chore: more unmap for 4in6 address

The DNS resolution of the overall UDP part has been delayed to the connection initiation stage. During the rule matching process, it will only be triggered when the IP rule without no-resolve is matched.

For direct and wireguard outbound, the same logic as the TCP part will be followed, that is, when direct-nameserver (or DNS configured by wireguard) exists, the result of the matching process will be discarded and the domain name will be re-resolved. This re-resolution logic is only effective for fakeip.

For reject and DNS outbound, no resolution is required.

For other outbound, resolution will still be performed when the connection is initiated, and the domain name will not be sent directly to the remote server at present.

adapter/adapter.go

@@ -7,9 +7,7 @@ import (
 	"fmt"
 	"net"
 	"net/http"
-	"net/netip"
 	"net/url"
-	"strconv"
 	"strings"
 	"time"
 
@@ -316,15 +314,7 @@ func urlToMetadata(rawURL string) (addr C.Metadata, err error) {
 			return
 		}
 	}
-	uintPort, err := strconv.ParseUint(port, 10, 16)
-	if err != nil {
-		return
-	}
 
-	addr = C.Metadata{
+	err = addr.SetRemoteAddress(net.JoinHostPort(u.Hostname(), port))
-		Host:    u.Hostname(),
-		DstIP:   netip.Addr{},
-		DstPort: uint16(uintPort),
-	}
 	return
 }

adapter/inbound/util.go

@@ -4,7 +4,6 @@ import (
 	"net"
 	"net/http"
 	"net/netip"
-	"strconv"
 	"strings"
 
 	C "github.com/metacubex/mihomo/constant"
@@ -41,23 +40,8 @@ func parseHTTPAddr(request *http.Request) *C.Metadata {
 	// trim FQDN (#737)
 	host = strings.TrimRight(host, ".")
 
-	var uint16Port uint16
+	metadata := &C.Metadata{}
-	if port, err := strconv.ParseUint(port, 10, 16); err == nil {
+	_ = metadata.SetRemoteAddress(net.JoinHostPort(host, port))
-		uint16Port = uint16(port)
-	}
-
-	metadata := &C.Metadata{
-		NetWork: C.TCP,
-		Host:    host,
-		DstIP:   netip.Addr{},
-		DstPort: uint16Port,
-	}
-
-	ip, err := netip.ParseAddr(host)
-	if err == nil {
-		metadata.DstIP = ip
-	}
-
 	return metadata
 }
 

adapter/outbound/anytls.go

@@ -2,7 +2,6 @@ package outbound
 
 import (
 	"context"
-	"errors"
 	"net"
 	"strconv"
 	"time"
@@ -10,7 +9,6 @@ import (
 	CN "github.com/metacubex/mihomo/common/net"
 	"github.com/metacubex/mihomo/component/dialer"
 	"github.com/metacubex/mihomo/component/proxydialer"
-	"github.com/metacubex/mihomo/component/resolver"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/transport/anytls"
 	"github.com/metacubex/mihomo/transport/vmess"
@@ -53,6 +51,10 @@ func (t *AnyTLS) DialContext(ctx context.Context, metadata *C.Metadata) (_ C.Con
 }
 
 func (t *AnyTLS) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (_ C.PacketConn, err error) {
+	if err = t.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
+
 	// create tcp
 	c, err := t.client.CreateProxy(ctx, uot.RequestDestination(2))
 	if err != nil {
@@ -60,13 +62,6 @@ func (t *AnyTLS) ListenPacketContext(ctx context.Context, metadata *C.Metadata)
 	}
 
 	// create uot on tcp
-	if !metadata.Resolved() {
-		ip, err := resolver.ResolveIP(ctx, metadata.Host)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
-	}
 	destination := M.SocksaddrFromNet(metadata.UDPAddr())
 	return newPacketConn(CN.NewThreadSafePacketConn(uot.NewLazyConn(c, uot.Request{Destination: destination})), t), nil
 }

adapter/outbound/base.go

@@ -3,15 +3,16 @@ package outbound
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"net"
 	"runtime"
-	"strings"
 	"sync"
 	"syscall"
 
 	N "github.com/metacubex/mihomo/common/net"
 	"github.com/metacubex/mihomo/common/utils"
 	"github.com/metacubex/mihomo/component/dialer"
+	"github.com/metacubex/mihomo/component/resolver"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/log"
 )
@@ -19,6 +20,7 @@ import (
 type ProxyAdapter interface {
 	C.ProxyAdapter
 	DialOptions() []dialer.Option
+	ResolveUDP(ctx context.Context, metadata *C.Metadata) error
 }
 
 type Base struct {
@@ -160,6 +162,17 @@ func (b *Base) DialOptions() (opts []dialer.Option) {
 	return opts
 }
 
+func (b *Base) ResolveUDP(ctx context.Context, metadata *C.Metadata) error {
+	if !metadata.Resolved() {
+		ip, err := resolver.ResolveIP(ctx, metadata.Host)
+		if err != nil {
+			return fmt.Errorf("can't resolve ip: %w", err)
+		}
+		metadata.DstIP = ip
+	}
+	return nil
+}
+
 func (b *Base) Close() error {
 	return nil
 }
@@ -203,12 +216,21 @@ func NewBase(opt BaseOption) *Base {
 
 type conn struct {
 	N.ExtendedConn
-	chain                   C.Chain
+	chain       C.Chain
-	actualRemoteDestination string
+	adapterAddr string
 }
 
 func (c *conn) RemoteDestination() string {
-	return c.actualRemoteDestination
+	if remoteAddr := c.RemoteAddr(); remoteAddr != nil {
+		m := C.Metadata{}
+		if err := m.SetRemoteAddr(remoteAddr); err != nil {
+			if m.Valid() {
+				return m.String()
+			}
+		}
+	}
+	host, _, _ := net.SplitHostPort(c.adapterAddr)
+	return host
 }
 
 // Chains implements C.Connection
@@ -241,19 +263,25 @@ func NewConn(c net.Conn, a C.ProxyAdapter) C.Conn {
 	if _, ok := c.(syscall.Conn); !ok { // exclusion system conn like *net.TCPConn
 		c = N.NewDeadlineConn(c) // most conn from outbound can't handle readDeadline correctly
 	}
-	return &conn{N.NewExtendedConn(c), []string{a.Name()}, parseRemoteDestination(a.Addr())}
+	return &conn{N.NewExtendedConn(c), []string{a.Name()}, a.Addr()}
 }
 
 type packetConn struct {
 	N.EnhancePacketConn
-	chain                   C.Chain
+	chain       C.Chain
-	adapterName             string
+	adapterName string
-	connID                  string
+	connID      string
-	actualRemoteDestination string
+	adapterAddr string
+	resolveUDP  func(ctx context.Context, metadata *C.Metadata) error
+}
+
+func (c *packetConn) ResolveUDP(ctx context.Context, metadata *C.Metadata) error {
+	return c.resolveUDP(ctx, metadata)
 }
 
 func (c *packetConn) RemoteDestination() string {
-	return c.actualRemoteDestination
+	host, _, _ := net.SplitHostPort(c.adapterAddr)
+	return host
 }
 
 // Chains implements C.Connection
@@ -287,24 +315,12 @@ func (c *packetConn) AddRef(ref any) {
 	c.EnhancePacketConn = N.NewRefPacketConn(c.EnhancePacketConn, ref) // add ref for autoCloseProxyAdapter
 }
 
-func newPacketConn(pc net.PacketConn, a C.ProxyAdapter) C.PacketConn {
+func newPacketConn(pc net.PacketConn, a ProxyAdapter) C.PacketConn {
 	epc := N.NewEnhancePacketConn(pc)
 	if _, ok := pc.(syscall.Conn); !ok { // exclusion system conn like *net.UDPConn
 		epc = N.NewDeadlineEnhancePacketConn(epc) // most conn from outbound can't handle readDeadline correctly
 	}
-	return &packetConn{epc, []string{a.Name()}, a.Name(), utils.NewUUIDV4().String(), parseRemoteDestination(a.Addr())}
+	return &packetConn{epc, []string{a.Name()}, a.Name(), utils.NewUUIDV4().String(), a.Addr(), a.ResolveUDP}
-}
-
-func parseRemoteDestination(addr string) string {
-	if dst, _, err := net.SplitHostPort(addr); err == nil {
-		return dst
-	} else {
-		if addrError, ok := err.(*net.AddrError); ok && strings.Contains(addrError.Err, "missing port") {
-			return dst
-		} else {
-			return ""
-		}
-	}
 }
 
 type AddRef interface {

adapter/outbound/direct.go

@@ -2,7 +2,8 @@ package outbound
 
 import (
 	"context"
-	"errors"
+	"fmt"
+
 	"github.com/metacubex/mihomo/component/dialer"
 	"github.com/metacubex/mihomo/component/loopback"
 	"github.com/metacubex/mihomo/component/resolver"
@@ -38,13 +39,8 @@ func (d *Direct) ListenPacketContext(ctx context.Context, metadata *C.Metadata)
 	if err := d.loopBack.CheckPacketConn(metadata); err != nil {
 		return nil, err
 	}
-	// net.UDPConn.WriteTo only working with *net.UDPAddr, so we need a net.UDPAddr
+	if err := d.ResolveUDP(ctx, metadata); err != nil {
-	if !metadata.Resolved() {
+		return nil, err
-		ip, err := resolver.ResolveIPWithResolver(ctx, metadata.Host, resolver.DirectHostResolver)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
 	pc, err := dialer.NewDialer(d.DialOptions()...).ListenPacket(ctx, "udp", "", metadata.AddrPort())
 	if err != nil {
@@ -53,6 +49,17 @@ func (d *Direct) ListenPacketContext(ctx context.Context, metadata *C.Metadata)
 	return d.loopBack.NewPacketConn(newPacketConn(pc, d)), nil
 }
 
+func (d *Direct) ResolveUDP(ctx context.Context, metadata *C.Metadata) error {
+	if (!metadata.Resolved() || resolver.DirectHostResolver != resolver.DefaultResolver) && metadata.Host != "" {
+		ip, err := resolver.ResolveIPWithResolver(ctx, metadata.Host, resolver.DirectHostResolver)
+		if err != nil {
+			return fmt.Errorf("can't resolve ip: %w", err)
+		}
+		metadata.DstIP = ip
+	}
+	return nil
+}
+
 func (d *Direct) IsL3Protocol(metadata *C.Metadata) bool {
 	return true // tell DNSDialer don't send domain to DialContext, avoid lookback to DefaultResolver
 }

adapter/outbound/dns.go

@@ -3,6 +3,7 @@ package outbound
 import (
 	"context"
 	"net"
+	"net/netip"
 	"time"
 
 	N "github.com/metacubex/mihomo/common/net"
@@ -31,6 +32,9 @@ func (d *Dns) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, er
 // ListenPacketContext implements C.ProxyAdapter
 func (d *Dns) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (C.PacketConn, error) {
 	log.Debugln("[DNS] hijack udp:%s from %s", metadata.RemoteAddress(), metadata.SourceAddrPort())
+	if err := d.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 
 	ctx, cancel := context.WithCancel(context.Background())
 
@@ -41,6 +45,13 @@ func (d *Dns) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (C.
 	}, d), nil
 }
 
+func (d *Dns) ResolveUDP(ctx context.Context, metadata *C.Metadata) error {
+	if !metadata.Resolved() {
+		metadata.DstIP = netip.AddrFrom4([4]byte{127, 0, 0, 2})
+	}
+	return nil
+}
+
 type dnsPacket struct {
 	data []byte
 	put  func()

adapter/outbound/ech.go

@@ -1,10 +1,12 @@
 package outbound
 
 import (
+	"context"
 	"encoding/base64"
 	"fmt"
 
