From: Wei Yongjun <yjwei@cn.fujitsu.com>
Date: Thu, 12 Mar 2009 09:49:19 +0000 (+0000)
Subject: sctp: fix to send FORWARD-TSN chunk only if peer has such capable
X-Git-Tag: firefly_0821_release~15237^2~255
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=76595024ffab3599bd28ea014f6c23c1a8c8dd2c;p=firefly-linux-kernel-4.4.55.git

sctp: fix to send FORWARD-TSN chunk only if peer has such capable

RFC3758 Section 3.3.1.  Sending Forward-TSN-Supported param in INIT

   Note that if the endpoint chooses NOT to include the parameter, then
   at no time during the life of the association can it send or process
   a FORWARD TSN.

If peer does not support PR-SCTP capable, don't send FORWARD-TSN chunk
to peer.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index a367d15a21aa..d765fc53e74d 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -1758,6 +1758,9 @@ static void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 ctsn)
 	struct sctp_chunk *chunk;
 	struct list_head *lchunk, *temp;
 
+	if (!asoc->peer.prsctp_capable)
+		return;
+
 	/* PR-SCTP C1) Let SackCumAck be the Cumulative TSN ACK carried in the
 	 * received SACK.
 	 *