tests: multiple OSPF routers connected to a single switch

tests/topotests/ospf_single_switch/r1_frr.conf

@@ -0,0 +1,18 @@
+!
+hostname r1
+ip forwarding
+!
+interface r1-eth0
+  ip address 203.0.113.1/24
+  ip ospf network point-to-multipoint
+  ip ospf area 0.0.0.0
+  !ip ospf prefix-suppression
+!
+interface r1-eth1
+  ip address 10.0.1.1/24
+  ip ospf passive
+  ip ospf area 0.0.0.0
+!
+router ospf
+  ospf router-id 10.0.0.1
+!

tests/topotests/ospf_single_switch/r2_frr.conf

@@ -0,0 +1,18 @@
+!
+hostname r2
+ip forwarding
+!
+interface r2-eth0
+  ip address 203.0.113.2/24
+  ip ospf network point-to-multipoint
+  ip ospf area 0.0.0.0
+  !ip ospf prefix-suppression
+!
+interface r2-eth1
+  ip address 10.0.2.1/24
+  ip ospf passive
+  ip ospf area 0.0.0.0
+!
+router ospf
+  ospf router-id 10.0.0.2
+!

tests/topotests/ospf_single_switch/r3_frr.conf

@@ -0,0 +1,18 @@
+!
+hostname r3
+ip forwarding
+!
+interface r3-eth0
+  ip address 203.0.113.3/24
+  ip ospf network point-to-multipoint
+  ip ospf area 0.0.0.0
+  !ip ospf prefix-suppression
+!
+interface r3-eth1
+  ip address 10.0.3.1/24
+  ip ospf passive
+  ip ospf area 0.0.0.0
+!
+router ospf
+  ospf router-id 10.0.0.3
+!

tests/topotests/ospf_single_switch/r4_frr.conf

@@ -0,0 +1,18 @@
+!
+hostname r4
+ip forwarding
+!
+interface r4-eth0
+  ip address 203.0.113.4/24
+  ip ospf network point-to-multipoint
+  ip ospf area 0.0.0.0
+  !ip ospf prefix-suppression
+!
+interface r4-eth1
+  ip address 10.0.4.1/24
+  ip ospf passive
+  ip ospf area 0.0.0.0
+!
+router ospf
+  ospf router-id 10.0.0.4
+!

tests/topotests/ospf_single_switch/r5_frr.conf

@@ -0,0 +1,18 @@
+!
+hostname r5
+ip forwarding
+!
+interface r5-eth0
+  ip address 203.0.113.5/24
+  ip ospf network point-to-multipoint
+  ip ospf area 0.0.0.0
+  !ip ospf prefix-suppression
+!
+interface r5-eth1
+  ip address 10.0.5.1/24
+  ip ospf passive
+  ip ospf area 0.0.0.0
+!
+router ospf
+  ospf router-id 10.0.0.5
+!

tests/topotests/ospf_single_switch/r6_frr.conf

@@ -0,0 +1,18 @@
+!
+hostname r6
+ip forwarding
+!
+interface r6-eth0
+  ip address 203.0.113.6/24
+  ip ospf network point-to-multipoint
+  ip ospf area 0.0.0.0
+  !ip ospf prefix-suppression
+!
+interface r6-eth1
+  ip address 10.0.6.1/24
+  ip ospf passive
+  ip ospf area 0.0.0.0
+!
+router ospf
+  ospf router-id 10.0.0.6
+!

tests/topotests/ospf_single_switch/r7_frr.conf

@@ -0,0 +1,18 @@
+!
+hostname r7
+ip forwarding
+!
+interface r7-eth0
+  ip address 203.0.113.7/24
+  ip ospf network point-to-multipoint
+  ip ospf area 0.0.0.0
+  !ip ospf prefix-suppression
+!
+interface r7-eth1
+  ip address 10.0.7.1/24
+  ip ospf passive
+  ip ospf area 0.0.0.0
+!
+router ospf
+  ospf router-id 10.0.0.7
+!

tests/topotests/ospf_single_switch/r8_frr.conf

@@ -0,0 +1,18 @@
+!
+hostname r8
+ip forwarding
+!
+interface r8-eth0
+  ip address 203.0.113.8/24
+  ip ospf network point-to-multipoint
+  ip ospf area 0.0.0.0
+  !ip ospf prefix-suppression
+!
+interface r8-eth1
+  ip address 10.0.8.1/24
+  ip ospf passive
+  ip ospf area 0.0.0.0
+!
+router ospf
+  ospf router-id 10.0.0.8
+!

