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Revert "Rollback new routing functionality (#1805)" (#1813)

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This reverts commit 9f32ccd453.
This commit is contained in:
Maycon Santos 2024-04-09 01:56:52 +09:00 committed by GitHub
parent 9f32ccd453
commit 3875c29f6b
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
49 changed files with 2982 additions and 367 deletions
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3
.github/workflows/golang-test-darwin.yml vendored
View File

@ -32,6 +32,9 @@ jobs:
restore-keys: |
macos-go-
- name: Install libpcap
run: brew install libpcap
- name: Install modules
run: go mod tidy

10
.github/workflows/golang-test-linux.yml vendored
View File

@ -36,7 +36,11 @@ jobs:
uses: actions/checkout@v3
- name: Install dependencies
run: sudo apt update && sudo apt install -y -q libgtk-3-dev libayatana-appindicator3-dev libgl1-mesa-dev xorg-dev gcc-multilib
run: sudo apt update && sudo apt install -y -q libgtk-3-dev libayatana-appindicator3-dev libgl1-mesa-dev xorg-dev gcc-multilib libpcap-dev
- name: Install 32-bit libpcap
if: matrix.arch == '386'
run: sudo dpkg --add-architecture i386 && sudo apt update && sudo apt-get install -y libpcap0.8-dev:i386
- name: Install modules
run: go mod tidy
@ -67,7 +71,7 @@ jobs:
uses: actions/checkout@v3
- name: Install dependencies
run: sudo apt update && sudo apt install -y -q libgtk-3-dev libayatana-appindicator3-dev libgl1-mesa-dev xorg-dev gcc-multilib
run: sudo apt update && sudo apt install -y -q libgtk-3-dev libayatana-appindicator3-dev libgl1-mesa-dev xorg-dev gcc-multilib libpcap-dev
- name: Install modules
run: go mod tidy
@ -82,7 +86,7 @@ jobs:
run: CGO_ENABLED=0 go test -c -o sharedsock-testing.bin ./sharedsock
- name: Generate RouteManager Test bin
run: CGO_ENABLED=0 go test -c -o routemanager-testing.bin ./client/internal/routemanager/...
run: CGO_ENABLED=1 go test -c -o routemanager-testing.bin -tags netgo -ldflags '-w -extldflags "-static -ldbus-1 -lpcap"' ./client/internal/routemanager/...
- name: Generate nftables Manager Test bin
run: CGO_ENABLED=0 go test -c -o nftablesmanager-testing.bin ./client/firewall/nftables/...

2
.github/workflows/golang-test-windows.yml vendored
View File

@ -46,7 +46,7 @@ jobs:
- run: PsExec64 -s -w ${{ github.workspace }} C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe env -w GOCACHE=C:\Users\runneradmin\AppData\Local\go-build
- name: test
run: PsExec64 -s -w ${{ github.workspace }} cmd.exe /c "C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe test -timeout 5m -p 1 ./... > test-out.txt 2>&1"
run: PsExec64 -s -w ${{ github.workspace }} cmd.exe /c "C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe test -timeout 10m -p 1 ./... > test-out.txt 2>&1"
- name: test output
if: ${{ always() }}
run: Get-Content test-out.txt

2
.github/workflows/golangci-lint.yml vendored
View File

@ -40,7 +40,7 @@ jobs:
cache: false
- name: Install dependencies
if: matrix.os == 'ubuntu-latest'
run: sudo apt update && sudo apt install -y -q libgtk-3-dev libayatana-appindicator3-dev libgl1-mesa-dev xorg-dev
run: sudo apt update && sudo apt install -y -q libgtk-3-dev libayatana-appindicator3-dev libgl1-mesa-dev xorg-dev libpcap-dev
- name: golangci-lint
uses: golangci/golangci-lint-action@v3
with:

16
client/internal/engine.go
View File

@ -94,6 +94,9 @@ type Engine struct {
// peerConns is a map that holds all the peers that are known to this peer
peerConns map[string]*peer.Conn
beforePeerHook peer.BeforeAddPeerHookFunc
afterPeerHook peer.AfterRemovePeerHookFunc
// rpManager is a Rosenpass manager
rpManager *rosenpass.Manager
@ -261,6 +264,14 @@ func (e *Engine) Start() error {
e.dnsServer = dnsServer
e.routeManager = routemanager.NewManager(e.ctx, e.config.WgPrivateKey.PublicKey().String(), e.wgInterface, e.statusRecorder, initialRoutes)
beforePeerHook, afterPeerHook, err := e.routeManager.Init()
if err != nil {
log.Errorf("Failed to initialize route manager: %s", err)
} else {
e.beforePeerHook = beforePeerHook
e.afterPeerHook = afterPeerHook
}
e.routeManager.SetRouteChangeListener(e.mobileDep.NetworkChangeListener)
err = e.wgInterfaceCreate()
@ -810,6 +821,11 @@ func (e *Engine) addNewPeer(peerConfig *mgmProto.RemotePeerConfig) error {
}
e.peerConns[peerKey] = conn
if e.beforePeerHook != nil && e.afterPeerHook != nil {
conn.AddBeforeAddPeerHook(e.beforePeerHook)
conn.AddAfterRemovePeerHook(e.afterPeerHook)
}
err = e.statusRecorder.AddPeer(peerKey, peerConfig.Fqdn)
if err != nil {
log.Warnf("error adding peer %s to status recorder, got error: %v", peerKey, err)

32
client/internal/peer/conn.go
View File

@ -20,6 +20,7 @@ import (
"github.com/netbirdio/netbird/iface/bind"
signal "github.com/netbirdio/netbird/signal/client"
sProto "github.com/netbirdio/netbird/signal/proto"
nbnet "github.com/netbirdio/netbird/util/net"
"github.com/netbirdio/netbird/version"
)
@ -100,6 +101,9 @@ type IceCredentials struct {
Pwd string
}
type BeforeAddPeerHookFunc func(connID nbnet.ConnectionID, IP net.IP) error
type AfterRemovePeerHookFunc func(connID nbnet.ConnectionID) error
type Conn struct {
config ConnConfig
mu sync.Mutex
@ -138,6 +142,10 @@ type Conn struct {
remoteEndpoint *net.UDPAddr
remoteConn *ice.Conn
connID nbnet.ConnectionID
beforeAddPeerHooks []BeforeAddPeerHookFunc
afterRemovePeerHooks []AfterRemovePeerHookFunc
}
// meta holds meta information about a connection
@ -393,6 +401,14 @@ func isRelayCandidate(candidate ice.Candidate) bool {
return candidate.Type() == ice.CandidateTypeRelay
}
func (conn *Conn) AddBeforeAddPeerHook(hook BeforeAddPeerHookFunc) {
conn.beforeAddPeerHooks = append(conn.beforeAddPeerHooks, hook)
}
func (conn *Conn) AddAfterRemovePeerHook(hook AfterRemovePeerHookFunc) {
conn.afterRemovePeerHooks = append(conn.afterRemovePeerHooks, hook)
}
// configureConnection starts proxying traffic from/to local Wireguard and sets connection status to StatusConnected
func (conn *Conn) configureConnection(remoteConn net.Conn, remoteWgPort int, remoteRosenpassPubKey []byte, remoteRosenpassAddr string) (net.Addr, error) {
conn.mu.Lock()
@ -421,6 +437,13 @@ func (conn *Conn) configureConnection(remoteConn net.Conn, remoteWgPort int, rem
conn.remoteEndpoint = endpointUdpAddr
log.Debugf("Conn resolved IP for %s: %s", endpoint, endpointUdpAddr.IP)
conn.connID = nbnet.GenerateConnID()
for _, hook := range conn.beforeAddPeerHooks {
if err := hook(conn.connID, endpointUdpAddr.IP); err != nil {
log.Errorf("Before add peer hook failed: %v", err)
}
}
err = conn.config.WgConfig.WgInterface.UpdatePeer(conn.config.WgConfig.RemoteKey, conn.config.WgConfig.AllowedIps, defaultWgKeepAlive, endpointUdpAddr, conn.config.WgConfig.PreSharedKey)
if err != nil {
if conn.wgProxy != nil {
@ -511,6 +534,15 @@ func (conn *Conn) cleanup() error {
// todo: is it problem if we try to remove a peer what is never existed?
err3 = conn.config.WgConfig.WgInterface.RemovePeer(conn.config.WgConfig.RemoteKey)
if conn.connID != "" {
for _, hook := range conn.afterRemovePeerHooks {
if err := hook(conn.connID); err != nil {
log.Errorf("After remove peer hook failed: %v", err)
}
}
}
conn.connID = ""
if conn.notifyDisconnected != nil {
conn.notifyDisconnected()
conn.notifyDisconnected = nil

7
client/internal/relay/relay.go
View File

@ -12,6 +12,7 @@ import (
log "github.com/sirupsen/logrus"
"github.com/netbirdio/netbird/client/internal/stdnet"
nbnet "github.com/netbirdio/netbird/util/net"
)
// ProbeResult holds the info about the result of a relay probe request
@ -95,15 +96,13 @@ func ProbeTURN(ctx context.Context, uri *stun.URI) (addr string, probeErr error)
switch uri.Proto {
case stun.ProtoTypeUDP:
var err error
listener := &net.ListenConfig{}
conn, err = listener.ListenPacket(ctx, "udp", "")
conn, err = nbnet.NewListener().ListenPacket(ctx, "udp", "")
if err != nil {
probeErr = fmt.Errorf("listen: %w", err)
return
}
case stun.ProtoTypeTCP:
dialer := &net.Dialer{}
tcpConn, err := dialer.DialContext(ctx, "tcp", turnServerAddr)
tcpConn, err := nbnet.NewDialer().DialContext(ctx, "tcp", turnServerAddr)
if err != nil {
probeErr = fmt.Errorf("dial: %w", err)
return

63
client/internal/routemanager/client.go
View File

@ -41,6 +41,7 @@ type clientNetwork struct {
func newClientNetworkWatcher(ctx context.Context, wgInterface *iface.WGIface, statusRecorder *peer.Status, network netip.Prefix) *clientNetwork {
ctx, cancel := context.WithCancel(ctx)
client := &clientNetwork{
ctx: ctx,
stop: cancel,
@ -72,6 +73,18 @@ func (c *clientNetwork) getRouterPeerStatuses() map[string]routerPeerStatus {
return routePeerStatuses
}
// getBestRouteFromStatuses determines the most optimal route from the available routes
// within a clientNetwork, taking into account peer connection status, route metrics, and
// preference for non-relayed and direct connections.
//
// It follows these prioritization rules:
// * Connected peers: Only routes with connected peers are considered.
// * Metric: Routes with lower metrics (better) are prioritized.
// * Non-relayed: Routes without relays are preferred.
// * Direct connections: Routes with direct peer connections are favored.
// * Stability: In case of equal scores, the currently active route (if any) is maintained.
//
// It returns the ID of the selected optimal route.
func (c *clientNetwork) getBestRouteFromStatuses(routePeerStatuses map[string]routerPeerStatus) string {
chosen := ""
chosenScore := 0
@ -158,7 +171,7 @@ func (c *clientNetwork) startPeersStatusChangeWatcher() {
func (c *clientNetwork) removeRouteFromWireguardPeer(peerKey string) error {
state, err := c.statusRecorder.GetPeer(peerKey)
if err != nil {
return err
return fmt.Errorf("get peer state: %v", err)
}
delete(state.Routes, c.network.String())
@ -172,7 +185,7 @@ func (c *clientNetwork) removeRouteFromWireguardPeer(peerKey string) error {
err = c.wgInterface.RemoveAllowedIP(peerKey, c.network.String())
if err != nil {
return fmt.Errorf("couldn't remove allowed IP %s removed for peer %s, err: %v",
return fmt.Errorf("remove allowed IP %s removed for peer %s, err: %v",
c.network, c.chosenRoute.Peer, err)
}
return nil
@ -180,30 +193,26 @@ func (c *clientNetwork) removeRouteFromWireguardPeer(peerKey string) error {
func (c *clientNetwork) removeRouteFromPeerAndSystem() error {
if c.chosenRoute != nil {
err := c.removeRouteFromWireguardPeer(c.chosenRoute.Peer)
if err != nil {
return err
if err := removeVPNRoute(c.network, c.wgInterface.Name()); err != nil {
return fmt.Errorf("remove route %s from system, err: %v", c.network, err)
}
err = removeFromRouteTableIfNonSystem(c.network, c.wgInterface.Address().IP.String())
if err != nil {
return fmt.Errorf("couldn't remove route %s from system, err: %v",
c.network, err)
if err := c.removeRouteFromWireguardPeer(c.chosenRoute.Peer); err != nil {
return fmt.Errorf("remove route: %v", err)
}
}
return nil
}
func (c *clientNetwork) recalculateRouteAndUpdatePeerAndSystem() error {
var err error
routerPeerStatuses := c.getRouterPeerStatuses()
chosen := c.getBestRouteFromStatuses(routerPeerStatuses)
// If no route is chosen, remove the route from the peer and system
if chosen == "" {
err = c.removeRouteFromPeerAndSystem()
if err != nil {
return err
if err := c.removeRouteFromPeerAndSystem(); err != nil {
return fmt.Errorf("remove route from peer and system: %v", err)
}
c.chosenRoute = nil
@ -211,6 +220,7 @@ func (c *clientNetwork) recalculateRouteAndUpdatePeerAndSystem() error {
return nil
}
// If the chosen route is the same as the current route, do nothing
if c.chosenRoute != nil && c.chosenRoute.ID == chosen {
if c.chosenRoute.IsEqual(c.routes[chosen]) {
return nil
@ -218,13 +228,13 @@ func (c *clientNetwork) recalculateRouteAndUpdatePeerAndSystem() error {
}
if c.chosenRoute != nil {
err = c.removeRouteFromWireguardPeer(c.chosenRoute.Peer)
if err != nil {
return err
// If a previous route exists, remove it from the peer
if err := c.removeRouteFromWireguardPeer(c.chosenRoute.Peer); err != nil {
return fmt.Errorf("remove route from peer: %v", err)
}
} else {
err = addToRouteTableIfNoExists(c.network, c.wgInterface.Address().IP.String())
if err != nil {
// otherwise add the route to the system
if err := addVPNRoute(c.network, c.wgInterface.Name()); err != nil {
return fmt.Errorf("route %s couldn't be added for peer %s, err: %v",
c.network.String(), c.wgInterface.Address().IP.String(), err)
}
@ -245,8 +255,7 @@ func (c *clientNetwork) recalculateRouteAndUpdatePeerAndSystem() error {
}
}
err = c.wgInterface.AddAllowedIP(c.chosenRoute.Peer, c.network.String())
if err != nil {
if err := c.wgInterface.AddAllowedIP(c.chosenRoute.Peer, c.network.String()); err != nil {
log.Errorf("couldn't add allowed IP %s added for peer %s, err: %v",
c.network, c.chosenRoute.Peer, err)
}
@ -287,21 +296,21 @@ func (c *clientNetwork) peersStateAndUpdateWatcher() {
log.Debugf("stopping watcher for network %s", c.network)
err := c.removeRouteFromPeerAndSystem()
if err != nil {
log.Error(err)
log.Errorf("Couldn't remove route from peer and system for network %s: %v", c.network, err)
}
return
case <-c.peerStateUpdate:
err := c.recalculateRouteAndUpdatePeerAndSystem()
if err != nil {
log.Error(err)
log.Errorf("Couldn't recalculate route and update peer and system: %v", err)
}
case update := <-c.routeUpdate:
if update.updateSerial < c.updateSerial {
log.Warnf("received a routes update with smaller serial number, ignoring it")
log.Warnf("Received a routes update with smaller serial number, ignoring it")
continue
}
log.Debugf("received a new client network route update for %s", c.network)
log.Debugf("Received a new client network route update for %s", c.network)
c.handleUpdate(update)
@ -309,7 +318,7 @@ func (c *clientNetwork) peersStateAndUpdateWatcher() {
err := c.recalculateRouteAndUpdatePeerAndSystem()
if err != nil {
log.Error(err)
log.Errorf("Couldn't recalculate route and update peer and system for network %s: %v", c.network, err)
}
c.startPeersStatusChangeWatcher()

