logging rule ID

[Ken-ichirou MATSUZAWA <chamaken@gmail.com>]

 Hi,

We manage firewall appliance products. A few of them can log not
only packet information but also log which rule number or rule ID
causes to log. I know nflog can do so by specifying log-prefix but
user must keep the uniqueness, it seems troublesome.

Based on it, how about passing systematic id to nflog? I think one
of a way is introducing holder struct like

    struct nft_rule_key {
         char *chain_name;
         u64  rule_handle;
    };

and add it to struct nft_pktinfo member. A Rule identifier --- chain
name and rule handle number --- can be passed to eval() callback by
setting those in nft_do_chain()::nf_tables_core.c before calling
eval() callback.

But I don't know whether this way adapts to the whole nft design or
not. And it seems that big change will be needed after passing
nft_rule_key to nft_log_eval().

Then, please let me ask three questions:

* Is there a way to identify the rule which rule outputs log without
  log-prefix?

* Is there a plan to identify the rule from log?

* How do I progress in nft_log_eval() if this method, passing rule
  identifier to nflog_log_eval(), can be acceptable?

Thanks,