535 lines
20 KiB
Python
535 lines
20 KiB
Python
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#!/usr/bin/env python
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# test_nhrp_redundancy.py
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#
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# Copyright 2024, LabN Consulting, L.L.C.
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# Dave LeRoy
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#
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import os
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import sys
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import json
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from functools import partial
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import pytest
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# pylint: disable=C0413
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# Import topogen and topotest helpers
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from lib import topotest
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from lib.topogen import Topogen, TopoRouter, get_topogen
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from lib.topolog import logger
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from lib.common_config import (
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required_linux_kernel_version,
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shutdown_bringup_interface,
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retry,
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)
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"""
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test_nhrp_redundancy.py: Test NHS redundancy for NHRP
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"""
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TOPOLOGY = """
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+------------+ +------------+ +------------+
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| NHS 1 | | NHS 2 | | NHS 3 |
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+-----+------+ +-----+------+ +-----+------+
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|.1 |.2 |.3
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| | |
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| | 192.168.1.0/24 |
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------+-------------------------------+------------------+-------------+------
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|.6
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GRE P2MP between all NHS and NHC +-----+------+
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172.16.1.x/32 | |
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| Router |
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+-----+------+
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---------+----------------+-------------+------
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| 192.168.2.0/24 |
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| |.4 |.5
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+------------+ | +-------+----+ +------+-----+ |
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| | | | | | | |
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| | +--------+ | | | |
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| Host |.7 | | NHC 1 | | NHC 2 +-----+10.5.5.0/24
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| +---------+ | | | | |
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+------------+ | +------------+ +------------+ |
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10.4.4.0/24
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"""
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# Save the Current Working Directory to find configuration files.
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CWD = os.path.dirname(os.path.realpath(__file__))
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sys.path.append(os.path.join(CWD, "../"))
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# Required to instantiate the topology builder class.
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pytestmark = [pytest.mark.nhrpd]
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def build_topo(tgen):
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"Build function"
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# Create 7 routers
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for rname in ["nhs1", "nhs2", "nhs3", "nhc1", "nhc2", "router", "host"]:
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tgen.add_router(rname)
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switch = tgen.add_switch("s1")
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switch.add_link(tgen.gears["nhs1"])
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switch.add_link(tgen.gears["nhs2"])
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switch.add_link(tgen.gears["nhs3"])
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switch.add_link(tgen.gears["router"])
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switch = tgen.add_switch("s2")
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switch.add_link(tgen.gears["nhc1"])
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switch.add_link(tgen.gears["nhc2"])
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switch.add_link(tgen.gears["router"])
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switch = tgen.add_switch("s3")
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switch.add_link(tgen.gears["nhc1"])
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switch.add_link(tgen.gears["host"])
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switch = tgen.add_switch("s4")
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switch.add_link(tgen.gears["nhc2"])
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def _populate_iface():
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tgen = get_topogen()
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cmds_tot_hub = [
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"ip tunnel add {0}-gre0 mode gre ttl 64 key 42 dev {0}-eth0 local 192.168.1.{1} remote 0.0.0.0",
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"ip link set dev {0}-gre0 up",
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"echo 0 > /proc/sys/net/ipv4/ip_forward_use_pmtu",
