netdev - Re: [PATCH net-next v4 2/8] netfilter: Factor out nf_ct_get

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Message-ID: <20151210191441.GA20536@salvia>
Date:	Thu, 10 Dec 2015 20:14:41 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Jarno Rajahalme <jarno@....org>
Cc:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	dev@...nvswitch.org
Subject: Re: [PATCH net-next v4 2/8] netfilter: Factor out nf_ct_get_info().

On Tue, Dec 08, 2015 at 05:01:04PM -0800, 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 <jarno@....org>
> ---
>  include/net/netfilter/nf_conntrack.h | 15 +++++++++++++++
>  net/netfilter/nf_conntrack_core.c    | 22 +++-------------------
>  2 files changed, 18 insertions(+), 19 deletions(-)
> 
> diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
> index fde4068..b3de10e 100644
> --- a/include/net/netfilter/nf_conntrack.h
> +++ b/include/net/netfilter/nf_conntrack.h
> @@ -125,6 +125,21 @@ nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
>  			    tuplehash[hash->tuple.dst.dir]);
>  }
>  
> +static inline enum ip_conntrack_info
> +nf_ct_get_info(const struct nf_conntrack_tuple_hash *h)
> +{
> +	const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
> +
> +	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
> +		return IP_CT_ESTABLISHED_REPLY;
> +	/* Once we've had two way comms, always ESTABLISHED. */
> +	if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
> +		return IP_CT_ESTABLISHED;
> +	if (test_bit(IPS_EXPECTED_BIT, &ct->status))
> +		return IP_CT_RELATED;
> +	return IP_CT_NEW;
> +}
> +
>  static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
>  {
>  	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
> diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
> index 3cb3cb8..70ddbd8 100644
> --- a/net/netfilter/nf_conntrack_core.c
> +++ b/net/netfilter/nf_conntrack_core.c
> @@ -1056,25 +1056,9 @@ 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);

This implicitly assumes we don't want pr_debug for nf_conntrack
anymore. Not telling this is wrong, but we have more pr_debug() calls
in nf_conntrack that will remain there.
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