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#!/usr/bin/env python
""" L2BD ARP term Test """
import unittest
import random
import copy
from scapy.packet import Raw
from scapy.layers.l2 import Ether, ARP
from scapy.layers.inet import IP
from framework import VppTestCase, VppTestRunner
from util import Host, ppp, mactobinary
class TestL2bdArpTerm(VppTestCase):
""" L2BD arp termination Test Case """
@classmethod
def setUpClass(cls):
"""
Perform standard class setup (defined by class method setUpClass in
class VppTestCase) before running the test case, set test case related
variables and configure VPP.
"""
super(TestL2bdArpTerm, cls).setUpClass()
try:
# Create pg interfaces
n_bd = 1
cls.ifs_per_bd = ifs_per_bd = 3
n_ifs = n_bd * ifs_per_bd
cls.create_pg_interfaces(range(n_ifs))
# Set up all interfaces
for i in cls.pg_interfaces:
i.admin_up()
cls.hosts = set()
except Exception:
super(TestL2bdArpTerm, cls).tearDownClass()
raise
def setUp(self):
"""
Clear trace and packet infos before running each test.
"""
self.reset_packet_infos()
super(TestL2bdArpTerm, self).setUp()
def tearDown(self):
"""
Show various debug prints after each test.
"""
super(TestL2bdArpTerm, self).tearDown()
if not self.vpp_dead:
self.logger.info(self.vapi.ppcli("show l2fib verbose"))
self.logger.info(self.vapi.ppcli("show bridge-domain 1 detail"))
def add_del_arp_term_hosts(self, entries, bd_id=1, is_add=1):
for e in entries:
self.vapi.bd_ip_mac_add_del(bd_id=bd_id,
mac=e.bin_mac,
ip=e.ip4n,
is_ipv6=0,
is_add=is_add)
@classmethod
def mac_list(cls, b6_range):
return ["00:00:ca:fe:00:%02x" % b6 for b6 in b6_range]
@classmethod
def ip4_host(cls, subnet, host, mac):
return Host(mac=mac,
ip4="172.17.1%02u.%u" % (subnet, host))
@classmethod
def ip4_hosts(cls, subnet, start, mac_list):
return {cls.ip4_host(subnet, start + j, mac_list[j])
for j in range(len(mac_list))}
@classmethod
def bd_swifs(cls, b):
n = cls.ifs_per_bd
start = (b - 1) * n
return [cls.pg_interfaces[j] for j in range(start, start + n)]
def bd_add_del(self, bd_id=1, is_add=1):
if is_add:
self.vapi.bridge_domain_add_del(bd_id=bd_id, is_add=is_add)
for swif in self.bd_swifs(bd_id):
swif_idx = swif.sw_if_index
self.vapi.sw_interface_set_l2_bridge(
swif_idx, bd_id=bd_id, enable=is_add)
if not is_add:
self.vapi.bridge_domain_add_del(bd_id=bd_id, is_add=is_add)
@classmethod
def arp(cls, src_host, host):
return (Ether(dst="ff:ff:ff:ff:ff:ff", src=src_host.mac) /
ARP(op="who-has",
hwsrc=src_host.bin_mac,
pdst=host.ip4,
psrc=src_host.ip4))
@classmethod
def arp_reqs(cls, src_host, entries):
return [cls.arp(src_host, e) for e in entries]
def response_host(self, src_host, arp_resp):
ether = arp_resp[Ether]
self.assertEqual(ether.dst, src_host.mac)
arp = arp_resp[ARP]
self.assertEqual(arp.hwtype, 1)
self.assertEqual(arp.ptype, 0x800)
self.assertEqual(arp.hwlen, 6)
self.assertEqual(arp.plen, 4)
arp_opts = {"who-has": 1, "is-at": 2}
self.assertEqual(arp.op, arp_opts["is-at"])
self.assertEqual(arp.hwdst, src_host.mac)
self.assertEqual(arp.pdst, src_host.ip4)
return Host(arp.hwsrc, arp.psrc)
def arp_resp_hosts(self, src_host, pkts):
return {self.response_host(src_host, p) for p in pkts}
def set_bd_flags(self, bd_id, **args):
"""
Enable/disable defined feature(s) of the bridge domain.
