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{ lib, ... }@flakeArg:
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# functions I wrote but didn’t end up using
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# feel free to use them & reference them directly
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{
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slaacSuffix =
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mac:
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let
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replaceChars = [
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" "
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"."
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":"
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"-"
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];
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rawMac = builtins.replaceStrings replaceChars (map (x: "") replaceChars) (lib.strings.toLower mac);
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invert7bit = {
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"0" = "2";
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"1" = "3";
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"2" = "0";
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"3" = "1";
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"4" = "6";
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"5" = "7";
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"6" = "4";
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"7" = "5";
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"8" = "a";
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"9" = "b";
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"a" = "8";
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"b" = "9";
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"c" = "e";
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"d" = "f";
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"e" = "c";
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"f" = "d";
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};
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inherit (builtins) substring;
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in
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assert builtins.match (lib.strings.replicate 12 "[0-9a-f]") rawMac;
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builtins.concatStringsSep "" [
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(substring 0 1 rawMac)
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(invert7bit.${substring 1 1 rawMac})
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(substring 2 2 rawMac)
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":"
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(substring 4 2 rawMac)
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"ff:f0"
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(substring 6 2 rawMac)
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":"
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(substring 8 4 rawMac)
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];
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}
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