729 lines
21 KiB
Nix
729 lines
21 KiB
Nix
{
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lib,
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# outputs,
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# config,
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pkgs,
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...
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}: let
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# NOTE: My goal is to be able to apply most of the common tweaks to the router
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# either live on the system for ad-hoc changes (such as forwarding a port for a
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# multiplayer game) or to tweak these values just below without reaching deeper
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# into the modules' implementation of these configuration values
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# NOTE: I could turn this into a cool NixOS module?
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# TODO: review https://francis.begyn.be/blog/nixos-home-router
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# TODO: more recent: https://github.com/ghostbuster91/blogposts/blob/a2374f0039f8cdf4faddeaaa0347661ffc2ec7cf/router2023-part2/main.md
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hostname = "router";
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domain = "h.lyte.dev";
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ip = "192.168.0.1";
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cidr = "${ip}/16";
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netmask = "255.255.255.0"; # see cidr
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dhcp_lease_space = {
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min = "192.168.0.30";
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max = "192.168.0.250";
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};
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interfaces = {
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wan = {
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name = "wan";
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mac = "00:01:2e:82:73:59";
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};
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lan = {
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name = "lan";
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mac = "00:01:2e:82:73:5a";
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};
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};
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hosts = {
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dragon = {
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ip = "192.168.0.10";
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};
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bald = {
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ip = "192.168.0.11";
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additionalHosts = [
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"ourcraft.lyte.dev"
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];
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};
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beefcake = {
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ip = "192.168.0.9";
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additionalHosts = [
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".beefcake.lan"
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"nix.h.lyte.dev"
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"idm.h.lyte.dev"
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"git.lyte.dev"
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"video.lyte.dev"
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"audio.lyte.dev"
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"a.lyte.dev"
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"bw.lyte.dev"
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"files.lyte.dev"
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"vpn.h.lyte.dev"
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"atuin.h.lyte.dev"
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"a.lyte.dev"
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];
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};
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};
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sysctl-entries = {
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"net.ipv4.conf.all.forwarding" = true;
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"net.ipv6.conf.all.forwarding" = true;
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"net.ipv4.conf.default.rp_filter" = 1;
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"net.ipv4.conf.${interfaces.wan.name}.rp_filter" = 1;
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"net.ipv4.conf.${interfaces.lan.name}.rp_filter" = 0;
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"net.ipv6.conf.${interfaces.wan.name}.accept_ra" = 2;
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"net.ipv6.conf.${interfaces.wan.name}.autoconf" = 1;
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"net.ipv6.conf.all.use_tempaddr" = 2;
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"net.ipv6.conf.default.use_tempaddr" = lib.mkForce 2;
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"net.ipv6.conf.${interfaces.wan.name}.use_tempaddr" = 2;
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# "net.ipv6.conf.${interfaces.wan.name}.addr_gen_mode" = 2;
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};
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in {
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imports = [
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{
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# hardware
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boot = {
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loader = {
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efi.canTouchEfiVariables = true;
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systemd-boot.enable = true;
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};
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initrd.availableKernelModules = ["xhci_pci"];
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initrd.kernelModules = [];
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kernelModules = ["kvm-intel"];
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extraModulePackages = [];
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};
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nixpkgs.hostPlatform = "x86_64-linux";
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powerManagement.cpuFreqGovernor = "performance";
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hardware.cpu.intel.updateMicrocode = true;
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}
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];
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environment.systemPackages = with pkgs; [
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iftop
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];
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boot.kernel.sysctl =
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sysctl-entries
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// {
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};
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networking = {
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hostName = hostname;
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domain = domain;
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# disable some of the sane defaults
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useDHCP = false;
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firewall.enable = false;
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# use systemd.network for network interface configuration
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useNetworkd = true;
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# maybe we need this?
