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|
{ config, hostName, lib, pkgs, ... }:
with lib;
let
listenPort = {
"4" = 51820;
"6" = 51821;
};
wgSubnet = {
"4" = "2a03:4000:52:ada:2";
"6" = "2a03:4000:52:ada:3";
};
wgSubnetLength = 80;
wgHostLength = wgSubnetLength + 16;
batSubnet = "2a03:4000:52:ada:1";
batSubnetLength = 80;
batHostLength = batSubnetLength + 16;
links = mkLinks [
{ from = "vidhar";
to = "surtr";
endpointHost = "202.61.241.61";
PersistentKeepalive = 25;
family = "4";
}
{ from = "vidhar";
to = "surtr";
endpointHost = "2a03:4000:52:ada::";
PersistentKeepalive = 25;
family = "6";
}
{ from = "sif";
to = "surtr";
endpointHost = "202.61.241.61";
PersistentKeepalive = 25;
family = "4";
}
{ from = "sif";
to = "surtr";
endpointHost = "2a03:4000:52:ada::";
PersistentKeepalive = 25;
family = "6";
}
{ from = "sif";
to = "vidhar";
endpointHost = "10.141.0.1";
PersistentKeepalive = 25;
family = "4";
}
];
wgHostIPs = mapAttrs (_family: wgSubnet: {
surtr = "${wgSubnet}::/${toString wgHostLength}";
vidhar = "${wgSubnet}:1::/${toString wgHostLength}";
sif = "${wgSubnet}:2::/${toString wgHostLength}";
}) wgSubnet;
greHostMACPrefixes = {
"4" = {
surtr = "02:00:01:00:00";
vidhar = "02:00:01:00:01";
sif = "02:00:01:00:02";
};
"6" = {
surtr = "02:00:02:00:00";
vidhar = "02:00:02:00:01";
sif = "02:00:02:00:02";
};
};
batHostMACs = {
surtr = "02:00:00:00:00:00";
vidhar = "02:00:00:01:00:00";
sif = "02:00:00:02:00:00";
};
batHostIPs = {
surtr = ["${batSubnet}::/${toString batHostLength}"];
vidhar = ["${batSubnet}:1::/${toString batHostLength}"];
sif = ["${batSubnet}:2::/${toString batHostLength}"];
};
routers = [ "surtr" ];
mkPublicKeyPath = family: host: ./hosts + "/${family}" + "/${host}.pub";
mkPrivateKeyPath = family: host: ./hosts + "/${family}" + "/${host}.priv";
kernel = config.boot.kernelPackages;
publicKeyPath = family: mkPublicKeyPath family hostName;
privateKeyPath = family: mkPrivateKeyPath family hostName;
inNetwork' = family: pathExists (privateKeyPath family) && pathExists (publicKeyPath family);
inNetwork = any inNetwork' families;
hostLinks = filterAttrs (_family: links: links != []) (mapAttrs (_family: filter ({ from, to, ... }: thisHost from || thisHost to)) links);
linkToPeer = family: opts@{from, to, ...}:
let
other = if thisHost from then to else from;
in {
AllowedIPs = if elem other routers then ["0.0.0.0/0" "::/0"] else wgHostIPs.${family}.${other};
PublicKey = trim (readFile (mkPublicKeyPath family other));
} // (optionalAttrs (thisHost from) (linkCfgFilterCustom opts // linkMkEndpointCfg family opts));
linkCfgFilterCustom = filterAttrs (n: _v: !(elem n ["from" "to" "endpointHost"]));
linkMkEndpointCfg = family: opts@{from, ...}: optionalAttrs (opts ? "endpointHost" && thisHost from) { Endpoint = "${opts.endpointHost}:${toString listenPort.${family}}"; };
linkToGreDev = family: opts@{from, to, ...}:
let
other = if thisHost from then to else from;
in nameValuePair "yggre-${other}-${family}" {
netdevConfig = {
Name = "yggre-${other}-${family}";
Kind = "ip6gretap";
};
tunnelConfig = {
Local = stripSubnet wgHostIPs.${family}.${hostName};
Remote = stripSubnet wgHostIPs.${family}.${other};
};
};
linkToGreNetwork = family: ix: opts@{from, to, ...}:
let
other = if thisHost from then to else from;
in nameValuePair "yggre-${other}-${family}" {
matchConfig = {
Name = "yggre-${other}-${family}";
};
linkConfig = {
MACAddress = "${greHostMACPrefixes.${family}.${hostName}}:${toHexByte ix}";
RequiredForOnline = false;
};
networkConfig = {
BatmanAdvanced = "yggdrasil";
LinkLocalAddressing = "no";
};
};
familyToYggdrasilDev = family: nameValuePair "yggdrasil-wg-${family}" {
netdevConfig = {
Name = "yggdrasil-wg-${family}";
Kind = "wireguard";
};
wireguardConfig = {
PrivateKeyFile = config.sops.secrets."yggdrasil-wg-${family}.priv".path;
ListenPort = listenPort.${family};
};
wireguardPeers = map (opts@{to, from, ...}: { wireguardPeerConfig = linkToPeer family opts; }) hostLinks.${family};
