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Enforce that TCP Fast Open is controlled by LANDLOCK_ACCESS_NET_CONNECT_TCP. Semantics of connect() and sendmsg(MSG_FASTOPEN) should be identical from Landlock's perspective. Also enforce error code consistency, since UDP sockets ignore the MSG_FASTOPEN flag while Unix sockets reject it. Signed-off-by: Matthieu Buffet <matthieu@buffet.re> Link: https://patch.msgid.link/20260701214628.33319-2-matthieu@buffet.re Cc: stable@vger.kernel.org [mic: Fix formatting] Signed-off-by: Mickaël Salaün <mic@digikod.net>