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nat.enable = true;
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extraHosts = ''
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127.0.0.1 localhost
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127.0.0.2 ${hostname}.${domain} ${hostname}
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${ip} ${hostname}.${domain} ${hostname}
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::1 localhost ip6-localhost ip6-loopback
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ff02::1 ip6-allnodes
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ff02::2 ip6-allrouters
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'';
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# the main meat and potatoes for most routers, the firewall configuration
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# TODO: IPv6
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nftables = let
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inf = {
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lan = interfaces.lan.name;
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wan = interfaces.wan.name;
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};
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in {
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enable = true;
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checkRuleset = true;
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ruleset = with inf; ''
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table inet filter {
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# set LANv4 {
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# type ipv4_addr
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# flags interval
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# elements = { 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.0.0/16 }
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# }
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# set LANv6 {
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# type ipv6_addr
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# flags interval
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# elements = { fd00::/8, fe80::/10 }
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# }
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# TODO: maybe tailnet?
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# chain my_input_lan {
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# udp sport 1900 udp dport >= 1024 meta pkttype unicast limit rate 4/second burst 20 packets accept comment "Accept UPnP IGD port mapping reply"
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# udp sport netbios-ns udp dport >= 1024 meta pkttype unicast accept comment "Accept Samba Workgroup browsing replies"
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# }
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chain input {
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type filter hook input priority 0; policy drop;
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iif lo accept comment "Accept any localhost traffic"
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ct state invalid drop comment "Drop invalid connections"
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ct state established,related accept comment "Accept traffic originated from us"
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meta l4proto ipv6-icmp accept comment "Accept ICMPv6"
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meta l4proto icmp accept comment "Accept ICMP"
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ip protocol igmp accept comment "Accept IGMP"
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ip6 nexthdr icmpv6 icmpv6 type nd-router-solicit accept
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ip6 nexthdr icmpv6 icmpv6 type nd-router-advert accept comment "Accept IPv6 router advertisements"
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udp dport dhcpv6-client accept comment "IPv6 DHCP"
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ip6 nexthdr icmpv6 icmpv6 type { echo-request, nd-neighbor-solicit, nd-neighbor-advert, nd-router-solicit, nd-router-advert, mld-listener-query, destination-unreachable, packet-too-big, time-exceeded, parameter-problem } accept comment "Accept IPv6 ICMP and meta stuff"
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ip protocol icmp icmp type { echo-request, destination-unreachable, router-advertisement, time-exceeded, parameter-problem } accept comment "Accept IPv4 ICMP and meta stuff"
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ip protocol icmpv6 accept
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ip protocol icmp accept
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meta l4proto ipv6-icmp counter accept
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udp dport dhcpv6-client counter accept
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udp dport mdns ip6 daddr ff02::fb accept comment "Accept mDNS"
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udp dport mdns ip daddr 224.0.0.251 accept comment "Accept mDNS"
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tcp dport 2201 accept comment "Accept SSH on port 2201"
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tcp dport 53 accept comment "Accept DNS"
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udp dport 53 accept comment "Accept DNS"
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tcp dport { 80, 443 } accept comment "Allow HTTP/HTTPS to server (see nat prerouting)"
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udp dport { 80, 443 } accept comment "Allow QUIC to server (see nat prerouting)"
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tcp dport { 22 } accept comment "Allow SSH to server (see nat prerouting)"
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tcp dport { 25565 } accept comment "Allow Minecraft server connections (see nat prerouting)"
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iifname "${lan}" accept comment "Allow local network to access the router"
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iifname "tailscale0" accept comment "Allow local network to access the router"
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# ip6 saddr @LANv6 jump my_input_lan comment "Connections from private IP address ranges"
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# ip saddr @LANv4 jump my_input_lan comment "Connections from private IP address ranges"
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iifname "${wan}" counter drop comment "Drop all other unsolicited traffic from wan"
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}
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chain output {
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type filter hook output priority 0;
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accept
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}
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chain forward {
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type filter hook forward priority 0;
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accept
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}
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# chain forward {
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# type filter hook forward priority filter; policy drop;
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# iifname { "${lan}" } oifname { "${wan}" } accept comment "Allow trusted LAN to WAN"
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# iifname { "tailscale0" } oifname { "${wan}" } accept comment "Allow trusted LAN to WAN"
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# iifname { "${wan}" } oifname { "${lan}" } ct state { established, related } accept comment "Allow established back to LAN"
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# }
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}
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table ip nat {
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chain prerouting {
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type nat hook prerouting priority dstnat;
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iifname ${lan} accept
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iifname tailscale0 accept
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iifname ${wan} tcp dport {22} dnat to ${hosts.beefcake.ip}
