[XFRM]: Define packet dropping statistics.

This statistics is shown factor dropped by transformation
at /proc/net/xfrm_stat for developer.
It is a counter designed from current transformation source code
and defined as linux private MIB.

See Documentation/networking/xfrm_proc.txt for the detail.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 521cb6e12561..32ddb7b12e7f 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -27,11 +27,19 @@
 #include <net/dst.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
+#ifdef CONFIG_XFRM_STATISTICS
+#include <net/snmp.h>
+#endif
 
 #include "xfrm_hash.h"
 
 int sysctl_xfrm_larval_drop __read_mostly;
 
+#ifdef CONFIG_XFRM_STATISTICS
+DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly;
+EXPORT_SYMBOL(xfrm_statistics);
+#endif
+
 DEFINE_MUTEX(xfrm_cfg_mutex);
 EXPORT_SYMBOL(xfrm_cfg_mutex);
 
@@ -2258,6 +2266,16 @@ static struct notifier_block xfrm_dev_notifier = {
         0
 };
 
+#ifdef CONFIG_XFRM_STATISTICS
+static int __init xfrm_statistics_init(void)
+{
+        if (snmp_mib_init((void **)xfrm_statistics,
+                          sizeof(struct linux_xfrm_mib)) < 0)
+                return -ENOMEM;
+        return 0;
+}
+#endif
+
 static void __init xfrm_policy_init(void)
 {
         unsigned int hmask, sz;
@@ -2294,9 +2312,15 @@ static void __init xfrm_policy_init(void)
 
 void __init xfrm_init(void)
 {
+#ifdef CONFIG_XFRM_STATISTICS
+        xfrm_statistics_init();
+#endif
         xfrm_state_init();
         xfrm_policy_init();
         xfrm_input_init();
+#ifdef CONFIG_XFRM_STATISTICS
+        xfrm_proc_init();
+#endif
 }
 
 #ifdef CONFIG_AUDITSYSCALL