)
 		}
+
+		n.ClearLocalIndex(localIndex)
+		n.ClearPendingDeletion(localIndex)
 	}
 }
 
 // handleInvalidCertificates will destroy a tunnel if pki.disconnect_invalid is true and the certificate is no longer valid
-func (n *connectionManager) handleInvalidCertificate(now time.Time, vpnIp iputil.VpnIp, hostinfo *HostInfo) bool {
+func (n *connectionManager) handleInvalidCertificate(now time.Time, hostinfo *HostInfo) bool {
 	if !n.intf.disconnectInvalid {
 		return false
 	}
@@ -294,8 +302,7 @@ func (n *connectionManager) handleInvalidCertificate(now time.Time, vpnIp iputil
 	}
 
 	fingerprint, _ := remoteCert.Sha256Sum()
-	n.l.WithField("vpnIp", vpnIp).WithError(err).
-		WithField("certName", remoteCert.Details.Name).
+	hostinfo.logger(n.l).WithError(err).
 		WithField("fingerprint", fingerprint).
 		Info("Remote certificate is no longer valid, tearing down the tunnel")
 
@@ -303,7 +310,7 @@ func (n *connectionManager) handleInvalidCertificate(now time.Time, vpnIp iputil
 	n.intf.sendCloseTunnel(hostinfo)
 	n.intf.closeTunnel(hostinfo)
 
-	n.ClearIP(vpnIp)
-	n.ClearPendingDeletion(vpnIp)
+	n.ClearLocalIndex(hostinfo.localIndexId)
+	n.ClearPendingDeletion(hostinfo.localIndexId)
 	return true
 }

connection_manager_test.go

@@ -18,6 +18,20 @@ import (
 
 var vpnIp iputil.VpnIp
 
+func newTestLighthouse() *LightHouse {
+	lh := &LightHouse{
+		l:       test.NewLogger(),
+		addrMap: map[iputil.VpnIp]*RemoteList{},
+	}
+	lighthouses := map[iputil.VpnIp]struct{}{}
+	staticList := map[iputil.VpnIp]struct{}{}
+
+	lh.lighthouses.Store(&lighthouses)
+	lh.staticList.Store(&staticList)
+
+	return lh
+}
+
 func Test_NewConnectionManagerTest(t *testing.T) {
 	l := test.NewLogger()
 	//_, tuncidr, _ := net.ParseCIDR("1.1.1.1/24")
@@ -35,7 +49,7 @@ func Test_NewConnectionManagerTest(t *testing.T) {
 		rawCertificateNoKey: []byte{},
 	}
 
-	lh := &LightHouse{l: l, atomicStaticList: make(map[iputil.VpnIp]struct{}), atomicLighthouses: make(map[iputil.VpnIp]struct{})}
+	lh := newTestLighthouse()
 	ifce := &Interface{
 		hostMap:          hostMap,
 		inside:           &test.NoopTun{},
@@ -57,16 +71,22 @@ func Test_NewConnectionManagerTest(t *testing.T) {
 	out := make([]byte, mtu)
 	nc.HandleMonitorTick(now, p, nb, out)
 	// Add an ip we have established a connection w/ to hostmap
-	hostinfo, _ := nc.hostMap.AddVpnIp(vpnIp, nil)
+	hostinfo := &HostInfo{
+		vpnIp:         vpnIp,
+		localIndexId:  1099,
+		remoteIndexId: 9901,
+	}
 	hostinfo.ConnectionState = &ConnectionState{
 		certState: cs,
 		H:         &noise.HandshakeState{},
 	}
+	nc.hostMap.unlockedAddHostInfo(hostinfo, ifce)
 
 	// We saw traffic out to vpnIp
-	nc.Out(vpnIp)
-	assert.NotContains(t, nc.pendingDeletion, vpnIp)
-	assert.Contains(t, nc.hostMap.Hosts, vpnIp)
+	nc.Out(hostinfo.localIndexId)
+	assert.NotContains(t, nc.pendingDeletion, hostinfo.localIndexId)
+	assert.Contains(t, nc.hostMap.Hosts, hostinfo.vpnIp)
+	assert.Contains(t, nc.hostMap.Indexes, hostinfo.localIndexId)
 	// Move ahead 5s. Nothing should happen
 	next_tick := now.Add(5 * time.Second)
 	nc.HandleMonitorTick(next_tick, p, nb, out)
@@ -76,16 +96,17 @@ func Test_NewConnectionManagerTest(t *testing.T) {
 	nc.HandleMonitorTick(next_tick, p, nb, out)
 	nc.HandleDeletionTick(next_tick)
 	// This host should now be up for deletion
-	assert.Contains(t, nc.pendingDeletion, vpnIp)
-	assert.Contains(t, nc.hostMap.Hosts, vpnIp)
+	assert.Contains(t, nc.pendingDeletion, hostinfo.localIndexId)
+	assert.Contains(t, nc.hostMap.Hosts, hostinfo.vpnIp)
+	assert.Contains(t, nc.hostMap.Indexes, hostinfo.localIndexId)
 	// Move ahead some more
 	next_tick = now.Add(45 * time.Second)
 	nc.HandleMonitorTick(next_tick, p, nb, out)
 	nc.HandleDeletionTick(next_tick)
 	// The host should be evicted
-	assert.NotContains(t, nc.pendingDeletion, vpnIp)
-	assert.NotContains(t, nc.hostMap.Hosts, vpnIp)
-
+	assert.NotContains(t, nc.pendingDeletion, hostinfo.localIndexId)
+	assert.NotContains(t, nc.hostMap.Hosts, hostinfo.vpnIp)
+	assert.NotContains(t, nc.hostMap.Indexes, hostinfo.localIndexId)
 }
 
 func Test_NewConnectionManagerTest2(t *testing.T) {
@@ -104,7 +125,7 @@ func Test_NewConnectionManagerTest2(t *testing.T) {
 		rawCertificateNoKey: []byte{},
 	}
 
-	lh := &LightHouse{l: l, atomicStaticList: make(map[iputil.VpnIp]struct{}), atomicLighthouses: make(map[iputil.VpnIp]struct{})}
+	lh := newTestLighthouse()
 	ifce := &Interface{
 		hostMap:          hostMap,
 		inside:           &test.NoopTun{},
@@ -126,14 +147,19 @@ func Test_NewConnectionManagerTest2(t *testing.T) {
 	out := make([]byte, mtu)
 	nc.HandleMonitorTick(now, p, nb, out)
 	// Add an ip we have established a connection w/ to hostmap
-	hostinfo, _ := nc.hostMap.AddVpnIp(vpnIp, nil)
+	hostinfo := &HostInfo{
+		vpnIp:         vpnIp,
+		localIndexId:  1099,
+		remoteIndexId: 9901,
+	}
 	hostinfo.ConnectionState = &ConnectionState{
 		certState: cs,
 		H:         &noise.HandshakeState{},
 	}
+	nc.hostMap.unlockedAddHostInfo(hostinfo, ifce)
 
 	// We saw traffic out to vpnIp
-	nc.Out(vpnIp)
+	nc.Out(hostinfo.localIndexId)
 	assert.NotContains(t, nc.pendingDeletion, vpnIp)
 	assert.Contains(t, nc.hostMap.Hosts, vpnIp)
 	// Move ahead 5s. Nothing should happen
@@ -145,18 +171,19 @@ func Test_NewConnectionManagerTest2(t *testing.T) {
 	nc.HandleMonitorTick(next_tick, p, nb, out)
 	nc.HandleDeletionTick(next_tick)
 	// This host should now be up for deletion
-	assert.Contains(t, nc.pendingDeletion, vpnIp)
+	assert.Contains(t, nc.pendingDeletion, hostinfo.localIndexId)
 	assert.Contains(t, nc.hostMap.Hosts, vpnIp)
+	assert.Contains(t, nc.hostMap.Indexes, hostinfo.localIndexId)
 	// We heard back this time
-	nc.In(vpnIp)
+	nc.In(hostinfo.localIndexId)
 	// Move ahead some more
 	next_tick = now.Add(45 * time.Second)
 	nc.HandleMonitorTick(next_tick, p, nb, out)
 	nc.HandleDeletionTick(next_tick)
-	// The host should be evicted
-	assert.NotContains(t, nc.pendingDeletion, vpnIp)
-	assert.Contains(t, nc.hostMap.Hosts, vpnIp)
-
+	// The host should not be evicted
+	assert.NotContains(t, nc.pendingDeletion, hostinfo.localIndexId)
+	assert.Contains(t, nc.hostMap.Hosts, hostinfo.vpnIp)
+	assert.Contains(t, nc.hostMap.Indexes, hostinfo.localIndexId)
 }
 
 // Check if we can disconnect the peer.
@@ -213,7 +240,7 @@ func Test_NewConnectionManagerTest_DisconnectInvalid(t *testing.T) {
 		rawCertificateNoKey: []byte{},
 	}
 
-	lh := &LightHouse{l: l, atomicStaticList: make(map[iputil.VpnIp]struct{}), atomicLighthouses: make(map[iputil.VpnIp]struct{})}
+	lh := newTestLighthouse()
 	ifce := &Interface{
 		hostMap:           hostMap,
 		inside:            &test.NoopTun{},
@@ -243,13 +270,13 @@ func Test_NewConnectionManagerTest_DisconnectInvalid(t *testing.T) {
 	// Check if to disconnect with invalid certificate.
 	// Should be alive.
 	nextTick := now.Add(45 * time.Second)
-	destroyed := nc.handleInvalidCertificate(nextTick, vpnIp, hostinfo)
+	destroyed := nc.handleInvalidCertificate(nextTick, hostinfo)
 	assert.False(t, destroyed)
 
 	// Move ahead 61s.
 	// Check if to disconnect with invalid certificate.
 	// Should be disconnected.
 	nextTick = now.Add(61 * time.Second)
-	destroyed = nc.handleInvalidCertificate(nextTick, vpnIp, hostinfo)
+	destroyed = nc.handleInvalidCertificate(nextTick, hostinfo)
 	assert.True(t, destroyed)
 }

connection_state.go

@@ -14,17 +14,17 @@ import (
 const ReplayWindow = 1024
 
 type ConnectionState struct {
-	eKey                 *NebulaCipherState
-	dKey                 *NebulaCipherState
-	H                    *noise.HandshakeState
-	certState            *CertState
-	peerCert             *cert.NebulaCertificate
-	initiator            bool
-	atomicMessageCounter uint64
-	window               *Bits
-	queueLock            sync.Mutex
-	writeLock            sync.Mutex
-	ready                bool
+	eKey           *NebulaCipherState
+	dKey           *NebulaCipherState
+	H              *noise.HandshakeState
+	certState      *CertState
+	peerCert       *cert.NebulaCertificate
+	initiator      bool
+	messageCounter atomic.Uint64
+	window         *Bits
+	queueLock      sync.Mutex
+	writeLock      sync.Mutex
+	ready          bool
 }
 
 func (f *Interface) newConnectionState(l *logrus.Logger, initiator bool, pattern noise.HandshakePattern, psk []byte, pskStage int) *ConnectionState {
@@ -70,7 +70,7 @@ func (cs *ConnectionState) MarshalJSON() ([]byte, error) {
 	return json.Marshal(m{
 		"certificate":     cs.peerCert,
 		"initiator":       cs.initiator,
-		"message_counter": atomic.LoadUint64(&cs.atomicMessageCounter),
+		"message_counter": cs.messageCounter.Load(),
 		"ready":           cs.ready,
 	})
 }

control.go

@@ -5,7 +5,6 @@ import (
 	"net"
 	"os"
 	"os/signal"
-	"sync/atomic"
 	"syscall"
 
 	"github.com/sirupsen/logrus"
@@ -62,7 +61,7 @@ func (c *Control) Start() {
 
 // Stop signals nebula to shutdown, returns after the shutdown is complete
 func (c *Control) Stop() {
-	// Stop the handshakeManager (and other serivces), to prevent new tunnels from
+	// Stop the handshakeManager (and other services), to prevent new tunnels from
 	// being created while we're shutting them all down.
 	c.cancel()
 
@@ -96,12 +95,21 @@ func (c *Control) RebindUDPServer() {
 	c.f.rebindCount++
 }
 
-// ListHostmap returns details about the actual or pending (handshaking) hostmap
-func (c *Control) ListHostmap(pendingMap bool) []ControlHostInfo {
+// ListHostmapHosts returns details about the actual or pending (handshaking) hostmap by vpn ip
+func (c *Control) ListHostmapHosts(pendingMap bool) []ControlHostInfo {
 	if pendingMap {
-		return listHostMap(c.f.handshakeManager.pendingHostMap)
+		return listHostMapHosts(c.f.handshakeManager.pendingHostMap)
 	} else {
-		return listHostMap(c.f.hostMap)
+		return listHostMapHosts(c.f.hostMap)
+	}
+}
+
+// ListHostmapIndexes returns details about the actual or pending (handshaking) hostmap by local index id
+func (c *Control) ListHostmapIndexes(pendingMap bool) []ControlHostInfo {
+	if pendingMap {
+		return listHostMapIndexes(c.f.handshakeManager.pendingHostMap)
+	} else {
+		return listHostMapIndexes(c.f.hostMap)
 	}
 }
 
@@ -219,7 +227,7 @@ func copyHostInfo(h *HostInfo, preferredRanges []*net.IPNet) ControlHostInfo {
 	}
 
 	if h.ConnectionState != nil {
-		chi.MessageCounter = atomic.LoadUint64(&h.ConnectionState.atomicMessageCounter)
+		chi.MessageCounter = h.ConnectionState.messageCounter.Load()
 	}
 
 	if c := h.GetCert(); c != nil {
@@ -233,7 +241,7 @@ func copyHostInfo(h *HostInfo, preferredRanges []*net.IPNet) ControlHostInfo {
 	return chi
 }
 
-func listHostMap(hm *HostMap) []ControlHostInfo {
+func listHostMapHosts(hm *HostMap) []ControlHostInfo {
 	hm.RLock()
 	hosts := make([]ControlHostInfo, len(hm.Hosts))
 	i := 0
@@ -245,3 +253,16 @@ func listHostMap(hm *HostMap) []ControlHostInfo {
 
 	return hosts
 }
+
+func listHostMapIndexes(hm *HostMap) []ControlHostInfo {
+	hm.RLock()
+	hosts := make([]ControlHostInfo, len(hm.Indexes))
+	i := 0
+	for _, v := range hm.Indexes {
+		hosts[i] = copyHostInfo(v, hm.preferredRanges)
+		i++
+	}
+	hm.RUnlock()
+
+	return hosts
+}

control_tester.go

@@ -6,6 +6,8 @@ package nebula
 import (
 	"net"
 
+	"github.com/slackhq/nebula/cert"
+
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
 	"github.com/slackhq/nebula/header"
@@ -14,7 +16,7 @@ import (
 	"github.com/slackhq/nebula/udp"
 )
 
-// WaitForTypeByIndex will pipe all messages from this control device into the pipeTo control device
+// WaitForType will pipe all messages from this control device into the pipeTo control device
 // returning after a message matching the criteria has been piped
 func (c *Control) WaitForType(msgType header.MessageType, subType header.MessageSubType, pipeTo *Control) {
 	h := &header.H{}
@@ -153,3 +155,11 @@ func (c *Control) KillPendingTunnel(vpnIp net.IP) bool {
 	c.f.handshakeManager.pendingHostMap.DeleteHostInfo(hostinfo)
 	return true
 }
+
+func (c *Control) GetHostmap() *HostMap {
+	return c.f.hostMap
+}
+
+func (c *Control) GetCert() *cert.NebulaCertificate {
+	return c.f.certState.certificate
+}

dist/arch/nebula.service

@@ -1,6 +1,6 @@
 [Unit]
-Description=nebula
-Wants=basic.target network-online.target
+Description=Nebula overlay networking tool
+Wants=basic.target network-online.target nss-lookup.target time-sync.target
 After=basic.target network.target network-online.target
 
 [Service]

dist/fedora/nebula.service

@@ -1,15 +1,14 @@
 [Unit]
 Description=Nebula overlay networking tool
-
+Wants=basic.target network-online.target nss-lookup.target time-sync.target
 After=basic.target network.target network-online.target
 Before=sshd.service
-Wants=basic.target network-online.target
 
 [Service]
+SyslogIdentifier=nebula
 ExecReload=/bin/kill -HUP $MAINPID
 ExecStart=/usr/bin/nebula -config /etc/nebula/config.yml
 Restart=always
-SyslogIdentifier=nebula
 
 [Install]
 WantedBy=multi-user.target

dns_server.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net"
 	"strconv"
+	"strings"
 	"sync"
 
 	"github.com/miekg/dns"
@@ -33,11 +34,10 @@ func newDnsRecords(hostMap *HostMap) *dnsRecords {
 
 func (d *dnsRecords) Query(data string) string {
 	d.RLock()
-	if r, ok := d.dnsMap[data]; ok {
-		d.RUnlock()
+	defer d.RUnlock()
+	if r, ok := d.dnsMap[strings.ToLower(data)]; ok {
 		return r
 	}
-	d.RUnlock()
 	return ""
 }
 
@@ -62,8 +62,8 @@ func (d *dnsRecords) QueryCert(data string) string {
 
 func (d *dnsRecords) Add(host, data string) {
 	d.Lock()
-	d.dnsMap[host] = data
-	d.Unlock()
+	defer d.Unlock()
+	d.dnsMap[strings.ToLower(host)] = data
 }
 
 func parseQuery(l *logrus.Logger, m *dns.Msg, w dns.ResponseWriter) {

e2e/handshakes_test.go

@@ -19,10 +19,10 @@ import (
 func BenchmarkHotPath(b *testing.B) {
 	ca, _, caKey, _ := newTestCaCert(time.Now(), time.Now().Add(10*time.Minute), []*net.IPNet{}, []*net.IPNet{}, []string{})
 	myControl, _, _ := newSimpleServer(ca, caKey, "me", net.IP{10, 0, 0, 1}, nil)
-	theirControl, theirVpnIp, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 2}, nil)
+	theirControl, theirVpnIpNet, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 2}, nil)
 
 	// Put their info in our lighthouse
-	myControl.InjectLightHouseAddr(theirVpnIp, theirUdpAddr)
+	myControl.InjectLightHouseAddr(theirVpnIpNet.IP, theirUdpAddr)
 
 	// Start the servers
 	myControl.Start()
@@ -32,7 +32,7 @@ func BenchmarkHotPath(b *testing.B) {
 	r.CancelFlowLogs()
 
 	for n := 0; n < b.N; n++ {
-		myControl.InjectTunUDPPacket(theirVpnIp, 80, 80, []byte("Hi from me"))
+		myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me"))
 		_ = r.RouteForAllUntilTxTun(theirControl)
 	}
 
@@ -42,18 +42,18 @@ func BenchmarkHotPath(b *testing.B) {
 
 func TestGoodHandshake(t *testing.T) {
 	ca, _, caKey, _ := newTestCaCert(time.Now(), time.Now().Add(10*time.Minute), []*net.IPNet{}, []*net.IPNet{}, []string{})
-	myControl, myVpnIp, myUdpAddr := newSimpleServer(ca, caKey, "me", net.IP{10, 0, 0, 1}, nil)
-	theirControl, theirVpnIp, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 2}, nil)
+	myControl, myVpnIpNet, myUdpAddr := newSimpleServer(ca, caKey, "me", net.IP{10, 0, 0, 1}, nil)
+	theirControl, theirVpnIpNet, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 2}, nil)
 
 	// Put their info in our lighthouse
-	myControl.InjectLightHouseAddr(theirVpnIp, theirUdpAddr)
+	myControl.InjectLightHouseAddr(theirVpnIpNet.IP, theirUdpAddr)
 