};
familyToYggdrasilNetwork = family: nameValuePair "yggdrasil-wg-${family}" {
name = "yggdrasil-wg-${family}";
matchConfig = {
Name = "yggdrasil-wg-${family}";
};
address = [wgHostIPs.${family}.${hostName}];
routes = [
{ routeConfig = {
Destination = "${wgSubnet.${family}}::/${toString wgSubnetLength}";
};
}
];
linkConfig = {
RequiredForOnline = false;
};
networkConfig = {
Tunnel = map (opts@{from, to, ...}: let other = if thisHost from then to else from; in "yggre-${other}-${family}") hostLinks.${family};
};
};
familyToSopsSecret = family: nameValuePair "yggdrasil-wg-${family}.priv" (mkIf (pathExists (privateKeyPath family)) {
format = "binary";
sopsFile = privateKeyPath family;
mode = "0640";
owner = "root";
group = "systemd-network";
});
thisHost = host: host == hostName;
trim = str: if hasSuffix "\n" str then trim (removeSuffix "\n" str) else str;
stripSubnet = addr: let matchRes = builtins.match "^(.*)/[0-9]+$" addr; in if matchRes == null then addr else elemAt matchRes 0;
optIx = optName: xs: let
withOpts = listToAttrs (imap0 (ix: x: nameValuePair x.name (x.value // { ${optName} = ix; })) (filter (x: x.value.${optName} or false) (imap0 (ix: nameValuePair (toString ix)) xs)));
withoutOpts = listToAttrs (map (nv: nameValuePair nv.name (removeAttrs nv.value [optName])) (filter (x: !(x.value.${optName} or false)) (imap0 (ix: nameValuePair (toString ix)) xs)));
in genList (ix: withOpts.${toString ix} or withoutOpts.${toString ix}) (length xs);
groupFamilies = links: mapAttrs (_name: value: map (filterAttrs (k: _v: k != "family")) value) (groupBy (x: x.family) links);
mkLinks = groupFamilies;
families = attrNames links;
hostFamilies = attrNames hostLinks;
toHexByte = n: let
hex = toHexString n;
in if (stringLength hex < 2) then "0${hex}" else hex;
in {
config = {
systemd.network = mkIf inNetwork {
enable = true;
netdevs = {
yggdrasil = {
netdevConfig = {
Name = "yggdrasil";
Kind = "batadv";
};
};
} // listToAttrs (map familyToYggdrasilDev hostFamilies) // listToAttrs (concatMap (family: map (linkToGreDev family) hostLinks.${family}) hostFamilies);
networks = {
yggdrasil = {
name = "yggdrasil";
matchConfig = {
Name = "yggdrasil";
};
address = batHostIPs.${hostName};
routes = [
{ routeConfig = {
Destination = "${batSubnet}::/${toString batSubnetLength}";
};
}
] ++ (concatMap (router: map (rAddr: { routeConfig = { Destination = "::/0"; Gateway = stripSubnet rAddr; Table = "yggdrasil"; }; }) batHostIPs.${router}) routers);
routingPolicyRules = map (addr: { routingPolicyRuleConfig = { Table = "yggdrasil"; From = stripSubnet addr; Priority = 1; }; }) batHostIPs.${hostName};
linkConfig = {
MACAddress = "${batHostMACs.${hostName}}";
RequiredForOnline = false;
};
};
} // listToAttrs (map familyToYggdrasilNetwork hostFamilies) // listToAttrs (concatMap (family: imap0 (linkToGreNetwork family) hostLinks.${family}) hostFamilies);
};
environment.etc."systemd/networkd.conf" = mkIf inNetwork {
text = ''
[Network]
RouteTable=yggdrasil:1024
'';
};
sops.secrets = listToAttrs (map familyToSopsSecret hostFamilies);
networking.hosts = mkIf inNetwork (listToAttrs (concatMap ({name, value}: map (ip: nameValuePair (stripSubnet ip) ["${name}.yggdrasil"]) value) (mapAttrsToList nameValuePair batHostIPs)));
boot.extraModulePackages = optional (versionOlder kernel.kernel.version "5.6") kernel.wireguard ++ [kernel.batman_adv];
environment.systemPackages = with pkgs; [ wireguard-tools batctl ];
services.udev.extraRules = mkIf config.networking.networkmanager.enable (lib.mkAfter (concatMapStringsSep "\n" (dev: "ACTION==\"add\", SUBSYSTEM==\"net\", KERNEL==\"${dev}\", ENV{NM_UNMANAGED}=\"1\"") (["yggdrasil"] ++ map (family: "yggdrasil-wg-${family}") hostFamilies ++ concatMap (family: map ({from, to, ...}: let other = if thisHost from then to else from; in "yggre-${other}-${family}") hostLinks.${family}) hostFamilies)));
};
}
|