79
client/internal/routemanager/manager.go
View File

@ -2,6 +2,10 @@ package routemanager
import (
"context"
"fmt"
"net"
"net/netip"
"net/url"
"runtime"
"sync"
@ -15,8 +19,14 @@ import (
"github.com/netbirdio/netbird/version"
)
var defaultv4 = netip.PrefixFrom(netip.IPv4Unspecified(), 0)
// nolint:unused
var defaultv6 = netip.PrefixFrom(netip.IPv6Unspecified(), 0)
// Manager is a route manager interface
type Manager interface {
Init() (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error)
UpdateRoutes(updateSerial uint64, newRoutes []*route.Route) error
SetRouteChangeListener(listener listener.NetworkChangeListener)
InitialRouteRange() []string
@ -56,6 +66,24 @@ func NewManager(ctx context.Context, pubKey string, wgInterface *iface.WGIface,
return dm
}
// Init sets up the routing
func (m *DefaultManager) Init() (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error) {
if err := cleanupRouting(); err != nil {
log.Warnf("Failed cleaning up routing: %v", err)
}
mgmtAddress := m.statusRecorder.GetManagementState().URL
signalAddress := m.statusRecorder.GetSignalState().URL
ips := resolveURLsToIPs([]string{mgmtAddress, signalAddress})
beforePeerHook, afterPeerHook, err := setupRouting(ips, m.wgInterface)
if err != nil {
return nil, nil, fmt.Errorf("setup routing: %w", err)
}
log.Info("Routing setup complete")
return beforePeerHook, afterPeerHook, nil
}
func (m *DefaultManager) EnableServerRouter(firewall firewall.Manager) error {
var err error
m.serverRouter, err = newServerRouter(m.ctx, m.wgInterface, firewall, m.statusRecorder)
@ -71,9 +99,15 @@ func (m *DefaultManager) Stop() {
if m.serverRouter != nil {
m.serverRouter.cleanUp()
}
if err := cleanupRouting(); err != nil {
log.Errorf("Error cleaning up routing: %v", err)
} else {
log.Info("Routing cleanup complete")
}
m.ctx = nil
}
// UpdateRoutes compares received routes with existing routes and remove, update or add them to the client and server maps
// UpdateRoutes compares received routes with existing routes and removes, updates or adds them to the client and server maps
func (m *DefaultManager) UpdateRoutes(updateSerial uint64, newRoutes []*route.Route) error {
select {
case <-m.ctx.Done():
@ -91,7 +125,7 @@ func (m *DefaultManager) UpdateRoutes(updateSerial uint64, newRoutes []*route.Ro
if m.serverRouter != nil {
err := m.serverRouter.updateRoutes(newServerRoutesMap)
if err != nil {
return err
return fmt.Errorf("update routes: %w", err)
}
}
@ -156,11 +190,7 @@ func (m *DefaultManager) classifiesRoutes(newRoutes []*route.Route) (map[string]
for _, newRoute := range newRoutes {
networkID := route.GetHAUniqueID(newRoute)
if !ownNetworkIDs[networkID] {
// if prefix is too small, lets assume is a possible default route which is not yet supported
// we skip this route management
if newRoute.Network.Bits() < minRangeBits {
log.Errorf("this agent version: %s, doesn't support default routes, received %s, skipping this route",
version.NetbirdVersion(), newRoute.Network)
if !isPrefixSupported(newRoute.Network) {
continue
}
newClientRoutesIDMap[networkID] = append(newClientRoutesIDMap[networkID], newRoute)
@ -178,3 +208,38 @@ func (m *DefaultManager) clientRoutes(initialRoutes []*route.Route) []*route.Rou
}
return rs
}
func isPrefixSupported(prefix netip.Prefix) bool {
switch runtime.GOOS {
case "linux", "windows", "darwin":
return true
}
// If prefix is too small, lets assume it is a possible default prefix which is not yet supported
// we skip this prefix management
if prefix.Bits() <= minRangeBits {
log.Warnf("This agent version: %s, doesn't support default routes, received %s, skipping this prefix",
version.NetbirdVersion(), prefix)
return false
}
return true
}
// resolveURLsToIPs takes a slice of URLs, resolves them to IP addresses and returns a slice of IPs.
func resolveURLsToIPs(urls []string) []net.IP {
var ips []net.IP
for _, rawurl := range urls {
u, err := url.Parse(rawurl)
if err != nil {
log.Errorf("Failed to parse url %s: %v", rawurl, err)
continue
}
ipAddrs, err := net.LookupIP(u.Hostname())
if err != nil {
log.Errorf("Failed to resolve host %s: %v", u.Hostname(), err)
continue
}
ips = append(ips, ipAddrs...)
}
return ips
}

30
client/internal/routemanager/manager_test.go
View File

@ -28,13 +28,14 @@ const remotePeerKey2 = "remote1"
func TestManagerUpdateRoutes(t *testing.T) {
testCases := []struct {
name string
inputInitRoutes []*route.Route
inputRoutes []*route.Route
inputSerial uint64
removeSrvRouter bool
serverRoutesExpected int
clientNetworkWatchersExpected int
name string
inputInitRoutes []*route.Route
inputRoutes []*route.Route
inputSerial uint64
removeSrvRouter bool
serverRoutesExpected int
clientNetworkWatchersExpected int
clientNetworkWatchersExpectedAllowed int
}{
{
name: "Should create 2 client networks",
@ -200,8 +201,9 @@ func TestManagerUpdateRoutes(t *testing.T) {
Enabled: true,
},
},
inputSerial: 1,
clientNetworkWatchersExpected: 0,
inputSerial: 1,
clientNetworkWatchersExpected: 0,
clientNetworkWatchersExpectedAllowed: 1,
},
{
name: "Remove 1 Client Route",
@ -415,6 +417,10 @@ func TestManagerUpdateRoutes(t *testing.T) {
statusRecorder := peer.NewRecorder("https://mgm")
ctx := context.TODO()
routeManager := NewManager(ctx, localPeerKey, wgInterface, statusRecorder, nil)
_, _, err = routeManager.Init()
require.NoError(t, err, "should init route manager")
defer routeManager.Stop()
if testCase.removeSrvRouter {
@ -429,7 +435,11 @@ func TestManagerUpdateRoutes(t *testing.T) {
err = routeManager.UpdateRoutes(testCase.inputSerial+uint64(len(testCase.inputInitRoutes)), testCase.inputRoutes)
require.NoError(t, err, "should update routes")
require.Len(t, routeManager.clientNetworks, testCase.clientNetworkWatchersExpected, "client networks size should match")
expectedWatchers := testCase.clientNetworkWatchersExpected
if (runtime.GOOS == "linux" || runtime.GOOS == "windows" || runtime.GOOS == "darwin") && testCase.clientNetworkWatchersExpectedAllowed != 0 {
expectedWatchers = testCase.clientNetworkWatchersExpectedAllowed
}
require.Len(t, routeManager.clientNetworks, expectedWatchers, "client networks size should match")
if runtime.GOOS == "linux" && routeManager.serverRouter != nil {
sr := routeManager.serverRouter.(*defaultServerRouter)

5
client/internal/routemanager/mock.go
View File

@ -6,6 +6,7 @@ import (
firewall "github.com/netbirdio/netbird/client/firewall/manager"
"github.com/netbirdio/netbird/client/internal/listener"
"github.com/netbirdio/netbird/client/internal/peer"
"github.com/netbirdio/netbird/iface"
"github.com/netbirdio/netbird/route"
)
@ -16,6 +17,10 @@ type MockManager struct {
StopFunc func()
}
func (m *MockManager) Init() (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error) {
return nil, nil, nil
}
// InitialRouteRange mock implementation of InitialRouteRange from Manager interface
func (m *MockManager) InitialRouteRange() []string {
return nil

126
client/internal/routemanager/routemanager.go Normal file
View File

@ -0,0 +1,126 @@
//go:build !android && !ios
package routemanager
import (
"errors"
"fmt"
"net/netip"
"sync"
"github.com/hashicorp/go-multierror"
log "github.com/sirupsen/logrus"
nbnet "github.com/netbirdio/netbird/util/net"
)
type ref struct {
count int
nexthop netip.Addr
intf string
}
type RouteManager struct {
// refCountMap keeps track of the reference ref for prefixes
refCountMap map[netip.Prefix]ref
// prefixMap keeps track of the prefixes associated with a connection ID for removal
prefixMap map[nbnet.ConnectionID][]netip.Prefix
addRoute AddRouteFunc
removeRoute RemoveRouteFunc
mutex sync.Mutex
}
type AddRouteFunc func(prefix netip.Prefix) (nexthop netip.Addr, intf string, err error)
type RemoveRouteFunc func(prefix netip.Prefix, nexthop netip.Addr, intf string) error
func NewRouteManager(addRoute AddRouteFunc, removeRoute RemoveRouteFunc) *RouteManager {
// TODO: read initial routing table into refCountMap
return &RouteManager{
refCountMap: map[netip.Prefix]ref{},
prefixMap: map[nbnet.ConnectionID][]netip.Prefix{},
addRoute: addRoute,
removeRoute: removeRoute,
}
}
func (rm *RouteManager) AddRouteRef(connID nbnet.ConnectionID, prefix netip.Prefix) error {
rm.mutex.Lock()
defer rm.mutex.Unlock()
ref := rm.refCountMap[prefix]
log.Debugf("Increasing route ref count %d for prefix %s", ref.count, prefix)
// Add route to the system, only if it's a new prefix
if ref.count == 0 {
log.Debugf("Adding route for prefix %s", prefix)
nexthop, intf, err := rm.addRoute(prefix)
if errors.Is(err, ErrRouteNotFound) {
return nil
}
if errors.Is(err, ErrRouteNotAllowed) {
log.Debugf("Adding route for prefix %s: %s", prefix, err)
}
if err != nil {
return fmt.Errorf("failed to add route for prefix %s: %w", prefix, err)
}
ref.nexthop = nexthop
ref.intf = intf
}
ref.count++
rm.refCountMap[prefix] = ref
rm.prefixMap[connID] = append(rm.prefixMap[connID], prefix)
return nil
}
func (rm *RouteManager) RemoveRouteRef(connID nbnet.ConnectionID) error {
rm.mutex.Lock()
defer rm.mutex.Unlock()
prefixes, ok := rm.prefixMap[connID]
if !ok {
log.Debugf("No prefixes found for connection ID %s", connID)
return nil
}
var result *multierror.Error
for _, prefix := range prefixes {
ref := rm.refCountMap[prefix]
log.Debugf("Decreasing route ref count %d for prefix %s", ref.count, prefix)
if ref.count == 1 {
log.Debugf("Removing route for prefix %s", prefix)
// TODO: don't fail if the route is not found
if err := rm.removeRoute(prefix, ref.nexthop, ref.intf); err != nil {
result = multierror.Append(result, fmt.Errorf("remove route for prefix %s: %w", prefix, err))
continue
}
delete(rm.refCountMap, prefix)
} else {
ref.count--
rm.refCountMap[prefix] = ref
}
}
delete(rm.prefixMap, connID)
return result.ErrorOrNil()
}
// Flush removes all references and routes from the system
func (rm *RouteManager) Flush() error {
rm.mutex.Lock()
defer rm.mutex.Unlock()
var result *multierror.Error
for prefix := range rm.refCountMap {
log.Debugf("Removing route for prefix %s", prefix)
ref := rm.refCountMap[prefix]
if err := rm.removeRoute(prefix, ref.nexthop, ref.intf); err != nil {
result = multierror.Append(result, fmt.Errorf("remove route for prefix %s: %w", prefix, err))
}
}
rm.refCountMap = map[netip.Prefix]ref{}
rm.prefixMap = map[nbnet.ConnectionID][]netip.Prefix{}
return result.ErrorOrNil()
}

57
client/internal/routemanager/server_nonandroid.go
View File

@ -4,6 +4,7 @@ package routemanager
import (
"context"
"fmt"
"net/netip"
"sync"
@ -48,7 +49,7 @@ func (m *defaultServerRouter) updateRoutes(routesMap map[string]*route.Route) er
oldRoute := m.routes[routeID]
err := m.removeFromServerNetwork(oldRoute)
if err != nil {
log.Errorf("unable to remove route id: %s, network %s, from server, got: %v",
log.Errorf("Unable to remove route id: %s, network %s, from server, got: %v",
oldRoute.ID, oldRoute.Network, err)
}
delete(m.routes, routeID)
@ -62,7 +63,7 @@ func (m *defaultServerRouter) updateRoutes(routesMap map[string]*route.Route) er
err := m.addToServerNetwork(newRoute)
if err != nil {
log.Errorf("unable to add route %s from server, got: %v", newRoute.ID, err)
log.Errorf("Unable to add route %s from server, got: %v", newRoute.ID, err)
continue
}
m.routes[id] = newRoute
@ -81,15 +82,22 @@ func (m *defaultServerRouter) updateRoutes(routesMap map[string]*route.Route) er
func (m *defaultServerRouter) removeFromServerNetwork(route *route.Route) error {
select {
case <-m.ctx.Done():
log.Infof("not removing from server network because context is done")
log.Infof("Not removing from server network because context is done")
return m.ctx.Err()
default:
m.mux.Lock()
defer m.mux.Unlock()
err := m.firewall.RemoveRoutingRules(routeToRouterPair(m.wgInterface.Address().String(), route))
routerPair, err := routeToRouterPair(m.wgInterface.Address().Masked().String(), route)
if err != nil {
return err
return fmt.Errorf("parse prefix: %w", err)
}
err = m.firewall.RemoveRoutingRules(routerPair)
if err != nil {
return fmt.Errorf("remove routing rules: %w", err)
}
delete(m.routes, route.ID)
state := m.statusRecorder.GetLocalPeerState()
@ -103,15 +111,22 @@ func (m *defaultServerRouter) removeFromServerNetwork(route *route.Route) error
func (m *defaultServerRouter) addToServerNetwork(route *route.Route) error {
select {
case <-m.ctx.Done():
log.Infof("not adding to server network because context is done")
log.Infof("Not adding to server network because context is done")
return m.ctx.Err()
default:
m.mux.Lock()
defer m.mux.Unlock()
err := m.firewall.InsertRoutingRules(routeToRouterPair(m.wgInterface.Address().String(), route))
routerPair, err := routeToRouterPair(m.wgInterface.Address().Masked().String(), route)
if err != nil {
return err
return fmt.Errorf("parse prefix: %w", err)
}
err = m.firewall.InsertRoutingRules(routerPair)
if err != nil {
return fmt.Errorf("insert routing rules: %w", err)
}
m.routes[route.ID] = route
state := m.statusRecorder.GetLocalPeerState()
@ -129,23 +144,33 @@ func (m *defaultServerRouter) cleanUp() {
m.mux.Lock()
defer m.mux.Unlock()
for _, r := range m.routes {
err := m.firewall.RemoveRoutingRules(routeToRouterPair(m.wgInterface.Address().String(), r))
routerPair, err := routeToRouterPair(m.wgInterface.Address().Masked().String(), r)
if err != nil {
log.Warnf("failed to remove clean up route: %s", r.ID)
log.Errorf("Failed to convert route to router pair: %v", err)
continue
}
err = m.firewall.RemoveRoutingRules(routerPair)
if err != nil {
log.Errorf("Failed to remove cleanup route: %v", err)
}
state := m.statusRecorder.GetLocalPeerState()
state.Routes = nil
m.statusRecorder.UpdateLocalPeerState(state)
}
state := m.statusRecorder.GetLocalPeerState()
state.Routes = nil
m.statusRecorder.UpdateLocalPeerState(state)
}
func routeToRouterPair(source string, route *route.Route) firewall.RouterPair {
parsed := netip.MustParsePrefix(source).Masked()
func routeToRouterPair(source string, route *route.Route) (firewall.RouterPair, error) {
parsed, err := netip.ParsePrefix(source)
if err != nil {
return firewall.RouterPair{}, err
}
return firewall.RouterPair{
ID: route.ID,
Source: parsed.String(),
Destination: route.Network.Masked().String(),
Masquerade: route.Masquerade,
}
}, nil
}

