238 lines
7.0 KiB
Nix
238 lines
7.0 KiB
Nix
# This test verifies that we can ping an IPv4-only server from an IPv6-only
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# client via a NAT64 router. The hosts and networks are configured as follows:
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#
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# +------
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# Client | eth1 Address: 2001:db8::2/64
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# | | Route: 64:ff9b::/96 via 2001:db8::1
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# +--|---
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# | VLAN 3
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# +--|---
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# | eth2 Address: 2001:db8::1/64
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# Router |
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# | nat64 Address: 64:ff9b::1/128
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# | Route: 64:ff9b::/96
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# | Address: 192.0.2.0/32
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# | Route: 192.0.2.0/24
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# |
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# | eth1 Address: 100.64.0.1/24
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# +--|---
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# | VLAN 2
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# +--|---
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# Server | eth1 Address: 100.64.0.2/24
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# | Route: 192.0.2.0/24 via 100.64.0.1
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# +------
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import ./make-test-python.nix ({ pkgs, lib, ... }:
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{
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name = "tayga";
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meta = with pkgs.lib.maintainers; {
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maintainers = [ hax404 ];
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};
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nodes = {
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# The server is configured with static IPv4 addresses. RFC 6052 Section 3.1
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# disallows the mapping of non-global IPv4 addresses like RFC 1918 into the
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# Well-Known Prefix 64:ff9b::/96. TAYGA also does not allow the mapping of
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# documentation space (RFC 5737). To circumvent this, 100.64.0.2/24 from
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# RFC 6589 (Carrier Grade NAT) is used here.
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# To reach the IPv4 address pool of the NAT64 gateway, there is a static
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# route configured. In normal cases, where the router would also source NAT
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# the pool addresses to one IPv4 addresses, this would not be needed.
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server = {
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virtualisation.vlans = [
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2 # towards router
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];
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networking = {
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useDHCP = false;
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interfaces.eth1 = lib.mkForce {};
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};
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systemd.network = {
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enable = true;
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networks."vlan1" = {
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matchConfig.Name = "eth1";
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address = [
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"100.64.0.2/24"
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];
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routes = [
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{ routeConfig = { Destination = "192.0.2.0/24"; Gateway = "100.64.0.1"; }; }
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];
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};
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};
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};
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# The router is configured with static IPv4 addresses towards the server
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# and IPv6 addresses towards the client. For NAT64, the Well-Known prefix
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# 64:ff9b::/96 is used. NAT64 is done with TAYGA which provides the
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# tun-interface nat64 and does the translation over it. The IPv6 packets
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# are sent to this interfaces and received as IPv4 packets and vice versa.
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# As TAYGA only translates IPv6 addresses to dedicated IPv4 addresses, it
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# needs a pool of IPv4 addresses which must be at least as big as the
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# expected amount of clients. In this test, the packets from the pool are
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# directly routed towards the client. In normal cases, there would be a
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# second source NAT44 to map all clients behind one IPv4 address.
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router_systemd = {
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boot.kernel.sysctl = {
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"net.ipv4.ip_forward" = 1;
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"net.ipv6.conf.all.forwarding" = 1;
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};
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virtualisation.vlans = [
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2 # towards server
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3 # towards client
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];
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networking = {
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useDHCP = false;
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useNetworkd = true;
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firewall.enable = false;
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interfaces.eth1 = lib.mkForce {
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ipv4 = {
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addresses = [ { address = "100.64.0.1"; prefixLength = 24; } ];
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};
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};
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interfaces.eth2 = lib.mkForce {
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ipv6 = {
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addresses = [ { address = "2001:db8::1"; prefixLength = 64; } ];
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};
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};
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};
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services.tayga = {
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enable = true;
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ipv4 = {
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address = "192.0.2.0";
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router = {
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address = "192.0.2.1";
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};
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pool = {
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address = "192.0.2.0";
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prefixLength = 24;
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};
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};
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ipv6 = {
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address = "2001:db8::1";
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router = {
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address = "64:ff9b::1";
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};
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pool = {
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address = "64:ff9b::";
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prefixLength = 96;
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};
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};
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};
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};
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router_nixos = {
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boot.kernel.sysctl = {
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"net.ipv4.ip_forward" = 1;
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"net.ipv6.conf.all.forwarding" = 1;
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};
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virtualisation.vlans = [
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2 # towards server
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3 # towards client
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];
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networking = {
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useDHCP = false;
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firewall.enable = false;
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interfaces.eth1 = lib.mkForce {
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ipv4 = {
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addresses = [ { address = "100.64.0.1"; prefixLength = 24; } ];
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};
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};
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interfaces.eth2 = lib.mkForce {
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ipv6 = {
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addresses = [ { address = "2001:db8::1"; prefixLength = 64; } ];
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};
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};
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};
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services.tayga = {
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enable = true;
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ipv4 = {
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address = "192.0.2.0";
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router = {
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address = "192.0.2.1";
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};
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pool = {
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address = "192.0.2.0";
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prefixLength = 24;
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};
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};
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ipv6 = {
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address = "2001:db8::1";
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router = {
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address = "64:ff9b::1";
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};
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pool = {
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address = "64:ff9b::";
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prefixLength = 96;
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};
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};
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};
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};
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# The client is configured with static IPv6 addresses. It has also a static
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# route for the NAT64 IP space where the IPv4 addresses are mapped in. In
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# normal cases, there would be only a default route.
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client = {
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virtualisation.vlans = [
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3 # towards router
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];
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networking = {
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useDHCP = false;
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interfaces.eth1 = lib.mkForce {};
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};
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systemd.network = {
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enable = true;
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networks."vlan1" = {
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matchConfig.Name = "eth1";
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address = [
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"2001:db8::2/64"
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];
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routes = [
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{ routeConfig = { Destination = "64:ff9b::/96"; Gateway = "2001:db8::1"; }; }
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];
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};
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};
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environment.systemPackages = [ pkgs.mtr ];
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};
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};
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testScript = ''
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# start client and server
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for machine in client, server:
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machine.systemctl("start network-online.target")
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machine.wait_for_unit("network-online.target")
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machine.log(machine.execute("ip addr")[1])
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machine.log(machine.execute("ip route")[1])
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machine.log(machine.execute("ip -6 route")[1])
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# test systemd-networkd and nixos-scripts based router
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for router in router_systemd, router_nixos:
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router.start()
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router.systemctl("start network-online.target")
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router.wait_for_unit("network-online.target")
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router.wait_for_unit("tayga.service")
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router.log(machine.execute("ip addr")[1])
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router.log(machine.execute("ip route")[1])
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router.log(machine.execute("ip -6 route")[1])
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with subtest("Wait for tayga"):
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router.wait_for_unit("tayga.service")
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with subtest("Test ICMP"):
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client.wait_until_succeeds("ping -c 3 64:ff9b::100.64.0.2 >&2")
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with subtest("Test ICMP and show a traceroute"):
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client.wait_until_succeeds("mtr --show-ips --report-wide 64:ff9b::100.64.0.2 >&2")
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router.log(router.execute("systemd-analyze security tayga.service")[1])
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router.shutdown()
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'';
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})
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