aboutsummaryrefslogtreecommitdiff
path: root/nixos/routers/router.nix
blob: 0139c6f31b8a9691bef9de718d22c04d4ce25ac1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
{
  config,
  lib,
  pkgs,
  ...
}:
with lib; let
  cnf = config.cynerd.router;
in {
  options = {
    cynerd.router = {
      enable = mkOption {
        type = types.bool;
        default = false;
        description = "Enable router support";
      };
      wan = mkOption {
        type = types.str;
        description = "Interface for the router's WAN";
      };
      lanIP = mkOption {
        type = types.str;
        description = "LAN IP address";
      };
      dynIPStart = mkOption {
        type = types.ints.between 0 256;
        default = 100;
        description = "Offset for the dynamic IPv4 addresses";
      };
      dynIPCount = mkOption {
        type = types.ints.between 0 256;
        default = 100;
        description = "Number of dynamically assigned IPv4 addresses";
      };
      lanPrefix = mkOption {
        type = types.ints.between 0 32;
        default = 24;
        description = "LAN IP network prefix length";
      };
    };
  };

  config = mkIf cnf.enable {
    networking = {
      interfaces = {
        brlan.ipv4.addresses = [
          {
            address = cnf.lanIP;
            prefixLength = cnf.lanPrefix;
          }
        ];
        brguest.ipv4.addresses = [
          {
            address = "192.168.1.1";
            prefixLength = 24;
          }
        ];
      };
      vlans = {
        "brlan.guest" = {
          interface = "brlan";
          id = 100;
        };
      };
      bridges = {
        brlan.interfaces = [];
        brguest.interfaces = ["brlan.guest"];
      };
      nat = {
        enable = true;
        externalInterface = cnf.wan;
        internalInterfaces = ["brlan" "brguest"];
      };
      dhcpcd = {
        allowInterfaces = [cnf.wan];
        extraConfig = ''
          duid
          noipv6rs
          waitip 6

          interface ${cnf.wan}
          ipv6rs
          iaid 1

          ia_pd 1 brlan
          #ia_pd 1/::/64 LAN/0/64
        '';
      };
      nameservers = ["1.1.1.1" "8.8.8.8"];
    };

    services.kea = {
      dhcp4 = {
        enable = true;
        settings = {
          lease-database = {
            name = "/var/lib/kea/dhcp4.leases";
            persist = true;
            type = "memfile";
          };
          valid-lifetime = 4000;
          renew-timer = 1000;
          rebind-timer = 2000;
          interfaces-config = {
            interfaces = ["brlan" "brguest"];
            service-sockets-max-retries = -1;
          };
          option-data = [
            {
              name = "domain-name-servers";
              data = "1.1.1.1, 8.8.8.8";
            }
          ];
          subnet4 = [
            {
              interface = "brlan";
              subnet = "${ipv4.prefix2ip cnf.lanIP cnf.lanPrefix}/${toString cnf.lanPrefix}";
              pools = let
                ip_start = ipv4.ipAdd cnf.lanIP cnf.lanPrefix cnf.dynIPStart;
                ip_end = ipv4.ipAdd cnf.lanIP cnf.lanPrefix (cnf.dynIPStart + cnf.dynIPCount);
              in [{pool = "${ip_start} - ${ip_end}";}];
              option-data = [
                {
                  name = "routers";
                  data = cnf.lanIP;
                }
              ];
              reservations = [
                {
                  duid = "e4:6f:13:f3:d5:be";
                  ip-address = ipv4.ipAdd cnf.lanIP cnf.lanPrefix 60;
                }
              ];
            }
            {
              interface = "brguest";
              subnet = "192.168.1.0/24";
              pools = [{pool = "192.168.1.50 - 192.168.1.254";}];
              "option-data" = [
                {
                  name = "routers";
                  data = "192.168.1.1";
                }
              ];
            }
          ];
        };
      };
    };
    systemd.services.kea-dhcp4-server.after = [
      "sys-subsystem-net-devices-brlan.device"
      "sys-subsystem-net-devices-brguest.device"
    ];

    services.radvd = {
      enable = true;
      config = ''
        interface brlan {
          AdvSendAdvert on;
          MinRtrAdvInterval 3;
          MaxRtrAdvInterval 10;
          prefix ::/64 {
            AdvOnLink on;
            AdvAutonomous on;
            AdvRouterAddr on;
          };
          RDNSS 2001:4860:4860::8888 2001:4860:4860::8844 {
          };
        };
      '';
    };

    services.kresd = {enable = false;};

    networking.nftables.enable = true;
    networking.firewall = {
      filterForward = true;
      extraForwardRules = ''
        iifname "brguest" oifname != "${cnf.wan}" drop comment "prevent guest to access lan"
      '';
    };
  };
}