#!/usr/bin/env python import socket from util import ip4n_range, ip4_range import unittest from framework import VppTestCase, VppTestRunner from template_bd import BridgeDomain from scapy.layers.l2 import Ether, Raw from scapy.layers.inet import IP, UDP from scapy.layers.vxlan import VXLAN from scapy.utils import atol import StringIO def reassemble(listoffragments): buffer = StringIO.StringIO() first = listoffragments[0] buffer.seek(20) for pkt in listoffragments: buffer.seek(pkt[IP].frag*8) buffer.write(pkt[IP].payload) first.len = len(buffer.getvalue()) + 20 first.flags = 0 del(first.chksum) header = str(first[IP])[:20] return first[IP].__class__(header + buffer.getvalue()) class TestVxlan(BridgeDomain, VppTestCase): """ VXLAN Test Case """ def __init__(self, *args): BridgeDomain.__init__(self) VppTestCase.__init__(self, *args) def encapsulate(self, pkt, vni): """ Encapsulate the original payload frame by adding VXLAN header with its UDP, IP and Ethernet fields """ return (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) / IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) / UDP(sport=self.dport, dport=self.dport, chksum=0) / VXLAN(vni=vni, flags=self.flags) / pkt) def ip_range(self, start, end): """ range of remote ip's """ return ip4_range(self.pg0.remote_ip4, start, end) def encap_mcast(self, pkt, src_ip, src_mac, vni): """ Encapsulate the original payload frame by adding VXLAN header with its UDP, IP and Ethernet fields """ return (Ether(src=src_mac, dst=self.mcast_mac) / IP(src=src_ip, dst=self.mcast_ip4) / UDP(sport=self.dport, dport=self.dport, chksum=0) / VXLAN(vni=vni, flags=self.flags) / pkt) def decapsulate(self, pkt): """ Decapsulate the original payload frame by removing VXLAN header """ # check if is set I flag self.assertEqual(pkt[VXLAN].flags, int('0x8', 16)) return pkt[VXLAN].payload # Method for checking VXLAN encapsulation. # def check_encapsulation(self, pkt, vni, local_only=False, mcast_pkt=False): # TODO: add error messages # Verify source MAC is VPP_MAC and destination MAC is MY_MAC resolved # by VPP using ARP. self.assertEqual(pkt[Ether].src, self.pg0.local_mac) if not local_only: if not mcast_pkt: self.assertEqual(pkt[Ether].dst, self.pg0.remote_mac) else: self.assertEqual(pkt[Ether].dst, type(self).mcast_mac) # Verify VXLAN tunnel source IP is VPP_IP and destination IP is MY_IP. self.assertEqual(pkt[IP].src, self.pg0.local_ip4) if not local_only: if not mcast_pkt: self.assertEqual(pkt[IP].dst, self.pg0.remote_ip4) else: self.assertEqual(pkt[IP].dst, type(self).mcast_ip4) # Verify UDP destination port is VXLAN 4789, source UDP port could be # arbitrary. self.assertEqual(pkt[UDP].dport, type(self).dport) # TODO: checksum check # Verify VNI self.assertEqual(pkt[VXLAN].vni, vni) @classmethod def create_vxlan_flood_test_bd(cls, vni, n_ucast_tunnels): # Create 10 ucast vxlan tunnels under bd ip_range_start = 10 ip_range_end = ip_range_start + n_ucast_tunnels next_hop_address = cls.pg0.remote_ip4n for dest_ip4n in ip4n_range(next_hop_address, ip_range_start, ip_range_end): # add host route so dest_ip4n will not be resolved cls.vapi.ip_add_del_route(dest_ip4n, 32, next_hop_address) r = cls.vapi.vxlan_add_del_tunnel( src_addr=cls.pg0.local_ip4n, dst_addr=dest_ip4n, vni=vni) cls.vapi.sw_interface_set_l2_bridge(r.sw_if_index, bd_id=vni) @classmethod def add_del_shared_mcast_dst_load(cls, is_add): """ add or del tunnels sharing the same mcast dst to test vxlan ref_count mechanism """ n_shared_dst_tunnels = 20 vni_start = 10000 vni_end = vni_start + n_shared_dst_tunnels for vni in range(vni_start, vni_end): r = cls.vapi.vxlan_add_del_tunnel( src_addr=cls.pg0.local_ip4n, dst_addr=cls.mcast_ip4n, mcast_sw_if_index=1, vni=vni, is_add=is_add) if r.sw_if_index == 0xffffffff: raise "bad sw_if_index" @classmethod def add_shared_mcast_dst_load(cls): cls.add_del_shared_mcast_dst_load(is_add=1) @classmethod def del_shared_mcast_dst_load(cls): cls.add_del_shared_mcast_dst_load(is_add=0) @classmethod def add_del_mcast_tunnels_load(cls, is_add): """ add or del tunnels to test vxlan stability """ n_distinct_dst_tunnels = 200 ip_range_start = 10 ip_range_end = ip_range_start + n_distinct_dst_tunnels for dest_ip4n in ip4n_range(cls.mcast_ip4n, ip_range_start, ip_range_end): vni = bytearray(dest_ip4n)[3] cls.vapi.vxlan_add_del_tunnel( src_addr=cls.pg0.local_ip4n, dst_addr=dest_ip4n, mcast_sw_if_index=1, vni=vni, is_add=is_add) @classmethod def add_mcast_tunnels_load(cls): cls.add_del_mcast_tunnels_load(is_add=1) @classmethod def del_mcast_tunnels_load(cls): cls.add_del_mcast_tunnels_load(is_add=0) # Class method to start the VXLAN test case. # Overrides setUpClass method in VppTestCase class. # Python try..except statement is used to ensure that the tear down of # the class will be executed even if exception is raised. # @param cls The class pointer. @classmethod def setUpClass(cls): super(TestVxlan, cls).setUpClass() try: cls.dport = 4789 cls.flags = 0x8 # Create 2 pg interfaces. cls.create_pg_interfaces(range(4)) for pg in cls.pg_interfaces: pg.admin_up() # Configure IPv4 addresses on VPP pg0. cls.pg0.config_ip4() # Resolve MAC address for VPP's IP address on pg0. cls.pg0.resolve_arp() # Our Multicast address cls.mcast_ip4 = '239.1.1.1' cls.mcast_ip4n = socket.inet_pton(socket.AF_INET, cls.mcast_ip4) iplong = atol(cls.mcast_ip4) cls.mcast_mac = "01:00:5e:%02x:%02x:%02x" % ( (iplong >> 16) & 0x7F, (iplong >> 8) & 0xFF, iplong & 0xFF) # Create VXLAN VTEP on VPP pg0, and put vxlan_tunnel0 and pg1 # into BD. cls.single_tunnel_bd = 1 r = cls.vapi.vxlan_add_del_tunnel( src_addr=cls.pg0.local_ip4n, dst_addr=cls.pg0.remote_ip4n, vni=cls.single_tunnel_bd) cls.vapi.sw_interface_set_l2_bridge(r.sw_if_index, bd_id=cls.single_tunnel_bd) cls.vapi.sw_interface_set_l2_bridge(cls.pg1.sw_if_index, bd_id=cls.single_tunnel_bd) # Setup vni 2 to test multicast flooding cls.n_ucast_tunnels = 10 cls.mcast_flood_bd = 2 cls.create_vxlan_flood_test_bd(cls.mcast_flood_bd, cls.n_ucast_tunnels) r = cls.vapi.vxlan_add_del_tunnel( src_addr=cls.pg0.local_ip4n, dst_addr=cls.mcast_ip4n, mcast_sw_if_index=1, vni=cls.mcast_flood_bd) cls.vapi.sw_interface_set_l2_bridge(r.sw_if_index, bd_id=cls.mcast_flood_bd) cls.vapi.sw_interface_set_l2_bridge(cls.pg2.sw_if_index, bd_id=cls.mcast_flood_bd) # Add and delete mcast tunnels to check stability cls.add_shared_mcast_dst_load() cls.add_mcast_tunnels_load() cls.del_shared_mcast_dst_load() cls.del_mcast_tunnels_load() # Setup vni 3 to test unicast flooding cls.ucast_flood_bd = 3 cls.create_vxlan_flood_test_bd(cls.ucast_flood_bd, cls.n_ucast_tunnels) cls.vapi.sw_interface_set_l2_bridge(cls.pg3.sw_if_index, bd_id=cls.ucast_flood_bd) except Exception: super(TestVxlan, cls).tearDownClass() raise def test_encap_big_packet(self): """ Encapsulation test send big frame from pg1 Verify receipt of encapsulated frames on pg0 """ self.vapi.sw_interface_set_mtu(self.pg0.sw_if_index, [1500, 0, 0, 0]) frame = (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' * 1450)) self.pg1.add_stream([frame]) self.pg0.enable_capture() self.pg_start() # Pick first received frame and check if it's correctly encapsulated. out = self.pg0.get_capture(2) ether = out[0] pkt = reassemble(out) pkt = ether / pkt self.check_encapsulation(pkt, self.single_tunnel_bd) payload = self.decapsulate(pkt) # TODO: Scapy bug? # self.assert_eq_pkts(payload, frame) # Method to define VPP actions before tear down of the test case. # Overrides tearDown method in VppTestCase class. # @param self The object pointer. def tearDown(self): super(TestVxlan, self).tearDown() if not self.vpp_dead: self.logger.info(self.vapi.cli("show bridge-domain 1 detail")) self.logger.info(self.vapi.cli("show bridge-domain 2 detail")) self.logger.info(self.vapi.cli("show bridge-domain 3 detail")) self.logger.info(self.vapi.cli("show vxlan tunnel")) if __name__ == '__main__': unittest.main(testRunner=VppTestRunner)