[dev] More complex PBR rules

Hi FRR developers, I am new to this group and wonder if you can advise how I could implement more complex PBR rules to achieve for example load balancing. The requirement I have is to route based on e.g. a hash like: hash(src-ip+dst-ip) mod N routes via gwX 0<X<=N ( load balance over N gateways ) This would help in situations where I can not use a MAC for identifying a GW ( e.g. in cloud environments) . Would this be possible with FRR or do I have to look into the linux kernel. If it is in the kernel, could someone point me to the relevant kernel routines ? Thank you Markus