 	// Start the servers
 	myControl.Start()
 	theirControl.Start()
 
 	t.Log("Send a udp packet through to begin standing up the tunnel, this should come out the other side")
-	myControl.InjectTunUDPPacket(theirVpnIp, 80, 80, []byte("Hi from me"))
+	myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me"))
 
 	t.Log("Have them consume my stage 0 packet. They have a tunnel now")
 	theirControl.InjectUDPPacket(myControl.GetFromUDP(true))
@@ -74,17 +74,18 @@ func TestGoodHandshake(t *testing.T) {
 	myControl.WaitForType(1, 0, theirControl)
 
 	t.Log("Make sure our host infos are correct")
-	assertHostInfoPair(t, myUdpAddr, theirUdpAddr, myVpnIp, theirVpnIp, myControl, theirControl)
+	assertHostInfoPair(t, myUdpAddr, theirUdpAddr, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl)
 
 	t.Log("Get that cached packet and make sure it looks right")
 	myCachedPacket := theirControl.GetFromTun(true)
-	assertUdpPacket(t, []byte("Hi from me"), myCachedPacket, myVpnIp, theirVpnIp, 80, 80)
+	assertUdpPacket(t, []byte("Hi from me"), myCachedPacket, myVpnIpNet.IP, theirVpnIpNet.IP, 80, 80)
 
 	t.Log("Do a bidirectional tunnel test")
 	r := router.NewR(t, myControl, theirControl)
 	defer r.RenderFlow()
-	assertTunnel(t, myVpnIp, theirVpnIp, myControl, theirControl, r)
+	assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
 
+	r.RenderHostmaps("Final hostmaps", myControl, theirControl)
 	myControl.Stop()
 	theirControl.Stop()
 	//TODO: assert hostmaps
@@ -96,15 +97,15 @@ func TestWrongResponderHandshake(t *testing.T) {
 	// The IPs here are chosen on purpose:
 	// The current remote handling will sort by preference, public, and then lexically.
 	// So we need them to have a higher address than evil (we could apply a preference though)
-	myControl, myVpnIp, myUdpAddr := newSimpleServer(ca, caKey, "me", net.IP{10, 0, 0, 100}, nil)
-	theirControl, theirVpnIp, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 99}, nil)
+	myControl, myVpnIpNet, myUdpAddr := newSimpleServer(ca, caKey, "me", net.IP{10, 0, 0, 100}, nil)
+	theirControl, theirVpnIpNet, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 99}, nil)
 	evilControl, evilVpnIp, evilUdpAddr := newSimpleServer(ca, caKey, "evil", net.IP{10, 0, 0, 2}, nil)
 
 	// Add their real udp addr, which should be tried after evil.
-	myControl.InjectLightHouseAddr(theirVpnIp, theirUdpAddr)
+	myControl.InjectLightHouseAddr(theirVpnIpNet.IP, theirUdpAddr)
 
 	// Put the evil udp addr in for their vpn Ip, this is a case of being lied to by the lighthouse.
-	myControl.InjectLightHouseAddr(theirVpnIp, evilUdpAddr)
+	myControl.InjectLightHouseAddr(theirVpnIpNet.IP, evilUdpAddr)
 
 	// Build a router so we don't have to reason who gets which packet
 	r := router.NewR(t, myControl, theirControl, evilControl)
@@ -116,7 +117,7 @@ func TestWrongResponderHandshake(t *testing.T) {
 	evilControl.Start()
 
 	t.Log("Start the handshake process, we will route until we see our cached packet get sent to them")
-	myControl.InjectTunUDPPacket(theirVpnIp, 80, 80, []byte("Hi from me"))
+	myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me"))
 	r.RouteForAllExitFunc(func(p *udp.Packet, c *nebula.Control) router.ExitType {
 		h := &header.H{}
 		err := h.Parse(p.Data)
@@ -135,34 +136,38 @@ func TestWrongResponderHandshake(t *testing.T) {
 
 	t.Log("My cached packet should be received by them")
 	myCachedPacket := theirControl.GetFromTun(true)
-	assertUdpPacket(t, []byte("Hi from me"), myCachedPacket, myVpnIp, theirVpnIp, 80, 80)
+	assertUdpPacket(t, []byte("Hi from me"), myCachedPacket, myVpnIpNet.IP, theirVpnIpNet.IP, 80, 80)
 
 	t.Log("Test the tunnel with them")
-	assertHostInfoPair(t, myUdpAddr, theirUdpAddr, myVpnIp, theirVpnIp, myControl, theirControl)
-	assertTunnel(t, myVpnIp, theirVpnIp, myControl, theirControl, r)
+	assertHostInfoPair(t, myUdpAddr, theirUdpAddr, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl)
+	assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
 
 	t.Log("Flush all packets from all controllers")
 	r.FlushAll()
 
 	t.Log("Ensure ensure I don't have any hostinfo artifacts from evil")
-	assert.Nil(t, myControl.GetHostInfoByVpnIp(iputil.Ip2VpnIp(evilVpnIp), true), "My pending hostmap should not contain evil")
-	assert.Nil(t, myControl.GetHostInfoByVpnIp(iputil.Ip2VpnIp(evilVpnIp), false), "My main hostmap should not contain evil")
+	assert.Nil(t, myControl.GetHostInfoByVpnIp(iputil.Ip2VpnIp(evilVpnIp.IP), true), "My pending hostmap should not contain evil")
+	assert.Nil(t, myControl.GetHostInfoByVpnIp(iputil.Ip2VpnIp(evilVpnIp.IP), false), "My main hostmap should not contain evil")
 	//NOTE: if evil lost the handshake race it may still have a tunnel since me would reject the handshake since the tunnel is complete
 
 	//TODO: assert hostmaps for everyone
+	r.RenderHostmaps("Final hostmaps", myControl, theirControl, evilControl)
 	t.Log("Success!")
 	myControl.Stop()
 	theirControl.Stop()
 }
 
-func Test_Case1_Stage1Race(t *testing.T) {
+func TestStage1Race(t *testing.T) {
+	// This tests ensures that two hosts handshaking with each other at the same time will allow traffic to flow
+	// But will eventually collapse down to a single tunnel
+
 	ca, _, caKey, _ := newTestCaCert(time.Now(), time.Now().Add(10*time.Minute), []*net.IPNet{}, []*net.IPNet{}, []string{})
-	myControl, myVpnIp, myUdpAddr := newSimpleServer(ca, caKey, "me  ", net.IP{10, 0, 0, 1}, nil)
-	theirControl, theirVpnIp, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 2}, nil)
+	myControl, myVpnIpNet, myUdpAddr := newSimpleServer(ca, caKey, "me  ", net.IP{10, 0, 0, 1}, nil)
+	theirControl, theirVpnIpNet, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 2}, nil)
 
 	// Put their info in our lighthouse and vice versa
-	myControl.InjectLightHouseAddr(theirVpnIp, theirUdpAddr)
-	theirControl.InjectLightHouseAddr(myVpnIp, myUdpAddr)
+	myControl.InjectLightHouseAddr(theirVpnIpNet.IP, theirUdpAddr)
+	theirControl.InjectLightHouseAddr(myVpnIpNet.IP, myUdpAddr)
 
 	// Build a router so we don't have to reason who gets which packet
 	r := router.NewR(t, myControl, theirControl)
@@ -173,8 +178,8 @@ func Test_Case1_Stage1Race(t *testing.T) {
 	theirControl.Start()
 
 	t.Log("Trigger a handshake to start on both me and them")
-	myControl.InjectTunUDPPacket(theirVpnIp, 80, 80, []byte("Hi from me"))
-	theirControl.InjectTunUDPPacket(myVpnIp, 80, 80, []byte("Hi from them"))
+	myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me"))
+	theirControl.InjectTunUDPPacket(myVpnIpNet.IP, 80, 80, []byte("Hi from them"))
 
 	t.Log("Get both stage 1 handshake packets")
 	myHsForThem := myControl.GetFromUDP(true)
@@ -183,43 +188,165 @@ func Test_Case1_Stage1Race(t *testing.T) {
 	r.Log("Now inject both stage 1 handshake packets")
 	r.InjectUDPPacket(theirControl, myControl, theirHsForMe)
 	r.InjectUDPPacket(myControl, theirControl, myHsForThem)
-	//TODO: they should win, grab their index for me and make sure I use it in the end.
 
-	r.Log("They should not have a stage 2 (won the race) but I should send one")
-	r.InjectUDPPacket(myControl, theirControl, myControl.GetFromUDP(true))
+	r.Log("Route until they receive a message packet")
+	myCachedPacket := r.RouteForAllUntilTxTun(theirControl)
+	assertUdpPacket(t, []byte("Hi from me"), myCachedPacket, myVpnIpNet.IP, theirVpnIpNet.IP, 80, 80)
 
-	r.Log("Route for me until I send a message packet to them")
-	r.RouteForAllUntilAfterMsgTypeTo(theirControl, header.Message, header.MessageNone)
+	r.Log("Their cached packet should be received by me")
+	theirCachedPacket := r.RouteForAllUntilTxTun(myControl)
+	assertUdpPacket(t, []byte("Hi from them"), theirCachedPacket, theirVpnIpNet.IP, myVpnIpNet.IP, 80, 80)
 
-	t.Log("My cached packet should be received by them")
-	myCachedPacket := theirControl.GetFromTun(true)
-	assertUdpPacket(t, []byte("Hi from me"), myCachedPacket, myVpnIp, theirVpnIp, 80, 80)
+	r.Log("Do a bidirectional tunnel test")
+	assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
 
-	t.Log("Route for them until I send a message packet to me")
-	theirControl.WaitForType(1, 0, myControl)
+	myHostmapHosts := myControl.ListHostmapHosts(false)
+	myHostmapIndexes := myControl.ListHostmapIndexes(false)
+	theirHostmapHosts := theirControl.ListHostmapHosts(false)
+	theirHostmapIndexes := theirControl.ListHostmapIndexes(false)
 
-	t.Log("Their cached packet should be received by me")
-	theirCachedPacket := myControl.GetFromTun(true)
-	assertUdpPacket(t, []byte("Hi from them"), theirCachedPacket, theirVpnIp, myVpnIp, 80, 80)
+	// We should have two tunnels on both sides
+	assert.Len(t, myHostmapHosts, 1)
+	assert.Len(t, theirHostmapHosts, 1)
+	assert.Len(t, myHostmapIndexes, 2)
+	assert.Len(t, theirHostmapIndexes, 2)
 
-	t.Log("Do a bidirectional tunnel test")
-	assertTunnel(t, myVpnIp, theirVpnIp, myControl, theirControl, r)
+	r.RenderHostmaps("Starting hostmaps", myControl, theirControl)
 
+	r.Log("Spin until connection manager tears down a tunnel")
+
+	for len(myControl.GetHostmap().Indexes)+len(theirControl.GetHostmap().Indexes) > 2 {
+		assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
+		t.Log("Connection manager hasn't ticked yet")
+		time.Sleep(time.Second)
+	}
+
+	myFinalHostmapHosts := myControl.ListHostmapHosts(false)
+	myFinalHostmapIndexes := myControl.ListHostmapIndexes(false)
+	theirFinalHostmapHosts := theirControl.ListHostmapHosts(false)
+	theirFinalHostmapIndexes := theirControl.ListHostmapIndexes(false)
+
+	// We should only have a single tunnel now on both sides
+	assert.Len(t, myFinalHostmapHosts, 1)
+	assert.Len(t, theirFinalHostmapHosts, 1)
+	assert.Len(t, myFinalHostmapIndexes, 1)
+	assert.Len(t, theirFinalHostmapIndexes, 1)
+
+	r.RenderHostmaps("Final hostmaps", myControl, theirControl)
 	myControl.Stop()
 	theirControl.Stop()
-	//TODO: assert hostmaps
+}
+
+func TestUncleanShutdownRaceLoser(t *testing.T) {
+	ca, _, caKey, _ := newTestCaCert(time.Now(), time.Now().Add(10*time.Minute), []*net.IPNet{}, []*net.IPNet{}, []string{})
+	myControl, myVpnIpNet, myUdpAddr := newSimpleServer(ca, caKey, "me  ", net.IP{10, 0, 0, 1}, nil)
+	theirControl, theirVpnIpNet, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 2}, nil)
+
+	// Teach my how to get to the relay and that their can be reached via the relay
+	myControl.InjectLightHouseAddr(theirVpnIpNet.IP, theirUdpAddr)
+	theirControl.InjectLightHouseAddr(myVpnIpNet.IP, myUdpAddr)
+
+	// Build a router so we don't have to reason who gets which packet
+	r := router.NewR(t, myControl, theirControl)
+	defer r.RenderFlow()
+
+	// Start the servers
+	myControl.Start()
+	theirControl.Start()
+
+	r.Log("Trigger a handshake from me to them")
+	myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me"))
+
+	p := r.RouteForAllUntilTxTun(theirControl)
+	assertUdpPacket(t, []byte("Hi from me"), p, myVpnIpNet.IP, theirVpnIpNet.IP, 80, 80)
+
+	r.Log("Nuke my hostmap")
+	myHostmap := myControl.GetHostmap()
+	myHostmap.Hosts = map[iputil.VpnIp]*nebula.HostInfo{}
+	myHostmap.Indexes = map[uint32]*nebula.HostInfo{}
+	myHostmap.RemoteIndexes = map[uint32]*nebula.HostInfo{}
+
+	myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me again"))
+	p = r.RouteForAllUntilTxTun(theirControl)
+	assertUdpPacket(t, []byte("Hi from me again"), p, myVpnIpNet.IP, theirVpnIpNet.IP, 80, 80)
+
+	r.Log("Assert the tunnel works")
+	assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
+
+	r.Log("Wait for the dead index to go away")
+	start := len(theirControl.GetHostmap().Indexes)
+	for {
+		assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
+		if len(theirControl.GetHostmap().Indexes) < start {
+			break
+		}
+		time.Sleep(time.Second)
+	}
+
+	r.RenderHostmaps("Final hostmaps", myControl, theirControl)
+}
+
+func TestUncleanShutdownRaceWinner(t *testing.T) {
+	ca, _, caKey, _ := newTestCaCert(time.Now(), time.Now().Add(10*time.Minute), []*net.IPNet{}, []*net.IPNet{}, []string{})
+	myControl, myVpnIpNet, myUdpAddr := newSimpleServer(ca, caKey, "me  ", net.IP{10, 0, 0, 1}, nil)
+	theirControl, theirVpnIpNet, theirUdpAddr := newSimpleServer(ca, caKey, "them", net.IP{10, 0, 0, 2}, nil)
+
+	// Teach my how to get to the relay and that their can be reached via the relay
+	myControl.InjectLightHouseAddr(theirVpnIpNet.IP, theirUdpAddr)
+	theirControl.InjectLightHouseAddr(myVpnIpNet.IP, myUdpAddr)
+
+	// Build a router so we don't have to reason who gets which packet
+	r := router.NewR(t, myControl, theirControl)
+	defer r.RenderFlow()
+
+	// Start the servers
+	myControl.Start()
+	theirControl.Start()
+
+	r.Log("Trigger a handshake from me to them")
+	myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me"))
+
+	p := r.RouteForAllUntilTxTun(theirControl)
+	assertUdpPacket(t, []byte("Hi from me"), p, myVpnIpNet.IP, theirVpnIpNet.IP, 80, 80)
+	r.RenderHostmaps("Final hostmaps", myControl, theirControl)
+
+	r.Log("Nuke my hostmap")
+	theirHostmap := theirControl.GetHostmap()
+	theirHostmap.Hosts = map[iputil.VpnIp]*nebula.HostInfo{}
+	theirHostmap.Indexes = map[uint32]*nebula.HostInfo{}
+	theirHostmap.RemoteIndexes = map[uint32]*nebula.HostInfo{}
+
+	theirControl.InjectTunUDPPacket(myVpnIpNet.IP, 80, 80, []byte("Hi from them again"))
+	p = r.RouteForAllUntilTxTun(myControl)
+	assertUdpPacket(t, []byte("Hi from them again"), p, theirVpnIpNet.IP, myVpnIpNet.IP, 80, 80)
+	r.RenderHostmaps("Derp hostmaps", myControl, theirControl)
+
+	r.Log("Assert the tunnel works")
+	assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
+
+	r.Log("Wait for the dead index to go away")
+	start := len(myControl.GetHostmap().Indexes)
+	for {
+		assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
+		if len(myControl.GetHostmap().Indexes) < start {
+			break
+		}
+		time.Sleep(time.Second)
+	}
+
+	r.RenderHostmaps("Final hostmaps", myControl, theirControl)
 }
 
 func TestRelays(t *testing.T) {
 	ca, _, caKey, _ := newTestCaCert(time.Now(), time.Now().Add(10*time.Minute), []*net.IPNet{}, []*net.IPNet{}, []string{})
-	myControl, myVpnIp, _ := newSimpleServer(ca, caKey, "me     ", net.IP{10, 0, 0, 1}, m{"relay": m{"use_relays": true}})
-	relayControl, relayVpnIp, relayUdpAddr := newSimpleServer(ca, caKey, "relay  ", net.IP{10, 0, 0, 128}, m{"relay": m{"am_relay": true}})
-	theirControl, theirVpnIp, theirUdpAddr := newSimpleServer(ca, caKey, "them   ", net.IP{10, 0, 0, 2}, m{"relay": m{"use_relays": true}})
+	myControl, myVpnIpNet, _ := newSimpleServer(ca, caKey, "me     ", net.IP{10, 0, 0, 1}, m{"relay": m{"use_relays": true}})
+	relayControl, relayVpnIpNet, relayUdpAddr := newSimpleServer(ca, caKey, "relay  ", net.IP{10, 0, 0, 128}, m{"relay": m{"am_relay": true}})
+	theirControl, theirVpnIpNet, theirUdpAddr := newSimpleServer(ca, caKey, "them   ", net.IP{10, 0, 0, 2}, m{"relay": m{"use_relays": true}})
 
 	// Teach my how to get to the relay and that their can be reached via the relay
-	myControl.InjectLightHouseAddr(relayVpnIp, relayUdpAddr)
-	myControl.InjectRelays(theirVpnIp, []net.IP{relayVpnIp})
-	relayControl.InjectLightHouseAddr(theirVpnIp, theirUdpAddr)
+	myControl.InjectLightHouseAddr(relayVpnIpNet.IP, relayUdpAddr)
+	myControl.InjectRelays(theirVpnIpNet.IP, []net.IP{relayVpnIpNet.IP})
+	relayControl.InjectLightHouseAddr(theirVpnIpNet.IP, theirUdpAddr)
 
 	// Build a router so we don't have to reason who gets which packet
 	r := router.NewR(t, myControl, relayControl, theirControl)
@@ -231,11 +358,84 @@ func TestRelays(t *testing.T) {
 	theirControl.Start()
 
 	t.Log("Trigger a handshake from me to them via the relay")
-	myControl.InjectTunUDPPacket(theirVpnIp, 80, 80, []byte("Hi from me"))
+	myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me"))
 
 	p := r.RouteForAllUntilTxTun(theirControl)
-	assertUdpPacket(t, []byte("Hi from me"), p, myVpnIp, theirVpnIp, 80, 80)
+	r.Log("Assert the tunnel works")
+	assertUdpPacket(t, []byte("Hi from me"), p, myVpnIpNet.IP, theirVpnIpNet.IP, 80, 80)
+	r.RenderHostmaps("Final hostmaps", myControl, relayControl, theirControl)
 	//TODO: assert we actually used the relay even though it should be impossible for a tunnel to have occurred without it
 }
 
