sctp: Restore 'resent' bit to avoid retransmitted chunks for RTT measurements

Currently retransmitted DATA chunks could also be used for
RTT measurements since there are no flag to identify whether
the transmitted DATA chunk is a new one or a retransmitted one.
This problem is introduced by commit ae19c5486 ("sctp: remove
'resent' bit from the chunk") which inappropriately removed the
'resent' bit completely, instead of doing this, we should set
the resent bit only for the retransmitted DATA chunks.

Signed-off-by: Xufeng Zhang <xufeng.zhang@windriver.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 5 insertions, 1 deletions

diff --git a/net/sctp/output.c b/net/sctp/output.c
index e650978daf27..0e2644d0a773 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -474,10 +474,11 @@ int sctp_packet_transmit(struct sctp_packet *packet)
                          * for a given destination transport address.
                          */
 
-                        if (!tp->rto_pending) {
+                        if (!chunk->resent && !tp->rto_pending) {
                                 chunk->rtt_in_progress = 1;
                                 tp->rto_pending = 1;
                         }
+
                         has_data = 1;
                 }
 
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index abb6db008df1..f51ba985a36e 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -446,6 +446,8 @@ void sctp_retransmit_mark(struct sctp_outq *q,
                                 transport->rto_pending = 0;
                         }
 
+                        chunk->resent = 1;
+
                         /* Move the chunk to the retransmit queue. The chunks
                          * on the retransmit queue are always kept in order.
                          */
@@ -1375,6 +1377,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
                                  * instance).
                                  */
                                 if (!tchunk->tsn_gap_acked &&
+                                    !tchunk->resent &&
                                     tchunk->rtt_in_progress) {
                                         tchunk->rtt_in_progress = 0;
                                         rtt = jiffies - tchunk->sent_at;