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[client] Allow userspace local forwarding to internal interfaces if requested (#3884)

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Viktor Liu 2025-06-04 18:12:48 +02:00 committed by GitHub
parent b604c66140
commit 609654eee7
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GPG Key ID: B5690EEEBB952194
3 changed files with 20 additions and 11 deletions
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4
client/firewall/uspfilter/forwarder/tcp.go
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@ -111,12 +111,12 @@ func (f *Forwarder) proxyTCP(id stack.TransportEndpointID, inConn *gonet.TCPConn
if errInToOut != nil {
if !isClosedError(errInToOut) {
f.logger.Error("proxyTCP: copy error (in -> out): %v", errInToOut)
f.logger.Error("proxyTCP: copy error (in -> out) for %s: %v", epID(id), errInToOut)
}
}
if errOutToIn != nil {
if !isClosedError(errOutToIn) {
f.logger.Error("proxyTCP: copy error (out -> in): %v", errOutToIn)
f.logger.Error("proxyTCP: copy error (out -> in) for %s: %v", epID(id), errOutToIn)
}
}

4
client/firewall/uspfilter/forwarder/udp.go
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@ -250,10 +250,10 @@ func (f *Forwarder) proxyUDP(ctx context.Context, pConn *udpPacketConn, id stack
wg.Wait()
if outboundErr != nil && !isClosedError(outboundErr) {
f.logger.Error("proxyUDP: copy error (outbound->inbound): %v", outboundErr)
f.logger.Error("proxyUDP: copy error (outbound->inbound) for %s: %v", epID(id), outboundErr)
}
if inboundErr != nil && !isClosedError(inboundErr) {
f.logger.Error("proxyUDP: copy error (inbound->outbound): %v", inboundErr)
f.logger.Error("proxyUDP: copy error (inbound->outbound) for %s: %v", epID(id), inboundErr)
}
var rxPackets, txPackets uint64

23
client/firewall/uspfilter/uspfilter.go
View File

@ -39,8 +39,12 @@ const (
// EnvForceUserspaceRouter forces userspace routing even if native routing is available.
EnvForceUserspaceRouter = "NB_FORCE_USERSPACE_ROUTER"
// EnvEnableNetstackLocalForwarding enables forwarding of local traffic to the native stack when running netstack
// Leaving this on by default introduces a security risk as sockets on listening on localhost only will be accessible
// EnvEnableLocalForwarding enables forwarding of local traffic to the native stack for internal (non-NetBird) interfaces.
// Default off as it might be security risk because sockets listening on localhost only will become accessible.
EnvEnableLocalForwarding = "NB_ENABLE_LOCAL_FORWARDING"
// EnvEnableNetstackLocalForwarding is an alias for EnvEnableLocalForwarding.
// In netstack mode, it enables forwarding of local traffic to the native stack for all interfaces.
EnvEnableNetstackLocalForwarding = "NB_ENABLE_NETSTACK_LOCAL_FORWARDING"
)
@ -147,6 +151,11 @@ func parseCreateEnv() (bool, bool) {
if err != nil {
log.Warnf("failed to parse %s: %v", EnvEnableNetstackLocalForwarding, err)
}
} else if val := os.Getenv(EnvEnableLocalForwarding); val != "" {
enableLocalForwarding, err = strconv.ParseBool(val)
if err != nil {
log.Warnf("failed to parse %s: %v", EnvEnableLocalForwarding, err)
}
}
return disableConntrack, enableLocalForwarding
@ -779,9 +788,10 @@ func (m *Manager) handleLocalTraffic(d *decoder, srcIP, dstIP netip.Addr, packet
return true
}
// if running in netstack mode we need to pass this to the forwarder
if m.netstack && m.localForwarding {
return m.handleNetstackLocalTraffic(packetData)
// If requested we pass local traffic to internal interfaces to the forwarder.
// netstack doesn't have an interface to forward packets to the native stack so we always need to use the forwarder.
if m.localForwarding && (m.netstack || dstIP != m.wgIface.Address().IP) {
return m.handleForwardedLocalTraffic(packetData)
}
// track inbound packets to get the correct direction and session id for flows
@ -791,8 +801,7 @@ func (m *Manager) handleLocalTraffic(d *decoder, srcIP, dstIP netip.Addr, packet
return false
}
func (m *Manager) handleNetstackLocalTraffic(packetData []byte) bool {
func (m *Manager) handleForwardedLocalTraffic(packetData []byte) bool {
fwd := m.forwarder.Load()
if fwd == nil {
m.logger.Trace("Dropping local packet (forwarder not initialized)")