netfilter: conntrack: remove extension register api

These no longer register/unregister a meaningful structure so remove it.

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

include/net/netfilter/nf_conntrack_acct.h

···
 
 void nf_conntrack_acct_pernet_init(struct net *net);
 
-int nf_conntrack_acct_init(void);
 void nf_conntrack_acct_fini(void);
 
 #endif /* _NF_CONNTRACK_ACCT_H */

include/net/netfilter/nf_conntrack_ecache.h

···
 void nf_conntrack_ecache_pernet_init(struct net *net);
 void nf_conntrack_ecache_pernet_fini(struct net *net);
 
-int nf_conntrack_ecache_init(void);
-void nf_conntrack_ecache_fini(void);
-
 static inline bool nf_conntrack_ecache_dwork_pending(const struct net *net)
 {
 	return net->ct.ecache_dwork_pending;
···
 static inline void nf_conntrack_ecache_pernet_fini(struct net *net)
 {
 }
-
-static inline int nf_conntrack_ecache_init(void)
-{
-	return 0;
-}
-
-static inline void nf_conntrack_ecache_fini(void)
-{
-}
-
 static inline bool nf_conntrack_ecache_dwork_pending(const struct net *net) { return false; }
 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 #endif /*_NF_CONNTRACK_ECACHE_H*/

include/net/netfilter/nf_conntrack_extend.h

···
 #define nf_ct_ext_find(ext, id)	\
 	((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
 
-/* Destroy all relationships */
-void nf_ct_ext_destroy(struct nf_conn *ct);
-
 /* Add this type, returns pointer to data or NULL. */
 void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
 
-struct nf_ct_ext_type {
-	enum nf_ct_ext_id id;
-};
-
-int nf_ct_extend_register(const struct nf_ct_ext_type *type);
-void nf_ct_extend_unregister(const struct nf_ct_ext_type *type);
 #endif /* _NF_CONNTRACK_EXTEND_H */

include/net/netfilter/nf_conntrack_labels.h

···
 
 #ifdef CONFIG_NF_CONNTRACK_LABELS
 int nf_conntrack_labels_init(void);
-void nf_conntrack_labels_fini(void);
 int nf_connlabels_get(struct net *net, unsigned int bit);
 void nf_connlabels_put(struct net *net);
 #else
-static inline int nf_conntrack_labels_init(void) { return 0; }
-static inline void nf_conntrack_labels_fini(void) {}
 static inline int nf_connlabels_get(struct net *net, unsigned int bit) { return 0; }
 static inline void nf_connlabels_put(struct net *net) {}
 #endif

include/net/netfilter/nf_conntrack_seqadj.h

···
 		     enum ip_conntrack_info ctinfo, unsigned int protoff);
 s32 nf_ct_seq_offset(const struct nf_conn *ct, enum ip_conntrack_dir, u32 seq);
 
-int nf_conntrack_seqadj_init(void);
-void nf_conntrack_seqadj_fini(void);
-
 #endif /* _NF_CONNTRACK_SEQADJ_H */

include/net/netfilter/nf_conntrack_timeout.h

···
 }
 
 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
-int nf_conntrack_timeout_init(void);
-void nf_conntrack_timeout_fini(void);
 void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout);
 int nf_ct_set_timeout(struct net *net, struct nf_conn *ct, u8 l3num, u8 l4num,
 		      const char *timeout_name);
 void nf_ct_destroy_timeout(struct nf_conn *ct);
 #else
-static inline int nf_conntrack_timeout_init(void)
-{
-        return 0;
-}
-
-static inline void nf_conntrack_timeout_fini(void)
-{
-        return;
-}
-
 static inline int nf_ct_set_timeout(struct net *net, struct nf_conn *ct,
 				    u8 l3num, u8 l4num,
 				    const char *timeout_name)

include/net/netfilter/nf_conntrack_timestamp.h

···
 
 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 void nf_conntrack_tstamp_pernet_init(struct net *net);
-
-int nf_conntrack_tstamp_init(void);
-void nf_conntrack_tstamp_fini(void);
 #else
 static inline void nf_conntrack_tstamp_pernet_init(struct net *net) {}
-
-static inline int nf_conntrack_tstamp_init(void)
-{
-	return 0;
-}
-
-static inline void nf_conntrack_tstamp_fini(void)
-{
-	return;
-}
 #endif /* CONFIG_NF_CONNTRACK_TIMESTAMP */
 
