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nixos/wireguard: add option to set mtu

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Some networks can only transfer packets with a lower than normal maximum
transfer unit size. In these cases, it is necessary to set a MTU that
works for the given upstream network.
This commit is contained in:
digital 2022-08-31 22:22:40 +02:00
parent 084509af8b
commit eb49174f7b
1 changed files with 14 additions and 0 deletions
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14
nixos/modules/services/networking/wireguard.nix
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@ -151,6 +151,19 @@ let
differently.
'';
};
mtu = mkOption {
default = null;
type = with types; nullOr int;
example = 1280;
description = lib.mdDoc ''
Set the maximum transmission unit in bytes for the wireguard
interface. Beware that the wireguard packets have a header that may
add up to 80 bytes to the mtu. By default, the MTU is (1500 - 80) =
1420. However, if the MTU of the upstream network is lower, the MTU
of the wireguard network has to be adjusted as well.
'';
};
};
};
@ -412,6 +425,7 @@ let
${ipPreMove} link add dev "${name}" type wireguard
${optionalString (values.interfaceNamespace != null && values.interfaceNamespace != values.socketNamespace) ''${ipPreMove} link set "${name}" netns "${ns}"''}
${optionalString (values.mtu != null) ''${ipPreMove} link set "${name}" mtu ${toString values.mtu}''}
${concatMapStringsSep "\n" (ip:
''${ipPostMove} address add "${ip}" dev "${name}"''