Merge remote-tracking branch 'yaling888/with-tun' into Alpha

# Conflicts:
#	.github/workflows/codeql-analysis.yml
#	.github/workflows/linter.yml
#	.github/workflows/release.yml
#	Makefile
#	README.md
#	adapter/outbound/vless.go
#	component/geodata/memconservative/cache.go
#	component/geodata/router/condition.go
#	component/geodata/router/condition_geoip.go
#	component/geodata/standard/standard.go
#	component/geodata/utils.go
#	config/config.go
#	config/initial.go
#	constant/metadata.go
#	constant/path.go
#	constant/rule.go
#	constant/rule_extra.go
#	dns/client.go
#	dns/filters.go
#	dns/resolver.go
#	go.mod
#	go.sum
#	hub/executor/executor.go
#	hub/route/configs.go
#	listener/listener.go
#	listener/tproxy/tproxy_linux_iptables.go
#	listener/tun/dev/dev.go
#	listener/tun/dev/dev_darwin.go
#	listener/tun/dev/dev_linux.go
#	listener/tun/dev/dev_windows.go
#	listener/tun/dev/wintun/config.go
#	listener/tun/dev/wintun/dll_windows.go
#	listener/tun/dev/wintun/session_windows.go
#	listener/tun/dev/wintun/wintun_windows.go
#	listener/tun/ipstack/commons/dns.go
#	listener/tun/ipstack/gvisor/tun.go
#	listener/tun/ipstack/gvisor/tundns.go
#	listener/tun/ipstack/gvisor/utils.go
#	listener/tun/ipstack/stack_adapter.go
#	listener/tun/ipstack/system/dns.go
#	listener/tun/ipstack/system/tcp.go
#	listener/tun/ipstack/system/tun.go
#	listener/tun/tun_adapter.go
#	main.go
#	rule/common/base.go
#	rule/common/domain.go
#	rule/common/domain_keyword.go
#	rule/common/domain_suffix.go
#	rule/common/final.go
#	rule/common/geoip.go
#	rule/common/geosite.go
#	rule/common/ipcidr.go
#	rule/common/port.go
#	rule/parser.go
#	rule/process.go
#	test/go.mod
#	test/go.sum
#	transport/vless/xtls.go
#	tunnel/tunnel.go

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,29 @@
+name: CodeQL
+
+on:
+  push:
+    branches: [ rm ]
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ['go']
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.github/workflows/linter.yml

@@ -0,0 +1,27 @@
+name: Linter
+on: [push, pull_request]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Get latest go version
+        id: version
+        run: |
+          echo ::set-output name=go_version::$(curl -s https://raw.githubusercontent.com/actions/go-versions/main/versions-manifest.json | grep -oE '"version": "[0-9]{1}.[0-9]{1,}(.[0-9]{1,})?"' | head -1 | cut -d':' -f2 | sed 's/ //g; s/"//g')
+
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        #with:
+        #  go-version: ${{ steps.version.outputs.go_version }}
+        with:
+          go-version: 1.18.x
+
+      - name: golangci-lint
+        #uses: golangci/golangci-lint-action@v3
+        #with:
+        #  version: latest
+        run: |
+          go install github.com/golangci/golangci-lint/cmd/golangci-lint@ec95236
+          golangci-lint run ./...

.golangci.yaml

@@ -4,7 +4,9 @@ linters:
     - gofumpt
     - staticcheck
     - govet
-    - gci
+#    - gci
+    - gofmt
+    - goimports
 
 linters-settings:
   gci:

Makefile

@@ -14,7 +14,7 @@ PLATFORM_LIST = \
 	linux-armv5 \
 	linux-armv6 \
 	linux-armv7 \
-	linux-armv8 \
+	linux-arm64 \
 	linux-mips64 \
 	linux-mips64le \
 	linux-mips-softfloat \
@@ -26,20 +26,15 @@ PLATFORM_LIST = \
 	freebsd-amd64 \
 	freebsd-arm64
 
-
 WINDOWS_ARCH_LIST = \
 	windows-386 \
 	windows-amd64 \
 	windows-arm64 \
     windows-arm32v7
 
-
+all:linux-amd64 linux-arm64\
-all:linux-amd64\
-	linux-armv7\
 	darwin-amd64 darwin-arm64\
- 	windows-amd64 windows-386 \
+ 	windows-amd64 windows-arm64 \
- 	linux-mips-hardfloat linux-mips-softfloat linux-mips64 linux-mips64le linux-mipsle-hardfloat linux-mipsle-softfloat# Most used
-
 docker:
 	GOAMD64=v3 $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
@@ -55,9 +50,6 @@ linux-386:
 linux-amd64:
 	GOARCH=amd64 GOOS=linux GOAMD64=v3 $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
-linux-amd64-AutoIptables:
-	GOARCH=amd64 GOOS=linux $(GOBUILDOP) -o $(BINDIR)/$(NAME)-$@
-
 linux-arm64:
 	GOARCH=arm64 GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
@@ -70,7 +62,7 @@ linux-armv6:
 linux-armv7:
 	GOARCH=arm GOOS=linux GOARM=7 $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
-linux-armv8:
+linux-arm64:
 	GOARCH=arm64 GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
 linux-mips-softfloat:
@@ -91,7 +83,7 @@ linux-mips64:
 linux-mips64le:
 	GOARCH=mips64le GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
-android-armv8:
+android-arm64:
 	GOARCH=arm64 GOOS=android $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
 freebsd-386:
@@ -128,5 +120,12 @@ $(zip_releases): %.zip : %
 all-arch: $(PLATFORM_LIST) $(WINDOWS_ARCH_LIST)
 
 releases: $(gz_releases) $(zip_releases)
+
+vet:
+	go vet ./...
+
+lint:
+	golangci-lint run ./...
+
 clean:
 	rm $(BINDIR)/*

adapter/outbound/vless.go

@@ -17,6 +17,7 @@ import (
 	"github.com/Dreamacro/clash/transport/gun"
 	"github.com/Dreamacro/clash/transport/vless"
 	"github.com/Dreamacro/clash/transport/vmess"
+
 	"golang.org/x/net/http2"
 )
 

adapter/outbound/vmess.go

@@ -47,6 +47,10 @@ type VmessOption struct {
 	HTTP2Opts      HTTP2Options `proxy:"h2-opts,omitempty"`
 	GrpcOpts       GrpcOptions  `proxy:"grpc-opts,omitempty"`
 	WSOpts         WSOptions    `proxy:"ws-opts,omitempty"`
+
+	// TODO: compatible with VMESS WS older version configurations
+	WSHeaders map[string]string `proxy:"ws-headers,omitempty"`
+	WSPath    string            `proxy:"ws-path,omitempty"`
 }
 
 type HTTPOptions struct {
@@ -76,6 +80,13 @@ func (v *Vmess) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 	var err error
 	switch v.option.Network {
 	case "ws":
+		if v.option.WSOpts.Path == "" {
+			v.option.WSOpts.Path = v.option.WSPath
+		}
+		if len(v.option.WSOpts.Headers) == 0 {
+			v.option.WSOpts.Headers = v.option.WSHeaders
+		}
+
 		host, port, _ := net.SplitHostPort(v.addr)
 		wsOpts := &vmess.WebsocketConfig{
 			Host:                host,

common/cmd/cmd.go

@@ -0,0 +1,35 @@
+package cmd
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+func ExecCmd(cmdStr string) (string, error) {
+	args := splitArgs(cmdStr)
+
+	var cmd *exec.Cmd
+	if len(args) == 1 {
+		cmd = exec.Command(args[0])
+	} else {
+		cmd = exec.Command(args[0], args[1:]...)
+	}
+
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return "", fmt.Errorf("%v, %s", err, string(out))
+	}
+	return string(out), nil
+}
+
+func splitArgs(cmd string) []string {
+	args := strings.Split(cmd, " ")
+
+	// use in pipeline
+	if len(args) > 2 && strings.ContainsAny(cmd, "|") {
+		suffix := strings.Join(args[2:], " ")
+		args = append(args[:2], suffix)
+	}
+	return args
+}

common/cmd/cmd_test.go

@@ -0,0 +1,40 @@
+package cmd
+
+import (
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSplitArgs(t *testing.T) {
+	args := splitArgs("ls")
+	args1 := splitArgs("ls -la")
+	args2 := splitArgs("bash -c ls")
+	args3 := splitArgs("bash -c ls -lahF | grep 'cmd'")
+
+	assert.Equal(t, 1, len(args))
+	assert.Equal(t, 2, len(args1))
+	assert.Equal(t, 3, len(args2))
+	assert.Equal(t, 3, len(args3))
+}
+
+func TestExecCmd(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		_, err := ExecCmd("dir")
+		assert.Nil(t, err)
+		return
+	}
+
+	_, err := ExecCmd("ls")
+	_, err1 := ExecCmd("ls -la")
+	_, err2 := ExecCmd("bash -c ls")
+	_, err3 := ExecCmd("bash -c ls -la")
+	_, err4 := ExecCmd("bash -c ls -la | grep 'cmd'")
+
+	assert.Nil(t, err)
+	assert.Nil(t, err1)
+	assert.Nil(t, err2)
+	assert.Nil(t, err3)
+	assert.Nil(t, err4)
+}

component/dialer/resolver.go

@@ -0,0 +1,28 @@
+package dialer
+
+import (
+	"context"
+	"net"
+)
+
+func init() {
+	// We must use this DialContext to query DNS
+	// when using net default resolver.
+	net.DefaultResolver.PreferGo = true
+	net.DefaultResolver.Dial = resolverDialContext
+}
+
+func resolverDialContext(ctx context.Context, network, address string) (net.Conn, error) {
+	d := &net.Dialer{}
+
+	interfaceName := DefaultInterface.Load()
+
+	if interfaceName != "" {
+		dstIP := net.ParseIP(address)
+		if dstIP != nil {
+			bindIfaceToDialer(interfaceName, d, network, dstIP)
+		}
+	}
+
+	return d.DialContext(ctx, network, address)
+}

component/fakeip/pool.go

@@ -25,6 +25,7 @@ type Pool struct {
 	max       uint32
 	min       uint32
 	gateway   uint32
+	broadcast uint32
 	offset    uint32
 	mux       sync.Mutex
 	host      *trie.DomainTrie
@@ -82,6 +83,11 @@ func (p *Pool) Gateway() net.IP {
 	return uintToIP(p.gateway)
 }
 
+// Broadcast return broadcast ip
+func (p *Pool) Broadcast() net.IP {
+	return uintToIP(p.broadcast)
+}
+
 // IPNet return raw ipnet
 func (p *Pool) IPNet() *net.IPNet {
 	return p.ipnet
@@ -144,7 +150,7 @@ func New(options Options) (*Pool, error) {
 	min := ipToUint(options.IPNet.IP) + 2
 
 	ones, bits := options.IPNet.Mask.Size()
-	total := 1<<uint(bits-ones) - 2
+	total := 1<<uint(bits-ones) - 3
 
 	if total <= 0 {
 		return nil, errors.New("ipnet don't have valid ip")
@@ -155,6 +161,7 @@ func New(options Options) (*Pool, error) {
 		min:       min,
 		max:       max,
 		gateway:   min - 1,
+		broadcast: max + 1,
 		host:      options.Host,
 		ipnet:     options.IPNet,
 	}

component/fakeip/pool_test.go

@@ -87,7 +87,7 @@ func TestPool_CycleUsed(t *testing.T) {
 	for _, pool := range pools {
 		foo := pool.Lookup("foo.com")
 		bar := pool.Lookup("bar.com")
-		for i := 0; i < 3; i++ {
+		for i := 0; i < 2; i++ {
 			pool.Lookup(fmt.Sprintf("%d.com", i))
 		}
 		baz := pool.Lookup("baz.com")

component/geodata/router/condition_geoip.go

@@ -1,243 +0,0 @@
-package router
-
-import (
-	"encoding/binary"
-	"fmt"
-	"net"
-	"sort"
-)
-
-// CIDRList is an alias of []*CIDR to provide sort.Interface.
-type CIDRList []*CIDR
-
-// Len implements sort.Interface.
-func (l *CIDRList) Len() int {
-	return len(*l)
-}
-
-// Less implements sort.Interface.
-func (l *CIDRList) Less(i int, j int) bool {
-	ci := (*l)[i]
-	cj := (*l)[j]
-
-	if len(ci.Ip) < len(cj.Ip) {
-		return true
-	}
-
-	if len(ci.Ip) > len(cj.Ip) {
-		return false
-	}
-
-	for k := 0; k < len(ci.Ip); k++ {
-		if ci.Ip[k] < cj.Ip[k] {
-			return true
-		}
-
-		if ci.Ip[k] > cj.Ip[k] {
-			return false
-		}
-	}
-
-	return ci.Prefix < cj.Prefix
-}
-
-// Swap implements sort.Interface.
-func (l *CIDRList) Swap(i int, j int) {
-	(*l)[i], (*l)[j] = (*l)[j], (*l)[i]
-}
-
-type ipv6 struct {
-	a uint64
-	b uint64
-}
-
-type GeoIPMatcher struct {
-	countryCode  string
-	reverseMatch bool
-	ip4          []uint32
-	prefix4      []uint8
-	ip6          []ipv6
-	prefix6      []uint8
-}
-
-func normalize4(ip uint32, prefix uint8) uint32 {
-	return (ip >> (32 - prefix)) << (32 - prefix)
-}
-
-func normalize6(ip ipv6, prefix uint8) ipv6 {
-	if prefix <= 64 {
-		ip.a = (ip.a >> (64 - prefix)) << (64 - prefix)
-		ip.b = 0
-	} else {
-		ip.b = (ip.b >> (128 - prefix)) << (128 - prefix)
-	}
-	return ip
-}
-
-func (m *GeoIPMatcher) Init(cidrs []*CIDR) error {
-	ip4Count := 0
-	ip6Count := 0
-
-	for _, cidr := range cidrs {
-		ip := cidr.Ip
-		switch len(ip) {
-		case 4:
-			ip4Count++
-		case 16:
-			ip6Count++
-		default:
-			return fmt.Errorf("unexpect ip length: %d", len(ip))
-		}
-	}
-
-	cidrList := CIDRList(cidrs)
-	sort.Sort(&cidrList)
-
-	m.ip4 = make([]uint32, 0, ip4Count)
-	m.prefix4 = make([]uint8, 0, ip4Count)
-	m.ip6 = make([]ipv6, 0, ip6Count)
-	m.prefix6 = make([]uint8, 0, ip6Count)
-
-	for _, cidr := range cidrs {
-		ip := cidr.Ip
-		prefix := uint8(cidr.Prefix)
-		switch len(ip) {
-		case 4:
-			m.ip4 = append(m.ip4, normalize4(binary.BigEndian.Uint32(ip), prefix))
-			m.prefix4 = append(m.prefix4, prefix)
-		case 16:
-			ip6 := ipv6{
-				a: binary.BigEndian.Uint64(ip[0:8]),
-				b: binary.BigEndian.Uint64(ip[8:16]),
-			}
-			ip6 = normalize6(ip6, prefix)
-
-			m.ip6 = append(m.ip6, ip6)
-			m.prefix6 = append(m.prefix6, prefix)
-		}
-	}
-
-	return nil
-}
-
-func (m *GeoIPMatcher) SetReverseMatch(isReverseMatch bool) {
-	m.reverseMatch = isReverseMatch
-}
-
-func (m *GeoIPMatcher) match4(ip uint32) bool {
-	if len(m.ip4) == 0 {
-		return false
-	}
-
-	if ip < m.ip4[0] {
-		return false
-	}
-
-	size := uint32(len(m.ip4))
-	l := uint32(0)
-	r := size
-	for l < r {
-		x := ((l + r) >> 1)
-		if ip < m.ip4[x] {
-			r = x
-			continue
-		}
-
-		nip := normalize4(ip, m.prefix4[x])
-		if nip == m.ip4[x] {
-			return true
-		}
-
-		l = x + 1
-	}
-
-	return l > 0 && normalize4(ip, m.prefix4[l-1]) == m.ip4[l-1]
-}
-
-func less6(a ipv6, b ipv6) bool {
-	return a.a < b.a || (a.a == b.a && a.b < b.b)
-}
-
-func (m *GeoIPMatcher) match6(ip ipv6) bool {
-	if len(m.ip6) == 0 {
-		return false
-	}
-
-	if less6(ip, m.ip6[0]) {
-		return false
-	}
-
-	size := uint32(len(m.ip6))
-	l := uint32(0)
-	r := size
-	for l < r {
-		x := (l + r) / 2
-		if less6(ip, m.ip6[x]) {
-			r = x
-			continue
-		}
-
-		if normalize6(ip, m.prefix6[x]) == m.ip6[x] {
-			return true
-		}
-
-		l = x + 1
-	}
-
-	return l > 0 && normalize6(ip, m.prefix6[l-1]) == m.ip6[l-1]
-}
-
-// Match returns true if the given ip is included by the GeoIP.
-func (m *GeoIPMatcher) Match(ip net.IP) bool {
-	switch len(ip) {
-	case 4:
-		if m.reverseMatch {
-			return !m.match4(binary.BigEndian.Uint32(ip))
-		}
-		return m.match4(binary.BigEndian.Uint32(ip))
-	case 16:
-		if m.reverseMatch {
-			return !m.match6(ipv6{
-				a: binary.BigEndian.Uint64(ip[0:8]),
-				b: binary.BigEndian.Uint64(ip[8:16]),
-			})
-		}
-		return m.match6(ipv6{
-			a: binary.BigEndian.Uint64(ip[0:8]),
-			b: binary.BigEndian.Uint64(ip[8:16]),
-		})
-	default:
-		return false
-	}
-}
-
-// GeoIPMatcherContainer is a container for GeoIPMatchers. It keeps unique copies of GeoIPMatcher by country code.
-type GeoIPMatcherContainer struct {
-	matchers []*GeoIPMatcher
-}
-
-// Add adds a new GeoIP set into the container.
-// If the country code of GeoIP is not empty, GeoIPMatcherContainer will try to find an existing one, instead of adding a new one.
-func (c *GeoIPMatcherContainer) Add(geoip *GeoIP) (*GeoIPMatcher, error) {
-	if len(geoip.CountryCode) > 0 {
-		for _, m := range c.matchers {
-			if m.countryCode == geoip.CountryCode && m.reverseMatch == geoip.ReverseMatch {
-				return m, nil
-			}
-		}
-	}
-
-	m := &GeoIPMatcher{
-		countryCode:  geoip.CountryCode,
-		reverseMatch: geoip.ReverseMatch,
-	}
-	if err := m.Init(geoip.Cidr); err != nil {
-		return nil, err
-	}
-	if len(geoip.CountryCode) > 0 {
-		c.matchers = append(c.matchers, m)
-	}
-	return m, nil
-}
-
-var globalGeoIPContainer GeoIPMatcherContainer

component/geodata/standard/standard.go

@@ -9,6 +9,7 @@ import (
 	"github.com/Dreamacro/clash/component/geodata"
 	"github.com/Dreamacro/clash/component/geodata/router"
 	C "github.com/Dreamacro/clash/constant"
+
 	"google.golang.org/protobuf/proto"
 )
 

component/pool/pool_test.go

@@ -34,7 +34,7 @@ func TestPool_MaxSize(t *testing.T) {
 	size := 5
 	pool := New(g, WithSize(size))
 
-	items := []any{}
+	var items []any
 
 	for i := 0; i < size; i++ {
 		item, _ := pool.Get()

component/process/process.go

@@ -3,6 +3,8 @@ package process
 import (
 	"errors"
 	"net"
+
+	C "github.com/Dreamacro/clash/constant"
 )
 
 var (
@@ -19,3 +21,49 @@ const (
 func FindProcessName(network string, srcIP net.IP, srcPort int) (string, error) {
 	return findProcessName(network, srcIP, srcPort)
 }
+
+func ShouldFindProcess(metadata *C.Metadata) bool {
+	if metadata.Process != "" {
+		return false
+	}
+	for _, ip := range localIPs {
+		if ip.Equal(metadata.SrcIP) {
+			return true
+		}
+	}
+	return false
+}
+
+func AppendLocalIPs(ip ...net.IP) {
+	localIPs = append(ip, localIPs...)
+}
+
+func getLocalIPs() []net.IP {
+	ips := []net.IP{net.IPv4zero, net.IPv6zero}
+
+	netInterfaces, err := net.Interfaces()
+	if err != nil {
+		ips = append(ips, net.IPv4(127, 0, 0, 1), net.IPv6loopback)
+		return ips
+	}
+
+	for i := 0; i < len(netInterfaces); i++ {
+		if (netInterfaces[i].Flags & net.FlagUp) != 0 {
+			adds, _ := netInterfaces[i].Addrs()
+
+			for _, address := range adds {
+				if ipNet, ok := address.(*net.IPNet); ok {
+					ips = append(ips, ipNet.IP)
+				}
+			}
+		}
+	}
+
+	return ips
+}
+
+var localIPs []net.IP
+
+func init() {
+	localIPs = getLocalIPs()
+}

component/process/process_darwin.go

@@ -69,7 +69,7 @@ func findProcessName(network string, ip net.IP, port int) (string, error) {
 			continue
 		}
 
-		if !ip.Equal(srcIP) {
+		if !ip.Equal(srcIP) && (network == TCP || !srcIP.IsUnspecified()) {
 			continue
 		}
 

component/resolver/enhancer.go

@@ -10,6 +10,7 @@ type Enhancer interface {
 	FakeIPEnabled() bool
 	MappingEnabled() bool
 	IsFakeIP(net.IP) bool
+	IsFakeBroadcastIP(net.IP) bool
 	IsExistFakeIP(net.IP) bool
 	FindHostByIP(net.IP) (string, bool)
 }
@@ -38,6 +39,14 @@ func IsFakeIP(ip net.IP) bool {
 	return false
 }
 
+func IsFakeBroadcastIP(ip net.IP) bool {
+	if mapper := DefaultHostMapper; mapper != nil {
+		return mapper.IsFakeBroadcastIP(ip)
+	}
+
+	return false
+}
+
 func IsExistFakeIP(ip net.IP) bool {
 	if mapper := DefaultHostMapper; mapper != nil {
 		return mapper.IsExistFakeIP(ip)

config/config.go

@@ -7,6 +7,7 @@ import (
 	R "github.com/Dreamacro/clash/rule"
 	RP "github.com/Dreamacro/clash/rule/provider"
 	"net"
+	"net/netip"
 	"net/url"
 	"os"
 	"regexp"
@@ -19,6 +20,7 @@ import (
 	"github.com/Dreamacro/clash/adapter/outboundgroup"
 	"github.com/Dreamacro/clash/adapter/provider"
 	"github.com/Dreamacro/clash/component/auth"
+	"github.com/Dreamacro/clash/component/dialer"
 	"github.com/Dreamacro/clash/component/fakeip"
 	"github.com/Dreamacro/clash/component/geodata"
 	"github.com/Dreamacro/clash/component/geodata/router"
@@ -26,6 +28,7 @@ import (
 	C "github.com/Dreamacro/clash/constant"
 	providerTypes "github.com/Dreamacro/clash/constant/provider"
 	"github.com/Dreamacro/clash/dns"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/commons"
 	"github.com/Dreamacro/clash/log"
 	T "github.com/Dreamacro/clash/tunnel"
 
@@ -47,7 +50,7 @@ type General struct {
 	AutoIptables  bool         `json:"auto-iptables"`
 }
 
-// Inbound
+// Inbound config
 type Inbound struct {
 	Port           int      `json:"port"`
 	SocksPort      int      `json:"socks-port"`
@@ -59,7 +62,7 @@ type Inbound struct {
 	BindAddress    string   `json:"bind-address"`
 }
 
-// Controller
+// Controller config
 type Controller struct {
 	ExternalController string `json:"-"`
 	ExternalUI         string `json:"-"`
@@ -105,8 +108,9 @@ type Profile struct {
 // Tun config
 type Tun struct {
 	Enable    bool             `yaml:"enable" json:"enable"`
-	Stack     string   `yaml:"stack" json:"stack"`
+	Device    string           `yaml:"device" json:"device"`
-	DnsHijack []string `yaml:"dns-hijack" json:"dns-hijack"`
+	Stack     C.TUNStack       `yaml:"stack" json:"stack"`
+	DNSHijack []netip.AddrPort `yaml:"dns-hijack" json:"dns-hijack"`
 	AutoRoute bool             `yaml:"auto-route" json:"auto-route"`
 }
 
@@ -157,6 +161,14 @@ type RawFallbackFilter struct {
 	GeoSite   []string `yaml:"geosite"`
 }
 
+type RawTun struct {
+	Enable    bool       `yaml:"enable" json:"enable"`
+	Device    string     `yaml:"device" json:"device"`
+	Stack     C.TUNStack `yaml:"stack" json:"stack"`
+	DNSHijack []string   `yaml:"dns-hijack" json:"dns-hijack"`
+	AutoRoute bool       `yaml:"auto-route" json:"auto-route"`
+}
+
 type RawConfig struct {
 	Port               int          `yaml:"port"`
 	SocksPort          int          `yaml:"socks-port"`
@@ -179,11 +191,11 @@ type RawConfig struct {
 	GeodataLoader      string       `yaml:"geodata-loader"`
 	AutoIptables       bool         `yaml:"auto-iptables"`
 
-	ProxyProvider map[string]map[string]interface{} `yaml:"proxy-providers"`
+	ProxyProvider map[string]map[string]any `yaml:"proxy-providers"`
-	RuleProvider  map[string]map[string]interface{} `yaml:"rule-providers"`
+	RuleProvider  map[string]map[string]any `yaml:"rule-providers"`
 	Hosts         map[string]string         `yaml:"hosts"`
 	DNS           RawDNS                    `yaml:"dns"`
-	Tun           Tun                               `yaml:"tun"`
+	Tun           RawTun                    `yaml:"tun"`
 	Experimental  Experimental              `yaml:"experimental"`
 	Profile       Profile                   `yaml:"profile"`
 	Proxy         []map[string]any          `yaml:"proxies"`
@@ -218,15 +230,26 @@ func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
 		Rule:           []string{},
 		Proxy:          []map[string]any{},
 		ProxyGroup:     []map[string]any{},
-		Tun: Tun{
+		Tun: RawTun{
 			Enable:    false,
-			Stack:     "gvisor",
+			Device:    "",
-			DnsHijack: []string{"198.18.0.2:53"},
+			Stack:     C.TunGvisor,
+			DNSHijack: []string{"198.18.0.2:53"}, // default hijack all dns query
+			AutoRoute: true,
+		},
+		Proxy:          []map[string]any{},
+		ProxyGroup:     []map[string]any{},
+		Tun: RawTun{
+			Enable:    false,
+			Device:    "",
+			Stack:     C.TunGvisor,
+			DNSHijack: []string{"0.0.0.0:53"}, // default hijack all dns query
 			AutoRoute: true,
 		},
 		DNS: RawDNS{
 			Enable:       false,
 			UseHosts:     true,
+			EnhancedMode: C.DNSMapping,
 			FakeIPRange:  "198.18.0.1/16",
 			FallbackFilter: RawFallbackFilter{
 				GeoIP:     true,
@@ -243,6 +266,8 @@ func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
 			NameServer: []string{
 				"223.5.5.5",
 				"119.29.29.29",
+				"https://doh.pub/dns-query",
+				"tls://223.5.5.5:853",
 			},
 			FakeIPFilter: []string{
 				"dns.msftnsci.com",
@@ -279,7 +304,13 @@ func ParseRawConfig(rawCfg *RawConfig) (*Config, error) {
 	}
 	config.General = general
 
-	config.Tun = &rawCfg.Tun
+	tunCfg, err := parseTun(rawCfg.Tun, config.General)
+	if err != nil {
+		return nil, err
+	}
+	config.Tun = tunCfg
+
+	dialer.DefaultInterface.Store(config.General.Interface)
 
 	proxies, providers, err := parseProxies(rawCfg)
 	if err != nil {
@@ -361,13 +392,14 @@ func parseGeneral(cfg *RawConfig) (*General, error) {
 func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[string]providerTypes.ProxyProvider, err error) {
 	proxies = make(map[string]C.Proxy)
 	providersMap = make(map[string]providerTypes.ProxyProvider)
-	var proxyList []string
-	_proxiesList := list.New()
-	_groupsList := list.New()
 	proxiesConfig := cfg.Proxy
 	groupsConfig := cfg.ProxyGroup
 	providersConfig := cfg.ProxyProvider
 
+	var proxyList []string
+	_proxiesList := list.New()
+	_groupsList := list.New()
+
 	proxies["DIRECT"] = adapter.NewProxy(outbound.NewDirect())
 	proxies["REJECT"] = adapter.NewProxy(outbound.NewReject())
 	proxies["COMPATIBLE"] = adapter.NewProxy(outbound.NewCompatible())
@@ -417,6 +449,13 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 		providersMap[name] = pd
 	}
 
+	for _, proxyProvider := range providersMap {
+		log.Infoln("Start initial provider %s", proxyProvider.Name())
+		if err := proxyProvider.Initial(); err != nil {
+			return nil, nil, fmt.Errorf("initial proxy provider %s error: %w", proxyProvider.Name(), err)
+		}
+	}
+
 	// parse proxy group
 	for idx, mapping := range groupsConfig {
 		group, err := outboundgroup.ParseProxyGroup(mapping, proxies, providersMap)
@@ -444,7 +483,7 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 		}
 	}
 
-	ps := []C.Proxy{}
+	var ps []C.Proxy
 	for _, v := range proxyList {
 		ps = append(ps, proxies[v])
 	}
@@ -543,28 +582,27 @@ func parseRules(cfg *RawConfig, proxies map[string]C.Proxy) ([]C.Rule, map[strin
 			continue
 		}
 
+		l := len(rule)
+
 		if ruleName == "NOT" || ruleName == "OR" || ruleName == "AND" {
-			payload = strings.Join(rule[1:len(rule)-1], ",")
+			target = rule[l-1]
-			target = rule[len(rule)-1]
+			payload = strings.Join(rule[1:l-1], ",")
 		} else {
-			switch l := len(rule); {
+			if l < 2 {
-			case l == 2:
+				return nil, fmt.Errorf("rules[%d] [%s] error: format invalid", idx, line)
-				target = rule[1]
-			case l == 3:
-				if ruleName == "MATCH" {
-					payload = ""
-					target = rule[1]
-					params = rule[2:]
-					break
 			}
+			if l < 4 {
+				rule = append(rule, make([]string, 4-l)...)
+			}
+			if ruleName == "MATCH" {
+				l = 2
+			}
+			if l >= 3 {
+				l = 3
 				payload = rule[1]
-				target = rule[2]
+			}
-			case l >= 4:
+			target = rule[l-1]
-				payload = rule[1]
+			params = rule[l:]
-				target = rule[2]
-				params = rule[3:]
-			default:
-				return nil, nil, fmt.Errorf("rules[%d] [%s] error: format invalid", idx, line)
 			}
 		}
 
