summaryrefslogtreecommitdiffstats
path: root/test/test_nat44_ed_output.py
blob: dbf1dc40a7501f540ea54bb40930fec1e948a83b (plain)
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
#!/usr/bin/env python3
"""NAT44 ED output-feature tests"""

import random
import unittest
from scapy.layers.inet import Ether, IP, TCP
from scapy.packet import Raw
from scapy.data import IP_PROTOS
from framework import VppTestCase
from asfframework import VppTestRunner
from vpp_papi import VppEnum


def get_nat44_ed_in2out_worker_index(ip, vpp_worker_count):
    if 0 == vpp_worker_count:
        return 0
    numeric = socket.inet_aton(ip)
    numeric = struct.unpack("!L", numeric)[0]
    numeric = socket.htonl(numeric)
    h = numeric + (numeric >> 8) + (numeric >> 16) + (numeric >> 24)
    return 1 + h % vpp_worker_count


class TestNAT44EDOutput(VppTestCase):
    """NAT44 ED output feature Test Case"""

    max_sessions = 1024

    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        cls.create_pg_interfaces(range(2))
        cls.interfaces = list(cls.pg_interfaces)

    @classmethod
    def tearDownClass(cls):
        super().tearDownClass()

    def setUp(self):
        super().setUp()
        for i in self.interfaces:
            i.admin_up()
            i.config_ip4()
            i.resolve_arp()
        self.vapi.nat44_ed_plugin_enable_disable(sessions=self.max_sessions, enable=1)

    def tearDown(self):
        if not self.vpp_dead:
            self.logger.debug(self.vapi.cli("show nat44 sessions"))
        super().tearDown()
        if not self.vpp_dead:
            for i in self.pg_interfaces:
                i.unconfig_ip4()
                i.admin_down()
            self.vapi.nat44_ed_plugin_enable_disable(enable=0)

    def test_static_dynamic(self):
        """Create static mapping which matches existing dynamic mapping"""

        config = self.vapi.nat44_show_running_config()
        old_timeouts = config.timeouts
        new_transitory = 2
        self.vapi.nat_set_timeouts(
            udp=old_timeouts.udp,
            tcp_established=old_timeouts.tcp_established,
            icmp=old_timeouts.icmp,
            tcp_transitory=new_transitory,
        )

        local_host = self.pg0.remote_ip4
        remote_host = self.pg1.remote_ip4
        nat_intf = self.pg1
        outside_addr = nat_intf.local_ip4

        self.vapi.nat44_add_del_address_range(
            first_ip_address=outside_addr,
            last_ip_address=outside_addr,
            vrf_id=0xFFFFFFFF,
            is_add=1,
            flags=0,
        )
        self.vapi.nat44_interface_add_del_feature(
            sw_if_index=self.pg0.sw_if_index, is_add=1
        )
        self.vapi.nat44_interface_add_del_feature(
            sw_if_index=self.pg0.sw_if_index,
            flags=VppEnum.vl_api_nat_config_flags_t.NAT_IS_INSIDE,
            is_add=1,
        )
        self.vapi.nat44_ed_add_del_output_interface(
            sw_if_index=self.pg1.sw_if_index, is_add=1
        )

        thread_index = get_nat44_ed_in2out_worker_index(
            local_host, self.vpp_worker_count
        )
        port_per_thread = int((0xFFFF - 1024) / max(1, self.vpp_worker_count))
        local_sport = 1024 + random.randint(1, port_per_thread)
        if self.vpp_worker_count > 0:
            local_sport += port_per_thread * (thread_index - 1)

        remote_dport = 10000

        pg0 = self.pg0
        pg1 = self.pg1

        # first setup a dynamic TCP session

        # SYN packet in->out
        p = (
            Ether(src=pg0.remote_mac, dst=pg0.local_mac)
            / IP(src=local_host, dst=remote_host)
            / TCP(sport=local_sport, dport=remote_dport, flags="S")
        )
        p = self.send_and_expect(pg0, [p], pg1)[0]

        self.assertEqual(p[IP].src, outside_addr)
        self.assertEqual(p[TCP].sport, local_sport)
        outside_port = p[TCP].sport

        # SYN+ACK packet out->in
        p = (
            Ether(src=pg1.remote_mac, dst=pg1.local_mac)
            / IP(src=remote_host, dst=outside_addr)
            / TCP(sport=remote_dport, dport=outside_port, flags="SA")
        )
        self.send_and_expect(pg1, [p], pg0)

        # ACK packet in->out
        p = (
            Ether(src=pg0.remote_mac, dst=pg0.local_mac)
            / IP(src=local_host, dst=remote_host)
            / TCP(sport=local_sport, dport=remote_dport, flags="A")
        )
        self.send_and_expect(pg0, [p], pg1)

