conntrack mark question

[Stijn Souffriau]

Hello all,

I would like to change the conntrack mark of a connection using libnl. I 
have managed to query and delete connections using the *nfnl_ct_query 
*and *nfnl_ct_del *functions but I haven't succeeded yet in modifying a 
connection. I believe that *nfnl_ct_add *would allow me to do this but 
despide returning NLE_SUCCESS I see no change in the mark.

Some of my code:
...
nfnl_ct_set_family ( ct_object, AF_INET ); // IPv4
nfnl_ct_set_proto ( ct_object, 6 ); // TCP
nfnl_ct_set_src ( ct_object, 0, src_addr );
nfnl_ct_set_dst ( ct_object, 0, dest_addr );
nfnl_ct_set_src_port( ct_object, 0, src_port );
nfnl_ct_set_dst_port( ct_object, 0, dst_port );
nfnl_ct_set_mark( ct_object, mark );
nfnl_ct_add(nfnl_conntrack_sock, ct_object, NLM_F_REQUEST|NLM_F_ACK);
...

Note that if I use these attributes, except for the mark, in a query 
then I receive the connection whose mark I meant to change.

Any help would be much appreciated.

Best Regards,

Stijn


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