Merge remote-tracking branch 'tun/with-tun' into Alpha

adapter/outbound/direct.go

@@ -14,6 +14,7 @@ type Direct struct {
 
 // DialContext implements C.ProxyAdapter
 func (d *Direct) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.Conn, error) {
+	opts = append(opts, dialer.WithDirect())
 	c, err := dialer.DialContext(ctx, "tcp", metadata.RemoteAddress(), d.Base.DialOptions(opts...)...)
 	if err != nil {
 		return nil, err
@@ -24,6 +25,7 @@ func (d *Direct) DialContext(ctx context.Context, metadata *C.Metadata, opts ...
 
 // ListenPacketContext implements C.ProxyAdapter
 func (d *Direct) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.PacketConn, error) {
+	opts = append(opts, dialer.WithDirect())
 	pc, err := dialer.ListenPacket(ctx, "udp", "", d.Base.DialOptions(opts...)...)
 	if err != nil {
 		return nil, err

adapter/outbound/util.go

@@ -67,7 +67,7 @@ func resolveUDPAddr(network, address string) (*net.UDPAddr, error) {
 		return nil, err
 	}
 
-	ip, err := resolver.ResolveIP(host)
+	ip, err := resolver.ResolveProxyServerHost(host)
 	if err != nil {
 		return nil, err
 	}

adapter/provider/healthcheck.go

@@ -31,7 +31,13 @@ type HealthCheck struct {
 func (hc *HealthCheck) process() {
 	ticker := time.NewTicker(time.Duration(hc.interval) * time.Second)
 
-	go hc.check()
+	go func() {
+		t := time.NewTicker(30 * time.Second)
+		<-t.C
+		t.Stop()
+		hc.check()
+	}()
+
 	for {
 		select {
 		case <-ticker.C:

component/dialer/dialer.go

@@ -32,14 +32,14 @@ func DialContext(ctx context.Context, network, address string, options ...Option
 		var ip net.IP
 		switch network {
 		case "tcp4", "udp4":
-			if opt.interfaceName != "" {
+			if !opt.direct {
-				ip, err = resolver.ResolveIPv4WithMain(host)
+				ip, err = resolver.ResolveIPv4ProxyServerHost(host)
 			} else {
 				ip, err = resolver.ResolveIPv4(host)
 			}
 		default:
-			if opt.interfaceName != "" {
+			if !opt.direct {
-				ip, err = resolver.ResolveIPv6WithMain(host)
+				ip, err = resolver.ResolveIPv6ProxyServerHost(host)
 			} else {
 				ip, err = resolver.ResolveIPv6(host)
 			}
@@ -121,7 +121,7 @@ func dualStackDialContext(ctx context.Context, network, address string, opt *opt
 	results := make(chan dialResult)
 	var primary, fallback dialResult
 
-	startRacer := func(ctx context.Context, network, host string, ipv6 bool) {
+	startRacer := func(ctx context.Context, network, host string, direct bool, ipv6 bool) {
 		result := dialResult{ipv6: ipv6, done: true}
 		defer func() {
 			select {
@@ -135,14 +135,14 @@ func dualStackDialContext(ctx context.Context, network, address string, opt *opt
 
 		var ip net.IP
 		if ipv6 {
-			if opt.interfaceName != "" {
+			if !direct {
-				ip, result.error = resolver.ResolveIPv6WithMain(host)
+				ip, result.error = resolver.ResolveIPv6ProxyServerHost(host)
 			} else {
 				ip, result.error = resolver.ResolveIPv6(host)
 			}
 		} else {
-			if opt.interfaceName != "" {
+			if !direct {
-				ip, result.error = resolver.ResolveIPv4WithMain(host)
+				ip, result.error = resolver.ResolveIPv4ProxyServerHost(host)
 			} else {
 				ip, result.error = resolver.ResolveIPv4(host)
 			}
@@ -155,8 +155,8 @@ func dualStackDialContext(ctx context.Context, network, address string, opt *opt
 		result.Conn, result.error = dialContext(ctx, network, ip, port, opt)
 	}
 
