tests: Check if we can override IPv6 next-hop for VPN networks in route-map

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

tests/topotests/bgp_vpn_5549_route_map/cpe1/bgpd.conf

@@ -0,0 +1,9 @@
+router bgp 65000
+ 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 unicast
+  redistribute connected
+ exit-address-family
+!

tests/topotests/bgp_vpn_5549_route_map/cpe1/zebra.conf

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+!
+interface lo
+ ip address 172.16.255.1/32
+!
+interface cpe1-eth0
+ ip address 192.168.1.1/24
+!
+ip forwarding
+!

tests/topotests/bgp_vpn_5549_route_map/cpe2/bgpd.conf

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+router bgp 65000
+ no bgp ebgp-requires-policy
+ neighbor 192.168.2.2 remote-as external
+ neighbor 192.168.2.2 timers 1 3
+ neighbor 192.168.2.2 timers connect 1
+!

tests/topotests/bgp_vpn_5549_route_map/cpe2/zebra.conf

@@ -0,0 +1,6 @@
+!
+interface cpe2-eth0
+ ip address 192.168.2.1/24
+!
+ip forwarding
+!

tests/topotests/bgp_vpn_5549_route_map/pe1/bgpd.conf

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+router bgp 65001
+ bgp router-id 10.10.10.10
+ no bgp ebgp-requires-policy
+ no bgp default ipv4-unicast
+ neighbor 2001:db8:1::2 remote-as internal
+ neighbor 2001:db8:1::2 update-source 2001:db8:1::1
+ neighbor 2001:db8:1::2 timers 1 3
+ neighbor 2001:db8:1::2 timers connect 1
+ neighbor 2001:db8:1::2 capability extended-nexthop
+ address-family ipv4 vpn
+  neighbor 2001:db8:1::2 activate
+  neighbor 2001:db8:1::2 route-map pe2 out
+ exit-address-family
+!
+router bgp 65001 vrf RED
+ bgp router-id 192.168.1.2
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as external
+ neighbor 192.168.1.1 timers 1 3
+ neighbor 192.168.1.1 timers connect 1
+ address-family ipv4 unicast
+  label vpn export 1111
+  rd vpn export 192.168.1.2:2
+  rt vpn import 192.168.2.2:2 192.168.1.2:2
+  rt vpn export 192.168.1.2:2
+  export vpn
+  import vpn
+ exit-address-family
+!
+ip prefix-list cpe1 seq 5 permit 172.16.255.1/32
+!
+route-map pe2 permit 10
+ match ip address prefix-list cpe1
+ set ipv6 vpn next-hop 2001:db8::1
+!
+route-map pe2 permit 20
+exit
+!

tests/topotests/bgp_vpn_5549_route_map/pe1/ldpd.conf

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+mpls ldp
+ router-id 10.10.10.10
+ !
+ address-family ipv4
+  discovery transport-address 10.10.10.10
+  !
+  interface pe1-eth1
+  !
+ !
+!

tests/topotests/bgp_vpn_5549_route_map/pe1/ospf6d.conf

@@ -0,0 +1,12 @@
+!
+interface lo
+ ipv6 ospf6 area 0
+!
+interface pe1-eth1
+ ipv6 ospf6 area 0
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 dead-interval 3
+!
+router ospf6
+ ospf6 router-id 10.10.10.10
+!

tests/topotests/bgp_vpn_5549_route_map/pe1/zebra.conf

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+!
+interface lo
+ ip address 10.10.10.10/32
+ ipv6 address 2001:db8:1::1/128
+!
+interface pe1-eth0 vrf RED
+ ip address 192.168.1.2/24
+!
+interface pe1-eth1
+ ip address 10.0.1.1/24
+ ipv6 address 2001:db8::1/64
+!
+ip forwarding
+!

tests/topotests/bgp_vpn_5549_route_map/pe2/bgpd.conf

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+router bgp 65001
+ bgp router-id 10.10.10.20
+ no bgp ebgp-requires-policy
+ no bgp default ipv4-unicast
+ neighbor 2001:db8:1::1 remote-as internal
+ neighbor 2001:db8:1::1 update-source 2001:db8:1::2
+ neighbor 2001:db8:1::1 timers 1 3
+ neighbor 2001:db8:1::1 timers connect 1
+ neighbor 2001:db8:1::1 capability extended-nexthop
+ address-family ipv4 vpn
+  neighbor 2001:db8:1::1 activate
+ exit-address-family
+!
+router bgp 65001 vrf RED
+ bgp router-id 192.168.2.2
+ no bgp ebgp-requires-policy
+ neighbor 192.168.2.1 remote-as external
+ neighbor 192.168.2.1 timers 1 3
+ neighbor 192.168.2.1 timers connect 1
+ address-family ipv4 unicast
+  label vpn export 2222
+  rd vpn export 192.168.2.2:2
+  rt vpn import 192.168.2.2:2 192.168.1.2:2
+  rt vpn export 192.168.2.2:2
+  export vpn
+  import vpn
+ exit-address-family
+!
+