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"echo 1 > /proc/sys/net/ipv6/conf/{0}-eth0/disable_ipv6",
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"echo 1 > /proc/sys/net/ipv6/conf/{0}-gre0/disable_ipv6",
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"iptables -A FORWARD -i {0}-gre0 -o {0}-gre0 -m hashlimit --hashlimit-upto 4/minute --hashlimit-burst 1 --hashlimit-mode srcip,dstip --hashlimit-srcmask 24 --hashlimit-dstmask 24 --hashlimit-name loglimit-0 -j NFLOG --nflog-group 1 --nflog-size 128",
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]
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cmds_tot = [
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"ip tunnel add {0}-gre0 mode gre ttl 64 key 42 dev {0}-eth0 local 192.168.2.{1} remote 0.0.0.0",
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"ip link set dev {0}-gre0 up",
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"echo 0 > /proc/sys/net/ipv4/ip_forward_use_pmtu",
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"echo 1 > /proc/sys/net/ipv6/conf/{0}-eth0/disable_ipv6",
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"echo 1 > /proc/sys/net/ipv6/conf/{0}-gre0/disable_ipv6",
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]
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for cmd in cmds_tot_hub:
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input = cmd.format("nhs1", "1")
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logger.info("input: " + input)
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output = tgen.net["nhs1"].cmd(input)
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logger.info("output: " + output)
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input = cmd.format("nhs2", "2")
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logger.info("input: " + input)
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output = tgen.net["nhs2"].cmd(input)
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logger.info("output: " + output)
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input = cmd.format("nhs3", "3")
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logger.info("input: " + input)
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output = tgen.net["nhs3"].cmd(input)
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logger.info("output: " + output)
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for cmd in cmds_tot:
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input = cmd.format("nhc1", "4")
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logger.info("input: " + input)
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output = tgen.net["nhc1"].cmd(input)
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logger.info("output: " + output)
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input = cmd.format("nhc2", "5")
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logger.info("input: " + input)
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output = tgen.net["nhc2"].cmd(input)
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logger.info("output: " + output)
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def _verify_iptables():
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tgen = get_topogen()
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# Verify iptables is installed. Required for shortcuts
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rc, _, _ = tgen.net["nhs1"].cmd_status("iptables")
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return False if rc == 127 else True
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def setup_module(mod):
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logger.info("NHRP Redundant NHS:\n {}".format(TOPOLOGY))
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result = required_linux_kernel_version("5.0")
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if result is not True:
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pytest.skip("Kernel requirements are not met")
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tgen = Topogen(build_topo, mod.__name__)
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tgen.start_topology()
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# Starting Routers
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router_list = tgen.routers()
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_populate_iface()
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for rname, router in router_list.items():
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router.load_config(
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TopoRouter.RD_ZEBRA,
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os.path.join(CWD, "{}/zebra.conf".format(rname)),
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)
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if rname in ("nhs1", "nhs2", "nhs3", "nhc1", "nhc2"):
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router.load_config(
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TopoRouter.RD_NHRP, os.path.join(CWD, "{}/nhrpd.conf".format(rname))
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)
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# Initialize all routers.
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tgen.start_router()
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def teardown_module(_mod):
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"Teardown the pytest environment"
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tgen = get_topogen()
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tgen.stop_topology()
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def test_protocols_convergence():
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"""
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Assert that all protocols have converged before checking for the NHRP
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statuses as they depend on it.
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"""
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tgen = get_topogen()
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Checking NHRP cache for convergence")
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router_list = tgen.routers()
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# Check NHRP cache on servers and clients
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for rname, router in router_list.items():
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if "nh" not in rname:
