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

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Message-ID: <1452878324.1223.188.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 15 Jan 2016 09:18:44 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	David Miller <davem@...emloft.net>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH net] netfilter: xt_TCPMSS: handle CHECKSUM_COMPLETE in
 tcpmss_tg6()

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 ?