        # now we have a session up, create a conflicting static mapping
        self.vapi.nat44_add_del_static_mapping(
            is_add=1,
            local_ip_address=local_host,
            external_ip_address=outside_addr,
            external_sw_if_index=0xFFFFFFFF,
            local_port=local_sport,
            external_port=outside_port,
            protocol=IP_PROTOS.tcp,
            flags=VppEnum.vl_api_nat_config_flags_t.NAT_IS_OUT2IN_ONLY,
        )

        sessions = self.vapi.nat44_user_session_dump(local_host, 0)
        self.assertEqual(1, len(sessions))

        # now send some more data over existing session - it should pass

        # in->out
        p = (
            Ether(src=pg0.remote_mac, dst=pg0.local_mac)
            / IP(src=local_host, dst=remote_host)
            / TCP(sport=local_sport, dport=remote_dport)
            / Raw("zippity zap")
        )
        self.send_and_expect(pg0, [p], pg1)

        # out->in
        p = (
            Ether(src=pg1.remote_mac, dst=pg1.local_mac)
            / IP(src=remote_host, dst=outside_addr)
            / TCP(sport=remote_dport, dport=outside_port)
            / Raw("flippity flop")
        )
        self.send_and_expect(pg1, [p], pg0)

        # now close the session

        # FIN packet in -> out
        p = (
            Ether(src=pg0.remote_mac, dst=pg0.local_mac)
            / IP(src=local_host, dst=remote_host)
            / TCP(sport=local_sport, dport=remote_dport, flags="FA", seq=100, ack=300)
        )
        self.send_and_expect(pg0, [p], pg1)

        # FIN+ACK packet out -> in
        p = (
            Ether(src=pg1.remote_mac, dst=pg1.local_mac)
            / IP(src=remote_host, dst=outside_addr)
            / TCP(sport=remote_dport, dport=outside_port, flags="FA", seq=300, ack=101)
        )
        self.send_and_expect(pg1, [p], pg0)

        # ACK packet in -> out
        p = (
            Ether(src=pg0.remote_mac, dst=pg0.local_mac)
            / IP(src=local_host, dst=remote_host)
            / TCP(sport=local_sport, dport=remote_dport, flags="A", seq=101, ack=301)
        )
        self.send_and_expect(pg0, [p], pg1)

        # session now in transitory timeout
        # try SYN packet in->out - should be dropped
        p = (
            Ether(src=pg0.remote_mac, dst=pg0.local_mac)
            / IP(src=local_host, dst=remote_host)
            / TCP(sport=local_sport, dport=remote_dport, flags="S")
        )
        pg0.add_stream(p)
        self.pg_enable_capture()
        self.pg_start()

        self.sleep(new_transitory, "wait for transitory timeout")
        pg0.assert_nothing_captured(0)

        # session should still exist
        sessions = self.vapi.nat44_user_session_dump(pg0.remote_ip4, 0)
        self.assertEqual(1, len(sessions))

        # send FIN+ACK packet in->out - will cause session to be wiped
        # but won't create a new session
        p = (
            Ether(src=pg1.remote_mac, dst=pg1.local_mac)
            / IP(src=local_host, dst=remote_host)
            / TCP(sport=local_sport, dport=remote_dport, flags="FA", seq=300, ack=101)
        )
        pg1.add_stream(p)
        self.pg_enable_capture()
        self.pg_start()
        pg0.assert_nothing_captured(0)

        sessions = self.vapi.nat44_user_session_dump(pg0.remote_ip4, 0)
        self.assertEqual(0, len(sessions))

        # create a new session and make sure the outside port is remapped
        # SYN packet in->out

        p = (
            Ether(src=pg0.remote_mac, dst=pg0.local_mac)
            / IP(src=local_host, dst=remote_host)
            / TCP(sport=local_sport, dport=remote_dport, flags="S")
        )
        p = self.send_and_expect(pg0, [p], pg1)[0]

        self.assertEqual(p[IP].src, outside_addr)
        self.assertNotEqual(p[TCP].sport, local_sport)

        # make sure static mapping works and creates a new session
        # SYN packet out->in
        p = (
            Ether(src=pg1.remote_mac, dst=pg1.local_mac)
            / IP(src=remote_host, dst=outside_addr)
            / TCP(sport=remote_dport, dport=outside_port, flags="S")
        )
        self.send_and_expect(pg1, [p], pg0)

        sessions = self.vapi.nat44_user_session_dump(pg0.remote_ip4, 0)
        self.assertEqual(2, len(sessions))


if __name__ == "__main__":
    unittest.main(testRunner=VppTestRunner)