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nixos/networkd: add test for VRF configurations

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Maximilian Bosch 2020-01-25 16:46:55 +01:00
parent bc130855a7
commit a0fd819a4a
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1
nixos/tests/all-tests.nix
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@ -275,6 +275,7 @@ in
systemd-analyze = handleTest ./systemd-analyze.nix {};
systemd-confinement = handleTest ./systemd-confinement.nix {};
systemd-timesyncd = handleTest ./systemd-timesyncd.nix {};
systemd-networkd-vrf = handleTest ./systemd-networkd-vrf.nix {};
systemd-networkd-wireguard = handleTest ./systemd-networkd-wireguard.nix {};
systemd-nspawn = handleTest ./systemd-nspawn.nix {};
pdns-recursor = handleTest ./pdns-recursor.nix {};

221
nixos/tests/systemd-networkd-vrf.nix Normal file
View file

@ -0,0 +1,221 @@
import ./make-test-python.nix ({ pkgs, lib, ... }: let
inherit (import ./ssh-keys.nix pkgs) snakeOilPrivateKey snakeOilPublicKey;
in {
name = "systemd-networkd-vrf";
meta.maintainers = with lib.maintainers; [ ma27 ];
nodes = {
client = { pkgs, ... }: {
virtualisation.vlans = [ 1 2 ];
networking = {
useDHCP = false;
useNetworkd = true;
firewall.checkReversePath = "loose";
};
systemd.network = {
enable = true;
netdevs."10-vrf1" = {
netdevConfig = {
Kind = "vrf";
Name = "vrf1";
MTUBytes = "1300";
};
vrfConfig.Table = 23;
};
netdevs."10-vrf2" = {
netdevConfig = {
Kind = "vrf";
Name = "vrf2";
MTUBytes = "1300";
};
vrfConfig.Table = 42;
};
networks."10-vrf1" = {
matchConfig.Name = "vrf1";
networkConfig.IPForward = "yes";
routes = [
{ routeConfig = { Destination = "192.168.1.2"; Metric = "100"; }; }
];
};
networks."10-vrf2" = {
matchConfig.Name = "vrf2";
networkConfig.IPForward = "yes";
routes = [
{ routeConfig = { Destination = "192.168.2.3"; Metric = "100"; }; }
];
};
networks."10-eth1" = {
matchConfig.Name = "eth1";
linkConfig.RequiredForOnline = "no";
networkConfig = {
VRF = "vrf1";
Address = "192.168.1.1";
IPForward = "yes";
};
};
networks."10-eth2" = {
matchConfig.Name = "eth2";
linkConfig.RequiredForOnline = "no";
networkConfig = {
VRF = "vrf2";
Address = "192.168.2.1";
IPForward = "yes";
};
};
};
};
node1 = { pkgs, ... }: {
virtualisation.vlans = [ 1 ];
networking = {
useDHCP = false;
useNetworkd = true;
};
services.openssh.enable = true;
users.users.root.openssh.authorizedKeys.keys = [ snakeOilPublicKey ];
systemd.network = {
enable = true;
networks."10-eth1" = {
matchConfig.Name = "eth1";
linkConfig.RequiredForOnline = "no";
networkConfig = {
Address = "192.168.1.2";
IPForward = "yes";
};
};
};
};
node2 = { pkgs, ... }: {
virtualisation.vlans = [ 2 ];
networking = {
useDHCP = false;
useNetworkd = true;
};
systemd.network = {
enable = true;
networks."10-eth2" = {
matchConfig.Name = "eth2";
linkConfig.RequiredForOnline = "no";
networkConfig = {
Address = "192.168.2.3";
IPForward = "yes";
};
};
};
};
node3 = { pkgs, ... }: {
virtualisation.vlans = [ 2 ];
networking = {
useDHCP = false;
useNetworkd = true;
};
systemd.network = {
enable = true;
networks."10-eth2" = {
matchConfig.Name = "eth2";
linkConfig.RequiredForOnline = "no";
networkConfig = {
Address = "192.168.2.4";
IPForward = "yes";
};
};
};
};
};
testScript = ''
def compare_tables(expected, actual):
assert (
expected == actual
), """
Routing tables don't match!
Expected:
{}
Actual:
{}
""".format(
expected, actual
)
start_all()
client.wait_for_unit("network.target")
node1.wait_for_unit("network.target")
node2.wait_for_unit("network.target")
node3.wait_for_unit("network.target")
client_ipv4_table = """
192.168.1.2 dev vrf1 proto static metric 100
192.168.2.3 dev vrf2 proto static metric 100
""".strip()
vrf1_table = """
broadcast 192.168.1.0 dev eth1 proto kernel scope link src 192.168.1.1
192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.1
local 192.168.1.1 dev eth1 proto kernel scope host src 192.168.1.1
broadcast 192.168.1.255 dev eth1 proto kernel scope link src 192.168.1.1
""".strip()
vrf2_table = """
broadcast 192.168.2.0 dev eth2 proto kernel scope link src 192.168.2.1
192.168.2.0/24 dev eth2 proto kernel scope link src 192.168.2.1
local 192.168.2.1 dev eth2 proto kernel scope host src 192.168.2.1
broadcast 192.168.2.255 dev eth2 proto kernel scope link src 192.168.2.1
""".strip()
# Check that networkd properly configures the main routing table
# and the routing tables for the VRF.
with subtest("check vrf routing tables"):
compare_tables(
client_ipv4_table, client.succeed("ip -4 route list | head -n2").strip()
)
compare_tables(
vrf1_table, client.succeed("ip -4 route list table 23 | head -n4").strip()
)
compare_tables(
vrf2_table, client.succeed("ip -4 route list table 42 | head -n4").strip()
)
# Ensure that other nodes are reachable via ICMP through the VRF.
with subtest("icmp through vrf works"):
client.succeed("ping -c5 192.168.1.2")
client.succeed("ping -c5 192.168.2.3")
# Test whether SSH through a VRF IP is possible.
# (Note: this seems to be an issue on Linux 5.x, so I decided to add this to
# ensure that we catch this when updating the default kernel).
with subtest("tcp traffic through vrf works"):
node1.wait_for_open_port(22)
client.succeed(
"cat ${snakeOilPrivateKey} > privkey.snakeoil"
)
client.succeed("chmod 600 privkey.snakeoil")
client.succeed(
"ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i privkey.snakeoil root@192.168.1.2 true"
)
# Only configured routes through the VRF from the main routing table should
# work. Additional IPs are only reachable when binding to the vrf interface.
with subtest("only routes from main routing table work by default"):
client.fail("ping -c5 192.168.2.4")
client.succeed("ping -I vrf2 -c5 192.168.2.4")
client.shutdown()
node1.shutdown()
node2.shutdown()
node3.shutdown()
'';
})