#!/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)