407
client/internal/routemanager/systemops.go Normal file
View File

@ -0,0 +1,407 @@
//go:build !android && !ios
package routemanager
import (
"context"
"errors"
"fmt"
"net"
"net/netip"
"github.com/hashicorp/go-multierror"
"github.com/libp2p/go-netroute"
log "github.com/sirupsen/logrus"
"github.com/netbirdio/netbird/client/internal/peer"
"github.com/netbirdio/netbird/iface"
nbnet "github.com/netbirdio/netbird/util/net"
)
var splitDefaultv4_1 = netip.PrefixFrom(netip.IPv4Unspecified(), 1)
var splitDefaultv4_2 = netip.PrefixFrom(netip.AddrFrom4([4]byte{128}), 1)
var splitDefaultv6_1 = netip.PrefixFrom(netip.IPv6Unspecified(), 1)
var splitDefaultv6_2 = netip.PrefixFrom(netip.AddrFrom16([16]byte{0x80}), 1)
var ErrRouteNotFound = errors.New("route not found")
var ErrRouteNotAllowed = errors.New("route not allowed")
// TODO: fix: for default our wg address now appears as the default gw
func addRouteForCurrentDefaultGateway(prefix netip.Prefix) error {
addr := netip.IPv4Unspecified()
if prefix.Addr().Is6() {
addr = netip.IPv6Unspecified()
}
defaultGateway, _, err := getNextHop(addr)
if err != nil && !errors.Is(err, ErrRouteNotFound) {
return fmt.Errorf("get existing route gateway: %s", err)
}
if !prefix.Contains(defaultGateway) {
log.Debugf("Skipping adding a new route for gateway %s because it is not in the network %s", defaultGateway, prefix)
return nil
}
gatewayPrefix := netip.PrefixFrom(defaultGateway, 32)
if defaultGateway.Is6() {
gatewayPrefix = netip.PrefixFrom(defaultGateway, 128)
}
ok, err := existsInRouteTable(gatewayPrefix)
if err != nil {
return fmt.Errorf("unable to check if there is an existing route for gateway %s. error: %s", gatewayPrefix, err)
}
if ok {
log.Debugf("Skipping adding a new route for gateway %s because it already exists", gatewayPrefix)
return nil
}
var exitIntf string
gatewayHop, intf, err := getNextHop(defaultGateway)
if err != nil && !errors.Is(err, ErrRouteNotFound) {
return fmt.Errorf("unable to get the next hop for the default gateway address. error: %s", err)
}
if intf != nil {
exitIntf = intf.Name
}
log.Debugf("Adding a new route for gateway %s with next hop %s", gatewayPrefix, gatewayHop)
return addToRouteTable(gatewayPrefix, gatewayHop, exitIntf)
}
func getNextHop(ip netip.Addr) (netip.Addr, *net.Interface, error) {
r, err := netroute.New()
if err != nil {
return netip.Addr{}, nil, fmt.Errorf("new netroute: %w", err)
}
intf, gateway, preferredSrc, err := r.Route(ip.AsSlice())
if err != nil {
log.Warnf("Failed to get route for %s: %v", ip, err)
return netip.Addr{}, nil, ErrRouteNotFound
}
log.Debugf("Route for %s: interface %v, nexthop %v, preferred source %v", ip, intf, gateway, preferredSrc)
if gateway == nil {
if preferredSrc == nil {
return netip.Addr{}, nil, ErrRouteNotFound
}
log.Debugf("No next hop found for ip %s, using preferred source %s", ip, preferredSrc)
addr, ok := netip.AddrFromSlice(preferredSrc)
if !ok {
return netip.Addr{}, nil, fmt.Errorf("failed to parse IP address: %s", preferredSrc)
}
return addr.Unmap(), intf, nil
}
addr, ok := netip.AddrFromSlice(gateway)
if !ok {
return netip.Addr{}, nil, fmt.Errorf("failed to parse IP address: %s", gateway)
}
return addr.Unmap(), intf, nil
}
func existsInRouteTable(prefix netip.Prefix) (bool, error) {
routes, err := getRoutesFromTable()
if err != nil {
return false, fmt.Errorf("get routes from table: %w", err)
}
for _, tableRoute := range routes {
if tableRoute == prefix {
return true, nil
}
}
return false, nil
}
func isSubRange(prefix netip.Prefix) (bool, error) {
routes, err := getRoutesFromTable()
if err != nil {
return false, fmt.Errorf("get routes from table: %w", err)
}
for _, tableRoute := range routes {
if tableRoute.Bits() > minRangeBits && tableRoute.Contains(prefix.Addr()) && tableRoute.Bits() < prefix.Bits() {
return true, nil
}
}
return false, nil
}
// addRouteToNonVPNIntf adds a new route to the routing table for the given prefix and returns the next hop and interface.
// If the next hop or interface is pointing to the VPN interface, it will return the initial values.
func addRouteToNonVPNIntf(
prefix netip.Prefix,
vpnIntf *iface.WGIface,
initialNextHop netip.Addr,
initialIntf *net.Interface,
) (netip.Addr, string, error) {
addr := prefix.Addr()
switch {
case addr.IsLoopback(),
addr.IsLinkLocalUnicast(),
addr.IsLinkLocalMulticast(),
addr.IsInterfaceLocalMulticast(),
addr.IsUnspecified(),
addr.IsMulticast():
return netip.Addr{}, "", ErrRouteNotAllowed
}
// Determine the exit interface and next hop for the prefix, so we can add a specific route
nexthop, intf, err := getNextHop(addr)
if err != nil {
return netip.Addr{}, "", fmt.Errorf("get next hop: %w", err)
}
log.Debugf("Found next hop %s for prefix %s with interface %v", nexthop, prefix, intf)
exitNextHop := nexthop
var exitIntf string
if intf != nil {
exitIntf = intf.Name
}
vpnAddr, ok := netip.AddrFromSlice(vpnIntf.Address().IP)
if !ok {
return netip.Addr{}, "", fmt.Errorf("failed to convert vpn address to netip.Addr")
}
// if next hop is the VPN address or the interface is the VPN interface, we should use the initial values
if exitNextHop == vpnAddr || exitIntf == vpnIntf.Name() {
log.Debugf("Route for prefix %s is pointing to the VPN interface", prefix)
exitNextHop = initialNextHop
if initialIntf != nil {
exitIntf = initialIntf.Name
}
}
log.Debugf("Adding a new route for prefix %s with next hop %s", prefix, exitNextHop)
if err := addToRouteTable(prefix, exitNextHop, exitIntf); err != nil {
return netip.Addr{}, "", fmt.Errorf("add route to table: %w", err)
}
return exitNextHop, exitIntf, nil
}
// genericAddVPNRoute adds a new route to the vpn interface, it splits the default prefix
// in two /1 prefixes to avoid replacing the existing default route
func genericAddVPNRoute(prefix netip.Prefix, intf string) error {
if prefix == defaultv4 {
if err := addToRouteTable(splitDefaultv4_1, netip.Addr{}, intf); err != nil {
return err
}
if err := addToRouteTable(splitDefaultv4_2, netip.Addr{}, intf); err != nil {
if err2 := removeFromRouteTable(splitDefaultv4_1, netip.Addr{}, intf); err2 != nil {
log.Warnf("Failed to rollback route addition: %s", err2)
}
return err
}
// TODO: remove once IPv6 is supported on the interface
if err := addToRouteTable(splitDefaultv6_1, netip.Addr{}, intf); err != nil {
return fmt.Errorf("add unreachable route split 1: %w", err)
}
if err := addToRouteTable(splitDefaultv6_2, netip.Addr{}, intf); err != nil {
if err2 := removeFromRouteTable(splitDefaultv6_1, netip.Addr{}, intf); err2 != nil {
log.Warnf("Failed to rollback route addition: %s", err2)
}
return fmt.Errorf("add unreachable route split 2: %w", err)
}
return nil
} else if prefix == defaultv6 {
if err := addToRouteTable(splitDefaultv6_1, netip.Addr{}, intf); err != nil {
return fmt.Errorf("add unreachable route split 1: %w", err)
}
if err := addToRouteTable(splitDefaultv6_2, netip.Addr{}, intf); err != nil {
if err2 := removeFromRouteTable(splitDefaultv6_1, netip.Addr{}, intf); err2 != nil {
log.Warnf("Failed to rollback route addition: %s", err2)
}
return fmt.Errorf("add unreachable route split 2: %w", err)
}
return nil
}
return addNonExistingRoute(prefix, intf)
}
// addNonExistingRoute adds a new route to the vpn interface if it doesn't exist in the current routing table
func addNonExistingRoute(prefix netip.Prefix, intf string) error {
ok, err := existsInRouteTable(prefix)
if err != nil {
return fmt.Errorf("exists in route table: %w", err)
}
if ok {
log.Warnf("Skipping adding a new route for network %s because it already exists", prefix)
return nil
}
ok, err = isSubRange(prefix)
if err != nil {
return fmt.Errorf("sub range: %w", err)
}
if ok {
err := addRouteForCurrentDefaultGateway(prefix)
if err != nil {
log.Warnf("Unable to add route for current default gateway route. Will proceed without it. error: %s", err)
}
}
return addToRouteTable(prefix, netip.Addr{}, intf)
}
// genericRemoveVPNRoute removes the route from the vpn interface. If a default prefix is given,
// it will remove the split /1 prefixes
func genericRemoveVPNRoute(prefix netip.Prefix, intf string) error {
if prefix == defaultv4 {
var result *multierror.Error
if err := removeFromRouteTable(splitDefaultv4_1, netip.Addr{}, intf); err != nil {
result = multierror.Append(result, err)
}
if err := removeFromRouteTable(splitDefaultv4_2, netip.Addr{}, intf); err != nil {
result = multierror.Append(result, err)
}
// TODO: remove once IPv6 is supported on the interface
if err := removeFromRouteTable(splitDefaultv6_1, netip.Addr{}, intf); err != nil {
result = multierror.Append(result, err)
}
if err := removeFromRouteTable(splitDefaultv6_2, netip.Addr{}, intf); err != nil {
result = multierror.Append(result, err)
}
return result.ErrorOrNil()
} else if prefix == defaultv6 {
var result *multierror.Error
if err := removeFromRouteTable(splitDefaultv6_1, netip.Addr{}, intf); err != nil {
result = multierror.Append(result, err)
}
if err := removeFromRouteTable(splitDefaultv6_2, netip.Addr{}, intf); err != nil {
result = multierror.Append(result, err)
}
return result.ErrorOrNil()
}
return removeFromRouteTable(prefix, netip.Addr{}, intf)
}
func getPrefixFromIP(ip net.IP) (*netip.Prefix, error) {
addr, ok := netip.AddrFromSlice(ip)
if !ok {
return nil, fmt.Errorf("parse IP address: %s", ip)
}
addr = addr.Unmap()
var prefixLength int
switch {
case addr.Is4():
prefixLength = 32
case addr.Is6():
prefixLength = 128
default:
return nil, fmt.Errorf("invalid IP address: %s", addr)
}
prefix := netip.PrefixFrom(addr, prefixLength)
return &prefix, nil
}
func setupRoutingWithRouteManager(routeManager **RouteManager, initAddresses []net.IP, wgIface *iface.WGIface) (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error) {
initialNextHopV4, initialIntfV4, err := getNextHop(netip.IPv4Unspecified())
if err != nil && !errors.Is(err, ErrRouteNotFound) {
log.Errorf("Unable to get initial v4 default next hop: %v", err)
}
initialNextHopV6, initialIntfV6, err := getNextHop(netip.IPv6Unspecified())
if err != nil && !errors.Is(err, ErrRouteNotFound) {
log.Errorf("Unable to get initial v6 default next hop: %v", err)
}
*routeManager = NewRouteManager(
func(prefix netip.Prefix) (netip.Addr, string, error) {
addr := prefix.Addr()
nexthop, intf := initialNextHopV4, initialIntfV4
if addr.Is6() {
nexthop, intf = initialNextHopV6, initialIntfV6
}
return addRouteToNonVPNIntf(prefix, wgIface, nexthop, intf)
},
removeFromRouteTable,
)
return setupHooks(*routeManager, initAddresses)
}
func cleanupRoutingWithRouteManager(routeManager *RouteManager) error {
if routeManager == nil {
return nil
}
// TODO: Remove hooks selectively
nbnet.RemoveDialerHooks()
nbnet.RemoveListenerHooks()
if err := routeManager.Flush(); err != nil {
return fmt.Errorf("flush route manager: %w", err)
}
return nil
}
func setupHooks(routeManager *RouteManager, initAddresses []net.IP) (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error) {
beforeHook := func(connID nbnet.ConnectionID, ip net.IP) error {
prefix, err := getPrefixFromIP(ip)
if err != nil {
return fmt.Errorf("convert ip to prefix: %w", err)
}
if err := routeManager.AddRouteRef(connID, *prefix); err != nil {
return fmt.Errorf("adding route reference: %v", err)
}
return nil
}
afterHook := func(connID nbnet.ConnectionID) error {
if err := routeManager.RemoveRouteRef(connID); err != nil {
return fmt.Errorf("remove route reference: %w", err)
}
return nil
}
for _, ip := range initAddresses {
if err := beforeHook("init", ip); err != nil {
log.Errorf("Failed to add route reference: %v", err)
}
}
nbnet.AddDialerHook(func(ctx context.Context, connID nbnet.ConnectionID, resolvedIPs []net.IPAddr) error {
if ctx.Err() != nil {
return ctx.Err()
}
var result *multierror.Error
for _, ip := range resolvedIPs {
result = multierror.Append(result, beforeHook(connID, ip.IP))
}
return result.ErrorOrNil()
})
nbnet.AddDialerCloseHook(func(connID nbnet.ConnectionID, conn *net.Conn) error {
return afterHook(connID)
})
nbnet.AddListenerWriteHook(func(connID nbnet.ConnectionID, ip *net.IPAddr, data []byte) error {
return beforeHook(connID, ip.IP)
})
nbnet.AddListenerCloseHook(func(connID nbnet.ConnectionID, conn net.PacketConn) error {
return afterHook(connID)
})
return beforeHook, afterHook, nil
}

24
client/internal/routemanager/systemops_android.go
View File

@ -1,13 +1,33 @@
package routemanager
import (
"net"
"net/netip"
"runtime"
log "github.com/sirupsen/logrus"
"github.com/netbirdio/netbird/client/internal/peer"
"github.com/netbirdio/netbird/iface"
)
func addToRouteTableIfNoExists(prefix netip.Prefix, addr string) error {
func setupRouting([]net.IP, *iface.WGIface) (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error) {
return nil, nil, nil
}
func cleanupRouting() error {
return nil
}
func removeFromRouteTableIfNonSystem(prefix netip.Prefix, addr string) error {
func enableIPForwarding() error {
log.Infof("Enable IP forwarding is not implemented on %s", runtime.GOOS)
return nil
}
func addVPNRoute(netip.Prefix, string) error {
return nil
}
func removeVPNRoute(netip.Prefix, string) error {
return nil
}

1
client/internal/routemanager/systemops_bsd.go
View File

@ -1,5 +1,4 @@
//go:build darwin || dragonfly || freebsd || netbsd || openbsd
// +build darwin dragonfly freebsd netbsd openbsd
package routemanager

61
client/internal/routemanager/systemops_darwin.go Normal file
View File

@ -0,0 +1,61 @@
//go:build darwin && !ios
package routemanager
import (
"fmt"
"net"
"net/netip"
"os/exec"
"strings"
log "github.com/sirupsen/logrus"
"github.com/netbirdio/netbird/client/internal/peer"
"github.com/netbirdio/netbird/iface"
)
var routeManager *RouteManager
func setupRouting(initAddresses []net.IP, wgIface *iface.WGIface) (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error) {
return setupRoutingWithRouteManager(&routeManager, initAddresses, wgIface)
}
func cleanupRouting() error {
return cleanupRoutingWithRouteManager(routeManager)
}
func addToRouteTable(prefix netip.Prefix, nexthop netip.Addr, intf string) error {
return routeCmd("add", prefix, nexthop, intf)
}
func removeFromRouteTable(prefix netip.Prefix, nexthop netip.Addr, intf string) error {
return routeCmd("delete", prefix, nexthop, intf)
}
func routeCmd(action string, prefix netip.Prefix, nexthop netip.Addr, intf string) error {
inet := "-inet"
if prefix.Addr().Is6() {
inet = "-inet6"
// Special case for IPv6 split default route, pointing to the wg interface fails
// TODO: Remove once we have IPv6 support on the interface
if prefix.Bits() == 1 {
intf = "lo0"
}
}
args := []string{"-n", action, inet, prefix.String()}
if nexthop.IsValid() {
args = append(args, nexthop.Unmap().String())
} else if intf != "" {
args = append(args, "-interface", intf)
}
out, err := exec.Command("route", args...).CombinedOutput()
log.Tracef("route %s: %s", strings.Join(args, " "), out)
if err != nil {
return fmt.Errorf("failed to %s route for %s: %w", action, prefix, err)
}
return nil
}

100
client/internal/routemanager/systemops_darwin_test.go Normal file
View File

@ -0,0 +1,100 @@
//go:build !ios
package routemanager
import (
"fmt"
"net"
"os/exec"
"regexp"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var expectedVPNint = "utun100"
var expectedExternalInt = "lo0"
var expectedInternalInt = "lo0"
func init() {
testCases = append(testCases, []testCase{
{
name: "To more specific route without custom dialer via vpn",
destination: "10.10.0.2:53",
expectedInterface: expectedVPNint,
dialer: &net.Dialer{},
expectedPacket: createPacketExpectation("100.64.0.1", 12345, "10.10.0.2", 53),
},
}...)
}
func createAndSetupDummyInterface(t *testing.T, intf string, ipAddressCIDR string) string {
t.Helper()
err := exec.Command("ifconfig", intf, "alias", ipAddressCIDR).Run()
require.NoError(t, err, "Failed to create loopback alias")
t.Cleanup(func() {
err := exec.Command("ifconfig", intf, ipAddressCIDR, "-alias").Run()
assert.NoError(t, err, "Failed to remove loopback alias")
})
return "lo0"
}
func addDummyRoute(t *testing.T, dstCIDR string, gw net.IP, _ string) {
t.Helper()
var originalNexthop net.IP
if dstCIDR == "0.0.0.0/0" {
var err error
originalNexthop, err = fetchOriginalGateway()
if err != nil {
t.Logf("Failed to fetch original gateway: %v", err)
}
if output, err := exec.Command("route", "delete", "-net", dstCIDR).CombinedOutput(); err != nil {
t.Logf("Failed to delete route: %v, output: %s", err, output)
}
}
t.Cleanup(func() {
if originalNexthop != nil {
err := exec.Command("route", "add", "-net", dstCIDR, originalNexthop.String()).Run()
assert.NoError(t, err, "Failed to restore original route")
}
})
err := exec.Command("route", "add", "-net", dstCIDR, gw.String()).Run()
require.NoError(t, err, "Failed to add route")
t.Cleanup(func() {
err := exec.Command("route", "delete", "-net", dstCIDR).Run()
assert.NoError(t, err, "Failed to remove route")
})
}
func fetchOriginalGateway() (net.IP, error) {
output, err := exec.Command("route", "-n", "get", "default").CombinedOutput()
if err != nil {
return nil, err
}
matches := regexp.MustCompile(`gateway: (\S+)`).FindStringSubmatch(string(output))
if len(matches) == 0 {
return nil, fmt.Errorf("gateway not found")
}
return net.ParseIP(matches[1]), nil
}
func setupDummyInterfacesAndRoutes(t *testing.T) {
t.Helper()
defaultDummy := createAndSetupDummyInterface(t, expectedExternalInt, "192.168.0.1/24")
addDummyRoute(t, "0.0.0.0/0", net.IPv4(192, 168, 0, 1), defaultDummy)
otherDummy := createAndSetupDummyInterface(t, expectedInternalInt, "192.168.1.1/24")
addDummyRoute(t, "10.0.0.0/8", net.IPv4(192, 168, 1, 1), otherDummy)
}

