XUDP protocol: Add Global ID & UoT Migration

The first UoT protocol that supports UoT Migration
Thank @yuhan6665 for testing

common/session/context.go

@@ -2,10 +2,14 @@ package session
 
 import (
 	"context"
+	_ "unsafe"
 
 	"github.com/xtls/xray-core/features/routing"
 )
 
+//go:linkname IndependentCancelCtx context.newCancelCtx
+func IndependentCancelCtx(parent context.Context) context.Context
+
 type sessionKey int
 
 const (
@@ -17,6 +21,7 @@ const (
 	sockoptSessionKey
 	trackedConnectionErrorKey
 	dispatcherKey
+	timeoutOnlyKey
 )
 
 // ContextWithID returns a new context with the given ID.
@@ -131,3 +136,14 @@ func DispatcherFromContext(ctx context.Context) routing.Dispatcher {
 	}
 	return nil
 }
+
+func ContextWithTimeoutOnly(ctx context.Context, only bool) context.Context {
+	return context.WithValue(ctx, timeoutOnlyKey, only)
+}
+
+func TimeoutOnlyFromContext(ctx context.Context) bool {
+	if val, ok := ctx.Value(timeoutOnlyKey).(bool); ok {
+		return val
+	}
+	return false
+}

common/session/session.go

@@ -42,6 +42,8 @@ type Inbound struct {
 	Gateway net.Destination
 	// Tag of the inbound proxy that handles the connection.
 	Tag string
+	// Name of the inbound proxy that handles the connection.
+	Name string
 	// User is the user that authencates for the inbound. May be nil if the protocol allows anounymous traffic.
 	User *protocol.MemoryUser
 	// Conn is actually internet.Connection. May be nil.