vyos.ifconfig: T1579: remove calls to vyos.ifconfig.Interface.get_config()

Interface.get_config() was always a pure helper which exposed a "per interface
type" dictionary which was then fed by the caller to create interfaces by
iproute2 which required additional options during creation time.

Such interfaces had been:
 * tunnel
 * vxlan
 * geneve
 * macsec
 * wifi
 * macvlan / pseudo-ethernet

The code was always duplicated to convert from the VyOS CLI based get_config_dict()
to a dict which can be used to feed iproute2.

This path has been removed and we now always feed in the entire dictionary
retrieved by get_config_dict() or in the interfaces case, it's high-level wrapper
get_interface_dict() to the interface we wan't to create.

This also adds the - personally long awaited - possibility to get rid of the
derived tunnel classes for e.g. GRE, IPIP, IPIP6 and so on.

21 files changed, 191 insertions, 393 deletions

diff --git a/python/vyos/ifconfig/__init__.py b/python/vyos/ifconfig/__init__.py
index f7b55c9dd..129524bda 100644
--- a/python/vyos/ifconfig/__init__.py
+++ b/python/vyos/ifconfig/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -30,7 +30,6 @@ from vyos.ifconfig.vxlan import VXLANIf
 from vyos.ifconfig.wireguard import WireGuardIf
 from vyos.ifconfig.vtun import VTunIf
 from vyos.ifconfig.vti import VTIIf
-from vyos.ifconfig.pppoe import PPPoEIf
 from vyos.ifconfig.tunnel import GREIf
 from vyos.ifconfig.tunnel import GRETapIf
 from vyos.ifconfig.tunnel import IP6GREIf
diff --git a/python/vyos/ifconfig/bond.py b/python/vyos/ifconfig/bond.py
index 709222b09..28b5da3ee 100644
--- a/python/vyos/ifconfig/bond.py
+++ b/python/vyos/ifconfig/bond.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -31,9 +31,7 @@ class BondIf(Interface):
     monitoring may be performed.
     """
 
-    default = {
-        'type': 'bond',
-    }
+    iftype = 'bond'
     definition = {
         **Interface.definition,
         ** {
diff --git a/python/vyos/ifconfig/bridge.py b/python/vyos/ifconfig/bridge.py
index 1bd617a05..69f652547 100644
--- a/python/vyos/ifconfig/bridge.py
+++ b/python/vyos/ifconfig/bridge.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -34,10 +34,7 @@ class BridgeIf(Interface):
 
     The Linux bridge code implements a subset of the ANSI/IEEE 802.1d standard.
     """
-
-    default = {
-        'type': 'bridge',
-    }
+    iftype = 'bridge'
     definition = {
         **Interface.definition,
         **{
@@ -283,21 +280,21 @@ class BridgeIf(Interface):
         if int(vlan_filter):
             add_vlan = []
             cur_vlan_ids = get_vlan_ids(ifname)
-            
+
             tmp = dict_search('vif', config)
             if tmp:
                 for vif, vif_config in tmp.items():
                     add_vlan.append(vif)
-            
+
             # Remove redundant VLANs from the system
             for vlan in list_diff(cur_vlan_ids, add_vlan):
                 cmd = f'bridge vlan del dev {ifname} vid {vlan} self'
                 self._cmd(cmd)
-            
+
             for vlan in add_vlan:
                 cmd = f'bridge vlan add dev {ifname} vid {vlan} 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'
@@ -337,7 +334,7 @@ class BridgeIf(Interface):
                     native_vlan_id = None
                     allowed_vlan_ids= []
                     cur_vlan_ids = get_vlan_ids(interface)
-                    
+
                     if 'native_vlan' in interface_config:
                         vlan_id = interface_config['native_vlan']
                         add_vlan.append(vlan_id)
@@ -353,12 +350,12 @@ class BridgeIf(Interface):
                             else:
                                 add_vlan.append(vlan)
                                 allowed_vlan_ids.append(vlan)
-                    
+
                     # Remove redundant VLANs from the system
                     for vlan in list_diff(cur_vlan_ids, add_vlan):
                         cmd = f'bridge vlan del dev {interface} vid {vlan} master'
                         self._cmd(cmd)
-                    
+
                     for vlan in allowed_vlan_ids:
                         cmd = f'bridge vlan add dev {interface} vid {vlan} master'
                         self._cmd(cmd)
diff --git a/python/vyos/ifconfig/control.py b/python/vyos/ifconfig/control.py
index 43136f361..d41dfef47 100644
--- a/python/vyos/ifconfig/control.py
+++ b/python/vyos/ifconfig/control.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
diff --git a/python/vyos/ifconfig/dummy.py b/python/vyos/ifconfig/dummy.py
index 19ef9d304..0019fc52b 100644
--- a/python/vyos/ifconfig/dummy.py
+++ b/python/vyos/ifconfig/dummy.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -23,9 +23,7 @@ class DummyIf(Interface):
     packets through without actually transmitting them.
     """
 
