Re: [PATCH net-next v6 1/4] net: af_unix: enable custom setsockopt for all socket types

Kuniyuki Iwashima <[email protected]> Tue, 4 Aug 2026 09:49:52 -0700

Newsgroups	gmane.linux.network,gmane.linux.file-systems,gmane.linux.kernel
Message-ID	<CAAVpQUAW4eTfvNGaY+9gD06Jct6tgM3LRYdLEVFG+VzhCFYojw@mail.gmail.com>

On Sun, Aug 2, 2026 at 8:11=E2=80=AFAM Jori Koolstra <[email protected]> =
wrote:
>
> unix_setsockopt() and the SOCK_CUSTOM_SOCKOPT flag were only wired up
> for SOCK_STREAM (introduced along with the stream-only SO_INQ).
> Consequently custom AF_UNIX options are unreachable on SOCK_DGRAM and
> SOCK_SEQPACKET: those setsockopt() calls bypass unix_setsockopt() and
> fall through to the generic sock_setsockopt(), failing with
> -ENOPROTOOPT.
>
> Set SOCK_CUSTOM_SOCKOPT for every AF_UNIX socket type in unix_create(), a=
nd
> also for accepted sockets in unix_accept() (reachable for stream and
> seqpacket).
>
> This is a prerequisite for making SO_RIGHTS_NOTRUNC settable on all AF_UN=
IX
> socket types.
>
> Signed-off-by: Jori Koolstra <[email protected]>

Reviewed-by: Kuniyuki Iwashima <[email protected]>