26
client/internal/routemanager/systemops_ios.go
View File

@ -1,15 +1,33 @@
//go:build ios
package routemanager
import (
"net"
"net/netip"
"runtime"
log "github.com/sirupsen/logrus"
"github.com/netbirdio/netbird/client/internal/peer"
"github.com/netbirdio/netbird/iface"
)
func addToRouteTableIfNoExists(prefix netip.Prefix, addr string) error {
func setupRouting([]net.IP, *iface.WGIface) (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error) {
return nil, nil, nil
}
func cleanupRouting() error {
return nil
}
func removeFromRouteTableIfNonSystem(prefix netip.Prefix, addr string) error {
func enableIPForwarding() error {
log.Infof("Enable IP forwarding is not implemented on %s", runtime.GOOS)
return nil
}
func addVPNRoute(netip.Prefix, string) error {
return nil
}
func removeVPNRoute(netip.Prefix, string) error {
return nil
}

531
client/internal/routemanager/systemops_linux.go
View File

@ -3,142 +3,342 @@
package routemanager
import (
"bufio"
"context"
"errors"
"fmt"
"net"
"net/netip"
"os"
"syscall"
"unsafe"
"time"
"github.com/hashicorp/go-multierror"
log "github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
"github.com/netbirdio/netbird/client/internal/peer"
"github.com/netbirdio/netbird/iface"
nbnet "github.com/netbirdio/netbird/util/net"
)
// Pulled from http://man7.org/linux/man-pages/man7/rtnetlink.7.html
// See the section on RTM_NEWROUTE, specifically 'struct rtmsg'.
type routeInfoInMemory struct {
Family byte
DstLen byte
SrcLen byte
TOS byte
const (
// NetbirdVPNTableID is the ID of the custom routing table used by Netbird.
NetbirdVPNTableID = 0x1BD0
// NetbirdVPNTableName is the name of the custom routing table used by Netbird.
NetbirdVPNTableName = "netbird"
Table byte
Protocol byte
Scope byte
Type byte
// rtTablesPath is the path to the file containing the routing table names.
rtTablesPath = "/etc/iproute2/rt_tables"
Flags uint32
// ipv4ForwardingPath is the path to the file containing the IP forwarding setting.
ipv4ForwardingPath = "/proc/sys/net/ipv4/ip_forward"
)
var ErrTableIDExists = errors.New("ID exists with different name")
var routeManager = &RouteManager{}
var isLegacy = os.Getenv("NB_USE_LEGACY_ROUTING") == "true"
type ruleParams struct {
fwmark int
tableID int
family int
priority int
invert bool
suppressPrefix int
description string
}
const ipv4ForwardingPath = "/proc/sys/net/ipv4/ip_forward"
func getSetupRules() []ruleParams {
return []ruleParams{
{nbnet.NetbirdFwmark, NetbirdVPNTableID, netlink.FAMILY_V4, -1, true, -1, "rule v4 netbird"},
{nbnet.NetbirdFwmark, NetbirdVPNTableID, netlink.FAMILY_V6, -1, true, -1, "rule v6 netbird"},
{-1, syscall.RT_TABLE_MAIN, netlink.FAMILY_V4, -1, false, 0, "rule with suppress prefixlen v4"},
{-1, syscall.RT_TABLE_MAIN, netlink.FAMILY_V6, -1, false, 0, "rule with suppress prefixlen v6"},
}
}
func addToRouteTable(prefix netip.Prefix, addr string) error {
_, ipNet, err := net.ParseCIDR(prefix.String())
if err != nil {
return err
// setupRouting establishes the routing configuration for the VPN, including essential rules
// to ensure proper traffic flow for management, locally configured routes, and VPN traffic.
//
// Rule 1 (Main Route Precedence): Safeguards locally installed routes by giving them precedence over
// potential routes received and configured for the VPN. This rule is skipped for the default route and routes
// that are not in the main table.
//
// Rule 2 (VPN Traffic Routing): Directs all remaining traffic to the 'NetbirdVPNTableID' custom routing table.
// This table is where a default route or other specific routes received from the management server are configured,
// enabling VPN connectivity.
//
// The rules are inserted in reverse order, as rules are added from the bottom up in the rule list.
func setupRouting(initAddresses []net.IP, wgIface *iface.WGIface) (_ peer.BeforeAddPeerHookFunc, _ peer.AfterRemovePeerHookFunc, err error) {
if isLegacy {
log.Infof("Using legacy routing setup")
return setupRoutingWithRouteManager(&routeManager, initAddresses, wgIface)
}
addrMask := "/32"
if prefix.Addr().Unmap().Is6() {
addrMask = "/128"
if err = addRoutingTableName(); err != nil {
log.Errorf("Error adding routing table name: %v", err)
}
ip, _, err := net.ParseCIDR(addr + addrMask)
if err != nil {
return err
defer func() {
if err != nil {
if cleanErr := cleanupRouting(); cleanErr != nil {
log.Errorf("Error cleaning up routing: %v", cleanErr)
}
}
}()
rules := getSetupRules()
for _, rule := range rules {
if err := addRule(rule); err != nil {
if errors.Is(err, syscall.EOPNOTSUPP) {
log.Warnf("Rule operations are not supported, falling back to the legacy routing setup")
isLegacy = true
return setupRoutingWithRouteManager(&routeManager, initAddresses, wgIface)
}
return nil, nil, fmt.Errorf("%s: %w", rule.description, err)
}
}
route := &netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
Dst: ipNet,
Gw: ip,
return nil, nil, nil
}
// cleanupRouting performs a thorough cleanup of the routing configuration established by 'setupRouting'.
// It systematically removes the three rules and any associated routing table entries to ensure a clean state.
// The function uses error aggregation to report any errors encountered during the cleanup process.
func cleanupRouting() error {
if isLegacy {
return cleanupRoutingWithRouteManager(routeManager)
}
err = netlink.RouteAdd(route)
if err != nil {
return err
var result *multierror.Error
if err := flushRoutes(NetbirdVPNTableID, netlink.FAMILY_V4); err != nil {
result = multierror.Append(result, fmt.Errorf("flush routes v4: %w", err))
}
if err := flushRoutes(NetbirdVPNTableID, netlink.FAMILY_V6); err != nil {
result = multierror.Append(result, fmt.Errorf("flush routes v6: %w", err))
}
rules := getSetupRules()
for _, rule := range rules {
if err := removeAllRules(rule); err != nil && !errors.Is(err, syscall.EOPNOTSUPP) {
result = multierror.Append(result, fmt.Errorf("%s: %w", rule.description, err))
}
}
return result.ErrorOrNil()
}
func addToRouteTable(prefix netip.Prefix, nexthop netip.Addr, intf string) error {
return addRoute(prefix, nexthop, intf, syscall.RT_TABLE_MAIN)
}
func removeFromRouteTable(prefix netip.Prefix, nexthop netip.Addr, intf string) error {
return removeRoute(prefix, nexthop, intf, syscall.RT_TABLE_MAIN)
}
func addVPNRoute(prefix netip.Prefix, intf string) error {
if isLegacy {
return genericAddVPNRoute(prefix, intf)
}
// No need to check if routes exist as main table takes precedence over the VPN table via Rule 1
// TODO remove this once we have ipv6 support
if prefix == defaultv4 {
if err := addUnreachableRoute(defaultv6, NetbirdVPNTableID); err != nil {
return fmt.Errorf("add blackhole: %w", err)
}
}
if err := addRoute(prefix, netip.Addr{}, intf, NetbirdVPNTableID); err != nil {
return fmt.Errorf("add route: %w", err)
}
return nil
}
func removeFromRouteTable(prefix netip.Prefix, addr string) error {
_, ipNet, err := net.ParseCIDR(prefix.String())
if err != nil {
return err
func removeVPNRoute(prefix netip.Prefix, intf string) error {
if isLegacy {
return genericRemoveVPNRoute(prefix, intf)
}
addrMask := "/32"
if prefix.Addr().Unmap().Is6() {
addrMask = "/128"
// TODO remove this once we have ipv6 support
if prefix == defaultv4 {
if err := removeUnreachableRoute(defaultv6, NetbirdVPNTableID); err != nil {
return fmt.Errorf("remove unreachable route: %w", err)
}
}
ip, _, err := net.ParseCIDR(addr + addrMask)
if err != nil {
return err
if err := removeRoute(prefix, netip.Addr{}, intf, NetbirdVPNTableID); err != nil {
return fmt.Errorf("remove route: %w", err)
}
route := &netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
Dst: ipNet,
Gw: ip,
}
err = netlink.RouteDel(route)
if err != nil {
return err
}
return nil
}
func getRoutesFromTable() ([]netip.Prefix, error) {
tab, err := syscall.NetlinkRIB(syscall.RTM_GETROUTE, syscall.AF_UNSPEC)
v4Routes, err := getRoutes(syscall.RT_TABLE_MAIN, netlink.FAMILY_V4)
if err != nil {
return nil, err
return nil, fmt.Errorf("get v4 routes: %w", err)
}
msgs, err := syscall.ParseNetlinkMessage(tab)
v6Routes, err := getRoutes(syscall.RT_TABLE_MAIN, netlink.FAMILY_V6)
if err != nil {
return nil, err
return nil, fmt.Errorf("get v6 routes: %w", err)
}
return append(v4Routes, v6Routes...), nil
}
// getRoutes fetches routes from a specific routing table identified by tableID.
func getRoutes(tableID, family int) ([]netip.Prefix, error) {
var prefixList []netip.Prefix
loop:
for _, m := range msgs {
switch m.Header.Type {
case syscall.NLMSG_DONE:
break loop
case syscall.RTM_NEWROUTE:
rt := (*routeInfoInMemory)(unsafe.Pointer(&m.Data[0]))
msg := m
attrs, err := syscall.ParseNetlinkRouteAttr(&msg)
if err != nil {
return nil, err
}
if rt.Family != syscall.AF_INET {
continue loop
routes, err := netlink.RouteListFiltered(family, &netlink.Route{Table: tableID}, netlink.RT_FILTER_TABLE)
if err != nil {
return nil, fmt.Errorf("list routes from table %d: %v", tableID, err)
}
for _, route := range routes {
if route.Dst != nil {
addr, ok := netip.AddrFromSlice(route.Dst.IP)
if !ok {
return nil, fmt.Errorf("parse route destination IP: %v", route.Dst.IP)
}
for _, attr := range attrs {
if attr.Attr.Type == syscall.RTA_DST {
addr, ok := netip.AddrFromSlice(attr.Value)
if !ok {
continue
}
mask := net.CIDRMask(int(rt.DstLen), len(attr.Value)*8)
cidr, _ := mask.Size()
routePrefix := netip.PrefixFrom(addr, cidr)
if routePrefix.IsValid() && routePrefix.Addr().Is4() {
prefixList = append(prefixList, routePrefix)
}
}
ones, _ := route.Dst.Mask.Size()
prefix := netip.PrefixFrom(addr, ones)
if prefix.IsValid() {
prefixList = append(prefixList, prefix)
}
}
}
return prefixList, nil
}
// addRoute adds a route to a specific routing table identified by tableID.
func addRoute(prefix netip.Prefix, addr netip.Addr, intf string, tableID int) error {
route := &netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
Table: tableID,
Family: getAddressFamily(prefix),
}
_, ipNet, err := net.ParseCIDR(prefix.String())
if err != nil {
return fmt.Errorf("parse prefix %s: %w", prefix, err)
}
route.Dst = ipNet
if err := addNextHop(addr, intf, route); err != nil {
return fmt.Errorf("add gateway and device: %w", err)
}
if err := netlink.RouteAdd(route); err != nil && !errors.Is(err, syscall.EEXIST) && !errors.Is(err, syscall.EAFNOSUPPORT) {
return fmt.Errorf("netlink add route: %w", err)
}
return nil
}
// addUnreachableRoute adds an unreachable route for the specified IP family and routing table.
// ipFamily should be netlink.FAMILY_V4 for IPv4 or netlink.FAMILY_V6 for IPv6.
// tableID specifies the routing table to which the unreachable route will be added.
func addUnreachableRoute(prefix netip.Prefix, tableID int) error {
_, ipNet, err := net.ParseCIDR(prefix.String())
if err != nil {
return fmt.Errorf("parse prefix %s: %w", prefix, err)
}
route := &netlink.Route{
Type: syscall.RTN_UNREACHABLE,
Table: tableID,
Family: getAddressFamily(prefix),
Dst: ipNet,
}
if err := netlink.RouteAdd(route); err != nil && !errors.Is(err, syscall.EEXIST) && !errors.Is(err, syscall.EAFNOSUPPORT) {
return fmt.Errorf("netlink add unreachable route: %w", err)
}
return nil
}
func removeUnreachableRoute(prefix netip.Prefix, tableID int) error {
_, ipNet, err := net.ParseCIDR(prefix.String())
if err != nil {
return fmt.Errorf("parse prefix %s: %w", prefix, err)
}
route := &netlink.Route{
Type: syscall.RTN_UNREACHABLE,
Table: tableID,
Family: getAddressFamily(prefix),
Dst: ipNet,
}
if err := netlink.RouteDel(route); err != nil && !errors.Is(err, syscall.ESRCH) && !errors.Is(err, syscall.EAFNOSUPPORT) {
return fmt.Errorf("netlink remove unreachable route: %w", err)
}
return nil
}
// removeRoute removes a route from a specific routing table identified by tableID.
func removeRoute(prefix netip.Prefix, addr netip.Addr, intf string, tableID int) error {
_, ipNet, err := net.ParseCIDR(prefix.String())
if err != nil {
return fmt.Errorf("parse prefix %s: %w", prefix, err)
}
route := &netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
Table: tableID,
Family: getAddressFamily(prefix),
Dst: ipNet,
}
if err := addNextHop(addr, intf, route); err != nil {
return fmt.Errorf("add gateway and device: %w", err)
}
if err := netlink.RouteDel(route); err != nil && !errors.Is(err, syscall.ESRCH) && !errors.Is(err, syscall.EAFNOSUPPORT) {
return fmt.Errorf("netlink remove route: %w", err)
}
return nil
}
func flushRoutes(tableID, family int) error {
routes, err := netlink.RouteListFiltered(family, &netlink.Route{Table: tableID}, netlink.RT_FILTER_TABLE)
if err != nil {
return fmt.Errorf("list routes from table %d: %w", tableID, err)
}
var result *multierror.Error
for i := range routes {
route := routes[i]
// unreachable default routes don't come back with Dst set
if route.Gw == nil && route.Src == nil && route.Dst == nil {
if family == netlink.FAMILY_V4 {
routes[i].Dst = &net.IPNet{IP: net.IPv4zero, Mask: net.CIDRMask(0, 32)}
} else {
routes[i].Dst = &net.IPNet{IP: net.IPv6zero, Mask: net.CIDRMask(0, 128)}
}
}
if err := netlink.RouteDel(&routes[i]); err != nil && !errors.Is(err, syscall.EAFNOSUPPORT) {
result = multierror.Append(result, fmt.Errorf("failed to delete route %v from table %d: %w", routes[i], tableID, err))
}
}
return result.ErrorOrNil()
}
func enableIPForwarding() error {
bytes, err := os.ReadFile(ipv4ForwardingPath)
if err != nil {
return err
return fmt.Errorf("read file %s: %w", ipv4ForwardingPath, err)
}
// check if it is already enabled
@ -147,5 +347,162 @@ func enableIPForwarding() error {
return nil
}
return os.WriteFile(ipv4ForwardingPath, []byte("1"), 0644) //nolint:gosec
//nolint:gosec
if err := os.WriteFile(ipv4ForwardingPath, []byte("1"), 0644); err != nil {
return fmt.Errorf("write file %s: %w", ipv4ForwardingPath, err)
}
return nil
}
// entryExists checks if the specified ID or name already exists in the rt_tables file
// and verifies if existing names start with "netbird_".
func entryExists(file *os.File, id int) (bool, error) {
if _, err := file.Seek(0, 0); err != nil {
return false, fmt.Errorf("seek rt_tables: %w", err)
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
var existingID int
var existingName string
if _, err := fmt.Sscanf(line, "%d %s\n", &existingID, &existingName); err == nil {
if existingID == id {
if existingName != NetbirdVPNTableName {
return true, ErrTableIDExists
}
return true, nil
}
}
}
if err := scanner.Err(); err != nil {
return false, fmt.Errorf("scan rt_tables: %w", err)
}
return false, nil
}
// addRoutingTableName adds human-readable names for custom routing tables.
func addRoutingTableName() error {
file, err := os.Open(rtTablesPath)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return nil
}
return fmt.Errorf("open rt_tables: %w", err)
}
defer func() {
if err := file.Close(); err != nil {
log.Errorf("Error closing rt_tables: %v", err)
}
}()
exists, err := entryExists(file, NetbirdVPNTableID)
if err != nil {
return fmt.Errorf("verify entry %d, %s: %w", NetbirdVPNTableID, NetbirdVPNTableName, err)
}
if exists {
return nil
}
// Reopen the file in append mode to add new entries
if err := file.Close(); err != nil {
log.Errorf("Error closing rt_tables before appending: %v", err)
}
file, err = os.OpenFile(rtTablesPath, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
if err != nil {
return fmt.Errorf("open rt_tables for appending: %w", err)
}
if _, err := file.WriteString(fmt.Sprintf("\n%d\t%s\n", NetbirdVPNTableID, NetbirdVPNTableName)); err != nil {
return fmt.Errorf("append entry to rt_tables: %w", err)
}
return nil
}
// addRule adds a routing rule to a specific routing table identified by tableID.
func addRule(params ruleParams) error {
rule := netlink.NewRule()
rule.Table = params.tableID
rule.Mark = params.fwmark
rule.Family = params.family
rule.Priority = params.priority
rule.Invert = params.invert
rule.SuppressPrefixlen = params.suppressPrefix
if err := netlink.RuleAdd(rule); err != nil && !errors.Is(err, syscall.EAFNOSUPPORT) {
return fmt.Errorf("add routing rule: %w", err)
}
return nil
}
// removeRule removes a routing rule from a specific routing table identified by tableID.
func removeRule(params ruleParams) error {
rule := netlink.NewRule()
rule.Table = params.tableID
rule.Mark = params.fwmark
rule.Family = params.family
rule.Invert = params.invert
rule.Priority = params.priority
rule.SuppressPrefixlen = params.suppressPrefix
if err := netlink.RuleDel(rule); err != nil {
return fmt.Errorf("remove routing rule: %w", err)
}
return nil
}
func removeAllRules(params ruleParams) error {
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
done := make(chan error, 1)
go func() {
for {
if ctx.Err() != nil {
done <- ctx.Err()
return
}
if err := removeRule(params); err != nil {
if errors.Is(err, syscall.ENOENT) || errors.Is(err, syscall.EAFNOSUPPORT) {
done <- nil
return
}
done <- err
return
}
}
}()
select {
case <-ctx.Done():
return ctx.Err()
case err := <-done:
return err
}
}
// addNextHop adds the gateway and device to the route.
func addNextHop(addr netip.Addr, intf string, route *netlink.Route) error {
if addr.IsValid() {
route.Gw = addr.AsSlice()
}
if intf != "" {
link, err := netlink.LinkByName(intf)
if err != nil {
return fmt.Errorf("set interface %s: %w", intf, err)
}
route.LinkIndex = link.Attrs().Index
}
return nil
}
func getAddressFamily(prefix netip.Prefix) int {
if prefix.Addr().Is4() {
return netlink.FAMILY_V4
}
return netlink.FAMILY_V6
}

