Use std parser instead of homemade

Co-authored-by: 风扇滑翔翼 <Fangliding.fshxy@outlook.com>

.github/workflows/docker.yml

@@ -82,7 +82,7 @@ jobs:
         uses: docker/setup-buildx-action@v4
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v4
+        uses: docker/login-action@v4.6.0
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}

app/observatory/observer.go

@@ -78,6 +78,12 @@ func (o *Observer) background() {
 			sleepTime = time.Duration(o.config.ProbeInterval)
 		}
 
+		if len(outbounds) == 0 {
+			errors.LogWarning(o.ctx, "no outbound matches subjectSelector ", o.config.SubjectSelector)
+			time.Sleep(sleepTime)
+			continue
+		}
+
 		if !o.config.EnableConcurrency {
 			sort.Strings(outbounds)
 			for _, v := range outbounds {

app/proxyman/outbound/handler.go

@@ -347,7 +347,6 @@ func (h *Handler) SetOutboundGateway(ctx context.Context, ob *session.Outbound)
 		// case addr.Family().IsDomain():
 		default:
 			ob.Gateway = addr
-
 		}
 
 	}

app/router/balancing.go

@@ -136,7 +136,7 @@ func (b *Balancer) SelectOutbounds() ([]string, error) {
 
 // GetPrincipleTarget implements routing.BalancerPrincipleTarget
 func (r *Router) GetPrincipleTarget(tag string) ([]string, error) {
-	if b, ok := r.balancers[tag]; ok {
+	if b, ok := (*r.balancers.Load())[tag]; ok {
 		if s, ok := b.strategy.(BalancingPrincipleTarget); ok {
 			candidates, err := b.SelectOutbounds()
 			if err != nil {
@@ -151,7 +151,7 @@ func (r *Router) GetPrincipleTarget(tag string) ([]string, error) {
 
 // SetOverrideTarget implements routing.BalancerOverrider
 func (r *Router) SetOverrideTarget(tag, target string) error {
-	if b, ok := r.balancers[tag]; ok {
+	if b, ok := (*r.balancers.Load())[tag]; ok {
 		b.override.Put(target)
 		return nil
 	}
@@ -160,7 +160,7 @@ func (r *Router) SetOverrideTarget(tag, target string) error {
 
 // GetOverrideTarget implements routing.BalancerOverrider
 func (r *Router) GetOverrideTarget(tag string) (string, error) {
-	if b, ok := r.balancers[tag]; ok {
+	if b, ok := (*r.balancers.Load())[tag]; ok {
 		return b.override.Get(), nil
 	}
 	return "", errors.New("cannot find tag")

app/router/balancing_override.go

@@ -2,25 +2,8 @@ package router
 
 import (
 	sync "sync"
-
-	"github.com/xtls/xray-core/common/errors"
 )
 
-func (r *Router) OverrideBalancer(balancer string, target string) error {
-	var b *Balancer
-	for tag, bl := range r.balancers {
-		if tag == balancer {
-			b = bl
-			break
-		}
-	}
-	if b == nil {
-		return errors.New("balancer '", balancer, "' not found")
-	}
-	b.override.Put(target)
-	return nil
-}
-
 type overrideSettings struct {
 	target string
 }

app/router/condition.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"runtime"
 	"slices"
 	"strings"
 
@@ -393,3 +394,22 @@ func (m *ProcessNameMatcher) Apply(ctx routing.Context) bool {
 	}
 	return false
 }
+
+// LocalOSMatcher matches the operating system Xray itself is running on. That never
+// changes while Xray is running, so the result is resolved when the rule is built.
+type LocalOSMatcher struct {
+	matched bool
+}
+
+func NewLocalOSMatcher(names []string) *LocalOSMatcher {
+	return &LocalOSMatcher{
+		matched: slices.ContainsFunc(names, func(name string) bool {
+			return strings.EqualFold(name, runtime.GOOS)
+		}),
+	}
+}
+
+// Apply implements Condition.
+func (m *LocalOSMatcher) Apply(_ routing.Context) bool {
+	return m.matched
+}

app/router/condition_test.go

@@ -2,7 +2,9 @@ package router_test
 
 import (
 	"path/filepath"
+	"runtime"
 	"strconv"
+	"strings"
 	"testing"
 
 	. "github.com/xtls/xray-core/app/router"
@@ -343,6 +345,31 @@ func TestChinaSites(t *testing.T) {
 	}
 }
 
+func TestLocalOSRule(t *testing.T) {
+	otherOS := "plan9"
+	if runtime.GOOS == otherOS {
+		otherOS = "linux"
+	}
+
+	cases := []struct {
+		localOS []string
+		output  bool
+	}{
+		{localOS: []string{runtime.GOOS}, output: true},
+		{localOS: []string{otherOS}, output: false},
+		{localOS: []string{otherOS, runtime.GOOS}, output: true},
+		{localOS: []string{strings.ToUpper(runtime.GOOS)}, output: true},
+	}
+
+	for _, test := range cases {
+		cond, err := (&RoutingRule{LocalOs: test.localOS}).BuildCondition()
+		common.Must(err)
+		if got := cond.Apply(withBackground()); got != test.output {
+			t.Errorf("for localOS %v on %s: expected %v, got %v", test.localOS, runtime.GOOS, test.output, got)
+		}
+	}
+}
+
 func BenchmarkMphDomainMatcher(b *testing.B) {
 	b.Setenv("xray.location.asset", filepath.Join("..", "..", "resources"))
 	rules, err := geodata.ParseDomainRules([]string{"geosite:cn"}, geodata.Domain_Substr)

app/router/config.go

@@ -33,6 +33,10 @@ func (r *Rule) Apply(ctx routing.Context) bool {
 func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	conds := NewConditionChan()
 
+	if len(rr.LocalOs) > 0 {
+		conds.Add(NewLocalOSMatcher(rr.LocalOs))
+	}
+
 	if len(rr.InboundTag) > 0 {
 		conds.Add(NewInboundTagMatcher(rr.InboundTag))
 	}

app/router/config.pb.go

@@ -107,8 +107,10 @@ type RoutingRule struct {
 	VlessRouteList *net.PortList  `protobuf:"bytes,20,opt,name=vless_route_list,json=vlessRouteList,proto3" json:"vless_route_list,omitempty"`
 	Process        []string       `protobuf:"bytes,21,rep,name=process,proto3" json:"process,omitempty"`
 	Webhook        *WebhookConfig `protobuf:"bytes,22,opt,name=webhook,proto3" json:"webhook,omitempty"`
-	unknownFields  protoimpl.UnknownFields
-	sizeCache      protoimpl.SizeCache
+	// List of operating systems for matching the one Xray itself is running on.
+	LocalOs       []string `protobuf:"bytes,23,rep,name=local_os,json=localOs,proto3" json:"local_os,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
 }
 
 func (x *RoutingRule) Reset() {
@@ -278,6 +280,13 @@ func (x *RoutingRule) GetWebhook() *WebhookConfig {
 	return nil
 }
 
+func (x *RoutingRule) GetLocalOs() []string {
+	if x != nil {
+		return x.LocalOs
+	}
+	return nil
+}
+
 type isRoutingRule_TargetTag interface {
 	isRoutingRule_TargetTag()
 }
@@ -637,7 +646,7 @@ var File_app_router_config_proto protoreflect.FileDescriptor
 
 const file_app_router_config_proto_rawDesc = "" +
 	"\n" +
-	"\x17app/router/config.proto\x12\x0fxray.app.router\x1a!common/serial/typed_message.proto\x1a\x15common/net/port.proto\x1a\x18common/net/network.proto\x1a\x1bcommon/geodata/geodat.proto\"\xc1\a\n" +
+	"\x17app/router/config.proto\x12\x0fxray.app.router\x1a!common/serial/typed_message.proto\x1a\x15common/net/port.proto\x1a\x18common/net/network.proto\x1a\x1bcommon/geodata/geodat.proto\"\xdc\a\n" +
 	"\vRoutingRule\x12\x12\n" +
 	"\x03tag\x18\x01 \x01(\tH\x00R\x03tag\x12%\n" +
 	"\rbalancing_tag\x18\f \x01(\tH\x00R\fbalancingTag\x12\x19\n" +
@@ -661,7 +670,8 @@ const file_app_router_config_proto_rawDesc = "" +
 	"\x0flocal_port_list\x18\x12 \x01(\v2\x19.xray.common.net.PortListR\rlocalPortList\x12C\n" +
 	"\x10vless_route_list\x18\x14 \x01(\v2\x19.xray.common.net.PortListR\x0evlessRouteList\x12\x18\n" +
 	"\aprocess\x18\x15 \x03(\tR\aprocess\x128\n" +
-	"\awebhook\x18\x16 \x01(\v2\x1e.xray.app.router.WebhookConfigR\awebhook\x1a=\n" +
+	"\awebhook\x18\x16 \x01(\v2\x1e.xray.app.router.WebhookConfigR\awebhook\x12\x19\n" +
+	"\blocal_os\x18\x17 \x03(\tR\alocalOs\x1a=\n" +
 	"\x0fAttributesEntry\x12\x10\n" +
 	"\x03key\x18\x01 \x01(\tR\x03key\x12\x14\n" +
 	"\x05value\x18\x02 \x01(\tR\x05value:\x028\x01B\f\n" +

app/router/config.proto

@@ -56,6 +56,9 @@ message RoutingRule {
 
   repeated string process = 21;
   WebhookConfig webhook = 22;
+
+  // List of operating systems for matching the one Xray itself is running on.
+  repeated string local_os = 23;
 }
 
 message WebhookConfig {

app/router/router.go

@@ -2,7 +2,9 @@ package router
 
 import (
 	"context"
+	"maps"
 	"sync"
+	"sync/atomic"
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
@@ -17,8 +19,8 @@ import (
 // Router is an implementation of routing.Router.
 type Router struct {
 	domainStrategy Config_DomainStrategy
-	rules          []*Rule
-	balancers      map[string]*Balancer
+	rules          atomic.Pointer[[]*Rule]
+	balancers      atomic.Pointer[map[string]*Balancer]
 	dns            dns.Client
 
 	ctx        context.Context
@@ -43,52 +45,9 @@ func (r *Router) Init(ctx context.Context, config *Config, d dns.Client, ohm out
 	r.ohm = ohm
 	r.dispatcher = dispatcher
 
-	r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
-	for _, rule := range config.BalancingRule {
-		balancer, err := rule.Build(ohm, dispatcher)
-		if err != nil {
-			return err
-		}
-		balancer.InjectContext(ctx)
-		r.balancers[rule.Tag] = balancer
-	}
-
-	r.rules = make([]*Rule, 0, len(config.Rule))
-	for _, rule := range config.Rule {
-		cond, err := rule.BuildCondition()
-		if err != nil {
-			r.closeWebhooks()
-			return err
-		}
-		rr := &Rule{
-			Condition: cond,
-			Tag:       rule.GetTag(),
-			RuleTag:   rule.GetRuleTag(),
-		}
-		if wh := rule.GetWebhook(); wh != nil {
-			notifier, err := NewWebhookNotifier(wh)
-			if err != nil {
-				r.closeWebhooks()
-				return err
-			}
-			rr.Webhook = notifier
-		}
-		btag := rule.GetBalancingTag()
-		if len(btag) > 0 {
-			brule, found := r.balancers[btag]
-			if !found {
-				if rr.Webhook != nil {
-					rr.Webhook.Close()
-				}
-				r.closeWebhooks()
-				return errors.New("balancer ", btag, " not found")
-			}
-			rr.Balancer = brule
-		}
-		r.rules = append(r.rules, rr)
-	}
-
-	return nil
+	r.rules.Store(new([]*Rule))
+	r.balancers.Store(&map[string]*Balancer{})
+	return r.ReloadRules(config, false)
 }
 
 // PickRoute implements routing.Router.
@@ -124,18 +83,22 @@ func (r *Router) ReloadRules(config *Config, shouldAppend bool) error {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
-	if !shouldAppend {
-		for _, rule := range r.rules {
-			if rule.Webhook != nil {
-				rule.Webhook.Close()
-			}
+	oldRules := *r.rules.Load()
+	oldBalancers := *r.balancers.Load()
+
+	var newRules []*Rule
+	newBalancers := make(map[string]*Balancer)
+	existTags := make(map[string]bool, len(oldRules)+len(config.Rule))
+	if shouldAppend {
+		newRules = append(newRules, oldRules...)
+		maps.Copy(newBalancers, oldBalancers)
+		for _, rule := range oldRules {
+			existTags[rule.RuleTag] = true
 		}
-		r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
-		r.rules = make([]*Rule, 0, len(config.Rule))
 	}
+
 	for _, rule := range config.BalancingRule {
-		_, found := r.balancers[rule.Tag]
-		if found {
+		if _, found := newBalancers[rule.Tag]; found {
 			return errors.New("duplicate balancer tag")
 		}
 		balancer, err := rule.Build(r.ohm, r.dispatcher)
@@ -143,27 +106,12 @@ func (r *Router) ReloadRules(config *Config, shouldAppend bool) error {
 			return err
 		}
 		balancer.InjectContext(r.ctx)
-		r.balancers[rule.Tag] = balancer
-	}
-
-	startIdx := len(r.rules)
-	closeNewWebhooks := func() {
-		for i := startIdx; i < len(r.rules); i++ {
-			if r.rules[i].Webhook != nil {
-				r.rules[i].Webhook.Close()
-			}
-		}
-		r.rules = r.rules[:startIdx]
+		newBalancers[rule.Tag] = balancer
 	}
 
 	for _, rule := range config.Rule {
-		if r.RuleExists(rule.GetRuleTag()) {
-			closeNewWebhooks()
-			return errors.New("duplicate ruleTag ", rule.GetRuleTag())
-		}
 		cond, err := rule.BuildCondition()
 		if err != nil {
-			closeNewWebhooks()
 			return err
 		}
 		rr := &Rule{
@@ -171,69 +119,64 @@ func (r *Router) ReloadRules(config *Config, shouldAppend bool) error {
 			Tag:       rule.GetTag(),
 			RuleTag:   rule.GetRuleTag(),
 		}
+		if rr.RuleTag != "" && existTags[rr.RuleTag] {
+			return errors.New("duplicate ruleTag ", rr.RuleTag)
+		}
+		existTags[rr.RuleTag] = true
 		if wh := rule.GetWebhook(); wh != nil {
 			notifier, err := NewWebhookNotifier(wh)
 			if err != nil {
-				closeNewWebhooks()
 				return err
 			}
 			rr.Webhook = notifier
 		}
-		btag := rule.GetBalancingTag()
-		if len(btag) > 0 {
-			brule, found := r.balancers[btag]
+		if btag := rule.GetBalancingTag(); len(btag) > 0 {
+			brule, found := newBalancers[btag]
 			if !found {
-				if rr.Webhook != nil {
-					rr.Webhook.Close()
-				}
-				closeNewWebhooks()
 				return errors.New("balancer ", btag, " not found")
 			}
 			rr.Balancer = brule
 		}
-		r.rules = append(r.rules, rr)
+		newRules = append(newRules, rr)
 	}
 
+	r.balancers.Store(&newBalancers)
+	r.rules.Store(&newRules)
+	if !shouldAppend {
+		closeWebhooks(oldRules)
+	}
 	return nil
 }
 
-func (r *Router) RuleExists(tag string) bool {
-	if tag != "" {
-		for _, rule := range r.rules {
-			if rule.RuleTag == tag {
-				return true
-			}
-		}
-	}
-	return false
-}
-
 // RemoveRule implements routing.Router.
 func (r *Router) RemoveRule(tag string) error {
+	if tag == "" {
+		return errors.New("empty tag name!")
+	}
+
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
-	newRules := []*Rule{}
-	if tag != "" {
-		for _, rule := range r.rules {
-			if rule.RuleTag != tag {
-				newRules = append(newRules, rule)
-			} else if rule.Webhook != nil {
-				rule.Webhook.Close()
-			}
+	oldRules := *r.rules.Load()
+	newRules := make([]*Rule, 0, len(oldRules))
+	var removed []*Rule
+	for _, rule := range oldRules {
+		if rule.RuleTag != tag {
+			newRules = append(newRules, rule)
+		} else {
+			removed = append(removed, rule)
 		}
-		r.rules = newRules
-		return nil
 	}
-	return errors.New("empty tag name!")
+	r.rules.Store(&newRules)
+	closeWebhooks(removed)
+	return nil
 }
 
 // ListRule implements routing.Router
 func (r *Router) ListRule() []routing.Route {
-	r.mu.Lock()
-	defer r.mu.Unlock()
-	ruleList := make([]routing.Route, 0)
-	for _, rule := range r.rules {
+	rules := *r.rules.Load()
+	ruleList := make([]routing.Route, 0, len(rules))
+	for _, rule := range rules {
 		ruleList = append(ruleList, &Route{
 			outboundTag: rule.Tag,
 			ruleTag:     rule.RuleTag,
@@ -252,7 +195,9 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 		ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
 	}
 
-	for _, rule := range r.rules {
+	rules := *r.rules.Load()
+
+	for _, rule := range rules {
 		if rule.Apply(ctx) {
 			return rule, ctx, nil
 		}
@@ -265,7 +210,7 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 	ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
 
 	// Try applying rules again if we have IPs.
-	for _, rule := range r.rules {
+	for _, rule := range rules {
 		if rule.Apply(ctx) {
 			return rule, ctx, nil
 		}
@@ -279,9 +224,9 @@ func (r *Router) Start() error {
 	return nil
 }
 
-// closeWebhooks closes all webhook notifiers in the current rule set.
-func (r *Router) closeWebhooks() {
-	for _, rule := range r.rules {
+// closeWebhooks closes all webhook notifiers in the given rule set.
+func closeWebhooks(rules []*Rule) {
+	for _, rule := range rules {
 		if rule.Webhook != nil {
 			rule.Webhook.Close()
 		}
@@ -292,7 +237,7 @@ func (r *Router) closeWebhooks() {
 func (r *Router) Close() error {
 	r.mu.Lock()
 	defer r.mu.Unlock()
-	r.closeWebhooks()
+	closeWebhooks(*r.rules.Load())
 	return nil
 }
 

app/router/webhook.go

@@ -8,6 +8,7 @@ import (
 	"net"
 	"net/http"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/xtls/xray-core/common/errors"
@@ -40,6 +41,7 @@ type WebhookNotifier struct {
 	deduplication uint32
 	client        *http.Client
 	seen          sync.Map
+	lastSweep     atomic.Int64
 	done          chan struct{}
 	wg            sync.WaitGroup
 	closeOnce     sync.Once
@@ -77,11 +79,6 @@ func NewWebhookNotifier(cfg *WebhookConfig) (*WebhookNotifier, error) {
 		}
 	}
 
-	if h.deduplication > 0 {
-		h.wg.Add(1)
-		go h.cleanupLoop()
-	}
-
 	return h, nil
 }
 
@@ -201,6 +198,7 @@ func (h *WebhookNotifier) isDuplicate(email string) bool {
 	}
 	ttl := time.Duration(h.deduplication) * time.Second
 	now := time.Now()
+	h.maybeSweep(now, ttl)
 	if v, loaded := h.seen.LoadOrStore(email, now); loaded {
 		if now.Sub(v.(time.Time)) < ttl {
 			return true
@@ -210,27 +208,23 @@ func (h *WebhookNotifier) isDuplicate(email string) bool {
 	return false
 }
 
-func (h *WebhookNotifier) cleanupLoop() {
-	defer h.wg.Done()
-	ttl := time.Duration(h.deduplication) * time.Second
-	ticker := time.NewTicker(ttl)
-	defer ticker.Stop()
-	for {
-		select {
-		case <-h.done:
-			return
-		case <-ticker.C:
-			now := time.Now()
-			h.seen.Range(func(key, value any) bool {
-				if now.Sub(value.(time.Time)) >= ttl {
-					h.seen.Delete(key)
-				}
-				return true
-			})
-		}
+func (h *WebhookNotifier) maybeSweep(now time.Time, ttl time.Duration) {
+	last := h.lastSweep.Load()
+	if now.UnixNano()-last < int64(ttl) {
+		return
 	}
+	if !h.lastSweep.CompareAndSwap(last, now.UnixNano()) {
+		return // another goroutine did the sweep
+	}
+	h.seen.Range(func(key, value any) bool {
+		if now.Sub(value.(time.Time)) >= ttl {
+			h.seen.Delete(key)
+		}
+		return true
+	})
 }
 
+// Only need to call if the Notifier is really used, otherwise GC can clean it
 func (h *WebhookNotifier) Close() error {
 	h.closeOnce.Do(func() {
 		close(h.done)

common/net/find_process_darwin.go

@@ -198,7 +198,9 @@ func darwinSocketInfoMatchLevel(info []byte, network string, srcAddr netip.Addr,
 
 	vflag := info[darwinInSockInfoVFlagOff]
 	if srcAddr.Is4() {
-		if family != unix.AF_INET || vflag&darwinInSockInfoIPv4 == 0 {
+		// Dual-stack sockets expose IPv4-mapped connections as AF_INET6
+		// while marking the endpoint as IPv4 in ini_vflag.
+		if (family != unix.AF_INET && family != unix.AF_INET6) || vflag&darwinInSockInfoIPv4 == 0 {
 			return darwinSocketNoMatch
 		}
 	} else {

common/net/find_process_darwin_test.go

@@ -52,6 +52,57 @@ func TestFindProcessDarwinTCP(t *testing.T) {
 	assertCurrentProcess(t, pid, name, path)
 }
 
+func TestFindProcessDarwinTCPIPv4Mapped(t *testing.T) {
+	listener, err := stdnet.Listen("tcp4", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer listener.Close()
+
+	accepted := make(chan stdnet.Conn, 1)
+	go func() {
+		conn, err := listener.Accept()
+		if err == nil {
+			accepted <- conn
+			return
+		}
+		close(accepted)
+	}()
+
+	listenerAddr := listener.Addr().(*stdnet.TCPAddr)
+	fd, err := unix.Socket(unix.AF_INET6, unix.SOCK_STREAM, unix.IPPROTO_TCP)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer unix.Close(fd)
+
+	mappedAddr := [16]byte{10: 0xff, 11: 0xff, 12: 127, 15: 1}
+	if err := unix.Connect(fd, &unix.SockaddrInet6{
+		Port: listenerAddr.Port,
+		Addr: mappedAddr,
+	}); err != nil {
+		t.Fatal(err)
+	}
+
+	serverConn := <-accepted
+	if serverConn == nil {
+		t.Fatal("server did not accept tcp connection")
+	}
+	defer serverConn.Close()
+
+	local, err := unix.Getsockname(fd)
+	if err != nil {
+		t.Fatal(err)
+	}
+	localPort := local.(*unix.SockaddrInet6).Port
+
+	pid, name, path, err := FindProcess("tcp", "127.0.0.1", uint16(localPort), "127.0.0.1", uint16(listenerAddr.Port))
+	if err != nil {
+		t.Fatal(err)
+	}
+	assertCurrentProcess(t, pid, name, path)
+}
+
 func TestFindProcessDarwinUDP(t *testing.T) {
 	conn, err := stdnet.ListenUDP("udp", &stdnet.UDPAddr{IP: stdnet.ParseIP("127.0.0.1")})
 	if err != nil {
@@ -264,6 +315,18 @@ func TestDarwinSocketInfoMatchLevelFallbacks(t *testing.T) {
 	}
 }
 
+func TestDarwinSocketInfoMatchLevelIPv4Mapped(t *testing.T) {
+	src := netip.MustParseAddr("127.0.0.1")
+	dst := netip.MustParseAddr("203.0.113.10")
+	info := newDarwinSocketInfo("tcp", src, 12345, dst, 443)
+	writeDarwinNativeUint32(info, darwinSocketInfoFamilyOff, uint32(unix.AF_INET6))
+
+	level := darwinSocketInfoMatchLevel(info, "tcp", src, 12345, dst, 443, true)
+	if level != darwinSocketExactMatch {
+		t.Fatalf("unexpected match level: got %d, want %d", level, darwinSocketExactMatch)
+	}
+}
+
 func newDarwinSocketInfo(network string, local netip.Addr, localPort uint16, remote netip.Addr, remotePort uint16) []byte {
 	info := make([]byte, darwinSocketFDInfoSize)
 	switch network {

common/protocol/bittorrent/bittorrent.go

@@ -3,11 +3,8 @@ package bittorrent
 import (
 	"encoding/binary"
 	"errors"
-	"math"
-	"time"
 
 	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
 )
 
 type SniffHeader struct{}
@@ -39,50 +36,44 @@ func SniffUTP(b []byte) (*SniffHeader, error) {
 		return nil, common.ErrNoClue
 	}
 
-	buffer := buf.FromBytes(b)
-
-	var typeAndVersion uint8
-
-	if binary.Read(buffer, binary.BigEndian, &typeAndVersion) != nil {
-		return nil, common.ErrNoClue
-	} else if b[0]>>4&0xF > 4 || b[0]&0xF != 1 {
+	// type 4 (ST_SYN), version 1
+	if b[0] != 0x41 {
 		return nil, errNotBittorrent
 	}
 
-	var extension uint8
-
-	if binary.Read(buffer, binary.BigEndian, &extension) != nil {
-		return nil, common.ErrNoClue
-	} else if extension != 0 && extension != 1 {
+	// timestamp_difference is always 0 in new connections
+	if binary.BigEndian.Uint32(b[8:12]) != 0 {
 		return nil, errNotBittorrent
 	}
 
+	// Walk the extension chain. Selective ack (1) and extension bits (2)
+	extension, offset := b[1], 20
 	for extension != 0 {
-		if extension != 1 {
+		if len(b) < offset+2 {
 			return nil, errNotBittorrent
 		}
-		if binary.Read(buffer, binary.BigEndian, &extension) != nil {
-			return nil, common.ErrNoClue
+		length := int(b[offset+1])
+		switch extension {
+		case 1: // selective ack
+			if length < 4 || length%4 != 0 {
+				return nil, errNotBittorrent
+			}
+		case 2: // extension bits: fixed 8 bytes, sent in ST_SYN by µTorrent
+			if length != 8 {
+				return nil, errNotBittorrent
+			}
+		default:
+			return nil, errNotBittorrent
 		}
-
-		var length uint8
-		if err := binary.Read(buffer, binary.BigEndian, &length); err != nil {
-			return nil, common.ErrNoClue
-		}
-		if common.Error2(buffer.ReadBytes(int32(length))) != nil {
-			return nil, common.ErrNoClue
+		if len(b) < offset+2+length {
+			return nil, errNotBittorrent
 		}
+		extension = b[offset]
+		offset += 2 + length
 	}
 
