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nixos/nat: substitute iptables for compat under nftables #84949

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nixos/nat: substitute iptables for compat under nftables #84949

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bqv
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@bqv bqv commented Apr 10, 2020

Motivation for this change

Currently, NAT will not work if you have nftables enabled (and therefore default firewall disabled (and therefore ip_tables unloaded/blacklisted)). This allows those using nftables to enable nat and have it work with minimal code change, thanks to the good work of those who created iptables-nftables-compat.

Debugging why my containers had no network access was a pain, this change fixed my issue, I'm using it right now.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.

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@ofborg ofborg bot added 6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 0 This PR does not cause any packages to rebuild on Linux labels Apr 10, 2020
mmilata
mmilata suggested changes Apr 17, 2020
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👍 for moving towards nftables! Can we use config.networking.firewall.package instead of hardcoding the package name?

Also, there's another reference to pkgs.iptables further down in nat.nix, shouldn't it be replaced as well?

@bqv bqv mentioned this pull request Apr 17, 2020
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bqv commented Apr 17, 2020

@mmilata Thanks, updated in the new PR :D I have to give up on this one because I deleted my fork by accident and now it's unlinked, so I can't push to it

@bqv bqv closed this Apr 17, 2020
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6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 0 This PR does not cause any packages to rebuild on Linux
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