EC2: DestinationCidrBlock filter for DescribeRouteTables (#5932)

moto/ec2/models/route_tables.py

@@ -95,6 +95,12 @@ class RouteTable(TaggedEC2Resource, CloudFormationModel):
             return self.all_associations_ids
         elif filter_name == "association.subnet-id":
             return self.associations.values()
+        elif filter_name == "route.destination-cidr-block":
+            return [
+                route.destination_cidr_block
+                for route in self.routes.values()
+                if route.destination_cidr_block is not None
+            ]
         elif filter_name == "route.gateway-id":
             return [
                 route.gateway.id

tests/test_ec2/test_route_tables.py

@@ -147,6 +147,21 @@ def test_route_tables_filters_standard():
         [route["GatewayId"] == igw.id for table in resp for route in table["Routes"]]
     )
 
+    # Filter by route destination CIDR block
+    resp = client.describe_route_tables(
+        Filters=[
+            {"Name": "route.destination-cidr-block", "Values": ["10.0.0.4/24"]},
+        ]
+    )["RouteTables"]
+    assert any([route_table["RouteTableId"] == route_table2.id for route_table in resp])
+    assert any(
+        [
+            route["DestinationCidrBlock"] == "10.0.0.4/24"
+            for table in resp
+            for route in table["Routes"]
+        ]
+    )
+
     # Unsupported filter
     if not settings.TEST_SERVER_MODE:
         # ServerMode will just throw a generic 500