-	go startRacer(ctx, network+"4", host, false)
+	go startRacer(ctx, network+"4", host, opt.direct, false)
-	go startRacer(ctx, network+"6", host, true)
+	go startRacer(ctx, network+"6", host, opt.direct, true)
 
 	for res := range results {
 		if res.error == nil {

component/dialer/options.go

@@ -12,6 +12,7 @@ type option struct {
 	interfaceName string
 	addrReuse     bool
 	routingMark   int
+	direct        bool
 }
 
 type Option func(opt *option)
@@ -33,3 +34,9 @@ func WithRoutingMark(mark int) Option {
 		opt.routingMark = mark
 	}
 }
+
+func WithDirect() Option {
+	return func(opt *option) {
+		opt.direct = true
+	}
+}

component/resolver/resolver.go

@@ -15,8 +15,8 @@ var (
 	// DefaultResolver aim to resolve ip
 	DefaultResolver Resolver
 
-	// MainResolver resolve ip with main domain server
+	// ProxyServerHostResolver resolve ip to proxies server host
-	MainResolver Resolver
+	ProxyServerHostResolver Resolver
 
 	// DisableIPv6 means don't resolve ipv6 host
 	// default value is true
@@ -46,10 +46,6 @@ func ResolveIPv4(host string) (net.IP, error) {
 	return ResolveIPv4WithResolver(host, DefaultResolver)
 }
 
-func ResolveIPv4WithMain(host string) (net.IP, error) {
-	return ResolveIPv4WithResolver(host, MainResolver)
-}
-
 func ResolveIPv4WithResolver(host string, r Resolver) (net.IP, error) {
 	if node := DefaultHosts.Search(host); node != nil {
 		if ip := node.Data.(net.IP).To4(); ip != nil {
@@ -69,6 +65,7 @@ func ResolveIPv4WithResolver(host string, r Resolver) (net.IP, error) {
 		return r.ResolveIPv4(host)
 	}
 
+	if DefaultResolver == nil {
 		ctx, cancel := context.WithTimeout(context.Background(), DefaultDNSTimeout)
 		defer cancel()
 		ipAddrs, err := net.DefaultResolver.LookupIP(ctx, "ip4", host)
@@ -79,6 +76,9 @@ func ResolveIPv4WithResolver(host string, r Resolver) (net.IP, error) {
 		}
 
 		return ipAddrs[rand.Intn(len(ipAddrs))], nil
+	}
+
+	return nil, ErrIPNotFound
 }
 
 // ResolveIPv6 with a host, return ipv6
@@ -86,10 +86,6 @@ func ResolveIPv6(host string) (net.IP, error) {
 	return ResolveIPv6WithResolver(host, DefaultResolver)
 }
 
-func ResolveIPv6WithMain(host string) (net.IP, error) {
-	return ResolveIPv6WithResolver(host, MainResolver)
-}
-
 func ResolveIPv6WithResolver(host string, r Resolver) (net.IP, error) {
 	if DisableIPv6 {
 		return nil, ErrIPv6Disabled
@@ -113,6 +109,7 @@ func ResolveIPv6WithResolver(host string, r Resolver) (net.IP, error) {
 		return r.ResolveIPv6(host)
 	}
 
+	if DefaultResolver == nil {
 		ctx, cancel := context.WithTimeout(context.Background(), DefaultDNSTimeout)
 		defer cancel()
 		ipAddrs, err := net.DefaultResolver.LookupIP(ctx, "ip6", host)
@@ -123,6 +120,9 @@ func ResolveIPv6WithResolver(host string, r Resolver) (net.IP, error) {
 		}
 
 		return ipAddrs[rand.Intn(len(ipAddrs))], nil
+	}
+
+	return nil, ErrIPNotFound
 }
 
 // ResolveIPWithResolver same as ResolveIP, but with a resolver
@@ -145,12 +145,16 @@ func ResolveIPWithResolver(host string, r Resolver) (net.IP, error) {
 		return ip, nil
 	}
 
+	if DefaultResolver == nil {
 		ipAddr, err := net.ResolveIPAddr("ip", host)
 		if err != nil {
 			return nil, err
 		}
 
 		return ipAddr.IP, nil
+	}
+
+	return nil, ErrIPNotFound
 }
 
 // ResolveIP with a host, return ip
@@ -158,7 +162,26 @@ func ResolveIP(host string) (net.IP, error) {
 	return ResolveIPWithResolver(host, DefaultResolver)
 }
 