@@ -681,6 +719,7 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 				Net:          dnsNetType,
 				Addr:         addr,
 				ProxyAdapter: u.Fragment,
+				Interface:    dialer.DefaultInterface.Load(),
 			},
 		)
 	}
@@ -879,3 +918,37 @@ func cleanPyKeywords(code string) string {
 	}
 	return code
 }
+
+func parseTun(rawTun RawTun, general *General) (*Tun, error) {
+	if (rawTun.Enable || general.TProxyPort != 0) && general.Interface == "" {
+		autoDetectInterfaceName, err := commons.GetAutoDetectInterface()
+		if err != nil || autoDetectInterfaceName == "" {
+			return nil, fmt.Errorf("can not find auto detect interface: %w. you must be detect `interface-name` if tun set to enable or `tproxy-port` isn't zore", err)
+		}
+
+		general.Interface = autoDetectInterfaceName
+	}
+
+	var dnsHijack []netip.AddrPort
+
+	for _, d := range rawTun.DNSHijack {
+		if _, after, ok := strings.Cut(d, "://"); ok {
+			d = after
+		}
+
+		addrPort, err := netip.ParseAddrPort(d)
+		if err != nil {
+			return nil, fmt.Errorf("parse dns-hijack url error: %w", err)
+		}
+
+		dnsHijack = append(dnsHijack, addrPort)
+	}
+
+	return &Tun{
+		Enable:    rawTun.Enable,
+		Device:    rawTun.Device,
+		Stack:     rawTun.Stack,
+		DNSHijack: dnsHijack,
+		AutoRoute: rawTun.AutoRoute,
+	}, nil
+}

config/initial.go

@@ -67,7 +67,7 @@ func downloadGeoSite(path string) (err error) {
 
 func initGeoSite() error {
 	if _, err := os.Stat(C.Path.GeoSite()); os.IsNotExist(err) {
-		log.Infoln("Need GeoSite but can't find GeoSite.dat, start download")
+		log.Infoln("Can't find GeoSite.dat, start download")
 		if err := downloadGeoSite(C.Path.GeoSite()); err != nil {
 			return fmt.Errorf("can't download GeoSite.dat: %s", err.Error())
 		}
@@ -90,7 +90,7 @@ func initGeoSite() error {
 func initGeoIP() error {
 	if C.GeodataMode {
 		if _, err := os.Stat(C.Path.GeoIP()); os.IsNotExist(err) {
-			log.Infoln("Need GeoIP but can't find GeoIP.dat, start download")
+			log.Infoln("Can't find GeoIP.dat, start download")
 			if err := downloadGeoIP(C.Path.GeoIP()); err != nil {
 				return fmt.Errorf("can't download GeoIP.dat: %s", err.Error())
 			}

constant/metadata.go

@@ -81,8 +81,8 @@ type Metadata struct {
 	DstPort     string  `json:"destinationPort"`
 	AddrType    int     `json:"-"`
 	Host        string  `json:"host"`
-	Process  string  `json:"process"`
 	DNSMode     DNSMode `json:"dnsMode"`
+	Process     string  `json:"process"`
 	ProcessPath string  `json:"processPath"`
 }
 

constant/rule.go

@@ -75,4 +75,5 @@ type Rule interface {
 	ShouldResolveIP() bool
 	ShouldFindProcess() bool
 	RuleExtra() *RuleExtra
+	SetRuleExtra(re *RuleExtra)
 }

constant/rule_extra.go

@@ -7,8 +7,6 @@ import (
 	"github.com/Dreamacro/clash/component/geodata/router"
 )
 
-var TunBroadcastAddr = net.IPv4(198, 18, 255, 255)
-
 type RuleExtra struct {
 	Network      NetWork
 	SourceIPs    []*net.IPNet

constant/tun.go

@@ -0,0 +1,66 @@
+package constant
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+)
+
+var StackTypeMapping = map[string]TUNStack{
+	strings.ToUpper(TunGvisor.String()): TunGvisor,
+	strings.ToUpper(TunSystem.String()): TunSystem,
+}
+
+const (
+	TunGvisor TUNStack = iota
+	TunSystem
+)
+
+type TUNStack int
+
+// UnmarshalYAML unserialize TUNStack with yaml
+func (e *TUNStack) UnmarshalYAML(unmarshal func(any) error) error {
+	var tp string
+	if err := unmarshal(&tp); err != nil {
+		return err
+	}
+	mode, exist := StackTypeMapping[strings.ToUpper(tp)]
+	if !exist {
+		return errors.New("invalid tun stack")
+	}
+	*e = mode
+	return nil
+}
+
+// MarshalYAML serialize TUNStack with yaml
+func (e TUNStack) MarshalYAML() (any, error) {
+	return e.String(), nil
+}
+
+// UnmarshalJSON unserialize TUNStack with json
+func (e *TUNStack) UnmarshalJSON(data []byte) error {
+	var tp string
+	json.Unmarshal(data, &tp)
+	mode, exist := StackTypeMapping[strings.ToUpper(tp)]
+	if !exist {
+		return errors.New("invalid tun stack")
+	}
+	*e = mode
+	return nil
+}
+
+// MarshalJSON serialize TUNStack with json
+func (e TUNStack) MarshalJSON() ([]byte, error) {
+	return json.Marshal(e.String())
+}
+
+func (e TUNStack) String() string {
+	switch e {
+	case TunGvisor:
+		return "gVisor"
+	case TunSystem:
+		return "System"
+	default:
+		return "unknown"
+	}
+}

dns/client.go

@@ -31,7 +31,6 @@ func (c *client) ExchangeContext(ctx context.Context, m *D.Msg) (*D.Msg, error)
 		ip  net.IP
 		err error
 	)
-
 	if ip = net.ParseIP(c.host); ip == nil {
 		if c.r == nil {
 			return nil, fmt.Errorf("dns %s not a valid ip", c.host)

dns/enhancer.go

@@ -40,7 +40,19 @@ func (h *ResolverEnhancer) IsFakeIP(ip net.IP) bool {
 	}
 
 	if pool := h.fakePool; pool != nil {
-		return pool.IPNet().Contains(ip) && !pool.Gateway().Equal(ip)
+		return pool.IPNet().Contains(ip) && !pool.Gateway().Equal(ip) && !pool.Broadcast().Equal(ip)
+	}
+
+	return false
+}
+
+func (h *ResolverEnhancer) IsFakeBroadcastIP(ip net.IP) bool {
+	if !h.FakeIPEnabled() {
+		return false
+	}
+
+	if pool := h.fakePool; pool != nil {
+		return pool.Broadcast().Equal(ip)
 	}
 
 	return false

dns/resolver.go

@@ -150,7 +150,7 @@ func (r *Resolver) exchangeWithoutCache(ctx context.Context, m *D.Msg) (msg *D.M
 	return
 }
 
-func (r *Resolver) batchExchange(ctx context.Context, clients []dnsClient, m *D.Msg) (*D.Msg, error) {
+func (r *Resolver) batchExchange(ctx context.Context, clients []dnsClient, m *D.Msg) (msg *D.Msg, err error) {
 	fast, ctx := picker.WithTimeout(ctx, resolver.DefaultDNSTimeout)
 	for _, client := range clients {
 		r := client
@@ -174,8 +174,8 @@ func (r *Resolver) batchExchange(ctx context.Context, clients []dnsClient, m *D.
 		return nil, err
 	}
 
-	msg := elm.(*D.Msg)
+	msg = elm.(*D.Msg)
-	return msg, nil
+	return
 }
 
 func (r *Resolver) matchPolicy(m *D.Msg) []dnsClient {
@@ -216,7 +216,7 @@ func (r *Resolver) shouldOnlyQueryFallback(m *D.Msg) bool {
 	return false
 }
 
-func (r *Resolver) ipExchange(ctx context.Context, m *D.Msg) (*D.Msg, error) {
+func (r *Resolver) ipExchange(ctx context.Context, m *D.Msg) (msg *D.Msg, err error) {
 	if matched := r.matchPolicy(m); len(matched) != 0 {
 		res := <-r.asyncExchange(ctx, matched, m)
 		return res.Msg, res.Error
@@ -233,20 +233,23 @@ func (r *Resolver) ipExchange(ctx context.Context, m *D.Msg) (*D.Msg, error) {
 
 	if r.fallback == nil || len(r.fallback) == 0 { // directly return if no fallback servers are available
 		res := <-msgCh
-		return res.Msg, res.Error
+		msg, err = res.Msg, res.Error
+		return
 	}
 
 	res := <-msgCh
 	if res.Error == nil {
 		if ips := msgToIP(res.Msg); len(ips) != 0 {
 			if !r.shouldIPFallback(ips[0]) {
-				return res.Msg, res.Error // no need to wait for fallback result
+				msg, err = res.Msg, res.Error // no need to wait for fallback result
+				return
 			}
 		}
 	}
 
 	res = <-r.asyncExchange(ctx, r.fallback, m)
-	return res.Msg, res.Error
+	msg, err = res.Msg, res.Error
+	return
 }
 
 func (r *Resolver) resolveIP(host string, dnsType uint16) (ip net.IP, err error) {

go.mod

@@ -11,14 +11,13 @@ require (
 	github.com/gofrs/uuid v4.2.0+incompatible
 	github.com/gorilla/websocket v1.5.0
 	github.com/insomniacslk/dhcp v0.0.0-20220119180841-3c283ff8b7dd
-	github.com/kr328/tun2socket v0.0.0-20210412191540-3d56c47e2d99
-	github.com/lucas-clemente/quic-go v0.25.0
 	github.com/miekg/dns v1.1.47
 	github.com/oschwald/geoip2-golang v1.6.1
 	github.com/sirupsen/logrus v1.8.1
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.7.1
 	github.com/xtls/go v0.0.0-20210920065950-d4af136d3672
 	go.etcd.io/bbolt v1.3.6
+	github.com/lucas-clemente/quic-go v0.25.0
 	go.uber.org/atomic v1.9.0
 	go.uber.org/automaxprocs v1.4.0
 	golang.org/x/crypto v0.0.0-20220315160706-3147a52a75dd
@@ -26,9 +25,13 @@ require (
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	golang.org/x/sys v0.0.0-20220315194320-039c03cc5b86
 	golang.zx2c4.com/wireguard/windows v0.5.1
+	golang.org/x/sys v0.0.0-20220315194320-039c03cc5b86
+	golang.org/x/time v0.0.0-20220224211638-0e9765cccd65
+	golang.zx2c4.com/wireguard v0.0.0-20220310012736-ae6bc4dd64e1
+	golang.zx2c4.com/wireguard/windows v0.5.3
 	google.golang.org/protobuf v1.27.1
 	gopkg.in/yaml.v2 v2.4.0
-	gvisor.dev/gvisor v0.0.0-20220129032118-ed00636ef990
+	gvisor.dev/gvisor v0.0.0-20220315202956-f1399ecf1672
 )
 
 require (
@@ -38,6 +41,8 @@ require (
 	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
 	github.com/google/btree v1.0.1 // indirect
 	github.com/kr/pretty v0.2.1 // indirect
+	github.com/oschwald/maxminddb-golang v1.8.0 // indirect
+	github.com/kr/pretty v0.2.1 // indirect
 	github.com/marten-seemann/qtls-go1-16 v0.1.4 // indirect
 	github.com/marten-seemann/qtls-go1-17 v0.1.0 // indirect
 	github.com/marten-seemann/qtls-go1-18 v0.1.0 // indirect
@@ -45,12 +50,17 @@ require (
 	github.com/onsi/ginkgo v1.16.5 // indirect
 	github.com/oschwald/maxminddb-golang v1.8.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/u-root/uio v0.0.0-20210528114334-82958018845c // indirect
+	golang.org/x/mod v0.5.1 // indirect
+	golang.org/x/text v0.3.8-0.20220124021120-d1c84af989ab // indirect
+	golang.org/x/tools v0.1.9 // indirect
 	github.com/u-root/uio v0.0.0-20220204230159-dac05f7d2cb4 // indirect
 	golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3 // indirect
 	golang.org/x/text v0.3.8-0.20211105212822-18b340fc7af2 // indirect
 	golang.org/x/time v0.0.0-20220224211638-0e9765cccd65 // indirect
 	golang.org/x/tools v0.1.10 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 // indirect
 	golang.zx2c4.com/go118/netip v0.0.0-20211106132939-9d41d90554dd // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect

hub/executor/executor.go

@@ -28,7 +28,7 @@ import (
 	"github.com/Dreamacro/clash/dns"
 	P "github.com/Dreamacro/clash/listener"
 	authStore "github.com/Dreamacro/clash/listener/auth"
-	"github.com/Dreamacro/clash/listener/tun/dev"
+	"github.com/Dreamacro/clash/listener/tproxy"
 	"github.com/Dreamacro/clash/log"
 	"github.com/Dreamacro/clash/tunnel"
 )
@@ -76,6 +76,8 @@ func ApplyConfig(cfg *config.Config, force bool) {
 	mux.Lock()
 	defer mux.Unlock()
 
+	log.SetLevel(log.DEBUG)
+
 	updateUsers(cfg.Users)
 	updateHosts(cfg.Hosts)
 	updateGeneral(cfg.General, cfg.Tun, force)
@@ -88,6 +90,7 @@ func ApplyConfig(cfg *config.Config, force bool) {
 	loadProvider(cfg.RuleProviders, cfg.Providers)
 	updateProfile(cfg)
 
+	log.SetLevel(cfg.General.LogLevel)
 }
 
 func GetGeneral() *config.General {
@@ -119,15 +122,7 @@ func GetGeneral() *config.General {
 
 func updateExperimental(c *config.Config) {}
 
-func updateDNS(c *config.DNS, Tun *config.Tun) {
+func updateDNS(c *config.DNS, t *config.Tun) {
-	if !c.Enable && !Tun.Enable {
-		resolver.DefaultResolver = nil
-		resolver.MainResolver = nil
-		resolver.DefaultHostMapper = nil
-		dns.ReCreateServer("", nil, nil)
-		return
-	}
-
 	cfg := dns.Config{
 		Main:         c.NameServer,
 		Fallback:     c.Fallback,
@@ -158,14 +153,21 @@ func updateDNS(c *config.DNS, Tun *config.Tun) {
 	resolver.DefaultResolver = r
 	resolver.MainResolver = mr
 	resolver.DefaultHostMapper = m
-	if Tun.Enable && !strings.EqualFold(Tun.Stack, "gVisor") {
+
+	if t.Enable {
 		resolver.DefaultLocalServer = dns.NewLocalServer(r, m)
-	} else {
-		resolver.DefaultLocalServer = nil
 	}
 
 	if c.Enable {
 		dns.ReCreateServer(c.Listen, r, m)
+	} else {
+		if !t.Enable {
+			resolver.DefaultResolver = nil
+			resolver.MainResolver = nil
+			resolver.DefaultHostMapper = nil
+			resolver.DefaultLocalServer = nil
+		}
+		dns.ReCreateServer("", nil, nil)
 	}
 }
 
@@ -213,33 +215,30 @@ func loadProvider(ruleProviders map[string]*provider.RuleProvider, proxyProvider
 	}
 }
 
+func updateTun(tun *config.Tun, tunAddressPrefix string) {
+	P.ReCreateTun(tun, tunAddressPrefix, tunnel.TCPIn(), tunnel.UDPIn())
+}
+
 func updateGeneral(general *config.General, Tun *config.Tun, force bool) {
 	tunnel.SetMode(general.Mode)
 	resolver.DisableIPv6 = !general.IPv6
 	adapter.UnifiedDelay.Store(general.UnifiedDelay)
 
-	if (Tun.Enable || general.TProxyPort != 0) && general.Interface == "" {
-		autoDetectInterfaceName, err := dev.GetAutoDetectInterface()
-		if err == nil {
-			if autoDetectInterfaceName != "" && autoDetectInterfaceName != "<nil>" {
-				general.Interface = autoDetectInterfaceName
-			} else {
-				log.Debugln("Auto detect interface name is empty.")
-			}
-		} else {
-			log.Debugln("Can not find auto detect interface. %s", err.Error())
-		}
-	}
-
 	dialer.DefaultInterface.Store(general.Interface)
-	dialer.DefaultRoutingMark.Store(int32(general.RoutingMark))
+	if dialer.DefaultInterface.Load() != "" {
-
 		log.Infoln("Use interface name: %s", general.Interface)
+	}
+
+	if general.RoutingMark > 0 || (general.RoutingMark == 0 && general.TProxyPort == 0) {
+		dialer.DefaultRoutingMark.Store(int32(general.RoutingMark))
+		if general.RoutingMark > 0 {
+			log.Infoln("Use routing mark: %#x", general.RoutingMark)
+		}
+	}
 
 	iface.FlushCache()
 
 	if !force {
-		log.SetLevel(general.LogLevel)
 		return
 	}
 
@@ -260,18 +259,6 @@ func updateGeneral(general *config.General, Tun *config.Tun, force bool) {
 	P.ReCreateRedir(general.RedirPort, tcpIn, udpIn)
 	P.ReCreateTProxy(general.TProxyPort, tcpIn, udpIn)
 	P.ReCreateMixed(general.MixedPort, tcpIn, udpIn)
-
-	log.SetLevel(general.LogLevel)
-}
-
-func updateTun(Tun *config.Tun) {
-	if Tun == nil {
-		return
-	}
-	tcpIn := tunnel.TCPIn()
-	udpIn := tunnel.UDPIn()
-
-	P.ReCreateTun(*Tun, tcpIn, udpIn)
 }
 
 func updateUsers(users []auth.AuthUser) {
@@ -317,8 +304,28 @@ func patchSelectGroup(proxies map[string]C.Proxy) {
 	}
 }
 
-func updateIPTables(dns *config.DNS, general *config.General, tun *config.Tun) {
+func updateIPTables(dns *config.DNS, tProxyPort int, interfaceName string, tunEnable bool) {
-	if runtime.GOOS != "linux" || dns.Listen == "" || general.TProxyPort == 0 || tun.Enable || !general.AutoIptables {
+	tproxy.CleanUpTProxyLinuxIPTables()
+
+	if runtime.GOOS != "linux" || tProxyPort == 0 {
+		return
+	}
+
+	var err error
+	defer func() {
+		if err != nil {
+			log.Errorln("Setting iptables failed: %s", err.Error())
+			os.Exit(2)
+		}
+	}()
+
+	if !dns.Enable || dns.Listen == "" {
+		err = fmt.Errorf("DNS server must be enable")
+		return
+	}
+
+	if tunEnable {
+		err = fmt.Errorf("TUN device must be disabe")
 		return
 	}
 
@@ -332,19 +339,15 @@ func updateIPTables(dns *config.DNS, general *config.General, tun *config.Tun) {
 		return
 	}
 
-	tproxy.CleanUpTProxyLinuxIPTables()
+	if dialer.DefaultRoutingMark.Load() == 0 {
 		dialer.DefaultRoutingMark.Store(2158)
-
-	err = tproxy.SetTProxyLinuxIPTables(general.Interface, general.TProxyPort, dnsPort)
-
-	if err != nil {
-		log.Errorln("Can not setting iptables for TProxy on linux, %s", err.Error())
-		os.Exit(2)
 	}
+
+	err = tproxy.SetTProxyLinuxIPTables(interfaceName, tProxyPort, dnsPort)
 }
 
-func CleanUp() {
+func Cleanup() {
-	P.CleanUp()
+	P.Cleanup()
 	if runtime.GOOS == "linux" {
 		tproxy.CleanUpTProxyLinuxIPTables()
 	}

hub/hub.go

@@ -49,6 +49,6 @@ func Parse(options ...Option) error {
 	return nil
 }
 
-func CleanUp() {
+func Cleanup() {
-	executor.CleanUp()
+	executor.Cleanup()
 }

listener/listener.go

@@ -35,7 +35,7 @@ var (
 	tproxyUDPListener *tproxy.UDPListener
 	mixedListener     *mixed.Listener
 	mixedUDPLister    *socks.UDPListener
-	tunAdapter        ipstack.TunAdapter
+	tunStackListener  ipstack.Stack
 
 	// lock for recreate function
 	socksMux  sync.Mutex
@@ -66,18 +66,6 @@ func SetAllowLan(al bool) {
 	allowLan = al
 }
 
-func Tun() config.Tun {
-	if tunAdapter == nil {
-		return config.Tun{}
-	}
-	return config.Tun{
-		Enable:    true,
-		Stack:     tunAdapter.Stack(),
-		DnsHijack: tunAdapter.DnsHijack(),
-		AutoRoute: tunAdapter.AutoRoute(),
-	}
-}
-
 func SetBindAddress(host string) {
 	bindAddress = host
 }
@@ -323,47 +311,28 @@ func ReCreateMixed(port int, tcpIn chan<- C.ConnContext, udpIn chan<- *inbound.P
 	log.Infoln("Mixed(http+socks) proxy listening at: %s", mixedListener.Address())
 }
 
-//func ReCreateTun(conf config.Tun, tcpIn chan<- C.ConnContext, udpIn chan<- *inbound.PacketAdapter) error {
+func ReCreateTun(tunConf *config.Tun, tunAddressPrefix string, tcpIn chan<- C.ConnContext, udpIn chan<- *inbound.PacketAdapter) {
-//	tunMux.Lock()
-//	defer tunMux.Unlock()
-//
-//	if tunAdapter != nil {
-//		tunAdapter.Close()
-//		tunAdapter = nil
-//	}
-//
-//	if !conf.Enable {
-//		return nil
-//	}
-//
-//	var err error
-//	tunAdapter, err = tun.New(conf, tcpIn, udpIn)
-//
-//	return err
-//}
-
-func ReCreateTun(conf config.Tun, tcpIn chan<- C.ConnContext, udpIn chan<- *inbound.PacketAdapter) {
 	tunMux.Lock()
 	defer tunMux.Unlock()
 
 	var err error
 	defer func() {
 		if err != nil {
-			log.Errorln("Start TUN interface error: %s", err.Error())
+			log.Errorln("Start TUN listening error: %s", err.Error())
 			os.Exit(2)
 		}
 	}()
 
-	if tunAdapter != nil {
+	if tunStackListener != nil {
-		tunAdapter.Close()
+		tunStackListener.Close()
-		tunAdapter = nil
+		tunStackListener = nil
 	}
 
-	if !conf.Enable {
+	if !tunConf.Enable {
 		return
 	}
 
-	tunAdapter, err = tun.New(conf, tcpIn, udpIn)
+	tunStackListener, err = tun.New(tunConf, tunAddressPrefix, tcpIn, udpIn)
 	if err != nil {
 		log.Warnln("Failed to start TUN interface: %s", err.Error())
 	}
@@ -425,11 +394,8 @@ func genAddr(host string, port int, allowLan bool) string {
 	return fmt.Sprintf("127.0.0.1:%d", port)
 }
 
-// CleanUp clean up something
+func Cleanup() {
-func CleanUp() {
+	if tunStackListener != nil {
-	if runtime.GOOS == "windows" {
+		_ = tunStackListener.Close()
-		if tunAdapter != nil {
-			tunAdapter.Close()
-		}
 	}
 }

listener/tproxy/tproxy_linux_iptables.go

@@ -3,18 +3,17 @@ package tproxy
 import (
 	"errors"
 	"fmt"
-	"github.com/Dreamacro/clash/component/dialer"
-	"os/exec"
 	"runtime"
-	"strings"
 
+	"github.com/Dreamacro/clash/common/cmd"
+	"github.com/Dreamacro/clash/component/dialer"
 	"github.com/Dreamacro/clash/log"
 )
 
 var (
-	interfaceName = ""
-	tproxyPort    = 0
 	dnsPort       = 0
+	tProxyPort    = 0
+	interfaceName = ""
 )
 
 const (
@@ -24,7 +23,7 @@ const (
 
 func SetTProxyLinuxIPTables(ifname string, tport int, dport int) error {
 	var err error
-	if _, err = execCmd("iptables -V"); err != nil {
+	if err = execCmd("iptables -V"); err != nil {
 		return fmt.Errorf("current operations system [%s] are not support iptables or command iptables does not exist", runtime.GOOS)
 	}
 
@@ -33,7 +32,7 @@ func SetTProxyLinuxIPTables(ifname string, tport int, dport int) error {
 	}
 
 	interfaceName = ifname
-	tproxyPort = tport
+	tProxyPort = tport
 	dnsPort = dport
 
 	// add route
@@ -63,8 +62,8 @@ func SetTProxyLinuxIPTables(ifname string, tport int, dport int) error {
 	addLocalnetworkToChain("clash_prerouting")
 	execCmd("iptables -t mangle -A clash_prerouting -p tcp -m socket -j clash_divert")
 	execCmd("iptables -t mangle -A clash_prerouting -p udp -m socket -j clash_divert")
-	execCmd(fmt.Sprintf("iptables -t mangle -A clash_prerouting -p tcp -j TPROXY --on-port %d --tproxy-mark %s/%s", tproxyPort, PROXY_FWMARK, PROXY_FWMARK))
+	execCmd(fmt.Sprintf("iptables -t mangle -A clash_prerouting -p tcp -j TPROXY --on-port %d --tproxy-mark %s/%s", tProxyPort, PROXY_FWMARK, PROXY_FWMARK))
-	execCmd(fmt.Sprintf("iptables -t mangle -A clash_prerouting -p udp -j TPROXY --on-port %d --tproxy-mark %s/%s", tproxyPort, PROXY_FWMARK, PROXY_FWMARK))
+	execCmd(fmt.Sprintf("iptables -t mangle -A clash_prerouting -p udp -j TPROXY --on-port %d --tproxy-mark %s/%s", tProxyPort, PROXY_FWMARK, PROXY_FWMARK))
 	execCmd("iptables -t mangle -A PREROUTING -j clash_prerouting")
 
 	execCmd(fmt.Sprintf("iptables -t nat -I PREROUTING ! -s 172.17.0.0/16 ! -d 127.0.0.0/8 -p tcp --dport 53 -j REDIRECT --to %d", dnsPort))
@@ -96,20 +95,22 @@ func SetTProxyLinuxIPTables(ifname string, tport int, dport int) error {
 	execCmd("iptables -t nat -I OUTPUT -p tcp --dport 53 -j clash_dns_output")
 	execCmd("iptables -t nat -I OUTPUT -p udp --dport 53 -j clash_dns_output")
 
-	log.Infoln("[TProxy] Setting iptables completed")
+	log.Infoln("[TPROXY] Setting iptables completed")
 	return nil
 }
 
 func CleanUpTProxyLinuxIPTables() {
-	if interfaceName == "" || tproxyPort == 0 || dnsPort == 0 {
+	if interfaceName == "" || tProxyPort == 0 || dnsPort == 0 {
 		return
 	}
 
 	log.Warnln("Clean up tproxy linux iptables")
 
+	if int(dialer.DefaultRoutingMark.Load()) == 2158 {
 		dialer.DefaultRoutingMark.Store(0)
+	}
 
-	if _, err := execCmd("iptables -t mangle -L clash_divert"); err != nil {
+	if err := execCmd("iptables -t mangle -L clash_divert"); err != nil {
 		return
 	}
 
@@ -165,16 +166,13 @@ func addLocalnetworkToChain(chain string) {
 	execCmd(fmt.Sprintf("iptables -t mangle -A %s -d 255.255.255.255/32 -j RETURN", chain))
 }
 
-func execCmd(cmdstr string) (string, error) {
+func execCmd(cmdStr string) error {
-	log.Debugln("[TProxy] %s", cmdstr)
+	log.Debugln("[TPROXY] %s", cmdStr)
 
-	args := strings.Split(cmdstr, " ")
+	_, err := cmd.ExecCmd(cmdStr)
-	cmd := exec.Command(args[0], args[1:]...)
-	out, err := cmd.CombinedOutput()
 	if err != nil {
-		log.Errorln("[TProxy] error: %s, %s", err.Error(), string(out))
+		log.Warnln("[TPROXY] exec cmd: %v", err)
-		return "", err
 	}
 
-	return string(out), nil
+	return err
 }

listener/tun/dev/dev.go

@@ -1,12 +0,0 @@
-package dev
-
-// TunDevice is cross-platform tun interface
-type TunDevice interface {
-	Name() string
-	URL() string
-	MTU() (int, error)
-	IsClose() bool
-	Close() error
-	Read(buff []byte) (int, error)
-	Write(buff []byte) (int, error)
-}

