Dear BPF list, I am new to eBPF so go easy on me. It seems to me that currently eBPF has no support for route table lookups including firewall marks. The bpf_fib_lookup structure itself has no mark field as per https://elixir.bootlin.com/linux/v5.10.28/source/include/uapi/linux/bpf.h#L4864 Additionally bpf_fib_lookup() function does not incorporate the firewall mark in its route lookup. It explicitly sets it to 0 as per https://elixir.bootlin.com/linux/v5.10.28/source/net/core/filter.c#L5329 along with other fields which are used during the regular routing policy database lookup. Thus lookups from within eBPF and outside of it result in different outcomes if there are rules directing traffic based on fwmark. Can you please advise what the rationale for this is or if there anything that I might be missing. Let me know if I can provide any further information. Cheers, Rumen Telbizov
