netdev - Re: PATCH: Multicast: Filter multicast traffic per socket mc

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Message-Id: <20090416.151537.184847548.davem@davemloft.net>
Date:	Thu, 16 Apr 2009 15:15:37 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	cl@...ux.com
Cc:	dlstevens@...ibm.com, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org, nhorman@...driver.com,
	vladislav.yasevich@...com
Subject: Re: PATCH: Multicast: Filter multicast traffic per socket mc_list

From: Christoph Lameter <cl@...ux.com>
Date: Thu, 16 Apr 2009 11:36:10 -0400 (EDT)

> On Thu, 16 Apr 2009, David Stevens wrote:
> 
>> This isn't what I suggested-- you have the default backwards. It must
>> default
>> to current behavior, or it's pointless.
> 
> If it would default to the current behavior then it would be incompatible
> with the behavior of other operating systems and the surprising behavior
> of the Linux multicast stack would continue to exist. The unusual behavior
> needs to be switched on if wanted for legacy or other reasons.

Umm, no.

We don't break existing applications "by default".

You're being entirely selfish here, you want your application to work
without having to specify the socket option to get the new behavior.

Well guess what?  Under Linux you will have to!
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