398 lines
11 KiB
Nix
398 lines
11 KiB
Nix
# Routing daemon configuration
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{ hostName, config, lib, pkgs, ... }:
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let
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hostNameEscaped = builtins.replaceStrings [ "-" ] [ "_" ] hostName;
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hostConf = config.site.hosts.${hostName};
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upstreamInterfaces = lib.filterAttrs (_: { upstream, ... }:
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upstream != null
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) hostConf.interfaces;
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isUpstream = upstreamInterfaces != {};
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ipv6RouterNets = builtins.attrNames (
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lib.filterAttrs (net: { ipv6Router, ... }:
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ipv6Router == hostName
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) config.site.net
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);
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enumerate = n: list:
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if list == []
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then []
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else [ {
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n = n;
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x = builtins.head list;
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} ] ++ (enumerate (n + 1) (builtins.tail list));
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nets4 =
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hostConf.bgp.nets4
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++
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builtins.concatMap (net:
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if net != "core"
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then
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let
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subnet4 = config.site.net.${net}.subnet4 or null;
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in lib.optional (subnet4 != null) subnet4
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else
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[]
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) (builtins.attrNames hostConf.interfaces);
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nets6 =
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hostConf.bgp.nets6
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++
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builtins.concatMap (net:
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if net != "core"
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then
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builtins.attrValues config.site.net.${net}.subnets6 or {}
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else
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[]
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) (builtins.attrNames hostConf.interfaces);
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upstreamsToOrder = upstreams:
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builtins.foldl' (order: { n, x }:
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order // {
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${x} = n;
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}
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) {} (enumerate 1 upstreams);
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upstream4Order = upstreamsToOrder hostConf.bgp.allowedUpstreams;
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upstream6Order = upstreamsToOrder hostConf.bgp.allowedUpstreams6;
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allowedUpstreams = lib.unique (
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hostConf.bgp.allowedUpstreams ++ hostConf.bgp.allowedUpstreams6
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);
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in
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{
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services.bird2 = {
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enable = true;
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config = ''
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router id ${config.site.net.core.hosts4.${hostName}};
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protocol kernel K4 {
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learn;
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ipv4 {
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export all;
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};
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}
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protocol kernel K6 {
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learn;
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ipv6 {
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export all;
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};
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}
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protocol device {
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scan time 10;
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}
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# Import address ranges of upstream interfaces so that
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# internal traffic to local public services take no detours
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# if the default router takes another upstream gateway.
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protocol direct {
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ipv4 {
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${if isUpstream
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then ''
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# No RFC1918, RFC6598
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import where net !~ [ 100.64.0.0/10 ] && net !~ [ 10.0.0.0/8 ] && net !~ [ 172.16.0.0/12 ] && net !~ [ 192.168.0.0/16 ];
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''
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else ""}
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};
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ipv6;
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interface ${lib.concatMapStringsSep ", " (iface:
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''"${iface}"''
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)(builtins.attrNames hostConf.interfaces)};
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check link yes;
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}
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${lib.optionalString (hostConf.bgp.upstreamTable != null) ''
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# BIRD routing table for Wireguard transport
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ipv4 table vpn_table;
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# Kernel routing table for Wireguard transport
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protocol kernel VPN {
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# "vpn_table" configured on anon routers
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kernel table 100;
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ipv4 {
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export all;
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table vpn_table;
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};
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}
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''}
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${lib.optionalString (ipv6RouterNets != []) ''
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# Router advertisements
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protocol radv {
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rdnss ${config.site.net.serv.hosts6.dn42.dnscache};
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${lib.concatMapStrings (net: ''
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interface "${net}" {
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min ra interval 10;
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max ra interval 60;
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solicited ra unicast yes;
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${builtins.concatStringsSep "\n" (
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map (subnet6: ''
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prefix ${subnet6} {
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preferred lifetime 600;
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valid lifetime 1800;
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};
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'') (builtins.attrValues config.site.net.${net}.subnets6)
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)}
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dnssl "${config.site.net.${net}.domainName}";
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};
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'') ipv6RouterNets}
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}
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''}
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# Zentralwerk DN42
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protocol static {
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ipv4;
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route 172.20.72.0/21 unreachable;
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}
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protocol static {
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ipv6;
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route fd23:42:c3d2:580::/57 unreachable;
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route 2a00:8180:2c00:200::/56 unreachable;
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route 2a0f:5382:acab:1400::/56 unreachable;
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}
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${lib.optionalString (hostConf.bgp != null) ''
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# zentralwerk-network
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template bgp bgp_rr_server {
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local as ${toString hostConf.bgp.asn};
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direct;
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ipv4 {
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import filter {
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preference = preference + 200;
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accept;
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};
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export filter {
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if net ~ [ ${config.site.net.core.subnet4} ] then {
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reject;
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}
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${lib.optionalString (nets4 != []) ''
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if net ~ [ ${lib.concatMapStringsSep ", " (n: "${n}+") nets4} ] then {
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accept;
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}
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''}
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reject;
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};
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};
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ipv6 {
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import filter {
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preference = preference + 200;
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accept;
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};
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export filter {
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if net ~ [ ${lib.concatStringsSep ", " (builtins.attrValues config.site.net.core.subnets6)} ] then {
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reject;
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}
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${lib.optionalString (nets6 != []) ''
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if net ~ [ ${lib.concatMapStringsSep ", " (n: "${n}+") nets6} ] then {
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accept;
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}
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''}
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reject;
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};
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};
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}
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template bgp bgp_rr_client {
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local as ${toString hostConf.bgp.asn};
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direct;