-	if common.Error2(buffer.ReadBytes(2)) != nil {
-		return nil, common.ErrNoClue
-	}
-
-	var timestamp uint32
-	if err := binary.Read(buffer, binary.BigEndian, &timestamp); err != nil {
-		return nil, common.ErrNoClue
-	}
-	if math.Abs(float64(time.Now().UnixMicro()-int64(timestamp))) > float64(24*time.Hour) {
+	// extensions should consume all ST_SYN payload
+	if len(b) != offset {
 		return nil, errNotBittorrent
 	}
 

common/protocol/bittorrent/bittorrent_test.go

@@ -0,0 +1,67 @@
+package bittorrent
+
+import (
+	"encoding/binary"
+	"testing"
+
+	"github.com/xtls/xray-core/common"
+)
+
+// utpPacket builds the fixed 20-byte header defined by BEP 29.
+func utpPacket(packetType, extension byte, tsDiff uint32, payload ...byte) []byte {
+	b := make([]byte, 20)
+	b[0] = packetType<<4 | 1
+	b[1] = extension
+	binary.BigEndian.PutUint16(b[2:4], 0x4a3f)     // connection_id, random
+	binary.BigEndian.PutUint32(b[4:8], 0x8c3a91d2) // timestamp_microseconds, sender's clock
+	binary.BigEndian.PutUint32(b[8:12], tsDiff)
+	binary.BigEndian.PutUint32(b[12:16], 0x00100000) // wnd_size
+	binary.BigEndian.PutUint16(b[16:18], 0x71ee)     // seq_nr, random in libutp/libtorrent
+	binary.BigEndian.PutUint16(b[18:20], 0x0000)     // ack_nr
+	return append(b, payload...)
+}
+
+func TestSniffUTP(t *testing.T) {
+	selectiveAck := []byte{0, 4, 0xff, 0x00, 0xff, 0x00}
+	wrongVersion := utpPacket(4, 0, 0)
+	wrongVersion[0] = 4<<4 | 2
+
+	cases := []struct {
+		name    string
+		payload []byte
+		err     error
+	}{
+		{"syn", utpPacket(4, 0, 0), nil},
+		{"syn with selective ack", append(utpPacket(4, 1, 0), selectiveAck...), nil},
+		{"syn with extension bits", append(utpPacket(4, 2, 0), 0, 8, 1, 2, 3, 4, 5, 6, 7, 8), nil},
+		{"extension bits with wrong length", append(utpPacket(4, 2, 0), 0, 4, 1, 2, 3, 4), errNotBittorrent},
+		{"syn with nonzero timestamp_difference", utpPacket(4, 0, 0x1234), errNotBittorrent},
+		{"syn with trailing payload", utpPacket(4, 0, 0, 'x'), errNotBittorrent},
+		// txid 0x4100, no EDNS0: the worst case colliding with the uTP header
+		{"dns query", []byte{
+			0x41, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			0x01, 'a', 0x02, 'c', 'o', 0x00, 0x00, 0x01, 0x00, 0x01,
+		}, errNotBittorrent},
+		{"established connection packets", utpPacket(0, 0, 0x5678, 'x', 'y', 'z'), errNotBittorrent},
+		{"state", utpPacket(2, 0, 0x5678), errNotBittorrent},
+		{"fin", utpPacket(1, 0, 0x5678), errNotBittorrent},
+		{"wrong version", wrongVersion, errNotBittorrent},
+		{"unknown packet type", utpPacket(5, 0, 0), errNotBittorrent},
+		{"unknown extension", utpPacket(4, 2, 0), errNotBittorrent},
+		{"extension chain past the datagram", utpPacket(4, 1, 0, 0, 8, 0xff), errNotBittorrent},
+		{"selective ack not in multiples of 4", append(utpPacket(4, 1, 0), 0, 3, 0xff, 0x00, 0xff), errNotBittorrent},
+		{"shorter than the header", utpPacket(4, 0, 0)[:19], common.ErrNoClue},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			h, err := SniffUTP(c.payload)
+			if err != c.err {
+				t.Fatalf("expected error %v, got %v", c.err, err)
+			}
+			if err == nil && h == nil {
+				t.Fatal("expected a sniff header, got nil")
+			}
+		})
+	}
+}

common/protocol/http/sniff.go

@@ -1,13 +1,16 @@
 package http
 
 import (
+	"bufio"
 	"bytes"
 	"context"
 	"errors"
+	"io"
+	"net/http"
 	"strings"
+	"unsafe"
 
 	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
 )
 
@@ -39,79 +42,67 @@ func (h *SniffHeader) Domain() string {
 }
 
 var (
-	methods = [...]string{"get", "post", "head", "put", "delete", "options", "connect"}
-
-	errNotHTTPMethod = errors.New("not an HTTP method")
+	validMethods = map[string]bool{}
+	errNotHTTP   = errors.New("not an HTTP request")
 )
 
-func beginWithHTTPMethod(b []byte) error {
-	for _, m := range &methods {
-		if len(b) >= len(m) && strings.EqualFold(string(b[:len(m)]), m) {
-			return nil
-		}
-
-		if len(b) < len(m) {
-			return common.ErrNoClue
-		}
+func init() {
+	// https://www.iana.org/assignments/http-methods
+	methods := []string{
+		"ACL", "BASELINE-CONTROL", "BIND", "CHECKIN", "CHECKOUT",
+		"CONNECT", "COPY", "DELETE", "GET", "HEAD",
+		"LABEL", "LINK", "LOCK", "MERGE", "MKACTIVITY",
+		"MKCALENDAR", "MKCOL", "MKREDIRECTREF", "MKWORKSPACE", "MOVE",
+		"OPTIONS", "ORDERPATCH", "PATCH", "POST", "PRI",
+		"PROPFIND", "PROPPATCH", "PUT", "QUERY", "REBIND",
+		"REPORT", "SEARCH", "TRACE", "UNBIND", "UNCHECKOUT",
+		"UNLINK", "UNLOCK", "UPDATE", "UPDATEREDIRECTREF", "VERSION-CONTROL",
 	}
+	for _, m := range methods {
+		validMethods[m] = true
+	}
+}
 
-	return errNotHTTPMethod
+func isValidHTTPMethod(b []byte) bool {
+	if len(b) == 0 {
+		return false
+	}
+	idx := bytes.IndexByte(b, ' ')
+	if idx == -1 {
+		return false
+	}
+	method := unsafe.String(unsafe.SliceData(b), idx)
+	return validMethods[method]
 }
 
 func SniffHTTP(b []byte, c context.Context) (*SniffHeader, error) {
+	if !isValidHTTPMethod(b) {
+		return nil, errNotHTTP
+	}
 	content := session.ContentFromContext(c)
-	ShouldSniffAttr := true
-	// If content.Attributes have information, that means it comes from HTTP inbound PlainHTTP mode.
-	// It will set attributes, so skip it.
-	if content == nil || len(content.Attributes) != 0 {
-		ShouldSniffAttr = false
+	r, err := http.ReadRequest(bufio.NewReader(bytes.NewReader(b)))
+	if err != nil {
+		if err == io.ErrUnexpectedEOF {
+			return nil, common.ErrNoClue
+		}
+		return nil, errNotHTTP
 	}
-	if err := beginWithHTTPMethod(b); err != nil {
-		return nil, err
+	if r.Host == "" {
+		return nil, common.ErrNoClue
 	}
-
 	sh := &SniffHeader{
 		version: HTTP1,
+		host:    r.Host,
+	}
+	// If content.Attributes have information, that means it comes from HTTP inbound PlainHTTP mode.
+	// It will set attributes, so skip it.
+	if content != nil && len(content.Attributes) == 0 {
+		for key, h := range r.Header {
+			content.Attributes[key] = strings.Join(h, ",")
+		}
+		content.Attributes[":method"] = r.Method
+		content.Attributes[":path"] = r.URL.Path
 	}
 
-	headers := bytes.Split(b, []byte{'\n'})
-	for i := 1; i < len(headers); i++ {
-		header := headers[i]
-		if len(header) == 0 {
-			break
-		}
-		parts := bytes.SplitN(header, []byte{':'}, 2)
-		if len(parts) != 2 {
-			continue
-		}
-		key := strings.ToLower(string(parts[0]))
-		value := string(bytes.TrimSpace(parts[1]))
-		if ShouldSniffAttr {
-			content.SetAttribute(key, value) // Put header in attribute
-		}
-		if key == "host" {
-			rawHost := strings.ToLower(value)
-			dest, err := ParseHost(rawHost, net.Port(80))
-			if err != nil {
-				return nil, err
-			}
-			sh.host = dest.Address.String()
-		}
-	}
-	// Parse request line
-	// Request line is like this
-	// "GET /homo/114514 HTTP/1.1"
-	if len(headers) > 0 && ShouldSniffAttr {
-		RequestLineParts := bytes.Split(headers[0], []byte{' '})
-		if len(RequestLineParts) == 3 {
-			content.SetAttribute(":method", string(RequestLineParts[0]))
-			content.SetAttribute(":path", string(RequestLineParts[1]))
-		}
-	}
-
-	if len(sh.host) > 0 {
-		return sh, nil
-	}
-
-	return nil, common.ErrNoClue
+	return sh, nil
 }

common/protocol/http/sniff_test.go

@@ -14,75 +14,76 @@ func TestHTTPHeaders(t *testing.T) {
 		err    bool
 	}{
 		{
-			input: `GET /tutorials/other/top-20-mysql-best-practices/ HTTP/1.1
-Host: net.tutsplus.com
-User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)
-Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
-Accept-Language: en-us,en;q=0.5
-Accept-Encoding: gzip,deflate
-Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
-Keep-Alive: 300
-Connection: keep-alive
-Cookie: PHPSESSID=r2t5uvjq435r4q7ib3vtdjq120
-Pragma: no-cache
-Cache-Control: no-cache`,
+			input: "GET /tutorials/other/top-20-mysql-best-practices/ HTTP/1.1\r\n" +
+				"Host: net.tutsplus.com\r\n" +
+				"User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)\r\n" +
+				"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n" +
+				"Accept-Language: en-us,en;q=0.5\r\n" +
+				"Accept-Encoding: gzip,deflate\r\n" +
+				"Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n" +
+				"Keep-Alive: 300\r\n" +
+				"Connection: keep-alive\r\n" +
+				"Cookie: PHPSESSID=r2t5uvjq435r4q7ib3vtdjq120\r\n" +
+				"Pragma: no-cache\r\n" +
+				"Cache-Control: no-cache\r\n" +
+				"\r\n",
 			domain: "net.tutsplus.com",
 		},
 		{
-			input: `POST /foo.php HTTP/1.1
-Host: localhost
-User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)
-Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
-Accept-Language: en-us,en;q=0.5
-Accept-Encoding: gzip,deflate
-Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
-Keep-Alive: 300
-Connection: keep-alive
-Referer: http://localhost/test.php
-Content-Type: application/x-www-form-urlencoded
-Content-Length: 43
- 
-first_name=John&last_name=Doe&action=Submit`,
+			input: "POST /foo.php HTTP/1.1\r\n" +
+				"Host: localhost\r\n" +
+				"User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)\r\n" +
+				"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n" +
+				"Accept-Language: en-us,en;q=0.5\r\n" +
+				"Accept-Encoding: gzip,deflate\r\n" +
+				"Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n" +
+				"Keep-Alive: 300\r\n" +
+				"Connection: keep-alive\r\n" +
+				"Referer: http://localhost/test.php\r\n" +
+				"Content-Type: application/x-www-form-urlencoded\r\n" +
+				"Content-Length: 43\r\n" +
+				"\r\n" +
+				"first_name=John&last_name=Doe&action=Submit",
 			domain: "localhost",
 		},
 		{
-			input: `X /foo.php HTTP/1.1
-Host: localhost
-User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)
-Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
-Accept-Language: en-us,en;q=0.5
-Accept-Encoding: gzip,deflate
-Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
-Keep-Alive: 300
-Connection: keep-alive
-Referer: http://localhost/test.php
-Content-Type: application/x-www-form-urlencoded
-Content-Length: 43
- 
-first_name=John&last_name=Doe&action=Submit`,
+			input: "X /foo.php HTTP/1.1\r\n" +
+				"Host: localhost\r\n" +
+				"User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)\r\n" +
+				"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n" +
+				"Accept-Language: en-us,en;q=0.5\r\n" +
+				"Accept-Encoding: gzip,deflate\r\n" +
+				"Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n" +
+				"Keep-Alive: 300\r\n" +
+				"Connection: keep-alive\r\n" +
+				"Referer: http://localhost/test.php\r\n" +
+				"Content-Type: application/x-www-form-urlencoded\r\n" +
+				"Content-Length: 43\r\n" +
+				"\r\n" +
+				"first_name=John&last_name=Doe&action=Submit",
 			domain: "",
 			err:    true,
 		},
 		{
-			input: `GET /foo.php HTTP/1.1
-User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)
-Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
-Accept-Language: en-us,en;q=0.5
-Accept-Encoding: gzip,deflate
-Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
-Keep-Alive: 300
-Connection: keep-alive
-Referer: http://localhost/test.php
-Content-Type: application/x-www-form-urlencoded
-Content-Length: 43
-
-Host: localhost
-first_name=John&last_name=Doe&action=Submit`,
+			input: "GET /foo.php HTTP/1.1\r\n" +
+				"User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)\r\n" +
+				"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n" +
+				"Accept-Language: en-us,en;q=0.5\r\n" +
+				"Accept-Encoding: gzip,deflate\r\n" +
+				"Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n" +
+				"Keep-Alive: 300\r\n" +
+				"Connection: keep-alive\r\n" +
+				"Referer: http://localhost/test.php\r\n" +
+				"Content-Type: application/x-www-form-urlencoded\r\n" +
+				"Content-Length: 43\r\n" +
+				"\r\n" +
+				"Host: localhost\r\n" +
+				"first_name=John&last_name=Doe&action=Submit",
 			domain: "",
 			err:    true,
 		},
 		{
-			input:  `GET /tutorials/other/top-20-mysql-best-practices/ HTTP/1.1`,
+			input:  "GET /tutorials/other/top-20-mysql-best-practices/ HTTP/1.1\r\n",
 			domain: "",
 			err:    true,
 		},
@@ -97,6 +98,7 @@ first_name=John&last_name=Doe&action=Submit`,
 		} else {
 			if err != nil {
 				t.Errorf("Expect no error but actually %s in test %v", err.Error(), test)
+				continue
 			}
 			if header.Domain() != test.domain {
 				t.Error("expected domain ", test.domain, " but got ", header.Domain())

common/protocol/quic/qtls_go118.go

@@ -1,18 +1,10 @@
 package quic
 
 import (
-	"crypto"
 	"crypto/cipher"
 	_ "crypto/tls"
 	_ "unsafe"
 )
 
-type CipherSuiteTLS13 struct {
-	ID     uint16
-	KeyLen int
-	AEAD   func(key, fixedNonce []byte) cipher.AEAD
-	Hash   crypto.Hash
-}
-
 //go:linkname AEADAESGCMTLS13 crypto/tls.aeadAESGCMTLS13
 func AEADAESGCMTLS13(key, nonceMask []byte) cipher.AEAD

common/protocol/quic/sniff.go

@@ -3,7 +3,6 @@ package quic
 import (
 	"crypto"
 	"crypto/aes"
-	"crypto/tls"
 	"encoding/binary"
 	"io"
 
@@ -28,22 +27,43 @@ func (s SniffHeader) Domain() string {
 	return s.domain
 }
 
-const (
-	versionDraft29 uint32 = 0xff00001d
-	version1       uint32 = 0x1
+var (
+	errNotQUIC        = errors.New("not quic")
+	errNotQUICInitial = errors.New("not initial packet")
 )
 
+type quicVersionSpec struct {
+	ver         uint32
+	typeInitial byte
+	initialSalt []byte
+	labelPrefix string
+}
+
 var (
-	quicSaltOld  = []byte{0xaf, 0xbf, 0xec, 0x28, 0x99, 0x93, 0xd2, 0x4c, 0x9e, 0x97, 0x86, 0xf1, 0x9c, 0x61, 0x11, 0xe0, 0x43, 0x90, 0xa8, 0x99}
-	quicSalt     = []byte{0x38, 0x76, 0x2c, 0xf7, 0xf5, 0x59, 0x34, 0xb3, 0x4d, 0x17, 0x9a, 0xe6, 0xa4, 0xc8, 0x0c, 0xad, 0xcc, 0xbb, 0x7f, 0x0a}
-	initialSuite = &CipherSuiteTLS13{
-		ID:     tls.TLS_AES_128_GCM_SHA256,
-		KeyLen: 16,
-		AEAD:   AEADAESGCMTLS13,
-		Hash:   crypto.SHA256,
+	quicDraft29 = quicVersionSpec{
+		ver:         0xff00001d,
+		typeInitial: 0b00,
+		initialSalt: []byte{0xaf, 0xbf, 0xec, 0x28, 0x99, 0x93, 0xd2, 0x4c, 0x9e, 0x97, 0x86, 0xf1, 0x9c, 0x61, 0x11, 0xe0, 0x43, 0x90, 0xa8, 0x99},
+		labelPrefix: "quic",
+	}
+	quicV1 = quicVersionSpec{
+		ver:         0x1,
+		typeInitial: 0b00,
+		initialSalt: []byte{0x38, 0x76, 0x2c, 0xf7, 0xf5, 0x59, 0x34, 0xb3, 0x4d, 0x17, 0x9a, 0xe6, 0xa4, 0xc8, 0x0c, 0xad, 0xcc, 0xbb, 0x7f, 0x0a},
+		labelPrefix: "quic",
+	}
+	quicV2 = quicVersionSpec{
+		ver:         0x6b3343cf,
+		typeInitial: 0b01,
+		initialSalt: []byte{0x0d, 0xed, 0xe3, 0xde, 0xf7, 0x00, 0xa6, 0xdb, 0x81, 0x93, 0x81, 0xbe, 0x6e, 0x26, 0x9d, 0xcb, 0xf9, 0xbd, 0x2e, 0xd9},
+		labelPrefix: "quicv2",
+	}
+
+	quicVersionSpecMap = map[uint32]*quicVersionSpec{
+		quicDraft29.ver: &quicDraft29,
+		quicV1.ver:      &quicV1,
+		quicV2.ver:      &quicV2,
 	}
-	errNotQuic        = errors.New("not quic")
-	errNotQuicInitial = errors.New("not initial packet")
 )
 
 func SniffQUIC(b []byte) (*SniffHeader, error) {
@@ -63,60 +83,61 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 		buffer := buf.FromBytes(b)
 		typeByte, err := buffer.ReadByte()
 		if err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
 		isLongHeader := typeByte&0x80 > 0
 		if !isLongHeader || typeByte&0x40 == 0 {
-			return nil, errNotQuicInitial
+			return nil, errNotQUICInitial
 		}
 
 		vb, err := buffer.ReadBytes(4)
 		if err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
 		versionNumber := binary.BigEndian.Uint32(vb)
-		if versionNumber != 0 && typeByte&0x40 == 0 {
-			return nil, errNotQuic
-		} else if versionNumber != versionDraft29 && versionNumber != version1 {
-			return nil, errNotQuic
+		var s *quicVersionSpec
+		if v, ok := quicVersionSpecMap[versionNumber]; ok {
+			s = v
+		} else {
+			return nil, errNotQUIC
 		}
 
-		packetType := (typeByte & 0x30) >> 4
-		isQuicInitial := packetType == 0x0
-
 		var destConnID []byte
 		if l, err := buffer.ReadByte(); err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		} else if destConnID, err = buffer.ReadBytes(int32(l)); err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
 		if l, err := buffer.ReadByte(); err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		} else if common.Error2(buffer.ReadBytes(int32(l))) != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
-		if isQuicInitial { // Only initial packets have token, see https://datatracker.ietf.org/doc/html/rfc9000#section-17.2.2
-			tokenLen, err := readShortQuicVarint(buffer)
+		packetType := (typeByte & 0x30) >> 4
+		isQUICInitial := packetType == s.typeInitial
+
+		if isQUICInitial { // Only initial packets have token, see https://datatracker.ietf.org/doc/html/rfc9000#section-17.2.2
+			tokenLen, err := readShortQUICVarint(buffer)
 			if err != nil || tokenLen > int32(len(b)) {
-				return nil, errNotQuic
+				return nil, errNotQUIC
 			}
 
 			if _, err = buffer.ReadBytes(tokenLen); err != nil {
-				return nil, errNotQuic
+				return nil, errNotQUIC
 			}
 		}
 
-		packetLen, err := readShortQuicVarint(buffer)
+		packetLen, err := readShortQUICVarint(buffer)
 		if err != nil {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 		// packetLen is impossible to be shorter than this
 		if packetLen < 4 {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 
 		hdrLen := len(b) - int(buffer.Len())
@@ -125,26 +146,22 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 		}
 
 		restPayload := b[hdrLen+int(packetLen):]
-		if !isQuicInitial { // Skip this packet if it's not initial packet
+		if !isQUICInitial { // Skip this packet if it's not initial packet
 			b = restPayload
 			continue
 		}
 
-		var salt []byte
-		if versionNumber == version1 {
-			salt = quicSalt
-		} else {
-			salt = quicSaltOld
-		}
+		salt := s.initialSalt
+		label := s.labelPrefix
 		initialSecret := hkdf.Extract(crypto.SHA256.New, destConnID, salt)
-		secret := hkdfExpandLabel(crypto.SHA256, initialSecret, []byte{}, "client in", crypto.SHA256.Size())
-		hpKey := hkdfExpandLabel(initialSuite.Hash, secret, []byte{}, "quic hp", initialSuite.KeyLen)
+		secret := hkdfExpandLabel(initialSecret, "client in", crypto.SHA256.Size())
+		hpKey := hkdfExpandLabel(secret, label+" hp", 16)
 		block, err := aes.NewCipher(hpKey)
 		if err != nil {
 			return nil, err
 		}
 		if len(b) < hdrLen+4+block.BlockSize() {
-			return nil, errNotQuic
+			return nil, errNotQUIC
 		}
 		cache.Clear()
 		mask := cache.Extend(int32(block.BlockSize()))
@@ -155,8 +172,8 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 			b[hdrLen+i] ^= mask[i+1]
 		}
 
-		key := hkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic key", 16)
-		iv := hkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic iv", 12)
+		key := hkdfExpandLabel(secret, label+" key", 16)
+		iv := hkdfExpandLabel(secret, label+" iv", 12)
 		cipher := AEADAESGCMTLS13(key, iv)
 
 		nonce := cache.Extend(int32(cipher.NonceSize()))
@@ -181,44 +198,44 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 			case 0x00: // PADDING frame
 			case 0x01: // PING frame
 			case 0x02, 0x03: // ACK frame
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: Largest Acknowledged
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: Largest Acknowledged
 					return nil, io.ErrUnexpectedEOF
 				}
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: ACK Delay
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: ACK Delay
 					return nil, io.ErrUnexpectedEOF
 				}
-				ackRangeCount, err := readShortQuicVarint(buffer) // Field: ACK Range Count
+				ackRangeCount, err := readShortQUICVarint(buffer) // Field: ACK Range Count
 				if err != nil {
 					return nil, io.ErrUnexpectedEOF
 				}
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: First ACK Range
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: First ACK Range
 					return nil, io.ErrUnexpectedEOF
 				}
 				for i := 0; i < int(ackRangeCount); i++ { // Field: ACK Range
-					if _, err = readShortQuicVarint(buffer); err != nil { // Field: ACK Range -> Gap
+					if _, err = readShortQUICVarint(buffer); err != nil { // Field: ACK Range -> Gap
 						return nil, io.ErrUnexpectedEOF
 					}
-					if _, err = readShortQuicVarint(buffer); err != nil { // Field: ACK Range -> ACK Range Length
+					if _, err = readShortQUICVarint(buffer); err != nil { // Field: ACK Range -> ACK Range Length
 						return nil, io.ErrUnexpectedEOF
 					}
 				}
 				if frameType == 0x03 {
-					if _, err = readShortQuicVarint(buffer); err != nil { // Field: ECN Counts -> ECT0 Count
+					if _, err = readShortQUICVarint(buffer); err != nil { // Field: ECN Counts -> ECT0 Count
 						return nil, io.ErrUnexpectedEOF
 					}
-					if _, err = readShortQuicVarint(buffer); err != nil { // Field: ECN Counts -> ECT1 Count
+					if _, err = readShortQUICVarint(buffer); err != nil { // Field: ECN Counts -> ECT1 Count
 						return nil, io.ErrUnexpectedEOF
 					}
-					if _, err = readShortQuicVarint(buffer); err != nil { //nolint:misspell // Field: ECN Counts -> ECT-CE Count
+					if _, err = readShortQUICVarint(buffer); err != nil { //nolint:misspell // Field: ECN Counts -> ECT-CE Count
 						return nil, io.ErrUnexpectedEOF
 					}
 				}
 			case 0x06: // CRYPTO frame, we will use this frame
-				offset, err := readShortQuicVarint(buffer) // Field: Offset
+				offset, err := readShortQUICVarint(buffer) // Field: Offset
 				if err != nil {
 					return nil, io.ErrUnexpectedEOF
 				}
-				length, err := readShortQuicVarint(buffer) // Field: Length
+				length, err := readShortQUICVarint(buffer) // Field: Length
 				if err != nil || length > buffer.Len() {
 					return nil, io.ErrUnexpectedEOF
 				}
@@ -234,13 +251,13 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 					return nil, io.ErrUnexpectedEOF
 				}
 			case 0x1c: // CONNECTION_CLOSE frame, only 0x1c is permitted in initial packet
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: Error Code
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: Error Code
 					return nil, io.ErrUnexpectedEOF
 				}
-				if _, err = readShortQuicVarint(buffer); err != nil { // Field: Frame Type
+				if _, err = readShortQUICVarint(buffer); err != nil { // Field: Frame Type
 					return nil, io.ErrUnexpectedEOF
 				}
-				length, err := readShortQuicVarint(buffer) // Field: Reason Phrase Length
+				length, err := readShortQUICVarint(buffer) // Field: Reason Phrase Length
 				if err != nil {
 					return nil, io.ErrUnexpectedEOF
 				}
@@ -250,7 +267,7 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 			default:
 				// Only above frame types are permitted in initial packet.
 				// See https://www.rfc-editor.org/rfc/rfc9000.html#section-17.2.2-8
-				return nil, errNotQuicInitial
+				return nil, errNotQUICInitial
 			}
 		}
 
@@ -268,35 +285,33 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
 	return nil, protocol.ErrProtoNeedMoreData
 }
 
-func hkdfExpandLabel(hash crypto.Hash, secret, context []byte, label string, length int) []byte {
-	b := make([]byte, 3, 3+6+len(label)+1+len(context))
-	binary.BigEndian.PutUint16(b, uint16(length))
-	b[2] = uint8(6 + len(label))
-	b = append(b, []byte("tls13 ")...)
-	b = append(b, []byte(label)...)
-	b = b[:3+6+len(label)+1]
-	b[3+6+len(label)] = uint8(len(context))
-	b = append(b, context...)
+func hkdfExpandLabel(secret []byte, label string, length int) []byte {
+	b := make([]byte, 0, 2+1+6+len(label)+1)
+	b = binary.BigEndian.AppendUint16(b, uint16(length))
+	b = append(b, byte(6+len(label)))
+	b = append(b, "tls13 "...)
+	b = append(b, label...)
+	b = append(b, 0) // context
 
 	out := make([]byte, length)
-	n, err := hkdf.Expand(hash.New, secret, b).Read(out)
+	n, err := hkdf.Expand(crypto.SHA256.New, secret, b).Read(out)
 	if err != nil || n != length {
 		panic("quic: HKDF-Expand-Label invocation failed unexpectedly")
 	}
 	return out
 }
 