listener/tun/dev/dev_darwin.go

@@ -1,541 +0,0 @@
-//go:build darwin
-// +build darwin
-
-package dev
-
-import (
-	"bytes"
-	"fmt"
-	"github.com/Dreamacro/clash/log"
-	"net"
-	"os"
-	"os/exec"
-	"regexp"
-	"strings"
-	"sync"
-	"syscall"
-	"unsafe"
-
-	"golang.org/x/net/ipv6"
-	"golang.org/x/sys/unix"
-
-	"github.com/Dreamacro/clash/common/pool"
-)
-
-const (
-	utunControlName = "com.apple.net.utun_control"
-	iocOut          = 0x40000000
-	iocIn           = 0x80000000
-	iocInout        = iocIn | iocOut
-)
-
-// _CTLIOCGINFO value derived from /usr/include/sys/{kern_control,ioccom}.h
-// https://github.com/apple/darwin-xnu/blob/master/bsd/sys/ioccom.h
-
-// #define CTLIOCGINFO     _IOWR('N', 3, struct ctl_info)	/* get id from name */ = 0xc0644e03
-const _CTLIOCGINFO = iocInout | ((100 & 0x1fff) << 16) | uint32(byte('N'))<<8 | 3
-
-// #define	SIOCPROTOATTACH_IN6	_IOWR('i', 110, struct in6_aliasreq_64)
-const siocprotoattachIn6 = iocInout | ((128 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 110
-
-// #define	SIOCLL_START		_IOWR('i', 130, struct in6Aliasreq)
-const siocllStart = iocInout | ((128 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 130
-
-// Following the wireguard-go solution:
-// These unix.SYS_* constants were removed from golang.org/x/sys/unix
-// so copy them here for now.
-// See https://github.com/golang/go/issues/41868
-const (
-	sysIoctl      = 54
-	sysConnect    = 98
-	sysGetsockopt = 118
-)
-
-type tunDarwin struct {
-	name       string
-	tunAddress string
-	autoRoute  bool
-	tunFile    *os.File
-	errors     chan error
-
-	closed   bool
-	stopOnce sync.Once
-}
-
-// sockaddr_ctl specifeid in /usr/include/sys/kern_control.h
-type sockaddrCtl struct {
-	scLen      uint8
-	scFamily   uint8
-	ssSysaddr  uint16
-	scID       uint32
-	scUnit     uint32
-	scReserved [5]uint32
-}
-
-type ctlInfo struct {
-	ctlID   uint32
-	ctlName [96]byte
-}
-
-// https://github.com/apple/darwin-xnu/blob/a449c6a3b8014d9406c2ddbdc81795da24aa7443/bsd/sys/sockio.h#L107
-// https://github.com/apple/darwin-xnu/blob/a449c6a3b8014d9406c2ddbdc81795da24aa7443/bsd/net/if.h#L570-L575
-// https://man.openbsd.org/netintro.4#SIOCAIFADDR
-type aliasreq struct {
-	ifraName    [unix.IFNAMSIZ]byte
-	ifraAddr    unix.RawSockaddrInet4
-	ifraDstaddr unix.RawSockaddrInet4
-	ifraMask    unix.RawSockaddrInet4
-}
-
-// SIOCAIFADDR_IN6
-// https://github.com/apple/darwin-xnu/blob/a449c6a3b8014d9406c2ddbdc81795da24aa7443/bsd/netinet6/in6_var.h#L114-L119
-// https://opensource.apple.com/source/network_cmds/network_cmds-543.260.3/
-type in6Addrlifetime struct{}
-
-// https://github.com/apple/darwin-xnu/blob/a449c6a3b8014d9406c2ddbdc81795da24aa7443/bsd/netinet6/in6_var.h#L336-L343
-// https://github.com/apple/darwin-xnu/blob/a449c6a3b8014d9406c2ddbdc81795da24aa7443/bsd/netinet6/in6.h#L174-L181
-type in6Aliasreq struct {
-	ifraName       [unix.IFNAMSIZ]byte
-	ifraAddr       unix.RawSockaddrInet6
-	ifraDstaddr    unix.RawSockaddrInet6
-	ifraPrefixmask unix.RawSockaddrInet6
-	ifraFlags      int32
-	ifraLifetime   in6Addrlifetime
-}
-
-// https://github.com/apple/darwin-xnu/blob/a449c6a3b8014d9406c2ddbdc81795da24aa7443/bsd/net/if.h#L402-L563
-
-//type ifreqAddr struct {
-//	Name [unix.IFNAMSIZ]byte
-//	Addr unix.RawSockaddrInet4
-//	Pad  [8]byte
-//}
-
-var sockaddrCtlSize uintptr = 32
-
-// OpenTunDevice return a TunDevice according a URL
-func OpenTunDevice(tunAddress string, autoRoute bool) (TunDevice, error) {
-	name := "utun"
-	mtu := 9000
-
-	ifIndex := -1
-	if name != "utun" {
-		_, err := fmt.Sscanf(name, "utun%d", &ifIndex)
-		if err != nil || ifIndex < 0 {
-			return nil, fmt.Errorf("interface name must be utun[0-9]*")
-		}
-	}
-
-	fd, err := unix.Socket(unix.AF_SYSTEM, unix.SOCK_DGRAM, 2)
-	if err != nil {
-		return nil, err
-	}
-
-	ctlInfo1 := &ctlInfo{}
-
-	copy(ctlInfo1.ctlName[:], []byte(utunControlName))
-
-	_, _, errno := unix.Syscall(
-		sysIoctl,
-		uintptr(fd),
-		uintptr(_CTLIOCGINFO),
-		uintptr(unsafe.Pointer(ctlInfo1)),
-	)
-
-	if errno != 0 {
-		return nil, fmt.Errorf("_CTLIOCGINFO: %v", errno)
-	}
-
-	sc := sockaddrCtl{
-		scLen:     uint8(sockaddrCtlSize),
-		scFamily:  unix.AF_SYSTEM,
-		ssSysaddr: 2,
-		scID:      ctlInfo1.ctlID,
-		scUnit:    uint32(ifIndex) + 1,
-	}
-
-	scPointer := unsafe.Pointer(&sc)
-
-	_, _, errno = unix.RawSyscall(
-		sysConnect,
-		uintptr(fd),
-		uintptr(scPointer),
-		uintptr(sockaddrCtlSize),
-	)
-
-	if errno != 0 {
-		return nil, fmt.Errorf("SYS_CONNECT: %v", errno)
-	}
-
-	err = syscall.SetNonblock(fd, true)
-	if err != nil {
-		return nil, err
-	}
-
-	tun, err := CreateTUNFromFile(os.NewFile(uintptr(fd), ""), mtu, tunAddress, autoRoute)
-	if err != nil {
-		return nil, err
-	}
-
-	if autoRoute {
-		setAutoRoute(tunAddress)
-	}
-
-	return tun, nil
-}
-
-func CreateTUNFromFile(file *os.File, mtu int, tunAddress string, autoRoute bool) (TunDevice, error) {
-	tun := &tunDarwin{
-		tunFile:    file,
-		tunAddress: tunAddress,
-		autoRoute:  autoRoute,
-		errors:     make(chan error, 5),
-	}
-
-	name, err := tun.getName()
-	if err != nil {
-		tun.tunFile.Close()
-		return nil, err
-	}
-	tun.name = name
-
-	if err != nil {
-		tun.tunFile.Close()
-		return nil, err
-	}
-
-	if mtu > 0 {
-		err = tun.setMTU(mtu)
-		if err != nil {
-			tun.Close()
-			return nil, err
-		}
-	}
-
-	// This address doesn't mean anything here. NIC just net an IP address to set route upon.
-	p2pAddress := net.ParseIP(tunAddress)
-	err = tun.setTunAddress(p2pAddress)
-	if err != nil {
-		tun.Close()
-		return nil, err
-	}
-	err = tun.attachLinkLocal()
-	if err != nil {
-		tun.Close()
-		return nil, err
-	}
-
-	return tun, nil
-}
-
-func (t *tunDarwin) Name() string {
-	return t.name
-}
-
-func (t *tunDarwin) URL() string {
-	return fmt.Sprintf("dev://%s", t.Name())
-}
-
-func (t *tunDarwin) MTU() (int, error) {
-	return t.getInterfaceMtu()
-}
-
-func (t *tunDarwin) Read(buff []byte) (int, error) {
-	select {
-	case err := <-t.errors:
-		return 0, err
-	default:
-		n, err := t.tunFile.Read(buff)
-		if n < 4 {
-			return 0, err
-		}
-
-		copy(buff[:], buff[4:])
-		return n - 4, err
-	}
-}
-
-func (t *tunDarwin) Write(buff []byte) (int, error) {
-	// reserve space for header
-	buf := pool.Get(pool.RelayBufferSize)
-	defer pool.Put(buf[:cap(buf)])
-
-	buf[0] = 0x00
-	buf[1] = 0x00
-	buf[2] = 0x00
-
-	copy(buf[4:], buff)
-	if buf[4]>>4 == ipv6.Version {
-		buf[3] = unix.AF_INET6
-	} else {
-		buf[3] = unix.AF_INET
-	}
-
-	// write
-	return t.tunFile.Write(buf[:4+len(buff)])
-}
-
-func (t *tunDarwin) IsClose() bool {
-	return t.closed
-}
-
-func (t *tunDarwin) Close() error {
-	t.stopOnce.Do(func() {
-		if t.autoRoute {
-			resetAutoRoute(t.tunAddress)
-		}
-		t.closed = true
-		t.tunFile.Close()
-	})
-	return nil
-}
-
-func (t *tunDarwin) getInterfaceMtu() (int, error) {
-	// open datagram socket
-
-	fd, err := unix.Socket(
-		unix.AF_INET,
-		unix.SOCK_DGRAM,
-		0,
-	)
-	if err != nil {
-		return 0, err
-	}
-
-	defer unix.Close(fd)
-
-	// do ioctl call
-
-	var ifr [64]byte
-	copy(ifr[:], t.name)
-	_, _, errno := unix.Syscall(
-		sysIoctl,
-		uintptr(fd),
-		uintptr(unix.SIOCGIFMTU),
-		uintptr(unsafe.Pointer(&ifr[0])),
-	)
-	if errno != 0 {
-		return 0, fmt.Errorf("failed to get MTU on %s", t.name)
-	}
-
-	return int(*(*int32)(unsafe.Pointer(&ifr[16]))), nil
-}
-
-func (t *tunDarwin) getName() (string, error) {
-	var ifName struct {
-		name [16]byte
-	}
-	ifNameSize := uintptr(16)
-
-	var errno syscall.Errno
-	t.operateOnFd(func(fd uintptr) {
-		_, _, errno = unix.Syscall6(
-			sysGetsockopt,
-			fd,
-			2, /* #define SYSPROTO_CONTROL 2 */
-			2, /* #define UTUN_OPT_IFNAME 2 */
-			uintptr(unsafe.Pointer(&ifName)),
-			uintptr(unsafe.Pointer(&ifNameSize)), 0)
-	})
-
-	if errno != 0 {
-		return "", fmt.Errorf("SYS_GETSOCKOPT: %v", errno)
-	}
-
-	t.name = string(ifName.name[:ifNameSize-1])
-	return t.name, nil
-}
-
-func (t *tunDarwin) setMTU(n int) error {
-	// open datagram socket
-	fd, err := unix.Socket(
-		unix.AF_INET,
-		unix.SOCK_DGRAM,
-		0,
-	)
-	if err != nil {
-		return err
-	}
-
-	defer unix.Close(fd)
-
-	// do ioctl call
-
-	var ifr [32]byte
-	copy(ifr[:], t.name)
-	*(*uint32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = uint32(n)
-	_, _, errno := unix.Syscall(
-		sysIoctl,
-		uintptr(fd),
-		uintptr(unix.SIOCSIFMTU),
-		uintptr(unsafe.Pointer(&ifr[0])),
-	)
-
-	if errno != 0 {
-		return fmt.Errorf("failed to set MTU on %s", t.name)
-	}
-
-	return nil
-}
-
-func (t *tunDarwin) operateOnFd(fn func(fd uintptr)) {
-	sysconn, err := t.tunFile.SyscallConn()
-	// TODO: consume the errors
-	if err != nil {
-		t.errors <- fmt.Errorf("unable to find sysconn for tunfile: %s", err.Error())
-		return
-	}
-	err = sysconn.Control(fn)
-	if err != nil {
-		t.errors <- fmt.Errorf("unable to control sysconn for tunfile: %s", err.Error())
-	}
-}
-
-func (t *tunDarwin) setTunAddress(addr net.IP) error {
-	var ifr [unix.IFNAMSIZ]byte
-	copy(ifr[:], t.name)
-
-	// set IPv4 address
-	fd4, err := unix.Socket(
-		unix.AF_INET,
-		unix.SOCK_DGRAM,
-		0,
-	)
-	if err != nil {
-		return err
-	}
-	defer syscall.Close(fd4)
-
-	var ip4 [4]byte
-	copy(ip4[:], addr.To4())
-	ip4mask := [4]byte{255, 255, 0, 0}
-	ifra4 := aliasreq{
-		ifraName: ifr,
-		ifraAddr: unix.RawSockaddrInet4{
-			Len:    unix.SizeofSockaddrInet4,
-			Family: unix.AF_INET,
-			Addr:   ip4,
-		},
-		ifraDstaddr: unix.RawSockaddrInet4{
-			Len:    unix.SizeofSockaddrInet4,
-			Family: unix.AF_INET,
-			Addr:   ip4,
-		},
-		ifraMask: unix.RawSockaddrInet4{
-			Len:    unix.SizeofSockaddrInet4,
-			Family: unix.AF_INET,
-			Addr:   ip4mask,
-		},
-	}
-
-	if _, _, errno := unix.Syscall(
-		sysIoctl,
-		uintptr(fd4),
-		uintptr(unix.SIOCAIFADDR),
-		uintptr(unsafe.Pointer(&ifra4)),
-	); errno != 0 {
-		return fmt.Errorf("failed to set ip address on %s: %v", t.name, errno)
-	}
-
-	return nil
-}
-
-func (t *tunDarwin) attachLinkLocal() error {
-	var ifr [unix.IFNAMSIZ]byte
-	copy(ifr[:], t.name)
-
-	// attach link-local address
-	fd6, err := unix.Socket(
-		unix.AF_INET6,
-		unix.SOCK_DGRAM,
-		0,
-	)
-	if err != nil {
-		return err
-	}
-	defer syscall.Close(fd6)
-
-	// Attach link-local address
-	ifra6 := in6Aliasreq{
-		ifraName: ifr,
-	}
-	if _, _, errno := unix.Syscall(
-		sysIoctl,
-		uintptr(fd6),
-		uintptr(siocprotoattachIn6),
-		uintptr(unsafe.Pointer(&ifra6)),
-	); errno != 0 {
-		return fmt.Errorf("failed to attach link-local address on %s: SIOCPROTOATTACH_IN6 %v", t.name, errno)
-	}
-
-	if _, _, errno := unix.Syscall(
-		sysIoctl,
-		uintptr(fd6),
-		uintptr(siocllStart),
-		uintptr(unsafe.Pointer(&ifra6)),
-	); errno != 0 {
-		return fmt.Errorf("failed to set ipv6 address on %s: SIOCLL_START %v", t.name, errno)
-	}
-
-	return nil
-}
-
-// GetAutoDetectInterface get ethernet interface
-func GetAutoDetectInterface() (string, error) {
-	cmd := exec.Command("route", "-n", "get", "default")
-	if result, err := cmd.Output(); err != nil {
-		return "", err
-	} else {
-		resultString := string(result)
-		reg, err := regexp.Compile("(interface:)(.*)")
-		if err != nil {
-			return "", err
-		}
-		matchResult := reg.FindStringSubmatch(resultString)
-		interfaceName := strings.TrimSpace(matchResult[len(matchResult)-1])
-		return interfaceName, nil
-	}
-
-}
-
-func setAutoRoute(tunGateway string) {
-	addRoute("1", tunGateway)
-	addRoute("2/7", tunGateway)
-	addRoute("4/6", tunGateway)
-	addRoute("8/5", tunGateway)
-	addRoute("16/4", tunGateway)
-	addRoute("32/3", tunGateway)
-	addRoute("64/2", tunGateway)
-	addRoute("128.0/1", tunGateway)
-	addRoute("198.18.0/16", tunGateway)
-}
-
-func resetAutoRoute(tunGateway string) {
-	delRoute("1", tunGateway)
-	delRoute("2/7", tunGateway)
-	delRoute("4/6", tunGateway)
-	delRoute("8/5", tunGateway)
-	delRoute("16/4", tunGateway)
-	delRoute("32/3", tunGateway)
-	delRoute("64/2", tunGateway)
-	delRoute("128.0/1", tunGateway)
-	delRoute("198.18.0/16", tunGateway)
-}
-
-func addRoute(net, name string) {
-	cmd := exec.Command("route", "add", "-net", net, name)
-	var stderr bytes.Buffer
-	cmd.Stderr = &stderr
-	if err := cmd.Run(); err != nil {
-		log.Errorln("[auto route] Failed to add system route: %s: %s , cmd: %s", err.Error(), stderr.String(), cmd.String())
-	}
-}
-
-func delRoute(net, name string) {
-	cmd := exec.Command("route", "delete", "-net", net, name)
-	var stderr bytes.Buffer
-	cmd.Stderr = &stderr
-	if err := cmd.Run(); err != nil {
-		log.Errorln("[auto route] Failed to delete system route: %s: %s , cmd: %s", err.Error(), stderr.String(), cmd.String())
-	}
-}

listener/tun/dev/dev_linux.go

@@ -1,349 +0,0 @@
-//go:build linux || android
-// +build linux android
-
-package dev
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"github.com/Dreamacro/clash/log"
-	"net/url"
-	"os"
-	"os/exec"
-	"strconv"
-	"strings"
-	"sync"
-	"syscall"
-	"unsafe"
-
-	"golang.org/x/sys/unix"
-)
-
-const (
-	cloneDevicePath = "/dev/net/tun"
-	ifReqSize       = unix.IFNAMSIZ + 64
-)
-
-type tunLinux struct {
-	url        string
-	name       string
-	tunAddress string
-	autoRoute  bool
-	tunFile    *os.File
-	mtu        int
-
-	closed   bool
-	stopOnce sync.Once
-}
-
-// OpenTunDevice return a TunDevice according a URL
-func OpenTunDevice(tunAddress string, autoRoute bool) (TunDevice, error) {
-	deviceURL, _ := url.Parse("dev://utun")
-	mtu, _ := strconv.ParseInt(deviceURL.Query().Get("mtu"), 0, 32)
-
-	t := &tunLinux{
-		url:        deviceURL.String(),
-		mtu:        int(mtu),
-		tunAddress: tunAddress,
-		autoRoute:  autoRoute,
-	}
-	switch deviceURL.Scheme {
-	case "dev":
-		var err error
-		var dev TunDevice
-		dev, err = t.openDeviceByName(deviceURL.Host)
-		if err != nil {
-			return nil, err
-		}
-
-		err = t.configInterface()
-		if err != nil {
-			return nil, err
-		}
-
-		if autoRoute {
-			addRoute(tunAddress)
-		}
-
-		return dev, nil
-	case "fd":
-		fd, err := strconv.ParseInt(deviceURL.Host, 10, 32)
-		if err != nil {
-			return nil, err
-		}
-		var dev TunDevice
-		dev, err = t.openDeviceByFd(int(fd))
-		if err != nil {
-			return nil, err
-		}
-		if autoRoute {
-			log.Warnln("linux unsupported automatic route")
-		}
-		return dev, nil
-	}
-	return nil, fmt.Errorf("unsupported device type `%s`", deviceURL.Scheme)
-}
-
-func (t *tunLinux) Name() string {
-	return t.name
-}
-
-func (t *tunLinux) URL() string {
-	return t.url
-}
-
-func (t *tunLinux) Write(buff []byte) (int, error) {
-	return t.tunFile.Write(buff)
-}
-
-func (t *tunLinux) Read(buff []byte) (int, error) {
-	return t.tunFile.Read(buff)
-}
-
-func (t *tunLinux) IsClose() bool {
-	return t.closed
-}
-
-func (t *tunLinux) Close() error {
-	t.stopOnce.Do(func() {
-		t.closed = true
-		t.tunFile.Close()
-	})
-	return nil
-}
-
-func (t *tunLinux) MTU() (int, error) {
-	// Sometime, we can't read MTU by SIOCGIFMTU. Then we should return the preset MTU
-	if t.mtu > 0 {
-		return t.mtu, nil
-	}
-	mtu, err := t.getInterfaceMtu()
-	return int(mtu), err
-}
-
-func (t *tunLinux) openDeviceByName(name string) (TunDevice, error) {
-	nfd, err := unix.Open(cloneDevicePath, os.O_RDWR, 0)
-	if err != nil {
-		return nil, err
-	}
-
-	var ifr [ifReqSize]byte
-	var flags uint16 = unix.IFF_TUN | unix.IFF_NO_PI
-	nameBytes := []byte(name)
-	if len(nameBytes) >= unix.IFNAMSIZ {
-		return nil, errors.New("interface name too long")
-	}
-
-	copy(ifr[:], nameBytes)
-
-	*(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = flags
-
-	_, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		uintptr(nfd),
-		uintptr(unix.TUNSETIFF),
-		uintptr(unsafe.Pointer(&ifr[0])),
-	)
-	if errno != 0 {
-		return nil, errno
-	}
-
-	err = unix.SetNonblock(nfd, true)
-	if err != nil {
-		return nil, err
-	}
-	// Note that the above -- open,ioctl,nonblock -- must happen prior to handing it to netpoll as below this line.
-
-	t.tunFile = os.NewFile(uintptr(nfd), cloneDevicePath)
-	t.name, err = t.getName()
-	if err != nil {
-		t.tunFile.Close()
-		return nil, err
-	}
-
-	return t, nil
-}
-
-func (t *tunLinux) configInterface() error {
-	var ifr [ifReqSize]byte
-	nameBytes := []byte(t.name)
-	if len(nameBytes) >= unix.IFNAMSIZ {
-		return errors.New("interface name too long")
-	}
-
-	copy(ifr[:], nameBytes)
-
-	fd, _, errno := syscall.Syscall(unix.SYS_SOCKET, unix.AF_INET, unix.SOCK_STREAM, 0)
-	if errno != 0 {
-		return errno
-	}
-
-	// set addr for tun
-	var ip []byte
-	for _, num := range strings.Split(t.tunAddress, ".") {
-		value, err := strconv.Atoi(num)
-		if err != nil {
-			return err
-		}
-		ip = append(ip, byte(value))
-	}
-
-	*(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = uint16(unix.AF_INET)
-
-	copy(ifr[unix.IFNAMSIZ+4:], ip)
-
-	_, _, errno = unix.Syscall(
-		unix.SYS_IOCTL,
-		fd,
-		uintptr(unix.SIOCSIFADDR),
-		uintptr(unsafe.Pointer(&ifr[0])))
-	if errno != 0 {
-		return errno
-	}
-
-	// set netmask for tun
-	netmask := []byte{255, 255, 0, 0}
-	copy(ifr[unix.IFNAMSIZ+4:], netmask)
-
-	_, _, errno = unix.Syscall(
-		unix.SYS_IOCTL,
-		fd,
-		uintptr(unix.SIOCSIFNETMASK),
-		uintptr(unsafe.Pointer(&ifr[0])))
-	if errno != 0 {
-		return errno
-	}
-
-	// interface up
-	_, _, errno = syscall.Syscall(unix.SYS_IOCTL, fd, uintptr(unix.SIOCSIFFLAGS), uintptr(unsafe.Pointer(&ifr[0])))
-
-	var flags = uint16(unix.IFF_UP | unix.IFF_TUN | unix.IFF_MULTICAST | unix.IFF_RUNNING | unix.IFF_NOARP)
-	*(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = flags
-
-	_, _, errno = syscall.Syscall(
-		unix.SYS_IOCTL,
-		fd,
-		uintptr(unix.SIOCSIFFLAGS),
-		uintptr(unsafe.Pointer(&ifr[0])))
-	if errno != 0 {
-		return errno
-	}
-
-	return nil
-}
-
-func (t *tunLinux) openDeviceByFd(fd int) (TunDevice, error) {
-	var ifr struct {
-		name  [16]byte
-		flags uint16
-		_     [22]byte
-	}
-
-	fd, err := syscall.Dup(fd)
-	if err != nil {
-		return nil, err
-	}
-
-	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.TUNGETIFF, uintptr(unsafe.Pointer(&ifr)))
-	if errno != 0 {
-		return nil, errno
-	}
-
-	if ifr.flags&syscall.IFF_TUN == 0 || ifr.flags&syscall.IFF_NO_PI == 0 {
-		return nil, errors.New("only tun device and no pi mode supported")
-	}
-
-	nullStr := ifr.name[:]
-	i := bytes.IndexByte(nullStr, 0)
-	if i != -1 {
-		nullStr = nullStr[:i]
-	}
-	t.name = string(nullStr)
-	t.tunFile = os.NewFile(uintptr(fd), "/dev/tun")
-
-	return t, nil
-}
-
-func (t *tunLinux) getInterfaceMtu() (uint32, error) {
-	fd, err := syscall.Socket(syscall.AF_UNIX, syscall.SOCK_DGRAM, 0)
-	if err != nil {
-		return 0, err
-	}
-
-	defer syscall.Close(fd)
-
-	var ifreq struct {
-		name [16]byte
-		mtu  int32
-		_    [20]byte
-	}
-
-	copy(ifreq.name[:], t.name)
-	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.SIOCGIFMTU, uintptr(unsafe.Pointer(&ifreq)))
-	if errno != 0 {
-		return 0, errno
-	}
-
-	return uint32(ifreq.mtu), nil
-}
-
-func (t *tunLinux) getName() (string, error) {
-	sysconn, err := t.tunFile.SyscallConn()
-	if err != nil {
-		return "", err
-	}
-	var ifr [ifReqSize]byte
-	var errno syscall.Errno
-	err = sysconn.Control(func(fd uintptr) {
-		_, _, errno = unix.Syscall(
-			unix.SYS_IOCTL,
-			fd,
-			uintptr(unix.TUNGETIFF),
-			uintptr(unsafe.Pointer(&ifr[0])),
-		)
-	})
-	if err != nil {
-		return "", errors.New("failed to get name of TUN device: " + err.Error())
-	}
-	if errno != 0 {
-		return "", errors.New("failed to get name of TUN device: " + errno.Error())
-	}
-	nullStr := ifr[:]
-	i := bytes.IndexByte(nullStr, 0)
-	if i != -1 {
-		nullStr = nullStr[:i]
-	}
-	t.name = string(nullStr)
-	return t.name, nil
-}
-
-// GetAutoDetectInterface get ethernet interface
-func GetAutoDetectInterface() (string, error) {
-	cmd := exec.Command("bash", "-c", "ip route show | grep 'default via' | awk -F ' ' 'NR==1{print $5}' | xargs echo -n")
-	var out bytes.Buffer
-	cmd.Stdout = &out
-	err := cmd.Run()
-	if err != nil {
-		return "", err
-	}
-	return out.String(), nil
-}
-
-func addRoute(gateway string) {
-	cmd := exec.Command("route", "add", "default", "gw", gateway)
-	var stderr bytes.Buffer
-	cmd.Stderr = &stderr
-	if err := cmd.Run(); err != nil {
-		log.Errorln("[auto route] Failed to add system route: %s: %s , cmd: %s", err.Error(), stderr.String(), cmd.String())
-	}
-}
-
-func delRoute(gateway string) {
-	cmd := exec.Command("ip", "route", "delete", "gw")
-	var stderr bytes.Buffer
-	cmd.Stderr = &stderr
-	if err := cmd.Run(); err != nil {
-		log.Errorln("[auto route] Failed to delete system route: %s: %s , cmd: %s", err.Error(), stderr.String(), cmd.String())
-	}
-}

listener/tun/dev/dev_unsupport.go

@@ -1,18 +0,0 @@
-//go:build !linux && !android && !darwin && !windows
-// +build !linux,!android,!darwin,!windows
-
-package dev
-
-import (
-	"errors"
-	"runtime"
-)
-
-func OpenTunDevice(tunAddress string, autoRute bool) (TunDevice, error) {
-	return nil, errors.New("Unsupported platform " + runtime.GOOS + "/" + runtime.GOARCH)
-}
-
-// GetAutoDetectInterface get ethernet interface
-func GetAutoDetectInterface() (string, error) {
-	return "", nil
-}

listener/tun/dev/dev_windows.go

@@ -1,163 +0,0 @@
-//go:build windows
-// +build windows
-
-// Modified from: https://git.zx2c4.com/wireguard-go/tree/tun/tun_windows.go and https://git.zx2c4.com/wireguard-windows/tree/tunnel/addressconfig.go
-// SPDX-License-Identifier: MIT
-
-package dev
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"sync/atomic"
-	"time"
-	_ "unsafe"
-
-	"github.com/Dreamacro/clash/listener/tun/dev/wintun"
-	"golang.org/x/sys/windows"
-)
-
-const (
-	rateMeasurementGranularity = uint64((time.Second / 2) / time.Nanosecond)
-	spinloopRateThreshold      = 800000000 / 8                                   // 800mbps
-	spinloopDuration           = uint64(time.Millisecond / 80 / time.Nanosecond) // ~1gbit/s
-)
-
-type rateJuggler struct {
-	current       uint64
-	nextByteCount uint64
-	nextStartTime int64
-	changing      int32
-}
-
-var WintunTunnelType = "Meta"
-var WintunStaticRequestedGUID *windows.GUID
-
-//go:linkname procyield runtime.procyield
-func procyield(cycles uint32)
-
-//go:linkname nanotime runtime.nanotime
-func nanotime() int64
-
-func (tun *tunWindows) Close() error {
-	var err error
-	tun.closeOnce.Do(func() {
-		atomic.StoreInt32(&tun.close, 1)
-		windows.SetEvent(tun.readWait)
-		//tun.running.Wait()
-		tun.session.End()
-		if tun.wt != nil {
-			err = tun.wt.Close()
-		}
-	})
-	return err
-}
-
-func (tun *tunWindows) MTU() (int, error) {
-	return tun.forcedMTU, nil
-}
-
-// TODO: This is a temporary hack. We really need to be monitoring the interface in real time and adapting to MTU changes.
-func (tun *tunWindows) ForceMTU(mtu int) {
-	tun.forcedMTU = mtu
-}
-
-// Note: Read() and Write() assume the caller comes only from a single thread; there's no locking.
-
-func (tun *tunWindows) Read0(buff []byte, offset int) (int, error) {
-	tun.running.Add(1)
-
-	defer tun.running.Done()
-retry:
-	if atomic.LoadInt32(&tun.close) == 1 {
-		return 0, os.ErrClosed
-	}
-	start := nanotime()
-	shouldSpin := atomic.LoadUint64(&tun.rate.current) >= spinloopRateThreshold && uint64(start-atomic.LoadInt64(&tun.rate.nextStartTime)) <= rateMeasurementGranularity*2
-	for {
-		if atomic.LoadInt32(&tun.close) == 1 {
-			return 0, os.ErrClosed
-		}
-		packet, err := tun.session.ReceivePacket()
-		switch err {
-		case nil:
-			packetSize := len(packet)
-			copy(buff[offset:], packet)
-			tun.session.ReleaseReceivePacket(packet)
-			tun.rate.update(uint64(packetSize))
-			return packetSize, nil
-		case windows.ERROR_NO_MORE_ITEMS:
-			if !shouldSpin || uint64(nanotime()-start) >= spinloopDuration {
-				windows.WaitForSingleObject(tun.readWait, windows.INFINITE)
-				goto retry
-			}
-			procyield(1)
-			continue
-		case windows.ERROR_HANDLE_EOF:
-			return 0, os.ErrClosed
-		case windows.ERROR_INVALID_DATA:
-			return 0, errors.New("Send ring corrupt")
-		}
-		return 0, fmt.Errorf("Read failed: %w", err)
-	}
-}
-
-func (tun *tunWindows) Flush() error {
-	return nil
-}
-
-func (tun *tunWindows) Write0(buff []byte, offset int) (int, error) {
-	tun.running.Add(1)
-	defer tun.running.Done()
-	if atomic.LoadInt32(&tun.close) == 1 {
-		return 0, os.ErrClosed
-	}
-
-	packetSize := len(buff) - offset
-	tun.rate.update(uint64(packetSize))
-
-	packet, err := tun.session.AllocateSendPacket(packetSize)
-	if err == nil {
-		copy(packet, buff[offset:])
-		tun.session.SendPacket(packet)
-		return packetSize, nil
-	}
-	switch err {
-	case windows.ERROR_HANDLE_EOF:
-		return 0, os.ErrClosed
-	case windows.ERROR_BUFFER_OVERFLOW:
-		return 0, nil // Dropping when ring is full.
-	}
-	return 0, fmt.Errorf("Write failed: %w", err)
-}
-
-// LUID returns Windows interface instance ID.
-func (tun *tunWindows) LUID() uint64 {
-	tun.running.Add(1)
-	defer tun.running.Done()
-	if atomic.LoadInt32(&tun.close) == 1 {
-		return 0
-	}
-	return tun.wt.LUID()
-}
-
-// RunningVersion returns the running version of the Wintun driver.
-func (tun *tunWindows) RunningVersion() (version uint32, err error) {
-	return wintun.RunningVersion()
-}
-
-func (rate *rateJuggler) update(packetLen uint64) {
-	now := nanotime()
-	total := atomic.AddUint64(&rate.nextByteCount, packetLen)
-	period := uint64(now - atomic.LoadInt64(&rate.nextStartTime))
-	if period >= rateMeasurementGranularity {
-		if !atomic.CompareAndSwapInt32(&rate.changing, 0, 1) {
-			return
-		}
-		atomic.StoreInt64(&rate.nextStartTime, now)
-		atomic.StoreUint64(&rate.current, total*uint64(time.Second/time.Nanosecond)/period)
-		atomic.StoreUint64(&rate.nextByteCount, 0)
-		atomic.StoreInt32(&rate.changing, 0)
-	}
-}

listener/tun/dev/wintun/config.go

@@ -1,57 +0,0 @@
-//go:build windows
-// +build windows
-
-package wintun
-
-import (
-	"fmt"
-	"net"
-	"strconv"
-	"strings"
-)
-
-type IPCidr struct {
-	IP   net.IP
-	Cidr uint8
-}
-
-func (r *IPCidr) String() string {
-	return fmt.Sprintf("%s/%d", r.IP.String(), r.Cidr)
-}
-
-func (r *IPCidr) Bits() uint8 {
-	if r.IP.To4() != nil {
-		return 32
-	}
-	return 128
-}
-
-func (r *IPCidr) IPNet() net.IPNet {
-	return net.IPNet{
-		IP:   r.IP,
-		Mask: net.CIDRMask(int(r.Cidr), int(r.Bits())),
-	}
-}
-
-func (r *IPCidr) MaskSelf() {
-	bits := int(r.Bits())
-	mask := net.CIDRMask(int(r.Cidr), bits)
-	for i := 0; i < bits/8; i++ {
-		r.IP[i] &= mask[i]
-	}
-}
-
-func ParseIPCidr(ipcidr string) *IPCidr {
-	s := strings.Split(ipcidr, "/")
-	if len(s) != 2 {
-		return nil
-	}
-	cidr, err := strconv.Atoi(s[1])
-	if err != nil {
-		return nil
-	}
-	return &IPCidr{
-		IP:   net.ParseIP(s[0]),
-		Cidr: uint8(cidr),
-	}
-}

listener/tun/dev/wintun/dll_windows.go

@@ -1,94 +0,0 @@
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
- */
-
-package wintun
-
-import (
-	"fmt"
-	"github.com/Dreamacro/clash/listener/tun/dev/wintun/embed_dll"
-	"golang.zx2c4.com/wireguard/windows/driver/memmod"
-	"sync"
-	"sync/atomic"
-	"unsafe"
-)
-
-func newLazyDLL(name string, onLoad func(d *lazyDLL)) *lazyDLL {
-	return &lazyDLL{Name: name, onLoad: onLoad}
-}
-
-func (d *lazyDLL) NewProc(name string) *lazyProc {
-	return &lazyProc{dll: d, Name: name}
-}
-
-type lazyProc struct {
-	Name string
-	mu   sync.Mutex
-	dll  *lazyDLL
-	addr uintptr
-}
-
-func (p *lazyProc) Find() error {
-	if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&p.addr))) != nil {
-		return nil
-	}
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	if p.addr != 0 {
-		return nil
-	}
-
-	err := p.dll.Load()
-	if err != nil {
-		return fmt.Errorf("Error loading %v DLL: %w", p.dll.Name, err)
-	}
-	addr, err := p.nameToAddr()
-	if err != nil {
-		return fmt.Errorf("Error getting %v address: %w", p.Name, err)
-	}
-
-	atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&p.addr)), unsafe.Pointer(addr))
-	return nil
-}
-
-func (p *lazyProc) Addr() uintptr {
-	err := p.Find()
-	if err != nil {
-		panic(err)
-	}
-	return p.addr
-}
-
-type lazyDLL struct {
-	Name   string
-	mu     sync.Mutex
-	module *memmod.Module
-	onLoad func(d *lazyDLL)
-}
-
-func (d *lazyDLL) Load() error {
-	if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&d.module))) != nil {
-		return nil
-	}
-	d.mu.Lock()
-	defer d.mu.Unlock()
-	if d.module != nil {
-		return nil
-	}
-
-	module, err := memmod.LoadLibrary(embed_dll.DDlContent)
-	if err != nil {
-		return fmt.Errorf("Unable to load library: %w", err)
-	}
-
-	atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&d.module)), unsafe.Pointer(module))
-	if d.onLoad != nil {
-		d.onLoad(d)
-	}
-	return nil
-}
-
-func (p *lazyProc) nameToAddr() (uintptr, error) {
-	return p.dll.module.ProcAddressByName(p.Name)
-}

listener/tun/dev/wintun/package_info.go

@@ -1,11 +0,0 @@
-//go:build windows
-// +build windows
-
-// Modified from: https://git.zx2c4.com/wireguard-go/tree/tun/wintun
-
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
- */
-
-package wintun

