tests: Add a test case for `sender-as-path-loop-detection`

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>

8 files changed, 199 insertions, 0 deletions

diff --git a/tests/topotests/bgp_sender-as-path-loop-detection/__init__.py b/tests/topotests/bgp_sender-as-path-loop-detection/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/topotests/bgp_sender-as-path-loop-detection/__init__.py
diff --git a/tests/topotests/bgp_sender-as-path-loop-detection/r1/bgpd.conf b/tests/topotests/bgp_sender-as-path-loop-detection/r1/bgpd.conf
new file mode 100644
index 0000000000..a91b564bff
--- /dev/null
+++ b/tests/topotests/bgp_sender-as-path-loop-detection/r1/bgpd.conf
@@ -0,0 +1,12 @@
+! exit1
+router bgp 65001
+  neighbor 192.168.255.1 remote-as 65002
+  address-family ipv4 unicast
+    neighbor 192.168.255.1 route-map prepend out
+    redistribute connected
+  exit-address-family
+  !
+!
+route-map prepend permit 10
+  set as-path prepend 65003
+!
diff --git a/tests/topotests/bgp_sender-as-path-loop-detection/r1/zebra.conf b/tests/topotests/bgp_sender-as-path-loop-detection/r1/zebra.conf
new file mode 100644
index 0000000000..9904bb4e16
--- /dev/null
+++ b/tests/topotests/bgp_sender-as-path-loop-detection/r1/zebra.conf
@@ -0,0 +1,9 @@
+! exit1
+interface lo
+ ip address 172.16.255.254/32
+!
+interface r1-eth0
+ ip address 192.168.255.2/30
+!
+ip forwarding
+!
diff --git a/tests/topotests/bgp_sender-as-path-loop-detection/r2/bgpd.conf b/tests/topotests/bgp_sender-as-path-loop-detection/r2/bgpd.conf
new file mode 100644
index 0000000000..6e8e89360f
--- /dev/null
+++ b/tests/topotests/bgp_sender-as-path-loop-detection/r2/bgpd.conf
@@ -0,0 +1,8 @@
+! spine
+router bgp 65002
+  neighbor 192.168.255.2 remote-as 65001
+  neighbor 192.168.255.2 solo
+  neighbor 192.168.254.2 remote-as 65003
+  neighbor 192.168.254.2 solo
+  neighbor 192.168.254.2 sender-as-path-loop-detection
+!
diff --git a/tests/topotests/bgp_sender-as-path-loop-detection/r2/zebra.conf b/tests/topotests/bgp_sender-as-path-loop-detection/r2/zebra.conf
new file mode 100644
index 0000000000..f0d357c5ff
--- /dev/null
+++ b/tests/topotests/bgp_sender-as-path-loop-detection/r2/zebra.conf
@@ -0,0 +1,9 @@
+! spine
+interface r2-eth0
+ ip address 192.168.255.1/30
+!
+interface r2-eth1
+ ip address 192.168.254.1/30
+!
+ip forwarding
+!
diff --git a/tests/topotests/bgp_sender-as-path-loop-detection/r3/bgpd.conf b/tests/topotests/bgp_sender-as-path-loop-detection/r3/bgpd.conf
new file mode 100644
index 0000000000..8962befad2
--- /dev/null
+++ b/tests/topotests/bgp_sender-as-path-loop-detection/r3/bgpd.conf
@@ -0,0 +1,4 @@
+! exit2
+router bgp 65003
+  neighbor 192.168.254.1 remote-as 65002
+!
diff --git a/tests/topotests/bgp_sender-as-path-loop-detection/r3/zebra.conf b/tests/topotests/bgp_sender-as-path-loop-detection/r3/zebra.conf
new file mode 100644
index 0000000000..a10fe3a3c7
--- /dev/null
+++ b/tests/topotests/bgp_sender-as-path-loop-detection/r3/zebra.conf
@@ -0,0 +1,6 @@
+! exit2
+interface r3-eth0
+ ip address 192.168.254.2/30
+!
+ip forwarding
+!
diff --git a/tests/topotests/bgp_sender-as-path-loop-detection/test_bgp_sender-as-path-loop-detection.py b/tests/topotests/bgp_sender-as-path-loop-detection/test_bgp_sender-as-path-loop-detection.py
new file mode 100644
index 0000000000..708464864a
--- /dev/null
+++ b/tests/topotests/bgp_sender-as-path-loop-detection/test_bgp_sender-as-path-loop-detection.py
@@ -0,0 +1,151 @@
+#!/usr/bin/env python
+
+#
+# test_bgp_sender-as-path-loop-detection.py
+# Part of NetDEF Topology Tests
+#
+# Copyright (c) 2019 by
+# Donatas Abraitis <donatas.abraitis@gmail.com>
+#
+# Permission to use, copy, modify, and/or distribute this software
+# for any purpose with or without fee is hereby granted, provided
+# that the above copyright notice and this permission notice appear
+# in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+#
+
+"""
+Test if neighbor <neighbor> sender-as-path-loop-detection
+command works as expeced.
+"""
+
+import os
+import sys
+import json
+import time
+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.topolog import logger
+from mininet.topo import Topo
+
+class TemplateTopo(Topo):
+    def build(self, *_args, **_opts):
+        tgen = get_topogen(self)
+
+        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['r2'])
+        switch.add_link(tgen.gears['r3'])
+
+def setup_module(mod):
+    tgen = Topogen(TemplateTopo, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for i, (rname, router) in enumerate(router_list.iteritems(), 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_sender_as_path_loop_detection():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    router = tgen.gears['r2']
+
+    def _bgp_converge(router):
+        output = json.loads(router.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json"))
+        expected = {
+            '192.168.255.2': {
+                'bgpState': 'Established',
+                'addressFamilyInfo': {
+                    'ipv4Unicast': {
+                        'acceptedPrefixCounter': 2
+                    }
+                }
+            }
+        }
+        return topotest.json_cmp(output, expected)
+
+    def _bgp_has_route_from_r1(router):
+        output = json.loads(router.vtysh_cmd("show ip bgp 172.16.255.254/32 json"))
+        expected = {
+            'paths': [
+                {
+                    'aspath': {
+                        'segments': [
+                            {
+                                'type': 'as-sequence',
+                                'list': [
+                                    65001,
+                                    65003
+                                ]
+                            }
+                        ],
+                        'length': 2
+                    }
+                }
+            ]
+        }
+        return topotest.json_cmp(output, expected)
+
+    def _bgp_suppress_route_to_r3(router):
+        output = json.loads(router.vtysh_cmd("show ip bgp neighbor 192.168.254.2 advertised-routes json"))
+        expected = {
+            'totalPrefixCounter': 0
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_converge, router)
+    success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+
+    assert result is None, 'Failed bgp convergence in "{}"'.format(router)
+
+    test_func = functools.partial(_bgp_has_route_from_r1, router)
+    success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+
+    assert result is None, 'Failed to see a route from r1 in "{}"'.format(router)
+
+    test_func = functools.partial(_bgp_suppress_route_to_r3, router)
+    success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+
+    assert result is None, 'Route 172.16.255.254/32 should not be sent to r3 "{}"'.format(router)
+
+if __name__ == '__main__':
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))