On Wednesday 2010-09-01 23:34, Nicola Padovano wrote:
>> It merely means that the function is only designed to be executed by
>> ip4tables.
>yes, but this also means that when i receive a packet (=the skb
>pointer of target function) its data pointer points to the beginning
>of ip header (remember that skb->data and skb->tail mark the beginning
>and the end of header+payload of the layer X).
>am i right?
Yes, that happens to be the case. But that's why you use
skb_{mac,network,transport}_header anyway, because that is more
invariant than skb->data. (Provided restrictions on its use are obeyed.)
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