modules: move shared pc modules from desktop to pc

7 files changed, 153 insertions, 0 deletions

diff --git a/modules/pc/networking/default.nix b/modules/pc/networking/default.nix
new file mode 100644
index 0000000..f73f6ab
--- /dev/null
+++ b/modules/pc/networking/default.nix
@@ -0,0 +1,17 @@
+{
+  imports = [
+    ./dhcpcd.nix
+    ./loopback.nix
+    ./networkmanager.nix
+    ./optimise.nix
+    ./pia.nix
+    ./upnp.nix
+  ];
+
+  # https://discourse.nixos.org/t/rebuild-error-failed-to-start-network-manager-wait-online/41977/2
+  systemd.network.wait-online.enable = false;
+  boot.initrd.systemd.network.wait-online.enable = false;
+
+  # https://discourse.nixos.org/t/how-to-disable-networkmanager-wait-online-service-in-the-configuration-file/19963/2
+  systemd.services.NetworkManager-wait-online.enable = false;
+}
diff --git a/modules/pc/networking/dhcpcd.nix b/modules/pc/networking/dhcpcd.nix
new file mode 100644
index 0000000..f46b657
--- /dev/null
+++ b/modules/pc/networking/dhcpcd.nix
@@ -0,0 +1,12 @@
+{
+  networking.dhcpcd = {
+    wait = "background";
+
+    extraConfig = ''
+      noarp
+      nooption domain_name_servers, domain_name, domain_search, host_name
+      nooption ntp_servers
+      nohook resolv.conf, wpa_supplicant
+    '';
+  };
+}
diff --git a/modules/pc/networking/loopback.nix b/modules/pc/networking/loopback.nix
new file mode 100644
index 0000000..62e745e
--- /dev/null
+++ b/modules/pc/networking/loopback.nix
@@ -0,0 +1,7 @@
+{ config, ... }:
+{
+  boot = {
+    kernelModules = [ "v4l2loopback" ];
+    extraModulePackages = with config.boot.kernelPackages; [ v4l2loopback ];
+  };
+}
diff --git a/modules/pc/networking/networkmanager.nix b/modules/pc/networking/networkmanager.nix
new file mode 100644
index 0000000..7ef0e04
--- /dev/null
+++ b/modules/pc/networking/networkmanager.nix
@@ -0,0 +1,22 @@
+{ pkgs, ... }:
+{
+  environment.systemPackages = [ pkgs.networkmanagerapplet ];
+
+  networking.networkmanager = {
+    enable = true;
+    plugins = [ pkgs.networkmanager-openvpn ];
+    dns = "none"; # "systemd-resolved"
+    wifi.backend = "iwd";
+
+    unmanaged = [
+      "interface-name:tailscale*"
+      "interface-name:br-*"
+      "interface-name:rndis*"
+      "interface-name:docker*"
+      "interface-name:virbr*"
+      "interface-name:vboxnet*"
+      "interface-name:waydroid*"
+      "type:bridge"
+    ];
+  };
+}
diff --git a/modules/pc/networking/optimise.nix b/modules/pc/networking/optimise.nix
new file mode 100644
index 0000000..c6f2bec
--- /dev/null
+++ b/modules/pc/networking/optimise.nix
@@ -0,0 +1,73 @@
+{
+  boot = {
+    kernelModules = [
+      "tls"
+      "tcp_bbr"
+    ];
+
+    kernel.sysctl = {
+      # TCP hardening
+      # Prevent bogus ICMP errors from filling up logs.
+      "net.ipv4.icmp_ignore_bogus_error_responses" = 1;
+      # Reverse path filtering causes the kernel to do source validation of
+      # packets received from all interfaces. This can mitigate IP spoofing.
