Unknown instruction 8574 in same (~) error when nesting if's

20 Apr 2019

      Hello,

I am using bird 1.6.3 (from debian) and if I use the following filter,
bird "crashes" when issueing the "conf" command:

Apr 19 21:29:53 router1 bird: Reconfiguring
Apr 19 21:29:53 router1 bird: Unknown instruction 8574 in same (~)

filter:

filter to_netstream {
  if(is_inside_ungleich()) then {
      if(net !~ net_prefer_netstream) then {
        bgp_path.prepend(myas);
        bgp_path.prepend(myas);
        bgp_path.prepend(myas);
        print "Policy: changed bgppath ", net, " ", bgp_path, " for init7";
      }
    accept;
  }

  reject;
}

If I change the filter to

filter to_netstream {
  if(is_inside_ungleich()) then {
    # if(net !~ net_prefer_netstream) then {
    #   bgp_path.prepend(myas);
    #   bgp_path.prepend(myas);
    #   bgp_path.prepend(myas);
    #   print "Policy: changed bgppath ", net, " ", bgp_path, " for init7";
    # }
    accept;
  }

  reject;
}

this problem does not occur.

Is this a bug in bird or am I using it "incorrectly"?

Best,

Nico

Relevant context:

version:
--------------------------------------------------------------------------------

[17:14:30] router1.place5:/var/log# dpkg -l | grep bird
ii  bird                                   1.6.3-2                            amd64        Internet Routing Daemon
[17:18:49] router1.place5:/var/log#

config:
--------------------------------------------------------------------------------
define net_ungleich = [ 2a0a:e5c0::/29+,  2a09:2940::/29+ ];

define net_prefer_netstream = [ 2a09:2940::/29+ ];

define net_rickbakker = [
                          2001:678:a10::/48+,
                          2a0d:1a44::/32+,
                          2a0d:1a47::/32+,
                          2a0d:2406::/39+,
                          2a0d:2406:e00::/39+,
                          2a07:a904:1000::/40+
                        ];

function is_ungleich()
{
  if net ~ net_ungleich then return true;
  return false;
}

function is_from_rickbakker()
{
  if net ~ net_rickbakker && bgp_path.first = 204526 then return true;
  return false;
}

# what we have inside dcl
function is_inside_ungleich()
{
  if(is_ungleich()) then return true;
  if(is_from_rickbakker()) then return true;

  return false;
}

protocol bgp netstream {
	local as 209898;
	neighbor 2a01:330:1000:1002::1 as 15517;
	password "xxx";

	import filter from_netstream;
    export filter to_netstream;
}

--------------------------------------------------------------------------------

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Unknown instruction 8574 in same (~) error when nesting if's

Nico Schottelius