netdev - Re: [Patch net 1/3] ipv4: call __ip_options_echo() in cookie_v4

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Date:	Wed, 15 Oct 2014 21:15:45 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Krzysztof Kolasa <kkolasa@...soft.pl>,
	Eric Dumazet <edumazet@...gle.com>,
	Cong Wang <cwang@...pensource.com>
Subject: Re: [Patch net 1/3] ipv4: call __ip_options_echo() in
 cookie_v4_check()

On Wed, 2014-10-15 at 14:33 -0700, Cong Wang wrote:
> From: Cong Wang <cwang@...pensource.com>
> 
> commit 971f10eca186cab238c49da ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
> missed that cookie_v4_check() still calls ip_options_echo() which uses
> IPCB(). It should use TCPCB() at TCP layer, so call __ip_options_echo()
> instead.
> 
> Fixes: commit 971f10eca186cab238c49da ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
> Cc: Krzysztof Kolasa <kkolasa@...soft.pl>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Krzysztof Kolasa <kkolasa@...soft.pl>
> Tested-by: Krzysztof Kolasa <kkolasa@...soft.pl>
> Signed-off-by: Cong Wang <cwang@...pensource.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> ---
>  net/ipv4/syncookies.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
> index 0431a8f..7e7401c 100644
> --- a/net/ipv4/syncookies.c
> +++ b/net/ipv4/syncookies.c
> @@ -321,7 +321,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
>  		int opt_size = sizeof(struct ip_options_rcu) + opt->optlen;
>  
>  		ireq->opt = kmalloc(opt_size, GFP_ATOMIC);
> -		if (ireq->opt != NULL && ip_options_echo(&ireq->opt->opt, skb)) {
> +		if (ireq->opt != NULL && __ip_options_echo(&ireq->opt->opt, skb, opt)) {
>  			kfree(ireq->opt);
>  			ireq->opt = NULL;
>  		}

Signed-off-by: Eric Dumazet <edumazet@...gle.com>


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