1#!/usr/bin/env python3
2
3import socket
4from util import ip4_range
5import unittest
6from framework import VppTestCase, VppTestRunner, running_extended_tests
7from template_bd import BridgeDomain
8
9from scapy.layers.l2 import Ether
10from scapy.packet import Raw
11from scapy.layers.inet import IP, UDP
12from scapy.layers.vxlan import VXLAN
13
14import util
15from vpp_ip_route import VppIpRoute, VppRoutePath
16
17from vpp_ip import INVALID_INDEX
18
19
20@unittest.skipUnless(running_extended_tests, "part of extended tests")
21class TestVxlanGpe(BridgeDomain, VppTestCase):
22    """ VXLAN-GPE Test Case """
23
24    def __init__(self, *args):
25        BridgeDomain.__init__(self)
26        VppTestCase.__init__(self, *args)
27
28    def encapsulate(self, pkt, vni):
29        """
30        Encapsulate the original payload frame by adding VXLAN-GPE header
31        with its UDP, IP and Ethernet fields
32        """
33        return (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
34                IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
35                UDP(sport=self.dport, dport=self.dport, chksum=0) /
36                VXLAN(vni=vni, flags=self.flags) /
37                pkt)
38
39    def ip_range(self, start, end):
40        """ range of remote ip's """
41        return ip4_range(self.pg0.remote_ip4, start, end)
42
43    def encap_mcast(self, pkt, src_ip, src_mac, vni):
44        """
45        Encapsulate the original payload frame by adding VXLAN-GPE header
46        with its UDP, IP and Ethernet fields
47        """
48        return (Ether(src=src_mac, dst=self.mcast_mac) /
49                IP(src=src_ip, dst=self.mcast_ip4) /
50                UDP(sport=self.dport, dport=self.dport, chksum=0) /
51                VXLAN(vni=vni, flags=self.flags) /
52                pkt)
53
54    def decapsulate(self, pkt):
55        """
56        Decapsulate the original payload frame by removing VXLAN-GPE header
57        """
58        # check if is set I and P flag
59        self.assertEqual(pkt[VXLAN].flags, 0x0c)
60        return pkt[VXLAN].payload
61
62    # Method for checking VXLAN-GPE encapsulation.
63    #
64    def check_encapsulation(self, pkt, vni, local_only=False, mcast_pkt=False):
65        # Verify source MAC is VPP_MAC and destination MAC is MY_MAC resolved
66        #  by VPP using ARP.
67        self.assertEqual(pkt[Ether].src, self.pg0.local_mac)
68        if not local_only:
69            if not mcast_pkt:
70                self.assertEqual(pkt[Ether].dst, self.pg0.remote_mac)
71            else:
72                self.assertEqual(pkt[Ether].dst, type(self).mcast_mac)
73        # Verify VXLAN-GPE tunnel src IP is VPP_IP and dst IP is MY_IP.
74        self.assertEqual(pkt[IP].src, self.pg0.local_ip4)
75        if not local_only:
76            if not mcast_pkt:
77                self.assertEqual(pkt[IP].dst, self.pg0.remote_ip4)
78            else:
79                self.assertEqual(pkt[IP].dst, type(self).mcast_ip4)
80        # Verify UDP destination port is VXLAN-GPE 4790, source UDP port
81        #  could be arbitrary.
82        self.assertEqual(pkt[UDP].dport, type(self).dport)
83        # Verify UDP checksum
84        self.assert_udp_checksum_valid(pkt)
85        # Verify VNI
86        self.assertEqual(pkt[VXLAN].vni, vni)
87
88    @classmethod
89    def create_vxlan_gpe_flood_test_bd(cls, vni, n_ucast_tunnels):
90        # Create 10 ucast vxlan tunnels under bd
91        ip_range_start = 10
92        ip_range_end = ip_range_start + n_ucast_tunnels
93        next_hop_address = cls.pg0.remote_ip4
94        for dest_ip4 in ip4_range(next_hop_address, ip_range_start,
95                                  ip_range_end):
96            # add host route so dest_ip4n will not be resolved
97            rip = VppIpRoute(cls, dest_ip4, 32,
98                             [VppRoutePath(next_hop_address,
99                                           INVALID_INDEX)],
100                             register=False)
101            rip.add_vpp_config()
102
103            r = cls.vapi.vxlan_gpe_add_del_tunnel(
104                src_addr=cls.pg0.local_ip4,
105                dst_addr=dest_ip4,
106                vni=vni)
107            cls.vapi.sw_interface_set_l2_bridge(rx_sw_if_index=r.sw_if_index,
108                                                bd_id=vni)
109
110    @classmethod
111    def add_del_shared_mcast_dst_load(cls, is_add):
112        """
113        add or del tunnels sharing the same mcast dst
114        to test vxlan_gpe ref_count mechanism
115        """
116        n_shared_dst_tunnels = 20
117        vni_start = 1000
118        vni_end = vni_start + n_shared_dst_tunnels
119        for vni in range(vni_start, vni_end):
120            r = cls.vapi.vxlan_gpe_add_del_tunnel(
121                local=cls.pg0.local_ip4,
122                remote=cls.mcast_ip4,
123                mcast_sw_if_index=1,
124                vni=vni,
125                is_add=is_add)
126            if r.sw_if_index == 0xffffffff:
127                raise ValueError("bad sw_if_index: ~0")
128
129    @classmethod
130    def add_shared_mcast_dst_load(cls):
131        cls.add_del_shared_mcast_dst_load(is_add=1)
132
133    @classmethod
134    def del_shared_mcast_dst_load(cls):
135        cls.add_del_shared_mcast_dst_load(is_add=0)
136
137    @classmethod
138    def add_del_mcast_tunnels_load(cls, is_add):
139        """
140        add or del tunnels to test vxlan_gpe stability
141        """
142        n_distinct_dst_tunnels = 20
143        ip_range_start = 10
144        ip_range_end = ip_range_start + n_distinct_dst_tunnels
145        for dest_ip4 in ip4_range(cls.mcast_ip4, ip_range_start,
146                                  ip_range_end):
147            vni = int(dest_ip4.split(".")[3])
148            cls.vapi.vxlan_gpe_add_del_tunnel(
149                src_addr=cls.pg0.local_ip4,
150                dst_addr=dest_ip4,
151                mcast_sw_if_index=1,
152                vni=vni,
153                is_add=is_add)
154
155    @classmethod
156    def add_mcast_tunnels_load(cls):
157        cls.add_del_mcast_tunnels_load(is_add=1)
158
159    @classmethod
160    def del_mcast_tunnels_load(cls):
161        cls.add_del_mcast_tunnels_load(is_add=0)
162
163    # Class method to start the VXLAN-GPE test case.