:param int bd_id: Bridge domain ID.
:param list args: List of feature/status pairs. Allowed features: \
learn, forward, flood, uu_flood and arp_term. Status False means \
disable, status True means enable the feature.
:raise: ValueError in case of unknown feature in the input.
"""
for flag in args:
if flag == "learn":
feature_bitmap = 1 << 0
elif flag == "forward":
feature_bitmap = 1 << 1
elif flag == "flood":
feature_bitmap = 1 << 2
elif flag == "uu_flood":
feature_bitmap = 1 << 3
elif flag == "arp_term":
feature_bitmap = 1 << 4
else:
raise ValueError("Unknown feature used: %s" % flag)
is_set = 1 if args[flag] else 0
self.vapi.bridge_flags(bd_id, is_set, feature_bitmap)
self.logger.info("Bridge domain ID %d updated" % bd_id)
def verify_arp(self, src_host, req_hosts, resp_hosts, bd_id=1):
reqs = self.arp_reqs(src_host, req_hosts)
for swif in self.bd_swifs(bd_id):
swif.add_stream(reqs)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
for swif in self.bd_swifs(bd_id):
resp_pkts = swif.get_capture(len(resp_hosts))
resps = self.arp_resp_hosts(src_host, resp_pkts)
self.assertEqual(len(resps ^ resp_hosts), 0)
def test_l2bd_arp_term_01(self):
""" L2BD arp term - add 5 hosts, verify arp responses
"""
src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
self.bd_add_del(1, is_add=1)
self.set_bd_flags(1, arp_term=True, flood=False,
uu_flood=False, learn=False)
macs = self.mac_list(range(1, 5))
hosts = self.ip4_hosts(4, 1, macs)
self.add_del_arp_term_hosts(hosts, is_add=1)
self.verify_arp(src_host, hosts, hosts)
type(self).hosts = hosts
def test_l2bd_arp_term_02(self):
""" L2BD arp term - delete 3 hosts, verify arp responses
"""
src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
macs = self.mac_list(range(1, 3))
deleted = self.ip4_hosts(4, 1, macs)
self.add_del_arp_term_hosts(deleted, is_add=0)
remaining = self.hosts - deleted
self.verify_arp(src_host, self.hosts, remaining)
type(self).hosts = remaining
self.bd_add_del(1, is_add=0)
def test_l2bd_arp_term_03(self):
""" L2BD arp term - recreate BD1, readd 3 hosts, verify arp responses
"""
src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
self.bd_add_del(1, is_add=1)
self.set_bd_flags(1, arp_term=True, flood=False,
uu_flood=False, learn=False)
macs = self.mac_list(range(1, 3))
readded = self.ip4_hosts(4, 1, macs)
self.add_del_arp_term_hosts(readded, is_add=1)
self.verify_arp(src_host, self.hosts | readded, readded)
type(self).hosts = readded
def test_l2bd_arp_term_04(self):
""" L2BD arp term - 2 IP4 addrs per host
"""
src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
macs = self.mac_list(range(1, 3))
sub5_hosts = self.ip4_hosts(5, 1, macs)
self.add_del_arp_term_hosts(sub5_hosts, is_add=1)
hosts = self.hosts | sub5_hosts
self.verify_arp(src_host, hosts, hosts)
type(self).hosts = hosts
self.bd_add_del(1, is_add=0)
def test_l2bd_arp_term_05(self):
""" L2BD arp term - create and update 10 IP4-mac pairs
"""
src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
self.bd_add_del(1, is_add=1)
self.set_bd_flags(1, arp_term=True, flood=False,
uu_flood=False, learn=False)
macs1 = self.mac_list(range(10, 20))
hosts1 = self.ip4_hosts(5, 1, macs1)
self.add_del_arp_term_hosts(hosts1, is_add=1)
self.verify_arp(src_host, hosts1, hosts1)
macs2 = self.mac_list(range(20, 30))
hosts2 = self.ip4_hosts(5, 1, macs2)
self.add_del_arp_term_hosts(hosts2, is_add=1)
self.verify_arp(src_host, hosts1, hosts2)
self.bd_add_del(1, is_add=0)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
|
