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Message-ID: <CA+qZnSQNrp3C=6_pjVMVGxK1rH9wOE1DerzQjT3v0njZvtz8ZA@mail.gmail.com>
Date:	Mon, 24 Jun 2013 09:43:03 +0800
From:	tingwei liu <tingw.liu@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	linux-kernel@...r.kernel.org, Linus Torvalds <linus971@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re:

On Thu, Jun 20, 2013 at 8:51 PM, Jiri Slaby <jslaby@...e.cz> wrote:
> On 06/20/2013 02:28 PM, tingwei liu wrote:
>> Hi, dears:
>>
>>       On Suse 11 sp2 3.0.13 kernel. After a few days, Nginx reply
>> packets with src ip 0.0.0.0 and  dst ip 0.0.0.0。
>>       Just like https://bbs.archlinux.org/viewtopic.php?id=129304. Is
>> there a bug?
>
> You should better report this via suse's standard channels (suse
> support/bugzilla). We cannot help you otherwise.
>
> thanks,
> --
> js
> suse labs

The problem has been fixed. It is a known bug has fixed by Eric Dumazet.

commit dfd25ffffc132c00070eed64200e8950da5d7e9d
Author: Eric Dumazet <eric.dumazet@...il.com>
Date:   Sat Mar 10 09:20:21 2012 +0000

    tcp: fix syncookie regression

    commit ea4fc0d619 (ipv4: Don't use rt->rt_{src,dst} in ip_queue_xmit())
    added a serious regression on synflood handling.

    Simon Kirby discovered a successful connection was delayed by 20 seconds
    before being responsive.

    In my tests, I discovered that xmit frames were lost, and needed ~4
    retransmits and a socket dst rebuild before being really sent.

    In case of syncookie initiated connection, we use a different path to
    initialize the socket dst, and inet->cork.fl.u.ip4 is left cleared.

    As ip_queue_xmit() now depends on inet flow being setup, fix this by
    copying the temp flowi4 we use in cookie_v4_check().

    Reported-by: Simon Kirby <sim@...nation.com>
    Bisected-by: Simon Kirby <sim@...nation.com>
    Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
    Tested-by: Eric Dumazet <eric.dumazet@...il.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>
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