207
client/internal/routemanager/systemops_linux_test.go Normal file
View File

@ -0,0 +1,207 @@
//go:build !android
package routemanager
import (
"errors"
"fmt"
"net"
"os"
"strings"
"syscall"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/vishvananda/netlink"
)
var expectedVPNint = "wgtest0"
var expectedLoopbackInt = "lo"
var expectedExternalInt = "dummyext0"
var expectedInternalInt = "dummyint0"
func init() {
testCases = append(testCases, []testCase{
{
name: "To more specific route without custom dialer via physical interface",
destination: "10.10.0.2:53",
expectedInterface: expectedInternalInt,
dialer: &net.Dialer{},
expectedPacket: createPacketExpectation("192.168.1.1", 12345, "10.10.0.2", 53),
},
{
name: "To more specific route (local) without custom dialer via physical interface",
destination: "127.0.10.1:53",
expectedInterface: expectedLoopbackInt,
dialer: &net.Dialer{},
expectedPacket: createPacketExpectation("127.0.0.1", 12345, "127.0.10.1", 53),
},
}...)
}
func TestEntryExists(t *testing.T) {
tempDir := t.TempDir()
tempFilePath := fmt.Sprintf("%s/rt_tables", tempDir)
content := []string{
"1000 reserved",
fmt.Sprintf("%d %s", NetbirdVPNTableID, NetbirdVPNTableName),
"9999 other_table",
}
require.NoError(t, os.WriteFile(tempFilePath, []byte(strings.Join(content, "\n")), 0644))
file, err := os.Open(tempFilePath)
require.NoError(t, err)
defer func() {
assert.NoError(t, file.Close())
}()
tests := []struct {
name string
id int
shouldExist bool
err error
}{
{
name: "ExistsWithNetbirdPrefix",
id: 7120,
shouldExist: true,
err: nil,
},
{
name: "ExistsWithDifferentName",
id: 1000,
shouldExist: true,
err: ErrTableIDExists,
},
{
name: "DoesNotExist",
id: 1234,
shouldExist: false,
err: nil,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
exists, err := entryExists(file, tc.id)
if tc.err != nil {
assert.ErrorIs(t, err, tc.err)
} else {
assert.NoError(t, err)
}
assert.Equal(t, tc.shouldExist, exists)
})
}
}
func createAndSetupDummyInterface(t *testing.T, interfaceName, ipAddressCIDR string) string {
t.Helper()
dummy := &netlink.Dummy{LinkAttrs: netlink.LinkAttrs{Name: interfaceName}}
err := netlink.LinkDel(dummy)
if err != nil && !errors.Is(err, syscall.EINVAL) {
t.Logf("Failed to delete dummy interface: %v", err)
}
err = netlink.LinkAdd(dummy)
require.NoError(t, err)
err = netlink.LinkSetUp(dummy)
require.NoError(t, err)
if ipAddressCIDR != "" {
addr, err := netlink.ParseAddr(ipAddressCIDR)
require.NoError(t, err)
err = netlink.AddrAdd(dummy, addr)
require.NoError(t, err)
}
t.Cleanup(func() {
err := netlink.LinkDel(dummy)
assert.NoError(t, err)
})
return dummy.Name
}
func addDummyRoute(t *testing.T, dstCIDR string, gw net.IP, intf string) {
t.Helper()
_, dstIPNet, err := net.ParseCIDR(dstCIDR)
require.NoError(t, err)
// Handle existing routes with metric 0
var originalNexthop net.IP
var originalLinkIndex int
if dstIPNet.String() == "0.0.0.0/0" {
var err error
originalNexthop, originalLinkIndex, err = fetchOriginalGateway(netlink.FAMILY_V4)
if err != nil && !errors.Is(err, ErrRouteNotFound) {
t.Logf("Failed to fetch original gateway: %v", err)
}
if originalNexthop != nil {
err = netlink.RouteDel(&netlink.Route{Dst: dstIPNet, Priority: 0})
switch {
case err != nil && !errors.Is(err, syscall.ESRCH):
t.Logf("Failed to delete route: %v", err)
case err == nil:
t.Cleanup(func() {
err := netlink.RouteAdd(&netlink.Route{Dst: dstIPNet, Gw: originalNexthop, LinkIndex: originalLinkIndex, Priority: 0})
if err != nil && !errors.Is(err, syscall.EEXIST) {
t.Fatalf("Failed to add route: %v", err)
}
})
default:
t.Logf("Failed to delete route: %v", err)
}
}
}
link, err := netlink.LinkByName(intf)
require.NoError(t, err)
linkIndex := link.Attrs().Index
route := &netlink.Route{
Dst: dstIPNet,
Gw: gw,
LinkIndex: linkIndex,
}
err = netlink.RouteDel(route)
if err != nil && !errors.Is(err, syscall.ESRCH) {
t.Logf("Failed to delete route: %v", err)
}
err = netlink.RouteAdd(route)
if err != nil && !errors.Is(err, syscall.EEXIST) {
t.Fatalf("Failed to add route: %v", err)
}
require.NoError(t, err)
}
func fetchOriginalGateway(family int) (net.IP, int, error) {
routes, err := netlink.RouteList(nil, family)
if err != nil {
return nil, 0, err
}
for _, route := range routes {
if route.Dst == nil && route.Priority == 0 {
return route.Gw, route.LinkIndex, nil
}
}
return nil, 0, ErrRouteNotFound
}
func setupDummyInterfacesAndRoutes(t *testing.T) {
t.Helper()
defaultDummy := createAndSetupDummyInterface(t, "dummyext0", "192.168.0.1/24")
addDummyRoute(t, "0.0.0.0/0", net.IPv4(192, 168, 0, 1), defaultDummy)
otherDummy := createAndSetupDummyInterface(t, "dummyint0", "192.168.1.1/24")
addDummyRoute(t, "10.0.0.0/8", net.IPv4(192, 168, 1, 1), otherDummy)
}

120
client/internal/routemanager/systemops_nonandroid.go
View File

@ -1,120 +0,0 @@
//go:build !android && !ios
package routemanager
import (
"fmt"
"net"
"net/netip"
"github.com/libp2p/go-netroute"
log "github.com/sirupsen/logrus"
)
var errRouteNotFound = fmt.Errorf("route not found")
func addToRouteTableIfNoExists(prefix netip.Prefix, addr string) error {
ok, err := existsInRouteTable(prefix)
if err != nil {
return err
}
if ok {
log.Warnf("skipping adding a new route for network %s because it already exists", prefix)
return nil
}
ok, err = isSubRange(prefix)
if err != nil {
return err
}
if ok {
err := addRouteForCurrentDefaultGateway(prefix)
if err != nil {
log.Warnf("unable to add route for current default gateway route. Will proceed without it. error: %s", err)
}
}
return addToRouteTable(prefix, addr)
}
func addRouteForCurrentDefaultGateway(prefix netip.Prefix) error {
defaultGateway, err := getExistingRIBRouteGateway(netip.MustParsePrefix("0.0.0.0/0"))
if err != nil && err != errRouteNotFound {
return err
}
addr := netip.MustParseAddr(defaultGateway.String())
if !prefix.Contains(addr) {
log.Debugf("skipping adding a new route for gateway %s because it is not in the network %s", addr, prefix)
return nil
}
gatewayPrefix := netip.PrefixFrom(addr, 32)
ok, err := existsInRouteTable(gatewayPrefix)
if err != nil {
return fmt.Errorf("unable to check if there is an existing route for gateway %s. error: %s", gatewayPrefix, err)
}
if ok {
log.Debugf("skipping adding a new route for gateway %s because it already exists", gatewayPrefix)
return nil
}
gatewayHop, err := getExistingRIBRouteGateway(gatewayPrefix)
if err != nil && err != errRouteNotFound {
return fmt.Errorf("unable to get the next hop for the default gateway address. error: %s", err)
}
log.Debugf("adding a new route for gateway %s with next hop %s", gatewayPrefix, gatewayHop)
return addToRouteTable(gatewayPrefix, gatewayHop.String())
}
func existsInRouteTable(prefix netip.Prefix) (bool, error) {
routes, err := getRoutesFromTable()
if err != nil {
return false, err
}
for _, tableRoute := range routes {
if tableRoute == prefix {
return true, nil
}
}
return false, nil
}
func isSubRange(prefix netip.Prefix) (bool, error) {
routes, err := getRoutesFromTable()
if err != nil {
return false, err
}
for _, tableRoute := range routes {
if tableRoute.Bits() > minRangeBits && tableRoute.Contains(prefix.Addr()) && tableRoute.Bits() < prefix.Bits() {
return true, nil
}
}
return false, nil
}
func removeFromRouteTableIfNonSystem(prefix netip.Prefix, addr string) error {
return removeFromRouteTable(prefix, addr)
}
func getExistingRIBRouteGateway(prefix netip.Prefix) (net.IP, error) {
r, err := netroute.New()
if err != nil {
return nil, err
}
_, gateway, preferredSrc, err := r.Route(prefix.Addr().AsSlice())
if err != nil {
log.Errorf("getting routes returned an error: %v", err)
return nil, errRouteNotFound
}
if gateway == nil {
return preferredSrc, nil
}
return gateway, nil
}

38
client/internal/routemanager/systemops_nonlinux.go
View File

@ -1,41 +1,23 @@
//go:build !linux
// +build !linux
//go:build !linux && !ios
package routemanager
import (
"net/netip"
"os/exec"
"runtime"
log "github.com/sirupsen/logrus"
)
func addToRouteTable(prefix netip.Prefix, addr string) error {
cmd := exec.Command("route", "add", prefix.String(), addr)
out, err := cmd.Output()
if err != nil {
return err
}
log.Debugf(string(out))
return nil
}
func removeFromRouteTable(prefix netip.Prefix, addr string) error {
args := []string{"delete", prefix.String()}
if runtime.GOOS == "darwin" {
args = append(args, addr)
}
cmd := exec.Command("route", args...)
out, err := cmd.Output()
if err != nil {
return err
}
log.Debugf(string(out))
return nil
}
func enableIPForwarding() error {
log.Infof("enable IP forwarding is not implemented on %s", runtime.GOOS)
log.Infof("Enable IP forwarding is not implemented on %s", runtime.GOOS)
return nil
}
func addVPNRoute(prefix netip.Prefix, intf string) error {
return genericAddVPNRoute(prefix, intf)
}
func removeVPNRoute(prefix netip.Prefix, intf string) error {
return genericRemoveVPNRoute(prefix, intf)
}

212
client/internal/routemanager/systemops_nonandroid_test.go → client/internal/routemanager/systemops_test.go
View File