+func TestStage1RaceRelays(t *testing.T) {
+	//NOTE: this is a race between me and relay resulting in a full tunnel from me to them via relay
+	ca, _, caKey, _ := newTestCaCert(time.Now(), time.Now().Add(10*time.Minute), []*net.IPNet{}, []*net.IPNet{}, []string{})
+	myControl, myVpnIpNet, myUdpAddr := newSimpleServer(ca, caKey, "me     ", net.IP{10, 0, 0, 1}, m{"relay": m{"use_relays": true}})
+	relayControl, relayVpnIpNet, relayUdpAddr := newSimpleServer(ca, caKey, "relay  ", net.IP{10, 0, 0, 128}, m{"relay": m{"am_relay": true}})
+	theirControl, theirVpnIpNet, theirUdpAddr := newSimpleServer(ca, caKey, "them   ", net.IP{10, 0, 0, 2}, m{"relay": m{"use_relays": true}})
+
+	// Teach my how to get to the relay and that their can be reached via the relay
+	myControl.InjectLightHouseAddr(relayVpnIpNet.IP, relayUdpAddr)
+	theirControl.InjectLightHouseAddr(relayVpnIpNet.IP, relayUdpAddr)
+
+	myControl.InjectRelays(theirVpnIpNet.IP, []net.IP{relayVpnIpNet.IP})
+	theirControl.InjectRelays(myVpnIpNet.IP, []net.IP{relayVpnIpNet.IP})
+
+	relayControl.InjectLightHouseAddr(theirVpnIpNet.IP, theirUdpAddr)
+	relayControl.InjectLightHouseAddr(myVpnIpNet.IP, myUdpAddr)
+
+	// Build a router so we don't have to reason who gets which packet
+	r := router.NewR(t, myControl, relayControl, theirControl)
+	defer r.RenderFlow()
+
+	// Start the servers
+	myControl.Start()
+	relayControl.Start()
+	theirControl.Start()
+
+	r.Log("Trigger a handshake to start on both me and relay")
+	myControl.InjectTunUDPPacket(relayVpnIpNet.IP, 80, 80, []byte("Hi from me"))
+	relayControl.InjectTunUDPPacket(myVpnIpNet.IP, 80, 80, []byte("Hi from relay"))
+
+	r.Log("Get both stage 1 handshake packets")
+	//TODO: this is where it breaks, we need to get the hs packets for the relay not for the destination
+	myHsForThem := myControl.GetFromUDP(true)
+	relayHsForMe := relayControl.GetFromUDP(true)
+
+	r.Log("Now inject both stage 1 handshake packets")
+	r.InjectUDPPacket(relayControl, myControl, relayHsForMe)
+	r.InjectUDPPacket(myControl, relayControl, myHsForThem)
+
+	r.Log("Route for me until I send a message packet to relay")
+	r.RouteForAllUntilAfterMsgTypeTo(relayControl, header.Message, header.MessageNone)
+
+	r.Log("My cached packet should be received by relay")
+	myCachedPacket := relayControl.GetFromTun(true)
+	assertUdpPacket(t, []byte("Hi from me"), myCachedPacket, myVpnIpNet.IP, relayVpnIpNet.IP, 80, 80)
+
+	r.Log("Relays cached packet should be received by me")
+	relayCachedPacket := r.RouteForAllUntilTxTun(myControl)
+	assertUdpPacket(t, []byte("Hi from relay"), relayCachedPacket, relayVpnIpNet.IP, myVpnIpNet.IP, 80, 80)
+
+	r.Log("Do a bidirectional tunnel test; me and relay")
+	assertTunnel(t, myVpnIpNet.IP, relayVpnIpNet.IP, myControl, relayControl, r)
+
+	r.Log("Create a tunnel between relay and them")
+	assertTunnel(t, theirVpnIpNet.IP, relayVpnIpNet.IP, theirControl, relayControl, r)
+
+	r.RenderHostmaps("Starting hostmaps", myControl, relayControl, theirControl)
+
+	r.Log("Trigger a handshake to start from me to them via the relay")
+	//TODO: if we initiate a handshake from me and then assert the tunnel it will cause a relay control race that can blow up
+	//	this is a problem that exists on master today
+	//myControl.InjectTunUDPPacket(theirVpnIpNet.IP, 80, 80, []byte("Hi from me"))
+	assertTunnel(t, myVpnIpNet.IP, theirVpnIpNet.IP, myControl, theirControl, r)
+
+	myControl.Stop()
+	theirControl.Stop()
+	relayControl.Stop()
+	//
+	////TODO: assert hostmaps
+}
+
 //TODO: add a test with many lies

e2e/helpers_test.go

@@ -30,7 +30,7 @@ import (
 type m map[string]interface{}
 
 // newSimpleServer creates a nebula instance with many assumptions
-func newSimpleServer(caCrt *cert.NebulaCertificate, caKey []byte, name string, udpIp net.IP, overrides m) (*nebula.Control, net.IP, *net.UDPAddr) {
+func newSimpleServer(caCrt *cert.NebulaCertificate, caKey []byte, name string, udpIp net.IP, overrides m) (*nebula.Control, *net.IPNet, *net.UDPAddr) {
 	l := NewTestLogger()
 
 	vpnIpNet := &net.IPNet{IP: make([]byte, len(udpIp)), Mask: net.IPMask{255, 255, 255, 0}}
@@ -101,7 +101,7 @@ func newSimpleServer(caCrt *cert.NebulaCertificate, caKey []byte, name string, u
 		panic(err)
 	}
 
-	return control, vpnIpNet.IP, &udpAddr
+	return control, vpnIpNet, &udpAddr
 }
 
 // newTestCaCert will generate a CA cert
@@ -231,12 +231,12 @@ func deadline(t *testing.T, seconds time.Duration) doneCb {
 func assertTunnel(t *testing.T, vpnIpA, vpnIpB net.IP, controlA, controlB *nebula.Control, r *router.R) {
 	// Send a packet from them to me
 	controlB.InjectTunUDPPacket(vpnIpA, 80, 90, []byte("Hi from B"))
-	bPacket := r.RouteUntilTxTun(controlB, controlA)
+	bPacket := r.RouteForAllUntilTxTun(controlA)
 	assertUdpPacket(t, []byte("Hi from B"), bPacket, vpnIpB, vpnIpA, 90, 80)
 
 	// And once more from me to them
 	controlA.InjectTunUDPPacket(vpnIpB, 80, 90, []byte("Hello from A"))
-	aPacket := r.RouteUntilTxTun(controlA, controlB)
+	aPacket := r.RouteForAllUntilTxTun(controlB)
 	assertUdpPacket(t, []byte("Hello from A"), aPacket, vpnIpA, vpnIpB, 90, 80)
 }
 

e2e/router/hostmap.go

@@ -0,0 +1,139 @@
+//go:build e2e_testing
+// +build e2e_testing
+
+package router
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+
+	"github.com/slackhq/nebula"
+	"github.com/slackhq/nebula/iputil"
+)
+
+type edge struct {
+	from string
+	to   string
+	dual bool
+}
+
+func renderHostmaps(controls ...*nebula.Control) string {
+	var lines []*edge
+	r := "graph TB\n"
+	for _, c := range controls {
+		sr, se := renderHostmap(c)
+		r += sr
+		for _, e := range se {
+			add := true
+
+			// Collapse duplicate edges into a bi-directionally connected edge
+			for _, ge := range lines {
+				if e.to == ge.from && e.from == ge.to {
+					add = false
+					ge.dual = true
+					break
+				}
+			}
+
+			if add {
+				lines = append(lines, e)
+			}
+		}
+	}
+
+	for _, line := range lines {
+		if line.dual {
+			r += fmt.Sprintf("\t%v <--> %v\n", line.from, line.to)
+		} else {
+			r += fmt.Sprintf("\t%v --> %v\n", line.from, line.to)
+		}
+
+	}
+
+	return r
+}
+
+func renderHostmap(c *nebula.Control) (string, []*edge) {
+	var lines []string
+	var globalLines []*edge
+
+	clusterName := strings.Trim(c.GetCert().Details.Name, " ")
+	clusterVpnIp := c.GetCert().Details.Ips[0].IP
+	r := fmt.Sprintf("\tsubgraph %s[\"%s (%s)\"]\n", clusterName, clusterName, clusterVpnIp)
+
+	hm := c.GetHostmap()
+
+	// Draw the vpn to index nodes
+	r += fmt.Sprintf("\t\tsubgraph %s.hosts[\"Hosts (vpn ip to index)\"]\n", clusterName)
+	for _, vpnIp := range sortedHosts(hm.Hosts) {
+		hi := hm.Hosts[vpnIp]
+		r += fmt.Sprintf("\t\t\t%v.%v[\"%v\"]\n", clusterName, vpnIp, vpnIp)
+		lines = append(lines, fmt.Sprintf("%v.%v --> %v.%v", clusterName, vpnIp, clusterName, hi.GetLocalIndex()))
+
+		rs := hi.GetRelayState()
+		for _, relayIp := range rs.CopyRelayIps() {
+			lines = append(lines, fmt.Sprintf("%v.%v --> %v.%v", clusterName, vpnIp, clusterName, relayIp))
+		}
+
+		for _, relayIp := range rs.CopyRelayForIdxs() {
+			lines = append(lines, fmt.Sprintf("%v.%v --> %v.%v", clusterName, vpnIp, clusterName, relayIp))
+		}
+	}
+	r += "\t\tend\n"
+
+	// Draw the relay hostinfos
+	if len(hm.Relays) > 0 {
+		r += fmt.Sprintf("\t\tsubgraph %s.relays[\"Relays (relay index to hostinfo)\"]\n", clusterName)
+		for relayIndex, hi := range hm.Relays {
+			r += fmt.Sprintf("\t\t\t%v.%v[\"%v\"]\n", clusterName, relayIndex, relayIndex)
+			lines = append(lines, fmt.Sprintf("%v.%v --> %v.%v", clusterName, relayIndex, clusterName, hi.GetLocalIndex()))
+		}
+		r += "\t\tend\n"
+	}
+
+	// Draw the local index to relay or remote index nodes
+	r += fmt.Sprintf("\t\tsubgraph indexes.%s[\"Indexes (index to hostinfo)\"]\n", clusterName)
+	for _, idx := range sortedIndexes(hm.Indexes) {
+		hi := hm.Indexes[idx]
+		r += fmt.Sprintf("\t\t\t%v.%v[\"%v (%v)\"]\n", clusterName, idx, idx, hi.GetVpnIp())
+		remoteClusterName := strings.Trim(hi.GetCert().Details.Name, " ")
+		globalLines = append(globalLines, &edge{from: fmt.Sprintf("%v.%v", clusterName, idx), to: fmt.Sprintf("%v.%v", remoteClusterName, hi.GetRemoteIndex())})
+		_ = hi
+	}
+	r += "\t\tend\n"
+
+	// Add the edges inside this host
+	for _, line := range lines {
+		r += fmt.Sprintf("\t\t%v\n", line)
+	}
+
+	r += "\tend\n"
+	return r, globalLines
+}
+
+func sortedHosts(hosts map[iputil.VpnIp]*nebula.HostInfo) []iputil.VpnIp {
+	keys := make([]iputil.VpnIp, 0, len(hosts))
+	for key := range hosts {
+		keys = append(keys, key)
+	}
+
+	sort.SliceStable(keys, func(i, j int) bool {
+		return keys[i] > keys[j]
+	})
+
+	return keys
+}
+
+func sortedIndexes(indexes map[uint32]*nebula.HostInfo) []uint32 {
+	keys := make([]uint32, 0, len(indexes))
+	for key := range indexes {
+		keys = append(keys, key)
+	}
+
+	sort.SliceStable(keys, func(i, j int) bool {
+		return keys[i] > keys[j]
+	})
+
+	return keys
+}

e2e/router/router.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -22,6 +23,7 @@ import (
 	"github.com/slackhq/nebula/header"
 	"github.com/slackhq/nebula/iputil"
 	"github.com/slackhq/nebula/udp"
+	"golang.org/x/exp/maps"
 )
 
 type R struct {
@@ -40,7 +42,12 @@ type R struct {
 	// A map of vpn ip to the nebula control it belongs to
 	vpnControls map[iputil.VpnIp]*nebula.Control
 
-	flow []flowEntry
+	ignoreFlows []ignoreFlow
+	flow        []flowEntry
+
+	// A set of additional mermaid graphs to draw in the flow log markdown file
+	// Currently consisting only of hostmap renders
+	additionalGraphs []mermaidGraph
 
 	// All interactions are locked to help serialize behavior
 	sync.Mutex
@@ -50,6 +57,24 @@ type R struct {
 	t            testing.TB
 }
 
+type ignoreFlow struct {
+	tun         NullBool
+	messageType header.MessageType
+	subType     header.MessageSubType
+	//from
+	//to
+}
+
+type mermaidGraph struct {
+	title   string
+	content string
+}
+
+type NullBool struct {
+	HasValue bool
+	IsTrue   bool
+}
+
 type flowEntry struct {
 	note   string
 	packet *packet
@@ -98,6 +123,7 @@ func NewR(t testing.TB, controls ...*nebula.Control) *R {
 		inNat:        make(map[string]*nebula.Control),
 		outNat:       make(map[string]net.UDPAddr),
 		flow:         []flowEntry{},
+		ignoreFlows:  []ignoreFlow{},
 		fn:           filepath.Join("mermaid", fmt.Sprintf("%s.md", t.Name())),
 		t:            t,
 		cancelRender: cancel,
@@ -126,6 +152,7 @@ func NewR(t testing.TB, controls ...*nebula.Control) *R {
 			case <-ctx.Done():
 				return
 			case <-clockSource.C:
+				r.renderHostmaps("clock tick")
 				r.renderFlow()
 			}
 		}
@@ -196,11 +223,16 @@ func (r *R) renderFlow() {
 		)
 	}
 
+	if len(participantsVals) > 2 {
+		// Get the first and last participantVals for notes
+		participantsVals = []string{participantsVals[0], participantsVals[len(participantsVals)-1]}
+	}
+
 	// Print packets
 	h := &header.H{}
 	for _, e := range r.flow {
 		if e.packet == nil {
-			fmt.Fprintf(f, "    note over %s: %s\n", strings.Join(participantsVals, ", "), e.note)
+			//fmt.Fprintf(f, "    note over %s: %s\n", strings.Join(participantsVals, ", "), e.note)
 			continue
 		}
 
@@ -219,15 +251,77 @@ func (r *R) renderFlow() {
 			}
 
 			fmt.Fprintf(f,
-				"    %s%s%s: %s(%s), counter: %v\n",
+				"    %s%s%s: %s(%s), index %v, counter: %v\n",
 				strings.Replace(p.from.GetUDPAddr(), ":", "#58;", 1),
 				line,
 				strings.Replace(p.to.GetUDPAddr(), ":", "#58;", 1),
-				h.TypeName(), h.SubTypeName(), h.MessageCounter,
+				h.TypeName(), h.SubTypeName(), h.RemoteIndex, h.MessageCounter,
 			)
 		}
 	}
 	fmt.Fprintln(f, "```")
+
+	for _, g := range r.additionalGraphs {
+		fmt.Fprintf(f, "## %s\n", g.title)
+		fmt.Fprintln(f, "```mermaid")
+		fmt.Fprintln(f, g.content)
+		fmt.Fprintln(f, "```")
+	}
+}
+
+// IgnoreFlow tells the router to stop recording future flows that matches the provided criteria.
+// messageType and subType will target nebula underlay packets while tun will target nebula overlay packets
+// NOTE: This is a very broad system, if you set tun to true then no more tun traffic will be rendered
+func (r *R) IgnoreFlow(messageType header.MessageType, subType header.MessageSubType, tun NullBool) {
+	r.Lock()
+	defer r.Unlock()
+	r.ignoreFlows = append(r.ignoreFlows, ignoreFlow{
+		tun,
+		messageType,
+		subType,
+	})
+}
+
+func (r *R) RenderHostmaps(title string, controls ...*nebula.Control) {
+	r.Lock()
+	defer r.Unlock()
+
+	s := renderHostmaps(controls...)
+	if len(r.additionalGraphs) > 0 {
+		lastGraph := r.additionalGraphs[len(r.additionalGraphs)-1]
+		if lastGraph.content == s && lastGraph.title == title {
+			// Ignore this rendering if it matches the last rendering added
+			// This is useful if you want to track rendering changes
+			return
+		}
+	}
+
+	r.additionalGraphs = append(r.additionalGraphs, mermaidGraph{
+		title:   title,
+		content: s,
+	})
+}
+
+func (r *R) renderHostmaps(title string) {
+	c := maps.Values(r.controls)
+	sort.SliceStable(c, func(i, j int) bool {
+		return c[i].GetVpnIp() > c[j].GetVpnIp()
+	})
+
+	s := renderHostmaps(c...)
+	if len(r.additionalGraphs) > 0 {
+		lastGraph := r.additionalGraphs[len(r.additionalGraphs)-1]
+		if lastGraph.content == s {
+			// Ignore this rendering if it matches the last rendering added
+			// This is useful if you want to track rendering changes
+			return
+		}
+	}
+
+	r.additionalGraphs = append(r.additionalGraphs, mermaidGraph{
+		title:   title,
+		content: s,
+	})
 }
 
 // InjectFlow can be used to record packet flow if the test is handling the routing on its own.
@@ -268,6 +362,26 @@ func (r *R) unlockedInjectFlow(from, to *nebula.Control, p *udp.Packet, tun bool
 		return nil
 	}
 
+	r.renderHostmaps(fmt.Sprintf("Packet %v", len(r.flow)))
+
+	if len(r.ignoreFlows) > 0 {
+		var h header.H
+		err := h.Parse(p.Data)
+		if err != nil {
+			panic(err)
+		}
+
+		for _, i := range r.ignoreFlows {
+			if !tun {
+				if i.messageType == h.Type && i.subType == h.Subtype {
+					return nil
+				}
+			} else if i.tun.HasValue && i.tun.IsTrue {
+				return nil
+			}
+		}
+	}
+
 	fp := &packet{
 		from:   from,
 		to:     to,

examples/config.yml

@@ -47,8 +47,9 @@ lighthouse:
   # allowed. You can provide CIDRs here with `true` to allow and `false` to
   # deny. The most specific CIDR rule applies to each remote. If all rules are
   # "allow", the default will be "deny", and vice-versa. If both "allow" and
-  # "deny" rules are present, then you MUST set a rule for "0.0.0.0/0" as the
-  # default.
+  # "deny" IPv4 rules are present, then you MUST set a rule for "0.0.0.0/0" as
+  # the default. Similarly if both "allow" and "deny" IPv6 rules are present,
+  # then you MUST set a rule for "::/0" as the default.
   #remote_allow_list:
     # Example to block IPs from this subnet from being used for remote IPs.
     #"172.16.0.0/12": false
@@ -58,7 +59,7 @@ lighthouse:
     #"10.0.0.0/8": false
     #"10.42.42.0/24": true
 
-  # EXPERIMENTAL: This option my change or disappear in the future.
+  # EXPERIMENTAL: This option may change or disappear in the future.
   # Optionally allows the definition of remote_allow_list blocks
   # specific to an inside VPN IP CIDR.
   #remote_allow_ranges:
@@ -133,7 +134,7 @@ punchy:
 
 # Cipher allows you to choose between the available ciphers for your network. Options are chachapoly or aes
 # IMPORTANT: this value must be identical on ALL NODES/LIGHTHOUSES. We do not/will not support use of different ciphers simultaneously!
-#cipher: chachapoly
+#cipher: aes
 
 # Preferred ranges is used to define a hint about the local network ranges, which speeds up discovering the fastest
 # path to a network adjacent nebula node.

examples/quickstart-vagrant/ansible/roles/nebula/files/systemd.nebula.service

@@ -1,7 +1,8 @@
 [Unit]
-Description=nebula
-Wants=basic.target
-After=basic.target network.target
+Description=Nebula overlay networking tool
+Wants=basic.target network-online.target nss-lookup.target time-sync.target
+After=basic.target network.target network-online.target
+Before=sshd.service
 
 [Service]
 SyslogIdentifier=nebula

examples/service_scripts/nebula.plist

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <dict>
+        <key>KeepAlive</key>
+        <true/>
+        <key>Label</key>
+        <string>net.defined.nebula</string>
+        <key>WorkingDirectory</key>
+        <string>/Users/{username}/.local/bin/nebula</string>
+        <key>LimitLoadToSessionType</key>
+        <array>
+            <string>Aqua</string>
+            <string>Background</string>
+            <string>LoginWindow</string>
+            <string>StandardIO</string>
+            <string>System</string>
+        </array>
+        <key>ProgramArguments</key>
+        <array>
+            <string>./nebula</string>
+            <string>-config</string>
+            <string>./config.yml</string>
+        </array>
+        <key>RunAtLoad</key>
+        <true/>
+        <key>StandardErrorPath</key>
+        <string>./nebula.log</string>
+        <key>StandardOutPath</key>
+        <string>./nebula.log</string>
+        <key>UserName</key>
+        <string>root</string>
+    </dict>
+</plist>

examples/service_scripts/nebula.service

@@ -1,7 +1,7 @@
 [Unit]
-Description=nebula
-Wants=basic.target
-After=basic.target network.target
+Description=Nebula overlay networking tool
+Wants=basic.target network-online.target nss-lookup.target time-sync.target
+After=basic.target network.target network-online.target
 Before=sshd.service
 
