xfrm: update SA curlft.use_time

SA use_time was only updated once, for the first packet.
with this fix update the use_time for every packet.
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/xfrm/xfrm_input.c

@@ -669,6 +669,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 
 		x->curlft.bytes += skb->len;
 		x->curlft.packets++;
+		x->curlft.use_time = ktime_get_real_seconds();
 
 		spin_unlock(&x->lock);
 

net/xfrm/xfrm_output.c

@@ -533,6 +533,7 @@ static int xfrm_output_one(struct sk_buff *skb, int err)
 
 		x->curlft.bytes += skb->len;
 		x->curlft.packets++;
+		x->curlft.use_time = ktime_get_real_seconds();
 
 		spin_unlock_bh(&x->lock);