Improve auto redirect

docs/configuration/experimental/cache-file.md

@@ -1,7 +1,3 @@
----
-icon: material/new-box
----
-
 !!! question "Since sing-box 1.8.0"
 
 !!! quote "Changes in sing-box 1.9.0"

docs/configuration/experimental/cache-file.zh.md

@@ -1,7 +1,3 @@
----
-icon: material/new-box
----
-
 !!! question "自 sing-box 1.8.0 起"
 
 !!! quote "sing-box 1.9.0 中的更改"

docs/configuration/inbound/redirect.md

@@ -1,11 +1,3 @@
----
-icon: material/new-box
----
-
-!!! quote "Changes in sing-box 1.10.0"
-
-    :material-plus: [auto_redirect](#auto_redirect)
-
 !!! quote ""
 
     Only supported on Linux and macOS.
@@ -17,11 +9,6 @@ icon: material/new-box
   "type": "redirect",
   "tag": "redirect-in",
 
-  "auto_redirect": {
-    "enabled": false,
-    "continue_on_no_permission": false
-  },
-
   ... // Listen Fields
 }
 ```
@@ -29,23 +16,3 @@ icon: material/new-box
 ### Listen Fields
 
 See [Listen Fields](/configuration/shared/listen/) for details.
-
-### Fields
-
-#### `auto_redirect`
-
-!!! question "Since sing-box 1.10.0"
-
-!!! quote ""
-
-    Only supported on Android.
-
-Automatically add iptables nat rules to hijack **IPv4 TCP** connections.
-
-It is expected to run with the Android graphical client (it will attempt to su at runtime).
-
-#### `auto_redirect.continue_on_no_permission`
-
-!!! question "Since sing-box 1.10.0"
-
-Ignore errors when the Android device is not rooted or is denied root access.

docs/configuration/inbound/redirect.zh.md

@@ -1,11 +1,3 @@
----
-icon: material/new-box
----
-
-!!! quote "sing-box 1.10.0 中的更改"
-
-    :material-plus: [auto_redirect](#auto_redirect)
-
 !!! quote ""
 
     仅支持 Linux 和 macOS。
@@ -17,35 +9,9 @@ icon: material/new-box
   "type": "redirect",
   "tag": "redirect-in",
 
-  "auto_redirect": {
-    "enabled": false,
-    "continue_on_no_permission": false
-  },
-  
   ... // 监听字段
 }
 ```
-
 ### 监听字段
 
 参阅 [监听字段](/zh/configuration/shared/listen/)。
-
-### 字段
-
-#### `auto_redirect`
-
-!!! question "自 sing-box 1.10.0 起"
-
-!!! quote ""
-
-    仅支持 Android。
-
-自动添加 iptables nat 规则以劫持 **IPv4 TCP** 连接。
-
-它预计与 Android 图形客户端一起运行（将在运行时尝试 su）。
-
-#### `auto_redirect.continue_on_no_permission`
-
-!!! question "自 sing-box 1.10.0 起"
-
-当 Android 设备未获得 root 权限或 root 访问权限被拒绝时，忽略错误。

docs/configuration/inbound/tun.md

@@ -2,6 +2,10 @@
 icon: material/new-box
 ---
 
+!!! quote "Changes in sing-box 1.10.0"
+
+    :material-plus: [auto_redirect](#auto_redirect)
+
 !!! quote "Changes in sing-box 1.9.0"
 
     :material-plus: [platform.http_proxy.bypass_domain](#platformhttp_proxybypass_domain)  
@@ -29,6 +33,7 @@ icon: material/new-box
   "gso": false,
   "auto_route": true,
   "strict_route": true,
+  "auto_redirect": false,
   "inet4_route_address": [
     "0.0.0.0/1",
     "128.0.0.0/1"
@@ -156,6 +161,35 @@ It prevents address leaks and makes DNS hijacking work on Android.
 
 It may prevent some applications (such as VirtualBox) from working properly in certain situations.
 