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iifname ${wan} tcp dport {80, 443} dnat to ${hosts.beefcake.ip}
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iifname ${wan} udp dport {80, 443} dnat to ${hosts.beefcake.ip}
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iifname ${wan} tcp dport {26966} dnat to ${hosts.beefcake.ip}
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iifname ${wan} tcp dport {25565} dnat to ${hosts.bald.ip}
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iifname ${wan} udp dport {25565} dnat to ${hosts.bald.ip}
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}
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chain postrouting {
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type nat hook postrouting priority 100; policy accept;
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oifname "${wan}" masquerade
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}
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}
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'';
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};
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# NOTE: see flake.nix 'nnf.nixosModules.default'
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# nftables.firewall = let
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# me = config.networking.nftables.firewall.localZoneName;
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# in {
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# enable = true;
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# snippets.nnf-common.enable = true;
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# zones = {
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# ${interfaces.wan.name} = {
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# interfaces = [interfaces.wan.name interfaces.lan.name];
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# };
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# ${interfaces.lan.name} = {
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# parent = interfaces.wan.name;
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# ipv4Addresses = [cidr];
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# };
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# # banned = {
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# # ingressExpression = [
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# # "ip saddr @banlist"
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# # "ip6 saddr @banlist6"
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# # ];
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# # egressExpression = [
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# # "ip daddr @banlist"
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# # "ip6 daddr @banlist6"
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# # ];
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# # };
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# };
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# rules = {
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# dhcp = {
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# from = "all";
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# to = [hosts.beefcake.ip];
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# allowedTCPPorts = [67];
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# allowedUDPPorts = [67];
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# };
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# http = {
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# from = "all";
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# to = [me];
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# allowedTCPPorts = [80 443];
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# };
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# router-ssh = {
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# from = "all";
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# to = [me];
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# allowedTCPPorts = [2201];
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# };
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# server-ssh = {
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# from = "all";
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# to = [hosts.beefcake.ip];
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# allowedTCPPorts = [22];
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# };
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# };
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# };
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};
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systemd.network = {
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enable = true;
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# wait-online.anyInterface = true;
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# configure known names for the network interfaces
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links = {
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"20-${interfaces.wan.name}" = {
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enable = true;
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matchConfig = {
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MACAddress = interfaces.wan.mac;
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};
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linkConfig = {
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Name = interfaces.wan.name;
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};
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};
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"30-${interfaces.lan.name}" = {
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enable = true;
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matchConfig = {
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MACAddress = interfaces.lan.mac;
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};
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linkConfig = {
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Name = interfaces.lan.name;
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};
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};
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};
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# configure networks for the interfaces
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networks = {
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# LAN configuration is very simple and mostly forwarded between
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# TODO: IPv6
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"50-${interfaces.lan.name}" = {
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matchConfig.Name = "${interfaces.lan.name}";
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linkConfig = {
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RequiredForOnline = "enslaved";
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# Name = interfaces.lan.name;
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};
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address = [
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cidr
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];
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networkConfig = {
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# Description = "LAN network - connection to switch in house";
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ConfigureWithoutCarrier = true;
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# IPv6AcceptRA = false;
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IPv6SendRA = true;
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DHCPv6PrefixDelegation = true;
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};
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};
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# WAN configuration requires DHCP to get addresses
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# we also disable some options to be certain we retain as much networking
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# control as we reasonably can, such as not letting the ISP determine our
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# hostname or DNS configuration
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# TODO: IPv6 (prefix delegation)
