On 2025-12-01 06:44, Vincent Bernat wrote:

When using eBPF, there are two possible cases depending on the program
type. Only the first case was described. In the second case, the program
should not return an index, but a decision (SK_PASS/SK_DROP). The socket
should be selected using the sk_select_reuseport helper.

I didn't add a "Fix:", as this is an update (introduced in Linux 4.19). 
This is not 100% complete as it does not explain socket migration 
(https://docs.ebpf.io/linux/program-type/BPF_PROG_TYPE_SK_REUSEPORT/) 
but I didn't want to go too much in details.