-// ResolveIPWithMainResolver with a host, use main resolver, return ip
+// ResolveIPv4ProxyServerHost proxies server host only
-func ResolveIPWithMainResolver(host string) (net.IP, error) {
+func ResolveIPv4ProxyServerHost(host string) (net.IP, error) {
-	return ResolveIPWithResolver(host, MainResolver)
+	if ProxyServerHostResolver != nil {
+		return ResolveIPv4WithResolver(host, ProxyServerHostResolver)
+	}
+	return ResolveIPv4(host)
+}
+
+// ResolveIPv6ProxyServerHost proxies server host only
+func ResolveIPv6ProxyServerHost(host string) (net.IP, error) {
+	if ProxyServerHostResolver != nil {
+		return ResolveIPv6WithResolver(host, ProxyServerHostResolver)
+	}
+	return ResolveIPv6(host)
+}
+
+// ResolveProxyServerHost proxies server host only
+func ResolveProxyServerHost(host string) (net.IP, error) {
+	if ProxyServerHostResolver != nil {
+		return ResolveIPWithResolver(host, ProxyServerHostResolver)
+	}
+	return ResolveIP(host)
 }

config/config.go

@@ -81,6 +81,7 @@ type DNS struct {
 	FakeIPRange           *fakeip.Pool
 	Hosts                 *trie.DomainTrie
 	NameServerPolicy      map[string]dns.NameServer
+	ProxyServerNameserver []dns.NameServer
 }
 
 // FallbackFilter config
@@ -158,6 +159,7 @@ type RawDNS struct {
 	FakeIPFilter          []string          `yaml:"fake-ip-filter"`
 	DefaultNameserver     []string          `yaml:"default-nameserver"`
 	NameServerPolicy      map[string]string `yaml:"nameserver-policy"`
+	ProxyServerNameserver []string          `yaml:"proxy-server-nameserver"`
 }
 
 type RawFallbackFilter struct {
@@ -805,6 +807,10 @@ func parseDNS(rawCfg *RawConfig, hosts *trie.DomainTrie, rules []C.Rule) (*DNS,
 		return nil, err
 	}
 
+	if dnsCfg.ProxyServerNameserver, err = parseNameServer(cfg.ProxyServerNameserver); err != nil {
+		return nil, err
+	}
+
 	if len(cfg.DefaultNameserver) == 0 {
 		return nil, errors.New("default nameserver should have at least one nameserver")
 	}

dns/resolver.go

@@ -41,6 +41,7 @@ type Resolver struct {
 	group                 singleflight.Group
 	lruCache              *cache.LruCache
 	policy                *trie.DomainTrie
+	proxyServer           []dnsClient
 }
 
 // ResolveIP request with TypeA and TypeAAAA, priority return TypeA
@@ -300,6 +301,11 @@ func (r *Resolver) asyncExchange(ctx context.Context, client []dnsClient, msg *D
 	return ch
 }
 
+// HasProxyServer has proxy server dns client
+func (r *Resolver) HasProxyServer() bool {
+	return len(r.main) > 0
+}
+
 type NameServer struct {
 	Net          string
 	Addr         string
@@ -318,6 +324,7 @@ type FallbackFilter struct {
 type Config struct {
 	Main, Fallback []NameServer
 	Default        []NameServer
+	ProxyServer    []NameServer
 	IPv6           bool
 	EnhancedMode   C.DNSMode
 	FallbackFilter FallbackFilter
@@ -343,6 +350,10 @@ func NewResolver(config Config) *Resolver {
 		r.fallback = transform(config.Fallback, defaultResolver)
 	}
 
+	if len(config.ProxyServer) != 0 {
+		r.proxyServer = transform(config.ProxyServer, defaultResolver)
+	}
+
 	if len(config.Policy) != 0 {
 		r.policy = trie.New()
 		for domain, nameserver := range config.Policy {
@@ -376,10 +387,10 @@ func NewResolver(config Config) *Resolver {
 	return r
 }
 
-func NewMainResolver(old *Resolver) *Resolver {
+func NewProxyServerHostResolver(old *Resolver) *Resolver {
 	r := &Resolver{
 		ipv6:     old.ipv6,
-		main:     old.main,
+		main:     old.proxyServer,
 		lruCache: old.lruCache,
 		hosts:    old.hosts,
 		policy:   old.policy,

hub/executor/executor.go

@@ -133,10 +133,11 @@ func updateDNS(c *config.DNS, t *config.Tun) {
 		},
 		Default:     c.DefaultNameserver,
 		Policy:      c.NameServerPolicy,
+		ProxyServer: c.ProxyServerNameserver,
 	}
 
 	r := dns.NewResolver(cfg)
-	mr := dns.NewMainResolver(r)
+	pr := dns.NewProxyServerHostResolver(r)
 	m := dns.NewEnhancer(cfg)
 
