Better Server cfg

modules/server/nftables/default.nix

@@ -0,0 +1,40 @@
+
+
+{ config, lib, ... }:{
+  config = lib.mkIf (config.syscfg.server.nftables.enable) {
+    boot.kernel.sysctl = {
+      "net.ipv4.ip_forward" = 1;
+      "net.ipv6.conf.all.forwarding" = 1;
+    };
+
+    networking.nftables.enable = true;
+    networking.nftables.ruleset = ''
+      table inet nat {
+        chain prerouting {
+          type nat hook prerouting priority dstnat; policy accept;
+          
+          ${lib.concatMapStringsSep "\n" (rule:
+            let
+              srcInt = builtins.elemAt rule 0;
+              dstAddr4 = builtins.elemAt rule 1;
+              dstAddr6 = builtins.elemAt rule 2;
+              srcPort = toString (builtins.elemAt rule 3);
+              dstPort = toString (builtins.elemAt rule 4);
+            in ''
+                iifname "${srcInt}" tcp dport ${srcPort} counter dnat ip to ${dstAddr4}:${dstPort}
+                iifname "${srcInt}" udp dport ${srcPort} counter dnat ip to ${dstAddr4}:${dstPort}
+
+                iifname "${srcInt}" tcp dport ${srcPort} counter dnat ip6 to [${dstAddr6}]:${dstPort}
+                iifname "${srcInt}" udp dport ${srcPort} counter dnat ip6 to [${dstAddr6}]:${dstPort}
+            ''
+          ) config.syscfg.server.nftables.ports}
+        }
+        
+        chain postrouting {
+          type nat hook postrouting priority srcnat; policy accept;
+          oifname { ${lib.concatMapStringsSep ", " (iface: ''"${iface}"'') config.syscfg.server.nftables.ifs} } masquerade
+        }
+      }
+    '';
+  };
+}