 [Service]

firewall.go

@@ -77,7 +77,7 @@ type FirewallConntrack struct {
 	sync.Mutex
 
 	Conns      map[firewall.Packet]*conn
-	TimerWheel *TimerWheel
+	TimerWheel *TimerWheel[firewall.Packet]
 }
 
 type FirewallTable struct {
@@ -145,7 +145,7 @@ func NewFirewall(l *logrus.Logger, tcpTimeout, UDPTimeout, defaultTimeout time.D
 	return &Firewall{
 		Conntrack: &FirewallConntrack{
 			Conns:      make(map[firewall.Packet]*conn),
-			TimerWheel: NewTimerWheel(min, max),
+			TimerWheel: NewTimerWheel[firewall.Packet](min, max),
 		},
 		InRules:        newFirewallTable(),
 		OutRules:       newFirewallTable(),
@@ -510,6 +510,7 @@ func (f *Firewall) addConn(packet []byte, fp firewall.Packet, incoming bool) {
 	conntrack := f.Conntrack
 	conntrack.Lock()
 	if _, ok := conntrack.Conns[fp]; !ok {
+		conntrack.TimerWheel.Advance(time.Now())
 		conntrack.TimerWheel.Add(fp, timeout)
 	}
 
@@ -537,6 +538,7 @@ func (f *Firewall) evict(p firewall.Packet) {
 
 	// Timeout is in the future, re-add the timer
 	if newT > 0 {
+		conntrack.TimerWheel.Advance(time.Now())
 		conntrack.TimerWheel.Add(p, newT)
 		return
 	}
@@ -879,7 +881,7 @@ func parsePort(s string) (startPort, endPort int32, err error) {
 	return
 }
 
-//TODO: write tests for these
+// TODO: write tests for these
 func setTCPRTTTracking(c *conn, p []byte) {
 	if c.Seq != 0 {
 		return

firewall/cache.go

@@ -13,7 +13,7 @@ type ConntrackCache map[Packet]struct{}
 
 type ConntrackCacheTicker struct {
 	cacheV    uint64
-	cacheTick uint64
+	cacheTick atomic.Uint64
 
 	cache ConntrackCache
 }
@@ -35,7 +35,7 @@ func NewConntrackCacheTicker(d time.Duration) *ConntrackCacheTicker {
 func (c *ConntrackCacheTicker) tick(d time.Duration) {
 	for {
 		time.Sleep(d)
-		atomic.AddUint64(&c.cacheTick, 1)
+		c.cacheTick.Add(1)
 	}
 }
 
@@ -45,7 +45,7 @@ func (c *ConntrackCacheTicker) Get(l *logrus.Logger) ConntrackCache {
 	if c == nil {
 		return nil
 	}
-	if tick := atomic.LoadUint64(&c.cacheTick); tick != c.cacheV {
+	if tick := c.cacheTick.Load(); tick != c.cacheV {
 		c.cacheV = tick
 		if ll := len(c.cache); ll > 0 {
 			if l.Level == logrus.DebugLevel {

firewall_test.go

@@ -34,27 +34,27 @@ func TestNewFirewall(t *testing.T) {
 
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
-	assert.Equal(t, 3601, conntrack.TimerWheel.wheelLen)
+	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Second, time.Hour, time.Minute, c)
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
-	assert.Equal(t, 3601, conntrack.TimerWheel.wheelLen)
+	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Hour, time.Second, time.Minute, c)
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
-	assert.Equal(t, 3601, conntrack.TimerWheel.wheelLen)
+	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Hour, time.Minute, time.Second, c)
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
-	assert.Equal(t, 3601, conntrack.TimerWheel.wheelLen)
+	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Minute, time.Hour, time.Second, c)
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
-	assert.Equal(t, 3601, conntrack.TimerWheel.wheelLen)
+	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Minute, time.Second, time.Hour, c)
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
-	assert.Equal(t, 3601, conntrack.TimerWheel.wheelLen)
+	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 }
 
 func TestFirewall_AddRule(t *testing.T) {

go.mod

@@ -1,6 +1,6 @@
 module github.com/slackhq/nebula
 
-go 1.18
+go 1.19
 
 require (
 	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be
@@ -9,23 +9,24 @@ require (
 	github.com/flynn/noise v1.0.0
 	github.com/gogo/protobuf v1.3.2
 	github.com/google/gopacket v1.1.19
-	github.com/imdario/mergo v0.3.8
-	github.com/kardianos/service v1.2.1
-	github.com/miekg/dns v1.1.48
+	github.com/imdario/mergo v0.3.13
+	github.com/kardianos/service v1.2.2
+	github.com/miekg/dns v1.1.50
 	github.com/nbrownus/go-metrics-prometheus v0.0.0-20210712211119-974a6260965f
-	github.com/prometheus/client_golang v1.12.1
+	github.com/prometheus/client_golang v1.14.0
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475
-	github.com/sirupsen/logrus v1.8.1
+	github.com/sirupsen/logrus v1.9.0
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
 	github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8
-	github.com/stretchr/testify v1.7.1
+	github.com/stretchr/testify v1.8.1
 	github.com/vishvananda/netlink v1.1.0
-	golang.org/x/crypto v0.0.0-20220331220935-ae2d96664a29
-	golang.org/x/net v0.0.0-20220403103023-749bd193bc2b
-	golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71
+	golang.org/x/crypto v0.3.0
+	golang.org/x/exp v0.0.0-20230224173230-c95f2b4c22f2
+	golang.org/x/net v0.2.0
+	golang.org/x/sys v0.2.0
 	golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224
 	golang.zx2c4.com/wireguard/windows v0.5.3
-	google.golang.org/protobuf v1.28.0
+	google.golang.org/protobuf v1.28.1
 	gopkg.in/yaml.v2 v2.4.0
 )
 
@@ -34,15 +35,14 @@ require (
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/prometheus/common v0.33.0 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
-	github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 // indirect
-	golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3 // indirect
-	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
-	golang.org/x/tools v0.1.10 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+	github.com/prometheus/client_model v0.3.0 // indirect
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
+	github.com/vishvananda/netns v0.0.1 // indirect
+	golang.org/x/mod v0.7.0 // indirect
+	golang.org/x/term v0.2.0 // indirect
+	golang.org/x/tools v0.3.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -119,8 +119,8 @@ github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8=
 github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo/Vo+TKTo=
@@ -139,8 +139,8 @@ github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5m
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
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@@ -150,8 +150,8 @@ github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1
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@@ -163,12 +163,11 @@ github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfn
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@@ -187,57 +186,62 @@ github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXP
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@@ -250,10 +254,8 @@ golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8U
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 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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@@ -264,6 +266,8 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
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+golang.org/x/exp v0.0.0-20230224173230-c95f2b4c22f2 h1:Jvc7gsqn21cJHCmAWx0LiimpP18LZmUxkT5Mp7EZ1mI=
+golang.org/x/exp v0.0.0-20230224173230-c95f2b4c22f2/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
@@ -285,8 +289,8 @@ golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzB
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3 h1:kQgndtyPBW/JIYERgdxfwMYh3AVStj88WQTlNDi2a+o=
-golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3/go.mod h1:3p9vT2HGsQu2K1YbXdKPJLVgG5VJdoTa1poYQBtP1AY=
+golang.org/x/mod v0.7.0 h1:LapD9S96VoQRhi/GrNTqeBJFrUjs5UHCAtTlgwA5oZA=
+golang.org/x/mod v0.7.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -320,14 +324,10 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210525063256-abc453219eb5/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.0.0-20211215060638-4ddde0e984e9/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
 golang.org/x/net v0.0.0-20220225172249-27dd8689420f/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
-golang.org/x/net v0.0.0-20220403103023-749bd193bc2b h1:vI32FkLJNAWtGD4BwkThwEy6XS7ZLLMHkSkYfF8M0W0=
-golang.org/x/net v0.0.0-20220403103023-749bd193bc2b/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
+golang.org/x/net v0.2.0 h1:sZfSu1wtKLGlWI4ZZayP0ck9Y73K1ynO6gqzTdBVdPU=
+golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -345,8 +345,8 @@ golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -361,7 +361,6 @@ golang.org/x/sys v0.0.0-20190606203320-7fc4e5ec1444/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -383,7 +382,6 @@ golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200803210538-64077c9b5642/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201015000850-e3ed0017c211/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201018230417-eeed37f84f13/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -392,16 +390,15 @@ golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211103235746-7861aae1554b/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71 h1:PRD0hj6tTuUnCFD08vkvjkYFbQg/9lV8KIxe1y4/cvU=
-golang.org/x/sys v0.0.0-20220406155245-289d7a0edf71/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
+golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.2.0 h1:z85xZCsEl7bi/KwbNADeBYoOP0++7W1ipu+aGnpwzRM=
+golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -409,7 +406,6 @@ golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.3.8-0.20211105212822-18b340fc7af2/go.mod h1:EFNZuWvGYxIRUEX+K8UmCFwYmZjqcrnq15ZuVldZkZ0=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -456,13 +452,11 @@ golang.org/x/tools v0.0.0-20200804011535-6c149bb5ef0d/go.mod h1:njjCfa9FT2d7l9Bc
 golang.org/x/tools v0.0.0-20200825202427-b303f430e36d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
-golang.org/x/tools v0.1.7/go.mod h1:LGqMHiF4EqQNHR1JncWGqT5BVaXmza+X+BDGol+dOxo=
-golang.org/x/tools v0.1.10 h1:QjFRCZxdOhBJ/UNgnBZLbNV13DlbnK0quyivTnXJM20=
-golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
+golang.org/x/tools v0.3.0 h1:SrNbZl6ECOS1qFzgTdQfWXZM9XBkiA6tkFrH9YSTPHM=
+golang.org/x/tools v0.3.0/go.mod h1:/rWhSS2+zyEVwoJf8YAX6L2f0ntZ7Kn/mGgAWcipA5k=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 h1:Ug9qvr1myri/zFN6xL17LSCBGFDnphBBhzmILHsM5TY=
 golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI=
@@ -543,8 +537,8 @@ google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGj
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
-google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -560,8 +554,9 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

handshake_ix.go

@@ -1,7 +1,6 @@
 package nebula
 
 import (
-	"sync/atomic"
 	"time"
 
 	"github.com/flynn/noise"
@@ -60,7 +59,7 @@ func ixHandshakeStage0(f *Interface, vpnIp iputil.VpnIp, hostinfo *HostInfo) {
 	}
 
 	h := header.Encode(make([]byte, header.Len), header.Version, header.Handshake, header.HandshakeIXPSK0, 0, 1)
-	atomic.AddUint64(&ci.atomicMessageCounter, 1)
+	ci.messageCounter.Add(1)
 
 	msg, _, _, err := ci.H.WriteMessage(h, hsBytes)
 	if err != nil {
@@ -243,9 +242,7 @@ func ixHandshakeStage1(f *Interface, addr *udp.Addr, via interface{}, packet []b
 	hostinfo.SetRemote(addr)
 	hostinfo.CreateRemoteCIDR(remoteCert)
 
-	// Only overwrite existing record if we should win the handshake race
-	overwrite := vpnIp > f.myVpnIp
-	existing, err := f.handshakeManager.CheckAndComplete(hostinfo, 0, overwrite, f)
+	existing, err := f.handshakeManager.CheckAndComplete(hostinfo, 0, f)
 	if err != nil {
 		switch err {
 		case ErrAlreadySeen:
@@ -323,16 +320,6 @@ func ixHandshakeStage1(f *Interface, addr *udp.Addr, via interface{}, packet []b
 				WithField("localIndex", hostinfo.localIndexId).WithField("collision", existing.vpnIp).
 				Error("Failed to add HostInfo due to localIndex collision")
 			return
-		case ErrExistingHandshake:
-			// We have a race where both parties think they are an initiator and this tunnel lost, let the other one finish
-			f.l.WithField("vpnIp", vpnIp).WithField("udpAddr", addr).
-				WithField("certName", certName).
-				WithField("fingerprint", fingerprint).
-				WithField("issuer", issuer).
-				WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
-				WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 1, "style": "ix_psk0"}).
-				Error("Prevented a pending handshake race")
-			return
 		default:
 			// Shouldn't happen, but just in case someone adds a new error type to CheckAndComplete
 			// And we forget to update it here
@@ -394,6 +381,12 @@ func ixHandshakeStage1(f *Interface, addr *udp.Addr, via interface{}, packet []b
 			Info("Handshake message sent")
 	}
 
+	if existing != nil {
+		// Make sure we are tracking the old primary if there was one, it needs to go away eventually
+		f.connectionManager.Out(existing.localIndexId)
+	}
+
+	f.connectionManager.Out(hostinfo.localIndexId)
 	hostinfo.handshakeComplete(f.l, f.cachedPacketMetrics)
 
 	return
@@ -571,8 +564,12 @@ func ixHandshakeStage2(f *Interface, addr *udp.Addr, via interface{}, hostinfo *
 	hostinfo.CreateRemoteCIDR(remoteCert)
 
 	// Complete our handshake and update metrics, this will replace any existing tunnels for this vpnIp
-	//TODO: Complete here does not do a race avoidance, it will just take the new tunnel. Is this ok?
-	f.handshakeManager.Complete(hostinfo, f)
+	existing := f.handshakeManager.Complete(hostinfo, f)
+	if existing != nil {
+		// Make sure we are tracking the old primary if there was one, it needs to go away eventually
+		f.connectionManager.Out(existing.localIndexId)
+	}
+
 	hostinfo.handshakeComplete(f.l, f.cachedPacketMetrics)
 	f.metricHandshakes.Update(duration)
 

handshake_manager.go

@@ -47,7 +47,7 @@ type HandshakeManager struct {
 	lightHouse             *LightHouse
 	outside                *udp.Conn
 	config                 HandshakeConfig
-	OutboundHandshakeTimer *SystemTimerWheel
+	OutboundHandshakeTimer *LockingTimerWheel[iputil.VpnIp]
 	messageMetrics         *MessageMetrics
 	metricInitiated        metrics.Counter
 	metricTimedOut         metrics.Counter
@@ -56,6 +56,10 @@ type HandshakeManager struct {
 	multiPort MultiPortConfig
 	udpRaw    *udp.RawConn
 
+	// vpnIps is another map similar to the pending hostmap but tracks entries in the wheel instead
+	// this is to avoid situations where the same vpn ip enters the wheel and causes rapid fire handshaking
+	vpnIps map[iputil.VpnIp]struct{}
+
 	// can be used to trigger outbound handshake for the given vpnIp
 	trigger chan iputil.VpnIp
 }
@@ -68,7 +72,8 @@ func NewHandshakeManager(l *logrus.Logger, tunCidr *net.IPNet, preferredRanges [
 		outside:                outside,
 		config:                 config,
 		trigger:                make(chan iputil.VpnIp, config.triggerBuffer),
-		OutboundHandshakeTimer: NewSystemTimerWheel(config.tryInterval, hsTimeout(config.retries, config.tryInterval)),
+		OutboundHandshakeTimer: NewLockingTimerWheel[iputil.VpnIp](config.tryInterval, hsTimeout(config.retries, config.tryInterval)),
+		vpnIps:                 map[iputil.VpnIp]struct{}{},
 		messageMetrics:         config.messageMetrics,
 		metricInitiated:        metrics.GetOrRegisterCounter("handshake_manager.initiated", nil),
 		metricTimedOut:         metrics.GetOrRegisterCounter("handshake_manager.timed_out", nil),
@@ -93,13 +98,12 @@ func (c *HandshakeManager) Run(ctx context.Context, f udp.EncWriter) {
 }
 
 func (c *HandshakeManager) NextOutboundHandshakeTimerTick(now time.Time, f udp.EncWriter) {
-	c.OutboundHandshakeTimer.advance(now)
+	c.OutboundHandshakeTimer.Advance(now)
 	for {
-		ep := c.OutboundHandshakeTimer.Purge()
-		if ep == nil {
+		vpnIp, has := c.OutboundHandshakeTimer.Purge()
+		if !has {
 			break
 		}
-		vpnIp := ep.(iputil.VpnIp)
 		c.handleOutbound(vpnIp, f, false)
 	}
 }
@@ -107,6 +111,7 @@ func (c *HandshakeManager) NextOutboundHandshakeTimerTick(now time.Time, f udp.E
 func (c *HandshakeManager) handleOutbound(vpnIp iputil.VpnIp, f udp.EncWriter, lighthouseTriggered bool) {
 	hostinfo, err := c.pendingHostMap.QueryVpnIp(vpnIp)
 	if err != nil {
+		delete(c.vpnIps, vpnIp)
 		return
 	}
 	hostinfo.Lock()
@@ -150,7 +155,7 @@ func (c *HandshakeManager) handleOutbound(vpnIp iputil.VpnIp, f udp.EncWriter, l
 
 	// Get a remotes object if we don't already have one.
 	// This is mainly to protect us as this should never be the case
-	// NB ^ This comment doesn't jive. It's how the thing gets intiailized.
+	// NB ^ This comment doesn't jive. It's how the thing gets initialized.
 	// It's the common path. Should it update every time, in case a future LH query/queries give us more info?
 	if hostinfo.remotes == nil {
 		hostinfo.remotes = c.lightHouse.QueryCache(vpnIp)
@@ -164,7 +169,7 @@ func (c *HandshakeManager) handleOutbound(vpnIp iputil.VpnIp, f udp.EncWriter, l
 		c.lightHouse.QueryServer(vpnIp, f)
 	}
 
-	// Send a the handshake to all known ips, stage 2 takes care of assigning the hostinfo.remote based on the first to reply
+	// Send the handshake to all known ips, stage 2 takes care of assigning the hostinfo.remote based on the first to reply
 	var sentTo []*udp.Addr
 	var sentMultiport bool
 	hostinfo.remotes.ForEach(c.pendingHostMap.preferredRanges, func(addr *udp.Addr, _ bool) {
@@ -287,7 +292,6 @@ func (c *HandshakeManager) handleOutbound(vpnIp iputil.VpnIp, f udp.EncWriter, l
 
 	// If a lighthouse triggered this attempt then we are still in the timer wheel and do not need to re-add
 	if !lighthouseTriggered {
-		//TODO: feel like we dupe handshake real fast in a tight loop, why?
 		c.OutboundHandshakeTimer.Add(vpnIp, c.config.tryInterval*time.Duration(hostinfo.HandshakeCounter))
 	}
 }
@@ -296,7 +300,10 @@ func (c *HandshakeManager) AddVpnIp(vpnIp iputil.VpnIp, init func(*HostInfo)) *H
 	hostinfo, created := c.pendingHostMap.AddVpnIp(vpnIp, init)
 
 	if created {
-		c.OutboundHandshakeTimer.Add(vpnIp, c.config.tryInterval)
+		if _, ok := c.vpnIps[vpnIp]; !ok {
+			c.OutboundHandshakeTimer.Add(vpnIp, c.config.tryInterval)
+		}
+		c.vpnIps[vpnIp] = struct{}{}
 		c.metricInitiated.Inc(1)
 	}
 
@@ -307,7 +314,6 @@ var (
 	ErrExistingHostInfo    = errors.New("existing hostinfo")
 	ErrAlreadySeen         = errors.New("already seen")
 	ErrLocalIndexCollision = errors.New("local index collision")
-	ErrExistingHandshake   = errors.New("existing handshake")
 )
 
 // CheckAndComplete checks for any conflicts in the main and pending hostmap
@@ -321,7 +327,7 @@ var (
 //
 // ErrLocalIndexCollision if we already have an entry in the main or pending
 // hostmap for the hostinfo.localIndexId.
-func (c *HandshakeManager) CheckAndComplete(hostinfo *HostInfo, handshakePacket uint8, overwrite bool, f *Interface) (*HostInfo, error) {
+func (c *HandshakeManager) CheckAndComplete(hostinfo *HostInfo, handshakePacket uint8, f *Interface) (*HostInfo, error) {
 	c.pendingHostMap.Lock()
 	defer c.pendingHostMap.Unlock()
 	c.mainHostMap.Lock()
@@ -330,9 +336,14 @@ func (c *HandshakeManager) CheckAndComplete(hostinfo *HostInfo, handshakePacket
 	// Check if we already have a tunnel with this vpn ip
 	existingHostInfo, found := c.mainHostMap.Hosts[hostinfo.vpnIp]
 	if found && existingHostInfo != nil {
-		// Is it just a delayed handshake packet?
-		if bytes.Equal(hostinfo.HandshakePacket[handshakePacket], existingHostInfo.HandshakePacket[handshakePacket]) {
-			return existingHostInfo, ErrAlreadySeen
+		testHostInfo := existingHostInfo
+		for testHostInfo != nil {
+			// Is it just a delayed handshake packet?
+			if bytes.Equal(hostinfo.HandshakePacket[handshakePacket], existingHostInfo.HandshakePacket[handshakePacket]) {
+				return existingHostInfo, ErrAlreadySeen
+			}
+
+			testHostInfo = testHostInfo.next
 		}
 