tests/topotests/ospf_single_switch/test_ospf_single_switch.py

@@ -0,0 +1,189 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+#
+# Copyright (c) 2023 by
+# Adriano Marto Reis <[email protected]>
+#
+
+import os
+import sys
+import json
+import subprocess
+from functools import partial
+import pytest
+
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+from lib.topolog import logger
+
+from lib.common_config import verify_rib
+from lib.ospf import verify_ospf_rib
+from _ast import Try
+
+pytestmark = pytest.mark.ospfd
+
+"""
+A large set of routers are connected to the same switch. Each router shares a
+single network. All shared networks must be reachable from all routers.
+"""
+
+TOPOLOGY = """
+       net1             net2                              netN
+       ---              ---                               ---
+        |                |            OSPF-passive         |
+        |                |                                 |
+    +---+---+        +---+---+                         +---+---+
+    |       |        |       |                         |       |
+    |  r1   |        |  r2   |          (...)          |  rN   |
+    |       |        |       |                         |       |
+    +---+---+        +---+---+                         +---+---+
+        |                |           OSPF-active          |
+        |                |                                |
+        +----------------+--------------------------------+
+                             switch
+
+
+"""
+
+N_ROUTERS = 8
+
+# Save the Current Working Directory to find configuration files.
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+
+def build_topo(tgen):
+    "Build the topology"
+
+    # Create a single switch to connect all the routers
+    switch = tgen.add_switch("switch")
+
+    # Create routers
+    for router_id in range(1, N_ROUTERS + 1):
+        router = tgen.add_router(f"r{router_id}")
+        switch.add_link(router)
+
+        # The shared network needs to be connected to something
+        dummy = tgen.add_switch(f"s{router_id}")
+        dummy.add_link(router)
+
+
+def setup_module(mod):
+    logger.info("OSPF single switch:\n {}".format(TOPOLOGY))
+
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+
+    # Starting Routers
+    router_list = tgen.routers()
+
+    for rname, router in router_list.items():
+        logger.info("Loading router %s" % rname)
+        router.load_frr_config(os.path.join(CWD, "{}_frr.conf".format(rname)))
+
+    # Initialize all routers.
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    "Tear-down the test environment"
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def is_iproute2_json_supported():
+    """
+    Checks if the command 'ip -j route' is supported.
+    """
+    try:
+        output = subprocess.run(['ip', '-j', 'route', 'get', '0.0.0.0'], stdout=subprocess.PIPE).stdout.decode()
+        json.loads(output)
+        return True
+    except json.decoder.JSONDecodeError:
+        return False
+
+
+@pytest.mark.skipif(not is_iproute2_json_supported(), reason="'ip -j route' not supported")
+def test_all_routes_advertised():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip("Skipped because of router(s) failure")
+
+    # networks advertised by each router and the expected next hops
+    networks = {
+        "r1": ("10.0.1.0/24", "203.0.113.1"),
+        "r2": ("10.0.2.0/24", "203.0.113.2"),
+        "r3": ("10.0.3.0/24", "203.0.113.3"),
+        "r4": ("10.0.4.0/24", "203.0.113.4"),
+        "r5": ("10.0.5.0/24", "203.0.113.5"),
+        "r6": ("10.0.6.0/24", "203.0.113.6"),
+        "r7": ("10.0.7.0/24", "203.0.113.7"),
+        "r8": ("10.0.8.0/24", "203.0.113.8"),
+    }
+
+    for router_orig in tgen.routers().keys():
+        for router_dest, network in networks.items():
+            if router_orig != router_dest:
+                input_dict = {
+                    router_orig: {
+                        "static_routes": [
+                            {
+                                "network": network[0],
+                            }
+                        ]
+                    }
+                }
+                result = verify_ospf_rib(tgen, router_orig, input_dict, next_hop=network[1])
+                assert result is True, "Error: {}".format(result)
+                result = verify_rib(tgen, "ipv4", router_orig, input_dict, next_hop=network[1])
+                assert result is True, "Error: {}".format(result)
+
+                check_route(router_orig, network[0], network[1])
+
+
+def check_route(router_name, network, expected_nexthop):
+    """
+    Checks if the given network is present on the given router and has the
+    expected next hop.
+    """
+    tgen = get_topogen()
+    router = tgen.gears[router_name]
+
+    expected_response = {
+        network: [
+            {
+                "prefix": network,
+                "protocol": "ospf",
+                "nexthops": [
+                    {
+                        "ip": expected_nexthop,
+                        "active": True,
+                    },
+                ],
+            },
+        ],
+    }
+
+    test_func = partial(
+        topotest.router_json_cmp,
+        router,
+        f"show ip route {network} json",
+        expected_response,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
+    assert (
+        result is None
+    ), f"{router_name} (ospfd): no route {network} via {expected_nexthop}"
+
+    address = network.split("/")[0]
+    output = router.cmd(f"ip -j route get {address}")
+    logger.info(output)
+    routes = json.loads(output)
+    assert routes[0]["gateway"] == expected_nexthop, f"{router_name} (kernel): no route {address} via {expected_nexthop}"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))