 #endif /* _NF_CONNTRACK_TSTAMP_H */

net/netfilter/nf_conntrack_acct.c

···
 module_param_named(acct, nf_ct_acct, bool, 0644);
 MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");
 
-static const struct nf_ct_ext_type acct_extend = {
-	.id	= NF_CT_EXT_ACCT,
-};
-
 void nf_conntrack_acct_pernet_init(struct net *net)
 {
 	net->ct.sysctl_acct = nf_ct_acct;
-}
-
-int nf_conntrack_acct_init(void)
-{
-	int ret = nf_ct_extend_register(&acct_extend);
-	if (ret < 0)
-		pr_err("Unable to register extension\n");
-	return ret;
-}
-
-void nf_conntrack_acct_fini(void)
-{
-	nf_ct_extend_unregister(&acct_extend);
 }

net/netfilter/nf_conntrack_core.c

···
 #include <net/netfilter/nf_conntrack_l4proto.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <net/netfilter/nf_conntrack_helper.h>
-#include <net/netfilter/nf_conntrack_seqadj.h>
 #include <net/netfilter/nf_conntrack_core.h>
 #include <net/netfilter/nf_conntrack_extend.h>
 #include <net/netfilter/nf_conntrack_acct.h>
···
 	kvfree(nf_conntrack_hash);
 
 	nf_conntrack_proto_fini();
-	nf_conntrack_seqadj_fini();
-	nf_conntrack_labels_fini();
 	nf_conntrack_helper_fini();
-	nf_conntrack_timeout_fini();
-	nf_conntrack_ecache_fini();
-	nf_conntrack_tstamp_fini();
-	nf_conntrack_acct_fini();
 	nf_conntrack_expect_fini();
 
 	kmem_cache_destroy(nf_conntrack_cachep);
···
 	if (ret < 0)
 		goto err_expect;
 
-	ret = nf_conntrack_acct_init();
-	if (ret < 0)
-		goto err_acct;
-
-	ret = nf_conntrack_tstamp_init();
-	if (ret < 0)
-		goto err_tstamp;
-
-	ret = nf_conntrack_ecache_init();
-	if (ret < 0)
-		goto err_ecache;
-
-	ret = nf_conntrack_timeout_init();
-	if (ret < 0)
-		goto err_timeout;
-
 	ret = nf_conntrack_helper_init();
 	if (ret < 0)
 		goto err_helper;
-
-	ret = nf_conntrack_labels_init();
-	if (ret < 0)
-		goto err_labels;
-
-	ret = nf_conntrack_seqadj_init();
-	if (ret < 0)
-		goto err_seqadj;
 
 	ret = nf_conntrack_proto_init();
 	if (ret < 0)
···
 	cancel_delayed_work_sync(&conntrack_gc_work.dwork);
 	nf_conntrack_proto_fini();
 err_proto:
-	nf_conntrack_seqadj_fini();
-err_seqadj:
-	nf_conntrack_labels_fini();
-err_labels:
 	nf_conntrack_helper_fini();
 err_helper:
-	nf_conntrack_timeout_fini();
-err_timeout:
-	nf_conntrack_ecache_fini();
-err_ecache:
-	nf_conntrack_tstamp_fini();
-err_tstamp:
-	nf_conntrack_acct_fini();
-err_acct:
 	nf_conntrack_expect_fini();
 err_expect:
 	kmem_cache_destroy(nf_conntrack_cachep);

net/netfilter/nf_conntrack_ecache.c

···
 #define NF_CT_EVENTS_DEFAULT 1
 static int nf_ct_events __read_mostly = NF_CT_EVENTS_DEFAULT;
 
