Fixes #15924: Fix API interface patch tagged all mode (#18759)

* Fixes: #15924 - Prevent API payload from allowing tagged_vlans while interface mode is set to taged-all

* Prevent cleanup of tagged_vlans when no tagged_vlans set on interface

* Fix test errors

* Remove accidental debug statements

* Update validation to model clean method instead of serializer

* Remove clearing of tagged vlans from `save()`

* Make changes to validation to account for M2M not being available under model in addition to not being able to check incoming vlans under same model.

* Optimize untagged vlan check

* Re-ordering statements in validators

* Forgot to call super().clean()

* Adjust logic for form and serializer.  Add tests

* Fix test failure

* Fix ruff errors

* Fix test by removing now invalid test

* Update serializer, form and tests

* Optimize API test for vlan fields

* Optimize API serializer logic

---------

Co-authored-by: Daniel Sheppard <dans@dansheps.com>

netbox/dcim/api/serializers_/device_components.py

@@ -1,3 +1,4 @@
+from django.utils.translation import gettext as _
 from django.contrib.contenttypes.models import ContentType
 from drf_spectacular.utils import extend_schema_field
 from rest_framework import serializers
@@ -232,8 +233,56 @@ class InterfaceSerializer(NetBoxModelSerializer, CabledObjectSerializer, Connect
 
     def validate(self, data):
 
-        # Validate many-to-many VLAN assignments
         if not self.nested:
+
+            # Validate 802.1q mode and vlan(s)
+            mode = None
+            tagged_vlans = []
+
+            # Gather Information
+            if self.instance:
+                mode = data.get('mode') if 'mode' in data.keys() else self.instance.mode
+                untagged_vlan = data.get('untagged_vlan') if 'untagged_vlan' in data.keys() else \
+                    self.instance.untagged_vlan
+                qinq_svlan = data.get('qinq_svlan') if 'qinq_svlan' in data.keys() else \
+                    self.instance.qinq_svlan
+                tagged_vlans = data.get('tagged_vlans') if 'tagged_vlans' in data.keys() else \
+                    self.instance.tagged_vlans.all()
+            else:
+                mode = data.get('mode', None)
+                untagged_vlan = data.get('untagged_vlan') if 'untagged_vlan' in data.keys() else None
+                qinq_svlan = data.get('qinq_svlan') if 'qinq_svlan' in data.keys() else None
+                tagged_vlans = data.get('tagged_vlans') if 'tagged_vlans' in data.keys() else None
+
+            errors = {}
+
+            # Non Q-in-Q mode with service vlan set
+            if mode != InterfaceModeChoices.MODE_Q_IN_Q and qinq_svlan:
+                errors.update({
+                    'qinq_svlan': _("Interface mode does not support q-in-q service vlan")
+                })
+            # Routed mode
+            if not mode:
+                # Untagged vlan
+                if untagged_vlan:
+                    errors.update({
+                        'untagged_vlan': _("Interface mode does not support untagged vlan")
+                    })
+                # Tagged vlan
+                if tagged_vlans:
+                    errors.update({
+                        'tagged_vlans': _("Interface mode does not support tagged vlans")
+                    })
+            # Non-tagged mode
+            elif mode in (InterfaceModeChoices.MODE_TAGGED_ALL, InterfaceModeChoices.MODE_ACCESS) and tagged_vlans:
+                errors.update({
+                    'tagged_vlans': _("Interface mode does not support tagged vlans")
+                })
+
+            if errors:
+                raise serializers.ValidationError(errors)
+
+            # Validate many-to-many VLAN assignments
             device = self.instance.device if self.instance else data.get('device')
             for vlan in data.get('tagged_vlans', []):
                 if vlan.site not in [device.site, None]:

netbox/dcim/forms/common.py

@@ -43,20 +43,14 @@ class InterfaceCommonForm(forms.Form):
         super().clean()
 
         parent_field = 'device' if 'device' in self.cleaned_data else 'virtual_machine'
-        tagged_vlans = self.cleaned_data.get('tagged_vlans')
+        if 'tagged_vlans' in self.fields.keys():
-
+            tagged_vlans = self.cleaned_data.get('tagged_vlans') if self.is_bound else \
-        # Untagged interfaces cannot be assigned tagged VLANs
+                self.get_initial_for_field(self.fields['tagged_vlans'], 'tagged_vlans')
-        if self.cleaned_data['mode'] == InterfaceModeChoices.MODE_ACCESS and tagged_vlans:
+        else:
-            raise forms.ValidationError({
+            tagged_vlans = []
-                'mode': _("An access interface cannot have tagged VLANs assigned.")
-            })
-
-        # Remove all tagged VLAN assignments from "tagged all" interfaces
-        elif self.cleaned_data['mode'] == InterfaceModeChoices.MODE_TAGGED_ALL:
-            self.cleaned_data['tagged_vlans'] = []
 
