# {{ ansible_managed }}

include "/etc/bird/clear_defines.conf";
include "/etc/bird/clear_functions.conf";

define CLEARNET_PREFIP = {{ uvok_bird_opts.preferred_ip }};

# trs=transit
ipv6 table t_myas_unfiltered;
ipv6 table t_myas_trs;
ipv6 table t_myas_babel;

roa6 table clear_roa_v6;

protocol rpki roa_clearnet1 {
    roa6 { table clear_roa_v6; };
    remote 10.2.0.1;
    port 8282;
    refresh 3600;
    retry 600;
    expire 7200;
}

protocol rpki roa_clearnet2 {
    roa6 { table clear_roa_v6; };
    remote 10.2.0.12;
    port 8282;
    refresh 3600;
    retry 600;
    expire 7200;
}

define BOGON_ASNS = [
  0,                      # RFC 7607
  23456,                  # RFC 4893 AS_TRANS
  64496..64511,           # RFC 5398 and documentation/example ASNs
  64512..65534,           # RFC 6996 Private ASNs
  65535,                  # RFC 7300 Last 16 bit ASN
  65536..65551,           # RFC 5398 and documentation/example ASNs
  65552..131071,          # RFC IANA reserved ASNs
  4200000000..4294967294, # RFC 6996 Private ASNs
  4294967295 ];           # RFC 7300 Last 32 bit ASN

define BOGON_PREFIXES = [ ::/0,                          # Default route
                          ::/8+,                         # RFC 4291 IPv4-compatible, loopback, et al
                          0100::/64+,                    # RFC 6666 Discard-Only
                          2001:2::/48+,                  # RFC 5180 BMWG
                          2001:10::/28+,                 # RFC 4843 ORCHID
                          2001:db8::/32+,                # RFC 3849 documentation
                          2002::/16+,                    # RFC 7526 6to4 anycast relay
                          3ffe::/16+,                    # RFC 3701 old 6bone
                          fc00::/7+,                     # RFC 4193 unique local unicast
                          fe80::/10+,                    # RFC 4291 link local unicast
                          fec0::/10+,                    # RFC 3879 old site local unicast
                          ff00::/8+                      # RFC 4291 multicast
 ];

function reject_bogon_asns()
int set bogon_asns;
{
  bogon_asns = BOGON_ASNS;

  if ( bgp_path ~ bogon_asns ) then {
    print "Reject: bogon AS_PATH: ", net, " ", bgp_path;
    clearnet_add_filter(FILTER_BOGON_ASN);
  }
}

function reject_bogon_prefixes()
prefix set bogon_prefixes;
{
    bogon_prefixes = BOGON_PREFIXES;
    if (net ~ bogon_prefixes) then {
        print "Reject: Bogon prefix: ", net, " ", bgp_path;
        clearnet_add_filter(FILTER_BOGON_PREFIX);
    }
}

define PROBLEM_PREFIXES = [
];

function reject_problem_prefixes()
prefix set problem_prefixes;
{
    problem_prefixes = PROBLEM_PREFIXES;
    if (net ~ problem_prefixes) then {
        print "Reject: Problematic prefix: ", net, " ", bgp_path;
        clearnet_add_filter(FILTER_PROBLEM_PREFIX);
    }
}

function reject_long_aspaths()
{
    if ( bgp_path.len > 50 ) then {
        clearnet_add_filter(FILTER_LONG_ASPATH);
    }
}

function reject_small_prefixes()
{
  if (net.len > 55 && net.type = NET_IP6) then {
    print "Reject: Too small prefix: ", net, " ", bgp_path;
    clearnet_add_filter(FILTER_SMALL_V6_PREFIX);
  }
}

function reject_roa_rpki()
{
    if ( roa_check(clear_roa_v6, net, bgp_path.last_nonaggregated) = ROA_INVALID ) then {
        clearnet_add_filter(FILTER_ROA_RPKI);
    }
}

function prefer_direct_neighbor()
{
    if (bgp_path.len = 1) then
        bgp_local_pref = bgp_local_pref + 700;
}


function clearnet_common_import() {
    reject_bogon_asns();
    reject_bogon_prefixes();
    reject_long_aspaths();
    reject_small_prefixes();
    reject_problem_prefixes();
    reject_roa_rpki();
    prefer_direct_neighbor();
    honor_graceful_shutdown();
}

filter myas_export
{
    if (proto = "myprefix") then {
        accept;
    }
    reject;
}

