update synctrace

* add netlink options

* force use buffer

* fix namings and add config examples

* fix linter

.github/ISSUE_TEMPLATE/config.yml

@@ -1,13 +1,21 @@
 blank_issues_enabled: true
 contact_links:
+  - name: 💨 Performance Issues
+    url: https://github.com/slackhq/nebula/discussions/new/choose
+    about: 'We ask that you create a discussion instead of an issue for performance-related questions. This allows us to have a more open conversation about the issue and helps us to better understand the problem.'
+
+  - name: 📄 Documentation Issues
+    url: https://github.com/definednet/nebula-docs
+    about: "If you've found an issue with the website documentation, please file it in the nebula-docs repository."
+
+  - name: 📱 Mobile Nebula Issues
+    url: https://github.com/definednet/mobile_nebula
+    about: "If you're using the mobile Nebula app and have found an issue, please file it in the mobile_nebula repository."
+
   - name: 📘 Documentation
     url: https://nebula.defined.net/docs/
-    about: Review documentation.
+    about: 'The documentation is the best place to start if you are new to Nebula.'
 
   - 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!'
+    url: https://join.slack.com/t/nebulaoss/shared_invite/zt-2xqe6e7vn-k_KGi8s13nsr7cvHVvHvuQ
+    about: 'For faster support, join us on Slack for assistance!'

.github/pull_request_template.md

@@ -0,0 +1,11 @@
+<!--
+Thank you for taking the time to submit a pull request!
+
+Please be sure to provide a clear description of what you're trying to achieve with the change.
+
+- If you're submitting a new feature, please explain how to use it and document any new config options in the example config.
+- If you're submitting a bugfix, please link the related issue or describe the circumstances surrounding the issue.
+- If you're changing a default, explain why you believe the new default is appropriate for most users.
+
+P.S. If you're only updating the README or other docs, please file a pull request here instead: https://github.com/DefinedNet/nebula-docs
+-->

Makefile

@@ -61,7 +61,7 @@ ALL = $(ALL_LINUX) \
 	windows-arm64
 
 e2e:
-	$(TEST_ENV) go test -tags=e2e_testing -count=1 $(TEST_FLAGS) ./e2e
+	$(TEST_ENV) go test -tags=synctrace,e2e_testing -count=1 $(TEST_FLAGS) ./e2e
 
 e2ev: TEST_FLAGS += -v
 e2ev: e2e
@@ -215,6 +215,7 @@ ifeq ($(words $(MAKECMDGOALS)),1)
 	@$(MAKE) service ${.DEFAULT_GOAL} --no-print-directory
 endif
 
+bin-docker: BUILD_ARGS = -tags=synctrace
 bin-docker: bin build/linux-amd64/nebula build/linux-amd64/nebula-cert
 
 smoke-docker: bin-docker

README.md

@@ -4,7 +4,7 @@ It lets you seamlessly connect computers anywhere in the world. Nebula is portab
 It can be used to connect a small number of computers, but is also able to connect tens of thousands of computers.
 
 Nebula incorporates a number of existing concepts like encryption, security groups, certificates,
-and tunneling, and each of those individual pieces existed before Nebula in various forms.
+and tunneling.
 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.
 
@@ -28,33 +28,33 @@ Check the [releases](https://github.com/slackhq/nebula/releases/latest) page for
 #### Distribution Packages
 
 - [Arch Linux](https://archlinux.org/packages/extra/x86_64/nebula/)
-    ```
-    $ sudo pacman -S nebula
+    ```sh
+    sudo pacman -S nebula
     ```
 
 - [Fedora Linux](https://src.fedoraproject.org/rpms/nebula)
-    ```
-    $ sudo dnf install nebula
+    ```sh
+    sudo dnf install nebula
     ```
 
 - [Debian Linux](https://packages.debian.org/source/stable/nebula)
-    ```
-    $ sudo apt install nebula
+    ```sh
+    sudo apt install nebula
     ```
 
 - [Alpine Linux](https://pkgs.alpinelinux.org/packages?name=nebula)
-    ```
-    $ sudo apk add nebula
+    ```sh
+    sudo apk add nebula
     ```
 
 - [macOS Homebrew](https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/n/nebula.rb)
-    ```
-    $ brew install nebula
+    ```sh
+    brew install nebula
     ```
 
 - [Docker](https://hub.docker.com/r/nebulaoss/nebula)
-    ```
-    $ docker pull nebulaoss/nebula
+    ```sh
+    docker pull nebulaoss/nebula
     ```
 
 #### Mobile
@@ -64,10 +64,10 @@ Check the [releases](https://github.com/slackhq/nebula/releases/latest) page for
 
 ## Technical Overview
 
-Nebula is a mutually authenticated peer-to-peer software defined network based on the [Noise Protocol Framework](https://noiseprotocol.org/).
+Nebula is a mutually authenticated peer-to-peer software-defined network based on the [Noise Protocol Framework](https://noiseprotocol.org/).
 Nebula uses certificates to assert a node's IP address, name, and membership within user-defined groups.
 Nebula's user-defined groups allow for provider agnostic traffic filtering between nodes.
-Discovery nodes allow individual peers to find each other and optionally use UDP hole punching to establish connections from behind most firewalls or NATs.
+Discovery nodes (aka lighthouses) allow individual peers to find each other and optionally use UDP hole punching to establish connections from behind most firewalls or NATs.
 Users can move data between nodes in any number of cloud service providers, datacenters, and endpoints, without needing to maintain a particular addressing scheme.
 
 Nebula uses Elliptic-curve Diffie-Hellman (`ECDH`) key exchange and `AES-256-GCM` in its default configuration.
@@ -82,28 +82,34 @@ To set up a Nebula network, you'll need:
 
 #### 2. (Optional, but you really should..) At least one discovery node with a routable IP address, which we call a lighthouse.
 
-Nebula lighthouses allow nodes to find each other, anywhere in the world. A lighthouse is the only node in a Nebula network whose IP should not change. Running a lighthouse requires very few compute resources, and you can easily use the least expensive option from a cloud hosting provider. If you're not sure which provider to use, a number of us have used $5/mo [DigitalOcean](https://digitalocean.com) droplets as lighthouses.
-
-  Once you have launched an instance, ensure that Nebula udp traffic (default port udp/4242) can reach it over the internet.
+Nebula lighthouses allow nodes to find each other, anywhere in the world. A lighthouse is the only node in a Nebula network whose IP should not change. Running a lighthouse requires very few compute resources, and you can easily use the least expensive option from a cloud hosting provider. If you're not sure which provider to use, a number of us have used $6/mo [DigitalOcean](https://digitalocean.com) droplets as lighthouses.
 
+Once you have launched an instance, ensure that Nebula udp traffic (default port udp/4242) can reach it over the internet.
 
 #### 3. A Nebula certificate authority, which will be the root of trust for a particular Nebula network.
 
-  ```
-  ./nebula-cert ca -name "Myorganization, Inc"
-  ```
-  This will create files named `ca.key` and `ca.cert` in the current directory. The `ca.key` file is the most sensitive file you'll create, because it is the key used to sign the certificates for individual nebula nodes/hosts. Please store this file somewhere safe, preferably with strong encryption.
+```sh
+./nebula-cert ca -name "Myorganization, Inc"
+```
+
+This will create files named `ca.key` and `ca.cert` in the current directory. The `ca.key` file is the most sensitive file you'll create, because it is the key used to sign the certificates for individual nebula nodes/hosts. Please store this file somewhere safe, preferably with strong encryption.
+
+**Be aware!** By default, certificate authorities have a 1-year lifetime before expiration. See [this guide](https://nebula.defined.net/docs/guides/rotating-certificate-authority/) for details on rotating a CA.
 
 #### 4. Nebula host keys and certificates generated from that certificate authority
+
 This assumes you have four nodes, named lighthouse1, laptop, server1, host3. You can name the nodes any way you'd like, including FQDN. You'll also need to choose IP addresses and the associated subnet. In this example, we are creating a nebula network that will use 192.168.100.x/24 as its network range. This example also demonstrates nebula groups, which can later be used to define traffic rules in a nebula network.
-```
+```sh
 ./nebula-cert sign -name "lighthouse1" -ip "192.168.100.1/24"
 ./nebula-cert sign -name "laptop" -ip "192.168.100.2/24" -groups "laptop,home,ssh"
 ./nebula-cert sign -name "server1" -ip "192.168.100.9/24" -groups "servers"
 ./nebula-cert sign -name "host3" -ip "192.168.100.10/24"
 ```
 
+By default, host certificates will expire 1 second before the CA expires. Use the `-duration` flag to specify a shorter lifetime.
+
 #### 5. Configuration files for each host
+
 Download a copy of the nebula [example configuration](https://github.com/slackhq/nebula/blob/master/examples/config.yml).
 
 * On the lighthouse node, you'll need to ensure `am_lighthouse: true` is set.
@@ -118,10 +124,13 @@ For each host, copy the nebula binary to the host, along with `config.yml` from
 **DO NOT COPY `ca.key` TO INDIVIDUAL NODES.**
 
 #### 7. Run nebula on each host
-```
+
+```sh
 ./nebula -config /path/to/config.yml
 ```
 
+For more detailed instructions, [find the full documentation here](https://nebula.defined.net/docs/).
+
 ## Building Nebula from source
 
 Make sure you have [go](https://go.dev/doc/install) installed and clone this repo. Change to the nebula directory.
@@ -140,8 +149,10 @@ The default curve used for cryptographic handshakes and signatures is Curve25519
 
 In addition, Nebula can be built using the [BoringCrypto GOEXPERIMENT](https://github.com/golang/go/blob/go1.20/src/crypto/internal/boring/README.md) by running either of the following make targets:
 
-    make bin-boringcrypto
-    make release-boringcrypto
+```sh
+make bin-boringcrypto
+make release-boringcrypto
+```
 
 This is not the recommended default deployment, but may be useful based on your compliance requirements.
 
@@ -149,5 +160,3 @@ This is not the recommended default deployment, but may be useful based on your
 
 Nebula was created at Slack Technologies, Inc by Nate Brown and Ryan Huber, with contributions from Oliver Fross, Alan Lam, Wade Simmons, and Lining Wang.
 
-
-

allow_list_test.go

@@ -25,14 +25,14 @@ func TestNewAllowListFromConfig(t *testing.T) {
 	c.Settings["allowlist"] = map[string]any{
 		"192.168.0.0/16": "abc",
 	}
-	_, err = newAllowListFromConfig(c, "allowlist", nil)
+	r, err = newAllowListFromConfig(c, "allowlist", nil)
 	require.EqualError(t, err, "config `allowlist` has invalid value (type string): abc")
 
 	c.Settings["allowlist"] = map[string]any{
 		"192.168.0.0/16": true,
 		"10.0.0.0/8":     false,
 	}
-	_, err = newAllowListFromConfig(c, "allowlist", nil)
+	r, err = newAllowListFromConfig(c, "allowlist", nil)
 	require.EqualError(t, err, "config `allowlist` contains both true and false rules, but no default set for 0.0.0.0/0")
 
 	c.Settings["allowlist"] = map[string]any{
@@ -42,7 +42,7 @@ func TestNewAllowListFromConfig(t *testing.T) {
 		"fd00::/8":       true,
 		"fd00:fd00::/16": false,
 	}
-	_, err = newAllowListFromConfig(c, "allowlist", nil)
+	r, err = newAllowListFromConfig(c, "allowlist", nil)
 	require.EqualError(t, err, "config `allowlist` contains both true and false rules, but no default set for ::/0")
 
 	c.Settings["allowlist"] = map[string]any{
@@ -75,7 +75,7 @@ func TestNewAllowListFromConfig(t *testing.T) {
 			`docker.*`: "foo",
 		},
 	}
-	_, err = NewLocalAllowListFromConfig(c, "allowlist")
+	lr, err := NewLocalAllowListFromConfig(c, "allowlist")
 	require.EqualError(t, err, "config `allowlist.interfaces` has invalid value (type string): foo")
 
 	c.Settings["allowlist"] = map[string]any{
@@ -84,7 +84,7 @@ func TestNewAllowListFromConfig(t *testing.T) {
 			`eth.*`:    true,
 		},
 	}
-	_, err = NewLocalAllowListFromConfig(c, "allowlist")
+	lr, err = NewLocalAllowListFromConfig(c, "allowlist")
 	require.EqualError(t, err, "config `allowlist.interfaces` values must all be the same true/false value")
 
 	c.Settings["allowlist"] = map[string]any{
@@ -92,7 +92,7 @@ func TestNewAllowListFromConfig(t *testing.T) {
 			`docker.*`: false,
 		},
 	}
-	lr, err := NewLocalAllowListFromConfig(c, "allowlist")
+	lr, err = NewLocalAllowListFromConfig(c, "allowlist")
 	if assert.NoError(t, err) {
 		assert.NotNil(t, lr)
 	}

bits.go

@@ -18,7 +18,7 @@ type Bits struct {
 func NewBits(bits uint64) *Bits {
 	return &Bits{
 		length:             bits,
-		bits:               make([]bool, bits),
+		bits:               make([]bool, bits, bits),
 		current:            0,
 		lostCounter:        metrics.GetOrRegisterCounter("network.packets.lost", nil),
 		dupeCounter:        metrics.GetOrRegisterCounter("network.packets.duplicate", nil),
@@ -28,7 +28,7 @@ func NewBits(bits uint64) *Bits {
 
 func (b *Bits) Check(l logrus.FieldLogger, i uint64) bool {
 	// If i is the next number, return true.
-	if i > b.current || (i == 0 && !b.firstSeen && b.current < b.length) {
+	if i > b.current || (i == 0 && b.firstSeen == false && b.current < b.length) {
 		return true
 	}
 
@@ -51,7 +51,7 @@ func (b *Bits) Update(l *logrus.Logger, i uint64) bool {
 	// If i is the next number, return true and update current.
 	if i == b.current+1 {
 		// Report missed packets, we can only understand what was missed after the first window has been gone through
-		if i > b.length && !b.bits[i%b.length] {
+		if i > b.length && b.bits[i%b.length] == false {
 			b.lostCounter.Inc(1)
 		}
 		b.bits[i%b.length] = true
@@ -104,7 +104,7 @@ func (b *Bits) Update(l *logrus.Logger, i uint64) bool {
 	}
 
 	// Allow for the 0 packet to come in within the first window
-	if i == 0 && !b.firstSeen && b.current < b.length {
+	if i == 0 && b.firstSeen == false && b.current < b.length {
 		b.firstSeen = true
 		b.bits[i%b.length] = true
 		return true
@@ -122,7 +122,7 @@ func (b *Bits) Update(l *logrus.Logger, i uint64) bool {
 			return false
 		}
 
-		if b.bits[i%b.length] {
+		if b.bits[i%b.length] == true {
 			if l.Level >= logrus.DebugLevel {
 				l.WithField("receiveWindow", m{"accepted": false, "currentCounter": b.current, "incomingCounter": i, "reason": "old duplicate"}).
 					Debug("Receive window")

cert/cert_v1.go

@@ -20,6 +20,8 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
+const publicKeyLen = 32
+
 type certificateV1 struct {
 	details   detailsV1
 	signature []byte

cert/cert_v2_test.go

@@ -113,14 +113,14 @@ func TestCertificateV2_MarshalJSON(t *testing.T) {
 		signature: []byte("1234567890abcedf1234567890abcedf1234567890abcedf1234567890abcedf"),
 	}
 
