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simplified mesh

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asyncnomi 2025-07-22 20:50:48 +02:00
parent 6aee4ab033
commit 71be15629e
14 changed files with 45 additions and 64 deletions
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85
shared/commons/mesh.nix
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@ -19,71 +19,52 @@ let
};
generatedSecrets = lib.mapAttrsToList (name: node: buildSecret node.zone node.id) nodes;
shorten = peerName: let
parts = lib.splitString "-" peerName;
shortened = lib.concatStrings (map (part: lib.substring 0 1 part) parts);
in shortened;
# Filter itself out of the peer list
peerConfigs = lib.filterAttrs (_peerName: peerConfig: peerConfig.id != myId) nodes;
# We'll make one if per peer, this is more flexible
interfacePeers = lib.flatten (lib.mapAttrsToList (peerName: peerConfig: let
remoteId = peerConfig.id;
remoteZone = peerConfig.zone;
# The mesh is for now only IPv4 based
if4 = {
"mesh-${shorten peerName}-${toString remoteZone}-${toString remoteId}" = {
generateWireGuardInterface = nodesConfig: let
myPeer = nodesConfig."${config.hostName}";
myZone = myPeer.zone;
myId = myPeer.id;
# Filter itself out of the peer list
peerConfigs = lib.filterAttrs (_peerName: peerConfig: (peerConfig.zone != myZone) || (peerConfig.id != myId)) nodesConfig;
peers = lib.mapAttrsToList (peerName: peerConfig: {
name = "${peerName}";
publicKey = peerConfig.wg-pub;
allowedIPs = [
"172.19.${toString peerConfig.zone}.${toString peerConfig.id}/32"
"fc00::${toString peerConfig.zone}:${toString peerConfig.id}/128"
] ++ lib.optionals (lib.elem peerName mapping.bastion) [
"172.19.${toString (peerConfig.zone + 127)}.0/24"
"fc00:f::${toString (peerConfig.zone + 127)}:0/112"
];
endpoint = "${builtins.head (builtins.split "/" peerConfig.ip4)}:51820";
persistentKeepalive = 25;
}) peerConfigs;
interface = {
"mesh" = {
ips = [
"172.19.0.${toString myId}/32"
"172.19.${toString myId}.${toString remoteId}/32"
"fc00::${toString myId}/128"
"fc00::${toString myId}:${toString remoteId}/128"
"172.19.${toString myZone}.${toString myId}/16"
"fc00::${toString myZone}:${toString myId}/96"
];
privateKeyFile = config.age.secrets."wg-private-zone-${toString myZone}-id-${toString myId}".path;
listenPort = 51000 + remoteId;
peers = [{
name = "${peerName}-ip4";
publicKey = peerConfig.wg-pub;
allowedIPs = [
# Allow mesh trafic
"172.19.0.${toString peerConfig.id}/32"
"172.19.${toString peerConfig.id}.0/24"
"fc00::${toString peerConfig.id}:0/96"
# Allow mgmt transport
"172.19.128.0/17"
"fc00:f::/96"
];
endpoint = "${builtins.head (builtins.split "/" peerConfig.ip4)}:${toString (51000 + myId)}";
persistentKeepalive = 25;
}];
# Throw away route created by wireguard
table = "off";
listenPort = 51820;
peers = peers;
};
};
in interface;
in if4) peerConfigs);
wireguardInterfaces = builtins.foldl' (acc: set: acc // set) {} interfacePeers;
wireguardInterfaces = generateWireGuardInterface nodes;
generateRoute = peerName: peerConfig: ''
# Static route to declare static wireguard peer inner tunnel ip (that has been thrown away to the "off" table)
${pkgs.iproute2}/bin/ip route replace 172.19.${toString peerConfig.id}.0/24 dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id} scope link
${pkgs.iproute2}/bin/ip -6 route replace fc00::${toString peerConfig.id}:0/112 dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id} scope link
# Nodes self ip
${pkgs.iproute2}/bin/ip route replace 172.19.0.${toString peerConfig.id}/32 dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id} scope link
${pkgs.iproute2}/bin/ip -6 route replace fc00::${toString peerConfig.id}/128 dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id} scope link
# Return path for mgmt trafic
${if lib.elem peerName mapping.bastion then ''
${pkgs.iproute2}/bin/ip route replace 172.19.${toString (peerConfig.zone + 127)}.0/24 via 172.19.${toString peerConfig.id}.${toString myId} dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id}
${pkgs.iproute2}/bin/ip -6 route replace fc00:f::${toString (peerConfig.zone + 127)}:0/112 via fc00::${toString peerConfig.id}:${toString myId} dev mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id}
${pkgs.iproute2}/bin/ip route replace 172.19.${toString (peerConfig.zone + 127)}.0/24 via 172.19.${toString peerConfig.id}.${toString myId} dev mesh
${pkgs.iproute2}/bin/ip -6 route replace fc00:f::${toString (peerConfig.zone + 127)}:0/112 via fc00::${toString peerConfig.id}:${toString myId} dev mesh
'' else ""}
'';
generateAfter = peerName: peerConfig: "wireguard-mesh-${shorten peerName}-${toString peerConfig.zone}-${toString peerConfig.id}.target";
generateAfter = peerName: peerConfig: "wireguard-mesh.target";
routes = lib.mapAttrsToList (name: peer: generateRoute name peer) peerConfigs;
afters = lib.mapAttrsToList (name: peer: generateAfter name peer) peerConfigs;