From 5f8b5cbb20e4a3bd1b02c2b9545fad0068a49d20 Mon Sep 17 00:00:00 2001
From: sg <goldsimon@gmx.de>
Date: Wed, 16 Mar 2016 21:49:37 +0100
Subject: [PATCH] reset rto timer on fast retransmission (see task #13757,
 patch by Joel Cunningham)

---
 CHANGELOG          | 3 +++
 src/core/tcp_out.c | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG b/CHANGELOG
index b427d9c4..68f7af03 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -302,6 +302,9 @@ HISTORY
 
   ++ Bugfixes:
 
+  2013-03-16: Joel Cunningham
+  * tcp_out.c: reset rto timer on fast retransmission
+
   2016-03-16: Deomid Ryabkov
   * tcp_out.c: fixed bug #46384 Segment size calculation bug with MSS != TCP_MSS
 
diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index a7b05954..74949968 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -1185,7 +1185,7 @@ tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb)
 
   /* Set retransmission timer running if it is not currently enabled
      This must be set before checking the route. */
-  if (pcb->rtime == -1) {
+  if (pcb->rtime < 0) {
     pcb->rtime = 0;
   }
 
@@ -1460,6 +1460,9 @@ tcp_rexmit_fast(struct tcp_pcb *pcb)
 
     pcb->cwnd = pcb->ssthresh + 3 * pcb->mss;
     pcb->flags |= TF_INFR;
+
+    /* Reset the retransmission timer to prevent immediate rto retransmissions */
+    pcb->rtime = 0;
   }
 }