> 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? -- Nicola Padovano e-mail: nicola.padovano@xxxxxxxxx web: http://npadovano.altervista.org -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html