netfilter: nf_tables: get rid of pernet families

Now that we have a single table list for each netns, we can get rid of
one pointer per family and the global afinfo list, thus, shrinking
struct netns for nftables that now becomes 64 bytes smaller.

And call __nft_release_afinfo() from __net_exit path accordingly to
release netnamespace objects on removal.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 43 insertions, 101 deletions

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 084d1f553c46..b0ff26beec80 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -26,6 +26,7 @@
 static LIST_HEAD(nf_tables_expressions);
 static LIST_HEAD(nf_tables_objects);
 static LIST_HEAD(nf_tables_flowtables);
+static LIST_HEAD(nf_tables_af_info);
 
 /**
  *	nft_register_afinfo - register nf_tables address family info
@@ -35,17 +36,15 @@ static LIST_HEAD(nf_tables_flowtables);
  *	Register the address family for use with nf_tables. Returns zero on
  *	success or a negative errno code otherwise.
  */
-int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
+int nft_register_afinfo(struct nft_af_info *afi)
 {
 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
-	list_add_tail_rcu(&afi->list, &net->nft.af_info);
+	list_add_tail_rcu(&afi->list, &nf_tables_af_info);
 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(nft_register_afinfo);
 
-static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
-
 /**
  *	nft_unregister_afinfo - unregister nf_tables address family info
  *
@@ -53,10 +52,9 @@ static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
  *
  *	Unregister the address family for use with nf_tables.
  */
-void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
+void nft_unregister_afinfo(struct nft_af_info *afi)
 {
 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
-	__nft_release_afinfo(net, afi);
 	list_del_rcu(&afi->list);
 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
 }
@@ -66,7 +64,7 @@ static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
 {
 	struct nft_af_info *afi;
 
-	list_for_each_entry(afi, &net->nft.af_info, list) {
+	list_for_each_entry(afi, &nf_tables_af_info, list) {
 		if (afi->family == family)
 			return afi;
 	}
@@ -5042,15 +5040,12 @@ void nft_flow_table_iterate(struct net *net,
 			    void *data)
 {
 	struct nft_flowtable *flowtable;
-	const struct nft_af_info *afi;
 	const struct nft_table *table;
 
 	rcu_read_lock();
-	list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
-		list_for_each_entry_rcu(table, &net->nft.tables, list) {
-			list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
-				iter(&flowtable->data, data);
-			}
+	list_for_each_entry_rcu(table, &net->nft.tables, list) {
+		list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
+			iter(&flowtable->data, data);
 		}
 	}
 	rcu_read_unlock();
@@ -6533,21 +6528,6 @@ int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
 }
 EXPORT_SYMBOL_GPL(nft_data_dump);
 
-static int __net_init nf_tables_init_net(struct net *net)
-{
-	INIT_LIST_HEAD(&net->nft.af_info);
-	INIT_LIST_HEAD(&net->nft.tables);
-	INIT_LIST_HEAD(&net->nft.commit_list);
-	net->nft.base_seq = 1;
-	return 0;
-}
-
-static void __net_exit nf_tables_exit_net(struct net *net)
-{
-	WARN_ON_ONCE(!list_empty(&net->nft.af_info));
-	WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
-}
-
 int __nft_release_basechain(struct nft_ctx *ctx)
 {
 	struct nft_rule *rule, *nr;
@@ -6568,8 +6548,7 @@ int __nft_release_basechain(struct nft_ctx *ctx)
 }
 EXPORT_SYMBOL_GPL(__nft_release_basechain);
 
-/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
-static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
+static void __nft_release_afinfo(struct net *net)
 {
 	struct nft_flowtable *flowtable, *nf;
 	struct nft_table *table, *nt;
@@ -6579,10 +6558,11 @@ static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
 	struct nft_set *set, *ns;
 	struct nft_ctx ctx = {
 		.net	= net,
-		.family	= afi->family,
 	};
 
 	list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
+		ctx.family = table->afi->family;
+
 		list_for_each_entry(chain, &table->chains, list)
 			nf_tables_unregister_hook(net, table, chain);
 		list_for_each_entry(flowtable, &table->flowtables, list)
@@ -6623,6 +6603,21 @@ static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
 	}
 }
 
+static int __net_init nf_tables_init_net(struct net *net)
+{
+	INIT_LIST_HEAD(&net->nft.tables);
+	INIT_LIST_HEAD(&net->nft.commit_list);
+	net->nft.base_seq = 1;
+	return 0;
+}
+
+static void __net_exit nf_tables_exit_net(struct net *net)
+{
+	__nft_release_afinfo(net);
+	WARN_ON_ONCE(!list_empty(&net->nft.tables));
+	WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
+}
+
 static struct pernet_operations nf_tables_net_ops = {
 	.init	= nf_tables_init_net,
 	.exit	= nf_tables_exit_net,
diff --git a/net/netfilter/nf_tables_inet.c b/net/netfilter/nf_tables_inet.c
index 00b1fc9cea2e..d486ced4de84 100644
--- a/net/netfilter/nf_tables_inet.c
+++ b/net/netfilter/nf_tables_inet.c
@@ -43,34 +43,6 @@ static struct nft_af_info nft_af_inet __read_mostly = {
 	.owner		= THIS_MODULE,
 };
 