listener/tun/dev/wintun/session_windows.go

@@ -1,90 +0,0 @@
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
- */
-
-package wintun
-
-import (
-	"syscall"
-	"unsafe"
-
-	"golang.org/x/sys/windows"
-)
-
-type Session struct {
-	handle uintptr
-}
-
-const (
-	PacketSizeMax   = 0xffff    // Maximum packet size
-	RingCapacityMin = 0x20000   // Minimum ring capacity (128 kiB)
-	RingCapacityMax = 0x4000000 // Maximum ring capacity (64 MiB)
-)
-
-// Packet with data
-type Packet struct {
-	Next *Packet              // Pointer to next packet in queue
-	Size uint32               // Size of packet (max WINTUN_MAX_IP_PACKET_SIZE)
-	Data *[PacketSizeMax]byte // Pointer to layer 3 IPv4 or IPv6 packet
-}
-
-var (
-	procWintunAllocateSendPacket   = modwintun.NewProc("WintunAllocateSendPacket")
-	procWintunEndSession           = modwintun.NewProc("WintunEndSession")
-	procWintunGetReadWaitEvent     = modwintun.NewProc("WintunGetReadWaitEvent")
-	procWintunReceivePacket        = modwintun.NewProc("WintunReceivePacket")
-	procWintunReleaseReceivePacket = modwintun.NewProc("WintunReleaseReceivePacket")
-	procWintunSendPacket           = modwintun.NewProc("WintunSendPacket")
-	procWintunStartSession         = modwintun.NewProc("WintunStartSession")
-)
-
-func (wintun *Adapter) StartSession(capacity uint32) (session Session, err error) {
-	r0, _, e1 := syscall.Syscall(procWintunStartSession.Addr(), 2, uintptr(wintun.handle), uintptr(capacity), 0)
-	if r0 == 0 {
-		err = e1
-	} else {
-		session = Session{r0}
-	}
-	return
-}
-
-func (session Session) End() {
-	syscall.Syscall(procWintunEndSession.Addr(), 1, session.handle, 0, 0)
-	session.handle = 0
-}
-
-func (session Session) ReadWaitEvent() (handle windows.Handle) {
-	r0, _, _ := syscall.Syscall(procWintunGetReadWaitEvent.Addr(), 1, session.handle, 0, 0)
-	handle = windows.Handle(r0)
-	return
-}
-
-func (session Session) ReceivePacket() (packet []byte, err error) {
-	var packetSize uint32
-	r0, _, e1 := syscall.Syscall(procWintunReceivePacket.Addr(), 2, session.handle, uintptr(unsafe.Pointer(&packetSize)), 0)
-	if r0 == 0 {
-		err = e1
-		return
-	}
-	packet = unsafe.Slice((*byte)(unsafe.Pointer(r0)), packetSize)
-	return
-}
-
-func (session Session) ReleaseReceivePacket(packet []byte) {
-	syscall.Syscall(procWintunReleaseReceivePacket.Addr(), 2, session.handle, uintptr(unsafe.Pointer(&packet[0])), 0)
-}
-
-func (session Session) AllocateSendPacket(packetSize int) (packet []byte, err error) {
-	r0, _, e1 := syscall.Syscall(procWintunAllocateSendPacket.Addr(), 2, session.handle, uintptr(packetSize), 0)
-	if r0 == 0 {
-		err = e1
-		return
-	}
-	packet = unsafe.Slice((*byte)(unsafe.Pointer(r0)), packetSize)
-	return
-}
-
-func (session Session) SendPacket(packet []byte) {
-	syscall.Syscall(procWintunSendPacket.Addr(), 2, session.handle, uintptr(unsafe.Pointer(&packet[0])), 0)
-}

listener/tun/dev/wintun/wintun_windows.go

@@ -1,153 +0,0 @@
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
- */
-
-package wintun
-
-import (
-	"runtime"
-	"syscall"
-	"unsafe"
-
-	"github.com/Dreamacro/clash/log"
-	"golang.org/x/sys/windows"
-)
-
-type loggerLevel int
-
-const (
-	logInfo loggerLevel = iota
-	logWarn
-	logErr
-)
-
-const AdapterNameMax = 128
-
-type Adapter struct {
-	handle uintptr
-}
-
-var (
-	modwintun                         = newLazyDLL("wintun.dll", setupLogger)
-	procWintunCreateAdapter           = modwintun.NewProc("WintunCreateAdapter")
-	procWintunOpenAdapter             = modwintun.NewProc("WintunOpenAdapter")
-	procWintunCloseAdapter            = modwintun.NewProc("WintunCloseAdapter")
-	procWintunDeleteDriver            = modwintun.NewProc("WintunDeleteDriver")
-	procWintunGetAdapterLUID          = modwintun.NewProc("WintunGetAdapterLUID")
-	procWintunGetRunningDriverVersion = modwintun.NewProc("WintunGetRunningDriverVersion")
-)
-
-func logMessage(level loggerLevel, _ uint64, msg *uint16) int {
-	var lv log.LogLevel
-	switch level {
-	case logInfo:
-		lv = log.INFO
-	case logWarn:
-		lv = log.WARNING
-	case logErr:
-		lv = log.ERROR
-	default:
-		lv = log.INFO
-	}
-	log.PrintLog(lv, "[Wintun] %s", windows.UTF16PtrToString(msg))
-	return 0
-}
-
-func setupLogger(dll *lazyDLL) {
-	var callback uintptr
-	if runtime.GOARCH == "386" {
-		callback = windows.NewCallback(func(level loggerLevel, timestampLow, timestampHigh uint32, msg *uint16) int {
-			return logMessage(level, uint64(timestampHigh)<<32|uint64(timestampLow), msg)
-		})
-	} else if runtime.GOARCH == "arm" {
-		callback = windows.NewCallback(func(level loggerLevel, _, timestampLow, timestampHigh uint32, msg *uint16) int {
-			return logMessage(level, uint64(timestampHigh)<<32|uint64(timestampLow), msg)
-		})
-	} else if runtime.GOARCH == "amd64" || runtime.GOARCH == "arm64" {
-		callback = windows.NewCallback(logMessage)
-	}
-	syscall.Syscall(dll.NewProc("WintunSetLogger").Addr(), 1, callback, 0, 0)
-}
-
-func closeAdapter(wintun *Adapter) {
-	syscall.Syscall(procWintunCloseAdapter.Addr(), 1, wintun.handle, 0, 0)
-}
-
-// CreateAdapter creates a Wintun adapter. name is the cosmetic name of the adapter.
-// tunnelType represents the type of adapter and should be "Wintun". requestedGUID is
-// the GUID of the created network adapter, which then influences NLA generation
-// deterministically. If it is set to nil, the GUID is chosen by the system at random,
-// and hence a new NLA entry is created for each new adapter.
-func CreateAdapter(name string, tunnelType string, requestedGUID *windows.GUID) (wintun *Adapter, err error) {
-	var name16 *uint16
-	name16, err = windows.UTF16PtrFromString(name)
-	if err != nil {
-		return
-	}
-	var tunnelType16 *uint16
-	tunnelType16, err = windows.UTF16PtrFromString(tunnelType)
-	if err != nil {
-		return
-	}
-	r0, _, e1 := syscall.Syscall(procWintunCreateAdapter.Addr(), 3, uintptr(unsafe.Pointer(name16)), uintptr(unsafe.Pointer(tunnelType16)), uintptr(unsafe.Pointer(requestedGUID)))
-	if r0 == 0 {
-		err = e1
-		return
-	}
-	wintun = &Adapter{handle: r0}
-	runtime.SetFinalizer(wintun, closeAdapter)
-	return
-}
-
-// OpenAdapter opens an existing Wintun adapter by name.
-func OpenAdapter(name string) (wintun *Adapter, err error) {
-	var name16 *uint16
-	name16, err = windows.UTF16PtrFromString(name)
-	if err != nil {
-		return
-	}
-	r0, _, e1 := syscall.Syscall(procWintunOpenAdapter.Addr(), 1, uintptr(unsafe.Pointer(name16)), 0, 0)
-	if r0 == 0 {
-		err = e1
-		return
-	}
-	wintun = &Adapter{handle: r0}
-	runtime.SetFinalizer(wintun, closeAdapter)
-	return
-}
-
-// Close closes a Wintun adapter.
-func (wintun *Adapter) Close() (err error) {
-	runtime.SetFinalizer(wintun, nil)
-	r1, _, e1 := syscall.Syscall(procWintunCloseAdapter.Addr(), 1, wintun.handle, 0, 0)
-	if r1 == 0 {
-		err = e1
-	}
-	return
-}
-
-// Uninstall removes the driver from the system if no drivers are currently in use.
-func Uninstall() (err error) {
-	r1, _, e1 := syscall.Syscall(procWintunDeleteDriver.Addr(), 0, 0, 0, 0)
-	if r1 == 0 {
-		err = e1
-	}
-	return
-}
-
-// RunningVersion returns the version of the loaded driver.
-func RunningVersion() (version uint32, err error) {
-	r0, _, e1 := syscall.Syscall(procWintunGetRunningDriverVersion.Addr(), 0, 0, 0, 0)
-	version = uint32(r0)
-	if version == 0 {
-		err = e1
-	}
-	return
-}
-
-// LUID returns the LUID of the adapter.
-func (wintun *Adapter) LUID() (luid uint64) {
-	syscall.Syscall(procWintunGetAdapterLUID.Addr(), 2, uintptr(wintun.handle), uintptr(unsafe.Pointer(&luid)), 0)
-	return
-}

listener/tun/device/device.go

@@ -0,0 +1,32 @@
+package device
+
+import (
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+// Device is the interface that implemented by network layer devices (e.g. tun),
+// and easy to use as stack.LinkEndpoint.
+type Device interface {
+	stack.LinkEndpoint
+
+	// Name returns the current name of the device.
+	Name() string
+
+	// Type returns the driver type of the device.
+	Type() string
+
+	// Read packets from tun device
+	Read(packet []byte) (int, error)
+
+	// Write packets to tun device
+	Write(packet []byte) (int, error)
+
+	// Close stops and closes the device.
+	Close() error
+
+	// UseEndpoint work for gVisor stack
+	UseEndpoint() error
+
+	// UseIOBased work for other ip stack
+	UseIOBased() error
+}

listener/tun/device/fdbased/fd.go

@@ -0,0 +1,5 @@
+package fdbased
+
+const Driver = "fd"
+
+const defaultMTU = 1500

listener/tun/device/fdbased/fd_unix.go

@@ -0,0 +1,60 @@
+//go:build !windows
+
+package fdbased
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+
+	"github.com/Dreamacro/clash/listener/tun/device"
+
+	"golang.org/x/sys/unix"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+type FD struct {
+	stack.LinkEndpoint
+
+	fd  int
+	mtu uint32
+
+	file *os.File
+}
+
+func Open(name string, mtu uint32) (device.Device, error) {
+	fd, err := strconv.Atoi(name)
+	if err != nil {
+		return nil, fmt.Errorf("cannot open fd: %s", name)
+	}
+	if mtu == 0 {
+		mtu = defaultMTU
+	}
+	return open(fd, mtu)
+}
+
+func (f *FD) Type() string {
+	return Driver
+}
+
+func (f *FD) Name() string {
+	return strconv.Itoa(f.fd)
+}
+
+func (f *FD) Close() error {
+	err := unix.Close(f.fd)
+	if f.file != nil {
+		_ = f.file.Close()
+	}
+	return err
+}
+
+func (f *FD) UseEndpoint() error {
+	return f.useEndpoint()
+}
+
+func (f *FD) UseIOBased() error {
+	return f.useIOBased()
+}
+
+var _ device.Device = (*FD)(nil)

listener/tun/device/fdbased/fd_windows.go

@@ -0,0 +1,11 @@
+package fdbased
+
+import (
+	"errors"
+
+	"github.com/Dreamacro/clash/listener/tun/device"
+)
+
+func Open(name string, mtu uint32) (device.Device, error) {
+	return nil, errors.New("not supported")
+}

listener/tun/device/fdbased/open_linux.go

@@ -0,0 +1,56 @@
+package fdbased
+
+import (
+	"fmt"
+
+	"github.com/Dreamacro/clash/listener/tun/device"
+
+	"gvisor.dev/gvisor/pkg/tcpip/link/fdbased"
+	"gvisor.dev/gvisor/pkg/tcpip/link/rawfile"
+)
+
+func open(fd int, mtu uint32) (device.Device, error) {
+	f := &FD{fd: fd, mtu: mtu}
+
+	return f, nil
+}
+
+func (f *FD) useEndpoint() error {
+	ep, err := fdbased.New(&fdbased.Options{
+		FDs: []int{f.fd},
+		MTU: f.mtu,
+		// TUN only, ignore ethernet header.
+		EthernetHeader: false,
+	})
+	if err != nil {
+		return fmt.Errorf("create endpoint: %w", err)
+	}
+	f.LinkEndpoint = ep
+	return nil
+}
+
+func (f *FD) useIOBased() error {
+	return nil
+}
+
+func (f *FD) Read(packet []byte) (int, error) {
+	n, gvErr := rawfile.BlockingRead(f.fd, packet)
+	if gvErr != nil {
+		return 0, fmt.Errorf("read error: %s", gvErr.String())
+	}
+
+	return n, nil
+}
+
+func (f *FD) Write(packet []byte) (int, error) {
+	n := len(packet)
+	if n == 0 {
+		return 0, nil
+	}
+
+	gvErr := rawfile.NonBlockingWrite(f.fd, packet)
+	if gvErr != nil {
+		return 0, fmt.Errorf("write error: %s", gvErr.String())
+	}
+	return n, nil
+}

listener/tun/device/fdbased/open_others.go

@@ -0,0 +1,42 @@
+//go:build !linux && !windows
+
+package fdbased
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/Dreamacro/clash/listener/tun/device"
+	"github.com/Dreamacro/clash/listener/tun/device/iobased"
+)
+
+func open(fd int, mtu uint32) (device.Device, error) {
+	f := &FD{fd: fd, mtu: mtu}
+
+	return f, nil
+}
+
+func (f *FD) useEndpoint() error {
+	ep, err := iobased.New(os.NewFile(uintptr(f.fd), f.Name()), f.mtu, 0)
+	if err != nil {
+		return fmt.Errorf("create endpoint: %w", err)
+	}
+	f.LinkEndpoint = ep
+	return nil
+}
+
+func (f *FD) useIOBased() error {
+	f.file = os.NewFile(uintptr(f.fd), f.Name())
+	if f.file == nil {
+		return fmt.Errorf("create IOBased failed, can not open file: %s", f.Name())
+	}
+	return nil
+}
+
+func (f *FD) Read(packet []byte) (int, error) {
+	return f.file.Read(packet)
+}
+
+func (f *FD) Write(packet []byte) (int, error) {
+	return f.file.Write(packet)
+}

listener/tun/device/iobased/endpoint.go

@@ -0,0 +1,134 @@
+// Package iobased provides the implementation of io.ReadWriter
+// based data-link layer endpoints.
+package iobased
+
+import (
+	"context"
+	"errors"
+	"io"
+	"sync"
+
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/buffer"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+	"gvisor.dev/gvisor/pkg/tcpip/link/channel"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+const (
+	// Queue length for outbound packet, arriving for read. Overflow
+	// causes packet drops.
+	defaultOutQueueLen = 1 << 10
+)
+
+// Endpoint implements the interface of stack.LinkEndpoint from io.ReadWriter.
+type Endpoint struct {
+	*channel.Endpoint
+
+	// rw is the io.ReadWriter for reading and writing packets.
+	rw io.ReadWriter
+
+	// mtu (maximum transmission unit) is the maximum size of a packet.
+	mtu uint32
+
+	// offset can be useful when perform TUN device I/O with TUN_PI enabled.
+	offset int
+
+	// once is used to perform the init action once when attaching.
+	once sync.Once
+}
+
+// New returns stack.LinkEndpoint(.*Endpoint) and error.
+func New(rw io.ReadWriter, mtu uint32, offset int) (*Endpoint, error) {
+	if mtu == 0 {
+		return nil, errors.New("MTU size is zero")
+	}
+
+	if rw == nil {
+		return nil, errors.New("RW interface is nil")
+	}
+
+	if offset < 0 {
+		return nil, errors.New("offset must be non-negative")
+	}
+
+	return &Endpoint{
+		Endpoint: channel.New(defaultOutQueueLen, mtu, ""),
+		rw:       rw,
+		mtu:      mtu,
+		offset:   offset,
+	}, nil
+}
+
+func (e *Endpoint) Close() {
+	e.Endpoint.Close()
+}
+
+// Attach launches the goroutine that reads packets from io.Reader and
+// dispatches them via the provided dispatcher.
+func (e *Endpoint) Attach(dispatcher stack.NetworkDispatcher) {
+	e.once.Do(func() {
+		ctx, cancel := context.WithCancel(context.Background())
+		go e.dispatchLoop(cancel)
+		go e.outboundLoop(ctx)
+	})
+	e.Endpoint.Attach(dispatcher)
+}
+
+// dispatchLoop dispatches packets to upper layer.
+func (e *Endpoint) dispatchLoop(cancel context.CancelFunc) {
+	// Call cancel() to ensure (*Endpoint).outboundLoop(context.Context) exits
+	// gracefully after (*Endpoint).dispatchLoop(context.CancelFunc) returns.
+	defer cancel()
+
+	for {
+		data := make([]byte, int(e.mtu))
+
+		n, err := e.rw.Read(data)
+		if err != nil {
+			break
+		}
+
+		if !e.IsAttached() {
+			continue /* unattached, drop packet */
+		}
+
+		pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
+			Data: buffer.View(data[:n]).ToVectorisedView(),
+		})
+
+		switch header.IPVersion(data) {
+		case header.IPv4Version:
+			e.InjectInbound(header.IPv4ProtocolNumber, pkt)
+		case header.IPv6Version:
+			e.InjectInbound(header.IPv6ProtocolNumber, pkt)
+		}
+		pkt.DecRef() /* release */
+	}
+}
+
+// outboundLoop reads outbound packets from channel, and then it calls
+// writePacket to send those packets back to lower layer.
+func (e *Endpoint) outboundLoop(ctx context.Context) {
+	for {
+		pkt := e.ReadContext(ctx)
+		if pkt == nil {
+			break
+		}
+		e.writePacket(pkt)
+	}
+}
+
+// writePacket writes outbound packets to the io.Writer.
+func (e *Endpoint) writePacket(pkt *stack.PacketBuffer) tcpip.Error {
+	defer pkt.DecRef()
+
+	size := pkt.Size()
+	views := pkt.Views()
+
+	vView := buffer.NewVectorisedView(size, views)
+	if _, err := e.rw.Write(vView.ToView()); err != nil {
+		return &tcpip.ErrInvalidEndpointState{}
+	}
+	return nil
+}

listener/tun/device/tun/tun.go

@@ -0,0 +1,14 @@
+// Package tun provides TUN which implemented device.Device interface.
+package tun
+
+import (
+	"github.com/Dreamacro/clash/listener/tun/device"
+)
+
+const Driver = "tun"
+
+func (t *TUN) Type() string {
+	return Driver
+}
+
+var _ device.Device = (*TUN)(nil)

listener/tun/device/tun/tun_netstack.go

@@ -0,0 +1,145 @@
+//go:build linux
+
+package tun
+
+import (
+	"fmt"
+	"unsafe"
+
+	"github.com/Dreamacro/clash/listener/tun/device"
+
+	"golang.org/x/sys/unix"
+	"gvisor.dev/gvisor/pkg/tcpip/link/fdbased"
+	"gvisor.dev/gvisor/pkg/tcpip/link/rawfile"
+	"gvisor.dev/gvisor/pkg/tcpip/link/tun"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+type TUN struct {
+	stack.LinkEndpoint
+
+	fd   int
+	mtu  uint32
+	name string
+}
+
+func Open(name string, mtu uint32) (device.Device, error) {
+	t := &TUN{name: name, mtu: mtu}
+
+	if len(t.name) >= unix.IFNAMSIZ {
+		return nil, fmt.Errorf("interface name too long: %s", t.name)
+	}
+
+	fd, err := tun.Open(t.name)
+	if err != nil {
+		return nil, fmt.Errorf("create tun: %w", err)
+	}
+	t.fd = fd
+
+	if t.mtu > 0 {
+		if err := setMTU(t.name, t.mtu); err != nil {
+			return nil, fmt.Errorf("set mtu: %w", err)
+		}
+	}
+
+	_mtu, err := rawfile.GetMTU(t.name)
+	if err != nil {
+		return nil, fmt.Errorf("get mtu: %w", err)
+	}
+	t.mtu = _mtu
+
+	return t, nil
+}
+
+func (t *TUN) Name() string {
+	return t.name
+}
+
+func (t *TUN) Read(packet []byte) (int, error) {
+	n, gvErr := rawfile.BlockingRead(t.fd, packet)
+	if gvErr != nil {
+		return 0, fmt.Errorf("read error: %s", gvErr.String())
+	}
+
+	return n, nil
+}
+
+func (t *TUN) Write(packet []byte) (int, error) {
+	n := len(packet)
+	if n == 0 {
+		return 0, nil
+	}
+
+	gvErr := rawfile.NonBlockingWrite(t.fd, packet)
+	if gvErr != nil {
+		return 0, fmt.Errorf("write error: %s", gvErr.String())
+	}
+	return n, nil
+}
+
+func (t *TUN) Close() error {
+	return unix.Close(t.fd)
+}
+
+func (t *TUN) UseEndpoint() error {
+	ep, err := fdbased.New(&fdbased.Options{
+		FDs: []int{t.fd},
+		MTU: t.mtu,
+		// TUN only, ignore ethernet header.
+		EthernetHeader: false,
+		// SYS_READV support only for TUN fd.
+		PacketDispatchMode: fdbased.Readv,
+		// TAP/TUN fd's are not sockets and using the WritePackets calls results
+		// in errors as it always defaults to using SendMMsg which is not supported
+		// for tap/tun device fds.
+		//
+		// This CL changes WritePackets to gracefully degrade to using writev instead
+		// of sendmmsg if the underlying fd is not a socket.
+		//
+		// Fixed: https://github.com/google/gvisor/commit/f33d034fecd7723a1e560ccc62aeeba328454fd0
+		MaxSyscallHeaderBytes: 0x00,
+	})
+	if err != nil {
+		return fmt.Errorf("create endpoint: %w", err)
+	}
+	t.LinkEndpoint = ep
+	return nil
+}
+
+func (t *TUN) UseIOBased() error {
+	return nil
+}
+
+// Ref: wireguard tun/tun_linux.go setMTU.
+func setMTU(name string, n uint32) error {
+	// open datagram socket
+	fd, err := unix.Socket(
+		unix.AF_INET,
+		unix.SOCK_DGRAM,
+		0,
+	)
+	if err != nil {
+		return err
+	}
+
+	defer unix.Close(fd)
+
+	const ifReqSize = unix.IFNAMSIZ + 64
+
+	// do ioctl call
+	var ifr [ifReqSize]byte
+	copy(ifr[:], name)
+	*(*uint32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = n
+	_, _, errno := unix.Syscall(
+		unix.SYS_IOCTL,
+		uintptr(fd),
+		uintptr(unix.SIOCSIFMTU),
+		uintptr(unsafe.Pointer(&ifr[0])),
+	)
+
+	if errno != 0 {
+		return fmt.Errorf("failed to set MTU: %w", errno)
+	}
+
+	return nil
+}

listener/tun/device/tun/tun_windows.go

@@ -0,0 +1,17 @@
+package tun
+
+import (
+	"golang.org/x/sys/windows"
+	"golang.zx2c4.com/wireguard/tun"
+)
+
+func init() {
+	guid, _ := windows.GUIDFromString("{330EAEF8-7578-5DF2-D97B-8DADC0EA85CB}")
+
+	tun.WintunTunnelType = "Clash"
+	tun.WintunStaticRequestedGUID = &guid
+}
+
+func (t *TUN) LUID() uint64 {
+	return t.nt.LUID()
+}

listener/tun/device/tun/tun_wireguard.go

@@ -0,0 +1,117 @@
+//go:build !linux
+
+package tun
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/listener/tun/device"
+	"github.com/Dreamacro/clash/listener/tun/device/iobased"
+
+	"golang.zx2c4.com/wireguard/tun"
+)
+
+type TUN struct {
+	*iobased.Endpoint
+
+	nt     *tun.NativeTun
+	mtu    uint32
+	name   string
+	offset int
+}
+
+func Open(name string, mtu uint32) (_ device.Device, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = fmt.Errorf("open tun: %v", r)
+		}
+	}()
+
+	var (
+		offset     = 4 /* 4 bytes TUN_PI */
+		defaultMTU = 1500
+	)
+	if runtime.GOOS == "windows" {
+		offset = 0
+		defaultMTU = 0 /* auto */
+	}
+
+	t := &TUN{
+		name:   name,
+		mtu:    mtu,
+		offset: offset,
+	}
+
+	forcedMTU := defaultMTU
+	if t.mtu > 0 {
+		forcedMTU = int(t.mtu)
+	}
+
+	nt, err := tun.CreateTUN(t.name, forcedMTU) // forcedMTU do not work on wintun, need to be setting by other way
+	if err != nil {
+		return nil, fmt.Errorf("create tun: %w", err)
+	}
+	t.nt = nt.(*tun.NativeTun)
+
+	tunMTU, err := nt.MTU()
+	if err != nil {
+		return nil, fmt.Errorf("get mtu: %w", err)
+	}
+	t.mtu = uint32(tunMTU)
+
+	return t, nil
+}
+
+func (t *TUN) Read(packet []byte) (int, error) {
+	if t.offset == 0 {
+		return t.nt.Read(packet, t.offset)
+	}
+
+	buff := pool.Get(t.offset + cap(packet))
+	defer pool.Put(buff)
+
+	n, err := t.nt.Read(buff, t.offset)
+	if err != nil {
+		return 0, err
+	}
+
+	_ = buff[:t.offset]
+
+	copy(packet, buff[t.offset:t.offset+n])
+
+	return n, err
+}
+
+func (t *TUN) Write(packet []byte) (int, error) {
+	if t.offset == 0 {
+		return t.nt.Write(packet, t.offset)
+	}
+
+	packet = append(make([]byte, t.offset), packet...)
+
+	return t.nt.Write(packet, t.offset)
+}
+
+func (t *TUN) Close() error {
+	return t.nt.Close()
+}
+
+func (t *TUN) Name() string {
+	name, _ := t.nt.Name()
+	return name
+}
+
+func (t *TUN) UseEndpoint() error {
+	ep, err := iobased.New(t, t.mtu, t.offset)
+	if err != nil {
+		return fmt.Errorf("create endpoint: %w", err)
+	}
+	t.Endpoint = ep
+	return nil
+}
+
+func (t *TUN) UseIOBased() error {
+	return nil
+}

listener/tun/ipstack/commons/dns.go

@@ -1,10 +1,24 @@
 package commons
 
 import (
+	"net/netip"
+	"time"
+
 	"github.com/Dreamacro/clash/component/resolver"
 	D "github.com/miekg/dns"
 )
 
+const DefaultDnsReadTimeout = time.Second * 10
+
+func ShouldHijackDns(dnsAdds []netip.AddrPort, targetAddr netip.AddrPort) bool {
+	for _, addrPort := range dnsAdds {
+		if addrPort == targetAddr || (addrPort.Addr().IsUnspecified() && targetAddr.Port() == 53) {
+			return true
+		}
+	}
+	return false
+}
+
 func RelayDnsPacket(payload []byte) ([]byte, error) {
 	msg := &D.Msg{}
 	if err := msg.Unpack(payload); err != nil {

listener/tun/ipstack/commons/router.go

@@ -0,0 +1,17 @@
+package commons
+
+import (
+	"fmt"
+	"net"
+)
+
+var Routes = []string{"1.0.0.0/8", "2.0.0.0/7", "4.0.0.0/6", "8.0.0.0/5", "16.0.0.0/4", "32.0.0.0/3", "64.0.0.0/2", "128.0.0.0/1"}
+
+func IPv4MaskString(bits int) string {
+	m := net.CIDRMask(bits, 32)
+	if len(m) != 4 {
+		panic("ipv4Mask: len must be 4 bytes")
+	}
+
+	return fmt.Sprintf("%d.%d.%d.%d", m[0], m[1], m[2], m[3])
+}

listener/tun/ipstack/commons/router_darwin.go

@@ -0,0 +1,61 @@
+package commons
+
+import (
+	"fmt"
+	"net/netip"
+
+	"github.com/Dreamacro/clash/common/cmd"
+	"github.com/Dreamacro/clash/listener/tun/device"
+)
+
+func GetAutoDetectInterface() (string, error) {
+	return cmd.ExecCmd("bash -c netstat -rnf inet | grep 'default' | awk -F ' ' 'NR==1{print $6}' | xargs echo -n")
+}
+
+func ConfigInterfaceAddress(dev device.Device, addr netip.Prefix, forceMTU int, autoRoute bool) error {
+	if !addr.Addr().Is4() {
+		return fmt.Errorf("supported ipv4 only")
+	}
+
+	var (
+		interfaceName = dev.Name()
+		ip            = addr.Masked().Addr().Next()
+		gw            = ip
+		netmask       = IPv4MaskString(addr.Bits())
+	)
+
+	cmdStr := fmt.Sprintf("ifconfig %s inet %s netmask %s %s", interfaceName, ip, netmask, gw)
+
+	_, err := cmd.ExecCmd(cmdStr)
+	if err != nil {
+		return err
+	}
+
+	// _, err = cmd.ExecCmd(fmt.Sprintf("ipconfig set %s automatic-v6", interfaceName))
+	// if err != nil {
+	//	return err
+	// }
+
+	if autoRoute {
+		err = configInterfaceRouting(interfaceName, addr)
+	}
+	return err
+}
+
+func configInterfaceRouting(interfaceName string, addr netip.Prefix) error {
+	routes := append(Routes, addr.String())
+
+	for _, route := range routes {
+		if err := execRouterCmd("add", "-inet", route, interfaceName); err != nil {
+			return err
+		}
+	}
+
+	// return execRouterCmd("add", "-inet6", "2000::/3", interfaceName)
+	return nil
+}
+
+func execRouterCmd(action, inet, route string, interfaceName string) error {
+	_, err := cmd.ExecCmd(fmt.Sprintf("route %s %s %s -interface %s", action, inet, route, interfaceName))
+	return err
+}

listener/tun/ipstack/commons/router_linux.go

@@ -0,0 +1,52 @@
+package commons
+
+import (
+	"fmt"
+	"net/netip"
+
+	"github.com/Dreamacro/clash/common/cmd"
+	"github.com/Dreamacro/clash/listener/tun/device"
+)
+
+func GetAutoDetectInterface() (string, error) {
+	return cmd.ExecCmd("bash -c ip route show | grep 'default via' | awk -F ' ' 'NR==1{print $5}' | xargs echo -n")
+}
+
+func ConfigInterfaceAddress(dev device.Device, addr netip.Prefix, forceMTU int, autoRoute bool) error {
+	var (
+		interfaceName = dev.Name()
+		ip            = addr.Masked().Addr().Next()
+	)
+
+	_, err := cmd.ExecCmd(fmt.Sprintf("ip addr add %s dev %s", ip.String(), interfaceName))
+	if err != nil {
+		return err
+	}
+
+	_, err = cmd.ExecCmd(fmt.Sprintf("ip link set %s up", interfaceName))
+	if err != nil {
+		return err
+	}
+
+	if autoRoute {
+		err = configInterfaceRouting(interfaceName, addr)
+	}
+	return err
+}
+
+func configInterfaceRouting(interfaceName string, addr netip.Prefix) error {
+	linkIP := addr.Masked().Addr().Next()
+	for _, route := range Routes {
+		if err := execRouterCmd("add", route, interfaceName, linkIP.String()); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func execRouterCmd(action, route string, interfaceName string, linkIP string) error {
+	cmdStr := fmt.Sprintf("ip route %s %s dev %s proto kernel scope link src %s", action, route, interfaceName, linkIP)
+
+	_, err := cmd.ExecCmd(cmdStr)
+	return err
+}

listener/tun/ipstack/commons/router_others.go

@@ -0,0 +1,19 @@
+//go:build !darwin && !linux && !windows
+
+package commons
+
+import (
+	"fmt"
+	"net/netip"
+	"runtime"
+
+	"github.com/Dreamacro/clash/listener/tun/device"
+)
+
+func GetAutoDetectInterface() (string, error) {
+	return "", fmt.Errorf("can not auto detect interface-name on this OS: %s, you must be detecting interface-name by manual", runtime.GOOS)
+}
+
+func ConfigInterfaceAddress(device.Device, netip.Prefix, int, bool) error {
+	return fmt.Errorf("unsupported on this OS: %s", runtime.GOOS)
+}