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"40-${interfaces.wan.name}" = {
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matchConfig.Name = "${interfaces.wan.name}";
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networkConfig = {
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Description = "WAN network - connection to fiber ISP jack";
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DHCP = true;
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# IPv6AcceptRA = true;
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# IPv6PrivacyExtensions = true;
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# IPForward = true;
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};
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dhcpV6Config = {
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# ForceDHCPv6PDOtherInformation = true;
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# UseHostname = false;
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# UseDNS = false;
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# UseNTP = false;
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PrefixDelegationHint = "::/56";
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};
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dhcpV4Config = {
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Hostname = hostname;
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UseHostname = false;
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UseDNS = false;
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UseNTP = false;
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UseSIP = false;
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UseRoutes = false;
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UseGateway = true;
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};
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linkConfig = {
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RequiredForOnline = "routable";
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# Name = interfaces.wan.name;
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};
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ipv6AcceptRAConfig = {
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DHCPv6Client = "always";
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UseDNS = false;
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};
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};
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};
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};
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services.resolved.enable = false;
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# dnsmasq serves as our DHCP and DNS server
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# almost all the configuration should be derived from the values at the top of
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# this file
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services.dnsmasq = {
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enable = true;
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settings = {
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listen-address = "::,127.0.0.1,${ip}";
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port = 53;
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# dhcp-authoritative = true;
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# dnssec = true;
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enable-ra = true;
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server = ["1.1.1.1" "9.9.9.9" "8.8.8.8"];
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domain-needed = true;
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bogus-priv = true;
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no-resolv = true;
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cache-size = "10000";
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dhcp-range = with dhcp_lease_space; [
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"${interfaces.lan.name},${min},${max},${netmask},24h"
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"::,constructor:${interfaces.lan.name},ra-stateless,ra-names,4h"
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];
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except-interface = interfaces.wan.name;
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interface = interfaces.lan.name;
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dhcp-host =
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[
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]
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++ (lib.attrsets.mapAttrsToList (name: {
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ip,
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identifier ? name,
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time ? "12h",
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...
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}: "${name},${ip},${identifier},${time}")
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hosts);
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address =
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[
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"/${hostname}.${domain}/${ip}"
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]
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++ (lib.lists.flatten (lib.attrsets.mapAttrsToList (name: {
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ip,
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additionalHosts ? [],
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identifier ? name,
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time ? "12h",
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}: [
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"/${name}.${domain}/${ip}"
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(lib.lists.forEach additionalHosts (h: "/${h}/${ip}"))
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])
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hosts));
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# local domains
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local = "/lan/";
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domain = "lan";
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expand-hosts = true;
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# don't use /etc/hosts as this would advertise surfer as localhost
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no-hosts = true;
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};
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};
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# since the home network reserves port 22 for ssh to the big server and to
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# gitea, the router uses port 2201 for ssh
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services.openssh.listenAddresses = [
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{
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addr = "0.0.0.0";
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port = 2201;
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}
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{
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addr = "0.0.0.0";
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port = 22;
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}
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{
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addr = "[::]";
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port = 2201;
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}
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{
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addr = "[::]";
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port = 22;
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}
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];
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services.fail2ban.enable = true;
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system.stateVersion = "24.05";
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# NOTE: everything from here on is deprecated or old stuff
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# TODO: may not be strictly necessary for IPv6?
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# TODO: also may not even be the best implementation?
