{ pkgs, lib, config, ... }: let inherit (builtins) hasAttr readFile; inherit (pkgs.lib) unlinesAttrs; inherit (config) networking; inherit (config.users) users groups; in { networking.firewall.enable = false; systemd.services.disable-kernel-module-loading.after = [ "nftables.service" ]; systemd.services.nftables.serviceConfig.TimeoutStartSec = "20"; networking.nftables = { enable = true; ruleset = lib.mkBefore '' table inet filter { include "${../../../networking/nftables/filter.txt}" # A set containing the udp port(s) to which SSDP replies are allowed. set ssdp_out { type inet_service timeout 5s } chain net2fw { #udp dport mdns ip6 daddr ff02::fb counter accept comment "Accept mDNS" #udp dport mdns ip daddr 224.0.0.251 counter accept comment "Accept mDNS" #jump non-internet #ct state new add @connlimit { ip saddr ct count over 20 } counter tcp reject with tcp reset # Some .nix append rules here with: add rule inet filter net2fw ... } chain fw2net { tcp dport { 80, 443 } counter accept comment "HTTP" udp dport 123 skuid ${users.systemd-timesync.name} counter accept comment "NTP" tcp dport 1965 counter accept comment "Gemini" tcp dport 9418 counter accept comment "Git" # Some .nix append rules here with: add rule inet filter fw2net ... } chain input { type filter hook input priority filter policy drop iifname lo accept jump check-tcp ct state { established, related } accept jump accept-connectivity-input ct state invalid counter drop # admin services tcp dport 22 counter accept comment "SSH" udp dport 60000-61000 counter accept comment "Mosh" # Some .nix append gotos here with: add rule inet filter input iffname ... goto ... } chain forward { type filter hook forward priority filter policy drop #tcp flags syn tcp option maxseg size set rt mtu ct state { related, established } accept jump accept-connectivity-forward } chain output { type filter hook output priority filter policy drop oifname lo accept tcp flags syn tcp option maxseg size set rt mtu ct state { related, established } accept jump accept-connectivity-output tcp dport 22 counter accept comment "SSH" # Some .nix append gotos here with: add rule inet filter output oifname ... goto ... } } table inet nat { chain prerouting { type nat hook prerouting priority filter policy accept } chain postrouting { type nat hook postrouting priority srcnat policy accept } } ''; }; }