netdev - Re: [PATCH net v2] vti: fix spd lookup: match plaintext pkt, not ipsec pkt

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Date:	Tue, 05 Nov 2013 09:01:43 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christophe Gouault <christophe.gouault@...nd.com>
Cc:	Steffen Klassert <steffen.klassert@...unet.com>,
	"David S. Miller" <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	netdev@...r.kernel.org, Saurabh Mohan <saurabh.mohan@...tta.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH net v2] vti: fix spd lookup: match plaintext pkt, not
 ipsec pkt

On Tue, 2013-11-05 at 16:58 +0100, Christophe Gouault wrote:

> diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
> index 6e87f85..bcd85be 100644
> --- a/net/ipv4/ip_vti.c
> +++ b/net/ipv4/ip_vti.c
> @@ -126,6 +126,7 @@ static int vti_rcv(struct sk_buff *skb)
>  	if (tunnel != NULL) {
>  		struct pcpu_tstats *tstats;
>  		u32 oldmark = skb->mark;
> +		u16 netoff = skb_network_header(skb) - skb->data;

		unsigned int nhoff = skb_network_offset(skb);

There is no need to assume u16 here, even if the implementation
currently has this assumption.

You also could just use faster operation (no need to access
skb->data/head)

	unsigned int old_nh = skb->network_header;

...
at restore, use :
	skb->network_header = old_nh;

instead of the more expensive skb_set_network_header()



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