linux-kernel - Re: [PATCH] ip6_gre: simplify gre header parsing in ip6gre

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Date:   Tue, 11 Sep 2018 08:47:46 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     Haishuang Yan <yanhaishuang@...s.chinamobile.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ip6_gre: simplify gre header parsing in ip6gre_err

On Tue, 11 Sep 2018 10:19:31 +0800, Haishuang Yan wrote:
> Since csum_err may not be used outside, how about refactoring gre_parse_header function like this:
> 
> --- a/net/ipv4/gre_demux.c
> +++ b/net/ipv4/gre_demux.c
> @@ -86,7 +86,7 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
> 
>         options = (__be32 *)(greh + 1);
>         if (greh->flags & GRE_CSUM) {
> -               if (skb_checksum_simple_validate(skb)) {
> +               if (csum_err && skb_checksum_simple_validate(skb)) {

Something like this, yes.

Thanks!

 Jiri