IPN: Update ServeConfig to accept configuration for Services.

This commit updates ServeConfig to allow configuration to Services (VIPServices for now) via Serve.
The scope of this commit is only adding the Services field to ServeConfig. The field doesn't actually
allow packet flowing yet. The purpose of this commit is to unblock other work on k8s end.

Updates #22953

Signed-off-by: KevinLiang10 <37811973+KevinLiang10@users.noreply.github.com>

ipn/ipn_clone.go

@@ -105,6 +105,16 @@ func (src *ServeConfig) Clone() *ServeConfig {
 			}
 		}
 	}
+	if dst.Services != nil {
+		dst.Services = map[string]*ServiceConfig{}
+		for k, v := range src.Services {
+			if v == nil {
+				dst.Services[k] = nil
+			} else {
+				dst.Services[k] = v.Clone()
+			}
+		}
+	}
 	dst.AllowFunnel = maps.Clone(src.AllowFunnel)
 	if dst.Foreground != nil {
 		dst.Foreground = map[string]*ServeConfig{}
@@ -123,11 +133,50 @@ func (src *ServeConfig) Clone() *ServeConfig {
 var _ServeConfigCloneNeedsRegeneration = ServeConfig(struct {
 	TCP         map[uint16]*TCPPortHandler
 	Web         map[HostPort]*WebServerConfig
+	Services    map[string]*ServiceConfig
 	AllowFunnel map[HostPort]bool
 	Foreground  map[string]*ServeConfig
 	ETag        string
 }{})
 
+// Clone makes a deep copy of ServiceConfig.
+// The result aliases no memory with the original.
+func (src *ServiceConfig) Clone() *ServiceConfig {
+	if src == nil {
+		return nil
+	}
+	dst := new(ServiceConfig)
+	*dst = *src
+	if dst.TCP != nil {
+		dst.TCP = map[uint16]*TCPPortHandler{}
+		for k, v := range src.TCP {
+			if v == nil {
+				dst.TCP[k] = nil
+			} else {
+				dst.TCP[k] = ptr.To(*v)
+			}
+		}
+	}
+	if dst.Web != nil {
+		dst.Web = map[HostPort]*WebServerConfig{}
+		for k, v := range src.Web {
+			if v == nil {
+				dst.Web[k] = nil
+			} else {
+				dst.Web[k] = v.Clone()
+			}
+		}
+	}
+	return dst
+}
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _ServiceConfigCloneNeedsRegeneration = ServiceConfig(struct {
+	TCP map[uint16]*TCPPortHandler
+	Web map[HostPort]*WebServerConfig
+	Tun bool
+}{})
+
 // Clone makes a deep copy of TCPPortHandler.
 // The result aliases no memory with the original.
 func (src *TCPPortHandler) Clone() *TCPPortHandler {