netfilter: nat: remove l3proto struct

All l3proto function pointers have been removed.

Signed-off-by: Florian Westphal <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

include/net/netfilter/nf_nat_l3proto.h

···
 #ifndef _NF_NAT_L3PROTO_H
 #define _NF_NAT_L3PROTO_H
 
-struct nf_nat_l3proto {
-	u8	l3proto;
-};
-
 unsigned int nf_nat_manip_pkt(struct sk_buff *skb, struct nf_conn *ct,
 			      enum nf_nat_manip_type mtype,
 			      enum ip_conntrack_dir dir);
 void nf_nat_csum_recalc(struct sk_buff *skb,
 			u8 nfproto, u8 proto, void *data, __sum16 *check,
 			int datalen, int oldlen);
-
-int nf_nat_l3proto_register(const struct nf_nat_l3proto *);
-void nf_nat_l3proto_unregister(const struct nf_nat_l3proto *);
-const struct nf_nat_l3proto *__nf_nat_l3proto_find(u8 l3proto);
 
 int nf_nat_icmp_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
 				  enum ip_conntrack_info ctinfo,

net/netfilter/nf_nat_core.c

···
 static spinlock_t nf_nat_locks[CONNTRACK_LOCKS];
 
 static DEFINE_MUTEX(nf_nat_proto_mutex);
-static const struct nf_nat_l3proto __rcu *nf_nat_l3protos[NFPROTO_NUMPROTO]
-						__read_mostly;
 static unsigned int nat_net_id __read_mostly;
 
 static struct hlist_head *nf_nat_bysource __read_mostly;
···
 struct nat_net {
 	struct nf_nat_hooks_net nat_proto_net[NFPROTO_NUMPROTO];
 };
-
-inline const struct nf_nat_l3proto *
-__nf_nat_l3proto_find(u8 family)
-{
-	return rcu_dereference(nf_nat_l3protos[family]);
-}
 
 #ifdef CONFIG_XFRM
 static void nf_nat_ipv4_decode_session(struct sk_buff *skb,
···
 	return 0;
 }
 
-static void nf_nat_l3proto_clean(u8 l3proto)
-{
-	struct nf_nat_proto_clean clean = {
-		.l3proto = l3proto,
-	};
-
-	nf_ct_iterate_destroy(nf_nat_proto_remove, &clean);
-}
-
-int nf_nat_l3proto_register(const struct nf_nat_l3proto *l3proto)
-{
-	RCU_INIT_POINTER(nf_nat_l3protos[l3proto->l3proto], l3proto);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(nf_nat_l3proto_register);
-
-void nf_nat_l3proto_unregister(const struct nf_nat_l3proto *l3proto)
-{
-	mutex_lock(&nf_nat_proto_mutex);
-	RCU_INIT_POINTER(nf_nat_l3protos[l3proto->l3proto], NULL);
-	mutex_unlock(&nf_nat_proto_mutex);
-	synchronize_rcu();
-
-	nf_nat_l3proto_clean(l3proto->l3proto);
-}
-EXPORT_SYMBOL_GPL(nf_nat_l3proto_unregister);
-
 /* No one using conntrack by the time this called. */
 static void nf_nat_cleanup_conntrack(struct nf_conn *ct)
 {
···
 	mutex_unlock(&nf_nat_proto_mutex);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(nf_nat_register_fn);
 
 void nf_nat_unregister_fn(struct net *net, const struct nf_hook_ops *ops,
 		          unsigned int ops_count)
···
 unlock:
 	mutex_unlock(&nf_nat_proto_mutex);
 }
-EXPORT_SYMBOL_GPL(nf_nat_unregister_fn);
 
 static struct pernet_operations nat_net_ops = {
 	.id = &nat_net_id,
···
 	.manip_pkt		= nf_nat_manip_pkt,
 };
 
-int nf_nat_l3proto_init(void);
-void nf_nat_l3proto_exit(void);
 static int __init nf_nat_init(void)
 {
 	int ret, i;
···
 	WARN_ON(nf_nat_hook != NULL);
 	RCU_INIT_POINTER(nf_nat_hook, &nat_hook);
 
-	ret = nf_nat_l3proto_init();
-	if (ret) {
-		nf_ct_extend_unregister(&nat_extend);
-		nf_ct_helper_expectfn_unregister(&follow_master_nat);
-		RCU_INIT_POINTER(nf_nat_hook, NULL);
-
-		synchronize_net();
-		kvfree(nf_nat_bysource);
-		unregister_pernet_subsys(&nat_net_ops);
-
-		return ret;
-	}
-
 	return 0;
 }
 
···
 	struct nf_nat_proto_clean clean = {};
 
 	nf_ct_iterate_destroy(nf_nat_proto_clean, &clean);
-
-	nf_nat_l3proto_exit();
 
 	nf_ct_extend_unregister(&nat_extend);
 	nf_ct_helper_expectfn_unregister(&follow_master_nat);

net/netfilter/nf_nat_proto.c

···
 #include <net/netfilter/nf_conntrack.h>
 #include <linux/netfilter/nfnetlink_conntrack.h>
 
-static const struct nf_nat_l3proto nf_nat_l3proto_ipv4;
-#if IS_ENABLED(CONFIG_IPV6)
-static const struct nf_nat_l3proto nf_nat_l3proto_ipv6;
-#endif
-
 static void nf_csum_update(struct sk_buff *skb,
 			   unsigned int iphdroff, __sum16 *check,
 			   const struct nf_conntrack_tuple *t,
···
 	WARN_ON_ONCE(1);
 }
 
-static const struct nf_nat_l3proto nf_nat_l3proto_ipv4 = {
-	.l3proto		= NFPROTO_IPV4,
-};
-
 int nf_nat_icmp_reply_translation(struct sk_buff *skb,
 				  struct nf_conn *ct,
 				  enum ip_conntrack_info ctinfo,
···
 }
 EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv4_unregister_fn);
 
-int nf_nat_l3proto_init(void)
-{
-	int ret = nf_nat_l3proto_register(&nf_nat_l3proto_ipv4);
-
 #if IS_ENABLED(CONFIG_IPV6)
-	if (ret)
-		return ret;
-
-	ret = nf_nat_l3proto_register(&nf_nat_l3proto_ipv6);
-	if (ret == 0)
-		return ret;
-
-	nf_nat_l3proto_unregister(&nf_nat_l3proto_ipv4);
-#endif
-	return ret;
-}
-
-void nf_nat_l3proto_exit(void)
-{
-#if IS_ENABLED(CONFIG_IPV6)
-	nf_nat_l3proto_unregister(&nf_nat_l3proto_ipv6);
-#endif
-	nf_nat_l3proto_unregister(&nf_nat_l3proto_ipv4);
-}
-
-#if IS_ENABLED(CONFIG_IPV6)
-static const struct nf_nat_l3proto nf_nat_l3proto_ipv6 = {
-	.l3proto		= NFPROTO_IPV6,
-};
-
 int nf_nat_icmpv6_reply_translation(struct sk_buff *skb,
 				    struct nf_conn *ct,
 				    enum ip_conntrack_info ctinfo,