-	_, err := nc.MarshalJSON()
+	b, err := nc.MarshalJSON()
 	require.ErrorIs(t, err, ErrMissingDetails)
 
 	rd, err := nc.details.Marshal()
 	require.NoError(t, err)
 
 	nc.rawDetails = rd
-	b, err := nc.MarshalJSON()
+	b, err = nc.MarshalJSON()
 	require.NoError(t, err)
 	assert.JSONEq(
 		t,
@@ -174,9 +174,8 @@ func TestCertificateV2_VerifyPrivateKey(t *testing.T) {
 	require.ErrorIs(t, err, ErrInvalidPrivateKey)
 
 	c, _, priv, _ = NewTestCert(Version2, Curve_P256, ca2, caKey2, "test", time.Time{}, time.Time{}, nil, nil, nil)
-	_, _, curve, err = UnmarshalPrivateKeyFromPEM(priv)
-	assert.Equal(t, err, nil)
-	assert.Equal(t, curve, Curve_P256)
+	rawPriv, b, curve, err = UnmarshalPrivateKeyFromPEM(priv)
+
 	err = c.VerifyPrivateKey(Curve_P256, priv[:16])
 	require.ErrorIs(t, err, ErrInvalidPrivateKey)
 
@@ -262,7 +261,6 @@ func TestCertificateV2_marshalForSigningStability(t *testing.T) {
 	assert.Equal(t, expectedRawDetails, db)
 
 	expectedForSigning, err := hex.DecodeString(expectedRawDetailsStr + "00313233343536373839306162636564666768696a313233343536373839306162")
-	require.NoError(t, err)
 	b, err := nc.marshalForSigning()
 	require.NoError(t, err)
 	assert.Equal(t, expectedForSigning, b)

cert/crypto.go

@@ -227,9 +227,6 @@ func UnmarshalNebulaEncryptedData(b []byte) (*NebulaEncryptedData, error) {
 }
 
 func unmarshalArgon2Parameters(params *RawNebulaArgon2Parameters) (*Argon2Parameters, error) {
-	// Are we testing the compilers types here?
-	// No value of int32 is lewss than math.MinInt32.
-	// By definition these checks can never be true.
 	if params.Version < math.MinInt32 || params.Version > math.MaxInt32 {
 		return nil, fmt.Errorf("Argon2Parameters Version must be at least %d and no more than %d", math.MinInt32, math.MaxInt32)
 	}

cert/crypto_test.go

@@ -26,21 +26,21 @@ func TestNewArgon2Parameters(t *testing.T) {
 }
 
 func TestDecryptAndUnmarshalSigningPrivateKey(t *testing.T) {
-	passphrase := []byte("DO NOT USE THIS KEY")
+	passphrase := []byte("DO NOT USE")
 	privKey := []byte(`# A good key
 -----BEGIN NEBULA ED25519 ENCRYPTED PRIVATE KEY-----
-CjwKC0FFUy0yNTYtR0NNEi0IExCAgIABGAEgBCognnjujd67Vsv99p22wfAjQaDT
-oCMW1mdjkU3gACKNW4MSXOWR9Sts4C81yk1RUku2gvGKs3TB9LYoklLsIizSYOLl
-+Vs//O1T0I1Xbml2XBAROsb/VSoDln/6LMqR4B6fn6B3GOsLBBqRI8daDl9lRMPB
-qrlJ69wer3ZUHFXA
+CjsKC0FFUy0yNTYtR0NNEiwIExCAgAQYAyAEKiCPoDfGQiosxNPTbPn5EsMlc2MI
+c0Bt4oz6gTrFQhX3aBJcimhHKeAuhyTGvllD0Z19fe+DFPcLH3h5VrdjVfIAajg0
+KrbV3n9UHif/Au5skWmquNJzoW1E4MTdRbvpti6o+WdQ49DxjBFhx0YH8LBqrbPU
+0BGkUHmIO7daP24=
 -----END NEBULA ED25519 ENCRYPTED PRIVATE KEY-----
 `)
 	shortKey := []byte(`# A key which, once decrypted, is too short
 -----BEGIN NEBULA ED25519 ENCRYPTED PRIVATE KEY-----
-CjwKC0FFUy0yNTYtR0NNEi0IExCAgIABGAEgBCoga5h8owMEBWRSMMJKzuUvWce7
-k0qlBkQmCxiuLh80MuASW70YcKt8jeEIS2axo2V6zAKA9TSMcCsJW1kDDXEtL/xe
-GLF5T7sDl5COp4LU3pGxpV+KoeQ/S3gQCAAcnaOtnJQX+aSDnbO3jCHyP7U9CHbs
-rQr3bdH3Oy/WiYU=
+CjsKC0FFUy0yNTYtR0NNEiwIExCAgAQYAyAEKiAVJwdfl3r+eqi/vF6S7OMdpjfo
+hAzmTCRnr58Su4AqmBJbCv3zleYCEKYJP6UI3S8ekLMGISsgO4hm5leukCCyqT0Z
+cQ76yrberpzkJKoPLGisX8f+xdy4aXSZl7oEYWQte1+vqbtl/eY9PGZhxUQdcyq7
+hqzIyrRqfUgVuA==
 -----END NEBULA ED25519 ENCRYPTED PRIVATE KEY-----
 `)
 	invalidBanner := []byte(`# Invalid banner (not encrypted)
@@ -72,14 +72,12 @@ qrlJ69wer3ZUHFXA
 	require.EqualError(t, err, "key was not 64 bytes, is invalid ed25519 private key")
 	assert.Nil(t, k)
 	assert.Equal(t, rest, appendByteSlices(invalidBanner, invalidPem))
-	assert.Equal(t, curve, Curve_CURVE25519)
 
 	// Fail due to invalid banner
 	curve, k, rest, err = DecryptAndUnmarshalSigningPrivateKey(passphrase, rest)
 	require.EqualError(t, err, "bytes did not contain a proper nebula encrypted Ed25519/ECDSA private key banner")
 	assert.Nil(t, k)
 	assert.Equal(t, rest, invalidPem)
-	assert.Equal(t, curve, Curve_CURVE25519)
 
 	// Fail due to ivalid PEM format, because
 	// it's missing the requisite pre-encapsulation boundary.
@@ -87,14 +85,12 @@ qrlJ69wer3ZUHFXA
 	require.EqualError(t, err, "input did not contain a valid PEM encoded block")
 	assert.Nil(t, k)
 	assert.Equal(t, rest, invalidPem)
-	assert.Equal(t, curve, Curve_CURVE25519)
 
 	// Fail due to invalid passphrase
 	curve, k, rest, err = DecryptAndUnmarshalSigningPrivateKey([]byte("invalid passphrase"), privKey)
 	require.EqualError(t, err, "invalid passphrase or corrupt private key")
 	assert.Nil(t, k)
 	assert.Equal(t, []byte{}, rest)
-	assert.Equal(t, curve, Curve_CURVE25519)
 }
 
 func TestEncryptAndMarshalSigningPrivateKey(t *testing.T) {

cert/helper_test.go

@@ -21,9 +21,6 @@ func NewTestCaCert(version Version, curve Curve, before, after time.Time, networ
 	switch curve {
 	case Curve_CURVE25519:
 		pub, priv, err = ed25519.GenerateKey(rand.Reader)
-		if err != nil {
-			panic(err)
-		}
 	case Curve_P256:
 		privk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 		if err != nil {

cert/pem_test.go

@@ -97,14 +97,12 @@ AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 	// Fail due to short key
 	k, rest, curve, err = UnmarshalSigningPrivateKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	assert.Equal(t, rest, appendByteSlices(invalidBanner, invalidPem))
 	require.EqualError(t, err, "key was not 64 bytes, is invalid Ed25519 private key")
 
 	// Fail due to invalid banner
 	k, rest, curve, err = UnmarshalSigningPrivateKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	assert.Equal(t, rest, invalidPem)
 	require.EqualError(t, err, "bytes did not contain a proper Ed25519/ECDSA private key banner")
 
@@ -112,7 +110,6 @@ AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 	// it's missing the requisite pre-encapsulation boundary.
 	k, rest, curve, err = UnmarshalSigningPrivateKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	assert.Equal(t, rest, invalidPem)
 	require.EqualError(t, err, "input did not contain a valid PEM encoded block")
 }
@@ -162,14 +159,12 @@ AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
 	// Fail due to short key
 	k, rest, curve, err = UnmarshalPrivateKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	assert.Equal(t, rest, appendByteSlices(invalidBanner, invalidPem))
 	require.EqualError(t, err, "key was not 32 bytes, is invalid CURVE25519 private key")
 
 	// Fail due to invalid banner
 	k, rest, curve, err = UnmarshalPrivateKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	assert.Equal(t, rest, invalidPem)
 	require.EqualError(t, err, "bytes did not contain a proper private key banner")
 
@@ -177,7 +172,6 @@ AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
 	// it's missing the requisite pre-encapsulation boundary.
 	k, rest, curve, err = UnmarshalPrivateKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	assert.Equal(t, rest, invalidPem)
 	require.EqualError(t, err, "input did not contain a valid PEM encoded block")
 }
@@ -281,14 +275,12 @@ AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
 	// Fail due to short key
 	k, rest, curve, err = UnmarshalPublicKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	assert.Equal(t, rest, appendByteSlices(invalidBanner, invalidPem))
 	require.EqualError(t, err, "key was not 32 bytes, is invalid CURVE25519 public key")
 
 	// Fail due to invalid banner
 	k, rest, curve, err = UnmarshalPublicKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	require.EqualError(t, err, "bytes did not contain a proper public key banner")
 	assert.Equal(t, rest, invalidPem)
 
@@ -296,7 +288,6 @@ AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
 	// it's missing the requisite pre-encapsulation boundary.
 	k, rest, curve, err = UnmarshalPublicKeyFromPEM(rest)
 	assert.Nil(t, k)
-	assert.Equal(t, Curve_CURVE25519, curve)
 	assert.Equal(t, rest, invalidPem)
 	require.EqualError(t, err, "input did not contain a valid PEM encoded block")
 }

cert/sign_test.go

@@ -37,7 +37,6 @@ func TestCertificateV1_Sign(t *testing.T) {
 	}
 
 	pub, priv, err := ed25519.GenerateKey(rand.Reader)
-	require.NoError(t, err)
 	c, err := tbs.Sign(&certificateV1{details: detailsV1{notBefore: before, notAfter: after}}, Curve_CURVE25519, priv)
 	require.NoError(t, err)
 	assert.NotNil(t, c)

cert_test/cert.go

@@ -22,9 +22,6 @@ func NewTestCaCert(version cert.Version, curve cert.Curve, before, after time.Ti
 	switch curve {
 	case cert.Curve_CURVE25519:
 		pub, priv, err = ed25519.GenerateKey(rand.Reader)
-		if err != nil {
-			panic(err)
-		}
 	case cert.Curve_P256:
 		privk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 		if err != nil {

cmd/nebula-cert/ca.go

@@ -81,7 +81,7 @@ func parseArgonParameters(memory uint, parallelism uint, iterations uint) (*cert
 	return cert.NewArgon2Parameters(uint32(memory), uint8(parallelism), uint32(iterations)), nil
 }
 
-func ca(args []string, out io.Writer, _ io.Writer, pr PasswordReader) error {
+func ca(args []string, out io.Writer, errOut io.Writer, pr PasswordReader) error {
 	cf := newCaFlags()
 	err := cf.set.Parse(args)
 	if err != nil {

cmd/nebula-cert/keygen.go

@@ -29,7 +29,7 @@ func newKeygenFlags() *keygenFlags {
 	return &cf
 }
 
-func keygen(args []string, _ io.Writer, _ io.Writer) error {
+func keygen(args []string, out io.Writer, errOut io.Writer) error {
 	cf := newKeygenFlags()
 	err := cf.set.Parse(args)
 	if err != nil {

cmd/nebula-cert/main_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bytes"
 	"errors"
+	"fmt"
 	"io"
 	"os"
 	"testing"
@@ -76,7 +77,7 @@ func assertHelpError(t *testing.T, err error, msg string) {
 	case *helpError:
 		// good
 	default:
-		t.Fatalf("err was not a helpError: %q, expected %q", err, msg)
+		t.Fatal(fmt.Sprintf("err was not a helpError: %q, expected %q", err, msg))
 	}
 
 	require.EqualError(t, err, msg)

cmd/nebula-cert/p11_stub.go

@@ -10,7 +10,7 @@ func p11Supported() bool {
 	return false
 }
 
-func p11Flag(_ *flag.FlagSet) *string {
+func p11Flag(set *flag.FlagSet) *string {
 	var ret = ""
 	return &ret
 }

cmd/nebula-cert/print.go

@@ -1,12 +1,12 @@
 package main
 
 import (
-	"bytes"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"io"
 	"os"
+	"strings"
 
 	"github.com/skip2/go-qrcode"
 	"github.com/slackhq/nebula/cert"
@@ -29,7 +29,7 @@ func newPrintFlags() *printFlags {
 	return &pf
 }
 
-func printCert(args []string, out io.Writer, _ io.Writer) error {
+func printCert(args []string, out io.Writer, errOut io.Writer) error {
 	pf := newPrintFlags()
 	err := pf.set.Parse(args)
 	if err != nil {
@@ -72,7 +72,7 @@ func printCert(args []string, out io.Writer, _ io.Writer) error {
 			qrBytes = append(qrBytes, b...)
 		}
 
-		if len(rawCert) == 0 || len(bytes.TrimSpace(rawCert)) == 0 {
+		if rawCert == nil || len(rawCert) == 0 || strings.TrimSpace(string(rawCert)) == "" {
 			break
 		}
 

cmd/nebula-cert/verify.go

@@ -1,12 +1,12 @@
 package main
 
 import (
-	"bytes"
 	"errors"
 	"flag"
 	"fmt"
 	"io"
 	"os"
+	"strings"
 	"time"
 
 	"github.com/slackhq/nebula/cert"
@@ -52,7 +52,7 @@ func verify(args []string, out io.Writer, errOut io.Writer) error {
 			return fmt.Errorf("error while adding ca cert to pool: %w", err)
 		}
 
-		if len(rawCACert) == 0 || len(bytes.TrimSpace(rawCACert)) == 0 {
+		if rawCACert == nil || len(rawCACert) == 0 || strings.TrimSpace(string(rawCACert)) == "" {
 			break
 		}
 	}

cmd/nebula-cert/verify_test.go

@@ -97,7 +97,7 @@ func Test_verify(t *testing.T) {
 	crt, _ := NewTestCert(ca, caPriv, "test-cert", time.Now().Add(time.Hour*-1), time.Now().Add(time.Hour), nil, nil, nil)
 	// Slightly evil hack to modify the certificate after it was sealed to generate an invalid signature
 	pub := crt.PublicKey()
-	for i := range pub {
+	for i, _ := range pub {
 		pub[i] = 0
 	}
 	b, _ = crt.MarshalPEM()

cmd/nebula-service/service.go

@@ -51,7 +51,10 @@ func (p *program) Stop(s service.Service) error {
 
 func fileExists(filename string) bool {
 	_, err := os.Stat(filename)
-	return !os.IsNotExist(err)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return true
 }
 
 func doService(configPath *string, configTest *bool, build string, serviceFlag *string) {

config/config.go

@@ -11,12 +11,12 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"sync"
 	"syscall"
 	"time"
 
 	"dario.cat/mergo"
 	"github.com/sirupsen/logrus"
+	"github.com/wadey/synctrace"
 	"gopkg.in/yaml.v3"
 )
 
