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[TCP]: Wrap-safed reordering detection FRTO check 

In case somebody has a suggestion about a better place for this
check, which must guarantee execution "early enough" (i.e,
before the wrap can occur), I'm very open to them.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2007-10-01 15:28:48 -07:00 committed by David S. Miller
parent 0e835331e3
commit 3de96471bd
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/tcp_input.c
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@ -3027,6 +3027,9 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
/* See if we can take anything off of the retransmit queue. */
flag |= tcp_clean_rtx_queue(sk, &seq_rtt);
/* Guarantee sacktag reordering detection against wrap-arounds */
if (before(tp->frto_highmark, tp->snd_una))
tp->frto_highmark = 0;
if (tp->frto_counter)
frto_cwnd = tcp_process_frto(sk, flag);