Re: unable to install leaked routes with krt_prefsrc set/how to unset an attribute?

[Maria Matejka]

Hello!

unset(krt_prefsrc);

Maria

On 16 May 2023 15:51:07 CEST, jo+bird at swagspace.org wrote:
>Hello.
>
>I am currently trying to get route leaking to work on Linux with bird.
>
>I have several VRFs and want to leak some of the routes from one VRF into an other. For this I have several routing tables in bird, one kernel protocol per table and pipe protocols to leak to routes between the tables. This works as intended.
>However I have a problem when exporting my leaked routes to the kernel.
>
>I get the log message
>
>May 16 15:28:24 host-1 bird[7349]: kernel4: 0.0.0.0/0: reinstalling
>May 16 15:28:24 host-1 bird[7349]: Netlink: Invalid argument
>May 16 15:28:24 host-1 bird[7349]: kernel4: 172.21.0.1/32: reinstalling
>May 16 15:28:24 host-1 bird[7349]: Netlink: Invalid argument
>
>Those 2 routes are not installed into the corresponding kernel routing table. These are exactly the routes that have the Kernel.prefsrc/krt_prefsrc attribute set.
>If I try to install these routes manually with all the attributes they have in the bird routing table I get the error
>
>> root at host-1:~# ip r add table 5 0.0.0.0/0 via 172.21.0.1 dev vlan-uplink-1 metric 1024 src 172.21.0.153
>> Error: Invalid prefsrc address.
>
>This is because the IP address that is used here comes from an other VRF where it is available however it is not available in the VRF I am trying to install it.
>(I also don't need the prefsrc option to where the route is installed.)
>If I add the route to the Linux FIB without the prefsrc value or with an IP address that is available in the corresponding VRF, then it works out as intended.
>A workaround that I found is to set the krt_prefsrc attribute on export to something that is available in the target VRF. However it would be nicer to simply remove the attribute.
>So is it possible to remove an attribute from a route in bird?
>
>Greetings
>Jo
>
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