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# services.radvd = {
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# enable = false;
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# # NOTE: this config is just the default arch linux config I think and may
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# # need tweaking? this is what I had on the arch linux router, though :shrug:
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# config = ''
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# interface lo
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# {
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# AdvSendAdvert on;
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# MinRtrAdvInterval 3;
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# MaxRtrAdvInterval 10;
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# AdvDefaultPreference low;
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# AdvHomeAgentFlag off;
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# prefix 2001:db8:1:0::/64
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# {
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# AdvOnLink on;
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# AdvAutonomous on;
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# AdvRouterAddr off;
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# };
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# prefix 0:0:0:1234::/64
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# {
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# AdvOnLink on;
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# AdvAutonomous on;
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# AdvRouterAddr off;
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# Base6to4Interface ppp0;
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# AdvPreferredLifetime 120;
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# AdvValidLifetime 300;
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# };
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# route 2001:db0:fff::/48
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# {
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# AdvRoutePreference high;
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# AdvRouteLifetime 3600;
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# };
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# RDNSS 2001:db8::1 2001:db8::2
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# {
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# AdvRDNSSLifetime 30;
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# };
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# DNSSL branch.example.com example.com
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# {
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# AdvDNSSLLifetime 30;
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# };
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# };
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# '';
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# };
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|
|
# TODO: old config, should be deleted ASAP
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|
# services.dnsmasq = {
|
|
# enable = false;
|
|
# settings = {
|
|
# # server endpoints
|
|
# listen-address = "::1,127.0.0.1,${ip}";
|
|
# port = "53";
|
|
|
|
# # DNS cache entries
|
|
# cache-size = "10000";
|
|
|
|
# # local domain entries
|
|
# local = "/lan/";
|
|
# domain = "lan";
|
|
# expand-hosts = true;
|
|
|
|
# dhcp-authoritative = true;
|
|
|
|
# conf-file = "/usr/share/dnsmasq/trust-anchors.conf";
|
|
# dnssec = true;
|
|
|
|
# except-interface = "${wan_if}";
|
|
# interface = "${lan_if}";
|
|
|
|
# enable-ra = true;
|
|
|
|
# # dhcp-option = "121,${cidr},${ip}";
|
|
|
|
# dhcp-range = [
|
|
# "lan,${dhcp_lease_space.min},${dhcp_lease_space.max},${netmask},10m"
|
|
# "tag:${lan_if},::1,constructor:${lan_if},ra-names,12h"
|
|
# ];
|
|
|
|
# dhcp-host = [
|
|
# "${hosts.dragon.host},${hosts.dragon.ip},12h"
|
|
# "${hosts.beefcake.host},${hosts.beefcake.ip},12h"
|
|
# ];
|
|
|
|
# # may need to go in /etc/hosts (networking.extraHosts), too?
|
|
# address = [
|
|
# "/video.lyte.dev/192.168.0.9"
|
|
# "/git.lyte.dev/192.168.0.9"
|
