netdev - Re: [PATCH v2 net] gre: fix error handler

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Message-Id: <20160615.221533.906327416634459889.davem@davemloft.net>
Date:	Wed, 15 Jun 2016 22:15:33 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	jbenc@...hat.com, netdev@...r.kernel.org, tom@...bertland.com,
	maze@...gle.com
Subject: Re: [PATCH v2 net] gre: fix error handler

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 15 Jun 2016 06:24:00 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> 1) gre_parse_header() can be called from gre_err()
> 
>    At this point transport header points to ICMP header, not the inner
> header.
> 
> 2) We can not really change transport header as ipgre_err() will later
> assume transport header still points to ICMP header (using icmp_hdr())
> 
> 3) pskb_may_pull() logic in gre_parse_header() really works
>   if we are interested at zone pointed by skb->data
> 
> 4) As Jiri explained in commit b7f8fe251e46 ("gre: do not pull header in
> ICMP error processing") we should not pull headers in error handler.
> 
> So this fix :
> 
> A) changes gre_parse_header() to use skb->data instead of
> skb_transport_header()
> 
> B) Adds a nhs parameter to gre_parse_header() so that we can skip the
> not pulled IP header from error path.
>   This offset is 0 for normal receive path.
> 
> C) remove obsolete IPV6 includes
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks Eric.