 	"github.com/metacubex/mihomo/component/ech"
+	"github.com/metacubex/mihomo/component/resolver"
 )
 
 type ECHOptions struct {
@@ -22,7 +24,13 @@ func (o ECHOptions) Parse() (*ech.Config, error) {
 		if err != nil {
 			return nil, fmt.Errorf("base64 decode ech config string failed: %v", err)
 		}
-		echConfig.EncryptedClientHelloConfigList = list
+		echConfig.GetEncryptedClientHelloConfigList = func(ctx context.Context, serverName string) ([]byte, error) {
+			return list, nil
+		}
+	} else {
+		echConfig.GetEncryptedClientHelloConfigList = func(ctx context.Context, serverName string) ([]byte, error) {
+			return resolver.ResolveECHWithResolver(ctx, serverName, resolver.ProxyServerHostResolver)
+		}
 	}
 	return echConfig, nil
 }

adapter/outbound/hysteria.go

@@ -60,6 +60,9 @@ func (h *Hysteria) DialContext(ctx context.Context, metadata *C.Metadata) (C.Con
 }
 
 func (h *Hysteria) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (C.PacketConn, error) {
+	if err := h.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	udpConn, err := h.client.DialUDP(h.genHdc(ctx))
 	if err != nil {
 		return nil, err

adapter/outbound/hysteria2.go

@@ -77,6 +77,9 @@ func (h *Hysteria2) DialContext(ctx context.Context, metadata *C.Metadata) (_ C.
 }
 
 func (h *Hysteria2) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (_ C.PacketConn, err error) {
+	if err = h.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	pc, err := h.client.ListenPacket(ctx)
 	if err != nil {
 		return nil, err

adapter/outbound/mieru.go

@@ -54,6 +54,9 @@ func (m *Mieru) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn,
 
 // ListenPacketContext implements C.ProxyAdapter
 func (m *Mieru) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (_ C.PacketConn, err error) {
+	if err = m.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	if err := m.ensureClientIsRunning(); err != nil {
 		return nil, err
 	}

adapter/outbound/reject.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"io"
 	"net"
+	"net/netip"
 	"time"
 
 	"github.com/metacubex/mihomo/common/buf"
@@ -29,9 +30,19 @@ func (r *Reject) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn,
 
 // ListenPacketContext implements C.ProxyAdapter
 func (r *Reject) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (C.PacketConn, error) {
+	if err := r.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	return newPacketConn(&nopPacketConn{}, r), nil
 }
 
+func (r *Reject) ResolveUDP(ctx context.Context, metadata *C.Metadata) error {
+	if !metadata.Resolved() {
+		metadata.DstIP = netip.IPv4Unspecified()
+	}
+	return nil
+}
+
 func NewRejectWithOption(option RejectOption) *Reject {
 	return &Reject{
 		Base: &Base{

adapter/outbound/shadowsocks.go

@@ -2,7 +2,6 @@ package outbound
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"net"
 	"strconv"
@@ -11,7 +10,6 @@ import (
 	"github.com/metacubex/mihomo/common/structure"
 	"github.com/metacubex/mihomo/component/dialer"
 	"github.com/metacubex/mihomo/component/proxydialer"
-	"github.com/metacubex/mihomo/component/resolver"
 	C "github.com/metacubex/mihomo/constant"
 	gost "github.com/metacubex/mihomo/transport/gost-plugin"
 	"github.com/metacubex/mihomo/transport/restls"
@@ -202,6 +200,9 @@ func (ss *ShadowSocks) ListenPacketWithDialer(ctx context.Context, dialer C.Dial
 			return nil, err
 		}
 	}
+	if err = ss.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	addr, err := resolveUDPAddr(ctx, "udp", ss.addr, ss.prefer)
 	if err != nil {
 		return nil, err
@@ -230,15 +231,9 @@ func (ss *ShadowSocks) ProxyInfo() C.ProxyInfo {
 // ListenPacketOnStreamConn implements C.ProxyAdapter
 func (ss *ShadowSocks) ListenPacketOnStreamConn(ctx context.Context, c net.Conn, metadata *C.Metadata) (_ C.PacketConn, err error) {
 	if ss.option.UDPOverTCP {
-		// ss uot use stream-oriented udp with a special address, so we need a net.UDPAddr
+		if err = ss.ResolveUDP(ctx, metadata); err != nil {
-		if !metadata.Resolved() {
+			return nil, err
-			ip, err := resolver.ResolveIP(ctx, metadata.Host)
-			if err != nil {
-				return nil, errors.New("can't resolve ip")
-			}
-			metadata.DstIP = ip
 		}
-
 		destination := M.SocksaddrFromNet(metadata.UDPAddr())
 		if ss.option.UDPOverTCPVersion == uot.LegacyVersion {
 			return newPacketConn(N.NewThreadSafePacketConn(uot.NewConn(c, uot.Request{Destination: destination})), ss), nil

adapter/outbound/shadowsocksr.go

@@ -105,6 +105,9 @@ func (ssr *ShadowSocksR) ListenPacketWithDialer(ctx context.Context, dialer C.Di
 			return nil, err
 		}
 	}
+	if err = ssr.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	addr, err := resolveUDPAddr(ctx, "udp", ssr.addr, ssr.prefer)
 	if err != nil {
 		return nil, err

adapter/outbound/singmux.go

@@ -2,12 +2,10 @@ package outbound
 
 import (
 	"context"
-	"errors"
 
 	CN "github.com/metacubex/mihomo/common/net"
 	"github.com/metacubex/mihomo/component/dialer"
 	"github.com/metacubex/mihomo/component/proxydialer"
-	"github.com/metacubex/mihomo/component/resolver"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/log"
 
@@ -53,16 +51,9 @@ func (s *SingMux) ListenPacketContext(ctx context.Context, metadata *C.Metadata)
 	if s.onlyTcp {
 		return s.ProxyAdapter.ListenPacketContext(ctx, metadata)
 	}
-
+	if err = s.ProxyAdapter.ResolveUDP(ctx, metadata); err != nil {
-	// sing-mux use stream-oriented udp with a special address, so we need a net.UDPAddr
+		return nil, err
-	if !metadata.Resolved() {
-		ip, err := resolver.ResolveIP(ctx, metadata.Host)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
-
 	pc, err := s.client.ListenPacket(ctx, M.SocksaddrFromNet(metadata.UDPAddr()))
 	if err != nil {
 		return nil, err

adapter/outbound/snell.go

@@ -127,6 +127,9 @@ func (s *Snell) ListenPacketWithDialer(ctx context.Context, dialer C.Dialer, met
 			return nil, err
 		}
 	}
+	if err = s.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	c, err := dialer.DialContext(ctx, "tcp", s.addr)
 	if err != nil {
 		return nil, err

adapter/outbound/socks5.go

@@ -109,6 +109,9 @@ func (ss *Socks5) ListenPacketContext(ctx context.Context, metadata *C.Metadata)
 			return nil, err
 		}
 	}
+	if err = ss.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	c, err := cDialer.DialContext(ctx, "tcp", ss.addr)
 	if err != nil {
 		err = fmt.Errorf("%s connect error: %w", ss.addr, err)

adapter/outbound/trojan.go

@@ -219,6 +219,10 @@ func (t *Trojan) DialContextWithDialer(ctx context.Context, dialer C.Dialer, met
 
 // ListenPacketContext implements C.ProxyAdapter
 func (t *Trojan) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (_ C.PacketConn, err error) {
+	if err = t.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
+
 	var c net.Conn
 
 	// grpc transport
@@ -250,6 +254,9 @@ func (t *Trojan) ListenPacketWithDialer(ctx context.Context, dialer C.Dialer, me
 			return nil, err
 		}
 	}
+	if err = t.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
 	c, err := dialer.DialContext(ctx, "tcp", t.addr)
 	if err != nil {
 		return nil, fmt.Errorf("%s connect error: %w", t.addr, err)
@@ -271,12 +278,6 @@ func (t *Trojan) SupportWithDialer() C.NetWork {
 	return C.ALLNet
 }
 
-// ListenPacketOnStreamConn implements C.ProxyAdapter
-func (t *Trojan) ListenPacketOnStreamConn(c net.Conn, metadata *C.Metadata) (_ C.PacketConn, err error) {
-	pc := trojan.NewPacketConn(c)
-	return newPacketConn(pc, t), err
-}
-
 // SupportUOT implements C.ProxyAdapter
 func (t *Trojan) SupportUOT() bool {
 	return true

adapter/outbound/tuic.go

@@ -3,7 +3,6 @@ package outbound
 import (
 	"context"
 	"crypto/tls"
-	"errors"
 	"fmt"
 	"math"
 	"net"
@@ -14,7 +13,6 @@ import (
 	"github.com/metacubex/mihomo/component/dialer"
 	"github.com/metacubex/mihomo/component/ech"
 	"github.com/metacubex/mihomo/component/proxydialer"
-	"github.com/metacubex/mihomo/component/resolver"
 	tlsC "github.com/metacubex/mihomo/component/tls"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/transport/tuic"
@@ -91,6 +89,10 @@ func (t *Tuic) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (_
 
 // ListenPacketWithDialer implements C.ProxyAdapter
 func (t *Tuic) ListenPacketWithDialer(ctx context.Context, dialer C.Dialer, metadata *C.Metadata) (_ C.PacketConn, err error) {
+	if err = t.ResolveUDP(ctx, metadata); err != nil {
+		return nil, err
+	}
+
 	if t.option.UDPOverStream {
 		uotDestination := uot.RequestDestination(uint8(t.option.UDPOverStreamVersion))
 		uotMetadata := *metadata
@@ -102,13 +104,6 @@ func (t *Tuic) ListenPacketWithDialer(ctx context.Context, dialer C.Dialer, meta
 		}
 
 		// tuic uos use stream-oriented udp with a special address, so we need a net.UDPAddr
-		if !metadata.Resolved() {
-			ip, err := resolver.ResolveIP(ctx, metadata.Host)
-			if err != nil {
-				return nil, errors.New("can't resolve ip")
-			}
-			metadata.DstIP = ip
-		}
 
 		destination := M.SocksaddrFromNet(metadata.UDPAddr())
 		if t.option.UDPOverStreamVersion == uot.LegacyVersion {

adapter/outbound/vless.go

@@ -19,7 +19,6 @@ import (
 	"github.com/metacubex/mihomo/component/dialer"
 	"github.com/metacubex/mihomo/component/ech"
 	"github.com/metacubex/mihomo/component/proxydialer"
-	"github.com/metacubex/mihomo/component/resolver"
 	tlsC "github.com/metacubex/mihomo/component/tls"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/transport/gun"
@@ -277,13 +276,8 @@ func (v *Vless) DialContextWithDialer(ctx context.Context, dialer C.Dialer, meta
 
 // ListenPacketContext implements C.ProxyAdapter
 func (v *Vless) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (_ C.PacketConn, err error) {
-	// vless use stream-oriented udp with a special address, so we need a net.UDPAddr
+	if err = v.ResolveUDP(ctx, metadata); err != nil {
-	if !metadata.Resolved() {
+		return nil, err
-		ip, err := resolver.ResolveIP(ctx, metadata.Host)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
 	var c net.Conn
 	// gun transport
@@ -315,13 +309,8 @@ func (v *Vless) ListenPacketWithDialer(ctx context.Context, dialer C.Dialer, met
 		}
 	}
 
-	// vless use stream-oriented udp with a special address, so we need a net.UDPAddr
+	if err = v.ResolveUDP(ctx, metadata); err != nil {
-	if !metadata.Resolved() {
+		return nil, err
-		ip, err := resolver.ResolveIP(ctx, metadata.Host)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
 
 	c, err := dialer.DialContext(ctx, "tcp", v.addr)
@@ -347,13 +336,8 @@ func (v *Vless) SupportWithDialer() C.NetWork {
 
 // ListenPacketOnStreamConn implements C.ProxyAdapter
 func (v *Vless) ListenPacketOnStreamConn(ctx context.Context, c net.Conn, metadata *C.Metadata) (_ C.PacketConn, err error) {
-	// vless use stream-oriented udp with a special address, so we need a net.UDPAddr
+	if err = v.ResolveUDP(ctx, metadata); err != nil {
-	if !metadata.Resolved() {
+		return nil, err
-		ip, err := resolver.ResolveIP(ctx, metadata.Host)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
 
 	if v.option.XUDP {

adapter/outbound/vmess.go

@@ -17,7 +17,6 @@ import (
 	"github.com/metacubex/mihomo/component/dialer"
 	"github.com/metacubex/mihomo/component/ech"
 	"github.com/metacubex/mihomo/component/proxydialer"
-	"github.com/metacubex/mihomo/component/resolver"
 	tlsC "github.com/metacubex/mihomo/component/tls"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/ntp"
@@ -330,13 +329,8 @@ func (v *Vmess) DialContextWithDialer(ctx context.Context, dialer C.Dialer, meta
 
