bridge: T3137: Let VLAN aware bridge approach the behavior of professional equipment

According to the consensus, the specific behavior of a VLAN aware bridge should conform
to the behavior of professional equipment. This commit makes a significant change to the
behavior of VLAN aware bridge, and has the following behaviors:

1. Disable `vif 1` configuration
2. When the VLAN aware bridge is enabled, the parent interface is always VLAN 1
3. When `native-vlan` is not configured, the default behavior of the device is `native-vlan 1`
4. The VLAN ids forwarded by the bridge are determined by `vif`
5. It has an `enable-vlan` node to enable VLAN awareness
6. VLAN configuration is allowed only when VLAN aware bridge is activated

1 files changed, 39 insertions, 63 deletions

diff --git a/python/vyos/ifconfig/bridge.py b/python/vyos/ifconfig/bridge.py
index 76520f2ba..87af0c9df 100644
--- a/python/vyos/ifconfig/bridge.py
+++ b/python/vyos/ifconfig/bridge.py
@@ -274,20 +274,31 @@ class BridgeIf(Interface):
         for member in (tmp or []):
             if member in interfaces():
                 self.del_port(member)
-        vlan_filter = 0
 
-        vlan_del = set()
-        vlan_add = set()
+        # enable/disable Vlan Filter
+        vlan_filter = 1 if 'enable_vlan' in config else 0
+        self.set_vlan_filter(str(vlan_filter))
+
+        if vlan_filter:
+            del_ifname_vlan_ids = get_vlan_ids(ifname)
+            # Delete all VLAN IDS configured in the interface first
+            for vlan in del_ifname_vlan_ids:
+                cmd = f'bridge vlan del dev {ifname} vid {vlan} self'
+                self._cmd(cmd)
+                
+            tmp = dict_search('vif', config)
+            if tmp:
+                for vif, vif_config in tmp.items():
+                    cmd = f'bridge vlan add dev {ifname} vid {vif} self'
+                    self._cmd(cmd)
+            
+            # VLAN of bridge parent interface is always 1
+            # VLAN 1 is the default VLAN for all unlabeled packets
+            cmd = f'bridge vlan add dev {ifname} vid 1 pvid untagged self'
+            self._cmd(cmd)
 
         tmp = dict_search('member.interface', config)
         if tmp:
-            if self.get_vlan_filter():
-                bridge_vlan_ids = get_vlan_ids(ifname)
-                # Delete VLAN ID for the bridge
-                if 1 in bridge_vlan_ids:
-                    bridge_vlan_ids.remove(1)
-                for vlan in bridge_vlan_ids:
-                    vlan_del.add(str(vlan))
 
             for interface, interface_config in tmp.items():
                 # if interface does yet not exist bail out early and
@@ -315,62 +326,27 @@ class BridgeIf(Interface):
                     value = interface_config.get('priority')
                     lower.set_path_priority(value)
 
-                tmp = dict_search('native_vlan_removed', interface_config)
-
-                for vlan_id in (tmp or []):
-                    cmd = f'bridge vlan del dev {interface} vid {vlan_id}'
-                    self._cmd(cmd)
-                    cmd = f'bridge vlan add dev {interface} vid 1 pvid untagged master'
-                    self._cmd(cmd)
-                    vlan_del.add(vlan_id)
-                    vlan_add.add(1)
-
-                tmp = dict_search('allowed_vlan_removed', interface_config)
-
-
-                for vlan_id in (tmp or []):
-                    cmd = f'bridge vlan del dev {interface} vid {vlan_id}'
-                    self._cmd(cmd)
-                    vlan_del.add(vlan_id)
-
-                if 'native_vlan' in interface_config:
-                    vlan_filter = 1
-                    cmd = f'bridge vlan del dev {interface} vid 1'
-                    self._cmd(cmd)
-                    vlan_id = interface_config['native_vlan']
-                    if int(vlan_id) != 1:
-                        if 1 in vlan_add:
-                            vlan_add.remove(1)
-                        vlan_del.add(1)
-                    cmd = f'bridge vlan add dev {interface} vid {vlan_id} pvid untagged master'
-                    self._cmd(cmd)
-                    vlan_add.add(vlan_id)
-                    if vlan_id in vlan_del:
-                        vlan_del.remove(vlan_id)
-
-                if 'allowed_vlan' in interface_config:
-                    vlan_filter = 1
-                    if 'native_vlan' not in interface_config:
-                        cmd = f'bridge vlan del dev {interface} vid 1'
+                if vlan_filter:
+                    
+                    del_member_vlan_ids = get_vlan_ids(interface)
+                    # Delete all VLAN IDS configured in the interface first
+                    for vlan in del_member_vlan_ids:
+                        cmd = f'bridge vlan del dev {interface} vid {vlan} master'
                         self._cmd(cmd)
-                        vlan_del.add(1)
-                    for vlan in interface_config['allowed_vlan']:
-                        cmd = f'bridge vlan add dev {interface} vid {vlan} master'
+                    
+                    if 'native_vlan' in interface_config:
+                        vlan_id = interface_config['native_vlan']
+                        cmd = f'bridge vlan add dev {interface} vid {vlan_id} pvid untagged master'
+                        self._cmd(cmd)
+                    else:
+                        # VLAN 1 is the default VLAN for all unlabeled packets
+                        cmd = f'bridge vlan add dev {interface} vid 1 pvid untagged master'
                         self._cmd(cmd)
-                        vlan_add.add(vlan)
-                        if vlan in vlan_del:
-                            vlan_del.remove(vlan)
-
-        for vlan in vlan_del:
-            cmd = f'bridge vlan del dev {ifname} vid {vlan} self'
-            self._cmd(cmd)
-
-        for vlan in vlan_add:
-            cmd = f'bridge vlan add dev {ifname} vid {vlan} self'
-            self._cmd(cmd)
 
-        # enable/disable Vlan Filter
-        self.set_vlan_filter(vlan_filter)
+                    if 'allowed_vlan' in interface_config:
+                        for vlan in interface_config['allowed_vlan']:
+                            cmd = f'bridge vlan add dev {interface} vid {vlan} master'
+                            self._cmd(cmd)
 
 
         # Enable/Disable of an interface must always be done at the end of the