netfilter: move zone info into struct nf_conn

Curently we store zone information as a conntrack extension.
This has one drawback: for every lookup we need to fetch the zone data
from the extension area.

This change place the zone data directly into the main conntrack object
structure and then removes the zone conntrack extension.

The zone data is just 4 bytes, it fits into a padding hole before
the tuplehash info, so we do not even increase the nf_conn structure size.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 31 deletions

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 2903bb43547c..a459176c3253 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -327,16 +327,10 @@ struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
 
 	tmpl->status = IPS_TEMPLATE;
 	write_pnet(&tmpl->ct_net, net);
-
-	if (nf_ct_zone_add(tmpl, flags, zone) < 0)
-		goto out_free;
-
+	nf_ct_zone_add(tmpl, zone);
 	atomic_set(&tmpl->ct_general.use, 0);
 
 	return tmpl;
-out_free:
-	kfree(tmpl);
-	return NULL;
 }
 EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc);
 
@@ -929,16 +923,13 @@ __nf_conntrack_alloc(struct net *net,
 	       offsetof(struct nf_conn, proto) -
 	       offsetof(struct nf_conn, __nfct_init_offset[0]));
 
-	if (zone && nf_ct_zone_add(ct, GFP_ATOMIC, zone) < 0)
-		goto out_free;
+	nf_ct_zone_add(ct, zone);
 
 	/* Because we use RCU lookups, we set ct_general.use to zero before
 	 * this is inserted in any list.
 	 */
 	atomic_set(&ct->ct_general.use, 0);
 	return ct;
-out_free:
-	kmem_cache_free(nf_conntrack_cachep, ct);
 out:
 	atomic_dec(&net->ct.count);
 	return ERR_PTR(-ENOMEM);
@@ -1342,14 +1333,6 @@ bool __nf_ct_kill_acct(struct nf_conn *ct,
 }
 EXPORT_SYMBOL_GPL(__nf_ct_kill_acct);
 
-#ifdef CONFIG_NF_CONNTRACK_ZONES
-static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = {
-	.len	= sizeof(struct nf_conntrack_zone),
-	.align	= __alignof__(struct nf_conntrack_zone),
-	.id	= NF_CT_EXT_ZONE,
-};
-#endif
-
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 
 #include <linux/netfilter/nfnetlink.h>
@@ -1532,9 +1515,6 @@ void nf_conntrack_cleanup_end(void)
 
 	nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size);
 
-#ifdef CONFIG_NF_CONNTRACK_ZONES
-	nf_ct_extend_unregister(&nf_ct_zone_extend);
-#endif
 	nf_conntrack_proto_fini();
 	nf_conntrack_seqadj_fini();
 	nf_conntrack_labels_fini();
@@ -1771,11 +1751,6 @@ int nf_conntrack_init_start(void)
 	if (ret < 0)
 		goto err_seqadj;
 
-#ifdef CONFIG_NF_CONNTRACK_ZONES
-	ret = nf_ct_extend_register(&nf_ct_zone_extend);
-	if (ret < 0)
-		goto err_extend;
-#endif
 	ret = nf_conntrack_proto_init();
 	if (ret < 0)
 		goto err_proto;
@@ -1791,10 +1766,6 @@ int nf_conntrack_init_start(void)
 	return 0;
 
 err_proto:
-#ifdef CONFIG_NF_CONNTRACK_ZONES
-	nf_ct_extend_unregister(&nf_ct_zone_extend);
-err_extend:
-#endif
 	nf_conntrack_seqadj_fini();
 err_seqadj:
 	nf_conntrack_labels_fini();