netfilter: synproxy: only register hooks when needed

Defer registration of the synproxy hooks until the first SYNPROXY rule is
added.  Also means we only register hooks in namespaces that need it.

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

1 files changed, 39 insertions, 34 deletions

diff --git a/net/ipv4/netfilter/ipt_SYNPROXY.c b/net/ipv4/netfilter/ipt_SYNPROXY.c
index 3240a2614e82..c308ee0ee0bc 100644
--- a/net/ipv4/netfilter/ipt_SYNPROXY.c
+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
@@ -409,19 +409,56 @@ static unsigned int ipv4_synproxy_hook(void *priv,
 	return NF_ACCEPT;
 }
 
+static struct nf_hook_ops ipv4_synproxy_ops[] __read_mostly = {
+	{
+		.hook		= ipv4_synproxy_hook,
+		.pf		= NFPROTO_IPV4,
+		.hooknum	= NF_INET_LOCAL_IN,
+		.priority	= NF_IP_PRI_CONNTRACK_CONFIRM - 1,
+	},
+	{
+		.hook		= ipv4_synproxy_hook,
+		.pf		= NFPROTO_IPV4,
+		.hooknum	= NF_INET_POST_ROUTING,
+		.priority	= NF_IP_PRI_CONNTRACK_CONFIRM - 1,
+	},
+};
+
 static int synproxy_tg4_check(const struct xt_tgchk_param *par)
 {
+	struct synproxy_net *snet = synproxy_pernet(par->net);
 	const struct ipt_entry *e = par->entryinfo;
+	int err;
 
 	if (e->ip.proto != IPPROTO_TCP ||
 	    e->ip.invflags & XT_INV_PROTO)
 		return -EINVAL;
 
-	return nf_ct_netns_get(par->net, par->family);
+	err = nf_ct_netns_get(par->net, par->family);
+	if (err)
+		return err;
+
+	if (snet->hook_ref4 == 0) {
+		err = nf_register_net_hooks(par->net, ipv4_synproxy_ops,
+					    ARRAY_SIZE(ipv4_synproxy_ops));
+		if (err) {
+			nf_ct_netns_put(par->net, par->family);
+			return err;
+		}
+	}
+
+	snet->hook_ref4++;
+	return err;
 }
 
 static void synproxy_tg4_destroy(const struct xt_tgdtor_param *par)
 {
+	struct synproxy_net *snet = synproxy_pernet(par->net);
+
+	snet->hook_ref4--;
+	if (snet->hook_ref4 == 0)
+		nf_unregister_net_hooks(par->net, ipv4_synproxy_ops,
+					ARRAY_SIZE(ipv4_synproxy_ops));
 	nf_ct_netns_put(par->net, par->family);
 }
 
@@ -436,46 +473,14 @@ static struct xt_target synproxy_tg4_reg __read_mostly = {
 	.me		= THIS_MODULE,
 };
 
-static struct nf_hook_ops ipv4_synproxy_ops[] __read_mostly = {
-	{
-		.hook		= ipv4_synproxy_hook,
-		.pf		= NFPROTO_IPV4,
-		.hooknum	= NF_INET_LOCAL_IN,
-		.priority	= NF_IP_PRI_CONNTRACK_CONFIRM - 1,
-	},
-	{
-		.hook		= ipv4_synproxy_hook,
-		.pf		= NFPROTO_IPV4,
-		.hooknum	= NF_INET_POST_ROUTING,
-		.priority	= NF_IP_PRI_CONNTRACK_CONFIRM - 1,
-	},
-};
-
 static int __init synproxy_tg4_init(void)
 {
-	int err;
-
-	err = nf_register_hooks(ipv4_synproxy_ops,
-				ARRAY_SIZE(ipv4_synproxy_ops));
-	if (err < 0)
-		goto err1;
-
-	err = xt_register_target(&synproxy_tg4_reg);
-	if (err < 0)
-		goto err2;
-
-	return 0;
-
-err2:
-	nf_unregister_hooks(ipv4_synproxy_ops, ARRAY_SIZE(ipv4_synproxy_ops));
-err1:
-	return err;
+	return xt_register_target(&synproxy_tg4_reg);
 }
 
 static void __exit synproxy_tg4_exit(void)
 {
 	xt_unregister_target(&synproxy_tg4_reg);
-	nf_unregister_hooks(ipv4_synproxy_ops, ARRAY_SIZE(ipv4_synproxy_ops));
 }
 
 module_init(synproxy_tg4_init);