topotests: add bgp_large_comm_list_match test

Add a topotest to check for proper functioning of the
bgp large community list match operation under a route-map.

Signed-off-by: Philippe Guibert <[email protected]>

tests/topotests/bgp_large_comm_list_match/r1/bgpd.conf

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+!
+router bgp 65001
+ no bgp ebgp-requires-policy
+ neighbor 192.168.0.2 remote-as external
+ neighbor 192.168.0.2 timers 1 3
+ neighbor 192.168.0.2 timers connect 1
+ address-family ipv4
+  redistribute connected
+  neighbor 192.168.0.2 route-map r2 out
+ exit-address-family
+!
+ip prefix-list p1 seq 5 permit 172.16.255.1/32
+ip prefix-list p3 seq 5 permit 172.16.255.3/32
+ip prefix-list p4 seq 5 permit 172.16.255.4/32
+!
+route-map r2 permit 10
+ match ip address prefix-list p1
+ set large-community 65001:1:1 65001:2:1
+route-map r2 permit 20
+ match ip address prefix-list p3
+ set large-community 65001:3:1
+route-map r2 permit 30
+ match ip address prefix-list p4
+ set large-community 65001:10:1 65001:12:1 65001:13:1
+exit
+route-map r2 permit 40
+exit
+!

tests/topotests/bgp_large_comm_list_match/r1/zebra.conf

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+!
+interface lo
+ ip address 172.16.255.1/32
+ ip address 172.16.255.2/32
+ ip address 172.16.255.3/32
+ ip address 172.16.255.4/32
+!
+interface r1-eth0
+ ip address 192.168.0.1/24
+!
+ip forwarding
+!

tests/topotests/bgp_large_comm_list_match/r2/bgpd.conf

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+!
+!debug bgp updates
+!
+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 192.168.0.1 remote-as external
+ neighbor 192.168.0.1 timers 1 3
+ neighbor 192.168.0.1 timers connect 1
+ neighbor 192.168.1.3 remote-as external
+ neighbor 192.168.1.3 timers 1 3
+ neighbor 192.168.1.3 timers connect 1
+ address-family ipv4
+  neighbor 192.168.0.1 route-map r1 in
+  neighbor 192.168.0.1 soft-reconfiguration inbound
+ exit-address-family
+!
+bgp large-community-list 1 seq 5 permit 65001:1:1 65001:2:1
+bgp large-community-list 1 seq 10 permit 65001:3:1
+!
+route-map r1 deny 10
+ match large-community 1
+route-map r1 permit 20
+exit
+!

tests/topotests/bgp_large_comm_list_match/r2/zebra.conf

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+!
+interface r2-eth0
+ ip address 192.168.0.2/24
+!
+interface r2-eth1
+ ip address 192.168.1.2/24
+!
+ip forwarding
+!

tests/topotests/bgp_large_comm_list_match/r3/bgpd.conf

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+!
+!debug bgp updates
+!
+router bgp 65003
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.2 remote-as external
+ neighbor 192.168.1.2 timers 1 3
+ neighbor 192.168.1.2 timers connect 1
+ address-family ipv4
+  neighbor 192.168.1.2 route-map r1 in
+  neighbor 192.168.1.2 soft-reconfiguration inbound
+ exit-address-family
+!
+bgp large-community-list 2 seq 10 permit 65001:12:1
+!
+route-map r1 deny 10
+ match large-community 2 any
+exit
+route-map r1 permit 20
+exit
+!

tests/topotests/bgp_large_comm_list_match/r3/zebra.conf

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+!
+interface r3-eth0
+ ip address 192.168.1.3/24
+!
+ip forwarding
+!

tests/topotests/bgp_large_comm_list_match/test_bgp_large_comm_list_match.py

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+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+#
+# Copyright 2023 by 6WIND S.A.
+#
+
+"""
+Check if BGP large-community-list works as OR if multiple large-community entries specified,
+like:
+
+bgp large-community-list 1 seq 5 permit 65001:1:1 65002:2:1
+bgp large-community-list 1 seq 10 permit 65001:3:1
+!
+route-map test deny 10
+ match community 1
+route-map test permit 20
+
+Here, we should deny routes in/out if the path has:
+(65001:1:1 OR 65001:2:1) OR 65001:3:1.
+"""
+
+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, TopoRouter, get_topogen
+from lib.common_config import step
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def build_topo(tgen):
+    for routern in range(1, 4):
+        tgen.add_router("r{}".format(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["r3"])
+    switch.add_link(tgen.gears["r2"])
+
+
+def setup_module(mod):
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for i, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_config(
+            TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_large_comm_list_match():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    router = tgen.gears["r2"]
+
+    def _bgp_converge():
+        output = json.loads(
+            router.vtysh_cmd(
+                "show bgp ipv4 unicast neighbors 192.168.0.1 filtered-routes json"
+            )
+        )
+        expected = {
+            "receivedRoutes": {
+                "172.16.255.1/32": {
+                    "path": "65001",
+                },
+                "172.16.255.3/32": {
+                    "path": "65001",
+                },
+            }
+        }
+        return topotest.json_cmp(output, expected)
+
+    step("Initial BGP converge between R1 and R2")
+    test_func = functools.partial(_bgp_converge)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert (
+        result is None
+    ), "Failed to filter BGP UPDATES with large-community-list on R2"
+
+
+def test_bgp_large_comm_list_match_any():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    router = tgen.gears["r3"]
+
+    def _bgp_converge():
+        output = json.loads(
+            router.vtysh_cmd(
+                "show bgp ipv4 unicast neighbors 192.168.1.2 filtered-routes json"
+            )
+        )
+        expected = {
+            "receivedRoutes": {
+                "172.16.255.4/32": {
+                    "path": "65002 65001",
+                },
+            }
+        }
+        return topotest.json_cmp(output, expected)
+
+    step("Initial BGP converge between R3 and R2")
+    test_func = functools.partial(_bgp_converge)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to filter BGP UPDATES with large-community-list on R3"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))