xfrm: Increment statistic counter on inner mode error

Increment the LINUX_MIB_XFRMINSTATEMODEERROR statistic counter
to notify about dropped packets if we fail to fetch a inner mode.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 60ce701..ad7f5b3 100644 (file)
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -330,8 +330,10 @@ resume:
 
                if (x->sel.family == AF_UNSPEC) {
                        inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
-                       if (inner_mode == NULL)
+                       if (inner_mode == NULL) {
+                               XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
                                goto drop;
+                       }
                }
 
                if (inner_mode->input(x, skb)) {