@ -1,24 +1,32 @@
//go:build !android
//go:build !android && !ios
package routemanager
import (
"bytes"
"context"
"fmt"
"net"
"net/netip"
"os"
"runtime"
"strings"
"testing"
"github.com/pion/transport/v3/stdnet"
log "github.com/sirupsen/logrus"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
"github.com/netbirdio/netbird/iface"
)
type dialer interface {
Dial(network, address string) (net.Conn, error)
DialContext(ctx context.Context, network, address string) (net.Conn, error)
}
func TestAddRemoveRoutes(t *testing.T) {
testCases := []struct {
name string
@ -53,27 +61,30 @@ func TestAddRemoveRoutes(t *testing.T) {
err = wgInterface.Create()
require.NoError(t, err, "should create testing wireguard interface")
_, _, err = setupRouting(nil, nil)
require.NoError(t, err)
t.Cleanup(func() {
assert.NoError(t, cleanupRouting())
})
err = addToRouteTableIfNoExists(testCase.prefix, wgInterface.Address().IP.String())
require.NoError(t, err, "addToRouteTableIfNoExists should not return err")
err = genericAddVPNRoute(testCase.prefix, wgInterface.Name())
require.NoError(t, err, "genericAddVPNRoute should not return err")
prefixGateway, err := getExistingRIBRouteGateway(testCase.prefix)
require.NoError(t, err, "getExistingRIBRouteGateway should not return err")
if testCase.shouldRouteToWireguard {
require.Equal(t, wgInterface.Address().IP.String(), prefixGateway.String(), "route should point to wireguard interface IP")
assertWGOutInterface(t, testCase.prefix, wgInterface, false)
} else {
require.NotEqual(t, wgInterface.Address().IP.String(), prefixGateway.String(), "route should point to a different interface")
assertWGOutInterface(t, testCase.prefix, wgInterface, true)
}
exists, err := existsInRouteTable(testCase.prefix)
require.NoError(t, err, "existsInRouteTable should not return err")
if exists && testCase.shouldRouteToWireguard {
err = removeFromRouteTableIfNonSystem(testCase.prefix, wgInterface.Address().IP.String())
require.NoError(t, err, "removeFromRouteTableIfNonSystem should not return err")
err = genericRemoveVPNRoute(testCase.prefix, wgInterface.Name())
require.NoError(t, err, "genericRemoveVPNRoute should not return err")
prefixGateway, err = getExistingRIBRouteGateway(testCase.prefix)
require.NoError(t, err, "getExistingRIBRouteGateway should not return err")
prefixGateway, _, err := getNextHop(testCase.prefix.Addr())
require.NoError(t, err, "getNextHop should not return err")
internetGateway, err := getExistingRIBRouteGateway(netip.MustParsePrefix("0.0.0.0/0"))
internetGateway, _, err := getNextHop(netip.MustParseAddr("0.0.0.0"))
require.NoError(t, err)
if testCase.shouldBeRemoved {
@ -86,12 +97,12 @@ func TestAddRemoveRoutes(t *testing.T) {
}
}
func TestGetExistingRIBRouteGateway(t *testing.T) {
gateway, err := getExistingRIBRouteGateway(netip.MustParsePrefix("0.0.0.0/0"))
func TestGetNextHop(t *testing.T) {
gateway, _, err := getNextHop(netip.MustParseAddr("0.0.0.0"))
if err != nil {
t.Fatal("shouldn't return error when fetching the gateway: ", err)
}
if gateway == nil {
if !gateway.IsValid() {
t.Fatal("should return a gateway")
}
addresses, err := net.InterfaceAddrs()
@ -113,11 +124,11 @@ func TestGetExistingRIBRouteGateway(t *testing.T) {
}
}
localIP, err := getExistingRIBRouteGateway(testingPrefix)
localIP, _, err := getNextHop(testingPrefix.Addr())
if err != nil {
t.Fatal("shouldn't return error: ", err)
}
if localIP == nil {
if !localIP.IsValid() {
t.Fatal("should return a gateway for local network")
}
if localIP.String() == gateway.String() {
@ -128,8 +139,8 @@ func TestGetExistingRIBRouteGateway(t *testing.T) {
}
}
func TestAddExistAndRemoveRouteNonAndroid(t *testing.T) {
defaultGateway, err := getExistingRIBRouteGateway(netip.MustParsePrefix("0.0.0.0/0"))
func TestAddExistAndRemoveRoute(t *testing.T) {
defaultGateway, _, err := getNextHop(netip.MustParseAddr("0.0.0.0"))
t.Log("defaultGateway: ", defaultGateway)
if err != nil {
t.Fatal("shouldn't return error when fetching the gateway: ", err)
@ -189,16 +200,14 @@ func TestAddExistAndRemoveRouteNonAndroid(t *testing.T) {
err = wgInterface.Create()
require.NoError(t, err, "should create testing wireguard interface")
MockAddr := wgInterface.Address().IP.String()
// Prepare the environment
if testCase.preExistingPrefix.IsValid() {
err := addToRouteTableIfNoExists(testCase.preExistingPrefix, MockAddr)
err := genericAddVPNRoute(testCase.preExistingPrefix, wgInterface.Name())
require.NoError(t, err, "should not return err when adding pre-existing route")
}
// Add the route
err = addToRouteTableIfNoExists(testCase.prefix, MockAddr)
err = genericAddVPNRoute(testCase.prefix, wgInterface.Name())
require.NoError(t, err, "should not return err when adding route")
if testCase.shouldAddRoute {
@ -208,7 +217,7 @@ func TestAddExistAndRemoveRouteNonAndroid(t *testing.T) {
require.True(t, ok, "route should exist")
// remove route again if added
err = removeFromRouteTableIfNonSystem(testCase.prefix, MockAddr)
err = genericRemoveVPNRoute(testCase.prefix, wgInterface.Name())
require.NoError(t, err, "should not return err")
}
@ -217,6 +226,7 @@ func TestAddExistAndRemoveRouteNonAndroid(t *testing.T) {
ok, err := existsInRouteTable(testCase.prefix)
t.Log("Buffer string: ", buf.String())
require.NoError(t, err, "should not return err")
if !strings.Contains(buf.String(), "because it already exists") {
require.False(t, ok, "route should not exist")
}
@ -224,31 +234,6 @@ func TestAddExistAndRemoveRouteNonAndroid(t *testing.T) {
}
}
func TestExistsInRouteTable(t *testing.T) {
addresses, err := net.InterfaceAddrs()
if err != nil {
t.Fatal("shouldn't return error when fetching interface addresses: ", err)
}
var addressPrefixes []netip.Prefix
for _, address := range addresses {
p := netip.MustParsePrefix(address.String())
if p.Addr().Is4() {
addressPrefixes = append(addressPrefixes, p.Masked())
}
}
for _, prefix := range addressPrefixes {
exists, err := existsInRouteTable(prefix)
if err != nil {
t.Fatal("shouldn't return error when checking if address exists in route table: ", err)
}
if !exists {
t.Fatalf("address %s should exist in route table", prefix)
}
}
}
func TestIsSubRange(t *testing.T) {
addresses, err := net.InterfaceAddrs()
if err != nil {
@ -286,3 +271,132 @@ func TestIsSubRange(t *testing.T) {
}
}
}
func TestExistsInRouteTable(t *testing.T) {
addresses, err := net.InterfaceAddrs()
if err != nil {
t.Fatal("shouldn't return error when fetching interface addresses: ", err)
}
var addressPrefixes []netip.Prefix
for _, address := range addresses {
p := netip.MustParsePrefix(address.String())
if p.Addr().Is6() {
continue
}
// Windows sometimes has hidden interface link local addrs that don't turn up on any interface
if runtime.GOOS == "windows" && p.Addr().IsLinkLocalUnicast() {
continue
}
// Linux loopback 127/8 is in the local table, not in the main table and always takes precedence
if runtime.GOOS == "linux" && p.Addr().IsLoopback() {
continue
}
addressPrefixes = append(addressPrefixes, p.Masked())
}
for _, prefix := range addressPrefixes {
exists, err := existsInRouteTable(prefix)
if err != nil {
t.Fatal("shouldn't return error when checking if address exists in route table: ", err)
}
if !exists {
t.Fatalf("address %s should exist in route table", prefix)
}
}
}
func createWGInterface(t *testing.T, interfaceName, ipAddressCIDR string, listenPort int) *iface.WGIface {
t.Helper()
peerPrivateKey, err := wgtypes.GeneratePrivateKey()
require.NoError(t, err)
newNet, err := stdnet.NewNet()
require.NoError(t, err)
wgInterface, err := iface.NewWGIFace(interfaceName, ipAddressCIDR, listenPort, peerPrivateKey.String(), iface.DefaultMTU, newNet, nil)
require.NoError(t, err, "should create testing WireGuard interface")
err = wgInterface.Create()
require.NoError(t, err, "should create testing WireGuard interface")
t.Cleanup(func() {
wgInterface.Close()
})
return wgInterface
}
func setupTestEnv(t *testing.T) {
t.Helper()
setupDummyInterfacesAndRoutes(t)
wgIface := createWGInterface(t, expectedVPNint, "100.64.0.1/24", 51820)
t.Cleanup(func() {
assert.NoError(t, wgIface.Close())
})
_, _, err := setupRouting(nil, wgIface)
require.NoError(t, err, "setupRouting should not return err")
t.Cleanup(func() {
assert.NoError(t, cleanupRouting())
})
// default route exists in main table and vpn table
err = addVPNRoute(netip.MustParsePrefix("0.0.0.0/0"), wgIface.Name())
require.NoError(t, err, "addVPNRoute should not return err")
t.Cleanup(func() {
err = removeVPNRoute(netip.MustParsePrefix("0.0.0.0/0"), wgIface.Name())
assert.NoError(t, err, "removeVPNRoute should not return err")
})
// 10.0.0.0/8 route exists in main table and vpn table
err = addVPNRoute(netip.MustParsePrefix("10.0.0.0/8"), wgIface.Name())
require.NoError(t, err, "addVPNRoute should not return err")
t.Cleanup(func() {
err = removeVPNRoute(netip.MustParsePrefix("10.0.0.0/8"), wgIface.Name())
assert.NoError(t, err, "removeVPNRoute should not return err")
})
// 10.10.0.0/24 more specific route exists in vpn table
err = addVPNRoute(netip.MustParsePrefix("10.10.0.0/24"), wgIface.Name())
require.NoError(t, err, "addVPNRoute should not return err")
t.Cleanup(func() {
err = removeVPNRoute(netip.MustParsePrefix("10.10.0.0/24"), wgIface.Name())
assert.NoError(t, err, "removeVPNRoute should not return err")
})
// 127.0.10.0/24 more specific route exists in vpn table
err = addVPNRoute(netip.MustParsePrefix("127.0.10.0/24"), wgIface.Name())
require.NoError(t, err, "addVPNRoute should not return err")
t.Cleanup(func() {
err = removeVPNRoute(netip.MustParsePrefix("127.0.10.0/24"), wgIface.Name())
assert.NoError(t, err, "removeVPNRoute should not return err")
})
// unique route in vpn table
err = addVPNRoute(netip.MustParsePrefix("172.16.0.0/12"), wgIface.Name())
require.NoError(t, err, "addVPNRoute should not return err")
t.Cleanup(func() {
err = removeVPNRoute(netip.MustParsePrefix("172.16.0.0/12"), wgIface.Name())
assert.NoError(t, err, "removeVPNRoute should not return err")
})
}
func assertWGOutInterface(t *testing.T, prefix netip.Prefix, wgIface *iface.WGIface, invert bool) {
t.Helper()
if runtime.GOOS == "linux" && prefix.Addr().IsLoopback() {
return
}
prefixGateway, _, err := getNextHop(prefix.Addr())
require.NoError(t, err, "getNextHop should not return err")
if invert {
assert.NotEqual(t, wgIface.Address().IP.String(), prefixGateway.String(), "route should not point to wireguard interface IP")
} else {
assert.Equal(t, wgIface.Address().IP.String(), prefixGateway.String(), "route should point to wireguard interface IP")
}
}

234
client/internal/routemanager/systemops_unix_test.go Normal file
View File

@ -0,0 +1,234 @@
//go:build (linux && !android) || (darwin && !ios) || freebsd || openbsd || netbsd || dragonfly
package routemanager
import (
"fmt"
"net"
"strings"
"testing"
"time"
"github.com/gopacket/gopacket"
"github.com/gopacket/gopacket/layers"
"github.com/gopacket/gopacket/pcap"
"github.com/miekg/dns"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
nbnet "github.com/netbirdio/netbird/util/net"
)
type PacketExpectation struct {
SrcIP net.IP
DstIP net.IP
SrcPort int
DstPort int
UDP bool
TCP bool
}
type testCase struct {
name string
destination string
expectedInterface string
dialer dialer
expectedPacket PacketExpectation
}
var testCases = []testCase{
{
name: "To external host without custom dialer via vpn",
destination: "192.0.2.1:53",
expectedInterface: expectedVPNint,
dialer: &net.Dialer{},
expectedPacket: createPacketExpectation("100.64.0.1", 12345, "192.0.2.1", 53),
},
{
name: "To external host with custom dialer via physical interface",
destination: "192.0.2.1:53",
expectedInterface: expectedExternalInt,
dialer: nbnet.NewDialer(),
expectedPacket: createPacketExpectation("192.168.0.1", 12345, "192.0.2.1", 53),
},
{
name: "To duplicate internal route with custom dialer via physical interface",
destination: "10.0.0.2:53",
expectedInterface: expectedInternalInt,
dialer: nbnet.NewDialer(),
expectedPacket: createPacketExpectation("192.168.1.1", 12345, "10.0.0.2", 53),
},
{
name: "To duplicate internal route without custom dialer via physical interface", // local route takes precedence
destination: "10.0.0.2:53",
expectedInterface: expectedInternalInt,
dialer: &net.Dialer{},
expectedPacket: createPacketExpectation("192.168.1.1", 12345, "10.0.0.2", 53),
},
{
name: "To unique vpn route with custom dialer via physical interface",
destination: "172.16.0.2:53",
expectedInterface: expectedExternalInt,
dialer: nbnet.NewDialer(),
expectedPacket: createPacketExpectation("192.168.0.1", 12345, "172.16.0.2", 53),
},
{
name: "To unique vpn route without custom dialer via vpn",
destination: "172.16.0.2:53",
expectedInterface: expectedVPNint,
dialer: &net.Dialer{},
expectedPacket: createPacketExpectation("100.64.0.1", 12345, "172.16.0.2", 53),
},
}
func TestRouting(t *testing.T) {
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
setupTestEnv(t)
filter := createBPFFilter(tc.destination)
handle := startPacketCapture(t, tc.expectedInterface, filter)
sendTestPacket(t, tc.destination, tc.expectedPacket.SrcPort, tc.dialer)
packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
packet, err := packetSource.NextPacket()
require.NoError(t, err)
verifyPacket(t, packet, tc.expectedPacket)
})
}
}
func createPacketExpectation(srcIP string, srcPort int, dstIP string, dstPort int) PacketExpectation {
return PacketExpectation{
SrcIP: net.ParseIP(srcIP),
DstIP: net.ParseIP(dstIP),
SrcPort: srcPort,
DstPort: dstPort,
UDP: true,
}
}
func startPacketCapture(t *testing.T, intf, filter string) *pcap.Handle {
t.Helper()
inactive, err := pcap.NewInactiveHandle(intf)
require.NoError(t, err, "Failed to create inactive pcap handle")
defer inactive.CleanUp()
err = inactive.SetSnapLen(1600)
require.NoError(t, err, "Failed to set snap length on inactive handle")
err = inactive.SetTimeout(time.Second * 10)
require.NoError(t, err, "Failed to set timeout on inactive handle")
err = inactive.SetImmediateMode(true)
require.NoError(t, err, "Failed to set immediate mode on inactive handle")
handle, err := inactive.Activate()
require.NoError(t, err, "Failed to activate pcap handle")
t.Cleanup(handle.Close)
err = handle.SetBPFFilter(filter)
require.NoError(t, err, "Failed to set BPF filter")
return handle
}
func sendTestPacket(t *testing.T, destination string, sourcePort int, dialer dialer) {
t.Helper()
if dialer == nil {
dialer = &net.Dialer{}
}
if sourcePort != 0 {
localUDPAddr := &net.UDPAddr{
IP: net.IPv4zero,
Port: sourcePort,
}
switch dialer := dialer.(type) {
case *nbnet.Dialer:
dialer.LocalAddr = localUDPAddr
case *net.Dialer:
dialer.LocalAddr = localUDPAddr
default:
t.Fatal("Unsupported dialer type")
}
}
msg := new(dns.Msg)
msg.Id = dns.Id()
msg.RecursionDesired = true
msg.Question = []dns.Question{
{Name: "example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
}
conn, err := dialer.Dial("udp", destination)
require.NoError(t, err, "Failed to dial UDP")
defer conn.Close()
data, err := msg.Pack()
require.NoError(t, err, "Failed to pack DNS message")
_, err = conn.Write(data)
if err != nil {
if strings.Contains(err.Error(), "required key not available") {
t.Logf("Ignoring WireGuard key error: %v", err)
return
}
t.Fatalf("Failed to send DNS query: %v", err)
}
}
func createBPFFilter(destination string) string {
host, port, err := net.SplitHostPort(destination)
if err != nil {
return fmt.Sprintf("udp and dst host %s and dst port %s", host, port)
}
return "udp"
}
func verifyPacket(t *testing.T, packet gopacket.Packet, exp PacketExpectation) {
t.Helper()
ipLayer := packet.Layer(layers.LayerTypeIPv4)
require.NotNil(t, ipLayer, "Expected IPv4 layer not found in packet")
ip, ok := ipLayer.(*layers.IPv4)
require.True(t, ok, "Failed to cast to IPv4 layer")
// Convert both source and destination IP addresses to 16-byte representation
expectedSrcIP := exp.SrcIP.To16()
actualSrcIP := ip.SrcIP.To16()
assert.Equal(t, expectedSrcIP, actualSrcIP, "Source IP mismatch")
expectedDstIP := exp.DstIP.To16()
actualDstIP := ip.DstIP.To16()
assert.Equal(t, expectedDstIP, actualDstIP, "Destination IP mismatch")
if exp.UDP {
udpLayer := packet.Layer(layers.LayerTypeUDP)
require.NotNil(t, udpLayer, "Expected UDP layer not found in packet")
udp, ok := udpLayer.(*layers.UDP)
require.True(t, ok, "Failed to cast to UDP layer")
assert.Equal(t, layers.UDPPort(exp.SrcPort), udp.SrcPort, "UDP source port mismatch")
assert.Equal(t, layers.UDPPort(exp.DstPort), udp.DstPort, "UDP destination port mismatch")
}
if exp.TCP {
tcpLayer := packet.Layer(layers.LayerTypeTCP)
require.NotNil(t, tcpLayer, "Expected TCP layer not found in packet")
tcp, ok := tcpLayer.(*layers.TCP)
require.True(t, ok, "Failed to cast to TCP layer")
assert.Equal(t, layers.TCPPort(exp.SrcPort), tcp.SrcPort, "TCP source port mismatch")
assert.Equal(t, layers.TCPPort(exp.DstPort), tcp.DstPort, "TCP destination port mismatch")
}
}