 	// reuse cache of old host mapper
@@ -145,9 +146,12 @@ func updateDNS(c *config.DNS, t *config.Tun) {
 	}
 
 	resolver.DefaultResolver = r
-	resolver.MainResolver = mr
 	resolver.DefaultHostMapper = m
 
+	if pr.HasProxyServer() {
+		resolver.ProxyServerHostResolver = pr
+	}
+
 	if t.Enable {
 		resolver.DefaultLocalServer = dns.NewLocalServer(r, m)
 	}
@@ -157,9 +161,9 @@ func updateDNS(c *config.DNS, t *config.Tun) {
 	} else {
 		if !t.Enable {
 			resolver.DefaultResolver = nil
-			resolver.MainResolver = nil
 			resolver.DefaultHostMapper = nil
 			resolver.DefaultLocalServer = nil
+			resolver.ProxyServerHostResolver = nil
 		}
 		dns.ReCreateServer("", nil, nil)
 	}
@@ -365,7 +369,9 @@ func updateIPTables(cfg *config.Config) {
 	log.Infoln("[IPTABLES] Setting iptables completed")
 }
 
-func Cleanup() {
+func Shutdown() {
 	P.Cleanup()
 	tproxy.CleanupTProxyIPTables()
+
+	log.Warnln("Clash shutting down")
 }

hub/hub.go

@@ -48,7 +48,3 @@ func Parse(options ...Option) error {
 	executor.ApplyConfig(cfg, true)
 	return nil
 }
-
-func Cleanup() {
-	executor.Cleanup()
-}

listener/tun/device/device.go

@@ -29,4 +29,7 @@ type Device interface {
 
 	// UseIOBased work for other ip stack
 	UseIOBased() error
+
+	// Wait waits for the device to close.
+	Wait()
 }

listener/tun/device/iobased/endpoint.go

@@ -103,7 +103,7 @@ func (e *Endpoint) dispatchLoop(cancel context.CancelFunc) {
 		case header.IPv6Version:
 			e.InjectInbound(header.IPv6ProtocolNumber, pkt)
 		}
-		pkt.DecRef() /* release */
+		pkt.DecRef()
 	}
 }
 

listener/tun/device/tun/tun_wireguard.go

@@ -106,6 +106,9 @@ func (t *TUN) Write(packet []byte) (int, error) {
 }
 
 func (t *TUN) Close() error {
+	if t.Endpoint != nil {
+		t.Endpoint.Close()
+	}
 	return t.nt.Close()
 }
 

listener/tun/ipstack/gvisor/adapter/handler.go

@@ -3,6 +3,12 @@ package adapter
 // Handler is a TCP/UDP connection handler that implements
 // HandleTCPConn and HandleUDPConn methods.
 type Handler interface {
-	HandleTCPConn(TCPConn)
+	HandleTCP(TCPConn)
-	HandleUDPConn(UDPConn)
+	HandleUDP(UDPConn)
 }
+
+// TCPHandleFunc handles incoming TCP connection.
+type TCPHandleFunc func(TCPConn)
+
+// UDPHandleFunc handles incoming UDP connection.
+type UDPHandleFunc func(UDPConn)

listener/tun/ipstack/gvisor/handler.go

@@ -24,7 +24,7 @@ type GVHandler struct {
 	UDPIn chan<- *inbound.PacketAdapter
 }
 
-func (gh *GVHandler) HandleTCPConn(tunConn adapter.TCPConn) {
+func (gh *GVHandler) HandleTCP(tunConn adapter.TCPConn) {
 	id := tunConn.ID()
 
 	rAddr := &net.UDPAddr{
@@ -77,7 +77,7 @@ func (gh *GVHandler) HandleTCPConn(tunConn adapter.TCPConn) {
 	gh.TCPIn <- inbound.NewSocket(socks5.ParseAddrToSocksAddr(rAddr), tunConn, C.TUN)
 }
 
