[NETFILTER]: Use only 32bit counters for CONNTRACK_ACCT

Initially we used 64bit counters for conntrack-based accounting, since we
had no event mechanism to tell userspace that our counters are about to
overflow.  With nfnetlink_conntrack, we now have such a event mechanism and
thus can save 16bytes per connection.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 10 insertions, 4 deletions

diff --git a/include/linux/netfilter/nfnetlink_conntrack.h b/include/linux/netfilter/nfnetlink_conntrack.h
index fb5511030185..116fcaced909 100644
--- a/include/linux/netfilter/nfnetlink_conntrack.h
+++ b/include/linux/netfilter/nfnetlink_conntrack.h
@@ -84,8 +84,10 @@ enum ctattr_protoinfo_tcp {
 
 enum ctattr_counters {
         CTA_COUNTERS_UNSPEC,
-        CTA_COUNTERS_PACKETS,
-        CTA_COUNTERS_BYTES,
+        CTA_COUNTERS_PACKETS,           /* old 64bit counters */
+        CTA_COUNTERS_BYTES,             /* old 64bit counters */
+        CTA_COUNTERS32_PACKETS,
+        CTA_COUNTERS32_BYTES,
         __CTA_COUNTERS_MAX
 };
 #define CTA_COUNTERS_MAX (__CTA_COUNTERS_MAX - 1)
diff --git a/include/linux/netfilter_ipv4/ip_conntrack.h b/include/linux/netfilter_ipv4/ip_conntrack.h
index 4ced38736813..d078bb91d9e5 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack.h
@@ -117,6 +117,10 @@ enum ip_conntrack_events
         /* NAT info */
         IPCT_NATINFO_BIT = 10,
         IPCT_NATINFO = (1 << IPCT_NATINFO_BIT),
+
+        /* Counter highest bit has been set */
+        IPCT_COUNTER_FILLING_BIT = 11,
+        IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT),
 };
 
 enum ip_conntrack_expect_events {
@@ -192,8 +196,8 @@ do {									\
 
 struct ip_conntrack_counter
 {
-        u_int64_t packets;
-        u_int64_t bytes;
+        u_int32_t packets;
+        u_int32_t bytes;
 };
 
 struct ip_conntrack_helper;