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nixos/wireguard: add option to set firewall mark

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Wireguard can tag its packets with a firewall mark. This can be used for
firewalls or policy routing. This is very useful in some setups where
all traffic should go through a wireguard interface. The wireguard
packets cannot go through the wireguard interface and must be routed
differently, which can be done via the Firewall Mark.

The nixos option `config.networking.wireguard.interface.<name>.fwMark`
is of type `types.str` and not `types.int` to allow for specifying the
mark as a hexadecimal value.
This commit is contained in:
digital 2022-08-31 22:22:26 +02:00
parent 5d7d4a2d0a
commit 084509af8b
1 changed files with 15 additions and 0 deletions
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15
nixos/modules/services/networking/wireguard.nix
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@ -137,6 +137,20 @@ let
See [documentation](https://www.wireguard.com/netns/).
'';
};
fwMark = mkOption {
default = null;
type = with types; nullOr str;
example = "0x6e6978";
description = lib.mdDoc ''
Mark all wireguard packets originating from
this interface with the given firewall mark. The firewall mark can be
used in firewalls or policy routing to filter the wireguard packets.
This can be useful for setup where all traffic goes through the
wireguard tunnel, because the wireguard packets need to be routed
differently.
'';
};
};
};
@ -406,6 +420,7 @@ let
${concatStringsSep " " (
[ ''${wg} set "${name}" private-key "${privKey}"'' ]
++ optional (values.listenPort != null) ''listen-port "${toString values.listenPort}"''
++ optional (values.fwMark != null) ''fwmark "${values.fwMark}"''
)}
${ipPostMove} link set up dev "${name}"