+      "net.ipv4.conf.default.rp_filter" = 1;
+      "net.ipv4.conf.all.rp_filter" = 1;
+      # Do not accept IP source route packets (we're not a router)
+      "net.ipv4.conf.all.accept_source_route" = 0;
+      "net.ipv6.conf.all.accept_source_route" = 0;
+      # Don't send ICMP redirects (again, we're on a router)
+      "net.ipv4.conf.all.send_redirects" = 0;
+      "net.ipv4.conf.default.send_redirects" = 0;
+      # Refuse ICMP redirects (MITM mitigations)
+      "net.ipv4.conf.all.accept_redirects" = 0;
+      "net.ipv4.conf.default.accept_redirects" = 0;
+      "net.ipv4.conf.all.secure_redirects" = 0;
+      "net.ipv4.conf.default.secure_redirects" = 0;
+      "net.ipv6.conf.all.accept_redirects" = 0;
+      "net.ipv6.conf.default.accept_redirects" = 0;
+      # Protects against SYN flood attacks
+      "net.ipv4.tcp_syncookies" = 1;
+      # Incomplete protection again TIME-WAIT assassination
+      "net.ipv4.tcp_rfc1337" = 1;
+      # And other stuff
+      "net.ipv4.conf.all.log_martians" = true;
+      "net.ipv4.conf.default.log_martians" = true;
+      "net.ipv4.icmp_echo_ignore_broadcasts" = true;
+      "net.ipv6.conf.default.accept_ra" = 0;
+      "net.ipv6.conf.all.accept_ra" = 0;
+      "net.ipv4.tcp_timestamps" = 0;
+
+      # TCP optimization
+      # TCP Fast Open is a TCP extension that reduces network latency by packing
+      # data in the sender’s initial TCP SYN. Setting 3 = enable TCP Fast Open for
+      # both incoming and outgoing connections:
+      "net.ipv4.tcp_fastopen" = 3;
+      # Bufferbloat mitigations + slight improvement in throughput & latency
+      "net.ipv4.tcp_congestion_control" = "bbr";
+      "net.core.default_qdisc" = "cake";
+
+      # Other stuff that I am too lazy to document
+      "net.core.optmem_max" = 65536;
+      "net.core.rmem_default" = 1048576;
+      "net.core.rmem_max" = 16777216;
+      "net.core.somaxconn" = 8192;
+      "net.core.wmem_default" = 1048576;
+      "net.core.wmem_max" = 16777216;
+      "net.ipv4.ip_local_port_range" = "16384 65535";
+      "net.ipv4.tcp_max_syn_backlog" = 8192;
+      "net.ipv4.tcp_max_tw_buckets" = 2000000;
+      "net.ipv4.tcp_mtu_probing" = 1;
+      "net.ipv4.tcp_rmem" = "4096 1048576 2097152";
+      "net.ipv4.tcp_slow_start_after_idle" = 0;
+      "net.ipv4.tcp_tw_reuse" = 1;
+      "net.ipv4.tcp_wmem" = "4096 65536 16777216";
+      "net.ipv4.udp_rmem_min" = 8192;
+      "net.ipv4.udp_wmem_min" = 8192;
+      "net.netfilter.nf_conntrack_generic_timeout" = 60;
+      "net.netfilter.nf_conntrack_max" = 1048576;
+      "net.netfilter.nf_conntrack_tcp_timeout_established" = 600;
+      "net.netfilter.nf_conntrack_tcp_timeout_time_wait" = 1;
+    };
+  };
+}
diff --git a/modules/pc/networking/pia.nix b/modules/pc/networking/pia.nix
new file mode 100644
index 0000000..d52dbf8
--- /dev/null
+++ b/modules/pc/networking/pia.nix
@@ -0,0 +1,10 @@
+{ secrets, ... }:
+{
+  services.pia = {
+    enable = true;
+
+    authUserPass = {
+      inherit (secrets.pia) username password;
+    };
+  };
+}
diff --git a/modules/pc/networking/upnp.nix b/modules/pc/networking/upnp.nix
new file mode 100644
index 0000000..998592a
--- /dev/null
+++ b/modules/pc/networking/upnp.nix
@@ -0,0 +1,12 @@
+{
+  services.miniupnpd = {
+    enable = true;
+    natpmp = true;
+    externalInterface = "enp42s0";
+
+    internalIPs = [
+      "enp42s0"
+      "wlan0"
+    ];
+  };
+}