@@ -27,13 +27,14 @@ type C struct {
 	oldSettings map[string]any
 	callbacks   []func(*C)
 	l           *logrus.Logger
-	reloadLock  sync.Mutex
+	reloadLock  synctrace.Mutex
 }
 
 func NewC(l *logrus.Logger) *C {
 	return &C{
 		Settings:   make(map[string]any),
 		l:          l,
+		reloadLock: synctrace.NewMutex("config-reload"),
 	}
 }
 
@@ -63,7 +64,7 @@ func (c *C) Load(path string) error {
 
 func (c *C) LoadString(raw string) error {
 	if raw == "" {
-		return errors.New("empty configuration")
+		return errors.New("Empty configuration")
 	}
 	return c.parseRaw([]byte(raw))
 }

connection_manager.go

@@ -5,13 +5,13 @@ import (
 	"context"
 	"encoding/binary"
 	"net/netip"
-	"sync"
 	"time"
 
 	"github.com/rcrowley/go-metrics"
 	"github.com/sirupsen/logrus"
 	"github.com/slackhq/nebula/cert"
 	"github.com/slackhq/nebula/header"
+	"github.com/wadey/synctrace"
 )
 
 type trafficDecision int
@@ -28,14 +28,14 @@ const (
 
 type connectionManager struct {
 	in     map[uint32]struct{}
-	inLock *sync.RWMutex
+	inLock synctrace.RWMutex
 
 	out     map[uint32]struct{}
-	outLock *sync.RWMutex
+	outLock synctrace.RWMutex
 
 	// relayUsed holds which relay localIndexs are in use
 	relayUsed     map[uint32]struct{}
-	relayUsedLock *sync.RWMutex
+	relayUsedLock synctrace.RWMutex
 
 	hostMap                 *HostMap
 	trafficTimer            *LockingTimerWheel[uint32]
@@ -60,12 +60,12 @@ func newConnectionManager(ctx context.Context, l *logrus.Logger, intf *Interface
 	nc := &connectionManager{
 		hostMap:                 intf.hostMap,
 		in:                      make(map[uint32]struct{}),
-		inLock:                  &sync.RWMutex{},
+		inLock:                  synctrace.NewRWMutex("connection-manager-in"),
 		out:                     make(map[uint32]struct{}),
-		outLock:                 &sync.RWMutex{},
+		outLock:                 synctrace.NewRWMutex("connection-manager-out"),
 		relayUsed:               make(map[uint32]struct{}),
-		relayUsedLock:           &sync.RWMutex{},
-		trafficTimer:            NewLockingTimerWheel[uint32](time.Millisecond*500, max),
+		relayUsedLock:           synctrace.NewRWMutex("connection-manager-relay-used"),
+		trafficTimer:            NewLockingTimerWheel[uint32]("traffic-timer", time.Millisecond*500, max),
 		intf:                    intf,
 		pendingDeletion:         make(map[uint32]struct{}),
 		checkInterval:           checkInterval,
@@ -154,7 +154,7 @@ func (n *connectionManager) Run(ctx context.Context) {
 	defer clockSource.Stop()
 
 	p := []byte("")
-	nb := make([]byte, 12)
+	nb := make([]byte, 12, 12)
 	out := make([]byte, mtu)
 
 	for {
@@ -355,7 +355,7 @@ func (n *connectionManager) makeTrafficDecision(localIndex uint32, now time.Time
 			decision = tryRehandshake
 
 		} else {
-			if n.shouldSwapPrimary(hostinfo) {
+			if n.shouldSwapPrimary(hostinfo, primary) {
 				decision = swapPrimary
 			} else {
 				// migrate the relays to the primary, if in use.
@@ -384,7 +384,7 @@ func (n *connectionManager) makeTrafficDecision(localIndex uint32, now time.Time
 	}
 
 	decision := doNothing
-	if hostinfo.ConnectionState != nil && mainHostInfo {
+	if hostinfo != nil && hostinfo.ConnectionState != nil && mainHostInfo {
 		if !outTraffic {
 			// If we aren't sending or receiving traffic then its an unused tunnel and we don't to test the tunnel.
 			// Just maintain NAT state if configured to do so.
@@ -421,7 +421,7 @@ func (n *connectionManager) makeTrafficDecision(localIndex uint32, now time.Time
 	return decision, hostinfo, nil
 }
 
-func (n *connectionManager) shouldSwapPrimary(current *HostInfo) bool {
+func (n *connectionManager) shouldSwapPrimary(current, primary *HostInfo) bool {
 	// The primary tunnel is the most recent handshake to complete locally and should work entirely fine.
 	// If we are here then we have multiple tunnels for a host pair and neither side believes the same tunnel is primary.
 	// Let's sort this out.
@@ -498,7 +498,7 @@ func (n *connectionManager) tryRehandshake(hostinfo *HostInfo) {
 	cs := n.intf.pki.getCertState()
 	curCrt := hostinfo.ConnectionState.myCert
 	myCrt := cs.getCertificate(curCrt.Version())
-	if curCrt.Version() >= cs.initiatingVersion && bytes.Equal(curCrt.Signature(), myCrt.Signature()) {
+	if curCrt.Version() >= cs.initiatingVersion && bytes.Equal(curCrt.Signature(), myCrt.Signature()) == true {
 		// The current tunnel is using the latest certificate and version, no need to rehandshake.
 		return
 	}

connection_manager_test.go

@@ -69,7 +69,7 @@ func Test_NewConnectionManagerTest(t *testing.T) {
 	punchy := NewPunchyFromConfig(l, config.NewC(l))
 	nc := newConnectionManager(ctx, l, ifce, 5, 10, punchy)
 	p := []byte("")
-	nb := make([]byte, 12)
+	nb := make([]byte, 12, 12)
 	out := make([]byte, mtu)
 
 	// Add an ip we have established a connection w/ to hostmap
@@ -151,7 +151,7 @@ func Test_NewConnectionManagerTest2(t *testing.T) {
 	punchy := NewPunchyFromConfig(l, config.NewC(l))
 	nc := newConnectionManager(ctx, l, ifce, 5, 10, punchy)
 	p := []byte("")
-	nb := make([]byte, 12)
+	nb := make([]byte, 12, 12)
 	out := make([]byte, mtu)
 
 	// Add an ip we have established a connection w/ to hostmap
@@ -241,7 +241,7 @@ func Test_NewConnectionManagerTest_DisconnectInvalid(t *testing.T) {
 	require.NoError(t, err)
 
 	cachedPeerCert, err := ncp.VerifyCertificate(now.Add(time.Second), peerCert)
-	require.NoError(t, err)
+
 	cs := &CertState{
 		privateKey:       []byte{},
 		v1Cert:           &dummyCert{},

connection_state.go

@@ -4,13 +4,13 @@ import (
 	"crypto/rand"
 	"encoding/json"
 	"fmt"
-	"sync"
 	"sync/atomic"
 
 	"github.com/flynn/noise"
 	"github.com/sirupsen/logrus"
 	"github.com/slackhq/nebula/cert"
 	"github.com/slackhq/nebula/noiseutil"
+	"github.com/wadey/synctrace"
 )
 
 const ReplayWindow = 1024
@@ -24,7 +24,7 @@ type ConnectionState struct {
 	initiator      bool
 	messageCounter atomic.Uint64
 	window         *Bits
-	writeLock      sync.Mutex
+	writeLock      synctrace.Mutex
 }
 
 func NewConnectionState(l *logrus.Logger, cs *CertState, crt cert.Certificate, initiator bool, pattern noise.HandshakePattern) (*ConnectionState, error) {
@@ -76,6 +76,7 @@ func NewConnectionState(l *logrus.Logger, cs *CertState, crt cert.Certificate, i
 		initiator: initiator,
 		window:    b,
 		myCert:    crt,
+		writeLock: synctrace.NewMutex("connection-state"),
 	}
 	// always start the counter from 2, as packet 1 and packet 2 are handshake packets.
 	ci.messageCounter.Add(2)

control.go

@@ -131,8 +131,7 @@ func (c *Control) ListHostmapIndexes(pendingMap bool) []ControlHostInfo {
 
 // GetCertByVpnIp returns the authenticated certificate of the given vpn IP, or nil if not found
 func (c *Control) GetCertByVpnIp(vpnIp netip.Addr) cert.Certificate {
-	_, found := c.f.myVpnAddrsTable.Lookup(vpnIp)
-	if found {
+	if c.f.myVpnAddrsTable.Contains(vpnIp) {
 		// Only returning the default certificate since its impossible
 		// for any other host but ourselves to have more than 1
 		return c.f.pki.getCertState().GetDefaultCertificate().Copy()
@@ -215,7 +214,7 @@ func (c *Control) CloseTunnel(vpnIp netip.Addr, localOnly bool) bool {
 			hostInfo.ConnectionState,
 			hostInfo,
 			[]byte{},
-			make([]byte, 12),
+			make([]byte, 12, 12),
 			make([]byte, mtu),
 		)
 	}
@@ -231,7 +230,7 @@ func (c *Control) CloseAllTunnels(excludeLighthouses bool) (closed int) {
 		if excludeLighthouses && c.f.lightHouse.IsAnyLighthouseAddr(h.vpnAddrs) {
 			return
 		}
-		c.f.send(header.CloseTunnel, 0, h.ConnectionState, h, []byte{}, make([]byte, 12), make([]byte, mtu))
+		c.f.send(header.CloseTunnel, 0, h.ConnectionState, h, []byte{}, make([]byte, 12, 12), make([]byte, mtu))
 		c.f.closeTunnel(h)
 
 		c.l.WithField("vpnAddrs", h.vpnAddrs).WithField("udpAddr", h.remote).
@@ -282,7 +281,9 @@ func copyHostInfo(h *HostInfo, preferredRanges []netip.Prefix) ControlHostInfo {
 		CurrentRemote:          h.remote,
 	}
 
-	copy(chi.VpnAddrs, h.vpnAddrs)
+	for i, a := range h.vpnAddrs {
+		chi.VpnAddrs[i] = a
+	}
 
 	if h.ConnectionState != nil {
 		chi.MessageCounter = h.ConnectionState.messageCounter.Load()

control_test.go

@@ -27,10 +27,12 @@ func TestControl_GetHostInfoByVpnIp(t *testing.T) {
 
 	ipNet := net.IPNet{
 		IP:   remote1.Addr().AsSlice(),
+		Mask: net.IPMask{255, 255, 255, 0},
 	}
 
 	ipNet2 := net.IPNet{
 		IP:   remote2.Addr().AsSlice(),
+		Mask: net.IPMask{255, 255, 255, 0},
 	}
 
 	remotes := NewRemoteList([]netip.Addr{netip.IPv4Unspecified()}, nil)

dns_server.go

@@ -6,12 +6,12 @@ import (
 	"net/netip"
 	"strconv"
 	"strings"
-	"sync"
 
 	"github.com/gaissmai/bart"
 	"github.com/miekg/dns"
 	"github.com/sirupsen/logrus"
 	"github.com/slackhq/nebula/config"
+	"github.com/wadey/synctrace"
 )
 
 // This whole thing should be rewritten to use context
@@ -21,16 +21,17 @@ var dnsServer *dns.Server
 var dnsAddr string
 
 type dnsRecords struct {
-	sync.RWMutex
+	synctrace.RWMutex
 	l               *logrus.Logger
 	dnsMap4         map[string]netip.Addr
 	dnsMap6         map[string]netip.Addr
 	hostMap         *HostMap
-	myVpnAddrsTable *bart.Table[struct{}]
+	myVpnAddrsTable *bart.Lite
 }
 
 func newDnsRecords(l *logrus.Logger, cs *CertState, hostMap *HostMap) *dnsRecords {
 	return &dnsRecords{
+		RWMutex:         synctrace.NewRWMutex("dns-records"),
 		l:               l,
 		dnsMap4:         make(map[string]netip.Addr),
 		dnsMap6:         make(map[string]netip.Addr),
@@ -112,8 +113,8 @@ func (d *dnsRecords) isSelfNebulaOrLocalhost(addr string) bool {
 		return true
 	}
 
-	_, found := d.myVpnAddrsTable.Lookup(b)
-	return found //if we found it in this table, it's good
+	//if we found it in this table, it's good
+	return d.myVpnAddrsTable.Contains(b)
 }
 
 func (d *dnsRecords) parseQuery(m *dns.Msg, w dns.ResponseWriter) {

examples/config.yml

@@ -275,6 +275,10 @@ tun:
   # On linux only, set to true to manage unsafe routes directly on the system route table with gateway routes instead of
   # in nebula configuration files. Default false, not reloadable.
   #use_system_route_table: false
+  # Buffer size for reading routes updates. 0 means default system buffer size. (/proc/sys/net/core/rmem_default).
+  # If using massive routes updates, for example BGP, you may need to increase this value to avoid packet loss.
+  # SO_RCVBUFFORCE is used to avoid having to raise the system wide max
+  #use_system_route_table_buffer_size: 0
 
 # Configure logging level
 logging:

examples/go_service/main.go

@@ -5,8 +5,12 @@ import (
 	"fmt"
 	"log"
 	"net"
+	"os"
 
+	"github.com/sirupsen/logrus"
+	"github.com/slackhq/nebula"
 	"github.com/slackhq/nebula/config"
+	"github.com/slackhq/nebula/overlay"
 	"github.com/slackhq/nebula/service"
 )
 
@@ -59,7 +63,16 @@ pki:
 	if err := cfg.LoadString(configStr); err != nil {
 		return err
 	}
-	svc, err := service.New(&cfg)
+
+	logger := logrus.New()
+	logger.Out = os.Stdout
+
+	ctrl, err := nebula.Main(&cfg, false, "custom-app", logger, overlay.NewUserDeviceFromConfig)
+	if err != nil {
+		return err
+	}
+
+	svc, err := service.New(ctrl)
 	if err != nil {
 		return err
 	}

firewall.go

@@ -10,7 +10,6 @@ import (
 	"reflect"
 	"strconv"
 	"strings"
-	"sync"
 	"time"
 
 	"github.com/gaissmai/bart"
@@ -19,6 +18,7 @@ import (
 	"github.com/slackhq/nebula/cert"
 	"github.com/slackhq/nebula/config"
 	"github.com/slackhq/nebula/firewall"
+	"github.com/wadey/synctrace"
 )
 
 type FirewallInterface interface {
@@ -53,7 +53,7 @@ type Firewall struct {
 
 	// routableNetworks describes the vpn addresses as well as any unsafe networks issued to us in the certificate.
 	// The vpn addresses are a full bit match while the unsafe networks only match the prefix
-	routableNetworks *bart.Table[struct{}]
+	routableNetworks *bart.Lite
 
 	// assignedNetworks is a list of vpn networks assigned to us in the certificate.
 	assignedNetworks  []netip.Prefix
@@ -76,7 +76,7 @@ type firewallMetrics struct {
 }
 
 type FirewallConntrack struct {
-	sync.Mutex
+	synctrace.Mutex
 
 	Conns      map[firewall.Packet]*conn
 	TimerWheel *TimerWheel[firewall.Packet]
@@ -125,7 +125,7 @@ type firewallPort map[int32]*FirewallCA
 
 type firewallLocalCIDR struct {
 	Any       bool
-	LocalCIDR *bart.Table[struct{}]
+	LocalCIDR *bart.Lite
 }
 
 // NewFirewall creates a new Firewall object. A TimerWheel is created for you from the provided timeouts.
@@ -148,22 +148,23 @@ func NewFirewall(l *logrus.Logger, tcpTimeout, UDPTimeout, defaultTimeout time.D
 		tmax = defaultTimeout
 	}
 
