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|
# This test verifies that we can ping an IPv4-only server from an IPv6-only
# client via a NAT64 router using CLAT on the client. The hosts and networks
# are configured as follows:
#
# +------
# Client | clat Address: 192.0.0.1/32 (configured via clatd)
# | Route: default
# |
# | eth1 Address: 2001:db8::2/64
# | | Route: default via 2001:db8::1
# +--|---
# | VLAN 3
# +--|---
# | eth2 Address: 2001:db8::1/64
# Router |
# | nat64 Address: 64:ff9b::1/128
# | Route: 64:ff9b::/96
# | Address: 192.0.2.0/32
# | Route: 192.0.2.0/24
# |
# | eth1 Address: 100.64.0.1/24
# +--|---
# | VLAN 2
# +--|---
# Server | eth1 Address: 100.64.0.2/24
# | Route: 192.0.2.0/24 via 100.64.0.1
# +------
import ./make-test-python.nix ({ pkgs, lib, ... }:
{
name = "clatd";
meta = with pkgs.lib.maintainers; {
maintainers = [ hax404 ];
};
nodes = {
# The server is configured with static IPv4 addresses. RFC 6052 Section 3.1
# disallows the mapping of non-global IPv4 addresses like RFC 1918 into the
# Well-Known Prefix 64:ff9b::/96. TAYGA also does not allow the mapping of
# documentation space (RFC 5737). To circumvent this, 100.64.0.2/24 from
# RFC 6589 (Carrier Grade NAT) is used here.
# To reach the IPv4 address pool of the NAT64 gateway, there is a static
# route configured. In normal cases, where the router would also source NAT
# the pool addresses to one IPv4 addresses, this would not be needed.
server = {
virtualisation.vlans = [
2 # towards router
];
networking = {
useDHCP = false;
interfaces.eth1 = lib.mkForce {};
};
systemd.network = {
enable = true;
networks."vlan1" = {
matchConfig.Name = "eth1";
address = [
"100.64.0.2/24"
];
routes = [
{ routeConfig = { Destination = "192.0.2.0/24"; Gateway = "100.64.0.1"; }; }
];
};
};
};
# The router is configured with static IPv4 addresses towards the server
# and IPv6 addresses towards the client. For NAT64, the Well-Known prefix
# 64:ff9b::/96 is used. NAT64 is done with TAYGA which provides the
# tun-interface nat64 and does the translation over it. The IPv6 packets
# are sent to this interfaces and received as IPv4 packets and vice versa.
# As TAYGA only translates IPv6 addresses to dedicated IPv4 addresses, it
# needs a pool of IPv4 addresses which must be at least as big as the
# expected amount of clients. In this test, the packets from the pool are
# directly routed towards the client. In normal cases, there would be a
# second source NAT44 to map all clients behind one IPv4 address.
router = {
boot.kernel.sysctl = {
"net.ipv4.ip_forward" = 1;
"net.ipv6.conf.all.forwarding" = 1;
};
virtualisation.vlans = [
2 # towards server
3 # towards client
];
networking = {
useDHCP = false;
useNetworkd = true;
firewall.enable = false;
interfaces.eth1 = lib.mkForce {
ipv4 = {
addresses = [ { address = "100.64.0.1"; prefixLength = 24; } ];
};
};
interfaces.eth2 = lib.mkForce {
ipv6 = {
addresses = [ { address = "2001:db8::1"; prefixLength = 64; } ];
};
};
};
services.tayga = {
enable = true;
ipv4 = {
address = "192.0.2.0";
router = {
address = "192.0.2.1";
};
pool = {
address = "192.0.2.0";
prefixLength = 24;
};
};
ipv6 = {
address = "2001:db8::1";
router = {
address = "64:ff9b::1";
};
pool = {
address = "64:ff9b::";
prefixLength = 96;
};
};
};
};
# The client is configured with static IPv6 addresses. It has also a static
# default route towards the router. To reach the IPv4-only server, the
# client starts the clat daemon which starts and configures the local
# IPv4 -> IPv6 translation via Tayga.
client = {
virtualisation.vlans = [
3 # towards router
];
networking = {
useDHCP = false;
interfaces.eth1 = lib.mkForce {};
};
systemd.network = {
enable = true;
networks."vlan1" = {
matchConfig.Name = "eth1";
address = [
"2001:db8::2/64"
];
routes = [
{ routeConfig = { Destination = "::/0"; Gateway = "2001:db8::1"; }; }
];
};
};
services.clatd = {
enable = true;
settings.plat-prefix = "64:ff9b::/96";
};
environment.systemPackages = [ pkgs.mtr ];
};
};
testScript = ''
start_all()
# wait for all machines to start up
for machine in client, router, server:
machine.wait_for_unit("network-online.target")
with subtest("Wait for tayga and clatd"):
router.wait_for_unit("tayga.service")
client.wait_for_unit("clatd.service")
# clatd checks if this system has IPv4 connectivity for 10 seconds
client.wait_until_succeeds(
'journalctl -u clatd -e | grep -q "Starting up TAYGA, using config file"'
)
with subtest("Test ICMP"):
client.wait_until_succeeds("ping -c 3 100.64.0.2 >&2")
with subtest("Test ICMP and show a traceroute"):
client.wait_until_succeeds("mtr --show-ips --report-wide 100.64.0.2 >&2")
client.log(client.execute("systemd-analyze security clatd.service")[1])
'';
})
|