-// readShortQuicVarint wraps quicvarint.Read with a max limit for length related fields.
+// readShortQUICVarint wraps quicvarint.Read with a max limit for length related fields.
 // we only handle QUIC Initial so these numbers should not exceed 65535
 // returns int32 to reduce type conversion
-func readShortQuicVarint(reader io.ByteReader) (int32, error) {
+func readShortQUICVarint(reader io.ByteReader) (int32, error) {
 	v, err := quicvarint.Read(reader)
 	if err != nil {
 		return 0, err
 	}
 	if v > 65535 {
 		// not used(
-		return 0, errNotQuicInitial
+		return 0, errNotQUICInitial
 	}
 	return int32(v), nil
 }

common/reflect/marshal_test.go

@@ -207,6 +207,7 @@ func getConfig() string {
       "tag": "XHTTP_IN",
       "streamSettings": {
         "network": "xhttp",
+		"security": "tls",
         "xhttpSettings": {
           "host": "bing.com",
           "path": "/xhttp_client_upload",

go.mod

@@ -3,36 +3,37 @@ module github.com/xtls/xray-core
 go 1.26
 
 require (
-	github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716
-	github.com/cloudflare/circl v1.6.4
+	github.com/apernet/quic-go v0.61.1-0.20260806010916-184d081eef3e
+	github.com/cloudflare/circl v1.6.5
 	github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344
 	github.com/golang/mock v1.7.0-rc.1
 	github.com/google/go-cmp v0.7.0
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/websocket v1.5.3
 	github.com/klauspost/cpuid/v2 v2.4.0
-	github.com/miekg/dns v1.1.72
+	github.com/libp2p/go-nat v1.0.1-0.20250821073202-01afc089f138
+	github.com/miekg/dns v1.1.73
 	github.com/pelletier/go-toml v1.9.5
-	github.com/pion/stun/v3 v3.1.6
+	github.com/pion/stun/v3 v3.1.7
 	github.com/pires/go-proxyproto v0.15.0
 	github.com/refraction-networking/utls v1.8.3-0.20260301010127-aa6edf4b11af
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/sagernet/sing v0.5.1
 	github.com/sagernet/sing-shadowsocks v0.2.7
-	github.com/stretchr/testify v1.11.1
+	github.com/stretchr/testify v1.12.1
 	github.com/vishvananda/netlink v1.3.1
 	github.com/xtls/reality v0.0.0-20260322125925-9234c772ba8f
 	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba
-	golang.org/x/crypto v0.54.0
+	golang.org/x/crypto v0.55.0
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
-	golang.org/x/net v0.57.0
+	golang.org/x/net v0.58.0
 	golang.org/x/sync v0.22.0
 	golang.org/x/sys v0.47.0
 	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2
 	golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb
 	golang.zx2c4.com/wireguard/windows v1.0.1
-	google.golang.org/grpc v1.82.1
-	google.golang.org/protobuf v1.36.11
+	google.golang.org/grpc v1.83.1
+	google.golang.org/protobuf v1.36.12
 	gvisor.dev/gvisor v0.0.0-20260122175437-89a5d21be8f0
 	h12.io/socks v1.0.3
 	lukechampine.com/blake3 v1.4.1
@@ -40,23 +41,24 @@ require (
 
 require (
 	github.com/andybalholm/brotli v1.0.6 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/google/btree v1.1.2 // indirect
+	github.com/google/gopacket v1.1.19 // indirect
+	github.com/huin/goupnp v1.2.0 // indirect
+	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
 	github.com/juju/ratelimit v1.0.2 // indirect
 	github.com/klauspost/compress v1.17.4 // indirect
+	github.com/koron/go-ssdp v0.0.4 // indirect
 	github.com/kr/text v0.2.0 // indirect
-	github.com/pion/dtls/v3 v3.1.4 // indirect
+	github.com/libp2p/go-netroute v0.2.1 // indirect
+	github.com/pion/dtls/v3 v3.1.5 // indirect
 	github.com/pion/logging v0.2.4 // indirect
-	github.com/pion/transport/v4 v4.0.2 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/pion/transport/v4 v4.1.0 // indirect
 	github.com/quic-go/qpack v0.6.0 // indirect
 	github.com/vishvananda/netns v0.0.5 // indirect
 	github.com/wlynxg/anet v0.0.5 // indirect
-	golang.org/x/mod v0.37.0 // indirect
-	golang.org/x/text v0.40.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.5 // indirect
+	golang.org/x/text v0.41.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
-	golang.org/x/tools v0.47.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,14 +1,12 @@
 github.com/andybalholm/brotli v1.0.6 h1:Yf9fFpf49Zrxb9NlQaluyE92/+X7UVHlhMNJN2sxfOI=
 github.com/andybalholm/brotli v1.0.6/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
-github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716 h1:J1O+xpLuJWkdYbw5JPGwBqIHs2J8tiEP7Py9lPqkN2I=
-github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716/go.mod h1:Npbg8qBtAZlsAB3FWmqwlVh5jtVG6a4DlYsOylUpvzA=
+github.com/apernet/quic-go v0.61.1-0.20260806010916-184d081eef3e h1:5mgtR5gwIgBKMiGI1QdXldZZ+SNor06Nbu1wCBulQBg=
+github.com/apernet/quic-go v0.61.1-0.20260806010916-184d081eef3e/go.mod h1:x7qxEvX6MCVtDuBKHj3E+88+BtrbEMuAL5qGUKItjW8=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cloudflare/circl v1.6.4 h1:pOXuDTCEYyzydgUpQ0CQz3LsinKjiSk6nNP5Lt5K64U=
-github.com/cloudflare/circl v1.6.4/go.mod h1:YxarevkLlbaHuWsxG6vmYNWBEsSp4pnp7j+4VljMavY=
+github.com/cloudflare/circl v1.6.5 h1:O64F26HEqNhznd/hrC5KZXVKYuKM2rx4deZDTc4ihQA=
+github.com/cloudflare/circl v1.6.5/go.mod h1:h5LNyxAc5nTue9DS5jT+48en2PSDYt3zdGnz5OstK6c=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344 h1:Arcl6UOIS/kgO2nW3A65HN+7CMjSDP/gofXL4CZt1V4=
 github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344/go.mod h1:GIjDIg/heH5DOkXY3YJ/wNhfHsQHoXGjl8G8amsYQ1I=
 github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
@@ -23,40 +21,52 @@ github.com/google/btree v1.1.2 h1:xf4v41cLI2Z6FxbKm+8Bu+m8ifhj15JuZ9sa0jZCMUU=
 github.com/google/btree v1.1.2/go.mod h1:qOPhT0dTNdNzV6Z/lhRX0YXUafgPLFUh+gZMl761Gm4=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
+github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8=
+github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo/Vo+TKTo=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364 h1:5XxdakFhqd9dnXoAZy1Mb2R/DZ6D1e+0bGC/JhucGYI=
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@@ -69,8 +79,8 @@ github.com/sagernet/sing v0.5.1 h1:mhL/MZVq0TjuvHcpYcFtmSD1BFOxZ/+8ofbNZcg1k1Y=
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@@ -82,34 +92,36 @@ github.com/xtls/reality v0.0.0-20260322125925-9234c772ba8f/go.mod h1:DsJblcWDGt7
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -147,20 +158,18 @@ golang.zx2c4.com/wireguard/windows v1.0.1 h1:eOxiDVbywPC+ZQqvdCK7x+ZwWXKbYv50TtH
 golang.zx2c4.com/wireguard/windows v1.0.1/go.mod h1:+fbT3FFdX4zzYDLwJh5+HPEcNN/3HyNdzhNSVsQM+zs=
 gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
 gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 h1:RmoJA1ujG+/lRGNfUnOMfhCy5EipVMyvUE+KNbPbTlw=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.82.1 h1:NnAxzGRA0677vCa4BUkOAnO5+FfQqVl9iUXeD0IqcGE=
-google.golang.org/grpc v1.82.1/go.mod h1:yzTZ1TB1Z3SG+LIYaI+WiE8D5+PZ3ArnrSp8zF3+/ZA=
-google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
-google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa h1:mZHHdPZl0dbGHCflZgAq/Q468DWVFcU2whhB2KAo8fk=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/grpc v1.83.1 h1:HIO0+BEtBP6soyqvqC8sNUjZ7bTs+0hFQuFF+RAy++Y=
+google.golang.org/grpc v1.83.1/go.mod h1:kDyl6SKsiHKt0uylY5gtn5cEjkrIOhQOGDgIc4JGwzQ=
+google.golang.org/protobuf v1.36.12 h1:pJOKDDOyeXErUroCihFAd5LQuwXBSpVnKGrj5o/fwxc=
+google.golang.org/protobuf v1.36.12/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gvisor.dev/gvisor v0.0.0-20260122175437-89a5d21be8f0 h1:Lk6hARj5UPY47dBep70OD/TIMwikJ5fGUGX0Rm3Xigk=
 gvisor.dev/gvisor v0.0.0-20260122175437-89a5d21be8f0/go.mod h1:QkHjoMIBaYtpVufgwv3keYAbln78mBoCuShZrPrer1Q=
 h12.io/socks v1.0.3 h1:Ka3qaQewws4j4/eDQnOdpr4wXsC//dXtWvftlIcCQUo=

infra/conf/common.go

@@ -65,6 +65,9 @@ func (v *Address) UnmarshalJSON(data []byte) error {
 }
 
 func (v *Address) Build() *net.IPOrDomain {
+	if v == nil {
+		return nil
+	}
 	return net.NewIPOrDomain(v.Address)
 }
 

infra/conf/observatory.go

@@ -23,7 +23,7 @@ func (o *ObservatoryConfig) Build() (proto.Message, error) {
 type BurstObservatoryConfig struct {
 	SubjectSelector []string `json:"subjectSelector"`
 	// health check settings
-	HealthCheck *healthCheckSettings `json:"pingConfig,omitempty"`
+	HealthCheck *HealthCheckSettings `json:"pingConfig,omitempty"`
 }
 
 func (b BurstObservatoryConfig) Build() (proto.Message, error) {

infra/conf/router.go

@@ -148,6 +148,7 @@ func parseFieldRule(msg json.RawMessage) (*router.RoutingRule, error) {
 		LocalIP    *StringList        `json:"localIP"`
 		LocalPort  *PortList          `json:"localPort"`
 		Process    *StringList        `json:"process"`
+		LocalOS    *StringList        `json:"localOS"`
 		Webhook    *WebhookRuleConfig `json:"webhook"`
 	}
 	rawFieldRule := new(RawFieldRule)
@@ -261,6 +262,10 @@ func parseFieldRule(msg json.RawMessage) (*router.RoutingRule, error) {
 		rule.Process = *rawFieldRule.Process
 	}
 
+	if rawFieldRule.LocalOS != nil && len(*rawFieldRule.LocalOS) > 0 {
+		rule.LocalOs = *rawFieldRule.LocalOS
+	}
+
 	if rawFieldRule.Webhook != nil && rawFieldRule.Webhook.URL != "" {
 		rule.Webhook = &router.WebhookConfig{
 			Url:           rawFieldRule.Webhook.URL,

infra/conf/router_strategy.go

@@ -43,8 +43,8 @@ type strategyLeastLoadConfig struct {
 	Tolerance float64 `json:"tolerance,omitempty"`
 }
 
-// healthCheckSettings holds settings for health Checker
-type healthCheckSettings struct {
+// HealthCheckSettings holds settings for health Checker
+type HealthCheckSettings struct {
 	Destination   string            `json:"destination"`
 	Connectivity  string            `json:"connectivity"`
 	Interval      duration.Duration `json:"interval"`
@@ -53,7 +53,7 @@ type healthCheckSettings struct {
 	HttpMethod    string            `json:"httpMethod"`
 }
 
-func (h healthCheckSettings) Build() (proto.Message, error) {
+func (h HealthCheckSettings) Build() (proto.Message, error) {
 	var httpMethod string
 	if h.HttpMethod == "" {
 		httpMethod = "HEAD"

infra/conf/transport_finalmask.go

@@ -816,9 +816,11 @@ func (c *Xicmp) Build() (proto.Message, error) {
 }
 
 type Realm struct {
-	Url         string     `json:"url"`
-	StunServers []string   `json:"stunServers"`
-	TlsConfig   *TLSConfig `json:"tlsConfig"`
+	Url         string             `json:"url"`
+	StunServers []string           `json:"stunServers"`
+	TlsConfig   *TLSConfig         `json:"tlsConfig"`
+	IPMode      string             `json:"ipMode"`
+	PortMapping *realm.PortMapping `json:"portMapping"`
 }
 
 func (c *Realm) Build() (proto.Message, error) {
@@ -898,6 +900,8 @@ func (c *Realm) Build() (proto.Message, error) {
 		ID:          id,
 		StunServers: stunServers,
 		TlsConfig:   tlsConfig,
+		IPMode:      strings.ToLower(c.IPMode),
+		PortMapping: c.PortMapping,
 	}, nil
 }
 
@@ -928,20 +932,24 @@ func (c *Mask) Build(tcp bool) (proto.Message, error) {
 }
 
 type QuicParamsConfig struct {
-	Congestion                  string    `json:"congestion"`
-	Debug                       bool      `json:"debug"`
-	BbrProfile                  string    `json:"bbrProfile"`
-	BrutalUp                    Bandwidth `json:"brutalUp"`
-	BrutalDown                  Bandwidth `json:"brutalDown"`
-	UdpHop                      UdpHop    `json:"udpHop"`
-	InitStreamReceiveWindow     uint64    `json:"initStreamReceiveWindow"`
-	MaxStreamReceiveWindow      uint64    `json:"maxStreamReceiveWindow"`
-	InitConnectionReceiveWindow uint64    `json:"initConnectionReceiveWindow"`
-	MaxConnectionReceiveWindow  uint64    `json:"maxConnectionReceiveWindow"`
-	MaxIdleTimeout              int64     `json:"maxIdleTimeout"`
-	KeepAlivePeriod             int64     `json:"keepAlivePeriod"`
-	DisablePathMTUDiscovery     bool      `json:"disablePathMTUDiscovery"`
-	MaxIncomingStreams          int64     `json:"maxIncomingStreams"`
+	Congestion                    string    `json:"congestion"`
+	Debug                         bool      `json:"debug"`
+	BbrProfile                    string    `json:"bbrProfile"`
+	BrutalUp                      Bandwidth `json:"brutalUp"`
+	BrutalDown                    Bandwidth `json:"brutalDown"`
+	BrutalDisableLossCompensation bool      `json:"brutalDisableLossCompensation"`
+	UdpHop                        UdpHop    `json:"udpHop"`
+	InitStreamReceiveWindow       uint64    `json:"initStreamReceiveWindow"`
+	MaxStreamReceiveWindow        uint64    `json:"maxStreamReceiveWindow"`
+	InitConnectionReceiveWindow   uint64    `json:"initConnectionReceiveWindow"`
+	MaxConnectionReceiveWindow    uint64    `json:"maxConnectionReceiveWindow"`
+	MaxIdleTimeout                int64     `json:"maxIdleTimeout"`
+	KeepAlivePeriod               int64     `json:"keepAlivePeriod"`
+	DisablePathMTUDiscovery       bool      `json:"disablePathMTUDiscovery"`
+	DisableChromeParrot           bool      `json:"disableChromeParrot"`
+	DisableGSO                    bool      `json:"disableGSO"`
+	MaxIncomingStreams            int64     `json:"maxIncomingStreams"`
+	DisableStatelessReset         bool      `json:"disableStatelessReset"`
 }
 
 type FinalMask struct {

infra/conf/transport_internet.go

@@ -285,10 +285,11 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 			}
 
 			config.QuicParams = &internet.QuicParams{
-				Congestion: c.FinalMask.QuicParams.Congestion,
-				BbrProfile: profile,
-				BrutalUp:   up,
-				BrutalDown: down,
+				Congestion:                    c.FinalMask.QuicParams.Congestion,
+				BbrProfile:                    profile,
+				BrutalUp:                      up,
+				BrutalDown:                    down,
+				BrutalDisableLossCompensation: c.FinalMask.QuicParams.BrutalDisableLossCompensation,
 				UdpHop: &internet.UdpHop{
 					Ports:       c.FinalMask.QuicParams.UdpHop.PortList.Build().Ports(),
 					IntervalMin: int64(c.FinalMask.QuicParams.UdpHop.Interval.From),
@@ -301,7 +302,10 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 				MaxIdleTimeout:          c.FinalMask.QuicParams.MaxIdleTimeout,
 				KeepAlivePeriod:         c.FinalMask.QuicParams.KeepAlivePeriod,
 				DisablePathMtuDiscovery: c.FinalMask.QuicParams.DisablePathMTUDiscovery,
+				DisableChromeParrot:     c.FinalMask.QuicParams.DisableChromeParrot,
+				DisableGSO:              c.FinalMask.QuicParams.DisableGSO,
 				MaxIncomingStreams:      c.FinalMask.QuicParams.MaxIncomingStreams,
+				DisableStatelessReset:   c.FinalMask.QuicParams.DisableStatelessReset,
 			}
 		}
 	}

infra/conf/transport_method.go

@@ -751,6 +751,7 @@ type Masquerade struct {
 
 	Url         string `json:"url"`
 	RewriteHost bool   `json:"rewriteHost"`
+	XForwarded  bool   `json:"xForwarded"`
 	Insecure    bool   `json:"insecure"`
 
 	Content    string            `json:"content"`
@@ -791,6 +792,7 @@ func (c *HysteriaConfig) Build() (proto.Message, error) {
 	config.MasqFile = c.Masquerade.Dir
 	config.MasqUrl = c.Masquerade.Url
 	config.MasqUrlRewriteHost = c.Masquerade.RewriteHost
+	config.MasqUrlXForwarded = c.Masquerade.XForwarded
 	config.MasqUrlInsecure = c.Masquerade.Insecure
 	config.MasqString = c.Masquerade.Content
 	config.MasqStringHeaders = c.Masquerade.Headers

infra/conf/transport_sockopt.go

@@ -10,7 +10,7 @@ import (
 )
 
 type CustomSockoptConfig struct {
-	System  string `json:"system"`
+	Syetem  string `json:"system"`
 	Network string `json:"network"`
 	Level   string `json:"level"`
 	Opt     string `json:"opt"`
@@ -124,7 +124,7 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 
 	for _, copt := range c.CustomSockopt {
 		customSockopt := &internet.CustomSockopt{
-			System:  copt.System,
+			System:  copt.Syetem,
 			Network: copt.Network,
 			Level:   copt.Level,
 			Opt:     copt.Opt,

infra/conf/wireguard.go

@@ -66,6 +66,7 @@ type WireGuardConfig struct {
 	MTU            int32                  `json:"mtu"`
 	Reserved       []byte                 `json:"reserved"`
 	DomainStrategy string                 `json:"domainStrategy"`
+	DNS            []string               `json:"remoteDNS"`
 }
 
 func (c *WireGuardConfig) Build() (proto.Message, error) {
@@ -141,6 +142,7 @@ func (c *WireGuardConfig) Build() (proto.Message, error) {
 
 	config.IsClient = c.IsClient
 	config.NoKernelTun = c.NoKernelTun
+	config.DNS = c.DNS
 
 	return config, nil
 }

infra/conf/xray.go

@@ -140,7 +140,7 @@ func (c *InboundDetourConfig) Build() (*core.InboundHandlerConfig, error) {
 	// TUN inbound doesn't need port configuration as it uses network interface instead
 	if strings.ToLower(c.Protocol) == "tun" {
 		// Skip port validation for TUN
-	} else if c.ListenOn == nil {
+	} else if c.ListenOn == nil || len(c.ListenOn.String()) == 0 {
 		// Listen on anyip, must set PortList
 		if c.PortList == nil {
 			return nil, errors.New("Listen on AnyIP but no Port(s) set in InboundDetour.")
@@ -251,13 +251,13 @@ func validateOutboundTransportSecurity(rawConfig interface{}, senderSettings *pr
 		if vlessCfg.Encryption != "" && vlessCfg.Encryption != "none" {
 			return nil
 		}
-		if requiresTransportSecurity(vlessCfg.Address) {
+		if requiresTransportSecurity(vlessCfg.Vnext[0].Address) {
 			return errors.New("vless without TLS or other encryption is prohibited unless the server address is a private IP or domain")
 		}
 	}
 
 	if tjCfg, ok := rawConfig.(*TrojanClientConfig); ok {
-		if requiresTransportSecurity(tjCfg.Address) {
+		if requiresTransportSecurity(tjCfg.Servers[0].Address) {
 			return errors.New("trojan without TLS is prohibited unless the server address is a private IP or domain")
 		}
 	}
@@ -358,13 +358,13 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 	if err != nil {
 		return nil, errors.New("failed to load outbound detour config for protocol ", c.Protocol).Base(err)
 	}
-	if err := validateOutboundTransportSecurity(rawConfig, senderSettings); err != nil {
-		return nil, err
-	}
 	ts, err := rawConfig.(Buildable).Build()
 	if err != nil {
 		return nil, errors.New("failed to build outbound handler for protocol ", c.Protocol).Base(err)
 	}
+	if err := validateOutboundTransportSecurity(rawConfig, senderSettings); err != nil {
+		return nil, err
+	}
 
 	return &core.OutboundHandlerConfig{
 		SenderSettings: serial.ToTypedMessage(senderSettings),

proxy/dokodemo/fakeudp_openbsd.go

@@ -0,0 +1,78 @@
+//go:build openbsd
+// +build openbsd
+
+package dokodemo
+
+import (
+	"fmt"
+	"net"
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+func FakeUDP(addr *net.UDPAddr, mark int) (net.PacketConn, error) {
+	domain := unix.AF_INET6
+	var sockaddr unix.Sockaddr
+	if ip4 := addr.IP.To4(); ip4 != nil {
+		domain = unix.AF_INET
+		sa := &unix.SockaddrInet4{Port: addr.Port}
+		copy(sa.Addr[:], ip4)
+		sockaddr = sa
+	} else if ip6 := addr.IP.To16(); ip6 != nil {
+		sa := &unix.SockaddrInet6{Port: addr.Port}
+		copy(sa.Addr[:], ip6)
+		if addr.Zone != "" {
+			iface, err := net.InterfaceByName(addr.Zone)
+			if err != nil {
+				return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("resolve zone %s: %w", addr.Zone, err)}
+			}
+			sa.ZoneId = uint32(iface.Index)
+		}
+		sockaddr = sa
+	} else {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("unsupported address %v", addr.IP)}
+	}
+
+	fd, err := unix.Socket(domain, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("socket open: %w", err)}
+	}
+
+	closeFD := true
+	defer func() {
+		if closeFD {
+			unix.Close(fd)
+		}
+	}()
+
+	if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_BINDANY, 1); err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option SO_BINDANY: %w", err)}
+	}
+	if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1); err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option SO_REUSEADDR: %w", err)}
+	}
+	// Several client sessions can be answered from the same original
+	// destination at the same time, so the address has to be shareable.
+	if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option SO_REUSEPORT: %w", err)}
+	}
+
+	if err = unix.Bind(fd, sockaddr); err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("bind %s: %w", addr.String(), err)}
+	}
+
+	fdFile := os.NewFile(uintptr(fd), fmt.Sprintf("net-udp-bindany-%s", addr.String()))
+	if fdFile == nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("convert descriptor to file")}
+	}
+	defer fdFile.Close()
+
+	packetConn, err := net.FilePacketConn(fdFile)
+	if err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("convert descriptor to packet connection: %w", err)}
+	}
+
+	closeFD = false
+	return packetConn, nil
+}

proxy/dokodemo/fakeudp_other.go

@@ -1,5 +1,5 @@
-//go:build !linux
-// +build !linux
+//go:build !linux && !openbsd
+// +build !linux,!openbsd
 
 package dokodemo
 

proxy/http/client.go

@@ -173,15 +173,18 @@ func fillRequestHeader(ctx context.Context, header []*Header) ([]*Header, error)
 	outbounds := session.OutboundsFromContext(ctx)
 	ob := outbounds[len(outbounds)-1]
 
-	if inbound == nil || ob == nil {
-		return nil, errors.New("missing inbound or outbound metadata from context")
+	var src net.Destination
+	if inbound != nil {
+		src = inbound.Source
+	} else {
+		src = net.TCPDestination(net.AnyIP, 0)
 	}
 
 	data := struct {
 		Source net.Destination
 		Target net.Destination
 	}{
-		Source: inbound.Source,
+		Source: src,
 		Target: ob.Target,
 	}
 

proxy/tun/tun_darwin.go

@@ -11,6 +11,8 @@ import (
 	"os"
 	"strconv"
 	"sync"
+	"sync/atomic"
+	"time"
 	"unsafe"
 
 	"github.com/xtls/xray-core/common/buf"
@@ -38,21 +40,111 @@ const (
 	ND6_INFINITE_LIFETIME = 0xFFFFFFFF // netinet6/nd6.h
 )
 
-//go:linkname procyield runtime.procyield
-func procyield(cycles uint32)
-
 type DarwinTun struct {
 	tunFile *os.File
 	options *Config
 	tunFd   int
 	ownsFd  bool // true for macOS (we created the fd), false for iOS (fd from system)
 
+	// Genuinely blocks Wait() until tunFd is readable, instead of the
+	// previous procyield-only busy-spin (dispatchLoop in
+	// stack_gvisor_endpoint.go calls ReadPacket() then Wait() in a tight
+	// loop with no other throttling whenever the queue is empty -- with
+	// only procyield(1), that pins a full CPU core for as long as the
+	// tunnel is up, observed causing severe device heating/thermal
+	// shutdown). nil if kqueue setup failed, in which case Wait() falls
+	// back to a bounded time.Sleep instead. See waitKqueue's own doc
+	// comment for why this is a dedicated type rather than a bare fd.
+	waitKq *waitKqueue
+
 	routeMonitor     *os.File
 	routeMonitorOnce sync.Once
 	systemRoutes     []netip.Prefix
 	gateway          netip.Prefix
 }
 
+// waitKqueue owns a kqueue fd used by DarwinTun.Wait() to block on
+// read-readiness. Closing and waiting can race from different goroutines
+// (Close() from the caller that tears down the tunnel, Wait() from
+// dispatchLoop's own goroutine) -- reviewer feedback on XTLS/Xray-core#6580
+// found that a bare `int` fd field let Close() race Wait()'s use of the
+// same fd number, and on Darwin a closed fd number can be reused by an
+// unrelated concurrent open() before Wait() gets to call Kevent on it,
+// so Wait() could end up polling (or Close() could end up closing) a
+// completely unrelated file descriptor. This type makes closing
+// idempotent (sync.Once) and gates every Kevent call behind an atomic
+// "closed" flag checked immediately before the syscall, so Wait() never
+// issues a kevent syscall against a fd number that Close() has already
+// (or is concurrently) invalidated -- there's still a narrow window where
+// Wait() checks-then-uses the fd, but Close() only actually closes it
+// after Wait() cannot start a new syscall on it (the flag is set first,
+// synchronized with acquire/release semantics), which is sufficient since
+// Wait()'s Kevent call itself is what's being raced, not a fd read/write.
+type waitKqueue struct {
+	fd     int
+	closed atomic.Bool
+	once   sync.Once
+}
+
+// newWaitKqueue creates a kqueue registered for read-readiness on fd, for
+// Wait() to block on. Returns nil if anything fails, so callers can fall
+// back to a bounded sleep rather than error out of NewTun over what is
+// purely a CPU-efficiency concern.
+func newWaitKqueue(fd int) *waitKqueue {
+	kq, err := unix.Kqueue()
+	if err != nil {
+		return nil
+	}
+	_, err = unix.Kevent(kq, []unix.Kevent_t{{
+		Ident:  uint64(fd),
+		Filter: unix.EVFILT_READ,
+		Flags:  unix.EV_ADD | unix.EV_ENABLE,
+	}}, nil, nil)
+	if err != nil {
+		_ = unix.Close(kq)
+		return nil
+	}
+	return &waitKqueue{fd: kq}
+}
+
+// wait blocks until the registered fd is readable, timeout elapses, or a
+// benign interrupt occurs -- all three are "this kqueue is still healthy,
+// the caller should just try again" and return true; the caller
+// (DarwinTun.Wait) doesn't need to distinguish them since it always calls
+// ReadPacket() right after anyway, and that already handles "nothing was
+// actually there" via ErrQueueEmpty. Returns false only when the kqueue
+// itself is no longer usable -- already closed, or the kevent syscall
+// failed for a reason other than EINTR -- see its own call site in
+// DarwinTun.Wait for why a persistent failure must not be silently
+// retried forever (reviewer feedback, XTLS/Xray-core#6580 P2).
+func (w *waitKqueue) wait(timeout time.Duration) (ok bool) {
+	if w.closed.Load() {
+		return false
+	}
+	events := make([]unix.Kevent_t, 1)
+	ts := unix.NsecToTimespec(timeout.Nanoseconds())
+	_, err := unix.Kevent(w.fd, nil, events, &ts)
+	if err != nil {
+		return errors.Is(err, unix.EINTR)
+	}
+	return true
+}
+
+// close marks the kqueue as unusable (so any Wait() call that hasn't yet
+// entered the kevent syscall bails out instead) and closes the underlying
+// fd exactly once, regardless of how many times close is called or
+// whether it races a Wait() already inside its kevent syscall (that call
+// either completes against the still-open fd or returns an error safely
+// -- either way, no other goroutine can be handed this fd number in
+// between the atomic flag flip and the actual close, since nothing else
+// in this type ever creates a new kqueue with the same field).
+func (w *waitKqueue) close() {
+	w.once.Do(func() {
+		w.closed.Store(true)
+		_ = unix.Close(w.fd)
+	})
+}
+
 var (
 	_ Tun          = (*DarwinTun)(nil)
 	_ GVisorDevice = (*DarwinTun)(nil)
@@ -77,6 +169,7 @@ func NewTun(options *Config) (Tun, error) {
 			options: options,
 			tunFd:   fd,
 			ownsFd:  false,
+			waitKq:  newWaitKqueue(fd),
 		}, nil
 	}
 
@@ -103,6 +196,7 @@ func NewTun(options *Config) (Tun, error) {
 		options: options,
 		tunFd:   int(tunFile.Fd()),
 		ownsFd:  true,
+		waitKq:  newWaitKqueue(int(tunFile.Fd())),
 		gateway: gateway,
 	}, nil
 }
@@ -134,6 +228,9 @@ func (t *DarwinTun) Close() error {
 			_ = t.routeMonitor.Close()
 		}
 	})
+	if t.waitKq != nil {
+		t.waitKq.close()
+	}
 	routeErr := t.unsetSystemRoutes()
 	if t.ownsFd {
 		return xerrors.Combine(routeErr, t.tunFile.Close())
@@ -242,9 +339,43 @@ func (t *DarwinTun) ReadPacket() (byte, *stack.PacketBuffer, error) {
 	}), nil
 }
 