-	routableNetworks := new(bart.Table[struct{}])
+	routableNetworks := new(bart.Lite)
 	var assignedNetworks []netip.Prefix
 	for _, network := range c.Networks() {
 		nprefix := netip.PrefixFrom(network.Addr(), network.Addr().BitLen())
-		routableNetworks.Insert(nprefix, struct{}{})
+		routableNetworks.Insert(nprefix)
 		assignedNetworks = append(assignedNetworks, network)
 	}
 
 	hasUnsafeNetworks := false
 	for _, n := range c.UnsafeNetworks() {
-		routableNetworks.Insert(n, struct{}{})
+		routableNetworks.Insert(n)
 		hasUnsafeNetworks = true
 	}
 
 	return &Firewall{
 		Conntrack: &FirewallConntrack{
+			Mutex:      synctrace.NewMutex("firewall-conntrack"),
 			Conns:      make(map[firewall.Packet]*conn),
 			TimerWheel: NewTimerWheel[firewall.Packet](tmin, tmax),
 		},
@@ -431,8 +432,7 @@ func (f *Firewall) Drop(fp firewall.Packet, incoming bool, h *HostInfo, caPool *
 
 	// Make sure remote address matches nebula certificate
 	if h.networks != nil {
-		_, ok := h.networks.Lookup(fp.RemoteAddr)
-		if !ok {
+		if !h.networks.Contains(fp.RemoteAddr) {
 			f.metrics(incoming).droppedRemoteAddr.Inc(1)
 			return ErrInvalidRemoteIP
 		}
@@ -445,8 +445,7 @@ func (f *Firewall) Drop(fp firewall.Packet, incoming bool, h *HostInfo, caPool *
 	}
 
 	// Make sure we are supposed to be handling this local ip address
-	_, ok := f.routableNetworks.Lookup(fp.LocalAddr)
-	if !ok {
+	if !f.routableNetworks.Contains(fp.LocalAddr) {
 		f.metrics(incoming).droppedLocalAddr.Inc(1)
 		return ErrInvalidLocalIP
 	}
@@ -606,7 +605,7 @@ func (f *Firewall) evict(p firewall.Packet) {
 		return
 	}
 
-	newT := time.Until(t.Expires)
+	newT := t.Expires.Sub(time.Now())
 
 	// Timeout is in the future, re-add the timer
 	if newT > 0 {
@@ -752,7 +751,7 @@ func (fc *FirewallCA) match(p firewall.Packet, c *cert.CachedCertificate, caPool
 func (fr *FirewallRule) addRule(f *Firewall, groups []string, host string, ip, localCIDR netip.Prefix) error {
 	flc := func() *firewallLocalCIDR {
 		return &firewallLocalCIDR{
-			LocalCIDR: new(bart.Table[struct{}]),
+			LocalCIDR: new(bart.Lite),
 		}
 	}
 
@@ -832,7 +831,7 @@ func (fr *FirewallRule) match(p firewall.Packet, c *cert.CachedCertificate) bool
 	}
 
 	// Shortcut path for if groups, hosts, or cidr contained an `any`
-	if fr.Any.match(p) {
+	if fr.Any.match(p, c) {
 		return true
 	}
 
@@ -849,21 +848,21 @@ func (fr *FirewallRule) match(p firewall.Packet, c *cert.CachedCertificate) bool
 			found = true
 		}
 
-		if found && sg.LocalCIDR.match(p) {
+		if found && sg.LocalCIDR.match(p, c) {
 			return true
 		}
 	}
 
 	if fr.Hosts != nil {
 		if flc, ok := fr.Hosts[c.Certificate.Name()]; ok {
-			if flc.match(p) {
+			if flc.match(p, c) {
 				return true
 			}
 		}
 	}
 
 	for _, v := range fr.CIDR.Supernets(netip.PrefixFrom(p.RemoteAddr, p.RemoteAddr.BitLen())) {
-		if v.match(p) {
+		if v.match(p, c) {
 			return true
 		}
 	}
@@ -879,7 +878,7 @@ func (flc *firewallLocalCIDR) addRule(f *Firewall, localIp netip.Prefix) error {
 		}
 
 		for _, network := range f.assignedNetworks {
-			flc.LocalCIDR.Insert(network, struct{}{})
+			flc.LocalCIDR.Insert(network)
 		}
 		return nil
 
@@ -888,11 +887,11 @@ func (flc *firewallLocalCIDR) addRule(f *Firewall, localIp netip.Prefix) error {
 		return nil
 	}
 
-	flc.LocalCIDR.Insert(localIp, struct{}{})
+	flc.LocalCIDR.Insert(localIp)
 	return nil
 }
 
-func (flc *firewallLocalCIDR) match(p firewall.Packet) bool {
+func (flc *firewallLocalCIDR) match(p firewall.Packet, c *cert.CachedCertificate) bool {
 	if flc == nil {
 		return false
 	}
@@ -901,8 +900,7 @@ func (flc *firewallLocalCIDR) match(p firewall.Packet) bool {
 		return true
 	}
 
-	_, ok := flc.LocalCIDR.Lookup(p.LocalAddr)
-	return ok
+	return flc.LocalCIDR.Contains(p.LocalAddr)
 }
 
 type rule struct {

firewall_test.go

@@ -35,27 +35,22 @@ func TestNewFirewall(t *testing.T) {
 	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Second, time.Hour, time.Minute, c)
-	conntrack = fw.Conntrack
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
 	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Hour, time.Second, time.Minute, c)
-	conntrack = fw.Conntrack
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
 	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Hour, time.Minute, time.Second, c)
-	conntrack = fw.Conntrack
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
 	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Minute, time.Hour, time.Second, c)
-	conntrack = fw.Conntrack
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
 	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 
 	fw = NewFirewall(l, time.Minute, time.Second, time.Hour, c)
-	conntrack = fw.Conntrack
 	assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
 	assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
 }

go.mod

@@ -1,6 +1,6 @@
 module github.com/slackhq/nebula
 
-go 1.23.6
+go 1.23.0
 
 toolchain go1.24.1
 
@@ -10,23 +10,24 @@ require (
 	github.com/armon/go-radix v1.0.0
 	github.com/cyberdelia/go-metrics-graphite v0.0.0-20161219230853-39f87cc3b432
 	github.com/flynn/noise v1.1.0
-	github.com/gaissmai/bart v0.20.1
+	github.com/gaissmai/bart v0.20.4
 	github.com/gogo/protobuf v1.3.2
 	github.com/google/gopacket v1.1.19
 	github.com/kardianos/service v1.2.2
 	github.com/miekg/dns v1.1.65
 	github.com/miekg/pkcs11 v1.1.2-0.20231115102856-9078ad6b9d4b
 	github.com/nbrownus/go-metrics-prometheus v0.0.0-20210712211119-974a6260965f
-	github.com/prometheus/client_golang v1.21.1
+	github.com/prometheus/client_golang v1.22.0
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475
 	github.com/sirupsen/logrus v1.9.3
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
 	github.com/stefanberger/go-pkcs11uri v0.0.0-20230803200340-78284954bff6
 	github.com/stretchr/testify v1.10.0
 	github.com/vishvananda/netlink v1.3.0
+	github.com/wadey/synctrace v0.0.0-20250612192159-94547ef50dfe
 	golang.org/x/crypto v0.37.0
 	golang.org/x/exp v0.0.0-20230725093048-515e97ebf090
-	golang.org/x/net v0.38.0
+	golang.org/x/net v0.39.0
 	golang.org/x/sync v0.13.0
 	golang.org/x/sys v0.32.0
 	golang.org/x/term v0.31.0
@@ -42,13 +43,16 @@ require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/google/btree v1.1.2 // indirect
-	github.com/klauspost/compress v1.17.11 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/heimdalr/dag v1.4.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.6.1 // indirect
 	github.com/prometheus/common v0.62.0 // indirect
 	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/timandy/routine v1.1.5 // indirect
 	github.com/vishvananda/netns v0.0.4 // indirect
 	golang.org/x/mod v0.23.0 // indirect
 	golang.org/x/time v0.5.0 // indirect

go.sum

@@ -22,10 +22,12 @@ github.com/cyberdelia/go-metrics-graphite v0.0.0-20161219230853-39f87cc3b432/go.
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/emirpasic/gods v1.18.1 h1:FXtiHYKDGKCW2KzwZKx0iC0PQmdlorYgdFG9jPXJ1Bc=
+github.com/emirpasic/gods v1.18.1/go.mod h1:8tpGGwCnJ5H4r6BWwaV6OrWmMoPhUl5jm/FMNAnJvWQ=
 github.com/flynn/noise v1.1.0 h1:KjPQoQCEFdZDiP03phOvGi11+SVVhBG2wOWAorLsstg=
 github.com/flynn/noise v1.1.0/go.mod h1:xbMo+0i6+IGbYdJhF31t2eR1BIU0CYc12+BNAKwUTag=
-github.com/gaissmai/bart v0.20.1 h1:igNss0zDsSY8e+ophKgD9KJVPKBOo7uSVjyKCL7nIzo=
-github.com/gaissmai/bart v0.20.1/go.mod h1:JJzMAhNF5Rjo4SF4jWBrANuJfqY+FvsFhW7t1UZJ+XY=
+github.com/gaissmai/bart v0.20.4 h1:Ik47r1fy3jRVU+1eYzKSW3ho2UgBVTVnUS8O993584U=
+github.com/gaissmai/bart v0.20.4/go.mod h1:cEed+ge8dalcbpi8wtS9x9m2hn/fNJH5suhdGQOHnYk=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
@@ -33,6 +35,8 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/go-test/deep v1.1.0 h1:WOcxcdHcvdgThNXjw0t76K42FXTU7HpNQWHpA2HHNlg=
+github.com/go-test/deep v1.1.0/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncVwcsE=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
@@ -53,11 +57,15 @@ github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.4.0/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/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 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=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/heimdalr/dag v1.4.0 h1:zG3JA4RDVLc55k3AXAgfwa+EgBNZ0TkfOO3C29Ucpmg=
+github.com/heimdalr/dag v1.4.0/go.mod h1:OCh6ghKmU0hPjtwMqWBoNxPmtRioKd1xSu7Zs4sbIqM=
 github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
@@ -68,8 +76,8 @@ github.com/kardianos/service v1.2.2 h1:ZvePhAHfvo0A7Mftk/tEzqEZ7Q4lgnR8sGz4xu1YX
 github.com/kardianos/service v1.2.2/go.mod h1:CIMRFEJVL+0DS1a3Nx06NaMn4Dz63Ng6O7dl0qH0zVM=
 github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
-github.com/klauspost/compress v1.17.11 h1:In6xLpyWOi1+C7tXUUWv2ot1QvBjxevKAaI6IXrJmUc=
-github.com/klauspost/compress v1.17.11/go.mod h1:pMDklpSncoRMuLFrf1W9Ss9KT+0rH90U12bZKk7uwG0=
+github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
+github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
@@ -106,8 +114,8 @@ github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXP
 github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
 github.com/prometheus/client_golang v1.7.1/go.mod h1:PY5Wy2awLA44sXw4AOSfFBetzPP4j5+D6mVACh+pe2M=
 github.com/prometheus/client_golang v1.11.0/go.mod h1:Z6t4BnS23TR94PD6BsDNk8yVqroYurpAkEiz0P2BEV0=
-github.com/prometheus/client_golang v1.21.1 h1:DOvXXTqVzvkIewV/CDPFdejpMCGeMcbGCQ8YOmu+Ibk=
-github.com/prometheus/client_golang v1.21.1/go.mod h1:U9NM32ykUErtVBxdvD3zfi+EuFkkaBvMb09mIfe0Zgg=
+github.com/prometheus/client_golang v1.22.0 h1:rb93p9lokFEsctTys46VnV1kLCDpVZ0a/Y92Vm0Zc6Q=
+github.com/prometheus/client_golang v1.22.0/go.mod h1:R7ljNsLXhuQXYZYtw6GAE9AZg8Y7vEW5scdCXrWRXC0=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.2.0/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
@@ -145,10 +153,14 @@ github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81P
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/timandy/routine v1.1.5 h1:LSpm7Iijwb9imIPlucl4krpr2EeCeAUvifiQ9Uf5X+M=
+github.com/timandy/routine v1.1.5/go.mod h1:kXslgIosdY8LW0byTyPnenDgn4/azt2euufAq9rK51w=
 github.com/vishvananda/netlink v1.3.0 h1:X7l42GfcV4S6E4vHTsw48qbrV+9PVojNfIhZcwQdrZk=
 github.com/vishvananda/netlink v1.3.0/go.mod h1:i6NetklAujEcC6fK0JPjT8qSwWyO0HLn4UKG+hGqeJs=
 github.com/vishvananda/netns v0.0.4 h1:Oeaw1EM2JMxD51g9uhtC0D7erkIjgmj8+JZc26m1YX8=
 github.com/vishvananda/netns v0.0.4/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=
+github.com/wadey/synctrace v0.0.0-20250612192159-94547ef50dfe h1:dc8Q42VsX+ABr0drJw27f3smvGfcz7eB8rJx+IkVMAo=
+github.com/wadey/synctrace v0.0.0-20250612192159-94547ef50dfe/go.mod h1:F2VCml4UxGPgAAqqm9T0ZfnVRWITrQS1EMZM+KCAm/Q=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
@@ -176,8 +188,8 @@ golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8=
-golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
+golang.org/x/net v0.39.0 h1:ZCu7HMWDxpXpaiKdhzIfaltL9Lp31x/3fCP11bc6/fY=
+golang.org/x/net v0.39.0/go.mod h1:X7NRbYVEA+ewNkCNyJ513WmMdQ3BineSwVtN2zD/d+E=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=

handshake_ix.go

@@ -9,6 +9,7 @@ import (
 	"github.com/sirupsen/logrus"
 	"github.com/slackhq/nebula/cert"
 	"github.com/slackhq/nebula/header"
+	"github.com/wadey/synctrace"
 )
 
 // NOISE IX Handshakes
@@ -192,8 +193,7 @@ func ixHandshakeStage1(f *Interface, addr netip.AddrPort, via *ViaSender, packet
 
 	for _, network := range remoteCert.Certificate.Networks() {
 		vpnAddr := network.Addr()
-		_, found := f.myVpnAddrsTable.Lookup(vpnAddr)
-		if found {
+		if f.myVpnAddrsTable.Contains(vpnAddr) {
 			f.l.WithField("vpnAddr", vpnAddr).WithField("udpAddr", addr).
 				WithField("certName", certName).
 				WithField("certVersion", certVersion).
@@ -204,7 +204,7 @@ func ixHandshakeStage1(f *Interface, addr netip.AddrPort, via *ViaSender, packet
 		}
 
 		// vpnAddrs outside our vpn networks are of no use to us, filter them out
-		if _, ok := f.myVpnNetworksTable.Lookup(vpnAddr); !ok {
+		if !f.myVpnNetworksTable.Contains(vpnAddr) {
 			continue
 		}
 
@@ -250,6 +250,7 @@ func ixHandshakeStage1(f *Interface, addr netip.AddrPort, via *ViaSender, packet
 		HandshakePacket:   make(map[uint8][]byte, 0),
 		lastHandshakeTime: hs.Details.Time,
 		relayState: RelayState{
+			RWMutex:        synctrace.NewRWMutex("relay-state"),
 			relays:         map[netip.Addr]struct{}{},
 			relayForByAddr: map[netip.Addr]*Relay{},
 			relayForByIdx:  map[uint32]*Relay{},
@@ -343,7 +344,7 @@ func ixHandshakeStage1(f *Interface, addr netip.AddrPort, via *ViaSender, packet
 			if existing.SetRemoteIfPreferred(f.hostMap, addr) {
 				// Send a test packet to ensure the other side has also switched to
 				// the preferred remote
-				f.SendMessageToVpnAddr(header.Test, header.TestRequest, vpnAddrs[0], []byte(""), make([]byte, 12), make([]byte, mtu))
+				f.SendMessageToVpnAddr(header.Test, header.TestRequest, vpnAddrs[0], []byte(""), make([]byte, 12, 12), make([]byte, mtu))
 			}
 
 			msg = existing.HandshakePacket[2]
@@ -386,7 +387,7 @@ func ixHandshakeStage1(f *Interface, addr netip.AddrPort, via *ViaSender, packet
 				Info("Handshake too old")
 
