netdev - Re: [PATCH net] netfilter: xt_TCPMSS: handle CHECKSUM_COMPLETE in tcpmss

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Message-ID: <20160115200416.GA2331@salvia>
Date:	Fri, 15 Jan 2016 21:04:16 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, tom@...bertland.com, kaber@...sh.net,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	herbert@...dor.apana.org.au
Subject: Re: [PATCH net] netfilter: xt_TCPMSS: handle CHECKSUM_COMPLETE in
 tcpmss_tg6()

On Fri, Jan 15, 2016 at 02:04:49PM -0500, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Fri, 15 Jan 2016 09:18:44 -0800
> 
> > On Fri, 2016-01-15 at 08:43 -0800, Tom Herbert wrote:
> > 
> >> Probably should have a utility function do this. Maybe something like
> >> update_hdr_field(skb, old, new)? Could return new value so above could
> >> just be:
> >> 
> >> ipv6h->payload_len = update_hdr_field(skb, ipv6h->payload_len,
> >> htons(ntohs(oldlen) + ret);
> > 
> > Well, oldlen would still need to be ipv6h->payload_len
> > 
> > Not sure a helper will be nice for a stable submission.
> > 
> > Probably better for net-next ?
> 
> Agreed.  We already have those csum_replace{2,4}() helpers in net/checksum.h
> which we could augment with ones that can handle length changes too.

I'm going to place this into the nf tree, thanks!