88
client/internal/routemanager/systemops_windows.go
View File

@ -1,13 +1,19 @@
//go:build windows
// +build windows
package routemanager
import (
"fmt"
"net"
"net/netip"
"os/exec"
"strings"
log "github.com/sirupsen/logrus"
"github.com/yusufpapurcu/wmi"
"github.com/netbirdio/netbird/client/internal/peer"
"github.com/netbirdio/netbird/iface"
)
type Win32_IP4RouteTable struct {
@ -15,23 +21,35 @@ type Win32_IP4RouteTable struct {
Mask string
}
var routeManager *RouteManager
func setupRouting(initAddresses []net.IP, wgIface *iface.WGIface) (peer.BeforeAddPeerHookFunc, peer.AfterRemovePeerHookFunc, error) {
return setupRoutingWithRouteManager(&routeManager, initAddresses, wgIface)
}
func cleanupRouting() error {
return cleanupRoutingWithRouteManager(routeManager)
}
func getRoutesFromTable() ([]netip.Prefix, error) {
var routes []Win32_IP4RouteTable
query := "SELECT Destination, Mask FROM Win32_IP4RouteTable"
err := wmi.Query(query, &routes)
if err != nil {
return nil, err
return nil, fmt.Errorf("get routes: %w", err)
}
var prefixList []netip.Prefix
for _, route := range routes {
addr, err := netip.ParseAddr(route.Destination)
if err != nil {
log.Warnf("Unable to parse route destination %s: %v", route.Destination, err)
continue
}
maskSlice := net.ParseIP(route.Mask).To4()
if maskSlice == nil {
log.Warnf("Unable to parse route mask %s", route.Mask)
continue
}
mask := net.IPv4Mask(maskSlice[0], maskSlice[1], maskSlice[2], maskSlice[3])
@ -44,3 +62,69 @@ func getRoutesFromTable() ([]netip.Prefix, error) {
}
return prefixList, nil
}
func addRoutePowershell(prefix netip.Prefix, nexthop netip.Addr, intf string) error {
destinationPrefix := prefix.String()
psCmd := "New-NetRoute"
addressFamily := "IPv4"
if prefix.Addr().Is6() {
addressFamily = "IPv6"
}
script := fmt.Sprintf(
`%s -AddressFamily "%s" -DestinationPrefix "%s" -InterfaceAlias "%s" -Confirm:$False -ErrorAction Stop`,
psCmd, addressFamily, destinationPrefix, intf,
)
if nexthop.IsValid() {
script = fmt.Sprintf(
`%s -NextHop "%s"`, script, nexthop,
)
}
out, err := exec.Command("powershell", "-Command", script).CombinedOutput()
log.Tracef("PowerShell add route: %s", string(out))
if err != nil {
return fmt.Errorf("PowerShell add route: %w", err)
}
return nil
}
func addRouteCmd(prefix netip.Prefix, nexthop netip.Addr, _ string) error {
args := []string{"add", prefix.String(), nexthop.Unmap().String()}
out, err := exec.Command("route", args...).CombinedOutput()
log.Tracef("route %s output: %s", strings.Join(args, " "), out)
if err != nil {
return fmt.Errorf("route add: %w", err)
}
return nil
}
func addToRouteTable(prefix netip.Prefix, nexthop netip.Addr, intf string) error {
// Powershell doesn't support adding routes without an interface but allows to add interface by name
if intf != "" {
return addRoutePowershell(prefix, nexthop, intf)
}
return addRouteCmd(prefix, nexthop, intf)
}
func removeFromRouteTable(prefix netip.Prefix, nexthop netip.Addr, _ string) error {
args := []string{"delete", prefix.String()}
if nexthop.IsValid() {
args = append(args, nexthop.Unmap().String())
}
out, err := exec.Command("route", args...).CombinedOutput()
log.Tracef("route %s output: %s", strings.Join(args, " "), out)
if err != nil {
return fmt.Errorf("remove route: %w", err)
}
return nil
}

289
client/internal/routemanager/systemops_windows_test.go Normal file
View File

@ -0,0 +1,289 @@
package routemanager
import (
"context"
"encoding/json"
"fmt"
"net"
"os/exec"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
nbnet "github.com/netbirdio/netbird/util/net"
)
var expectedExtInt = "Ethernet1"
type RouteInfo struct {
NextHop string `json:"nexthop"`
InterfaceAlias string `json:"interfacealias"`
RouteMetric int `json:"routemetric"`
}
type FindNetRouteOutput struct {
IPAddress string `json:"IPAddress"`
InterfaceIndex int `json:"InterfaceIndex"`
InterfaceAlias string `json:"InterfaceAlias"`
AddressFamily int `json:"AddressFamily"`
NextHop string `json:"NextHop"`
DestinationPrefix string `json:"DestinationPrefix"`
}
type testCase struct {
name string
destination string
expectedSourceIP string
expectedDestPrefix string
expectedNextHop string
expectedInterface string
dialer dialer
}
var expectedVPNint = "wgtest0"
var testCases = []testCase{
{
name: "To external host without custom dialer via vpn",
destination: "192.0.2.1:53",
expectedSourceIP: "100.64.0.1",
expectedDestPrefix: "128.0.0.0/1",
expectedNextHop: "0.0.0.0",
expectedInterface: "wgtest0",
dialer: &net.Dialer{},
},
{
name: "To external host with custom dialer via physical interface",
destination: "192.0.2.1:53",
expectedDestPrefix: "192.0.2.1/32",
expectedInterface: expectedExtInt,
dialer: nbnet.NewDialer(),
},
{
name: "To duplicate internal route with custom dialer via physical interface",
destination: "10.0.0.2:53",
expectedDestPrefix: "10.0.0.2/32",
expectedInterface: expectedExtInt,
dialer: nbnet.NewDialer(),
},
{
name: "To duplicate internal route without custom dialer via physical interface", // local route takes precedence
destination: "10.0.0.2:53",
expectedSourceIP: "10.0.0.1",
expectedDestPrefix: "10.0.0.0/8",
expectedNextHop: "0.0.0.0",
expectedInterface: "Loopback Pseudo-Interface 1",
dialer: &net.Dialer{},
},
{
name: "To unique vpn route with custom dialer via physical interface",
destination: "172.16.0.2:53",
expectedDestPrefix: "172.16.0.2/32",
expectedInterface: expectedExtInt,
dialer: nbnet.NewDialer(),
},
{
name: "To unique vpn route without custom dialer via vpn",
destination: "172.16.0.2:53",
expectedSourceIP: "100.64.0.1",
expectedDestPrefix: "172.16.0.0/12",
expectedNextHop: "0.0.0.0",
expectedInterface: "wgtest0",
dialer: &net.Dialer{},
},
{
name: "To more specific route without custom dialer via vpn interface",
destination: "10.10.0.2:53",
expectedSourceIP: "100.64.0.1",
expectedDestPrefix: "10.10.0.0/24",
expectedNextHop: "0.0.0.0",
expectedInterface: "wgtest0",
dialer: &net.Dialer{},
},
{
name: "To more specific route (local) without custom dialer via physical interface",
destination: "127.0.10.2:53",
expectedSourceIP: "10.0.0.1",
expectedDestPrefix: "127.0.0.0/8",
expectedNextHop: "0.0.0.0",
expectedInterface: "Loopback Pseudo-Interface 1",
dialer: &net.Dialer{},
},
}
func TestRouting(t *testing.T) {
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
setupTestEnv(t)
route, err := fetchOriginalGateway()
require.NoError(t, err, "Failed to fetch original gateway")
ip, err := fetchInterfaceIP(route.InterfaceAlias)
require.NoError(t, err, "Failed to fetch interface IP")
output := testRoute(t, tc.destination, tc.dialer)
if tc.expectedInterface == expectedExtInt {
verifyOutput(t, output, ip, tc.expectedDestPrefix, route.NextHop, route.InterfaceAlias)
} else {
verifyOutput(t, output, tc.expectedSourceIP, tc.expectedDestPrefix, tc.expectedNextHop, tc.expectedInterface)
}
})
}
}
// fetchInterfaceIP fetches the IPv4 address of the specified interface.
func fetchInterfaceIP(interfaceAlias string) (string, error) {
script := fmt.Sprintf(`Get-NetIPAddress -InterfaceAlias "%s" | Where-Object AddressFamily -eq 2 | Select-Object -ExpandProperty IPAddress`, interfaceAlias)
out, err := exec.Command("powershell", "-Command", script).Output()
if err != nil {
return "", fmt.Errorf("failed to execute Get-NetIPAddress: %w", err)
}
ip := strings.TrimSpace(string(out))
return ip, nil
}
func testRoute(t *testing.T, destination string, dialer dialer) *FindNetRouteOutput {
t.Helper()
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
conn, err := dialer.DialContext(ctx, "udp", destination)
require.NoError(t, err, "Failed to dial destination")
defer func() {
err := conn.Close()
assert.NoError(t, err, "Failed to close connection")
}()
host, _, err := net.SplitHostPort(destination)
require.NoError(t, err)
script := fmt.Sprintf(`Find-NetRoute -RemoteIPAddress "%s" | Select-Object -Property IPAddress, InterfaceIndex, InterfaceAlias, AddressFamily, NextHop, DestinationPrefix | ConvertTo-Json`, host)
out, err := exec.Command("powershell", "-Command", script).Output()
require.NoError(t, err, "Failed to execute Find-NetRoute")
var outputs []FindNetRouteOutput
err = json.Unmarshal(out, &outputs)
require.NoError(t, err, "Failed to parse JSON outputs from Find-NetRoute")
require.Greater(t, len(outputs), 0, "No route found for destination")
combinedOutput := combineOutputs(outputs)
return combinedOutput
}
func createAndSetupDummyInterface(t *testing.T, interfaceName, ipAddressCIDR string) string {
t.Helper()
ip, ipNet, err := net.ParseCIDR(ipAddressCIDR)
require.NoError(t, err)
subnetMaskSize, _ := ipNet.Mask.Size()
script := fmt.Sprintf(`New-NetIPAddress -InterfaceAlias "%s" -IPAddress "%s" -PrefixLength %d -PolicyStore ActiveStore -Confirm:$False`, interfaceName, ip.String(), subnetMaskSize)
_, err = exec.Command("powershell", "-Command", script).CombinedOutput()
require.NoError(t, err, "Failed to assign IP address to loopback adapter")
// Wait for the IP address to be applied
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
err = waitForIPAddress(ctx, interfaceName, ip.String())
require.NoError(t, err, "IP address not applied within timeout")
t.Cleanup(func() {
script = fmt.Sprintf(`Remove-NetIPAddress -InterfaceAlias "%s" -IPAddress "%s" -Confirm:$False`, interfaceName, ip.String())
_, err = exec.Command("powershell", "-Command", script).CombinedOutput()
require.NoError(t, err, "Failed to remove IP address from loopback adapter")
})
return interfaceName
}
func fetchOriginalGateway() (*RouteInfo, error) {
cmd := exec.Command("powershell", "-Command", "Get-NetRoute -DestinationPrefix 0.0.0.0/0 | Select-Object NextHop, RouteMetric, InterfaceAlias | ConvertTo-Json")
output, err := cmd.CombinedOutput()
if err != nil {
return nil, fmt.Errorf("failed to execute Get-NetRoute: %w", err)
}
var routeInfo RouteInfo
err = json.Unmarshal(output, &routeInfo)
if err != nil {
return nil, fmt.Errorf("failed to parse JSON output: %w", err)
}
return &routeInfo, nil
}
func verifyOutput(t *testing.T, output *FindNetRouteOutput, sourceIP, destPrefix, nextHop, intf string) {
t.Helper()
assert.Equal(t, sourceIP, output.IPAddress, "Source IP mismatch")
assert.Equal(t, destPrefix, output.DestinationPrefix, "Destination prefix mismatch")
assert.Equal(t, nextHop, output.NextHop, "Next hop mismatch")
assert.Equal(t, intf, output.InterfaceAlias, "Interface mismatch")
}
func waitForIPAddress(ctx context.Context, interfaceAlias, expectedIPAddress string) error {
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-ticker.C:
out, err := exec.Command("powershell", "-Command", fmt.Sprintf(`Get-NetIPAddress -InterfaceAlias "%s" | Select-Object -ExpandProperty IPAddress`, interfaceAlias)).CombinedOutput()
if err != nil {
return err
}
ipAddresses := strings.Split(strings.TrimSpace(string(out)), "\n")
for _, ip := range ipAddresses {
if strings.TrimSpace(ip) == expectedIPAddress {
return nil
}
}
}
}
}
func combineOutputs(outputs []FindNetRouteOutput) *FindNetRouteOutput {
var combined FindNetRouteOutput
for _, output := range outputs {
if output.IPAddress != "" {
combined.IPAddress = output.IPAddress
}
if output.InterfaceIndex != 0 {
combined.InterfaceIndex = output.InterfaceIndex
}
if output.InterfaceAlias != "" {
combined.InterfaceAlias = output.InterfaceAlias
}
if output.AddressFamily != 0 {
combined.AddressFamily = output.AddressFamily
}
if output.NextHop != "" {
combined.NextHop = output.NextHop
}
if output.DestinationPrefix != "" {
combined.DestinationPrefix = output.DestinationPrefix
}
}
return &combined
}
func setupDummyInterfacesAndRoutes(t *testing.T) {
t.Helper()
createAndSetupDummyInterface(t, "Loopback Pseudo-Interface 1", "10.0.0.1/8")
}

24
client/internal/stdnet/dialer.go Normal file
View File

@ -0,0 +1,24 @@
package stdnet
import (
"net"
"github.com/pion/transport/v3"
nbnet "github.com/netbirdio/netbird/util/net"
)
// Dial connects to the address on the named network.
func (n *Net) Dial(network, address string) (net.Conn, error) {
return nbnet.NewDialer().Dial(network, address)
}
// DialUDP connects to the address on the named UDP network.
func (n *Net) DialUDP(network string, laddr, raddr *net.UDPAddr) (transport.UDPConn, error) {
return nbnet.DialUDP(network, laddr, raddr)
}
// DialTCP connects to the address on the named TCP network.
func (n *Net) DialTCP(network string, laddr, raddr *net.TCPAddr) (transport.TCPConn, error) {
return nbnet.DialTCP(network, laddr, raddr)
}

20
client/internal/stdnet/listener.go Normal file
View File

@ -0,0 +1,20 @@
package stdnet
import (
"context"
"net"
"github.com/pion/transport/v3"
nbnet "github.com/netbirdio/netbird/util/net"
)
// ListenPacket listens for incoming packets on the given network and address.
func (n *Net) ListenPacket(network, address string) (net.PacketConn, error) {
return nbnet.NewListener().ListenPacket(context.Background(), network, address)
}
// ListenUDP acts like ListenPacket for UDP networks.
func (n *Net) ListenUDP(network string, locAddr *net.UDPAddr) (transport.UDPConn, error) {
return nbnet.ListenUDP(network, locAddr)
}

9
client/internal/wgproxy/proxy_ebpf.go
View File

@ -17,6 +17,7 @@ import (
"github.com/netbirdio/netbird/client/internal/ebpf"
ebpfMgr "github.com/netbirdio/netbird/client/internal/ebpf/manager"
nbnet "github.com/netbirdio/netbird/util/net"
)
// WGEBPFProxy definition for proxy with EBPF support
@ -67,7 +68,7 @@ func (p *WGEBPFProxy) Listen() error {
IP: net.ParseIP("127.0.0.1"),
}
conn, err := net.ListenUDP("udp", &addr)
conn, err := nbnet.ListenUDP("udp", &addr)
if err != nil {
cErr := p.Free()
if cErr != nil {
@ -228,6 +229,12 @@ func (p *WGEBPFProxy) prepareSenderRawSocket() (net.PacketConn, error) {
return nil, fmt.Errorf("binding to lo interface failed: %w", err)
}
// Set the fwmark on the socket.
err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_MARK, nbnet.NetbirdFwmark)
if err != nil {
return nil, fmt.Errorf("setting fwmark failed: %w", err)
}
// Convert the file descriptor to a PacketConn.
file := os.NewFile(uintptr(fd), fmt.Sprintf("fd %d", fd))
if file == nil {

4
client/internal/wgproxy/proxy_userspace.go
View File

@ -6,6 +6,8 @@ import (
"net"
log "github.com/sirupsen/logrus"
nbnet "github.com/netbirdio/netbird/util/net"
)
// WGUserSpaceProxy proxies
@ -33,7 +35,7 @@ func (p *WGUserSpaceProxy) AddTurnConn(remoteConn net.Conn) (net.Addr, error) {
p.remoteConn = remoteConn
var err error
p.localConn, err = net.Dial("udp", fmt.Sprintf(":%d", p.localWGListenPort))
p.localConn, err = nbnet.NewDialer().Dial("udp", fmt.Sprintf(":%d", p.localWGListenPort))
if err != nil {
log.Errorf("failed dialing to local Wireguard port %s", err)
return nil, err

2
go.mod
View File

@ -48,6 +48,7 @@ require (
github.com/google/gopacket v1.1.19
github.com/google/martian/v3 v3.0.0
github.com/google/nftables v0.0.0-20220808154552-2eca00135732
github.com/gopacket/gopacket v1.1.1
github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.0.2-0.20240212192251-757544f21357
github.com/hashicorp/go-multierror v1.1.1
github.com/hashicorp/go-secure-stdlib/base62 v0.1.2
@ -123,7 +124,6 @@ require (
github.com/google/s2a-go v0.1.4 // indirect
github.com/googleapis/enterprise-certificate-proxy v0.2.3 // indirect
github.com/googleapis/gax-go/v2 v2.10.0 // indirect
github.com/gopacket/gopacket v1.1.1 // indirect
github.com/hashicorp/errwrap v1.0.0 // indirect
github.com/hashicorp/go-uuid v1.0.2 // indirect
github.com/inconshreveable/mousetrap v1.1.0 // indirect

4
iface/wg_configurer_kernel.go
View File

@ -10,6 +10,8 @@ import (
log "github.com/sirupsen/logrus"
"golang.zx2c4.com/wireguard/wgctrl"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
nbnet "github.com/netbirdio/netbird/util/net"
)
type wgKernelConfigurer struct {
@ -29,7 +31,7 @@ func (c *wgKernelConfigurer) configureInterface(privateKey string, port int) err
if err != nil {
return err
}
fwmark := 0
fwmark := nbnet.NetbirdFwmark
config := wgtypes.Config{
PrivateKey: &key,
ReplacePeers: true,

11
iface/wg_configurer_usp.go
View File

@ -13,6 +13,8 @@ import (
log "github.com/sirupsen/logrus"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
nbnet "github.com/netbirdio/netbird/util/net"
)
type wgUSPConfigurer struct {
@ -37,7 +39,7 @@ func (c *wgUSPConfigurer) configureInterface(privateKey string, port int) error
if err != nil {
return err
}
fwmark := 0
fwmark := getFwmark()
config := wgtypes.Config{
PrivateKey: &key,
ReplacePeers: true,
@ -345,3 +347,10 @@ func toWgUserspaceString(wgCfg wgtypes.Config) string {
}
return sb.String()
}
func getFwmark() int {
if runtime.GOOS == "linux" {
return nbnet.NetbirdFwmark
}
return 0
}