-    default = {
-        'type': 'dummy',
-    }
+    iftype = 'dummy'
     definition = {
         **Interface.definition,
         **{
diff --git a/python/vyos/ifconfig/erspan.py b/python/vyos/ifconfig/erspan.py
index 50230e14a..e0f72109d 100755
--- a/python/vyos/ifconfig/erspan.py
+++ b/python/vyos/ifconfig/erspan.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -31,12 +31,7 @@ class _ERSpan(Interface):
     """
     _ERSpan: private base class for ERSPAN tunnels
     """
-    default = {
-        **Interface.default,
-        **{
-            'type': 'erspan',
-        }
-    }
+    iftype = 'erspan'
     definition = {
         **Interface.definition,
         **{
@@ -44,18 +39,23 @@ class _ERSpan(Interface):
             'prefixes': ['ersp',],
         },
     }
-    
-    options = ['local_ip','remote_ip','encapsulation','parameters']
-    
+
     def __init__(self,ifname,**config):
         self.config = deepcopy(config) if config else {}
         super().__init__(ifname, **self.config)
-    
+
     def change_options(self):
         pass
-    
+
     def update(self, config):
-        
+        """ General helper function which works on a dictionary retrived by
+        get_config_dict(). It's main intention is to consolidate the scattered
+        interface setup code and provide a single point of entry when workin
+        on any interface. """
+
+        # call base class first
+        super().update(config)
+
         # Enable/Disable of an interface must always be done at the end of the
         # derived class to make use of the ref-counting set_admin_state()
         # function. We will only enable the interface if 'up' was called as
@@ -63,10 +63,9 @@ class _ERSpan(Interface):
         # as certain parameters can only be changed when the interface is
         # in admin-down state. This ensures the link does not flap during
         # reconfiguration.
-        super().update(config)
         state = 'down' if 'disable' in config else 'up'
         self.set_admin_state(state)
-    
+
     def _create(self):
         pass
 
@@ -74,7 +73,7 @@ class ERSpanIf(_ERSpan):
     """
     ERSpanIf: private base class for ERSPAN Over GRE and IPv4 tunnels
     """
-    
+
     def _create(self):
         ifname = self.config['ifname']
         local_ip = self.config['local_ip']
@@ -82,7 +81,7 @@ class ERSpanIf(_ERSpan):
         key = self.config['parameters']['ip']['key']
         version = self.config['parameters']['version']
         command = f'ip link add dev {ifname} type erspan local {local_ip} remote {remote_ip} seq key {key} erspan_ver {version}'
-        
+
         if int(version) == 1:
             idx=dict_search('parameters.erspan.idx',self.config)
             if idx:
@@ -94,16 +93,16 @@ class ERSpanIf(_ERSpan):
             hwid=dict_search('parameters.erspan.hwid',self.config)
             if hwid:
                 command += f' erspan_hwid {hwid}'
-        
+
         ttl = dict_search('parameters.ip.ttl',self.config)
         if ttl:
             command += f' ttl {ttl}'
         tos = dict_search('parameters.ip.tos',self.config)
         if tos:
             command += f' tos {tos}'
-                
+
         self._cmd(command)
-    
+
     def change_options(self):
         ifname = self.config['ifname']
         local_ip = self.config['local_ip']
@@ -111,7 +110,7 @@ class ERSpanIf(_ERSpan):
         key = self.config['parameters']['ip']['key']
         version = self.config['parameters']['version']
         command = f'ip link set dev {ifname} type erspan local {local_ip} remote {remote_ip} seq key {key} erspan_ver {version}'
-        
+
         if int(version) == 1:
             idx=dict_search('parameters.erspan.idx',self.config)
             if idx:
@@ -123,21 +122,21 @@ class ERSpanIf(_ERSpan):
             hwid=dict_search('parameters.erspan.hwid',self.config)
             if hwid:
                 command += f' erspan_hwid {hwid}'
-        
+
         ttl = dict_search('parameters.ip.ttl',self.config)
         if ttl:
             command += f' ttl {ttl}'
         tos = dict_search('parameters.ip.tos',self.config)
         if tos:
             command += f' tos {tos}'
-                
+
         self._cmd(command)
 
