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docker/routlin-dash/app/sanitize.py

@@ -223,6 +223,14 @@ _DOTTED_TO_PREFIX = {
     '255.255.255.248': 29, '255.255.255.252': 30,
 }
 
+def vlan_id(value):
+    """VLAN ID integer 1-4094. Returns int or None."""
+    try:
+        n = int(str(value).strip())
+        return n if 1 <= n <= 4094 else None
+    except (ValueError, TypeError):
+        return None
+
 def subnet_mask(value):
     """Subnet prefix length 1-30 (integer). Also accepts legacy dotted notation.
     Returns int on success, None if invalid."""