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topo.py
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topo.py
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#!/usr/bin/python2
import os
from pathlib import Path
import threading
import time
import signal
import sys
import tests
from mininet.log import setLogLevel
from mininet.net import Mininet
from mininet.topo import Topo
from mininet.util import dumpNodeConnections
import info
import os.path
from os import path
POINTS_PER_TEST = 1
def signal_handler(signal, frame):
sys.exit(0)
def static_arp():
srcp = os.path.join("src", info.ARP_TABLE)
return path.exists(info.ARP_TABLE) or path.exists(srcp)
class FullTopo(Topo):
def build(self, nr=2, nh=2):
routers = []
for i in range(nr):
routers.append(self.addHost(info.get("router_name", i)))
for i in range(nr):
for j in range(i + 1, nr):
ifn = info.get("r2r_if_name", i, j)
self.addLink(routers[i], routers[j], intfName1=ifn,
intfName2=ifn)
for i in range(nr):
for j in range(nh):
hidx = i * nh + j
host = self.addHost(info.get("host_name", hidx))
i1 = info.get("host_if_name", hidx)
i2 = info.get("router_if_name", j)
self.addLink(host, routers[i], intfName1=i1, intfName2=i2)
class FullNM(object):
def __init__(self, net, n_routers, n_hosts):
self.net = net
self.hosts = []
self.routers = []
self.n_hosts = n_hosts
for i in range(n_routers):
r = self.net.get(info.get("router_name", i))
hosts = []
for j in range(n_hosts):
hidx = i * n_hosts + j
h = self.net.get(info.get("host_name", hidx))
hosts.append(h)
self.hosts.append(h)
self.routers.append((r, hosts))
def setup_ifaces(self):
for i, (router, hosts) in enumerate(self.routers):
for j, host in enumerate(hosts):
hidx = i * len(hosts) + j
host_ip = info.get("host_ip", hidx)
router_ip = info.get("router_ip", hidx)
host_if = info.get("host_if_name", hidx)
router_if = info.get("router_if_name", j)
router.setIP(router_ip, prefixLen=24, intf=router_if)
host.setIP(host_ip, prefixLen=24, intf=host_if)
nr = len(self.routers)
for i in range(nr):
for j in range(i + 1, nr):
ri_if = info.get("r2r_if_name", i, j)
rj_if = info.get("r2r_if_name", i, j)
ri_ip = info.get("r2r_ip1", i, j)
rj_ip = info.get("r2r_ip2", i, j)
self.routers[i][0].setIP(ri_ip, prefixLen=24, intf=ri_if)
self.routers[j][0].setIP(rj_ip, prefixLen=24, intf=rj_if)
def setup_macs(self):
for i, (router, hosts) in enumerate(self.routers):
for j, host in enumerate(hosts):
hidx = i * len(hosts) + j
h_mac = info.get("host_mac", hidx)
h_if = info.get("host_if_name", hidx)
host.cmd("ifconfig {} hw ether {}".format(h_if, h_mac))
r_mac = info.get("router_mac", hidx, i)
r_if = info.get("router_if_name", j)
router.cmd("ifconfig {} hw ether {}".format(r_if, r_mac))
nr = len(self.routers)
for i in range(nr):
for j in range(i + 1, nr):
ri_mac = info.get("r2r_mac", i, j)
rj_mac = info.get("r2r_mac", j, i)
ri_if = info.get("r2r_if_name", i, j)
rj_if = info.get("r2r_if_name", i, j)
self.routers[i][0].cmd("ifconfig {} hw ether {}".format(ri_if,
ri_mac))
self.routers[j][0].cmd("ifconfig {} hw ether {}".format(rj_if,
rj_mac))
def disable_unneeded(self):
def disable_ipv6(host):
host.cmd('sysctl -w net.ipv6.conf.all.disable_ipv6=1')
host.cmd('sysctl -w net.ipv6.conf.default.disable_ipv6=1')
def disable_nic_checksum(host, iface):
host.cmd('ethtool iface {} --offload rx off tx off'.format(iface))
host.cmd('ethtool -K {} tx-checksum-ip-generic off'.format(iface))
def disable_arp(host, iface):
host.cmd("ip link set dev {} arp off".format(iface))
for i, (router, hosts) in enumerate(self.routers):
disable_ipv6(router)
for j, host in enumerate(hosts):
disable_ipv6(host)
hidx = i * len(hosts) + j
h_if = info.get("host_if_name", hidx)
disable_nic_checksum(host, h_if)
# we want complete control over these actions
router.cmd('echo "0" > /proc/sys/net/ipv4/ip_forward')
router.cmd('echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all')
if not static_arp():
for (i, (router, hosts)) in enumerate(self.routers):
for j in range(len(hosts)):
hidx = i * len(hosts) + j
ifn = info.get("router_if_name", hidx)
disable_arp(router, ifn)
def add_default_routes(self):
for i, (router, hosts) in enumerate(self.routers):
for j, host in enumerate(hosts):
hidx = i * len(hosts) + j
ip = info.get("router_ip", hidx)
host.cmd("ip route add default via {}".format(ip))
def add_hosts_entries(self):
for i, (router, hosts) in enumerate(self.routers):
for j, host in enumerate(hosts):
for h in range(len(self.hosts)):
ip = info.get("host_ip", h)