+#### auto_redirect
+
+!!! question "Since sing-box 1.10.0"
+
+!!! quote ""
+
+    Only supported on Linux.
+
+Automatically configure iptables to redirect TCP connections.
+
+*In Android*：
+
+* Only IPv4 is supported
+* Only local connections is forwarded
+
+To share your VPN connection over hotspot or repeater, use [VPNHotspot](https://github.com/Mygod/VPNHotspot).
+
+*In Linux*:
+
+* iptables is required (optional ip6tables)
+* `iptables_nat` module is required
+
+For OpenWrt 23.05, required extra packages are:
+
+```bash
+opkg update
+opkg install iptables-nft iptables-mod-nat-extra ip6tables-nft
+```
+
 #### inet4_route_address
 
 Use custom routes instead of default when `auto_route` is enabled.

docs/configuration/inbound/tun.zh.md

@@ -2,6 +2,10 @@
 icon: material/new-box
 ---
 
+!!! quote "sing-box 1.10.0 中的更改"
+
+    :material-plus: [auto_redirect](#auto_redirect)
+
 !!! quote "sing-box 1.9.0 中的更改"
 
     :material-plus: [platform.http_proxy.bypass_domain](#platformhttp_proxybypass_domain)  
@@ -29,6 +33,7 @@ icon: material/new-box
   "gso": false,
   "auto_route": true,
   "strict_route": true,
+  "auto_redirect": false,
   "inet4_route_address": [
     "0.0.0.0/1",
     "128.0.0.0/1"
@@ -157,6 +162,35 @@ tun 接口的 IPv6 前缀。
 
 它可能会使某些应用程序（如 VirtualBox）在某些情况下无法正常工作。
 
+#### auto_redirect
+
+!!! question "自 sing-box 1.10.0 起"
+
+!!! quote ""
+
+    仅支持 Linux。
+
+自动配置 iptables 以重定向 TCP 连接。
+
+*在 Android 中*：
+
+* 仅支持 IPv4
+* 仅转发本地连接
+
+要通过热点或中继共享您的 VPN 连接，请使用 [VPNHotspot](https://github.com/Mygod/VPNHotspot)。
+
+*在 Linux 中*:
+
+* 需要 iptables（可选 ip6tables）
+* 需要 `iptables_nat` 模块
+
+对于 OpenWrt 23.05，所需的额外软件包是：
+
+```bash
+opkg update
+opkg install iptables-nft iptables-mod-nat-extra ip6tables-nft
+```
+
 #### inet4_route_address
 
 启用 `auto_route` 时使用自定义路由而不是默认路由。

experimental/libbox/config.go

@@ -9,7 +9,6 @@ import (
 	"github.com/sagernet/sing-box"
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/common/process"
-	"github.com/sagernet/sing-box/experimental/libbox/platform"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing-tun"
 	"github.com/sagernet/sing/common/control"
@@ -98,14 +97,6 @@ func (s *platformInterfaceStub) FindProcessInfo(ctx context.Context, network str
 	return nil, os.ErrInvalid
 }
 
-func (s *platformInterfaceStub) PerAppProxyList() ([]uint32, error) {
-	return nil, os.ErrInvalid
-}
-
-func (s *platformInterfaceStub) PerAppProxyMode() int32 {
-	return platform.PerAppProxyModeDisabled
-}
-
 type interfaceMonitorStub struct{}
 
 func (s *interfaceMonitorStub) Start() error {

experimental/libbox/platform.go

@@ -22,8 +22,6 @@ type PlatformInterface interface {
 	IncludeAllNetworks() bool
 	ReadWIFIState() *WIFIState
 	ClearDNSCache()
-	PerAppProxyList() (IntegerIterator, error)
-	PerAppProxyMode() int32
 }
 
 type TunInterface interface {
@@ -56,11 +54,6 @@ type NetworkInterfaceIterator interface {
 	HasNext() bool
 }
 
-type IntegerIterator interface {
-	Next() int32
-	HasNext() bool
-}
-
 type OnDemandRule interface {
 	Target() int32
 	DNSSearchDomainMatch() StringIterator

experimental/libbox/platform/interface.go

@@ -11,12 +11,6 @@ import (
 	"github.com/sagernet/sing/common/logger"
 )
 
