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#!/usr/bin/env python3
#
# Copyright (C) 2022-2024 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.utils.file import chmod_755
from vyos.utils.file import write_file
from vyos.utils.process import call
from vyos.utils.process 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()
removed_chains = [
'wlb_mangle_isp_veth1',
'wlb_mangle_isp_veth2',
'wlb_mangle_isp_eth201',
'wlb_mangle_isp_eth202'
]
for chain in removed_chains:
self.verify_nftables_chain_exists('ip vyos_wanloadbalance', chain, inverse=True)
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', 'hook', '/bin/true'])
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 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]:
call(f'sudo ip link del dev {iface}')
delete_netns(ns1)
delete_netns(ns2)
delete_netns(ns3)
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 vyos_wanloadbalance {
chain wlb_mangle_isp_veth1 {
meta mark set 0x000000c9 ct mark set 0x000000c9 counter accept
}
}"""
mangle_isp2 = """table ip vyos_wanloadbalance {
chain wlb_mangle_isp_veth2 {
meta mark set 0x000000ca ct mark set 0x000000ca counter accept
}
}"""
mangle_prerouting = """table ip vyos_wanloadbalance {
chain wlb_mangle_prerouting {
type filter hook prerouting priority mangle; policy accept;
iifname "veth3" ip saddr 198.51.100.0/24 ct state new limit rate 5/second burst 5 packets counter numgen random mod 11 vmap { 0 : jump wlb_mangle_isp_veth1, 1-10 : jump wlb_mangle_isp_veth2 }
iifname "veth3" ip saddr 198.51.100.0/24 counter meta mark set ct mark
}
}"""
nat_wanloadbalance = """table ip vyos_wanloadbalance {
chain wlb_nat_postrouting {
type nat hook postrouting priority srcnat - 1; policy accept;
ct mark 0x000000c9 counter snat to 203.0.113.10
ct mark 0x000000ca counter snat to 192.0.2.10
}
}"""
# 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, 'weight', '10'])
# commit changes
self.cli_commit()
time.sleep(5)
# Check mangle chains
tmp = cmd(f'sudo nft -s list chain ip vyos_wanloadbalance wlb_mangle_isp_{iface1}')
self.assertEqual(tmp, mangle_isp1)
tmp = cmd(f'sudo nft -s list chain ip vyos_wanloadbalance wlb_mangle_isp_{iface2}')
self.assertEqual(tmp, mangle_isp2)
tmp = cmd('sudo nft -s list chain ip vyos_wanloadbalance wlb_mangle_prerouting')
self.assertEqual(tmp, mangle_prerouting)
# Check nat chains
tmp = cmd('sudo nft -s list chain ip vyos_wanloadbalance wlb_nat_postrouting')
self.assertEqual(tmp, nat_wanloadbalance)
# Delete veth interfaces and netns
for iface in [iface1, iface2, iface3]:
call(f'sudo ip link del dev {iface}')
delete_netns(ns1)
delete_netns(ns2)
delete_netns(ns3)
def test_criteria_failover_hook(self):
isp1_iface = 'eth0'
isp2_iface = 'eth1'
lan_iface = 'eth2'
hook_path = '/tmp/wlb_hook.sh'
hook_output_path = '/tmp/wlb_hook_output'
hook_script = f"""
#!/bin/sh
ifname=$WLB_INTERFACE_NAME
state=$WLB_INTERFACE_STATE
echo "$ifname - $state" > {hook_output_path}
"""
write_file(hook_path, hook_script)
chmod_755(hook_path)
self.cli_set(['interfaces', 'ethernet', isp1_iface, 'address', '203.0.113.2/30'])
self.cli_set(['interfaces', 'ethernet', isp2_iface, 'address', '192.0.2.2/30'])
self.cli_set(['interfaces', 'ethernet', lan_iface, 'address', '198.51.100.2/30'])
self.cli_set(base_path + ['wan', 'hook', hook_path])
self.cli_set(base_path + ['wan', 'interface-health', isp1_iface, 'failure-count', '1'])
self.cli_set(base_path + ['wan', 'interface-health', isp1_iface, 'nexthop', '203.0.113.2'])
self.cli_set(base_path + ['wan', 'interface-health', isp1_iface, 'success-count', '1'])
self.cli_set(base_path + ['wan', 'interface-health', isp2_iface, 'failure-count', '1'])
self.cli_set(base_path + ['wan', 'interface-health', isp2_iface, 'nexthop', '192.0.2.2'])
self.cli_set(base_path + ['wan', 'interface-health', isp2_iface, 'success-count', '1'])
self.cli_set(base_path + ['wan', 'rule', '10', 'failover'])
self.cli_set(base_path + ['wan', 'rule', '10', 'inbound-interface', lan_iface])
self.cli_set(base_path + ['wan', 'rule', '10', 'protocol', 'udp'])
self.cli_set(base_path + ['wan', 'rule', '10', 'source', 'address', '198.51.100.0/24'])
self.cli_set(base_path + ['wan', 'rule', '10', 'source', 'port', '53'])
self.cli_set(base_path + ['wan', 'rule', '10', 'destination', 'address', '192.0.2.0/24'])
self.cli_set(base_path + ['wan', 'rule', '10', 'destination', 'port', '53'])
self.cli_set(base_path + ['wan', 'rule', '10', 'interface', isp1_iface])
self.cli_set(base_path + ['wan', 'rule', '10', 'interface', isp1_iface, 'weight', '10'])
self.cli_set(base_path + ['wan', 'rule', '10', 'interface', isp2_iface])
# commit changes
self.cli_commit()
time.sleep(5)
# Verify isp1 + criteria
nftables_search = [
[f'iifname "{lan_iface}"', 'ip saddr 198.51.100.0/24', 'udp sport 53', 'ip daddr 192.0.2.0/24', 'udp dport 53', f'jump wlb_mangle_isp_{isp1_iface}']
]
self.verify_nftables_chain(nftables_search, 'ip vyos_wanloadbalance', 'wlb_mangle_prerouting')
# Trigger failure on isp1 health check
self.cli_delete(['interfaces', 'ethernet', isp1_iface, 'address', '203.0.113.2/30'])
self.cli_commit()
time.sleep(10)
# Verify failover to isp2
nftables_search = [
[f'iifname "{lan_iface}"', f'jump wlb_mangle_isp_{isp2_iface}']
]
self.verify_nftables_chain(nftables_search, 'ip vyos_wanloadbalance', 'wlb_mangle_prerouting')
# Verify hook output
self.assertTrue(os.path.exists(hook_output_path))
with open(hook_output_path, 'r') as f:
self.assertIn('eth0 - FAILED', f.read())
if __name__ == '__main__':
unittest.main(verbosity=2)
|
