add PCNT and PAD

Signed-off-by: Florian Lehner <dev@der-flo.net>

f_basic.go

@@ -13,6 +13,7 @@ const (
 	tcaBasicAct
 	tcaBasicPolice
 	tcaBasicPCNT
+	tcaBasicPad
 )
 
 // Basic contains attributes of the basic discipline
@@ -21,6 +22,7 @@ type Basic struct {
 	Police  *Police
 	Ematch  *Ematch
 	Actions *[]*Action
+	Pcnt    *uint64
 }
 
 // unmarshalBasic parses the Basic-encoded data and stores the result in the value pointed to by info.
@@ -50,7 +52,9 @@ func unmarshalBasic(data []byte, info *Basic) error {
 			multiError = concatError(multiError, err)
 			info.Actions = actions
 		case tcaBasicPCNT:
-			continue
+			info.Pcnt = uint64Ptr(ad.Uint64())
+		case tcaBasicPad:
+			// padding does not contain data, we just skip it
 		default:
 			return fmt.Errorf("unmarshalBasic()\t%d\n\t%v", ad.Type(), ad.Bytes())
 		}
@@ -65,6 +69,9 @@ func marshalBasic(info *Basic) ([]byte, error) {
 	if info == nil {
 		return []byte{}, fmt.Errorf("Basic: %w", ErrNoArg)
 	}
+	if info.Pcnt != nil {
+		return []byte{}, ErrNoArgAlter
+	}
 	var multiError error
 
 	// TODO: improve logic and check combinations

f_basic_test.go

@@ -53,7 +53,7 @@ func TestBasic(t *testing.T) {
 				}
 				t.Fatalf("Unexpected error: %v", err1)
 			}
-			newData := injectAttribute(t, data, []byte{}, tcaBasicPCNT)
+			newData := injectAttribute(t, data, []byte{}, tcaBasicPad)
 			val := Basic{}
 			err2 := unmarshalBasic(newData, &val)
 			if err2 != nil {
@@ -80,4 +80,10 @@ func TestBasic(t *testing.T) {
 			t.Fatalf("expected error but got nil")
 		}
 	})
+	t.Run("pcnt", func(t *testing.T) {
+		_, err := marshalBasic(&Basic{Pcnt: uint64Ptr(42)})
+		if !errors.Is(err, ErrNoArgAlter) {
+			t.Fatalf("expected '%v' but got '%v'", ErrNoArgAlter, err)
+		}
+	})
 }