From: Gaofeng <gaofeng@cn.fujitsu.com>
To: christoph.paasch@uclouvain.be
Cc: netdev@vger.kernel.org
Subject: Re: pskb_copy() in tcp_transmit_skb()
Date: Tue, 13 Sep 2011 17:29:25 +0800 [thread overview]
Message-ID: <4E6F2275.2050902@cn.fujitsu.com> (raw)
In-Reply-To: <201109131221.37561.christoph.paasch@uclouvain.be>
于 2011年09月13日 17:21, Christoph Paasch 写道:
> Hi,
>
> I'm trying to understand the reason for the possible call to pskb_copy() in
> tcp_transmit_skb().
> I don't find, where we may have a cloned skb entering tcp_transmit_skb().
>
> The original pskb_copy() came from tcp_retransmit_skb() (commit
> dfb4b9dceb35c567a595ae5e9d035cfda044a103).
> But from that point, the git-history does not show where the pskb_copy() is
> coming from.
>
>
> Does somebody has an idea, how a cloned skb can be passed to
> tcp_transmit_skb() and thus trigger this call to pskb_copy().
>
>
> Thanks for your help,
> Christoph
>
>
> --
> Christoph Paasch
> PhD Student
>
> IP Networking Lab --- http://inl.info.ucl.ac.be
> MultiPath TCP in the Linux Kernel --- http://inl.info.ucl.ac.be/mptcp
> Université Catholique de Louvain
>
> www.rollerbulls.be
> --
> --
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>
maybe nat,nat can change the tcp packet header
next prev parent reply other threads:[~2011-09-13 9:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-13 9:21 pskb_copy() in tcp_transmit_skb() Christoph Paasch
2011-09-13 9:29 ` Gaofeng [this message]
2011-09-13 10:55 ` Christoph Paasch
2011-09-13 12:00 ` Gao feng
2011-09-13 12:02 ` Eric Dumazet
2011-09-13 12:41 ` Christoph Paasch
2011-09-13 12:51 ` Eric Dumazet
2011-09-13 16:34 ` David Miller
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