netdev - Re: attach additional value to skb

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Message-ID: <178ddfde0710221418v435c9f45ie6d8cb9b7bebd288@mail.gmail.com>
Date:	Mon, 22 Oct 2007 14:18:44 -0700
From:	"Wenhua Zhao" <whzhao@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: attach additional value to skb

On 10/22/07, Yakov Lerner <iler.ml@...il.com> wrote:
> 1. How can I attach my 32-bit value to the skb in the
> PRE_ROUTNIG hook such that FORWARD and POST_ROUTING
> hooks can later access this value from the skb ?
>
> Can I use sk_buff->cb for that ?
In IP layer cb is used by IP as structure inet_skb_param.  It is
written by ip_rcv_options() (in function ip_rcv_finish()) between
PRE_ROUTING and FORWARD/POST_ROUTING.

In my opinion, cb is only used when one exclusively owns the skb.

Regards,
Wenhua
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