 class ER6SpanIf(_ERSpan):
     """
     ER6SpanIf: private base class for ERSPAN Over GRE and IPv6 tunnels
     """
-    
+
     def _create(self):
         ifname = self.config['ifname']
         local_ip = self.config['local_ip']
@@ -145,7 +144,7 @@ class ER6SpanIf(_ERSpan):
         key = self.config['parameters']['ip']['key']
         version = self.config['parameters']['version']
         command = f'ip link add dev {ifname} type ip6erspan local {local_ip} remote {remote_ip} seq key {key} erspan_ver {version}'
-        
+
         if int(version) == 1:
             idx=dict_search('parameters.erspan.idx',self.config)
             if idx:
@@ -157,16 +156,16 @@ class ER6SpanIf(_ERSpan):
             hwid=dict_search('parameters.erspan.hwid',self.config)
             if hwid:
                 command += f' erspan_hwid {hwid}'
-        
+
         ttl = dict_search('parameters.ip.ttl',self.config)
         if ttl:
             command += f' ttl {ttl}'
         tos = dict_search('parameters.ip.tos',self.config)
         if tos:
             command += f' tos {tos}'
-                
+
         self._cmd(command)
-    
+
     def change_options(self):
         ifname = self.config['ifname']
         local_ip = self.config['local_ip']
@@ -174,7 +173,7 @@ class ER6SpanIf(_ERSpan):
         key = self.config['parameters']['ip']['key']
         version = self.config['parameters']['version']
         command = f'ip link set dev {ifname} type ip6erspan local {local_ip} remote {remote_ip} seq key {key} erspan_ver {version}'
-        
+
         if int(version) == 1:
             idx=dict_search('parameters.erspan.idx',self.config)
             if idx:
@@ -186,5 +185,5 @@ class ER6SpanIf(_ERSpan):
             hwid=dict_search('parameters.erspan.hwid',self.config)
             if hwid:
                 command += f' erspan_hwid {hwid}'
-                
+
         self._cmd(command)
diff --git a/python/vyos/ifconfig/ethernet.py b/python/vyos/ifconfig/ethernet.py
index 547b54b84..aca0aeead 100644
--- a/python/vyos/ifconfig/ethernet.py
+++ b/python/vyos/ifconfig/ethernet.py
@@ -26,10 +26,7 @@ class EthernetIf(Interface):
     """
     Abstraction of a Linux Ethernet Interface
     """
-
-    default = {
-        'type': 'ethernet',
-    }
+    iftype = 'ethernet'
     definition = {
         **Interface.definition,
         **{
diff --git a/python/vyos/ifconfig/geneve.py b/python/vyos/ifconfig/geneve.py
index 5c4597be8..1b3ee0dc9 100644
--- a/python/vyos/ifconfig/geneve.py
+++ b/python/vyos/ifconfig/geneve.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -26,14 +26,7 @@ class GeneveIf(Interface):
     https://developers.redhat.com/blog/2019/05/17/an-introduction-to-linux-virtual-interfaces-tunnels/#geneve
     https://lwn.net/Articles/644938/
     """
-
-    default = {
-        'type': 'geneve',
-        'vni': 0,
-        'remote': '',
-    }
-    options = Interface.options + \
-        ['vni', 'remote']
+    iftype = 'geneve'
     definition = {
         **Interface.definition,
         **{
diff --git a/python/vyos/ifconfig/input.py b/python/vyos/ifconfig/input.py
index a6e566d87..db7d2b6b4 100644
--- a/python/vyos/ifconfig/input.py
+++ b/python/vyos/ifconfig/input.py
@@ -17,9 +17,6 @@ from vyos.ifconfig.interface import Interface
 
 @Interface.register
 class InputIf(Interface):
-    default = {
-        'type': '',
-    }
     definition = {
         **Interface.definition,
         **{
diff --git a/python/vyos/ifconfig/interface.py b/python/vyos/ifconfig/interface.py
index 4bdabd432..9c0ee2ab1 100644
--- a/python/vyos/ifconfig/interface.py
+++ b/python/vyos/ifconfig/interface.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -60,7 +60,6 @@ class Interface(Control):
     options = ['debug', 'create']
     required = []
     default = {
-        'type': '',
         'debug': True,
         'create': True,
     }
@@ -232,26 +231,21 @@ class Interface(Control):
         >>> from vyos.ifconfig import Interface
         >>> i = Interface('eth0')
         """
+        self.config = deepcopy(kargs)
+        self.config['ifname'] = self.ifname = ifname
 
-        self.config = deepcopy(self.default)
-        for k in self.options:
-            if k in kargs:
-                self.config[k] = kargs[k]
-
-        # make sure the ifname is the first argument and not from the dict
-        self.config['ifname'] = ifname
         self._admin_state_down_cnt = 0
 
         # we must have updated config before initialising the Interface
         super().__init__(**kargs)
-        self.ifname = ifname
 
         if not self.exists(ifname):
-            # Any instance of Interface, such as Interface('eth0')
-            # can be used safely to access the generic function in this class
-            # as 'type' is unset, the class can not be created
-            if not self.config['type']:
+            # Any instance of Interface, such as Interface('eth0') can be used
+            # safely to access the generic function in this class as 'type' is
+            # unset, the class can not be created
+            if not self.iftype:
                 raise Exception(f'interface "{ifname}" not found')
+            self.config['type'] = self.iftype
 
             # Should an Instance of a child class (EthernetIf, DummyIf, ..)
             # be required, then create should be set to False to not accidentally create it.
@@ -1300,17 +1294,7 @@ class Interface(Control):
 
 class VLANIf(Interface):
     """ Specific class which abstracts 802.1q and 802.1ad (Q-in-Q) VLAN interfaces """
-    default = {
-        'type': 'vlan',
-        'source_interface': '',
-        'vlan_id': '',
-        'protocol': '',
-        'ingress_qos': '',
-        'egress_qos': '',
-    }
-
-    options = Interface.options + \
-        ['source_interface', 'vlan_id', 'protocol', 'ingress_qos', 'egress_qos']
+    iftype = 'vlan'
 
     def remove(self):
         """
@@ -1339,11 +1323,11 @@ class VLANIf(Interface):
             return
 
