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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
from utils import NSPopenWithCheck, mayFail
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)
allocated_interfaces = set(ipdb.interfaces.keys())
def get_next_iface(prefix):
i = 0
while True:
iface = "{0}{1}".format(prefix, i)
if iface not in allocated_interfaces:
allocated_interfaces.add(iface)
return iface
i += 1
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 = get_next_iface("br")
self.veth_pem_2_br1 = "v20"
self.veth_br1_2_pem = "v21"
self.br2 = get_next_iface("br")
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)
@mayFail("This fails on github actions environment, and needs to be fixed")
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 = NSPopenWithCheck(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 = NSPopenWithCheck(ns2_ipdb.nl.netns, ["netserver", "-D"])
sleep(1)
nsp = NSPopenWithCheck(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()
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