|
# "/bw.lyte.dev/192.168.0.9"
|
|
# "/files.lyte.dev/192.168.0.9"
|
|
# "/vpn.h.lyte.dev/192.168.0.9"
|
|
# "/.h.lyte.dev/192.168.0.9"
|
|
# ];
|
|
|
|
# server = [
|
|
# "${ip}"
|
|
# "8.8.8.8"
|
|
# "8.8.4.4"
|
|
# "1.1.1.1"
|
|
# "1.0.0.1"
|
|
# ];
|
|
# };
|
|
# };
|
|
|
|
# TODO: old config, should be deleted ASAP
|
|
# nftables = {
|
|
# enable = false;
|
|
# flushRuleset = true;
|
|
|
|
# tables = {
|
|
# filter = {
|
|
# family = "inet";
|
|
# content = ''
|
|
# chain input {
|
|
# # type filter hook input priority filter; policy accept;
|
|
# type filter hook input priority 0;
|
|
|
|
# # anything from loopback interface
|
|
# iifname "lo" accept
|
|
|
|
# # accept traffic we originated
|
|
# ct state { established, related } counter accept
|
|
# ct state invalid counter drop
|
|
|
|
# # ICMP
|
|
# ip6 nexthdr icmpv6 icmpv6 type { echo-request, nd-neighbor-solicit, nd-neighbor-advert, nd-router-solicit, nd-router-advert, mld-listener-query, destination-unreachable, packet-too-big, time-exceeded, parameter-problem } counter accept
|
|
# ip protocol icmp icmp type { echo-request, destination-unreachable, router-advertisement, time-exceeded, parameter-problem } counter accept
|
|
# ip protocol icmpv6 counter accept
|
|
# ip protocol icmp counter accept
|
|
# meta l4proto ipv6-icmp counter accept
|
|
# udp dport dhcpv6-client counter accept
|
|
|
|
# tcp dport { 64022, 22, 53, 67, 25565 } counter accept
|
|
# udp dport { 64020, 22, 53, 67 } counter accept
|
|
|
|
# # iifname "iot" ip saddr $iot-ip tcp dport { llmnr } counter accept
|
|
# # iifname "iot" ip saddr $iot-ip udp dport { mdns, llmnr } counter accept
|
|
# iifname "${lan_if}" tcp dport { llmnr } counter accept
|
|
# iifname "${lan_if}" udp dport { mdns, llmnr } counter accept
|
|
|
|
# counter drop
|
|
# }
|
|
|
|
# # allow all outgoing
|
|
# chain output {
|
|
# type filter hook output priority 0;
|
|
# accept
|
|
# }
|
|
|
|
# chain forward {
|
|
# type filter hook forward priority 0;
|
|
# accept
|
|
# }
|
|
# '';
|
|
# };
|
|
|
|
# nat = {
|
|
# family = "ip";
|
|
# content = ''
|
|
# set masq_saddr {
|
|
# type ipv4_addr
|
|
# flags interval
|
|
# elements = { ${cidr} }
|
|
# }
|
|
|
|
# map map_port_ipport {
|
|
# type inet_proto . inet_service : ipv4_addr . inet_service
|
|
# }
|
|
|
|
# chain prerouting {
|
|
# iifname ${lan_if} accept
|
|
|
|
# type nat hook prerouting priority dstnat + 1; policy accept;
|
|
# fib daddr type local dnat ip addr . port to meta l4proto . th dport map @map_port_ipport
|
|
|
|
# iifname ${wan_if} tcp dport { 22, 80, 443, 25565, 64022 } dnat to ${hosts.beefcake.ip}
|
|
# iifname ${wan_if} udp dport { 64020 } dnat to ${hosts.beefcake.ip}
|
|
|
|
# # iifname ${wan_if} tcp dport { 25565 } dnat to 192.168.0.244
|
|
# # iifname ${wan_if} udp dport { 25565 } dnat to 192.168.0.244
|
|
|
|
# # router
|
|
# iifname ${wan_if} tcp dport { 2201 } dnat to ${ip}
|
|
# }
|
|
|
|
# chain output {
|
|
# type nat hook output priority -99; policy accept;
|
|
# ip daddr != 127.0.0.0/8 oif "lo" dnat ip addr . port to meta l4proto . th dport map @map_port_ipport
|
|
# }
|
|
|
|
# chain postrouting {
|
|
# type nat hook postrouting priority srcnat + 1; policy accept;
|
|
# oifname ${lan_if} masquerade
|
|
# ip saddr @masq_saddr masquerade
|
|
# }
|
|
# '';
|
|
# };
|
|
# };
|
|
# };
|
|
|
|
# TODO: also want to try to avoid using dhcpcd for IPv6 since systemd-networkd
|
|
# should be sufficient?
|
|
# dhcpcd = {
|
|
# enable = false;
|
|
# extraConfig = ''
|
|
# duid
|
|
|
|
# # No way.... https://github.com/NetworkConfiguration/dhcpcd/issues/36#issuecomment-954777644
|
|
# # issues caused by guests with oneplus devices
|
|
# noarp
|
|
|
|
# persistent
|
|
# vendorclassid
|
|
|
|
# option domain_name_servers, domain_name, domain_search
|
|
# option classless_static_routes
|
|
# option interface_mtu
|
|
# option host_name
|
|
# #option ntp_servers
|
|
|
|
# require dhcp_server_identifier
|
|
# slaac private
|
|
# noipv4ll
|
|
# noipv6rs
|
|
|
|
# static domain_name_servers=${ip}
|
|
|
|
# interface ${wan_if}
|
|
# gateway
|
|
# ipv6rs
|
|
# iaid 1
|
|
# # option rapid_commit
|
|
# # ia_na 1
|
|
# ia_pd 1 ${lan_if}
|
|
|
|
# interface ${lan_if}
|
|
# static ip_address=${cidr}
|
|
# static routers=${ip}
|
|
# static domain_name_servers=${ip}
|
|
# '';
|
|
# };
|
|
}
|