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continue
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json_file = "{}/{}/nhrp_cache.json".format(CWD, router.name)
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expected = json.loads(open(json_file).read())
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test_func = partial(
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topotest.router_json_cmp, router, "show ip nhrp cache json", expected
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)
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_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
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output = router.vtysh_cmd("show ip nhrp cache")
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logger.info(output)
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assertmsg = '"{}" JSON output mismatches'.format(router.name)
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assert result is None, assertmsg
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# Check NHRP IPV4 routes on servers and clients
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logger.info("Checking IPv4 routes for convergence")
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for rname, router in router_list.items():
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if "nh" not in rname:
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continue
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json_file = "{}/{}/nhrp_route.json".format(CWD, router.name)
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expected = json.loads(open(json_file).read())
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test_func = partial(
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topotest.router_json_cmp, router, "show ip route nhrp json", expected
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)
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_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
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output = router.vtysh_cmd("show ip route nhrp")
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logger.info(output)
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assertmsg = '"{}" JSON output mismatches'.format(router.name)
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assert result is None, assertmsg
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# Test connectivity from 1 NHRP server to all clients
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nhs1 = tgen.gears["nhs1"]
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logger.info("Check Ping IPv4 from nhs1 to nhc1 = 172.16.1.4)")
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output = nhs1.run("ping 172.16.1.4 -f -c 1000")
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logger.info(output)
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if "1000 packets transmitted, 1000 received" not in output:
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assertmsg = "expected ping IPv4 from nhs1 to nhc1 should be ok"
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assert 0, assertmsg
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else:
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logger.info("Check Ping IPv4 from nhs1 to nhc1 OK")
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logger.info("Check Ping IPv4 from nhs1 to nhc2 = 172.16.1.5)")
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output = nhs1.run("ping 172.16.1.5 -f -c 1000")
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logger.info(output)
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if "1000 packets transmitted, 1000 received" not in output:
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assertmsg = "expected ping IPv4 from nhs1 to nhc2 should be ok"
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assert 0, assertmsg
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else:
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logger.info("Check Ping IPv4 from nhs1 to nhc2 OK")
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# Test connectivity from 1 NHRP client to all servers
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nhc1 = tgen.gears["nhc1"]
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logger.info("Check Ping IPv4 from nhc1 to nhs1 = 172.16.1.1)")
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output = nhc1.run("ping 172.16.1.1 -f -c 1000")
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logger.info(output)
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if "1000 packets transmitted, 1000 received" not in output:
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assertmsg = "expected ping IPv4 from nhc1 to nhs1 should be ok"
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assert 0, assertmsg
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else:
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logger.info("Check Ping IPv4 from nhc1 to nhs1 OK")
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logger.info("Check Ping IPv4 from nhc1 to nhs2 = 172.16.1.2)")
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output = nhc1.run("ping 172.16.1.2 -f -c 1000")
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logger.info(output)
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if "1000 packets transmitted, 1000 received" not in output:
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assertmsg = "expected ping IPv4 from nhc1 to nhs2 should be ok"
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assert 0, assertmsg
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else:
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logger.info("Check Ping IPv4 from nhc1 to nhs2 OK")
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logger.info("Check Ping IPv4 from nhc1 to nhs3 = 172.16.1.3)")
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output = nhc1.run("ping 172.16.1.3 -f -c 1000")
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logger.info(output)
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if "1000 packets transmitted, 1000 received" not in output:
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assertmsg = "expected ping IPv4 from nhc1 to nhs3 should be ok"
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assert 0, assertmsg
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else:
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logger.info("Check Ping IPv4 from nhc1 to nhs3 OK")