# FIXME entries should be added only if they aren't there.
host.cmd("echo '{} h{}' >> /etc/hosts".format(ip, h))
def setup(self):
self.disable_unneeded()
self.setup_ifaces()
self.setup_macs()
self.add_hosts_entries()
self.add_default_routes()
def start_routers(self):
ifaces = ""
for i in range(len(self.routers)):
for j in range(i + 1, len(self.routers)):
ifaces += "{} ".format(info.get("r2r_if_name", i, j))
for i in range(self.n_hosts):
ifaces += "{} ".format(info.get("router_if_name", i))
for i, (router, _) in enumerate(self.routers):
out = info.get("out_file", i)
err = info.get("err_file", i)
rtable = info.get("rtable", i)
rname = "router{}".format(i)
router.cmd("ln -s router {}".format(rname))
if not len(router.cmd("pgrep {}".format(rname))):
cmd = "./{} {} {} > {} 2> {} &".format(rname, rtable, ifaces,
out, err)
router.cmd(cmd)
time.sleep(info.TIMEOUT / 2)
def run_test(self, testname):
# restart router if dead
self.start_routers()
log = os.path.join(info.LOGDIR, testname)
Path(log).mkdir(parents=True, exist_ok=True)
test = tests.TESTS[testname]
for hp in range(len(self.hosts)):
lout = os.path.join(log, info.get("output_file", hp))
lerr = os.path.join(log, info.get("error_file", hp))
cmd = "./checker.py \
--passive \
--testname={} \
--host={} \
> {} \
2> {} &".format(testname, hp, lout, lerr)
self.hosts[hp].cmd(cmd)
time.sleep(info.TIMEOUT / 2)
cmd = "./checker.py \
--active \
--testname={} \
--host={} &".format(testname, test.host_s)
self.hosts[test.host_s].cmd(cmd)
results = {}
time.sleep(info.TIMEOUT)
for hp in range(len(self.hosts)):
lout = os.path.join(log, info.get("output_file", hp))
with open(lout, "r") as fin:
results[hp] = fin.read().strip("\r\n")
return results
def validate_test_results(results):
passed = True
for result in results.values():
passed = passed and (result == "PASS")
return passed
def should_skip(testname):
if static_arp():
return testname in {"router_arp_reply", "router_arp_request"}
return False
def main(run_tests=False):
topo = FullTopo(nr=info.N_ROUTERS, nh=info.N_HOSTSEACH)
net = Mininet(topo)
net.start()
nm = FullNM(net, info.N_ROUTERS, info.N_HOSTSEACH)
nm.setup()
print("{:=^80}\n".format(" Running tests "))
if run_tests:
for testname in tests.TESTS:
skipped = False
if should_skip(testname):
skipped = True
passed = False
else:
results = nm.run_test(testname)
passed = validate_test_results(results)
str_status = "PASSED" if passed else "FAILED"
if skipped:
str_status = "SKIPPED"
print("{: >20} {:.>50} {: >8}".format(testname, "", str_status))
time.sleep(info.TIMEOUT / 2)
else:
net.startTerms()
signal.signal(signal.SIGINT, signal_handler)
forever = threading.Event()
forever.wait()
net.stop()
if __name__ == "__main__":
# Tell mininet to print useful information
if len(sys.argv) > 1 and sys.argv[1] == "tests":
main(run_tests=True)
else:
setLogLevel("info")
main()