netdev - Re: [PKT_SCHED]: Add stateless NAT

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Date:	Thu, 27 Sep 2007 21:20:37 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	jamal <hadi@...erus.ca>
Subject: Re: [PKT_SCHED]: Add stateless NAT

On Thu, Sep 27, 2007 at 05:10:08PM +0400, Evgeniy Polyakov wrote:
>
> +static inline void nf_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
> +			    __be32 from, __be32 to, int pseudohdr)
> +{
> +	__be32 diff[] = { ~from, to };
> +	if (skb->ip_summed != CHECKSUM_PARTIAL) {
> +		*sum = csum_fold(csum_partial(diff, sizeof(diff),
> +				~csum_unfold(*sum)));
> +		if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
> +			skb->csum = ~csum_partial(diff, sizeof(diff),
> +						~skb->csum);
> +	} else if (pseudohdr)
> +		*sum = ~csum_fold(csum_partial(diff, sizeof(diff),
> +				csum_unfold(*sum)));
> +}

The embedded people are going to hate you for this :)

How about putting it in net/core/utils.c?

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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