listener/tun/ipstack/commons/router_windows.go

@@ -0,0 +1,261 @@
+package commons
+
+import (
+	"errors"
+	"fmt"
+	"net/netip"
+	"time"
+
+	"github.com/Dreamacro/clash/listener/tun/device"
+	"github.com/Dreamacro/clash/listener/tun/device/tun"
+	"github.com/Dreamacro/clash/log"
+
+	"golang.org/x/sys/windows"
+	"golang.zx2c4.com/wireguard/windows/services"
+	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
+)
+
+func GetAutoDetectInterface() (string, error) {
+	ifname, err := getAutoDetectInterfaceByFamily(winipcfg.AddressFamily(windows.AF_INET))
+	if err == nil {
+		return ifname, err
+	}
+
+	return getAutoDetectInterfaceByFamily(winipcfg.AddressFamily(windows.AF_INET6))
+}
+
+func ConfigInterfaceAddress(dev device.Device, addr netip.Prefix, forceMTU int, autoRoute bool) error {
+	retryOnFailure := services.StartedAtBoot()
+	tryTimes := 0
+	var err error
+startOver:
+	if tryTimes > 0 {
+		log.Infoln("Retrying interface configuration after failure because system just booted (T+%v): %v", windows.DurationSinceBoot(), err)
+		time.Sleep(time.Second)
+		retryOnFailure = retryOnFailure && tryTimes < 15
+	}
+	tryTimes++
+
+	var (
+		luid      = winipcfg.LUID(dev.(*tun.TUN).LUID())
+		ip        = addr.Masked().Addr().Next()
+		addresses = []netip.Prefix{netip.PrefixFrom(ip, addr.Bits())}
+
+		family4       = winipcfg.AddressFamily(windows.AF_INET)
+		familyV6      = winipcfg.AddressFamily(windows.AF_INET6)
+		currentFamily = winipcfg.AddressFamily(windows.AF_INET6)
+	)
+
+	if addr.Addr().Is4() {
+		currentFamily = winipcfg.AddressFamily(windows.AF_INET)
+	}
+
+	err = luid.FlushRoutes(windows.AF_INET6)
+	if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+		goto startOver
+	} else if err != nil {
+		return err
+	}
+	err = luid.FlushIPAddresses(windows.AF_INET6)
+	if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+		goto startOver
+	} else if err != nil {
+		return err
+	}
+	err = luid.FlushDNS(windows.AF_INET6)
+	if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+		goto startOver
+	} else if err != nil {
+		return err
+	}
+	err = luid.FlushDNS(windows.AF_INET)
+	if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+		goto startOver
+	} else if err != nil {
+		return err
+	}
+
+	foundDefault4 := false
+	foundDefault6 := false
+
+	if autoRoute {
+		var (
+			allowedIPs []netip.Prefix
+
+			// add default
+			routeArr = []string{"0.0.0.0/0"}
+		)
+
+		for _, route := range routeArr {
+			allowedIPs = append(allowedIPs, netip.MustParsePrefix(route))
+		}
+
+		estimatedRouteCount := len(allowedIPs)
+		routes := make(map[winipcfg.RouteData]bool, estimatedRouteCount)
+
+		for _, allowedip := range allowedIPs {
+			route := winipcfg.RouteData{
+				Destination: allowedip.Masked(),
+				Metric:      0,
+			}
+			if allowedip.Addr().Is4() {
+				if allowedip.Bits() == 0 {
+					foundDefault4 = true
+				}
+				route.NextHop = netip.IPv4Unspecified()
+			} else if allowedip.Addr().Is6() {
+				if allowedip.Bits() == 0 {
+					foundDefault6 = true
+				}
+				route.NextHop = netip.IPv6Unspecified()
+			}
+			routes[route] = true
+		}
+
+		deduplicatedRoutes := make([]*winipcfg.RouteData, 0, len(routes))
+		for route := range routes {
+			r := route
+			deduplicatedRoutes = append(deduplicatedRoutes, &r)
+		}
+
+		// add gateway
+		deduplicatedRoutes = append(deduplicatedRoutes, &winipcfg.RouteData{
+			Destination: addr.Masked(),
+			NextHop:     addr.Masked().Addr().Next().Next(),
+			Metric:      0,
+		})
+
+		err = luid.SetRoutesForFamily(currentFamily, deduplicatedRoutes)
+		if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+			goto startOver
+		} else if err != nil {
+			return fmt.Errorf("unable to set routes: %w", err)
+		}
+	}
+
+	err = luid.SetIPAddressesForFamily(currentFamily, addresses)
+	if err == windows.ERROR_OBJECT_ALREADY_EXISTS {
+		cleanupAddressesOnDisconnectedInterfaces(currentFamily, addresses)
+		err = luid.SetIPAddressesForFamily(currentFamily, addresses)
+	}
+	if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+		goto startOver
+	} else if err != nil {
+		return fmt.Errorf("unable to set ips: %w", err)
+	}
+
+	var ipif *winipcfg.MibIPInterfaceRow
+	ipif, err = luid.IPInterface(family4)
+	if err != nil {
+		return err
+	}
+	ipif.ForwardingEnabled = true
+	ipif.RouterDiscoveryBehavior = winipcfg.RouterDiscoveryDisabled
+	ipif.DadTransmits = 0
+	ipif.ManagedAddressConfigurationSupported = false
+	ipif.OtherStatefulConfigurationSupported = false
+	if forceMTU > 0 {
+		ipif.NLMTU = uint32(forceMTU)
+	}
+	if foundDefault4 {
+		ipif.UseAutomaticMetric = false
+		ipif.Metric = 0
+	}
+	err = ipif.Set()
+	if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+		goto startOver
+	} else if err != nil {
+		return fmt.Errorf("unable to set metric and MTU: %w", err)
+	}
+
+	var ipif6 *winipcfg.MibIPInterfaceRow
+	ipif6, err = luid.IPInterface(familyV6)
+	if err != nil {
+		return err
+	}
+	ipif6.RouterDiscoveryBehavior = winipcfg.RouterDiscoveryDisabled
+	ipif6.DadTransmits = 0
+	ipif6.ManagedAddressConfigurationSupported = false
+	ipif6.OtherStatefulConfigurationSupported = false
+	if forceMTU > 0 {
+		ipif6.NLMTU = uint32(forceMTU)
+	}
+	if foundDefault6 {
+		ipif6.UseAutomaticMetric = false
+		ipif6.Metric = 0
+	}
+	err = ipif6.Set()
+	if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+		goto startOver
+	} else if err != nil {
+		return fmt.Errorf("unable to set v6 metric and MTU: %w", err)
+	}
+
+	dnsAdds := []netip.Addr{netip.MustParseAddr("198.18.0.2")}
+	err = luid.SetDNS(family4, dnsAdds, nil)
+	if err == windows.ERROR_NOT_FOUND && retryOnFailure {
+		goto startOver
+	} else if err != nil {
+		return fmt.Errorf("unable to set DNS %s %s: %w", "198.18.0.2", "nil", err)
+	}
+
+	return nil
+}
+
+func cleanupAddressesOnDisconnectedInterfaces(family winipcfg.AddressFamily, addresses []netip.Prefix) {
+	if len(addresses) == 0 {
+		return
+	}
+	addrHash := make(map[netip.Addr]bool, len(addresses))
+	for i := range addresses {
+		addrHash[addresses[i].Addr()] = true
+	}
+	interfaces, err := winipcfg.GetAdaptersAddresses(family, winipcfg.GAAFlagDefault)
+	if err != nil {
+		return
+	}
+	for _, iface := range interfaces {
+		if iface.OperStatus == winipcfg.IfOperStatusUp {
+			continue
+		}
+		for address := iface.FirstUnicastAddress; address != nil; address = address.Next {
+			if ip, _ := netip.AddrFromSlice(address.Address.IP()); addrHash[ip] {
+				prefix := netip.PrefixFrom(ip, int(address.OnLinkPrefixLength))
+				log.Infoln("Cleaning up stale address %s from interface ‘%s’", prefix.String(), iface.FriendlyName())
+				_ = iface.LUID.DeleteIPAddress(prefix)
+			}
+		}
+	}
+}
+
+func getAutoDetectInterfaceByFamily(family winipcfg.AddressFamily) (string, error) {
+	interfaces, err := winipcfg.GetAdaptersAddresses(family, winipcfg.GAAFlagIncludeGateways)
+	if err != nil {
+		return "", fmt.Errorf("get ethernet interface failure. %w", err)
+	}
+
+	var destination netip.Prefix
+	if family == windows.AF_INET {
+		destination = netip.PrefixFrom(netip.IPv4Unspecified(), 0)
+	} else {
+		destination = netip.PrefixFrom(netip.IPv6Unspecified(), 0)
+	}
+
+	for _, iface := range interfaces {
+		if iface.OperStatus != winipcfg.IfOperStatusUp {
+			continue
+		}
+
+		ifname := iface.FriendlyName()
+
+		for gatewayAddress := iface.FirstGatewayAddress; gatewayAddress != nil; gatewayAddress = gatewayAddress.Next {
+			nextHop, _ := netip.AddrFromSlice(gatewayAddress.Address.IP())
+
+			if _, err = iface.LUID.Route(destination, nextHop); err == nil {
+				return ifname, nil
+			}
+		}
+	}
+
+	return "", errors.New("ethernet interface not found")
+}

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

@@ -0,0 +1,24 @@
+package adapter
+
+import (
+	"net"
+
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+// TCPConn implements the net.Conn interface.
+type TCPConn interface {
+	net.Conn
+
+	// ID returns the transport endpoint id of TCPConn.
+	ID() *stack.TransportEndpointID
+}
+
+// UDPConn implements net.Conn and net.PacketConn.
+type UDPConn interface {
+	net.Conn
+	net.PacketConn
+
+	// ID returns the transport endpoint id of UDPConn.
+	ID() *stack.TransportEndpointID
+}

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

@@ -0,0 +1,8 @@
+package adapter
+
+// Handler is a TCP/UDP connection handler that implements
+// HandleTCPConn and HandleUDPConn methods.
+type Handler interface {
+	HandleTCPConn(TCPConn)
+	HandleUDPConn(UDPConn)
+}

listener/tun/ipstack/gvisor/handler.go

@@ -0,0 +1,134 @@
+package gvisor
+
+import (
+	"encoding/binary"
+	"net"
+	"net/netip"
+	"time"
+
+	"github.com/Dreamacro/clash/adapter/inbound"
+	"github.com/Dreamacro/clash/common/pool"
+	C "github.com/Dreamacro/clash/constant"
+	D "github.com/Dreamacro/clash/listener/tun/ipstack/commons"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/adapter"
+	"github.com/Dreamacro/clash/log"
+	"github.com/Dreamacro/clash/transport/socks5"
+)
+
+var _ adapter.Handler = (*GVHandler)(nil)
+
+type GVHandler struct {
+	DNSAdds []netip.AddrPort
+
+	TCPIn chan<- C.ConnContext
+	UDPIn chan<- *inbound.PacketAdapter
+}
+
+func (gh *GVHandler) HandleTCPConn(tunConn adapter.TCPConn) {
+	id := tunConn.ID()
+
+	rAddr := &net.UDPAddr{
+		IP:   net.IP(id.LocalAddress),
+		Port: int(id.LocalPort),
+		Zone: "",
+	}
+
+	addrIp, _ := netip.AddrFromSlice(rAddr.IP)
+	addrPort := netip.AddrPortFrom(addrIp, id.LocalPort)
+
+	if D.ShouldHijackDns(gh.DNSAdds, addrPort) {
+		go func() {
+			log.Debugln("[TUN] hijack dns tcp: %s", addrPort.String())
+
+			defer tunConn.Close()
+
+			buf := pool.Get(pool.UDPBufferSize)
+			defer pool.Put(buf)
+
+			for {
+				tunConn.SetReadDeadline(time.Now().Add(D.DefaultDnsReadTimeout))
+
+				length := uint16(0)
+				if err := binary.Read(tunConn, binary.BigEndian, &length); err != nil {
+					break
+				}
+
+				if int(length) > len(buf) {
+					break
+				}
+
+				n, err := tunConn.Read(buf[:length])
+				if err != nil {
+					break
+				}
+
+				msg, err := D.RelayDnsPacket(buf[:n])
+				if err != nil {
+					break
+				}
+
+				_, _ = tunConn.Write(msg)
+			}
+		}()
+
+		return
+	}
+
+	gh.TCPIn <- inbound.NewSocket(socks5.ParseAddrToSocksAddr(rAddr), tunConn, C.TUN)
+}
+
+func (gh *GVHandler) HandleUDPConn(tunConn adapter.UDPConn) {
+	id := tunConn.ID()
+
+	rAddr := &net.UDPAddr{
+		IP:   net.IP(id.LocalAddress),
+		Port: int(id.LocalPort),
+		Zone: "",
+	}
+
+	addrIp, _ := netip.AddrFromSlice(rAddr.IP)
+	addrPort := netip.AddrPortFrom(addrIp, id.LocalPort)
+	target := socks5.ParseAddrToSocksAddr(rAddr)
+
+	go func() {
+		for {
+			buf := pool.Get(pool.UDPBufferSize)
+
+			n, addr, err := tunConn.ReadFrom(buf)
+			if err != nil {
+				pool.Put(buf)
+				break
+			}
+
+			payload := buf[:n]
+
+			if D.ShouldHijackDns(gh.DNSAdds, addrPort) {
+				go func() {
+					defer pool.Put(buf)
+
+					msg, err1 := D.RelayDnsPacket(payload)
+					if err1 != nil {
+						return
+					}
+
+					_, _ = tunConn.WriteTo(msg, addr)
+
+					log.Debugln("[TUN] hijack dns udp: %s", rAddr.String())
+				}()
+
+				continue
+			}
+
+			gvPacket := &packet{
+				pc:      tunConn,
+				rAddr:   addr,
+				payload: payload,
+			}
+
+			select {
+			case gh.UDPIn <- inbound.NewPacket(target, gvPacket, C.TUN):
+			default:
+			}
+		}
+	}()
+}

listener/tun/ipstack/gvisor/icmp.go

@@ -0,0 +1,24 @@
+package gvisor
+
+import (
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+)
+
+func withICMPHandler() Option {
+	return func(s *gvStack) 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,
+			},
+			{
+				Destination: header.IPv6EmptySubnet,
+				NIC:         s.nicID,
+			},
+		})
+		return nil
+	}
+}

listener/tun/ipstack/gvisor/nic.go

@@ -0,0 +1,59 @@
+package gvisor
+
+import (
+	"fmt"
+
+	"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
+
+	// nicSpoofingEnabled is the value used by stack to enable or disable
+	// NIC's spoofing.
+	nicSpoofingEnabled = true
+)
+
+// withCreatingNIC creates NIC for stack.
+func withCreatingNIC(ep stack.LinkEndpoint) Option {
+	return func(s *gvStack) error {
+		if err := s.CreateNICWithOptions(s.nicID, ep,
+			stack.NICOptions{
+				Disabled: false,
+				// If no queueing discipline was specified
+				// provide a stub implementation that just
+				// delegates to the lower link endpoint.
+				QDisc: nil,
+			}); err != nil {
+			return fmt.Errorf("create NIC: %s", err)
+		}
+		return nil
+	}
+}
+
+// withPromiscuousMode sets promiscuous mode in the given NIC.
+func withPromiscuousMode(v bool) Option {
+	return func(s *gvStack) error {
+		if err := s.SetPromiscuousMode(s.nicID, v); err != nil {
+			return fmt.Errorf("set promiscuous mode: %s", err)
+		}
+		return nil
+	}
+}
+
+// withSpoofing sets address spoofing in the given NIC, allowing
+// endpoints to bind to any address in the NIC.
+func withSpoofing(v bool) Option {
+	return func(s *gvStack) error {
+		if err := s.SetSpoofing(s.nicID, v); err != nil {
+			return fmt.Errorf("set spoofing: %s", err)
+		}
+		return nil
+	}
+}

listener/tun/ipstack/gvisor/opts.go

@@ -0,0 +1,223 @@
+package gvisor
+
+import (
+	"fmt"
+
+	"golang.org/x/time/rate"
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
+	"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+)
+
+const (
+	// defaultTimeToLive specifies the default TTL used by stack.
+	defaultTimeToLive uint8 = 64
+
+	// ipForwardingEnabled is the value used by stack to enable packet
+	// forwarding between NICs.
+	ipForwardingEnabled = true
+
+	// icmpBurst is the default number of ICMP messages that can be sent in
+	// a single burst.
+	icmpBurst = 50
+
+	// icmpLimit is the default maximum number of ICMP messages permitted
+	// by this rate limiter.
+	icmpLimit rate.Limit = 1000
+
+	// tcpCongestionControl is the congestion control algorithm used by
+	// stack. ccReno is the default option in gVisor stack.
+	tcpCongestionControlAlgorithm = "reno" // "reno" or "cubic"
+
+	// tcpDelayEnabled is the value used by stack to enable or disable
+	// tcp delay option. Disable Nagle's algorithm here by default.
+	tcpDelayEnabled = false
+
+	// tcpModerateReceiveBufferEnabled is the value used by stack to
+	// enable or disable tcp receive buffer auto-tuning option.
+	tcpModerateReceiveBufferEnabled = true
+
+	// tcpSACKEnabled is the value used by stack to enable or disable
+	// tcp selective ACK.
+	tcpSACKEnabled = true
+
+	// tcpRecovery is the loss detection algorithm used by TCP.
+	tcpRecovery = tcpip.TCPRACKLossDetection
+
+	// tcpMinBufferSize is the smallest size of a send/recv buffer.
+	tcpMinBufferSize = tcp.MinBufferSize // 4 KiB
+
+	// tcpMaxBufferSize is the maximum permitted size of a send/recv buffer.
+	tcpMaxBufferSize = tcp.MaxBufferSize // 4 MiB
+
+	// tcpDefaultBufferSize is the default size of the send/recv buffer for
+	// a transport endpoint.
+	tcpDefaultBufferSize = 212 << 10 // 212 KiB
+)
+
+type Option func(*gvStack) error
+
+// WithDefault sets all default values for stack.
+func WithDefault() Option {
+	return func(s *gvStack) error {
+		opts := []Option{
+			WithDefaultTTL(defaultTimeToLive),
+			WithForwarding(ipForwardingEnabled),
+
+			// Config default stack ICMP settings.
+			WithICMPBurst(icmpBurst), WithICMPLimit(icmpLimit),
+
+			// We expect no packet loss, therefore we can bump buffers.
+			// Too large buffers thrash cache, so there is little point
+			// in too large buffers.
+			//
+			// Ref: https://github.com/cloudflare/slirpnetstack/blob/master/stack.go
+			WithTCPBufferSizeRange(tcpMinBufferSize, tcpDefaultBufferSize, tcpMaxBufferSize),
+
+			WithTCPCongestionControl(tcpCongestionControlAlgorithm),
+			WithTCPDelay(tcpDelayEnabled),
+
+			// Receive Buffer Auto-Tuning Option, see:
+			// https://github.com/google/gvisor/issues/1666
+			WithTCPModerateReceiveBuffer(tcpModerateReceiveBufferEnabled),
+
+			// TCP selective ACK Option, see:
+			// https://tools.ietf.org/html/rfc2018
+			WithTCPSACKEnabled(tcpSACKEnabled),
+
+			// TCPRACKLossDetection: indicates RACK is used for loss detection and
+			// recovery.
+			//
+			// TCPRACKStaticReoWnd: indicates the reordering window should not be
+			// adjusted when DSACK is received.
+			//
+			// TCPRACKNoDupTh: indicates RACK should not consider the classic three
+			// duplicate acknowledgements rule to mark the segments as lost. This
+			// is used when reordering is not detected.
+			WithTCPRecovery(tcpRecovery),
+		}
+
+		for _, opt := range opts {
+			if err := opt(s); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	}
+}
+
+// WithDefaultTTL sets the default TTL used by stack.
+func WithDefaultTTL(ttl uint8) Option {
+	return func(s *gvStack) error {
+		opt := tcpip.DefaultTTLOption(ttl)
+		if err := s.SetNetworkProtocolOption(ipv4.ProtocolNumber, &opt); err != nil {
+			return fmt.Errorf("set ipv4 default TTL: %s", err)
+		}
+		if err := s.SetNetworkProtocolOption(ipv6.ProtocolNumber, &opt); err != nil {
+			return fmt.Errorf("set ipv6 default TTL: %s", err)
+		}
+		return nil
+	}
+}
+
+// WithForwarding sets packet forwarding between NICs for IPv4 & IPv6.
+func WithForwarding(v bool) Option {
+	return func(s *gvStack) error {
+		if err := s.SetForwardingDefaultAndAllNICs(ipv4.ProtocolNumber, v); err != nil {
+			return fmt.Errorf("set ipv4 forwarding: %s", err)
+		}
+		if err := s.SetForwardingDefaultAndAllNICs(ipv6.ProtocolNumber, v); err != nil {
+			return fmt.Errorf("set ipv6 forwarding: %s", err)
+		}
+		return nil
+	}
+}
+
+// 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 {
+		s.SetICMPBurst(burst)
+		return nil
+	}
+}
+
+// WithICMPLimit sets the maximum number of ICMP messages permitted
+// by rate limiter.
+func WithICMPLimit(limit rate.Limit) Option {
+	return func(s *gvStack) error {
+		s.SetICMPLimit(limit)
+		return nil
+	}
+}
+
+// WithTCPBufferSizeRange sets the receive and send buffer size range for TCP.
+func WithTCPBufferSizeRange(a, b, c int) Option {
+	return func(s *gvStack) 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)
+		}
+		sndOpt := tcpip.TCPSendBufferSizeRangeOption{Min: a, Default: b, Max: c}
+		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &sndOpt); err != nil {
+			return fmt.Errorf("set TCP send buffer size range: %s", err)
+		}
+		return nil
+	}
+}
+
+// WithTCPCongestionControl sets the current congestion control algorithm.
+func WithTCPCongestionControl(cc string) Option {
+	return func(s *gvStack) error {
+		opt := tcpip.CongestionControlOption(cc)
+		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
+			return fmt.Errorf("set TCP congestion control algorithm: %s", err)
+		}
+		return nil
+	}
+}
+
+// WithTCPDelay enables or disables Nagle's algorithm in TCP.
+func WithTCPDelay(v bool) Option {
+	return func(s *gvStack) error {
+		opt := tcpip.TCPDelayEnabled(v)
+		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
+			return fmt.Errorf("set TCP delay: %s", err)
+		}
+		return nil
+	}
+}
+
+// WithTCPModerateReceiveBuffer sets receive buffer moderation for TCP.
+func WithTCPModerateReceiveBuffer(v bool) Option {
+	return func(s *gvStack) error {
+		opt := tcpip.TCPModerateReceiveBufferOption(v)
+		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
+			return fmt.Errorf("set TCP moderate receive buffer: %s", err)
+		}
+		return nil
+	}
+}
+
+// WithTCPSACKEnabled sets the SACK option for TCP.
+func WithTCPSACKEnabled(v bool) Option {
+	return func(s *gvStack) error {
+		opt := tcpip.TCPSACKEnabled(v)
+		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &opt); err != nil {
+			return fmt.Errorf("set TCP SACK: %s", err)
+		}
+		return nil
+	}
+}
+
+// WithTCPRecovery sets the recovery option for TCP.
+func WithTCPRecovery(v tcpip.TCPRecovery) Option {
+	return func(s *gvStack) error {
+		if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, &v); err != nil {
+			return fmt.Errorf("set TCP Recovery: %s", err)
+		}
+		return nil
+	}
+}

listener/tun/ipstack/gvisor/stack.go

@@ -0,0 +1,96 @@
+// Package gvisor provides a thin wrapper around a gVisor's stack.
+package gvisor
+
+import (
+	"github.com/Dreamacro/clash/listener/tun/device"
+	"github.com/Dreamacro/clash/listener/tun/ipstack"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/adapter"
+
+	"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/icmp"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
+)
+
+type gvStack struct {
+	*stack.Stack
+	device device.Device
+
+	handler adapter.Handler
+	nicID   tcpip.NICID
+}
+
+func (s *gvStack) Close() error {
+	if s.Stack != nil {
+		s.Stack.Close()
+	}
+	if s.device != nil {
+		_ = 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) {
+	s := &gvStack{
+		Stack: stack.New(stack.Options{
+			NetworkProtocols: []stack.NetworkProtocolFactory{
+				ipv4.NewProtocol,
+				ipv6.NewProtocol,
+			},
+			TransportProtocols: []stack.TransportProtocolFactory{
+				tcp.NewProtocol,
+				udp.NewProtocol,
+				icmp.NewProtocol4,
+				icmp.NewProtocol6,
+			},
+		}),
+
+		device:  device,
+		handler: handler,
+		nicID:   defaultNICID,
+	}
+
+	opts = append(opts,
+		// Important: We must initiate transport protocol handlers
+		// 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.
+		withCreatingNIC(device.(stack.LinkEndpoint)),
+
+		// 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
+		// all the incoming connections - to any ip. AddressRange API
+		// has been removed and the suggested workaround is to use
+		// Promiscuous mode. https://github.com/google/gvisor/issues/3876
+		//
+		// Ref: https://github.com/cloudflare/slirpnetstack/blob/master/stack.go
+		withPromiscuousMode(nicPromiscuousModeEnabled),
+
+		// Enable spoofing if a stack may send packets from unowned addresses.
+		// This change required changes to some netgophers since previously,
+		// promiscuous mode was enough to let the netstack respond to all
+		// incoming packets regardless of the packet's destination address. Now
+		// that a stack.Route is not held for each incoming packet, finding a route
+		// may fail with local addresses we don't own but accepted packets for
+		// while in promiscuous mode. Since we also want to be able to send 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),
+	)
+
+	for _, opt := range opts {
+		if err := opt(s); err != nil {
+			return nil, err
+		}
+	}
+
+	return s, nil
+}

listener/tun/ipstack/gvisor/tcp.go

@@ -0,0 +1,91 @@
+package gvisor
+
+import (
+	"fmt"
+	"time"
+
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+	"gvisor.dev/gvisor/pkg/waiter"
+)
+
+const (
+	// defaultWndSize if set to zero, the default
+	// receive window buffer size is used instead.
+	defaultWndSize = 0
+
+	// maxConnAttempts specifies the maximum number
+	// of in-flight tcp connection attempts.
+	maxConnAttempts = 2 << 10
+
+	// tcpKeepaliveCount is the maximum number of
+	// TCP keep-alive probes to send before giving up
+	// and killing the connection if no response is
+	// obtained from the other end.
+	tcpKeepaliveCount = 9
+
+	// tcpKeepaliveIdle specifies the time a connection
+	// must remain idle before the first TCP keepalive
+	// packet is sent. Once this time is reached,
+	// tcpKeepaliveInterval option is used instead.
+	tcpKeepaliveIdle = 60 * time.Second
+
+	// tcpKeepaliveInterval specifies the interval
+	// time between sending TCP keepalive packets.
+	tcpKeepaliveInterval = 30 * time.Second
+)
+
+func withTCPHandler() Option {
+	return func(s *gvStack) error {
+		tcpForwarder := tcp.NewForwarder(s.Stack, defaultWndSize, maxConnAttempts, func(r *tcp.ForwarderRequest) {
+			var wq waiter.Queue
+			ep, err := r.CreateEndpoint(&wq)
+			if err != nil {
+				// RST: prevent potential half-open TCP connection leak.
+				r.Complete(true)
+				return
+			}
+			defer r.Complete(false)
+
+			setKeepalive(ep)
+
+			conn := &tcpConn{
+				TCPConn: gonet.NewTCPConn(&wq, ep),
+				id:      r.ID(),
+			}
+			s.handler.HandleTCPConn(conn)
+		})
+		s.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)
+		return nil
+	}
+}
+
+func setKeepalive(ep tcpip.Endpoint) error {
+	ep.SocketOptions().SetKeepAlive(true)
+
+	idle := tcpip.KeepaliveIdleOption(tcpKeepaliveIdle)
+	if err := ep.SetSockOpt(&idle); err != nil {
+		return fmt.Errorf("set keepalive idle: %s", err)
+	}
+
+	interval := tcpip.KeepaliveIntervalOption(tcpKeepaliveInterval)
+	if err := ep.SetSockOpt(&interval); err != nil {
+		return fmt.Errorf("set keepalive interval: %s", err)
+	}
+
+	if err := ep.SetSockOptInt(tcpip.KeepaliveCountOption, tcpKeepaliveCount); err != nil {
+		return fmt.Errorf("set keepalive count: %s", err)
+	}
+	return nil
+}
+
+type tcpConn struct {
+	*gonet.TCPConn
+	id stack.TransportEndpointID
+}
+
+func (c *tcpConn) ID() *stack.TransportEndpointID {
+	return &c.id
+}

