150 lines
4 KiB
Nix
150 lines
4 KiB
Nix
{ hostName }:
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{ ... }:
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let
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wan = "end0";
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lan = "enp1s0";
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bridge = "br-lan";
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in
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{
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boot.kernel = {
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sysctl = {
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"net.ipv4.conf.all.forwarding" = true;
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"net.ipv6.conf.all.forwarding" = false;
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"net.ipv4.conf.default.rp_filter" = 1;
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"net.ipv4.conf.${wan}.rp_filter" = 1;
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"net.ipv4.conf.${bridge}.rp_filter" = 0;
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};
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};
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systemd.network = {
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wait-online.anyInterface = true;
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netdevs = {
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"20-${bridge}" = {
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netdevConfig = {
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Kind = "bridge";
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Name = bridge;
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};
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};
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};
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networks = {
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"10-${wan}" = {
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matchConfig.Name = wan;
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linkConfig.RequiredForOnline = "routable";
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networkConfig = {
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DHCP = "ipv4";
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IPv6AcceptRA = true;
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DNSOverTLS = true;
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DNSSEC = true;
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IPv6PrivacyExtensions = false;
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IPForward = true;
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};
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};
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"30-${lan}" = {
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matchConfig.Name = lan;
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linkConfig.RequiredForOnline = "enslaved";
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networkConfig = {
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Bridge = bridge;
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ConfigureWithoutCarrier = true;
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};
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};
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"40-${bridge}" = {
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matchConfig.Name = bridge;
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bridgeConfig = { };
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address = [
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"192.168.20.1/24"
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];
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networkConfig = {
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ConfigureWithoutCarrier = true;
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};
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linkConfig.RequiredForOnline = "no";
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};
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};
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};
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networking = {
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inherit hostName;
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useNetworkd = true;
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useDHCP = false;
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nat.enable = false;
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firewall.enable = false;
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nftables = {
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enable = true;
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checkRuleset = false;
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ruleset = ''
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define WAN=${wan}
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define LAN=${lan}
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define BRIDGE=${bridge}
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table inet filter {
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chain input {
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type filter hook input priority 0; policy drop;
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iifname $BRIDGE accept comment "Allow local network to access the router"
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iifname $WAN ct state { established, related } accept comment "Allow established traffic"
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iifname $WAN icmp type { echo-request, destination-unreachable, time-exceeded } counter accept comment "icmp stuff"
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iifname $WAN tcp dport 3128 accept comment "Allow SSH in"
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iifname $WAN counter drop comment "Drop all other traffic from wan"
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iifname "lo" accept comment "Accept everything from loopback"
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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 $BRIDGE oifname $BRIDGE accept comment "Allow forwarding internal traffic"
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iifname $WAN oifname $BRIDGE tcp dport { 22, 80, 443, 27750 } accept comment "Allow forwarding external traffic to services"
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iifname $BRIDGE oifname $WAN accept comment "Allow trusted LAN to WAN"
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iifname $WAN oifname $BRIDGE ct state { established, related } accept comment "Allow established traffic"
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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 -100; policy accept;
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fib daddr type local tcp dport { 80, 443 } dnat to 192.168.20.200
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fib daddr type local tcp dport 22 dnat to 192.168.20.201:2222
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fib daddr type local tcp dport 27750 dnat to 192.168.20.202:27750
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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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ip saddr 192.168.20.0/24 masquerade
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}
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}
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'';
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};
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};
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services.openssh.ports = [ 22 3128 ];
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services.resolved.enable = false;
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services.dnsmasq = {
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enable = true;
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settings = {
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server = [ "9.9.9.9" "9.9.9.10" ];
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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 = 1000;
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dhcp-range = [ "br-lan,192.168.20.50,192.168.20.90,24h" ];
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interface = "br-lan";
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dhcp-host = "192.168.20.1";
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local = "/lan/";
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domain = "lan";
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expand-hosts = true;
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no-hosts = true;
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address = "/router.lan/192.168.20.1";
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};
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};
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services.irqbalance.enable = false;
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}
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