Re: [PATCH bpf v4 4/4] selftest/bpf: Test sockmap redirect for AF_UNIX MSG_OOB

On Sat, Jul 13, 2024 at 09:41 PM +02, Michal Luczaj wrote:

Verify that out-of-band packets are silently dropped before they reach the
redirection logic.

The idea is to test with a 2 byte long send(). Should a MSG_OOB flag be in
use, only the last byte will be treated as out-of-band. Test fails if
verd_mapfd indicates a wrong number of packets processed (e.g. if OOB
wasn't dropped at the source) or if it was possible to recv() MSG_OOB from
the mapped socket, or if any stale OOB data have been left reachable from
the unmapped socket.

Signed-off-by: Michal Luczaj <redacted>
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Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>