netdev - Re: [PATCH net-next v5 7/8] openvswitch: Delay conntrack helper call for new connections.

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Message-ID: <5672B99A.7080404@cogentembedded.com>
Date:	Thu, 17 Dec 2015 16:33:14 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Jarno Rajahalme <jarno@....org>, netdev@...r.kernel.org
Cc:	netfilter-devel@...r.kernel.org, dev@...nvswitch.org
Subject: Re: [PATCH net-next v5 7/8] openvswitch: Delay conntrack helper call
 for new connections.

Hello.

On 12/17/2015 3:36 AM, Jarno Rajahalme wrote:

> There is no need to help connections that are not confirmed, so we can
> delay helping new connections to the time when they are confirmed.
> This change is needed for NAT support, and having this as a separate
> patch will make the following NAT patch a bit easier to review.
>
> Signed-off-by: Jarno Rajahalme <jarno@....org>
> ---
>   net/openvswitch/conntrack.c | 20 +++++++++++++++-----
>   1 file changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
> index 7aa38fa..ba44287 100644
> --- a/net/openvswitch/conntrack.c
> +++ b/net/openvswitch/conntrack.c
[...]
> @@ -491,11 +496,16 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
>   			return -ENOENT;
>
>   		ovs_ct_update_key(skb, key, true);
> +	}
>
> -		if (ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
> -			WARN_ONCE(1, "helper rejected packet");
> -			return -EINVAL;
> -		}
> +	/* Call the helper right after nf_conntrack_in() for confirmed
> +	 * connections, but only when commiting for unconfirmed connections.
> +	 */
> +	ct = nf_ct_get(skb, &ctinfo);
> +	if (ct && (nf_ct_is_confirmed(ct) ? !cached : info->commit)
> +	    && ovs_ct_helper(skb, info->family) != NF_ACCEPT) {

    Please leave && on the line being broken, don't carry it into the 
continuation line.

MBR, Sergei

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