netdev - Re: [PATCH net] flow_dissector: do not dissect l4 ports for fragments

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Date:   Fri, 09 Nov 2018 20:02:26 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        soukjin.bae@...sung.com
Subject: Re: [PATCH net] flow_dissector: do not dissect l4 ports for
 fragments

From: Eric Dumazet <edumazet@...gle.com>
Date: Fri,  9 Nov 2018 16:53:06 -0800

> From: 배석진 <soukjin.bae@...sung.com>
> 
> Only first fragment has the sport/dport information,
> not the following ones.
> 
> If we want consistent hash for all fragments, we need to
> ignore ports even for first fragment.
> 
> This bug is visible for IPv6 traffic, if incoming fragments
> do not have a flow label, since skb_get_hash() will give
> different results for first fragment and following ones.
> 
> It is also visible if any routing rule wants dissection
> and sport or dport.
> 
> See commit 5e5d6fed3741 ("ipv6: route: dissect flow
> in input path if fib rules need it") for details.
> 
> [edumazet] rewrote the changelog completely.
> 
> Fixes: 06635a35d13d ("flow_dissect: use programable dissector in skb_flow_dissect and friends")
> Signed-off-by: 배석진 <soukjin.bae@...sung.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable.