1 files changed, 587 insertions, 0 deletions
diff --git a/tests/topotests/bgp_l3vpn_label_export/test_bgp_l3vpn_label_export.py b/tests/topotests/bgp_l3vpn_label_export/test_bgp_l3vpn_label_export.py
new file mode 100644
index 0000000..7c23a3e
--- /dev/null
+++ b/tests/topotests/bgp_l3vpn_label_export/test_bgp_l3vpn_label_export.py
@@ -0,0 +1,587 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+#
+# Copyright (c) 2023 by Louis Scalbert <louis.scalbert@6wind.com>
+# Copyright 2023 6WIND S.A.
+#
+
+"""
+
+"""
+
+import os
+import re
+import sys
+import json
+import pytest
+import functools
+
+from copy import deepcopy
+
+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 kill_router_daemons, start_router_daemons, step
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def build_topo(tgen):
+    for rtr in [1, 2]:
+        tgen.add_router("r{}".format(rtr))
+
+    switch = tgen.add_switch("s1")
+    switch.add_link(tgen.gears["r1"])
+    switch.add_link(tgen.gears["r2"])
+
+
+def setup_module(mod):
+    tgen = Topogen(build_topo, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for rtr in [1, 2]:
+        tgen.gears["r{}".format(rtr)].cmd("ip link add vrf1 type vrf table 10")
+        tgen.gears["r{}".format(rtr)].cmd("ip link set vrf1 up")
+        tgen.gears["r{}".format(rtr)].cmd(
+            "ip address add dev vrf1 192.0.3.{}/32".format(rtr)
+        )
+        tgen.gears["r{}".format(rtr)].run(
+            "sysctl -w net.mpls.conf.r{}-eth0.input=1".format(rtr)
+        )
+        tgen.gears["r{}".format(rtr)].run("sysctl -w net.mpls.conf.vrf1.input=1")
+
+    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_STATIC, os.path.join(CWD, "{}/staticd.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.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 check_bgp_vpn_prefix(label, rname="r1", rd=None):
+    tgen = get_topogen()
+
+    if rd:
+        output = json.loads(
+            tgen.gears[rname].vtysh_cmd(
+                "show bgp ipv4 vpn rd {} 192.0.3.2/32 json".format(rd)
+            )
+        )
+    else:
+        output = json.loads(
+            tgen.gears[rname].vtysh_cmd(
+                "show bgp vrf vrf1 ipv4 unicast 192.0.3.2/32 json"
+            )
+        )
+
+    if label == "auto":
+        expected = {
+            "paths": [
+                {
+                    "valid": True,
+                    "aspath": {"string": "65002"},
+                    "nexthops": [{"ip": "192.0.2.2"}],
+                },
+            ]
+        }
+    elif label and not rd:
+        expected = {
+            "paths": [
+                {
+                    "valid": True,
+                    "remoteLabel": label,
+                    "aspath": {"string": "65002"},
+                    "nexthops": [{"ip": "192.0.2.2"}],
+                },
+            ]
+        }
+    elif label and rd:
+        expected = {
+            "102:1": {
+                "prefix": "192.0.3.2/32",
+                "paths": [
+                    {
+                        "valid": True,
+                        "remoteLabel": label,
+                        "nexthops": [{"ip": "0.0.0.0"}],
+                    }
+                ],
+            }
+        }
+    else:
+        expected = {}
+
+    return topotest.json_cmp(output, expected, exact=(label is None))
+
+
+def check_mpls_table(label, protocol):
+    tgen = get_topogen()
+
+    if label == "auto":
+        cmd = "show mpls table json"
+    else:
+        cmd = "show mpls table {} json".format(label)
+
+    output = json.loads(tgen.gears["r2"].vtysh_cmd(cmd))
+
+    if label == "auto" and protocol:
+        output_copy = deepcopy(output)
+        for key, data in output_copy.items():
+            for nexthop in data.get("nexthops", []):
+                if nexthop.get("type", None) != protocol:
+                    continue
+                output = data
+                break
+
+    if protocol:
+        expected = {
+            "nexthops": [
+                {
+                    "type": protocol,
+                },
+            ]
+        }
+    else:
+        expected = {}
+
+    return topotest.json_cmp(output, expected, exact=(protocol is None))
+
+
+def check_mpls_ldp_binding():
+    tgen = get_topogen()
+
+    output = json.loads(
+        tgen.gears["r1"].vtysh_cmd("show mpls ldp binding 192.0.2.2/32 json")
+    )
+    expected = {
+        "bindings": [
+            {
+                "prefix": "192.0.2.2/32",
+                "localLabel": "16",  # first available label
+                "inUse": 1,
+            },
+        ]
+    }
+
+    return topotest.json_cmp(output, expected)
+
+
+def test_convergence():
+    "Test protocol convergence"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    step("Check BGP and LDP convergence")
+    test_func = functools.partial(check_bgp_vpn_prefix, 2222)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see BGP prefix on R1"
+
+    test_func = functools.partial(check_mpls_ldp_binding)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP binding on R2"
+
+    test_func = functools.partial(check_mpls_table, 16, "LDP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP label on R2"
+
+    test_func = functools.partial(check_mpls_table, 2222, "BGP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see BGP label on R2"
+
+    output = tgen.net["r2"].cmd("vtysh -c 'show debugging label-table' | grep Proto")
+    assert re.match(
+        r"Proto ldp: \[16/(1[7-9]|[2-9]\d+|\d{3,})\]", output
