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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright (c) 2015-2016 Savoir-faire Linux Inc.
# Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; If not, see <http://www.gnu.org/licenses/>.
import argparse, subprocess
from pyroute2 import IPDB, NetNS
from pyroute2.netns.process.proxy import NSPopen
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Creates a virtual network topology for testing')
parser.add_argument('-i', '--ifname', help='interface name', default='ethdht')
parser.add_argument('-n', '--ifnum', type=int, help='number of isolated interfaces to create', default=1)
parser.add_argument('-r', '--remove', help='remove instead of adding network interfaces', action="store_true")
parser.add_argument('-l', '--loss', help='simulated packet loss (percent)', type=int, default=0)
parser.add_argument('-d', '--delay', help='simulated latency (ms)', type=int, default=0)
parser.add_argument('-4', '--ipv4', help='Enable IPv4', action="store_true")
parser.add_argument('-6', '--ipv6', help='Enable IPv6', action="store_true")
args = parser.parse_args()
local_addr4 = '10.0.42.'
local_addr6 = '2001:db9::'
brige_name = 'br'+args.ifname
ip = None
try:
ip = IPDB()
if args.remove:
# cleanup interfaces
for ifn in range(args.ifnum):
iface = args.ifname+str(ifn)
if iface in ip.interfaces:
with ip.interfaces[iface] as i:
i.remove()
if 'tap'+args.ifname in ip.interfaces:
with ip.interfaces['tap'+args.ifname] as i:
i.remove()
if brige_name in ip.interfaces:
with ip.interfaces[brige_name] as i:
i.remove()
for ifn in range(args.ifnum):
netns = NetNS('node'+str(ifn))
netns.close()
netns.remove()
else:
for ifn in range(args.ifnum):
iface = args.ifname+str(ifn)
if not iface in ip.interfaces:
ip.create(kind='veth', ifname=iface, peer=iface+'.1').commit()
ip.create(kind='tuntap', ifname='tap'+args.ifname, mode='tap').commit()
with ip.create(kind='bridge', ifname=brige_name) as i:
for ifn in range(args.ifnum):
iface = args.ifname+str(ifn)
i.add_port(ip.interfaces[iface])
i.add_port(ip.interfaces['tap'+args.ifname])
if args.ipv4:
i.add_ip(local_addr4+'1/24')
if args.ipv6:
i.add_ip(local_addr6+'1/64')
i.up()
with ip.interfaces['tap'+args.ifname] as tap:
tap.up()
for ifn in range(args.ifnum):
iface = args.ifname+str(ifn)
nns = NetNS('node'+str(ifn))
iface1 = iface+'.1'
with ip.interfaces[iface1] as i:
i.net_ns_fd = nns.netns
with ip.interfaces[iface] as i:
i.up()
ip_ns = IPDB(nl=nns)
try:
with ip_ns.interfaces.lo as lo:
lo.up()
with ip_ns.interfaces[iface1] as i:
if args.ipv4:
i.add_ip(local_addr4+str(ifn+8)+'/24')
if args.ipv6:
i.add_ip(local_addr6+str(ifn+8)+'/64')
i.up()
finally:
ip_ns.release()
nsp = NSPopen(nns.netns, ["tc", "qdisc", "add", "dev", iface1, "root", "netem", "delay", str(args.delay)+"ms", str(int(args.delay/2))+"ms", "loss", str(args.loss)+"%", "25%"], stdout=subprocess.PIPE)
#print(nsp.communicate()[0].decode())
nsp.communicate()
nsp.wait()
nsp.release()
if args.ipv4:
subprocess.call(["sysctl", "-w", "net.ipv4.conf."+brige_name+".forwarding=1"])
if args.ipv6:
subprocess.call(["sysctl", "-w", "net.ipv6.conf."+brige_name+".forwarding=1"])
except Exception as e:
print('Error',e)
finally:
if ip:
ip.release()
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