75 lines
2.2 KiB
Nix
75 lines
2.2 KiB
Nix
{ hostName, config, lib, ... }:
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let
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hostConf = config.site.hosts.${hostName};
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upstreamInterfaces =
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lib.filterAttrs (_: { upstream, ... }: upstream != null)
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hostConf.interfaces;
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firstUpstreamInterface =
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if builtins.length (builtins.attrNames upstreamInterfaces) > 0
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then builtins.head (
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builtins.attrNames upstreamInterfaces
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)
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else null;
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enabled = (firstUpstreamInterface != null);
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in
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{
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systemd.network.networks = {
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core = {
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# systemd-networkd only requests Prefix Delegation via DHCPv6 on
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# the upstream interface if another interface is configured for it.
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# without this, the static ipv6 subnet won't be routed to us.
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networkConfig.DHCPv6PrefixDelegation = true;
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dhcpV6PrefixDelegationConfig = {
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SubnetId = "81";
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# because we have static addresses, we don't actually use this
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Assign = false;
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};
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};
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} // builtins.mapAttrs (_: { upstream, ... }: {
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DHCP = "yes";
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networkConfig.IPv6AcceptRA = true;
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dhcpV6Config.PrefixDelegationHint = "::/56";
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# Traffic Shaping
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extraConfig = ''
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[CAKE]
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Parent = root
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# DOCSIS overhead
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OverheadBytes = 18
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Bandwidth = ${toString upstream.upBandwidth}K
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'';
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}) upstreamInterfaces;
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networking.nat = lib.optionalAttrs enabled {
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enable = true;
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internalInterfaces = [ "core" ];
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externalInterface = firstUpstreamInterface;
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# Provide IPv6 upstream for everyone, using NAT66 when not from
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# our static prefixes
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extraCommands =
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builtins.concatStringsSep "\n" (
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map (net: ''
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ip6tables -t nat -X ${net}_nat || true
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ip6tables -t nat -N ${net}_nat
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${builtins.concatStringsSep "\n" (
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map (subnet: ''
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ip6tables -t nat -A ${net}_nat \
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-s ${subnet} \
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-j RETURN
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'') upstreamInterfaces.${net}.upstream.noNat.subnets6
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)}
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ip6tables -t nat -A ${net}_nat -j MASQUERADE
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ip6tables -t nat -A POSTROUTING \
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-o ${net} \
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-j ${net}_nat
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'') (builtins.attrNames upstreamInterfaces)
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);
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inherit (hostConf) forwardPorts;
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};
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}
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