netdev - Re: multicast: bug or "feature"

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Message-ID: <471915FC.1000604@hp.com>
Date:	Fri, 19 Oct 2007 16:39:24 -0400
From:	Brian Haley <brian.haley@...com>
To:	David Stevens <dlstevens@...ibm.com>
Cc:	Vlad Yasevich <vladislav.yasevich@...com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: multicast: bug or "feature"

Hi David,

David Stevens wrote:
>         From looking at the code, it appears that validate
> source is failing just because of the rp_filter. Do you have
> rp_filter set to nonzero?
>         If so, it may do what you want just by setting that
> to 0:
> 
> sysctl -w net.ipv4.conf.all.rp_filter=0

rp_filter is set to zero, it's the "if (res.type != RTN_UNICAST)" check 
in fib_validate_source() that's doing it.  If I add a new 
"accept_local_addr" sysctl to ipv4_devconf to allow RTN_LOCAL here, 
everything works just fine.  I just don't know how palatable that would 
be to upstream...

-Brian
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