From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754197AbcARDk0 (ORCPT ); Sun, 17 Jan 2016 22:40:26 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:59221 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751964AbcARDWC (ORCPT ); Sun, 17 Jan 2016 22:22:02 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Marcelo Ricardo Leitner" , "lucien" , "David S. Miller" Date: Mon, 18 Jan 2016 03:18:35 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 01/70] sctp: start t5 timer only when peer rwnd is 0 and local state is SHUTDOWN_PENDING In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.247 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.76-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: lucien commit 8a0d19c5ed417c78d03f4e0fa7215e58c40896d8 upstream. when A sends a data to B, then A close() and enter into SHUTDOWN_PENDING state, if B neither claim his rwnd is 0 nor send SACK for this data, A will keep retransmitting this data until t5 timeout, Max.Retrans times can't work anymore, which is bad. if B's rwnd is not 0, it should send abort after Max.Retrans times, only when B's rwnd == 0 and A's retransmitting beyonds Max.Retrans times, A will start t5 timer, which is also commit f8d960524328 ("sctp: Enforce retransmission limit during shutdown") means, but it lacks the condition peer rwnd == 0. so fix it by adding a bit (zero_window_announced) in peer to record if the last rwnd is 0. If it was, zero_window_announced will be set. and use this bit to decide if start t5 timer when local.state is SHUTDOWN_PENDING. Fixes: commit f8d960524328 ("sctp: Enforce retransmission limit during shutdown") Signed-off-by: Xin Long Signed-off-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller [bwh: Backported to 3.2: change sack_needed to bitfield as done earlier upstream] Signed-off-by: Ben Hutchings --- include/net/sctp/structs.h | 3 ++- net/sctp/outqueue.c | 1 + net/sctp/sm_statefuns.c | 3 ++- 3 files changed, 5 insertions(+), 2 deletions(-) --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -1586,7 +1586,8 @@ struct sctp_association { * : order. When DATA chunks are out of order, * : SACK's are not delayed (see Section 6). */ - __u8 sack_needed; /* Do we need to sack the peer? */ + __u8 sack_needed:1, /* Do we need to sack the peer? */ + zero_window_announced:1; __u32 sack_cnt; /* These are capabilities which our peer advertised. */ --- a/net/sctp/outqueue.c +++ b/net/sctp/outqueue.c @@ -1265,6 +1265,7 @@ int sctp_outq_sack(struct sctp_outq *q, */ sack_a_rwnd = ntohl(sack->a_rwnd); + asoc->peer.zero_window_announced = !sack_a_rwnd; outstanding = q->outstanding_bytes; if (outstanding < sack_a_rwnd) --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -5302,7 +5302,8 @@ sctp_disposition_t sctp_sf_do_6_3_3_rtx( SCTP_INC_STATS(SCTP_MIB_T3_RTX_EXPIREDS); if (asoc->overall_error_count >= asoc->max_retrans) { - if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { + if (asoc->peer.zero_window_announced && + asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { /* * We are here likely because the receiver had its rwnd * closed for a while and we have not been able to