From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick McHardy Subject: Re: [PATCH] netfilter: nf_conntrack_tstamp: add flow-based timestamp extension Date: Wed, 19 Jan 2011 16:01:17 +0100 Message-ID: <4D36FCBD.3040808@trash.net> References: <20110118192724.3438.41304.stgit@decadence> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Cc: netfilter-devel@vger.kernel.org To: Pablo Neira Ayuso Return-path: Received: from stinky.trash.net ([213.144.137.162]:46763 "EHLO stinky.trash.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754099Ab1ASPBW (ORCPT ); Wed, 19 Jan 2011 10:01:22 -0500 In-Reply-To: <20110118192724.3438.41304.stgit@decadence> Sender: netfilter-devel-owner@vger.kernel.org List-ID: On 18.01.2011 20:27, Pablo Neira Ayuso wrote: > This patch adds flow-based timestamping for conntracks. This > conntrack extension is disabled by default. Basically, we use > two 64-bits variables to store the creation timestamp once the > conntrack has been confirmed and the other to store the deletion > time. This extension is disabled by default, to enable it, you > have to: > > echo 1 > /proc/sys/net/netfilter/nf_conntrack_timestamp > > This patch allows to save memory for user-space flow-based > loogers such as ulogd2. In short, ulogd2 does not need to > keep a hashtable with the conntrack in user-space to know > when they were created and destroyed, instead we use the > kernel timestamp. If we want to have a sane IPFIX implementation > in user-space, this nanosecs resolution timestamps are also > useful. Other custom user-space applications can benefit from > this via libnetfilter_conntrack. > > This patch modifies the /proc output to display the delta time > in seconds since the flow start. You can also obtain the > flow-start date by means of the conntrack-tools. Applied, thanks Pablo.