[XFRM]: Export SPD info

With this patch you can use iproute2 in user space to efficiently see
how many policies exist in different directions.

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

1 files changed, 15 insertions, 1 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 762926009c04..dbf9d96a2f0b 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -579,8 +579,22 @@ static inline int xfrm_byidx_should_resize(int total)
         return 0;
 }
 
-static DEFINE_MUTEX(hash_resize_mutex);
+void xfrm_spd_getinfo(struct xfrm_spdinfo *si)
+{
+        read_lock_bh(&xfrm_policy_lock);
+        si->incnt = xfrm_policy_count[XFRM_POLICY_IN];
+        si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT];
+        si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD];
+        si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
+        si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
+        si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
+        si->spdhcnt = xfrm_idx_hmask;
+        si->spdhmcnt = xfrm_policy_hashmax;
+        read_unlock_bh(&xfrm_policy_lock);
+}
+EXPORT_SYMBOL(xfrm_spd_getinfo);
 
+static DEFINE_MUTEX(hash_resize_mutex);
 static void xfrm_hash_resize(struct work_struct *__unused)
 {
         int dir, total;