-const (
-	PerAppProxyModeDisabled int32 = iota
-	PerAppProxyModeExclude
-	PerAppProxyModeInclude
-)
-
 type Interface interface {
 	Initialize(ctx context.Context, router adapter.Router) error
 	UsePlatformAutoDetectInterfaceControl() bool
@@ -30,7 +24,5 @@ type Interface interface {
 	IncludeAllNetworks() bool
 	ClearDNSCache()
 	ReadWIFIState() adapter.WIFIState
-	PerAppProxyList() ([]uint32, error)
-	PerAppProxyMode() int32
 	process.Searcher
 }

experimental/libbox/service.go

@@ -229,18 +229,6 @@ func (w *platformInterfaceWrapper) ReadWIFIState() adapter.WIFIState {
 	return (adapter.WIFIState)(*wifiState)
 }
 
-func (w *platformInterfaceWrapper) PerAppProxyList() ([]uint32, error) {
-	uidIterator, err := w.iif.PerAppProxyList()
-	if err != nil {
-		return nil, err
-	}
-	return common.Map(iteratorToArray[int32](uidIterator), func(it int32) uint32 { return uint32(it) }), nil
-}
-
-func (w *platformInterfaceWrapper) PerAppProxyMode() int32 {
-	return w.iif.PerAppProxyMode()
-}
-
 func (w *platformInterfaceWrapper) DisableColors() bool {
 	return runtime.GOOS != "android"
 }

inbound/builder.go

@@ -19,7 +19,7 @@ func New(ctx context.Context, router adapter.Router, logger log.ContextLogger, o
 	case C.TypeTun:
 		return NewTun(ctx, router, logger, options.Tag, options.TunOptions, platformInterface)
 	case C.TypeRedirect:
-		return NewRedirect(ctx, router, logger, options.Tag, options.RedirectOptions, platformInterface)
+		return NewRedirect(ctx, router, logger, options.Tag, options.RedirectOptions), nil
 	case C.TypeTProxy:
 		return NewTProxy(ctx, router, logger, options.Tag, options.TProxyOptions), nil
 	case C.TypeDirect:

inbound/redirect.go

@@ -2,39 +2,25 @@ package inbound
 
 import (
 	"context"
-	"errors"
 	"net"
-	"net/netip"
-	"os"
-	"os/exec"
-	"sort"
-	"strings"
 
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/common/redir"
 	C "github.com/sagernet/sing-box/constant"
-	"github.com/sagernet/sing-box/experimental/libbox/platform"
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
-	"github.com/sagernet/sing/common"
-	"github.com/sagernet/sing/common/control"
 	E "github.com/sagernet/sing/common/exceptions"
-	F "github.com/sagernet/sing/common/format"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 )
 
 type Redirect struct {
 	myInboundAdapter
-	platformInterface platform.Interface
-	autoRedirect      option.AutoRedirectOptions
-	needSu            bool
-	suPath            string
 }
 
-func NewRedirect(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.RedirectInboundOptions, platformInterface platform.Interface) (*Redirect, error) {
+func NewRedirect(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.RedirectInboundOptions) *Redirect {
 	redirect := &Redirect{
-		myInboundAdapter: myInboundAdapter{
+		myInboundAdapter{
 			protocol:      C.TypeRedirect,
 			network:       []string{N.NetworkTCP},
 			ctx:           ctx,
@@ -43,28 +29,9 @@ func NewRedirect(ctx context.Context, router adapter.Router, logger log.ContextL
 			tag:           tag,
 			listenOptions: options.ListenOptions,
 		},
-		platformInterface: platformInterface,
-		autoRedirect:      common.PtrValueOrDefault(options.AutoRedirect),
-	}
-	if redirect.autoRedirect.Enabled {
-		if !C.IsAndroid {
-			return nil, E.New("auto redirect is only supported on Android")
-		}
-		userId := os.Getuid()
-		if userId != 0 {
-			suPath, err := exec.LookPath("/bin/su")
-			if err == nil {
-				redirect.needSu = true
-				redirect.suPath = suPath
-			} else if redirect.autoRedirect.ContinueOnNoPermission {
-				redirect.autoRedirect.Enabled = false
-			} else {
-				return nil, E.Extend(E.Cause(err, "root permission is required for auto redirect"), os.Getenv("PATH"))
-			}
-		}
 	}
 	redirect.connHandler = redirect
-	return redirect, nil
+	return redirect
 }
 
