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From: John Baldwin <jhb@freebsd.org>
To: Alexander Leidinger <Alexander@leidinger.net>
Subject: Re: [PATCH] Properly handle Linux TCP socket options
Date: Tue, 22 Jan 2013 12:14:15 -0500
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On Monday, January 21, 2013 2:55:22 pm Alexander Leidinger wrote:
> On Sat, 19 Jan 2013 11:26:13 -0500 John Baldwin <jhb@freebsd.org> wrote:
> 
> > The current setsockopt() wrapper for the Linux ABI claims that Linux
> > and FreeBSD use the same values for TCP socket options.  This is true
> > for TCP_NODELAY and TCP_MAXSEG but not for any other options.  This
> > patch adds a mapping routine for TCP options similar to that used for
> > other socket option levels.  I believe this mapping to be correct in
> > terms of which FreeBSD options have the same semantics as Linux
> > options based on comparing code in the two kernels, but I'm not 100%
> > certain about TCP_MD5SIG since the Linux code that it maps to is not
> > as clear (it calls some function pointer and it is not clear if it is
> > accepting a simple boolean value similar to FreeBSD's).
> 
> What about a message for unknown options?

We do not do that now for any options (socket level or otherwise).  You could 
easily add that in linux_setsockopt(), but that should be a separate commit.

-- 
John Baldwin