netdev - Re: [PATCH net] sctp: return a one-to-one type socket when doing peeloff

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Message-Id: <20200309.180949.633904935953558472.davem@davemloft.net>
Date:   Mon, 09 Mar 2020 18:09:49 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com,
        jere.leppanen@...ia.com, michael.tuexen@...chi.franken.de
Subject: Re: [PATCH net] sctp: return a one-to-one type socket when doing
 peeloff

From: Xin Long <lucien.xin@...il.com>
Date: Mon,  2 Mar 2020 14:57:15 +0800

> As it says in rfc6458#section-9.2:
> 
>   The application uses the sctp_peeloff() call to branch off an
>   association into a separate socket.  (Note that the semantics are
>   somewhat changed from the traditional one-to-one style accept()
>   call.)  Note also that the new socket is a one-to-one style socket.
>   Thus, it will be confined to operations allowed for a one-to-one
>   style socket.
> 
> Prior to this patch, sctp_peeloff() returned a one-to-many type socket,
> on which some operations are not allowed, like shutdown, as Jere
> reported.
> 
> This patch is to change it to return a one-to-one type socket instead.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Reported-by: Leppanen, Jere (Nokia - FI/Espoo) <jere.leppanen@...ia.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

I don't know what to do with this patch.

There seems to be some discussion about a potential alternative approach
to the fix, but there were problems with that suggestion.

Please advise, thank you.