listener/tun/ipstack/gvisor/tun.go

@@ -1,280 +0,0 @@
-package gvisor
-
-import (
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"net"
-	"strconv"
-	"strings"
-	"sync"
-
-	"github.com/Dreamacro/clash/adapter/inbound"
-	"github.com/Dreamacro/clash/common/pool"
-	"github.com/Dreamacro/clash/component/resolver"
-	"github.com/Dreamacro/clash/config"
-	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/dns"
-	"github.com/Dreamacro/clash/listener/tun/dev"
-	"github.com/Dreamacro/clash/listener/tun/ipstack"
-	"github.com/Dreamacro/clash/log"
-	"github.com/Dreamacro/clash/transport/socks5"
-	"gvisor.dev/gvisor/pkg/tcpip"
-	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
-	"gvisor.dev/gvisor/pkg/tcpip/buffer"
-	"gvisor.dev/gvisor/pkg/tcpip/header"
-	"gvisor.dev/gvisor/pkg/tcpip/link/channel"
-	"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"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
-	"gvisor.dev/gvisor/pkg/waiter"
-)
-
-const nicID tcpip.NICID = 1
-
-type gvisorAdapter struct {
-	device    dev.TunDevice
-	ipstack   *stack.Stack
-	dnsServer *DNSServer
-	udpIn     chan<- *inbound.PacketAdapter
-
-	stackName string
-	autoRoute bool
-	linkCache *channel.Endpoint
-	wg        sync.WaitGroup // wait for goroutines to stop
-
-	writeHandle *channel.NotificationHandle
-}
-
-// GvisorAdapter create GvisorAdapter
-func NewAdapter(device dev.TunDevice, conf config.Tun, tcpIn chan<- C.ConnContext, udpIn chan<- *inbound.PacketAdapter) (ipstack.TunAdapter, error) {
-	ipstack := stack.New(stack.Options{
-		NetworkProtocols:   []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol},
-		TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol},
-	})
-
-	adapter := &gvisorAdapter{
-		device:    device,
-		ipstack:   ipstack,
-		udpIn:     udpIn,
-		stackName: conf.Stack,
-		autoRoute: conf.AutoRoute,
-	}
-
-	linkEP, err := adapter.AsLinkEndpoint()
-	if err != nil {
-		return nil, fmt.Errorf("unable to create virtual endpoint: %v", err)
-	}
-
-	if err := ipstack.CreateNIC(nicID, linkEP); err != nil {
-		return nil, fmt.Errorf("fail to create NIC in ipstack: %v", err)
-	}
-
-	ipstack.SetPromiscuousMode(nicID, true) // Accept all the traffice from this NIC
-	ipstack.SetSpoofing(nicID, true)        // Otherwise our TCP connection can not find the route backward
-
-	// Add route for ipv4 & ipv6
-	// So FindRoute will return correct route to tun NIC
-	subnet, _ := tcpip.NewSubnet(tcpip.Address(strings.Repeat("\x00", 4)), tcpip.AddressMask(strings.Repeat("\x00", 4)))
-	ipstack.AddRoute(tcpip.Route{Destination: subnet, Gateway: "", NIC: nicID})
-	subnet, _ = tcpip.NewSubnet(tcpip.Address(strings.Repeat("\x00", 16)), tcpip.AddressMask(strings.Repeat("\x00", 16)))
-	ipstack.AddRoute(tcpip.Route{Destination: subnet, Gateway: "", NIC: nicID})
-
-	// TCP handler
-	// maximum number of half-open tcp connection set to 1024
-	// receive buffer size set to 20k
-	tcpFwd := tcp.NewForwarder(ipstack, pool.RelayBufferSize, 1024, func(r *tcp.ForwarderRequest) {
-		src := net.JoinHostPort(r.ID().RemoteAddress.String(), strconv.Itoa((int)(r.ID().RemotePort)))
-		dst := net.JoinHostPort(r.ID().LocalAddress.String(), strconv.Itoa((int)(r.ID().LocalPort)))
-		log.Debugln("Get TCP Syn %v -> %s in ipstack", src, dst)
-		var wq waiter.Queue
-		ep, err := r.CreateEndpoint(&wq)
-		if err != nil {
-			log.Warnln("Can't create TCP Endpoint(%s -> %s) in ipstack: %v", src, dst, err)
-			r.Complete(true)
-			return
-		}
-
-		defer r.Complete(false)
-
-		conn := gonet.NewTCPConn(&wq, ep)
-
-		// if the endpoint is not in connected state, conn.RemoteAddr() will return nil
-		// this protection may be not enough, but will help us debug the panic
-		if conn.RemoteAddr() == nil {
-			log.Warnln("TCP endpoint is not connected, current state: %v", tcp.EndpointState(ep.State()))
-			conn.Close()
-			return
-		}
-
-		target := getAddr(ep.Info().(*stack.TransportEndpointInfo).ID)
-		tcpIn <- inbound.NewSocket(target, conn, C.TUN)
-	})
-
-	ipstack.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpFwd.HandlePacket)
-
-	// UDP handler
-	ipstack.SetTransportProtocolHandler(udp.ProtocolNumber, adapter.udpHandlePacket)
-
-	if resolver.DefaultResolver != nil {
-		err = adapter.ReCreateDNSServer(resolver.DefaultResolver.(*dns.Resolver), resolver.DefaultHostMapper.(*dns.ResolverEnhancer), conf.DnsHijack)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return adapter, nil
-}
-
-func (t *gvisorAdapter) Stack() string {
-	return t.stackName
-}
-
-func (t *gvisorAdapter) AutoRoute() bool {
-	return t.autoRoute
-}
-
-// Close close the TunAdapter
-func (t *gvisorAdapter) Close() {
-	t.StopDNSServer()
-	if t.ipstack != nil {
-		t.ipstack.Close()
-	}
-	if t.device != nil {
-		_ = t.device.Close()
-	}
-}
-
-func (t *gvisorAdapter) udpHandlePacket(id stack.TransportEndpointID, pkt *stack.PacketBuffer) bool {
-	// ref: gvisor pkg/tcpip/transport/udp/endpoint.go HandlePacket
-	hdr := header.UDP(pkt.TransportHeader().View())
-	if int(hdr.Length()) > pkt.Data().Size()+header.UDPMinimumSize {
-		// Malformed packet.
-		t.ipstack.Stats().UDP.MalformedPacketsReceived.Increment()
-		return true
-	}
-
-	target := getAddr(id)
-
-	packet := &fakeConn{
-		id:      id,
-		pkt:     pkt,
-		s:       t.ipstack,
-		payload: pkt.Data().AsRange().ToOwnedView(),
-	}
-
-	select {
-	case t.udpIn <- inbound.NewPacket(target, packet, C.TUN):
-	default:
-	}
-
-	return true
-}
-
-// Wait wait goroutines to exit
-func (t *gvisorAdapter) Wait() {
-	t.wg.Wait()
-}
-
-func (t *gvisorAdapter) AsLinkEndpoint() (result stack.LinkEndpoint, err error) {
-	if t.linkCache != nil {
-		return t.linkCache, nil
-	}
-
-	mtu, err := t.device.MTU()
-	if err != nil {
-		return nil, errors.New("unable to get device mtu")
-	}
-
-	linkEP := channel.New(512, uint32(mtu), "")
-
-	// start Read loop. read ip packet from tun and write it to ipstack
-	t.wg.Add(1)
-	go func() {
-		for !t.device.IsClose() {
-			packet := make([]byte, mtu)
-			n, err := t.device.Read(packet)
-			if n == 0 {
-				continue
-			}
-			if err != nil && !t.device.IsClose() {
-				log.Errorln("can not read from tun: %v", err)
-				continue
-			}
-
-			var p tcpip.NetworkProtocolNumber
-			switch header.IPVersion(packet) {
-			case header.IPv4Version:
-				p = header.IPv4ProtocolNumber
-			case header.IPv6Version:
-				p = header.IPv6ProtocolNumber
-			default:
-				log.Warnln("invalid IP version:%d", header.IPVersion(packet))
-				continue
-			}
-
-			if linkEP.IsAttached() {
-				pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
-					Data: buffer.View(packet[:n]).ToVectorisedView(),
-				})
-
-				linkEP.InjectInbound(p, pkt)
-				// release memory
-				pkt.DecRef()
-			} else {
-				log.Debugln("received packet from tun when %s is not attached to any dispatcher.", t.device.Name())
-			}
-		}
-
-		t.wg.Done()
-		t.Close()
-		log.Debugln("%v stop read loop", t.device.Name())
-	}()
-
-	// start write notification
-	t.writeHandle = linkEP.AddNotify(t)
-	t.linkCache = linkEP
-	return t.linkCache, nil
-}
-
-// WriteNotify implements channel.Notification.WriteNotify.
-func (t *gvisorAdapter) WriteNotify() {
-	packetBuffer := t.linkCache.Read()
-	if packetBuffer != nil {
-		var vv buffer.VectorisedView
-		// Append upper headers.
-		vv.AppendView(packetBuffer.NetworkHeader().View())
-		vv.AppendView(packetBuffer.TransportHeader().View())
-		// Append data payload.
-		vv.Append(packetBuffer.Data().ExtractVV())
-
-		_, err := t.device.Write(vv.ToView())
-		if err != nil && !t.device.IsClose() {
-			log.Errorln("can not write to tun: %v", err)
-		}
-	}
-}
-
-func getAddr(id stack.TransportEndpointID) socks5.Addr {
-	ipv4 := id.LocalAddress.To4()
-
-	// get the big-endian binary represent of port
-	port := make([]byte, 2)
-	binary.BigEndian.PutUint16(port, id.LocalPort)
-
-	if ipv4 != "" {
-		addr := make([]byte, 1+net.IPv4len+2)
-		addr[0] = socks5.AtypIPv4
-		copy(addr[1:1+net.IPv4len], []byte(ipv4))
-		addr[1+net.IPv4len], addr[1+net.IPv4len+1] = port[0], port[1]
-		return addr
-	} else {
-		addr := make([]byte, 1+net.IPv6len+2)
-		addr[0] = socks5.AtypIPv6
-		copy(addr[1:1+net.IPv6len], []byte(id.LocalAddress))
-		addr[1+net.IPv6len], addr[1+net.IPv6len+1] = port[0], port[1]
-		return addr
-	}
-}

listener/tun/ipstack/gvisor/tundns.go

@@ -1,433 +0,0 @@
-package gvisor
-
-import (
-	"fmt"
-	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
-	"net"
-
-	Common "github.com/Dreamacro/clash/common/net"
-	"github.com/Dreamacro/clash/dns"
-	"github.com/Dreamacro/clash/log"
-	D "github.com/miekg/dns"
-	"gvisor.dev/gvisor/pkg/tcpip"
-	"gvisor.dev/gvisor/pkg/tcpip/buffer"
-	"gvisor.dev/gvisor/pkg/tcpip/header"
-	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
-	"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
-	"gvisor.dev/gvisor/pkg/tcpip/ports"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
-)
-
-var (
-	ipv4Zero = tcpip.Address(net.IPv4zero.To4())
-	ipv6Zero = tcpip.Address(net.IPv6zero.To16())
-)
-
-type ListenerWrap struct {
-	net.Listener
-	listener net.Listener
-}
-
-func (l *ListenerWrap) Accept() (conn net.Conn, err error) {
-	conn, err = l.listener.Accept()
-	log.Debugln("[DNS] hijack tcp:%s", l.Addr())
-	return
-}
-
-func (l *ListenerWrap) Close() error {
-	return l.listener.Close()
-}
-
-func (l *ListenerWrap) Addr() net.Addr {
-	return l.listener.Addr()
-}
-
-// DNSServer is DNS Server listening on tun devcice
-type DNSServer struct {
-	dnsServers     []*dns.Server
-	tcpListeners   []net.Listener
-	resolver       *dns.Resolver
-	stack          *stack.Stack
-	udpEndpoints   []*dnsEndpoint
-	udpEndpointIDs []*stack.TransportEndpointID
-	tcpip.NICID
-}
-
-// dnsEndpoint is a TransportEndpoint that will register to stack
-type dnsEndpoint struct {
-	stack.TransportEndpoint
-	stack    *stack.Stack
-	uniqueID uint64
-	server   *dns.Server
-}
-
-// Keep track of the source of DNS request
-type dnsResponseWriter struct {
-	s   *stack.Stack
-	pkt *stack.PacketBuffer // The request packet
-	id  stack.TransportEndpointID
-}
-
-func (e *dnsEndpoint) UniqueID() uint64 {
-	return e.uniqueID
-}
-
-func (e *dnsEndpoint) HandlePacket(id stack.TransportEndpointID, pkt *stack.PacketBuffer) {
-	hdr := header.UDP(pkt.TransportHeader().View())
-	if int(hdr.Length()) > pkt.Data().Size()+header.UDPMinimumSize {
-		// Malformed packet.
-		e.stack.Stats().UDP.MalformedPacketsReceived.Increment()
-		return
-	}
-
-	// server DNS
-	var msg D.Msg
-	msg.Unpack(pkt.Data().AsRange().ToOwnedView())
-	writer := dnsResponseWriter{s: e.stack, pkt: pkt, id: id}
-	log.Debugln("[DNS] hijack udp:%s:%d from %s:%d", id.LocalAddress.String(), id.LocalPort,
-		id.RemoteAddress.String(), id.RemotePort)
-	go e.server.ServeDNS(&writer, &msg)
-}
-
-func (e *dnsEndpoint) Close() {
-}
-
-func (e *dnsEndpoint) Wait() {
-}
-
-func (e *dnsEndpoint) HandleError(transErr stack.TransportError, pkt *stack.PacketBuffer) {
-	log.Warnln("DNS endpoint get a transport error: %v", transErr)
-	log.Debugln("DNS endpoint transport error packet : %v", pkt)
-}
-
-// Abort implements stack.TransportEndpoint.Abort.
-func (e *dnsEndpoint) Abort() {
-	e.Close()
-}
-
-func (w *dnsResponseWriter) LocalAddr() net.Addr {
-	return &net.UDPAddr{IP: net.IP(w.id.LocalAddress), Port: int(w.id.LocalPort)}
-}
-
-func (w *dnsResponseWriter) RemoteAddr() net.Addr {
-	return &net.UDPAddr{IP: net.IP(w.id.RemoteAddress), Port: int(w.id.RemotePort)}
-}
-
-func (w *dnsResponseWriter) WriteMsg(msg *D.Msg) error {
-	b, err := msg.Pack()
-	if err != nil {
-		return err
-	}
-	_, err = w.Write(b)
-	return err
-}
-
-func (w *dnsResponseWriter) TsigStatus() error {
-	// Unsupported
-	return nil
-}
-
-func (w *dnsResponseWriter) TsigTimersOnly(bool) {
-	// Unsupported
-}
-
-func (w *dnsResponseWriter) Hijack() {
-	// Unsupported
-}
-
-func (w *dnsResponseWriter) Write(b []byte) (int, error) {
-	v := buffer.NewView(len(b))
-	copy(v, b)
-	data := v.ToVectorisedView()
-
-	// w.id.LocalAddress is the source ip of DNS response
-	if !w.pkt.NetworkHeader().View().IsEmpty() &&
-		(w.pkt.NetworkProtocolNumber == ipv4.ProtocolNumber ||
-			w.pkt.NetworkProtocolNumber == ipv6.ProtocolNumber) {
-		r, _ := w.s.FindRoute(w.pkt.NICID, w.id.LocalAddress, w.id.RemoteAddress, w.pkt.NetworkProtocolNumber, false /* multicastLoop */)
-		return writeUDP(r, data, w.id.LocalPort, w.id.RemotePort)
-	} else {
-		log.Debugln("the network protocl[%d] is not available", w.pkt.NetworkProtocolNumber)
-		return 0, fmt.Errorf("the network protocl[%d] is not available", w.pkt.NetworkProtocolNumber)
-	}
-}
-
-func (w *dnsResponseWriter) Close() error {
-	return nil
-}
-
-// CreateDNSServer create a dns server on given netstack
-func CreateDNSServer(s *stack.Stack, resolver *dns.Resolver, mapper *dns.ResolverEnhancer, dnsHijack []net.Addr, nicID tcpip.NICID) (*DNSServer, error) {
-	var err error
-	handler := dns.NewHandler(resolver, mapper)
-	serverIn := &dns.Server{}
-	serverIn.SetHandler(handler)
-	tcpDnsArr := make([]net.TCPAddr, 0, len(dnsHijack))
-	udpDnsArr := make([]net.UDPAddr, 0, len(dnsHijack))
-	for _, d := range dnsHijack {
-		switch d.(type) {
-		case *net.TCPAddr:
-			{
-				tcpDnsArr = append(tcpDnsArr, *d.(*net.TCPAddr))
-				break
-			}
-		case *net.UDPAddr:
-			{
-				udpDnsArr = append(udpDnsArr, *d.(*net.UDPAddr))
-				break
-			}
-		}
-	}
-
-	endpoints, ids := hijackUdpDns(udpDnsArr, s, serverIn)
-	tcpListeners, dnsServers := hijackTcpDns(tcpDnsArr, s, serverIn)
-	server := &DNSServer{
-		resolver:       resolver,
-		stack:          s,
-		udpEndpoints:   endpoints,
-		udpEndpointIDs: ids,
-		NICID:          nicID,
-		tcpListeners:   tcpListeners,
-	}
-
-	server.dnsServers = dnsServers
-
-	return server, err
-}
-
-func hijackUdpDns(dnsArr []net.UDPAddr, s *stack.Stack, serverIn *dns.Server) ([]*dnsEndpoint, []*stack.TransportEndpointID) {
-	endpoints := make([]*dnsEndpoint, len(dnsArr))
-	ids := make([]*stack.TransportEndpointID, len(dnsArr))
-	for i, dns := range dnsArr {
-		port := dns.Port
-		ip := dns.IP
-		address := tcpip.FullAddress{NIC: nicID, Port: uint16(port)}
-		var protocol tcpip.NetworkProtocolNumber
-		if ip.To4() != nil {
-			address.Addr = tcpip.Address(ip.To4())
-			protocol = ipv4.ProtocolNumber
-
-		} else {
-			address.Addr = tcpip.Address(ip.To16())
-			protocol = ipv6.ProtocolNumber
-		}
-
-		protocolAddr := tcpip.ProtocolAddress{
-			Protocol:          protocol,
-			AddressWithPrefix: address.Addr.WithPrefix(),
-		}
-
-		// netstack will only reassemble IP fragments when its' dest ip address is registered in NIC.endpoints
-		if err := s.AddProtocolAddress(nicID, protocolAddr, stack.AddressProperties{}); err != nil {
-			log.Errorln("AddProtocolAddress(%d, %+v, {}): %s", nicID, protocolAddr, err)
-		}
-
-		if address.Addr == ipv4Zero || address.Addr == ipv6Zero {
-			address.Addr = ""
-		}
-
-		// UDP DNS
-		id := &stack.TransportEndpointID{
-			LocalAddress:  address.Addr,
-			LocalPort:     uint16(port),
-			RemotePort:    0,
-			RemoteAddress: "",
-		}
-
-		// TransportEndpoint for DNS
-		endpoint := &dnsEndpoint{
-			stack:    s,
-			uniqueID: s.UniqueID(),
-			server:   serverIn,
-		}
-
-		if tcpiperr := s.RegisterTransportEndpoint(
-			[]tcpip.NetworkProtocolNumber{
-				ipv4.ProtocolNumber,
-				ipv6.ProtocolNumber,
-			},
-			udp.ProtocolNumber,
-			*id,
-			endpoint,
-			ports.Flags{LoadBalanced: true}, // it's actually the SO_REUSEPORT. Not sure it take effect.
-			nicID); tcpiperr != nil {
-			log.Errorln("Unable to start UDP DNS on tun:  %v", tcpiperr.String())
-		}
-
-		ids[i] = id
-		endpoints[i] = endpoint
-	}
-
-	return endpoints, ids
-}
-
-func hijackTcpDns(dnsArr []net.TCPAddr, s *stack.Stack, serverIn *dns.Server) ([]net.Listener, []*dns.Server) {
-	tcpListeners := make([]net.Listener, len(dnsArr))
-	dnsServers := make([]*dns.Server, len(dnsArr))
-
-	for i, dnsAddr := range dnsArr {
-		var tcpListener net.Listener
-		var v4 bool
-		var err error
-		port := dnsAddr.Port
-		ip := dnsAddr.IP
-		address := tcpip.FullAddress{NIC: nicID, Port: uint16(port)}
-		if ip.To4() != nil {
-			address.Addr = tcpip.Address(ip.To4())
-			v4 = true
-		} else {
-			address.Addr = tcpip.Address(ip.To16())
-			v4 = false
-		}
-
-		if v4 {
-			tcpListener, err = gonet.ListenTCP(s, address, ipv4.ProtocolNumber)
-		} else {
-			tcpListener, err = gonet.ListenTCP(s, address, ipv6.ProtocolNumber)
-		}
-
-		if err != nil {
-			log.Errorln("can not listen on tun: %v, hijack tcp[%s] failed", err, dnsAddr)
-		} else {
-			tcpListeners[i] = tcpListener
-			server := &D.Server{Listener: &ListenerWrap{
-				listener: tcpListener,
-			}, Handler: serverIn}
-			dnsServer := dns.Server{}
-			dnsServer.Server = server
-			go dnsServer.ActivateAndServe()
-			dnsServers[i] = &dnsServer
-		}
-
-	}
-	//
-	//for _, listener := range tcpListeners {
-	//	server := &D.Server{Listener: listener, Handler: serverIn}
-	//
-	//	dnsServers = append(dnsServers, &dnsServer)
-	//	go dnsServer.ActivateAndServe()
-	//}
-
-	return tcpListeners, dnsServers
-}
-
-// Stop stop the DNS Server on tun
-func (s *DNSServer) Stop() {
-	if s == nil {
-		return
-	}
-
-	for i := 0; i < len(s.udpEndpointIDs); i++ {
-		ep := s.udpEndpoints[i]
-		id := s.udpEndpointIDs[i]
-		// remove udp endpoint from stack
-		s.stack.UnregisterTransportEndpoint(
-			[]tcpip.NetworkProtocolNumber{
-				ipv4.ProtocolNumber,
-				ipv6.ProtocolNumber,
-			},
-			udp.ProtocolNumber,
-			*id,
-			ep,
-			ports.Flags{LoadBalanced: true}, // should match the RegisterTransportEndpoint
-			s.NICID)
-	}
-
-	for _, server := range s.dnsServers {
-		server.Shutdown()
-	}
-
-	for _, listener := range s.tcpListeners {
-		listener.Close()
-	}
-}
-
-// DnsHijack return the listening address of DNS Server
-func (t *gvisorAdapter) DnsHijack() []string {
-	dnsHijackArr := make([]string, len(t.dnsServer.udpEndpoints))
-	for _, id := range t.dnsServer.udpEndpointIDs {
-		dnsHijackArr = append(dnsHijackArr, fmt.Sprintf("%s:%d", id.LocalAddress.String(), id.LocalPort))
-	}
-
-	return dnsHijackArr
-}
-
-func (t *gvisorAdapter) StopDNSServer() {
-	t.dnsServer.Stop()
-	log.Debugln("tun DNS server stoped")
-	t.dnsServer = nil
-}
-
-// ReCreateDNSServer recreate the DNS Server on tun
-func (t *gvisorAdapter) ReCreateDNSServer(resolver *dns.Resolver, mapper *dns.ResolverEnhancer, dnsHijackArr []string) error {
-	t.StopDNSServer()
-
-	if resolver == nil {
-		return fmt.Errorf("failed to create DNS server on tun: resolver not provided")
-	}
-
-	if len(dnsHijackArr) == 0 {
-		return fmt.Errorf("failed to create DNS server on tun: len(addrs) == 0")
-	}
-	var err error
-	var addrs []net.Addr
-	for _, addr := range dnsHijackArr {
-		var (
-			addrType string
-			hostPort string
-		)
-
-		addrType, hostPort, err = Common.SplitNetworkType(addr)
-		if err != nil {
-			return err
-		}
-
-		var (
-			host, port string
-			hasPort    bool
-		)
-
-		host, port, hasPort, err = Common.SplitHostPort(hostPort)
-		if !hasPort {
-			port = "53"
-		}
-
-		switch addrType {
-		case "udp", "":
-			{
-				var udpDNS *net.UDPAddr
-				udpDNS, err = net.ResolveUDPAddr("udp", net.JoinHostPort(host, port))
-				if err != nil {
-					return err
-				}
-
-				addrs = append(addrs, udpDNS)
-				break
-			}
-		case "tcp":
-			{
-				var tcpDNS *net.TCPAddr
-				tcpDNS, err = net.ResolveTCPAddr("tcp", net.JoinHostPort(host, port))
-				if err != nil {
-					return err
-				}
-
-				addrs = append(addrs, tcpDNS)
-				break
-			}
-		default:
-			err = fmt.Errorf("unspported dns scheme:%s", addrType)
-		}
-
-	}
-
-	server, err := CreateDNSServer(t.ipstack, resolver, mapper, addrs, nicID)
-	if err != nil {
-		return err
-	}
-
-	t.dnsServer = server
-
-	return nil
-}

listener/tun/ipstack/gvisor/udp.go

@@ -0,0 +1,67 @@
+package gvisor
+
+import (
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/gvisor/adapter"
+
+	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
+	"gvisor.dev/gvisor/pkg/waiter"
+)
+
+func withUDPHandler() Option {
+	return func(s *gvStack) error {
+		udpForwarder := udp.NewForwarder(s.Stack, func(r *udp.ForwarderRequest) {
+			var wq waiter.Queue
+			ep, err := r.CreateEndpoint(&wq)
+			if err != nil {
+				// TODO: handler errors in the future.
+				return
+			}
+
+			conn := &udpConn{
+				UDPConn: gonet.NewUDPConn(s.Stack, &wq, ep),
+				id:      r.ID(),
+			}
+			s.handler.HandleUDPConn(conn)
+		})
+		s.SetTransportProtocolHandler(udp.ProtocolNumber, udpForwarder.HandlePacket)
+		return nil
+	}
+}
+
+type udpConn struct {
+	*gonet.UDPConn
+	id stack.TransportEndpointID
+}
+
+func (c *udpConn) ID() *stack.TransportEndpointID {
+	return &c.id
+}
+
+type packet struct {
+	pc      adapter.UDPConn
+	rAddr   net.Addr
+	payload []byte
+}
+
+func (c *packet) Data() []byte {
+	return c.payload
+}
+
+// WriteBack write UDP packet with source(ip, port) = `addr`
+func (c *packet) WriteBack(b []byte, addr net.Addr) (n int, err error) {
+	return c.pc.WriteTo(b, c.rAddr)
+}
+
+// LocalAddr returns the source IP/Port of UDP Packet
+func (c *packet) LocalAddr() net.Addr {
+	return c.rAddr
+}
+
+func (c *packet) Drop() {
+	pool.Put(c.payload)
+}

listener/tun/ipstack/gvisor/utils.go

@@ -1,118 +0,0 @@
-package gvisor
-
-import (
-	"fmt"
-	"github.com/Dreamacro/clash/log"
-	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
-	"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
-	"net"
-
-	"github.com/Dreamacro/clash/component/resolver"
-	"gvisor.dev/gvisor/pkg/tcpip"
-	"gvisor.dev/gvisor/pkg/tcpip/buffer"
-	"gvisor.dev/gvisor/pkg/tcpip/header"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
-)
-
-type fakeConn struct {
-	id      stack.TransportEndpointID // The endpoint of incomming packet, it's remote address is the source address it sent from
-	pkt     *stack.PacketBuffer       // The original packet comming from tun
-	s       *stack.Stack
-	payload []byte
-	fakeip  *bool
-}
-
-func (c *fakeConn) Data() []byte {
-	return c.payload
-}
-
-func (c *fakeConn) WriteBack(b []byte, addr net.Addr) (n int, err error) {
-	v := buffer.View(b)
-	data := v.ToVectorisedView()
-
-	var localAddress tcpip.Address
-	var localPort uint16
-	// if addr is not provided, write back use original dst Addr as src Addr
-	if c.FakeIP() || addr == nil {
-		localAddress = c.id.LocalAddress
-		localPort = c.id.LocalPort
-	} else {
-		udpaddr, _ := addr.(*net.UDPAddr)
-		localAddress = tcpip.Address(udpaddr.IP)
-		localPort = uint16(udpaddr.Port)
-	}
-
-	if !c.pkt.NetworkHeader().View().IsEmpty() &&
-		(c.pkt.NetworkProtocolNumber == ipv4.ProtocolNumber ||
-			c.pkt.NetworkProtocolNumber == ipv6.ProtocolNumber) {
-		r, _ := c.s.FindRoute(c.pkt.NICID, localAddress, c.id.RemoteAddress, c.pkt.NetworkProtocolNumber, false /* multicastLoop */)
-		return writeUDP(r, data, localPort, c.id.RemotePort)
-	} else {
-		log.Debugln("the network protocl[%d] is not available", c.pkt.NetworkProtocolNumber)
-		return 0, fmt.Errorf("the network protocl[%d] is not available", c.pkt.NetworkProtocolNumber)
-	}
-}
-
-func (c *fakeConn) LocalAddr() net.Addr {
-	return &net.UDPAddr{IP: net.IP(c.id.RemoteAddress), Port: int(c.id.RemotePort)}
-}
-
-func (c *fakeConn) Close() error {
-	return nil
-}
-
-func (c *fakeConn) Drop() {
-}
-
-func (c *fakeConn) FakeIP() bool {
-	if c.fakeip != nil {
-		return *c.fakeip
-	}
-	fakeip := resolver.IsFakeIP(net.IP(c.id.LocalAddress.To4()))
-	c.fakeip = &fakeip
-	return fakeip
-}
-
-func writeUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort uint16) (int, error) {
-	const protocol = udp.ProtocolNumber
-	// Allocate a buffer for the UDP header.
-
-	pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
-		ReserveHeaderBytes: header.UDPMinimumSize + int(r.MaxHeaderLength()),
-		Data:               data,
-	})
-
-	// Initialize the header.
-	udp := header.UDP(pkt.TransportHeader().Push(header.UDPMinimumSize))
-
-	length := uint16(pkt.Size())
-	udp.Encode(&header.UDPFields{
-		SrcPort: localPort,
-		DstPort: remotePort,
-		Length:  length,
-	})
-
-	// Set the checksum field unless TX checksum offload is enabled.
-	// On IPv4, UDP checksum is optional, and a zero value indicates the
-	// transmitter skipped the checksum generation (RFC768).
-	// On IPv6, UDP checksum is not optional (RFC2460 Section 8.1).
-	if r.RequiresTXTransportChecksum() {
-		xsum := r.PseudoHeaderChecksum(protocol, length)
-		for _, v := range data.Views() {
-			xsum = header.Checksum(v, xsum)
-		}
-		udp.SetChecksum(^udp.CalculateChecksum(xsum))
-	}
-
-	ttl := r.DefaultTTL()
-
-	if err := r.WritePacket(stack.NetworkHeaderParams{Protocol: protocol, TTL: ttl, TOS: 0 /* default */}, pkt); err != nil {
-		r.Stats().UDP.PacketSendErrors.Increment()
-		return 0, fmt.Errorf("%v", err)
-	}
-
-	// Track count of packets sent.
-	r.Stats().UDP.PacketsSent.Increment()
-	return data.Size(), nil
-}

listener/tun/ipstack/stack.go

@@ -0,0 +1,5 @@
+package ipstack
+
+import "io"
+
+type Stack io.Closer

listener/tun/ipstack/stack_adapter.go

@@ -1,9 +0,0 @@
-package ipstack
-
-// TunAdapter hold the state of tun/tap interface
-type TunAdapter interface {
-	Close()
-	Stack() string
-	DnsHijack() []string
-	AutoRoute() bool
-}

listener/tun/ipstack/system/dns.go

@@ -1,75 +0,0 @@
-package system
-
-import (
-	"encoding/binary"
-	"io"
-	"net"
-	"time"
-
-	D "github.com/Dreamacro/clash/listener/tun/ipstack/commons"
-	"github.com/kr328/tun2socket/binding"
-	"github.com/kr328/tun2socket/redirect"
-)
-
-const defaultDnsReadTimeout = time.Second * 30
-
-func shouldHijackDns(dnsAddr binding.Address, targetAddr binding.Address) bool {
-	if targetAddr.Port != 53 {
-		return false
-	}
-
-	return dnsAddr.IP.Equal(net.IPv4zero) || dnsAddr.IP.Equal(targetAddr.IP)
-}
-
-func hijackUDPDns(pkt []byte, ep *binding.Endpoint, sender redirect.UDPSender) {
-	go func() {
-		answer, err := D.RelayDnsPacket(pkt)
-		if err != nil {
-			return
-		}
-
-		_ = sender(answer, &binding.Endpoint{
-			Source: ep.Target,
-			Target: ep.Source,
-		})
-	}()
-}
-
-func hijackTCPDns(conn net.Conn) {
-	go func() {
-		defer func(conn net.Conn) {
-			_ = conn.Close()
-		}(conn)
-
-		if err := conn.SetReadDeadline(time.Now().Add(defaultDnsReadTimeout)); err != nil {
-			return
-		}
-
-		for {
-			var length uint16
-			if binary.Read(conn, binary.BigEndian, &length) != nil {
-				return
-			}
-
-			data := make([]byte, length)
-
-			_, err := io.ReadFull(conn, data)
-			if err != nil {
-				return
-			}
-
-			rb, err := D.RelayDnsPacket(data)
-			if err != nil {
-				continue
-			}
-
-			if binary.Write(conn, binary.BigEndian, uint16(len(rb))) != nil {
-				return
-			}
-
-			if _, err = conn.Write(rb); err != nil {
-				return
-			}
-		}
-	}()
-}

listener/tun/ipstack/system/log.go

@@ -1,21 +0,0 @@
-package system
-
-import "github.com/Dreamacro/clash/log"
-
-type logger struct{}
-
-func (l *logger) D(format string, args ...interface{}) {
-	log.Debugln("[TUN] "+format, args...)
-}
-
-func (l *logger) I(format string, args ...interface{}) {
-	log.Infoln("[TUN] "+format, args...)
-}
-
-func (l *logger) W(format string, args ...interface{}) {
-	log.Warnln("[TUN] "+format, args...)
-}
-
-func (l *logger) E(format string, args ...interface{}) {
-	log.Errorln("[TUN] "+format, args...)
-}

listener/tun/ipstack/system/mars/mars.go

@@ -0,0 +1,42 @@
+package mars
+
+import (
+	"io"
+	"net/netip"
+
+	"github.com/Dreamacro/clash/listener/tun/ipstack/system/mars/nat"
+)
+
+type StackListener struct {
+	device io.Closer
+	tcp    *nat.TCP
+	udp    *nat.UDP
+}
+
+func StartListener(device io.ReadWriteCloser, gateway netip.Addr, portal netip.Addr) (*StackListener, error) {
+	tcp, udp, err := nat.Start(device, gateway, portal)
+	if err != nil {
+		return nil, err
+	}
+
+	return &StackListener{
+		device: device,
+		tcp:    tcp,
+		udp:    udp,
+	}, nil
+}
+
+func (t *StackListener) Close() error {
+	_ = t.tcp.Close()
+	_ = t.udp.Close()
+
+	return t.device.Close()
+}
+
+func (t *StackListener) TCP() *nat.TCP {
+	return t.tcp
+}
+
+func (t *StackListener) UDP() *nat.UDP {
+	return t.udp
+}

