On 10/22/07, Yakov Lerner <[EMAIL PROTECTED]> 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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