         cmd = 'ip link add link {source_interface} name {ifname} type vlan id {vlan_id}'
-        if self.config['protocol']:
+        if 'protocol' in self.config:
             cmd += ' protocol {protocol}'
-        if self.config['ingress_qos']:
+        if 'ingress_qos' in self.config:
             cmd += ' ingress-qos-map {ingress_qos}'
-        if self.config['egress_qos']:
+        if 'egress_qos' in self.config:
             cmd += ' egress-qos-map {egress_qos}'
 
         self._cmd(cmd.format(**self.config))
diff --git a/python/vyos/ifconfig/l2tpv3.py b/python/vyos/ifconfig/l2tpv3.py
index 8ed3d5afb..34f8cd4d3 100644
--- a/python/vyos/ifconfig/l2tpv3.py
+++ b/python/vyos/ifconfig/l2tpv3.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -24,19 +24,7 @@ class L2TPv3If(Interface):
     either hot standby or load balancing services. Additionally, link integrity
     monitoring may be performed.
     """
-
-    default = {
-        'type': 'l2tp',
-        'peer_tunnel_id': '',
-        'local_port': 0,
-        'remote_port': 0,
-        'encapsulation': 'udp',
-        'local_address': '',
-        'remote_address': '',
-        'session_id': '',
-        'tunnel_id': '',
-        'peer_session_id': ''
-    }
+    iftype = 'l2tp'
     definition = {
         **Interface.definition,
         **{
@@ -45,20 +33,16 @@ class L2TPv3If(Interface):
             'bridgeable': True,
         }
     }
-    options = Interface.options + \
-        ['tunnel_id', 'peer_tunnel_id', 'local_port', 'remote_port',
-         'encapsulation', 'local_address', 'remote_address', 'session_id',
-         'peer_session_id']
 
     def _create(self):
         # create tunnel interface
         cmd = 'ip l2tp add tunnel tunnel_id {tunnel_id}'
         cmd += ' peer_tunnel_id {peer_tunnel_id}'
-        cmd += ' udp_sport {local_port}'
-        cmd += ' udp_dport {remote_port}'
+        cmd += ' udp_sport {source_port}'
+        cmd += ' udp_dport {destination_port}'
         cmd += ' encap {encapsulation}'
-        cmd += ' local {local_address}'
-        cmd += ' remote {remote_address}'
+        cmd += ' local {local_ip}'
+        cmd += ' remote {remote_ip}'
         self._cmd(cmd.format(**self.config))
 
         # setup session
@@ -82,20 +66,20 @@ class L2TPv3If(Interface):
         >>> i.remove()
         """
 
-        if self.exists(self.config['ifname']):
+        if self.exists(self.ifname):
             # interface is always A/D down. It needs to be enabled explicitly
             self.set_admin_state('down')
 
-            if self.config['tunnel_id'] and self.config['session_id']:
+            if {'tunnel_id', 'session_id'} <= set(self.config):
                 cmd = 'ip l2tp del session tunnel_id {tunnel_id}'
                 cmd += ' session_id {session_id}'
                 self._cmd(cmd.format(**self.config))
 
-            if self.config['tunnel_id']:
+            if 'tunnel_id' in self.config:
                 cmd = 'ip l2tp del tunnel tunnel_id {tunnel_id}'
                 self._cmd(cmd.format(**self.config))
-    
-    
+
+
     def update(self, config):
         """ General helper function which works on a dictionary retrived by
         get_config_dict(). It's main intention is to consolidate the scattered
diff --git a/python/vyos/ifconfig/loopback.py b/python/vyos/ifconfig/loopback.py
index 0e632d826..d323feed8 100644
--- a/python/vyos/ifconfig/loopback.py
+++ b/python/vyos/ifconfig/loopback.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -22,9 +22,8 @@ class LoopbackIf(Interface):
     uses to communicate with itself.
     """
     _persistent_addresses = ['127.0.0.1/8', '::1/128']
-    default = {
-        'type': 'loopback',
-    }
+    iftype = 'loopback'
+
     definition = {
         **Interface.definition,
         **{
@@ -33,9 +32,6 @@ class LoopbackIf(Interface):
             'bridgeable': True,
         }
     }
-
-    name = 'loopback'
-
     def remove(self):
         """
         Loopback interface can not be deleted from operating system. We can
diff --git a/python/vyos/ifconfig/macsec.py b/python/vyos/ifconfig/macsec.py
index 456686ea6..c15273080 100644
--- a/python/vyos/ifconfig/macsec.py
+++ b/python/vyos/ifconfig/macsec.py
@@ -1,4 +1,4 @@
-# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2020-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -27,12 +27,7 @@ class MACsecIf(Interface):
     other security solutions such as IPsec (layer 3) or TLS (layer 4), as all
     those solutions are used for their own specific use cases.
     """
-
-    default = {
-        'type': 'macsec',
-        'security_cipher': '',
-        'source_interface': ''
-    }
+    iftype = 'macsec'
     definition = {
         **Interface.definition,
         **{
@@ -40,8 +35,6 @@ class MACsecIf(Interface):
             'prefixes': ['macsec', ],
         },
     }
-    options = Interface.options + \
-        ['security_cipher', 'source_interface']
 
     def _create(self):
         """
@@ -49,9 +42,9 @@ class MACsecIf(Interface):
         down by default.
         """
         # create tunnel interface
-        cmd  = 'ip link add link {source_interface} {ifname} type {type}'
-        cmd += ' cipher {security_cipher}'
-        self._cmd(cmd.format(**self.config))
+        cmd  = 'ip link add link {source_interface} {ifname} type {type}'.format(**self.config)
+        cmd += f' cipher {self.config["security"]["cipher"]}'
+        self._cmd(cmd)
 