 func (r *Redirect) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
@@ -75,124 +42,3 @@ func (r *Redirect) NewConnection(ctx context.Context, conn net.Conn, metadata ad
 	metadata.Destination = M.SocksaddrFromNetIP(destination)
 	return r.newConnection(ctx, conn, metadata)
 }
-
-func (r *Redirect) Start() error {
-	err := r.myInboundAdapter.Start()
-	if err != nil {
-		return err
-	}
-	if r.autoRedirect.Enabled {
-		r.cleanupRedirect()
-		err = r.setupRedirect()
-		if err != nil {
-			var exitError *exec.ExitError
-			if errors.As(err, &exitError) && exitError.ExitCode() == 13 && r.autoRedirect.ContinueOnNoPermission {
-				r.logger.Error(E.Cause(err, "setup auto redirect"))
-				return nil
-			}
-			r.cleanupRedirect()
-			return E.Cause(err, "setup auto redirect")
-		}
-	}
-	return nil
-}
-
-func (r *Redirect) Close() error {
-	if r.autoRedirect.Enabled {
-		r.cleanupRedirect()
-	}
-	return r.myInboundAdapter.Close()
-}
-
-func (r *Redirect) setupRedirect() error {
-	tableName := "sing-box"
-	rules := `
-set -e -o pipefail
-iptables -t nat -N sing-box
-`
-	rules += strings.Join(common.FlatMap(r.router.(adapter.Router).InterfaceFinder().Interfaces(), func(it control.Interface) []string {
-		return common.Map(common.Filter(it.Addresses, func(it netip.Prefix) bool { return it.Addr().Is4() }), func(it netip.Prefix) string {
-			return "iptables -t nat -A " + tableName + " -p tcp -j RETURN -d " + it.String()
-		})
-	}), "\n")
-	var (
-		myUid           = uint32(os.Getuid())
-		perAppProxyList []uint32
-		perAppProxyMap  = make(map[uint32]bool)
-		perAppProxyMode int32
-		err             error
-	)
-	if r.platformInterface != nil {
-		perAppProxyMode = r.platformInterface.PerAppProxyMode()
-		if perAppProxyMode != platform.PerAppProxyModeDisabled {
-			perAppProxyList, err = r.platformInterface.PerAppProxyList()
-			if err != nil {
-				return E.Cause(err, "read per app proxy configuration")
-			}
-		}
-		for _, proxyUID := range perAppProxyList {
-			perAppProxyMap[proxyUID] = true
-		}
-	}
-	excludeUser := func(userID uint32) {
-		if perAppProxyMode != platform.PerAppProxyModeInclude {
-			perAppProxyMap[userID] = false
-		} else {
-			delete(perAppProxyMap, userID)
-		}
-	}
-	excludeUser(myUid)
-	if myUid != 0 && myUid != 2000 {
-		excludeUser(0)
-	}
-	perAppProxyList = perAppProxyList[:0]
-	for uid := range perAppProxyMap {
-		perAppProxyList = append(perAppProxyList, uid)
-	}
-	sort.SliceStable(perAppProxyList, func(i, j int) bool {
-		return perAppProxyList[i] < perAppProxyList[j]
-	})
-	redirectPortStr := F.ToString(M.AddrPortFromNet(r.tcpListener.Addr()).Port())
-	if perAppProxyMode != platform.PerAppProxyModeInclude {
-		rules += "\n" + strings.Join(common.Map(perAppProxyList, func(it uint32) string {
-			return "iptables -t nat -A " + tableName + " -j RETURN -m owner --uid-owner " + F.ToString(it)
-		}), "\n")
-		rules += "\niptables -t nat -A " + tableName + " -p tcp -j REDIRECT --to-ports " + redirectPortStr
-	} else {
-		rules += "\n" + strings.Join(common.Map(perAppProxyList, func(it uint32) string {
-			return "iptables -t nat -A " + tableName + " -p tcp -j REDIRECT --to-ports " + redirectPortStr + " -m owner --uid-owner " + F.ToString(it)
-		}), "\n")
-	}
-	rules += "\niptables -t nat -A OUTPUT -p tcp -j " + tableName
-	for _, ruleLine := range strings.Split(rules, "\n") {
-		ruleLine = strings.TrimSpace(ruleLine)
-		if ruleLine == "" {
-			continue
-		}
-		r.logger.Debug("# ", ruleLine)
-	}
-	return r.runAndroidShell(rules)
-}
-
-func (r *Redirect) cleanupRedirect() {
-	_ = r.runAndroidShell(`
-iptables -t nat -D OUTPUT -p tcp -j sing-box
-iptables -t nat -F sing-box
-iptables -t nat -X sing-box
-`)
-}
-
-func (r *Redirect) runAndroidShell(content string) error {
-	var command *exec.Cmd
-	if r.needSu {
-		command = exec.Command(r.suPath, "-c", "sh")
-	} else {
-		command = exec.Command("sh")
-	}
-	command.Stdin = strings.NewReader(content)
-	combinedOutput, err := command.CombinedOutput()
-	if err != nil {
-		return E.Extend(err, string(combinedOutput))
-	}
-	return nil
-}

