1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
|
#!/usr/bin/env python3
import unittest
from framework import VppTestCase, VppTestRunner
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP, ICMP
from scapy.layers.inet6 import IPv6
from vpp_papi import VppEnum
N_PKTS = 63
class TestURPF(VppTestCase):
""" Unicast Reverse Path Forwarding Test Case """
@classmethod
def setUpClass(cls):
super(TestURPF, cls).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestURPF, cls).tearDownClass()
def setUp(self):
super(TestURPF, self).setUp()
# create 4 pg interfaces so there are a few addresses
# in the FIB
self.create_pg_interfaces(range(4))
for i in self.pg_interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
i.config_ip6()
i.resolve_ndp()
def tearDown(self):
for i in self.pg_interfaces:
i.unconfig_ip4()
i.unconfig_ip6()
i.admin_down()
super(TestURPF, self).tearDown()
def test_urpf4(self):
""" uRPF IP4 """
e = VppEnum
p_spoof_loose = (Ether(dst=self.pg0.local_mac,
src=self.pg0.remote_mac) /
IP(src="3.3.3.3", dst=self.pg1.remote_ip4) /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100)) * N_PKTS
p_spoof_strict = (Ether(dst=self.pg0.local_mac,
src=self.pg0.remote_mac) /
IP(src=self.pg2.remote_ip4,
dst=self.pg1.remote_ip4) /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100)) * N_PKTS
p_good = (Ether(dst=self.pg0.local_mac,
src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4,
dst=self.pg1.remote_ip4) /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100)) * N_PKTS
#
# before adding the uRPF, ensure all packets are forwarded
#
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_expect(self.pg0, p_spoof_loose, self.pg1)
#
# apply loose uRPF check on pg0 rx
#
self.vapi.urpf_update(is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg0.sw_if_index)
# good packets still pass
self.send_and_expect(self.pg0, p_good, self.pg1)
# packets from address for which there is a route are forwarded
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
# packets from address to which there is no route are dropped
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip4-rx-urpf-loose/uRPF Drop",
N_PKTS)
#
# crank it up to strict mode
#
self.vapi.urpf_update(is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg0.sw_if_index)
# good packets still pass
self.send_and_expect(self.pg0, p_good, self.pg1)
# packets that would not be routed back thru pg0 are dropped
self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip4-rx-urpf-strict/uRPF Drop",
2 * N_PKTS)
#
# disable uRPF, all traffic should pass
#
self.vapi.urpf_update(is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg0.sw_if_index)
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_expect(self.pg0, p_spoof_loose, self.pg1)
#
# Now apply in the TX direction
# for loose it is the same deal, they should not be forwarded
# if there's no route
# for strict they should not be forwarded if they would be
# forwarded thru that interface.
#
self.vapi.urpf_update(is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg1.sw_if_index)
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip4-tx-urpf-loose/uRPF Drop",
N_PKTS)
self.vapi.urpf_update(is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg1.sw_if_index)
self.send_and_expect(self.pg0, p_good, self.pg1)
# the strict packet, from a peer is allowed, since it does
# not forward via pg1
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip4-tx-urpf-strict/uRPF Drop",
N_PKTS)
# change the strict packet so that it would forward through pg1
p_spoof_strict = (Ether(dst=self.pg0.local_mac,
src=self.pg0.remote_mac) /
IP(src=self.pg1.remote_ip4,
dst=self.pg1.remote_ip4) /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100)) * N_PKTS
self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
self.assert_error_counter_equal("/err/ip4-tx-urpf-strict/uRPF Drop",
2 * N_PKTS)
# cleanup
self.vapi.urpf_update(is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg1.sw_if_index)
def test_urpf6(self):
""" uRPF IP6 """
e = VppEnum
p_spoof_loose = (Ether(dst=self.pg0.local_mac,
src=self.pg0.remote_mac) /
IPv6(src="3::3", dst=self.pg1.remote_ip6) /
UDP(sport=1236, dport=1236) /
Raw(b'\xa5' * 100)) * N_PKTS
p_spoof_strict = (Ether(dst=self.pg0.local_mac,
src=self.pg0.remote_mac) /
IPv6(src=self.pg2.remote_ip6,
dst=self.pg1.remote_ip6) /
UDP(sport=1236, dport=1236) /
Raw(b'\xa5' * 100)) * N_PKTS
p_good = (Ether(dst=self.pg0.local_mac,
src=self.pg0.remote_mac) /
IPv6(src=self.pg0.remote_ip6,
dst=self.pg1.remote_ip6) /
UDP(sport=1236, dport=1236) /
Raw(b'\xa5' * 100)) * N_PKTS
#
# before adding the uRPF, ensure all packets are forwarded
#
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_expect(self.pg0, p_spoof_loose, self.pg1)
#
# apply loose uRPF check on pg0 rx
#
self.vapi.urpf_update(is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg0.sw_if_index)
# good packets still pass
self.send_and_expect(self.pg0, p_good, self.pg1)
# packets from address for which there is a route are forwarded
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
# packets from address to which there is no route are dropped
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip6-rx-urpf-loose/uRPF Drop",
N_PKTS)
#
# crank it up to strict mode
#
self.vapi.urpf_update(is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg0.sw_if_index)
# good packets still pass
self.send_and_expect(self.pg0, p_good, self.pg1)
# packets that would not be routed back thru pg0 are dropped
self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip6-rx-urpf-strict/uRPF Drop",
2 * N_PKTS)
#
# disable uRPF, all traffic should pass
#
self.vapi.urpf_update(is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg0.sw_if_index)
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_expect(self.pg0, p_spoof_loose, self.pg1)
#
# Now apply in the TX direction
# for loose it is the same deal, they should not be forwarded
# if there's no route
# for strict they should not be forwarded if they would be
# forwarded thru that interface.
#
self.vapi.urpf_update(is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg1.sw_if_index)
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip6-tx-urpf-loose/uRPF Drop",
N_PKTS)
self.vapi.urpf_update(is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg1.sw_if_index)
self.send_and_expect(self.pg0, p_good, self.pg1)
# the strict packet, from a peer is allowed, since it does
# not forward via pg1
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip6-tx-urpf-strict/uRPF Drop",
N_PKTS)
# change the strict packet so that it would forward through pg1
p_spoof_strict = (Ether(dst=self.pg0.local_mac,
src=self.pg0.remote_mac) /
IPv6(src=self.pg1.remote_ip6,
dst=self.pg1.remote_ip6) /
UDP(sport=1236, dport=1236) /
Raw(b'\xa5' * 100)) * N_PKTS
self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
self.assert_error_counter_equal("/err/ip6-tx-urpf-strict/uRPF Drop",
2 * N_PKTS)
# cleanup
self.vapi.urpf_update(is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg1.sw_if_index)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
|
