netdev - Re: follow-up: discrepancy with POSIX

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Message-ID: <20070919183004.GA18707@one.firstfloor.org>
Date:	Wed, 19 Sep 2007 20:30:04 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>, netdev <netdev@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: follow-up: discrepancy with POSIX

On Wed, Sep 19, 2007 at 11:02:00AM -0700, Ulrich Drepper wrote:
> > on UDP/RAW and it's certainly possible to connect() to that. 
> 
> Where do you get this from?  And where is this implemented?  I don't

Sorry it's actually loopback, not broadcast as implemented in Linux.
In Linux it's implemented in ip_route_output_slow(). Essentially
converted to 127.0.0.1

I think it's traditional BSD behaviour but couldn't find it on
a quick look in FreeBSD source (but haven't looked very intensively) 

Admittedly port 0 is somewhat dodgy for UDP too, but at least in RAW
context it might be valid.

-Andi
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