         # Validate tagged VLANs; must be a global VLAN or in the same site
-        elif self.cleaned_data['mode'] == InterfaceModeChoices.MODE_TAGGED and tagged_vlans:
+        if self.cleaned_data['mode'] == InterfaceModeChoices.MODE_TAGGED and tagged_vlans:
             valid_sites = [None, self.cleaned_data[parent_field].site]
             invalid_vlans = [str(v) for v in tagged_vlans if v.site not in valid_sites]
 

netbox/dcim/models/device_components.py

@@ -934,6 +934,8 @@ class Interface(ModularComponentModel, BaseInterface, CabledObjectModel, PathEnd
                 raise ValidationError({'rf_channel_width': _("Cannot specify custom width with channel selected.")})
 
         # VLAN validation
+        if not self.mode and self.untagged_vlan:
+            raise ValidationError({'untagged_vlan': _("Interface mode does not support an untagged vlan.")})
 
         # Validate untagged VLAN
         if self.untagged_vlan and self.untagged_vlan.site not in [self.device.site, None]:

netbox/dcim/tests/test_api.py

@@ -1,3 +1,5 @@
+import json
+
 from django.test import override_settings
 from django.urls import reverse
 from django.utils.translation import gettext as _
@@ -1748,6 +1750,23 @@ class InterfaceTest(Mixins.ComponentTraceMixin, APIViewTestCases.APIViewTestCase
             },
         ]
 
+    def _perform_interface_test_with_invalid_data(self, mode: str = None, invalid_data: dict = {}):
+        device = Device.objects.first()
+        data = {
+            'device': device.pk,
+            'name': 'Interface 1',
+            'type': InterfaceTypeChoices.TYPE_1GE_FIXED,
+        }
+        data.update({'mode': mode})
+        data.update(invalid_data)
+
+        response = self.client.post(self._get_list_url(), data, format='json', **self.header)
+        self.assertHttpStatus(response, status.HTTP_400_BAD_REQUEST)
+        content = json.loads(response.content)
+        for key in invalid_data.keys():
+            self.assertIn(key, content)
+        self.assertIsNone(content.get('data'))
+
     def test_bulk_delete_child_interfaces(self):
         interface1 = Interface.objects.get(name='Interface 1')
         device = interface1.device
@@ -1775,6 +1794,57 @@ class InterfaceTest(Mixins.ComponentTraceMixin, APIViewTestCases.APIViewTestCase
         self.client.delete(self._get_list_url(), data, format='json', **self.header)
         self.assertEqual(device.interfaces.count(), 2)  # Child & parent were both deleted
 
+    def test_create_child_interfaces_mode_invalid_data(self):
+        """
+        POST data to test interface mode check and invalid tagged/untagged VLANS.
+        """
+        self.add_permissions('dcim.add_interface')
+
+        vlans = VLAN.objects.all()[0:3]
+
+        # Routed mode, untagged, tagged and qinq service vlan
+        invalid_data = {
+            'untagged_vlan': vlans[0].pk,
+            'tagged_vlans': [vlans[1].pk, vlans[2].pk],
+            'qinq_svlan': vlans[2].pk
+        }
+        self._perform_interface_test_with_invalid_data(None, invalid_data)
+
+        # Routed mode, untagged and tagged vlan
+        invalid_data = {
+            'untagged_vlan': vlans[0].pk,
+            'tagged_vlans': [vlans[1].pk, vlans[2].pk],
+        }
+        self._perform_interface_test_with_invalid_data(None, invalid_data)
+
+        # Routed mode, untagged vlan
+        invalid_data = {
+            'untagged_vlan': vlans[0].pk,
+        }
+        self._perform_interface_test_with_invalid_data(None, invalid_data)
+
+        invalid_data = {
+            'tagged_vlans': [vlans[1].pk, vlans[2].pk],
+        }
+        # Routed mode, qinq service vlan
+        self._perform_interface_test_with_invalid_data(None, invalid_data)
+        # Access mode, tagged vlans
+        self._perform_interface_test_with_invalid_data(InterfaceModeChoices.MODE_ACCESS, invalid_data)
+        # All tagged mode, tagged vlans
+        self._perform_interface_test_with_invalid_data(InterfaceModeChoices.MODE_TAGGED_ALL, invalid_data)
+
+        invalid_data = {
+            'qinq_svlan': vlans[0].pk,
+        }
+        # Routed mode, qinq service vlan
+        self._perform_interface_test_with_invalid_data(None, invalid_data)
+        # Access mode, qinq service vlan
+        self._perform_interface_test_with_invalid_data(InterfaceModeChoices.MODE_ACCESS, invalid_data)
+        # Tagged mode, qinq service vlan
+        self._perform_interface_test_with_invalid_data(InterfaceModeChoices.MODE_TAGGED, invalid_data)
+        # Tagged-all mode, qinq service vlan
+        self._perform_interface_test_with_invalid_data(InterfaceModeChoices.MODE_TAGGED_ALL, invalid_data)
+
 