 		// Is this a newer handshake?
@@ -364,56 +375,19 @@ func (c *HandshakeManager) CheckAndComplete(hostinfo *HostInfo, handshakePacket
 			Info("New host shadows existing host remoteIndex")
 	}
 
-	// Check if we are also handshaking with this vpn ip
-	pendingHostInfo, found := c.pendingHostMap.Hosts[hostinfo.vpnIp]
-	if found && pendingHostInfo != nil {
-		if !overwrite {
-			// We won, let our pending handshake win
-			return pendingHostInfo, ErrExistingHandshake
-		}
-
-		// We lost, take this handshake and move any cached packets over so they get sent
-		pendingHostInfo.ConnectionState.queueLock.Lock()
-		hostinfo.packetStore = append(hostinfo.packetStore, pendingHostInfo.packetStore...)
-		c.pendingHostMap.unlockedDeleteHostInfo(pendingHostInfo)
-		pendingHostInfo.ConnectionState.queueLock.Unlock()
-		pendingHostInfo.logger(c.l).Info("Handshake race lost, replacing pending handshake with completed tunnel")
-	}
-
-	if existingHostInfo != nil {
-		// We are going to overwrite this entry, so remove the old references
-		delete(c.mainHostMap.Hosts, existingHostInfo.vpnIp)
-		delete(c.mainHostMap.Indexes, existingHostInfo.localIndexId)
-		delete(c.mainHostMap.RemoteIndexes, existingHostInfo.remoteIndexId)
-		for _, relayIdx := range existingHostInfo.relayState.CopyRelayForIdxs() {
-			delete(c.mainHostMap.Relays, relayIdx)
-		}
-	}
-
-	c.mainHostMap.addHostInfo(hostinfo, f)
+	c.mainHostMap.unlockedAddHostInfo(hostinfo, f)
 	return existingHostInfo, nil
 }
 
 // Complete is a simpler version of CheckAndComplete when we already know we
 // won't have a localIndexId collision because we already have an entry in the
-// pendingHostMap
-func (c *HandshakeManager) Complete(hostinfo *HostInfo, f *Interface) {
+// pendingHostMap. An existing hostinfo is returned if there was one.
+func (c *HandshakeManager) Complete(hostinfo *HostInfo, f *Interface) *HostInfo {
 	c.pendingHostMap.Lock()
 	defer c.pendingHostMap.Unlock()
 	c.mainHostMap.Lock()
 	defer c.mainHostMap.Unlock()
 
-	existingHostInfo, found := c.mainHostMap.Hosts[hostinfo.vpnIp]
-	if found && existingHostInfo != nil {
-		// We are going to overwrite this entry, so remove the old references
-		delete(c.mainHostMap.Hosts, existingHostInfo.vpnIp)
-		delete(c.mainHostMap.Indexes, existingHostInfo.localIndexId)
-		delete(c.mainHostMap.RemoteIndexes, existingHostInfo.remoteIndexId)
-		for _, relayIdx := range existingHostInfo.relayState.CopyRelayForIdxs() {
-			delete(c.mainHostMap.Relays, relayIdx)
-		}
-	}
-
 	existingRemoteIndex, found := c.mainHostMap.RemoteIndexes[hostinfo.remoteIndexId]
 	if found && existingRemoteIndex != nil {
 		// We have a collision, but this can happen since we can't control
@@ -423,8 +397,10 @@ func (c *HandshakeManager) Complete(hostinfo *HostInfo, f *Interface) {
 			Info("New host shadows existing host remoteIndex")
 	}
 
-	c.mainHostMap.addHostInfo(hostinfo, f)
+	existingHostInfo := c.mainHostMap.Hosts[hostinfo.vpnIp]
+	c.mainHostMap.unlockedAddHostInfo(hostinfo, f)
 	c.pendingHostMap.unlockedDeleteHostInfo(hostinfo)
+	return existingHostInfo
 }
 
 // AddIndexHostInfo generates a unique localIndexId for this HostInfo

handshake_manager_test.go

@@ -21,11 +21,7 @@ func Test_NewHandshakeManagerVpnIp(t *testing.T) {
 	preferredRanges := []*net.IPNet{localrange}
 	mw := &mockEncWriter{}
 	mainHM := NewHostMap(l, "test", vpncidr, preferredRanges)
-	lh := &LightHouse{
-		atomicStaticList:  make(map[iputil.VpnIp]struct{}),
-		atomicLighthouses: make(map[iputil.VpnIp]struct{}),
-		addrMap:           make(map[iputil.VpnIp]*RemoteList),
-	}
+	lh := newTestLighthouse()
 
 	blah := NewHandshakeManager(l, tuncidr, preferredRanges, mainHM, lh, &udp.Conn{}, defaultHandshakeConfig)
 
@@ -79,12 +75,7 @@ func Test_NewHandshakeManagerTrigger(t *testing.T) {
 	preferredRanges := []*net.IPNet{localrange}
 	mw := &mockEncWriter{}
 	mainHM := NewHostMap(l, "test", vpncidr, preferredRanges)
-	lh := &LightHouse{
-		addrMap:           make(map[iputil.VpnIp]*RemoteList),
-		l:                 l,
-		atomicStaticList:  make(map[iputil.VpnIp]struct{}),
-		atomicLighthouses: make(map[iputil.VpnIp]struct{}),
-	}
+	lh := newTestLighthouse()
 
 	blah := NewHandshakeManager(l, tuncidr, preferredRanges, mainHM, lh, &udp.Conn{}, defaultHandshakeConfig)
 
@@ -115,8 +106,8 @@ func Test_NewHandshakeManagerTrigger(t *testing.T) {
 	assert.Equal(t, 1, testCountTimerWheelEntries(blah.OutboundHandshakeTimer))
 }
 
-func testCountTimerWheelEntries(tw *SystemTimerWheel) (c int) {
-	for _, i := range tw.wheel {
+func testCountTimerWheelEntries(tw *LockingTimerWheel[iputil.VpnIp]) (c int) {
+	for _, i := range tw.t.wheel {
 		n := i.Head
 		for n != nil {
 			c++

hostmap.go

@@ -18,11 +18,15 @@ import (
 	"github.com/slackhq/nebula/udp"
 )
 
-//const ProbeLen = 100
+// const ProbeLen = 100
 const PromoteEvery = 1000
 const ReQueryEvery = 5000
 const MaxRemotes = 10
 
+// MaxHostInfosPerVpnIp is the max number of hostinfos we will track for a given vpn ip
+// 5 allows for an initial handshake and each host pair re-handshaking twice
+const MaxHostInfosPerVpnIp = 5
+
 // How long we should prevent roaming back to the previous IP.
 // This helps prevent flapping due to packets already in flight
 const RoamingSuppressSeconds = 2
@@ -153,7 +157,7 @@ type HostInfo struct {
 
 	remote            *udp.Addr
 	remotes           *RemoteList
-	promoteCounter    uint32
+	promoteCounter    atomic.Uint32
 	multiportTx       bool
 	multiportRx       bool
 	ConnectionState   *ConnectionState
@@ -182,6 +186,10 @@ type HostInfo struct {
 
 	lastRoam       time.Time
 	lastRoamRemote *udp.Addr
+
+	// Used to track other hostinfos for this vpn ip since only 1 can be primary
+	// Synchronised via hostmap lock and not the hostinfo lock.
+	next, prev *HostInfo
 }
 
 type ViaSender struct {
@@ -286,7 +294,6 @@ func (hm *HostMap) AddVpnIp(vpnIp iputil.VpnIp, init func(hostinfo *HostInfo)) (
 	if h, ok := hm.Hosts[vpnIp]; !ok {
 		hm.RUnlock()
 		h = &HostInfo{
-			promoteCounter:  0,
 			vpnIp:           vpnIp,
 			HandshakePacket: make(map[uint8][]byte, 0),
 			relayState: RelayState{
@@ -398,9 +405,12 @@ func (hm *HostMap) DeleteReverseIndex(index uint32) {
 	}
 }
 
-func (hm *HostMap) DeleteHostInfo(hostinfo *HostInfo) {
+// DeleteHostInfo will fully unlink the hostinfo and return true if it was the final hostinfo for this vpn ip
+func (hm *HostMap) DeleteHostInfo(hostinfo *HostInfo) bool {
 	// Delete the host itself, ensuring it's not modified anymore
 	hm.Lock()
+	// If we have a previous or next hostinfo then we are not the last one for this vpn ip
+	final := (hostinfo.next == nil && hostinfo.prev == nil)
 	hm.unlockedDeleteHostInfo(hostinfo)
 	hm.Unlock()
 
@@ -424,6 +434,8 @@ func (hm *HostMap) DeleteHostInfo(hostinfo *HostInfo) {
 	for _, localIdx := range teardownRelayIdx {
 		hm.RemoveRelay(localIdx)
 	}
+
+	return final
 }
 
 func (hm *HostMap) DeleteRelayIdx(localIdx uint32) {
@@ -432,29 +444,81 @@ func (hm *HostMap) DeleteRelayIdx(localIdx uint32) {
 	delete(hm.RemoteIndexes, localIdx)
 }
 
-func (hm *HostMap) unlockedDeleteHostInfo(hostinfo *HostInfo) {
-	// Check if this same hostId is in the hostmap with a different instance.
-	// This could happen if we have an entry in the pending hostmap with different
-	// index values than the one in the main hostmap.
-	hostinfo2, ok := hm.Hosts[hostinfo.vpnIp]
-	if ok && hostinfo2 != hostinfo {
-		delete(hm.Hosts, hostinfo2.vpnIp)
-		delete(hm.Indexes, hostinfo2.localIndexId)
-		delete(hm.RemoteIndexes, hostinfo2.remoteIndexId)
+func (hm *HostMap) MakePrimary(hostinfo *HostInfo) {
+	hm.Lock()
+	defer hm.Unlock()
+	hm.unlockedMakePrimary(hostinfo)
+}
+
+func (hm *HostMap) unlockedMakePrimary(hostinfo *HostInfo) {
+	oldHostinfo := hm.Hosts[hostinfo.vpnIp]
+	if oldHostinfo == hostinfo {
+		return
 	}
 
-	delete(hm.Hosts, hostinfo.vpnIp)
-	if len(hm.Hosts) == 0 {
-		hm.Hosts = map[iputil.VpnIp]*HostInfo{}
+	if hostinfo.prev != nil {
+		hostinfo.prev.next = hostinfo.next
 	}
+
+	if hostinfo.next != nil {
+		hostinfo.next.prev = hostinfo.prev
+	}
+
+	hm.Hosts[hostinfo.vpnIp] = hostinfo
+
+	if oldHostinfo == nil {
+		return
+	}
+
+	hostinfo.next = oldHostinfo
+	oldHostinfo.prev = hostinfo
+	hostinfo.prev = nil
+}
+
+func (hm *HostMap) unlockedDeleteHostInfo(hostinfo *HostInfo) {
+	primary, ok := hm.Hosts[hostinfo.vpnIp]
+	if ok && primary == hostinfo {
+		// The vpnIp pointer points to the same hostinfo as the local index id, we can remove it
+		delete(hm.Hosts, hostinfo.vpnIp)
+		if len(hm.Hosts) == 0 {
+			hm.Hosts = map[iputil.VpnIp]*HostInfo{}
+		}
+
+		if hostinfo.next != nil {
+			// We had more than 1 hostinfo at this vpnip, promote the next in the list to primary
+			hm.Hosts[hostinfo.vpnIp] = hostinfo.next
+			// It is primary, there is no previous hostinfo now
+			hostinfo.next.prev = nil
+		}
+
+	} else {
+		// Relink if we were in the middle of multiple hostinfos for this vpn ip
+		if hostinfo.prev != nil {
+			hostinfo.prev.next = hostinfo.next
+		}
+
+		if hostinfo.next != nil {
+			hostinfo.next.prev = hostinfo.prev
+		}
+	}
+
+	hostinfo.next = nil
+	hostinfo.prev = nil
+
+	// The remote index uses index ids outside our control so lets make sure we are only removing
+	// the remote index pointer here if it points to the hostinfo we are deleting
+	hostinfo2, ok := hm.RemoteIndexes[hostinfo.remoteIndexId]
+	if ok && hostinfo2 == hostinfo {
+		delete(hm.RemoteIndexes, hostinfo.remoteIndexId)
+		if len(hm.RemoteIndexes) == 0 {
+			hm.RemoteIndexes = map[uint32]*HostInfo{}
+		}
+	}
+
 	delete(hm.Indexes, hostinfo.localIndexId)
 	if len(hm.Indexes) == 0 {
 		hm.Indexes = map[uint32]*HostInfo{}
 	}
-	delete(hm.RemoteIndexes, hostinfo.remoteIndexId)
-	if len(hm.RemoteIndexes) == 0 {
-		hm.RemoteIndexes = map[uint32]*HostInfo{}
-	}
 
 	if hm.l.Level >= logrus.DebugLevel {
 		hm.l.WithField("hostMap", m{"mapName": hm.name, "mapTotalSize": len(hm.Hosts),
@@ -523,15 +587,22 @@ func (hm *HostMap) queryVpnIp(vpnIp iputil.VpnIp, promoteIfce *Interface) (*Host
 	return nil, errors.New("unable to find host")
 }
 
-// We already have the hm Lock when this is called, so make sure to not call
-// any other methods that might try to grab it again
-func (hm *HostMap) addHostInfo(hostinfo *HostInfo, f *Interface) {
+// unlockedAddHostInfo assumes you have a write-lock and will add a hostinfo object to the hostmap Indexes and RemoteIndexes maps.
+// If an entry exists for the Hosts table (vpnIp -> hostinfo) then the provided hostinfo will be made primary
+func (hm *HostMap) unlockedAddHostInfo(hostinfo *HostInfo, f *Interface) {
 	if f.serveDns {
 		remoteCert := hostinfo.ConnectionState.peerCert
 		dnsR.Add(remoteCert.Details.Name+".", remoteCert.Details.Ips[0].IP.String())
 	}
 
+	existing := hm.Hosts[hostinfo.vpnIp]
 	hm.Hosts[hostinfo.vpnIp] = hostinfo
+
+	if existing != nil {
+		hostinfo.next = existing
+		existing.prev = hostinfo
+	}
+
 	hm.Indexes[hostinfo.localIndexId] = hostinfo
 	hm.RemoteIndexes[hostinfo.remoteIndexId] = hostinfo
 
@@ -540,6 +611,16 @@ func (hm *HostMap) addHostInfo(hostinfo *HostInfo, f *Interface) {
 			"hostinfo": m{"existing": true, "localIndexId": hostinfo.localIndexId, "hostId": hostinfo.vpnIp}}).
 			Debug("Hostmap vpnIp added")
 	}
+
+	i := 1
+	check := hostinfo
+	for check != nil {
+		if i > MaxHostInfosPerVpnIp {
+			hm.unlockedDeleteHostInfo(check)
+		}
+		check = check.next
+		i++
+	}
 }
 
 // punchList assembles a list of all non nil RemoteList pointer entries in this hostmap
@@ -593,7 +674,7 @@ func (hm *HostMap) Punchy(ctx context.Context, conn *udp.Conn) {
 // TryPromoteBest handles re-querying lighthouses and probing for better paths
 // NOTE: It is an error to call this if you are a lighthouse since they should not roam clients!
 func (i *HostInfo) TryPromoteBest(preferredRanges []*net.IPNet, ifce *Interface) {
-	c := atomic.AddUint32(&i.promoteCounter, 1)
+	c := i.promoteCounter.Add(1)
 	if c%PromoteEvery == 0 {
 		// The lock here is currently protecting i.remote access
 		i.RLock()
@@ -660,7 +741,7 @@ func (i *HostInfo) handshakeComplete(l *logrus.Logger, m *cachedPacketMetrics) {
 	i.HandshakeComplete = true
 	//TODO: this should be managed by the handshake state machine to set it based on how many handshake were seen.
 	// Clamping it to 2 gets us out of the woods for now
-	atomic.StoreUint64(&i.ConnectionState.atomicMessageCounter, 2)
+	i.ConnectionState.messageCounter.Store(2)
 
 	if l.Level >= logrus.DebugLevel {
 		i.logger(l).Debugf("Sending %d stored packets", len(i.packetStore))
@@ -767,7 +848,10 @@ func (i *HostInfo) logger(l *logrus.Logger) *logrus.Entry {
 		return logrus.NewEntry(l)
 	}
 
-	li := l.WithField("vpnIp", i.vpnIp)
+	li := l.WithField("vpnIp", i.vpnIp).
+		WithField("localIndex", i.localIndexId).
+		WithField("remoteIndex", i.remoteIndexId)
+
 	if connState := i.ConnectionState; connState != nil {
 		if peerCert := connState.peerCert; peerCert != nil {
 			li = li.WithField("certName", peerCert.Details.Name)

