The function return true but it could not be export

[Alexander Zubkov]

Hi,

I can guess that when you export to BGP, it prepends your AS before
the filter, so your check for "bgp_path.len = 0" turns false.

On Sun, Jun 6, 2021 at 5:31 AM 智慧雨泽 <zhihuiyuze at gmail.com> wrote:
>
> Hi,The function i wrote correctly returns net.
>
> bird> show route 2602:feda:ab2::/48 where bgp_export_all()
> Table master6:
> 2602:feda:ab2::/48   unicast [LL_IX 02:19:31.236] * (100) [i]
>        via 2602:feda:ab2::1 on ll-ix
>
> But it could be export.
> bird> show route export TOHU_IX for 2602:feda:ab2::/48
> bird>
>
> I think that should be accept
> export filter {
> if bgp_export_all() then accept;
> # if (roa_check(r6, net, bgp_path.last_nonaggregated) ~ [ROA_INVALID, ROA_UNKNOWN]) then reject;
> # if is_bogon_asn() then reject;
> # if is_bogon_prefix() then reject;
> # accept;
> };
> };
> }
> Why is it not exported?
> The full configuration is.
>
> protocol bgp TOHU_IX {
> local as LOCAL_ASN;
> description "tohu ix IX-VPS BGP";
> direct;
> source address 2602:feda:ab5::1;
> neighbor 2602:feda:ab6::1%'tuhu-ix' as 141011;
> ipv6 {
> next hop self;
> import filter {
> if is_bogon_asn() then reject;
> if is_bogon_prefix() then reject;
> if (roa_check(r6, net, bgp_path.last_nonaggregated) = ROA_VALID) then reject;
> accept;
> };
> export filter {
> if bgp_export_all() then accept;
> # if (roa_check(r6, net, bgp_path.last_nonaggregated) ~ [ROA_INVALID, ROA_UNKNOWN]) then reject;
> # if is_bogon_asn() then reject;
> # if is_bogon_prefix() then reject;
> # accept;
> };
> };
> }
>
>
> function bgp_export() {
> if net !~ OUR_PREFIXES then return false;
> if is_bogon_asn() then return false;
> if is_bogon_prefix() then return false;
> if net_len_too_long() then {
> # print "net ", net, " prefix too long";
> return false;
> }
> if proto = "BGP_Prefix" then return true;
> if proto = "LL_IX" then{
> if bgp_path.len = 0 then{
> return true;
> }
> }
> if proto = "TOHU_IX" then{
> if bgp_path.len = 0 then{
> return true;
> }
> }
> return false;
> }
>
>
> function bgp_export_all() {
> if bgp_export() then {
> return true;
> }
>
> if source != RTS_BGP then{
> return false;
> }
> if is_bogon_asn() then return false;
> if is_bogon_prefix() then return false;
> return true;
> }
>
>
>
>
>
>