-func (gh *GVHandler) HandleUDPConn(tunConn adapter.UDPConn) {
+func (gh *GVHandler) HandleUDP(tunConn adapter.UDPConn) {
 	id := tunConn.ID()
 
 	rAddr := &net.UDPAddr{

listener/tun/ipstack/gvisor/nic.go

@@ -3,14 +3,13 @@ package gvisor
 import (
 	"fmt"
 
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/option"
+
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 )
 
 const (
-	// defaultNICID is the ID of default NIC used by DefaultStack.
-	defaultNICID tcpip.NICID = 0x01
-
 	// nicPromiscuousModeEnabled is the value used by stack to enable
 	// or disable NIC's promiscuous mode.
 	nicPromiscuousModeEnabled = true
@@ -21,9 +20,9 @@ const (
 )
 
 // withCreatingNIC creates NIC for stack.
-func withCreatingNIC(ep stack.LinkEndpoint) Option {
+func withCreatingNIC(nicID tcpip.NICID, ep stack.LinkEndpoint) option.Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
-		if err := s.CreateNICWithOptions(s.nicID, ep,
+		if err := s.CreateNICWithOptions(nicID, ep,
 			stack.NICOptions{
 				Disabled: false,
 				// If no queueing discipline was specified
@@ -37,21 +36,21 @@ func withCreatingNIC(ep stack.LinkEndpoint) Option {
 	}
 }
 
-// withPromiscuousMode sets promiscuous mode in the given NIC.
+// withPromiscuousMode sets promiscuous mode in the given NICs.
-func withPromiscuousMode(v bool) Option {
+func withPromiscuousMode(nicID tcpip.NICID, v bool) option.Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
-		if err := s.SetPromiscuousMode(s.nicID, v); err != nil {
+		if err := s.SetPromiscuousMode(nicID, v); err != nil {
 			return fmt.Errorf("set promiscuous mode: %s", err)
 		}
 		return nil
 	}
 }
 
-// withSpoofing sets address spoofing in the given NIC, allowing
+// withSpoofing sets address spoofing in the given NICs, allowing
 // endpoints to bind to any address in the NIC.
-func withSpoofing(v bool) Option {
+func withSpoofing(nicID tcpip.NICID, v bool) option.Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
-		if err := s.SetSpoofing(s.nicID, v); err != nil {
+		if err := s.SetSpoofing(nicID, v); err != nil {
 			return fmt.Errorf("set spoofing: %s", err)
 		}
 		return nil

listener/tun/ipstack/gvisor/option/option.go

@@ -1,4 +1,4 @@
-package gvisor
+package option
 
 import (
 	"fmt"
@@ -7,6 +7,7 @@ import (
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
 	"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
 	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
 )
 
@@ -56,11 +57,11 @@ const (
 	tcpDefaultBufferSize = 212 << 10 // 212 KiB
 )
 
-type Option func(*gvStack) error
+type Option func(*stack.Stack) error
 
 // WithDefault sets all default values for stack.
 func WithDefault() Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		opts := []Option{
 			WithDefaultTTL(defaultTimeToLive),
 			WithForwarding(ipForwardingEnabled),
@@ -110,7 +111,7 @@ func WithDefault() Option {
 
 // WithDefaultTTL sets the default TTL used by stack.
 func WithDefaultTTL(ttl uint8) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		opt := tcpip.DefaultTTLOption(ttl)
 		if err := s.SetNetworkProtocolOption(ipv4.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set ipv4 default TTL: %s", err)
@@ -124,7 +125,7 @@ func WithDefaultTTL(ttl uint8) Option {
 
 // WithForwarding sets packet forwarding between NICs for IPv4 & IPv6.
 func WithForwarding(v bool) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		if err := s.SetForwardingDefaultAndAllNICs(ipv4.ProtocolNumber, v); err != nil {
 			return fmt.Errorf("set ipv4 forwarding: %s", err)
 		}
@@ -138,7 +139,7 @@ func WithForwarding(v bool) Option {
 // WithICMPBurst sets the number of ICMP messages that can be sent
 // in a single burst.
 func WithICMPBurst(burst int) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		s.SetICMPBurst(burst)
 		return nil
 	}
@@ -147,7 +148,7 @@ func WithICMPBurst(burst int) Option {
 // WithICMPLimit sets the maximum number of ICMP messages permitted
 // by rate limiter.
 func WithICMPLimit(limit rate.Limit) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		s.SetICMPLimit(limit)
 		return nil
 	}
@@ -155,7 +156,7 @@ func WithICMPLimit(limit rate.Limit) Option {
 