         # interface is always A/D down. It needs to be enabled explicitly
         self.set_admin_state('down')
diff --git a/python/vyos/ifconfig/macvlan.py b/python/vyos/ifconfig/macvlan.py
index 2447fec77..73e2eea9e 100644
--- a/python/vyos/ifconfig/macvlan.py
+++ b/python/vyos/ifconfig/macvlan.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -20,13 +20,7 @@ class MACVLANIf(Interface):
     """
     Abstraction of a Linux MACvlan interface
     """
-
-    default = {
-        'type': 'macvlan',
-        'address': '',
-        'source_interface': '',
-        'mode': '',
-    }
+    iftype = 'macvlan'
     definition = {
         **Interface.definition,
         **{
@@ -34,17 +28,10 @@ class MACVLANIf(Interface):
             'prefixes': ['peth', ],
         },
     }
-    options = Interface.options + \
-        ['source_interface', 'mode']
 
     def _create(self):
         # please do not change the order when assembling the command
-        cmd = 'ip link add {ifname}'
-        if self.config['source_interface']:
-            cmd += ' link {source_interface}'
-        cmd += ' type macvlan'
-        if self.config['mode']:
-            cmd += ' mode {mode}'
+        cmd = 'ip link add {ifname} link {source_interface} type {type} mode {mode}'
         self._cmd(cmd.format(**self.config))
 
     def set_mode(self, mode):
diff --git a/python/vyos/ifconfig/pppoe.py b/python/vyos/ifconfig/pppoe.py
deleted file mode 100644
index 787245696..000000000
--- a/python/vyos/ifconfig/pppoe.py
+++ /dev/null
@@ -1,41 +0,0 @@
-# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
-#
-# This library is free software; you can redistribute it and/or
-# modify it under the terms of the GNU Lesser General Public
-# License as published by the Free Software Foundation; either
-# version 2.1 of the License, or (at your option) any later version.
-#
-# This library is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public
-# License along with this library.  If not, see <http://www.gnu.org/licenses/>.
-
-
-from vyos.ifconfig.interface import Interface
-
-
-@Interface.register
-class PPPoEIf(Interface):
-    default = {
-        'type': 'pppoe',
-    }
-    definition = {
-        **Interface.definition,
-        **{
-            'section': 'pppoe',
-            'prefixes': ['pppoe', ],
-        },
-    }
-
-    # stub this interface is created in the configure script
-
-    def _create(self):
-        # we can not create this interface as it is managed outside
-        pass
-
-    def _delete(self):
-        # we can not create this interface as it is managed outside
-        pass
diff --git a/python/vyos/ifconfig/tunnel.py b/python/vyos/ifconfig/tunnel.py
index 4320bf8bc..271919b90 100644
--- a/python/vyos/ifconfig/tunnel.py
+++ b/python/vyos/ifconfig/tunnel.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -16,13 +16,12 @@
 # https://developers.redhat.com/blog/2019/05/17/an-introduction-to-linux-virtual-interfaces-tunnels/
 # https://community.hetzner.com/tutorials/linux-setup-gre-tunnel
 
-from copy import deepcopy
-
 from netaddr import EUI
 from netaddr import mac_unix_expanded
 from random import getrandbits
 
 from vyos.ifconfig.interface import Interface
+from vyos.util import dict_search
 from vyos.validate import assert_list
 
 def enable_to_on(value):
@@ -32,7 +31,6 @@ def enable_to_on(value):
         return 'off'
     raise ValueError(f'expect enable or disable but got "{value}"')
 
-
 @Interface.register
 class _Tunnel(Interface):
     """
@@ -48,16 +46,30 @@ class _Tunnel(Interface):
         },
     }
 
-    default = {
-        'local' : '',
-        'remote': '',
-        'dev' : '',
-        'ttl' : '',
-        'tos' : '',
-        'key' : '',
-        'raw' : '',
+    # This table represents a mapping from VyOS internal config dict to
+    # arguments used by iproute2. For more information please refer to:
+    # - https://man7.org/linux/man-pages/man8/ip-link.8.html
+    # - https://man7.org/linux/man-pages/man8/ip-tunnel.8.html
+    mapping = {
+        'local_ip'                        : 'local',
+        'remote_ip'                       : 'remote',
+        'source_interface'                : 'dev',
+        'parameters.ip.key'               : 'key',
+        'parameters.ip.tos'               : 'tos',
+        'parameters.ip.ttl'               : 'ttl',
+    }
+    mapping_ipv4 = {
+        'parameters.ip.key'               : 'key',
+        'parameters.ip.no_pmtu_discovery' : 'nopmtudisc',
+        'parameters.ip.tos'               : 'tos',
+        'parameters.ip.ttl'               : 'ttl',
+    }
+    mapping_ipv6 = {
+        'parameters.ipv6.encaplimit'      : 'encaplimit',
+        'parameters.ipv6.flowlabel'       : 'flowlabel',
+        'parameters.ipv6.hoplimit'        : 'hoplimit',
+        'parameters.ipv6.tclass'          : 'tclass',
     }
-    options = Interface.options + list(default.keys())
 
