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#!/usr/bin/env python
from abc import abstractmethod, ABCMeta
from scapy.layers.l2 import Ether, Raw
from scapy.layers.inet import IP, UDP
class BridgeDomain(object):
""" Bridge domain abstraction """
__metaclass__ = ABCMeta
@property
def frame_request(self):
""" Ethernet frame modeling a generic request """
return (Ether(src='00:00:00:00:00:01', dst='00:00:00:00:00:02') /
IP(src='1.2.3.4', dst='4.3.2.1') /
UDP(sport=10000, dport=20000) /
Raw('\xa5' * 100))
@property
def frame_reply(self):
""" Ethernet frame modeling a generic reply """
return (Ether(src='00:00:00:00:00:02', dst='00:00:00:00:00:01') /
IP(src='4.3.2.1', dst='1.2.3.4') /
UDP(sport=20000, dport=10000) /
Raw('\xa5' * 100))
@abstractmethod
def encap_mcast(self, pkt, src_ip, src_mac, vni):
""" Encapsulate mcast packet """
pass
@abstractmethod
def encapsulate(self, pkt, vni):
""" Encapsulate packet """
pass
@abstractmethod
def decapsulate(self, pkt):
""" Decapsulate packet """
pass
@abstractmethod
def check_encapsulation(self, pkt, vni, local_only=False):
""" Verify the encapsulation """
pass
def assert_eq_pkts(self, pkt1, pkt2):
""" Verify the Ether, IP, UDP, payload are equal in both
packets
"""
self.assertEqual(pkt1[Ether].src, pkt2[Ether].src)
self.assertEqual(pkt1[Ether].dst, pkt2[Ether].dst)
self.assertEqual(pkt1[IP].src, pkt2[IP].src)
self.assertEqual(pkt1[IP].dst, pkt2[IP].dst)
self.assertEqual(pkt1[UDP].sport, pkt2[UDP].sport)
self.assertEqual(pkt1[UDP].dport, pkt2[UDP].dport)
self.assertEqual(pkt1[Raw], pkt2[Raw])
def test_decap(self):
""" Decapsulation test
Send encapsulated frames from pg0
Verify receipt of decapsulated frames on pg1
"""
encapsulated_pkt = self.encapsulate(self.frame_request,
self.single_tunnel_bd)
self.pg0.add_stream([encapsulated_pkt, ])
self.pg1.enable_capture()
self.pg_start()
# Pick first received frame and check if it's the non-encapsulated frame
out = self.pg1.get_capture()
self.assertEqual(len(out), 1,
'Invalid number of packets on '
'output: {}'.format(len(out)))
pkt = out[0]
self.assert_eq_pkts(pkt, self.frame_request)
def test_encap(self):
""" Encapsulation test
Send frames from pg1
Verify receipt of encapsulated frames on pg0
"""
self.pg1.add_stream([self.frame_reply])
self.pg0.enable_capture()
self.pg_start()
# Pick first received frame and check if it's corectly encapsulated.
out = self.pg0.get_capture()
self.assertEqual(len(out), 1,
'Invalid number of packets on '
'output: {}'.format(len(out)))
pkt = out[0]
self.check_encapsulation(pkt, self.single_tunnel_bd)
payload = self.decapsulate(pkt)
self.assert_eq_pkts(payload, self.frame_reply)
def test_ucast_flood(self):
""" Unicast flood test
Send frames from pg3
Verify receipt of encapsulated frames on pg0
"""
self.pg3.add_stream([self.frame_reply])
self.pg0.enable_capture()
self.pg_start()
# Get packet from each tunnel and assert it's corectly encapsulated.
out = self.pg0.get_capture()
self.assertEqual(len(out), 10,
'Invalid number of packets on '
'output: {}'.format(len(out)))
for pkt in out:
self.check_encapsulation(pkt, self.ucast_flood_bd, True)
payload = self.decapsulate(pkt)
self.assert_eq_pkts(payload, self.frame_reply)
def test_mcast_flood(self):
""" Multicast flood test
Send frames from pg2
Verify receipt of encapsulated frames on pg0
"""
self.pg2.add_stream([self.frame_reply])
self.pg0.enable_capture()
self.pg_start()
# Pick first received frame and check if it's corectly encapsulated.
out = self.pg0.get_capture()
self.assertEqual(len(out), 1,
'Invalid number of packets on '
'output: {}'.format(len(out)))
pkt = out[0]
self.check_encapsulation(pkt, self.mcast_flood_bd, True)
payload = self.decapsulate(pkt)
self.assert_eq_pkts(payload, self.frame_reply)
@staticmethod
def ipn_to_ip(ipn):
return '.'.join(str(i) for i in bytearray(ipn))
def test_mcast_rcv(self):
""" Multicast receive test
Send 20 encapsulated frames from pg0 only 10 match unicast tunnels
Verify receipt of 10 decap frames on pg2
"""
mac = self.pg0.remote_mac
ip_range_start = 10
ip_range_end = 30
mcast_stream = [
self.encap_mcast(self.frame_request, self.ipn_to_ip(ip), mac,
self.mcast_flood_bd)
for ip in self.ip4_range(self.pg0.remote_ip4n,
ip_range_start, ip_range_end)]
self.pg0.add_stream(mcast_stream)
self.pg2.enable_capture()
self.pg_start()
out = self.pg2.get_capture()
self.assertEqual(len(out), 10,
'Invalid number of packets on '
'output: {}'.format(len(out)))
for pkt in out:
self.assert_eq_pkts(pkt, self.frame_request)
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