-// Wait some cpu cycles
+// Wait blocks until tunFd is readable (or a short timeout elapses), rather
+// than spinning the CPU -- see the waitKq field's own doc comment. A bounded
+// timeout (not an indefinite wait) keeps this responsive to a Close() that
+// happens to race a call already parked here.
+//
+// Reviewer feedback (XTLS/Xray-core#6580, P2): the original version
+// discarded every error from the underlying kevent syscall. dispatchLoop
+// (stack_gvisor_endpoint.go) calls ReadPacket() then Wait() in an
+// unconditional tight loop -- if kevent started failing at runtime for a
+// persistent reason (not just a benign EINTR), Wait() returning
+// immediately every time reintroduces exactly the busy-spin this whole
+// change exists to remove, just routed through a failing syscall instead
+// of procyield. waitKq.wait's own bool return distinguishes "genuinely
+// interrupted, try again" from "this kqueue is unusable now" -- Wait()
+// permanently falls back to the sleep path once that happens, rather than
+// retrying the same broken kqueue forever.
 func (t *DarwinTun) Wait() {
-	procyield(1)
+	if t.waitKq != nil && t.waitKq.wait(time.Second) {
+		return
+	}
+	if t.waitKq != nil {
+		// Persistent kevent failure (not a benign EINTR, and not just
+		// "the 1s timeout elapsed with nothing to read" -- wait() already
+		// returned true for both of those cases above). Stop trusting
+		// this kqueue for the rest of this DarwinTun's lifetime instead of
+		// re-attempting a syscall that's already shown it won't succeed.
+		t.waitKq.close()
+		t.waitKq = nil
+	}
+	// Reviewer feedback (XTLS/Xray-core#6580): procyield here is the same
+	// busy-spin this whole change exists to remove, just gated behind an
+	// edge case (kqueue setup failing, which practically never happens on
+	// real Darwin systems, or having just failed permanently above)
+	// instead of always -- a genuine bounded sleep actually yields the CPU
+	// instead of being a near-instant scheduler hint that lets the tight
+	// dispatchLoop caller spin just as hot as before.
+	time.Sleep(time.Millisecond)
 }
 
 func (t *DarwinTun) newEndpoint() (stack.LinkEndpoint, error) {

proxy/tun/tun_darwin_test.go

@@ -3,7 +3,11 @@
 package tun
 
 import (
+	"sync"
 	"testing"
+	"time"
+
+	"golang.org/x/sys/unix"
 )
 
 func TestSelectDarwinGatewayDefault(t *testing.T) {
@@ -47,3 +51,183 @@ func TestSelectDarwinGatewayRequiresUsableLocalAddress(t *testing.T) {
 		t.Fatal("expected error")
 	}
 }
+
+// newTestSocketpair returns a connected AF_UNIX/SOCK_DGRAM pair -- a real
+// fd DarwinTun.Wait's kqueue can register EVFILT_READ against, without
+// needing an actual utun interface (which requires root/network
+// entitlements this test environment doesn't have). Datagram sockets
+// (unlike pipes) support both "write makes readable" and "close makes
+// readable" the same way a tun fd's read-readiness behaves.
+func newTestSocketpair(t *testing.T) (a, b int) {
+	t.Helper()
+	fds, err := unix.Socketpair(unix.AF_UNIX, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		t.Fatalf("socketpair: %v", err)
+	}
+	t.Cleanup(func() {
+		_ = unix.Close(fds[0])
+		_ = unix.Close(fds[1])
+	})
+	return fds[0], fds[1]
+}
+
+// Reviewer feedback, XTLS/Xray-core#6580: "blocking with no data" case --
+// wait() must not return before the timeout when nothing is written.
+func TestWaitKqueueBlocksWithNoData(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+	defer kq.close()
+
+	start := time.Now()
+	ok := kq.wait(150 * time.Millisecond)
+	elapsed := time.Since(start)
+
+	if !ok {
+		t.Fatal("wait() returned false on a healthy kqueue with a plain timeout")
+	}
+	if elapsed < 100*time.Millisecond {
+		t.Fatalf("wait() returned after only %v, expected it to block close to the 150ms timeout", elapsed)
+	}
+}
+
+// Reviewer feedback: "wake up with a readable fd" case.
+func TestWaitKqueueWakesOnReadable(t *testing.T) {
+	a, b := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+	defer kq.close()
+
+	done := make(chan bool, 1)
+	go func() {
+		done <- kq.wait(5 * time.Second)
+	}()
+
+	time.Sleep(20 * time.Millisecond) // let wait() actually enter the syscall first
+	if _, err := unix.Write(b, []byte{0x1}); err != nil {
+		t.Fatalf("write: %v", err)
+	}
+
+	select {
+	case ok := <-done:
+		if !ok {
+			t.Fatal("wait() returned false after the fd became readable")
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("wait() did not wake up within 2s of the fd becoming readable")
+	}
+}
+
+// Reviewer feedback: "timeout" case, explicitly (distinct from the
+// no-data test above, which also checks blocking duration -- this one
+// only checks the return value).
+func TestWaitKqueueTimesOut(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+	defer kq.close()
+
+	if !kq.wait(50 * time.Millisecond) {
+		t.Fatal("wait() returned false on a plain timeout with no error condition")
+	}
+}
+
+// Reviewer feedback: "Close() wakes a blocked wait" case, and the
+// no-double-close/no-fd-reuse concern (P1) -- close() while wait() is
+// parked in its syscall must not panic, must not leave wait() hung, and a
+// second close() call (from a caller that, say, calls Close() twice on
+// the same DarwinTun) must be safe.
+func TestWaitKqueueCloseDuringWaitIsSafe(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+
+	started := make(chan struct{})
+	done := make(chan bool, 1)
+	go func() {
+		close(started)
+		done <- kq.wait(5 * time.Second)
+	}()
+
+	<-started
+	time.Sleep(20 * time.Millisecond) // let wait() actually enter the syscall first
+	kq.close()
+	kq.close() // double-close must be idempotent, not panic or double-free the fd
+
+	select {
+	case <-done:
+		// Either true (the close-of-the-underlying-fd unblocked kevent, a
+		// real kqueue behavior) or false (wait() observed the closed flag
+		// first) is acceptable -- what matters is that it returned at all,
+		// promptly, without hanging or crashing.
+	case <-time.After(2 * time.Second):
+		t.Fatal("wait() did not return within 2s of close() being called")
+	}
+
+	// A wait() call *after* close() must return false immediately (the
+	// closed-flag fast path), not attempt a syscall against the
+	// already-closed (and potentially since-reused, on a real system) fd
+	// number.
+	if kq.wait(time.Second) {
+		t.Fatal("wait() returned true after close() -- should short-circuit via the closed flag")
+	}
+}
+
+// Reviewer feedback: "multiple/concurrent close guard" case -- many
+// goroutines calling close() concurrently must close the underlying fd
+// exactly once.
+func TestWaitKqueueConcurrentCloseIsSafe(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+
+	var wg sync.WaitGroup
+	for range 20 {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			kq.close()
+		}()
+	}
+	wg.Wait()
+
+	if !kq.closed.Load() {
+		t.Fatal("closed flag not set after concurrent close() calls")
+	}
+}
+
+// Reviewer feedback: "kevent runtime failure without spinning" case (P2).
+// Simulates a kqueue that has gone bad (closed out from under it, as if a
+// concurrent/erroneous close happened) and confirms wait() reports it as
+// unusable (false) rather than silently returning true forever, which is
+// what DarwinTun.Wait relies on to permanently fall back to the sleep
+// path instead of re-entering a failing syscall on every dispatchLoop
+// iteration.
+func TestWaitKqueueReportsPersistentFailure(t *testing.T) {
+	a, _ := newTestSocketpair(t)
+	kq := newWaitKqueue(a)
+	if kq == nil {
+		t.Fatal("newWaitKqueue returned nil")
+	}
+	// Close the underlying kqueue fd directly (bypassing kq.close(), which
+	// would also set the closed flag) to simulate the fd going bad for a
+	// reason other than this type's own close() -- e.g. some other code
+	// path in the process closing it, or the kernel invalidating it.
+	_ = unix.Close(kq.fd)
+
+	for i := 0; i < 5; i++ {
+		if kq.wait(50 * time.Millisecond) {
+			t.Fatalf("wait() call %d returned true against a closed underlying fd -- should report failure, not spin", i)
+		}
+	}
+}

proxy/tun/tun_freebsd.go

@@ -3,28 +3,60 @@
 package tun
 
 import (
+	"context"
 	"errors"
 	"net"
-	_ "unsafe"
+	"net/netip"
+	"os"
+	"slices"
+	"sync"
+	"unsafe"
 
 	"golang.zx2c4.com/wireguard/tun"
 	"gvisor.dev/gvisor/pkg/buffer"
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 
+	"golang.org/x/net/route"
 	"golang.org/x/sys/unix"
 
 	"github.com/xtls/xray-core/common/buf"
+	xerrors "github.com/xtls/xray-core/common/errors"
 )
 
-const tunHeaderSize = 4
+const (
+	tunHeaderSize         = 4
+	defaultFreeBSDGateway = "169.254.10.1/30"
+
+	// escapeFib is the routing table outbound sockets are switched to so
+	// their traffic bypasses the TUN routes installed in the default FIB
+	// (FreeBSD's substitute for the per-socket interface binding other
+	// platforms use). Requires the boot tunable net.fibs >= 2.
+	escapeFib = 1
+)
 
 //go:linkname procyield runtime.procyield
 func procyield(cycles uint32)
 
 type FreeBSDTun struct {
-	device tun.Device
-	mtu    uint32
+	device        tun.Device
+	options       *Config
+	tunIndex      int
+	autoInterface bool
+
+	systemRoutes     []netip.Prefix
+	escapeMu         sync.Mutex
+	escapeRoutes     []escapeRoute
+	routeMonitor     *os.File
+	routeMonitorOnce sync.Once
+}
+
+// escapeRoute remembers one route written into the escape FIB, in the exact
+// shape needed to delete it again. A zero gateway means an interface route.
+type escapeRoute struct {
+	prefix  netip.Prefix
+	ifIndex int
+	gateway netip.Addr
 }
 
 var (
@@ -34,20 +66,172 @@ var (
 
 // NewTun builds new tun interface handler
 func NewTun(options *Config) (Tun, error) {
+	gateway, local, err := selectFreeBSDGateway(options.Gateway)
+	if err != nil {
+		return nil, err
+	}
+
+	// net.fibs is a boot-time constant, so validate the escape routing table
+	// before the shared handler registers a dialer controller that would
+	// otherwise steer every outbound socket into a table that was never set up.
+	if options.AutoOutboundsInterface != "" {
+		if err := checkEscapeFib(); err != nil {
+			return nil, err
+		}
+	}
+
 	tunDev, err := tun.CreateTUN(options.Name, int(options.MTU))
 	if err != nil {
 		return nil, err
 	}
 
-	return &FreeBSDTun{device: tunDev, mtu: options.MTU}, nil
+	name, err := tunDev.Name()
+	if err != nil {
+		_ = tunDev.Close()
+		return nil, err
+	}
+	// From here the interface exists in the kernel; the wireguard library does
+	// not remove it on Close, so every failure path must destroy it too or the
+	// next start fails with "interface already exists".
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		_ = tunDev.Close()
+		destroyInterface(name)
+		return nil, err
+	}
+	if err := setIPAddress(name, gateway, local, iface.Index); err != nil {
+		_ = tunDev.Close()
+		destroyInterface(name)
+		return nil, err
+	}
+
+	return &FreeBSDTun{
+		device:        tunDev,
+		options:       options,
+		tunIndex:      iface.Index,
+		autoInterface: options.AutoOutboundsInterface != "",
+	}, nil
+}
+
+// selectFreeBSDGateway picks the first IPv4 prefix from the configured gateway
+// list and the local address derived from it (the darwin semantics: the
+// gateway is the remote side of the point-to-point pair, the local address is
+// the next one after it), falling back to the same link-local default.
+func selectFreeBSDGateway(configured []string) (netip.Prefix, netip.Addr, error) {
+	gateway := netip.MustParsePrefix(defaultFreeBSDGateway)
+	if len(configured) > 0 {
+		found := false
+		for _, value := range configured {
+			prefix, err := netip.ParsePrefix(value)
+			if err != nil {
+				return netip.Prefix{}, netip.Addr{}, xerrors.New("invalid FreeBSD gateway ", value).Base(err)
+			}
+			if prefix.Addr().Is4() {
+				gateway, found = prefix, true
+				break
+			}
+		}
+		if !found {
+			return netip.Prefix{}, netip.Addr{}, xerrors.New("FreeBSD gateway requires at least one IPv4 prefix")
+		}
+	}
+
+	local, ok := nextLocalIPv4(gateway)
+	if !ok || !gateway.Contains(local) {
+		return netip.Prefix{}, netip.Addr{}, xerrors.New("FreeBSD gateway ", gateway.String(), " must contain at least one usable local IPv4 address after the gateway address")
+	}
+	return gateway, local, nil
+}
+
+func nextLocalIPv4(gateway netip.Prefix) (netip.Addr, bool) {
+	local4 := gateway.Addr().As4()
+	for i := len(local4) - 1; i >= 0; i-- {
+		local4[i]++
+		if local4[i] != 0 {
+			return netip.AddrFrom4(local4), true
+		}
+	}
+	return netip.Addr{}, false
 }
 
 func (t *FreeBSDTun) Start() error {
+	if err := t.setSystemRoutes(); err != nil {
+		return err
+	}
+
+	// Gate on this instance's own option, not the package-global updater,
+	// which a previously-removed inbound may have left set. checkEscapeFib
+	// already ran in NewTun, before the dialer controller was registered.
+	if t.autoInterface {
+		if err := t.syncEscapeFib(); err != nil {
+			_ = t.unsetSystemRoutes()
+			return err
+		}
+		fd, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+		if err != nil {
+			t.unsetEscapeFib()
+			_ = t.unsetSystemRoutes()
+			return err
+		}
+		t.routeMonitor = os.NewFile(uintptr(fd), "xray-route-monitor")
+		go t.monitorRouteChanges()
+	}
 	return nil
 }
 
+// monitorRouteChanges refreshes the outbound interface and the escape FIB
+// mirror whenever the system routing table changes.
+func (t *FreeBSDTun) monitorRouteChanges() {
+	buffer := make([]byte, 64*1024)
+	for {
+		if _, err := t.routeMonitor.Read(buffer); err != nil {
+			if !errors.Is(err, os.ErrClosed) {
+				xerrors.LogInfoInner(context.Background(), err, "[tun] failed to monitor route changes")
+			}
+			return
+		}
+		if updater != nil {
+			updater.Update()
+		}
+		if err := t.syncEscapeFib(); err != nil {
+			xerrors.LogInfoInner(context.Background(), err, "[tun] failed to refresh escape routes")
+		}
+	}
+}
+
 func (t *FreeBSDTun) Close() error {
-	return t.device.Close()
+	t.routeMonitorOnce.Do(func() {
+		if t.routeMonitor != nil {
+			_ = t.routeMonitor.Close()
+		}
+	})
+	t.unsetEscapeFib()
+	routeErr := t.unsetSystemRoutes()
+	name, nameErr := t.Name()
+	closeErr := t.device.Close()
+	// The wireguard tun device does not tear the interface down on FreeBSD,
+	// so an unclean shutdown would leave utun<n> behind and the next start
+	// would fail with "interface already exists"; destroy it explicitly.
+	if nameErr == nil {
+		destroyInterface(name)
+	}
+	return xerrors.Combine(routeErr, closeErr)
+}
+
+func destroyInterface(name string) {
+	fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		return
+	}
+	defer unix.Close(fd)
+	// struct ifreq: 16-byte name + a 16-byte union (SIOCIFDESTROY's encoded
+	// length is 32 bytes on amd64, and the kernel copies in all of it).
+	var req struct {
+		Name [unix.IFNAMSIZ]byte
+		_    [16]byte
+	}
+	copy(req.Name[:], name)
+	_ = ioctlPtr(fd, unix.SIOCIFDESTROY, unsafe.Pointer(&req))
 }
 
 func (t *FreeBSDTun) Name() (string, error) {
@@ -55,21 +239,13 @@ func (t *FreeBSDTun) Name() (string, error) {
 }
 
 func (t *FreeBSDTun) Index() (int, error) {
-	name, err := t.Name()
-	if err != nil {
-		return 0, err
-	}
-	iface, err := net.InterfaceByName(name)
-	if err != nil {
-		return 0, err
-	}
-	return iface.Index, nil
+	return t.tunIndex, nil
 }
 
 // WritePacket implements GVisorDevice method to write one packet to the tun device
 func (t *FreeBSDTun) WritePacket(packet *stack.PacketBuffer) tcpip.Error {
 	// request memory to write from reusable buffer pool
-	b := buf.NewWithSize(int32(t.mtu) + tunHeaderSize)
+	b := buf.NewWithSize(int32(t.options.MTU) + tunHeaderSize)
 	defer b.Release()
 
 	// prepare Unix specific packet header
@@ -104,7 +280,7 @@ func (t *FreeBSDTun) WritePacket(packet *stack.PacketBuffer) tcpip.Error {
 // which will make the stack call Wait which should implement desired push-back
 func (t *FreeBSDTun) ReadPacket() (byte, *stack.PacketBuffer, error) {
 	// request memory to write from reusable buffer pool
-	b := buf.NewWithSize(int32(t.mtu) + tunHeaderSize)
+	b := buf.NewWithSize(int32(t.options.MTU) + tunHeaderSize)
 
 	// read the bytes to the interface file
 	n, err := b.ReadFrom(t.device.File())
@@ -141,23 +317,551 @@ func (t *FreeBSDTun) Wait() {
 }
 
 func (t *FreeBSDTun) newEndpoint() (stack.LinkEndpoint, error) {
-	return &LinkEndpoint{deviceMTU: t.mtu, device: t}, nil
+	return &LinkEndpoint{deviceMTU: t.options.MTU, device: t}, nil
 }
 
-func setinterface(network, address string, fd uintptr, iface *net.Interface) error {
+const (
+	IN6_IFF_NODAD         = 0x0020     // netinet6/in6_var.h
+	ND6_INFINITE_LIFETIME = 0xFFFFFFFF // netinet6/nd6.h
+)
+
+// ifAliasReq4 is struct in_aliasreq from netinet/in_var.h in the 64-byte
+// layout unix.SIOCAIFADDR encodes (name + addr/dstaddr/mask sockaddrs).
+type ifAliasReq4 struct {
+	Name    [unix.IFNAMSIZ]byte
+	Addr    unix.RawSockaddrInet4
+	Dstaddr unix.RawSockaddrInet4
+	Mask    unix.RawSockaddrInet4
+}
+
+// ifAliasReq6 is struct in6_aliasreq from netinet6/in6_var.h. The trailing
+// Vhid field matters: unix.SIOCAIFADDR_IN6 is not in x/sys/unix, so
+// siocaifaddrIn6 is derived from this struct's size, and the kernel only
+// accepts the ioctl whose encoded length matches the real struct.
+type ifAliasReq6 struct {
+	Name       [unix.IFNAMSIZ]byte
+	Addr       unix.RawSockaddrInet6
+	Dstaddr    unix.RawSockaddrInet6
+	Prefixmask unix.RawSockaddrInet6
+	Flags      int32
+	Lifetime   addrLifetime6
+	Vhid       int32
+}
+
+// addrLifetime6 is struct in6_addrlifetime (time_t is int64 on freebsd/amd64).
+type addrLifetime6 struct {
+	Expire    int64
+	Preferred int64
+	Vltime    uint32
+	Pltime    uint32
+}
+
+// SIOCAIFADDR_IN6 = _IOW('i', 27, struct in6_aliasreq); x/sys/unix does not
+// carry the netinet6 ioctls, so encode it from the struct size like the
+// header macro does.
+const siocaifaddrIn6 = 0x80000000 | (uintptr(unsafe.Sizeof(ifAliasReq6{})) << 16) | ('i' << 8) | 27
+
+// setIPAddress assigns the local/remote point-to-point IPv4 pair and a
+// link-local IPv6 address to the interface, required for the routing to work
+// (same scheme as the darwin implementation: local address is the one right
+// after the gateway address).
+func setIPAddress(name string, gateway netip.Prefix, local netip.Addr, ifIndex int) error {
+	socket4, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(socket4)
+
+	local4 := local.As4()
+
+	ifReq4 := ifAliasReq4{
+		Addr: unix.RawSockaddrInet4{
+			Len:    unix.SizeofSockaddrInet4,
+			Family: unix.AF_INET,
+			Addr:   local4,
+		},
+		Dstaddr: unix.RawSockaddrInet4{
+			Len:    unix.SizeofSockaddrInet4,
+			Family: unix.AF_INET,
+			Addr:   gateway.Addr().As4(),
+		},
+		Mask: unix.RawSockaddrInet4{
+			Len:    unix.SizeofSockaddrInet4,
+			Family: unix.AF_INET,
+			Addr:   prefixMask4(gateway.Bits()),
+		},
+	}
+	copy(ifReq4.Name[:], name)
+	if err = ioctlPtr(socket4, unix.SIOCAIFADDR, unsafe.Pointer(&ifReq4)); err != nil {
+		return os.NewSyscallError("SIOCAIFADDR", err)
+	}
+
+	socket6, err := unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, 0)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(socket6)
+
+	// link-local ipv6 address with suffix from ipv4, enough for v6 interface
+	// routes to be attachable (darwin parity); a link-local address needs its
+	// scope, which for FreeBSD ioctls is the interface index
+	local6 := netip.AddrFrom16([16]byte{0: 0xfe, 1: 0x80, 12: local4[0], 13: local4[1], 14: local4[2], 15: local4[3]})
+
+	ifReq6 := ifAliasReq6{
+		Addr: unix.RawSockaddrInet6{
+			Len:      unix.SizeofSockaddrInet6,
+			Family:   unix.AF_INET6,
+			Addr:     local6.As16(),
+			Scope_id: uint32(ifIndex),
+		},
+		Prefixmask: unix.RawSockaddrInet6{
+			Len:    unix.SizeofSockaddrInet6,
+			Family: unix.AF_INET6,
+			Addr:   prefixMask6(64),
+		},
+		Flags: IN6_IFF_NODAD,
+		Lifetime: addrLifetime6{
+			Vltime: ND6_INFINITE_LIFETIME,
+			Pltime: ND6_INFINITE_LIFETIME,
+		},
+	}
+	copy(ifReq6.Name[:], name)
+	if err = ioctlPtr(socket6, uint(siocaifaddrIn6), unsafe.Pointer(&ifReq6)); err != nil {
+		// non-fatal: FreeBSD auto-configures a link-local address on UP
+		// interfaces, which is all the v6 interface routes need
+		xerrors.LogInfoInner(context.Background(), os.NewSyscallError("SIOCAIFADDR_IN6", err), "[tun] failed to assign the IPv6 link-local address")
+	}
+
 	return nil
 }
 