 // ListenPacketContext implements C.ProxyAdapter
 func (v *Vmess) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (_ C.PacketConn, err error) {
-	// vmess use stream-oriented udp with a special address, so we need a net.UDPAddr
+	if err = v.ResolveUDP(ctx, metadata); err != nil {
-	if !metadata.Resolved() {
+		return nil, err
-		ip, err := resolver.ResolveIP(ctx, metadata.Host)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
 	var c net.Conn
 	// gun transport
@@ -367,13 +361,8 @@ func (v *Vmess) ListenPacketWithDialer(ctx context.Context, dialer C.Dialer, met
 		}
 	}
 
-	// vmess use stream-oriented udp with a special address, so we need a net.UDPAddr
+	if err = v.ResolveUDP(ctx, metadata); err != nil {
-	if !metadata.Resolved() {
+		return nil, err
-		ip, err := resolver.ResolveIP(ctx, metadata.Host)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
 
 	c, err := dialer.DialContext(ctx, "tcp", v.addr)
@@ -413,13 +402,8 @@ func (v *Vmess) Close() error {
 
 // ListenPacketOnStreamConn implements C.ProxyAdapter
 func (v *Vmess) ListenPacketOnStreamConn(ctx context.Context, c net.Conn, metadata *C.Metadata) (_ C.PacketConn, err error) {
-	// vmess use stream-oriented udp with a special address, so we need a net.UDPAddr
+	if err = v.ResolveUDP(ctx, metadata); err != nil {
-	if !metadata.Resolved() {
+		return nil, err
-		ip, err := resolver.ResolveIP(ctx, metadata.Host)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
 
 	if pc, ok := c.(net.PacketConn); ok {

adapter/outbound/wireguard.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/base64"
 	"encoding/hex"
-	"errors"
 	"fmt"
 	"net"
 	"net/netip"
@@ -520,16 +519,8 @@ func (w *WireGuard) ListenPacketContext(ctx context.Context, metadata *C.Metadat
 	if err = w.init(ctx); err != nil {
 		return nil, err
 	}
-	if (!metadata.Resolved() || w.resolver != nil) && metadata.Host != "" {
+	if err = w.ResolveUDP(ctx, metadata); err != nil {
-		r := resolver.DefaultResolver
+		return nil, err
-		if w.resolver != nil {
-			r = w.resolver
-		}
-		ip, err := resolver.ResolveIPWithResolver(ctx, metadata.Host, r)
-		if err != nil {
-			return nil, errors.New("can't resolve ip")
-		}
-		metadata.DstIP = ip
 	}
 	pc, err = w.tunDevice.ListenPacket(ctx, M.SocksaddrFrom(metadata.DstIP, metadata.DstPort).Unwrap())
 	if err != nil {
@@ -541,6 +532,21 @@ func (w *WireGuard) ListenPacketContext(ctx context.Context, metadata *C.Metadat
 	return newPacketConn(pc, w), nil
 }
 
+func (w *WireGuard) ResolveUDP(ctx context.Context, metadata *C.Metadata) error {
+	if (!metadata.Resolved() || w.resolver != nil) && metadata.Host != "" {
+		r := resolver.DefaultResolver
+		if w.resolver != nil {
+			r = w.resolver
+		}
+		ip, err := resolver.ResolveIPWithResolver(ctx, metadata.Host, r)
+		if err != nil {
+			return fmt.Errorf("can't resolve ip: %w", err)
+		}
+		metadata.DstIP = ip
+	}
+	return nil
+}
+
 // IsL3Protocol implements C.ProxyAdapter
 func (w *WireGuard) IsL3Protocol(metadata *C.Metadata) bool {
 	return true

common/net/deadline/conn.go

@@ -20,7 +20,7 @@ type connReadResult struct {
 type Conn struct {
 	network.ExtendedConn
 	deadline     atomic.TypedValue[time.Time]
-	pipeDeadline pipeDeadline
+	pipeDeadline PipeDeadline
 	disablePipe  atomic.Bool
 	inRead       atomic.Bool
 	resultCh     chan *connReadResult
@@ -34,7 +34,7 @@ func IsConn(conn any) bool {
 func NewConn(conn net.Conn) *Conn {
 	c := &Conn{
 		ExtendedConn: bufio.NewExtendedConn(conn),
-		pipeDeadline: makePipeDeadline(),
+		pipeDeadline: MakePipeDeadline(),
 		resultCh:     make(chan *connReadResult, 1),
 	}
 	c.resultCh <- nil
@@ -58,7 +58,7 @@ func (c *Conn) Read(p []byte) (n int, err error) {
 			c.resultCh <- nil
 			break
 		}
-	case <-c.pipeDeadline.wait():
+	case <-c.pipeDeadline.Wait():
 		return 0, os.ErrDeadlineExceeded
 	}
 
@@ -104,7 +104,7 @@ func (c *Conn) ReadBuffer(buffer *buf.Buffer) (err error) {
 			c.resultCh <- nil
 			break
 		}
-	case <-c.pipeDeadline.wait():
+	case <-c.pipeDeadline.Wait():
 		return os.ErrDeadlineExceeded
 	}
 
@@ -130,7 +130,7 @@ func (c *Conn) SetReadDeadline(t time.Time) error {
 		return c.ExtendedConn.SetReadDeadline(t)
 	}
 	c.deadline.Store(t)
-	c.pipeDeadline.set(t)
+	c.pipeDeadline.Set(t)
 	return nil
 }
 

common/net/deadline/packet.go

@@ -19,7 +19,7 @@ type readResult struct {
 type NetPacketConn struct {
 	net.PacketConn
 	deadline     atomic.TypedValue[time.Time]
-	pipeDeadline pipeDeadline
+	pipeDeadline PipeDeadline
 	disablePipe  atomic.Bool
 	inRead       atomic.Bool
 	resultCh     chan any
@@ -28,7 +28,7 @@ type NetPacketConn struct {
 func NewNetPacketConn(pc net.PacketConn) net.PacketConn {
 	npc := &NetPacketConn{
 		PacketConn:   pc,
-		pipeDeadline: makePipeDeadline(),
+		pipeDeadline: MakePipeDeadline(),
 		resultCh:     make(chan any, 1),
 	}
 	npc.resultCh <- nil
@@ -83,7 +83,7 @@ FOR:
 				c.resultCh <- nil
 				break FOR
 			}
-		case <-c.pipeDeadline.wait():
+		case <-c.pipeDeadline.Wait():
 			return 0, nil, os.ErrDeadlineExceeded
 		}
 	}
@@ -122,7 +122,7 @@ func (c *NetPacketConn) SetReadDeadline(t time.Time) error {
 		return c.PacketConn.SetReadDeadline(t)
 	}
 	c.deadline.Store(t)
-	c.pipeDeadline.set(t)
+	c.pipeDeadline.Set(t)
 	return nil
 }
 

common/net/deadline/packet_enhance.go

@@ -52,7 +52,7 @@ FOR:
 				c.netPacketConn.resultCh <- nil
 				break FOR
 			}
-		case <-c.netPacketConn.pipeDeadline.wait():
+		case <-c.netPacketConn.pipeDeadline.Wait():
 			return nil, nil, nil, os.ErrDeadlineExceeded
 		}
 	}

common/net/deadline/packet_sing.go

@@ -69,7 +69,7 @@ FOR:
 				c.netPacketConn.resultCh <- nil
 				break FOR
 			}
-		case <-c.netPacketConn.pipeDeadline.wait():
+		case <-c.netPacketConn.pipeDeadline.Wait():
 			return M.Socksaddr{}, os.ErrDeadlineExceeded
 		}
 	}
@@ -146,7 +146,7 @@ FOR:
 				c.netPacketConn.resultCh <- nil
 				break FOR
 			}
-		case <-c.netPacketConn.pipeDeadline.wait():
+		case <-c.netPacketConn.pipeDeadline.Wait():
 			return nil, M.Socksaddr{}, os.ErrDeadlineExceeded
 		}
 	}

common/net/deadline/pipe.go

@@ -9,24 +9,24 @@ import (
 	"time"
 )
 
-// pipeDeadline is an abstraction for handling timeouts.
+// PipeDeadline is an abstraction for handling timeouts.
-type pipeDeadline struct {
+type PipeDeadline struct {
 	mu     sync.Mutex // Guards timer and cancel
 	timer  *time.Timer
 	cancel chan struct{} // Must be non-nil
 }
 
-func makePipeDeadline() pipeDeadline {
+func MakePipeDeadline() PipeDeadline {
-	return pipeDeadline{cancel: make(chan struct{})}
+	return PipeDeadline{cancel: make(chan struct{})}
 }
 
-// set sets the point in time when the deadline will time out.
+// Set sets the point in time when the deadline will time out.
 // A timeout event is signaled by closing the channel returned by waiter.
 // Once a timeout has occurred, the deadline can be refreshed by specifying a
 // t value in the future.
 //
 // A zero value for t prevents timeout.
-func (d *pipeDeadline) set(t time.Time) {
+func (d *PipeDeadline) Set(t time.Time) {
 	d.mu.Lock()
 	defer d.mu.Unlock()
 
@@ -61,8 +61,8 @@ func (d *pipeDeadline) set(t time.Time) {
 	}
 }
 
-// wait returns a channel that is closed when the deadline is exceeded.
+// Wait returns a channel that is closed when the deadline is exceeded.
-func (d *pipeDeadline) wait() chan struct{} {
+func (d *PipeDeadline) Wait() chan struct{} {
 	d.mu.Lock()
 	defer d.mu.Unlock()
 	return d.cancel

common/net/deadline/pipe_sing.go

@@ -33,8 +33,8 @@ type pipe struct {
 	localDone  chan struct{}
 	remoteDone <-chan struct{}
 
-	readDeadline  pipeDeadline
+	readDeadline  PipeDeadline
-	writeDeadline pipeDeadline
+	writeDeadline PipeDeadline
 
 	readWaitOptions N.ReadWaitOptions
 }
@@ -56,15 +56,15 @@ func Pipe() (net.Conn, net.Conn) {
 		rdRx: cb1, rdTx: cn1,
 		wrTx: cb2, wrRx: cn2,
 		localDone: done1, remoteDone: done2,
-		readDeadline:  makePipeDeadline(),
+		readDeadline:  MakePipeDeadline(),
-		writeDeadline: makePipeDeadline(),
+		writeDeadline: MakePipeDeadline(),
 	}
 	p2 := &pipe{
 		rdRx: cb2, rdTx: cn2,
 		wrTx: cb1, wrRx: cn1,
 		localDone: done2, remoteDone: done1,
-		readDeadline:  makePipeDeadline(),
+		readDeadline:  MakePipeDeadline(),
-		writeDeadline: makePipeDeadline(),
+		writeDeadline: MakePipeDeadline(),
 	}
 	return p1, p2
 }
@@ -86,7 +86,7 @@ func (p *pipe) read(b []byte) (n int, err error) {
 		return 0, io.ErrClosedPipe
 	case isClosedChan(p.remoteDone):
 		return 0, io.EOF
-	case isClosedChan(p.readDeadline.wait()):
+	case isClosedChan(p.readDeadline.Wait()):
 		return 0, os.ErrDeadlineExceeded
 	}
 
@@ -99,7 +99,7 @@ func (p *pipe) read(b []byte) (n int, err error) {
 		return 0, io.ErrClosedPipe
 	case <-p.remoteDone:
 		return 0, io.EOF
-	case <-p.readDeadline.wait():
+	case <-p.readDeadline.Wait():
 		return 0, os.ErrDeadlineExceeded
 	}
 }
@@ -118,7 +118,7 @@ func (p *pipe) write(b []byte) (n int, err error) {
 		return 0, io.ErrClosedPipe
 	case isClosedChan(p.remoteDone):
 		return 0, io.ErrClosedPipe
-	case isClosedChan(p.writeDeadline.wait()):
+	case isClosedChan(p.writeDeadline.Wait()):
 		return 0, os.ErrDeadlineExceeded
 	}
 
