netdev - Re: [PATCH 06/18] netfilter: add protocol independant NAT core

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Date:	Thu, 23 Aug 2012 00:48:19 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 06/18] netfilter: add protocol independant NAT core


On Thursday 2012-08-23 00:13, Patrick McHardy wrote:
>>> +	iph = (void *)skb->data + iphdroff;
>>
>> Is trying to avoid some GNU extensions a worthwhile goal? If so,
>> iph = (struct iphdr *)(skb->data + iphdroff) should be used, like in:
>
> I don't get your point.

You are doing arithmetic with a void* pointer, which is a GNU extension.
Should we try to limit "unnecessary excess usage" of GNU features?
You could do arithmetic with the char* that skb->data is:

 iph = (void *)(skb->data + iphdroff);

or, if more clarity is desired, the more verbose form

 iph = (struct iphdr *)(skb->data + iphdroff);

Does this seem like something worthwhile to passively pursue?
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