[skip ci][内容]

1.修复部分空指针问题
2.修改go.mod

rule/common/network_type.go

@@ -13,20 +13,22 @@ type NetworkType struct {
 }
 
 func NewNetworkType(network, adapter string) (*NetworkType, error) {
-	ntType := new(NetworkType)
-	ntType.adapter = adapter
+	var netType C.NetWork
 	switch strings.ToUpper(network) {
 	case "TCP":
-		ntType.network = C.TCP
+		netType = C.TCP
 		break
 	case "UDP":
-		ntType.network = C.UDP
+		netType = C.UDP
 		break
 	default:
 		return nil, fmt.Errorf("unsupported network type, only TCP/UDP")
 	}
-
-	return ntType, nil
+	return &NetworkType{
+		Base:    &Base{},
+		network: netType,
+		adapter: adapter,
+	}, nil
 }
 
 func (n *NetworkType) RuleType() C.RuleType {