     # TODO: This is surely used for more than tunnels
     # TODO: could be refactored elsewhere
@@ -76,28 +88,49 @@ class _Tunnel(Interface):
             },
         }
     }
-    _create_cmd = 'ip tunnel add {ifname} mode {type}'
 
     def _create(self):
-        # add " option-name option-name-value ..." for all options set
-        options = ' '.join(['{} {}'.format(k, self.config[k])
-                            for k,v in self.config.items() if v and k not in
-                                                    ['ifname', 'type', 'raw']])
-        if 'raw' in self.config:
-            options += ' ' + ' '.join(self.config['raw'])
-        self._cmd('{} {}'.format(self._create_cmd.format(**self.config), options))
+        if self.config['encapsulation'] in ['ipip6', 'ip6ip6', 'ip6gre']:
+            mapping = { **self.mapping, **self.mapping_ipv6 }
+        else:
+            mapping = { **self.mapping, **self.mapping_ipv4 }
+
+        cmd = 'ip tunnel add {ifname} mode {type}'
+        if self.config['encapsulation'] == 'gre-bridge':
+            cmd = 'ip link add name {ifname} type {type}'
+        for vyos_key, iproute2_key in mapping.items():
+            # dict_search will return an empty dict "{}" for valueless nodes like
+            # "parameters.nolearning" - thus we need to test the nodes existence
+            # by using isinstance()
+            tmp = dict_search(vyos_key, self.config)
+            if isinstance(tmp, dict):
+                cmd += f' {iproute2_key}'
+            elif tmp != None:
+                cmd += f' {iproute2_key} {tmp}'
+
+        self._cmd(cmd.format(**self.config))
+
         self.set_admin_state('down')
 
     def change_options(self):
-        change = 'ip tunnel change {ifname} mode {type}'
-
-        # add " option-name option-name-value ..." for all options set
-        options = ' '.join(['{} {}'.format(k, self.config[k])
-                            for k,v in self.config.items() if v and k not in
-                                                    ['ifname', 'type', 'raw']])
-        if 'raw' in self.config:
-            options += ' ' + ' '.join(self.config['raw'])
-        self._cmd('{} {}'.format(change.format(**self.config), options))
+        if self.config['encapsulation'] in ['ipip6', 'ip6ip6', 'ip6gre']:
+            mapping = { **self.mapping, **self.mapping_ipv6 }
+        else:
+            mapping = { **self.mapping, **self.mapping_ipv4 }
+
+        self.config['type'] = self.iftype
+        cmd = 'ip tunnel change {ifname} mode {type}'
+        for vyos_key, iproute2_key in mapping.items():
+            # dict_search will return an empty dict "{}" for valueless nodes like
+            # "parameters.nolearning" - thus we need to test the nodes existence
+            # by using isinstance()
+            tmp = dict_search(vyos_key, self.config)
+            if isinstance(tmp, dict):
+                cmd += f' {iproute2_key}'
+            elif tmp != None:
+                cmd += f' {iproute2_key} {tmp}'
+
+        self._cmd(cmd.format(**self.config))
 
     def get_mac(self):
         """
@@ -151,22 +184,15 @@ class GREIf(_Tunnel):
     https://tools.ietf.org/html/rfc2784
     https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/ip/link_gre.c
     """
-
-    default = {
-        **_Tunnel.default,
-        **{
-            'type': 'gre',
-            'raw' : ['pmtudisc'], # parameters that we can pass raw to ip command
-        },
-    }
+    iftype = 'gre'
 
 # GreTap also called GRE Bridge
 class GRETapIf(_Tunnel):
     """
     GRETapIF: GreIF using TAP instead of TUN
-
     https://en.wikipedia.org/wiki/TUN/TAP
     """
+    iftype = 'gretap'
     # no multicast, ttl or tos for gretap
     definition = {
         **_Tunnel.definition,
@@ -174,15 +200,6 @@ class GRETapIf(_Tunnel):
             'bridgeable': True,
         },
     }
-    default = {
-        'type': 'gretap',
-        'local': '',
-        'remote': '',
-        'dev': '',
-        'raw' : ['pmtudisc'], # parameters that we can pass raw to ip command
-    }
-
-    _create_cmd = 'ip link add name {ifname} type {type}'
 
     def change_options(self):
         pass
@@ -195,16 +212,7 @@ class IP6GREIf(_Tunnel):
     https://tools.ietf.org/html/rfc7676
     https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/ip/link_gre6.c
     """
-    default = {
-        **_Tunnel.default,
-        **{
-            'type': 'ip6gre',
-            'encaplimit': '',
-            'hoplimit': '',
-            'tclass': '',
-            'flowlabel': '',
-        },
-    }
+    iftype = 'ip6gre'
 
