selftests/landlock: Add tests for UDP send

Add tests specific to UDP sendmsg() in the protocol_* variants to ensure
behaviour is consistent across AF_INET, AF_INET6 and AF_UNIX.

Signed-off-by: Matthieu Buffet <matthieu@buffet.re>
Link: https://patch.msgid.link/20260611162107.49278-5-matthieu@buffet.re
[mic: Fix comment formatting, rebase]
Signed-off-by: Mickaël Salaün <mic@digikod.net>
This commit is contained in:
Matthieu Buffet 2026-06-11 18:21:04 +02:00 • committed by Mickaël Salaün
commit cf393de90f
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