inbound/tun.go

@@ -37,6 +37,7 @@ type Tun struct {
 	tunStack               tun.Stack
 	platformInterface      platform.Interface
 	platformOptions        option.TunPlatformOptions
+	autoRedirect           *tunAutoRedirect
 }
 
 func NewTun(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TunInboundOptions, platformInterface platform.Interface) (*Tun, error) {
@@ -50,9 +51,9 @@ func NewTun(ctx context.Context, router adapter.Router, logger log.ContextLogger
 	} else {
 		udpTimeout = C.UDPTimeout
 	}
+	var err error
 	includeUID := uidToRange(options.IncludeUID)
 	if len(options.IncludeUIDRange) > 0 {
-		var err error
 		includeUID, err = parseRange(includeUID, options.IncludeUIDRange)
 		if err != nil {
 			return nil, E.Cause(err, "parse include_uid_range")
@@ -60,13 +61,13 @@ func NewTun(ctx context.Context, router adapter.Router, logger log.ContextLogger
 	}
 	excludeUID := uidToRange(options.ExcludeUID)
 	if len(options.ExcludeUIDRange) > 0 {
-		var err error
 		excludeUID, err = parseRange(excludeUID, options.ExcludeUIDRange)
 		if err != nil {
 			return nil, E.Cause(err, "parse exclude_uid_range")
 		}
 	}
-	return &Tun{
+
+	inbound := &Tun{
 		tag:            tag,
 		ctx:            ctx,
 		router:         router,
@@ -99,7 +100,17 @@ func NewTun(ctx context.Context, router adapter.Router, logger log.ContextLogger
 		stack:                  options.Stack,
 		platformInterface:      platformInterface,
 		platformOptions:        common.PtrValueOrDefault(options.Platform),
-	}, nil
+	}
+	if options.AutoRedirect {
+		if !options.AutoRoute {
+			return nil, E.New("`auto_route` is required by `auto_redirect`")
+		}
+		inbound.autoRedirect, err = newAutoRedirect(inbound)
+		if err != nil {
+			return nil, E.Cause(err, "initialize auto redirect")
+		}
+	}
+	return inbound, nil
 }
 
 func uidToRange(uidList option.Listable[uint32]) []ranges.Range[uint32] {
@@ -195,6 +206,14 @@ func (t *Tun) Start() error {
 	if err != nil {
 		return err
 	}
+	if t.autoRedirect != nil {
+		monitor.Start("initiating auto redirect")
+		err = t.autoRedirect.Start(t.tunOptions.Name)
+		monitor.Finish()
+		if err != nil {
+			return E.Cause(err, "auto redirect")
+		}
+	}
 	t.logger.Info("started at ", t.tunOptions.Name)
 	return nil
 }
@@ -203,6 +222,7 @@ func (t *Tun) Close() error {
 	return common.Close(
 		t.tunStack,
 		t.tunIf,
+		common.PtrOrNil(t.autoRedirect),
 	)
 }
 