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connect delay time 1;
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connect retry time 3;
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error wait time 1 5;
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error forget time 5;
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ipv4 {
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next hop self on;
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import filter {
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preference = preference + 200;
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accept;
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};
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${lib.optionalString (nets4 != []) ''
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export where net ~ [ ${lib.concatMapStringsSep ", " (n: "${n}") nets4} ];
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''}
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};
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ipv6 {
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next hop self on;
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import filter {
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preference = preference + 200;
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accept;
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};
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${lib.optionalString (nets6 != []) ''
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export where net ~ [ ${lib.concatMapStringsSep ", " (n: "${n}") nets6} ];
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''}
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};
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}
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# dn42
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template bgp bgp_external {
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local as ${toString hostConf.bgp.asn};
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direct;
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ipv4 {
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next hop self on;
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import all;
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export where source = RTS_STATIC;
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};
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ipv6 {
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next hop self on;
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import all;
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export where source = RTS_STATIC;
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};
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}
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# emitting default routes
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template bgp bgp_upstream {
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local as ${toString hostConf.bgp.asn};
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direct;
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ipv4 {
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next hop self on;
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import all;
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export where net = 0.0.0.0/0;
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};
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ipv6 {
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next hop self on;
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import all;
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export where net = ::/0;
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};
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}
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${lib.concatMapStrings (peer:
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let
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peerConf = hostConf.bgp.peers.${peer};
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isRange = lib.hasInfix "/" peer;
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in ''
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protocol bgp bgp_${peerConf.name} from bgp_${peerConf.type} {
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neighbor ${lib.optionalString isRange "range"} ${peer} as ${toString peerConf.asn};
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${lib.optionalString isRange ''
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dynamic name "bgp_${peerConf.name}";
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''}
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${lib.optionalString (peerConf.type == "rr") ''
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rr client;
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''}
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}
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'') (builtins.attrNames hostConf.bgp.peers)}
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${lib.concatMapStrings ({ n, x }: let upstream = x; in ''
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# upstream client instance #${toString n}
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protocol bgp bgp_up_${builtins.replaceStrings ["-"] ["_"] upstream} {
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local as ${toString hostConf.bgp.asn};
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neighbor ${config.site.net.core.hosts6.dn42.${upstream}} as ${toString hostConf.bgp.asn};
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direct;
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connect delay time 1;
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connect retry time 3;
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error wait time 1 5;
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error forget time 5;
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ipv4 {
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${if (upstream4Order ? ${upstream})
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then ''
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import filter {
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preference = preference + ${toString (100 - upstream4Order.${upstream})};
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accept;
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};
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''
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else ''
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import none;
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''}
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${lib.optionalString (nets4 != []) ''
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export where net ~ [ ${lib.concatMapStringsSep ", " (n: "${n}") nets4} ];
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''}
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${lib.optionalString (hostConf.bgp.upstreamTable != null) ''
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table ${hostConf.bgp.upstreamTable};
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''}
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};
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ipv6 {
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${if (upstream4Order ? ${upstream})
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then ''
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import filter {
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preference = preference + ${toString (100 - upstream4Order.${upstream})};
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accept;
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};
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''
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else ''
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import none;
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''}
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${lib.optionalString (nets6 != []) ''
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export where net ~ [ ${lib.concatMapStringsSep ", " (n: "${n}") nets6} ];
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''}
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};
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}
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'') (enumerate 1 allowedUpstreams)}
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''}
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'';
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};
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# Script that pings internet hosts every few minutes to determine if
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# the upstream actually works. The associated OSPF instance will be
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# enabled/disabled on state change.
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systemd.services =
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let
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interval = 5;
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targets = {
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ipv4 = [
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# inbert.c3d2.de
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"217.197.83.184"
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# ccc.de
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"195.54.164.39"
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# Cloud DNS services
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"9.9.9.9"
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"8.8.8.8"
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"1.1.1.1"
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];
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ipv6 = [
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# inbert.c3d2.de
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"2001:67c:1400:2240::1"
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# ccc.de
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"2001:67c:20a0:2:0:164:0:39"
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# Cloud DNS services
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"2620:fe::9"
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"2606:4700:4700::1111"
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"2001:4860:4860::8888"
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];
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};
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instance = {
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ipv4 = "bgp_up";
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};
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checkService = addressFamily: {
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description = "Check connectivity for ${addressFamily}";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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User = "bird2";
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Group = "bird2";
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};
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path = [ pkgs.bird2 "/run/wrappers" ];
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script = ''
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STATE=unknown
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while true; do
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NEW_STATE=unknown
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false \
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${lib.concatMapStrings (target:
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" || ping -n -s 0 -c 1 -w 1 ${target} 2>/dev/null >/dev/null \\\n"
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) targets.${addressFamily}} \
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&& NEW_STATE=up \
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|| NEW_STATE=down
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if [ $STATE != $NEW_STATE ]; then
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echo "Connectivity change from $STATE to $NEW_STATE"
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if [ $NEW_STATE = up ]; then
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birdc enable ${instance.${addressFamily}}
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else
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birdc disable ${instance.${addressFamily}}
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fi
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fi
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STATE=$NEW_STATE
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sleep ${toString interval}
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done
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'';
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};
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in lib.mkIf isUpstream {
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check-upstream-ipv4 = checkService "ipv4";
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#check-upstream-ipv6 = checkService "ipv6";
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};
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}
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