hostmap_test.go

@@ -1 +1,207 @@
 package nebula
+
+import (
+	"net"
+	"testing"
+
+	"github.com/slackhq/nebula/test"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestHostMap_MakePrimary(t *testing.T) {
+	l := test.NewLogger()
+	hm := NewHostMap(
+		l, "test",
+		&net.IPNet{
+			IP:   net.IP{10, 0, 0, 1},
+			Mask: net.IPMask{255, 255, 255, 0},
+		},
+		[]*net.IPNet{},
+	)
+
+	f := &Interface{}
+
+	h1 := &HostInfo{vpnIp: 1, localIndexId: 1}
+	h2 := &HostInfo{vpnIp: 1, localIndexId: 2}
+	h3 := &HostInfo{vpnIp: 1, localIndexId: 3}
+	h4 := &HostInfo{vpnIp: 1, localIndexId: 4}
+
+	hm.unlockedAddHostInfo(h4, f)
+	hm.unlockedAddHostInfo(h3, f)
+	hm.unlockedAddHostInfo(h2, f)
+	hm.unlockedAddHostInfo(h1, f)
+
+	// Make sure we go h1 -> h2 -> h3 -> h4
+	prim, _ := hm.QueryVpnIp(1)
+	assert.Equal(t, h1.localIndexId, prim.localIndexId)
+	assert.Equal(t, h2.localIndexId, prim.next.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Equal(t, h1.localIndexId, h2.prev.localIndexId)
+	assert.Equal(t, h3.localIndexId, h2.next.localIndexId)
+	assert.Equal(t, h2.localIndexId, h3.prev.localIndexId)
+	assert.Equal(t, h4.localIndexId, h3.next.localIndexId)
+	assert.Equal(t, h3.localIndexId, h4.prev.localIndexId)
+	assert.Nil(t, h4.next)
+
+	// Swap h3/middle to primary
+	hm.MakePrimary(h3)
+
+	// Make sure we go h3 -> h1 -> h2 -> h4
+	prim, _ = hm.QueryVpnIp(1)
+	assert.Equal(t, h3.localIndexId, prim.localIndexId)
+	assert.Equal(t, h1.localIndexId, prim.next.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Equal(t, h2.localIndexId, h1.next.localIndexId)
+	assert.Equal(t, h3.localIndexId, h1.prev.localIndexId)
+	assert.Equal(t, h4.localIndexId, h2.next.localIndexId)
+	assert.Equal(t, h1.localIndexId, h2.prev.localIndexId)
+	assert.Equal(t, h2.localIndexId, h4.prev.localIndexId)
+	assert.Nil(t, h4.next)
+
+	// Swap h4/tail to primary
+	hm.MakePrimary(h4)
+
+	// Make sure we go h4 -> h3 -> h1 -> h2
+	prim, _ = hm.QueryVpnIp(1)
+	assert.Equal(t, h4.localIndexId, prim.localIndexId)
+	assert.Equal(t, h3.localIndexId, prim.next.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Equal(t, h1.localIndexId, h3.next.localIndexId)
+	assert.Equal(t, h4.localIndexId, h3.prev.localIndexId)
+	assert.Equal(t, h2.localIndexId, h1.next.localIndexId)
+	assert.Equal(t, h3.localIndexId, h1.prev.localIndexId)
+	assert.Equal(t, h1.localIndexId, h2.prev.localIndexId)
+	assert.Nil(t, h2.next)
+
+	// Swap h4 again should be no-op
+	hm.MakePrimary(h4)
+
+	// Make sure we go h4 -> h3 -> h1 -> h2
+	prim, _ = hm.QueryVpnIp(1)
+	assert.Equal(t, h4.localIndexId, prim.localIndexId)
+	assert.Equal(t, h3.localIndexId, prim.next.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Equal(t, h1.localIndexId, h3.next.localIndexId)
+	assert.Equal(t, h4.localIndexId, h3.prev.localIndexId)
+	assert.Equal(t, h2.localIndexId, h1.next.localIndexId)
+	assert.Equal(t, h3.localIndexId, h1.prev.localIndexId)
+	assert.Equal(t, h1.localIndexId, h2.prev.localIndexId)
+	assert.Nil(t, h2.next)
+}
+
+func TestHostMap_DeleteHostInfo(t *testing.T) {
+	l := test.NewLogger()
+	hm := NewHostMap(
+		l, "test",
+		&net.IPNet{
+			IP:   net.IP{10, 0, 0, 1},
+			Mask: net.IPMask{255, 255, 255, 0},
+		},
+		[]*net.IPNet{},
+	)
+
+	f := &Interface{}
+
+	h1 := &HostInfo{vpnIp: 1, localIndexId: 1}
+	h2 := &HostInfo{vpnIp: 1, localIndexId: 2}
+	h3 := &HostInfo{vpnIp: 1, localIndexId: 3}
+	h4 := &HostInfo{vpnIp: 1, localIndexId: 4}
+	h5 := &HostInfo{vpnIp: 1, localIndexId: 5}
+	h6 := &HostInfo{vpnIp: 1, localIndexId: 6}
+
+	hm.unlockedAddHostInfo(h6, f)
+	hm.unlockedAddHostInfo(h5, f)
+	hm.unlockedAddHostInfo(h4, f)
+	hm.unlockedAddHostInfo(h3, f)
+	hm.unlockedAddHostInfo(h2, f)
+	hm.unlockedAddHostInfo(h1, f)
+
+	// h6 should be deleted
+	assert.Nil(t, h6.next)
+	assert.Nil(t, h6.prev)
+	_, err := hm.QueryIndex(h6.localIndexId)
+	assert.Error(t, err)
+
+	// Make sure we go h1 -> h2 -> h3 -> h4 -> h5
+	prim, _ := hm.QueryVpnIp(1)
+	assert.Equal(t, h1.localIndexId, prim.localIndexId)
+	assert.Equal(t, h2.localIndexId, prim.next.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Equal(t, h1.localIndexId, h2.prev.localIndexId)
+	assert.Equal(t, h3.localIndexId, h2.next.localIndexId)
+	assert.Equal(t, h2.localIndexId, h3.prev.localIndexId)
+	assert.Equal(t, h4.localIndexId, h3.next.localIndexId)
+	assert.Equal(t, h3.localIndexId, h4.prev.localIndexId)
+	assert.Equal(t, h5.localIndexId, h4.next.localIndexId)
+	assert.Equal(t, h4.localIndexId, h5.prev.localIndexId)
+	assert.Nil(t, h5.next)
+
+	// Delete primary
+	hm.DeleteHostInfo(h1)
+	assert.Nil(t, h1.prev)
+	assert.Nil(t, h1.next)
+
+	// Make sure we go h2 -> h3 -> h4 -> h5
+	prim, _ = hm.QueryVpnIp(1)
+	assert.Equal(t, h2.localIndexId, prim.localIndexId)
+	assert.Equal(t, h3.localIndexId, prim.next.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Equal(t, h3.localIndexId, h2.next.localIndexId)
+	assert.Equal(t, h2.localIndexId, h3.prev.localIndexId)
+	assert.Equal(t, h4.localIndexId, h3.next.localIndexId)
+	assert.Equal(t, h3.localIndexId, h4.prev.localIndexId)
+	assert.Equal(t, h5.localIndexId, h4.next.localIndexId)
+	assert.Equal(t, h4.localIndexId, h5.prev.localIndexId)
+	assert.Nil(t, h5.next)
+
+	// Delete in the middle
+	hm.DeleteHostInfo(h3)
+	assert.Nil(t, h3.prev)
+	assert.Nil(t, h3.next)
+
+	// Make sure we go h2 -> h4 -> h5
+	prim, _ = hm.QueryVpnIp(1)
+	assert.Equal(t, h2.localIndexId, prim.localIndexId)
+	assert.Equal(t, h4.localIndexId, prim.next.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Equal(t, h4.localIndexId, h2.next.localIndexId)
+	assert.Equal(t, h2.localIndexId, h4.prev.localIndexId)
+	assert.Equal(t, h5.localIndexId, h4.next.localIndexId)
+	assert.Equal(t, h4.localIndexId, h5.prev.localIndexId)
+	assert.Nil(t, h5.next)
+
+	// Delete the tail
+	hm.DeleteHostInfo(h5)
+	assert.Nil(t, h5.prev)
+	assert.Nil(t, h5.next)
+
+	// Make sure we go h2 -> h4
+	prim, _ = hm.QueryVpnIp(1)
+	assert.Equal(t, h2.localIndexId, prim.localIndexId)
+	assert.Equal(t, h4.localIndexId, prim.next.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Equal(t, h4.localIndexId, h2.next.localIndexId)
+	assert.Equal(t, h2.localIndexId, h4.prev.localIndexId)
+	assert.Nil(t, h4.next)
+
+	// Delete the head
+	hm.DeleteHostInfo(h2)
+	assert.Nil(t, h2.prev)
+	assert.Nil(t, h2.next)
+
+	// Make sure we only have h4
+	prim, _ = hm.QueryVpnIp(1)
+	assert.Equal(t, h4.localIndexId, prim.localIndexId)
+	assert.Nil(t, prim.prev)
+	assert.Nil(t, prim.next)
+	assert.Nil(t, h4.next)
+
+	// Delete the only item
+	hm.DeleteHostInfo(h4)
+	assert.Nil(t, h4.prev)
+	assert.Nil(t, h4.next)
+
+	// Make sure we have nil
+	prim, _ = hm.QueryVpnIp(1)
+	assert.Nil(t, prim)
+}

hostmap_tester.go

@@ -0,0 +1,24 @@
+//go:build e2e_testing
+// +build e2e_testing
+
+package nebula
+
+// This file contains functions used to export information to the e2e testing framework
+
+import "github.com/slackhq/nebula/iputil"
+
+func (i *HostInfo) GetVpnIp() iputil.VpnIp {
+	return i.vpnIp
+}
+
+func (i *HostInfo) GetLocalIndex() uint32 {
+	return i.localIndexId
+}
+
+func (i *HostInfo) GetRemoteIndex() uint32 {
+	return i.remoteIndexId
+}
+
+func (i *HostInfo) GetRelayState() RelayState {
+	return i.relayState
+}

inside.go

@@ -1,8 +1,6 @@
 package nebula
 
 import (
-	"sync/atomic"
-
 	"github.com/flynn/noise"
 	"github.com/sirupsen/logrus"
 	"github.com/slackhq/nebula/firewall"
@@ -27,8 +25,9 @@ func (f *Interface) consumeInsidePacket(packet []byte, fwPacket *firewall.Packet
 
 	if fwPacket.RemoteIP == f.myVpnIp {
 		// Immediately forward packets from self to self.
-		// This should only happen on Darwin-based hosts, which routes packets from
-		// the Nebula IP to the Nebula IP through the Nebula TUN device.
+		// This should only happen on Darwin-based and FreeBSD hosts, which
+		// routes packets from the Nebula IP to the Nebula IP through the Nebula
+		// TUN device.
 		if immediatelyForwardToSelf {
 			_, err := f.readers[q].Write(packet)
 			if err != nil {
@@ -222,10 +221,10 @@ func (f *Interface) SendVia(viaIfc interface{},
 ) {
 	via := viaIfc.(*HostInfo)
 	relay := relayIfc.(*Relay)
-	c := atomic.AddUint64(&via.ConnectionState.atomicMessageCounter, 1)
+	c := via.ConnectionState.messageCounter.Add(1)
 
 	out = header.Encode(out, header.Version, header.Message, header.MessageRelay, relay.RemoteIndex, c)
-	f.connectionManager.Out(via.vpnIp)
+	f.connectionManager.Out(via.localIndexId)
 
 	// Authenticate the header and payload, but do not encrypt for this message type.
 	// The payload consists of the inner, unencrypted Nebula header, as well as the end-to-end encrypted payload.
@@ -298,11 +297,11 @@ func (f *Interface) sendNoMetrics(t header.MessageType, st header.MessageSubType
 
 	//TODO: enable if we do more than 1 tun queue
 	//ci.writeLock.Lock()
-	c := atomic.AddUint64(&ci.atomicMessageCounter, 1)
+	c := ci.messageCounter.Add(1)
 
 	//l.WithField("trace", string(debug.Stack())).Error("out Header ", &Header{Version, t, st, 0, hostinfo.remoteIndexId, c}, p)
 	out = header.Encode(out, header.Version, t, st, hostinfo.remoteIndexId, c)
-	f.connectionManager.Out(hostinfo.vpnIp)
+	f.connectionManager.Out(hostinfo.localIndexId)
 
 	// Query our LH if we haven't since the last time we've been rebound, this will cause the remote to punch against
 	// all our IPs and enable a faster roaming.

inside_bsd.go

@@ -0,0 +1,6 @@
+//go:build darwin || dragonfly || freebsd || netbsd || openbsd
+// +build darwin dragonfly freebsd netbsd openbsd
+
+package nebula
+
+const immediatelyForwardToSelf bool = true

inside_darwin.go

@@ -1,3 +0,0 @@
-package nebula
-
-const immediatelyForwardToSelf bool = true

inside_generic.go

@@ -1,5 +1,5 @@
-//go:build !darwin
-// +build !darwin
+//go:build !darwin && !dragonfly && !freebsd && !netbsd && !openbsd
+// +build !darwin,!dragonfly,!freebsd,!netbsd,!openbsd
 
 package nebula
 

interface.go

@@ -67,7 +67,7 @@ type Interface struct {
 	routines           int
 	caPool             *cert.NebulaCAPool
 	disconnectInvalid  bool
-	closed             int32
+	closed             atomic.Bool
 	relayManager       *relayManager
 
 	sendRecvErrorConfig sendRecvErrorConfig
@@ -267,7 +267,7 @@ func (f *Interface) listenIn(reader io.ReadWriteCloser, i int) {
 	for {
 		n, err := reader.Read(packet)
 		if err != nil {
-			if errors.Is(err, os.ErrClosed) && atomic.LoadInt32(&f.closed) != 0 {
+			if errors.Is(err, os.ErrClosed) && f.closed.Load() {
 				return
 			}
 
@@ -413,7 +413,7 @@ func (f *Interface) emitStats(ctx context.Context, i time.Duration) {
 }
 
 func (f *Interface) Close() error {
-	atomic.StoreInt32(&f.closed, 1)
+	f.closed.Store(true)
 
 	// Release the tun device
 	return f.inside.Close()

lighthouse.go

@@ -9,7 +9,6 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
-	"unsafe"
 
 	"github.com/rcrowley/go-metrics"
 	"github.com/sirupsen/logrus"
@@ -49,29 +48,29 @@ type LightHouse struct {
 	// respond with.
 	// - When we are not a lighthouse, this filters which addresses we accept
 	// from lighthouses.
-	atomicRemoteAllowList *RemoteAllowList
+	remoteAllowList atomic.Pointer[RemoteAllowList]
 
 	// filters local addresses that we advertise to lighthouses
-	atomicLocalAllowList *LocalAllowList
+	localAllowList atomic.Pointer[LocalAllowList]
 
 	// used to trigger the HandshakeManager when we receive HostQueryReply
 	handshakeTrigger chan<- iputil.VpnIp
 
-	// atomicStaticList exists to avoid having a bool in each addrMap entry
+	// staticList exists to avoid having a bool in each addrMap entry
 	// since static should be rare
-	atomicStaticList  map[iputil.VpnIp]struct{}
-	atomicLighthouses map[iputil.VpnIp]struct{}
+	staticList  atomic.Pointer[map[iputil.VpnIp]struct{}]
+	lighthouses atomic.Pointer[map[iputil.VpnIp]struct{}]
 
-	atomicInterval  int64
+	interval        atomic.Int64
 	updateCancel    context.CancelFunc
 	updateParentCtx context.Context
 	updateUdp       udp.EncWriter
 	nebulaPort      uint32 // 32 bits because protobuf does not have a uint16
 
-	atomicAdvertiseAddrs []netIpAndPort
+	advertiseAddrs atomic.Pointer[[]netIpAndPort]
 
 	// IP's of relays that can be used by peers to access me
-	atomicRelaysForMe []iputil.VpnIp
+	relaysForMe atomic.Pointer[[]iputil.VpnIp]
 
 	metrics           *MessageMetrics
 	metricHolepunchTx metrics.Counter
@@ -98,18 +97,20 @@ func NewLightHouseFromConfig(l *logrus.Logger, c *config.C, myVpnNet *net.IPNet,
 
 	ones, _ := myVpnNet.Mask.Size()
 	h := LightHouse{
-		amLighthouse:      amLighthouse,
-		myVpnIp:           iputil.Ip2VpnIp(myVpnNet.IP),
-		myVpnZeros:        iputil.VpnIp(32 - ones),
-		myVpnNet:          myVpnNet,
-		addrMap:           make(map[iputil.VpnIp]*RemoteList),
-		nebulaPort:        nebulaPort,
-		atomicLighthouses: make(map[iputil.VpnIp]struct{}),
-		atomicStaticList:  make(map[iputil.VpnIp]struct{}),
-		punchConn:         pc,
-		punchy:            p,
-		l:                 l,
+		amLighthouse: amLighthouse,
+		myVpnIp:      iputil.Ip2VpnIp(myVpnNet.IP),
+		myVpnZeros:   iputil.VpnIp(32 - ones),
+		myVpnNet:     myVpnNet,
+		addrMap:      make(map[iputil.VpnIp]*RemoteList),
+		nebulaPort:   nebulaPort,
+		punchConn:    pc,
+		punchy:       p,
+		l:            l,
 	}
+	lighthouses := make(map[iputil.VpnIp]struct{})
+	h.lighthouses.Store(&lighthouses)
+	staticList := make(map[iputil.VpnIp]struct{})
+	h.staticList.Store(&staticList)
 
 	if c.GetBool("stats.lighthouse_metrics", false) {
 		h.metrics = newLighthouseMetrics()
@@ -137,31 +138,31 @@ func NewLightHouseFromConfig(l *logrus.Logger, c *config.C, myVpnNet *net.IPNet,
 }
 
 func (lh *LightHouse) GetStaticHostList() map[iputil.VpnIp]struct{} {
-	return *(*map[iputil.VpnIp]struct{})(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicStaticList))))
+	return *lh.staticList.Load()
 }
 
 func (lh *LightHouse) GetLighthouses() map[iputil.VpnIp]struct{} {
-	return *(*map[iputil.VpnIp]struct{})(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicLighthouses))))
+	return *lh.lighthouses.Load()
 }
 
 func (lh *LightHouse) GetRemoteAllowList() *RemoteAllowList {
-	return (*RemoteAllowList)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicRemoteAllowList))))
+	return lh.remoteAllowList.Load()
 }
 
 func (lh *LightHouse) GetLocalAllowList() *LocalAllowList {
-	return (*LocalAllowList)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicLocalAllowList))))
+	return lh.localAllowList.Load()
 }
 
 func (lh *LightHouse) GetAdvertiseAddrs() []netIpAndPort {
-	return *(*[]netIpAndPort)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicAdvertiseAddrs))))
+	return *lh.advertiseAddrs.Load()
 }
 
 func (lh *LightHouse) GetRelaysForMe() []iputil.VpnIp {
-	return *(*[]iputil.VpnIp)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicRelaysForMe))))
+	return *lh.relaysForMe.Load()
 }
 
 func (lh *LightHouse) GetUpdateInterval() int64 {
-	return atomic.LoadInt64(&lh.atomicInterval)
+	return lh.interval.Load()
 }
 
 func (lh *LightHouse) reload(c *config.C, initial bool) error {
@@ -188,7 +189,7 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 			advAddrs = append(advAddrs, netIpAndPort{ip: fIp, port: fPort})
 		}
 
-		atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicAdvertiseAddrs)), unsafe.Pointer(&advAddrs))
+		lh.advertiseAddrs.Store(&advAddrs)
 
 		if !initial {
 			lh.l.Info("lighthouse.advertise_addrs has changed")
@@ -196,10 +197,10 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 	}
 
 	if initial || c.HasChanged("lighthouse.interval") {
-		atomic.StoreInt64(&lh.atomicInterval, int64(c.GetInt("lighthouse.interval", 10)))
+		lh.interval.Store(int64(c.GetInt("lighthouse.interval", 10)))
 
 		if !initial {
-			lh.l.Infof("lighthouse.interval changed to %v", lh.atomicInterval)
+			lh.l.Infof("lighthouse.interval changed to %v", lh.interval.Load())
 
 			if lh.updateCancel != nil {
 				// May not always have a running routine
@@ -216,7 +217,7 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 			return util.NewContextualError("Invalid lighthouse.remote_allow_list", nil, err)
 		}
 
-		atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicRemoteAllowList)), unsafe.Pointer(ral))
+		lh.remoteAllowList.Store(ral)
 		if !initial {
 			//TODO: a diff will be annoyingly difficult
 			lh.l.Info("lighthouse.remote_allow_list and/or lighthouse.remote_allow_ranges has changed")
@@ -229,7 +230,7 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 			return util.NewContextualError("Invalid lighthouse.local_allow_list", nil, err)
 		}
 
-		atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicLocalAllowList)), unsafe.Pointer(lal))
+		lh.localAllowList.Store(lal)
 		if !initial {
 			//TODO: a diff will be annoyingly difficult
 			lh.l.Info("lighthouse.local_allow_list has changed")
@@ -244,7 +245,7 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 			return err
 		}
 
-		atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicStaticList)), unsafe.Pointer(&staticList))
+		lh.staticList.Store(&staticList)
 		if !initial {
 			//TODO: we should remove any remote list entries for static hosts that were removed/modified?
 			lh.l.Info("static_host_map has changed")
@@ -259,7 +260,7 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 			return err
 		}
 
-		atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicLighthouses)), unsafe.Pointer(&lhMap))
+		lh.lighthouses.Store(&lhMap)
 		if !initial {
 			//NOTE: we are not tearing down existing lighthouse connections because they might be used for non lighthouse traffic
 			lh.l.Info("lighthouse.hosts has changed")
@@ -274,7 +275,7 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 				lh.l.Info("Ignoring relays from config because am_relay is true")
 			}
 			relaysForMe := []iputil.VpnIp{}
-			atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicRelaysForMe)), unsafe.Pointer(&relaysForMe))
+			lh.relaysForMe.Store(&relaysForMe)
 		case false:
 			relaysForMe := []iputil.VpnIp{}
 			for _, v := range c.GetStringSlice("relay.relays", nil) {
@@ -285,7 +286,7 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 					relaysForMe = append(relaysForMe, iputil.Ip2VpnIp(configRIP))
 				}
 			}
-			atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&lh.atomicRelaysForMe)), unsafe.Pointer(&relaysForMe))
+			lh.relaysForMe.Store(&relaysForMe)
 		}
 	}
 
@@ -460,7 +461,7 @@ func (lh *LightHouse) DeleteVpnIp(vpnIp iputil.VpnIp) {
 // AddStaticRemote adds a static host entry for vpnIp as ourselves as the owner
 // We are the owner because we don't want a lighthouse server to advertise for static hosts it was configured with
 // And we don't want a lighthouse query reply to interfere with our learned cache if we are a client
-//NOTE: this function should not interact with any hot path objects, like lh.staticList, the caller should handle it
+// NOTE: this function should not interact with any hot path objects, like lh.staticList, the caller should handle it
 func (lh *LightHouse) addStaticRemote(vpnIp iputil.VpnIp, toAddr *udp.Addr, staticList map[iputil.VpnIp]struct{}) {
 	lh.Lock()
 	am := lh.unlockedGetRemoteList(vpnIp)

main.go

@@ -202,7 +202,10 @@ func Main(c *config.C, configTest bool, buildVersion string, logger *logrus.Logg
 	hostMap := NewHostMap(l, "main", tunCidr, preferredRanges)
 	hostMap.metricsEnabled = c.GetBool("stats.message_metrics", false)
 