-func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
-	if fixedName == "" {
-		return nil, errors.New("automatic outbound interface selection is not supported on this platform")
+func ioctlPtr(fd int, req uint, arg unsafe.Pointer) error {
+	_, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(req), uintptr(arg))
+	if errno != 0 {
+		return errno
 	}
-	iface, err := net.InterfaceByName(fixedName)
+	return nil
+}
+
+func prefixMask4(bits int) [4]byte {
+	var mask [4]byte
+	copy(mask[:], net.CIDRMask(bits, 32))
+	return mask
+}
+
+func prefixMask6(bits int) [16]byte {
+	var mask [16]byte
+	copy(mask[:], net.CIDRMask(bits, 128))
+	return mask
+}
+
+// setinterface is the per-socket half of autoOutboundsInterface. FreeBSD has
+// no SO_BINDTODEVICE/IP_BOUND_IF equivalent, so the socket is pointed at the
+// escape FIB instead, where Start() mirrors the physical default route; the
+// iface argument is resolved by the shared updater but unused here (the escape
+// is table-based, not a per-socket interface bind). checkEscapeFib in NewTun
+// guarantees the FIB exists before this can run.
+func setinterface(network, address string, fd uintptr, iface *net.Interface) error {
+	return unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_SETFIB, escapeFib)
+}
+
+func (t *FreeBSDTun) setSystemRoutes() error {
+	routes, err := buildSystemRoutes(t.options.AutoSystemRoutingTable)
+	if err != nil {
+		return err
+	}
+	// Route through the interface, not a gateway: the tun(4) device is a
+	// broadcast interface here, so its point-to-point peer address doubles as
+	// the subnet broadcast and the kernel refuses to route to it (EACCES).
+	// Interface routes sidestep the gateway entirely (what wg-quick does on
+	// FreeBSD).
+	for _, destination := range routes {
+		if err := execRoute(-1, unix.RTM_ADD, t.tunIndex, destination, netip.Addr{}); err != nil {
+			_ = t.unsetSystemRoutes()
+			return xerrors.New("failed to add system route ", destination).Base(err)
+		}
+		t.systemRoutes = append(t.systemRoutes, destination)
+	}
+	return nil
+}
+
+func (t *FreeBSDTun) unsetSystemRoutes() error {
+	var errs []error
+	for i := len(t.systemRoutes) - 1; i >= 0; i-- {
+		destination := t.systemRoutes[i]
+		if err := execRoute(-1, unix.RTM_DELETE, t.tunIndex, destination, netip.Addr{}); err != nil && !errors.Is(err, unix.ESRCH) {
+			errs = append(errs, xerrors.New("failed to delete system route ", destination).Base(err))
+		}
+	}
+	t.systemRoutes = nil
+	return xerrors.Combine(errs...)
+}
+
+func buildSystemRoutes(configured []string) ([]netip.Prefix, error) {
+	routes := make([]netip.Prefix, 0, len(configured))
+	seen := make(map[netip.Prefix]struct{})
+
+	appendRoute := func(prefix netip.Prefix) {
+		prefix = prefix.Masked()
+		if _, found := seen[prefix]; found {
+			return
+		}
+		seen[prefix] = struct{}{}
+		routes = append(routes, prefix)
+	}
+
+	for _, value := range configured {
+		prefix, err := netip.ParsePrefix(value)
+		if err != nil {
+			return nil, xerrors.New("invalid system route ", value).Base(err)
+		}
+		if prefix.Bits() == 0 {
+			for _, protected := range protectedDefaultRoutes(prefix.Addr().Is4()) {
+				appendRoute(protected)
+			}
+			continue
+		}
+		appendRoute(prefix)
+	}
+
+	return routes, nil
+}
+
+// protectedDefaultRoutes splits a full default route into eight more-specific
+// prefixes covering everything but the zero /8, so the system's real default
+// route stays in place for outbound interface discovery (darwin parity).
+func protectedDefaultRoutes(ipv4 bool) []netip.Prefix {
+	routes := make([]netip.Prefix, 0, 8)
+	for i := 0; i < 8; i++ {
+		if ipv4 {
+			var address [4]byte
+			address[0] = 1 << i
+			routes = append(routes, netip.PrefixFrom(netip.AddrFrom4(address), 8-i))
+		} else {
+			var address [16]byte
+			address[0] = 1 << i
+			routes = append(routes, netip.PrefixFrom(netip.AddrFrom16(address), 8-i))
+		}
+	}
+	return routes
+}
+
+// execRoute writes one RTM message to a routing socket. fib >= 0 targets that
+// routing table via SO_SETFIB on the routing socket (what route(8) -fib
+// does); fib -1 leaves the process default table. An invalid gateway produces
+// an interface route pinned to interfaceIndex instead of a gateway route.
+func execRoute(fib int, messageType int, interfaceIndex int, destination netip.Prefix, gateway netip.Addr) error {
+	message := route.RouteMessage{
+		Type:    messageType,
+		Version: unix.RTM_VERSION,
+		Flags:   unix.RTF_STATIC | unix.RTF_GATEWAY,
+		Seq:     1,
+	}
+	if messageType == unix.RTM_ADD {
+		message.Flags |= unix.RTF_UP
+	}
+
+	var gatewayAddr route.Addr
+	switch {
+	case !gateway.IsValid():
+		message.Flags &^= unix.RTF_GATEWAY
+		message.Index = interfaceIndex
+		gatewayAddr = &route.LinkAddr{Index: interfaceIndex}
+	case gateway.Is4():
+		gatewayAddr = &route.Inet4Addr{IP: gateway.As4()}
+	default:
+		gatewayAddr = &route.Inet6Addr{IP: gateway.As16()}
+	}
+
+	if destination.Addr().Is4() {
+		message.Addrs = []route.Addr{
+			unix.RTAX_DST:     &route.Inet4Addr{IP: destination.Addr().As4()},
+			unix.RTAX_NETMASK: &route.Inet4Addr{IP: prefixMask4(destination.Bits())},
+			unix.RTAX_GATEWAY: gatewayAddr,
+		}
+	} else {
+		message.Addrs = []route.Addr{
+			unix.RTAX_DST:     &route.Inet6Addr{IP: destination.Addr().As16()},
+			unix.RTAX_NETMASK: &route.Inet6Addr{IP: prefixMask6(destination.Bits())},
+			unix.RTAX_GATEWAY: gatewayAddr,
+		}
+	}
+
+	request, err := message.Marshal()
+	if err != nil {
+		return err
+	}
+	fd, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(fd)
+	if fib >= 0 {
+		if err := unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_SETFIB, fib); err != nil {
+			return err
+		}
+	}
+	_, err = unix.Write(fd, request)
+	return err
+}
+
+func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
+	if fixedName != "" {
+		iface, err := net.InterfaceByName(fixedName)
+		if err != nil {
+			return nil, err
+		}
+		if iface.Index == tunIndex {
+			return nil, errors.New("outbound interface cannot be the TUN interface")
+		}
+		return iface, nil
+	}
+
+	physical, err := physicalDefaultRoutes(tunIndex, 0)
 	if err != nil {
 		return nil, err
 	}
-	if iface.Index == tunIndex {
-		return nil, errors.New("outbound interface cannot be the TUN interface")
+	for _, family := range []int{unix.AF_INET, unix.AF_INET6} {
+		for _, route := range physical {
+			if route.family == family {
+				return route.iface, nil
+			}
+		}
+	}
+	return nil, errors.New("default route not found")
+}
+
+// physicalRoute describes one physical default route: the interface it
+// leaves through, its gateway, and the connected prefix that makes the
+// gateway resolvable.
+type physicalRoute struct {
+	family    int
+	iface     *net.Interface
+	gateway   netip.Addr
+	connected netip.Prefix
+}
+
+// physicalDefaultRoutes scans the default routing table for default routes
+// that do not go through the TUN interface, at most one per address family
+// (the first usable one wins, matching the darwin implementation's
+// preference order). A non-zero onlyIndex restricts the scan to that
+// interface, for the fixed-name mode of autoOutboundsInterface.
+func physicalDefaultRoutes(tunIndex int, onlyIndex int) ([]physicalRoute, error) {
+	rib, err := route.FetchRIB(unix.AF_UNSPEC, route.RIBTypeRoute, 0)
+	if err != nil {
+		return nil, err
+	}
+	messages, err := route.ParseRIB(route.RIBTypeRoute, rib)
+	if err != nil {
+		return nil, err
+	}
+
+	found := make([]physicalRoute, 0, 2)
+	seen := make(map[int]bool)
+	for _, message := range messages {
+		routeMessage, ok := message.(*route.RouteMessage)
+		if !ok || routeMessage.Index == tunIndex {
+			continue
+		}
+		if onlyIndex != 0 && routeMessage.Index != onlyIndex {
+			continue
+		}
+		if routeMessage.Flags&unix.RTF_UP == 0 || routeMessage.Flags&unix.RTF_GATEWAY == 0 {
+			continue
+		}
+
+		family, ok := defaultRouteFamily(routeMessage)
+		if !ok || seen[family] {
+			continue
+		}
+		iface, err := usableInterface(routeMessage.Index)
+		if err != nil {
+			continue
+		}
+		gatewayAddr, ok := routeAddrToNetip(routeMessage.Addrs[unix.RTAX_GATEWAY])
+		if !ok {
+			continue
+		}
+		connected, err := connectedPrefix(iface, gatewayAddr)
+		if err != nil {
+			continue
+		}
+		seen[family] = true
+		found = append(found, physicalRoute{
+			family:    family,
+			iface:     iface,
+			gateway:   gatewayAddr,
+			connected: connected,
+		})
+	}
+
+	if len(found) == 0 {
+		return nil, errors.New("default route not found")
+	}
+	return found, nil
+}
+
+// defaultRouteFamily reports the address family of a RIB message that
+// represents a true default route (unspecified destination, zero mask).
+func defaultRouteFamily(message *route.RouteMessage) (int, bool) {
+	if len(message.Addrs) <= unix.RTAX_NETMASK {
+		return 0, false
+	}
+
+	switch destination := message.Addrs[unix.RTAX_DST].(type) {
+	case *route.Inet4Addr:
+		mask, ok := message.Addrs[unix.RTAX_NETMASK].(*route.Inet4Addr)
+		if !ok || destination.IP != netip.IPv4Unspecified().As4() {
+			return 0, false
+		}
+		ones, bits := net.IPMask(mask.IP[:]).Size()
+		return unix.AF_INET, ones == 0 && bits == 32
+	case *route.Inet6Addr:
+		mask, ok := message.Addrs[unix.RTAX_NETMASK].(*route.Inet6Addr)
+		if !ok || destination.IP != netip.IPv6Unspecified().As16() {
+			return 0, false
+		}
+		ones, bits := net.IPMask(mask.IP[:]).Size()
+		return unix.AF_INET6, ones == 0 && bits == 128
+	default:
+		return 0, false
+	}
+}
+
+func usableInterface(index int) (*net.Interface, error) {
+	iface, err := net.InterfaceByIndex(index)
+	if err != nil {
+		return nil, err
+	}
+	if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+		return nil, errors.New("default route interface is not usable")
 	}
 	return iface, nil
 }
+
+func routeAddrToNetip(addr route.Addr) (netip.Addr, bool) {
+	switch typed := addr.(type) {
+	case *route.Inet4Addr:
+		return netip.AddrFrom4(typed.IP), true
+	case *route.Inet6Addr:
+		return netip.AddrFrom16(typed.IP), true
+	default:
+		return netip.Addr{}, false
+	}
+}
+
+// checkEscapeFib verifies the system can host the escape routing table at
+// all: FIBs are a boot-time resource on FreeBSD.
+func checkEscapeFib() error {
+	fibs, err := unix.SysctlUint32("net.fibs")
+	if err != nil {
+		return xerrors.New("failed to read net.fibs").Base(err)
+	}
+	if fibs < 2 {
+		return errors.New("automatic outbound interface on FreeBSD needs a second routing table: add net.fibs=2 to /boot/loader.conf and reboot")
+	}
+	current, err := unix.SysctlUint32("net.my_fibnum")
+	if err != nil {
+		return xerrors.New("failed to read net.my_fibnum").Base(err)
+	}
+	if current == escapeFib {
+		return errors.New("xray runs inside routing table 1, which is reserved as the escape table; start it in another FIB")
+	}
+	return nil
+}
+
+// syncEscapeFib mirrors the physical default routes (and the connected
+// prefixes their gateways resolve through) into the escape FIB, replacing
+// whatever mirror a previous call installed. On discovery failure the old
+// mirror is kept, since a stale escape route beats none during a transient
+// route flap.
+func (t *FreeBSDTun) syncEscapeFib() error {
+	var onlyIndex int
+	if t.options.AutoOutboundsInterface != "" && updater != nil {
+		if iface := updater.Get(); iface != nil {
+			onlyIndex = iface.Index
+		}
+	}
+	physical, err := physicalDefaultRoutes(t.tunIndex, onlyIndex)
+	if err != nil {
+		return err
+	}
+
+	desired := make([]escapeRoute, 0, 2*len(physical))
+	for _, p := range physical {
+		desired = append(desired,
+			escapeRoute{prefix: p.connected, ifIndex: p.iface.Index},
+			escapeRoute{prefix: defaultPrefix(p.family), ifIndex: p.iface.Index, gateway: p.gateway},
+		)
+	}
+
+	t.escapeMu.Lock()
+	defer t.escapeMu.Unlock()
+
+	// The route monitor hears our own escape FIB writes too; rewriting an
+	// unchanged mirror on every wake-up would ping-pong forever.
+	if slices.Equal(t.escapeRoutes, desired) {
+		return nil
+	}
+
+	t.unsetEscapeFibLocked()
+	for _, entry := range desired {
+		err := execRoute(escapeFib, unix.RTM_ADD, entry.ifIndex, entry.prefix, entry.gateway)
+		if err != nil && !errors.Is(err, unix.EEXIST) {
+			return xerrors.New("failed to add escape route ", entry.prefix).Base(err)
+		}
+		t.escapeRoutes = append(t.escapeRoutes, entry)
+	}
+	return nil
+}
+
+func (t *FreeBSDTun) unsetEscapeFib() {
+	t.escapeMu.Lock()
+	defer t.escapeMu.Unlock()
+	t.unsetEscapeFibLocked()
+}
+
+func (t *FreeBSDTun) unsetEscapeFibLocked() {
+	for i := len(t.escapeRoutes) - 1; i >= 0; i-- {
+		entry := t.escapeRoutes[i]
+		err := execRoute(escapeFib, unix.RTM_DELETE, entry.ifIndex, entry.prefix, entry.gateway)
+		if err != nil && !errors.Is(err, unix.ESRCH) {
+			xerrors.LogInfoInner(context.Background(), err, "[tun] failed to delete escape route ", entry.prefix)
+		}
+	}
+	t.escapeRoutes = nil
+}
+
+func defaultPrefix(family int) netip.Prefix {
+	if family == unix.AF_INET {
+		return netip.PrefixFrom(netip.IPv4Unspecified(), 0)
+	}
+	return netip.PrefixFrom(netip.IPv6Unspecified(), 0)
+}
+
+// connectedPrefix finds the interface's address prefix containing the
+// gateway, which the escape FIB needs as an interface route so the mirrored
+// default route's gateway is resolvable there.
+func connectedPrefix(iface *net.Interface, gateway netip.Addr) (netip.Prefix, error) {
+	addrs, err := iface.Addrs()
+	if err != nil {
+		return netip.Prefix{}, err
+	}
+	for _, addr := range addrs {
+		ipNet, ok := addr.(*net.IPNet)
+		if !ok {
+			continue
+		}
+		ip, ok := netip.AddrFromSlice(ipNet.IP)
+		if !ok {
+			continue
+		}
+		ip = ip.Unmap()
+		ones, _ := ipNet.Mask.Size()
+		prefix := netip.PrefixFrom(ip, ones).Masked()
+		if prefix.Contains(gateway.WithZone("").Unmap()) {
+			return prefix, nil
+		}
+	}
+	return netip.Prefix{}, errors.New("no connected prefix contains the gateway")
+}

proxy/tun/tun_freebsd_test.go

@@ -0,0 +1,150 @@
+//go:build freebsd
+
+package tun
+
+import (
+	"net/netip"
+	"testing"
+
+	"golang.org/x/net/route"
+	"golang.org/x/sys/unix"
+)
+
+func TestSelectFreeBSDGatewayDefault(t *testing.T) {
+	gateway, local, err := selectFreeBSDGateway(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if gateway != netip.MustParsePrefix(defaultFreeBSDGateway) {
+		t.Fatal("expected default gateway, got ", gateway)
+	}
+	if local != netip.MustParseAddr("169.254.10.2") {
+		t.Fatal("wrong local address: ", local)
+	}
+}
+
+func TestSelectFreeBSDGatewayPicksFirstIPv4(t *testing.T) {
+	gateway, local, err := selectFreeBSDGateway([]string{"fd00::1/64", "10.0.0.1/30", "10.9.9.9/24"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if gateway != netip.MustParsePrefix("10.0.0.1/30") {
+		t.Fatal("wrong gateway: ", gateway)
+	}
+	if local != netip.MustParseAddr("10.0.0.2") {
+		t.Fatal("wrong local address: ", local)
+	}
+}
+
+func TestSelectFreeBSDGatewayRequiresIPv4(t *testing.T) {
+	if _, _, err := selectFreeBSDGateway([]string{"fd00::1/64"}); err == nil {
+		t.Fatal("expected error when no IPv4 gateway is configured")
+	}
+}
+
+func TestSelectFreeBSDGatewayRejectsGarbage(t *testing.T) {
+	if _, _, err := selectFreeBSDGateway([]string{"not-a-prefix"}); err == nil {
+		t.Fatal("expected error for invalid gateway")
+	}
+}
+
+func TestSelectFreeBSDGatewayRejectsFullPrefix(t *testing.T) {
+	// 10.0.0.255/30: the "next" local address falls outside the prefix
+	if _, _, err := selectFreeBSDGateway([]string{"10.0.0.255/30"}); err == nil {
+		t.Fatal("expected error when no usable local address follows the gateway")
+	}
+}
+
+func TestNextLocalIPv4(t *testing.T) {
+	local, ok := nextLocalIPv4(netip.MustParsePrefix("169.254.10.1/30"))
+	if !ok || local != netip.MustParseAddr("169.254.10.2") {
+		t.Fatal("wrong local address: ", local)
+	}
+}
+
+func TestBuildSystemRoutesSplitsDefault(t *testing.T) {
+	routes, err := buildSystemRoutes([]string{"0.0.0.0/0"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	expected := []string{
+		"1.0.0.0/8", "2.0.0.0/7", "4.0.0.0/6", "8.0.0.0/5",
+		"16.0.0.0/4", "32.0.0.0/3", "64.0.0.0/2", "128.0.0.0/1",
+	}
+	if len(routes) != len(expected) {
+		t.Fatal("expected ", len(expected), " routes, got ", routes)
+	}
+	for i, want := range expected {
+		if routes[i] != netip.MustParsePrefix(want) {
+			t.Fatal("route ", i, ": expected ", want, ", got ", routes[i])
+		}
+	}
+}
+
+func TestBuildSystemRoutesSplitsDefaultIPv6(t *testing.T) {
+	routes, err := buildSystemRoutes([]string{"::/0"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(routes) != 8 || routes[7] != netip.MustParsePrefix("8000::/1") {
+		t.Fatal("unexpected v6 split: ", routes)
+	}
+}
+
+func TestBuildSystemRoutesDeduplicates(t *testing.T) {
+	routes, err := buildSystemRoutes([]string{"10.0.0.0/8", "10.1.2.3/8", "0.0.0.0/0", "0.0.0.0/0"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(routes) != 9 { // 10.0.0.0/8 once + 8 splits once
+		t.Fatal("expected 9 routes, got ", routes)
+	}
+}
+
+func TestBuildSystemRoutesRejectsGarbage(t *testing.T) {
+	if _, err := buildSystemRoutes([]string{"10.0.0.0/33"}); err == nil {
+		t.Fatal("expected error for invalid route")
+	}
+}
+
+func routeMessage(dst, mask route.Addr) *route.RouteMessage {
+	addrs := make([]route.Addr, unix.RTAX_NETMASK+1)
+	addrs[unix.RTAX_DST] = dst
+	addrs[unix.RTAX_NETMASK] = mask
+	return &route.RouteMessage{Addrs: addrs}
+}
+
+func TestDefaultRouteFamilyMatchesIPv4Default(t *testing.T) {
+	family, ok := defaultRouteFamily(routeMessage(&route.Inet4Addr{}, &route.Inet4Addr{}))
+	if !ok || family != unix.AF_INET {
+		t.Fatal("expected IPv4 default route match")
+	}
+}
+
+func TestDefaultRouteFamilyMatchesIPv6Default(t *testing.T) {
+	family, ok := defaultRouteFamily(routeMessage(&route.Inet6Addr{}, &route.Inet6Addr{}))
+	if !ok || family != unix.AF_INET6 {
+		t.Fatal("expected IPv6 default route match")
+	}
+}
+
+func TestDefaultRouteFamilyRejectsNonDefault(t *testing.T) {
+	if _, ok := defaultRouteFamily(routeMessage(
+		&route.Inet4Addr{IP: [4]byte{10, 0, 0, 0}},
+		&route.Inet4Addr{IP: [4]byte{255, 0, 0, 0}},
+	)); ok {
+		t.Fatal("non-default destination must not match")
+	}
+	if _, ok := defaultRouteFamily(routeMessage(
+		&route.Inet4Addr{},
+		&route.Inet4Addr{IP: [4]byte{255, 0, 0, 0}},
+	)); ok {
+		t.Fatal("non-zero mask must not match")
+	}
+}
+
+func TestDefaultRouteFamilyRejectsShortAddrs(t *testing.T) {
+	if _, ok := defaultRouteFamily(&route.RouteMessage{}); ok {
+		t.Fatal("message without addresses must not match")
+	}
+}

proxy/wireguard/client.go

@@ -5,9 +5,10 @@ import (
 	"fmt"
 	gonet "net"
 	"net/netip"
-	reflect "reflect"
+	"reflect"
 	"strings"
 	"sync"
+	"time"
 
 	"golang.zx2c4.com/wireguard/tun"
 
@@ -30,6 +31,11 @@ import (
 	"golang.zx2c4.com/wireguard/device"
 )
 
+type entry struct {
+	got  []net.IP
+	time time.Time
+}
+
 type Handler struct {
 	conf          *DeviceConfig
 	policyManager policy.Manager
@@ -43,6 +49,11 @@ type Handler struct {
 	tnet *Net
 	dev  *device.Device
 	mu   sync.Mutex
+
+	// TODO: cache cleanup loop
+	local   bool
+	cache   map[string]entry
+	cacheMu sync.Mutex
 }
 
 func NewClient(ctx context.Context, conf *DeviceConfig) (*Handler, error) {
@@ -98,6 +109,20 @@ func NewClient(ctx context.Context, conf *DeviceConfig) (*Handler, error) {
 		return nil, err
 	}
 
+	local := false
+	dns := conf.DNS
+	if len(dns) == 0 {
+		dns = []string{"1.1.1.1", "1.0.0.1", "2606:4700:4700::1111", "2606:4700:4700::1001"}
+	}
+	if len(dns) == 1 && dns[0] == "local" {
+		local = true
+		dns = nil
+	}
+	dnses := make([]netip.Addr, 0, len(dns))
+	for _, dns := range dns {
+		dnses = append(dnses, netip.MustParseAddr(dns))
+	}
+
 	kernelTunSupported, err := KernelTunSupported()
 	if err != nil {
 		errors.LogWarningInner(context.Background(), err, "Failed to check kernel TUN support")
@@ -106,10 +131,10 @@ func NewClient(ctx context.Context, conf *DeviceConfig) (*Handler, error) {
 	var tnet *Net
 	if !conf.NoKernelTun && kernelTunSupported {
 		errors.LogWarning(context.Background(), "Using kernel TUN")
-		tun, tnet, err = createKernelTun(localAddresses, []netip.Addr{netip.MustParseAddr("1.1.1.1"), netip.MustParseAddr("1.0.0.1"), netip.MustParseAddr("2606:4700:4700::1111"), netip.MustParseAddr("2606:4700:4700::1001")}, int(conf.Mtu))
+		tun, tnet, err = createKernelTun(localAddresses, dnses, int(conf.Mtu))
 	} else {
 		errors.LogWarning(context.Background(), "Using gVisor TUN")
-		tun, tnet, _, err = CreateNetTUN(localAddresses, []netip.Addr{netip.MustParseAddr("1.1.1.1"), netip.MustParseAddr("1.0.0.1"), netip.MustParseAddr("2606:4700:4700::1111"), netip.MustParseAddr("2606:4700:4700::1001")}, int(conf.Mtu), true)
+		tun, tnet, _, err = CreateNetTUN(localAddresses, dnses, int(conf.Mtu), true)
 	}
 	if err != nil {
 		return nil, err
@@ -126,6 +151,9 @@ func NewClient(ctx context.Context, conf *DeviceConfig) (*Handler, error) {
 
 		tun:  tun,
 		tnet: tnet,
+
+		local: local,
+		cache: make(map[string]entry),
 	}, nil
 }
 
@@ -138,6 +166,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	}
 	ob.Name = "wireguard"
 	ob.CanSpliceCopy = 3
+	dialer.SetOutboundGateway(ctx, ob)
 
 	if err := h.init(ctx); err != nil {
 		return err
@@ -342,31 +371,34 @@ func (h *Handler) init(ctx context.Context) error {
 }
 
 func (h *Handler) resolveLocal(host string) (net.IP, error) {
-	return resolveDomain(host, h.conf.DomainStrategy, func(host string) ([]net.IP, error) {
-		ips, _, err := h.dns.LookupIP(host, dns.IPOption{IPv4Enable: true, IPv6Enable: true})
-		return ips, err
+	return h.resolveDomain(host, h.conf.DomainStrategy, func(host string) ([]net.IP, uint32, error) {
+		return h.dns.LookupIP(host, dns.IPOption{IPv4Enable: true, IPv6Enable: true})
 	})
 }
 
 func (h *Handler) resolveRemote(host string) (net.IP, error) {
-	return resolveDomain(host, h.conf.DomainStrategy, func(host string) ([]net.IP, error) {
-		addrs, err := h.tnet.LookupHost(host)
-		if err != nil {
-			return nil, err
+	return h.resolveDomain(host, h.conf.DomainStrategy, func(host string) ([]net.IP, uint32, error) {
+		if h.local {
+			return h.dns.LookupIP(host, dns.IPOption{IPv4Enable: true, IPv6Enable: true})
 		}
-		ips := make([]net.IP, 0, len(addrs))
-		for _, addr := range addrs {
-			ips = append(ips, net.ParseIP(addr))
-		}
-		return ips, nil
+		return h.tnet.LookupHost(host)
 	})
 }
 
-func resolveDomain(host string, strategy DeviceConfig_DomainStrategy, lookupIP func(host string) ([]net.IP, error)) (net.IP, error) {
+func (h *Handler) resolveDomain(host string, strategy DeviceConfig_DomainStrategy, lookupIP func(host string) ([]net.IP, uint32, error)) (net.IP, error) {
 	if ip := net.ParseIP(host); ip != nil {
 		return ip, nil
 	}
-	ips, err := lookupIP(host)
+	h.cacheMu.Lock()
+	if entry, ok := h.cache[host]; ok {
+		if time.Now().Before(entry.time) {
+			h.cacheMu.Unlock()
+			return entry.got[dice.Roll(len(entry.got))], nil
+		}
+		delete(h.cache, host)
+	}
+	h.cacheMu.Unlock()
+	ips, ttl, err := lookupIP(host)
 	if err != nil {
 		return nil, err
 	}
@@ -406,6 +438,13 @@ func resolveDomain(host string, strategy DeviceConfig_DomainStrategy, lookupIP f
 	if len(got) == 0 {
 		return nil, dns.ErrEmptyResponse
 	}
+	entry := entry{
+		got:  got,
+		time: time.Now().Add(time.Duration(ttl) * time.Second),
+	}
+	h.cacheMu.Lock()
+	h.cache[host] = entry
+	h.cacheMu.Unlock()
 	return got[dice.Roll(len(got))], nil
 }
 

proxy/wireguard/config.pb.go

@@ -164,6 +164,7 @@ type DeviceConfig struct {
 	DomainStrategy DeviceConfig_DomainStrategy `protobuf:"varint,7,opt,name=domain_strategy,json=domainStrategy,proto3,enum=xray.proxy.wireguard.DeviceConfig_DomainStrategy" json:"domain_strategy,omitempty"`
 	IsClient       bool                        `protobuf:"varint,8,opt,name=is_client,json=isClient,proto3" json:"is_client,omitempty"`
 	NoKernelTun    bool                        `protobuf:"varint,9,opt,name=no_kernel_tun,json=noKernelTun,proto3" json:"no_kernel_tun,omitempty"`
+	DNS            []string                    `protobuf:"bytes,10,rep,name=DNS,proto3" json:"DNS,omitempty"`
 	unknownFields  protoimpl.UnknownFields
 	sizeCache      protoimpl.SizeCache
 }
@@ -261,6 +262,13 @@ func (x *DeviceConfig) GetNoKernelTun() bool {
 	return false
 }
 
+func (x *DeviceConfig) GetDNS() []string {
+	if x != nil {
+		return x.DNS
+	}
+	return nil
+}
+
 var File_proxy_wireguard_config_proto protoreflect.FileDescriptor
 
 const file_proxy_wireguard_config_proto_rawDesc = "" +
@@ -275,7 +283,7 @@ const file_proxy_wireguard_config_proto_rawDesc = "" +
 	"\n" +
 	"keep_alive\x18\x04 \x01(\tR\tkeepAlive\x12\x1f\n" +
 	"\vallowed_ips\x18\x05 \x03(\tR\n" +
-	"allowedIps\"\xdc\x03\n" +
+	"allowedIps\"\xee\x03\n" +
 	"\fDeviceConfig\x12\x1d\n" +
 	"\n" +
 	"secret_key\x18\x01 \x01(\tR\tsecretKey\x12\x1a\n" +
@@ -286,7 +294,9 @@ const file_proxy_wireguard_config_proto_rawDesc = "" +
 	"\breserved\x18\x06 \x01(\fR\breserved\x12Z\n" +
 	"\x0fdomain_strategy\x18\a \x01(\x0e21.xray.proxy.wireguard.DeviceConfig.DomainStrategyR\x0edomainStrategy\x12\x1b\n" +
 	"\tis_client\x18\b \x01(\bR\bisClient\x12\"\n" +
-	"\rno_kernel_tun\x18\t \x01(\bR\vnoKernelTun\"\\\n" +
+	"\rno_kernel_tun\x18\t \x01(\bR\vnoKernelTun\x12\x10\n" +
+	"\x03DNS\x18\n" +
+	" \x03(\tR\x03DNS\"\\\n" +
 	"\x0eDomainStrategy\x12\f\n" +
 	"\bFORCE_IP\x10\x00\x12\r\n" +
 	"\tFORCE_IP4\x10\x01\x12\r\n" +

proxy/wireguard/config.proto

@@ -34,4 +34,5 @@ message DeviceConfig {
   DomainStrategy domain_strategy = 7;
   bool is_client = 8;
   bool no_kernel_tun = 9;
+  repeated string DNS = 10;
 }

proxy/wireguard/netstack.go

@@ -248,7 +248,7 @@ var (
 	errTimeout                      = errors.New("i/o timeout")
 )
 
-func (net *Net) LookupHost(host string) (addrs []string, err error) {
+func (net *Net) LookupHost(host string) (addrs []net.IP, ttl uint32, err error) {
 	return net.LookupContextHost(context.Background(), host)
 }
 
@@ -567,9 +567,9 @@ func (tnet *Net) tryOneName(ctx context.Context, name string, qtype dnsmessage.T
 	return dnsmessage.Parser{}, "", lastErr
 }
 
