Subject: Re: [PATCH net-next v5 2/8] netfilter: Factor out nf_ct_get_info().

From: Sergei Shtylyov <[email-masked]>
Date: Thu, 17 Dec 2015 16:31:24 +0300

Hello.

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

> Define a new inline function to map conntrack status to enum
> ip_conntrack_info.  This removes the need to otherwise duplicate this
> code in a later patch ("openvswitch: Find existing conntrack entry
> after upcall.").
>
> Signed-off-by: Jarno Rajahalme <[email-masked]>
[...]
> diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
> index 3cb3cb8..7546fc7 100644
> --- a/net/netfilter/nf_conntrack_core.c
> +++ b/net/netfilter/nf_conntrack_core.c
> @@ -1056,25 +1056,15 @@ resolve_normal_ct(struct net *net, struct nf_conn *tmpl,
>   	ct = nf_ct_tuplehash_to_ctrack(h);
>
>   	/* It exists; we have (non-exclusive) reference. */
> -	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) {
> -		*ctinfo = IP_CT_ESTABLISHED_REPLY;
> -		/* Please set reply bit if this packet OK */
> -		*set_reply = 1;
> -	} else {
> -		/* Once we've had two way comms, always ESTABLISHED. */
> -		if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
> -			pr_debug("nf_conntrack_in: normal packet for %p\n", ct);
> -			*ctinfo = IP_CT_ESTABLISHED;
> -		} else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) {
> -			pr_debug("nf_conntrack_in: related packet for %p\n",
> -				 ct);
> -			*ctinfo = IP_CT_RELATED;
> -		} else {
> -			pr_debug("nf_conntrack_in: new packet for %p\n", ct);
> -			*ctinfo = IP_CT_NEW;
> -		}
> -		*set_reply = 0;
> -	}
> +	*ctinfo = nf_ct_get_info(h);
> +	if (*ctinfo == IP_CT_ESTABLISHED)
> +		pr_debug("nf_conntrack_in: normal packet for %p\n", ct);
> +	else if (*ctinfo == IP_CT_RELATED)
> +		pr_debug("nf_conntrack_in: related packet for %p\n", ct);
> +	else if (*ctinfo == IP_CT_NEW)
> +		pr_debug("nf_conntrack_in: new packet for %p\n", ct);

    This is asking to be a *switch* statement...

[...]

MBR, Sergei