a992ca2a04
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. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Patrick McHardy <kaber@trash.net>
35 lines
933 B
C
35 lines
933 B
C
#ifndef __NETNS_CONNTRACK_H
|
|
#define __NETNS_CONNTRACK_H
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/list_nulls.h>
|
|
#include <asm/atomic.h>
|
|
|
|
struct ctl_table_header;
|
|
struct nf_conntrack_ecache;
|
|
|
|
struct netns_ct {
|
|
atomic_t count;
|
|
unsigned int expect_count;
|
|
unsigned int htable_size;
|
|
struct kmem_cache *nf_conntrack_cachep;
|
|
struct hlist_nulls_head *hash;
|
|
struct hlist_head *expect_hash;
|
|
struct hlist_nulls_head unconfirmed;
|
|
struct hlist_nulls_head dying;
|
|
struct ip_conntrack_stat __percpu *stat;
|
|
int sysctl_events;
|
|
unsigned int sysctl_events_retry_timeout;
|
|
int sysctl_acct;
|
|
int sysctl_tstamp;
|
|
int sysctl_checksum;
|
|
unsigned int sysctl_log_invalid; /* Log invalid packets */
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table_header *sysctl_header;
|
|
struct ctl_table_header *acct_sysctl_header;
|
|
struct ctl_table_header *tstamp_sysctl_header;
|
|
struct ctl_table_header *event_sysctl_header;
|
|
#endif
|
|
char *slabname;
|
|
};
|
|
#endif
|