2
management/client/grpc.go
View File

@ -24,6 +24,7 @@ import (
"github.com/netbirdio/netbird/client/system"
"github.com/netbirdio/netbird/encryption"
"github.com/netbirdio/netbird/management/proto"
nbgrpc "github.com/netbirdio/netbird/util/grpc"
)
const ConnectTimeout = 10 * time.Second
@ -57,6 +58,7 @@ func NewClient(ctx context.Context, addr string, ourPrivateKey wgtypes.Key, tlsE
mgmCtx,
addr,
transportOption,
nbgrpc.WithCustomDialer(),
grpc.WithBlock(),
grpc.WithKeepaliveParams(keepalive.ClientParameters{
Time: 30 * time.Second,

10
sharedsock/sock_linux.go
View File

@ -21,6 +21,8 @@ import (
log "github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"golang.org/x/sys/unix"
nbnet "github.com/netbirdio/netbird/util/net"
)
// ErrSharedSockStopped indicates that shared socket has been stopped
@ -82,10 +84,18 @@ func Listen(port int, filter BPFFilter) (_ net.PacketConn, err error) {
return nil, fmt.Errorf("failed to create ipv4 raw socket: %w", err)
}
if err = nbnet.SetSocketMark(rawSock.conn4); err != nil {
return nil, fmt.Errorf("failed to set SO_MARK on ipv4 socket: %w", err)
}
var sockErr error
rawSock.conn6, sockErr = socket.Socket(unix.AF_INET6, unix.SOCK_RAW, unix.IPPROTO_UDP, "raw_udp6", nil)
if sockErr != nil {
log.Errorf("Failed to create ipv6 raw socket: %v", err)
} else {
if err = nbnet.SetSocketMark(rawSock.conn6); err != nil {
return nil, fmt.Errorf("failed to set SO_MARK on ipv6 socket: %w", err)
}
}
ipv4Instructions, ipv6Instructions, err := filter.GetInstructions(uint32(rawSock.port))

2
signal/client/grpc.go
View File

@ -23,6 +23,7 @@ import (
"github.com/netbirdio/netbird/encryption"
"github.com/netbirdio/netbird/management/client"
"github.com/netbirdio/netbird/signal/proto"
nbgrpc "github.com/netbirdio/netbird/util/grpc"
)
// ConnStateNotifier is a wrapper interface of the status recorder
@ -76,6 +77,7 @@ func NewClient(ctx context.Context, addr string, key wgtypes.Key, tlsEnabled boo
sigCtx,
addr,
transportOption,
nbgrpc.WithCustomDialer(),
grpc.WithBlock(),
grpc.WithKeepaliveParams(keepalive.ClientParameters{
Time: 30 * time.Second,

22
util/grpc/dialer.go Normal file
View File

@ -0,0 +1,22 @@
package grpc
import (
"context"
"net"
log "github.com/sirupsen/logrus"
"google.golang.org/grpc"
nbnet "github.com/netbirdio/netbird/util/net"
)
func WithCustomDialer() grpc.DialOption {
return grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
conn, err := nbnet.NewDialer().DialContext(ctx, "tcp", addr)
if err != nil {
log.Errorf("Failed to dial: %s", err)
return nil, err
}
return conn, nil
})
}

21
util/net/dialer.go Normal file
View File

@ -0,0 +1,21 @@
package net
import (
"net"
)
// Dialer extends the standard net.Dialer with the ability to execute hooks before
// and after connections. This can be used to bypass the VPN for connections using this dialer.
type Dialer struct {
*net.Dialer
}
// NewDialer returns a customized net.Dialer with overridden Control method
func NewDialer() *Dialer {
dialer := &Dialer{
Dialer: &net.Dialer{},
}
dialer.init()
return dialer
}

163
util/net/dialer_generic.go Normal file
View File

@ -0,0 +1,163 @@
//go:build !android && !ios
package net
import (
"context"
"fmt"
"net"
"sync"
"github.com/hashicorp/go-multierror"
log "github.com/sirupsen/logrus"
)
type DialerDialHookFunc func(ctx context.Context, connID ConnectionID, resolvedAddresses []net.IPAddr) error
type DialerCloseHookFunc func(connID ConnectionID, conn *net.Conn) error
var (
dialerDialHooksMutex sync.RWMutex
dialerDialHooks []DialerDialHookFunc
dialerCloseHooksMutex sync.RWMutex
dialerCloseHooks []DialerCloseHookFunc
)
// AddDialerHook allows adding a new hook to be executed before dialing.
func AddDialerHook(hook DialerDialHookFunc) {
dialerDialHooksMutex.Lock()
defer dialerDialHooksMutex.Unlock()
dialerDialHooks = append(dialerDialHooks, hook)
}
// AddDialerCloseHook allows adding a new hook to be executed on connection close.
func AddDialerCloseHook(hook DialerCloseHookFunc) {
dialerCloseHooksMutex.Lock()
defer dialerCloseHooksMutex.Unlock()
dialerCloseHooks = append(dialerCloseHooks, hook)
}
// RemoveDialerHook removes all dialer hooks.
func RemoveDialerHooks() {
dialerDialHooksMutex.Lock()
defer dialerDialHooksMutex.Unlock()
dialerDialHooks = nil
dialerCloseHooksMutex.Lock()
defer dialerCloseHooksMutex.Unlock()
dialerCloseHooks = nil
}
// DialContext wraps the net.Dialer's DialContext method to use the custom connection
func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
var resolver *net.Resolver
if d.Resolver != nil {
resolver = d.Resolver
}
connID := GenerateConnID()
if dialerDialHooks != nil {
if err := calliDialerHooks(ctx, connID, address, resolver); err != nil {
log.Errorf("Failed to call dialer hooks: %v", err)
}
}
conn, err := d.Dialer.DialContext(ctx, network, address)
if err != nil {
return nil, fmt.Errorf("dial: %w", err)
}
// Wrap the connection in Conn to handle Close with hooks
return &Conn{Conn: conn, ID: connID}, nil
}
// Dial wraps the net.Dialer's Dial method to use the custom connection
func (d *Dialer) Dial(network, address string) (net.Conn, error) {
return d.DialContext(context.Background(), network, address)
}
// Conn wraps a net.Conn to override the Close method
type Conn struct {
net.Conn
ID ConnectionID
}
// Close overrides the net.Conn Close method to execute all registered hooks after closing the connection
func (c *Conn) Close() error {
err := c.Conn.Close()
dialerCloseHooksMutex.RLock()
defer dialerCloseHooksMutex.RUnlock()
for _, hook := range dialerCloseHooks {
if err := hook(c.ID, &c.Conn); err != nil {
log.Errorf("Error executing dialer close hook: %v", err)
}
}
return err
}
func calliDialerHooks(ctx context.Context, connID ConnectionID, address string, resolver *net.Resolver) error {
host, _, err := net.SplitHostPort(address)
if err != nil {
return fmt.Errorf("split host and port: %w", err)
}
ips, err := resolver.LookupIPAddr(ctx, host)
if err != nil {
return fmt.Errorf("failed to resolve address %s: %w", address, err)
}
log.Debugf("Dialer resolved IPs for %s: %v", address, ips)
var result *multierror.Error
dialerDialHooksMutex.RLock()
defer dialerDialHooksMutex.RUnlock()
for _, hook := range dialerDialHooks {
if err := hook(ctx, connID, ips); err != nil {
result = multierror.Append(result, fmt.Errorf("executing dial hook: %w", err))
}
}
return result.ErrorOrNil()
}
func DialUDP(network string, laddr, raddr *net.UDPAddr) (*net.UDPConn, error) {
dialer := NewDialer()
dialer.LocalAddr = laddr
conn, err := dialer.Dial(network, raddr.String())
if err != nil {
return nil, fmt.Errorf("dialing UDP %s: %w", raddr.String(), err)
}
udpConn, ok := conn.(*Conn).Conn.(*net.UDPConn)
if !ok {
if err := conn.Close(); err != nil {
log.Errorf("Failed to close connection: %v", err)
}
return nil, fmt.Errorf("expected UDP connection, got different type: %T", conn)
}
return udpConn, nil
}
func DialTCP(network string, laddr, raddr *net.TCPAddr) (*net.TCPConn, error) {
dialer := NewDialer()
dialer.LocalAddr = laddr
conn, err := dialer.Dial(network, raddr.String())
if err != nil {
return nil, fmt.Errorf("dialing TCP %s: %w", raddr.String(), err)
}
tcpConn, ok := conn.(*Conn).Conn.(*net.TCPConn)
if !ok {
if err := conn.Close(); err != nil {
log.Errorf("Failed to close connection: %v", err)
}
return nil, fmt.Errorf("expected TCP connection, got different type: %T", conn)
}
return tcpConn, nil
}

12
util/net/dialer_linux.go Normal file
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//go:build !android
package net
import "syscall"
// init configures the net.Dialer Control function to set the fwmark on the socket
func (d *Dialer) init() {
d.Dialer.Control = func(_, _ string, c syscall.RawConn) error {
return SetRawSocketMark(c)
}
}

6
util/net/dialer_nonlinux.go Normal file
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//go:build !linux || android
package net
func (d *Dialer) init() {
}

21
util/net/listener.go Normal file
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package net
import (
"net"
)
// ListenerConfig extends the standard net.ListenConfig with the ability to execute hooks before
// responding via the socket and after closing. This can be used to bypass the VPN for listeners.
type ListenerConfig struct {
*net.ListenConfig
}
// NewListener creates a new ListenerConfig instance.
func NewListener() *ListenerConfig {
listener := &ListenerConfig{
ListenConfig: &net.ListenConfig{},
}
listener.init()
return listener
}

163
util/net/listener_generic.go Normal file
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//go:build !android && !ios
package net
import (
"context"
"fmt"
"net"
"sync"
log "github.com/sirupsen/logrus"
)
// ListenerWriteHookFunc defines the function signature for write hooks for PacketConn.
type ListenerWriteHookFunc func(connID ConnectionID, ip *net.IPAddr, data []byte) error
// ListenerCloseHookFunc defines the function signature for close hooks for PacketConn.
type ListenerCloseHookFunc func(connID ConnectionID, conn net.PacketConn) error
var (
listenerWriteHooksMutex sync.RWMutex
listenerWriteHooks []ListenerWriteHookFunc
listenerCloseHooksMutex sync.RWMutex
listenerCloseHooks []ListenerCloseHookFunc
)
// AddListenerWriteHook allows adding a new write hook to be executed before a UDP packet is sent.
func AddListenerWriteHook(hook ListenerWriteHookFunc) {
listenerWriteHooksMutex.Lock()
defer listenerWriteHooksMutex.Unlock()
listenerWriteHooks = append(listenerWriteHooks, hook)
}
// AddListenerCloseHook allows adding a new hook to be executed upon closing a UDP connection.
func AddListenerCloseHook(hook ListenerCloseHookFunc) {
listenerCloseHooksMutex.Lock()
defer listenerCloseHooksMutex.Unlock()
listenerCloseHooks = append(listenerCloseHooks, hook)
}
// RemoveListenerHooks removes all dialer hooks.
func RemoveListenerHooks() {
listenerWriteHooksMutex.Lock()
defer listenerWriteHooksMutex.Unlock()
listenerWriteHooks = nil
listenerCloseHooksMutex.Lock()
defer listenerCloseHooksMutex.Unlock()
listenerCloseHooks = nil
}
// ListenPacket listens on the network address and returns a PacketConn
// which includes support for write hooks.
func (l *ListenerConfig) ListenPacket(ctx context.Context, network, address string) (net.PacketConn, error) {
pc, err := l.ListenConfig.ListenPacket(ctx, network, address)
if err != nil {
return nil, fmt.Errorf("listen packet: %w", err)
}
connID := GenerateConnID()
return &PacketConn{PacketConn: pc, ID: connID, seenAddrs: &sync.Map{}}, nil
}
// PacketConn wraps net.PacketConn to override its WriteTo and Close methods to include hook functionality.
type PacketConn struct {
net.PacketConn
ID ConnectionID
seenAddrs *sync.Map
}
// WriteTo writes a packet with payload b to addr, executing registered write hooks beforehand.
func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
callWriteHooks(c.ID, c.seenAddrs, b, addr)
return c.PacketConn.WriteTo(b, addr)
}
// Close overrides the net.PacketConn Close method to execute all registered hooks before closing the connection.
func (c *PacketConn) Close() error {
c.seenAddrs = &sync.Map{}
return closeConn(c.ID, c.PacketConn)
}
// UDPConn wraps net.UDPConn to override its WriteTo and Close methods to include hook functionality.
type UDPConn struct {
*net.UDPConn
ID ConnectionID
seenAddrs *sync.Map
}
// WriteTo writes a packet with payload b to addr, executing registered write hooks beforehand.
func (c *UDPConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
callWriteHooks(c.ID, c.seenAddrs, b, addr)
return c.UDPConn.WriteTo(b, addr)
}
// Close overrides the net.UDPConn Close method to execute all registered hooks before closing the connection.
func (c *UDPConn) Close() error {
c.seenAddrs = &sync.Map{}
return closeConn(c.ID, c.UDPConn)
}
func callWriteHooks(id ConnectionID, seenAddrs *sync.Map, b []byte, addr net.Addr) {
// Lookup the address in the seenAddrs map to avoid calling the hooks for every write
if _, loaded := seenAddrs.LoadOrStore(addr.String(), true); !loaded {
ipStr, _, splitErr := net.SplitHostPort(addr.String())
if splitErr != nil {
log.Errorf("Error splitting IP address and port: %v", splitErr)
return
}
ip, err := net.ResolveIPAddr("ip", ipStr)
if err != nil {
log.Errorf("Error resolving IP address: %v", err)
return
}
log.Debugf("Listener resolved IP for %s: %s", addr, ip)
func() {
listenerWriteHooksMutex.RLock()
defer listenerWriteHooksMutex.RUnlock()
for _, hook := range listenerWriteHooks {
if err := hook(id, ip, b); err != nil {
log.Errorf("Error executing listener write hook: %v", err)
}
}
}()
}
}
func closeConn(id ConnectionID, conn net.PacketConn) error {
err := conn.Close()
listenerCloseHooksMutex.RLock()
defer listenerCloseHooksMutex.RUnlock()
for _, hook := range listenerCloseHooks {
if err := hook(id, conn); err != nil {
log.Errorf("Error executing listener close hook: %v", err)
}
}
return err
}
// ListenUDP listens on the network address and returns a transport.UDPConn
// which includes support for write and close hooks.
func ListenUDP(network string, laddr *net.UDPAddr) (*UDPConn, error) {
conn, err := NewListener().ListenPacket(context.Background(), network, laddr.String())
if err != nil {
return nil, fmt.Errorf("listen UDP: %w", err)
}
packetConn := conn.(*PacketConn)
udpConn, ok := packetConn.PacketConn.(*net.UDPConn)
if !ok {
if err := packetConn.Close(); err != nil {
log.Errorf("Failed to close connection: %v", err)
}
return nil, fmt.Errorf("expected UDPConn, got different type: %T", udpConn)
}
return &UDPConn{UDPConn: udpConn, ID: packetConn.ID, seenAddrs: &sync.Map{}}, nil
}

14
util/net/listener_linux.go Normal file
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//go:build !android
package net
import (
"syscall"
)
// init configures the net.ListenerConfig Control function to set the fwmark on the socket
func (l *ListenerConfig) init() {
l.ListenConfig.Control = func(_, _ string, c syscall.RawConn) error {
return SetRawSocketMark(c)
}
}

11
util/net/listener_mobile.go Normal file
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//go:build android || ios
package net
import (
"net"
)
func ListenUDP(network string, laddr *net.UDPAddr) (*net.UDPConn, error) {
return net.ListenUDP(network, laddr)
}

6
util/net/listener_nonlinux.go Normal file
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//go:build !linux || android
package net
func (l *ListenerConfig) init() {
}

17
util/net/net.go Normal file
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package net
import "github.com/google/uuid"
const (
// NetbirdFwmark is the fwmark value used by Netbird via wireguard
NetbirdFwmark = 0x1BD00
)
// ConnectionID provides a globally unique identifier for network connections.
// It's used to track connections throughout their lifecycle so the close hook can correlate with the dial hook.
type ConnectionID string
// GenerateConnID generates a unique identifier for each connection.
func GenerateConnID() ConnectionID {
return ConnectionID(uuid.NewString())
}

35
util/net/net_linux.go Normal file
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//go:build !android
package net
import (
"fmt"
"syscall"
)
// SetSocketMark sets the SO_MARK option on the given socket connection
func SetSocketMark(conn syscall.Conn) error {
sysconn, err := conn.SyscallConn()
if err != nil {
return fmt.Errorf("get raw conn: %w", err)
}
return SetRawSocketMark(sysconn)
}
func SetRawSocketMark(conn syscall.RawConn) error {
var setErr error
err := conn.Control(func(fd uintptr) {
setErr = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, NetbirdFwmark)
})
if err != nil {
return fmt.Errorf("control: %w", err)
}
if setErr != nil {
return fmt.Errorf("set SO_MARK: %w", setErr)
}
return nil
}