# route collector
filter myas_f_rc
{
# export IXP routes after all
#    if ( clearnet_is_ixp() ) then reject;
    if (source = RTS_BGP) then accept;
    if (proto = "myprefix") then accept;
    reject;
};

protocol static myprefix {
{% for prefix in uvok_bird_opts.clear_prefixes %}
    route {{ prefix }} reject;
{% endfor %};

    ipv6 {
        # needs to be in unfiltered - because that's where I'm exporting from
        table t_myas_unfiltered;
        import all;
        export none;
    };
}

protocol direct {
    ipv6 { table t_myas_babel; };
    interface "myas_int";
};

template bgp pt_clearnet {
    local as CLEARNET_ASN;

    graceful restart on;
    long lived graceful restart on;

    prefer older on;

    # Neighbor as must be first route as
    enforce first as on;
    # faster updates
    enable extended messages on;

    # defaults anyway
    enable route refresh on;
    interpret communities on;
    direct;

    # higher better
    default bgp_local_pref 100;

    # my value - lower better
    default bgp_med 100;

    ipv6 {
        # start by importing into the unfiltered table
        table t_myas_unfiltered;

        # for inspection who's evil
        import keep filtered;
        # for RPKI / ROA
        import table on;

        import filter {
            clearnet_import_transit();
            clearnet_common_import();
            accept;
        };

        export filter myas_export;
    };
}

# route collector
template bgp pt_rc from pt_clearnet {
    multihop;

    # yes, use unfiltered table for export
    ipv6 {
        add paths tx;
        import none;
        export filter myas_f_rc;
    };
}

{% if uvok_bird_opts.babel_if_name %}
protocol babel p_myas_babel {
  ipv6 {
    table t_myas_babel;
    import where source ~ [RTS_DEVICE, RTS_BABEL];
    export where source ~ [RTS_DEVICE, RTS_BABEL];
  };

  interface "{{ uvok_bird_opts.babel_if_name }}" {
  };
}
{% endif %}

# pipe babel table => bgp table for next-hop resolution?
protocol pipe {
    table t_myas_babel;
    peer table t_myas_trs;
    import none;
    export where source ~ [RTS_BABEL];
}

# EXPORT FROM unfilteed TO filtered trs table
protocol pipe {
    table t_myas_unfiltered;
    peer table t_myas_trs;
    import none;
    export filter {
        if ( bgp_large_community ~ [(CLEARNET_ASN, LC_FILTERED, *)] ) then {
            reject;
        }
        accept;
    };
}

protocol kernel p_myas_i {
#    scan time 20;
    kernel table 150;

    ipv6 {
        table t_myas_babel;
        import none;
        export filter {
            if (source != RTS_BABEL) then {
                print "SHOULD NOT HAPPEN: export babel to kernel: ", net, " from", source;
                reject;
            }
            krt_prefsrc = CLEARNET_PREFIP;
            accept;
        };
    };
};

protocol kernel pk_myas_out {
    kernel table 100;

    ipv6 {
        table t_myas_trs;
        import none;
        export filter {
            krt_prefsrc = CLEARNET_PREFIP;
            if (source = RTS_BGP) then {
                accept;
            }
{% if uvok_bird_opts.use_fallback %}
            if (proto = "myas_def_fallb") then {
                accept;
            }
{% endif %}
            reject;
        };
    };
};

include "/etc/bird/clear_peers/*.conf";
{% if uvok_bird_opts.use_fallback %}
include "clear_fallback.conf";
{% endif %}