#!/usr/bin/env python import unittest from scapy.packet import Raw from scapy.layers.l2 import Ether from scapy.layers.inet import IP, UDP from framework import VppTestCase, VppTestRunner from util import Host, ppp class TestSpan(VppTestCase): """ SPAN Test Case """ # Test variables hosts_nr = 10 # Number of hosts pkts_per_burst = 257 # Number of packets per burst @classmethod def setUpClass(cls): super(TestSpan, cls).setUpClass() def setUp(self): super(TestSpan, self).setUp() # create 3 pg interfaces self.create_pg_interfaces(range(3)) # packet flows mapping pg0 -> pg1, pg2 -> pg3, etc. self.flows = dict() self.flows[self.pg0] = [self.pg1] # packet sizes self.pg_if_packet_sizes = [64, 512] # , 1518, 9018] self.interfaces = list(self.pg_interfaces) # Create host MAC and IPv4 lists # self.MY_MACS = dict() # self.MY_IP4S = dict() self.create_host_lists(TestSpan.hosts_nr) # Create bi-directional cross-connects between pg0 and pg1 self.vapi.sw_interface_set_l2_xconnect( self.pg0.sw_if_index, self.pg1.sw_if_index, enable=1) self.vapi.sw_interface_set_l2_xconnect( self.pg1.sw_if_index, self.pg0.sw_if_index, enable=1) # setup all interfaces for i in self.interfaces: i.admin_up() i.config_ip4() i.resolve_arp() # Enable SPAN on pg0 (mirrored to pg2) self.vapi.sw_interface_span_enable_disable( self.pg0.sw_if_index, self.pg2.sw_if_index) def tearDown(self): super(TestSpan, self).tearDown() def create_host_lists(self, count): """ Method to create required number of MAC and IPv4 addresses. Create required number of host MAC addresses and distribute them among interfaces. Create host IPv4 address for every host MAC address too. :param count: Number of hosts to create MAC and IPv4 addresses for. """ # mapping between packet-generator index and lists of test hosts self.hosts_by_pg_idx = dict() for pg_if in self.pg_interfaces: # self.MY_MACS[i.sw_if_index] = [] # self.MY_IP4S[i.sw_if_index] = [] self.hosts_by_pg_idx[pg_if.sw_if_index] = [] hosts = self.hosts_by_pg_idx[pg_if.sw_if_index] for j in range(0, count): host = Host( "00:00:00:ff:%02x:%02x" % (pg_if.sw_if_index, j), "172.17.1%02x.%u" % (pg_if.sw_if_index, j)) hosts.append(host) def create_stream(self, src_if, packet_sizes): pkts = [] for i in range(0, TestSpan.pkts_per_burst): dst_if = self.flows[src_if][0] pkt_info = self.create_packet_info(src_if, dst_if) payload = self.info_to_payload(pkt_info) p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) / IP(src=src_if.remote_ip4, dst=dst_if.remote_ip4) / UDP(sport=1234, dport=1234) / Raw(payload)) pkt_info.data = p.copy() size = packet_sizes[(i / 2) % len(packet_sizes)] self.extend_packet(p, size) pkts.append(p) return pkts def verify_capture(self, dst_if, capture_pg1, capture_pg2): last_info = dict() for i in self.interfaces: last_info[i.sw_if_index] = None dst_sw_if_index = dst_if.sw_if_index self.assertEqual( len(capture_pg1), len(capture_pg2), "Different number of outgoing and mirrored packets : %u != %u" % (len(capture_pg1), len(capture_pg2))) for pkt_pg1, pkt_pg2 in zip(capture_pg1, capture_pg2): try: ip1 = pkt_pg1[IP] udp1 = pkt_pg1[UDP] raw1 = pkt_pg1[Raw] if pkt_pg1[Ether] != pkt_pg2[Ether]: self.logger.error("Different ethernet header of " "outgoing and mirrored packet") raise if ip1 != pkt_pg2[IP]: self.logger.error( "Different ip header of outgoing and mirrored packet") raise if udp1 != pkt_pg2[UDP]: self.logger.error( "Different udp header of outgoing and mirrored packet") raise if raw1 != pkt_pg2[Raw]: self.logger.error( "Different raw data of outgoing and mirrored packet") raise payload_info = self.payload_to_info(str(raw1)) packet_index = payload_info.index self.assertEqual(payload_info.dst, dst_sw_if_index) self.logger.debug( "Got packet on port %s: src=%u (id=%u)" % (dst_if.name, payload_info.src, packet_index)) next_info = self.get_next_packet_info_for_interface2( payload_info.src, dst_sw_if_index, last_info[payload_info.src]) last_info[payload_info.src] = next_info self.assertTrue(next_info is not None) self.assertEqual(packet_index, next_info.index) saved_packet = next_info.data # Check standard fields self.assertEqual(ip1.src, saved_packet[IP].src) self.assertEqual(ip1.dst, saved_packet[IP].dst) self.assertEqual(udp1.sport, saved_packet[UDP].sport) self.assertEqual(udp1.dport, saved_packet[UDP].dport) except: self.logger.error("Unexpected or invalid packets:") self.logger.error(ppp("pg1 packet:", pkt_pg1)) self.logger.error(ppp("pg2 packet:", pkt_pg2)) raise for i in self.interfaces: remaining_packet = self.get_next_packet_info_for_interface2( i, dst_sw_if_index, last_info[i.sw_if_index]) self.assertTrue(remaining_packet is None, "Port %u: Packet expected from source %u didn't" " arrive" % (dst_sw_if_index, i.sw_if_index)) def test_span(self): """ SPAN test Test scenario: 1. config 3 interfaces, pg0 l2xconnected with pg1 2. sending l2 eth packets between 2 interfaces (pg0, pg1) and mirrored to pg2 64B, 512B, 1518B, 9018B (ether_size) burst of packets per interface """ # Create incoming packet streams for packet-generator interfaces pkts = self.create_stream(self.pg0, self.pg_if_packet_sizes) self.pg0.add_stream(pkts) # Enable packet capturing and start packet sending self.pg_enable_capture(self.pg_interfaces) self.pg_start() # Verify packets outgoing packet streams on mirrored interface (pg2) self.logger.info("Verifying capture on interfaces %s and %s" % (self.pg1.name, self.pg2.name)) pg2_expected = self.get_packet_count_for_if_idx(self.pg1.sw_if_index) self.verify_capture( self.pg1, self.pg1.get_capture(), self.pg2.get_capture(pg2_expected)) if __name__ == '__main__': unittest.main(testRunner=VppTestRunner)