inbound/tun_auto_redirect.go

@@ -0,0 +1,321 @@
+package inbound
+
+import (
+	"context"
+	"net"
+	"net/netip"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/redir"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing-tun"
+	E "github.com/sagernet/sing/common/exceptions"
+	F "github.com/sagernet/sing/common/format"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+const (
+	tableNameOutput      = "sing-box-output"
+	tableNameForward     = "sing-box-forward"
+	tableNamePreRouteing = "sing-box-prerouting"
+)
+
+type tunAutoRedirect struct {
+	myInboundAdapter
+	tunOptions    *tun.Options
+	iptablesPath  string
+	androidSu     bool
+	suPath        string
+	enableIPv6    bool
+	ip6tablesPath string
+}
+
+func newAutoRedirect(t *Tun) (*tunAutoRedirect, error) {
+	if !C.IsLinux {
+		return nil, E.New("only supported on linux")
+	}
+	server := &tunAutoRedirect{
+		myInboundAdapter: myInboundAdapter{
+			protocol: C.TypeRedirect,
+			network:  []string{N.NetworkTCP},
+			ctx:      t.ctx,
+			router:   t.router,
+			logger:   t.logger,
+			tag:      t.tag,
+			listenOptions: option.ListenOptions{
+				Listen: option.NewListenAddress(netip.AddrFrom4([4]byte{127, 0, 0, 1})),
+			},
+		},
+		tunOptions: &t.tunOptions,
+	}
+	server.connHandler = server
+	if C.IsAndroid {
+		server.iptablesPath = "/system/bin/iptables"
+		userId := os.Getuid()
+		if userId != 0 {
+			var (
+				suPath string
+				err    error
+			)
+			if t.platformInterface != nil {
+				suPath, err = exec.LookPath("/bin/su")
+			} else {
+				suPath, err = exec.LookPath("su")
+			}
+			if err == nil {
+				server.androidSu = true
+				server.suPath = suPath
+			} else {
+				return nil, E.Extend(E.Cause(err, "root permission is required for auto redirect"), os.Getenv("PATH"))
+			}
+		}
+	} else {
+		iptablesPath, err := exec.LookPath("iptables")
+		if err != nil {
+			return nil, E.Cause(err, "iptables is required")
+		}
+		server.iptablesPath = iptablesPath
+	}
+	if !C.IsAndroid && len(t.tunOptions.Inet6Address) > 0 {
+		err := server.initializeIP6Tables()
+		if err != nil {
+			t.logger.Debug("device has no ip6tables nat support: ", err)
+		}
+	}
+	return server, nil
+}
+
+func (t *tunAutoRedirect) initializeIP6Tables() error {
+	ip6tablesPath, err := exec.LookPath("ip6tables")
+	if err != nil {
+		return err
+	}
+	output, err := exec.Command(ip6tablesPath, "-t nat -L", tableNameOutput).CombinedOutput()
+	switch exitErr := err.(type) {
+	case nil:
+	case *exec.ExitError:
+		if exitErr.ExitCode() != 1 {
+			return E.Extend(err, string(output))
+		}
+	default:
+		return err
+	}
+	t.ip6tablesPath = ip6tablesPath
+	t.enableIPv6 = true
+	return nil
+}
+
+func (t *tunAutoRedirect) Start(tunName string) error {
+	err := t.myInboundAdapter.Start()
+	if err != nil {
+		return E.Cause(err, "start redirect server")
+	}
+	t.cleanupIPTables(t.iptablesPath)
+	if t.enableIPv6 {
+		t.cleanupIPTables(t.ip6tablesPath)
+	}
+	err = t.setupIPTables(t.iptablesPath, tunName)
+	if err != nil {
+		return err
+	}
+	if t.enableIPv6 {
+		err = t.setupIPTables(t.ip6tablesPath, tunName)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (t *tunAutoRedirect) Close() error {
+	t.cleanupIPTables(t.iptablesPath)
+	if t.enableIPv6 {
+		t.cleanupIPTables(t.ip6tablesPath)
+	}
+	return t.myInboundAdapter.Close()
+}
+
+func (t *tunAutoRedirect) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