 class FrontPortTest(APIViewTestCases.APIViewTestCase):
     model = FrontPort

netbox/dcim/tests/test_forms.py

@@ -1,8 +1,9 @@
 from django.test import TestCase
 
-from dcim.choices import DeviceFaceChoices, DeviceStatusChoices, InterfaceTypeChoices
+from dcim.choices import DeviceFaceChoices, DeviceStatusChoices, InterfaceTypeChoices, InterfaceModeChoices
 from dcim.forms import *
 from dcim.models import *
+from ipam.models import VLAN
 from utilities.testing import create_test_device
 from virtualization.models import Cluster, ClusterGroup, ClusterType
 
@@ -117,11 +118,23 @@ class DeviceTestCase(TestCase):
         self.assertIn('position', form.errors)
 
 
-class LabelTestCase(TestCase):
+class InterfaceTestCase(TestCase):
 
     @classmethod
     def setUpTestData(cls):
         cls.device = create_test_device('Device 1')
+        cls.vlans = (
+            VLAN(name='VLAN 1', vid=1),
+            VLAN(name='VLAN 2', vid=2),
+            VLAN(name='VLAN 3', vid=3),
+        )
+        VLAN.objects.bulk_create(cls.vlans)
+        cls.interface = Interface.objects.create(
+            device=cls.device,
+            name='Interface 1',
+            type=InterfaceTypeChoices.TYPE_1GE_GBIC,
+            mode=InterfaceModeChoices.MODE_TAGGED,
+        )
 
     def test_interface_label_count_valid(self):
         """
@@ -151,3 +164,152 @@ class LabelTestCase(TestCase):
 
