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|
{ pkgs, config, lib, ... }:
with lib;
let
trim = str: if hasSuffix "\n" str then trim (removeSuffix "\n" str) else str;
prefix4 = "10.84.47";
prefix6 = "2a03:4000:52:ada:5";
in {
config = {
boot.kernel.sysctl = {
"net.netfilter.nf_log_all_netns" = true;
};
networking.namespaces = {
enable = true;
containers."vpn".config = {
boot.kernel.sysctl = {
"net.core.rmem_max" = "4194304";
"net.core.wmem_max" = "4194304";
};
environment = {
noXlibs = true;
systemPackages = with pkgs; [ wireguard-tools ];
};
networking = {
useDHCP = false;
useNetworkd = true;
useHostResolvConf = false;
firewall.enable = false;
nftables = {
enable = true;
rulesetFile = ./ruleset.nft;
};
};
services.resolved.fallbackDns = [
"9.9.9.10#dns10.quad9.net"
"149.112.112.10#dns10.quad9.net"
"2620:fe::10#dns10.quad9.net"
"2620:fe::fe:10#dns10.quad9.net"
];
systemd.services."systemd-networkd" = {
serviceConfig = {
LoadCredential = [
"surtr.priv"
];
};
};
systemd.network = {
netdevs = {
vpn = {
netdevConfig = {
Name = "vpn";
Kind = "wireguard";
};
wireguardConfig = {
PrivateKeyFile = "/run/credentials/systemd-networkd.service/surtr.priv";
ListenPort = 51820;
};
wireguardPeers = imap1 (i: { name, ip ? i }: {
wireguardPeerConfig = {
AllowedIPs = ["${prefix6}:${toString ip}::/96" "${prefix4}.${toString ip}/32"];
PublicKey = trim (readFile (./. + "/${name}.pub"));
};
}) [ { name = "geri"; } { name = "sif"; } ];
};
};
networks = {
upstream = {
name = "upstream";
matchConfig = {
Name = "upstream";
};
linkConfig = {
RequiredForOnline = true;
};
networkConfig = {
Address = [ "185.243.10.86/32" "2a03:4000:20:259::/64" ];
LLMNR = false;
MulticastDNS = false;
};
routes = [
{ routeConfig = {
Destination = "202.61.240.0/22";
};
}
{ routeConfig = {
Destination = "0.0.0.0/0";
Gateway = "202.61.240.1";
};
}
{ routeConfig = {
Destination = "::/0";
Gateway = "fe80::1";
};
}
];
extraConfig = ''
[Neighbor]
Address=202.61.240.1
LinkLayerAddress=00:00:5e:00:01:01
'';
};
vpn = {
name = "vpn";
matchConfig = {
Name = "vpn";
};
address = ["${prefix6}::/96" "${prefix4}.0/32"];
routes = [
{ routeConfig = {
Destination = "${prefix6}::/80";
};
}
{ routeConfig = {
Destination = "${prefix4}.0/24";
};
}
];
linkConfig = {
RequiredForOnline = false;
};
networkConfig = {
LLMNR = false;
MulticastDNS = false;
};
};
};
};
};
};
systemd.services = {
"vpn-upstream" = {
bindsTo = ["netns@vpn.service"];
after = ["netns@vpn.service"];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
ExecStop = "${pkgs.iproute}/bin/ip netns exec vpn ip link delete upstream";
};
path = with pkgs; [ iproute procps ];
script = ''
ip netns exec vpn sysctl \
net.ipv6.conf.all.forwarding=1 \
net.ipv6.conf.default.forwarding=1 \
net.ipv4.conf.all.forwarding=1 \
net.ipv4.conf.default.forwarding=1
ip link add link ens3 name upstream type ipvlan mode l2
ip link set upstream netns vpn
'';
};
"netns-container@vpn" = {
wantedBy = ["multi-user.target" "network-online.target"];
after = ["vpn-upstream.service"];
bindsTo = ["vpn-upstream.service"];
serviceConfig = {
LoadCredential = [
"surtr.priv:${config.sops.secrets.vpn.path}"
];
};
};
};
sops.secrets.vpn = {
format = "binary";
sopsFile = ./surtr.priv;
};
};
}
|