 // WithTCPBufferSizeRange sets the receive and send buffer size range for TCP.
 func WithTCPBufferSizeRange(a, b, c int) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		rcvOpt := tcpip.TCPReceiveBufferSizeRangeOption{Min: a, Default: b, Max: c}
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &rcvOpt); err != nil {
 			return fmt.Errorf("set TCP receive buffer size range: %s", err)
@@ -170,7 +171,7 @@ func WithTCPBufferSizeRange(a, b, c int) Option {
 
 // WithTCPCongestionControl sets the current congestion control algorithm.
 func WithTCPCongestionControl(cc string) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		opt := tcpip.CongestionControlOption(cc)
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set TCP congestion control algorithm: %s", err)
@@ -181,7 +182,7 @@ func WithTCPCongestionControl(cc string) Option {
 
 // WithTCPDelay enables or disables Nagle's algorithm in TCP.
 func WithTCPDelay(v bool) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		opt := tcpip.TCPDelayEnabled(v)
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set TCP delay: %s", err)
@@ -192,7 +193,7 @@ func WithTCPDelay(v bool) Option {
 
 // WithTCPModerateReceiveBuffer sets receive buffer moderation for TCP.
 func WithTCPModerateReceiveBuffer(v bool) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		opt := tcpip.TCPModerateReceiveBufferOption(v)
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set TCP moderate receive buffer: %s", err)
@@ -203,7 +204,7 @@ func WithTCPModerateReceiveBuffer(v bool) Option {
 
 // WithTCPSACKEnabled sets the SACK option for TCP.
 func WithTCPSACKEnabled(v bool) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		opt := tcpip.TCPSACKEnabled(v)
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
 			return fmt.Errorf("set TCP SACK: %s", err)
@@ -214,7 +215,7 @@ func WithTCPSACKEnabled(v bool) Option {
 
 // WithTCPRecovery sets the recovery option for TCP.
 func WithTCPRecovery(v tcpip.TCPRecovery) Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
 		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &v); err != nil {
 			return fmt.Errorf("set TCP Recovery: %s", err)
 		}

listener/tun/ipstack/gvisor/route.go

@@ -1,22 +1,23 @@
 package gvisor
 
 import (
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/option"
+
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/header"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
 )
 
-func withICMPHandler() Option {
+func withRouteTable(nicID tcpip.NICID) option.Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
-		// Add default route table for IPv4 and IPv6.
-		// This will handle all incoming ICMP packets.
 		s.SetRouteTable([]tcpip.Route{
 			{
 				Destination: header.IPv4EmptySubnet,
-				NIC:         s.nicID,
+				NIC:         nicID,
 			},
 			{
 				Destination: header.IPv6EmptySubnet,
-				NIC:         s.nicID,
+				NIC:         nicID,
 			},
 		})
 		return nil

listener/tun/ipstack/gvisor/stack.go

@@ -5,6 +5,7 @@ import (
 	"github.com/Dreamacro/clash/listener/tun/device"
 	"github.com/Dreamacro/clash/listener/tun/ipstack"
 	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/adapter"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/option"
 
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
@@ -18,23 +19,23 @@ import (
 type gvStack struct {
 	*stack.Stack
 	device device.Device
-
-	handler adapter.Handler
-	nicID   tcpip.NICID
 }
 
 func (s *gvStack) Close() error {
+	var err error
+	if s.device != nil {
+		err = s.device.Close()
+		s.device.Wait()
+	}
 	if s.Stack != nil {
 		s.Stack.Close()
+		s.Stack.Wait()
 	}
-	if s.device != nil {
+	return err
-		_ = s.device.Close()
-	}
-	return nil
 }
 