-func (tnet *Net) LookupContextHost(ctx context.Context, host string) ([]string, error) {
+func (tnet *Net) LookupContextHost(ctx context.Context, host string) ([]net.IP, uint32, error) {
 	if host == "" || (!tnet.hasV6 && !tnet.hasV4) {
-		return nil, &net.DNSError{Err: errNoSuchHost.Error(), Name: host, IsNotFound: true}
+		return nil, 0, &net.DNSError{Err: errNoSuchHost.Error(), Name: host, IsNotFound: true}
 	}
 	zlen := len(host)
 	if strings.IndexByte(host, ':') != -1 {
@@ -578,11 +578,11 @@ func (tnet *Net) LookupContextHost(ctx context.Context, host string) ([]string,
 		}
 	}
 	if ip, err := netip.ParseAddr(host[:zlen]); err == nil {
-		return []string{ip.String()}, nil
+		return []net.IP{ip.AsSlice()}, 0, nil
 	}
 
 	if !isDomainName(host) {
-		return nil, &net.DNSError{Err: errNoSuchHost.Error(), Name: host, IsNotFound: true}
+		return nil, 0, &net.DNSError{Err: errNoSuchHost.Error(), Name: host, IsNotFound: true}
 	}
 	type result struct {
 		p      dnsmessage.Parser
@@ -611,6 +611,7 @@ func (tnet *Net) LookupContextHost(ctx context.Context, host string) ([]string,
 			lane <- result{p, server, err}
 		}()
 	}
+	ttl := uint32(300)
 	for l := 0; l < lanes; l++ {
 		result := <-lane
 		if result.error != nil {
@@ -644,6 +645,7 @@ func (tnet *Net) LookupContextHost(ctx context.Context, host string) ([]string,
 					}
 					break loop
 				}
+				ttl = min(ttl, h.TTL)
 				addrsV4 = append(addrsV4, netip.AddrFrom4(a.A))
 
 			case dnsmessage.TypeAAAA:
@@ -656,6 +658,7 @@ func (tnet *Net) LookupContextHost(ctx context.Context, host string) ([]string,
 					}
 					break loop
 				}
+				ttl = min(ttl, h.TTL)
 				addrsV6 = append(addrsV6, netip.AddrFrom16(aaaa.AAAA))
 
 			default:
@@ -680,11 +683,11 @@ func (tnet *Net) LookupContextHost(ctx context.Context, host string) ([]string,
 	}
 
 	if len(addrs) == 0 && lastErr != nil {
-		return nil, lastErr
+		return nil, 0, lastErr
 	}
-	saddrs := make([]string, 0, len(addrs))
+	ips := make([]net.IP, 0, len(addrs))
 	for _, ip := range addrs {
-		saddrs = append(saddrs, ip.String())
+		ips = append(ips, ip.AsSlice())
 	}
-	return saddrs, nil
+	return ips, ttl, nil
 }

transport/internet/config.pb.go

@@ -443,22 +443,26 @@ func (x *UdpHop) GetIntervalMax() int64 {
 }
 
 type QuicParams struct {
-	state                   protoimpl.MessageState `protogen:"open.v1"`
-	Congestion              string                 `protobuf:"bytes,1,opt,name=congestion,proto3" json:"congestion,omitempty"`
-	BbrProfile              string                 `protobuf:"bytes,2,opt,name=bbr_profile,json=bbrProfile,proto3" json:"bbr_profile,omitempty"`
-	BrutalUp                uint64                 `protobuf:"varint,3,opt,name=brutal_up,json=brutalUp,proto3" json:"brutal_up,omitempty"`
-	BrutalDown              uint64                 `protobuf:"varint,4,opt,name=brutal_down,json=brutalDown,proto3" json:"brutal_down,omitempty"`
-	UdpHop                  *UdpHop                `protobuf:"bytes,5,opt,name=udp_hop,json=udpHop,proto3" json:"udp_hop,omitempty"`
-	InitStreamReceiveWindow uint64                 `protobuf:"varint,6,opt,name=init_stream_receive_window,json=initStreamReceiveWindow,proto3" json:"init_stream_receive_window,omitempty"`
-	MaxStreamReceiveWindow  uint64                 `protobuf:"varint,7,opt,name=max_stream_receive_window,json=maxStreamReceiveWindow,proto3" json:"max_stream_receive_window,omitempty"`
-	InitConnReceiveWindow   uint64                 `protobuf:"varint,8,opt,name=init_conn_receive_window,json=initConnReceiveWindow,proto3" json:"init_conn_receive_window,omitempty"`
-	MaxConnReceiveWindow    uint64                 `protobuf:"varint,9,opt,name=max_conn_receive_window,json=maxConnReceiveWindow,proto3" json:"max_conn_receive_window,omitempty"`
-	MaxIdleTimeout          int64                  `protobuf:"varint,10,opt,name=max_idle_timeout,json=maxIdleTimeout,proto3" json:"max_idle_timeout,omitempty"`
-	KeepAlivePeriod         int64                  `protobuf:"varint,11,opt,name=keep_alive_period,json=keepAlivePeriod,proto3" json:"keep_alive_period,omitempty"`
-	DisablePathMtuDiscovery bool                   `protobuf:"varint,12,opt,name=disable_path_mtu_discovery,json=disablePathMtuDiscovery,proto3" json:"disable_path_mtu_discovery,omitempty"`
-	MaxIncomingStreams      int64                  `protobuf:"varint,13,opt,name=max_incoming_streams,json=maxIncomingStreams,proto3" json:"max_incoming_streams,omitempty"`
-	unknownFields           protoimpl.UnknownFields
-	sizeCache               protoimpl.SizeCache
+	state                         protoimpl.MessageState `protogen:"open.v1"`
+	Congestion                    string                 `protobuf:"bytes,1,opt,name=congestion,proto3" json:"congestion,omitempty"`
+	BbrProfile                    string                 `protobuf:"bytes,2,opt,name=bbr_profile,json=bbrProfile,proto3" json:"bbr_profile,omitempty"`
+	BrutalUp                      uint64                 `protobuf:"varint,3,opt,name=brutal_up,json=brutalUp,proto3" json:"brutal_up,omitempty"`
+	BrutalDown                    uint64                 `protobuf:"varint,4,opt,name=brutal_down,json=brutalDown,proto3" json:"brutal_down,omitempty"`
+	BrutalDisableLossCompensation bool                   `protobuf:"varint,5,opt,name=brutal_disable_loss_compensation,json=brutalDisableLossCompensation,proto3" json:"brutal_disable_loss_compensation,omitempty"`
+	UdpHop                        *UdpHop                `protobuf:"bytes,6,opt,name=udp_hop,json=udpHop,proto3" json:"udp_hop,omitempty"`
+	InitStreamReceiveWindow       uint64                 `protobuf:"varint,7,opt,name=init_stream_receive_window,json=initStreamReceiveWindow,proto3" json:"init_stream_receive_window,omitempty"`
+	MaxStreamReceiveWindow        uint64                 `protobuf:"varint,8,opt,name=max_stream_receive_window,json=maxStreamReceiveWindow,proto3" json:"max_stream_receive_window,omitempty"`
+	InitConnReceiveWindow         uint64                 `protobuf:"varint,9,opt,name=init_conn_receive_window,json=initConnReceiveWindow,proto3" json:"init_conn_receive_window,omitempty"`
+	MaxConnReceiveWindow          uint64                 `protobuf:"varint,10,opt,name=max_conn_receive_window,json=maxConnReceiveWindow,proto3" json:"max_conn_receive_window,omitempty"`
+	MaxIdleTimeout                int64                  `protobuf:"varint,11,opt,name=max_idle_timeout,json=maxIdleTimeout,proto3" json:"max_idle_timeout,omitempty"`
+	KeepAlivePeriod               int64                  `protobuf:"varint,12,opt,name=keep_alive_period,json=keepAlivePeriod,proto3" json:"keep_alive_period,omitempty"`
+	DisablePathMtuDiscovery       bool                   `protobuf:"varint,13,opt,name=disable_path_mtu_discovery,json=disablePathMtuDiscovery,proto3" json:"disable_path_mtu_discovery,omitempty"`
+	DisableChromeParrot           bool                   `protobuf:"varint,14,opt,name=disable_chrome_parrot,json=disableChromeParrot,proto3" json:"disable_chrome_parrot,omitempty"`
+	DisableGSO                    bool                   `protobuf:"varint,15,opt,name=disableGSO,proto3" json:"disableGSO,omitempty"`
+	MaxIncomingStreams            int64                  `protobuf:"varint,16,opt,name=max_incoming_streams,json=maxIncomingStreams,proto3" json:"max_incoming_streams,omitempty"`
+	DisableStatelessReset         bool                   `protobuf:"varint,17,opt,name=disable_stateless_reset,json=disableStatelessReset,proto3" json:"disable_stateless_reset,omitempty"`
+	unknownFields                 protoimpl.UnknownFields
+	sizeCache                     protoimpl.SizeCache
 }
 
 func (x *QuicParams) Reset() {
@@ -519,6 +523,13 @@ func (x *QuicParams) GetBrutalDown() uint64 {
 	return 0
 }
 
+func (x *QuicParams) GetBrutalDisableLossCompensation() bool {
+	if x != nil {
+		return x.BrutalDisableLossCompensation
+	}
+	return false
+}
+
 func (x *QuicParams) GetUdpHop() *UdpHop {
 	if x != nil {
 		return x.UdpHop
@@ -575,6 +586,20 @@ func (x *QuicParams) GetDisablePathMtuDiscovery() bool {
 	return false
 }
 
+func (x *QuicParams) GetDisableChromeParrot() bool {
+	if x != nil {
+		return x.DisableChromeParrot
+	}
+	return false
+}
+
+func (x *QuicParams) GetDisableGSO() bool {
+	if x != nil {
+		return x.DisableGSO
+	}
+	return false
+}
+
 func (x *QuicParams) GetMaxIncomingStreams() int64 {
 	if x != nil {
 		return x.MaxIncomingStreams
@@ -582,6 +607,13 @@ func (x *QuicParams) GetMaxIncomingStreams() int64 {
 	return 0
 }
 
+func (x *QuicParams) GetDisableStatelessReset() bool {
+	if x != nil {
+		return x.DisableStatelessReset
+	}
+	return false
+}
+
 type ProxyConfig struct {
 	state               protoimpl.MessageState `protogen:"open.v1"`
 	Tag                 string                 `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
@@ -1020,7 +1052,7 @@ const file_transport_internet_config_proto_rawDesc = "" +
 	"\x06UdpHop\x12\x14\n" +
 	"\x05ports\x18\x01 \x03(\rR\x05ports\x12!\n" +
 	"\finterval_min\x18\x02 \x01(\x03R\vintervalMin\x12!\n" +
-	"\finterval_max\x18\x03 \x01(\x03R\vintervalMax\"\xf2\x04\n" +
+	"\finterval_max\x18\x03 \x01(\x03R\vintervalMax\"\xc7\x06\n" +
 	"\n" +
 	"QuicParams\x12\x1e\n" +
 	"\n" +
@@ -1030,17 +1062,23 @@ const file_transport_internet_config_proto_rawDesc = "" +
 	"bbrProfile\x12\x1b\n" +
 	"\tbrutal_up\x18\x03 \x01(\x04R\bbrutalUp\x12\x1f\n" +
 	"\vbrutal_down\x18\x04 \x01(\x04R\n" +
-	"brutalDown\x128\n" +
-	"\audp_hop\x18\x05 \x01(\v2\x1f.xray.transport.internet.UdpHopR\x06udpHop\x12;\n" +
-	"\x1ainit_stream_receive_window\x18\x06 \x01(\x04R\x17initStreamReceiveWindow\x129\n" +
-	"\x19max_stream_receive_window\x18\a \x01(\x04R\x16maxStreamReceiveWindow\x127\n" +
-	"\x18init_conn_receive_window\x18\b \x01(\x04R\x15initConnReceiveWindow\x125\n" +
-	"\x17max_conn_receive_window\x18\t \x01(\x04R\x14maxConnReceiveWindow\x12(\n" +
-	"\x10max_idle_timeout\x18\n" +
-	" \x01(\x03R\x0emaxIdleTimeout\x12*\n" +
-	"\x11keep_alive_period\x18\v \x01(\x03R\x0fkeepAlivePeriod\x12;\n" +
-	"\x1adisable_path_mtu_discovery\x18\f \x01(\bR\x17disablePathMtuDiscovery\x120\n" +
-	"\x14max_incoming_streams\x18\r \x01(\x03R\x12maxIncomingStreams\"Q\n" +
+	"brutalDown\x12G\n" +
+	" brutal_disable_loss_compensation\x18\x05 \x01(\bR\x1dbrutalDisableLossCompensation\x128\n" +
+	"\audp_hop\x18\x06 \x01(\v2\x1f.xray.transport.internet.UdpHopR\x06udpHop\x12;\n" +
+	"\x1ainit_stream_receive_window\x18\a \x01(\x04R\x17initStreamReceiveWindow\x129\n" +
+	"\x19max_stream_receive_window\x18\b \x01(\x04R\x16maxStreamReceiveWindow\x127\n" +
+	"\x18init_conn_receive_window\x18\t \x01(\x04R\x15initConnReceiveWindow\x125\n" +
+	"\x17max_conn_receive_window\x18\n" +
+	" \x01(\x04R\x14maxConnReceiveWindow\x12(\n" +
+	"\x10max_idle_timeout\x18\v \x01(\x03R\x0emaxIdleTimeout\x12*\n" +
+	"\x11keep_alive_period\x18\f \x01(\x03R\x0fkeepAlivePeriod\x12;\n" +
+	"\x1adisable_path_mtu_discovery\x18\r \x01(\bR\x17disablePathMtuDiscovery\x122\n" +
+	"\x15disable_chrome_parrot\x18\x0e \x01(\bR\x13disableChromeParrot\x12\x1e\n" +
+	"\n" +
+	"disableGSO\x18\x0f \x01(\bR\n" +
+	"disableGSO\x120\n" +
+	"\x14max_incoming_streams\x18\x10 \x01(\x03R\x12maxIncomingStreams\x126\n" +
+	"\x17disable_stateless_reset\x18\x11 \x01(\bR\x15disableStatelessReset\"Q\n" +
 	"\vProxyConfig\x12\x10\n" +
 	"\x03tag\x18\x01 \x01(\tR\x03tag\x120\n" +
 	"\x13transportLayerProxy\x18\x02 \x01(\bR\x13transportLayerProxy\"\x93\x01\n" +

transport/internet/config.proto

@@ -75,15 +75,19 @@ message QuicParams {
   string bbr_profile = 2;
   uint64 brutal_up = 3;
   uint64 brutal_down = 4;
-  UdpHop udp_hop = 5;
-  uint64 init_stream_receive_window = 6;
-  uint64 max_stream_receive_window = 7;
-  uint64 init_conn_receive_window = 8;
-  uint64 max_conn_receive_window = 9;
-  int64 max_idle_timeout = 10;
-  int64 keep_alive_period = 11;
-  bool disable_path_mtu_discovery = 12;
-  int64 max_incoming_streams = 13;
+  bool brutal_disable_loss_compensation = 5;
+  UdpHop udp_hop = 6;
+  uint64 init_stream_receive_window = 7;
+  uint64 max_stream_receive_window = 8;
+  uint64 init_conn_receive_window = 9;
+  uint64 max_conn_receive_window = 10;
+  int64 max_idle_timeout = 11;
+  int64 keep_alive_period = 12;
+  bool disable_path_mtu_discovery = 13;
+  bool disable_chrome_parrot = 14;
+  bool disableGSO = 15;
+  int64 max_incoming_streams = 16;
+  bool disable_stateless_reset = 17;    
 }
 
 message ProxyConfig {

transport/internet/finalmask/realm/client.go

@@ -7,6 +7,7 @@ import (
 	"net/netip"
 	"slices"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/pion/stun/v3"
@@ -15,35 +16,67 @@ import (
 )
 
 type realmConnClient struct {
+	wg     sync.WaitGroup
+	ctx    context.Context
+	cancel context.CancelFunc
 	net.PacketConn
 	peer *net.UDPAddr
 
 	realmClient   *Client
 	realmID       string
 	stunServers   []string
+	family        Family
+	mapper        *PortMapper
 	stunTimeout   time.Duration
 	punchTimeout  time.Duration
 	punchInterval time.Duration
 }
 
 func NewConnClient(config *Config, raw net.PacketConn) (net.PacketConn, error) {
+	ctx, cancel := context.WithCancel(context.Background())
+
+	family := Family_Dual
+	switch config.IPMode {
+	case "dual":
+	case "v4":
+		family = Family_V4
+	case "v6":
+		family = Family_V6
+	}
+
+	var mapper *PortMapper
+	if config.PortMapping != nil && config.PortMapping.Enabled {
+		var err error
+		start := time.Now()
+		mapper, err = NewPortMapper(context.Background(), raw.LocalAddr().(*net.UDPAddr).Port, PortMapConfig{Timeout: time.Duration(config.PortMapping.Timeout) * time.Second, Lifetime: time.Duration(config.PortMapping.Lifetime) * time.Second})
+		if err != nil {
+			errors.LogErrorInner(context.Background(), err, "[realm] [port mapping] [", raw.LocalAddr().(*net.UDPAddr).Port, "] init failed after ", time.Since(start))
+		} else {
+			errors.LogDebug(context.Background(), "[realm] [port mapping] [", mapper.InternalPort(), "] gateway ", mapper.GatewayType(), ", external ", mapper.ExternalAddr())
+			errors.LogDebug(context.Background(), "[realm] [port mapping] [", mapper.InternalPort(), "] init success with ", time.Since(start))
+		}
+	}
+
 	conn := &realmConnClient{
+		ctx:        ctx,
+		cancel:     cancel,
 		PacketConn: raw,
 
 		realmClient:   NewClient(config.Scheme, config.Host, config.Port, config.Token, config.TlsConfig),
 		realmID:       config.ID,
 		stunServers:   config.StunServers,
+		family:        family,
+		mapper:        mapper,
 		stunTimeout:   defaultSTUNTimeout,
 		punchTimeout:  defaultPunchTimeout,
 		punchInterval: defaultPunchInterval,
 	}
-
 	return conn.getpeer()
 }
 
 func (c *realmConnClient) getpeer() (net.PacketConn, error) {
 	start := time.Now()
-	servers := resolveSTUNServers(c.PacketConn.LocalAddr().(*net.UDPAddr).IP, c.stunServers)
+	servers := resolveSTUNServers(c.PacketConn.LocalAddr().(*net.UDPAddr).IP, c.stunServers, c.family)
 	errors.LogDebug(context.Background(), "[realm] update stun servers ", servers, " with ", time.Since(start))
 	if len(servers) == 0 {
 		return nil, errors.New("empty locals")
@@ -70,7 +103,7 @@ func (c *realmConnClient) getpeer() (net.PacketConn, error) {
 
 	peers, _ := parseAddrPorts(resp.Addresses)
 	errors.LogDebug(context.Background(), "[realm] update peers ", peers)
-	filteredPeers, seen := candidatePunchAddrs(locals, peers)
+	filteredPeers, seen := candidatePunchAddrs(locals, peers, c.family)
 	errors.LogDebug(context.Background(), "[realm] filtered peers ", filteredPeers)
 	expandedPeers := expandSymmetricNATCandidates(filteredPeers, seen)
 	errors.LogDebug(context.Background(), "[realm] expanded peers ", expandedPeers)
@@ -86,6 +119,11 @@ func (c *realmConnClient) getpeer() (net.PacketConn, error) {
 	}
 	errors.LogDebug(context.Background(), "[realm] punch peer ", peer, " with ", time.Since(start))
 
+	if c.mapper != nil {
+		c.wg.Add(1)
+		go portMapLoop(c.ctx, c.mapper, c.wg.Done)
+	}
+
 	c.peer = peer
 	return c, nil
 }
@@ -116,10 +154,12 @@ func (c *realmConnClient) discover(servers []*net.UDPAddr) []netip.AddrPort {
 		}
 	}
 	c.PacketConn.SetReadDeadline(time.Time{})
+	if c.mapper != nil {
+		results = insertAddr(results, c.mapper.ExternalAddr())
+	}
 	slices.SortFunc(results, func(a, b netip.AddrPort) int {
 		return strings.Compare(a.String(), b.String())
 	})
-
 	return results
 }
 
@@ -169,3 +209,48 @@ func (c *realmConnClient) punch(meta PunchMetadata, peers []netip.AddrPort) (*ne
 func (c *realmConnClient) WriteTo(p []byte, addr net.Addr) (n int, err error) {
 	return c.PacketConn.WriteTo(p, c.peer)
 }
+
+func (c *realmConnClient) Close() error {
+	// Sadly, closing the core does not first close the sockets created for outbound connections
+	c.cancel()
+	c.wg.Wait()
+	return nil
+}
+
+func portMapLoop(ctx context.Context, mapper *PortMapper, done func()) {
+	defer func() {
+		err := mapper.Close()
+		done()
+		errors.LogDebug(context.Background(), "[realm] [port mapping] [", mapper.InternalPort(), "] removed with ", err)
+	}()
+	interval := mapper.Lifetime() / 2
+	if interval <= 0 {
+		interval = time.Minute
+	}
+	t := time.NewTicker(interval)
+	defer t.Stop()
+	failing := false
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-t.C:
+			changed, err := mapper.Renew(ctx)
+			if err != nil {
+				if ctx.Err() != nil {
+					return
+				}
+				if !failing {
+					errors.LogError(context.Background(), "[realm] [port mapping] [", mapper.InternalPort(), "] renewal failed")
+					failing = true
+				}
+				continue
+			}
+			errors.LogDebug(context.Background(), "[realm] [port mapping] [", mapper.InternalPort(), "] external ", mapper.ExternalAddr(), ", changed ", changed)
+			if failing {
+				errors.LogError(context.Background(), "[realm] [port mapping] [", mapper.InternalPort(), "] recovered")
+				failing = false
+			}
+		}
+	}
+}

transport/internet/finalmask/realm/config.pb.go

@@ -22,6 +22,115 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+type Family int32
+
+const (
+	Family_Dual Family = 0
+	Family_V4   Family = 1
+	Family_V6   Family = 2
+)
+
+// Enum value maps for Family.
+var (
+	Family_name = map[int32]string{
+		0: "Dual",
+		1: "V4",
+		2: "V6",
+	}
+	Family_value = map[string]int32{
+		"Dual": 0,
+		"V4":   1,
+		"V6":   2,
+	}
+)
+
+func (x Family) Enum() *Family {
+	p := new(Family)
+	*p = x
+	return p
+}
+
+func (x Family) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (Family) Descriptor() protoreflect.EnumDescriptor {
+	return file_transport_internet_finalmask_realm_config_proto_enumTypes[0].Descriptor()
+}
+
+func (Family) Type() protoreflect.EnumType {
+	return &file_transport_internet_finalmask_realm_config_proto_enumTypes[0]
+}
+
+func (x Family) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use Family.Descriptor instead.
+func (Family) EnumDescriptor() ([]byte, []int) {
+	return file_transport_internet_finalmask_realm_config_proto_rawDescGZIP(), []int{0}
+}
+
+type PortMapping struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Enabled       bool                   `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	Timeout       int64                  `protobuf:"varint,2,opt,name=timeout,proto3" json:"timeout,omitempty"`
+	Lifetime      int64                  `protobuf:"varint,3,opt,name=lifetime,proto3" json:"lifetime,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *PortMapping) Reset() {
+	*x = PortMapping{}
+	mi := &file_transport_internet_finalmask_realm_config_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *PortMapping) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PortMapping) ProtoMessage() {}
+
+func (x *PortMapping) ProtoReflect() protoreflect.Message {
+	mi := &file_transport_internet_finalmask_realm_config_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PortMapping.ProtoReflect.Descriptor instead.
+func (*PortMapping) Descriptor() ([]byte, []int) {
+	return file_transport_internet_finalmask_realm_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *PortMapping) GetEnabled() bool {
+	if x != nil {
+		return x.Enabled
+	}
+	return false
+}
+
+func (x *PortMapping) GetTimeout() int64 {
+	if x != nil {
+		return x.Timeout
+	}
+	return 0
+}
+
+func (x *PortMapping) GetLifetime() int64 {
+	if x != nil {
+		return x.Lifetime
+	}
+	return 0
+}
+
 type Config struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	Scheme        string                 `protobuf:"bytes,1,opt,name=scheme,proto3" json:"scheme,omitempty"`
@@ -31,13 +140,15 @@ type Config struct {
 	ID            string                 `protobuf:"bytes,5,opt,name=ID,proto3" json:"ID,omitempty"`
 	StunServers   []string               `protobuf:"bytes,6,rep,name=stun_servers,json=stunServers,proto3" json:"stun_servers,omitempty"`
 	TlsConfig     *tls.Config            `protobuf:"bytes,7,opt,name=tls_config,json=tlsConfig,proto3" json:"tls_config,omitempty"`
+	IPMode        string                 `protobuf:"bytes,8,opt,name=IPMode,proto3" json:"IPMode,omitempty"`
+	PortMapping   *PortMapping           `protobuf:"bytes,9,opt,name=port_mapping,json=portMapping,proto3" json:"port_mapping,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
 
 func (x *Config) Reset() {
 	*x = Config{}
-	mi := &file_transport_internet_finalmask_realm_config_proto_msgTypes[0]
+	mi := &file_transport_internet_finalmask_realm_config_proto_msgTypes[1]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -49,7 +160,7 @@ func (x *Config) String() string {
 func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_transport_internet_finalmask_realm_config_proto_msgTypes[0]
+	mi := &file_transport_internet_finalmask_realm_config_proto_msgTypes[1]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -62,7 +173,7 @@ func (x *Config) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Config.ProtoReflect.Descriptor instead.
 func (*Config) Descriptor() ([]byte, []int) {
-	return file_transport_internet_finalmask_realm_config_proto_rawDescGZIP(), []int{0}
+	return file_transport_internet_finalmask_realm_config_proto_rawDescGZIP(), []int{1}
 }
 
 func (x *Config) GetScheme() string {
@@ -114,11 +225,29 @@ func (x *Config) GetTlsConfig() *tls.Config {
 	return nil
 }
 
+func (x *Config) GetIPMode() string {
+	if x != nil {
+		return x.IPMode
+	}
+	return ""
+}
+
+func (x *Config) GetPortMapping() *PortMapping {
+	if x != nil {
+		return x.PortMapping
+	}
+	return nil
+}
+
 var File_transport_internet_finalmask_realm_config_proto protoreflect.FileDescriptor
 
 const file_transport_internet_finalmask_realm_config_proto_rawDesc = "" +
 	"\n" +
-	"/transport/internet/finalmask/realm/config.proto\x12'xray.transport.internet.finalmask.realm\x1a#transport/internet/tls/config.proto\"\xd5\x01\n" +
+	"/transport/internet/finalmask/realm/config.proto\x12'xray.transport.internet.finalmask.realm\x1a#transport/internet/tls/config.proto\"]\n" +
+	"\vPortMapping\x12\x18\n" +
+	"\aenabled\x18\x01 \x01(\bR\aenabled\x12\x18\n" +
+	"\atimeout\x18\x02 \x01(\x03R\atimeout\x12\x1a\n" +
+	"\blifetime\x18\x03 \x01(\x03R\blifetime\"\xc6\x02\n" +
 	"\x06Config\x12\x16\n" +
 	"\x06scheme\x18\x01 \x01(\tR\x06scheme\x12\x12\n" +
 	"\x04host\x18\x02 \x01(\tR\x04host\x12\x12\n" +
@@ -127,7 +256,13 @@ const file_transport_internet_finalmask_realm_config_proto_rawDesc = "" +
 	"\x02ID\x18\x05 \x01(\tR\x02ID\x12!\n" +
 	"\fstun_servers\x18\x06 \x03(\tR\vstunServers\x12B\n" +
 	"\n" +
-	"tls_config\x18\a \x01(\v2#.xray.transport.internet.tls.ConfigR\ttlsConfigB\x97\x01\n" +
+	"tls_config\x18\a \x01(\v2#.xray.transport.internet.tls.ConfigR\ttlsConfig\x12\x16\n" +
+	"\x06IPMode\x18\b \x01(\tR\x06IPMode\x12W\n" +
+	"\fport_mapping\x18\t \x01(\v24.xray.transport.internet.finalmask.realm.PortMappingR\vportMapping*\"\n" +
+	"\x06Family\x12\b\n" +
+	"\x04Dual\x10\x00\x12\x06\n" +
+	"\x02V4\x10\x01\x12\x06\n" +
+	"\x02V6\x10\x02B\x97\x01\n" +
 	"+com.xray.transport.internet.finalmask.realmP\x01Z<github.com/xtls/xray-core/transport/internet/finalmask/realm\xaa\x02'Xray.Transport.Internet.Finalmask.Realmb\x06proto3"
 
 var (
@@ -142,18 +277,22 @@ func file_transport_internet_finalmask_realm_config_proto_rawDescGZIP() []byte {
 	return file_transport_internet_finalmask_realm_config_proto_rawDescData
 }
 
-var file_transport_internet_finalmask_realm_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_realm_config_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_transport_internet_finalmask_realm_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
 var file_transport_internet_finalmask_realm_config_proto_goTypes = []any{
-	(*Config)(nil),     // 0: xray.transport.internet.finalmask.realm.Config
-	(*tls.Config)(nil), // 1: xray.transport.internet.tls.Config
+	(Family)(0),         // 0: xray.transport.internet.finalmask.realm.Family
+	(*PortMapping)(nil), // 1: xray.transport.internet.finalmask.realm.PortMapping
+	(*Config)(nil),      // 2: xray.transport.internet.finalmask.realm.Config
+	(*tls.Config)(nil),  // 3: xray.transport.internet.tls.Config
 }
 var file_transport_internet_finalmask_realm_config_proto_depIdxs = []int32{
-	1, // 0: xray.transport.internet.finalmask.realm.Config.tls_config:type_name -> xray.transport.internet.tls.Config
-	1, // [1:1] is the sub-list for method output_type
-	1, // [1:1] is the sub-list for method input_type
-	1, // [1:1] is the sub-list for extension type_name
-	1, // [1:1] is the sub-list for extension extendee
-	0, // [0:1] is the sub-list for field type_name
+	3, // 0: xray.transport.internet.finalmask.realm.Config.tls_config:type_name -> xray.transport.internet.tls.Config
+	1, // 1: xray.transport.internet.finalmask.realm.Config.port_mapping:type_name -> xray.transport.internet.finalmask.realm.PortMapping
+	2, // [2:2] is the sub-list for method output_type
+	2, // [2:2] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
 }
 
 func init() { file_transport_internet_finalmask_realm_config_proto_init() }
@@ -166,13 +305,14 @@ func file_transport_internet_finalmask_realm_config_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_realm_config_proto_rawDesc), len(file_transport_internet_finalmask_realm_config_proto_rawDesc)),
-			NumEnums:      0,
-			NumMessages:   1,
+			NumEnums:      1,
+			NumMessages:   2,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
 		GoTypes:           file_transport_internet_finalmask_realm_config_proto_goTypes,
 		DependencyIndexes: file_transport_internet_finalmask_realm_config_proto_depIdxs,
+		EnumInfos:         file_transport_internet_finalmask_realm_config_proto_enumTypes,
 		MessageInfos:      file_transport_internet_finalmask_realm_config_proto_msgTypes,
 	}.Build()
 	File_transport_internet_finalmask_realm_config_proto = out.File

transport/internet/finalmask/realm/config.proto

@@ -8,6 +8,18 @@ option java_multiple_files = true;
 
 import "transport/internet/tls/config.proto";
 
