tests: Check if BGP BFD session is created correctly with multihop/update-source

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

tests/topotests/bgp_bfd_session/r1/frr.conf

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+!
+interface r1-eth0
+ ip address 10.0.0.1/24
+!
+router bgp 65000
+ neighbor 192.168.1.2 remote-as auto
+ neighbor 192.168.1.2 bfd
+ neighbor 192.168.1.2 ebgp-multihop 10
+ neighbor 192.168.1.2 update-source 10.0.0.1
+exit

tests/topotests/bgp_bfd_session/test_bgp_bfd_session.py

@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+#
+# Copyright (c) 2024 by
+# Donatas Abraitis <donatas@opensourcerouting.org>
+#
+
+import os
+import sys
+import json
+import pytest
+import functools
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+from lib import topotest
+from lib.topogen import Topogen, get_topogen, TopoRouter
+from lib.common_config import step
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def build_topo(tgen):
+    r1 = tgen.add_router("r1")
+
+    switch = tgen.add_switch("s1")
+    switch.add_link(r1)
+
+
+def setup_module(mod):
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+
+    for _, (rname, router) in enumerate(tgen.routers().items(), 1):
+        router.load_frr_config(
+            os.path.join(CWD, "{}/frr.conf".format(rname)),
+            [
+                (TopoRouter.RD_ZEBRA, None),
+                (TopoRouter.RD_MGMTD, None),
+                (TopoRouter.RD_BFD, None),
+                (TopoRouter.RD_BGP, None),
+            ],
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_bfd_session():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+
+    def _bfd_session():
+        output = json.loads(r1.vtysh_cmd("show bfd peers json"))
+        expected = [
+            {
+                "multihop": True,
+                "peer": "192.168.1.2",
+                "local": "10.0.0.1",
+                "vrf": "default",
+                "minimum-ttl": 246,
+                "status": "down",
+                "diagnostic": "ok",
+                "remote-diagnostic": "ok",
+                "type": "dynamic",
+            }
+        ]
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bfd_session)
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "Can't see BFD session created"
+
+
+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))