-static const struct nf_ct_ext_type event_extend = {
-	.id	= NF_CT_EXT_ECACHE,
-};
-
 void nf_conntrack_ecache_pernet_init(struct net *net)
 {
 	struct nf_conntrack_net *cnet = nf_ct_pernet(net);
···
 	net->ct.sysctl_events = nf_ct_events;
 	cnet->ct_net = &net->ct;
 	INIT_DELAYED_WORK(&cnet->ecache_dwork, ecache_work);
+
+	BUILD_BUG_ON(__IPCT_MAX >= 16);	/* ctmask, missed use u16 */
 }
 
 void nf_conntrack_ecache_pernet_fini(struct net *net)
···
 	struct nf_conntrack_net *cnet = nf_ct_pernet(net);
 
 	cancel_delayed_work_sync(&cnet->ecache_dwork);
-}
-
-int nf_conntrack_ecache_init(void)
-{
-	int ret = nf_ct_extend_register(&event_extend);
-	if (ret < 0)
-		pr_err("Unable to register event extension\n");
-
-	BUILD_BUG_ON(__IPCT_MAX >= 16);	/* ctmask, missed use u16 */
-
-	return ret;
-}
-
-void nf_conntrack_ecache_fini(void)
-{
-	nf_ct_extend_unregister(&event_extend);
 }

net/netfilter/nf_conntrack_extend.c

···
 #include <net/netfilter/nf_conntrack_act_ct.h>
 #include <net/netfilter/nf_nat.h>
 
-static struct nf_ct_ext_type __rcu *nf_ct_ext_types[NF_CT_EXT_NUM];
-static DEFINE_MUTEX(nf_ct_ext_type_mutex);
 #define NF_CT_EXT_PREALLOC	128u /* conntrack events are on by default */
 
 static const u8 nf_ct_ext_type_len[NF_CT_EXT_NUM] = {
···
 	/* Conntrack must not be confirmed to avoid races on reallocation. */
 	WARN_ON(nf_ct_is_confirmed(ct));
 
+	/* struct nf_ct_ext uses u8 to store offsets/size */
+	BUILD_BUG_ON(total_extension_size() > 255u);
 
 	if (ct->ext) {
 		const struct nf_ct_ext *old = ct->ext;
···
 	return (void *)new + newoff;
 }
 EXPORT_SYMBOL(nf_ct_ext_add);
-
-/* This MUST be called in process context. */
-int nf_ct_extend_register(const struct nf_ct_ext_type *type)
-{
-	int ret = 0;
-
-	/* struct nf_ct_ext uses u8 to store offsets/size */
-	BUILD_BUG_ON(total_extension_size() > 255u);
-
-	mutex_lock(&nf_ct_ext_type_mutex);
-	if (nf_ct_ext_types[type->id]) {
-		ret = -EBUSY;
-		goto out;
-	}
-
-	rcu_assign_pointer(nf_ct_ext_types[type->id], type);
-out:
-	mutex_unlock(&nf_ct_ext_type_mutex);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(nf_ct_extend_register);
-
-/* This MUST be called in process context. */
-void nf_ct_extend_unregister(const struct nf_ct_ext_type *type)
-{
-	mutex_lock(&nf_ct_ext_type_mutex);
-	RCU_INIT_POINTER(nf_ct_ext_types[type->id], NULL);
-	mutex_unlock(&nf_ct_ext_type_mutex);
-	synchronize_rcu();
-}
-EXPORT_SYMBOL_GPL(nf_ct_extend_unregister);

net/netfilter/nf_conntrack_helper.c

···
 }
 EXPORT_SYMBOL_GPL(nf_nat_helper_unregister);
 