-	l.WithField("network", hostMap.vpnCIDR).WithField("preferredRanges", hostMap.preferredRanges).Info("Main HostMap created")
+	l.
+		WithField("network", hostMap.vpnCIDR.String()).
+		WithField("preferredRanges", hostMap.preferredRanges).
+		Info("Main HostMap created")
 
 	/*
 		config.SetDefault("promoter.interval", 10)

outside.go

@@ -84,7 +84,7 @@ func (f *Interface) readOutsidePackets(addr *udp.Addr, via interface{}, out []by
 			signedPayload = signedPayload[header.Len:]
 			// Pull the Roaming parts up here, and return in all call paths.
 			f.handleHostRoaming(hostinfo, addr)
-			f.connectionManager.In(hostinfo.vpnIp)
+			f.connectionManager.In(hostinfo.localIndexId)
 
 			relay, ok := hostinfo.relayState.QueryRelayForByIdx(h.RemoteIndex)
 			if !ok {
@@ -93,7 +93,7 @@ func (f *Interface) readOutsidePackets(addr *udp.Addr, via interface{}, out []by
 				hostinfo.logger(f.l).WithField("hostinfo", hostinfo.vpnIp).WithField("remoteIndex", h.RemoteIndex).Errorf("HostInfo missing remote index")
 				// Delete my local index from the hostmap
 				f.hostMap.DeleteRelayIdx(h.RemoteIndex)
-				// When the peer doesn't recieve any return traffic, its connection_manager will eventually clean up
+				// When the peer doesn't receive any return traffic, its connection_manager will eventually clean up
 				// the broken relay when it cleans up the associated HostInfo object.
 				return
 			}
@@ -237,17 +237,19 @@ func (f *Interface) readOutsidePackets(addr *udp.Addr, via interface{}, out []by
 
 	f.handleHostRoaming(hostinfo, addr)
 
-	f.connectionManager.In(hostinfo.vpnIp)
+	f.connectionManager.In(hostinfo.localIndexId)
 }
 
 // closeTunnel closes a tunnel locally, it does not send a closeTunnel packet to the remote
 func (f *Interface) closeTunnel(hostInfo *HostInfo) {
 	//TODO: this would be better as a single function in ConnectionManager that handled locks appropriately
-	f.connectionManager.ClearIP(hostInfo.vpnIp)
-	f.connectionManager.ClearPendingDeletion(hostInfo.vpnIp)
-	f.lightHouse.DeleteVpnIp(hostInfo.vpnIp)
-
-	f.hostMap.DeleteHostInfo(hostInfo)
+	f.connectionManager.ClearLocalIndex(hostInfo.localIndexId)
+	f.connectionManager.ClearPendingDeletion(hostInfo.localIndexId)
+	final := f.hostMap.DeleteHostInfo(hostInfo)
+	if final {
+		// We no longer have any tunnels with this vpn ip, clear learned lighthouse state to lower memory usage
+		f.lightHouse.DeleteVpnIp(hostInfo.vpnIp)
+	}
 }
 
 // sendCloseTunnel is a helper function to send a proper close tunnel packet to a remote
@@ -418,7 +420,7 @@ func (f *Interface) decryptToTun(hostinfo *HostInfo, messageCounter uint64, out
 		return
 	}
 
-	f.connectionManager.In(hostinfo.vpnIp)
+	f.connectionManager.In(hostinfo.localIndexId)
 	_, err = f.readers[q].Write(out)
 	if err != nil {
 		f.l.WithError(err).Error("Failed to write to tun")

overlay/tun_android.go

@@ -28,11 +28,13 @@ func newTunFromFd(l *logrus.Logger, deviceFd int, cidr *net.IPNet, _ int, routes
 		return nil, err
 	}
 
+	// XXX Android returns an fd in non-blocking mode which is necessary for shutdown to work properly.
+	// Be sure not to call file.Fd() as it will set the fd to blocking mode.
 	file := os.NewFile(uintptr(deviceFd), "/dev/net/tun")
 
 	return &tun{
 		ReadWriteCloser: file,
-		fd:              int(file.Fd()),
+		fd:              deviceFd,
 		cidr:            cidr,
 		l:               l,
 		routeTree:       routeTree,

overlay/tun_tester.go

@@ -51,7 +51,7 @@ func newTunFromFd(_ *logrus.Logger, _ int, _ *net.IPNet, _ int, _ []Route, _ int
 // packets should exit the udp side, capture them with udpConn.Get
 func (t *TestTun) Send(packet []byte) {
 	if t.l.Level >= logrus.InfoLevel {
-		t.l.WithField("dataLen", len(packet)).Info("Tun receiving injected packet")
+		t.l.WithField("dataLen", len(packet)).Debug("Tun receiving injected packet")
 	}
 	t.rxPackets <- packet
 }

punchy.go

@@ -9,10 +9,10 @@ import (
 )
 
 type Punchy struct {
-	atomicPunch   int32
-	atomicRespond int32
-	atomicDelay   time.Duration
-	l             *logrus.Logger
+	punch   atomic.Bool
+	respond atomic.Bool
+	delay   atomic.Int64
+	l       *logrus.Logger
 }
 
 func NewPunchyFromConfig(l *logrus.Logger, c *config.C) *Punchy {
@@ -36,12 +36,7 @@ func (p *Punchy) reload(c *config.C, initial bool) {
 			yes = c.GetBool("punchy", false)
 		}
 
-		if yes {
-			atomic.StoreInt32(&p.atomicPunch, 1)
-		} else {
-			atomic.StoreInt32(&p.atomicPunch, 0)
-		}
-
+		p.punch.Store(yes)
 	} else if c.HasChanged("punchy.punch") || c.HasChanged("punchy") {
 		//TODO: it should be relatively easy to support this, just need to be able to cancel the goroutine and boot it up from here
 		p.l.Warn("Changing punchy.punch with reload is not supported, ignoring.")
@@ -56,11 +51,7 @@ func (p *Punchy) reload(c *config.C, initial bool) {
 			yes = c.GetBool("punch_back", false)
 		}
 
-		if yes {
-			atomic.StoreInt32(&p.atomicRespond, 1)
-		} else {
-			atomic.StoreInt32(&p.atomicRespond, 0)
-		}
+		p.respond.Store(yes)
 
 		if !initial {
 			p.l.Infof("punchy.respond changed to %v", p.GetRespond())
@@ -69,7 +60,7 @@ func (p *Punchy) reload(c *config.C, initial bool) {
 
 	//NOTE: this will not apply to any in progress operations, only the next one
 	if initial || c.HasChanged("punchy.delay") {
-		atomic.StoreInt64((*int64)(&p.atomicDelay), (int64)(c.GetDuration("punchy.delay", time.Second)))
+		p.delay.Store((int64)(c.GetDuration("punchy.delay", time.Second)))
 		if !initial {
 			p.l.Infof("punchy.delay changed to %s", p.GetDelay())
 		}
@@ -77,13 +68,13 @@ func (p *Punchy) reload(c *config.C, initial bool) {
 }
 
 func (p *Punchy) GetPunch() bool {
-	return atomic.LoadInt32(&p.atomicPunch) == 1
+	return p.punch.Load()
 }
 
 func (p *Punchy) GetRespond() bool {
-	return atomic.LoadInt32(&p.atomicRespond) == 1
+	return p.respond.Load()
 }
 
 func (p *Punchy) GetDelay() time.Duration {
-	return (time.Duration)(atomic.LoadInt64((*int64)(&p.atomicDelay)))
+	return (time.Duration)(p.delay.Load())
 }

relay_manager.go

@@ -13,9 +13,9 @@ import (
 )
 
 type relayManager struct {
-	l             *logrus.Logger
-	hostmap       *HostMap
-	atomicAmRelay int32
+	l       *logrus.Logger
+	hostmap *HostMap
+	amRelay atomic.Bool
 }
 
 func NewRelayManager(ctx context.Context, l *logrus.Logger, hostmap *HostMap, c *config.C) *relayManager {
@@ -41,18 +41,11 @@ func (rm *relayManager) reload(c *config.C, initial bool) error {
 }
 
 func (rm *relayManager) GetAmRelay() bool {
-	return atomic.LoadInt32(&rm.atomicAmRelay) == 1
+	return rm.amRelay.Load()
 }
 
 func (rm *relayManager) setAmRelay(v bool) {
-	var val int32
-	switch v {
-	case true:
-		val = 1
-	case false:
-		val = 0
-	}
-	atomic.StoreInt32(&rm.atomicAmRelay, val)
+	rm.amRelay.Store(v)
 }
 
 // AddRelay finds an available relay index on the hostmap, and associates the relay info with it.
@@ -68,6 +61,11 @@ func AddRelay(l *logrus.Logger, relayHostInfo *HostInfo, hm *HostMap, vpnIp iput
 
 		_, inRelays := hm.Relays[index]
 		if !inRelays {
+			// Avoid standing up a relay that can't be used since only the primary hostinfo
+			// will be pointed to by the relay logic
+			//TODO: if there was an existing primary and it had relay state, should we merge?
+			hm.unlockedMakePrimary(relayHostInfo)
+
 			hm.Relays[index] = relayHostInfo
 			newRelay := Relay{
 				Type:       relayType,

remote_list.go

@@ -130,7 +130,7 @@ func (r *RemoteList) CopyAddrs(preferredRanges []*net.IPNet) []*udp.Addr {
 // LearnRemote locks and sets the learned slot for the owner vpn ip to the provided addr
 // Currently this is only needed when HostInfo.SetRemote is called as that should cover both handshaking and roaming.
 // It will mark the deduplicated address list as dirty, so do not call it unless new information is available
-//TODO: this needs to support the allow list list
+// TODO: this needs to support the allow list list
 func (r *RemoteList) LearnRemote(ownerVpnIp iputil.VpnIp, addr *udp.Addr) {
 	r.Lock()
 	defer r.Unlock()

ssh.go

@@ -22,8 +22,9 @@ import (
 )
 
 type sshListHostMapFlags struct {
-	Json   bool
-	Pretty bool
+	Json    bool
+	Pretty  bool
+	ByIndex bool
 }
 
 type sshPrintCertFlags struct {
@@ -174,6 +175,7 @@ func attachCommands(l *logrus.Logger, c *config.C, ssh *sshd.SSHServer, hostMap
 			s := sshListHostMapFlags{}
 			fl.BoolVar(&s.Json, "json", false, "outputs as json with more information")
 			fl.BoolVar(&s.Pretty, "pretty", false, "pretty prints json, assumes -json")
+			fl.BoolVar(&s.ByIndex, "by-index", false, "gets all hosts in the hostmap from the index table")
 			return fl, &s
 		},
 		Callback: func(fs interface{}, a []string, w sshd.StringWriter) error {
@@ -189,6 +191,7 @@ func attachCommands(l *logrus.Logger, c *config.C, ssh *sshd.SSHServer, hostMap
 			s := sshListHostMapFlags{}
 			fl.BoolVar(&s.Json, "json", false, "outputs as json with more information")
 			fl.BoolVar(&s.Pretty, "pretty", false, "pretty prints json, assumes -json")
+			fl.BoolVar(&s.ByIndex, "by-index", false, "gets all hosts in the hostmap from the index table")
 			return fl, &s
 		},
 		Callback: func(fs interface{}, a []string, w sshd.StringWriter) error {
@@ -368,7 +371,13 @@ func sshListHostMap(hostMap *HostMap, a interface{}, w sshd.StringWriter) error
 		return nil
 	}
 
-	hm := listHostMap(hostMap)
+	var hm []ControlHostInfo
+	if fs.ByIndex {
+		hm = listHostMapIndexes(hostMap)
+	} else {
+		hm = listHostMapHosts(hostMap)
+	}
+
 	sort.Slice(hm, func(i, j int) bool {
 		return bytes.Compare(hm[i].VpnIp, hm[j].VpnIp) < 0
 	})
@@ -805,7 +814,7 @@ func sshPrintRelays(ifce *Interface, fs interface{}, a []string, w sshd.StringWr
 				case TerminalType:
 					t = "terminal"
 				default:
-					t = "unkown"
+					t = "unknown"
 				}
 
 				s := ""

sshd/command.go

@@ -40,8 +40,13 @@ func execCommand(c *Command, args []string, w StringWriter) error {
 	if c.Flags != nil {
 		fl, fs = c.Flags()
 		if fl != nil {
-			//TODO: handle the error
-			fl.Parse(args)
+			// SetOutput() here in case fl.Parse dumps usage.
+			fl.SetOutput(w.GetWriter())
+			err := fl.Parse(args)
+			if err != nil {
+				// fl.Parse has dumped error information to the user via the w writer.
+				return err
+			}
 			args = fl.Args()
 		}
 	}

stats.go

@@ -18,7 +18,7 @@ import (
 	"github.com/slackhq/nebula/config"
 )
 
-// startStats initializes stats from config. On success, if any futher work
+// startStats initializes stats from config. On success, if any further work
 // is needed to serve stats, it returns a func to handle that work. If no
 // work is needed, it'll return nil. On failure, it returns nil, error.
 func startStats(l *logrus.Logger, c *config.C, buildVersion string, configTest bool) (func(), error) {

timeout.go

@@ -1,17 +1,14 @@
 package nebula
 
 import (
+	"sync"
 	"time"
-
-	"github.com/slackhq/nebula/firewall"
 )
 
 // How many timer objects should be cached
 const timerCacheMax = 50000
 
-var emptyFWPacket = firewall.Packet{}
-
-type TimerWheel struct {
+type TimerWheel[T any] struct {
 	// Current tick
 	current int
 
@@ -26,60 +23,73 @@ type TimerWheel struct {
 	wheelDuration time.Duration
 
 	// The actual wheel which is just a set of singly linked lists, head/tail pointers
-	wheel []*TimeoutList
+	wheel []*TimeoutList[T]
 
 	// Singly linked list of items that have timed out of the wheel
-	expired *TimeoutList
+	expired *TimeoutList[T]
 
 	// Item cache to avoid garbage collect
-	itemCache   *TimeoutItem
+	itemCache   *TimeoutItem[T]
 	itemsCached int
 }
 
-// Represents a tick in the wheel
-type TimeoutList struct {
-	Head *TimeoutItem
-	Tail *TimeoutItem
+type LockingTimerWheel[T any] struct {
+	m sync.Mutex
+	t *TimerWheel[T]
 }
 
-// Represents an item within a tick
-type TimeoutItem struct {
-	Packet firewall.Packet
-	Next   *TimeoutItem
+// TimeoutList Represents a tick in the wheel
+type TimeoutList[T any] struct {
+	Head *TimeoutItem[T]
+	Tail *TimeoutItem[T]
 }
 
-// Builds a timer wheel and identifies the tick duration and wheel duration from the provided values
+// TimeoutItem Represents an item within a tick
+type TimeoutItem[T any] struct {
+	Item T
+	Next *TimeoutItem[T]
+}
+
+// NewTimerWheel Builds a timer wheel and identifies the tick duration and wheel duration from the provided values
 // Purge must be called once per entry to actually remove anything
-func NewTimerWheel(min, max time.Duration) *TimerWheel {
+// The TimerWheel does not handle concurrency on its own.
+// Locks around access to it must be used if multiple routines are manipulating it.
+func NewTimerWheel[T any](min, max time.Duration) *TimerWheel[T] {
 	//TODO provide an error
 	//if min >= max {
 	//	return nil
 	//}
 
-	// Round down and add 1 so we can have the smallest # of ticks in the wheel and still account for a full
-	// max duration
-	wLen := int((max / min) + 1)
+	// Round down and add 2 so we can have the smallest # of ticks in the wheel and still account for a full
+	// max duration, even if our current tick is at the maximum position and the next item to be added is at maximum
+	// timeout
+	wLen := int((max / min) + 2)
 
-	tw := TimerWheel{
+	tw := TimerWheel[T]{
 		wheelLen:      wLen,
-		wheel:         make([]*TimeoutList, wLen),
+		wheel:         make([]*TimeoutList[T], wLen),
 		tickDuration:  min,
 		wheelDuration: max,
-		expired:       &TimeoutList{},
+		expired:       &TimeoutList[T]{},
 	}
 
 	for i := range tw.wheel {
-		tw.wheel[i] = &TimeoutList{}
+		tw.wheel[i] = &TimeoutList[T]{}
 	}
 
 	return &tw
 }
 
-// Add will add a firewall.Packet to the wheel in it's proper timeout
-func (tw *TimerWheel) Add(v firewall.Packet, timeout time.Duration) *TimeoutItem {
-	// Check and see if we should progress the tick
-	tw.advance(time.Now())
+// NewLockingTimerWheel is version of TimerWheel that is safe for concurrent use with a small performance penalty
+func NewLockingTimerWheel[T any](min, max time.Duration) *LockingTimerWheel[T] {
+	return &LockingTimerWheel[T]{
+		t: NewTimerWheel[T](min, max),
+	}
+}
 
+// Add will add an item to the wheel in its proper timeout.
+// Caller should Advance the wheel prior to ensure the proper slot is used.
+func (tw *TimerWheel[T]) Add(v T, timeout time.Duration) *TimeoutItem[T] {
 	i := tw.findWheel(timeout)
 
 	// Try to fetch off the cache
@@ -89,11 +99,11 @@ func (tw *TimerWheel) Add(v firewall.Packet, timeout time.Duration) *TimeoutItem
 		tw.itemsCached--
 		ti.Next = nil
 	} else {
-		ti = &TimeoutItem{}
+		ti = &TimeoutItem[T]{}
 	}
 
 	// Relink and return
-	ti.Packet = v
+	ti.Item = v
 	if tw.wheel[i].Tail == nil {
 		tw.wheel[i].Head = ti
 		tw.wheel[i].Tail = ti
@@ -105,9 +115,12 @@ func (tw *TimerWheel) Add(v firewall.Packet, timeout time.Duration) *TimeoutItem
 	return ti
 }
 
-func (tw *TimerWheel) Purge() (firewall.Packet, bool) {
+// Purge removes and returns the first available expired item from the wheel and the 2nd argument is true.
+// If no item is available then an empty T is returned and the 2nd argument is false.
+func (tw *TimerWheel[T]) Purge() (T, bool) {
 	if tw.expired.Head == nil {
-		return emptyFWPacket, false
+		var na T
+		return na, false
 	}
 
 	ti := tw.expired.Head
@@ -127,11 +140,11 @@ func (tw *TimerWheel) Purge() (firewall.Packet, bool) {
 		tw.itemsCached++
 	}
 
-	return ti.Packet, true
+	return ti.Item, true
 }
 
-// advance will move the wheel forward by proper number of ticks. The caller _should_ lock the wheel before calling this
-func (tw *TimerWheel) findWheel(timeout time.Duration) (i int) {
+// findWheel find the next position in the wheel for the provided timeout given the current tick
+func (tw *TimerWheel[T]) findWheel(timeout time.Duration) (i int) {
 	if timeout < tw.tickDuration {
 		// Can't track anything below the set resolution
 		timeout = tw.tickDuration
@@ -153,8 +166,9 @@ func (tw *TimerWheel) findWheel(timeout time.Duration) (i int) {
 	return tick
 }
 