@@ -134,7 +134,7 @@ func (p *pipe) write(b []byte) (n int, err error) {
 			return n, io.ErrClosedPipe
 		case <-p.remoteDone:
 			return n, io.ErrClosedPipe
-		case <-p.writeDeadline.wait():
+		case <-p.writeDeadline.Wait():
 			return n, os.ErrDeadlineExceeded
 		}
 	}
@@ -145,8 +145,8 @@ func (p *pipe) SetDeadline(t time.Time) error {
 	if isClosedChan(p.localDone) || isClosedChan(p.remoteDone) {
 		return io.ErrClosedPipe
 	}
-	p.readDeadline.set(t)
+	p.readDeadline.Set(t)
-	p.writeDeadline.set(t)
+	p.writeDeadline.Set(t)
 	return nil
 }
 
@@ -154,7 +154,7 @@ func (p *pipe) SetReadDeadline(t time.Time) error {
 	if isClosedChan(p.localDone) || isClosedChan(p.remoteDone) {
 		return io.ErrClosedPipe
 	}
-	p.readDeadline.set(t)
+	p.readDeadline.Set(t)
 	return nil
 }
 
@@ -162,7 +162,7 @@ func (p *pipe) SetWriteDeadline(t time.Time) error {
 	if isClosedChan(p.localDone) || isClosedChan(p.remoteDone) {
 		return io.ErrClosedPipe
 	}
-	p.writeDeadline.set(t)
+	p.writeDeadline.Set(t)
 	return nil
 }
 
@@ -192,7 +192,7 @@ func (p *pipe) waitReadBuffer() (buffer *buf.Buffer, err error) {
 		return nil, io.ErrClosedPipe
 	case isClosedChan(p.remoteDone):
 		return nil, io.EOF
-	case isClosedChan(p.readDeadline.wait()):
+	case isClosedChan(p.readDeadline.Wait()):
 		return nil, os.ErrDeadlineExceeded
 	}
 	select {
@@ -211,7 +211,7 @@ func (p *pipe) waitReadBuffer() (buffer *buf.Buffer, err error) {
 		return nil, io.ErrClosedPipe
 	case <-p.remoteDone:
 		return nil, io.EOF
-	case <-p.readDeadline.wait():
+	case <-p.readDeadline.Wait():
 		return nil, os.ErrDeadlineExceeded
 	}
 }

common/net/listener.go

@@ -34,8 +34,8 @@ func (l *handleContextListener) init() {
 						}
 					}
 				}()
-				if c, err := l.handle(l.ctx, c); err == nil {
+				if conn, err := l.handle(l.ctx, c); err == nil {
-					l.conns <- c
+					l.conns <- conn
 				} else {
 					// handle failed, close the underlying connection.
 					_ = c.Close()

component/dialer/dialer.go

@@ -73,7 +73,7 @@ func ListenPacket(ctx context.Context, network, address string, rAddrPort netip.
 		}
 		if opt.interfaceName == "" {
 			if finder := DefaultInterfaceFinder.Load(); finder != nil {
-				opt.interfaceName = finder.FindInterfaceName(rAddrPort.Addr())
+				opt.interfaceName = finder.FindInterfaceName(rAddrPort.Addr().Unmap())
 			}
 		}
 		if rAddrPort.Addr().Unmap().IsLoopback() {

component/ech/ech.go

@@ -4,24 +4,20 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/metacubex/mihomo/component/resolver"
 	tlsC "github.com/metacubex/mihomo/component/tls"
 )
 
 type Config struct {
-	EncryptedClientHelloConfigList []byte
+	GetEncryptedClientHelloConfigList func(ctx context.Context, serverName string) ([]byte, error)
 }
 
 func (cfg *Config) ClientHandle(ctx context.Context, tlsConfig *tlsC.Config) (err error) {
 	if cfg == nil {
 		return nil
 	}
-	echConfigList := cfg.EncryptedClientHelloConfigList
+	echConfigList, err := cfg.GetEncryptedClientHelloConfigList(ctx, tlsConfig.ServerName)
-	if len(echConfigList) == 0 {
+	if err != nil {
-		echConfigList, err = resolver.ResolveECH(ctx, tlsConfig.ServerName)
+		return fmt.Errorf("resolve ECH config error: %w", err)
-		if err != nil {
-			return fmt.Errorf("resolve ECH config error: %w", err)
-		}
 	}
 
 	tlsConfig.EncryptedClientHelloConfigList = echConfigList

component/iface/iface.go

@@ -26,8 +26,9 @@ var (
 )
 
 type ifaceCache struct {
-	ifMap   map[string]*Interface
+	ifMapByName map[string]*Interface
-	ifTable bart.Table[*Interface]
+	ifMapByAddr map[netip.Addr]*Interface
+	ifTable     bart.Table[*Interface]
 }
 
 var caches = singledo.NewSingle[*ifaceCache](time.Second * 20)
@@ -40,7 +41,8 @@ func getCache() (*ifaceCache, error) {
 		}
 
 		cache := &ifaceCache{
-			ifMap: make(map[string]*Interface),
+			ifMapByName: make(map[string]*Interface),
+			ifMapByAddr: make(map[netip.Addr]*Interface),
 		}
 
 		for _, iface := range ifaces {
@@ -78,12 +80,13 @@ func getCache() (*ifaceCache, error) {
 				Flags:        iface.Flags,
 				Addresses:    ipNets,
 			}
-			cache.ifMap[iface.Name] = ifaceObj
+			cache.ifMapByName[iface.Name] = ifaceObj
 
 			if iface.Flags&net.FlagUp == 0 {
 				continue // interface down
 			}
 			for _, prefix := range ipNets {
+				cache.ifMapByAddr[prefix.Addr()] = ifaceObj
 				cache.ifTable.Insert(prefix, ifaceObj)
 			}
 		}
@@ -98,7 +101,7 @@ func Interfaces() (map[string]*Interface, error) {
 	if err != nil {
 		return nil, err
 	}
-	return cache.ifMap, nil
+	return cache.ifMapByName, nil
 }
 
 func ResolveInterface(name string) (*Interface, error) {
@@ -120,6 +123,11 @@ func ResolveInterfaceByAddr(addr netip.Addr) (*Interface, error) {
 	if err != nil {
 		return nil, err
 	}
+	// maybe two interfaces have the same prefix but different address
+	// so direct check address equal before do a route lookup (longest prefix match)
+	if iface, ok := cache.ifMapByAddr[addr]; ok {
+		return iface, nil
+	}
 	iface, ok := cache.ifTable.Lookup(addr)
 	if !ok {
 		return nil, ErrIfaceNotFound
@@ -133,7 +141,8 @@ func IsLocalIp(addr netip.Addr) (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	return cache.ifTable.Contains(addr), nil
+	_, ok := cache.ifMapByAddr[addr]
+	return ok, nil
 }
 
 func FlushCache() {

component/proxydialer/proxydialer.go

@@ -2,7 +2,6 @@ package proxydialer
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"net"
 	"net/netip"
@@ -10,7 +9,6 @@ import (
 
 	N "github.com/metacubex/mihomo/common/net"
 	"github.com/metacubex/mihomo/component/dialer"
-	"github.com/metacubex/mihomo/component/resolver"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/tunnel"
 	"github.com/metacubex/mihomo/tunnel/statistic"
@@ -40,17 +38,16 @@ func (p proxyDialer) DialContext(ctx context.Context, network, address string) (
 		return nil, err
 	}
 	if strings.Contains(network, "udp") { // using in wireguard outbound
-		if !currentMeta.Resolved() {
-			ip, err := resolver.ResolveIP(ctx, currentMeta.Host)
-			if err != nil {
-				return nil, errors.New("can't resolve ip")
-			}
-			currentMeta.DstIP = ip
-		}
 		pc, err := p.listenPacket(ctx, currentMeta)
 		if err != nil {
 			return nil, err
 		}
+		if !currentMeta.Resolved() { // should not happen, maybe by a wrongly implemented proxy, but we can handle this (:
+			err = pc.ResolveUDP(ctx, currentMeta)
+			if err != nil {
+				return nil, err
+			}
+		}
 		return N.NewBindPacketConn(pc, currentMeta.UDPAddr()), nil
 	}
 	var conn C.Conn

component/resolver/host.go

@@ -77,7 +77,7 @@ func NewHostValue(value any) (HostValue, error) {
 			isDomain = false
 			for _, str := range valueArr {
 				if ip, err := netip.ParseAddr(str); err == nil {
-					ips = append(ips, ip)
+					ips = append(ips, ip.Unmap())
 				} else {
 					return HostValue{}, err
 				}
@@ -85,7 +85,7 @@ func NewHostValue(value any) (HostValue, error) {
 		} else if len(valueArr) == 1 {
 			host := valueArr[0]
 			if ip, err := netip.ParseAddr(host); err == nil {
-				ips = append(ips, ip)
+				ips = append(ips, ip.Unmap())
 				isDomain = false
 			} else {
 				domain = host

component/resolver/resolver.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"net/netip"
-	"strings"
 	"time"
 
 	"github.com/metacubex/mihomo/common/utils"
@@ -68,7 +67,8 @@ func LookupIPv4WithResolver(ctx context.Context, host string, r Resolver) ([]net
 
 	ip, err := netip.ParseAddr(host)
 	if err == nil {
-		if ip.Is4() || ip.Is4In6() {
+		ip = ip.Unmap()
+		if ip.Is4() {
 			return []netip.Addr{ip}, nil
 		}
 		return []netip.Addr{}, ErrIPVersion
@@ -117,7 +117,8 @@ func LookupIPv6WithResolver(ctx context.Context, host string, r Resolver) ([]net
 	}
 
 	if ip, err := netip.ParseAddr(host); err == nil {
-		if strings.Contains(host, ":") {
+		ip = ip.Unmap()
+		if ip.Is6() {
 			return []netip.Addr{ip}, nil
 		}
 		return nil, ErrIPVersion
@@ -166,6 +167,7 @@ func LookupIPWithResolver(ctx context.Context, host string, r Resolver) ([]netip
 	}
 
 	if ip, err := netip.ParseAddr(host); err == nil {
+		ip = ip.Unmap()
 		return []netip.Addr{ip}, nil
 	}
 

component/sniffer/dispatcher.go

@@ -72,8 +72,16 @@ func (sd *Dispatcher) UDPSniff(packet C.PacketAdapter, packetSender C.PacketSend
 				overrideDest := config.OverrideDest
 
 				if inWhitelist {
+					replaceDomain := func(metadata *C.Metadata, host string) {
+						if sd.domainCanReplace(host) {
+							replaceDomain(metadata, host, overrideDest)
+						} else {
+							log.Debugln("[Sniffer] Skip sni[%s]", host)
+						}
+					}
+
 					if wrapable, ok := current.(sniffer.MultiPacketSniffer); ok {
-						return wrapable.WrapperSender(packetSender, overrideDest)
+						return wrapable.WrapperSender(packetSender, replaceDomain)
 					}
 
 					host, err := current.SniffData(packet.Data())
@@ -81,7 +89,7 @@ func (sd *Dispatcher) UDPSniff(packet C.PacketAdapter, packetSender C.PacketSend
 						continue
 					}
 
-					replaceDomain(metadata, host, overrideDest)
+					replaceDomain(metadata, host)
 					return packetSender
 				}
 			}
@@ -128,11 +136,9 @@ func (sd *Dispatcher) TCPSniff(conn *N.BufferedConn, metadata *C.Metadata) bool
 			return false
 		}
 
-		for _, matcher := range sd.skipDomain {
+		if !sd.domainCanReplace(host) {
-			if matcher.MatchDomain(host) {
+			log.Debugln("[Sniffer] Skip sni[%s]", host)
-				log.Debugln("[Sniffer] Skip sni[%s]", host)
+			return false
-				return false
-			}
 		}
 
 		sd.skipList.Delete(dst)
@@ -152,10 +158,20 @@ func replaceDomain(metadata *C.Metadata, host string, overrideDest bool) {
 			metadata.RemoteAddress(),
 			metadata.Host, host)
 		metadata.Host = host
+		metadata.DstIP = netip.Addr{}
 	}
 	metadata.DNSMode = C.DNSNormal
 }
 
