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
|
#!/usr/bin/env python3
#
# Copyright (C) 2022 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import unittest
import time
from base_vyostest_shim import VyOSUnitTestSHIM
from vyos.configsession import ConfigSessionError
from vyos.ifconfig import Section
from vyos.util import call
from vyos.util import cmd
base_path = ['load-balancing']
def create_netns(name):
return call(f'sudo ip netns add {name}')
def create_veth_pair(local='veth0', peer='ceth0'):
return call(f'sudo ip link add {local} type veth peer name {peer}')
def move_interface_to_netns(iface, netns_name):
return call(f'sudo ip link set {iface} netns {netns_name}')
def rename_interface(iface, new_name):
return call(f'sudo ip link set {iface} name {new_name}')
def cmd_in_netns(netns, cmd):
return call(f'sudo ip netns exec {netns} {cmd}')
def delete_netns(name):
return call(f'sudo ip netns del {name}')
class TestLoadBalancingWan(VyOSUnitTestSHIM.TestCase):
@classmethod
def setUpClass(cls):
super(TestLoadBalancingWan, cls).setUpClass()
# ensure we can also run this test on a live system - so lets clean
# out the current configuration :)
cls.cli_delete(cls, base_path)
def tearDown(self):
self.cli_delete(base_path)
self.cli_commit()
def test_table_routes(self):
ns1 = 'ns201'
ns2 = 'ns202'
ns3 = 'ns203'
iface1 = 'eth201'
iface2 = 'eth202'
iface3 = 'eth203'
container_iface1 = 'ceth0'
container_iface2 = 'ceth1'
container_iface3 = 'ceth2'
# Create network namespeces
create_netns(ns1)
create_netns(ns2)
create_netns(ns3)
create_veth_pair(iface1, container_iface1)
create_veth_pair(iface2, container_iface2)
create_veth_pair(iface3, container_iface3)
move_interface_to_netns(container_iface1, ns1)
move_interface_to_netns(container_iface2, ns2)
move_interface_to_netns(container_iface3, ns3)
call(f'sudo ip address add 203.0.113.10/24 dev {iface1}')
call(f'sudo ip address add 192.0.2.10/24 dev {iface2}')
call(f'sudo ip address add 198.51.100.10/24 dev {iface3}')
call(f'sudo ip link set dev {iface1} up')
call(f'sudo ip link set dev {iface2} up')
call(f'sudo ip link set dev {iface3} up')
cmd_in_netns(ns1, f'ip link set {container_iface1} name eth0')
cmd_in_netns(ns2, f'ip link set {container_iface2} name eth0')
cmd_in_netns(ns3, f'ip link set {container_iface3} name eth0')
cmd_in_netns(ns1, 'ip address add 203.0.113.1/24 dev eth0')
cmd_in_netns(ns2, 'ip address add 192.0.2.1/24 dev eth0')
cmd_in_netns(ns3, 'ip address add 198.51.100.1/24 dev eth0')
cmd_in_netns(ns1, 'ip link set dev eth0 up')
cmd_in_netns(ns2, 'ip link set dev eth0 up')
cmd_in_netns(ns3, 'ip link set dev eth0 up')
# Set load-balancing configuration
self.cli_set(base_path + ['wan', 'interface-health', iface1, 'failure-count', '2'])
self.cli_set(base_path + ['wan', 'interface-health', iface1, 'nexthop', '203.0.113.1'])
self.cli_set(base_path + ['wan', 'interface-health', iface1, 'success-count', '1'])
self.cli_set(base_path + ['wan', 'interface-health', iface2, 'failure-count', '2'])
self.cli_set(base_path + ['wan', 'interface-health', iface2, 'nexthop', '192.0.2.1'])
self.cli_set(base_path + ['wan', 'interface-health', iface2, 'success-count', '1'])
self.cli_set(base_path + ['wan', 'rule', '10', 'inbound-interface', iface3])
self.cli_set(base_path + ['wan', 'rule', '10', 'source', 'address', '198.51.100.0/24'])
# commit changes
self.cli_commit()
time.sleep(5)
# Check default routes in tables 201, 202
# Expected values
original = 'default via 203.0.113.1 dev eth201'
tmp = cmd('sudo ip route show table 201')
self.assertEqual(tmp, original)
original = 'default via 192.0.2.1 dev eth202'
tmp = cmd('sudo ip route show table 202')
self.assertEqual(tmp, original)
# Delete veth interfaces and netns
for iface in [iface1, iface2, iface3, container_iface1, container_iface2, container_iface3]:
call(f'sudo ip link del dev {iface}')
delete_netns(ns1)
delete_netns(ns2)
def test_check_chains(self):
ns1 = 'nsA'
ns2 = 'nsB'
ns3 = 'nsC'
iface1 = 'veth1'
iface2 = 'veth2'
iface3 = 'veth3'
