netdev - Re: [PKT_SCHED]: Add stateless NAT

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Message-ID: <20070927124515.GA16706@gondor.apana.org.au>
Date:	Thu, 27 Sep 2007 20:45:15 +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 04:41:21PM +0400, Evgeniy Polyakov wrote:
>
> I've attached simple patch which moves checksum helpers out of
> CONFIG_NETFILTER option but still in the same linux/netfilter.h header.
> This should be enough for removing 'select NETFILTER' in your patch.

Close but no cigar :)

> diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
> index 1dd075e..6c3fb10 100644
> --- a/include/linux/netfilter.h
> +++ b/include/linux/netfilter.h
> @@ -40,6 +40,29 @@
>  #endif
>  
>  #ifdef __KERNEL__
> +
> +static inline void nf_csum_replace4(__sum16 *sum, __be32 from, __be32 to)
> +{
> +	__be32 diff[] = { ~from, to };
> +
> +	*sum = csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum_unfold(*sum)));
> +}
> +
> +static inline void nf_csum_replace2(__sum16 *sum, __be16 from, __be16 to)
> +{
> +	nf_csum_replace4(sum, (__force __be32)from, (__force __be32)to);
> +}
> +
> +extern void nf_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
> +				      __be32 from, __be32 to, int pseudohdr);

This function won't exist if NETFILTER is off.

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