This patch adds a sysctl to read out the number of current connections.
ip_conntrack_count is an atomic_t, but it is read out by proc_dointvec.
I have checked all arches, all use an int, but I'm not sure if it works
on all of them.


ChangeSet@1.1935.1.2, 2004-09-18 23:27:31+02:00, laforge@netfilter.org
  [NETFILTER]: add sysctl to read out the number of current connections
 
  Apparently a lot of scripts use a construct like
          "cat /proc/net/ip_conntrack | wc -l"
  which has a negative impact on system performance due to all the locking
  required.
 
  Signed-off-by: Harald Welte <laforge@netfilter.org>
  Signed-off-by: Patrick McHardy <kaber@trash.net>