+func (sd *Dispatcher) domainCanReplace(host string) bool {
+	for _, matcher := range sd.skipDomain {
+		if matcher.MatchDomain(host) {
+			return false
+		}
+	}
+	return true
+}
+
 func (sd *Dispatcher) Enable() bool {
 	return sd != nil && sd.enable
 }

component/sniffer/quic_sniffer.go

@@ -74,24 +74,25 @@ func (sniffer *QuicSniffer) SniffData(b []byte) (string, error) {
 	return "", ErrorUnsupportedSniffer
 }
 
-func (sniffer *QuicSniffer) WrapperSender(packetSender constant.PacketSender, override bool) constant.PacketSender {
+func (sniffer *QuicSniffer) WrapperSender(packetSender constant.PacketSender, replaceDomain sniffer.ReplaceDomain) constant.PacketSender {
 	return &quicPacketSender{
-		sender:   packetSender,
+		PacketSender:  packetSender,
-		chClose:  make(chan struct{}),
+		replaceDomain: replaceDomain,
-		override: override,
+		chClose:       make(chan struct{}),
 	}
 }
 
 var _ constant.PacketSender = (*quicPacketSender)(nil)
 
 type quicPacketSender struct {
-	lock     sync.RWMutex
+	lock   sync.RWMutex
-	ranges   utils.IntRanges[uint64]
+	ranges utils.IntRanges[uint64]
-	buffer   []byte
+	buffer []byte
-	result   string
+	result *string
-	override bool
 
-	sender constant.PacketSender
+	replaceDomain sniffer.ReplaceDomain
+
+	constant.PacketSender
 
 	chClose chan struct{}
 	closed  bool
@@ -100,7 +101,7 @@ type quicPacketSender struct {
 // Send will send PacketAdapter nonblocking
 // the implement must call UDPPacket.Drop() inside Send
 func (q *quicPacketSender) Send(current constant.PacketAdapter) {
-	defer q.sender.Send(current)
+	defer q.PacketSender.Send(current)
 
 	q.lock.RLock()
 	if q.closed {
@@ -116,29 +117,27 @@ func (q *quicPacketSender) Send(current constant.PacketAdapter) {
 	}
 }
 
-// Process is a blocking loop to send PacketAdapter to PacketConn and update the WriteBackProxy
+// DoSniff wait sniffer recv all fragments and update the domain
-func (q *quicPacketSender) Process(conn constant.PacketConn, proxy constant.WriteBackProxy) {
+func (q *quicPacketSender) DoSniff(metadata *constant.Metadata) error {
-	q.sender.Process(conn, proxy)
-}
-
-// ResolveUDP wait sniffer recv all fragments and update the domain
-func (q *quicPacketSender) ResolveUDP(data *constant.Metadata) error {
 	select {
 	case <-q.chClose:
 		q.lock.RLock()
-		replaceDomain(data, q.result, q.override)
+		if q.result != nil {
+			host := *q.result
+			q.replaceDomain(metadata, host)
+		}
 		q.lock.RUnlock()
 		break
 	case <-time.After(quicWaitConn):
 		q.close()
 	}
 
-	return q.sender.ResolveUDP(data)
+	return q.PacketSender.DoSniff(metadata)
 }
 
 // Close stop the Process loop
 func (q *quicPacketSender) Close() {
-	q.sender.Close()
+	q.PacketSender.Close()
 	q.close()
 }
 
@@ -433,7 +432,7 @@ func (q *quicPacketSender) tryAssemble() error {
 	}
 
 	q.lock.Lock()
-	q.result = *domain
+	q.result = domain
 	q.closeLocked()
 	q.lock.Unlock()
 

component/sniffer/sniff_test.go

@@ -12,7 +12,7 @@ import (
 )
 
 type fakeSender struct {
-	resultCh chan *constant.Metadata
+	constant.PacketSender
 }
 
 var _ constant.PacketSender = (*fakeSender)(nil)
@@ -22,18 +22,7 @@ func (e *fakeSender) Send(packet constant.PacketAdapter) {
 	packet.Drop()
 }
 
-func (e *fakeSender) Process(constant.PacketConn, constant.WriteBackProxy) {
+func (e *fakeSender) DoSniff(metadata *constant.Metadata) error { return nil }
-	panic("not implemented")
-}
-
-func (e *fakeSender) ResolveUDP(metadata *constant.Metadata) error {
-	e.resultCh <- metadata
-	return nil
-}
-
-func (e *fakeSender) Close() {
-	panic("not implemented")
-}
 
 type fakeUDPPacket struct {
 	data  []byte
@@ -78,23 +67,28 @@ func asPacket(data string) constant.PacketAdapter {
 	return pktAdp
 }
 
-func testQuicSniffer(data []string, async bool) (string, error) {
+const fakeHost = "fake.host.com"
+
+func testQuicSniffer(data []string, async bool) (string, string, error) {
 	q, err := NewQuicSniffer(SnifferConfig{})
 	if err != nil {
-		return "", err
+		return "", "", err
 	}
 
 	resultCh := make(chan *constant.Metadata, 1)
-	emptySender := &fakeSender{resultCh: resultCh}
+	emptySender := &fakeSender{}
 
-	sender := q.WrapperSender(emptySender, true)
+	sender := q.WrapperSender(emptySender, func(metadata *constant.Metadata, host string) {
+		replaceDomain(metadata, host, true)
+	})
 
 	go func() {
-		meta := constant.Metadata{}
+		meta := constant.Metadata{Host: fakeHost}
-		err = sender.ResolveUDP(&meta)
+		err := sender.DoSniff(&meta)
 		if err != nil {
 			panic(err)
 		}
+		resultCh <- &meta
 	}()
 
 	for _, d := range data {
@@ -106,14 +100,15 @@ func testQuicSniffer(data []string, async bool) (string, error) {
 	}
 
 	meta := <-resultCh
-	return meta.SniffHost, nil
+	return meta.SniffHost, meta.Host, nil
 }
 
 func TestQuicHeaders(t *testing.T) {
 
 	cases := []struct {
-		input  []string
+		input   []string
-		domain string
+		domain  string
+		invalid bool
 	}{
 		//Normal domain quic sniff
 		{
@@ -171,16 +166,31 @@ func TestQuicHeaders(t *testing.T) {
 			},
 			domain: "www.google.com",
 		},
+		// invalid packet
+		{
+			input:   []string{"00000000000000000000"},
+			invalid: true,
+		},
 	}
 
 	for _, test := range cases {
-		data, err := testQuicSniffer(test.input, true)
+		data, host, err := testQuicSniffer(test.input, true)
 		assert.NoError(t, err)
 		assert.Equal(t, test.domain, data)
+		if test.invalid {
+			assert.Equal(t, fakeHost, host)
+		} else {
+			assert.Equal(t, test.domain, host)
+		}
 
-		data, err = testQuicSniffer(test.input, false)
+		data, host, err = testQuicSniffer(test.input, false)
 		assert.NoError(t, err)
 		assert.Equal(t, test.domain, data)
+		if test.invalid {
+			assert.Equal(t, fakeHost, host)
+		} else {
+			assert.Equal(t, test.domain, host)
+		}
 	}
 }
 

component/tls/httpserver.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"net"
 	"net/http"
+	"runtime/debug"
 	"time"
 
 	N "github.com/metacubex/mihomo/common/net"
@@ -63,6 +64,7 @@ func NewListenerForHttps(l net.Listener, httpServer *http.Server, tlsConfig *Con
 		}
 		return c, nil
 	}, func(a any) {
-		log.Errorln("https server panic: %s", a)
+		stack := debug.Stack()
+		log.Errorln("https server panic: %s\n%s", a, stack)
 	})
 }

constant/adapters.go

@@ -92,8 +92,7 @@ type Conn interface {
 type PacketConn interface {
 	N.EnhancePacketConn
 	Connection
-	// Deprecate WriteWithMetadata because of remote resolve DNS cause TURN failed
+	ResolveUDP(ctx context.Context, metadata *Metadata) error
-	// WriteWithMetadata(p []byte, metadata *Metadata) (n int, err error)
 }
 
 type Dialer interface {
@@ -319,10 +318,15 @@ type PacketSender interface {
 	Send(PacketAdapter)
 	// Process is a blocking loop to send PacketAdapter to PacketConn and update the WriteBackProxy
 	Process(PacketConn, WriteBackProxy)
-	// ResolveUDP do a local resolve UDP dns blocking if metadata is not resolved
-	ResolveUDP(*Metadata) error
 	// Close stop the Process loop
 	Close()
+	// DoSniff will blocking after sniffer work done
+	DoSniff(*Metadata) error
+	// AddMapping add a destination NAT record
+	AddMapping(originMetadata *Metadata, metadata *Metadata)
+	// RestoreReadFrom restore destination NAT for ReadFrom
+	// the implement must ensure returned netip.Add is valid (or just return input addr)
+	RestoreReadFrom(addr netip.Addr) netip.Addr
 }
 
 type NatTable interface {

constant/metadata.go

@@ -261,6 +261,11 @@ func (m *Metadata) Pure() *Metadata {
 	return m
 }
 
+func (m *Metadata) Clone() *Metadata {
+	copyM := *m
+	return &copyM
+}
+
 func (m *Metadata) AddrPort() netip.AddrPort {
 	return netip.AddrPortFrom(m.DstIP.Unmap(), m.DstPort)
 }

constant/sniffer/sniffer.go

@@ -10,8 +10,10 @@ type Sniffer interface {
 	SupportPort(port uint16) bool
 }
 
+type ReplaceDomain func(metadata *constant.Metadata, host string)
+
 type MultiPacketSniffer interface {
-	WrapperSender(packetSender constant.PacketSender, override bool) constant.PacketSender
+	WrapperSender(packetSender constant.PacketSender, replaceDomain ReplaceDomain) constant.PacketSender
 }
 
 const (

dns/resolver.go

@@ -348,7 +348,8 @@ func (r *Resolver) ipExchange(ctx context.Context, m *D.Msg) (msg *D.Msg, err er
 func (r *Resolver) lookupIP(ctx context.Context, host string, dnsType uint16) (ips []netip.Addr, err error) {
 	ip, err := netip.ParseAddr(host)
 	if err == nil {
-		isIPv4 := ip.Is4() || ip.Is4In6()
+		ip = ip.Unmap()
+		isIPv4 := ip.Is4()
 		if dnsType == D.TypeAAAA && !isIPv4 {
 			return []netip.Addr{ip}, nil
 		} else if dnsType == D.TypeA && isIPv4 {

go.mod

@@ -23,16 +23,16 @@ require (
 	github.com/metacubex/chacha v0.1.2
 	github.com/metacubex/fswatch v0.1.1
 	github.com/metacubex/gopacket v1.1.20-0.20230608035415-7e2f98a3e759
-	github.com/metacubex/quic-go v0.51.1-0.20250511032541-4e34341cf18b
+	github.com/metacubex/quic-go v0.52.1-0.20250522021943-aef454b9e639
 	github.com/metacubex/randv2 v0.2.0
-	github.com/metacubex/sing v0.5.3-0.20250504031621-1f99e54c15b7
+	github.com/metacubex/sing v0.5.3
 	github.com/metacubex/sing-mux v0.3.2
-	github.com/metacubex/sing-quic v0.0.0-20250520025433-6e556a6bef7a
+	github.com/metacubex/sing-quic v0.0.0-20250523120938-f1a248e5ec7f
-	github.com/metacubex/sing-shadowsocks v0.2.9
+	github.com/metacubex/sing-shadowsocks v0.2.10
-	github.com/metacubex/sing-shadowsocks2 v0.2.3
+	github.com/metacubex/sing-shadowsocks2 v0.2.4
 	github.com/metacubex/sing-shadowtls v0.0.0-20250503063515-5d9f966d17a2
-	github.com/metacubex/sing-tun v0.4.6-0.20250503065609-efb9f0beb6f6
+	github.com/metacubex/sing-tun v0.4.6-0.20250524142129-9d110c0af70c
-	github.com/metacubex/sing-vmess v0.2.1
+	github.com/metacubex/sing-vmess v0.2.2
 	github.com/metacubex/sing-wireguard v0.0.0-20250503063753-2dc62acc626f
 	github.com/metacubex/smux v0.0.0-20250503055512-501391591dee
 	github.com/metacubex/tfo-go v0.0.0-20250516165257-e29c16ae41d4