 			// Send a test packet to trigger an authenticated tunnel test, this should suss out any lingering tunnel issues
-			f.SendMessageToVpnAddr(header.Test, header.TestRequest, vpnAddrs[0], []byte(""), make([]byte, 12), make([]byte, mtu))
+			f.SendMessageToVpnAddr(header.Test, header.TestRequest, vpnAddrs[0], []byte(""), make([]byte, 12, 12), make([]byte, mtu))
 			return
 		case ErrLocalIndexCollision:
 			// This means we failed to insert because of collision on localIndexId. Just let the next handshake packet retry
@@ -461,6 +462,8 @@ func ixHandshakeStage1(f *Interface, addr netip.AddrPort, via *ViaSender, packet
 	f.connectionManager.AddTrafficWatch(hostinfo.localIndexId)
 
 	hostinfo.remotes.ResetBlockedRemotes()
+
+	return
 }
 
 func ixHandshakeStage2(f *Interface, addr netip.AddrPort, via *ViaSender, hh *HandshakeHostInfo, packet []byte, h *header.H) bool {
@@ -577,7 +580,7 @@ func ixHandshakeStage2(f *Interface, addr netip.AddrPort, via *ViaSender, hh *Ha
 	for _, network := range vpnNetworks {
 		// vpnAddrs outside our vpn networks are of no use to us, filter them out
 		vpnAddr := network.Addr()
-		if _, ok := f.myVpnNetworksTable.Lookup(vpnAddr); !ok {
+		if !f.myVpnNetworksTable.Contains(vpnAddr) {
 			continue
 		}
 
@@ -658,7 +661,7 @@ func ixHandshakeStage2(f *Interface, addr netip.AddrPort, via *ViaSender, hh *Ha
 	}
 
 	if len(hh.packetStore) > 0 {
-		nb := make([]byte, 12)
+		nb := make([]byte, 12, 12)
 		out := make([]byte, mtu)
 		for _, cp := range hh.packetStore {
 			cp.callback(cp.messageType, cp.messageSubType, hostinfo, cp.packet, nb, out)

handshake_manager.go

@@ -8,7 +8,6 @@ import (
 	"errors"
 	"net/netip"
 	"slices"
-	"sync"
 	"time"
 
 	"github.com/rcrowley/go-metrics"
@@ -16,6 +15,7 @@ import (
 	"github.com/slackhq/nebula/cert"
 	"github.com/slackhq/nebula/header"
 	"github.com/slackhq/nebula/udp"
+	"github.com/wadey/synctrace"
 )
 
 const (
@@ -45,7 +45,7 @@ type HandshakeConfig struct {
 
 type HandshakeManager struct {
 	// Mutex for interacting with the vpnIps and indexes maps
-	sync.RWMutex
+	synctrace.RWMutex
 
 	vpnIps  map[netip.Addr]*HandshakeHostInfo
 	indexes map[uint32]*HandshakeHostInfo
@@ -66,7 +66,7 @@ type HandshakeManager struct {
 }
 
 type HandshakeHostInfo struct {
-	sync.Mutex
+	synctrace.Mutex
 
 	startTime   time.Time        // Time that we first started trying with this handshake
 	ready       bool             // Is the handshake ready
@@ -104,6 +104,7 @@ func (hh *HandshakeHostInfo) cachePacket(l *logrus.Logger, t header.MessageType,
 
 func NewHandshakeManager(l *logrus.Logger, mainHostMap *HostMap, lightHouse *LightHouse, outside udp.Conn, config HandshakeConfig) *HandshakeManager {
 	return &HandshakeManager{
+		RWMutex:                synctrace.NewRWMutex("handshake-manager"),
 		vpnIps:                 map[netip.Addr]*HandshakeHostInfo{},
 		indexes:                map[uint32]*HandshakeHostInfo{},
 		mainHostMap:            mainHostMap,
@@ -111,7 +112,7 @@ func NewHandshakeManager(l *logrus.Logger, mainHostMap *HostMap, lightHouse *Lig
 		outside:                outside,
 		config:                 config,
 		trigger:                make(chan netip.Addr, config.triggerBuffer),
-		OutboundHandshakeTimer: NewLockingTimerWheel[netip.Addr](config.tryInterval, hsTimeout(config.retries, config.tryInterval)),
+		OutboundHandshakeTimer: NewLockingTimerWheel[netip.Addr]("outbound-handshake-timer", config.tryInterval, hsTimeout(config.retries, config.tryInterval)),
 		messageMetrics:         config.messageMetrics,
 		metricInitiated:        metrics.GetOrRegisterCounter("handshake_manager.initiated", nil),
 		metricTimedOut:         metrics.GetOrRegisterCounter("handshake_manager.timed_out", nil),
@@ -274,8 +275,7 @@ func (hm *HandshakeManager) handleOutbound(vpnIp netip.Addr, lighthouseTriggered
 			}
 
 			// Don't relay through the host I'm trying to connect to
-			_, found := hm.f.myVpnAddrsTable.Lookup(relay)
-			if found {
+			if hm.f.myVpnAddrsTable.Contains(relay) {
 				continue
 			}
 
@@ -451,6 +451,7 @@ func (hm *HandshakeManager) StartHandshake(vpnAddr netip.Addr, cacheCb func(*Han
 		vpnAddrs:        []netip.Addr{vpnAddr},
 		HandshakePacket: make(map[uint8][]byte, 0),
 		relayState: RelayState{
+			RWMutex:        synctrace.NewRWMutex("relay-state"),
 			relays:         map[netip.Addr]struct{}{},
 			relayForByAddr: map[netip.Addr]*Relay{},
 			relayForByIdx:  map[uint32]*Relay{},
@@ -458,6 +459,7 @@ func (hm *HandshakeManager) StartHandshake(vpnAddr netip.Addr, cacheCb func(*Han
 	}
 
 	hh := &HandshakeHostInfo{
+		Mutex:     synctrace.NewMutex("handshake-hostinfo"),
 		hostinfo:  hostinfo,
 		startTime: time.Now(),
 	}

handshake_manager_test.go

@@ -65,16 +65,30 @@ func Test_NewHandshakeManagerVpnIp(t *testing.T) {
 	assert.NotContains(t, blah.vpnIps, ip)
 }
 
+func testCountTimerWheelEntries(tw *LockingTimerWheel[netip.Addr]) (c int) {
+	for _, i := range tw.t.wheel {
+		n := i.Head
+		for n != nil {
+			c++
+			n = n.Next
+		}
+	}
+	return c
+}
+
 type mockEncWriter struct {
 }
 
 func (mw *mockEncWriter) SendMessageToVpnAddr(_ header.MessageType, _ header.MessageSubType, _ netip.Addr, _, _, _ []byte) {
+	return
 }
 
 func (mw *mockEncWriter) SendVia(_ *HostInfo, _ *Relay, _, _, _ []byte, _ bool) {
+	return
 }
 
 func (mw *mockEncWriter) SendMessageToHostInfo(_ header.MessageType, _ header.MessageSubType, _ *HostInfo, _, _, _ []byte) {
+	return
 }
 
 func (mw *mockEncWriter) Handshake(_ netip.Addr) {}

header/header.go

@@ -23,7 +23,7 @@ type m = map[string]any
 
 const (
 	Version uint8 = 1
-	Len     int   = 16
+	Len           = 16
 )
 
 type MessageType uint8

hostmap.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"net"
 	"net/netip"
-	"sync"
 	"sync/atomic"
 	"time"
 
@@ -14,6 +13,7 @@ import (
 	"github.com/slackhq/nebula/cert"
 	"github.com/slackhq/nebula/config"
 	"github.com/slackhq/nebula/header"
+	"github.com/wadey/synctrace"
 )
 
 // const ProbeLen = 100
@@ -53,7 +53,7 @@ type Relay struct {
 }
 
 type HostMap struct {
-	sync.RWMutex    //Because we concurrently read and write to our maps
+	synctrace.RWMutex //Because we concurrently read and write to our maps
 	Indexes           map[uint32]*HostInfo
 	Relays            map[uint32]*HostInfo // Maps a Relay IDX to a Relay HostInfo object
 	RemoteIndexes     map[uint32]*HostInfo
@@ -66,7 +66,7 @@ type HostMap struct {
 // struct, make a copy of an existing value, edit the fileds in the copy, and
 // then store a pointer to the new copy in both realyForBy* maps.
 type RelayState struct {
-	sync.RWMutex
+	synctrace.RWMutex
 
 	relays map[netip.Addr]struct{} // Set of vpnAddr's of Hosts to use as relays to access this peer
 	// For data race avoidance, the contents of a *Relay are treated immutably. To update a *Relay, copy the existing data,
@@ -223,7 +223,7 @@ type HostInfo struct {
 	recvError atomic.Uint32
 
 	// networks are both all vpn and unsafe networks assigned to this host
-	networks   *bart.Table[struct{}]
+	networks   *bart.Lite
 	relayState RelayState
 
 	// HandshakePacket records the packets used to create this hostinfo
@@ -288,6 +288,7 @@ func NewHostMapFromConfig(l *logrus.Logger, c *config.C) *HostMap {
 
 func newHostMap(l *logrus.Logger) *HostMap {
 	return &HostMap{
+		RWMutex:       synctrace.NewRWMutex("hostmap"),
 		Indexes:       map[uint32]*HostInfo{},
 		Relays:        map[uint32]*HostInfo{},
 		RemoteIndexes: map[uint32]*HostInfo{},
@@ -568,7 +569,7 @@ func (hm *HostMap) unlockedAddHostInfo(hostinfo *HostInfo, f *Interface) {
 		dnsR.Add(remoteCert.Certificate.Name()+".", hostinfo.vpnAddrs)
 	}
 	for _, addr := range hostinfo.vpnAddrs {
-		hm.unlockedInnerAddHostInfo(addr, hostinfo)
+		hm.unlockedInnerAddHostInfo(addr, hostinfo, f)
 	}
 
 	hm.Indexes[hostinfo.localIndexId] = hostinfo
@@ -581,7 +582,7 @@ func (hm *HostMap) unlockedAddHostInfo(hostinfo *HostInfo, f *Interface) {
 	}
 }
 
-func (hm *HostMap) unlockedInnerAddHostInfo(vpnAddr netip.Addr, hostinfo *HostInfo) {
+func (hm *HostMap) unlockedInnerAddHostInfo(vpnAddr netip.Addr, hostinfo *HostInfo, f *Interface) {
 	existing := hm.Hosts[vpnAddr]
 	hm.Hosts[vpnAddr] = hostinfo
 
@@ -648,7 +649,7 @@ func (i *HostInfo) TryPromoteBest(preferredRanges []netip.Prefix, ifce *Interfac
 
 			// Try to send a test packet to that host, this should
 			// cause it to detect a roaming event and switch remotes
-			ifce.sendTo(header.Test, header.TestRequest, i.ConnectionState, i, addr, []byte(""), make([]byte, 12), make([]byte, mtu))
+			ifce.sendTo(header.Test, header.TestRequest, i.ConnectionState, i, addr, []byte(""), make([]byte, 12, 12), make([]byte, mtu))
 		})
 	}
 
@@ -732,13 +733,13 @@ func (i *HostInfo) buildNetworks(networks, unsafeNetworks []netip.Prefix) {
 		return
 	}
 
-	i.networks = new(bart.Table[struct{}])
+	i.networks = new(bart.Lite)
 	for _, network := range networks {
-		i.networks.Insert(network, struct{}{})
+		i.networks.Insert(network)
 	}
 
 	for _, network := range unsafeNetworks {
-		i.networks.Insert(network, struct{}{})
+		i.networks.Insert(network)
 	}
 }
 
@@ -794,7 +795,7 @@ func localAddrs(l *logrus.Logger, allowList *LocalAllowList) []netip.Addr {
 			}
 			addr = addr.Unmap()
 
-			if !addr.IsLoopback() && !addr.IsLinkLocalUnicast() {
+			if addr.IsLoopback() == false && addr.IsLinkLocalUnicast() == false {
 				isAllowed := allowList.Allow(addr)
 				if l.Level >= logrus.TraceLevel {
 					l.WithField("localAddr", addr).WithField("allowed", isAllowed).Trace("localAllowList.Allow")

inside.go

@@ -22,14 +22,12 @@ func (f *Interface) consumeInsidePacket(packet []byte, fwPacket *firewall.Packet
 
 	// Ignore local broadcast packets
 	if f.dropLocalBroadcast {
-		_, found := f.myBroadcastAddrsTable.Lookup(fwPacket.RemoteAddr)
-		if found {
+		if f.myBroadcastAddrsTable.Contains(fwPacket.RemoteAddr) {
 			return
 		}
 	}
 
-	_, found := f.myVpnAddrsTable.Lookup(fwPacket.RemoteAddr)
-	if found {
+	if f.myVpnAddrsTable.Contains(fwPacket.RemoteAddr) {
 		// Immediately forward packets from self to self.
 		// This should only happen on Darwin-based and FreeBSD hosts, which
 		// routes packets from the Nebula addr to the Nebula addr through the Nebula
@@ -130,8 +128,7 @@ func (f *Interface) Handshake(vpnAddr netip.Addr) {
 // getOrHandshakeNoRouting returns nil if the vpnAddr is not routable.
 // If the 2nd return var is false then the hostinfo is not ready to be used in a tunnel
 func (f *Interface) getOrHandshakeNoRouting(vpnAddr netip.Addr, cacheCallback func(*HandshakeHostInfo)) (*HostInfo, bool) {
-	_, found := f.myVpnNetworksTable.Lookup(vpnAddr)
-	if found {
+	if f.myVpnNetworksTable.Contains(vpnAddr) {
 		return f.handshakeManager.GetOrHandshake(vpnAddr, cacheCallback)
 	}
 

interface.go

@@ -61,11 +61,11 @@ type Interface struct {
 	serveDns              bool
 	createTime            time.Time
 	lightHouse            *LightHouse
-	myBroadcastAddrsTable *bart.Table[struct{}]
+	myBroadcastAddrsTable *bart.Lite
 	myVpnAddrs            []netip.Addr // A list of addresses assigned to us via our certificate
-	myVpnAddrsTable       *bart.Table[struct{}] // A table of addresses assigned to us via our certificate
+	myVpnAddrsTable       *bart.Lite
 	myVpnNetworks         []netip.Prefix // A list of networks assigned to us via our certificate
-	myVpnNetworksTable    *bart.Table[struct{}] // A table of networks assigned to us via our certificate
+	myVpnNetworksTable    *bart.Lite
 	dropLocalBroadcast    bool
 	dropMulticast         bool
 	routines              int
@@ -266,7 +266,7 @@ func (f *Interface) listenOut(i int) {
 	plaintext := make([]byte, udp.MTU)
 	h := &header.H{}
 	fwPacket := &firewall.Packet{}
-	nb := make([]byte, 12)
+	nb := make([]byte, 12, 12)
 
 	li.ListenOut(func(fromUdpAddr netip.AddrPort, payload []byte) {
 		f.readOutsidePackets(fromUdpAddr, nil, plaintext[:0], payload, h, fwPacket, lhh, nb, i, ctCache.Get(f.l))
@@ -279,7 +279,7 @@ func (f *Interface) listenIn(reader io.ReadWriteCloser, i int) {
 	packet := make([]byte, mtu)
 	out := make([]byte, mtu)
 	fwPacket := &firewall.Packet{}
-	nb := make([]byte, 12)
+	nb := make([]byte, 12, 12)
 
 	conntrackCache := firewall.NewConntrackCacheTicker(f.conntrackCacheTimeout)
 
