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Matthieu Baerts (NGI0)andGreg Kroah-Hartman ec7b6a0424 selftests: mptcp: pm: ensure unknown flags are ignored

commit 29f4801e9c upstream.

This validates the previous commit: the userspace can set unknown flags
-- the 7th bit is currently unused -- without errors, but only the
supported ones are printed in the endpoints dumps.

The 'Fixes' tag here below is the same as the one from the previous
commit: this patch here is not fixing anything wrong in the selftests,
but it validates the previous fix for an issue introduced by this commit
ID.

Fixes: 01cacb00b3 ("mptcp: add netlink-based PM")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20251205-net-mptcp-misc-fixes-6-19-rc1-v1-2-9e4781a6c1b8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
[ Conflicts in pm_netlink.sh, because some refactoring have been done
  later on: commit 0d16ed0c2e ("selftests: mptcp: add
  {get,format}_endpoint(s) helpers") and commit c99d57d000
  ("selftests: mptcp: use pm_nl endpoint ops") are not in this version.
  The same operation can still be done at the same place, without using
  the new helpers.
  Also, commit 1dc88d241f ("selftests: mptcp: pm_nl_ctl: always look
  for errors") is not in this version, and create a conflict in the
  context which is not related to the modification here.
  Conflicts in pm_nl_ctl.c, because commit 69c6ce7b6e ("selftests:
  mptcp: add implicit endpoint test case") is not in this version, and
  caused a conflict in the context which is not related to the
  modification here. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>