hosts/mermet/networking.nix

   1 { lib, config, hostName, ... }:
   2 with builtins;
   3 let
   4   inherit (config) networking;
   5   netIface = "enp1s0";
   6   netIPv4 = "80.67.180.129";
   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   _module.args.ipv4 = netIPv4;
  23
  24   /* WARNING: using ipconfig (the ip= kernel parameter) IS NOT RELIABLE:
  25      a 91.216.110.35/32 becomes a 91.216.110.35/8
  26     boot.kernelParams = map
  27     (ip: "ip=${ip.clientIP}:${ip.serverIP}:${ip.gatewayIP}:${ip.netmask}:${ip.hostname}:${ip.device}:${ip.autoconf}")
  28     [ { clientIP = netIPv4; serverIP = "";
  29       gatewayIP = networking.defaultGateway.address;
  30       netmask = "255.255.255.255";
  31       hostname = ""; device = networking.defaultGateway.interface;
  32       autoconf = "off";
  33     }
  34     { clientIP = lanIPv4; serverIP = "";
  35       gatewayIP = "";
  36       netmask = "255.255.255.0";
  37       hostname = ""; device = "${lanIface}";
  38       autoconf = "off";
  39     }
  40     ];
  41   */
  42   /* DIY network config, but a right one */
  43   boot.initrd.preLVMCommands = ''
  44     set -x
  45
  46     # IPv4 net
  47     ip link set ${netIface} up
  48     ip address add ${netIPv4}/32 dev ${netIface}
  49     ip route add ${netIPv4Gateway} dev ${netIface}
  50     ip route add default via ${netIPv4Gateway} dev ${netIface}
  51
  52     # IPv4 lan
  53     ip link set ${lanIface} up
  54     ip address add ${lanIPv4}/32 dev ${lanIface}
  55     ip route add ${lanIPv4Gateway} dev ${lanIface}
  56     ip route add ${lanNet} dev ${lanIface} src ${lanIPv4} proto kernel
  57       # NOTE: ${lanIPv4}/24 would not work with initrd's ip, hence ${lanNet}
  58
  59     # IPv6 net
  60     #ip -6 address add ''${netIPv6} dev ${netIface}
  61     #ip -6 route add ''${netIPv6Gateway} dev ${netIface}
  62     #ip -6 route add default via ''${netIPv6Gateway} dev ${netIface}
  63
  64     ip -4 address
  65     ip -4 route
  66     #ip -6 address
  67     #ip -6 route
  68
  69     set +x
  70
  71     # Since boot.initrd.network's preLVMCommands won't set hasNetwork=1
  72     # we have to run the postCommands ourselves.
  73     ${config.boot.initrd.network.postCommands}
  74   '';
  75
  76   # Workaround https://github.com/NixOS/nixpkgs/issues/56822
  77   # TODO: the issue is now closed
  78   #boot.initrd.kernelModules = [ "ipv6" ];
  79
  80   # Useless without an out-of-band access, and unsecure
  81   # (though / may still be encrypted at this point).
  82   # boot.kernelParams = [ "boot.shell_on_fail" ];
  83
  84   # Disable IPv6 entirely until it's available
  85   boot.kernel.sysctl = {
  86     "net.ipv6.conf.${netIface}.disable_ipv6" = 1;
  87   };
  88
  89   services.knot.extraConfig = lib.mkBefore ''
  90     server:
  91       listen: ${netIPv4}@53
  92       #listen: ::@53
  93   '';
  94
  95   networking = {
  96     hostName = hostName;
  97     domain = "sourcephile.fr";
  98
  99     useDHCP = false;
 100     defaultGateway = {
 101       address = netIPv4Gateway;
 102       interface = "${netIface}";
 103     };
 104     /*
 105       defaultGateway6 = {
 106       address = netIPv6Gateway;
 107       interface = "${netIface}";
 108       };
 109     */
 110     #nameservers = [ ];
 111     nftables.ruleset = lib.mkAfter ''
 112       table inet filter {
 113         chain input {
 114           iifname ${netIface} goto input-net
 115           iifname ${lanIface} goto input-lan
 116         }
 117         chain output {
 118           oifname ${netIface} jump output-net
 119           oifname ${netIface} log level warn prefix "output-net: " counter drop
 120           oifname ${lanIface} goto output-lan
 121         }
 122       }
 123     '';
 124     interfaces.${netIface} = {
 125       useDHCP = false;
 126       ipv4.addresses = [{ address = netIPv4; prefixLength = 32; }];
 127       ipv4.routes = [{ address = networking.defaultGateway.address; prefixLength = 32; }];
 128
 129       /*
 130         ipv6.addresses = [ { address = netIPv6; prefixLength = 64; }
 131                        { address = "fe80::1"; prefixLength = 10; }
 132                      ];
 133         ipv6.routes    = [ { address = networking.defaultGateway6.address; prefixLength = 64; } ];
 134       */
 135     };
 136     interfaces.${lanIface} = {
 137       useDHCP = false;
 138       ipv4.addresses = [{ address = lanIPv4; prefixLength = 24; }];
 139       /*
 140         # FIXME: remove this /1 hack when the host will be racked at PTT
 141         ipv4.routes    = [ { address = "0.0.0.0";   prefixLength = 1; via = "192.168.1.1"; }
 142                        { address = "128.0.0.0"; prefixLength = 1; via = "192.168.1.1"; }
 143                        ];
 144       */
 145       /*
 146         ipv6.addresses = [ { address = "fe80::1"; prefixLength = 10; } ];
 147         ipv6.routes    = [ ];
 148       */
 149     };
 150     interfaces.enp3s0 = {
 151       useDHCP = false;
 152     };
 153   };
 154 }