test/template_bd.py

   1 #!/usr/bin/env python
   2
   3 from abc import abstractmethod
   4
   5 from scapy.layers.l2 import Ether, Raw
   6 from scapy.layers.inet import IP, UDP
   7
   8
   9 class BridgeDomain(object):
  10     """ Bridge domain abstraction """
  11
  12     @property
  13     def frame_pg0_to_pg1(self):
  14         """ Ethernet frame sent from pg0 and expected to arrive at pg1 """
  15         return (Ether(src='00:00:00:00:00:01', dst='00:00:00:00:00:02') /
  16                 IP(src='1.2.3.4', dst='4.3.2.1') /
  17                 UDP(sport=10000, dport=20000) /
  18                 Raw('\xa5' * 100))
  19
  20     @property
  21     def frame_pg1_to_pg0(self):
  22         """ Ethernet frame sent from pg1 and expected to arrive at pg0 """
  23         return (Ether(src='00:00:00:00:00:02', dst='00:00:00:00:00:01') /
  24                 IP(src='4.3.2.1', dst='1.2.3.4') /
  25                 UDP(sport=20000, dport=10000) /
  26                 Raw('\xa5' * 100))
  27
  28     @abstractmethod
  29     def encapsulate(self, pkt):
  30         """ Encapsulate packet """
  31         pass
  32
  33     @abstractmethod
  34     def decapsulate(self, pkt):
  35         """ Decapsulate packet """
  36         pass
  37
  38     @abstractmethod
  39     def check_encapsulation(self, pkt):
  40         """ Verify the encapsulation """
  41         pass
  42
  43     def test_decap(self):
  44         """ Decapsulation test
  45         Send encapsulated frames from pg0
  46         Verify receipt of decapsulated frames on pg1
  47         """
  48
  49         encapsulated_pkt = self.encapsulate(self.frame_pg0_to_pg1)
  50
  51         self.pg0.add_stream([encapsulated_pkt, ])
  52
  53         self.pg1.enable_capture()
  54
  55         self.pg_start()
  56
  57         # Pick first received frame and check if it's the non-encapsulated frame
  58         out = self.pg1.get_capture()
  59         self.assertEqual(len(out), 1,
  60                          'Invalid number of packets on '
  61                          'output: {}'.format(len(out)))
  62         pkt = out[0]
  63
  64         # TODO: add error messages
  65         self.assertEqual(pkt[Ether].src, self.frame_pg0_to_pg1[Ether].src)
  66         self.assertEqual(pkt[Ether].dst, self.frame_pg0_to_pg1[Ether].dst)
  67         self.assertEqual(pkt[IP].src, self.frame_pg0_to_pg1[IP].src)
  68         self.assertEqual(pkt[IP].dst, self.frame_pg0_to_pg1[IP].dst)
  69         self.assertEqual(pkt[UDP].sport, self.frame_pg0_to_pg1[UDP].sport)
  70         self.assertEqual(pkt[UDP].dport, self.frame_pg0_to_pg1[UDP].dport)
  71         self.assertEqual(pkt[Raw], self.frame_pg0_to_pg1[Raw])
  72
  73     def test_encap(self):
  74         """ Encapsulation test
  75         Send frames from pg1
  76         Verify receipt of encapsulated frames on pg0
  77         """
  78         self.pg1.add_stream([self.frame_pg1_to_pg0])
  79
  80         self.pg0.enable_capture()
  81
  82         self.pg_start()
  83
  84         # Pick first received frame and check if it's corectly encapsulated.
  85         out = self.pg0.get_capture()
  86         self.assertEqual(len(out), 1,
  87                          'Invalid number of packets on '
  88                          'output: {}'.format(len(out)))
  89         pkt = out[0]
  90         self.check_encapsulation(pkt)
  91
  92         payload = self.decapsulate(pkt)
  93         # TODO: add error messages
  94         self.assertEqual(payload[Ether].src, self.frame_pg1_to_pg0[Ether].src)
  95         self.assertEqual(payload[Ether].dst, self.frame_pg1_to_pg0[Ether].dst)
  96         self.assertEqual(payload[IP].src, self.frame_pg1_to_pg0[IP].src)
  97         self.assertEqual(payload[IP].dst, self.frame_pg1_to_pg0[IP].dst)
  98         self.assertEqual(payload[UDP].sport, self.frame_pg1_to_pg0[UDP].sport)
  99         self.assertEqual(payload[UDP].dport, self.frame_pg1_to_pg0[UDP].dport)
 100         self.assertEqual(payload[Raw], self.frame_pg1_to_pg0[Raw])