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>

2 files changed, 17 insertions, 64 deletions

diff --git a/net/ipv4/netfilter/nf_tables_arp.c b/net/ipv4/netfilter/nf_tables_arp.c
index f9089b2ad905..07667388ceb5 100644
--- a/net/ipv4/netfilter/nf_tables_arp.c
+++ b/net/ipv4/netfilter/nf_tables_arp.c
@@ -32,34 +32,6 @@ static struct nft_af_info nft_af_arp __read_mostly = {
 	.owner		= THIS_MODULE,
 };
 
-static int nf_tables_arp_init_net(struct net *net)
-{
-	net->nft.arp = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
-	if (net->nft.arp== NULL)
-		return -ENOMEM;
-
-	memcpy(net->nft.arp, &nft_af_arp, sizeof(nft_af_arp));
-
-	if (nft_register_afinfo(net, net->nft.arp) < 0)
-		goto err;
-
-	return 0;
-err:
-	kfree(net->nft.arp);
-	return -ENOMEM;
-}
-
-static void nf_tables_arp_exit_net(struct net *net)
-{
-	nft_unregister_afinfo(net, net->nft.arp);
-	kfree(net->nft.arp);
-}
-
-static struct pernet_operations nf_tables_arp_net_ops = {
-	.init   = nf_tables_arp_init_net,
-	.exit   = nf_tables_arp_exit_net,
-};
-
 static const struct nf_chain_type filter_arp = {
 	.name		= "filter",
 	.type		= NFT_CHAIN_T_DEFAULT,
@@ -77,21 +49,26 @@ static int __init nf_tables_arp_init(void)
 {
 	int ret;
 
-	ret = nft_register_chain_type(&filter_arp);
+	ret = nft_register_afinfo(&nft_af_arp);
 	if (ret < 0)
 		return ret;
 
-	ret = register_pernet_subsys(&nf_tables_arp_net_ops);
+	ret = nft_register_chain_type(&filter_arp);
 	if (ret < 0)
-		nft_unregister_chain_type(&filter_arp);
+		goto err_register_chain;
+
+	return 0;
+
+err_register_chain:
+	nft_unregister_chain_type(&filter_arp);
 
 	return ret;
 }
 
 static void __exit nf_tables_arp_exit(void)
 {
-	unregister_pernet_subsys(&nf_tables_arp_net_ops);
 	nft_unregister_chain_type(&filter_arp);
+	nft_unregister_afinfo(&nft_af_arp);
 }
 
 module_init(nf_tables_arp_init);
diff --git a/net/ipv4/netfilter/nf_tables_ipv4.c b/net/ipv4/netfilter/nf_tables_ipv4.c
index a98f2de63771..e1441738acb4 100644
--- a/net/ipv4/netfilter/nf_tables_ipv4.c
+++ b/net/ipv4/netfilter/nf_tables_ipv4.c
@@ -35,34 +35,6 @@ static struct nft_af_info nft_af_ipv4 __read_mostly = {
 	.owner		= THIS_MODULE,
 };
 
-static int nf_tables_ipv4_init_net(struct net *net)
-{
-	net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
-	if (net->nft.ipv4 == NULL)
-		return -ENOMEM;
-
-	memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4));
-
-	if (nft_register_afinfo(net, net->nft.ipv4) < 0)
-		goto err;
-
-	return 0;
-err:
-	kfree(net->nft.ipv4);
-	return -ENOMEM;
-}
-
-static void nf_tables_ipv4_exit_net(struct net *net)
-{
-	nft_unregister_afinfo(net, net->nft.ipv4);
-	kfree(net->nft.ipv4);
-}
-
-static struct pernet_operations nf_tables_ipv4_net_ops = {
-	.init	= nf_tables_ipv4_init_net,
-	.exit	= nf_tables_ipv4_exit_net,
-};
-
 static const struct nf_chain_type filter_ipv4 = {
 	.name		= "filter",
 	.type		= NFT_CHAIN_T_DEFAULT,
@@ -86,21 +58,25 @@ static int __init nf_tables_ipv4_init(void)
 {
 	int ret;
 
-	ret = nft_register_chain_type(&filter_ipv4);
+	ret = nft_register_afinfo(&nft_af_ipv4);
 	if (ret < 0)
 		return ret;
 
-	ret = register_pernet_subsys(&nf_tables_ipv4_net_ops);
+	ret = nft_register_chain_type(&filter_ipv4);
 	if (ret < 0)
-		nft_unregister_chain_type(&filter_ipv4);
+		goto err_register_chain;
+
+	return 0;
 
+err_register_chain:
+	nft_unregister_afinfo(&nft_af_ipv4);
 	return ret;
 }
 
 static void __exit nf_tables_ipv4_exit(void)
 {
-	unregister_pernet_subsys(&nf_tables_ipv4_net_ops);
 	nft_unregister_chain_type(&filter_ipv4);
+	nft_unregister_afinfo(&nft_af_ipv4);
 }
 
 module_init(nf_tables_ipv4_init);