netdev - Re: [PATCH] ip_gre: CONFIG_IPV6

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Date:	Wed, 29 Sep 2010 16:11:58 +0900
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] ip_gre: CONFIG_IPV6_MODULE support

On Wed, Sep 29, 2010 at 08:24:03AM +0200, Eric Dumazet wrote:
.
> Well, sometimes people wants to :
> 
> /etc/modprobe.conf
> install ipv6 /bin/true
> 
> 
> Yet, be able to load ip_gre as a module
> 
> so IPV6=m, GRE=m,

I think if we cared about this we should provide ways to disable
IPv6 (if there aren't any already) even when the module is loaded
or the code is built-in.

BTW, I think the code isn't 100% safe as is as it tries to access
skb_dst unconditionally in the IPv6 case.  If the packet came via
a remote source (e.g., bridging and virt) it may not have an IPv6
skb_dst at all.

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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