Commit 07b4d6a1 authored Mar 18, 2016 by Marcelo Ricardo Leitner Committed by David S. Miller Mar 20, 2016

sctp: do not update a_rwnd if we are not issuing a sack



The SACK can be lost pretty much elsewhere, but if its allocation fail,
we know we are not sending it, so it is better to revert a_rwnd to its
previous value as this may give it a chance to issue a window update
later.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent abbdb5a7

net/sctp/sm_sideeffect.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -215,10 +215,14 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
		sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
		SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
		} else {
		__u32 old_a_rwnd = asoc->a_rwnd;

		asoc->a_rwnd = asoc->rwnd;
		sack = sctp_make_sack(asoc);
		if (!sack)
		if (!sack) {
		asoc->a_rwnd = old_a_rwnd;
		goto nomem;
		}

		asoc->peer.sack_needed = 0;
		asoc->peer.sack_cnt = 0;