[XFRM]: Export SAD info.

On a system with a lot of SAs, counting SAD entries chews useful
CPU time since you need to dump the whole SAD to user space;
i.e something like ip xfrm state ls | grep -i src | wc -l
I have seen taking literally minutes on a 40K SAs when the system
is swapping.
With this patch, some of the SAD info (that was already being tracked)
is exposed to user space. i.e you do:
ip xfrm state count
And you get the count; you can also pass -s to the command line and
get the hash info.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 0 deletions

diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index 15ca89e9961b..9c656a5cf842 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -181,6 +181,10 @@ enum {
         XFRM_MSG_MIGRATE,
 #define XFRM_MSG_MIGRATE XFRM_MSG_MIGRATE
 
+        XFRM_MSG_NEWSADINFO,
+#define XFRM_MSG_NEWSADINFO XFRM_MSG_NEWSADINFO
+        XFRM_MSG_GETSADINFO,
+#define XFRM_MSG_GETSADINFO XFRM_MSG_GETSADINFO
         __XFRM_MSG_MAX
 };
 #define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
@@ -234,6 +238,17 @@ enum xfrm_ae_ftype_t {
 #define XFRM_AE_MAX (__XFRM_AE_MAX - 1)
 };
 
+/* SAD Table filter flags  */
+enum xfrm_sad_ftype_t {
+        XFRM_SAD_UNSPEC,
+        XFRM_SAD_HMASK=1,
+        XFRM_SAD_HMAX=2,
+        XFRM_SAD_CNT=4,
+        __XFRM_SAD_MAX
+
+#define XFRM_SAD_MAX (__XFRM_SAD_MAX - 1)
+};
+
 struct xfrm_userpolicy_type {
         __u8            type;
         __u16           reserved1;
@@ -265,6 +280,16 @@ enum xfrm_attr_type_t {
 #define XFRMA_MAX (__XFRMA_MAX - 1)
 };
 
+enum xfrm_sadattr_type_t {
+        XFRMA_SAD_UNSPEC,
+        XFRMA_SADHMASK,
+        XFRMA_SADHMAX,
+        XFRMA_SADCNT,
+        __XFRMA_SAD_MAX
+
+#define XFRMA_SAD_MAX (__XFRMA_SAD_MAX - 1)
+};
+
 struct xfrm_usersa_info {
         struct xfrm_selector            sel;
         struct xfrm_id                  id;