-static const struct nf_ct_ext_type helper_extend = {
-	.id	= NF_CT_EXT_HELPER,
-};
-
 void nf_conntrack_helper_pernet_init(struct net *net)
 {
 	struct nf_conntrack_net *cnet = nf_ct_pernet(net);
···
 
 int nf_conntrack_helper_init(void)
 {
-	int ret;
 	nf_ct_helper_hsize = 1; /* gets rounded up to use one page */
 	nf_ct_helper_hash =
 		nf_ct_alloc_hashtable(&nf_ct_helper_hsize, 0);
 	if (!nf_ct_helper_hash)
 		return -ENOMEM;
 
-	ret = nf_ct_extend_register(&helper_extend);
-	if (ret < 0) {
-		pr_err("nf_ct_helper: Unable to register helper extension.\n");
-		goto out_extend;
-	}
-
 	INIT_LIST_HEAD(&nf_ct_nat_helpers);
 	return 0;
-out_extend:
-	kvfree(nf_ct_helper_hash);
-	return ret;
 }
 
 void nf_conntrack_helper_fini(void)
 {
-	nf_ct_extend_unregister(&helper_extend);
 	kvfree(nf_ct_helper_hash);
 }

net/netfilter/nf_conntrack_labels.c

···
 	net->ct.labels_used++;
 	spin_unlock(&nf_connlabels_lock);
 
+	BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE / sizeof(long) >= U8_MAX);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(nf_connlabels_get);
···
 	spin_unlock(&nf_connlabels_lock);
 }
 EXPORT_SYMBOL_GPL(nf_connlabels_put);
-
-static const struct nf_ct_ext_type labels_extend = {
-	.id     = NF_CT_EXT_LABELS,
-};
-
-int nf_conntrack_labels_init(void)
-{
-	BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE / sizeof(long) >= U8_MAX);
-
-	return nf_ct_extend_register(&labels_extend);
-}
-
-void nf_conntrack_labels_fini(void)
-{
-	nf_ct_extend_unregister(&labels_extend);
-}

net/netfilter/nf_conntrack_seqadj.c

···
 		 this_way->offset_after : this_way->offset_before;
 }
 EXPORT_SYMBOL_GPL(nf_ct_seq_offset);
-
-static const struct nf_ct_ext_type nf_ct_seqadj_extend = {
-	.id	= NF_CT_EXT_SEQADJ,
-};
-
-int nf_conntrack_seqadj_init(void)
-{
-	return nf_ct_extend_register(&nf_ct_seqadj_extend);
-}
-
-void nf_conntrack_seqadj_fini(void)
-{
-	nf_ct_extend_unregister(&nf_ct_seqadj_extend);
-}

net/netfilter/nf_conntrack_timeout.c

···
 	rcu_read_unlock();
 }
 EXPORT_SYMBOL_GPL(nf_ct_destroy_timeout);
-
-static const struct nf_ct_ext_type timeout_extend = {
-	.id	= NF_CT_EXT_TIMEOUT,
-};
-
-int nf_conntrack_timeout_init(void)
-{
-	int ret = nf_ct_extend_register(&timeout_extend);
-	if (ret < 0)
-		pr_err("nf_ct_timeout: Unable to register timeout extension.\n");
-	return ret;
-}
-
-void nf_conntrack_timeout_fini(void)
-{
-	nf_ct_extend_unregister(&timeout_extend);
-}

net/netfilter/nf_conntrack_timestamp.c

···
 module_param_named(tstamp, nf_ct_tstamp, bool, 0644);
 MODULE_PARM_DESC(tstamp, "Enable connection tracking flow timestamping.");
 