 // New allocates a new *gvStack with given options.
-func New(device device.Device, handler adapter.Handler, opts ...Option) (ipstack.Stack, error) {
+func New(device device.Device, handler adapter.Handler, opts ...option.Option) (ipstack.Stack, error) {
 	s := &gvStack{
 		Stack: stack.New(stack.Options{
 			NetworkProtocols: []stack.NetworkProtocolFactory{
@@ -50,18 +51,14 @@ func New(device device.Device, handler adapter.Handler, opts ...Option) (ipstack
 		}),
 
 		device: device,
-		handler: handler,
-		nicID:   defaultNICID,
 	}
 
-	opts = append(opts,
+	// Generate unique NIC id.
-		// Important: We must initiate transport protocol handlers
+	nicID := tcpip.NICID(s.Stack.UniqueID())
-		// before creating NIC, otherwise NIC would dispatch packets
-		// to stack and cause race condition.
-		withICMPHandler(), withTCPHandler(), withUDPHandler(),
 
-		// Create stack NIC and then bind link endpoint.
+	opts = append(opts,
-		withCreatingNIC(device.(stack.LinkEndpoint)),
+		// Create stack NIC and then bind link endpoint to it.
+		withCreatingNIC(nicID, device),
 
 		// In the past we did s.AddAddressRange to assign 0.0.0.0/0
 		// onto the interface. We need that to be able to terminate
@@ -70,27 +67,34 @@ func New(device device.Device, handler adapter.Handler, opts ...Option) (ipstack
 		// Promiscuous mode. https://github.com/google/gvisor/issues/3876
 		//
 		// Ref: https://github.com/cloudflare/slirpnetstack/blob/master/stack.go
-		withPromiscuousMode(nicPromiscuousModeEnabled),
+		withPromiscuousMode(nicID, nicPromiscuousModeEnabled),
 
-		// Enable spoofing if a stack may send packets from unowned addresses.
+		// Enable spoofing if a stack may send packets from unowned
-		// This change required changes to some netgophers since previously,
+		// addresses. This change required changes to some netgophers
-		// promiscuous mode was enough to let the netstack respond to all
+		// since previously, promiscuous mode was enough to let the
-		// incoming packets regardless of the packet's destination address. Now
+		// netstack respond to all incoming packets regardless of the
-		// that a stack.Route is not held for each incoming packet, finding a route
+		// packet's destination address. Now that a stack.Route is not
-		// may fail with local addresses we don't own but accepted packets for
+		// held for each incoming packet, finding a route may fail with
-		// while in promiscuous mode. Since we also want to be able to send from
+		// local addresses we don't own but accepted packets for while
-		// any address (in response the received promiscuous mode packets), we need
+		// in promiscuous mode. Since we also want to be able to send
-		// to enable spoofing.
+		// from any address (in response the received promiscuous mode
+		// packets), we need to enable spoofing.
 		//
 		// Ref: https://github.com/google/gvisor/commit/8c0701462a84ff77e602f1626aec49479c308127
-		withSpoofing(nicSpoofingEnabled),
+		withSpoofing(nicID, nicSpoofingEnabled),
+
+		// Add default route table for IPv4 and IPv6. This will handle
+		// all incoming ICMP packets.
+		withRouteTable(nicID),
+
+		// Initiate transport protocol (TCP/UDP) with given handler.
+		withTCPHandler(handler.HandleTCP), withUDPHandler(handler.HandleUDP),
 	)
 
 	for _, opt := range opts {
-		if err := opt(s); err != nil {
+		if err := opt(s.Stack); err != nil {
 			return nil, err
 		}
 	}
-
 	return s, nil
 }

listener/tun/ipstack/gvisor/tcp.go

@@ -4,6 +4,9 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/adapter"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/option"
+
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
@@ -37,9 +40,9 @@ const (
 	tcpKeepaliveInterval = 30 * time.Second
 )
 
-func withTCPHandler() Option {
+func withTCPHandler(handle adapter.TCPHandleFunc) option.Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
-		tcpForwarder := tcp.NewForwarder(s.Stack, defaultWndSize, maxConnAttempts, func(r *tcp.ForwarderRequest) {
+		tcpForwarder := tcp.NewForwarder(s, defaultWndSize, maxConnAttempts, func(r *tcp.ForwarderRequest) {
 			var wq waiter.Queue
 			ep, err := r.CreateEndpoint(&wq)
 			if err != nil {
@@ -55,7 +58,7 @@ func withTCPHandler() Option {
 				TCPConn: gonet.NewTCPConn(&wq, ep),
 				id:      r.ID(),
 			}
-			s.handler.HandleTCPConn(conn)
+			handle(conn)
 		})
 		s.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)
 		return nil

listener/tun/ipstack/gvisor/udp.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/Dreamacro/clash/common/pool"
 	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/adapter"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/option"
 