go.sum

@@ -111,27 +111,27 @@ github.com/metacubex/gvisor v0.0.0-20250324165734-5857f47bd43b h1:RUh4OdVPz/jDrM
 github.com/metacubex/gvisor v0.0.0-20250324165734-5857f47bd43b/go.mod h1:8LpS0IJW1VmWzUm3ylb0e2SK5QDm5lO/2qwWLZgRpBU=
 github.com/metacubex/nftables v0.0.0-20250503052935-30a69ab87793 h1:1Qpuy+sU3DmyX9HwI+CrBT/oLNJngvBorR2RbajJcqo=
 github.com/metacubex/nftables v0.0.0-20250503052935-30a69ab87793/go.mod h1:RjRNb4G52yAgfR+Oe/kp9G4PJJ97Fnj89eY1BFO3YyA=
-github.com/metacubex/quic-go v0.51.1-0.20250511032541-4e34341cf18b h1:8oDU32eJ+RRhl1FodGgPfxQxtoBAiD9D40XG2XtU/SE=
+github.com/metacubex/quic-go v0.52.1-0.20250522021943-aef454b9e639 h1:L+1brQNzBhCCxWlicwfK1TlceemCRmrDE4HmcVHc29w=
-github.com/metacubex/quic-go v0.51.1-0.20250511032541-4e34341cf18b/go.mod h1:9R1NOzCgTcWsdWvOMlmtMuF0uKzuOpsfvEf7U3I8zM0=
+github.com/metacubex/quic-go v0.52.1-0.20250522021943-aef454b9e639/go.mod h1:Kc6h++Q/zf3AxcUCevJhJwgrskJumv+pZdR8g/E/10k=
 github.com/metacubex/randv2 v0.2.0 h1:uP38uBvV2SxYfLj53kuvAjbND4RUDfFJjwr4UigMiLs=
 github.com/metacubex/randv2 v0.2.0/go.mod h1:kFi2SzrQ5WuneuoLLCMkABtiBu6VRrMrWFqSPyj2cxY=
 github.com/metacubex/sing v0.5.2/go.mod h1:ypf0mjwlZm0sKdQSY+yQvmsbWa0hNPtkeqyRMGgoN+w=
-github.com/metacubex/sing v0.5.3-0.20250504031621-1f99e54c15b7 h1:m4nSxvw46JEgxMzzmnXams+ebwabcry4Ydep/zNiesQ=
+github.com/metacubex/sing v0.5.3 h1:QWdN16WFKMk06x4nzkc8SvZ7y2x+TLQrpkPoHs+WSVM=
-github.com/metacubex/sing v0.5.3-0.20250504031621-1f99e54c15b7/go.mod h1:ypf0mjwlZm0sKdQSY+yQvmsbWa0hNPtkeqyRMGgoN+w=
+github.com/metacubex/sing v0.5.3/go.mod h1:ypf0mjwlZm0sKdQSY+yQvmsbWa0hNPtkeqyRMGgoN+w=
 github.com/metacubex/sing-mux v0.3.2 h1:nJv52pyRivHcaZJKk2JgxpaVvj1GAXG81scSa9N7ncw=
 github.com/metacubex/sing-mux v0.3.2/go.mod h1:3rt1soewn0O6j89GCLmwAQFsq257u0jf2zQSPhTL3Bw=
-github.com/metacubex/sing-quic v0.0.0-20250520025433-6e556a6bef7a h1:Ho73vGiB94LmtK5T+tKVwtCNEi/YiHmPjlqpHSAmAVs=
+github.com/metacubex/sing-quic v0.0.0-20250523120938-f1a248e5ec7f h1:mP3vIm+9hRFI0C0Vl3pE0NESF/L85FDbuB0tGgUii6I=
-github.com/metacubex/sing-quic v0.0.0-20250520025433-6e556a6bef7a/go.mod h1:JPTpf7fpnojsSuwRJExhSZSy63pVbp3VM39+zj+sAJM=
+github.com/metacubex/sing-quic v0.0.0-20250523120938-f1a248e5ec7f/go.mod h1:JPTpf7fpnojsSuwRJExhSZSy63pVbp3VM39+zj+sAJM=
-github.com/metacubex/sing-shadowsocks v0.2.9 h1:2e++13WNN7EGjGtvrGLUzW1xrCdQbW2gIFpgw5GEw00=
+github.com/metacubex/sing-shadowsocks v0.2.10 h1:Pr7LDbjMANIQHl07zWgl1vDuhpsfDQUpZ8cX6DPabfg=
-github.com/metacubex/sing-shadowsocks v0.2.9/go.mod h1:CJSEGO4FWQAWe+ZiLZxCweGdjRR60A61SIoVjdjQeBA=
+github.com/metacubex/sing-shadowsocks v0.2.10/go.mod h1:MtRM0ZZjR0kaDOzy9zWSt6/4/UlrnsNBq+1FNAF4vBk=
-github.com/metacubex/sing-shadowsocks2 v0.2.3 h1:v3rNS/5Ywh0NIZ6VU/NmdERQIN5RePzyxCFeQsU4Cx0=
+github.com/metacubex/sing-shadowsocks2 v0.2.4 h1:Ec0x3hHR7xkld5Z09IGh16wtUUpBb2HgqZ9DExd8Q7s=
-github.com/metacubex/sing-shadowsocks2 v0.2.3/go.mod h1:/WNy/Q8ahLCoPRriWuFZFD0Jy+JNp1MEQl28Zw6SaF8=
+github.com/metacubex/sing-shadowsocks2 v0.2.4/go.mod h1:WP8+S0kqtnSbX1vlIpo5i8Irm/ijZITEPBcZ26B5unY=
 github.com/metacubex/sing-shadowtls v0.0.0-20250503063515-5d9f966d17a2 h1:gXU+MYPm7Wme3/OAY2FFzVq9d9GxPHOqu5AQfg/ddhI=
 github.com/metacubex/sing-shadowtls v0.0.0-20250503063515-5d9f966d17a2/go.mod h1:mbfboaXauKJNIHJYxQRa+NJs4JU9NZfkA+I33dS2+9E=
-github.com/metacubex/sing-tun v0.4.6-0.20250503065609-efb9f0beb6f6 h1:TAwL91XPa6x1QK55CRm+VTzPvLPUfEr/uFDnOZArqEU=
+github.com/metacubex/sing-tun v0.4.6-0.20250524142129-9d110c0af70c h1:Y6jk7AH5BEg9Dsvczrf/KokYsvxeKSZZlCLHg+hC4ro=
-github.com/metacubex/sing-tun v0.4.6-0.20250503065609-efb9f0beb6f6/go.mod h1:HDaHDL6onAX2ZGbAGUXKp++PohRdNb7Nzt6zxzhox+U=
+github.com/metacubex/sing-tun v0.4.6-0.20250524142129-9d110c0af70c/go.mod h1:HDaHDL6onAX2ZGbAGUXKp++PohRdNb7Nzt6zxzhox+U=
-github.com/metacubex/sing-vmess v0.2.1 h1:I6gM3VUjtvJ15D805EUbNH+SRBuqzJeFnuIbKYUsWZ0=
+github.com/metacubex/sing-vmess v0.2.2 h1:nG6GIKF1UOGmlzs+BIetdGHkFZ20YqFVIYp5Htqzp+4=
-github.com/metacubex/sing-vmess v0.2.1/go.mod h1:DsODWItJtOMZNna8Qhheg8r3tUivrcO3vWgaTYKnfTo=
+github.com/metacubex/sing-vmess v0.2.2/go.mod h1:CVDNcdSLVYFgTHQlubr88d8CdqupAUDqLjROos+H9xk=
 github.com/metacubex/sing-wireguard v0.0.0-20250503063753-2dc62acc626f h1:Sr/DYKYofKHKc4GF3qkRGNuj6XA6c0eqPgEDN+VAsYU=
 github.com/metacubex/sing-wireguard v0.0.0-20250503063753-2dc62acc626f/go.mod h1:jpAkVLPnCpGSfNyVmj6Cq4YbuZsFepm/Dc+9BAOcR80=
 github.com/metacubex/smux v0.0.0-20250503055512-501391591dee h1:lp6hJ+4wCLZu113awp7P6odM2okB5s60HUyF0FMqKmo=

listener/reality/reality.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"runtime/debug"
 	"time"
 
 	N "github.com/metacubex/mihomo/common/net"
@@ -89,7 +90,8 @@ func (b Builder) NewListener(l net.Listener) net.Listener {
 		// We fixed it by calling Close() directly.
 		return realityConnWrapper{c}, nil
 	}, func(a any) {
-		log.Errorln("reality server panic: %s", a)
+		stack := debug.Stack()
+		log.Errorln("reality server panic: %s\n%s", a, stack)
 	})
 }
 

listener/sing/context.go

@@ -3,6 +3,7 @@ package sing
 import (
 	"context"
 	"golang.org/x/exp/slices"
+	"net"
 
 	"github.com/metacubex/mihomo/adapter/inbound"
 
@@ -29,3 +30,18 @@ func getAdditions(ctx context.Context) (additions []inbound.Addition) {
 	}
 	return
 }
+
+var ctxKeyInAddr = contextKey("InAddr")
+
+func WithInAddr(ctx context.Context, inAddr net.Addr) context.Context {
+	return context.WithValue(ctx, ctxKeyInAddr, inAddr)
+}
+
+func getInAddr(ctx context.Context) net.Addr {
+	if v := ctx.Value(ctxKeyInAddr); v != nil {
+		if a, ok := v.(net.Addr); ok {
+			return a
+		}
+	}
+	return nil
+}

listener/sing/sing.go

@@ -16,6 +16,7 @@ import (
 
 	mux "github.com/metacubex/sing-mux"
 	vmess "github.com/metacubex/sing-vmess"
+	"github.com/metacubex/sing/common"
 	"github.com/metacubex/sing/common/buf"
 	"github.com/metacubex/sing/common/bufio"
 	"github.com/metacubex/sing/common/bufio/deadline"
@@ -146,11 +147,11 @@ func (h *ListenerHandler) NewConnection(ctx context.Context, conn net.Conn, meta
 func (h *ListenerHandler) NewPacketConnection(ctx context.Context, conn network.PacketConn, metadata M.Metadata) error {
 	defer func() { _ = conn.Close() }()
 	mutex := sync.Mutex{}
-	conn2 := bufio.NewNetPacketConn(conn) // a new interface to set nil in defer
+	writer := bufio.NewNetPacketWriter(conn) // a new interface to set nil in defer
 	defer func() {
 		mutex.Lock() // this goroutine must exit after all conn.WritePacket() is not running
 		defer mutex.Unlock()
-		conn2 = nil
+		writer = nil
 	}()
 	rwOptions := network.ReadWaitOptions{}
 	readWaiter, isReadWaiter := bufio.CreatePacketReadWaiter(conn)
@@ -180,32 +181,59 @@ func (h *ListenerHandler) NewPacketConnection(ctx context.Context, conn network.
 			return err
 		}
 		cPacket := &packet{
-			conn:  &conn2,
+			writer: &writer,
-			mutex: &mutex,
+			mutex:  &mutex,
-			rAddr: metadata.Source.UDPAddr(),
+			rAddr:  metadata.Source.UDPAddr(),
-			lAddr: conn.LocalAddr(),
+			lAddr:  conn.LocalAddr(),
-			buff:  buff,
+			buff:   buff,
 		}
-
+		if lAddr := getInAddr(ctx); lAddr != nil {
-		cMetadata := &C.Metadata{
+			cPacket.lAddr = lAddr
-			NetWork: C.UDP,
-			Type:    h.Type,
 		}
-		if metadata.Source.IsIP() && metadata.Source.Fqdn == "" {
+		h.handlePacket(ctx, cPacket, metadata.Source, dest)
-			cMetadata.RawSrcAddr = metadata.Source.Unwrap().UDPAddr()
-		}
-		if dest.IsIP() && dest.Fqdn == "" {
-			cMetadata.RawDstAddr = dest.Unwrap().UDPAddr()
-		}
-		inbound.ApplyAdditions(cMetadata, inbound.WithDstAddr(dest), inbound.WithSrcAddr(metadata.Source), inbound.WithInAddr(conn.LocalAddr()))
-		inbound.ApplyAdditions(cMetadata, h.Additions...)
-		inbound.ApplyAdditions(cMetadata, getAdditions(ctx)...)
-
-		h.Tunnel.HandleUDPPacket(cPacket, cMetadata)
 	}
 	return nil
 }
 