+    ), "Failed to see LDP label chunk"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: [2222/2222]" in output, "Failed to see BGP label chunk"
+
+
+def test_vpn_label_export_16():
+    "Test that assigning the label value of 16 is not possible because it used by LDP"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "label vpn export 16"
+    )
+
+    step("Check that label vpn export 16 fails")
+    test_func = functools.partial(check_bgp_vpn_prefix, None)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Unexpected BGP prefix on R1"
+
+    test_func = functools.partial(check_mpls_ldp_binding)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP binding on R2"
+
+    test_func = functools.partial(check_mpls_table, 16, "LDP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP label on R2"
+
+    test_func = functools.partial(check_mpls_table, 2222, None)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Unexpected BGP label on R2"
+
+    output = tgen.net["r2"].cmd("vtysh -c 'show debugging label-table' | grep Proto")
+    assert re.match(
+        r"Proto ldp: \[16/(1[7-9]|[2-9]\d+|\d{3,})\]", output
+    ), "Failed to see LDP label chunk"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp" not in output, "Unexpected BGP label chunk"
+
+
+def test_vpn_label_export_2222():
+    "Test that setting back the label value of 2222 works"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "label vpn export 2222"
+    )
+
+    step("Check that label vpn export 2222 is OK")
+    test_func = functools.partial(check_bgp_vpn_prefix, 2222)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see BGP prefix on R1"
+
+    test_func = functools.partial(check_mpls_ldp_binding)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP binding on R2"
+
+    test_func = functools.partial(check_mpls_table, 16, "LDP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP label on R2"
+
+    test_func = functools.partial(check_mpls_table, "auto", "BGP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Unexpected BGP label on R2"
+
+    output = tgen.net["r2"].cmd("vtysh -c 'show debugging label-table' | grep Proto")
+    assert re.match(
+        r"Proto ldp: \[16/(1[7-9]|[2-9]\d+|\d{3,})\]", output
+    ), "Failed to see LDP label chunk"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: [2222/2222]" in output, "Failed to see BGP label chunk"
+
+
+def test_vpn_label_export_auto():
+    "Test that setting label vpn export auto works"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "label vpn export auto"
+    )
+
+    step("Check that label vpn export auto is OK")
+    test_func = functools.partial(check_bgp_vpn_prefix, "auto")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see BGP prefix on R1"
+
+    test_func = functools.partial(check_mpls_ldp_binding)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP binding on R2"
+
+    test_func = functools.partial(check_mpls_table, 16, "LDP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP label on R2"
+
+    test_func = functools.partial(check_mpls_table, "auto", "BGP")
+    _, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
+    assert result is None, "Failed to see BGP label on R2"
+
+    output = tgen.net["r2"].cmd("vtysh -c 'show debugging label-table' | grep Proto")
+    assert re.match(
+        r"Proto ldp: \[16/(1[7-9]|[2-9]\d+|\d{3,})\]", output
+    ), "Failed to see LDP label chunk"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: " in output, "Failed to see BGP label chunk"
+
+
+def test_vpn_label_export_no_auto():
+    "Test that UNsetting label vpn export auto removes the prefix from R1 table and R2 LDP table"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    output = json.loads(
+        tgen.gears["r1"].vtysh_cmd("show bgp vrf vrf1 ipv4 unicast 192.0.3.2/32 json")
+    )
+
+    auto_label = output.get("paths")[0].get("remoteLabel", None)
+    assert auto_label is not None, "Failed to fetch prefix label on R1"
+
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "no label vpn export auto"
+    )
+
+    step("Check that no label vpn export auto is OK")
+    test_func = functools.partial(check_bgp_vpn_prefix, 3, rname="r2", rd="102:1")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Unexpected BGP prefix on R2"
+
+    test_func = functools.partial(check_mpls_ldp_binding)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP binding on R2"
+
+    test_func = functools.partial(check_mpls_table, 16, "LDP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP label on R2"
+
+    test_func = functools.partial(check_mpls_table, auto_label, None)
+    _, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
+    assert result is None, "Unexpected BGP label on R2"
+
+    output = tgen.net["r2"].cmd("vtysh -c 'show debugging label-table' | grep Proto")
+    assert re.match(
+        r"Proto ldp: \[16/(1[7-9]|[2-9]\d+|\d{3,})\]", output
+    ), "Failed to see LDP label chunk"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: " not in output, "Unexpected BGP label chunk"
+
+
+def test_vpn_label_export_auto_back():
+    "Test that setting back label vpn export auto works"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    output = json.loads(
+        tgen.gears["r2"].vtysh_cmd("show bgp vrf vrf1 ipv4 unicast 192.0.3.2/32 json")
+    )
+
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "label vpn export auto"
+    )
+
+    step("Check that label vpn export auto is OK")
+    test_func = functools.partial(check_bgp_vpn_prefix, "auto")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see BGP prefix on R1"
