infrastructure/machines/vault01/networking.nix

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{
pkgs,
lib,
meta,
name,
...
}:
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let
inherit (lib) mapAttrs' nameValuePair;
uplink = {
ip = "10.120.33.250";
prefix = 30;
router = "10.120.33.249";
};
mkNetwork =
name:
{
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address ? [ ],
extraNetwork ? { },
...
}:
nameValuePair "10-${name}" ({ inherit name address; } // extraNetwork);
mkNetdev =
name:
{ Id, ... }:
nameValuePair "10-${name}" {
netdevConfig = {
Name = name;
Kind = "vlan";
};
vlanConfig.Id = Id;
};
mkUserVlan =
{
vlan,
netIP,
servIP,
interfaceName,
...
}:
{
name = interfaceName;
value = {
Id = vlan;
extraNetwork = {
networkConfig = {
LinkLocalAddressing = "no";
DHCPServer = "yes";
};
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linkConfig.Promiscuous = true;
addresses = [
{
addressConfig = {
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Address = "${servIP}/27";
AddPrefixRoute = false;
};
}
];
routes = [
{
routeConfig = {
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Destination = "${netIP}/27";
Table = "user";
};
}
];
routingPolicyRules = [
{
routingPolicyRuleConfig = {
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From = "${netIP}/27";
To = "10.0.0.0/27";
IncomingInterface = interfaceName;
Table = "user";
};
}
];
};
};
};
userVlans = builtins.genList (id: rec {
vlan = 4094 - id;
prefix24nb = (id + 1) / 8;
prefix27nb = (id + 1 - prefix24nb * 8) * 32;
netIP = "10.0.${toString prefix24nb}.${toString prefix27nb}";
servIP = "10.0.${toString prefix24nb}.${toString (prefix27nb + 1)}";
interfaceName = "vlan-user-${toString vlan}";
}) 850;
vlans = {
vlan-uplink-cri = {
Id = 223;
address = with uplink; [ "${ip}/${builtins.toString prefix}" ];
extraNetwork.routes = [
{
routeConfig = {
# Get the public ip from the metadata
PreferredSource = builtins.head meta.network.${name}.addresses.ipv4;
Gateway = uplink.router;
};
}
];
};
vlan-admin = {
Id = 3000;
address = [ "fd26:baf9:d250:8000::1/64" ];
};
vlan-admin-ap = {
Id = 3001;
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address = [ "fd26:baf9:d250:8001::1/64" ];
extraNetwork.ipv6Prefixes = [
{
ipv6PrefixConfig = {
AddressAutoconfiguration = false;
OnLink = false;
Prefix = "fd26:baf9:d250:8001::/64";
};
}
];
};
vlan-apro = {
Id = 2000;
address = [ "10.0.255.1/24" ];
extraNetwork.networkConfig.DHCPServer = "yes";
};
} // builtins.listToAttrs (map mkUserVlan userVlans);
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in
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{
systemd = {
network = {
config.routeTables."user" = 1000;
networks = {
"10-lo" = {
name = "lo";
address = [
"::1/128"
"127.0.0.1/8"
"10.0.0.1/27"
];
routes = [
{
routeConfig = {
Destination = "10.0.0.0/27";
Table = "user";
};
}
];
routingPolicyRules = [
{
routingPolicyRuleConfig = {
IncomingInterface = "lo";
Table = "user";
};
}
];
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};
"10-enp67s0f0np0" = {
name = "enp67s0f0np0";
linkConfig.Promiscuous = true;
networkConfig = {
VLAN = builtins.attrNames vlans;
LinkLocalAddressing = false;
LLDP = false;
EmitLLDP = false;
IPv6AcceptRA = false;
IPv6SendRA = false;
};
};
} // (mapAttrs' mkNetwork vlans);
netdevs = mapAttrs' mkNetdev vlans;
};
services = {
ethtoolConfig = {
wantedBy = [ "systemd-networkd.service" ];
after = [ "sys-subsystem-net-devices-enp67s0f0np0.device" ];
bindsTo = [ "sys-subsystem-net-devices-enp67s0f0np0.device" ];
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script = builtins.concatStringsSep "\n" (
builtins.map (name: "${lib.getExe pkgs.ethtool} -K enp67s0f0np0 ${name} off") [
"rxvlan"
"txvlan"
"rx-vlan-filter"
"rx-vlan-offload"
"tx-vlan-offload"
"tx-vlan-stag-hw-insert"
]
);
};
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systemd-networkd.serviceConfig.LimitNOFILE = 4096;
net-checker = {
path = [
pkgs.iputils
pkgs.systemd
];
script = ''
if ping -c 1 8.8.8.8 > /dev/null || ping -c 1 1.1.1.1 > /dev/null; then
${
lib.concatMapStringsSep "\n " ({ interfaceName, ... }: "networkctl up ${interfaceName}") userVlans
}
else
${
lib.concatMapStringsSep "\n " (
{ interfaceName, ... }: "networkctl down ${interfaceName}"
) userVlans
}
fi
'';
};
};
timers.net-checker = {
wantedBy = [ "timers.target" ];
timerConfig.OnCalendar = "*-*-* *:*:42";
};
};
networking = {
nftables = {
enable = true;
tables.nat = {
family = "ip";
content = ''
chain postrouting {
type nat hook postrouting priority 100;
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ip saddr 10.0.0.0/16 snat ip to 129.199.195.130-129.199.195.158
}
'';
};
};
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firewall = {
allowedUDPPorts = [ 67 ];
checkReversePath = false;
};
};
boot.kernel.sysctl."net.ipv4.ip_forward" = true;
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}