+type localAddr interface {
+	LocalAddr() net.Addr
+}
+
+func (h *ListenerHandler) NewPacket(ctx context.Context, key netip.AddrPort, buffer *buf.Buffer, metadata M.Metadata, init func(natConn network.PacketConn) network.PacketWriter) {
+	writer := bufio.NewNetPacketWriter(init(nil))
+	mutex := sync.Mutex{}
+	cPacket := &packet{
+		writer: &writer,
+		mutex:  &mutex,
+		rAddr:  metadata.Source.UDPAddr(),
+		buff:   buffer,
+	}
+	if conn, ok := common.Cast[localAddr](writer); ok {
+		cPacket.rAddr = conn.LocalAddr()
+	} else {
+		cPacket.rAddr = metadata.Source.UDPAddr() // tun does not have real inAddr
+	}
+	h.handlePacket(ctx, cPacket, metadata.Source, metadata.Destination)
+}
+
+func (h *ListenerHandler) handlePacket(ctx context.Context, cPacket *packet, source M.Socksaddr, destination M.Socksaddr) {
+	cMetadata := &C.Metadata{
+		NetWork: C.UDP,
+		Type:    h.Type,
+	}
+	if source.IsIP() && source.Fqdn == "" {
+		cMetadata.RawSrcAddr = source.Unwrap().UDPAddr()
+	}
+	if destination.IsIP() && destination.Fqdn == "" {
+		cMetadata.RawDstAddr = destination.Unwrap().UDPAddr()
+	}
+	inbound.ApplyAdditions(cMetadata, inbound.WithDstAddr(destination), inbound.WithSrcAddr(source), inbound.WithInAddr(cPacket.InAddr()))
+	inbound.ApplyAdditions(cMetadata, h.Additions...)
+	inbound.ApplyAdditions(cMetadata, getAdditions(ctx)...)
+
+	h.Tunnel.HandleUDPPacket(cPacket, cMetadata)
+}
+
 func (h *ListenerHandler) NewError(ctx context.Context, err error) {
 	log.Warnln("%s listener get error: %+v", h.Type.String(), err)
 }
@@ -225,11 +253,11 @@ func ShouldIgnorePacketError(err error) bool {
 }
 
 type packet struct {
-	conn  *network.NetPacketConn
+	writer *network.NetPacketWriter
-	mutex *sync.Mutex
+	mutex  *sync.Mutex
-	rAddr net.Addr
+	rAddr  net.Addr
-	lAddr net.Addr
+	lAddr  net.Addr
-	buff  *buf.Buffer
+	buff   *buf.Buffer
 }
 
 func (c *packet) Data() []byte {
@@ -245,7 +273,7 @@ func (c *packet) WriteBack(b []byte, addr net.Addr) (n int, err error) {
 
 	c.mutex.Lock()
 	defer c.mutex.Unlock()
-	conn := *c.conn
+	conn := *c.writer
 	if conn == nil {
 		err = errors.New("writeBack to closed connection")
 		return

listener/sing_shadowsocks/server.go

@@ -156,11 +156,7 @@ func New(config LC.ShadowsocksServer, tunnel C.Tunnel, additions ...inbound.Addi
 
 			go func() {
 				conn := bufio.NewPacketConn(ul)
-				rwOptions := network.ReadWaitOptions{
+				rwOptions := network.NewReadWaitOptions(conn, sl.service)
-					FrontHeadroom: network.CalculateFrontHeadroom(sl.service),
-					RearHeadroom:  network.CalculateRearHeadroom(sl.service),
-					MTU:           network.CalculateMTU(conn, sl.service),
-				}
 				readWaiter, isReadWaiter := bufio.CreatePacketReadWaiter(conn)
 				if isReadWaiter {
 					readWaiter.InitializeReadWaiter(rwOptions)
@@ -188,7 +184,9 @@ func New(config LC.ShadowsocksServer, tunnel C.Tunnel, additions ...inbound.Addi
 						}
 						continue
 					}
-					_ = sl.service.NewPacket(context.TODO(), conn, buff, M.Metadata{
+					ctx := context.TODO()
+					ctx = sing.WithInAddr(ctx, ul.LocalAddr())
+					_ = sl.service.NewPacket(ctx, conn, buff, M.Metadata{
 						Protocol: "shadowsocks",
 						Source:   dest,
 					})

listener/sing_tun/dns.go

@@ -43,16 +43,31 @@ func (h *ListenerHandler) NewConnection(ctx context.Context, conn net.Conn, meta
 	return h.ListenerHandler.NewConnection(ctx, conn, metadata)
 }
 
+func (h *ListenerHandler) NewPacket(ctx context.Context, key netip.AddrPort, buffer *buf.Buffer, metadata M.Metadata, init func(natConn network.PacketConn) network.PacketWriter) {
+	if h.ShouldHijackDns(metadata.Destination.AddrPort()) {
+		log.Debugln("[DNS] hijack udp:%s from %s", metadata.Destination.String(), metadata.Source.String())
+		writer := init(nil)
+		rwOptions := network.ReadWaitOptions{
+			FrontHeadroom: network.CalculateFrontHeadroom(writer),
+			RearHeadroom:  network.CalculateRearHeadroom(writer),
+			MTU:           resolver.SafeDnsPacketSize,
+		}
+		go relayDnsPacket(ctx, buffer, rwOptions, metadata.Destination, nil, &writer)
+		return
+	}
+	h.ListenerHandler.NewPacket(ctx, key, buffer, metadata, init)
+}
+
 func (h *ListenerHandler) NewPacketConnection(ctx context.Context, conn network.PacketConn, metadata M.Metadata) error {
 	if h.ShouldHijackDns(metadata.Destination.AddrPort()) {
 		log.Debugln("[DNS] hijack udp:%s from %s", metadata.Destination.String(), metadata.Source.String())
 		defer func() { _ = conn.Close() }()
 		mutex := sync.Mutex{}
-		conn2 := conn // a new interface to set nil in defer
+		var writer network.PacketWriter = conn // a new interface to set nil in defer
 		defer func() {
 			mutex.Lock() // this goroutine must exit after all conn.WritePacket() is not running
 			defer mutex.Unlock()
-			conn2 = nil
+			writer = nil
 		}()
 		rwOptions := network.ReadWaitOptions{
 			FrontHeadroom: network.CalculateFrontHeadroom(conn),
@@ -89,43 +104,47 @@ func (h *ListenerHandler) NewPacketConnection(ctx context.Context, conn network.
 				}
 				return err
 			}
-			go func() {
+			go relayDnsPacket(ctx, readBuff, rwOptions, dest, &mutex, &writer)
-				ctx, cancel := context.WithTimeout(ctx, resolver.DefaultDnsRelayTimeout)
-				defer cancel()
-				inData := readBuff.Bytes()
-				writeBuff := readBuff
-				writeBuff.Resize(writeBuff.Start(), 0)
-				if len(writeBuff.FreeBytes()) < resolver.SafeDnsPacketSize { // only create a new buffer when space don't enough
-					writeBuff = rwOptions.NewPacketBuffer()
-				}
-				msg, err := resolver.RelayDnsPacket(ctx, inData, writeBuff.FreeBytes())
-				if writeBuff != readBuff {
-					readBuff.Release()
-				}
-				if err != nil {
-					writeBuff.Release()
-					return
-				}
-				writeBuff.Truncate(len(msg))
-				mutex.Lock()
-				defer mutex.Unlock()
-				conn := conn2
-				if conn == nil {
-					writeBuff.Release()
-					return
-				}
-				err = conn.WritePacket(writeBuff, dest) // WritePacket will release writeBuff
-				if err != nil {
-					writeBuff.Release()
-					return
-				}
-			}()
 		}
 		return nil
 	}
 	return h.ListenerHandler.NewPacketConnection(ctx, conn, metadata)
 }
 
+func relayDnsPacket(ctx context.Context, readBuff *buf.Buffer, rwOptions network.ReadWaitOptions, dest M.Socksaddr, mutex *sync.Mutex, writer *network.PacketWriter) {
+	ctx, cancel := context.WithTimeout(ctx, resolver.DefaultDnsRelayTimeout)
+	defer cancel()
+	inData := readBuff.Bytes()
+	writeBuff := readBuff
+	writeBuff.Resize(writeBuff.Start(), 0)
+	if len(writeBuff.FreeBytes()) < resolver.SafeDnsPacketSize { // only create a new buffer when space don't enough
+		writeBuff = rwOptions.NewPacketBuffer()
+	}
+	msg, err := resolver.RelayDnsPacket(ctx, inData, writeBuff.FreeBytes())
+	if writeBuff != readBuff {
+		readBuff.Release()
+	}
+	if err != nil {
+		writeBuff.Release()
+		return
+	}
+	writeBuff.Truncate(len(msg))
+	if mutex != nil {
+		mutex.Lock()
+		defer mutex.Unlock()
+	}
+	conn := *writer
+	if conn == nil {
+		writeBuff.Release()
+		return
+	}
+	err = conn.WritePacket(writeBuff, dest) // WritePacket will release writeBuff
+	if err != nil {
+		writeBuff.Release()
+		return
+	}
+}
+
 func (h *ListenerHandler) TypeMutation(typ C.Type) *ListenerHandler {
 	handle := *h
 	handle.ListenerHandler = h.ListenerHandler.TypeMutation(typ)

transport/hysteria/conns/faketcp/tcp_linux.go

@@ -408,7 +408,7 @@ func Dial(network, address string) (*TCPConn, error) {
 	ifaceName := dialer.DefaultInterface.Load()
 	if ifaceName == "" {
 		if finder := dialer.DefaultInterfaceFinder.Load(); finder != nil {
-			ifaceName = finder.FindInterfaceName(rAddrPort.Addr())
+			ifaceName = finder.FindInterfaceName(rAddrPort.Addr().Unmap())
 		}
 	}
 	if len(ifaceName) > 0 {

tunnel/connection.go

@@ -5,11 +5,10 @@ import (
 	"errors"
 	"net"
 	"net/netip"
+	"sync"
 	"time"
 
-	"github.com/metacubex/mihomo/common/lru"
 	N "github.com/metacubex/mihomo/common/net"
-	"github.com/metacubex/mihomo/component/resolver"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/log"
 )
@@ -18,7 +17,11 @@ type packetSender struct {
 	ctx    context.Context
 	cancel context.CancelFunc
 	ch     chan C.PacketAdapter
-	cache  *lru.LruCache[string, netip.Addr]
+
+	// destination NAT mapping
+	originToTarget map[string]netip.Addr
+	targetToOrigin map[netip.Addr]netip.Addr
+	mappingMutex   sync.RWMutex
 }
 
 // newPacketSender return a chan based C.PacketSender
@@ -30,10 +33,74 @@ func newPacketSender() C.PacketSender {
 		ctx:    ctx,
 		cancel: cancel,
 		ch:     ch,
-		cache:  lru.New[string, netip.Addr](lru.WithSize[string, netip.Addr](senderCapacity)),
+
+		originToTarget: make(map[string]netip.Addr),
+		targetToOrigin: make(map[netip.Addr]netip.Addr),
 	}
 }
 
