[DCCP]: Increment sequence numbers on retransmitted Response packets

[~andy/linux] / net / dccp / output.c

diff --git a/net/dccp/output.c b/net/dccp/output.c
index 992caedd772545016be413bf4835c985f264d144..08ee5547a2f21259a520a1f7ba9443eb08d77b0f 100644 (file)
--- 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;
 }