-static int __net_init nf_tables_inet_init_net(struct net *net)
-{
-	net->nft.inet = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
-	if (net->nft.inet == NULL)
-		return -ENOMEM;
-	memcpy(net->nft.inet, &nft_af_inet, sizeof(nft_af_inet));
-
-	if (nft_register_afinfo(net, net->nft.inet) < 0)
-		goto err;
-
-	return 0;
-
-err:
-	kfree(net->nft.inet);
-	return -ENOMEM;
-}
-
-static void __net_exit nf_tables_inet_exit_net(struct net *net)
-{
-	nft_unregister_afinfo(net, net->nft.inet);
-	kfree(net->nft.inet);
-}
-
-static struct pernet_operations nf_tables_inet_net_ops = {
-	.init	= nf_tables_inet_init_net,
-	.exit	= nf_tables_inet_exit_net,
-};
-
 static const struct nf_chain_type filter_inet = {
 	.name		= "filter",
 	.type		= NFT_CHAIN_T_DEFAULT,
@@ -94,21 +66,24 @@ static int __init nf_tables_inet_init(void)
 {
 	int ret;
 
-	ret = nft_register_chain_type(&filter_inet);
-	if (ret < 0)
+	if (nft_register_afinfo(&nft_af_inet) < 0)
 		return ret;
 
-	ret = register_pernet_subsys(&nf_tables_inet_net_ops);
+	ret = nft_register_chain_type(&filter_inet);
 	if (ret < 0)
-		nft_unregister_chain_type(&filter_inet);
+		goto err_register_chain;
+
+	return ret;
 
+err_register_chain:
+	nft_unregister_afinfo(&nft_af_inet);
 	return ret;
 }
 
 static void __exit nf_tables_inet_exit(void)
 {
-	unregister_pernet_subsys(&nf_tables_inet_net_ops);
 	nft_unregister_chain_type(&filter_inet);
+	nft_unregister_afinfo(&nft_af_inet);
 }
 
 module_init(nf_tables_inet_init);
diff --git a/net/netfilter/nf_tables_netdev.c b/net/netfilter/nf_tables_netdev.c
index 01b61a67a2ac..404b49acb125 100644
--- a/net/netfilter/nf_tables_netdev.c
+++ b/net/netfilter/nf_tables_netdev.c
@@ -43,34 +43,6 @@ static struct nft_af_info nft_af_netdev __read_mostly = {
 	.owner		= THIS_MODULE,
 };
 
-static int nf_tables_netdev_init_net(struct net *net)
-{
-	net->nft.netdev = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
-	if (net->nft.netdev == NULL)
-		return -ENOMEM;
-
-	memcpy(net->nft.netdev, &nft_af_netdev, sizeof(nft_af_netdev));
-
-	if (nft_register_afinfo(net, net->nft.netdev) < 0)
-		goto err;
-
-	return 0;
-err:
-	kfree(net->nft.netdev);
-	return -ENOMEM;
-}
-
-static void nf_tables_netdev_exit_net(struct net *net)
-{
-	nft_unregister_afinfo(net, net->nft.netdev);
-	kfree(net->nft.netdev);
-}
-
-static struct pernet_operations nf_tables_netdev_net_ops = {
-	.init	= nf_tables_netdev_init_net,
-	.exit	= nf_tables_netdev_exit_net,
-};
-
 static const struct nf_chain_type nft_filter_chain_netdev = {
 	.name		= "filter",
 	.type		= NFT_CHAIN_T_DEFAULT,
@@ -145,32 +117,32 @@ static int __init nf_tables_netdev_init(void)
 {
 	int ret;
 
-	ret = nft_register_chain_type(&nft_filter_chain_netdev);
-	if (ret)
+	if (nft_register_afinfo(&nft_af_netdev) < 0)
 		return ret;
 
-	ret = register_pernet_subsys(&nf_tables_netdev_net_ops);
+	ret = nft_register_chain_type(&nft_filter_chain_netdev);
 	if (ret)
-		goto err1;
+		goto err_register_chain_type;
 
 	ret = register_netdevice_notifier(&nf_tables_netdev_notifier);
 	if (ret)
-		goto err2;
+		goto err_register_netdevice_notifier;
 
 	return 0;
 
-err2:
-	unregister_pernet_subsys(&nf_tables_netdev_net_ops);
-err1:
+err_register_netdevice_notifier:
 	nft_unregister_chain_type(&nft_filter_chain_netdev);
+err_register_chain_type:
+	nft_unregister_afinfo(&nft_af_netdev);
+
 	return ret;
 }
 
 static void __exit nf_tables_netdev_exit(void)
 {
 	unregister_netdevice_notifier(&nf_tables_netdev_notifier);
-	unregister_pernet_subsys(&nf_tables_netdev_net_ops);
 	nft_unregister_chain_type(&nft_filter_chain_netdev);
+	nft_unregister_afinfo(&nft_af_netdev);
 }
 
 module_init(nf_tables_netdev_init);