tests: Check if we are sending IPV6 GUA for route-server-client peers

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

tests/topotests/bgp_route_server_client/r1/bgpd.conf

@@ -0,0 +1,10 @@
+!
+router bgp 65001
+ bgp router-id 10.10.10.1
+ no bgp ebgp-requires-policy
+ neighbor 2001:db8:1::1 remote-as external
+ address-family ipv6 unicast
+  redistribute connected
+  neighbor 2001:db8:1::1 activate
+ exit-address-family
+!

tests/topotests/bgp_route_server_client/r1/zebra.conf

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+!
+int lo
+ ipv6 address 2001:db8:f::1/128
+!
+int r1-eth0
+ ipv6 address 2001:db8:1::2/64
+!

tests/topotests/bgp_route_server_client/r2/bgpd.conf

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+router bgp 65000 view RS
+ bgp router-id 10.10.10.2
+ no bgp ebgp-requires-policy
+ neighbor 2001:db8:1::2 remote-as external
+ neighbor 2001:db8:3::2 remote-as external
+ address-family ipv6 unicast
+  redistribute connected
+  neighbor 2001:db8:1::2 activate
+  neighbor 2001:db8:3::2 activate
+  neighbor 2001:db8:1::2 route-server-client
+  neighbor 2001:db8:3::2 route-server-client
+ exit-address-family
+!

tests/topotests/bgp_route_server_client/r2/zebra.conf

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+!
+int r2-eth0
+ ipv6 address 2001:db8:1::1/64
+!
+int r2-eth1
+ ipv6 address 2001:db8:3::1/64
+!

tests/topotests/bgp_route_server_client/r3/bgpd.conf

@@ -0,0 +1,10 @@
+!
+router bgp 65003
+ bgp router-id 10.10.10.3
+ no bgp ebgp-requires-policy
+ neighbor 2001:db8:3::1 remote-as external
+ address-family ipv6 unicast
+  redistribute connected
+  neighbor 2001:db8:3::1 activate
+ exit-address-family
+!

tests/topotests/bgp_route_server_client/r3/zebra.conf

@@ -0,0 +1,7 @@
+!
+int lo
+ ipv6 address 2001:db8:f::3/128
+!
+int r3-eth0
+ ipv6 address 2001:db8:3::2/64
+!

tests/topotests/bgp_route_server_client/test_bgp_route_server_client.py

@@ -0,0 +1,134 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2021 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 we send ONLY GUA address for route-server-client peers.
+"""
+
+import os
+import sys
+import json
+import pytest
+import functools
+
+pytestmark = pytest.mark.bgpd
+
+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
+
+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["r2"])
+    switch.add_link(tgen.gears["r3"])
+
+
+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_route_server_client():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+    r2 = tgen.gears["r2"]
+
+    def _bgp_converge(router):
+        output = json.loads(router.vtysh_cmd("show bgp 2001:db8:f::3/128 json"))
+        expected = {
+            "prefix": "2001:db8:f::3/128",
+            "paths": [{"nexthops": [{"ip": "2001:db8:3::2"}]}],
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_converge, r1)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Cannot see BGP GUA next hop from r3 in r1"
+
+    def _bgp_single_next_hop(router):
+        output = json.loads(router.vtysh_cmd("show bgp 2001:db8:f::3/128 json"))
+        return len(output["paths"][0]["nexthops"])
+
+    assert (
+        _bgp_single_next_hop(r1) == 1
+    ), "Not ONLY one Next Hop received for 2001:db8:f::3/128"
+
+    def _bgp_gua_lla_next_hop(router):
+        output = json.loads(router.vtysh_cmd("show bgp view RS 2001:db8:f::3/128 json"))
+        expected = {
+            "prefix": "2001:db8:f::3/128",
+            "paths": [
+                {
+                    "nexthops": [
+                        {
+                            "ip": "2001:db8:3::2",
+                            "hostname": "r3",
+                            "afi": "ipv6",
+                            "scope": "global",
+                        },
+                        {"hostname": "r3", "afi": "ipv6", "scope": "link-local"},
+                    ]
+                }
+            ],
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_gua_lla_next_hop, r2)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Cannot see BGP LLA next hop from r3 in r2"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))