-static const struct nf_ct_ext_type tstamp_extend = {
-	.id	= NF_CT_EXT_TSTAMP,
-};
-
 void nf_conntrack_tstamp_pernet_init(struct net *net)
 {
 	net->ct.sysctl_tstamp = nf_ct_tstamp;
-}
-
-int nf_conntrack_tstamp_init(void)
-{
-	int ret;
-	ret = nf_ct_extend_register(&tstamp_extend);
-	if (ret < 0)
-		pr_err("Unable to register extension\n");
-	return ret;
-}
-
-void nf_conntrack_tstamp_fini(void)
-{
-	nf_ct_extend_unregister(&tstamp_extend);
 }

net/netfilter/nf_nat_core.c

···
 	return 0;
 }
 
-static struct nf_ct_ext_type nat_extend __read_mostly = {
-	.id		= NF_CT_EXT_NAT,
-};
-
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
 
 #include <linux/netfilter/nfnetlink.h>
···
 	if (!nf_nat_bysource)
 		return -ENOMEM;
 
-	ret = nf_ct_extend_register(&nat_extend);
-	if (ret < 0) {
-		kvfree(nf_nat_bysource);
-		pr_err("Unable to register extension\n");
-		return ret;
-	}
-
 	for (i = 0; i < CONNTRACK_LOCKS; i++)
 		spin_lock_init(&nf_nat_locks[i]);
 
 	ret = register_pernet_subsys(&nat_net_ops);
 	if (ret < 0) {
-		nf_ct_extend_unregister(&nat_extend);
 		kvfree(nf_nat_bysource);
 		return ret;
 	}
···
 
 	nf_ct_iterate_destroy(nf_nat_proto_clean, &clean);
 
-	nf_ct_extend_unregister(&nat_extend);
 	nf_ct_helper_expectfn_unregister(&follow_master_nat);
 	RCU_INIT_POINTER(nf_nat_hook, NULL);
 

net/netfilter/nf_synproxy_core.c

···
 	return 1;
 }
 
-static struct nf_ct_ext_type nf_ct_synproxy_extend __read_mostly = {
-	.id		= NF_CT_EXT_SYNPROXY,
-};
-
 #ifdef CONFIG_PROC_FS
 static void *synproxy_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 {
···
 
 static int __init synproxy_core_init(void)
 {
-	int err;
-
-	err = nf_ct_extend_register(&nf_ct_synproxy_extend);
-	if (err < 0)
-		goto err1;
-
-	err = register_pernet_subsys(&synproxy_net_ops);
-	if (err < 0)
-		goto err2;
-
-	return 0;
-
-err2:
-	nf_ct_extend_unregister(&nf_ct_synproxy_extend);
-err1:
-	return err;
+	return register_pernet_subsys(&synproxy_net_ops);
 }
 
 static void __exit synproxy_core_exit(void)
 {
 	unregister_pernet_subsys(&synproxy_net_ops);
-	nf_ct_extend_unregister(&nf_ct_synproxy_extend);
 }
 
 module_init(synproxy_core_init);

net/sched/act_ct.c

···
 	.automatic_shrinking = true,
 };
 
-static struct nf_ct_ext_type act_ct_extend __read_mostly = {
-	.id		= NF_CT_EXT_ACT_CT,
-};
-
 static struct flow_action_entry *
 tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action)
 {
···
 	if (err)
 		goto err_register;
 
-	err = nf_ct_extend_register(&act_ct_extend);
-	if (err)
-		goto err_register_extend;
-
 	static_branch_inc(&tcf_frag_xmit_count);
 
 	return 0;
 
-err_register_extend:
-	tcf_unregister_action(&act_ct_ops, &ct_net_ops);
 err_register:
 	tcf_ct_flow_tables_uninit();
 err_tbl_init:
···
 static void __exit ct_cleanup_module(void)
 {
 	static_branch_dec(&tcf_frag_xmit_count);
-	nf_ct_extend_unregister(&act_ct_extend);
 	tcf_unregister_action(&act_ct_ops, &ct_net_ops);
 	tcf_ct_flow_tables_uninit();
 	destroy_workqueue(act_ct_wq);