On Mon, Sep 03, 2012 at 05:35:56PM +0100, Nicole wrote:
> Hello everyone,
>
> I would be grateful for some advice. Am writing a target using xtables.
> This target saves and restores a field in the IPv{4,6} header to/from
> the connection mark.
>
> I have read Jan Engelhardt's booklet (3 July 2012), but remain unclear
> on how to ensure that connection tracking is turned on.
>
> My difficulty arises in the following code snippet:
>
> const struct nf_conn *ct;
> ct = nf_ct_get(skb, &ctinfo);
> if (ct == NULL) {
> return false;
> }
> /* use ct-> */
>
> ct is always false and therefore I cannot do the save and restore.
>
> Any suggestions?
Make sure nf_conntrack and nf_conntrack_ipv4 are loaded.
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