topotests: test direct-table on different VRFs

Test new zebra feature that allows table-direct to work on any VRF
with BGP.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

tests/topotests/bgp_table_direct_topo1/r1/frr.conf

@@ -0,0 +1,31 @@
+log commands
+!
+debug bgp zebra
+debug zebra events
+!
+ip route 10.254.254.1/32 lo table 2000
+ip route 10.254.254.2/32 lo table 2000
+ip route 10.254.254.3/32 lo table 2000
+!
+interface r1-eth0
+ ip address 192.168.10.1/24
+!
+interface r1-eth1 vrf blue
+ ip address 192.168.20.1/24
+!
+router bgp 65001
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 192.168.10.2 remote-as external
+ address-family ipv4 unicast
+  redistribute table-direct 2000
+ exit-address-family
+!
+router bgp 65001 vrf blue
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 192.168.20.2 remote-as external
+ address-family ipv4 unicast
+  redistribute table-direct 2000
+ exit-address-family
+!

tests/topotests/bgp_table_direct_topo1/r2/frr.conf

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+log commands
+!
+interface r2-eth0
+ ip address 192.168.10.2/24
+!
+router bgp 65002
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 192.168.10.1 remote-as external
+!

tests/topotests/bgp_table_direct_topo1/r3/frr.conf

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+log commands
+!
+interface r3-eth0
+ ip address 192.168.20.2/24
+!
+router bgp 65003
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 192.168.20.1 remote-as external
+!

tests/topotests/bgp_table_direct_topo1/test_bgp_table_direct_topo1.py

@@ -0,0 +1,201 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+#
+# test_bgp_table_direct_topo1.py
+# Part of NetDEF Topology Tests
+#
+# Copyright (c) 2025 by
+# Network Device Education Foundation, Inc. ("NetDEF")
+#
+
+"""
+test_bgp_table_direct_topo1.py: Test the FRR PIM MSDP peer.
+"""
+
+import os
+import sys
+import json
+from functools import partial
+import re
+import pytest
+
+# Save the Current Working Directory to find configuration files.
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+# Import topogen and topotest helpers
+from lib import topotest
+
+# Required to instantiate the topology builder class.
+from lib.topogen import Topogen, TopoRouter, get_topogen
+from lib.topolog import logger
+
+from lib.pim import McastTesterHelper
+
+pytestmark = [pytest.mark.bgpd, pytest.mark.pimd]
+
+app_helper = McastTesterHelper()
+
+
+def build_topo(tgen):
+    """
+    +----+     +----+
+    | r1 | <-> | r2 |
+    +----+     +----+
+       |
+       |       +----+
+       --------| r3 |
+               +----+
+    """
+
+    # Create 3 routers
+    for routern in range(1, 4):
+        tgen.add_router(f"r{routern}")
+
+    switch = tgen.add_switch("s1")
+    switch.add_link(tgen.gears["r1"])
+    switch.add_link(tgen.gears["r2"])
+
+    switch = tgen.add_switch("s2")
+    switch.add_link(tgen.gears["r1"])
+    switch.add_link(tgen.gears["r3"])
+
+
+def setup_module(mod):
+    "Sets up the pytest environment"
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+    for _, router in router_list.items():
+        router.load_frr_config(os.path.join(CWD, f"{router.name}/frr.conf"))
+
+    tgen.gears["r1"].run("ip link add blue type vrf table 10")
+    tgen.gears["r1"].run("ip link set blue up")
+    tgen.gears["r1"].run("ip link set r1-eth1 master blue")
+
+    # Initialize all routers.
+    tgen.start_router()
+
+    app_helper.init(tgen)
+
+
+def teardown_module():
+    "Teardown the pytest environment"
+    tgen = get_topogen()
+    app_helper.cleanup()
+    tgen.stop_topology()
+
+
+def expect_bgp_route(router, iptype, route, missing=False):
+    "Wait until route is present on RIB for protocol."
+    if missing:
+        logger.info("waiting route {} go missing in {}".format(route, router))
+    else:
+        logger.info("waiting route {} in {}".format(route, router))
+
+    tgen = get_topogen()
+    expected_output = {route: [{"protocol": "bgp"}]}
+    wait_time = 130
+    if missing:
+        expected_output = {route: None}
+        wait_time = 5
+
+    test_func = partial(
+        topotest.router_json_cmp,
+        tgen.gears[router],
+        "show {} route json".format(iptype),
+        expected_output
+    )
+
+    _, result = topotest.run_and_expect(test_func, None, count=130, wait=1)
+    assertmsg = f'"{router}" convergence failure'
+    assert result is None, assertmsg
+
+
+def test_bgp_convergence():
+    "Wait for BGP protocol convergence"
+    tgen = get_topogen()
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    logger.info("waiting for protocols to converge")
+
+    # Wait for R2
+    expect_bgp_route("r2", "ip", "10.254.254.1/32")
+    expect_bgp_route("r2", "ip", "10.254.254.2/32")
+    expect_bgp_route("r2", "ip", "10.254.254.3/32")
+
+    # Wait for R3
+    expect_bgp_route("r3", "ip", "10.254.254.1/32")
+    expect_bgp_route("r3", "ip", "10.254.254.2/32")
+    expect_bgp_route("r3", "ip", "10.254.254.3/32")
+
+
+def test_route_change_convergence():
+    "Change routes in table 2000 to test zebra redistribution."
+    tgen = get_topogen()
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    tgen.gears["r1"].vtysh_cmd("""
+        configure terminal
+        no ip route 10.254.254.2/32 lo table 2000
+        ip route 10.254.254.10/32 lo table 2000
+    """)
+
+    # Check R2
+    expect_bgp_route("r2", "ip", "10.254.254.2/32", missing=True)
+    expect_bgp_route("r2", "ip", "10.254.254.10/32")
+
+    # Check R3
+    expect_bgp_route("r3", "ip", "10.254.254.2/32", missing=True)
+    expect_bgp_route("r3", "ip", "10.254.254.10/32")
+
+
+def test_configuration_removal_convergence():
+    "Remove table direct configuration and check if routes went missing."
+    tgen = get_topogen()
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    tgen.gears["r1"].vtysh_cmd("""
+        configure terminal
+        router bgp 65001
+         address-family ipv4 unicast
+          no redistribute table-direct 2000
+         exit-address-family
+        exit
+
+        router bgp 65001 vrf blue
+         address-family ipv4 unicast
+          no redistribute table-direct 2000
+         exit-address-family
+        exit
+    """)
+
+    # Check R2
+    expect_bgp_route("r2", "ip", "10.254.254.1/32", missing=True)
+    expect_bgp_route("r2", "ip", "10.254.254.3/32", missing=True)
+    expect_bgp_route("r2", "ip", "10.254.254.10/32", missing=True)
+
+    # Check R3
+    expect_bgp_route("r3", "ip", "10.254.254.1/32", missing=True)
+    expect_bgp_route("r3", "ip", "10.254.254.3/32", missing=True)
+    expect_bgp_route("r3", "ip", "10.254.254.10/32", missing=True)
+
+
+def test_memory_leak():
+    "Run the memory leak test and report results."
+    tgen = get_topogen()
+    if not tgen.is_memleak_enabled():
+        pytest.skip("Memory leak test/report is disabled")
+
+    tgen.report_memory_leaks()
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))