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@retry(retry_timeout=30, initial_wait=5)
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def verify_shortcut_path():
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"""
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Verifying that traffic flows through shortcut path
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"""
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tgen = get_topogen()
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host = tgen.gears["host"]
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logger.info("Check Ping IPv4 from host to nhc2 = 10.5.5.5")
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output = host.run("ping 10.5.5.5 -f -c 1000")
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logger.info(output)
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if "1000 packets transmitted, 1000 received" not in output:
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assertmsg = "expected ping IPv4 from host to nhc2 should be ok"
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assert 0, assertmsg
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else:
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logger.info("Check Ping IPv4 from host to nhc2 OK")
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def test_redundancy_shortcut():
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"""
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Assert that if shortcut created and then NHS goes down, there is no traffic disruption
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"""
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tgen = get_topogen()
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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if not _verify_iptables():
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pytest.skip("iptables not installed")
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logger.info("Testing NHRP shortcuts with redundant servers")
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# Verify nhc1 nhrp routes before shortcut creation
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nhc1 = tgen.gears["nhc1"]
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json_file = "{}/{}/nhrp_route.json".format(CWD, nhc1.name)
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assertmsg = "No nhrp_route file found"
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assert os.path.isfile(json_file), assertmsg
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expected = json.loads(open(json_file).read())
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test_func = partial(
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topotest.router_json_cmp, nhc1, "show ip route nhrp json", expected
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)
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_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
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output = nhc1.vtysh_cmd("show ip route nhrp")
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logger.info(output)
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assertmsg = '"{}" JSON output mismatches'.format(nhc1.name)
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assert result is None, assertmsg
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# Initiate shortcut by pinging between clients
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host = tgen.gears["host"]
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logger.info("Check Ping IPv4 from host to nhc2 via shortcut = 10.5.5.5")
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output = host.run("ping 10.5.5.5 -f -c 1000")
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logger.info(output)
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if "1000 packets transmitted, 1000 received" not in output:
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assertmsg = "expected ping IPv4 from host to nhc2 via shortcut should be ok"
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assert 0, assertmsg
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else:
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logger.info("Check Ping IPv4 from host to nhc2 via shortcut OK")
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# Now check that NHRP shortcut route installed
|
||
|
|
json_file = "{}/{}/nhrp_route_shortcut.json".format(CWD, nhc1.name)
|
||
|
|
assertmsg = "No nhrp_route file found"
|
||
|
|
assert os.path.isfile(json_file), assertmsg
|
||
|
|
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, nhc1, "show ip route nhrp json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = nhc1.vtysh_cmd("show ip route nhrp")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
assertmsg = '"{}" JSON output mismatches'.format(nhc1.name)
|
||
|
|
assert result is None, assertmsg
|
||
|
|
|
||
|
|
json_file = "{}/{}/nhrp_shortcut_present.json".format(CWD, nhc1.name)
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, nhc1, "show ip nhrp shortcut json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = nhc1.vtysh_cmd("show ip nhrp shortcut")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
assertmsg = '"{}" JSON output mismatches'.format(nhc1.name)
|
||
|
|
assert result is None, assertmsg
|
||
|
|
|
||
|
|
# check the shortcut disappears because of no traffic
|
||
|
|
json_file = "{}/{}/nhrp_shortcut_absent.json".format(CWD, nhc1.name)
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, nhc1, "show ip nhrp shortcut json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = nhc1.vtysh_cmd("show ip nhrp shortcut")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
assertmsg = '"{}" JSON output mismatches'.format(nhc1.name)
|
||
|
|
assert result is None, assertmsg
|
||
|
|
|
||
|
|
|
||
|
|
def test_redundancy_shortcut_backup():
|
||
|
|
"""
|
||
|
|
Stop traffic and verify next time traffic started, shortcut is initiated by backup NHS
|
||
|
|
"""
|
||
|
|
tgen = get_topogen()
|
||
|
|
if tgen.routers_have_failure():
|
||
|
|
pytest.skip(tgen.errors)
|
||
|
|
|
||
|
|
if not _verify_iptables():
|
||
|
|
pytest.skip("iptables not installed")
|
||
|
|
|
||
|
|
nhc1 = tgen.gears["nhc1"]
|
||
|
|
router_list = tgen.routers()
|
||
|
|
|
||
|
|
# Bring down primary GRE interface and verify shortcut is not disturbed
|
||
|
|
logger.info("Bringing down nhs1, primary NHRP server.")
