From 3de96471bd7fb76406e975ef6387abe3a0698149 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ilpo=20J=C3=A4rvinen?= Date: Mon, 1 Oct 2007 15:28:48 -0700 Subject: [PATCH] [TCP]: Wrap-safed reordering detection FRTO check MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: David S. Miller --- net/ipv4/tcp_input.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index c1339d88bbf..7c1a92ffa08 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -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); -- 2.41.0