-// advance will lock and move the wheel forward by proper number of ticks.
-func (tw *TimerWheel) advance(now time.Time) {
+// Advance will move the wheel forward by the appropriate number of ticks for the provided time and all items
+// passed over will be moved to the expired list. Calling Purge is necessary to remove them entirely.
+func (tw *TimerWheel[T]) Advance(now time.Time) {
 	if tw.lastTick == nil {
 		tw.lastTick = &now
 	}
@@ -191,3 +205,21 @@ func (tw *TimerWheel) advance(now time.Time) {
 	newTick := tw.lastTick.Add(tw.tickDuration * time.Duration(adv))
 	tw.lastTick = &newTick
 }
+
+func (lw *LockingTimerWheel[T]) Add(v T, timeout time.Duration) *TimeoutItem[T] {
+	lw.m.Lock()
+	defer lw.m.Unlock()
+	return lw.t.Add(v, timeout)
+}
+
+func (lw *LockingTimerWheel[T]) Purge() (T, bool) {
+	lw.m.Lock()
+	defer lw.m.Unlock()
+	return lw.t.Purge()
+}
+
+func (lw *LockingTimerWheel[T]) Advance(now time.Time) {
+	lw.m.Lock()
+	defer lw.m.Unlock()
+	lw.t.Advance(now)
+}

timeout_system.go

@@ -1,198 +0,0 @@
-package nebula
-
-import (
-	"sync"
-	"time"
-
-	"github.com/slackhq/nebula/iputil"
-)
-
-// How many timer objects should be cached
-const systemTimerCacheMax = 50000
-
-type SystemTimerWheel struct {
-	// Current tick
-	current int
-
-	// Cheat on finding the length of the wheel
-	wheelLen int
-
-	// Last time we ticked, since we are lazy ticking
-	lastTick *time.Time
-
-	// Durations of a tick and the entire wheel
-	tickDuration  time.Duration
-	wheelDuration time.Duration
-
-	// The actual wheel which is just a set of singly linked lists, head/tail pointers
-	wheel []*SystemTimeoutList
-
-	// Singly linked list of items that have timed out of the wheel
-	expired *SystemTimeoutList
-
-	// Item cache to avoid garbage collect
-	itemCache   *SystemTimeoutItem
-	itemsCached int
-
-	lock sync.Mutex
-}
-
-// Represents a tick in the wheel
-type SystemTimeoutList struct {
-	Head *SystemTimeoutItem
-	Tail *SystemTimeoutItem
-}
-
-// Represents an item within a tick
-type SystemTimeoutItem struct {
-	Item iputil.VpnIp
-	Next *SystemTimeoutItem
-}
-
-// Builds a timer wheel and identifies the tick duration and wheel duration from the provided values
-// Purge must be called once per entry to actually remove anything
-func NewSystemTimerWheel(min, max time.Duration) *SystemTimerWheel {
-	//TODO provide an error
-	//if min >= max {
-	//	return nil
-	//}
-
-	// Round down and add 1 so we can have the smallest # of ticks in the wheel and still account for a full
-	// max duration
-	wLen := int((max / min) + 1)
-
-	tw := SystemTimerWheel{
-		wheelLen:      wLen,
-		wheel:         make([]*SystemTimeoutList, wLen),
-		tickDuration:  min,
-		wheelDuration: max,
-		expired:       &SystemTimeoutList{},
-	}
-
-	for i := range tw.wheel {
-		tw.wheel[i] = &SystemTimeoutList{}
-	}
-
-	return &tw
-}
-
-func (tw *SystemTimerWheel) Add(v iputil.VpnIp, timeout time.Duration) *SystemTimeoutItem {
-	tw.lock.Lock()
-	defer tw.lock.Unlock()
-
-	// Check and see if we should progress the tick
-	//tw.advance(time.Now())
-
-	i := tw.findWheel(timeout)
-
-	// Try to fetch off the cache
-	ti := tw.itemCache
-	if ti != nil {
-		tw.itemCache = ti.Next
-		ti.Next = nil
-		tw.itemsCached--
-	} else {
-		ti = &SystemTimeoutItem{}
-	}
-
-	// Relink and return
-	ti.Item = v
-	ti.Next = tw.wheel[i].Head
-	tw.wheel[i].Head = ti
-
-	if tw.wheel[i].Tail == nil {
-		tw.wheel[i].Tail = ti
-	}
-
-	return ti
-}
-
-func (tw *SystemTimerWheel) Purge() interface{} {
-	tw.lock.Lock()
-	defer tw.lock.Unlock()
-
-	if tw.expired.Head == nil {
-		return nil
-	}
-
-	ti := tw.expired.Head
-	tw.expired.Head = ti.Next
-
-	if tw.expired.Head == nil {
-		tw.expired.Tail = nil
-	}
-
-	p := ti.Item
-
-	// Clear out the items references
-	ti.Item = 0
-	ti.Next = nil
-
-	// Maybe cache it for later
-	if tw.itemsCached < systemTimerCacheMax {
-		ti.Next = tw.itemCache
-		tw.itemCache = ti
-		tw.itemsCached++
-	}
-
-	return p
-}
-
-func (tw *SystemTimerWheel) findWheel(timeout time.Duration) (i int) {
-	if timeout < tw.tickDuration {
-		// Can't track anything below the set resolution
-		timeout = tw.tickDuration
-	} else if timeout > tw.wheelDuration {
-		// We aren't handling timeouts greater than the wheels duration
-		timeout = tw.wheelDuration
-	}
-
-	// Find the next highest, rounding up
-	tick := int(((timeout - 1) / tw.tickDuration) + 1)
-
-	// Add another tick since the current tick may almost be over then map it to the wheel from our
-	// current position
-	tick += tw.current + 1
-	if tick >= tw.wheelLen {
-		tick -= tw.wheelLen
-	}
-
-	return tick
-}
-
-func (tw *SystemTimerWheel) advance(now time.Time) {
-	tw.lock.Lock()
-	defer tw.lock.Unlock()
-
-	if tw.lastTick == nil {
-		tw.lastTick = &now
-	}
-
-	// We want to round down
-	ticks := int(now.Sub(*tw.lastTick) / tw.tickDuration)
-	//l.Infoln("Ticks: ", ticks)
-	for i := 0; i < ticks; i++ {
-		tw.current++
-		//l.Infoln("Tick: ", tw.current)
-		if tw.current >= tw.wheelLen {
-			tw.current = 0
-		}
-
-		// We need to append the expired items as to not starve evicting the oldest ones
-		if tw.expired.Tail == nil {
-			tw.expired.Head = tw.wheel[tw.current].Head
-			tw.expired.Tail = tw.wheel[tw.current].Tail
-		} else {
-			tw.expired.Tail.Next = tw.wheel[tw.current].Head
-			if tw.wheel[tw.current].Tail != nil {
-				tw.expired.Tail = tw.wheel[tw.current].Tail
-			}
-		}
-
-		//l.Infoln("Head: ", tw.expired.Head, "Tail: ", tw.expired.Tail)
-		tw.wheel[tw.current].Head = nil
-		tw.wheel[tw.current].Tail = nil
-
-		tw.lastTick = &now
-	}
-}

timeout_system_test.go

@@ -1,135 +0,0 @@
-package nebula
-
-import (
-	"net"
-	"testing"
-	"time"
-
-	"github.com/slackhq/nebula/iputil"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestNewSystemTimerWheel(t *testing.T) {
-	// Make sure we get an object we expect
-	tw := NewSystemTimerWheel(time.Second, time.Second*10)
-	assert.Equal(t, 11, tw.wheelLen)
-	assert.Equal(t, 0, tw.current)
-	assert.Nil(t, tw.lastTick)
-	assert.Equal(t, time.Second*1, tw.tickDuration)
-	assert.Equal(t, time.Second*10, tw.wheelDuration)
-	assert.Len(t, tw.wheel, 11)
-
-	// Assert the math is correct
-	tw = NewSystemTimerWheel(time.Second*3, time.Second*10)
-	assert.Equal(t, 4, tw.wheelLen)
-
-	tw = NewSystemTimerWheel(time.Second*120, time.Minute*10)
-	assert.Equal(t, 6, tw.wheelLen)
-}
-
-func TestSystemTimerWheel_findWheel(t *testing.T) {
-	tw := NewSystemTimerWheel(time.Second, time.Second*10)
-	assert.Len(t, tw.wheel, 11)
-
-	// Current + tick + 1 since we don't know how far into current we are
-	assert.Equal(t, 2, tw.findWheel(time.Second*1))
-
-	// Scale up to min duration
-	assert.Equal(t, 2, tw.findWheel(time.Millisecond*1))
-
-	// Make sure we hit that last index
-	assert.Equal(t, 0, tw.findWheel(time.Second*10))
-
-	// Scale down to max duration
-	assert.Equal(t, 0, tw.findWheel(time.Second*11))
-
-	tw.current = 1
-	// Make sure we account for the current position properly
-	assert.Equal(t, 3, tw.findWheel(time.Second*1))
-	assert.Equal(t, 1, tw.findWheel(time.Second*10))
-}
-
-func TestSystemTimerWheel_Add(t *testing.T) {
-	tw := NewSystemTimerWheel(time.Second, time.Second*10)
-
-	fp1 := iputil.Ip2VpnIp(net.ParseIP("1.2.3.4"))
-	tw.Add(fp1, time.Second*1)
-
-	// Make sure we set head and tail properly
-	assert.NotNil(t, tw.wheel[2])
-	assert.Equal(t, fp1, tw.wheel[2].Head.Item)
-	assert.Nil(t, tw.wheel[2].Head.Next)
-	assert.Equal(t, fp1, tw.wheel[2].Tail.Item)
-	assert.Nil(t, tw.wheel[2].Tail.Next)
-
-	// Make sure we only modify head
-	fp2 := iputil.Ip2VpnIp(net.ParseIP("1.2.3.4"))
-	tw.Add(fp2, time.Second*1)
-	assert.Equal(t, fp2, tw.wheel[2].Head.Item)
-	assert.Equal(t, fp1, tw.wheel[2].Head.Next.Item)
-	assert.Equal(t, fp1, tw.wheel[2].Tail.Item)
-	assert.Nil(t, tw.wheel[2].Tail.Next)
-
-	// Make sure we use free'd items first
-	tw.itemCache = &SystemTimeoutItem{}
-	tw.itemsCached = 1
-	tw.Add(fp2, time.Second*1)
-	assert.Nil(t, tw.itemCache)
-	assert.Equal(t, 0, tw.itemsCached)
-}
-
-func TestSystemTimerWheel_Purge(t *testing.T) {
-	// First advance should set the lastTick and do nothing else
-	tw := NewSystemTimerWheel(time.Second, time.Second*10)
-	assert.Nil(t, tw.lastTick)
-	tw.advance(time.Now())
-	assert.NotNil(t, tw.lastTick)
-	assert.Equal(t, 0, tw.current)
-
-	fps := []iputil.VpnIp{9, 10, 11, 12}
-
-	//fp1 := ip2int(net.ParseIP("1.2.3.4"))
-
-	tw.Add(fps[0], time.Second*1)
-	tw.Add(fps[1], time.Second*1)
-	tw.Add(fps[2], time.Second*2)
-	tw.Add(fps[3], time.Second*2)
-
-	ta := time.Now().Add(time.Second * 3)
-	lastTick := *tw.lastTick
-	tw.advance(ta)
-	assert.Equal(t, 3, tw.current)
-	assert.True(t, tw.lastTick.After(lastTick))
-
-	// Make sure we get all 4 packets back
-	for i := 0; i < 4; i++ {
-		assert.Contains(t, fps, tw.Purge())
-	}
-
-	// Make sure there aren't any leftover
-	assert.Nil(t, tw.Purge())
-	assert.Nil(t, tw.expired.Head)
-	assert.Nil(t, tw.expired.Tail)
-
-	// Make sure we cached the free'd items
-	assert.Equal(t, 4, tw.itemsCached)
-	ci := tw.itemCache
-	for i := 0; i < 4; i++ {
-		assert.NotNil(t, ci)
-		ci = ci.Next
-	}
-	assert.Nil(t, ci)
-
-	// Lets make sure we roll over properly
-	ta = ta.Add(time.Second * 5)
-	tw.advance(ta)
-	assert.Equal(t, 8, tw.current)
-
-	ta = ta.Add(time.Second * 2)
-	tw.advance(ta)
-	assert.Equal(t, 10, tw.current)
-
-	ta = ta.Add(time.Second * 1)
-	tw.advance(ta)
-	assert.Equal(t, 0, tw.current)
-}

timeout_test.go

@@ -10,25 +10,37 @@ import (
 
 func TestNewTimerWheel(t *testing.T) {
 	// Make sure we get an object we expect
-	tw := NewTimerWheel(time.Second, time.Second*10)
-	assert.Equal(t, 11, tw.wheelLen)
+	tw := NewTimerWheel[firewall.Packet](time.Second, time.Second*10)
+	assert.Equal(t, 12, tw.wheelLen)
 	assert.Equal(t, 0, tw.current)
 	assert.Nil(t, tw.lastTick)
 	assert.Equal(t, time.Second*1, tw.tickDuration)
 	assert.Equal(t, time.Second*10, tw.wheelDuration)
-	assert.Len(t, tw.wheel, 11)
+	assert.Len(t, tw.wheel, 12)
 
 	// Assert the math is correct
-	tw = NewTimerWheel(time.Second*3, time.Second*10)
-	assert.Equal(t, 4, tw.wheelLen)
+	tw = NewTimerWheel[firewall.Packet](time.Second*3, time.Second*10)
+	assert.Equal(t, 5, tw.wheelLen)
+
+	tw = NewTimerWheel[firewall.Packet](time.Second*120, time.Minute*10)
+	assert.Equal(t, 7, tw.wheelLen)
+
+	// Test empty purge of non nil items
+	i, ok := tw.Purge()
+	assert.Equal(t, firewall.Packet{}, i)
+	assert.False(t, ok)
+
+	// Test empty purges of nil items
+	tw2 := NewTimerWheel[*int](time.Second, time.Second*10)
+	i2, ok := tw2.Purge()
+	assert.Nil(t, i2)
+	assert.False(t, ok)
 
-	tw = NewTimerWheel(time.Second*120, time.Minute*10)
-	assert.Equal(t, 6, tw.wheelLen)
 }
 
 func TestTimerWheel_findWheel(t *testing.T) {
-	tw := NewTimerWheel(time.Second, time.Second*10)
-	assert.Len(t, tw.wheel, 11)
+	tw := NewTimerWheel[firewall.Packet](time.Second, time.Second*10)
+	assert.Len(t, tw.wheel, 12)
 
 	// Current + tick + 1 since we don't know how far into current we are
 	assert.Equal(t, 2, tw.findWheel(time.Second*1))
@@ -37,51 +49,68 @@ func TestTimerWheel_findWheel(t *testing.T) {
 	assert.Equal(t, 2, tw.findWheel(time.Millisecond*1))
 
 	// Make sure we hit that last index
-	assert.Equal(t, 0, tw.findWheel(time.Second*10))
+	assert.Equal(t, 11, tw.findWheel(time.Second*10))
 
 	// Scale down to max duration
-	assert.Equal(t, 0, tw.findWheel(time.Second*11))
+	assert.Equal(t, 11, tw.findWheel(time.Second*11))
 
 	tw.current = 1
 	// Make sure we account for the current position properly
 	assert.Equal(t, 3, tw.findWheel(time.Second*1))
-	assert.Equal(t, 1, tw.findWheel(time.Second*10))
+	assert.Equal(t, 0, tw.findWheel(time.Second*10))
 }
 
 func TestTimerWheel_Add(t *testing.T) {
-	tw := NewTimerWheel(time.Second, time.Second*10)
+	tw := NewTimerWheel[firewall.Packet](time.Second, time.Second*10)
 
 	fp1 := firewall.Packet{}
 	tw.Add(fp1, time.Second*1)
 
 	// Make sure we set head and tail properly
 	assert.NotNil(t, tw.wheel[2])
-	assert.Equal(t, fp1, tw.wheel[2].Head.Packet)
+	assert.Equal(t, fp1, tw.wheel[2].Head.Item)
 	assert.Nil(t, tw.wheel[2].Head.Next)
-	assert.Equal(t, fp1, tw.wheel[2].Tail.Packet)
+	assert.Equal(t, fp1, tw.wheel[2].Tail.Item)
 	assert.Nil(t, tw.wheel[2].Tail.Next)
 
 	// Make sure we only modify head
 	fp2 := firewall.Packet{}
 	tw.Add(fp2, time.Second*1)
-	assert.Equal(t, fp2, tw.wheel[2].Head.Packet)
-	assert.Equal(t, fp1, tw.wheel[2].Head.Next.Packet)
-	assert.Equal(t, fp1, tw.wheel[2].Tail.Packet)
+	assert.Equal(t, fp2, tw.wheel[2].Head.Item)
+	assert.Equal(t, fp1, tw.wheel[2].Head.Next.Item)
+	assert.Equal(t, fp1, tw.wheel[2].Tail.Item)
 	assert.Nil(t, tw.wheel[2].Tail.Next)
 
 	// Make sure we use free'd items first
-	tw.itemCache = &TimeoutItem{}
+	tw.itemCache = &TimeoutItem[firewall.Packet]{}
 	tw.itemsCached = 1
 	tw.Add(fp2, time.Second*1)
 	assert.Nil(t, tw.itemCache)
 	assert.Equal(t, 0, tw.itemsCached)
+
+	// Ensure that all configurations of a wheel does not result in calculating an overflow of the wheel
+	for min := time.Duration(1); min < 100; min++ {
+		for max := min; max < 100; max++ {
+			tw = NewTimerWheel[firewall.Packet](min, max)
+
+			for current := 0; current < tw.wheelLen; current++ {
+				tw.current = current
+				for timeout := time.Duration(0); timeout <= tw.wheelDuration; timeout++ {
+					tick := tw.findWheel(timeout)
+					if tick >= tw.wheelLen {
+						t.Errorf("Min: %v; Max: %v; Wheel len: %v; Current Tick: %v; Insert timeout: %v; Calc tick: %v", min, max, tw.wheelLen, current, timeout, tick)
+					}
+				}
+			}
+		}
+	}
 }
 
 func TestTimerWheel_Purge(t *testing.T) {
 	// First advance should set the lastTick and do nothing else
-	tw := NewTimerWheel(time.Second, time.Second*10)
+	tw := NewTimerWheel[firewall.Packet](time.Second, time.Second*10)
 	assert.Nil(t, tw.lastTick)
-	tw.advance(time.Now())
+	tw.Advance(time.Now())
 	assert.NotNil(t, tw.lastTick)
 	assert.Equal(t, 0, tw.current)
 
@@ -99,7 +128,7 @@ func TestTimerWheel_Purge(t *testing.T) {
 
 	ta := time.Now().Add(time.Second * 3)
 	lastTick := *tw.lastTick
-	tw.advance(ta)
+	tw.Advance(ta)
 	assert.Equal(t, 3, tw.current)
 	assert.True(t, tw.lastTick.After(lastTick))
 
@@ -125,16 +154,20 @@ func TestTimerWheel_Purge(t *testing.T) {
 	}
 	assert.Nil(t, ci)
 
-	// Lets make sure we roll over properly
+	// Let's make sure we roll over properly
 	ta = ta.Add(time.Second * 5)
-	tw.advance(ta)
+	tw.Advance(ta)
 	assert.Equal(t, 8, tw.current)
 
 	ta = ta.Add(time.Second * 2)
-	tw.advance(ta)
+	tw.Advance(ta)
 	assert.Equal(t, 10, tw.current)
 
 	ta = ta.Add(time.Second * 1)
-	tw.advance(ta)
+	tw.Advance(ta)
+	assert.Equal(t, 11, tw.current)
+
+	ta = ta.Add(time.Second * 1)
+	tw.Advance(ta)
 	assert.Equal(t, 0, tw.current)
 }

udp/udp_tester.go

@@ -66,7 +66,7 @@ func (u *Conn) Send(packet *Packet) {
 		u.l.WithField("header", h).
 			WithField("udpAddr", fmt.Sprintf("%v:%v", packet.FromIp, packet.FromPort)).
 			WithField("dataLen", len(packet.Data)).
-			Info("UDP receiving injected packet")
+			Debug("UDP receiving injected packet")
 	}
 	u.RxPackets <- packet
 }

wintun/tun.go

@@ -59,18 +59,14 @@ func procyield(cycles uint32)
 //go:linkname nanotime runtime.nanotime
 func nanotime() int64
 
-//
 // CreateTUN creates a Wintun interface with the given name. Should a Wintun
 // interface with the same name exist, it is reused.
-//
 func CreateTUN(ifname string, mtu int) (Device, error) {
 	return CreateTUNWithRequestedGUID(ifname, WintunStaticRequestedGUID, mtu)
 }
 
-//
 // CreateTUNWithRequestedGUID creates a Wintun interface with the given name and
 // a requested GUID. Should a Wintun interface with the same name exist, it is reused.
-//
 func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID, mtu int) (Device, error) {
 	wt, err := wintun.CreateAdapter(ifname, WintunTunnelType, requestedGUID)
 	if err != nil {