1 files changed, 4 insertions, 0 deletions

diff --git a/net/dccp/output.c b/net/dccp/output.c
index 992caedd7725..08ee5547a2f2 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -332,6 +332,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
         skb->dst = dst_clone(dst);
 
         dreq = dccp_rsk(req);
+        if (inet_rsk(req)->acked)       /* increase ISS upon retransmission */
+                dccp_inc_seqno(&dreq->dreq_iss);
         DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
         DCCP_SKB_CB(skb)->dccpd_seq  = dreq->dreq_iss;
 
@@ -354,6 +356,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
 
         dccp_csum_outgoing(skb);
 
+        /* We use `acked' to remember that a Response was already sent. */
+        inet_rsk(req)->acked = 1;
         DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
         return skb;
 }