--- /dev/null
+#!/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"
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