https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217637

--- Comment #72 from Michael Tuexen <tue...@freebsd.org> ---
(In reply to slw from comment #71)
I'm not arguing the semantic of the TCP level ACKs.

I'm saying that if a TCP stack knows that some user data can not be delivered
to its application, it should signal that to the peer.

This includes:
* receiving data after the socket was closed or shutdown(..., SHUT_RD) was
called.
* closing the socket or calling shutdown(..., SHUT_RD) with user data still in
the
  receive buffer.

I think:
* these four cases should be handled the same way.
* Resetting the TCP connection is what I would expect.

I can write some packetdrill test scripts to see what the current behaviour is
under FreeBSD (and Linux).

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