hosts/mermet/networking.nix

   1 { pkgs, lib, config, hostName, ipv4, hosts, ... }:
   2 with builtins;
   3 let
   4   inherit (config) networking users;
   5   netIface       = "enp1s0";
   6   netIPv4        = ipv4;
   7   netIPv4Gateway = "80.67.180.134";
   8   #netIPv6        = "2001:912:400:104::35";
   9   #netIPv6Gateway = "2001:912:400:104::1";
  10   lanIface       = "enp2s0";
  11   lanIPv4        = "192.168.1.214";
  12   lanNet         = "192.168.1.0/24";
  13   lanIPv4Gateway = "192.168.1.1";
  14 in
  15 {
  16 imports = [
  17   networking/nftables.nix
  18   networking/ssh.nix
  19   networking/wireguard.nix
  20 ];
  21
  22 /* WARNING: using ipconfig (the ip= kernel parameter) IS NOT RELIABLE:
  23    a 91.216.110.35/32 becomes a 91.216.110.35/8
  24 boot.kernelParams = map
  25   (ip: "ip=${ip.clientIP}:${ip.serverIP}:${ip.gatewayIP}:${ip.netmask}:${ip.hostname}:${ip.device}:${ip.autoconf}")
  26   [ { clientIP = netIPv4; serverIP = "";
  27       gatewayIP = networking.defaultGateway.address;
  28       netmask = "255.255.255.255";
  29       hostname = ""; device = networking.defaultGateway.interface;
  30       autoconf = "off";
  31     }
  32     { clientIP = lanIPv4; serverIP = "";
  33       gatewayIP = "";
  34       netmask = "255.255.255.0";
  35       hostname = ""; device = "${lanIface}";
  36       autoconf = "off";
  37     }
  38   ];
  39 */
  40 /* DIY network config, but a right one */
  41 boot.initrd.preLVMCommands = ''
  42   set -x
  43
  44   # IPv4 net
  45   ip link set ${netIface} up
  46   ip address add ${netIPv4}/32 dev ${netIface}
  47   ip route add ${netIPv4Gateway} dev ${netIface}
  48   ip route add default via ${netIPv4Gateway} dev ${netIface}
  49
  50   # IPv4 lan
  51   ip link set ${lanIface} up
  52   ip address add ${lanIPv4}/32 dev ${lanIface}
  53   ip route add ${lanIPv4Gateway} dev ${lanIface}
  54   ip route add ${lanNet} dev ${lanIface} src ${lanIPv4} proto kernel
  55     # NOTE: ${lanIPv4}/24 would not work with initrd's ip, hence ${lanNet}
  56
  57   # IPv6 net
  58   #ip -6 address add ''${netIPv6} dev ${netIface}
  59   #ip -6 route add ''${netIPv6Gateway} dev ${netIface}
  60   #ip -6 route add default via ''${netIPv6Gateway} dev ${netIface}
  61
  62   ip -4 address
  63   ip -4 route
  64   #ip -6 address
  65   #ip -6 route
  66
  67   set +x
  68
  69   # Since boot.initrd.network's preLVMCommands won't set hasNetwork=1
  70   # we have to run the postCommands ourselves.
  71   ${config.boot.initrd.network.postCommands}
  72 '';
  73
  74 # Workaround https://github.com/NixOS/nixpkgs/issues/56822
  75 # TODO: the issue is now closed
  76 #boot.initrd.kernelModules = [ "ipv6" ];
  77
  78 # Useless without an out-of-band access, and unsecure
  79 # (though / may still be encrypted at this point).
  80 # boot.kernelParams = [ "boot.shell_on_fail" ];
  81
  82 # Disable IPv6 entirely until it's available
  83 boot.kernel.sysctl = {
  84   "net.ipv6.conf.${netIface}.disable_ipv6" = 1;
  85 };
  86
  87 services.knot.extraConfig = lib.mkBefore ''
  88   server:
  89     listen: ${netIPv4}@53
  90     #listen: ::@53
  91 '';
  92
  93 networking = {
  94   hostName = hostName;
  95   domain = "sourcephile.fr";
  96
  97   useDHCP = false;
  98   defaultGateway = {
  99     address = netIPv4Gateway;
 100     interface = "${netIface}";
 101   };
 102   /*
 103   defaultGateway6 = {
 104     address = netIPv6Gateway;
 105     interface = "${netIface}";
 106   };
 107   */
 108   #nameservers = [ ];
 109   nftables.ruleset = lib.mkAfter ''
 110     table inet filter {
 111       chain input {
 112         iifname ${netIface} goto input-net
 113         iifname ${lanIface} goto input-lan
 114       }
 115       chain output {
 116         oifname ${netIface} jump output-net
 117         oifname ${netIface} log level warn prefix "output-net: " counter drop
 118         oifname ${lanIface} goto output-lan
 119       }
 120     }
 121   '';
 122   interfaces.${netIface} = {
 123     useDHCP = false;
 124     ipv4.addresses = [ { address = netIPv4; prefixLength = 32; } ];
 125     ipv4.routes    = [ { address = networking.defaultGateway.address; prefixLength = 32; } ];
 126
 127     /*
 128     ipv6.addresses = [ { address = netIPv6; prefixLength = 64; }
 129                        { address = "fe80::1"; prefixLength = 10; }
 130                      ];
 131     ipv6.routes    = [ { address = networking.defaultGateway6.address; prefixLength = 64; } ];
 132     */
 133   };
 134   interfaces.${lanIface} = {
 135     useDHCP = false;
 136     ipv4.addresses = [ { address = lanIPv4; prefixLength = 24; } ];
 137     /*
 138     # FIXME: remove this /1 hack when the host will be racked at PTT
 139     ipv4.routes    = [ { address = "0.0.0.0";   prefixLength = 1; via = "192.168.1.1"; }
 140                        { address = "128.0.0.0"; prefixLength = 1; via = "192.168.1.1"; }
 141                        ];
 142     */
 143     /*
 144     ipv6.addresses = [ { address = "fe80::1"; prefixLength = 10; } ];
 145     ipv6.routes    = [ ];
 146     */
 147   };
 148   interfaces.enp3s0 = {
 149     useDHCP = false;
 150   };
 151 };
 152 }