+	destination, err := redir.GetOriginalDestination(conn)
+	if err != nil {
+		return E.Cause(err, "get redirect destination")
+	}
+	metadata.Destination = M.SocksaddrFromNetIP(destination)
+	return t.newConnection(ctx, conn, metadata)
+}
+
+func (t *tunAutoRedirect) setupIPTables(iptablesPath string, tunName string) error {
+	// OUTPUT
+	err := t.runShell(iptablesPath, "-t nat -N", tableNameOutput)
+	if err != nil {
+		return err
+	}
+	err = t.runShell(iptablesPath, "-t nat -A", tableNameOutput,
+		"-p tcp -o", tunName,
+		"-j REDIRECT --to-ports", M.AddrPortFromNet(t.tcpListener.Addr()).Port())
+	if err != nil {
+		return err
+	}
+	err = t.runShell(iptablesPath, "-t nat -I OUTPUT -j", tableNameOutput)
+	if err != nil {
+		return err
+	}
+	if !t.androidSu {
+		// FORWARD
+		err = t.runShell(iptablesPath, "-N", tableNameForward)
+		if err != nil {
+			return err
+		}
+		err = t.runShell(iptablesPath, "-A", tableNameForward,
+			"-i", tunName, "-j", "ACCEPT")
+		if err != nil {
+			return err
+		}
+		err = t.runShell(iptablesPath, "-A", tableNameForward,
+			"-o", tunName, "-j", "ACCEPT")
+		if err != nil {
+			return err
+		}
+		err = t.runShell(iptablesPath, "-I FORWARD -j", tableNameForward)
+		if err != nil {
+			return err
+		}
+		// PREROUTING
+		err = t.setupIPTablesPreRouting(iptablesPath)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (t *tunAutoRedirect) setupIPTablesPreRouting(iptablesPath string) error {
+	err := t.runShell(iptablesPath, "-t nat -N", tableNamePreRouteing)
+	if err != nil {
+		return err
+	}
+	var (
+		routeAddress        []netip.Prefix
+		routeExcludeAddress []netip.Prefix
+	)
+	if t.iptablesPath == iptablesPath {
+		routeAddress = t.tunOptions.Inet4RouteAddress
+		routeExcludeAddress = t.tunOptions.Inet4RouteExcludeAddress
+	} else {
+		routeAddress = t.tunOptions.Inet6RouteAddress
+		routeExcludeAddress = t.tunOptions.Inet6RouteExcludeAddress
+	}
+	if len(routeAddress) > 0 && (len(t.tunOptions.IncludeInterface) > 0 || len(t.tunOptions.IncludeUID) > 0) {
+		return E.New("`*_route_address` is conflict with `include_interface` or `include_uid`")
+	}
+	if len(routeExcludeAddress) > 0 {
+		for _, address := range routeExcludeAddress {
+			err = t.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing,
+				"-d", address.String(), "-j RETURN")
+			if err != nil {
+				return err
+			}
+		}
+	}
+	if len(t.tunOptions.ExcludeInterface) > 0 {
+		for _, name := range t.tunOptions.ExcludeInterface {
+			err = t.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing,
+				"-o", name, "-j RETURN")
+			if err != nil {
+				return err
+			}
+		}
+	}
+	if len(t.tunOptions.ExcludeUID) > 0 {
+		for _, uid := range t.tunOptions.ExcludeUID {
+			err = t.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing,
+				"-m owner --uid-owner", uid, "-j RETURN")
+			if err != nil {
+				return err
+			}
+		}
+	}
+	for _, netIf := range t.router.(adapter.Router).InterfaceFinder().Interfaces() {
+		for _, addr := range netIf.Addresses {
+			if (t.iptablesPath == iptablesPath) != addr.Addr().Is4() {
+				continue
+			}
+			err = t.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing, "-d", addr.String(), "-j RETURN")
+			if err != nil {
+				return err
+			}
+		}
+	}
+	if len(routeAddress) > 0 {
+		for _, address := range routeAddress {
+			err = t.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing,