 class IPIPIf(_Tunnel):
     """
@@ -213,15 +221,7 @@ class IPIPIf(_Tunnel):
     For more information please refer to:
     https://tools.ietf.org/html/rfc2003
     """
-    # IPIP does not allow to pass multicast, unlike GRE
-    # but the interface itself can be set with multicast
-    default = {
-        **_Tunnel.default,
-        **{
-            'type': 'ipip',
-            'raw' : ['pmtudisc'], # parameters that we can pass raw to ip command
-        },
-    }
+    iftype = 'ipip'
 
 class IPIP6If(_Tunnel):
     """
@@ -230,16 +230,7 @@ class IPIP6If(_Tunnel):
     For more information please refer to:
     https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/ip/link_ip6tnl.c
     """
-    default = {
-        **_Tunnel.default,
-        **{
-            'type': 'ipip6',
-            'encaplimit': '',
-            'hoplimit': '',
-            'tclass': '',
-            'flowlabel': '',
-        },
-    }
+    iftype = 'ipip6'
 
 class IP6IP6If(IPIP6If):
     """
@@ -248,13 +239,7 @@ class IP6IP6If(IPIP6If):
     For more information please refer to:
     https://tools.ietf.org/html/rfc2473
     """
-    default = {
-        **_Tunnel.default,
-        **{
-            'type': 'ip6ip6',
-        },
-    }
-
+    iftype = 'ip6ip6'
 
 class SitIf(_Tunnel):
     """
@@ -263,12 +248,7 @@ class SitIf(_Tunnel):
     For more information please refer to:
     https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/ip/link_iptnl.c
     """
-    default = {
-        **_Tunnel.default,
-        **{
-            'type': 'sit',
-        },
-    }
+    iftype = 'sit'
 
 class Sit6RDIf(SitIf):
     """
@@ -277,14 +257,7 @@ class Sit6RDIf(SitIf):
     https://en.wikipedia.org/wiki/IPv6_rapid_deployment
     """
     # TODO: check if key can really be used with 6RD
-    default = {
-        **_Tunnel.default,
-        **{
-            'type': '6rd',
-            '6rd_prefix' : '',
-            '6rd_relay_prefix' : '',
-        },
-    }
+    iftype = '6rd'
 
     def _create(self):
         # do not call _Tunnel.create, building fully here
diff --git a/python/vyos/ifconfig/vti.py b/python/vyos/ifconfig/vti.py
index d0745898c..e2090c889 100644
--- a/python/vyos/ifconfig/vti.py
+++ b/python/vyos/ifconfig/vti.py
@@ -1,4 +1,4 @@
-# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -17,9 +17,7 @@ from vyos.ifconfig.interface import Interface
 
 @Interface.register
 class VTIIf(Interface):
-    default = {
-        'type': 'vti',
-    }
+    iftype = 'vti'
     definition = {
         **Interface.definition,
         **{
diff --git a/python/vyos/ifconfig/vtun.py b/python/vyos/ifconfig/vtun.py
index 99a592b3e..8f027cf9d 100644
--- a/python/vyos/ifconfig/vtun.py
+++ b/python/vyos/ifconfig/vtun.py
@@ -1,4 +1,4 @@
-# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2020-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -17,10 +17,7 @@ from vyos.ifconfig.interface import Interface
 
 @Interface.register
 class VTunIf(Interface):
-    default = {
-        'type': 'vtun',
-        'device_type': 'tun',
-    }
+    iftype = 'vtun'
     definition = {
         **Interface.definition,
         **{
@@ -29,7 +26,6 @@ class VTunIf(Interface):
             'bridgeable': True,
         },
     }
-    options = Interface.options + ['device_type']
 
     def _create(self):
         """ Depending on OpenVPN operation mode the interface is created
diff --git a/python/vyos/ifconfig/vxlan.py b/python/vyos/ifconfig/vxlan.py
index ad1f605ed..291332a77 100644
--- a/python/vyos/ifconfig/vxlan.py
+++ b/python/vyos/ifconfig/vxlan.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -15,6 +15,7 @@
 
 from vyos import ConfigError
 from vyos.ifconfig.interface import Interface
+from vyos.util import dict_search
 
 @Interface.register
 class VXLANIf(Interface):
@@ -38,16 +39,7 @@ class VXLANIf(Interface):
     https://www.kernel.org/doc/Documentation/networking/vxlan.txt
     """
 
