Commit:     3de96471bd7fb76406e975ef6387abe3a0698149
Parent:     0e835331e3111e5a92eb3a852405ea71ca8fff97
Author:     Ilpo Järvinen <[EMAIL PROTECTED]>
AuthorDate: Mon Oct 1 15:28:48 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Oct 10 16:54:00 2007 -0700

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
 net/ipv4/tcp_input.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index c1339d8..7c1a92f 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);
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