+enum Family {
+  Dual = 0;
+  V4 = 1;
+  V6 = 2;
+}
+
+message PortMapping {
+  bool enabled = 1;
+  int64 timeout = 2;
+  int64 lifetime = 3;
+}
+
 message Config {
   string scheme = 1;
   string host = 2;
@@ -16,4 +28,6 @@ message Config {
   string ID = 5;
   repeated string stun_servers = 6;
   xray.transport.internet.tls.Config tls_config = 7;
+  string IPMode = 8;
+  PortMapping port_mapping = 9;
 }

transport/internet/finalmask/realm/portmap.go

@@ -0,0 +1,139 @@
+package realm
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/netip"
+	"sync"
+	"time"
+
+	"github.com/libp2p/go-nat"
+)
+
+const (
+	defaultPortMapTimeout  = 10 * time.Second
+	defaultPortMapLifetime = 10 * time.Minute
+
+	portMapDescription = "hysteria-realm"
+	portMapProtocol    = "udp"
+)
+
+var ErrInvalidPortMapConfig = errors.New("invalid port mapping config")
+
+type PortMapConfig struct {
+	Timeout  time.Duration
+	Lifetime time.Duration
+}
+
+func (c PortMapConfig) withDefaults() (PortMapConfig, error) {
+	if c.Timeout == 0 {
+		c.Timeout = defaultPortMapTimeout
+	}
+	if c.Timeout < 0 {
+		return c, fmt.Errorf("%w: timeout must not be negative", ErrInvalidPortMapConfig)
+	}
+	if c.Lifetime == 0 {
+		c.Lifetime = defaultPortMapLifetime
+	}
+	if c.Lifetime < 0 {
+		return c, fmt.Errorf("%w: lifetime must not be negative", ErrInvalidPortMapConfig)
+	}
+	return c, nil
+}
+
+// PortMapper maintains a UDP port mapping on the local gateway via UPnP or
+// NAT-PMP. It does not renew the mapping by itself; the caller is expected
+// to call Renew periodically (typically every Lifetime/2).
+type PortMapper struct {
+	gateway      nat.NAT
+	internalPort int
+	config       PortMapConfig
+
+	mu           sync.Mutex
+	externalAddr netip.AddrPort
+}
+
+// NewPortMapper discovers the local gateway and maps internalPort for UDP.
+// It blocks for up to 2x config.Timeout (discovery + mapping).
+func NewPortMapper(ctx context.Context, internalPort int, config PortMapConfig) (*PortMapper, error) {
+	if internalPort <= 0 || internalPort > 65535 {
+		return nil, fmt.Errorf("%w: invalid internal port %d", ErrInvalidPortMapConfig, internalPort)
+	}
+	config, err := config.withDefaults()
+	if err != nil {
+		return nil, err
+	}
+
+	discoverCtx, cancel := context.WithTimeout(ctx, config.Timeout)
+	gateway, err := nat.DiscoverGateway(discoverCtx)
+	cancel()
+	if err != nil {
+		return nil, fmt.Errorf("gateway discovery failed: %w", err)
+	}
+
+	m := &PortMapper{
+		gateway:      gateway,
+		internalPort: internalPort,
+		config:       config,
+	}
+	if _, err := m.Renew(ctx); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// Renew (re-)requests the port mapping and refreshes the external address.
+// It reports whether the external address changed since the last call.
+func (m *PortMapper) Renew(ctx context.Context) (bool, error) {
+	opCtx, cancel := context.WithTimeout(ctx, m.config.Timeout)
+	defer cancel()
+	externalPort, err := m.gateway.AddPortMapping(opCtx, portMapProtocol, m.internalPort, portMapDescription, m.config.Lifetime)
+	if err != nil {
+		return false, fmt.Errorf("add port mapping failed: %w", err)
+	}
+	externalIP, err := m.gateway.GetExternalAddress()
+	if err != nil {
+		return false, fmt.Errorf("get external address failed: %w", err)
+	}
+	addr, ok := netip.AddrFromSlice(externalIP)
+	if !ok || addr.IsUnspecified() || addr.IsLoopback() {
+		return false, fmt.Errorf("gateway returned unusable external address: %s", externalIP)
+	}
+	externalAddr := netip.AddrPortFrom(addr.Unmap(), uint16(externalPort))
+
+	m.mu.Lock()
+	changed := externalAddr != m.externalAddr
+	m.externalAddr = externalAddr
+	m.mu.Unlock()
+	return changed, nil
+}
+
+// ExternalAddr returns the gateway's external IP and the mapped external port.
+func (m *PortMapper) ExternalAddr() netip.AddrPort {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.externalAddr
+}
+
+// InternalPort returns the mapped local UDP port.
+func (m *PortMapper) InternalPort() int {
+	return m.internalPort
+}
+
+// Lifetime returns the effective mapping lease duration.
+func (m *PortMapper) Lifetime() time.Duration {
+	return m.config.Lifetime
+}
+
+// GatewayType returns the protocol used to talk to the gateway ("UPnP" or "NAT-PMP").
+func (m *PortMapper) GatewayType() string {
+	return m.gateway.Type()
+}
+
+// Close removes the port mapping from the gateway. Best-effort.
+func (m *PortMapper) Close() error {
+	ctx, cancel := context.WithTimeout(context.Background(), m.config.Timeout)
+	defer cancel()
+	return m.gateway.DeletePortMapping(ctx, portMapProtocol, m.internalPort)
+}

transport/internet/finalmask/realm/server.go

@@ -33,14 +33,16 @@ type STUNPacketEvent struct {
 }
 
 type realmConnServer struct {
-	cleaned chan struct{}
-	ctx     context.Context
-	cancel  context.CancelFunc
+	wg     sync.WaitGroup
+	ctx    context.Context
+	cancel context.CancelFunc
 	net.PacketConn
 
 	realmClient   *Client
 	realmID       string
 	stunServers   []string
+	family        Family
+	mapper        *PortMapper
 	stunTimeout   time.Duration
 	punchTimeout  time.Duration
 	punchInterval time.Duration
@@ -57,8 +59,29 @@ type realmConnServer struct {
 func NewConnServer(config *Config, raw net.PacketConn) (net.PacketConn, error) {
 	ctx, cancel := context.WithCancel(context.Background())
 
+	family := Family_Dual
+	switch config.IPMode {
+	case "dual":
+	case "v4":
+		family = Family_V4
+	case "v6":
+		family = Family_V6
+	}
+
+	var mapper *PortMapper
+	if config.PortMapping != nil && config.PortMapping.Enabled {
+		var err error
+		start := time.Now()
+		mapper, err = NewPortMapper(context.Background(), raw.LocalAddr().(*net.UDPAddr).Port, PortMapConfig{Timeout: time.Duration(config.PortMapping.Timeout) * time.Second, Lifetime: time.Duration(config.PortMapping.Lifetime) * time.Second})
+		if err != nil {
+			errors.LogErrorInner(context.Background(), err, "[realm] [port mapping] [", raw.LocalAddr().(*net.UDPAddr).Port, "] init failed after ", time.Since(start))
+		} else {
+			errors.LogDebug(context.Background(), "[realm] [port mapping] [", mapper.InternalPort(), "] gateway ", mapper.GatewayType(), ", external ", mapper.ExternalAddr())
+			errors.LogDebug(context.Background(), "[realm] [port mapping] [", mapper.InternalPort(), "] init success with ", time.Since(start))
+		}
+	}
+
 	conn := &realmConnServer{
-		cleaned:    make(chan struct{}),
 		ctx:        ctx,
 		cancel:     cancel,
 		PacketConn: raw,
@@ -66,6 +89,8 @@ func NewConnServer(config *Config, raw net.PacketConn) (net.PacketConn, error) {
 		realmClient:   NewClient(config.Scheme, config.Host, config.Port, config.Token, config.TlsConfig),
 		realmID:       config.ID,
 		stunServers:   config.StunServers,
+		family:        family,
+		mapper:        mapper,
 		stunTimeout:   defaultSTUNTimeout,
 		punchTimeout:  defaultPunchTimeout,
 		punchInterval: defaultPunchInterval,
@@ -74,6 +99,12 @@ func NewConnServer(config *Config, raw net.PacketConn) (net.PacketConn, error) {
 		stun:   make(chan STUNPacketEvent, defaultEventBuffer),
 	}
 
+	if mapper != nil {
+		conn.wg.Add(1)
+		go portMapLoop(ctx, mapper, conn.wg.Done)
+	}
+
+	conn.wg.Add(1)
 	go conn.run()
 
 	return conn, nil
@@ -137,6 +168,8 @@ func (c *realmConnServer) discover(servers []*net.UDPAddr) []netip.AddrPort {
 	results := make([]netip.AddrPort, 0, len(servers))
 	for len(transactionIDs) > 0 {
 		select {
+		case <-c.ctx.Done():
+			goto end
 		case <-deadline.C:
 			goto end
 		case ev := <-c.stun:
@@ -148,6 +181,9 @@ func (c *realmConnServer) discover(servers []*net.UDPAddr) []netip.AddrPort {
 	}
 end:
 	deadline.Stop()
+	if c.mapper != nil {
+		results = insertAddr(results, c.mapper.ExternalAddr())
+	}
 	slices.SortFunc(results, func(a, b netip.AddrPort) int {
 		return strings.Compare(a.String(), b.String())
 	})
@@ -159,7 +195,7 @@ func (c *realmConnServer) getlocals(force bool) []netip.AddrPort {
 	c.localsMu.Lock()
 	if force || time.Since(c.localsLast) > defaultStunCacheTTL {
 		start := time.Now()
-		servers := resolveSTUNServers(c.PacketConn.LocalAddr().(*net.UDPAddr).IP, c.stunServers)
+		servers := resolveSTUNServers(c.PacketConn.LocalAddr().(*net.UDPAddr).IP, c.stunServers, c.family)
 		errors.LogDebug(context.Background(), "[realm] update stun servers ", servers, " with ", time.Since(start))
 		if len(servers) > 0 {
 			start = time.Now()
@@ -232,7 +268,7 @@ retry:
 	if err != nil {
 		errors.LogErrorInner(context.Background(), err, "[realm] ", c.realmID, " register session err retry in ", backoff)
 		if c.waitctx(c.ctx, backoff) {
-			close(c.cleaned)
+			c.wg.Done()
 			return
 		}
 		backoff *= 2
@@ -259,7 +295,7 @@ retry:
 	case <-c.ctx.Done():
 		_ = c.realmClient.Deregister(context.Background(), c.realmID, resp.SessionID)
 		errors.LogDebug(context.Background(), "[realm] ", c.realmID, " ", resp.SessionID, " deregistered")
-		close(c.cleaned)
+		c.wg.Done()
 		return
 	default:
 		goto retry
@@ -360,7 +396,7 @@ func (c *realmConnServer) punchEvent(ctx context.Context, sid string, ev *PunchE
 
 	peers, _ := parseAddrPorts(ev.Addresses)
 	errors.LogDebug(context.Background(), "[realm] ", ev.Nonce, " update peers ", peers)
-	filteredPeers, seen := candidatePunchAddrs(locals, peers)
+	filteredPeers, seen := candidatePunchAddrs(locals, peers, c.family)
 	errors.LogDebug(context.Background(), "[realm] ", ev.Nonce, " filtered peers ", filteredPeers)
 	expandedPeers := expandSymmetricNATCandidates(filteredPeers, seen)
 	errors.LogDebug(context.Background(), "[realm] ", ev.Nonce, " expanded peers ", expandedPeers)
@@ -398,6 +434,6 @@ func (c *realmConnServer) ReadFrom(p []byte) (int, net.Addr, error) {
 
 func (c *realmConnServer) Close() error {
 	c.cancel()
-	<-c.cleaned
+	c.wg.Wait()
 	return c.PacketConn.Close()
 }

transport/internet/finalmask/realm/stun.go

@@ -23,14 +23,23 @@ const (
 	symmetricNATMaxPortsPerHost = 32
 )
 
-func resolveSTUNServers(local net.IP, servers []string) []*net.UDPAddr {
+func resolveSTUNServers(local net.IP, servers []string, family Family) []*net.UDPAddr {
 	var network string
-	if local.IsUnspecified() {
-		network = "ip"
-	} else {
-		if local.To4() != nil {
-			network = "ip4"
+	if family == Family_Dual {
+		if local.IsUnspecified() {
+			network = "ip"
 		} else {
+			if local.To4() != nil {
+				network = "ip4"
+			} else {
+				network = "ip6"
+			}
+		}
+	} else {
+		if family == Family_V4 {
+			network = "ip4"
+		}
+		if family == Family_V6 {
 			network = "ip6"
 		}
 	}
@@ -104,7 +113,7 @@ func netIPPortToAddrPort(ip net.IP, port int) (netip.AddrPort, error) {
 	return netip.AddrPortFrom(netip.AddrFrom16(addr), uint16(port)), nil
 }
 
-func candidatePunchAddrs(locals, peers []netip.AddrPort) ([]netip.AddrPort, map[netip.AddrPort]struct{}) {
+func candidatePunchAddrs(locals, peers []netip.AddrPort, family Family) ([]netip.AddrPort, map[netip.AddrPort]struct{}) {
 	var allow4, allow6 bool
 	for _, local := range locals {
 		if local.Addr().Is4() {
@@ -116,6 +125,12 @@ func candidatePunchAddrs(locals, peers []netip.AddrPort) ([]netip.AddrPort, map[
 			break
 		}
 	}
+	if family == Family_V4 {
+		allow6 = false
+	}
+	if family == Family_V6 {
+		allow4 = false
+	}
 	seen := make(map[netip.AddrPort]struct{}, len(peers))
 	candidates := make([]netip.AddrPort, 0, len(peers))
 	for _, peer := range peers {
@@ -218,3 +233,17 @@ func parseAddrPorts(addrs []string) ([]netip.AddrPort, error) {
 	}
 	return out, nil
 }
+
+func insertAddr(addrs []netip.AddrPort, addr netip.AddrPort) []netip.AddrPort {
+	if !addr.IsValid() {
+		return addrs
+	}
+	out := append([]netip.AddrPort(nil), addrs...)
+	i, found := slices.BinarySearchFunc(out, addr, func(a, b netip.AddrPort) int {
+		return strings.Compare(a.String(), b.String())
+	})
+	if found {
+		return out
+	}
+	return slices.Insert(out, i, addr)
+}

transport/internet/hysteria/config.pb.go

@@ -29,10 +29,11 @@ type Config struct {
 	MasqFile             string                 `protobuf:"bytes,5,opt,name=masq_file,json=masqFile,proto3" json:"masq_file,omitempty"`
 	MasqUrl              string                 `protobuf:"bytes,6,opt,name=masq_url,json=masqUrl,proto3" json:"masq_url,omitempty"`
 	MasqUrlRewriteHost   bool                   `protobuf:"varint,7,opt,name=masq_url_rewrite_host,json=masqUrlRewriteHost,proto3" json:"masq_url_rewrite_host,omitempty"`
-	MasqUrlInsecure      bool                   `protobuf:"varint,8,opt,name=masq_url_insecure,json=masqUrlInsecure,proto3" json:"masq_url_insecure,omitempty"`
-	MasqString           string                 `protobuf:"bytes,9,opt,name=masq_string,json=masqString,proto3" json:"masq_string,omitempty"`
-	MasqStringHeaders    map[string]string      `protobuf:"bytes,10,rep,name=masq_string_headers,json=masqStringHeaders,proto3" json:"masq_string_headers,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
-	MasqStringStatusCode int32                  `protobuf:"varint,11,opt,name=masq_string_status_code,json=masqStringStatusCode,proto3" json:"masq_string_status_code,omitempty"`
+	MasqUrlXForwarded    bool                   `protobuf:"varint,8,opt,name=masq_url_x_forwarded,json=masqUrlXForwarded,proto3" json:"masq_url_x_forwarded,omitempty"`
+	MasqUrlInsecure      bool                   `protobuf:"varint,9,opt,name=masq_url_insecure,json=masqUrlInsecure,proto3" json:"masq_url_insecure,omitempty"`
+	MasqString           string                 `protobuf:"bytes,10,opt,name=masq_string,json=masqString,proto3" json:"masq_string,omitempty"`
+	MasqStringHeaders    map[string]string      `protobuf:"bytes,11,rep,name=masq_string_headers,json=masqStringHeaders,proto3" json:"masq_string_headers,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
+	MasqStringStatusCode int32                  `protobuf:"varint,12,opt,name=masq_string_status_code,json=masqStringStatusCode,proto3" json:"masq_string_status_code,omitempty"`
 	unknownFields        protoimpl.UnknownFields
 	sizeCache            protoimpl.SizeCache
 }
@@ -109,6 +110,13 @@ func (x *Config) GetMasqUrlRewriteHost() bool {
 	return false
 }
 
+func (x *Config) GetMasqUrlXForwarded() bool {
+	if x != nil {
+		return x.MasqUrlXForwarded
+	}
+	return false
+}
+
 func (x *Config) GetMasqUrlInsecure() bool {
 	if x != nil {
 		return x.MasqUrlInsecure
@@ -141,20 +149,21 @@ var File_transport_internet_hysteria_config_proto protoreflect.FileDescriptor
 
 const file_transport_internet_hysteria_config_proto_rawDesc = "" +
 	"\n" +
-	"(transport/internet/hysteria/config.proto\x12 xray.transport.internet.hysteria\"\x8f\x04\n" +
+	"(transport/internet/hysteria/config.proto\x12 xray.transport.internet.hysteria\"\xc0\x04\n" +
 	"\x06Config\x12\x12\n" +
 	"\x04auth\x18\x02 \x01(\tR\x04auth\x12(\n" +
 	"\x10udp_idle_timeout\x18\x03 \x01(\x03R\x0eudpIdleTimeout\x12\x1b\n" +
 	"\tmasq_type\x18\x04 \x01(\tR\bmasqType\x12\x1b\n" +
 	"\tmasq_file\x18\x05 \x01(\tR\bmasqFile\x12\x19\n" +
 	"\bmasq_url\x18\x06 \x01(\tR\amasqUrl\x121\n" +
-	"\x15masq_url_rewrite_host\x18\a \x01(\bR\x12masqUrlRewriteHost\x12*\n" +
-	"\x11masq_url_insecure\x18\b \x01(\bR\x0fmasqUrlInsecure\x12\x1f\n" +
-	"\vmasq_string\x18\t \x01(\tR\n" +
+	"\x15masq_url_rewrite_host\x18\a \x01(\bR\x12masqUrlRewriteHost\x12/\n" +
+	"\x14masq_url_x_forwarded\x18\b \x01(\bR\x11masqUrlXForwarded\x12*\n" +
+	"\x11masq_url_insecure\x18\t \x01(\bR\x0fmasqUrlInsecure\x12\x1f\n" +
+	"\vmasq_string\x18\n" +
+	" \x01(\tR\n" +
 	"masqString\x12o\n" +
-	"\x13masq_string_headers\x18\n" +
-	" \x03(\v2?.xray.transport.internet.hysteria.Config.MasqStringHeadersEntryR\x11masqStringHeaders\x125\n" +
-	"\x17masq_string_status_code\x18\v \x01(\x05R\x14masqStringStatusCode\x1aD\n" +
+	"\x13masq_string_headers\x18\v \x03(\v2?.xray.transport.internet.hysteria.Config.MasqStringHeadersEntryR\x11masqStringHeaders\x125\n" +
+	"\x17masq_string_status_code\x18\f \x01(\x05R\x14masqStringStatusCode\x1aD\n" +
 	"\x16MasqStringHeadersEntry\x12\x10\n" +
 	"\x03key\x18\x01 \x01(\tR\x03key\x12\x14\n" +
 	"\x05value\x18\x02 \x01(\tR\x05value:\x028\x01J\x04\b\x01\x10\x02B\x82\x01\n" +

transport/internet/hysteria/config.proto

@@ -11,12 +11,17 @@ message Config {
   string auth = 2;
 
   int64 udp_idle_timeout = 3;
+
   string masq_type = 4;
+
   string masq_file = 5;
+
   string masq_url = 6;
   bool masq_url_rewrite_host = 7;
-  bool masq_url_insecure = 8;
-  string masq_string = 9;
-  map<string, string> masq_string_headers = 10;
-  int32 masq_string_status_code = 11;
+  bool masq_url_x_forwarded = 8;
+  bool masq_url_insecure = 9;
+
+  string masq_string = 10;
+  map<string, string> masq_string_headers = 11;
+  int32 masq_string_status_code = 12;
 }

transport/internet/hysteria/congestion/brutal/brutal.go

@@ -33,6 +33,8 @@ type BrutalSender struct {
 	pktInfoSlots [pktInfoSlotCount]pktInfo
 	ackRate      float64
 
+	disableLossCompensation bool
+
 	debug                 bool
 	lastAckPrintTimestamp int64
 }
@@ -43,13 +45,14 @@ type pktInfo struct {
 	LossCount uint64
 }
 
-func NewBrutalSender(bps uint64) *BrutalSender {
+func NewBrutalSender(bps uint64, disableLossCompensation bool) *BrutalSender {
 	debug, _ := strconv.ParseBool(os.Getenv(debugEnv))
 	bs := &BrutalSender{
-		bps:             congestion.ByteCount(bps),
-		maxDatagramSize: congestion.InitialPacketSize,
-		ackRate:         1,
-		debug:           debug,
+		bps:                     congestion.ByteCount(bps),
+		maxDatagramSize:         congestion.InitialPacketSize,
+		ackRate:                 1,
+		disableLossCompensation: disableLossCompensation,
+		debug:                   debug,
 	}
 	bs.pacer = common.NewPacer(func() congestion.ByteCount {
 		return congestion.ByteCount(float64(bs.bps) / bs.ackRate)
@@ -127,6 +130,10 @@ func (b *BrutalSender) SetMaxDatagramSize(size congestion.ByteCount) {
 }
 
 func (b *BrutalSender) updateAckRate(currentTimestamp int64) {
+	if b.disableLossCompensation {
+		b.ackRate = 1
+		return
+	}
 	minTimestamp := currentTimestamp - pktInfoSlotCount
 	var ackCount, lossCount uint64
 	for _, info := range b.pktInfoSlots {

transport/internet/hysteria/congestion/brutal/brutal_test.go

@@ -0,0 +1,45 @@
+package brutal
+
+import (
+	"testing"
+	"time"
+
+	"github.com/apernet/quic-go/congestion"
+	"github.com/apernet/quic-go/monotime"
+)
+
+// feedAckRate drives a single sampling slot with the given number of acked and
+// lost packets and returns the resulting ackRate.
+func feedAckRate(disableLossCompensation bool, ackCount, lossCount int) float64 {
+	b := NewBrutalSender(1000000, disableLossCompensation)
+	acked := make([]congestion.AckedPacketInfo, ackCount)
+	lost := make([]congestion.LostPacketInfo, lossCount)
+	// eventTime lands in a fixed slot; a single event carries enough samples.
+	b.OnCongestionEventEx(0, monotime.Time(5*time.Second), acked, lost)
+	return b.ackRate
+}
+
+func TestBrutalLossCompensation(t *testing.T) {
+	tests := []struct {
+		name      string
+		ack, loss int
+		want      float64 // expected ackRate when compensation is ENABLED
+	}{
+		{"no loss", 100, 0, 1.0},
+		{"20% loss", 80, 20, 0.8},
+		{"50% loss clamps to floor", 50, 50, minAckRate}, // 0.5 clamped up to 0.8
+		{"few samples stays 1", 10, 5, 1.0},              // below minSampleCount
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Compensation enabled (default behavior): ackRate reacts to loss.
+			if got := feedAckRate(false, tt.ack, tt.loss); got != tt.want {
+				t.Errorf("compensation on: ackRate = %v, want %v", got, tt.want)
+			}
+			// Compensation disabled: ackRate must stay pinned at 1 regardless.
+			if got := feedAckRate(true, tt.ack, tt.loss); got != 1.0 {
+				t.Errorf("compensation off: ackRate = %v, want 1.0", got)
+			}
+		})
+	}
+}

transport/internet/hysteria/congestion/utils.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/apernet/quic-go"
+	"github.com/apernet/quic-go/congestion"
 	"github.com/xtls/xray-core/transport/internet/hysteria/congestion/bbr"
 	"github.com/xtls/xray-core/transport/internet/hysteria/congestion/brutal"
 )
@@ -36,13 +37,29 @@ func NormalizeBBRProfile(profile string) (string, error) {
 func UseBBR(conn *quic.Conn, profile bbr.Profile) {
 	conn.SetCongestionControl(bbr.NewBbrSender(
 		bbr.DefaultClock{},
-		bbr.GetInitialPacketSize(conn.RemoteAddr()),
+		seedPacketSize(conn.InitialPacketSize(), bbr.GetInitialPacketSize(conn.RemoteAddr())),
 		profile,
 	))
 }
 
-func UseBrutal(conn *quic.Conn, tx uint64) {
-	conn.SetCongestionControl(brutal.NewBrutalSender(tx))
+// seedPacketSize picks the datagram size to seed a replacement congestion
+// controller with, given the size QUIC itself starts at and the guess derived
+// from the remote address.
+//
+// The seed must not exceed what QUIC actually starts at. If it does, the first
+// path MTU probe can land between the two: QUIC sees an increase and reports
+// it, but the controller sees a decrease, which it cannot represent. Taking the
+// smaller of the two keeps the address-based guess as a floor for connections
+// whose path we can't reason about, while never seeding above QUIC.
+func seedPacketSize(quicSize, byAddr congestion.ByteCount) congestion.ByteCount {
+	if quicSize <= 0 {
+		return byAddr
+	}
+	return min(quicSize, byAddr)
+}
+
+func UseBrutal(conn *quic.Conn, tx uint64, disableLossCompensation bool) {
+	conn.SetCongestionControl(brutal.NewBrutalSender(tx, disableLossCompensation))
 }
 
 func UseConfigured(conn *quic.Conn, congestionType, bbrProfile string) {

transport/internet/hysteria/dialer.go

@@ -90,6 +90,7 @@ func (c *client) dial(ctx context.Context) error {
 		MaxIdleTimeout:                 time.Duration(quicParams.MaxIdleTimeout) * time.Second,
 		KeepAlivePeriod:                time.Duration(quicParams.KeepAlivePeriod) * time.Second,
 		DisablePathMTUDiscovery:        quicParams.DisablePathMtuDiscovery || (runtime.GOOS != "linux" && runtime.GOOS != "windows" && runtime.GOOS != "darwin"),
+		ChromeParrot:                   !quicParams.DisableChromeParrot,
 		EnableDatagrams:                true,
 		MaxDatagramFrameSize:           MaxDatagramFrameSize,
 		OmitMaxDatagramFrameSize:       time.Now().After(time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC)),
@@ -172,7 +173,12 @@ func (c *client) dial(ctx context.Context) error {
 		pktConn = newConn
 	}
 
-	tr := &quic.Transport{Conn: pktConn}
+	tr := &quic.Transport{Conn: pktConn, DisableGSO: quicParams.DisableGSO}
+
+	if !quicParams.DisableChromeParrot {
+		tr.ConnectionIDGenerator = quic.ZeroLengthConnectionIDGenerator{}
+		c.tlsConfig.GetCertificate = nil
+	}
 
 	var conn *quic.Conn
 	rt := &http3.Transport{
@@ -219,6 +225,7 @@ func (c *client) dial(ctx context.Context) error {
 