@@ -322,7 +322,7 @@ func (f *Interface) reloadDisconnectInvalid(c *config.C) {
 
 func (f *Interface) reloadFirewall(c *config.C) {
 	//TODO: need to trigger/detect if the certificate changed too
-	if !c.HasChanged("firewall") {
+	if c.HasChanged("firewall") == false {
 		f.l.Debug("No firewall config change detected")
 		return
 	}
@@ -424,7 +424,7 @@ func (f *Interface) emitStats(ctx context.Context, i time.Duration) {
 
 			certState := f.pki.getCertState()
 			defaultCrt := certState.GetDefaultCertificate()
-			certExpirationGauge.Update(int64(time.Until(defaultCrt.NotAfter()) / time.Second))
+			certExpirationGauge.Update(int64(defaultCrt.NotAfter().Sub(time.Now()) / time.Second))
 			certInitiatingVersion.Update(int64(defaultCrt.Version()))
 
 			// Report the max certificate version we are capable of using

lighthouse.go

@@ -9,7 +9,6 @@ import (
 	"net/netip"
 	"slices"
 	"strconv"
-	"sync"
 	"sync/atomic"
 	"time"
 
@@ -21,18 +20,19 @@ import (
 	"github.com/slackhq/nebula/header"
 	"github.com/slackhq/nebula/udp"
 	"github.com/slackhq/nebula/util"
+	"github.com/wadey/synctrace"
 )
 
 var ErrHostNotKnown = errors.New("host not known")
 
 type LightHouse struct {
 	//TODO: We need a timer wheel to kick out vpnAddrs that haven't reported in a long time
-	sync.RWMutex //Because we concurrently read and write to our maps
+	synctrace.RWMutex //Because we concurrently read and write to our maps
 	ctx               context.Context
 	amLighthouse      bool
 
 	myVpnNetworks      []netip.Prefix
-	myVpnNetworksTable *bart.Table[struct{}]
+	myVpnNetworksTable *bart.Lite
 	punchConn          udp.Conn
 	punchy             *Punchy
 
@@ -96,6 +96,7 @@ func NewLightHouseFromConfig(ctx context.Context, l *logrus.Logger, c *config.C,
 	}
 
 	h := LightHouse{
+		RWMutex:            synctrace.NewRWMutex("lighthouse"),
 		ctx:                ctx,
 		amLighthouse:       amLighthouse,
 		myVpnNetworks:      cs.myVpnNetworks,
@@ -201,8 +202,7 @@ func (lh *LightHouse) reload(c *config.C, initial bool) error {
 
 			//TODO: we could technically insert all returned addrs instead of just the first one if a dns lookup was used
 			addr := addrs[0].Unmap()
-			_, found := lh.myVpnNetworksTable.Lookup(addr)
-			if found {
+			if lh.myVpnNetworksTable.Contains(addr) {
 				lh.l.WithField("addr", rawAddr).WithField("entry", i+1).
 					Warn("Ignoring lighthouse.advertise_addrs report because it is within the nebula network range")
 				continue
@@ -359,8 +359,7 @@ func (lh *LightHouse) parseLighthouses(c *config.C, lhMap map[netip.Addr]struct{
 			return util.NewContextualError("Unable to parse lighthouse host entry", m{"host": host, "entry": i + 1}, err)
 		}
 
-		_, found := lh.myVpnNetworksTable.Lookup(addr)
-		if !found {
+		if !lh.myVpnNetworksTable.Contains(addr) {
 			return util.NewContextualError("lighthouse host is not in our networks, invalid", m{"vpnAddr": addr, "networks": lh.myVpnNetworks}, nil)
 		}
 		lhMap[addr] = struct{}{}
@@ -371,7 +370,7 @@ func (lh *LightHouse) parseLighthouses(c *config.C, lhMap map[netip.Addr]struct{
 	}
 
 	staticList := lh.GetStaticHostList()
-	for lhAddr := range lhMap {
+	for lhAddr, _ := range lhMap {
 		if _, ok := staticList[lhAddr]; !ok {
 			return fmt.Errorf("lighthouse %s does not have a static_host_map entry", lhAddr)
 		}
@@ -431,8 +430,7 @@ func (lh *LightHouse) loadStaticMap(c *config.C, staticList map[netip.Addr]struc
 			return util.NewContextualError("Unable to parse static_host_map entry", m{"host": k, "entry": i + 1}, err)
 		}
 
-		_, found := lh.myVpnNetworksTable.Lookup(vpnAddr)
-		if !found {
+		if !lh.myVpnNetworksTable.Contains(vpnAddr) {
 			return util.NewContextualError("static_host_map key is not in our network, invalid", m{"vpnAddr": vpnAddr, "networks": lh.myVpnNetworks, "entry": i + 1}, nil)
 		}
 
@@ -475,6 +473,7 @@ func (lh *LightHouse) QueryServer(vpnAddr netip.Addr) {
 		return
 	}
 
+	synctrace.ChanDebugSend("lighthouse-querychan")
 	lh.queryChan <- vpnAddr
 }
 
@@ -653,9 +652,11 @@ func (lh *LightHouse) shouldAdd(vpnAddr netip.Addr, to netip.Addr) bool {
 		return false
 	}
 
-	_, found := lh.myVpnNetworksTable.Lookup(to)
+	if lh.myVpnNetworksTable.Contains(to) {
+		return false
+	}
 
-	return !found
+	return true
 }
 
 // unlockedShouldAddV4 checks if to is allowed by our allow list
@@ -671,8 +672,11 @@ func (lh *LightHouse) unlockedShouldAddV4(vpnAddr netip.Addr, to *V4AddrPort) bo
 		return false
 	}
 
-	_, found := lh.myVpnNetworksTable.Lookup(udpAddr.Addr())
-	return !found
+	if lh.myVpnNetworksTable.Contains(udpAddr.Addr()) {
+		return false
+	}
+
+	return true
 }
 
 // unlockedShouldAddV6 checks if to is allowed by our allow list
@@ -688,9 +692,11 @@ func (lh *LightHouse) unlockedShouldAddV6(vpnAddr netip.Addr, to *V6AddrPort) bo
 		return false
 	}
 
-	_, found := lh.myVpnNetworksTable.Lookup(udpAddr.Addr())
+	if lh.myVpnNetworksTable.Contains(udpAddr.Addr()) {
+		return false
+	}
 
-	return !found
+	return true
 }
 
 func (lh *LightHouse) IsLighthouseAddr(vpnAddr netip.Addr) bool {
@@ -718,12 +724,14 @@ func (lh *LightHouse) startQueryWorker() {
 	}
 
 	go func() {
-		nb := make([]byte, 12)
+		nb := make([]byte, 12, 12)
 		out := make([]byte, mtu)
 
+		synctrace.ChanDebugRecvLock("lighthouse-querychan")
 		for {
 			select {
 			case <-lh.ctx.Done():
+				synctrace.ChanDebugRecvUnlock("lighthouse-querychan")
 				return
 			case addr := <-lh.queryChan:
 				lh.innerQueryServer(addr, nb, out)
@@ -846,8 +854,7 @@ func (lh *LightHouse) SendUpdate() {
 
 	lal := lh.GetLocalAllowList()
 	for _, e := range localAddrs(lh.l, lal) {
-		_, found := lh.myVpnNetworksTable.Lookup(e)
-		if found {
+		if lh.myVpnNetworksTable.Contains(e) {
 			continue
 		}
 
@@ -859,7 +866,7 @@ func (lh *LightHouse) SendUpdate() {
 		}
 	}
 
-	nb := make([]byte, 12)
+	nb := make([]byte, 12, 12)
 	out := make([]byte, mtu)
 
 	var v1Update, v2Update []byte
@@ -961,7 +968,7 @@ type LightHouseHandler struct {
 func (lh *LightHouse) NewRequestHandler() *LightHouseHandler {
 	lhh := &LightHouseHandler{
 		lh:  lh,
-		nb:  make([]byte, 12),
+		nb:  make([]byte, 12, 12),
 		out: make([]byte, mtu),
 		l:   lh.l,
 		pb:  make([]byte, mtu),
@@ -1152,7 +1159,7 @@ func (lhh *LightHouseHandler) coalesceAnswers(v cert.Version, c *cache, n *Nebul
 		if c.v4.learned != nil {
 			n.Details.V4AddrPorts = append(n.Details.V4AddrPorts, c.v4.learned)
 		}
-		if len(c.v4.reported) > 0 {
+		if c.v4.reported != nil && len(c.v4.reported) > 0 {
 			n.Details.V4AddrPorts = append(n.Details.V4AddrPorts, c.v4.reported...)
 		}
 	}
@@ -1161,7 +1168,7 @@ func (lhh *LightHouseHandler) coalesceAnswers(v cert.Version, c *cache, n *Nebul
 		if c.v6.learned != nil {
 			n.Details.V6AddrPorts = append(n.Details.V6AddrPorts, c.v6.learned)
 		}
-		if len(c.v6.reported) > 0 {
+		if c.v6.reported != nil && len(c.v6.reported) > 0 {
 			n.Details.V6AddrPorts = append(n.Details.V6AddrPorts, c.v6.reported...)
 		}
 	}
@@ -1359,7 +1366,7 @@ func (lhh *LightHouseHandler) handleHostPunchNotification(n *NebulaMeta, fromVpn
 			//NOTE: we have to allocate a new output buffer here since we are spawning a new goroutine
 			// for each punchBack packet. We should move this into a timerwheel or a single goroutine
 			// managed by a channel.
-			w.SendMessageToVpnAddr(header.Test, header.TestRequest, queryVpnAddr, []byte(""), make([]byte, 12), make([]byte, mtu))
+			w.SendMessageToVpnAddr(header.Test, header.TestRequest, queryVpnAddr, []byte(""), make([]byte, 12, 12), make([]byte, mtu))
 		}()
 	}
 }

lighthouse_test.go

@@ -31,8 +31,8 @@ func TestOldIPv4Only(t *testing.T) {
 func Test_lhStaticMapping(t *testing.T) {
 	l := test.NewLogger()
 	myVpnNet := netip.MustParsePrefix("10.128.0.1/16")
-	nt := new(bart.Table[struct{}])
-	nt.Insert(myVpnNet, struct{}{})
+	nt := new(bart.Lite)
+	nt.Insert(myVpnNet)
 	cs := &CertState{
 		myVpnNetworks:      []netip.Prefix{myVpnNet},
 		myVpnNetworksTable: nt,
@@ -56,8 +56,8 @@ func Test_lhStaticMapping(t *testing.T) {
 func TestReloadLighthouseInterval(t *testing.T) {
 	l := test.NewLogger()
 	myVpnNet := netip.MustParsePrefix("10.128.0.1/16")
-	nt := new(bart.Table[struct{}])
-	nt.Insert(myVpnNet, struct{}{})
+	nt := new(bart.Lite)
+	nt.Insert(myVpnNet)
 	cs := &CertState{
 		myVpnNetworks:      []netip.Prefix{myVpnNet},
 		myVpnNetworksTable: nt,
@@ -91,8 +91,8 @@ func TestReloadLighthouseInterval(t *testing.T) {
 func BenchmarkLighthouseHandleRequest(b *testing.B) {
 	l := test.NewLogger()
 	myVpnNet := netip.MustParsePrefix("10.128.0.1/0")
-	nt := new(bart.Table[struct{}])
-	nt.Insert(myVpnNet, struct{}{})
+	nt := new(bart.Lite)
+	nt.Insert(myVpnNet)
 	cs := &CertState{
 		myVpnNetworks:      []netip.Prefix{myVpnNet},
 		myVpnNetworksTable: nt,
@@ -196,8 +196,8 @@ func TestLighthouse_Memory(t *testing.T) {
 	c.Settings["listen"] = map[string]any{"port": 4242}
 
 	myVpnNet := netip.MustParsePrefix("10.128.0.1/24")
-	nt := new(bart.Table[struct{}])
-	nt.Insert(myVpnNet, struct{}{})
+	nt := new(bart.Lite)
+	nt.Insert(myVpnNet)
 	cs := &CertState{
 		myVpnNetworks:      []netip.Prefix{myVpnNet},
 		myVpnNetworksTable: nt,
@@ -281,8 +281,8 @@ func TestLighthouse_reload(t *testing.T) {
 	c.Settings["listen"] = map[string]any{"port": 4242}
 
 	myVpnNet := netip.MustParsePrefix("10.128.0.1/24")
-	nt := new(bart.Table[struct{}])
-	nt.Insert(myVpnNet, struct{}{})
+	nt := new(bart.Lite)
+	nt.Insert(myVpnNet)
 	cs := &CertState{
 		myVpnNetworks:      []netip.Prefix{myVpnNet},
 		myVpnNetworksTable: nt,
@@ -484,12 +484,12 @@ func Test_findNetworkUnion(t *testing.T) {
 	assert.Equal(t, out, afe81)
 
 	//falsey cases
-	_, ok = findNetworkUnion([]netip.Prefix{oneSevenTwo, fe80}, []netip.Addr{a1})
+	out, ok = findNetworkUnion([]netip.Prefix{oneSevenTwo, fe80}, []netip.Addr{a1})
 	assert.False(t, ok)
-	_, ok = findNetworkUnion([]netip.Prefix{fc00, fe80}, []netip.Addr{a1})
+	out, ok = findNetworkUnion([]netip.Prefix{fc00, fe80}, []netip.Addr{a1})
 	assert.False(t, ok)
-	_, ok = findNetworkUnion([]netip.Prefix{oneSevenTwo, fc00}, []netip.Addr{a1, afe81})
+	out, ok = findNetworkUnion([]netip.Prefix{oneSevenTwo, fc00}, []netip.Addr{a1, afe81})
 	assert.False(t, ok)
-	_, ok = findNetworkUnion([]netip.Prefix{fc00}, []netip.Addr{a1, afe81})
+	out, ok = findNetworkUnion([]netip.Prefix{fc00}, []netip.Addr{a1, afe81})
 	assert.False(t, ok)
 }

message_metrics.go

@@ -17,7 +17,7 @@ type MessageMetrics struct {
 
 func (m *MessageMetrics) Rx(t header.MessageType, s header.MessageSubType, i int64) {
 	if m != nil {
-		if int(t) < len(m.rx) && int(s) < len(m.rx[t]) {
+		if t >= 0 && int(t) < len(m.rx) && s >= 0 && int(s) < len(m.rx[t]) {
 			m.rx[t][s].Inc(i)
 		} else if m.rxUnknown != nil {
 			m.rxUnknown.Inc(i)
@@ -26,7 +26,7 @@ func (m *MessageMetrics) Rx(t header.MessageType, s header.MessageSubType, i int
 }
 func (m *MessageMetrics) Tx(t header.MessageType, s header.MessageSubType, i int64) {
 	if m != nil {
-		if int(t) < len(m.tx) && int(s) < len(m.tx[t]) {
+		if t >= 0 && int(t) < len(m.tx) && s >= 0 && int(s) < len(m.tx[t]) {
 			m.tx[t][s].Inc(i)
 		} else if m.txUnknown != nil {
 			m.txUnknown.Inc(i)

outside.go

@@ -31,8 +31,7 @@ func (f *Interface) readOutsidePackets(ip netip.AddrPort, via *ViaSender, out []
 
