On Mon, Mar 09, 2020 at 06:09:49PM -0700, David Miller wrote:

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

quoted

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) <redacted>
Signed-off-by: Xin Long <lucien.xin@gmail.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.

Please drop it. As you noticed, we do need more discussions around
it. Thanks.