container_iface1 = 'ceth0'
container_iface2 = 'ceth1'
container_iface3 = 'ceth2'
mangle_isp1 = """table ip mangle {
chain ISP_veth1 {
counter ct mark set 0xc9
counter meta mark set 0xc9
counter accept
}
}"""
mangle_isp2 = """table ip mangle {
chain ISP_veth2 {
counter ct mark set 0xca
counter meta mark set 0xca
counter accept
}
}"""
mangle_prerouting = """table ip mangle {
chain PREROUTING {
type filter hook prerouting priority mangle; policy accept;
counter jump WANLOADBALANCE_PRE
}
}"""
mangle_wanloadbalance_pre = """table ip mangle {
chain WANLOADBALANCE_PRE {
iifname "veth3" ip saddr 198.51.100.0/24 ct state new counter jump ISP_veth1
iifname "veth3" ip saddr 198.51.100.0/24 ct state new counter jump ISP_veth2
iifname "veth3" ip saddr 198.51.100.0/24 counter meta mark set ct mark
}
}"""
nat_wanloadbalance = """table ip nat {
chain WANLOADBALANCE {
ct mark 0xc9 counter snat to 203.0.113.10
ct mark 0xca counter snat to 192.0.2.10
}
}"""
nat_vyos_pre_snat_hook = """table ip nat {
chain VYOS_PRE_SNAT_HOOK {
type nat hook postrouting priority srcnat - 1; policy accept;
counter jump WANLOADBALANCE
return
}
}"""
# Create network namespeces
create_netns(ns1)
create_netns(ns2)
create_netns(ns3)
create_veth_pair(iface1, container_iface1)
create_veth_pair(iface2, container_iface2)
create_veth_pair(iface3, container_iface3)
move_interface_to_netns(container_iface1, ns1)
move_interface_to_netns(container_iface2, ns2)
move_interface_to_netns(container_iface3, ns3)
call(f'sudo ip address add 203.0.113.10/24 dev {iface1}')
call(f'sudo ip address add 192.0.2.10/24 dev {iface2}')
call(f'sudo ip address add 198.51.100.10/24 dev {iface3}')
for iface in [iface1, iface2, iface3]:
call(f'sudo ip link set dev {iface} up')
cmd_in_netns(ns1, f'ip link set {container_iface1} name eth0')
cmd_in_netns(ns2, f'ip link set {container_iface2} name eth0')
cmd_in_netns(ns3, f'ip link set {container_iface3} name eth0')
cmd_in_netns(ns1, 'ip address add 203.0.113.1/24 dev eth0')
cmd_in_netns(ns2, 'ip address add 192.0.2.1/24 dev eth0')
cmd_in_netns(ns3, 'ip address add 198.51.100.1/24 dev eth0')
cmd_in_netns(ns1, 'ip link set dev eth0 up')
cmd_in_netns(ns2, 'ip link set dev eth0 up')
cmd_in_netns(ns3, 'ip link set dev eth0 up')
# Set load-balancing configuration
self.cli_set(base_path + ['wan', 'interface-health', iface1, 'failure-count', '2'])
self.cli_set(base_path + ['wan', 'interface-health', iface1, 'nexthop', '203.0.113.1'])
self.cli_set(base_path + ['wan', 'interface-health', iface1, 'success-count', '1'])
self.cli_set(base_path + ['wan', 'interface-health', iface2, 'failure-count', '2'])
self.cli_set(base_path + ['wan', 'interface-health', iface2, 'nexthop', '192.0.2.1'])
self.cli_set(base_path + ['wan', 'interface-health', iface2, 'success-count', '1'])
self.cli_set(base_path + ['wan', 'rule', '10', 'inbound-interface', iface3])
self.cli_set(base_path + ['wan', 'rule', '10', 'source', 'address', '198.51.100.0/24'])
self.cli_set(base_path + ['wan', 'rule', '10', 'interface', iface1])
self.cli_set(base_path + ['wan', 'rule', '10', 'interface', iface2])
# commit changes
self.cli_commit()
time.sleep(5)
# Check mangle chains
tmp = cmd(f'sudo nft -s list chain mangle ISP_{iface1}')
self.assertEqual(tmp, mangle_isp1)
tmp = cmd(f'sudo nft -s list chain mangle ISP_{iface2}')
self.assertEqual(tmp, mangle_isp2)
tmp = cmd(f'sudo nft -s list chain mangle PREROUTING')
self.assertEqual(tmp, mangle_prerouting)
tmp = cmd(f'sudo nft -s list chain mangle WANLOADBALANCE_PRE')
self.assertEqual(tmp, mangle_wanloadbalance_pre)
# Check nat chains
tmp = cmd(f'sudo nft -s list chain nat WANLOADBALANCE')
self.assertEqual(tmp, nat_wanloadbalance)
tmp = cmd(f'sudo nft -s list chain nat VYOS_PRE_SNAT_HOOK')
self.assertEqual(tmp, nat_vyos_pre_snat_hook)
# Delete veth interfaces and netns
for iface in [iface1, iface2, iface3, container_iface1, container_iface2, container_iface3]:
call(f'sudo ip link del dev {iface}')
delete_netns(ns1)
delete_netns(ns2)
if __name__ == '__main__':
unittest.main(verbosity=2)
|
