lucien 8a26248a33 sctp: start t5 timer only when peer rwnd is 0 and local state is SHUTDOWN_PENDING ... 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 f8d9605243 ("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 f8d9605243 ("sctp: Enforce retransmission limit during shutdown") Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> [bwh: Backported to 3.2: change sack_needed to bitfield as done earlier upstream] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Zefan Li <lizefan@huawei.com>		2016-10-26 23:15:35 +08:00
..
auth.h
checksum.h	sctp: Clean up sctp checksumming code	2009-02-16 00:03:10 -08:00
command.h	sctp: deal with multiple COOKIE_ECHO chunks	2011-09-16 17:17:22 -04:00
constants.h	sctp: remove completely unsed EMPTY state	2011-04-20 01:51:03 -07:00
sctp.h	net: sctp: fix panic on duplicate ASCONF chunks	2015-04-14 17:33:57 +08:00
sm.h	net: sctp: fix skb_over_panic when receiving malformed ASCONF chunks	2015-04-14 17:33:57 +08:00
structs.h	sctp: start t5 timer only when peer rwnd is 0 and local state is SHUTDOWN_PENDING	2016-10-26 23:15:35 +08:00
tsnmap.h	net: return operator cleanup	2010-09-23 14:33:39 -07:00
ulpevent.h	sctp: ABORT if receive, reassmbly, or reodering queue is not empty while closing socket	2011-07-08 09:53:08 -07:00
ulpqueue.h
user.h	sctp: Add socket option operation for Auto-ASCONF.	2011-06-02 02:04:53 -07:00