+func (s *packetSender) AddMapping(originMetadata *C.Metadata, metadata *C.Metadata) {
+	s.mappingMutex.Lock()
+	defer s.mappingMutex.Unlock()
+	originKey := originMetadata.String()
+	originAddr := originMetadata.DstIP
+	targetAddr := metadata.DstIP
+	if addr := s.originToTarget[originKey]; !addr.IsValid() { // overwrite only if the record is illegal
+		s.originToTarget[originKey] = targetAddr
+	}
+	if addr := s.targetToOrigin[targetAddr]; !addr.IsValid() { // overwrite only if the record is illegal
+		s.targetToOrigin[targetAddr] = originAddr
+	}
+}
+
+func (s *packetSender) RestoreReadFrom(addr netip.Addr) netip.Addr {
+	s.mappingMutex.RLock()
+	defer s.mappingMutex.RUnlock()
+	if originAddr := s.targetToOrigin[addr]; originAddr.IsValid() {
+		return originAddr
+	}
+	return addr
+}
+
+func (s *packetSender) processPacket(pc C.PacketConn, packet C.PacketAdapter) {
+	defer packet.Drop()
+	metadata := packet.Metadata()
+
+	var addr *net.UDPAddr
+
+	s.mappingMutex.RLock()
+	targetAddr := s.originToTarget[metadata.String()]
+	s.mappingMutex.RUnlock()
+
+	if targetAddr.IsValid() {
+		addr = net.UDPAddrFromAddrPort(netip.AddrPortFrom(targetAddr, metadata.DstPort))
+	}
+
+	if addr == nil {
+		originMetadata := metadata  // save origin metadata
+		metadata = metadata.Clone() // don't modify PacketAdapter's metadata
+
+		_ = preHandleMetadata(metadata) // error was pre-checked
+		metadata = metadata.Pure()
+		if metadata.Host != "" {
+			// TODO: ResolveUDP may take a long time to block the Process loop
+			//       but we want keep sequence sending so can't open a new goroutine
+			if err := pc.ResolveUDP(s.ctx, metadata); err != nil {
+				log.Warnln("[UDP] Resolve Ip error: %s", err)
+				return
+			}
+		}
+
+		if !metadata.DstIP.IsValid() {
+			log.Warnln("[UDP] Destination ip not valid: %#v", metadata)
+			return
+		}
+		s.AddMapping(originMetadata, metadata)
+		addr = metadata.UDPAddr()
+	}
+	_ = handleUDPToRemote(packet, pc, addr)
+}
+
 func (s *packetSender) Process(pc C.PacketConn, proxy C.WriteBackProxy) {
 	for {
 		select {
@@ -43,12 +110,7 @@ func (s *packetSender) Process(pc C.PacketConn, proxy C.WriteBackProxy) {
 			if proxy != nil {
 				proxy.UpdateWriteBack(packet)
 			}
-			if err := s.ResolveUDP(packet.Metadata()); err != nil {
+			s.processPacket(pc, packet)
-				log.Warnln("[UDP] Resolve Ip error: %s", err)
-			} else {
-				_ = handleUDPToRemote(packet, pc, packet.Metadata())
-			}
-			packet.Drop()
 		}
 	}
 }
@@ -87,25 +149,9 @@ func (s *packetSender) Close() {
 	s.dropAll()
 }
 
-func (s *packetSender) ResolveUDP(metadata *C.Metadata) (err error) {
+func (s *packetSender) DoSniff(metadata *C.Metadata) error { return nil }
-	// local resolve UDP dns
-	if !metadata.Resolved() {
-		ip, ok := s.cache.Get(metadata.Host)
-		if !ok {
-			ip, err = resolver.ResolveIP(s.ctx, metadata.Host)
-			if err != nil {
-				return err
-			}
-			s.cache.Set(metadata.Host, ip)
-		}
 
-		metadata.DstIP = ip
+func handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, addr *net.UDPAddr) error {
-	}
-	return nil
-}
-
-func handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata) error {
-	addr := metadata.UDPAddr()
 	if addr == nil {
 		return errors.New("udp addr invalid")
 	}
@@ -119,7 +165,7 @@ func handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata
 	return nil
 }
 
-func handleUDPToLocal(writeBack C.WriteBack, pc N.EnhancePacketConn, sender C.PacketSender, key string, oAddrPort netip.AddrPort, fAddr netip.Addr) {
+func handleUDPToLocal(writeBack C.WriteBack, pc C.PacketConn, sender C.PacketSender, key string, oAddrPort netip.AddrPort) {
 	defer func() {
 		sender.Close()
 		_ = pc.Close()
@@ -141,22 +187,17 @@ func handleUDPToLocal(writeBack C.WriteBack, pc N.EnhancePacketConn, sender C.Pa
 		} else if fromUDPAddr == nil {
 			fromUDPAddr = net.UDPAddrFromAddrPort(oAddrPort) // oAddrPort was Unmapped
 			log.Warnln("server return a nil *net.UDPAddr, force replace to (%s), this may be caused by a wrongly implemented server", oAddrPort)
-		} else {
-			_fromUDPAddr := *fromUDPAddr
-			fromUDPAddr = &_fromUDPAddr // make a copy
-			if fromAddr, ok := netip.AddrFromSlice(fromUDPAddr.IP); ok {
-				fromAddr = fromAddr.Unmap()
-				if fAddr.IsValid() && (oAddrPort.Addr() == fromAddr) { // oAddrPort was Unmapped
-					fromAddr = fAddr.Unmap()
-				}
-				fromUDPAddr.IP = fromAddr.AsSlice()
-				if fromAddr.Is4() {
-					fromUDPAddr.Zone = "" // only ipv6 can have the zone
-				}
-			}
 		}
 
-		_, err = writeBack.WriteBack(data, fromUDPAddr)
+		fromAddrPort := fromUDPAddr.AddrPort()
+		fromAddr := fromAddrPort.Addr().Unmap()
+
+		// restore DestinationNAT
+		fromAddr = sender.RestoreReadFrom(fromAddr).Unmap()
+
+		fromAddrPort = netip.AddrPortFrom(fromAddr, fromAddrPort.Port())
+
+		_, err = writeBack.WriteBack(data, net.UDPAddrFromAddrPort(fromAddrPort))
 		if put != nil {
 			put()
 		}

tunnel/statistic/tracker.go

@@ -3,7 +3,6 @@ package statistic
 import (
 	"io"
 	"net"
-	"net/netip"
 	"time"
 
 	"github.com/metacubex/mihomo/common/atomic"
@@ -116,20 +115,8 @@ func (tt *tcpTracker) Upstream() any {
 	return tt.Conn
 }
 
-func parseRemoteDestination(addr net.Addr, conn C.Connection) string {
-	if addr != nil {
-		if addrPort, err := netip.ParseAddrPort(addr.String()); err == nil && addrPort.Addr().IsValid() {
-			return addrPort.Addr().String()
-		}
-	}
-	if conn != nil {
-		return conn.RemoteDestination()
-	}
-	return ""
-}
-
 func NewTCPTracker(conn C.Conn, manager *Manager, metadata *C.Metadata, rule C.Rule, uploadTotal int64, downloadTotal int64, pushToManager bool) *tcpTracker {
-	metadata.RemoteDst = parseRemoteDestination(conn.RemoteAddr(), conn)
+	metadata.RemoteDst = conn.RemoteDestination()
 
 	t := &tcpTracker{
 		Conn:    conn,
@@ -220,7 +207,7 @@ func (ut *udpTracker) Upstream() any {
 }
 
 func NewUDPTracker(conn C.PacketConn, manager *Manager, metadata *C.Metadata, rule C.Rule, uploadTotal int64, downloadTotal int64, pushToManager bool) *udpTracker {
-	metadata.RemoteDst = parseRemoteDestination(nil, conn)
+	metadata.RemoteDst = conn.RemoteDestination()
 
 	ut := &udpTracker{
 		PacketConn: conn,

tunnel/tunnel.go

@@ -287,17 +287,21 @@ func isHandle(t C.Type) bool {
 	return status == Running || (status == Inner && t == C.INNER)
 }
 
+func fixMetadata(metadata *C.Metadata) {
+	// first unmap dstIP
+	metadata.DstIP = metadata.DstIP.Unmap()
+	// handle IP string on host
+	if ip, err := netip.ParseAddr(metadata.Host); err == nil {
+		metadata.DstIP = ip.Unmap()
+		metadata.Host = ""
+	}
+}
+
 func needLookupIP(metadata *C.Metadata) bool {
 	return resolver.MappingEnabled() && metadata.Host == "" && metadata.DstIP.IsValid()
 }
 
 func preHandleMetadata(metadata *C.Metadata) error {
-	// handle IP string on host
-	if ip, err := netip.ParseAddr(metadata.Host); err == nil {
-		metadata.DstIP = ip
-		metadata.Host = ""
-	}
-
 	// preprocess enhanced-mode metadata
 	if needLookupIP(metadata) {
 		host, exist := resolver.FindHostByIP(metadata.DstIP)
@@ -365,14 +369,9 @@ func handleUDPConn(packet C.PacketAdapter) {
 		log.Warnln("[Metadata] not valid: %#v", metadata)
 		return
 	}
+	fixMetadata(metadata) // fix some metadata not set via metadata.SetRemoteAddr or metadata.SetRemoteAddress
 
-	// make a fAddr if request ip is fakeip
+	if err := preHandleMetadata(metadata.Clone()); err != nil { // precheck without modify metadata
-	var fAddr netip.Addr
-	if resolver.IsExistFakeIP(metadata.DstIP) {
-		fAddr = metadata.DstIP
-	}
-
-	if err := preHandleMetadata(metadata); err != nil {
 		packet.Drop()
 		log.Debugln("[Metadata PreHandle] error: %s", err)
 		return
@@ -388,21 +387,27 @@ func handleUDPConn(packet C.PacketAdapter) {
 	})
 	if !loaded {
 		dial := func() (C.PacketConn, C.WriteBackProxy, error) {
-			if err := sender.ResolveUDP(metadata); err != nil {
+			originMetadata := metadata  // save origin metadata
-				log.Warnln("[UDP] Resolve Ip error: %s", err)
+			metadata = metadata.Clone() // don't modify PacketAdapter's metadata
+
+			if err := sender.DoSniff(metadata); err != nil {
+				log.Warnln("[UDP] DoSniff error: %s", err.Error())
 				return nil, nil, err
 			}
 
+			_ = preHandleMetadata(metadata) // error was pre-checked
+
 			proxy, rule, err := resolveMetadata(metadata)
 			if err != nil {
 				log.Warnln("[UDP] Parse metadata failed: %s", err.Error())
 				return nil, nil, err
 			}
 
+			dialMetadata := metadata.Pure()
 			ctx, cancel := context.WithTimeout(context.Background(), C.DefaultUDPTimeout)
 			defer cancel()
 			rawPc, err := retry(ctx, func(ctx context.Context) (C.PacketConn, error) {
-				return proxy.ListenPacketContext(ctx, metadata.Pure())
+				return proxy.ListenPacketContext(ctx, dialMetadata)
 			}, func(err error) {
 				logMetadataErr(metadata, rule, proxy, err)
 			})
@@ -413,15 +418,11 @@ func handleUDPConn(packet C.PacketAdapter) {
 
 			pc := statistic.NewUDPTracker(rawPc, statistic.DefaultManager, metadata, rule, 0, 0, true)
 
-			if rawPc.Chains().Last() == "REJECT-DROP" {
+			sender.AddMapping(originMetadata, dialMetadata)
-				_ = pc.Close()
+			oAddrPort := dialMetadata.AddrPort()
-				return nil, nil, errors.New("rejected drop packet")
-			}
-
-			oAddrPort := metadata.AddrPort()
 			writeBackProxy := nat.NewWriteBackProxy(packet)
 
-			go handleUDPToLocal(writeBackProxy, pc, sender, key, oAddrPort, fAddr)
+			go handleUDPToLocal(writeBackProxy, pc, sender, key, oAddrPort)
 			return pc, writeBackProxy, nil
 		}
 
@@ -453,6 +454,7 @@ func handleTCPConn(connCtx C.ConnContext) {
 		log.Warnln("[Metadata] not valid: %#v", metadata)
 		return
 	}
+	fixMetadata(metadata) // fix some metadata not set via metadata.SetRemoteAddr or metadata.SetRemoteAddress
 
 	preHandleFailed := false
 	if err := preHandleMetadata(metadata); err != nil {