Proxy: Add Hysteria outbound & transport (version 2, udphop) and Salamander udpmask (#5508)

https://github.com/XTLS/Xray-core/issues/3547#issuecomment-3549896520
https://github.com/XTLS/Xray-core/issues/2635#issuecomment-3570871754

transport/internet/memory_settings.go

@@ -1,6 +1,9 @@
 package internet
 
-import "github.com/xtls/xray-core/common/net"
+import (
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/transport/internet/finalmask"
+)
 
 // MemoryStreamConfig is a parsed form of StreamConfig. It is used to reduce the number of Protobuf parses.
 type MemoryStreamConfig struct {
@@ -9,6 +12,8 @@ type MemoryStreamConfig struct {
 	ProtocolSettings interface{}
 	SecurityType     string
 	SecuritySettings interface{}
+	TcpmaskManager   *finalmask.TcpmaskManager
+	UdpmaskManager   *finalmask.UdpmaskManager
 	SocketSettings   *SocketConfig
 	DownloadSettings *MemoryStreamConfig
 }
@@ -45,5 +50,29 @@ func ToMemoryStreamConfig(s *StreamConfig) (*MemoryStreamConfig, error) {
 		mss.SecuritySettings = ess
 	}
 
+	if s != nil && len(s.Tcpmasks) > 0 {
+		var masks []finalmask.Tcpmask
+		for _, msg := range s.Tcpmasks {
+			instance, err := msg.GetInstance()
+			if err != nil {
+				return nil, err
+			}
+			masks = append(masks, instance.(finalmask.Tcpmask))
+		}
+		mss.TcpmaskManager = finalmask.NewTcpmaskManager(masks)
+	}
+
+	if s != nil && len(s.Udpmasks) > 0 {
+		var masks []finalmask.Udpmask
+		for _, msg := range s.Udpmasks {
+			instance, err := msg.GetInstance()
+			if err != nil {
+				return nil, err
+			}
+			masks = append(masks, instance.(finalmask.Udpmask))
+		}
+		mss.UdpmaskManager = finalmask.NewUdpmaskManager(masks)
+	}
+
 	return mss, nil
 }