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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 bridge is implemented with limited functionality in bpf program.
#
# 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:
#
# ......
# 8: ARPING 100.1.1.254 from 100.1.1.1 eth0
# 8: Unicast reply from 100.1.1.254 [76:62:B5:5C:8C:6F] 0.533ms
# 8: Sent 1 probes (1 broadcast(s))
# 8: Received 1 response(s)
# 8: ARPING 200.1.1.254 from 200.1.1.1 eth0
# 8: Unicast reply from 200.1.1.254 [F2:F0:B4:ED:7B:1B] 0.524ms
# 8: Sent 1 probes (1 broadcast(s))
# 8: Received 1 response(s)
# 8: PING 200.1.1.1 (200.1.1.1) 56(84) bytes of data.
# 8: 64 bytes from 200.1.1.1: icmp_req=1 ttl=63 time=0.074 ms
# 8: 64 bytes from 200.1.1.1: icmp_req=2 ttl=63 time=0.061 ms
# 8:
# 8: --- 200.1.1.1 ping statistics ---
# 8: 2 packets transmitted, 2 received, 0% packet loss, time 999ms
# 8: rtt min/avg/max/mdev = 0.061/0.067/0.074/0.010 ms
# 8: [ ID] Interval Transfer Bandwidth
# 8: [ 5] 0.0- 1.0 sec 4.00 GBytes 34.3 Gbits/sec
# 8: Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
# 8: 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
# 8: Recv Send Send
# 8: Socket Socket Message Elapsed
# 8: Size Size Size Time Throughput
# 8: bytes bytes bytes secs. 10^6bits/sec
# 8:
# 8: 87380 16384 65160 1.00 41991.68
# 8: 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
# 8: Local /Remote
# 8: Socket Size Request Resp. Elapsed Trans.
# 8: Send Recv Size Size Time Rate
# 8: bytes Bytes bytes bytes secs. per sec
# 8:
# 8: 16384 87380 1 1 1.00 48645.53
# 8: 16384 87380
# 8: .
# 8: ----------------------------------------------------------------------
# 8: Ran 1 test in 11.296s
# 8:
# 8: OK
from ctypes import c_uint
from netaddr import IPAddress, EUI
from bcc import BPF
from pyroute2 import IPRoute, NetNS, IPDB, NSPopen
from utils import NSPopenWithCheck
import sys
from time import sleep
from unittest import main, TestCase
from simulation import Simulation
arg1 = sys.argv.pop(1)
ipr = IPRoute()
ipdb = IPDB(nl=ipr)
sim = Simulation(ipdb)
class TestBPFSocket(TestCase):
def set_default_const(self):
self.ns1 = "ns1"
self.ns2 = "ns2"
self.ns_router = "ns_router"
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 get_table(self, b):
self.jump = b.get_table("jump")
self.pem_dest = b.get_table("pem_dest")
self.pem_port = b.get_table("pem_port")
self.pem_ifindex = b.get_table("pem_ifindex")
self.pem_stats = b.get_table("pem_stats")
self.br1_dest = b.get_table("br1_dest")
self.br1_mac = b.get_table("br1_mac")
self.br1_rtr = b.get_table("br1_rtr")
self.br2_dest = b.get_table("br2_dest")
self.br2_mac = b.get_table("br2_mac")
self.br2_rtr = b.get_table("br2_rtr")
def connect_ports(self, prog_id_pem, prog_id_br, curr_pem_pid, curr_br_pid,
br_dest_map, br_mac_map, ifindex, vm_mac, vm_ip):
self.pem_dest[c_uint(curr_pem_pid)] = self.pem_dest.Leaf(prog_id_br, curr_br_pid)
br_dest_map[c_uint(curr_br_pid)] = br_dest_map.Leaf(prog_id_pem, curr_pem_pid)
self.pem_port[c_uint(curr_pem_pid)] = c_uint(ifindex)
self.pem_ifindex[c_uint(ifindex)] = c_uint(curr_pem_pid)
mac_addr = br_mac_map.Key(int(EUI(vm_mac)))
br_mac_map[mac_addr] = c_uint(curr_br_pid)
def config_maps(self):
# program id
prog_id_pem = 1
prog_id_br1 = 2
prog_id_br2 = 3
# initial port id and table pointers
curr_pem_pid = 0
curr_br1_pid = 0
curr_br2_pid = 0
# configure jump table
self.jump[c_uint(prog_id_pem)] = c_uint(self.pem_fn.fd)
self.jump[c_uint(prog_id_br1)] = c_uint(self.br1_fn.fd)
self.jump[c_uint(prog_id_br2)] = c_uint(self.br2_fn.fd)
# connect pem and br1
curr_pem_pid = curr_pem_pid + 1
curr_br1_pid = curr_br1_pid + 1
self.connect_ports(prog_id_pem, prog_id_br1, curr_pem_pid, curr_br1_pid,
self.br1_dest, self.br1_mac,
self.ns1_eth_out.index, self.vm1_mac, self.vm1_ip)
# connect pem and br2
curr_pem_pid = curr_pem_pid + 1
curr_br2_pid = curr_br2_pid + 1
self.connect_ports(prog_id_pem, prog_id_br2, curr_pem_pid, curr_br2_pid,
self.br2_dest, self.br2_mac,
self.ns2_eth_out.index, self.vm2_mac, self.vm2_ip)
# connect <br1, rtr> and <br2, rtr>
self.br1_rtr[c_uint(0)] = c_uint(self.nsrtr_eth0_out.index)
self.br2_rtr[c_uint(0)] = c_uint(self.nsrtr_eth1_out.index)
def test_brb(self):
try:
b = BPF(src_file=arg1, debug=0)
self.pem_fn = b.load_func("pem", BPF.SCHED_CLS)
self.br1_fn = b.load_func("br1", BPF.SCHED_CLS)
self.br2_fn = b.load_func("br2", BPF.SCHED_CLS)
self.get_table(b)
# 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.vm1_mac = ns1_ipdb.interfaces['eth0'].address
self.vm2_mac = ns2_ipdb.interfaces['eth0'].address
(_, self.nsrtr_eth0_out, _) = sim._create_ns(self.ns_router, ipaddr=self.vm1_rtr_ip+'/24',
fn=self.br1_fn, action='drop',
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',
fn=self.br2_fn, action='drop',
disable_ipv6=True)
nsp = NSPopen(rt_ipdb.nl.netns, ["sysctl", "-w", "net.ipv4.ip_forward=1"])
nsp.wait(); nsp.release()
# configure maps
self.config_maps()
# our bridge is not smart enough, so send arping for router learning to prevent router
# from sending out arp request
nsp = NSPopen(ns1_ipdb.nl.netns,
["arping", "-w", "1", "-c", "1", "-I", "eth0", self.vm1_rtr_ip])
nsp.wait(); nsp.release()
nsp = NSPopen(ns2_ipdb.nl.netns,
["arping", "-w", "1", "-c", "1", "-I", "eth0", self.vm2_rtr_ip])
nsp.wait(); nsp.release()
# ping
nsp = NSPopen(ns1_ipdb.nl.netns, ["ping", self.vm2_ip, "-c", "2"])
nsp.wait(); nsp.release()
# pem_stats only counts pem->bridge traffic, each VM has 4: arping/arp request/2 icmp request
# total 8 packets should be counted
self.assertEqual(self.pem_stats[c_uint(0)].value, 8)
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:
sim.release()
ipdb.release()
if __name__ == "__main__":
main()
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