netfilter: nf_tables: Open-code audit log call in nf_tables_getrule()

The table lookup will be dropped from that function, so remove that
dependency from audit logging code. Using whatever is in
nla[NFTA_RULE_TABLE] is sufficient as long as the previous rule info
filling succeded.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_tables_api.c

@@ -3589,15 +3589,18 @@ static int nf_tables_dump_rules_done(struct netlink_callback *cb)
 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
 			     const struct nlattr * const nla[])
 {
+	struct nftables_pernet *nft_net = nft_pernet(info->net);
 	struct netlink_ext_ack *extack = info->extack;
 	u8 genmask = nft_genmask_cur(info->net);
 	u8 family = info->nfmsg->nfgen_family;
+	u32 portid = NETLINK_CB(skb).portid;
 	const struct nft_chain *chain;
 	const struct nft_rule *rule;
 	struct net *net = info->net;
 	struct nft_table *table;
 	struct sk_buff *skb2;
 	bool reset = false;
+	char *buf;
 	int err;
 
 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
@@ -3637,16 +3640,24 @@ static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
 	if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
 		reset = true;
 
-	err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
+	err = nf_tables_fill_rule_info(skb2, net, portid,
 				       info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
 				       family, table, chain, rule, 0, reset);
 	if (err < 0)
 		goto err_fill_rule_info;
 
-	if (reset)
-		audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
+	if (!reset)
+		return nfnetlink_unicast(skb2, net, portid);
 
-	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
+	buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
+			nla_len(nla[NFTA_RULE_TABLE]),
+			(char *)nla_data(nla[NFTA_RULE_TABLE]),
+			nft_net->base_seq);
+	audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
+			AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
+	kfree(buf);
+
+	return nfnetlink_unicast(skb2, net, portid);
 
 err_fill_rule_info:
 	kfree_skb(skb2);