listener/tun/ipstack/system/mars/nat/nat.go

@@ -0,0 +1,193 @@
+package nat
+
+import (
+	"io"
+	"net"
+	"net/netip"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/system/mars/tcpip"
+)
+
+func Start(
+	device io.ReadWriter,
+	gateway netip.Addr,
+	portal netip.Addr,
+) (*TCP, *UDP, error) {
+	if !portal.Is4() || !gateway.Is4() {
+		return nil, nil, net.InvalidAddrError("only ipv4 supported")
+	}
+
+	listener, err := net.ListenTCP("tcp4", nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	tab := newTable()
+	udp := &UDP{
+		device: device,
+		buf:    [pool.UDPBufferSize]byte{},
+	}
+	tcp := &TCP{
+		listener: listener,
+		portal:   portal,
+		table:    tab,
+	}
+
+	gatewayPort := uint16(listener.Addr().(*net.TCPAddr).Port)
+
+	go func() {
+		defer tcp.Close()
+		defer udp.Close()
+
+		buf := make([]byte, pool.RelayBufferSize)
+
+		for {
+			n, err := device.Read(buf)
+			if err != nil {
+				return
+			}
+
+			raw := buf[:n]
+
+			var (
+				ipVersion int
+				ip        tcpip.IP
+			)
+
+			ipVersion = tcpip.IPVersion(raw)
+
+			switch ipVersion {
+			case tcpip.IPv4Version:
+				ipv4 := tcpip.IPv4Packet(raw)
+				if !ipv4.Valid() {
+					continue
+				}
+
+				if ipv4.TimeToLive() == 0x00 {
+					continue
+				}
+
+				if ipv4.Flags()&tcpip.FlagMoreFragment != 0 {
+					continue
+				}
+
+				if ipv4.Offset() != 0 {
+					continue
+				}
+
+				ip = ipv4
+			case tcpip.IPv6Version:
+				ipv6 := tcpip.IPv6Packet(raw)
+				if !ipv6.Valid() {
+					continue
+				}
+
+				if ipv6.HopLimit() == 0x00 {
+					continue
+				}
+
+				ip = ipv6
+			default:
+				continue
+			}
+
+			switch ip.Protocol() {
+			case tcpip.TCP:
+				t := tcpip.TCPPacket(ip.Payload())
+				if !t.Valid() {
+					continue
+				}
+
+				if ip.DestinationIP() == portal {
+					if ip.SourceIP() == gateway && t.SourcePort() == gatewayPort {
+						tup := tab.tupleOf(t.DestinationPort())
+						if tup == zeroTuple {
+							continue
+						}
+
+						ip.SetSourceIP(tup.DestinationAddr.Addr())
+						t.SetSourcePort(tup.DestinationAddr.Port())
+						ip.SetDestinationIP(tup.SourceAddr.Addr())
+						t.SetDestinationPort(tup.SourceAddr.Port())
+
+						ip.DecTimeToLive()
+						ip.ResetChecksum()
+						t.ResetChecksum(ip.PseudoSum())
+
+						_, _ = device.Write(raw)
+					}
+				} else {
+					tup := tuple{
+						SourceAddr:      netip.AddrPortFrom(ip.SourceIP(), t.SourcePort()),
+						DestinationAddr: netip.AddrPortFrom(ip.DestinationIP(), t.DestinationPort()),
+					}
+
+					port := tab.portOf(tup)
+					if port == 0 {
+						if t.Flags() != tcpip.TCPSyn {
+							continue
+						}
+
+						port = tab.newConn(tup)
+					}
+
+					ip.SetSourceIP(portal)
+					ip.SetDestinationIP(gateway)
+					t.SetSourcePort(port)
+					t.SetDestinationPort(gatewayPort)
+
+					ip.ResetChecksum()
+					t.ResetChecksum(ip.PseudoSum())
+
+					_, _ = device.Write(raw)
+				}
+			case tcpip.UDP:
+				u := tcpip.UDPPacket(ip.Payload())
+				if !u.Valid() {
+					continue
+				}
+
+				udp.handleUDPPacket(ip, u)
+			case tcpip.ICMP:
+				i := tcpip.ICMPPacket(ip.Payload())
+
+				if i.Type() != tcpip.ICMPTypePingRequest || i.Code() != 0 {
+					continue
+				}
+
+				i.SetType(tcpip.ICMPTypePingResponse)
+
+				source := ip.SourceIP()
+				destination := ip.DestinationIP()
+				ip.SetSourceIP(destination)
+				ip.SetDestinationIP(source)
+
+				ip.ResetChecksum()
+				i.ResetChecksum()
+
+				_, _ = device.Write(raw)
+			case tcpip.ICMPv6:
+				i := tcpip.ICMPv6Packet(ip.Payload())
+
+				if i.Type() != tcpip.ICMPv6EchoRequest || i.Code() != 0 {
+					continue
+				}
+
+				i.SetType(tcpip.ICMPv6EchoReply)
+
+				source := ip.SourceIP()
+				destination := ip.DestinationIP()
+				ip.SetSourceIP(destination)
+				ip.SetDestinationIP(source)
+
+				ip.ResetChecksum()
+				i.ResetChecksum(ip.PseudoSum())
+
+				_, _ = device.Write(raw)
+			}
+		}
+	}()
+
+	return tcp, udp, nil
+}

listener/tun/ipstack/system/mars/nat/table.go

@@ -0,0 +1,83 @@
+package nat
+
+import (
+	"container/list"
+	"net/netip"
+)
+
+const (
+	portBegin  = 30000
+	portLength = 4096
+)
+
+var zeroTuple = tuple{}
+
+type tuple struct {
+	SourceAddr      netip.AddrPort
+	DestinationAddr netip.AddrPort
+}
+
+type binding struct {
+	tuple  tuple
+	offset uint16
+}
+
+type table struct {
+	tuples    map[tuple]*list.Element
+	ports     [portLength]*list.Element
+	available *list.List
+}
+
+func (t *table) tupleOf(port uint16) tuple {
+	offset := port - portBegin
+	if offset > portLength {
+		return zeroTuple
+	}
+
+	elm := t.ports[offset]
+
+	t.available.MoveToFront(elm)
+
+	return elm.Value.(*binding).tuple
+}
+
+func (t *table) portOf(tuple tuple) uint16 {
+	elm := t.tuples[tuple]
+	if elm == nil {
+		return 0
+	}
+
+	t.available.MoveToFront(elm)
+
+	return portBegin + elm.Value.(*binding).offset
+}
+
+func (t *table) newConn(tuple tuple) uint16 {
+	elm := t.available.Back()
+	b := elm.Value.(*binding)
+
+	delete(t.tuples, b.tuple)
+	t.tuples[tuple] = elm
+	b.tuple = tuple
+
+	t.available.MoveToFront(elm)
+
+	return portBegin + b.offset
+}
+
+func newTable() *table {
+	result := &table{
+		tuples:    make(map[tuple]*list.Element, portLength),
+		ports:     [portLength]*list.Element{},
+		available: list.New(),
+	}
+
+	for idx := range result.ports {
+		result.ports[idx] = result.available.PushFront(&binding{
+			tuple:  tuple{},
+			offset: uint16(idx),
+		})
+	}
+
+	return result
+}

listener/tun/ipstack/system/mars/nat/tcp.go

@@ -0,0 +1,67 @@
+package nat
+
+import (
+	"net"
+	"net/netip"
+	"time"
+)
+
+type TCP struct {
+	listener *net.TCPListener
+	portal   netip.Addr
+	table    *table
+}
+
+type conn struct {
+	net.Conn
+
+	tuple tuple
+}
+
+func (t *TCP) Accept() (net.Conn, error) {
+	c, err := t.listener.AcceptTCP()
+	if err != nil {
+		return nil, err
+	}
+
+	addr := c.RemoteAddr().(*net.TCPAddr)
+	tup := t.table.tupleOf(uint16(addr.Port))
+	if !addr.IP.Equal(t.portal.AsSlice()) || tup == zeroTuple {
+		_ = c.Close()
+
+		return nil, net.InvalidAddrError("unknown remote addr")
+	}
+
+	addition(c)
+
+	return &conn{
+		Conn:  c,
+		tuple: tup,
+	}, nil
+}
+
+func (t *TCP) Close() error {
+	return t.listener.Close()
+}
+
+func (t *TCP) Addr() net.Addr {
+	return t.listener.Addr()
+}
+
+func (t *TCP) SetDeadline(time time.Time) error {
+	return t.listener.SetDeadline(time)
+}
+
+func (c *conn) LocalAddr() net.Addr {
+	return &net.TCPAddr{
+		IP:   c.tuple.SourceAddr.Addr().AsSlice(),
+		Port: int(c.tuple.SourceAddr.Port()),
+	}
+}
+
+func (c *conn) RemoteAddr() net.Addr {
+	return &net.TCPAddr{
+		IP:   c.tuple.DestinationAddr.Addr().AsSlice(),
+		Port: int(c.tuple.DestinationAddr.Port()),
+	}
+}

listener/tun/ipstack/system/mars/nat/tcp_linux.go

@@ -0,0 +1,15 @@
+package nat
+
+import (
+	"net"
+	"syscall"
+)
+
+func addition(c *net.TCPConn) {
+	sys, err := c.SyscallConn()
+	if err == nil {
+		_ = sys.Control(func(fd uintptr) {
+			_ = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_NO_CHECK, 1)
+		})
+	}
+}

listener/tun/ipstack/system/mars/nat/tcp_others.go

@@ -0,0 +1,7 @@
+//go:build !linux
+
+package nat
+
+import "net"
+
+func addition(*net.TCPConn) {}

listener/tun/ipstack/system/mars/nat/udp.go

@@ -0,0 +1,147 @@
+package nat
+
+import (
+	"io"
+	"math/rand"
+	"net"
+	"net/netip"
+	"sync"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/system/mars/tcpip"
+)
+
+type call struct {
+	cond        *sync.Cond
+	buf         []byte
+	n           int
+	source      net.Addr
+	destination net.Addr
+}
+
+type UDP struct {
+	closed    bool
+	device    io.Writer
+	queueLock sync.Mutex
+	queue     []*call
+	bufLock   sync.Mutex
+	buf       [pool.UDPBufferSize]byte
+}
+
+func (u *UDP) ReadFrom(buf []byte) (int, net.Addr, net.Addr, error) {
+	u.queueLock.Lock()
+	defer u.queueLock.Unlock()
+
+	for !u.closed {
+		c := &call{
+			cond:        sync.NewCond(&u.queueLock),
+			buf:         buf,
+			n:           -1,
+			source:      nil,
+			destination: nil,
+		}
+
+		u.queue = append(u.queue, c)
+
+		c.cond.Wait()
+
+		if c.n >= 0 {
+			return c.n, c.source, c.destination, nil
+		}
+	}
+
+	return -1, nil, nil, net.ErrClosed
+}
+
+func (u *UDP) WriteTo(buf []byte, local net.Addr, remote net.Addr) (int, error) {
+	if u.closed {
+		return 0, net.ErrClosed
+	}
+
+	u.bufLock.Lock()
+	defer u.bufLock.Unlock()
+
+	if len(buf) > 0xffff {
+		return 0, net.InvalidAddrError("invalid ip version")
+	}
+
+	srcAddr, srcOk := local.(*net.UDPAddr)
+	dstAddr, dstOk := remote.(*net.UDPAddr)
+	if !srcOk || !dstOk {
+		return 0, net.InvalidAddrError("invalid addr")
+	}
+
+	srcIP, _ := netip.AddrFromSlice(srcAddr.IP)
+	dstIp, _ := netip.AddrFromSlice(dstAddr.IP)
+
+	srcAddrPort := netip.AddrPortFrom(srcIP, uint16(srcAddr.Port))
+	dstAddrPort := netip.AddrPortFrom(dstIp, uint16(dstAddr.Port))
+
+	if !srcAddrPort.Addr().Is4() || !dstAddrPort.Addr().Is4() {
+		return 0, net.InvalidAddrError("invalid ip version")
+	}
+
+	tcpip.SetIPv4(u.buf[:])
+
+	ip := tcpip.IPv4Packet(u.buf[:])
+	ip.SetHeaderLen(tcpip.IPv4HeaderSize)
+	ip.SetTotalLength(tcpip.IPv4HeaderSize + tcpip.UDPHeaderSize + uint16(len(buf)))
+	ip.SetTypeOfService(0)
+	ip.SetIdentification(uint16(rand.Uint32()))
+	ip.SetFragmentOffset(0)
+	ip.SetTimeToLive(64)
+	ip.SetProtocol(tcpip.UDP)
+	ip.SetSourceIP(srcAddrPort.Addr())
+	ip.SetDestinationIP(dstAddrPort.Addr())
+
+	udp := tcpip.UDPPacket(ip.Payload())
+	udp.SetLength(tcpip.UDPHeaderSize + uint16(len(buf)))
+	udp.SetSourcePort(srcAddrPort.Port())
+	udp.SetDestinationPort(dstAddrPort.Port())
+	copy(udp.Payload(), buf)
+
+	ip.ResetChecksum()
+	udp.ResetChecksum(ip.PseudoSum())
+
+	return u.device.Write(u.buf[:ip.TotalLen()])
+}
+
+func (u *UDP) Close() error {
+	u.queueLock.Lock()
+	defer u.queueLock.Unlock()
+
+	u.closed = true
+
+	for _, c := range u.queue {
+		c.cond.Signal()
+	}
+
+	return nil
+}
+
+func (u *UDP) handleUDPPacket(ip tcpip.IP, pkt tcpip.UDPPacket) {
+	var c *call
+
+	u.queueLock.Lock()
+
+	if len(u.queue) > 0 {
+		idx := len(u.queue) - 1
+		c = u.queue[idx]
+		u.queue = u.queue[:idx]
+	}
+
+	u.queueLock.Unlock()
+
+	if c != nil {
+		c.source = &net.UDPAddr{
+			IP:   ip.SourceIP().AsSlice(),
+			Port: int(pkt.SourcePort()),
+		}
+		c.destination = &net.UDPAddr{
+			IP:   ip.DestinationIP().AsSlice(),
+			Port: int(pkt.DestinationPort()),
+		}
+		c.n = copy(c.buf, pkt.Payload())
+		c.cond.Signal()
+	}
+}

listener/tun/ipstack/system/mars/tcpip/icmp.go

@@ -0,0 +1,40 @@
+package tcpip
+
+import (
+	"encoding/binary"
+)
+
+type ICMPType = byte
+
+const (
+	ICMPTypePingRequest  byte = 0x8
+	ICMPTypePingResponse byte = 0x0
+)
+
+type ICMPPacket []byte
+
+func (p ICMPPacket) Type() ICMPType {
+	return p[0]
+}
+
+func (p ICMPPacket) SetType(v ICMPType) {
+	p[0] = v
+}
+
+func (p ICMPPacket) Code() byte {
+	return p[1]
+}
+
+func (p ICMPPacket) Checksum() uint16 {
+	return binary.BigEndian.Uint16(p[2:])
+}
+
+func (p ICMPPacket) SetChecksum(sum [2]byte) {
+	p[2] = sum[0]
+	p[3] = sum[1]
+}
+
+func (p ICMPPacket) ResetChecksum() {
+	p.SetChecksum(zeroChecksum)
+	p.SetChecksum(Checksum(0, p))
+}

listener/tun/ipstack/system/mars/tcpip/icmpv6.go

@@ -0,0 +1,172 @@
+package tcpip
+
+import (
+	"encoding/binary"
+)
+
+type ICMPv6Packet []byte
+
+const (
+	ICMPv6HeaderSize = 4
+
+	ICMPv6MinimumSize = 8
+
+	ICMPv6PayloadOffset = 8
+
+	ICMPv6EchoMinimumSize = 8
+
+	ICMPv6ErrorHeaderSize = 8
+
+	ICMPv6DstUnreachableMinimumSize = ICMPv6MinimumSize
+
+	ICMPv6PacketTooBigMinimumSize = ICMPv6MinimumSize
+
+	ICMPv6ChecksumOffset = 2
+
+	icmpv6PointerOffset = 4
+
+	icmpv6MTUOffset = 4
+
+	icmpv6IdentOffset = 4
+
+	icmpv6SequenceOffset = 6
+
+	NDPHopLimit = 255
+)
+
+type ICMPv6Type byte
+
+const (
+	ICMPv6DstUnreachable ICMPv6Type = 1
+	ICMPv6PacketTooBig   ICMPv6Type = 2
+	ICMPv6TimeExceeded   ICMPv6Type = 3
+	ICMPv6ParamProblem   ICMPv6Type = 4
+	ICMPv6EchoRequest    ICMPv6Type = 128
+	ICMPv6EchoReply      ICMPv6Type = 129
+
+	ICMPv6RouterSolicit   ICMPv6Type = 133
+	ICMPv6RouterAdvert    ICMPv6Type = 134
+	ICMPv6NeighborSolicit ICMPv6Type = 135
+	ICMPv6NeighborAdvert  ICMPv6Type = 136
+	ICMPv6RedirectMsg     ICMPv6Type = 137
+
+	ICMPv6MulticastListenerQuery  ICMPv6Type = 130
+	ICMPv6MulticastListenerReport ICMPv6Type = 131
+	ICMPv6MulticastListenerDone   ICMPv6Type = 132
+)
+
+func (typ ICMPv6Type) IsErrorType() bool {
+	return typ&0x80 == 0
+}
+
+type ICMPv6Code byte
+
+const (
+	ICMPv6NetworkUnreachable ICMPv6Code = 0
+	ICMPv6Prohibited         ICMPv6Code = 1
+	ICMPv6BeyondScope        ICMPv6Code = 2
+	ICMPv6AddressUnreachable ICMPv6Code = 3
+	ICMPv6PortUnreachable    ICMPv6Code = 4
+	ICMPv6Policy             ICMPv6Code = 5
+	ICMPv6RejectRoute        ICMPv6Code = 6
+)
+
+const (
+	ICMPv6HopLimitExceeded  ICMPv6Code = 0
+	ICMPv6ReassemblyTimeout ICMPv6Code = 1
+)
+
+const (
+	ICMPv6ErroneousHeader ICMPv6Code = 0
+
+	ICMPv6UnknownHeader ICMPv6Code = 1
+
+	ICMPv6UnknownOption ICMPv6Code = 2
+)
+
+const ICMPv6UnusedCode ICMPv6Code = 0
+
+func (b ICMPv6Packet) Type() ICMPv6Type {
+	return ICMPv6Type(b[0])
+}
+
+func (b ICMPv6Packet) SetType(t ICMPv6Type) {
+	b[0] = byte(t)
+}
+
+func (b ICMPv6Packet) Code() ICMPv6Code {
+	return ICMPv6Code(b[1])
+}
+
+func (b ICMPv6Packet) SetCode(c ICMPv6Code) {
+	b[1] = byte(c)
+}
+
+func (b ICMPv6Packet) TypeSpecific() uint32 {
+	return binary.BigEndian.Uint32(b[icmpv6PointerOffset:])
+}
+
+func (b ICMPv6Packet) SetTypeSpecific(val uint32) {
+	binary.BigEndian.PutUint32(b[icmpv6PointerOffset:], val)
+}
+
+func (b ICMPv6Packet) Checksum() uint16 {
+	return binary.BigEndian.Uint16(b[ICMPv6ChecksumOffset:])
+}
+
+func (b ICMPv6Packet) SetChecksum(sum [2]byte) {
+	_ = b[ICMPv6ChecksumOffset+1]
+	b[ICMPv6ChecksumOffset] = sum[0]
+	b[ICMPv6ChecksumOffset+1] = sum[1]
+}
+
+func (ICMPv6Packet) SourcePort() uint16 {
+	return 0
+}
+
+func (ICMPv6Packet) DestinationPort() uint16 {
+	return 0
+}
+
+func (ICMPv6Packet) SetSourcePort(uint16) {
+}
+
+func (ICMPv6Packet) SetDestinationPort(uint16) {
+}
+
+func (b ICMPv6Packet) MTU() uint32 {
+	return binary.BigEndian.Uint32(b[icmpv6MTUOffset:])
+}
+
+func (b ICMPv6Packet) SetMTU(mtu uint32) {
+	binary.BigEndian.PutUint32(b[icmpv6MTUOffset:], mtu)
+}
+
+func (b ICMPv6Packet) Ident() uint16 {
+	return binary.BigEndian.Uint16(b[icmpv6IdentOffset:])
+}
+
+func (b ICMPv6Packet) SetIdent(ident uint16) {
+	binary.BigEndian.PutUint16(b[icmpv6IdentOffset:], ident)
+}
+
+func (b ICMPv6Packet) Sequence() uint16 {
+	return binary.BigEndian.Uint16(b[icmpv6SequenceOffset:])
+}
+
+func (b ICMPv6Packet) SetSequence(sequence uint16) {
+	binary.BigEndian.PutUint16(b[icmpv6SequenceOffset:], sequence)
+}
+
+func (b ICMPv6Packet) MessageBody() []byte {
+	return b[ICMPv6HeaderSize:]
+}
+
+func (b ICMPv6Packet) Payload() []byte {
+	return b[ICMPv6PayloadOffset:]
+}
+
+func (b ICMPv6Packet) ResetChecksum(psum uint32) {
+	b.SetChecksum(zeroChecksum)
+	b.SetChecksum(Checksum(psum, b))
+}

listener/tun/ipstack/system/mars/tcpip/ip.go

@@ -0,0 +1,215 @@
+package tcpip
+
+import (
+	"encoding/binary"
+	"errors"
+	"net/netip"
+)
+
+type IPProtocol = byte
+
+type IP interface {
+	Payload() []byte
+	SourceIP() netip.Addr
+	DestinationIP() netip.Addr
+	SetSourceIP(ip netip.Addr)
+	SetDestinationIP(ip netip.Addr)
+	Protocol() IPProtocol
+	DecTimeToLive()
+	ResetChecksum()
+	PseudoSum() uint32
+}
+
+// IPProtocol type
+const (
+	ICMP   IPProtocol = 0x01
+	TCP    IPProtocol = 0x06
+	UDP    IPProtocol = 0x11
+	ICMPv6 IPProtocol = 0x3a
+)
+
+const (
+	FlagDontFragment = 1 << 1
+	FlagMoreFragment = 1 << 2
+)
+
+const (
+	IPv4HeaderSize = 20
+
+	IPv4Version = 4
+
+	IPv4OptionsOffset   = 20
+	IPv4PacketMinLength = IPv4OptionsOffset
+)
+
+var (
+	ErrInvalidLength    = errors.New("invalid packet length")
+	ErrInvalidIPVersion = errors.New("invalid ip version")
+	ErrInvalidChecksum  = errors.New("invalid checksum")
+)
+
+type IPv4Packet []byte
+
+func (p IPv4Packet) TotalLen() uint16 {
+	return binary.BigEndian.Uint16(p[2:])
+}
+
+func (p IPv4Packet) SetTotalLength(length uint16) {
+	binary.BigEndian.PutUint16(p[2:], length)
+}
+
+func (p IPv4Packet) HeaderLen() uint16 {
+	return uint16(p[0]&0xf) * 4
+}
+
+func (p IPv4Packet) SetHeaderLen(length uint16) {
+	p[0] &= 0xF0
+	p[0] |= byte(length / 4)
+}
+
+func (p IPv4Packet) TypeOfService() byte {
+	return p[1]
+}
+
+func (p IPv4Packet) SetTypeOfService(tos byte) {
+	p[1] = tos
+}
+
+func (p IPv4Packet) Identification() uint16 {
+	return binary.BigEndian.Uint16(p[4:])
+}
+
+func (p IPv4Packet) SetIdentification(id uint16) {
+	binary.BigEndian.PutUint16(p[4:], id)
+}
+
+func (p IPv4Packet) FragmentOffset() uint16 {
+	return binary.BigEndian.Uint16([]byte{p[6] & 0x7, p[7]}) * 8
+}
+
+func (p IPv4Packet) SetFragmentOffset(offset uint32) {
+	flags := p.Flags()
+	binary.BigEndian.PutUint16(p[6:], uint16(offset/8))
+	p.SetFlags(flags)
+}
+
+func (p IPv4Packet) DataLen() uint16 {
+	return p.TotalLen() - p.HeaderLen()
+}
+
+func (p IPv4Packet) Payload() []byte {
+	return p[p.HeaderLen():p.TotalLen()]
+}
+
+func (p IPv4Packet) Protocol() IPProtocol {
+	return p[9]
+}
+
+func (p IPv4Packet) SetProtocol(protocol IPProtocol) {
+	p[9] = protocol
+}
+
+func (p IPv4Packet) Flags() byte {
+	return p[6] >> 5
+}
+
+func (p IPv4Packet) SetFlags(flags byte) {
+	p[6] &= 0x1F
+	p[6] |= flags << 5
+}
+
+func (p IPv4Packet) Offset() uint16 {
+	offset := binary.BigEndian.Uint16(p[6:8])
+
+	return (offset & 0x1fff) * 8
+}
+
+func (p IPv4Packet) SourceIP() netip.Addr {
+	return netip.AddrFrom4([4]byte{p[12], p[13], p[14], p[15]})
+}
+
+func (p IPv4Packet) SetSourceIP(ip netip.Addr) {
+	if ip.Is4() {
+		copy(p[12:16], ip.AsSlice())
+	}
+}
+
+func (p IPv4Packet) DestinationIP() netip.Addr {
+	return netip.AddrFrom4([4]byte{p[16], p[17], p[18], p[19]})
+}
+
+func (p IPv4Packet) SetDestinationIP(ip netip.Addr) {
+	if ip.Is4() {
+		copy(p[16:20], ip.AsSlice())
+	}
+}
+
+func (p IPv4Packet) Checksum() uint16 {
+	return binary.BigEndian.Uint16(p[10:])
+}
+
+func (p IPv4Packet) SetChecksum(sum [2]byte) {
+	p[10] = sum[0]
+	p[11] = sum[1]
+}
+
+func (p IPv4Packet) TimeToLive() uint8 {
+	return p[8]
+}
+
+func (p IPv4Packet) SetTimeToLive(ttl uint8) {
+	p[8] = ttl
+}
+
+func (p IPv4Packet) DecTimeToLive() {
+	p[8] = p[8] - uint8(1)
+}
+
+func (p IPv4Packet) ResetChecksum() {
+	p.SetChecksum(zeroChecksum)
+	p.SetChecksum(Checksum(0, p[:p.HeaderLen()]))
+}
+
+// PseudoSum for tcp checksum
+func (p IPv4Packet) PseudoSum() uint32 {
+	sum := Sum(p[12:20])
+	sum += uint32(p.Protocol())
+	sum += uint32(p.DataLen())
+	return sum
+}
+
+func (p IPv4Packet) Valid() bool {
+	return len(p) >= IPv4HeaderSize && uint16(len(p)) >= p.TotalLen()
+}
+
+func (p IPv4Packet) Verify() error {
+	if len(p) < IPv4PacketMinLength {
+		return ErrInvalidLength
+	}
+
+	checksum := []byte{p[10], p[11]}
+	headerLength := uint16(p[0]&0xF) * 4
+	packetLength := binary.BigEndian.Uint16(p[2:])
+
+	if p[0]>>4 != 4 {
+		return ErrInvalidIPVersion
+	}
+
+	if uint16(len(p)) < packetLength || packetLength < headerLength {
+		return ErrInvalidLength
+	}
+
+	p[10] = 0
+	p[11] = 0
+	defer copy(p[10:12], checksum)
+
+	answer := Checksum(0, p[:headerLength])
+
+	if answer[0] != checksum[0] || answer[1] != checksum[1] {
+		return ErrInvalidChecksum
+	}
+
+	return nil
+}
+
+var _ IP = (*IPv4Packet)(nil)

listener/tun/ipstack/system/mars/tcpip/ipv6.go

@@ -0,0 +1,141 @@
+package tcpip
+
+import (
+	"encoding/binary"
+	"net/netip"
+)
+
+const (
+	versTCFL = 0
+
+	IPv6PayloadLenOffset = 4
+
+	IPv6NextHeaderOffset = 6
+	hopLimit             = 7
+	v6SrcAddr            = 8
+	v6DstAddr            = v6SrcAddr + IPv6AddressSize
+
+	IPv6FixedHeaderSize = v6DstAddr + IPv6AddressSize
+)
+
+const (
+	versIHL        = 0
+	tos            = 1
+	ipVersionShift = 4
+	ipIHLMask      = 0x0f
+	IPv4IHLStride  = 4
+)
+
+type IPv6Packet []byte
+
+const (
+	IPv6MinimumSize = IPv6FixedHeaderSize
+
+	IPv6AddressSize = 16
+
+	IPv6Version = 6
+
+	IPv6MinimumMTU = 1280
+)
+
+func (b IPv6Packet) PayloadLength() uint16 {
+	return binary.BigEndian.Uint16(b[IPv6PayloadLenOffset:])
+}
+
+func (b IPv6Packet) HopLimit() uint8 {
+	return b[hopLimit]
+}
+
+func (b IPv6Packet) NextHeader() byte {
+	return b[IPv6NextHeaderOffset]
+}
+
+func (b IPv6Packet) Protocol() IPProtocol {
+	return b.NextHeader()
+}
+
+func (b IPv6Packet) Payload() []byte {
+	return b[IPv6MinimumSize:][:b.PayloadLength()]
+}
+
+func (b IPv6Packet) SourceIP() netip.Addr {
+	addr, _ := netip.AddrFromSlice(b[v6SrcAddr:][:IPv6AddressSize])
+	return addr
+}
+
+func (b IPv6Packet) DestinationIP() netip.Addr {
+	addr, _ := netip.AddrFromSlice(b[v6DstAddr:][:IPv6AddressSize])
+	return addr
+}
+
+func (IPv6Packet) Checksum() uint16 {
+	return 0
+}
+
+func (b IPv6Packet) TOS() (uint8, uint32) {
+	v := binary.BigEndian.Uint32(b[versTCFL:])
+	return uint8(v >> 20), v & 0xfffff
+}
+
+func (b IPv6Packet) SetTOS(t uint8, l uint32) {
+	vtf := (6 << 28) | (uint32(t) << 20) | (l & 0xfffff)
+	binary.BigEndian.PutUint32(b[versTCFL:], vtf)
+}
+
+func (b IPv6Packet) SetPayloadLength(payloadLength uint16) {
+	binary.BigEndian.PutUint16(b[IPv6PayloadLenOffset:], payloadLength)
+}
+
+func (b IPv6Packet) SetSourceIP(addr netip.Addr) {
+	if addr.Is6() {
+		copy(b[v6SrcAddr:][:IPv6AddressSize], addr.AsSlice())
+	}
+}
+
+func (b IPv6Packet) SetDestinationIP(addr netip.Addr) {
+	if addr.Is6() {
+		copy(b[v6DstAddr:][:IPv6AddressSize], addr.AsSlice())
+	}
+}
+
+func (b IPv6Packet) SetHopLimit(v uint8) {
+	b[hopLimit] = v
+}
+
+func (b IPv6Packet) SetNextHeader(v byte) {
+	b[IPv6NextHeaderOffset] = v
+}
+
+func (b IPv6Packet) SetProtocol(p IPProtocol) {
+	b.SetNextHeader(p)
+}
+
+func (b IPv6Packet) DecTimeToLive() {
+	b[hopLimit] = b[hopLimit] - uint8(1)
+}
+
+func (IPv6Packet) SetChecksum(uint16) {
+}
+
+func (IPv6Packet) ResetChecksum() {
+}
+
+func (b IPv6Packet) PseudoSum() uint32 {
+	sum := Sum(b[v6SrcAddr:IPv6FixedHeaderSize])
+	sum += uint32(b.Protocol())
+	sum += uint32(b.PayloadLength())
+	return sum
+}
+
+func (b IPv6Packet) Valid() bool {
+	return len(b) >= IPv6MinimumSize && len(b) >= int(b.PayloadLength())+IPv6MinimumSize
+}
+
+func IPVersion(b []byte) int {
+	if len(b) < versIHL+1 {
+		return -1
+	}
+	return int(b[versIHL] >> ipVersionShift)
+}
+
+var _ IP = (*IPv6Packet)(nil)