|
||
|
|
shutdown_bringup_interface(tgen, "nhs1", "nhs1-gre0", False)
|
||
|
|
|
||
|
|
# Check NHRP cache on servers and clients
|
||
|
|
for rname, router in router_list.items():
|
||
|
|
if "nh" not in rname:
|
||
|
|
continue
|
||
|
|
if "nhs1" in rname:
|
||
|
|
continue
|
||
|
|
|
||
|
|
json_file = "{}/{}/nhrp_cache_nhs1_down.json".format(CWD, router.name)
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, router, "show ip nhrp cache json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = router.vtysh_cmd("show ip nhrp cache")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
assertmsg = '"{}" JSON output mismatches'.format(router.name)
|
||
|
|
assert result is None, assertmsg
|
||
|
|
|
||
|
|
# Check NHRP IPV4 routes on servers and clients
|
||
|
|
logger.info("Checking IPv4 routes for convergence")
|
||
|
|
for rname, router in router_list.items():
|
||
|
|
if "nh" not in rname:
|
||
|
|
continue
|
||
|
|
if "nhs1" in rname:
|
||
|
|
continue
|
||
|
|
|
||
|
|
json_file = "{}/{}/nhrp_route_nhs1_down.json".format(CWD, router.name)
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, router, "show ip route nhrp json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = router.vtysh_cmd("show ip route nhrp")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
assertmsg = '"{}" JSON output mismatches'.format(router.name)
|
||
|
|
assert result is None, assertmsg
|
||
|
|
|
||
|
|
# Verify shortcut is still active
|
||
|
|
host = tgen.gears["host"]
|
||
|
|
logger.info("Check Ping IPv4 from host to nhc2 via shortcut = 10.5.5.5")
|
||
|
|
|
||
|
|
output = host.run("ping 10.5.5.5 -f -c 1000")
|
||
|
|
logger.info(output)
|
||
|
|
if "1000 packets transmitted, 1000 received" not in output:
|
||
|
|
assertmsg = "expected ping IPv4 from host to nhc2 via shortcut should be ok"
|
||
|
|
assert 0, assertmsg
|
||
|
|
else:
|
||
|
|
logger.info("Check Ping IPv4 from host to nhc2 via shortcut OK")
|
||
|
|
|
||
|
|
# Verify shortcut is present in routing table
|
||
|
|
json_file = "{}/{}/nhrp_route_shortcut_nhs1_down.json".format(CWD, nhc1.name)
|
||
|
|
assertmsg = "No nhrp_route file found"
|
||
|
|
assert os.path.isfile(json_file), assertmsg
|
||
|
|
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, nhc1, "show ip route nhrp json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = nhc1.vtysh_cmd("show ip route nhrp")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
json_file = "{}/{}/nhrp_shortcut_present.json".format(CWD, nhc1.name)
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, nhc1, "show ip nhrp shortcut json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = nhc1.vtysh_cmd("show ip nhrp shortcut")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
assertmsg = '"{}" JSON output mismatches'.format(nhc1.name)
|
||
|
|
assert result is None, assertmsg
|
||
|
|
|
||
|
|
# Now verify shortcut is purged with lack of traffic
|
||
|
|
json_file = "{}/{}/nhrp_route_nhs1_down.json".format(CWD, nhc1.name)
|
||
|
|
assertmsg = "No nhrp_route file found"
|
||
|
|
assert os.path.isfile(json_file), assertmsg
|
||
|
|
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, nhc1, "show ip route nhrp json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = nhc1.vtysh_cmd("show ip route nhrp")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
assertmsg = '"{}" JSON output mismatches'.format(nhc1.name)
|
||
|
|
assert result is None, assertmsg
|
||
|
|
|
||
|
|
json_file = "{}/{}/nhrp_shortcut_absent.json".format(CWD, nhc1.name)
|
||
|
|
expected = json.loads(open(json_file).read())
|
||
|
|
test_func = partial(
|
||
|
|
topotest.router_json_cmp, nhc1, "show ip nhrp shortcut json", expected
|
||
|
|
)
|
||
|
|
_, result = topotest.run_and_expect(test_func, None, count=40, wait=0.5)
|
||
|
|
|
||
|
|
output = nhc1.vtysh_cmd("show ip nhrp shortcut")
|
||
|
|
logger.info(output)
|
||
|
|
|
||
|
|
assertmsg = '"{}" JSON output mismatches'.format(nhc1.name)
|
||
|
|
assert result is None, assertmsg
|
||
|
|
|
||
|
|
|
||
|
|
def test_memory_leak():
|
||
|
|
"Run the memory leak test and report results."
|
||
|
|
tgen = get_topogen()
|
||
|
|
if not tgen.is_memleak_enabled():
|
||
|
|
pytest.skip("Memory leak test/report is disabled")
|
||
|
|
|
||
|
|
tgen.report_memory_leaks()
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
args = ["-s"] + sys.argv[1:]
|
||
|
|
sys.exit(pytest.main(args))
|