linux-kernel - [PATCH 3.4 073/107] sctp: donot reset the overall_error_count in SHUTDOWN

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Message-Id: <1458115601-5762-73-git-send-email-lizf@kernel.org>
Date:	Wed, 16 Mar 2016 16:06:07 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, lucien <lucien.xin@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 073/107] sctp: donot reset the overall_error_count in SHUTDOWN_RECEIVE state

From: lucien <lucien.xin@...il.com>

3.4.111-rc1 review patch.  If anyone has any objections, please let me know.

------------------

commit f648f807f61e64d247d26611e34cc97e4ed03401 upstream.

Commit f8d960524328 ("sctp: Enforce retransmission limit during shutdown")
fixed a problem with excessive retransmissions in the SHUTDOWN_PENDING by not
resetting the association overall_error_count.  This allowed the association
to better enforce assoc.max_retrans limit.

However, the same issue still exists when the association is in SHUTDOWN_RECEIVED
state.  In this state, HB-ACKs will continue to reset the overall_error_count
for the association would extend the lifetime of association unnecessarily.

This patch solves this by resetting the overall_error_count whenever the current
state is small then SCTP_STATE_SHUTDOWN_PENDING.  As a small side-effect, we
end up also handling SCTP_STATE_SHUTDOWN_ACK_SENT and SCTP_STATE_SHUTDOWN_SENT
states, but they are not really impacted because we disable Heartbeats in those
states.

Fixes: Commit f8d960524328 ("sctp: Enforce retransmission limit during shutdown")
Signed-off-by: Xin Long <lucien.xin@...il.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Acked-by: Vlad Yasevich <vyasevich@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 net/sctp/sm_sideeffect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 1ff51c9..5fa033a 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -682,7 +682,7 @@ static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
 	 * outstanding data and rely on the retransmission limit be reached
 	 * to shutdown the association.
 	 */
-	if (t->asoc->state != SCTP_STATE_SHUTDOWN_PENDING)
+	if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING)
 		t->asoc->overall_error_count = 0;

 	/* Clear the hb_sent flag to signal that we had a good
-- 
1.9.1