[IPSEC]: Sync series - core changes

This patch provides the core functionality needed for sync events
for ipsec. Derived work of Krisztian KOVACS <hidden@balabit.hu>

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 6e8880e..b686548 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -261,6 +261,8 @@
 	NET_CORE_DEV_WEIGHT=17,
 	NET_CORE_SOMAXCONN=18,
 	NET_CORE_BUDGET=19,
+	NET_CORE_AEVENT_ETIME=20,
+	NET_CORE_AEVENT_RSEQTH=21,
 };
 
 /* /proc/sys/net/ethernet */