tests/topotests/bgp_vpn_5549_route_map/pe2/ldpd.conf

@@ -0,0 +1,10 @@
+mpls ldp
+ router-id 10.10.10.20
+ !
+ address-family ipv4
+  discovery transport-address 10.10.10.20
+  !
+  interface pe2-eth0
+  !
+ !
+!

tests/topotests/bgp_vpn_5549_route_map/pe2/ospf6d.conf

@@ -0,0 +1,12 @@
+!
+interface lo
+ ipv6 ospf6 area 0
+!
+interface pe2-eth0
+ ipv6 ospf6 area 0
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 dead-interval 3
+!
+router ospf6
+ ospf6 router-id 10.10.10.20
+!

tests/topotests/bgp_vpn_5549_route_map/pe2/zebra.conf

@@ -0,0 +1,14 @@
+!
+interface lo
+ ip address 10.10.10.20/32
+ ipv6 address 2001:db8:1::2/128
+!
+interface pe2-eth1 vrf RED
+ ip address 192.168.2.2/24
+!
+interface pe2-eth0
+ ip address 10.0.1.2/24
+ ipv6 address 2001:db8::2/64
+!
+ip forwarding
+!

tests/topotests/bgp_vpn_5549_route_map/test_bgp_vpn_5549_route_map.py

@@ -0,0 +1,138 @@
+#!/usr/bin/env python
+
+#
+# Copyright (c) 2022 by
+# Donatas Abraitis <donatas@opensourcerouting.org>
+#
+# 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.
+#
+
+"""
+Check if we can override VPN underlay next-hop from PE1 to PE2.
+"""
+
+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):
+    tgen.add_router("cpe1")
+    tgen.add_router("cpe2")
+    tgen.add_router("pe1")
+    tgen.add_router("pe2")
+
+    switch = tgen.add_switch("s1")
+    switch.add_link(tgen.gears["cpe1"])
+    switch.add_link(tgen.gears["pe1"])
+
+    switch = tgen.add_switch("s2")
+    switch.add_link(tgen.gears["pe1"])
+    switch.add_link(tgen.gears["pe2"])
+
+    switch = tgen.add_switch("s3")
+    switch.add_link(tgen.gears["pe2"])
+    switch.add_link(tgen.gears["cpe2"])
+
+
+def setup_module(mod):
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+
+    pe1 = tgen.gears["pe1"]
+    pe2 = tgen.gears["pe2"]
+
+    pe1.run("ip link add RED type vrf table 1001")
+    pe1.run("ip link set up dev RED")
+    pe2.run("ip link add RED type vrf table 1001")
+    pe2.run("ip link set up dev RED")
+    pe1.run("ip link set pe1-eth0 master RED")
+    pe2.run("ip link set pe2-eth1 master RED")
+
+    pe1.run("sysctl -w net.ipv4.ip_forward=1")
+    pe2.run("sysctl -w net.ipv4.ip_forward=1")
+    pe1.run("sysctl -w net.mpls.conf.pe1-eth0.input=1")
+    pe2.run("sysctl -w net.mpls.conf.pe2-eth1.input=1")
+
+    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))
+        )
+        router.load_config(
+            TopoRouter.RD_OSPF6, os.path.join(CWD, "{}/ospf6d.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_LDP, os.path.join(CWD, "{}/ldpd.conf".format(rname))
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_vpn_5549():
+    tgen = get_topogen()
+
+    pe2 = tgen.gears["pe2"]
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    def _bgp_vpn_nexthop_changed():
+        output = json.loads(pe2.vtysh_cmd("show bgp ipv4 vpn json"))
+        expected = {
+            "routes": {
+                "routeDistinguishers": {
+                    "192.168.1.2:2": {
+                        "172.16.255.1/32": [
+                            {"valid": True, "nexthops": [{"ip": "2001:db8::1"}]}
+                        ],
+                        "192.168.1.0/24": [
+                            {"valid": True, "nexthops": [{"ip": "2001:db8:1::1"}]}
+                        ],
+                    }
+                }
+            }
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_vpn_nexthop_changed)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed overriding IPv6 next-hop for VPN underlay"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))