+				"-d", address.String(), "-p tcp -j REDIRECT --to-ports", M.AddrPortFromNet(t.tcpListener.Addr()).Port())
+			if err != nil {
+				return err
+			}
+		}
+	} else if len(t.tunOptions.IncludeInterface) > 0 || len(t.tunOptions.IncludeUID) > 0 {
+		for _, name := range t.tunOptions.IncludeInterface {
+			err = t.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing,
+				"-o", name, "-p tcp -j REDIRECT --to-ports", M.AddrPortFromNet(t.tcpListener.Addr()).Port())
+			if err != nil {
+				return err
+			}
+		}
+		for _, uidRange := range t.tunOptions.IncludeUID {
+			for i := uidRange.Start; i <= uidRange.End; i++ {
+				err = t.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing,
+					"-m owner --uid-owner", i, "-p tcp -j REDIRECT --to-ports", M.AddrPortFromNet(t.tcpListener.Addr()).Port())
+				if err != nil {
+					return err
+				}
+			}
+		}
+	} else {
+		err = t.runShell(iptablesPath, "-t nat -A", tableNamePreRouteing,
+			"-p tcp -j REDIRECT --to-ports", M.AddrPortFromNet(t.tcpListener.Addr()).Port())
+		if err != nil {
+			return err
+		}
+	}
+	err = t.runShell(iptablesPath, "-t nat -I PREROUTING -j", tableNamePreRouteing)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (t *tunAutoRedirect) cleanupIPTables(iptablesPath string) {
+	_ = t.runShell(iptablesPath, "-t nat -D OUTPUT -j", tableNameOutput)
+	_ = t.runShell(iptablesPath, "-t nat -F", tableNameOutput)
+	_ = t.runShell(iptablesPath, "-t nat -X", tableNameOutput)
+	if !t.androidSu {
+		_ = t.runShell(iptablesPath, "-D FORWARD -j", tableNameForward)
+		_ = t.runShell(iptablesPath, "-F", tableNameForward)
+		_ = t.runShell(iptablesPath, "-X", tableNameForward)
+		_ = t.runShell(iptablesPath, "-t nat -D PREROUTING -j", tableNamePreRouteing)
+		_ = t.runShell(iptablesPath, "-t nat -F", tableNamePreRouteing)
+		_ = t.runShell(iptablesPath, "-t nat -X", tableNamePreRouteing)
+	}
+}
+
+func (t *tunAutoRedirect) runShell(commands ...any) error {
+	commandStr := strings.Join(F.MapToString(commands), " ")
+	var command *exec.Cmd
+	if t.androidSu {
+		command = exec.Command(t.suPath, "-c", commandStr)
+	} else {
+		commandArray := strings.Split(commandStr, " ")
+		command = exec.Command(commandArray[0], commandArray[1:]...)
+	}
+	combinedOutput, err := command.CombinedOutput()
+	if err != nil {
+		return E.Extend(err, F.ToString(commandStr, ": ", string(combinedOutput)))
+	}
+	return nil
+}

option/redir.go

@@ -2,12 +2,6 @@ package option
 
 type RedirectInboundOptions struct {
 	ListenOptions
-	AutoRedirect *AutoRedirectOptions `json:"auto_redirect,omitempty"`
-}
-
-type AutoRedirectOptions struct {
-	Enabled                bool `json:"enabled,omitempty"`
-	ContinueOnNoPermission bool `json:"continue_on_no_permission,omitempty"`
 }
 
 type TProxyInboundOptions struct {

option/tun.go

@@ -9,6 +9,7 @@ type TunInboundOptions struct {
 	Inet4Address             Listable[netip.Prefix] `json:"inet4_address,omitempty"`
 	Inet6Address             Listable[netip.Prefix] `json:"inet6_address,omitempty"`
 	AutoRoute                bool                   `json:"auto_route,omitempty"`
+	AutoRedirect             bool                   `json:"auto_redirect,omitempty"`
 	StrictRoute              bool                   `json:"strict_route,omitempty"`
 	Inet4RouteAddress        Listable[netip.Prefix] `json:"inet4_route_address,omitempty"`
 	Inet6RouteAddress        Listable[netip.Prefix] `json:"inet6_route_address,omitempty"`