xfrm: Don't queue retransmitted packets if the original is still on the host

It does not make sense to queue retransmitted packets if the
original packet is still in some queue of this host. So add
a check to xdst_queue_output() and drop the packet if the
original packet is not yet sent.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Eric Dumazet <edumazet@google.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index ed38d5d81f9e..e09edfcf1b79 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1832,6 +1832,13 @@ static int xdst_queue_output(struct sk_buff *skb)
         struct dst_entry *dst = skb_dst(skb);
         struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
         struct xfrm_policy_queue *pq = &xdst->pols[0]->polq;
+        const struct sk_buff *fclone = skb + 1;
+
+        if (unlikely(skb->fclone == SKB_FCLONE_ORIG &&
+                     fclone->fclone == SKB_FCLONE_CLONE)) {
+                kfree_skb(skb);
+                return 0;
+        }
 
         if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
                 kfree_skb(skb);