linux-kernel - Re: [PATCH net] ipv6: Prevent ipv6_find_hdr() from returning ENOENT for valid non-first fragments

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Date:	Fri, 9 Jan 2015 01:05:46 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Rahul Sharma <rsharma@...sta.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net] ipv6: Prevent ipv6_find_hdr() from returning ENOENT
 for valid non-first fragments

On Thu, Jan 08, 2015 at 11:39:16PM +0100, Hannes Frederic Sowa wrote:
> Hi Pablo,
> 
> On Thu, Jan 8, 2015, at 21:53, Pablo Neira Ayuso wrote:
> > I'm afraid we cannot just get rid of that !ipv6_ext_hdr() check. The
> > ipv6_find_hdr() function is designed to return the transport protocol.
> > After the proposed change, it will return extension header numbers.
> > This will break existing ip6tables rulesets since the `-p' option
> > relies on this function to match the transport protocol.
> >
> > Note that the AH header is skipped (see code a bit below this
> > problematic fragmentation handling) so the follow up header after the
> > AH header is returned as the transport header.
> > 
> > We can probably return the AH protocol number for non-1st fragments.
> > However, that would be something new to ip6tables since nobody has
> > ever seen packet matching `-p ah' rules. Thus, we restore control to
> > the user to allow this, but we would accept all kind of fragmented AH
> > traffic through the firewall since we cannot know what transport
> > protocol contains from non-1st fragments (unless I'm missing anything,
> > I need to have a closer look at this again tomorrow with fresher
> > mind).
> 
> The code in question is guarded by (_frag_off != 0), so we are
> definitely processing a non-1st fragment currently. The -p match would
> happen at the time when the packet is reassembled and thus ipv6_find_hdr
> will find the real transport (final) header at this point (I hope I
> followed the code correctly here).

Then, Rahul should get things working by modprobing nf_defrag_ipv6.
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