puppet-ff_gw/templates/etc/bird/bird.conf.erb

table ibgp; # internal BGP peerings
table ebgp; # external (icvpn) BGP peerings
table freifunk; # kernel table 42 for routing from ff network

define ownas = <%= @ff_as %>;

router id <%= @own_ipv4 %>;

### functions ###

# own network
function is_self_net() {
    return (net ~ [<%= @ff_net %>+]);
}

# freifunk ip ranges in general
function is_freifunk() {
  return net ~ [ 10.0.0.0/8+,
    104.0.0.0/8+
  ];
}

# dn42 ip ranges
function is_dn42() {
  return net ~ [ 172.22.0.0/15+,
    195.160.168.0/23+,
    91.204.4.0/22+,
    193.43.220.0/23+,
    87.106.29.254/32,
    85.25.246.16/28+,
    46.4.248.192/27+,
    94.45.224.0/19+,
    195.191.196.0/23+,
    80.244.241.224/27+,
    46.19.90.48/28+,
    46.19.90.96/28+,
    178.63.170.40/32,
    188.40.34.241/32,
    195.16.84.40/29+,
    37.1.89.160/29+,
    178.33.32.123/32+,
    37.1.89.160/29+,
    185.28.77.16/29+,
    185.28.77.192/27+,
    192.175.48.0/24+
  ];
}

# chaosvpn ranges
function is_chaos() {
  return net ~ [ 10.4.0.0/16+,
    10.32.0.0/16+,
    10.42.16.0/20+, # legacy
    10.100.0.0/14+,
    10.104.0.0/14+,
    172.31.0.0/16+,
    83.133.178.0/23+,
    172.26.0.0/15+,
    176.9.52.58/32+,
    193.103.159.0/24+,
    193.103.160.0/23+,
    212.12.50.208/29+,
    213.238.61.128/26+
  ];
}

### kernel ###

# synchronize from bird to main kernel routing table
# nothing in the other direction
protocol kernel k_mast {
    scan time 10;
    import none;
    export filter {
        krt_prefsrc = <%= @own_ipv4 %>;
        accept;
    };
};

# synchronize from birds freifunk table to kernel routing table 42
# nothing in the other direction
protocol kernel k_frei {
    scan time 10;
    table freifunk;
    kernel table 42;
    import none;
    export filter {
        krt_prefsrc = <%= @own_ipv4 %>;
        accept;
    };
};

# this pseudo-protocol watches all interface up/down events
protocol device {
    scan time 10;
};

### pipes ###

# sync nothing from main routing table to ebgp
# sync routes (not own network) from ebgp to main routing table
protocol pipe p_maintbl {
    peer table ebgp;
    import where !is_self_net();
    export none;
};

# sync routes (not own network) from ebgp to ibgp
# sync routes (all) from ibgp to ebgp
protocol pipe p_ibgptbl {
  table ebgp;
  peer table ibgp;
  import all;
  export where !is_self_net();
};

# sync routes (freifunk, dn42 and chaosvpn) from ibgp to freifunk
# sync nothing from freifunk to ibgp
protocol pipe p_freitbl {
  table ibgp;
  peer table freifunk;
  import none;
  export where (is_freifunk() || is_dn42() || is_chaos());
};

### static routes ###

# if no openvpn is running, reject everything we do not have a route for
protocol static unreachable_default {
  route 0.0.0.0/0 reject;
  table freifunk;
};

protocol static static_ffhh {  
  route <%= @ff_net %> reject;
  table ebgp;
};

# in hamburg we use a /18 from our /16 in the mesh
# create a route for that in freifunk table
protocol static local_ffhh {
  route <%= @ff_mesh_net %> via "br-ffhh";
  table freifunk;
};

### templates ###

# template for same city freifunk gateways
template bgp locals {
  table ibgp;
  local as ownas;
  import filter {
    preference = 99;
    accept;
  };
  export where source = RTS_BGP;
  direct;
  next hop self;
};

# template for icvpn gateways of other cities
template bgp peers {
  table ebgp;
  local as ownas;
  # ignore routes for our own network
  import where ((is_freifunk() || is_dn42()) && !is_chaos() && !is_self_net());
  export where ((is_freifunk() || is_dn42()) && !is_chaos());
  route limit 10000;
};

### local gateways ###

<% @peerings_v4.each_pair do |key, hash| -%><% if hash["ip"] != @own_ipv4 -%>
protocol bgp <%= key %> from <%= hash["template"] %> {
  neighbor <%= hash["ip"] %> as ownas;
};
<% end -%><% end -%>

### icvpn peerings ###

<% if @gw_do_ic_peering -%>
<% @ic_peerings_v4.each_pair do |key, hash| -%><% if hash["ip"] != @own_ipv4 -%>
protocol bgp <%= key %> from <%= hash["template"] %> {
  neighbor <%= hash["ip"] %> as <%= hash["as"] %>;
};
<% end -%><% end -%>
<% end -%>