+
+    test_func = functools.partial(check_mpls_ldp_binding)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP binding on R2"
+
+    test_func = functools.partial(check_mpls_table, 16, "LDP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP label on R2"
+
+    test_func = functools.partial(check_mpls_table, "auto", "BGP")
+    _, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
+    assert result is None, "Failed to see BGP label on R2"
+
+    output = tgen.net["r2"].cmd("vtysh -c 'show debugging label-table' | grep Proto")
+    assert re.match(
+        r"Proto ldp: \[16/(1[7-9]|[2-9]\d+|\d{3,})\]", output
+    ), "Failed to see LDP label chunk"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: " in output, "Failed to see BGP label chunk"
+
+
+def test_vpn_label_export_manual_from_auto():
+    "Test that setting a manual label value from the BGP chunk range works"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    output = json.loads(
+        tgen.gears["r1"].vtysh_cmd("show bgp vrf vrf1 ipv4 unicast 192.0.3.2/32 json")
+    )
+
+    auto_label = output.get("paths")[0].get("remoteLabel", None)
+    assert auto_label is not None, "Failed to fetch prefix label on R1"
+
+    auto_label = auto_label + 1
+
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "label vpn export {}".format(auto_label)
+    )
+
+    step("Check that label vpn export {} is OK".format(auto_label))
+    test_func = functools.partial(
+        check_bgp_vpn_prefix, auto_label, rname="r2", rd="102:1"
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see BGP prefix on R2"
+
+    test_func = functools.partial(check_mpls_ldp_binding)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP binding on R2"
+
+    test_func = functools.partial(check_mpls_table, 16, "LDP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP label on R2"
+
+    test_func = functools.partial(check_mpls_table, auto_label, "BGP")
+    _, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
+    assert result is None, "Failed to see BGP label on R2"
+
+    output = tgen.net["r2"].cmd("vtysh -c 'show debugging label-table' | grep Proto")
+    assert re.match(
+        r"Proto ldp: \[16/(1[7-9]|[2-9]\d+|\d{3,})\]", output
+    ), "Failed to see LDP label chunk"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: " in output, "Failed to see BGP label chunk"
+
+
+def test_vpn_label_configure_dynamic_range():
+    "Test that if a dynamic range is configured, then the next dynamic allocations will be done in that block"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+    tgen.gears["r2"].vtysh_cmd("conf\n" "mpls label dynamic-block 500 1000\n")
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "label vpn export auto"
+    )
+    step("Check that label vpn export auto starting at 500 is OK")
+    test_func = functools.partial(check_bgp_vpn_prefix, 500, rname="r2", rd="102:1")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Unexpected BGP prefix on R2"
+
+    test_func = functools.partial(check_mpls_table, 500, "BGP")
+    _, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
+    assert result is None, "Unexpected BGP label on R2"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: " in output, "Failed to see BGP label chunk"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))
+
+
+def test_vpn_label_restart_ldp():
+    "Test that if a dynamic range is configured, then when LDP restarts, it follows the new dynamic range"
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    router_list = tgen.routers()
+
+    step("Kill LDP on R2")
+    kill_router_daemons(tgen, "r2", ["ldpd"])
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto ldp: " not in output, "Unexpected LDP label chunk"
+
+    step("Bring up LDP on R2")
+
+    start_router_daemons(tgen, "r2", ["ldpd"])
+
+    test_func = functools.partial(check_mpls_table, 628, "LDP")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Failed to see LDP label on R2"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto ldp: [628/691]" in output, "Failed to see LDP label chunk [628/691]"
+    assert "Proto ldp: [692/755]" in output, "Failed to see LDP label chunk [692/755]"
+
+
+def test_vpn_label_unconfigure_dynamic_range():
+    "Test that if the dynamic range is unconfigured, then the next dynamic allocations will be done at the first free place."
+
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+    tgen.gears["r2"].vtysh_cmd("conf\n" "no mpls label dynamic-block 500 1000\n")
+    step("Check that unconfiguring label vpn export auto will remove BGP label chunk")
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "no label vpn export auto"
+    )
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: " not in output, "Unexpected BGP label chunk"
+
+    tgen.gears["r2"].vtysh_cmd(
+        "conf\n"
+        "router bgp 65002 vrf vrf1\n"
+        "address-family ipv4 unicast\n"
+        "label vpn export auto"
+    )
+    step("Check that label vpn export auto starting at 16 is OK")
+    test_func = functools.partial(check_bgp_vpn_prefix, 16, rname="r2", rd="102:1")
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "Unexpected BGP prefix on R2"
+
+    test_func = functools.partial(check_mpls_table, 16, "BGP")
+    _, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
+    assert result is None, "Unexpected BGP label on R2"
+
+    output = tgen.gears["r2"].vtysh_cmd("show debugging label-table")
+    assert "Proto bgp: " in output, "Failed to see BGP label chunk"