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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>
This commit is contained in:
Marcelo Ricardo Leitner 2016-03-18 18:39:18 -03:00 committed by David S. Miller
parent abbdb5a74c
commit 07b4d6a174
1 changed files with 5 additions and 1 deletions
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6
net/sctp/sm_sideeffect.c
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@ -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;