164    #  Overrides setUpClass method in VppTestCase class.
165    #  Python try..except statement is used to ensure that the tear down of
166    #  the class will be executed even if exception is raised.
167    #  @param cls The class pointer.
168    @classmethod
169    def setUpClass(cls):
170        super(TestVxlanGpe, cls).setUpClass()
171
172        try:
173            cls.dport = 4790
174            cls.flags = 0x0c
175
176            # Create 2 pg interfaces.
177            cls.create_pg_interfaces(range(4))
178            for pg in cls.pg_interfaces:
179                pg.admin_up()
180
181            # Configure IPv4 addresses on VPP pg0.
182            cls.pg0.config_ip4()
183
184            # Resolve MAC address for VPP's IP address on pg0.
185            cls.pg0.resolve_arp()
186
187            # Our Multicast address
188            cls.mcast_ip4 = '239.1.1.1'
189            cls.mcast_mac = util.mcast_ip_to_mac(cls.mcast_ip4)
190
191            # Create VXLAN-GPE VTEP on VPP pg0, and put vxlan_gpe_tunnel0
192            # and pg1 into BD.
193            cls.single_tunnel_vni = 0xabcde
194            cls.single_tunnel_bd = 11
195            r = cls.vapi.vxlan_gpe_add_del_tunnel(
196                src_addr=cls.pg0.local_ip4,
197                dst_addr=cls.pg0.remote_ip4,
198                vni=cls.single_tunnel_vni)
199            cls.vapi.sw_interface_set_l2_bridge(rx_sw_if_index=r.sw_if_index,
200                                                bd_id=cls.single_tunnel_bd)
201            cls.vapi.sw_interface_set_l2_bridge(
202                rx_sw_if_index=cls.pg1.sw_if_index, bd_id=cls.single_tunnel_bd)
203
204            # Setup vni 2 to test multicast flooding
205            cls.n_ucast_tunnels = 10
206            cls.mcast_flood_bd = 12
207            cls.create_vxlan_gpe_flood_test_bd(cls.mcast_flood_bd,
208                                               cls.n_ucast_tunnels)
209            r = cls.vapi.vxlan_gpe_add_del_tunnel(
210                src_addr=cls.pg0.local_ip4,
211                dst_addr=cls.mcast_ip4,
212                mcast_sw_if_index=1,
213                vni=cls.mcast_flood_bd)
214            cls.vapi.sw_interface_set_l2_bridge(rx_sw_if_index=r.sw_if_index,
215                                                bd_id=cls.mcast_flood_bd)
216            cls.vapi.sw_interface_set_l2_bridge(
217                rx_sw_if_index=cls.pg2.sw_if_index, bd_id=cls.mcast_flood_bd)
218
219            # Add and delete mcast tunnels to check stability
220            cls.add_shared_mcast_dst_load()
221            cls.add_mcast_tunnels_load()
222            cls.del_shared_mcast_dst_load()
223            cls.del_mcast_tunnels_load()
224
225            # Setup vni 3 to test unicast flooding
226            cls.ucast_flood_bd = 13
227            cls.create_vxlan_gpe_flood_test_bd(cls.ucast_flood_bd,
228                                               cls.n_ucast_tunnels)
229            cls.vapi.sw_interface_set_l2_bridge(
230                rx_sw_if_index=cls.pg3.sw_if_index, bd_id=cls.ucast_flood_bd)
231        except Exception:
232            super(TestVxlanGpe, cls).tearDownClass()
233            raise
234
235    @classmethod
236    def tearDownClass(cls):
237        super(TestVxlanGpe, cls).tearDownClass()
238
239    @unittest.skip("test disabled for vxlan-gpe")
240    def test_mcast_flood(self):
241        """ inherited from BridgeDomain """
242        pass
243
244    @unittest.skip("test disabled for vxlan-gpe")
245    def test_mcast_rcv(self):
246        """ inherited from BridgeDomain """
247        pass
248
249    # Method to define VPP actions before tear down of the test case.
250    #  Overrides tearDown method in VppTestCase class.
251    #  @param self The object pointer.
252    def tearDown(self):
253        super(TestVxlanGpe, self).tearDown()
254
255    def show_commands_at_teardown(self):
256        self.logger.info(self.vapi.cli("show bridge-domain 11 detail"))
257        self.logger.info(self.vapi.cli("show bridge-domain 12 detail"))
258        self.logger.info(self.vapi.cli("show bridge-domain 13 detail"))
259        self.logger.info(self.vapi.cli("show int"))
260        self.logger.info(self.vapi.cli("show vxlan-gpe"))
261        self.logger.info(self.vapi.cli("show trace"))
262
263
264if __name__ == '__main__':
265    unittest.main(testRunner=VppTestRunner)
266