listener/tun/ipstack/system/mars/tcpip/tcp.go

@@ -0,0 +1,90 @@
+package tcpip
+
+import (
+	"encoding/binary"
+	"net"
+)
+
+const (
+	TCPFin uint16 = 1 << 0
+	TCPSyn uint16 = 1 << 1
+	TCPRst uint16 = 1 << 2
+	TCPPuh uint16 = 1 << 3
+	TCPAck uint16 = 1 << 4
+	TCPUrg uint16 = 1 << 5
+	TCPEce uint16 = 1 << 6
+	TCPEwr uint16 = 1 << 7
+	TCPNs  uint16 = 1 << 8
+)
+
+const TCPHeaderSize = 20
+
+type TCPPacket []byte
+
+func (p TCPPacket) SourcePort() uint16 {
+	return binary.BigEndian.Uint16(p)
+}
+
+func (p TCPPacket) SetSourcePort(port uint16) {
+	binary.BigEndian.PutUint16(p, port)
+}
+
+func (p TCPPacket) DestinationPort() uint16 {
+	return binary.BigEndian.Uint16(p[2:])
+}
+
+func (p TCPPacket) SetDestinationPort(port uint16) {
+	binary.BigEndian.PutUint16(p[2:], port)
+}
+
+func (p TCPPacket) Flags() uint16 {
+	return uint16(p[13] | (p[12] & 0x1))
+}
+
+func (p TCPPacket) Checksum() uint16 {
+	return binary.BigEndian.Uint16(p[16:])
+}
+
+func (p TCPPacket) SetChecksum(sum [2]byte) {
+	p[16] = sum[0]
+	p[17] = sum[1]
+}
+
+func (p TCPPacket) ResetChecksum(psum uint32) {
+	p.SetChecksum(zeroChecksum)
+	p.SetChecksum(Checksum(psum, p))
+}
+
+func (p TCPPacket) Valid() bool {
+	return len(p) >= TCPHeaderSize
+}
+
+func (p TCPPacket) Verify(sourceAddress net.IP, targetAddress net.IP) error {
+	var checksum [2]byte
+	checksum[0] = p[16]
+	checksum[1] = p[17]
+
+	// reset checksum
+	p[16] = 0
+	p[17] = 0
+
+	// restore checksum
+	defer func() {
+		p[16] = checksum[0]
+		p[17] = checksum[1]
+	}()
+
+	// check checksum
+	s := uint32(0)
+	s += Sum(sourceAddress)
+	s += Sum(targetAddress)
+	s += uint32(TCP)
+	s += uint32(len(p))
+
+	check := Checksum(s, p)
+	if checksum[0] != check[0] || checksum[1] != check[1] {
+		return ErrInvalidChecksum
+	}
+
+	return nil
+}

listener/tun/ipstack/system/mars/tcpip/tcpip.go

@@ -0,0 +1,24 @@
+package tcpip
+
+var zeroChecksum = [2]byte{0x00, 0x00}
+
+var SumFnc = SumCompat
+
+func Sum(b []byte) uint32 {
+	return SumFnc(b)
+}
+
+// Checksum for Internet Protocol family headers
+func Checksum(sum uint32, b []byte) (answer [2]byte) {
+	sum += Sum(b)
+	sum = (sum >> 16) + (sum & 0xffff)
+	sum += sum >> 16
+	sum = ^sum
+	answer[0] = byte(sum >> 8)
+	answer[1] = byte(sum)
+	return
+}
+
+func SetIPv4(packet []byte) {
+	packet[0] = (packet[0] & 0x0f) | (4 << 4)
+}

listener/tun/ipstack/system/mars/tcpip/tcpip_amd64.go

@@ -0,0 +1,26 @@
+//go:build !noasm
+
+package tcpip
+
+import (
+	"unsafe"
+
+	"golang.org/x/sys/cpu"
+)
+
+//go:noescape
+func sumAsmAvx2(data unsafe.Pointer, length uintptr) uintptr
+
+func SumAVX2(data []byte) uint32 {
+	if len(data) == 0 {
+		return 0
+	}
+
+	return uint32(sumAsmAvx2(unsafe.Pointer(&data[0]), uintptr(len(data))))
+}
+
+func init() {
+	if cpu.X86.HasAVX2 {
+		SumFnc = SumAVX2
+	}
+}

listener/tun/ipstack/system/mars/tcpip/tcpip_amd64.s

@@ -0,0 +1,140 @@
+#include "textflag.h"
+
+DATA endian_swap_mask<>+0(SB)/8, $0x607040502030001
+DATA endian_swap_mask<>+8(SB)/8, $0xE0F0C0D0A0B0809
+DATA endian_swap_mask<>+16(SB)/8, $0x607040502030001
+DATA endian_swap_mask<>+24(SB)/8, $0xE0F0C0D0A0B0809
+GLOBL endian_swap_mask<>(SB), RODATA, $32
+
+// func sumAsmAvx2(data unsafe.Pointer, length uintptr) uintptr
+//
+// args (8 bytes aligned):
+//   data   unsafe.Pointer - 8 bytes - 0 offset
+//   length uintptr        - 8 bytes - 8 offset
+//   result uintptr        - 8 bytes - 16 offset
+#define PDATA   AX
+#define LENGTH  CX
+#define RESULT  BX
+TEXT ·sumAsmAvx2(SB),NOSPLIT,$0-24
+    MOVQ data+0(FP), PDATA
+    MOVQ length+8(FP), LENGTH
+    XORQ RESULT, RESULT
+
+#define VSUM             Y0
+#define ENDIAN_SWAP_MASK Y1
+BEGIN:
+    VMOVDQU endian_swap_mask<>(SB), ENDIAN_SWAP_MASK
+    VPXOR VSUM, VSUM, VSUM
+
+#define LOADED_0 Y2
+#define LOADED_1 Y3
+#define LOADED_2 Y4
+#define LOADED_3 Y5
+BATCH_64:
+    CMPQ LENGTH, $64
+    JB BATCH_32
+    VPMOVZXWD (PDATA), LOADED_0
+    VPMOVZXWD 16(PDATA), LOADED_1
+    VPMOVZXWD 32(PDATA), LOADED_2
+    VPMOVZXWD 48(PDATA), LOADED_3
+    VPSHUFB ENDIAN_SWAP_MASK, LOADED_0, LOADED_0
+    VPSHUFB ENDIAN_SWAP_MASK, LOADED_1, LOADED_1
+    VPSHUFB ENDIAN_SWAP_MASK, LOADED_2, LOADED_2
+    VPSHUFB ENDIAN_SWAP_MASK, LOADED_3, LOADED_3
+    VPADDD LOADED_0, VSUM, VSUM
+    VPADDD LOADED_1, VSUM, VSUM
+    VPADDD LOADED_2, VSUM, VSUM
+    VPADDD LOADED_3, VSUM, VSUM
+    ADDQ $-64, LENGTH
+    ADDQ $64, PDATA
+    JMP BATCH_64
+#undef LOADED_0
+#undef LOADED_1
+#undef LOADED_2
+#undef LOADED_3
+
+#define LOADED_0 Y2
+#define LOADED_1 Y3
+BATCH_32:
+    CMPQ LENGTH, $32
+    JB BATCH_16
+    VPMOVZXWD (PDATA), LOADED_0
+    VPMOVZXWD 16(PDATA), LOADED_1
+    VPSHUFB ENDIAN_SWAP_MASK, LOADED_0, LOADED_0
+    VPSHUFB ENDIAN_SWAP_MASK, LOADED_1, LOADED_1
+    VPADDD LOADED_0, VSUM, VSUM
+    VPADDD LOADED_1, VSUM, VSUM
+    ADDQ $-32, LENGTH
+    ADDQ $32, PDATA
+    JMP BATCH_32
+#undef LOADED_0
+#undef LOADED_1
+
+#define LOADED Y2
+BATCH_16:
+    CMPQ LENGTH, $16
+    JB COLLECT
+    VPMOVZXWD (PDATA), LOADED
+    VPSHUFB ENDIAN_SWAP_MASK, LOADED, LOADED
+    VPADDD LOADED, VSUM, VSUM
+    ADDQ $-16, LENGTH
+    ADDQ $16, PDATA
+    JMP BATCH_16
+#undef LOADED
+
+#define EXTRACTED Y2
+#define EXTRACTED_128 X2
+#define TEMP_64 DX
+COLLECT:
+    VEXTRACTI128 $0, VSUM, EXTRACTED_128
+    VPEXTRD $0, EXTRACTED_128, TEMP_64
+    ADDL TEMP_64, RESULT
+    VPEXTRD $1, EXTRACTED_128, TEMP_64
+    ADDL TEMP_64, RESULT
+    VPEXTRD $2, EXTRACTED_128, TEMP_64
+    ADDL TEMP_64, RESULT
+    VPEXTRD $3, EXTRACTED_128, TEMP_64
+    ADDL TEMP_64, RESULT
+    VEXTRACTI128 $1, VSUM, EXTRACTED_128
+    VPEXTRD $0, EXTRACTED_128, TEMP_64
+    ADDL TEMP_64, RESULT
+    VPEXTRD $1, EXTRACTED_128, TEMP_64
+    ADDL TEMP_64, RESULT
+    VPEXTRD $2, EXTRACTED_128, TEMP_64
+    ADDL TEMP_64, RESULT
+    VPEXTRD $3, EXTRACTED_128, TEMP_64
+    ADDL TEMP_64, RESULT
+#undef EXTRACTED
+#undef EXTRACTED_128
+#undef TEMP_64
+
+#define TEMP DX
+#define TEMP2 SI
+BATCH_2:
+    CMPQ LENGTH, $2
+    JB BATCH_1
+    XORQ TEMP, TEMP
+    MOVW (PDATA), TEMP
+    MOVQ TEMP, TEMP2
+    SHRW $8, TEMP2
+    SHLW $8, TEMP
+    ORW TEMP2, TEMP
+    ADDL TEMP, RESULT
+    ADDQ $-2, LENGTH
+    ADDQ $2, PDATA
+    JMP BATCH_2
+#undef TEMP
+
+#define TEMP DX
+BATCH_1:
+    CMPQ LENGTH, $0
+    JZ RETURN
+    XORQ TEMP, TEMP
+    MOVB (PDATA), TEMP
+    SHLW $8, TEMP
+    ADDL TEMP, RESULT
+#undef TEMP
+
+RETURN:
+    MOVQ RESULT, result+16(FP)
+    RET

listener/tun/ipstack/system/mars/tcpip/tcpip_amd64_test.go

@@ -0,0 +1,51 @@
+package tcpip
+
+import (
+	"crypto/rand"
+	"testing"
+
+	"golang.org/x/sys/cpu"
+)
+
+func Test_SumAVX2(t *testing.T) {
+	if !cpu.X86.HasAVX2 {
+		t.Skipf("AVX2 unavailable")
+	}
+
+	bytes := make([]byte, chunkSize)
+
+	for size := 0; size <= chunkSize; size++ {
+		for count := 0; count < chunkCount; count++ {
+			_, err := rand.Reader.Read(bytes[:size])
+			if err != nil {
+				t.Skipf("Rand read failed: %v", err)
+			}
+
+			compat := SumCompat(bytes[:size])
+			avx := SumAVX2(bytes[:size])
+
+			if compat != avx {
+				t.Errorf("Sum of length=%d mismatched", size)
+			}
+		}
+	}
+}
+
+func Benchmark_SumAVX2(b *testing.B) {
+	if !cpu.X86.HasAVX2 {
+		b.Skipf("AVX2 unavailable")
+	}
+
+	bytes := make([]byte, chunkSize)
+
+	_, err := rand.Reader.Read(bytes)
+	if err != nil {
+		b.Skipf("Rand read failed: %v", err)
+	}
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		SumAVX2(bytes)
+	}
+}

listener/tun/ipstack/system/mars/tcpip/tcpip_arm64.go

@@ -0,0 +1,24 @@
+package tcpip
+
+import (
+	"unsafe"
+
+	"golang.org/x/sys/cpu"
+)
+
+//go:noescape
+func sumAsmNeon(data unsafe.Pointer, length uintptr) uintptr
+
+func SumNeon(data []byte) uint32 {
+	if len(data) == 0 {
+		return 0
+	}
+
+	return uint32(sumAsmNeon(unsafe.Pointer(&data[0]), uintptr(len(data))))
+}
+
+func init() {
+	if cpu.ARM64.HasASIMD {
+		SumFnc = SumNeon
+	}
+}

listener/tun/ipstack/system/mars/tcpip/tcpip_arm64.s

@@ -0,0 +1,118 @@
+#include "textflag.h"
+
+// func sumAsmNeon(data unsafe.Pointer, length uintptr) uintptr
+//
+// args (8 bytes aligned):
+//   data   unsafe.Pointer - 8 bytes - 0 offset
+//   length uintptr        - 8 bytes - 8 offset
+//   result uintptr        - 8 bytes - 16 offset
+#define PDATA  R0
+#define LENGTH R1
+#define RESULT R2
+#define VSUM V0
+TEXT ·sumAsmNeon(SB),NOSPLIT,$0-24
+    MOVD data+0(FP), PDATA
+    MOVD length+8(FP), LENGTH
+    MOVD $0, RESULT
+    VMOVQ $0, $0, VSUM
+
+#define LOADED_0 V1
+#define LOADED_1 V2
+#define LOADED_2 V3
+#define LOADED_3 V4
+BATCH_32:
+    CMP $32, LENGTH
+    BLO BATCH_16
+    VLD1 (PDATA), [LOADED_0.B8, LOADED_1.B8, LOADED_2.B8, LOADED_3.B8]
+    VREV16 LOADED_0.B8, LOADED_0.B8
+    VREV16 LOADED_1.B8, LOADED_1.B8
+    VREV16 LOADED_2.B8, LOADED_2.B8
+    VREV16 LOADED_3.B8, LOADED_3.B8
+    VUSHLL $0, LOADED_0.H4, LOADED_0.S4
+    VUSHLL $0, LOADED_1.H4, LOADED_1.S4
+    VUSHLL $0, LOADED_2.H4, LOADED_2.S4
+    VUSHLL $0, LOADED_3.H4, LOADED_3.S4
+    VADD LOADED_0.S4, VSUM.S4, VSUM.S4
+    VADD LOADED_1.S4, VSUM.S4, VSUM.S4
+    VADD LOADED_2.S4, VSUM.S4, VSUM.S4
+    VADD LOADED_3.S4, VSUM.S4, VSUM.S4
+    ADD $-32, LENGTH
+    ADD $32, PDATA
+    B BATCH_32
+#undef LOADED_0
+#undef LOADED_1
+#undef LOADED_2
+#undef LOADED_3
+
+#define LOADED_0 V1
+#define LOADED_1 V2
+BATCH_16:
+    CMP $16, LENGTH
+    BLO BATCH_8
+    VLD1 (PDATA), [LOADED_0.B8, LOADED_1.B8]
+    VREV16 LOADED_0.B8, LOADED_0.B8
+    VREV16 LOADED_1.B8, LOADED_1.B8
+    VUSHLL $0, LOADED_0.H4, LOADED_0.S4
+    VUSHLL $0, LOADED_1.H4, LOADED_1.S4
+    VADD LOADED_0.S4, VSUM.S4, VSUM.S4
+    VADD LOADED_1.S4, VSUM.S4, VSUM.S4
+    ADD $-16, LENGTH
+    ADD $16, PDATA
+    B BATCH_16
+#undef LOADED_0
+#undef LOADED_1
+
+#define LOADED_0 V1
+BATCH_8:
+    CMP $8, LENGTH
+    BLO BATCH_2
+    VLD1 (PDATA), [LOADED_0.B8]
+    VREV16 LOADED_0.B8, LOADED_0.B8
+    VUSHLL $0, LOADED_0.H4, LOADED_0.S4
+    VADD LOADED_0.S4, VSUM.S4, VSUM.S4
+    ADD $-8, LENGTH
+    ADD $8, PDATA
+    B BATCH_8
+#undef LOADED_0
+
+#define LOADED_L R3
+#define LOADED_H R4
+BATCH_2:
+    CMP $2, LENGTH
+    BLO BATCH_1
+    MOVBU (PDATA), LOADED_H
+    MOVBU 1(PDATA), LOADED_L
+    LSL $8, LOADED_H
+    ORR LOADED_H, LOADED_L, LOADED_L
+    ADD LOADED_L, RESULT, RESULT
+    ADD $2, PDATA
+    ADD $-2, LENGTH
+    B BATCH_2
+#undef LOADED_H
+#undef LOADED_L
+
+#define LOADED R3
+BATCH_1:
+    CMP $1, LENGTH
+    BLO COLLECT
+    MOVBU (PDATA), LOADED
+    LSL $8, LOADED
+    ADD LOADED, RESULT, RESULT
+
+#define EXTRACTED R3
+COLLECT:
+    VMOV VSUM.S[0], EXTRACTED
+    ADD EXTRACTED, RESULT
+    VMOV VSUM.S[1], EXTRACTED
+    ADD EXTRACTED, RESULT
+    VMOV VSUM.S[2], EXTRACTED
+    ADD EXTRACTED, RESULT
+    VMOV VSUM.S[3], EXTRACTED
+    ADD EXTRACTED, RESULT
+#undef VSUM
+#undef PDATA
+#undef LENGTH
+
+RETURN:
+    MOVD RESULT, result+16(FP)
+    RET

listener/tun/ipstack/system/mars/tcpip/tcpip_arm64_test.go

@@ -0,0 +1,51 @@
+package tcpip
+
+import (
+	"crypto/rand"
+	"testing"
+
+	"golang.org/x/sys/cpu"
+)
+
+func Test_SumNeon(t *testing.T) {
+	if !cpu.ARM64.HasASIMD {
+		t.Skipf("Neon unavailable")
+	}
+
+	bytes := make([]byte, chunkSize)
+
+	for size := 0; size <= chunkSize; size++ {
+		for count := 0; count < chunkCount; count++ {
+			_, err := rand.Reader.Read(bytes[:size])
+			if err != nil {
+				t.Skipf("Rand read failed: %v", err)
+			}
+
+			compat := SumCompat(bytes[:size])
+			neon := sumNeon(bytes[:size])
+
+			if compat != neon {
+				t.Errorf("Sum of length=%d mismatched", size)
+			}
+		}
+	}
+}
+
+func Benchmark_SumNeon(b *testing.B) {
+	if !cpu.ARM64.HasASIMD {
+		b.Skipf("Neon unavailable")
+	}
+
+	bytes := make([]byte, chunkSize)
+
+	_, err := rand.Reader.Read(bytes)
+	if err != nil {
+		b.Skipf("Rand read failed: %v", err)
+	}
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		sumNeon(bytes)
+	}
+}

listener/tun/ipstack/system/mars/tcpip/tcpip_compat.go

@@ -0,0 +1,14 @@
+package tcpip
+
+func SumCompat(b []byte) (sum uint32) {
+	n := len(b)
+	if n&1 != 0 {
+		n--
+		sum += uint32(b[n]) << 8
+	}
+
+	for i := 0; i < n; i += 2 {
+		sum += (uint32(b[i]) << 8) | uint32(b[i+1])
+	}
+	return
+}

listener/tun/ipstack/system/mars/tcpip/tcpip_compat_test.go

@@ -0,0 +1,26 @@
+package tcpip
+
+import (
+	"crypto/rand"
+	"testing"
+)
+
+const (
+	chunkSize  = 9000
+	chunkCount = 10
+)
+
+func Benchmark_SumCompat(b *testing.B) {
+	bytes := make([]byte, chunkSize)
+
+	_, err := rand.Reader.Read(bytes)
+	if err != nil {
+		b.Skipf("Rand read failed: %v", err)
+	}
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		SumCompat(bytes)
+	}
+}

listener/tun/ipstack/system/mars/tcpip/udp.go

@@ -0,0 +1,55 @@
+package tcpip
+
+import (
+	"encoding/binary"
+)
+
+const UDPHeaderSize = 8
+
+type UDPPacket []byte
+
+func (p UDPPacket) Length() uint16 {
+	return binary.BigEndian.Uint16(p[4:])
+}
+
+func (p UDPPacket) SetLength(length uint16) {
+	binary.BigEndian.PutUint16(p[4:], length)
+}
+
+func (p UDPPacket) SourcePort() uint16 {
+	return binary.BigEndian.Uint16(p)
+}
+
+func (p UDPPacket) SetSourcePort(port uint16) {
+	binary.BigEndian.PutUint16(p, port)
+}
+
+func (p UDPPacket) DestinationPort() uint16 {
+	return binary.BigEndian.Uint16(p[2:])
+}
+
+func (p UDPPacket) SetDestinationPort(port uint16) {
+	binary.BigEndian.PutUint16(p[2:], port)
+}
+
+func (p UDPPacket) Payload() []byte {
+	return p[UDPHeaderSize:p.Length()]
+}
+
+func (p UDPPacket) Checksum() uint16 {
+	return binary.BigEndian.Uint16(p[6:])
+}
+
+func (p UDPPacket) SetChecksum(sum [2]byte) {
+	p[6] = sum[0]
+	p[7] = sum[1]
+}
+
+func (p UDPPacket) ResetChecksum(psum uint32) {
+	p.SetChecksum(zeroChecksum)
+	p.SetChecksum(Checksum(psum, p))
+}
+
+func (p UDPPacket) Valid() bool {
+	return len(p) >= UDPHeaderSize && uint16(len(p)) >= p.Length()
+}

listener/tun/ipstack/system/stack.go

@@ -0,0 +1,204 @@
+package system
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+	"net/netip"
+	"runtime"
+	"strconv"
+	"time"
+
+	"github.com/Dreamacro/clash/adapter/inbound"
+	"github.com/Dreamacro/clash/common/pool"
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/context"
+	"github.com/Dreamacro/clash/listener/tun/device"
+	"github.com/Dreamacro/clash/listener/tun/ipstack"
+	D "github.com/Dreamacro/clash/listener/tun/ipstack/commons"
+	"github.com/Dreamacro/clash/listener/tun/ipstack/system/mars"
+	"github.com/Dreamacro/clash/log"
+	"github.com/Dreamacro/clash/transport/socks5"
+)
+
+type sysStack struct {
+	stack  io.Closer
+	device device.Device
+}
+
+func (s sysStack) Close() error {
+	if s.stack != nil {
+		_ = s.stack.Close()
+	}
+	if s.device != nil {
+		_ = s.device.Close()
+	}
+	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()
+		portal  = gateway.Next()
+	)
+
+	stack, err := mars.StartListener(device, gateway, portal)
+	if err != nil {
+		_ = device.Close()
+
+		return nil, err
+	}
+
+	dnsAddr := dnsHijack
+
+	tcp := func() {
+		defer stack.TCP().Close()
+		defer log.Debugln("TCP: closed")
+
+		for stack.TCP().SetDeadline(time.Time{}) == nil {
+			conn, err := stack.TCP().Accept()
+			if err != nil {
+				log.Debugln("Accept connection: %v", err)
+
+				continue
+			}
+
+			lAddr := conn.LocalAddr().(*net.TCPAddr)
+			rAddr := conn.RemoteAddr().(*net.TCPAddr)
+
+			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())
+
+					defer conn.Close()
+
+					buf := pool.Get(pool.UDPBufferSize)
+					defer pool.Put(buf)
+
+					for {
+						conn.SetReadDeadline(time.Now().Add(C.DefaultTCPTimeout))
+
+						length := uint16(0)
+						if err := binary.Read(conn, binary.BigEndian, &length); err != nil {
+							break
+						}
+
+						if int(length) > len(buf) {
+							break
+						}
+
+						n, err := conn.Read(buf[:length])
+						if err != nil {
+							break
+						}
+
+						msg, err := D.RelayDnsPacket(buf[:n])
+						if err != nil {
+							break
+						}
+
+						_, _ = conn.Write(msg)
+					}
+				}()
+
+				continue
+			}
+
+			metadata := &C.Metadata{
+				NetWork:  C.TCP,
+				Type:     C.TUN,
+				SrcIP:    lAddr.IP,
+				DstIP:    rAddr.IP,
+				SrcPort:  strconv.Itoa(lAddr.Port),
+				DstPort:  strconv.Itoa(rAddr.Port),
+				AddrType: C.AtypIPv4,
+				Host:     "",
+			}
+
+			tcpIn <- context.NewConnContext(conn, metadata)
+		}
+	}
+
+	udp := func() {
+		defer stack.UDP().Close()
+		defer log.Debugln("UDP: closed")
+
+		for {
+			buf := pool.Get(pool.UDPBufferSize)
+
+			n, lRAddr, rRAddr, err := stack.UDP().ReadFrom(buf)
+			if err != nil {
+				return
+			}
+
+			raw := buf[:n]
+			lAddr := lRAddr.(*net.UDPAddr)
+			rAddr := rRAddr.(*net.UDPAddr)
+
+			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)
+
+					msg, err := D.RelayDnsPacket(raw)
+					if err != nil {
+						return
+					}
+
+					_, _ = stack.UDP().WriteTo(msg, rAddr, lAddr)
+
+					log.Debugln("[TUN] hijack dns udp: %s", rAddrPort.String())
+				}()
+
+				continue
+			}
+
+			pkt := &packet{
+				local: lAddr,
+				data:  raw,
+				writeBack: func(b []byte, addr net.Addr) (int, error) {
+					return stack.UDP().WriteTo(b, addr, lAddr)
+				},
+				drop: func() {
+					pool.Put(buf)
+				},
+			}
+
+			select {
+			case udpIn <- inbound.NewPacket(socks5.ParseAddrToSocksAddr(rAddr), pkt, C.TUN):
+			default:
+			}
+		}
+	}
+
+	go tcp()
+
+	numUDPWorkers := 4
+	if num := runtime.GOMAXPROCS(0); num > numUDPWorkers {
+		numUDPWorkers = num
+	}
+	for i := 0; i < numUDPWorkers; i++ {
+		go udp()
+	}
+
+	return &sysStack{stack: stack, device: device}, nil
+}

listener/tun/ipstack/system/tcp.go

@@ -1,46 +0,0 @@
-package system
-
-import (
-	"net"
-	"strconv"
-
-	"github.com/kr328/tun2socket/binding"
-
-	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/context"
-)
-
-func handleTCP(conn net.Conn, endpoint *binding.Endpoint, tcpIn chan<- C.ConnContext) {
-	src := &net.TCPAddr{
-		IP:   endpoint.Source.IP,
-		Port: int(endpoint.Source.Port),
-		Zone: "",
-	}
-
-	dst := &net.TCPAddr{
-		IP:   endpoint.Target.IP,
-		Port: int(endpoint.Target.Port),
-		Zone: "",
-	}
-
-	addrType := C.AtypIPv4
-	if dst.IP.To4() == nil {
-		addrType = C.AtypIPv6
-	}
-
-	metadata := &C.Metadata{
-		NetWork:  C.TCP,
-		Type:     C.TUN,
-		SrcIP:    src.IP,
-		DstIP:    dst.IP,
-		SrcPort:  strconv.Itoa(src.Port),
-		DstPort:  strconv.Itoa(dst.Port),
-		AddrType: addrType,
-		Host:     "",
-	}
-
-	//if c, ok := conn.(*net.TCPConn); ok {
-	//	c.SetKeepAlive(true)
-	//}
-	tcpIn <- context.NewConnContext(conn, metadata)
-}

listener/tun/ipstack/system/tun.go

@@ -1,116 +0,0 @@
-package system
-
-import (
-	"net"
-	"strconv"
-	"sync"
-
-	"github.com/Dreamacro/clash/adapter/inbound"
-	"github.com/Dreamacro/clash/config"
-	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/listener/tun/dev"
-	"github.com/Dreamacro/clash/listener/tun/ipstack"
-	"github.com/Dreamacro/clash/log"
-	"github.com/kr328/tun2socket"
-	"github.com/kr328/tun2socket/binding"
-	"github.com/kr328/tun2socket/redirect"
-)
-
-type systemAdapter struct {
-	device      dev.TunDevice
-	tun         *tun2socket.Tun2Socket
-	lock        sync.Mutex
-	stackName   string
-	dnsHackjack []string
-	autoRoute   bool
-}
-
-func NewAdapter(device dev.TunDevice, conf config.Tun, mtu int, gateway, mirror string, onStop func(), tcpIn chan<- C.ConnContext, udpIn chan<- *inbound.PacketAdapter) (ipstack.TunAdapter, error) {
-	adapter := &systemAdapter{
-		device:      device,
-		stackName:   conf.Stack,
-		dnsHackjack: conf.DnsHijack,
-		autoRoute:   conf.AutoRoute,
-	}
-
-	adapter.lock.Lock()
-	defer adapter.lock.Unlock()
-
-	dnsHost, dnsPort, err := net.SplitHostPort(conf.DnsHijack[0])
-	if err != nil {
-		return nil, err
-	}
-
-	dnsP, err := strconv.Atoi(dnsPort)
-	if err != nil {
-		return nil, err
-	}
-
-	dnsAddr := binding.Address{
-		IP:   net.ParseIP(dnsHost),
-		Port: uint16(dnsP),
-	}
-
-	t := tun2socket.NewTun2Socket(device, mtu, net.ParseIP(gateway), net.ParseIP(mirror))
-
-	t.SetAllocator(allocUDP)
-	t.SetClosedHandler(onStop)
-	t.SetLogger(&logger{})
-
-	t.SetTCPHandler(func(conn net.Conn, endpoint *binding.Endpoint) {
-		if shouldHijackDns(dnsAddr, endpoint.Target) {
-			hijackTCPDns(conn)
-			log.Debugln("[TUN] hijack dns tcp: %s:%d", endpoint.Target.IP.String(), endpoint.Target.Port)
-			return
-		}
-
-		handleTCP(conn, endpoint, tcpIn)
-	})
-	t.SetUDPHandler(func(payload []byte, endpoint *binding.Endpoint, sender redirect.UDPSender) {
-		if shouldHijackDns(dnsAddr, endpoint.Target) {
-			hijackUDPDns(payload, endpoint, sender)
-			log.Debugln("[TUN] hijack dns udp: %s:%d", endpoint.Target.IP.String(), endpoint.Target.Port)
-			return
-		}
-
-		handleUDP(payload, endpoint, sender, udpIn)
-	})
-
-	t.Start()
-
-	adapter.tun = t
-
-	return adapter, nil
-}
-
-func (t *systemAdapter) Stack() string {
-	return t.stackName
-}
-
-func (t *systemAdapter) AutoRoute() bool {
-	return t.autoRoute
-}
-
-func (t *systemAdapter) DnsHijack() []string {
-	return t.dnsHackjack
-}
-
-func (t *systemAdapter) Close() {
-	t.lock.Lock()
-	defer t.lock.Unlock()
-
-	t.stopLocked()
-}
-
-func (t *systemAdapter) stopLocked() {
-	if t.tun != nil {
-		t.tun.Close()
-	}
-
-	if t.device != nil {
-		_ = t.device.Close()
-	}
-
-	t.tun = nil
-	t.device = nil
-}

listener/tun/ipstack/system/udp.go

@@ -1,74 +1,26 @@
 package system
 
-import (
+import "net"
-	"io"
-	"net"
 
-	"github.com/Dreamacro/clash/adapter/inbound"
+type packet struct {
-	"github.com/Dreamacro/clash/common/pool"
+	local     *net.UDPAddr
-	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/transport/socks5"
-	"github.com/kr328/tun2socket/binding"
-	"github.com/kr328/tun2socket/redirect"
-)
-
-type udpPacket struct {
-	source binding.Address
 	data      []byte
-	send   redirect.UDPSender
+	writeBack func(b []byte, addr net.Addr) (int, error)
+	drop      func()
 }
 
-func (u *udpPacket) Data() []byte {
+func (pkt *packet) Data() []byte {
-	return u.data
+	return pkt.data
 }
 
-func (u *udpPacket) WriteBack(b []byte, addr net.Addr) (n int, err error) {
+func (pkt *packet) WriteBack(b []byte, addr net.Addr) (n int, err error) {
-	uAddr, ok := addr.(*net.UDPAddr)
+	return pkt.writeBack(b, addr)
-	if !ok {
-		return 0, io.ErrClosedPipe
-	}
-
-	return len(b), u.send(b, &binding.Endpoint{
-		Source: binding.Address{IP: uAddr.IP, Port: uint16(uAddr.Port)},
-		Target: u.source,
-	})
 }
 
-func (u *udpPacket) Drop() {
+func (pkt *packet) Drop() {
-	recycleUDP(u.data)
+	pkt.drop()
 }
 
-func (u *udpPacket) LocalAddr() net.Addr {
+func (pkt *packet) LocalAddr() net.Addr {
-	return &net.UDPAddr{
+	return pkt.local
-		IP:   u.source.IP,
-		Port: int(u.source.Port),
-		Zone: "",
-	}
-}
-
-func handleUDP(payload []byte, endpoint *binding.Endpoint, sender redirect.UDPSender, udpIn chan<- *inbound.PacketAdapter) {
-	pkt := &udpPacket{
-		source: endpoint.Source,
-		data:   payload,
-		send:   sender,
-	}
-
-	rAddr := &net.UDPAddr{
-		IP:   endpoint.Target.IP,
-		Port: int(endpoint.Target.Port),
-		Zone: "",
-	}
-
-	select {
-	case udpIn <- inbound.NewPacket(socks5.ParseAddrToSocksAddr(rAddr), pkt, C.TUN):
-	default:
-	}
-}
-
-func allocUDP(size int) []byte {
-	return pool.Get(size)
-}
-
-func recycleUDP(payload []byte) {
-	_ = pool.Put(payload)
 }