From eab6797fe5e3c39b434297074e4c74248d745f0d Mon Sep 17 00:00:00 2001
From: tuexen <tuexen@FreeBSD.org>
Date: Sat, 6 Nov 2010 13:43:18 +0000
Subject: [PATCH] Do not resend DATA chunks without delay when dropped by the
 peer and the CRC was correct.

MFC after: 3 days.
---
 sys/netinet/sctp_input.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/netinet/sctp_input.c b/sys/netinet/sctp_input.c
index 8dffd4df963d..e30f12b801cd 100644
--- a/sys/netinet/sctp_input.c
+++ b/sys/netinet/sctp_input.c
@@ -3115,6 +3115,10 @@ process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
 			if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
 				uint8_t *ddp;
 
+				if (((flg & SCTP_BADCRC) == 0) &&
+				    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
+					return (0);
+				}
 				if ((stcb->asoc.peers_rwnd == 0) &&
 				    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
 					SCTP_STAT_INCR(sctps_pdrpdiwnp);