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
@@ -12,9 +13,9 @@ import (
 	"gvisor.dev/gvisor/pkg/waiter"
 )
 
-func withUDPHandler() Option {
+func withUDPHandler(handle adapter.UDPHandleFunc) option.Option {
-	return func(s *gvStack) error {
+	return func(s *stack.Stack) error {
-		udpForwarder := udp.NewForwarder(s.Stack, func(r *udp.ForwarderRequest) {
+		udpForwarder := udp.NewForwarder(s, func(r *udp.ForwarderRequest) {
 			var wq waiter.Queue
 			ep, err := r.CreateEndpoint(&wq)
 			if err != nil {
@@ -23,10 +24,10 @@ func withUDPHandler() Option {
 			}
 
 			conn := &udpConn{
-				UDPConn: gonet.NewUDPConn(s.Stack, &wq, ep),
+				UDPConn: gonet.NewUDPConn(s, &wq, ep),
 				id:      r.ID(),
 			}
-			s.handler.HandleUDPConn(conn)
+			handle(conn)
 		})
 		s.SetTransportProtocolHandler(udp.ProtocolNumber, udpForwarder.HandlePacket)
 		return nil

listener/tun/ipstack/system/stack.go

@@ -36,8 +36,6 @@ func (s sysStack) Close() error {
 	return nil
 }
 
-var ipv4LoopBack = netip.MustParsePrefix("127.0.0.0/8")
-
 func New(device device.Device, dnsHijack []netip.AddrPort, tunAddress netip.Prefix, tcpIn chan<- C.ConnContext, udpIn chan<- *inbound.PacketAdapter) (ipstack.Stack, error) {
 	var (
 		gateway = tunAddress.Masked().Addr().Next()
@@ -71,12 +69,6 @@ func New(device device.Device, dnsHijack []netip.AddrPort, tunAddress netip.Pref
 			rAddrIp, _ := netip.AddrFromSlice(rAddr.IP)
 			rAddrPort := netip.AddrPortFrom(rAddrIp, uint16(rAddr.Port))
 
-			if ipv4LoopBack.Contains(rAddrIp) {
-				conn.Close()
-
-				continue
-			}
-
 			if D.ShouldHijackDns(dnsAddr, rAddrPort) {
 				go func() {
 					log.Debugln("[TUN] hijack dns tcp: %s", rAddrPort.String())
@@ -149,12 +141,6 @@ func New(device device.Device, dnsHijack []netip.AddrPort, tunAddress netip.Pref
 			rAddrIp, _ := netip.AddrFromSlice(rAddr.IP)
 			rAddrPort := netip.AddrPortFrom(rAddrIp, uint16(rAddr.Port))
 
-			if ipv4LoopBack.Contains(rAddrIp) {
-				pool.Put(buf)
-
-				continue
-			}
-
 			if D.ShouldHijackDns(dnsAddr, rAddrPort) {
 				go func() {
 					defer pool.Put(buf)

listener/tun/tun_adapter.go

@@ -13,6 +13,7 @@ import (
 	"github.com/Dreamacro/clash/listener/tun/ipstack"
 	"github.com/Dreamacro/clash/listener/tun/ipstack/commons"
 	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/option"
 	"github.com/Dreamacro/clash/listener/tun/ipstack/system"
 	"github.com/Dreamacro/clash/log"
 	"net/netip"
@@ -72,7 +73,7 @@ func New(tunConf *config.Tun, dnsConf *config.DNS, tcpIn chan<- C.ConnContext, u
 				DNSAdds: tunConf.DNSHijack,
 				TCPIn:   tcpIn, UDPIn: udpIn,
 			},
-			gvisor.WithDefault(),
+			option.WithDefault(),
 		)
 
 		if err != nil {

main.go

@@ -106,13 +106,9 @@ func main() {
 		log.Fatalln("Parse config error: %s", err.Error())
 	}
 
+	defer executor.Shutdown()
+
 	sigCh := make(chan os.Signal, 1)
 	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
 	<-sigCh
-
-	// cleanup
-	log.Warnln("Clash cleanup")
-	hub.Cleanup()
-
-	log.Warnln("Clash shutting down")
 }