 	//l.Error("in packet ", header, packet[HeaderLen:])
 	if ip.IsValid() {
-		_, found := f.myVpnNetworksTable.Lookup(ip.Addr())
-		if found {
+		if f.myVpnNetworksTable.Contains(ip.Addr()) {
 			if f.l.Level >= logrus.DebugLevel {
 				f.l.WithField("udpAddr", ip).Debug("Refusing to process double encrypted packet")
 			}
@@ -228,7 +227,7 @@ func (f *Interface) closeTunnel(hostInfo *HostInfo) {
 
 // sendCloseTunnel is a helper function to send a proper close tunnel packet to a remote
 func (f *Interface) sendCloseTunnel(h *HostInfo) {
-	f.send(header.CloseTunnel, 0, h.ConnectionState, h, []byte{}, make([]byte, 12), make([]byte, mtu))
+	f.send(header.CloseTunnel, 0, h.ConnectionState, h, []byte{}, make([]byte, 12, 12), make([]byte, mtu))
 }
 
 func (f *Interface) handleHostRoaming(hostinfo *HostInfo, udpAddr netip.AddrPort) {
@@ -313,12 +312,11 @@ func parseV6(data []byte, incoming bool, fp *firewall.Packet) error {
 	offset := ipv6.HeaderLen // Start at the end of the ipv6 header
 	next := 0
 	for {
-		if dataLen < offset {
+		if protoAt >= dataLen {
 			break
 		}
-
 		proto := layers.IPProtocol(data[protoAt])
-		//fmt.Println(proto, protoAt)
+
 		switch proto {
 		case layers.IPProtocolICMPv6, layers.IPProtocolESP, layers.IPProtocolNoNextHeader:
 			fp.Protocol = uint8(proto)
@@ -366,7 +364,7 @@ func parseV6(data []byte, incoming bool, fp *firewall.Packet) error {
 
 		case layers.IPProtocolAH:
 			// Auth headers, used by IPSec, have a different meaning for header length
-			if dataLen < offset+1 {
+			if dataLen <= offset+1 {
 				break
 			}
 
@@ -374,7 +372,7 @@ func parseV6(data []byte, incoming bool, fp *firewall.Packet) error {
 
 		default:
 			// Normal ipv6 header length processing
-			if dataLen < offset+1 {
+			if dataLen <= offset+1 {
 				break
 			}
 

outside_test.go

@@ -117,6 +117,45 @@ func Test_newPacket_v6(t *testing.T) {
 	err = newPacket(buffer.Bytes(), true, p)
 	require.ErrorIs(t, err, ErrIPv6CouldNotFindPayload)
 
+	// A v6 packet with a hop-by-hop extension
+	// ICMPv6 Payload (Echo Request)
+	icmpLayer := layers.ICMPv6{
+		TypeCode: layers.ICMPv6TypeEchoRequest,
+	}
+	// Hop-by-Hop Extension Header
+	hopOption := layers.IPv6HopByHopOption{}
+	hopOption.OptionData = []byte{0, 0, 0, 0}
+	hopByHop := layers.IPv6HopByHop{}
+	hopByHop.Options = append(hopByHop.Options, &hopOption)
+
+	ip = layers.IPv6{
+		Version:    6,
+		HopLimit:   128,
+		NextHeader: layers.IPProtocolIPv6Destination,
+		SrcIP:      net.IPv6linklocalallrouters,
+		DstIP:      net.IPv6linklocalallnodes,
+	}
+
+	buffer.Clear()
+	err = gopacket.SerializeLayers(buffer, gopacket.SerializeOptions{
+		ComputeChecksums: false,
+		FixLengths:       true,
+	}, &ip, &hopByHop, &icmpLayer)
+	if err != nil {
+		panic(err)
+	}
+	// Ensure buffer length checks during parsing with the next 2 tests.
+
+	// A full IPv6 header and 1 byte in the first extension, but missing
+	// the length byte.
+	err = newPacket(buffer.Bytes()[:41], true, p)
+	require.ErrorIs(t, err, ErrIPv6CouldNotFindPayload)
+
+	// A full IPv6 header plus 1 full extension, but only 1 byte of the
+	// next layer, missing length byte
+	err = newPacket(buffer.Bytes()[:49], true, p)
+	require.ErrorIs(t, err, ErrIPv6CouldNotFindPayload)
+
 	// A good ICMP packet
 	ip = layers.IPv6{
 		Version:    6,
@@ -288,6 +327,10 @@ func Test_newPacket_v6(t *testing.T) {
 	assert.Equal(t, uint16(22), p.LocalPort)
 	assert.False(t, p.Fragment)
 
+	// Ensure buffer bounds checking during processing
+	err = newPacket(b[:41], true, p)
+	require.ErrorIs(t, err, ErrIPv6PacketTooShort)
+
 	// Invalid AH header
 	b = buffer.Bytes()
 	err = newPacket(b, true, p)

overlay/route.go

@@ -3,6 +3,7 @@ package overlay
 import (
 	"fmt"
 	"math"
+	"net"
 	"net/netip"
 	"runtime"
 	"strconv"
@@ -304,3 +305,29 @@ func parseUnsafeRoutes(c *config.C, networks []netip.Prefix) ([]Route, error) {
 
 	return routes, nil
 }
+
+func ipWithin(o *net.IPNet, i *net.IPNet) bool {
+	// Make sure o contains the lowest form of i
+	if !o.Contains(i.IP.Mask(i.Mask)) {
+		return false
+	}
+
+	// Find the max ip in i
+	ip4 := i.IP.To4()
+	if ip4 == nil {
+		return false
+	}
+
+	last := make(net.IP, len(ip4))
+	copy(last, ip4)
+	for x := range ip4 {
+		last[x] |= ^i.Mask[x]
+	}
+
+	// Make sure o contains the max
+	if !o.Contains(last) {
+		return false
+	}
+
+	return true
+}

overlay/route_test.go

@@ -225,7 +225,6 @@ func Test_parseUnsafeRoutes(t *testing.T) {
 	// no mtu
 	c.Settings["tun"] = map[string]any{"unsafe_routes": []any{map[string]any{"via": "127.0.0.1", "route": "1.0.0.0/8"}}}
 	routes, err = parseUnsafeRoutes(c, []netip.Prefix{n})
-	require.NoError(t, err)
 	assert.Len(t, routes, 1)
 	assert.Equal(t, 0, routes[0].MTU)
 
@@ -319,7 +318,7 @@ func Test_makeRouteTree(t *testing.T) {
 
 	ip, err = netip.ParseAddr("1.1.0.1")
 	require.NoError(t, err)
-	_, ok = routeTree.Lookup(ip)
+	r, ok = routeTree.Lookup(ip)
 	assert.False(t, ok)
 }
 

overlay/tun_linux.go

@@ -38,6 +38,7 @@ type tun struct {
 	routeTree                 atomic.Pointer[bart.Table[routing.Gateways]]
 	routeChan                 chan struct{}
 	useSystemRoutes           bool
+	useSystemRoutesBufferSize int
 
 	l *logrus.Logger
 }
@@ -129,6 +130,7 @@ func newTunGeneric(c *config.C, l *logrus.Logger, file *os.File, vpnNetworks []n
 		vpnNetworks:               vpnNetworks,
 		TXQueueLen:                c.GetInt("tun.tx_queue", 500),
 		useSystemRoutes:           c.GetBool("tun.use_system_route_table", false),
+		useSystemRoutesBufferSize: c.GetInt("tun.use_system_route_table_buffer_size", 0),
 		l:                         l,
 	}
 
@@ -531,7 +533,13 @@ func (t *tun) watchRoutes() {
 	rch := make(chan netlink.RouteUpdate)
 	doneChan := make(chan struct{})
 
-	if err := netlink.RouteSubscribe(rch, doneChan); err != nil {
+	netlinkOptions := netlink.RouteSubscribeOptions{
+		ReceiveBufferSize:      t.useSystemRoutesBufferSize,
+		ReceiveBufferForceSize: t.useSystemRoutesBufferSize != 0,
+		ErrorCallback:          func(e error) { t.l.WithError(e).Errorf("netlink error") },
+	}
+
+	if err := netlink.RouteSubscribeWithOptions(rch, doneChan, netlinkOptions); err != nil {
 		t.l.WithError(err).Errorf("failed to subscribe to system route changes")
 		return
 	}
@@ -541,8 +549,14 @@ func (t *tun) watchRoutes() {
 	go func() {
 		for {
 			select {
-			case r := <-rch:
+			case r, ok := <-rch:
+				if ok {
 					t.updateRoutes(r)
+				} else {
+					// may be should do something here as
+					// netlink stops sending updates
+					return
+				}
 			case <-doneChan:
 				// netlink.RouteSubscriber will close the rch for us
 				return

pkclient/pkclient.go

@@ -1,6 +1,8 @@
 package pkclient
 
 import (
+	"crypto/ecdsa"
+	"crypto/x509"
 	"fmt"
 	"io"
 	"strconv"
@@ -48,6 +50,27 @@ func FromUrl(pkurl string) (*PKClient, error) {
 	return New(module, uint(slotid), pin, id, label)
 }
 
+func ecKeyToArray(key *ecdsa.PublicKey) []byte {
+	x := make([]byte, 32)
+	y := make([]byte, 32)
+	key.X.FillBytes(x)
+	key.Y.FillBytes(y)
+	return append([]byte{0x04}, append(x, y...)...)
+}
+
+func formatPubkeyFromPublicKeyInfoAttr(d []byte) ([]byte, error) {
+	e, err := x509.ParsePKIXPublicKey(d)
+	if err != nil {
+		return nil, err
+	}
+	switch t := e.(type) {
+	case *ecdsa.PublicKey:
+		return ecKeyToArray(e.(*ecdsa.PublicKey)), nil
+	default:
+		return nil, fmt.Errorf("unknown public key type: %T", t)
+	}
+}
+
 func (c *PKClient) Test() error {
 	pub, err := c.GetPubKey()
 	if err != nil {

pkclient/pkclient_cgo.go

@@ -3,8 +3,6 @@
 package pkclient
 
 import (
-	"crypto/ecdsa"
-	"crypto/x509"
 	"encoding/asn1"
 	"errors"
 	"fmt"
@@ -229,24 +227,3 @@ func (c *PKClient) GetPubKey() ([]byte, error) {
 		return nil, fmt.Errorf("unknown public key length: %d", len(d))
 	}
 }
-
-func ecKeyToArray(key *ecdsa.PublicKey) []byte {
-	x := make([]byte, 32)
-	y := make([]byte, 32)
-	key.X.FillBytes(x)
-	key.Y.FillBytes(y)
-	return append([]byte{0x04}, append(x, y...)...)
-}
-
-func formatPubkeyFromPublicKeyInfoAttr(d []byte) ([]byte, error) {
-	e, err := x509.ParsePKIXPublicKey(d)
-	if err != nil {
-		return nil, err
-	}
-	switch t := e.(type) {
-	case *ecdsa.PublicKey:
-		return ecKeyToArray(e.(*ecdsa.PublicKey)), nil
-	default:
-		return nil, fmt.Errorf("unknown public key type: %T", t)
-	}
-}

pkclient/pkclient_stub.go

@@ -7,10 +7,10 @@ import "errors"
 type PKClient struct {
 }
 
-var errNotImplemented = errors.New("not implemented")
+var notImplemented = errors.New("not implemented")
 
 func New(hsmPath string, slotId uint, pin string, id string, label string) (*PKClient, error) {
-	return nil, errNotImplemented
+	return nil, notImplemented
 }
 
 func (c *PKClient) Close() error {
@@ -18,13 +18,13 @@ func (c *PKClient) Close() error {
 }
 
 func (c *PKClient) SignASN1(data []byte) ([]byte, error) {
-	return nil, errNotImplemented
+	return nil, notImplemented
 }
 
 func (c *PKClient) DeriveNoise(_ []byte) ([]byte, error) {
-	return nil, errNotImplemented
+	return nil, notImplemented
 }
 
 func (c *PKClient) GetPubKey() ([]byte, error) {
-	return nil, errNotImplemented
+	return nil, notImplemented
 }

pki.go

@@ -39,10 +39,10 @@ type CertState struct {
 	cipher            string
 
 	myVpnNetworks            []netip.Prefix
-	myVpnNetworksTable       *bart.Table[struct{}]
+	myVpnNetworksTable       *bart.Lite
 	myVpnAddrs               []netip.Addr
-	myVpnAddrsTable          *bart.Table[struct{}]
-	myVpnBroadcastAddrsTable *bart.Table[struct{}]
+	myVpnAddrsTable          *bart.Lite
+	myVpnBroadcastAddrsTable *bart.Lite
 }
 
 func NewPKIFromConfig(l *logrus.Logger, c *config.C) (*PKI, error) {
@@ -345,9 +345,9 @@ func newCertState(dv cert.Version, v1, v2 cert.Certificate, pkcs11backed bool, p
 	cs := CertState{
 		privateKey:               privateKey,
 		pkcs11Backed:             pkcs11backed,
-		myVpnNetworksTable:       new(bart.Table[struct{}]),
-		myVpnAddrsTable:          new(bart.Table[struct{}]),
-		myVpnBroadcastAddrsTable: new(bart.Table[struct{}]),
+		myVpnNetworksTable:       new(bart.Lite),
+		myVpnAddrsTable:          new(bart.Lite),
+		myVpnBroadcastAddrsTable: new(bart.Lite),
 	}
 
 	if v1 != nil && v2 != nil {
@@ -415,16 +415,16 @@ func newCertState(dv cert.Version, v1, v2 cert.Certificate, pkcs11backed bool, p
 
 	for _, network := range crt.Networks() {
 		cs.myVpnNetworks = append(cs.myVpnNetworks, network)
-		cs.myVpnNetworksTable.Insert(network, struct{}{})
+		cs.myVpnNetworksTable.Insert(network)
 
 		cs.myVpnAddrs = append(cs.myVpnAddrs, network.Addr())
-		cs.myVpnAddrsTable.Insert(netip.PrefixFrom(network.Addr(), network.Addr().BitLen()), struct{}{})
+		cs.myVpnAddrsTable.Insert(netip.PrefixFrom(network.Addr(), network.Addr().BitLen()))
 
 		if network.Addr().Is4() {
 			addr := network.Masked().Addr().As4()
 			mask := net.CIDRMask(network.Bits(), network.Addr().BitLen())
 			binary.BigEndian.PutUint32(addr[:], binary.BigEndian.Uint32(addr[:])|^binary.BigEndian.Uint32(mask))
-			cs.myVpnBroadcastAddrsTable.Insert(netip.PrefixFrom(netip.AddrFrom4(addr), network.Addr().BitLen()), struct{}{})
+			cs.myVpnBroadcastAddrsTable.Insert(netip.PrefixFrom(netip.AddrFrom4(addr), network.Addr().BitLen()))
 		}
 	}
 

relay_manager.go

@@ -241,15 +241,13 @@ func (rm *relayManager) handleCreateRelayRequest(v cert.Version, h *HostInfo, f
 	logMsg.Info("handleCreateRelayRequest")
 	// Is the source of the relay me? This should never happen, but did happen due to
 	// an issue migrating relays over to newly re-handshaked host info objects.
-	_, found := f.myVpnAddrsTable.Lookup(from)
-	if found {
+	if f.myVpnAddrsTable.Contains(from) {
 		logMsg.WithField("myIP", from).Error("Discarding relay request from myself")
 		return
 	}
 
