netdev - Re: [PATCH v2 net-next 1/3] ip: discard IPv4 datagrams with overlapping segments.

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Date:   Thu, 2 Aug 2018 17:09:35 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Peter Oskolkov <posk@...gle.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Westphal <fw@...len.de>
Subject: Re: [PATCH v2 net-next 1/3] ip: discard IPv4 datagrams with
 overlapping segments.

On Thu,  2 Aug 2018 23:34:37 +0000
Peter Oskolkov <posk@...gle.com> wrote:

> This behavior is required in IPv6, and there is little need
> to tolerate overlapping fragments in IPv4. This change
> simplifies the code and eliminates potential DDoS attack vectors.
> 
> Tested: ran ip_defrag selftest (not yet available uptream).
> 
> Suggested-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Peter Oskolkov <posk@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Florian Westphal <fw@...len.de>

There are a couple of relevant RFC's

RFC 1858 - Security Considerations for IP Fragment Filtering
RFC 2460 - Handling of Overlapping IPv6 Fragments

Acked-by: Stephen Hemminger <stephen@...workplumber.org>