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test_brb2.py
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test_brb2.py
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#!/usr/bin/env python
# Copyright (c) PLUMgrid, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
# This program implements a topology likes below:
# pem: physical endpoint manager, implemented as a bpf program
#
# vm1 <--------+ +----> bridge1 <----+
# V V V
# pem router
# ^ ^ ^
# vm2 <--------+ +----> bridge2 <----+
#
# The vm1, vm2 and router are implemented as namespaces.
# The linux bridge device is used to provice bridge functionality.
# pem bpf will be attached to related network devices for vm1, vm1, bridge1 and bridge2.
#
# vm1 and vm2 are in different subnet. For vm1 to communicate to vm2,
# the packet will have to travel from vm1 to pem, bridge1, router, bridge2, pem, and
# then come to vm2.
#
# When this test is run with verbose mode (ctest -R <test_name> -V),
# the following printout is observed on my local box:
#
# ......
# 9: PING 200.1.1.1 (200.1.1.1) 56(84) bytes of data.
# 9: 64 bytes from 200.1.1.1: icmp_req=1 ttl=63 time=0.090 ms
# 9: 64 bytes from 200.1.1.1: icmp_req=2 ttl=63 time=0.032 ms
# 9:
# 9: --- 200.1.1.1 ping statistics ---
# 9: 2 packets transmitted, 2 received, 0% packet loss, time 999ms
# 9: rtt min/avg/max/mdev = 0.032/0.061/0.090/0.029 ms
# 9: [ ID] Interval Transfer Bandwidth
# 9: [ 5] 0.0- 1.0 sec 3.80 GBytes 32.6 Gbits/sec
# 9: Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
# 9: MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 200.1.1.1 (200.1.1.1) port 0 AF_INET : demo
# 9: Recv Send Send
# 9: Socket Socket Message Elapsed
# 9: Size Size Size Time Throughput
# 9: bytes bytes bytes secs. 10^6bits/sec
# 9:
# 9: 87380 16384 65160 1.00 39940.46
# 9: MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 200.1.1.1 (200.1.1.1) port 0 AF_INET : demo : first burst 0
# 9: Local /Remote
# 9: Socket Size Request Resp. Elapsed Trans.
# 9: Send Recv Size Size Time Rate
# 9: bytes Bytes bytes bytes secs. per sec
# 9:
# 9: 16384 87380 1 1 1.00 46387.80
# 9: 16384 87380
# 9: .
# 9: ----------------------------------------------------------------------
# 9: Ran 1 test in 7.495s
# 9:
# 9: OK
from ctypes import c_uint
from bcc import BPF
from pyroute2 import IPRoute, NetNS, IPDB, NSPopen
import sys
from time import sleep
from unittest import main, TestCase
import subprocess
from simulation import Simulation
arg1 = sys.argv.pop(1)
ipr = IPRoute()
ipdb = IPDB(nl=ipr)
sim = Simulation(ipdb)
class TestBPFSocket(TestCase):
def setup_br(self, br, veth_rt_2_br, veth_pem_2_br, veth_br_2_pem):
# create veth which connecting pem and br
with ipdb.create(ifname=veth_pem_2_br, kind="veth", peer=veth_br_2_pem) as v:
v.up()
ipdb.interfaces[veth_br_2_pem].up().commit()
subprocess.call(["sysctl", "-q", "-w", "net.ipv6.conf." + veth_pem_2_br + ".disable_ipv6=1"])
subprocess.call(["sysctl", "-q", "-w", "net.ipv6.conf." + veth_br_2_pem + ".disable_ipv6=1"])
# set up the bridge and add router interface as one of its slaves
with ipdb.create(ifname=br, kind="bridge") as br1:
br1.add_port(ipdb.interfaces[veth_pem_2_br])
br1.add_port(ipdb.interfaces[veth_rt_2_br])
br1.up()
subprocess.call(["sysctl", "-q", "-w", "net.ipv6.conf." + br + ".disable_ipv6=1"])
def set_default_const(self):
self.ns1 = "ns1"
self.ns2 = "ns2"
self.ns_router = "ns_router"
self.br1 = "br1"
self.veth_pem_2_br1 = "v20"
self.veth_br1_2_pem = "v21"
self.br2 = "br2"
self.veth_pem_2_br2 = "v22"
self.veth_br2_2_pem = "v23"
self.vm1_ip = "100.1.1.1"
self.vm2_ip = "200.1.1.1"
self.vm1_rtr_ip = "100.1.1.254"
self.vm2_rtr_ip = "200.1.1.254"
self.vm1_rtr_mask = "100.1.1.0/24"
self.vm2_rtr_mask = "200.1.1.0/24"
def attach_filter(self, ifname, fd, name):
ifindex = ipdb.interfaces[ifname].index
ipr.tc("add", "ingress", ifindex, "ffff:")
ipr.tc("add-filter", "bpf", ifindex, ":1", fd=fd, name=name,
parent="ffff:", action="drop", classid=1)
def config_maps(self):
# pem just relays packets between VM and its corresponding
# slave link in the bridge interface
ns1_ifindex = self.ns1_eth_out.index
ns2_ifindex = self.ns2_eth_out.index
br1_ifindex = ipdb.interfaces[self.veth_br1_2_pem].index
br2_ifindex = ipdb.interfaces[self.veth_br2_2_pem].index
self.pem_dest[c_uint(ns1_ifindex)] = c_uint(br1_ifindex)
self.pem_dest[c_uint(br1_ifindex)] = c_uint(ns1_ifindex)
self.pem_dest[c_uint(ns2_ifindex)] = c_uint(br2_ifindex)
self.pem_dest[c_uint(br2_ifindex)] = c_uint(ns2_ifindex)
# tc filter setup with bpf programs attached
self.attach_filter(self.veth_br1_2_pem, self.pem_fn.fd, self.pem_fn.name)
self.attach_filter(self.veth_br2_2_pem, self.pem_fn.fd, self.pem_fn.name)
def test_brb2(self):
try:
b = BPF(src_file=arg1, debug=0)
self.pem_fn = b.load_func("pem", BPF.SCHED_CLS)
self.pem_dest= b.get_table("pem_dest")
self.pem_stats = b.get_table("pem_stats")
# set up the topology
self.set_default_const()
(ns1_ipdb, self.ns1_eth_out, _) = sim._create_ns(self.ns1, ipaddr=self.vm1_ip+'/24',
fn=self.pem_fn, action='drop',
disable_ipv6=True)
(ns2_ipdb, self.ns2_eth_out, _) = sim._create_ns(self.ns2, ipaddr=self.vm2_ip+'/24',
fn=self.pem_fn, action='drop',
disable_ipv6=True)
ns1_ipdb.routes.add({'dst': self.vm2_rtr_mask, 'gateway': self.vm1_rtr_ip}).commit()
ns2_ipdb.routes.add({'dst': self.vm1_rtr_mask, 'gateway': self.vm2_rtr_ip}).commit()
(_, self.nsrtr_eth0_out, _) = sim._create_ns(self.ns_router, ipaddr=self.vm1_rtr_ip+'/24',
disable_ipv6=True)
(rt_ipdb, self.nsrtr_eth1_out, _) = sim._ns_add_ifc(self.ns_router, "eth1", "ns_router2",
ipaddr=self.vm2_rtr_ip+'/24',
disable_ipv6=True)
# enable ip forwarding in router ns
nsp = NSPopen(rt_ipdb.nl.netns, ["sysctl", "-w", "net.ipv4.ip_forward=1"])
nsp.wait(); nsp.release()
# for each VM connecting to pem, there will be a corresponding veth connecting to the bridge
self.setup_br(self.br1, self.nsrtr_eth0_out.ifname, self.veth_pem_2_br1, self.veth_br1_2_pem)
self.setup_br(self.br2, self.nsrtr_eth1_out.ifname, self.veth_pem_2_br2, self.veth_br2_2_pem)
# load the program and configure maps
self.config_maps()
# ping
nsp = NSPopen(ns1_ipdb.nl.netns, ["ping", self.vm2_ip, "-c", "2"]); nsp.wait(); nsp.release()
# one arp request/reply, 2 icmp request/reply per VM, total 6 packets per VM, 12 packets total
self.assertEqual(self.pem_stats[c_uint(0)].value, 12)
nsp_server = NSPopen(ns2_ipdb.nl.netns, ["iperf", "-s", "-xSC"])
sleep(1)
nsp = NSPopen(ns1_ipdb.nl.netns, ["iperf", "-c", self.vm2_ip, "-t", "1", "-xSC"])
nsp.wait(); nsp.release()
nsp_server.kill(); nsp_server.wait(); nsp_server.release()
nsp_server = NSPopen(ns2_ipdb.nl.netns, ["netserver", "-D"])
sleep(1)
nsp = NSPopen(ns1_ipdb.nl.netns, ["netperf", "-l", "1", "-H", self.vm2_ip, "--", "-m", "65160"])
nsp.wait(); nsp.release()
nsp = NSPopen(ns1_ipdb.nl.netns, ["netperf", "-l", "1", "-H", self.vm2_ip, "-t", "TCP_RR"])
nsp.wait(); nsp.release()
nsp_server.kill(); nsp_server.wait(); nsp_server.release()
finally:
if self.br1 in ipdb.interfaces: ipdb.interfaces[self.br1].remove().commit()
if self.br2 in ipdb.interfaces: ipdb.interfaces[self.br2].remove().commit()
if self.veth_pem_2_br1 in ipdb.interfaces: ipdb.interfaces[self.veth_pem_2_br1].remove().commit()
if self.veth_pem_2_br2 in ipdb.interfaces: ipdb.interfaces[self.veth_pem_2_br2].remove().commit()
sim.release()
ipdb.release()
if __name__ == "__main__":
main()