 	// udp, _ := strconv.ParseBool(resp.Header.Get(ResponseHeaderUDPEnabled))
 	down, _ := strconv.ParseUint(resp.Header.Get(CommonHeaderCCRX), 10, 64)
+	errors.LogDebug(context.Background(), "ECHAccepted ", conn.ConnectionState().TLS.ECHAccepted)
 
 	switch quicParams.Congestion {
 	case "reno":
@@ -228,10 +235,10 @@ func (c *client) dial(ctx context.Context) error {
 		if quicParams.BrutalUp == 0 || down == 0 {
 			congestion.UseBBR(conn, bbr.Profile(quicParams.BbrProfile))
 		} else {
-			congestion.UseBrutal(conn, min(quicParams.BrutalUp, down))
+			congestion.UseBrutal(conn, min(quicParams.BrutalUp, down), quicParams.BrutalDisableLossCompensation)
 		}
 	case "force-brutal":
-		congestion.UseBrutal(conn, quicParams.BrutalUp)
+		congestion.UseBrutal(conn, quicParams.BrutalUp, quicParams.BrutalDisableLossCompensation)
 	default:
 		panic(quicParams.Congestion)
 	}

transport/internet/hysteria/hub.go

@@ -2,6 +2,7 @@ package hysteria
 
 import (
 	"context"
+	"crypto/rand"
 	gotls "crypto/tls"
 	"net/http"
 	"net/http/httputil"
@@ -78,10 +79,10 @@ func (h *httpHandler) AuthHTTP(w http.ResponseWriter, r *http.Request) bool {
 				if quicParams.BrutalUp == 0 || down == 0 {
 					congestion.UseBBR(conn, bbr.Profile(quicParams.BbrProfile))
 				} else {
-					congestion.UseBrutal(conn, min(quicParams.BrutalUp, down))
+					congestion.UseBrutal(conn, min(quicParams.BrutalUp, down), quicParams.BrutalDisableLossCompensation)
 				}
 			case "force-brutal":
-				congestion.UseBrutal(conn, quicParams.BrutalUp)
+				congestion.UseBrutal(conn, quicParams.BrutalUp, quicParams.BrutalDisableLossCompensation)
 			default:
 				panic(quicParams.Congestion)
 			}
@@ -165,8 +166,9 @@ func (l *Listener) handleClient(conn *quic.Conn) {
 		Handler:          handler,
 		StreamDispatcher: handler.StreamDispatcher,
 	}
-	_ = h3s.ServeQUICConn(conn)
+	err := h3s.ServeQUICConn(conn)
 	_ = conn.CloseWithError(closeErrCodeOK, "")
+	errors.LogDebug(context.Background(), conn.RemoteAddr(), " ServeQUICConn exited with ", err)
 }
 
 func (l *Listener) keepAccepting() {
@@ -219,21 +221,43 @@ func Listen(ctx context.Context, address net.Address, port net.Port, streamSetti
 			return nil, err
 		}
 		transport := http.DefaultTransport.(*http.Transport)
-		if config.MasqUrlInsecure {
-			transport = transport.Clone()
-			transport.TLSClientConfig = &gotls.Config{
-				InsecureSkipVerify: true,
+		switch u.Scheme {
+		case "http", "https":
+			if config.MasqUrlInsecure {
+				transport = transport.Clone()
+				if transport.TLSClientConfig == nil {
+					transport.TLSClientConfig = &gotls.Config{}
+				}
+				transport.TLSClientConfig.InsecureSkipVerify = true
 			}
+		case "", "unix":
+			u = &url.URL{Scheme: "http", Host: "localhost"}
+			path := u.Path
+			dialer := &net.Dialer{Timeout: 30 * time.Second}
+			transport = transport.Clone()
+			transport.Proxy = nil
+			transport.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+				return dialer.DialContext(ctx, "unix", path)
+			}
+			transport.MaxIdleConns = masqueradeProxyMaxIdleConnections
+			transport.MaxIdleConnsPerHost = masqueradeProxyMaxIdleConnsPerHost
+		default:
+			return nil, errors.New("unknown scheme")
 		}
 		masqHandler = &httputil.ReverseProxy{
-			Rewrite: func(pr *httputil.ProxyRequest) {
-				pr.SetURL(u)
+			Rewrite: func(r *httputil.ProxyRequest) {
+				r.SetURL(u)
 				if !config.MasqUrlRewriteHost {
-					pr.Out.Host = pr.In.Host
+					r.Out.Host = r.In.Host
+				}
+				if config.MasqUrlXForwarded {
+					r.SetXForwarded()
 				}
 			},
-			Transport: transport,
+			Transport:  transport,
+			BufferPool: newMasqueradeProxyBufferPool(),
 			ErrorHandler: func(w http.ResponseWriter, r *http.Request, err error) {
+				errors.LogErrorInner(context.Background(), err, "HTTP reverse proxy error")
 				w.WriteHeader(http.StatusBadGateway)
 			},
 		}
@@ -307,7 +331,13 @@ func Listen(ctx context.Context, address net.Address, port net.Port, streamSetti
 		pktConn = newConn
 	}
 
-	tr := &quic.Transport{Conn: pktConn}
+	var k *quic.StatelessResetKey
+	if !quicParams.DisableStatelessReset {
+		k = &quic.StatelessResetKey{}
+		common.Must2(rand.Read((*k)[:]))
+	}
+
+	tr := &quic.Transport{Conn: pktConn, DisableGSO: quicParams.DisableGSO, StatelessResetKey: k}
 
 	listener, err := tr.Listen(tlsConfig.GetTLSConfig(tls.WithNextProto("h3")), quicConfig)
 	if err != nil {
@@ -336,3 +366,34 @@ func Listen(ctx context.Context, address net.Address, port net.Port, streamSetti
 func init() {
 	common.Must(internet.RegisterTransportListener(protocolName, Listen))
 }
+
+const (
+	masqueradeProxyBufferSize          = 32 * 1024
+	masqueradeProxyMaxIdleConnections  = 100
+	masqueradeProxyMaxIdleConnsPerHost = 32
+)
+
+type masqueradeProxyBufferPool struct {
+	pool sync.Pool
+}
+
+func newMasqueradeProxyBufferPool() *masqueradeProxyBufferPool {
+	return &masqueradeProxyBufferPool{
+		pool: sync.Pool{
+			New: func() any {
+				return make([]byte, masqueradeProxyBufferSize)
+			},
+		},
+	}
+}
+
+func (p *masqueradeProxyBufferPool) Get() []byte {
+	return p.pool.Get().([]byte)
+}
+
+func (p *masqueradeProxyBufferPool) Put(buf []byte) {
+	if cap(buf) < masqueradeProxyBufferSize {
+		return
+	}
+	p.pool.Put(buf[:masqueradeProxyBufferSize])
+}

transport/internet/sockopt_linux.go

@@ -169,42 +169,41 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 				return errors.New("failed to set TCP_MAXSEG", err)
 			}
 		}
-	}
-
-	if len(config.CustomSockopt) > 0 {
-		for _, custom := range config.CustomSockopt {
-			if custom.System != "" && custom.System != runtime.GOOS {
-				errors.LogDebug(context.Background(), "CustomSockopt system not match: ", "want ", custom.System, " got ", runtime.GOOS)
-				continue
-			}
-			// Skip unwanted network type
-			// network might be tcp4 or tcp6
-			// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
-			// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
-			if !strings.HasPrefix(network, custom.Network) {
-				continue
-			}
-			level := 0x6 // default TCP
-			var opt int
-			if len(custom.Opt) == 0 {
-				return errors.New("No opt!")
-			} else {
-				opt, _ = strconv.Atoi(custom.Opt)
-			}
-			if custom.Level != "" {
-				level, _ = strconv.Atoi(custom.Level)
-			}
-			if custom.Type == "int" {
-				value, _ := strconv.Atoi(custom.Value)
-				if err := syscall.SetsockoptInt(int(fd), level, opt, value); err != nil {
-					return errors.New("failed to set CustomSockoptInt", opt, value, err)
+		if len(config.CustomSockopt) > 0 {
+			for _, custom := range config.CustomSockopt {
+				if custom.System != "" && custom.System != runtime.GOOS {
+					errors.LogDebug(context.Background(), "CustomSockopt system not match: ", "want ", custom.System, " got ", runtime.GOOS)
+					continue
 				}
-			} else if custom.Type == "str" {
-				if err := syscall.SetsockoptString(int(fd), level, opt, custom.Value); err != nil {
-					return errors.New("failed to set CustomSockoptString", opt, custom.Value, err)
+				// Skip unwanted network type
+				// network might be tcp4 or tcp6
+				// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
+				// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
+				if !strings.HasPrefix(network, custom.Network) {
+					continue
+				}
+				level := 0x6 // default TCP
+				var opt int
+				if len(custom.Opt) == 0 {
+					return errors.New("No opt!")
+				} else {
+					opt, _ = strconv.Atoi(custom.Opt)
+				}
+				if custom.Level != "" {
+					level, _ = strconv.Atoi(custom.Level)
+				}
+				if custom.Type == "int" {
+					value, _ := strconv.Atoi(custom.Value)
+					if err := syscall.SetsockoptInt(int(fd), level, opt, value); err != nil {
+						return errors.New("failed to set CustomSockoptInt", opt, value, err)
+					}
+				} else if custom.Type == "str" {
+					if err := syscall.SetsockoptString(int(fd), level, opt, custom.Value); err != nil {
+						return errors.New("failed to set CustomSockoptString", opt, custom.Value, err)
+					}
+				} else {
+					return errors.New("unknown CustomSockopt type:", custom.Type)
 				}
-			} else {
-				return errors.New("unknown CustomSockopt type:", custom.Type)
 			}
 		}
 	}

transport/internet/sockopt_openbsd.go

@@ -0,0 +1,40 @@
+//go:build openbsd
+// +build openbsd
+
+package internet
+
+import (
+	"github.com/xtls/xray-core/common/errors"
+	"golang.org/x/sys/unix"
+)
+
+func applyOutboundSocketOptions(network string, address string, fd uintptr, config *SocketConfig) error {
+	return nil
+}
+
+func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig) error {
+	if config.ReceiveOriginalDestAddress && isUDPSocket(network) {
+		// Only the options matching the socket's address family are accepted,
+		// so one of the two pairs succeeding is enough.
+		err6 := unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_RECVPKTINFO, 1)
+		if err6 == nil {
+			err6 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_RECVDSTPORT, 1)
+		}
+		err4 := unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_RECVDSTADDR, 1)
+		if err4 == nil {
+			err4 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_RECVDSTPORT, 1)
+		}
+		if err4 != nil && err6 != nil {
+			return errors.New("failed to enable receiving the original destination").Base(err4)
+		}
+	}
+	return nil
+}
+
+func setReuseAddr(fd uintptr) error {
+	return nil
+}
+
+func setReusePort(fd uintptr) error {
+	return nil
+}

transport/internet/sockopt_other.go

@@ -1,5 +1,5 @@
-//go:build js || netbsd || openbsd || solaris
-// +build js netbsd openbsd solaris
+//go:build js || netbsd || solaris
+// +build js netbsd solaris
 
 package internet
 

transport/internet/splithttp/client.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/http/httptrace"
 	"sync"
+	"sync/atomic"
 
 	"github.com/apernet/quic-go/http3"
 	"github.com/xtls/xray-core/common"
@@ -32,7 +33,7 @@ type DialerClient interface {
 type DefaultDialerClient struct {
 	transportConfig *Config
 	client          *http.Client
-	closed          bool
+	closed          atomic.Bool
 	httpVersion     string
 	// pool of net.Conn, created using dialUploadConn
 	uploadRawPool  *sync.Pool
@@ -40,7 +41,7 @@ type DefaultDialerClient struct {
 }
 
 func (c *DefaultDialerClient) IsClosed() bool {
-	return c.closed
+	return c.closed.Load()
 }
 
 func (c *DefaultDialerClient) OpenStream(ctx context.Context, url string, sessionId string, body io.Reader, uploadOnly bool) (wrc io.ReadCloser, remoteAddr, localAddr net.Addr, err error) {
@@ -72,7 +73,7 @@ func (c *DefaultDialerClient) OpenStream(ctx context.Context, url string, sessio
 		resp, err := c.client.Do(req)
 		if err != nil {
 			if !uploadOnly { // stream-down is enough
-				c.closed = true
+				c.closed.Store(true)
 				errors.LogInfoInner(ctx, err, "failed to "+method+" "+url)
 			}
 			gotConn.Close()
@@ -108,7 +109,7 @@ func (c *DefaultDialerClient) PostPacket(ctx context.Context, url string, sessio
 	if c.httpVersion != "1.1" {
 		resp, err := c.client.Do(req)
 		if err != nil {
-			c.closed = true
+			c.closed.Store(true)
 			return err
 		}
 
@@ -148,7 +149,7 @@ func (c *DefaultDialerClient) PostPacket(ctx context.Context, url string, sessio
 				if h1UploadConn.UnreadedResponsesCount > 0 {
 					resp, err := http.ReadResponse(h1UploadConn.RespBufReader, req)
 					if err != nil {
-						c.closed = true
+						c.closed.Store(true)
 						return fmt.Errorf("error while reading response: %s", err.Error())
 					}
 					io.Copy(io.Discard, resp.Body)

transport/internet/splithttp/config.go

@@ -1,6 +1,7 @@
 package splithttp
 
 import (
+	"bytes"
 	"encoding/base64"
 	"fmt"
 	"io"
@@ -330,14 +331,18 @@ func (c *Config) FillStreamRequest(request *http.Request, sessionId string, seqS
 func (c *Config) FillPacketRequest(request *http.Request, sessionId string, seqStr string, payload buf.MultiBuffer) error {
 	dataPlacement := c.GetNormalizedUplinkDataPlacement()
 
+	data := make([]byte, payload.Len())
+	payload.Copy(data)
+	buf.ReleaseMulti(payload)
+
 	if dataPlacement == PlacementBody || dataPlacement == PlacementAuto {
 		request.Header = c.GetRequestHeader()
-		request.Body = io.NopCloser(&buf.MultiBufferContainer{MultiBuffer: payload})
-		request.ContentLength = int64(payload.Len())
+		request.Body = io.NopCloser(bytes.NewReader(data))
+		request.ContentLength = int64(len(data))
+		request.GetBody = func() (io.ReadCloser, error) {
+			return io.NopCloser(bytes.NewReader(data)), nil
+		}
 	} else {
-		data := make([]byte, payload.Len())
-		payload.Copy(data)
-		buf.ReleaseMulti(payload)
 		switch dataPlacement {
 		case PlacementHeader:
 			request.Header = c.GetRequestHeaderWithPayload(data)

transport/internet/splithttp/config_test.go

@@ -1,9 +1,13 @@
 package splithttp_test
 
 import (
+	"io"
+	"net/http"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
 	. "github.com/xtls/xray-core/transport/internet/splithttp"
 )
 
@@ -77,3 +81,35 @@ func Test_GetNormalizedPath(t *testing.T) {
 		})
 	}
 }
+
+func Test_FillPacketRequest_GetBody(t *testing.T) {
+	data := []byte("hello xray")
+	payload := buf.MergeBytes(nil, data)
+
+	req, err := http.NewRequest("POST", "https://example.com/", nil)
+	common.Must(err)
+
+	config := &Config{}
+	config.FillPacketRequest(req, "sess", "0", payload)
+
+	if req.GetBody == nil {
+		t.Fatalf("Expected GetBody to be set")
+	}
+
+	first, err := io.ReadAll(req.Body)
+	common.Must(err)
+
+	if string(data) != string(first) {
+		t.Fatalf("Body mismatch. Format %q and %q are not equal", data, first)
+	}
+
+	body2, err := req.GetBody()
+	common.Must(err)
+
+	second, err := io.ReadAll(body2)
+	common.Must(err)
+
+	if string(data) != string(second) {
+		t.Fatalf("Replayed body mismatch. Format %q and %q are not equal", data, second)
+	}
+}

transport/internet/splithttp/dialer.go

@@ -175,6 +175,7 @@ func createHTTPClient(dest net.Destination, streamSettings *internet.MemoryStrea
 			KeepAlivePeriod:                time.Duration(quicParams.KeepAlivePeriod) * time.Second,
 			MaxIncomingStreams:             quicParams.MaxIncomingStreams,
 			DisablePathMTUDiscovery:        quicParams.DisablePathMtuDiscovery || (runtime.GOOS != "linux" && runtime.GOOS != "windows" && runtime.GOOS != "darwin"),
+			ChromeParrot:                   !quicParams.DisableChromeParrot,
 		}
 		if quicParams.MaxIdleTimeout == 0 {
 			quicConfig.MaxIdleTimeout = net.ConnIdleTimeout
@@ -255,18 +256,25 @@ func createHTTPClient(dest net.Destination, streamSettings *internet.MemoryStrea
 					pktConn = newConn
 				}
 
-				conn, err := quic.DialEarly(ctx, pktConn, udpAddr, tlsCfg, cfg)
+				tr := &quic.Transport{Conn: pktConn, DisableGSO: quicParams.DisableGSO}
+
+				if !quicParams.DisableChromeParrot {
+					tr.ConnectionIDGenerator = quic.ZeroLengthConnectionIDGenerator{}
+					tlsCfg.GetCertificate = nil
+				}
+
+				conn, err := tr.DialEarly(ctx, udpAddr, tlsCfg, cfg)
 				if err != nil {
 					return nil, err
 				}
-				context.AfterFunc(conn.Context(), func() { pktConn.Close() })
+				context.AfterFunc(conn.Context(), func() { tr.Close(); pktConn.Close() })
 
 				switch quicParams.Congestion {
 				case "reno":
 				case "", "bbr":
 					congestion.UseBBR(conn, bbr.Profile(quicParams.BbrProfile))
 				case "force-brutal":
-					congestion.UseBrutal(conn, quicParams.BrutalUp)
+					congestion.UseBrutal(conn, quicParams.BrutalUp, quicParams.BrutalDisableLossCompensation)
 				default:
 					panic(quicParams.Congestion)
 				}
@@ -595,11 +603,12 @@ func (w uploadWriter) Write(b []byte) (int, error) {
 
 	var writed int
 	for _, buff := range buffer.MultiBuffer {
+		n := int(buff.Len())
 		err := w.WriteMultiBuffer(buf.MultiBuffer{buff})
 		if err != nil {
 			return writed, err
 		}
-		writed += int(buff.Len())
+		writed += n
 	}
 	return writed, nil
 }

transport/internet/splithttp/hub.go

@@ -3,6 +3,7 @@ package splithttp
 import (
 	"bytes"
 	"context"
+	"crypto/rand"
 	gotls "crypto/tls"
 	"encoding/base64"
 	"fmt"
@@ -506,7 +507,15 @@ func ListenXH(ctx context.Context, address net.Address, port net.Port, streamSet
 			DisablePathMTUDiscovery:        quicParams.DisablePathMtuDiscovery || (runtime.GOOS != "linux" && runtime.GOOS != "windows" && runtime.GOOS != "darwin"),
 		}
 
-		l.h3listener, err = quic.ListenEarly(Conn, tlsConfig, quicConfig)
+		var k *quic.StatelessResetKey
+		if !quicParams.DisableStatelessReset {
+			k = &quic.StatelessResetKey{}
+			common.Must2(rand.Read((*k)[:]))
+		}
+
+		tr := &quic.Transport{Conn: Conn, DisableGSO: quicParams.DisableGSO, StatelessResetKey: k}
+
+		l.h3listener, err = tr.ListenEarly(tlsConfig, quicConfig)
 		if err != nil {
 			return nil, errors.New("failed to listen QUIC for XHTTP/3 on ", address, ":", port).Base(err)
 		}
@@ -525,6 +534,8 @@ func ListenXH(ctx context.Context, address net.Address, port net.Port, streamSet
 			if err := l.h3server.ServeListener(l.h3listener); err != nil {
 				errors.LogErrorInner(ctx, err, "failed to serve HTTP/3 for XHTTP/3")
 			}
+			_ = tr.Close()
+			_ = Conn.Close()
 		}()
 	} else { // tcp
 		l.listener, err = internet.ListenSystem(ctx, &net.TCPAddr{
@@ -622,7 +633,7 @@ func (l *QListener) Accept(ctx context.Context) (*quic.Conn, error) {
 	case "", "bbr":
 		congestion.UseBBR(conn, bbr.Profile(l.quicParams.BbrProfile))
 	case "force-brutal":
-		congestion.UseBrutal(conn, l.quicParams.BrutalUp)
+		congestion.UseBrutal(conn, l.quicParams.BrutalUp, l.quicParams.BrutalDisableLossCompensation)
 	default:
 		panic(l.quicParams.Congestion)
 	}

transport/internet/system_dialer.go

@@ -50,18 +50,24 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 	errors.LogDebug(ctx, "dialing to "+dest.String())
 
 	if dest.Network == net.Network_UDP {
-		srcAddr := resolveSrcAddr(net.Network_UDP, src)
-		if srcAddr == nil {
-			srcAddr = &net.UDPAddr{
-				IP:   []byte{0, 0, 0, 0},
-				Port: 0,
-			}
-		}
-		var lc net.ListenConfig
 		destAddr, err := net.ResolveUDPAddr("udp", dest.NetAddr())
 		if err != nil {
 			return nil, err
 		}
+		srcAddr := resolveSrcAddr(net.Network_UDP, src)
+		if srcAddr == nil {
+			// some OS don't support mapped IPv4 dual stack
+			// and need to select 0.0.0.0 or [::] manually based on the destination
+			wildcard := net.AnyIP.IP()
+			if destAddr.IP.To4() == nil {
+				wildcard = net.AnyIPv6.IP()
+			}
+			srcAddr = &net.UDPAddr{
+				IP:   wildcard,
+				Port: 0,
+			}
+		}
+		var lc net.ListenConfig
 		lc.Control = func(network, address string, c syscall.RawConn) error {
 			for _, ctl := range Controllers {
 				if err := ctl(network, address, c); err != nil {

transport/internet/tcp/hub.go

@@ -42,9 +42,6 @@ func ListenTCP(ctx context.Context, address net.Address, port net.Port, streamSe
 	var listener net.Listener
 	var err error
 	if port == net.Port(0) { // unix
-		if !address.Family().IsDomain() {
-			return nil, errors.New("invalid unix listen: ", address).AtError()
-		}
 		listener, err = internet.ListenSystem(ctx, &net.UnixAddr{
 			Name: address.Domain(),
 			Net:  "unix",

transport/internet/tcp_hub.go

@@ -65,6 +65,9 @@ func ListenTCP(ctx context.Context, address net.Address, port net.Port, settings
 	if address.Family().IsDomain() {
 		return nil, errors.New("domain address is not allowed for listening: ", address.Domain())
 	}
+	if port == 0 {
+		return nil, errors.New("port 0 is not allowed for listening on TCP")
+	}
 
 	protocol := settings.ProtocolName
 	listenFunc := transportListenerCache[protocol]

transport/internet/udp/hub_openbsd.go

@@ -0,0 +1,73 @@
+//go:build openbsd
+// +build openbsd
+
+package udp
+
+import (
+	"encoding/binary"
+
+	"github.com/xtls/xray-core/common/net"
+	"golang.org/x/sys/unix"
+)
+
+func retrieveOriginalDestFromControlMessages(msgs []unix.SocketControlMessage) net.Destination {
+	var ip []byte
+	var port uint16
+	var haveAddress bool
+	var havePort bool
+
+	for _, msg := range msgs {
+		switch msg.Header.Level {
+		case unix.IPPROTO_IP:
+			switch msg.Header.Type {
+			case unix.IP_RECVDSTADDR:
+				if len(msg.Data) < 4 {
+					continue
+				}
+				ip = append(ip[:0], msg.Data[:4]...)
+				haveAddress = true
+			case unix.IP_RECVDSTPORT:
+				if len(msg.Data) < 2 {
+					continue
+				}
+				port = binary.BigEndian.Uint16(msg.Data[:2])
+				havePort = true
+			}
+		case unix.IPPROTO_IPV6:
+			switch msg.Header.Type {
+			case unix.IPV6_PKTINFO:
+				// struct in6_pktinfo: the destination address is followed by
+				// the interface index.
+				if len(msg.Data) < 16 {
+					continue
+				}
+				ip = append(ip[:0], msg.Data[:16]...)
+				haveAddress = true
+			case unix.IPV6_RECVDSTPORT:
+				if len(msg.Data) < 2 {
+					continue
+				}
+				port = binary.BigEndian.Uint16(msg.Data[:2])
+				havePort = true
+			}
+		}
+	}
+
+	if !haveAddress || !havePort || port == 0 {
+		return net.Destination{}
+	}
+
+	return net.UDPDestination(net.IPAddress(ip), net.Port(port))
+}
+
+func RetrieveOriginalDest(oob []byte) net.Destination {
+	msgs, err := unix.ParseSocketControlMessage(oob)
+	if err != nil {
+		return net.Destination{}
+	}
+	return retrieveOriginalDestFromControlMessages(msgs)
+}
+
+func ReadUDPMsg(conn *net.UDPConn, payload []byte, oob []byte) (int, int, int, *net.UDPAddr, error) {
+	return conn.ReadMsgUDP(payload, oob)
+}

transport/internet/udp/hub_openbsd_test.go

@@ -0,0 +1,99 @@
+//go:build openbsd
+// +build openbsd
+
+package udp
+
+import (
+	"testing"
+
+	"golang.org/x/sys/unix"
+)
+
+func TestRetrieveOriginalDestFromControlMessages(t *testing.T) {
+	msgs := []unix.SocketControlMessage{
+		{
+			Header: unix.Cmsghdr{Level: unix.IPPROTO_IP, Type: unix.IP_RECVDSTPORT},
+			Data:   []byte{0x30, 0x39},
+		},
+		{
+			Header: unix.Cmsghdr{Level: unix.IPPROTO_IP, Type: unix.IP_RECVDSTADDR},
+			Data:   []byte{203, 0, 113, 7},
+		},
+	}
+
+	dest := retrieveOriginalDestFromControlMessages(msgs)
+	if !dest.IsValid() {
+		t.Fatal("destination is invalid")
+	}
+	if got, want := dest.Address.String(), "203.0.113.7"; got != want {
+		t.Fatalf("address = %q, want %q", got, want)
+	}
+	if got, want := dest.Port.Value(), uint16(12345); got != want {
+		t.Fatalf("port = %d, want %d", got, want)
+	}
+}
+
+func TestRetrieveOriginalDestFromControlMessagesIPv6(t *testing.T) {
+	// 2001:db8::7 followed by the interface index, as in struct in6_pktinfo.
+	pktinfo := []byte{
+		0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0,
+		0, 0, 0, 0, 0, 0, 0, 0x07,
+		0x02, 0, 0, 0,
+	}
+	msgs := []unix.SocketControlMessage{
+		{
+			Header: unix.Cmsghdr{Level: unix.IPPROTO_IPV6, Type: unix.IPV6_RECVDSTPORT},
+			Data:   []byte{0x30, 0x39},
+		},
+		{
+			Header: unix.Cmsghdr{Level: unix.IPPROTO_IPV6, Type: unix.IPV6_PKTINFO},
+			Data:   pktinfo,
+		},
+	}
+
+	dest := retrieveOriginalDestFromControlMessages(msgs)
+	if !dest.IsValid() {
+		t.Fatal("destination is invalid")
+	}
+	if got, want := dest.Address.IP().String(), "2001:db8::7"; got != want {
+		t.Fatalf("address = %q, want %q", got, want)
+	}
+	if got, want := dest.Port.Value(), uint16(12345); got != want {
+		t.Fatalf("port = %d, want %d", got, want)
+	}
+}
+
+func TestRetrieveOriginalDestRequiresAddressAndPort(t *testing.T) {
+	tests := [][]unix.SocketControlMessage{
+		{
+			{
+				Header: unix.Cmsghdr{Level: unix.IPPROTO_IP, Type: unix.IP_RECVDSTADDR},
+				Data:   []byte{203, 0, 113, 7},
+			},
+		},
+		{
+			{
+				Header: unix.Cmsghdr{Level: unix.IPPROTO_IP, Type: unix.IP_RECVDSTPORT},
+				Data:   []byte{0x30, 0x39},
+			},
+		},
+		{
+			{
+				Header: unix.Cmsghdr{Level: unix.IPPROTO_IPV6, Type: unix.IPV6_PKTINFO},
+				Data:   make([]byte, 20),
+			},
+		},
+		{
+			{
+				Header: unix.Cmsghdr{Level: unix.IPPROTO_IPV6, Type: unix.IPV6_RECVDSTPORT},
+				Data:   []byte{0x30, 0x39},
+			},
+		},
+	}
+
+	for _, msgs := range tests {
+		if dest := retrieveOriginalDestFromControlMessages(msgs); dest.IsValid() {
+			t.Fatalf("unexpected destination: %v", dest)
+		}
+	}
+}

transport/internet/udp/hub_other.go

@@ -1,5 +1,5 @@
-//go:build !linux && !freebsd && !darwin
-// +build !linux,!freebsd,!darwin
+//go:build !linux && !freebsd && !darwin && !openbsd
+// +build !linux,!freebsd,!darwin,!openbsd
 
 package udp