 	// Is the target of the relay me?
-	_, found = f.myVpnAddrsTable.Lookup(target)
-	if found {
+	if f.myVpnAddrsTable.Contains(target) {
 		existingRelay, ok := h.relayState.QueryRelayForByIp(from)
 		if ok {
 			switch existingRelay.State {

remote_list.go

@@ -7,11 +7,11 @@ import (
 	"slices"
 	"sort"
 	"strconv"
-	"sync"
 	"sync/atomic"
 	"time"
 
 	"github.com/sirupsen/logrus"
+	"github.com/wadey/synctrace"
 )
 
 // forEachFunc is used to benefit folks that want to do work inside the lock
@@ -185,7 +185,7 @@ func (hr *hostnamesResults) GetAddrs() []netip.AddrPort {
 // It serves as a local cache of query replies, host update notifications, and locally learned addresses
 type RemoteList struct {
 	// Every interaction with internals requires a lock!
-	sync.RWMutex
+	synctrace.RWMutex
 
 	// The full list of vpn addresses assigned to this host
 	vpnAddrs []netip.Addr
@@ -215,6 +215,7 @@ type RemoteList struct {
 // NewRemoteList creates a new empty RemoteList
 func NewRemoteList(vpnAddrs []netip.Addr, shouldAdd func(netip.Addr) bool) *RemoteList {
 	r := &RemoteList{
+		RWMutex:   synctrace.NewRWMutex("remote-list"),
 		vpnAddrs:  make([]netip.Addr, len(vpnAddrs)),
 		addrs:     make([]netip.AddrPort, 0),
 		relays:    make([]netip.Addr, 0),
@@ -263,7 +264,9 @@ func (r *RemoteList) CopyAddrs(preferredRanges []netip.Prefix) []netip.AddrPort
 	r.RLock()
 	defer r.RUnlock()
 	c := make([]netip.AddrPort, len(r.addrs))
-	copy(c, r.addrs)
+	for i, v := range r.addrs {
+		c[i] = v
+	}
 	return c
 }
 
@@ -324,7 +327,9 @@ func (r *RemoteList) CopyCache() *CacheMap {
 		}
 
 		if mc.relay != nil {
-			c.Relay = append(c.Relay, mc.relay.relay...)
+			for _, a := range mc.relay.relay {
+				c.Relay = append(c.Relay, a)
+			}
 		}
 	}
 
@@ -358,7 +363,9 @@ func (r *RemoteList) CopyBlockedRemotes() []netip.AddrPort {
 	defer r.RUnlock()
 
 	c := make([]netip.AddrPort, len(r.badRemotes))
-	copy(c, r.badRemotes)
+	for i, v := range r.badRemotes {
+		c[i] = v
+	}
 	return c
 }
 
@@ -563,7 +570,9 @@ func (r *RemoteList) unlockedCollect() {
 		}
 
 		if c.relay != nil {
-			relays = append(relays, c.relay.relay...)
+			for _, v := range c.relay.relay {
+				relays = append(relays, v)
+			}
 		}
 	}
 
@@ -627,15 +636,15 @@ func (r *RemoteList) unlockedSort(preferredRanges []netip.Prefix) {
 		a4 := a.Addr().Is4()
 		b4 := b.Addr().Is4()
 		switch {
-		case !a4 && b4:
+		case a4 == false && b4 == true:
 			// If i is v6 and j is v4, i is less than j
 			return true
 
-		case a4 && !b4:
+		case a4 == true && b4 == false:
 			// If j is v6 and i is v4, i is not less than j
 			return false
 
-		case a4 && b4:
+		case a4 == true && b4 == true:
 			// i and j are both ipv4
 			aPrivate := a.Addr().IsPrivate()
 			bPrivate := b.Addr().IsPrivate()
@@ -683,6 +692,7 @@ func (r *RemoteList) unlockedSort(preferredRanges []netip.Prefix) {
 	}
 
 	r.addrs = r.addrs[:a+1]
+	return
 }
 
 // minInt returns the minimum integer of a or b

service/service.go

@@ -9,13 +9,10 @@ import (
 	"math"
 	"net"
 	"net/netip"
-	"os"
 	"strings"
 	"sync"
 
-	"github.com/sirupsen/logrus"
 	"github.com/slackhq/nebula"
-	"github.com/slackhq/nebula/config"
 	"github.com/slackhq/nebula/overlay"
 	"golang.org/x/sync/errgroup"
 	"gvisor.dev/gvisor/pkg/buffer"
@@ -46,14 +43,7 @@ type Service struct {
 	}
 }
 
-func New(config *config.C) (*Service, error) {
-	logger := logrus.New()
-	logger.Out = os.Stdout
-
-	control, err := nebula.Main(config, false, "custom-app", logger, overlay.NewUserDeviceFromConfig)
-	if err != nil {
-		return nil, err
-	}
+func New(control *nebula.Control) (*Service, error) {
 	control.Start()
 
 	ctx := control.Context()

service/service_test.go

@@ -5,13 +5,17 @@ import (
 	"context"
 	"errors"
 	"net/netip"
+	"os"
 	"testing"
 	"time"
 
 	"dario.cat/mergo"
+	"github.com/sirupsen/logrus"
+	"github.com/slackhq/nebula"
 	"github.com/slackhq/nebula/cert"
 	"github.com/slackhq/nebula/cert_test"
 	"github.com/slackhq/nebula/config"
+	"github.com/slackhq/nebula/overlay"
 	"golang.org/x/sync/errgroup"
 	"gopkg.in/yaml.v3"
 )
@@ -71,7 +75,15 @@ func newSimpleService(caCrt cert.Certificate, caKey []byte, name string, udpIp n
 		panic(err)
 	}
 
-	s, err := New(&c)
+	logger := logrus.New()
+	logger.Out = os.Stdout
+
+	control, err := nebula.Main(&c, false, "custom-app", logger, overlay.NewUserDeviceFromConfig)
+	if err != nil {
+		panic(err)
+	}
+
+	s, err := New(control)
 	if err != nil {
 		panic(err)
 	}

ssh.go

@@ -527,11 +527,11 @@ func sshStartCpuProfile(fs any, a []string, w sshd.StringWriter) error {
 	return err
 }
 
-func sshVersion(ifce *Interface, _ any, _ []string, w sshd.StringWriter) error {
-	return w.WriteLine(ifce.version)
+func sshVersion(ifce *Interface, fs any, a []string, w sshd.StringWriter) error {
+	return w.WriteLine(fmt.Sprintf("%s", ifce.version))
 }
 
-func sshQueryLighthouse(ifce *Interface, _ any, a []string, w sshd.StringWriter) error {
+func sshQueryLighthouse(ifce *Interface, fs any, a []string, w sshd.StringWriter) error {
 	if len(a) == 0 {
 		return w.WriteLine("No vpn address was provided")
 	}
@@ -584,7 +584,7 @@ func sshCloseTunnel(ifce *Interface, fs any, a []string, w sshd.StringWriter) er
 			hostInfo.ConnectionState,
 			hostInfo,
 			[]byte{},
-			make([]byte, 12),
+			make([]byte, 12, 12),
 			make([]byte, mtu),
 		)
 	}
@@ -614,12 +614,12 @@ func sshCreateTunnel(ifce *Interface, fs any, a []string, w sshd.StringWriter) e
 
 	hostInfo := ifce.hostMap.QueryVpnAddr(vpnAddr)
 	if hostInfo != nil {
-		return w.WriteLine("Tunnel already exists")
+		return w.WriteLine(fmt.Sprintf("Tunnel already exists"))
 	}
 
 	hostInfo = ifce.handshakeManager.QueryVpnAddr(vpnAddr)
 	if hostInfo != nil {
-		return w.WriteLine("Tunnel already handshaking")
+		return w.WriteLine(fmt.Sprintf("Tunnel already handshaking"))
 	}
 
 	var addr netip.AddrPort
@@ -735,7 +735,7 @@ func sshGetMutexProfile(fs any, a []string, w sshd.StringWriter) error {
 	return w.WriteLine(fmt.Sprintf("Mutex profile created at %s", a))
 }
 
-func sshLogLevel(l *logrus.Logger, _ any, a []string, w sshd.StringWriter) error {
+func sshLogLevel(l *logrus.Logger, fs any, a []string, w sshd.StringWriter) error {
 	if len(a) == 0 {
 		return w.WriteLine(fmt.Sprintf("Log level is: %s", l.Level))
 	}
@@ -749,7 +749,7 @@ func sshLogLevel(l *logrus.Logger, _ any, a []string, w sshd.StringWriter) error
 	return w.WriteLine(fmt.Sprintf("Log level is: %s", l.Level))
 }
 
-func sshLogFormat(l *logrus.Logger, _ any, a []string, w sshd.StringWriter) error {
+func sshLogFormat(l *logrus.Logger, fs any, a []string, w sshd.StringWriter) error {
 	if len(a) == 0 {
 		return w.WriteLine(fmt.Sprintf("Log format is: %s", reflect.TypeOf(l.Formatter)))
 	}
@@ -822,10 +822,10 @@ func sshPrintCert(ifce *Interface, fs any, a []string, w sshd.StringWriter) erro
 	return w.WriteLine(cert.String())
 }
 
-func sshPrintRelays(ifce *Interface, fs any, _ []string, w sshd.StringWriter) error {
+func sshPrintRelays(ifce *Interface, fs any, a []string, w sshd.StringWriter) error {
 	args, ok := fs.(*sshPrintTunnelFlags)
 	if !ok {
-		w.WriteLine("sshPrintRelays failed to convert args type")
+		w.WriteLine(fmt.Sprintf("sshPrintRelays failed to convert args type"))
 		return nil
 	}
 

sshd/server.go

@@ -5,10 +5,10 @@ import (
 	"errors"
 	"fmt"
 	"net"
-	"sync"
 
 	"github.com/armon/go-radix"
 	"github.com/sirupsen/logrus"
+	"github.com/wadey/synctrace"
 	"golang.org/x/crypto/ssh"
 )
 
@@ -23,11 +23,12 @@ type SSHServer struct {
 	trustedCAs  []ssh.PublicKey
 
 	// List of available commands
+	helpCommand *Command
 	commands    *radix.Tree
 	listener    net.Listener
 
 	// Locks the conns/counter to avoid concurrent map access
-	connsLock sync.Mutex
+	connsLock synctrace.Mutex
 	conns     map[int]*session
 	counter   int
 }
@@ -40,9 +41,10 @@ func NewSSHServer(l *logrus.Entry) (*SSHServer, error) {
 		l:           l,
 		commands:    radix.New(),
 		conns:       make(map[int]*session),
+		connsLock:   synctrace.NewMutex("ssh-server-conns"),
 	}
 
-	cc := &ssh.CertChecker{
+	cc := ssh.CertChecker{
 		IsUserAuthority: func(auth ssh.PublicKey) bool {
 			for _, ca := range s.trustedCAs {
 				if bytes.Equal(ca.Marshal(), auth.Marshal()) {
@@ -76,11 +78,10 @@ func NewSSHServer(l *logrus.Entry) (*SSHServer, error) {
 
 		},
 	}
-	s.certChecker = cc
 
 	s.config = &ssh.ServerConfig{
 		PublicKeyCallback: cc.Authenticate,
-		ServerVersion:     "SSH-2.0-Nebula???",
+		ServerVersion:     fmt.Sprintf("SSH-2.0-Nebula???"),
 	}
 
 	s.RegisterCommand(&Command{

sshd/session.go

@@ -170,6 +170,7 @@ func (s *session) dispatchCommand(line string, w StringWriter) {
 	}
 
 	_ = execCommand(c, args[1:], w)
+	return
 }
 
 func (s *session) Close() {

timeout.go

@@ -1,8 +1,9 @@
 package nebula
 
 import (
-	"sync"
 	"time"
+
+	"github.com/wadey/synctrace"
 )
 
 // How many timer objects should be cached
@@ -34,7 +35,7 @@ type TimerWheel[T any] struct {
 }
 
 type LockingTimerWheel[T any] struct {
-	m sync.Mutex
+	m synctrace.Mutex
 	t *TimerWheel[T]
 }
 
@@ -81,8 +82,9 @@ func NewTimerWheel[T any](min, max time.Duration) *TimerWheel[T] {
 }
 
 // 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] {
+func NewLockingTimerWheel[T any](name string, min, max time.Duration) *LockingTimerWheel[T] {
 	return &LockingTimerWheel[T]{
+		m: synctrace.NewMutex(name),
 		t: NewTimerWheel[T](min, max),
 	}
 }

udp/conn.go

@@ -30,11 +30,15 @@ func (NoopConn) Rebind() error {
 func (NoopConn) LocalAddr() (netip.AddrPort, error) {
 	return netip.AddrPort{}, nil
 }
-func (NoopConn) ListenOut(_ EncReader) {}
+func (NoopConn) ListenOut(_ EncReader) {
+	return
+}
 func (NoopConn) WriteTo(_ []byte, _ netip.AddrPort) error {
 	return nil
 }
-func (NoopConn) ReloadConfig(_ *config.C) {}
+func (NoopConn) ReloadConfig(_ *config.C) {
+	return
+}
 func (NoopConn) Close() error {
 	return nil
 }

udp/udp_generic.go

@@ -33,7 +33,7 @@ func NewGenericListener(l *logrus.Logger, ip netip.Addr, port int, multi bool, b
 	if uc, ok := pc.(*net.UDPConn); ok {
 		return &GenericConn{UDPConn: uc, l: l}, nil
 	}
-	return nil, fmt.Errorf("unexpected PacketConn: %T %#v", pc, pc)
+	return nil, fmt.Errorf("Unexpected PacketConn: %T %#v", pc, pc)
 }
 
 func (u *GenericConn) WriteTo(b []byte, addr netip.AddrPort) error {
@@ -66,6 +66,10 @@ func NewUDPStatsEmitter(udpConns []Conn) func() {
 	return func() {}
 }
 
+type rawMessage struct {
+	Len uint32
+}
+
 func (u *GenericConn) ListenOut(r EncReader) {
 	buffer := make([]byte, MTU)
 

udp/udp_rio_windows.go

@@ -11,13 +11,13 @@ import (
 	"io"
 	"net"
 	"net/netip"
-	"sync"
 	"sync/atomic"
 	"syscall"
 	"unsafe"
 
 	"github.com/sirupsen/logrus"
 	"github.com/slackhq/nebula/config"
+	"github.com/wadey/synctrace"
 	"golang.org/x/sys/windows"
 	"golang.zx2c4.com/wireguard/conn/winrio"
 )
@@ -46,7 +46,7 @@ type ringBuffer struct {
 	iocp       windows.Handle
 	isFull     bool
 	cq         winrio.Cq
-	mu         sync.Mutex
+	mu         synctrace.Mutex
 	overlapped windows.Overlapped
 }
 
@@ -64,7 +64,11 @@ func NewRIOListener(l *logrus.Logger, addr netip.Addr, port int) (*RIOConn, erro
 		return nil, errors.New("could not initialize winrio")
 	}
 
-	u := &RIOConn{l: l}
+	u := &RIOConn{
+		l:  l,
+		rx: ringBuffer{mu: synctrace.NewMutex("rio-rx")},
+		tx: ringBuffer{mu: synctrace.NewMutex("rio-tx")},
+	}
 
 	err := u.bind(&windows.SockaddrInet6{Addr: addr.As16(), Port: port})
 	if err != nil {