         self.assertFalse(form.is_valid())
         self.assertIn('label', form.errors)
+
+    def test_create_interface_mode_valid_data(self):
+        """
+        Test that saving valid interface mode and tagged/untagged vlans works properly
+        """
+
+        # Validate access mode
+        data = {
+            'device': self.device.pk,
+            'name': 'ethernet1/1',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': InterfaceModeChoices.MODE_ACCESS,
+            'untagged_vlan': self.vlans[0].pk
+        }
+        form = InterfaceCreateForm(data)
+
+        self.assertTrue(form.is_valid())
+
+        # Validate tagged vlans
+        data = {
+            'device': self.device.pk,
+            'name': 'ethernet1/2',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': InterfaceModeChoices.MODE_TAGGED,
+            'untagged_vlan': self.vlans[0].pk,
+            'tagged_vlans': [self.vlans[1].pk, self.vlans[2].pk]
+        }
+        form = InterfaceCreateForm(data)
+        self.assertTrue(form.is_valid())
+
+        # Validate tagged vlans
+        data = {
+            'device': self.device.pk,
+            'name': 'ethernet1/3',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': InterfaceModeChoices.MODE_TAGGED_ALL,
+            'untagged_vlan': self.vlans[0].pk,
+        }
+        form = InterfaceCreateForm(data)
+        self.assertTrue(form.is_valid())
+
+    def test_create_interface_mode_access_invalid_data(self):
+        """
+        Test that saving invalid interface mode and tagged/untagged vlans works properly
+        """
+        data = {
+            'device': self.device.pk,
+            'name': 'ethernet1/4',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': InterfaceModeChoices.MODE_ACCESS,
+            'untagged_vlan': self.vlans[0].pk,
+            'tagged_vlans': [self.vlans[1].pk, self.vlans[2].pk]
+        }
+        form = InterfaceCreateForm(data)
+
+        self.assertTrue(form.is_valid())
+        self.assertIn('untagged_vlan', form.cleaned_data.keys())
+        self.assertNotIn('tagged_vlans', form.cleaned_data.keys())
+        self.assertNotIn('qinq_svlan', form.cleaned_data.keys())
+
+    def test_edit_interface_mode_access_invalid_data(self):
+        """
+        Test that saving invalid interface mode and tagged/untagged vlans works properly
+        """
+        data = {
+            'device': self.device.pk,
+            'name': 'Ethernet 1/5',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': InterfaceModeChoices.MODE_ACCESS,
+            'tagged_vlans': [self.vlans[0].pk, self.vlans[1].pk, self.vlans[2].pk]
+        }
+        form = InterfaceForm(data, instance=self.interface)
+
+        self.assertTrue(form.is_valid())
+        self.assertIn('untagged_vlan', form.cleaned_data.keys())
+        self.assertNotIn('tagged_vlans', form.cleaned_data.keys())
+        self.assertNotIn('qinq_svlan', form.cleaned_data.keys())
+
+    def test_create_interface_mode_tagged_all_invalid_data(self):
+        """
+        Test that saving invalid interface mode and tagged/untagged vlans works properly
+        """
+        data = {
+            'device': self.device.pk,
+            'name': 'ethernet1/6',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': InterfaceModeChoices.MODE_TAGGED_ALL,
+            'tagged_vlans': [self.vlans[0].pk, self.vlans[1].pk, self.vlans[2].pk]
+        }
+        form = InterfaceCreateForm(data)
+
+        self.assertTrue(form.is_valid())
+        self.assertIn('untagged_vlan', form.cleaned_data.keys())
+        self.assertNotIn('tagged_vlans', form.cleaned_data.keys())
+        self.assertNotIn('qinq_svlan', form.cleaned_data.keys())
+
+    def test_edit_interface_mode_tagged_all_invalid_data(self):
+        """
+        Test that saving invalid interface mode and tagged/untagged vlans works properly
+        """
+        data = {
+            'device': self.device.pk,
+            'name': 'Ethernet 1/7',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': InterfaceModeChoices.MODE_TAGGED_ALL,
+            'tagged_vlans': [self.vlans[0].pk, self.vlans[1].pk, self.vlans[2].pk]
+        }
+        form = InterfaceForm(data)
+        self.assertTrue(form.is_valid())
+        self.assertIn('untagged_vlan', form.cleaned_data.keys())
+        self.assertNotIn('tagged_vlans', form.cleaned_data.keys())
+        self.assertNotIn('qinq_svlan', form.cleaned_data.keys())
+
+    def test_create_interface_mode_routed_invalid_data(self):
+        """
+        Test that saving invalid interface mode (routed) and tagged/untagged vlans works properly
+        """
+        data = {
+            'device': self.device.pk,
+            'name': 'ethernet1/6',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': None,
+            'untagged_vlan': self.vlans[0].pk,
+            'tagged_vlans': [self.vlans[0].pk, self.vlans[1].pk, self.vlans[2].pk]
+        }
+        form = InterfaceCreateForm(data)
+
+        self.assertTrue(form.is_valid())
+        self.assertNotIn('untagged_vlan', form.cleaned_data.keys())
+        self.assertNotIn('tagged_vlans', form.cleaned_data.keys())
+        self.assertNotIn('qinq_svlan', form.cleaned_data.keys())
+
+    def test_edit_interface_mode_routed_invalid_data(self):
+        """
+        Test that saving invalid interface mode (routed) and tagged/untagged vlans works properly
+        """
+        data = {
+            'device': self.device.pk,
+            'name': 'Ethernet 1/7',
+            'type': InterfaceTypeChoices.TYPE_1GE_GBIC,
+            'mode': None,
+            'untagged_vlan': self.vlans[0].pk,
+            'tagged_vlans': [self.vlans[0].pk, self.vlans[1].pk, self.vlans[2].pk]
+        }
+        form = InterfaceForm(data)
+        self.assertTrue(form.is_valid())
+        self.assertNotIn('untagged_vlan', form.cleaned_data.keys())
+        self.assertNotIn('tagged_vlans', form.cleaned_data.keys())
+        self.assertNotIn('qinq_svlan', form.cleaned_data.keys())