example config for ppoe router
hard cases make bad law
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nat.nft
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nat.nft
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#!/usr/bin/nft -f
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flush ruleset
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table ip nat {
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chain prerouting {
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type nat hook prerouting priority 0; policy accept;
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}
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# for all packets to WAN, after routing, replace source address with primary IP of WAN interface
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chain postrouting {
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type nat hook postrouting priority 100; policy accept;
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oifname "ppp0" masquerade
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}
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}
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215
rotuer.nix
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rotuer.nix
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# This is not part of Liminix per se. This is my "scratchpad"
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# configuration for the device I'm testing with.
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#
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# Parts of it do do things that Liminix eventually needs to do, but
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# don't look in here for solutions - just for identifying the
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# problems.
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{ config, pkgs, lib, ... } :
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let
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secrets = import ./rotuer-secrets.nix;
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inherit (pkgs.liminix.networking)
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address
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bridge
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dnsmasq
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hostapd
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interface
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pppoe
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route;
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inherit (pkgs.liminix.services) oneshot longrun bundle target;
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inherit (pkgs)
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waitup
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serviceFns
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iptables;
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in rec {
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services.loopback =
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let iface = interface { type = "loopback"; device = "lo";};
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in bundle {
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name = "loopback";
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contents = [
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(address iface { family = "inet4"; address ="127.0.0.1"; prefixLength = 8;})
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(address iface { family = "inet6"; address ="::1"; prefixLength = 128;})
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];
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};
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boot = {
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tftp = {
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enable = true;
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serverip = "10.0.0.1";
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ipaddr = "10.0.0.8";
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};
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};
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imports = [
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./modules/wlan.nix
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./modules/phram.nix
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];
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kernel = {
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config = {
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PPP = "y";
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PPP_BSDCOMP = "y";
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PPP_DEFLATE = "y";
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PPP_ASYNC = "y";
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PPP_SYNC_TTY = "y";
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BRIDGE = "y";
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NETFILTER_XT_MATCH_CONNTRACK = "y";
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IP6_NF_IPTABLES= "y";
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IP_NF_IPTABLES= "y";
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IP_NF_NAT = "y";
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IP_NF_TARGET_MASQUERADE = "y";
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NETFILTER = "y";
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NETFILTER_ADVANCED = "y";
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NETFILTER_XTABLES = "y";
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NFT_COMPAT = "y";
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NFT_CT = "y";
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NFT_LOG = "y";
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NFT_MASQ = "y";
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NFT_NAT = "y";
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NFT_REJECT = "y";
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NFT_REJECT_INET = "y";
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NF_CONNTRACK = "y";
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NF_NAT = "y";
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NF_NAT_MASQUERADE = "y";
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NF_TABLES= "y";
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NF_TABLES_INET = "y";
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NF_TABLES_IPV4 = "y";
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NF_TABLES_IPV6 = "y";
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};
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};
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services.lan =
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let iface = interface {
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type = "bridge";
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device = "lan";
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};
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in address iface {
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family = "inet4"; address ="10.8.0.1"; prefixLength = 16;
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};
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services.wireless = interface {
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type = "hardware";
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device = "wlan0";
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dependencies = [ config.services.wlan_module ];
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};
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services.wired = interface {
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type = "hardware";
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device = "eth0";
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primary = services.lan;
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};
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services.hostap = hostapd (services.wireless) {
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params = {
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ssid = "liminix";
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country_code = "GB";
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hw_mode="g";
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channel = "2";
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wmm_enabled = 1;
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ieee80211n = 1;
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inherit (secrets) wpa_passphrase;
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auth_algs = 1; # 1=wpa2, 2=wep, 3=both
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wpa = 2; # 1=wpa, 2=wpa2, 3=both
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wpa_key_mgmt = "WPA-PSK";
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wpa_pairwise = "TKIP CCMP"; # auth for wpa (may not need this?)
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rsn_pairwise = "CCMP"; # auth for wpa2
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};
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};
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services.bridgewlan =
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let waitup-wlan = longrun {
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name = "waitup-wlan0";
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run = "${waitup}/bin/waitup wlan0 10";
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notification-fd = 10;
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dependencies = [ services.wireless services.hostap ];
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};
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in oneshot {
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name = "add-wlan-to-bridge";
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up = "ip link set dev ${services.wireless.device} master ${services.lan.device}";
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down = "ip link set dev ${services.wireless.device} nomaster";
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dependencies = [ waitup-wlan ];
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};
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users.dnsmasq = {
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uid = 51; gid= 51; gecos = "DNS/DHCP service user";
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dir = "/run/dnsmasq";
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shell = "/bin/false";
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};
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groups.dnsmasq = {
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gid = 51; usernames = ["dnsmasq"];
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};
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groups.system.usernames = ["dnsmasq"];
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services.dns =
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dnsmasq {
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resolvconf = services.resolvconf;
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interface = services.lan;
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ranges = ["10.8.0.10,10.8.0.240"];
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domain = "fake.liminix.org";
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};
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services.wan =
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let iface = interface { type = "hardware"; device = "eth1"; };
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in pppoe iface {
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ppp-options = [
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"debug" "+ipv6" "noauth"
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"name" secrets.l2tp.name
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"password" secrets.l2tp.password
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];
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};
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services.resolvconf = oneshot rec {
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dependencies = [ services.wan ];
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name = "resolvconf";
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up = ''
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. ${serviceFns}
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( cd `mkoutputs ${name}`; umask 0027
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echo "nameserver $(output ${services.wan} ns1)" > resolv.conf
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echo "nameserver $(output ${services.wan} ns2)" >> resolv.conf
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)
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'';
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down = ''
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rm -rf /run/service-state/${name}/
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'';
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};
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services.defaultroute4 = route {
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name = "defaultroute";
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via = "$(output ${services.wan} address)";
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target = "default";
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dependencies = [ services.wan ];
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};
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services.packet_forwarding =
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let filename = "/proc/sys/net/ipv4/conf/all/forwarding";
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in oneshot {
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name = "let-the-ip-flow";
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up = ''
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${pkgs.nftables}/bin/nft -f ${./nat.nft}
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echo 1 > ${filename}
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'';
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down = "echo 0 > ${filename}";
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};
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services.default = target {
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name = "default";
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contents = with services; [
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loopback
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wired
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wireless
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lan
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hostap
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defaultroute4
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packet_forwarding
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dns
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bridgewlan
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resolvconf
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];
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};
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defaultProfile.packages = with pkgs; [ nftables strace tcpdump ] ;
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}
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