-    default = {
-        'type': 'vxlan',
-        'group': '',
-        'port': 8472,   # The Linux implementation of VXLAN pre-dates
-                        # the IANA's selection of a standard destination port
-        'remote': '',
-        'source_address': '',
-        'source_interface': '',
-        'vni': 0
-    }
+    iftype = 'vxlan'
     definition = {
         **Interface.definition,
         **{
@@ -56,44 +48,35 @@ class VXLANIf(Interface):
             'bridgeable': True,
         }
     }
-    options = Interface.options + \
-        ['group', 'remote', 'source_interface', 'port', 'vni', 'source_address']
-
-    mapping = {
-        'ifname': 'add',
-        'vni':    'id',
-        'port':   'dstport',
-        'source_address': 'local',
-        'source_interface': 'dev',
-    }
 
     def _create(self):
-        cmdline = ['ifname', 'type', 'vni', 'port']
-
-        if self.config['source_address']:
-            cmdline.append('source_address')
-
-        if self.config['remote']:
-            cmdline.append('remote')
-
-        if self.config['group'] or self.config['source_interface']:
-            if self.config['group'] and self.config['source_interface']:
-                cmdline.append('group')
-                cmdline.append('source_interface')
-            else:
-                ifname = self.config['ifname']
-                raise ConfigError(
-                    f'VXLAN "{ifname}" is missing mandatory underlay multicast'
-                     'group or source interface for a multicast network.')
-
-        cmd = 'ip link'
-        for key in cmdline:
-            value = self.config.get(key, '')
-            if not value:
-                continue
-            cmd += ' {} {}'.format(self.mapping.get(key, key), value)
+        # This table represents a mapping from VyOS internal config dict to
+        # arguments used by iproute2. For more information please refer to:
+        # - https://man7.org/linux/man-pages/man8/ip-link.8.html
+        mapping = {
+            'source_address'            : 'local',
+            'source_interface'          : 'dev',
+            'remote'                    : 'remote',
+            'group'                     : 'group',
+            'parameters.ip.tos'         : 'tos',
+            'parameters.ip.ttl'         : 'ttl',
+            'parameters.ipv6.flowlabel' : 'flowlabel',
+            'parameters.nolearning'     : 'nolearning',
+        }
 
-        self._cmd(cmd)
+        cmd = 'ip link add {ifname} type {type} id {vni} dstport {port}'
+        for vyos_key, iproute2_key in mapping.items():
+            # dict_search will return an empty dict "{}" for valueless nodes like
+            # "parameters.nolearning" - thus we need to test the nodes existence
+            # by using isinstance()
+            tmp = dict_search(vyos_key, self.config)
+            if isinstance(tmp, dict):
+                cmd += f' {iproute2_key}'
+            elif tmp != None:
+                cmd += f' {iproute2_key} {tmp}'
+
+        self._cmd(cmd.format(**self.config))
+        self.set_admin_state('down')
 
     def update(self, config):
         """ General helper function which works on a dictionary retrived by
diff --git a/python/vyos/ifconfig/wireguard.py b/python/vyos/ifconfig/wireguard.py
index 9ee798ee8..f377e2b1d 100644
--- a/python/vyos/ifconfig/wireguard.py
+++ b/python/vyos/ifconfig/wireguard.py
@@ -1,4 +1,4 @@
-# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -148,18 +148,7 @@ class WireGuardOperational(Operational):
 @Interface.register
 class WireGuardIf(Interface):
     OperationalClass = WireGuardOperational
-
-    default = {
-        'type': 'wireguard',
-        'port': 0,
-        'private_key': None,
-        'pubkey': None,
-        'psk': '',
-        'allowed_ips': [],
-        'fwmark': 0x00,
-        'endpoint': None,
-        'keepalive': 0
-    }
+    iftype = 'wireguard'
     definition = {
         **Interface.definition,
         **{
@@ -168,9 +157,6 @@ class WireGuardIf(Interface):
             'bridgeable': False,
         }
     }
-    options = Interface.options + \
-        ['port', 'private_key', 'pubkey', 'psk',
-         'allowed_ips', 'fwmark', 'endpoint', 'keepalive']
 
     def get_mac(self):
         """
diff --git a/python/vyos/ifconfig/wireless.py b/python/vyos/ifconfig/wireless.py
index 37703d242..6c0eeec44 100644
--- a/python/vyos/ifconfig/wireless.py
+++ b/python/vyos/ifconfig/wireless.py
@@ -1,4 +1,4 @@
-# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2020-2021 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -20,11 +20,7 @@ class WiFiIf(Interface):
     """
     Handle WIFI/WLAN interfaces.
     """
-
-    default = {
-        'type': 'wifi',
-        'phy': 'phy0'
-    }
+    iftype = 'wifi'
     definition = {
         **Interface.definition,
         **{
@@ -33,14 +29,10 @@ class WiFiIf(Interface):
             'bridgeable': True,
         }
     }
-    options = Interface.options + \
-        ['phy', 'op_mode']
-
     def _create(self):
         # all interfaces will be added in monitor mode
-        cmd = 'iw phy {phy} interface add {ifname} type monitor' \
-            .format(**self.config)
-        self._cmd(cmd)
+        cmd = 'iw phy {physical_device} interface add {ifname} type monitor'
+        self._cmd(cmd.format(**self.config))
 
         # wireless interface is administratively down by default
         self.set_admin_state('down')
@@ -81,14 +73,3 @@ class WiFiIf(Interface):
         # reconfiguration.
         state = 'down' if 'disable' in config else 'up'
         self.set_admin_state(state)
-
-
-@Interface.register
-class WiFiModemIf(WiFiIf):
-    definition = {
-        **WiFiIf.definition,
-        **{
-            'section': 'wirelessmodem',
-            'prefixes': ['wlm', ],
-        }
-    }