daemon: updates to network base to set default behavior for abstract function

daemon/core/nodes/base.py

@@ -969,7 +969,15 @@ class CoreNetworkBase(NodeBase):
         """
         raise NotImplementedError
 
+    @abc.abstractmethod
     def custom_iface(self, node: CoreNode, iface_data: InterfaceData) -> CoreInterface:
+        """
+        Defines custom logic for creating an interface, if required.
+
+        :param node: node to create interface for
+        :param iface_data: data for creating interface
+        :return: created interface
+        """
         raise NotImplementedError
 
     def get_linked_iface(self, net: "CoreNetworkBase") -> Optional[CoreInterface]:

daemon/core/nodes/network.py

@@ -22,7 +22,7 @@ from core.emulator.enumerations import (
 )
 from core.errors import CoreCommandError, CoreError
 from core.executables import NFTABLES
-from core.nodes.base import CoreNetworkBase
+from core.nodes.base import CoreNetworkBase, CoreNode
 from core.nodes.interface import CoreInterface, GreTap, Veth
 from core.nodes.netclient import get_net_client
 
@@ -436,6 +436,9 @@ class CoreNetwork(CoreNetworkBase):
         for ip in ips:
             self.net_client.create_address(self.brname, ip)
 
+    def custom_iface(self, node: CoreNode, iface_data: InterfaceData) -> CoreInterface:
+        raise CoreError(f"{type(self).__name__} does not support, custom interfaces")
+
 
 class GreTapBridge(CoreNetwork):
     """