netdev - Re: ip_tunnel: Remove gratuitous skb scrubbing

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Message-ID: <20150415102229.GA3917@gondor.apana.org.au>
Date:	Wed, 15 Apr 2015 18:22:29 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	netdev@...r.kernel.org, "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: ip_tunnel: Remove gratuitous skb scrubbing

On Wed, Apr 15, 2015 at 12:20:42PM +0200, Nicolas Dichtel wrote:
> Le 15/04/2015 12:01, Herbert Xu a écrit :
> >The commit ea23192e8e577dfc51e0f4fc5ca113af334edff9 ("tunnels:
> >harmonize cleanup done on skb on rx path") broke anyone trying to
> >use netfilter marking across IPv4 tunnels.  As the commit message
> >did not give any justification for this (in fact it shouldn't
> >even be touching the tx path), I can only assume that it was a typo.
> If I remember well, this was discussed on netdev (CC Eric). The goal of this
> patch was, like the title said, to hamonize packets processing in tunnels.
> I'm not against to keep the mark, but I think patching skb_scrub_packet is
> better. With your patch, ip6tnl, gre6, etc. still drops the mark. And at the
> end, it's not consistant.
> 
> What about something like this:

Yes this is better.  I'm currently auditing all the other bits
that are cleared to see if there is anything else that we should
preserve for tunneling.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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