netdev - Re: [PATCH -next 1/3] ipv4: reject too-big defragmented DF-skb when forwarding

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Message-Id: <1428706280.2052307.251919509.22467B5C@webmail.messagingengine.com>
Date:	Sat, 11 Apr 2015 00:51:20 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Florian Westphal <fw@...len.de>, netdev@...r.kernel.org
Cc:	kaber@...sh.net
Subject: Re: [PATCH -next 1/3] ipv4: reject too-big defragmented DF-skb when
 forwarding

On Sat, Apr 11, 2015, at 00:16, Florian Westphal wrote:
> Send icmp pmtu error if we find that the largest fragment of df-skb
> exceeded the output path mtu.
> 
> The ip output path will still catch this later on but we can avoid the
> forward/postrouting hook traversal by rejecting right away.
> 
> This is what ipv6 already does.
> 
> Signed-off-by: Florian Westphal <fw@...len.de>

Also,
Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

I think this is the right thing to do not create pmtu blackholes

Bye,
Hannes
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