#!/usr/bin/env python3 import socket from util import ip4_range, reassemble4_ether import unittest from framework import VppTestCase, VppTestRunner from template_bd import BridgeDomain from scapy.layers.l2 import Ether from scapy.packet import Raw from scapy.layers.inet import IP, UDP from scapy.layers.vxlan import VXLAN from vpp_ip_route import VppIpRoute, VppRoutePath from vpp_ip import INVALID_INDEX class TestVxlanGbp(VppTestCase): """VXLAN GBP Test Case""" @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(b"\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(b"\xa5" * 100) ) def encapsulate(self, pkt, vni): """ Encapsulate the original payload frame by adding VXLAN GBP 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, gpflags=self.gpflags, gpid=self.sclass) / pkt ) def ip_range(self, start, end): """range of remote ip's""" return ip4_range(self.pg0.remote_ip4, start, end) def decapsulate(self, pkt): """ Decapsulate the original payload frame by removing VXLAN header """ # check if is set G and I flag self.assertEqual(pkt[VXLAN].flags, int("0x88", 16)) return pkt[VXLAN].payload # Method for checking VXLAN GBP 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 GBP 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 GBP 48879, source UDP port could # be arbitrary. self.assertEqual(pkt[UDP].dport, type(self).dport) # Verify UDP checksum self.assert_udp_checksum_valid(pkt) # Verify VNI # pkt.show() self.assertEqual(pkt[VXLAN].vni, vni) # Verify Source Class self.assertEqual(pkt[VXLAN].gpid, 0) @classmethod def create_vxlan_gbp_flood_test_bd(cls, vni, n_ucast_tunnels): # Create 2 ucast vxlan tunnels under bd ip_range_start = 10 ip_range_end = ip_range_start + n_ucast_tunnels next_hop_address = cls.pg0.remote_ip4 for dest_ip4 in ip4_range(cls.pg0.remote_ip4, ip_range_start, ip_range_end): # add host route so dest_ip4 will not be resolved rip = VppIpRoute( cls, dest_ip4, 32, [VppRoutePath(next_hop_address, INVALID_INDEX)], register=False, ) rip.add_vpp_config() r = cls.vapi.vxlan_gbp_tunnel_add_del( tunnel={ "src": cls.pg0.local_ip4, "dst": dest_ip4, "vni": vni, "instance": INVALID_INDEX, "mcast_sw_if_index": INVALID_INDEX, "mode": 1, }, is_add=1, ) cls.vapi.sw_interface_set_l2_bridge(rx_sw_if_index=r.sw_if_index, bd_id=vni) # Class method to start the VXLAN GBP 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(TestVxlanGbp, cls).setUpClass() try: cls.dport = 48879 cls.flags = 0x88 cls.gpflags = 0x0 cls.sclass = 0 # 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() # Create VXLAN GBP VTEP on VPP pg0, and put vxlan_gbp_tunnel0 and # pg1 into BD. cls.single_tunnel_bd = 1 cls.single_tunnel_vni = 0xABCDE r = cls.vapi.vxlan_gbp_tunnel_add_del( tunnel={ "src": cls.pg0.local_ip4, "dst": cls.pg0.remote_ip4, "vni": cls.single_tunnel_vni, "instance": INVALID_INDEX, "mcast_sw_if_index": INVALID_INDEX, "mode": 1, }, is_add=1, ) cls.vapi.sw_interface_set_l2_bridge( rx_sw_if_index=r.sw_if_index, bd_id=cls.single_tunnel_bd ) cls.vapi.sw_interface_set_l2_bridge( rx_sw_if_index=cls.pg1.sw_if_index, bd_id=cls.single_tunnel_bd ) # Setup vni 2 to test multicast flooding cls.n_ucast_tunnels = 2 # Setup vni 3 to test unicast flooding cls.ucast_flood_bd = 3 cls.create_vxlan_gbp_flood_test_bd(cls.ucast_flood_bd, cls.n_ucast_tunnels) cls.vapi.sw_interface_set_l2_bridge( rx_sw_if_index=cls.pg3.sw_if_index, bd_id=cls.ucast_flood_bd ) except Exception: super(TestVxlanGbp, cls).tearDownClass() raise @classmethod def tearDownClass(cls): super(TestVxlanGbp, cls).tearDownClass() 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_vni) 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(1) 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 correctly encapsulated. out = self.pg0.get_capture(1) pkt = out[0] self.check_encapsulation(pkt, self.single_tunnel_vni) 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 correctly encapsulated. out = self.pg0.get_capture(self.n_ucast_tunnels) 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_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(b"\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) pkt = reassemble4_ether(out) self.check_encapsulation(pkt, self.single_tunnel_vni) payload = self.decapsulate(pkt) 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(TestVxlanGbp, self).tearDown() def show_commands_at_teardown(self): self.logger.info(self.vapi.cli("show bridge-domain 1 detail")) self.logger.info(self.vapi.cli("show bridge-domain 3 detail")) self.logger.info(self.vapi.cli("show vxlan-gbp tunnel")) self.logger.info(self.vapi.cli("show error")) if __name__ == "__main__": unittest.main(testRunner=VppTestRunner)